CN107371197B - A handover method and base station - Google Patents

Abstract

The embodiments of the present invention disclose a handover method and a base station. The method includes: a source base station sending a handover request message carrying specific information to a target base station; the specific information is used by the target base station to select a frequency point for terminal access; receiving a handover request response message of the target base station; the handover The request response message includes handover frequency information; a handover command is sent to the terminal; the handover command includes handover frequency information.

Description

A handover method and base station

technical field

The present invention relates to wireless communication technology, in particular to a handover method and a base station.

Background technique

Different frequency band categories defined by the current 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) standards overlap each other, such as BAND38 (TD-LTE, 2570-2620MHz), BAND41 (TD-LTE, 2496-2690MHz) and BAND7 (LTE-FDD uplink: 2500-2570MHz, downlink: 2620-2690MHz), it can be seen that BAND41 includes BAND38 and BAND7. If the operator has obtained both BAND38 and BAND41 frequency bands, and the network equipment uses BAND38 as the main frequency band and BAND41 as the auxiliary frequency band. In this case, a terminal with overlapping frequency band capability (such as B38/B41) and support for multi-band indication enhancement switches over the X2 interface between different types of base stations, for example, from supporting overlapping frequency band capability (such as B38/B41) and supporting multi-band indication There is a problem in the handover between the enhanced base station to the base station that supports overlapping frequency band capability (such as B38/B41) but does not support multi-band indication enhancement, resulting in handover failure.

SUMMARY OF THE INVENTION

In order to solve the existing technical problems, the embodiments of the present invention provide a handover method and a base station, which can solve the problem of handover failure of overlapping frequency bands.

In order to achieve the above-mentioned purpose, the technical scheme of the embodiment of the present invention is realized as follows:

An embodiment of the present invention provides a handover method, and the method includes:

The source base station sends a handover request message carrying specific information to the target base station; the specific information is used by the target base station to select a frequency point for the terminal to access;

receiving a handover request response message from the target base station; the handover request response message includes handover frequency point information;

Send a handover command to the terminal; the handover command includes handover frequency information.

In the above solution, before the source base station sends a handover request message carrying specific information to the target base station, the method further includes: the source base station analyzes the capability of the target base station, the terminal capability and the target handover frequency, and based on the analysis As a result, it is determined whether or not specific information is added to the handover request message.

In the above solution, the capability of the target base station, the capability of the terminal, and the target handover frequency are analyzed, and based on the analysis result, it is determined whether to add specific information to the handover request message, including:

When the target base station supports overlapping frequency bands, the terminal supports overlapping frequency bands, and the target handover frequency is an overlapping frequency band, it is determined to add specific information to the handover request message.

In the above solution, the capability of the target base station, the capability of the terminal, and the target handover frequency are analyzed, and based on the analysis result, it is determined whether to add specific information to the handover request message, including:

When the target base station does not support overlapping frequency bands, or the terminal does not support overlapping frequency bands, or the target handover frequency is not an overlapping frequency band, it is determined that the specific information is not added to the handover request message.

In the above solution, the specific information includes: source base station encryption key, terminal resident frequency and network color code (NCC).

The embodiment of the present invention also provides a handover method, the method includes:

The target base station receives the handover request message from the source base station;

When the handover request message includes specific information and the target base station supports overlapping frequency bands, obtain the handover frequency information according to the terminal capability, the terminal resident frequency carried in the specific message, and the preset handover rule;

The target base station sends a handover request response message carrying the handover frequency point information to the source base station.

In the above solution, the handover frequency information obtained according to the terminal capability, the terminal resident frequency carried in the specific message, and the preset handover rule includes:

When the preset handover rule indicates that the terminal camping frequency point is the first priority, the target base station selects the terminal camping frequency point as the handover frequency point;

When the preset handover rule indicates that the largest frequency band in the overlapping frequency bands is the first priority, the target base station selects the largest frequency band as the handover frequency point;

When the preset handover rule indicates that the frequency selected by the terminal initially accesses the target base station as the handover frequency, the target base station selects the frequency initially accessed by the terminal as the handover frequency according to the terminal capability.

In the above solution, the specific information further includes: the source base station encryption key and NCC; the method further includes:

The encryption key is calculated based on the source base station encryption key, the NCC and the handover frequency.

An embodiment of the present invention further provides a base station, where the base station is a source base station; the base station includes: a first sending unit and a first receiving unit; wherein,

The first sending unit is configured to send a handover request message carrying specific information to the target base station; the specific information is used by the target base station to select a frequency point for the terminal to access;

The first receiving unit is configured to receive a handover request response message of the target base station; the handover request response message includes handover frequency point information;

The first sending unit is further configured to send a handover command to the terminal; the handover command includes handover frequency point information.

