CN101494575B - Management method and proxy equipment for personal area network - Google Patents
Management method and proxy equipment for personal area network Download PDFInfo
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- CN101494575B CN101494575B CN2008100008046A CN200810000804A CN101494575B CN 101494575 B CN101494575 B CN 101494575B CN 2008100008046 A CN2008100008046 A CN 2008100008046A CN 200810000804 A CN200810000804 A CN 200810000804A CN 101494575 B CN101494575 B CN 101494575B
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Abstract
The invention discloses a personal area network management method which comprises the following steps of: receiving a switching request transmitted by a first terminal, wherein, the request includes a target terminal identifier, a business flow identifier and an action identifier; allocating the care of address according to the switching request and storing the care of address; carrying out connection according to the care of address and the target terminal, and determining the business flow and the action according to the business flow identifier and the action identifier in the request; and transmitting the determined business flow to the target terminal according to the determined action. The invention also discloses agency equipment which comprises a receiving unit, a registration unit, a storing unit and a transmitting unit. The implementation of the invention can reduce the occupation of interface-free resources and shorten the processing time for the switching; furthermore, as one piece of agency equipment can process the business of a plurality of terminals, the bottleneck problem in business processing can be avoided.
Description
Technical field
The present invention relates to communication field, relate in particular to the management method and the agent equipment of a kind of territory net.
Background technology
Along with the appearance of multiple wired, wireless access technology and distinct communication standards, the future communications mode will present abundant isomerism; In the development trend of fusion, all-IPization and customer-centric, how different technologies is various to enjoy, the ability of individual business for the user uses with providing convenience, has become the emphasis of broad research.
And individual territory net (PAN, Personal Area Network) is to provide a focus various, individual business for the user.Individual territory net (PAN) is meant that the user has only an effective UE (User Equipment, subscriber equipment), but except UE, the user can also use comprise physically separate with UE or attached to the building block on the UE, as ME (Mobile Equipment, mobile device), TE (TerminalEquipment, terminal equipment) etc., within the specific limits, as family, office etc., enjoy various business; And PAN management is meant that with user, business be the center, pays close attention to the centralized management of various terminals of user and peripheral hardware, and it can make user's different abilities of its terminal or terminal peripheral hardware that are fully utilized, thereby obtains better business experience.
But the current wireless system as the basis, has supplementary service such as SMS, MMS, IMS etc. with voice/service simultaneously, but the constraint that particular technology and network infrastructure are all received in these services, the user can't use the terminal of different access technologies to obtain such service.And user's needs is when session or transfer of data, can keep continuity under the situation of changing communicator.
Therefore in order to realize that with user and business be the PAN mobile management at center, industry and academia have proposed following technical scheme:
For example: a user is busy with carrying out live Word message conversational communication on the computer of fixed position, and also continues this live telecast Word message conversational communication when mobile.So when the user need be when computer switches on the mobile phone terminal with live Word message conversational communication, detailed process is:
Step 101: send satellite information by mobile phone terminal to GPRS network, obtain the IP address.
Step 102:GPRS network-feedback IP address is to mobile phone terminal.
Step 103: mobile phone terminal carries out endpoint registration by Internet to SMC (Service Management Center, Service Management Center); Carry out so that the business on the computer is transformed on the mobile phone terminal.
Step 104:SMC is according to the end message retrieval user configuration of storage in advance; If do not retrieve, to mobile phone terminal inquiry user terminal ability information.
Step 105: mobile phone terminal by world-wide web to SMC feedback terminal ability and service configuration.
Step 106:SMC transfers on the mobile phone terminal according to mobile phone terminal ability and service configuration decision service.
Step 107:SMC sends starting command to services client/server.
Step 108: services client/server feeds back starting command to mobile phone terminal.
Though this technical scheme has realized the terminal of carrying out according to user's actual demand in the net of individual territory and has changed, and need increase SMC, two equipment of services client/server newly, has not only increased the complexity of network, and has increased the network configuration cost greatly; And owing to SMC, services client/server all are positioned at outside the territory net, therefore the Signalling exchange that carries out between the network equipment of each terminal, terminal all needs to control through SMC, caused interaction flow many, processing time is long, the waste of network interface-free resources, and the easy problem that occurs the disposal ability bottleneck in the SMC side.
