WO2012103842A2

WO2012103842A2 - Method and base station controller thereof for sending channel assignment message

Info

Publication number: WO2012103842A2
Application number: PCT/CN2012/073247
Authority: WO
Inventors: 林常志; 邱建军
Original assignee: 华为技术有限公司
Priority date: 2012-03-29
Filing date: 2012-03-29
Publication date: 2012-08-09
Also published as: WO2012103842A3; CN102742324A; CN102742324B

Abstract

A method and a base station controller (BSC) thereof for sending a channel assignment message are provided in the embodiments of the present invention, which relate to the field of mobile communication. The method includes the following steps: when a Mobile Station (MS) is switching from a source BSC to a target BSC, the source BSC acquires the access frequency of the MS and assigns a service channel for the MS; the source BSC sends the channel assignment message to the MS at the access frequency, the information of the service channel assigned for the MS by the source BSC being included in the channel assignment message. The present invention enables the MS to receive the channel assignment message exactly and increases the success efficiency of an MS accessing and sending uplink data to a BSC.

Description

Method for transmitting channel assignment information and base station controller

The present invention relates to the field of mobile communications technologies, and in particular, to a method for transmitting channel assignment information and a base station controller. Background technique

In mobile communication systems, such as the Global System of Mobi le communicat ion (GSM) or Code Division Multiple Access (CDMA) systems, mobile stations ( English: Mobi le Stat, MS for short) There is no signaling connection between the mobile station and the Base Station Controller (BSC). Mobile station in idle state

If the uplink data is to be sent to the accessing base station controller, the base station controller needs to be called, and after receiving the initial call message sent by the mobile station, the base station controller assigns a service channel to the mobile station, and The mobile station sends the channel assignment information, and the mobile station can access and send the uplink data to the base station controller in the traffic channel indicated in the received channel assignment information.

If the mobile station switches during the initial call, that is, the mobile station is switched by the accessed base station controller (herein referred to as the source base station controller) to the detected base station controller (herein referred to as the target base station controller). The source base station controller and the mobile station interrupt the information exchange, and they do not know the access frequency of the mobile station, thereby causing the source base station controller to fail to accurately transmit the channel assignment information to the mobile station. Further, because the mobile station cannot accurately receive the channel assignment information, it cannot know the service channel assigned by the source base station controller, and finally the mobile station cannot send the uplink data, causing the service to fail. Summary of the invention

In order to solve the problem that the base station controller cannot accurately transmit the channel assignment information to the mobile station, the embodiment of the present invention provides a method for transmitting channel assignment information and a base station controller. The technical solution is as follows:

A method of transmitting channel assignment information, the method comprising:

When the mobile station is handed over by the source base station controller to the target base station controller, the source base station controller acquires an access frequency point of the mobile station and assigns a service channel to the mobile station;

Transmitting, by the source base station controller, channel assignment information to the mobile station at the access frequency point, where the channel assignment information includes a service channel allocated by the source base station controller to the mobile station information. A base station controller, where the base station controller is a source base station controller when the mobile station performs handover, and includes: a processor and a first transmitter;

The processor is configured to: when the mobile station is handed over by the source base station controller to the target base station controller, acquire an access frequency point of the mobile station, and assign a service channel to the mobile station;

The first sending module is configured to send channel assignment information to the mobile station at the access frequency point, where the channel assignment information includes the source base station controller that is allocated by the mobile station Information on the traffic channel.

The technical solution provided by the embodiment of the present invention has the beneficial effects that: by acquiring the access frequency of the mobile station and transmitting the channel assignment information to the mobile station at the acquired access frequency, the source can be made The base station controller accurately transmits the channel assignment information to the mobile station. Further, the mobile station can access and send uplink data to the base station controller according to the received channel assignment information, thereby improving communication efficiency.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

1 is a flowchart of a method for transmitting channel assignment information according to an embodiment of the present invention;

2 is a flowchart of a method for transmitting channel assignment information according to an embodiment of the present invention;

3 is a flowchart of a method for transmitting channel assignment information according to an embodiment of the present invention;

4 is a base station controller according to an embodiment of the present invention;

FIG. 5 is a base station controller according to an embodiment of the present invention;

FIG. 6 is a base station controller according to an embodiment of the present invention. detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

See Figure 1.

