CN108307448B

CN108307448B - Data transmission method and equipment

Info

Publication number: CN108307448B
Application number: CN201610663631.0A
Authority: CN
Inventors: 焦斌
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-08-12
Filing date: 2016-08-12
Publication date: 2019-12-20
Anticipated expiration: 2036-08-12
Also published as: CN108307448A

Abstract

The embodiment of the invention provides a data transmission method and equipment, wherein the method comprises the following steps: under the condition that an air interface supports multi-connection, a mapping relation is established according to uplink and downlink PDU flow and one or more air interface RB bearings, and a main base station can dynamically select a transmission path of a data packet of the downlink PDU flow in a downlink direction; in the uplink direction, the UE may dynamically select an air interface RB bearer for uplink PDU flow packet transmission, and the primary base station may control some PDU flows to transmit only through the air interface RB bearer of a specific primary base station or secondary base station, thereby solving QoS and user plane data transmission under the 5G multi-connection condition.

Description

Data transmission method and equipment

Technical Field

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

Background

Referring to fig. 1, a Bearer model in an existing LTE (Long Term Evolution) system is shown, where bearers in the existing LTE involve multilayer mapping, and from one-to-one mapping between an EPS Bearer (EPS Bearer) and an Access network ERAB (evolved radio Access Bearer), and also from one-to-one mapping between the Access network ERAB and an air interface RB, a complex signaling interaction process is brought by a mapping mechanism between such multilayer bearers.

To avoid the problem of low flexibility of the QoS (Quality of Service) architecture and the complexity of the related signaling interaction in the LTE network. In a future 5G communication system, a brand-new and more flexible QoS framework model is introduced, and in addition, the future 5G access network bearing continues to use the RB concept to carry out access network side QoS guarantee, so a new mechanism needs to be introduced to realize the QoS docking of the access network and the core network, and the user plane data is guaranteed to obtain corresponding transmission QoS guarantee in the access network.

Disclosure of Invention

In view of the foregoing technical problems, embodiments of the present invention provide a data transmission method and device, which implement QoS and user plane data transmission under multiple connections.

In a first aspect, a data transmission method is provided, including:

the main base station determines the air interface RB load of the main base station and/or the auxiliary base station corresponding to the downlink PDU flow;

the main base station selects an air interface RB corresponding to the downlink PDU flow to bear and transmit a downlink data packet of the downlink PDU flow;

if one downlink PDU flow corresponds to one QoS grade, the main base station determines one air interface RB bearer of the main base station corresponding to the one downlink PDU flow, or the main base station determines one air interface RB bearer of the auxiliary base station corresponding to the one downlink PDU flow, or the main base station determines a plurality of air interface RB bearers of the main base station and the auxiliary base station corresponding to the one downlink PDU flow.

Optionally, the determining, by the primary base station, an air interface RB bearer of the primary base station and/or the secondary base station corresponding to the downlink PDU flow includes:

and the main base station triggers the establishment of an air interface RB bearer and downlink PDU flow for mapping under the main base station and/or the auxiliary base station.

Optionally, the triggering, by the primary base station, of establishing an air interface RB bearer and mapping with a downlink PDU flow under the secondary base station includes:

the main base station and the auxiliary base station carry out RB establishment interaction, and QoS parameters of RB level are sent to the auxiliary base station;

the main base station receives configuration parameters carried by an air interface RB sent by the auxiliary base station, and the configuration parameters carried by the air interface RB are generated by the auxiliary base station according to the QoS parameters of the RB level;

and the main base station triggers the establishment process of the UE establishing the empty RB bearer to the auxiliary base station, and carries the configuration parameters of the RB and the QoS parameters of the RB level.

the main base station and the auxiliary base station carry out RB establishment interaction, send RB-level QoS parameters to the auxiliary base station, generate RB configuration parameters by the auxiliary base station, trigger the establishment process of UE establishment to an air interface RB bearer of the auxiliary base station by the auxiliary base station, and carry the RB configuration parameters and the RB-level QoS parameters.

the main base station sends the QoS information of the downlink PDU flow needing to be distributed to the auxiliary base station;

and the main base station triggers the UE to establish an air interface RB bearing establishment process to the auxiliary base station according to the configuration parameters of the RB obtained from the auxiliary base station, wherein the configuration parameters of the RB are configuration parameters generated after the auxiliary base station maps the PDU flow needing to be distributed to a newly-established air interface RB bearing or the established air interface RB bearing.

Optionally, the method further comprises:

and the main base station informs the UE of the configuration of mapping the PDU flow and the empty RB bearer through the empty RB configuration parameters.

Optionally, the selecting, by the master base station, an air interface RB corresponding to the downlink PDU flow to carry and transmit the downlink data packet of the downlink PDU flow includes:

the master base station sends the downlink data packet of the downlink PDU flow to the UE through the air interface RB of the master base station, or

And the main base station forwards the downlink data packet of the downlink PDU flow to the auxiliary base station and sends the downlink data packet to the UE through the air interface RB load of the auxiliary base station.

