CPRI Compression(ERAN11.1 04)

eRAN

CPRI Compression Feature Parameter Description Issue

04

Date

2016-11-01

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2016. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks trademarks and trade names mentioned mentioned in this this document are are the property of of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd. Address:

Huawei Industrial Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website:

http://www.huawei.com

Email:

[email protected]

Issue 04 (2016-11-01)

Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

i

Copyright © Huawei Technologies Co., Ltd. 2016. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks trademarks and trade names mentioned mentioned in this this document are are the property of of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd. Address:

Huawei Industrial Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website:

http://www.huawei.com

Email:

[email protected]

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eRAN CPRI Compression Feature Parameter Description

Contents

Contents 1 About This This Document........... Document................................. ............................................ ............................................. ............................................. .................................... .............. 1 1.1 Scope........................................................................................................... Scope....... ....................................................................................................................................................................... ................................................................... 1 1.2 Intended Audience..........................................................................................................................................................1 1.3 Change History................................................................................................... H istory............................................................................................................................................................... ............................................................ 1 1.4 Differences Differences Between eNodeB Types.............................................................................................................................. Types.............................................................................................................................. 4

2 Overview.................. Overview......................................... ............................................. ............................................ ............................................ ............................................ .............................. ........ 5 2.1 Introduction................................................................................................. Introduction.................................................................................................................................................................... ................................................................... 5 2.2 Benefits...........................................................................................................................................................................5 Benefits...........................................................................................................................................................................5

3 CPRI Compression Compression for Macro eNodeBs........ eNodeBs............................... ............................................. ............................................ ...............................7 .........7 3.1 Principles........................................................................................ Principles ........................................................................................................................................................................ ................................................................................ 7 3.2 Cell-Level CPRI Compression....................................................................................................................................... Compression....................................................................................................................................... 7 3.3 Sector-Level Sector-Level CPRI Compression....................................................................................................................................8 3.4 CPRI Com pression Selection......................................................................................................................................... Selection......................................................................................................................................... 9 3.4.1 CPRI Payload Pa yload Bandwidth over an Optical or Electrical CPRI CPRI Port............................................................................ 9 3.4.2 Required Required I/Q Data Bandwidth................................................................................................................................... Bandwidth................................................................................................................................... 11 3.4.3 I/Q Data Bandwidth Data Bandwidth After CPRI Compression..........................................................................................................11 Compression..........................................................................................................11 3.4.4 CPRI Compression C ompression Selection..................................................................... Selection.....................................................................................................................................1 ................................................................11 1

4 CPRI Compression Compression for LampSite eNodeBs......... eNodeBs............................... ............................................ .............................................13 .......................13 4.1 Principles........................................................................................ Principles ...................................................................................................................................................................... .............................................................................. 13 4.2 Cell-Level CPRI Compression..................................................................................................................................... Compression..................................................................................................................................... 14 4.2.1 CPRI Compression C ompression over Optical Ports...................................................................................................................... Ports...................................................................................................................... 14 4.2.2 CPRI Compression C ompression over Electrical P orts................................................................................................. orts...................................................................................................................14 ..................14 4.3 Cell-Level Cell-Leve l CPRI Compression Selection........................................................................................................ Selection..................................................................................................................... ............. 15 4.3.1 CPRI Compression C ompression Selection for Optical Ports.........................................................................................................15 4.3.2 CPRI Compression C ompression Selection for Electrical Ports..................................................................................................... Ports..................................................................................................... 15 4.4 Transparent Transparent Compression........................................................................................................................ Compression............................................................................................................................................. ..................... 17 4.5 Transparent Transparent Compression Selection................................................................... Selection............................................................................................................................. .......................................................... 18

5 Related Features........ Features.............................. ............................................ ............................................. ............................................. ............................................ .......................... ....20 20 6 Network Impact........... Impact.................................. ............................................. ............................................ ............................................ ............................................ ........................ 21 7 Engineering Guidelines............ Guidelines.................................. ............................................ ............................................ ............................................ ............................... ......... 22 7.1 When to Use CPRI CPRI Compression................................................................................................................................. Compression................................................................................................................................. 22 Issue 04 (2016-11-01)


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Contents

7.2 Required Information................................................................................................. Information................................................................................................................................................... .................................................. 25 7.3 Planning........................................................................................................................................................................ Planning........................................................................................................................................................................ 25 7.4 Deployment.............................................................. Deployment.................................................................................................................................................................. .................................................................................................... 25 7.4.1 Requirements............................................................................................................................................................. Requirements............................................................................................................................................................. 25 7.4.2 Precautions............................................................................................. Precautions.................................................................................................................................................................28 ....................................................................28 7.4.3 Data Preparation and Activation................................................................................................................................32 Activation................................................................................................................................32 7.4.3.1 Data Preparation....................................................................................................................... Preparation..................................................................................................................................................... .............................. 32 7.4.3.2 Using the CME....................................................................................................................................................... CME....................................................................................................................................................... 34 7.4.3.3 Using MML Commands.........................................................................................................................................35 7.4.4 Activation Observation..............................................................................................................................................36 7.4.5 Deactivation............................................................................................................................................................... Deactivation...............................................................................................................................................................36 36 7.4.5.1 Using the CME....................................................................................................................................................... CME....................................................................................................................................................... 36 7.4.5.2 Using MML Commands.........................................................................................................................................36 7.5 Performance Monitoring.......................................................................................... Monitoring...............................................................................................................................................37 .....................................................37 7.6 Parameter Optimization................................................................................................................................................ Optimization................................................................................................................................................ 37 7.7 Troubleshooting............................................................................................................................................................ Troubleshooting............................................................................................................................................................ 38

8 Parameters..... Parameters............................ ............................................. ............................................ ............................................ ............................................ .......................................39 .................39 9 Counters.......... Counters................................ ............................................ ............................................ ............................................ ............................................ ...................................... ................ 44 10 Glossary....... Glossary.............................. ............................................. ............................................ ............................................ ............................................ .......................................45 .................45 11 Reference Documents.......... Documents................................ ............................................. ............................................. ............................................ .................................. ............ 46

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1 About This Document

1

About This Document

1.1 Scope This document describes LOFD-001076 CPRI Compression, including its technical principles, related features, features, network impact, impact, and engineering guidelines. guidelines. Any managed objects (MOs), parameters, alarms, or counters described herein correspond to the software release delivered with this document. Any future updates will be described in the product documentation delivered delivered with future software software releases. This document applies only to LTE FDD. Any "LTE" in this document refers to LTE FDD, and "eNodeB" refers to LTE FDD eNodeB. This document applies to the following types of eNodeBs.

eNodeB Type

Model

Macro

3900 series eNodeB

LampSite

DBS3900 LampSite

1.2 Intended Audience This document is intended for personnel who: l l

Need to understand the features described described herein Work with Huawei products

1.3 Change History This section provides information about the changes in different document versions. There are two types of changes: l

Feature change Changes in features and parameters of a specified version as well as the affected entities.

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eRAN CPRI Compression Feature Parameter Description l


Editorial change Changes in wording or addition of information and any related parameters affected by editorial changes. Editorial change does not specify the affected entities.

eRAN11.1 04 (2016-11-01) This issue includes the following changes.

Change Type

Change Description

Parameter Change

Affected Entity

Feature change

Updated hardware supporting CPRI compression. For details, see 7.4.1 Requirements .

None

Macro and LampSite eNodeBs

Editorial change

None

None

-


Change Type

Change Description

Parameter Change

Affected Entity

Feature change

Added the support for the pRRU3916. For details, see 7.4.1 Requirements.

None

LampSite eNodeBs


None


None

None

-

Editorial change


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Change Type

Change Description

Parameter Change

Affected Entity

Feature change

Supported transparent compression by LampSite eNodeBs. For details, see 4.4 Transparent Compression, 4.5 Transparent Compression Selection, and 7 Engineering Guidelines.

Added the EuSectorEqmGroup . SectorGroupLinkCompression parameter.

LampSite eNodeBs

None

-

Supported the UBBPe. For details, see 7.4.1 Requirements and 7.4.2 Precautions . Editorial change

None


Change Type

Change Description

Parameter Change

Affected Entity

Feature change

None

None

N/A

Editorial change

Optimized descriptions about the relationship between the CPRIEX parameter and the CPRI Compression feature. For details, see 7.4.2 Precautions .

None

-

Updated mutually exclusive features. For details, see 5 Related Features.

eRAN11.1 Draft B (2015-12-30) This issue includes the following changes.

Issue 04 (2016-11-01)

Change Type

Change Description

Parameter Change

Affected Entity

Feature change

None

None

N/A

Editorial change

Revised the writing format of 5 Related None Features and 7.4.1 Requirements.


