CN115701172A

CN115701172A - Method, equipment and device for sending packet data convergence protocol status report

Info

Publication number: CN115701172A
Application number: CN202110860115.8A
Authority: CN
Inventors: 张惠英; 赵亚利
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2023-02-07
Also published as: WO2023005919A1

Abstract

The embodiment of the application provides a method, equipment and a device for sending a packet data convergence protocol status report, wherein the method comprises the following steps: after partial connection between a first receiving end and a first relay terminal in a first communication link fails, if a second receiving end of a target data unit determines that a second communication link with a second transmitting end of the target data unit is successfully connected, a PDCP status report is sent to the second transmitting end; the PDCP status report is used for indicating the first data unit which is successfully transmitted and/or the second data unit which is failed to be transmitted in the target data unit; the first communication link is a link formed by a first sending end of the target data unit, a first relay terminal and a first receiving end of the target data unit; the first receiving end and the second receiving end are the same or different, and the first transmitting end and the second transmitting end are the same or different. The embodiment of the application realizes the lossless transmission of the data by ensuring that the second sending end accurately knows the unsuccessfully transmitted data.

Description

Method, equipment and device for sending packet data convergence protocol status report

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a method, a device, and an apparatus for sending a status report of a packet data convergence protocol.

Background

The conventional wireless communication adopts a cellular network communication mode, that is, a terminal and a network side device transmit uplink and downlink data/control information through a Uu (Interface between a user equipment and a terrestrial radio access network, UTRAN) Interface. In order to extend Network coverage, one solution is to introduce UE (User Equipment) -to-Network Relay. The UE-to-Network Relay may be a terminal having a Relay function, for the UE-to-Network Relay, an interface between a Relay UE (Relay terminal) and a Network uses a Uu interface, and a relayed terminal (may be referred to as a remote terminal) uses a direct communication interface, and a link between the Relay and the Network may be referred to as a BH (Backhaul link) for the remote terminal.

The existing mechanism high layer triggered PDCP (Packet Data Convergence Protocol) status report is based on PDCP reconstruction or PDCP Data recovery caused by UE handover or path switching. In a Relay scenario, when a radio link failure occurs at a Uu interface between Relay UE and a base station, the Uu interface link cannot transmit data, and both data and signaling sent to the Relay UE by Remote UE (Remote terminal) through a PC5 (Proximity Communication Port 5) interface cannot be transmitted to the base station, resulting in data packet loss; or when the wireless link failure occurs on the PC5 interface between the Relay UE and the Remote UE, the PC5 interface link cannot transmit data, and both the data and the signaling sent by the base station to the Relay UE through the Uu interface cannot be transmitted to the Remote UE, resulting in data packet loss. Therefore, how to implement lossless transmission of data packets in a relay scenario becomes a problem that needs to be solved urgently.

Disclosure of Invention

Aiming at the problems in the prior art, the embodiments of the present application provide a method, a device, and a device for sending a status report of a packet data convergence protocol, so as to solve the defect of data packet loss in a relay scene in the prior art, and implement lossless data transmission.

In a first aspect, an embodiment of the present application provides a method for sending a packet data convergence protocol status report, including:

after a partial connection between a first receiving end and a first relay terminal in a first communication link fails, if a second receiving end of a target data unit determines that a second communication link with a second transmitting end of the target data unit is successfully connected, a Packet Data Convergence Protocol (PDCP) status report is sent to the second transmitting end of the target data unit;

wherein the PDCP status report is used for indicating a first data unit which is successfully transmitted and/or a second data unit which is failed to be transmitted in the target data unit;

the first communication link is a link formed by a first sending end of the target data unit, a first relay terminal and a first receiving end of the target data unit;

the first receiving end and the second receiving end are the same or different, and the first sending end and the second sending end are the same or different.

Optionally, in a case that the first receiving end and the second receiving end are both the first base station, both the first sending end and the second sending end are both the first remote terminal.

Optionally, under the condition that the first receiving end is a second base station and the second receiving end is a third base station, both the first sending end and the second sending end are second remote terminals;

the third base station is a target base station to which the first relay terminal is connected after being switched or reestablished from the second base station; the PDCP status report is determined by the third base station based on first transfer data sent by the second base station, wherein the first transfer data indicates a first data unit that was successfully transmitted and/or a second data unit that failed to be transmitted in the target data unit.

Optionally, in a case that the first receiving end and the second receiving end are both third remote terminals, the first transmitting end and the second transmitting end are both fourth base stations, and the second communication link includes any one of:

the third remote terminal is connected with the link of the fourth base station through the first relay terminal;

the third remote terminal is connected with the link of the fourth base station through a second relay terminal;

and the third remote terminal is directly connected with the fourth base station.

Optionally, in a case that both the first receiving end and the second receiving end are fourth remote terminals, the first sending end is a fifth base station, and the second sending end is a sixth base station;

the sixth base station is a target base station to which the fourth remote terminal is directly connected after being switched, or the sixth base station is a target base station to which the fourth remote terminal is connected through a third relay terminal after being switched or reestablished; the sixth base station stores second transfer data sent by the fifth base station, where the second transfer data includes the target data unit.

Optionally, in a case that both the first receiving end and the second receiving end are fifth remote terminals, both the first transmitting end and the second transmitting end are sixth remote terminals; the second communication link includes a link in which the fifth remote terminal is connected to the sixth remote terminal through the first relay terminal.

Optionally, if the second receiving end of the target data unit determines that the second communication link with the second sending end of the target data unit is successfully connected, sending a packet data convergence protocol PDCP status report to the second sending end of the target data unit, including:

under the condition that the second communication link is successfully connected, receiving a first trigger message sent by the second sending end; and sending the PDCP status report to the second sending end based on the first trigger message.

receiving a second trigger message sent by a fourth relay terminal under the condition that the second communication link is successfully connected and the fourth relay terminal is included; and sending the PDCP status report to the second sending end based on the second trigger message.

