CN110035451B - Communication switching method and communication switching device - Google Patents

Communication switching method and communication switching device Download PDF

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Publication number
CN110035451B
CN110035451B CN201810033574.7A CN201810033574A CN110035451B CN 110035451 B CN110035451 B CN 110035451B CN 201810033574 A CN201810033574 A CN 201810033574A CN 110035451 B CN110035451 B CN 110035451B
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base station
source base
user equipment
signal quality
handover
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CN201810033574.7A
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CN110035451A (en
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欧阳玉玲
周婷
郦振红
夏欣
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Huizhou TCL Mobile Communication Co Ltd
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Huizhou TCL Mobile Communication Co Ltd
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Priority to CN201810033574.7A priority Critical patent/CN110035451B/en
Priority to PCT/CN2018/080260 priority patent/WO2019136827A1/en
Publication of CN110035451A publication Critical patent/CN110035451A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • 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
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points

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

Abstract

The application discloses a communication switching method, which comprises the following steps: a source base station receives a measurement report reported by user equipment; the source base station judges whether the measurement report meets a pre-switching condition; if so, the source base station sends a pre-switching instruction to the user equipment, wherein the pre-switching instruction is used for indicating the user equipment to establish connection with the target base station and keep the connection with the source base station; the source base station receives a random access success message from the target base station, wherein the random access success message is used for indicating that the user equipment and the target base station are successfully connected; the source base station monitors whether the signal quality of the user equipment side meets the actual switching condition; if the signal quality meets the actual handover condition, the source base station performs the actual handover to complete the handover. The application also discloses a communication switching device. By means of the mode, the method and the device can reduce the interruption time of the switching process.

Description

Communication switching method and communication switching device
Technical Field
The present application relates to the field of communications, and in particular, to a communication switching method and a communication switching apparatus.
Background
Handover (HO) is one of the most basic and important procedures in LTE and NR mobility management. In LTE, mobility management in the Radio Resource Control (RRC) state is controlled by the network, i.e. the network determines the connection relationship between the ue and the cell.
Generally, in the process of network control handover, the ue first disconnects from the source base station and then connects to the target base station. However, after the ue disconnects from the source base station and before the ue establishes a connection with the target base station, there is no connection relationship between the ue and the source base station, and the ue and the target base station, and at this time, uplink/downlink user plane data of the ue cannot be transmitted, which results in a long interruption of the user plane during the handover process.
Disclosure of Invention
The technical problem mainly solved by the present application is to provide a communication switching method and a communication switching apparatus, which can reduce the interruption time of the switching process.
In order to solve the above technical problem, a first aspect of the present application provides a communication handover method, including: a source base station receives a measurement report reported by user equipment; the source base station judges whether the measurement report meets a pre-switching condition; if so, the source base station sends a pre-switching instruction to the user equipment, wherein the pre-switching instruction is used for indicating the user equipment to establish connection with the target base station and keep the connection with the source base station; the source base station receives a random access success message from the target base station, wherein the random access success message is used for indicating that the user equipment and the target base station are successfully connected; the source base station monitors whether the signal quality of the user equipment side meets the actual switching condition; if the signal quality meets the actual handover condition, the source base station performs the actual handover to complete the handover.
In order to solve the above technical problem, a second aspect of the present application provides a communication handover method, including: the user equipment reports a measurement report to a source base station; the user equipment receives a pre-switching instruction from the source base station, wherein the pre-switching instruction is used for indicating the user equipment to establish connection with the target base station and keep the connection with the source base station; the user equipment responds to the pre-switching instruction and establishes connection with the target base station under the condition of keeping connection with the source base station; the user equipment performs or does not perform the actual handover according to the notification from the source base station or the target base station as to whether to perform the actual handover.
In order to solve the above technical problem, a third aspect of the present application provides a communication handover method, including: the target base station receives a pre-switching request from a source base station, wherein the pre-switching request comprises information of user equipment, and the target base station is selected for the user equipment by the source base station according to a measurement report reported by the user equipment; the target base station sends a pre-switching response message to the source base station; the target base station establishes connection with the user equipment; the target base station sends a random access success message to the source base station, wherein the random access success message is used for indicating that the user equipment and the target base station are successfully connected; the target base station performs or does not perform the actual handover according to the notification from the source base station as to whether the actual handover is performed.
In order to solve the above technical problem, a fourth aspect of the present application provides a communication switching apparatus, including a processor and a communication circuit, wherein the processor is connected to the communication circuit; the processor is used for executing instructions to realize the method.
In order to solve the above technical problem, a fifth aspect of the present application provides a communication switching apparatus, which stores instructions that, when executed, implement the above method.
The beneficial effect of this application is: different from the situation of the prior art, in the communication switching method, the source base station sends the pre-switching instruction to the user equipment, the user equipment can be connected with the target base station under the condition that the user equipment can be kept connected with the source base station after responding to the pre-switching instruction, and the actual switching is executed to complete the switching under the condition that the source base station monitors the signal quality of the user equipment side and meets the actual switching condition, the user equipment is disconnected with the source base station in the actual switching process, and the probability that the user equipment completes connection with the target base station is greatly improved, so that the interruption time of the switching process can be reduced.
Drawings
Fig. 1 is a schematic flow chart of a first embodiment of a communication handover method according to the present application;
fig. 2 is a schematic flow chart of a second embodiment of the communication handover method of the present application;
fig. 3 is a schematic flowchart of an actual handover after a source base station receives a random access success message from a target base station according to a second embodiment of the communication handover method of the present application;
fig. 4 is a schematic flowchart of a third embodiment of the communication handover method of the present application;
fig. 5 is a schematic flow chart of a fourth embodiment of the communication handover method of the present application;
fig. 6 is a schematic flowchart of a fifth embodiment of the communication handover method of the present application;
fig. 7 is a flowchart illustrating a sixth embodiment of the communication handover method of the present application;
fig. 8 is a schematic flow chart of a seventh embodiment of the communication handover method of the present application;
fig. 9 is a schematic structural diagram of a first embodiment of the communication switching apparatus of the present application;
fig. 10 is a schematic structural diagram of a second embodiment of the communication switching apparatus of the present application;
fig. 11 is a schematic structural diagram of another embodiment of the second embodiment of the communication switching apparatus of the present application.
