CN101022430A - Radio local loop switch-in network system and operating method thereof - Google Patents
Radio local loop switch-in network system and operating method thereof Download PDFInfo
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Abstract
A access network system of radio local loop is prepared as radio-connecting user terminal to base station transceiver, utilizing base station controller to make mutual conversion network gateway control interface protocol data of radio interface protocol data to gateway unit and next generation network, connecting said transceiver to said controller and connecting said controller directly to soft exchange unit in next generation network for carrying out communication.
Description
Technical field
The present invention relates to wireless native loop interconnect network system, and more specifically relate to therein next generation network (NGN) is connected to the wireless native loop interconnect network system that can connect next generation network under wired access network the same terms.
Background technology
In the switch in the public switched circuit network of tradition and the structure of the subscriber's line between the user, often selected wireless local loop (WLL) system to substitute cable access network in recent years, switch and user are connected to each other by copper cash or optical cable in wired connecting system.In wireless local loop system, in radio link, use such as PDS (Personal Digital System, personal digital system), PHS (Personal Handy-phone System, personal portable telephone system) or CDMA are used for the interface of mobile communication.By being connected to the routine call machine, mobile communication terminal or particular terminal the routine call machine can be used in user terminal.
Because the developing rapidly of internet, with the soft switch main flow direction that the next generation network of core has become telecommunications network evolution.It is carrying with the packet network that next generation network (NGN) is one, and the fixedly integrated services network of multiple business such as mobile voice, data and video traffic is provided.The essential characteristic of NGN network is control, carrying and professional separating, and therefore, the sharpest edges of NGN network are network opening.This opening is mainly reflected in and adopts the interface protocol of standard to communicate between each functional entity of the following aspects; The technological innovation development of bearer network can not have influence on providing of high-level business; Introduce application server and third party's application interface and can dispose value-added service and third party's business fast.
Softswitch technology is the typical technology that control, carrying and professional three separate, and NGN network using Softswitch technology provides voice, multimedia and multiple business such as moves, and the hierarchical mode of flexible exchanging network as shown in Figure 1.MGCP is the standard interface protocol of various media gateway in the Softswitch of key-course in the flexible exchanging network and the Access Layer.The major function of media gateway is that dissimilar access waies is converted into RTP/RTCP (RTP/RTCP Real-time Transport Control Protocol) stream that is adapted at transmitting on the IP network.The media gateway type mainly comprises Trunk Media Gateway (Trunk Gateway at present, TG), integrated access media gateway (Access Gateway, AG), multi-service access gateway (Multi-Service Access, MSA), integrated access equipment (Integrated Accesss Device, IAD), media server.According to the business function demand difference of various media gateway, H.248 be applicable to different media gateway types and different scenes respectively with MGCP (Media Gateway ControlProtocol) agreement.
Along with the public switched circuit network of tradition to next generation network evolution, the conventional wireless local loop switch-in network system is connected to the switch of public switched circuit network by the V5.2 interface mode no longer adapts to, and whole like this network has developed into the access of finishing wireless native loop interconnect network by Trunk Media Gateway TG.
Fig. 2 is the block diagram of traditional wireless native loop interconnect network system.
Wireless local loop connecting system 200 is by being used as first base station transceiver (the Base Transceiver Station that carries out wireless transmission with user's fixed terminal 201, BTS) 203, and carry out second base station transceiver 208 of wireless transmission between user's handheld terminal 202, be connected to the node of node in the next generation network (NGN) 210 or Tandem Gateway (TG) 206 or wireless local loop base station controller (Wireless Local Loop Base Station Controller, WSC) 204 and be that the memory 205 of base station controller institute control store is formed according to the interface that is designated V5.2.
Though shown wireless native loop interconnect network system 200 comprises first base station transceiver 203 and second base station transceiver 208, but communicate by letter with first base station transceiver 203 at this supposition fixed terminal 201, handheld terminal 202 is communicated by letter with second base station transceiver 208.
In wireless native loop interconnect network system shown in Figure 2 200, because next generation network signaling and business are all transmitted by the IP switching network, use the wireless native loop interconnect network system 200 of V5.2 interface can't directly insert next generation network 210, need finish access by the Trunk Media Gateway in the next generation network 210 206.After the Trunk Media Gateway termination V5 signaling, convert H.248 agreement to and offer Softswitch 207 and handle, realize V5 user's access; Perhaps Trunk Media Gateway 206 is supported V5UA, and the V5 signaling passes through soft switch by Trunk Media Gateway 206, handles the V5 signaling by Softswitch 207, finishes V5 user's access.
