CN110519811B - LTE base station cell switching method based on S1 interface - Google Patents
LTE base station cell switching method based on S1 interface Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses an LTE base station cell switching method based on an S1 interface, and belongs to the technical field of communication. The method comprises four steps of UE measurement execution, handover preparation, handover execution and handover completion. The method has the advantages that the UE initiates the random access request in advance under the condition of not releasing the connection with the source base station and establishes the connection with the target base station in a periodic trial mode, so that the UE does not need to wait for finishing the bearing admission process between the target base station and the MME and then initiates the random access process from the UE to the target base station. The waiting time of the random access request is reduced, the time overhead of signaling implementation of the switching process is reduced, and the switching speed is improved.
Description
Technical Field
The invention discloses an LTE base station cell switching method based on an S1 interface, and belongs to the technical field of communication.
Background
The handover procedure is one of the most important and complex procedures in mobile communication, and provides continuous uninterrupted communication service and guarantees the service quality of communication by instructing a moving user equipment UE to transfer to a cell with better channel quality than the current serving cell, wherein information interaction of a plurality of network elements is involved. The completeness of the handover function and the handover effect directly affect the quality of service.
The long term evolution system LTE of current operators employs hard handover technology. The hard handoff procedure is as follows: when UE moves from a source cell to a target cell, because the carrier frequencies of the source cell and the target cell are different, the UE immediately breaks the connection with the source cell after entering the target cell, and after the synchronization process, the UE automatically tunes to the new frequency of the target cell to be connected with the target cell, and then establishes a new communication link to complete the switching from the source cell to the target cell. Obviously, in the hard handover, the UE firstly disconnects the link with the source cell and then establishes the link with the target cell, so there is an interruption gap period in the handover process, and the random access process may be stalled for a while due to the long time occupied by the random access process. Hard handoff is a "release-set up" process characterized by "first disconnect, then handoff". And at any time, the UE is connected to only one cell. In summary, hard handover is a slotted handover, and the main disadvantage of the hard handover method of cutting off first and then cutting off is that the handover process is not smooth enough, and handover call drops easily, so that the handover method needs to be optimized.
Disclosure of Invention
Aiming at the prior art, the invention provides an LTE base station cell switching method based on an S1 interface.
The technical scheme of the invention is as follows:
an LTE base station cell switching method based on an S1 interface is characterized by comprising the following steps:
(1) the UE performs the measurements: the source base station issues measurement configuration information to the UE, and the UE starts measurement according to the measurement configuration after receiving the measurement configuration information, wherein the measurement configuration comprises a measurement object, a measurement identifier and report configuration;
(2) preparing for switching: after the source base station receives the measurement report sent back by the UE, the source base station determines a target base station to which the UE needs to be switched, and then the source base station indicates the UE to establish connection with the target base station through a random access process; meanwhile, the source base station sends a switching demand message to a Mobility Management Entity (MME), and the MME sends a switching request message to a target base station to indicate the target base station to enter a bearing admission process of switching admission;
(3) and (3) executing switching: the MME sends a switching command to the source base station, and then the source base station informs the UE to disconnect the source base station, reserve the connection with the target base station and transfer the service data during the switching period to the target base station;
(4) and completing the switching: and the source base station releases resources and links and deletes the user information.
Preferably, the step (1) of the mobile terminal performing measurement comprises the following sub-steps:
(1-1) the source base station issues measurement configuration to the UE, and the measurement type of the UE is configured through a Radio Resource Control (RRC) connection reconfiguration message;
(1-2) the UE performs measurement configuration at an RRC protocol end of the UE according to the measurement configuration issued by the source base station, and sends an RRC connection reconfiguration completion message to the source base station to indicate that the measurement configuration is completed;
(1-3) reporting a measurement report to a source base station by the UE periodically according to the measurement configuration;
(1-4) the source base station analyzes the measurement report, makes a switching decision according to the wireless resource management information, judges whether the UE is switched among cells based on an S1 interface, and judges which target base station is switched to.
