CN111093233A - Switching control method, device and base station - Google Patents

Switching control method, device and base station Download PDF

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Publication number
CN111093233A
CN111093233A CN201811243133.6A CN201811243133A CN111093233A CN 111093233 A CN111093233 A CN 111093233A CN 201811243133 A CN201811243133 A CN 201811243133A CN 111093233 A CN111093233 A CN 111093233A
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China
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base station
target base
data
handover
wireless data
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CN201811243133.6A
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CN111093233B (en
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刘亮
刘洋
胡南
刘光毅
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]

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

Abstract

The invention provides a switching control method, a device and a base station, wherein the method comprises the following steps: sending a switching request message to a target base station, and receiving a switching request confirmation message sent by the target base station or receiving a switching rejection message sent by the target base station; after receiving a switching request confirmation message sent by a target base station, sending a switching command for indicating the terminal to switch to the target base station to the terminal, and sending an SN state report to the target base station according to a first mapping relation and a second mapping relation, wherein the SN state report carries the SN of the next protocol data unit PDU to be transmitted; the embodiment of the invention acquires the second mapping relation through the switching request confirmation message and sends the SN state report to the target base station according to the first mapping relation and the second mapping relation, thereby ensuring the continuity of data transmission by using the same SN for the target base station and realizing the lossless switching among the base stations.

Description

Switching control method, device and base station
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a handover control method, an apparatus, and a base station.
Background
The LTE (long term evolution) uses the concept of end-to-end Bearer, where EPS (Evolved Packet System) Bearer and E-RAB (Evolved Radio Access Bearer) are in a one-to-one correspondence relationship, and the QoS (Quality of Service) management mechanism in LTE uses Bearer as the minimum granularity.
In 5G, in order to achieve QoS management with finer granularity, a management mechanism based on QoS flow is introduced, and 5G system architecture and flow protocols TS 23.501 and 23.502 that have been completed by 3GPP form the following conclusions: the core Network side cancels the concept of bearer and introduces the QoS flow, but the RAN (Radio Access Network ) side still retains the concept of DRB (Data resource bearer); the terminal can simultaneously establish one or more PDU (Protocol Data Unit) sessions, each PDU session contains one or more QoS flows (QoS flows), and multiple QoS flows can be mapped into one DRB.
Since RRM (Radio Resource Management) strategies and channel conditions of different base stations are different, there is a scenario where mapping relationships between QoS streams supported by a source base station and a target base station to DRBs are different during handover after a stream-based QoS Management mechanism is introduced in 5G, and thus, the handover mechanism and the handover procedure of the existing LTE cannot be supported.
Disclosure of Invention
The invention aims to provide a switching control method, a switching control device and a base station, and aims to solve the problem that the existing switching mechanism and flow between base stations cannot support a 5G system.
In order to solve the above problem, an embodiment of the present invention provides a handover control method, applied to a source base station, including:
sending a switching request message to a target base station, wherein the switching request message carries a first mapping relation between a service quality flow of a source base station and a wireless data bearer;
receiving a switching request confirmation message sent by a target base station, or receiving a switching refusing message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
Wherein the handover request message further comprises at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
Wherein the handover request message further comprises:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
Wherein, in case the handover request message includes a PDU session based data forward proposal, the handover request acknowledge message further includes: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the method further comprises the following steps:
forwarding data packets to the target base station on the first data forwarding tunnel according to the address information of the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
Wherein, in case the handover request message includes a data forward proposal based on a wireless data bearer, the handover request confirm message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
Wherein the method further comprises:
and after receiving a switching request confirmation message sent by the target base station, sending a switching command for indicating the terminal to switch to the target base station to the terminal, and sending a Serial Number (SN) state report to the target base station.
Wherein, the sending the SN status report to the target base station includes:
sending a SN state report of a serial number to a target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forward transmission of the source base station and the target base station is based on PDU conversation, wherein the SN state report carries the SN of the next PDU to be transmitted;
and sending a Serial Number (SN) status report to the target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forwarding of the source base station and the target base station is based on a Service Data Unit (SDU), wherein the SN status report carries the SN of the next PDU to be transmitted and the identification information of the service quality flow corresponding to the SN of the next PDU to be transmitted.
Wherein, the sending the SN status report to the target base station includes:
under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the source base station are duplicated, redistributing the SNs for the PDUs contained in at least one wireless data bearer of the source base station so that the SNs of the PDUs contained in different wireless data bearers of the source base station are not duplicated;
and sending a sequence number SN status report to the target base station, wherein the SN status report carries the SN after the next PDU to be transmitted is reallocated and the reallocation information of the SN.
Wherein, the sending the SN status report to the target base station includes:
and sending a SN state report of a serial number to the target base station under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the target base station are discontinuous, wherein the SN state report carries the SN of the next PDU to be transmitted carried by different wireless data bearers of the target base station.
