CN110012513B - Switching method, base station and computer readable storage medium - Google Patents
Switching method, base station and computer readable storage medium Download PDFInfo
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- CN110012513B CN110012513B CN201810009341.3A CN201810009341A CN110012513B CN 110012513 B CN110012513 B CN 110012513B CN 201810009341 A CN201810009341 A CN 201810009341A CN 110012513 B CN110012513 B CN 110012513B
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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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Abstract
The embodiment of the invention provides a switching method, a base station and a computer readable storage medium. The embodiment of the invention can make the switched candidate base station ready for admission control processing in advance before the terminal is formally switched, and establish the operation such as relevant access layer configuration for the terminal, and the service base station can obtain the candidate base station which allows the terminal to be admitted, so that the service base station can select the target base station from the candidate base station which allows the terminal to be admitted when in subsequent switching.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a handover method, a base station, and a computer-readable storage medium.
Background
The unmanned aerial vehicle and the base station can communicate in a wireless mode. It has been found through simulation that when a drone is close to the ground, the strongest signal it receives is usually from the closest base station. As shown in fig. 1, as the altitude of the drone increases, the cells begin to split and the strongest signal may come from a cell that is farther away. This is because the antenna of the base station is usually down-tilted. On the ground, the antenna main lobe covers all terminals (including the unmanned aerial vehicle on the ground); when the unmanned aerial vehicle rises, the main lobe signal strength is reduced, the side lobe signal strength of the adjacent base station is increased, and the main lobe signal strength is possibly exceeded.
Through some external field tests, the inventor finds that as the unmanned aerial vehicles rise, the switching frequency of the unmanned aerial vehicles increases, and the switching failure probability also increases. Therefore, a handover method is needed, which can improve the success rate of handover of terminals including the unmanned aerial vehicle.
Disclosure of Invention
The technical problem to be solved in the embodiments of the present invention is to provide a handover method, a base station, and a computer-readable storage medium, so as to improve a handover success rate of a terminal.
In order to solve the above technical problem, an embodiment of the present invention provides a handover method. The method comprises the following steps:
a serving base station sends a pre-switching request message to a candidate base station, wherein the pre-switching request message is used for indicating the candidate base station to allocate reserved resources for the switching of a terminal, the serving base station is a base station to which a serving cell of the terminal belongs, the candidate base station is a base station to which the candidate cell switched by the terminal belongs, and the reserved resources at least comprise bearing resources;
the serving base station receives a pre-switching confirmation message returned after the candidate base station agrees to allocate reserved resources for the terminal, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal;
when the terminal needs to be switched to a target cell, the serving base station sends a switching indication message to a target base station to which the target cell belongs, and sends a switching command of the target cell for the terminal to the terminal, wherein the target base station is one or more of the candidate base stations.
The embodiment of the invention also provides another switching method, which comprises the following steps:
receiving a pre-switching request message sent by a serving base station by a candidate base station, wherein the pre-switching request message is used for indicating the candidate base station to allocate reserved resources for switching of a terminal, the reserved resources at least comprise bearing resources, the serving base station is a base station to which a serving cell of the terminal belongs, and the candidate base station is a base station to which the candidate cell switched by the terminal belongs;
and the candidate base station executes admission control processing of the terminal, allocates reserved resources for the terminal when the terminal is admitted, and sends a pre-switching confirmation message to the serving base station, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal.
An embodiment of the present invention further provides a serving base station, including: a processor and a transceiver; wherein the content of the first and second substances,
the transceiver is configured to send a pre-handover request message to a candidate base station, where the pre-handover request message is used to instruct the candidate base station to allocate reserved resources for handover of the terminal, where the reserved resources at least include bearer resources; receiving a pre-switching confirmation message returned after the candidate base station agrees to allocate reserved resources for the terminal, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal; when the terminal needs to be switched to a target cell, sending a switching indication message to a target base station to which the target cell belongs, and sending a switching command of the target cell for the terminal to the terminal;
the serving base station is a base station to which a serving cell of the terminal belongs, the candidate base stations are base stations to which candidate cells to which the terminal is switched belong, and the target base station is one or more of the candidate base stations.
