Relay Terminal Discovery and Selection in Communication Systems

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Solution Overview

Problem

Current communication systems face challenges in efficiently discovering and selecting relay terminals for service coverage extension, particularly in high-frequency bands, which affects the performance and coverage of communication services like eMBB, URLLC, and mMTC.

Innovation Solution

The method involves a remote terminal receiving a discovery signal from neighboring terminals, performing measurements, determining candidate terminals, and selecting a relay terminal, with configuration information from a base station guiding the beam sweeping operation and resource allocation for sidelink setup.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If relay communication is used to extend service coverage in high-frequency bands, then communication coverage is improved, but the complexity of discovering and selecting relay terminals increases

Engineering Contradiction:

Improveservice coverage areaVSAvoidrelay terminal discovery and selection complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The relay terminal discovery process is segmented into distinct phases: discovery signal transmission, measurement operation, candidate terminal determination, and relay terminal selection. This segmentation allows each phase to be optimized independently, reducing overall system complexity while extending coverage through systematic relay deployment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Discovery signals are transmitted in advance by neighboring terminals before actual relay communication is established. This preliminary action enables remote terminals to perform measurements and identify candidate relay terminals proactively, reducing the complexity of real-time relay selection and enabling seamless coverage extension

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If measurement operations are performed on discovery signals from multiple neighboring terminals, then relay terminal selection accuracy is improved, but the time required for relay discovery increases

Engineering Contradiction:

Improverelay terminal selection accuracyVSAvoidrelay discovery time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

Instead of measuring all discovery signals from all neighboring terminals equally, the system performs measurement operations on a selected subset of discovery signals. Remote terminals can prioritize measurements based on signal strength indicators or other criteria, achieving sufficient selection accuracy without the time cost of exhaustive measurement of every possible relay candidate

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system dynamically adjusts measurement parameters such as measurement thresholds, measurement periodicity, and candidate selection criteria based on channel conditions and service requirements. This allows the system to maintain high selection accuracy while reducing measurement time by adapting the measurement operation intensity to actual needs

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If configuration information for beam sweeping and resource allocation is provided by base station, then sidelink setup accuracy is improved, but the signaling overhead increases

Engineering Contradiction:

Improvesidelink setup accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Manufacturing precisionVSLoss of information

Solution Approach 1:

Configuration information is provided with local quality optimization: beam sweeping configuration and resource allocation parameters are tailored specifically to the local channel conditions and service requirements of each remote terminal. This targeted approach achieves high sidelink setup accuracy without the overhead of providing comprehensive configuration information to all terminals uniformly

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The base station provides configuration information selectively rather than comprehensively. Only the essential configuration parameters needed for successful sidelink setup are transmitted, omitting redundant or optional configuration elements. This partial provision of configuration information maintains setup accuracy while reducing signaling overhead

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11800599B2Method for discovering and selecting relay user equipment in communication system

Publication Date: 2023.10.24 ELECTRONICS & TELECOMM RES INST

AI summary

An operation method performed by a remote terminal in a communication system includes: receiving a discovery signal from each of one or more neighboring terminals; performing a measurement operation on the discovery signal; determining at least one candidate terminal from among the one or more neighboring terminals based on a result of the measurement operation; selecting a relay terminal within the at least one candidate terminal; and performing a sidelink setup procedure with the relay terminal.