WO2014206104A1 - Procédé de communication en liaison directe et dispositif et système associés - Google Patents

Procédé de communication en liaison directe et dispositif et système associés Download PDF

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Publication number
WO2014206104A1
WO2014206104A1 PCT/CN2014/072457 CN2014072457W WO2014206104A1 WO 2014206104 A1 WO2014206104 A1 WO 2014206104A1 CN 2014072457 W CN2014072457 W CN 2014072457W WO 2014206104 A1 WO2014206104 A1 WO 2014206104A1
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WO
WIPO (PCT)
Prior art keywords
access point
station
site
direct link
identifier
Prior art date
Application number
PCT/CN2014/072457
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English (en)
Chinese (zh)
Inventor
李云波
Original Assignee
华为技术有限公司
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Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2014206104A1 publication Critical patent/WO2014206104A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a direct link communication method and related device and system.
  • a station In a wireless local area network, a station (STA) usually communicates with other stations or networks through an access point (AP), even if communication between two sites within the same basic service set (BSS) is required. Forwarding through the access point, that is, the sending station first sends the data to the access point, and then the access point forwards the data to the receiving site.
  • BSS basic service set
  • a Direct-Link Setu (DLS) mechanism is introduced.
  • DLS Direct-Link Setu
  • the embodiment of the invention discloses a direct link communication method and related device, and provides a mechanism for establishing a direct link communication, so that the access point and only one site support the DLS function, and the Direct link communication between the site and another site that does not support DLS functionality.
  • a first aspect of the embodiments of the present invention discloses a direct link communication method, including:
  • the first station sends a direct link establishment request frame to the access point, where the first station supports the direct link Road establishment function;
  • the first station encapsulates the first station into an access point according to the indication information, and performs direct link communication with the second station.
  • the method further includes: the first station receiving a transmission key of the second station sent by the access point; A station encrypts the data frame by using the transmission key of the second station to obtain an encrypted data frame;
  • the first station transmits the encrypted data frame to the second site through the direct link.
  • the method further includes:
  • the first station sends a direct link setup confirmation frame to the access point.
  • the direct link establishment request frame further includes an identifier of the second station.
  • a fourth possible implementation manner of the first aspect of the embodiment of the present invention, in combination with the first aspect of the first embodiment of the present invention or the possible implementation manner of any one of the first to the third includes:
  • the first station sets, according to the indication information, a sending address configured by the first site to an identifier of the access point, and sets a receiving address of the first site configuration to the second An identifier of the site to enable the first site to be encapsulated into an access point and to perform direct link communication with the second site.
  • the identifier of the access point includes the access a basic service set identifier BSSID used by the point or a media access control MAC address of the access point, the identifier of the second site including a MAC address of the second site or an associated identifier of the second site AID.
  • the method further includes:
  • the first station sets, according to the indication information, a data frame transmission direction that is configured by the first station to be transmitted by the station to the access point to be a data frame transmission direction that is transmitted by the access point to the station.
  • a second aspect of the embodiment of the present invention discloses a site, where the site supports a direct link establishment function, and the site includes:
  • a first transceiver unit configured to send a direct link setup request frame to the access point, and receive a direct link setup response frame sent by the access point, where the direct link setup response frame includes The site is encapsulated into indication information of an access point;
  • the second transceiver unit is configured to encapsulate the site into an access point according to the indication information received by the first transceiver unit, and perform direct link communication with the second station.
  • the site further includes a power density unit, where:
  • the first transceiver unit is further configured to receive a transmission key of the second station sent by the access point;
  • the encryption unit is configured to perform encryption processing on the data frame by using a transmission key of the second station to obtain an encrypted data frame.
  • the second transceiver unit is further configured to transmit the encrypted data frame to the second station by using the direct link.
  • the first transceiver unit is further configured to send a direct link setup confirmation frame to the access point after receiving the direct link setup response frame sent by the access point.
  • the direct link is established.
  • the request frame also includes an identifier of the second site.
  • the second transceiver unit is configured to set, according to the indication information, a sending address configured by the station to an identifier of the access point, and set a receiving address configured by the station to the second
  • the identifier of the site to encapsulate the site as an access point and to communicate directly with the second site.
