Radio Terminal ProSe Relay Control Modes
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Solution Overview
Problem
Current radio terminal and base station technologies in 3GPP mobile communication systems face challenges in efficiently managing proximity-based services (ProSe) for relay operations, particularly in determining optimal control modes based on signal reception and transmission levels, which affects network coverage and resource allocation.
Innovation Solution
The implementation of a radio terminal and base station that can execute three control modes: direct communication, relay-assisted communication, and hybrid communication, selecting the mode based on signal reception and transmission levels, and utilizing a relay terminal to facilitate ProSe services by determining the execution area through specific criteria and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio terminal directly communicates with the base station, then communication reliability is improved, but network coverage is limited
Solution Approach 1:
The patent introduces a relay terminal as an intermediary device between the radio terminal and base station. The relay terminal receives signals from the base station and forwards them to the radio terminal (and vice versa), enabling extended network coverage while maintaining communication reliability through the relay assistance indicator mechanism
2Area of stationary object
If relay terminals are used to extend coverage, then network coverage is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of relay operations through the relay assistance indicator, which allows the radio terminal to adaptively select between direct communication mode and relay-assisted communication mode based on current signal conditions and power availability, thereby optimizing power consumption while maintaining extended coverage capability
3Area of stationary object
If relay terminals are deployed, then network coverage is improved, but system complexity increases
Solution Approach 1:
The patent manages system complexity by controlling the activation and deactivation of relay terminals through parameter changes in the relay assistance indicator. This allows the system to dynamically adjust the number of active relays based on coverage requirements, preventing unnecessary complexity while maintaining the capability for extended coverage when needed
Data Source
AI summary
A radio terminal (controller) executes one of a first control, a second control, and a third control, based on at least one of a reception level of a radio signal from a predetermined cell and a transmission level of the radio terminal. In the first control, the radio terminal directly transmits uplink information to be transmitted to a predetermined cell to the predetermined cell, and directly receives downlink information to be received by the radio terminal from the predetermined cell. In the second control, the radio terminal transmits the uplink information to the predetermined cell via a relay terminal configured to execute a relay using a proximity-based service, and directly receives the downlink information from the predetermined cell. In the third control, the radio terminal transmits the uplink information to the predetermined cell via the relay terminal, and receives the downlink information from the predetermined cell via the relay terminal.