WO2018027938A1

WO2018027938A1 - Data transmission method, apparatus and system

Info

Publication number: WO2018027938A1
Application number: PCT/CN2016/094968
Authority: WO
Inventors: 杨晓东; 李秉肇; 张戬
Original assignee: 华为技术有限公司
Priority date: 2016-08-12
Filing date: 2016-08-12
Publication date: 2018-02-15
Also published as: CN109644475A

Abstract

Disclosed in the present invention are a data transmission method, an apparatus and a system. The data transmission method comprises: instructing, by a base station, whether a terminal device, which is in a lightly connected status, needs to perform uplink synchronization; when the base station needs to send downlink data to the terminal device that is in the lightly connected status, sending, by the base station, scheduling information to the terminal device, wherein the scheduling information carries an identifier that is allocated by the base station for the terminal device, the identifier being used by the terminal device to identify the scheduling information; sending, by the base station, the downlink data to the terminal device by using the resource instructed by the scheduling information; and receiving, by the base station, feedback information sent by the terminal device that is in an uplink synchronization status, wherein the feedback information reflects a reception situation of the downlink data. Therefore, it can be guaranteed that the terminal device receives the downlink data sent by the base station in time, saving network resources, and improving data transmission efficiency.

Description

Data transmission method, device and system

Technical field

The present invention relates to wireless communication technologies, and in particular, to a data transmission method, apparatus and system.

Background technique

In the network, the state in which the terminal device is located generally includes a Radio Resource Control (RRC) connected state and an idle (Idle) state. An RRC connection is established between the terminal device in the connected state and the base station, and data can be transmitted. The terminal device in the idle state has no connection with the base station and cannot send data. The terminal device in the idle state can establish an RRC connection with the base station and obtain a context related to the connection configuration, and enter the connection state to implement data transmission. The terminal device in the connected state can also release the RRC connection and clear the context, thereby entering the idle state.

The 3rd Generation Partnership Project (3GPP) is discussing the Light Connection status. The terminal device can enter the light connection state under the direction of the base station. The light connection state is a state between a connected state and an idle state. The terminal device entering the light connection state and the base station both save the context of the terminal device. And, the base station allocates a connection recovery identifier to the terminal device. When the terminal device needs to resume the normal RRC connection state with the base station, the terminal device sends a request message carrying the connection recovery identifier to the base station. Determining, by the base station, the terminal device that initiates the RRC connection recovery request according to the connection recovery identifier, and restoring the RRC connection with the terminal device by using the saved context.

Receiving downlink data by a terminal device in a light connection state is generally implemented by restoring an RRC connection. When the base station has downlink data to be sent, the paging is triggered. After the terminal device detects the paging for itself, it triggers the RRC connection recovery process, and receives the downlink data after the connection state is restored. In the foregoing process, the terminal device continuously monitors the paging from the base station, and needs to restore the RRC connection before receiving the downlink data, thereby reducing data transmission efficiency.

Summary of the invention

The present invention provides a data transmission method, device and system, which enable a terminal device to complete downlink data reception in a light connection state and improve data transmission efficiency.

In one aspect, embodiments of the present invention provide a data transmission method. The method includes the base station indicating whether a terminal device in a light connection state needs to perform uplink synchronization. When the base station needs to send downlink data to the terminal device in the light connection state, the base station sends scheduling information to the terminal device, where the scheduling information carries the identifier allocated by the base station to the terminal device . The identifier is used by the terminal device to identify the scheduling information. The base station sends the downlink data to the terminal device by using the resource indicated by the scheduling information. The base station receives feedback information sent by the terminal device in an uplink synchronization state, where the feedback information reflects a reception status of the downlink data. Through the method provided in this embodiment, the terminal device can complete the downlink data reception in time in the light connection state, thereby improving data transmission efficiency.

In a possible design, before the base station sends the scheduling information to the terminal device, the base station further includes the base station instructing the terminal device to enter a light connection state.

In a possible design, before the base station sends the scheduling information to the terminal device, the base station further includes receiving, by the base station, a preamble sequence code sent by the terminal device that is moved to the serving cell of the base station. The base station sends a random access response to the terminal device, where the random access response includes the identifier allocated by the base station to the terminal device.

In a possible design, the base station indicates whether the terminal device needs to perform uplink synchronization by using a broadcast message or a pre-arrangement with the terminal device.

In a possible design, the identifier includes a group identifier and a terminal device identifier, where the group identifier is used to uniquely identify a terminal device group in which the terminal device is located, and the terminal device identifier is used in the group The terminal device is uniquely identified.

In a possible design, the scheduling information carrying the identifier allocated by the base station to the terminal device includes: the base station using the group identifier to scramble a physical downlink control channel that sends the scheduling information, where The terminal device identifier is included in the scheduling information.

In a possible design, if the base station indicates that the terminal device needs to perform uplink synchronization, before the base station receives the feedback information sent by the terminal device in an uplink synchronization state, the base station further includes the base station receiving the The preamble sequence code sent by the terminal device. The base station sends a random access response to the terminal device, where the random access response includes an uplink resource allocated by the base station to the terminal device. The feedback information is transmitted by the terminal device by using the uplink resource.

In another aspect, embodiments of the present invention provide a data transmission method. The method includes determining, by the terminal device, whether the uplink needs to be performed in the light connection state according to the indication of the base station Step and handle accordingly. The terminal device in a light connection state receives scheduling information sent by the base station, where the scheduling information carries an identifier allocated by the base station to the terminal device, and the identifier is used by the terminal device to identify the scheduling information. The terminal device receives downlink data sent by the base station by using the resource indicated by the scheduling information. The terminal device in an uplink synchronization state sends feedback information to the base station, where the feedback information reflects a reception status of the downlink data. Through the method provided in this embodiment, the terminal device can complete the downlink data reception in time in the light connection state, thereby improving data transmission efficiency.

