CN106900015B - Method and device for processing reestablishment in cross-base-station switching process - Google Patents

Method and device for processing reestablishment in cross-base-station switching process Download PDF

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Publication number
CN106900015B
CN106900015B CN201510956416.5A CN201510956416A CN106900015B CN 106900015 B CN106900015 B CN 106900015B CN 201510956416 A CN201510956416 A CN 201510956416A CN 106900015 B CN106900015 B CN 106900015B
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base station
handover
rrc connection
message
target base
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CN106900015A (en
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邹俊
赵毅
杨敏
陈洪昌
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2016/097238 priority patent/WO2017101511A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Abstract

The invention provides a method and a device for processing reestablishment in a cross-base-station switching process. Wherein, the method comprises the following steps: when a target base station receives a Radio Resource Control (RRC) connection reestablishment request of User Equipment (UE) in a handover preparation stage, the target base station suspends a handover preparation process and executes an RRC connection reestablishment process; when the target base station receives an RRC connection reestablishment completion message of the UE, the target base station activates a handover preparation process, sends an RRC connection reconfiguration message to the UE, and sends a handover confirmation message carrying an expansion cause value to a Mobility Management Entity (MME) or a source base station. The invention provides a processing strategy for a target base station to receive an RRC connection reestablishment request in a cross-base station switching preparation stage in the related technology, reduces the incidence of UE call drop caused by RRC connection reestablishment failure in the switching preparation process, and improves the switching stability and the user experience.

Description

Method and device for processing reestablishment in cross-base-station switching process
Technical Field
The invention relates to the field of communication, in particular to a method and a device for processing reestablishment in a cross-base-station switching process.
Background
In a Long Term Evolution (LTE) system, a User Equipment (UE) state is divided into a CONNECTED state (RRC _ CONNECTED) and an IDLE state (RRC _ IDLE). When a UE in RRC _ CONNECTED state moves from a serving cell to another cell, HandOver (HandOver) is triggered to ensure uninterrupted service. When a UE is handed over from a cell of one Evolved Node B (eNB), i.e. LTE base station, to a cell of another eNB, a handover across base stations is triggered. If there is an X2Interface (X2Interface) between the Handover source base station and the Handover target base station and the Handover source base station is connected to the same Mobility Management Entity (MME), according to the prior art (3rd Generation Partnership Project, 3GPP protocol, 23.401 protocol), the source eNB will initiate Handover (X2Interface Handover) via an X2Interface, otherwise, Handover (S1Interface Handover) via an S1Interface will be initiated. For both types of handover, there are two phases of preparation and execution, depending on the different phases in which the handover occurs. The preparation phase comprises the following steps:
first, the eNB at the source side of the Handover sends a Handover Request (Handover Request)
And secondly, the eNB at the switching target side replies a switching Request acknowledgement (Handover Request Ack) message carrying a Radio Resource Control (RRC) reconfiguration message for configuring the UE after the admission of the Radio resources and the service bearer are established according to the received switching Request, and enters a switching execution stage.
And thirdly, after entering a handover execution phase, the handover source side eNB configures the UE according to the RRC connection reconfiguration message generated by the handover target side eNB, and then the UE is accessed to the target base station to complete handover.
In the S1/X2 handover preparation phase, due to air interface quality reasons such as Radio Link Failure (RLF), the UE in the RRC connected state that is activated safely is re-established to the handover target base station. For the handover target base station, the context information of the UE is included, and the Access Stratum (AS for short) is already activated safely, and according to the 36.331 protocol, the present reestablishment meets the condition of successful reestablishment.
When a handover target base station receives an RRC connection reestablishment request message in a handover preparation phase, according to the prior art, the following two assumed processing schemes are proposed:
assume one: the handover target base station replies a handover preparation failure message to the handover source base station, which inevitably causes the handover source base station to re-initiate the next handover to other base stations or cells or release the UE, and actually the UE has lost the RRC connection with the handover source base station; thus, the switching target side base station can only refuse the RRC connection reestablishment.
Assume two: the handover target base station replies a handover confirmation message to the handover source base station, and actually the UE has lost the RRC connection with the handover source base station, and the handover source base station still issues an RRC connection reconfiguration message of the handover command to the UE, which results in a waste of radio resources of the handover source base station.
Therefore, no matter which assumption processing scheme is adopted, the problem that the UE call drop is caused by the reestablishment failure in the scenario that the handover target base station receives the reestablishment request in the handover preparation stage cannot be reasonably and effectively solved.
Disclosure of Invention
The invention provides a method and a device for processing reestablishment in a cross-base-station switching process, which are used for at least solving the problem that UE call drop is caused by reestablishment failure in the scene that a target base station receives an RRC connection reestablishment request in a cross-base-station switching preparation stage in the related technology.
According to an aspect of the present invention, a method for processing reestablishment in a cross-base-station handover process is provided, including: when a target base station receives an RRC connection reestablishment request of UE in a handover preparation stage, the target base station suspends a handover preparation process and executes an RRC connection reestablishment process; and when the target base station receives the RRC connection reestablishment completion message of the UE, the target base station activates the switching preparation process, sends an RRC connection reconfiguration message to the UE, and sends a switching confirmation message carrying the expansion reason value to an MME or a source base station.
Optionally, the sending, by the target base station, the handover confirmation message carrying the extension cause value includes: and under the condition that the handover type is S1 handover, the target base station sends the handover confirmation message carrying the extended cause value to the MME, wherein the extended cause value is used for instructing the MME to send a handover command carrying the extended cause value to the source base station and instructing the source base station not to send an RRC connection reconfiguration message to the UE.
