RG30_BSS21353_LTE_system_information_issue_01A_20121102.pdf

GSM/EDGE BSS, Rel. RG30(BSS), Operating Documentation, Issue 02

Feature description

BSS21353: LTE system information DN0937841 Issue 01A Approval Date 2012-11-02 Confidential

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BSS21353: LTE system information

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Table of contents This document has 26 pages. Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1

Introduction to the feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2

Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 3.1

Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Software requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2

Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 4.1

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Functional details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5 5.1 5.2

System impacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Relations to other features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Impacts on interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.3

Impacts on system performance and capacity. . . . . . . . . . . . . . . . . . . . 14

6 6.1

User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.2

MML commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7 7.1

Activating and configuring the feature . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Enabling cell reselection from a GSM cell to a LTE cell and modifying parameters for the priority based cell reselection and/or WCDMA priority 23

7.2

Optimization of the feature by modifying parameters for the priority based cell reselection and/or WCDMA priority . . . . . . . . . . . . . . . . . . . . . . . . . 24 Testing the activation of the feature “LTE system information” . . . . . . . 24 Deactivating the “LTE system information” feature . . . . . . . . . . . . . . . . 25

7.3 7.4 8

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Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 0 – Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26


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List of tables

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Table 1

Software requirements for network elements . . . . . . . . . . . . . . . . . . . . . 9

Table 2 Table 3

Managed object class ADJL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Managed object class BTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19


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Summary of Changes

Summary of Changes Changes between issues 01 A(2012/11/02, RG20(BSS)) and 01(2010/06/14, RG20(BSS)) Introduction to the feature (1) •

Dependency on feature BSS10101 ‘Inter-System Handover’ to support LTE incoming handover has been removed.

Relations to other features (5.1) •

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Dependency on feature BSS10101 ‘Inter-System Handover’ has been updated.

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Summary of Changes

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Introduction to the feature

1 Introduction to the feature The feature BSS21353: “LTE system information” is the first step towards interworking between the 2G and LTE networks. The feature supports autonomous cell reselection from the GSM/EDGE cells to the LTE cells. Information about the LTE cells is sent in the SYSTEM INFORMATION TYPE 2quater (SI2q) message on the BCCH to the mobile station (MS). Instead of the cel l ranking algorithm, a new priority based cell reselection algorithm is introduced for managing the cell reselection to the LTE cells. The operator can add the cell parameters of the neighboring LTE cells into the 2G BSC database via MML. This feature is controlled by an ON/OFF type license key.

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Benefits


2 Benefits Cell reselection from the GSM/EDGE cells to the LTE cells offers means to efficiently establish and deploy a mixed GSM/LTE network. The GSM – LTE interworking allows that LTE can be embedded in an already existing GSM network offering basic mobile services. This featur e allows a smooth movement of LTE into the GSM/EDGE network. The traffic moving to the LTE network releases the GSM resources and leads to improvements in the throughput and delay factors for the MS attached to the 2G network. End users of packet switched services entering an area of LTE cells can gain advantage of the benefits of LTE technology such as high data rates.

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Requirements

3 Requirements 3.1

Software requirements The following software is required for this feature. Network element

BSC

S15 or newer

NetAct

OSS5.2 CD set 3

Table 1

3.2

Required software release

Software requirements for network elements

Hardware requirements LTE and GSM/EDGE compatible MS is required to make use of this feature.

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Functional description


4 Functional description This feature enables cell reselection from GSM cells to LTE cells in a mixed GSM/LTE radio access network. To use this feature, the following information is required about the adjacent LTE cells: •

the frequencies and the bandwidth

•

the cell indices, the country code, the tracking area code, and the network code

•

priorities and lists of barred cells (to give the decision criteria if a cell reselection takes place or not).

To administer this information Adjacent LTE cell (ADJL) object class is introduced to the system. This information is sent via the SYSTEM IN FORMATION TYPE 2quater (SI2q) message on BCCH to the MS. Up to eight adjacent LTE cells may be configured per GSM cell. Priority based cell reselection algorithm is used when LTE neighbors are present in the cell. The following segment level priority parameters are sent as part of the SI2q message to the MS when LTE neighbors are present in the cell: 1.

GSM priority

2.

Priority search threshold

3.

Low priority threshold

4.

Priority based reselection hysteresis

5.