In a possible design, before the terminal device receives the scheduling information sent by the base station, the method further includes the terminal device entering a light connection state under the indication of the base station.

In a possible design, before the terminal device in the light connection state receives the scheduling information sent by the base station, the method further includes the terminal device sending a preamble sequence to the base station after moving to the serving cell of the base station code. Receiving, by the terminal device, a random access response sent by the base station, where the random access response includes the identifier allocated by the base station to the terminal device.

In a possible design, the terminal device determines whether uplink synchronization needs to be performed in a light connection state by receiving a broadcast message or a pre-agreed with the base station.

In a possible design, the terminal device in a light connection state receives the The scheduling information sent by the base station includes the physical downlink channel descrambling of the terminal device to send the scheduling information by using the group identifier. The terminal device decodes the scheduling information, where the scheduling information includes the terminal device identifier.

In a possible design, if the terminal device determines that uplink synchronization needs to be performed, performing corresponding processing includes, before the terminal device in an uplink synchronization state sends feedback information to the base station, the terminal device The base station transmits a preamble sequence code. The terminal device receives a random access response sent by the base station, where the random access response includes an uplink resource allocated by the base station to the terminal device. The feedback information is transmitted by the terminal device by using the uplink resource.

In another aspect, an embodiment of the present invention provides a base station, where the base station performs the data transmission method described in the foregoing aspect. The base station includes a processing unit, a transmitting unit, and a receiving unit. The processing unit is configured to indicate whether the terminal device in the light connection state needs to perform uplink synchronization. The sending unit is configured to send scheduling information to the terminal device when the downlink data needs to be sent to the terminal device in the light connection state, where the scheduling information carries the processing unit that is allocated by the processing unit for the terminal device And an identifier, where the identifier is used by the terminal device to identify the scheduling information. The sending unit is further configured to send the downlink data to the terminal device by using the resource indicated by the scheduling information. The receiving unit is configured to receive feedback information sent by the terminal device in an uplink synchronization state, where the feedback information reflects a receiving situation of the downlink data.

In a possible design, the base station can implement the function of the behavior of the base station in the above method by hardware. The structure of the base station may include a processor, a receiver, and a transmitter, and respectively implement functions of the processing unit, the receiving unit, and the sending unit.

In a possible design, the base station may also implement corresponding functions in hardware to implement the function of the base station in the foregoing method. The hardware or software includes one or more modules corresponding to the functions described above. The modules can be software and/or hardware.

In still another aspect, an embodiment of the present invention provides a terminal device that performs the data transmission method described in the above aspect. The terminal device includes a processing unit, a receiving unit, and a transmitting unit. The processing unit is configured to determine, according to an indication of the base station, whether uplink synchronization needs to be performed in a light connection state, and perform corresponding processing. The receiving unit is configured to receive scheduling information sent by the base station, where the scheduling information carries an identifier that is sent by the base station to the terminal device. The identifier is used by the terminal device to identify the scheduling information. The receiving unit is further configured to receive downlink data sent by the base station by using the resource indicated by the scheduling information. The sending unit is configured to send feedback information to the base station when the terminal device is in an uplink synchronization state, where the feedback information reflects a receiving situation of the downlink data.

In a possible design, the terminal device can implement the function of the behavior of the terminal device in the above method by hardware. The structure of the terminal device may include a processor, a receiver, and a transmitter, and the functions of the processing unit, the receiving unit, and the sending unit may be implemented separately.

In a possible design, the terminal device can also implement the function of the terminal device in the above method by executing corresponding software through hardware. The hardware or software includes one or more modules corresponding to the functions described above. The modules can be software and/or hardware.

In another aspect, an embodiment of the present invention provides a communication system, where the communication system includes the base station and the terminal device in the foregoing aspect.

In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the terminal device, including a program designed to perform the above aspects.

In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use by the base station, including a program designed to perform the above aspects.

According to the technical solution provided by the embodiment of the present invention, the base station sends downlink data to the terminal device in a light connection state by using a scheduling manner. The terminal device sends feedback information after determining whether uplink synchronization needs to be performed. Therefore, the terminal device can ensure timely receiving downlink data in the light connection state, thereby improving the efficiency of data transmission.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the description of the embodiments will be briefly described below. It will be apparent that the drawings described below are only some of the embodiments of the present invention, and other drawings may be obtained from those skilled in the art in light of the scope of the invention.

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

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

FIG. 3 is a schematic diagram of a data transmission method according to another embodiment of the present invention; FIG.

FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a base station according to another embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a terminal device according to another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of them. It is to be understood that other embodiments obtained by combining the technical features in the embodiments or the embodiments are also included in the scope of the present invention without ambiguity or contradiction.

The technical solution proposed by the embodiment of the present invention is based on the communication system 100 shown in FIG. 1. The communication system 100 includes at least two base stations (BSs) and at least one terminal device. Wherein each base station serves at least one cell. The terminal device moves between cells served by the base station.

The terminal device that maintains a Radio Resource Control (RRC) connection with the base station may enter a light connection state under the instruction of the base station. The light connection state may be a substate of a connected state, an enhanced state of an idle state, or an independent state. The light connection state may also be referred to as an inactive state, a deactivated state, a low active state, a low overhead state, and the like. The embodiment of the present invention does not specifically limit the form and name of the light connection state. The terminal device in the light connection state saves the context related to the connection configuration and performs mobility based on cell reselection.

The base station and the terminal device entering the light connection state both save the context of the terminal device. The context may include connection configuration parameters between the base station and the terminal device. Specifically, the connection configuration parameter may include a radio bearer configuration of the terminal device, where the radio bearer configuration includes a signaling radio bearer configuration and/or a data radio bearer configuration. The context may also contain key information for use in performing encrypted transmissions or when generating terminal device authentication information.

When the terminal device entering the light connection state changes the camped cell, the base station does not need to make a handover indication, but determines the camped cell by itself based on the cell reselection criterion. For example, when the terminal device measures a cell with better signal quality or higher strength, it may choose to camp in the cell. The terminal device provides a data transmission service by the serving base station of the cell in the camped cell.

