CN102792709B - For method and the equipment thereof of mobile multicast - Google Patents
For method and the equipment thereof of mobile multicast Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/64—Addressing
- H04N21/6405—Multicasting
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides the method for mobile multicast and equipment thereof.The method comprises the request that mobile terminal receive associates again; Multicast service is used at mobile terminal, and the target access providing the current access point of service and mobile terminal to be again associated with for mobile terminal in same Robust Secure Network related network time, produce the multicast context block of information as the information block be described the multicast service of mobile terminal; And send multicast context block of information to target access, can target access be switched to make the multicast service of mobile terminal.By the technical scheme that the embodiment of the present invention proposes, mobile multicasting service can be supported in a wireless local area network.
Description
Technical field
The present invention relates to multicast field, particularly, relate to the method for mobile multicast and equipment thereof.
Background technology
Along with popularizing fast of WiFi terminal equipment, WiFi network develops rapidly.Particularly in China, such as, telecom operators are planning in a lot of city or are building numerous Wi-Fi hotspot and hot-zone, provide WiFi to a certain degree to cover, provide network insertion service to WiFi subscribed users.For the telecom operators of China, build the elementary tactics that large-scale WiFi/WLAN network becomes them.After network infrastructure has been built, what next step was the most important and urgent provides rich and varied value-added service to user, to attract more WiFi user on these large-scale WiFi/WLAN networks.
Telecom operators transmit IPTV service and have good experience and basis on conventional wired networks, and by WiFi network, traditional IPTV service can be pushed on WiFi subscriber equipment, so become the Killer application of WiFi based on the Mobile IP TV of WiFi.But, when traditional IPTV service being pushed from cable network to wireless WiFi user, there are some technical problems.Multicast is the fundamental mechanism realizing IPTV, but at the beginning of design, multicast does not just consider the support to user mobility.When the IPTV service based on multicast is shipped in the WiFi equipment of mobile subscriber, can come up against a series of problems.
Therefore, be necessary for WiFi network, particularly the WiFi network of operator designs a kind of mobile multicast solution, will consider especially in conjunction with existing IEEE802.11 mobile support mechanism.
Consider feasibility and the practicality of mobile multicast solution, concerning the real network demand of extensive WiFi/WLAN network, the various mobile multicast solutions proposed so far also exist various problem.
1, have now and much study for mobile multicast and wireless multicast, but there is a lot of problem in schemes of these researchs.Main defect is the mechanism of these mobile multicasts is depend on mobile-IPv6 (MIPv6) and mobile-IPv4 (MIPv4).Secondly, some other research then more pays close attention to Multicast Routing.In these schemes, the close coupling requirement of mobile multicast and Mobile IP (MIP) and specific routing mechanism, significantly limit mobile multicast and applies in real network environment.During actual deployment Mobile IP TV, find that current solution can not adapt to the actual demand of WiFi network.The simplest example is, if mobile multicast does not relate to the change of three layers of IP address, the mobile multicast mechanism based on MIP can not work usually.Therefore, for mobile multicast mechanism, extensibility and practical feasibility are necessary.
2, people (Design and Analysis of Cooperative Mobile MulticastProtocol (CMMP) for Intermittent Network Connectivity such as Kai-Wen Cheng, IEEE Transactions on WirelessCommunications, Vol.8No.6,2009.) devise a kind of mobile multicast protocol.But this agreement needs the complexity theory carrying out communication for coordination between wireless channel and network element, is also in theoretical research stage, in real network is disposed, lack feasibility.
3, in IEEE802.11 protocol suite, IEEE802.11r and IEEE802.11f is the mobile mechanism of carrying out switching between WiFi access point of two kinds of supports mobile terminal (MS) provided.But IEEE802.11r and IEEE802.11f does not support mobile multicast, which prevent the actual deployment of these IEEE802.11 agreements.
Thus need a kind of method for mobile multicast and equipment thereof, make it possible to support mobile multicasting service in a wireless local area network.
Summary of the invention
Embodiments of the invention propose a kind of method for mobile multicast and equipment thereof, to support mobile multicasting service in a wireless local area network.