Summary of the invention
The embodiment of the invention provides individual territory net management method.This method is achieved through the following technical solutions:
Receive the handoff request that first terminal sends, comprise target terminal sign, traffic stream identifier and action identification in the described request;
Distribute Care-of Address and store described Care-of Address according to handoff request;
Be connected with target terminal according to described Care-of Address, and determine Business Stream and action according to the traffic stream identifier in the described request, action identification;
Described definite Business Stream is sent to described target terminal according to described definite action.
The embodiment of the invention also provides a kind of agent equipment, and this agent equipment specifically comprises:
Receiving element is used to receive the handoff request that first terminal sends, and comprises the target terminal sign in the described request, and traffic stream identifier, action identification;
Registering unit is distributed Care-of Address according to request;
Memory cell is used for action identification and movement content corresponding stored, and the Care-of Address of storage registering unit distribution;
Transmitting element is used for being connected with target terminal according to described Care-of Address, and determines Business Stream and action according to the traffic stream identifier in the described request, action identification; Described definite Business Stream is sent to described target terminal according to described definite action.
In sum, the present invention is by upgrading the MIPv6 data structure, increased the traffic identifier of service switchover, the contents such as change action sign that need carry out in individual territory net is managed, when making that carrying out terminal in the net of individual territory switches, agent equipment has guaranteed carrying out smoothly of switching.And all terminals are all only carried out information interaction by agent equipment, avoided the use outer net, reduced the taking of interface-free resources, processing time also shortlyer relatively, and, also can avoid bottleneck problem in business processing because agent equipment can be handled the business of a plurality of terminals.
Description of drawings
Fig. 1 is the art methods flow chart;
Fig. 2 is an embodiment of the invention system diagram;
Fig. 3 is the individual territory net management method flow diagram of the embodiment of the invention 1;
Fig. 4 is the specific implementation process flow diagram of the embodiment of the invention 1;
Fig. 5 is the agent equipment structure chart of the embodiment of the invention 2;
Fig. 6 is an embodiment of the invention MIPv6 protocol extension schematic diagram;
Fig. 7 is the expansion schematic diagram of the embodiment of the invention to Binding Update (BU) message;
Fig. 8 replys the expansion schematic diagram of state information sign indicating number in the BA message to binding for the embodiment of the invention.
Embodiment
The embodiment of the invention provides individual territory net management method.Owing to can use Care-of Address in the territory net, therefore at first introduce this notion.Mobile IP (MIP, Mobile IP) agreement is supported mobile node (MN, Mobile Node) connectivity when mobile in IP network, and MN still can be kept after leaving its home network and being connected of network.MN adopts home address (HoA, Home Address) to identify all the time, and the change because of visited network does not change; But when MN leaves home network, will be associated with a Care-of Address (CoA, Care of Address), the current location of MN will be identified by CoA, and it will send its current location information to home agent (HA, Home Agent) simultaneously.And HA sends to intercepting and capturing the packet of MN HoA and it is transmitted to the CoA of MN.Briefly Care-of Address is exactly the address information of sign terminal location under an agent equipment.
Referring to Fig. 2, the network overall situation that the embodiment of the invention is carried out is mainly, and first terminal equipment in the net of individual territory is connected with the agent equipment during net in a territory, and agent equipment is undertaken alternately by the 3rd terminal equipment of Internet net and opposite end then; If in the time of will carrying out the business conversion, target terminal equipment is connected with agent equipment.Agent equipment in the net of individual territory can be home gateway.
First terminal carries out being understandable that and must first terminal registering at agent equipment, and obtained CoA before business change to other target terminals in the net of individual territory, has carried out the process of communicating by letter with the 3rd terminal.
Step 301: first terminal sends handoff request, can comprise at least one target terminal sign, at least one traffic stream identifier and action identification in this request.
The Business Stream of herein mentioning can be divided into multiple stream with business according to the transmission needs, for example whole service can be divided into audio stream and video flowing transmits.So Business Stream is identified, just can be to the different line operates that flow in the business, thus realize the operation trickleer to business.Wherein, can comprise a plurality of traffic stream identifier and an action identification in the request, at this moment, determine concrete action, different Business Streams is carried out identical action according to action identification; Perhaps, can comprise a plurality of traffic stream identifier and a plurality of action identification in the request, the respectively corresponding action identification of each traffic identifier, corresponding relation according to traffic identifier and action identification, a certain Business Stream is carried out the action that the corresponding action identification of this stream is determined, the action identification of different business traffic identifier correspondence can be the same or different.