-

3



eRAN11.1 Draft A (2015-12-07) Compared with Issue 04 (2015-11-03) of eRAN8.1, Draft A (2015-12-07) of eRAN11.1 includes the following changes.

Change Type

Change Description

Parameter Change

Affected Entity

Feature change


None


Editorial change

Optimized descriptions in 7 Engineering Guidelines.

None

-

1.4 Differences Between eNodeB Types Feature Support by Macro, Micro, and LampSite eNodeBs Feature ID

Feature Name

Supported by Macro eNodeBs

Supported by Micro eNodeBs

Supported by LampSite eNodeBs

LOFD-001076

CPRI Compression

Yes

No

Yes

Function Implementation in Macro and LampSite eNodeBs Function

Difference

CPRI compression mode

The difference in CPRI compression modes supported by macro and LampSite eNodeBs is as follows: l

Macro eNodeBs support both common CPRI compression and enhanced CPRI compression.

l

LampSite eNodeBs support only common CPRI compression if cell-level CPRI compression over optical ports is used between BBUs and RHUBs.

For details, see related descriptions in the document. Transparent compression

Transparent compression is a function of the enhanced CPRI compression feature, which is supported only by LampSite eNodeBs. For details, see related descriptions in the document.

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2 Overview

2

Overview

2.1 Introduction Complying with common public radio interface (CPRI) protocols, CPRI ports transmit control-plane and user-plane data between a baseband unit (BBU) and remote radio units (RRUs)/radio frequency units (RFUs) of macro eNodeBs or between a BBU/pRRU and an RRU HUB (RHUB) of LampSite eNodeBs. (pRRU refers to pico remote radio unit.) User plane data is in-phase/quadrature (I/Q) data and consumes a large amount of CPRI bandwidth resources in each cell. To support more carriers or RRUs/RFUs/pRRUs on a CPRI port, the CPRI Compression feature is introduced. This feature compresses the I/Q bit width and lowers the sampling rate to reduce the CPRI bandwidth resources required by CPRI data transmission.

2.2 Benefits CPRI compression is applied when CPRI bandwidth is insufficient. CPRI compression provides the following benefits with CPRI bandwidth held constant: l

Extends carrier or RRU/RFU/pRRU specifications, as shown in Figure 2-1. Figure 2-1 Extending carrier specifications (using a macro eNodeB as an example)

l

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Reduces the CPRI optical fibers or the CPRI Ethernet cables (only for LampSite eNodeBs), thereby reducing capital expenditure (CAPEX), as shown in Figure 2-2 and Figure 2-3.


5


2 Overview

Figure 2-2 Reducing CPRI optical fibers (using a macro eNodeB as an example)

Figure 2-3 Reducing CPRI Ethernet cables (only for LampSite eNodeBs)

The compression ratio specifies the ratio of bandwidth occupied by uncompressed data to bandwidth occupied by compressed data. The following table lists the compression ratios used by common and enhanced CPRI compression for different cell bandwidths.

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Cell Band widt h

Compr ession Ratio Suppo rted by Comm on CPRI Compr ession

Compression Ratio Supported by Enhanced CPRI Compression

Compression Ratio Supported by Cell-Level CPRI Compression over Electrical Ports Between RHUBs and pRRUs on LampSite eNodeBs

Compression Ratio Supported by Transparent Compression of LampSite eNodeBs

20 MHz

2:1

3:1

2:1, 3:1, and 4:1

3:1 and 4:1

15 MHz

2:1

3:1

2:1, 3:1, and 4:1

3:1 and 4:1

10 MHz

3:2

2:1

2:1 and 4:1

Not supported

5 MHz

3:2

Not supported

2:1

Not supported


6


3 CPRI Compression for Macro eNodeBs

3

CPRI Compression for Macro eNodeBs

3.1 Principles CPRI compression applies to cells with the bandwidths of 20 MHz/15 MHz/10 MHz/5 MHz. CPRI compression is implemented separately for the uplink and downlink. l

l

In the downlink, a BBU uses the CPRI compression algorithm to compress I/Q data. The BBU transforms the data into CPRI frames and transmits these frames to an RRU/RFU through optical fibers or electrical cables. Upon receiving these frames, the RRU/RFU transforms them into compressed I/Q data, decompresses the data, and then transmits the decompressed I/Q data to the downlink IF/RF module of the RRU. IF is short for intermediate frequency. In the uplink, the compression principle is similar. The RF module performs CPRI compression and framing, and then sends the CPRI frames to the BBU. The BBU performs CPRI deframing and decompression.

Figure 3-1 illustrates uplink and downlink CPRI compression for macro eNodeBs. Figure 3-1 Uplink and downlink CPRI compression for Macro eNodeBs

3.2 Cell-Level CPRI Compression CELL.CPRICompression specifies the CPRI compression mode used in a cell. l

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If this parameter is set to NO_COMPRESSION(No Compression), the cell carrier does not perform CPRI compression. The 1T1R I/Q data bandwidth is l isted in the 1T1R I/Q Data Bandwidth Without CPRI Compression column of Table 3-1. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

7



l

If this parameter is set to NORMAL_COMPRESSION(Normal Compression), the cell carrier performs common CPRI compression. The 1T1R I/Q data bandwidth after common CPRI compression is enabled is listed in the 1T1R I/Q Data Bandwidth After Common CPRI Compression Is Enabled column of Table 3-1.

l

If this parameter is set to ENHANCED_COMPRESSION(Enhanced Compression), the cell carrier performs enhanced CPRI compression. The 1T1R I/Q data bandwidth after enhanced CPRI compression is ena bled is listed in the 1T1R I/Q Data Bandwidth After Enhanced CPRI Compression Is Enabled column of Table 3-1. NOTE

CELL.CPRICompression is valid for single frequency network (SFN) cells only if eUCellSectorEqm. SectorCpriCompression is set to NULL(Invalid). For details, see 3.3 Sector-Level CPRI Compression.

Table 3-1 LTE 1T1R I/Q data bandwidth

Cell Bandwidth

1T1R I/Q Data Bandwidth Without CPRI Compression

1T1R I/Q Data Bandwidth After Common CPRI Compression Is Enabled

1T1R I/Q Data Bandwidth After Enhanced CPRI Compression Is Enabled

20 MHz

921.6 Mbit/s

460.8 Mbit/s

307.2 Mbit/s

15 MHz

921.6 Mbit/s

460.8 Mbit/s

307.2 Mbit/s

10 MHz

460.8 Mbit/s

307.2 Mbit/s

230.4 Mbit/s

5 MHz

230.4 Mbit/s

153.6 Mbit/s

Not supported

3.3 Sector-Level CPRI Compression eUCellSectorEqm .SectorCpriCompression specifies the sector-level CPRI compression mode. eUCellSectorEqm .SectorCpriCompression and CELL.CPRICompression jointly determines the CPRI compression mode in an SFN cell. l

l

l

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If eUCellSectorEqm. SectorCpriCompression is set to NO_COMPRESSION(No Compression) , the sector equipment carrier does not perform CPRI compression. The 1T1R I/Q data bandwidth is listed in the 1T1R I/Q Data Bandwidth Without CPRI Compression column of Table 3-1 in 3.2 Cell-Level CPRI Compression. If eUCellSectorEqm. SectorCpriCompression is set to NORMAL_COMPRESSION(Normal Compression), the sector equipment carrier performs common CPRI compression. The 1T1R I/Q data bandwidth after common CPRI compression is enabled is listed in the 1T1R I/Q Data Bandwidth After Common CPRI Compression Is Enabled column of Table 3-1 in 3.2 Cell-Level CPRI Compression. If eUCellSectorEqm. SectorCpriCompression is set to ENHANCED_COMPRESSION(Enhanced Compression) , the sector equipment carrier performs enhanced CPRI compression. The 1T1R I/Q data bandwidth after enhanced CPRI compression is enabled is listed in the 1T1R I/Q Data Bandwidth After Enhanced CPRI Compression Is Enabled column of Table 3-1 in 3.2 CellLevel CPRI Compression. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

8



If eUCellSectorEqm. SectorCpriCompression is set to NULL(Invalid), sector-level CPRI compression becomes ineffective. In this case, the CPRI compression mode is controlled by CELL.CPRICompression. For details, see 3.2 Cell-Level CPRI Compression.

Figure 3-2 provides an example of CPRI compression. l

Cell 1: It is a non-SFN cell whose CELL.CPRICompression is NORMAL_COMPRESSION(Normal Compression). Therefore, the cell carrier uses common CPRI compression.

l

Cell 2: It is an SFN cell whose CELL.CPRICompression is ENHANCED_COMPRESSION(Enhanced Compression) . eUCellSectorEqm. SectorCpriCompression is set to NULL(Invalid) for sector equipment 1 on RRU 2 and NORMAL_COMPRESSION(Normal Compression) for sector equipment 2 on RRU 3. Therefore, the carrier of sector equipment 1 uses enhanced CPRI compression and the carrier of sector equipment 2 uses common CPRI compression.