Detailed Description
The present application will be described in detail with reference to the drawings and examples. Non-conflicting ones of the following embodiments may be combined with each other.
Referring to fig. 1, fig. 1 is a flowchart illustrating a communication handover method according to a first embodiment of the present application.
An execution main body of the first embodiment of the communication handover method is a base station, and the base station is used as a source base station in a handover process, that is, a base station to which User Equipment (UE) is currently connected. The base station is connected with the core network and performs wireless communication with the user equipment to provide communication coverage for a corresponding geographic area. The base station may be a macro base station, a micro base station, a pico base station, or a home base station (femtocell). In some embodiments, a base station may also be referred to as a radio base station, access point, node B, evolved node B (eNodeB, eNB), gNB, or other suitable terminology. The communication switching method of the embodiment comprises the following steps:
s101: and the source base station receives the measurement report reported by the user equipment.
Before this step, the source base station may send a measurement configuration message to the ue, where the measurement configuration message is used to indicate when the ue starts measurement and reports a measurement report. For example, the measurement configuration message may instruct the ue to report the measurement report at a preset period, or may instruct the ue to report the measurement report under a preset condition, where reporting the measurement report under the preset condition may be that the ue reports the measurement report when the measured signal quality of the source base station is less than a preset threshold.
Optionally, the measurement report may include one or more of a signal quality of a measurement object of the user equipment, a current location of the user equipment, a motion direction, and a load of the target base station, wherein the measurement object may include the source cell and/or the target cell.
Optionally, the reporting of the measurement report may be periodic or aperiodic.
Optionally, reporting the measurement report aperiodically may be that the ue reports the measurement report to the source base station after receiving the measurement configuration message sent by the source base station. The aperiodic reported measurement report may also be a measurement report that is reported by the ue in a self-adaptive period according to the signal quality of the source base station, for example, the ue may establish a list of the signal quality and the reporting period of the source base station, and may report in a lower reporting period when the signal quality of the source base station is higher (better); when the signal quality of the source base station is small (poor), the reporting can be performed in a higher reporting period.
S102: and the source base station judges whether the measurement report meets the pre-switching condition.
Optionally, the pre-handover condition may include at least one of a source cell signal quality at the user equipment side being less than a first threshold, a target cell signal quality at the user equipment side being greater than a second threshold, and a signal quality difference at the user equipment side being greater than a third threshold, where the signal quality difference may be a difference between signal qualities of the target cell and the source cell at the user equipment side, that is, a signal quality of the target cell at the user equipment side minus a signal quality of the source cell.
If the measurement report meets the pre-switching condition, jumping to step S103; if the measurement report does not satisfy the pre-handover condition, the ue may wait for the measurement report to make a decision again, i.e. jump to S101.
S103: and the source base station sends a pre-switching instruction to the user equipment, wherein the pre-switching instruction is used for instructing the user equipment to establish connection with the target base station and maintain the connection with the source base station.
Alternatively, before S103, the source base station may send a pre-handover request to the target base station, and when the source base station receives the pre-handover response message from the target base station as an acknowledgement message, S103 is performed.
Since the signal quality of the measurement object of the user equipment is included in the measurement report, the source base station may select the target base station from the measurement object according to the signal quality in the measurement report. In another embodiment, the source base station may select the target base station by integrating the signal quality of the measurement object, the current location of the user equipment, the motion direction, the load of the measurement object, and other factors in the measurement report.
Optionally, the source base station may select a measurement object with a signal quality greater than a preset threshold as the target base station, or may arrange the measurement objects from large to small according to the signal quality, and take the base station with the best signal quality as the target base station. The measurement object may be a base station geographically close to the source base station, or may be a base station from which the source base station can directly obtain information through an interface between the base stations.
The pre-handover command (RRC connection Reconfiguration) of the present embodiment is used to control the user equipment to establish a connection with the target base station and maintain the connection with the source base station. Alternatively, the pre-handover command configuration parameters may be different from the handover commands in the prior art, and the pre-handover command configuration parameters specific to this embodiment may control the ue to establish a connection with the target base station and maintain the connection with the source base station. In another embodiment, the pre-handover command may be the same as the handover command in the prior art, but the pre-handover command indicates the handover mode in the pre-handover configuration, and the operation performed by the ue when receiving the pre-handover command is different in different handover modes, for example, in an improved handover mode, the ue may establish a connection with the target base station and maintain the connection with the source base station after receiving the pre-handover command.
S104: and the source base station receives a random access success message from the target base station, wherein the random access success message is used for indicating that the user equipment and the target base station are successfully connected.
Although the ue and the target base station are already connected, in order to reduce the load on the interface between the source base station and the target base station, the source base station may temporarily not forward the user plane data to the target base station, and the user plane data packet is not transmitted between the ue and the target base station.
S105: the source base station monitors whether the signal quality of the user equipment side meets the actual switching condition.
Optionally, the signal quality of the source base station on the user equipment side under the actual handover condition may be less than the signal quality of the source base station on the user equipment side under the pre-handover condition, the signal quality of the target base station on the user equipment side under the actual handover condition may be greater than the signal quality of the target base station on the user equipment side under the pre-handover condition, and the signal quality difference on the user equipment side under the actual handover condition may be greater than the signal quality difference on the user equipment side under the pre-handover condition. This means that the pre-handover procedure can be started when the signal quality of the source cell at the user equipment side is better, which reduces Radio Link Failure (RLF) caused by the fact that the user equipment is disconnected from the source cell before the user equipment completes the connection with the target base station. Especially in high frequency/densely deployed cells, radio link failure is very likely to occur.
S106: if the signal quality meets the actual handover condition, the source base station performs the actual handover to complete the handover.
If the source base station receives user data addressed to the user equipment from the core network before the actual handover is completed, the source base station does not transmit the user data to the user equipment but forwards the user data to the target base station.
Alternatively, when the signal quality does not satisfy the actual handover condition, S107 may be performed, i.e., the source base station does not perform the actual handover.
Through the implementation of the embodiment, the source base station sends the pre-switching instruction to the user equipment, the user equipment can be connected with the target base station under the condition that the user equipment can be kept connected with the source base station after responding to the pre-switching instruction, and the actual switching is executed to complete the switching under the condition that the source base station monitors the signal quality of the user equipment side to meet the actual switching condition, the user equipment is disconnected with the source base station again in the actual switching process, and the probability that the user equipment completes the connection with the target base station is greatly improved, so that the interruption time of the switching process can be reduced.