The embodiment of the present invention further provides a candidate base station, including:
a transceiver, configured to receive a pre-handover request message sent by a serving base station, where the pre-handover request message is used to instruct a candidate base station to allocate reserved resources for handover of a terminal, where the reserved resources at least include bearer resources, and when the terminal is admitted, allocate the reserved resources for the terminal, and send a pre-handover confirmation message to the serving base station, where the pre-handover confirmation message carries a handover command of the candidate cell for the terminal;
a processor for performing an admission control process of the terminal;
the serving base station is a base station to which a serving cell of the terminal belongs, and the candidate base station is a base station to which a candidate cell to which the terminal is switched belongs.
An embodiment of the present invention further provides a base station, including: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the handover method as described above.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the handover method described above are implemented.
Compared with the prior art, the handover method, the base station and the computer-readable storage medium provided by the embodiment of the invention can enable the candidate base station for handover to be ready for admission control processing in advance before the terminal is formally handed over, establish operations such as relevant access layer configuration for the terminal and the like, and enable the serving base station to obtain the candidate base station which is allowed to admit the terminal, so that the serving base station can select the target base station from the candidate base station which is allowed to admit the terminal during subsequent handover.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of a prior art drone communicating with a base station;
fig. 2 is a flowchart of a handover method according to an embodiment of the present invention;
fig. 3 is another flowchart of a handover method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a serving base station according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a serving base station according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a candidate base station according to an embodiment of the present invention;
fig. 7 is another schematic structural diagram of a candidate base station according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In the prior art, as the height from the ground rises, cells of different base stations begin to overlap, the shape of the cell is changed from an original regular cell to an unshaped cell, the radius of the cell gradually decreases, and the number of the cells gradually increases, so that the switching frequency of the terminal increases, and the probability of switching failure also increases.
In order to avoid frequent disconnection of a terminal (such as an unmanned aerial vehicle), ensure that the terminal can realize timely switching and solve the problem of overlapping between cells of different base stations, the embodiment of the invention provides a switching method, which allows a plurality of base stations to make switching preparation in advance, namely, to complete an admission control step in advance, thereby quickly completing a switching process and improving the switching success rate.
Referring to fig. 2, a handover method provided in an embodiment of the present invention is applied to a serving base station to which a serving cell of a terminal belongs, and the method includes:
Here, the candidate cell may be selected according to an indicator of the received signal strength/quality of the terminal to the cell. For example, a part of neighboring cells, in which the signal reception strength or quality and other indicators meet predetermined conditions, is selected from the terminal neighboring cells, and the part of neighboring cells is used as a candidate cell for handover, and a base station to which the candidate cell belongs is a candidate base station. Specifically, the indicators such as the signal reception strength or the quality may be obtained from the measurement report of the terminal.
The serving base station sends a pre-switching request message to the candidate base station, where the message instructs the candidate base station to allocate reserved resources for the switching of the terminal, for example, after receiving the pre-switching request message, the candidate base station performs admission control processing, and if the candidate base station agrees to access the candidate cell, establishes a corresponding radio bearer for the terminal and allocates required radio resources; or, the candidate base station establishes a radio bearer for the terminal, but does not allocate radio resources; or, the candidate base station only locally maintains the radio bearer configuration information of the terminal, but does not establish a radio bearer and does not allocate radio resources.
After the candidate base station performs the admission control, a handover command of the candidate cell for the terminal may be generated, where the handover command is used to instruct the terminal to handover to the candidate cell, and then the candidate base station sends a pre-handover confirmation message to the serving base station, where the pre-handover confirmation message carries the handover command.
In the embodiment of the present invention, if the candidate cell rejects the terminal access, at this time, the candidate base station may send a pre-handover reject message to the serving base station, where the message indicates that the candidate cell rejects to admit the terminal.
Here, after receiving the pre-handover confirmation message, the serving base station may extract a handover command therein, and locally maintain the handover command of each candidate cell for the terminal.
Here, the serving base station may decide whether or not to switch the serving cell of the terminal according to the relevant criteria. The target cell to be handed over and the target base station to which the target cell belongs may be selected according to a relevant criterion, for example, the target cell and the target base station which satisfy the handover condition are selected according to an index such as received signal quality/strength. Here, the target base station is one of the candidate base stations. Further, to improve the handover success rate, the serving base station may select a target cell from candidate cells that have been locally maintained with a handover command. Then, the serving base station sends a handover command of the target cell for the terminal, which is maintained locally, to the terminal to instruct the terminal to access the target cell, and the serving base station also sends a handover instruction message to the target base station to instruct the target base station and the target cell to formally admit the terminal. The subsequent handover procedure may refer to the implementation of the existing handover procedure, and is not described herein again for saving space.