In a second aspect, an embodiment of the present application further provides a communication device, including a memory, a transceiver, and a processor, where: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and implementing the steps of the packet data convergence protocol status report sending method according to the first aspect.

In a third aspect, an embodiment of the present application further provides a device for sending a status report of a packet data convergence protocol, including:

a sending module, configured to send a packet data convergence protocol PDCP status report to a second sending end of a target data unit if a second receiving end of the target data unit determines that a second communication link with the second sending end of the target data unit is successfully connected after a partial connection between a first receiving end and a first relay terminal in a first communication link fails;

the first receiving end and the second receiving end are the same or different, and the first transmitting end and the second transmitting end are the same or different.

In a fourth aspect, an embodiment of the present application further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, where the computer program is configured to cause the processor to execute the steps of the packet data convergence protocol status report sending method according to the first aspect.

According to the method, the device, the apparatus, and the storage medium for transmitting the status report of the packet data convergence protocol, after the second communication link is successfully connected, the second receiving end may transmit the PDCP status report to the second transmitting end, so as to ensure that the second transmitting end accurately knows unsuccessfully transmitted data, and further, the second transmitting end may perform retransmission operation on a second data unit that is failed to be transmitted based on the PDCP status report, thereby implementing lossless transmission of data.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic diagram of a conventional wireless communication manner provided by the prior art;

FIG. 2 is a schematic diagram of a prior art device-to-device direct communication scheme;

fig. 3 is a schematic diagram of a UE-to-Network Relay provided in the prior art;

fig. 4 is a schematic diagram of an L2 UE-to-Network Relay user plane protocol stack provided in the prior art;

FIG. 5 is a diagram of a user plane protocol stack of an L2 UE-to-UE Relay provided in the prior art;

FIG. 6 is a diagram of a PDCP status report format provided by the prior art;

fig. 7 is a flowchart illustrating a method for sending a status report of a packet data convergence protocol according to an embodiment of the present application;

fig. 8 is a second flowchart of a method for sending a status report of a packet data convergence protocol according to an embodiment of the present application;

fig. 9 is a third flowchart of a packet data convergence protocol status report sending method according to an embodiment of the present application;

fig. 10 is a fourth flowchart of a packet data convergence protocol status report sending method according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

fig. 12 is a second schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a packet data convergence protocol status report sending apparatus according to an embodiment of the present application.

Detailed Description

In the embodiment of the present application, the term "and/or" describes an association relationship of associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

To facilitate a clearer understanding of the embodiments of the present application, some relevant background information is first presented below.

(1) Cellular network communications;

fig. 1 is a schematic diagram of a conventional wireless communication method provided in the prior art, and as shown in fig. 1, the conventional wireless communication method adopts a cellular network communication method, that is, a terminal and a network side device perform uplink and downlink data/control information transmission through a Uu interface.

(2) Direct communication;

fig. 2 is a schematic diagram of a device-to-device direct communication method provided in the prior art, and as shown in fig. 2, the direct communication refers to a method in which a neighboring terminal can perform data transmission through a direct communication link (also referred to as Sidelink or PC 5) in a short distance. The wireless interface to which the Sidelink link corresponds is referred to as a direct communication interface (also referred to as the Sidelink interface or the PC5 interface).

(3)UE-to-Network Relay；

Fig. 3 is a schematic diagram of a UE-to-Network Relay provided in the prior art, and as shown in fig. 3, in order to extend Network coverage, the UE-to-Network Relay may be introduced. The node of the UE-to-Network Relay as Relay may itself be a terminal having a Relay function. For UE-to-Network Relay, the interface between the Relay and the Network uses the Uu interface, and the interface between the relayed UE (remote UE) uses a direct communication interface (also called the Sidelink interface or PC5 interface). The link between the relay and the network may be referred to as a Backhaul link for the remote UE.

(4) An L2 UE-to-Network Relay and UE-to-UE Relay user plane protocol stack;

fig. 4 is a schematic diagram of an L2 UE-to-Network Relay user plane protocol stack provided in the prior art, and fig. 5 is a schematic diagram of an L2 UE-to-UE Relay user plane protocol stack provided in the prior art, as shown in fig. 4 and fig. 5, regardless of whether an L2U 2N (UE-to-Network) Relay or an L2U (UE-to-UE, terminal-to-terminal) Relay, a PDCP (packet data convergence protocol) stack and the above layers are end-to-end protocol stacks, and an adaptation layer and an RLC (RLC Radio Link Control, radio Link Control) stack and the following layers are hop-by-hop protocol stacks.

(5) PDCP status report (PDCP status report);

fig. 6 is a diagram illustrating a PDCP status report format provided by the prior art, and as shown in fig. 6, the PDCP status report is used by a receiving end to report data reception to a transmitting end. Wherein D/C is 0, indicating that the PDU is a control PDU (Protocol Data Unit), PDU type is set to 000, and representing that the PDCP control PDU is a PDCP status report. The FMC (Fist Missing COUNT value of the first Missing packet Data convergence protocol Service Data Unit) is set to the COUNT value of the first Missing PDCP SDU (Service Data Unit Service Data Unit). A Bitmap is used to indicate whether each PDCP SDU is correctly received after FMC, as shown in table 1, when the sending end PDCP receives a PDCP status report, the PDCP SDU with the COUNT value smaller than FMC and the PDCP SDU with the corresponding COUNT value position value of 1 in the Bitmap are discarded. The existing PDCP status report triggering conditions are as follows: the trigger conditions for AM (Acknowledged Mode) DRB (Data Radio Bearer) include that the upper layer requests PDCP entity reconstruction, the upper layer requests PDCP Data recovery, the upper layer requests uplink Data transfer, and the upper layer reconfigures the PDCP entity to release DAPS (dual active Protocol Stack) with DAPS-source release; the trigger condition for UM (Unacknowledged Mode) DRB includes that the upper layer requests uplink data transfer; the trigger condition for sidelink AM DRB includes the higher layer requesting PDCP entity re-establishment.