Step 302: agent equipment receives the request that described first terminal sends, and is designated at least one target terminal distribution CoA according to the target terminal in the request, and stores this CoA, finishes the CoA registration of target terminal on agent equipment.
In this step, in order to allow first terminal recognize in time whether request can be carried out, agent equipment can also be to response message of first terminal feedback, informs that first terminal can carry out corresponding operating according to its request, and can further carry the CoA of target terminal.This response message can not feed back yet, and the feedback of this response message does not influence the realization of the embodiment of the invention, does not constitute the restriction to the embodiment of the invention yet.
Step 303: the CoA according to described target terminal is connected with at least one target terminal, promptly sends beep-page message by described Care-of Address to target terminal, activates target terminal;
Step 304:, determine Business Stream and carry out action, and the Business Stream of determining is carried out corresponding action according to traffic stream identifier and action identification.
For example, the 3rd terminal and first terminal communicate, determined that according to traffic stream identifier the 3rd terminal is sent to the audio stream of first terminal, determined that according to action identification the action of carrying out is a replication stream, then, duplicate and be sent to target terminal the audio stream in the business of the 3rd terminal and first terminal communication.Wherein, can be in agent equipment the corresponding relation of storage action sign and concrete action in advance, correspond to the particular content of action according to action identification, determine to carry out action with this according to action identification.
Described Business Stream execution corresponding action to determining, can be specially: agent equipment sends beep-page message according to the sign of target terminal at least one target, activates target terminal; When target terminal was in state of activation, agent equipment was carried out corresponding action to the content of definite Business Stream.
Wherein, traffic stream identifier can comprise audio identification and video labeling etc., and the action of execution can be replication stream, can be to switch stream.
Step 305: target terminal sends de-registration request to agent equipment, carries the CoA of target terminal in this request, and present business is ended in request.
Step 306: agent equipment is nullified the CoA of this target terminal according to de-registration request, then traffic identifier corresponding service stream in the described handoff request is sent to first terminal; Perhaps can be with after traffic identifier corresponding service stream is sent to first terminal in the described handoff request, nullify the CoA of this target terminal again, agent equipment can further send to this target terminal and nullify acknowledge message this moment.
Can also pass through mode alternative steps 305 to 306 in addition.For example receive the recovery request that first terminal sends, can comprise the CoA that receives in the sign of target terminal or the step 302 in this request, agent equipment is according to the sign or the CoA of target terminal then, the current business of termination target terminal.Agent equipment is nullified the CoA of this target terminal according to recovery request, then traffic identifier corresponding service stream in the handoff request is sent to first terminal; Perhaps can be after traffic identifier corresponding service stream in the handoff request is sent to first terminal, nullify the CoA of this target terminal again; And further send notice of cancellation to first terminal.
Wherein, above-mentioned is sent to first terminal with traffic identifier corresponding service stream in the described handoff request, can be specifically: after receiving the CoA of target terminal, owing to carry out corresponding to CoA when before Business Stream being switched to target terminal, after agent equipment receives CoA so, the Business Stream that CoA that can be by target terminal or sign determine to be sent to first terminal, in fact this Business Stream traffic identifier corresponding service stream in the handoff request just.
Below by a concrete example specific implementation process of the embodiment of the invention 1 is described, referring to Fig. 4:
Step 401: first terminal is carried out visual telephone by agent equipment and the 3rd terminal;
Step 402: when needs generation audio stream switched, first terminal sent handoff request to agent equipment, and this request carries sign, and the sign of audio service traffic identifier, action of target terminal;
Step 403: agent equipment distributes CoA according to the target terminal that is designated of target terminal;
Step 404: agent equipment can be according to the response message of request execution to first terminal feedback; Can carry the CoA of target terminal in this response message, with the target terminal of informing that first terminal is concrete;
Step 405: agent equipment sends beep-page message to target terminal, activates target terminal;
Step 406: target terminal activates response;
Step 407: the audio service traffic identifier that agent equipment switches as required finds the audio stream from the 3rd terminal, find the movement content that is stored in advance in the agent equipment to be switching according to action identification, to send to target terminal from the audio stream of the 3rd terminal, cancellation is sent to first terminal with audio stream.At this moment, the video traffic that carries out between first terminal and the 3rd terminal is proceeded, and does not need to switch to target terminal.
