WLAN Service-Period Reallocation Across Multiple Access Points
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Solution Overview
Problem
Existing wireless LAN systems lack effective methods for scheduling service periods (SPs) and reallocating remaining time periods among multiple access points (APs) to optimize communication efficiency and support advanced features like low latency and ultra-high reliability.
Innovation Solution
A method and device that enable one AP to schedule and reallocate a service period (SP) of another AP in a WLAN system, involving information exchange and frame exchange during a time period within the SP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If one AP schedules service periods of multiple APs in a multi-AP operation, then scheduling efficiency and resource utilization are improved, but system complexity and coordination overhead increase
Solution Approach 1:
A designated master AP acts as an intermediary to schedule service periods for multiple APs in the multi-AP group. This master AP receives scheduling requests, determines service period allocations, and communicates the schedules to other APs, thereby centralizing control and reducing overall system complexity while improving scheduling efficiency
Solution Approach 2:
The patent introduces specific scheduling parameters including service period start times, durations, and time offset values that allow flexible allocation of transmission opportunities. By adjusting these parameters, the system can optimize resource utilization without requiring complex real-time negotiations between APs
2Productivity
If remaining time periods within service periods are reallocated among APs, then resource utilization and transmission efficiency are improved, but scheduling coordination complexity increases
Solution Approach 1:
The patent enables dynamic reallocation of remaining time periods within service periods. APs can request additional transmission opportunities by sending reallocation requests to the master AP, which then dynamically adjusts the schedule by modifying service period parameters and time offsets to accommodate new requests while maintaining overall schedule coherence
Solution Approach 2:
The master AP pre-calculates and determines service period allocations and time offsets in advance based on received requests. By performing scheduling decisions beforehand rather than in real-time during transmissions, the system reduces coordination complexity while enabling flexible resource reallocation
3Speed
If service periods are allocated to support low latency traffic, then transmission speed and responsiveness are improved, but time allocation flexibility for other traffic types is reduced
Solution Approach 1:
The patent divides the wireless medium into distinct service periods with different time offsets, allowing simultaneous allocation of resources for different traffic types. Low latency traffic can be assigned to service periods with shorter time offsets for faster transmission, while other traffic types use different time slots, maintaining overall system flexibility
Solution Approach 2:
Different service periods are configured with different characteristics tailored to specific traffic requirements. By assigning appropriate time offsets and durations to each service period based on its intended traffic type, the system optimizes transmission speed for low latency traffic while preserving allocation flexibility for other traffic through differentiated scheduling parameters
Data Source
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AI summary
Disclosed are a method and device for remaining time period scheduling based on a multiple access point (AP) operation in a wireless LAN system. A method performed by a first first-type station (STA) in a wireless LAN system according to an embodiment disclosed herein may comprise the steps of: receiving information related to a first service period (SP) from a second first-type STA or a second-type STA; transmitting a reallocation request for the first SP to the second first-type STA or the second-type STA; and exchanging frames with at least one third-type STA associated with the first first-type STA during the time period in the first SP. The first SP may be included in a second SP allocated to the second first-type STA by the second-type STA.