CN103002514B - The method and apparatus of transmission information - Google Patents

Abstract

Embodiments of the present invention provide a method and device for transmitting information. The method for transmitting information includes: obtaining the highest protocol version/capability supported by some or all stations within the coverage area; transmitting according to a protocol version/capability that is the same as or lower than the first protocol version/capability or a recorded protocol version/capability The information carrying the duration field, wherein the first protocol version/capability is the lowest one among the highest protocol versions/capabilities supported by the part or all stations. Therefore, the method and device for transmitting information in the embodiments of the present invention can ensure that in a network where there are stations supporting different protocol versions/capabilities, by selecting an appropriate protocol version/capability mode to send short data frame exchanges, network allocation vectors can be realized. set correctly.

Description

Method and device for transmitting information

technical field

The embodiments of the present invention relate to the technical field of communications, and more specifically, to a method and device for transmitting information.

Background technique

The IEEE802.11 working group has formulated standards such as IEEE802.11a/b/g/n since 1997, and is currently formulating the IEEE802.11ac standard, which will be backward compatible with the IEEE802.11n standard. In the process of IEEE802.11/WLAN (Wireless Local Area Networks, wireless local area network) shared media access, in order to reduce the collision probability of each STA (Station, site) access in wireless communication, MAC (Media Access Control, media access control) The layer adopts the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism to realize the monitoring and collision avoidance of the channel, which is called DCF (Distributed Coordination Function) in the IEEE 802.11 standard. coordination function). In order to enhance the QoS (Quality of Service) guarantee capability of WLAN, the IEEE802.11e standard introduces the EDCA (Enhanced Distribution Channel Access) mechanism on the basis of DCF. IEEE802.11ac follows the EDCA mechanism.

In order to solve the data collision problem caused by hidden nodes, IEEE802.11 usually adopts the NAV (Network Allocation Vector, network allocation vector) method. NAV logically exists in the MAC frame, and provides a virtual carrier sense mechanism to overcome the problem that the physical layer cannot detect hidden nodes. Each MAC frame carries a "duration" field, which is used to update the network allocation vector NAV of other stations (non-information-transmitting stations) except the information-transmitting station. The IEEE802.11ac protocol provides RTS/CTS (request to send/clear to send, request to send/clear to send) frame exchange and short data frame exchange to set the network allocation vector NAV.

The RTS/CTS frame exchange method requires the requester to send an RTS frame to the requested party, and the requested party needs to reply with a CTS frame. Since neither the RTS frame nor the CTS frame carries useful data, the actual utilization rate and throughput of the network are affected. Therefore, the short data frame exchange mode can be adopted to solve the problem of low actual utilization rate and throughput of the network in the RTS/CTS frame exchange mode. However, since different stations support different protocol versions/capabilities, if a station supporting a low protocol version/capability receives a data frame sent by a station supporting a high protocol version/capability and cannot demodulate the data frame, it will not be able to update The respective network allocation vectors.

Contents of the invention

Embodiments of the present invention provide a method and device for transmitting information, which can ensure that some or all stations in the network can correctly set the network allocation vector NAV.

On the one hand, a method for transmitting information is provided, including: obtaining the highest protocol version/capability supported by some or all stations within the coverage area; or recording The protocol version/capability transmits the information carrying the duration field, wherein the first protocol version/capability is the lowest one among the highest protocol version/capability supported by some or all stations, so that the non-transmitting station sets the network according to the duration field Allocate vectors.

In another aspect, a method for transmitting information is provided, including: listening to information carrying a duration field, wherein the information is transmitted by a station transmitting the information according to a protocol version/capability that is the same as or lower than the first protocol version/capability or Recorded protocol version/capability transmission, the first protocol version/capability is the lowest one among the highest protocol versions/capabilities supported by some or all stations within the coverage of the station that transmits information.

In yet another aspect, a device for transmitting information is provided, including: a version acquisition unit, configured to acquire the highest protocol version/capability supported by some or all stations within the coverage; a transmission unit, configured to communicate with the first protocol version/capability Protocol versions/capabilities with the same or lower capabilities or recorded protocol versions/capabilities transmit the information carrying the duration field, where the first protocol version/capability is the lowest one among the highest protocol versions/capabilities supported by some or all stations, so that The station that does not transmit information sets the network allocation vector according to the duration field.

In yet another aspect, a device for transmitting information is provided, including: an interception unit configured to intercept information carrying a duration field, wherein the information is transmitted by a station that transmits information in accordance with the same or lower protocol version/capability protocol version/capability or recorded protocol version/capability transmission, the first protocol version/capability is the lowest one of the highest protocol version/capability supported by some or all stations within the coverage of the station transmitting information ; A setting unit, configured to set a network allocation vector according to the duration field.

