CN101895855B - Access method, base station and access system of mobile terminal - Google Patents

Abstract

The invention discloses an access method of a mobile terminal, which comprises the following steps: judging whether the terminal identification of the mobile terminal which is currently requested to be accessed and is allocated with the independent dedicated control channel SDCCH is positioned in a stored blacklist database or not; if yes, rejecting the access request initiated by the mobile terminal; if not, authenticating the mobile terminal; when the authentication fails, rejecting the access request initiated by the mobile terminal; and when the authentication is successful, accepting the access request initiated by the mobile terminal. The invention also discloses a base station and an access system. The invention can save network resources.

Description

Access method, base station and access system of mobile terminal

technical field

The present invention relates to the field of communication technology, in particular to a mobile terminal access method, a base station and an access system.

Background technique

When a mobile terminal (Mobile Station, MS) initiates a service application to the network, it first initiates a request on a random access channel (Random Access Channel, RACH), and dynamically sends a random access pulse to a base station (Base Transceiver) on the RACH. Station, BTS) initiates a channel request message to apply for a channel. The reason for channel application is included in the channel request message, which may be "response to paging", "emergency call", "mobile calling", "short message service", or other services, such as "location update", and so on. In addition, the channel request message also includes a random parameter for distinguishing different MSs. For example, when the MS randomly selects 5 bits as the random parameter, it can distinguish up to 32 MSs at the same time.

After sending the channel request message, the MS searches the 30 radio frequency channels (Radio Frequency, RF) with the strongest signal. If no suitable cell is found, the MS will continue to detect the signal strength of all RF channels and search for the cell selection parameter C1> 0 and the broadcast control channel (Broadcast Control Channel, BCCH) that is not prohibited from being accessed. When a qualified channel is found, the MS selects the cell where the channel is located, without considering the Public Land Mobile Network (PLMN) ) identification.

When disasters such as natural disasters occur, due to large-scale damage to ground base stations, high-altitude base stations are usually used to connect services. However, the number of high-altitude base stations is small, generally located several hundred meters above the ground, and omnidirectional antennas are used to provide all-round coverage to the ground. coverage, the coverage radius will reach tens of kilometers. At this time, a large number of MSs will try to access the same high-altitude base station, and apply for access to the Global System for Mobile communication (GSM) through the high-altitude base station. Among these MSs, there are not only users of this network, but also users of other networks. Users, users on this network include not only users who can access GSM for roaming, but also users who are not allowed to roam. In this way, there will be a phenomenon that a separate dedicated control channel (Separate Dedicated Control Channel, SDCCH) channel is congested and the MS cannot access it. The specific flow of the MS accessing the high-altitude base station in the prior art is shown in Figure 1:

Step 101, the MS initiates a channel request message Channel Request on the RACH;

Step 102, the BTS forwards the channel request message initiated by the MS to the Base Station Controller (Base Station Center, BSC);

Step 103, BSC sends channel activation message Channel Activation to BTS;

Step 104, BTS feeds back Channel Activation Ack to BSC;

Step 105, the BSC issues an Immediate AssignmentCommand to the BTS to immediately assign a channel command;

Step 106, the BTS immediately assigns the SDCCH to the MS through an Access Grant Channel (AGCH);

Step 107, the MS initiates a connection management (Connection Management, CM) service request on the allocated SDCCH;

Step 108, the BTS forwards the CM service request initiated by the MS to the base station controller;

Step 109, the BSC forwards the CM service request to the Mobile Switching Center (Mobile Switching Control, MSC);

Step 110, the BTS feeds back an unnumbered acknowledgment frame (UnnumberedAcknowledgment, UA) to the MS through the SDCCH;

Step 111, MSC sends Authentication Request to BSC;

Step 112, the BSC sends an authentication request to the MS through the SDCCH;

Step 113, the MS feeds back an Authentication Response to the BSC through the SDCCH;

Step 114, the BSC feeds back the authentication response to the MSC;

Step 115, MSC issues Ciphering Mode Command to BSC;

Step 116, BSC forwards the encryption mode command to BTS;

Step 117, the BTS forwards the encryption mode command to the MS through the SDCCH;

Step 118, the MS sends the encryption mode end message Ciphering ModeComplete to the BSC through the SDCCH;

Step 119, the BSC forwards the encryption mode end message to the MSC;

Step 120, the MSC issues a Temporary Mobile Station Identity (TMSI) reallocation instruction to the BSC;

Step 121, the BSC forwards the TMSI reallocation instruction to the MS through the SDCCH;

Step 122, the MS notifies the BSC of the end of the TMSI reallocation through the SDCCH;

Step 123, the BSC notifies the MSC that the TMSI reallocation is completed;

Step 124, the establishment is successful.

