WO2017166208A1

WO2017166208A1 - Uplink transmission method, base station, and ue

Info

Publication number: WO2017166208A1
Application number: PCT/CN2016/078147
Authority: WO
Inventors: 杨美英; 官磊
Original assignee: 华为技术有限公司
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2017-10-05
Also published as: CN108886793A

Abstract

The present invention relates to the field of communications, and provides an uplink transmission method, base station, and UE, used to at least solve, in a scenario of a base station instructing, in subframe #n, a UE unit to send a padding signal in subframe #n+4, a problem in which a lost UL grant in subframe #n influences uplink transmission in subframe #n+5, and solve, in a scenario in which absence of PUSCH transmission in subframe #n+4 causes that a UL grant is not sent in subframe #n, a problem in which no UL grant being sent in subframe #n influences uplink transmission in subframe #n+5. The method comprises: a base station sends, in a first subframe, to UE first downlink transmission information used to instruct the UE to send, in a second subframe, first uplink data, and to instruct the UE to send, in a third subframe, an uplink sounding signal. The second subframe and the third subframe are later than the first subframe in time, the second subframe and the third subframe are contiguous in time, and the second subframe is later than the third subframe.

Description

Uplink transmission method, base station and UE

Technical field

The present invention relates to the field of communications, and in particular, to an uplink transmission method, a base station, and a UE.

Background technique

LAA (Licensed-Assisted Access Uplink), including SRS (Sounding Reference Signal) transmission, PUSCH (Physical uplink sharing channel) transmission, and UL correlation Transmission of data, UL signaling, UL signals, and the like. The SRS is used for UL channel sounding, and the UE usually transmits the SRS in the last OFDM (Orthogonal Frequency Division Multiplexing) symbol of the uplink transmission subframe. In addition, a plurality of UEs (User Equipments) that transmit SRSs in the subframe multiplex the time-frequency resources, that is, the last OFDM symbols of the subframe, by frequency division and code division. If some UEs that do not need to transmit SRS need to send a PUSCH in the next subframe of the subframe, it is necessary to perform LBT (Listen before talk) on the symbol. In this way, the UE that is transmitting the SRS will cause interference to the UE that is performing the LBT, and the UE that performs the LBT detects that the channel is busy, so that the UL data cannot be transmitted in the next subframe.

In order to avoid the above problem, according to the existing LTE/LTE-A protocol standard, the UE that does not send the SRS can send a padding signal (such as padding SRS) at the time-frequency position of the SRS of other UEs to avoid sending the SRS. The interference caused by the UE to the UE that does not send the SRS. Specifically, the base station instructs the UE to transmit a padding signal on subframe #n+4 in the UL grant of subframe #n. Since the transmission of the SRS is always in the last OFDM symbol of the subframe or the first symbol of the next subframe, the transmission of the padding signal is also the last OFDM symbol of the subframe or the first symbol of the next subframe. .

When the UL grant of subframe #n is lost, the UE that does not need to transmit the SRS cannot determine whether the padding signal needs to be transmitted at #n+4. Or, when the subframe #n+4 has no PUSCH transmission, the subframe #n does not need to transmit the UL grant, so that the UE that does not need to transmit the SRS is needed. It is also impossible to determine if #n+4 needs to transmit a fill signal. If the UE needs to perform uplink data transmission in subframe #n+5, the UE does not transmit the padding signal in subframe #n+4, then LBT is performed in the last symbol of subframe #n+4, and then LBT will be used by other The UE transmits the SRS interference, and the UE listening channel is busy, so that the UE cannot perform normal UL data transmission in the subframe #n+5.

Summary of the invention

An embodiment of the present invention provides an uplink transmission method, a base station, and a UE, to at least solve the problem that the base station in the subframe #n indicates that the UE sends a padding signal in the subframe #n+4, and the UL grant loss pair of the subframe #n The uplink transmission of the subframe #n+5 causes an influence, or the subframe #n does not transmit the UL grant to the subframe in the scenario that the subframe #n does not transmit the UL grant because the subframe #n+4 has no PUSCH transmission. #n+5 The problem of uplink transmission is affected.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

In a first aspect, an uplink transmission method is disclosed, including:

The first base station transmits the first downlink transmission information to the user equipment UE in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and is used to indicate the UE. The uplink sounding signal is transmitted in the third subframe. The second subframe and the third subframe herein are later in time than the first subframe, the second subframe and the third subframe are consecutive in time and the The second subframe is later than the third subframe. The second subframe and the third subframe are consecutive in time, that is, the second subframe and the third subframe are two subframes that are temporally adjacent.

