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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.
[1]
TR 25.855: "High Speed Downlink Packet Access (HSDPA): Overall UTRAN Description".
→ to date, withdrawn by 3GPP
[2]
TS 25.321: "Medium Access Control (MAC) protocol specification".
[3]
TS 25.319: "FDD Enhanced Uplink: Overall description".
[4]
TS 25.214: "Physical Layer Procedures (FDD)".
[5]
TS 25.331: "Radio Resource Control (RRC)".
[6]
TS 25.211: "Physical channels and mapping of transport channels onto physical channels (FDD)".
[7]
TS 25.301: "Radio interface protocol architecture".
[8]
TS 25.304: "User Equipment (UE) procedures in idle mode and procedures for cell reselection in connected mode".
[9]
TS 25.221: "Transport channels and physical channels (TDD)".
[10]
TS 25.224: "Physical Layer Procedures (TDD)".
[11]
TS 25.222: "Multplexing and Channel Coding (TDD)".
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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.
Multiflow:
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.
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3.2  AbbreviationsWord‑p. 8

For the purposes of the present document, the following abbreviations apply:
16QAM
16 Quadrature Amplitude Modulation
CCTrCH
Coded Composite Transport Channel
CQI
Channel Quality Indicator
DPCCH2
Dedicated Physical Control Channel 2
HARQ
Hybrid Automatic Repeat Request
HSDPA
High Speed Downlink Packet Access
HS-DSCH
High Speed Downlink Shared Channel
HS-PDSCH
High Speed Physical Downlink Shared Channel
HS-SCCH
Shared Control Channel for HS-DSCH
HS-SICH
Shared Information Channel for HS-DSCH
MCS
Modulation and Coding scheme
MIMO
single user Multple Input Multiple Output
MU-MIMO
Multi-User Multiple Input Multiple Output
NW
Network
QPSK
Quadrature Phase Shift Keying
TFCI
Transport Format Combination Indicator
TFRC
Transport Format Resource Combination
TFRI
Transport Format and Resource Indicator
TPC
Transmit Power Control
TSN
Transmission Sequence Number
UE
User Equipment
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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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