Referring to fig. 2, fig. 2 is a flowchart illustrating a communication handover method according to a second embodiment of the present application. The second embodiment of the communication switching method of the present application is a specific embodiment of the communication switching method. This embodiment is a further extension of the first embodiment of the communication handover method of the present application, and the same parts are not repeated here, and the communication handover method of this embodiment includes the following steps:
s201: and the source base station receives the measurement report reported by the user equipment.
S202: and the source base station judges whether the measurement report meets the pre-switching condition.
In this embodiment, the source base station may determine whether the measurement report satisfies the preset handover condition according to one or more of the signal quality of the measurement object of the ue, the current location of the ue, the moving direction of the ue, and the load of the target base station in the measurement report.
In other embodiments, for example, when the source base station communicates with the ue by using the time division multiplexing technique, the source base station may determine whether the measurement report satisfies the pre-handover condition according to the signal quality obtained from the uplink channel state in the measurement report, where the uplink channel state may be obtained according to the signal quality sent by the base station, the signal quality received by the ue, and the noise at the ue, specifically: the source base station may determine that the measurement report satisfies the predetermined handover condition according to the uplink channel state being less than or equal to a predetermined channel state.
S203: and if the measurement report judged by the source base station meets the pre-switching condition, the source base station selects a target base station for the user equipment according to the measurement report.
In this embodiment, the source base station may select a measurement object with a signal quality greater than a preset threshold as the target base station, or may arrange the measurement objects from large to small according to the signal quality, and take the base station with the best signal quality as the target base station. The measurement object may be a base station geographically close to the source base station, or may be a base station from which the source base station can directly obtain information through an interface between the base stations.
In other embodiments, the source base station may also select a target base station for the user equipment according to the channel status in the measurement report. Alternatively, the method in which the source base station selects the target base station according to the channel state may be similar to the method in which the source base station selects the target base station according to the signal quality.
Optionally, when the source base station determines that the measurement report does not satisfy the preset condition, the method jumps to S201, that is, the source base station continues to receive the measurement report reported by the user equipment.
S204: the source base station sends a pre-handover request to the target base station.
Optionally, information of the user equipment may be included in the pre-handover request.
The information of the UE may include all information required by the target base station to complete a conventional handover, such AS a complete UE context, Radio bearer information, a target cell ID, a base station handover transition Key (eNB/gbb handover transition Key, KeNB/KgNB), an RRC context including a cell Radio Network temporary identity (C-RNTI) of the UE at the source base station, an Access Stratum (AS) configuration, a physical layer ID of the source cell, a short complete Message Authentication Code (MAC-I) for Radio Link Failure (RLF) recovery that may occur, and so on, wherein the complete UE context includes at least a UE X2/Xn signaling context reference (UE X2/Xn signaling context) at the source base station, UE S1/NG signaling context reference (UE S1/NGsignaling context reference), where X2/Xn is the interface between base stations and S1/NG is the interface between a base station and the core network. Optionally, the information of the user equipment may further include one or more combinations of the above information.
Optionally, after the source base station sends the pre-handover request to the target base station, the target base station may perform admission control to determine whether there are enough resources to receive the ue, and if so, may send an Acknowledgement message (ACK) of pre-handover preparation to the source base station, where the ACK message of pre-handover preparation is used to indicate that the admission control is successful. If not, a pre-handover preparation Non-Acknowledgement message (NACK) may be sent to the source base station, the pre-handover preparation Non-Acknowledgement message indicating an admission control failure.
S205: the source base station receives the pre-switching response message from the target base station, and the source base station judges whether the received pre-switching response message is an acknowledgement message.
Alternatively, the pre-handover response message may be acknowledgement information or non-acknowledgement information.
S206: and when the source base station receives the pre-switching response message from the target base station as the confirmation message, the source base station sends a pre-switching instruction to the user equipment, wherein the pre-switching instruction is used for instructing the user equipment to establish connection with the target base station and maintain the connection with the source base station.
Alternatively, after the source base station receives the non-acknowledgement message, it may jump to S207, i.e. another target base station serving the ue may be reselected until a target base station sends a pre-handover ready acknowledgement message to the source base station. Alternatively, the method for the source base station to select another target base station for the user equipment may be that the source base station uses the signal quality or the channel status in the measurement report to select another target base station for the user equipment. The method for selecting another target base station may be similar to the method for selecting the target base station, and is not described herein again.
S208: and the source base station receives a random access success message from the target base station, wherein the random access success message is used for indicating that the user equipment and the target base station are successfully connected.
S209: the source base station monitors whether the signal quality of the user equipment side meets the actual switching condition.
Optionally, the monitoring, by the source base station, whether the signal quality at the user equipment side meets the actual handover condition may include: the source base station may start a handover timer; the source base station can monitor whether the signal quality meets a first condition in the effective period of the switching timer, and if so, the source base station can judge that the signal quality meets the actual switching condition; when the handover timer expires, the source base station may monitor whether the signal quality satisfies a second condition, and if so, determine that the signal quality satisfies the actual handover condition.
It should be understood that if the source base station monitors the signal quality within the validity period of the handover timer and meets the first condition, it may be directly determined that the signal quality at the ue side meets the actual handover condition, and it may not be necessary to determine whether the monitored signal quality meets the second condition. And if the monitored signal quality of the source base station does not meet the first condition within the validity period of the handover timer and the monitored signal quality of the source base station meets the second condition, determining that the signal quality of the user equipment side meets the actual handover condition.
In this embodiment, the initial value of the timer may be 0/validity period, 0 and the validity period may correspond to up-counting and down-counting, respectively, and whether the validity period ends may be determined by determining whether the current value of the timer is greater than or equal to the validity period/less than or equal to 0. For example, when the initial value of the timer is 0 and the validity period is a, the validity period may be determined to be over when the current value of the timer is greater than or equal to a. Similarly, when the initial value of the timer is a valid value, the valid period may be determined to be over when the current value of the timer is less than or equal to 0.
