Unicast Communication Relay Selection Using Transmission Quality
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Solution Overview
Problem
Existing wireless communication systems face challenges in selecting an appropriate relay UE for unicast connections due to insufficient hardware capabilities, limiting communication distance and scenario applicability, and lack of effective methods for establishing reliable unicast connections between UEs.
Innovation Solution
A unicast communication method that involves a relay device determining transmission quality based on RSRP, SNR, SINR, or CSI to select an appropriate relay device for unicast connections, using preset conditions and indication information to adjust criteria for selecting the best relay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay device selection is performed without transmission quality determination, then connection establishment speed is improved, but connection reliability deteriorates
Solution Approach 1:
The relay device performs transmission quality determination on messages before forwarding them to terminal devices. This preliminary action of evaluating RSRP, SNR, SINR, or CSI metrics prevents poor-quality connections from being established, thereby improving connection reliability without requiring complex post-establishment remediation mechanisms.
Solution Approach 2:
The system implements feedback mechanisms where relay devices report transmission quality metrics to terminal devices and network entities. This feedback enables informed selection of relay devices based on actual channel conditions, improving connection success rates while maintaining manageable complexity through standardized reporting procedures.
2Length of stationary object
If multiple relay devices are used to extend communication distance, then communication coverage is improved, but difficulty in selecting appropriate relay devices increases
Solution Approach 1:
The patent employs multiple measurable parameters (RSRP, SNR, SINR, CSI) to characterize relay device performance and channel conditions. By changing from single-metric to multi-metric evaluation, the system can effectively compare and select among multiple relay devices, making the selection process more accurate despite increased complexity.
Solution Approach 2:
The relay device acts as an intermediary that not only forwards messages but also performs quality determination and selection functions. This intermediary role simplifies the overall selection difficulty by centralizing the evaluation process at the relay device level, which has direct access to transmission quality measurements.
3Reliability
If transmission quality determination is performed, then connection quality is improved, but processing time increases
Solution Approach 1:
The relay device performs transmission quality determination selectively rather than for every possible connection attempt. By applying quality checks only when necessary (e.g., when multiple relays are available or when initial connections fail), the system maintains good connection quality while minimizing the time penalty associated with continuous quality monitoring.
Data Source
AI summary
This application provides a unicast communication method and apparatus. The method includes: A first relay device receives a first message sent by a first terminal device, where the first message includes a first identifier of a second terminal device. The first relay device sends a second message to the second terminal device when transmission quality of the first message meets a first preset condition, where the second message is for establishing a first unicast connection, and the first unicast connection is a unicast connection established between the first terminal device and the second terminal device through the first relay device. According to the unicast communication method provided in this application, an appropriate relay device is selected in a unicast connection establishment process. This helps improve a success rate of the unicast connection and communication quality of unicast communication.