Dynamic Spectrum Allocation in Wireless Guard Bands
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Solution Overview
Problem
In wireless communication systems, the spectrum in guard bands is underutilized due to reserved frequency bands that prevent transmissions to avoid interference between adjacent base stations, reducing the overall spectrum usage and efficiency.
Innovation Solution
A method and apparatus that dynamically reallocate spectrum in guard bands by determining the location of user equipment within overlapping coverage areas, allowing transmissions in guard bands without causing interference by assigning frequencies adjacent to band edges based on the equipment's location relative to overlapping coverage areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard bands are reserved to prevent interference between adjacent base stations, then interference mitigation is improved, but spectrum utilization deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from static guard band allocation to dynamic spectrum assignment. The system continuously monitors UE locations and dynamically adjusts which UEs can access guard band frequencies, allowing the guard bands to be statically reserved for interference protection while dynamically utilized when safe. This resolves the contradiction by making the spectrum allocation adaptive rather than fixed.
Solution Approach 2:
The patent changes the parameter of spectrum accessibility by location. Instead of uniformly prohibiting all transmissions in guard bands, the system changes the accessibility parameter based on UE location relative to overlapping coverage areas. UEs outside overlapping areas are permitted to use guard band frequencies, while those inside are restricted, thereby utilizing spectrum without causing interference.
2Reliability
If guard bands are enlarged to compensate for worst case operating conditions, then reliability is improved, but spectrum efficiency deteriorates
Solution Approach 1:
The patent applies local quality by differentiating spectrum access permissions based on local UE conditions. Instead of uniformly enlarging guard bands across all locations, the system evaluates each UE's specific location and grants guard band access only to UEs in locations where it will not cause interference. This localized approach maintains reliability for protected UEs while improving spectrum efficiency overall.
Solution Approach 2:
The patent implements partial action by allowing only certain UEs (those outside overlapping coverage) to access guard band frequencies, rather than universally permitting or prohibiting access. This partial utilization of guard bands for eligible UEs improves spectrum efficiency without compromising the reliability protection for UEs that require guard band separation.
3Reliability
If no transmissions are allowed within guard bands, then interference between adjacent base stations is prevented, but spectrum capacity is reduced
Solution Approach 1:
The patent introduces location information as an intermediary that mediates between interference prevention and spectrum utilization. The system uses UE location data as a deciding factor to determine whether a specific UE can access guard band frequencies. This intermediary mechanism enables selective transmission permissions that prevent interference while capturing available spectrum capacity.
Solution Approach 2:
The patent applies universality by making guard band frequencies serve multiple functions: they continue to provide interference protection for UEs in overlapping coverage areas while simultaneously serving as additional spectrum resources for UEs outside overlapping areas. This multi-functionality resolves the contradiction by allowing the same frequencies to fulfill both protection and capacity roles under different conditions.
Data Source
AI summary
A method and apparatus for allocating spectrum within a wireless communication system is provided herein. During operation, a first base station will determine a location of a UE wishing to transmit. A database will be accessed containing wireless coverage area information for base stations with overlapping coverage with the first base station. Based on this information the first base station will determine if the UE is within an overlapping coverage area of multiple base stations. Spectrum will be assigned to the wireless equipment in a guard band, based at least in part on the determination that the UE is not within the overlapping coverage area.