TABLE 1 Bitmap (Bitmap)

At present, a relay scene in the prior art has a defect of data packet loss, and the sending method, the device and the apparatus for packet data convergence protocol status report provided by the embodiments of the present application can implement lossless data transmission.

Fig. 7 is a flowchart of a packet data convergence protocol status report sending method according to an embodiment of the present application, and as shown in fig. 7, the method includes the following steps:

step 700, after a partial connection between a first receiving end in a first communication link and a first relay terminal fails, if a second receiving end of a target data unit determines that a second communication link with a second transmitting end of the target data unit is successful, sending a PDCP status report to the second transmitting end of the target data unit;

Specifically, the target data unit may be a data unit that needs to be sent from the sending end to the receiving end. The receiving end may be a remote terminal or a base station, and correspondingly, the transmitting end may be a base station or a remote terminal.

Alternatively, the execution subject of the packet data convergence protocol status report sending method may be the second receiving end of the target data unit.

Alternatively, the communication link between the first transmitting end and the first receiving end may include a first relay terminal, and the communication link between the first transmitting end and the first receiving end may be a first communication link.

Alternatively, in the case that the first transmitting end is a far-end terminal device and the first receiving end is a base station device, the case that part of the connection between the first receiving end and the first relay terminal in the first communication link fails may be: the Uu interface radio link between the first relay terminal and the first receiving end fails.

Alternatively, in the case that the first transmitting end is a base station device and the first receiving end is a far-end terminal device, the case that part of the connection between the first receiving end and the first relay terminal in the first communication link fails may be: the PC5 interface radio link between the first relay terminal and the first receiving end fails.

Alternatively, in the case that the first sending end is a far-end terminal device and the first receiving end is a far-end terminal device, the case that part of the connection between the first receiving end and the first relay terminal in the first communication link fails may be: the PC5 interface radio link between the first relay terminal and the first receiving terminal fails.

Optionally, after a partial connection between a first receiving end and a first relay terminal in a first communication link fails, RRC reestablishment may be performed on a link between a first transmitting end and the first receiving end, and in a second communication link after RRC reestablishment is successful, the transmitting end may be a second transmitting end, and the receiving end may be a second receiving end.

Optionally, the first receiving end and the second receiving end are the same or different, and the first transmitting end and the second transmitting end are the same or different.

Alternatively, the second data unit that failed transmission may be kept in the first sender of the target data unit until it is retransmitted, i.e. not deleted by the first sender.

Several alternative RRC re-establishment schemes in case of a partial connection failure between the first receiving end and the first relay terminal in the first communication link are illustrated below.

For example, when the first sending end is a Remote terminal device and the first receiving end is a Base Station device, the first sending end may be a Remote terminal Remote UE1, the first receiving end may be a Base Station BS1 (Base Station 1), the first Relay terminal may be a Relay terminal Relay UE1, after a Uu interface wireless link between the Relay terminal Relay UE1 and the Base Station BS1 fails, RRC reestablishment is performed on the link, and the Remote terminal Remote UE1 may reestablish a connection of the second communication link with the Base Station BS1 through the Relay terminal Relay UE1, in this case, the first receiving end and the second receiving end are both the Base Station BS1, and meanwhile, the first sending end and the second sending end are both the Remote terminal Remote UE1.

For example, when the first sending end is a Remote terminal device and the first receiving end is a base station device, the first sending end may be a Remote terminal Remote UE2, the first receiving end may be a base station BS2, the first Relay terminal may be a Relay terminal Relay UE1, after a Uu interface radio link between the Relay terminal Relay UE1 and the base station BS2 fails, RRC reestablishment is performed on the link, the Remote terminal Remote UE2 may establish a connection of a second communication link with a target base station BS3 through the Relay terminal Relay UE1, in this case, the second sending end is the Remote terminal Remote UE2, and the second receiving end is the target base station BS3.

For example, in a case where the first sending end is a base station device and the first receiving end is a Remote terminal device, the first sending end may be a base station BS4, the first receiving end may be a Remote terminal Relay UE3, the first Relay terminal may be a Relay terminal Relay UE1, after a wireless link of a PC5 interface between the Relay terminal Relay UE1 and the Remote terminal Relay UE3 fails, RRC reestablishment is performed on the link, and the Remote terminal Relay UE3 may reestablish connection of a second communication link with the base station BS4, in this case, the second communication link may be a link in which the Remote terminal Relay UE3 is connected with the base station BS4 through the Relay terminal Relay UE1, the second communication link may be a link in which the Remote terminal Relay UE3 is connected with the base station BS4 through another Relay terminal Relay UE2, and the second communication link may also be a link in which the Remote terminal Relay UE3 is directly connected with the base station BS 4.

For example, in a case where the first sending end is a base station device and the first receiving end is a Remote terminal device, the first sending end may be a base station BS5, the first receiving end may be a Remote terminal Relay UE4, the first Relay terminal may be a Relay terminal Relay UE1, after a PC5 interface radio link between the Relay terminal Relay UE1 and the Remote terminal Relay UE4 fails, RRC reestablishment is performed on the link, and the Remote terminal Relay UE4 may establish connection of a second communication link with the target base station BS6, in this case, the second communication link may be a link in which the Remote terminal Relay UE4 is directly connected with the target base station BS6, and the second communication link may also be a link in which the Remote terminal Relay UE4 is connected with the target base station BS6 through another Relay terminal Relay UE 3.