Optionally, the sending, by the target base station, the handover confirmation message carrying the extension cause value includes: and under the condition that the handover type is X2 handover, the target base station sends a handover confirmation message carrying the extended reason value to the source base station, wherein the extended reason value is used for indicating that the source base station does not send an RRC connection reconfiguration message to the UE.
Optionally, after the target base station sends the RRC connection reconfiguration message to the UE, the method further includes: starting an RRC connection reconfiguration completion timer; and when the RRC connection reconfiguration complete message is received before the RRC connection reconfiguration complete timer is overtime, the target base station confirms that the UE successfully completes the switching.
Optionally, after the target base station confirms that the UE successfully completes handover, the method further includes: the target base station sends a path conversion request message or a switching notification message to the MME, wherein the path conversion request message or the switching notification message is used for indicating that the UE has successfully completed switching.
Optionally, in a case that the RRC connection reconfiguration complete timer expires and the RRC connection reconfiguration complete message is not received, the method further includes: and the target base station executes the RRC connection resource release process of the UE.
Optionally, after the target base station suspends the handover preparation procedure, the method further includes: under the condition that the switching type is S1 switching and the target base station does not receive the RRC connection reestablishment completion message of the UE, the target base station receives a UE context release command sent by the MME; and the target base station sends an RRC connection reestablishment rejection message to the UE according to the UE context release command and sends a UE context release completion message to the MME.
Optionally, after the target base station suspends the handover preparation procedure, the method further includes: under the condition that the switching type is X2 switching and the target base station does not receive the RRC connection reestablishment completion message of the UE, the target base station receives a switching cancellation message sent by a source base station; and the target base station sends an RRC connection reestablishment rejection message to the UE according to the switching cancellation message.
According to another aspect of the present invention, there is also provided a processing apparatus for reestablishing in a handover procedure across base stations, which is applied to a base station, and includes: a first processing module, configured to suspend a handover preparation procedure and execute an RRC connection reestablishment procedure when the base station receives an RRC connection reestablishment request of the UE in a handover preparation phase as a target base station; and the second processing module is used for activating the switching preparation process, sending an RRC connection reconfiguration message to the UE and sending a switching confirmation message carrying the expansion reason value to an MME or a source base station when the RRC connection reestablishment completion message of the UE is received.
Optionally, the second processing module is configured to: and sending a handover confirmation message carrying the extended reason value to the MME under the condition that the handover type is S1 handover, wherein the extended reason value is used for indicating the MME to send a handover command carrying the extended reason value to the source base station and indicating the source base station not to send an RRC connection reconfiguration message to the UE.
Optionally, the second processing module is configured to: and sending a handover confirmation message carrying the extended reason value to the source base station under the condition that the handover type is X2 handover, wherein the extended reason value is used for indicating that the source base station does not send an RRC connection reconfiguration message to the UE.
Optionally, the apparatus further comprises: the starting module is used for starting an RRC connection reconfiguration completion timer; a confirming module, configured to confirm that the UE successfully completes handover when the RRC connection reconfiguration complete message is received before the RRC connection reconfiguration complete timer expires.
Optionally, the apparatus further comprises: a first sending module, configured to send a path conversion request message or a handover notification message to the MME, where the path conversion request message or the handover notification message is used to indicate that the UE has successfully completed handover.
Optionally, the apparatus further comprises: and the execution module is used for executing the RRC connection resource release process of the UE under the condition that the RRC connection reconfiguration completion timer is overtime and the RRC connection reconfiguration completion message is not received.
Optionally, the apparatus further comprises: a first receiving module, configured to receive a UE context release command sent by the MME when a handover type is S1 handover and the RRC connection reestablishment complete message of the UE is not received; a second sending module, configured to send an RRC connection reestablishment reject message to the UE according to the UE context release command, and send a UE context release complete message to the MME.
Optionally, the apparatus further comprises: a second receiving module, configured to receive a handover cancel message sent by a source base station when a handover type is X2 handover and the RRC connection reestablishment complete message of the UE is not received; a third sending module, configured to send an RRC connection reestablishment reject message to the UE according to the handover cancel message.