Preferably, the step (2) of preparing for switching comprises the sub-steps of:
(2-1) the source base station sends a switching demand message through an S1 interface, and initiates a switching demand to the MME, wherein the switching demand message comprises an MME _ UE _ S1AP _ ID and eNB _ UE _ S1AP _ ID information allocated by the source base station;
(2-2) simultaneously, the source base station sends an RRC connection reconfiguration message to the UE, wherein the RRC connection reconfiguration message comprises an assigned non-collision random access prefix code and an assigned physical random access channel, and instructs the UE to periodically execute a subsequent random access process to establish connection with the target base station under the condition of not cutting off the connection with the source base station, and the subsequent random access process is as follows: UE initiates random access by sending an assigned random access prefix code on an assigned physical random access channel at certain periodic intervals;
(2-3) the MME sends a switching request message to the target base station, wherein the message comprises MME _ UE _ S1AP _ ID allocated by the MME, an EPS list of an Evolved Packet System (EPS) needing to be established and address parameters of data transmission at the MME side corresponding to each EPS bearer;
(2-4) after the target base station is allocated to the required state, carrying out a bearer admission process of switching admission, allocating air interface channel resources and service bearer resources for the access of the UE, after the bearer admission process is completed, the next periodic random access comes, enabling the target base station to generate a random access response, sending the random access response to the UE through a downlink shared channel, completing the random access process, and then returning a switching request confirmation message to the MME by the target base station, wherein the message comprises eNB _ UE _ S1AP _ ID allocated by the target base station and address parameters of data transmission at the side of the target base station corresponding to the successfully admitted EPS bearer;
preferably, the step (3) of performing handover comprises the following substeps:
(3-1) the MME sends a switching command message to the source base station, wherein the message comprises EPS bearing information and a service data forwarding target address during switching;
(3-2) the source base station sends RRC connection reconfiguration information to the UE again, indicates that the UE can be disconnected with the source base station, reserves the connection with the target base station and transfers the service data during the switching to the target base station;
and (3-3) the UE sends an RRC connection reconfiguration completion message to the target base station, and the RRC connection reconfiguration completion message indicates that the handover is successful.
Preferably, the step (4) of completing the handover comprises the following substeps:
(4-1) the target base station sends a path selection request message to the MME, requests the MME to switch a continuous path of the service data, and changes the path into the target base station;
(4-2) after the MME successfully updates the service data channel node address, sending a path selection request confirmation message to the target base station, indicating that the target base station can perform service communication on the new EPS bearer;
(4-3) the target base station sends a switching notification message to notify the MME that the target base station has been successfully accessed;
and (4-4) the target base station sends a user equipment context release message to the source base station, and the source base station enters a resource release process which comprises air interface channel resources and service bearing resources and deletes user information.
The principle of the invention is as follows: the invention adds redundant signaling on the basis of switching signaling flow in 3GPP protocol, and realizes the optimization of the whole signaling flow. The method comprises the following specific steps: the source base station indicates the UE to periodically try to initiate random access to the target base station on the assigned physical random access channel by sending the assigned random access prefix code after determining the target base station to which the UE link is to be switched by analyzing the measurement report of the UE and sending an RRC connection reconfiguration message containing the assigned non-collision random access prefix code and the physical random access channel to the UE. And only after the target base station receives the switching request message sent by the MME and completes the bearing admission process, the next time the periodic random access initiated by the UE enables the target base station to generate a random access response, and the random access response is sent to the UE through the downlink shared channel to complete the random access process. The subsequent process is controlled by signaling of the MME on the S1 interface, instructing the source base station to disconnect from the UE, completing switching of a service data connection path, and releasing air interface channel resources and service bearer resources allocated to the UE on the source base station.
The invention has the following beneficial effects: the UE initiates a random access request in advance under the condition of not releasing the connection with the source base station, and establishes connection with the target base station in a periodic trial mode, so that the UE does not need to wait for the completion of a bearer admission process between the target base station and the MME and then initiates a random access process from the UE to the target base station. The waiting time of the random access request is reduced, the time overhead of signaling implementation of the switching process is reduced, and the switching speed is improved.
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FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention will be better understood by the following description of embodiments thereof, but the applicant's specific embodiments are not intended to limit the invention to the particular embodiments shown, and any changes in the definition of parts or features and/or in the overall structure, not essential changes, are intended to define the scope of the invention.
