3GPP TR 25.804 V0.2.0 1 (2004-05)
`
`Technical Report
`
`3rd Generation Partnership Project;
`Technical Specification Group Radio Access Network;
`Feasibility Study on Uplink Enhancements for UTRA TDD;
`(Release 6)
`
`
`
`
`
`
`
`
`
`
`
`The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.
`
`
`The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented.
`
`This Specification is provided for future development work within 3GPP only. The Organizational Partners accept no liability for any use of this Specification.
`Specifications and reports for implementation of the 3GPP TM system should be obtained via the 3GPP Organizational Partners' Publications Offices.
`
`
`
`NAC1014
`Page 1
`
`

`

`Release 6
`
`
`2
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`
`
`
`
`
`
`
`
`
`
`
`
`Keywords
`UMTS, radio, packet mode, layer 1
`
`3GPP
`
`Postal address
`
`
`3GPP support office address
`650 Route des Lucioles - Sophia Antipolis
`Valbonne - FRANCE
`Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
`
`Internet
`http://www.3gpp.org
`
`Copyright Notification
`
`No part may be reproduced except as authorized by written permission.
`The copyright and the foregoing restriction extend to reproduction in all media.
`
`© 2004, 3GPP Organizational Partners (ARIB, CCSA, ETSI, ATIS, TTA, TTC).
`All rights reserved.
`
`
`3GPP
`
`NAC1014
`Page 2
`
`

`

`Release 6
`
`
`Contents
`
`3
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`Foreword............................................................................................................................................................. 5
`
`Introduction ........................................................................................................................................................ 6
`
`1
`
`2
`
`3
`
`4
`
`Scope ........................................................................................................................................................ 7
`
`References ................................................................................................................................................ 7
`
`Definitions, symbols and abbreviations ................................................................................................... 7
`
`Requirements ............................................................................................................................................ 8
`
`5
`5.0
`5.1
`5.1.1
`5.2
`5.2.1
`5.2.2
`5.2.3
`5.2.4
`5.3
`5.4
`5.4.1
`5.4.1.1
`5.4.1.2
`5.4.2
`
`Reference Techniques in Earlier 3GPP Releases ..................................................................................... 8
` Connection State Model .................................................................................................................................... 8
` Allocation of Dedicated Resources ................................................................................................................... 9
`Uplink/Downlink Synchronization ............................................................................................................... 9
`Allocation of Shared Resources ....................................................................................................................... 11
`General ....................................................................................................................................................... 11
`Measurements used for Scheduling ............................................................................................................ 11
`PUSCH Capacity Request Message ........................................................................................................... 12
`Physical Shared Channel Allocation Message ........................................................................................... 12
`Uplink TFCS Management with RRC Signalling ............................................................................................ 13
`Transport Format Combination Selection in the UE ........................................................................................ 14
`Description of TFC selection method ........................................................................................................ 14
`TFC selection in UE for 3.84 Mcps TDD option.................................................................................. 16
`TFC selection in UE for 1.28 Mcps TDD option.................................................................................. 17
`TFC selection method as a reference case for Enhanced Uplink ............................................................... 18
`
`6
`6.1
`6.1.1
`6.1.2
`6.2
`6.2.1
`6.2.2
`6.2.3
`6.3
`6.4
`
`Overview of considered Uplink Enhancements for UTRA TDD .......................................................... 18
`Scheduling <Node B controlled scheduling, AMC> ....................................................................................... 18
`Node-B Rate Scheduling ............................................................................................................................ 19
`Node-B Physical Resource Scheduling ...................................................................................................... 21
`Hybrid ARQ..................................................................................................................................................... 21
`General ....................................................................................................................................................... 21
`Transport Channel Processing .................................................................................................................... 22
`Associated Signalling ................................................................................................................................. 22
`Fast Allocation of Dedicated or Shared Resources .......................................................................................... 23
`Signalling ......................................................................................................................................................... 23
`
`7
`7.1
`7.1.1
`7.1.1.1
`7.1.1.2
`
`Physical Layer Structure Alternatives for Uplink Enhancements for UTRA TDD ............................... 23
`Relationship to existing transport channels ..................................................................................................... 23
`Transport Channel Structure ...................................................................................................................... 24
`Number of E-UCHs .............................................................................................................................. 25
`TTI ........................................................................................................................................................ 25
`
`8
`8.1
`8.1.1
`8.1.2
`8.1.3
`8.1.4
`8.1.5
`8.2
`8.2.1
`8.2.2
`8.2.3
`8.2.4
`8.2.5
`8.3
`8.3.1
`
`Evaluation of Techniques for Enhanced Uplink .................................................................................... 25
`Scheduling <Node B controlled scheduling, AMC> ....................................................................................... 25
`Performance Evaluation ............................................................................................................................. 25
`Complexity Evaluation <UE and UTRAN impacts> ................................................................................. 25
`Downlink Signalling .................................................................................................................................. 25
`Uplink Signalling ....................................................................................................................................... 25
`Compatibility with earlier Releases ........................................................................................................... 25
`Hybrid ARQ..................................................................................................................................................... 25
`Performance Evaluation ............................................................................................................................. 25
`Complexity Evaluation <UE and UTRAN impacts> ................................................................................. 25
`Downlink Signalling .................................................................................................................................. 26
`Uplink Signalling ....................................................................................................................................... 26
`Compatibility with earlier Releases ........................................................................................................... 26
`Fast Allocation of Dedicated or Shared Resources .......................................................................................... 26
`Performance Evaluation ............................................................................................................................. 26
`
`3GPP
`
`NAC1014
`Page 3
`
`