In the above solution, the base station further includes a first processing unit, which is used for performing the processing on the capability of the target base station, the terminal capability and the target switching frequency before the first sending unit sends the handover request message carrying the specific information to the target base station. Analyze, and determine whether to add specific information to the handover request message based on the analysis result.

In the above solution, the first processing unit is configured to, when the target base station supports overlapping frequency bands, the terminal supports overlapping frequency bands, and the target handover frequency point is an overlapping frequency band, determine to add a specific frequency band in the handover request message. information.

In the above solution, the first processing unit is configured to determine that in the handover request message when the target base station does not support overlapping frequency bands, or the terminal does not support overlapping frequency bands, or the target switching frequency point is not an overlapping frequency band The specific information is not added.

An embodiment of the present invention further provides a base station, where the base station is a target base station; the base station includes: a second receiving unit, a second processing unit, and a second sending unit; wherein,

the second receiving unit, configured to receive the handover request message of the source base station;

The second processing unit is configured to, when the handover request message received by the second receiving unit includes specific information and the target base station supports overlapping frequency bands, according to the terminal capability, the terminal carried in the specific message Dwell frequency and preset switching rule to obtain switching frequency;

The second sending unit is configured to send a handover request response message carrying the handover frequency point information to the source base station.

In the above solution, the second processing unit is configured to select the terminal resident frequency as the switching frequency when the preset switching rule indicates that the terminal resident frequency is the first priority; when the preset switching rule When it is indicated that the largest frequency band in the overlapping frequency bands is the first priority, the largest frequency band is selected as the handover frequency; when the preset handover rule indicates that the frequency selected according to the initial access target base station of the terminal is used as the handover frequency, then According to the terminal capability, the frequency point initially accessed by the terminal is selected as the handover frequency point.

In the above solution, the specific information further includes: source base station encryption key and NCC;

The second processing unit is further configured to calculate the encryption key based on the source base station encryption key, the NCC and the handover frequency point.

In the handover method and base station provided by the embodiments of the present invention, on the one hand, the source base station sends a handover request message carrying specific information to the target base station; the specific information is used by the target base station to select a frequency point for the terminal to access; The handover request response message includes the handover frequency information; a handover command is sent to the terminal; the handover command includes the handover frequency information. On the other hand, the target base station receives the handover request message from the source base station; when the handover request message includes specific information, and the target base station supports overlapping frequency bands, according to the terminal capability, the terminal resident frequency carried in the specific message A handover frequency point is obtained by using a preset handover rule and a handover frequency point; the target base station sends a handover request response message carrying the handover frequency point information to the source base station. In this way, using the technical solutions of the embodiments of the present invention, the source base station analyzes and determines according to the terminal capability, the target base station capability, and the target handover frequency, and adds a piece of information to the handover request message. In this way, the target base station can select a suitable handover frequency point for the terminal to access according to the terminal capability, thereby solving the problem of handover failure in overlapping frequency bands and ensuring the success of the terminal handover.

Description of drawings

FIG. 1 is a schematic flowchart of a handover method according to Embodiment 1 of the present invention;

2 is a schematic flowchart of a source base station judging whether to add specific information in a handover request in Embodiment 1 of the present invention;

3 is a schematic flowchart of a handover method according to Embodiment 2 of the present invention;

4 is a schematic flowchart of a target base station selecting a handover frequency point in Embodiment 2 of the present invention;

5 is a schematic flowchart of a handover method according to Embodiment 3 of the present invention;

6 is a schematic diagram of a first composition structure of a base station according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a second composition structure of a base station according to an embodiment of the present invention.

Detailed ways

The inventor of the present application found that in the handover process based on the X2 interface, according to the 3GPP 36.423 protocol, the source cell needs to carry the AS security information (AS SecurityInformation) in the handover request (HANDOVER REQUEST) message; the AS Security Information carries the Key eNodeB Star cell (hereinafter referred to as KeNB*). According to the description in 3GPP 33.401: the source cell uses the physical cell identifier (PCI, Physical CellIdentifier) of the target cell, the downlink carrier frequency point (DL-EARFCN) and the source cell (KeNB) to calculate the KeNB* used by the target cell, and send For the target cell, the target cell will use it directly after receiving the KeNB*. After the UE side obtains the handover command (including the EARFCN transmitted by the target base station to the UE), KeNB* is calculated by the same method.

According to the 3GPP 36.331 protocol, the description for the Key eNodeB Star is as follows: If the target cell is an overlapping frequency band cell, the source cell selects the same logical method as the UE's initial access target cell selection bandwidth (band) to calculate the target side frequency point (ARFCN), thus Calculate KeNB*.

