TBS MCS Table Indexing for Wireless Signaling Overhead
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in determining Transport Block Size (TBS) and Modulation and Coding Scheme (MCS) allocation for mobile stations, leading to increased signaling overhead and reduced bandwidth utilization.
Innovation Solution
The implementation of a method where a mobile station uses a statically defined TBS/MCS table, accessed via a 5-bit MCS index field, to infer TBS from PRB allocation and MCS information, reducing the need for explicit signaling and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit signaling of TBS and MCS parameters is used, then mobile stations can accurately determine resource allocation, but signaling overhead increases and bandwidth utilization decreases
Solution Approach 1:
The patent uses a pre-defined TBS/MCS table that both the base station and mobile station have stored. Instead of transmitting the actual TBS and MCS values, the system transmits an index that points to the corresponding entry in the pre-shared table. This copying approach allows the mobile station to accurately determine TBS and MCS by looking up the index in its local table, eliminating the need for explicit parameter signaling while maintaining determination accuracy.
Solution Approach 2:
The patent introduces an index as an intermediary between the TBS/MCS parameters and the mobile station. Rather than directly signaling the complex TBS and MCS parameters, the system signals a simple index value that serves as a mediator. This index points to the specific TBS and MCS configuration in the pre-defined table, reducing signaling overhead while enabling accurate parameter determination through table lookup.
2Manufacturing precision
If more parameters are explicitly signaled for TBS and MCS allocation, then resource allocation precision improves, but bandwidth utilization decreases due to increased overhead
Solution Approach 1:
The patent merges multiple parameters (TBS, MCS, and their interrelationships) into a single unified TBS/MCS table. By combining these parameters into a pre-coordinated table structure where TBS and MCS values are systematically paired, the system can signal only an index to convey all necessary allocation information. This merging maintains resource allocation precision while eliminating the bandwidth overhead of signaling each parameter separately.
Solution Approach 2:
The patent changes the signaling parameter from multiple detailed parameters (TBS, MCS) to a single compact index parameter. This parameter transformation allows the system to convey the same resource allocation information using significantly fewer bits. The index parameter serves as a compressed representation that references the pre-defined parameter combinations in the table, improving bandwidth utilization while preserving allocation precision.
Data Source
AI summary
A method and apparatus for generating a single statically defined downlink reference MCS table consisting of transport block sizes (TBSs) computed for 29 MCSs for each of j PRBs where j=1, . . . , NRBDL. Three entries of the MCS table are reserved for implicit modulation order signaling (e.g. in the downlink) or implicit redundancy version signaling (e.g. in the uplink). Each MCS entry in the table is populated by a TBS and the table entries are accessed based on a 5-bit MCS index and resource allocation information, indicating the number of PRBs is signaled via a scheduling message which may be a grant or assignment message. A grant or assignment message may further include a 5-bit MCS field for each transport block which, along with the resource allocation information, enables the UE to determine the scheduled TBS.