Carrier Selection via CBR Threshold Aggregation
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, parallel sidelink transmissions on congested carriers exacerbate congestion, as user equipment (UE) independently selects resources on each carrier without considering overall network load, leading to inefficient channel utilization.
Innovation Solution
A method where UE selects carriers based on Channel Busy Ratio (CBR) thresholds provided by the network, aggregating resources from carriers with CBR values below the threshold and, if necessary, additional carriers with higher CBR values, to optimize resource allocation for sidelink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE performs parallel sidelink transmissions on multiple carriers independently, then transmission capacity is improved, but channel congestion increases
Solution Approach 1:
The patent combines multiple carriers into an aggregated carrier for sidelink transmissions. Instead of treating each carrier independently, the UE aggregates resources from multiple carriers (particularly those with CBR below threshold) to create a unified transmission resource pool, thereby improving transmission capacity while managing congestion through coordinated resource selection across carriers.
Solution Approach 2:
The patent applies different selection criteria to different carriers based on their local conditions (CBR values). Carriers with CBR below the threshold are preferred for aggregation, while carriers with CBR above the threshold are avoided or used only when necessary. This local quality approach ensures that transmissions are directed to carriers with better channel conditions, reducing overall congestion.
2Productivity
If UE selects carriers based on CBR threshold, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
The network performs preliminary actions by providing CBR threshold information to UEs before the UEs need to make carrier selection decisions. This allows UEs to have pre-configured criteria for carrier selection, reducing the complexity of real-time decision-making while maintaining efficient resource allocation based on network conditions.
Solution Approach 2:
The patent uses CBR (Channel Busy Ratio) as a key parameter to dynamically adjust carrier selection. By monitoring and comparing CBR values against thresholds, the system adapts resource allocation to changing channel conditions without requiring complex algorithms, achieving efficient resource allocation through parameter-based decision making.
3Productivity
If UE aggregates resources from multiple carriers, then network throughput is improved, but measurement and selection difficulty increases
Solution Approach 1:
The network provides feedback to UEs in the form of CBR threshold information and carrier configuration data. This feedback mechanism guides UEs on which carriers to aggregate and how to select resources, reducing the difficulty of carrier measurement and selection while enabling effective multi-carrier resource aggregation to improve network throughput.
Data Source
AI summary
Provided are a method of selecting carriers and a device supporting the method. According to one embodiment of the present invention, a method for selecting carriers in a wireless communication system includes: receiving information on carriers and Channel Busy Ratio threshold from a network; selecting at least one carrier of which CBR value is below the CBR threshold; selecting a resource on the selected carrier; and transmitting a medium access control (MAC) packet data unit (PDU) by using the selected resource of the selected carrier.