Figure 3-2 Example of CPRI compression

3.4 CPRI Compression Selection Calculate the following bandwidths before enabling CPRI compression: 1.

CPRI payload bandwidth over an optical or electrical CPRI port

2.

Required I/Q data bandwidth

3.

I/Q data bandwidth after CPRI compression is enabled

The following details how to calculate these bandwidths.

3.4.1 CPRI Payload Bandwidth over an Optical or Electrical CPRI Port The CPRI payload bandwidth over an optical CPRI port is calculated using the following formula: CPRI payload bandwidth over an optical CPRI port = CPRI bandwidth x (15/16) x (4/5) = 0.75 x CPRI bandwidth Issue 04 (2016-11-01)


9



where l

l

The CPRI bandwidth equals the negotiated CPRI line rate. As defined in section 4.2.7 of the CPRI Specification V5.0 released in September 2011, the CPRI bandwidth can be 2.4576 Gbit/s, 4.9152 Gbit/s, 6.144 Gbit/s, or 9.8304 Gbit/s. 15/16 is the CPRI-protocol-defined ratio of the I/Q data bandwidth to the total CPRI bandwidth. Figure 3-3 shows the structure of a basic frame at the CPRI l ine rate 2.4576 Gbit/s. The leftmost part is reserved for the control word. The remaining 15 parts are occupied by the I/Q data. Therefore, the ratio of the I/Q data bandwidth to the total CPRI bandwidth is 15/16. Figure 3-3 Structure of a basic frame at the CPRI line rate 2.4576 Gbit/s

l

4/5 is the 8B/10B coding efficiency factor. In 8B/10B coding scheme, an 8-bit payload data is converted to a 10-bit code for transmission.

Table 3-2 lists the mapping between CPRI bandwidths and CPRI payload bandwidths over a CPRI port. Issue 04 (2016-11-01)


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Table 3-2 Mapping between CPRI bandwidths and CPRI payload bandwidths over a CPRI port CPRI Bandwidth

2.4576 Gbit/s

4.9152 Gbit/s

6.144 Gbit/s

9.8304 Gbit/s

CPRI Payload Bandwidth

1.8432 Gbit/s

3.6864 Gbit/s

4.608 Gbit/s

7.3728 Gbit/s

3.4.2 Required I/Q Data Bandwidth The required I/Q data bandwidth between the BBU and RRUs/RFUs is calculated using the following formula: Required I/Q data bandwidth = Number of antennas x 1T1R I/Q data bandwidth x Number of cells over a CPRI chain where l

The number of antennas is the greater one between the number of transmit antennas and the number of receive antennas for each cell. For example, the number of antennas is 2 for a 2T2R cell and 4 for a 2T4R cell.

l

The 1T1R I/Q data bandwidth depends on cell bandwidths, and is listed in the 1T1R I/Q Data Bandwidth Without CPRI Compression column of 3.2 Cell-Level CPRI Compression.

l

The num ber of cells over a CPRI chain equals the total number of cells over a CPRI chain.

3.4.3 I/Q Data Bandwidth After CPRI Compression After CPRI compression is enabled, the I/Q data bandwidth required between the BBU and RRU/RFU is calculated in the same way as that described in 3.4.2 Required I/Q Data Bandwidth. The 1T1R I/Q data bandwidth decreases after CPRI compression is enabled. Therefore, the I/Q data bandwidth required between the BBU and RRU/RFU also decreases. Table 3-1 lists the 1T1R I/Q data bandwidths after common and enhanced CPRI compression are enabled.

3.4.4 CPRI Compression Selection Calculate and compare the following bandwidths before determining whether to enable CPRI compression (common CPRI compression or enhanced CPRI compression): 1.

CPRI payload bandwidth over a CPRI port

2.

Required I/Q data bandwidth

3.

I/Q data bandwidth after common CPRI compression

4.

I/Q data bandwidth after enhanced CPRI compression

Select the CPRI compression mode based on the comparison result. l

1 ≥ 2: No CPRI compression is required.

l

1< 2 and 1≥3: Select common CPRI compression.

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l

1 < 2 and 3 > 1 ≥ 4: Select enhanced CPRI compression.

l

1 < 4: Replan the CPRI bandwidth.

The following provides an example of CPRI compression selection. When three 20 MHz 2T2R RRUs are cascaded over a CPRI chain and each RRU carries a single cell, the I/Q data bandwidth required in normal situations is 5.5296 Gbit/s (921.6 × 2 × 3). If common CPRI compression is enabled, the required I/Q data bandwidth is 2.7648 Gbit/s (460.8 × 2 × 3). If enhanced CPRI compression is enabled, the required data bandwidth is 1.8432 Gbit/s (307.2 × 2 × 3). l

If the CPRI bandwidth is 9.8304 Gbit/s, the CPRI payload bandwidth is 7.3728 Gbit/s, which is greater than the I/Q data bandwidth 5.5296 Gbit/s. In this situation, CPRI compression is not required.

l

If the CPRI bandwidth is 6.144 Gbit/s, the CPRI payload bandwidth is 4.608 Gbit/s, which is less than the I/Q data bandwidth 5.5296 Gbit/s and greater than the I/Q data bandwidth after common CPRI compression is enabled, 2.7648 Gbit/s. In this situation, common CPRI compression is selected.

l

If the CPRI bandwidth is 2.4576 Gbit/s, the CPRI payload bandwidth is 1.8432 Gbit/s. In this situation, enhanced CPRI compression is selected.

As indicated in the example, common and enhanced CPRI compression can reduce the CPRI bandwidth required in a 20 MHz cell by 50% and 67%, respectively. You can calculate the CPRI compression effect based on actual conditions.

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4 CPRI Compression for LampSite eNodeBs

4

CPRI Compression for LampSite eNodeBs

4.1 Principles CPRI compression is implemented separately for the uplink and downlink and consists of two phases. l

In the downlink, the first phase uses optical port-based transmission from the BBU to the RHUB and the second phase uses electrical port-based transmission from the RHUB to pRRUs. In the first phase, the BBU compresses the I/Q data using the CPRI compression algorithm, performs CPRI framing, and then sends the CPRI frames to the RHUB over optical fibers. In the second phase, the RHUB compresses the received CPRI frames and then sends them to the pRRUs over Ethernet cables. Upon receiving the CPRI frames from the RHUB, the pRRUs perform CPRI deframing and decompression, and then send the decompressed I/Q data to the downlink RF/IF module.

l

In the uplink, the compression principle is similar. In the first phase, the pRRUs perform CPRI compression and framing, and then send the CPRI frames to the RHUB. In the second phase, the RHUB compresses the received CPRI frames and then sends them to the BBU.

The first and second phases can have the same or different CPRI compression ratios, in the uplink or downlink. Figure 4-1 illustrates uplink and downlink CPRI compression for LampSite eNodeBs.

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Figure 4-1 Uplink and downlink CPRI compression for LampSite eNodeBs

LampSite eNodeBs only su pport cell-level CPRI compression and transparent CPRI transmission and do not support sector-level CPRI compression. NOTE

In transparent CPRI transmission, the RHUB does not compress or decompress data but transparently transmits I/Q data.

4.2 Cell-Level CPRI Compression 4.2.1 CPRI Compression over Optical Ports CELL.CPRICompression specifies the CPRI compression mode between optical ports on the BBUs and RHUBs. The parameter can be set to NO_COMPRESSION(No Compression) or NORMAL_COMPRESSION(Normal Compression). For details, see 3.2 Cell-Level CPRI Compression. NOTE

Optical ports on LampSite eNodeBs support cell-level common CPRI compression only and do not support cell-level enhanced CPRI compression. In a LampSite eNodeB, the rate over the optical ports between a BBU and an RHUB can be 4.9152 Gbit/s or 9.8304 Gbit/s.