In this step if find the movement content that is stored in advance in the agent equipment when duplicating according to action identification, to send to target terminal from the audio stream of the 3rd terminal, but also can continue audio stream is sent to first terminal, the video traffic that carries out between first terminal and the 3rd terminal is proceeded simultaneously, and does not need to be copied to target terminal.
Step 408: when needs recovered communicating by letter of first terminal and the 3rd terminal, target terminal sent de-registration request to agent equipment, includes the CoA of this target terminal in this request;
Step 409: agent equipment is nullified the CoA of this target terminal;
Step 410: agent equipment sends to this target terminal confirms logout message;
Step 411: after the CoA that has carried out target terminal nullifies, agent equipment will still be sent to first terminal from the audio traffic streams of the 3rd terminal.
In addition, can also replace step 408 in the following manner to step 411, recover communicating by letter of first terminal and the 3rd terminal: first terminal sends recovery request to agent equipment, can carry target terminal sign in this recovery request, perhaps carry the CoA of the target terminal in the response message of step 404; Agent equipment is nullified target terminal according to the CoA of target terminal sign or target terminal; After the cancellation of having carried out target terminal, agent equipment will still be sent to first terminal from the audio traffic streams of the 3rd terminal, and can further send notice of cancellation to first terminal, perhaps agent equipment will still be sent to from the audio traffic streams of the 3rd terminal after first terminal, again target terminal is nullified, and can further be sent notice of cancellation to target terminal.
Receiving element 501 is used to receive the handoff request that first terminal sends, and comprises the target terminal sign in the described request, and traffic stream identifier, action identification;
Registering unit 502 is used for distributing Care-of Address according to the handoff request that described receiving element 501 receives;
Transmitting element 504 is used for being connected with target terminal according to the Care-of Address that described registering unit is distributed, and determines Business Stream and action according to the traffic stream identifier in the described handoff request, action identification; Described definite Business Stream is sent to described target terminal according to described definite action.
Wherein said transmitting element 504 specifically comprises: determining unit, be used for determining Business Stream according to the traffic stream identifier of described request, and to the corresponding relation of preserving in advance, determine movement content according to the action identification in the described request; Set up the unit, be used for being connected with at least one target terminal by described Care-of Address; Performance element is used for described definite Business Stream is sent to described target terminal according to described definite action.
In other embodiments, receiving element 501 can also be further used for the ending request that the receiving target terminal sends, and comprises Care-of Address in this request; Memory cell 503 can also be further used for according to the corresponding Care-of Address of described ending request deletion; Transmitting element 504 can also be further used for traffic identifier corresponding service stream in the described handoff request is sent to first terminal.
In other embodiments, this equipment further comprises feedback unit 505, is used for the Care-of Address to the first terminal feedback allocation; Receiving element 501 is further used for receiving the recovery request that first terminal sends, and carries the sign or the Care-of Address of target terminal in this request; Memory cell 503 is further used for according to the corresponding Care-of Address of described recovery request deletion; Transmitting element 504 is further used for traffic identifier corresponding service stream in the described handoff request is sent to first terminal.
Terminal described in the above embodiment can be mobile phone, PDA (Personal Digital Assistant, personal digital assistant), computer equipment etc.
Above message has been introduced the specific implementation process of the embodiment of the invention, because embodiments of the invention can be at MIPv6 (Mobile Ipv6, mobile Ipv6 agreement) carries out under the agreement, but need carry out some expansions, therefore introduce the content of expansion MIPv6 below the MIPv6 agreement.
