hsdpa技術簡介和分析-資料下載頁
2025-05-10 16:08本頁面
【正文】 er and terminal receiver, providing several advantages over transmit diversity techniques with multiple antennas only at the transmitter and over conventional single antenna systems. MIMO Benefit ? If multiple antennas are available at both the transmitter and receiver, the peak throughput can be increased using a technique known as code reuse. ? With code reuse, each channelization/scrambling code pair allocated for HSDSCH transmission can modulate up to M distinct data streams, where M is the number of transmit antennas. Stand alone DSCH ? Definition – A standalone DSCH is a DSCH on a downlink carrier that is different from the WCDMA carrier that carries its panion DPCH ? Benefit – By assigning up to whole carrier for the HSDSCH, the maximum power and code space available for HSDSCH transmission would be increased as no resource has to be set aside for DCH or mon channels. Stand alone DSCH ? Perform scheme – Base WCDMA – Base OFDM Stand alone DSCH Impact ? The introduction of the Standalone DSCH would lead to some modifications of the physical layer structure as far as physical channel characteristics are concerned. ? Impact is mostly on the UE, as a double receiver would be needed due to the simultaneous reception on two carriers. Impact On R99 amp。 R4 ? Radio Interface Architecture ? Uplink Signalling ? Downlink Signalling ? UE Capability ? MAC ? Iub amp。 Iur Impact on Architecture ? In R99 scheduling is perfermed at the SRNC. ? In order to support fast scheduling and reduce UE memory requirements,it is proposed to include a new entity called MAC HSDSCH terminated in Node B. ? the transport format selection and scheduling are located in MAC HSDSCH entity. Radio Interface Architecture L2L1HSDSC HFPR L CL2L1L2L1L2L1HSDSC HFPIub IurP HYMACP HYR L CUuMACHSDSC HHSDSC HFPHSDSC HFPMA C c/ shMA C DUE Capability ? Number of codes ? Number of channels N ? Modulation level support ? Memory in UE ? Should be included in TS MAC ? MAChs at UE side – The HARQ entity is responsible for handling the HARQ protocol. generating ACKs and/or NACKs. ? MAChs at UTRAN side – Flow Control – HARQ – Scheduling/Priority Handling – TFC selection Iub amp。 Iur ? Discuss in RAN3 Conclusions ? HSDPA allows the increase of throughput and peak data rates with reduction in conitant delay. ? HSDSCH will be specified for both the UTRA/FDD and UTRA/TDD modes.
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