According to the timing relationship of the first subframe, the second subframe, and the third subframe, for example, the first subframe may be the n+1th subframe, and the second subframe may be the n+5 subframe, The three subframes may be the n+4th subframe. That is, the base station indicates that the UE transmits the uplink sounding signal in the n+4th subframe through the UL grant of the (n+1)th subframe, and instructs the UE to transmit the uplink data in the n+5th subframe.

In the prior art, the base station indicates in the UL grant of the subframe #n that the UE transmits the padding signal in the last symbol of the subframe #n+4. When the UL grant of subframe #n is lost, the UE that does not need to transmit the SRS cannot determine whether the padding signal needs to be transmitted at #n+4. If The UE needs to perform uplink data transmission in subframe #n+5, and the UE does not transmit the padding signal in subframe #n+4, and then performs LBT in the last symbol of subframe #n+4, and then the LBT is transmitted by other UEs. The interference of the SRS, the UE listening channel is busy, and the UE cannot perform normal UL data transmission in the subframe #n+5.

According to the method provided by the present invention, the base station in the UL grant of the downlink first subframe (subframe #n+1) instructs the UE to transmit uplink data in the second subframe (#n+5) and in the third subframe (sub In the frame #n+4), the uplink sounding signal needs to be sent, so that when the UL grant of the subframe #n is lost, the UE can still determine whether to send the uplink sounding signal in the subframe #n+4, thereby preventing the UE from transmitting the SRS in other UEs. When the LBT is performed, the SRS block (that is, the UE transmitting the SRS to interfere with the LBT of other UEs) is avoided, which affects the uplink transmission of the UE.

Optionally, the method further includes:

The base station sends the second downlink transmission information to the UE in the fifth subframe, where the second downlink transmission information is used to indicate that the UE sends the second uplink data and the uplink detection in the third subframe. signal. Or the second downlink transmission information is used only to indicate that the UE sends the uplink sounding signal in the third subframe does not indicate that the UE sends the second uplink data in the third subframe.

The third subframe here is later in time than the fifth subframe; the first subframe and the fifth subframe are consecutive in time and the first subframe is late in time In the fifth subframe. With reference to the above example, if the first subframe is the (N+1)th subframe, the fifth subframe may be the Nth subframe.

That is, the base station may also instruct the UE to transmit uplink data and an uplink sounding signal in the n+4th subframe in the nth subframe, or only instruct the UE to send an uplink sounding signal in the n+4th subframe.

According to the method provided by the present invention, the base station may display the uplink sounding signal in the third subframe (subframe #n+4) in addition to the first subframe (subframe #n+1), and may also be in the first subframe. The previous subframe (ie, the fifth subframe - subframe #n) indicates that the UE transmits an uplink sounding signal in the third subframe.

Optionally, the method further includes:

The base station configures the UE to send resource information of the uplink sounding signal in the third subframe, where the base station does not configure the UE to send the uplink sounding signal in the second subframe. Resource information. The resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.

In the present invention, the base station in the first subframe (subframe #n+1) indicates that the UE transmits uplink sounding information in the third subframe (subframe #n+4), so the base station configures the UE in the third subframe in advance. Send resource information of the uplink sounding signal. Referring to the prior art, the base station in the subframe #n+1 indicates that the UE sends an uplink sounding signal in the subframe #n+5, and the base station needs to configure the UE to send the uplink sounding signal in the second subframe (subframe #n+5). Resource information. In the present invention, the UE does not need to send the uplink sounding signal in the second subframe according to the indication of the base station in the first subframe. Therefore, the base station does not pre-configure the resource information for transmitting the uplink sounding signal in the second subframe for the UE.