  • the identifier of the access point includes the access point a basic service set identifier BSSID used or a media access control MAC address of the access point, the identifier of the second site including a MAC address of the second site or an associated identifier AID of the second site .
  • the second transceiver unit is further configured to use the indication information
  • the data frame transmission direction configured by the station to be transmitted to the access point by the station is set to the data frame transmission direction transmitted by the access point to the station.
  • a third aspect of the embodiments of the present invention discloses a direct link communication system, including:
  • a first station configured to send a direct link establishment request frame to the access point, where the first station supports a direct link establishment function, and receives a direct link setup response frame sent by the access point, where
  • the direct link setup response frame includes indication information for indicating that the first station is encapsulated into an access point; and, according to the indication information, encapsulating the first site into an access point, and the second site Perform direct link communication;
  • the access point is configured to receive the direct link setup request frame sent by the first station, and send the direct link setup response frame to the first station.
  • the first station is further configured to receive a transmission key of the second site sent by the access point, And encrypting the data frame by using the transmission key of the second site to obtain an encrypted data frame; and transmitting the encrypted data frame to the second station by using the direct link;
  • the access point is further configured to send a transmission key of the second site to the first site.
  • the first station is further configured to send a direct link establishment confirmation frame to the access point, where the access point is further configured to receive the direct link establishment confirmation frame sent by the first station.
  • the direct link establishment request frame further includes an identifier of the second station.
  • a fourth possible implementation manner of the third aspect of the embodiment of the present invention, in combination with the third aspect of the embodiment of the present invention or the possible implementation manner of any one of the first to the third aspect of the third aspect of the present invention includes:
  • the first station is configured to set, according to the indication information, a sending address configured by the first site as an identifier of the access point, and set a receiving address configured by the first site as a An identifier of the second site is implemented to encapsulate the first site into an access point and perform direct link communication with the second site.
  • the identifier of the access point includes the access point a basic service set identifier BSSID used or a media access control MAC address of the access point, the identifier of the second site including a MAC address of the second site or an associated identifier AID of the second site .
  • the first station is further configured to use, according to the indication information,
  • the data frame transmission direction of the first station configuration transmitted by the station to the access point is set to the data frame transmission direction transmitted by the access point to the station.
  • a seventh possible implementation manner of the third aspect when the access point and the first station use different identifiers, if the access point receives the receiving address, the access point is used by the access point. And the data frame of the identifier, the access point receives the data frame; if the data frame of the identifier used by the first station is received, the data frame is discarded;
  • the access point When the access point and the first station use the same identifier, if the access point receives a data frame whose received address is an identifier used by the access point, the access point determines a sending address and a destination address of the data frame, if the sending address is an identifier of the second station, and the target address is an identifier of the first station, the access point discards the data frame Otherwise, the data frame is received.
  • the first station may receive the direct link setup response frame sent by the access point, where
  • the direct link establishment response frame includes indication information for indicating that the first station is encapsulated into an access point; thus, the first station may encapsulate the first site into an access point and perform direct connection with the second site according to the indication information.
  • Link communication It can be seen that, by implementing the embodiments of the present invention, a mechanism for establishing direct link communication can be provided, so that the site and another site that does not support the DLS function can be established on the basis that the access point and only one site support the DLS function. Direct link communication between. DRAWINGS
  • FIG. 1 is a flowchart of a direct link communication method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of another direct link communication method according to an embodiment of the present invention
  • FIG. 3 is a structural diagram of a station according to an embodiment of the present invention
  • FIG. 4 is a structural diagram of another station disclosed in an embodiment of the present invention
  • FIG. 5 is a structural diagram of a direct link communication system according to an embodiment of the present invention. detailed description
  • the embodiment of the invention discloses a direct link communication method and related device and system, and provides a mechanism for establishing a direct link communication, so that the access point and only one site support the DLS function, Establish direct link communication between the site and another site that does not support DLS. The details are described below separately.
  • FIG. 1 is a flowchart of a direct link communication method according to an embodiment of the present invention. As shown in FIG. 1, the direct link communication method may include the following steps.
  • the first station sends a direct link establishment request frame to the access point, where the first station supports the DLS function.
  • the direct link establishment request frame may include an identifier of the second station.
