WO2021227509A1

WO2021227509A1 - Base station switching apparatus and method, base station, source base station, and storage medium

Info

Publication number: WO2021227509A1
Application number: PCT/CN2020/139324
Authority: WO
Inventors: 吴伟锋
Original assignee: 京信网络系统股份有限公司
Priority date: 2020-05-12
Filing date: 2020-12-25
Publication date: 2021-11-18
Also published as: CN111586780B; CN111586780A

Abstract

The present application relates to a base station switching apparatus and method, a base station, a source base station, and a storage medium. The base station switching apparatus comprises a data plane processing unit; and the data plane processing unit comprises a SDAP data processing unit, a PDCP protocol processing unit, and an NGU data processing unit. When the current base station mode is SA mode and the current data switching type is DRB data switching, the SDAP data processing unit, according to a preset mapping, copies a first terminator so as to transmit same to each DRB to be switched; when confirmed that each DRB to be switched has received the first terminator, the PDCP protocol processing unit generates a second terminator so as to transmit same to the NGU data processing unit; and the NGU data processing unit closes a data switching tunnel corresponding to the second terminator. As described the present application can effectively improve switching delays and packet loss rate indicators, and enhance system stability.

Description

Base station switching device, method, base station, source base station and storage medium

Technical field

This application relates to the field of wireless communication technologies, and in particular to a base station switching device, method, base station, source base station, and storage medium.

Background technique

In a wireless system, when a terminal moves from one cell to another cell, in order to continuously provide services to the terminal, it is necessary to complete the cell handover. How to improve the performance index of handover has become an important performance index to improve user experience.

In the implementation process, the inventor found that the traditional technology has at least the following problems: the traditional technology related to handover, for the scene of handover between cells in the base station, cannot be extended to other application scenarios; at the same time, the delay and loss of the traditional technology handover There is still room for optimization in indicators such as packet rate, which is not conducive to system stability.

Summary of the invention

Based on this, it is necessary to provide a base station switching device, method, base station, source base station, and storage medium that can optimize data switching in response to the above technical problems.

In order to achieve the foregoing objective, on the one hand, an embodiment of the present invention provides a base station switching device, including a data plane processing unit; the data plane processing unit includes an SDAP data processing unit, a PDCP protocol processing unit, and an NGU data processing unit;

According to the switching instruction, the SDAP data processing unit monitors the session when the current base station mode is SA mode and the current data switching type is DRB data switching; and when it monitors that the first terminator is received in the session, according to the preset mapping relationship , Copy the first terminator to transmit to each DRB to be switched; the preset mapping relationship includes the mapping relationship between QoS flow and DRB;

When the PDCP protocol processing unit confirms that each DRB to be switched has received the first terminator, it generates a second terminator and transmits it to the NGU data processing unit;

The NGU data processing unit closes the data switching tunnel corresponding to the second terminator.

In one of the embodiments, when the current base station mode is NSA mode:

The NGU data processing unit transmits the downlink data to the SDAP data processing unit;

The PDCP protocol processing unit transmits the uplink data to the SDAP data processing unit;

The SDAP data processing unit transparently transmits the received downlink data and uplink data;

The PDCP protocol processing unit also performs data switching on the transparently transmitted downlink data, and when receiving a terminator, ends the data switching channel corresponding to the DRB.

In one of the embodiments,

According to the switching instruction, when the current base station mode is SA mode and the current data switching type is QoS stream data switching, the NGU data processing unit stops sending NGU downlink data if it receives a data switching message and sends it to the SDAP data processing unit in the session Send the third terminator;

When the SDAP data processing unit receives the third terminator, according to the preset mapping relationship, copy the third terminator for transmission to each DRB to be switched;

The PDCP protocol processing unit performs data switching on the data in the buffer and the PDCP receiving queue, and transmits the switched data to the first downlink data switching channel until the fourth terminator is received, and the fourth terminator is forwarded to the first downlink data switching channel. One downlink data forwarding channel;

The SDAP data processing unit obtains the switched data in the first downlink data switching channel and performs packet header disassembly, and transmits the disassembled data to the second downlink data switching channel until the fifth terminator is received, and The fifth terminator is forwarded to the second downlink data forwarding channel;

The NGU data processing unit acquires and processes the disassembled data in the second downlink data switching channel, and transmits the processed data to the data switching tunnel until the sixth terminator is received; and processes the data in the normal NGU tunnel, Until the seventh terminator is received, and the seventh terminator is transmitted to the data switching tunnel.

