CN110062418B - Air interface switching method and node equipment - Google Patents

Air interface switching method and node equipment Download PDF

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Publication number
CN110062418B
CN110062418B CN201810048114.1A CN201810048114A CN110062418B CN 110062418 B CN110062418 B CN 110062418B CN 201810048114 A CN201810048114 A CN 201810048114A CN 110062418 B CN110062418 B CN 110062418B
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layer
data packet
air interface
sdap
link
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CN110062418A (en
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孙军帅
王莹莹
黄学艳
韩星宇
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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
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Abstract

The invention provides an air interface switching method and node equipment. The switching method is applied to a Service Data Adaptation Protocol (SDAP) layer and comprises the following steps: when the user terminal performs air interface switching, the user terminal performs data interaction with a packet data convergence protocol PDCP layer to realize the reestablishment of the data packet on different low-layer links. The method obtains the information of the data packet to be reestablished from the PDCP layer by carrying out data interaction with the PDCP layer of the lower layer link, realizes the reestablishment of the data packet on different lower layer links at the SDAP layer, can ensure the seamless lossless reestablishment of the data on different lower layer links, and avoids the problems that the prior art causes data loss when the UE is switched over at an air interface and can not realize the seamless lossless switching of the data.

Description

Air interface switching method and node equipment
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to an air interface switching method and a node device.
Background
In 5G, a Service Data Adaptation Protocol (SDAP) layer is introduced. Specifically, the SDAP sublayer may map a Quality of Service (QoS) Data stream onto a Data Radio Bearer (DRB), where the QoS Data stream belongs to a Protocol Data Unit (PDU) Session, each user may have at least one PDU Session, and the QoS Data stream is transmitted by an NG for receiving an IP Data stream of a core network, and the QoS Data stream is for a user terminal (UE), and is unrelated to an air interface cell where the UE is located.
At present, a DRB is associated with an air interface cell where a UE is located, and when the UE switches over the air interface, a PDCP (Packet Data Convergence Protocol) sublayer and a Radio Link Control (RLC) sublayer of a lower Layer thereof are switched over, that is, a Radio Link Control (RLC)/MAC (Medium Access Control) (that is, medium Access Control)/PHY (Physical Layer). In the prior art, when the UE is switched over at an air interface, data is mainly switched over between PDCP protocol sublayers, which may cause data loss and may not realize seamless and lossless data switching.
Disclosure of Invention
The invention aims to provide an air interface switching method and node equipment, which are used for solving the problem that in the prior art, when UE is switched at an air interface, the seamless lossless switching of data can not be realized mainly through data switching between PDCP protocol sublayers.
The embodiment of the invention provides an air interface switching method, which is applied to a Service Data Adaptation Protocol (SDAP) layer and comprises the following steps:
when the user terminal performs air interface switching, the user terminal performs data interaction with a packet data convergence protocol PDCP layer to realize the reestablishment of the data packet on different low-layer links.
Preferably, the air interface switching method further includes:
acquiring a current data packet transmitted to a PDCP layer, and caching the current data packet;
and sending the current data packet to a PDCP layer of a corresponding lower-layer link, wherein the current data packet carries the identification mark of the current data packet on the SDAP layer.
Preferably, the air interface switching method, wherein when the user terminal performs air interface switching, performing data interaction with a packet data convergence protocol PDCP layer, and implementing reestablishment of a data packet on different lower layer links includes:
when the user terminal performs air interface switching, acquiring an identity identification of data to be retransmitted on an SDAP layer from a PDCP layer of a source lower layer link;
determining a retransmission data packet needing to be retransmitted according to the identity identification mark;
and sending the retransmission data packet to a PDCP layer of a target lower layer link.
Preferably, the air interface switching method further includes:
receiving an air interface switching indication configured by Radio Resource Control (RRC) signaling;
determining that the user terminal performs air interface switching according to an air interface switching indication configured by the RRC signaling;
wherein, the step of obtaining the identification identifier of the data needing to be retransmitted at the SDAP layer from the PDCP layer of the source lower layer link comprises the following steps:
sending a request for retransmitting a data packet to the source lower link;
and receiving the identification identifier of the retransmission data packet in the SDAP layer, which is sent by the source lower layer link according to the retransmission data packet request.
Preferably, the air interface switching method further includes:
receiving an air interface switching indication sent by a PDCP layer of a source lower layer link;
in the step of acquiring the identification of the data to be retransmitted on the SDAP layer from the PDCP layer of the source lower link, the identification of the data packet to be retransmitted on the SDAP layer is acquired through the air interface switching indication.
Preferably, the air interface switching method, wherein the step of sending the retransmission data packet to a PDCP layer of a target lower link includes:
when the source low-layer link and the target low-layer link belong to the same SDAP layer, directly sending a retransmission data packet on the source low-layer link to the target low-layer link;
and when the source low-layer link and the target low-layer link belong to different SDAP layers, forwarding the retransmission data packet to a target SDAP layer of the target low-layer link.
Preferably, after the step of sending the current data packet to the PDCP layer of the corresponding lower link, the method further includes:
acquiring a notification message of successful sending of a data packet sent by a corresponding low-layer link, wherein the notification message comprises an identification identifier of the successfully sent data packet on an SDAP layer;
and releasing the corresponding data packet according to the identification mark of the successfully sent data packet in the SDAP layer, which is included in the notification message.
Preferably, in the air interface switching method, in the step of acquiring the current data packet to be transmitted to the PDCP layer in real time and caching the current data packet, the current data packet is sequentially stored according to a receiving sequence of the received current data packet.
Preferably, the air interface switching method further includes:
as a receiving end, receiving a data packet sent by a packet data convergence protocol PDCP layer;
sorting the received data packets;
and sending the data packets to an upper link according to the sequence of the sequenced data packets.
Preferably, in the air interface switching method, in the step of receiving the data packet sent by the packet data convergence protocol PDCP layer:
and when the received data packet has a repeated data packet of the target data packet, discarding the repeated data packet.
Preferably, in the air interface switching method, after the step of receiving the data packet sent by the packet data convergence protocol PDCP layer, the method further includes:
the received data packet is buffered.
Preferably, the air interface switching method further includes:
acquiring a data packet deletion indication sent by a PDCP layer of a lower link;
and deleting the cached data packet according to the indication.
The embodiment of the present invention further provides another air interface switching method, where the method is applied to a packet data convergence protocol PDCP layer, and the method includes:
when the user terminal switches the air interface, the user terminal performs data interaction with the SDAP layer, and the reestablishment of the data packet on different low-layer links is realized.
Preferably, the air interface switching method further includes:
and acquiring a current data packet sent by the SDAP layer in real time, wherein the current data packet comprises an identification mark of the current data packet on the SDAP layer.
Preferably, the air interface switching method, wherein when the user terminal performs air interface switching, performing data interaction with a packet data convergence protocol PDCP layer, and implementing switching of a data packet on different lower layer links includes:
and sending the identification mark of the data packet to be retransmitted on the SDAP layer to the PDCP layer, so that the PDCP layer determines the retransmitted data packet to be retransmitted according to the identification mark and sends the retransmitted data packet to the PDCP layer of the target low-layer link.
