WO2023206526A1 - Wlan通信方法、接入点、客户端、计算设备和存储介质 - Google Patents

Wlan通信方法、接入点、客户端、计算设备和存储介质 Download PDF

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Publication number
WO2023206526A1
WO2023206526A1 PCT/CN2022/090646 CN2022090646W WO2023206526A1 WO 2023206526 A1 WO2023206526 A1 WO 2023206526A1 CN 2022090646 W CN2022090646 W CN 2022090646W WO 2023206526 A1 WO2023206526 A1 WO 2023206526A1
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Prior art keywords
client
access point
clients
polling
response time
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PCT/CN2022/090646
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English (en)
French (fr)
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王力
蓝培
张洁
马万里
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西门子股份公司
西门子(中国)有限公司
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Priority to PCT/CN2022/090646 priority Critical patent/WO2023206526A1/zh
Publication of WO2023206526A1 publication Critical patent/WO2023206526A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/10Scheduling measurement reports ; Arrangements for measurement reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/12Wireless traffic scheduling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices

Definitions

  • the present disclosure relates generally to the field of wireless communication technologies, and more specifically, to WLAN communication methods, access points, clients, computing devices, and storage media.
  • WLAN 802.11a/b/g/n/ac/ax
  • Consumer product communications focus on fast, high throughput, while industrial communications have higher requirements for low latency and low jitter.
  • Industrial communication protocols such as PROFINET
  • Due to WLAN's native CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism WLAN devices cannot transmit data until they successfully compete for channel access. The presence of a large number of WLAN devices on the same channel will increase channel access contention time and mean a huge difference in channel access latency. This random access means that WLAN technology cannot provide deterministic communication.
  • the consumer product market is much larger than the industrial market, so the new generation of WLAN standards, chipsets and products have greater motivation to improve throughput, but there is not much research on reducing jitter.
  • the challenge is how to leverage and extend mainstream WLAN capabilities to meet industrial latency/jitter requirements without requiring custom hardware at the chip level.
  • the present disclosure proposes a WLAN communication method using a broadcast/multicast IPCF mechanism.
  • the access point can send a polling request message to multiple clients at the same time, saving a lot of channel access time and supporting more more clients and further reduce communication jitter.
  • a WLAN communication method including:
  • the access point simultaneously sends a polling request message to one or more of its associated clients
  • the access point receives polling response messages sent by the one or more clients in sequence;
  • the access point sends an ACK confirmation message to the corresponding client after receiving each polling response message
  • the above operations are repeated starting from the access point sending a polling request message to the client.
  • the polling request message includes respective mac addresses of the one or more clients.
  • the polling request message further includes: data to be sent by the access point to the one or more clients.
  • a WLAN communication method including:
  • the client receives the polling request message from the access point
  • the client sends a polling response message to the access point within its response time window, where,
  • the start time of the response time window is the moment when the polling request message is received, and ends The time is the scheduled latest response time of the first client,
  • the start time of the response time window is the moment when the client observes the ACK confirmation message of the N-1th client or reaches the predetermined latest response time of the N-1th client.
  • the end time is the scheduled latest response time to reach the Nth client, where N>1 and N ⁇ M, M is the total number of clients to be polled by the access point;
  • the client receives an ACK confirmation message from the access point.
  • the polling request message includes the mac addresses of all clients, and the client determines according to the mac addresses to send the polling response to all clients.
  • the order of the messages and determines the client's scheduled latest response time based on that order.
  • a WLAN communication method including:
  • the access point simultaneously sends a polling request message to one or more of its associated clients
  • the client sends polling response messages to the access point in sequence within its response time window, where,
  • the start time of the response time window is the moment when the polling request message is received, and ends The time is the scheduled latest response time of the first client,
  • the start time of the response time window is the moment when the ACK confirmation message of the N-1th client is observed or the scheduled latest response time of the N-1th client is reached, and the end time is the scheduled latest response time to reach the Nth client, where N>1 and N ⁇ M, M is the total number of clients to be polled by the access point;
  • the access point sends an ACK confirmation message to the client after receiving the polling response message from the client;
  • the above operations are repeated starting from the access point sending a polling request message to the client.
  • a wireless access point including:
  • a polling request sending unit configured to simultaneously send a polling request message to one or more clients among its associated clients
  • a polling response receiving unit configured to receive polling response messages sent by the one or more clients in sequence
  • An ACK sending unit configured to send an ACK confirmation message to the corresponding client after receiving each polling response message
  • the repetition control unit is configured to control the polling request sending unit to send the next polling request message after receiving polling response messages from all clients or after reaching the predetermined latest response time of the last client.
  • a client including:
  • a polling request receiving unit configured to receive a polling request message from the access point
  • a polling response sending unit configured to send a polling response message to the access point within the response time window of the client, wherein,
  • the start time of the response time window is the moment when the polling request message is received, and ends The time is the scheduled latest response time of the first client,
  • the start time of the response time window is the moment when the ACK confirmation message of the N-1th client is observed or the scheduled latest response time of the N-1th client is reached, and the end time is the scheduled latest response time to reach the Nth client, where N>1 and N ⁇ M, M is the total number of clients to be polled by the access point;
  • an ACK receiving unit configured to receive an ACK confirmation message from the access point.
  • a computing device including: at least one processor; and a memory coupled to the at least one processor, the memory being configured to store instructions that when the instructions are processed by the at least one When the processor executes, the processor is caused to execute the method as described above.
  • a non-transitory machine-readable storage medium storing executable instructions that, when executed, cause the machine to perform the method as described above.
  • a computer program comprising computer-executable instructions which, when executed, cause at least one processor to perform the method as described above.
  • a computer program product tangibly stored on a computer-readable medium and including computer-executable instructions that, when executed, cause at least A processor executes the method described above.
  • the WLAN communication method according to the present disclosure and the access point and client communicating using the communication method have at least one or more of the following advantages.
  • Figure 1 is a schematic flow chart of wireless communication using the basic IPCF scheduling mechanism between the access point and the client.
  • FIG. 2A is a flowchart of an exemplary process of a broadcast/multicast IPCF-based WLAN communication method according to an embodiment of the present disclosure.
  • FIG. 2B is a schematic flow chart of interactive communication between an access point and a client using the WLAN communication method according to the present disclosure.