Referring to FIG. 1, a method for transmitting channel assignment information, the method includes the following steps:

Step 101: When the mobile station is handed over by the source base station controller to the target base station controller, the source base station controller acquires an access frequency point of the mobile station and assigns a service channel to the mobile station; Step 102: The source base station controller sends channel assignment information on the access frequency point of the mobile station, where the channel assignment information includes information about a service channel that the source base station controller assigns to the mobile station. .

Realizing the technical solution of transmitting the channel assignment information to the mobile station by acquiring the access frequency of the mobile station and transmitting the channel assignment information to the mobile station, so that the source base station controller can accurately determine the channel assignment information Send it to the mobile station. Further, the mobile station can access and send uplink data to the base station controller according to the received channel assignment information, thereby improving communication efficiency.

Before describing in detail the technical solution shown in Figure 1, a brief introduction to the process of switching a mobile station from a source base station controller to a target base station controller is as follows:

The mobile station sends an initial call message to the source base station controller through an access channel with the source base station controller. If the channel quality of the access channel is poor or the channel load is too heavy, the source base station controller may not receive the mobile station. The originating call message is sent, and the source base station controller does not return the originating call response message to the mobile station. Then, after the mobile station does not receive the initial call response message returned by the source base station controller for a period of time, it starts to detect other The base station controller, trying to switch.

If the mobile station detects the target base station controller adjacent to the source base station controller, the mobile station transmits an initial call message to the target base station controller through the access channel between the mobile station and the target base station controller, if the target base station controls Upon receiving the initial call message sent by the mobile station, the device returns an originating call response message to the mobile station.

If the mobile station receives the originating call response message sent by the target base station controller, stopping detecting other target base station controllers, and switching to the target base station controller that sends the initial call response message, waiting to receive channel assignment information; If the mobile station does not receive the initial call message sent by the target base station controller for a period of time, continue to detect other target base station controllers, and send an initial call message to the other target base station controllers until one of the targets is received. When the base station controller sends an initial call response message, it stops detecting other target base station controllers, and switches to the target base station controller that sends the initial call response message, waiting to receive channel assignment information.

Based on the handover procedure of the mobile station, the method for transmitting the channel assignment information is described in detail below with reference to the specific embodiment. Referring to FIG. 2, the method includes the following steps:

Step 201: When the mobile station is handed over to the target base station controller by the source base station, the mobile station sends an initial call message to the target base station controller, and after receiving the initial call message sent by the mobile station, the target base station controller The source base station controller sends a first access channel information transfer (English: Access Channel Message Transfer) message.

As an optional embodiment, the first access channel information transfer message may carry the access frequency information of the mobile station.

In an embodiment of the present invention, when the target base station controller and the mobile station use the same access frequency point for information interaction, when the mobile station is switched from the source base station to the target base station controller, the mobile station is at the target base station. Determine An access frequency point, and sending an initial call message to the target base station controller on the access channel between the target base station controller and the mobile station by using the determined access frequency point, where the target base station controller needs to adopt the mobile station The access frequency point with the same access frequency point receives the initial call message, so that the target base station controller can learn the mobile station's access frequency point information according to the access frequency point information of the initial call message received by the target base station controller. Access frequency information;

The target base station controller writes the learned access point information of the mobile station to the first access channel information transfer message, and sends the first access channel information transfer message carrying the access point information of the mobile station to the source. The base station controller, here "first" is only used to distinguish the access channel transfer message from other access channel transfer messages, and does not constitute a restriction on the access channel transfer message name.

For example, the access frequency information of the mobile station carried by the first access channel information transfer message may include the content as shown in Table 1.

Table 1: Mobile station access frequency information

The specific structure of Channel Identity can be as shown in Table 2:

Table 2 Channel Identity Structure

Among them, ARFCN (English full name: Absolute Radio Frequency Channel Number) is used to identify the frequency of the frequency, ARFCN can be the broadcast control channel (English: Broadcast Control Channel, BCCH) frequency, or can be a traffic channel (English: Traffic Channel , TCH) frequency, or access channel (English: Access channel, ACH) Frequency point, etc.