Expansion to the MIPv6 agreement comprises:
1) to the expansion of mobile option:
Referring to Fig. 6, MIPv6 (Mobile Ipv6, mobile IPv 6 protocol) the increase type is 6,7 new mobile option (mobility option), its effect is to the agent equipment registration or nullifies one or more CoA address, and allow the behavior of agent equipment according to user's appointment, on the terminal of the CoA that registers having/nullify, carry out corresponding flow operation;
The content containing type of mobile option, length, flow label (will of failing to be sold at auction form), actions (needing the action of execution), res (extension bits) and one or more CoA address;
Among Fig. 6, the concrete implication of each field is:
Type: the type of mobile option; Wherein, the mobile option type that is used for one or more CoA registration is 6, and the mobile option type that is used to nullify one or more CoA is 7;
Len: the length that identifies whole mobile option;
Flow Label: be used for combining the data flow that sign need be operated with the actions field;
Actions: combine with flow label field, point out the operation that to carry out respective stream of data;
Res: reserved field;
CoA1～CoA2: need to register/the CoA address of nullifying; But be not restricted to 2 CoA addresses, can extend to a plurality of as required or have only 1.
That is to say in the whole communication process can unified each professional traffic identifier, and can store these in advance be identified among the Flow Label on agent equipment, and the agent equipment storage needs movement content that convection current carries out in Actions; When the equipment of agency receives request, can in Flow Label, Actions, carry out correspondence according to the action of traffic identifier in the request and needs execution and search, carry out corresponding action then; Agent equipment is that the CoA address that target terminal distributes just is stored among CoAl～CoAn.
2) referring to Fig. 7, to the expansion of Binding Update (BU) message:
Whether use the 1bit in the existing BU message to keep the position, being used to indicate needs many CoA registration/cancellations.Wherein I is that 1 expression need be carried out many CoA registration/cancellations, and I is the common Binding Update of 0 expression.That is to say that enchashment has 1 in the reservation position of BU message to identify whether will carry out many CoA registration/cancellations.
3), binding is replied the expansion of state information sign indicating number in the BA message referring to Fig. 8:
Use Status (conditional code) territory in original BA message, increased several conditional codes and be used to indicate and carry out what operation to CoA.Newly-increased following state:
2: receive CoA registration and successful execution corresponding operating;
3: receive CoA and nullify and the successful execution corresponding operating;
140: refusal CoA registration;
141: refusal CoA nullifies;
More than enumerate to the expansion of the expansion of mobile option, Binding Update (BU) message, the expansion of state information sign indicating number in the BA message is replied in binding, all be an example that realizes embodiment of the invention process, do not constitute restriction to the embodiment of the invention.Those skilled in the art should be understood within protection scope of the present invention by similarly expansion.
The embodiment of the invention in sum, by upgrading the MIPv6 data structure, increased the traffic identifier of service switchover, the contents such as change action sign that need carry out in individual territory net is managed, when making that carrying out terminal in the net of individual territory switches, agent equipment has guaranteed carrying out smoothly of switching.And all terminals are all only carried out information interaction by agent equipment, avoided the use outer net, reduced the taking of interface-free resources, processing time also shortlyer relatively, and, so also can avoid bottleneck problem in business processing because 1 agent equipment can be handled the business of a plurality of terminals.
More than the management method and the agent equipment of provided by the present invention territory net is described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (13)
1. territory net management method is characterized in that this method comprises:
Receive the handoff request that first terminal sends, comprise target terminal sign, traffic stream identifier and action identification in the described request;
Distribute Care-of Address and store described Care-of Address according to handoff request;
Be connected with target terminal according to described Care-of Address, and determine Business Stream and action according to the traffic stream identifier in the described request, action identification;
Described definite Business Stream is sent to described target terminal according to described definite action.
2. according to claim 1 territory net management method is characterized in that, the described connection with target terminal according to described Care-of Address is specially:
Send beep-page message according to described Care-of Address to target terminal, activate target terminal.
3. according to claim 1 and 2 territory net management method is characterized in that described Business Stream is specially: voice data or video data.
4. according to claim 1 and 2 territory net management way is characterized in that, distributes behind the Care-of Address further Care-of Address to the first terminal feedback allocation according to handoff request.
5. according to claim 1 and 2 territory net management method is characterized in that, sets up after communication is connected with target terminal, and the further ending request that sends of receiving target terminal comprises the Care-of Address of this target terminal in this ending request;
Delete the Care-of Address of this target terminal according to ending request.
