Uplink Interference Mitigation via Dynamic Subchannel Allocation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently mitigating uplink interference, particularly due to the need for dynamic changes in data burst allocation regions based on cell loading status, which is hindered by the time required for updating set information in existing methods.
Innovation Solution
The method involves determining a loading-status value for each sector and generating UL zone switch IE and UL allocation start IE to dynamically allocate data bursts to different subchannels, using subchannel use type and permbase values, and adjusting these settings based on threshold values to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If set information (UL allocated subchannels bitmap or UL AMC allocated physical bands bitmap) is changed to dynamically allocate data bursts to different subchannels, then uplink interference mitigation is improved, but time delay increases because considerable time is needed until the changed set information is applied to each mobile station
Solution Approach 1:
The patent segments the interference mitigation approach by separating the dynamic subchannel allocation (done via UL-MAP) from the static set information (UCD). This allows frequent updates of allocation patterns without requiring updates to the underlying set information structure, thereby reducing time delay while maintaining interference mitigation effectiveness
Solution Approach 2:
The patent introduces dynamic subchannel allocation through UL-MAP messages that can be updated frequently based on current interference conditions and cell loading status. This dynamic mechanism operates independently of the static set information, enabling real-time adaptation without the time delay penalty of updating bitmap structures
2Productivity
If data bursts are allocated to all subchannels in each sector for uplink duration, then resource utilization is improved, but inter-sector interference increases
Solution Approach 1:
The patent applies local quality by allowing different sectors to use different subchannel allocation patterns based on their specific interference conditions and cell loading status. Each sector can optimize its subchannel usage locally while the base station coordinates to mitigate inter-sector interference through selective allocation
Solution Approach 2:
The patent enables dynamic adjustment of subchannel allocation per sector based on real-time interference measurements and cell loading status. The base station can switch between full subchannel utilization and selective subchannel allocation depending on interference conditions, optimizing both resource utilization and interference mitigation
Data Source
AI summary
Disclosed is a method and apparatus for mitigating uplink interference in the wireless communication system, wherein the method comprises determining a loading-status value for each sector; if the loading-status value is not greater than the first threshold value, generating UL zone switch IE and UL allocation start IE to allocate data bursts of the sectors to different subchannels; and preparing an uplink map using the UL zone switch IE and UL allocation start IE for each sector, wherein the uplink duration indicates a duration where all the subchannels are used for allocation of the data burst.