CN1929638A - Management method for multicast members of wireless LAN IP multicast frame transmission - Google Patents
Management method for multicast members of wireless LAN IP multicast frame transmission Download PDFInfo
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Abstract
This invention relates to one group broadcast member management method of wireless local network IP frame, which comprises the following steps: a, wireless interface device sends group into require message into certain group; b, wireless interface device receives message, judging whether there is wireless customer end, if yes, then adding require customer end to member list; if not, establishing group to add require customer end into member list.
Description
Technical field
The implementation method of IP multicasting technology service application when the present invention relates to wireless local area network building in the field of wireless communication relates in particular to the management method of IEEE 802.11 wireless lan (wlan) multicast members.
Background technology
Because advantages such as the WLAN (wireless local area network) wiring are simple and easy, WLAN (wireless local area network) is widely used in home network gradually.And along with the continuous development of broadband and video compression technology, transmit by wireless local area network technology, can become an important directions of Future Development gradually based on the Web TV of net cast and program request.
Traditional IEEE 802.11 WLAN (wireless local area network) are the data Application Design, and are more weak to the support of multicast application.When WLAN (wireless local area network) was carried out transfer of data, the client that receives data guaranteed reliability of data transmission by 802.11 acknowledgement frames (ACK).If access point apparatus does not receive the ACK frame of client, then can retransmit this frame.Access point apparatus also by 802.11 acknowledgement frames and other management or Frame from client, detects recipient's signal quality, and according to the data transmission rate of signal quality adjustment to client, further guarantees the reliable transmission of data.
But 802.11 agreements regulation, the client of receiving group are not confirmed the correct reception of multicast frame by sending 802.11 acknowledgement frames (ACK), thereby the reliability of muticast data transmission can not get guaranteeing.Because multicast message is all clients that are sent in the multicast group, access point apparatus can both receive multicast frame in order to guarantee all clients, usually send multicast frame with the most conservative speed, as under the 802.11b pattern, being generally 1Mbps, under the 802.11a/g pattern, be generally 2Mbps, but the transmission rate of the actual above-mentioned multicast frame of bandwidth ratio is also low, this is for needing 2Mbps even the more multimedia application such as the IPTV business of high bandwidth at least, bandwidth is obviously not enough, and traffic affecting is normally carried out.If fixed configurations than higher multicast packet transmission rate, can cause some lower wireless client of signal quality correctly not receive, particularly change when the change wireless client that causes and the signal quality between WAP (wireless access point) of environment such as the distance between wireless client and the WAP (wireless access point), barrier, if the multicast transmission rate between WAP (wireless access point) and wireless client can not be adjusted in real time, higher multicast then can occur and send the error rate, cause correctly receiving group message of wireless client.Therefore the transmission rate that needs to increase multicast is to improve bandwidth, and the multicast transmission rate must be supported and can adjust in real time.
In addition, after a multicast message arrival of multicast source transmission WAP (wireless access point), wireless access this multicast message of naming a person for a particular job sends to related wireless client, but other wireless clients that do not belong to this multicast group and be associated with this WAP (wireless access point) also can be received this multicast message.This is unallowed to some wireless application, such as IPTV live broadcast service based on the IP multicast, the wireless client that its requires only to add certain multicast group can receive the multicast message of this multicast group, other wireless clients that do not add this multicast group do not allow to receive the multicast message of this multicast group, and present IEEE802.11 WLAN (wireless local area network) can't meet this requirement.
Summary of the invention
Technical problem to be solved by this invention provides a kind of management method for multicast members of wireless LAN IP multicast frame transmission, can solve the problem of above-mentioned IP multicast message in WLAN (wireless local area network) is used, realization is effectively managed the multiast radio client, improves IP multicast transmission rate and IP multicast transmission reliability simultaneously.