4.2.2 CPRI Compression over Electrical Ports CELL.CpriEthCompressionRatio specifies the CPRI compression ratio and reflects the CPRI compression mode between electrical ports on the RHUBs and pRRUs. The parameter can be set to 2_TO_1(2:1 Compression), 3_TO_1(3:1 Compression), or 4_TO_1(4:1 Compression) , indicating that the CPRI data bandwidth between RHUBs and pRRUs can be compressed in a compression ratio of 2:1, 3:1, or 4:1. Table 4-1 lists the 1T1R data bandwidths after CPRI compression is enabled. Issue 04 (2016-11-01)


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Table 4-1 LTE 1T1R I/Q data bandwidth

Cell Bandwid th

1T1R I/Q Data Bandwidth Without CPRI Compression

1T1R I/Q Data Bandwidth After Compression Is Enabled (2:1 Compression Ratio)



20 MHz

921.6 Mbit/s

460.8 Mbit/s

307.2 Mbit/s

230.4 Mbit/s

15 MHz

921.6 Mbit/s

460.8 Mbit/s

307.2 Mbit/s

230.4 Mbit/s

10 MHz

460.8 Mbit/s

230.4 Mbit/s

Not supported

138.24 Mbit/s

5 MHz

230.4 Mbit/s

115.2 Mbit/s

Not supported

Not supported

CELL.CPRICompression and CELL.CpriEthCompressionRatio are independent of each other.

4.3 Cell-Level CPRI Compression Selection 4.3.1 CPRI Compression Selection for Optical Ports The method for selecting CPRI compression modes over optical ports of LampSite eNodeBs is similar to that for selecting CPRI compression modes for macro eNodeBs. No CPRI compression or common CPRI compression can be selected. For details, see 3.4 CPRI Compression Selection.

4.3.2 CPRI Compression Selection for Electrical Ports By default, CPRI compression is enabled for electrical ports in a compression ratio of 2:1. If a cell supports multiple compression ratios, determine the candidate compression ratios based on the cell bandwidth. l

20 MHz or 15 MHz Select a compression ratio of 2:1, 3:1, or 4:1.

l

10 MHz Select a compression ratio of 2:1 or 4:1.

l

5 MHz Select a compression ratio of 2:1.

Then, calculate and compare the following bandwidths: 1.

Remaining CPRI payload bandwidth over an electrical port Remaining CPRI payload bandwidth over the electrical port = CPRI payload bandwidth supported by the electrical port – I/Q data bandwidths occupied by cells of other radio access technologies where

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15



–

CPRI payload bandwidth supported by the electrical port is calculated in the same way as that for macro eNodeBs. For details, see 3.4.1 CPRI Payload Bandwidth over an Optical or Electrical CPRI Port . The CPRI bandwidth over the electrical port is 1.2288 Gbit/s. You can also query the CPRI payload bandwidth over the electrical port from Table 4-2.

–

I/Q data bandwidths occupied by cells of other radio access technologies are listed in Table 4-3.

2.

I/Q CPRI data bandwidth after CPRI compression in the default compression ratio of 2:1. For details, see Table 4-1 in 4.2.2 CPRI Compression over Electrical Ports.

3.

I/Q CPRI data bandwidth after CPRI compression in a compression ratio of 3:1. For details, see Table 4-1 in 4.2.2 CPRI Compression over Electrical Ports.

4.

I/Q CPRI data bandwidth after CPRI compression in a compression ratio of 4:1. For details, see Table 4-1 in 4.2.2 CPRI Compression over Electrical Ports.

Determine the target compression ratio based on the bandwidth comparison result. l

1 ≥ 2: Select the compression ratio of 2:1.

l

2 > 1 ≥ 3: Select the compression ratio of 3:1.

l

3 > 1 ≥ 4: Select the compression ratio of 4:1.

l

4 > 1: When this happens, the remaining bandwidth is insufficient for LTE cells even if the compression ratio of 4:1 is selected. Therefore, deploy two Ethernet cables between RHUBs and pRRUs.

Table 4-2 Mapping between CPRI bandwidths and CPRI payload bandwidths over an electrical port CPRI Bandwidth

1.2288 Gbit/s


921.6 Mbit/s

Table 4-3 1T1R I/Q data bandwidths occupied by cells of other radio access technologies

Cell Bandwidth

UMTS 1T1R I/Q Data Bandwidth

LTE TDD 1T1R I/Q Data Bandwidth (2:1)



20 MHz

N/A

460.8 Mbit/s

307.2 Mbit/s

230.4 Mbit/s

15 MHz

N/A

460.8 Mbit/s

307.2 Mbit/s

230.4 Mbit/s

10 MHz

N/A

230.4 Mbit/s

Not supported

138.24 Mbit/s

5 MHz

69.12 Mbit/s

115.2 Mbit/s

Not supported

Not supported

The following provides an example of CPRI compression selection. When one 20 MHz 2T2R LTE FDD cell and one 5 MHz 1T2R UMTS cell are configured on an electrical port: Issue 04 (2016-11-01)


16



l

If the default compression ratio 2:1 is used, the I/Q data bandwidth required by the LTE FDD cell is 921.6 Mbit/s (460.8 Mbit/s x 2) based on Table 4-1. The remaining CPRI payload bandwidth per electrical port is 783.36 Mbit/s (921.6 Mbit/s – 69.12 Mbit/s × 2) based on Table 4-2 and Table 4-3. In this situation, the remaining CPRI payload bandwidth is insufficient for the LTE FDD cell, and therefore two Ethernet cables are required between the RHUB and pRRU.

l

If the compression ratio 3:1 is used, the I/Q data bandwidth required by the LTE FDD cell is 614.4 Mbit/s (307.2 Mbit/s x 2) based on Table 4-1. The remaining CPRI payload bandwidth per electrical port is 783.36 Mbit/s (921.6 Mbit/s – 69.12 Mbit/s × 2) based on Table 4-2 and Table 4-3. In this situation, the remaining CPRI payload bandwidth is sufficient for the LTE FDD cell, and therefore only one Ethernet cable is required between the RHUB and pRRU.

As indicated in the example, a higher compression ratio for CPRI compression over the electrical port produces a better compression effect. If t he default compression ratio 2:1 cannot meet the bandwidth requirements, use the compression ratio 3:1 or 4:1 so that the remaining CPRI payload bandwidth can meet the required I/Q data bandwidth. In this way, only one Ethernet cable is required between the RHUB and pRRU, thereby reducing network deployment costs.

4.4 Transparent Compression When a Lam pSite eNodeB uses transparent compression (short for transparent transmission cell-sector equipment group compression), each sector equipment group contains only one sector equipment and optical and electrical ports use the same type of CPRI compression, which is controlled by EuSectorEqmGroup . SectorGroupLinkCompression. Table 4-4 shows the I/Q data bandwidth required for 1T1R transmission after the data on a carrier of a sector equipment group is compressed over optical and electrical ports when EuSectorEqmGroup . SectorGroupLinkCompression is set to NORMAL_3 _TO_1_COMPRESSION or NORMAL_4_TO_1_COMPRESSION .

When EuSectorEqmGroup . SectorGroupLinkCompression is set to NULL, transparent compression is not used. For details about CPRI compression mode over optical and electrical ports, see 4.2.1 CPRI Compression over Optical Ports and 4.2.2 CPRI Compression over Electrical Ports. Table 4-4 LTE I/Q data bandwidth required for 1T1R transmission

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Carrier Bandwidth



20 MHz

307.2 Mbit/s

230.4 Mbit/s

15 MHz

307.2 Mbit/s

230.4 Mbit/s

10 MHz

Not supported

Not supported

5 MHz

Not supported

Not supported


17



4.5 Transparent Compression Selection If EuSectorEqmGroup . SectorGroupLinkCompression retains the default value NULL, transparent compression does not take effect. Determine the compression ratio for cells whose bandwidth is 20 MHz or 15 MHz as follows: 1.

Remaining CPRI payload bandwidth over an electrical port Remaining CPRI payload bandwidth over the electrical port = CPRI payload bandwidth supported by the electrical port – I/Q data bandwidths occupied by cells of other radio access technologies (RATs)

2.

–

CPRI payload bandwidth supported by the electrical port is calculated in the same way as that for macro eNodeBs. For details, see 3.4.1 CPRI Payload Bandwidth over an Optical or Electrical CPRI Port . When the CPRI bandwidth over the electrical port is 1.2288 Gbit/s, query the CPRI payload bandwidth over the electr ical port from Table 4-5.

–

I/Q data bandwidths occupied by cells of other RATs are listed in Table 4-6.

Remaining CPR I payload bandwidth over an optical port Remaining CPR I payload bandwidth over the optical port = CPRI payload bandwidth supported by the optical port – I/Q data bandwidths occupied by cells of other RATs

–

CPRI payload bandwidth supported by the optical port is calculated in the same way as that for macr o eNodeBs. For details, see 3.4.1 CPRI Payload Bandwidth over an Optical or Electrical CPRI Port .

–

I/Q data bandwidths occupied by cells of other RATs are listed in Table 4-6.

3.

I/Q CPRI data bandwidth after CPRI compression in a compression ratio of 3:1. For details, see Table 4-4 in 4.4 Transparent Compression.

4.