`

`Release 6
`
`
`4
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`8.3.2
`8.3.3
`8.3.4
`8.3.5
`8.4
`8.4.1
`8.4.2
`8.4.3
`8.4.4
`8.4.5
`
`Complexity Evaluation <UE and UTRAN impacts> ................................................................................. 26
`Downlink Signalling .................................................................................................................................. 26
`Uplink Signalling ....................................................................................................................................... 26
`Compatibility with earlier Releases ........................................................................................................... 26
` Physical Layer Enhancements ........................................................................................................................ 26
`Performance Evaluation ............................................................................................................................. 26
`Complexity Evaluation <UE and UTRAN impacts> ................................................................................. 26
`Downlink Signalling .................................................................................................................................. 26
`Uplink Signalling ....................................................................................................................................... 26
`Compatibility with earlier Releases ........................................................................................................... 26
`
`9
`
`Impacts to the Radio Network Protocol Architecture ............................................................................ 26
`
`10
`
`Impacts to L2/L3 Protocols .................................................................................................................... 26
`
`11 Conclusions and Recommendations ....................................................................................................... 26
`
`Annex A: Simulation Assumptions and Results ............................................................................................... 28
`
`A.1 Link Simulation Assumptions ................................................................................................................ 28
`
`A.2 Link Simulation Results ......................................................................................................................... 28
`
`A.3 System Simulation Assumptions ............................................................................................................ 28
`
`A.4 System Simulation Results ..................................................................................................................... 28
`
`A.5 Traffic Models ........................................................................................................................................ 28
`
`Annex B: Change history ............................................................................................................................... 28
`
`Foreword............................................................................................................................................................. 5
`
`Introduction ........................................................................................................................................................ 5
`
`1
`
`2
`
`3
`
`4
`
`Scope ........................................................................................................................................................ 7
`
`References ................................................................................................................................................ 7
`
`Definitions, symbols and abbreviations ................................................................................................... 7
`
`Requirements ............................................................................................................................................ 8
`
`Reference Techniques in Earlier 3GPP Releases ..................................................................................... 8
`5
`5.0 Connection State Model .......................................................................................................................................... 8
`5.1 Allocation of Dedicated Resources ......................................................................................................................... 9
`5.1.1
`Uplink/Downlink Synchronization .................................................................................................................... 9
`5.2 Allocation of Shared Resources ............................................................................................................................ 11
`5.2.1
`General ............................................................................................................................................................. 11
`5.2.2
`Measurements used for Scheduling ................................................................................................................. 11
`5.2.3
`PUSCH Capacity Request Message ................................................................................................................. 12
`5.2.4
`Physical Shared Channel Allocation Message ................................................................................................. 12
`5.3 Uplink TFCS Management with RRC Signalling ................................................................................................. 13
`5.4
`Transport Format Combination Selection in the UE ............................................................................................. 14
`5.4.1
`Description of TFC selection method .............................................................................................................. 14
`5.4.1.1 TFC selection in UE for 3.84 Mcps TDD option ............................................................................................. 16
`5.4.1.2 TFC selection in UE for 1.28 Mcps TDD option ............................................................................................. 17
`5.4.2
`TFC selection method as a reference case for Enhanced Uplink ..................................................................... 18
`
`Overview of considered Uplink Enhancements for UTRA TDD .......................................................... 18
`6
`Scheduling <Node B controlled scheduling, AMC> ............................................................................................. 18
`6.1
`6.2 Hybrid ARQ .......................................................................................................................................................... 19
`6.2.1
`General ............................................................................................................................................................. 19
`6.2.2
`Transport Channel Processing ......................................................................................................................... 19
`6.2.3
`Associated Signalling ...................................................................................................................................... 20
`6.3
`Fast Allocation of Dedicated or Shared Resources ............................................................................................... 21
`6.4
`Signalling .............................................................................................................................................................. 21
`
`3GPP
`
`NAC1014
`Page 4
`
`

