Reserved Subframe Allocation for V2X Resource Pool Bitmap Alignment
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Solution Overview
Problem
In V2V/V2X communication systems, the existing methods for configuring resource pools for sidelink signals face challenges due to non-integer bitmap repetition within the system frame number cycle, leading to resource collisions and inefficiencies.
Innovation Solution
A method is introduced to set reserved subframes within the system frame number cycle, ensuring that the bitmap is repeated by integer times within the remaining subframes after excluding reserved and predefined subframes. This is achieved by determining the number and positioning of reserved subframes such that at most two reserved subframes are set per n subframes, minimizing resource waste and sidelink transmission latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bitmap size is configured to be 20 or 100 bits, then the resource pool configuration can be simplified, but the remaining subframes after excluding SLSS subframes cannot be divided by the bitmap size, causing resource collision problems
Solution Approach 1:
The patent extracts and identifies specific subframes as 'reserved subframes' that must be excluded from the resource pool. By taking out these reserved subframes (where SLSS is transmitted) from the total subframe count, the remaining subframes can be evenly divided by the bitmap size, eliminating resource collision problems while maintaining simple bitmap-based configuration.
2Stability of the object's composition
If reserved subframes are excluded from the resource pool, then the bitmap can be repeated by integer times within the remaining subframes, but the number of available resources for sidelink transmission is reduced
Solution Approach 1:
The patent applies preliminary action by pre-identifying and reserving specific subframes before the actual resource allocation process. These reserved subframes are predetermined to be excluded from the resource pool, ensuring that the remaining subframes can be evenly divided by the bitmap size. This preliminary reservation stabilizes the bitmap repetition pattern while the system optimizes resource utilization within the remaining available subframes.
3Ease of operation
If the bitmap is applied from the start or certain offset of SFN/DFN cycle, then resource reservation can be simplified, but resource collision occurs in the next DFN/SFN cycle due to non-integer bitmap repetition
Solution Approach 1:
The patent resolves this contradiction by extracting reserved subframes from the SFN/DFN cycle, ensuring that the remaining subframes form an integer number of bitmap repetitions. This extraction eliminates the boundary crossing issue and prevents resource collision in the next cycle, while the bitmap can still be applied from the start or certain offsets for simplified operation.
Data Source
AI summary
The present disclosure provides a method of setting reserved subframes for indication of a resource pool by a bitmap, a user equipment, and a base station. In the present disclosure, the resource pool is used for transmitting or receiving sidelink signals within a system frame number cycle that includes predefined subframes and remaining subframes that are subframes after excluding the predefined subframes within the system frame number cycle. In the method, a number of the reserved subframes is determined so that the bitmap is repeated by integer times within the subframes after excluding the reserved subframes and the predefined subframes within the system frame number cycle. In the method, position of each of the reserved subframes is set, wherein at most two reserved subframes are set per n subframes within the system frame number cycle.