For example, when the first sending end is a Remote terminal device and the first receiving end is a Remote terminal device, the first sending end may be a Remote terminal Remote UE6, the first receiving end may be a Remote terminal Remote UE5, the first Relay terminal may be a Relay terminal Relay UE1, after a wireless link of a PC5 interface between the Relay terminal Relay UE1 and the Remote terminal Remote UE5 fails, RRC reestablishment is performed on the link, and the Remote terminal Remote UE6 may reestablish a connection of a second communication link with the Remote terminal Remote UE5 through the Relay terminal Relay UE1, in this case, the first receiving end and the second receiving end are both Remote UEs 5, and meanwhile, the first sending end and the second sending end are both Remote terminals Remote UEs 6.

Optionally, after the second receiving end determines that the second communication link with the second transmitting end is successfully connected, the PDCP status report may be sent to the second transmitting end. After receiving the PDCP status report, the second transmitting end may learn, based on the PDCP status report, a first data unit that is successfully transmitted and/or a second data unit that is failed to be transmitted in the target data unit. The second sender may perform a retransmission operation on the second data unit such that the second receiver receives the second data unit.

Alternatively, in the case of a partial connection failure between the first receiving end and the first relay terminal in the first communication link, the first transmitting end may continuously save the target data so that the second data unit is not deleted by the first transmitting end. For example, after a partial connection failure between a first receiving end and a first relay terminal in a first communication link, the first relay terminal sends a link failure message to a first sending end, and the first sending end may start a mechanism of "not performing a packet deletion operation based on an RLC data transmission success indication" based on the message, thereby ensuring that the second data unit is not deleted by the first sending end.

Alternatively, in the case where the second communication link is successfully connected, the second transmitting end may change from the mechanism of "performing a packet deletion operation without the RLC data transmission success indication" to the mechanism of "performing a packet deletion operation based on the RLC data transmission success indication".

Optionally, in case the second communication link is successfully connected, the second receiving end may send a PDCP status report to the second receiving end based on a default mechanism.

Optionally, in case that the second communication link is successfully connected, the second sending end may send a trigger message to the second receiving end, and the second receiving end may send the PDCP status report to the second receiving end based on the trigger message.

Optionally, in a case that the second communication link is successfully connected and includes the relay terminal, the relay terminal in the second communication link may send a trigger message to the second receiving end, and the second receiving end may send the PDCP status report to the second receiving end based on the trigger message.

According to the sending method for the status report of the packet data convergence protocol, after the second communication link is successfully connected, the second receiving end can send the PDCP status report to the second sending end, so that the second sending end can accurately acquire unsuccessfully transmitted data, and further the second sending end can execute retransmission operation on the second data unit which is failed in transmission based on the PDCP status report, and lossless transmission of data is achieved.

Optionally, under the condition that the first receiving end and the second receiving end are both the first base station, the first sending end and the second sending end are both the first remote terminal.

Specifically, for the first receiving end and the second receiving end both being the first base station, it can be understood that, in the case that the first receiving end is the base station device, the first receiving end and the second receiving end are the same base station device, that is, the first receiving end is the first base station and the second receiving end is the first base station.

For the first sending end and the second sending end both being the first far-end terminal, it can be understood that, in the case where the first receiving end and the second receiving end both being the first base station, the first sending end and the second sending end may be the same far-end terminal device, that is, the first sending end is the first far-end terminal and the second sending end is the first far-end terminal.

In this embodiment of the present application, when the first sending end is a Remote terminal device and the first receiving end is a base station device, the first sending end may be a Remote terminal Remote UE1, the first receiving end may be a base station BS1, the first Relay terminal may be a Relay terminal Relay UE1, after a Uu interface wireless link between the Relay terminal Relay UE1 and the base station BS1 fails, RRC reestablishment is performed on the link, and the Remote terminal Remote UE1 may reestablish a connection of a second communication link with the base station BS1 through the Relay terminal Relay UE1, in this case, the first receiving end and the second receiving end are both the base station BS1, and meanwhile, the first sending end and the second sending end are both the Remote terminal Remote UE1.

Specifically, for the first receiving end being the second base station and the second receiving end being the third base station, it may be understood that, in the case that the first receiving end is the base station device, the first receiving end may be the second base station, and in the RRC reestablishment process, the first relay terminal may be switched from the second base station to be connected to the target base station, and the target base station may be the third base station, that is, the second receiving end may be the third base station.

For the first sending end and the second sending end both being the second far-end terminal, it can be understood that, in the case that the second receiving end is the third base station, the first sending end and the second sending end may be the same far-end terminal device, that is, the first sending end is the second far-end terminal and the second sending end is the second far-end terminal.

Optionally, after the second communication link is successfully connected, the first receiving end may send first transfer data to the third base station, where the first transfer data may be understood as a first data unit used to indicate that the target data unit is successfully transmitted and/or a second data unit that fails to be transmitted, and then the third base station may generate, based on the first transfer data, a PDCP status report sent to the second sending end.

In this embodiment of the present application, when the first sending end is a Remote terminal device and the first receiving end is a base station device, the first sending end may be a Remote terminal Remote UE2, the first receiving end may be a base station BS2, the first Relay terminal may be a Relay terminal Relay UE1, after a Uu interface wireless link between the Relay terminal Relay UE1 and the base station BS2 fails, RRC reestablishment is performed on the link, the Remote terminal Remote UE2 may establish a connection of a second communication link with one target base station BS3 through the Relay terminal Relay UE1, in this case, the second sending end is the Remote terminal Remote UE2, and the second receiving end is the target base station BS3.