In one of the embodiments,

The PDCP protocol processing unit performs PDCP header disassembly and data switching on the data packets carrying the SN in the buffer, and performs data switching on the data packets that do not carry the SN in the PDCP receiving queue to obtain the switched data.

In one of the embodiments,

The first downlink data switching channel is a PDCP-SDAP data switching channel; the first downlink data forwarding channel is a PDCP-SDAP data forwarding channel;

The second downlink data switching channel is the SDAP-NGU data switching channel; the first downlink data forwarding channel is the SDAP-NGU data forwarding channel.

In one of the embodiments, the data plane processing unit further includes a message processing unit;

The message processing unit receives and processes the control plane switching message, and respectively transmits corresponding switching instructions to the NGU data processing unit, the SDAP data processing unit and the PDCP protocol processing unit to establish corresponding data switching tunnels and data switching channels.

A base station handover method includes the steps:

A base station, the base station includes a control plane processing unit, and the above-mentioned base station switching device;

The control panel processing unit transmits a handover message to the data plane processing unit; the handover message contains the handover information of the corresponding UE.

A source base station, the source base station includes a control plane processing unit, and the above-mentioned base station switching device;

A computer-readable storage medium on which a computer program is stored, and the computer program is executed by a processor to realize the steps of the above method.

One of the above technical solutions has the following advantages and beneficial effects:

This application proposes to send multiple copies of the End Marker (terminator) of the session to each mapped DRB (Data Radio Bearer) bearer in SA mode, thereby unifying NSA data switching and SA mode DRB data switching deal with. This application can be applied to all handover scenarios, including intra-base station cell handover and inter-base station cell handover. Compared with the traditional technology, this application can better reduce the packet loss during the handover, thereby increasing the rate during the handover, and at the same time better Optimized the handover delay and reduced the time-consuming of the whole handover. Above, this application can effectively improve the handover delay and packet loss rate indicators, and enhance system stability.

Description of the drawings

By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present application will become more apparent:

Fig. 1 is a structural block diagram of a base station handover device in an embodiment;

Figure 2 is a structural block diagram of a base station handover device in another embodiment;

Figure 3 is a schematic flowchart of a base station handover method in an embodiment;

Figure 4 is an internal unit of a base station or a source base station in an embodiment;

Figure 5 is a schematic diagram of a base station handover flow in an embodiment.

Detailed ways

In order to make the purpose, technical solutions, and advantages of this application clearer and clearer, the following further describes the application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and do not limit the application.

The traditional handover techniques include optimizing the transmission of End Marker (terminator) for the scene of inter-cell handover in the base station; and optimizing the end marker packet loss during the handover process; and also including the communication between the base stations. The process and the signaling process between the base station and the UE (User Equipment) are optimized; and the overall process of the handover signaling and data process does not involve the internal details of the base station.

However, the optimization between cells in the base station has not been extended to other application scenarios, and only in this case is the handover delay optimized by actively constructing an End Marker, and no other methods are involved. For End Marker packet loss, the method of receiving timeout processing through a timer does not consider that this timer can reduce the time in other cases. As for the overall signaling between base stations, the signaling process between the base station and the UE, or the optimization of the overall data process, the details of the internal process of the base station are not involved, and the internal message process and data process of the base station are not carefully optimized. There is still room for optimization that has not been involved. .

The traditional technology has optimized the subdivision scenarios for the handover scenarios between the cells in the base station, while this application subdivides the data of NSA (Non-Standalone, non-independent networking) and SA (Standalone, independent networking) for all scenarios. The switching process has been optimized. Traditional technologies have optimized the scenarios of abnormal End Marker packet loss, but this application performs the specific transmission process of the two data switching of QoS (Quality of Service) flow and DRB (Data Radio Bearer, data resource bearer).了Optimized. In the traditional technology, the handover process is optimized for the signaling process, but this application mainly optimizes the handover delay and packet loss indicators around the data switching and sending process.

