Sidelink MAC SDU Multiplexing for Lower SCI Overhead
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Solution Overview
Problem
In sidelink communication, scheduling small packet services results in low resource utilization and high sidelink control information overheads due to inefficient resource allocation and increased complexity in blind detection of physical sidelink control channels.
Innovation Solution
A method involving multiplexing MAC SDUs from multiple terminal devices into a single transport block and using indication information to optimize resource utilization and reduce unnecessary receptions, thereby improving resource efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small packet services are scheduled independently in a unit of subchannel, then each service can be transmitted, but resource utilization becomes low and SCI overhead increases
Solution Approach 1:
The patent combines multiple small packet services into a single transport block for transmission. Multiple MAC SDUs from different services are multiplexed and concatenated to form one TB, which is then transmitted together on the PSSCH. This merging approach allows the system to transmit multiple services simultaneously without requiring separate scheduling for each service, thereby improving resource utilization and reducing SCI overhead.
Solution Approach 2:
The patent segments the transport block into multiple MAC SDUs, each corresponding to different services. The TB is divided into multiple service data units that can be independently identified and processed by the receiving end. This segmentation allows the system to maintain service differentiation while transmitting multiple services in a single TB, resolving the contradiction between resource utilization and service identification.
2Adaptability or versatility
If the quantity of PRBs in each subchannel is reduced to improve scheduling flexibility, then resource allocation becomes more flexible, but the quantity of subchannels increases leading to higher blind detection complexity
Solution Approach 1:
The patent introduces a new dimension for resource allocation by using transport blocks that can carry multiple MAC SDUs from different services. Instead of allocating resources at the subchannel level for each service, the system allocates resources at the TB level, where multiple services can be multiplexed. This dimensional change allows the system to maintain scheduling flexibility while reducing the number of individual resource allocation operations, thereby reducing blind detection complexity.
Data Source
AI summary
This application provides a sidelink communication method and a communication apparatus. According to this application, a first terminal device may multiplex MAC SDUs sent to a plurality of second terminal devices into one first TB, and transmit the first TB on one PSSCH resource. In addition, the first terminal device may further send first indication information to the plurality of second terminal devices, to indicate whether the first TB sent by the first terminal device includes a MAC SDU corresponding to each second terminal device.