CN100426911C - Method for maintenance of base station IPOA channel - Google Patents
Method for maintenance of base station IPOA channel Download PDFInfo
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- CN100426911C CN100426911C CNB2006101113765A CN200610111376A CN100426911C CN 100426911 C CN100426911 C CN 100426911C CN B2006101113765 A CNB2006101113765 A CN B2006101113765A CN 200610111376 A CN200610111376 A CN 200610111376A CN 100426911 C CN100426911 C CN 100426911C
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Abstract
The invention relates to a method for maintaining the IPOA channel of base station, which is characterized in that: continuously checking if the IPOA channel between the base station and base station controller is normal; when said channel is abnormal, building the default permanent virtual connection between the base station and the controller; and building IPOA channel between base station and controller on said base of default permanent virtual connection; after building the IPOA channel, going on checking. And the invention can solve the problems that when the default connection of ATM layer is unavailable, the IPOA channel can not be built; when the IPOA channel is accident, the IPOA channel can be built when the physical channel between base station and controller is connected, to improve the maintenance property of base station.
Description
Technical field
The present invention relates to wireless communication field, be specifically related to a kind of method of maintenance of base station IPOA channel.
Background technology
Base station (NODE B) has the characteristics wide, that quantity is big, the near-end management is difficult for that distribute as an important component part of wireless side in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system.In order to solve the problem of (NODEB) system remote management, in 3GPP 25.442 agreements, arrange: the passage that between base station (NODE B) and base station controller (BSC or RNC), needs to set up an IPOA (IP Over ATM), promptly based on Internet protocol (IP) transmission channel of Asynchronous Transfer Mode (ATM), so that the telemanagement of concentrating at side of base station controller.
Existing method one, the method that a kind of base station maintenance passage is set up, it is open to be disclosed on April 30th, 2003, and application number is 01136795.4 Chinese patent application, comprises step: set up the base station and be connected (PVC) with default permanent virtual between the base station controller; Connect by described default permanent virtual, Bootstrap Protocol (BOOTP) request is initiated with broadcast mode in the base station; The base station obtains the Bootstrap Protocol request responding bag that base station controller returns; Described respond packet comprises the internet protocol address of distributing to this base station; Described base station is connected establishment IPOA passage according to the internet protocol address of described distribution with default permanent virtual.
This method is finished the foundation of the OM channel between base station and the base station controller by above-mentioned steps, and according to the base station controller of configuration and the route between the base station far-end Operation and Maintenance platform, make the base station pass through described maintenance channel and be communicated with, realize the remote maintenance of maintenance console thus the base station to the maintenance channel between the Operation and Maintenance platform of far-end.
Above-mentioned existing method one provides the method for setting up OM channel between base station and the base station controller by BOOTP, but this method has an obvious defects, when the IPOA passage of creating is disabled, can't rebulid the IPOA passage and keep being communicated with of base station and base station controller, the attendant must go to the base station that resets to the near-end of base station.
For solving the defective of above-mentioned existing method, it is disclosed that the method two that existing another kind is set up the base station maintenance passage is disclosed on April 26th, 2006, and application number is 200610084095.6 Chinese invention patent application.Method two is providing a kind of after the IPOA passage is set up on the basis of said method one, the method that the IPOA passage is safeguarded, this method is by after setting up the IPOA passage, the base station constantly sends the BOOTP request according to sense cycle to base station controller, and will compare from IP address the BOOTP respond packet that base station controller obtains and current base station IP address, if different, then adopt new IP address to set up new IPOA passage.Thereby realize the reconstruction of IPOA passage.
But method two fundamentally produce in the solution one when the IPOA passage is unavailable, can't rebulid the problem that is communicated with that the IPOA passage keeps base station and base station controller, because when the IPOA passage goes wrong when can't be communicated with, if the default permanent virtual of ATM layer connects also unavailable, in the time of can not normal transmission, then this method just can't obtain the BOOTP respond packet that base station controller returns and rebulid the IPOA passage.And in fact the inefficacy of IPOA passage usually is because the default permanent virtual of ATM layer connects unavailable causing, as: because in the process that the frame of base station controller switches,, the ATM layer that operating personnel's operating mistake causes do not cause the default permanent virtual of ATM layer to be connected inefficacy because matching with physical layer.
