CN110012506B - Data transmission method and communication equipment - Google Patents

Data transmission method and communication equipment Download PDF

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Publication number
CN110012506B
CN110012506B CN201810009456.2A CN201810009456A CN110012506B CN 110012506 B CN110012506 B CN 110012506B CN 201810009456 A CN201810009456 A CN 201810009456A CN 110012506 B CN110012506 B CN 110012506B
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data packet
layer
data
packet
signaling
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CN110012506A (en
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孙军帅
王莹莹
黄学艳
韩星宇
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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Priority to CN201810009456.2A priority Critical patent/CN110012506B/en
Priority to PCT/CN2018/121473 priority patent/WO2019134496A1/en
Publication of CN110012506A publication Critical patent/CN110012506A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/082—Load balancing or load distribution among bearers or channels

Abstract

The embodiment of the invention provides a data transmission method and communication equipment, relating to the field of communication; the data transmission method comprises the following steps: the L2 layer of the first device receives at least one data packet; the layer L2 maps the received at least one data packet to a plurality of transmission channels and transmits the data packet to the second device. And may further include: the L2 layer of the first device receives at least one data packet sent by the second device from a plurality of transmission channels; and sequencing the at least one data packet, and sending the sequenced at least one data packet to an upper layer of the first equipment according to the sequence specified by the second equipment. The scheme of the invention realizes the multi-connection channel transmission of the data packet on the L2 layer and further realizes the correct receiving and sending of the multi-connection data packet.

Description

Data transmission method and communication equipment
Technical Field
The present invention relates to the field of communications, and in particular, to a data transmission method and a communication device.
Background
Double connection is introduced into the 4G, and double link transceiving of a service Data Packet and a signaling Data Packet is realized through a split DRB (split Data bearer) and a split SRB (signaling bearer) of a Packet Data Convergence Protocol (PDCP).
In 5G, an SDAP (Service Data attachment Protocol) Protocol layer is introduced, and a main function of the SDAP Protocol layer is to implement a Service Data adaptation layer Protocol function.
In 5G, the dual connectivity is not only preserved but the functionality is enhanced. In the subsequent evolution of 5G, even in the next generation mobile communication system in the future, the multi-connection mode more than the dual-connection mode is inevitably widely used.
However, there is no solution for the multi-connection channel of 5G in which the data packet is mapped to the air interface.
Disclosure of Invention
The invention provides a data transmission method and communication equipment, which realize multi-connection channel transmission data packets on an L2 layer and further realize correct receiving and sending of the multi-connection data packets.
To solve the above technical problem, an embodiment of the present invention provides the following solutions:
a method of data transmission, comprising:
the L2 layer of the first device receives at least one data packet;
the layer L2 maps the received at least one data packet to a plurality of transmission channels and transmits the data packet to the second device.
Wherein the step of the L2 layer receiving at least one data packet comprises:
the L2 layer receives at least one service packet or signaling packet from an upper layer.
Wherein, the step that the L2 layer receives at least one service data packet or 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 packet from the radio link control RRC sublayer of the L3 layer.
Wherein, the step that the L2 layer receives at least one service data packet or signaling data packet from the upper layer comprises:
the service data adaptation protocol, SDAP, sublayer or the packet data convergence protocol, PDCP, sublayer of the L2 layer receives at least one service packet or signaling packet from an upper layer.
The step of mapping, by the layer L2, the received at least one data packet onto a plurality of transmission channels, and sending the at least one data packet to the second device includes:
and 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 (RBs) according to the transmission order of the data packet, and sends the data packet to the second device.
Wherein, the step of mapping the received at least one data packet to a plurality of radio bearers RB according to the transmission order of the data packet by the SDAP sublayer or the PDCP sublayer of the L2 layer, and sending the data packet to the second device includes:
when the data packet is a service data packet, mapping the received at least one service data packet to one or more Data Radio Bearers (DRBs) according to the transmission order of the specified data packet, and sending the DRBs to a second device; or
And when the data packet is a signaling data packet, mapping the received at least one signaling data packet to one or more Signaling Radio Bearers (SRBs) according to the transmission sequence of the specified data packet, and sending the SRBs to the second equipment.
Wherein the transmission order of the data packets comprises: the sequence number of the received packet may be in an ascending order, a descending order, or a random order.
When 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 the transmission order of the data packet, the mapping relationship between the data packet and the radio bearer RB carrying the data packet is configured by the RRC signaling of the radio link control RRC sublayer of the L3 layer;
the mapping relationship comprises: one packet is mapped to a configured RB for transmission, or one packet is mapped to a target RB for transmission, the target RB being a selected one of a plurality of RBs.
The data transmission method further comprises the following steps:
the L2 layer of the first device receives at least one data packet sent by the second device from a plurality of transmission channels;
and according to the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, and sending the at least one sequenced data packet to the upper layer of the first equipment.
The step of receiving, by the L2 layer of the first device, at least one data packet sent by the second device from a plurality of 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 a plurality of transmission channels.