The characteristics of this solution are promptly to have guaranteed communication network to the next generation network smooth evolution, and maximum possible is utilized the existing wireless local loop system of operator simultaneously.But effectively do not utilize the NGN network advantages for this networking mode, some new business can't be used on the wireless local loop system based on V5.2, simultaneously operator still needs to safeguard simultaneously IP backbone and local circuit switching network two network of throwing the net, and operation cost does not descend.
Summary of the invention
Problem in view of in the above-mentioned conventional wireless native loop interconnect network system the purpose of this invention is to provide a kind of wireless native loop interconnect network system, can make it directly to insert next generation network by the IP switching network.
For achieving the above object, the present invention proposes a kind of wireless native loop interconnect network system, comprising: at least one base station transceiver, carry out radio communication by this base station transceiver and user terminal; Base station controller is used for the mutual conversion between the gateway control interface protocol data between Radio interface protocols data and described gateway system and the next generation network, controls described base station transceiver and is connected to next generation network;
Wherein, also comprise:
Memory is read by described base station controller, is used for storaging user data therein;
Media resource processor by described base station controller control, is used to handle dual-tone multifrequency and playback.
Above-mentioned wireless local access net system, wherein, described memory and media resource processor are equipped in the described base station controller.
Above-mentioned wireless native loop interconnect network system, wherein, described memory stores is used for discerning first identifier of the described user terminal of described Radio interface protocols, be used for discerning described gateway control interface protocol described user terminal second identifier and about the data of corresponding relation between described first identifier and described second identifier.
For achieving the above object, the invention allows for that user terminal works the method for operation of exhaling in a kind of wireless native loop interconnect network system, wherein, may further comprise the steps:
Described user terminal sends call message to described base station controller, comprises described first identification code in the described call message;
Described base station controller is accessed in the data in the described memory, and retrieves data in the described memory according to the call message that comprises described first identification code that receives, and obtains described second identification code;
The call message that described base station controller will comprise described second identification code sends to described Softswitch;
Described base station controller control base station transceiver finish by wave point and terminal between operation;
Described Softswitch according to and wireless native loop interconnect network system between interface protocol finish and base station controller between operation.
The method of operation of above-mentioned wireless native loop interconnect network system wherein, also comprises:
When needs were play the bell sound, described base station controller control media resource processor was finished the step of the processing of playback.
The method of operation of above-mentioned wireless native loop interconnect network system wherein, also comprises the step of user terminal call release:
Described user terminal sends release message to described base station controller by described base station transceiver;
Described base station controller sends first message to described Softswitch after receiving described release message;
Described Softswitch finish by corresponding gateway control protocol interface and described base station controller between operation;
Described base station controller discharges Radio Resource; With
Control that described base station transceiver is finished by wave point and described user terminal between operation.
The method of operation of above-mentioned wireless native loop interconnect network system wherein, also comprises the dynamic switch step of coding in the calling procedure:
When network congestion or network condition were better, described Softswitch was confirmed to need to change encoding and decoding speech, and described Softswitch sends first message to described base station controller;
Described base station controller is finished the business change flow process, changes Traffic Channel and/or business option as required, sets up necessary transmission channel; Finish and described user terminal between business change;
Described base station controller replys response for after business change is finished described Softswitch.
For achieving the above object, the invention allows for the method for operation that user terminal is exhaled in a kind of wireless native loop interconnect network system, wherein, may further comprise the steps:
When described Softswitch received to user's calling, described Softswitch sent beep-page message to described base station controller, comprises described second identification code in the described beep-page message;
Data in the described memory of described base station controller access are retrieved the data of described user terminal according to described second identification code, obtain described first identification code;
Described base station controller sends the beep-page message that comprises described first identification code to described base station transceiver, the described paging information that comprises first identification code of described base station transceiver broadcasting;
Described user terminal distinguishes it is to call out oneself, sending a reply information by described first identification code;
Described base station controller control base station transceiver finish by wave point and terminal between operation;
Described Softswitch according to and wireless native loop interconnect network system between interface protocol finish and base station controller between operation.