Through the steps, the embodiment of the invention can make the switched candidate base station ready for admission control processing in advance before the terminal is formally switched, and establish the operations such as relevant access layer configuration and the like for the terminal, and the service base station can obtain the candidate base station which allows the terminal to be admitted, so that the service base station can select the target base station from the candidate base station which allows the terminal to be admitted during the subsequent switching.
In the embodiment of the invention, the serving base station locally maintains the switching command of the candidate cell for the terminal. Specific maintenance modes may include one or more of the following modes:
mode 1: and the candidate base station periodically sends the pre-switching confirmation message to the service base station. And the service base station receives the pre-switching confirmation message periodically sent by the candidate base station and updates the locally maintained switching command of the candidate cell corresponding to the candidate base station for the terminal.
Specifically, the serving base station may carry indication information for indicating an update period of the admission control update when sending the pre-handover request message. And the candidate base station periodically sends a pre-switching confirmation message according to the updating period, and the service base station updates the locally maintained switching command of the candidate cell corresponding to the candidate base station for the terminal according to the pre-switching confirmation message. For example, the serving base station sets and times a timer for each handover command, and resets the timer when receiving a handover command for the terminal from a corresponding candidate cell; and when the timer is overtime and does not receive the switching command of the corresponding candidate cell aiming at the terminal, deleting the switching command of the corresponding candidate cell aiming at the terminal. Here the timeout value of the timer should be greater than or equal to the update period.
Here, the update period may be implemented by using a timer, and the timeout value of the timer is the length of the update period, and when the time expires, the pre-handover confirmation message is sent. Alternatively, the update period may employ a fixed pattern, i.e., the pre-switch acknowledgement message is sent at a fixed time, e.g., at a certain subframe number of each System Frame Number (SFN).
Mode 2: after a candidate base station performs admission control processing of the terminal, accepts the terminal, and sends a pre-handover confirmation message to a serving base station, if the candidate base station needs to reject to accept the terminal for some reason (e.g., an overload), the candidate base station may send a pre-handover rejection message to the serving base station, where the pre-handover rejection message indicates that a candidate cell rejects to accept the terminal. At this time, after receiving the pre-handover rejection message, the serving base station deletes the handover command of the locally maintained corresponding candidate cell for the terminal.
Mode 3: when the candidate cell(s) for terminal handover changes, for example, a certain cell(s) is/are deleted from the candidate cell(s), and a certain cell(s) is/are newly added to the candidate cell(s), at this time, when a candidate cell(s) is/are newly added to the candidate cell(s), the serving base station sends a pre-handover request message to a newly added base station to which the newly added candidate cell(s) belongs, and locally adds a handover command of the newly added candidate cell(s) to the terminal according to a pre-handover confirmation message sent by the newly added base station; for another example, when an existing candidate cell in the candidate cells is deleted, the serving base station deletes a handover command of the locally maintained existing candidate cell for the terminal, and sends a pre-handover update request message to the existing base station to which the existing candidate cell belongs, where the pre-handover update request message instructs the existing candidate cell to delete a handover configuration for the terminal, for example, delete reserved resources. Specifically, according to the different implementations of allocating reserved resources described in the foregoing, the radio bearer established for the terminal and the radio resource allocated to the terminal may be deleted here; or, the radio bearer established for the terminal may be deleted; or, the radio bearer configuration information of the terminal maintained locally may be deleted.
In the embodiment of the invention, the serving base station locally maintains the switching command of the candidate cell for the terminal. When the serving cell of the terminal is switched, the original serving base station before switching may send the locally maintained switching command to the serving base station after switching. Specifically, when the serving base station sends the handover indication message in step 23, the serving base station may send the locally maintained handover command to the serving base station (i.e., the target base station) after the handover procedure of the terminal is completed, and may send the handover command again after the target base station completes the handover procedure of the terminal.