  • the first station when the first station determines that the direct link communication is suitable between the second station and the second station (for example, the first station determines that the second station is very close to the second station), the first station may access the network.
  • the point transmits a direct link setup request frame including the flag of the second station.
  • the identifier of the second site may be the MAC address of the second site, or may be the Association Identifier (AID) of the second site, which is not limited in the embodiment of the present invention.
  • the first station receives a direct link setup response frame sent by the access point, where the direct link setup response frame includes indication information used to indicate that the first station is encapsulated into an access point.
  • the direct link establishment response frame may be that the access point identifies that the second station does not support the DLS function and sends the response to the first station according to the identifier of the second station.
  • the access point may query the second site according to the identifier of the second site. Whether the second station supports the DLS function, if it is recognized that the second station does not support the DLS function, the access point may send a direct link setup response frame including indication information indicating that the first station is encapsulated into an access point to the first station. .
  • the access point may also store a matching relationship between the identifier of the second site and the description information for describing whether the second site supports the DLS function, so that when the access point is based on the identifier of the second site
  • the access point may send a direct link setup response including indication information indicating that the first station is encapsulated into an access point. Frame to the first site.
  • the first station encapsulates the first site into an access point according to the indication information, and performs direct link communication with the second site.
  • the first station in step 103, according to the indication information, encapsulating the first site as an access point may include:
  • the first station sets the sending address configured by the first station from the MAC address of the first station to the identifier of the access point according to the indication information, and sets the receiving address configured by the first station by the identifier of the access point.
  • the identifier is set to the identifier of the second site to enable the first site to be encapsulated into an access point.
  • the identifier of the access point includes a basic service set identifier (BSSID) used by the access point or a media access control (MAC) address of the access point.
  • BSSID basic service set identifier
  • MAC media access control
  • the first station encapsulates the first site into an access point according to the indication information, and may further include the following steps:
  • the first station sets the data frame transmission direction of the first station configuration transmitted by the station to the access point as the data frame transmission direction transmitted by the access point to the station.
  • the data frame transmission direction may be represented by values of two identifiers, To DS and From DS.
  • the first station in step 103, according to the indication information, encapsulating the first site into an access point may include:
  • the first station sets, according to the indication information, a data frame transmission direction that is configured by the first station to be transmitted by the station to the access point, and a data frame transmission direction that is transmitted by the access point to the station; and sending the first station configuration
  • the address is set by the MAC address of the first site to the BSSID used by the access point
  • the receiving address configured by the first site is set by the BSSID used by the access point to the MAC address of the second site, so as to implement the first site encapsulation.
  • the first station in step 103, according to the indication information, encapsulating the first site as an access point may include:
  • the first station sets, according to the indication information, a data frame transmission direction that is configured by the first station to be transmitted by the station to the access point, and a data frame transmission direction that is transmitted by the access point to the station; and sending the first station configuration
  • the address is set by the MAC address of the first site as the MAC address of the access point
  • the receiving address configured by the first site is set by the MAC address of the access point to the MAC address of the second site, so as to implement the first site encapsulation.
  • FIG. 2 is a flowchart of a direct link communication method according to an embodiment of the present invention.
  • the embodiment of the present invention provides a mechanism for establishing direct link communication, so that the access point and only one site support the DLS function, and the site can be made. Direct link communication with another site that does not support DLS.
  • one of the stations is configured to communicate with another station by being encapsulated into an AP, and the sending and receiving manner of the other station does not change due to the use of the direct link, so here
  • the direct link communication method disclosed in the embodiment of the present invention may also be referred to as encapsulated direct link establishment.
  • EDLS Encapsulated direct-link setup
  • the embodiment of the present invention may perform the association between the EDLS site and the access point before performing the direct link communication method shown in FIG. 2.
  • the access point may be in the beacon frame function, so that the EDLS station can know that the access point can establish a direct link establishment.
  • the EDLS site can indicate to the access point that it supports the EDLS function in the Probe Request or Association Request, and the target site does not need to make any changes during the association process.
  • the direct link communication method may include the following steps:
  • the EDLS station sends an EDLS setup request frame to the access point, where the EDLS setup request frame includes a flag of the target site.