  • FIG. 3 is a flowchart of an exemplary process of a WLAN communication method performed at an access point according to an embodiment of the present disclosure.
  • FIG. 4 is a flowchart of an exemplary process of a WLAN communication method performed at a client according to an embodiment of the present disclosure.
  • FIG. 5 shows a block diagram of an exemplary configuration of an access point for performing the WLAN communication method shown in FIG. 3 .
  • FIG. 6 shows a block diagram of an exemplary configuration of a client for performing the WLAN communication method shown in FIG. 4 .
  • FIG. 7 shows a block diagram of a computing device for implementing a WLAN communication method according to an embodiment of the present disclosure.
  • the reference signs are as follows:
  • 200, 300, 400 WLAN communication method S202, S204, S206, S208, S302, S304, S306, S308, S402, S404, S406: Steps
  • Access point 502 Polling request sending unit
  • 602 Polling request receiving unit 604: Polling response sending unit
  • ACK receiving unit 700 Computing device
  • the term "includes” and variations thereof represent an open term meaning “including, but not limited to.”
  • the term “based on” means “based at least in part on.”
  • the terms “one embodiment” and “an embodiment” mean “at least one embodiment.”
  • the term “another embodiment” means “at least one other embodiment”.
  • the terms “first”, “second”, etc. may refer to different or the same object. Other definitions may be included below, whether explicit or implicit. The definition of a term is consistent throughout this specification unless the context clearly dictates otherwise.
  • the 802.11 standard specifies an operating mode called PCF (Point Coordination Function), in which channel access is arranged by the Access Point (AP) in a deterministic manner.
  • PCF Point Coordination Function
  • AP Access Point
  • this mode is not widely accepted and is therefore not supported by any relevant WLAN chipsets.
  • the contention-based DCF model distributed Coordination Function
  • its evolved variants are widely used.
  • IPCF Intelligent Point Coordination Function
  • Figure 1 shows a schematic flow chart of wireless communication using a basic IPCF scheduling mechanism between an access point and a client.
  • the WLAN client does not actively send data packets, but only sends them when polled by the WLAN access point.
  • the access point 12 sends a polling request message 1001 to the first client 14, which may include downlink data (if any), and waits for the client's polling with a predetermined maximum waiting time.
  • Response message which may include uplink payload data (if any).
  • the first client 14 After receiving the polling request message, the first client 14 first sends an ACK confirmation message 1002 to the access point 12, and then sends a polling response message (uplink data message) 1003 to the access point 12.
  • the access point 12 After the access point 12 receives the polling response message of the first client 14, the access point 12 sends an ACK confirmation message 1004 to the first client 14.
  • the access point 12 After the access point 12 receives the polling response message from the first client 14, or if the access point 12 does not receive the polling response message from the first client within the maximum waiting time, the access point 12 will next The client sends a polling request message.
  • the access point 12 repeats the polling request/polling response process one by one for other associated clients (the second client 16 and the third client 18 in FIG. 1 ).
  • the unicast polling request is modified into a broadcast/multicast polling request. All relevant clients can receive broadcast/multicast polling request messages from the AP at the same time, and then send polling response messages to the AP one by one.
  • This scheduling scheme is referred to as broadcast/multicast IPCF in this disclosure.
  • AP and access point both refer to wireless access points in the WLAN network.
  • AP and access point can be used interchangeably.
  • FIG. 2A is a flow chart of an exemplary process of a broadcast/multicast IPCF-based WLAN communication method 200 according to an embodiment of the present disclosure
  • FIG. 2B is a WLAN communication method according to the present disclosure between an access point and three clients. Schematic flow chart for interactive communication.
  • FIG. 2B For the sake of simplicity, only three clients are shown in FIG. 2B. In fact, any number of clients can be included as needed in the communication method according to the present disclosure.
  • the solid arrows represent messages sent by the access point to the client, while the dashed arrows represent messages sent by the client to the access point.
  • the following describes a WLAN communication method based on broadcast/multicast IPCF according to an embodiment of the present disclosure with reference to FIGS. 2A and 2B simultaneously.
  • the access point 22 simultaneously sends a polling request message to one or more clients 24, 26, and 28 among its associated clients.
  • the polling request message 2001 in Figure 2B may be broadcast or multicast, that is, the polling request message 2001 may be sent to all clients or to a part of the clients that the access point wants to poll. For example: assuming a total of 8 clients are associated with the access point, the access point can poll all 8 clients at a time, or only 4 of them at a time. If the access point only wants to poll 4 clients, the broadcast/multicast poll request message content only needs to include the downlink data of 4 clients.
  • the information in the broadcast/multicast polling request message 2001 at least includes the mac address of each client.
  • downlink data to be sent by the access point to the client may also be included.
  • the clients 24, 26 and 28 sequentially send polling response messages to the access point 22 in their response time windows.
  • the clients 24, 26 and 28 After the client receives the broadcast/multicast polling request message, the clients 24, 26 and 28 begin to send polling response messages 2003 to the access point in sequence.
  • the sending order can be obtained from the sequence of client mac addresses in the broadcast/multicast poll request message.
  • the following rules will be used to determine the response time window for sending polling response messages to the access point.
  • Each client has a predefined scheduled latest response time for sending a polling response message.
  • a simple way to define the scheduled latest response time can be: If a client requires a 2ms response time, it is predefined , then the latest response time of the Nth client is 2*Nms. Each client will monitor/calculate the response time of the previous client.
  • the predetermined latest response time can be specified by the access point, or can be calculated by the client based on its order among all clients, client configuration parameters, specific algorithms and other factors. This disclosure does not limit how to determine the scheduled latest response time of each client, and will not be described in detail here.
  • the response time window of the first client is calculated from the moment the broadcast/multicast polling request message is received. For each subsequent client, the respective response time window will begin after the client observes that the previous client received an ACK confirmation message from the access point or when the latest response time (timeout) of the previous client is reached. For example, the 2nd client's response time will start at the moment it observes the 1st client receiving an ACK acknowledgment message sent by the access point, or (if the access point does not send an ACK acknowledgment message or the 2nd client If no ACK confirmation message is observed), it starts after the response time of the first client reaches the predetermined latest response time (which is 2ms for the first client).
  • the first client After receiving the polling request message from the access point, the first client immediately sends a polling response message to the access point without delay.
  • the second client sends a polling response to the access point after detecting the end of the response time period of the first client according to the above rules.
