WO2018112922A1

WO2018112922A1 - Data transmission method and device

Info

Publication number: WO2018112922A1
Application number: PCT/CN2016/111822
Authority: WO
Inventors: 陈冬明; 吴环宇; 陈雍珏
Original assignee: 华为技术有限公司
Priority date: 2016-12-23
Filing date: 2016-12-23
Publication date: 2018-06-28
Also published as: CN110100494B; CN110100494A

Abstract

A data transmission method and device, for use in resolving the problems of discontinuous UE scheduling, restricted UE scheduling rate, increased UE scheduling duration, and increased loss of UE power due to insufficient HARQ processes. When data transmission is performed between a base station and a terminal, the base station determines whether a preset amount of hybrid auto repeat request (HARQ) processes are occupied; if the preset amount of HARQ processes are occupied, the base station selects a first HARQ process from the preset amount of HARQ processes; perform data transmission between the base station and the terminal using the first HARQ process.

Description

Method and device for data transmission

Technical field

Embodiments of the present invention relate to the field of wireless communication technologies, and in particular, to a data transmission method and device for machine type communication.

Background technique

Machine to Machine (M2M) is a common application form in the Internet of Things (IOT). The 3rd Generation Partnership Project (3GPP) introduced Machine Type Communications (MTC) technology and Enhanced evolved Machine Type Communications (eMTC) technology.

In the prior art, the user equipment (UE) of the eMTC is divided into two coverage modes: mode A (Mode A) and mode B (Mode B).

In ModeA, eMTC supports up to eight Hybrid Auto Repeat Request (HARQ) processes.

In the following example, in the nth subframe, the evolved Node B (eNB) transmits Downlink Control Information (DCI) by using the MTC Physical Downlink Control Channel (MPDCCH). The eNB transmits data to the UE by using a Physical Downlink Shared Channel (PDSCH) in the n+kth subframe, where k≥2. In the n+k+4th subframe, the UE transmits a feedback acknowledgement (ACK)/negative acknowledgement (NACK) of the data by using a Physical Uplink Control CHannel (PUCCH). From the transmission of ACK/NACK through the PUCCH to the eNB for demodulation and processing, approximately three Transmission Time Intervals (TTIs) are required. Therefore, the maximum number of supported HARQ processes cannot fill the gap of a HARQ process.

For example, the eNB sends DCI to the UE through the MPDCCH in the n=0 subframe, and the n=2 subframe The eNB transmits data to the UE through the PDSCH. The UE decoding fails. In the n=6 subframe, the UE sends the NACK information of the data to the eNB through the PUCCH. The eNB performs demodulation and processing according to the NACK information. The eNB schedules the retransmission data according to the downlink resource allocation situation. As shown in Figure 1, the round trip time of a HARQ process requires at least 10 TTIs. The eMTC HARQ adopts a multi-process "stop-and-wait" HARQ implementation mode. That is, for any HARQ process, the process temporarily suspends transmission before waiting for ACK/NACK feedback. When receiving feedback, it is based on whether the feedback is ACK or NACK. Choose whether to send new data or retransmit. During this time, the eNB/UE can of course not stop transmitting and wait in vain, and other parallel HARQ processes must be initiated to make full use of the time domain resources. As shown in Figure 2, the number of processes in parallel HARQ is related to the round-trip time of a HARQ process, that is, the transmission delay is related to the processing time of the UE/eNB. The round-trip time of the HARQ process is larger, and it needs to be supported to fill the HARQ process. The more the number of parallel HARQ processes in the round-trip time, the number of parallel HARQ processes needs to be equal to the round-trip time TTI of the HARQ process, but the 3GPP protocol stipulates that under modeA, the eMTC supports a maximum of eight HARQ processes, and the number of eight HARQ processes cannot fill the HARQ. The round trip time of the process, there is a problem of insufficient number of processes.

