WO2019134496A1

WO2019134496A1 - Data transmission method and communication device

Info

Publication number: WO2019134496A1
Application number: PCT/CN2018/121473
Authority: WO
Inventors: 孙军帅; 王莹莹; 黄学艳; 韩星宇
Original assignee: 中国移动通信有限公司研究院; 中国移动通信集团有限公司
Priority date: 2018-01-05
Filing date: 2018-12-17
Publication date: 2019-07-11
Also published as: CN110012506B; CN110012506A

Abstract

The embodiments of the present disclosure provide a data transmission method and a communication device. The data transmission method comprising: an L2 layer of a first device receiving at least one data packet; and the L2 layer mapping the received at least one data packet to a plurality of transmission channels, and sending same to a second device. Said method may further comprise: the L2 layer of the first device receiving, from the plurality of transmission channels, the at least one data packet sent by the second device; and sorting the at least one data packet, and sending, according to an order specified by the second device, the sorted at least one data packet to an upper layer of the first device.

Description

Data transmission method and communication device

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201810009456.2, filed on Jan. 5, s.

Technical field

The present disclosure relates to the field of communications, and in particular to a data transmission method and communication device.

Background technique

A dual connection is introduced in 4G, and the service data packet and the signaling data packet are implemented by a split data bearer (split DRB) and a split signaling radio bearer (split SRB) of a Packet Data Convergence Protocol (PDCP). Dual link transceiver.

In the 5G, the Service Data Adaptation Protocol (SDAP) protocol layer is introduced. The main function of the SDAP protocol layer is to implement the service data adaptation layer protocol function.

In 5G, dual connectivity is not only preserved, but functionality is enhanced. In the subsequent evolution of 5G, even in the next generation of mobile communication systems, more than dual connectivity multiple connections will inevitably be widely used.

However, there is no solution in the related art for multi-connection channels in which data packets are mapped to air ports in 5G.

Summary of the invention

A data transmission method includes:

The L2 layer of the first device receives at least one data packet;

The L2 layer maps the received at least one data packet to a plurality of transmission channels and transmits to the second device.

The step of receiving the at least one data packet by the L2 layer includes:

The L2 layer receives at least one service data packet or signaling data packet from the upper layer.

The step of receiving, by the L2 layer, the at least one service data packet or the signaling data packet from the upper layer includes:

The L2 layer receives at least one service data packet from the core network or the application layer; or

The L2 layer receives at least one signaling data packet from the radio link control RRC sublayer of the L3 layer.

The L2 layer service data adaptation protocol SDAP sublayer or packet data convergence protocol PDCP sublayer receives at least one service data packet or signaling data packet from the upper layer.

The step of the L2 layer mapping the received at least one data packet to the multiple transmission channels and sending the data to the second device includes:

The SDAP sublayer or the PDCP sublayer of the L2 layer maps the received at least one data packet to the plurality of radio bearers RB according to the transmission order of the data packet, and sends the data to the second device.

The step of transmitting the received at least one data packet to the plurality of radio bearers RB according to the transmission order of the data packet, and transmitting the packet to the second device, includes:

When the data packet is a service data packet, the received at least one service data packet is mapped to one or more data radio bearers DRB according to a transmission sequence of the specified data packet, and sent to the second device; or

When the data packet is a signaling data packet, the received at least one signaling data packet is mapped to one or more signaling radio bearers SRB according to a transmission sequence of the specified data packet, and is sent to the second device. send.

The transmission order of the data packet includes: an increasing order of the sequence numbers of the received data packets, a descending order, or a random order.

The SDAP sublayer or the PDCP sublayer of the L2 layer, when the received at least one data packet is mapped to multiple radio bearers RB according to the transmission order of the data packet, the data packet and the radio bearer carrying the data packet The mapping relationship of the RB is configured by the RRC signaling of the RRC sublayer controlled by the radio link of the L3 layer;

The mapping relationship includes: one data packet is mapped to a configured RB for transmission, or one data packet is mapped to a target RB for transmission, and the target RB is one of the plurality of RBs.

The data transmission method further includes:

The L2 layer of the first device receives at least one data packet sent by the second device from the multiple transmission channels;

And sorting the at least one data packet according to an order specified by the second device, and obtaining the sorted at least one data packet, and sending the data packet to the upper layer of the first device.

The step of receiving, by the L2 layer of the first device, the at least one data packet sent by the second device from the multiple transmission channels includes:

The L2 layer of the first device receives at least one service data packet or signaling data packet sent by the second device from the multiple transmission channels.

