CN108282824B

CN108282824B - State updating method, node and user terminal

Info

Publication number: CN108282824B
Application number: CN201710006904.9A
Authority: CN
Inventors: 刘佳敏
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2017-01-05
Filing date: 2017-01-05
Publication date: 2020-03-06
Anticipated expiration: 2037-01-05
Also published as: CN108282824A

Abstract

The embodiment of the invention provides a state updating method, a node and a user terminal, wherein the method comprises the following steps: if the user terminal needs to be switched or reconfigured, the first node acquires the transmission state of a radio link layer control protocol (RLC) layer of the user terminal; and the first node updates the transmission state of a Packet Data Convergence Protocol (PDCP) layer of the user terminal based on the transmission state of the RLC layer. The embodiment of the invention can improve the network transmission efficiency.

Description

State updating method, node and user terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a state updating method, a node, and a user terminal.

Background

In the future development of the mobile communication system, in order to better meet the user requirements and greatly improve the network capacity and throughput, more transmission nodes must be introduced, that is, the future network can be understood as an ultra-dense network. In a super-dense network, the transmission nodes are closer to each other, and the frequency of switching between transmission nodes, cell switching within a transmission node, or mobility reconfiguration of a User Equipment (UE) is high. However, when the UE is currently switched or reconfigured, a large number of retransmissions exist between the transmission node and the UE, which results in low network transmission efficiency.

Disclosure of Invention

The invention aims to provide a state updating method, a node and a user terminal, which solve the problem of low network transmission efficiency.

In order to achieve the above object, an embodiment of the present invention provides a state updating method, including:

if the user terminal needs to be switched or reconfigured, the first node acquires the transmission state of a Radio Link Control (RLC) layer of the user terminal;

the first node updates the transmission state of a Packet Data Convergence Protocol (PDCP) layer of the user terminal based on the transmission state of the RLC layer.

Optionally, the first node is a centralized transmission node, and the acquiring, by the first node, the transmission state of the RLC layer of the user equipment includes:

and the centralized transmission node receives the transmission state of the RLC layer of the user terminal sent by the source distributed transmission node of the user terminal.

Optionally, if the source distributed transmission node has a bearer of an Acknowledged Mode (AM) of the user equipment, the transmission state of the RLC layer includes:

a first Sequence Number (SN) Number in a bearer of the AM, a second SN, an acknowledgement status of each data packet between the first SN and the second SN, a third SN, a fourth SN, and a reception status of each data packet between the third SN and the fourth SN;

the first SN is the SN of the next data packet to be transmitted, the second SN is the SN which confirms successful continuous transmission plus 1, the third SN is the highest SN which is correctly received in sequence or the highest SN plus 1, and the fourth SN is the highest SN of the received data packet in the receiving window or the highest SN plus 1.

Optionally, the acknowledgement status of each data packet between the first SN and the second SN includes fragmentation information;

the receiving condition of each data packet between the third SN and the fourth SN comprises segmentation information;

wherein the segmentation information comprises at least one of:

the starting position of the segment in the data unit, the segment length, and indication information of the last segment.

Optionally, if the source distributed transmission node has a bearer of the user equipment in acknowledged mode AM, the transmission state of the RLC layer includes:

the method includes the steps of receiving a first Acknowledgement (ACK) from a first SN of a data packet in a bearer of the AM, wherein the first SN is used for indicating the first ACK Acknowledgement and whether ACK Acknowledgement is received by a plurality of SN sending the data packet, and receiving ACK Acknowledgement by a plurality of SN sending the data packet.

Optionally, the transmission state of the RLC layer further includes: the segment transmitting apparatus includes first segment indication information indicating a segment which has been transmitted and received an ACK acknowledgement or a segment which has been transmitted but has not received an ACK acknowledgement, and second segment indication information indicating a segment which has been received or a segment which has not been received.

Optionally, if the source distributed transmission node has a bearer in an Unacknowledged Mode (UM) of the user equipment, the transmission state of the RLC layer includes:

the SN of the next data packet to be transmitted in the bearer of UM and the reception condition of the discontinuous reception, and further includes the highest SN received or the highest SN plus 1; wherein the receiving condition of the discontinuous reception comprises segmentation information, and the segmentation information comprises at least one of the following items:

Optionally, if the SN of the RLC layer and the common SN of the PDCP layer, the SN included in the transmission status of the RLC layer is the common SN of the RLC layer and the common SN of the PDCP layer; or

And if the SN of the RLC layer and the non-shared SN of the PDCP layer exist, the SN included in the transmission state of the RLC layer is the SN of the PDCP layer obtained by mapping the SN of the RLC layer by the source distributed transmission node.

Optionally, the transmission state of the RLC layer includes a segmentation confirmation condition and segmentation information, and the method further includes:

the centralized transmission node transmits the segmented data needing to be retransmitted to a target distributed transmission node of the user terminal based on the confirmation condition and the segmentation information of the segments; or

The centralized transmission node transmits the confirmation condition and the segmentation information of the segmentation to a target distributed transmission node of the user terminal, and the target distributed transmission node performs data segmentation and corresponding transmission; or

If the SN of the RLC layer and the shared SN of the PDCP layer are available, the centralized transmission node transmits a PDCP status report to a target distributed transmission node of the user terminal, wherein the PDCP status report comprises the segmented confirmation condition and the segmented information, and the target distributed transmission node uses the PDCP status report to synchronize the transmission status of the RLC layer; or

And if the SN of the RLC layer and the shared SN of the PDCP layer are both available, the centralized transmission node transmits the transmission state of the RLC layer of the source distributed transmission node to a target distributed transmission node of the user terminal, and the target distributed transmission node organizes an RLC state report and performs corresponding transmission.

Optionally, the first node includes a source node of an independent protocol stack, and the method further includes:

the source node forwards the transmission state of the PDCP layer to a target node of a target cell of the user terminal, wherein the transmission state of the PDCP layer comprises the following steps: receiving the segmentation and segmentation information, wherein the segmentation information comprises at least one of the following items:

Optionally, the transmission state of the PDCP layer further includes: a first data packet that has been sent but has not received an ACK acknowledgement, and/or an ACK acknowledgement for a plurality of subsequent data packets, and further comprising: the highest SN of the upper layer is submitted in sequence or the highest SN of the upper layer is submitted in sequence plus 1, and the receiving condition of the discontinuous receiving part is carried out.

Optionally, the receiving condition of the discontinuous reception part includes: and a bit stream for indicating the reception condition of each SN of the discontinuous reception section.

Optionally, the method further includes:

the source node forwards a first data packet which is sent but does not receive the ACK acknowledgement to the target node, and a plurality of data packets behind the first data packet;

if the part received discontinuously has segments, the source node forwards segmented data and corresponding segmented information to the target node.

Optionally, the method further includes:

the source node sends a switching preparation command to the target node, wherein the switching preparation command carries inquiry information for inquiring whether the target node supports and agrees to carry out segmented information forward forwarding;

and the source node receives a response message sent by the target node, wherein the response message is used for indicating that the target network node supports and agrees to carry out segmented information forwarding.

if the SN of the RLC layer shares the SN of the PDCP layer, the source node forwards the transmission state of the PDCP layer or the transmission state of the RLC layer to a target node of a target cell of the user terminal, wherein the transmission state of the PDCP layer is used for synchronizing the transmission state of the RLC layer of the target node, and the transmission state of the RLC layer is used for synchronizing the transmission state of the RLC layer of the target node.

Optionally, the transmission status of the PDCP layer includes a first data packet that has been sent but has not received an ACK acknowledgement, and/or ACK acknowledgement status of a plurality of subsequent data packets, and further includes a highest SN of a sequentially delivered higher layer or a highest SN of a sequentially delivered higher layer plus 1, and a reception status of a discontinuous reception part.

Optionally, the method further includes:

the source node forwards a first data packet which is sent but does not receive ACK confirmation to the target node and all subsequent data packets; or the source node forwards the first data packet which is sent but has not received the ACK acknowledgement to the target node, and then the data packet which is sent but has not received the ACK acknowledgement, and the data packet which is not transmitted;

the source node forwards a discontinuous reception part to the target node.

Optionally, the status report of the ue is sent by the RLC layer of the source node and/or the target node.

An embodiment of the present invention further provides a state updating method, including:

if the user terminal needs to be switched or reconfigured, the user terminal acquires the transmission state of an RLC layer of the user terminal;

and the user terminal updates the transmission state of the PDCP layer of the user terminal based on the transmission state of the RLC layer.

Optionally, the method further includes:

and the user terminal initializes the transmission state of the RLC layer.

