Adaptive Sidelink Periodicity for UE Distance and Direction Tracking
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Solution Overview
Problem
There is a need for a mechanism to determine the distance and direction between two user equipment (UEs) within network coverage, particularly in 5G New Radio (NR) wireless networks, and to determine how often such measurements should be performed as the UEs move closer to or further away from each other.
Innovation Solution
A first UE establishes a sidelink channel with a second UE using a resource set provided by a cell, sets a timer based on the indicated distance, and upon expiration without receiving a new resource set, initiates a new sidelink channel using the same resource set to repeatedly determine distance and direction, adjusting the interval based on the relative movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic sidelink channel establishment is performed frequently to track UE movement, then measurement precision and collision prevention improve, but resource consumption and system complexity increase
Solution Approach 1:
The patent applies dynamics by making the sidelink channel periodicity adaptive rather than fixed. The network configures different time periods for sidelink channel establishment based on UE movement status - when UEs are moving closer or further apart, the system adjusts the frequency of distance measurements and channel re-establishments. This dynamic adjustment optimizes measurement precision while avoiding excessive resource consumption during stable periods.
Solution Approach 2:
The system changes the time period parameter for sidelink channel establishment based on detected UE movement patterns. When movement is detected (UEs moving closer or further apart), the system reduces the time period to increase measurement frequency. When UEs are stationary, the time period is extended to reduce complexity. This parameter adaptation resolves the contradiction between measurement precision and system complexity.
2Reliability
If sidelink channel establishment is performed continuously to maintain accurate location tracking, then reliability of collision prevention improves, but resource consumption increases
Solution Approach 1:
The patent implements periodic action by establishing sidelink channels at configured time periods rather than continuously. The network provides configuration information including time periods for sidelink channel establishment, allowing UEs to perform distance and direction measurements periodically. This approach maintains sufficient reliability for collision prevention while significantly reducing resource consumption compared to continuous monitoring.
Solution Approach 2:
The system uses self-service by having UEs autonomously determine whether to re-establish sidelink channels based on timer expiration and movement detection. When the configured time period expires and UEs are still within coverage, they automatically initiate new sidelink channel establishment without continuous network intervention. This autonomous operation reduces signaling overhead and resource consumption while maintaining reliability.
3Loss of energy
If the time period for sidelink channel establishment is extended to reduce communication frequency, then resource consumption decreases, but response time to UE movement increases
Solution Approach 1:
The system dynamically adjusts the time period for sidelink channel establishment based on UE movement status. When UEs are detected to be moving closer or further apart, the system reduces the time period to improve response time. When UEs are stationary or movement is minimal, the time period is extended to reduce resource consumption. This dynamic adaptation resolves the trade-off between response time and resource consumption.
Data Source
AI summary
A method for a first UE to perform sidelink communication with a second UE is provided. The method receives a first resource set from a cell to establish a first sidelink channel with the second UE, the first resource set indicating at least a first distance between the first and second UEs. The method establishes the first sidelink channel with the second UE based on the first resource set and transmits a set of parameters associated with the first sidelink channel to the cell. The method also sets a first timer based on at least the first distance, the first timer for determining when to establish a second sidelink channel with the second UE. When the first timer is expired and no second resource set is received from the cell, the method establishes the second sidelink channel with the second UE based on the first resource set.