The handover method according to the embodiment of the present invention is described above from the serving base station side. The description will be made from the candidate base station side.
Referring to fig. 3, the handover method provided in the embodiment of the present invention, when applied to a candidate base station side, includes the following steps:
And step 32, the candidate base station executes admission control processing of the terminal, allocates reserved resources to the terminal when the candidate base station agrees to admit the terminal, and sends a pre-switching confirmation message to the serving base station, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal.
Here, when agreeing to admit the terminal, the candidate base station allocates reserved resources to the terminal, specifically, may establish a radio bearer for the terminal and allocate required radio resources; or, the candidate base station establishes a radio bearer for the terminal, but does not allocate radio resources; or, the candidate base station locally maintains the radio bearer configuration information of the terminal, but does not establish a radio bearer and does not allocate radio resources.
Through the steps, the candidate base station of the embodiment of the invention can complete the admission control process of the terminal in advance when the candidate base station allows the terminal to be admitted, so that if the subsequent terminal is switched to the candidate cell of the candidate base station, the switching process can be completed quickly, and the switching success rate is improved.
After the step 31, if the candidate base station does not agree to admit the terminal, the candidate base station may send a pre-handover reject message to the serving base station, where the pre-handover reject message indicates that the candidate cell rejects to admit the terminal.
After the step 32, if the candidate base station is selected by the serving base station as the target base station for terminal handover, the handover method according to the embodiment of the present invention may further include the following steps:
step 33, the candidate base station receives a handover indication message sent by the serving base station, where the handover indication message indicates that the candidate cell formally admits the terminal.
And step 34, the candidate base station performs the access of the terminal according to the switching indication message.
Here, the candidate base station may refer to the existing handover procedure to complete the terminal access, and for saving space, the description is omitted here.
In order to facilitate the serving base station side to maintain the handover commands of the candidate cells for the terminal, after step 32, in the embodiment of the present invention:
1) the candidate base station may periodically send the pre-handover confirmation message to the serving base station. Specific cycle setting modes can be referred to the above description.
2) If the candidate base station needs to reject to admit the terminal, the candidate base station may send a pre-handover reject message to the serving base station, where the pre-handover reject message indicates that the candidate cell rejects to admit the terminal.
3) If the candidate base station receives a pre-switching updating request message sent by a service base station, the pre-switching updating request message indicates to delete the switching configuration aiming at the terminal; at this time, the candidate base station deletes the handover configuration of the candidate cell for the terminal according to the pre-handover update request message.
In the switching process of the prior art, the switching related parameters are usually directly sent to the terminal, and the terminal automatically completes the switching process when certain conditions are met. However, there is a problem that the terminal cannot be accommodated by the network side when performing handover, or pre-handover related parameters may not be applicable (such as allocated resources). The switching method of the embodiment of the invention ensures that the current service base station maintains and updates the pre-switching parameters of the candidate cell/base station for the terminal in real time, and sends the switching command to the terminal when the switching is needed, thereby ensuring the effective control of the network on the switching process and ensuring the switching success rate.
Based on the method, the embodiment of the invention also provides equipment for implementing the method.
Referring to fig. 4, an embodiment of the present invention provides a serving base station, which includes a processor 41 and a transceiver 42; wherein the content of the first and second substances,
the transceiver 42 is configured to send a pre-handover request message to a candidate base station, where the pre-handover request message is used to instruct the candidate base station to allocate reserved resources for handover of the terminal, where the reserved resources at least include bearer resources; receiving a pre-switching confirmation message returned after the candidate base station agrees to allocate reserved resources for the terminal, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal; when the terminal needs to be switched to a target cell, sending a switching indication message to a target base station to which the target cell belongs, and sending a switching command of the target cell for the terminal to the terminal;
the serving base station is a base station to which a serving cell of the terminal belongs, the candidate base stations are base stations to which candidate cells to which the terminal is switched belong, and the target base station is one or more of the candidate base stations.
Preferably, the processor 41 is configured to maintain a handover command for each candidate cell to the terminal; the transceiver 42 is further configured to send a handover command of the locally maintained candidate cell for the terminal to the target base station when the terminal needs to be handed over to the target cell.