Optionally, the uplink sounding signal is located in a last symbol in the third subframe, that is, the base station in the first subframe indicates that the UE sends an uplink sounding signal in a last symbol of the third subframe.

Optionally, the first uplink data occupies all symbols except the symbol occupied by the first signal in the second subframe, where the first signal includes an uplink demodulation reference signal and/or the uplink detection signal. .

Optionally, the uplink sounding signal is a sounding reference signal SRS; or the uplink sounding signal is a fill signal orthogonal to the SRS.

For example, the padding signal may be another SRS sequence orthogonal to the SRS being transmitted, a new SRS signal (since the transmission location or configuration parameters may be different from the existing SRS), and the SRS frequency division Orthogonal signals, signals orthogonal to the SRS code, DMRS signals, etc.

The UE may send the SRS or the padding signal in the third subframe according to the indication of the base station in the first subframe, so that the UE does not perform the LBT while the other UEs send the SRS, and prevents other UEs from sending the SRS to the LBT result of the UE. interference.

Optionally, the second subframe is a fourth subframe after the first subframe, that is, If the first subframe is subframe subframe #n+1, the second subframe is subframe #n+4. That is, the base station may instruct the UE to transmit an uplink sounding signal in subframe #n+4 in subframe #n+1. In addition, according to the criteria for uplink scheduling in the LTE protocol, the base station may instruct the UE to transmit uplink data in subframe #n+5 in subframe #n+1.

In a second aspect, an uplink transmission method is disclosed, including:

The user equipment UE receives the first downlink transmission information sent by the base station in the first subframe. The first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and the uplink sounding signal in the third subframe; the second subframe and the third subframe The second subframe is temporally consecutive with the third subframe, and the second subframe is later than the third subframe.

The UE performs channel sensing before transmitting the uplink sounding signal in the third subframe, that is, performs an LBT (Listen before talk) operation. Certainly, the UE first determines the time domain position for performing the LBT operation according to the time-frequency position of the uplink detection signal that is indicated by the first downlink transmission information, and generally performs the LBT at the previous time-frequency position of the time-frequency position of the uplink detection signal. . For example, if the UE sends the uplink sounding signal in the last symbol of the third subframe, the LBT needs to be performed in the second to last symbol of the third subframe.

If the operation of the LBT is successful, that is, the channel is idle, the UE sends the uplink sounding signal in the third subframe and sends the uplink subframe in the second subframe after the third subframe. First uplink data. That is to say, in the timing, the UE first performs channel sounding LBT, sends an uplink sounding signal after determining that the channel is idle, and then transmits uplink data.

In the prior art, the base station indicates in the UL grant of the subframe #n that the UE transmits the padding signal in the last symbol of the subframe #n+4. When the UL grant of subframe #n is lost, the UE that does not need to transmit the SRS cannot determine whether the padding signal needs to be transmitted at #n+4. If the UE needs to perform uplink data transmission in subframe #n+5, the UE does not transmit the padding signal in subframe #n+4, then LBT is performed in the last symbol of subframe #n+4, and then LBT will be used by other The UE transmits the SRS interference, and the UE listening channel is busy, so that the UE cannot perform normal UL data transmission in the subframe #n+5.

According to the method provided by the present invention, the base station in the UL grant of the downlink first subframe (subframe #n+1) instructs the UE to transmit uplink data in the second subframe (#n+5) and in the third subframe (sub In the frame #n+4), the uplink sounding signal needs to be sent, so that when the UL grant of the subframe #n is lost, the UE can still determine whether to transmit in the subframe #n+4 according to the UL grant of the base station in the subframe #n+1. The uplink detection signal prevents the UE from performing LBT when the other UEs transmit the SRS, thereby avoiding the impact of the SRS block (that is, the UE transmitting the SRS to the LBT of other UEs) affecting the uplink transmission of the UE.

Optionally, the method further includes:

Receiving, by the UE, the second downlink transmission information that is sent by the base station, where the second downlink transmission information is used by the UE to send the second uplink data and the uplink detection signal in the third subframe. Or the second downlink transmission information is used to indicate that the UE sends the uplink sounding signal in a third subframe. The third subframe is later in time than the fifth subframe; the first subframe and the fifth subframe are consecutive in time, and the first subframe is in time. Later than the fifth subframe.

