CN100442912C - A method to ensure immediate network access for privileged wireless users - Google Patents

Abstract

The present invention relates to a method for ensuring that a privileged wireless user can access the network immediately, comprising: A. a base station controller receives a wireless user call origination message or a paging response message, and requests the mobile switching center to connect the user to the network; B. the mobile switching center According to the stored privileged user information, the center recognizes that the user is a privileged user, and when there are no available wireless channel resources, it selects a low-level online user to unlink, releases the wireless channel resources it occupies, and instructs the base station controller to The privileged user allocates the released wireless channel resources, and the privileged user accesses the network. The method of the invention can effectively ensure that privileged wireless users access the network immediately.

Description

A method to ensure immediate network access for privileged wireless users

technical field

The invention relates to the field of wireless communication, in particular to a method for ensuring instant network access of privileged wireless users in a CDMA digital cellular communication system.

Background technique

The resource allocation strategy of the CDMA system is as follows: the system always allocates resources to the users who access first. After the resources are allocated, the system will no longer allow users to access, and the system will not allow new users to access until the original call resources are released. When the system load is high, such a strategy will make it difficult for a single user to access for a period of time. For example, when a user accesses, the access fails due to insufficient system resources. During the user's next access attempt, other users may have occupied the resources just released, resulting in the user's second access failure. The same situation may lead to multiple access failures.

This strategy of simply judging the resource occupancy of users when they access is a "first come, first served" strategy. It does not consider user priorities, and only allocates resources based on the sequence of users' single access attempts, resulting in inconsistent resource allocation. fair. Especially for high-priority users, the access under high-load conditions depends entirely on the randomness of the access time, which cannot meet user needs.

The existing protocol specifies the PACA (Priority Access and Channel Assignment; priority access and channel assignment) function: when a PACA privileged user initiates a call, after sending the initial call message through the access channel, the BSC (Base Station Controller; base station controller ) finds that no service resource is available, then sends a PACA message (message) through the paging channel to notify the user that its access request has been put into the access queue, and notify the user of the position of its access request in the queue. Once other users release service resources, if there are other PACA users in the queue, the BSC sends a PACA message again to notify the user of the new position of their access request in the queue. If there are available service resources, the BSC sends a PACA message to notify the user to access again. At this time, the user sends an initial call through the access channel again and accesses the network normally.

The PACA function in the existing protocol has the following disadvantages:

1. Although it allows PACA users to access preferentially in the case of insufficient resources, it cannot guarantee immediate access of PACA users. The waiting time of users depends on the resource occupation status at that time, and the specific access time cannot be controlled.

2. The PACA function in the existing protocol does not involve the paging situation of the PACA user, and its function is not complete.

In practice, it should be considered that certain privileged users (such as important users such as military users and national defense users) should be allowed to access the network immediately when they initiate a call or page, instead of passively waiting for idle network resources before connecting to the network. However, although the PACA function is stipulated in the existing network access protocol, it still cannot meet the immediate network access requirements of privileged users.

Contents of the invention

The invention provides a method for ensuring immediate network access for privileged wireless users, which is used to solve the problem in the prior art that special users cannot be guaranteed immediate network access.

The inventive method comprises the following steps:

A. The base station controller receives the call-initiating message or the paging response message of the wireless user, and requests the mobile switching center to connect the user to the network;

B. The mobile switching center recognizes that the user is a privileged user according to the stored privileged user information, and when there is no wireless channel resource available, select a low-level online user to unlink, release the wireless channel resource occupied by it, and instruct the base station The controller allocates the released wireless channel resources for the privileged user, and accesses the privileged user to the network.

Said step A also includes: the base station controller checks whether there are currently available wireless channel resources after receiving the call origination message or the paging response message; and reports the check result to the mobile switching center;

The step B further includes: the mobile switching center learns whether there are currently available wireless channel resources according to the reported result information.

The method also includes:

When the mobile switching center recognizes that the user is a privileged user according to the stored privileged user information, and there are currently available wireless channel resources, it instructs the base station controller to directly connect the privileged user to the network.

The specific method of reporting the inspection result to the mobile switching center is as follows:

In the service connection request message or paging response message sent to the mobile switching center, the base station controller gives different signs to the bits indicating whether there are available service resources in the wireless environment and resource parameter fields according to the inspection results, and reports to the mobile switching center .

The specific method for instructing the base station controller to directly access the network for the privileged user is as follows:

The mobile switching center issues an assignment request message, and the assignment request message indicates that the user is a privileged user;

After receiving the assignment request message, the base station controller accesses the privileged user to the network if there are idle wireless channel resources; otherwise, relaxes the access threshold and accesses the privileged user to the network.