Summary of the invention
The method that the object of the present invention is to provide a kind of base station maintenance passage to set up is applied to wireless communication technology field, and this method can realize the reconstruction after base station IPOA channel lost efficacy.
To achieve the object of the present invention, the technical scheme of being taked is: a kind of method of maintenance of base station IPOA channel comprises: whether the IPOA passage between base stations detected and the base station controller is normal; If described IPOA passage is undesired, whether then further detect described base station is connected normal with default permanent virtual between the base station controller, if it is normal that described default permanent virtual connects, then in existing default permanent virtual connection, set up the IPOA passage between base station and the base station controller;
After described IPOA passage is set up, turn to whether normal step of the IPOA passage carried out between described base stations detected and the base station controller.
Alternatively, if described IPOA passage is normal, then behind the duration that wait is preset, continue the IPOA passage normal step whether between described base stations detected and the base station controller.
Alternatively, whether the IPOA passage between described base stations detected and the base station controller normally comprises: the base station periodically sends to base station controller and detects bag, if in presetting duration, the As-received station control is not received the response that detects bag, judges that then the IPOA passage is undesired; If preset in the duration described, the As-received station control is received the response that detects bag, judges that then described IPOA passage is normal.
Alternatively, the described detection bag detection bag that is packet internet groper.
Alternatively, describedly comprise: be connected by described default permanent virtual in the process of setting up the IPOA maintenance channel between base station and the base station controller on the basis of default permanent virtual link, the base station broadcast mode is initiated the Bootstrap Protocol request, and described request is sent to base station controller; The base station obtains the Bootstrap Protocol request responding bag that base station controller returns; Described respond packet comprises the internet protocol address of distributing to this base station; Described base station is connected establishment IPOA passage according to the internet protocol address of described distribution with default permanent virtual.
Alternatively, if described default permanent virtual malunion is normal, then sets up the base station and be connected with default permanent virtual between the base station controller; On described default permanent virtual connection basis, set up the IPOA passage between base station and the base station controller.
Alternatively, further comprise: after the base station broadcast mode is initiated the Bootstrap Protocol request, if in the duration that presets, the base station does not obtain the Bootstrap Protocol request responding bag that base station controller returns, then send the Bootstrap Protocol request once more, obtain Bootstrap Protocol request responding bag until the base station.
Alternatively, describedly comprise: be connected by described existing default permanent virtual in the process of setting up the IPOA passage between base station and the base station controller on the existing default permanent virtual connection basis, the base station broadcast mode is initiated the Bootstrap Protocol request, and described request is sent to base station controller; The base station obtains the Bootstrap Protocol request responding bag that the Operation and Maintenance platform of base station controller returns; Described respond packet comprises the internet protocol address of distributing to this base station; Described base station is connected establishment IPOA passage according to the internet protocol address of described distribution with default permanent virtual.
Alternatively, the described base station of described detection is connected with default permanent virtual between the base station controller whether normal processes comprises: the base station periodically sends the Bootstrap Protocol request with broadcast mode, if in presetting duration, the base station is the described Bootstrap Protocol request responding bag that returns of As-received station control not, and it is unusual to judge that then default permanent virtual connects; If preset in the duration described, the described Bootstrap Protocol request responding bag that base station As-received station control returns, it is normal to judge that then default permanent virtual connects; The described process of setting up the IPOA passage between base station and the base station controller on existing default permanent virtual connection basis comprises: the internet protocol address of distributing in the respond packet that the base station is returned according to described base station controller is connected establishment IPOA passage with described default permanent virtual.
Adopt technique scheme, beneficial technical effects of the present invention is:
Whether the present invention is normal by the IPOA passage between continuous detecting base station and the base station controller; When described IPOA passage is undesired, then rebulid the IPOA passage between described base station and the base station controller.Solved in the prior art, when the default permanent virtual of ATM layer connects disabled the time, can't rebulid the problem of IPOA passage, when the IPOA channel failure, as long as the base station keeps being communicated with the base station controller physical link, just can rebulid the IPOA passage, reduce the base station becomes isolated island on network probability, improve the maintainability of base station.