The embodiment of the invention also provides a switching control method, which is applied to a target base station and comprises the following steps:
receiving a switching request message sent by a source base station, wherein the switching request message carries a first mapping relation between a service quality flow of the source base station and a wireless data bearer;
sending a switching request confirmation message to the source base station, or sending a switching refusing message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
Wherein the handover request message further comprises at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
Wherein the handover request message further comprises:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
Wherein, in case the handover request message includes a PDU session based data forward proposal, the handover request acknowledge message further includes: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the method further comprises the following steps:
and receiving data packets forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
Wherein, in case the handover request message includes a data forward proposal based on a wireless data bearer, the handover request confirm message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
Wherein the method further comprises:
and after a switching request confirmation message is sent to the source base station, receiving a serial number SN status report sent by the source base station.
An embodiment of the present invention further provides a handover control apparatus, applied to a source base station, including:
a request sending module, configured to send a handover request message to a target base station, where the handover request message carries a first mapping relationship between a quality of service flow of a source base station and a radio data bearer;
a receiving module, configured to receive a handover request acknowledgement message sent by a target base station, or receive a handover rejection message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
The embodiment of the present invention further provides a base station, which includes a processor and a transceiver, where the base station is a source base station to which a terminal is currently accessed, and the processor is configured to control the transceiver to execute the following processes:
sending a switching request message to a target base station, wherein the switching request message carries a first mapping relation between a service quality flow of a source base station and a wireless data bearer;
receiving a switching request confirmation message sent by a target base station, or receiving a switching refusing message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
Wherein the handover request message further comprises at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
Wherein the handover request message further comprises:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
Wherein, in case the handover request message includes a PDU session based data forward proposal, the handover request acknowledge message further includes: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the processor is further configured to:
forwarding data packets to the target base station on the first data forwarding tunnel according to the address information of the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
Wherein, in case the handover request message includes a data forward proposal based on a wireless data bearer, the handover request confirm message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
Wherein the processor is further configured to:
and after receiving a switching request confirmation message sent by the target base station, sending a switching command for indicating the terminal to switch to the target base station to the terminal, and sending a Serial Number (SN) state report to the target base station.
Wherein the transceiver is further configured to:
sending a SN state report of a serial number to a target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forward transmission of the source base station and the target base station is based on PDU conversation, wherein the SN state report carries the SN of the next PDU to be transmitted;
and sending a Serial Number (SN) status report to the target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forwarding of the source base station and the target base station is based on a Service Data Unit (SDU), wherein the SN status report carries the SN of the next PDU to be transmitted and the identification information of the service quality flow corresponding to the SN of the next PDU to be transmitted.
Wherein the processor is further configured to:
under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the source base station are duplicated, redistributing the SNs for the PDUs contained in at least one wireless data bearer of the source base station so that the SNs of the PDUs contained in different wireless data bearers of the source base station are not duplicated;
and sending a sequence number SN status report to the target base station, wherein the SN status report carries the SN after the next PDU to be transmitted is reallocated and the reallocation information of the SN.
Wherein the transceiver is further configured to:
and sending a SN state report of a serial number to the target base station under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the target base station are discontinuous, wherein the SN state report carries the SN of the next PDU to be transmitted carried by different wireless data bearers of the target base station.
The embodiment of the present invention further provides a handover control apparatus, which is applied to a target base station, and includes:
a request receiving module, configured to receive a handover request message sent by a source base station, where the handover request message carries a first mapping relationship between a quality of service flow of the source base station and a radio data bearer;
a sending module, configured to send a handover request acknowledgement message to the source base station, or send a handover rejection message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
The embodiment of the present invention further provides a base station, which includes a processor and a transceiver, where the base station is a target base station to which a terminal is to be switched, and the processor is configured to control the transceiver to execute the following processes:
receiving a switching request message sent by a source base station, wherein the switching request message carries a first mapping relation between a service quality flow of the source base station and a wireless data bearer;
sending a switching request confirmation message to the source base station, or sending a switching refusing message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
Wherein the handover request message further comprises at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
Wherein the handover request message further comprises:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
Wherein, in case the handover request message includes a PDU session based data forward proposal, the handover request acknowledge message further includes: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the processor is further configured to:
and receiving data packets forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
Wherein, in case the handover request message includes a data forward proposal based on a wireless data bearer, the handover request confirm message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
Wherein the transceiver is further configured to:
and after a switching request confirmation message is sent to the source base station, receiving a serial number SN status report sent by the source base station.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps in the handover control method described above.
The technical scheme of the invention at least has the following beneficial effects:
in the handover control method, the handover control device and the base station of the embodiments of the present invention, the target base station obtains the second mapping relationship between the qos flow of the target base station and the radio data bearer through the handover request acknowledgement message, and sends the SN status report to the target base station according to the first mapping relationship and the second mapping relationship between the qos flow of the source base station and the radio data bearer, so that the target base station uses the same SN to ensure the continuity of data transmission, thereby implementing lossless handover between base stations.