According to an aspect of the present invention, propose a kind of method for mobile multicast, comprising: the request that mobile terminal receive associates again; Multicast service is used at described mobile terminal, and the target access providing the current access point of service and described mobile terminal to be again associated with for described mobile terminal in same Robust Secure Network related network time, produce the multicast context block of information as the information block be described the multicast service of described mobile terminal; And described multicast context block of information is sent to described target access, described target access can be switched to make the multicast service of described mobile terminal.
According to a further aspect in the invention, propose a kind of method of mobile multicast, comprise: from for described mobile terminal provides the current access point receiving group contextual information block of service, described multicast context block of information is the information block be described the multicast service of described mobile terminal; Judge whether according to extracted information the multicast group that there is described mobile terminal place, if there is no, send IGMP (IGMP) to multicast agent and add message; And carry out multicast operation according to the feedback result of described multicast agent, so that the multicast service of described mobile terminal is switched to described target access.
According to another aspect of the invention, propose a kind of method adding multicast group, comprising: the target access reception IGMP that will again be associated with from mobile terminal adds message; Message is added according to described IGMP, for described target access creates the multicast group at described mobile terminal place, and create result to described target access feedback, the multicast service of described mobile terminal can be switched to described target access to make described target access.
According to another aspect of the invention, propose a kind of multicast context transmission method, comprising: generate the information block that the multicast service provided for mobile terminal is described; Described information block is sent to other access point except the access point of described multicast service is provided, can seamlessly transfers to other access point described to provide to make described multicast service.
According to another aspect of the invention, propose a kind of access point, comprising: access point Transmit-Receive Unit, for the request that mobile terminal receive associates again; Association judging unit: for judge described mobile terminal whether using multicast service and providing the current access point of service and described mobile terminal to be again associated with for described mobile terminal target access whether in same Robust Secure Network related network; And multicast context block of information generation unit, for when judged result is all for being, produce the multicast context block of information as the information block be described the multicast service of described mobile terminal, and send described multicast context block of information by described access point Transmit-Receive Unit to described target access, to make it possible to the multicast service of described mobile terminal to be switched to described target access.
In accordance with a further aspect of the present invention, propose a kind of access point, comprise: access point Transmit-Receive Unit, for receiving from for described mobile terminal provides the multicast context block of information of the current access point of service, described multicast context block of information is the information block be described the multicast service of described mobile terminal; Information extraction unit, for extracting the information relevant with multicast service from described multicast context block of information, and judge whether according to extracted information the multicast group that there is described mobile terminal place, if there is no, send IGMP (IGMP) by described access point Transmit-Receive Unit to multicast agent and add message; And multicast operation unit: for the feedback result according to described multicast agent, carry out multicast operation so that the multicast service of described mobile terminal is switched to described target access.
In accordance with a further aspect of the present invention, propose a kind of multicast agent, comprising: act on behalf of Transmit-Receive Unit, the target access for will again be associated with from mobile terminal receives IGMP and adds message; Multicast creating unit, for adding message according to described IGMP, for described target access creates the multicast group at described mobile terminal place, and create result to described target access feedback, the multicast service of described mobile terminal can be switched to described target access to make described target access.
In accordance with a further aspect of the present invention, propose a kind of system for mobile multicast, comprise two kinds of above-mentioned access points, above-mentioned multicast agent and mobile terminal.
By the technical scheme that embodiments of the invention propose, can support mobile multicasting service in a wireless local area network, especially, what make to carry out mobile multicasting service by IEEE802.11r and IEEE802.11f communication protocol is switching to possibility.
Accompanying drawing explanation
According to following description by reference to the accompanying drawings, advantage of the present invention will become easy to understand, wherein:
Fig. 1 shows the schematic diagram of the system for mobile multicast according to the embodiment of the present invention;
Fig. 2 shows the structured flowchart of the access point apparatus according to the embodiment of the present invention;
Fig. 3 shows the flow chart of the mobile multicasting method according to the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail, eliminating in the course of the description is unnecessary details and function for the present invention, causes obscure to prevent the understanding of the present invention.
