3GPP TR 25.813 V0.56.1 0 (2006-03)
`
`Technical Report
`
`3rd Generation Partnership Project;
`Technical Specification Group Radio Access Network;
`Evolved Universal Terrestrial Radio Access (E-UTRA)
`and Evolved Universal Terrestrial Radio Access Network
`(E-UTRAN);
`Radio interface protocol aspects
`(Release 7)
`
`
`
`
`
`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.
`
`Ericsson v. IV II LLC
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`3GPP TR 25.813 V0.56.1 0 (2006-03)
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`Keywords
`Evolved UTRA and UTRAN
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`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
`
`Formatted: French (France)
`
`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, ATIS, CCSA, ETSI, TTA, TTC).
`All rights reserved.
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`Contents
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`Foreword .......................................................................................................................................................... 65
`Introduction ...................................................................................................................................................... 65
`1
`Scope ...................................................................................................................................................... 76
`2
`References .............................................................................................................................................. 76
`3
`Definitions, symbols and abbreviations ................................................................................................. 76
`3.1
`Definitions ........................................................................................................................................................... 76
`3.2
`Symbols ............................................................................................................................................................... 76
`3.3
`Abbreviations ...................................................................................................................................................... 76
`4
`Objectives and requirements .................................................................................................................. 87
`4.1
`Complexity .......................................................................................................................................................... 87
`4.2
`Performance ........................................................................................................................................................ 98
`5
`Protocol architecture .............................................................................................................................. 98
`5.1
`Overall protocol architecture .............................................................................................................................. 98
`5.1.1
`User plane .................................................................................................................................................. 1210
`5.1.2
`Control plane ............................................................................................................................................. 1210
`5.2
`Layer 1 ............................................................................................................................................................. 1310
`5.2.1
`Services and functions ............................................................................................................................... 1311
`5.2.2
`Transport channels .................................................................................................................................... 1311
`5.3
`Layer 2 ............................................................................................................................................................. 1412
`5.3.1
`MAC .......................................................................................................................................................... 1412
`5.3.1.1
`Logical Channels ................................................................................................................................. 1613
`5.3.1.1.1
`Control Channels ........................................................................................................................... 1713
`5.3.1.1.2
`Traffic Channels ............................................................................................................................ 1714
`5.3.1.2
`Mapping between logical channels and transport channels ................................................................ 1714
`5.3.1.2.1
`Mapping in Uplink ......................................................................................................................... 1814
`5.3.1.2.2
`Mapping in Downlink .................................................................................................................... 1814
`5.3.1.3
`Services and Functions ........................................................................................................................ 1815
`5.3.2
`PDCP ......................................................................................................................................................... 1915
`5.3.3
`Data flows through Layer 2....................................................................................................................... 1915
`5.4
`Layer 3 - RRC ................................................................................................................................................. 1916
`5.4.1
`LTE RRC protocol states & state transitions ............................................................................................ 1916
`5.4.2
`Functions ................................................................................................................................................... 2117
`5.5
`Protocol termination ........................................................................................................................................ 2218
`6
`ARQ and HARQ ................................................................................................................................ 2218
`7
`Scheduling .......................................................................................................................................... 2218
`8
`QoS Control ....................................................................................................................................... 2218
`9
`Mobility .............................................................................................................................................. 2218
`9.1
`Intra E-UTRAN ............................................................................................................................................... 2319
`9.1.1
`UE identification on the radio interface .................................................................................................... 2319
`9.1.2
`Cell selection ............................................................................................................................................. 2319
`9.1.3
`Cell reselection .......................................................................................................................................... 2319
`9.1.4
`Paging ........................................................................................................................................................ 2319
`9.1.5
`Handover ................................................................................................................................................... 2319
`9.1.6
`Measurements ............................................................................................................................................ 2319
`9.1.6.1
`Intra-frequency .................................................................................................................................... 2319
`9.1.6.2
`Inter-frequency .................................................................................................................................... 2319
`9.1.7
`Network aspects ........................................................................................................................................ 2319
`9.2
`Inter RAT ........................................................................................................................................................ 2420
`9.2.1
`Cell reselection .......................................................................................................................................... 2420
`9.2.2
`Handover ................................................................................................................................................... 2420
