Coordinated Service Period Setup for Overlapping BSS Interference
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Solution Overview
Problem
In wireless communication systems, overlapping Basic Service Sets (BSSs) operating on the same frequency resources in close proximity experience interference due to uncoordinated access point (AP) communications, leading to unpredictable service quality and increased latency, which existing IEEE 802.11 specifications do not adequately address.
Innovation Solution
A method and apparatus for setting up a coordinated service period (SP) between access points (APs) in a multiple AP environment, where APs negotiate and agree on service parameters to establish a shared communication period, reducing interference and ensuring predictable transmit and receive behaviors through the exchange of request and response frames and announcement frames within their respective BSSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple BSSs operate independently on the same frequency resources in close proximity, then each BSS can operate autonomously without central coordination, but overlapping BSS interference occurs and service quality becomes unpredictable
Solution Approach 1:
The patent introduces a coordinator AP as an intermediary entity that mediates between multiple BSSs. The coordinator collects information from member APs, determines coordinated service periods, and transmits control frames to manage interference. This intermediary structure enables autonomous BSS operation while introducing coordination mechanisms to improve service quality predictability through controlled resource sharing and interference mitigation.
2Ease of operation
If APs communicate using traditional Ad Hoc mode without coordination, then channel access is simple and decentralized, but OBSS interference cannot be mitigated and QoS cannot be guaranteed
Solution Approach 1:
The patent segments the service period into distinct time slots allocated to different BSSs. The coordinated service period is divided into multiple sub-periods, each assigned to a specific member AP. This time-based segmentation allows simple decentralized channel access within each slot while effectively mitigating OBSS interference through temporal separation of transmissions.
Solution Approach 2:
The coordinator AP performs preliminary actions by collecting information from member APs before the coordinated service period begins. The coordinator determines the service period parameters and transmits control frames in advance to prepare the network for coordinated operation. This preliminary coordination enables simple channel access during execution while preventing OBSS interference through pre-established time slot assignments.
3Productivity
If APs share frequency resources without coordination, then resource utilization appears high, but interference increases and latency increases
Solution Approach 1:
The patent implements periodic coordinated service periods where member APs transmit data in predetermined time slots. This periodic action pattern allows efficient resource utilization by ensuring every AP gets dedicated transmission opportunities while maintaining low latency through structured time division. The periodic coordination prevents random interference and ensures predictable service quality.
Data Source
AI summary
A wireless communication method employed by an access point (AP) includes: negotiating with another AP for setting up a coordinated service period (SP), and sending a first announcement frame inside a first basic service set (BSS) to inform that the coordinated SP has been created. The step of negotiating with the another AP for setting up the coordinated SP includes: receiving a request frame from the another AP, wherein the request frame includes a plurality of SP parameters; and sending a response frame to the another AP. The AP belongs to the first BSS, and the another AP belongs to a second BSS different from the first BSS.