In order to solve the problems of the technologies described above, the invention provides a kind of management method for multicast members of wireless LAN IP multicast frame transmission, each multicast group has multicast member tabulation,
When wireless client requests adds certain IP multicast group, may further comprise the steps:
(a) wireless client sends the multicast message that joins request to radio reception device, and request adds certain multicast group;
(b) after radio reception device is received request message, whether exist according to the multicast multicast group that the destination address of message judges that described wireless client requests adds that joins request, if exist, then judge in the multicast member tabulation of this multicast group whether described requesting client is arranged, if have, then upgrade the ageing timer of the MAC Address of this requesting client, if do not have, then in the multicast member tabulation of this multicast group, add this requesting client, promptly in the multicast member tabulation, write down the MAC Address of described request client, otherwise, newly-built multicast group, and in the multicast member tabulation of this multicast group, add this requesting client;
(c) described radio reception device is transmitted to multicast source with this multicast message that joins request.
When wireless client requests is left certain IP multicast group, may further comprise the steps:
(A) wireless client sends multicast to radio reception device and leaves request message, and certain multicast group is left in request;
(B) after radio reception device is received request message, this requesting client of deletion in the multicast member tabulation of this multicast group.
(C) radio reception device judges whether the tabulation of this multicast member is empty, if, then delete this multicast group, and this multicast is left request message be transmitted to multicast source, otherwise, with this packet loss.
When radio reception device is received the multicast inquiry message that multicast source sends, may further comprise the steps:
Radio reception device is judged the type of this message, if general polling message, then by best broadcasting packet transmission rate this message is sent to each wireless client related with this message, described best broadcasting packet transmission rate is the minimum value of the selection of described radio reception device in the best unicast message transmission rate of all wireless clients; If decide the group polling message, then this multicast message is treated to unicast message, the multicast destination address that is about to this multicast message replaces with the MAC Address of wireless client in the multicast group, send to member's wireless client under this multicast group with best unicast message transmission rate, described best unicast message transmission rate is that described radio reception device is determined according to 802.11 messages of the wireless client that receives.
Further, said method also can have following characteristics: if radio reception device detects the abnormal off-line of wireless client, then search the affiliated multicast group of this wireless client, in the multicast member tabulation of this multicast group, delete described wireless client, promptly delete the MAC Address of described wireless client in multicast member is tabulated, described radio reception device is judged if whether the tabulation of the multicast member of this multicast group is sky, if then delete this multicast group.
Further, said method also can have following characteristics: after deleting described wireless client, the multicast that the wireless access point device simulation produces wireless client leaves request message, sends it to multicast source.
Further, said method also can have following characteristics: described when this multicast message is treated to unicast message, if a plurality of wireless clients are arranged, then every replacement primary address sends once, all sends up to all member's wireless clients in multicast group to finish.
Further, said method also can have following characteristics: after radio reception device restarted, the radio reception device simulation produced the multicast inquiry message that multicast source issues, and arouses wireless client and asks to add multicast group again.
In order to solve in existing WLAN (wireless local area network), WAP (wireless access point) can not limit the IP multicast message and only send to the wireless client that adds this multicast group, the client of receiving group does not confirm that to access point multicast frame receives by sending 802.11 acknowledgement frame ACK, and access point sends multicast frame with fixing and minimum data rate usually, cause the access point can't the detected transmission mistake, can't transmit the packet of losing again, can not adjust the multicast transmission rate and cause the error rate to increase according to the variation of client distance and environment, and multicast transmission does not reach the problem of bandwidth requirement, the invention provides a kind of method that multiast radio client member is effectively managed, realized in wireless lan network, transmitted the IP multicast message at a high speed reliably.IGMP (Internet igmpinternet) message that the present invention sends to WAP (wireless access point) by intercepting wireless client, the tabulation of Dynamic Maintenance multicast member.When multicast source sends the IP multicast message to access point, the multicast member management module is carried out the unicast message processing that the multicast destination address is converted to the wireless client MAC Address by inquiry multicast member tabulation back to multicast message, make the bandwidth of multicast message and bandwidth and the transmission reliability that reliability can reach unicast message, thus the reliability that improves the transmission rate of IP multicast message and improve the transmission of IP multicast message.