Optionally, the UE is pre-configured to send resource information of the uplink sounding signal in the third subframe, where the UE is not pre-configured to send the uplink sounding signal in the second subframe. The resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.

In a third aspect, a base station is disclosed, including:

a sending unit, configured to send first downlink transmission information to the user equipment UE in the first subframe, where the first downlink transmission information is used to indicate that the UE sends in the second subframe The first uplink data is used to indicate that the UE sends an uplink sounding signal in the third subframe;

The second subframe and the third subframe are later in time than the first subframe, and the second subframe and the third subframe are consecutive in time and the The second subframe is later than the third subframe.

The base station provided by the present invention indicates that the UE transmits uplink data in the second subframe (#n+5) and in the third subframe (subframe) in the UL grant of the downlink first subframe (subframe #n+1). In the #n+4), the uplink sounding signal needs to be sent, so that when the UL grant of the subframe #n is lost, the UE can still determine whether to send the uplink in the subframe #n+4 according to the UL grant of the base station in the subframe #n+1. The detection signal prevents the UE from performing LBT when other UEs transmit the SRS, thereby avoiding the impact of the SRS block (that is, the UE transmitting the SRS to the LBT of other UEs) affecting the uplink transmission of the UE.

Optionally, the sending unit is further configured to send second downlink transmission information to the UE in a fifth subframe, where the second downlink transmission information is used to indicate that the UE sends in the third subframe. The second uplink data and the uplink sounding signal, or the second downlink transmission information, is used to indicate that the UE sends the uplink sounding signal in the third subframe;

The third subframe is later in time than the fifth subframe; the first subframe and the fifth subframe are consecutive in time and the first subframe is late in time. In the fifth subframe.

Optionally, the foregoing base station further includes a configuration unit,

The configuration unit is configured to: pre-configure resource information of the uplink sounding signal in the third subframe for the UE, and not pre-predetermine the UE in the second subframe. The resource information of the uplink sounding signal is configured, where the resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.

Optionally, the uplink sounding signal is located at a last symbol in the third subframe.

Optionally, the second subframe is a fourth subframe subsequent to the first subframe.

In a fourth aspect, a user equipment UE is disclosed, including:

a receiving unit, configured to receive first downlink transmission information that is sent by the base station in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and is used to indicate The UE sends an uplink sounding signal in a third subframe; the second subframe and the third subframe are later in time than the first subframe, and the second subframe and the first subframe The three subframes are consecutive in time, and the second subframe is later than the third subframe;

Listening to the LBT unit for performing an LBT operation before transmitting the uplink sounding signal in the third subframe;

And a sending unit, configured to send the uplink sounding signal in the third subframe and send the first uplink data in the second subframe if the LBT operation succeeds.

Optionally, the receiving unit is further configured to: receive, in a fifth subframe, second downlink transmission information that is sent by the base station, where the second downlink transmission information is used to indicate that the UE sends the third subframe The uplink data and the uplink downlink signal are used to indicate that the UE sends the uplink sounding signal in the third subframe;

The third subframe is later in time than the fifth subframe; the first subframe and the fifth subframe are consecutive in time, and the first subframe is in time. Late In the fifth subframe.

Optionally, the UE does not pre-configure resource information of the uplink sounding signal in the second subframe, and the UE is pre-configured with resources of the uplink sounding signal in the third subframe. And the information, where the resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a schematic diagram of a UE sending a padding signal according to an embodiment of the present invention;

2 is a schematic diagram of a method for avoiding interference of an SRS on a PUSCH according to an embodiment of the present invention;

3 is a schematic diagram of a communication system according to an embodiment of the present invention;

FIG. 3.1 is a timing relationship diagram of first, second, and third subframes according to an embodiment of the present invention;

4 is another schematic diagram of a communication system according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of an uplink transmission method according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an n+1th subframe indicating an uplink detection signal sent by an n+th subframe according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a base station instructing a UE to send an uplink sounding signal according to an embodiment of the present disclosure;

FIG. 8 is a structural block diagram of a base station according to an embodiment of the present invention;

FIG. 9 is a block diagram showing another structure of a base station according to an embodiment of the present invention;

FIG. 10 is a structural block diagram of a UE according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

First, several concepts related to the present invention are explained.

