Relay Selection Assistance Information for D2D Throughput
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Solution Overview
Problem
Current relay selection methods in D2D communication do not adequately consider various metrics that could impact throughput, such as system bandwidth, Radio Access Technology, and base station load, leading to suboptimal relay choices for remote UEs.
Innovation Solution
Radio terminals receive selection assistance information from relay terminals, which includes metrics like frequency band, system bandwidth, downlink transmission power, uplink/downlink configuration, and Radio Access Technology, allowing remote UEs to select suitable relay terminals based on these factors for improved throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If relay selection is performed without considering multiple metrics (system bandwidth, RAT, base station load), then the relay selection process is simple, but the throughput and communication performance are suboptimal
Solution Approach 1:
The base station performs preliminary actions by calculating and preparing selection assistance information (SAI) that includes multiple metrics (system bandwidth, RAT type, base station load) before the relay selection process. This pre-computed information is then provided to remote UEs, enabling them to make informed relay selections without the UE needing to perform complex measurements and calculations itself, thus improving throughput while maintaining relatively simple UE-side processing
Solution Approach 2:
The base station acts as an intermediary that collects information about multiple relay terminals and their associated metrics, then processes this information to generate SAI. This intermediary role allows the base station to handle the complexity of multi-metric evaluation centrally, while remote UEs can perform relay selection based on the simplified SAI provided by the base station, resolving the contradiction between selection accuracy and process complexity
2Reliability
If relay selection considers only basic metrics, then the selection process is fast and simple, but the appropriateness of relay selection is insufficient
Solution Approach 1:
The selection assistance information provides localized quality metrics for each relay terminal specifically, including system bandwidth available at that relay, the Radio Access Technology type, and base station load conditions. This per-relay customized information allows remote UEs to evaluate each relay candidate's specific capabilities and suitability, improving selection appropriateness without requiring the UE to implement complex evaluation algorithms
Solution Approach 2:
The invention changes the parameters provided to UEs from simple signal strength measurements to comprehensive selection assistance information including system bandwidth, RAT type, and base station load. These parameter changes enable more accurate relay selection by providing physically meaningful metrics that directly relate to throughput potential, while the base station handles the complexity of obtaining and processing these parameters
Data Source
AI summary
A relay terminal (2) transmits selection assistance information to a remote terminal (1). The selection assistance information includes a first information element transmitted from a base station (3) and received by the relay terminal (2). The first information element indicates at least one of: (a) a frequency band of the base station (3); a system bandwidth; downlink transmission power; UL/DL configuration; the number of cells provided to the relay terminal; a type of a cell; a RAT or a communication scheme used between the base station (3) and the relay terminal (2); and a name or identifier of a mobile operator providing the base station. This is thus, for example, possible to contribute to improving appropriateness of a relay selection.