Preferably, the air interface switching method, wherein the step of sending the identification identifier of the data packet to be retransmitted on the SDAP layer to the PDCP layer includes:
receiving a request for retransmitting a data packet sent by a PDCP layer;
and sending the identification identifier of the retransmission data packet on the SDAP layer to the PDCP layer according to the retransmission data packet request.
Preferably, the air interface switching method, wherein the step of sending the identification identifier of the data packet to be retransmitted on the SDAP layer to the PDCP layer includes:
and sending an air interface switching indication to the PDCP layer, wherein the air interface switching indication comprises an identification mark of the data packet needing to be retransmitted on the SDAP layer.
Preferably, after the step of acquiring the current data packet sent by the SDAP layer in real time, the method further includes:
and sending a notification message of successful sending of the data packet to the SDAP layer, wherein the notification message comprises an identification identifier of the successfully sent data packet on the SDAP layer, so that the SDAP layer releases the corresponding data packet.
Preferably, the air interface switching method further includes:
when the PDCP layer is applied to a receiving end, the received data packets are sequentially sent to the SDAP layer according to the header information of the received data packets.
Preferably, the air interface switching method further includes:
and when the PDCP layer is applied to a receiving end, sending a data packet deleting instruction to the SDAP layer so that the SDAP layer deletes the cached data packet.
The embodiment of the present invention further provides a node device, which is applied to a service data adaptation protocol, SDAP, layer, and includes a transceiver, where the transceiver is configured to:
when the user terminal performs air interface switching, the user terminal performs data interaction with a packet data convergence protocol PDCP layer to realize the reestablishment of the data packet on different low-layer links.
Preferably, the node device, wherein the transceiver is further configured to:
acquiring a current data packet transmitted to a PDCP layer, and caching the current data packet;
and sending the current data packet to a PDCP layer of a corresponding lower-layer link, wherein the current data packet carries the identification mark of the current data packet on the SDAP layer.
Preferably, the node device, wherein the transceiver is specifically configured to:
when the user terminal performs air interface switching, acquiring an identity identification of data to be retransmitted on an SDAP layer from a PDCP layer of a source lower layer link;
determining a retransmission data packet to be retransmitted according to the identity identification mark;
and sending the retransmission data packet to a PDCP layer of a target lower layer link.
Preferably, the node device, wherein the transceiver is further configured to:
receiving an air interface switching indication configured by Radio Resource Control (RRC) signaling;
determining that the user terminal performs air interface switching according to an air interface switching indication configured by the RRC signaling;
wherein, when acquiring the identification identifier of the data to be retransmitted at the SDAP layer from the PDCP layer of the source lower link, the transceiver is specifically configured to:
sending a request for retransmitting a data packet to the source lower link;
and receiving the identification identifier of the retransmission data packet in the SDAP layer, which is sent by the source lower layer link according to the retransmission data packet request.
Preferably, the node device, wherein the transceiver is further configured to:
receiving an air interface switching instruction sent by a PDCP layer of a source lower layer link;
and when acquiring the identification identifier of the data to be retransmitted on the SDAP layer from the PDCP layer of the source lower layer link, the transceiver acquires the identification identifier of the data packet to be retransmitted on the SDAP layer through the empty port switching indication.
Preferably, the node device, when sending the retransmission packet to the PDCP layer of the target lower layer link, the transceiver is specifically configured to:
when the source low-layer link and the target low-layer link belong to the same SDAP layer, directly sending a retransmission data packet on the source low-layer link to the target low-layer link;
and when the source low-layer link and the target low-layer link belong to different SDAP layers, forwarding the retransmission data packet to a target SDAP layer of the target low-layer link.
Preferably, the node device, wherein the transceiver is further configured to:
acquiring a notification message of successful transmission of a data packet transmitted by a corresponding lower-layer link, wherein the notification message comprises an identification identifier of the successfully transmitted data packet on an SDAP layer;
and releasing the corresponding data packet according to the identification mark of the successfully sent data packet in the SDAP layer, which is included in the notification message.
Preferably, in the node device, when the transceiver acquires a current data packet that needs to be transmitted to the PDCP layer in real time and buffers the current data packet, the transceiver sequentially stores the current data packet according to a receiving sequence of the received current data packet.
Preferably, the node device, wherein the transceiver is further configured to:
as a receiving end, receiving a data packet sent by a packet data convergence protocol PDCP layer;
sorting the received data packets;
and sending the data packets to an upper link according to the sequence of the sequenced data packets.
Preferably, the node device, wherein the transceiver receives a data packet sent by a packet data convergence protocol PDCP layer, and discards a duplicate data packet of a target data packet when the received data packet is the duplicate data packet.
Preferably, the node device, wherein the node device further includes:
and the processor is used for buffering the received data packet after the transceiver receives the data packet sent by the packet data convergence protocol PDCP layer.
Preferably, the node device, wherein the processor is further configured to:
acquiring a data packet deletion indication sent by a PDCP layer of a lower link;
and deleting the cached data packet according to the indication.
The embodiment of the present invention further provides a node device, which is applied to a packet data convergence protocol PDCP layer, wherein the node device includes:
and the transceiver is used for carrying out data interaction with the SDAP layer when the user terminal carries out air interface switching, and realizing the reestablishment of the data packet on different low-level links.
Preferably, the node device, wherein the transceiver is further configured to:
and acquiring a current data packet sent by the SDAP layer in real time, wherein the current data packet comprises an identification mark of the current data packet on the SDAP layer.
Preferably, the node device, wherein the transceiver is specifically configured to:
and sending the identification mark of the data packet to be retransmitted on the SDAP layer to the PDCP layer, so that the PDCP layer determines the retransmitted data packet to be retransmitted according to the identification mark and sends the retransmitted data packet to the PDCP layer of the target lower-layer link.
Preferably, the node device, wherein the transceiver is specifically configured to:
receiving a request for retransmitting a data packet sent by a PDCP layer;
and sending the identification identifier of the retransmission data packet on the SDAP layer to the PDCP layer according to the retransmission data packet request.
Preferably, the node device, wherein the transceiver is specifically configured to:
and sending an air interface switching instruction to the PDCP layer, wherein the air interface switching instruction comprises an identification mark of the data packet needing to be retransmitted on the SDAP layer.
Preferably, the node device, wherein the transceiver is further configured to:
and sending a notification message of successful sending of the data packet to the SDAP layer, wherein the notification message comprises the identification identifier of the successfully sent data packet in the SDAP layer so as to release the corresponding data packet by the SDAP layer.
Preferably, the node device, wherein the transceiver is further configured to:
when the PDCP layer is applied to a receiving end, the received data packets are sequentially transmitted to the SDAP layer according to header information of the received data packets.
Preferably, the node device, wherein the transceiver is further configured to:
when the PDCP layer is applied to a receiving end, a data packet deleting instruction is sent to the SDAP layer, so that the SDAP layer deletes the cached data packet.
