Multi-Link LL TWT Scheduling for NSTR Low-Latency Transmission
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Solution Overview
Problem
Existing wireless communication technologies struggle to guarantee low-latency service transmission requirements in scenarios involving multiple links, particularly due to out-of-band interference and unsynchronized data transmission, which can lead to incomplete data transfer during overlapping service periods.
Innovation Solution
A multi-link Low Latency Target Wake Time (LL TWT) mechanism is introduced for Non-Simultaneous Transmit and Receive (NSTR) Multi-Link Devices (MLDs), incorporating a leader/follower transmission mode to synchronize data transmission across multiple links, ensuring that low-latency services are completed within designated periods by aligning PPDU ending times and using a Quiet element to manage channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple links of NSTR MLD carry low-latency services simultaneously, then service throughput is improved, but out-of-band interference occurs and delay requirements cannot be guaranteed
Solution Approach 1:
The patent segments the service period into multiple sub-intervals, with each sub-interval dedicated to a specific link's low-latency service transmission. This segmentation prevents overlapping transmissions on different links, eliminating out-of-band interference while maintaining high throughput by systematically utilizing all links.
Solution Approach 2:
The patent implements dynamic link selection and service period allocation based on real-time channel conditions and service requirements. The system dynamically adjusts which link transmits during each sub-interval, optimizing throughput while ensuring delay requirements are met through adaptive resource management.
2Device complexity
If data transmission is unsynchronized across multiple links, then device complexity is reduced, but data transfer completeness deteriorates during overlapping service periods
Solution Approach 1:
The patent implements periodic service periods with fixed durations and predetermined sub-interval allocations for each link. This periodic structure ensures that transmissions on different links are time-multiplexed rather than synchronized, reducing the complexity of inter-link coordination while guaranteeing complete data transfer by preventing overlaps.
Solution Approach 2:
The patent pre-allocates specific sub-intervals to specific links before transmission begins, based on predetermined rules or agreements. This preliminary assignment eliminates the need for real-time synchronization decisions during transmission, reducing device complexity while ensuring data completeness through advance planning.
Data Source
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AI summary
The embodiments of the present disclosure provide a wireless communication method and device. When there is an overlapping region between LL TWT SPs on a plurality of links of an NSTR Non-AP MLD, leader/follower transmission modes on the multiple links are set, so as to solve the problem that a low-latency service on a certain link cannot be transmitted in an LL TWT SP as the NSTR Non-AP MLD cannot receive and transmit at the same time. Therefore, the transmission delay requirement of the low-latency service on the plurality of links of NSTR Non-AP MLD can be guaranteed, and the transmission on the plurality of links of the NSTR Non-AP MLD can be optimized.