Relay Reselection Mechanism for Sidelink Communication Interruption
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Solution Overview
Problem
Radio link failures in relay equipment can cause traffic interruptions for remote terminals, leading to prolonged disruptions due to the lack of efficient relay reselection methods in sidelink communications.
Innovation Solution
A relay reselection method and apparatus that includes monitoring units to detect triggering conditions such as T310 timer expiration, power insufficiency, or relay function termination, and transmitting reselection indication information to remote terminals to trigger relay reselection, with eNBs selecting appropriate relay equipment based on channel measurement results and identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay equipment is used to extend coverage and enable sidelink communications, then coverage area is expanded and communication capability is improved, but radio link failures in relay equipment cause traffic interruptions for remote terminals
Solution Approach 1:
The system performs preliminary relay discovery and selection before actual communication is needed. Remote terminals pre-discover available relay equipment and establish potential relay paths in advance, so when a radio link failure occurs, the terminal already has candidate relays ready to switch to, minimizing communication interruption.
Solution Approach 2:
The system implements feedback mechanisms where relay equipment monitors its own link status and provides status information to remote terminals. When a relay detects potential link failures or actual failures, it sends notifications to remote terminals, enabling them to proactively switch relays before complete communication breakdown occurs.
2Loss of time
If relay reselection is implemented to reduce traffic interruption time, then communication continuity is improved, but system complexity increases due to additional monitoring and selection mechanisms
Solution Approach 1:
Remote terminals autonomously monitor the status of their current relay and candidate relays, and independently perform relay reselection when failures are detected. The system distributes the intelligence for relay management to the terminals themselves rather than requiring centralized control, reducing overall system complexity while enabling rapid relay switching.
Solution Approach 2:
The relay selection process is made dynamic rather than static. Terminals continuously discover and evaluate candidate relays, maintaining an updated list of potential relays. When link failures occur, the system dynamically selects from available candidates rather than requiring complex reconfiguration, reducing interruption time while keeping mechanisms manageable.
Data Source
AI summary
Embodiments of this disclosure provide a relay reselection method and apparatus and a system; includes: relay equipment monitors a triggering condition for relay reselection; the relay equipment judges whether the triggering condition for relay reselection is met; and the relay equipment transmits relay reselection indication information to a remote terminal taking the relay equipment as a relay when the triggering condition for relay reselection is met, to indicate the remote terminal to perform relay reselection; wherein, the triggering condition for relay reselection is that an air interface channel of the relay equipment is out of synchronization or is about to be out of synchronization, or a notification of terminating a relay function is received, or power of the relay equipment is insufficient. With the embodiments of this disclosure, a time of interruption due to a poor relay link may be reduced, and occurrence of long-time traffic interruption may be avoided.