The step of receiving, by the L2 layer of the first device, at least one service data packet or signaling data packet sent by the second device from a plurality of 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 a plurality of transmission channels.
The step of performing recovery sorting on the at least one data packet according to the sequence specified by the second device to obtain at least one sorted data packet, and sending the at least one sorted data packet to the upper layer of the first device includes:
when the data packets are service data packets, performing recovery sequencing on at least one service data packet received from one or more Data Radio Bearers (DRBs) according to a sequence specified by the second device to obtain at least one sequenced service data packet, and sending the at least one sequenced service data packet to an upper layer of the first device; or
And when the data packets are signaling data packets, restoring and sequencing at least one signaling data packet received from one or more Signaling Radio Bearers (SRBs) according to the sequence specified by the second equipment to obtain at least one sequenced signaling data packet, and sending the at least one sequenced signaling data packet to the upper layer of the first equipment.
The step of performing recovery sorting on the at least one data packet according to the sequence specified by the second device to obtain at least one sorted data packet, and sending the at least one sorted data packet to the upper layer of the first device includes:
according to the sequence appointed by the second equipment, the at least one data packet is subjected to recovery sequencing to obtain at least one sequenced data packet, and the at least one sequenced data packet is routed to the corresponding QoS Flow and is sent to the upper layer of the first equipment; or
And according to the sequence of the Radio Bearer (RB) and the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, distributing the sequenced data packet to each corresponding quality of service (QoS) Flow, and sending the sequenced data packet to an upper layer of the first equipment.
An embodiment of the present invention further provides a communication device, including:
a transceiver for receiving at least one data packet at layer L2; and mapping the received at least one data packet to a plurality of transmission channels and sending the data packet to the second device.
Wherein the transceiver is specifically configured to receive at least one service data packet or signaling data packet from an upper layer at layer L2.
Wherein the transceiver is specifically configured to receive at least one service data packet from a core network at layer L2; or at least one signaling packet from the radio link control RRC sublayer of the L3 layer.
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.
And the transceiver maps the received at least one data packet to a plurality of Radio Bearers (RBs) according to the transmission order of the data packet, and transmits the data packet to the second device.
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 (DRBs) according to a transmission order of the designated data packet, and sends the DRBs to a second device; or
And 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 (SRBs) according to the transmission sequence of the specified data packet, and sends the SRBs to the second device.
Wherein the transmission order of the data packets comprises: the sequence number of the received packet may be in an ascending order, a descending order, or a random order.
When the transceiver maps the received at least one data packet to a plurality of Radio Bearers (RBs) according to the transmission order of the data packet, the mapping relationship between the data packet and the Radio Bearers (RBs) carrying the data packet is configured by RRC signaling of a radio link control (RRC) sublayer of an L3 layer;
the mapping relationship comprises: one packet is mapped to a configured RB for transmission, or one packet is mapped to a target RB for transmission, the target RB being a selected one of a plurality of RBs.
Wherein the transceiver is further configured to receive at least one data packet transmitted by the second device from a plurality of transmission channels at layer L2; and according to the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, and sending the at least one sequenced data packet to the upper layer of the first equipment.
The transceiver is used for receiving at least one service data packet or signaling data packet sent by the second device from a plurality of transmission channels.
Wherein the transceiver is located in a service data adaptation protocol, SDAP, sublayer or a packet data convergence protocol, PDCP, sublayer of an L2 layer of the communication device.
When the data packets are service data packets, the transceiver performs recovery sorting on at least one service data packet received from one or more Data Radio Bearers (DRBs) according to a sequence specified by the second device to obtain at least one sorted service data packet, and sends the at least one sorted service data packet to an upper layer of the first device; or
And when the data packets are signaling data packets, the transceiver restores and sequences at least one signaling data packet received from one or more Signaling Radio Bearers (SRBs) according to the sequence specified by the second device to obtain at least one sequenced signaling data packet, and sends the at least one sequenced signaling data packet to the upper layer of the first device.
The transceiver is specifically configured to perform recovery sorting on the at least one data packet according to an order specified by the second device to obtain at least one sorted data packet, route the at least one sorted data packet to a corresponding QoS Flow, and send the at least one sorted data packet to an upper layer of the first device; or
And according to the sequence of the Radio Bearer (RB) and the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, distributing the sequenced data packet to each corresponding quality of service (QoS) Flow, and sending the sequenced data packet to an upper layer of the first equipment.
An embodiment of the present invention further provides a communication device, including: a processor, a memory storing a computer program which, when executed by the processor, performs the method as described above.
Embodiments of the present invention also provide a computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the method as described above.
The scheme of the invention at least comprises the following beneficial effects:
the above scheme of the present invention, by receiving at least one data packet at layer L2 and mapping the received at least one data packet to a plurality of transmission channels for transmission; the multi-connection channel is realized on the layer L2 to transmit the data packet, and further, the correct transceiving of the data packet of the multi-connection is realized.