If the MS authentication fails, the network will send an authentication failure message to the MS through the BTS, and release the allocated SDCCH channel, and the MS will no longer initiate access requests within a certain period of time. Initiate an access request.

When a disaster occurs, a large number of MSs will initiate access requests on the same high-altitude base station. When there is an idle SDCCH, the high-altitude base station will allocate an SDCCH for each MS. Users on other networks or users whose roaming is prohibited on this network will be rejected during authentication. , after the T3122 timeout, the rejected user will continue to initiate the request. This repeated attempt is prone to SDCCH congestion and the traffic channel (Traffic Channel, TCH) is idle, which may cause the signal to be unreachable and increase the burden on the network .

Furthermore, from allocating the SDCCH to the MS to rejecting the MS's access request after the MSC fails to authenticate, the process needs to occupy ABIS and A interface resources, and requires processing time, which also increases the burden on the network.

Contents of the invention

An embodiment of the present invention provides an access method for a mobile terminal, which is used to save network resources. The method includes:

Judging whether the terminal identification of the mobile terminal that currently requests access and has been allocated an independent dedicated control channel SDCCH is located in the saved blacklist database;

If so, rejecting the access request initiated by the mobile terminal;

If not, then perform authentication on the mobile terminal; when the authentication fails, reject the access request initiated by the mobile terminal, and when the cause of the authentication failure belongs to the set adding blacklist database condition, add the The terminal identification of the mobile terminal is added to the blacklist database; when the authentication is successful, the access request initiated by the mobile terminal is accepted.

The embodiment of the present invention also provides a base station for saving network resources, including:

The first judging module is used to judge whether the terminal identification of the mobile terminal that currently requests access and has been allocated an independent dedicated control channel SDCCH is located in the saved blacklist database;

A notification module, configured to notify the Mobile Switching Center MSC to authenticate the mobile terminal when the judgment result of the first judgment module is No;

The first receiving module is configured to receive the authentication result sent by the MSC;

An access module, configured to accept an access request initiated by the mobile terminal when the MSC authentication is successful;

A rejection module, configured to reject the access request initiated by the mobile terminal when the judgment result of the first judgment module is yes, or when the MSC authentication fails;

An adding module, configured to add the terminal identifier of the mobile terminal to the blacklist database when the reason for authentication failure received by the first receiving module belongs to the set blacklist database addition condition.

The embodiment of the present invention also provides an access system for saving network resources, including MSC and base station;

The base station is used to judge whether the terminal identification of the mobile terminal that currently requests access and has been allocated an independent dedicated control channel SDCCH is located in the saved blacklist database; if so, reject the access request initiated by the mobile terminal; if No, notify the MSC to authenticate the mobile terminal, and receive the authentication result sent by the MSC; when the authentication fails, reject the access request initiated by the mobile terminal, and when the authentication failure reason Adding the terminal identification of the mobile terminal to the blacklist database when it belongs to the set adding blacklist database condition; when the authentication is successful, accepting the access request initiated by the mobile terminal;

The MSC is configured to receive the notification of authenticating the mobile terminal sent by the base station, perform authentication on the mobile terminal, and send an authentication result to the base station.

In the embodiment of the present invention, a blacklist database is added to judge whether the terminal identification of the mobile terminal that currently requests access and has been allocated an independent dedicated control channel SDCCH is located in the saved blacklist database, and if so, can directly reject the mobile terminal to initiate The access request does not need to be authenticated again, which simplifies the authentication process for other network users and local network users who do not allow roaming, can quickly release occupied network resources, shorten processing time, and reduce the burden on the network.