Drawings
Fig. 1 is a flowchart illustrating a step of a handover control method according to an embodiment of the present invention;
fig. 2 shows one of negotiation signaling diagrams between base stations in the handover control method according to the embodiment of the present invention;
fig. 3 is a second negotiation signaling diagram in the handover control method according to the embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a scheme of data forwarding in a handover control method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a second scheme for data forwarding in the handover control method according to the embodiment of the present invention;
fig. 6 is a schematic diagram of a data forwarding scheme in a handover control method according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a scenario of an SN status report in a handover control method according to an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating a scenario two of an SN status report in the handover control method according to the embodiment of the present invention;
fig. 9 is a schematic diagram illustrating a scenario three of an SN status report in the handover control method according to the embodiment of the present invention;
fig. 10 is a flowchart illustrating a second step of the handover control method according to the embodiment of the present invention;
fig. 11 is a schematic structural diagram of a switching control apparatus according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 13 is a second schematic structural diagram of a switching control device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides a handover control method, applied to a source base station, including:
step 11, sending a handover request message to the target base station, where the handover request message carries a first mapping relationship between a service quality flow of the source base station and a wireless data bearer.
Preferably, step 11 is executed only when the source base station determines to handover the terminal to the target base station.
Step 12, receiving a handover request confirmation message sent by the target base station, or receiving a handover rejection message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
In the above embodiment of the present invention, step 11 and step 12 are switching negotiation mechanisms between base stations in accurate switching stages based on QoS flow granularity, and mainly include two cases, where the case is one: rejecting by the target base station; case two: and the target base station accepts.
Specifically, for the first case, as shown in fig. 2, a source base station performs handover decision according to a measurement report reported by a terminal, and sends a handover request message to a target base station when the source base station determines to handover the terminal to the target base station, and the target base station sends a handover reject message to the source base station when determining that no DRB satisfies the requirement after receiving the handover request message.
Wherein, no DRB meets the requirement, specifically, no non-Guaranteed Bit Rate (non-GBR) class DRB meets the requirement.
Preferably, the handover request message sent by the source base station further includes at least one of the following information:
identification information QFI of the quality of service flow;
reflecting quality of service flow (reflective QoS flow) and configuration information of radio data bearer mapping (DRB);
and configuration information of uplink quality of service flow (UL QoS flow) and radio data bearer (DRB) mapping.
Specifically, for the second case, as shown in fig. 3, the source base station performs handover decision according to the measurement report reported by the terminal, and sends a handover request message to the target base station when the source base station determines to handover the terminal to the target base station, and the target base station sends a handover request acknowledgement message to the source base station when determining that a DRB meeting the conditions exists after receiving the handover request message.
Preferably, the handover request acknowledgement message may directly carry the second mapping relationship between the qos flow of the target base station and the radio data bearer, or may carry other information to indicate the second mapping relationship. In a specific application, if the second mapping relationship is the same as the first mapping relationship, the second mapping relationship or the indication information indicating the second mapping relationship may not be carried in the handover request acknowledgement message, and after the source base station receives the handover request acknowledgement message, if the handover request acknowledgement message does not carry information related to the second mapping relationship, the default target base station uses the same mapping relationship as the source base station.
Preferably, the handover request message sent by the source base station further includes at least one of the following information:
identification information QFI of the quality of service flow;
reflecting quality of service flow (reflective QoS flow) and configuration information of radio data bearer mapping (DRB);
and configuration information of uplink quality of service flow (UL QoS flow) and radio data bearer (DRB) mapping.
Correspondingly, the handover request acknowledgement message sent by the target base station further includes at least one of the following information:
reflecting quality of service flow (reflective QoS flow) and configuration information of radio data bearer mapping (DRB);
and configuration information of uplink quality of service flow (UL QoS flow) and radio data bearer (DRB) mapping.
Further, in order to implement lossless handover between base stations, an embodiment of the present invention further provides a data forwarding scheme between base stations, and specifically, the handover request message further includes:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
The embodiment of the invention provides three data forwarding schemes, which respectively comprise: the first scheme is a data forwarding scheme based on PDU session granularity; a second scheme is a data forwarding scheme based on DRB granularity; and a third scheme is a data forwarding scheme based on QoS flow granularity.
As shown in fig. 4, for scenario one: the target base station establishes a first data forwarding tunnel (GTP tunnel) by taking the PDU session as granularity; that is, in the case that the handover request message includes a PDU session based data forward proposal, the handover request confirm message further includes: the target base station distributes address information of a first data forwarding tunnel for the PDU session; each first data forwarding tunnel contains a plurality of QoS flows mapped to a plurality of DRBs.
Under this scheme, the method further comprises:
forwarding data packets to the target base station on the first data forwarding tunnel according to the address information of the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow. For example, each packet of the first data forwarding tunnel adds identification information of the quality of service flow (i.e., QoS flow ID information) at the header of the first data forwarding tunnel.
As shown in fig. 5, for scenario two: the target base station establishes a second data forwarding tunnel (GTP tunnel) with DRB as granularity, that is, in case that the handover request message includes a data forwarding proposal based on a radio data bearer, the handover request acknowledgement message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data; each second data forwarding tunnel contains a plurality of QoS flows.