Optionally, the method further includes:

and if the SN of the RLC layer and the shared SN of the PDCP layer, the user terminal uses the transmission state of the PDCP layer of the user terminal to synchronize the transmission state of the RLC layer.

Optionally, the method further includes:

the user terminal receives a command sent by a network side, wherein the command comprises indication information indicating whether SN of an RLC layer and SN of a PDCP layer share the same SN.

Optionally, the method further includes:

the user terminal receives a command sent by a network side, wherein the command comprises indication information whether the fragment-based data transmission is supported.

Optionally, the transmission status of the RLC layer includes an acknowledgement of segmentation and segmentation information, where the segmentation information includes at least one of the following:

Optionally, the method further includes:

the user terminal reserves the segmentation condition and segmentation information in the transmission state of the PDCP layer;

if the indication information indicates that segment-based data transmission is supported, the method further comprises:

and the user terminal synchronizes the segmentation condition and the segmentation information in the transmission state of the RLC layer.

Optionally, the synchronizing the transmission state of the RLC layer by using the transmission state of the PDCP layer of the user terminal includes:

if the user terminal has an AM bearer, for the AM bearer, the user terminal updates the next state boundary expected to be confirmed in the transmission states of the RLC layer to be the SN which confirms that the continuous transmission is successful plus 1 by using the transmission states of the PDCP layer of the user terminal, updates the next state boundary to be transmitted to be the SN of the next data packet to be transmitted, updates the boundary of a receiving window to be the highest SN of the data packet in the receiving window or the highest SN plus 1, and updates the sequentially received boundary to be the highest SN which is correctly received in sequence or the highest SN plus 1;

if the user terminal has a UM bearer, for the UM bearer, the user terminal updates a state boundary to be sent next in the transmission states of the RLC layer to be a SN of a data packet to be sent next by using the transmission state of the PDCP layer of the user terminal, and updates a sequentially received boundary to a highest SN correctly received in sequence or the highest SN plus 1.

An embodiment of the present invention further provides a node, where the node is a first node, and the node includes:

an obtaining module, configured to obtain a transmission state of a radio link layer control protocol RLC layer of a user equipment if the user equipment needs to perform handover or reconfiguration;

and the updating module is used for updating the transmission state of the packet data convergence protocol PDCP layer of the user terminal based on the transmission state of the RLC layer.

Optionally, the obtaining module is configured to receive a transmission state of an RLC layer of the user terminal sent by a source distributed transmission node of the user terminal.

Optionally, if the source distributed transmission node has a bearer of an acknowledged mode AM of the user equipment, the transmission state of the RLC layer includes:

a first SN, a second SN, an acknowledgement status of each data packet between the first SN and the second SN, a third SN, a fourth SN, and a reception status of each data packet between the third SN and the fourth SN in a bearer of the AM;

wherein the segmentation information comprises at least one of:

Optionally, if the source distributed transmission node has a bearer of the user terminal that is an AM, the transmission state of the RLC layer includes:

the method comprises the steps of receiving a first SN of a data packet which is sent but has not received an acknowledgement ACK acknowledgement in a bearer of the AM, receiving a first bit stream, receiving a first SN of a data packet which is not received, and receiving a second bit stream, wherein the first bit stream is used for indicating the first SN which has sent but has not received the ACK acknowledgement and whether a plurality of sent SNs receive the ACK acknowledgement or not, and the second bit stream is used for indicating the first SN which has not received and the plurality of SNs receive the acknowledgement.

Optionally, if the source distributed transmission node has a bearer of the UM of the user equipment, the transmission state of the RLC layer includes:

Optionally, the transmission state of the RLC layer includes a segmentation confirmation condition and segmentation information, and the node further includes:

a first transmission module, configured to transmit, to a target distributed transmission node of the user terminal, segment data that needs to be retransmitted based on the acknowledgement of the segment and the segment information; or

A second transmission module, configured to transmit segment confirmation and segment information to a target distributed transmission node of the user terminal, where the target distributed transmission node performs data segmentation and performs corresponding transmission; or

A third transmission module, configured to transmit a PDCP status report to a target distributed transmission node of the user equipment if the SN of the RLC layer and the common SN of the PDCP layer are the same, where the PDCP status report includes a confirmation of the segmentation and segmentation information, and the target distributed transmission node synchronizes a transmission status of the RLC layer by using the PDCP status report; or

And the fourth transmission module is used for transmitting the transmission state of the RLC layer of the source distributed transmission node to the target distributed transmission node of the user terminal if the SN of the RLC layer and the shared SN of the PDCP layer are available, organizing an RLC state report by the target distributed transmission node, and performing corresponding transmission.

Optionally, the first node includes a source node of an independent protocol stack, and the node further includes:

a first forwarding module, configured to forward a transmission state of the PDCP layer to a target node of a target cell of the user equipment, where the transmission state of the PDCP layer includes: receiving the segmentation and segmentation information, wherein the segmentation information comprises at least one of the following items:

Optionally, the node further includes:

the second forwarding module is used for forwarding the first data packet which is sent but does not receive the ACK acknowledgement to the target node and a plurality of data packets behind the first data packet;

and the third forwarding module is used for forwarding the segmented data and the corresponding segmented information to the target node if the part which is received discontinuously has segments.

Optionally, the node further includes:

a command sending module, configured to send a handover preparation command to the target node, where the handover preparation command carries inquiry information for inquiring whether the target node supports and agrees to perform segmented information forwarding;

and the response receiving module is used for receiving a response message sent by the target node, wherein the response message is used for indicating that the target network node supports and agrees to carry out segmented information forwarding.

a fourth forwarding module, configured to forward, to a target node of a target cell of the user terminal, a transmission state of the PDCP layer or a transmission state of the RLC layer if the SN of the RLC layer and the common SN of the PDCP layer are both used, where the transmission state of the PDCP layer is used to synchronize the transmission state of the RLC layer of the target node, and the transmission state of the RLC layer is used to synchronize the transmission state of the RLC layer of the target node.

Optionally, the node further includes:

a fifth forwarding module, configured to forward, to the target node, the first data packet that has been sent but has not received the ACK acknowledgment, and all subsequent data packets; or the source node forwards the first data packet which is sent but has not received the ACK acknowledgement to the target node, and then the data packet which is sent but has not received the ACK acknowledgement, and the data packet which is not transmitted;

a sixth forwarding module, configured to forward the discontinuous reception part to the target node.

An embodiment of the present invention further provides a user terminal, including:

an obtaining module, configured to obtain a transmission state of an RLC layer of the user equipment if the user equipment needs to perform handover or reconfiguration;

and the updating module is used for updating the transmission state of the PDCP layer of the user terminal based on the transmission state of the RLC layer.

Optionally, the user terminal further includes:

and the initialization module is used for initializing the transmission state of the RLC layer.

Optionally, the user terminal further includes:

and the first synchronization module is used for synchronizing the transmission state of the RLC layer by using the transmission state of the PDCP layer of the user terminal if the SN of the RLC layer and the shared SN of the PDCP layer.

Optionally, the user terminal further includes:

the first receiving module is used for receiving a command sent by a network side, wherein the command comprises indication information indicating whether SN of an RLC layer and SN of a PDCP layer share the same SN.

Optionally, the user terminal further includes:

and the second receiving module is used for receiving a command sent by the network side, wherein the command comprises indication information whether the fragment-based data transmission is supported.

Optionally, the user terminal further includes:

a reserving module, configured to reserve the segmentation condition and the segmentation information in a transmission state of the PDCP layer;

if the indication information indicates that segment-based data transmission is supported, the ue further includes:

a second synchronization module for synchronizing the segmentation status and the segmentation information in the transmission state of the RLC layer.

Optionally, the first synchronization module is configured to, if the user terminal has an AM bearer, update, for the AM bearer, a next state boundary expected to be confirmed in the transmission states of the RLC layer by using the transmission state of the PDCP layer of the user terminal to be a SN which confirms that continuous transmission is successful plus 1, update a next state boundary to be transmitted to be a SN of a next data packet to be transmitted, update a boundary of a reception window to be a highest SN of a data packet in the reception window or the highest SN plus 1, and update a sequentially received boundary to be a highest SN which is all correctly received in sequence or the highest SN plus 1;

the first synchronization module is further configured to, if the UM bearer exists in the user terminal, for the UM bearer, update a next SN of a data packet to be sent in a transmission state of the RLC layer to be a next SN of a data packet to be sent by using a transmission state of the PDCP layer of the user terminal, and update a sequentially received boundary to a highest SN that is correctly received in all sequences or a sum of the highest SN and 1.