Optionally, when both the first receiving end and the second receiving end are third remote terminals, both the first transmitting end and the second transmitting end are fourth base stations, and the second communication link includes any one of the following:

Specifically, for both the first receiving end and the second receiving end being the third remote end terminal, it can be understood that the first receiving end and the second receiving end may be the same remote end terminal device, that is, the first receiving end is the third remote end terminal and the second receiving end is also the third remote end terminal.

For the first sending end and the second sending end both being the fourth base station, it can be understood that the first sending end and the second sending end may be the same base station device, that is, the first sending end is the fourth base station and the second sending end is also the fourth base station.

Optionally, the second communication link may be a link in which the third remote terminal is connected to the fourth base station through the first relay terminal; the second communication link may be a link in which the third remote terminal is connected to the fourth base station through a second relay terminal (different from the first relay terminal); the second communication link may also be a link in which the third remote terminal and the fourth base station are directly connected.

In this embodiment of the present application, when the first sending end is a base station device and the first receiving end is a Remote terminal device, the first sending end may be a base station BS4, the first receiving end may be a Remote terminal Remote UE3, the first Relay terminal may be a Relay terminal Relay UE1, after a wireless link of a PC5 interface between the Relay terminal Relay UE1 and the Remote terminal Remote UE3 fails, RRC reestablishment is performed on the link, the Remote terminal Remote UE3 may reestablish a connection of a second communication link with the base station BS4, in this case, the second communication link may be a link through which the Remote terminal Relay UE3 is connected with the base station BS4 through the Relay terminal Relay UE1, the second communication link may be a link through which the Remote terminal Relay UE3 is connected with the base station BS4 through another Relay terminal Relay UE2, and the second communication link may also be a link through which the Remote terminal Relay UE3 is directly connected with the base station BS 4.

Specifically, for the first receiving end and the second receiving end both being the fourth far-end terminal, it can be understood that the first receiving end and the second receiving end may be the same far-end terminal device, that is, the first receiving end is the fourth far-end terminal and the second receiving end is also the fourth far-end terminal.

For the first sending end being the fifth base station and the second sending end being the sixth base station, it can be understood that the first sending end may be the fifth base station, and in the RRC reestablishment process, the fourth remote terminal may be switched from the fifth base station to be connected to the target base station, and the target base station may be the sixth base station, that is, the second sending end is the sixth base station.

Optionally, the sixth base station may be a target base station to which the fourth remote terminal is directly connected after being handed over; the sixth base station may also be a target base station to which the fourth remote terminal is connected through a third relay terminal (different from the first relay terminal) after the handover.

Optionally, after the second communication link is successfully connected, the fifth base station may send second transfer data to the sixth base station, where the second transfer data may include the target data unit, so that the sixth base station may perform a retransmission operation on the second data unit after knowing, according to the PDCP status report sent by the second receiving end, the second data unit that is failed to be transmitted in the target data unit.

In this embodiment, when the first sending end is a base station device and the first receiving end is a Remote terminal device, the first sending end may be a base station BS5, the first receiving end may be a Remote terminal Remote UE4, the first Relay terminal may be a Relay terminal Relay UE1, after a wireless link of a PC5 interface between the Relay terminal Relay UE1 and the Remote terminal Remote UE4 fails, RRC reestablishment is performed on the link, the Remote terminal Remote UE4 may establish connection of a second communication link with a target base station BS6, in this case, the second communication link may be a link in which the Remote terminal Relay UE4 is directly connected with the target base station BS6, and the second communication link may also be a link in which the Remote terminal Remote UE4 is connected with the target base station BS6 through another Relay terminal Relay UE 3.

Specifically, for the first receiving end and the second receiving end both being the fifth remote end terminal, it can be understood that, in the case that the first receiving end is the remote end terminal device, the first receiving end and the second receiving end are the same remote end terminal device, that is, the first receiving end is the fifth remote end terminal and the second receiving end is the fifth remote end terminal.

For the case that the first sending end and the second sending end are both the sixth far-end terminal, it can be understood that, in the case that the first receiving end and the second receiving end are both the fifth far-end terminal, the first sending end and the second sending end may be the same far-end terminal device, that is, the first sending end is the sixth far-end terminal and the second sending end is also the sixth far-end terminal.

In this embodiment of the present application, when the first sending end is a Remote terminal device and the first receiving end is a Remote terminal device, the first sending end may be a Remote terminal Remote UE6, the first receiving end may be a Remote terminal Remote UE5, the first Relay terminal may be a Relay terminal Relay UE1, after a wireless link of a PC5 interface between the Relay terminal Relay UE1 and the Remote terminal Remote UE5 fails, RRC reestablishment is performed on the link, and the Remote terminal Remote UE6 may reestablish a connection of the second communication link with the Remote terminal Remote UE5 through the Relay terminal Relay UE1, in this case, the first receiving end and the second receiving end are both Remote UEs 5, and meanwhile, the first sending end and the second sending end are both Remote terminals Remote UEs 6.

Optionally, the method comprises: under the condition that the second communication link is successfully connected, receiving a first trigger message sent by the second sending end; and sending the PDCP status report to the second sending end based on the first trigger message.

Specifically, under the condition that the second communication link is successfully connected, the second sending end may send a trigger message (i.e., the first trigger message) to the second receiving end, and the second receiving end may send the PDCP status report to the second receiving end based on the trigger message.

Optionally, the method comprises: receiving a second trigger message sent by a fourth relay terminal under the condition that the second communication link is successfully connected and the fourth relay terminal is included; transmitting the PDCP status report to the second transmitting end based on the second trigger message.

Specifically, under the condition that the second communication link is successfully connected and includes the relay terminal, the relay terminal in the second communication link may send a trigger message (i.e., a second trigger message) to the second receiving end, and the second receiving end may send the PDCP status report to the second receiving end based on the trigger message.

