Carrier Aggregation Resource Selection for D2D Communication
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Solution Overview
Problem
In device-to-device/vehicle-to-everything communication systems, the existing resource selection methods for carrier aggregation do not ensure an appropriate resource subset for multiple carriers, leading to suboptimal channel utilization and increased interference.
Innovation Solution
A method that initializes multiple resource pools for each carrier, excludes expected-busy resources based on channel signal strength, and determines a stopping criterion for resource exclusion, allowing for accurate selection of a resource subset by treating all resource pools as a candidate pool and adjusting the comparison threshold as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing resource selection method is applied to each carrier independently, then resource selection can be performed on multiple carriers, but the final resource subset is not appropriate due to different channel use status on each carrier
Solution Approach 1:
The patent combines resource pools from multiple carriers into a unified candidate resource pool for joint resource selection. Instead of independently selecting resources on each carrier, the method aggregates all resource pools and performs unified resource subset selection, ensuring that the final resource subset accounts for channel conditions across all carriers simultaneously.
Solution Approach 2:
The patent creates a universal candidate resource pool that encompasses resources from multiple carriers with different channel characteristics. This unified pool allows the resource selection mechanism to function across heterogeneous carrier conditions, selecting resources that are appropriate for the overall system rather than optimizing for individual carriers in isolation.
2Ease of operation
If resource selection is performed autonomously by UE without base station scheduling, then UE can select resources independently, but channel utilization status prediction becomes complex requiring sensing and decoding operations
Solution Approach 1:
The patent performs preliminary sensing and channel status prediction during a sensing period before actual resource selection. By pre-monitoring channel occupation status and decoding SCI messages in advance, the UE prepares resource status information that simplifies the subsequent resource selection process, avoiding the need to perform complex sensing operations at the moment of resource selection.
Solution Approach 2:
The patent enables UE to autonomously perform sensing, channel status prediction, and resource selection without base station intervention. The UE independently monitors PSSCH, decodes SCI messages, predicts future channel occupation status, and selects resources from the candidate pool, making the system self-sufficient and reducing control signaling overhead.
3Productivity
If SPS is adopted for autonomous transmission, then UE can use allocated resources periodically, but future resources may be reserved that are no longer appropriate due to changing channel conditions
Solution Approach 1:
The patent implements dynamic resource selection by periodically re-evaluating channel conditions and updating the candidate resource pool. Instead of statically allocating resources for long periods, the system adapts resource selection to changing channel conditions by performing fresh sensing and prediction at each resource selection opportunity, ensuring resources remain appropriate despite channel variations.
Solution Approach 2:
The patent uses feedback from continuous channel monitoring and sensing to update resource selection decisions. By monitoring channel occupation status and decoding SCI messages ongoing, the system receives feedback about current and future channel conditions, which informs resource selection to ensure chosen resources will remain appropriate for transmission.
Data Source
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AI summary
A resource selection method and apparatus for device-to-device/vehicle-to-everything communication supporting carrier aggregation are disclosed. The resource selection method includes: initializing at least two resource pools, wherein each resource pool corresponds to one carrier; excluding an expected-busy resource from each resource pool associated with a resource of which channel signal strength is greater than a comparison threshold during a sensing period; determining whether remaining resources of a candidate resource pool meet a criterion for stopping resource exclusion, wherein the candidate resource pool comprises a portion of or all the resource pools, and the criterion comprises that a criteria parameter of the candidate resource pool is greater than or equal to a preset threshold of the criteria parameter; selecting a resource subset from the remaining resources of the candidate resource pool when the criterion is met, and otherwise incrementing the comparison threshold.