I/Q CPRI data bandwidth after CPRI compression in a compression ratio of 4:1. For details, see Table 4-4 in 4.4 Transparent Compression.

If 1 ≥ 3 and 2 ≥ 3, the 3:1 compression ratio is used. If 3 > 1 ≥ 4 and 2 ≥ 4, the 4:1 compression ratio is used. If 3 > 2 ≥ 4 and 1 ≥ 4, the 4:1 compression ratio is used. If 4 > 1, the remaining bandwidth over the electrical port is insufficient for LTE cells even if the 4:1 compression ratio is used. Deploy two Ethernet cables between RHUBs and pRR Us. If 4 > 2, the remaining bandwidth over the optical por t is insufficient for LTE cells even if the 4:1 compression ratio is used. Change the rate of the optical fibers. If the rate of the optical fiber is already 9.8304 Gbit/s, adjust the compression ratio of other carriers. Table 4-5 Mapping between CPRI bandwidths and CPRI payload bandwidths over an electrical port

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CPRI Bandwidth

1.2288 Gbit/s


921.6 Mbit/s


18



Table 4-6 1T1R I/Q data bandwidths occupied by cells of other radio access technologies

Cell Bandwidth

UMTS 1T1R I/Q Data Bandwidth




20 MHz

N/A

460.8 Mbit/s

307.2 Mbit/s

230.4 Mbit/s

15 MHz

N/A

460.8 Mbit/s

307.2 Mbit/s

230.4 Mbit/s

10 MHz

N/A

230.4 Mbit/s

Not supported

138.24 Mbit/s

5 MHz

69.12 Mbit/s

115.2 Mbit/s

Not supported

Not supported

The following provides an example of CPRI compression selection. Assume that the optical port connects to RRUs configured with two LTE FDD 20 MHz 2T2R cells. The remaining CPRI payload bandwidth over each electrical port and over each optical port are 921.6 Mbit/s and 7372.8 Mbit/s, respectively, which are obtained by referring to 1 and 2. l

If the 3:1 compression ratio is used, the I/Q data bandwidth required by the LTE cells is 1228.8 Mbit/s (307.2 Mbit/s × 2 × 2) based on Table 4-4 in 4.4 Transparent Compression. Therefore, the remaining CPRI payload bandwidth over each electrical port is insufficient.

l

If the 4:1 compression ratio is used, the I/Q data bandwidth required by the LTE cells is 921.6 Mbit/s (230.4 Mbit/s × 2 × 2) based on Table 4-4 in 4.4 Transparent Compression. Therefore, the remaining CPRI payload bandwidth over each electrical port is sufficient for the LTE cells.

As indicated in the example, a higher compression ratio for CPRI compression over the electrical port yields a better compression effect. Use the 4:1 compression ratio if possible so that the remaining CPRI payload bandwidth can meet the required I/Q data bandwidth, thereby eliminating the need to deploy an additional Ethernet cable between the RHUB and the pRRU.

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5 Related Features

5

Related Features

Prerequisite Features None

Mutually Exclusive Features Feature ID

Feature Name

Description

LOFD-001031

Extended CP

CPRI Compression requires normal CPs and does not support extended CPs.

MRFD-090202

GSM and LTE FDD Dynamic Spectrum Sharing(LTE FDD)

-

MRFD-111401

GSM and LTE Zero Bufferzone

-

Impacted Features Feature ID

Feature Name

Description

LOFD-003029

SFN

l

l

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When cell-level CPRI compression is activated in an SFN cell, all sectors of the SFN cell must support the CPRI compression mode. When each sector equipment and their baseband processing boards serving an SFN cell have different CPRI compression capabilities, eUCellSectorEqm . SectorCpriCompression can be set based on the CPRI compression capabilities of sector equipment.


20


6 Network Impact

6

Network Impact

System Capacity None

Network Performance CPRI compression impacts the network performance as follows: l

In the uplink, the signal to interference plus noise ratio (SINR) decreases slightly when interference is strong.

l

In the downlink, CPRI compression has little i mpact on the SINR.

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7 Engineering Guidelines

7

Engineering Guidelines

7.1 When to Use CPRI Compression When to Use CPRI Compression for Macro eNodeBs and Cell-Level CPRI Compression for Optical Ports of LampSite eNodeBs For details about how to determine whether to enable CPRI compression and whether to enable common CPRI compression or enhanced CPRI compression on macro eNodeBs, see 3.4.4 CPRI Compression Selection. Table 7-1 provides the scenarios where CPRI compression should be enabled. Table 7-1 Scenarios where CPRI compression should be enabled

Cell Bandwidth

TX/RX Mode of Cells

Number of Cells over a CPRI Chain

CPRI Line Rate (Gbit/s)

20 MHz/15 MHz

1T1R

>4

4.9152

>2

2.4576

>4

9.8304

>2

4.9152

>2

9.8304

>1

4.9152

>1

9.8304

1

4.9152

>8

4.9152

>4

2.4576

>8

9.8304

2T2R/1T2R

4T4R/2T4R

2T8R

10 MHz

1T1R

2T2R/1T2R

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22


Cell Bandwidth

TX/RX Mode of Cells

4T4R/2T4R

2T8R

5 MHz

1T1R

2T2R

4T4R/2T4R

2T8R


Number of Cells over a CPRI Chain

CPRI Line Rate (Gbit/s)

>4

4.9152

>4

9.8304

>2

4.9152

>2

9.8304

>1

4.9152

> 16

4.9152

>8

2.4576

> 16

9.8304

>8

4.9152

>8

9.8304

>4

4.9152

>4

9.8304

>2

4.9152

NOTE

The number of cells over a chain listed in the preceding table is calculated based only on the CPRI bandwidth and CPRI compression mode. The actual cascading capability supported by the eNodeB is associated with RRU capabilities. For details about CPRI port specifications of RRUs, see RRU technical specifications in 3900 Series Base Station Technical Description .

Recommended Cell-Level CPRI Compression Ratio of Electrical Ports on LampSite eNodeBs For details, see 4.3.2 CPRI Compression Selection for Electrical Ports . Table 7-2 lists the number of Ethernet cables required for electrical ports on the RHUB and pRRU when different CPRI compression ratios are used in typical scenarios.

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Table 7-2 Number of Ethernet cables required when different compression ratios are used

LTE Compression Ratio

2:1 (5 MHz/10 MHz/15 MHz/20 MHz)

l

3:1 (15 MHz/20 MHz)

l

2:1 (5 MHz)

UMTS

LTE Carrier 1

(1T2R)

(2T2R)

LTE Carrier 2 (2T2R)

Num ber of Ether net Cable s

-

5 MHz/10 MHz/15 MHz/20 MHz

-

1

-

5 MHz/10 MHz

5 MHz/10 MHz

1

5 MHz/10 MHz

5 MHz/10 MHz

-

1

5 MHz/10 MHz

5 MHz

5 MHz

1

5 MHz

5 MHz

10 MHz

1

10 MHz

10 MHz

20 MHz/15 MHz

2

-

20 MHz/15 MHz

5 MHz

1

5 MHz/10 MHz

20 MHz/15 MHz

-

1

5 MHz/10 MHz

20 MHz/15 MHz

20 MHz/15 MHz

2

l

4:1 (10 MHz/15 MHz/20 MHz)

-

20 MHz/15 MHz

10 MHz/15 MHz/20 MHz

1

l

2:1 (5 MHz)

5 MHz/10 MHz

10 MHz

10 MHz

1

5 MHz

5 MHz/10 MHz

20 MHz/15 MHz

1

Recommended Transparent Compression Ratio for LampSite eNodeBs For details, see 4.5 Transparent Compression Selection. Table 7-3 lists the number of Ethernet cables required for electrical ports on the RHUB and pRRU when different CPRI compression ratios are used in typical scenarios. Table 7-3 Ethernet cables required by transparent compression for LampSite eNodeBs

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LTE Compressio n Ratio

UMTS (1T2R)



Number of Ethernet Cables

3:1 (15 MHz/20 MHz)

-

15 MHz/20 MHz

15 MHz/20 MHz

2


24


LTE Compressio n Ratio

4:1 (15 MHz/20 MHz)


UMTS (1T2R)



Number of Ethernet Cables

5 MHz/10 MHz

15 MHz/20 MHz

-

1

5 MHz/10 MHz

15 MHz/20 MHz

15 MHz/20 MHz

2

-

15 MHz/20 MHz

15 MHz/20 MHz

1

5 MHz/10 MHz

15 MHz/20 MHz

15 MHz/20 MHz

2

7.2 Required Information Collect the following information to calculate the total required CPRI payload bandwidth over an optical or electrical port and I/Q data bandwidth: l

CPRI line rate over an optical or electrical port

l

Cell bandwidth

l

Number of antennas

l

Number of cells on a CPRI port

7.3 Planning None

7.4 Deployment 7.4.1 Requirements Other Features For details, see 5 Related Features.

Hardware The following table provides hardware requirements for common and enhanced CPRI compression.