Drawings
FIG. 1 is a flow chart of a data transmission method according to an embodiment of the present invention;
FIG. 2 is an architectural diagram of an implementation of a multi-connection mapping of a first device and a second device;
fig. 3 is a schematic diagram of the architecture of the SDAP sublayer implemented at the L2 layer in the data transmission method of the present invention;
fig. 4 is a schematic diagram of an architecture of the PDCP sublayer at the L2 layer for implementing the data transmission method of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention aims at the current situation, the subsequent evolution of the 5G standard, and even the development trend of multi-connection in the next generation mobile communication system, and describes the scheme of mapping and transmitting the L2(Layer 2: Layer 2) data packet under air interface multi-connection. The characteristics of a protocol stack are combined, a brand-new mapping scheme with different types of bearing unification when the air interface has multiple connecting channels is provided, and therefore correct receiving and sending of data packets are achieved.
As shown in fig. 1, an embodiment of the present invention provides a data transmission method, including:
step 11, the L2 layer of the first device receives at least one data packet;
in 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, and different data packets may be transmitted on the same transmission channel or different transmission channels.
In this embodiment of the present invention, the first device may be a network side device or a terminal device; when the first equipment is network side equipment, the second equipment is terminal equipment; when the first equipment is terminal equipment, the second equipment is network side equipment; the above embodiments of the present invention are implemented by receiving at least one data packet at the L2 layer; mapping the received at least one data packet to a plurality of transmission channels for transmission; the characteristics of an L2 layer protocol stack are combined, a brand-new mapping scheme for different types of bearing unification when the air interface is provided with multiple connecting channels is provided, and therefore correct receiving and sending of data packets are achieved.
In an embodiment of the present invention, the step 11 may specifically include: the L2 layer receives at least one service packet or signaling packet from an upper layer.
In this embodiment, when the first device is a network side device, the data packet received by the L2 layer mainly includes two types: one is a user plane packet from the core network, i.e. a service packet, which is currently carried on a DRB (data radio bearer) in LTE; one type is the signalling packets for the control plane from the RRC (radio link control) sublayer of the L3 layer, currently the packets carried on SRBs (signalling radio bearers) in LTE. When the first device is a terminal device, the at least one service data packet received by the L2 layer from the upper layer is the at least one service data packet received by the application layer, and the at least one signaling data packet received by the L3 layer from the upper layer is a signaling data packet received by the RRC sublayer of the L3 layer of the terminal device.
That is, the step of the L2 layer receiving at least one service data packet or 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 packet from the radio link control RRC sublayer of the L3 layer.
In an embodiment of the present invention, the step of the L2 layer receiving at least one service data packet or signaling data packet from the upper layer includes: the SDAP (service data adaptation protocol) sublayer or the PDCP (packet data convergence protocol) sublayer of the L2 layer receives at least one service packet or signaling packet from an upper layer.
In this embodiment, the L2 layer includes an SDAP (service data adaptation protocol) protocol function, a PDCP (packet data convergence protocol) protocol function, an RLC (radio link control) protocol function, and a MAC (medium access control) protocol function. The distribution or the reception of service data packets or signaling data packets is realized in an SDAP sublayer or a PDCP sublayer of an L2 layer; of course, is not limited to the SDAP sublayer or the PDCP sublayer. In the embodiment of the present invention, no matter the network side device or the terminal device, the L2 layer has the SDAP sublayer and the PDCP sublayer, and when distributing or receiving and converging the service data packet or the signaling data packet, the SDAP sublayer or the PDCP sublayer in the L2 layer can be implemented.
Further, in an embodiment of the present invention, the step 12 may specifically include:
in step 121, 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 the transmission order of the data packet, and sends the data packet to the second device.
The transmission order of the at least one data packet here may be: the Sequence Number (SN) of the received data packet is in an increasing order, a decreasing order, or a random order.
For example, when the transmission order of at least one data packet is the ascending order of SN, the number of received data packets is M, the number of radio bearers RB is N, the sequence numbers of the data packets are SN1, SN2, … …, SNM, and the sequence numbers of RB are RB1, RB2, … …, and RBN in sequence; then the data packet with SN1 sequence number may be transmitted in any of RB1, RB2, … …, RBN, the same data packet with SN2 sequence number may be transmitted in any of RB1, RB2, … …, RBN, and so on; however, during transmission, the data packets are transmitted in sequence according to their sequence numbers, 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 data packet with the sequence number SNM is transmitted.
Further, step 121 includes:
step 1211, when the data packet is a service data packet, mapping the received at least one service data packet to one or more data radio bearers DRBs according to a transmission order of the designated data packet, and sending the data packet to a second device; or
Step 1212, when the data packet is a signaling data packet, mapping the received at least one signaling data packet to one or more signaling radio bearers SRBs according to the specified transmission order of the data packet, and sending the signaling data packet to the second device.
As shown in fig. 2, an architecture block diagram of a scheme for implementing multi-connection mapping of a first device and a second device is provided, where both the network-side device and the terminal device have a function of sequentially (in sequence) sending data according to a data packet sending sequence requirement specified by an Upper layer (Upper layers), and a receiver has a sorting function corresponding to the transmitter sequential sending function, and can recover the sequence of sending data packets by a sending end through processing by the sorting function, where the transmitter and the receiver can also be implemented by one transceiver.
