Resource mapping method and system for physical downlink shared channel (PDSCH)

Abstract

The invention discloses a resource mapping method and system for a physical downlink shared channel (PDSCH). The resource mapping method for the PDSCH comprises the following steps: reading a data frame to be mapped, subframe parameters of the data frame to be mapped, and user parameters; according to the subframe parameters and the user parameters, acquiring bitmaps of resource occupation data of physical resource blocks (PRBs) corresponding to the subframe parameters and the user parameters; searching a preset database for resource addresses corresponding to the bitmaps according to the bitmaps, wherein corresponding relationships between the bitmaps and the resource addresses are stored in the preset database; and acquiring a resource mapping address of the data frame to be mapped according to the resource addresses. The method and system provided by the invention has the advantages that the bitmaps of the resource occupation data of the PRBs are generated according to the subframe parameters and the user parameters, and the resource mapping address of the PDSCH is generated through the bitmaps, so that compared with the prior art, the method and system achieves a smaller BRAM usage amount and lower consumption of BRAM resources; and LTE protocol upgrading does not lead to an increase in the BRAM depth, so that forward compatibility for a new version of the LTE protocol can be achieved.

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 sending PDSCH data in the downlink, it needs to be mapped to RE (REsource Element). RE refers to a subcarrier on one 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...

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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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