Compared with the traditional technology, this application can better reduce the packet loss during the handover, thereby increasing the rate during the handover, especially for the data in the SA mode QoS flow switching. For PDCP (Packet Data Convergence Protocol, packet data convergence layer) Protocol)/SDAP (Service Data Adaptation Protocol)/GTPU (General Packet Radio Service Tunneling Protocol for User, GPRS Tunnel User Plane Protocol) three layers of data are all forwarded. Compared with the traditional technology, this application better optimizes the handover delay and reduces the time consumption of the entire handover. Compared with the traditional technology, this application considers the SA DRB data switching and QoS flow switching more, and the common points between the NSA data switching, unifies the implementation of the three, and the solution has a higher degree of reuse. Above, this application covers NSA and SA handover, as well as DRB switching and QoS flow switching for SA handover, which can effectively improve the handover delay and packet loss rate indicators, and enhance system stability.

This application can be applied to all handover scenarios, including intra-base station cell handover and inter-base station cell handover. At the same time, this application can be applied to base stations of all standards, and empirical application of this application can be obtained through UE log analysis of base station behavior.

In one embodiment, as shown in FIG. 1, a base station switching device is provided. The device is applied to a base station or a source base station as an example for description, including a data plane processing unit 100; the data plane processing unit includes a SDAP data processing unit 110. The PDCP protocol processing unit 120 and the NGU data processing unit 130;

According to the switching instruction, the SDAP data processing unit 110 monitors the session when the current base station mode is SA mode and the current data switching type is DRB data switching; and when it monitors that the first terminator is received in the session, it monitors the session according to the preset mapping Relationship, copy the first terminator to transmit to each DRB to be switched; the preset mapping relationship includes the mapping relationship between QoS flow and DRB;

When the PDCP protocol processing unit 120 confirms that each DRB to be switched has received the first terminator, it generates a second terminator and transmits it to the NGU data processing unit 130;

The NGU (NG User Plane, that is, NG-U, user plane interface) data processing unit 130 closes the data switching tunnel corresponding to the second terminator.

Specifically, the data plane processing unit 100 may be responsible for protocol processing and handover data switching processing on the network side and the air interface side data plane in the source base station. Correspondingly, the control plane processing unit may be responsible for processing signaling messages in the base station and controlling the protocol layer in the source base station.

The control plane processing unit in this application sends a message to notify the data plane processing unit of the handover information of the corresponding UE. The data plane processing unit 100 processes the switching message, and informs the NGU data processing unit 130 (i.e. NGU data processing unit 130), the SDAP data processing unit (i.e. SDAP data processing unit 110), and the PDCP protocol processing unit (i.e. PDCP) through internal messages. The protocol processing unit 120) establishes a corresponding handover tunnel and internal channel, and changes the state of the corresponding UE to a handover state.

In a specific example, this application proposes to prioritize whether the base station mode is SA mode or NSA mode, and further determine whether the data switching (that is, the data switching type) is DRB switching or QoS flow switching, and then data switching can be performed for different application scenarios. The process is optimized.

Specifically, this application optimizes the data switching process of subdividing NSA and SA for all scenarios, and can optimize the specific sending process of QoS flow and DRB data switching at the same time.

Among them, when the base station is DRB data switching in SA mode, the SDAP data processing unit 110 can monitor the End Marker in the session, and if it receives the End Marker, it sends a copy of the End Marker to each device according to the mapping relationship between the QoS flow and the DRB. One DRB. It should be noted that the general End Marker in this application may be a special data packet, which represents the end of the data sent to the source side. Furthermore, the first terminator, the second terminator, the third terminator, and the seventh terminator in this application all refer to End Marker, and they are only named according to the sequence of the process in which they appear, so as to facilitate the distinction. .