The embodiment of the invention also provides another node device, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor; the processor implements the air interface switching method according to any one of the above descriptions when executing the program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, where the computer program, when executed by a processor, implements the steps in the air interface switching method according to any one of the foregoing embodiments.
At least one of the above technical solutions of the present invention has the following beneficial effects:
the air interface switching method according to the specific embodiment of the present invention obtains information of a data packet that needs to be reestablished from a PDCP layer by performing data interaction with the PDCP layer of a lower link, and reestablishes the data packet on different lower links at an SDAP layer, thereby ensuring seamless lossless reestablishment of data on different lower links, and avoiding a problem that in the prior art, when UE is switched over an air interface, data is lost and seamless lossless switching of data cannot be achieved.
Drawings
Fig. 1 is a schematic flow chart of an air interface switching method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an air interface switching method according to a second embodiment of the present invention;
FIG. 3 is a detailed flowchart of step S230 in FIG. 2;
fig. 4 is a schematic structural diagram of a network architecture adopting the air interface switching method according to the embodiment of the present invention;
fig. 5 is a schematic flowchart of a specific air interface switching method according to a third embodiment of the present invention;
fig. 6 is a schematic diagram of a first implementation structure of a node device according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a second implementation structure of the node device according to the embodiment of the present invention;
fig. 8 is a schematic diagram of a third implementation structure of the node device according to the 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.
The air interface switching method according to the embodiment of the present invention utilizes the mapping function from the QoS data stream to the DRB of the SDAP layer to perform data interaction with the PDCP layer, thereby implementing the reestablishment (also referred to as switching) of the data packet on different lower layer links, and ensuring seamless lossless reestablishment of the data on different lower layer links.
Specifically, the air interface switching method according to the first embodiment of the present invention is applied to a service data adaptation protocol SDAP layer, and as shown in fig. 1, includes:
step S110, when the user terminal performs air interface switching, performs data interaction with the packet data convergence protocol PDCP layer, so as to reestablish the data packet on different lower layer links.
The air interface switching method according to the embodiment of the present invention obtains information of a data packet to be reestablished from a PDCP layer by performing data interaction with the PDCP layer of a lower link, and reestablishes the data packet on different lower links at an SDAP layer, thereby ensuring seamless and lossless reestablishment of data on different lower links, and avoiding a problem that data is lost and seamless and lossless switching of data cannot be achieved when UE is switched over an air interface in the prior art.
Further, the present invention provides an air interface switching method according to the second embodiment, which is applied to a service data adaptation protocol, SDAP, layer, and as shown in fig. 2, in the second embodiment, the air interface switching method includes:
s210, acquiring a current data packet transmitted to a PDCP layer, and caching the current data packet;
s220, sending a current data packet to a PDCP layer of a corresponding lower link, wherein the current data packet carries an identification mark of the current data packet on the SDAP layer;
and S230, when the user terminal performs air interface switching, performing data interaction with the packet data convergence protocol PDCP layer to realize the reestablishment of the data packet on different low-layer links.
By adopting the air interface switching method described in the second embodiment of the present invention, the SDAP layer has a function of buffering a data packet, buffers the received data packet of the QoS data stream, and sends an identification identifier for providing the data packet to the PDCP layer of the lower link, thereby providing a basis for data interaction with the PDCP layer.
Specifically, the identification may be an absolute address of the buffer when the data packet is buffered in the SDAP layer, or may be a relative address, for example, an offset value or an index value of the storage address.
In addition, preferably, in step S210, when the current data packet transmitted to the PDCP layer is acquired and the current data packet is buffered, the received current data packets are sequentially stored according to the receiving sequence of the received current data packet.
Based on the data packet caching function of the SDAP layer, specifically, with the air interface switching method according to the embodiment of the present invention, as shown in fig. 3, step S230 specifically includes:
s231, when the user terminal performs air interface switching, acquiring an identification identifier of data to be retransmitted on the SDAP layer from the PDCP layer of the source lower-layer link;
s232, determining a retransmission data packet to be retransmitted according to the identity identification mark;
s233, the retransmission packet is sent to the PDCP layer of the target lower link.
By adopting the above steps S231 to S233, a packet rollback mechanism and a packet relocation function during air interface switching are formed between the SDAP layer and the lower link, so that the SDAP layer can send the packet to the target lower link, thereby effectively ensuring seamless and lossless reestablishment of data on different lower links.
Specifically, with reference to the schematic structural diagram of the network architecture that employs the air interface switching method according to the embodiment of the present invention shown in fig. 4, with the air interface switching method according to the embodiment of the present invention, when the SDAP Layer serves as a sending end of a QoS data flow, a data packet of the QoS data flow is received from an Upper Layer link, the data packet of the QoS data flow is buffered in the SDAP Layer, and is mapped to a DRB (the mapping part function is specified in a protocol 37.234), and then the data packet of the QoS data flow is sent to a PDCP Layer of a lower Layer link.
By adopting the air interface switching method according to the embodiment of the present invention, according to the above steps S210 and S220, the SDAP layer carries the identification of the data packet on the SDAP layer on each data packet sent to the PDCP layer of the lower link.
Further, the lower Layer link sends a data packet to the Radio Interface Layer of the wireless Interface Layer, when the data packet is successfully sent on the lower Layer link, the lower Layer link sends a notification message that the data packet is successfully sent to the SDAP Layer through the obtained identification mark of the data packet on the SDAP Layer, wherein the notification message comprises the identification mark of the data packet which is successfully sent on the SDAP Layer; and then, the SDAP layer releases the corresponding cached data packet according to the identification mark of the successfully sent data packet in the SDAP layer, which is included in the notification message.
In addition, when the PDCP layer of the low-layer link feeds back the data packet to be retransmitted, the identification mark of the data packet to be retransmitted on the SDAP layer is sent to the SDAP layer, the SDAP layer determines the data packet to be retransmitted according to the identification mark, and the retransmitted data packet is sent to the PDCP layer of the target low-layer link.
By adopting the above mode, the identification mark transmitted between the SDAP layer and the PDCP layer of the lower link layer only needs to be used as interactive data between the SDAP layer and the PDCP layer of the lower link layer, and does not need to be transmitted to an air interface.
With reference to fig. 2, in this embodiment of the present invention, in step S230, the user terminal performs air interface switching, the SDAP layer performs data interaction with the PDCP layer, and triggering of reestablishment of the data packet on different lower layer links may be switched through radio resource control RRC signaling configuration or an air interface switching instruction sent by the PDCP layer. Specifically, when the air interface switching indication configured by the radio resource control RRC signaling is triggered, the user terminal is determined to perform air interface switching according to the air interface switching indication configured by the RRC signaling. The indication of air interface switching may be a Connection Reconfiguration signaling for RRC Connection reestablishment, where the signaling carries a switching configuration used for indicating reestablishment of a data packet on a lower link.