The Band Class is used to identify the frequency band occupied by the operator in the mobile communication system. For example, 0 means that China Unicom uses a 850MHz divided network.

Step 202: After receiving the first access channel information transfer message carrying the access point information of the mobile station, the source base station controller returns a first access channel information transfer response to the target base station (for example, Access Channel Message Transfer). ACK) message, and assigning a service channel to the mobile station; in this step, the source base station controller may assign a service channel to the mobile station according to the current load condition and channel quality of each service channel.

As an optional embodiment, the source base station controller sends the information of the traffic channel assigned by the mobile station to the mobile station by the source base station controller, as described in steps 203 and 204;

As another optional embodiment, the information of the traffic channel assigned by the source base station controller to the mobile station is sent by the source base station controller to the mobile station, and may also be sent to the mobile station by the target base station controller to increase the mobility. The possibility of the station receiving the information of the traffic channel assigned by the source base station controller to the mobile station is described in detail in steps 203 to 206.

Step 203: The source base station controller parses the received first access channel information transfer message to obtain an access frequency of the mobile station.

In the embodiment of the present invention, steps 202 and 203 are not limited in the execution order.

Step 204: The source base station controller sends channel assignment information to the mobile station at the access frequency of the resolved mobile station, where the channel assignment information carries information of the service channel allocated by the active base station controller for the mobile station. ;

Step 205: The source base station controller sends a second access channel information transfer message carrying channel assignment information to the target base station controller; where the "second" is used only for the access channel transfer message and other access channels. The transfer message is different and does not limit the access channel transfer message name.

Step 206: After receiving the second access channel information transfer message carrying the channel assignment information, the target base station controller sends the channel assignment information to the mobile station at the access frequency point of the mobile station that is known in advance, and sends the channel assignment information to the mobile station. The source base station controller sends a second access channel information transfer response (eg, Access Channel Message Transfer ACK) message.

In the embodiment of the present invention, the channel assignment information may be extended channel assignment information (English: Extended Channel Assignment Message, ECAM for short).

Through the above steps, the mobile station can receive the channel assignment information sent by the source base station controller, or the source base station controller and the target base station controller, and then the mobile station side can be indicated by the received channel assignment information. The traffic channel accesses the network and starts the service. When the mobile station receives the channel assignment information sent by the source base station control and the target base station controller, the mobile station can access the network according to the traffic channel indicated by the previously received channel assignment information.

Based on the handover process of the mobile station, the embodiment of the present invention further provides another method for transmitting channel assignment information. Referring to FIG. 3, the following operations are specifically included: Step 301: When the mobile station is handed over by the source base station controller to the target base station controller, the mobile station sends an initial call message to the target base station controller, and the target base station controller receives the initial call message sent by the mobile station. Transmitting, by the source base station controller, a first access channel information transfer (eg, an Access Channel Message Transfer) message, notifying the source base station controller that the mobile station has performed the handover;

Step 302: After receiving the first access channel information transfer message, the source base station controller calculates the access frequency of the mobile station according to a preset hash algorithm.

Specifically, calculating, by using a preset hash algorithm, the access frequency of the mobile station includes: acquiring, by the source base station controller, a carrier frequency when the mobile station accesses the source base station controller for the first time;

When the mobile station is handed over to the target base station controller by the first access source base station controller, the source base station controller may perform signaling interaction with the mobile station according to the mobile station when accessing the source base station controller for the first time. Obtaining the carrier frequency of the bearer signalling during the first access of the mobile station to the source base station controller.

The source base station controller obtains the number of access frequency points supported by the source base station controller from the channel list corresponding to the acquired carrier frequency;

In the embodiment of the present invention, the channel list corresponding to each carrier frequency of the source base station controller may be pre-configured, and the channel list includes the number of access frequency points supported by the source base station controller, and each supported The number corresponding to the frequency point is accessed, so that the source base station controller can learn the number of access frequency points supported by the source base station controller through the channel list.

