CN107371197B - Switching method and base station - Google Patents

Switching method and base station Download PDF

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Publication number
CN107371197B
CN107371197B CN201610312290.2A CN201610312290A CN107371197B CN 107371197 B CN107371197 B CN 107371197B CN 201610312290 A CN201610312290 A CN 201610312290A CN 107371197 B CN107371197 B CN 107371197B
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base station
frequency point
switching
terminal
handover
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CN107371197A (en
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翁玮文
王苗
曹蕾
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a switching method and a base station. The method comprises the following steps: 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.

Description

Switching method and base station
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a handover method and a base station.
Background
The different BAND classes defined by the current 3GPP 3rd Generation Partnership Project (3 GPP) standards overlap each other, such as BAND38(TD-LTE, 2570-2620 MHz), BAND41(TD-LTE, 2496-2690MHz) and BAND7(LTE-FDD uplink: 2500 + 2570MHz and downlink: 2620 + 2690MHz), it can be seen that BAND41 includes BAND38 and BAND 7. If the operator obtains the BAND38 and the BAND41 at the same time, and the network device takes the BAND38 as the main frequency BAND and the BAND41 as the auxiliary frequency BAND. In this case, the terminal with overlapped band capability (e.g. B38/B41) and supporting multi-band indication enhancement switches the X2 interface between different types of base stations, for example, from a base station supporting overlapped band capability (e.g. B38/B41) and supporting multi-band indication enhancement to a base station supporting overlapped band capability (e.g. B38/B41) but not supporting multi-band indication enhancement, which may have problems, resulting in a handover failure.
Disclosure of Invention
In order to solve the existing technical problem, 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 purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a switching method, which comprises the following steps:
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.
In the above scheme, before the source base station sends a handover request message carrying specific information to the 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.
In the foregoing solution, 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 includes:
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.
In the foregoing solution, 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 includes:
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.
In the foregoing solution, the specific information includes: the source base station encrypts a secret key, a terminal residing frequency point and a Network Color Code (NCC).
The embodiment of the invention also provides a switching method, which comprises the following steps:
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;
and the target base station sends a switching request response message carrying the switching frequency point information to the source base station.
In the above scheme, the obtaining of the switching frequency point information according to the terminal capability, the terminal residing frequency point carried in the specific message, and the preset switching rule includes:
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.
In the above scheme, the specific information further includes: 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.
The embodiment of the invention also provides a base station, wherein the base station is a source base station; the base station includes: 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.
In the above scheme, the base station further includes a first processing unit, configured to analyze the capability of the target base station, the terminal capability, and the target handover frequency point before the first sending unit sends the handover request message carrying the specific information to the target base station, and determine whether to add the specific information to the handover request message based on an analysis result.
In the foregoing solution, 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 the overlapped frequency band, and the target handover frequency point is an overlapped frequency band.
In the foregoing solution, the first processing unit is configured to determine that the specific information is not added to 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.
The embodiment of the invention also provides a base station, wherein the base station is a target base station; the base station includes: 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;
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.
In the above scheme, the second processing unit is configured to select the terminal residing frequency point as the handover frequency point when a preset handover rule indicates that the terminal residing frequency point is the 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.
In the above scheme, the specific information further includes: 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.
According to the switching method and the base station provided by the embodiment of the invention, on one hand, 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. On the other hand, the target base station receives a switching request message of the source base station; when the switching request message comprises specific information and the target base station supports overlapped frequency bands, acquiring a switching frequency point according to the terminal capability, a terminal residing frequency point carried in the specific information and a preset switching rule; and the target base station sends a switching request response message carrying the switching frequency point information to the source base station. Therefore, by adopting the technical scheme of the embodiment of the invention, the source base station carries out analysis and judgment according to the terminal capability, the target base station capability and the condition of the target switching frequency point, a new piece of information is added in the switching request message, and the target base station can select the proper switching frequency point for the terminal to access according to the terminal capability through the mark in the newly added information, thereby solving the problem of switching failure of the overlapped frequency band and ensuring the success of terminal switching.
