Hsupa Tti Selection

WCDMA RAN

HSUPA TTI Selection Feature Parameter Description

Copyright © Huawei Technologies Co., Ltd. 2011. 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 Technologies Co., Ltd.

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

WCDMA RAN HSUPA TTI Selection

Contents

Contents 1 Introduction

................................................................................................................................ 1-1

1.1 Scope ............................................................................................................................................ 1-1 1.2 Intended Audience ........................................................................................................................ 1-1 1.3 Change History.............................................................................................................................. 1-1

2 Overview of HSUPA TTI Selection ........................................................................................2-1 3 Technical Description

..............................................................................................................3-1

3.1 TTI Selection During Service Setup or Reconfiguration ............................................................... 3-1 3.2 Dynamic TTI Adjustment ............................................................................................................... 3-2 3.2.1 Overview............................................................................................................................... 3-2 3.2.2 Dynamic TTI Adjustment for a Single Voice Service over HSUPA ....................................... 3-2 3.2.3 Dynamic TTI Adjustment for a Single BE Service over HSUPA ........................................... 3-3 3.2.4 Dynamic TTI Adjustment for a Service Combination over HSUPA ...................................... 3-3

4 Parameters

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5 Counters

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6 Glossary

......................................................................................................................................6-1

7 Reference Documents

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

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1 Introduction

1 Introduction 1.1 Scope This document describes the high-speed uplink packet access (HSUPA) transmission time interval (TTI) selection feature. It covers both the TTI selection during service setup or reconfiguration and the dynamic TTI adjustment, and furthermore provides parameter descriptions.

1.2 Intended Audience This document is intended for: 

Personnel who are familiar with WCDMA basics



Personnel who need to understand HSUPA TTI selection



Personnel who work with Huawei products

1.3 Change History This section provides information on the changes in different document versions. There are two types of changes, which are defined as follows: 

Feature change: refers to the change in the HSUPA TTI selection feature.



Editorial change: refers to the change in wording or the addition of the information that was not described in the earlier version.

Document Issues The document issues are as follows: 

01 (2011-04-30)



Draft B (2011-03-30)



Draft A (2010-12-30)

01 (2011-04-30) This is the document for the first commercial release of RAN13.0. Compared with issue Draft B (2011-03-30) of RAN13.0, this issue has no change.

Draft B (2011-03-30) This is the draft of the document for RAN13.0. Compared with issue Draft A (2010-12-30) of RAN13.0, this issue opt imizes the description.

Draft A (2010-12-30) This is the draft of the document for RAN13.0. Compared with issue 01 (2010-03-30) of RAN12.0, this issue optimizes the description.

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2 Overview of HSUPA TTI Selection

2 Overview of HSUPA TTI Selection The TTI for a service over HSUPA can be 2 ms or 10 ms. When the TTI is 2 ms, higher throughput can be achieved. When the TTI is 10 ms, wider coverage can be achieved. The HSUPA TTI selection feature can change the TTI from 2 ms to 10 ms for wider coverage or from 10 ms to 2 ms for higher throughput. In this way, call drops are reduced and the quality of service (QoS) is ensured. The HSUPA TTI selection feature provides the following functions: 



Sets the TTI according to a configured TTI selection strategy when an HSUPA service is set up or reconfigured. For details, see section 3.1 "TTI Selection During Service Setup or Reconfiguration." Adjusts the TTI for the HSUPA service based on the coverage situation: − Adjusts

the TTI to 10 ms for wider coverage when the UE is on the edge of the cell.

− Adjusts

the TTI to 2 ms for higher throughput when the UE is in the center of the cell. Note that the TTI of a voice service cannot be adjusted from 10 ms to 2 ms.

For details, see section 3.2 "Dynamic TTI Adjustment."

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3 Technical Description

3 Technical Description 3.1 TTI Selection During Service Setup or Reconfiguration The TTI for a service over HSUPA can be set to 2 ms or 10 ms. When the service is set up or reconfigured, the RNC determines the TTI according to the rules listed in Table 3-1. Table 3-1 TTI selection during service setup or reconfiguration Service Type

TTI Setting

CS voice service

The TTI is set to 2 ms if all the following conditions are met: 





Both the UE and the NodeB support the 2 ms TTI. The MAP_HSUPA_TTI_2MS_SWITCH subparameter of the M a p S w i t c h parameter is set to ON. The CSVoiceHsupaTti parameter is set to EDCH_TTI_2ms.