With reference to fig. 3, specifically, in the foregoing manner, in step S231, the step of obtaining, from the PDCP layer of the source lower link, the identification of the data to be retransmitted at the SDAP layer may include:
sending a request for retransmitting a data packet to a source lower link;
and receiving the identification mark of the retransmission data packet sent by the source lower-layer link according to the retransmission data packet request on the SDAP layer.
Through the above manner, the SDAP layer actively sends a request for retransmitting the data packet to the lower link, and after the lower link receives the request, the lower link sends the data packet information which is not successfully sent and needs to be retransmitted to the SDAP layer, so that the SDAP layer determines the data packet which needs to be retransmitted according to the received data packet information (namely, the identification mark of the data packet on the SDAP layer).
And when the SDAP layer is triggered to rebuild the data packet on the lower-layer link through the air interface switching instruction sent by the PDCP layer of the source lower-layer link, determining that the user terminal performs air interface switching according to the air interface switching instruction sent by the PDCP layer. Specifically, the air interface switching indication sent by the PDCP layer carries an identification of the data packet to be retransmitted on the SDAP layer.
Therefore, with reference to fig. 3, specifically, in the foregoing manner, in step S231, the step of obtaining, from the PDCP layer of the source lower link, the identification of the data to be retransmitted in the SDAP layer may include:
and acquiring the identity identification of the data packet to be retransmitted on the SDAP layer through an air interface switching instruction sent by the PDCP layer.
In the air interface switching method according to the specific embodiment of the present invention, the retransmission data packet to be retransmitted can be determined by one of the two manners. Thereafter, the received data packets are further sorted to preferentially transmit the data packets requiring retransmission.
Further, with reference to fig. 2, by using the method for switching an air interface according to the embodiment of the present invention, in step S233, the step of sending the retransmission packet to the PDCP layer of the target lower link may be:
when the source low-layer link and the target low-layer link belong to the same SDAP layer, directly sending the retransmission data packet on the source low-layer link to the target low-layer link;
and when the source low-layer link and the target low-layer link belong to different SDAP layers, forwarding the retransmission data packet to the target SDAP layer of the target low-layer link.
Specifically, when a source low-layer link and a target low-layer link belong to the same SDAP layer, that is, the SDAP layer served by the source low-layer link and the target low-layer link is not changed, a retransmission data packet is preferentially sent on the link, the retransmission data packet on the source low-layer link is directly sent to the target low-layer link, and after the retransmission data packet is sent, other data packets are sent again;
when the source lower link and the target lower link belong to different SDAPs, that is, when the SDAP layer served by the source lower link and the target lower link changes, the retransmitted data packet on the source lower link needs to be forwarded to the target SDAP layer of the target lower link first, and preferably, the target SDAP layer receives the retransmitted data packet, preferentially sends the retransmitted data packet, and then sends another data packet.
Specifically, when the above-mentioned SDAP layer needs to forward the retransmission packet to the target SDAP layer of the target lower link, it needs to add identification information for identifying the target SDAP layer that needs to be forwarded to the packet header of the packet.
By adopting the air interface switching method of the embodiment of the invention, each data packet sent by the SDAP layer to the lower link carries the identification mark on the SDAP layer, so that when the data packet is retransmitted, the identification mark to be retransmitted can be obtained from the lower link, and the data packet to be retransmitted is determined; and the data packets can be sequentially sent to the target low-level link according to the configuration of the switching signaling and the identity identification mark, so that the sequence correctness of the data packets in sending and receiving is ensured, and the seamless lossless reestablishment of the data on different low-level links is effectively ensured.
By using the air interface switching method according to the specific embodiment of the present invention, the SDAP layer serving as a sending end can send data packets to a target lower link in sequence, so as to ensure the sequence correctness when the data packets are sent and received, and the SDAP layer serving as a receiving end needs to ensure that the data packets can be transmitted to an upper link in sequence.
Specifically, when the SDAP layer serves as a receiving end, as shown in fig. 4, the SDAP layer receives a packet of a QoS data stream from the PDCP layer of the lower link and transmits the received packet to the upper link, and when the received packet has an SDAP header, transmits the packet to the upper link after removing the SDAP header.
When the air interface switching method according to the embodiment of the present invention is used as a receiving end, the SDAP layer receives a data packet sent by the PDCP layer of the target lower link, can sequence the received data, and sends the data packet to the upper link according to the sequence of the sequenced data packet.
Therefore, in the embodiment of the invention, the SDAP layer has a sequencing function when serving as the receiving end, so as to ensure that the data packets can be transmitted to the upper link in sequence.
Preferably, when the receiver is used, the SDAP layer further has a packet buffering function and a repeated reception identification function, and can perform interactive acknowledgement with the PDCP layer of the target lower link.
Specifically, when the SDAP layer is used as a receiving end, the SDAP layer can send the data packet to the upper link according to the header information (which may be a sequence number SN in the header information) of the received data packet, when it is determined that the data packet is received in sequence, according to the receiving sequence; when the data packets are judged not to be received according to the sequence, waiting for the sequence to receive the data packets and then sending the data packets to the upper link, and sending notification information of data packet loss to a PDCP layer of the lower link; further, the SDAP layer can delete the buffered data packets or retain the buffered data packets according to the indication sent by the PDCP layer of the lower link.
In addition, when the received data packet is cached, the SDAP layer can also confirm that the received data packet is overlapped with the target data packet, and can discard the overlapped data packet.
By adopting the air interface switching method of the embodiment of the invention, through the matching of the SDAP layer of the receiving end and the SDAP layer of the sending end, the seamless lossless switching of the SDAP can be realized, no influence is generated on the air interface, and the effect of reducing the data cache pressure of the PDCP is achieved.
An embodiment of the present invention provides an air interface switching method, which is applied to a packet data convergence protocol PDCP layer, and as shown in fig. 5, the method includes:
and S510, when the user terminal performs air interface switching, performing data interaction with a Service Data Adaptation Protocol (SDAP) layer, and realizing reestablishment of the data packet on different low-layer links.
The air interface switching method according to the embodiment of the present invention performs data interaction between the SDAP layer and the PDCP layer, and implements reestablishment of a data packet on different lower layer links at the SDAP layer, so as to ensure seamless and lossless reestablishment of data on different lower layer links, and avoid the problem that in the prior art, when UE is switched over an air interface, data is lost and seamless and lossless switching of data cannot be implemented.
Specifically, with reference to the schematic structural diagram of a network architecture that employs the air interface switching method according to the embodiment of the present invention shown in fig. 4, when the air interface switching method according to the embodiment of the present invention is applied to a transmitting end, a PDCP layer of a lower link receives a data packet of a QoS data stream from an SDAP layer.
Preferably, the method further comprises:
and acquiring a current data packet sent by the SDAP layer in real time, wherein the current data packet comprises an identification identifier of the current data packet on the SDAP layer.
Specifically, the SDAP layer has a packet buffering function, buffers a received packet of the QoS data stream, and sends an identification identifier of the packet to the PDCP layer of the lower link, so as to provide a basis for data interaction with the PDCP layer.
The identification mark may be an absolute address of the buffer memory when the data packet is buffered in the SDAP layer, or may be a relative address, for example, an offset value or an index value of the memory address.
