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Data precoding processing method based on 4Tx codebook and device
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A technology of precoding and precoding matrix, applied in the field of communication, which can solve problems such as low performance and no solution proposed
Active Publication Date: 2014-07-02
SANECHIPS TECH CO LTD
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During the discussion of 3GPP's R10 and R11, the 4-antenna codebook defined in R8 was evaluated, and the simulation results showed its performance in multi-user transmission and cross-polarized linear antenna array (Cross Polarized Linear Antenna Array, referred to as CLA) antenna transmission environment lower
[0006] For the above-mentioned problems that arise after the introduction of 4-antenna enhanced CSI, no effective solution has been proposed yet
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Embodiment 1
[0044] figure 1 It is a flowchart of a method for configuring a 4-antenna codebook according to Embodiment 1 of the present invention. This method is applied to base stations such as figure 1 As shown, the method includes:
[0045] Step S102, determining the configuration rules of the 4Tx codebook based on the CRS transmission mode;
[0046] Step S104, obtain the 4Tx codebook used for downlink data precoding according to the above configuration rules;
[0047] Step S106, perform precoding processing on the downlink data to be sent according to the obtained 4Tx codebook.
[0048] Through the above processing steps, since the enhanced 4Tx codebook is used for UE feedback, the base station can obtain more accurate downlink channel information, thereby bringing corresponding scheduling gain. Furthermore, the base station selects a 4Tx codebook for downlink data precoding based on configuration rules, so that precoding gain may be obtained.
[0049] In this embodiment, step S1...
Embodiment 2
[0087] This embodiment corresponds to Embodiment 1, and is described on the UE side. Figure 4 It is a flowchart of a method for configuring and processing a 4-antenna codebook according to Embodiment 2 of the present invention. This method is applied to UE, such as Figure 4 As shown, the method includes:
[0088] Step S402, the UE working in the CRS-based transmission mode receives the downlink data sent by the base station based on the 4Tx codebook precoding process, wherein the 4Tx codebook used for the precoding process is obtained according to the configuration rule obtained by the PMI;
[0089] Step S404, demodulate the downlink data according to the precoding matrix indicated in the above downlink data.
[0090] In this embodiment, the above-mentioned configuration rules include one of the following: reuse the transmission precoding matrix indicator (TPMI) bit number of the control signaling in the existing specified transmission mode, increase the number of bits in ...
Embodiment 3
[0100] The UE feeds back the enhanced 4Tx codebook, and the codebook indicated by the TPMI is the codebook of R10. Considering that the 4Tx codebook of R10 has been fully evaluated and tested, this embodiment is a relatively conservative method with minimal changes to the standard.
[0101] Considering that the actual precoding codebook is not enhanced, the main gain of the enhanced codebook in CRS mode comes from user scheduling (user pairing, MCS selection, etc.).
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Abstract
The invention provides a data precodingprocessing method based on 4Tx codebook and a device. The method is applied to a base station. The method comprise steps of determining a 4Tx codebook configuration rule on the basis of a CRS (Cell-specific Reference Signal) transmission mode, acquiring a 4Tx codebook used for downlink data precoding according to the configuration rule, and carrying out precodingprocessing on to-be-transmitted downlink data according to the acquired 4Tx codebook. When the above technical scheme of the invention is adopted, the technical problems that a solution scheme for being effectively compatible with the CRS transmission mode does not exist and the like when 4Tx is introduced for enhancing the CSI (Cross Polorized Linear Antenna Array) can be solved, and compatibility with the CRS transmission mode is realized while the 4Tx codebook is enhanced.
Description
technical field [0001] The present invention relates to the communication field, in particular, to a data precoding processing method and device based on a 4-antenna (4Tx) codebook. Background technique [0002] The 3rd Generation Partnership Project (3rd Generation Partnership Project, referred to as 3GPP) version 8 (Release, referred to as R8) long-term evolution (Long-Term Evolution, referred to as LTE) uses the Household method to construct a codebook space for 4 antennas, That is, in the LTE-A (3GPP R10) standard, an 8-antenna codebook space (ie, a codebook used in actual transmission) for multi-user transmission is defined. During the discussion of 3GPP's R10 and R11, the 4-antenna codebook defined in R8 was evaluated, and the simulation results showed its performance in multi-user transmission and cross-polarized linear antenna array (Cross Polarized Linear Antenna Array, referred to as CLA) antenna transmission environment lower. Therefore, the enhanced 4Tx codeboo...
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