The step of receiving, by the L2 layer of the first device, the at least one service data packet or the signaling data packet sent by the second device from the multiple transmission channels includes:

The service data adaptation protocol SDAP sublayer or the packet data convergence protocol PDCP sublayer of the L2 layer of the first device receives at least one service data packet or signaling data packet sent by the second device from the plurality of transmission channels.

The step of recovering the at least one data packet in the order specified by the second device, and obtaining the sorted at least one data packet, and sending the message to the upper layer of the first device includes:

When the data packet is a service data packet, at least one service data packet received from one or more data radio bearers DRB is restored and sorted according to an order specified by the second device, and the sorted at least one service data packet is obtained. And sent to the upper layer of the first device; or

When the data packet is a signaling data packet, at least one signaling data packet received from one or more signaling radio bearers SRB is restored and sorted according to an order specified by the second device, and at least one sorted is obtained. Signaling the data packet and sending it to the upper layer of the first device.

Retrieving the at least one data packet in an order specified by the second device, obtaining the sorted at least one data packet, and routing the sorted at least one data packet to a corresponding quality of service flow QoS Flow And sent to the upper layer of the first device; or

And sorting the at least one data packet according to the order of the radio bearer RBs and the order specified by the second device, obtaining the sorted at least one data packet, and distributing the sorted data packets to each corresponding service quality stream. QoS Flow is sent to the upper layer of the first device.

An embodiment of the present disclosure further provides a communication device, including:

And a transceiver, configured to receive at least one data packet at the L2 layer; and map the received at least one data packet to multiple transmission channels, and send the data to the second device.

The transceiver is specifically configured to receive at least one service data packet or signaling data packet from an upper layer at the L2 layer.

The transceiver is specifically configured to receive at least one service data packet from the core network at the L2 layer, or receive at least one signaling data packet from the radio link control RRC sublayer of the L3 layer.

The transceiver is located in a service data adaptation protocol SDAP sublayer or a packet data convergence protocol PDCP sublayer of the L2 layer.

The transceiver maps the received at least one data packet to a plurality of radio bearers RB according to a transmission sequence of the data packet, and sends the data packet to the second device.

Wherein, when the data packet is a service data packet, the transceiver maps the received at least one service data packet to one or more data radio bearers DRB according to a transmission sequence of the specified data packet, and The second device sends; or

When the data packet is a signaling data packet, the transceiver maps the received at least one signaling data packet to one or more signaling radio bearers SRB according to a transmission sequence of the specified data packet, and Send to the second device.

The mapping between the data packet and the radio bearer RB carrying the data packet is performed by the L3 layer, when the transceiver maps the received at least one data packet to a plurality of radio bearers RB according to a transmission sequence of the data packet. Radio link control RRC signaling configuration of the RRC sublayer;

The transceiver is further configured to: receive, on the L2 layer, at least one data packet sent by the second device from the multiple transmission channels; and restore the at least one data packet according to an order specified by the second device, The sorted at least one data packet is obtained and sent to the upper layer of the first device.

The transceiver is specifically configured to receive, by using a plurality of transmission channels, at least one service data packet or a signaling data packet sent by the second device.

The transceiver is located in a service data adaptation protocol SDAP sublayer or a packet data convergence protocol PDCP sublayer of the L2 layer of the communication device.

Wherein, when the data packet is a service data packet, the transceiver recovers and sorts at least one service data packet received from one or more data radio bearers DRB according to an order specified by the second device, and after being sorted, At least one service data packet and sent to the upper layer of the first device; or

When the data packet is a signaling data packet, the transceiver recovers and sorts at least one signaling data packet received from one or more signaling radio bearers SRB according to an order specified by the second device. The latter at least one signaling packet is sent to the upper layer of the first device.

The transceiver is specifically configured to: restore the at least one data packet according to an order specified by the second device, obtain the sorted at least one data packet, and route the sorted at least one data packet. Go to the corresponding quality of service flow QoS Flow and send it to the upper layer of the first device; or

Embodiments of the present disclosure also provide a communication device comprising: a processor, a memory storing a computer program, and when the computer program is executed by the processor, performing the method as described above.

Embodiments of the present disclosure also provide a computer readable storage medium comprising instructions that, when executed by a computer, cause a computer to perform the method as described above.

DRAWINGS

1 is a flowchart of a data transmission method according to an embodiment of the present disclosure;

2 is a schematic structural diagram of a solution for implementing multi-connection mapping of a first device and a second device;

3 is a schematic structural diagram of a data transmission method of the present disclosure implemented in a SDAP sublayer of an L2 layer;

FIG. 4 is a schematic structural diagram of a data transmission method of the present disclosure implemented in a PDCP sublayer of an L2 layer.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been shown in the drawings, the embodiments Rather, these embodiments are provided so that this disclosure will be more fully understood and the scope of the disclosure will be fully disclosed.