`9.2.3
`Measurements ............................................................................................................................................ 2420
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`3GPP
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`Inter-RAT handovers from E-UTRAN ............................................................................................... 2420
`9.2.3.1
`Inter-RAT Handovers to E-UTRAN ................................................................................................... 2420
`9.2.3.2
`Inter-RAT cell reselection from E-UTRAN ....................................................................................... 2420
`9.2.3.3
`Limiting measurement load at UE ...................................................................................................... 2420
`9.2.3.4
`Network Aspects ....................................................................................................................................... 2521
`9.2.4
`Security .............................................................................................................................................. 2521
`10
`Security Termination Points ........................................................................................................................... 2521
`10.1
`11 MBMS ................................................................................................................................................ 2521
`12 Migration and compatibility ............................................................................................................... 2521
`12.1
`Migration scenario .......................................................................................................................................... 2622
`12.2
`Interaction with previous releases .................................................................................................................. 2622
`12.3
`Interoperability ................................................................................................................................................ 2622
`13 UE capabilities ................................................................................................................................... 2622
`14
`Impact on specifications ..................................................................................................................... 2622
`14.1
`Specification methodology ............................................................................................................................. 2622
`14.2
`Affected specifications .................................................................................................................................... 2622
`14.3
`New specifications .......................................................................................................................................... 2622
`Annex A: Change history ........................................................................................................................... 2723
`Annex B: RACH and Contention Resolution ........................................................................................... 2824
`Annex C: Architecture Progress ............................................................................................................... 2925
`Annex D: Editorship ................................................................................................................................... 3026
`Foreword ............................................................................................................................................................ 5
`Introduction ........................................................................................................................................................ 5
`1
`Scope ........................................................................................................................................................ 6
`2
`References ................................................................................................................................................ 6
`3
`Definitions, symbols and abbreviations ................................................................................................... 6
`3.1
`Definitions ............................................................................................................................................................. 6
`3.2
`Symbols ................................................................................................................................................................. 6
`3.3
`Abbreviations ........................................................................................................................................................ 6
`4
`Objectives and requirements .................................................................................................................... 7
`4.1
`Complexity ............................................................................................................................................................ 7
`4.2
`Performance .......................................................................................................................................................... 8
`5
`Protocol architecture ................................................................................................................................ 8
`5.1
`Overall protocol architecture ................................................................................................................................ 8
`5.1.1
`User plane ........................................................................................................................................................ 9
`5.1.2
`Control plane ................................................................................................................................................. 10
`5.2
`Layer 1 ................................................................................................................................................................. 10
`5.2.1
`Services and functions ................................................................................................................................... 10
`5.2.2
`Transport channels ........................................................................................................................................ 11
`5.3
`Layer 2 ................................................................................................................................................................. 12
`5.3.1
`MAC .............................................................................................................................................................. 12
`5.3.1.1
`Logical Channels ..................................................................................................................................... 13
`5.3.1.1.1
`Control Channels ............................................................................................................................... 13
`5.3.1.1.2
`Traffic Channels ................................................................................................................................ 14
`5.3.1.2
`Mapping between logical channels and transport channels .................................................................... 14
`5.3.1.2.1
`Mapping in Uplink ............................................................................................................................. 14
`5.3.1.2.2
`Mapping in Downlink ........................................................................................................................ 14
`5.3.1.3
`Services and Functions ............................................................................................................................ 15
`5.3.2
`RLC (Outer ARQ) ......................................................................................................................................... 15
`5.3.3
`PDCP ............................................................................................................................................................. 16
`5.3.4
`Data flows through Layer 2........................................................................................................................... 16
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`Layer 3 - RRC ..................................................................................................................................................... 16
`5.4
`LTE RRC protocol states & state transitions ................................................................................................ 16
`5.4.1
`Functions ....................................................................................................................................................... 17