There may be various embodiments for the source base station to monitor whether the signal quality meets the first condition within the validity period of the handover timer, for example, in an embodiment, the source base station may obtain the signal quality according to a measurement report reported by the user equipment within the validity period of the handover timer; the source base station may determine whether the signal quality satisfies a first condition. In another embodiment, the source base station may communicate with the user equipment by using a time division multiplexing technique, and the source base station may estimate an uplink channel state between the user equipment and the source base station according to the received uplink reference signal; because the uplink and downlink frequency bands in the time division multiplexing system are the same, the source base station can obtain the downlink signal quality (namely, the source cell signal quality) of the user equipment side as the signal quality by using the uplink channel state; the source base station may determine whether the signal quality satisfies a first condition.
The source base station monitoring whether the signal quality satisfies the second condition may include: the source base station may receive an updated measurement report from the user equipment; the source base station may determine whether the updated measurement report satisfies the second condition. Alternatively, the source base station may receive the updated measurement report from the user equipment, and the user equipment may send the measurement report to the source base station at a preset period, so that the source base station may receive the measurement report sent by the user equipment at the preset period. Or, the source base station may receive the updated measurement report from the user equipment, where the source base station may send a measurement control message to the user equipment, the user equipment may receive the measurement control message and then obtain the measurement report and send the measurement report to the source base station, and the source base station may receive the measurement report.
Optionally, the first condition may include at least one of the source cell signal quality being less than a fourth threshold, the target cell signal quality being greater than a fifth threshold, and the signal quality difference being greater than a sixth threshold;
optionally, the second condition may include at least one of the source cell signal quality being less than a seventh threshold, the target cell signal quality being greater than an eighth threshold, and the signal quality difference being greater than a ninth threshold.
Optionally, the first threshold may be greater than the fourth threshold, and/or the second threshold may be less than the fifth threshold, and/or the third threshold may be less than the sixth threshold.
Optionally, the seventh threshold may be greater than the fourth threshold, and/or the eighth threshold may be less than the fifth threshold, and/or the ninth threshold may be less than the sixth threshold.
S209: if the signal quality meets the actual handover condition, the source base station performs the actual handover to complete the handover.
Alternatively, the source base station performing the actual handover to complete the handover may include: the source base station may notify the user equipment to disconnect from the source base station, may send a sequence number status transmission message to the target base station, and may forward a user plane packet of the user equipment to the target base station.
Alternatively, the source base station may notify the user equipment of disconnection from the source base station, and the source base station may send a connection end signaling to the user equipment, where the connection end signaling is used to notify the user equipment of disconnection from the source base station.
Alternatively, the source base station may notify the user equipment of the disconnection from the source base station, and the source base station may further transmit a last user plane packet to the user equipment, where the last user plane packet may include a handover identifier, and the handover identifier is used to indicate that an actual handover is started to notify the user equipment of the disconnection from the source base station. Specifically, the source base station sends the user plane data packet to the ue by dividing the user plane data into a plurality of data packets with preset bytes, and sending the data packets to the ue one by one, and the last user plane data packet may be the last data packet sent to the ue by the source base station. Further, the handover identifier in this embodiment may be implicit in the last user plane packet of the user plane data. By hiding the handover identification in the last user plane packet of the user plane data, the signaling overhead between the source base station and the user equipment can be reduced. For example, the header of the last data packet includes a bit identifier for indicating that the data packet includes a handover identifier, the data of the data packet includes a HO indicator with a length of 1bit as a handover identifier, a value of 1 indicates that actual handover is performed, a value of 0 indicates that handover is cancelled, and the other way around, that is, a value of 0 indicates that actual handover is performed, and a value of 1 indicates that handover is cancelled.
Alternatively, if the signal quality does not satisfy the actual handover condition, the source base station does not perform the actual handover.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating an actual handover procedure after a source base station receives a random access success message from a target base station according to a second embodiment of the communication handover method of the present application. The switching method comprises the following steps:
s221: and receiving a random access success message from the target base station.
The random access success message may be used to indicate that the user equipment has successfully established a connection with the target base station.
Optionally, an RACH Successful Indicator with a length of 1bit may be used as an identifier that the target base station and the user equipment are successfully accessed, where a value of 1 indicates Successful access, and a value of 0 indicates failed access, or vice versa.
S222: the source base station starts a handover timer.
Alternatively, the duration of the timer may be determined according to at least one of the signal quality of the source base station, the signal quality of the target base station, the motion state of the user equipment (including the moving speed and the moving direction), and an application scenario in the measurement report, where the application scenario may include the usage state of the user equipment, such as the remaining power of the user equipment, the traffic type of the user equipment, and the noise of the environment around the user equipment.
S223: the source base station monitors the signal quality during the validity period of the handover timer.
S224: the source base station determines whether the signal quality monitored during the validity period satisfies a first condition.
Optionally, when the monitored signal quality satisfies the first condition, the method may jump to S228 to perform the handover procedure; when the monitored signal quality does not satisfy the first condition, it may jump to S225.
S225: it is determined whether the handover timer has expired.
Upon expiration of the handover timer, it may jump to step S226; when the handover timer has not expired, the method may jump to step S223 and the source base station continues to monitor the signal quality.
S226: the source base station monitors whether the signal quality at the mobile terminal side satisfies a second condition.
Alternatively, the step of the source base station monitoring whether the signal quality at the mobile terminal side satisfies the second condition may include: the source base station may send a test control instruction to the user equipment, so that the user equipment may send an updated measurement report to the source base station after receiving the test control instruction, and the source base station may determine whether the signal quality at the user equipment side satisfies the second condition according to the updated measurement report.
In another embodiment, the step of the source base station monitoring whether the signal quality at the mobile terminal side satisfies the second condition may further include: the source base station may receive a measurement report periodically sent by the user equipment, and the source base station may determine whether the signal quality at the user equipment side satisfies the second condition according to the measurement report periodically sent by the user equipment to the source base station.
When the source base station monitors that the signal quality meets the second condition, the method may jump to S228; and when the source base station monitors that the signal quality does not meet the second condition, judging that the signal quality of the source base station does not meet the actual switching condition, and skipping to S227.
S227: and the source base station informs the user equipment and/or the target base station of canceling the handover.
Optionally, after the source base station notifies the user equipment and/or the target base station to cancel the handover, the source base station may continue to receive the measurement report reported by the user equipment, so as to determine and execute the next handover.