According to the invention, when the target base station receives the RRC connection reestablishment request of the UE in the switching preparation stage, the target base station suspends the switching preparation process and executes the RRC connection reestablishment process; when the target base station receives the RRC connection reestablishment completion message of the UE, the target base station activates the switching preparation process, sends an RRC connection reconfiguration message to the UE, and sends a switching confirmation message carrying an extended cause value, so that the problem of UE call drop caused by reestablishment failure in a situation that the target base station receives an RRC connection reestablishment request in a cross-base station switching preparation stage in the related technology is solved, and the switching stability and the user experience are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a processing method for reestablishment in a handover procedure across base stations according to an embodiment of the present invention;
fig. 2 is a block diagram of a processing apparatus for re-establishment during a cross-base station handover process according to an embodiment of the present invention;
fig. 3 is a block diagram of an alternative structure of a processing device reestablished in a cross-base station handover process according to an embodiment of the present invention;
fig. 4 is a block diagram of an alternative structure of a processing apparatus reestablished during a handover procedure across base stations according to an embodiment of the present invention;
fig. 5 is a block diagram of an alternative structure of a processing apparatus reestablished during a handover procedure across base stations according to an embodiment of the present invention;
fig. 6 is a block diagram of an alternative structure of a processing apparatus reestablished during a handover procedure across base stations according to an embodiment of the present invention;
fig. 7 is a block diagram of an alternative structure of a processing apparatus reestablished during a handover procedure across base stations according to an embodiment of the present invention;
fig. 8 is a flowchart of a processing method for reestablishment in a handover procedure across base stations according to an alternative embodiment of the present invention;
fig. 9 is a flowchart of a processing method for reestablishment during a handover procedure between base stations according to a second alternative embodiment of the present invention;
fig. 10 is a flowchart of a processing method for reestablishment during a handover procedure between base stations according to a third alternative embodiment of the present invention;
fig. 11 is a flowchart of a processing method for reestablishment during a handover procedure between base stations according to a fourth alternative embodiment of the present invention;
fig. 12 is a flowchart of a processing method for reestablishment during a handover procedure between base stations according to a fifth alternative embodiment of the present invention;
fig. 13 is a flowchart of a cross base station handover cancellation method according to an alternative sixth embodiment of the present invention;
fig. 14 is a flowchart of a cross-base station handover cancellation method according to a seventh alternative embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In this embodiment, a processing method for reestablishment in a handover process across a base station is provided, and fig. 1 is a flowchart of a processing method for reestablishment in a handover process across a base station according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:
step S102, when the target base station receives the RRC connection reestablishment request of the UE in the switching preparation stage, the target base station suspends the switching preparation process and executes the RRC connection reestablishment process;
step S104, when the target base station receives the RRC connection reestablishment completion message of the UE, the target base station activates a switching preparation process, sends an RRC connection reconfiguration message to the UE, and sends a switching confirmation message carrying the expansion reason value to the MME or the source base station.
Through the steps, when the target base station receives an RRC connection reestablishment request of the UE in a handover preparation stage, the target base station suspends the executing handover preparation process, reestablishes the RRC connection with the UE by sending an RRC connection reestablishment message to the UE, activates the suspended handover preparation process when the target base station receives an RRC connection reestablishment completion message of the UE, sends an RRC connection reconfiguration message to the UE, and sends a handover confirmation message carrying the extended cause value. Therefore, by adopting the steps, the problem that the UE is dropped due to the fact that the target base station receives the RRC connection reestablishment request in the cross-base-station switching preparation stage in the related technology is solved, the occurrence rate of the UE dropped due to the failure of RRC connection reestablishment in the switching preparation process is reduced, and the switching stability and the user experience degree are improved.
Optionally, since the target base station sends the RRC connection reconfiguration message to the UE, after the source base station receives the handover confirmation message carrying the extended cause value, the source base station does not need to send the RRC connection reconfiguration message to the UE according to the indication of the extended cause value, and when the handover type is S1 handover, the target base station may send the handover confirmation message carrying the extended cause value for indicating that the source base station does not send the RRC connection reconfiguration message to the MME, and the MME indicates that the source base station does not send the RRC connection reconfiguration message to the UE by carrying the cause value in the handover command sent to the source base station.
For example: in step S104, when the handover type is S1 handover, the target base station may send a handover confirm message carrying an extended cause value to the MME, where the extended cause value is used to instruct the MME to send a handover command carrying the extended cause value to the source base station and instruct the source base station not to send an RRC connection reconfiguration message to the UE. Through the steps, the target base station informs the source base station not to send the RRC connection reconfiguration message to the UE through the MME, so that the waste of RRC connection resources can be avoided, meanwhile, under the condition that the source base station and the UE are disconnected, the UE cannot receive the message sent by the source base station, so that the failure of RRC connection reconfiguration is caused, the target base station indicates the UE to carry out RRC connection reconfiguration and indicates the source base station not to send the RRC connection reconfiguration message, the occurrence rate of UE call drop caused by the failure of RRC connection reestablishment in the switching preparation process is reduced, and the switching stability and the user experience degree are improved.
Optionally, because the target base station sends the RRC connection reconfiguration message to the UE, after the source base station receives the handover confirmation message carrying the extended cause value, the source base station does not need to send the RRC connection reconfiguration message to the UE according to the indication of the extended cause value, and when the handover type is X2 handover, the target base station may send the handover confirmation message carrying the extended cause value for indicating that the source base station does not send the RRC connection reconfiguration message to the source base station to indicate that the source base station does not send the RRC connection reconfiguration message to the UE.
For example: in step S104, when the handover type is X2 handover, the target base station may send a handover confirmation message carrying an extended cause value to the source base station, where the extended cause value is used to instruct the source base station not to send an RRC connection reconfiguration message to the UE. Through the steps, the target base station informs the source base station not to send the RRC connection reconfiguration message to the UE, so that the waste of RRC connection resources can be avoided, meanwhile, under the condition that the source base station is disconnected from the UE, the UE cannot receive the message sent by the source base station, so that the failure of RRC connection reconfiguration is caused, the target base station indicates the UE to carry out RRC connection reconfiguration and indicates the source base station not to send the RRC connection reconfiguration message, the occurrence rate of UE call drop caused by the failure of RRC connection reestablishment in the switching preparation process is reduced, and the switching stability and the user experience degree are improved.
Alternatively, after step S104, the target base station may start an RRC connection reconfiguration complete timer to control the RRC connection reconfiguration process, and when the RRC connection reconfiguration complete message is received before the RRC connection reconfiguration complete timer expires, the target base station may confirm that the UE successfully completes the handover.
Optionally, when the target base station confirms that the UE completes the handover successfully, the target base station may send a path conversion request message or a handover notification message to the MME, notifying the MME that the UE completes the handover successfully. Thereafter, the MME may notify the source base station to release the context resource of the UE, or the MME may reply the path conversion request acknowledgement message to the target base station, and then the target base station notifies the source base station to release the context resource of the UE.