The specific method for indicating that the user is a privileged user is as follows: Include a call priority field in the assignment request message, and use reserved bits in this field for identification.

The low-level online user is a user belonging to the same cell as the user currently requesting access.

The base station controller is set to control the control switch of the privileged wireless user to connect to the network immediately, and the step B also includes the step of detecting whether the control switch is turned on. If the control switch is turned on, the mobile switching center instructs the base station to control If the device connects the privileged user to the network, otherwise, follow the normal network connection process.

When the control switch is in the on state, the hard assignment switch in the base station controller is turned on at the same time.

Adopting the method of the invention can ensure that the privileged user accesses the wireless network immediately without being limited by the current resource usage status of the network.

Description of drawings

Fig. 1 is a flow chart of the method of the present invention;

Fig. 2 is the signaling flowchart when the privileged user initiates a call;

Fig. 3 is the signaling flowchart when the privileged user paging;

Fig. 4 is a flow chart of link disconnection signaling initiated by the mobile switching center.

Detailed ways

For some special users, such as military users, in actual practice, they need to access the network immediately. For the convenience of description, such users are called privileged users; corresponding to the PACA users in the existing communication protocol, in this embodiment In EPACA (Extended Priority Access and Channel Assignment, Enhanced Priority Access and Channel Assignment) users.

The method of the present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to FIG. 1 , it is a flow of specific steps of the method embodiment of the present invention. First, a control switch is set in the BSC to control whether to allow EPACA users to access the network immediately. The inventive method comprises the steps:

Step S1, the BSC receives a call origination message or a paging response message from a wireless user;

Referring to Fig. 2, when the user initiates a call, the BSC receives the user's initial call message;

Referring to Figure 3, when the user pages, the MSC (Mobile Service Switch Center; Mobile Service Switching Center) sends a paging request to the BSC, and the BSC sends a paging message to the user after receiving it, and the user responds to the BSC with a paging response message .

Step S2, the BSC detects the current state of the control switch, if it is off, it means that the function of EPACA users to access the network immediately is not enabled, and step S3 is performed; otherwise, when the control switch is turned on, it means that the EPACA function is supported, that is, the privileged user is allowed to immediately access the network. Access to the network, go to step S4.

Step S3: The BSC executes a conventional network connection process.

Step S4, the BSC checks the usage status of the current wireless resources, and reports the check result to the MSC; the specific reporting method is as follows:

In the service connection request message or paging response message sent to the mobile switching center, the base station controller gives different bits to indicate whether there are available service resources in the field of its radio environment and resource parameters (Radio Environment and Resources) according to the check result. Identification, for example: correspondingly set to 1 or 0, and reported to the mobile switching center. See Table 1 below, which is the specific bit information in the wireless environment and resource field. The 0 bit (Avail) in this field indicates whether there are currently available service resources. If there are available resources, set it to 1, otherwise, Set to 0.

The wireless environment and resource parameter structure are shown in Table 1 below:

Table I:

Referring to Figure 2, in the initial call process, the BSC initiates a service connection request to the MSC. If there is no wireless channel resource currently, the Avail bit in the wireless environment and resource parameter field is set to "0" and reported to the MSC. Otherwise, the Avail is set to "1" and reported to MSC;

Referring to Figure 3, in the paging process, the BSC responds to the MSC with a paging response. If there is currently no wireless channel resource, set the Avail bit in the wireless environment and resource parameter field to "0" and report it to the MSC, otherwise, set the Avail Set to "1" to report to MSC.

After step S5, MSC receives above-mentioned message, judges whether current calling or paging user is a privileged user, concrete judging method is for example: all privileged users are pre-registered in MSC, such as its corresponding IMSI (International Mobile Subscriber Identity ; International Mobile Subscriber Identification Code) is stored in a privileged user list, when MSC receives the user's network connection request, it will search the privileged user list to determine whether the current user is a privileged user; if not, it will be processed according to the normal network connection process ; If a privileged user, continue with the following steps.

Step S6, MSC judges whether there are currently available wireless channel resources according to the identifier of the 0bit (Avail) in the wireless environment and resource parameter field in the received service connection request message or the paging response message; according to the above example, if the bit If the bit is 1, it means that there are currently available service resources, and step S7 is executed; if the bit is 0, it means that there are currently no available service resources, and step S8 is executed;

Step S7, MSC instructs BSC to directly access the network for the current user; the specific signaling process is shown in Figure 2 and Figure 3, including:

The MSC issues an assignment request to the BSC;

The BSC judges whether there are currently idle wireless channel resources, and if so, uses the idle resources to send a channel assignment message to the user terminal; otherwise, uses a more relaxed access threshold than the conventional access threshold to send channel assignment message;

After the user terminal completes the service connection, it responds to the BSC with a service connection completion message;

The BSC responds to the MSC with an assignment complete message, and successfully implements the user's access to the network.