The method and device for transmitting information, the station and the access point in the embodiment of the present invention can ensure that in a network where there are stations supporting different protocol versions/capabilities, the exchange of short data frames can be sent by selecting an appropriate protocol version/capability to realize Correct setup of network allocation vectors.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a flowchart of a method for transmitting information according to an embodiment of the present invention.

Fig. 2 is a flowchart of a method for transmitting information according to another embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an apparatus for transmitting information according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an apparatus for transmitting information according to another embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

According to the IEEE802.11ac air interface protocol, the NAV is set by means of short data frame exchange. For example, there are stations that transmit information and stations that do not transmit information in the network, where the stations that transmit information are a first station STA1 and a second station STA2, and information is being transmitted between them. Assume that the first station STA1 sends an IEEE802.11ac short data frame Data1 to the second station STA2 (for example, a common station, or an access point), where the short data frame Data1 carries a first duration field. All stations (except the second station STA2 ) that have heard the IEEE802.11ac short data frame Data1 non-transmission information use the duration field carried in the short data frame Data1 to set the network allocation vector NAV. After receiving the IEEE802.11ac short data frame Data1, the second station STA2 needs to feed back an acknowledgment frame ACK1 to the first station STA1, wherein the acknowledgment frame ACK1 carries a second duration field. All stations (except the first station STA1 ) that hear the non-transmission information of the acknowledgment frame ACK1 must use the duration field carried by the acknowledgment frame ACK1 to set the network allocation vector NAV.

In addition, if the first station STA1 has a hidden node STA3, although the hidden node STA3 cannot intercept the information transmitted by the first station STA1, but because the hidden node STA3 can intercept the information transmitted by the second station STA2, it can be based on the information transmitted by the second station STA2. STA2 sends the confirmation frame ACK1 carrying the duration field to set the network allocation vector NAV, so as to know the time length that the shared medium will be occupied, and will not attempt to initiate access to the second station STA2 within the time length indicated by the network allocation vector NAV And send data, so as to avoid the data collision of the shared media network.

The following describes a method for transmitting messages according to an embodiment of the present invention according to FIG. 1 , by transmitting information with a protocol version/capability that can be demodulated to correctly set NAV, so as to avoid data collision problems in a shared media network.

11. Obtain the highest protocol version/capability supported by some or all stations within the coverage area.

Here, the highest protocol version/capability is obtained through inter-site association or data exchange in the network. The coverage of a station includes all stations that can listen to the station. For a station that needs to transmit information, it only needs to obtain the highest protocol version/capability supported by some or all stations within its coverage.

Take the association of stations and access points as an example. A station needs to be associated with an access point to be able to transmit data with the access point. Before the association, the station needs to receive the beacon (Beacon) frame periodically sent by the access point, and the beacon frame carries some basic information of the station and the network where the access point is located, so that the station can associate with the access point. Association establishes a mapping relationship between stations and access points. An association is initiated by the station sending an association request to the access point, and the access point replies with an association response if it receives the association request. During the association process, security authentication is performed between the access point and the station, a safe and reliable communication mechanism is established, and necessary basic information is exchanged. Wherein, the access point obtains the protocol stack supported by the station and the supported features and capabilities, and the access point sends the specific operation parameters required by the station to the station.

It can be understood that during the process of associating a station with an access point or transmitting data with other stations, the highest protocol version/capability supported by some or all stations within its coverage area can be known.

12. Transmit the information carrying the duration field according to the protocol version/capability that is the same as or lower than the first protocol version/capability or the recorded protocol version/capability, wherein the first protocol version/capability is supported by this part of the site within the coverage area The lowest one among the highest protocol versions/capabilities of , so that non-transmitting stations set the network allocation vector according to the duration field.

In order for a station on the network that receives or listens to the message to correctly demodulate the message, the station sending the message needs to use the lowest of all known highest protocol versions/capabilities or lower than the lowest protocol version/capability The protocol version/capability to send this information, so that the station that intercepts the non-transmission information of this information can set the network allocation vector according to the demodulated duration field.

The information may be a data frame Data1 or an acknowledgment frame ACK1. Specifically, when a first station needs to send a data frame Data1 to another station, the first station needs to first determine the lowest protocol version/capability among the highest protocol versions/capabilities supported by stations within the range covered by its signal , and then send the data frame Data1 carrying the first duration field with the lowest protocol version/capability or a lower protocol version/capability. At this time, the station that can hear the data frame Data1, that is, the station that does not send or receive information, will set the network allocation vector according to the first duration field.

