PDCCH Resource Allocation Using Frequency-Distance Constraints
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Solution Overview
Problem
PDCCH resource fragmentation occurs during PDCCH resource allocation in LTE and 5G systems, leading to inefficiencies in resource allocation and reduced success rates.
Innovation Solution
A method where the network device allocates PDCCH resources to terminal devices by ensuring a specific distance condition is met between frequency domain positions, reducing randomization and minimizing fragmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PDCCH resources are allocated sequentially starting from the start position of the blind detection sequence, then the allocation process is simple and follows a deterministic order, but PDCCH resource fragmentation occurs and the success rate of resource allocation decreases
Solution Approach 1:
The patent changes the allocation parameter from sequential indexing to distance-based positioning. Instead of allocating resources in the order of blind detection sequence indices, the network device calculates the actual frequency domain positions of PDCCH candidates and allocates resources based on meeting a minimum distance threshold with previously allocated resources. This parameter change transforms the allocation from a simple sequential process to one that optimizes resource distribution, reducing fragmentation and improving allocation success rate.
2Ease of operation
If PDCCH resources are allocated based on blind detection sequence order, then the allocation method is straightforward and easy to implement, but resource fragmentation increases and reduces allocation efficiency
Solution Approach 1:
The patent introduces a new dimension to the allocation process by considering the physical frequency domain position distance between PDCCH candidates, rather than just their logical sequence order. The network device determines the frequency domain position of each PDCCH candidate and compares the distance with previously allocated resources against a threshold. This dimensional addition (physical distance constraint) improves resource distribution and allocation efficiency while maintaining reasonable implementability through formula-based calculations.
3Device complexity
If sequential allocation from start position is used, then the allocation algorithm has low complexity and is easy to compute, but the distribution of PDCCH resources becomes fragmented
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the frequency domain positions of all PDCCH candidates before the actual resource allocation process. The network device determines the frequency domain position of each PDCCH candidate based on the search space configuration and aggregation level, then uses these pre-determined positions to make allocation decisions that ensure minimum distance separation. This preliminary positioning action enables more uniform resource distribution without significantly increasing allocation algorithm complexity.
Data Source
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AI summary
This application is applicable to the field of communication technologies. Embodiments of this application provide a resource allocation method, an apparatus, and a system, to resolve a problem that PDCCH resource fragmentation is prone to occur during PDCCH resource allocation. The resource allocation method provided in embodiments of this application includes: determining at least two PDCCH resources for at least two terminal devices, where the at least two PDCCH resources are in a one-to-one correspondence with the at least two terminal devices, and a distance between a frequency domain position of each of the at least two PDCCH resources and a reference frequency domain position meets a preset condition, or a distance between frequency domain positions of two PDCCH resources that are adjacent in frequency domain in the at least two PDCCH resources meets a preset condition; and respectively sending information to the at least two terminal devices on the at least two PDCCH resources.