The technical scheme of the invention at least has the following beneficial effects:

in the embodiment of the invention, if the user terminal needs to be switched or reconfigured, the first node acquires the transmission state of a radio link layer control protocol (RLC) layer of the user terminal; and the first node updates the transmission state of a Packet Data Convergence Protocol (PDCP) layer of the user terminal based on the transmission state of the RLC layer. Since the PDCP layer is updated based on the transmission status of the RLC layer, data that has been successfully transmitted in the RLC layer is not retransmitted, thereby improving the network transmission efficiency.

Drawings

FIG. 1 is a schematic diagram of a network architecture to which embodiments of the present invention are applicable;

FIG. 2 is a protocol diagram of a network architecture to which embodiments of the present invention are applicable;

FIG. 3 is a schematic diagram of another network architecture to which embodiments of the present invention are applicable;

fig. 4 is a flowchart of a status updating method according to an embodiment of the present invention;

FIG. 5 is a flowchart of another status updating method according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a node according to an embodiment of the present invention;

fig. 7 is a schematic diagram of another node according to an embodiment of the present invention;

fig. 8 is a schematic diagram of another node according to an embodiment of the present invention;

fig. 9 is a schematic diagram of another node according to an embodiment of the present invention;

fig. 10 is a schematic diagram of another node according to an embodiment of the present invention;

fig. 11 is a schematic diagram of another node according to an embodiment of the present invention;

fig. 12 is a schematic diagram of another node according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a user equipment according to an embodiment of the present invention;

fig. 14 is a schematic diagram of another ue according to an embodiment of the present invention;

fig. 15 is a schematic diagram of another ue according to an embodiment of the present invention;

fig. 16 is a schematic diagram of another ue according to an embodiment of the present invention;

fig. 17 is a schematic diagram of another ue according to an embodiment of the present invention;

fig. 18 is a schematic diagram of another ue according to an embodiment of the present invention;

fig. 19 is a schematic diagram of another node according to an embodiment of the present invention;

fig. 20 is a schematic diagram of another ue according to an embodiment of the present invention.

Detailed Description

Referring to fig. 1, fig. 1 is a schematic diagram of a network structure to which an embodiment of the present invention is applicable, and as shown in fig. 1, the network structure includes a User terminal (UE) 11, a centralized transmission node (CU) 12, a source distributed transmission node (DU) 13, and a target DU14, where CU12 may also be referred to as a first node in the embodiment of the present invention. The user terminal 11 may be a terminal side Device such as a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), or a Wearable Device (Wearable Device), and it should be noted that a specific type of the user terminal 11 is not limited in the embodiment of the present invention. The CU12 may be a node device including a PDCP Layer, and the source DU13 and the target DU14 may be node devices including an RLC Layer, a Media Access Control (MAC) Layer, and a Physical Layer (PHY), and the specific structure may be as shown in fig. 2, although, in the embodiment of the present invention, the CU12, the source DU13, and the target DU14 and the specific type are not limited.

In addition, another network structure diagram applicable to the embodiment of the present invention is shown in fig. 3, and includes a user terminal 31, a source node 32 and a target node 33, where the source node 32 and the target node 33 include node devices of independent protocol stacks, for example: the base station may be a macro station, such as an LTE eNB, a 5G NR NB, or a gNB; or a small station, such as a Low Power Node (LPN) pico, a femto, or an Access Point (AP); or may be a network node formed by a CU and a plurality of TRP (Transmission Reception Point) managed and controlled by the CU. In addition, one or more cells (e.g., different frequency bins or sector splits) are located under one base station. It should be noted that the specific types of the source node 32 and the target node 33 are not limited in the embodiment of the present invention.

Referring to fig. 4, an embodiment of the present invention provides a status updating method, as shown in fig. 4, including the following steps:

401. if the user terminal needs to be switched or reconfigured, the first node acquires the transmission state of the RLC layer of the user terminal;

402. and the first node updates the transmission state of the PDCP layer of the user terminal based on the transmission state of the RLC layer.

The user terminal may need to perform handover between different serving nodes, or may need to perform handover between different cells of the same serving node. The reconfiguration may be a mobility reconfiguration of the ue, or a reconfiguration determined by the network, and the embodiment of the present invention is not limited thereto. For example: based on a measurement report reported by a user terminal, or based on a measurement result of a network side, or based on other factors, such as load balancing between DUs, etc., a centralized transmission node body determines to switch the user terminal from a source distributed transmission node to a target distributed transmission node.

In addition, the first node may acquire the transmission state of the RLC layer of the user terminal through the source distributed transmission node of the user terminal, or the first node may acquire the transmission state of the RLC layer of the user terminal of the first node. The transmission state of the RLC layer may be a transmission state of uplink data and/or downlink data of the user terminal in the RLC layer.

The updating of the transmission status of the PDCP layer of the user terminal based on the transmission status of the RLC layer may be mapping the transmission status of the RLC layer of the user terminal into the transmission status of the PDCP layer.

In the above steps, since the PDCP layer is updated based on the transmission status of the RLC layer, data that has been successfully transmitted in the RLC layer is not retransmitted, thereby improving the network transmission efficiency.

As an optional implementation manner, the above first node is a centralized transmission node, and the acquiring, by the first node, the transmission state of the RLC layer of the user equipment includes:

In this embodiment, the method may be applied to the network structure shown in fig. 1, where the centralized transmission node receives the transmission status of the RLC layer of the user terminal sent by the source distributed transmission node, that is, the source distributed transmission node reports the RLC layer transmission status of the user terminal to the centralized transmission node.

It should be noted that, for the sending end, although the PDCP entity located in the centralized transmission node can obtain a certain RLC sending condition due to the existence of the flow control capability mechanism, the latest state at the time of switching is explicitly reported to the PDCP by the source distributed transmission node, which is convenient for the PDCP to perform the transmission and retransmission processing after switching.

Optionally, if the source distributed transmission node has a bearer of the AM of the user equipment, the transmission state of the RLC layer includes:

In this embodiment, it may be implemented that the first sequence number SN, the second SN, the acknowledgement status of each data packet between the first SN and the second SN, the third SN, the fourth SN, and the reception status of each data packet between the third SN and the fourth SN in the bearer of the AM are updated into the transmission status of the PDCP layer, so as to reduce retransmission of a successfully transmitted data packet.

wherein the segmentation information comprises at least one of:

the start position (SO) of the Segment in the data unit, the Segment length, and indication information of the last Segment.

The Data Unit may be a PDU (Protocol Data Unit, PDU), which is not limited, for example: other Data units such as Service Data Unit (SDU) may also be used. The above-mentioned segment Length may be a Length Indicator (LI), i.e., indicating the Length of the corresponding segment, and the indication information of the last segment indication may be indicating the last segment in the data unit. In this embodiment, the position of the Segment in the data unit is indicated by at least one of a start position (SO) of the Segment in the data unit, a Segment length, and indication information of a last Segment, SO that only segments which are not successfully received need to be transmitted between the user terminal and the destination node, and retransmission is not needed for segments which are successfully received, thereby improving transmission efficiency.

For example: the transmission status of the RLC layer carries the SN of the first data packet that has been sent but has not obtained an Automatic Repeat Request (ARQ) ACK acknowledgement, and carries a bit stream to indicate whether each SN sent thereafter receives an ACK acknowledgement, for example, the bit position corresponding to the received ACK acknowledgement is 1, otherwise, the bit stream is 0, until all the SNs that have been sent have been indicated. While for the case where fragmentation is acknowledged, fragmentation information may be carried. For example, currently, the first unacknowledged data packet SN is 100, which means that all data before 100 is correctly received and feedback ACK, several packets 100 and 105 are sent, but the acknowledgement situation is complicated, starting from 100, the first unacknowledged data packet is carried with SN 100, and the packet states of the next 5 packets are 11001, respectively, to indicate the acknowledgement situation of data packets with sequence numbers 101 and 105, and if there is a fragment acknowledged in these data packets, the data packets may carry fragment information, which may be the fragment information that has been acknowledged, or may carry unacknowledged fragment information.

In this embodiment, signaling overhead can be saved because the indication is performed by a bit stream.

Through the first segment indication information and the second segment indication information, which segments are successfully transmitted and which segments are failed to be transmitted can be clearly known, so that segment retransmission with successful transmission is avoided. In addition, in the embodiment of the present invention, in a general situation, for a receiving end, as soon as data received by an RLC layer can recombine a complete PDCP PDU, that is, the PDCP PDU is sent to a PDCP layer, a state of the received complete PDU can be grasped by the PDCP layer timely, but for a successfully received segment, the receiving end cannot know, so that when a user terminal switches, the successfully received PDCP PDU segments can be triggered to be sent to the PDCP layer, and with the forwarding of detailed information of a receiving state, including a segmentation condition, retransmission of the successfully received PDCP PDU segments can be avoided, so that transmission efficiency is reduced.