Embodiments of the present disclosure describe a layer 2 (Layer 2, L2) packet mapping and transmission scheme under an air interface multiple connection for a 5G standard advancement status, a subsequent evolution, and even a multi-connection development trend in a next-generation mobile communication system. Combined with the characteristics of the protocol stack, a new mapping scheme of different types of bearers is given when a new air interface is connected, so that the correct transmission and reception of data packets is realized.

As shown in FIG. 1 , an embodiment of the present disclosure provides a data transmission method, including:

Step 11, the L2 layer of the first device receives at least one data packet;

Step 12: The L2 layer maps the received at least one data packet to multiple transmission channels, and sends the data packet to the second device, where one data packet may be transmitted on at least one of the multiple transmission channels. Different data packets can be transmitted on the same transmission channel or on different transmission channels.

In this embodiment of the present disclosure, the first device may be a network side device or a terminal device; when the first device is a network side device, the second device is a terminal device; when the first device is a terminal device, the second device The device is a network side device; the above embodiment of the present disclosure receives at least one data packet at the L2 layer; and maps the received at least one data packet to multiple transmission channels for transmission; combined with the characteristics of the L2 layer protocol stack, A new mapping scheme for different types of bearers is given when a new air interface is connected, so that the correct transmission and reception of data packets is realized.

In a specific embodiment of the present disclosure, the foregoing step 11 may specifically include: the L2 layer receives at least one service data packet or a signaling data packet from an upper layer.

In this embodiment, when the first device is a network side device, the data packets received by the L2 layer are mainly composed of two types: one is a user plane data packet from the core network, that is, a service data packet, and the related technology is in the LTE. a data packet carried on a data radio bearer (DRB); one type is a signaling packet of a control plane from a radio link control (RRC) sublayer of the L3 layer, and a signaling radio bearer in LTE in the related art ( Packets carried on SRB). When the first device is the terminal device, the at least one service data packet received by the L2 layer from the upper layer is at least one service data packet received from the application layer, and the at least one signaling data packet received from the upper layer is the RRC of the L3 layer of the slave terminal device. Signaling packet received by the sublayer.

That is, the L2 layer receives at least one service data packet or signaling data packet from the upper layer, where: the L2 layer receives at least one service data packet from the core network or the application layer; or the L2 layer receives the RRC sublayer from the radio link control L3 layer of the L3 layer. At least one signaling packet.

In a specific embodiment of the present disclosure, the step of receiving, by the L2 layer, the at least one service data packet or the signaling data packet from the upper layer includes: a Service Data Adaptation Protocol (SDAP) sublayer or a Packet Data Convergence Protocol (PDCP) sub-layer of the L2 layer The layer receives at least one service data packet or signaling data packet from the upper layer.

In this embodiment, the L2 layer includes a Service Data Adaptation Protocol (SDAP) protocol function, a Packet Data Convergence Protocol (PDCP) protocol function, a Radio Link Control (RLC) protocol function, and a Medium Access Control (MAC) protocol function. The distribution or reception of the service data packet or the signaling data packet is implemented in the SDAP sublayer or the PDCP sublayer of the L2 layer; of course, it is not limited to the SDAP sublayer or the PDCP sublayer. In the embodiment of the present disclosure, the L2 layer has a SDAP sublayer and a PDCP sublayer in both the network side device and the terminal device, and may be in the L2 layer when distributing or receiving the service data packet or the signaling data packet. Implemented in the SDAP sublayer or PDCP sublayer.

Further, in the embodiment of the present disclosure, the foregoing step 12 may specifically include:

Step 121: The SDAP sublayer or the PDCP sublayer of the L2 layer maps the received at least one data packet to multiple radio bearers RB according to the transmission order of the data packet, and sends the data to the second device.

The transmission order of at least one of the data packets herein may be an ascending order, a descending order, or a random order of sequence numbers (SNs) of the received data packets.

For example, when the transmission order of at least one data packet is an increasing order of SN, the received data packets are M, and the radio bearer RBs are N, and the sequence numbers of the data packets are SN1, SN2, ..., SNM, RB serial numbers. In this order, RB1, RB2, ..., RBN; then the data packet with sequence number SN1 can be transmitted in any one of RB1, RB2, ..., RBN, and the same data packet with sequence number SN2 can be in RB1, RB2, ... Any one of the RBN transmissions, and so on; but during transmission, the sequence is transmitted according to the sequence number of the data packet. For example, the data packet with the sequence number SN1 is transmitted first, then the data packet with the sequence number SN2 is transmitted, ..., and finally the sequence number is transmitted. A packet for SNM.