In a second aspect, a data transmission method is further provided, including:

the terminal UE determines the empty RB bearer of the main base station and/or the auxiliary base station corresponding to the uplink PDU flow;

the UE selects an air interface RB corresponding to the uplink PDU flow to bear and transmit an uplink data packet of the uplink PDU flow;

if one uplink PDU flow corresponds to one QoS grade, the UE determines one air interface RB bearer of the main base station corresponding to the one uplink PDU flow, or the UE determines one air interface RB bearer of the auxiliary base station corresponding to the one uplink PDU flow, or the UE determines a plurality of air interface RB bearers of the main base station and the auxiliary base station corresponding to the one uplink PDU flow.

Optionally, the determining, by the UE, an air interface RB bearer of the primary base station and/or the secondary base station corresponding to the uplink PDU flow includes:

the UE acquires an air interface RB configuration parameter sent by a main base station, wherein the air interface RB configuration parameter comprises: and mapping relation between the uplink PDU flow and the air interface RB of the main base station and/or the auxiliary base station.

Optionally, the selecting, by the UE, an air interface RB corresponding to the uplink PDU flow to carry and transmit the uplink data packet of the uplink PDU flow includes:

the UE sends uplink data of uplink PDU flow to an access network through the air interface RB bearer of the main base station; or

And the UE sends the uplink data of the uplink PDU flow to an access network through the air interface RB bearer of the auxiliary base station.

Optionally, the method further comprises:

the UE acquires a mapping relation from uplink PDU flow needing to be distributed to the auxiliary base station and carried by an air interface RB of the auxiliary base station, wherein the mapping relation is notified by the main base station;

and the UE stores the mapping relation from the uplink PDU flow to the air interface RB of the auxiliary base station for the uplink data transmission process.

In a third aspect, there is provided a master base station, including:

the first determining module is used for determining the air interface RB load of the main base station and/or the auxiliary base station corresponding to the downlink PDU flow;

a first transmission module, configured to select an air interface RB corresponding to the downlink PDU flow to carry and transmit a downlink data packet of the downlink PDU flow;

Optionally, the first determining module is further configured to: and triggering to establish an air interface RB bearer and mapping a downlink PDU flow under the main base station and/or the auxiliary base station.

Optionally, the first determining module includes:

a first interaction unit, configured to perform interaction for establishing an RB with the secondary base station, and send a QoS parameter at an RB level to the secondary base station;

a first receiving unit, configured to receive configuration parameters of an air interface RB bearer sent by the secondary base station, where the configuration parameters of the air interface RB bearer are generated by the secondary base station according to the QoS parameters of the RB level;

and the first triggering unit is used for triggering the establishment process of establishing the air interface RB bearer to the auxiliary base station by the UE, and carrying the configuration parameters of the RB and the QoS parameters of the RB level.

Optionally, the first determining module includes:

and the second interaction unit is used for interacting with the auxiliary base station for establishing the RB, sending the QoS parameters of the RB level to the auxiliary base station, generating the configuration parameters of the RB by the auxiliary base station, triggering the establishment process of establishing an air interface RB bearer from the UE to the auxiliary base station by the auxiliary base station, and carrying the configuration parameters of the RB and the QoS parameters of the RB level.

Optionally, the first determining module includes:

a first sending unit, configured to send QoS information of downlink PDU flow that needs to be shunted to an auxiliary base station to the auxiliary base station;

and a second triggering unit, configured to trigger a UE to establish an air interface RB bearer establishment process to an auxiliary base station according to configuration parameters of an RB obtained from the auxiliary base station, where the configuration parameters of the RB are configuration parameters generated by the auxiliary base station after mapping a PDU flow to be shunted to a newly established air interface RB bearer or an established air interface RB bearer.

Optionally, the master base station further comprises:

and the notification module is used for notifying the configuration of mapping the PDU flow and the empty RB bearer to the UE through the empty RB configuration parameters.

Optionally, the first transmission module is further configured to: and sending the downlink data packet of the downlink PDU flow to the UE through the air interface RB bearer of the main base station, or forwarding the downlink data packet of the downlink PDU flow to the auxiliary base station, and sending the downlink data packet to the UE through the air interface RB bearer of the auxiliary base station.

In a fourth aspect, there is also provided a terminal, including:

a second determining module, configured to determine an air interface RB bearer of the primary base station and/or the secondary base station corresponding to the uplink PDU flow;

a second transmission module, configured to select an air interface RB corresponding to the uplink PDU flow to carry and transmit an uplink data packet of the uplink PDU flow;

Optionally, the second determining module is further configured to: acquiring an air interface RB configuration parameter sent by a main base station, wherein the air interface RB configuration parameter comprises: and mapping relation between the uplink PDU flow and the air interface RB of the main base station and/or the auxiliary base station.

