Release 8
`
`19
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`rviME
`
`NAS
`
`:
`
`UE
`
`_
`
`E eNB
`
`NAS
`RRC
`
`RLC
`MAC
`PHY
`
`RRC
`
`RLC
`MAC
`PHY
`
`Figure 4.3.2-1: Control-plane protocol stack
`
`4.4
`
`Synchronization
`
`Diverse methods and techniques are preferred depending on synchronization requirements. As no single method can
`cover all E-UTRAN applications a logical port at eNB may be used for reception oftiming andfor frequency andtor
`phase inputs pending to the synchronization method chosen.
`
`4.5 IP fragmentation
`
`Fragmentation function in [P layer on S] and X2 shall be supported.
`
`Configuration of'Sl-U (X2-U) link MTU in the eNB/' S-GW according to the MTU of'the network domain the node
`belongs to shall be considered as a choice at network deployment. The network may employ various methods to handle
`IP fraginentation, but the specific methods to use are implementation dependant.
`
`At the establishmentfniodification ofan EPS bearer. the network may signal a value that is to be used as MTU by the
`UE 1P stack (it is FFS how the requirement on the UE should be formulated). It is also FFS ifthe MTU is signalled by
`the MME or the eNB.
`
`5
`
`Physical Layer for E-UTRA
`
`The generic frame structure is illustrated in Figure 5-]. Each I0 ms radio frame is divided into ten equally sized sub-
`frames. Each sub-frame consists oftwo equally sized slots. Each sub-frame can be assigned for either downlink or
`uplink transmission [there are certain res!i'icu'o.rrs in the assigrimenr as r.hefirs! and .s'.t'xt‘h sub-_fi'ame ofeachfiame
`Encizzde the da~.«.'n!'.‘n.’r synchmnirtzrion sfgmrfs]
`
`#0
`
`»»
`
`«2
`
`---------
`
`-1»
`slot
`4-
`4: Sub-frame -I-
`‘tm One radio frame = 10ms T’
`
`Figure 5-1: Generic frame structure
`
`In addition, for coexistence with LCR-TDD, an alternative frame structure illustrated in Figure 5-2 is also supported
`when operating E-UTRA in TDD mode.
`
`3GPP
`
`SAMSUNG 1017-0071
`
`SAMSUNG 1017-0071
`
`

`
`Release 8
`
`20
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`-leOne radio frame = lflmselv
`
`I
`I
`
`r
`
`g
`
`#0
`
`#1
`
`#2
`
`#3
`
`#4
`
`#5
`
`‘Jr;
`
`DWPTS
`
`T UpPTS
`
`Guard period
`
`Figure 5-2: alternative frame structure
`
`The physical channels oi'E-UTRA are:
`
`Physical broadcast channel (PBCH)
`
`- The coded BCH transport block is mapped to four subframes within a 40 ms interval;
`
`-
`
`-
`
`40 ms timing is blindly detected. ie. there is no explicit signalling indicating 40 ms timing;
`
`Each subframe is assumed to be self-decodable, i.e. the BCH can be decoded from a single reception.
`assuming sufficiently good channel conditions.
`
`Physical control format indicator channel (PCFICH)
`
`-
`
`Informs the UE about the number of OFDM symbols used for the PDCCHs;
`
`- Transmitted in every subframe.
`
`Physical downlink control channel (PDCCH)
`
`-
`
`Informs the UE about the resource allocation of PCH and DL-SCH. and Hybrid ARQ information related to
`DL-SCH;
`
`- Carries the uplink scheduling grant.
`
`Physical Hybrid ARQ Indicator Channel {PHlCH)
`
`- Carries Hybrid ARQ ACKENAKS in response to uplink transmissions.
`
`Physical downlink shared channel (PDSCH}
`
`- Carries the DL-SCH and PCH.
`
`Physical multicast channel (PMCH)
`
`- Carries the MCH.
`
`Physical uplink control channel (PUCCH)
`
`- Carries Hybrid ARQ ACKINAKS in response to downlink transmission;
`
`- Carries Scheduling Request {SR};
`
`- Carries CQI reports.
`
`Physical uplink shared channel (PUSCH)
`
`- Carries the UL-SCH.
`
`Physical random access channel (PRACH)
`
`- Carries the random access preamble.
`
`3GPP
`
`SAMSUNG 1017-0072
`
`