Drawings
Fig. 1 is a schematic flowchart of a handover method according to a first embodiment of the present invention;
fig. 2 is a flowchart illustrating a source base station determining whether to add specific information in a handover request according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a handover method according to a second embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating selection of a handover frequency point by a target base station according to a second embodiment of the present invention;
fig. 5 is a flowchart illustrating a handover method according to a third embodiment of the present invention;
fig. 6 is a schematic diagram of a first structure of a base station according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a second structure of a base station according to an embodiment of the present invention.
Detailed Description
The inventor of the present application finds that, in a HANDOVER process based on an X2 interface, according to a 3GPP 36.423 protocol, a source cell needs to carry AS security information (AS SecurityInformation) in a HANDOVER REQUEST (HANDOVER REQUEST) message; the AS Security Information carries Key eNodeB Star Information element (hereinafter, referred to AS KeNB). In accordance with the description in 3GPP 33.401: the source cell uses a Physical Cell Identifier (PCI) of the target cell, a downlink carrier frequency point (DL-EARFCN) and a source cell (KeNB) to calculate the KeNB used by the target cell and send the KeNB to the target cell, and the target cell directly uses the KeNB after receiving the KeNB. After the UE side obtains the handover command (including EARFCN transmitted to the UE by the target base station), KeNB is calculated by the same method.
According to the 3GPP 36.331 protocol, the following is described for Key eNodeB Star: and if the target cell is the cell with the overlapped frequency band, the source cell selects a mode with the same logic as the selection bandwidth (band) of the target cell initially accessed by the UE to calculate the frequency point (ARFCN) of the target side, so that KeNB is calculated.
For the overlapped band cell, for example, a terminal with overlapped band capability (e.g. B38/B41) and supporting multi-band indicator enhancement performs an X2 interface handover between different types of base stations (e.g. handover from a base station supporting overlapped band capability (e.g. B38/B41) and supporting multi-band indicator enhancement to a base station supporting overlapped band capability (e.g. B38/B41) but not supporting multi-band indicator enhancement), such as a source cell supporting multi-band indicator enhancement and B38/B41, a target cell supporting B38/B41 but not supporting multi-band indicator enhancement, so that when the terminal supporting B38/B41 and supporting multi-band indicator enhancement accesses the source cell, B41 is used for accessing, when the terminal switches to the target cell, the source cell uses band41 as DL-ARFCN to calculate KeNB, and the target cell uses band38 to pass to the terminal, and the terminal uses band38 as DL-fcn to calculate KeNB, in this way, KeNB of the terminal and the target cell will not coincide, resulting in a failed handover of the X2 interface.
Based on this, the following examples of the present invention are proposed.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
The embodiment of the invention provides a switching method. Fig. 1 is a schematic flowchart of a handover method according to a first embodiment of the present invention; as shown in fig. 1, the method includes:
step 101: 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.
Step 102: receiving a switching request response message of the target base station; the switching request response message comprises switching frequency point information.
Step 103: sending a switching command to the terminal; the switching command comprises switching frequency point information.
In this embodiment, after receiving a measurement report of a 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: 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.
In this embodiment, the analyzing, by the source base station, 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 an analysis result includes:
when the target base station supports overlapped frequency bands, the terminal supports overlapped frequency bands, and the target switching frequency point is an overlapped frequency band, judging that specific information is added in the switching request message;
correspondingly, 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, it is determined that the specific information is not added in the switching request message.
Specifically, fig. 2 is a schematic flowchart illustrating a process of a source base station determining whether to add specific information in a handover request according to an embodiment 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: judging whether the terminal supports overlapping frequency bands or not; when the terminal is judged to support the overlapped frequency band, executing step 203; when it is determined that the terminal does not support the overlapped frequency band, step 206 is performed.
Step 203: judging whether the target base station supports overlapped frequency bands or not; when the target base station is judged to support the overlapped frequency band, executing step 204; when it is determined that the target base station does not support the overlapped frequency band, step 206 is performed.