Description of drawings
Fig. 1 is the flow chart of the method for the embodiment of the invention one maintenance of base station IPOA channel;
Fig. 2 is that the present invention connects the flow chart of setting up the IPOA passage on the basis in the default permanent virtual of setting up;
Fig. 3 is the flow chart of the method for the embodiment of the invention two maintenance of base station IPOA channel;
Fig. 4 is that the present invention connects the flow chart of setting up the IPOA passage on the basis in existing default permanent virtual;
Fig. 5 is the flow chart of the method for the embodiment of the invention three maintenance of base station IPOA channel.
Embodiment
The object of the present invention is to provide a kind of method of maintenance of base station IPOA channel, its core concept is abnormal by the IPOA passage between continuous detecting base station and the base station controller; When described IPOA passage is undesired, then sets up the base station and be connected with default permanent virtual between the base station controller; And on the basis of described default permanent virtual link, set up IPOA passage between described base station and the base station controller, after described IPOA passage is set up, continue to carry out and detect.Solved in the prior art, when the default permanent virtual of ATM layer connects disabled the time, can't rebulid the problem of IPOA passage, when the IPOA channel failure, as long as the base station keeps being communicated with the base station controller physical link, just can rebulid the IPOA passage, reduce the base station becomes isolated island on network probability, improve the maintainability of base station.Method to a kind of maintenance of base station IPOA channel provided by the invention is described in detail below.
The method of embodiment one, a kind of maintenance of base station IPOA channel, flow chart comprise as shown in Figure 1:
101, whether the IPOA passage between base stations detected and the base station controller is normal, if normal, then turns to step 102; If undesired, then turn to step 103.
In the present embodiment, the base station periodically sends to base station controller and detects bag, if in presetting duration, not As-received station control response judges that then the IPOA passage is undesired; If preset in the duration described, the As-received station control is received the response that detects bag, judge that then described IPOA passage is normal, be understandable that, can also adopt other detection modes, for example send the request of detection etc. by side of base station controller, the abnormal condition of judgement passage also for example can be taked, do not receive respond packet yet after sending the detection bag that presets number of times continuously, it is undesired then to be judged as.
In the present embodiment, described detection adopts packet internet groper (Ping:Packet Internet Groper) to carry out, described detection bag is that Ping detects bag, and Ping is that test network connects situation and packets of information sends and the very useful instrument of reception situation, is the most frequently used order of network test.Ping sends an echo request packet to destination host/address, answer after requiring destination host to receive request, thereby judge whether the response time of network and this machine are communicated with destination host/address, because the IPOA passage is based on the transmission channel of IP, thus utilize the Ping mode effectively base stations detected whether be communicated with IPOA passage between the base station controller.
The present invention can also adopt by the base station and regularly send the BOOTP request to base station controller, if in scheduled duration, the respond packet of the described request that described base station controller returns is received in the base station, and the IP address that comprises in this respond packet is identical with the base station local ip address, then can judge the IPOA channel connection between this base station and the base station controller.Be understandable that, the existing mode that detection mode of the present invention can also adopt other detects the connectedness of IPOA passage, the difference of the network equipment that provides according to each manufacturer, detection mode can be taked suitable mode as the case may be, and concrete detection mode is not construed as limiting the invention.
102, behind the duration that wait is preset, turn to step 101.
103, set up the base station and be connected with default permanent virtual between the base station controller.
When the present invention specifically implements, set up physical layer between base station and the base station controller and be connected, at first the state of base station side by the inquiry physical link obtains current normal physical link (E1/T1) number; After obtaining current normal physical link, the ATM layer link of base station side deleted in the base station on this physical link, makes no ATM carrying on this physical link; Afterwards, base station side is initiated inverse multiplexing (IMA)/single-link (UNI) link and is intercepted, and obtains the ATM layer Linktype and the parameter of base station controller; Base station side is by the ATM layer Linktype that obtain and the ATM layer link of parameter configuration base station; After ATM layer link configuration finished, the base station was set up default permanent virtual and is connected on the ATM layer.
In the present embodiment, by this step build a station with base station controller between default permanent virtual be connected, solved in the prior art, when the default permanent virtual of ATM layer connects disabled the time, can't rebulid the problem of IPOA passage.
104, on the basis of described default permanent virtual link, set up between base station and the base station controller IPOA passage and turn to step 101.