Preferably, the processor 41 is further configured to maintain a handover command of the candidate cell to the terminal in at least one of the following manners:
the service base station receives a pre-switching confirmation message periodically sent by a first base station to which a first candidate cell belongs, and updates a switching command of the first candidate cell which is locally maintained for the terminal;
the service base station receives a pre-switching rejection message sent by a second base station to which a second candidate cell belongs, and deletes a switching command of the second candidate cell for the terminal, wherein the second candidate cell is locally maintained, and the pre-switching rejection message indicates that the second candidate cell rejects to admit the terminal;
when a third candidate cell is newly added to the candidate cells, the serving base station sends a pre-switching request message to a third base station to which the third candidate cell belongs, and locally adds a switching command of the third candidate cell for the terminal according to a pre-switching confirmation message sent by the third base station;
when a fourth candidate cell in the candidate cells is deleted, the serving base station deletes a handover command of the locally maintained fourth candidate cell for the terminal, and sends a pre-handover update request message to a fourth base station to which the fourth candidate cell belongs, where the pre-handover update request message indicates that the fourth candidate cell deletes the handover configuration for the terminal.
Referring to fig. 5, another structural diagram of a serving base station is provided in the embodiment of the present invention, including: a processor 501, a transceiver 502, a memory 503, and a bus interface, wherein:
in this embodiment of the present invention, the serving base station 500 further includes: a computer program stored on a memory 503 and executable on a processor 501, the computer program when executed by the processor 501 implementing the steps of: sending a pre-switching request message to a candidate base station, wherein the pre-switching request message is used for indicating the candidate base station to allocate reserved resources for the switching of the terminal, and the reserved resources at least comprise bearing resources; receiving a pre-switching confirmation message returned after the candidate base station agrees to allocate reserved resources for the terminal, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal; when the terminal needs to be switched to a target cell, a switching indication message is sent to a target base station to which the target cell belongs, and a switching command of the target cell for the terminal is sent to the terminal, wherein the target base station is one or more of the candidate base stations. Here, the serving base station is a base station to which a serving cell of the terminal belongs, and the candidate base station is a base station to which a candidate cell to which the terminal is handed over belongs.
In fig. 5, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 501 and various circuits of memory represented by memory 503 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 502 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.
The processor 501 is responsible for managing the bus architecture and general processing, and the memory 503 may store data used by the processor 501 in performing operations.
Optionally, the computer program may further implement the following steps when executed by the processor 503: maintaining a switching command of each candidate cell for the terminal; and when the terminal needs to be switched to a target cell, sending a switching command of a candidate cell which is locally maintained for the terminal to the target base station.
Optionally, the computer program may further implement the following steps when executed by the processor 503:
receiving a pre-switching confirmation message periodically sent by a first base station to which a first candidate cell belongs, and updating a switching command of the first candidate cell which is locally maintained for the terminal;
receiving a pre-switching rejection message sent by a second base station to which a second candidate cell belongs, and deleting a switching command of the second candidate cell locally maintained for the terminal, wherein the pre-switching rejection message indicates that the second candidate cell rejects to admit the terminal;
when a third candidate cell is newly added to the candidate cells, sending a pre-switching request message to a third base station to which the third candidate cell belongs, and locally adding a switching command of the third candidate cell for the terminal according to a pre-switching confirmation message sent by the third base station;
when a fourth candidate cell in the candidate cells is deleted, deleting a locally maintained handover command of the fourth candidate cell for the terminal, and sending a pre-handover update request message to a fourth base station to which the fourth candidate cell belongs, wherein the pre-handover update request message indicates that the fourth candidate cell deletes the handover configuration for the terminal.
Referring to fig. 6, an embodiment of the present invention provides a candidate base station 60, including:
a transceiver 62, configured to receive a pre-handover request message sent by a serving base station, where the pre-handover request message is used to instruct a candidate base station to allocate reserved resources for handover of a terminal, where the reserved resources at least include bearer resources, execute admission control processing on the terminal, allocate reserved resources to the terminal when the terminal is admitted, and send a pre-handover confirmation message to the serving base station, where the pre-handover confirmation message carries a handover command of the candidate cell for the terminal;
a processor 61 for performing an admission control process of the terminal;
the serving base station is a base station to which a serving cell of the terminal belongs, and the candidate base station is a base station to which a candidate cell to which the terminal is switched belongs.