In this embodiment, when there is a bearer of the UM of the user terminal, the SN of the next data packet to be sent in the bearer of the UM of the user terminal and the receiving condition of the discontinuous reception that occurs may be obtained, and the received highest SN or the highest SN plus 1 may be further included, so that the transmission condition of the UM bearer of the user terminal may be clearly known, so as to avoid retransmission of a successfully transmitted data packet, and improve transmission efficiency.

In this embodiment, it can be achieved that each SN is the SN of the PDCP layer in the transmission state of the RLC layer, so that the PDCP layer correctly confirms the transmission state. The SN of the PDCP layer obtained by the source distributed transmission node mapping the SN of the RLC layer may be the SN of the PDCP layer mapped by the source distributed transmission node according to a mapping relationship between the SN of the RLC layer and the SN of the PDCP layer, which is obtained in advance.

The acknowledgement of the segment may be whether the segment is acknowledged by ACK. The segmentation information may refer to the segmentation information described in the above embodiments, and is not described herein again.

In this embodiment, for the centralized transmission node, the PDCP layer receives the status information delivered by the RLC layer, updates the receiving status, and during the handover, a configurable status report of the PDCP layer is sent out immediately to inform the user terminal of the uplink receiving condition. In this embodiment, the transmitting end may retransmit all data that has transmitted no acknowledgement at the destination transfer node, and then start sequentially transmitting all the data that has not been transmitted at the new node. Specifically, when the status report may include segment information, the retransmitted data may also be segment data. When the PDCP layer does not process segmentation, the segmentation information may be transmitted to the RLC layer of the new node, which performs segmentation transmission.

Wherein, the centralized transmission node transmits the segmented data to be retransmitted to the target distributed transmission node of the user terminal based on the acknowledgement and segmentation information of the segments, when the PDCP layer and the RLC layer each have their own SN and are respectively grouped, and when the PDCP layer only needs to retransmit part of the segments, the retransmitted segments are maintained only by the PDCP layer, that is, only the PDCP layer can see that the segments are some data segments, and for the RLC layer, the segments are processed in the same way as normal PDCP PDUs. Thus, for the RLC layer, the processing can be completely performed according to the existing flow. The receiving PDCP layer may resolve the segments from it, reassemble them to form complete SDUs, and deliver them to higher layers.

In addition, the centralized transmission node transmits the segmented confirmation condition and the segmented information to the target distributed transmission node of the user terminal, and the target distributed transmission node performs data segmentation and performs corresponding transmission, which may also be that, when the PDCP layer and the RLC layer have their own SNs and are packaged separately, the RLC layer needs to send the segmented information to the RLC layer because the data has a certain correspondence with the PDCP layer, and even the PDCP layer does not support direct segmentation, and the RLC layer performs final segmentation. That is, for the RLC receiving end, it can be seen that a piece of segmented data is sent, in this case, an explicit RLC sending end is needed to notify the receiving end of the procedure, or the RLC receiving end retains some piece of correct receiving information when it is reset, which indicates that other segments of the data have been correctly received and are not transmitted again, so as to ensure that the receiving status of the RLC can be updated normally.

If the SN of the RLC layer and the common SN of the PDCP layer, i.e., the RLC layer and the PDCP layer use the same SN, the PDCP layer and the RLC layer and the status are associated. When the interface performs data forwarding and state forwarding, the detailed segmentation receiving condition of the RLC layer can be carried in the form of SO, LI and the last segmentation indication, and the carrying mode can be single RLC state transfer or only PDCP layer state transfer, and then the target distributed transmission node can obtain the RLC state information correspondingly after receiving the PDCP state information, because the receiving state information of the two is the same at this time. When the status information of the RLC is updated correspondingly, only the segments which are not successfully received can be sent subsequently, and the RLC/PDCP assembles the segments belonging to the same data packet to form a complete data packet, and finally delivers the complete data packet to a higher layer in sequence. That is, in this embodiment, if the SN of the RLC layer and the common SN of the PDCP layer are present, it may be implemented to transmit a PDCP status report to a target distributed transmission node of the user terminal, where the PDCP status report includes the acknowledgement of the segmentation and the segmentation information, and the target distributed transmission node synchronizes the transmission status of the RLC layer using the PDCP status report, or a centralized transmission node transmits the transmission status of the RLC layer of the source distributed transmission node to the target distributed transmission node of the user terminal, and the target distributed transmission node organizes the RLC status report and performs corresponding transmission.

In this embodiment, the target distributed transmission node can transmit the data segment according to the segment confirmation condition and the segment information of the source distributed transmission node through the above steps, and retransmission of the successfully transmitted segment can be avoided, so as to improve transmission efficiency.

In an optional implementation, the first node includes a source node of an independent protocol stack, and the method further includes:

The receiving condition of the segment may be a receiving condition of the source node receiving uplink data sent by the user terminal, or a receiving confirmation condition when the source node sends downlink data to the user terminal, that is, whether the user terminal successfully receives the downlink data.

In the implementation mode, in a cross-node switching scene, each node has an independent protocol stack, and the nodes are connected through an interface. When the UE is switched from the source node to the target node, more detailed receiving and sending information can be obtained through the state information of the forward PDCP, and the receiving condition of the segmentation information can be carried, so that the condition that the UE is successfully sent to segment for retransmission again is avoided, and resources are saved.

The forwarding can be implemented on the network side through the transmission state of the PDCP layer, and for the downlink sending end, the forwarded state information may include ARQ acknowledgement conditions that sequentially carry all sent data packets starting from the first data packet that has not received an acknowledgement, for example, SN ═ 100 is the first data packet that has not received an ACK and then 5 packets are sent, and the ACK condition of each packet is, for example: 11001, wherein 1 represents receiving acknowledgement and 0 represents not receiving acknowledgement, of course if there is only the case that the fragment packet is acknowledged among these data packets, the acknowledged fragment information is displayed with additional SO, LI and the fragment information indicated by the last fragment, and similarly, the unacknowledged fragment information may be displayed. In addition, when the whole data packet is acknowledged, 1 is used to indicate that the whole data packet is acknowledged, and as long as there is a part of data packet that is not ACK, bit 0 is used and carries which segments have already been ACK or which segments have not been ACK in the extra field.

The forwarding can be realized at the network side through the transmission state of the PDCP layer, for an uplink receiving end, the sequential part of the received data packet is delivered to the high layer in sequence, the forwarding state information can contain the highest SN delivered to the high layer in sequence or the next part of the highest SN, the rest part which is received discontinuously can be forwarded to a target node and carries the corresponding PDCP SN, and if the part which is received discontinuously has segments, the forwarding can carry the segment information and the segmented data together, so that different segments can be correctly recombined into complete data at the target node. Correspondingly, when the network side sends the PDCP status report, the segmentation information can be carried in, which indicates which segments are successfully received and which segments are not successfully received, so as to avoid retransmission of the successfully received segments, thereby saving network resources.

In this embodiment, the reception of each SN in the discontinuous reception section is represented by a bit stream, so that signaling overhead can be reduced and network resources can be saved. The bit stream may be represented by 1 indicating successful reception and 0 indicating unsuccessful reception.

Optionally, the method further includes:

In this embodiment, the plurality of data packets may be all sequential data packets after the first data packet that has been sent but has not received the ACK acknowledgement, or the data packets that have been sent but have not received the ACK acknowledgement after the first data packet that has been sent but has not received the ACK acknowledgement, and the data packets that have not been transmitted. All the above sequential data packets may be data packets after the SN of the first data packet which has been sent but has not received the ACK acknowledgement, except the SN, that is, the SNs are ordered in sequence. In this embodiment, network side forwarding may be implemented, and for the downlink sending end, both the data packet that does not receive the acknowledgement and the data packet that has not been transmitted are forwarded to the target node, or all the data packets after the first data packet that does not receive the acknowledgement are forwarded.

In this embodiment, the forwarding of the first data packet that has been sent but has not received the ACK acknowledgement, the plurality of subsequent data packets, the segmented data and the corresponding segmented information can be realized through the above steps, so that the target node sends the data packet that has not been sent successfully to the user terminal, thereby avoiding the possibility that the target node misses the data and affects the service of the user terminal.

Optionally, the method further includes:

In this embodiment, the handover preparation command may be used to implement that the segmented information is forwarded only when the target network node supports and agrees to perform the segmented information forwarding, so as to avoid that the target network node does not support or agree to perform the segmented information forwarding, which brings unnecessary signaling waste, and achieve the purpose of node transmission resources.