Seeing also Fig. 2, is the present invention sets up the IPOA passage between base station and the base station controller on the basis of described default permanent virtual link flow chart, specifically comprises:
201, by the default permanent virtual connection of described foundation, the base station broadcast mode is initiated the Bootstrap Protocol request, and described request is sent to base station controller.
202, the base station obtains the Bootstrap Protocol request responding bag that base station controller returns; Described respond packet comprises the IP address of distributing to this base station.
Among the present invention, if in the duration that presets, the base station does not obtain the Bootstrap Protocol request responding bag that base station controller returns, then send the Bootstrap Protocol request once more, obtain Bootstrap Protocol request responding bag until the base station, use this periodic broadcast to send the mechanism that BOOTP asks, but the problem that the BOOTP protocol package of having avoided the ATM cell disposability to bring may be lost, guarantee that the base station reliably obtains local ip address timely, thereby guarantee the success that the IPOA passage is set up.
203, described base station is connected with default permanent virtual according to IP address allocated in the described respond packet creates the IPOA passage.
For base station controller, can be to come address to base station assigns IP by base station controller main frame or its Operation and Maintenance platform.
If the Operation and Maintenance platform distributing IP address of base station controller, the base station controller main frame listens to the next BOOTP request in base station so, this BOOTP request package need be delivered to the Operation and Maintenance platform of base station controller, and the Operation and Maintenance platform that guarantees base station controller can to discern this BOOTP request package be the request that send which base station, thereby give its distributing IP address.Therefore, if this Operation and Maintenance platform is the outside at the base station controller main frame, and process IP network between the base station controller main frame, the Operation and Maintenance platform of base station controller is that to distinguish this BOOTP request package according to the client hardware address in the BOOTP request package of receiving be the request that send which base station so, thereby gives its distributing IP address.Client hardware address is consistent in the BOOTP request package of base station controller main frame because the base station sends to, therefore need the base station controller main frame that the BOOTP request package is done some processing, the client hardware address of revising the BOOTP request package identifies each different base station, is the BOOTP request that send which base station so that the Operation and Maintenance platform of base station controller can be discerned.For example: in the client hardware address of BOOTP bag, add the information such as PVC that expression is connected with this base station at base station controller.The BOOTP response that will guarantee the Operation and Maintenance platform response of base station controller in addition can be returned base station side, gives the IP address of base station assigns thereby the base station obtains the Operation and Maintenance platform of base station controller.Also can obtain information such as loading procedure filename and path as required in the reality.
If the host function module of base station controller is distributed the IP address of base station, the bottom functional module client hardware address that need revise BOOTP bag identifies each different base station so, for example adds the information such as PVC that expression is connected with this base station in the client hardware address of BOOTP bag.Distribute IP address, base station functional module can according in advance Already in side of base station controller be used for this base station operation and safeguard that the relation between the PVC of client hardware address of the configuration of IPOA passage and BOOTP request package finds the opposite equip. IP address of this IPOA, thereby distribute the IP address of base station.The IPOA passage is created according to the IP address that obtains in the base station.After IPOA passage between base station side and the base station controller is set up, on this passage, just can load the program and the data of base station.Be connected when having set up IPOA by top described mode between base station and the base station controller, at the relevant route data of this side of base station controller configuration, make that route can reach between base station and its base station maintenance platform, that is to say that the IP tunnel that arrives between its base station maintenance platform the base station is unimpeded.But this moment, the base station also not and set up direct message communicating between the base station maintenance platform, the IP address of the corresponding maintenance console in this base station is not also known in the base station.How the base station obtains the IP address of corresponding maintenance console, how about initiates the request of program or data, can be solved according to own equipment actual conditions design by each base station equipment manufacturer.
Whether the embodiment of the invention one is normal by the IPOA passage between continuous detecting base station and the base station controller; When described IPOA passage is undesired, then rebulid the IPOA passage between described base station and the base station controller.Solved in the prior art,, can't rebulid the problem of IPOA passage when the default permanent virtual of ATM layer connects disabled the time.When the IPOA channel failure, as long as the maintenance of base station and base station controller physical link is communicated with, just can rebulid the IPOA passage, reduced the base station becomes isolated island on network probability, improved the maintainability of base station.