The method of operation that user terminal is exhaled in the above-mentioned wireless native loop interconnect network system wherein, also comprises the step of user terminal call release:
Described user terminal sends release message to described base station controller by described base station transceiver;
Described base station controller sends first message to described Softswitch after receiving described release message;
Described Softswitch finish by corresponding gateway control protocol interface and described base station controller between operation;
Described base station controller discharges Radio Resource; With
Control that described base station transceiver is finished by wave point and described user terminal between operation.
The method of operation that user terminal is exhaled in the above-mentioned wireless native loop interconnect network system wherein, also comprises the dynamic switch step of coding in the calling procedure:
When network congestion or network condition were better, described Softswitch was confirmed to need to change encoding and decoding speech, and described Softswitch sends first message to described base station controller;
Described base station controller is finished the business change flow process, changes Traffic Channel and/or business option as required, sets up necessary transmission channel; Finish and described user terminal between business change;
Described base station controller replys response for after business change is finished described Softswitch.
Wireless native loop interconnect network system according to the present invention is designed to base station controller and directly is linked into next generation network by the IP switching network, base station controller is undertaken alternately by MGCP and soft switch, realize the calling control of soft switch to the user, simultaneously base station controller medium gateway function such as realize that encoding and decoding, the packing compression of Media Stream, silence detection, the basic playback of voice collect the digits is realized the Media Stream intercommunication between user terminal and other user terminal.Therefore, no longer need to provide the V5.2 interface to be linked in the next generation network by Tandem Gateway as the conventional wireless local loop switch-in network.
In addition, wireless native loop interconnect network can be expanded easily to utilize next generation network to carry the characteristics of separating with control provides integrated service.
Description of drawings
Fig. 1 is the hierarchical mode of flexible exchanging network;
Fig. 2 is the block diagram of traditional wireless native loop interconnect network system;
Fig. 3 is the block diagram of the wireless native loop interconnect network system of one embodiment of the invention;
Fig. 4 is the order chart that sends message when being illustrated in customer call between node;
Fig. 5 is the order chart that sends message when being illustrated in the user and being exhaled between node;
Fig. 6 sends the order chart of message between node when being expression user call release;
Fig. 7 is that presentation code dynamically switches in the order chart that sends message between the node.
Wherein, Reference numeral:
200 wireless native loop interconnect network systems, 210 next generation networks
201 fixed terminals, 202 portable terminals
203 first base station transceivers, 204 base station controllers
205 memories, 206 Trunk Media Gateways
207 Softswitch, 208 second base station transceivers
300 wireless native loop interconnect network systems of the present invention
310 next generation networks of the present invention
301 base station controller 302 media resource processor of the present invention
Embodiment
In one aspect of the invention, provide a kind of wireless native loop interconnect network system, this system comprises: (a) at least one base station, carry out radio communication with a plurality of user terminals; (b) base station controller is controlled this base station and is connected to next generation network; This base station controller comprises media resource processor, is designed to can be base station controller control, is used for DTMF (Dual Tone Multi Frequence, dual-tone multifrequency) and playback and handles; Also comprise memory, be designed to and read by base station controller, be used for storaging user data therein.
In another aspect of this invention, provide the method for the above-mentioned wireless native loop interconnect network system of operation.
The customer call signaling process:
1.1 relevant user's data is stored in the memory;
1.2, send call message to described base station controller by described base station transceiver as user during with his/her terminal off-hook;
1.3 be stored in data in the described memory to obtain an address according to described call message access, described step 1.3 is finished by described base station controller; With
1.4 send first message to described Softswitch with described address;
1.5 described base station controller control base station transceiver is finished by wave point and terminal between operation;
1.6 described Softswitch is finished by corresponding gateway control protocol interface and base station controller between operation;
1.7 described base station controller control media resource processor is finished playback operation.
The user is exhaled signaling process:
2.1 when described Softswitch received call to the user, described Softswitch sent first message to described base station controller;
2.2 described base station controller is used to discern described user's first identifier with acquisition according to the described memory of described first message reference.
2.3 described base station controller sends beep-page message to described base station transceiver, described beep-page message is represented to receive to described user's calling and is comprised described first identifier;
2.4 described base station transceiver when receiving described beep-page message to around broadcast described beep-page message; With
2.5 described first identifier of the identifier of described user's terminal by knowing described terminal is included in the beep-page message of broadcasting like this to distinguish it is its calling.