After the other station receives the data frame Data1, it needs to send an acknowledgment frame ACK1 to the first station. Therefore, the other station needs to first determine the lowest protocol version/capability among the highest protocol versions/capabilities supported by stations within the range covered by its signal, and then use the lowest protocol version/capability or a lower protocol version/capability The capability sends an acknowledgment frame ACK1 carrying the second duration field. At this time, the stations that can hear the acknowledgment frame ACK1 will set the network allocation vector according to the second duration field. The first station receives the acknowledgment frame ACK1 sent by the other station.

That is to say, whether it is the first site or another site, under the condition of obtaining the highest protocol version/capability supported by some or all sites within its coverage area, the protocol version/capability is the same as or lower than the first protocol version/capability The protocol version/capability transmission carries the information of the duration field, wherein the first protocol version/capability is the lowest one among the highest protocol versions/capabilities supported by some or all stations. That is, the station sends the information carrying the duration field according to the protocol version/capability that is the same as or lower than the first protocol version/capability; or receives the information carrying the duration field.

Optionally, the station may also transmit the information carrying the duration field according to the recorded protocol version/capability, where the recorded protocol version/capability is a fixed configuration or is configured in real time by the network.

The method for transmitting information in the embodiment of the present invention can ensure that in a network where there are stations supporting different protocol versions/capabilities, the correct setting of NAV can be realized by selecting an appropriate protocol version/capability mode to send short data frame exchanges.

The following describes a method for transmitting a message according to another embodiment of the present invention according to FIG. 2 . 21. Listen to the information carrying the duration field, wherein the information is transmitted by the station transmitting the information according to the protocol version/capability that is the same as or lower than the first protocol version/capability or the recorded protocol version/capability, the first protocol version/capability The version/capability is the lowest one among the highest protocol versions/capabilities supported by all or some stations within the coverage of the station transmitting information. 22. Set a network allocation vector according to the duration field.

That is, for a station that does not perform information transmission, when other stations perform information transmission according to a protocol version/capability that is the same as or lower than the first protocol version/capability or a recorded protocol version/capability, the first protocol version /Capability is the lowest one of the highest protocol version/capability supported by some or all stations within the coverage area of the station transmitting the information. This part or all stations intercept the information transmission. If the interception carries the transmission information with the duration field , then set the network allocation vector according to the duration field. Since the network allocation vector is set, some or all of the stations will not initiate access to the station that is transmitting information and send data.

In addition, those of ordinary skill in the art should also understand that the above-mentioned network is not limited to a Basic Service Set (BSS, Basic Service Set) network, an overlapping Basic Service Set (OBSS, overlapping BSS) network and an Extended Service Set (ESS, Extended Service Set) network.

The method and device according to the embodiments of the present invention can be applied between stations, and can also be applied between stations and access points. The access point is a station in itself, the central point in the network for management and control. Generally, in a network where no access points exist, a certain station can exist as a central station for a certain period of time and manage the network.

In a specific embodiment, when there is only one access point and one station in a BSS network, the station sends short data frames to the access point according to the protocol version/capability it supports, and the AP follows the received short data frame If the protocol version/capability of the same or lower data frame returns an acknowledgment frame, the station that hears the acknowledgment frame will set the network allocation vector NAV.

In another specific embodiment, when there is an access point and multiple stations in a BSS network, if all stations support a protocol version/capability, one of the stations will send a short message according to the protocol version/capability The data frame is sent to the access point, and the access point responds with an acknowledgment frame according to the same or lower protocol version/capability as the received short data frame, and the station that detects the acknowledgment frame will set the network allocation vector NAV. Or, one of the stations sends a short data frame to the access point with the lowest protocol version/capability (ie, IEEE802.11a), and the access point also replies with an acknowledgment frame of the lowest protocol version/capability. However, generally speaking, the lower the protocol version/capability to transmit information, the lower the spectrum effect and utilization of the network, so this method is not recommended. Therefore, it would be better to transmit information with the highest protocol version/capability acceptable to all stations.

In yet another specific embodiment, when one of the stations sends a short data frame to the access point with the lowest protocol version/capability (ie, IEEE802.11a), the access point can reply with an acknowledgment according to the recorded protocol version/capability frame. Wherein, the recorded protocol version/capability may be a fixed configuration, or be configured in real time by the network, or be obtained from surrounding stations, or be recorded by recording the process of association or data exchange with surrounding stations.

It should be understood that in the above specific embodiments, the access point may also be replaced by any common station. The foregoing method may be applied between stations, or between a station and an access point.

An apparatus for transmitting information according to an embodiment of the present invention is described below with reference to FIG. 3 and FIG. 4 .