For cells with overlapping frequency bands, the terminal with overlapping frequency band capability (such as B38/B41) and supporting multi-band indication enhancement can switch the X2 interface between different types of base stations (for example, from supporting overlapping frequency band capability (such as B38/B41) and supporting multi-band indication The enhanced base station supports the ability of overlapping frequency bands (such as B38/B41) but does not support the handover between base stations of multi-band indication enhancement) as an example, for example, the source cell supports multi-band indication enhancement and B38/B41, and the target cell supports B38/B41 but does not support B38/B41. Support multi-band indication enhancement, so that the terminal that supports B38/B41 and supports multi-band indication enhancement will use B41 access when accessing the source cell, and when switching to the target cell, the source cell will use band41 as the DL-ARFCN to calculate the KeNB *, and the target cell will use band38 to transmit to the terminal, and the terminal will use band38 as the DL-ARFCN to calculate the KeNB*, so the KeNB* of the terminal and the target cell will be inconsistent, resulting in the failure of the X2 interface handover.

Based on this, the following embodiments of the present invention are proposed.

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

Example 1

The embodiment of the present invention provides a handover method. FIG. 1 is a schematic flowchart of a handover method according to Embodiment 1 of the present invention; as shown in FIG. 1 , the method includes:

Step 101: The source base station sends a handover request message carrying specific information to the target base station; the specific information is used by the target base station to select a frequency point for the terminal to access.

Step 102: Receive a handover request response message from the target base station; the handover request response message includes handover frequency point information.

Step 103: Send a handover command to the terminal; the handover command includes handover frequency information.

In this embodiment, after receiving the measurement report of the terminal, the source base station determines to initiate a handover operation corresponding to the terminal.

As an implementation manner, before the source base station sends a handover request message carrying specific information to the target base station, the method further includes: the source base station analyzes the capability of the target base station, the terminal capability and the target handover frequency point, Whether to add specific information to the handover request message is determined based on the analysis result.

In this embodiment, the source base station analyzes the capability of the target base station, the terminal capability and the target handover frequency, and determines whether to add specific information to the handover request message based on the analysis result, including:

When the target base station supports overlapping frequency bands, the terminal supports overlapping frequency bands, and the target handover frequency is an overlapping frequency band, determining that specific information is added to the handover request message;

Correspondingly, when the target base station does not support overlapping frequency bands, or the terminal does not support overlapping frequency bands, or the target handover frequency is not an overlapping frequency band, it is determined that the specific information is not added to the handover request message.

Specifically, FIG. 2 is a schematic flowchart of a source base station determining whether to add specific information to a handover request in Embodiment 1 of the present invention; as shown in FIG. 2 , the method includes:

Step 201: The source base station determines to initiate a handover operation.

Step 202: Determine whether the terminal supports the overlapping frequency band; when it is determined that the terminal supports the overlapping frequency band, step 203 is performed; when it is determined that the terminal does not support the overlapping frequency band, step 206 is performed.

Step 203 : determine whether the target base station supports overlapping frequency bands; when it is determined that the target base station supports overlapping frequency bands, go to step 204 ; when it is determined that the target base station does not support overlapping frequency bands, go to step 206 .

Step 204 : determine whether the target switching frequency is an overlapping frequency band; when it is determined that the target switching frequency is an overlapping frequency band, go to step 205 ; when it is determined that the target switching frequency is not an overlapping frequency band, go to step 206 .

Step 205: Add specific information to the handover request.

Step 206: Process the handover operation according to the existing protocol.

In this embodiment, specific information is added in the handover request (HANDOVER_REQUEST) message; the specific information may specifically be AS Security Information (Special) information. Specifically, the handover request (HANDOVER_REQUEST) message in this embodiment can be represented by Table 1; it can be seen from Table 1 that a new field is added to the handover request (HANDOVER_REQUEST) message in this embodiment, the field Used to identify AS Security Information (Special) information, that is, when it is determined that the target base station supports overlapping frequency bands, the terminal supports overlapping frequency bands, and the target switching frequency is an overlapping frequency band based on the determination method shown in FIG. 2 , add AS SecurityInformation (Special) information in the field; correspondingly, when it is determined that the target base station does not support overlapping frequency bands, or that the terminal does not support overlapping frequency bands, or that the target switching frequency is not an overlapping frequency band, the same as the existing The protocol switching process is the same, and no AS Security Information (Special) information is added to the field. Specifically, the specific information includes: source base station encryption key (KeNBsrc), terminal resident frequency and network color code (NCC, Next Hop Chaining Count). That is, the ASSecurity Information (Special) information includes: the source base station encryption key (KeNBsrc), the terminal resident frequency, and the NCC. Specifically, the specific information (ie, AS Security Information (Special) information) can be shown in Table 2.