This application proposes to construct an End Marker in the base station itself, and can be used in 5G SA handover; specifically, multiple copies of the End Marker sent by the core network for a tunnel or session are used to control the data bearer data switching process. Further, this application multiplexes the data switching process of NSA and SA by receiving multiple copies of End Marker for each tunnel or session and sending them to the mapped data bearer.

Further, the PDCP protocol processing unit 120 confirms that the SA mode DRB switching is currently performed, and after all DRBs that need to be switched have received the End Marker, an End Marker is formed and sent to the NGU data processing unit 130.

The NGU data processing unit 130 receives the End Marker of the corresponding tunnel, and closes the corresponding tunnel.

In one of the embodiments, when the current base station mode is NSA mode:

The NGU data processing unit 130 transmits the downlink data to the SDAP data processing unit 110;

The PDCP protocol processing unit 120 transmits the uplink data to the SDAP data processing unit 110;

The SDAP data processing unit 110 transparently transmits the received downlink data and uplink data;

The PDCP protocol processing unit 120 also performs data switching on the transparently transmitted downlink data, and when receiving the terminator, ends the data switching channel corresponding to the DRB.

Specifically, when switching to NSA switching, for downlink data, the NGU data processing unit 130 still sends the data to the SDAP data processing unit 110. For uplink data, the PDCP protocol processing unit 120 still sends the data to the SDAP data processing unit 110.

The SDAP data processing unit 110 transparently transmits the received data in the NSA mode. No need to deal with End Marker. The PDCP protocol processing unit 120 generally controls the entire data switching process. After the downlink data is processed by the NGU data processing unit 130 and the SDAP data processing unit 110, the PDCP protocol processing unit 120 is responsible for controlling the data switching.

Further, when receiving End Marker, the PDCP protocol processing unit 120 ends the data switching channel corresponding to the DRB.

Above, this application still includes the SDAP layer in NSA mode, but adopts a one-to-one mapping method and data transparent transmission; and in SA mode, multiple copies of the End Marker of the session are sent to each mapped DRB bearer , To unify NSA data switching and SA mode DRB data switching processing. This application can be applied to all handover scenarios, including intra-base station cell handover and inter-base station cell handover. Compared with the traditional technology, this application can better reduce the packet loss during the handover, thereby increasing the rate during the handover, and at the same time better Optimized the handover delay and reduced the time-consuming of the whole handover. Above, this application can effectively improve the handover delay and packet loss rate indicators, and enhance system stability.

In one embodiment, as shown in FIG. 2, a base station switching device is provided. The device is applied to a base station or a source base station as an example for description, including a data plane processing unit 100; the data plane processing unit includes a SDAP data processing unit 110. The PDCP protocol processing unit 120 and the NGU data processing unit 130;

The NGU data processing unit 130 closes the data switching tunnel corresponding to the second terminator.

In a specific embodiment, the data plane processing unit 100 further includes a message processing unit 140;

The message processing unit 140 receives and processes the control plane switching message, and transmits corresponding switching instructions to the NGU data processing unit 130, the SDAP data processing unit 110, and the PDCP protocol processing unit 120 to establish corresponding data switching tunnels and data switching channels.

Specifically, the control plane processing unit in this application sends a message to notify the data plane processing unit 100 of the handover information of the corresponding UE. The message processing unit 140 in the data plane processing unit 100 processes the handover message, and informs the NGU data processing unit 130 (that is, the NGU data processing unit 130), the SDAP data processing unit (that is, the SDAP data processing unit 110), and the PDCP through internal messages. The protocol processing unit (ie, the PDCP protocol processing unit 120) establishes a corresponding handover tunnel and internal channel, and changes the state of the corresponding UE to a handover state.