  • the response time period here refers to the moment when the client observes that the previous client receives the ACK confirmation message sent by the access point, or when the response time of the previous client reaches the predetermined latest response time.
  • the 3rd client can send a polling response to the access point after detecting the end of the 2nd client's response period.
  • the M-th client can send a polling response to the access point after detecting the end of the response time period of the (M-1)-th client.
  • M is the total number of all clients to be polled by the access point.
  • the start time of the response time window is when the polling request message is received.
  • the end time is the scheduled latest response time of the first client
  • the start time of the response time window is the moment when the ACK confirmation message of the N-1th client is observed or the scheduled latest response time of the N-1th client is reached, and the end time It is the scheduled latest response time to reach the Nth client, where N represents any one from the 2nd client to the last client, that is, N>1 and N ⁇ M, M is the access point to be polled The total number of clients.
  • the access point 22 sends an ACK confirmation message to the client after receiving the client's polling response message.
  • the access point 22 will send an ACK confirmation message 2004 to the client.
  • the client does not receive the ACK message sent by the access point or the access point does not send the ACK confirmation message because it does not receive the polling response message from the client.
  • the access point can start sending the next broadcast/multicast polling request message, that is, repeat the operations of S202, S204 and S206 in the box.
  • the WLAN communication method adopts the broadcast/multicast IPCF mechanism. Compared with the unicast IPCF mechanism, the access point can send a polling request message to multiple clients at the same time, saving a lot of channel access time and can support More clients and further reduce communication jitter.
  • FIG. 3 is a flowchart of an exemplary process of a WLAN communication method 300 performed at an access point according to an embodiment of the present disclosure. The method specifically includes:
  • the access point simultaneously sends a polling request message to one or more clients among its associated clients.
  • the access point receives polling response messages sent by one or more clients in sequence.
  • the access point sends an ACK confirmation message to the corresponding client after receiving each polling response message.
  • the access point after the access point receives polling response messages from all clients or after reaching the predetermined latest response time of the last client, the access point sends the next broadcast/multicast polling request message, and repeats Perform the above operations, that is, repeat the operations in blocks S302, S304, and S306.
  • the polling request message includes respective mac addresses of the one or more clients.
  • the polling request message may also include data to be sent by the access point to the one or more clients.
  • the polling request message sent by the access point to the client can only include the mac address, and when there is downlink data that needs to be sent to the client, the polling request message can also include downlink data. .
  • FIG. 4 is a flowchart of an exemplary process of a WLAN communication method 400 performed at a client according to an embodiment of the present disclosure. The method specifically includes:
  • the client receives a polling request message from the access point.
  • the client sends a polling response message to the AP in its response time window, where,
  • the start time of the response time window is the moment when the polling request message is received, and the end time is the time when the polling request message is received.
  • the scheduled latest response time of the first client is the first client among all clients that receive the polling request message from the access point.
  • the start time of the response time window is the moment when the client observes the ACK confirmation message of the N-1 client or reaches the scheduled latest response time of the N-1 client
  • the end time is the scheduled latest response time to reach the Nth client, where N>1, N ⁇ M, and M is the total number of clients to be polled by the access point.
  • a client needs to detect the response end event of its previous client, that is, the previous client receives the ACK confirmation message sent by the access point, and does not care about the data of the previous client. After observing that the previous client received an ACK confirmation message, the client can send its own polling response message.
  • the latest response time of this time window will not be affected by the actual response time of its previous client. That is to say, the response time of a client can be advanced, but the latest response time is a predetermined fixed time.
  • the client receives an ACK confirmation message from the access point.
  • the polling request message includes the mac addresses of all clients, and the client can determine the order in which it sends the polling response messages among all clients based on the mac address, and according to the order Determines the scheduled latest response time for this client.
  • FIG. 5 shows a block diagram of an exemplary configuration of an access point 500 for performing the WLAN communication method shown in FIG. 3 .
  • the access point 500 includes: a polling request sending unit 502 , a polling response receiving unit 504 , an ACK sending unit 506 and a repetition control unit 508 .
  • the polling request sending unit 502 is configured to simultaneously send a polling request message to one or more clients among its associated clients.
  • the polling response receiving unit 504 is configured to receive polling response messages sent by the one or more clients in sequence.
  • the ACK sending unit 506 is configured to send an ACK confirmation message to the corresponding client after receiving each polling response message.
  • the repetition control unit 508 is configured to control the polling request sending unit to send the next polling request message after receiving polling response messages from all clients or after reaching the predetermined latest response time of the last client.
  • FIG. 6 shows a block diagram of an exemplary configuration of a client 600 for performing the WLAN communication method shown in FIG. 4 .
  • the client 600 includes: a polling request receiving unit 602 , a polling response sending unit 604 , and an ACK receiving unit 606 .
  • the polling request receiving unit 602 is configured to receive a polling request message from the access point.
  • the polling response sending unit 604 is configured to send a polling response message to the access point within the response time window of the client.
  • the start time of the response time window is the moment when the polling request message is received.
  • the end time is the scheduled latest response time of the 1st client. If the client is the Nth client, the start time of the response time window is the moment when the ACK confirmation message of the N-1th client is observed. Or the scheduled latest response time of the N-1th client is reached, and the end time is the scheduled latest response time of the Nth client, where N>1 and N ⁇ M, M is the client to be polled by the access point total.
  • the ACK receiving unit 608 is configured to receive an ACK confirmation message from the access point.
  • the WLAN communication method according to the present disclosure and the access point and client communicating using the communication method have at least one or more of the following advantages.
  • each unit of the access point and client described above can be implemented by hardware, software, or a combination of hardware and software.
  • computing device 700 may include at least one processor 702 that executes at least one computer-readable instructions (i.e., in software form as described above) stored or encoded in a computer-readable storage medium (i.e., memory 704). implemented elements).
  • processor 702 that executes at least one computer-readable instructions (i.e., in software form as described above) stored or encoded in a computer-readable storage medium (i.e., memory 704). implemented elements).
  • computer-executable instructions are stored in memory 704 that, when executed, enable at least one processor 702 to perform operations performed by the access point.
  • computer-executable instructions that may cause the processor 702 to perform operations performed by the client may be stored in the memory 704 .