In this embodiment, the above-mentioned segmented information forwarding may also be referred to as layer-two segmented information forwarding, that is, if the target node agrees to perform layer-two segmented information forwarding in the handover feedback signaling, then subsequently perform layer-two segmented information forwarding, that is, perform the forwarding provided by the embodiment of the present invention, otherwise, perform the forwarding according to the existing handover procedure, that is, only the PDCP entity performs state based on complete SDU forwarding, and all the other protocol layers are reset.

Generally, the forwarding can be performed by adding the segmentation information, and one of the following two conditions needs to be satisfied:

when switching between a source node and a target node, if the security parameters can be kept before and after switching, that is, the same security parameters can be used before and after switching, at the moment, the security operation is continuous, and the segments transmitted successfully from different nodes can be recombined, so that the segment information can be forwarded;

when switching is carried out between a source node and a target node, if security parameters need to be changed before and after switching, namely different security parameters are used before and after switching, at the moment, a security algorithm needs to be capable of independently carrying out security relief operation on segmented data packets, namely the security algorithms of the source node and the target node can support the security relief operation on segmented data, so that SDU segments after decryption from different base stations is completed before and after switching can be recombined;

when one of the above two conditions is not satisfied, it means that it is not possible to reassemble SDU fragments after decryption from different nodes before and after switching, and therefore the delivery segment information is not useful, and there is no need to select the delivery segment information.

As an optional implementation, the first node includes a source node of an independent protocol stack, and the method further includes:

In this embodiment, the transmission state of the PDCP layer or the transmission state of the RLC layer may be forwarded to the target node, so that the target node may synchronize the transmission state of the RLC layer of the target node, and when the UE moves between nodes, the continuity of the UE transmission state information is maintained, and the target node may provide a continuous transmission service based on the latest UE state, thereby avoiding the reset of all state information of the user terminal and the decrease of the transmission rate, and finally improving the network efficiency and the user experience.

In addition, in this embodiment, for the network side, when sending the handover preparation command to the target node, the source node may carry query information to query whether the target node supports and agrees to the common SN option, where the common SN indicates that the RLC layer and the PDCP layer share a SN. If the target node agrees to configure the public SN in the switching feedback signaling, the corresponding information forwarding is subsequently executed, otherwise, the forwarding is carried out according to the existing switching flow, namely, only the PDCP entity carries out the forwarding based on the complete SDU or the simplified forwarding, and the rest protocol layers are reset. In addition, the common SN may not need to be interacted through an interface, which means that the source node does not need to know, and the source node performs state and data forwarding according to its own algorithm, and if the target node supports the common SN, the RLC synchronization state is performed according to the common SN, otherwise, the RLC synchronization state is started from the initialization state according to the existing RLC. It is desirable that the interface interaction with this information is a further explicit condition, so that in the case that the target node supports the public SN, the source node can select a more detailed state and data forwarding manner instead of rough information forwarding, so as to improve the transmission efficiency.

In this embodiment, forwarding the first data packet that has been sent but has not received the ACK acknowledgement to the target node and/or the ACK acknowledgement of a plurality of data packets other than the first data packet that has been sent but has not received the ACK acknowledgement may be implemented. For example: the forwarding of the state information may include ARQ acknowledgement cases that sequentially carry all transmitted data packets starting from the first data packet that has not received an acknowledgement, for example, SN 100 is the first data packet that has not received an ACK, and 5 packets are transmitted later, for example, the ACK case of each packet is: 11001, where 1 represents an acknowledgement received and 0 represents no acknowledgement received. For the target node, if the SN of the first data packet without ACK is received and carries the ACK condition of each data packet sent in the following sequence, the target node may initialize the SN of the first data packet that has been sent but has not received the ACK acknowledgement to the state boundary (VT _ a) of the next expected acknowledgement of RLC, the state of each subsequent data packet may also be recorded, and after the data packet at the gap is acknowledged, the VT _ a may be sequentially updated, for example, in this example, the SN is 100, and then 11001, after the data packet with the SN of 100 is also acknowledged after the retransmission, the VT _ a may be updated to 103, that is, the next data packet that needs to be acknowledged is 103.

In the embodiment, the network side forwards, for the uplink receiving end, the sequence part of the received data packet is already submitted to the high layer in sequence, the forwarded state information needs to include the highest S N or the next of the highest SN which is submitted to the high layer in sequence, the rest part which is received discontinuously, can be forwarded to the target node and carries the corresponding PDCP SN, when the target node receives the discontinuously received data packets and the forwarding state information, the highest SN, or the next to the highest SN, of a higher layer is delivered in order first, for initializing the boundary of the RLC reception window (VR _ R), the variable is the next highest SN of a packet received in sequence, for other packets received discontinuously, SN information may be synchronized to the RLC in sequence, the RLC may initialize the boundaries of sequential reception (VR _ H) and the reception of each packet between VR _ R and VR _ H. The update may then continue based on the initialization condition.

The transmission state of the RLC layer of the target node is synchronized through the transmission state of the PDCP layer, so that the retransmission of the successful transmission can be reduced, and the omission of the data which does not receive the ACK confirmation can be avoided.

In this embodiment, the bit stream may indicate that an ACK is received by 1 and that no ACK is received by 0, and may save signaling overhead since the bit stream indicates the reception of each SN of the discontinuous reception section.

Optionally, the method further includes:

the source node forwards a discontinuous reception part to the target node.

In this embodiment, forwarding to the target node may be implemented for all sequential data packets of the first data packet that has been sent but has not received the ACK acknowledgement, where all sequential data packets may refer to data packets with SN after a data packet that has been sent but has not received the ACK acknowledgement.

In this embodiment, the foregoing steps can implement forwarding the first data packet that has been sent but has not received the ACK acknowledgement, and a plurality of data packets thereafter, and an intermittent receiving portion, so that the target node sends the data packet that has not been sent successfully to the user terminal, thereby avoiding the possibility that the target node misses data and affects the service of the user terminal.

The status report of the ue may be sent by the RLC layer of the target node, except for handover or reconfiguration of the ue. In this embodiment, if the SN of the RLC layer and the SN of the PDCP layer share each other, the status report of the user terminal can be directly transmitted in the RLC layer. In addition, when the user equipment performs handover or reconfiguration, the RLC layer of the source node and/or the target node may transmit the handover or reconfiguration. In this embodiment, since the status report of the user terminal is sent in the RLC layer, signaling interaction in the PDCP layer can be reduced, thereby saving resources in the higher layer.

It should be noted that, if the ue performs handover or configuration between different cells of the same node, the security parameters may be retained. In addition, because the source cell and the target cell are located in the same node, the forwarding between the cells can be completed without an interface process and realized through the network side, generally, all the states of the source cell can be used in the target cell, and attention is also needed to be paid, the RLC layer and the reset can be performed, and then the transmission state of the PDCP layer is synchronized with the transmission state of the RLC layer.

It should be noted that, in the embodiment of the present invention, various optional implementations described above may be implemented in combination with each other, or may be implemented separately, and the embodiment of the present invention is not limited thereto.

Referring to fig. 5, an embodiment of the present invention provides a status updating method, as shown in fig. 5, including the following steps:

501. if the user terminal needs to be switched or reconfigured, the user terminal acquires the transmission state of an RLC layer of the user terminal;

502. and the user terminal updates the transmission state of the PDCP layer of the user terminal based on the transmission state of the RLC layer.

For the transmission status of the RLC layer and the transmission status of the updated PDCP layer, reference may be made to corresponding descriptions in the embodiment shown in fig. 2, which is not described herein again, and the same beneficial effects may be achieved.

Optionally, the method further includes:

and the user terminal initializes the transmission state of the RLC layer.

Wherein initializing the transmission state of the RLC layer may be resetting the transmission state of the RLC layer. Of course, optionally, the method further comprises:

That is, when the SN of the RLC layer and the common SN of the PDCP layer share the SN, the UE may synchronize the transmission state of the RLC layer after initialization using the transmission state of the PDCP layer of the UE, and when the UE is handed over or reconfigured, the UE keeps the continuity of the transmission state information, thereby avoiding the reset of all the state information of the UE and the decrease of the transmission rate, and finally improving the network efficiency and the user experience.

Optionally, the method further includes:

The command may be a handover command or a reconfiguration command, which is not limited in this embodiment of the present invention. Of course, the embodiment of the present invention may also be implemented without the above command, that is, the user terminal defaults or recognizes the SN of the RLC layer and the common SN of the PDCP layer.