`
`Release 8
`
`21
`
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`
`5.1
`
`Downlink Transmission Scheme
`
`5.1.1
`
`Basic transmission scheme based on OFDM
`
`The downlink transmission scheme is based on conventional OFDM using a cyclic prefix. The OFDM sub-carrier
`spacing is Af= [5 kHz. [2 consecutive sub-carriers during one slot correspond to one downlink res-om-ce blrrck. In the
`frequency domain, the number of resource blocks, NR3, can range from N.m_,,.,-.. = 6 to NW...“ = [1 I0].
`
`In addition there is also a reduced sub-carrier spacingAf;m., = ?.5 kHz. only for MBMS-dedicated cell.
`
`ln the case of IS kHz sub-carrier spacing there are two cyclic-prefix lengths, corresponding to seven and six OFDM
`symbols per slot respectively.
`
`- Normal cyclic prefix: Tfp = l60><Ts (OFDM symbol #0) , Tfp = l44><Ts {OFDM symbol #1 to #6)
`
`-
`
`Extended cyclic prefix: T(_~p_,, = 5 I 2><Ts (OFDM symbol #0 to OFDM symbol #5)
`
`where T5 = li’(20-=18 >< Af)
`
`In case of?.S kHz sub~carrier spacing. there is only a single cyclic prefix length T‘-M“. = l024><Ts, corresponding to 3
`OFDM symbols per slot.
`
`in case of FDD, operation with halfduplex from UE point of view is supported.
`
`For operation in unpaired spectrum with generic frame structure. DUUL switching points are generated by not
`transmitting in certain symbols while idle periods, required by the Node B at ULXDL switching points are created using
`time advance rnechanism. For the alternative frame structure, the cyclic prefix length, in case of I 5 kHz sub-carrier
`spacing, is
`
`- Normal cyclic prefix: T(_‘p = 224xTs (OFDM symbol #0 to #8)
`
`-
`
`Extended cyclic prefix: T(']2|_c = 5l2xTs [OFDM symbol #0 to it?)
`
`5.1.2
`
`Physical-layer processing
`
`The downlink physical-layer processing oftransport channels consists ofthe following steps:
`
`- CRC insertion: 24 bit CRC is the baseline for PDSCH;
`
`- Channel coding: Turbo coding based on OPP inner interleaving with trellis termination;
`
`-
`
`Physical-layer hybrid-ARQ processing;
`
`- Channel interleaving;
`
`-
`
`Scrambling: transport-channel specific scrambling on DL-SCH. BCH. and PCH. Common MCH scrambling for
`all cells involved in a specific MBSFN transmission;
`
`- Modulation: QPSK, l6QAM, and 6-=$QAM;
`
`-
`
`Layer mapping and pre-coding;
`
`- Mapping to assigned resources and antenna ports.
`
`5.1.3
`
`Physical downlink control channel
`
`The downlink control signalling {PDCCH) is located in the first in OFDM symbols where n 3 3 and consists of:
`
`- Transport fonnal, resource allocation, and hybrid-ARQ information related to DL-SCH, and PCH;
`
`- Transport format, resource allocation, and hybrid-ARQ information related to UL-SCH;
`
`Transmission ofcontrol signalling from these groups is mutually independent.
`
`3GPP
`
`SAMSUNG 1017-0073
`
`SAMSUNG 1017-0073
`
`

`
`Release 8
`
`22
`
`3C-SPF TS 36.300 VB.4.0 (2008-03]
`
`Multiple physical downlink control channels are supported and a UE monitors a set ofcontrol channels.
`
`Control channels are formed by aggregation ofcontrol channel elements, each control channel element consisting ofa
`set of resource elements. Different code rates for the control channels are realized by aggregating different numbers of
`control channel elements.
`
`QPSK modulation is used for all control channels.
`
`Each separate control channel has its own set of x-RNTI.
`
`There is an implicit relation between the uplink resources used for dynamically scheduled data transmission. or the DL
`control channel used for assignment, and the downlink ACK/NAK resource used for feedback
`
`5.1.4
`
`Downlink Reference signal
`
`The downlink reference signals consist ofknown reference symbols inserted in the first and third last OFDM symbol of
`each slot. There is one reference signal transmitted per downlink antenna port. The number of downlink antenna ports
`equals I, 2, or 4. The two-dimensional reference signal sequence is generated as the symbol-by-symbol product of a
`two-dimensional orthogonal sequence and a two-dimensional pseudo-random sequence. There are 3 different two-
`dimensional orthogonal sequences and 170 different two-dimensional pseudo-random sequences. Each cell identity
`corresponds to a unique combination of one orthogonal sequence and one pseudo-random sequence, thus allowing for
`5| 0 unique cell identities I70 cell identity groups with 3 cell identities in each group).
`
`Frequency hopping can be applied to the downlink reference signals. The frequency hopping pattern has a period ofone
`frame (10 ms). Each frequency hopping pattern corresponds to one cell identity group.
`
`The downlink MBSFN reference signals consist of known reference symbols inserted every other sub-carrier in the 3rd,
`‘fth and 11th OFDM symbol ofsub-frame in case of I 5kHz sub-carrier spacing and extended cyclic prefix
`
`5.1.5
`
`Downlink multi-antenna transmission
`
`Multi-antenna transmission with 2 and 4 transmit antennas is supported. The maximum number ofcodeword is two
`irrespective to the number of antennas with fixed mapping between code words to layers.
`
`Spatial division multiplexing (SDM) of multiple modulation symbol streams to a single UE using the same time-
`frequency (-code) resource, also referred to as Single-User MIMO (SU-MIMO] is supported. When a MIMO channel is
`solely assigned to a single UE. it is known as SU-MIMO. Spatial division multiplexing of modulation symbol streams
`to different UES using the same time-frequency resource, also referred to as MU-MIMO. is also supported. There is
`semi-static switching between SU-MIMO and MU-MIMO per UE.
`
`In addition. the following techniques are supported:
`
`- Code-book-based pre-coding with a single pre-codin g feedback per full system bandwidth when the system
`bandwidth {or subset ofresource blocks) is smaller or equal tol ZRB and per 5 adjacent resource blocks or the
`full system bandwidth (or subset of resource blocks} when the system bandwidth is larger than IZRB.
`
`- Rank adaptation with single rank feedback referring to full system bandwidth. Node B can override rank report.
`
`5.1.6
`
`MBSFN transmission
`
`MBSFN is supported for the MCH transport channel. Multiplexing oftransport channels using MBSFN and non-
`MBSFN transmission is done on a per-sub-frame basis. Additional reference symbols. transmitted using MBSFN are
`transmitted within MBSFN subframes.
`
`5.1.7
`
`Physical layer procedure
`
`5.1.7.1
`
`Link adaptation
`
`Link adaptation (AMC: adaptive modulation and coding) with various modulation schemes and channel coding rates is
`applied to the shared data channel. The same coding and modulation is applied to all groups of resource blocks
`belonging to the same L2 PDU scheduled to one user within one TTl and within a single stream.
`
`3GPP
`
`SAMSUNG 1017-0074
`
`SAMSUNG 1017-0074
`
`

