Interleaved VRB to PRB Mapping for NR Resource Allocation
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Solution Overview
Problem
In New Radio (NR) wireless communication, the existing resource allocation methods for Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH) lead to unequal frequency diversity performance among code blocks, resulting in potential poor frequency diversity for some code blocks, especially with direct mapping from Virtual Resource Blocks (VRBs) to Physical Resource Blocks (PRBs).
Innovation Solution
The implementation of interleaving Virtual Resource Blocks (VRBs) consecutively numbered and mapping them to Physical Resource Blocks (PRBs) in a frequency-consecutive manner, which can be indicated by a bitmap or starting position indication, to equalize diversity gain between code blocks without impacting scheduling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct mapping from Virtual Resource Blocks (VRBs) to Physical Resource Blocks (PRBs) is used, then resource allocation is simple and efficient, but frequency diversity performance is unequal among code blocks
Solution Approach 1:
The patent divides the resource allocation process into two independent stages: (1) code block to VRB mapping, and (2) VRB to PRB mapping. This segmentation allows different mapping strategies to be applied at each stage, enabling frequency diversity optimization at the VRB-PRB mapping stage without affecting the simplicity of code block allocation.
Solution Approach 2:
The patent introduces Virtual Resource Blocks (VRBs) as an intermediary layer between code blocks and Physical Resource Blocks (PRBs). This intermediary enables flexible mapping relationships - code blocks can be simply mapped to VRBs, and then VRBs can be mapped to PRBs with frequency diversity considerations, thus resolving the contradiction between simplicity and performance.
2Device complexity
If VRBs are mapped directly to PRBs, then resource allocation signaling is simple, but some code blocks suffer from poor frequency diversity
Solution Approach 1:
The patent segments the mapping function into two parts: code block to VRB assignment and VRB to PRB mapping. This allows the signaling to remain simple for code block allocation while enabling complex frequency diversity optimization in the VRB-PRB mapping stage through separate control mechanisms.
Solution Approach 2:
VRBs serve as an intermediary that decouples the simple code block allocation from the complex PRB mapping requirements. This allows independent optimization of each mapping stage, maintaining signaling simplicity while achieving frequency diversity goals.
3Reliability
If interleaving is applied to distribute VRBs to PRBs, then frequency diversity is improved, but mapping complexity increases
Solution Approach 1:
The patent separates the mapping complexity into two stages: simple code block to VRB assignment, and more complex VRB to PRB mapping with interleaving. This segmentation allows the system to achieve frequency diversity while keeping the overall architecture manageable by handling complexity at the appropriate stage.
Solution Approach 2:
The VRB intermediary layer absorbs the mapping complexity, allowing interleaving and frequency diversity optimization to be implemented without directly complicating the code block allocation process. The complexity is isolated to the VRB-PRB mapping stage where it can be managed separately.
Data Source
AI summary
Provided are a base station, user equipment and wireless communication methods related to resource allocation of PDSCH/PUSCH in NR. A base station comprises: circuitry operative to allocate Physical Resource Blocks (PRBs) for data transmission based on one of a set of resource allocations; and a transmitter operative to transmit data on the PRBs to a user equipment, wherein the set of resource allocations comprises: a first resource allocation of interleaving Virtual Resource Blocks (VRBs) consecutively numbered and mapping the interleaved VRBs to the PRBs consecutive in frequency domain.