Time hysteresis

When an LTE neighbor cell exists simultaneously with a WCDMA neighbor cell, the segment level priority parameter, WCDMA priority, is used to define the absolute prio rity of the WCDMA neighbor cells. In this case, the priority parameters for the WCDMA cell are sent in SI2q message also.

4.1

Functional details Concept of priority based a lgorithm

New concept of algorithm that is used in this fe ature is based on unambigous cell reselection priority order between different radio access technologies (RATs) without predefined offsets. Direct comparison between signal levels of different RATs is n o longer required. Only minimum signal strength criteria of the neighboring cells are considered for higher priority cells (and also minimum quality criteria in case of the LTE cells). Following 2 cases can be distinguished: Case 1:

When there is at least one m easured non serving cell with higher priority inter-RAT(radio access technology) frequency, the MS reselects to the inter-RAT cell with highest priority among the ones that satisfy the threshold criteria. The threshold criteria that must be satisfied is (RSRP - lteAdjCellMinRxLevel) > lteAdjCellReselectUpperThr where RSRP is Reference Signal Received Power(RSRP) and it is the Linear average of power contribution of specific resource elements, that is the ones that carry the cell specific reference signals in the given measurement bandwidth.

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lteAdjCellMinRxLevel is Minimum RX level for LTE access and lteAdjCellReselectUpperThr is minimum value for cell reselection threshold for adjacent LTE cell having a higher priority than the serving cell. In this case, re-selection cell order is : 1.

priority criteria

2.

threshold criteria

The below diagram depicts an example with the following assumption:lteAdjCellMinRxLevel = -114 dBmlteAdjCellReselectUpperThr = 32 dB

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Below figure describes the reselection defined in case 1.

Case 2:

This case occurs when there are no measured non-serving cells with higher priority inter-RAT frquency for which the conditions related to case 1 are satisfied and for the serving and all measured neighboring GSM cells during time hysteresis, if S_serving < lteAdjCellReselectLowerThr, where lteAdjCellReselectLowerThr is the minimum value for cell reselection threshold for the adjacent LTE cell having a lower priority than the serving cell. time Hysteresis is used define a time hysteresis in priority based cell reselection algorithm in the serving cell.

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Below figure represents the reselection described in case 2

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System impacts


5 System impacts This chapter is divided into the following sections:

5.1

•

“Relations to other features”

•

“Impacts on interfaces”

•

“Impacts on system performance and capacity”

Relations to other features This feature can be used independent of other features.

g

To perform MS handover from LTE to GSM for speech calls LTE can use SRVCC handover procedure. Inter-System Handover (ISHO) must be enabl ed in BSC to support SRVCC handovers (SRVCC handovers are handled and signalled as inter-system handovers in BSC). After call release these LTE originated mobiles can return back to LTE through cell reselection procedure of LTE System Information feature.

5.2

Impacts on interfaces Abis interface

SI2q message in Abis interface is changed to include the LTE related segment level parameters when the feature license of the fe ature “LTE system information” is ON and there exist LTE adjacent cells in the BSC. Below segment level parameters are sent as part of SI2q message to the MS when priority base cell reselection algorithm is used and LTE neighbors are present in the cell: •

GSM priority

•


•


•

Priority based reselection hysteresis

•

Time hysteresis

The segment level priority parameter, WCDMA priority, is used to define the absolute priority of the WCDMA neighbor cells wh en an LTE neighbor cell e xists simultaneously with a WCDMA neighbor cell. This parameter is also sent in SI2q message. NetAct interface

NetAct supports the parameters associated with the feature and also license for the feature.

5.3

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Impacts on system performance and capacity •

Stand-alone Dedicated Control Channel (SDCCH) capacity may be impacted especially at the edge of the LTE coverage (assuming that LTE is given the highest priority)

•

Number of SDCCH attempts may increase in order to perform Location Update when the reselection from LTE to 2G takes place. This leads to po tential increase in: 1.

SDCCH traffic

2.

SDCCH blocking

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•

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System impacts

The Link Access Protocol for D-channel (LAPD) load m ay be impacted especially at the edge of LTE coverage (assuming that LTE is given the highest priority) due to increase of SDCCH traffic.

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User interface


6 User interface 6.1

Parameters The following table shows the new ADJL object parameters implemented for the feature BSS21353 ”LTE system information”.

Parameter name

Command

Description

Range

Default

LTE adjacent cell index

EAN, EAS, EAU With this parameter, you can define the cell index for the adjacent LTE cell. The index is unambiguous under a serving GSM cell.