Description of drawings

Fig. 1 is the flow chart of mobile terminal access high-altitude base station in the background technology;

Fig. 2 is a flowchart of an access method of a mobile terminal in an embodiment of the present invention;

FIG. 3 is a flowchart of a mobile terminal accessing a network in an embodiment of the present invention;

FIG. 4, FIG. 5, and FIG. 6 are structural schematic diagrams of base stations in embodiments of the present invention;

Fig. 7 is a schematic structural diagram of an access system in an embodiment of the present invention.

Detailed ways

In order to solve the SDCCH congestion problem mentioned in the prior art and save network resources, an embodiment of the present invention provides a method for accessing a mobile terminal. The specific process is shown in Figure 2, including:

Step 201, judging whether the terminal identification of the mobile terminal that currently requests access and has been allocated an SDCCH is located in the saved blacklist database, if not, perform step 202, if so, perform step 205;

Step 202, authenticating the mobile terminal;

Step 203, determine whether the authentication is successful, if so, execute step 204, if not, execute step 205;

Step 204, accepting the access request initiated by the mobile terminal;

Step 205, rejecting the access request initiated by the mobile terminal.

Flow process as shown in Figure 2, before step 201 is implemented, receive the access request that mobile terminal MS initiates, judge whether there is idle SDCCH at present, if yes, allocate an SDCCH for this MS, if not, then this MS is in waiting state, Wait until the timeout ends.

The process shown in Figure 2, when step 201 is implemented, a blacklist database is added, and the terminal identification of the MS that refuses to access is recorded in the blacklist database, and the identity of the MS that currently requests access and has been allocated an SDCCH is judged. Whether the terminal ID is in the saved blacklist database.

In one embodiment, the terminal identifiers of the MS recorded in the blacklist database can be of various types. Preferably, the temporary mobile subscriber identity code TMSI number and/or international mobile subscriber identification number of the MS that refuses access can be recorded in the blacklist database. Identification code IMSI number. At this time, when the access request initiated by the MS is received, it is judged whether the TMSI number and/or IMSI number of the MS is recorded in the blacklist database.

The process described in Figure 2, when step 203 is implemented, after the authentication fails, further determine the reason for the authentication failure. There are many reasons for the authentication failure, such as unknown mobile terminal, unknown location area, not allowed Any one of roaming, illegal mobile terminal, illegal device, and system failure, or a combination of several of them, and the specific failure reason depends on the actual situation. During implementation, the illegal mobile terminal or illegal device may be a mobile terminal or device that does not belong to the network.

If the cause of the authentication failure belongs to the set adding condition to the blacklist database, the terminal identification of the mobile terminal is added to the blacklist database. In this example, the set conditions for adding to the blacklist database are: local network mobile terminals or illegal mobile terminals or illegal devices that are not allowed to roam.

In this example, the blacklist database can be updated at any time according to the authentication result. In order to ensure the validity and accuracy of the blacklist database and avoid adding the terminal identifiers of MSs that can be accessed into the blacklist database, the initial blacklist database Records can be empty.

During implementation, the blacklist database is located on the network side and can be stored on any network element on the network side. It only needs to record the terminal identification of the MS. In this example, the blacklist database can be stored on the base station.

As shown in Figure 2, when step 205 is implemented, after rejecting the access request initiated by the MS, the MS will not initiate an access request within a certain period of time (such as T3122), but after the timeout, the MS will initiate an access request again. input request.

When a large number of MSs initiate access requests on the same high-altitude base station, the network side does not need to perform authentication for MSs whose terminal identities are recorded in the blacklist database and have been assigned SDCCHs, and directly rejects the access requests initiated by the above MSs, and will The release of the SDCCH allocated by the MS shortens the occupation time of the SDCCH, which can alleviate the congestion problem of the SDCCH and save network resources.

During implementation, in order to save network resources, the blacklist database can also record the time when the terminal identification of the MS is added to the blacklist database. When the terminal identification of the MS exists in the blacklist database for more than the set time , deleting the terminal identifier of the mobile terminal from the blacklist database.