Further, the method according to the embodiment of the present invention further includes:
and sending a notification message of successful sending of the data packet to the SDAP layer, wherein the notification message comprises an identification identifier of the successfully sent data packet on the SDAP layer, so that the SDAP layer releases the corresponding data packet.
By adopting the steps, the lower-Layer link sends a data packet to the Radio Interface Layer of the wireless Interface Layer, when the data packet is successfully sent on the lower-Layer link, the lower-Layer link sends a notification message that the data packet is successfully sent to the SDAP Layer through the obtained identification mark of the data packet on the SDAP Layer, wherein the notification message comprises the identification mark of the data packet which is successfully sent on the SDAP Layer; and then, the SDAP layer releases the corresponding cached data packet according to the identification mark of the successfully sent data packet in the SDAP layer, which is included in the notification message.
Based on the data packet caching function of the SDAP layer, with reference to fig. 5, the step S510 specifically includes:
and sending the identification mark of the data packet to be retransmitted on the SDAP layer to the SDAP layer, so that the SDAP layer determines the retransmitted data packet to be retransmitted according to the identification mark and sends the retransmitted data packet to the PDCP layer of the target low-layer link.
Specifically, one embodiment of the foregoing method for sending, to the SDAP layer, the identification identifier of the data packet to be retransmitted on the SDAP layer may include:
receiving a request for retransmitting a data packet sent by an SDAP layer;
and sending the identification identifier of the retransmission data packet on the SDAP layer to the SDAP layer according to the retransmission data packet request.
By adopting the above mode, the air interface switching indication is triggered by the RRC signaling, the SDAP layer actively sends a request for retransmitting the data packet to the lower link, and after receiving the request, the lower link sends the information of the data packet which is not successfully sent and needs to be retransmitted to the SDAP layer, so that the SDAP layer determines the data packet which needs to be retransmitted according to the received information of the data packet (i.e. the identification identifier of the data packet at the SDAP layer).
In addition, another embodiment of sending the identification identifier of the data packet needing to be retransmitted at the SDAP layer to the SDAP layer may include:
and sending an air interface switching instruction to the SDAP layer, wherein the air interface switching instruction comprises an identification mark of the data packet needing to be retransmitted on the SDAP layer.
Based on the above manner, the SDAP layer is triggered to reestablish the data packet on the lower link layer through the air interface switching instruction sent by the PDCP layer of the source lower link layer, and specifically, the air interface switching instruction sent by the PDCP layer carries the identification of the data packet to be retransmitted on the SDAP layer.
Further, in the method for switching an air interface according to the embodiment of the present invention, when the method is applied to a PDCP layer and used as a receiving end, the method preferably further includes:
and sending the received data packets to the SDAP layer in sequence according to the header information of the received data packets.
Specifically, the received data packets are sequentially sent to the SDAP layer according to the sequence number SN in the header information of the data packets.
The method further comprises the following steps: and sending a data packet deleting indication to the SDAP layer so that the SDAP layer deletes the buffered data packet.
By adopting the air interface switching method described in the embodiment of the present invention, data interaction is performed between the PDCP layer and the SDAP layer, so that the correctness of the sequence of the data packets during transmission and reception can be ensured, and the SDAP layer serving as a receiving end needs to ensure that the data packets can be transmitted to the upper link in sequence.
Another aspect of the specific embodiment of the present invention further provides a node device, which is applied to an SDAP layer, as shown in fig. 6, and includes a transceiver 610 and a processor 620, where the transceiver 640 is configured to:
when the user terminal performs air interface switching, the user terminal performs data interaction with a packet data convergence protocol PDCP layer to realize the reestablishment of the data packet on different low-layer links.
The node device according to the specific embodiment of the present invention performs data interaction with the PDCP layer of the lower link, obtains information of a data packet to be re-established from the PDCP layer, and re-establishes the data packet on different lower links on the SDAP layer, thereby ensuring seamless and lossless re-establishment of data on different lower links, and avoiding a problem that data is lost and seamless and lossless handover of data cannot be achieved when the UE is switched over an air interface in the prior art.
In an embodiment of the present invention, the transceiver 610 is further configured to:
acquiring a current data packet transmitted to a PDCP layer, and caching the current data packet;
and sending the current data packet to a PDCP layer of a corresponding lower-layer link, wherein the current data packet carries the identification mark of the current data packet on the SDAP layer.
By adopting the node equipment, the SDAP layer has a data packet caching function, caches the received data packet of the QoS data stream, sends the identification mark for providing the data packet to the PDCP layer of the lower link and provides a basis for data interaction with the PDCP layer.
In an embodiment of the present invention, the transceiver 610 is specifically configured to:
when the user terminal performs air interface switching, acquiring an identity identification of data to be retransmitted on an SDAP layer from a PDCP layer of a source lower layer link;
determining a retransmission data packet to be retransmitted according to the identity identification mark;
and sending the retransmission data packet to a PDCP layer of a target lower layer link.
Based on the above functions, a packet fallback mechanism and a packet relocation function during air interface handover are formed between the SDAP layer and the lower link, so that the SDAP layer can send a packet to a target lower link, thereby effectively ensuring seamless lossless reestablishment of data on different lower links.
In an aspect of this embodiment of the present invention, the transceiver 610 is further configured to:
receiving an air interface switching indication configured by Radio Resource Control (RRC) signaling;
determining that the user terminal performs air interface switching according to an air interface switching indication configured by the RRC signaling;
wherein, the transceiver 610, when acquiring the identification of the data needing to be retransmitted at the SDAP layer from the PDCP layer of the source lower layer link, is adapted to:
sending a request for retransmitting a data packet to the source lower link;
and receiving the identification identifier of the retransmission data packet in the SDAP layer, which is sent by the source lower layer link according to the retransmission data packet request.
By adopting the above mode, when the air interface switching indication configured by the radio resource control RRC signaling is triggered, the user terminal is determined to perform air interface switching according to the air interface switching indication configured by the RRC signaling. The SDAP layer actively sends a request for retransmitting the data packet to the lower link, and after receiving the request, the lower link sends the data packet information which is not successfully sent and needs to be retransmitted to the SDAP layer, so that the SDAP layer determines the data packet which needs to be retransmitted according to the received data packet information (namely, the identification mark of the data packet on the SDAP layer).
In another aspect of the specific embodiment of the present invention, the transceiver 610 is further configured to:
receiving an air interface switching instruction sent by a PDCP layer of a source lower layer link;
wherein, when acquiring the identification identifier of the data to be retransmitted on the SDAP layer from the PDCP layer of the source lower link, the transceiver 610 acquires the identification identifier of the data packet to be retransmitted on the SDAP layer through the null switching instruction.
Based on the above mode, the SDAP layer is triggered to reestablish the data packet on the lower link through the air interface switching indication sent by the PDCP layer of the source lower link, and the user terminal is determined to perform air interface switching according to the air interface switching indication sent by the PDCP layer. Specifically, the air interface switching indication sent by the PDCP layer carries the identification of the data packet to be retransmitted on the SDAP layer.