In the communication system 100 shown in FIG. 1, for example,

base stations

10, 11 and a terminal device 20 are included. The base station 10 is a serving base station of the cell A. The base station 11 is a serving base station of the cell B. It can be understood that the base station 10 and the base station 11 can serve more cells, not limited to the cell A and the cell B. The terminal device 20 enters a light connection state under the direction of the base station 10. Thereafter, the terminal device 20 may move to the cell B based on cell reselection. In cell B, the terminal device provides a data transmission service by the base station 11.

In the embodiment of the present invention, the communication system 100 may be a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, or a Wideband Code Division Multiple Access (Wideband Code Division). Multiple Access, WCDMA) System, General Packet Radio Service (General Packet Radio Service, GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Communication System (Universal Mobile) Telecommunication System (UMTS), and other wireless communication systems using orthogonal frequency division (OFDM) technology. Furthermore, the communication system 100 can also be adapted for future-oriented communication technologies. The system architecture and the service scenario described in the embodiments of the present invention are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present invention, and do not constitute a limitation of the technical solutions provided by the embodiments of the present invention. The technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

In the embodiment of the present invention, the terminal device 20 may also be referred to as a user equipment (User Equipment, UE), a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), etc., and the terminal device may be connected to the radio access network (Radio). The Access Network, RAN) communicates with one or more core networks. For example, the terminal device may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, etc., and may also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device with wireless access. Network exchange language and / or data. The embodiment of the present invention does not specifically limit the terminal device.

In the embodiment of the present invention, the

base stations

10 and 11 may be base stations (Base Transceiver Stations, BTSs) in GSM or CDMA, base stations (NodeBs, NBs) in WCDMA, and evolved base stations in LTE (Evolutional Node B, eNB or e-NodeB), and may be a corresponding next generation base station in the 5G network (next Generation Node B, gNB). For convenience of description, the base station is not specifically limited in all embodiments of the present invention, and the foregoing devices for providing wireless communication functions for the terminal device are collectively referred to as a base station.

It should be noted that the number of base stations and terminal devices included in the communication system 100 shown in FIG. 1 is merely an example, and the embodiment of the present invention is not limited thereto. For example, it is also possible to include more base stations and terminal devices that communicate with the base stations, which are not described in the drawings for the sake of brevity. Further, in the communication system 100 shown in FIG. 1, although the

base stations

10, 11 and the terminal device 20 are shown, the communication system 100 may not be limited to include the base station and the terminal device, and may also include a core, for example. Network devices or devices for carrying virtualized network functions are not detailed here.

It should be noted that, in the embodiment of the present invention, the terminal device moves between the resource configuration area or the resource configuration area. The resource configuration area includes at least one cell served by at least one base station. The terminal device configures the same parameter when moving in the resource configuration area. The parameters are transmitted between the base stations in the resource configuration area through an X2 interface or an S1 interface. The parameter includes the RRC of the terminal device, a Packet Data Convergence Protocol (PDCP), a Radio Link Control (RLC), and a media access control (MAC). And at least one of the physical layer parameters. For example, the cell A and the cell B shown in FIG. 1 may belong to the same resource configuration area, and the terminal device does not need to reconfigure parameters after moving from the cell A to the cell B, thereby saving network resources. The cell A and the cell B may also belong to different resource configuration areas, and the terminal device needs to reconfigure parameters after moving to the cell B.

FIG. 2 is a schematic diagram of a data transmission method provided by an embodiment of the present invention. The method provided in this embodiment will be described in detail from the perspective of interaction with FIG. 2 below.

S201. The base station indicates whether the terminal device in the light connection state needs to perform uplink synchronization.

The terminal device determines, in the serving cell of the base station, whether the uplink synchronization needs to be performed first when the terminal device has an uplink transmission requirement by using the indication of the base station.

Specifically, the terminal device may determine whether uplink synchronization needs to be performed by receiving a broadcast message in a serving cell of the base station.

The terminal device may also determine whether uplink synchronization needs to be performed by a pre-agreed with the base station. For example, when the base station configures parameters for the terminal device, it indicates whether the terminal device needs to perform uplink synchronization first when there is an uplink transmission requirement.

S202. The base station instructs the terminal device to enter a light connection state.

Specifically, the terminal device may receive control information that is sent by the base station to enter a light connection state, so that the RRC connected state enters a light connection state.

It should be noted that the timing between steps S202 and S201 is not specifically limited in this embodiment. For example, the base station may indicate whether the uplink synchronization needs to be performed before the uplink transmission when the terminal device is in the light connection state before the terminal device enters the light connection state. The base station may also indicate, when the terminal device is in the light connection state, whether the terminal device needs to perform uplink synchronization before the uplink transmission. The base station may further indicate, after the terminal device enters the light connection state, whether the terminal device needs to perform uplink synchronization before uplink transmission.

S203. When the base station needs to send to the terminal device in a light connection state, When the data is transmitted, the base station sends scheduling information to the terminal device.

The scheduling information carries an identifier that is allocated by the base station to the terminal device, and the identifier is used by the terminal device to identify the scheduling information.

It should be noted that the identifier is used by the base station to schedule the terminal device. The role of the identifier is not the same as the connection recovery identifier assigned by the base station to the terminal device in a light connection state.

The scheduling information may include indication information of the downlink resource allocated by the base station to downlink data that needs to be sent to the terminal device. The scheduling information may further include indication information of a coding and modulation manner of the downlink data.

Optionally, the identifier is an identifier that is sent by the base station to the terminal device when the terminal device establishes an RRC connection with the base station. That is, after the terminal device enters the light connection state, the base station continues to use the identifier allocated by the base station to the terminal device when the terminal device is in the RRC connected state to schedule the terminal device.

The identifier may also be an identifier that is re-allocated by the base station to the terminal device when the terminal device is instructed to enter the light connection state.