The network side equipment maps the data packets to be sent by the Upper layers (Upper layers) to one or more than one transmission channels for sending: if only one transmission channel exists, sending the data on the transmission channel in sequence; or if a plurality of transmission channels exist, the data packets are transmitted in parallel on the plurality of channels, and the data packets are transmitted on each transmission channel in an ascending or descending manner according to the sequence specified by the upper layer, or the data packets are transmitted completely in a random sequence.
The receiver has the function of receiving data packets from one or a plurality of transmission channels simultaneously corresponding to the transmitter and sending the data packets to the upper layer correctly.
In an embodiment of the present invention, as shown in fig. 3 and fig. 4, when the transmitter maps at least one data packet onto multiple RBs for transmission, the mapping may be implemented in the SDAP sublayer of the L2 layer (as shown in fig. 3), or may be implemented in the PDCP sublayer of the L2 layer (as shown in fig. 4);
specifically, when 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 the transmission order of the data packet for transmission, the mapping relationship between the data packet and the radio bearer RB carrying the data packet is configured by the RRC signaling of the radio link control RRC sublayer of the L3 layer;
the mapping relationship comprises: one packet is mapped to a configured RB for transmission, or one packet is mapped to a target RB for transmission, the target RB being a selected one of a plurality of RBs.
The mapping relationship can be uniformly configured by the L3 layer RRC sublayer through RRC signaling, and in the configuration, the mapping relationship includes a data packet and an RB (SRB and DRB) mapping relationship for carrying the data packet, and the mapping relationship configured by the RRC signaling can be a static one-to-one mapping relationship, and the establishment, change and contact of the relationship can only be controlled through RRC signaling; or a one-to-many semi-static mapping relationship, that is, the RRC configures an RB set of more than one RB for each packet, and the SDAP dynamically selects an appropriate RB to transmit in the RB set according to the requirement of each packet monitored by the system, thereby implementing a routing function.
In an embodiment of the present invention, the first device further has: and receiving the data packet sent by the second device.
The data transmission method further includes:
step 13, the layer L2 of the first device receives at least one data packet sent by the second device from a plurality of transmission channels;
and 14, performing recovery sequencing on the at least one data packet according to the sequence specified by the second equipment to obtain at least one sequenced data packet, and sending the at least one sequenced data packet to the upper layer of the first equipment.
It should be noted that: the sequence of step 13 and step 11 is not limited in sequence, and step 11 may be performed first, and then step 13 may be performed; or step 13 may be performed first, and then step 11 may be performed; step 11 and step 13 may be performed simultaneously.
The above steps 11, 12, 13 and 14 enable bidirectional transmission of data packets on the first device or the second device, and are based on a plurality of transmission channels.
In an embodiment of the present invention, the step 13 may specifically include:
at 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 receives at least one service packet or signaling packet sent by the second device from multiple transmission channels.
In a specific embodiment of the present invention, when performing receiving aggregation according to the type of the data packet, step 14 may specifically include:
step 141, when the data packet is a service data packet, performing recovery sorting on at least one service data packet received from one or more data radio bearers DRBs according to an order specified by the second device to obtain at least one sorted service data packet, and sending the at least one sorted service data packet to an upper layer of the first device; or
And 142, when the data packets are signaling data packets, performing recovery sequencing on at least one signaling data packet received from one or more signaling radio bearers SRBs according to the sequence specified by the second device to obtain at least one sequenced signaling data packet, and sending the at least one sequenced signaling data packet to the upper layer of the first device.
In a specific embodiment of the present invention, when performing aggregation sequencing on the received data packets and recovering the data, step 14 may include:
step 143, according to the sequence specified by the second device, performing recovery sorting on the at least one data packet to obtain at least one sorted data packet, and routing the at least one sorted data packet to a corresponding QoS Flow and sending the at least one sorted data packet to an upper layer of the first device; or
And step 144, performing recovery sorting on the at least one data packet according to the sequence of the radio bearer RB and the sequence specified by the second device to obtain at least one sorted data packet, distributing the sorted data packet to each corresponding QoS Flow, and sending the sorted data packet to an upper layer of the first device.
Of course, in the case of the above step 141, the same applies to the content defined in step 143 or step 144, that is, when the at least one service data packet is sequenced, the at least one service data packet is reordered according to the QoS Flow to which the data packet belongs, and the at least one service data packet is routed to the corresponding QoS Flow, and sent to the upper layer of the first device; or sequencing the at least one signaling data packet according to the QoS Flow to which the data packets belong, routing the at least one signaling data packet to the corresponding QoS Flow, and sending the at least one signaling data packet to an upper layer of the first device.
