TXOP Sharing for Random Access Uplink Power Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently utilizing coordinated spatial reuse for unscheduled uplink transmissions, such as UL OFDMA random access, due to the inability of shared APs to control the transmit power of non-scheduled random access transmissions.
Innovation Solution
A method where wireless stations and APs cooperate to share a TXOP based on coordinated spatial reuse, with the station determining path loss and receiving interference levels to autonomously control transmit power for random access transmissions, ensuring the allowed interference is not exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If distributed channel access (DCF) is used in unlicensed bands, then devices can access the channel independently when data is available, but channel collision probability increases significantly under high load conditions
Solution Approach 1:
The patent introduces an AP as an intermediary that coordinates channel access between multiple STAs. The AP receives buffer status reports from STAs, determines uplink resource allocations, and sends resource allocation messages back to STAs. This centralized coordination mechanism eliminates the need for STAs to independently contend for the channel, thereby resolving the collision problem while maintaining ease of operation through automated AP-mediated resource distribution.
2Productivity
If centralized channel access (AP-controlled) is implemented to reduce collisions, then channel usage efficiency improves, but the system complexity increases due to additional coordination overhead
Solution Approach 1:
The patent implements a self-service mechanism where STAs autonomously determine their transmit power based on path loss calculations and received power measurements. Instead of requiring the AP to explicitly allocate power resources to each STA, the STAs independently adjust their transmit power levels based on buffer status and channel conditions. This reduces the coordination complexity between AP and STAs while maintaining high channel usage efficiency through distributed power control decisions.
3Productivity
If multiple APs share TXOP resources through coordinated spatial reuse, then spatial efficiency improves, but interference management becomes more challenging due to unscheduled uplink transmissions
Solution Approach 1:
The patent implements a feedback mechanism where STAs send buffer status reports to the AP, and the AP responds with resource allocation messages that include power control parameters. This closed-loop feedback system enables the AP to monitor uplink transmission conditions and adjust resource allocations dynamically. The feedback mechanism provides the necessary information for interference management in coordinated spatial reuse scenarios, allowing the system to maintain spatial efficiency while managing interference through informed resource allocation decisions.
Data Source
AI summary
A wireless station (11) determines a path loss of a wireless signal path between the wireless station (11) and a first access point (10). The first access point (10) cooperates with a second access point (10) by sharing a transmit opportunity based on coordinated spatial reuse of at least one resource of the shared transmit opportunity. Further, the wireless station (11) receives, from the second access point (10), an indication of a level of allowed interference on the at least one resource of the shared transmit opportunity. Based on the determined path loss and the indication of the level of allowed interference, the wireless station (11) controls a transmit power of at least one wireless random access transmission performed on the at least one resource of the shared transmit opportunity from the wireless station (11) to the second access point (10).