Resource mapping method and system for a physical downlink shared channel pdsch

Abstract

The invention discloses a resource mapping method and system of a downlink physical shared channel PDSCH. The resource mapping method of the downlink physical shared channel PDSCH includes: reading the data frame to be mapped and the subframe parameters and user parameters of the data frame to be mapped; obtaining physical resources corresponding to the subframe parameters and user parameters according to the subframe parameters and user parameters The resource occupation data bitmap of the block PRB; according to the bitmap, the resource address corresponding to the bitmap is searched from the preset database, and the corresponding relationship between the bitmap and the resource address is stored in the preset database; the resource mapping of the data frame to be mapped is obtained according to the resource address address. The present invention generates PRB resource occupancy data bitmap according to subframe parameters and user parameters, and completes the generation of PDSCH resource mapping address through the bitmap. Compared with the prior art, the present invention can reduce the usage of BRAM and save BRAM resources; and The upgrade of the LTE protocol will not increase the depth of the BRAM, and it can be forward compatible with the new version of the LTE protocol.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a resource mapping method and system for a physical downlink shared channel PDSCH. Background technique [0002] The Physical Downlink Shared Channel (PDSCH: Physical Downlink ShaREd CHannel) is used to carry data from the transport channel DSCH. The protocol stipulates that when PDSCH data is sent downlink, it needs to be mapped to RE (REsourceElement). RE refers to a subcarrier on an OFDM symbol. Because LTE resource scheduling is based on RB (REsource Block), so PDSCH Mapping also refers to mapping PDSCH data to RBs composed of REs to form a resource mapping grid. The protocol stipulates that there are two resource mapping methods of PDSCH, VRB (Virtual REsource Block) and PRB (Physical REsource Block). In the existing technical background, FPGA only realizes the mapping of PDSCH to PRB at the physical layer. When determining the resource mapping gate of PDSCH W...

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[0004] Figure 4 It is a schematic diagram of the correspondence between lookup table 1 and lookup table 2, refer to Figure 4 It can be seen that in the prior art, due to the multiple configuration combinations of the PDSCH transmission mode and the antenna port, the RAM resources used in the look-up table are consumed hugely, thereby causing the depth of the BRAM to increase, making FPGA layout and wiring difficult, and timing problems are prone to occur

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