Adopt the method for the invention, guaranteed in the WLAN (wireless local area network) product that adopts IEEE 802.11a/b/g standard and wireless standard IEEE 802.11n of future generation, reach the purpose of high speed reliable transmission multicast message, overcome the defective of the low poor reliability of IEEE 802.11 transport multicast message bandwidth, greatly expanded the application of WLAN (wireless local area network) product, particularly, promoted development by the wireless local network transmission group broadcasting service application based on the application of the net cast business of multicasting technology at the WLAN (wireless local area network) product.
Description of drawings
Fig. 1 is the multicast transmission equipment drawing;
Fig. 2 is the multicast transmission system application drawing;
Fig. 3 is the system module figure of multicast transmission scheme;
Fig. 4 is a multicast transmission The Application of Technology exemplary plot;
Fig. 5 is that present embodiment multicast member management resume module wireless client adds the multicast group flow chart;
Fig. 6 leaves the multicast group flow chart for present embodiment multicast member management resume module wireless client.
Embodiment
As shown in Figure 1, the wireless access point device of transport multicast is made up of radio interface module, multicast member management module, upstream Interface module, 802.1d bridge module, IP routing module, protocol application module and Configuration Manager.The message that the radio interface module of equipment receives is forwarded to the upstream Interface module through 802.1d bridge module or IP routing module, and the message that the upstream Interface module receives is forwarded to radio interface module through 802.1d bridge module or IP routing module.Then send by the multicast member management resume module when radio interface module or upstream Interface module receive IGMP (Internet igmpinternet) message or IP multicast message: the multicast member management resume module is safeguarded the multicast member tabulation from the IGMP message that radio interface module receives; The IP multicast message that the upstream Interface module receives further is forwarded to the multicast member management resume module through 802.1d bridge module or IP routing module, by the multicast member management module IP multicast message is forwarded to radio interface module.Wherein:
Radio interface module, comprise wireless driver module and hardware interface, wherein wireless driver module is used to receive and send management of 802.11 between WAP (wireless access point) and wireless client and Frame, and, adjust in real time and definite WAP (wireless access point) sends to " the best unicast message transmission rate " of wireless client according to detecting the signal quality that is connected of WAP (wireless access point) and wireless client in real time with mutual 802.11 frames of wireless client;
The multicast member management module is used to safeguard multicast member tabulation and the mac address information that writes down the multicast member wireless client, also is responsible for the IP multicast message between reception and forwarding multicasting source and multicast member wireless client;
802.1d bridge module and IP routing module are used to E-Packet;
The upstream Interface module, comprise driving and the upstream hardware interface, be used to connect external network, as the interface of Internet, can receive Internet in succession by connecting equipment rooms such as DSLAM, switch, BRAS, described upstream Interface can be interfaces such as Ethernet interface, xDSL interface, xPON;
The protocol application module and the Configuration Manager of equipment are used to finish variety of protocol and upper layer application, and the configuration management of Local or Remote.
Multicast transmission system is used as shown in Figure 2, comprises wireless client, WAP (wireless access point), compartment system (DS) and multicast source in the application system of multicast transmission at least.Wireless client need ask to add or when leaving certain multicast group of multicast source, IGMP (IGMP) message that wireless client sends sends to multicast source through WAP (wireless access point), and the wireless access wireless client of naming a person for a particular job adds or eliminates certain multicast group.When multicast source sent certain IP multicast message to the member of multicast group, the IP multicast message that multicast source sends sent to member's wireless client of multicast group through WAP (wireless access point), finishes the transmission of IP multicast.
