Wireless Paging Relay Path Selection for V2X UEs
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately and efficiently performing signal transmission and reception procedures, particularly in scenarios involving vehicle-to-everything (V2X) communication, where direct links between user equipment (UEs) are established without a base station, necessitating improved methods for paging signal delivery.
Innovation Solution
A method involving a first user equipment (UE) configuring a direct and indirect path to a base station (BS) for receiving paging signals, utilizing a common search space (CSS) in an active bandwidth part (BWP) of the direct path, and requesting a second UE to relay the signal if the CSS is not configured, ensuring reliable signal reception through either path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If direct path configuration is used for V2X communication, then communication latency is reduced, but signal reception reliability deteriorates when CSS is not configured in active BWP
Solution Approach 1:
The patent introduces a relay UE as an intermediary node to transmit paging signals to remote UEs when direct path CSS is not configured. The relay UE receives paging signals from the gNB and forwards them to the remote UE via sidelink, ensuring reliable signal reception while maintaining the low-latency direct path architecture for V2X communication.
2Reliability
If indirect path through relay UE is used, then signal reception reliability is improved, but communication complexity increases
Solution Approach 1:
The patent implements dynamic path selection where the network dynamically determines whether to use direct or indirect paths based on CSS configuration status. The gNB configures UE with indication information that specifies the appropriate path, and the UE adapts its behavior accordingly, avoiding fixed complex routing while enabling reliability when needed.
Solution Approach 2:
The relay UE acts as a coordinated intermediary that only activates when necessary, as indicated by the gNB. This dynamic intermediary approach avoids constant complexity while providing reliability enhancement only when the direct path is unavailable.
3Device complexity
If paging signal transmission uses traditional base station only path, then system simplicity is maintained, but communication capacity and reliability for remote UEs deteriorate
Solution Approach 1:
The patent extends the traditional base station-only paging transmission by adding a spatial dimension through relay UEs. When direct path CSS is unavailable, the system utilizes the sidelink dimension to deliver paging signals, effectively increasing communication capacity without fundamentally redesigning the entire system architecture.
Solution Approach 2:
The relay UE serves multiple functions: it acts as a regular UE for V2X communication, a relay node for paging signal transmission, and a bridge between direct and indirect paths. This multi-functionality increases system capacity while maintaining relative simplicity by reusing existing UE hardware and protocols.
Data Source
AI summary
In the present disclosure, a method of receiving a signal by a first user equipment (UE) in a wireless communication system, may comprise performing a first configuration procedure for a direct path to a base station (BS); performing a second configuration procedure for an indirect path to the BS, based on a second UE connected to the BS; and receiving, from the BS, a paging signal through at least one of the direct path and the indirect path, wherein, based on that a common search space (CSS) set for paging is configured in an active bandwidth part (BWP) of the direct path, the paging signal may be received through the direct path, and wherein, based on that the CSS set for paging is not configured in the active BWP of the direct path, the first UE may request the second UE to relay the paging signal from the BS through the indirect path.