Virtual Resource Block Mapping for FSS-FDS Scheduling
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Solution Overview
Problem
In broadband wireless mobile communication systems, 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, while also managing bit overhead and resource allocation granularity.
Innovation Solution
A resource block mapping method that uses a block interleaver to distribute virtual resource blocks to physical resource blocks, with specific interleaving and cyclic shifting techniques to optimize scheduling and reduce bit overhead, allowing for efficient combination of FSS and FDS schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed virtual resource block (DVRB) mapping rules are established to combine FSS and FDS schemes, then system performance and resource allocation efficiency are improved, but device complexity and scheduling difficulty increase
Solution Approach 1:
The patent segments virtual resource blocks into localized virtual resource blocks (LVRBs) and distributed virtual resource blocks (DVRBs), which are then mapped to different physical resource block patterns. LVRBs are mapped to contiguous physical resource blocks for frequency-selective scheduling, while DVRBs are mapped to distributed physical resource blocks for frequency diversity scheduling. This segmentation allows the system to combine both FSS and FDS schemes without requiring a completely new scheduling framework, thereby improving resource allocation efficiency while managing complexity through structured division.
Solution Approach 2:
The patent introduces virtual resource blocks (VRBs) as an intermediary layer between the scheduler and physical resource blocks. The VRB-to-PRB mapping function acts as a mediator that translates high-level scheduling decisions into physical resource allocations. By using this intermediary mapping mechanism, the system can implement complex FSS-FDS combination scheduling without directly managing the complexity at the physical layer, thus improving productivity while containing device complexity through abstraction.
2Manufacturing precision
If fine-grained resource allocation is implemented to improve scheduling flexibility, then resource allocation precision is improved, but bit overhead for resource indication increases
Solution Approach 1:
The patent uses virtual resource block indices as a copy or representation of physical resource block allocations. Instead of directly indicating physical resource block positions in control messages, the system allocates virtual resource blocks and uses their indices as proxies. The VRB-to-PRB mapping function then translates these virtual indices into actual physical allocations. This copying mechanism allows fine-grained resource allocation precision to be achieved while keeping bit overhead low, since only virtual resource block indices need to be signaled rather than detailed physical resource descriptions.
3Reliability
If distributed virtual resource blocks are mapped to physical resource blocks using interleaving techniques, then frequency diversity order is improved, but mapping processing time increases
Solution Approach 1:
The patent establishes predetermined VRB-to-PRB mapping rules and interleaving patterns in advance, before actual resource allocation occurs. The mapping function, including any interleaving operations for distributed virtual resource blocks, is pre-configured based on system parameters such as frequency diversity requirements. When scheduling decisions are made, these pre-established mapping rules are simply applied rather than computed in real-time. This preliminary action approach ensures high frequency diversity order through proper interleaving while minimizing mapping processing time during actual scheduling operations.
Data Source
AI summary
A method for transmitting downlink data using resource blocks at a base station in a wireless mobile communication system includes transmitting downlink data mapped to physical resource blocks (PRBs) to a user equipment, wherein indexes of virtual resource blocks (VRBs) are mapped to indexes of the PRBs for a first slot and a second slot of a subframe, and the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap, and wherein a predetermined offset is applied to an index of a PRB when the index of the PRB is equal to or greater than a predetermined threshold.