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Content for  TS 25.308  Word version:  16.0.0

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1  ScopeWord‑p. 7

The present document is a technical specification of the overall support of High Speed Downlink Packet Access in UTRA.

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. 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.
TR 25.855: "High Speed Downlink Packet Access (HSDPA): Overall UTRAN Description".
→ to date, withdrawn by 3GPP
TS 25.321: "Medium Access Control (MAC) protocol specification".
TS 25.319: "FDD Enhanced Uplink: Overall description".
TS 25.214: "Physical Layer Procedures (FDD)".
TS 25.331: "Radio Resource Control (RRC)".
TS 25.211: "Physical channels and mapping of transport channels onto physical channels (FDD)".
TS 25.301: "Radio interface protocol architecture".
TS 25.304: "User Equipment (UE) procedures in idle mode and procedures for cell reselection in connected mode".
TS 25.221: "Transport channels and physical channels (TDD)".
TS 25.224: "Physical Layer Procedures (TDD)".
TS 25.222: "Multplexing and Channel Coding (TDD)".

3  Definitions and abbreviations

3.1  Definitions

For the purposes of the present document, the following terms and definitions apply.
Blind HARQ retransmissions for HSDPA (FDD):
A HARQ operation where a UE in CELL_DCH state supports reception of MAC-hs/ehs PDU within 5 sub-frames from the reception of the previous MAC-hs/ehs PDU intended for the same HARQ process.
Data block:
The data transmitted to one UE on HS-DSCH in one transport block (one or two transport blocks are transmitted per TTI in single and dual stream transmission respectively per HS-DSCH, three transport blocks are transmitted per TTI in three streams transmission per HS-DSCH and four transport blocks are transmitted per TTI in four streams transmission per HS-DSCH).
Priority class:
One flow of data within a HS-DSCH transport channel. One HS-DSCH can transport several priority classes (no more priority classes per TTI than the number of transport blocks). There is only one priority class per TTI (MAC-hs only) or several priority classes per TTI (MAC-ehs only).
HARQ Process:
Peer state machines capable of achieving error correction by retransmission. One process can be used only for one data block at a time.
HARQ Entity:
Consists of all the HARQ processes of a UE for one HS-DSCH transport channel, controlling part or all the available soft buffer capacity.
Serving HS-DSCH radio link:
The radio link that the HS-PDSCH physical channel(s) allocated to the UE belongs to.
Serving HS-DSCH cell:
The cell associated with the UTRAN access point performing transmission and reception of the serving HS-DSCH radio link for a given UE. The serving HS-DSCH cell is always part of the current active set of the UE.
Serving HS-DSCH Node B:
A role a Node B may take with respect to a UE having one or several HS-PDSCHs allocated. The serving HS-DSCH Node B is the Node B controlling the serving HS-DSCH cell.
HS-SCCH set:
a set of HS-SCCH which is used for HS-PDSCH allocation. There is a maximum of four HS-SCCHs in a given HS-SCCH set. There can be multiple HS-SCCH sets in one cell. HS-SCCH sets are independent, i.e. they can overlap or have no intersection.
Serving HS-SCCH set:
the HS-SCCH set being used by a given UE for HS-PDSCH allocations.
MAC-d flow:
a MAC-d flow is a flow of MAC-d PDUs which belong to logical channels which are MAC-d multiplexed.
Common MAC Flow:
a Common MAC Flow is a flow of MAC-c PDU mapped to HS-DSCH configured for UEs in Cell_FACH.
Paging MAC Flow:
a Paging MAC Flow is a flow of MAC-c PDU mapped to HS-DSCH configured for UEs in Cell_PCH and URA_PCH.
A mode of operation with two simultaneous HS-DSCH transport channels per carrier frequency, where the HS-DSCH transport channels may belong to the same or different Node Bs.
Assisting serving HS-DSCH Cell:
In addition to the serving HS-DSCH cell, a cell in the same frequency, where the UE is configured to simultaneously monitor a HS-SCCH set and receive HS-DSCH if it is scheduled in that cell.
Assisting secondary serving HS-DSCH Cell:
In addition to the serving HS-DSCH cell, a cell in the secondary downlink frequency, where the UE is configured to simultaneously monitor a HS-SCCH set and receive HS-DSCH if it is scheduled in that cell.
Designated non-serving HS-DSCH cell:
The non-serving HS-DSCH cell from which the UE estimates the F-DPCH quality for TPC derivation, when the UE is configured with DPCCH2 in the uplink or the Serving E-DCH cell decoupling is configured. The TPC is transmitted on UL DPCCH.
Serving E-DCH cell decoupling (FDD only):
An E-DCH operation mode in which the Serving HS-DSCH cell and the Serving E-DCH cell are different.

3.2  AbbreviationsWord‑p. 8

For the purposes of the present document, the following abbreviations apply:
16 Quadrature Amplitude Modulation
Coded Composite Transport Channel
Channel Quality Indicator
Dedicated Physical Control Channel 2
Hybrid Automatic Repeat Request
High Speed Downlink Packet Access
High Speed Downlink Shared Channel
High Speed Physical Downlink Shared Channel
Shared Control Channel for HS-DSCH
Shared Information Channel for HS-DSCH
Modulation and Coding scheme
single user Multple Input Multiple Output
Multi-User Multiple Input Multiple Output
Quadrature Phase Shift Keying
Transport Format Combination Indicator
Transport Format Resource Combination
Transport Format and Resource Indicator
Transmit Power Control
Transmission Sequence Number
User Equipment

4  Background and IntroductionWord‑p. 9

High Speed Downlink Packet Access is based on techniques such as adaptive modulation and hybrid ARQ to achieve high throughput, reduce delay and achieve high peak rates.
It relies on a new type of transport channel, the HS-DSCH, which is terminated in the Node B.
In FDD and 1.28Mcps TDD, the HS-DSCH reception is also supported in CELL_FACH, CELL_PCH and URA_PCH state.

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