Table 1

Table 2

In this embodiment, the source base station receives a handover request response message from the target base station; the handover request response message includes handover frequency information; the handover frequency information may include: handover frequency and NCC; the source The base station sends a handover command to the terminal; the handover command includes the handover frequency point information; the handover frequency point information may include: the handover frequency point and the NCC. After the terminal receives the handover command from the source base station, based on the handover frequency and NCC in the handover command, the encryption key (KeNBsrc) is calculated in combination with the encryption key (KeNBsrc) of the source base station, so that the terminal can obtain by calculation. The encryption key (KeNBsrc) obtained by the target base station and the encryption key (KeNBsrc) calculated by the target base station perform an integrity authentication process, so that the terminal and the target base station can communicate.

By adopting the technical solution of the embodiment of the present invention, the source base station analyzes and determines according to the terminal capability, the target base station capability and the target handover frequency, adds a piece of information to the handover request message, The base station can select a suitable handover frequency point for the terminal to access according to the capability of the terminal, thereby solving the problem of handover failure in overlapping frequency bands and ensuring the success of the handover of the terminal.

Embodiment 2

The embodiment of the present invention also provides a handover method. FIG. 3 is a schematic flowchart of a handover method according to Embodiment 2 of the present invention; as shown in FIG. 3 , the method includes:

Step 301: The target base station receives a handover request message from the source base station.

Step 302: When the handover request message includes specific information and the target base station supports overlapping frequency bands, the target base station obtains the frequency based on the terminal capability, the terminal camping frequency carried in the specific message, and the preset handover rule. Toggle frequency information.

Step 303: The target base station sends a handover request response message carrying the handover frequency point information to the source base station.

Specifically, FIG. 4 is a schematic flowchart of a target base station selecting a switching frequency point in Embodiment 2 of the present invention; as shown in FIG. 4 , the process of selecting a switching frequency point by the target base station includes:

Step 401: The target base station receives a handover request message from the source base station.

Step 402 : the target base station determines whether it supports overlapping frequency bands; when it determines that it supports overlapping frequency bands, executes step 403 ; when it determines that it does not support overlapping frequency bands, executes step 406 .

Step 403: Detect whether there is specific information in the handover request message; when it is determined that there is specific information in the handover request message, perform steps 404 to 405; when it is determined that there is no specific information in the handover request message, perform step 406.

Step 404: Extract specific information in the handover request message.

Step 405: Determine the switching frequency point according to the terminal capability and the preset switching rule, and calculate the encryption key.

Step 406: Process according to the existing protocol.

In this embodiment, the target base station receives a handover request (HANDOVER_REQUEST) message from the source base station, and determines whether the handover request message carries a specific message. For details of the handover request message, refer to Table 1 in Embodiment 1, and the specific information may be AS Security Information (Special) information. It is specifically determined whether the handover request message carries AS Security Information (Special); when it is determined that the handover request message does not carry AS Security Information (Special), it is processed according to the processing flow of the existing protocol; when it is determined that the handover request message does not carry AS Security Information (Special) When the request message carries AS Security Information (Special) information, and the target base station supports overlapping frequency bands, the target base station is based on the terminal capability, the terminal residency frequency in the AS Security Information (Special) (for example, as shown in Table 2). EARFCN) and the preset switching rule to select the switching frequency.

Specifically, in this embodiment, the obtaining handover frequency information according to the terminal capability, the terminal resident frequency carried in the specific message, and the preset handover rule includes:

When the preset handover rule indicates that the terminal camping frequency point is the first priority, the target base station selects the terminal camping frequency point as the handover frequency point;

When the preset handover rule indicates that the largest frequency band in the overlapping frequency bands is the first priority, the target base station selects the largest frequency band as the handover frequency point;

When the preset handover rule indicates that the frequency selected by the terminal initially accesses the target base station as the handover frequency, the target base station selects the frequency initially accessed by the terminal as the handover frequency according to the terminal capability.

And, as an implementation manner, the specific information further includes: source base station encryption key and NCC; then the target base station calculates the encryption key based on the source base station encryption key, NCC and the handover frequency.

For example, if the operator's handover rule requires that the terminal's current camping frequency is the first priority, the target base station preferentially selects the terminal's current camping frequency as the handover frequency; and, the target base station is based on the source station key (KeNBsrc) , NCC, and the selected handover frequency point (EARFCN) to calculate an encryption key (KeNBdst) for the target base station and the terminal to perform an integrity authentication process, so that the terminal and the target base station can communicate.

