MAC Transport Block MCS Selection for Reliable Control Element Delivery
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Solution Overview
Problem
In wireless communication systems, the reliability of medium access control (MAC) transport blocks carrying control elements (CEs) is compromised due to decoding failures of physical control channels, leading to out-of-sync states and call failures, particularly when using polar codes or low aggregation levels, which affects the transmission of MAC CEs.
Innovation Solution
The solution involves identifying MAC transport blocks carrying MAC CEs and associating them with a first configuration of modulation and coding scheme (MCS) parameters for reliable transmission, while non-CE-carrying MAC transport blocks use either the first or a second, higher spectral efficiency configuration, ensuring soft combining and reducing decoding failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MAC transport blocks carrying MAC CEs use higher spectral efficiency configuration, then data transmission efficiency is improved, but reliability of MAC CE transmission deteriorates
Solution Approach 1:
The patent applies different MCS configurations to different types of MAC transport blocks based on their content. MAC transport blocks carrying MAC CEs use a first MCS configuration optimized for reliability, while MAC transport blocks not carrying MAC CEs use a second MCS configuration optimized for spectral efficiency. This local differentiation resolves the contradiction by tailoring transmission parameters to the specific requirements of each data type.
Solution Approach 2:
The patent segments the MAC transport block transmission into two distinct categories based on whether they carry MAC CEs or not. This segmentation allows the system to apply different modulation and coding schemes to each segment, ensuring that critical control information receives enhanced reliability while general data transmission benefits from higher efficiency.
2Productivity
If polar codes are used for physical control channel transmission, then coding efficiency is improved, but decoding reliability deteriorates
Solution Approach 1:
The patent changes the MCS parameters (modulation order, coding rate) based on the priority and content of the MAC transport block. By adjusting these parameters dynamically, the system can optimize the balance between coding efficiency and decoding reliability for different transmission scenarios, particularly when using polar codes for physical control channel transmission.
3Speed
If low aggregation levels are used for control channel transmission, then transmission speed is improved, but reliability of control element delivery deteriorates
Solution Approach 1:
The patent dynamically adjusts the MCS configuration based on the priority of the MAC transport block and channel conditions. This dynamic adaptation allows the system to maintain high transmission speed through low aggregation levels while ensuring reliability by switching to more robust modulation and coding schemes when needed, particularly for high-priority control elements.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may identify a first medium access control (MAC) transport block (TB) carrying a MAC control element (CE) or a communication having a threshold priority. The wireless communication device may transmit the first MAC TB including a first configuration of modulation and coding scheme (MCS) parameters, wherein MAC TBs associated with MAC CEs or communications having the threshold priority are associated with the first configuration of MCS parameters. The wireless communication device may identify a second MAC TB that does not carry any MAC CE or communication having the threshold priority. The wireless communication device may transmit the second MAC TB including one of the first configuration of MCS parameters or a second configuration of MCS parameters. Numerous other aspects are described.