Optionally, after the target base station starts the RRC connection reconfiguration complete timer, the target base station may further execute the RRC connection resource release procedure of the UE when the RRC connection reconfiguration complete timer is overtime and the RRC connection reconfiguration complete message is not received.
Optionally, in a case that the handover type is S1 handover and the target base station does not receive the RRC connection reestablishment complete message of the UE, after step S102, the target base station may receive a UE context release command sent by the MME, and at this time, the target base station may send an RRC connection reestablishment reject message to the UE and send a UE context release complete message to the MME according to the UE context release command. Alternatively, in the case that the handover type is X2 handover and the target base station does not receive the RRC connection re-establishment complete message of the UE, after step S102, the target base station may receive a handover cancel message sent by the source base station, and at this time, the target base station may send an RRC connection re-establishment reject message to the UE according to the handover cancel message.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a processing apparatus for reestablishing in a handover process across a base station is further provided, and is applied to the base station, where the apparatus is used to implement the foregoing embodiments and optional embodiments, and details are not repeated for what has been described. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 2 is a block diagram of a processing apparatus for re-establishment in a cross-base station handover process according to an embodiment of the present invention, and as shown in fig. 2, the apparatus includes: a first processing module 22 and a second processing module 24, where the first processing module 22 is configured to suspend a handover preparation procedure and execute an RRC connection reestablishment procedure when the base station receives an RRC connection reestablishment request of the UE in a handover preparation phase as a target base station; the second processing module 24 is coupled to the first processing module 22, and configured to activate a handover preparation procedure when receiving an RRC connection reestablishment complete message of the UE, send an RRC connection reconfiguration message to the UE, and send a handover confirmation message carrying the extended cause value to the MME or the source base station.
Optionally, the second processing module 24 is configured to: and under the condition that the switching type is S1 switching, sending a switching confirmation message carrying an extended reason value to the MME, wherein the extended reason value is used for indicating the MME to send a switching command carrying the extended reason value to the source base station and indicating the source base station not to send an RRC connection reconfiguration message to the UE.
Optionally, the second processing module 24 is configured to: and under the condition that the switching type is X2 switching, sending a switching confirmation message carrying an extended reason value to the source base station, wherein the extended reason value is used for indicating the source base station not to send an RRC connection reconfiguration message to the UE.
Fig. 3 is a block diagram of an optional structure of a processing apparatus reestablished in a handover procedure between base stations according to an embodiment of the present invention, as shown in fig. 3, optionally, the apparatus further includes: a starting module 32 and a confirming module 34, wherein the starting module 32 is coupled to the second processing module 24 and configured to start an RRC connection reconfiguration complete timer; a confirming module 34, coupled to the starting module 32, configured to confirm that the UE successfully completes the handover when the RRC connection reconfiguration complete message is received before the RRC connection reconfiguration complete timer expires.
Fig. 4 is a block diagram of an optional structure of a processing apparatus reestablished in a handover procedure between base stations according to an embodiment of the present invention, as shown in fig. 4, optionally, the apparatus further includes: a first sending module 42, coupled to the confirming module 34, configured to send a path conversion request message or a handover notification message to the MME, where the path conversion request message or the handover notification message is used to indicate that the UE has successfully completed handover.
Fig. 5 is a block diagram of an optional structure of a processing apparatus reestablished in a handover procedure between base stations according to an embodiment of the present invention, as shown in fig. 5, optionally, the apparatus further includes: an executing module 52, coupled to the starting module 32, is configured to execute the RRC connection resource release procedure of the UE when the RRC connection reconfiguration complete timer expires and the RRC connection reconfiguration complete message is not received.
Fig. 6 is a block diagram of an optional structure of a processing apparatus reestablished in a handover procedure between base stations according to an embodiment of the present invention, as shown in fig. 6, optionally, the apparatus further includes: a first receiving module 62 and a second sending module 64, wherein the first receiving module 62 is coupled to the second processing module 24, and configured to receive a UE context release command sent by the MME when the handover type is the S1 handover type and the RRC connection reestablishment complete message of the UE is not received; a second sending module 64, coupled to the first receiving module 62, configured to send an RRC connection reestablishment reject message to the UE and send a UE context release complete message to the MME according to the UE context release command.
Fig. 7 is a block diagram of an optional structure of a processing apparatus reestablished in a cross-base station handover process according to an embodiment of the present invention, as shown in fig. 7, optionally, the apparatus further includes: a second receiving module 72 and a third sending module 74, where the second receiving module 72 is coupled to the second processing module 24, and is configured to receive a handover cancel message sent by the source base station when the handover type is X2 handover and the RRC connection reestablishment complete message of the UE is not received; a third sending module 74, coupled to the second receiving module 72, is configured to send an RRC connection re-establishment rejection message to the UE according to the handover cancel message.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.
The embodiment of the present invention also provides software for implementing the technical solutions described in the above embodiments and optional embodiments.
The embodiment of the invention also provides a storage medium. In the present embodiment, the storage medium described above may be configured to store program code for performing the steps of:
step S102, when the target base station receives the RRC connection reestablishment request of the UE in the switching preparation stage, the target base station suspends the switching preparation process and executes the RRC connection reestablishment process;
step S104, when the target base station receives the RRC connection reestablishment completion message of the UE, the target base station activates a switching preparation process, sends an RRC connection reconfiguration message to the UE, and sends a switching confirmation message carrying the expansion reason value to the MME or the source base station.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
In order to make the description of the embodiments of the present invention clearer, the following description and illustrations are made with reference to alternative embodiments.
