R-PDSCH Resource Allocation via Shunning Field
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Solution Overview
Problem
Current LTE-A systems lack an effective method for mapping and resource allocation for the Relay link-Physical Downlink Shared Channel (R-PDSCH), particularly in scenarios where resources allocated for the R-PDCCH overlap with those for R-PDSCH, leading to issues with data mapping and transmission.
Innovation Solution
A method and apparatus for mapping and resource allocation of R-PDSCH that allows data to be sent on non-overlapping or partially overlapping resources, using strategies such as shunning and puncturing, and adopting a grouping-tree resource allocation mode to ensure flexible resource allocation and backward compatibility with LTE systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If R-PDCCH and R-PDSCH are transmitted in the same PRBs using FDM+TDM mode, then resource utilization is improved, but resource overlap and interference occur
Solution Approach 1:
The patent segments the resource allocation by introducing a shunning field that divides PRBs into two categories: shunned PRBs (where R-PDSCH is not mapped) and non-shunned PRBs (where R-PDSCH can be mapped). This segmentation resolves the contradiction by allowing FDM+TDM operation while preventing overlaps through structured resource division.
Solution Approach 2:
The patent applies preliminary action by determining the shunned PRB set before R-PDSCH resource mapping. The eNodeB预先 identifies which PRBs will be used by R-PDCCH and marks them as shunned, ensuring that R-PDSCH resource allocation avoids these regions from the outset, thus preventing interference while maintaining high resource utilization.
2Productivity
If R-PDSCH data is mapped on all allocated resources, then data transmission efficiency is improved, but overlap with R-PDCCH resources causes interference
Solution Approach 1:
The patent extracts the problematic overlapping resources by identifying and isolating them into a shunned PRB set. The shunning field explicitly indicates which PRBs should be excluded from R-PDSCH mapping, effectively removing the source of interference while allowing R-PDSCH to utilize all non-shunned resources for efficient data transmission.
Solution Approach 2:
The shunning field acts as an intermediary mechanism that mediates between R-PDCCH and R-PDSCH resource allocation. It carries the shunned PRB information from the eNodeB to the relay node, enabling the relay node to adjust its resource mapping strategy and avoid interference without requiring complex coordination or retransmission protocols.
3Reliability
If shunning strategy is used to avoid R-PDCCH resources, then interference is reduced, but signaling overhead increases
Solution Approach 1:
The patent changes the parameter representation of resource allocation by introducing a compact shunning field that indicates shunned PRB sets. Instead of using complex avoidance algorithms or extensive signaling, the shunning field efficiently encodes the resource allocation information, reducing signaling overhead while maintaining reliable resource allocation through the shunning mechanism.
Data Source
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AI summary
The present disclosure provides a mapping and resource allocation method for R-PDSCH, including: when resources allocated for an R-PDCCH overlap with resources allocated for the R-PDSCH, data of the R-PDSCH is not mapped or sent on over-lapped resources, or the data of the R-PDSCH to be sent on the over-lapped resources is punctured; the data of the R-PDSCH is mapped and sent on all or partial resources which are not occupied by the R-PDCCH; a receiving end receives data according to the mapping method for the R-PDSCH; wherein a resource allocation mode corresponding to a shared channel in an LTE system is reused or a grouping-tree resource allocation mode is used to allocate resources for the R-PDSCH. The present disclosure is well applicable to a link between an eNode-B and a relay node, and the resource allocation mode is flexible, the signalling overhead is lowered, therefore, not only the backward compatibility is ensured, but also the problem of mapping and resource allocation of the R-PDSCH is solved.