Step 204: judging whether the target switching frequency point is an overlapped frequency band or not; when the target switching frequency point is determined to be the overlapping frequency band, executing step 205; when it is determined that the target handover frequency point is not the overlapping frequency band, step 206 is executed.
Step 205: specific information is added to the handover request.
Step 206: the switching operation is handled as specified by the existing protocol.
In this embodiment, specific information is added to a HANDOVER REQUEST (HANDOVER _ REQUEST) message; the specific Information may be AS Security Information (Special) Information. Specifically, the HANDOVER REQUEST (HANDOVER _ REQUEST) message described in this embodiment can be represented by table 1; AS can be seen from table 1, in the present embodiment, a field is newly added in the HANDOVER REQUEST (HANDOVER _ REQUEST) message, where the field is used to identify AS Security Information (Special) Information, that is, when it is determined that the target base station supports an overlapped frequency band, the terminal supports the overlapped frequency band, and the target HANDOVER frequency point is an overlapped frequency band based on the determination manner shown in fig. 2, AS is, Information of AS Security Information (Special) is added in the field; correspondingly, when it is determined that 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, the same AS the existing protocol switching process is performed, and AS Security Information (Special) Information is not added to the field. Specifically, the specific information includes: the source base station encrypts a key (KeNBsrc), a terminal camping frequency point and a Network Color Code (NCC). Namely, the association Information (Special) Information includes: the source base station encrypts a key (KeNBsrc), the terminal camping frequency point and the NCC. Specifically, the specific Information (i.e., AS Security Information (Special) Information) can be shown in table 2.
Figure BDA0000987498710000081
TABLE 1
Figure BDA0000987498710000082
TABLE 2
In this embodiment, the source base station receives a handover request response message of the target base station; the switching request response message comprises switching frequency point information; the switching frequency point information may include: switching frequency points and NCC; the source base station sends a switching command to a terminal; the switching command comprises the switching frequency point information; the switching frequency point information may include: and switching frequency points and NCC. After receiving the handover command of the source base station, the terminal calculates an encryption key (KeNBsrc) by combining an encryption key (KeNBsrc) of the source base station based on the handover frequency point and the NCC in the handover command, so that the terminal performs an integrity authentication process by using the encryption key (KeNBsrc) obtained by calculation and the encryption key (KeNBsrc) obtained by calculation of the target base station, and the terminal and the target base station can communicate with each other.
By adopting the technical scheme of the embodiment of the invention, the source base station analyzes and judges according to the terminal capability, the target base station capability and the condition of the target switching frequency point, a new piece of information is added in the switching request message, and the target base station can select a proper switching frequency point for the terminal to access according to the terminal capability through the identification in the added information, thereby solving the problem of switching failure of an overlapped frequency band and ensuring the success of terminal switching.
Example two
The embodiment of the invention also provides a switching method. Fig. 3 is a flowchart illustrating a handover method according to a second embodiment of the present invention; as shown in fig. 3, the method includes:
step 301: the target base station receives the switching request message of the source base station.
Step 302: and when the switching request message comprises specific information and the target base station supports overlapped frequency bands, the target base station obtains switching frequency point information according to the terminal capability, the terminal residing frequency point carried in the specific information and a preset switching rule.
Step 303: and the target base station sends a switching request response message carrying the switching frequency point information to the source base station.
Specifically, fig. 4 is a schematic flow chart illustrating that a target base station selects a handover frequency point in the second embodiment of the present invention; as shown in fig. 4, the process of selecting but changing frequency points by the target base station includes:
step 401: the target base station receives the switching request message of the source base station.
Step 402: the target base station judges whether the target base station supports overlapped frequency bands or not; when the self supports the overlapped frequency band, executing step 403; when it is determined that the overlapping band is not supported by itself, step 406 is performed.
Step 403: detecting whether specific information exists in the switching request message; when it is determined that the specific information exists in the handover request message, performing steps 404 to 405; when it is determined that the specific information does not exist in the handover request message, step 406 is performed.
Step 404: specific information in the handover request message is extracted.
Step 405: and determining a switching frequency point according to the terminal capability and a preset switching rule, and calculating an encryption key.
Step 406: processing is performed as specified by the existing protocol.
