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Downlink self-adapting method

A downlink and self-adaptive technology, applied in radio/inductive link selection arrangements, transmission control/equalization, selection devices, etc., can solve problems such as unseen downlink self-adaptive implementation methods

Inactive Publication Date: 2008-10-29
GLOBAL INNOVATION AGGREGATORS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, according to the provisions of the protocol, there is no specific implementation method for downlink adaptation under UE selective sub-band feedback

Method used

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Examples

Experimental program
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Embodiment 1

[0054] Embodiment 1, assuming that a UE is in the transmit diversity mode of the eNodeB and uses UE selective subband feedback. After the UE is scheduled, the number of RBGs corresponding to the subband CQI is Z, and the number of RBGs corresponding to the wideband CQI is K. The eNodeB performs single-stream transmission, and its transport block size has nothing to do with the number of layers υ, and it is assumed that the remaining data in the buffer of the scheduled UE is BufData. What needs to be explained here is that how to implement the scheduling of the UE belongs to the prior art, and will not be introduced here. figure 2 It is a flow chart of the downlink adaptive method of the present invention in which the UE is in transmit diversity mode, such as figure 2 shown, including the following steps:

[0055] Step 200: Search the MCS / TBS table according to the transmission mode of the UE and the subband CQI information, and obtain the transport block size TBz that the U...

Embodiment 2

[0070]Embodiment 2, assuming that a certain UE is in the closed-loop spatial multiplexing transmission mode of the eNodeB, using UE selective subband feedback, after the UE is scheduled, the number of RBGs corresponding to the subband CQI is Z, and the number of RBGs corresponding to the wideband CQI is Z is K, the current feedback Rank>1, the eNodeB performs dual-stream transmission, the number of layers used for transmission υ=Rank, and it is assumed that the remaining data in the buffer of the scheduled UE is BufData. What needs to be explained here is that how to implement the scheduling of the UE belongs to the prior art, and will not be introduced here. image 3 It is a flowchart of the downlink adaptive method of the present invention when the UE is in the closed-loop spatial multiplexing transmission mode, such as image 3 shown, including the following steps:

[0071] Step 300: Search the MCS / TBS table according to the transmission mode of the UE and the subband CQI ...

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Abstract

The invention provides a downlink self-adaptive method; wherein, a resource block group (RBG) corresponding to a sub-band channel quality indicator (CQI) of good quality is used for sending data scheduled to UE. When the RBG corresponding to the sub-band CQI does not meet the requirement of data amount, the RBGs corresponding to the sub-band CQI and a part of broad band CQI are jointly used for sending the data scheduled to the UE; however, when both the RBG corresponding to the sub-bond CQI and the RBG corresponding to the broad band CQI do not meet the requirement of the data amount, the sub-band CQI and all RBGs corresponding to the broad band CQI are used for sending a part of the data scheduled to the UE. Furthermore, when the TBz can be sent by the RBG corresponding to the sub-bond CQI is less than the TBz can be sent by the RBG corresponding to the broad band CQI, the RBG corresponding to the sub-bond CQI is used for sending the data scheduled to the UE. Under the feedback of UE selective sub-band CQI, the method of the invention not only adopts a single code modulation mode for each data stream, but also obtains comparatively high downlink throughput rate.

Description

technical field [0001] The invention relates to long-term evolution (LTE) mobile communication technology, in particular to a downlink adaptive method under user terminal (UE) selective sub-band feedback. Background technique [0002] In the 3rd Generation Partnership Project (3GPP) LTE, an evolved base station (eNodeB) supports four transmission modes: single-antenna transmission, transmit diversity, open-loop spatial multiplexing, and closed-loop spatial multiplexing. According to Section 7.2 of 3GPP TS 36.213V8.2.0, the UE reports the process of channel quality indication (CQI), precoding matrix indication (PMI) and rank indication (RI). Channel (PUSCH) and physical uplink control channel (PUCCH) support UE selective subband feedback. [0003] Under the UE selective subband feedback, the UE will feed back two types of CQI, ie subband CQI and wideband CQI. For PUSCH, the UE will feed back a subband CQI indicating the average channel quality on the M best subbands and a w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04Q7/22
Inventor 陈冬雷彭佛才
Owner GLOBAL INNOVATION AGGREGATORS LLC
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