As shown in fig. 1, the method comprises the following steps:
(1) the UE performs the measurements: the source base station issues measurement configuration information to the UE, and the UE starts measurement according to the measurement configuration after receiving the measurement configuration information, wherein the measurement configuration comprises a measurement object, a measurement identifier and report configuration;
(1-1) the source base station issues measurement configuration to the UE, and the measurement type of the UE is configured through a Radio Resource Control (RRC) connection reconfiguration message;
(1-2) the UE performs measurement configuration at an RRC protocol end of the UE according to the measurement configuration issued by the source base station, and sends an RRC connection reconfiguration completion message to the source base station to indicate that the measurement configuration is completed;
(1-3) reporting a measurement report to a source base station by the UE periodically according to the measurement configuration;
(1-4) the source base station analyzes the measurement report, makes a switching decision according to the wireless resource management information, judges whether the UE is switched among cells based on an S1 interface, and judges which target base station is switched to;
(2) preparing for switching: after the source base station receives the measurement report sent back by the UE, the source base station determines a target base station to which the UE needs to be switched, and then the source base station indicates the UE to establish connection with the target base station through a random access process; meanwhile, the source base station sends a switching demand message to a Mobility Management Entity (MME), and the MME sends a switching request message to a target base station to indicate the target base station to enter a bearing admission process of switching admission;
(2-1) the source base station sends a switching demand message through an S1 interface, and initiates a switching demand to the MME, wherein the switching demand message comprises an MME _ UE _ S1AP _ ID and eNB _ UE _ S1AP _ ID information allocated by the source base station;
(2-2) simultaneously, the source base station sends an RRC connection reconfiguration message to the UE, wherein the RRC connection reconfiguration message comprises an assigned non-collision random access prefix code and an assigned physical random access channel, and instructs the UE to periodically execute a subsequent random access process to establish connection with the target base station under the condition of not cutting off the connection with the source base station, and the subsequent random access process is as follows: UE initiates random access by sending an assigned random access prefix code on an assigned physical random access channel at certain periodic intervals;
(2-3) the MME sends a switching request message to the target base station, wherein the message comprises MME _ UE _ S1AP _ ID allocated by the MME, an EPS list of an Evolved Packet System (EPS) needing to be established and address parameters of data transmission at the MME side corresponding to each EPS bearer;
(2-4) after the target base station is allocated to the required state, carrying out a bearer admission process of switching admission, allocating air interface channel resources and service bearer resources for the access of the UE, after the bearer admission process is completed, the next periodic random access comes, enabling the target base station to generate a random access response, sending the random access response to the UE through a downlink shared channel, completing the random access process, and then returning a switching request confirmation message to the MME by the target base station, wherein the message comprises eNB _ UE _ S1AP _ ID allocated by the target base station and address parameters of data transmission at the side of the target base station corresponding to the successfully admitted EPS bearer;
(3) and (3) executing switching: the MME sends a switching command to the source base station, and then the source base station informs the UE to disconnect the source base station, reserve the connection with the target base station and transfer the service data during the switching period to the target base station;
(3-1) the MME sends a switching command message to the source base station, wherein the message comprises EPS bearing information and a service data forwarding target address during switching;
(3-2) the source base station sends RRC connection reconfiguration information to the UE again, indicates that the UE can be disconnected with the source base station, reserves the connection with the target base station and transfers the service data during the switching to the target base station;
(3-3) the UE sends an RRC connection reconfiguration completion message to the target base station to indicate that the switching is successful;
preferably, the step (4) of completing the handover comprises the following substeps:
(4) and completing the switching: the source base station releases resources and links and deletes user information;
(4-1) the target base station sends a path selection request message to the MME, requests the MME to switch a continuous path of the service data, and changes the path into the target base station;
(4-2) after the MME successfully updates the service data channel node address, sending a path selection request confirmation message to the target base station, indicating that the target base station can perform service communication on the new EPS bearer;
(4-3) the target base station sends a switching notification message to notify the MME that the target base station has been successfully accessed;
and (4-4) the target base station sends a user equipment context release message to the source base station, and the source base station enters a resource release process which comprises air interface channel resources and service bearing resources and deletes user information.
The principle of the invention is as follows: the invention adds redundant signaling on the basis of switching signaling flow in 3GPP protocol, and realizes the optimization of the whole signaling flow. The method comprises the following specific steps: the source base station indicates the UE to periodically try to initiate random access to the target base station on the assigned physical random access channel by sending the assigned random access prefix code after determining the target base station to which the UE link is to be switched by analyzing the measurement report of the UE and sending an RRC connection reconfiguration message containing the assigned non-collision random access prefix code and the physical random access channel to the UE. And only after the target base station receives the switching request message sent by the MME and completes the bearing admission process, the next time the periodic random access initiated by the UE enables the target base station to generate a random access response, and the random access response is sent to the UE through the downlink shared channel to complete the random access process. The subsequent process is controlled by signaling of the MME on the S1 interface, instructing the source base station to disconnect from the UE, completing switching of a service data connection path, and releasing air interface channel resources and service bearer resources allocated to the UE on the source base station.