`
`Release 8
`
`23
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`5.1.7.2
`
`Power Control
`
`Downlink power control can be used.
`
`5.1.7.3
`
`Cell search
`
`Cell search is the procedure by which a UE acquires time and frequency synchronization with a cell and detects the Cell
`ID ofthat cell. E-UTRA cell search supports a scalable overall transmission bandwidth corresponding to 72 sub-carriers
`and upwards.
`
`E-UTRA cell search is based on following signals transmitted in the downlink: the primary and secondary
`synchronization signals, the downlink reference signals.
`
`The primary and secondary synchronization signals are transmitted over the centre 72 sub-carriers in the first and sixth
`subframe of each frame.
`
`Neighbour-cell search is based on the same downlink signals as initial cell search.
`
`5.1.8
`
`Physical layer measurements definition
`
`The physical layer measurements to support mobility are classified as:
`
`- within E-UTRAN {intra-frequency, inter-frequency);
`
`-
`
`-
`
`between E-UTRAN and GERANEUTRAN {inter-RAT);
`
`between E-UTRAN and non-BGPP RAT (lnter 3GPP access system mobility).
`
`For measurements within E-UTRAN at least two basic UE measurement quantities shall be supported:
`
`- Reference symbol received power (RSRP};
`
`-
`
`E-UTRA carrier received signal strength indicator {RSSl).
`
`5.2
`
`Uplink Transmission Scheme
`
`5.2.1
`
`Basic transmission scheme
`
`For both FDD and TDD. the uplink transmission scheme is based on single-carrier FDMA, more specifically DFTS-
`OFDM.
`
`
`
`CP
`.
`.
`insertion
`
`.
`carrier
`
`Figure 5.2.1-1: Transmitter scheme of SC-FDMA
`
`The uplink sub—carrier spacing Af = I5 kHz. The sub-carriers are grouped into sets of I2 consecutive sub-carriers.
`corresponding to the uplink resource blocks. I2 consecutive sub-carriers during one slot correspond to one uplink
`resotirce bi’oc'i’c. In the frequency domain, the number of resource blocks, N“. can range from NRH_.,.;,. = 6 to NR3_.,,a, =
`[I I0].
`
`There are two cyclic-prefix lengths defined: Normal cyclic prefix and extended cyclic prefix corresponding to seven
`and six SC-FDMA symbol per slot respectively.
`
`- Normal cyclic prefix: T9,. = l60><Ts (SC-FDMA symbol #0) . T9]. = l44xTs (SC-FDMA symbol #1 to #6}
`
`-
`
`Extended cyclic prefix: T.;p.,, = 5l2><Ts (SC-FDMA symbol #0 to SC-FDMA symbol #5)
`
`Correspondingly. for the alternative frame structure, the cyclic prefix length is listed in table 5.2.]-l.
`
`3GPP
`
`SAMSUNG 1017-0075
`
`SAMSUNG 1017-0075
`
`