Preferably, the transceiver 62 is further configured to receive a handover indication message sent by the serving base station after sending the pre-handover confirmation message; the processor 61 is further configured to perform access of the terminal according to the handover indication message.
Preferably, the processor 61 is further configured to establish a radio bearer for the terminal and allocate a required radio resource when the terminal agrees to be admitted; or, establishing a radio bearer for the terminal, but not allocating radio resources; or, the radio bearer configuration information of the terminal is maintained locally, but no radio bearer is established and no radio resource is allocated.
Preferably, the transceiver 62 is further configured to send a pre-handover reject message to the serving base station after receiving the pre-handover request message sent by the serving base station, if the candidate base station does not agree to admit the terminal, where the pre-handover reject message indicates that the candidate cell rejects to admit the terminal.
Preferably, the transceiver 62 is further configured to periodically send the pre-handover confirmation message to the serving base station after the candidate base station agrees to admit the terminal.
Preferably, the transceiver 62 is further configured to send a pre-handover reject message to the serving base station after the step of performing the admission control processing of the terminal, if the candidate base station needs to reject to admit the terminal, where the pre-handover reject message indicates that the candidate cell rejects to admit the terminal.
Preferably, the transceiver 62 is further configured to receive a pre-handover update request message sent by a serving base station after sending the pre-handover confirmation message, where the pre-handover update request message indicates to delete the handover configuration for the terminal; the processor 61 is further configured to delete the handover configuration of the candidate cell for the terminal according to the pre-handover update request message.
Referring to fig. 7, another schematic structural diagram of a candidate base station according to an embodiment of the present invention includes: a processor 701, a transceiver 702, a memory 703 and a bus interface, wherein:
in this embodiment of the present invention, the candidate base station 700 further includes: a computer program stored on the memory 703 and executable on the processor 701, the computer program when executed by the processor 701 performing the steps of: receiving a pre-switching request message sent by a service base station, wherein the pre-switching request message is used for indicating a candidate base station to allocate reserved resources for switching of a terminal, and the reserved resources at least comprise bearing resources; and executing admission control processing of the terminal, allocating reserved resources for the terminal when the terminal is admitted, and sending a pre-switching confirmation message to the serving base station, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal. Here, the serving base station is a base station to which a serving cell of the terminal belongs, and the candidate base station is a base station to which a candidate cell to which the terminal is handed over belongs.
In fig. 7, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 701, and various circuits, represented by memory 703, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 702 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.
The processor 701 is responsible for managing the bus architecture and general processing, and the memory 703 may store data used by the processor 701 in performing operations.
Optionally, the computer program may further implement the following steps when executed by the processor 703: after the pre-switching confirmation message is sent, receiving a switching indication message sent by a service base station; and accessing the terminal according to the switching indication message.
Optionally, the computer program may further implement the following steps when executed by the processor 703: establishing a radio bearer for the terminal and allocating required radio resources; or, the candidate base station establishes a radio bearer for the terminal, but does not allocate radio resources; or, the candidate base station locally maintains the radio bearer configuration information of the terminal, but does not establish a radio bearer and does not allocate radio resources.
Optionally, the computer program may further implement the following steps when executed by the processor 703: after receiving a pre-switch request message sent by a service base station, if the candidate base station does not agree to accept the terminal, sending a pre-switch rejection message to the service base station, wherein the pre-switch rejection message indicates that the candidate cell rejects to accept the terminal.
Optionally, the computer program may further implement the following steps when executed by the processor 703: periodically sending the pre-switch confirmation message to the serving base station after the candidate base station agrees to admit the terminal.
Optionally, the computer program may further implement the following steps when executed by the processor 703: after executing the admission control processing of the terminal, if the candidate base station needs to refuse to admit the terminal, sending a pre-switching refusal message to the serving base station, wherein the pre-switching refusal message indicates that the candidate cell refuses to admit the terminal.
Optionally, the computer program may further implement the following steps when executed by the processor 703: receiving a pre-handover update request message sent by a serving base station after sending the pre-handover confirmation message, the pre-handover update request message indicating deletion of a handover configuration for the terminal; and deleting the switching configuration of the candidate cell aiming at the terminal according to the pre-switching updating request message.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
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, 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 of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that substantially contributes 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 steps of the handover method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
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 claims.