For another example, if the operator's handover rules require that the large and medium frequency bands in the overlapping frequency bands are the first priority (such as B38/B41 overlapping frequency bands, B41 is preferred). B41) as the handover frequency point; and, the target base station calculates the encryption key (KeNBdst) according to the source station key (KeNBsrc), NCC, and the selected handover frequency point (EARFCN) for the target base station and the terminal to perform integrity authentication process, thereby enabling the terminal and the target base station to communicate.

For another example, the operator's handover rule selects the frequency selected by the terminal for initial access to the target base station as the handover frequency, and the target base station judges according to the terminal capability, and selects the frequency selected by the terminal for initial access as the handover frequency; and, The target base station calculates an encryption key (KeNBdst) according to the source station key (KeNBsrc), NCC, and the selected handover frequency point (EARFCN) for the target base station and the terminal to perform an integrity authentication process, so that the terminal and the terminal can perform an integrity authentication process. The target base station is capable of communication.

Further, the target base station adds the handover frequency point information (the handover frequency point information may specifically include the handover frequency point and NCC) to the handover request response (HANDOVER REQUEST ACKNOWLEDGE) message, and sends the handover request response message to the A source base station, where the source base station sends the handover frequency point information to the terminal.

By adopting the technical solution of the embodiment of the present invention, the source base station analyzes and determines according to the terminal capability, the target base station capability and the target handover frequency, adds a piece of information to the handover request message, The base station can select a suitable handover frequency point for the terminal to access according to the capability of the terminal, thereby solving the problem of handover failure in overlapping frequency bands and ensuring the success of the handover of the terminal.

Embodiment 3

The embodiment of the present invention also provides a handover method. FIG. 5 is a schematic flowchart of a handover method according to Embodiment 3 of the present invention; as shown in FIG. 5 , the method includes:

Step 501: User Equipment (UE) sends a measurement report to the source base station.

Step 502: The source base station receives the measurement report and determines that when a handover operation is initiated, it analyzes the capability of the target base station, the terminal capability, and the target handover frequency, and based on the analysis result, it is determined whether to increase the value in the handover request (HANDOVER_REQUEST) message. AS Security Information (Special). For the specific method of determining whether to add AS Security Information (Special) in the handover request (HANDOVER_REQUEST) message, reference may be made to the method described in Embodiment 1, which will not be repeated here.

Step 503: The source base station sends the handover request (HANDOVER_REQUEST) message to the target base station.

Step 504: The target base station receives the handover request (HANDOVER_REQUEST) message from the source base station, and detects whether the HANDOVER_REQUEST contains AS Security Information (Special); when it is determined that the HANDOVER_REQUEST contains AS Security Information (Special), the AS Security Information (Special) includes : source base station encryption key (KeNBsrc), terminal resident frequency and NCC; the target base station extracts the source base station encryption key (KeNBsrc), terminal resident frequency and NCC, according to the terminal capability, terminal resident frequency The switching frequency points are selected according to the point and the preset switching rule, and the specific selection method of the switching frequency points can be referred to as described in the second embodiment, which will not be repeated here. The selected handover frequency point and NCC are added to the handover request response (HANDOVER REQUESTACKNOWLEDGE) message.

Step 505: The target base station sends a HANDOVER REQUEST ACKNOWLEDGE message to the source base station.

Step 506: The source base station sends a handover command to the UE, where the handover command carries the handover frequency and NCC. The UE calculates the encryption key (KeNBsrc) based on the handover frequency and NCC in the handover command and in combination with the encryption key (KeNBsrc) of the source base station, so that the terminal and the target base station can perform the integrity authentication process, so that the terminal can perform the integrity authentication process. and can communicate with the target base station.

By adopting the technical solution of the embodiment of the present invention, the source base station analyzes and determines according to the terminal capability, the target base station capability and the target handover frequency, adds a piece of information to the handover request message, The base station can select a suitable handover frequency point for the terminal to access according to the capability of the terminal, thereby solving the problem of handover failure in overlapping frequency bands and ensuring the success of the handover of the terminal.

Embodiment 4

An embodiment of the present invention further provides a base station, where the base station is a source base station. FIG. 6 is a schematic diagram of a first composition structure of a base station according to an embodiment of the present invention; as shown in FIG. 6, a first sending unit 61 and a first receiving unit 62; wherein,

The first sending unit 61 is configured to send a handover request message carrying specific information to the target base station; the specific information is used by the target base station to select a frequency point for the terminal to access;

The first receiving unit 62 is configured to receive a handover request response message of the target base station; the handover request response message includes handover frequency point information;

The first sending unit 61 is further configured to send a handover command to the terminal; the handover command includes handover frequency point information.

As an implementation manner, the base station further includes a first processing unit 63, which is used for checking the capabilities of the target base station, terminal capabilities, and target The handover frequency point is analyzed, and based on the analysis result, it is determined whether to add specific information to the handover request message.