For a scenario that a re-establishment request is received when a handover target base station is in a handover preparation phase, according to the prior art, the following two assumed processing schemes are provided:
assume one: the handover target base station replies a handover preparation failure message to the handover source base station, which inevitably causes the handover source base station to re-initiate the next handover to other base stations or cells or release the UE, and actually the UE has lost the RRC connection with the handover source base station, so that the handover target base station will refuse to reestablish the RRC connection of the UE.
Assume two: the handover target base station replies a handover confirmation message to the handover source base station, and actually the UE has lost the RRC connection with the handover source base station, and the handover source base station still issues a reconfiguration message of the handover command to the UE, which results in a waste of radio resources of the handover source base station.
Therefore, no matter which assumption processing scheme is adopted, the problem that the UE call drop is caused by the reestablishment failure in the scenario that the handover target base station receives the reestablishment request in the handover preparation stage cannot be reasonably and effectively solved.
The invention relates to an LTE mobile communication system, and provides a method and a device for processing reestablishment in a cross-base-station switching process. By the processing strategy that the target base station receives the RRC connection reestablishment request in the cross-base station switching preparation stage, which is provided by the optional embodiment of the invention, the problem and the defect that the UE call drop is caused by the reestablishment failure caused by the target side base station receiving the RRC connection reestablishment request message in the switching preparation stage when the inter-station S1/X2 is switched in the prior art can be overcome, the occurrence rate of the UE call drop caused by the RRC connection reestablishment failure in the switching preparation process is reduced, and the switching stability and the user experience degree are improved.
The handover method provided by the alternative embodiment of the present invention includes the following five steps:
the first step is as follows: the base station at the switching target side receives the RRC connection reestablishment request message of the UE in the preparation phase.
The second step is that: the base station at the switching target side suspends the switching preparation flow, preferentially executes the RRC connection reestablishment flow, and issues an RRC connection reestablishment message.
The third step: after receiving the RRC connection reestablishment completion message sent by the UE, the target base station issues an RRC connection reconfiguration message to the UE, simultaneously starts a timer waiting for the RRC connection reconfiguration completion, activates the suspended switching, and then judges the type of the suspended cross-base station switching (S1 switching or X2 switching).
The fourth step: if the previously suspended cross base station handover type is an S1 handover:
and (a) replying a switching confirmation to the MME and carrying the extended reason value, after the S1 switching source side base station receives the switching command carrying the extended reason value sent by the MME, not sending a switching command reconfiguration message to the UE according to the indication of the extended reason value, and processing other switching commands according to a normal S1 switching process.
And (b) if the target base station receives the RRC connection reconfiguration complete message before the RRC connection reconfiguration complete timer is overtime, the target base station replies a switching notification message to the MME to notify that the S1 switching is successful.
And c, if the target base station does not receive the RRC connection reconfiguration finishing message after the RRC connection reconfiguration finishing timer is overtime, the target base station directly executes the RRC release process.
The fifth step: if the previously suspended cross base station handover type is an X2 handover:
and a switching confirmation message is sent to the eNB at the switching source side and carries the extended reason value, after the base station at the switching source side receives the switching confirmation message, the base station at the switching source side does not issue a switching command reconfiguration message to the UE according to the indication of the extended reason value, and other processes are carried out according to a normal X2 switching flow.
And if the target base station receives the RRC connection reconfiguration finishing message before the RRC connection reconfiguration finishing timer is overtime, the target base station replies a path conversion request message to the MME to inform that the X2 is successfully switched.
And c, if the target base station does not receive the RRC connection reconfiguration finishing message after the RRC connection reconfiguration finishing timer is overtime, the target base station directly executes the UE context release process.
An alternative embodiment of the present invention will now be described with reference to the accompanying drawings.
Alternative embodiment 1
An alternative embodiment of the present invention provides a handover processing method when an RRC connection reestablishment request is received during a handover procedure. Fig. 8 is a flowchart of a processing method for reestablishment in a handover procedure between base stations according to an alternative embodiment of the present invention, and as shown in fig. 8, the flowchart includes the following steps:
step S802, the handover target base station receives the RRC connection reestablishment request message of the UE in the preparation phase.
Step S804, the target base station suspends the handover preparation procedure, preferentially executes the RRC connection reestablishment procedure, and issues an RRC connection reestablishment message.
Step S806, after the target base station receives the RRC connection reestablishment completion, the target base station issues an RRC connection reconfiguration message to the UE, and at the same time, starts a timer waiting for the completion of the RRC connection reconfiguration, activates the suspended handover, determines the corresponding handover type (S1 handover or X2 handover), and executes the subsequent procedures.
Step S808, if the previously suspended cross base station handover type is S1 handover:
< a > reply handover acknowledgement to MME and carry extension cause value: in the handover preparation phase, an RRC connection reestablishment request (Receive request during HO Prepare) is received, and after the S1 handover source base station receives the handover command carrying the cause value sent by the MME, according to the cause value indication, the handover source base station does not issue a handover command reconfiguration message to the UE, and the other handover source base stations perform processing according to the normal S1 handover procedure.
And (b) before waiting for the time-out of the RRC connection reconfiguration complete timer, under the condition that the base station receives the RRC connection reconfiguration complete message, the target base station replies a switching notification message to the MME to notify that the S1 is successfully switched.
And c, after waiting for the time-out of the RRC connection reconfiguration finishing timer, under the condition that the RRC connection reconfiguration finishing message is not received, the target base station directly executes the release process of the RRC connection.