`
`Release 8
`
`24
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`Table 5.2.1-1: Cyclic prefix length for alternative frame structure
`
`
`- CRC insertion: 24 bit CRC is the baseline for PUSCH;
`
`5.2.2
`
`Physica|—|ayer processing
`
`The uplink physical layer processing oftransport channels consists ofthe following steps:
`
`- Channel coding: turbo coding based on QPP inner interleaving with trellis tennination;
`
`-
`
`-
`
`Physical-layer hybrid-ARQ processing;
`
`Scrambling: UE-specific scrambling;
`
`- Modulation: QPSK, l6QAM. and 64QAM (64 QAM optional in UE):
`
`- Mapping to assigned resources [and ontemras].
`
`5.2.3
`
`Physical uplink control channel
`
`The PUCCH shall be mapped to a control channel resource in the uplink. A control channel resource is defined by a
`code and two resource blocks, consecutive in time, with hopping at the slot boundary.
`
`Depending on presence or absence ofuplinlc timing synchronization. the uplink physical control signalling can differ.
`
`In the case oftime synchronization being present, the outband control signalling consists of:
`
`- CQI;
`
`- ACKINAK:
`
`-
`
`Scheduling Request (SR).
`
`The CQI informs the scheduler about the current channel conditions as seen by the UE. lfM|MO transmission is used.
`the CQI includes necessary MIMO-related feedback.
`
`The HARQ feedback in response to downlink data transmission consists ofa single ACKJNAK bit per HARQ process.
`
`PUCCH resources for SR and CQI reporting are assigned and can be revoked through RRC signalling. An SR is not
`necessarily assigned to UEs acquiring synchronization through the RACH [i.e. synchronised UEs may or may not have
`a dedicated SR channel}. PUCCH resources for SR and C0] are lost when the UE is no longer synchronized.
`
`5.2.4
`
`Uplink Reference signal
`
`Uplink reference signals [for channel estimation for coherent demodulation] are transmitted in the 4-th block ofthe slot
`[assumed normm’ CP]. The uplink reference signals sequence length equals the size {number of sub-carriers) ofthe
`assigned resource.
`
`3GPP
`
`SAMSUNG 1017-0076
`
`SAMSUNG 1017-0076
`
`

`
`Release 8
`
`25
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`The uplink reference signals are based on [prime-iewgrh] Zadoff-chu sequences that are either truncated or cyclically
`extended to the desired length
`
`Multiple reference signals can be created:
`
`- Based on different Zadoff-Chu sequence from the same set of Zadoff-Chu sequences;
`
`- Different shifts ofthe same sequence.
`
`5.2.5
`
`Random access preamble
`
`The physical layer random access burst consists ofa cyclic prefix, a preamble, and a guard time during which nothing is
`transmitted.
`
`The random access preambles are generated from Zadoff-Chu sequences with zero correlation zone, ZC-ZCZ,
`generated from one or several root Zadoff‘-Chu sequences.
`
`5.2.6
`
`Uplink multi-antenna transmission
`
`The baseline antenna configuration for uplink MIMO is MU-MIMO. To allow for MU-MIMO reception at the Node B,
`allocation ofthe same time and frequency resource to several UES, each ofwhich transmitting on a single antenna, is
`supported.
`
`Closed loop type adaptive antenna selection transmit diversity shall be supported for FDD (optional in UE).
`
`5.2.?
`
`Physical channel procedure
`
`5.2.7.1
`
`Link adaptation
`
`Uplink link adaptation is used in order to guarantee the required rninirnum transmission performance of each UE such
`as the user data rate. packet error rate. and latency. while maximizing the system throughput.
`
`Three types oflink adaptation are performed according to the channel conditions, the UE capability such as the
`maximum transmission power and maximum transmission bandwidth etc., and the required QoS such as the data rate,
`latency, and packet error rate etc. Three link adaptation methods are as follows.
`
`- Adaptive transmission bandwidth;
`
`- Transmission power control;
`
`- Adaptive modulation and channel coding rate.
`
`5.2.7.2
`
`Uplink Power control
`
`lntra-cell power control: the power spectral density ofthe uplirik transmissions can be influenced by the eNB.
`
`5.2.7.3
`
`Uplink timing control
`
`The timing advance is derived from the UL received timing and sent by the eNB to the UE which the UE uses to
`advanceldelay its timings oftransmissions to the eNB so as to compensate for propagation delay and thus time align the
`transmissions from different UEs with the receiver window of the eNB.
`
`The timing advance command is on a per need basis with a granularity in the step size of0.52 its (I6xT,).
`
`5.3
`
`Transport Channels
`
`The physical layer offers infonnation 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".
`
`3GPP
`
`SAMSUNG 1017-0077
`
`SAMSUNG 1017-0077
`
`