Issue 04 (2016-11-01)


25



Hardwar Common CPRI Compression e Type

Enhanced CPRI Compression

Baseband processin g board

LBBPd, UBBPd, UBBPe, UMDU

UBBPd, UBBPe, UMDU

RRU/RF U

MRFUd, MRFUc, MRFUe, MRFU V6, LRFUe, RRU3952, RRU3962, RRU3962d, RRU3964, RRU3953, RRU3959, RRU3229, RRU3260, RRU3268, RRU3281, RRU3935, RRU3841, RRU3832, RRU3261, RRU3838, RRU3928, RRU3929, RRU3932, RRU3936, RRU3938, RRU3939, RRU3942, RRU3961, RRU3262, RRU3269, RRU3959w, RRU3952m, RRU3958, RRU3965, RRU3965d, RRU3220E, RRU3230E, RRU3930E, RRU3971

MRFUc, MRFU V6, LRFUe, RRU3952, RRU3953, RRU3959, RRU3262, RRU3269, RRU3268, RRU3281, RRU3952m, RRU3962d, RRU3964, RRU3965, RRU3965d, RRU3261, RRU3959w, RRU3962, RRU3958, RRU3971, RRU3230E, RRU3930E

AAU

AAU3920, AAU3940

AAU3920, AAU3940

RHUB

RHUB3908

None

The following table provides hardware requirements for CPRI compression over electrical ports between the RHUB and pRRU of LampSite eNodeBs.

Hard ware Type

2:1 Compression Ratio



pRRU

pRRU3901, pRRU3902, pRRU3907, pRRU3911, pRRU3916



RHUB

RHUB3908

RHUB3908

RHUB3908

The following table provides hardware requirements for transparent compression of LampSite eNodeBs.

Issue 04 (2016-11-01)


26



Hardwa re Type



Baseband processin g board

UBBPd, UBBPe

UBBPd, UBBPe

pRRU

pRRU3911, pRRU3916

pRRU3911, pRRU3916

RHUB

RHUB3908

RHUB3908

License The operator has purchased and activated the license for the feature listed in the following table.

Feature ID

Feature Name

Model

License Control Item

NE

Sales Unit

LOFD-0010 76

CPRI Compressi on

LT1S00CPRI00

CPRI Compression (per Cell) (FDD)

eNodeB

per cell

NOTE

For LampSite eNodeBs, only cell-level CPRI compression over optical ports is under license control and cell-level CPRI compression over electrical ports is not under license control. Transparent compression of LampSite eNodeBs is not under license control.

Other Requirements The following table provides cell bandwidth requirements.

Issue 04 (2016-11-01)

Cell Bandw idth

Comm on CPRI Compr ession

Enhan ced CPRI Comp ressio n

2:1 Compressi on Ratio on Electrical Ports between RHUB and pRRU on LampSite eNodeBs

20 MHz

Support ed

Suppor Supported ted

3:1 Compress ion Ratio on Electrical Ports between RHUB and pRRU on LampSite eNodeBs


3:1/4:1 Compressio n Ratio (Transparen t Compressio n) for LampSite eNodeBs

Supported

Supported

Supported


27


Cell Bandw idth

Comm on CPRI Compr ession

Enhan ced CPRI Comp ressio n

15 MHz

Support ed

10 MHz 5 MHz



3:1 Compress ion Ratio on Electrical Ports between RHUB and pRRU on LampSite eNodeBs


3:1/4:1 Compressio n Ratio (Transparen t Compressio n) for LampSite eNodeBs


Supported

Supported

Supported

Support ed


Not supported

Supported

Not supported

Support ed

Not support ed

Not supported

Not supported

Not supported

Supported

7.4.2 Precautions l

l

If CPRI compression-related parameters are set or modified in an activated cell, the cell will be reactivated and services will be interrupted. Before changing the value of this parameter for cells served by RRUs in the same RRU chain or ring, ensure that all cells served by the RRU chain or ring are deactivated. Activate the cells after you change the parameter value. When a UBBPd/UBBPe is used: Macro eNodeBs:

–

The CPRI compression modes can be different for RRUs over a CPRI chain. For example, CPRI compression can be enabled for one RRU but disabled for another RRU. Figure 7-1 shows an example. Figure 7-1 Example

–

Issue 04 (2016-11-01)

If an RRU serves multiple cells and supports enhanced CPRI compression, the CPRI compression modes can be different for cells served by the RRU. Specifically, common CPRI compression, enhanced CPRI compression, or no compression can be used by each cell. If the RRU does not support enhanced CPRI compression, the CPRI compression modes must be the same for all cells served by the RRU. Figure 7-2 shows an example. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

28



Figure 7-2 Example

LampSite eNodeBs:

–

The cell-level CPRI compression modes over optical ports can be different for cells over a CPRI chain. Specifically, CPRI compression can be enabled in one cell but disabled in another cell. Figure 7-3 shows an example. Figure 7-3 Example

–

The transparent compression modes can be different for sector equipment groups over a CPRI chain. Specifically, a CPRI chain supports CPRI compression in a compression ratio of 3:1 or 4:1 for each sector equipment group. Figure 7-4 shows an example. Figure 7-4 Example

–

Issue 04 (2016-11-01)

The CPRI compression modes can be different over a CPRI chain. Specifically, a CPRI chain supports cell-level CPRI compression over optical ports and transparent compression. Figure 7-5 shows an example.


29



Figure 7-5 Example

–

If a pRRU is configured with multiple cells, the cell-level CPRI compression modes over electrical ports can be different for cells over a CPRI chain. Specifically, if the bandwidth is unlimited, a CPRI chain supports CPRI compression in a compression ratio of 2:1, 3:1, or 4:1 for each cell. Figure 7-6 shows an example. Figure 7-6 Example

–

If a pRRU is configured with multiple sector equipment groups, the transparent compression modes can be different for sector equipment groups over a CPRI chain. Specifically, if the bandwidth is unlimited, a CPRI chain supports transparent compression in a compression ratio of 3:1 or 4:1 for each sector equipment group. Figure 7-7 shows an example. Figure 7-7 Example

–

Issue 04 (2016-11-01)

The CPRI compression modes can be different over an Ethernet cable between an RHUB and a pRRU. Specifically, an Ethernet cable supports cell-level CPRI Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

30



compression over electrical ports and transparent compression. Figure 7-8 shows an example. Figure 7-8 Example

l

When an LBBPd is used: Macro eNodeBs:

–

If the CPRI bandwidth is less than or equal to 6.144 Gbit/s, the CPRI compression modes can be different for RRUs over a CPRI chain. Specifically, common CPRI compression or no CPRI compression can be used by each RRU. If the CPRI bandwidth is 9.8304 Gbit/s, the CPRI com pression modes must be the same for all RRUs over the CPRI chain. Figure 7-9 shows an example. Figure 7-9 Example

–

If an RRU serves multiple cells, the CPRI compression modes must be the same for all cells served by the RRU. Figure 7-10 shows an example. Figure 7-10 Example

Issue 04 (2016-11-01)

–

When the CPRI Compression feature is enabled, set CPRIEX to ON(On) if the bandwidth required by a CPRI chain after CPRI compression is greater than 6.144 GHz and the CPRI bandwidth (that is, the negotiated line rate of the CPRI chain) is 9.8 GHz.

–

If CPRIEX is set to ON(On) , CPRI compression must be enabled for all the cells over the CPRI chain and only CPRI ports 0, 1, and 2 can be used. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

31



NOTE

You can run the MOD BBP and LST BBP commands to modify and query the value of CPRIEX, respectively.

LampSite eNodeBs:

–

If the CPRI bandwidth is greater than 4.9152 Gbit/s, the cell-level CPRI compression modes over optical ports can be different for cells over a CPRI chain. Specifically, CPRI compression can be enabled in one cell but disabled in another cell. Figure 7-11 shows an example. Figure 7-11 Example

–

If the CPRI bandwidth is greater than 9.8304 Gbit/s, the cell-level CPRI compression modes over optical ports must be the same for all cells over a CPRI chain. Figure 7-12 shows an example. Figure 7-12 Example

–

If CPRIEX is set to ON(On) , cell-level CPRI compression over optical ports must be enabled for all the cells on the CPRI chain and only CPRI ports 0, 1, and 2 can be used. NOTE

You can run the MOD BBP and LST BBP commands to modify and query the value of CPRIEX, respectively.