Step S810, if the previously suspended cross base station handover type is X2 handover:
and < a > the target base station sends a switching confirmation message to the switching source side base station and carries an extension reason value: after receiving the handover confirmation message, the handover source base station does not issue a handover command reconfiguration message to the UE according to the cause value indication, and the other processes are performed according to a normal X2 handover flow.
And (b) before waiting for the time-out of the RRC connection reconfiguration finishing timer, under the condition that the base station receives the RRC connection reconfiguration finishing message, the target base station replies a path conversion request message to the MME to inform that the X2 is successfully switched.
And c, after waiting for the time-out of the RRC connection reconfiguration finishing timer, under the condition that an RRC connection reconfiguration finishing message is not received, the target base station directly executes the UE context release process.
An alternative embodiment two:
an alternative embodiment of the present invention provides a handover processing method for receiving an RRC connection reestablishment request in an X2 handover preparation phase. Fig. 9 is a flowchart of a processing method for reestablishment in a handover procedure between base stations according to a second alternative embodiment of the present invention, and as shown in fig. 9, the flowchart includes the following steps:
step S902, the base station receives the measurement report message sent by the UE, the base station is used as the switching source side, judges to execute the X2 switching, and initiates an X2 switching request message to the target side base station.
In step S904, the handover target base station performs a handover preparation procedure after receiving the X2 handover request message from the handover source base station.
Step S906, after the UE has failed in the radio link due to the radio environment or the like, starts an RRC connection reestablishment procedure, and initiates an RRC connection reestablishment request message.
Step S908 is to suspend the currently executed handover after the target base station receives the RRC connection reestablishment request message, perform the reestablishment, and issue an RRC connection reestablishment message to the UE.
Step S910, after receiving the RRC connection reestablishment complete message, the target base station activates the suspended handover procedure, issues an RRC connection reestablishment message to the UE, starts a timer waiting for completing the RRC connection reestablishment, and replies a handover confirmation message carrying a Receive request duration HO Prepare to the handover source base station.
In step S912, after receiving the handover command of the handover target base station, the source base station does not issue a reconfiguration message of the handover command to the UE according to the extension cause value carried in the handover command, and performs operations such as data back-transmission.
Step S914, after receiving the RRC connection reconfiguration complete message, the target base station stops the RRC connection reconfiguration complete waiting timer, and sends a path switching request message (pathswitchrequust) to the MME.
Step S916, the target base station receives the path conversion request acknowledge message (pathswitch requustacknowledgement) replied by the MME, which indicates that the X2 is successfully switched, and sends a UE context release message (UeContextRelease) to the source-side base station, which releases information such as radio resources of the source-side base station.
Alternative embodiment three
An alternative embodiment of the present invention provides a handover processing method that receives an RRC connection reestablishment request in a handover preparation phase of S1. Fig. 10 is a flowchart of a processing method for reestablishment in a handover procedure between base stations according to a third alternative embodiment of the present invention, and as shown in fig. 10, the flowchart includes the following steps:
step S1002, the base station receives the measurement report message sent by the UE, the base station is used as the switching source side, judges to execute S1 switching, and initiates an S1 switching request message to the MME.
In step S1004, the handover target base station executes a handover preparation procedure after receiving the S1 handover request message from the MME.
Step S1006, when the UE fails in the radio link due to the radio environment or the like, starts an RRC connection re-establishment procedure and initiates an RRC connection re-establishment request message.
Step S1008, after receiving the RRC connection reestablishment request message, the target base station suspends the handover being executed, executes RRC connection reestablishment, and issues an RRC connection reestablishment message to the UE.
Step S1010, after receiving the RRC connection reestablishment completion message, the base station activates the suspended switching process, issues an RRC connection reconfiguration message to the UE, starts a timer for waiting the RRC connection reconfiguration completion, and simultaneously replies a switching confirmation message carrying an extended reason value to the MME: a Receive request document during HO Prepare.
Step S1012, after receiving the handover command message, the source base station does not issue an RRC connection reconfiguration message of the handover command according to the extended cause value carried in the handover command, and performs operations such as data back-transmission.
In step S1014, after receiving the RRC connection reconfiguration complete message, the target base station stops the RRC connection reconfiguration complete waiting timer, and replies a handover notification message (handover notification) to the MME.
Alternative embodiment four
An optional fourth embodiment of the present invention provides a handover processing method, where after an RRC connection reestablishment request is received in an X2 handover preparation phase, the handover processing method fails to successfully reconfigure the UE. Fig. 11 is a flowchart of a processing method for reestablishment in a handover procedure between base stations according to a fourth alternative embodiment of the present invention, where as shown in fig. 11, the flowchart includes the following steps:
step S1102, the base station receives the measurement report message sent by the UE, and the base station, as the handover source side, decides to execute X2 handover, and initiates an X2 handover request message to the target base station.
In step S1104, after receiving the X2 handover request from the handover source base station, the handover target base station performs a handover preparation procedure.
Step S1106, when the UE fails in the radio link due to the radio environment or the like, starts an RRC connection re-establishment procedure and initiates an RRC connection re-establishment request message.
In step S1108, after receiving the RRC connection reestablishment request message, the target base station suspends the currently executed handover, executes RRC connection reestablishment, and issues an RRC connection reestablishment message to the UE.
Step S1110, after receiving the RRC connection reestablishment complete message, the target base station activates the suspended handover procedure, issues an RRC connection reestablishment message to the UE, starts a timer waiting for completing the RRC connection reestablishment, and replies a handover confirmation message carrying a Receive request duration HO Prepare to the handover source base station.