  • a non-transitory machine-readable medium may have machine-executable instructions (ie, the above-mentioned elements implemented in software form), which instructions, when executed by a machine, cause the machine to perform the various embodiments of the present disclosure as described above in conjunction with FIGS. 1-6 Describes various operations and functions.
  • a computer program includes computer-executable instructions that, when executed, cause at least one processor to perform each of the steps described above in conjunction with FIGS. 1-6 in various embodiments of the present disclosure. operations and functions.
  • a computer program product includes computer-executable instructions that, when executed, cause at least one processor to perform the steps described above in connection with FIGS. 1-6 in various embodiments of the present disclosure.

Abstract

本公开涉及WLAN通信方法、接入点、客户端、计算设备和存储介质。一种WLAN通信方法,包括:接入点向其关联的客户端中的一个或多个客户端同时发送轮询请求消息;所述接入点依次接收所述一个或多个客户端发送的轮询响应消息;所述接入点在接收到每一个轮询响应消息之后向对应的客户端发送ACK确认消息;在所述接入点接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,从所述接入点向客户端发送轮询请求消息开始重复执行以上操作。

Description

WLAN通信方法、接入点、客户端、计算设备和存储介质 技术领域
本公开通常涉及无线通信技术领域,更具体地,涉及WLAN通信方法、接入点、客户端、计算设备和存储介质。
背景技术
从消费产品到工业设备,WLAN(802.11a/b/g/n/ac/ax)技术在当今非常流行。消费产品通信侧重于快速、高吞吐量,而工业通信对于低延迟和低抖动具有更高的要求。工业通信协议,如PROFINET,对抖动有很高的要求,主流的WLAN技术很难满足这些要求。由于WLAN原生的CSMA/CA(带有冲突避免的载波侦听多路访问)机制,WLAN设备在成功竞争到信道访问权之前不能传输数据。在同一信道上存在大量的WLAN设备将增加信道访问争夺时间,并意味着信道访问延迟具有巨大的不同。这种随机访问意味着WLAN技术不能提供确定性的通信。另一方面,消费品市场比工业市场大得多,因此新一代的WLAN标准、芯片组和产品在提高吞吐量方面有更大动力,而对于降低抖动则研究不多。
因此,面临的挑战是如何利用和扩展主流的WLAN功能,以满足工业延迟/抖动的要求,而不需要在芯片级别定制硬件。
发明内容
在下文中给出关于本发明的简要概述,以便提供关于本发明的某些方面的基本理解。应当理解,这个概述并不是关于本发明的穷举性概述。它并不是意图确定本发明的关键或重要部分,也不是意图限定本发明的范围。其目的仅仅是以简化的形式给出某些概念,以此作为稍后论述的更详细描述的前序。
有鉴于此,本公开提出了一种采用广播/多播IPCF机制的WLAN通信方法,接入点可以同时向多个客户端发送一个轮询请求消息,节省了大量的信道访问时间,可以支持更多的客户端,并且进一步减小通信抖动。
根据本公开的一个方面,提供了一种WLAN通信方法,包括:
接入点向其关联的客户端中的一个或多个客户端同时发送轮询请求消息;
所述接入点依次接收所述一个或多个客户端发送的轮询响应消息;
所述接入点在接收到每一个轮询响应消息之后向对应的客户端发送ACK确认消息;
在所述接入点接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,从所述接入点向客户端发送轮询请求消息开始重复执行以上操作。
可选地,在上述方面的一个示例中,所述轮询请求消息包括所述一个或多个客户端各自的mac地址。
可选地,在上述方面的一个示例中,所述轮询请求消息进一步包括:所述接入点要发送给所述一个或多个客户端的数据。
根据本公开的另一方面,提供了一种WLAN通信方法,包括:
客户端接收来自接入点的轮询请求消息;
所述客户端在其响应时间窗口内向所述接入点发送轮询响应消息,其中,
如果所述客户端是接收所述接入点的轮询请求消息的全部客户端中的第1个客户端,所述响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间,
如果所述客户端是第N个客户端,响应时间窗口的开始时间是该客户端观察到第N-1个客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,其中N>1且N≤M,M是接入点要轮询的客户端的总数;
所述客户端接收来自所述接入点的ACK确认消息。
可选地,在上述方面的一个示例中,所述轮询请求消息中包括所述全部客户端的mac地址,所述客户端根据所述mac地址确定其在全部客户端中发送所述轮询响应消息的顺序,并根据所述顺序确定该客户端的预定最晚响应时间。
根据本公开的另一方面,提供了一种WLAN通信方法,包括:
接入点向其关联的客户端中的一个或多个客户端同时发送轮询请求消息;
客户端在其响应时间窗口中依次向所述接入点发送轮询响应消息,其中,
如果所述客户端是接收所述接入点的轮询请求消息的全部客户端中的第1个客户端,所述响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间,