Fig. 8 is a second flowchart of a method for sending a status report of a packet data convergence protocol according to an embodiment of the present application, and as shown in fig. 8, in this embodiment, a first remote terminal accesses a first base station through an L2 first relay terminal, and the first relay terminal has a Uu interface radio link failure and then is successfully reestablished at the first base station. Wherein, the specific description of each step is as follows:

initially a first remote terminal resides in a cell 1 controlled by a first base station through a first relay terminal.

Step 801, data transmission;

specifically, the first remote terminal performs data transmission with the first base station through the first relay terminal.

Step 802, the Uu interface radio link fails;

specifically, the first relay terminal has a Uu interface radio link failure.

Step 803, RRC reestablishment;

specifically, the first relay terminal triggers a Uu interface RRC reestablishment process, and reestablishes successfully at the first base station.

Step 804, triggering a message;

specifically, the first relay terminal sends a trigger message to the first base station, where the trigger message is used to trigger the first base station to send a PDCP status report.

Optionally, the first remote terminal may send a trigger message to the first base station for triggering the first base station to send the PDCP status report.

Optionally, the first base station may send PDCP status report based on a default mechanism (no trigger message required).

Step 805, PDCP status report;

specifically, the first base station sends a PDCP status report of uplink data to the first remote terminal.

And step 806, data transmission.

Specifically, the first remote terminal may process the PDCP SDU based on the received PDCP status report, and retransmit the PDCP SDU that the opposite terminal did not correctly receive according to the FMC and bitmap instruction.

Fig. 9 is a third flowchart of a method for sending a status report of a packet data convergence protocol according to an embodiment of the present invention, where as shown in fig. 9, in this embodiment, a second remote terminal accesses a second base station through an L2 first relay terminal, and the first relay terminal has a Uu interface radio link failure, and then is successfully reestablished at a third base station. Wherein, the specific description of each step is as follows:

the initial second remote terminal resides in cell 1 controlled by the second base station through the first relay terminal.

Step 901, data transmission;

specifically, the second remote terminal performs data transmission with the second base station through the first relay terminal.

Step 902, the Uu interface radio link fails;

specifically, the first relay terminal has a Uu interface radio link failure.

Step 903, RRC reestablishment;

specifically, the first relay terminal triggers a Uu interface RRC reestablishment process, and reestablishes successfully at the third base station.

Step 904, data transfer;

specifically, the context of the relay UE1 and the second remote terminal connected thereto is exchanged between the second base station and the third base station, and the data is transferred.

Optionally, the second base station sends first transfer data to the third base station, where the first transfer data is used to indicate a first data unit that is successfully transmitted and/or a second data unit that is failed to be transmitted in the target data unit, and then the third base station may generate a PDCP status report sent to the second remote terminal based on the first transfer data.

Step 905, triggering a message;

specifically, the first relay terminal sends a trigger message to the third base station, where the trigger message is used to trigger the third base station to send a PDCP status report.

Optionally, the second remote terminal may send a trigger message to the third base station for triggering the third base station to send the PDCP status report.

Optionally, the third base station may send PDCP status report based on a default mechanism (no trigger message required).

Step 906, PDCP status report;

specifically, the third base station sends a PDCP status report of uplink data to the second remote terminal

And step 907, data transmission.

Specifically, the third base station may process the PDCP SDU based on the received PDCP status report, and retransmit the PDCP SDU that the opposite terminal did not correctly receive according to the FMC and bitmap instruction.

Fig. 10 is a fourth flowchart of a packet data convergence protocol status report sending method according to an embodiment of the present application, and as shown in fig. 10, in this embodiment, a sixth remote terminal accesses a fifth remote terminal through an L2 first relay terminal, a wireless link between PC5 interfaces of the first relay terminal and the fifth remote terminal fails, and then RRC reestablishment succeeds. Wherein, the specific description of each step is as follows:

and the initial sixth remote terminal communicates with the fifth remote terminal through the first relay terminal.

Step 1001, data transmission;

specifically, the sixth remote terminal performs data transmission with the fifth remote terminal through the first relay terminal.

Step 1002, the wireless link of the PC5 interface of the first relay terminal and the fifth remote terminal fails;

step 1003, RRC reestablishment;

specifically, the first relay terminal triggers a PC5 interface RRC reestablishment procedure, and reestablishes successfully with the fifth remote terminal.

Step 1004, triggering a message;

specifically, the first relay terminal sends a trigger message to the fifth remote terminal, where the trigger message is used to trigger the fifth remote terminal to send a PDCP status report.

Optionally, the sixth remote terminal may send a trigger message to the fifth remote terminal, for triggering the base station 1 to send the PDCP status report.

Optionally, the fifth remote terminal may send a PDCP status report based on a default mechanism (no trigger message is required).

Step 1005, PDCP status report;

specifically, the fifth remote terminal sends a PDCP status report of uplink data to the sixth remote terminal.

And step 1006, data transmission.

Specifically, the sixth remote terminal may process the PDCP SDU based on the received PDCP status report, and retransmit the PDCP SDU that the opposite terminal did not correctly receive according to the FMC and bitmap instruction.

The technical scheme provided by the embodiment of the application can be suitable for various systems, especially 5G systems. For example, the applicable system may be a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) system, a long term evolution (long term evolution, LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, an LTE-a (long term evolution) system, a universal mobile system (universal mobile telecommunications system, UMTS), a universal internet Access (WiMAX) system, a New Radio Network (NR) system, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5 GS), and the like.