The identifier uniquely identifies the terminal device in a resource configuration area. The identifier can be an independent continuous string. The base station allocates a unique identifier to each terminal device in the resource configuration area.

The identifier may be a Radio Network Tempory Identity (RNTI), such as a Cell Radio Network Temporary Identity (Cell RNTI, C-RNTI).

The identifier may also include a group identifier and a terminal device identifier. The group identifier is used in A terminal device group in which the terminal device is located is uniquely identified in the resource configuration area. The terminal device identifier is used to uniquely identify the terminal device within the group. In this way, the base station can schedule a terminal device group by using the group identifier, which effectively saves network resources.

Optionally, the base station includes the identifier included in the scheduling information and sent to the terminal device.

Optionally, the base station uses the identifier to scramble a physical downlink control channel (PDCCH) that sends the scheduling information.

When the identifier is composed of a group identifier and a terminal device identifier, the base station may use the group identifier to scramble a PDCCH that sends the scheduling information, and carry the terminal device identifier in protocol data of the scheduling information. In the Protocol Data Unit (PDU).

By scrambling the PDCCH by using the identifier, the length of the scheduling information can be shortened, and the network transmission resource can be saved.

It should be noted that, after the terminal device enters the light connection state, the timing of the step S201 and the step S203 is not specifically limited in this embodiment.

Optionally, the base station, before sending the scheduling information to the terminal device, indicates whether the terminal device needs to perform uplink synchronization first when there is an uplink transmission requirement. The base station may indicate the terminal device only before transmitting the first scheduling information. The base station may also indicate the terminal device before sending the scheduling information each time.

The base station may also indicate, after sending the scheduling information to the terminal device, whether the terminal device needs to perform uplink synchronization first when there is an uplink transmission requirement.

S204. The base station sends the downlink data to the terminal device by using the resource indicated by the scheduling information.

S205. The terminal device receives downlink data sent by the base station by using the resource indicated by the scheduling information, and sends feedback information to the base station when in an uplink synchronization state. The feedback information reflects the receiving condition of the downlink data by the terminal device.

Optionally, the terminal device decodes the scheduling information. And if the scheduling information includes the identifier that is allocated by the base station to the terminal device, the terminal device receives the downlink data on a resource indicated by the scheduling information. The terminal device demodulates and decodes the downlink data by using a coding and modulation manner of the downlink data indicated by the scheduling information.

Optionally, the terminal device uses the identifier to descramble the PDCCH to obtain the scheduling information. The terminal device receives the downlink data on the resource indicated by the scheduling information, and demodulates and decodes the downlink data by using a coding and modulation manner of the downlink data indicated by the scheduling information.

When the identifier is composed of the group identifier and the terminal device identifier, the terminal device may use the group identifier to descramble the PDCCH, so as to determine that the base station schedules the terminal device group where the terminal device is located. The terminal device decodes the scheduling information. If the terminal device obtains the terminal device identifier in the PDU of the scheduling information, the terminal device further acquires a resource for receiving downlink data and a coding and modulation manner of the downlink data.

The terminal device receives the downlink number by using the scheduling information sent by the base station. According to the process, the terminal device does not need to resume the RRC connection in the process, but can remain in the light connection state.

After demodulating and decoding the downlink data, the terminal device determines whether to perform uplink synchronization before transmitting the feedback information.

Optionally, the terminal device determines that it is in an uplink synchronization state. Alternatively, the terminal device determines that uplink synchronization need not be performed before transmitting the feedback information. At this time, the terminal device may send the feedback information on a Physical Uplink Control Channel (PUCCH).

Optionally, the terminal device determines that it is in an uplink out-of-synchronization state. Alternatively, the terminal device determines that uplink synchronization needs to be performed before transmitting the feedback information. At this time, the terminal device sends feedback information after performing uplink synchronization through a random access procedure. The process specifically includes:

SS21: The terminal device sends a preamble code to the base station.

The base station receives the preamble code sent by the terminal device, and sends a random access response (RAR) to the terminal device, where the RAR includes the base station that is allocated by the base station to the terminal device. Upstream resources.

Through the above steps, the terminal device completes uplink synchronization. Thereafter, the terminal device sends the feedback information to the base station by using an uplink resource allocated by the base station in the RAR.

Optionally, the feedback information includes Hybrid Automatic Repeat reQuest (HARQ) feedback information. The HARQ feedback information includes positive feedback (ACK) or negative feedback (Negative) ACKnowledgement, NACK).

The feedback information may further include a connection recovery identifier of the terminal device. The connection recovery identifier is used to enable the base station to determine which terminal device the feedback information is from.

According to the data transmission method provided by the embodiment of the present invention, after the terminal device enters the light connection state under the indication of the base station, the paging from the base station is no longer monitored, but the base station performs scheduling. When the base station needs to send downlink data to the terminal device, the base station sends scheduling information to the terminal device, where the terminal device receives the downlink data on the resource indicated by the scheduling information, and according to the base station An indication of whether to perform uplink synchronization transmits feedback information to the base station. Thereby, the terminal device in the light connection state can receive the downlink data in time, thereby improving the efficiency of data transmission.

FIG. 3 is a schematic diagram of a data transmission method according to another embodiment of the present invention. The method provided in this embodiment will be described in detail from the perspective of interaction with FIG. 3 below.

S301. The base station allocates and sends an identifier to a terminal device that moves to a serving cell of the base station. The terminal device is in a light connection state.

Specifically, the terminal device enters a light connection state in a serving cell of the source base station under the instruction of the source base station, and performs mobility based on cell reselection. Thereafter, the terminal device moves to a serving cell of the base station. The base station is a target base station, and the terminal device resides in a serving cell of the target base station. The serving cell of the source base station and the serving cell of the target base station belong to different resource configuration areas. For example, as shown in FIG. 1, terminal device 20 is moved from cell A to cell B.