`

`Release 6
`
`
`5
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`7
`
`Physical Layer Structure Alternatives for Uplink Enhancements for UTRA TDD ............................... 21
`
`Evaluation of Techniques for Enhanced Uplink .................................................................................... 21
`8
`Scheduling <Node B controlled scheduling, AMC> ............................................................................................. 21
`8.1
`Performance Evaluation ................................................................................................................................... 21
`8.1.1
`Complexity Evaluation <UE and UTRAN impacts> ....................................................................................... 21
`8.1.2
`Downlink Signalling ........................................................................................................................................ 21
`8.1.3
`Uplink Signalling ............................................................................................................................................. 21
`8.1.4
`Compatibility with earlier Releases ................................................................................................................. 21
`8.1.5
`8.2 Hybrid ARQ .......................................................................................................................................................... 21
`8.2.1
`Performance Evaluation ................................................................................................................................... 21
`8.2.2
`Complexity Evaluation <UE and UTRAN impacts> ....................................................................................... 21
`8.2.3
`Downlink Signalling ........................................................................................................................................ 21
`8.2.4
`Uplink Signalling ............................................................................................................................................. 21
`8.2.5
`Compatibility with earlier Releases ................................................................................................................. 22
`8.3
`Fast Allocation of Dedicated or Shared Resources ............................................................................................... 22
`8.3.1
`Performance Evaluation ................................................................................................................................... 22
`8.3.2
`Complexity Evaluation <UE and UTRAN impacts> ....................................................................................... 22
`8.3.3
`Downlink Signalling ........................................................................................................................................ 22
`8.3.4
`Uplink Signalling ............................................................................................................................................. 22
`8.3.5
`Compatibility with earlier Releases ................................................................................................................. 22
`8.4
` Physical Layer Enhancements .............................................................................................................................. 22
`8.4.1
`Performance Evaluation ................................................................................................................................... 22
`8.4.2
`Complexity Evaluation <UE and UTRAN impacts> ....................................................................................... 22
`8.4.3
`Downlink Signalling ........................................................................................................................................ 22
`8.4.4
`Uplink Signalling ............................................................................................................................................. 22
`8.4.5
`Compatibility with earlier Releases ................................................................................................................. 22
`
`9
`
`Impacts to the Radio Network Protocol Architecture ............................................................................ 22
`
`10
`
`Impacts to L2/L3 Protocols .................................................................................................................... 22
`
`11 Conclusions and Recommendations ....................................................................................................... 22
`
`Annex A: Simulation Assumptions and Results ............................................................................................... 23
`
`A.1 Link Simulation Assumptions ................................................................................................................ 23
`
`A.2 Link Simulation Results ......................................................................................................................... 23
`
`A.3 System Simulation Assumptions ............................................................................................................ 23
`
`A.4 System Simulation Results ..................................................................................................................... 23
`
`A.5 Traffic Models ........................................................................................................................................ 23
`
`Annex B: Change history ............................................................................................................................... 23
`
`
`Foreword
`
`This Technical Report has been produced by the 3rd Generation Partnership Project (3GPP).
`
`The contents of the present document are subject to continuing work within the TSG and may change following formal
`TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
`identifying change of release date and an increase in version number as follows:
`
`Version x.y.z
`
`where:
`
`x
`
`the first digit:
`
`1 presented to TSG for information;
`
`3GPP
`
`NAC1014
`Page 5
`
`