如果所述客户端是第N个客户端,响应时间窗口的开始时间是观察到第N-1个 客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,其中N>1且N≤M,M是接入点要轮询的客户端的总数;
所述接入点在接收到客户端的轮询响应消息之后向该客户端发送ACK确认消息;
在所述接入点接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,从所述接入点向客户端发送轮询请求消息开始重复执行以上操作。
根据本公开的另一方面,提供了一种无线接入点,包括:
轮询请求发送单元,被配置为向其关联的客户端中的一个或多个客户端同时发送轮询请求消息;
轮询响应接收单元,被配置为依次接收所述一个或多个客户端发送的轮询响应消息;
ACK发送单元,被配置为在接收到每一个轮询响应消息之后向对应的客户端发送ACK确认消息;以及
重复控制单元,被配置为在接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,控制所述轮询请求发送单元发送下一个轮询请求消息。
根据本公开的另一方面,提供了一种客户端,包括:
轮询请求接收单元,被配置为接收来自接入点的轮询请求消息;
轮询响应发送单元,被配置为在客户端的响应时间窗口内向所述接入点发送轮询响应消息,其中,
如果所述客户端是接收所述接入点的轮询请求消息的全部客户端中的第1个客户端,所述响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间,
如果所述客户端是第N个客户端,响应时间窗口的开始时间是观察到第N-1个客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,其中N>1且N≤M,M是接入点要轮询的客户端的总数;
ACK接收单元,被配置为接收来自所述接入点的ACK确认消息。
根据本公开的另一方面,提供了计算设备,包括:至少一个处理器;以及与所述至少一个处理器耦合的一个存储器,所述存储器用于存储指令,当所述指令被所述至少一个处理器执行时,使得所述处理器执行如上所述的方法。
根据本公开的另一方面,提供了一种非暂时性机器可读存储介质,其存储有可执行指令,所述指令当被执行时使得所述机器执行如上所述的方法。
根据本公开的另一方面,提供了一种计算机程序,包括计算机可执行指令,所述计算机可执行指令在被执行时使至少一个处理器执行如上所述的方法。
根据本公开的另一方面,提供了一种计算机程序产品,所述计算机程序产品被有形地存储在计算机可读介质上并且包括计算机可执行指令,所述计算机可执行指令在被执行时使至少一个处理器执行如上所述的方法。
根据本公开的WLAN通信方法以及利用该通信方法进行通信的接入点和客户端至少具有以下优势中的一项或多项。
-成本低,不需要增加额外的硬件。
-易于实现,在单播IPCF方案的基础上进行修改。
-在一定的周期时间要求下,可以支持更多的客户端;或者可以减少给定数量的客户端的周期时间。
-减少通信抖动。
附图说明
参照下面结合附图对本发明实施例的说明,会更加容易地理解本发明的以上和其它目的、特点和优点。附图中的部件只是为了示出本发明的原理。在附图中,相同的或类似的技术特征或部件将采用相同或类似的附图标记来表示。附图中:
图1是接入点与客户端之间采用基本的IPCF调度机制进行无线通信的示意性流程图。
图2A为根据本公开实施例的基于广播/多播IPCF的WLAN通信方法的示例性过程的流程图。
图2B是接入点和客户端之间采用根据本公开的WLAN通信方法进行交互通信的示意性流程图。
图3为根据本公开实施例在接入点处执行的WLAN通信方法的示例性过程的流程图。
图4为根据本公开实施例在客户端处执行的WLAN通信方法的示例性过程的流程图。
图5示出了用于执行图3所示的WLAN通信方法的接入点的示例性配置的框图。
图6示出了用于执行图4所示的WLAN通信方法的客户端的示例性配置的框图。
图7示出了根据本公开的实施例的用于实现WLAN通信方法的计算设备的方框图。其中,附图标记如下:
12、22:接入点                   14、16、18、24、26、28:客户端
1001、2001:轮询请求消息         1002:客户端给接入点的ACK确认消息
1003、2003:轮询响应消息         1004、2004:接入点给客户端的ACK确认消息
200、300、400:WLAN通信方法      S202、S204、S206、S208、S302、S304、S306、S308、S402、S404、S406:步骤
500:接入点                      502:轮询请求发送单元
504:轮询响应接收单元            506:ACK发送单元
508:重复控制单元                600:客户端
602:轮询请求接收单元            604:轮询响应发送单元
606:ACK接收单元                 700:计算设备
702:处理器                      704:存储器
具体实施方式
现在将参考示例实施方式讨论本文描述的主题。应该理解,讨论这些实施方式只是为了使得本领域技术人员能够更好地理解从而实现本文描述的主题,并非是对权利要求书中所阐述的保护范围、适用性或者示例的限制。可以在不脱离本公开内容的保护范围的情况下,对所讨论的元素的功能和排列进行改变。各个示例可以根据需要,省略、替代或者添加各种过程或组件。例如,所描述的方法可以按照与所描述的顺序不同的顺序来执行,以及各个步骤可以被添加、省略或者组合。另外,相对一些示例所描述的特征在其它例子中也可以进行组合。
如本文中使用的,术语“包括”及其变型表示开放的术语,含义是“包括但不限于”。术语“基于”表示“至少部分地基于”。术语“一个实施例”和“一实施例”表示“至少一个实施例”。术语“另一个实施例”表示“至少一个其他实施例”。术语“第一”、“第二”等可以指代不同的或相同的对象。下面可以包括其他的定义,无论是明确的还是隐含的。除非上下文中明确地指明,否则一个术语的定义在整个说明书中是一致的。
