Wireless Communication Apparatus Flexible Frequency Scheduling DFT Circuit Scale
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and LTE-Advanced uplinks, the allocation of resource blocks (RBs) is limited to multiples of specific patterns (2n×3m×5l), leading to inflexible resource allocation and increased circuit scale for DFT processing, especially when RBs cannot be expressed in these patterns.
Innovation Solution
A wireless communication apparatus and method that adjusts the number of allocated RBs to match the nearest or optimal pattern of 2n×3m×5l, selecting unused or added RBs to ensure flexible frequency scheduling without increasing the DFT circuit scale, by using correspondence tables and selecting RBs based on resource allocation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resource allocation is limited to multiples of 2n×3m×5l patterns, then the DFT circuit scale is reduced, but the frequency scheduling flexibility deteriorates
Solution Approach 1:
The system divides resource blocks into two categories: those that conform to the 2n×3m×5l pattern (allocated to terminals requiring DFT processing) and those that do not conform (allocated to terminals that can tolerate or handle non-pattern RBs). This segmentation allows the DFT circuit to process only the necessary portion while the overall system maintains flexible resource allocation.
Solution Approach 2:
Different quality requirements are applied to different parts of the resource allocation. Terminals that require strict DFT processing receive resource blocks that conform to the 2n×3m×5l pattern, while other terminals receive resource blocks without this restriction. This local differentiation resolves the contradiction by allowing flexibility where it doesn't compromise DFT processing quality.
2Productivity
If non-contiguous band allocation is supported, then the frequency scheduling effect is enhanced, but the resource allocation flexibility is reduced due to RBG-based allocation constraints
Solution Approach 1:
The resource allocation system segments resource blocks into RBG-based allocations (for frequency scheduling efficiency) and individual RB allocations (for flexibility). By allowing terminals to be allocated resource blocks both through RBG groups and as individual non-RBG blocks, the system maintains the frequency scheduling benefits of RBG-based allocation while recovering the flexibility loss through supplementary individual RB assignments.
Solution Approach 2:
The system applies RBG-based allocation partially (not exclusively), allowing some resource blocks to be allocated individually outside the RBG structure. This partial application of RBG-based allocation maintains the frequency scheduling effect while the excessive individual allocations restore the necessary flexibility for various transmission scenarios.
3Adaptability or versatility
If the number of RBs is increased beyond 2n×3m×5l patterns, then the resource allocation flexibility is improved, but the DFT circuit scale increases
Solution Approach 1:
The patent extracts the DFT processing requirement from the overall resource allocation system. By identifying that only specific resource blocks need to conform to the 2n×3m×5l pattern for DFT processing, the system can allocate additional resource blocks for flexibility without requiring the DFT circuit to scale proportionally. The DFT circuit processes only the extracted subset of pattern-conforming RBs.
Solution Approach 2:
The system changes the parameter constraints selectively: resource blocks allocated for DFT processing maintain the 2n×3m×5l pattern constraint, while resource blocks allocated for other purposes (where DFT is not required or alternative processing is used) can exceed this pattern. This parameter differentiation allows increased overall RB allocation without proportional DFT circuit scaling.
Data Source
AI summary
There are disclosed a wireless communication apparatus and a wireless communication method whereby a flexible frequency scheduling can be performed without increasing the circuit scale of DFT (Discrete Fourier Transform). In a terminal (200), a number-of-allocated-RBs setting unit (209) sets a number of allocated RBs, which is to be used for an actual transmission band corresponding to the number of notified RBs, to a number of resource blocks that can be expressed by one of “2n×3m×5l”. The allocated RB selecting unit (210) selects, based on the resource allocation information and the number of allocated RBs, either an unused one of the notified RBs that is not used as the transmission band or an additional RB that is added to the notified RBs and used as the transmission band.