WO2020087500A1

WO2020087500A1 - Data transmission method and device

Info

Publication number: WO2020087500A1
Application number: PCT/CN2018/113689
Authority: WO
Inventors: 单宝堃; 王宏
Original assignee: 华为技术有限公司
Priority date: 2018-11-02
Filing date: 2018-11-02
Publication date: 2020-05-07

Abstract

Disclosed by the embodiments of the present application are a data transmission method and device, said method comprising: a terminal device receiving a radio network temporary identification (RNTI) from a network device; the terminal device monitoring a PDCCH scrambled by the RNTI at the paging occasion, the PDCCH being used for scheduling downlink data of the terminal device. Using the embodiments of the present application, it is possible to reduce the signaling overhead of downlink data transmission, reducing the power consumption of a terminal device.

Description

Data transmission method and equipment

Technical field

This application relates to the field of communication technology, and in particular, to a data transmission method and device.

Background technique

When user equipment (User Equipment, UE) (or terminal equipment) receives downlink data (generally indicating user plane data User Data) sent by evolved Node B (eNB) (or network equipment), UE is required An RRC connection is established with the eNB, and data transmission is performed in the RRC connected state. For eMTC or NB-IoT applications, the amount of data is generally small. After the RRC connection is established, the smaller data is transmitted, so that most of the resources and UE power consumption are used for the RRC connection establishment process, the resources used to transmit data and The UE has less power consumption and low data transmission efficiency.

Summary of the invention

Embodiments of the present application provide a data transmission method and device, which are used to improve data transmission efficiency.

In a first aspect, an embodiment of the present application provides a data transmission method, including:

The terminal device receives the wireless network temporary identification RNTI from the network device;

The terminal device monitors the scheduling information scrambled by the RNTI at the paging moment PO, and the scheduling information is used to schedule downlink data of the terminal device.

As an optional implementation manner, the method further includes: the terminal device receives the downlink data.

As an optional implementation manner, the RNTI is an RNTI dedicated to terminal equipment or an RNTI dedicated to paging.

As an optional implementation manner, the terminal device monitoring the scheduling information of the RNTI scrambling at the paging moment PO includes: the terminal device is idle in idle state and monitoring the RNTI scrambling at the PO The scheduling information.

As an optional implementation manner, the terminal device monitoring the scheduling information of the RNTI scrambling at the paging moment PO includes: the terminal device monitoring the RNTI scrambling in the public search space CSS and the PO The scheduling information; or, the terminal device monitors the scheduling information scrambled by the RNTI in a search space USS dedicated to the terminal device and at a paging moment PO.

In a second aspect, an embodiment of the present application provides another data transmission method, including:

The network device sends the wireless network temporary identification RNTI to the terminal device;

The network device sends the RNTI scrambled scheduling information to the terminal device at a paging moment PO, and the scheduling information is used to schedule downlink data of the terminal device.

As an optional implementation manner, the method further includes: the network device sending the downlink data to the terminal device.

As an optional implementation manner, the network device sends the RNTI scrambled scheduling information to the terminal device at the paging moment PO, including: The terminal device sends the scheduling information scrambled by the RNTI; or, the network device sends the scheduling information scrambled by the RNTI to the terminal device in a search space USS dedicated to the terminal device and at a paging moment .

In a third aspect, an embodiment of the present application further provides a communication device, including a processor and a memory;

The processor is used to read and execute instructions from the memory to implement the method described in the first aspect.

According to a fourth aspect, an embodiment of the present application further provides a communication device, including a processor and a memory;

The processor is used to read and execute instructions from the memory to implement the method described in the second aspect.

According to a fourth aspect, an embodiment of the present application further provides a computer storage medium, including a program, for implementing the method according to the first aspect or the second aspect when the communication device runs the program.

According to a fifth aspect, an embodiment of the present application further provides a computer program product, including a program, for implementing the method according to the first aspect or the second aspect when the communication device runs the program.

In the embodiment of the present application, the scheduling information for scheduling downlink data is delivered through the PO moment, which can avoid the RRC connection process, thereby reducing the terminal device power consumption and improving the resource utilization efficiency.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments or the background technology of the present application, the drawings required in the embodiments or the background technology of the present application will be described below.