In a specific embodiment, the NGU data processing unit 130 stops sending NGU downlink data if it receives a data switching message when the current base station mode is SA mode and the current data switching type is QoS flow data switching according to the switching instruction. , And send a third terminator to the session of the SDAP data processing unit 110; wherein, the data switching message is transmitted by the message processing unit 140 to the NGU data processing unit 130;

When the SDAP data processing unit 110 receives the third terminator, according to the preset mapping relationship, copy the third terminator to transmit to each DRB to be switched;

The PDCP protocol processing unit 120 performs data switching on the data in the buffer and the PDCP receiving queue, and transmits the switched data to the first downlink data switching channel until the fourth terminator is received, and the fourth terminator is forwarded to The first downlink data forwarding channel;

The SDAP data processing unit 110 obtains the switched data in the first downlink data switching channel and performs packet header disassembly, and transmits the disassembled data to the second downlink data switching channel until the fifth terminator is received, and Forward the fifth terminator to the second downlink data forwarding channel;

The NGU data processing unit 130 acquires and processes the disassembled data in the second downlink data switching channel, and transmits the processed data to the data switching tunnel until the sixth terminator is received; and processes the data in the normal NGU tunnel Until the seventh terminator is received, and the seventh terminator is transmitted to the data switching tunnel.

Specifically, when it is confirmed that the current base station mode is SA mode and the current data switching type is QoS stream data switching, the message processing unit 140 instructs the NGU data processing unit 130 through a message to first stop sending of NGU downlink data, and then to the SDAP session Send an End Marker.

When the base station mode is SA mode and the data is switched to QoS flow switching, the SDAP data processing unit 110 monitors the End Marker in the session. If it receives the End Marker, it sends a copy of the End Marker to the DRB according to the mapping relationship between the QoS flow and the DRB. One copy for each DRB.

The PDCP protocol processing unit 120 first processes the data with SN in the buffer, strips the PDCP header, and processes the data with SN, and then processes the data in the PDCP receiving queue until the End Marker is received. The data and End Marker are sent to the SDAP data processing unit 110 through the internal downlink switching channel.

The SDAP data processing unit 110 fetches data from the downlink switching channel, strips the SDAP header, and passes through the downlink switching channel with the NGU until the End Marker ends, and the End Marker is concurrently sent to the downlink switching channel of SDAP and GTPU (ie, the NGU data processing unit 130) .

The NGU data processing unit 130 processes the data in the downlink forwarding channel with the SDAP until the End Marker in the downlink forwarding channel is received, and the End Marker is not forwarded.

The NGU data processing unit 130 processes the data in the normal tunnel and forwards it through the forwarding tunnel until it receives the End Marker of the normal tunnel. The NGU data processing unit 130 forwards this End Marker to the switching tunnel.

In a specific embodiment, the PDCP protocol processing unit 120 performs PDCP header disassembly and data switching on the data packet carrying SN in the buffer, and performs data switching on the data packet that does not carry SN in the PDCP receiving queue, to obtain the switched data packet. data.

In a specific embodiment, the first downlink data switching channel is a PDCP-SDAP data switching channel; the first downlink data forwarding channel is a PDCP-SDAP data forwarding channel;

Specifically, this application proposes that for SA mode QoS flow data switching, after receiving a handover control message from the control plane, the NGU downlink data transmission is first stopped after receiving the control plane handover control message, and an End Marker is assembled to send it to the SDAP downlink data queue. The first step is to disassemble the packet header of the PDCP data packet with SN (Serial Number), perform data switching, and send it to the PDCP-SDAP data switching channel; then perform data switching on the data packet without adding SN in the PDCP receiving queue, and send it. Switch the channel for PDCP-SDAP data until the End Marker is received, and forward this End Marker to the PDCP-SDAP data forwarding channel. In the second step, the data and End Marker in the normal SDAP queue are all sent to PDCP and processed by PDCP. Then the SDAP layer processes the data of the PDCP-SDAP data switching channel, disassembles the packet header, and forwards it to the SDAP-NGU data switching channel. Until the End Marker of the PDCP-SDAP data switching channel is received, the End Marker is forwarded to the SDAP-NGU data forwarding channel. In the third step, the NGU data processing unit first processes the data in the SDAP-NGU data switching channel and sends it to the data switching tunnel until the End Marker is received in SDAP-NGU; it does not forward the End Marker received in SDAP-NGU; then Next, the data in the normal tunnel of the NGU data processing unit is processed until the End Marker in the normal tunnel is received, and the End Marker is forwarded to the switching tunnel.