Optionally, the second transmission module is further configured to: sending uplink data of uplink PDU flow to an access network through the air interface RB bearing of the main base station; or sending the uplink data of the uplink PDU flow to the access network through the air interface RB of the auxiliary base station.

Optionally, the terminal further includes:

an obtaining module, configured to obtain a mapping relationship, notified by the primary base station, between an uplink PDU flow that needs to be shunted to the secondary base station and an air interface RB bearer of the secondary base station;

and the storage module is used for storing the mapping relation from the uplink PDU flow to the empty RB (radio block) bearing of the auxiliary base station for the uplink data transmission process.

One of the above technical solutions has the following advantages or beneficial effects: under the condition that an air interface supports multi-connection, a mapping relation is established according to uplink and downlink PDU flow and one or more air interface RB bearings, and a main base station can dynamically select a transmission path of a data packet of the downlink PDU flow in a downlink direction; in the uplink direction, the UE may dynamically select an air interface RB bearer for uplink PDU flow packet transmission according to air interface link monitoring, and the primary base station may control some PDU flows to be transmitted only through the air interface RB bearer of a specific primary base station or secondary base station, thereby solving QoS and user plane data transmission under 5G multi-connection conditions.

Drawings

Fig. 1 is a schematic diagram of a bearer model in an existing LTE system;

FIG. 2 is a diagram of a network architecture according to an embodiment of the present invention;

FIGS. 3A and 3B are schematic diagrams of a system architecture from the perspective of a UE in an embodiment of the present invention;

FIG. 4 is a diagram illustrating a data transmission method according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating a data transmission method according to a second embodiment of the present invention;

fig. 6 is a schematic diagram of a mapping from Master NG-NB control PDU flow to multiple air interface RBs and a transmission process of downlink data in the third embodiment of the present invention;

fig. 7 is a schematic diagram of a process of controlling, by the Master NG-NB, mapping of PDU flow to multiple air interface RBs and transmitting a data packet of uplink PDU flow in the fourth embodiment of the present invention;

fig. 8 is a schematic diagram illustrating a process in which a Master NG-NB controls a Secondary NG-NB to establish an air interface RB bearer for a UE according to a fifth embodiment of the present invention;

fig. 9 is a schematic diagram of a process in which a Master NG-NB triggers a Secondary NG-NB to establish an air interface RB bearer for a UE according to a sixth embodiment of the present invention;

FIG. 10 is a diagram illustrating a process of the Master NG-NB controlling the shunting of specific downlink PDUs from flow to Secondary NG-NB according to the seventh embodiment of the present method;

fig. 11 is a schematic diagram illustrating a process of the Master NG-NB controlling the shunting of specific uplink PDU flow to the Secondary NG-NB according to an eighth embodiment of the present invention;

fig. 12 is a block diagram of a main base station according to a ninth embodiment of the present invention;

fig. 13 is a block diagram of a terminal in the tenth embodiment 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 disclosure to those skilled in the art.

As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Thus, embodiments of the invention may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.

In the embodiment of the invention, the device comprises a transmitting device and a receiving device, and downlink transmission and uplink reception can be carried out between the transmitting device and the receiving device connected with the transmitting device.

The transmitting device may be a base station or other type of transmission point device, and the receiving device may be a user device (or terminal). Of course, the present invention is not limited to the above two apparatuses, and for example, the transmitting apparatus may be a terminal capable of performing configuration operations on other terminals. A transmitting device may also be considered to comprise a plurality of network stations. The network node may include only Radio frequency (e.g., Remote Radio Unit (RRU)) or both baseband and Radio frequency (e.g., Active antenna). A network node may include only a Baseband (e.g., a Baseband Unit (BBU)); or the antenna does not include any digital/radio frequency function of an air interface layer at all, is only responsible for high-level signal processing, and puts baseband processing of the air interface layer into the intelligent antenna. Other various network implementation possibilities also exist.

A Terminal may also be referred to as User Equipment (UE), or may be referred to as Terminal, Mobile Station (MS), Mobile Terminal (RAN), and the like, and the Terminal may communicate with one or more core networks via a Radio Access Network (RAN), for example, the Terminal may be a Mobile phone (or may be referred to as a "cellular" phone), a computer with a Mobile Terminal, and the like, and for example, the Terminal may also be a portable, pocket, handheld, computer-embedded, or vehicle-mounted Mobile device, and they exchange voice and/or data with the RAN. The terminal in the embodiment of the present invention may also be a Device to Device (D2D) terminal or a Machine to Machine (M2M) terminal.

Referring to fig. 2, a network architecture is shown, which includes three logical entities, namely a CN-C (core network control plane functional entity) and a CN-U (core network user plane functional entity) located in a core network; and an access device (e.g., a next generation NodeB functional entity, NG-NB for short) located in the access network. Wherein the CN-C and the NG-NB establish an S1 × C interface for transmission of control plane signaling; and the CN-U and the NG-NB establish S1-U for user plane data transmission. An X2-point interface is established between the radio access network and the NG-NB, and the X2-point supports both control plane (e.g., X2-C) and user plane functions (e.g., X2-U).