Multi-user scheduling: In the LTE communication system, in the same subframe, multiple communication terminals can simultaneously transmit signals or receive signals on the spectrum resources. That is, each user occupies part of the frequency domain resources, so that multiple users can be simultaneously multiplexed with spectrum resources.

LBT: Before a node occupies a channel to transmit a signal, it first needs to detect the channel. The detection mode may include energy detection, signal detection, and the like. After the channel usage right is obtained, the channel can be used to transmit signals.

Channel usage rights: The communication node obtains the permission to transmit signals on the channel in some way, and can be considered to obtain the right to use the channel. For example, the base station allocates channel resources through a scheduling algorithm, and the nodes that are scheduled are considered to have obtained channel usage rights. In the present invention, the UE specifically complies with the communication mechanism of the first listening and the subsequent transmission, and if the detection channel result is idle and data transmission is possible, it can also be regarded as obtaining the channel usage right.

Base station (eNB or cell or access network device): Typically, it is a signal sender in the downlink communication link. In the uplink communication link, it is a signal receiver, and a sender of control information (transmitter control signaling) or the like.

UE (User Terminal): Typically, it is the sender of the signal in the uplink communication link. In the downlink communication link is the receiver of the signal.

In the LAA UL (uplink) transmission in a multi-user scheduling scenario, The LBT mechanism is to be followed, that is, the UE needs to listen to the wireless channel before the signal is transmitted. Only the UE that is scheduled by the base station and whose channel listening result is idle (that is, obtains the channel usage right) can perform signal transmission. In addition, the LAA UL transmission includes SRS transmission, PUSCH (Physical uplink sharing channel) transmission, and transmission of other UL related data, signaling, signals, and the like. The SRS transmission is usually located in the last OFDM symbol of the subframe, and the multiple UEs sent by the base station in the subframe are multiplexed by the frequency division and the code division. On this symbol, some UEs that do not need to transmit SRS need to perform LBT on the symbol if the PUSCH needs to be transmitted in the next subframe.

At this time, there is a problem that the UE that is transmitting the SRS may cause interference to the UE that is performing the LBT, so that the UE listening channel that performs the LBT is busy, and thus the UL data cannot be transmitted in the next subframe. In order to avoid this problem, the scheme shown in FIG. 1 is proposed in the standard. Referring to FIG. 1, a UE (UE2) that needs to transmit a PUSCH in a next subframe may send one at a time-frequency position where other UEs (UE1) transmit SRS. The uplink sounding signal can align the LBT listening position, avoid the block of the SRS, and avoid the interference caused by the sending SRS on the PUSCH. Further, according to the existing LTE/LTE-A protocol standard, the base station instructs the UE to transmit a padding signal (ie, the uplink sounding signal) on the subframe #n+4 in the UL grant of the subframe #n. Since the transmission of the SRS is always in the last OFDM symbol of the subframe or the first symbol of the next subframe, the transmission of the padding signal is also the last OFDM symbol of the subframe or the first symbol of the next subframe. .

Referring to FIG. 2, when the UL grant of subframe #n is lost, the UE that does not need to transmit the SRS cannot determine whether the padding signal needs to be transmitted at #n+4. If the UE needs to perform uplink data transmission in subframe #n+5, the UE does not transmit the padding signal in subframe #n+4, then LBT is performed in the last symbol of subframe #n+4, and then LBT will be used by other The UE transmits the SRS interference, and the UE listening channel is busy, so that the UE cannot perform normal UL data transmission in the subframe #n+5.

The principle of the present invention is that the base station sends an uplink sounding signal in the UL subframe #n+4 in the UL grant of the DL subframe #n+1, thereby preventing the UE transmitting the SRS from causing the UL transmission of the UE not transmitting the SRS. influences. Meanwhile, even if the UL grant of the DL subframe #n is lost, it is also possible to avoid the UE transmitting the SRS from the UE not transmitting the SRS. The uplink transmission in subframe #n+5 has an effect.