Agreement IEEE802.11r in IEEE802.11 protocol suite and 802.11f is two kinds of agreements making WiFi/WLAN user to move fast and to switch.But current IEEE802.11r and 802.11f does not support mobile multicast, which prevent the actual deployment of IEEE802.11 agreement.Exemplary description is carried out below by for IEEE802.11 agreement.But it is appreciated that and also following technical scheme can be used for other agreement, as wireless access point control and configuration (CAPWAP) agreement.
In an embodiment of the present invention, propose a kind of system for mobile multicast, as shown in Figure 1, this system includes two access point apparatus (AP), a multicast agent and a mobile terminal (MS).It will be recognized by those skilled in the art that Fig. 1 is only the exemplary system figure that the embodiment of the present invention is described, in the system of actual deployment, can have multiple AP, multiple multicast agent and multiple MS, the structure of system also can be more complicated.In the following description, assuming that AP1 is for MS provides current AP, the AP2 of service to be the target AP that MS will be associated with again.
Also proposed a kind of access point apparatus (AP), as shown in Figure 2, this AP comprises AP Transmit-Receive Unit 210, for receiving the request that MS associates again.Association judging unit 220, for judging whether the MS asking again to associate is using multicast service and current AP whether to associate in (RSNA) network at same Robust Secure Network with target AP.MCB generation unit 230, all generates multicast context block of information (MCB, multicast context block) for the judged result at association judging unit in being.MCB is the information block that the multicast service used MS is described.
This AP also comprises information extraction unit 240, for at this AP be MS will again be associated with target AP, the information relevant with multicast service is extracted (namely from MCB, IPTV/ multicast information in MCB), and according to this information, detect the multicast group whether this AP has existed this MS place, if there is no, then send IGMP by AP Transmit-Receive Unit 210 to the multicast agent of this network and add message, to add the multicast group at the MS place comprised in MCB.
This AP also comprises multicast operation unit 250, for carrying out multicast operation, e.g., adds MS place multicast group.
This AP also comprises associated operation unit 260, at this AP be MS will again be associated with target AP, MS is associated again with this AP, makes to provide multicast service by this AP to MS.
Additionally provide a kind of multicast agent, as shown in Figure 3, this multicast agent comprises acts on behalf of Transmit-Receive Unit 310, the message (e.g., IGMP multicast join message) that the target AP that will again be associated with for receiving MS sends.Multicast creating unit 320, in advance MS being joined this multicast group according to the message received, that is, for target AP creates the multicast group at MS place.
Although above with the AP of the formal description embodiment of the present invention of the functional module be separated and multicast agent, but each assembly shown in Fig. 2 and Fig. 3 can realize with multiple device in actual applications, the multiple assemblies illustrated also can be integrated in chip piece or an equipment in actual applications.This AP and multicast agent can comprise any unit for other object and device.Assemblies different in AP described above can also be used in the different phase of multicast service, or different assemblies is placed in different equipment, such as, if AP is for MS provides the current AP of service, what then use is association judging unit 220 and MCB generation unit 230, and if AP is target AP, then use information extraction unit 240, multicast operation unit 250 and associated operation unit 260, therefore, the assembly needing to use can be only included in different equipment.
Below with reference to the mobile multicasting method shown in Fig. 4, above-described AP and multicast agent are described in detail.
Fig. 4 is the flow chart of the mobile multicasting method of the embodiment of the present invention.
In step 410, the AP Transmit-Receive Unit 210 of AP1 (that is, the current service AP of MS) receives the request again associated from MS.
In step 420, the association judging unit 220 of AP1 judges; 1. MS whether using multicast service now and 2. AP1 and target AP 2 (that is, MS will again be associated with target AP) whether in same RSNA network.
1. the judgement of step 420 means, switch if following, such as, when MS is switched to AP2 from AP1, the IPTV/ multicast service of MS also seamlessly will be switched to AP2 from AP1.
If have one to be false in above two judgements, flow process proceeds to step 480, directly MS is associated with AP2 again.
If above two judgements are all set up, flow process proceeds to step 430, and the MCB generation unit 230 in AP1 generates MCB, and is passed through AP Transmit-Receive Unit 210 and send to AP2.