Wherein, control plane connections with UE granularity can be established at S1 × C (where the control plane connection corresponding to each UE can be identified by S1 × AP ID), user plane connections (alternatively referred to as user plane tunnels) with PDU (packet data unit) Session granularity are established at S1 × U, and one UE can only maintain one S1-C connection with CN-C at the same time, but can establish multiple user plane connections (alternatively referred to as user plane tunnels) with PDU Session granularity at S1-U interface with CN-U at the same time.

Referring to fig. 3A and 3B, there may be one or more NG-NBs in the radio access network to serve the UE at the same time, for example, one main base station serves the UE, or the main base station and the secondary base station serve the UE at the same time (equivalent to the case of multi-connection). In the embodiment of the present invention, on the premise that the UE has only one main base station for service, more than one auxiliary base station can provide service at the same time.

The main base station (Master NG-NB) is a base station initiating bearer separation, and the auxiliary base station (Secondary NG-NB) is a base station receiving bearer separation initiated by the main base station; or, the main base station is a macro base station providing macro coverage, and the secondary base station is a local base station in the macro coverage area.

Example one

Referring to fig. 4, a data transmission method is shown, where an execution subject of the method may be the main base station in fig. 3B, and the specific steps are as follows:

step 401, the master base station determines an air interface RB bearer of the master base station and/or the secondary base station corresponding to the downlink PDU flow;

specifically, if one downlink PDU flow corresponds to one QoS class, the primary base station may determine one air interface RB bearer of the primary base station corresponding to the one downlink PDU flow, or the primary base station may determine one air interface RB bearer of the secondary base station corresponding to the one downlink PDU flow, or the primary base station may determine a plurality of air interface RB bearers of the primary base station and the secondary base station corresponding to the one downlink PDU flow.

If one downlink PDU flow corresponds to multiple QoS classes (for example, multiple downlink data packets included in the downlink PDU flow have different QoS classes), the primary base station may determine multiple air interface RB bearers of the primary base station corresponding to the one downlink PDU flow, or the primary base station may determine multiple air interface RB bearers of the secondary base station corresponding to the one downlink PDU flow, or the primary base station may determine multiple air interface RB bearers of the primary base station and the secondary base station corresponding to the one downlink PDU flow.

For example, according to a mapping relationship between one downlink PDU flow and one or more air interface RBs, the air interface RB bearer of the primary base station and/or the secondary base station corresponding to the one downlink PDU flow is determined, and the mapping relationship may be determined by the primary base station, for example, the primary base station establishes a mapping relationship between the one downlink PDU flow and one or more air interface RBs of the primary base station and/or the secondary base station according to a QoS parameter of the downlink PDU flow.

And 402, selecting an air interface RB corresponding to the downlink PDU flow by the main base station to carry and transmit the downlink data packet of the downlink PDU flow.

For example, the master base station may dynamically select an air interface RB corresponding to the downlink PDU flow to carry and transmit a downlink data packet of the downlink PDU flow based on a measurement result reported by the UE; or

And the main base station can dynamically select an air interface RB corresponding to the downlink PDU flow to carry and transmit the downlink data packet of the downlink PDU flow based on the load condition sent by the secondary base station.

In this embodiment, for one PDU session that may include different PDU flows (PDU flows), one PDU flow may be mapped to one or more air interface RB bearers located in the primary base station and/or the secondary base station for transmission.

In this embodiment, optionally, the determining, by the primary base station, an air interface RB bearer of the primary base station and/or the secondary base station corresponding to the downlink PDU flow includes:

In this embodiment, optionally, the triggering, by the primary base station, of establishing an air interface RB bearer and mapping with a downlink PDU flow under the secondary base station includes:

and the main base station triggers the establishment process of the UE establishing an air interface RB bearer to the auxiliary base station, and carries the configuration parameters of the RB and the QoS parameters of the RB level.

the main base station sends the QoS information of PDU flow needing to be distributed to the auxiliary base station;

and the main base station triggers the UE to establish an air interface RB bearer establishment process to the auxiliary base station according to the configuration parameters of the RB obtained from the auxiliary base station, wherein the configuration parameters of the RB are configuration parameters generated by the auxiliary base station after the PDU flow needing to be distributed is mapped to one or more newly-established air interface RB bearers or one or more established air interface RB bearers.

In this embodiment, optionally, the method further includes:

In this embodiment, optionally, the selecting, by the master base station, an air interface RB corresponding to the downlink PDU flow to carry and transmit the downlink data packet of the downlink PDU flow includes:

the main base station sends downlink data of downlink PDU flow to UE through the air interface RB of the main base station, or

And the main base station forwards the downlink data of the downlink PDU flow to the auxiliary base station and sends the downlink data to the UE through the air interface RB load of the auxiliary base station.

