Wireless Frame Duration Indication for Multi-Link Transmission Alignment
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Solution Overview
Problem
Wireless communication systems face inefficiencies due to non-simultaneous transmission and reception capabilities in devices, leading to challenges in aligning transmission end times across multiple links, particularly in devices that do not support concurrent transmission and reception.
Innovation Solution
A method involving the transmission of a Physical Layer Protocol Data Unit (PPDU) with a frame that indicates the duration of a subsequent PPDU, using a non-Trigger-Based format, to enable alignment of transmission end times and improve communication efficiency in non-simultaneous transmission and reception devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a wireless device does not support simultaneous transmission and reception (NSTR), then the device complexity is reduced, but the productivity of wireless communication is degraded due to inability to align transmission end times on multiple links
Solution Approach 1:
The patent applies preliminary action by including duration indication information in the first frame transmitted on the first link, which specifies the duration of the second PPDU that will be transmitted on the second link. This allows the receiving device to know in advance the timing characteristics of subsequent transmissions, enabling proper alignment and reception scheduling without requiring complex simultaneous transmission/reception capabilities.
2Productivity
If simultaneous transmission and reception is enabled on multiple links, then the productivity of wireless communication is improved, but the device complexity increases due to requirements for precise timing alignment and coordination
Solution Approach 1:
The patent uses the first frame as an intermediary carrier that conveys duration indication information about the second PPDU. This intermediary mechanism allows the system to coordinate multi-link transmissions without requiring complex direct synchronization between transmission and reception operations, thereby improving productivity while managing device complexity through information-based coordination rather than hardware-based simultaneous operation.
3Loss of time
If duration indication information is included in the first frame, then the loss of time for coordination is reduced, but the length of the first frame increases
Solution Approach 1:
The patent implements partial action by including only the essential duration indication information in the first frame, rather than providing complete scheduling details for all parameters. This partial information approach is sufficient to enable the receiving device to align its reception timing and process subsequent PPDUs efficiently, reducing coordination time while minimizing the increase in frame length by providing only the critical timing parameter.
Data Source
AI summary
Embodiments of a method and an apparatus for wireless communications are disclosed. In an embodiment, a method for wireless communications involves, at a first station (STA), transmitting a first Physical Layer Protocol Data Unit (PPDU) that includes a first frame to a second STA, wherein the first frame indicates a first duration of a second PPDU that is transmitted subsequent to the first PPDU by a single STA, wherein a non-Trigger-Based (non-TB) PPDU format is used for the second PPDU, and wherein the first frame solicits a response frame included as part of the second PPDU, and at the first STA, receiving from the second STA, the second PPDU that includes the response frame.