User Equipment Synchronization on Different Carriers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, especially for Vehicle-to-Everything (V2X) communications, synchronizing devices on different frequencies poses challenges, particularly when devices are outside the coverage of a base station, leading to interference with cellular communications and reduced reliability of V2X operations.
Innovation Solution
A method where a first user equipment (P-UE) receives a V2X message from a second UE (V-UE) through a different carrier, using configuration information from the eNB to synchronize, allowing for efficient synchronization by tuning time and frequency with GPS or cellular signals, and transmitting V2X messages only during specific times to reduce battery consumption and avoid collisions with cellular communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE performs V2X communication on a different frequency carrier, then V2X communication capability is enabled, but synchronization difficulty increases and interference with cellular communication occurs
Solution Approach 1:
The patent introduces a synchronization reference signal (SSB) transmitted by the gNB as an intermediary to facilitate synchronization between UEs on different frequency carriers. The SSB provides a common reference that UEs can use to align their timing and frequency, thereby enabling V2X communication on different carriers without direct UE-to-UE synchronization complexity
Solution Approach 2:
The patent segments the communication process into distinct phases: cellular communication on the first carrier and V2X communication on the second carrier. By separating these functions onto different frequency resources and time resources, the system enables multi-carrier operation while managing synchronization complexity through dedicated reference signals for each carrier type
2Reliability
If a UE continuously monitors V2X messages on a different carrier, then V2X communication reliability is improved, but battery consumption increases
Solution Approach 1:
The patent implements periodic monitoring of V2X messages instead of continuous monitoring. The UE monitors V2X messages at specific periodic intervals configured by the network, which maintains V2X communication reliability by ensuring regular updates while significantly reducing battery consumption compared to continuous monitoring
Solution Approach 2:
The patent enables dynamic switching between monitoring modes based on communication requirements. The UE can dynamically adjust its monitoring behavior - switching between monitoring V2X messages on the different carrier and monitoring cellular communications on the serving carrier - thereby optimizing the balance between reliability and energy consumption based on current network conditions and service requirements
3Adaptability or versatility
If a UE simultaneously communicates on two different carriers, then communication versatility is improved, but signal reception capability deteriorates
Solution Approach 1:
The patent segments communication resources by separating cellular communication and V2X communication onto different frequency carriers with dedicated time resources. The UE receives cellular downlink messages on the serving frequency and V2X messages on the different carrier at different times, thereby enabling multi-carrier communication while maintaining signal reception capability through resource division
Solution Approach 2:
The patent uses the gNB as an intermediary that coordinates and manages the UE's communication on multiple carriers. The gNB provides synchronization signals and configures resource allocation, acting as a central coordinator that enables the UE to operate on multiple carriers without the UE needing to independently manage the complexity of simultaneous multi-carrier reception
4Productivity
If V2X messages are transmitted without time limitation, then communication efficiency is improved, but collision with cellular communication increases
Solution Approach 1:
The patent implements periodic transmission of V2X messages at configured intervals rather than continuous transmission. This periodic approach maintains V2X communication efficiency by ensuring regular message delivery while reducing overall transmission activity, thereby minimizing potential interference with cellular communication resources
Solution Approach 2:
The patent enables dynamic resource allocation where the UE transmits V2X messages only during allocated time resources on the different carrier, while transmitting cellular messages during allocated time resources on the serving carrier. This dynamic time-division approach allows efficient V2X communication while preventing collisions with cellular communication through network-coordinated resource management
Data Source
AI summary
Provided are a synchronization method of first user equipment (P-UE) in a wireless communication system and user equipment using the method. The method involves receiving a V2X (vehicle-to-everything) message, sent by second user equipment (V-UE) via a second carrier, and performing synchronization on the basis of the V2X message. The first user equipment (P-UE) communicates with a base station via a first carrier, wherein the first carrier differs from the second carrier.