As mentioned above, compared with the traditional technology, this application reduces the packet loss during the handover better, thereby increasing the rate during the handover, especially for the data in the SA mode QoS flow switching, and for the PDCP/SDAP/NGU three-layer data All have been forwarded. Compared with the traditional technology, this application better optimizes the handover delay and reduces the time consumption of the entire handover. Compared with the traditional technology, this application considers the SA DRB data switching and QoS flow switching more, and the common points between the NSA data switching, unifies the implementation of the three, and the solution has a higher degree of reuse. Above, this application covers NSA and SA handover, as well as DRB switching and QoS flow switching for SA handover, which can effectively improve the handover delay and packet loss rate indicators, and enhance system stability.

In an embodiment, as shown in FIG. 1, a base station handover method is provided. The method is applied to a base station or a source base station as an example for description, including the steps:

In step S310, the SDAP data processing unit monitors the session according to the switching instruction when the current base station mode is SA mode and the current data switching type is DRB data switching; and when it monitors that the first terminator is received in the session, according to the preset Set the mapping relationship, copy the first terminator to transmit to each DRB to be switched; the preset mapping relationship includes the mapping relationship between QoS flow and DRB;

Step S320: When the PDCP protocol processing unit confirms that each DRB to be switched has received the first terminator, it generates a second terminator and transmits it to the NGU data processing unit;

Step S330, the NGU data processing unit closes the data switching tunnel corresponding to the second terminator.

Further, compared with the traditional technology which is mainly optimized for the handover between cells in the base station, the optimization of this application can be applied to all scenarios; compared with the traditional technology for the optimization of End Marker packet loss during the handover process , This application optimizes the message coordination process and data transmission process in the base station; compared with the traditional technology, it optimizes the signaling process between the base station and the signaling process between the base station and the UE. This application optimizes The message coordination process in the base station and the data transmission process during the handover. Compared with the traditional technology, which mainly involves the overall signaling and data flow of handover, this application relates to the message coordination in the base station and optimizes the detailed flow of data.

It should be noted that the specific limitation on the base station handover method may refer to the above limitation on the base station handover device, which will not be repeated here. Each step in the above-mentioned base station switching device may be implemented in whole or in part by software, hardware, and a combination thereof. The above-mentioned units may be embedded in the form of hardware or independent of the processor in the computer equipment, or may be stored in the memory of the computer equipment in the form of software, so that the processor can call and execute the operations corresponding to the above-mentioned units.

It should be understood that although the various steps in the flowcharts of FIG. 3 and FIG. 5 are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless specifically stated in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least part of the steps in Figure 3 and Figure 5 may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. These sub-steps or The execution order of the stages is not necessarily carried out sequentially, but may be executed alternately or alternately with other steps or at least a part of other steps or sub-steps or stages.

In one embodiment, the present application provides a base station, which includes a control plane processing unit and the aforementioned base station handover device;

In one embodiment, the present application provides a source base station, the source base station includes a control plane processing unit, and the aforementioned base station switching device;

Specifically, as shown in FIG. 4, the base station or source base station of the present application may include:

The data plane processing unit 100 is responsible for protocol processing and handover data switching processing on the network side and the air interface side data plane in the source base station.

The control plane processing unit 200 is responsible for processing signaling messages in the base station and controlling the protocol layer in the source base station.

Wherein, the data plane processing unit 100 may include:

The SDAP data processing unit 110 is responsible for SDAP protocol processing and SDAP layer switching data switching processing.

The PDCP protocol processing unit 120: is responsible for the PDCP protocol processing of the base station and the PDCP layer handover data switching processing.

The NGU data processing unit 130 is responsible for processing according to the NGU protocol of the base station and switching data of the NGU layer.

The message processing unit 140 is responsible for processing messages from the control plane and sending internal control messages.

Further, as shown in FIG. 5, based on the above-mentioned base station or source base station, this application provides a method for implementing base station handover, which may include the following steps:

201: The control plane processing unit 200 sends a message to notify the data plane processing unit of the switching information of the corresponding UE.

