CN103402270A - Low-frequency band and low-power consumption wireless local area network station to station (STS) communication method - Google Patents

Abstract

The invention discloses a communication method of STS in a wireless local area network with low frequency band and low power consumption. The implementation steps are as follows: (1) one of the communication stations sends data or a communication request to the access point; (2) the access point receives After receiving the data or communication request, judge whether the two parties meet the STS communication conditions, and if the conditions are met, send the establishment of STS communication request to the two sites; (3) After receiving the request, the two parties proceed to the STS communication mode. The invention allows multiple STS communication pairs to exist in the network, effectively improves network capacity and reduces transmission time delay.

Description

A STS communication method in a low-band low-power wireless local area network

technical field

The invention belongs to the technical field of network communication, and particularly relates to a site-to-site direct transmission communication method in a low-frequency low-power wireless local area network, which is mainly used to improve network capacity and throughput, reduce site energy consumption, and reduce transmission delay.

Background technique

The wireless local area network based on the IEEE802.11 standard allows wireless connection in the local area network environment using the 2.4 or 5.8GHz radio frequency band in the industrial technology medical ISM frequency band that does not require authorization. There are mainly two networking architectures, one with fixed infrastructure and the other with no fixed infrastructure. Wireless LANs with fixed infrastructure are used in a wide range of applications, from homes to businesses to Internet access hotspots.

In a wireless local area network with fixed infrastructure, the communication between any two stations must be forwarded by the access point AP, and the process is as follows:

(1) One of the communication parties competes for the channel, and sends the data to the access point AP after obtaining the right to use the channel;

(2) The access point AP re-competes for the channel, and sends the received data to the other party after obtaining the right to use the channel.

The advantage of this method is that it realizes the communication between two sites in the LAN environment, but it has the following defects:

(1) Each communication must be forwarded by the access point AP, which increases the transmission delay;

(2) Two competition channels are required, which increases the competition delay;

(3) There can only be at most one link communicating at each moment, and the network capacity is small;

(4) When the station is far away from the access point AP, the throughput is small and the power consumption is large.

The current IEEE TGah working group is researching low-frequency low-power wireless LAN, which requires to work in the frequency band below 1GHz, with a single-hop coverage distance of up to 1Km and support for 6000 sites. The above-mentioned disadvantages of the prior art make it impossible to meet this requirement.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the above-mentioned prior art, and propose a communication method of STS (Station To Station) in a low-frequency band low-power wireless LAN to improve network capacity and throughput, reduce site energy consumption, and reduce transmission delay .

The technical train of thought that realizes the object of the present invention is: when two stations will communicate, access point AP judges whether these two stations satisfy the condition of STS communication according to the distance between two stations and channel condition, if satisfied, then send to two stations Request to establish STS communication.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A communication method for STS in a low-frequency band low-power wireless local area network, the wireless local area network has an access point, and at least a pair of communication first station and second station, the method includes the following steps:

(1) The first site sends data to the second site;

(2) The first station sends a direct communication request frame to the access point;

(3) After receiving the direct communication request frame, the access point judges whether the first station and the second station can perform STS communication, wherein, if the first station and the second station STS communication is possible, then the access point sends a direct communication permission frame to the first station and the second station, and enters step (5); otherwise, sends a permission to send frame to the first station , and go to step (4);

(4) After receiving the permission to send frame, the first station forwards the data to the second station through the access point;

(5) The first station prepares to send data after receiving the direct communication permission frame, and the second station prepares to receive data after receiving the direct communication permission frame;

(6) The first station sends data to the second station, and then the second station sends an acknowledgment frame to the first station.

It should be noted that the direct communication request frame includes a receiving address, a sending address and a destination address, wherein the receiving address is an address of an access point, the sending address is an address of the first station, and the destination The address is the address of the second site.

It should be noted that, the access point judging whether the first station and the second station can perform STS communication includes the following steps:

(1) The access point checks whether the first station and the second station support STS communication, if both the first station and the second station support it, go to step (2); otherwise go to step (3);

(2) Check whether the distance and channel conditions between the first station and the second station allow STS communication, if so, go to step (4); otherwise go to step (3);

(3) The first site and the second site do not support STS communication;

(4) The first station and the second station support STS communication.

It should be noted that the direct communication permission frame includes receiving address 1 and receiving address 2, wherein the receiving address 1 is the address of the first site, and the receiving address 2 is the address of the second site address.

It should be noted that the said first station forwards the data to the second station through the access point, including the following steps:

(1) The first station sends data to the access point;

(2) After receiving the data, the access point sends a confirmation frame to the first station;

(3) The access point competes for the channel and obtains the right to use the channel;

(4) After the access point obtains the right to use the channel, it sends a request to send a frame to the second station;

(5) After receiving the request to send frame, the second station sends a permission to send frame to the access point;

(6) After receiving the permission to send frame, the access point sends the data received in step (2) to the second station;

(7) After receiving the data, the second station sends an acknowledgment frame to the access point.

The beneficial effects of the present invention are:

1. After the first station reserves a channel with the access point, it directly sends the data to the second station instead of forwarding it through the access point, which reduces the transmission time and waiting time, thereby reducing the transmission delay;

2. Through the introduction of STS communication, there can be two or more pairs of site communication in the network, thereby increasing the network capacity;

3. When the distance between two sites with data to be transmitted is closer than the distance between the two sites and the access point, the use of STS communication can increase the data transmission rate and reduce the transmission power, thereby improving network throughput. Save site energy.