Wherein: multicast source is used to send multicast message; Compartment system is used to connect WAP (wireless access point) and multicast source; One or more WAP (wireless access point) are used for determining and select transmission rate that multicast message is sent to wireless client, are used for the IP multicast message is treated to unicast message also, and handle adding that wireless client sends or the solicited message of leaving multicast group; One or more wireless clients are to use the user of multicast service, can send the request that adds or leave multicast group to WAP (wireless access point).
As shown in Figure 3, in the WAP (wireless access point) that realizes the described high speed reliable transmission of this programme IP multicast message, comprise wireless driver module, multicast member management module.In wireless driver module, all preserve a best unicast message transmission rate at each wireless client, when each wireless client newly is linked into WAP (wireless access point), wireless driver module is determined this wireless client " best unicast message transmission rate ", perhaps when " the best unicast message transmission rate " of wireless client when changing in real time, wireless driver module is selected minimum " best unicast message transmission rate " value in all clients, send " the best broadcasting packet transmission rate " of other broadcast group broadcast messages as WAP (wireless access point) to each wireless client, described " best broadcasting packet transmission rate " also can be described as " best multicast message transmission rate ", is the shared speed of all clients.
The multicast member tabulation, member's wireless client client information of record multicast group and multicast group, each multicast group has a multicast member tabulation, by multicast member management module Dynamic Maintenance, can be stored in the multicast member management module, wherein wireless client information comprises the mac address information of wireless client.
In concrete the application as shown in Figure 4.In the WLAN (wireless local area network) product of setting up with IEEE 802.11a/b/g standard and wireless standard IEEE 802.11n of future generation, wireless access point device inserts a plurality of wireless client STA.Wireless client sends the IGMPReport request that joins message of IGMP multicast to WAP (wireless access point) and adds certain IP multicast group, and perhaps wireless client sends IGMP multicast leave message IGMP Leave request to WAP (wireless access point) and leaves certain IP multicast group.The multicast member management module of WAP (wireless access point) adds or leave message from the IGMP multicast that wireless driver module receives wireless client, the information such as MAC (medium access control) address of tabulation of Dynamic Maintenance multicast member and wireless client.
In existing IEEE 802.11a/b/g wireless lan network and wireless standard IEEE802.11n wireless lan network of future generation, the transmission method of IP multicast message comprises: the IP multicast message that sends from multicast source arrives WAP (wireless access point); Multicast member management module in the WAP (wireless access point) is handled it, the tabulation of multicast member management module searches multicast member, if the multicast group of IP multicast message correspondence has the multicast member wireless client to exist in the multicast member tabulation, then the IP multicast message is processed into unicast message, sends to each member's wireless client under the multicast group with best unicast message transmission rate.
Above-mentioned radio reception device is meant the processing that the IP multicast message carries out multicast message commentaries on classics unicast message, the multicast destination address of IP multicast message is replaced with successively the MAC Address of each wireless client in the multicast group, every replacement primary address sends once, all sends up to all member's wireless clients in multicast group to finish.Radio reception device can be determined best unicast message transmission rate according to 802.11 messages of the wireless client that receives.
The transmission rate of message and reliability meet the Performance And Reliability requirement of unicast message like this, have guaranteed based on the reliable application at the WLAN (wireless local area network) product of the net cast business of IP multicasting technology.
To the concrete implementing procedure of multicast member management as shown in Figure 5 and Figure 6, for the ease of multicast member is carried out dynamic management, added the data structure sta_list that multicast member is managed in the multicast member tabulation, mainly comprised: mac, the MAC Address of wireless client; Mac_ageing_timer, wireless client MAC address aging timer.Wireless driver module detects the signal quality of client according to 802.11 management and the Frames that receive from client, adjusts the transmission rate of client, and is responsible for that the IGMP message is transmitted to the multicast member management module and is used to set up dynamic multicast member table.