In ModeB, the eMTC supports a maximum of two HARQ processes, and there is also a problem that the number of processes described above is insufficient.

Since the HARQ process is not used enough, the UE scheduling is discontinuous, and the UE scheduling rate is limited.

Summary of the invention

The embodiment of the invention provides a method and a device for data transmission, which can improve the scheduling rate of the UE.

A first aspect, a data transmission method, the method includes: when a base station performs data transmission with a terminal, the base station determines whether a preset number of hybrid automatic repeat request HARQ processes are occupied; if the base station determines When the preset number of HARQ processes are occupied, the base station selects, from the preset number of HARQ processes, the HARQ process that has the longest time interval from the most recent use as the first HARQ process; The base station performs the data transmission with the terminal by using the first HARQ process.

In the embodiment of the present invention, the base station selects the occupied HARQ for multiplexing, that is, when any HARQ process performs data transmission with any terminal, it can also be used for data transmission with other terminals to implement UE scheduling. Continuity to improve UE scheduling rate. Further, by multiplexing the HARQ process, the UE scheduling duration is reduced, and the UE power loss is reduced.

In a possible design, the base station performs the data transmission with the terminal by using the first HARQ process, including: according to the first HARQ process, the base station sends a physical downlink shared channel to the terminal Transmitting a data block; the base station receiving the HARQ feedback information sent by the terminal, where the HARQ feedback information indicates a receiving status of the data block; if the HARQ feedback information is an acknowledgement ACK or the first HARQ process reaches a pre- The maximum number of retransmissions is set, and the base station clears the data block.

In the embodiment of the present invention, if the HARQ feedback information is an acknowledgement ACK or the first HARQ process reaches a preset maximum number of retransmissions, the base station clears the data block corresponding to the first HARQ process, and uses the first A HARQ process transmits a new data block, and clearing the data block ensures that the first HARQ process is a process that can be used again for data transmission.

In a possible design, the base station performs the data transmission with the terminal by using the first HARQ process, according to the first HARQ process, that: the base station sends the data to the terminal through a downlink physical shared channel. Transmitting a data block; the base station receiving the HARQ feedback information sent by the terminal, the HARQ feedback information indicating a receiving status of the data block; and if the HARQ feedback information is a negative acknowledgement NACK, the base station determining the predetermined quantity Whether there is an idle second HARQ process in the HARQ process, and if there is an idle second HARQ process, the data block is retransmitted using the second HARQ process. The second HARQ process may select any idle HARQ process in a preset number of HARQ processes.

In a possible design, the method further includes: if there is no idle second HARQ process, the base station selects a third HARQ that is the longest time interval from the last use in the predetermined number of HARQ processes. The process retransmits the data block. The third HARQ process is the same as or different from the first HARQ process.

In a possible design, based on the first HARQ process, the base station utilizes the And performing, by the HARQ process, the data transmission by the terminal, where the base station receives the data block sent by the terminal by using a physical uplink shared channel; if the base station correctly receives the data block sent by the terminal or the The first HARQ process reaches a preset maximum number of retransmissions, and the base station clears the buffer of the first HARQ process.

In a possible design, based on the first HARQ process, the base station performs the data transmission with the terminal by using the first HARQ process, including: the base station receiving the terminal by using a physical uplink shared channel. Transmitting a data block; if the base station cannot correctly receive the data block sent by the terminal, the base station determines whether there is an idle second HARQ process in the predetermined number of HARQ processes, if there is any idle a second HARQ process, the base station instructing the terminal to retransmit the data block using the second HARQ process.

In a possible design, the method further includes: if there is no idle second HARQ process, the base station selects a third HARQ process in the predetermined number of HARQ processes, and instructs the terminal to use the The third HARQ process retransmits the data block.

In a second aspect, the base station includes: a determining module, configured to determine whether a preset number of hybrid automatic repeat request HARQ processes are occupied when the base station and the terminal to which the determining module belongs perform data transmission a selection module, if the preset number of HARQ processes are occupied, for selecting a first HARQ process from the preset number of HARQ processes; and a processing module, configured to utilize the first HARQ process and the The terminal performs the data transmission.

