VRB-to-PRB Interleaving for Flexible Wireless Resource Allocation
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Solution Overview
Problem
In broadband wireless mobile communication systems, the existing radio resource scheduling methods face challenges in efficiently combining Frequency Selective Scheduling (FSS) and Frequency Diversity Scheduling (FDS) schemes, particularly in determining DVRB mapping rules that do not restrict LVRB mapping, leading to increased bit overhead and reduced resource allocation sophistication.
Innovation Solution
A resource block mapping method that uses a block interleaver to distribute virtual resource blocks (VRBs) to physical resource blocks (PRBs), where indexes are interleaved and cyclically shifted based on the number of consecutive PRBs in a resource block group (RBG), allowing for efficient scheduling of FSS and FDS schemes by reducing bit overhead and enhancing resource allocation granularity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If distributed virtual resource block (DVRB) mapping rules are established to combine FSS and FDS schemes, then resource allocation flexibility is improved, but mapping complexity and bit overhead increase
Solution Approach 1:
The patent segments the resource block mapping process into distinct types (localized VRB mapping and distributed VRB mapping) that can be independently selected and configured. This segmentation allows the system to apply different mapping strategies to different resource blocks, achieving flexibility without requiring complete reconfiguration of the entire mapping mechanism.
Solution Approach 2:
The patent implements dynamic mapping rules where the mapping type (localized or distributed) can be changed based on scheduling requirements and channel conditions. The mapping configuration is not fixed but can be adjusted in real-time, allowing the system to adapt to varying traffic patterns and channel states while maintaining manageable complexity through standardized procedures.
2Reliability
If distributed virtual resource block mapping is implemented to enhance frequency diversity, then communication reliability is improved, but bit overhead increases
Solution Approach 1:
The patent applies different mapping qualities to different resource blocks based on local requirements. Distributed VRB mapping is applied selectively to resource blocks where frequency diversity is needed (such as those experiencing fading), while localized mapping is used elsewhere. This local differentiation achieves reliability improvement only where necessary, minimizing overall bit overhead.
3Ease of operation
If resource block allocation is performed with fine granularity, then resource allocation sophistication is improved, but bit overhead increases
Solution Approach 1:
The patent changes the parameter of mapping type (localized vs. distributed) as a control variable that can be adjusted to achieve different levels of allocation sophistication. By modifying this parameter based on traffic requirements and channel conditions, the system can achieve fine-grained control where needed while maintaining coarser control elsewhere, thereby managing bit overhead effectively.
Data Source
AI summary
A user equipment (UE) receives downlink data using resource blocks in a wireless mobile communication system. The UE receives downlink control information including resource allocation information and downlink data mapped to physical resource blocks (PRBs) based on the downlink control information. The resource allocation information indicates virtual resource block (VRB) allocations for the UE. A resource block pair includes a first resource block associated with a first time slot and a second resource block associated with a second time slot adjacent to the first time slot. The first and second resource blocks are allocated to the same frequency indices. A mapping between VRB pairs and PRB pairs exists such that frequency consecutive VRB pairs are mapped to non-frequency consecutive PRB pairs and that each resource block pair is split so there is a frequency gap between the first and second parts of the resource block pair.