Under the scheme, the identification information of the QoS Flow does not need to be additionally indicated, but the second mapping relation between the QoS Flow of the target base station and the radio bearer needs to be informed to the source base station through the switching request confirmation message.
As shown in fig. 6, for scenario three: and the target base station establishes a third data forwarding tunnel by taking the QoS flow as granularity, and each QoS flow establishes a third data forwarding tunnel. I.e. in case the handover request message comprises a quality of service flow based data forwarding proposal, the handover request acknowledge message further comprises: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow. The scheme also does not need additional identification information for indicating the QoS Flow.
Furthermore, the embodiment of the invention also provides corresponding lossless switching modes according to various mapping conditions of QoS flows of the source base station and the target base station to the DRB.
Further, in the above embodiment of the present invention, the method further includes:
and after receiving a switching request confirmation message sent by the target base station, sending a switching command for indicating the terminal to switch to the target base station to the terminal, and sending a Serial Number (SN) state report to the target base station.
After receiving a switching request confirmation message sent by a target base station, a source base station sends a switching command indicating that the terminal is switched to the target base station to the terminal, and sends a serial number SN status report to the target base station according to a first mapping relation and a second mapping relation, wherein the SN status report carries the SN of a protocol data unit PDU to be transmitted next.
On one hand, as shown in fig. 7, when the first mapping relationship is the same as the second mapping relationship and data forwarding between the source base station and the target base station is based on a PDU session, a SN status report of a sequence number is sent to the target base station, where the SN status report carries an SN of a PDU to be transmitted next;
or, as shown in fig. 7, when the first mapping relationship is the same as the second mapping relationship, and the data forwarding of the source base station and the target base station is based on a service data unit SDU, sending a serial number SN status report to the target base station, where the SN status report carries an SN of a next PDU to be transmitted and identification information of a quality of service stream corresponding to the SN of the next PDU to be transmitted.
On the other hand, under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the source base station are overlapped, the SNs are redistributed for the PDUs contained in at least one wireless data bearer of the source base station, so that the SNs of the PDUs contained in different wireless data bearers of the source base station are not overlapped;
and sending a sequence number SN status report to the target base station, wherein the SN status report carries the SN after the next PDU to be transmitted is reallocated and the reallocation information of the SN.
As shown in fig. 8, this situation is suitable for a scenario where different QoS flows of a source base station are mapped to different DRBs, and a target base station is mapped to the same DRB, and in this scenario, there is a possibility that SNs already allocated to different DRBs of the source base station are duplicated, which may result in data loss. The source base station reallocates the allocated SN, e.g., source PDU 2-destination PDU5, source PDU 3-destination PDU6, the corresponding information needs to be conveyed in the SN status report.
The redistribution information of the SNs may specifically be: the principle of reallocation of SNs, the correspondence of SNs after reallocation to source SNs, etc., for example, as shown in fig. 8, the SN number of the SN number PDU allocated by QoS Flow2 starts from the last SN number +1 of QoS Flow 1.
In short, the target base station can determine the corresponding relationship between the source SN and the SN of the target base station according to the redistribution information of the SNs, thereby realizing the continuity of data transmission and avoiding the loss of data.
On the other hand, when the first mapping relation is different from the second mapping relation and the SNs of the PDUs included in different radio data bearers of the target base station are discontinuous, a SN status report of the sequence number is sent to the target base station, where the SN status report carries the SN of the next PDU to be transmitted of the different radio data bearers of the target base station. As shown in fig. 9, the SN status report contains the following: the SN of the next PDU of DRB 1; and the SN of the next PDU of DRB 2.
As shown in fig. 9, this situation is applicable to a scenario where different QoS flows of base stations are mapped to the same DRB, and different QoSFlow of target base stations are mapped to different DRBs, and in this scenario, there may be a problem that an SN number inside a DRB of a target base station is not continuous, and since a terminal does not know whether a Packet with a discontinuous SN number is lost or another DRB transmission is allocated, a PDCP (Packet Data Convergence Protocol) status report at a terminal side may be triggered, and at this time, the target base station can determine that the Packet is transmitted by another DRB, and no additional operation is needed.
In summary, the embodiments of the present invention provide a manner that the source base station interacts with the target base station through an interface between base stations in a handover preparation phase, a lossless handover manner under multiple mapping conditions that QoS flows from the source base station and the target base station to the DRB, and a data forwarding manner based on PDU session, DRB and QoS flow granularity between the source base station and the target base station, so as to solve the problem of lossless handover from QoS flows from the source base station and the target base station to the base stations with different mappings in the 5G system.
As shown in fig. 10, an embodiment of the present invention further provides a handover control method, applied to a target base station, including:
step 101, receiving a handover request message sent by a source base station, wherein the handover request message carries a first mapping relation between a service quality flow of the source base station and a wireless data bearer;
step 102, sending a switching request confirmation message to the source base station, or sending a switching refusing message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
In the above embodiment of the present invention, step 101 and step 102 are switching negotiation mechanisms between base stations in accurate switching stages based on QoS flow granularity, and mainly include two cases, where the case is one: rejecting by the target base station; case two: and the target base station accepts.