`
`Release 8
`
`26
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`NOTE:
`
`This should be clearly separated from the classification ofwhm‘ is transported, which relates to the
`concept oflogical channels at MAC sublayer.
`
`Downlink transport channel types are:
`
`1. Broadcast Channel (BCH) characterised by:
`
`-
`
`-
`
`fixed, pre-defined transport format;
`
`requirement to be broadcast in the entire coverage area of‘ the cell.
`
`2. Downlink Shared Channel (DL-SCH) characterised by:
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
`-
`
`support for HARQ;
`
`support for dynamic link adaptation by varying the modulation, coding and transmit power;
`
`possibility to be broadcast in the entire cell;
`
`possibility to use beamforming;
`
`support for both dynamic and semi-static resource allocation;
`
`support for UE discontinuous reception {DRX) to enable UE power saving;
`
`support for MBMS transmission.
`
`NOTE:
`
`the possibility to use slow power control depends on the physical layer.
`
`3. Paging Channel (PCH) characterised by:
`
`—
`
`-
`
`support for UE discontinuous reception (DRX) to enable UE power saving {DRX cycle is indicated by the
`network to the UE);
`
`requirement to be broadcast in the entire coverage area of the cell;
`
`- mapped to physical resources which can be used dynamically also for trafficfother control channels.
`
`4. Multicast Channel (MCH) characterised by:
`
`-
`
`-
`
`-
`
`requirement to be broadcast in the entire coverage area of the cell;
`
`support for MBSFN combining of MBMS transmission on multiple cells;
`
`support for semi-static resource allocation e.g. with a time frame ofa long cyclic prefix.
`
`Uplink transport channel types are:
`
`I. Uplink Shared Channel (UL-SCH) characterised by:
`
`—
`
`-
`
`-
`
`-
`
`possibility to use beamforming; (likely no impact on specifications)
`
`support for dynamic link adaptation by varying the transmit power and potentially modulation and coding;
`
`support for HARQ;
`
`support for both dynamic and semi-static resource allocation.
`
`NOTE:
`
`the possibility to use uplink synchronisation and timing advance depend on the physical layer.
`
`2. Random Access Channel(s) (RACH) characterised by:
`
`-
`
`-
`
`limited control information;
`
`collision risk;
`
`NOTE:
`
`the possibility to use open loop power control depends on the physical layer solution.
`
`3GPP
`
`SAMSUNG 1017-0078
`
`SAMSUNG 1017-0078
`
`

`
`Release 8
`
`27
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`5.3.1
`
`Mapping between transport channels and physical channels
`
`The figures below depict the mapping between transport and physical channels:
`
`__
`
`BCH
`-
`<'
`
`PCH
`MCH
`_______ __r— _______ __,r*-
`K‘ >
`\“'“"\'}
`\\
`\
`
`DL-SCH
`______ __
`— ______________ __
`{ID
`If
`/
`
`I
`/
`Xx
`-—
`—
`AL
`~<_>aaaaaaa~<_>aaaaaaaaaaaaaa~<_>aaaaaaaaasac.»aaaa as
`PBCH
`PMCH
`PDSCH
`PDCCH
`
`\
`‘
`
`if
`I‘
`D
`""77 -‘*7
`Tram'_.='Jm'! cJ'mnrrel'.\‘
`
`it
`ll‘
`D ‘
`.,;;:t.*,:.:;
`'_
`I
`
`Figure 5.3.1-1: Mapping between downlink transport channels and downlink physical channels
`
`UL-SCH
`
`RACH
`
`_____f“}_________<_—_)___________________ __ U-"’””‘f‘
`Tl'(J'fI.S'f}rJl"f chcrrrnefs
`
`—
`_
`'""C__} """ "(:3"""" "C__> ““ “
`PUSCH
`PEACH
`PUCCH
`
`Lflralink
`)
`I
`Pl‘.'_1».s.'-wt’ r.l'1annu'.s
`
`I
`
`Figure 5.3.1-2: Mapping between uplink transport channels and uplink physical channels
`
`5.4
`
`E-UTRA physical layer model
`
`The E-UTRAN physical layer model is captured in TS 36.302
`
`5.4.1
`
`Void
`
`5.4.2
`
`Void
`
`6
`
`Layer 2
`
`Layer 2 is split into the following sublayersz Medium Access Control (MAC), Radio Link Control (RLC} and Packet
`Data Convergence Protocol {PDCP).
`
`This subclause gives a high level description ofthe Layer 2 sub-layers in terms of services and functions. The two
`figures below depict the PDCPFRLCIMAC architecture for downlink and uplink, where:
`
`-
`
`Service Access Points (SAP) for peer-to-peer communication are marked with circles at the interface between
`sublayers. The SAP between the physical layer and the MAC sublayer provides the transport channels. The
`SAPS between the MAC sublayer and the RLC sublayer provide the logical channels.
`
`- The multiplexing of several logical channels (i.e. radio bearers) on the same transport channel {i.e. transport
`block) is performed by the MAC sublayer;
`
`3GPP
`
`SAMSUNG 1017-0079
`
`SAMSUNG 1017-0079
`
`