7.4.3 Data Preparation and Activation 7.4.3.1 Data Preparation The following table lists the parameters that must be set in the CELL MO to enable cell-level CPRI compression. Issue 04 (2016-11-01)


32



Paramete r Name

Parameter ID

Setting Notes

CPRI Compressi on

CELL.CPRIC ompression

l

To enable common CPRI compression, set this parameter to NORMAL_COMPRESSION(Normal Compression) .

l

To enable enhanced CPRI compression, set this parameter to ENHANCED_COMPRESSION(Enhan ced Compression).

CPRI Ethernet Compressi on Ratio

CELL.CpriEt hCompression Ratio

l

To disable CPRI compression, set this parameter to NO_COMPRESSION(No Compression) .

l

To enable CPRI compression over an electrical port in the default compression ratio of 2:1, do not set this parameter.

l

To enable CPRI compression over an electrical port in the compression ratio of 3:1, set this parameter to 3_TO_1(3:1 Compression) .

l

To enable CPRI compression over an electrical port in the compression ratio of 4:1, set this parameter to 4_TO_1(4:1 Compression) .

Data Source Network plan

Network plan

(Optional) The following table describes the parameter that must be set in the eUCellSectorEqm MO to configure sector-level CPRI compression in SFN scenarios.

Issue 04 (2016-11-01)


33


Paramete r Name

Parameter ID

Sector

eUCellSector Eqm. CPRI SectorCpriCo Compressi mpression on


Setting Notes l

To enable common CPRI compression for a sector, set this parameter to NORMAL_COMPRESSION(Normal Compression) .

l

To enable enhanced CPRI compression for a sector, set this parameter to ENHANCED_COMPRESSION(Enhanc ed Compression).

l

To disable CPRI compression for a sector, set this parameter to NO_COMPRESSION(No Compression).

l

If sector-level CPRI compression is not required, set this parameter to NULL(Invalid). In this situation, the CELL.CPRICompression parameter controls whether to enable CPRI compression.


The following table lists the parameters that must be set in the EuSectorEqmGroup MO to enable transparent compression for LampSite eNodeBs.

Paramete r Name

Parameter ID

Setting Notes

Sector Group Carrier PassThrou gh Compressi on

EuSectorEq mGroup. Sect orGroupLink Compression

l

If the compression ratio is 3:1, set this parameter to NORMAL_3_TO_1_COMPRESSION(N ORMAL_3_TO_1_COMPRESSION) .

l

If the compression ratio is 4:1, set this parameter to NORMAL_4_TO_1_COMPRESSION(N ORMAL_4_TO_1_COMPRESSION) .

l

To disable transparent compression, set this parameter to NULL(NULL) . In this situation, the CELL.CPRICompression parameter specifies the CPRI compression mode.


7.4.3.2 Using the CME For detailed operations, see CME-based Feature Configuration.

Issue 04 (2016-11-01)


34



7.4.3.3 Using MML Commands NOTE

Parameter values in the following examples are used for reference only. For live network configurations, such parameters must be configured based on operators' conditions.

MML Commands Scenario 1: Macro eNodeBs l

Activating cell-level CPRI compression Run the MOD CELL command with CPRI Compression set to NORMAL_COMPRESSION(Normal Compression) or ENHANCED_COMPRESSION(Enhanced Compression) .

l

Activating sector-level CPRI compression in SFN scenarios Run the MOD EUCELLSECTOREQM command with Sector CPRI Compression set to NORMAL_COMPRESSION(Normal Compression) or ENHANCED_COMPRESSION(Enhanced Compression) .

Scenario 2: LampSite eNodeBs l

Activating cell-level CPRI compression Run the MOD CELL command to configure cell information.

l

–

Set CPRI Compression to NORMAL_COMPRESSION(Normal Compression) to configure CPRI compression for an optical port.

–

Set CPRI Ethernet Compression Ratio to 2_TO_1(2:1 Compression), 3_TO_1(3:1 Compression), or 4_TO_1(4:1 Compression) to configure CPRI compression for an electrical port.

Activating transparent compression Run the MOD EUSECTOREQMGROUP command with Sector Group Carrier PassThrough Compression set to NORMAL_3_TO_1_COMPRESSION(NORMAL_3_TO_1_COMPRESSION) or NORMAL_4_TO_1_COMPRESSION(NORMAL_4_TO_1_COMPRESSION) .

MML Command Examples Scenario 1: Macro eNodeBs

//Activating common CPRI compression for a cell MOD

CELL:LOCALCELLID=0,CPRICOMPRESSION=NORMAL_COMPRESSION;

//Activating enhanced CPRI compression for a cell MOD

CELL:LOCALCELLID=0,CPRICOMPRESSION=ENHANCED_COMPRESSION;

//Activating common CPRI compression for a sector in an SFN cell MOD EUCELLSECTOREQM:LOCALCELLID=0,SECTOREQMID=0,SECTORCPRICOMPRESSION=NORMAL_COMPRESSI ON;

//Activating enhanced CPRI compression for a sector in an SFN cell MOD EUCELLSECTOREQM:LOCALCELLID=0,SECTOREQMID=0,SECTORCPRICOMPRESSION=ENHANCED_COMPRES SION;

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Scenario 2: LampSite eNodeBs

//Activating common CPRI compression over an electrical port in the compression ratio of 3:1 MOD CELL: LocalCellId=0, MultiRruCellFlag=BOOLEAN_TRUE, MultiRruCellMode=MPRU_AGGREGATION, CpriEthCompressionRatio=3_TO_1, CPRICompression=NORMAL_COMPRESSION;

//Activating transparent compression in a compression ratio of 4:1 MOD EUSECTOREQMGROUP: LocalCellId=0, SectorEqmGroupId=0, SectorGroupLinkCompression=NORMAL_4_TO_1_COMPRESSION;

7.4.4 Activation Observation Perform the following steps to check whether CPRI compression for macro eNodeBs and cell-level CPRI compression for LampSite eNodeBs have been activated and taken effect:

Step 1 Run the LST CELL command to query the value of CPRI Compression. If the value is NORMAL_COMPRESSION(Normal Compression) or ENHANCED_COMPRESSION(Enhanced Compression) , CPRI compression takes effect. For LampSite eNodeBs, you also need to query the value of CPRI Ethernet Compression Ratio. If the value equals the planned value, CPRI compression takes effect.

Step 2 Run the DSP CELL command to query the value of Reason for latest state change. If the value is Cell setup successfully, CPRI compression takes effect. ----End

Perform the following steps to check whether transparent compression has been activated and taken effect for LampSite eNodeBs:

Step 1 Run the DSP CELL command to query the value of Reason for latest state change. If the value is Cell setup successfully, CPRI compression takes effect.

Step 2 Run the LST EuSectorEqmGroup command to query the value of Sector Group Carrier PassThrough Compression. If the value equals the planned value, CPRI compression takes effect. ----End

7.4.5 Deactivation 7.4.5.1 Using the CME For detailed operations, see CME-based Feature Configuration.

7.4.5.2 Using MML Commands MML Commands Scenario 1: Macro eNodeBs l

Deactivating CPRI compression for a cell Run the MOD CELL command with the CPRI Compression parameter set to NO_COMPRESSION(No Compression).

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In SFN cells:

–

To deactivate CPRI compression for a sector, run the MOD EUCELLSECTOREQM command with the Sector CPRI Compression parameter set to NO_COMPRESSION(No Compression).

–

To make the CPRI compression mode of a sector ineffective, run the MOD EUCELLSECTOREQM command with the Sector CPRI Compression parameter set to NULL(Invalid). In this situation, the CPRI compression mode is determined by CPRI Compression.

Scenario 2: LampSite eNodeBs l

Deactivating CPRI compression for a cell To deactivate CPRI compression over an optical port, run the MOD CELL command with the CPRI Compression parameter set to NO_COMPRESSION(No Compression) .

l

Deactivating transparent compression Run the MOD EUSECTOREQMGROUP command with Sector Group Carrier PassThrough Compression set to NULL(NULL) .

MML Command Examples Scenario 1: Macro eNodeBs

//Deactivating CPRI compression for a cell MOD

CELL:LOCALCELLID=0,CPRICOMPRESSION=NO_COMPRESSION;

//Deactivating CPRI compression for a sector in an SFN cell MOD EUCELLSECTOREQM:LOCALCELLID=0,SECTOREQMID=0,SECTORCPRICOMPRESSION=NO_COMPRESSION;

//Making the CPRI compression mode ineffective by sector equipment in an SFN cell MOD

EUCELLSECTOREQM:LOCALCELLID=0,SECTOREQMID=0,SECTORCPRICOMPRESSION=NULL;

Scenario 2: LampSite eNodeBs

//Deactivating CPRI compression for an optical port MOD

CELL:LOCALCELLID=0,CPRICOMPRESSION=NO_COMPRESSION;

//Deactivating transparent compression MOD EUSECTOREQMGROUP: LocalCellId=0, SectorEqmGroupId=0, SectorGroupLinkCompression=NULL;

7.5 Performance Monitoring None

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7.7 Troubleshooting The following table describes the possible causes and solutions for a failure to activate CPRI compression.