`

`Release 6
`
`
`6
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`2 presented to TSG for approval;
`
`3 or greater indicates TSG approved document under change control.
`
`y
`
`the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
`updates, etc.
`
`z
`
`the third digit is incremented when editorial only changes have been incorporated in the document.
`
`Introduction
`
`At the 3GPP TSG RAN #20 meeting, the study item on “Uplink Enhancements for UTRA TDD” was approved [1].
`
`The justification of the study item is that with the growth in IP based services, there is a burgeoning requirement for
`increasing the coverage and throughput and reducing the delay of the uplink. Applications that could benefit from an
`enhanced uplink include web browsing, video clips, multimedia messaging and other IP based applications. This study
`item investigates enhancements that can be applied to UTRA TDD in order to improve the performance for uplink
`dedicated and shared transport channels.
`
`The study includes, but is not restricted to the following topics related to uplink enhancements for UTRA TDD in order
`to enhance uplink performance in general or to enhance the uplink performance for background, interactive and
`streaming based traffic:
`
` Adaptive modulation and coding
`
` Hybrid ARQ
`
` Node B controlled scheduling
`
` Fast allocation of dedicated and/or shared resources
`
` Enhancements to uplink dedicated channels
`
` Enhancements to uplink shared channels
`
` Physical layer and higher layer signalling mechanisms to support the enhancements
`
`3GPP
`
`NAC1014
`Page 6
`
`

`

`Release 6
`
`
`1
`
`Scope
`
`7
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`This present document details and compares proposed enhancements to the UTRA TDD uplink in terms of gains and
`complexity and draws conclusions on future work.
`
`This document is the technical report for the Release 6 study item “Uplink Enhancements for UTRA TDD” [1]. The
`purpose of this TR is to help TSG RAN WG1 to define and describe the potential enhancements under consideration
`and compare the benefits of each enhancement with earlier releases for improving the performance of the UTRA TDD
`uplink, along with the complexity evaluation of each technique. The scope is to either enhance uplink performance in
`general or to enhance the uplink performance for background, interactive and streaming based traffic.
`
`This activity involves the Radio Access work area of the 3GPP studies and has impacts both on the Mobile Equipment
`and Access Network of the 3GPP systems.
`
`2
`
`References
`
`The following documents contain provisions that, through reference in this text, constitute provisions of the present
`document.
`
` References are either specific (identified by date of publication, edition number, version number, etc.) or
`non-specific.
`
` For a specific reference, subsequent revisions do not apply.
`
` For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
`a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
`Release as the present document.
`
`3GPP TSG RAN RP-030359: "Study Item Description for Uplink Enhancements for UTRA
`TDD".
`
`3GPP TS 25.123 V3.13.0 (2003-06), “Requirements for support of radio resource management
`(TDD)”, June 2003
`
`TS 25.224, V5.4.0, “Physical layer procedures (TDD)”, June 2003
`
`TS 25.321 V5.5.0 “Medium Access Control (MAC), Protocol specification, September 2003
`
`TS 25.331, V5.5.0, "Radio Resource Control (RRC); Protocol Specification", June 2003
`
`3GPP TR 25.942 V3.3.0 (2002-06), RF System Scenarios, June 2002.
`
`3GPP TR 25.853 V4.0.0 (2001-03), “Delay Budget within the Access Stratum”, March 2001
`
`ETSI TR 101 12, Universal Mobile Telecommunications System (UMTS); Selection procedures
`for the choice of radio transmission technologies of the UMTS (UMTS 30.03 V3.2.0)
`
`3GPP TR 25.896 “Feasibility Study for Enhanced Uplink for UTRA FDD” v2.0.0
`
`Definitions, symbols and abbreviations
`
`Enhanced DCH, a new dedicated transport channel type or enhancements to an
`existing dedicated transport channel type (if required by a particular proposal)
`
`Enhanced DPCH, a new physical channel or enhancements to the current DPCH (if
`required by a particular proposal)
`
`[1]
`
`[2]
`
`[3]
`
`[4]
`
`[5]
`
`[6]
`
`[7]
`
`[8]
`
`[9]
`
`3
`
`
`
`E-DCH
`
`E-DPCH
`
`
`
`3GPP
`
`NAC1014
`Page 7
`
`

`

`Release 6
`
`
`8
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`3GPP
`
`NAC1014
`Page 8
`
`

