Sidelink Groupcast Beam Training via Base Station Coordination
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently and reliably establishing sidelink groupcast communications, particularly in determining optimal beams for directional transmission and reception between multiple user equipment (UEs), which affects throughput and reliability in applications like V2X and IoT device communications.
Innovation Solution
A method and apparatus for sidelink groupcast beam training, where a UE transmits a beam training request to a base station, receives a beam training grant, performs a beam training procedure, and sends a beam training report to determine preferred beams for groupcast sidelink communications, enabling efficient beam identification and resource allocation for reliable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam training procedures are implemented for sidelink groupcast communications, then beam determination accuracy and communication reliability are improved, but system complexity and overhead increase
Solution Approach 1:
The base station acts as an intermediary that coordinates beam training between UEs. The base station receives beam training requests from transmitting UEs, determines appropriate beam training resources and configurations, and provides beam training grants to participating UEs. This intermediary approach enables reliable beam determination while centralizing complexity management at the network side rather than requiring complex distributed coordination among UEs.
Solution Approach 2:
Beam training is performed as a preliminary action before actual sidelink groupcast communications begin. The system establishes beam relationships through training procedures that determine optimal beams in advance, allowing subsequent communications to use these pre-determined beams without repeated training overhead. This preliminary beam establishment improves communication reliability while limiting complexity to the initial setup phase.
2Measurement precision
If beam training requests and reports are exchanged between UEs and base station, then beam identification accuracy is improved, but communication overhead and signaling load increase
Solution Approach 1:
The system implements partial beam training by determining the number of beam training requests and reports based on actual communication needs. The base station configures beam training parameters including the number of beams to train, the number of requests to exchange, and reporting requirements tailored to each sidelink groupcast scenario. This partial action approach achieves sufficient beam identification accuracy without requiring exhaustive beam training that would generate excessive overhead.
Solution Approach 2:
The base station dynamically adjusts beam training parameters such as the number of beam training requests, number of beam training reports, beam widths, and resource allocations based on channel conditions, UE capabilities, and communication requirements. These parameter changes enable the system to optimize the balance between beam identification accuracy and signaling overhead for different operational scenarios.
Data Source
AI summary
Methods, systems, and devices for sidelink groupcast communications are described. A user equipment (UE) may transmit a beam training request to a base station to determine beams for use with other UEs in a sidelink groupcast communications group. The base station may receive the beam training request, identify wireless resources that a group of UEs may use to perform beam training, and may transmit a beam training grant to each UE of the group of UEs. The UE may transmit a number of training beams using the wireless resources provided in the beam training grant, and the other UEs may measure received signals on the wireless resources to identify one or more beams. Each UE may provide a beam training report to the base station. The base station, based on the beam training reports, may determine beams and resources for use in the groupcast sidelink communications.