If one of the conditions is not met, the TTI is set to 10 ms. PS voice service


Both the UE and the NodeB support the 2 ms TTI.



The MAP_HSUPA_TTI_2MS_SWITCH subparameter of the M a p S w i t c h parameter is set to ON.



The V o i p H s u p a T t i parameter is set to EDCH_TTI_2ms.

If one of the conditions is not met, the TTI is set to 10 ms. PS streaming service






Both the UE and the NodeB support the 2 ms TTI. The MAP_HSUPA_TTI_2MS_SWITCH subparameter of the M a p S w i t c h parameter is set to ON. The maximum bit rate (MBR) is higher than or equal to the value of S t r e a m H s u p a 2 m s T t i R a t e T h s .

If one of the conditions is not met, the TTI is set to 10 ms. PS BE service (interactive or background service)




Both the UE and the NodeB support the 2 ms TTI. The MAP_HSUPA_TTI_2MS_SWITCH subparameter of the M a p S w i t c h parameter is set to ON.



The cell is not congested.



The MBR is higher than or equal to the value of B e H s u p a 2 m s T t i R a t e T h s .

If one of the conditions is not met, the TTI is set to 10 ms.

Each service in a service combination is a ssigned a TTI during service setup or reconfiguration. The service combination is assigned the 2 ms TTI as long as one service in the combination is assigned the 2 ms TTI. Otherwise, the service combination is assigned the 10 ms TTI.

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3.2 Dynamic TTI Adjustment 3.2.1 Overview Dynamic TTI adjustment is applicable to a single voice service, single BE service, or service combination that includes the voice service or BE service over HSUPA. Table 3-2 describes the dynamic TTI adjustment switches. Table 3-2 Dynamic TTI adjustment switches Parameter

Switch

Description

D r a S w i t c h DRA_VOICE_TTI_RECFG_SWITCH This is a dynamic TTI adjustment switch for the voice

service over HSUPA. When it is set to ON, the TTI can be adjusted from 2 ms to 10 ms. For details, see section 3.2.2 "Dynamic TTI Adjustment for a Single Voice Service over HSUPA." This switch is set to OFF by default. DRA_BASE_COVER_BE_TTI_REC This is a coverage-based dynamic TTI adjustment FG_SWITCH switch for the BE service over HSUPA. When it is set to ON, the TTI can be adjusted from 2 ms to 10 ms or from 10 ms to 2 ms. For details, see section 3.2.3 "Dynamic TTI Adjustment for a Single BE Service over HSUPA." This switch is set to OFF by default. DRA_BASE_COVER_BE_TTI_L2_O This switch specifies whether the function of PT_SWITCH coverage-based dynamic TTI adjustment for the BE service over HSUPA is effective for services over uplink enhanced L2. By default, this adjustment function is ineffective for services over uplink enhanced L2.

Note that if the algorithm of coverage-based BE service fallback from E -DCH to DCH is enabled, the algorithm of coverage-based dynamic TTI adjustment of BE services is automatically disabled. For details about the former algorithm, see the State Transition Feature Parameter Description.

3.2.2 Dynamic TTI Adjustment for a Single Voice Service over HSUPA This section describes dynamic TTI adjustment from 2 ms to 1 0 ms for a single voice service over HSUPA. The current version does not support dynamic TTI adjustment from 10 ms to 2 ms for the voice service. The purpose of the adjustment from 2 ms to 10 ms is to guarantee the converage of UEs on the edge of the cell and to reduce call drops. For the UE with 2ms TTI, if the u plink transmit power is insufficient for a period, the RNC considers th at the UE is in the poor coverage and will adjust the TTI of UE to 10ms.

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3.2.3 Dynamic TTI Adjustment for a Single BE Service over HSUPA This section involves the feature WRFD-010690 TTI Switch f or BE Services Based on Coverage. It describes dynamic TTI adjustment based on coverage for a single BE service over HSUPA. The TTI is adjusted from 2 ms to 10 ms in the case of poor coverage. The TTI is adjusted from 10 ms to 2 ms in the case of good coverage and huge uplink traffic volume. The RNC monitors the uplink transmit power and the traffic volume of UE: 

For the UE with 2ms TTI, If the uplink transmit power is insufficient and the traffic volume is relatively low for a period, the RNC adjusts the TTI of UE to 10ms.



For the UE with 10ms TTI, if the u plink transmit power is sufficient and the traffic volume is relatively high for a period, the RNC adjusts the TTI of UE to 2ms.