Specifically, for the first case, as shown in fig. 2, a source base station performs handover decision according to a measurement report reported by a terminal, and sends a handover request message to a target base station when the source base station determines to handover the terminal to the target base station, and the target base station sends a handover reject message to the source base station when determining that no DRB satisfies the requirement after receiving the handover request message.
Wherein, no DRB meets the requirement, specifically, no non-Guaranteed Bit Rate (non-GBR) class DRB meets the requirement.
Preferably, the handover request message sent by the source base station further includes at least one of the following information:
identification information QFI of the quality of service flow;
reflecting quality of service flow (reflective QoS flow) and configuration information of radio data bearer mapping (DRB);
and configuration information of uplink quality of service flow (UL QoS flow) and radio data bearer (DRB) mapping.
Specifically, for the second case, as shown in fig. 3, the source base station performs handover decision according to the measurement report reported by the terminal, and sends a handover request message to the target base station when the source base station determines to handover the terminal to the target base station, and the target base station sends a handover request acknowledgement message to the source base station when determining that a DRB meeting the conditions exists after receiving the handover request message.
Preferably, the handover request acknowledgement message may directly carry the second mapping relationship between the qos flow of the target base station and the radio data bearer, or may carry other information to indicate the second mapping relationship. In a specific application, if the second mapping relationship is the same as the first mapping relationship, the second mapping relationship or the indication information indicating the second mapping relationship may not be carried in the handover request acknowledgement message, and after the source base station receives the handover request acknowledgement message, if the handover request acknowledgement message does not carry information related to the second mapping relationship, the default target base station uses the same mapping relationship as the source base station.
Preferably, the handover request message sent by the source base station further includes at least one of the following information:
identification information QFI of the quality of service flow;
reflecting quality of service flow (reflective QoS flow) and configuration information of radio data bearer mapping (DRB);
and configuration information of uplink quality of service flow (UL QoS flow) and radio data bearer (DRB) mapping.
Correspondingly, the handover request acknowledgement message sent by the target base station further includes at least one of the following information:
reflecting quality of service flow (reflective QoS flow) and configuration information of radio data bearer mapping (DRB);
and configuration information of uplink quality of service flow (UL QoS flow) and radio data bearer (DRB) mapping.
Further, in order to implement lossless handover between base stations, an embodiment of the present invention further provides a data forwarding scheme between base stations, and specifically, the handover request message further includes:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
The embodiment of the invention provides three data forwarding schemes, which respectively comprise: the first scheme is a data forwarding scheme based on PDU session granularity; a second scheme is a data forwarding scheme based on DRB granularity; and a third scheme is a data forwarding scheme based on QoS flow granularity.
As shown in fig. 4, for scenario one: the target base station establishes a first data forwarding tunnel (GTP tunnel) by taking the PDU session as granularity; that is, in the case that the handover request message includes a PDU session based data forward proposal, the handover request confirm message further includes: the target base station distributes address information of a first data forwarding tunnel for the PDU session; each first data forwarding tunnel contains a plurality of QoS flows mapped to a plurality of DRBs.
Under this scheme, the method further comprises:
and receiving data packets forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow. For example, each data packet of the first data forwarding tunnel adds identification information (i.e., QoS flowID information) of a quality of service flow to the header of the first data forwarding tunnel.
As shown in fig. 5, for scenario two: the target base station establishes a second data forwarding tunnel (GTP tunnel) with DRB as granularity, that is, in case that the handover request message includes a data forwarding proposal based on a radio data bearer, the handover request acknowledgement message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data; each second data forwarding tunnel contains a plurality of QoS flows.
Under the scheme, the identification information of the QoS Flow does not need to be additionally indicated, but the second mapping relation between the QoS Flow of the target base station and the radio bearer needs to be informed to the source base station through the switching request confirmation message.
As shown in fig. 6, for scenario three: and the target base station establishes a third data forwarding tunnel by taking the QoS flow as granularity, and each QoS flow establishes a third data forwarding tunnel. I.e. in case the handover request message comprises a quality of service flow based data forwarding proposal, the handover request acknowledge message further comprises: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow. The scheme also does not need additional identification information for indicating the QoS Flow.
Further, the method further comprises:
and after a switching request confirmation message is sent to the source base station, receiving a serial number SN status report sent by the source base station.
In summary, the embodiments of the present invention provide a method for interacting between the source base station and the target base station through an interface between the base stations in a handover preparation phase and a data forwarding method based on PDU session, DRB and QoS flow granularity for the source base station and the target base station, so as to solve the problem of lossless handover from QoS flow to QoS flow of the source base station and the target base station in a 5G system with different mappings.