Step S8, the MSC initiates a link disconnection process, releases the wireless channel resources occupied by low-level online users, and sends an assignment request to the BSC;

The specific unlinking process is shown in Figure 4, including the following steps:

The MSC sends a disconnection command to the BSC;

After receiving the link disconnection command, the BSC issues a resource release command to the user terminal;

The user terminal responds to the resource release message;

The BSC releases the call channel resource occupied by the user, marks it as a "privileged user-only resource", and reports a link disconnection completion message to the MSC.

The low-level online users who are disconnected generally select the users belonging to the same cell as the current user, regardless of other cells reported in the wireless environment field in the origination message or paging response message, mainly for the following reasons:

1. The access of mobile users (MS) mainly depends on the access cell, and some mobile users do not report the wireless environment field;

2. The wireless environment field may contain the carrier frequency of the foreign BSC, which cannot be judged; therefore, the MSC only performs the forced release of the call for the access cell.

In addition, the assignment request sent to the BSC includes a call priority field, and uses reserved bits in this field to identify the current user as a privileged user. For example: two bits (bits) 6 and 7 in this field are assigned values, such as setting to "01", which indicates that the current user is a privileged user.

The bit structure in the priority field (Priproty) is shown in Table 2 below:

Table II:

Step S9: After BSC receives the assignment request from MSC, if the current user is a privileged user, it checks whether there is a released "privileged user dedicated resource", if so, allocates it to the current privileged user, otherwise, uses Relatively loose entry threshold, the user is connected to the network.

For MSC, since the frequency points of each carrier frequency in the cell are not known, the frequency points of ordinary users removed by MSC may be different from the access frequency points of current EPACA users. To ensure effective access of EPACA users, BSC should While supporting the EPACA function (that is, turn on the control switch), turn on its hard assignment switch, assign the currently removed frequency point to the EPACA user requesting access, so that the EPACA user can use the removed frequency point as the access frequency point to successfully connect into the network.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1, a kind of method that guarantees privileged wireless user to connect network instantly, it is characterized in that, comprises the following steps: A. The base station controller receives the call-initiating message or the paging response message of the wireless user, and requests the mobile switching center to connect the user to the network; B. The mobile switching center recognizes that the user is a privileged user according to the stored privileged user information, and when there is no wireless channel resource available, select a low-level online user to unlink, release the wireless channel resource occupied by it, and instruct the base station The controller allocates the released wireless channel resources for the privileged user, and accesses the privileged user to the network. 2. The method according to claim 1, wherein said step A further comprises: after the base station controller receives the call origination message or the paging response message, checks whether there are currently available wireless channel resources; and checks the result Report to the mobile switching center; The step B further includes: the mobile switching center learns whether there are currently available wireless channel resources according to the reported result information. 3. The method according to claim 1 or 2, further comprising: When the mobile switching center recognizes that the user is a privileged user according to the stored privileged user information, and there are currently available wireless channel resources, it instructs the base station controller to directly connect the privileged user to the network. 4. The method according to claim 2, wherein the specific method for reporting the inspection result to the mobile switching center is: In the service connection request message or paging response message sent to the mobile switching center, the base station controller gives different signs to the bits indicating whether there are available service resources in the wireless environment and resource parameter fields according to the inspection results, and reports to the mobile switching center . 5. The method according to claim 3, wherein the specific method for instructing the base station controller to directly access the network for the privileged user is as follows: The mobile switching center issues an assignment request message, and the assignment request message indicates that the user is a privileged user; After receiving the assignment request message, the base station controller accesses the privileged user to the network if there are idle wireless channel resources; otherwise, relaxes the access threshold and accesses the privileged user to the network. 6. The method according to claim 5, wherein the specific method for indicating that the user is a privileged user is: including a call priority field in the assignment request message, and using reserved bits in this field to logo. 7. The method according to claim 1, wherein the low-level online user is a user belonging to the same cell as the user currently requesting access. 8. The method according to claim 1, wherein the base station controller is set to control a control switch for immediate network access of privileged wireless users, and said step B also includes the step of detecting whether the control switch is turned on , if the control switch is turned on, the mobile switching center instructs the base station controller to connect the privileged user to the network; otherwise, follow the normal network access process. 9. The method according to claim 8, characterized in that, when the control switch is turned on, the hard assignment switch in the base station controller is turned on at the same time.

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