The source base station controller calculates the access frequency of the mobile station by using a preset hash algorithm according to the obtained number of access frequency points and the identification information of the mobile station saved by the source base station controller;

In the embodiment of the present invention, when the mobile station accesses the source base station controller for the first time, it registers with the source base station controller, and informs the source base station controller of its own identification information, and the source base station controller saves the identifier of the mobile station. Specifically, the identification information of the mobile station may be an International Mobile Equipment Identification Number (IMEI) or an International Mobile Subscriber Identity (English: International Mobi le Subscriber Ident) Ificat ion Number, Janeer IMSI).

The access frequency of the mobile station is calculated according to the number of access frequency points and the identification information of the mobile station by using a preset hash algorithm, including:

The source base station controller calculates the hash value by using a preset hash algorithm by using the number of access frequency points and the identification information of the mobile station;

The source base station controller searches the channel list according to the hash value, and uses the access frequency point whose number is the same as the hash value in the channel list as the access frequency point of the mobile station.

In the embodiment of the present invention, the preset hash algorithm may specifically be a SHA1 (Secure Hash Algorithm). Full hash algorithm) or MD5 (Message Digest algorithm 5, message digest algorithm fifth edition) and other algorithms, can also be a custom extended hash algorithm;

In the embodiment of the present invention, the process in which the source base station controller calculates the hash value by using the number of access frequency points and the identification information of the mobile station by using SHA1 or MD5 can be seen in the prior art process for calculating the hash value of SHA1 or MD5. , will not repeat them here.

In the embodiment of the present invention, the source base station controller calculates the hash value by using a custom extended hash algorithm to calculate the number of access frequency points and the identification information of the mobile station as follows:

1. The source base station controller pre-processes the identification information of the mobile station, that is, divides the identification information of the mobile station into high, middle, and low bits; wherein, the low bit is represented by L, the median is represented by M, and the high bit is represented by H;

For example, if the identification information of the mobile station is 48 bits, the source base station controller divides the identification information of the mobile station, including:

(1), taking the 0th to 15th bits of the identification information of the mobile station as the lower bit, denoted by L;

(2), taking the 16th to 31st bits of the identification information of the mobile station as the median, denoted by M;

(3), taking the 32th to 47th special points of the identification information of the mobile station as the high position, denoted by H;

Of course, the above is only an example. In practical applications, the identification information of the mobile station may also be greater than 48 bits or less than 48 bits. For example, when the mobile station's identification bit is less than 48 bits, the mobile station's identification information can be complemented by 48 bits using the high-order zero padding. When the identity of the mobile station is greater than 48 bits, the identification information of the mobile station can be divided by a method similar to that described above.

2. The source base station controller performs an exclusive-OR operation on the same preset parameter, and the preset parameter can be set by the artificial setting or by the software. In this embodiment, the preset parameter takes a value of 0;

3, the source base station controller results ^ M, H at the same time and the same parameters preset exclusive OR operation by a constant, for example, by (a golden point ²¹⁶⁾ after 40503 modulo 2 ^16, the result range 0 to 2 ¹⁶ -1;

4. The source base station controller divides the calculated result of 3 by 2 ¹⁶ and multiplies the number of access frequency points, and rounds up the calculation result to obtain a 0 to the number of access frequency points minus one. Hash value.

Step 303: The source base station controller assigns a service channel to the mobile station.

In this step, the source base station controller may allocate a traffic channel to the mobile station according to the current load condition and channel quality of each traffic channel.

In the embodiment of the present invention, steps 302 and 303 are not limited in the execution order.

As an optional embodiment, the source base station controller sends the information of the traffic channel assigned by the mobile station to the mobile station by the source base station controller, as described in step 304.

As another optional embodiment, the information of the traffic channel assigned by the source base station controller to the mobile station is controlled by the source base station. While being sent to the mobile station, the controller may also send to the mobile station through the target base station controller to increase the possibility that the mobile station receives the information of the traffic channel assigned by the source base station controller to the mobile station. For details, see step 304. Description of 306. Step 304: The source base station controller sends channel assignment information to the mobile station at the access frequency point of the calculated mobile station, where the channel assignment information carries the service channel information that the active base station controller assigns to the mobile station.

