Distributed VRB Mapping With Interleaver-Based PRB Scheduling
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Solution Overview
Problem
In broadband wireless mobile communication systems, existing methods for mapping virtual resource blocks (VRBs) to physical resource blocks (PRBs) face challenges in efficiently allocating radio resources, particularly due to the restrictive nature of distributed VRB mapping rules on localized VRB mapping and the resulting bit overhead in transmission.
Innovation Solution
A resource scheduling method that uses a block interleaver to efficiently map consecutively allocated virtual resource blocks to physical resource blocks by interleaving indexes from a resource indication value, allowing for cyclic shifting of these indexes across slots, with the gap being a multiple of the square of the number of consecutive physical resource blocks in a resource block group, thereby optimizing resource allocation and reducing bit overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed VRB mapping rules are applied to achieve frequency diversity, then reliability is improved, but device complexity increases due to restrictive mapping rules affecting localized VRB mapping
Solution Approach 1:
The patent segments the VRB index space into multiple subsets and applies different mapping rules to different subsets. This allows localized VRB mapping to be performed in some subsets while distributed mapping is performed in others, thereby reducing the overall complexity of mapping rules while maintaining frequency diversity benefits.
Solution Approach 2:
The patent applies different mapping characteristics to different parts of the resource block space. Specifically, certain VRB indices are mapped using localized mapping rules while others use distributed mapping rules, allowing each region to have optimized properties for its specific use case.
2Adaptability or versatility
If detailed VRB to PRB mapping information is transmitted to enable flexible resource allocation, then adaptability is improved, but loss of information increases due to bit overhead in transmission
Solution Approach 1:
The patent extracts and transmits only the essential VRB index information rather than complete mapping details. The base station determines the specific VRB to PRB mapping based on the transmitted VRB indices and predefined mapping rules, eliminating the need to transmit extensive mapping information and thereby reducing bit overhead.
Solution Approach 2:
The patent uses predefined mapping rules that are already known to both the base station and the terminal. Instead of transmitting the actual mapping information, the base station transmits VRB indices that serve as references, and the terminal copies the mapping behavior using the same predefined rules, significantly reducing the information that needs to be transmitted.
Data Source
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AI summary
A method for efficiently scheduling virtual resource blocks to physical resource blocks is disclosed. In a wireless mobile communication system that supports a resource block group (RBG) allocation scheme, for distributed mapping of consecutively allocated virtual resource blocks to physical resource blocks, there is proposed a mapping method capable of increasing the number of distributed virtual resource blocks to a maximum while satisfying gap limitations, when the length of the physical resource blocks is different from the length of the distributed virtual resource blocks. Also, the number of distributed virtual resource blocks and the structure of an interleaver are limited for efficient scheduling.