Example 1:

An embodiment of the present invention provides a communication system. As shown in FIG. 3, the communication system includes a base station and at least one UE. The base station performs uplink scheduling on the UE by using the UL grant, and the UE needs to send an uplink sounding signal before transmitting the uplink data.

Further, the embodiment of the present invention uses an UE scheduled by the base station as an example to describe an uplink transmission method provided by an embodiment of the present invention.

As shown in FIG. 4, the base station 10 includes a processor 101, a transmitter 102, and a receiver 103, and a memory 104. The UE 20 includes a processor 201, a transmitter 202, and a receiver 203 and a memory 204.

In a specific implementation, the uplink transmission method provided by the present invention includes:

S1. The transmitter 101 of the base station sends the first downlink transmission information to the user equipment UE in the first subframe, indicating that the UE sends the first uplink data in the second subframe and is used to indicate that the UE is in the third subframe. An uplink sounding signal is transmitted in the frame. The receiver 203 receives the first downlink transmission information.

Referring to FIG. 3.1, the second subframe and the third subframe herein are later in time than the first subframe, and the second subframe and the third subframe are consecutive in time. And the second subframe is later than the third subframe. The second subframe and the third subframe are consecutive in time, that is, the second subframe and the third subframe are two subframes that are temporally adjacent.

S2. The processor 201 performs channel sensing before transmitting the uplink sounding signal in the third subframe, that is, performs an LBT (Listen before talk) operation.

Certainly, the UE first determines the time domain position for performing the LBT operation according to the time-frequency position of the uplink detection signal that is indicated by the first downlink transmission information, and generally performs the LBT at the previous time-frequency position of the time-frequency position of the uplink detection signal. . For example, if the UE sends the uplink sounding signal in the last symbol of the third subframe, the LBT needs to be performed in the second to last symbol of the third subframe.

S3. If the LBT operation is successful, that is, the channel is idle, the UE sends the uplink sounding signal in the third subframe and after the third subframe. The first uplink data is sent in two subframes.

That is to say, in the timing, the UE first performs channel sounding LBT, sends an uplink sounding signal after determining that the channel is idle, and then transmits uplink data.

It should be noted that the processor 101 and the processor 201 may be a central processing unit (English: central processing unit, abbreviated as CPU).

Transmitter 102, transmitter 202 can be implemented by a light emitter, an electrical transmitter, a wireless transmitter, or any combination thereof. For example, the light emitter can be a small form-factor pluggable transceiver (SFP) transmitter (English: transceiver), and the enhanced small form-factor pluggable (English: enhanced small form-factor pluggable, Abbreviation: SFP+) Transmitter or 10 Gigabit small form-factor pluggable (XFP) transmitter. The electric transmitter can be an Ethernet (Ethernet) network interface controller (English: network interface controller, abbreviation: NIC). The wireless transmitter can be a wireless network interface controller (English: wireless network interface controller, abbreviation: WNIC).

The receiver 103 and the receiver 203 can be implemented by an optical receiver, an electrical receiver, a wireless receiver, or any combination thereof. For example, the optical receiver can be a small package pluggable receiver, an enhanced small package pluggable receiver or a 10 gigabit small package pluggable receiver. The electrical receiver can be an Ethernet network interface controller. The wireless receiver can be a wireless network interface controller.

A memory 104 (memory 204) for storing program code and transmitting the program code to the processor 101 (processor 201), the processor 101 (processor 201) executing the following instructions in accordance with the program code. The memory 104 (memory 204) may include a volatile memory (English: volatile memory), such as random-access memory (abbreviation: RAM); the memory 104 (memory 204) may also include non-volatile Memory (English: non-volatile memory), such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or Solid state drive (English: solid-state drive, abbreviation: SSD). The memory 104 (memory 204) may also include a combination of the above types of memories.

Example 2:

An embodiment of the present invention provides an uplink transmission method. As shown in FIG. 5, the method includes the following steps:

301. The UE acquires resource information of an uplink sounding signal.

The resource information is resource information that the base station configures for the UE to send an uplink sounding signal in a third subframe (which may be the subframe #n+4), but the base station does not configure the UE in the The resource information of the uplink sounding signal is transmitted in the second subframe (subframe #n+5). The second subframe here is contiguous with the third subframe and the second subframe is later than the third subframe.