In addition, in an embodiment of the present invention, when the transceiver 610 sends the retransmission packet to the PDCP layer of the target lower layer link, it is specifically configured to:
when the source low-layer link and the target low-layer link belong to the same SDAP layer, directly sending the retransmission data packet on the source low-layer link to the target low-layer link;
and when the source low-layer link and the target low-layer link belong to different SDAP layers, forwarding the retransmission data packet to a target SDAP layer of the target low-layer link.
Specifically, when a source low-layer link and a target low-layer link belong to the same SDAP layer, that is, the SDAP layer served by the source low-layer link and the target low-layer link is not changed, a retransmission data packet is preferentially sent on the link, the retransmission data packet on the source low-layer link is directly sent to the target low-layer link, and after the retransmission data packet is sent, other data packets are sent again;
when the source lower link and the target lower link belong to different SDAPs, that is, when the SDAP layer served by the source lower link and the target lower link changes, the retransmitted data packet on the source lower link needs to be forwarded to the target SDAP layer of the target lower link first, and preferably, the target SDAP layer receives the retransmitted data packet, preferentially sends the retransmitted data packet, and then sends another data packet.
Specifically, when the above-mentioned SDAP layer needs to forward the retransmission packet to the target SDAP layer of the target lower link, it needs to add identification information for identifying the target SDAP layer that needs to be forwarded to the packet header of the packet.
In an embodiment of the present invention, the transceiver 610 is further configured to:
acquiring a notification message of successful transmission of a data packet transmitted by a corresponding lower-layer link, wherein the notification message comprises an identification identifier of the successfully transmitted data packet on an SDAP layer;
and releasing the corresponding data packet according to the identification mark of the successfully sent data packet in the SDAP layer, which is included in the notification message.
In addition, when the transceiver 610 acquires a current data packet that needs to be transmitted to the PDCP layer in real time and buffers the current data packet, the current data packet is sequentially stored according to a receiving sequence of the received current data packet.
By adopting the node device according to the specific embodiment of the present invention, the SDAP layer, as a transmitting end, can sequentially transmit data packets to a target lower-layer link, thereby ensuring the sequence correctness when the data packets are transmitted and received, and the SDAP layer, as a receiving end, needs to ensure that the data packets can be transmitted to an upper-layer link in sequence.
Specifically, the SDAP layer serves as a receiving end, and the transceiver 610 is further configured to:
receiving a data packet sent by a packet data convergence protocol PDCP layer;
sorting the received data packets;
and sending the data packets to an upper link according to the sequence of the sequenced data packets.
Preferably, the transceiver 610 receives a packet sent by the PDCP layer, and discards a duplicate packet of a target packet when the received packet is the duplicate packet.
Further, the node device further includes:
a processor 620, configured to buffer a received data packet after the transceiver 610 receives the data packet sent by the packet data convergence protocol PDCP layer.
In this embodiment of the present invention, the SDAP layer serves as a receiving end, and the processor 620 is further configured to:
acquiring a data packet deletion indication sent by a PDCP layer of a lower link;
and deleting the cached data packet according to the indication.
When the node device according to the embodiment of the present invention is used as a receiving end, the SDAP layer receives a data packet sent by the PDCP layer of the target lower link, can sequence the received data, and sends the data packet to the upper link according to the sequence of the sequenced data packet.
Therefore, in the embodiment of the invention, the SDAP layer has a sequencing function when serving as the receiving end, so as to ensure that the data packets can be transmitted to the upper link in sequence.
Specifically, when the SDAP layer is used as a receiving end, the SDAP layer can send the data packet to the upper link according to the receiving order when it is determined that the data packet is received in order; when the data packets are judged not to be received according to the sequence, waiting for the sequence to receive the data packets and then sending the data packets to the upper link, and sending notification information of data packet loss to a PDCP layer of the lower link; further, the SDAP layer can delete the buffered data packets or retain the buffered data packets according to the indication sent by the PDCP layer of the lower link.
The specific embodiment of the present invention further provides another node device, which is applied to a packet data convergence protocol PDCP layer, where as shown in fig. 7, the node device includes a transceiver 710:
the transceiver 710 is configured to perform data interaction with the SDAP layer when the user terminal performs air interface switching, so as to implement reestablishment of a data packet on different lower layer links.
The node device according to the specific embodiment of the present invention performs data interaction with the PDCP layer through the SDAP layer, and implements reestablishment of a data packet on different lower layer links at the SDAP layer, so as to ensure seamless and lossless reestablishment of data on different lower layer links, and avoid the problem that in the prior art, when UE is switched over at an air interface, data is lost and seamless and lossless switching of data cannot be implemented.
In this embodiment of the present invention, the transceiver 710 is further configured to:
and acquiring a current data packet sent by the SDAP layer in real time, wherein the current data packet comprises an identification mark of the current data packet on the SDAP layer.
Specifically, the SDAP layer has a function of buffering packets, buffers the received packets of the QoS data stream, and sends an identification identifier for providing the packets to the PDCP layer of the lower link, so as to provide a basis for data interaction with the PDCP layer.
Preferably, the transceiver 710 is specifically configured to:
and sending the identification mark of the data packet to be retransmitted on the SDAP layer to the SDAP layer, so that the SDAP layer determines the retransmitted data packet to be retransmitted according to the identification mark and sends the retransmitted data packet to the PDCP layer of the target low-layer link.
In addition, in one embodiment of the foregoing sending the identification identifier of the data packet to be retransmitted to the SDAP layer on the SDAP layer, the transceiver 710 is specifically configured to:
receiving a request for retransmitting a data packet sent by an SDAP layer;
and sending the identification identifier of the retransmission data packet on the SDAP layer to the SDAP layer according to the retransmission data packet request.
By adopting the above mode, the air interface switching indication is triggered by the RRC signaling, the SDAP layer actively sends a request for retransmitting the data packet to the lower link, and after receiving the request, the lower link sends the information of the data packet which is not successfully sent and needs to be retransmitted to the SDAP layer, so that the SDAP layer determines the data packet which needs to be retransmitted according to the received information of the data packet (i.e. the identification identifier of the data packet at the SDAP layer).
In addition, in another embodiment of the foregoing sending the identification identifier of the data packet to be retransmitted to the SDAP layer at the SDAP layer, the transceiver 710 is specifically configured to:
and sending an air interface switching instruction to the SDAP layer, wherein the air interface switching instruction comprises an identification mark of the data packet needing to be retransmitted on the SDAP layer.
Based on the above manner, the SDAP layer is triggered to reestablish the data packet on the lower link layer through the air interface switching instruction sent by the PDCP layer of the source lower link layer, and specifically, the air interface switching instruction sent by the PDCP layer carries the identification of the data packet to be retransmitted on the SDAP layer.
In an embodiment of the present invention, the transceiver 710 is further configured to:
and sending a notification message of successful sending of the data packet to the SDAP layer, wherein the notification message comprises an identification identifier of the successfully sent data packet on the SDAP layer, so that the SDAP layer releases the corresponding data packet.
