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Inter-access point scheduling and resource management system for dense deployments

專利號
US11159960B1
公開日期
2021-10-26
申請人
Cisco Technology, Inc.(US CA San Jose)
發(fā)明人
Robert E. Barton; Vishal Satyendra Desai; Indermeet Singh Gandhi; Jerome Henry
IPC分類
H04W24/02; H04W72/08; H04W56/00; H04B17/318; H04W84/18
技術(shù)領(lǐng)域
ap,aps,master,slave,schedule,or,ofdma,104g,stas,may
地域: CA CA San Jose

摘要

Systems and methods herein can synchronize 802.11ax Uplink (UL) and Downlink (DL) Orthogonal Frequency-Division Multiple Access (OFDMA) schedules between adjacent APs that have overlapping BSSs, which may not be solved by BSS coloring. The method includes several stages. First, the APs detect RF interference from APs with overlapping BSSs. Then, the APs conduct time synchronization between these APs. The various APs can then elect a master scheduler. The master scheduler creates and implements a master schedule between these APs to coordinate use of the radio resource.

說明書

TECHNICAL FIELD

An exemplary aspect is directed toward communications systems. More specifically an exemplary aspect is directed toward IEEE (Institute of Electrical and Electronics Engineers) 802.11 wireless communications systems.

BACKGROUND

Wireless systems employ processes to manage the radio resources of the wireless devices to optimize parameters including channelization, transmit power, etc. The management of the radio helps avoid or mitigate issues with signal interference. The processes to manage the radio resource can be executed on a controller that may manage the Access Points (APs) that are either joined to the same controller or joined to another controller belonging to the same Radio Frequency (RF) group. Thus, any APs not part of the same deployment or controlled together may not be optimized to work together.

Overlapping BSSs is a known and common challenge in Wi-Fi networks. This situation can occur frequently in the 2.4 GHz band and the wider 5 GHz channels, where 80 MHz and 160 MHz-wide channels can be found. BSS coloring or identification was introduced in 802.11ax to help mitigate problems with overlapping BSSs, however, this change only attempts to keep Stations (STAs) of different colors from contending for access to the same medium. Yet, APs in overlapping BSSs are still a source of Radio Frequency (RF) interference and thus cause collisions. Therefore, even with BSS coloring, co-channel RF interference issues still exist, making it difficult to deploy many APs in the 2.4 GHz spectrum or when using wider channels of the 5 GHz spectrum.

These above scenarios present challenges in radio resource optimization.

SUMMARY

權(quán)利要求

1
What is claimed is:1. A method comprising:receiving, at a first Access Point (AP) of a first Basic Service Set (BSS), a signal from a second AP of a second BSS;determining, by the first AP, a Received Signal Strength Indicator (RSSI) associated with the second AP to determine if there is interference from the second AP; andwhen there is interference, generating a joint schedule for the first AP and the second AP to manage how the first AP and second AP transmit or receive signals to mitigate the interference, wherein the first AP and the second AP exchange an agreement comprising a handshake signal to conduct joint scheduling, wherein the first AP and the second AP elect the first AP as a master AP to generate the joint schedule, wherein the second AP is a slave AP, wherein the first AP and the second AP synchronize timing using a Precision Time Protocol before following the joint schedule, wherein the first AP receives data associated with the second AP to generate the joint schedule, wherein the data associated with the second AP comprises one or more of an amount of activity at the second AP, a current resource unit (RU) assigned to the second AP, and/or an orthogonal frequency-division multiple access (OFDMA) schedule being followed by the second AP.2. The method of claim 1, wherein the joint schedule provides an RU in which the second AP is to transmit or receive data.3. A access point (AP) comprising:a radio operable to receive a signal from a second AP of a second Basic Service Set (BSS);a memory;a processor in communication with the memory and the radio, the processor operable to:determine a Received Signal Strength Indicator (RSSI) associated with the second AP to determine if there is interference from the second AP;when there is interference:send a handshake signal to the second AP as an agreement to conduct joint scheduling; andgenerate a joint schedule for the AP and the second AP to manage how the AP and second AP transmit or receive signals to mitigate the interference, wherein the AP receives data associated with the second AP to generate the joint schedule, and wherein the data associated with the second AP comprises one or more of an amount of activity at the second AP, a current resource unit (RU) assigned to the second AP, and/or an orthogonal frequency-division multiple access (OFDMA) schedule being followed by the second AP.4. The AP of claim 3, wherein the AP and the second AP elect the AP as a master AP to generate the joint schedule, and wherein the second AP is a slave AP.5. The AP of claim 3, wherein the AP and the second AP synchronize timing before following the joint schedule, and wherein the timing is synchronized using a Precision Time Protocol.6. The AP of claim 3, wherein the joint schedule provides an RU in which the second AP is to transmit or receive data.7. A basic service set comprising:a first access point operable to:receive a signal from a second AP of a second Basic Service Set (BSS);determine a Received Signal Strength Indicator (RSSI) associated with the second AP to determine if there is interference from the second AP;when there is interference:send a handshake signal to the second AP as an agreement to conduct joint scheduling; andgenerate a joint schedule for the AP and the second AP to manage how the AP and second AP transmit or receive signals to mitigate the interference, wherein the joint schedule provides an RU in which the second AP is to transmit or receive data.8. The basic service set of claim 7, wherein the AP and the second AP elect the AP as a master AP to generate the joint schedule, and wherein the second AP is a slave AP.9. The basic service set of claim 8, wherein the AP and the second AP synchronize timing before following the joint schedule, and wherein the timing is synchronized using a Precision Time Protocol.10. The basic service set of claim 9, wherein the AP receives data associated with the second AP to generate the joint schedule, and wherein the data associated with the second AP comprises one or more of an amount of activity at the second AP, a current resource unit (RU) assigned to the second AP, and/or an orthogonal frequency-division multiple access (OFDMA) schedule being followed by the second AP.
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