Further, step 121 includes:

Step 1211: When the data packet is a service data packet, the received at least one service data packet is mapped to one or more data radio bearers DRB according to a transmission sequence of the specified data packet, and is sent to the second device. Send; or

Step 1212: When the data packet is a signaling data packet, the received at least one signaling data packet is mapped to one or more signaling radio bearers SRB according to a transmission sequence of the specified data packet, and The second device sends.

As shown in FIG. 2, an architectural block diagram of a solution for implementing multi-connection mapping of a first device and a second device is provided, and both the network side device and the terminal device have a data packet transmission according to the upper layer. The sequence requires and the function of sending data in sequence, and the receiver has a sorting function corresponding to the function of sending the transmitter in sequence, and after sorting function processing, the order of sending the data packets by the transmitting end can be restored, here The transmitter and receiver can also be implemented by a transceiver.

The network side device maps the data packets to be sent by the upper layers to one or more transmission channels for transmission: if there is only one transmission channel, it is sent sequentially on the transmission channel; or if there are multiple transmission channels Then, the data is transmitted in parallel on multiple channels, and the data packets are transmitted in increment or decrement manner in the order specified by the upper layer on each transmission channel, or may be transmitted in a random order.

The receivers have the function of receiving data packets from one or both of the transmission channels corresponding to the transmitter and transmitting them correctly to the upper layer.

In a specific embodiment of the present disclosure, as shown in FIG. 3 and FIG. 4, when the transmitter maps at least one data packet to multiple RBs for transmission, it may be implemented in the SDAP sublayer of the L2 layer (as shown in FIG. 3). It can also be implemented in the PDCP sublayer of the L2 layer (as shown in Figure 4);

Specifically, the SDAP sublayer or the PDCP sublayer of the L2 layer maps the received at least one data packet to a plurality of radio bearers RB according to a transmission order of the data packet, and the data packet carries the data. The mapping relationship of the radio bearer RB of the packet is configured by the RRC signaling of the RRC sublayer of the radio link of the L3 layer;

The mapping relationship may be configured by the L3 layer RRC sublayer through RRC signaling. The configuration includes the data packet and the RB (SRB and DRB) mapping relationship. The mapping relationship between the RRC signaling configuration may be a static pair. A mapping relationship, the establishment, change, and contact of the relationship can only be controlled by RRC signaling; or a one-to-many semi-static mapping relationship, that is, RRC sets more than one RB RB set for each data packet, SDAP According to the requirements of each data packet monitored by the system, the appropriate RB transmission is dynamically selected within the RB set to implement the routing function.

In an embodiment of the present disclosure, the first device further has: a function of receiving a data packet sent by the second device.

The above data transmission method further includes:

Step 13: The L2 layer of the first device receives at least one data packet sent by the second device from multiple transmission channels.

Step 14: The at least one data packet is restored and sorted according to the sequence specified by the second device, and the sorted at least one data packet is obtained and sent to the upper layer of the first device.

It should be noted that the order of the step 13 and the step 11 above is not limited, and step 11 may be performed first, and then step 13 may be performed; step 13 may be performed first, then step 11 may be performed; step 11 and step may also be performed. 13 at the same time.

The

above steps

11, 12, 13 and 14 enable bidirectional transmission of data packets on the first device or the second device, and are bidirectional transmission based on a plurality of transmission channels.

In a specific embodiment of the present disclosure, the foregoing step 13 may specifically include:

Step 131: The L2 layer of the first device receives at least one service data packet or signaling data packet sent by the second device from multiple transmission channels.

In a specific implementation, the SDAP sublayer or the PDCP sublayer of the L2 layer of the first device may receive at least one service data packet or signaling data packet sent by the second device from multiple transmission channels.

In the specific embodiment of the present disclosure, when the receiving and collecting are performed according to the type of the data packet, the foregoing step 14 may specifically include:

Step 141: When the data packet is a service data packet, at least one service data packet received from one or more data radio bearers DRB is restored and sorted according to an order specified by the second device, and at least one sorted is obtained. a service packet and sent to the upper layer of the first device; or

Step 142: When the data packet is a signaling data packet, at least one signaling data packet received from one or more signaling radio bearers SRB is restored and sorted according to an order specified by the second device, and is sorted. At least one signaling packet is sent to the upper layer of the first device.

In a specific embodiment of the present disclosure, when the received data packets are aggregated and the data is recovered, the foregoing step 14 may include:

Step 143: Perform restoration and sorting of the at least one data packet according to an order specified by the second device, obtain at least one sorted data packet, and route the sorted at least one data packet to a corresponding service quality flow. QoS Flow and sent to the upper layer of the first device; or

Step 144: The at least one data packet is restored and sorted according to the order of the radio bearers RB and the order specified by the second device, to obtain the sorted at least one data packet, and the sorted data packets are distributed to each corresponding one. The quality of service flows on the QoS Flow and is sent to the upper layer of the first device.