Further, when the node device according to the embodiment of the present invention is applied to the PDCP layer and serves as a receiving end, the transceiver 710 is further configured to: when the PDCP layer is applied to a receiving end, the received data packets are sequentially transmitted to the SDAP layer according to header information of the received data packets.
Preferably, the transceiver 710 is further configured to:
when the PDCP layer is applied to a receiving end, a data packet deleting instruction is sent to the SDAP layer, so that the SDAP layer deletes the cached data packet.
By adopting the node device described in the embodiment of the present invention, the PDCP layer performs data interaction with the SDAP layer, so that the correctness of the sequence of the data packets during transmission and reception can be ensured, and the SDAP layer serving as a receiving end needs to ensure that the data packets can be transmitted to the upper link in sequence.
The embodiment of the present invention further provides a node device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor; the processor implements the air interface switching method according to any one of the above descriptions when executing the program.
Specifically, as shown in fig. 8, the node apparatus includes:
a processor 810 for reading programs in the memory 820;
a transceiver 830 for receiving and transmitting data under the control of the processor 810.
Where in fig. 8, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 810, and various circuits, represented by memory 820, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 830 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 810 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 810 in performing operations.
The processor 810 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 810 in performing operations.
Specifically, when the node device is applied to the SDAP layer, the transceiver 830 and the processor 810 are configured to perform specific steps corresponding to the transceiver and the processor in the embodiment corresponding to fig. 6, and when the node device is applied to the PDCP layer, the transceiver 830 is configured to perform specific steps corresponding to the transceiver in the embodiment corresponding to fig. 7, and details of the steps are not described here.
In addition, a computer-readable storage medium is provided, where a computer program is stored, where the computer program is executed by a processor to implement the steps in the air interface switching method according to any of the foregoing embodiments.
Specifically, the computer readable storage medium is applied to the SDAP layer or the PDCP layer, and the execution steps in the air interface switching method corresponding to the SDAP layer or the PDCP layer are described in detail above when the computer readable storage medium is applied to the SDAP layer or the PDCP layer, which is not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware, or in the form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to perform some steps of the transceiving method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
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 (38)

1. An air interface switching method is applied to a Service Data Adaptation Protocol (SDAP) layer, and the method comprises the following steps:
when the user terminal performs air interface switching, performing data interaction with a packet data convergence protocol PDCP layer to realize reestablishment of a data packet on different low-layer links;
when the user terminal performs air interface switching, the user terminal performs data interaction with a packet data convergence protocol PDCP layer to realize the reestablishment of a data packet on different low-layer links, and the method comprises the following steps:
when the user terminal performs air interface switching, acquiring an identity identification of data to be retransmitted on an SDAP layer from a PDCP layer of a source lower layer link;
determining a retransmission data packet to be retransmitted according to the identity identification mark;
and sending the retransmission data packet to a PDCP layer of a target lower layer link.
2. The air interface switching method according to claim 1, further comprising:
acquiring a current data packet transmitted to a PDCP layer, and caching the current data packet;
and sending the current data packet to a PDCP layer of a corresponding lower-layer link, wherein the current data packet carries the identification mark of the current data packet on the SDAP layer.
3. The air interface switching method according to claim 1, further comprising:
receiving an air interface switching indication configured by Radio Resource Control (RRC) signaling;
determining that the user terminal performs air interface switching according to an air interface switching indication configured by the RRC signaling;
wherein, the step of obtaining the identification identifier of the data needing to be retransmitted at the SDAP layer from the PDCP layer of the source lower layer link comprises the following steps:
sending a request for retransmitting a data packet to the source lower link;
and receiving the identification identifier of the retransmission data packet in the SDAP layer, which is sent by the source lower layer link according to the retransmission data packet request.
4. The air interface switching method according to claim 1, further comprising:
receiving an air interface switching instruction sent by a PDCP layer of a source lower layer link;
in the step of acquiring the identification of the data to be retransmitted on the SDAP layer from the PDCP layer of the source lower link, the identification of the data packet to be retransmitted on the SDAP layer is acquired through the air interface switching indication.
5. The air interface switching method according to claim 1, wherein the step of sending the retransmission packet to the PDCP layer of the target lower layer link comprises:
when the source low-layer link and the target low-layer link belong to the same SDAP layer, directly sending a retransmission data packet on the source low-layer link to the target low-layer link;
and when the source low-layer link and the target low-layer link belong to different SDAP layers, forwarding the retransmission data packet to a target SDAP layer of the target low-layer link.
6. The air interface switching method according to claim 2, wherein after the step of sending the current data packet to the PDCP layer of the corresponding lower link, the method further comprises:
acquiring a notification message of successful transmission of a data packet transmitted by a corresponding lower-layer link, wherein the notification message comprises an identification identifier of the successfully transmitted data packet on an SDAP layer;
and releasing the corresponding data packet according to the identification mark of the successfully sent data packet in the SDAP layer, which is included in the notification message.
7. The air interface switching method according to claim 2, wherein in the step of acquiring the current data packet transmitted to the PDCP layer and caching the current data packet, the current data packet is sequentially stored according to a receiving sequence of the received current data packet.
8. The air interface switching method according to claim 1, further comprising:
as a receiving end, receiving a data packet sent by a packet data convergence protocol PDCP layer;
sorting the received data packets;
and sending the data packets to an upper link according to the sequence of the sequenced data packets.
9. The air interface switching method according to claim 8, wherein in the step of receiving the data packet sent by the packet data convergence protocol PDCP layer:
and when the received data packet has a repeated data packet of the target data packet, discarding the repeated data packet.
10. The air interface switching method according to claim 8, wherein after the step of receiving the data packet sent by the packet data convergence protocol PDCP layer, the method further comprises:
buffering the received data packet.
11. The air interface switching method according to claim 10, further comprising:
acquiring a data packet deletion indication sent by a PDCP layer of a lower link;
and deleting the cached data packet according to the indication.
12. An air interface switching method is applied to a packet data convergence protocol PDCP layer, and comprises the following steps:
when the user terminal switches the air interface, the user terminal performs data interaction with a service data adaptation protocol SDAP layer to realize the reestablishment of the data packet on different low-level links;
when the user terminal performs air interface switching, the user terminal performs data interaction with the SDAP layer, and the step of implementing switching of the data packet on different low-layer links includes:
and sending the identification mark of the data packet to be retransmitted on the SDAP layer to the SDAP layer, so that the SDAP layer determines the retransmitted data packet to be retransmitted according to the identification mark and sends the retransmitted data packet to the PDCP layer of the target low-layer link.
13. The air interface switching method according to claim 12, further comprising:
and acquiring a current data packet sent by the SDAP layer in real time, wherein the current data packet comprises an identification mark of the current data packet on the SDAP layer.
14. The air interface switching method according to claim 12, wherein the step of sending to the SDAP layer an identification identifier of the data packet to be retransmitted on the SDAP layer comprises:
receiving a request for retransmitting a data packet sent by an SDAP layer;
and sending the identification identifier of the retransmission data packet on the SDAP layer to the SDAP layer according to the retransmission data packet request.