802.11标准规定了一种名为PCF(Point Coordination Function,点协调功能)的操作模式,其中信道访问是由接入点(Access Point,AP)以一种确定的方式安排的。然而,这种模式没有被广泛接受,因此不被任何相关的WLAN芯片组所支持。相反,基于争用的DCF模式(Distributed Coordination Function,分布式协调功能)和其演变的变体被广泛使用。
为了减少抖动,为工业领域提供确定性的WLAN(Wireless Local Area Network,无线局域网)通信,目前有一种简单的调度机制,称为IPCF(Industrial Point Coordination Function,工业点协调功能),它在DCF的“上层”运行,基于轮询请求/轮询响应消息。
图1示出了接入点与客户端之间采用基本的IPCF调度机制进行无线通信的示意性流程图。
在基本的IPCF调度机制中,WLAN客户端不主动发送数据包,而只是在被WLAN接入点轮询时才发送。
在图1中,首先,接入点12向第一客户端14发送轮询请求消息1001,其中可以包括下行链路数据(如果有的话),并且以预定的最大等待时间等待客户端的轮询响应消息,其中可以包括上行链路有效载荷数据(如果有的话)。
第一客户端14在收到轮询请求消息之后,先向接入点12发送ACK确认消息1002,然后再向接入点12发送轮询响应消息(上行链路数据消息)1003。
在接入点12接收到第一客户端14的轮询响应消息之后,接入点12向第一客户端14发送ACK确认消息1004。
在接入点12收到第一客户端14的轮询响应消息后,或者如果接入点12在最大等待时间内没有收到第一客户端的轮询响应消息,接入点12将向下一个客户端发送轮询请求消息。
在图1中,实线箭头表示接入点向客户端发送的消息,而虚线箭头表示客户端向接入点发送的消息。
接入点12针对所关联的其它客户端(在图1中为第二客户端16和第三客户端18),逐一重复轮询请求/轮询响应的过程。
采用这种方法,接入点和客户端在传输数据之前仍然需要与其他设备争夺信道访问权(例如,利用同一信道的其它接入点及其相关的客户端),但已经可以大大减少信道访问争夺冲突。特别是在可以控制无线电频率的使用的环境中(例如在工厂),可以完全避免这种信道访问争夺冲突。这种调度方案大大降低了随机信道访问时间的不确定性, AP和客户之间的通信抖动大大减少,它在没有外部干扰的情况下工作得很好。
在这种顺序逐一轮询的方案中,由于预先定义了一定的周期时间(接入点对所有客户端轮询一遍的时间),一个接入点能够支持的最大客户端的数目是非常有限的。例如:如果接入点向客户端发送轮询请求和接收轮询响应的过程花费2ms,在16ms的周期时间内,最多可以支持8个客户端。
为了解决上述问题,在上述IPCF调度方案的基础上,在本公开的技术方案中,将单播轮询请求修改为一种广播/多播轮询请求。所有相关客户可以同时接收来自AP的广播/多播轮询请求消息,然后逐一向AP发送轮询响应消息。在本公开中将这种调度方案称为广播/多播IPCF。
在本公开中,AP和接入点指的都是WLAN网络中的无线接入点,在本公开中,AP和接入点可以互换使用。
下面将结合附图来描述根据本公开实施例的基于广播/多播IPCF的WLAN通信方法。
图2A为根据本公开实施例的基于广播/多播IPCF的WLAN通信方法200的示例性过程的流程图;图2B是一个接入点和三个客户端之间采用根据本公开的WLAN通信方法进行交互通信的示意性流程图。
为了简单起见,在图2B中只显示了3个客户端,实际上,在根据本公开的通信方法中可以根据需要包括任意数量的客户端。在图2B中,实线箭头表示接入点向客户端发送的消息,而虚线箭头表示客户端向接入点发送的消息。
下面同时参考图2A和2B来说明根据本公开实施例的基于广播/多播IPCF的WLAN通信方法。
首先,在图2A的方框S202中,接入点22向其关联的客户端中的一个或多个客户端24、26和28同时发送轮询请求消息。
图2B中的轮询请求消息2001可以是广播或者多播,即,轮询请求消息2001可以发送给全部客户端,也可以发给接入点想要轮询的一部分客户端。例如:假设接入点总共关联8个客户端,接入点可以一次轮询所有的8个客户端,或者一次只轮询其中的4个。如果接入点只想轮询4个客户端,广播/多播轮询请求消息内容只需要包括4个客户端的下行链路数据。
其中,广播/多播轮询请求消息2001中的信息至少包括每个客户端的mac地址。可选地,还可以包括接入点要发送给客户端的下行链路数据(如果有的话)。
接着,在方框S204中,客户端24、26和28在其响应时间窗口中依次向所述接入点22发送轮询响应消息。
在客户端收到广播/多播轮询请求消息后,客户端24、26和28开始依次向接入点发送轮询响应消息2003。发送顺序可以从广播/多播轮询请求消息中的客户端mac地址序列中得到。对于某一个客户端,将通过以下规则来确定向接入点发送轮询响应消息的响应时间窗口。
●每个客户端都有一个预先定义的发送轮询响应消息的预定最晚响应时间,例如定义预定最晚响应时间的一种简单的方法可以是:如果预先定义一个客户端需要2ms的响应时间,那么第N个客户端的最晚响应时间是2*Nms。每个客户端将监视/计算前一个客户端的响应时间。
本领域技术人员可以理解,预定最晚响应时间可以由接入点来指定,也可以由客户端根据其在全部客户端中的顺序、客户端的配置参数、特定的算法等因素来计算。本公开对于如何确定每个客户端的预定最晚响应时间不做限定,在此不再详述。
●第1个客户端的响应时间窗口从收到广播/多播轮询请求消息的时刻开始计算。对于后续每一个客户端,各自的响应时间窗口将在该客户端观察到前一个客户端接收到接入点发送的ACK确认消息之后或达到前一个客户端的最晚响应时间(超时)时开始。例如,第2个客户端的响应时间将在它观察到第1个客户端接收到接入点发送的ACK确认消息的时刻开始,或者(在接入点没有发送ACK确认消息或第2个客户端没有观察到ACK确认消息的情况下)在第1个客户端的响应时间达到预定最晚响应时间(针对第1个客户端即为2ms)后开始。
●任何一个客户端的响应时间窗口将在其预定最晚响应时间超时后结束。
●第1个客户在收到接入点的轮询请求消息后,立即向接入点发送轮询响应消息,而没有延迟。
●第2个客户端在根据上述规则检测到第1个客户端的响应时间段结束后,向接入点发送轮询响应。这里的响应时间段指的就是该客户端观察到上一个客户端接收到接入点发送的ACK确认消息的时刻,或者在上一个客户端的响应时间达到预定最晚响应时间。
●第3个客户端可以在检测到第2个客户端的响应时间段结束后向接入点发送轮询响应。
●....