6. according to claim 4 territory net management method is characterized in that, further receives the recovery request that first terminal sends, and carries the sign or the Care-of Address of target terminal in this recovery request;
Care-of Address according to recovery request deletion target terminal.
7. according to claim 4 territory net management method is characterized in that, after reception ending request or the recovery request, further traffic identifier corresponding service stream in the described handoff request is sent to first terminal.
8. according to claim 5 territory net management method is characterized in that, after reception ending request or the recovery request, further traffic identifier corresponding service stream in the described handoff request is sent to first terminal.
9. according to claim 1 and 2 territory net management method is characterized in that, the communication process that carries out with first terminal, target terminal, the 3rd terminal adopts mobile IPv 6 protocol to carry out.
10. an agent equipment is characterized in that, this agent equipment specifically comprises:
Receiving element is used to receive the handoff request that first terminal sends, and comprises the target terminal sign in the described request, and traffic stream identifier, action identification;
Registering unit is distributed Care-of Address according to request;
Memory cell is used for action identification and movement content corresponding stored, and the Care-of Address of storage registering unit distribution;
Transmitting element is used for being connected with target terminal according to described Care-of Address, and determines Business Stream and action according to the traffic stream identifier in the described request, action identification; Described definite Business Stream is sent to described target terminal according to described definite action.
11. agent equipment according to claim 10 is characterized in that, described transmitting element specifically comprises:
Determining unit is used for determining Business Stream according to the traffic stream identifier of described request, determines movement content according to the action identification in the described request to the corresponding relation of preserving in advance;
Set up the unit, be used for being connected with target terminal by described Care-of Address;
Performance element is used for described definite Business Stream is sent to described target terminal according to described definite action.
12. according to claim 10 or 11 described agent equipments, it is characterized in that,
Described receiving element is further used for the ending request that the receiving target terminal sends, and comprises the Care-of Address of this target terminal in this ending request;
Described memory cell is further used for according to the corresponding Care-of Address of described ending request deletion;
Described transmitting element is further used for traffic identifier corresponding service stream in the described handoff request is sent to first terminal.
13., it is characterized in that this equipment further comprises feedback unit according to claim 10 or 11 described agent equipments;
Described feedback unit is used for the Care-of Address to the first terminal feedback allocation;
Described receiving element is further used for receiving the recovery request that first terminal sends, and carries the sign or the Care-of Address of target terminal in this recovery request;
Described memory cell is further used for storing the Care-of Address that described registering unit is distributed, according to the corresponding Care-of Address of described recovery request deletion;
Described transmitting element is further used for traffic identifier corresponding service stream in the described handoff request is sent to first terminal.
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| CN102111827B (en) * | 2011-02-28 | 2013-05-01 | 北京邮电大学 | Switching control system and method in terminal collaboration of PAN |
| WO2012130021A1 (en) * | 2011-03-31 | 2012-10-04 | 北京新岸线无线技术有限公司 | Method and device for deleting service flow |
| CN102891871A (en) * | 2011-07-20 | 2013-01-23 | 中兴通讯股份有限公司 | Virtual terminal system and implement method |
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| CN101047996A (en) * | 2006-06-09 | 2007-10-03 | 华为技术有限公司 | Method, system for acquiring target network transmission address information and its application |
| CN101072426A (en) * | 2006-05-11 | 2007-11-14 | 华为技术有限公司 | Care of address transmission method and system for communication network |
| CN101083613A (en) * | 2006-06-01 | 2007-12-05 | 华为技术有限公司 | Mobile terminal network registering method, HA and HoA distribution method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101072426A (en) * | 2006-05-11 | 2007-11-14 | 华为技术有限公司 | Care of address transmission method and system for communication network |
| CN101083613A (en) * | 2006-06-01 | 2007-12-05 | 华为技术有限公司 | Mobile terminal network registering method, HA and HoA distribution method and system |
| CN101047996A (en) * | 2006-06-09 | 2007-10-03 | 华为技术有限公司 | Method, system for acquiring target network transmission address information and its application |
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Effective date of registration: 20210422 Address after: Unit 3401, unit a, building 6, Shenye Zhongcheng, No. 8089, Hongli West Road, Donghai community, Xiangmihu street, Futian District, Shenzhen, Guangdong 518040 Patentee after: Honor Device Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |
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