S228: the source base station informs the user equipment of disconnecting from the source base station, sends a serial number state transmission message to the target base station, and forwards a user plane data packet of the user equipment to the target base station.
S229: and the source base station releases the resources occupied by the user equipment.
Alternatively, the source base station may complete the handover after the target base station receives a Sequence Number (SN) status transmission message and a user plane data packet of the user equipment, and the user equipment communicates with the target base station.
The SN status transmission message is used to transmit a Packet Data Convergence Protocol (PDCP) sequence number to notify the target base station of a Data transmission status of the source base station.
The user data may be user data received by the source base station from the core network for the user equipment. The user equipment performs the actual handover, the connection with the source base station is disconnected, and the source base station cannot transmit the user data to the user equipment, thereby stopping the ongoing user data transmission and forwarding the user data to the target base station.
Further, the target base station may further send a notification of releasing the context of the user equipment to the source base station, and the source base station may release the resource occupied by the user equipment after receiving the notification of releasing the context of the user equipment.
Referring to fig. 4, fig. 4 is a flowchart illustrating a communication handover method according to a third embodiment of the present application. The execution subject of the third embodiment of the handover method of the present application is a user equipment. The communication switching method of the embodiment comprises the following steps:
s301: and the user equipment reports the measurement report to the source base station.
Before this step, the ue may receive a measurement configuration message sent by the source base station, where the measurement configuration message is used to indicate when the ue starts measurement and reports a measurement report.
Alternatively, the user device may be a mobile phone, a vehicle station, a tablet computer, a smart watch, or the like.
Alternatively, the ue may report the measurement report to the source base station periodically, or may report the measurement report to the source base station non-periodically, for example, event triggered, that is, the ue may report the measurement report to the source base station after receiving the measurement configuration message sent by the source base station.
S302: the user equipment receives a pre-switching instruction from the source base station, wherein the pre-switching instruction is used for instructing the user equipment to establish connection with the target base station and maintain the connection with the source base station.
S303: the user equipment establishes a connection with the target base station while maintaining the connection with the source base station in response to the pre-handover command.
Although the ue and the target base station are already connected, in order to reduce the load on the interface between the source base station and the target base station, the source base station may temporarily not forward the user plane data to the target base station, and the user plane data packet is not transmitted between the ue and the target base station.
Optionally, the ue may also report a measurement report to the source base station periodically, or the ue may report a measurement report to the source base station in response to a measurement control message from the source base station, where the measurement report may be used for the source base station to determine whether to perform handover. The step of the source base station determining whether to perform handover according to the measurement report may refer to the above description.
S304: the user equipment performs or does not perform the actual handover according to the notification from the source base station or the target base station as to whether to perform the actual handover.
Alternatively, the user equipment may perform the actual handover in accordance with a notification from the source base station or the target base station to perform the actual handover. For example, the user disconnects from the source base station after receiving a notification of disconnection from the source base station or the target base station.
Optionally, the user equipment may disconnect the connection with the source base station after receiving a connection end signaling sent by the source base station, where the connection end signaling is used to notify the user equipment of disconnecting the connection with the source base station.
Optionally, the ue may disconnect from the source base station after receiving the last user plane packet sent by the source base station, where the last user plane packet may include a handover identifier, and the handover identifier is used to indicate that an actual handover is started to notify the ue of disconnecting from the source base station.
Although the ue and the target base station are already connected, in order to reduce the load on the interface between the source base station and the target base station, the source base station may temporarily not forward the user plane data to the target base station, and the user plane data packet is not transmitted between the ue and the target base station.
Optionally, the user equipment may further receive a cancel handover notification from the source base station or the target base station, where the cancel handover notification is used to indicate that actual handover is not performed; the user equipment responds to the notification of canceling the switching to disconnect the target base station.
Referring to fig. 5, fig. 5 is a flowchart illustrating a communication handover method according to a fourth embodiment of the present application. The execution subject of the fourth embodiment of the handover method of the present application is the target base station. The communication switching method of the embodiment comprises the following steps:
s401: the target base station receives a pre-handover request from the source base station.
The target base station may be selected by the source base station for the ue according to the measurement report reported by the ue, and the pre-handover request may include information of the ue.
Alternatively, the target base station may be the source base station selected according to the measurement report. For example, the source base station may use the measurement objects with signal quality greater than the preset threshold in the measurement report as the target base station, or may arrange the measurement objects in the measurement report from large to small according to the signal quality and use the base station with the best signal quality as the target base station. The measurement object may be a base station that is geographically close to the source base station, or a base station from which the source base station can directly obtain information through an interface between the base stations.
S402: and the target base station sends a pre-switching response message to the source base station.
And the target base station executes admission control, judges whether enough resources are received by the user equipment, and if so, sends a pre-switching preparation confirmation message to the source base station, wherein the pre-switching preparation confirmation message is used for indicating that the admission control is successful. And if not, sending a pre-switching preparation non-acknowledgement message to the source base station, wherein the pre-switching preparation non-acknowledgement message is used for indicating that the admission control fails.
S403: and the target base station establishes connection with the user equipment.
And the source base station is connected with the user equipment at the same time when the target base station is connected with the user equipment.
S404: and the target base station sends a random access success message to the source base station, wherein the random access success message is used for indicating that the user equipment and the target base station are successfully connected.
S405: the target base station performs or does not perform the actual handover according to the notification from the source base station as to whether the actual handover is performed.
Alternatively, the target base station may perform the actual handover in accordance with the notification from the source base station that the actual handover is performed. Specifically, the method comprises the following steps: the target base station receives the serial number state transmission message from the source base station and forwards a user plane data packet of the user equipment from the source base station to the user equipment; the target base station completes the path switching; and the target base station informs the source base station to release the context of the user equipment.
Alternatively, the target base station may not perform the actual handover according to the notification from the source base station that the actual handover is not performed, specifically: the target base station receives a cancel switching notice from the source base station; the target base station disconnects the connection with the user equipment in response to the cancel handover notification.
Optionally, the target base station may further forward a cancel handover notification to the user equipment, so that the user equipment cancels the connection between the user equipment and the target base station.