●第M个客户端在检测到第(M-1)个客户端的响应时间段结束后,可以向接入点发送轮询响应。这里M是接入点要轮询的全部客户端的总数。
概括来说,如果所述客户端是接收所述接入点的轮询请求消息的全部客户端中的第1个客户端,所述响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间,
如果所述客户端是第N个客户端,响应时间窗口的开始时间是观察到第N-1个客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,这里N表示从第2个客户端到最后一个客户端中的任意一个,即N>1且N≤M,M是接入点要轮询的客户端的总数。
在方框S206中,接入点22在接收到客户端的轮询响应消息之后向该客户端发送ACK确认消息。
从图2B中可以看到,在正常情况下,接入点22在收到每一个客户端的轮询响应消息之后都会给该客户端发送给一个ACK确认消息2004。在异常情况下,也可能存在客户端没有接收到接入点发送的ACK消息的情况或者接入点由于没有收到客户端的轮询响应消息而没有发送ACK确认消息。
最后,在方框S208中,在接入点收到全部客户端的轮询响应消息之后或检测到最后一个客户端的响应时间窗口结束后,也就是说达到第M个客户端的预定最晚响应时间时,接入点可以开始发送下一次广播/多播轮询请求消息,即重复方框中S202、S204和S206的操作。
根据本公开的WLAN通信方法采用广播/多播IPCF机制,与单播IPCF机制相比,接入点可以同时向多个客户端发送一个轮询请求消息,节省了大量的信道访问时间,可以支持更多的客户端,并且进一步减小通信抖动。
在图2所示的根据本公开实施例的基于广播/多播IPCF的WLAN通信方法中,涉及接入点和客户端两个方面。对于接入点,其执行的操作步骤如图3所示。图3为根据本公开实施例在接入点处执行的WLAN通信方法300的示例性过程的流程图,所述方法具体包括:
首先,在S302中,接入点向其关联的客户端中的一个或多个客户端同时发送轮询请求消息。
接着,在S304中,接入点依次接收一个或多个客户端发送的轮询响应消息。
在S306中,所述接入点在接收到每一个轮询响应消息之后向对应的客户端发送ACK 确认消息。
在S308中,在所述接入点接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,接入点发送下一次广播/多播轮询请求消息,并重复执行以上操作,即重复方框S302、S304、S306中的操作。
其中,轮询请求消息包括所述一个或多个客户端各自的mac地址。
可选地,轮询请求消息中还可以包括接入点要发送给所述一个或多个客户端的数据。
也就是说,接入点发送给客户端的轮询请求消息中可以只包括mac地址,而当存在需要发送给客户端的下行链路数据的情况下,轮询请求消息中还可以包括下行链路数据。
响应时间窗口的含义如以上所述,在此不再赘述。
以上参照图3说明了在接入点和客户端采用根据本公开的WLAN通信方法进行通信的过程中,接入点所执行的操作步骤。对于客户端所执行的操作步骤如图4所示。图4为根据本公开实施例在一个客户端处执行的WLAN通信方法400的示例性过程的流程图,所述方法具体包括:
在S402中,客户端接收来自接入点的轮询请求消息。
在S404中,客户端在其响应时间窗口中向AP发送轮询响应消息,其中,
如果该客户端是接收所述接入点的轮询请求消息的所有客户端中的第1个客户端,响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间;
如果该客户端是第N个客户端,响应时间窗口的开始时间是该客户端观察到第N-1个客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,其中N>1,N≤M,M是接入点要轮询的客户端的总数。
也即是说,一个客户端要检测它前一个客户端的响应结束事件,即前一个客户端收到接入点发送的ACK确认消息,而不关心它再前面的客户端的数据。在观察到前一个客户端收到ACK确认消息时,该客户端就可以发送它自己的轮询响应消息。
然而,这个时间窗口的最晚响应时间不会受到它前一个客户端实际响应时间的影响,也就是说,一个客户端的响应时间可以提前,但是最晚响应时间是预先确定的固定时间。
在S406中,所述客户端接收来自所述接入点的ACK确认消息。
其中,所述轮询请求消息中包括所述全部客户端的mac地址,所述客户端可以根据 所述mac地址确定其在全部客户端中发送所述轮询响应消息的顺序,并根据所述顺序确定该客户端的预定最晚响应时间。
图5示出了用于执行图3所示的WLAN通信方法的接入点500的示例性配置的框图。在图5中,接入点500包括:轮询请求发送单元502、轮询响应接收单元504、ACK发送单元506和重复控制单元508。
其中,轮询请求发送单元502被配置为向其关联的客户端中的一个或多个客户端同时发送轮询请求消息。
轮询响应接收单元504被配置为依次接收所述一个或多个客户端发送的轮询响应消息。
ACK发送单元506被配置为在接收到每一个轮询响应消息之后向对应的客户端发送ACK确认消息。
重复控制单元508被配置为在接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,控制所述轮询请求发送单元发送下一个轮询请求消息。
图6示出了用于执行图4所示的WLAN通信方法的客户端600的示例性配置的框图。在图6中,客户端600包括:轮询请求接收单元602、轮询响应发送单元604、ACK接收单元606。
轮询请求接收单元602被配置为接收来自接入点的轮询请求消息。
轮询响应发送单元604被配置为在客户端的响应时间窗口内向所述接入点发送轮询响应消息。
其中,如果所述客户端是接收所述接入点的轮询请求消息的全部客户端中的第1个客户端,所述响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间,如果所述客户端是第N个客户端,响应时间窗口的开始时间是观察到第N-1个客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,其中N>1且N≤M,M是接入点要轮询的客户端的总数。
ACK接收单元608被配置为接收来自所述接入点的ACK确认消息。
需要说明的是,图5所示的接入点500和图6所示的客户端600及其组成单元的结构仅仅是示例性的,本领域技术人员可以根据需要对图5和图6所示的结构框图进行修 改。
接入点500和客户端600的各个部分的操作和功能的细节例如可以与参照结合图1-4描述的本公开的WLAN通信方法的实施例的相关部分相同或类似,这里不再详细描述。
根据本公开的WLAN通信方法以及利用该通信方法进行通信的接入点和客户端至少具有以下优势中的一项或多项。
-成本低,不需要增加额外的硬件。
-易于实现,在单播IPCF方案的基础上做一些修改。
-在一定的周期时间要求下,可以支持更多的客户端;或者可以减少给定数量的客户端的周期时间。
-减少通信抖动。
如上参照图1至图6,对根据本公开的实施例的WLAN通信方法以及接入点和客户端的实施例进行了描述。以上所述的接入点和客户端的各个单元可以采用硬件实现,也可以采用软件或者硬件和软件的组合来实现。
图7示出了根据本公开的实施例的用于实现WLAN通信方法的计算设备700的方框图。根据一个实施例,计算设备700可以包括至少一个处理器702,处理器702执行在计算机可读存储介质(即,存储器704)中存储或编码的至少一个计算机可读指令(即,上述以软件形式实现的元素)。
在一个实施例中,在存储器704中存储计算机可执行指令,该计算机可执行指令在被执行时使得至少一个处理器702可以完成接入点所执行的操作。此外,存储器704中还可以存储可以使得处理器702完成客户端所执行的操作的计算机可执行指令。
应该理解,在存储器704中存储的计算机可执行指令当执行时使得至少一个处理器702进行本公开的各个实施例中以上结合图1-6描述的各种操作和功能。
根据一个实施例,提供了一种非暂时性机器可读介质。该非暂时性机器可读介质可以具有机器可执行指令(即,上述以软件形式实现的元素),该指令当被机器执行时,使得机器执行本公开的各个实施例中以上结合图1-6描述的各种操作和功能。
