Resource Allocation Based on Error Vector Magnitude in Wireless Systems
Solution Overview
Problem
In broadband wireless communication systems, the wide guard band required to support maximum modulation and coding schemes leads to inefficient resource allocation, especially when multiple frequency allocations are bundled or overlaid, resulting in decreased resource utilization efficiency.
Innovation Solution
The system divides resources into regions based on the maximum supportable Error Vector Magnitude (EVM) in the frequency axis, allowing for the allocation of resources in regions with lower EVM to services that do not require the maximum modulation and coding scheme, thereby reducing the guard band and enhancing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide guard band is used to support maximum MCS level in every resource region, then the required EVM is satisfied, but the number of available subcarriers decreases and resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies local quality by dividing the frequency spectrum into multiple regions with different EVM characteristics. Each region is assigned a specific maximum supportable MCS level based on its EVM performance. Services are then allocated to regions matching their required EVM, allowing high-EVM services to use regions with relaxed requirements while low-EVM services use regions with strict requirements. This resolves the contradiction by satisfying EVM requirements locally in each region without forcing all regions to use wide guard bands.
Solution Approach 2:
The patent changes the parameter of guard band width dynamically across different frequency regions rather than using a uniform wide guard band system-wide. By adjusting the effective guard band width according to each region's EVM characteristics and the services being deployed, the system achieves both EVM compliance and improved resource efficiency. Regions with better EVM performance use narrower guard bands, freeing up subcarriers for allocation.
2Reliability
If the guard band is widened to support maximum MCS level universally, then modulation and coding scheme requirements are met, but the number of available subcarriers decreases
Solution Approach 1:
The patent segments the frequency spectrum into multiple regions, each with its own maximum supportable MCS level determined by EVM characteristics. Instead of applying a universal guard band width across the entire spectrum, each segment is configured independently. This allows subcarriers in regions with relaxed EVM requirements to be made available for allocation, increasing the total number of usable subcarriers while still supporting maximum MCS levels where needed.
3Quantity of substance
If multiple frequency allocations are bundled or overlaid to meet broadband demands, then bandwidth capacity increases, but resource allocation efficiency decreases due to wide guard band
Solution Approach 1:
The patent merges multiple frequency allocation regions with different EVM characteristics into a unified resource pool. By combining regions that have different maximum supportable MCS levels and available subcarrier counts, the system creates a flexible resource pool that can be allocated based on service requirements. This merging approach maintains broadband capacity while improving efficiency by allowing services to be placed in regions where their EVM requirements are naturally satisfied with narrower guard bands.
Data Source
AI summary
A resource allocation in a broadband wireless communication system is provided. An apparatus for a base station in a broadband wireless communication system includes a manager for managing resources by dividing the resources into a plurality of regions based on a maximum supportable error vector magnitude (EVM) in a frequency axis; and an allocator for allocating resources of a region other than a first region, the region having the smallest maximum supportable EVM, to a service to which a maximum modulation and coding scheme (MCS) level is not applied.