As shown in fig. 11, an embodiment of the present invention further provides a handover control apparatus, applied to a source base station, including:
a request sending module 111, configured to send a handover request message to a target base station, where the handover request message carries a first mapping relationship between a qos flow of a source base station and a radio data bearer;
a receiving module 112, configured to receive a handover request acknowledgement message sent by a target base station, or receive a handover reject message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
In summary, the embodiments of the present invention provide a manner that the source base station interacts with the target base station through an interface between base stations in a handover preparation phase, a lossless handover manner under multiple mapping conditions that QoS flows from the source base station and the target base station to the DRB, and a data forwarding manner based on PDU session, DRB and QoS flow granularity between the source base station and the target base station, so as to solve the problem of lossless handover from QoS flows from the source base station and the target base station to the base stations with different mappings in the 5G system.
It should be noted that the switching control apparatus provided in the embodiments of the present invention is an apparatus capable of executing the switching control method, and all embodiments of the switching control method are applicable to the apparatus and can achieve the same or similar beneficial effects.
As shown in fig. 12, an embodiment of the present invention further provides a base station, which includes a processor 1200 and a transceiver 1210, where the base station is a source base station to which a terminal currently accesses, and the processor 1200 is configured to control the transceiver 1210 to perform the following processes:
sending a switching request message to a target base station, wherein the switching request message carries a first mapping relation between a service quality flow of a source base station and a wireless data bearer;
receiving a switching request confirmation message sent by a target base station, or receiving a switching refusing message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
Preferably, in the above embodiment of the present invention, the handover request message further includes at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
Preferably, in the above embodiment of the present invention, the handover request message further includes:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
Preferably, in the above embodiment of the present invention, in a case that the handover request message includes a PDU session based data forwarding proposal, the handover request acknowledge message further includes: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the processor 1200 is further configured to:
forwarding data packets to the target base station on the first data forwarding tunnel according to the address information of the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
Preferably, in the above embodiment of the present invention, in a case that the handover request message includes a data forwarding proposal based on a wireless data bearer, the handover request acknowledge message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
Preferably, in the above embodiments of the present invention, the processor 1200 is further configured to:
and after receiving a switching request confirmation message sent by the target base station, sending a switching command for indicating the terminal to switch to the target base station to the terminal, and sending a Serial Number (SN) state report to the target base station.
Preferably, in the above embodiments of the present invention, the transceiver 1210 is further configured to:
sending a SN state report of a serial number to a target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forward transmission of the source base station and the target base station is based on PDU conversation, wherein the SN state report carries the SN of the next PDU to be transmitted;
and sending a Serial Number (SN) status report to the target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forwarding of the source base station and the target base station is based on a Service Data Unit (SDU), wherein the SN status report carries the SN of the next PDU to be transmitted and the identification information of the service quality flow corresponding to the SN of the next PDU to be transmitted.
Preferably, in the above embodiments of the present invention, the processor 1200 is further configured to:
under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the source base station are duplicated, redistributing the SNs for the PDUs contained in at least one wireless data bearer of the source base station so that the SNs of the PDUs contained in different wireless data bearers of the source base station are not duplicated;
and sending a sequence number SN status report to the target base station, wherein the SN status report carries the SN after the next PDU to be transmitted is reallocated and the reallocation information of the SN.
Preferably, in the above embodiments of the present invention, the transceiver 1210 is further configured to:
and sending a SN state report of a serial number to the target base station under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the target base station are discontinuous, wherein the SN state report carries the SN of the next PDU to be transmitted carried by different wireless data bearers of the target base station.
In summary, the embodiments of the present invention provide a manner that the source base station interacts with the target base station through an interface between base stations in a handover preparation phase, a lossless handover manner under multiple mapping conditions that QoS flows from the source base station and the target base station to the DRB, and a data forwarding manner based on PDU session, DRB and QoS flow granularity between the source base station and the target base station, so as to solve the problem of lossless handover from QoS flows from the source base station and the target base station to the base stations with different mappings in the 5G system.
It should be noted that, the base station provided in the embodiments of the present invention is a base station capable of executing the handover control method, and all embodiments of the handover control method are applicable to the base station and can achieve the same or similar beneficial effects.
As shown in fig. 13, an embodiment of the present invention further provides a handover control apparatus, applied to a target base station, including:
a request receiving module 131, configured to receive a handover request message sent by a source base station, where the handover request message carries a first mapping relationship between a quality of service flow of the source base station and a radio data bearer;
a sending module 132, configured to send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
In summary, the embodiments of the present invention provide a method for interacting between the source base station and the target base station through an interface between the base stations in a handover preparation phase and a data forwarding method based on PDU session, DRB and QoS flow granularity for the source base station and the target base station, so as to solve the problem of lossless handover from QoS flow to QoS flow of the source base station and the target base station in a 5G system with different mappings.
It should be noted that the switching control apparatus provided in the embodiments of the present invention is an apparatus capable of executing the switching control method, and all embodiments of the switching control method are applicable to the apparatus and can achieve the same or similar beneficial effects.
