STR Multi-Link AP Scheduling Under Self-Interference Constraints
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Solution Overview
Problem
Constrained STR AP MLDs face challenges in efficient scheduling and parameter selection due to in-device interference, limiting the effective utilization of multi-link operations, especially in unlicensed spectrum scenarios.
Innovation Solution
The AP MLD is configured to set up links in multi-link operation with non-AP STAs that are not affiliated with the same MLD, employing intelligent scheduling and parameter selection based on path loss, self-interference, and communication parameters to minimize disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constrained STR AP MLD performs simultaneous transmit and receive on multiple links, then spectrum utilization is improved, but in-device interference increases
Solution Approach 1:
The system segments the multi-link operation by identifying STR-constrained link pairs and applying specialized scheduling only to those pairs, while other links can operate independently. This segmentation allows simultaneous TX/RX on segmented link pairs without full-system interference management overhead.
Solution Approach 2:
The scheduling algorithm dynamically determines whether to schedule simultaneous DL/UL on a link pair based on real-time assessment of STR capability and interference conditions. The system can adaptively switch between simultaneous and non-simultaneous scheduling modes for different link pairs depending on current traffic and interference conditions.
2Productivity
If joint DL/UL scheduling is implemented for STR-constrained links, then transmission efficiency is improved, but scheduling complexity increases
Solution Approach 1:
The scheduling problem is segmented by identifying and separately handling STR-constrained link pairs. The AP MLD determines which link pairs are STR-constrained and applies joint scheduling only to those specific pairs, while other links use independent scheduling, thus reducing overall complexity.
Solution Approach 2:
The system applies joint scheduling selectively to only those link pairs that are STR-constrained, rather than applying it system-wide. This partial application of the complex scheduling algorithm reduces computational overhead while still achieving the benefits of joint scheduling where needed.
3Productivity
If concurrent DL and UL transmissions are scheduled on STR-constrained links, then resource utilization is improved, but interference management difficulty increases
Solution Approach 1:
The system performs preliminary assessment of STR capability for each link pair before scheduling. The AP MLD determines whether a link pair is STR-constrained in advance, allowing it to pre-configure appropriate scheduling strategies and interference management mechanisms before actual transmissions occur.
Solution Approach 2:
The patent introduces an intermediate classification layer that categorizes link pairs as STR-constrained or non-STR-constrained based on capability assessment. This intermediate classification acts as a mediator that simplifies the interference management task by grouping links with similar interference characteristics together.
Data Source
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AI summary
Apparatuses and methods are disclosed for joint downlink/uplink (DL/UL) scheduling and parameter selection for constrained simultaneous transmit and receive (STR) access point (AP) multi-link devices (MLDs). In one embodiment, a STR capable MLD includes an AP STA. The MLD is configured to jointly schedule an uplink communication on a first link and a simultaneous downlink communication on a second link by selecting a first non-access point (non-AP) station (STA) for the uplink communication and a second non-AP STA for the simultaneous downlink communication out of a plurality of non-AP STAs, the first and second links being a STR constrained pair of links, the first link being associated with the first non-AP STA, the second link being associated with the second non-AP STA, and the first and second non-AP STAs not being affiliated with a same MLD.