FIG. 1 is a schematic diagram of an application scenario of a communication system according to an embodiment of the present application;

2 is a schematic diagram of a data transmission method according to an embodiment of the present application;

3 is a schematic diagram of another data transmission method according to an embodiment of the present application;

4 is a schematic diagram of still another data transmission method according to an embodiment of the present application;

5 is a schematic structural diagram of a communication device according to an embodiment of the present application.

detailed description

The following describes the embodiments of the present application with reference to the drawings in the embodiments of the present application.

Please refer to FIG. 1, which is a schematic diagram of a communication system application scenario disclosed in an embodiment of the present application. The communication system can apply LTE network or Next Generation (NR or 5G) network. As shown in FIG. 1, the terminal device accesses the network through a network device, such as an evolved base station (Evolved Node B, eNB) in LTE, and interacts with the eNB to realize data transmission and reception. In a 5G system, the base station may also be a 5G base station gNB.

The foregoing terminal device may be a mobile phone, an intelligent terminal, a multimedia device, a streaming media device, etc., and the embodiments of the present application are not limited. The above eNB is a bridge between the user terminal in the LTE network and the evolved packet core (Evolved Packet Core, EPC). The eNBs are connected through the X2 interface. Its main functions are: radio resource management, IP header compression and User data stream encryption, Mobility Management Entity (MME) selection when user terminal is attached, routing user plane data to Serving Gateway (S-GW), organization and sending of paging messages, broadcasting of messages Organization and sending, measurement and measurement report configuration for the purpose of mobility or scheduling, etc.

Example one

Referring to FIG. 2, FIG. 2 is a schematic flowchart of a data transmission method disclosed in an embodiment of the present application. The execution subject of this method is the terminal device.

S101. The terminal device receives the wireless network temporary identifier RNTI from the network device;

Here, the terminal device is described using the UE as an example, and the network device is described using the eNB as an example.

In order to quickly receive downlink data from the eNB, the UE may receive the RNTI from the eNB in advance. The RNTI is used to scramble the PDCCH, and the PDCCH is used to schedule the downlink data. The RNTI may be a UE-specific RNTI, such as C-RNTI; or, the RNTI is a paging-specific RNTI, such as P-RNTI. The UE may use the received RNTI to receive downlink data.

S102. The terminal device monitors the PDCCH scrambled by the RNTI at the paging moment PO.

When the UE is in the idle state, the PO monitors the P-RNTI scrambled PDCCH at the paging moment to receive the Paging message scheduled by the PDCCH. The Paging message is carried on PDSCH. In order for the UE to quickly receive downlink data, the UE may monitor the RNTI scrambled PDCCH at the PO, and the PDCCH is used to schedule downlink data, for example, the downlink data is user plane data.

By implementing the embodiments of the present application, the RRC connection process can be avoided, thereby reducing the power consumption of the terminal device and improving the resource utilization efficiency.

FIG. 3 is a schematic flowchart of a data transmission method disclosed in an embodiment of the present application.

S301. The terminal device receives the wireless network temporary identifier RNTI from the network device;

Optionally, the RNTI is carried in an RRC connection reconfiguration (RRC Connection Reconfiguration) message or an RRC connection release (RRC Connection Release) message or an RRC early transmission data completion (RRC Early Data Request) message.

Optionally, the terminal device receives the RNTI from the network device in the connected state.

Optionally, after receiving the RNTI, the terminal device enters the idle state Idle. In the idle state, the terminal device and / or network device stores the RNTI, and the network device stores the RNTI and the identification of the terminal device, so that the network device can determine the RNTI allocated to the terminal device based on the identification of the terminal device, or, So that the network device can determine the identity of the terminal device according to the allocated RNTI.

S302. The network device receives the paging message and downlink data from the core network device.

Before S302, optionally, the core network device obtains downlink data from the gateway, where the downlink data is downlink data of the terminal device.

The core network device sends a paging message and downlink data to the network device. In a possible implementation, the core network device sends the paging message and downlink data to the network device through one message or two messages. For example, the core network device first sends a paging message to the network device, and then sends downlink data to the network device.