`
`Release 8
`
`28
`
`3C-EPP TS 36.300 VB.4.0 (2008-03)
`
`-
`
`In both uplink and downlink, only one transport block is generated per TTI in the non-MIMO case.
`
`5
`PDCP =1‘
`5
`
`ROHC
`
`ROHC
`
`Security |
`
`Security |
`
`_
`
`ROHC
`I
`Security
`
`| ROHC
`_
`I
`| Security
`
`AR0 910
`
`BCCH
`
`PCCH
`
`-----
`
`----------------
`
`'
`
`MAC
`
`\ Multiplexing UE1 /
`
`-------- Logical Channels ------{J13----------------
`Scheduling I Priority Handling
`I
`I
`I
`\|'v1u|tip|exing UE,./
`
`---------------
`
`----------------------
`I
`
`HARD
`
`HARO
`
`ilk._____________________C]i‘)________________. TransportCl-la.-me|s
`
`____________"Cl:_________________________"C13________C_:;,________
`
`Figure 6-1: Layer 2 Structure for DL
`
`Ii
`
`————————————- Radio Bearers
`
`ROHC MAC
`
`------------------------ Transport Channels
`
`Figure 6-2: Layer 2 Structure for UL
`
`6.1
`
`MAC Sublayer
`
`This subelause provides an overview on services and functions provided by the MAC sublayer.
`
`3GPP
`
`SAMSUNG 1017-0080
`
`

`
`Release 8
`
`29
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`6.1.1
`
`Services and Functions
`
`The main services and functions ofthe MAC sublayer include:
`
`- Mapping between logical channels and transport channels;
`
`- Multiplexingfdemultiplexing of RLC PDUs belonging to one or different radio bearers intolfrom transport blocks
`(TB) delivered toffrom the physical layer on transport channels;
`
`- Traffic volume measurement reporting;
`
`-
`
`-
`
`-
`
`Error correction through HARQ;
`
`Priority handling between logical channels ofone UE;
`
`Priority handling between UEs by means of dynamic scheduling;
`
`- Transport fonnat selection;
`
`-
`
`Padding.
`
`6.1.2
`
`Logical Channels
`
`Different kinds ofdata transfer services as offered by MAC. Each logical channel type is defined by what type of
`information is transferred.
`
`A general classification oflogical channels is into two groups:
`
`- Control Channels {for the transfer ofcontrol plane information);
`
`- Traffic Channels (for the transfer ofuser plane information).
`
`There is one MAC entity per cell. MAC generally consists of several function blocks (transmission scheduling functions,
`per UE functions, MBMS functions, MAC control functions, transport block generation.. .}. Transparent Mode is only
`applied to BCCH. CCCH and PCCH.
`
`6.1.2.1
`
`Control Channels
`
`Control channels are used for transfer of control plane information only. The control channels offered by MAC are:
`
`- Broadcast Control Channel (BCCH)
`
`A downlink channel for broadcasting system control information.
`
`-
`
`Paging Control Channel (PCCH)
`
`A downlink channel that transfers paging information. This channel is used when the network does not know the
`location cell ofthe UE.
`
`- Common Control Channel (CCCH)
`
`Channel for transmitting control information between UEs and network. This channel is used for UEs having no
`RRC connection with the network.
`
`- Multicast Control Channel (MCCH)
`
`A point-to-multipoint downlink channel used for transmitting MBMS control information from the network to
`the UE, for one or several MTCHS. This channel is only used by UEs that receive MBMS.
`
`NOTE:
`
`It is FFS how MBMS scheduling is transmitted by either L213 signalling on MCCH or L] signalling.
`
`- Dedicated Control Channel (DCCH)
`
`A point-to-point bi-directional channel that transmits dedicated control information between a UE and the
`network. Used by UEs having an RRC connection.
`
`3GPP
`
`SAMSUNG 1017-0081
`
`SAMSUNG 1017-0081
`
`