Now take the TMSI or IMSI number of the MS stored in the blacklist database as an example for illustration. At this time, the specific processing flow of the MS trying to access the network is shown in Figure 3:

Step 301, receiving an access request initiated by the MS;

Step 302, judging whether there is an idle SDCCH at present, if so, execute step 303, if not, return to step 302;

Step 303, assigning an SDCCH to the MS;

Step 304, judging whether the TMSI or IMSI number of the MS is in the blacklist database, if not, execute step 305, if not, execute step 311;

Step 305, the MSC authenticates the MS;

Step 306, judging whether the authentication is successful, if not, execute step 307, if not, execute step 310;

Step 307, determining the reason for authentication failure;

Step 308, judging whether the reason for authentication failure belongs to the set blacklist database condition, if so, execute step 309, if not, execute step 311;

Step 309, adding the TMSI number or IMSI number of the MS into the blacklist database;

Step 310, accepting the access request initiated by the MS;

Step 311, rejecting the access request initiated by the MS;

Step 312, after waiting for T3122 to time out, return to step 301.

In this example, the set conditions for adding to the blacklist database are: mobile terminals on the local network or illegal mobile terminals or illegal devices that are not allowed to roam.

Based on the same inventive concept, an embodiment of the present invention also provides a base station, as shown in Figure 4, including:

The first judging module 401 is used to judge whether the terminal identification of the mobile terminal that currently requests access and has been allocated an independent dedicated control channel SDCCH is located in the saved blacklist database;

The notification module 402 is used to notify the mobile switching center MSC to authenticate the mobile terminal when the judgment result of the first judgment module 401 is no;

The first receiving module 403 is configured to receive the authentication result sent by the MSC;

An access module 404, configured to accept an access request initiated by the mobile terminal when the MSC authentication is successful;

The rejection module 405 is configured to reject the access request initiated by the mobile terminal when the judgment result of the first judgment module 401 is yes, or when the MSC authentication fails.

In one embodiment, as shown in FIG. 5, the base station may further include:

The second receiving module 501 is configured to receive an access request initiated by a mobile terminal;

The second judging module 502 is used to judge whether there is currently an idle SDCCH;

The allocation module 503 is configured to allocate an SDCCH to the mobile terminal when there is currently an idle SDCCH.

In one embodiment, as shown in FIG. 6, the base station may further include:

The adding module 601 is used to add the terminal identification of the mobile terminal to the blacklist database when the reason for the authentication failure received by the first receiving module 403 belongs to the set adding blacklist database condition

Based on the same inventive concept, an embodiment of the present invention also provides an access system, as shown in FIG. 7 , including an MSC 701 and a base station 702;

The base station 702 is used to judge whether the terminal identification of the mobile terminal that currently requests access and has been allocated an independent dedicated control channel SDCCH is located in the saved blacklist database; if so, reject the access request initiated by the mobile terminal; if not, Then notify the MSC 701 to authenticate the mobile terminal, and receive the authentication result sent by the MSC 701; when the authentication fails, reject the access request initiated by the mobile terminal; when the authentication succeeds, accept the access request initiated by the mobile terminal access request;

The MSC 701 is configured to receive the notification of authenticating the mobile terminal sent by the base station 702, and authenticate the mobile terminal; and send the authentication result to the base station 702.

In one embodiment, the base station 702 can also be used to: receive an access request initiated by a mobile terminal; determine whether there is an idle SDCCH, and if so, allocate an SDCCH to the mobile terminal.

In an embodiment, the base station 702 can also be used to: add the terminal identifier of the mobile terminal to the blacklist database when the cause of the authentication failure belongs to the set blacklist database addition condition

In the embodiment of the present invention, a blacklist database is added to judge whether the terminal identification of the mobile terminal that currently requests access and has been allocated an independent dedicated control channel SDCCH is located in the saved blacklist database, and if so, can directly reject the mobile terminal to initiate The access request does not need to be authenticated again, which simplifies the authentication process for other network users and local network users who do not allow roaming, can quickly release occupied network resources, shorten processing time, and reduce the burden on the network.

Further, when the authentication failure reason belongs to the set adding blacklist database condition, then the terminal identification of the mobile terminal is added in the blacklist database, so as to ensure that the content stored in the blacklist database can be updated in time and improve the accuracy of authentication .