Of course, for the case of the foregoing step 141, the content defined by step 143 or step 144 is also applicable, that is, when the at least one service data packet is sorted, the recovery order is performed according to the QoS flow to which the data packet belongs, and the at least A service data packet is routed to the corresponding quality of service flow QoS Flow and sent to the upper layer of the first device; or the at least one signaling data packet is sorted according to the QoS flow to which the data packet belongs, and the at least A signaling packet is routed to the corresponding Quality of Service Flow QoS Flow and sent to the upper layer of the first device.

Of course, for the case of the foregoing step 142, the content defined in step 143 or step 144 is also applicable, that is, the at least one service data packet is sorted according to the radio bearer RB, that is, the service data packet received from the multiple RBs. Retrieving the order according to the order specified by the second device, and sending the sorted service data packet to the upper layer of the first device; or sorting the at least one signaling data packet, sorting according to the radio bearer RB, that is, from The signaling data packets received on the multiple RBs are restored and sorted according to the order specified by the second device, and the sorted signaling data packets are distributed to each corresponding quality of service flow QoS Flow and sent to the first The upper layer of the device.

In the foregoing embodiment of the present disclosure, as shown in FIG. 2, the network side device or the receiver of the terminal device receives the signaling data packet: after the L2 layer of the network side device receives the signaling data packet from each transmission channel The received signaling data packets are sorted, and the data packets are sequentially delivered to the RRC layer according to the order specified by the first device (such as the serial number of the data packet).

After receiving the user plane data packet (that is, the service data packet) on each transmission channel, the L2 layer of the network side device sorts the received user plane data packets in the order specified by the first device (such as the sequence of data packets). No.) These data packets are sequentially delivered to the core network user plane through the NG interface.

In Figure 3, the receiver function can also be implemented in the SDAP sublayer of the L2 layer. The receiver can receive data packets in multiple transmission channels and restore the order of the transmitting end, and then correctly transmit the data packets to the control plane (via SQoS). Flow) or user plane (via DQoS Flow).

The receiver implements the sequential transmission and delivery of data packets by using a sequence number and a mechanism implementation of the transmit/receive window. When the receiver sorts the received data packets, it may be for each QoS flow, or for each RB, which respectively correspond to different SDAP protocol encapsulated packet data units ( SDAP PDU) format and signaling method.

If the QoS Flow is sorted, after the RB receives the data, the RB can directly route the data packet to the corresponding QoS Flow, and the QoS Flow completes the next sorting function.

If the RB is sorted for each RB, the transmitting end sends each arriving data packet in the order of the FIFO. After the receiving end completes the data packet sorting on each RB, the sorted data is distributed to the corresponding data according to the FIFO order. On each QoS Flow.

The above embodiments of the present disclosure fully utilize the routing function of the SDAP, and realize multiple connections without changing the form of QoS Flow and RB implementation. It does not need to use the split DRB method introduced by the current dual connection, which simplifies the protocol function; the mapping relationship is flexible and controllable, and real-time control can be realized; when multiple air interface connection channel mapping, the signaling flow is simple.

As shown in FIG. 2, an embodiment of the present disclosure further provides a communications device, including:

In the above embodiment of the present disclosure, when the network side device is used as the transmitting end:

Signaling data packet: The RRC layer sends several signaling data packets to the L2 layer, and the L2 layer is in multiple lower layer air interface channels in the order specified by the RRC (ie, multiple RB bearers, that is, the transmission channels described in the foregoing embodiments). The plurality of data packets are sent to the terminal device.

Service data packet: The core network sends several user plane data packets to L2 through the NG interface, and L2 sends the several data packets to the terminal in multiple lower layer air interface channels in the order of First Input First Output (FIFO). device.

When the terminal device acts as the receiving end:

Signaling data packet: After receiving the signaling data packet from each lower layer signaling channel, the L2 layer of the terminal device sorts the received signaling data packets according to the order specified by the transmitting end (such as the serial number of the data packet). ) These packets are delivered to the RRC layer in order.

User plane data packet: After receiving the user plane data packet from each lower layer service channel, the terminal side L2 layer sorts the received user plane data packets according to the order specified by the sending end (such as the serial number of the data packet). These packets are delivered to the upper user plane in sequence.

When the terminal device acts as the sender:

Signaling data packet: The RRC sublayer (the RRC sublayer is located in the L3 layer) sends several signaling data packets to the L2 layer, and the L2 layer sends the several data packets on multiple low layer air interface channels in the order specified by the RRC. Go to the network side device.