Step S1112, after receiving the handover command message of the handover target base station, the source base station does not issue a reconfiguration message of the handover command according to the extension cause value carried in the handover command, and performs operations such as data back-transmission.
Step S1114 is executed to perform an RRC connection resource release procedure by the target base station when the target base station has not received the RRC connection reconfiguration complete message after the RRC connection reconfiguration complete waiting timer expires.
In step S1116, the handover source side base station waits for the UE context release message (UeContextRelease) timer of the handover target side base station to expire, and triggers the UE context release process.
Alternative embodiment five
An alternative embodiment of the present invention provides a handover processing method that fails to successfully reconfigure the UE after receiving an RRC connection reestablishment request in the handover preparation phase of S1. Fig. 12 is a flowchart of a processing method for reestablishment in a handover procedure between base stations according to a fifth alternative embodiment of the present invention, where as shown in fig. 12, the flowchart includes the following steps:
step S1202, the base station receives the measurement report message sent by the UE, the base station is used as a switching source side, judges to execute S1 switching, and initiates an S1 switching request message to the MME.
In step S1204, the handover target base station executes a handover preparation procedure after receiving the S1 handover request message from the MME.
Step S1206, when the UE fails in the radio link due to the radio environment or the like, starts an RRC connection reestablishment procedure, and initiates an RRC connection reestablishment request message.
In step S1208, after receiving the RRC connection reestablishment request message, the target base station suspends the handover being executed, executes reestablishment, and issues an RRC connection reestablishment message to the UE.
Step S1210, after receiving the RRC connection reestablishment complete message, the target base station activates the suspended handover procedure, issues an RRC connection reestablishment message to the UE, starts a timer waiting for the completion of the RRC connection reestablishment, and replies a handover confirmation message carrying a Receive request duration HO Prepare to the MME.
In step S1212, after receiving the handover command, the source base station does not send the RRC connection reconfiguration message of the handover command according to the extended cause value carried in the handover command, and performs operations such as data back-transmission.
Step S1214, when the handover target base station waits for the RRC connection reconfiguration complete timer to exceed, performs the UE context release procedure.
Alternative embodiment six
An alternative embodiment of the present invention provides a method for performing handover cancellation in a reestablishment process after receiving an RRC connection reestablishment request in an X2 handover preparation phase. Fig. 13 is a flowchart of a cross-base station handover cancellation method according to a sixth alternative embodiment of the present invention, and as shown in fig. 13, the flowchart includes the following steps:
step S1302, the base station receives the measurement report message sent by the UE, and the base station, as a handover source side, determines to execute X2 handover, initiates an X2 handover request message to the target base station, and starts a waiting timer (T _ X2 hopprep) in an X2 handover preparation phase.
In step S1304, the handover target base station performs a handover preparation procedure after receiving the X2 handover request message from the handover source base station.
In step S1306, due to the radio environment or the like, when the UE has a radio link failure, the UE starts an RRC connection re-establishment procedure and initiates an RRC connection re-establishment request message.
Step S1308, after receiving the RRC connection reestablishment request message, the target base station suspends the ongoing handover, performs RRC connection reestablishment, and issues an RRC connection reestablishment message to the UE.
Step S1310, after the T _ X2 hopprep waiting timer expires, the handover source side base station triggers a handover cancel procedure, sends a handover cancel message to the handover target side base station, and then performs a UE context release procedure.
Step S1312, after receiving the handover cancel initiated by the handover source base station, the handover target base station cancels the RRC connection reestablishment procedure and the suspended handover resource, and issues an RRC connection reestablishment reject message to the UE.
Alternative embodiment seven
An alternative embodiment of the present invention provides a method for performing handover cancellation in a reestablishment process after receiving an RRC connection reestablishment request in an S1 handover preparation phase. Fig. 14 is a flowchart of a cross-base station handover cancellation method according to a seventh alternative embodiment of the present invention, and as shown in fig. 14, the flowchart includes the following steps:
in step S1402, the base station receives the measurement report message sent by the UE, and the base station, as the source of the handover source, determines to execute S1 handover, initiates S1 handover request message to the MME, and starts S1 a waiting timer (T _ S1HoPrep) in a handover preparation phase.
In step S1404, the handover target base station performs a handover preparation procedure after receiving the S1 handover request message from the MME.
Step S1406, when the UE has a radio link failure due to a radio environment or the like, starts an RRC connection re-establishment procedure and initiates an RRC connection re-establishment request message.
Step S1408, after receiving the RRC connection reestablishment request message, the target base station suspends the handover being executed, executes RRC connection reestablishment, and issues an RRC connection reestablishment message to the UE.
Step S1410, after the T _ S1 hopprep waiting timer expires, the handover source side base station sends a handover cancel message to the MME.
In step S1412, the target base station indicates to cancel handover after receiving the UE context release command from the MME, cancels the RRC connection reestablishment procedure and the suspended handover resource, issues an RRC connection reestablishment reject message to the UE, and replies a UE context release complete message to the MME.