Claims (11)
1. A method of handover, comprising:
a serving base station sends a pre-switching request message to a candidate base station, wherein the pre-switching request message is used for indicating the candidate base station to allocate reserved resources for switching of a terminal, the serving base station is a base station to which a serving cell of the terminal belongs, the candidate base station is a base station to which the candidate cell switched by the terminal belongs, and the reserved resources at least comprise bearing resources;
the serving base station receives a pre-switching confirmation message returned after the candidate base station agrees to allocate reserved resources for the terminal, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal;
when the terminal needs to be switched to a target cell, the serving base station sends a switching indication message to a target base station to which the target cell belongs, and sends a switching command of the target cell for the terminal to the terminal, wherein the target base station is one or more of the candidate base stations;
wherein the serving base station maintains a handover command of a candidate cell for the terminal in the following manner:
the service base station receives pre-switching confirmation messages periodically sent by a first base station to which a first candidate cell belongs, updates switching commands of the first candidate cell to the terminal, wherein a timer is set for each switching command and times, and when the switching commands of the corresponding candidate cell to the terminal are received, the timer is reset; when the timer is overtime and does not receive the switching command of the corresponding candidate cell aiming at the terminal, deleting the switching command of the corresponding candidate cell aiming at the terminal;
the service base station receives a pre-switching rejection message sent by a second base station to which a second candidate cell belongs, and deletes a switching command of the second candidate cell for the terminal, wherein the second candidate cell is locally maintained, and the pre-switching rejection message indicates that the second candidate cell rejects to admit the terminal;
when a third candidate cell is newly added to the candidate cells, the serving base station sends a pre-switching request message to a third base station to which the third candidate cell belongs, and locally adds a switching command of the third candidate cell for the terminal according to a pre-switching confirmation message sent by the third base station;
when a fourth candidate cell in the candidate cells is deleted, the serving base station deletes a handover command of the locally maintained fourth candidate cell for the terminal, and sends a pre-handover update request message to a fourth base station to which the fourth candidate cell belongs, where the pre-handover update request message indicates that the fourth candidate cell deletes the handover configuration for the terminal.
2. The method of claim 1, further comprising:
when the terminal needs to be switched to a target cell, the serving base station sends a switching command of a locally maintained candidate cell for the terminal to the target base station.
3. A method of handover, comprising:
receiving a pre-switching request message sent by a serving base station by a candidate base station, wherein the pre-switching request message is used for indicating the candidate base station to allocate reserved resources for switching of a terminal, the serving base station is a base station to which a serving cell of the terminal belongs, the candidate base station is a base station to which the candidate cell switched by the terminal belongs, and the reserved resources at least comprise bearing resources;
the candidate base station executes admission control processing on the terminal, allocates reserved resources for the terminal when the terminal is admitted, and sends a pre-switching confirmation message to the serving base station, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal;
wherein after the candidate base station agrees to admit the terminal, the method further comprises:
the candidate base station periodically sends the pre-switching confirmation message to the serving base station;
after the step of performing admission control processing of the terminal, if the candidate base station needs to reject admission of the terminal, the method further includes: and the candidate base station sends a pre-switching refusing message to the service base station, wherein the pre-switching refusing message indicates that the candidate cell refuses to admit the terminal.
4. The method of claim 3, wherein after sending the pre-switch acknowledgement message, the method further comprises:
the candidate base station receives a switching indication message sent by a service base station;
and the candidate base station performs access of the terminal according to the switching indication message.
5. The method of claim 3, wherein the step of allocating reserved resources for the terminal comprises:
the candidate base station establishes a radio bearer for the terminal and allocates required radio resources; alternatively, the first and second electrodes may be,
the candidate base station establishes a radio bearer for the terminal, but does not allocate radio resources; alternatively, the first and second electrodes may be,
the candidate base station locally maintains the radio bearer configuration information of the terminal, but does not establish radio bearers nor allocate radio resources.
6. The method of claim 3, wherein after the step of receiving the pre-handover request message sent by the serving base station, if the candidate base station does not agree to admit the terminal, the method further comprises:
and the candidate base station sends a pre-switching refusing message to the service base station, wherein the pre-switching refusing message indicates that the candidate cell refuses to admit the terminal.