Of course, in the case of the above step 142, the same applies as the content defined in step 143 or step 144, that is, the at least one service data packet is sequenced according to the radio bearers RB, that is, the service data packets received from the plurality of RBs are subjected to the recovery sequencing according to the sequence specified by the second device, and the sequenced service data packets are sent to the upper layer of the first device; or when the at least one signaling data packet is sequenced, sequencing is performed according to the radio bearer RB, that is, the signaling data packets received from the plurality of RBs are subjected to recovery sequencing according to the sequence specified by the second device, and the sequenced signaling data packets are distributed to each corresponding QoS Flow and sent to the upper layer of the first device.
In the above embodiment of the present invention, as shown in fig. 2, when the receiver of the network side device or the terminal device receives the signaling data packet: after receiving the signaling packets from each transmission channel, the L2 layer of the network side device sorts the received signaling packets, and sequentially delivers the signaling packets to the RRC layer according to the sequence (for example, the sequence number of the data packet) specified by the first device.
After receiving the user plane data packets (i.e., service data packets) from each transmission channel, the L2 layer of the network side device sorts the received user plane data packets, and sequentially delivers the data packets to the core network user plane for processing through the NG interface according to the order (e.g., sequence number of the data packet) specified by the first device.
In fig. 3, the function of the receiver can also be implemented in the SDAP sublayer of the L2 layer, and 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 (through SQoS Flow) or the user plane (through DQoS Flow).
The receiver adopts a mechanism realization mode of Sequence Number (Sequence Number) and sending/receiving window to realize the sequential sending and delivery of the data packet. The receiver may order the received packets for each QoS flow (quality of service flow) or for each RB, which correspond to different SDAP PDU (packet data unit encapsulated by the SDAP protocol) formats and signaling schemes.
If the ordering is carried out aiming at each QoS Flow, the RB directly routes the data packet to the corresponding QoS Flow after receiving the data, and the QoS Flow completes the next ordering function.
And if the data packets are sequenced aiming at each RB, the transmitting end transmits each arrived data packet according to the FIFO sequence, and the receiving end distributes the sequenced data to each corresponding QoS Flow according to the FIFO sequence after finishing the sequencing of the data packets on each RB.
The above embodiments of the present invention fully utilize the routing function of the SDAP, and realize multiple connections without changing the QoS Flow and RB implementation forms. The split DRB method introduced by the existing dual connection is not needed, and the protocol function is simplified; the mapping relation is flexible and controllable, and real-time control can be achieved; when a plurality of air interface connection channels are mapped, the signaling flow is simple.
As shown in fig. 2, an embodiment of the present invention further provides a communication device, including:
a transceiver for receiving at least one data packet at layer L2; and mapping the received at least one data packet to a plurality of transmission channels and sending the data packet to the second device.
Wherein the transceiver is specifically configured to receive at least one service data packet or signaling data packet from an upper layer at layer L2.
Wherein the transceiver is specifically configured to receive at least one service data packet from a core network at layer L2; or at least one signaling packet from the radio link control RRC sublayer of the L3 layer.
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.
And the transceiver maps the received at least one data packet to a plurality of Radio Bearers (RBs) according to the transmission order of the data packet, and transmits the data packet to the second device.
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 (DRBs) according to a transmission order of the designated data packet, and sends the DRBs to a second device; or
And 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 (SRBs) according to the transmission sequence of the specified data packet, and sends the SRBs to the second device.
Wherein the transmission order of the data packets comprises: the sequence number of the received packet may be in an ascending order, a descending order, or a random order.
When the transceiver maps the received at least one data packet to a plurality of Radio Bearers (RBs) according to the transmission order of the data packet, the mapping relationship between the data packet and the Radio Bearers (RBs) carrying the data packet is configured by RRC signaling of a radio link control (RRC) sublayer of an L3 layer;
the mapping relationship comprises: one packet is mapped to a configured RB for transmission, or one packet is mapped to a target RB for transmission, the target RB being a selected one of a plurality of RBs.
Wherein the transceiver is further configured to receive at least one data packet transmitted by the second device from a plurality of transmission channels at layer L2; and according to the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, and sending the at least one sequenced data packet to the upper layer of the first equipment.
The transceiver is used for receiving at least one service data packet or signaling data packet sent by the second device from a plurality of transmission channels.
Wherein the transceiver is located in a service data adaptation protocol, SDAP, sublayer or a packet data convergence protocol, PDCP, sublayer of an L2 layer of the communication device.
When the data packets are service data packets, the transceiver performs recovery sorting on at least one service data packet received from one or more Data Radio Bearers (DRBs) according to a sequence specified by the second device to obtain at least one sorted service data packet, and sends the at least one sorted service data packet to an upper layer of the first device; or
And when the data packets are signaling data packets, the transceiver restores and sequences at least one signaling data packet received from one or more Signaling Radio Bearers (SRBs) according to the sequence specified by the second device to obtain at least one sequenced signaling data packet, and sends the at least one sequenced signaling data packet to the upper layer of the first device.
The transceiver is specifically configured to perform recovery sorting on the at least one data packet according to an order specified by the second device to obtain at least one sorted data packet, route the at least one sorted data packet to a corresponding QoS Flow, and send the at least one sorted data packet to an upper layer of the first device; or
And according to the sequence of the Radio Bearer (RB) and the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, distributing the sequenced data packet to each corresponding quality of service (QoS) Flow, and sending the sequenced data packet to an upper layer of the first equipment.
