Relay Service Data Transfer in Wireless Terminals
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Solution Overview
Problem
In wireless communication systems, when a terminal leaves network coverage, maintaining connection by transferring service data to a relay terminal is challenging due to changing channel quality, which can result in delayed or failed service transfer.
Innovation Solution
A method where a first terminal determines a service switch condition, such as low channel quality or signal intensity, and proactively transfers service data to a second terminal acting as a relay, enabling communication with the base station, using existing RRC signaling for multiplexing and improving compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal waits for base station instructions to transfer service data, then the base station can control the transfer process, but the service transfer may be delayed or fail when RRC messages are not received correctly
Solution Approach 1:
The terminal autonomously determines service switch conditions based on channel quality measurements and automatically triggers service data transfer to the relay terminal without waiting for base station instructions. This self-service mechanism ensures service transfer continues even when RRC messages are not received correctly, resolving the contradiction between reliability and control complexity.
Solution Approach 2:
The terminal pre-configures service switch conditions and relay terminal information in advance. When channel quality deteriorates, the terminal can immediately execute the pre-planned service transfer without waiting for base station confirmation, ensuring timely response while maintaining base station awareness through subsequent reporting.
2Speed
If the terminal proactively transfers service data based on service switch conditions, then service transfer speed improves, but the risk of incorrect transfer decisions increases
Solution Approach 1:
The terminal continuously monitors channel quality indicators (RSRP, RSRQ, SINR) and compares them against pre-configured thresholds to dynamically determine service switch conditions. This feedback mechanism ensures transfer decisions are based on real-time channel conditions, improving both speed and accuracy of transfer decisions.
Solution Approach 2:
The service switch condition is defined by configurable parameters including channel quality thresholds (absolute values or offsets), time window durations, and hysteresis margins. These parameters can be adjusted based on service requirements and channel characteristics, allowing precise control over when service transfer should occur.
3Adaptability or versatility
If the terminal uses existing RRC signaling for service transfer, then compatibility with current network infrastructure is improved, but the flexibility of service transfer control is reduced
Solution Approach 1:
The patent reuses existing RRC signaling messages (ConnectionReconfiguration, MeasurementReport, etc.) for multiple purposes including service transfer control, channel quality reporting, and relay terminal configuration. This multi-functional use of RRC signaling maintains full compatibility with current network infrastructure while enabling the new service transfer mechanism.
Solution Approach 2:
The service switch condition acts as an intermediary layer between the terminal's autonomous decision-making and the base station's control system. The terminal evaluates local channel conditions against pre-configured service switch conditions and executes transfers independently, while the base station maintains overall system control through parameter configuration and monitoring.
Data Source
AI summary
A method for transferring a service, performed by a first terminal, and including: in response to determining that a service switch condition is met, transferring service data to be transmitted between the first terminal and a base station, such that the service data is transmitted between the first terminal and a second terminal, the second terminal is operating as a relay terminal enabling communication between the first terminal and the base station.