Note that the RNC can perform dynamic TTI adjustment for a single BE service only when the HSUPA DCCC function is disabled or ineffective. For detail information about HSUPA DCCC, see the DCCC Feature Parameter Description.

3.2.4 Dynamic TTI Adjustment for a Service Combination over HSUPA The RNC uses the dynamic TTI adjustment strategies listed in Table 3-3 for a service combination over HSUPA. Table 3-3 Dynamic TTI adjustment strategies for a service combination over HSUPA Combination Type

Dynamic TTI Adjustment Strategy

BE service included and voice service excluded

The decision on dynamic TTI adjustment is made for each individual BE service. The conditions on which the decision is based are the same as those for a single BE service. The dynamic TTI adjustment strategy is as follows: 



The TTI of the service combination is adjusted from 2 ms to 10 ms only when all the BE services meet the triggering conditions. The TTI of the service combination is adjusted from 10 ms to 2 ms as long as one BE service meets the triggering conditions.

Voice service included The dynamic TTI adjustment strategy is as follows: 

Dynamic TTI adjustment can be performed on th e basis of the voice service if the dynamic TTI adjustment switch for the voice service over HSUPA is set to ON. However, when the service combination includes the BE service and the HSUPA DCCC function is enabled, dynamic TTI adjustment is not performed even if the switch mentioned previously is set to ON.



Others

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Dynamic TTI adjustment is not performed if the dynamic TTI adjustment switch for the voice service over HSUPA is set to OFF.

Dynamic TTI adjustment is not performed.


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4 Parameters

4 Parameters Table 4-1 Parameter description Parameter ID

NE

MML Command

BeHsupa2msTtiRate BSC69 SET Ths 00 UFRC(Optional)

Description Meaning:This parameter specifies the rate threshold of 2ms TTI on the E-DCH for HSUPA BE service. When the cell capability and UE capability allows 2ms TTI, 2ms TTI on the E-DCH is used if the PS BE service carried on HSUPA with uplink rate isn't less than this threshold. Otherwise, 10ms TTI is used GUI Value Range:D8, D16, D32, D64, D128, D144, D256, D384, D608, D1280, D2048, D2720 Actual Value Range:8, 16, 32, 64, 128, 144, 2 56, 384, 608, 1280, 2048, 2720 Default Value:None

CSVoiceHsupaTti

BSC69 SET 00 UFRC(Optional)

Meaning:TTI type used for CS services over th e uplink HSPA channel GUI Value Range:EDCH_TTI_10ms, EDCH_TTI_2ms Actual Value Range:EDCH_TTI_10ms, EDCH_TTI_2ms Default Value:EDCH_TTI_10ms

DraSwitch

BSC69 SET Meaning:Dynamic resource allocation switch group. 00 UCORRMALGOSW 1) DRA_AQM_SWITCH: When the switch is on, the ITCH(Optional) active queue management algorithm is used for the RNC. 2) DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm for admission CE-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH( DraSwitch) is set to ON. 3) DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for admission CE-based BE services. 4) DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm for coverage-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_COVER_BE_TTI_RECFG_SWITCH(Dr aSwitch) is set to ON. 5) DRA_BASE_COVER_BE_TTI_RECFG_SWITCH:

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Parameter ID

4 Parameters

NE

MML Command

Description When the switch is on, the TTI dynamic adjustment algorithm is supported for coverage-based BE services. 6) DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm for differentiation-based BE services applies to the UE with the UL enhanced L2 feature. This parameter is valid when DRA_BASE_RES_BE_TTI_RECFG_SWITCH(DraS witch) is set to ON. 7) DRA_BASE_RES_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for differentiation-based BE services. 8) DRA_DCCC_SWITCH: When the switch is on, the dynamic channel reconfiguration control algorithm is used for the RNC. 9) DRA_HSDPA_DL_FLOW_CONTROL_SWITCH: When the switch is on, flow control is enabled for HSDPA services in AM mode. 10) DRA_HSDPA_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying HSDPA services can be changed to CELL_FACH at the RNC. If a PS BE service is carried over the HS-DSCH, the switch PS_BE_STATE_TRANS_SWITCH should be on simultaneously. If a PS real-time service is carried over the HS-DSCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be on simultaneously. 11) DRA_HSUPA_DCCC_SWITCH: When the switch is on, the DCCC algorithm is used for HSUPA. The DCCC switch must be also on before this switch takes effect. 12) DRA_HSUPA_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying HSUPA services can be changed to CELL_FACH at the RNC. If a PS BE service is carried over the E-DCH, the switch PS_BE_STATE_TRANS_SWITCH should be on simultaneously. If a PS real-time service is carried over the E-DCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be on simultaneously. 13) DRA_IP_SERVICE_QOS_SWITCH: Switch of the algorithm for increasing the quality of subscribed services. When this parameter is set to ON, the service priority weight of the subscriber whose key parameters (IP Address, IP Port, and IP Protocol Type) match the specified ones can be adjusted. In