In the above embodiment of the present invention, when the network side device serves as the sending end:
signaling data packet: the RRC layer sends a plurality of signaling packets to the L2 layer, and the L2 layer sends the plurality of signaling packets to the terminal device on a plurality of lower layer air interface channels (i.e., a plurality of RB bearers, i.e., the transmission channels described in the above embodiments) according to the sequence specified by the RRC.
Service data packet: the core network sends a plurality of user plane data packets to L2 through NG interface, L2 sends the data packets to the terminal equipment in a plurality of low-layer air interface channels according to the sequence of FIFO (First Input First output).
When the terminal equipment is used as a receiving end:
signaling data packet: after receiving the signaling data packets from each lower layer signaling channel, the L2 layer of the terminal device orders the received signaling data packets, and sequentially delivers the data packets to the RRC layer according to the sequence (such as the sequence number of the data packet) specified by the sender.
User plane data packet: after receiving the user plane packets from each lower layer service channel, the terminal side L2 layer sorts the received user plane packets, and sequentially delivers the packets to the upper layer user plane for processing according to the sequence (such as the sequence number of the packet) specified by the sender.
When the terminal equipment is used as a sending end:
signaling data packet: the RRC sublayer (the RRC sublayer is located in the L3 layer) sends a plurality of signaling packets to the L2 layer, and the L2 layer sends the plurality of signaling packets to the network side device on a plurality of lower layer air interface channels according to the sequence specified by the RRC.
User plane data packet: the upper layer of the terminal equipment sends a plurality of user plane data packets to the L2 layer of the terminal equipment, and the L2 layer of the terminal equipment sends the data packets to the network side equipment on a plurality of low-layer air interface channels according to the sequence of FIFO (First Input First output).
When the network side equipment is used as a receiving end:
signaling data packet: after receiving the signaling data packets from each lower layer signaling channel, the L2 layer of the network side device sequences the received signaling data packets, and sequentially delivers the data packets to the RRC layer according to the sequence (for example, the sequence number of the data packet) specified by the sender.
User plane data packet: after receiving the user plane data packets from each lower layer service channel, the L2 layer of the network side device sorts the received user plane data packets, and sequentially delivers the data packets to the core network user plane for processing through the NG interface according to the order (such as the sequence number of the data packet) specified by the sending end.
No matter the network side equipment or the terminal equipment, when the multi-connection channel routing or mapping is realized on the L2 layer, the multi-connection channel routing or mapping can be realized on the SDAP protocol functional layer of the L2 layer, namely the SDAP has a sequencing and multi-connection channel mapping functional scheme; the current SDAP function defined in the 5G protocol is only a mapping function of QoS Flow (quality of service Flow) of user plane packets to DRB, as shown in fig. 3, and includes:
A) and a mapping routing function of the control plane data packet to the DRB is supported, namely the control plane data packet sent by the RRC is mapped to the DRB through the SDAP. For this purpose, QoS Flow is defined as two types, SQoS Flow (Signaling QoS Flow) for carrying Signaling packets (control plane packets) and DQoS Flow (Data QoS Flow) for carrying user plane packets.
In order to support the routing mapping function for the control data packet and the user plane service data packet, the function is started by unified configuration of RRC signaling, and the configuration comprises QoS Flow information and RB (SRB and DRB) mapping relation for bearing the QoS Flow information.
The mapping relation configured by the RRC signaling can be a static one-to-one mapping relation, and the establishment, the change and the contact of the relation can be controlled only by the RRC signaling; or a one-to-many semi-static mapping relationship, that is, the RRC configures more than one RB set for each QoS Flow, and the SDAP dynamically selects an appropriate RB to send in the RB set according to the data requirement of each QoS Flow monitored by the system, thereby implementing a routing function.
B) In-order distribution and aggregation ordering functions for data packets. The sender sends the data packets in the specified order in one or more lower layer lanes. The receiving end can receive data packets in a plurality of lower-layer channels and restore the sequence of the transmitting end, and then correctly transmit the data to a control plane (through SQoS Flow) or a user plane (through DQoS Flow).
Distribution and aggregation function: it is desirable for the SDAP to have flow control capability so that it can send packets reasonably to different lower layer channels.
A sorting function: the sequential sending and delivery of the data packets are realized by adopting a mechanism realization mode of Sequence Number (Sequence Number) and a sending/receiving window.
The ordering function may be for each QoS flow or for each RB, which correspond to different SDAP PDU formats and signaling schemes, respectively.
If the ordering is carried out aiming at each QoS Flow, the RB directly routes the data packet to the corresponding QoS Flow after receiving the data, and the QoS Flow completes the next ordering function.
And if the data packets are sequenced aiming at each RB, the transmitting end transmits each arrived data packet according to the FIFO sequence, and the receiving end distributes the sequenced data to each corresponding QoS Flow according to the FIFO sequence after finishing the sequencing of the data packets on each RB.