For IEEE802.11r/f agreement, can define to MCB the multicast information describing and comprise MS.The following shows the example that MCB is defined:
In this example, MCB include MS MAC Address, add the content such as the IP address of multicast group, the qos parameter of IPTV channel.However, it is to be emphasized that the size of MCB and content are not fixing, dynamic expansion can be carried out to MCB according to actual needs in other example, to comprise more multicast information and/or IPTV parameter.
And if the content of MCB only comprises the MAC Address of MS, this means that this MS does not use any IPTV/ multicast, therefore such MCB is invalid.
Now return Fig. 4, in step 440, the AP Transmit-Receive Unit 210 of AP2 receives the MCB of AP1 transmission, and information extraction unit 240 extracts the comprised information (that is, IPTV/ multicast information) relevant with multicast service from this MCB.
In step 450, whether the information extraction unit 240 of AP2 has existed the multicast group at this MS place according to this infomation detection AP2.
If there is no, then in step 460, the IGMP sending standard by AP Transmit-Receive Unit 210 to the multicast agent of this network adds message, to add the multicast group at the MS place comprised in MCB.
Multicast creating unit 320 in multicast agent is the multicast group that target AP (that is, AP2) creates MS place, and to AP2 feedback result.Here multicast group creates can carry out according to the multicast group visioning procedure in concrete agreement, is not further elaborated at this.
In step 470, the multicast operation unit 250 in AP2 carries out multicast operation according to from after the feedback result of multicast agent, and multicast operation here comprises and adds the conventional multicast operation such as multicast group, registration.Here feedback result can be the standard message in multicast service flow process.
In step 480, MS is associated with AP2 from AP1 by associated operation unit 260 in AP2 again, thus can continue as MS by AP2 and provide IPTV/ multicast service.
Below with IEEE802.11r and IEEE802.11f for example describes mobile multicasting method of the present invention.
Example one
According to IEEE802.11r, MCB can be created in resource information memory (RIC) embedded in IEEE802.11 message.Concrete grammar can be expand to carry the MCB transmitted by resource request message to RIC.In the RSNA of IEEE802.11, just exchange resource request and resource response after setting up pair temporal key (PTK), and come reserved resource request and resource response by the integrity check of message, to guarantee the safety of MCB.IEEE802.11r frame structure after MCB expansion is as follows:
IEEE802.11r frame structure after table 1 expansion
The structure of IEEE802.11r fast B SS information converting unit is wherein as shown in table 2:
Table 2. fast B SS information converting unit
Can find out, in an embodiment of the present invention, the frame structure of IEEE802.11 is expanded, add " resource information memory-data " and " resource information memory-MCB " two information words and " fast B SS information converting unit " is revised, thus carry MCB in the message of IEEE802.11.
Example 2
Multicast context block of information (MCB) can be created in the IAPP-MOVE message of IEEE802.11f.Access point internal agreement (IAPP) supports the transmission of the MS content information between reciprocity AP.Two IAPP message (IAPP MOVE-notify and IAPP-MOVE.indication) can carry content information, and can carry MCB in the expansion content blocks of MOVE-response grouping.In the IAPP MOVE-response indicated the current multicast business of MS divides into groups, MCB must be observable.
When receiving IAPP MOVE-notify and IAPP-MOVE.indication, the multicast operation unit 250 of AP1 will generate the IAPP MOVE-response including all multicast content information that AP1 creates:
After receiving this business primitive (primitive), AP1 will be forwarded in the reciprocity IAPP entity of AP2 (after the completion of the handover) by all related contents of MS again associated by relating to, wherein, AP2 associates with MS by sending IAPP MOVE-response grouping, after this response occurs, the discardable any multicast content for the MS by the identification of MAC Address parameter of AP1.
It is appreciated that, the technology that the embodiment of the present invention provides is not only for IEEE802.11r/f, may be used for other system that can realize mobile multicast equally, such as, when using wireless access point control and configuration (CAPWAP) agreement, only need provide the assembly identical with the assembly function that AP in technique scheme uses to access controller (AC), and message like the classes of messages used and use in technique scheme, just can realize the technical scheme disclosed in the embodiment of the present invention.
