Unlicensed Sidelink Resource Allocation Outside Base Station Coverage
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Solution Overview
Problem
The existing 5G C-V2X communication systems face challenges in securing the amount of transmitted data and maintaining reliability due to external obstacles, especially when user equipment is outside the base station coverage, necessitating the use of unlicensed bands for sidelink communication.
Innovation Solution
User equipment is equipped with pre-configuration information to autonomously determine and allocate resources for sidelink communication in unlicensed bands, using a priority threshold value and identifying search frequency lists and anchor carriers to establish connections with other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment uses licensed band for C-V2X communication, then communication reliability is improved, but coverage area is limited to base station range
Solution Approach 1:
The patent segments the communication system into two parts: licensed band for control signaling and unlicensed band for data transmission. This allows the system to maintain reliable control communication within base station coverage while extending data transmission capability to areas outside coverage through unlicensed band sidelink communication.
Solution Approach 2:
The patent introduces unlicensed band as an intermediary medium that enables communication between user equipment outside base station coverage. The pre-configuration information acts as a mediator that allows autonomous resource allocation and connection establishment in the unlicensed band, bridging the gap where licensed band cannot reach.
2Area of stationary object
If user equipment autonomously allocates resources in unlicensed band, then coverage area is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring resource allocation parameters, priority thresholds, and connection establishment rules in the user equipment before entering areas outside base station coverage. This pre-configuration enables autonomous operation in unlicensed band without requiring complex real-time decision-making, thus extending coverage while managing device complexity.
3Area of stationary object
If user equipment establishes sidelink connection outside base station coverage, then coverage area is improved, but communication reliability deteriorates
Solution Approach 1:
The patent applies local quality by using different communication modes for different locations: licensed band with base station coordination for areas within coverage, and unlicensed band with autonomous sidelink for areas outside coverage. The system dynamically adapts the communication quality and resource allocation strategy based on the local coverage condition.
Data Source
AI summary
According to various embodiments, a first user equipment (UE) includes a memory; a transceiver to transmit and receive a wireless signal; and a processor connected with the memory and the transceiver, wherein the processor is configured to determine to perform communication through a sidelink on unlicensed band with a second UE while the first UE is in a state which is out of coverage of a base station, based on the determination, identify pre-configuration information stored in the memory, obtain a priority threshold value for the sidelink on the unlicensed band from the pre-configuration information, and determine, based on the priority threshold value, whether to transmit data through the sidelink on the unlicensed band with the second UE.