0 – 254

–

LTE adjacent cell downlink carrier frequency

EAN, EAS, EAU With this paramter, you can define the downlink carrier frequency of the adjacent LTE cell.

0 – 29 649

–

LTE adjacent cell tracking area code

EAN, EAS, EAU With this parameter, you can define the tracking area where the adjacent LTE cell belongs.

0 – 65 535

–

LTE adjacent cell mobile country code

EAN, EAS, EAU With this parameter, you can define the mobile country code number for the adjacent LTE cell.

3 characters

–

LTE adjacent cell mobile network code

EAN, EAS, EAU With this parameter, you can define the mobile network code number for the adjacent LTE cell.

2-3 characters

–

LTE adjacent cell minimum bandwidth

EAN, EAS, EAU With this parameter, you can define the minimum value of the channel bandwidth for a given LTE cell ARFCN.

6 kHz, 15 kHz, 0 25 kHz, 50 kHz, 75 kHz, 100 kHz

Table 2

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Managed object class ADJL

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Parameter name

Command

User interface

Description

Range

Default

LTE adjacent cell priority

EAN, EAS, EAU With this parameter, you can define an absolute priority of the adjacent LTE cell. 0 is the lowest and 7 is the highest priority.

0-7

0

LTE adjacent cell reselection upper threshold

EAN, EAS, EAU With this parameter, you can define a minimum value for cell reselection threshold for adjacent LTE cell having a higher priority than the serving cell.

0..62 dB, step 2 dB

32 dB

LTE adjacent cell reselection lower threshold

EAN, EAS, EAU With this parameter, you can define a minimum value for cell reselection threshold for adjacent LTE cell having a lower priority than the serving cell.

0..62 dB, step 2 dB

32 dB

LTE adjacent cell minimum RX level

EAN, EAS, EAU With this parameter, -140...-78 dB, you can define the step 2 dB minimum RX level for LTE access. The value of this parameter must be exceeded before the MS can make a reselection towards the adjacent LTE cell.

Table 2

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-140 dB

Managed object class ADJL (Cont.)


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User interface

Parameter name


Command

Description

Barred LTE EAN, EAS, EAU With this parameter, adjacent cell list you can define a list with LTE physical layer cell identities (PCIDs). Members of the list are not allowed to make cell reselection.

Range

Default

0-503

–

Bit 0: PCIDs

0

The list contains maximum 16 cells. Barred LTE adjacent cell group

EAN, EAS, EAU With this parameter, you can define a bit pattern (6 bits) where each bit corresponds with the range of PCID values. LTE access is not allowed when the bit is set 1.

0-83 Bit 1: PCIDs 84 - 167 Bit 2: PCIDs 168 - 251 Bit 3: PCIDs 252 - 335 Bit 4: PCIDs 336 - 419 Bit 5: PCIDs 420 - 503

barred LTE adjacent cell pattern

EAN, EAS, EAU With this paramter, you can define a bit pattern which corresponds to the PCIDs most significants bits. The PCID and bit pattern is compared.

barred LTE adjacent cell pattern sense

EAN, EAS, EAU With this parameter, 0 (equal), 1 (not 0 you can define the equal) meaning of the given barred LTE cell pattern and the actual PCID. The given bit pattern is compared either to be equal or not equal with the actual PCID.

Table 2

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0-127

0

Managed object class ADJL (Cont.)


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Parameter name

User interface

Command

Description

Range

Default

activation state

-

With this parameter, 0 (no-plan), you can define the 1 (planned), activation state of the 2 (activated) radio network object.

notification origin

–

This parameter tells 2- 14 characters – the origin of the radio network change. Possible values are: MML, system, Q3, SendToNW, PlanActivation

Table 2

0

Managed object class ADJL (Cont.) The following table shows the new BTS object parameters implemented for the feature BSS21353 ”LTE system information”.

Parameter name

Command

Description

Range

GSM priority

EQM, EQO

With this parameter, you can define an absolute priority of the serving GSM cell. Value 0 is the lowest and value 7 is the highest priority. The value cannot be the same as WCDMA priority.


EQM, EQO

With this parameter, -98...-56 dB, you can define the step 3 dB threshold for the serving cell that controls the measurement of the lower priority interRAT cells or frequencies.