  • the EDLS station may send an EDLS setup request frame to the access point.
  • the EDLS setup request frame includes the target site. Identifier.
  • the EDLS setup response frame includes indication information used to indicate that the EDLS site is encapsulated into an access point.
  • the EDLS site if the access point does not agree to establish the direct link after receiving the EDLS establishment request frame sent by the EDLS station, the EDLS site cannot indicate that the EDLS site fails to respond or indicates that the establishment fails.
  • the direct link communicates with the target site.
  • the EDLS station sends an EDLS setup confirmation frame to the access point.
  • step 203 is an optional step, and the step 203 is indicated by a dotted line.
  • the EDLS site encapsulates the EDLS site into an access point according to the indication information, and the target The station performs direct link communication.
  • the EDLS site encapsulates the EDLS site into an access point by modifying some relevant parameters of the EDLS site.
  • the parameters to be modified include To DS, From DS, sending address and receiving address.
  • To DS and From DS are set to 1 and 0, respectively, indicating that the data frame is sent by the station to the access point, and in the embodiment of the present invention, To DS and From DS are respectively set to 0 and 1.
  • the data frame to be sent by the EDLS site to the target site is virtualized and sent to the site by the access point.
  • the sending address and the receiving address are respectively the MAC address of the EDLS site and the BSSID (or the MAC address of the access point) used by the access point, usually The BSSID used by the access point is the MAC address of the access point. Therefore, in the embodiment of the present invention, the EDLS site encapsulates itself into an access point and directly sends the data to the target site, so the sending address and the receiving address of the EDLS site are respectively set to the BSSID (or access point) used by the access point. MAC address) and the MAC address of the target site.
  • the source and destination addresses of the EDLS site do not need to be changed.
  • the relevant parameter settings for the target site do not need to be changed.
  • the relevant parameter settings of the target site do not need to be changed, and the related parameter settings of the target site are as shown in Table 2.
  • the EDLS station may directly send the data frame to the target site, and after receiving the data frame, the target site will treat it as being sent by the access point, and the docking The ingress responds and the EDLS site receives the reply directly.
  • the target station sends a data frame with the MAC address of the EDLS site to the access point
  • the EDLS site will directly receive the data frame and reply to the target site using the direct link.
  • the access point may also send the transmission key of the target site to the EDLS site, so that the EDLS site may encrypt the data frame by using the transmission key of the target site to obtain an encrypted data frame, and further, the EDLS site
  • the encrypted data frame can be transmitted to the target site through the direct link.
  • the access point and the EDLS site use different identifiers, if the access point receives the data frame whose identifier is the identifier used by the access point, it can receive it. If a data frame is received that receives an identifier that is used by the EDLS site, It is discarded.
  • the access point and the EDLS site use the same identifier
  • the access point when the access point receives the data frame whose received address is the identifier used, it needs to determine the sending address of the data frame. And the target address. If the sending address is the identifier of the target site, and the destination address is
  • the identifier of the EDLS site can be discarded. Otherwise, you need to receive the data frame.
  • the identifiers of the foregoing EDLS sites and access points may be, but are not limited to, BSSIDs and MAC addresses, and the identifiers of the target sites may be, but are not limited to, MAC addresses and AIDs.
  • FIG. 3 is a structural diagram of a station according to an embodiment of the present invention. Among them, the site shown in Figure 3 supports the DLS function, and the site 300 includes:
  • the first transceiver unit 301 is configured to send a direct link setup request frame to the access point, and receive a direct link setup response frame sent by the access point, where the direct link setup response frame includes Encapsulation information encapsulated into an access point;
  • the second transceiver unit 302 is configured to encapsulate the station into an access point according to the indication information, and perform direct link communication with the second station.
  • the station 300 shown in FIG. 3 further includes an encryption unit 303, where: the first transceiver unit 301 is further configured to receive a transmission key of the second station sent by the access point; and the encryption unit 303 is configured to: Encrypting the data frame by using the transmission key of the second site to obtain an encrypted data frame;
  • the second transceiver unit 302 is configured to transmit the encrypted data frame to the second station by using a direct link.
  • the first transceiver unit 301 is further configured to: after receiving the direct link establishment response frame sent by the access point, send a direct link setup confirmation frame to the access point.