`
`Release 8
`
`30
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`6.1.2.2
`
`Traffic Channels
`
`Traffic channels are used for the transfer of user plane information only. The traffic channels offered by MAC are:
`
`- Dedicated Traffic Channel (DTCH)
`
`A Dedicated Traffic Channel (DTCH) is a point-to-point channel, dedicated to one UE. for the transfer of user
`information. A DTCH can exist in both uplink and downlink.
`
`- Multieast Traffic Channel {MTCH)
`
`A point-to-multipoint downlink channel for transmitting traffic data from the network to the UE. This channel is
`only used by UEs that receive MBMS.
`
`6.1.3
`
`Mapping between logical channels and transport channels
`
`6.1.3.1
`
`Mapping in Uplink
`
`The figure below depicts the mapping between uplink logical channels and uplink transport channels:
`
`CCCH
`
`DCCH
`
`DTCH
`
`____C
`
`.
`I
`(plmk
`
`Logical c'I'3amreI'.s' Upffnk
`
`RAC H
`
`U L-S CH
`
`Transport clralrriefs
`
`Figure 6.1.3.1-1: Mapping between uplink logical channels and uplink transport channels
`
`In Uplink, the following connections between logical channels and transport channels exist:
`
`- CCCH can be mapped to UL-SCH;
`
`- DCCH can be mapped to UL- SCH;
`
`- DTCH can be mapped to UL-SCH.
`
`6.1.3.2
`
`Mapping in Downllnk
`
`The figure below depicts the mapping between downlink logical channels and downlink transport channels:
`
`PCCH
`
`BCCH
`
`CCCH
`
`DCCH
`
`DTCH
`
`MCCH
`
`MTCH
`
`C‘)
`
`—
`Q
`PCH
`
`}
`
`D
`
`
`
`BCH
`
`DL-SCH
`
`MCH
`
`Dr)wnl.='mlr
`Lrigical c‘har.*.>'.-'ez’.s'
`
`Drjwnlink
`Trcmsporr clmnneis
`
`Figure 6.1.3.2-1: Mapping between downlink logical channels and downlink transport channels
`
`3GPP
`
`SAMSUNG 1017-0082
`
`SAMSUNG 1017-0082
`
`

`
`Release 8
`
`31
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`In Downlink, the following connections between logical channels and transport channels exist:
`
`- BCCH can be mapped to BCH;
`
`- BCCH can be mapped to DL-SCH;
`
`-
`
`PCCH can be mapped to PCH;
`
`- CCCH can be mapped to DL-SCH;
`
`- DCCH can be mapped to DL-SCH;
`
`- DTCH can be mapped to DL-SCH;
`
`- MTCH can be mapped to DL-SCH;
`
`- MTCH can be mapped to MCH;
`
`- MCCH can be mapped to DL--SCH;
`
`- MCCH can be mapped to MCH.
`
`6.2
`
`RLC Sublayer
`
`This subclause provides an overview on services, functions and PDU structure provided by the RLC sublayer. Note
`that:
`
`- The reliability of RLC is configurable: some radio bearers may tolerate rare losses (e.g. TCPtrafi'1c):
`
`- Radio Bearers are not characterized by a fixed sized data unit (e.g. a fixed sized RLC PDU].
`
`6.2.1
`
`Services and Functions
`
`The main services and functions ofthe RLC sublayer include:
`
`- Transfer of upper layer PDUs supporting AM or UM;
`
`TM data transfer:
`
`-
`
`-
`
`Error Correction through ARQ {CRC check provided by the physical layer, in other words no CRC needed at
`RLC‘ level);
`
`Segmentation according to the size ofthe TB: only ifan RLC SDU does not fit entirely into the TB then the
`RLC SDU is segmented into variable sized RLC PDUs. which do not include any padding;
`
`- Re-segmentation of PDUs that need to be retransmitted: ifa retransmitted PDU does not fit entirely into the new
`TB used for retransmission then the RLC PDU is re-segmented;
`
`- The number ofre-segmentations is not limited;
`
`- Concatenation of SDUs for the same radio bearer;
`
`-
`
`[n-sequence delivery of upper layer PDUs except at HO;
`
`- Dupticate Detection;
`
`-
`
`-
`
`Protocol error detection and recovery;
`
`SDU discard;
`
`- Reset.
`
`6.2.2
`
`PDU Structure
`
`Figure 6.2.2-1 below depicts the RLC PDU structure where:
`
`3GPP
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`SAMSUNG 1017-0083
`
`