In this embodiment, after the first receiving unit 62 receives the measurement report of the terminal, the first processing unit 63 determines to initiate a handover operation corresponding to the terminal.

In this embodiment, the first processing unit 63 is configured to determine that in the handover request message when the target base station supports overlapping frequency bands, the terminal supports overlapping frequency bands, and the target handover frequency is an overlapping frequency band Add specific information. Correspondingly, the first processing unit 63 is configured to determine that in the handover request message when the target base station does not support overlapping frequency bands, or the terminal does not support overlapping frequency bands, or the target switching frequency point is not an overlapping frequency band The specific information is not added.

In this embodiment, the first processing unit 63 adds specific information in the handover request (HANDOVER_REQUEST) message; the specific information may specifically be AS Security Information (Special) information. Specifically, the handover request (HANDOVER_REQUEST) message described in this embodiment can be represented by Table 1; it can be seen from Table 1 that a new field is added to the handover request (HANDOVER_REQUEST) message described in this embodiment, the field Used to identify ASSecurity Information (Special) information, that is, when it is determined that the target base station supports overlapping frequency bands, the terminal supports overlapping frequency bands, and the target switching frequency is an overlapping frequency band based on the judgment method shown in FIG. 2 , Add AS Security Information (Special) information in the field; correspondingly, when it is determined that the target base station does not support overlapping frequency bands, or that the terminal does not support overlapping frequency bands, or that the target switching frequency is not an overlapping frequency band, the same as the existing The protocol switching process is the same, and no AS Security Information (Special) information is added to the field. Specifically, the specific information includes: source base station encryption key (KeNBsrc), terminal resident frequency, and network color code (NCC, Next HopChaining Count). That is, the AS Security Information (Special) information includes: source base station encryption key (KeNBsrc), terminal resident frequency and NCC. Specifically, the specific information (ie, AS Security Information (Special) information) can be shown in Table 2.

As an implementation manner, after the first sending unit 61 sends the handover request message to the target base station, the first receiving unit 62 is further configured to receive a handover request response message from the target base station; The handover request response message includes handover frequency information; the first sending unit 61 is further configured to send a handover command to the terminal; the handover command includes handover frequency information. After the terminal receives the handover command from the source base station, based on the handover frequency point information in the handover command (the handover frequency point information may include the handover frequency point and NCC), combined with the source base station encryption key (KeNBsrc) An encryption key (KeNBsrc) is calculated to facilitate the integrity authentication process between the terminal and the target base station, so that the terminal and the target base station can communicate.

Those skilled in the art should understand that the functions of each processing unit in the source base station in the embodiment of the present invention can be understood by referring to the relevant description of the aforementioned handover method, and each processing unit in the source base station in the embodiment of the present invention can be implemented by implementing the present invention. It is realized by an analog circuit of the functions described in the embodiments of the present invention, and it can also be realized by running the software for executing the functions described in the embodiments of the present invention on the intelligent terminal.

In this embodiment of the present invention, the first processing unit 63 in the source base station may be composed of a central processing unit (CPU, Central Processing Unit), a digital signal processor (DSP, Digital Signal) in the source base station in practical applications Processor) or Field-Programmable Gate Array (FPGA, Field-Programmable Gate Array); the first transmitting unit 61 and the first receiving unit 62 in the source base station can be implemented by the transceiver antenna in the source base station in practical applications .

Embodiment 5

An embodiment of the present invention further provides a base station, where the base station is a target base station. FIG. 7 is a schematic diagram of a second composition structure of a base station according to an embodiment of the present invention; as shown in FIG. 7 , the base station includes: a second receiving unit 71, a second processing unit 72 and a second sending unit 73; wherein,

The second receiving unit 71 is configured to receive the handover request message of the source base station;

The second processing unit 72 is configured to, when the handover request message received by the second receiving unit 71 includes specific information and the target base station supports overlapping frequency bands, according to the terminal capability, the specific message carries the information. The terminal resident frequency point and the preset switching rule are obtained to obtain the switching frequency point;

The second sending unit 73 is configured to send a handover request response message carrying the handover frequency point information to the source base station.

In this embodiment, the second receiving unit receives a handover request (HANDOVER_REQUEST) message from the source base station; the second processing unit 72 determines whether the handover request message carries a specific message. For details of the handover request message, refer to Table 1 in Embodiment 1, and the specific information may be AS Security Information (Special) information. The second processing unit 72 specifically determines whether the handover request message carries AS Security Information (Special); when it is determined that the handover request message does not carry AS Security Information (Special), then according to the processing flow of the existing protocol processing; when it is determined that the handover request message carries ASSecurity Information (Special) and the target base station supports overlapping frequency bands, the second processing unit 72 determines that the terminal capability in the AS Security Information (Special) Dwell frequency and preset switching rule to select switching frequency.

