Sidelink Search Space Configuration for Latency Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sidelink communication systems require receivers to perform blind decoding of all sub-channels, which exceeds the capabilities of user equipment (UE) in applications like IoT, leading to increased latency and reduced reliability due to excessive processing power and bandwidth usage.
Innovation Solution
Configuring a search space as a subset of available sub-channels to decode sidelink packets, allowing receivers to only perform blind decoding within this subset, reducing the need for extensive processing and bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding of all sub-channels is performed, then complete sidelink packet reception is achieved, but processing power and bandwidth requirements exceed UE capabilities
Solution Approach 1:
The patent divides the entire set of sub-channels into multiple search spaces (first search space and second search space), each handling specific types of sidelink packets. This segmentation allows the receiver to focus decoding efforts on relevant sub-channels based on packet type, reducing overall processing requirements while maintaining complete packet reception capability.
Solution Approach 2:
The patent implements partial action by configuring different search spaces with different decoding requirements. The first search space uses a first blind decoding maximum for initial sidelink packets, while the second search space uses a second blind decoding maximum for subsequent packets. This partial application of full decoding to only necessary packet types reduces processing power consumption while ensuring reliable reception.
2Reliability
If blind decoding of all sub-channels is performed, then complete sidelink packet reception is achieved, but latency increases due to excessive processing
Solution Approach 1:
By segmenting sub-channels into distinct search spaces with different decoding configurations, the system enables parallel processing paths. The receiver can simultaneously handle first sidelink packets in the first search space and second sidelink packets in the second search space, reducing overall decoding latency while maintaining reliable reception of all packet types.
Solution Approach 2:
The patent applies partial decoding action by using different blind decoding maximums for different search spaces. The first search space uses a lower blind decoding maximum for initial packets, reducing processing time, while the second search space uses a higher maximum for subsequent packets. This differentiated approach reduces overall latency compared to uniform full decoding of all sub-channels.
3Device complexity
If search space is configured as subset of sub-channels, then processing power is reduced, but resource utilization must be maximized
Solution Approach 1:
The patent segments the search space into multiple subsets (first search space and second search space), each optimized for specific packet types. This segmentation reduces processing power requirements by avoiding redundant decoding of all sub-channels, while maintaining high resource utilization by ensuring that each segment efficiently handles its designated packet type without waste.
Solution Approach 2:
The patent changes the parameter of blind decoding maximum differently for different search spaces. The first search space uses a first blind decoding maximum while the second search space uses a second blind decoding maximum. This parameter differentiation optimizes processing power consumption for each packet type while maximizing overall resource utilization by matching decoding effort to actual packet requirements.
Data Source
AI summary
Aspects of the present disclosure provide techniques for configuring a search space for sidelink communications between a plurality of user equipments (UEs). Particularly, the techniques described herein configure a search space (e.g., subset of all available sub-channels) to decode the sidelink packets (e.g., physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH)) transmitted between a first UE and a second UE over sidelink communication without the need for the receiver UE (e.g., second UE) to perform blind decoding of all sidelink sub-channels as is currently required in conventional systems. Thus, the disclosed techniques reduce latency and maximize the resource utilization (e.g., by using less processing power and bandwidth) for sidelink communications.