2.6 described base station controller control base station transceiver is finished by wave point and terminal between operation;
2.7 described Softswitch is finished by corresponding gateway control protocol interface and base station controller between operation;
User's call release flow process:
3.1 user's terminal sends release message to described base station controller by described base station transceiver;
3.2 described base station controller after receiving described release message, sends first message to described Softswitch.
3.3 described Softswitch is finished by corresponding gateway control protocol interface and base station controller between operation;
3.4 described base station controller discharges Radio Resource; With
3.5 control base station transceiver finish by wave point and terminal between operation.
The dynamic switching flow of encoding:
4.1 when network congestion or network condition were better, described Softswitch was confirmed to need to change encoding and decoding speech, described Softswitch sends first message to described base station controller.
4.2 described base station controller is finished the business change flow process, changes Traffic Channel and/or business option as required, sets up necessary transmission channel; Finish business change with terminal room.
4.3 described base station controller replys response for after business change is finished described Softswitch.
That the present invention is described in detail is as follows below in conjunction with the drawings and specific embodiments.
Fig. 3 is the block diagram according to the wireless native loop interconnect network system of the embodiment of the invention.As shown in the figure: wireless native loop interconnect network system 300 of the present invention is by forming with the lower part: first base station transceiver or node 203 and second base station transceiver or node 208, all as the cdma wireless interface between wireless native loop interconnect network system 300 of the present invention and fixed terminal 201 and the portable terminal 202; Also have a node or wireless local loop base station controller 301 of the present invention, be connected to node or soft switch (SoftSwitch) equipment 207 in the next generation network 310 of the present invention according to being identified as H.248 interface.
Though described wireless native loop interconnect network system comprises first and second base station transceiver, all be connected communication by the cdma wireless interface with portable terminal 202 with first base station transceiver at this supposition fixed terminal 201.
First base station transceiver 203 and second base station transceiver 208 are connected to base station controller 301 of the present invention by E1 interface or Ethernet interface.
In the memory 205 storage be used for discerning wireless native loop interconnect network system wireless protocols the user first identifier, be used for discerning user's second identifier of the interface protocol between wireless native loop interconnect network system and the next generation network and with the data of corresponding relation between first and second identifiers of pass.
Explain the operation of wireless native loop interconnect network system referring to Fig. 4～Fig. 6, user terminal 201,202 all uses user terminal 201 to represent.
Fig. 4 is the order chart that sends message when being illustrated in customer call between node.As shown in the figure, may further comprise the steps:
S401, user terminal 201 send call message for first base station transceiver 203.This call message is represented to send calling and is sent this calling according to the cdma wireless agreement.This calling sends to base station controller 301 by first base station transceiver 203.
So the call message that sends comprises IMSI (International Mobile SubscriberIdentification Number, international travelling carriage identification code), i.e. first user identifier of cdma wireless agreement.
S402, when receiving this call message, base station controller 301 is accessed in the user data in the memory 205, and retrieves this user data to obtain address " TerminationID " according to the call message that comprises IMSI that receives.This address " TerminationID " is second user identifier of interface in H.248.
S403, subsequently, base station controller 301 sends " Notify (off-hook) " at interface in H.248 with address " TerminationID " and gives Softswitch 207.
When receiving the notification message that comprises address " TerminationID ", H.248 Softswitch 207 finishes operation with base station controller 301 according to interface.
H.248, base station controller 301 is finished operation with Softswitch 207 according to interface.
S404, base station controller 301 is after receiving that Softswitch 207 requires to set up associated domain and add " Add " message of described " TerminationID " terminal, and described base station controller 301 is according to cdma wireless interface protocol and base station transceiver 203 and the necessary transmission channel of user terminal 201 foundation.
S405, base station controller 301 are after receiving that Softswitch 207 requires " Modify " message of " transmission ring-back tone ", and described base station controller 301 control media resource processor 302 send ring-back tone to user terminal 201.
S406, base station controller 301 are after receiving that Softswitch 207 requires " Modify " message of " stopping to send ring-back tone ", and described base station controller 301 control media resource processor 207 stop to send ring-back tone to user terminal 201.