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Parameter ID

4 Parameters

NE

MML Command

Description this way, the QoS is improved. 14) DRA_PS_BE_STATE_TRANS_SWITCH: When the switch is on, UE RRC status transition (CELL_FACH/CELL_PCH/URA_PCH) is allowed at the RNC. 15) DRA_PS_NON_BE_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying real-time services can be changed to CELL_FACH at the RNC. 16) DRA_R99_DL_FLOW_CONTROL_SWITCH: Under a poor radio environment, the QoS of high speed services drops considerably and the TX power is overly high. In this case, the RNC can set restrictions on certain transmission formats based on the transmission quality, thus lowering traffic speed and TX power. When the switch is on, the R99 downlink flow control function is enabled. 17) DRA_THROUGHPUT_DCCC_SWITCH: When the switch is on, the DCCC based on traffic statistics is supported over the DCH. 18) DRA_VOICE_SAVE_CE_SWITCH: when the switch is on, the TTI selection based on the voice service type (including VoIP and CS over HSPA) is supported when the service is initially established. 19) DRA_VOICE_TTI_RECFG_SWITCH: when the switch is on, the TTI adjustment based on the voice service type (including VoIP and CS over HSPA) is supported GUI Value Range:DRA_AQM_SWITCH, DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH, DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH, DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH, DRA_BASE_COVER_BE_TTI_RECFG_SWITCH, DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH, DRA_BASE_RES_BE_TTI_RECFG_SWITCH, DRA_DCCC_SWITCH, DRA_HSDPA_DL_FLOW_CONTROL_SWITCH, DRA_HSDPA_STATE_TRANS_SWITCH, DRA_HSUPA_DCCC_SWITCH, DRA_HSUPA_STATE_TRANS_SWITCH, DRA_IP_SERVICE_QOS_SWITCH, DRA_PS_BE_STATE_TRANS_SWITCH, DRA_PS_NON_BE_STATE_TRANS_SWITCH, DRA_R99_DL_FLOW_CONTROL_SWITCH, DRA_THROUGHPUT_DCCC_SWITCH, DRA_VOICE_SAVE_CE_SWITCH, DRA_VOICE_TTI_RECFG_SWITCH Actual Value Range:DRA_AQM_SWITCH, DRA_BASE_ADM_CE_BE_TTI_L2_OPT_SWITCH, DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH, DRA_BASE_COVER_BE_TTI_L2_OPT_SWITCH,

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Parameter ID

4 Parameters

NE

MML Command

Description DRA_BASE_COVER_BE_TTI_RECFG_SWITCH, DRA_BASE_RES_BE_TTI_L2_OPT_SWITCH, DRA_BASE_RES_BE_TTI_RECFG_SWITCH, DRA_DCCC_SWITCH, DRA_HSDPA_DL_FLOW_CONTROL_SWITCH, DRA_HSDPA_STATE_TRANS_SWITCH, DRA_HSUPA_DCCC_SWITCH, DRA_HSUPA_STATE_TRANS_SWITCH, DRA_IP_SERVICE_QOS_SWITCH, DRA_PS_BE_STATE_TRANS_SWITCH, DRA_PS_NON_BE_STATE_TRANS_SWITCH, DRA_R99_DL_FLOW_CONTROL_SWITCH, DRA_THROUGHPUT_DCCC_SWITCH, DRA_VOICE_SAVE_CE_SWITCH, DRA_VOICE_TTI_RECFG_SWITCH Default Value:None