In this embodiment, when the air interface supports multiple connections, the primary base station establishes a mapping relationship with multiple air interface RB bearers according to a downlink PDU flow, and may dynamically select a transmission path of a downlink data packet of the downlink PDU flow in a downlink direction; and the main base station can control certain PDU flow to be transmitted only through the empty RB of a specific main base station or a secondary base station, and QoS and user plane data transmission under the condition of 5G multi-connection is achieved.

Example two

Referring to fig. 5, a data transmission method is shown, where an execution subject of the method may be a terminal simultaneously connected with a primary base station and a secondary base station, and the specific steps are as follows:

step 501, the UE determines an air interface RB bearer of a main base station and/or a secondary base station corresponding to the uplink PDU flow;

specifically, if one uplink PDU flow corresponds to one QoS class, the UE may determine one air interface RB bearer of the primary base station corresponding to the one uplink PDU flow, or the UE may determine one air interface RB bearer of the secondary base station corresponding to the one uplink PDU flow, or the UE may determine multiple air interface RB bearers of the primary base station and the secondary base station corresponding to the one uplink PDU flow.

If one uplink PDU flow corresponds to multiple QoS classes (for example, multiple uplink data packets included in the uplink PDU flow have different QoS classes), the UE may determine multiple air interface RB bearers of the primary base station corresponding to the one uplink PDU flow, or the UE may determine multiple air interface RB bearers of the secondary base station corresponding to the one uplink PDU flow, or the UE may determine multiple air interface RB bearers of the primary base station and the secondary base station corresponding to the one uplink PDU flow.

In this embodiment, the UE may determine the air interface RB bearer of the primary base station and/or the secondary base station corresponding to the uplink PDU flow according to a mapping relationship from the uplink PDU flow to each air interface RB bearer, where an obtaining manner of the mapping relationship may be: and the UE receives the notification of the main base station, wherein the notification carries the mapping relation.

And 502, the UE selects an air interface RB corresponding to the uplink PDU flow to bear and transmit the uplink data packet of the uplink PDU flow.

In this embodiment, optionally, the determining, by the UE, an air interface RB bearer of the primary base station and/or the secondary base station corresponding to the uplink PDU flow includes:

In this embodiment, optionally, the selecting, by the UE, an air interface RB corresponding to the uplink PDU flow to carry and transmit the uplink data packet of the uplink PDU flow includes:

the UE sends uplink data to an access network through the air interface RB bearer of the main base station; or

And the UE sends uplink data to an access network through the air interface RB bearer of the auxiliary base station.

In this embodiment, optionally, the method further includes:

Under the condition that the air interface supports multi-connection, UE establishes a mapping relation with one or more air interface RB (radio bearer) according to uplink PDU flow, dynamically selects the air interface RB for transmitting data packets of the uplink PDU flow according to monitoring of an air interface link in the uplink direction, and a main base station can control certain PDU flow to be transmitted only through the air interface RB of a specific main base station or an auxiliary base station, so that QoS (quality of service) and user plane data transmission under the condition of 5G multi-connection are achieved.

EXAMPLE III

For the case that the UE supports multi-connection, a Master NG-NB (primary base station) triggers to establish an air interface RB bearer and a PDU flow (or referred to as PDU sessionflow) under the Master NG-NB or Secondary NG-NB (Secondary base station) for mapping. When a downlink data packet of PDU flow arrives, the Master NG-NB can dynamically select the empty port RB used for downlink data transmission of PDU flow.

The Master NG-NB is a base station for initiating bearer separation, and the Secondary NG-NB is a base station for receiving bearer separation initiated by the Master NG-NB; or, the Master NG-NB is a macro base station providing macro coverage, and the Secondary NG-NB is a local base station in the macro coverage area.

Referring to fig. 6, a process of mapping the Master NG-NB control PDU flow to multiple air interface RBs and transmitting downlink data is shown in the figure, which includes the following specific steps:

step 601, a core network CN-C (core network control plane functional entity) sends a PDU Session establishment message (PDU Session establishment message) to a Master NG-NB, and triggers the Master NG-NB to establish a PDU Session, where the PDU Session establishment message includes one or more PDU flow QoS parameters (or PDU flow level QoS parameters), and the PDU flow QoS parameters may include a PDU flow identification manner (for example, through a PDU flow filtering template or through a PDU flow ID identification), an end-to-end service level requirement of the PDU flow, and a priority of the PDU flow.

It should be noted that the PDU flow may be referred to as PDU session flow.

And step 602, the Master NG-NB determines to map the PDU flow to a plurality of air interface RB bearers located in the Master NG-NB and the Secondary NG-NB. The Master NG-NB can trigger the Secondary NG-NB to establish an air interface RB bearer context.