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EQM, EQO

With this parameter, you can define a threshold for the serving cell below which the MS is allowed to reselect to lower priority cells.

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Table 3

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0-7

Default

0...28 dBm, step 2 dBm

7

Managed object class BTS


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User interface

Parameter name


Command

Description

Range

Default

Priority based EQM, EQO reselection hysteresis

With this parameter, you can define a hysteresis in the priority reselection algorithm.

Rule disabled (0), 5 dB (1), 4dB (2), 3 dB (3)

0

Time hysteresis EQM, EQO

With this parameter, you can define a time hysteresis in priority based cell reselection algorithm in the serving cell.

5 sec (0), 10 sec (1), 15 sec (2), 20 sec (3)

1

WCDMA priority

EQM, EQO

With this parameter, you can define an absolute priority of the WCDMA neigbor cells.The value of this parameter cannot be the same as GSM priority.

0-7

6

Utran Threshold Reselection

EQM, EQO

With this parameter you can define Utran Threshold Reselection. Parameter is used by MS in priority-based cell reselection algorithm.

0-62 dB, step 2 dB

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Utran Quality EQM, EQO Rx Level Margin

With this parameter you can define Utran Quality Rx Level Margin. Parameter is used by MS in priority-based cell reselection algorithm.

-119 ..-57dBm

-119

Table 3

step 2 dBm

Managed object class BTS (Cont.)

6.2

MML commands The following MML commands are introduced:

20

•

EAN: Creation of a new LTE adjacent cell.

•

EAS: Deletion of a LTE adjacent cell.

•

EAU: Modification of a LTE adjacent cell.

•

EAV: Printout of a LTE adjacent cell.

•

EQM: To add new BTS parameters.


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User interface

EQO: To output BTS parameters..


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Activating and configuring the feature


7 Activating and configuring the feature This chapter provides the procedure to operate the feature BSS21353 ”LTE system information”.

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7.1


Enabling cell reselection from a GSM cell to a LTE cell and modifying parameters for the priority based cell reselection and/or WCDMA priority This feature can only be activated when the LTE system information license is installed in the BSC.

Check the LTE system information feature state. Set the feature state to “ CONF”. ZW7I:FEA,FULL:FEA=1965;

Create the LTE adjacent cell using the command

Following is an example command: ZEAN:SEG=6:INDEX=0:MCC=210,MNC=214,TAC=7:FREQ=16383;

LTE adjacent cell modification can be done using

Following is an example command: ZEAU:SEG=6::MCC=210,MNC=214,TAC=7,FREQ=16844:NEWFREQ=16844:;

LTE adjacent cell deletion can be done using

Following is an example command: ZEAS:SEG=6:INDEX=0;

Set the feature state to “ON” ZW7M:FEA=1965:ON;

End

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7.2


Optimization of the feature by modifying parameters for the priority based cell reselection and/or WCDMA priority The feature usage can be optimized by setting the priority based cell reselection and/or WCDMA values appropriately.

Modify the new segment level parameters for the priority based cell res election algorithm and/or WCDMA priority

Following is an example command: EQM:BTS=40::::::::GPRIO=4,WPRIO=5,PSTHR= 95,LPTHR=10,HPRIO=2,TIMEH=2;

End

7.3

Testing the activation of the feature “LTE system information” The following methods can be used to verify if the feature is activated:

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•

Check that the feature state is ON.

•

Check that LTE adjacencies are correct in SI2q messages.

•

Check that cell reselection algorithm parameters are correct in SI2q messages.


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7.4


Deactivating the “LTE system information” feature Deactivate by setting the feature state to OFF or CONF ZW7M:FEA=1965:OFF:;

or ZW7M:FEA=1965:CONF:;

When “LTE System Information” feature license expires, the feature state is changed automatically to the “CONF” state. No other special operation is needed to deactivate the ” LTE system information” feature. End

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Abbreviations


8 Abbreviations 0–Z 2G ADJL ARFCN BCCH

adjacent LTE cell absolute radio frequency channel broadcast control channel

BSC

base station controller

BSS

base station system

EDGE E-UTRAN GSM LTE MML MS PCID RX SI2q UMTS UTRAN

26

2nd generation

enhanced data rate for GSM evolution evolved UTRAN global system for mobile communications long term evolution man machine language mobile station physical layer cell identity receiver system information 2quater universal mobile telecommunications system UMTS terrestrial radio access network

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