Possible Cause

Solution

An extended CP is used in the cells.

l l

The capacity of the license for CPRI compression is insufficient.

Do not use the extended CP. Change the extended CP to the normal CP by running the following command: Run the MOD CELL command with both Uplink cyclic prefix length and Downlink cyclic prefix length set to NORMAL_CP(Normal).

Purchase and install the license.

NOTE You can run the DSP LICINFO command to query license information.

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The CPRI compression mode differs among all cells over a CPRI chain.

Run the DSP CPRILBR command to query the value of Current head line bit rate and check that CPRI compression configuration meet the configuration restrictions in 7.4.2 Precautions .

The RRU/RFU/BBP does not support CPRI compression.

Replace the RRU/RFU/BBP with a new one that supports CPRI compression. For details, see 7.4.1 Requirements.


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8 Parameters

8

Parameters

Table 8-1 Parameters

MO

Parame ter ID

MML Feature Comma ID nd

Feature Name

EuSecto rEqmGr oup

SectorG roupLin kCompr ession

ADD EUSEC TOREQ MGRO UP

LOFD-0 01076 / TDLOF D-00107 6

CPRI Compre ssion

MOD EUSEC TOREQ MGRO UP

TDLOF D-08121 4

LST EUSEC TOREQ MGRO UP

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Description

Meaning: Indicates the compression type on CPRI over optical fibers and CPRI over Ethernet cables for the sector equipment group. This parameter applies to Enhance LampSite eNodeBs where both optical fibers and Ethernet cables are used for RRU cascading and the d CPRI Compre compression ratio on CPRI over optical fibers and that on CPRI over Ethernet cables are the same. This ssion parameter is used to specify the compression ratio on both CPRI over optical fibers and CPRI over Ethernet cables. With the same compression ratio on CPRI over optical fibers and CPRI over Ethernet cables, the number of cells on a single CPRI link in a LampSite eNodeB is increased without changing the data rate over the CPRI. This parameter can be set to NORMAL_3_TO_1_COMPRESSION(NORMAL_3_ TO_1_COMPRESSION), NORMAL_4_TO_1_COMPRESSION(NORMAL_4_ TO_1_COMPRESSION), or NULL. NORMAL_3_TO_1_COMPRESSION indicates a standard compression ratio of 3:1. NORMAL_4_TO_1_COMPRESSION indicates a standard compression ratio of 4:1. NULL indicates that the parameter is invalid. The default value is NULL. Only UBBPd and UBBPe boards support the compression. When this parameter is modified, the cell served by the sector equipment group is automatically activated. When this parameter is set to NULL, the CPRI compression type for the sector equipment group is determined by the value of the CPRICompression parameter in the Cell MO. When this parameter is set to any other value, the CPRI


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MO

Parame ter ID


Feature Name

8 Parameters

Description

compression type for the sector equipment group is determined by the value of the SectorGroupCpriCom pression parameter. GUI Value Range: NORMAL_3_TO_1_COMPRESSION(NORMAL_3_ TO_1_COMPRESSION), NORMAL_4_TO_1_COMPRESSION(NORMAL_4_ TO_1_COMPRESSION), NULL(NULL) Unit: None Actual Value Range: NORMAL_3_TO_1_COMPRESSION, NORMAL_4_TO_1_COMPRESSION, NULL Default Value: NULL(NULL)

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MO

Parame ter ID


Feature Name

Cell

CPRICo mpressi on

ADD CELL

CPRI Compre ssion

MOD CELL LST CELL

LOFD-0 01076 / TDLOF D-00107 6 TDLOF D-08121 4

8 Parameters

Description

Meaning: Indicates the common public radio interface (CPRI) compression type. CPRI compression is used in RRU cascading scenarios to enable more RRUs to Enhance be cascaded without changing the CPRI data rate. The d CPRI parameter value NO_COMPRESSION indicates that Compre CPRI compression is not used. The parameter value NORMAL_COMPRESSION indicates that CPRI ssion compression is used. The parameter value ENHANCED_COMPRESSION indicates that enhanced CPRI compression is used. If the eNodeB is equipped with LBBPd boards and the CPRI data rate is 9.8 Gbit/s for LTE FDD cells or the CPRI data rate is greater than 4.9 Gbit/s for LTE TDD cells, the CPRI compression type of cells served by RRUs in the same RRU chain or ring must be the same. The LBBPc does not support CPRI compression, all LBBP boards do not support enhanced CPRI compression. Before changing the value of this parameter for a cell served RRUs in the same RRU chain or ring, ensure that all cells served by the RRU chain or ring are deactivated. Activate the cells after you change the parameter value. GUI Value Range: NO_COMPRESSION(No Compression), NORMAL_COMPRESSION(Normal Compression), ENHANCED_COMPRESSION(Enhanced Compression) Unit: None Actual Value Range: NO_COMPRESSION, NORMAL_COMPRESSION, ENHANCED_COMPRESSION Default Value: NO_COMPRESSION(No Compression)

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8 Parameters

MO

Parame ter ID


Feature Name

Description

eUCellS ectorEq m

SectorC priComp ression

ADD EUCEL LSECT OREQ M

LOFD-0 01076 / TDLOF D-00107 6

CPRI Compre ssion

Meaning:

MOD EUCEL LSECT OREQ M

TDLOF D-08121 4

LST EUCEL LSECT OREQ M

Indicates the common public radio interface (CPRI) compression type for the sector equipment. CPRI Enhance compression is used in RRU cascading scenarios to d CPRI enable more RRUs to be cascaded without changing Compre the CPRI data rate. The parameter value ssion NO_COMPRESSION indicates that CPRI compression is not used. The parameter value NORMAL_COMPRESSION indicates that CPRI compression is used. The parameter value ENHANCED_COMPRESSION indicates that enhanced CPRI compression is used. The parameter value NULL indicates that this parameter is invalid. The performance of enhanced CPRI compression is better than the performance of normal CPRI compression. If the eNodeB is equipped with LBBPd boards and the CPRI data rate is 9.8 Gbit/s for LTE FDD cells or the CPRI data rate is greater than 4.9 Gbit/s for LTE TDD cells, the CPRI compression t ype of cells served by RRUs in the same RRU chain or ring must be the same. Before changing the value of this parameter for a cell served RRUs in the same RRU chain or ring, ensure that all cells served by the RRU chain or ring are deactivated. Activate the cells after you change the parameter value. This parameter is used only when MultiRruCellMode is set to SFN or CELL_COMBINATION. This parameter can be set based on the sector equipment. When this parameter is set to NULL, the CPRI compression type of carriers depends on the value of the CPRICompression parameter in the Cell MO. When this parameter is set to any other value, the sector CPRI compression type of carriers depends on the value of the SectorCpriCompression parameter in the eUCellSectorEqm MO. GUI Value Range: NO_COMPRESSION(No Compression), NORMAL_COMPRESSION(Normal Compression), ENHANCED_COMPRESSION(Enhanced Compression), NULL(Invalid) Unit: None Actual Value Range: NO_COMPRESSION, NORMAL_COMPRESSION, ENHANCED_COMPRESSION, NULL Default Value: NULL(Invalid)

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8 Parameters

MO

Parame ter ID


Feature Name

Description

Cell

CpriEth Compre ssionRat io

ADD CELL

None

Meaning: Indicates the compression ratio of data transmitted on the CPRI port over Ethernet for an MPRU aggregation cell. Data compression on the CPRI port over Ethernet reduces the bandwidth of LTE data on the Ethernet cable between the RHUB and MPRUs, and therefore the Ethernet cable supports more carriers of different RATs. The parameter values 2_TO_1, 3_TO_1, and 4_TO_1 indicate ratios of 2:1, 3:1, and 4:1 respectively.

MOD CELL LST CELL

None

GUI Value Range: 2_TO_1(2:1 Compression), 3_TO_1(3:1 Compression), 4_TO_1(4:1 Compression) Unit: None Actual Value Range: 2_TO_1, 3_TO_1, 4_TO_1 Default Value: 2_TO_1(2:1 Compression)

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9 Counters

9

Counters

There are no specific counters associated with this feature.

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10 Glossary

10

Glossary

For the acronyms, abbreviations, terms, and definitions, see Glossary.

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CPRI Compression(ERAN11.1 04)

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