The above embodiments of the present invention fully utilize the routing function of the SDAP, and realize multiple connections without changing the QoS Flow and RB implementation forms.
The receiver function can also be implemented in the PDCP protocol function layer of the L2 layer, and the PDCP function defined in the current 5G protocol has a sorting function in addition to the conventional PDCP functions (header compression, decompression, ciphering, deciphering, grouping PDU, de-PDU; RB is divided into SRB and DRB; DRB supports split dual connectivity, etc.), as shown in fig. 4, the PDCP sublayer includes:
A) and supporting the mapping routing function on the RB (SRB and DRB), that is, the existing Split DRB and Split SRB modes are not applicable to dual connectivity, but the unified RB (SRB and DRB) can be simultaneously and flexibly mapped to a plurality of lower layer channel connections (in this case, logical channels of RLC).
The route mapping function is initiated by the unified configuration of RRC signaling, and the configuration comprises the mapping relation between RB (SRB and DRB) and low-level bearer.
The mapping relation configured by the RRC signaling can be a static one-to-one mapping relation, and the establishment, the change and the contact of the relation can be controlled only by the RRC signaling; or a one-to-many semi-static mapping relationship, that is, the RRC configures more than one logical channel set for each RB, and the PDCP dynamically selects an appropriate logical channel in the logical channel set according to the data requirement on each RB monitored by the system to send, thereby implementing a routing function.
B) In-order distribution and aggregation ordering functions for data packets. The sender sends the data packets in the specified order in one or more lower layer lanes. The receiving end can receive data packets in a plurality of lower layer channels and restore the sequence of the transmitting end, and then correctly transmit the data to a control plane (SRB) or a user plane (DRB).
Distribution and aggregation function: the PDCP is required to have a flow control function so that it can reasonably transmit data packets to different lower layer channels.
In the embodiment of the invention, the scheme of multi-connection is realized by mapping a plurality of data packets to a plurality of RBs for transmission at the L2 layer, a split DRB method introduced by the existing double-connection is not needed, and the protocol function is simplified; the mapping relation is flexible and controllable, and real-time control can be achieved; when a plurality of air interface connection channels are mapped, 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 may be a terminal device. All the implementation manners in the method are applicable to the embodiment of the communication device, and the same technical effect can be achieved.
An embodiment of the present invention further provides a communication device, including: a processor, a memory storing a computer program which, when executed by the processor, performs the method as described above.
Embodiments of the present invention also provide a computer-readable storage medium including instructions that, when executed on a computer, cause the computer to perform the method as described above.
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 (26)

1. A method of data transmission, comprising:
the L2 layer of the first device receives at least one data packet;
the layer L2 maps the received at least one data packet to a plurality of transmission channels and sends the data packet to the second device;
the L2 layer of the first device receives at least one data packet sent by the second device from a plurality of transmission channels;
and according to the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, and sending the at least one sequenced data packet to the upper layer of the first equipment.
2. The data transmission method of claim 1, wherein the step of the L2 layer receiving at least one data packet comprises:
the L2 layer receives at least one service packet or signaling packet from an upper layer.
3. The data transmission method of claim 2, wherein the step of the L2 layer receiving at least one service data packet or signaling data packet from an 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 packet from the radio link control RRC sublayer of the L3 layer.
4. The data transmission method of claim 2, wherein the step of the L2 layer receiving at least one service data packet or signaling data packet from an upper layer comprises:
the service data adaptation protocol, SDAP, sublayer or the packet data convergence protocol, PDCP, sublayer of the L2 layer receives at least one service packet or signaling packet from an upper layer.
5. The data transmission method according to claim 4, wherein the step of mapping the received at least one data packet onto a plurality of transmission channels by the L2 layer and sending the at least one data packet to the second device comprises:
and 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 (RBs) according to the transmission order of the data packet, and sends the data packet to the second device.
6. 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 the plurality of radio bearers RB according to the transmission order of the data packet, and transmits the data packet to the second device, comprises:
when the data packet is a service data packet, mapping the received at least one service data packet to one or more Data Radio Bearers (DRBs) according to the transmission order of the specified data packet, and sending the DRBs to a second device; or
And when the data packet is a signaling data packet, mapping the received at least one signaling data packet to one or more Signaling Radio Bearers (SRBs) according to the transmission sequence of the specified data packet, and sending the SRBs to the second equipment.
7. The data transmission method according to claim 6, wherein the transmission order of the data packets comprises: the sequence number of the received packet may be in an ascending order, a descending order, or a random order.
8. The data transmission method according to claim 5, wherein when 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, the mapping relationship between the data packet and the radio bearer RB carrying the data packet is configured by the RRC signaling of the radio link control RRC sublayer of the L3 layer;
the mapping relationship comprises: one packet is mapped to a configured RB for transmission, or one packet is mapped to a target RB for transmission, the target RB being a selected one of a plurality of RBs.
9. The data transmission method according to claim 1, 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 a plurality of transmission channels.