It should be appreciated that although the user equipment and the target base station have established a connection before the actual handover is completed, the source base station may temporarily not forward the user plane data to the target base station in order to reduce the load on the interface between the source base station and the target base station.
Referring to fig. 6, fig. 6 is a flowchart illustrating a fifth embodiment of a communication handover method according to the present application.
A fifth embodiment of the communication handover method is a handover method of the communication handover method when the handover timer is not expired, and the same parts as those in the previous embodiments are not described again.
S501: the source base station sends a measurement configuration message to the user equipment.
S502: and the source base station receives the measurement report reported by the user equipment.
S503: and the source base station decides to start pre-switching and determines a target base station for the user equipment according to the measurement report.
S504: the source base station sends a pre-handover request to the target base station.
S505: the target base station transmits a pre-handover preparation confirmation message to the source base station.
After the target base station successfully performs admission control, pre-handover preparation is performed at L1/L2, and an Acknowledgement message (ACK) of the pre-handover preparation is sent to the source base station after allocating resources for the user equipment. The information of the resource allocated by the target base station for the user equipment, such as the new C-RNTI allocated for the user equipment, the dedicated random access sequence, etc., may be included in the pre-handover prepared acknowledgement message as part of the information of the target base station, or may be independently sent to the source base station and sent to the user equipment by the source base station.
S506: and the source base station sends a pre-switching instruction to the user equipment.
S507: the user equipment starts random access to establish connection with the target base station.
It should be noted that in this embodiment, the user equipment establishes a connection with the target base station and maintains a connection with the source base station.
S508: and the target base station sends a message that the target base station is successfully connected with the user equipment to the source base station.
S509: and the source base station starts a switching timer after receiving the message which is sent by the target base station and is successfully connected with the user equipment.
S510: the source base station monitors that the signal quality meets a first condition within the validity period of the handover timer.
S511: the source base station sends a sequence number status transmission message to the target base station.
Optionally, the source base station does not forward the user plane packet to the target base station before performing the actual handover, i.e. the source base station does not forward the user plane packet to the target base station before S451. By the method, not only can the Radio Link Failure (RLF) between the source base station and the user equipment be avoided, but also the signaling overhead between the source base station and the target base station can be reduced.
It should be understood that, before S511, the user equipment only performs transmission of user plane data with the source base station.
S512: and the source base station forwards the user plane data packet of the user equipment to the target base station.
S513: and the source base station informs the user equipment of disconnecting from the source base station.
In this embodiment, the sequence of S511, S512, and S513 is not limited, for example, the source base station may further notify the ue to disconnect from the source base station first, and then the source base station sends the serial number state transmission message to the target base station, and forwards the user plane data packet of the ue to the target base station, or the source base station may also notify the ue to disconnect from the source base station simultaneously, and send the serial number state transmission message to the target base station, and forwards the user plane data packet of the ue to the target base station.
And after the user equipment is switched, the user equipment and the target base station perform user plane data transmission.
S514: and the target base station informs the source base station to release the context of the user equipment.
S515: and after receiving the context information for releasing the user equipment, the source base station releases the user equipment resources.
Referring to fig. 7, fig. 7 is a flowchart illustrating a communication handover method according to a sixth embodiment of the present application.
A sixth embodiment of the communication handover method of the present application is a method for a ue not to perform handover when a handover timer expires, wherein details of the same parts as those in the foregoing embodiments are omitted. The communication switching method of the embodiment comprises the following steps:
s601: the source base station sends a measurement configuration message to the user equipment.
S602: and the source base station receives the measurement report reported by the user equipment.
S603: and the source base station decides to start pre-switching and determines a target base station for the user equipment according to the measurement report.
S604: the source base station sends a pre-handover request to the target base station.
S605: the target base station transmits a pre-handover preparation confirmation message to the source base station.
S606: and the source base station sends a pre-switching instruction to the user equipment.
S607: the user equipment starts random access to establish connection with the target base station.
S608: and the target base station sends a message that the target base station is successfully connected with the user equipment to the source base station.
S609: and the source base station starts a switching timer after receiving the message which is sent by the target base station and is successfully connected with the user equipment.
S610: the source base station monitors that the signal quality does not satisfy the first condition during the validity period of the handover timer.
S611: the source base station transmits a measurement control message to the user equipment.
The measurement control signaling may be the same as or different from the measurement configuration information in step S601. The measurement control message is used for controlling the user equipment so that the user equipment sends the updated measurement report to the source base station. Optionally, the measurement control message may be used to control the ue to send one updated measurement report, or may also control the ue to send multiple updated measurement reports at different time points, which is not limited herein.
S612: after receiving the measurement control message sent by the source base station, the user equipment sends an updated measurement report to the source base station.
Optionally, the updated measurement report is formed by at least one of the signal quality of the source base station where the ue is located, the signal quality of the target base station, the motion state (including the moving speed and the moving direction) of the ue, and an application scenario, where the ue acquires the measurement control message sent by the source base station after receiving the measurement control message.
S613: and the source base station determines not to execute the switching according to the received updated measurement report.
S614: and the source base station informs the target base station of the information of canceling the switching.
In other embodiments, the source base station may inform the user equipment of the information to cancel the handover. Or the source base station can simultaneously inform the user equipment and the target base station of the information of canceling the handover.
In this embodiment, a Cancel Handover Indicator with a length of 1bit may be used as an identifier for canceling Handover between the user equipment and the target base station, where a value of 1 indicates that Handover is canceled, and a value of 0 indicates that Handover is not canceled, or vice versa.
S615: and after receiving the information of canceling the switching, the target base station disconnects the connection with the user equipment. And release the user equipment resources.
In other embodiments, the source base station may notify the user equipment of the information of canceling the handover so that the user equipment may disconnect from the target base station.
Referring to fig. 8, fig. 8 is a flowchart illustrating a communication handover method according to a seventh embodiment of the present application.
A seventh embodiment of the communication handover method of the present application is a method for a ue to perform handover when a handover timer expires, wherein parts identical to those in the foregoing embodiments are not described again. The communication switching method of the embodiment comprises the following steps:
s701: the source base station sends a measurement configuration message to the user equipment.
S702: and the source base station receives the measurement report reported by the user equipment.
S703: and the source base station decides to start pre-switching and determines a target base station for the user equipment according to the measurement report.
S704: the source base station sends a pre-handover request to the target base station.