Description of drawings

Fig. 1 is a work flow chart of the present invention;

Fig. 2 is an application scene of the present invention;

Fig. 3 is the frame exchange process of the prior art for the application scenario of Fig. 2;

FIG. 4 is the frame exchange process in FIG. 2 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

In order to describe the present invention conveniently, make following simplification:

The access point is: AP;

The first station is: STA1;

The second station is STA2:;

The direct communication request frame is: eRTS;

The direct communication permission frame is: eCTS;

The request to send frame is: RTS;

The permission to send frame is: CTS;

The confirmation frame is: ACK;

As shown in Figure 1, the concrete steps of the present invention are as follows:

Step 1, the station STA1 sends a frame eRTS to the access point AP;

Among them, STA1 respectively writes the address of AP, the address of STA1 and the address of STA2 into the receiving address, sending address and destination address of the frame eRTS in order; and then sends the eRTS to the AP.

Step 2, the AP receiving the eRTS judges whether STA1 and STA2 can perform STS communication, including:

(2a) AP checks whether STA1 and STA2 support STS communication, if both STA1 and STA2 support it, go to step (2b), otherwise go to step (2c);

(2b) Check whether the distance and channel conditions between STA1 and STA2 allow STS communication, if the conditions are met, go to step (2d), otherwise go to step (2c);

(2c) STA1 and STA2 do not support STS communication, AP sends a frame CTS to STA1 and enters step 3;

(2d) STA1 and STA2 support STS communication, AP sends a frame eCTS to STA1 and STA2 and enters step 4.

Step 3, STA1 receiving the CTS forwards the data to STA2 through the AP, including:

(3a) STA1 sends data to AP;

(3b) The AP receiving the data sends a frame ACK to STA1;

(3c) AP competes for the channel and obtains the right to use the channel;

(3d) The AP that has obtained the right to use the channel sends a frame RTS to STA2;

(3e) STA2 receiving the RTS sends a frame CTS to the AP;

(3f) The AP receiving the CTS sends the data received in step (4b) to STA2;

(3g) STA2 receiving the data sends a frame ACK to the AP.

Step 4, STA1 receiving the eCTS sends data to STA2, including:

(4a) STA1 receiving eCTS prepares for sending data, and STA2 receiving eCTS prepares for receiving data;

(4b) STA1 sends data to STA2, and then STA2 sends frame ACK to STA1.

Effect of the present invention can be further illustrated by accompanying drawing:

As shown in FIG. 2 , in a wireless local area network with one access point AP and two stations, station STA1 wants to transmit data to STA2.

As shown in FIG. 3 , for the scenario in FIG. 2 , the frame exchange process of stations STA1 and STA2 is performed using the existing wireless local area network communication mode.

As shown in FIG. 4 , for the scenario in FIG. 2 , the frame exchange process of stations STA1 and STA2 using the STS communication method of the present invention.

By comparing Fig. 3 and Fig. 4, it can be obtained that the present invention reduces the number of frame exchanges and waiting time during the data transmission process of STA1 and STA2, thereby reducing the transmission delay of STA1 and STA2.

For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and ideas described above, and all these changes and modifications should fall within the protection scope of the claims of the present invention.

Claims (5)

1. the communication means of STS in a low-frequency range low-consumption wireless local area network (LAN), have access point in described WLAN (wireless local area network), and the first website of at least one pair of communication and the second website, it is characterized in that, said method comprising the steps of:

(1) described the first website sends data to described the second website;

(2) described the first website sends a direct communication claim frame to described access point;

(3) after described access point is received described direct communication claim frame, judge whether described the first website and described the second website can carry out STS and communicate by letter, wherein, if can carrying out STS with described the second website, described the first website communicates by letter, described access point sends a direct communication allowance frame to described the first website and described the second website, and enters step (5); Otherwise, send one and permit sending frame to described the first website, and enter step (4);

(4) after described first stop point receives that described allowance sends frame, data are transmitted to described the second website by described access point;

(5) described first stop point is done the preparation that sends data after receiving direct communication allowance frame, and described second station point is done the preparation of reception data after receiving direct communication allowance frame;

(6) the described first stop data of naming a person for a particular job are sent to described the second website, and then described the second website sends acknowledgement frame to described the first website.

2. communication means according to claim 1, it is characterized in that, described direct communication claim frame comprises receiver address, sends address and destination address, wherein, described receiver address is the address of access point, described transmission address is the address of described the first website, and described destination address is the address of the second website.

3. communication means according to claim 1, is characterized in that, described access point judges whether described the first website and described the second website can carry out STS and communicate by letter, and comprise the following steps:

(1) whether described the first website of described access point check supports that with described the second website STS communicates by letter, if described the first website and described the second website all support, enter step (2); Otherwise enter step (3);

(2) whether described the first website of check allows STS to communicate by letter with the distance between described the second website with channel conditions, as meets, and enters step (4); Otherwise enter step (3);

(3) described the first website does not support that with described the second website STS communicates by letter;

(4) described the first website supports that with described the second website STS communicates by letter.

4. communication means according to claim 1, it is characterized in that, described direct communication is permitted frame and is comprised receiver address 1 and receiver address 2, wherein, in described receiver address 1, being the address of described the first website, is the address of described the second website in described receiver address 2.

5. communication means according to claim 1, is characterized in that, the described described first stop data of naming a person for a particular job are transmitted to described the second website by described access point, comprise the following steps:

(1) the described first stop data of naming a person for a particular job are sent to described access point;

(2), after described access point is received data, send acknowledgement frame to described the first website;

(3) described access point competitive channel obtain the channel right to use;

(4), after described access point obtains the channel right to use, send request and send frame to described the second website;

(5), after described second station point receives that described request sends frame, send and permit sending frame to described access point;

(6) after described access point received that described allowance sends frame, the data of receiving in forwarding step (2) were to described the second website;

(7), after described second station point is received data, send acknowledgement frame to described access point.

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