10. The data transmission method according to claim 9, wherein the step of receiving, by the L2 layer of the first device, at least one of the service data packet or the signaling data packet sent by the second device from a 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 a plurality of transmission channels.
11. The data transmission method according to claim 10, wherein the step of performing resequencing on the at least one data packet according to the sequence specified by the second device to obtain at least one data packet after resequencing, and sending the at least one data packet to the upper layer of the first device comprises:
when the data packets are service data packets, performing recovery sequencing on at least one service data packet received from one or more Data Radio Bearers (DRBs) according to a sequence specified by the second device to obtain at least one sequenced service data packet, and sending the at least one sequenced service data packet to an upper layer of the first device; or
And when the data packets are signaling data packets, restoring and sequencing at least one signaling data packet received from one or more Signaling Radio Bearers (SRBs) according to the sequence specified by the second equipment to obtain at least one sequenced signaling data packet, and sending the at least one sequenced signaling data packet to the upper layer of the first equipment.
12. The data transmission method according to claim 1, wherein the step of performing resequencing on the at least one data packet according to the sequence specified by the second device to obtain at least one data packet after resequencing, and sending the at least one data packet to the upper layer of the first device comprises:
according to the sequence appointed by the second equipment, the at least one data packet is subjected to recovery sequencing to obtain at least one sequenced data packet, and the at least one sequenced data packet is routed to the corresponding QoS Flow and is sent to the upper layer of the first equipment; or
And according to the sequence of the Radio Bearer (RB) and the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, routing the sequenced data packet to the corresponding quality of service (QoS) Flow, and sending the QoS Flow to the upper layer of the first equipment.
13. A communication device, comprising:
a transceiver for receiving at least one data packet at layer L2; mapping the received at least one data packet to a plurality of transmission channels and sending the data packet to second equipment;
the transceiver is further configured to receive, at the layer L2, at least one data packet sent by the second device from a plurality of transmission channels; and according to the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, and sending the at least one sequenced data packet to the upper layer of the first equipment.
14. A communication device according to claim 13, wherein the transceiver is specifically adapted to receive at least one of traffic packets or signaling packets from an upper layer at layer L2.
15. The communications device of claim 14, wherein the transceiver is specifically configured to receive at least one service data packet from a core network at layer L2; or at least one signaling packet from the radio link control RRC sublayer of the L3 layer.
16. The communications device of claim 14, wherein said transceiver is located in a service data adaptation protocol, SDAP, sublayer or a packet data convergence protocol, PDCP, sublayer of said L2 layer.
17. The communications device of claim 16, wherein the transceiver maps the at least one received data packet to a plurality of radio bearers, RBs, in the order of transmission of the data packet, and transmits to the second device.
18. The communications device of claim 17, 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 (DRBs) according to a specified transmission order of the data packet, and transmits the DRBs to the second device; or
And 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 (SRBs) according to the transmission sequence of the specified data packet, and sends the SRBs to the second device.
19. The communications device of claim 18, wherein the transmission order of the data packets comprises: the sequence number of the received packet may be in an ascending order, a descending order, or a random order.
20. The communication device according to claim 17, wherein when the transceiver maps the at least one received data packet to a plurality of radio bearers RB according to the transmission order of the data packet, the mapping relationship between the data packet and the radio bearer RB carrying the data packet is configured by RRC signaling of the radio link control RRC sublayer of the L3 layer;
the mapping relationship comprises: one packet is mapped to a configured RB for transmission, or one packet is mapped to a target RB for transmission, the target RB being a selected one of a plurality of RBs.
21. The communications device of claim 13, wherein the transceiver is configured to receive at least one of traffic packets or signaling packets transmitted by the second device from a plurality of transmission channels.
22. The communications device of claim 13, 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 communications device.
23. The communication device of claim 13,
when the data packets are service data packets, the transceiver performs recovery sequencing on at least one service data packet received from one or more Data Radio Bearers (DRBs) according to a sequence specified by the second device to obtain at least one sequenced service data packet, and sends the at least one sequenced service data packet to an upper layer of the first device; or
And when the data packets are signaling data packets, the transceiver restores and sequences at least one signaling data packet received from one or more Signaling Radio Bearers (SRBs) according to the sequence specified by the second device to obtain at least one sequenced signaling data packet, and sends the at least one sequenced signaling data packet to the upper layer of the first device.
24. The communication device according to claim 13, wherein the transceiver is specifically configured to perform resequencing on the at least one data packet according to an order specified by the second device to obtain a sorted at least one data packet, route the sorted at least one data packet to a corresponding QoS Flow, and send the data packet to an upper layer of the first device; or
And according to the sequence of the Radio Bearer (RB) and the sequence appointed by the second equipment, recovering and sequencing the at least one data packet to obtain at least one sequenced data packet, distributing the sequenced data packet to each corresponding quality of service (QoS) Flow, and sending the sequenced data packet to an upper layer of the first equipment.
25. A communication device, comprising: a processor, a memory storing a computer program which, when executed by the processor, performs the method of any of claims 1-12.
26. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-12.
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