In this embodiment, the target base station receives a HANDOVER REQUEST (HANDOVER _ REQUEST) message of a source base station; and judging whether the switching request message carries a specific message. Specifically, AS shown in table 1 in the first embodiment, the specific Information may be AS Security Information (Special) Information. Specifically, whether the switching request message carries AS Security Information (Special) is judged; when the switching request message is judged not to carry AS Security Information (Special), processing according to the processing flow of the existing protocol; when it is determined that the handover request message carries AS Security Information (Special) Information and the target base station supports overlapping frequency bands, the target base station selects a handover frequency point according to a terminal capability, a terminal residence frequency point (e.g., a residence EARFCN shown in Table 2) in the AS Security Information (Special), and a preset handover rule.
Specifically, in this embodiment, the obtaining of the switching frequency point information according to the terminal capability, the terminal residing frequency point carried in the specific message, and the preset switching rule includes:
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.
And, as an embodiment, the specific information further includes: encrypting the secret key and the NCC by the source base station; the target base station calculates an encryption key based on the encryption key of the source base station, the NCC and the handover frequency point.
For example, if the operator switching rule requires that the current resident frequency point of the terminal is taken as the first priority, the target base station preferentially selects the current resident frequency point of the terminal as the switching frequency point; and the target base station calculates an encryption key (KeNBdst) according to a source station key (KeNBsrc), the NCC and the selected handover frequency point (EARFCN) so as to enable 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, the operator switching rule requires that the large band in the overlapped band is the first priority (e.g., B38/B41 overlapped band, preferably B41), the target base station ignores the current residing frequency point of the terminal, and selects the large band in the overlapped band (e.g., B41) as the switching frequency point; and the target base station calculates an encryption key (KeNBdst) according to a source station key (KeNBsrc), the NCC and the selected handover frequency point (EARFCN) so as to enable 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 switching rule is that the frequency point selected by the terminal initially accessing the target base station is the switching frequency point, the target base station performs judgment according to the terminal capability, and the frequency point selected by the terminal initially accessing is selected as the switching frequency point; and the target base station calculates an encryption key (KeNBdst) according to a source station key (KeNBsrc), the NCC and the selected handover frequency point (EARFCN) so as to enable the target base station and the terminal to perform an integrity authentication process, so that the terminal and the target base station can communicate.
Further, the target base station adds HANDOVER frequency point information (the HANDOVER frequency point information may specifically include a HANDOVER frequency point and an NCC) to a HANDOVER REQUEST response (HANDOVER REQUEST ACKNOWLEDGE) message, sends the HANDOVER REQUEST response message to a source base station, and sends the HANDOVER frequency point information to a terminal by the source base station.
By adopting the technical scheme of the embodiment of the invention, the source base station analyzes and judges according to the terminal capability, the target base station capability and the condition of the target switching frequency point, a new piece of information is added in the switching request message, and the target base station can select a proper switching frequency point for the terminal to access according to the terminal capability through the identification in the added information, thereby solving the problem of switching failure of an overlapped frequency band and ensuring the success of terminal switching.
EXAMPLE III
The embodiment of the invention also provides a switching method. Fig. 5 is a flowchart illustrating a handover method according to a third embodiment of the present invention; as shown in fig. 5, the method includes:
step 501: a User Equipment (UE) sends a measurement report to a source base station.
Step 502: and the source base station receives the measurement report, analyzes the capability of the target base station, the terminal capability and the target switching frequency point when determining to initiate the switching operation, and judges whether AS Security Information (Special) is added in a switching REQUEST (HANDOVER _ REQUEST) message or not based on the analysis result. The specific method for determining whether to add the AS Security Information (specific) to the HANDOVER REQUEST (HANDOVER _ REQUEST) message may be AS described in the first embodiment, and will not be described herein.
Step 503: the source base station transmits the HANDOVER REQUEST (HANDOVER _ REQUEST) message to the target base station.