After the terminal device moves to the serving cell of the target base station, the location update is triggered by a random access procedure. The location update is performed by the resource in the terminal device Triggered when the zone is moved to another resource configuration zone. In this embodiment, the terminal device triggers a location update when moving from a serving cell of the source base station to a serving cell of the target base station. In the location update process, the target base station allocates the identifier to the terminal device. The identifier is different from the identifier allocated by the source base station to the terminal device. The triggering the location update by the random access procedure specifically includes:

SS31: The base station receives a preamble code sent by the terminal device.

SS32. The base station receives a preamble code sent by the terminal device, and sends an RAR to the terminal device.

The RAR includes the identifier that is allocated by the base station to the terminal device. Thereafter, when the base station has a downlink data transmission requirement, the base station uses the identifier to schedule the terminal device.

The RAR may further include an uplink resource allocated by the base station to the terminal device. The terminal device may further send a connection recovery identifier and a location update identifier to the base station by using the uplink resource. The connection recovery identifier is used to enable the base station to determine which terminal device moves to the serving cell of the base station. The location update identifier has an indication function for reporting, to the base station, that a resource configuration area where the terminal device is located changes.

Through the foregoing process, the terminal device accesses the cell served by the base station in time and obtains the identifier allocated by the base station, so that the terminal device can be scheduled in time when the base station has downlink data transmission.

S302. The base station indicates whether the terminal device in a light connection state needs to perform uplink synchronization.

Optionally, after moving to the serving cell of the base station, the terminal device in the light connection state receives a broadcast message in the cell, so as to determine whether uplink synchronization needs to be performed first when there is an uplink data transmission request.

Optionally, after the terminal device moves to the serving cell of the base station, the cell served by the base station and the cell served by the source base station belong to different resource configuration areas, and the base station needs to be the terminal device. Reconfigure the parameters. The base station may indicate, when the parameter is reconfigured for the terminal device, whether the terminal device needs to perform uplink synchronization first when there is an uplink data transmission request.

S303. When the base station needs to send downlink data to a terminal device in a light connection state, the base station sends scheduling information to the terminal device.

It should be noted that, in this embodiment, the timing relationship between steps S302 and S303 is the same as the timing relationship between step S201 and step S203, and details are not described herein again.

S304. The base station sends the downlink data to the terminal device by using the resource indicated by the scheduling information.

S305. The terminal device receives downlink data sent by the base station by using the resource indicated by the scheduling information, and sends feedback information to the base station when in an uplink synchronization state. The feedback information reflects the receiving condition of the downlink data by the terminal device. Therefore, the terminal device receives the downlink data by using the scheduling information sent by the base station, and the terminal device does not need to resume the RRC connection in the process, but may remain in the light connection state.

In the same manner as step S205, after demodulating and decoding the downlink data, the terminal device determines whether uplink synchronization needs to be performed before transmitting the feedback information. The specific process is as shown in step S205, and will not be described in detail here.

According to the data transmission method provided by the embodiment of the present invention, the terminal device in the light connection state, after moving to the serving cell of the base station, listens to the scheduling from the base station, and receives the downlink according to the scheduling information of the base station. Data, and transmitting feedback information to the base station according to the indication of whether the base station performs uplink synchronization. Thereby, the terminal device in the light connection state can receive the downlink data in time, thereby improving the efficiency of data transmission.

The scheduling method provided by the embodiment of the present invention is mainly introduced from the perspective of interaction between the network elements. It can be understood that each network element, such as a terminal device, a base station, etc., in order to implement the above functions, includes hardware structures and/or software modules corresponding to each function. Those skilled in the art will readily appreciate that the present invention can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

FIG. 4 shows a possible structural diagram of a base station involved in the above embodiment. The base station may be the

base stations

10, 11 as shown in FIG. The base station includes a processing unit 401, a transmitting unit 402, and a receiving unit 403.

The processing unit 401 is configured to indicate whether the terminal device in the light connection state needs to be To perform uplink synchronization.

The sending unit 402 is configured to send scheduling information to the terminal device when the downlink data needs to be sent to the terminal device in the light connection state. The scheduling information carries an identifier that is allocated by the processing unit to the terminal device. The identifier is used by the terminal device to identify the scheduling information.

The sending unit 402 is further configured to send the downlink data to the terminal device by using the resource indicated by the scheduling information.

The receiving unit 403 is configured to receive feedback information sent by the terminal device in an uplink synchronization state. The feedback information reflects the reception status of the downlink data.

Optionally, the sending unit 403 is further configured to send a broadcast message under the control of the processing unit 401. The terminal device determines, by using the broadcast message, whether uplink synchronization is performed first when uplink transmission is required.

Optionally, the processing unit 401 is further configured to: according to a pre-arrangement with the terminal device, instruct the terminal device to perform uplink synchronization first when uplink transmission is required. For example, the processing unit 401, when configuring parameters for the terminal device, indicates whether the terminal device needs to perform uplink synchronization first when there is an uplink transmission requirement.

The sending unit 402 is further configured to send, to the terminal device, control information that indicates that the terminal device enters a light connection state.

Optionally, the processing unit 401 is further configured to allocate, by the terminal device that moves to the serving cell of the base station, an identifier for identifying scheduling information. The specific form of the identifier is as described in step S203, and will not be described in detail herein.

The processing unit 401 is further configured to carry the identifier in the scheduling information. Or using the identifier to scramble the PDCCH that sends the scheduling information.

When the identifier is composed of the group identifier and the terminal device identifier, the processing unit 401 may be further configured to scramble the PDCCH that sends the scheduling information by using the group identifier, and carry the terminal device identifier in the Scheduling information in the PDU.

Optionally, if the terminal device is in an uplink synchronization state, or the processing unit 401 indicates that the terminal device does not need to perform uplink synchronization before sending the feedback information, the sending unit 402 is further configured to receive the terminal device. The feedback information sent on the physical uplink control channel.