As shown in fig. 12, an embodiment of the present invention further provides a base station, including a processor 1200 and a transceiver 1210, where the base station is a target base station to which a terminal is to be handed over, and the processor 1200 is configured to control the transceiver 1210 to perform the following processes:
receiving a switching request message sent by a source base station, wherein the switching request message carries a first mapping relation between a service quality flow of the source base station and a wireless data bearer;
sending a switching request confirmation message to the source base station, or sending a switching refusing message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
Preferably, in the above embodiment of the present invention, the handover request message further includes at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
Preferably, in the above embodiment of the present invention, the handover request message further includes:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
Preferably, in the above embodiment of the present invention, in a case that the handover request message includes a PDU session based data forwarding proposal, the handover request acknowledge message further includes: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the processor 1200 is further configured to:
and receiving data packets forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
Preferably, in the above embodiment of the present invention, in a case that the handover request message includes a data forwarding proposal based on a wireless data bearer, the handover request acknowledge message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
Preferably, in the above embodiments of the present invention, the transceiver 1210 is further configured to:
and after a switching request confirmation message is sent to the source base station, receiving a serial number SN status report sent by the source base station.
In summary, the embodiments of the present invention provide a method for interacting between the source base station and the target base station through an interface between the base stations in a handover preparation phase and a data forwarding method based on PDU session, DRB and QoS flow granularity for the source base station and the target base station, so as to solve the problem of lossless handover from QoS flow to QoS flow of the source base station and the target base station in a 5G system with different mappings.
It should be noted that, the base station provided in the embodiments of the present invention is a base station capable of executing the handover control method, and all embodiments of the handover control method are applicable to the base station and can achieve the same or similar beneficial effects.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements each process in the foregoing embodiment of the handover control method, and can achieve the same technical effect, and for avoiding repetition, details are not described here again. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block or blocks.
These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (33)

1. A switching control method is applied to a source base station, and is characterized by comprising the following steps:
sending a switching request message to a target base station, wherein the switching request message carries a first mapping relation between a service quality flow of a source base station and a wireless data bearer;
receiving a switching request confirmation message sent by a target base station, or receiving a switching refusing message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
2. The method of claim 1, wherein the handover request message further comprises at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
3. The method of claim 1, wherein the handover request message further comprises:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
4. The method of claim 3, wherein in the case that the handover request message includes a PDU session based data forward proposal, the handover request acknowledge message further comprises: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the method further comprises the following steps:
forwarding data packets to the target base station on the first data forwarding tunnel according to the address information of the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
5. The method of claim 3,
in a case where the handover request message includes a data forward proposal based on a wireless data bearer, the handover request confirm message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
6. The method of claim 1, further comprising:
and after receiving a switching request confirmation message sent by the target base station, sending a switching command for indicating the terminal to switch to the target base station to the terminal, and sending a Serial Number (SN) state report to the target base station.
7. The method of claim 6, wherein sending a SN status report to a target BS comprises:
sending a SN state report of a serial number to a target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forward transmission of the source base station and the target base station is based on PDU conversation, wherein the SN state report carries the SN of the next PDU to be transmitted;
and sending a Serial Number (SN) status report to the target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forwarding of the source base station and the target base station is based on a Service Data Unit (SDU), wherein the SN status report carries the SN of the next PDU to be transmitted and the identification information of the service quality flow corresponding to the SN of the next PDU to be transmitted.
8. The method of claim 6, wherein sending a SN status report to a target BS comprises:
under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the source base station are duplicated, redistributing the SNs for the PDUs contained in at least one wireless data bearer of the source base station so that the SNs of the PDUs contained in different wireless data bearers of the source base station are not duplicated;
and sending a sequence number SN status report to the target base station, wherein the SN status report carries the SN after the next PDU to be transmitted is reallocated and the reallocation information of the SN.
9. The method of claim 6, wherein sending a SN status report to a target BS comprises:
and sending a SN state report of a serial number to the target base station under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the target base station are discontinuous, wherein the SN state report carries the SN of the next PDU to be transmitted carried by different wireless data bearers of the target base station.
10. A handover control method applied to a target base station is characterized by comprising the following steps:
receiving a switching request message sent by a source base station, wherein the switching request message carries a first mapping relation between a service quality flow of the source base station and a wireless data bearer;
sending a switching request confirmation message to the source base station, or sending a switching refusing message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
11. The method of claim 10, wherein the handover request message further comprises at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
12. The method of claim 10, wherein the handover request message further comprises:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
13. The method of claim 12, wherein in the case that the handover request message includes a PDU session based data forward proposal, the handover request acknowledge message further comprises: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the method further comprises the following steps:
and receiving data packets forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
14. The method of claim 12,
in a case where the handover request message includes a data forward proposal based on a wireless data bearer, the handover request confirm message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
15. The method of claim 10, further comprising:
and after a switching request confirmation message is sent to the source base station, receiving a serial number SN status report sent by the source base station.