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their technical equivalents, the present invention also intends to include these modifications and variations.

Claims (7)

1. An access method for a mobile terminal, comprising: receiving an access request initiated by a mobile terminal; Judging whether there is currently an idle independent dedicated control channel SDCCH, if so, assigning an SDCCH to the mobile terminal; Judging whether the terminal identification of the mobile terminal that currently requests access and has been allocated an SDCCH is located in the saved blacklist database; If the terminal identifier of the mobile terminal is located in the saved blacklist database, rejecting the access request initiated by the mobile terminal, and releasing the SDCCH allocated for the mobile terminal; If the terminal identification of the mobile terminal is not located in the saved blacklist database, the mobile terminal is authenticated; when the authentication fails, the access request initiated by the mobile terminal is rejected, and the reason for the authentication failure is Adding the terminal identifier of the mobile terminal into the blacklist database when it belongs to the set blacklist database addition condition; when the authentication is successful, accepting the access request initiated by the mobile terminal. 2 . The method according to claim 1 , wherein the set conditions for adding to the blacklist database include: mobile terminals on the local network or illegal mobile terminals or illegal devices that are not allowed to roam. 3. The method according to any one of claims 1 to 2, wherein the temporary mobile subscriber identity TMSI number and/or international mobile subscriber identity number of the mobile terminal that refuses access is recorded in the blacklist database IMSI number. 4. The method according to claim 3, wherein the time when the terminal identification of the mobile terminal is added to the blacklist database is also recorded in the blacklist database, when the terminal identification of the mobile terminal is in the blacklist database When the existence time in the blacklist database exceeds the set time, delete the terminal identification of the mobile terminal from the blacklist database. 5. The method of claim 4, wherein the blacklist database is located in a base station. 6. A base station, characterized in that it comprises a first judging module, a notification module, a first receiving module, an access module, a rejection module, a joining module, a second receiving module, a second judging module and an assignment module, wherein: The second receiving module is configured to receive an access request initiated by a mobile terminal; The second judging module is used to judge whether there is currently an idle independent dedicated control channel SDCCH; An allocation module, configured to allocate an SDCCH to the mobile terminal when there is currently an idle SDCCH; The first judging module is used to judge whether the terminal identification of the mobile terminal that currently requests access and has been allocated the SDCCH is located in the saved blacklist database; A notification module, configured to notify the Mobile Switching Center MSC to authenticate the mobile terminal when the judgment result of the first judgment module is No; The first receiving module is configured to receive the authentication result sent by the MSC; An access module, configured to accept an access request initiated by the mobile terminal when the MSC authentication is successful; A rejection module, configured to reject the access request initiated by the mobile terminal when the judgment result of the first judgment module is yes, and release the SDCCH allocated for the mobile terminal, or when the MSC authentication fails , rejecting the access request initiated by the mobile terminal; An adding module, configured to add the terminal identifier of the mobile terminal to the blacklist database when the reason for authentication failure received by the first receiving module belongs to the set blacklist database addition condition. 7. An access system, characterized in that it comprises: a mobile switching center MSC and a base station; The base station is used to receive an access request initiated by a mobile terminal, and determine whether there is currently an idle independent dedicated control channel SDCCH, and if so, allocate an SDCCH for the mobile terminal, and determine that the current request for access has been allocated to an SDCCH Whether the terminal identifier of the mobile terminal is located in the saved blacklist database, if the terminal identifier of the mobile terminal is located in the saved blacklist database, the access request initiated by the mobile terminal is rejected, and the mobile terminal is released SDCCH allocated; if the terminal identification of the mobile terminal is not located in the saved blacklist database, then notify the MSC to authenticate the mobile terminal and receive the authentication result sent by the MSC; when the authentication fails , reject the access request initiated by the mobile terminal, and add the terminal identification of the mobile terminal to the blacklist database when the cause of authentication failure belongs to the set blacklist database addition condition; , accepting the access request initiated by the mobile terminal; The MSC is configured to receive the notification of authenticating the mobile terminal sent by the base station, perform authentication on the mobile terminal, and send an authentication result to the base station.

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