If the terminal device is in the uplink out-of-synchronization state, or the processing unit 401 indicates that the terminal device needs to perform uplink synchronization before sending the feedback information, the receiving unit 403 is further configured to receive the preamble sent by the terminal device. code. The sending unit 402 is further configured to send an RAR to the terminal device, where the RAR includes an uplink resource allocated by the base station to the terminal device. The receiving unit 403 is configured to receive the feedback information that is sent by the terminal device by using the uplink resource.

The feedback information may include content as described in step S205 of the method shown in FIG. 2, and details are not described herein again.

Optionally, the processing unit 401 is further configured to allocate the identifier to the terminal device when the terminal device moves to a serving cell of the base station. Specifically, the receiving unit 403 is further configured to receive a preamble code sent by the terminal device. The sending unit 402 is further configured to send an RAR to the terminal device, where the RAR includes the identifier. The RAR may further include an uplink resource allocated by the processing unit 401 to the terminal device. The receiving unit 403 is further configured to receive, by the terminal device, the The connection recovery identifier and the zone update identifier sent by the row resource.

Other achievable functions that are not described in the above units are the same as those of the base stations involved in the data transmission method shown in FIGS. 2 and 3, and will not be described in detail herein. Through the cooperation between the above units, the terminal device in the light connection state can complete the downlink data reception in time, thereby improving the efficiency of data transmission.

The functions of the units in the base station described above may be implemented by hardware or by executing corresponding software by hardware. For example, each of the above units may be hardware having a function of executing each module, or may be another hardware device capable of executing a corresponding computer program to perform the above functions.

FIG. 5 shows a possible structural diagram of a base station involved in the above embodiment. The base station includes a processor 501, a transmitter 502, and a receiver 503. The processing unit 401 described in FIG. 4 can be implemented by the processor 501, the sending unit 402 can be implemented by the transmitter 502, the receiving unit 403 can be implemented by the receiver 503, and the transmitter 502 and the receiver 503 can be used to support the base station. Data is transmitted and received with the terminal device in the above embodiment. The base station can also include a memory 504 that can be used to store program codes and data for the base station. The various components in the base station are coupled together to support the functions of the base station in the scheduling method as described in Figures 2 and 3.

It will be appreciated that Figure 5 only shows a simplified design of the base station. In practical applications, the base station may include any number of transmitters, receivers, processors, memories, etc., and all base stations that can implement the present invention are within the scope of the present invention.

FIG. 6 is a schematic diagram showing a possible structure of a terminal device involved in the above embodiment. The terminal device may be the terminal device 20 as shown in FIG. 1. The terminal The device includes a processing unit 601, a receiving unit 602, and a transmitting unit 603.

The processing unit 601 is configured to determine, according to an indication of the base station, whether uplink synchronization needs to be performed in a light connection state, and perform corresponding processing.

The receiving unit 602 is configured to receive scheduling information sent by the base station. The scheduling information carries an identifier that is allocated by the base station to the terminal device. The identifier is used by the terminal device to identify the scheduling information.

The receiving unit 602 is further configured to receive downlink data sent by the base station by using the resource indicated by the scheduling information.

The sending unit 603 is configured to send feedback information to the base station when the terminal device is in an uplink synchronization state. The feedback information reflects the reception status of the downlink data.

The specific form of the identifier may be as described in step S203 in the method shown in FIG. 2, and is not specifically described herein.

Optionally, the processing unit 601 is further configured to control, by the indication of the base station, the terminal device to enter a light connection state.

The terminal device acquires the identifier allocated by the base station when moving to a serving cell of the base station. Specifically, the sending unit 603 is further configured to send a preamble code to the base station after the terminal device moves to a serving cell of the base station. The receiving unit 602 is further configured to receive the RAR sent by the base station, where the RAR includes the identifier that is allocated by the base station to the terminal device.

The RAR may further include an uplink resource allocated by the base station to the terminal device. The sending unit 603 is further configured to send, by using the uplink resource, the base station The connection recovery identifier and the area update identifier of the terminal device.

Optionally, the processing unit 601 is further configured to determine, by using a broadcast message received by the receiving unit 602, or a pre-agreed with the base station, whether the terminal device entering the light connection state needs to perform uplink synchronization.

Optionally, the processing unit 601 is further configured to decode the scheduling information, so as to obtain the identifier. Alternatively, the processing unit is configured to descramble the PDCCH by using the identifier, so as to obtain the scheduling information.

When the identifier is composed of the group identifier and the terminal device identifier, the processing unit 601 is further configured to descramble the PDCCH by using the group identifier, so as to determine that the base station schedules the terminal device group where the terminal device is located. The processing unit 601 is further configured to further decode the scheduling information, and determine whether the terminal device identifier is included in the scheduling information.

Optionally, if the processing unit 601 determines that the terminal device is in an uplink synchronization state, or does not need to perform uplink synchronization first, the sending unit 603 is further configured to send the feedback information by using a physical uplink control channel.

If the processing unit 601 determines that the terminal device is in an uplink out-of-synchronization state, or needs to perform uplink synchronization first, the sending unit 603 is further configured to send a preamble code to the base station. The receiving unit 602 is further configured to receive an RAR sent by the base station, where the RAR includes an uplink resource allocated by the base station to the terminal device. The sending unit 601 is further configured to send the feedback information by using the uplink resource.

Other achievable functions that are not described in the above units are the same as those of the terminal devices involved in the data transmission method shown in FIG. 2 and FIG. 3, and will not be described in detail herein. Through the cooperation between the above units, the terminal device in the light connection state can complete the downlink data reception in time, thereby improving the efficiency of data transmission.

The functions of the units in the terminal device described above may be implemented by hardware or by executing corresponding software by hardware. For example, each of the above units may be hardware having a function of executing each module, or may be another hardware device capable of executing a corresponding computer program to perform the above functions.