Embodiment two, a kind of method of maintenance of base station IPOA channel, and flow chart comprises as shown in Figure 3: 301, whether the IPOA passage between base stations detected and the base station controller is normal, if normal, then turns to step 302; If undesired, then turn to step 303.
In the present embodiment, the Ping mode is adopted in described detection, and described detection bag is that Ping detects bag, and concrete detection mode is referring to the step 101 of embodiment one.
302, behind the duration that wait is preset, turn to step 301.
303, detect described base station and whether normal be connected with default permanent virtual between the base station controller, if normal, then turn to step 304; If undesired, then turn to step 305.
Whether the present invention judges that the base station is connected with default permanent virtual between the base station controller and normally can judge according to alarming mechanism, general base station side is supported alarming mechanism, when described default permanent virtual connection can't be communicated with, can produce warning information, prompting ATM layer is unavailable.Concrete detection method can take existing multiple usual manner to carry out according to actual conditions, and concrete detection mode is not construed as limiting the invention.
304, on existing default permanent virtual connection basis, set up the IPOA passage between base station and the base station controller, and turn to step 301.
Seeing also Fig. 4, is the flow chart of setting up the IPOA passage on existing default permanent virtual connection basis, comprising:
401, connect by described existing default permanent virtual, the base station broadcast mode is initiated the Bootstrap Protocol request, and described request is sent to base station controller.
402, the base station obtains the Bootstrap Protocol request responding bag that base station controller returns; Described respond packet comprises the IP address of distributing to this base station.
If in the time of setting, the base station does not obtain the Bootstrap Protocol request responding bag that base station controller returns, and then sends the Bootstrap Protocol request once more, obtain Bootstrap Protocol request responding bag until the base station.
For base station controller, can be to come address to base station assigns IP by base station controller main frame or its Operation and Maintenance platform.
403, the base station is connected with default permanent virtual according to the internet protocol address of distributing in the described respond packet creates the IPOA passage.
305, set up the base station and be connected with default permanent virtual between the base station controller.
306, on the basis of described default permanent virtual link, set up the IPOA passage between described base station and the base station controller, and turn to step 301.
The process of specifically on the basis of described default permanent virtual link, setting up the IPOA passage between described base station and the base station controller referring to step 201 to 203.
The embodiment of the invention two is with the difference of embodiment one, the step that further increases to ATM break province permanent virtual connection judgment, if existing default permanent virtual connection status is normal, then needn't rebulid, directly on this default permanent virtual connection basis, set up the IPOA passage, simplified flow process, made the cycle of rebuilding the IPOA passage shorter, speed is faster.
Embodiment three, a kind of method of maintenance of base station IPOA channel, and flow chart comprises as shown in Figure 5: 501, whether the IPOA passage between base stations detected and the base station controller is normal, if then turn to step 502; If not, then turn to step 503.
In the present embodiment, the Ping mode is adopted in described detection, and described detection bag is that Ping detects bag, and concrete detection mode is referring to the specific descriptions of the step 101 of embodiment one.
502, behind the duration that wait is preset, turn to step 501.
503, the base station periodically sends the Bootstrap Protocol request with broadcast mode.
504, judge that the respond packet that the base station described Bootstrap Protocol whether the As-received station control returns is asked clearly is if then turn to step 505 in presetting duration; If not, then turn to step 506.
If in presetting duration, the As-received station control is not received described Bootstrap Protocol request responding bag, and it is unusual to judge that then default permanent virtual connects; If preset in the duration described, the As-received station control is received described Bootstrap Protocol request responding bag, and it is normal to judge that then default permanent virtual connects.
505, the internet protocol address of distributing in the respond packet that the base station is returned according to described base station controller is connected with existing default permanent virtual creates the IPOA passage.
For base station controller, can be to come address to base station assigns IP by base station controller main frame or its Operation and Maintenance platform.
506, set up the base station and be connected with default permanent virtual between the base station controller.
507, on the basis of the default permanent virtual link of described foundation, set up the IPOA passage between described base station and the base station controller, and turn to step 501.
The process between base station and the base station controller specifically set up referring to step 201 to 203.
The embodiment of the invention three is with the difference of embodiment two, judge by the process that sends BOOTP request and response whether normal the base station is connected with default permanent virtual between the base station controller, if it is normal, then directly rebulid IPOA passage between base station and the base station controller according to the IP address of distributing to the base station of carrying in this BOOTP respond packet, further simplified whole flow process, make the cycle of rebuilding the IPOA passage shorter, speed is faster.