The paging message carries the identification of the terminal device, such as S-TMSI.

S303. The terminal device monitors the PDCCH scrambled by the RNTI at the paging moment PO.

After receiving the paging message from the core network device, the network device determines that the terminal device has downlink data arriving according to the terminal device identifier in the paging message.

The network device determines the RNTI allocated to the terminal device according to the terminal device identifier in the paging message. The network device uses the determined RNTI to scramble the PDCCH, which is used to schedule downlink data. The network device sends the PDCCH to the terminal device at the paging moment PO.

Accordingly, the terminal device monitors the PDCCH scrambled by the RNTI at the paging moment PO. If the RNTI scrambled PDCCH is detected, the downlink data is received according to the scheduling of the PDCCH.

Optionally, the network device may send the PDCCH in a common search space (Common Search Space, CSS). Alternatively, the network device may send the PDCCH in a terminal-specific search space (UE-specific Search Space, USS).

The PDCCH may be MPDCCH (MTC PDCCH) or NPDCCH (Narrowband PDCCH).

S304. The terminal device receives downlink data from the network device.

This step is optional. If the terminal device monitors the PDCCH scrambled by the RNTI at S303, it receives downlink data scheduled by the PDCCH at this step.

S305. The terminal device sends downlink data feedback to the network device.

This step is optional. If the terminal device receives downlink data in S304, the terminal device sends downlink data feedback to the network device in step S305, such as HARQ-ACK or HARQ-NACK, or ARQ-ACK or ARQ-NACK.

S306. The network device sends downlink data feedback to the core network device.

This step is an optional step. If the network device receives downlink data feedback from the terminal device at S305, the network device may send downlink data feedback to the core network device.

FIG. 4 is a schematic flowchart of a data transmission method disclosed in an embodiment of the present application.

S401. The terminal device receives the wireless network temporary identifier RNTI from the network device;

Optionally, the RNTI carries an RRC connection reconfiguration (RRC Connection Reconfiguration) message or an RRC connection release (RRC Connection Release) message or an RRC Early Data Complete (RRC Early Data Request) message.

S302. The network device receives the paging message from the core network device.

Before S302, optionally, the core network device obtains a downlink data notification from the gateway, where the downlink data notification is used to indicate that downlink data arrives at the terminal device.

The core network device sends a paging message to the network device, and the paging message carries the identifier of the terminal device, for example, S-TMSI.

S403. The network device restores the terminal device context and activates security.

After receiving the paging message from the core network device, the network device determines that the terminal device has downlink data arriving according to the terminal device identifier in the paging message. The network device determines the terminal device context according to the terminal device identifier in the paging message, and restores the UE context and activates security.

This step may also be located between S405 and S406.

S404. The network device sends a terminal device context recovery request to the core network device.

In S402, the network device determines the terminal device according to the paging message. In S404, the network device sends a terminal device context recovery request to the core network device, for example, UE Context Resume Request, which is used to request the core network device to restore the context of the terminal device.

S405. The network device receives the terminal device context recovery response from the core network device.

The core network device restores the terminal device context according to the terminal device context recovery request received in S404, and sends a terminal device context recovery response to the network device, such as UEContextResumeResponse, used to notify the network device to restore the terminal device Context.

S406. The network device obtains downlink data from the gateway.

In S405, after recovering the context of the terminal device, the network device acquires the downlink data of the terminal device from the gateway.

S407. The terminal device monitors the PDCCH scrambled by the RNTI.

The network device determines the RNTI of the terminal device according to the identifier of the terminal device in the paging message.

The network device uses the determined RNTI to scramble the PDCCH, which is used to schedule downlink data. The network device sends the PDCCH to the terminal device at the paging moment PO.

The PDCCH may be MPDCCH (MTC PDCCH) or NPDCCH (Narrowband PDCCH).

S408. The terminal device receives downlink data from the network device.

This step is an optional step. If the terminal device monitors the PDCCH scrambled by the RNTI at S407, it receives downlink data scheduled by the PDCCH at this step.

S409. The terminal device sends downlink data feedback to the network device.