FIG. 7 is a schematic diagram showing a possible structure of a terminal device involved in the above embodiment. The terminal device includes a processor 701, a receiver 702, and a transmitter 703. The processing unit 601 depicted in FIG. 6 may be implemented by the processor 701. The receiving unit 602 can be implemented by the receiver 702, and the sending unit 703 can be implemented by the transmitter 703. The receiver 702 and the transmitter 703 can be used to support data transmission and reception between the terminal device and the base station in the foregoing embodiment. The processing unit 601 can be implemented by the processor 701. The terminal device may further include a memory 704, which may be used to store program codes and data of the terminal device. The various components in the terminal device are coupled together to support the functions of the terminal device in the scheduling method involved in the embodiments as described in FIGS. 2 and 3.

It will be understood that Figure 7 only shows a simplified design of the terminal device. In practical applications, the terminal device may include any number of transmitters, receivers, processors, memories, etc., and all terminal devices that can implement the present invention are within the scope of the present invention.

It can be understood that the processor in the embodiment of the present invention may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or the like. Programming logic devices, transistor logic devices, hardware components, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.

The steps of the method or algorithm described in the embodiments of the present invention may be directly embedded in hardware, a software module executed by a processing unit, or a combination of the two. The software modules can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art. Illustratively, the storage medium can be coupled to the processing unit such that the processing unit can decode information from the storage medium and can write information to the storage medium. Alternatively, the storage medium can also be integrated into the processing unit. The processing unit and the storage medium may be configured in an ASIC, and the ASIC may be configured in the user terminal device. Alternatively, the processing unit and the storage medium may also be configured in different components in the user terminal device.

Those skilled in the art should appreciate that in the above one or more examples, the above described functions described in the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on a computer readable medium or transmitted on a computer readable medium in one or more instructions or code. Computer readable media includes computer storage media and communication media that facilitates transfer of a computer program from one place to another. The storage medium can be any general or special The computer can access the available media for access. For example, such computer readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage device, or any other device or data structure that can be used for carrying or storing Other media that can be decoded by a general purpose/special computer, or general purpose/special processing unit. In addition, any connection can be appropriately defined as a computer readable medium, for example, if the software is from a website site, server, or other remote resource through a coaxial cable, fiber optic computer, twisted pair, digital subscriber line (DSL) Or wirelessly transmitted in, for example, infrared, wireless, and microwave, is also included in the computer readable medium as defined. The disks and discs include compact disks, laser disks, optical disks, DVDs, floppy disks, and Blu-ray disks. Disks typically replicate data magnetically, while disks typically optically replicate data with a laser. Combinations of the above may also be included in a computer readable medium.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. The scope of the protection, any modifications, equivalent substitutions, improvements, etc., which are made on the basis of the technical solutions of the present invention, are included in the scope of the present invention.

Claims

A data transmission method, comprising:

Determining, by the base station, whether the terminal device in the light connection state needs to perform uplink synchronization;

When the base station needs to send downlink data to the terminal device in the light connection state, the base station sends scheduling information to the terminal device, where the scheduling information carries the identifier allocated by the base station to the terminal device The identifier is used by the terminal device to identify the scheduling information;

Transmitting, by the base station, the downlink data to the terminal device by using the resource indicated by the scheduling information;

The base station receives feedback information sent by the terminal device in an uplink synchronization state, where the feedback information reflects a reception status of the downlink data.
The method according to claim 1, wherein before the base station sends the scheduling information to the terminal device, the method further includes:

The base station instructs the terminal device to enter a light connection state.
The method according to claim 1, wherein before the base station sends the scheduling information to the terminal device, the method further includes:

Receiving, by the base station, a preamble sequence code sent by the terminal device that is moved to a serving cell of the base station;

The base station sends a random access response to the terminal device, where the random access response includes the identifier allocated by the base station to the terminal device.
The method according to any one of claims 1 to 3, wherein the base station indicates whether the terminal device needs a broadcast message or a pre-arrangement with the terminal device Perform uplink synchronization.
The method according to any one of claims 1-4, wherein the identifier comprises a group identifier and a terminal device identifier, wherein the group identifier is used to uniquely identify a terminal device group in which the terminal device is located, And the terminal device identifier is used to uniquely identify the terminal device within the group.
The method of claim 5, wherein the scheduling information carrying the identifier allocated by the base station to the terminal device comprises:

The base station uses the group identifier to scramble the physical downlink control channel that sends the scheduling information, where the scheduling information includes the terminal device identifier.
The method according to any one of claims 1-6, wherein if the base station indicates that the terminal device needs to perform uplink synchronization, the base station receives the terminal device that is in an uplink synchronization state and sends the method. Before feedback, it also includes:

Receiving, by the base station, a preamble sequence code sent by the terminal device;

The base station sends a random access response to the terminal device, where the random access response includes an uplink resource allocated by the base station to the terminal device;

The feedback information is transmitted by the terminal device by using the uplink resource.
A data transmission method, comprising:

Determining, according to the indication of the base station, whether the uplink synchronization needs to be performed in the light connection state, and performing corresponding processing;

The terminal device in a light connection state receives scheduling information sent by the base station, where the scheduling information carries an identifier allocated by the base station to the terminal device, and the identifier is used by the terminal device to identify the scheduling Information

Receiving, by the terminal device, the downlink data sent by the base station by using the resource indicated by the scheduling information;

The terminal device in an uplink synchronization state sends feedback information to the base station, where the feedback information reflects a reception status of the downlink data.
The method according to claim 8, wherein before the receiving, by the terminal device, the scheduling information sent by the base station, the method further includes:

The terminal device enters a light connection state under the instruction of the base station.
The method according to claim 8, wherein before the terminal device in the light connection state receives the scheduling information sent by the base station, the method further includes:

Transmitting, by the terminal device, a preamble sequence code to the base station after moving to a serving cell of the base station;