The flow process that WAP (wireless access point) processing wireless client adds may further comprise the steps as shown in Figure 5:
Whether the destination address that step 120, multicast member management module are judged IGMP Report message i.e. this multicast group exists, if, execution in step 130, otherwise, execution in step 160;
The effect of ageing timer is: if a wireless client abnormal off-line, then WAP (wireless access point) just again can't receive the IGMP Report message (and IGMP Leave message) that this client sends, time-out time to be arrived, think that then this client rolls off the production line, its MAC Address of deletion from the multicast member tabulation.
Multicast adds and multicast inquiry all is an indispensable mechanism in the multicasting technology.Multicast adds by wireless client initiates, and is used to add multicast; And multicast inquiry is initiated by multicast source, be used to inquire about under certain multicast group of this multicast source which client is arranged, multicast source sends multicast inquiry IGMP Qurey message at set intervals, after client is received this query message, can return an IGMP Report message.
The flow process that WAP (wireless access point) is handled the multicast source inquiry comprises:
After the multicast inquiry message (IGMP Query) that sends from multicast source arrives WAP (wireless access point), multicast member management module in the WAP (wireless access point) is judged the type of this IGMP Query message, if IGMP general polling message, then this message is sent to wireless client in each association by best broadcasting packet transmission rate; If IGMP decides the group polling message, then travel through each wireless client member in this message target multicast group, multicast destination address with multicast message is converted to each member's wireless client MAC Address simultaneously, thereby this multicast message is become unicast message, send to each wireless client under this multicast group according to the best unicast message transmission rate of each wireless client.
Radio reception device is selected " best unicast message transmission rate " minimum in all wireless clients, as " the best broadcasting packet transmission rate " of WAP (wireless access point) transmission.
The flow process that WAP (wireless access point) processing wireless client leaves may further comprise the steps as shown in Figure 6:
Step 250 is deleted this multicast group, and this IGMP Leave message is transmitted to corresponding multicast source.
Multicast member management module in WAP (wireless access point) detects the abnormal off-line of wireless client, then travels through under all multicast group the multicast member tabulation, with MAC Address deletion from the multicast member tabulation of the wireless client of abnormal off-line.If the wireless client decreased number under the multicast group is 0 (be member tabulate be sky), then delete this multicast group, because client is an abnormal off-line, can't send IGMP Leave message, therefore the multicast leave message IGMPLeave that produces wireless client by the multicast member management module simulation sends to multicast source, informs that this client of multicast source leaves.
After WAP (wireless access point) restarted, the multicast member management module simulation produced multicast inquiry (IGMP Query) message that multicast source issues, and arouses wireless client and asks to add multicast group again.
Above-mentioned in WLAN (wireless local area network) with IEEE 802.11a/b/g standard and wireless standard IEEE 802.11n of future generation, device of wireless local area network access point is by analyzing the IGMP message, the tabulation of Dynamic Maintenance multicast member, thereby multicast message is carried out the processing that multicast changes unicast message, the reliability that has improved IP multicast message transmission rate and improved the IP multicast transmission by the multicast member tabulation.
This method has overcome the defective of the low poor reliability of IEEE 802.11 transmission IP multicast message bandwidth, greatly expanded the application of WLAN (wireless local area network) product, particularly based on the application of the net cast business of IP multicasting technology, for the WLAN (wireless local area network) product provides strong assurance popularizing with development of home network at the WLAN (wireless local area network) product.
Claims (5)
1, a kind of management method for multicast members of wireless LAN IP multicast frame transmission, each multicast group has multicast member tabulation,
When wireless client requests adds certain IP multicast group, may further comprise the steps:
(a) wireless client sends the multicast message that joins request to radio reception device, and request adds certain multicast group;
(b) after radio reception device is received request message, whether exist according to the multicast multicast group that the destination address of message judges that described wireless client requests adds that joins request, if exist, then judge in the multicast member tabulation of this multicast group whether described requesting client is arranged, if have, then upgrade the ageing timer of the MAC Address of this requesting client, if do not have, then in the multicast member tabulation of this multicast group, add this requesting client, promptly in the multicast member tabulation, write down the MAC Address of described request client, otherwise, newly-built multicast group, and in the multicast member tabulation of this multicast group, add this requesting client;
(c) described radio reception device is transmitted to multicast source with this multicast message that joins request.