Optionally, the method further includes:

In this embodiment, the command may be the same command as the command in the above embodiment, that is, one command includes the two pieces of instruction information, and of course, different commands are also possible, which is not limited to this embodiment of the present invention.

The segment confirmation condition may be an AKC confirmation condition of the segment, and whether the segment is successfully received. In this embodiment, the PDCP can sequentially retransmit unacknowledged data and subsequent data according to the fragmentation status and the fragmentation information, wherein if there is fragmentation information that is already acknowledged, only the unacknowledged data belonging to the same data packet is retransmitted; in addition, the PDCP performs operations such as decryption on the received segments, and reassembles the newly received segments with the original segments to form complete data, which is delivered to the upper layer in sequence.

Optionally, the method further includes:

In this embodiment, it can be achieved that the segmentation and segmentation information are retained in the transmission state of the PDCP layer, and if the network side indicates that segmented data is based, the segmentation and segmentation information can be synchronized in the transmission state of the RLC layer to reduce retransmission of segments. In addition, in this embodiment, it is possible to implement both the SN of the RLC layer and the common SN of the PDCP layer.

if the user terminal has an AM bearer, for the AM bearer, the user terminal uses the transmission state of the PDCP layer of the user terminal to update the next acknowledgement-expecting state boundary (VT _ A variable) in the transmission state of the RLC layer to the SN which confirms that the continuous transmission is successful plus 1, and updates the next to-be-transmitted state boundary (VT _ S variable) to the SN of the next to-be-transmitted data packet, and updates the boundary (VR _ R variable) of a receiving window to the highest SN of the data packet in the receiving window or the highest SN plus 1, and updates the sequentially-received boundary (VR _ H) to the highest SN which is correctly received in sequence or the highest SN plus 1;

if the user terminal has a UM bearer, for the UM bearer, the user terminal uses the transmission state of the PDCP layer of the user terminal to update the next state boundary (VT _ US variable) to be transmitted in the transmission state of the RLC layer to be the SN of the next data packet to be transmitted, and updates the sequentially received boundary (VT _ UH variable) to the highest SN correctly received all in sequence or the highest SN plus 1.

So that subsequent ues continue to transmit based on the new state to reduce the retransmission of data. In addition, in the embodiment of the present invention, after the RLC synchronization status, a status report is sent to the peer end, for example: and a target node.

In addition, in the embodiment of the present invention, when the RLC and the PDCP share the SN, for the status of the downlink receiving end, the PDCP entity at the network side notifies the PDCP at the user terminal side through a similar status reporting process, and the PDCP at the user terminal side notifies the RLC again, or the status of the downlink receiving end is notified to the target node RLC (RLC of the target distributed transmission node) by the PDCP entity at the network side (for example, the PDCP entity of the centralized transmission node), and the status report is organized by the RLC of the target node, and the RLC transmitting end notifies the user terminal of the initial status of its reception, so that the ue continues from the specified status.

It should be noted that, this embodiment is used as an implementation of the user terminal corresponding to the embodiment shown in fig. 2, and specific implementation thereof may refer to the relevant description of the embodiment shown in fig. 2, and in order to avoid repeated description, this embodiment is not described again. In this embodiment, the network transmission efficiency can also be improved.

Referring to fig. 6, an embodiment of the present invention provides a node, where the node is a first node, and as shown in fig. 7, a node 600 includes the following modules:

an obtaining module 601, configured to obtain a transmission state of a radio link layer control protocol RLC layer of a user equipment if the user equipment needs to perform handover or reconfiguration;

an updating module 602, configured to update a transmission state of a packet data convergence protocol PDCP layer of the user equipment based on the transmission state of the RLC layer.

wherein the segmentation information comprises at least one of:

Optionally, the transmission status of the RLC layer includes a segment confirmation status and segment information, as shown in fig. 7, the node 600 further includes:

a first transmission module 603, configured to transmit, to a target distributed transmission node of the user terminal, segment data that needs to be retransmitted based on the acknowledgement of the segment and the segment information; or

A second transmission module 604, configured to transmit a segment confirmation and segment information to a target distributed transmission node of the user terminal, where the target distributed transmission node performs data segmentation and performs corresponding transmission; or

A third transmitting module 605, configured to transmit a PDCP status report to a target distributed transmission node of the user equipment if the SN of the RLC layer and the common SN of the PDCP layer are met, where the PDCP status report includes a confirmation of the segmentation and segmentation information, and the target distributed transmission node synchronizes a transmission status of the RLC layer by using the PDCP status report; or

A fourth transmission module 606, configured to transmit the transmission state of the RLC layer of the source distributed transmission node to the target distributed transmission node of the user terminal if the SN of the RLC layer and the common SN of the PDCP layer are the same, where the target distributed transmission node organizes an RLC state report and performs corresponding transmission.

Optionally, the first node includes a source node of an independent protocol stack, as shown in fig. 8, the node 600 further includes:

a first forwarding module 607, configured to forward a transmission state of the PDCP layer to a target node of a target cell of the user equipment, where the transmission state of the PDCP layer includes: receiving the segmentation and segmentation information, wherein the segmentation information comprises at least one of the following items:

Optionally, as shown in fig. 9, the node further includes:

a second forwarding module 608, configured to forward, to the target node, the first data packet that has been sent but has not received the ACK acknowledgement, and multiple subsequent data packets;

a third forwarding module 609, configured to forward segmented data and corresponding segmented information to the target node if the part that is received discontinuously has segments.

Optionally, as shown in fig. 10, the node 600 further includes:

a command sending module 6010, configured to send a handover preparation command to the target node, where the handover preparation command carries inquiry information for inquiring whether the target node supports and agrees to perform segmented information forwarding;

a response receiving module 6012, configured to receive a response message sent by the target node, where the response message is used to indicate that the target network node supports and agrees to perform the segmented information forwarding.

Optionally, the first node includes a source node of an independent protocol stack, as shown in fig. 11, and the node further includes:

a fourth forwarding module 6013, configured to forward, to a target node of a target cell of the user terminal, a transmission state of the PDCP layer or a transmission state of the RLC layer if the SN of the RLC layer and the common SN of the PDCP layer are different, where the transmission state of the PDCP layer is used to synchronize the transmission state of the RLC layer of the target node, and the transmission state of the RLC layer is used to synchronize the transmission state of the RLC layer of the target node.

Optionally, as shown in fig. 12, the node 600 further includes:

a fifth forwarding module 6014, configured to forward, to the target node, the first data packet that has been sent but does not receive the ACK, and all subsequent data packets; or the source node forwards the first data packet which is sent but has not received the ACK acknowledgement to the target node, and then the data packet which is sent but has not received the ACK acknowledgement, and the data packet which is not transmitted;

a sixth forwarding module 6015, configured to forward the discontinuous reception part to the target node.

It should be noted that, in this embodiment, the node 600 may be a first node in any implementation manner in the method embodiment of the present invention, and any implementation manner of the first node in the method embodiment of the present invention may be implemented by the node 600 in this embodiment, so as to achieve the same beneficial effects, and details are not described here.

Referring to fig. 13, an embodiment of the present invention provides a user terminal, and as shown in fig. 13, a user terminal 1300 includes the following modules:

an obtaining module 1301, configured to obtain a transmission state of an RLC layer of the user equipment if the user equipment needs to perform handover or reconfiguration;

an updating module 1302, configured to update a transmission status of a PDCP layer of the user terminal based on the transmission status of the RLC layer.

Optionally, as shown in fig. 14, the user terminal 1300 further includes:

an initializing module 1303, configured to initialize a transmission state of the RLC layer.

Optionally, as shown in fig. 15, the user terminal 1300 further includes:

a first synchronization module 1304, configured to synchronize a transmission state of the RLC layer using the transmission state of the PDCP layer of the user terminal if the SN of the RLC layer and the common SN of the PDCP layer are the same.

Optionally, as shown in fig. 16, the user terminal 1300 further includes:

a first receiving module 1305, configured to receive a command sent by a network side, where the command includes indication information indicating whether a SN of an RLC layer and a SN of a PDCP layer share a SN.

Optionally, as shown in fig. 17, the user terminal 1300 further includes:

a second receiving module 1306, configured to receive a command sent by the network side, where the command includes indication information of whether segment-based data transmission is supported.

Optionally, as shown in fig. 18, the user terminal 1300 further includes:

a reserving module 1307, configured to reserve the segmentation condition and the segmentation information in a transmission state of the PDCP layer;

a second synchronization module 1308 for synchronizing the segmentation status and the segmentation information in the transmission state of the RLC layer.