`

`Release 6
`
`
`9
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`4
`
`Requirements
`
`- The overall goal is to improve the coverage and throughput as well as to reduce the delay of the uplink
`dedicated and common transport channels.
`
`- The focus shall be on urban, sub-urban and rural deployment scenarios. Uplink enhancements should be
`optimised for low-speed to medium-speed scenarios, but high-speed scenarios should also be supported.
`
`- The study shall investigate the possibilities to enhance the uplink performance in general, with priority to
`streaming, interactive and background services.
`
`-
`
`Features or group of features should demonstrate significant incremental gain, with reasonable complexity.
`The value added per feature should be considered in the evaluation.
`
`- The UE and network complexity shall be minimised for a given level of system performance.
`
`- The impact on current releases in terms of both protocol and hardware perspectives shall be taken into account.
`
`- Enhancements shall either improve uplink performance for dedicated channels or for common channels or for
`both dedicated and common channels.
`
`- Enhancements shall improve uplink performance for at least one of the UTRA TDD modes. Provided that
`system performance and complexity are not unduly impacted and that an enhancement is applicable to the
`UTRA mode under consideration, commonality between the UTRA modes (1.28Mcps TDD, 3.84 Mcps TDD
`and FDD) should be maintained. Inability to support an enhancement in one TDD mode shall not preclude its
`consideration for the other mode.
`
`-
`
`It shall be possible to introduce the new features in a network which has terminals from Release’99, Release 4
`or Release 5.
`
`Reference Techniques in Earlier 3GPP Releases
`
`5
`
`
`
`5.0
`
` Connection State Model
`
`A fundamental concept in WCDMA is the connection state model, illustrated in Figure 5.0.1. The connection state
`model enables optimization of radio and hardware resources depending on the activity level of each UE and / or the
`traffic type of the service provided.
`
`Both UTRA FDD and TDD modes provide support for Dedicated Channels and as an option support the DL Shared
`Channel. In addition, UTRA TDD modes as an option provide support for the UL Shared Channel. Similar to the DL
`Shared Channels in UTRA FDD and TDD modes, support of the UL Shared Channel in UTRA TDD is indicated by the
`UE capability signalling.
`
`When there is high transmission activity (in either uplink, downlink or both), the RRC connection state may be either
`CELL_DCH or depending on UE capabilities CELL_FACH state. The choice of state depends on a variety of factors
`including transmission activity level, traffic type, need for dedicated channels and implementation:
`
`- When dedicated channels are used, the UE must be in CELL_DCH state, where power-controlled dedicated
`channels are established to/from the UE. In CELL_DCH state, the UE is assigned dedicated radio and
`hardware resources. Depending on UE capability, the UE may be allocated shared resources in addition to
`dedicated resources in CELL_DCH state.
`
`- When dedicated channels are not used, but there is transmission activity, the UE should be in CELL_FACH
`state, where only common channels are used. In CELL_FACH state, no dedicated hardware resources in the
`Node B are needed.
`
`3GPP
`
`NAC1014
`Page 9
`
`

`

`Release 6
`
`
`10
`
`3GPP TR 25.804 V0.1.1 (2004-05)
`
`- When there is no transmission activity the UE should be in CELL_PCH or URA_PCH states, which enable
`very low UE power consumption but do not allow any data transmission. These states are not further discussed
`in this section.
`
`
`
`
`
`Figure 5.0.1: Connection states.
`
`5.1
`
` Allocation of Dedicated Resources
`
`Switching between CELL_DCH and CELL_FACH is controlled by the SRNC with RRC signalling based on requests
`from either the network or the UE. Entering CELL_DCH implies the establishment of a DCH, which depending on UE
`capabilities may involve a physical layer random access procedure, NBAP and RRC signalling, and uplink and
`downlink physical channel synchronization.
`
`Clearly, it is desirable to switch a UE to CELL_FACH state when there is less transmission activity in order to save
`network resources and to reduce the UE power consumption. Switching between CELL_DCH and CELL_FACH is
`especially useful in scenarios with a large number of bursty packet data users, where there is a risk that the system
`becomes resource limited if users temporarily not receiving/transmitting any packets are not switched to CELL_FACH.
`When the network decides that a DPCH is required (e.g. due to an increase in transmission activity), the UE should
`rapidly be switched back to CELL_DCH and a dedicated channel is established.
`
`5.1.1
`
`Uplink/Downlink Synchronization
`
`Examples for DCH radio