`5.4.2
`Protocol termination ............................................................................................................................................ 18
`5.5
`ARQ and HARQ .................................................................................................................................... 18
`6
`Scheduling .............................................................................................................................................. 18
`7
`QoS Control ........................................................................................................................................... 18
`8
`Mobility .................................................................................................................................................. 19
`9
`Intra E-UTRAN ................................................................................................................................................... 19
`9.1
`UE identification on the radio interface ........................................................................................................ 19
`9.1.1
`Cell selection ................................................................................................................................................. 19
`9.1.2
`Cell reselection .............................................................................................................................................. 19
`9.1.3
`Paging ............................................................................................................................................................ 19
`9.1.4
`Handover ....................................................................................................................................................... 19
`9.1.5
`Measurements ................................................................................................................................................ 19
`9.1.6
`Intra-frequency ........................................................................................................................................ 19
`9.1.6.1
`Inter-frequency ........................................................................................................................................ 19
`9.1.6.2
`Network aspects ............................................................................................................................................ 20
`9.1.7
`Inter RAT ............................................................................................................................................................ 20
`9.2
`Cell reselection .............................................................................................................................................. 20
`9.2.1
`Handover ....................................................................................................................................................... 20
`9.2.2
`Measurements ................................................................................................................................................ 20
`9.2.3
`Inter-RAT handovers from E-UTRAN ................................................................................................... 20
`9.2.3.1
`Inter-RAT Handovers to E-UTRAN ....................................................................................................... 20
`9.2.3.2
`Inter-RAT cell reselection from E-UTRAN ........................................................................................... 20
`9.2.3.3
`Limiting measurement load at UE .......................................................................................................... 20
`9.2.3.4
`Network Aspects ........................................................................................................................................... 21
`9.2.4
`Security .................................................................................................................................................. 21
`10
`Security Termination Points ............................................................................................................................... 21
`10.1
`11 MBMS .................................................................................................................................................... 21
`12 Migration and compatibility ................................................................................................................... 21
`12.1
`Migration scenario .............................................................................................................................................. 22
`12.2
`Interaction with previous releases ...................................................................................................................... 22
`12.3
`Interoperability .................................................................................................................................................... 22
`13 UE capabilities ....................................................................................................................................... 22
`14
`Impact on specifications ......................................................................................................................... 22
`14.1
`Specification methodology ................................................................................................................................. 22
`14.2
`Affected specifications ........................................................................................................................................ 22
`14.3
`New specifications .............................................................................................................................................. 22
`Annex A: Change history ............................................................................................................................... 23
`Annex B: RACH and Contention Resolution ............................................................................................... 24
`Annex C: Architecture Progress ................................................................................................................... 25
`Annex D: Editorship ....................................................................................................................................... 26
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`3GPP TR 25.813 V0.56.1 0 (2006-03)
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`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;
`
`2 presented to TSG for approval;
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`3 or greater indicates TSG approved document under change control.
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`y
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`the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
`updates, etc.
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`z
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`the third digit is incremented when editorial only changes have been incorporated in the document.
`
`Introduction
`With enhancements such as HSDPA and Enhanced Uplink, the 3GPP radio-access technology will remain highly
`competitive for several years to come. However, to ensure competitiveness in an even longer time frame, the long-term
`evolution of the 3GPP radio-access technology is under study. Important parts of such a long-term evolution include
`reduced latency, higher user data rates, optimised support for packet services, improved system capacity and coverage,
`and reduced cost for the operator, while also reducing system complexity. In order to achieve this, evolutions of the
`radio interface as well as the radio network architecture are considered in the study item “Evolved UTRA and UTRAN”
`[1]. This document covers the Radio Interface Protocol Aspects of the study item.
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`Scope
`1
`The purpose of this TR is to help TSG RAN WG2 to define and describe the radio interface protocol evolution under
`consideration for Evolved UTRA and UTRAN [1]. This activity involves the Radio Access Network work area of the
`3GPP studies for evolution and has impacts both on the Mobile Equipment and Access Network of the 3GPP systems.
`This document is intended to gather the agreements rather than comparing different solutions.
`
`NOTE:
`
`this document is a living document, i.e. it is permanently updated and presented to TSG-RAN meetings.
`
`References
`2
`The following documents contain provisions which, 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.
`
`[1]
`
`[2]
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`[3]
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`[4]
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`[5]
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`TD RP-040461: “Proposed Study Item on Evolved UTRA and UTRAN”.