In summary, with the processing method and apparatus for reestablishment in the handover process of a cross base station according to the embodiments and optional embodiments of the present invention, compared with the prior art, a processing strategy is provided in which an inter-station S1/X2 handover target base station receives an RRC connection reestablishment request in a cross base station handover preparation phase, thereby reducing an occurrence rate of a UE call drop caused by an RRC connection reestablishment failure in the handover preparation process, and improving handover stability and user experience.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only an alternative embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (16)

1. A processing method for reestablishment in a cross-base-station switching process is characterized by comprising the following steps:
when a target base station receives an RRC connection reestablishment request of User Equipment (UE) in a handover preparation stage, the target base station suspends a handover preparation process and executes an RRC connection reestablishment process;
when the target base station receives an RRC connection reestablishment completion message of the UE, the target base station activates the handover preparation process, sends an RRC connection reconfiguration message to the UE, and sends a handover confirmation message carrying an extended reason value to a Mobility Management Entity (MME) or a source base station, wherein the extended reason value is used for indicating that the source base station does not send the RRC connection reconfiguration message to the UE.
2. The method of claim 1, wherein the target base station sending the handover confirm message carrying the extension cause value comprises:
and under the condition that the handover type is S1 handover, the target base station sends the handover confirmation message carrying the extended cause value to the MME, wherein the extended cause value is used for instructing the MME to send a handover command carrying the extended cause value to the source base station and instructing the source base station not to send an RRC connection reconfiguration message to the UE.
3. The method of claim 1, wherein the target base station sending the handover confirm message carrying the extension cause value comprises:
and under the condition that the handover type is X2 handover, the target base station sends the handover confirmation message carrying the extended reason value to the source base station, wherein the extended reason value is used for indicating that the source base station does not send an RRC connection reconfiguration message to the UE.
4. The method of claim 1, wherein after the target base station sends the RRC connection reconfiguration message to the UE, the method further comprises:
starting an RRC connection reconfiguration completion timer;
and when the RRC connection reconfiguration complete message is received before the RRC connection reconfiguration complete timer is overtime, the target base station confirms that the UE successfully completes the switching.
5. The method of claim 4, wherein after the target base station confirms that the UE successfully completes the handover, the method further comprises:
the target base station sends a path conversion request message or a switching notification message to the MME, wherein the path conversion request message or the switching notification message is used for indicating that the UE has successfully completed switching.
6. The method according to claim 4, wherein in case the RRC connection reconfiguration complete timer expires and the RRC connection reconfiguration complete message is not received, the method further comprises:
and the target base station executes the RRC connection resource release process of the UE.
7. The method according to any of claims 1 to 6, wherein after the target base station suspends the handover preparation procedure, the method further comprises:
under the condition that the switching type is S1 switching and the target base station does not receive the RRC connection reestablishment completion message of the UE, the target base station receives a UE context release command sent by the MME;
and the target base station sends an RRC connection reestablishment rejection message to the UE according to the UE context release command and sends a UE context release completion message to the MME.
8. The method according to any of claims 1 to 6, wherein after the target base station suspends the handover preparation procedure, the method further comprises:
under the condition that the switching type is X2 switching and the target base station does not receive the RRC connection reestablishment completion message of the UE, the target base station receives a switching cancellation message sent by a source base station;
and the target base station sends an RRC connection reestablishment rejection message to the UE according to the switching cancellation message.
9. A processing device for reestablishing in a cross-base-station handover process is applied to a base station, and is characterized by comprising the following steps:
a first processing module, configured to suspend a handover preparation procedure and execute an RRC connection reestablishment procedure when the base station receives an RRC connection reestablishment request of a user equipment UE in a handover preparation phase as a target base station;
a second processing module, configured to activate the handover preparation procedure, send an RRC connection reconfiguration message to the UE, and send a handover confirmation message carrying an extended cause value to a mobility management entity MME or a source base station when receiving an RRC connection reestablishment complete message of the UE, where the extended cause value is used to indicate that the source base station does not send the RRC connection reconfiguration message to the UE.
10. The apparatus of claim 9, wherein the second processing module is configured to:
and sending the handover confirmation message carrying the extended reason value to the MME of the mobility management entity under the condition that the handover type is S1 handover, wherein the extended reason value is used for indicating the MME to send a handover command carrying the extended reason value to the source base station and indicating the source base station not to send an RRC connection reconfiguration message to the UE.
11. The apparatus of claim 9, wherein the second processing module is configured to:
and sending the handover confirmation message carrying the extended reason value to the source base station under the condition that the handover type is X2 handover, wherein the extended reason value is used for indicating that the source base station does not send an RRC connection reconfiguration message to the UE.
12. The apparatus of claim 9, further comprising:
the starting module is used for starting an RRC connection reconfiguration completion timer; a confirming module, configured to confirm that the UE successfully completes handover when the RRC connection reconfiguration complete message is received before the RRC connection reconfiguration complete timer expires.
13. The apparatus of claim 12, further comprising:
a first sending module, configured to send a path conversion request message or a handover notification message to the MME, where the path conversion request message or the handover notification message is used to indicate that the UE has successfully completed handover.
14. The apparatus of claim 12, further comprising:
and the execution module is used for executing the RRC connection resource release process of the UE under the condition that the RRC connection reconfiguration completion timer is overtime and the RRC connection reconfiguration completion message is not received.
15. The apparatus of any one of claims 9 to 14, further comprising:
a first receiving module, configured to receive a UE context release command sent by the MME when a handover type is S1 handover and the RRC connection reestablishment complete message of the UE is not received;
a second sending module, configured to send an RRC connection reestablishment reject message to the UE according to the UE context release command, and send a UE context release complete message to the MME.
16. The apparatus of any one of claims 9 to 14, further comprising:
a second receiving module, configured to receive a handover cancel message sent by a source base station when a handover type is X2 handover and the RRC connection reestablishment complete message of the UE is not received;
a third sending module, configured to send an RRC connection reestablishment reject message to the UE according to the handover cancel message.
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