Step 504: the target base station receives a HANDOVER REQUEST (HANDOVER _ REQUEST) message of 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: a source base station encryption key (KeNBsrc), a terminal resident frequency point and NCC; the target base station extracts a source base station encryption key (KeNBsrc), a terminal residing frequency point and an NCC, and selects a switching frequency point according to a terminal capability, the terminal residing frequency point and a preset switching rule, wherein a selection manner of the switching frequency point may specifically refer to that described in embodiment two, and details are not repeated here. Adding the selected HANDOVER frequency point and NCC to a HANDOVER request response (HANDOVER REQUEST NOWLEDGE) message.
Step 505: the target base station sends a HANDOVER REQUEST response (HANDOVER ACKNOWLEDGE) message to the source base station.
Step 506: and the source base station sends a switching command to the UE, wherein the switching command carries a switching frequency point and an NCC. And the UE calculates an encryption key (KeNBsrc) by combining a source base station encryption key (KeNBsrc) based on the switching frequency point and the NCC in the switching command so as to facilitate the integrity authentication process between the terminal and the target base station, thereby enabling the terminal and the target base station to communicate.
By adopting the technical scheme of the embodiment of the invention, the source base station analyzes and judges according to the terminal capability, the target base station capability and the condition of the target switching frequency point, a new piece of information is added in the switching request message, and the target base station can select a proper switching frequency point for the terminal to access according to the terminal capability through the identification in the added information, thereby solving the problem of switching failure of an overlapped frequency band and ensuring the success of terminal switching.
Example four
The embodiment of the invention also provides a base station, which is a source base station. Fig. 6 is a schematic diagram of a first structure of a base station according to an embodiment of the present invention; as shown in fig. 6, a first transmitting 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 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 62 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 61 is further configured to send a handover command to the terminal; the switching command comprises switching frequency point information.
As an implementation manner, the base station further includes a first processing unit 63, configured to analyze the capability of the target base station, the terminal capability, and the target handover frequency point before the first sending unit 61 sends the handover request message carrying the specific information to the target base station, and determine whether to add the specific information in the handover request message based on an analysis result.
In this embodiment, after the first receiving unit 62 receives a measurement report of a 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 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. Correspondingly, the first processing unit 63 is configured to determine that the specific information is not added in the handover request message when the target base station does not support the overlapping frequency band, or the terminal does not support the overlapping frequency band, or the target handover frequency point is not the overlapping frequency band.
In this embodiment, the first processing unit 63 adds specific information to a HANDOVER REQUEST (HANDOVER _ REQUEST) message; the specific Information may be AS Security Information (Special) Information. Specifically, the HANDOVER REQUEST (HANDOVER _ REQUEST) message described in this embodiment can be represented by table 1; AS can be seen from table 1, in the present embodiment, a field is newly added in the HANDOVER REQUEST (HANDOVER _ REQUEST) message, where the field is used to identify association Information (Special) Information, that is, when it is determined that the target base station supports an overlapped frequency band, the terminal supports the overlapped frequency band, and the target HANDOVER frequency point is an overlapped frequency band based on the determination manner shown in fig. 2, AS Security Information (Special) Information is added to the field; correspondingly, when it is determined that 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, the same AS the existing protocol switching process is performed, and AS Security Information (Special) Information is not added to the field. Specifically, the specific information includes: the source base station encrypts a key (KeNBsrc), a terminal camping frequency point, and a network color code (NCC, Next hopcoding Count). Namely AS Security Information (Special) Information, including: the source base station encrypts a key (KeNBsrc), the terminal camping frequency point and the NCC. Specifically, the specific Information (i.e., AS Security Information (Special) Information) can be shown in table 2.
As an embodiment, 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 of the target base station; the switching request response message comprises switching frequency point information; the first sending unit 61 is further configured to send a handover command to the terminal; the switching command comprises switching frequency point information. After receiving the switching command of the source base station, the terminal calculates an encryption key (KeNBsrc) by combining an encryption key (KeNBsrc) of the source base station based on switching frequency point information (the switching frequency point information may include a switching frequency point and NCC) in the switching command, so that the integrity authentication process of the terminal and the target base station is facilitated, and the terminal and the target base station can communicate.