Step 603, the Master NG-NB triggers the UE to respectively establish RB bearers to the Master NG-NB and the Secondary NG-NB. And can inform the terminal UE of the mapping relation from the downlink PDU flow to each air interface RB bearer.

And step 604, after the data packet of the downlink PDU flow reaches the Master NG-NB, the Master NG-NB can directly send the data packet to the UE through an air interface RB of the Master NG-NB.

Step 605, after the data packet of the downlink PDU flow reaches the Master NG-NB, the Master NG-NB may also forward the data packet of the downlink PDU flow to the Secondary NG-NB and send the UE through an air interface RB bearer of the Secondary NG-NB.

Example four

Referring to fig. 7, a process of controlling the mapping from PDU flow to multiple air interface RBs and transmitting a data packet of uplink PDU flow by the Master NG-NB is shown in the figure, which includes the following specific steps:

step 701, the UE or CN-C may trigger an uplink PDU flow adding process, where the uplink PDU flow adding process carries the QoS parameter of the PDU flow and the PDU Session information (PDU Session information) to which the PDU flow belongs.

And step 702, the Master NG-NB determines to map the newly added uplink PDU flow to a plurality of air interface RB bearers located in the Master NG-NB and the Secondary NG-NB. And can trigger the Secondary NG-NB to establish an air interface RB bearer context.

And step 703, the Master NG-NB notifies the UE of the mapping relationship between one PDU flow and a plurality of air interface RBs through air interface RB configuration parameters, and the UE may dynamically select an air interface RB bearer corresponding to the Master NG-NB or an air interface RB bearer corresponding to the Secondary NG-NB when performing uplink transmission of the corresponding PDU flow.

Step 704, after the uplink data packet of the uplink PDU flow arrives, the UE may decide to send the uplink data packet to the access network through the air interface RB bearer of the Master NG-NB.

Step 705, after the uplink data packet of the uplink PDU flow arrives, the UE may also send the uplink data packet to the access network through the air interface RB bearer of the Secondary NG-NB.

EXAMPLE five

For a scenario that the UE supports multi-connection, the Master NG-NB of the UE can trigger the Secondary NG-NB to establish an air interface RB for the UE, and data transmission service is provided for the UE. In this embodiment, the Master NG-NB is responsible for the RB configuration function of the UE.

Referring to fig. 8, a process of the Master NG-NB controlling the Secondary NG-NB to establish an air interface RB bearer for the UE is shown, which includes the following specific steps:

step 801, after the UE finds the Secondary NG-NG capable of providing the service at the air interface, the Master NG-NB triggers the Secondary NG-NB to establish an air interface RB bearer, and provides the data transmission service for the UE.

Step 802, the Master NG-NB and the Secondary NG-NB perform interaction about RB establishment, wherein the interaction comprises the QoS parameters of the RB (or the QoS parameters of the RB level). And generating configuration parameters of the RB by the Secondary NG-NB and informing the Master NG-NB of the configuration parameters of the RB.

Step 803, the Master NG-NB triggers the UE to establish an air interface RB bearer establishment procedure to the Secondary NG-NB, carrying configuration parameters of the RB and QoS parameters of the RB.

And step 804, after finishing the configuration of the air interface RB of the Secondary NG-NB, the UE sends the air interface RB bearer establishment completion of the Secondary NG-NB to the Master NG-NB.

EXAMPLE six

For a scenario that the UE supports multi-connection, the Master NG-NB of the UE can trigger the Secondary NG-NB to establish an air interface RB bearer for the UE, and provide a data transmission service for the terminal. In this embodiment, the Secondary NG-NB is responsible for the RB configuration function of the UE.

Referring to fig. 9, a process of triggering Secondary NG-NB by Master NG-NB to establish an air interface RB bearer for UE is shown, which includes the following specific steps:

step 901, after the UE finds the Secondary NG-NG capable of providing the service at the air interface, the Master NG-NB triggers the Secondary NG-NB to establish an air interface RB bearer, and provides the data transmission service for the UE.

And step 902, the Master NG-NB and the Secondary NG-NB perform interaction related to RB establishment, wherein the interaction includes the QoS parameters of the RB. And generating configuration parameters for the RB by the Secondary NG-NB.

Step 903, the Secondary NG-NB triggers the UE to establish an air interface RB bearer establishment procedure to the Secondary NG-NB, carrying configuration parameters of the RB and QoS parameters of the RB level.

Step 904, after the UE completes the configuration of the air interface RB bearer of the Secondary NG-NB, sending the air interface RB bearer setup completion of the Secondary NG-NB to the Secondary NG-NB.

EXAMPLE seven

Referring to fig. 10, a process of the Master NG-NB controlling the offloading of a specific downlink PDU flow to the Secondary NG-NB is shown, specifically as follows:

in step 1001, the Master NG-NB may completely offload one or more downlink PDU flows to the Secondary NG-NB for transmission. And the Master NG-NB sends the QoS parameters of the PDU flow needing to be shunted to the Secondary NG-NB. And the Secondary NG-NB maps the PDU flow needing to be shunted to a newly-built air interface RB bearer or an established air interface RB bearer, and informs the Master NG-NB of the configuration parameters of the corresponding RB. Here, it is explained that an air interface RB bearer needs to be newly established in the Secondary NG-NB. In addition, the Master NG-NB triggers the Secondary NG-NB to establish a downlink data forwarding tunnel.