Step 305: The source base station controller sends a second access channel information transfer message carrying channel assignment information to the target base station controller.

Step 306: After receiving the second access channel information transfer message carrying the channel assignment information, the target base station controller sends the channel assignment information to the mobile station at the access frequency point of the mobile station that is known in advance, and sends the channel assignment information to the mobile station. The source base station controller sends a second access channel information transfer response (for example, an Access Channel Message Transfer ACK) message. For the description of how the target base station learns the access frequency of the mobile station in this step, refer to step 201. Let me repeat.

Through the above steps, the mobile station can receive the channel assignment information sent by the source base station controller or the target base station controller, and then the mobile station side can access the network by the service channel indicated by the received channel assignment information. And start the business. Wherein, when the mobile station receives the channel assignment information sent by the source base station control and the target base station controller, the mobile station can access the network according to the traffic channel indicated by the channel assignment information received first.

By obtaining the access frequency of the mobile station and transmitting the channel assignment information to the mobile station at the acquired access frequency point, the mobile station can accurately receive the channel assignment information, thereby improving the channel allocation information. The success rate of the mobile station accessing and transmitting the uplink data to the base station controller.

Referring to FIG. 4, an embodiment of the present invention provides a base station controller, where the base station controller is a source base station controller when the mobile station performs handover, and specifically includes: a processor 401 and a first transmitter 402;

The processor 401 is configured to: when the mobile station is handed over by the source base station controller to the target base station controller, acquire an access frequency point of the mobile station and assign a service channel to the mobile station;

a first transmitter 402, configured to send channel assignment information to the mobile station at an access frequency point acquired by the processor 401, where the channel assignment information includes the source base station controller as the mobile station Information about the assigned traffic channel.

In the embodiment of the present invention, referring to FIG. 5, the processor 401 shown in FIG. 4 includes:

The first processing unit 4011 is configured to receive, by the target base station controller, a first access channel information transfer message that carries the access point information of the mobile station, and obtain an access frequency point by parsing the channel information transfer message; or

The second processing unit 4012 is configured to calculate an access frequency point of the mobile station according to a preset hash algorithm. The processor 401 further includes: The third processing unit 4013 is configured to allocate a traffic channel to the mobile station.

The second processing unit 4012 includes:

a first processing subunit, configured to acquire a carrier frequency when the mobile station accesses the source base station controller for the first time;

a second acquiring subunit, configured to acquire, according to the carrier frequency, a channel list corresponding to the carrier frequency, and obtain, from a channel list corresponding to the carrier frequency, a number of access frequency points supported by the source base station controller;

And a calculating sub-unit, configured to calculate, according to the number of access frequency points and the identification information of the mobile station saved by the source base station controller, a preset hash algorithm to calculate an access frequency point of the mobile station.

Specifically, the calculating subunit is configured to calculate a hash value by using a preset hash algorithm by using the number of access frequency points and the identification information of the mobile station, and searching for the channel list according to the hash value, and numbering and hashing the channel list. The access frequency points with the same value are used as the access frequency points of the mobile station.

Referring to FIG. 6, the base station controller of FIG. 4 further includes: a second transmitter 403, configured to send a second access channel information transfer message carrying channel assignment information to the target base station controller, so that the target base station controller is moving The access frequency of the station sends and receives channel assignment information to the mobile station.

Optionally, in the embodiment of the invention, the first transmitter 402 and the second transmitter 403 may be integrated into one entity.

By obtaining the access frequency of the mobile station and transmitting the channel assignment information to the mobile station at the acquired access frequency point, the mobile station can accurately receive the channel assignment information, thereby improving the channel allocation information. The efficiency with which the mobile station accesses and transmits uplink data to the base station controller.

The base station controller in the embodiment of the present invention may include all hardware entities that perform the foregoing method embodiments. For the interaction between the modules of the base station controller, refer to the description of the method embodiment section, and details are not described here.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Claim

A method for transmitting channel assignment information, the method comprising:

Transmitting, by the source base station controller, channel assignment information to the mobile station at the access frequency point, where the channel assignment information includes a service channel allocated by the source base station controller to the mobile station information.