202: The data plane processing unit 100 processes the handover message, and informs the NGU data processing unit and the SDAP data processing unit through internal messages. The PDCP protocol processing unit establishes a corresponding handover tunnel and internal channel, and changes the state of the corresponding UE to a handover state.

203: Judge whether the base station mode is SA mode or NSA mode, NSA mode jumps to 205, and SA mode jumps to 204.

204: Judge whether data switching is DRB switching or QoS flow switching, jump to 205 for DRB switching, and jump to 211 for QoS flow switching.

205: When the base station is DRB data switching in SA mode, the SDAP data processing unit monitors the End Marker in the session. If it receives the End Marker, it sends a copy of the End Marker to each DRB according to the mapping relationship between the QoS flow and the DRB. One serving.

206: When switching to NSA switching, for downlink data, the NGU data processing unit still sends the data to the SDAP data processing unit. For uplink data, the PDCP protocol processing unit still sends the data to the SDAP data processing unit.

207: The SDAP data processing unit transparently transmits the received data in the NSA mode. No need to deal with End Marker.

208: The PDCP protocol processing unit generally controls the entire data switching process. After the downlink data is processed by the NGU data processing unit and the SDAP data processing unit, the PDCP protocol processing unit is responsible for controlling the data switching.

209: When receiving the End Marker, the PDCP protocol processing unit ends the data switching channel corresponding to the DRB. In the case of SA mode DRB switching, after all DRBs that need to be switched have received the End Marker, an End Marker is formed and sent to the NGU data processing unit.

210: The NGU data processing unit receives the End Marker of the corresponding tunnel and closes the corresponding tunnel.

211: The message processing unit instructs the NGU data processing unit through a message to first stop sending the NGU downlink data, and send an End Marker to the SDAP session.

212: When the base station is in SA mode and the data is switched to QoS flow switching, the SDAP data processing unit monitors the End Marker in the session. If it receives the End Marker, it sends a copy of the End Marker to the DRB according to the mapping relationship between the QoS flow and the DRB. One copy for each DRB.

213: The PDCP protocol processing unit first processes the data with SN in the buffer, strips off the PDCP header, and processes the data with SN, and then processes the data in the PDCP receiving queue until the End Marker is received. The data and End Marker are sent to SDAP through the internal downlink switching channel.

214: The SDAP data processing unit fetches data from the downlink switching channel, strips the SDAP header, and passes through the downlink switching channel with the NGU until the End Marker ends, and the End Marker is concurrently sent to the downlink switching channels of SDAP and NGU.

215: The NGU data processing unit processes the data in the downlink forwarding channel with the SDAP until the End Marker in the downlink forwarding channel ends, and the End Marker is not forwarded.

216: The NGU data processing unit processes the data in the normal tunnel and forwards it through the forwarding tunnel until it receives the End Marker of the normal tunnel. The NGU data processing unit forwards this End Marker to the switching tunnel.

Those skilled in the art can understand that the structure shown in FIG. 4 is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the device on which the solution of the present application should be applied. The specific device may include a diagram More or fewer components are shown in, or some components are combined, or have different component arrangements.

In one embodiment, a computer-readable storage medium is provided, and a computer program is stored thereon, and the computer program implements the steps of any one of the foregoing methods when the computer program is executed by a processor.

A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage. In the medium, when the computer program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and/or volatile memory. Non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not a limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Channel (Synchlink) DRAM (SLDRAM), memory bus type dynamic random access memory (Rambus DRAM, RDRAM for short), and interface dynamic random access memory (DRDRAM), etc.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A base station switching device, characterized in that it includes a data plane processing unit; the data plane processing unit includes an SDAP data processing unit, a PDCP protocol processing unit, and an NGU data processing unit;

The SDAP data processing unit monitors the session according to the switching instruction when the current base station mode is SA mode and the current data switching type is DRB data switching; and when it monitors that the first terminator is received in the session, according to Preset mapping relationship, copy the first terminator to transmit to each DRB to be switched; the preset mapping relationship includes the mapping relationship between QoS flow and DRB;

