Resource Block Rate Matching for Control Data Overhead Reduction
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Solution Overview
Problem
In Frequency Division Multiple Access communication systems, the overhead for non-data-associated control data is excessive in small bandwidths, and odd number of resource blocks assigned for control data complicates CDM multiplexing, particularly for small total bandwidths like 6 resource blocks, leading to inefficient use of resources.
Innovation Solution
The method involves determining if a resource block is used for control data and performing rate matching to transmit non-control data only over a portion of the RB, allowing for efficient use of resources and supporting both even and odd numbers of RBs for control data, thereby reducing overhead and improving multiplexing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 1 RB top and 1 RB bottom are reserved for control data transmissions, then control data can be transmitted with frequency diversity, but the overhead becomes excessive for small total bandwidths
Solution Approach 1:
The resource block structure is segmented into different regions: control regions at the beginning and end of the bandwidth, and data regions in between. This segmentation allows control data to be transmitted in dedicated regions while minimizing the overhead impact on total bandwidth by precisely defining the control region boundaries.
Solution Approach 2:
Different parts of the frequency spectrum are assigned different functions: the top and bottom resource blocks are designated for control data transmissions to ensure frequency diversity, while the middle portion is allocated for user data. This local quality differentiation optimizes both control reliability and data throughput.
2Adaptability or versatility
If odd number of RBs are assigned for control data, then resource allocation flexibility is improved, but CDM multiplexing becomes more difficult due to non-integer RBs
Solution Approach 1:
When an odd number of resource blocks are assigned, the system allows partial usage of the last resource block for control data purposes. This partial action approach enables flexible resource allocation while maintaining integer RB boundaries for CDM multiplexing operations, resolving the conflict between flexibility and multiplexing simplicity.
Data Source
AI summary
When a UE (102) determines that non-control data needs to be transmitted, the UE will receive a grant that comprises information identifying a resource block (RB) for transmissions by the UE. If the UE determines that the RB is also used for transmitting control data, it will know to transmit only over the portion of the RB used for non-control data transmissions. Rate matching will then be performed on the non-control data that needs to be transmitted and the non-control data will be transmitted only over a portion of the RB. The second portion of the RB will be used for normal control data transmissions by other UEs.