This step is optional. If the terminal device receives downlink data in S408, the terminal device sends downlink data feedback to the network device in S409, such as HARQ-ACK or HARQ-NACK, or ARQ-ACK or ARQ-NACK.

An embodiment of the present application further provides a communication device, including a processor and a memory, for implementing the functions of the terminal device in FIG. 2, FIG. 3, or FIG. 4.

An embodiment of the present application further provides a communication device, including a processor and a memory, for implementing the functions of the network device shown in FIG. 3 or FIG. 4. The network device may be a base station.

The structure of the above communication device may be as shown in FIG. 5.

An embodiment of the present application further provides a computer storage medium, including a program, for implementing related functions of the terminal device or network device as shown in FIG. 2, or FIG. 3, or FIG. 4 when the communication apparatus runs the program.

An embodiment of the present application further provides a computer program product, including a program, for implementing related functions of a terminal device or a network device as shown in FIG. 2, or FIG. 3, or FIG. 4 when the communication apparatus runs the program.

Those skilled in the art can clearly understand that, for convenience and conciseness of description, only the above-mentioned division of each functional module is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated by different functional modules according to needs, that is, the device The internal structure of is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

A person of ordinary skill in the art can understand that in various embodiments of the present application, the size of the sequence numbers of the above processes does not mean that the execution order is sequential, and the execution order of each process should be determined by its function and inherent logic, not The implementation process of the embodiments of the present application shall constitute any limitation.

In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions according to the embodiments of the present invention are generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmit to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including a server, a data center, and the like integrated with one or more available media. The usable medium may be a magnetic medium (eg, floppy disk, hard disk, magnetic tape), optical medium (eg, DVD), or semiconductor medium (eg, solid state disk (SSD)), or the like.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not deviate from the essence of the corresponding technical solutions of the technical solutions of the embodiments of the present application. range.

Claims

A data transmission method, characterized in that it includes:

The terminal device receives the wireless network temporary identification RNTI from the network device;

The terminal device monitors the scheduling information scrambled by the RNTI at the paging moment PO, and the scheduling information is used to schedule downlink data of the terminal device.
The method according to claim 1, wherein the method further comprises:

The terminal device receives the downlink data.
The method according to claim 1 or 2, wherein the RNTI is an RNTI dedicated to terminal equipment or an RNTI dedicated to paging.
The method according to any one of claims 1 to 3, wherein the terminal device monitoring the scheduling information scrambled by the RNTI at the paging moment PO includes:

The terminal device is in the idle state Idle and monitors the scheduling information scrambled by the RNTI at the PO.
The method according to any one of claims 1-4, wherein the terminal device monitoring the scheduling information scrambled by the RNTI at the paging moment PO includes:

The terminal device monitors the scheduling information scrambled by the RNTI in the common search space CSS and in the PO; or,

The terminal device monitors the scheduling information scrambled by the RNTI in the search space USS dedicated to the terminal device and at the paging moment PO.
A data transmission method, characterized in that it includes:

The network device sends the wireless network temporary identification RNTI to the terminal device;

The network device sends the RNTI scrambled scheduling information to the terminal device at a paging moment PO, and the scheduling information is used to schedule downlink data of the terminal device.
The method according to claim 6, wherein the method further comprises:

The network device sends the downlink data to the terminal device.
The method according to claim 6 or 7, wherein the RNTI is an RNTI dedicated to terminal equipment or an RNTI dedicated to paging.
The method according to any one of claims 6-8, wherein the network device sending the RNTI scrambled scheduling information to the terminal device at the paging moment PO includes:

The network device sends the scheduling information scrambled by the RNTI to the terminal device in the common search space CSS and at the PO; or,

The network device sends the RNTI scrambled scheduling information to the terminal device in a search space USS dedicated to the terminal device and at a paging moment PO.
A communication device, characterized in that it includes a processor and a memory;

The processor is used to read and execute instructions from the memory to implement the method according to any one of claims 1-5.
A communication device, characterized in that it includes a processor and a memory;

The processor is used to read and execute instructions from the memory to implement the method according to any one of claims 6-9.
A computer storage medium includes a program for implementing the method according to any one of claims 1-9 when the communication device runs the program.