Fig. 5 is an order chart of representing to send when the user is exhaled message between node.As shown in the figure, may further comprise the steps:
S501, when Softswitch 207 received calling to the user, Softswitch 207 sent expression for base station controller 301 and has received message " Add " to user's calling.This message comprises second user identifier " TerminationID " that is used to discern its user who calls out.
S502, when receiving this message " Add ", base station controller 301 accesses are stored in the user data of memory 205 and retrieve this user data to obtain first identifier IMSI according to second user identifier " TerminationID ".In addition, base station controller 301 distinguishes that the user who utilizes first identifier IMSI to discern is positioned at the zone that first base station transceiver 203 carries out radio communication.
S503, then, base station controller 301 sends beep-page message for first base station transceiver 203.This beep-page message comprises the first user identifier IMSI, and expression is called out the user of field first identifier IMSI identification.
S504, when receiving this beep-page message, first base station transceiver 203 to around broadcast this beep-page message.
S505, when receiving the beep-page message of first base station transceiver, 203 broadcasting, user terminal 201 is included in the beep-page message of broadcasting with user-dependent user's first identifier IMSI, and replys this beep-page message by page-response message to first base station transceiver 203.First base station transceiver 203 sends this message to base station controller 301.
S506, base station controller 301 are after receiving page-response message, and base station controller 301 is set up necessary transmission channel according to cdma wireless interface protocol and user terminal 201.
S507, base station controller 301 is replied Softswitch 207 expressions by " Reply " message of expression " terminal is set up successfully " and has been received to " Add " message of user's calling; And base station controller 301 sends " ring " message for user terminal 201, and user terminal sends terminal acknowledgement message and user's connection message to base station controller 301, and base station controller 301 sends the base station acknowledgement message to user terminal 201.
S508, after Softswitch 207 is received " Reply " message of expression " terminal is set up successfully ", Softswitch 207 H.248 finish according to interface and base station controller 301 between operation, the offhook message of base station controller 301 notice Softswitch 207, Softswitch 207 replys response and the order base station controller monitors onhook event, and base station controller 301 is replied response.
Fig. 6 sends the order chart of message between node when being expression user call release.As shown in the figure, may further comprise the steps:
S601, user terminal 201 send call release message for first base station transceiver 203.This call message is represented call release and is sent this call release message according to the cdma wireless agreement.This call release message sends to base station controller 301 by first base station transceiver 203.
S602, base station controller 301 sends " Notify " message to Softswitch 207.
S603, Softswitch 207 receive the deletion terminal " Notify " message after, according to interface H.248 finish and base station controller 301 between operation.
S604, base station controller 301 is deleted the transmission channel into this call setup after receiving " Subtract " order, finish operation with user terminal 201 according to the cdma wireless agreement.
S605, base station controller 301 is replied response (statistics) to Softswitch 207.
Fig. 7 is that the expression speech coding dynamically switches in the order chart that sends message between the node.As shown in the figure, may further comprise the steps:
S701, Softswitch 207 sends " Modify " order to base station controller 301, revises the RTP terminal media attribute of having set up.
S702, base station controller 301 receive " Modify " order of revising RTP terminal media attribute, judge and revise speech coding if desired, then change Traffic Channel and/or business option as required.Base station controller 301 is finished the business change flow process by base station transceiver 203 and user terminal 201, sets up necessary transmission channel.
S703, base station controller 301 is replied response message to Softswitch 207.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. wireless native loop interconnect network system comprises:
At least one base station transceiver carries out radio communication by this base station transceiver and user terminal;
Base station controller is used for the mutual conversion between the gateway control interface protocol data between Radio interface protocols data and described gateway system and the next generation network, controls described base station transceiver and is connected to next generation network;
It is characterized in that, also comprise:
Memory is read by described base station controller, is used for storaging user data therein;
Media resource processor by described base station controller control, is used to handle dual-tone multifrequency and playback.
2. wireless local access net system according to claim 1 is characterized in that described memory and media resource processor are equipped in the described base station controller.
3. wireless native loop interconnect network system according to claim 1 and 2, it is characterized in that, described memory stores is used for discerning first identifier of the described user terminal of described Radio interface protocols, be used for discerning described gateway control interface protocol described user terminal second identifier and about the data of corresponding relation between described first identifier and described second identifier.