In the embodiment of the present invention, the base station selects the occupied HARQ for multiplexing, that is, when any HARQ process performs data transmission with any terminal, it can also be used for data transmission with other terminals to implement UE scheduling. Continuity, improve UE scheduling rate, reduce UE scheduling duration, and reduce UE power loss.

In a possible design, the processing module is specifically configured to: send, according to the first HARQ process, a data block to the terminal by using a physical downlink shared channel; and receive HARQ feedback information sent by the terminal, the HARQ The feedback information indicates a receiving status of the data block; if the HARQ feedback information is an acknowledgement ACK or the first HARQ process reaches a preset maximum number of retransmissions, the data block is cleared.

In a possible design, the processing module is specifically configured to: send, according to the first HARQ process, a data block to the terminal by using a downlink physical shared channel; and receive HARQ feedback information sent by the terminal, the HARQ The feedback information indicates a receiving state of the data block; if the HARQ feedback information is a negative acknowledgment NACK, determining whether there is an idle second HARQ process in the predetermined number of HARQ processes, if there is an idle second HARQ process Retransmitting the data block using the second HARQ process.

In a possible design, the processing module is further configured to: if there is no idle second HARQ process, select a third HARQ process to retransmit the data block in the predetermined number of HARQ processes.

In a possible design, the processing module is specifically configured to: receive, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel; if the base station correctly receives the location sent by the terminal The data block or the first HARQ process reaches a preset maximum number of retransmissions, and the buffer of the first HARQ process is cleared.

In a possible design, the processing module is specifically configured to: receive, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel; if the base station cannot correctly receive the sent by the terminal Determining, by the data block, whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, instructing the terminal to retransmit the data by using the second HARQ process Piece.

In a possible design, the processing module is further configured to: if there is no idle second HARQ process, select a third HARQ process in the predetermined number of HARQ processes, and instruct the terminal to use the The three HARQ processes retransmit the data block.

In a possible design, the determining module is specifically configured to: select, from the preset number of HARQ processes, a HARQ process that has the longest time interval from the last use as the first HARQ process.

In a possible design, the determining module is further configured to: if there is no idle second HARQ process, select, from the preset number of HARQ processes, the HARQ process that has the longest time interval from the last time used. And as the third HARQ process, where the third HARQ process is the same as or different from the first HARQ process.

In a third aspect, a base station includes a transceiver, and at least one processor coupled to the transceiver, wherein:

A processor for reading a program in the memory, performing the following process:

When the base station and the terminal perform data transmission, the base station determines whether a preset number of hybrid automatic repeat request HARQ processes are occupied; if the preset number of HARQ processes are already occupied, the base station is from the Selecting a first HARQ process from a preset number of HARQ processes; and the base station performs the data transmission with the terminal by using the first HARQ process.

In a possible design, the processor is specifically configured to: send, according to the first HARQ process, a data block to the terminal by using a physical downlink shared channel; and receive HARQ feedback information sent by the terminal, the HARQ The feedback information indicates a receiving status of the data block; if the HARQ feedback information is an acknowledgement ACK or the first HARQ process reaches a preset maximum number of retransmissions, the data block is cleared.

In a possible design, the processor is further configured to: send, according to the first HARQ process, a data block to the terminal by using a downlink physical shared channel; and receive HARQ feedback information sent by the terminal, where The HARQ feedback information indicates a receiving state of the data block; if the HARQ feedback information is a negative acknowledgement NACK, determining whether there is an idle second HARQ process in the predetermined number of HARQ processes, if there is an idle second HARQ The process retransmits the data block using the second HARQ process.

In a possible design, the processor is further configured to: if there is no idle second HARQ process, select a third HARQ process to retransmit the data block in the predetermined number of HARQ processes.