User plane data packet: The upper layer of the terminal device sends several user plane data packets to the L2 layer of the terminal device, and the terminal device L2 layer puts the several data packets in multiple lower layer air interface channels according to the FIFO (First Input First Output) sequence. Send to the network side device.

When the network side device acts as the receiving end:

Signaling data packet: After receiving the signaling data packet from each lower layer signaling channel, the L2 layer of the network side device sorts the received signaling data packets according to the sequence specified by the transmitting end (such as the sequence of data packets). No.) These packets are delivered to the RRC layer in order.

User plane data packet: After receiving the user plane data packet from each lower layer service channel, the L2 layer of the network side device sorts the received user plane data packets according to the order specified by the sending end (such as the serial number of the data packet). The data packets are sequentially delivered to the core network user plane through the NG interface.

Regardless of the network side device or the terminal device, when the multi-connection channel routing or mapping is implemented on the L2 layer, it can be implemented in the SDAP protocol function layer of the L2 layer, that is, the SDAP has a sorting and multi-connection channel mapping function scheme; in related technologies, the 5G protocol The SDAP function defined in the user is only the mapping function of the QoS Flow to the DRB of the user plane packet, as shown in Figure 3, including:

A) Support the mapping route function of the control plane data packet to the DRB, that is, the control plane data packet sent by the RRC is mapped to the DRB through the SDAP. To this end, QoS Flow is defined as two types: SQoS flow (Signaling QoS flow) and DQoS Flow (Data QoS Flow). SQoS Flow is used to carry signaling packets (control plane packets), and DQoS flow is used to carry user planes. data pack.

In order to support the route mapping function of the control data packet and the user plane service data packet, the function has a RRC signaling unified configuration start, and the configuration includes the QoS Flow information and the RB (SRB and DRB) mapping relationship carrying the QoS.

The mapping relationship configured by the RRC signaling may be a static one-to-one mapping relationship. The establishment, change, and contact of the relationship may only be controlled by RRC signaling; or may be a one-to-many semi-static mapping relationship, that is, RRC to each The QoS Flow is configured with more than one RB set. The SDAP dynamically selects the appropriate RB to send in the RB set according to the data requirements of each QoS Flow monitored by the system, thereby implementing the routing function.

B) Sequential distribution and aggregation sorting of data packets. The sender transmits packets in one or more lower layer channels in the specified order. The receiving end can receive data packets in multiple lower layer channels and restore the order of the transmitting end, and then correctly send the data to the control plane (via SQoS Flow) or the user plane (via DQoS Flow).

Distribution and aggregation functions: SDAP is required to have flow control function, so that it can send data packets to different lower-layer channels reasonably.

Sorting function: The sequence number (Sequence Number) and the mechanism implementation of the send/receive window are used to implement the sequential transmission and delivery of data packets.

The sorting function may be for each QoS flow or for each RB, which respectively corresponds to different SDAP PDU formats and signaling methods.

The above embodiments of the present disclosure fully utilize the routing function of the SDAP, and realize multiple connections without changing the form of QoS Flow and RB implementation.

The function of the receiver can also be implemented in the PDCP protocol function layer of the L2 layer. The PDCP function defined in the 5G protocol in the related art is in addition to the traditional functions of the PDCP (head compression, decompression; encryption, decryption; group PDU, solution PDU; RB is divided into SRB and DRB; DRB supports dual connectivity of split), and has a sorting function. As shown in Figure 4, the PDCP sublayer includes:

A) Supports the mapping routing function on the RBs (SRB and DRB), that is, the dual-connection existing Split DRB and split SRB modes are not applicable, but the unified RBs (SRB and DRB) can be flexibly mapped to several lower layers at the same time. The channel is connected (this is the logical channel of the RLC).

The route mapping function has the RRC signaling unified configuration start, and the configuration includes the mapping relationship between the RB (SRB and DRB) and the lower layer bearer.

The mapping relationship configured by the RRC signaling may be a static one-to-one mapping relationship. The establishment, change, and contact of the relationship may only be controlled by RRC signaling; or may be a one-to-many semi-static mapping relationship, that is, RRC to each The RBs are configured with more than one logical channel set. The PDCP dynamically selects the appropriate logical channel to be sent within the logical channel set according to the data requirements monitored by the system, thereby implementing the routing function.

B) Sequential distribution and aggregation sorting of data packets. The sender transmits packets in one or more lower layer channels in the specified order. The receiving end can receive data packets in multiple lower layer channels and restore the order of the transmitting end, and then correctly send the data to the control plane (SRB) or the user plane (DRB).