And step 1002, the Master NG-NB triggers the process of establishing the air interface RB bearer from the UE to the Secondary NG-NB according to the air interface RB bearer configuration obtained from the Secondary NG-NB.

Step 1003, the UE establishes an air interface RB bearer to the Secondary NG-NB and then sends an air interface RB bearer establishment completion message to the Master NG-NB.

And step 1004, the Master NG-NB forwards the downlink data packet of the downlink PDU flow to the Secondary NG-NB, and the Secondary NG-NB sends the downlink data packet to the UE through a corresponding air interface RB bearer.

Example eight

Referring to fig. 11, a process of the Master NG-NB controlling the shunting of the specific uplink PDU flow to the Secondary NG-NB is shown, and the specific steps are as follows:

step 1101, the Master NG-NB may completely shunt one or more uplink PDU flows to the Secondary NG-NB for transmission. And the Master NG-NB sends the QoS information of the uplink PDU flow which needs to be shunted to the Secondary NG-NB. And the Secondary NG-NB maps the PDU flow needing to be shunted to a newly-built air interface RB bearer or an established air interface RB, and informs the Master NG-NB of the configuration parameters of the corresponding RB.

And the Secondary NG-NB informs the Master NG-NB of the mapping relation from the uplink PDU flow to the Secondary NG-NB air interface RB load. In addition, the Master NG-NB notifies the Secondary NG-NB of the information of the uplink forwarding tunnel, and the end point of the uplink forwarding tunnel can be the Master NG-NB or the CN-U (core network user plane functional entity).

Step 1102, the Master NG-NB triggers the UE to establish an air interface RB bearer to the Secondary NG-NB, or updates a QoS parameter of an established air interface RB bearer.

Step 1103, the Master NG-NB notifies the UE of the mapping relationship from the flow of the uplink PDU to the empty RB bearer of the Secondary NG-NB. And the UE stores the mapping relation from the flow of the uplink PDU to the empty RB bearer of the Secondary NG-NB for the uplink data transmission process.

And 1104, if the data forwarding tunnel end point allocated by the Master NG-NB for the PDU flow is the Master NG-NB, the uplink data packet is firstly forwarded to the Master NG-NB and then forwarded to the core network CN-U.

And step 1105, if the end point of the data forwarding tunnel allocated by the Master NG-NB for the PDU flow is CN-U, the uplink data packet is directly forwarded to the core network CN-U.

Example nine

Referring to fig. 12, there is shown a main base station 1200 including:

a first determining module 1201, configured to determine an air interface RB bearer of a primary base station and/or a secondary base station corresponding to a downlink PDU flow;

a first transmission module 1202, configured to select an air interface RB corresponding to the downlink PDU flow to carry and transmit the downlink data packet of the downlink PDU flow.

In this embodiment, optionally, the first determining module is further configured to: and triggering to establish an air interface RB bearer and mapping a downlink PDU flow under the main base station and/or the auxiliary base station.

In this embodiment, optionally, the first determining module includes:

a first triggering unit, configured to trigger a setup process of the UE to establish an air interface RB bearer to the auxiliary base station, where the setup process carries the configuration parameters of the RB and the QoS parameters of the RB level.

In this embodiment, optionally, the first determining module includes:

In this embodiment, optionally, the master base station further includes:

In this embodiment, optionally, the first transmission module is further configured to: and sending the downlink data packet of the downlink PDU flow to the UE through the air interface RB bearer of the main base station, or forwarding the downlink data packet of the downlink PDU flow to the auxiliary base station, and sending the downlink data packet to the UE through the air interface RB bearer of the auxiliary base station.

In this embodiment, when the air interface supports multiple connections, the primary base station establishes a mapping relationship with one or more air interface RB bearers according to the downlink PDU flow, and may dynamically select a transmission path of a downlink data packet of the downlink PDU flow in the downlink direction; and the main base station can control certain PDU flow to be transmitted only through the empty RB of a specific main base station or a secondary base station, and QoS and user plane data transmission under the condition of 5G multi-connection is achieved.

Example ten

Referring to fig. 13, a terminal is shown, the terminal 1300 comprising:

a second determining module 1301, configured to determine an air interface RB bearer of the primary base station and/or the secondary base station corresponding to the uplink PDU flow;

a second transmission module 1302, configured to select an air interface RB corresponding to the uplink PDU flow to carry and transmit the uplink data packet of the uplink PDU flow.