S705: the target base station transmits a pre-handover preparation confirmation message to the source base station.
S706: and the source base station sends a pre-switching instruction to the user equipment.
S707: the user equipment starts random access to establish connection with the target base station.
S708: and the target base station sends a message that the target base station is successfully connected with the user equipment to the source base station.
S709: and the source base station starts a switching timer after receiving the message which is sent by the target base station and is successfully connected with the user equipment.
S710: the source base station monitors that the signal quality does not satisfy the first condition during the validity period of the handover timer.
S711: the source base station transmits a measurement control message to the user equipment.
S712: after receiving the measurement control message sent by the source base station, the user equipment sends an updated measurement report to the source base station.
S713: the source base station decides to perform handover according to the received updated measurement report.
S714: the source base station sends a sequence number status transmission message to the target base station.
S715: and the source base station forwards the user plane data packet of the user equipment to the target base station.
S716: and the source base station informs the user equipment of disconnecting from the source base station.
It should be noted that the order of S714, S715, and S716 is not limited in this embodiment.
S717: and the target base station informs the source base station to release the context of the user equipment.
S718: and after receiving the context information for releasing the user equipment, the source base station releases the user equipment resources.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a communication switching apparatus according to a first embodiment of the present application.
In the present embodiment, the communication switching apparatus 10 includes a processor 11 and a communication circuit 12, and the processor 11 is connected to the communication circuit 12.
The processor is configured to execute the instructions to implement the communication switching method of any of the above embodiments.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a second embodiment of the communication switching apparatus of the present application.
In the present embodiment, the communication switching apparatus 20 stores instructions that can be executed to implement the communication switching method of any one of the above-described embodiments.
Referring to fig. 11, fig. 11 is a schematic structural diagram of another embodiment of a communication switching apparatus according to the present application. Alternatively, in another embodiment, the communication switching device 30 may include a storage device 31, and the storage device 31 may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or a server, which may store various program codes. The communication switching device 30 may be the same as the communication switching device 20 described above.
Different from the situation of the prior art, in the communication switching method, the source base station sends the pre-switching instruction to the user equipment, the user equipment can be connected with the target base station under the condition that the user equipment can be kept connected with the source base station after responding to the pre-switching instruction, and the actual switching is executed to complete the switching under the condition that the source base station monitors the signal quality of the user equipment side and meets the actual switching condition, the user equipment is disconnected with the source base station in the actual switching process, and the probability that the user equipment completes connection with the target base station is greatly improved, so that the interruption time of the switching process can be reduced.
The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, and all modifications, equivalents, and equivalent structures or equivalent processes that can be used directly or indirectly in other related fields of technology shall be encompassed by the present invention.

Claims (25)

1. A method of communication handover, comprising:
a source base station receives a measurement report reported by user equipment, wherein the measurement report comprises: signal quality of a measurement object of a user equipment, the measurement object comprising a source cell and/or a target cell;
the source base station judges whether the measurement report meets a pre-switching condition, wherein the pre-switching condition comprises at least one of a source cell signal quality of the user equipment side being smaller than a first threshold value, a target cell signal quality of the user equipment side being larger than a second threshold value, and a signal quality difference of the user equipment side being larger than a third threshold value, and the signal quality difference is a signal quality difference between the target cell and the source cell of the user equipment side;
if so, the source base station sends a pre-switching instruction to the user equipment, wherein the pre-switching instruction is used for indicating the user equipment to establish connection with a target base station and maintain the connection with the source base station;
the source base station receives a random access success message from the target base station, wherein the random access success message is used for indicating that the user equipment and the target base station are successfully connected;
the source base station monitors whether the signal quality of the user equipment side meets an actual switching condition, wherein the actual switching condition comprises: the source base station starts a switching timer; the source base station monitors whether the signal quality meets a first condition within the validity period of the switching timer, and if so, the source base station judges that the signal quality meets an actual switching condition; when the switching timer expires, the source base station monitors whether the signal quality meets a second condition, and if so, the source base station judges that the signal quality meets an actual switching condition;
and if the signal quality meets the actual switching condition, the source base station executes actual switching to complete the switching.
2. The method of claim 1,
before the source base station sends the pre-switching instruction to the user equipment, the method further comprises:
the source base station selects a target base station for the user equipment according to the measurement report;
the source base station sends a pre-switching request to the target base station;
the source base station receives a pre-handover response message from the target base station.
3. The method of claim 1,
the source base station monitoring whether the signal quality satisfies a first condition within the validity period of the handover timer includes:
the source base station acquires the signal quality according to a measurement report reported by the user equipment within the validity period of the switching timer;
the source base station determines whether the signal quality satisfies the first condition.
4. The method of claim 1,
the source base station communicates with the user equipment by adopting a time division multiplexing technology, and the source base station monitoring whether the signal quality meets a first condition within the validity period of the handover timer comprises:
the source base station estimates the uplink channel state of the user equipment;
the source base station acquires the signal quality by using the uplink channel state;
the source base station determines whether the signal quality satisfies the first condition.
5. The method of claim 1,
the source base station monitoring whether the signal quality satisfies a second condition comprises:
the source base station receives an updated measurement report from the user equipment;
the source base station determines whether the updated measurement report satisfies the second condition.
6. The method of claim 5,
before the source base station receives the updated measurement report from the user equipment, the method further comprises:
and the source base station sends a measurement control message to the user equipment.
7. The method of claim 1,
the first condition comprises at least one of the source cell signal quality being less than a fourth threshold, the target cell signal quality being greater than a fifth threshold, and the signal quality difference being greater than a sixth threshold;
the second condition includes at least one of the source cell signal quality being less than a seventh threshold, the target cell signal quality being greater than an eighth threshold, and the signal quality difference being greater than a ninth threshold.
8. The method of claim 7,
the first threshold is greater than the fourth threshold, the second threshold is less than the fifth threshold, and/or the third threshold is less than the sixth threshold.
9. The method of claim 7,
the seventh threshold is greater than the fourth threshold, the eighth threshold is less than the fifth threshold, and/or the ninth threshold is less than the sixth threshold.
10. The method according to any one of claims 1 to 9,
the source base station performing an actual handover to complete the handover comprises:
and the source base station informs the user equipment of disconnecting from the source base station, sends a serial number state transmission message to the target base station and forwards a user plane data packet of the user equipment to the target base station.