Distribution and aggregation functions: PDCP is required to have flow control function, so that it can send data packets to different lower-layer channels reasonably.

The foregoing embodiment of the present disclosure implements a multi-connection scheme by performing multiple data packet mapping on multiple RBs in the L2 layer, and does not need to use the split DRB method introduced by the dual connection in the related art, which simplifies the protocol function. The mapping relationship is flexible and controllable, and real-time control can be realized; when multiple air interface connection channel mapping, the signaling flow is simple.

It should be noted that the communication device may be a network side device, such as a base station, or a terminal device. All the implementations in the above methods are applicable to the embodiment of the communication device, and the same technical effects can be achieved.

The above is an alternative embodiment of the present disclosure, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present disclosure. Retouching should also be considered as the scope of protection of this disclosure.

Claims

A data transmission method includes:

The L2 layer of the first device receives at least one data packet;

The L2 layer maps the received at least one data packet to a plurality of transmission channels and transmits to the second device.
The data transmission method according to claim 1, wherein the step of the L2 layer receiving the at least one data packet comprises:

The L2 layer receives at least one service data packet or signaling data packet from the upper layer.
The data transmission method according to claim 2, wherein the step of the L2 layer receiving the at least one service data packet or the signaling data packet from the upper layer comprises:

The L2 layer receives at least one service data packet from the core network or the application layer; or

The L2 layer receives at least one signaling data packet from the radio link control RRC sublayer of the L3 layer.
The data transmission method according to claim 2, wherein the step of the L2 layer receiving the at least one service data packet or the signaling data packet from the upper layer comprises:

The L2 layer service data adaptation protocol SDAP sublayer or packet data convergence protocol PDCP sublayer receives at least one service data packet or signaling data packet from the upper layer.
The data transmission method according to claim 4, wherein the step of the L2 layer mapping the received at least one data packet to the plurality of transmission channels and transmitting to the second device comprises:

The SDAP sublayer or the PDCP sublayer of the L2 layer maps the received at least one data packet to the plurality of radio bearers RB according to the transmission order of the data packet, and sends the data to the second device.
The data transmission method according to claim 5, wherein the SDAP sublayer or the PDCP sublayer of the L2 layer maps the received at least one data packet to a plurality of radio bearers RB according to a transmission order of the data packets. And the steps sent to the second device include:

When the data packet is a service data packet, the received at least one service data packet is mapped to one or more data radio bearers DRB according to a transmission sequence of the specified data packet, and sent to the second device; or

When the data packet is a signaling data packet, the received at least one signaling data packet is mapped to one or more signaling radio bearers SRB according to a transmission sequence of the specified data packet, and is sent to the second device. send.
The data transmission method according to claim 6, wherein the transmission order of the data packets includes an ascending order, a descending order, or a random order of sequence numbers of the received data packets.
The data transmission method according to claim 5, wherein the SDAP sublayer or the PDCP sublayer of the L2 layer maps the received at least one data packet to a plurality of radio bearers RB according to a transmission order of the data packets. The mapping relationship between the data packet and the radio bearer RB carrying the data packet is configured by the RRC signaling of the RRC sublayer controlled by the radio link of the L3 layer;

The mapping relationship includes: one data packet is mapped to a configured RB for transmission, or one data packet is mapped to a target RB for transmission, and the target RB is one of the plurality of RBs.
The data transmission method according to claim 1, further comprising:

Receiving, by the L2 layer of the first device, the at least one data packet sent by the second device from the multiple transmission channels;

And sorting the at least one data packet according to an order specified by the second device, and obtaining the sorted at least one data packet, and sending the data packet to the upper layer of the first device.
The data transmission method according to claim 9, wherein the step of receiving, by the L2 layer of the first device, the at least one data packet sent by the second device from the plurality of transmission channels comprises:

The L2 layer of the first device receives at least one service data packet or signaling data packet sent by the second device from the multiple transmission channels.
The data transmission method according to claim 10, wherein the step of receiving, by the L2 layer of the first device, the at least one service data packet or the signaling data packet sent by the second device from the plurality of transmission channels comprises:

The service data adaptation protocol SDAP sublayer or the packet data convergence protocol PDCP sublayer of the L2 layer of the first device receives at least one service data packet or signaling data packet sent by the second device from the plurality of transmission channels.
The data transmission method according to claim 11, wherein the at least one data packet is restored and sorted according to an order specified by the second device, and the sorted at least one data packet is obtained and sent to an upper layer of the first device. The steps include:

When the data packet is a service data packet, at least one service data packet received from one or more data radio bearers DRB is restored and sorted according to an order specified by the second device, and the sorted at least one service data packet is obtained. And sent to the upper layer of the first device; or