Specifically, in this embodiment, the second processing unit 72 is configured to select the terminal resident frequency as the switching frequency when the preset switching rule indicates that the terminal resident frequency is the first priority; When the preset handover rule indicates that the largest frequency band in the overlapping frequency bands is the first priority, the largest frequency band is selected as the handover frequency; When the frequency point is selected, the frequency point initially accessed by the terminal is selected as the handover frequency point according to the capability of the terminal.

And, as an implementation manner, the specific information further includes: the source base station encryption key and NCC; then the second processing unit 72 is further configured to encrypt the source base station encryption key, NCC and the switching frequency based on the source base station Click Calculate encryption key.

For example, if the operator's handover rule requires that the terminal's current camping frequency is the first priority, the target base station preferentially selects the terminal's current camping frequency as the handover frequency; and, the target base station is based on the source station key (KeNBsrc) , NCC, and the selected handover frequency point (EARFCN) to calculate an encryption key (KeNBdst) for the target base station and the terminal to perform an integrity authentication process, so that the terminal and the target base station can communicate.

For another example, if the operator's handover rules require that the large and medium frequency bands in the overlapping frequency bands are the first priority (such as B38/B41 overlapping frequency bands, B41 is preferred). B41) as the handover frequency point; and, the target base station calculates the encryption key (KeNBdst) according to the source station key (KeNBsrc), NCC, and the selected handover frequency point (EARFCN) for the target base station and the terminal to perform integrity authentication process, thereby enabling the terminal and the target base station to communicate.

For another example, the operator's handover rule selects the frequency selected by the terminal for initial access to the target base station as the handover frequency, and the target base station judges according to the terminal capability, and selects the frequency selected by the terminal for initial access as the handover frequency; and, The target base station calculates an encryption key (KeNBdst) according to the source station key (KeNBsrc), NCC, and the selected handover frequency point (EARFCN) for the target base station and the terminal to perform an integrity authentication process, so that the terminal and the terminal can perform an integrity authentication process. The target base station is capable of communication.

Further, the second processing unit 72 adds the handover frequency information (the handover frequency information may specifically include the handover frequency and NCC) to the handover request response (HANDOVER REQUEST ACKNOWLEDGE) message, and the second sending unit The handover request response message is sent to the source base station, and the source base station sends the handover frequency point information to the terminal.

Those skilled in the art should understand that the functions of each processing unit in the target base station in the embodiment of the present invention can be understood by referring to the relevant description of the aforementioned handover method, and each processing unit in the target base station in the embodiment of the present invention can be implemented by implementing the present invention. It is realized by an analog circuit of the functions described in the embodiments of the present invention, and it can also be realized by running the software for executing the functions described in the embodiments of the present invention on the intelligent terminal.

In this embodiment of the present invention, the second processing unit 72 in the target base station may be implemented by a CPU, DSP or FPGA in the target base station in practical applications; the second receiving unit in the target base station and the first The second sending unit 73 can be implemented by the transceiver antenna in the target base station in practical application.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the coupling, or direct coupling, or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical or other forms. of.

The unit described above as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may all be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integration The unit can be implemented either in the form of hardware or in the form of hardware plus software functional units.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by program instructions related to hardware, the aforementioned program can be stored in a computer-readable storage medium, and when the program is executed, execute Including the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk and other various A medium on which program code can be stored.

Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present invention may be embodied in the form of software products in essence or the parts that make contributions to the prior art. The computer software products are stored in a storage medium and include several instructions for A computer device (which may be a personal computer, a server, or a network device, etc.) is caused to execute all or part of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic disk or an optical disk and other mediums that can store program codes.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (13)

1. A method of handover, the method comprising:

a source base station sends a switching request message carrying specific information to a target base station; the specific information is used for the target base station to select a frequency point for the terminal to access;

receiving a switching request response message of the target base station; the switching request response message comprises switching frequency point information;

sending a switching command to the terminal; the switching command comprises switching frequency point information;

before the source base station sends a handover request message carrying specific information to a target base station, the method further includes:

and the source base station analyzes the capability of the target base station, the terminal capability and the target switching frequency point, and judges whether specific information is added in the switching request message or not based on the analysis result.

2. The method of claim 1, wherein the analyzing the capability of the target base station, the terminal capability and the target handover frequency point, and determining whether to add specific information in the handover request message based on the analysis result comprises:

and when the target base station supports the overlapped frequency band, the terminal supports the overlapped frequency band and the target switching frequency point is the overlapped frequency band, judging that specific information is added in the switching request message.