In FIG. 3 , the device 30 for transmitting information includes a version acquiring unit 31 and a transmitting unit 32 . Among them, the obtaining version unit 31 is used to obtain the highest protocol version/capability supported by some or all stations within the coverage area, and the transmission unit 32 is used to follow the same or lower protocol version/capability or record protocol version/capability as the first protocol version/capability The protocol version/capability transmission carries the information of the duration field, wherein the first protocol version/capability is the lowest one among the highest protocol versions/capabilities supported by some or all stations. Wherein, the recorded protocol version/capability is a fixed configuration or a real-time configuration by the network, or is obtained through inter-site association or data exchange. Here, the information transmitted by the apparatus for transmitting information according to the embodiment of the present invention includes a data frame or an acknowledgment frame.

In FIG. 4 , the device 40 for transmitting information includes a listening unit 41 and a setting unit 42 . Specifically, the listening unit 41 is used to listen to the information carrying the duration field, wherein the information is transmitted by the station transmitting the information according to the protocol version/capability that is the same as or lower than the first protocol version/capability or the recorded protocol version/capability For capability transmission, the first protocol version/capability is the lowest one among the highest protocol versions/capabilities supported by some or all stations within the coverage of the station transmitting information. The setting unit 42 is configured to set the network allocation vector according to the duration field.

The device for transmitting information in the embodiment of the present invention can ensure that in a network where there are STAs supporting different protocol versions/capabilities, the correct setting of NAV can be realized by selecting an appropriate protocol version/capability mode to send short data frame exchanges.

It should be understood that the apparatus for transmitting information in this embodiment of the present invention may be a station or an access point.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (14)

1. a method for transmission information, is characterized in that, comprising:

Obtain the highest protocol version/ability that in coverage, whole website is supported, the highest described protocol version/ability is obtained by association between the website in network or exchanges data;

According to the protocol version/ability of the protocol version/ability identical or lower with the first protocol version/ability or record, the information of duration field is carried in transmission, one minimum in the highest protocol version/ability that wherein said first protocol version/ability is supported for described whole website, so that the website of non-transmitting information adopts short data Frame switch mode to arrange network allocation vector according to described duration field.

2. method according to claim 1, is characterized in that, the protocol version/ability of described record is fixed configurations or is configured by during network implementation.

3. method according to claim 1, is characterized in that, the protocol version/ability of described record is obtained by association between website or exchanges data.

4. method according to claim 3, is characterized in that, the protocol version/ability of described record is that to obtain by association between website or exchanges data the protocol version/ability comprising described record be by associate between website with access point or exchanges data acquisition.

5. method according to any one of claim 1 to 4, is characterized in that, described information comprises Frame or acknowledgement frame.

6. a method for transmission information, is characterized in that, comprising:

Intercept the information of carrying duration field, wherein said information by the website of transmission information according to the protocol version/capable transport of the protocol version/ability identical or lower with the first protocol version/ability or record, one minimum in the highest protocol version/ability that in the coverage that described first protocol version/ability is the website of described transmission information, all website is supported;

Adopt short data Frame switch mode that network allocation vector is set according to described duration field.

7. method according to claim 6, is characterized in that, described information comprises Frame or acknowledgement frame.

8. a device for transmission information, is characterized in that, comprising:

Obtain version unit, for obtaining the highest protocol version/ability that in coverage, whole website is supported, the highest described protocol version/ability is obtained by association between the website in network or exchanges data;

Transmission unit, for carrying the information of duration field according to the protocol version/capable transport of protocol version/ability identical or lower with the first protocol version/ability or record, one minimum in the highest protocol version/ability that wherein said first protocol version/ability is supported for described whole website, so that the website of non-transmitting information adopts short data Frame switch mode to arrange network allocation vector according to described duration field.

9. device according to claim 8, is characterized in that, the protocol version/ability of described record is fixed configurations or is configured by during network implementation.

10. device according to claim 8, is characterized in that, the protocol version/ability of described record is obtained by association between website or exchanges data.

11. devices according to claim 10, is characterized in that, the protocol version/ability of described record is that to obtain by association between website or exchanges data the protocol version/ability comprising described record be by associate between website with access point or exchanges data acquisition.

Device according to any one of 12. according to Claim 8 to 11, is characterized in that, described information comprises Frame or acknowledgement frame.

The device of 13. 1 kinds of transmission informations, is characterized in that, comprising:

Intercept unit, for intercepting the information of carrying duration field, wherein said information by the website of transmission information according to the protocol version/capable transport of the protocol version/ability identical or lower with the first protocol version/ability or record, one minimum in the highest protocol version/ability that in the coverage that described first protocol version/ability is the website of described transmission information, all website is supported;

Setting unit, arranges network allocation vector for adopting short data Frame switch mode according to described duration field.

14. devices according to claim 13, is characterized in that, described information comprises Frame or acknowledgement frame.