`
`Release 8
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`32
`
`3GPP TS 36.300 vs.-1.0 (2008-03}
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`- The PDU sequence number carried by the RLC header is independent ofthe SDU sequence number {i.e. PDCP
`sequence number);
`
`- A red dotted line indicates the occurrence of segmentation;
`
`- Because segmentation only occurs when needed and concatenation is done in sequence, the content of an RLC
`PDU can generally be described by the following relations:
`
`-
`
`-
`
`{0; I} last segment of SDU. + [0; n] complete SDUs + {0; I} first segment of SDU.+,.... : or
`
`1 segment ofSDU;.
`
`RLC SDU
`
`n
`
`n+1
`
`n+2
`
`n+3
`
`RLC header
`
`|\‘.I E‘.
`
`l‘-I-.E':('|
`
`l-«GTRLC PDI
`
`Figure 6.2.2-1: RLC PDU Structure
`
`6.3
`
`PDCP Sublayer
`
`This subclause provides an overview on services, functions and PDU structure provided by the PDCP sublayer.
`
`6.3.1
`
`Services and Functions
`
`The main services and functions ofthe PDCP sublayer for the user plane include:
`
`- Header compression and decompression: ROHC only;
`
`- Transfer of user data: transmission of user data means that PDCP receives PDCP SDU from the NAS and
`
`forwards it to the RLC layer and vice versa;
`
`-
`
`ln-sequence delivery of upper layer PDUS at handover for RLC AM;
`
`- Duplicate detection of lower layer SDUs at handover for RLC AM;
`
`- Retransmission of PDCP SDUs at handover for RLC AM;
`
`- Ciphering;
`
`-
`
`Timer—basccl SDU discard in uplink.
`
`NOTE: When compared to UTRAN, the !o.vsies.-a- Dr’. R.-'.(‘ PDUs:':e change is not required.
`
`The main services and functions ofthe PDCP for the control plane include:
`
`- Ciphering and Integrity Protection;
`
`- Transfer ofcontrol plane data: transmission ofcontrol plane data means that PDCP receives PDCP SDUs from
`RRC and forwards it to the RLC layer and vice versa.
`
`3GPP
`
`SAMSUNG 1017-0084
`
`SAMSUNG 1017-0084
`
`

`
`Release 8
`
`33
`
`3C-SPF TS 36.300 VB.4.0 (2008-03}
`
`6.3.2
`
`PDU Structure
`
`Figure 6.3.2-1 below depicts the PDCP PDU structure where:
`
`-
`
`-
`
`PDCP PDU and PDCP header are octet-aligned;
`
`PDCP header can be either 1 or 2 bytes long.
`
`PDCP SDU
`I PDCP header
`Repose PDU
`
`Figure 6.3.2-1: PDCP PDU Structure
`
`6.4
`
`Data flows through Layer 2
`
`7
`
`RRC
`
`This subclause provides an overview on services and functions provided by the RRC sublayer.
`
`7.1
`
`Services and Functions
`
`The main services and functions ofthe RRC sublayer include:
`
`- Broadcast of‘ System Information related to the non-access stratum (NAS};
`
`- Broadcast of System Information related to the access stratum {AS};
`
`-
`
`-
`
`Paging;
`
`Establishment, maintenance and release of an RRC connection between the UE and E-UTRAN including:
`
`- Allocation oftemporary identifiers between UE and E-UTRAN;
`
`- Configuration of signalling radio bearer(s} for RRC connection:
`
`-
`
`Low priority SRB and high priority SRB.
`
`-
`
`Security functions including key management;
`
`- Establishment,configuration.maintenance and release of point to point Radio Bearers;
`
`- Mobility functions including:
`
`- UE measurement reporting and control ofthe reporting for inter-cell and inter-RAT mobility;
`
`-
`
`Inter-cell handover;
`
`- UE cell selection and reselection and control ofcell selection and reselection;
`
`- Context transfer between eNBs.
`
`- Notification for MBMS services;
`
`3GPP
`
`-
`
`Establishment, configuration. maintenance and release of Radio Bearers for MBMS services;
`
`- QoS management functions;
`
`SAMSUNG 1017-0085
`
`

`
`Release 8
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`34
`
`3C-SPF TS 36.300 VB.4.0 (2008-03]
`
`- UE measurement reporting and control of the reporting;
`
`- NAS direct message transfer toffrom NAS fromfto UE.
`
`7.2
`
`RRC protocol states & state transitions
`
`RRC uses the following states:
`
`- RRC_IDLE:
`
`-
`
`PLMN selection;
`
`- DRX configured by NAS (Option to have UE specific DRX is FFS);
`
`- Broadcast of system information;
`
`-
`
`Paging;
`
`- Cell re-selection mobility:
`
`- The UE shall have been allocated an id which uniquely identifies the UE in a tracking area;
`
`- No RRC context stored in the el\|B.
`
`- RRC_CONNECTED:
`
`- UE has an E-UTRAN-RRC connection;
`
`- UE has context in E-UTRAN;
`
`- E-UTRAN knows the cell which the UE belongs to;
`
`- Network can transmit andfor receive data toffront UE;
`
`- Network controlled mobility (handover and inter-RAT cell change order to GERAN with NACC);
`
`- Neighbour cell measurements;
`
`- At PDCPIRLCIMAC level:
`
`- UE can transmit andfor receive data toffrom network;
`
`- UE monitors control signalling channel for shared data channel to see if any transmission over the shared
`data channel has been allocated to the UE;
`
`- UE also reports channel quality information and feedback information to eNEl;
`
`- DRX period can be configured according to UE activity level for UE power saving and efticient resource
`utilization. This is under control ofthe eNB.
`
`7.3
`
`Transport of NAS messages
`
`In E-