  • the direct link establishment request frame further includes an identifier of the second station.
  • the second transceiver unit 302 is specifically configured to: set the sending address configured by the site as an identifier of the access point according to the indication information, and set the receiving address configured by the site to the identifier of the second site. To implement the encapsulation of the site as an access point and to communicate directly with the second site.
  • the identifier of the access point includes a BSSID used by the access point or a MAC address of the access point.
  • the identifier of the second site includes the MAC address of the second site or the associated identifier AID of the second site.
  • the second transceiver unit 302 is further configured to set, according to the indication information, a data frame transmission direction that is configured by the station to be transmitted by the station to the access point, and a data frame transmission direction that is transmitted by the access point to the station. .
  • the second transceiver unit 302 may set, according to the indication information, a data frame transmission direction that is configured by the station to be transmitted by the station to the access point to be a data frame transmission direction transmitted by the access point to the station; and,
  • the sending address configured by the site is set to the MAC address of the access point by the MAC address of the site, and the receiving address configured by the site is set by the MAC address of the access point to the MAC address of the second site, so as to implement the The site is encapsulated into an access point and communicates directly with the second site.
  • the second transceiver unit 302 can set, according to the indication information, a data frame transmission direction that is configured by the station to be transmitted by the station to the access point to be a data frame transmission direction that is transmitted by the access point to the station;
  • the sending address configured by the site is set by the MAC address of the site to the BSSID used by the access point, and the receiving address configured by the site is set by the BSSID used by the access point to the MAC address of the second site, so as to implement
  • the site is encapsulated into an access point and communicates directly with the second site.
  • FIG. 4 is a structural diagram of another station according to an embodiment of the present invention, for performing a direct link establishment method disclosed in an embodiment of the present invention.
  • the site 400 includes: at least one processor 401, such as a CPU, at least one network interface 404 or other user interface 403, a memory 405, and at least one communication bus 402.
  • Communication bus 402 is used to implement connection communication between these components.
  • the user interface 403 can optionally include a USB interface and other standard interfaces and wired interfaces.
  • Network interface 404 can optionally include a Wi-Fi interface as well as other wireless interfaces.
  • the memory 405 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory.
  • the memory 405 can optionally include at least one storage device located remotely from the aforementioned processor 401.
  • the memory 405 is used to store a program. .
  • the processor 401 is configured to invoke a program stored in the memory 405 to perform the following operations:
  • the point sends a direct link establishment request frame to the access point, and the station supports the DLS function;
  • the direct link setup response frame includes indication information for indicating that the site is encapsulated into an access point
  • the station is encapsulated into an access point, and direct link communication is performed with the second station.
  • the processor 401 also performs the following operations:
  • the data frame is encrypted by using the transmission key of the second site to obtain an encrypted data frame; and the encrypted data frame is transmitted to the second station through the direct link.
  • the processor 401 encapsulates the station into an access point according to the indication information, and establishes a direct link with the second station, including:
  • the processor 401 sets, according to the indication information, a data frame transmission direction that is configured by the station to be transmitted by the station to the access point to be a data frame transmission direction that is transmitted by the access point to the station; and, the sending address configured by the station is configured by
  • the site's MAC address is set to the access point's identifier (including the access point The BSSID used or the MAC address of the access point), and the receiving address configured for the site is set by the access point identifier (including the BSSID used by the access point or the MAC address of the access point) to the second site.
  • An identifier (including the MAC address of the second site or the AID of the second site) to encapsulate the site as an access point and establish a direct link with the second site.
  • FIG. 5 is a structural diagram of another direct link establishment system according to an embodiment of the present invention, for performing a direct link establishment method disclosed in an embodiment of the present invention. As shown in FIG. 5, the system includes a first site 501, an access point 502, and a second site 503, where:
  • the first station 501 is configured to send a direct link establishment request frame to the access point 502, where the first station 501 supports the direct link establishment function, and receives the direct link setup response frame sent by the access point 502.
  • the link setup response frame includes indication information for indicating that the first site 501 is encapsulated into an access point; and, according to the indication information, the first site 501 is encapsulated into an access point, and the direct link is performed with the second site 503.