The invention has the following beneficial effects: the UE initiates a random access request in advance under the condition of not releasing the connection with the source base station, and establishes connection with the target base station in a periodic trial mode, so that the UE does not need to wait for the completion of a bearer admission process between the target base station and the MME and then initiates a random access process from the UE to the target base station. The waiting time of the random access request is reduced, the time overhead of signaling implementation of the switching process is reduced, and the switching speed is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (4)
1. An LTE base station cell switching method based on an S1 interface is characterized by comprising the following steps:
step (1) the UE performs measurement: the source base station issues measurement configuration information to the UE, and the UE starts measurement according to the measurement configuration after receiving the measurement configuration information, wherein the measurement configuration comprises a measurement object, a measurement identifier and report configuration;
the step (2) of preparing for switching comprises the following substeps:
(2-1) the source base station sends a switching demand message through an S1 interface, and initiates a switching demand to the MME, wherein the switching demand message comprises an MME _ UE _ S1AP _ ID and eNB _ UE _ S1AP _ ID information allocated by the source base station;
(2-2) simultaneously, the source base station sends an RRC connection reconfiguration message to the UE, wherein the RRC connection reconfiguration message comprises an assigned non-collision random access prefix code and an assigned physical random access channel, and instructs the UE to periodically execute a subsequent random access process to establish connection with the target base station under the condition of not cutting off the connection with the source base station, and the subsequent random access process is as follows: UE initiates random access by sending an assigned random access prefix code on an assigned physical random access channel at certain periodic intervals;
(2-3) the MME sends a switching request message to the target base station, wherein the message comprises MME _ UE _ S1AP _ ID allocated by the MME, an EPS list of an Evolved Packet System (EPS) needing to be established and address parameters of data transmission at the MME side corresponding to each EPS bearer;
(2-4) after the target base station is allocated to the required state, carrying out a bearer admission process of switching admission, allocating air interface channel resources and service bearer resources for the access of the UE, after the bearer admission process is completed, the next periodic random access comes, enabling the target base station to generate a random access response, sending the random access response to the UE through a downlink shared channel, completing the random access process, and then returning a switching request confirmation message to the MME by the target base station, wherein the message comprises eNB _ UE _ S1AP _ ID allocated by the target base station and address parameters of data transmission at the side of the target base station corresponding to the successfully admitted EPS bearer;
step (3) executing switching: the MME sends a switching command to the source base station, and then the source base station informs the UE to disconnect the source base station, reserve the connection with the target base station and transfer the service data during the switching period to the target base station;
and (4) completing switching: and the source base station releases resources and links and deletes the user information.
2. The LTE base station cell switching method based on S1 interface of claim 1, wherein: the step (1) of the mobile terminal performing measurement comprises the following substeps:
(1-1) the source base station issues measurement configuration to the UE, and the measurement type of the UE is configured through RRC connection reconfiguration information;
(1-2) the UE performs measurement configuration at an RRC protocol end of the UE according to the measurement configuration issued by the source base station, and sends an RRC connection reconfiguration completion message to the source base station to indicate that the measurement configuration is completed;
(1-3) reporting a measurement report to a source base station by the UE periodically according to the measurement configuration;
(1-4) the source base station analyzes the measurement report, makes a switching decision according to the wireless resource management information, judges whether the UE is switched among cells based on an S1 interface, and judges which target base station is switched to.
3. The LTE base station cell switching method based on S1 interface of claim 1, wherein: the step (3) of performing handover comprises the sub-steps of:
(3-1) the MME sends a switching command message to the source base station, wherein the message comprises EPS bearing information and a service data forwarding target address during switching;
(3-2) the source base station sends RRC connection reconfiguration information to the UE again, indicates that the UE can be disconnected with the source base station, reserves the connection with the target base station and transfers the service data during the switching to the target base station;
and (3-3) the UE sends an RRC connection reconfiguration completion message to the target base station, and the RRC connection reconfiguration completion message indicates that the handover is successful.
4. The LTE base station cell switching method based on S1 interface of claim 1, wherein: the step (4) of completing the switching comprises the following substeps:
(4-1) the target base station sends a path selection request message to the MME, requests the MME to switch a continuous path of the service data, and changes the path into the target base station;
(4-2) after the MME successfully updates the service data channel node address, sending a path selection request confirmation message to the target base station, indicating that the target base station can perform service communication on the new EPS bearer;
(4-3) the target base station sends a switching notification message to notify the MME that the target base station has been successfully accessed;
and (4-4) the target base station sends a user equipment context release message to the source base station, and the source base station enters a resource release process which comprises air interface channel resources and service bearing resources and deletes user information.
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