The method according to claim 1, wherein the obtaining, by the source base station controller, the access frequency of the mobile station comprises:

The source base station controller receives a first access channel information transfer message that is sent by the target base station controller and carries the access frequency point information of the mobile station, and obtains the mobile station by parsing the channel information transfer message. Access frequency point; or

The source base station controller calculates the access frequency point of the mobile station according to a preset hash algorithm.

The method according to claim 2, wherein the source base station controller calculates the access frequency of the mobile station according to a preset hash algorithm, including:

The source base station controller acquires a carrier frequency when the mobile station accesses the source base station controller for the first time;

And obtaining, by the source base station controller, a channel list corresponding to the carrier frequency according to the carrier frequency, and acquiring, by using a channel list corresponding to the carrier frequency, a number of access frequency points supported by the source base station controller;

And the source base station controller calculates the access frequency of the mobile station by using a preset hash algorithm according to the number of the access frequency points and the identifier information of the mobile station saved by the source base station controller.

The method according to claim 3, wherein the source base station controller calculates the mobile station by using a preset hash algorithm according to the number of access frequency points and the identification information of the mobile station. Access frequency points include:

The source base station controller calculates the number of the access frequency points and the identification information of the mobile station by using a preset hash algorithm to obtain a hash value;

And the source base station controller searches the channel list according to the hash value, and uses an access frequency point in the channel list that is the same as the hash value as an access frequency point of the mobile station.

The method according to claim 3 or 4, wherein the preset hash algorithm comprises: SHAK Secure Hash Algorithm, or MD5 (Message Digest algorithm 5, message digest algorithm fifth) Version).

The method according to any one of claims 1 to 5, wherein the method further comprises: the source base station controller transmitting a second access channel information transfer message carrying the channel assignment information to And a target base station controller, so that the target base station controller sends the channel assignment information to the mobile station at an access frequency point of the mobile station.

A base station controller, wherein the base station controller is a source base station controller when the mobile station performs handover, and includes: a processor and a transmitter;

a processor, configured to: when the mobile station is handed over by the source base station controller to the target base station controller, acquire an access frequency point of the mobile station and assign a service channel to the mobile station;

a first transmitter, configured to send channel assignment information to the mobile station on the access frequency point, where the channel assignment information includes a service channel allocated by the source base station controller to the mobile station Information.

The base station controller according to claim 7, wherein the processor comprises:

a first processing unit, configured to receive an access channel information transfer message that is sent by the target base station controller and that carries the first access frequency point information of the mobile station, and obtain the access by parsing the channel information transfer message a frequency processing point; or a second processing unit, configured to calculate, according to a preset hash algorithm, an access frequency point of the mobile station;

as well as

And a third processing unit, configured to allocate a traffic channel to the mobile station.

The base station controller according to claim 8, wherein the second processing unit comprises: a first acquiring subunit, configured to acquire, when the mobile station accesses the source base station controller for the first time Frequency

And a second obtaining sub-unit, configured to acquire, according to the carrier frequency, a channel list corresponding to the carrier frequency, and obtain, from a channel list corresponding to the carrier frequency, a number of access frequency points supported by the source base station controller;

And a calculating sub-unit, configured to calculate, by using a preset hash algorithm, the access frequency point of the mobile station according to the number of the access frequency points and the identifier information of the mobile station saved by the source base station controller.

The base station controller according to claim 9, wherein the calculating subunit is specifically used for The number of access frequency points and the identification information of the mobile station are calculated by using a preset hash algorithm, and the hash value is searched according to the hash value, and the channel list is numbered and the hash number is The access frequency point with the same hash value is used as the access frequency point of the mobile station.

The base station controller according to any one of claims 7 to 10, wherein the base station controller further comprises: a second transmitter, configured to send a second access carrying the channel assignment information The channel information transfer message is sent to the target base station controller, so that the target base station controller sends the channel assignment information to the mobile station at the access frequency point of the mobile station.