  • the access point 502 is configured to receive a direct link setup request frame sent by the first station 501, and send a direct link setup response frame to the first site 501.
  • the first station 501 is further configured to receive the transmission key of the second station 503 sent by the access point 502, and encrypt the data frame by using the transmission key of the second station 503 to obtain an encrypted data frame. And transmitting the encrypted data frame to the second station 503 through the direct link;
  • the access point 502 is further configured to send the transmission key of the second site 503 to the first site 501.
  • the first station 501 is further configured to send a direct link establishment confirmation frame to the access point.
  • the access point 502 is further configured to receive a direct link establishment confirmation frame sent by the first station 501.
  • the direct link establishment request frame further includes an identifier of the second station 503.
  • the first station 501 encapsulates the first site 501 according to the indication information. Incoming, and performing direct link communication with the second site 503 includes:
  • the first station 501 is configured to set, according to the indication information, the sending address configured by the first station 501 from the MAC address of the first station 501 to an identifier of the access point 502 (including the BSSID or access point used by the access point 502).
  • the MAC address of 502), and the receiving address configured by the first station 501 is set by the identifier of the access point 502 (including the BSSID used by the access point 502 or the MAC address of the access point 502) to the second site 503.
  • the identifier (including the MAC address of the second site 503 or the AID of the second site 503) is implemented to encapsulate the first site 501 into an access point and perform direct link communication with the second site 503.
  • the identifier of the access point 502 includes the BSSID used by the access point 502 or the MAC address of the access point 502.
  • the first station 501 is further configured to set, according to the indication information, a data frame transmission direction that is configured by the first station 501 and transmitted by the station to the access point to be a data frame transmission direction that is transmitted by the access point to the station. .
  • the access point 502 and the first station 501 use different identifiers, if the access point 502 receives the data frame whose identifier is the identifier used by the access point 502, the access point 502 Receiving a data frame; if receiving a data frame whose received address is an identifier used by the first station 501, discarding the data frame;
  • the access point 502 determines the sending address of the data frame and Target address, if the sending address is the MAC address of the second station 503, and the target address is the MAC address of the first station 501, the access point 502 discards the data frame, otherwise, the data frame is received.
  • a mechanism for establishing direct link communication can be provided, so that the access point and only one site support the DLS function, and the site can be established with another DLS not supported. Direct link communication between functional sites.
  • a person of ordinary skill in the art may understand that all or part of the steps of the foregoing embodiments may be performed by a program to instruct related hardware.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, read-only memory (Read-Only Memory, ROM), Random Access Memory (RAM), disk or CD.
  • Flash disk read-only memory
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • CD Compact Disc
  • the method for establishing a direct link and the related device and system disclosed in the embodiments of the present invention are described above. The description of the above embodiments is only for helping to understand the method and core idea of the present invention. Meanwhile, the general technology in the field In the following, the description of the present invention is not limited to the scope of the present invention.

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Abstract

L'invention concerne un procédé de communication en liaison directe et un dispositif et un système associés. Le procédé comprend les étapes dans lesquelles : une première station prenant en charge une fonction de configuration de liaison directe envoie une trame de requête de configuration de liaison directe à un point d'accès, et la première station reçoit une trame de réponse de configuration de liaison directe envoyée par le point d'accès, la trame de réponse de configuration de liaison directe comprenant des informations d'indication utilisées pour indiquer une encapsulation de la première station dans le point d'accès ; la première station encapsule la première station dans le point d'accès d'après les informations d'indication et réalise une communication en liaison directe avec une seconde station. Par mise en œuvre du mode de réalisation de la présente invention, un mécanisme de configuration pour une communication en liaison directe peut être fourni, de telle sorte que sur la base du fait qu'un point d'accès et uniquement une station prennent en charge une fonction DLS, une communication en liaison directe peut être mise en place entre la station et une autre station qui ne prend pas en charge une fonction DLS.
PCT/CN2014/072457 2013-06-28 2014-02-24 Procédé de communication en liaison directe et dispositif et système associés WO2014206104A1 (fr)

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CN201310268560.0 2013-06-28
CN201310268560.0A CN104254062B (zh) 2013-06-28 2013-06-28 一种直连链路通信方法及相关设备、系统

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