In a possible design, the processor is specifically configured to: receive, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel; if the base station correctly receives the location sent by the terminal The data block or the first HARQ process reaches a preset maximum number of retransmissions, and the buffer of the first HARQ process is cleared.

In a possible design, the processor is specifically configured to: receive, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel; if the base station cannot correctly receive the sent by the terminal Determining whether the predetermined number of HARQ processes are present in the data block The idle second HARQ process, if there is an idle second HARQ process, instructing the terminal to retransmit the data block by using the second HARQ process.

In a possible design, the processor is further configured to: if there is no idle second HARQ process, select a third HARQ process in the predetermined number of HARQ processes, and instruct the terminal to use the The third HARQ process retransmits the data block.

In a possible design, the processor is specifically configured to: select, from the preset number of HARQ processes, a HARQ process that has the longest time interval from the last use as the first HARQ process.

In a possible design, the processor is specifically configured to: if there is no idle second HARQ process, select a HARQ process that has the longest interval from the last used time from the preset number of HARQ processes, And as the third HARQ process, where the third HARQ process is the same as or different from the first HARQ process.

In the embodiment of the present invention, a data transmission method and device are provided. When the base station and the terminal perform data transmission, the base station determines whether a preset number of hybrid automatic repeat request HARQ processes are occupied; A preset number of HARQ processes are already occupied, and the base station selects a first HARQ process from the preset number of HARQ processes; the base station performs the data transmission with the terminal by using the first HARQ process. The base station implements continuity of UE scheduling by multiplexing the HARQ process, and improves the scheduling rate of the UE. Further, by multiplexing the HARQ process, the UE scheduling duration is reduced, and the UE power loss is reduced.

DRAWINGS

FIG. 1 is a schematic diagram of a HARQ process data transmission process according to an embodiment of the present invention;

2 is a schematic diagram of a data transmission process of multiple HARQ processes according to an embodiment of the present invention;

3 is a schematic diagram of another multiple HARQ process data transmission process according to an embodiment of the present invention;

4 is a flowchart of a method for data transmission according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of another data transmission process according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an apparatus for data transmission according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of hardware of a device for data transmission according to an embodiment of the present invention.

detailed description

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the invention provides a method for data transmission. As shown in FIG. 4, the method includes the following process:

S11. When the base station performs data transmission with the terminal, the base station determines whether a preset number of hybrid automatic repeat request HARQ processes are occupied.

The terminal may be referred to as a user equipment, a mobile station, or a mobile terminal. The terminal may communicate with one or more core network devices via a Radio Access Network (RAN). For example, the terminal may be Mobile phones (or "cellular" phones) or computers with mobile terminals, etc., for example, the terminals can also be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange voice with the wireless access network. And / or data.

S12. If the preset number of HARQ processes are already occupied, the base station selects a first HARQ process from the preset number of HARQ processes.

Optionally, the base station selects, as the first HARQ process, a HARQ process that has the longest time interval from the most recent use from the preset number of HARQ processes.

For example, the base station performs data transmission with the terminal A by using a preset number of HARQ processes, and the preset number of HARQ processes are occupied. When the terminal B needs to perform data transmission with the base station, the base station is in the preset number of HARQs. A first HARQ process is selected in the process for multiplexing. As shown in FIG. 5, when all eight HARQs are occupied, if two new data blocks need to be transmitted, HARQ-0 and HARQ-1 are selected for multiplexing.

S13. The base station performs the data transmission with the terminal by using the first HARQ process.

In the embodiment of the present invention, when the base station and the terminal perform data transmission, the base station determines whether a preset number of HARQ processes are occupied; if the preset number of HARQ processes are already occupied, The base station selects a first HARQ process from the preset number of HARQ processes; the base station performs the data transmission with the terminal by using the first HARQ process. The base station implements continuity of UE scheduling by multiplexing the HARQ process, and improves the scheduling rate of the UE. Further, by multiplexing the HARQ process, the UE scheduling duration is reduced, and the UE power loss is reduced.

