Sidelink Beam Selection Using Shared Channel Measurements
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Solution Overview
Problem
The reliability of communication in sidelink (SL) between terminal apparatuses is a pressing issue that needs to be addressed.
Innovation Solution
A method involving the exchange of multiple reference signals and channel measurement results between terminal apparatuses to determine both transmit and receive beams, using preset thresholds to ensure optimal beam selection, thereby improving communication reliability and reducing resource overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal apparatus determines transmit beam and receive beam separately using existing beam management procedures, then beam selection can be performed, but communication reliability is insufficient
Solution Approach 1:
The patent combines transmit beam determination and receive beam determination into a unified beam management procedure. The first terminal apparatus determines both its transmit beam and receive beam based on channel measurement results from a single set of reference signal exchanges with the second terminal apparatus, rather than performing separate beam management procedures for each beam type.
Solution Approach 2:
The patent implements a feedback mechanism where the second terminal apparatus measures channel quality based on received reference signals and feeds back channel measurement results to the first terminal apparatus. The first terminal apparatus uses this feedback information to determine both transmit and receive beams, enabling reliable communication through informed beam selection based on actual channel conditions.
2Measurement precision
If multiple reference signals are exchanged for comprehensive channel measurements, then beam determination accuracy improves, but resource overheads increase
Solution Approach 1:
The patent makes the exchanged reference signals serve multiple functions: they are used for channel measurement by both terminal apparatuses, for determining transmit beams, and for determining receive beams. This multi-functional use of the same reference signals eliminates the need for separate reference signal exchanges for different beam determination purposes, reducing resource overhead while maintaining measurement accuracy.
Solution Approach 2:
The patent performs comprehensive channel measurements using exchanged reference signals before actual data transmission begins. Both terminal apparatuses use these preliminary measurement results to determine their transmit and receive beams in advance, ensuring that beam selection is based on accurate channel knowledge without requiring additional measurement resources during the data transmission phase.
Data Source
AI summary
This application pertains to the field of communication technologies, and provides a communication method and apparatus, to improve reliability of communication of a terminal apparatus in a sidelink (SL). In the method, a first terminal apparatus may determine a transmit beam based on M first channel measurement results carried in M first signals, and determine a receive beam based on M second channel measurement results corresponding to the M first signals. In this method, the first terminal apparatus may determine both a transmit beam and a receive beam for subsequent signal sending and receiving, so that reliability of communication of the first terminal apparatus can be improved. In addition, this method simplifies a beam management procedure, to reduce resource overheads and improve resource utilization.