For the purposes of the present document, the terms and definitions given in [3] and the following apply: E-DCH active set (FDD only): Serving E-DCH cell: Serving E-DCH RLS or Serving RLS (FDD only): Non-serving E-DCH RL or Non-serving RL (FDD only): Primary downlink frequency: Secondary downlink frequency: Activated uplink frequency: Configured uplink frequency: Primary uplink frequency: Secondary uplink frequency: 1st Secondary serving HS-DSCH cell: 2nd Secondary serving HS-DSCH cell: 3rd Secondary serving HS-DSCH cell: 4th Secondary serving HS-DSCH cell: 5th Secondary serving HS-DSCH cell: 6th Secondary serving HS-DSCH cell: 7th Secondary serving HS-DSCH cell: Multiflow (FDD only): Assisting serving HS-DSCH Cell: Assisting secondary serving HS-DSCH Cell: Serving E-DCH cell decoupling (FDD only): Radio links without DPCH/F-DPCH (FDD only):

For the purposes of the present document, the following abbreviations apply: ARQ BCCH BCH C- CC CCCH CCH CCTrCH CLTD CN CQI CRC DC DCA DCCH DCH DL DPCCH2 DRNC DSCH DTCH E-AGCH E-DCH E-DPCCH E-DPDCH E-HICH E-PUCH E-RGCH E-ROCH E-RUCCH E-TFC E-UCCH FACH FCS FDD F-DPCH F-TPICH GC GANSS GNSS GPS HARQ HS-DPCCH HS-DSCH HS-SCCH HS-SICH HO ITU kbps L1 L2 L3 LAC LAI MAC MBMS MCCH MICH MM MSCH MTCH Nt PCCH PCH PDU PHY PhyCH RACH RLC RNC RNS RNTI RRC SAP S-DPCCH SDU S-E-DPCCH S-E-DPDCH SRNC SRNS SS TCH TDD TFCI TFI TFRI TMSI TPC TSN U- UE UL UMTS URA UTRA UTRAN

The physical layer interfaces the MAC entity of layer 2. Communication between the Physical Layer and MAC is in an abstract way performed by means of PHY primitives defined which do not constrain implementations. The PHY primitives exchanged between the physical layer and the data link layer provide the following functions:

• transfer of transport blocks over the radio interface;
• indicate the status of the layer 1 to layer 2.

The physical layer interfaces the RRC entity of layer 3 in the UE and in the network. Communication is performed in an abstract way by means of CPHY primitives. They do not constrain implementations. The CPHY primitives exchanged between the physical layer and the Network layer provide the following function:

• control of the configuration of the physical layer.

The currently identified exchange of information across that interface has only a local significance to the UE or Network.

The physical layer offers data transport services to higher layers. The access to these services is through the use of transport channels via the MAC sub-layer. The characteristics of a transport channel are defined by its transport format (or format set), specifying the physical layer processing to be applied to the transport channel in question, such as convolutional channel coding and interleaving, and any service-specific rate matching as needed. The physical layer operates exactly according to the L1 radio frame timing. A transport block is defined as the data accepted by the physical layer to be jointly CRC protected. The transmission block timing is then tied exactly to the TTI timing, e.g. every transmission block is generated precisely every TTI. A UE can set up multiple transport channels simultaneously, each having own transport characteristics (e.g. offering different error correction capability). Each transport channel can be used for information stream transfer of one radio bearer or for layer 2 and higher layer signalling messages. The multiplexing of transport channels onto the same or different physical channels is carried out by L1. Except for HS-DSCH and E-DCH the Transport Format Combination Indication field (TFCI) shall uniquely identify the transport format used by each transport channel of the Coded Composite Transport Channel within the current radio frame. In case of HS-DSCH the identification of the transport format and channelisation codes is realised with the Transport Format and Resource Indication field (TFRI) on an associated shared control channel. In case of FDD E-DCH the identification of the transport format is realised with the E-DCH Transport Format Combination Indication field (E-TFCI) on a associated dedicated control channel. In the case of TDD E-DCH the identification of the transport format is realised with the E-DCH Transport Format Combination Indication field (E-TFCI) multiplexed onto E-PUCH.

The physical layer performs the following main functions:

• FEC encoding/decoding of transport channels;
• measurements and indication to higher layers (e.g. FER, SIR, interference power, transmission power, etc.);
• macrodiversity distribution/combining and soft handover execution;
• error detection on transport channels;
• multiplexing of transport channels and demultiplexing of coded composite transport channels;
• rate matching;
• mapping of coded composite transport channels on physical channels;
• modulation and spreading/demodulation and despreading of physical channels;
• frequency and time (chip, bit, slot, frame) synchronisation;
• closed-loop power control;
• power weighting and combining of physical channels;
• RF processing;
• support of Uplink Synchronisation as defined in [5] (TDD only);
• timing advance on uplink channels (TDD only).

Provided that the RLC PDUs are mapped one-to-one onto the Transport Blocks, Error indication may be provided by L1 to L2. For that purpose, the L1 CRC can be used for individual error indication of each RLC PDU. The L1 CRC may serve multiple purposes:

• error indication for uplink macro diversity selection combining (L1);
• error indication for each erroneous Transport Block in transparent and unacknowledged mode RLC;
• quality indication;
• error indication for each erroneous Transport Block in acknowledged mode RLC.

Regardless of the result of the CRC check, all Transport Blocks are delivered to L2 along with the associated error indications for transport channel other than HS-DSCH and E-DCH. In case of HS-DSCH and E-DCH an error indication is provided to L2 in case of CRC failure. In case of HS-DSCH and E-DCH retransmissions of Transport Blocks may be requested before transport blocks are delivered to L2.