MapSwitch

BSC69 SET Meaning:Service mapping strategy switch group. 00 UCORRMALGOSW 1) MAP_HSUPA_TTI_2MS_SWITCH: When the ITCH(Optional) switch is on, 2 ms TTI is supported for HSUPA. 2) MAP_INTER_RAT_PS_IN_CHANLE_LIMIT_SWITC H: When the switch is on, the PS services are transmitted on the DCH during the 2G-to-3G handover. When the switch is not on, the PS services can be transmitted on suitable channels according to the algorithm parameter configured for the RNC during the 2G-to-3G handover. 3) MAP_PS_BE_ON_E_FACH_SWITCH: When the switch is on, the PS BE services can be transmitted on the E-FACH(E-FACH for downlink and RACH for uplink, or E-FACH for downlink and E-RACH for downlink). 4) MAP_PS_STREAM_ON_E_FACH_SWITCH: When the switch is on, the PS streaming services can be transmitted on the E-FACH(E-FACH for downlink and RACH for uplink, or E-FACH for downlink and E-RACH for downlink). 5) MAP_PS_STREAM_ON_HSDPA_SWITCH: When the switch is on, a PS streaming service is mapped on the HS-DSCH if the DL maximum rate of the service is greater than or equal to the HSDPA threshold for streaming services. 6) MAP_PS_STREAM_ON_HSUPA_SWITCH: When the switch is on, a PS streaming service is mapped on the E-DCH if the UL maximum rate of the service is greater than or equal to the HSUPA threshold for streaming services. 7) MAP_SRB_6800_WHEN_RAB_ON_HSDSCH_SWI TCH: When the switch is on, the signaling is

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Parameter ID

4 Parameters

NE

MML Command

Description transmitted at a rate of 6.8 kbit/s if all the downlink traffic is on the HSDPA channel. 8) MAP_SRB_ON_DCH_OR_FACH_CS_RRC_SWITC H: When this switch is turned on, the SRB of a CS RRC connection cannot be established on HSPA channels. The RNC determines whether an RRC connection request is for a CS service based on the RRC connection setup cause and the value of Domain Indicator. For a UE of a version earlier than Release 6,?the RRC connection setup cause of CS services?is Originating Conversational Call or Terminating Conversational Call. For a UE of Release 6 or a later version, the value of Domain Indicator must be CS and the RRC connection setup cause must be Originating Conversational Call or Terminating Conversational Call for a CS service GUI Value Range:MAP_HSUPA_TTI_2MS_SWITCH, MAP_INTER_RAT_PS_IN_CHANLE_LIMIT_SWITC H, MAP_PS_BE_ON_E_FACH_SWITCH, MAP_PS_STREAM_ON_E_FACH_SWITCH, MAP_PS_STREAM_ON_HSDPA_SWITCH, MAP_PS_STREAM_ON_HSUPA_SWITCH, MAP_SRB_6800_WHEN_RAB_ON_HSDSCH_SWI TCH, MAP_SRB_ON_DCH_OR_FACH_CS_RRC_SWITC H Actual Value Range:MAP_HSUPA_TTI_2MS_SWITCH, MAP_INTER_RAT_PS_IN_CHANLE_LIMIT_SWITC H, MAP_PS_BE_ON_E_FACH_SWITCH, MAP_PS_STREAM_ON_E_FACH_SWITCH, MAP_PS_STREAM_ON_HSDPA_SWITCH, MAP_PS_STREAM_ON_HSUPA_SWITCH, MAP_SRB_6800_WHEN_RAB_ON_HSDSCH_SWI TCH, MAP_SRB_ON_DCH_OR_FACH_CS_RRC_SWITC H Default Value:None

StreamHsupa2msTti BSC69 SET RateThs 00 UFRC(Optional)

Meaning:Rate threshold of 2ms TTI on the E-DCH for the PS streaming service. The 2ms TTI is u sed on the E-DCH when it is supported by the cell and UE and when the rate of the HSUPA PS streaming service exceeds this threshold. Otherwise, 10ms TTI is used GUI Value Range:D8, D16, D32, D64, D128, D144, D256, D384, D608 Actual Value Range:8, 16, 32, 64, 128, 144, 2 56, 384, 608

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Parameter ID

4 Parameters

NE

MML Command

Description Default Value:D384

VoipHsupaTti

BSC69 SET 00 UFRC(Optional)

Meaning:TTI type used for VoIP services over the E-DCH GUI Value Range:EDCH_TTI_10ms, EDCH_TTI_2ms Actual Value Range:EDCH_TTI_10ms, EDCH_TTI_2ms Default Value:EDCH_TTI_10ms

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5 Counters

5 Counters There are no specific counters associated with this feature.

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6 Glossary

6 Glossary For the acronyms, abbreviations, terms, and d efinitions, see the Glossary .

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7 Reference Documents

7 Reference Documents [1] DCCC Feature Parameter Description [2] State Transition Feature Parameter Description

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Hsupa Tti Selection

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