More than the method for a kind of maintenance of base station IPOA channel provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. the method that safeguard based on the Internet protocol transmission IPOA passage of Asynchronous Transfer Mode the base station is characterized in that, comprising:
Whether the IPOA passage between base stations detected and the base station controller is normal;
If described IPOA passage is undesired, whether then further detect described base station is connected normal with default permanent virtual between the base station controller, if it is normal that described default permanent virtual connects, then on existing default permanent virtual connection basis, set up the IPOA passage between base station and the base station controller;
After described IPOA passage is set up, turn to whether normal step of the IPOA passage carried out between described base stations detected and the base station controller.
2. the method for maintenance of base station IPOA channel as claimed in claim 1 is characterized in that, if described IPOA passage is normal, then behind the duration that wait is preset, continues the IPOA passage normal step whether between described base stations detected and the base station controller.
3. the method for maintenance of base station IPOA channel as claimed in claim 2 is characterized in that, whether the IPOA passage between described base stations detected and the base station controller normally comprises:
The base station periodically sends to base station controller and detects bag, if in presetting duration, the As-received station control is not received the response that detects bag, judges that then the IPOA passage is undesired; If preset in the duration described, the As-received station control is received the response that detects bag, judges that then described IPOA passage is normal.
4. the method for maintenance of base station IPOA channel as claimed in claim 3 is characterized in that, the detection bag that described detection bag is a packet internet groper.
5. as the method for any described maintenance of base station IPOA channel of claim 1 to 4, it is characterized in that,, then set up the base station and be connected with default permanent virtual between the base station controller if described default permanent virtual malunion is normal; On described default permanent virtual connection basis, set up the IPOA passage between base station and the base station controller.
6. the method for maintenance of base station IPOA channel as claimed in claim 5 is characterized in that, the described process of setting up the IPOA maintenance channel between base station and the base station controller on the basis of default permanent virtual link comprises:
Connect by described default permanent virtual, the base station broadcast mode is initiated the Bootstrap Protocol request, and described request is sent to base station controller;
The base station obtains the Bootstrap Protocol request responding bag that base station controller returns; Described respond packet comprises the internet protocol address of distributing to this base station;
Described base station is connected establishment IPOA passage according to the internet protocol address of described distribution with default permanent virtual.
7. the method for maintenance of base station IPOA channel as claimed in claim 6, it is characterized in that, further comprise: after the base station broadcast mode is initiated the Bootstrap Protocol request, if in the duration that presets, the base station does not obtain the Bootstrap Protocol request responding bag that base station controller returns, then send the Bootstrap Protocol request once more, obtain Bootstrap Protocol request responding bag until the base station.
8. the method for maintenance of base station IPOA channel as claimed in claim 1 is characterized in that, the described process of setting up the IPOA passage between base station and the base station controller on existing default permanent virtual connection basis comprises:
Connect by described existing default permanent virtual, the base station broadcast mode is initiated the Bootstrap Protocol request, and described request is sent to base station controller;
The base station obtains the Bootstrap Protocol request responding bag that the Operation and Maintenance platform of base station controller returns; Described respond packet comprises the internet protocol address of distributing to this base station;
Described base station is connected establishment IPOA passage according to the internet protocol address of described distribution with default permanent virtual.
9. the method for maintenance of base station IPOA channel as claimed in claim 1, it is characterized in that, the described base station of described detection is connected with default permanent virtual between the base station controller whether normal processes comprises: the base station periodically sends the Bootstrap Protocol request with broadcast mode, if in presetting duration, the base station is the described Bootstrap Protocol request responding bag that returns of As-received station control not, and it is unusual to judge that then default permanent virtual connects; If preset in the duration described, the described Bootstrap Protocol request responding bag that base station As-received station control returns, it is normal to judge that then default permanent virtual connects;
The described process of setting up the IPOA passage between base station and the base station controller on existing default permanent virtual connection basis comprises:
The internet protocol address of distributing in the respond packet that the base station is returned according to described base station controller is connected with described default permanent virtual creates the IPOA passage.
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| CN1909712A (en) | 2007-02-07 |
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