When the data packet is a signaling data packet, at least one signaling data packet received from one or more signaling radio bearers SRB is restored and sorted according to an order specified by the second device, and at least one sorted is obtained. Signaling the data packet and sending it to the upper layer of the first device.
The data transmission method according to claim 9, wherein the at least one data packet is restored and sorted according to an order specified by the second device, and the sorted at least one data packet is obtained and sent to an upper layer of the first device. The steps include:

Retrieving the at least one data packet in an order specified by the second device, obtaining the sorted at least one data packet, and routing the sorted at least one data packet to a corresponding quality of service flow QoS Flow, And sent to the upper layer of the first device; or

And sorting the at least one data packet according to the order of the radio bearer RBs and the order specified by the second device, obtaining the sorted at least one data packet, and routing the sorted data packets to the corresponding QoS flow Up and send to the upper layer of the first device.
A communication device comprising:

And a transceiver, configured to receive at least one data packet at the L2 layer; and map the received at least one data packet to multiple transmission channels, and send the data to the second device.
The communication device according to claim 14, wherein said transceiver is specifically configured to receive at least one service data packet or signaling data packet from an upper layer at an L2 layer.
The communication device according to claim 15, wherein said transceiver is specifically configured to receive at least one service data packet from a core network at an L2 layer; or receive at least one signaling data from a radio link control RRC sublayer of an L3 layer. package.
The communication device according to claim 15, wherein said transceiver is located at a service data adaptation protocol SDAP sublayer or a packet data convergence protocol PDCP sublayer of said L2 layer.
The communication device according to claim 17, wherein said transceiver maps said received at least one data packet to a plurality of radio bearers RB in accordance with a transmission order of the data packets, and transmits to said second device.
The communication device according to claim 18, wherein, when said data packet is a service data packet, said transceiver maps said received at least one service data packet to an OR in accordance with a transmission order of the specified data packet Multiple data is wirelessly carried on the DRB and sent to the second device; or

When the data packet is a signaling data packet, the transceiver maps the received at least one signaling data packet to one or more signaling radio bearers SRB according to a transmission sequence of the specified data packet, and Send to the second device.
The communication device according to claim 19, wherein the transmission order of the data packets comprises an ascending order, a descending order, or a random order of sequence numbers of the received data packets.
The communication device according to claim 18, wherein said transceiver transmits the received data packet to said plurality of radio bearers RB in accordance with a transmission order of the data packets, and the data packet carries the data packet The mapping relationship of the radio bearers RB is configured by the RRC signaling of the RRC sublayer controlled by the radio link of the L3 layer;

The mapping relationship includes: one data packet is mapped to a configured RB for transmission, or one data packet is mapped to a target RB for transmission, and the target RB is one of the plurality of RBs.
The communication device according to claim 14, wherein the transceiver is further configured to receive, on the L2 layer, at least one data packet sent by the second device from the plurality of transmission channels; in the order specified by the second device, The at least one data packet is restored and sorted, and the sorted at least one data packet is obtained and sent to an upper layer of the first device.
The communication device of claim 22, wherein the transceiver is specifically configured to receive at least one service data packet or signaling data packet transmitted by the second device from the plurality of transmission channels.
The communication device of claim 22, wherein the transceiver is located in a Service Data Adaptation Protocol SDAP sublayer or a Packet Data Convergence Protocol PDCP sublayer of the L2 layer of the communication device.
The communication device according to claim 22, wherein

When the data packet is a service data packet, the transceiver recovers at least one service data packet received from one or more data radio bearers DRB according to an order specified by the second device, and obtains at least one sorted order. a service packet sent to the upper layer of the first device; or

When the data packet is a signaling data packet, the transceiver recovers and sorts at least one signaling data packet received from one or more signaling radio bearers SRB according to an order specified by the second device. The latter at least one signaling packet is sent to the upper layer of the first device.
The communication device according to claim 22, wherein the transceiver is specifically configured to: restore the at least one data packet according to an order specified by the second device, obtain the sorted at least one data packet, and sort the data packet. The at least one subsequent data packet is routed to the corresponding quality of service flow QoS Flow and sent to the upper layer of the first device; or

And sorting the at least one data packet according to the order of the radio bearer RBs and the order specified by the second device, obtaining the sorted at least one data packet, and distributing the sorted data packets to each corresponding service quality stream. QoS Flow is sent to the upper layer of the first device.
A communication device comprising: a processor, a memory storing a computer program, the computer program being executed by the processor, the method of any one of claims 1-13.
A computer readable storage medium comprising instructions which, when executed by a computer, cause a computer to perform the method of any of claims 1-13.