3. The method of claim 1, wherein the analyzing the capability of the target base station, the terminal capability and the target handover frequency point, and determining whether to add specific information in the handover request message based on the analysis result comprises:

and when the target base station does not support the overlapped frequency band, or the terminal does not support the overlapped frequency band, or the target switching frequency point is not the overlapped frequency band, judging that the specific information is not added in the switching request message.

4. The method according to any one of claims 1 to 3, wherein the specific information includes: and the source base station encrypts the secret key, the terminal resident frequency point and the network color code NCC.

5. A method of handover, the method comprising:

a target base station receives a switching request message of a source base station;

when the switching request message comprises specific information and the target base station supports overlapped frequency bands, acquiring switching frequency point information according to terminal capacity, a terminal resident frequency point carried in the specific information and a preset switching rule; the specific information is used for the target base station to select a frequency point for the terminal to access; the specific message is that the source base station analyzes the capability of the target base station, the terminal capability and the target switching frequency point, and judges whether to increase in the switching request message or not based on the analysis result;

and the target base station sends a switching request response message carrying the switching frequency point information to the source base station.

6. The method according to claim 5, wherein the obtaining of the information of the handover frequency point according to the terminal capability, the terminal camping frequency point carried in the specific message, and a preset handover rule comprises:

when a preset switching rule indicates that a terminal residing frequency point is a first priority, the target base station selects the terminal residing frequency point as a switching frequency point;

when a preset switching rule indicates that the largest frequency band in the overlapped frequency bands is a first priority, the target base station selects the largest frequency band as a switching frequency point;

and when the preset switching rule indicates that the frequency point selected according to the initial access of the terminal to the target base station is taken as the switching frequency point, the target base station selects the frequency point initially accessed by the terminal as the switching frequency point according to the terminal capability.

7. The method of claim 5, wherein the specific information further comprises: encrypting the secret key and the NCC by the source base station; the method further comprises the following steps:

and calculating an encryption key based on the encryption key of the source base station, the NCC and the switching frequency point.

8. A base station, the base station being a source base station; characterized in that the base station comprises: a first transmitting unit and a first receiving unit; wherein,

the first sending unit is used for sending a switching request message carrying specific information to a target base station; the specific information is used for the target base station to select a frequency point for the terminal to access;

the first receiving unit is configured to receive a handover request response message of the target base station; the switching request response message comprises switching frequency point information;

the first sending unit is further configured to send a handover command to the terminal; the switching command comprises switching frequency point information;

the base station also comprises a first processing unit, which is used for analyzing the capability of the target base station, the terminal capability and the target switching frequency point before the first sending unit sends the switching request message carrying the specific information to the target base station, and judging whether the specific information is added in the switching request message or not based on the analysis result.

9. The base station of claim 8, wherein the first processing unit is configured to determine to add specific information to the handover request message when the target base station supports an overlapped frequency band, the terminal supports an overlapped frequency band, and the target handover frequency point is an overlapped frequency band.

10. The base station of claim 8, wherein the first processing unit is configured to determine not to add the specific information in the handover request message when the target base station does not support an overlapping frequency band, or the terminal does not support an overlapping frequency band, or the target handover frequency point is not an overlapping frequency band.

11. A base station, the base station being a target base station; characterized in that the base station comprises: the second receiving unit, the second processing unit and the second sending unit; wherein,

the second receiving unit is configured to receive a handover request message of a source base station;

the second processing unit is configured to obtain a handover frequency point according to a terminal capability, a terminal residing frequency point carried in the specific message, and a preset handover rule when the handover request message received by the second receiving unit includes specific information and the target base station supports overlapping frequency bands; the specific information is used for the target base station to select a frequency point for the terminal to access; the specific message is that the source base station analyzes the capability of the target base station, the terminal capability and the target switching frequency point, and judges whether to increase in the switching request message or not based on the analysis result;

and the second sending unit is used for sending a switching request response message carrying the switching frequency point information to the source base station.

12. The base station of claim 11, wherein the second processing unit is configured to select the terminal residing frequency point as a handover frequency point when a preset handover rule indicates that the terminal residing frequency point is of a first priority; when the preset switching rule indicates that the largest frequency band in the overlapped frequency bands is the first priority, selecting the largest frequency band as a switching frequency point; and when the preset switching rule indicates that the frequency point selected according to the initial access of the terminal to the target base station is taken as the switching frequency point, selecting the frequency point initially accessed by the terminal as the switching frequency point according to the terminal capability.

13. The base station of claim 11, wherein the specific information further comprises: encrypting the secret key and the NCC by the source base station;

the second processing unit is further configured to calculate an encryption key based on the source base station encryption key, the NCC, and the handover frequency point.

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