Those skilled in the art should be easy to recognize, can be realized the different step of said method by programmed computer.At this, some embodiments comprise equally machine readable or computer-readable program storage device (as, digital data storage medium) and encoding machine can perform or the executable program command of computer, wherein, this instruction performs some or all steps of said method.Such as, program storage device can be digital storage, magnetic storage medium (as Disk and tape), hardware or the readable digital data storage medium of light.Embodiment comprises the programmed computer of the described step performing said method equally.
Description and accompanying drawing only illustrate principle of the present invention.Therefore it should be appreciated that those skilled in the art can advise different structures, although these different structures clearly do not describe herein or illustrate, embody principle of the present invention and be included within its spirit and scope.In addition, all examples herein mentioned clearly main only for teaching purpose with the design of the promotion this area helping reader understanding's principle of the present invention and inventor and contribute, and should be interpreted as not being the restriction to these specific examples of mentioning and condition.In addition, herein all mention principle of the present invention, aspect and embodiment statement and specific example comprise its equivalent.
Description is above only for realizing embodiments of the invention; it should be appreciated by those skilled in the art; the any modification or partial replacement do not departed from the scope of the present invention; the scope that all should belong to claim of the present invention to limit; therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (14)
1., for a method for the mobile multicast in WLAN (wireless local area network), comprising:
The request that mobile terminal receive associates again;
Multicast service is used at described mobile terminal, and the target access providing the current access point of service and described mobile terminal to be again associated with for described mobile terminal in same Robust Secure Network related network time, produce the multicast context block of information as the information block be described the multicast service of described mobile terminal; And
Described multicast context block of information is sent to described target access, described target access can be switched to make the multicast service of described mobile terminal.
2. method according to claim 1, also comprises:
The content of needs to described multicast context block of information according to realizing carries out dynamic expansion.
3. method according to claim 1 and 2, wherein, is sent to described target access by described multicast context block of information and comprises:
By the expansion of IEEE 802.11 frame structure, described multicast context block of information is sent to described target access; Or
In Access Network internal agreement (IAPP) message, described multicast context block of information is sent to described target access.
4., for a method for the mobile multicast in WLAN (wireless local area network), comprising:
From for described mobile terminal provides the current access point receiving group contextual information block of service, described multicast context block of information is the information block be described the multicast service of described mobile terminal;
Judge whether according to extracted information the multicast group that there is described mobile terminal place, if there is no, send IGMP (IGMP) to multicast agent and add message; And
Feedback result according to described multicast agent carries out multicast operation, so that the multicast service of described mobile terminal is switched to described target access.
5. method according to claim 4, also comprises:
After the multicast service of described mobile terminal is switched to described target access, complete the again association of described mobile terminal to described target access.
6., for the method adding multicast group in WLAN (wireless local area network), comprising:
The target access reception IGMP that will again be associated with from mobile terminal adds message, it is judged to send when there is not the multicast group at described mobile terminal place from the multicast context block of information providing the current access point of service to receive for described mobile terminal in basis by described target access that described IGMP adds message, and described multicast context block of information is the information block be described the multicast service of described mobile terminal;
Message is added according to described IGMP, for described target access creates the multicast group at described mobile terminal place, and create result to described target access feedback, the multicast service of described mobile terminal can be switched to described target access to make described target access.
7., for a multicast context transmission method for WLAN (wireless local area network), comprising:
Generate the information block that the multicast service provided for mobile terminal is described;
Described information block is sent to other access point except the access point of described multicast service is provided, can seamlessly transfers to other access point described to provide to make described multicast service.
8., for an access point for WLAN (wireless local area network), comprising:
Access point Transmit-Receive Unit, for the request that mobile terminal receive associates again;
Association judging unit: for judge described mobile terminal whether using multicast service and providing the current access point of service and described mobile terminal to be again associated with for described mobile terminal target access whether in same Robust Secure Network related network; And
Multicast context block of information generation unit, for the affirmative determination result according to association judging unit, produce the multicast context block of information as the information block be described the multicast service of described mobile terminal, and send described multicast context block of information by described access point Transmit-Receive Unit to described target access, to make it possible to the multicast service of described mobile terminal to be switched to described target access.
9. access point according to claim 8, wherein, described current access point and described target access are the access controllers in the access point or wireless access point control and configuration protocol used in IEEE 802.11 protocol suite.