Receiving, by the terminal device, a random access response sent by the base station, where the random access response includes the identifier allocated by the base station to the terminal device.
The method according to any one of claims 8 to 10, wherein the terminal device determines whether uplink synchronization needs to be performed in a light connection state by receiving a broadcast message or a pre-agreed with the base station.
The method according to any one of claims 8 to 11, wherein the identifier includes a group identifier and a terminal device identifier, wherein the group identifier is used to uniquely identify a terminal device group in which the terminal device is located, And the terminal device identifier is used to uniquely identify the terminal device within the group.
The method according to claim 12, wherein the receiving, by the terminal device in the light connection state, the scheduling information sent by the base station comprises:

Determining, by the terminal device, the physical downlink channel that sends the scheduling information by using the group identifier;

The terminal device decodes the scheduling information, where the scheduling information includes the terminal device identifier.
The method according to any one of claims 8 to 13, wherein if the terminal device determines that uplink synchronization needs to be performed, performing corresponding processing includes:

Before the terminal device in the uplink synchronization state sends feedback information to the base station, the terminal device sends a preamble sequence code to the base station;

Receiving, by the terminal device, a random access response sent by the base station, where the random access response includes an uplink resource allocated by the base station to the terminal device;

The feedback information is transmitted by the terminal device by using the uplink resource.
A base station, comprising:

a processing unit, configured to indicate whether the terminal device in the light connection state needs to perform uplink synchronization;

a sending unit, configured to send scheduling information to the terminal device when the downlink data needs to be sent to the terminal device in the light connection state, where the scheduling information carries an identifier that is allocated by the processing unit to the terminal device The identifier is used by the terminal device to identify the scheduling information;

The sending unit is further configured to send the downlink data to the terminal device by using the resource indicated by the scheduling information;

The receiving unit is configured to receive feedback information sent by the terminal device in an uplink synchronization state, where the feedback information reflects a receiving situation of the downlink data.
The base station according to claim 15, wherein before the sending unit is configured to send the scheduling information to the terminal device, the method further includes:

The sending unit is further configured to send control information to the terminal device, where the control information indicates that the terminal device enters a light connection state.
The base station according to claim 15, wherein before the sending unit is configured to send the scheduling information to the terminal device, the method further includes:

The receiving unit is further configured to receive a preamble sequence code sent by the terminal device that is moved to a serving cell of the base station;

The sending unit is further configured to send a random access response to the terminal device, where the random access response includes the identifier allocated by the processing unit to the terminal device.
The base station according to any one of claims 15 to 17, wherein the processing unit transmits a broadcast message to the terminal device by controlling the transmitting unit or the processing unit passes the advance with the terminal device The appointment indicates whether the terminal device needs to perform uplink synchronization.
The base station according to any one of claims 15 to 18, wherein the identifier includes a group identifier and a terminal device identifier, wherein the group identifier is used to uniquely identify a terminal device group in which the terminal device is located, The terminal device identifier is used to uniquely identify the terminal device within the group.
The base station according to claim 19, wherein the scheduling information carrying the identifier allocated by the processing unit to the terminal device comprises:

The processing unit uses the group identifier to scramble the physical downlink control channel that sends the scheduling information, and includes the terminal device identifier in the scheduling information.
The base station according to any one of claims 15 to 20, wherein if the processing unit instructs the terminal device to perform uplink synchronization, the receiving unit is configured to receive the terminal device in an uplink synchronization state. Before sending feedback, it also includes:

The receiving unit is further configured to receive a preamble sequence code sent by the terminal device;

The sending unit is further configured to send a random access response to the terminal device, where the random access response includes an uplink resource allocated by the processing unit to the terminal device, where the feedback information is The terminal device transmits through the uplink resource.
A terminal device, comprising:

a processing unit, configured to determine, according to an indication of the base station, whether the terminal device entering the light connection state needs to perform uplink synchronization, and perform corresponding processing;

a receiving unit, configured to receive scheduling information sent by the base station, where the scheduling information carries an identifier that is allocated by the base station to the terminal device, where the identifier is used by the terminal device to identify the scheduling information;

The receiving unit is further configured to receive, by using the resource indicated by the scheduling information, downlink data sent by the base station;

And a sending unit, configured to send feedback information to the base station when the terminal device is in an uplink synchronization state, where the feedback information reflects a receiving situation of the downlink data.
The terminal device according to claim 22, wherein before the receiving unit is configured to receive the scheduling information sent by the base station, the method further includes:

The processing unit controls the terminal device to enter a light connection state under the instruction of the base station.
A terminal device according to claim 22, characterized by being used in a receiving unit Before receiving the scheduling information sent by the base station, the method further includes:

The sending unit is further configured to: after the terminal device moves to a serving cell of the base station, send a preamble sequence code to the base station;

The receiving unit is further configured to receive a random access response sent by the base station, where the random access response includes the identifier allocated by the base station to the terminal device.
The terminal device according to claim 22-24, wherein the processing unit determines whether the terminal device entering the light connection state needs to perform uplink synchronization by using a broadcast message received by the receiving unit or a pre-agreed with the base station .
The terminal device according to any one of claims 22 to 25, wherein the identifier includes a group identifier and a terminal device identifier, wherein the group identifier is used to uniquely identify a terminal device group in which the terminal device is located. The terminal device identifier is used to uniquely identify the terminal device within the group.
The terminal device according to claim 26, wherein the receiving unit is configured to receive scheduling information sent by the base station, including:

The processing unit is further configured to use the group identifier to perform descrambling on a physical downlink channel that sends the scheduling information.

The processing unit is further configured to decode the scheduling information, where the scheduling information includes the terminal device identifier.
The terminal device according to any one of claims 22 to 27, wherein if the processing unit determines that uplink synchronization needs to be performed, performing corresponding processing includes:

The sending unit is further configured to send a preamble sequence code to the base station, before sending, by the sending unit, the feedback information to the base station, when the terminal device is in an uplink synchronization state;

The receiving unit is further configured to receive a random access response sent by the base station, where the random access response includes an uplink resource allocated by the base station to the terminal device;

The feedback information is transmitted by the sending unit by using the uplink resource.