Optionally, the first synchronization module 1304 is configured to, for an AM bearer, update a next state boundary expected to be confirmed in the transmission states of the RLC layer to be a SN that confirms that continuous transmission is successful plus 1, update a next state boundary to be transmitted to be a SN of a next data packet to be transmitted, update a boundary of a reception window to be a highest SN of the data packets in the reception window or the highest SN plus 1, and update a sequentially received boundary to be a highest SN that is correctly received all in sequence or the highest SN plus 1, using the transmission state of the PDCP layer of the user terminal;

the first synchronization module 1304 is further configured to, if the UM bearer exists in the user terminal, for the UM bearer, update a next SN of a data packet to be sent in a transmission state of the RLC layer to be a next SN of a data packet to be sent using a transmission state of the PDCP layer of the user terminal, and update a sequentially received boundary to a highest SN correctly received in all sequences or a sum of the highest SN and 1.

It should be noted that, in this embodiment, the user terminal 1300 may be a user terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the user terminal in the method embodiment of the present invention may be implemented by the user terminal 1300 in this embodiment, and the same beneficial effects are achieved, and details are not described here.

Referring to fig. 19, an embodiment of the present invention provides another node structure, where the node is a first node, and the node includes: a processor 1900, a transceiver 1910, a memory 1920, a user interface 1930, and a bus interface, wherein:

the processor 1900, which reads the program in the memory 1920, executes the following processes:

if the user terminal needs to be switched or reconfigured, the first node acquires the transmission state of the RLC layer of the user terminal;

and the first node updates the transmission state of the PDCP layer of the user terminal based on the transmission state of the RLC layer.

Among other things, transceiver 1910 is configured to receive and transmit data under the control of processor 1900.

In FIG. 19, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1900 and various circuits of memory represented by memory 1920 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 1910 may be multiple elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. User interface 1930 may also be an interface to connect externally to a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1900 is responsible for managing the bus architecture and general processing, and the memory 1920 may store data used by the processor 1900 when performing operations.

wherein the segmentation information comprises at least one of:

the method comprises the steps of sending a first sent but not received SN of a data packet acknowledged by ACK, sending a first bit stream, sending a first un-received SN of the data packet, and sending a second bit stream, wherein the first bit stream is used for indicating the first sent but not received SN of the data packet and whether a plurality of sent SNs receive ACK acknowledgement or not, and the second bit stream is used for indicating the first un-received SN and a plurality of SN receiving situations.

Optionally, the transmission status of the RLC layer includes an acknowledgement of segmentation and segmentation information, and the processor 1900 is further configured to:

transmitting the segmented data needing to be retransmitted to a target distributed transmission node of the user terminal through a transceiver 1910 based on the acknowledgement condition and the segmentation information of the segments; or

Transmitting the segment confirmation and segment information to a target distributed transmission node of the user terminal through a transceiver 1910, and performing data segmentation and corresponding transmission by the target distributed transmission node; or

If the SN of the RLC layer and the common SN of the PDCP layer are present, transmitting a PDCP status report to a target distributed transmission node of the user terminal through a transceiver 1910, where the PDCP status report includes an acknowledgement of the segmentation and segmentation information, and synchronizing a transmission status of the RLC layer by the target distributed transmission node using the PDCP status report; or

If the SN of the RLC layer and the common SN of the PDCP layer are present, the transmission state of the RLC layer of the source distributed transmission node is transmitted to the target distributed transmission node of the user terminal through the transceiver 1910, and the target distributed transmission node organizes an RLC state report and performs corresponding transmission.

Optionally, the first node comprises a source node of an independent protocol stack, and the processor 1900 is further configured to:

forwarding, by a transceiver 1910, a transmission state of the PDCP layer to a target node of a target cell of the user terminal, wherein the transmission state of the PDCP layer includes: receiving the segmentation and segmentation information, wherein the segmentation information comprises at least one of the following items:

Optionally, the processor 1900 is further configured to:

forwarding a first transmitted packet, and a plurality of packets thereafter, to the target node via transceiver 1910, wherein the first packet has been transmitted but has not received an ACK acknowledgement;

Optionally, the processor 1900 is further configured to:

sending a handover preparation command to the target node through a transceiver 1910, wherein the handover preparation command carries inquiry information for inquiring whether the target node supports and agrees to perform segmented information forwarding;

and receiving a response message sent by the target node through a transceiver 1910, where the response message is used to indicate that the target network node supports and agrees to perform segmented information forwarding.

if the SN of the RLC layer and the common SN of the PDCP layer are present, forwarding, by a transceiver 1910, a transmission state of the PDCP layer or a transmission state of the RLC layer to a target node of a target cell of the user terminal, where the transmission state of the PDCP layer is used to synchronize the transmission state of the RLC layer of the target node, and the transmission state of the RLC layer is used to synchronize the transmission state of the RLC layer of the target node.

Optionally, the processor 1900 is further configured to:

forwarding to the target node, via transceiver 1910, the first data packet that has been sent but for which no ACK acknowledgement has been received, and all subsequent data packets; or the source node forwards the first data packet which is sent but has not received the ACK acknowledgement to the target node, and then the data packet which is sent but has not received the ACK acknowledgement, and the data packet which is not transmitted;

a discontinuous reception portion is forwarded to the target node via transceiver 1910.

It should be noted that, the node in this embodiment may be the first node in any implementation manner in the method embodiment in the embodiment of the present invention, and any implementation manner of the first node in the method embodiment in the embodiment of the present invention may be implemented by the node in this embodiment, and the same beneficial effects are achieved, and details are not described here.

Referring to fig. 20, there is shown a structure of a user terminal including: a processor 2000, a transceiver 2010, a memory 2020, a user interface 2030, and a bus interface, wherein:

the processor 2000, which is used to read the program in the memory 2020, executes the following processes:

if the user terminal needs to be switched or reconfigured, acquiring the transmission state of an RLC layer of the user terminal;

and updating the transmission state of the PDCP layer of the user terminal based on the transmission state of the RLC layer.

Among other things, a transceiver 2010 for receiving and transmitting data under the control of the processor 2000.

In fig. 20, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 2000, and various circuits, represented by memory 2020, 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 2010 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. The user interface 2030 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 2000 is responsible for managing the bus architecture and general processing, and the memory 2020 may store data used by the processor 2000 in performing operations.

Optionally, the processor 2000 is further configured to:

initializing a transmission state of the RLC layer.

Optionally, the processor 2000 is further configured to:

and if the SN of the RLC layer and the shared SN of the PDCP layer, synchronizing the transmission state of the RLC layer by using the transmission state of the PDCP layer of the user terminal.

Optionally, the processor 2000 is further configured to:

a command sent by the network side is received through the transceiver 2010, and the command includes indication information indicating whether the SN of the RLC layer and the SN of the PDCP layer share the SN.

Optionally, the processor 2000 is further configured to:

the transceiver 2010 receives a command transmitted by the network side, the command including indication information whether segment-based data transmission is supported.

Optionally, the processor 2000 is further configured to:

reserving the segmentation condition and segmentation information in a transmission state of the PDCP layer;

if the indication information indicates that segment-based data transmission is supported, the processor 2000 is further configured to:

synchronizing the segmentation status and segmentation information in the transmission state of the RLC layer.

if the user terminal has an AM bearer, for the AM bearer, updating a next expected acknowledgement state boundary in the transmission states of the RLC layer to be the SN which confirms that continuous transmission is successful plus 1 by using the transmission state of the PDCP layer of the user terminal, updating a next to-be-transmitted state boundary to be the SN of a next to-be-transmitted data packet, updating the boundary of a receiving window to be the highest SN of the data packet in the receiving window or the highest SN plus 1, and updating the sequentially-received boundary to be the highest SN which is correctly received in sequence or the highest SN plus 1;

if the user terminal has a UM bearer, for the UM bearer, updating the state boundary to be sent next in the transmission states of the RLC layer to be the SN of the next data packet to be sent by using the transmission states of the PDCP layer of the user terminal, and updating the sequentially received boundary to be the highest SN which is correctly received in sequence or the highest SN plus 1.

It should be noted that, in this embodiment, the user terminal may be a user terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the user terminal in the method embodiment of the present invention may be implemented by the network side device in this embodiment, and the same beneficial effects are achieved, and details are not described here.