It should be understood by those skilled in the art that, the functions of each processing unit in the source base station according to the embodiment of the present invention may be understood by referring to the description related to the foregoing handover method, and each processing unit in the source base station according to the embodiment of the present invention may be implemented by an analog circuit that implements the functions described in the embodiment of the present invention, or may be implemented by running software that performs the functions described in the embodiment of the present invention on an intelligent terminal.
In the embodiment of the present invention, the first Processing Unit 63 in the source base station can be implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or a Programmable Gate Array (FPGA) in the source base station in practical application; the first transmitting unit 61 and the first receiving unit 62 in the source base station may be implemented by a transceiving antenna in the source base station in practical applications.
EXAMPLE five
The embodiment of the invention also provides a base station, which is a target base station. Fig. 7 is a schematic diagram of a second 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 transmitting unit 73; wherein,
the second receiving unit 71 is configured to receive a handover request message of a 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, obtain a handover frequency point according to a terminal capability, a terminal residing frequency point carried in the specific information, and a preset handover rule;
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. Specifically, AS shown in table 1 in the first embodiment, 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 the switching request message is judged not to carry AS Security Information (Special), processing according to the processing flow of the existing protocol; when it is determined that the handover request message carries the association Information (Special) and the target base station supports the overlapped frequency band, the second processing unit 72 selects the handover frequency point according to the terminal capability, the terminal residence frequency point in the AS Security Information (Special) and a preset handover rule.
Specifically, in this embodiment, the second processing unit 72 is configured to select the terminal residing frequency point as the handover frequency point when a preset handover rule indicates that the terminal residing frequency point is the 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.
And, as an embodiment, the specific information further includes: encrypting the secret key and the NCC by the source base station; the second processing unit 72 is further configured to calculate an encryption key based on the source base station encryption key, the NCC, and the handover frequency point.
For example, if the operator switching rule requires that the current resident frequency point of the terminal is taken as the first priority, the target base station preferentially selects the current resident frequency point of the terminal as the switching frequency point; and the target base station calculates an encryption key (KeNBdst) according to a source station key (KeNBsrc), the NCC and the selected handover frequency point (EARFCN) so as to enable 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, the operator switching rule requires that the large band in the overlapped band is the first priority (e.g., B38/B41 overlapped band, preferably B41), the target base station ignores the current residing frequency point of the terminal, and selects the large band in the overlapped band (e.g., B41) as the switching frequency point; and the target base station calculates an encryption key (KeNBdst) according to a source station key (KeNBsrc), the NCC and the selected handover frequency point (EARFCN) so as to enable 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 switching rule is that the frequency point selected by the terminal initially accessing the target base station is the switching frequency point, the target base station performs judgment according to the terminal capability, and the frequency point selected by the terminal initially accessing is selected as the switching frequency point; and the target base station calculates an encryption key (KeNBdst) according to a source station key (KeNBsrc), the NCC and the selected handover frequency point (EARFCN) so as to enable the target base station and the terminal to perform an integrity authentication process, so that the terminal and the target base station can communicate.
Further, the second processing unit 72 adds HANDOVER frequency point information (the HANDOVER frequency point information may specifically include a HANDOVER frequency point and an NCC) to a HANDOVER REQUEST response (HANDOVER REQUEST ACKNOWLEDGE) message, and the second sending unit sends the HANDOVER REQUEST response message to the source base station, and the source base station sends the HANDOVER frequency point information to the terminal.
It should be understood by those skilled in the art that the functions of each processing unit in the target base station according to the embodiment of the present invention may be understood by referring to the description of the foregoing handover method, and each processing unit in the target base station according to the embodiment of the present invention may be implemented by an analog circuit that implements the functions described in the embodiment of the present invention, or may be implemented by running software that performs the functions described in the embodiment of the present invention on an intelligent terminal.
In the embodiment of the present invention, the second processing unit 72 in the target base station can be implemented by a CPU, a DSP, or an FPGA in the target base station in practical application; the second receiving unit and the second transmitting unit 73 in the target base station may be implemented by a transceiving antenna in the target base station in practical applications.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended 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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