The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for serving a terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames with Internet Protocol (IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB) or an e-NodeB) in a Long Term Evolution (LTE) System, a 5G Base Station (gNB) in a 5G network architecture (next generation System), a Home evolved Node B (HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico), and the like, which are not limited in the embodiments of the present application. In some network architectures, a network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

The terminal referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. In different systems, the names of the terminals may be different, for example, in a 5G system, the terminals may be referred to as User terminals or User Equipments (UEs). A wireless terminal device, which may be a mobile terminal device such as a mobile phone (or called a "cellular" phone) and a computer having a mobile terminal device, for example, a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN), and may exchange languages and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.

The network device and the terminal may each use one or more antennas for Multiple Input Multiple Output (MIMO) transmission, and the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of root antenna combinations.

The method and the device provided by the embodiments of the application are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

Fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application, where the communication device may be a second receiving end; as shown in fig. 11, in case that the second receiving end is a base station, the base station includes a memory 1120, a transceiver 1110 and a processor 1100, wherein:

a memory 1120 for storing a computer program; a transceiver 1110 for transceiving data under the control of the processor 1100. A processor 1100 for reading the computer program in the memory and performing the following operations:

after partial connection between a first receiving end and a first relay terminal in a first communication link fails, if a second receiving end of a target data unit determines that a second communication link with a second transmitting end of the target data unit is successfully connected, a PDCP status report is sent to the second transmitting end of the target data unit;

According to the communication device provided by the embodiment of the application, after the second communication link is successfully connected, the second receiving terminal can send the PDCP status report to the second sending terminal, so that the second sending terminal can accurately acquire unsuccessfully transmitted data, and then the second sending terminal can execute retransmission operation on the second data unit which is failed in transmission based on the PDCP status report, thereby realizing lossless transmission of data.

Optionally, in a case that the first receiving end is a second base station and the second receiving end is a third base station, both the first sending end and the second sending end are second remote terminals;

the third remote terminal is connected with the link of the fourth base station through a second relay terminal; and a link in which the third remote terminal and the fourth base station are directly connected.

Optionally, if the second receiving end of the target data unit determines that the second communication link with the second transmitting end of the target data unit is successfully connected, the second receiving end of the target data unit sends a PDCP status report to the second transmitting end of the target data unit, where the operation includes: under the condition that the second communication link is successfully connected, receiving a first trigger message sent by the second sending end; and sending the PDCP status report to the second sending end based on the first trigger message.

Optionally, if the second receiving end of the target data unit determines that the second communication link with the second transmitting end of the target data unit is successfully connected, the second receiving end of the target data unit sends a PDCP status report to the second transmitting end of the target data unit, where the operation includes: receiving a second trigger message sent by a fourth relay terminal under the condition that the second communication link is successfully connected and the fourth relay terminal is included; transmitting the PDCP status report to the second transmitting end based on the second trigger message.

According to the communication device provided by the embodiment of the application, after the second communication link is successfully connected, the second receiving end can send the PDCP status report to the second sending end, so that the second sending end can accurately obtain unsuccessfully transmitted data, and then the second sending end can perform retransmission operation on the second data unit which is failed to be transmitted based on the PDCP status report, thereby realizing lossless transmission of data.

Where in fig. 11, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1100, and various circuits, represented by memory 1120, 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 1110 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like.

The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1100 in performing operations.

Alternatively, the processor 1100 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also adopt a multi-core architecture.

The processor 1100 is configured to execute any of the methods provided by the embodiments of the present application by calling the computer program stored in the memory 1120 according to the obtained executable instructions. The processor 1100 and the memory 1120 may also be physically disposed separately.

Fig. 12 is a second schematic structural diagram of a communication device according to an embodiment of the present invention, where the communication device may be a second receiving end, and as shown in fig. 12, in a case where the second receiving end is a far-end terminal, the terminal includes a memory 1220, a transceiver 1210, and a processor 1200, where:

a memory 1220 for storing computer programs; a transceiver 1210 for transceiving data under the control of the processor 1200. A processor 1200 for reading the computer program in the memory and performing the following operations:

after a partial connection between a first receiving end and a first relay terminal in a first communication link fails, if a second receiving end of a target data unit determines that a second communication link with a second transmitting end of the target data unit is successfully connected, a PDCP status report is sent to the second transmitting end of the target data unit;

Optionally, if it is determined that the second communication link with the second sending end of the target data unit is successfully connected, the second receiving end of the target data unit sends a PDCP status report to the second sending end of the target data unit, where the operation includes: under the condition that the second communication link is successfully connected, receiving a first trigger message sent by the second sending end; and sending the PDCP status report to the second sending end based on the first trigger message.

Optionally, if the second receiving end of the target data unit determines that the second communication link with the second transmitting end of the target data unit is successfully connected, the second receiving end of the target data unit sends a PDCP status report to the second transmitting end of the target data unit, where the operation includes: receiving a second trigger message sent by a fourth relay terminal under the condition that the second communication link is successfully connected and the fourth relay terminal is included; and sending the PDCP status report to the second sending end based on the second trigger message.

Where in fig. 12, the bus architecture may include any number of interconnected buses and bridges, with various circuits of one or more processors represented by processor 1200 and memory represented by memory 1220 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 1210 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. For different user devices, the user interface 1230 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1200 is responsible for managing the bus architecture and general processing, and the memory 1220 may store data used by the processor 1200 in performing operations.

Alternatively, the processor 1200 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also adopt a multi-core architecture.

The processor 1200 calls the computer program stored in the memory 1220 to execute any of the methods provided by the embodiments of the present application according to the obtained executable instructions. The processor 1200 and the memory 1220 may also be physically disposed separately.

It should be noted that, the target network device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated herein.