It should be noted that the resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal. In addition, the uplink sounding signal is a sounding reference signal SRS. Alternatively, it may be a padding SRS that is orthogonal to the SRS in signal form. The padding signal may be another SRS sequence orthogonal to the SRS being transmitted, a new SRS signal (since the transmission location or configuration parameters may be different from the existing SRS), and the SRS frequency division is orthogonal The signal, the signal orthogonal to the SRS code, the DMRS signal, and the like.

In a specific implementation, the resource information of the uplink sounding signal may be pre-configured by the base station, and notified to the UE by static, semi-static, or dynamic signaling. For example, RRC signaling, UL grant signaling, and other forms of signaling. Of course, it can also be obtained by the UE according to a predefined rule, which is not limited herein.

The base station sends the first downlink transmission information to the user equipment UE in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and is used to indicate the location. The UE transmits an uplink sounding signal in the third subframe.

The second subframe and the third subframe herein are later in time than the first subframe, the second subframe and the third subframe are consecutive in time and the The second subframe is later than the third subframe. The second subframe and the third subframe are consecutive in time, that is, the second subframe and the third subframe are two subframes that are temporally adjacent.

According to the timing relationship of the first subframe, the second subframe, and the third subframe, for example, the first subframe may be the n+1th subframe, and the second subframe may be the n+5 subframe, Three sons The frame can be the n+4th subframe. For example, referring to FIG. 6, the base station indicates that the UE sends an uplink sounding signal in the n+4th subframe through the UL grant of the (n+1)th subframe, and instructs the UE to transmit uplink data in the (n+5th) subframe.

In a specific implementation, the first downlink transmission information indicates a time domain OFDM symbol of the uplink sounding signal. The DL subframe carrying the first downlink transmission information may be an authorized carrier or an unlicensed carrier.

In addition, the base station may directly indicate the OFDM symbol position of the uplink sounding signal transmitted in the third subframe in the first subframe, and the UE scheduled by the first downlink transmission information may send the SRS in the third subframe subframe, and also send Fill the signal. Then, the UE reserves the transmission time of the padding signal or the SRS when performing uplink data transmission in the subframe #n+4. Alternatively, the base station may directly indicate the location where the third subframe of the UE performs the LBT in the first subframe, so that the UE acquires the time for transmitting the uplink data in the subframe and the time for transmitting the SRS according to the location where the LBT is performed. Further, the base station may indicate, in the first subframe, the transmission of the uplink sounding signal of the at least one subframe after the third subframe by using the first downlink transmission information.

Optionally, the base station may also indicate, in the previous subframe of the first subframe, the fifth subframe (which may be the subframe #n), whether the third subframe needs to transmit the uplink detection signal, and of course, the fifth subframe. Frames may also not be indicated. If the fifth subframe indicates whether the UE needs to transmit the uplink sounding signal in the third subframe, specifically, the base station sends the second downlink transmission information to the UE in the fifth subframe, where the second downlink transmission information is used. Instructing the UE to send the second uplink data and the uplink sounding signal in the third subframe. Or the second downlink transmission information is used only to indicate that the UE sends the uplink sounding signal in the third subframe does not indicate that the UE sends the second uplink data in the third subframe. The first downlink transmission information and the second downlink transmission information in the embodiment of the present invention may be a UL grant sent by the base station to the UE.

If the UE can receive the second downlink transmission information that is sent by the fifth subframe of the base station, the uplink detection signal may be sent according to the indication of the second downlink transmission information; otherwise, the UE can only receive the information received in the first subframe. The first downlink transmission information determines whether to send the uplink sounding signal and information related to transmitting the uplink sounding signal.

303. The UE acquires a related configuration that performs LBT in the third subframe.

Here, the UE acquires the relevant configuration of the LBT, which may be predefined by the base station or configured by the base station. Specifically, the base station may notify the UE by static, or semi-static, or dynamic signaling, and further, may be RRC signaling or UL grant signaling.

