TXOP Sharing via Spatial Multiplexing for Wireless Channel Efficiency
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing channel access, particularly in high-load scenarios where distributed coordination function (DCF) mechanisms lead to increased collision probabilities and poor channel usage.
Innovation Solution
The method involves an access point configuring a carrier for communication with wireless devices, contending for access, and upon winning, reserving a transmission opportunity. This access point then cooperates with other access points by sharing the transmission opportunity through spatial multiplexing of wireless transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If distributed coordination function (DCF) is used for channel access, then simplicity of channel access mechanism is maintained, but channel usage efficiency deteriorates under high load conditions
Solution Approach 1:
The patent segments the transmission opportunity (TXOP) into multiple sub-intervals, allowing multiple access points to share the channel simultaneously through spatial multiplexing. This divides the single channel access into multiple parallel access paths, improving channel usage efficiency while maintaining distributed access simplicity.
Solution Approach 2:
The patent introduces spatial dimension to the traditional time-division channel access by enabling simultaneous transmissions from multiple access points through spatial multiplexing. This adds a spatial layer to the channel access mechanism, allowing parallel transmissions without increasing temporal contention.
2Productivity
If centralized channel access controlled by access point is implemented, then channel usage efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges distributed and centralized channel access approaches by allowing access points to autonomously coordinate TXOP sharing through spatial multiplexing. This hybrid approach maintains the simplicity of distributed access while incorporating centralized coordination benefits, avoiding the complexity of fully centralized control.
Solution Approach 2:
The patent enables access points to self-organize and autonomously coordinate their transmissions through spatial multiplexing without requiring external centralized control. Each access point independently participates in TXOP sharing based on spatial conditions, reducing overall system complexity while improving channel efficiency.
3Adaptability or versatility
If multiple access points contend for channel access independently, then autonomy of each access point is maintained, but collision probability increases
Solution Approach 1:
The patent implements feedback mechanisms where access points monitor spatial conditions and adjust their transmissions accordingly. This feedback allows autonomous access points to coordinate their transmissions dynamically, reducing collision probability while maintaining individual autonomy through adaptive spatial multiplexing.
4Productivity
If transmission opportunity is shared among multiple access points using spatial multiplexing, then throughput is enhanced, but system complexity increases
Solution Approach 1:
The patent implements dynamic TXOP sharing where access points can join or leave the spatial multiplexing group based on real-time spatial conditions and traffic demands. This dynamic approach allows the system to adapt to changing conditions, enhancing throughput while managing complexity through flexible, condition-based participation.
Data Source
AI summary
An access point (10) of a wireless communication system configures a carrier for communication with one or more wireless devices (11) associated with the access point (10). Further, the access point (10) contends for access to the carrier and, in response to winning contention for access to the carrier, reserves a transmission opportunity, TXOP, on the carrier. Further, the access point (10) cooperates with one or more other access points (10) of the wireless communication system by sharing the TXOP based on spatial multiplexing of wireless transmissions on the carrier.