In this embodiment, optionally, the second determining module is further configured to: acquiring an air interface RB configuration parameter sent by a main base station, wherein the air interface RB configuration parameter comprises: and mapping relation between the uplink PDU flow and the air interface RB of the main base station and/or the auxiliary base station.

In this embodiment, optionally, the second transmission module is further configured to: sending uplink data of uplink PDU flow to an access network through the air interface RB bearing of the main base station; or sending the uplink data of the uplink PDU flow to the access network through the air interface RB of the auxiliary base station.

In this embodiment, optionally, the terminal further includes:

Under the condition that the air interface supports multi-connection, UE establishes a mapping relation with a plurality of air interface RB bearers according to uplink PDU flow, dynamically selects the air interface RB bearer for transmitting data packets of the uplink PDU flow according to monitoring of an air interface link in the uplink direction, and a main base station can control certain PDU flow to be transmitted only through the air interface RB bearer of a specific main base station or an auxiliary base station, so that QoS and user plane data transmission under the condition of 5G multi-connection is realized.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

In addition, the terms "system" and "network" are often used interchangeably herein.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network-side device) to perform some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the preferred embodiments of the present invention have been described, it should be understood that modifications and adaptations to those embodiments may occur to one skilled in the art without departing from the principles of the present invention and are within the scope of the present invention.

Claims

1. A method of data transmission, comprising:

if one downlink PDU flow corresponds to one QoS grade, the main base station determines one air interface RB bearer of the main base station corresponding to the one downlink PDU flow, or the main base station determines one air interface RB bearer of the auxiliary base station corresponding to the one downlink PDU flow, or the main base station determines a plurality of air interface RB bearers of the main base station and the auxiliary base station corresponding to the one downlink PDU flow;

the main base station is a base station initiating bearer separation, and the auxiliary base station is a base station receiving bearer separation initiated by the main base station; or, the main base station is a macro base station providing macro coverage, and the secondary base station is a local base station in the macro coverage area.

2. The method of claim 1, wherein the determining, by the primary base station, an air interface RB bearer of the primary base station and/or the secondary base station corresponding to the downlink PDU flow comprises:

3. The method of claim 2, wherein the triggering of the primary base station to establish an air interface RB bearer and downlink PDU flow under the secondary base station for mapping comprises:

4. The method of claim 2, wherein the triggering of the primary base station to establish an air interface RB bearer and downlink PDU flow under the secondary base station for mapping comprises:

5. The method of claim 2, wherein the triggering of the primary base station to establish an air interface RB bearer and downlink PDU flow under the secondary base station for mapping comprises:

6. The method of claim 1, further comprising:

7. The method of claim 1,

the main base station selects an air interface RB corresponding to the downlink PDU flow to bear and transmit the downlink data packet of the downlink PDU flow, and the method comprises the following steps:

8. A method of data transmission, comprising:

if one uplink PDU flow corresponds to one QoS grade, the UE determines one air interface RB bearer of a main base station corresponding to the one uplink PDU flow, or the UE determines one air interface RB bearer of an auxiliary base station corresponding to the one uplink PDU flow, or the UE determines a plurality of air interface RB bearers of the main base station and the auxiliary base station corresponding to the one uplink PDU flow;

9. The method of claim 8, wherein the determining, by the UE, the air interface RB bearer of the primary base station and/or the secondary base station corresponding to the uplink PDU flow comprises:

10. The method of claim 8, wherein the selecting, by the UE, the air interface RB corresponding to the uplink PDU flow to carry the uplink data packet of the uplink PDU flow for transmission comprises:

11. The method of claim 8, further comprising:

12. A master base station, comprising:

13. The master base station of claim 12, wherein the first determining module is further configured to: and triggering to establish an air interface RB bearer and mapping a downlink PDU flow under the main base station and/or the auxiliary base station.

14. The master base station of claim 13, wherein the first determining module comprises:

15. The master base station of claim 13, wherein the first determining module comprises:

16. The master base station of claim 13, wherein the first determining module comprises:

17. The master base station of claim 12, further comprising:

18. The master base station of claim 12, wherein the first transmission module is further configured to: and sending the downlink data packet of the downlink PDU flow to the UE through the air interface RB bearer of the main base station, or forwarding the downlink data packet of the downlink PDU flow to the auxiliary base station, and sending the downlink data packet to the UE through the air interface RB bearer of the auxiliary base station.

19. A terminal, comprising:

20. The terminal of claim 19, wherein the second determining module is further configured to: acquiring an air interface RB configuration parameter sent by a main base station, wherein the air interface RB configuration parameter comprises: and mapping relation between the uplink PDU flow and the air interface RB of the main base station and/or the auxiliary base station.

21. The terminal of claim 19, wherein the second transmission module is further configured to: sending uplink data of uplink PDU flow to an access network through the air interface RB bearing of the main base station; or sending the uplink data of the uplink PDU flow to the access network through the air interface RB of the auxiliary base station.

22. The terminal of claim 19, wherein the terminal further comprises: