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`TS 25.301 V3.2.0 (1999-10)
`
`Technical Specification
`
`3rd Generation Partnership Project (3GPP);
`Technical Specification Group (TSG) RAN;
`Working Group 2 (WG2);
`
`Radio Interface Protocol Architecture
`
`
`
`
`
`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 Organisational Partners and shall not be implemented.
`This Specification is provided for future development work within 3GPP only. The Organisational 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 Organisational Partners' Publications Offices.
`
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`2
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`TS 25.301 V3.2.0 (1999-10)
`
`Reference
`<Workitem> (<Shortfilename>.PDF)
`
`Keywords
`Digital cellular telecommunications system,
`Universal Mobile Telecommunication System
`(UMTS), UTRA, IMT-2000
`
`
`3GPP
`
`Postal address
`
`
`Office address
`
`
`
`
`
`
`
`Internet
`secretariat@3gpp.org
`Individual copies of this deliverable
`can be downloaded from
`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.
`
`© 1999, 3GPP Organizational Partners (ARIB, CWTS, ETSI, T1, TTA,TTC).
`All rights reserved.
`
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`3
`
`TS 25.301 V3.2.0 (1999-10)
`
`Contents
`Contents ...................................................................................................................................................... 3
`Foreword ..................................................................................................................................................... 5
`1
`Scope ................................................................................................................................................. 6
`2
`References ......................................................................................................................................... 6
`3
`Definitions and Abbreviations ............................................................................................................ 7
`3.1
`Definitions .................................................................................................................................................. 7
`3.2
`Abbreviations .............................................................................................................................................. 7
`4
`Assumed UMTS Architecture ...........................................................................................................10
`5
`Radio interface protocol architecture .................................................................................................12
`5.1
`Overall protocol structure .......................................................................................................................... 12
`5.1.1
`Service access points and service primitives ........................................................................................ 14
`5.2
`Layer 1 Services and Functions ................................................................................................................. 14
`5.2.1
`L1 Services .......................................................................................................................................... 15
`5.2.1.1
`Transport channels ......................................................................................................................... 15
`5.2.2
`L1 Functions ........................................................................................................................................ 16
`5.3
`Layer 2 Services and Functions ................................................................................................................ 16
`5.3.1
`MAC Services and Functions ............................................................................................................... 16
`5.3.1.1
`MAC Services to upper layers ........................................................................................................ 16
`5.3.1.1.1
`Logical channels ....................................................................................................................... 17
`5.3.1.1.1.1
`Control Channels ................................................................................................................. 17
`5.3.1.1.1.2
`Traffic Channels .................................................................................................................. 18
`5.3.1.1.2
`Mapping between logical channels and transport channels ........................................................ 18
`5.3.1.2
`MAC functions ............................................................................................................................... 20
`5.3.2
`RLC Services and Functions ................................................................................................................ 21
`5.3.2.1
`Services provided to the upper layer ............................................................................................... 21
`5.3.2.2
`RLC Functions ............................................................................................................................... 22
`5.3.3
`PDCP Services and Function................................................................................................................ 22
`5.3.3.1
`PDCP Services provided to upper layers ......................................................................................... 22
`5.3.3.2
` PDCP Functions ........................................................................................................................... 23
`5.3.4
`Broadcast/Multicast Control – Services and functions .......................................................................... 23
`5.3.4.1
`BMC Services ................................................................................................................................ 23
`5.3.4.2
`BMC Functions .............................................................................................................................. 23
`5.3.5
`Data flows through Layer 2 .................................................................................................................. 23
`5.3.5.1
`Data flow for BCCH mapped to BCH ............................................................................................. 25
`5.3.5.2
`Data flow for BCCH mapped to FACH .......................................................................................... 25
`5.3.5.3
`Data flow for PCCH mapped to PCH .............................................................................................. 25
`Data flow for SCCH mapped to SCH (ffs.) ..................................................................................... 26
`5.3.5.4
`5.3.5.5
`Data flow for CCCH mapped to FACH/RACH (ffs) ....................................................................... 26
`5.3.5.6
`Data flow for SHCCH mapped to FACH/RACH............................................................................. 26
`5.3.5.7
`Data flow for DCCH mapped to FACH/RACH ............................................................................... 26
`5.3.5.8
`Data flow for DCCH mapped to DSCH .......................................................................................... 26
`5.3.5.9
`Data flow for DCCH mapped to USCH .......................................................................................... 26
`5.3.5.10
`Data flow for DCCH mapped to CPCH .......................................................................................... 26
`5.3.5.11
`Data flow for DTCH (non-transparent RLC) mapped to FACH/RACH ........................................... 26
`5.3.5.12
`Data flow for DTCH (non-transparent RLC) mapped to DSCH ...................................................... 26
`5.3.5.13
`Data flow for DTCH (non-transparent RLC) mapped to USCH ...................................................... 26
`5.3.5.14
`Data flow for DTCH (transparent RLC) mapped to DCH ............................................................... 27
`5.3.5.15
`Data flow for DTCH (non-transparent RLC) mapped to DCH ........................................................ 27
`5.3.5.16
`Data flow for DTCH (non-transparent RLC) mapped to CPCH....................................................... 27
`5.3.5.17
`Data flow for DCCH mapped to DCH ............................................................................................ 27
`5.3.5.18
`Data flow for CTCH mapped to FACH ........................................................................................... 27
`5.4
`Layer 3 – Uu Stratum Services and Functions ........................................................................................... 27
`5.4.1
`Uu Stratum services ............................................................................................................................. 27
`5.4.1.1
`General Control .............................................................................................................................. 27
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`4
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`TS 25.301 V3.2.0 (1999-10)
`
`Notification .................................................................................................................................... 27
`5.4.1.2
`Dedicated Control .......................................................................................................................... 28
`5.4.1.3
`RRC functions ..................................................................................................................................... 28
`5.4.2
`Interactions between RRC and lower layers in the C plane ........................................................................ 31
`5.5
`Protocol termination .................................................................................................................................. 31
`5.6
`Protocol termination for DCH .............................................................................................................. 31
`5.6.1
`Protocol termination for RACH/FACH ................................................................................................ 32
`5.6.2
`Protocol termination for FAUSCH ....................................................................................................... 34
`5.6.3
`Protocol termination for CPCH ............................................................................................................ 34
`5.6.4
`Protocol termination for DSCH ............................................................................................................ 34
`5.6.5
`DSCH definition ............................................................................................................................. 34
`5.6.5.1
`Resource allocation and UE identification on DSCH ...................................................................... 35
`5.6.5.2
`Case A (UE requires a downlink TFCI on a DPCCH) ............................................................... 35
`5.6.5.2.1
`Case B (UE requires a downlink DSCH Control Channel) ......................................................... 35
`5.6.5.2.2
`Case C (UE requires a downlink SHCCH) (TDD only) ............................................................. 36
`5.6.5.2.3
`Model of DSCH in UTRAN .......................................................................................................... 36
`5.6.5.3
`Protocol termination ....................................................................................................................... 36
`5.6.5.4
`Protocol termination for transport channel of type USCH .................................................................... 37
`5.6.6
`USCH definition ............................................................................................................................. 37
`5.6.6.1
`Resource allocation and UE identification on USCH ...................................................................... 38
`5.6.6.2
`Model of USCH in UTRAN .......................................................................................................... 38
`5.6.6.3
`Protocol termination ....................................................................................................................... 38
`5.6.6.4
`Protocol termination for transport channel of type BCH ....................................................................... 39
`5.6.7
`Protocol termination for transport channel of type PCH ....................................................................... 40
`5.6.8
`Protocol termination for transport channel of type SCH ....................................................................... 40
`5.6.9
`Protocol termination for ODCH ........................................................................................................... 40
`5.6.10
`Protocol termination for ORACH ......................................................................................................... 41
`5.6.11
`User Identification and RRC Connection Mobility ............................................................................42
`6
`UE identification on the radio interface ..................................................................................................... 42
`6.1
`UE connection to UTRAN ........................................................................................................................ 43
`6.2
`UE modes .........................................................................................................................................43
`7
`Ciphering ..........................................................................................................................................44
`8
`Location of ciphering function in the UTRAN protocol architecture ......................................................... 44
`8.1
`Input parameters to the ciphering algorithm .............................................................................................. 44
`8.2
`Overview ............................................................................................................................................. 44
`8.2.1
`Ciphering algorithms parameters ......................................................................................................... 44
`8.2.2
`COUNT .......................................................................................................................................... 44
`8.2.2.1
`Ciphering key, CK .......................................................................................................................... 45
`8.2.2.2
`BEARER ........................................................................................................................................ 45
`8.2.2.3
`Direction ........................................................................................................................................ 45
`8.2.2.4
`Length ............................................................................................................................................ 46
`8.2.2.5
`Annex A (informative): Protocol termination ..............................................................................................47
`History........................................................................................................................................................51
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`5
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`TS 25.301 V3.2.0 (1999-10)
`
` Foreword
`This Technical Specification has been produced by the 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 this TS, it will be re-released by the TSG with an
`identifying change of release date and an increase in version number as follows:
`
`Version 3.y.z
`
`where:
`
`x
`
`the first digit:
`
`1 presented to TSG for information;
`
`2 presented to TSG for approval;
`
`3 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 specification.
`
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`6
`
`TS 25.301 V3.2.0 (1999-10)
`
`
`
` 1
`
` Scope
`The present document shall provide an overview and overall description of the UE-UTRAN radio interface protocol
`architecture as agreed within the 3GPP TSG RAN working group 2. Details of the radio protocols will be specified in
`companion documents.
`
`2 References
`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.
`· A non-specific reference to a TS shall also be taken to refer to later versions published as an EN with the same
`number.
`[1] 3GPP TS 23.110: “UMTS Access Stratum; Services and Functions”
`[2] 3GPP TS 25.401: “RAN Overall Description”
`[3] 3GPP TR 25.945: “Vocabulary for the UTRAN”
`
`[4] 3GPP TS 25.302: “Services Provided by the Physical Layer”
`
`[5] 3GPP TS 25.303: “UE Functions and Inter-Layer Procedures in Connected Mode”
`
`[6] 3GPP TS 25.304: “UE Procedures in Idle Mode”
`
`[7] 3GPP TS 25.321: “MAC Protocol Specification”
`
`[8] 3GPP TS 25.322: “RLC Protocol Specification”
`
`[9] 3GPP TS.25.331: “RRC Protocol Specification”
`
`[10] 3GPP TS 25.224: “Physical Layer Procedures (TDD)”
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`7
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`TS 25.301 V3.2.0 (1999-10)
`
` 3
`
`
`
` Definitions and Abbreviations
`3.1 Definitions
`See [3] for a definition of fundamental concepts and vocabulary.
`3.2 Abbreviations
`
`
`ARQ
`
`ASC
`
`
`
`BCCH
`
`BCH
`
`
`
`BMC
`C-
`
`CC
`
`
`
`CCCH
`
`CCH
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
` Automatic Repeat Request
`
` Access Service Class
`
` Broadcast Control Channel
`
` Broadcast Channel
`
` Broadcast/Multicast Control
`
`Control-
`
` Call Control
`
` Common Control Channel
`
` Control Channel
`
`CCTrCH
`
` Coded Composite Transport Channel
`
`CN
`
`
`
`CPCH
`
`CRC
`
`
`
`CTCH
`
`
`
`
`
`
`
`
`
`
`
` Core Network
`
` Common Packet channel
`
` Cyclic Redundancy Check
`
` Common Traffic Channel
`
`
`
` Dedicated Control (SAP)
`
`DC
`
`
`
`DCA
`
`DCCH
`
`DCH
`
`DL
`
`
`
`DRNC
`
`DSCH
`
`DTCH
`
`FACH
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`FAUSCH
`
`FCS
`
`FDD
`
`GC
`
`HO
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
` Dynamic Channel Allocation
`
` Dedicated Control Channel
`
` Dedicated Channel
`
` Downlink
`
` Drift Radio Network Controller
`
` Downlink Shared Channel
`
` Dedicated Traffic Channel
`
`
`
`
`
`
`
`
`
`
`
`Forward Link Access Channel
`
`Fast Uplink Signalling Channel
`
`Frame Check Sequence
`
`Frequency Division Duplex
`
` General Control (SAP)
`
` Handover
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`
`
`
`
`
`ITU
`
`kbps
`
`L1
`
`L2
`
`L3
`
`LAC
`
`LAI
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`MAC
`
`MM
`
`Nt
`
`
`
`
`
`OCCCH
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`International Telecommunication Union
`
`kilo-bits per second
`
` Layer 1 (physical layer)
`
` Layer 2 (data link layer)
`
` Layer 3 (network layer)
`
` Link Access Control
`
` Location Area Identity
`
` Medium Access Control
`
` Mobility Management
`
` Notification (SAP)
`
` ODMA Common Control Channel
`
`ODCCH
`
` ODMA Dedicated Control Channel
`
`ODCH
`
`ODMA
`
`
`
`
`
` ODMA Dedicated Channel
`
` Opportunity Driven Multiple Access
`
`ORACH
`
` ODMA Random Access Channel
`
`ODTCH
`
`PCCH
`
`PCH
`
`
`
`
`
`
`
` ODMA Dedicated Traffic Channel
`
`
`
`
`
`
`
`Paging Control Channel
`
`Paging Channel
`
`Packet Data Convergence Protocol
`
`PDCP
`
`PDU
`
`PU
`
`PHY
`
`
`
`
`
`
`
`PhyCH
`
`RAB
`
`
`
`RACH
`
`RLC
`
`RNC
`
`RNS
`
`
`
`
`
`
`
`RNTI
`
`RRC
`
`SAP
`
`
`
`
`
`SCCH
`
`SCH
`
`SDU
`
`
`
`
`
`SHCCH
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Protocol Data Unit
`
`Payload Unit
`
`Physical layer
`
`Physical Channels
`
` Radio Access Bearer
`
` Random Access Channel
`
` Radio Link Control
`
` Radio Network Controller
`
` Radio Network Subsystem
`
` Radio Network Temporary Identity
`
` Radio Resource Control
`
`
`
`
`
`
`
`
`
`
`
`Service Access Point
`
`Synchronization Control Channel
`
`Synchronization Channel
`
`Service Data Unit
`
`Shared Channel Control Channel
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`SRNC
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`SRNS
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`TCH
`
`TDD
`
`
`
`
`
`TFCI
`
`TFI
`
`
`
`TMSI
`
`TPC
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
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`9
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`
`
`
`
`Serving Radio Network Controller
`
`Serving Radio Network Subsystem
`
` Traffic Channel
`
` Time Division Duplex
`
` Transport Format Combination Indicator
`
` Transport Format Indicator
`
` Temporary Mobile Subscriber Identity
`
` Transmit Power Control
`
`U- User-
`
` User Equipment
`
` User Equipment with ODMA relay operation enabled
`
` Uplink
`
` Universal Mobile Telecommunications System
`
` UTRAN Registration Area
`
` Uplink Shared Channel
`
` UMTS Terrestrial Radio Access
`
` UMTS Terrestrial Radio Access Network
`
`UE
`
`UER
`
`UL
`
`
`
`
`
`
`
`UMTS
`
`URA
`
`USCH
`
`UTRA
`
`UTRAN
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
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` 4
`
` Assumed UMTS Architecture
`Figure 1 shows the assumed UMTS architecture as outlined in TS 23.110 [1]. The figure shows the UMTS
`architecture in terms of its entities User Equipment (UE), UTRAN and Core Network. The respective reference
`points Uu (Radio Interface) and Iu (CN-UTRAN interface) are shown. The figure illustrates furthermore the high-
`level functional grouping into the Access Stratum and the Non-Access Stratum.
`The Access Stratum offers services through the following Service Access Points (SAP) to the Non-Access Stratum:
`• General Control (GC) SAPs,
`• Notification (Nt) SAPs and
`• Dedicated Control (DC) SAPs
`The SAPs are marked with circles in Figure 1.
`
`10
`
`TS 25.301 V3.2.0 (1999-10)
`
`Non-Access Stratum
`
`GC
`
`Nt
`
`DC
`
`GC
`
`Nt
`
`DC
`
`Access Stratum
`UTRAN
`
`UE
`
`Radio
`(Uu)
`Figure 1: Assumed UMTS Architecture
`
`
`Core Network
`
`Iu
`
`
`
`This model can be further refined to distinguish the end AS entities, which provide the services to higher layers, from
`the local entities, which provide services over respectively the Uu and the Iu reference point. Figure 1b presents the
`refined model.
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`11
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`TS 25.301 V3.2.0 (1999-10)
`
`GC
`
`Nt
`
`DC
`
`GC
`
`Nt
`
`DC
`
`
`
`GC
`
`Nt
`
`DC
`
`GC
`
`Nt
`
`DC
`
`GC
`
`Nt
`
`DC
`
`GC
`
`Nt
`
`DC
`
`Relay
`
`Uu Stratum
`
`Iu Stratum
`
`UE
`
`UTRAN
`
`Radio
`(Uu)
`
`Core Network
`
`Iu
`
`Figure 1b: Assumed UTRAN Model
`The Uu Stratum block can be further refined as shown in Figure 1c:
`
`GC
`
`Nt
`
`DC
`
`GC
`
`Nt
`
`DC
`
`RRC
`
`RRC
`
`bearers
`
`RLC/MAC/PHY
`
`RLC/MAC/PHY
`
`UE
`
`UTRAN
`
`Radio
`(Uu)
`
`Figure 1c: Assumed Uu Stratum Model
`
`
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`12
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`TS 25.301 V3.2.0 (1999-10)
`
` 5
`
` Radio interface protocol architecture
`5.1 Overall protocol structure
`The radio interface is layered into three protocol layers:
`•
`the physical layer (L1),
`•
`the data link layer (L2),
`•
`network layer (L3).
`Layer 2 is split into following sublayers: Medium Access Control (MAC), Radio Link Control (RLC), Packet Data
`Convergence Protocol (PDCP) and Broadcast/Multicast Control (BMC).
`Layer 3 and RLC are divided into Control (C-) and User (U-) planes. PDCP and BMC exist in the U-plane only.
`In the C-plane, Layer 3 is partitioned into sublayers where the lowest sublayer, denoted as Radio Resource Control
`(RRC), interfaces with layer 2 and terminates in the UTRAN. The next sublayer, denoted 'Duplication avoidance'
`[TBD], terminates in the CN but is part of the Access Stratum; it provides the Access Stratum Services to higher
`layers.. The higher layer signalling such as Mobility Management (MM) and Call Control (CC) are assumed to
`belong to the non-access stratum, and therefore not in the scope of 3GPP TSG RAN. On the general level, the
`protocol architecture is similar to the current ITU-R protocol architecture, ITU-R M.1035.
`Figure 2 shows the radio interface protocol architecture. Each block in Figure 2 represents an instance of the
`respective protocol. Service Access Points (SAP) for peer-to-peer communication are marked with circles at the
`interface between sublayers. The SAP between MAC and the physical layer provides the transport channels (cf. Sec.
`5.2.1.1). The SAPs between RLC and the MAC sublayer provide the logical channels (cf. Sec. 5.3.1.1.1). In the C-
`plane, the interface between 'Duplication avoidance' and higher L3 sublayers (CC, MM) is defined by the General
`Control (GC), Notification (Nt) and Dedicated Control (DC) SAPs.
`Also shown in the figure are connections between RRC and MAC as well as RRC and L1 providing local inter-layer
`control services. An equivalent control interface exists between RRC and the RLC sublayer, between RRC and the
`PDCP sublayer and between RRC and BMC sublayer. These interfaces allow the RRC to control the configuration of
`the lower layers. For this purpose separate Control SAPs are defined between RRC and each lower layer (PDCP,
`RLC, MAC, and L1). It is assumed that for RLC and MAC one Control SAP each is provided per UE.
`[Note: Control of RLC entities in C and U planes needs to be clarified further. Also, the multiplicity of Control SAPs
`(necessity of one SAP per UE) at the UTRAN side may need to be reconsidered.]
`The RLC sublayer provides ARQ functionality closely coupled with the radio transmission technique used. There is
`no difference between RLC instances in C and U planes.
`The UTRAN can be requested by the CN to prevent all loss of data (i.e. independently of the handovers on the radio
`interface), as long as the Iu connection point is not modified. This is a basic requirement to be fulfilled by the
`UTRAN retransmission functionality as provided by the RLC sublayer.
`However, in case of the Iu connection point is changed (e.g. SRNS relocation, streamlining), the prevention of the
`loss of data may not be guaranteed autonomously by the UTRAN but relies on some functions in the 'Duplication
`avoidance' layer. Such mechanisms to protect from data loss due to SRNS relocation or streamlining are for further
`study.
`[Note: Such mechanisms need to be specified jointly with 3GPP TSGs CN and SA. The implied functionality would be
`applied in the U plane. Applicability in the C plane is for further study.]
`
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`C-plane signalling
`GC
`
`Nt
`
`DC
`
`U-plane information
`
`Duplication avoidance
`
`GC
`
`Nt
`
`DC
`
`L3
`
`control
`
`RRC
`
`UuS boundary
`
`PDCP
`
`PDCP
`
`L2/PDCP
`
`BMC
`
`L2/BMC
`
`control
`control
`
`control
`
`control
`
`RLC
`
`RLC
`
`RLC
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`RLC
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`RLC
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`RLC
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`RLC
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`RLC
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`L2/RLC
`
` MAC
`
`PHY
`
`Logical
`Channels
`
`L2/MAC
`Transport
`Channels
`L1
`
`
`
`Figure 2: Radio Interface protocol architecture (Service Access Points marked by circles)
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`Service access points and service primitives
`5.1.1
`Each layer provides services at Service Access Points (SAPs). A service is defined by a set of service primitives
`(operations) that a layer provides to upper layer(s).
`
`Control services, allowing the RRC layer to control lower layers locally (i.e. not requiring peer-to-peer
`communication) are provided at Control SAPs (C-SAP). Note that C-SAP primitives can bypass one or more
`sublayers, see Figure 2.
`
`In the radio interface protocol specifications, the following naming conventions for primitives shall be applicable:
`
`• Primitives provided by SAPs between adjacent layers shall be prefixed with the name of the service-providing
`layer, i.e. PHY, MAC, RLC, PDCP orUUS.
`• Primitives provided by SAPs to an application shall be prefixed with the name of the service-providing layer, i.e.
`RRC.
`• Primitives provided by Control SAPs, in addition to the name of the service-providing layer, shall be prefixed
`with a “C”, i.e. CPHY, CMAC, CRLC or CPDCP.
`This principle leads to the following notations, where <Type> corresponds to request, indication, response or confirm
`type of primitives:
`
`
`
`
`
`Primitives between PHY and MAC:
`PHY- <Generic name> – <Type>
`
`Primitives between PHY and RRC (over C-SAP):
`CPHY- <Generic name> - <Type>
`
`Primitives between MAC and RLC:
`MAC- <Generic name> - <Type>
`
`Primitives between MAC and RRC (over C-SAP):
`CMAC- <Generic name> - <Type>
`
`Primitives between RLC and upper layers, between RLC and RRC for data transfer and between RLC and PDCP:
`RLC- <Generic name> - <Type>
`
`Primitives between RLC and RRC for control of RLC (over C-SAP):
`CRLC- <Generic name> – <Type>
`
`Primitives above Uu Stratum:
`UUS- <Generic name> – <Type>
`
`Primitives between PDCP and non-access stratum:
`PDCP- <Generic name> - <Type>
`
`Primitives between PDCP and RRC (over C-SAP):
`CPDCP- <Generic name> - <Type>
`
`Primitives between BMC and RRC for control of BMC (over C-SAP):
`CBMC- <Generic name> – <Type>
`
`In this model, some UUS primitives map directly to RLC primitives without intervening function.
`5.2 Layer 1 Services and Functions
`This section shall provide an overview on services and functions provided by the physical layer. A detailed
`description of Layer 1 general requirements can be found in 3GPP TS 25.302 [4].
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` L1 Services
`5.2.1
`The physical layer offers information transfer services to MAC and higher layers. The physical layer transport
`services are described by how and with what characteristics data are transferred over the radio interface. An adequate
`term for this is ‘Transport Channel’1.
`5.2.1.1
`Transport channels
`A general classification of transport channels is into two groups:
`• common transport channels (where there is a need for inband identification of the UEs when particular UEs are
`addressed) and
`• dedicated transport channels (where the UEs are identified by the physical channel, i.e. code and frequency for
`FDD and code, time slot and frequency for TDD).
`Common transport channel types are (a more detailed description can be found in [4]):
`• Random Access Channel (RACH)
`A contention based uplink channel used for transmission of relatively small amount of data, e.g. for initial access
`or non-realtime dedicated control or traffic data.
`• ODMA Random Access Channel (ORACH)
`A contention based channel used in relaylink.
`• Common Packet channel (CPCH)
`
`A contention based channel used for transmission of bursty data traffic. This channel only exists in FDD mode and
`only in the uplink direction. The common packet channel is shared by the UEs in a cell and therefore, it is a
`common resource. The CPCH is fast power controlled.
`
`• Forward Access Channel (FACH)
`Common downlink channel without closed-loop power control used for transmission of relatively small amount
`of data.
`• Downlink Shared Channel (DSCH)
` A downlink channel shared by several UEs carrying dedicated control or traffic data.
`• DSCH Control Channel
` A downlink channel associated with a DSCH used for signalling of DSCH resource allocation.
`[Note: It is for further study whether or not the DSCH Control Channel needs to be regarded as separate
`transport channel type from FACH. Seen from the upper layers, the current requirements are identical to a FACH,
`but some extra L1 information (e.g.TPC bits) may lead to a different physical channel. See Sec. 5.6.5 for a
`description of the DSCH concepts currently considered in TSG-RAN WG2. This section also includes further notes
`on ffs. items related to the DSCH.]
`• Uplink Shared Channel (USCH)
`An uplink channel shared by several UEs carrying dedicated control or traffic data, used in TDD mode only.
`• Broadcast Channel (BCH)
`A downlink channel used for broadcast of system information into an entire cell.
`• Synchronization Channel (SCH)
`A downlink channel used for broad