11. The method of claim 10,
the informing, by the source base station, that the user equipment is disconnected from the source base station includes:
the source base station sends a connection ending signaling to the user equipment, wherein the connection ending signaling is used for informing the user equipment of disconnecting from the source base station; or
And the source base station sends a last user plane data packet to the user equipment, wherein the last user plane data packet comprises a switching identifier, and the switching identifier is used for indicating that actual switching is started so as to inform the user equipment of disconnecting from the source base station.
12. The method of claim 10,
the source base station does not forward the user plane packet to the target base station prior to performing the actual handover.
13. The method as claimed in any of claims 1-9, wherein the source base station further monitors whether the signal quality of the user equipment side satisfies an actual handover condition, and then:
and if the signal quality does not meet the actual switching condition, the source base station informs the user equipment and/or the target base station of canceling the switching.
14. A method of communication handover, comprising:
the method comprises the following steps that user equipment reports a measurement report to a source base station, wherein the measurement report comprises: signal quality of a measurement object of a user equipment, the measurement object comprising a source cell and/or a target cell;
the user equipment receives a pre-switching instruction from the source base station, wherein the pre-switching instruction is used for instructing the user equipment to establish connection with a target base station and maintain the connection with the source base station; the pre-handover command is a command that the source base station sends to the ue after the measurement report meets a pre-handover condition, where the pre-handover condition includes at least one of a source cell signal quality at the ue side being less than a first threshold, a target cell signal quality at the ue side being greater than a second threshold, and a signal quality difference at the ue side being greater than a third threshold, and the signal quality difference is a difference between signal qualities of the target cell and the source cell at the ue side;
the user equipment responds to the pre-switching instruction and establishes connection with the target base station under the condition of keeping connection with the source base station;
the user equipment performs or does not perform the actual handover according to a notification from the source base station or the target base station as to whether to perform the actual handover, where the actual handover is performed when an actual handover condition is satisfied, where the actual handover condition includes: the source base station starts a switching timer; the source base station monitors whether the signal quality of the user equipment side meets a first condition within the validity period of the switching timer, and if so, the source base station judges that the signal quality meets the actual switching condition; when the handover timer expires, the source base station monitors whether the signal quality meets a second condition, and if so, determines that the signal quality meets an actual handover condition.
15. The method of claim 14, wherein the user equipment performing or not performing the actual handover according to the notification from the source base station or the target base station as to whether to perform the actual handover comprises:
the user equipment receives a disconnection notification from the source base station, wherein the disconnection notification is used for indicating that the actual switching is executed;
the user equipment responds to the disconnection notice to disconnect the source base station.
16. The method of claim 15,
the receiving, by the user equipment, the disconnection notification from the source base station includes:
the user equipment receives a connection ending signaling from the source base station; or
And the user equipment receives the last user plane data packet from the source base station, wherein the last user plane data packet comprises a switching identifier, and the switching identifier is used for indicating that actual switching is started to inform the user equipment of disconnecting from the source base station.
17. The method of claim 15,
receiving, by the user equipment, a user plane packet from the source base station before receiving the disconnection notification from the source base station.
18. The method of claim 14, wherein the user equipment performing or not performing the actual handover according to the notification from the source base station or the target base station as to whether to perform the actual handover comprises:
the user equipment receives a cancel switching notification from the source base station or the target base station, wherein the cancel switching notification is used for indicating that the actual switching is not executed;
and the user equipment responds to the cancel switching notification to disconnect the target base station.
19. The method according to any of claims 14-18, wherein the user equipment further comprises after establishing the connection with the target base station while maintaining the connection with the source base station in response to the pre-handover command:
the user equipment reports a measurement report to the source base station periodically or in response to a measurement control message from the source base station, wherein the measurement report is used for the source base station to judge whether to perform handover.
20. A method of communication handover, comprising:
a target base station receives a pre-switching request from a source base station, wherein the pre-switching request includes information of user equipment, and the target base station is selected by the source base station for the user equipment according to a measurement report reported by the user equipment, and the measurement report includes: signal quality of a measurement object of a user equipment, the measurement object comprising a source cell and/or a target cell;
the target base station sends a pre-handover response message to the source base station, where the sending of the pre-handover response message meets a pre-handover condition, where the pre-handover condition includes at least one of a source cell signal quality at the user equipment side being less than a first threshold, a target cell signal quality at the user equipment side being greater than a second threshold, and a signal quality difference at the user equipment side being greater than a third threshold, and the signal quality difference is a difference between signal qualities of the target cell and the source cell at the user equipment side;
the target base station establishes connection with the user equipment;
the target base station sends a random access success message to the source base station, wherein the random access success message is used for indicating that the user equipment and the target base station are successfully connected;
the target base station performs or does not perform the actual handover according to a notification from the source base station as to whether to perform the actual handover, the actual handover being performed when an actual handover condition is satisfied, wherein the actual handover condition includes: the source base station starts a switching timer; the source base station monitors whether the signal quality of the user equipment side meets a first condition within the validity period of the switching timer, and if so, the source base station judges that the signal quality meets the actual switching condition; when the handover timer expires, the source base station monitors whether the signal quality meets a second condition, and if so, determines that the signal quality meets an actual handover condition.
21. The method of claim 20,
the target base station performing or not performing the actual handover according to the notification from the source base station as to whether to perform the actual handover includes:
the target base station receives a serial number state transmission message from the source base station and forwards a user plane data packet of the user equipment from the source base station to the user equipment;
the target base station completes path switching;
and the target base station informs the source base station to release the context of the user equipment.
22. The method of claim 20,
the target base station performing or not performing the actual handover according to the notification from the source base station as to whether to perform the actual handover includes:
the target base station receives a cancel switching notice from the source base station;
and the target base station responds to the cancel switching notification to disconnect the user equipment.
23. The method of claim 22, further comprising:
and the target base station forwards the notification of canceling the switching to the user equipment.
24. A communication switching apparatus, comprising a processor and a communication circuit, wherein the processor is connected to the communication circuit;
the processor is configured to execute instructions to implement the method of any one of claims 1-23.
25. A communication switching apparatus having stored instructions which, when executed, implement the method of any one of claims 1 to 23.
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