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Method for feeding back channel adaptive parameters to base station and UE (User Equipment)

A technology for adapting parameters and base station feedback, applied in the field of mobile communications, can solve problems such as lowering system performance, eNB cannot accurately adapt channels, etc., and achieve the effect of improving system performance

Active Publication Date: 2011-10-19
北京万海云科技有限公司
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Problems solved by technology

[0004] However, in the existing solutions, the RI, PMI and CQI fed back by the UE to the eNB are not the optimal combination among all possible combinations, which makes the eNB unable to accurately adapt the channel and reduces the performance of the system

Method used

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  • Method for feeding back channel adaptive parameters to base station and UE (User Equipment)
  • Method for feeding back channel adaptive parameters to base station and UE (User Equipment)
  • Method for feeding back channel adaptive parameters to base station and UE (User Equipment)

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Embodiment Construction

[0023] In the present invention, the sum of the throughputs of all codewords is used as the criterion, and the best combination of RI, PMI and CQI is searched exhaustively and returned to the eNB. In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] figure 2 It is a flowchart of a method for feeding back channel adaptation parameters to a base station in an embodiment of the present invention. In the present invention, the channel adaptation parameters include: rank index RI, precoding matrix index PMI and channel quality indicator CQI, such as figure 2 As shown, the method includes:

[0025] 201. Traverse all value combinations of RI, PMI, and CQI, and calculate the throughput of each codeword in the case of each value combination of RI, PMI, and CQI;

[0026] 202. For each value combination o...

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Abstract

The invention discloses a method for feeding back channel adaptive parameters to a base station and UE (User Equipment). The method comprises the following steps of: traversing all value combinations of RI (Rank Index), PMI (Pre-coding Matrix Index) and CQI (Channel Quality Indicator) and calculating the throughput of each code word under the condition of each value combination of the RI, the PMI and the CQI; traversing all values of the CQI for each value combination of the RI and the PMI, finding out the maximum throughout of each code word from the values and recording corresponding CQI values, calculating and recording the summation of the maximum throughout of each code word; finding out the maximum value of the summation of the recorded maximum throughout, taking an RI value and a PMI value corresponding to the maximum value as RI and PMI parameters to be fed back and taking a CQI value corresponding to each maximum throughout forming the maximum value as a CQI parameter to be fed back. According to the technical scheme of the invention, an eNB can be accurately adapted with the channel and further the performance of the system is improved.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a method for feeding back channel adaptation parameters to a base station and a UE. Background technique [0002] The Long Time Evolution (LTE, Long Time Evolution) system adopts key technologies such as Orthogonal Frequency Division Multiplexing, multiple antennas, and link adaptation. figure 1 It is a schematic diagram of downlink physical channel processing in the LTE system. Such as figure 1 As shown, in the transmission mode 4 of the LTE system, the situation of the downlink channel is: according to the difference of the rank index (RI), the number of codewords sent downlink will also be different. When RI=1, only one codeword is sent; when RI>1, two codewords are sent. And each codeword is independently scrambled and modulated, and then through layer mapping processing, each codeword is mapped to a layer. The number of layers is greater than or equa...

Claims

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Application Information

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IPC IPC(8): H04W72/08H04B7/06H04B7/08
Inventor 张连波吴松
Owner 北京万海云科技有限公司
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