When wireless client requests is left certain IP multicast group, may further comprise the steps:
(A) wireless client sends multicast to radio reception device and leaves request message, and certain multicast group is left in request;
(B) after radio reception device is received request message, this requesting client of deletion in the multicast member tabulation of this multicast group.
(C) radio reception device judges whether the tabulation of this multicast member is empty, if, then delete this multicast group, and this multicast is left request message be transmitted to multicast source, otherwise, with this packet loss.
When radio reception device is received the multicast inquiry message that multicast source sends, may further comprise the steps:
Radio reception device is judged the type of this message, if general polling message, then by best broadcasting packet transmission rate this message is sent to each wireless client related with this message, described best broadcasting packet transmission rate is the minimum value of the selection of described radio reception device in the best unicast message transmission rate of all wireless clients; If decide the group polling message, then this multicast message is treated to unicast message, the multicast destination address that is about to this multicast message replaces with the MAC Address of wireless client in the multicast group, send to member's wireless client under this multicast group with best unicast message transmission rate, described best unicast message transmission rate is that described radio reception device is determined according to 802.11 messages of the wireless client that receives.
2, the method for claim 1, it is characterized in that, if radio reception device detects the abnormal off-line of wireless client, then search the affiliated multicast group of this wireless client, in the multicast member tabulation of this multicast group, delete described wireless client, promptly in tabulating, deletes multicast member the MAC Address of described wireless client, described radio reception device is judged if whether the tabulation of the multicast member of this multicast group is empty, if then delete this multicast group.
3, method as claimed in claim 2 is characterized in that, delete described wireless client after, the multicast that wireless access point device simulation produces wireless client leaves request message, sends it to multicast source.
4, the method for claim 1, it is characterized in that, described when this multicast message is treated to unicast message, if a plurality of wireless clients are arranged, then every replacement primary address sends once, all sends up to all member's wireless clients in multicast group to finish.
5, the method for claim 1 is characterized in that, after radio reception device restarted, the radio reception device simulation produced the multicast inquiry message that multicast source issues, and arouses wireless client and asks to add multicast group again.
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| WO2013177959A1 (en) * | 2012-06-01 | 2013-12-05 | 华为技术有限公司 | Transmission method, apparatus, and system for receiving mobile network multicast data |
| CN103458370A (en) * | 2012-06-01 | 2013-12-18 | 华为技术有限公司 | Transmission method, device and system for receiving mobile network multicast data |
| CN103458370B (en) * | 2012-06-01 | 2017-06-16 | 华为技术有限公司 | Receive transmission method, the apparatus and system of mobile network's multicast packet |
| CN102752197A (en) * | 2012-06-25 | 2012-10-24 | 浙江宇视科技有限公司 | Method for simulating IGMP (internet group management protocol) finder and switch |
| CN105472568A (en) * | 2014-07-18 | 2016-04-06 | 华为技术有限公司 | Wireless multicast access method, gateway and access point |
| CN105472568B (en) * | 2014-07-18 | 2019-02-01 | 华为技术有限公司 | A kind of wireless multicast cut-in method and gateway, access point |
| WO2019104857A1 (en) * | 2017-11-29 | 2019-06-06 | 华为技术有限公司 | Message multicast and message broadcast method and device |
| CN109743250A (en) * | 2018-12-07 | 2019-05-10 | 华为技术有限公司 | Transmission method, first network equipment and second network equipment of multicast message |
| CN109743250B (en) * | 2018-12-07 | 2020-09-04 | 华为技术有限公司 | Transmission method of multicast message, first network equipment and second network equipment |
| WO2024088173A1 (en) * | 2022-10-24 | 2024-05-02 | 华为技术有限公司 | Multicast communication method and related apparatus |
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