Wireless Scheduling Grants for Interference Mitigation
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Solution Overview
Problem
In wireless communication systems, the reduction of guard bands between uplink and downlink channels due to carrier aggregation leads to increased interference, causing desensing issues that hinder the ability of receivers to decode signals effectively, particularly in scenarios where transmissions occur simultaneously and are geographically or frequency proximate.
Innovation Solution
The method involves adjusting the transmission bandwidth configurations by using indicators in scheduling grants to mute specific resource elements or adjust power levels in control channels, thereby creating an effective guard band to reduce interference between uplink and downlink channels, allowing for effective signal decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used to access additional frequency spectrum, then spectrum efficiency is improved, but interference between uplink and downlink channels increases causing receiver desensing
Solution Approach 1:
The patent segments the frequency spectrum by creating separate transmission bandwidth configurations for uplink and downlink channels with different frequency spans. This segmentation allows the system to utilize additional spectrum through carrier aggregation while maintaining isolated frequency regions that prevent interference-induced desensing between simultaneous uplink and downlink transmissions.
Solution Approach 2:
The patent applies local quality by assigning different transmission bandwidth configurations to different channels based on their specific interference conditions. Each channel (uplink or downlink) can have its own customized frequency span and resource allocation, allowing the system to optimize spectrum usage in each local frequency region while preventing harmful interference through targeted guard band implementation.
2Area of stationary object
If guard band between uplink and downlink channels is reduced to increase spectrum usage, then frequency spectrum utilization is improved, but receiver desensing occurs due to increased interference
Solution Approach 1:
The patent implements dynamic transmission bandwidth configurations that can be adjusted based on traffic conditions and interference levels. The system can dynamically select different frequency spans and resource allocations for uplink and downlink channels, allowing flexible spectrum utilization while maintaining sufficient separation to prevent desensing when needed. This dynamic adaptation enables the system to optimize between spectrum efficiency and decoding reliability in real-time.
3Productivity
If transmissions on uplink and downlink channels occur simultaneously in geographically proximate locations, then communication productivity is improved, but interference causes desensing of receivers
Solution Approach 1:
The patent resolves spatial-frequency interference by introducing an additional frequency dimension through asymmetric transmission bandwidth configurations. By allocating different frequency spans to uplink and downlink channels rather than using symmetric configurations, the system enables simultaneous transmissions in geographically proximate locations while maintaining frequency separation that prevents self-interference and desensing.
Data Source
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AI summary
In a method for scheduling resources, the method includes receiving a first control channel in a first subframe (426) as a part of wireless communication between a user equipment (102) and a network equipment (110) using a first type of radio access technology wherein the first control channel (408) includes a first scheduling grant for scheduling resources in a second subframe (424) using a second type of radio access technology. The method also includes receiving a second control channel in the first subframe using the first type of radio access technology wherein the second control channel includes a second scheduling grant for the scheduling resources in the first subframe using the first type of radio access technology.