Channel Switch Announcement Timing for Synchronized Wireless Handover
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Solution Overview
Problem
Existing channel switch methods in wireless communication networks, particularly in extended personal area networks (XPANs), face challenges such as immediate switching causing synchronization issues and significant delays due to beacon intervals, leading to interruptions and failure to meet latency and quality-of-service requirements.
Innovation Solution
Implementing a channel switch announcement that indicates a time for the channel switch to occur, which is less than a beacon interval, allowing for coordinated and timely channel transitions within the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If immediate channel switching is performed, then response time is reduced, but synchronization issues and network interruptions occur
Solution Approach 1:
The access point transmits a channel switch announcement frame before actually switching channels, notifying stations of the upcoming switch time. This preliminary notification allows stations to prepare for the switch without immediate execution, preventing synchronization issues while maintaining timely channel transitions.
Solution Approach 2:
The patent introduces dynamic timing parameters including a delay period between announcement and actual switch, and an offset from beacon transmission time. These dynamic adjustments allow the system to balance between quick channel switching and maintaining synchronization, adapting to different network conditions.
2Reliability
If channel switch is delayed to next beacon interval, then network synchronization is maintained, but significant latency and service interruptions occur
Solution Approach 1:
The channel switch announcement is transmitted in advance during the current beacon interval, specifying a switch time that occurs before the next beacon interval ends. This allows the switch to be prepared early without being constrained to wait until the next beacon boundary, reducing latency while maintaining synchronization.
Solution Approach 2:
The patent changes the timing parameter from fixed beacon interval boundaries to flexible timestamps within the beacon interval. By using a delay period and offset calculations, the switch time can be precisely controlled to occur at an optimal moment before the beacon interval ends, reducing waiting time while preserving network synchronization.
3Reliability
If channel switch announcement is transmitted early, then stations have time to prepare, but the announcement may be missed and require retransmission
Solution Approach 1:
The patent implements an acknowledgment mechanism where stations confirm receipt of the channel switch announcement. The access point monitors for acknowledgments and determines whether retransmission is necessary based on feedback from stations, ensuring reliable delivery without unnecessary retransmissions.
Solution Approach 2:
The announcement includes sufficient timing information (delay period, offset, timestamp) that provides stations with adequate preparation time. This excessive timing information ensures stations can reliably prepare for the switch without requiring multiple announcement transmissions, reducing the need for retransmission while maintaining coordination reliability.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may transmit a channel switch announcement indicating a time by which a channel switch is to occur, wherein the time for the channel switch is less than a beacon interval from the time by which the channel switch announcement is transmitted. The wireless communication device may perform the channel switch in accordance with the channel switch announcement. Numerous other aspects are described.