Fig. 13 is a schematic structural diagram of a packet data convergence protocol status report sending apparatus according to an embodiment of the present application, and as shown in fig. 13, the apparatus includes:

a sending module 1300, configured to send a PDCP status report to a second sending end of a target data unit if a second receiving end of the target data unit determines that a second communication link with the second sending end of the target data unit is successfully connected after a partial connection between a first receiving end and a first relay terminal in a first communication link fails;

According to the packet data convergence protocol status report sending device provided by the embodiment of the application, after the second communication link is successfully connected, the second receiving terminal can send the PDCP status report to the second sending terminal, so that the second sending terminal can accurately acquire unsuccessfully transmitted data, and further, the second sending terminal can execute retransmission operation on the second data unit which is failed in transmission based on the PDCP status report, and lossless transmission of data is realized.

and a link in which the third remote terminal and the fourth base station are directly connected.

the sixth base station is a target base station to which the fourth remote terminal is directly connected after being switched, or the sixth base station is a target base station to which the fourth remote terminal is connected through a third relay terminal after being switched or reestablished;

the sixth base station stores second transfer data sent by the fifth base station, where the second transfer data includes the target data unit.

Optionally, the apparatus comprises:

a first receiving unit and a first transmitting unit;

the first receiving unit is configured to receive a first trigger message sent by the second sending end under the condition that the second communication link is successfully connected;

the first sending unit is configured to send the PDCP status report to the second sending terminal based on the first trigger message.

Optionally, the apparatus comprises:

a second receiving unit and a second transmitting unit;

the second receiving unit is configured to receive a second trigger message sent by a fourth relay terminal when the second communication link is successfully connected and the second communication link includes the fourth relay terminal;

the second sending unit is configured to send the PDCP status report to the second sending end based on the second trigger message.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. 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.

It should be noted that the apparatus provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

On the other hand, an embodiment of the present application further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, where the computer program is configured to enable the processor to execute the packet data convergence protocol status report sending method provided in the foregoing embodiments, and the method includes:

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), solid State Disks (SSDs)), etc.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method for sending a packet data convergence protocol status report is characterized by comprising the following steps:

after partial connection between a first receiving end and a first relay terminal in a first communication link fails, if a second receiving end of a target data unit determines that a second communication link with a second transmitting end of the target data unit is successfully connected, a Packet Data Convergence Protocol (PDCP) status report is sent to the second transmitting end of the target data unit;

wherein the PDCP status report is used for indicating a first data unit which is successfully transmitted and/or a second data unit which is failed to be transmitted in the target data unit; the first communication link is a link formed by a first sending end of the target data unit, a first relay terminal and a first receiving end of the target data unit;

2. The method according to claim 1, wherein the first transmitting end and the second transmitting end are both first remote terminals when the first receiving end and the second receiving end are both first base stations.

3. The method according to claim 1, wherein the first sending end and the second sending end are both second remote terminals when the first receiving end is a second base station and the second receiving end is a third base station;

4. The method according to claim 1, wherein when the first receiving end and the second receiving end are both third remote terminals, the first transmitting end and the second transmitting end are both fourth base stations, and the second communication link includes any one of:

5. The method according to claim 1, wherein when both the first receiving end and the second receiving end are fourth remote terminals, the first transmitting end is a fifth base station, and the second transmitting end is a sixth base station;

6. The method according to claim 1, wherein when the first receiving end and the second receiving end are both fifth remote terminals, the first transmitting end and the second transmitting end are both sixth remote terminals; the second communication link includes a link in which the fifth remote terminal is connected to the sixth remote terminal through the first relay terminal.

7. The method according to claim 1, wherein if the second receiving end of the target data unit determines that the second communication link with the second transmitting end of the target data unit is successfully connected, the method sends a packet data convergence protocol PDCP status report to the second transmitting end of the target data unit, including:

under the condition that the second communication link is successfully connected, receiving a first trigger message sent by the second sending end;

and sending the PDCP status report to the second sending end based on the first trigger message.

8. The method according to claim 1, wherein if the second receiving end of the target data unit determines that the second communication link with the second transmitting end of the target data unit is successfully connected, the method sends a packet data convergence protocol PDCP status report to the second transmitting end of the target data unit, including:

receiving a second trigger message sent by a fourth relay terminal under the condition that the second communication link is successfully connected and the fourth relay terminal is included;

and sending the PDCP status report to the second sending end based on the second trigger message.

9. A communication device comprising a memory, a transceiver, a processor:

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

10. The apparatus according to claim 9, wherein the first transmitting end and the second transmitting end are both first remote terminals when the first receiving end and the second receiving end are both first base stations.

11. The apparatus according to claim 9, wherein in a case where the first receiving end is a second base station and the second receiving end is a third base station, both the first transmitting end and the second transmitting end are second remote terminals;

12. The apparatus according to claim 9, wherein in a case that the first receiving end and the second receiving end are both third remote terminals, the first transmitting end and the second transmitting end are both fourth base stations, and the second communication link includes any one of:

13. The apparatus according to claim 9, wherein in a case where both the first receiving end and the second receiving end are fourth remote terminals, the first transmitting end is a fifth base station, and the second transmitting end is a sixth base station;

14. The apparatus according to claim 9, wherein in a case where the first receiving end and the second receiving end are both fifth remote terminals, the first transmitting end and the second transmitting end are both sixth remote terminals; the second communication link includes a link in which the fifth remote terminal is connected to the sixth remote terminal through the first relay terminal.

15. The communications device of claim 9, wherein if the second receiver of the target data unit determines that the second communication link with the second transmitter of the target data unit is successful, then sending a Packet Data Convergence Protocol (PDCP) status report to the second transmitter of the target data unit, the operations comprising:

16. The communications device of claim 9, wherein the second receiver of the target data unit sends a packet data convergence protocol PDCP status report to the second transmitter of the target data unit if it is determined that the second communication link with the second transmitter of the target data unit is successful, and wherein the operations include:

17. A packet data convergence protocol status report sending device, comprising:

18. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to perform the method of any one of claims 1 to 8.