15. The air interface switching method according to claim 12, wherein the step of sending to the SDAP layer an identification identifier of the data packet to be retransmitted on the SDAP layer comprises:
and sending an air interface switching instruction to the SDAP layer, wherein the air interface switching instruction comprises an identification mark of the data packet needing to be retransmitted on the SDAP layer.
16. The air interface switching method according to claim 13, wherein after the step of obtaining the current packet sent by the SDAP layer in real time, the method further comprises:
and sending a notification message of successful sending of the data packet to the SDAP layer, wherein the notification message comprises an identification identifier of the successfully sent data packet on the SDAP layer, so that the SDAP layer releases the corresponding data packet.
17. The air interface switching method according to claim 12, further comprising:
when the PDCP layer is applied to a receiving end, the received data packets are sequentially sent to the SDAP layer according to the header information of the received data packets.
18. The air interface switching method according to claim 12, further comprising:
when the PDCP layer is applied to a receiving end, a data packet deleting instruction is sent to the SDAP layer, so that the SDAP layer deletes the cached data packet.
19. A node device, applied to a service data adaptation protocol, SDAP, layer, comprising a transceiver configured to:
when the user terminal performs air interface switching, performing data interaction with a packet data convergence protocol PDCP layer to realize the reestablishment of a data packet on different low-layer links;
wherein the transceiver is specifically configured to:
when the user terminal performs air interface switching, acquiring an identity identification of data to be retransmitted on an SDAP layer from a PDCP layer of a source lower layer link;
determining a retransmission data packet to be retransmitted according to the identity identification mark;
and sending the retransmission data packet to a PDCP layer of a target lower layer link.
20. The node device of claim 19, wherein the transceiver is further configured to:
acquiring a current data packet transmitted to a PDCP layer, and caching the current data packet;
and sending the current data packet to a PDCP layer of a corresponding lower-layer link, wherein the current data packet carries the identification mark of the current data packet on the SDAP layer.
21. The node device of claim 19, wherein the transceiver is further configured to:
receiving an air interface switching indication configured by Radio Resource Control (RRC) signaling;
determining that the user terminal performs air interface switching according to an air interface switching indication configured by the RRC signaling;
wherein, when acquiring the identification identifier of the data to be retransmitted on the SDAP layer from the PDCP layer of the source lower layer link, the transceiver is specifically configured to:
sending a request for retransmitting a data packet to the source lower link;
and receiving the identification identifier of the retransmission data packet in the SDAP layer, which is sent by the source lower layer link according to the retransmission data packet request.
22. The node device of claim 19, wherein the transceiver is further configured to:
receiving an air interface switching instruction sent by a PDCP layer of a source lower layer link;
when the transceiver acquires the identification identifier of the data to be retransmitted on the SDAP layer from the PDCP layer of the source lower layer link, the transceiver acquires the identification identifier of the data packet to be retransmitted on the SDAP layer through the empty port switching indication.
23. The node device of claim 19, wherein the transceiver, when sending the retransmission packet to the PDCP layer of the target lower layer link, is specifically configured to:
when the source low-layer link and the target low-layer link belong to the same SDAP layer, directly sending the retransmission data packet on the source low-layer link to the target low-layer link;
and when the source low-layer link and the target low-layer link belong to different SDAP layers, forwarding the retransmission data packet to a target SDAP layer of the target low-layer link.
24. The node device of claim 20, wherein the transceiver is further configured to:
acquiring a notification message of successful transmission of a data packet transmitted by a corresponding lower-layer link, wherein the notification message comprises an identification identifier of the successfully transmitted data packet on an SDAP layer;
and releasing the corresponding data packet according to the identification mark of the successfully sent data packet in the SDAP layer, which is included in the notification message.
25. The node device of claim 20, wherein the transceiver sequentially stores the current data packets according to a receiving sequence of the received current data packets when acquiring the current data packets transmitted to the PDCP layer and buffering the current data packets.
26. The node device of claim 19, wherein the transceiver is further configured to:
as a receiving end, receiving a data packet sent by a packet data convergence protocol PDCP layer;
sorting the received data packets;
and sending the data packets to an upper link according to the sequence of the sequenced data packets.
27. The node apparatus of claim 26, wherein the transceiver is configured to receive a packet sent by a PDCP layer, and discard a duplicate packet of a target packet when the received packet is the duplicate packet.
28. The node device of claim 26, wherein the node device further comprises:
and the processor is used for buffering the received data packet after the transceiver receives the data packet sent by the packet data convergence protocol PDCP layer.
29. The node device of claim 28, wherein the processor is further configured to:
acquiring a data packet deletion indication sent by a PDCP layer of a lower link;
and deleting the cached data packet according to the indication.
30. A node device applied to a packet data convergence protocol PDCP layer, wherein the node device comprises:
the transceiver is used for carrying out data interaction with a service data adaptation protocol SDAP layer when the user terminal carries out air interface switching, and realizing the reestablishment of a data packet on different low-level links;
wherein the transceiver is specifically configured to:
and sending the identification mark of the data packet to be retransmitted on the SDAP layer to the SDAP layer, so that the SDAP layer determines the retransmitted data packet to be retransmitted according to the identification mark and sends the retransmitted data packet to the PDCP layer of the target low-layer link.
31. The node device of claim 30, wherein the transceiver is further configured to:
and acquiring a current data packet sent by the SDAP layer in real time, wherein the current data packet comprises an identification identifier of the current data packet on the SDAP layer.
32. The node device of claim 30, wherein the transceiver is specifically configured to:
receiving a request for retransmitting a data packet sent by an SDAP layer;
and sending the identification identifier of the retransmission data packet on the SDAP layer to the SDAP layer according to the retransmission data packet request.
33. The node device of claim 30, wherein the transceiver is specifically configured to:
and sending an air interface switching instruction to the SDAP layer, wherein the air interface switching instruction comprises an identification mark of the data packet needing to be retransmitted on the SDAP layer.
34. The node device of claim 31, wherein the transceiver is further configured to:
and sending a notification message of successful sending of the data packet to the SDAP layer, wherein the notification message comprises an identification identifier of the successfully sent data packet on the SDAP layer, so that the SDAP layer releases the corresponding data packet.
35. The node device of claim 30, wherein the transceiver is further configured to:
when the PDCP layer is applied to a receiving end, the received data packets are sequentially transmitted to the SDAP layer according to header information of the received data packets.
36. The node device of claim 30, wherein the transceiver is further configured to:
and when the PDCP layer is applied to a receiving end, sending a data packet deleting instruction to the SDAP layer so that the SDAP layer deletes the cached data packet.
37. A node apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor; characterized in that, when executing the program, the processor implements the air interface switching method according to any one of claims 1 to 11 or implements the air interface switching method according to any one of claims 12 to 18.
38. A computer-readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements the air interface switching method according to any one of claims 1 to 11 or implements the steps in the air interface switching method according to any one of claims 12 to 18.
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