In S13, the data transmission includes downlink data transmission and uplink data transmission.

For the downlink data transmission, the base station performs the data transmission with the terminal by using the first HARQ process, specifically, according to the first HARQ process, the base station sends data to the terminal by using a physical downlink shared channel. The base station receives the HARQ feedback information sent by the terminal, where the HARQ feedback information indicates a receiving status of the data block; if the HARQ feedback information is an acknowledgement ACK or the first HARQ process reaches a preset The maximum number of retransmissions, the base station clearing the data block.

Optionally, the base station sends a data block to the terminal by using a downlink physical shared channel according to the first HARQ process; the base station receives HARQ feedback information sent by the terminal, where the HARQ feedback information indicates the data a receiving state of the block; if the HARQ feedback information is a negative acknowledgement NACK, the base station determines whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, the use The second HARQ process retransmits the data block.

Specifically, before the base station sends a data block to the terminal by using the PDSCH, the base station sends a DCI to the terminal by using an MPDCCH, where the DCI carries a New Data Indicator (NDI) value when used. When the second HARQ process performs data block retransmission, the NDI value carried in the DCI is different from the NDI value carried in the DCI that the base station sends to the UE last time.

Optionally, the base station sends a data block to the terminal by using a downlink physical shared channel according to the first HARQ process; the base station receives HARQ feedback information sent by the terminal, where the HARQ feedback information indicates the data a receiving state of the block; if the HARQ feedback information is a negative acknowledgment NACK, if there is no idle second HARQ process, the base station selects a third HARQ process to retransmit the data block in the predetermined number of HARQ processes.

Specifically, the base station selects, as the third HARQ process, the HARQ process that is the longest time interval from the most used one of the preset number of HARQ processes, where the third HARQ process and the first HARQ are The process is the same or different. Before the base station sends a data block to the terminal by using the PDSCH, the base station sends a DCI to the terminal by using an MPDCCH, where the DCI carries an NDI value, when the third HARQ process and the first HARQ process When the same, the NDI value carried in the DCI is the same as the NDI value carried in the DCI sent by the base station to the UE last time; when the third HARQ process is different from the first HARQ process, The NDI value carried in the DCI is different from the NDI value carried in the DCI that the base station sends to the UE last time.

For uplink data transmission, the base station performing data transmission with the terminal by using the first HARQ process includes:

The base station receives, according to the first HARQ process, the data block sent by the terminal by using a physical uplink shared channel; if the base station correctly receives the data block sent by the terminal or the first HARQ process reaches a preset The maximum number of retransmissions, the base station clearing the buffer of the first HARQ process, optionally, wherein the buffer includes a Medium Access Control Packet Data Unit (MAC PDU).

Optionally, the base station receives, according to the first HARQ process, the data block sent by the terminal by using a physical uplink shared channel; and if the base station cannot correctly receive the data block sent by the terminal, the base station determines Whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, the base station instructs the terminal to retransmit the data block by using the second HARQ process, where The failure to correctly receive includes a data verification error or the reception result is a discontinuous transmission (DTX).

Specifically, before the base station receives the data block sent by the terminal by using the PUSCH, the base station sends uplink control information (UCI) to the terminal through the MPDCCH, and uses the second HARQ process to perform data. When the block is retransmitted, the NDI value carried in the UCI is different from the NDI value carried in the UCI that the base station sends to the UE last time.