When the PDCP protocol processing unit confirms that each DRB to be switched has received the first terminator, it generates a second terminator and transmits it to the NGU data processing unit;

The NGU data processing unit closes the data switching tunnel corresponding to the second terminator.
The base station switching device according to claim 1, wherein when the current base station mode is NSA mode:

The NGU data processing unit transmits downlink data to the SDAP data processing unit;

The PDCP protocol processing unit transmits uplink data to the SDAP data processing unit;

The SDAP data processing unit transparently transmits the received downlink data and the uplink data;

The PDCP protocol processing unit also performs data switching on the transparently transmitted downlink data, and when a terminator is received, ends the data switching channel corresponding to the DRB.
The base station switching device according to claim 1, wherein:

According to the switching instruction, when the current base station mode is SA mode and the current data switching type is QoS stream data switching, the NGU data processing unit stops sending NGU downlink data if it receives a data switching message and sends it to the SDAP data processing unit. Send the third terminator in the session;

When the SDAP data processing unit receives the third terminator, according to the preset mapping relationship, copy the third terminator for transmission to each DRB to be switched;

The PDCP protocol processing unit performs data switching on the data in the buffer and the PDCP receiving queue, and transmits the switched data to the first downlink data switching channel until the fourth terminator is received, and the fourth is terminated. The symbol is forwarded to the first downlink data forwarding channel;

The SDAP data processing unit obtains the switched data in the first downlink data switching channel and performs packet header disassembly, and transmits the disassembled data to the second downlink data switching channel until the first downlink data switching channel is received. Five terminator, and forward the fifth terminator to the second downlink data forwarding channel;

The NGU data processing unit acquires and processes the disassembled data in the second downlink data switching channel, and transmits the processed data to the data switching tunnel until a sixth terminator is received; and processes the NGU The data in the normal tunnel until the seventh terminator is received, and the seventh terminator is transmitted to the data switching tunnel.
The base station switching device according to claim 3, wherein:

The PDCP protocol processing unit performs PDCP header disassembly and data switching on the data packets carrying SN in the buffer, and performs data switching on the data packets that do not carry SN in the PDCP receiving queue, to obtain the switched data .
The base station switching device according to claim 3, wherein:

The first downlink data switching channel is a PDCP-SDAP data switching channel; the first downlink data forwarding channel is a PDCP-SDAP data forwarding channel;

The second downlink data switching channel is a SDAP-NGU data switching channel; the first downlink data forwarding channel is a SDAP-NGU data forwarding channel.
The base station handover device according to any one of claims 1 to 5, wherein the data plane processing unit further comprises a message processing unit;

The message processing unit receives and processes the control plane switching message, and transmits corresponding switching instructions to the NGU data processing unit, the SDAP data processing unit, and the PDCP protocol processing unit, respectively, to establish corresponding data switching tunnels and data Switch the channel.
A base station handover method is characterized in that it comprises the steps:

According to the switching instruction, the SDAP data processing unit monitors the session when the current base station mode is SA mode and the current data switching type is DRB data switching; and when it monitors that the first terminator is received in the session, it monitors the session according to the preset Mapping relationship, copying the first terminator to transmit to each DRB to be switched; the preset mapping relationship includes the mapping relationship between QoS flow and DRB;

When the PDCP protocol processing unit confirms that each DRB to be switched has received the first terminator, it generates a second terminator and transmits it to the NGU data processing unit;

The NGU data processing unit closes the data switching tunnel corresponding to the second terminator.
A base station, wherein the base station includes a control plane processing unit, and the base station handover device according to any one of claims 1 to 6;

The control panel processing unit transmits a handover message to the data plane processing unit; the handover message includes the handover information of the corresponding UE.
A source base station, wherein the source base station includes a control plane processing unit, and the base station handover device according to any one of claims 1 to 6;

The control panel processing unit transmits a handover message to the data plane processing unit; the handover message includes the handover information of the corresponding UE.
A computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the method according to claim 7 when the computer program is executed by a processor.