16. A handover control apparatus applied to a source base station, comprising:
a request sending module, configured to send a handover request message to a target base station, where the handover request message carries a first mapping relationship between a quality of service flow of a source base station and a radio data bearer;
a receiving module, configured to receive a handover request acknowledgement message sent by a target base station, or receive a handover rejection message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
17. A base station, comprising a processor and a transceiver, wherein the base station is a source base station to which a terminal is currently connected, and wherein the processor is configured to control the transceiver to perform the following processes:
sending a switching request message to a target base station, wherein the switching request message carries a first mapping relation between a service quality flow of a source base station and a wireless data bearer;
receiving a switching request confirmation message sent by a target base station, or receiving a switching refusing message sent by the target base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
18. The base station of claim 17, wherein the handover request message further comprises at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
19. The base station of claim 17, wherein the handover request message further comprises:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
20. The base station of claim 19, wherein in the case that the handover request message includes a PDU session based data forward proposal, the handover request acknowledge message further comprises: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the processor is further configured to:
forwarding data packets to the target base station on the first data forwarding tunnel according to the address information of the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
21. The base station of claim 19,
in a case where the handover request message includes a data forward proposal based on a wireless data bearer, the handover request confirm message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
22. The base station of claim 17, wherein the processor is further configured to:
and after receiving a switching request confirmation message sent by the target base station, sending a switching command for indicating the terminal to switch to the target base station to the terminal, and sending a Serial Number (SN) state report to the target base station.
23. The base station of claim 22, wherein the transceiver is further configured to:
sending a SN state report of a serial number to a target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forward transmission of the source base station and the target base station is based on PDU conversation, wherein the SN state report carries the SN of the next PDU to be transmitted;
and sending a Serial Number (SN) status report to the target base station under the condition that the first mapping relation is the same as the second mapping relation and the data forwarding of the source base station and the target base station is based on a Service Data Unit (SDU), wherein the SN status report carries the SN of the next PDU to be transmitted and the identification information of the service quality flow corresponding to the SN of the next PDU to be transmitted.
24. The base station of claim 22, wherein the processor is further configured to:
under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the source base station are duplicated, redistributing the SNs for the PDUs contained in at least one wireless data bearer of the source base station so that the SNs of the PDUs contained in different wireless data bearers of the source base station are not duplicated;
and sending a sequence number SN status report to the target base station, wherein the SN status report carries the SN after the next PDU to be transmitted is reallocated and the reallocation information of the SN.
25. The base station of claim 22, wherein the transceiver is further configured to:
and sending a SN state report of a serial number to the target base station under the condition that the first mapping relation is different from the second mapping relation and the SNs of the PDUs contained in different wireless data bearers of the target base station are discontinuous, wherein the SN state report carries the SN of the next PDU to be transmitted carried by different wireless data bearers of the target base station.
26. A handover control apparatus applied to a target base station, comprising:
a request receiving module, configured to receive a handover request message sent by a source base station, where the handover request message carries a first mapping relationship between a quality of service flow of the source base station and a radio data bearer;
a sending module, configured to send a handover request acknowledgement message to the source base station, or send a handover rejection message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
27. A base station comprising a processor and a transceiver, wherein the base station is a target base station to which a terminal is to be handed over, and wherein the processor is configured to control the transceiver to perform the following process:
receiving a switching request message sent by a source base station, wherein the switching request message carries a first mapping relation between a service quality flow of the source base station and a wireless data bearer;
sending a switching request confirmation message to the source base station, or sending a switching refusing message to the source base station; the switching request confirmation message carries first indication information of the first mapping relation between the service quality flow used by the target base station and the wireless data bearer or carries second indication information used for indicating a second mapping relation between the service quality flow of the target base station and the wireless data bearer; the handover reject message is used to indicate that the target base station does not have a radio data bearer capable of meeting the handover requirement.
28. The base station of claim 27, wherein the handover request message further comprises at least one of the following information:
identification information of the quality of service flow;
reflecting configuration information of the service quality flow and the wireless data bearing mapping;
and configuration information of mapping between the uplink service quality flow and the wireless data bearer.
29. The base station of claim 27, wherein the handover request message further comprises:
a data forwarding proposal based on PDU session; or,
a data forwarding proposal based on the wireless data bearer; or,
data forwarding proposal based on quality of service flow.
30. The base station of claim 29, wherein in the case that the handover request message includes a PDU session based data forward proposal, the handover request acknowledge message further comprises: the target base station distributes address information of a first data forwarding tunnel for the PDU session;
the processor is further configured to:
and receiving data packets forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.
31. The base station of claim 29,
in a case where the handover request message includes a data forward proposal based on a wireless data bearer, the handover request confirm message further includes: the target base station bears the address information of the distributed second data forwarding tunnel for the wireless data;
in a case where the handover request message includes a quality of service flow based data forward proposal, the handover request confirm message further includes: and the target base station distributes the address information of the third data forwarding tunnel for the service quality flow.
32. The base station of claim 27, wherein the transceiver is further configured to:
and after a switching request confirmation message is sent to the source base station, receiving a serial number SN status report sent by the source base station.
33. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the steps in the handover control method according to any one of claims 1 to 9;
alternatively, the program realizes the steps in the handover control method according to any one of claims 10 to 15 when executed by a processor.
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