Optionally, if there is no idle second HARQ process, the base station selects a third HARQ process in the predetermined number of HARQ processes, and instructs the terminal to retransmit the data block by using the third HARQ process. . Specifically, if there is no idle second HARQ process, the base station selects, as the third HARQ process, the HARQ process that has the longest time interval from the most used one of the preset number of HARQ processes. The third HARQ process is the same as or different from the first HARQ process. Before the base station receives the data block sent by the terminal by using the PUSCH, the base station sends a UCI to the terminal by using an MPDCCH, where the UCI carries an NDI value, when the third HARQ process and the first HARQ When the process is the same, the NDI value carried in the UCI is the same as the NDI value carried in the UCI that the base station sends to the UE last time; when the third HARQ process is different from the first HARQ process, The NDI value carried in the UCI is different from the NDI value carried in the UCI that the base station sends to the UE last time.

Based on the same inventive concept, an embodiment of the present invention provides a base station. As shown in FIG. 6, the base station includes:

The determining module 61 is configured to determine whether a preset number of hybrid automatic repeat request HARQ processes are occupied when the base station to which the determining module belongs and the terminal perform data transmission;

The selecting module 62 is configured to select a first HARQ process from the preset number of HARQ processes if the preset number of HARQ processes are occupied.

The processing module 63 is configured to perform the data transmission with the terminal by using the first HARQ process.

In the embodiment of the present invention, a base station is configured, when the base station and the terminal perform data transmission, the base station determines whether a preset number of hybrid automatic repeat request HARQ processes are occupied; if the preset number of HARQs The processes are all occupied, and the base station selects a first HARQ process from the preset number of HARQ processes; the base station performs the data transmission with the terminal by using the first HARQ process. The base station implements continuity of UE scheduling by multiplexing the HARQ process, and improves the scheduling rate of the UE. Further, by multiplexing the HARQ process, the UE scheduling duration is reduced, and the UE power loss is reduced.

Optionally, the processing module is specifically configured to:

Transmitting, according to the first HARQ process, a data block to the terminal by using a physical downlink shared channel;

Receiving HARQ feedback information sent by the terminal, where the HARQ feedback information indicates a receiving status of the data block;

If the HARQ feedback information is an acknowledgement ACK or the first HARQ process reaches a preset maximum number of retransmissions, the data block is cleared.

Optionally, the processing module is specifically configured to:

Transmitting, according to the first HARQ process, a data block to the terminal by using a downlink physical shared channel;

If the HARQ feedback information is a negative acknowledgment NACK, determining whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, using the second HARQ process retransmission The data block.

Optionally, the processing module is further configured to:

If there is no idle second HARQ process, the third HARQ process is selected to retransmit the data block in the predetermined number of HARQ processes.

Optionally, the processing module is specifically configured to:

Receiving, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel;

If the base station correctly receives the data block sent by the terminal or the first HARQ process reaches a preset maximum number of retransmissions, clear the buffer of the first HARQ process.

Optionally, the processing module is specifically configured to:

Determining the predetermined number if the base station cannot correctly receive the data block sent by the terminal Whether there is an idle second HARQ process in the quantity of the HARQ process, and if there is an idle second HARQ process, the terminal is instructed to retransmit the data block by using the second HARQ process.

Optionally, the processing module is further configured to:

And if there is no idle second HARQ process, selecting a third HARQ process in the predetermined number of HARQ processes, and instructing the terminal to retransmit the data block by using the third HARQ process.

Optionally, the determining module is specifically configured to:

Selecting, from the preset number of HARQ processes, a HARQ process having the longest time interval from the last use as the first HARQ process.

Optionally, the determining module is further configured to:

If there is no idle second HARQ process, the HARQ process having the longest time interval from the last use is selected as the third HARQ process from the preset number of HARQ processes, wherein the third HARQ process Same or different from the first HARQ process.

In the embodiment of FIG. 7, the base station includes a transceiver 710, and at least one processor 700 coupled to the transceiver 710, wherein:

The processor 700 is configured to read a program in the memory 720 and perform the following process:

Here, in FIG. 7, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 700 and various circuits of memory represented by memory 720. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 710 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 can store data used by the processor 700 in performing operations.