4. the method for operation that user terminal rises to exhale in the wireless native loop interconnect network system is characterized in that, may further comprise the steps:
Step 41, described user terminal send call message to described base station controller, comprise described first identification code in the described call message;
Step 42, described base station controller is accessed in the data in the described memory, and retrieves data in the described memory according to the call message that comprises described first identification code that receives, and obtains described second identification code;
The call message that step 43, described base station controller will comprise described second identification code sends to described Softswitch;
Step 44, described base station controller control base station transceiver finish by wave point and terminal between operation;
Step 45, described Softswitch according to and wireless native loop interconnect network system between interface protocol finish and base station controller between operation.
5. the method for operation of wireless native loop interconnect network system according to claim 4 is characterized in that, also comprises:
When needs were play the bell sound, described base station controller control media resource processor was finished the step of the processing of playback.
6. according to the method for operation of claim 4 or 5 described wireless native loop interconnect network systems, it is characterized in that, also comprise the step of user terminal call release:
Step 61, described user terminal sends release message to described base station controller by described base station transceiver;
Step 62, described base station controller send first message to described Softswitch after receiving described release message;
Step 63, described Softswitch finish by corresponding gateway control protocol interface and described base station controller between operation;
Step 64, described base station controller discharges Radio Resource; With
Step 65, control that described base station transceiver is finished by wave point and described user terminal between operation.
7. according to the method for operation of claim 4 or 5 described wireless native loop interconnect network systems, it is characterized in that, also comprise the dynamic switch step of coding in the calling procedure:
Step 71, when network congestion or network condition were better, described Softswitch was confirmed to need to change encoding and decoding speech, and described Softswitch sends first message to described base station controller;
Step 72, described base station controller is finished the business change flow process, changes Traffic Channel and/or business option as required, sets up necessary transmission channel; Finish and described user terminal between business change;
Step 73, described base station controller reply response for after business change is finished described Softswitch.
8, the method for operation that user terminal is exhaled in a kind of wireless native loop interconnect network system is characterized in that, may further comprise the steps:
When step 81, described Softswitch received to user's calling, described Softswitch sent beep-page message to described base station controller, comprises described second identification code in the described beep-page message;
Step 82, the data in the described memory of described base station controller access are retrieved the data of described user terminal according to described second identification code, obtain described first identification code;
Step 83, described base station controller sends the beep-page message that comprises described first identification code to described base station transceiver, the described paging information that comprises first identification code of described base station transceiver broadcasting;
Step 84, described user terminal distinguishes it is to call out oneself, sending a reply information by described first identification code;
Step 85, described base station controller control base station transceiver finish by wave point and terminal between operation;
Step 86, described Softswitch according to and wireless native loop interconnect network system between interface protocol finish and base station controller between operation.
9. method according to claim 8 is characterized in that, also comprises the step of user terminal call release:
Step 91, described user terminal sends release message to described base station controller by described base station transceiver;
Step 92, described base station controller send first message to described Softswitch after receiving described release message;
Step 93, described Softswitch finish by corresponding gateway control protocol interface and described base station controller between operation;
Step 94, described base station controller discharges Radio Resource; With
Step 95, control that described base station transceiver is finished by wave point and described user terminal between operation.
10. method according to claim 8 is characterized in that, also comprises the dynamic switch step of coding in the calling procedure:
Step 101, when network congestion or network condition were better, described Softswitch was confirmed to need to change encoding and decoding speech, and described Softswitch sends first message to described base station controller;
Step 102, described base station controller is finished the business change flow process, changes Traffic Channel and/or business option as required, sets up necessary transmission channel; Finish and described user terminal between business change;
Step 103, described base station controller reply response for after business change is finished described Softswitch.
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| CN 200610011323 CN101022430A (en) | 2006-02-14 | 2006-02-14 | Radio local loop switch-in network system and operating method thereof |
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| CN 200610011323 CN101022430A (en) | 2006-02-14 | 2006-02-14 | Radio local loop switch-in network system and operating method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101868956A (en) * | 2007-11-23 | 2010-10-20 | 德国电信股份公司 | Method for accessing closed groups in radio access networks |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101868956A (en) * | 2007-11-23 | 2010-10-20 | 德国电信股份公司 | Method for accessing closed groups in radio access networks |
| CN101868956B (en) * | 2007-11-23 | 2013-04-24 | 德国电信股份公司 | Method for accessing closed groups in radio access networks |
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