7. The method of claim 3, wherein after sending the pre-switch acknowledgement message, the method further comprises:
the candidate base station receives a pre-switching updating request message sent by a service base station, wherein the pre-switching updating request message indicates to delete the switching configuration aiming at the terminal;
and the candidate base station deletes the switching configuration of the candidate cell aiming at the terminal according to the pre-switching updating request message.
8. A serving base station, comprising: a processor and a transceiver; wherein the content of the first and second substances,
the transceiver is configured to send a pre-handover request message to a candidate base station, where the pre-handover request message is used to instruct the candidate base station to allocate reserved resources for handover of a terminal, the candidate base station is a base station to which a candidate cell for handover of the terminal belongs, and the reserved resources at least include bearer resources; receiving a pre-switching confirmation message returned after the candidate base station agrees to allocate reserved resources for the terminal, wherein the pre-switching confirmation message carries a switching command of the candidate cell for the terminal; when the terminal needs to be switched to a target cell, sending a switching indication message to a target base station to which the target cell belongs, and sending a switching command of the target cell for the terminal to the terminal;
the serving base station is a base station to which a serving cell of the terminal belongs, and the target base station is one or more of the candidate base stations;
the processor is further configured to maintain a handover command of a candidate cell to the terminal in at least one of the following manners:
receiving pre-switching confirmation messages periodically sent by a first base station to which a first candidate cell belongs, and updating switching commands of the first candidate cell for the terminal, wherein a timer is set for each switching command and is used for timing, and when the switching commands of the corresponding candidate cell for the terminal are received, the timer is reset; when the timer is overtime and does not receive the switching command of the corresponding candidate cell aiming at the terminal, deleting the switching command of the corresponding candidate cell aiming at the terminal;
receiving a pre-switching rejection message sent by a second base station to which a second candidate cell belongs, and deleting a switching command of the second candidate cell locally maintained for the terminal, wherein the pre-switching rejection message indicates that the second candidate cell rejects to admit the terminal;
when a third candidate cell is newly added to the candidate cells, sending a pre-switching request message to a third base station to which the third candidate cell belongs, and locally adding a switching command of the third candidate cell for the terminal according to a pre-switching confirmation message sent by the third base station;
when a fourth candidate cell in the candidate cells is deleted, deleting a locally maintained handover command of the fourth candidate cell for the terminal, and sending a pre-handover update request message to a fourth base station to which the fourth candidate cell belongs, wherein the pre-handover update request message indicates that the fourth candidate cell deletes the handover configuration for the terminal.
9. A candidate base station, comprising:
a transceiver, configured to receive a pre-handover request message sent by a serving base station, where the pre-handover request message is used to instruct a candidate base station to allocate reserved resources for handover of a terminal, where the candidate base station is a base station to which a candidate cell for handover of the terminal belongs, and the reserved resources at least include bearer resources, and when the terminal is agreed to be admitted, allocate reserved resources for the terminal, and send a pre-handover confirmation message to the serving base station, where the pre-handover confirmation message carries a handover command of the candidate cell for the terminal;
a processor for performing an admission control process of the terminal;
the service base station is a base station to which a service cell of the terminal belongs;
wherein the processor is further configured to periodically send the pre-handover confirmation message to the serving base station after granting admission to the terminal; and after the admission control processing of the terminal is executed, if the terminal needs to be refused to be admitted, sending a pre-switching refusing message to the service base station, wherein the pre-switching refusing message indicates that the candidate cell refuses to admit the terminal.
10. A base station, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the handover method according to any of claims 1 to 7.
11. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the handover method according to one of claims 1 to 7.
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| CN111800834B (en) * | 2019-08-13 | 2023-07-07 | 维沃移动通信有限公司 | Cell switching method, device, equipment and medium |
| CN110351801B (en) * | 2019-08-15 | 2021-12-03 | 展讯通信（上海）有限公司 | Cell switching method and device |
| CN111212452B (en) * | 2020-01-13 | 2022-05-17 | 海能达通信股份有限公司 | Handover method for voice communication, communication system, terminal and storage medium |
| CN116390181B (en) * | 2023-06-07 | 2023-09-15 | 武汉世炬信息技术有限公司 | Switching method and system for switching communication cells by user terminal |
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