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 can be realized in a form of hardware, or in a 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 to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transceiving method according to various 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

1. A method for updating a state, comprising:

if the user terminal needs to be switched or reconfigured, the first node acquires the transmission state of a radio link layer control protocol (RLC) layer of the user terminal;

the first node updates the transmission state of a Packet Data Convergence Protocol (PDCP) layer of the user terminal based on the transmission state of the RLC layer;

the acquiring, by the first node, a transmission state of an RLC layer of the user equipment, where the first node is a centralized transmission node, includes:

the centralized transmission node receives the transmission state of the RLC layer of the user terminal sent by the source distributed transmission node of the user terminal;

if the source distributed transmission node has the bearer of the acknowledged mode AM of the user equipment, the transmission state of the RLC layer includes:

the first SN is the SN of the next data packet to be sent, the second SN is the SN for confirming successful continuous sending plus 1, the third SN is the highest SN which is received correctly in sequence or the highest SN plus 1, and the fourth SN is the highest SN of the received data packet in the receiving window or the highest SN plus 1;

or, if the source distributed transmission node has a bearer of the user equipment in acknowledged mode AM, the transmission state of the RLC layer includes:

2. The method of claim 1, wherein the acknowledgement status of each data packet between the first SN to the second SN comprises fragmentation information;

wherein the segmentation information comprises at least one of:

3. The method of claim 1, wherein the transmission state of the RLC layer further comprises: the segment transmitting apparatus includes first segment indication information indicating a segment which has been transmitted and received an ACK acknowledgement or a segment which has been transmitted but has not received an ACK acknowledgement, and second segment indication information indicating a segment which has been received or a segment which has not been received.

4. The method of claim 1, wherein if the source distributed transmission node has a bearer for unacknowledged mode UM of the user terminal, the transmission state of the RLC layer comprises:

5. The method according to any of claims 1-4, wherein if the SN of the RLC layer and the common SN of the PDCP layer, the SN included in the transmission status of the RLC layer is the SN of the RLC layer and the common SN of the PDCP layer; or

6. The method of any of claims 1-4, wherein the transmission state of the RLC layer includes acknowledgement of segmentation and segmentation information, the method further comprising:

7. The method of claim 1, wherein the first node comprises a source node of an independent protocol stack, the method further comprising:

8. The method of claim 7, wherein the transmission state of the PDCP layer further comprises: a first data packet that has been sent but has not received an ACK acknowledgement, and/or an ACK acknowledgement for a plurality of subsequent data packets, and further comprising: the highest SN of the upper layer is submitted in sequence or the highest SN of the upper layer is submitted in sequence plus 1, and the receiving condition of the discontinuous receiving part is carried out.

9. The method of claim 8, wherein the receiving of the discontinuous reception portion comprises: and a bit stream for indicating the reception condition of each SN of the discontinuous reception section.

10. The method of claim 9, wherein the method further comprises:

11. The method of any of claims 7 to 10, further comprising:

12. The method of claim 1, wherein the first node comprises a source node of an independent protocol stack, the method further comprising:

13. The method of claim 12, wherein the transmission status of the PDCP layer comprises ACK status of a first data packet which has been transmitted but has not received ACK acknowledgement and/or a plurality of subsequent data packets, and further comprises sequentially delivering the highest SN of a higher layer or sequentially delivering the highest SN of a higher layer plus 1, and receiving status of a discontinuous reception part.

14. The method of claim 13, wherein the receiving of the discontinuous reception portion comprises: and a bit stream for indicating the reception condition of each SN of the discontinuous reception section.

15. The method of claim 12, wherein the method further comprises:

the source node forwards a discontinuous reception part to the target node.

16. The method according to any of claims 12-15, wherein the status report at the user terminal is sent by the RLC layer of the source node and/or the target node.

17. A method for updating a state, comprising:

the user terminal updates the transmission state of the PDCP layer of the user terminal based on the transmission state of the RLC layer;

wherein, if the source distributed transmission node of the user terminal has a bearer of an acknowledged mode AM of the user terminal, the transmission state of the RLC layer includes:

or, if the source distributed transmission node of the user terminal has a bearer of the user terminal that is in an acknowledged mode AM, the transmission state of the RLC layer includes:

18. The method of claim 17, wherein the method further comprises:

and the user terminal initializes the transmission state of the RLC layer.

19. The method of claim 18, wherein the method further comprises:

20. The method of claim 19, wherein the method further comprises:

21. The method of any one of claims 17-19, further comprising:

22. The method of claim 21, wherein the transmission status of the RLC layer comprises segmentation acknowledgement and segmentation information, wherein the segmentation information comprises at least one of:

23. The method of claim 22, wherein the method further comprises:

24. The method of claim 19, wherein the synchronizing the transmission state of the RLC layer using the transmission state of the PDCP layer of the user terminal comprises:

25. A network node, the node being a first node, comprising:

an updating module, configured to update a transmission state of a packet data convergence protocol PDCP layer of the user equipment based on the transmission state of the RLC layer;

the acquisition module is used for receiving the transmission state of the RLC layer of the user terminal sent by a source distributed transmission node of the user terminal;

alternatively, the first and second electrodes may be,

if the source distributed transmission node has the bearer of the user terminal, which is AM, the transmission state of the RLC layer includes:

26. The node of claim 25, wherein the acknowledgement status of each data packet between the first SN to the second SN comprises fragmentation information;

wherein the segmentation information comprises at least one of:

27. The node of claim 25, wherein the transmission state of the RLC layer further comprises: the segment transmitting apparatus includes first segment indication information indicating a segment which has been transmitted and received an ACK acknowledgement or a segment which has been transmitted but has not received an ACK acknowledgement, and second segment indication information indicating a segment which has been received or a segment which has not been received.

28. The node of claim 25, wherein if the source distributed transmission node has a bearer of UM for the user terminal, the transmission status of the RLC layer comprises:

29. The node according to any of claims 25-28, wherein if the SN of the RLC layer and the common SN of the PDCP layer, the SN included in the transmission status of the RLC layer is the SN of the RLC layer and the common SN of the PDCP layer; or

30. The node according to any of claims 25-28, wherein the transmission state of the RLC layer comprises acknowledgement of segmentation and segmentation information, the node further comprising:

31. The node of claim 25, wherein the first node comprises a source node of an independent protocol stack, the node further comprising:

32. The node of claim 31, wherein the transmission state of the PDCP layer further comprises: a first data packet that has been sent but has not received an ACK acknowledgement, and/or an ACK acknowledgement for a plurality of subsequent data packets, and further comprising: the highest SN of the upper layer is submitted in sequence or the highest SN of the upper layer is submitted in sequence plus 1, and the receiving condition of the discontinuous receiving part is carried out.

33. The node of claim 32, wherein the reception of the discontinuous reception portion comprises: and a bit stream for indicating the reception condition of each SN of the discontinuous reception section.

34. The node of claim 32, wherein the node further comprises:

35. The node according to any of claims 31 to 34, wherein the node further comprises:

36. The node of claim 25, wherein the first node comprises a source node of an independent protocol stack, the node further comprising:

37. The node according to claim 36, wherein the transmission status of the PDCP layer includes ACK status of a first data packet which has been sent but has not received ACK acknowledgement and/or a plurality of subsequent data packets, and further includes sequentially submitting the highest SN of a higher layer or sequentially submitting the highest SN of a higher layer plus 1, and receiving status of a discontinuous reception part.

38. The node of claim 37, wherein the reception of the discontinuous reception portion comprises: and a bit stream for indicating the reception condition of each SN of the discontinuous reception section.

39. The node of claim 36, wherein the node further comprises:

40. The node according to any of claims 36-39, wherein the status report at the user terminal is sent by the RLC layer of the source node and/or the target node.

41. A user terminal, comprising:

an updating module, configured to update a transmission state of a PDCP layer of the user terminal based on the transmission state of the RLC layer;

42. The user terminal of claim 41, wherein the user terminal further comprises:

43. The user terminal of claim 42, wherein the user terminal further comprises:

44. The user terminal of claim 43, wherein the user terminal further comprises:

45. The user terminal according to any of claims 41-43, wherein the user terminal further comprises:

46. The user terminal of claim 45, wherein the transmission status of the RLC layer includes an acknowledgement of segmentation and segmentation information, wherein the segmentation information includes at least one of:

47. The user terminal of claim 46, wherein the user terminal further comprises:

48. The ue of claim 43, wherein the first synchronization module is configured to update, for an AM bearer, a next expected acknowledgement status boundary in the transmission statuses of the RLC layer of the ue with the transmission status of the PDCP layer of the ue as the SN of the acknowledged successful consecutive transmission plus 1, and update a next to-be-transmitted status boundary as the SN of a next to-be-transmitted packet, and update a boundary of a reception window as the highest SN of a packet within the reception window or the highest SN plus 1, and update sequentially received boundaries as the highest SN of all correctly received packets in sequence or the highest SN plus 1, if the AM bearer exists for the ue;