`
`3GPP TR 21.905: “Vocabulary for 3GPP Specifications”.
`
`3GPP TR 25.913: “Requirements for Evolved UTRA and UTRAN”.
`
`3GPP TR 25.912; “Feasibility Study for Evolved UTRA and UTRAN”.
`
`3GPP TR 25.814: “Physical Layer Aspects for Evolved UTRA”.
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`3
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`Definitions, symbols and abbreviations
`
`Definitions
`3.1
`For the purposes of the present document, the following terms and definitions apply.
`
`<defined term>: <definition>.
`
`Symbols
`3.2
`For the purposes of the present document, the following symbols apply:
`
`<Explanation>
`
`<symbol>
`
`Abbreviations
`3.3
`For the purposes of the present document, the following abbreviations apply:
`
`aGW
`ARQ
`AS
`DL
`
`E-UTRAN Access Gateway
`Automatic Repeat Request
`Access Stratum
`Downlink
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`Formatted: Italian (Italy)
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`eNB
`E-UTRA
`E-UTRAN
`HARQ
`HO
`L1
`L2
`L3
`MAC
`NAS
`PDCP
`PDU
`RLC
`RRC
`SAE
`SDU
`TCH
`UE
`UL
`UMTS
`UTRA
`UTRAN
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`
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`E-UTRAN NodeB
`Evolved Universal Terrestrial Radio Access
`Evolved Universal Terrestrial Radio Access Network
`Hybrid Automatic Repeat Request
`Handover
`Layer 1 (physical layer)
`Layer 2 (data link layer)
`Layer 3 (network layer)
`Medium Access Control
`Non-Access Stratum
`Packet Data Convergence Protocol
`Protocol Data Unit
`Radio Link Control
`Radio Resource Control
`System Architecture Evolution
`Service Data Unit
`Traffic Channel
`User Equipment
`Uplink
`Universal Mobile Telecommunications System
`UMTS Terrestrial Radio Access
`UMTS Terrestrial Radio Access Network
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`Other abbreviations used in the present document are listed in 3GPP TR 21.905 [2].
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`Objectives and requirements
`4
`Simplification of the UTRAN protocol architecture and actual protocols is expected.
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`Complexity
`4.1
`A key requirement of E-UTRAN is to maintain the complexity at a reasonable level. In this respect the following
`assumptions apply:
`
`- The number of transport channels will be reduced, by making use of shared channels.
`
`- Dedicated transport channels are not supported by E-UTRAN.
`
`- The number of different MAC-entities will be reduced (MAC-d not needed in the absence of dedicated transport
`channels).
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`- Segmentation/Re-assembly function is agreed to be no longer needed on RLC.
`
`- The BMC layer and the CTCH are not needed i.e. All data broadcast will be on MBMS and on e.g. MTCH.
`
`- There is no SHO in the downlink (as currently supported for Rel-6 dedicated channels) for the shared channel, in
`case of unicast transmissions. Note: This does not preclude the potential support of other schemes such as fast
`cell selection, bi-casting, "softer HO" (L1 combining) for intra-site cases, etc.
`
`- Compressed mode should not be supported. If some transmission/reception gaps for measurement purpose have
`to be provided to the UE (exact need/case to be defined), this will be based on scheduling gaps.
`
`- Only one receiver structure will be assumed for defining the measurements and their requirements.
`
`- RRC should be simplified by e.g. reducing the number of RRC states compared to UTRAN (. e.g. Rremoval of
`CELL_FACH is agreed).
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`3GPP TR 25.813 V0.56.1 0 (2006-03)
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`Performance
`From R2-051759: U-Plane Latency < 5msec; C-Plane Latency < 100msec (from Inactive to Active);
`optimisation of User Plane for high bit rates; hide breaks from application; shorter transitions (state
`transitions, handover within UTRA?); support “always-on” efficiently.
`
`5
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`Protocol architecture
`
`Overall protocol architecture
`5.1
`The E-UTRAN consists of eNBs, providing the E-UTRA user plane (PHY/MAC) and control plane (RRC) protocol
`terminations towards the UE. The eNBs are interconnected with each other in a meshed way and interface to the