10., for an access point for WLAN (wireless local area network), comprising:
Access point Transmit-Receive Unit, for receiving from for described mobile terminal provides the multicast context block of information of the current access point of service, described multicast context block of information is the information block be described the multicast service of described mobile terminal;
Information extraction unit, for extracting the information relevant with multicast service from described multicast context block of information, and judge whether according to extracted information the multicast group that there is described mobile terminal place, if there is no, send IGMP (IGMP) by described access point Transmit-Receive Unit to multicast agent and add message; And
Multicast operation unit: for the feedback result according to described multicast agent, carries out multicast operation so that the multicast service of described mobile terminal is switched to described target access.
11. access points according to claim 10, also comprise:
Again associative cell, for after the multicast service of described mobile terminal is switched to described target access, is associated with target access again by described mobile terminal, with by described target access for described mobile terminal continues to provide multicast service.
12. access points according to claim 10 or 11, wherein, described current access point and described target access are the access controllers in the access point or wireless access point control and configuration protocol used in IEEE 802.11 protocol suite.
13. 1 kinds, for the multicast agent of WLAN (wireless local area network), comprising:
Act on behalf of Transmit-Receive Unit, target access for will again be associated with from mobile terminal receives IGMP and adds message, it is judged to send when there is not the multicast group at described mobile terminal place from the multicast context block of information providing the current access point of service to receive for described mobile terminal in basis by described target access that described IGMP adds message, and described multicast context block of information is the information block be described the multicast service of described mobile terminal;
Multicast creating unit, for adding message according to described IGMP, for described target access creates the multicast group at described mobile terminal place, and create result to described target access feedback, the multicast service of described mobile terminal can be switched to described target access to make described target access.
14. 1 kinds of systems for the mobile multicast in WLAN (wireless local area network), comprise access point according to claim 8 or claim 9, according to claim 10 to the access point according to any one of 12, multicast agent according to claim 13 and mobile terminal.
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| PCT/CN2010/000480 WO2011127623A1 (en) | 2010-04-12 | 2010-04-12 | Method and device for mobile multicast |
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| CN1983945A (en) * | 2006-06-19 | 2007-06-20 | 华为技术有限公司 | Method for realizing multiple packet broadcasting service |
| CN101253771A (en) * | 2005-08-30 | 2008-08-27 | 汤姆森许可贸易公司 | Cross layer optimizing capable of extending video frequency multicasting for IEEE802.11 wireless local area network |
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| US20020170064A1 (en) * | 2001-05-11 | 2002-11-14 | Monroe David A. | Portable, wireless monitoring and control station for use in connection with a multi-media surveillance system having enhanced notification functions |
| JP4002204B2 (en) * | 2002-04-09 | 2007-10-31 | 三星電子株式会社 | Control information transmission apparatus and method for multimedia broadcast / multicast service in mobile communication system |
| KR100937419B1 (en) * | 2003-10-02 | 2010-01-18 | 엘지전자 주식회사 | Method for connecting broadcasting or multicast service between network elements in mobile communication system |
| CN100450113C (en) * | 2005-10-31 | 2009-01-07 | 华为技术有限公司 | Method for registering multimedia service of broadcast / multicast service |
| WO2007130012A1 (en) * | 2006-04-29 | 2007-11-15 | Thomson Licensing | Seamless handover of multicast sessions in internet protocol based wireless networks using staggercasting |
| CN100473013C (en) * | 2006-08-18 | 2009-03-25 | 中兴通讯股份有限公司 | Method for establishing context in multicast service of mobile communication system |
| CN101568069B (en) * | 2008-04-25 | 2011-08-17 | 上海贝尔阿尔卡特股份有限公司 | Method and device for providing multicast service for external mobile terminal |
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| CN101253771A (en) * | 2005-08-30 | 2008-08-27 | 汤姆森许可贸易公司 | Cross layer optimizing capable of extending video frequency multicasting for IEEE802.11 wireless local area network |
| CN1983945A (en) * | 2006-06-19 | 2007-06-20 | 华为技术有限公司 | Method for realizing multiple packet broadcasting service |
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| CN102792709A (en) | 2012-11-21 |
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