根据一个实施例,提供了一种计算机程序,包括计算机可执行指令,所述计算机可执行指令在被执行时使至少一个处理器执行本公开的各个实施例中以上结合图1-6描述的各种操作和功能。
根据一个实施例,提供了一种计算机程序产品,包括计算机可执行指令,所述计算 机可执行指令在被执行时使至少一个处理器执行本公开的各个实施例中以上结合图1-6描述的各种操作和功能。
上面结合附图阐述的具体实施方式描述了示例性实施例,但并不表示可以实现的或者落入权利要求书的保护范围的所有实施例。在整个本说明书中使用的术语“示例性”意味着“用作示例、实例或例示”,并不意味着比其它实施例“优选”或“具有优势”。出于提供对所描述技术的理解的目的,具体实施方式包括具体细节。然而,可以在没有这些具体细节的情况下实施这些技术。在一些实例中,为了避免对所描述的实施例的概念造成难以理解,公知的结构和装置以框图形式示出。
本公开内容的上述描述被提供来使得本领域任何普通技术人员能够实现或者使用本公开内容。对于本领域普通技术人员来说,对本公开内容进行的各种修改是显而易见的,并且,也可以在不脱离本公开内容的保护范围的情况下,将本文所定义的一般性原理应用于其它变型。因此,本公开内容并不限于本文所描述的示例和设计,而是与符合本文公开的原理和新颖性特征的最广范围相一致。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (11)

  1. 一种WLAN通信方法,包括:
    接入点向其关联的客户端中的一个或多个客户端同时发送轮询请求消息;
    所述接入点依次接收所述一个或多个客户端发送的轮询响应消息;
    所述接入点在接收到每一个轮询响应消息之后向对应的客户端发送ACK确认消息;以及
    在所述接入点接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,从所述接入点向客户端发送轮询请求消息开始重复执行以上操作。
  2. 如权利要求1所述的方法,其中,
    所述轮询请求消息包括所述一个或多个客户端各自的mac地址。
  3. 如权利要求1所述的方法,其中,
    所述轮询请求消息进一步包括:所述接入点要发送给所述一个或多个客户端的数据。
  4. 一种WLAN通信方法,包括:
    客户端接收来自接入点的轮询请求消息;
    所述客户端在其响应时间窗口内向所述接入点发送轮询响应消息,其中,
    如果所述客户端是接收所述接入点的轮询请求消息的全部客户端中的第1个客户端,所述响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间,
    如果所述客户端是第N个客户端,响应时间窗口的开始时间是该客户端观察到第N-1个客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,其中N>1且N≤M,M是接入点要轮询的客户端的总数;
    所述客户端接收来自所述接入点的ACK确认消息。
  5. 如权利要求4所述的方法,其中,
    所述轮询请求消息中包括所述全部客户端的mac地址,所述客户端根据所述mac 地址确定其在全部客户端中发送所述轮询响应消息的顺序,并根据所述顺序来确定该客户端的预定最晚响应时间。
  6. 一种WLAN通信方法,包括:
    接入点向其关联的客户端中的一个或多个客户端同时发送轮询请求消息;
    客户端在其响应时间窗口中依次向所述接入点发送轮询响应消息,其中,
    如果所述客户端是接收所述接入点的轮询请求消息的全部客户端中的第1个客户端,所述响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间,
    如果所述客户端是第N个客户端,响应时间窗口的开始时间是观察到第N-1个客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,其中N>1且N≤M,M是接入点要轮询的客户端的总数;
    所述接入点在接收到客户端的轮询响应消息之后向该客户端发送ACK确认消息;
    在所述接入点接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,从所述接入点向客户端发送轮询请求消息开始重复执行以上操作。
  7. 一种无线接入点,包括:
    轮询请求发送单元,被配置为向其关联的客户端中的一个或多个客户端同时发送轮询请求消息;
    轮询响应接收单元,被配置为依次接收所述一个或多个客户端发送的轮询响应消息;
    ACK发送单元,被配置为在接收到每一个轮询响应消息之后向对应的客户端发送ACK确认消息;以及
    重复控制单元,被配置为在接收到全部客户端的轮询响应消息之后或达到最后一个客户端的预定最晚响应时间后,控制所述轮询请求发送单元发送下一个轮询请求消息。
  8. 一种客户端,包括:
    轮询请求接收单元,被配置为接收来自接入点的轮询请求消息;
    轮询响应发送单元,被配置为在客户端的响应时间窗口内向所述接入点发送轮询响应消息,其中,
    如果所述客户端是接收所述接入点的轮询请求消息的全部客户端中的第1个客户端,所述响应时间窗口的开始时间是收到所述轮询请求消息的时刻,结束时间是所述第1个客户端的预定最晚响应时间,
    如果所述客户端是第N个客户端,响应时间窗口的开始时间是观察到第N-1个客户端的ACK确认消息的时刻或达到第N-1个客户端的预定最晚响应时间,结束时间是达到第N个客户端的预定最晚响应时间,其中N>1且N≤M,M是接入点要轮询的客户端的总数;
    ACK接收单元,被配置为接收来自所述接入点的ACK确认消息。
  9. 计算设备(600),包括:
    至少一个处理器(602);以及
    与所述至少一个处理器(602)耦合的一个存储器(604),所述存储器用于存储指令,当所述指令被所述至少一个处理器(602)执行时,使得所述处理器(602)执行如权利要求1-6中任意一项所述的方法。
  10. 一种非暂时性机器可读存储介质,其存储有可执行指令,所述指令当被执行时使得所述机器执行如权利要求1到6中任意一项所述的方法。
  11. 一种计算机程序产品,所述计算机程序产品被有形地存储在计算机可读介质上并且包括计算机可执行指令,所述计算机可执行指令在被执行时使至少一个处理器执行根据权利要求1至6中任意一项所述的方法。
PCT/CN2022/090646 2022-04-29 2022-04-29 Wlan通信方法、接入点、客户端、计算设备和存储介质 WO2023206526A1 (zh)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000183923A (ja) * 1998-12-15 2000-06-30 Matsushita Refrig Co Ltd 通信システムにおけるポーリング方法
JP2002199473A (ja) * 2000-12-25 2002-07-12 Fujitsu Denso Ltd データ収集システム及びデータ収集方法
CN106256164A (zh) * 2014-06-09 2016-12-21 英特尔公司 用于Wi‑Fi的多用户调度信道状态报告

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000183923A (ja) * 1998-12-15 2000-06-30 Matsushita Refrig Co Ltd 通信システムにおけるポーリング方法
JP2002199473A (ja) * 2000-12-25 2002-07-12 Fujitsu Denso Ltd データ収集システム及びデータ収集方法
CN106256164A (zh) * 2014-06-09 2016-12-21 英特尔公司 用于Wi‑Fi的多用户调度信道状态报告

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