Optionally, the processor 700 is configured to: send, according to the first HARQ process, a data block to the terminal by using a physical downlink shared channel; and receive HARQ feedback information sent by the terminal, where the HARQ feedback information indicates The receiving state of the data block; if the HARQ feedback information is an acknowledgment ACK or the first HARQ process reaches a preset maximum retransmission number, the data block is cleared.

Optionally, the processor 700 is further configured to: send, according to the first HARQ process, a data block to the terminal by using a downlink physical shared channel, and receive HARQ feedback information sent by the terminal, the HARQ feedback information. Determining a reception status of the data block; if the HARQ feedback information is a negative acknowledgement NACK, determining whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, using The second HARQ process retransmits the data block.

Optionally, the processor 700 is further configured to: if there is no idle second HARQ process, select a third HARQ process to retransmit the data block in the predetermined number of HARQ processes.

Optionally, the processor is specifically configured to: receive, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel; if the base station correctly receives the data block sent by the terminal, or The first HARQ process reaches a preset maximum number of retransmissions, and the buffer of the first HARQ process is cleared.

Optionally, the processor 700 is configured to: receive, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel; and if the base station cannot correctly receive the data sent by the terminal And determining, by the block, whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, instructing the terminal to retransmit the data block by using the second HARQ process.

Optionally, the processor 700 is further configured to: if there is no idle second HARQ process, select a third HARQ process in the predetermined number of HARQ processes, and instruct the terminal to use the third HARQ The process retransmits the data block.

Optionally, the processor 700 is specifically configured to: select, from the preset number of HARQ processes, a HARQ process that has the longest time interval from the last use, as the first HARQ Cheng.

Optionally, the processor 700 is specifically configured to: if there is no idle second HARQ process, select, from the preset number of HARQ processes, a HARQ process that has the longest time interval from the last use, as the a third HARQ process, wherein the third HARQ process is the same as or different from the first HARQ process.

It can be understood that the processor 700 controls the transceiver 710 to perform air interface information interaction between the base station and the terminal.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in a block or blocks of a flow or a flow and/or a block diagram of a flowchart Step.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A method of data transmission, characterized in that the method comprises:

When the base station performs data transmission with the terminal, the base station determines whether a preset number of hybrid automatic repeat request HARQ processes are occupied;

If the preset number of HARQ processes are already occupied, the base station selects a first HARQ process from the preset number of HARQ processes;

The base station performs the data transmission with the terminal by using the first HARQ process.
The method according to claim 1, wherein the base station performs the data transmission with the terminal by using the first HARQ process, including:

Transmitting, by the base station, a data block to the terminal by using a physical downlink shared channel, according to the first HARQ process;

Receiving, by the base station, HARQ feedback information sent by the terminal, where the HARQ feedback information indicates a receiving state of the data block;

The base station clears the data block if the HARQ feedback information is an acknowledgement ACK or the first HARQ process reaches a preset maximum number of retransmissions.
The method according to claim 1, wherein the base station performs the data transmission with the terminal by using the first HARQ process, including:

Transmitting, by the base station, a data block to the terminal by using a downlink physical shared channel, according to the first HARQ process;

Receiving, by the base station, HARQ feedback information sent by the terminal, where the HARQ feedback information indicates a receiving state of the data block;

If the HARQ feedback information is a negative acknowledgement NACK, the base station determines whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, using the second HARQ process Retransmit the data block.
The method of claim 3, wherein the method further comprises:

If there is no idle second HARQ process, the base station enters the predetermined number of HARQs The third HARQ process is selected to retransmit the data block.
The method according to claim 1, wherein the base station performs the data transmission with the terminal by using the first HARQ process, including:

The base station receives, according to the first HARQ process, the data block sent by the terminal by using a physical uplink shared channel;

If the base station correctly receives the data block sent by the terminal or the first HARQ process reaches a preset maximum number of retransmissions, the base station clears the buffer of the first HARQ process.
The method according to claim 1, wherein the base station performs the data transmission with the terminal by using the first HARQ process, including:

The base station receives, according to the first HARQ process, the data block sent by the terminal by using a physical uplink shared channel;

If the base station cannot correctly receive the data block sent by the terminal, the base station determines whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, The base station instructs the terminal to retransmit the data block using the second HARQ process.
The method of claim 6 wherein the method further comprises:

If there is no idle second HARQ process, the base station selects a third HARQ process in the predetermined number of HARQ processes, and instructs the terminal to retransmit the data block by using the third HARQ process.
The method according to any one of claims 1 to 7, wherein the selecting, by the base station, the first HARQ process from the preset number of HARQ processes comprises:

The base station selects, as the first HARQ process, the HARQ process having the longest time interval from the most recent use from the preset number of HARQ processes.
The method according to claim 4 or 7, wherein, if there is no idle second HARQ process, the base station selects a third HARQ process in the predetermined number of HARQ processes, including:

If there is no idle second HARQ process, the base station enters from the preset number of HARQs The process of selecting the HARQ process that is the longest from the most used time interval is used as the third HARQ process, wherein the third HARQ process is the same as or different from the first HARQ process.
A base station, characterized in that the base station comprises:

a determining module, configured to determine whether a preset number of hybrid automatic repeat request HARQ processes are occupied when the base station and the terminal to which the determining module belongs are used for data transmission;

Selecting a module, if the preset number of HARQ processes are occupied, for selecting a first HARQ process from the preset number of HARQ processes;

And a processing module, configured to perform the data transmission with the terminal by using the first HARQ process.
The base station according to claim 10, wherein the processing module is specifically configured to:

Transmitting, according to the first HARQ process, a data block to the terminal by using a physical downlink shared channel;

Receiving HARQ feedback information sent by the terminal, where the HARQ feedback information indicates a receiving status of the data block;

If the HARQ feedback information is an acknowledgement ACK or the first HARQ process reaches a preset maximum number of retransmissions, the data block is cleared.
The base station according to claim 10, wherein the processing module is specifically configured to:

Transmitting, according to the first HARQ process, a data block to the terminal by using a downlink physical shared channel;

Receiving HARQ feedback information sent by the terminal, where the HARQ feedback information indicates a receiving status of the data block;

If the HARQ feedback information is a negative acknowledgment NACK, determining whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, using the second HARQ process retransmission The data block.
The base station according to claim 12, wherein the processing module is further configured to:

If there is no idle second HARQ process, the third HARQ process is selected to retransmit the data block in the predetermined number of HARQ processes.
The base station according to claim 10, wherein the processing module is specifically configured to:

Receiving, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel;

If the base station correctly receives the data block sent by the terminal or the first HARQ process reaches a preset maximum number of retransmissions, clear the buffer of the first HARQ process.
The base station according to claim 10, wherein the processing module is specifically configured to:

Receiving, according to the first HARQ process, a data block sent by the terminal by using a physical uplink shared channel;

If the base station cannot correctly receive the data block sent by the terminal, determine whether there is an idle second HARQ process in the predetermined number of HARQ processes, and if there is an idle second HARQ process, instruct the terminal Retransmitting the data block using the second HARQ process.
The base station according to claim 15, wherein the processing module is further configured to:

And if there is no idle second HARQ process, selecting a third HARQ process in the predetermined number of HARQ processes, and instructing the terminal to retransmit the data block by using the third HARQ process.
The base station according to any one of claims 10 to 16, wherein the determining module is specifically configured to:

Selecting, from the preset number of HARQ processes, a HARQ process having the longest time interval from the last use as the first HARQ process.
The base station according to claim 13 or 16, wherein the determining module is further configured to:

If there is no idle second HARQ process, the HARQ process having the longest time interval from the last use is selected as the third HARQ process from the preset number of HARQ processes, wherein the third HARQ process Same or different from the first HARQ process.