In addition, the relevant configuration of the LBT may be LBT time domain location information, frequency domain location information, LBT CCA (clear channel assessment) threshold related information, contention window related information, and other LBT related configurations.

The time domain location information of the LBT may be configured by the base station, or may be calculated by the UE according to the time domain location of the uplink sounding reference signal, that is, the time domain information of the LBT is not required to be configured by the base station at this time. The LBT can usually be performed at the previous time-frequency position at which the time-frequency position of the uplink sounding signal is transmitted. For example, if the UE sends the uplink sounding signal in the last symbol of the third subframe, the LBT needs to be performed in the second to last symbol of the third subframe.

Of course, the UE may determine the LBT operation at any time in the receiving mode, that is, the UE does not need to configure the time domain information of the LBT at the same time, and the UE does not need to send the uplink sounding reference signal according to the signal. The time domain location determines the time to perform the LBT operation.

304. The UE performs an LBT operation before sending the uplink sounding signal in the third subframe.

The so-called LBT operation is performed by performing channel interception to determine whether channel occupancy rights are obtained.

305. If the LBT operation is successful, the UE sends the uplink sounding signal in the third subframe and sends the first uplink data in a second subframe after the third subframe.

The operation of the LBT succeeds in detecting that the channel is idle. That is to say, in the timing, the UE first performs channel sounding LBT, sends an uplink sounding signal after determining that the channel is idle, and then transmits uplink data.

If the LBT operation fails, the channel is busy, the UE cannot send the uplink sounding signal in the third subframe, and the first uplink data cannot be sent in the second subframe.

Further, in the embodiment of the present invention, the timing information of the first subframe and the second subframe may be not limited. The subframe frame defined by the present invention according to the existing LTE/LTE-A protocol And the UL data transmission timing relationship, the second subframe may be the fourth subframe after the first subframe, taking the normal single subframe scheduling as an example, and the scheduling granularity is one LTE/LTE-A subframe, that is, 1 ms. Specifically, for cross-subframe scheduling or multi-subframe scheduling, one DL subframe may indicate scheduling of multiple UL subframes, and if it is single subframe scheduling, that is, one UL subframe of one DL subframe schedules one UL subframe. The DL subframe #n+1UL grant information indicates the transmission of the SRS (or padding signal) of the UL subframe #n+4, that is, the base station instructs the UE to transmit the uplink sounding signal in the subframe #n+4 in the subframe #n+1. . In addition, the subframe #n+1 may also indicate the transmission of the uplink sounding signal of the UL subframe after the UL subframe #n+4.

However, the present invention is not limited to the existing LTE/LTE-A subframe size, timing, and delay relationship. To support cross-subframe scheduling or multi-subframe scheduling, and shorter time subframes, the subframe size 1ms can be expressed as x milliseconds (ms), and the scheduling subframe can be represented as the n+ax subframe, scheduling and data transmission. The delay between them can be expressed as an n+kx subframe, where k is a multiple of a. That is, the base station schedules the subframe #n+kx in the subframe #n+ax. Specifically, taking a=1 as an example, in subframe #n+ax, that is, subframe n+x, scheduling subframe n+3x, applied to the present invention, referring to FIG. 7, the base station is in the subframe. #n+(a+1)x indicates that the UE transmits an SRS or padding signal at #n+kx.

Example 3:

An embodiment of the present invention provides a base station. As shown in FIG. 8, the base station includes a sending unit 401.

The sending unit 401 is configured to send the first downlink transmission information to the user equipment UE in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and uses Instructing the UE to send an uplink sounding signal in a third subframe number.

The sending unit 401 is further configured to send the second downlink transmission information to the UE in the fifth subframe, where the second downlink transmission information is used to indicate that the UE sends the second uplink in the third subframe. The data and the uplink sounding signal, or the second downlink transmission information, are used to indicate that the UE sends the uplink sounding signal in the third subframe.

As shown in FIG. 9, the base station further includes a configuration unit 402.

The configuration unit 402 is configured to: pre-configure the resource information of the uplink sounding signal in the third subframe for the UE, and not pre-configure the uplink in the second subframe for the UE. The resource information of the sounding signal, wherein the resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.

It should be noted that the uplink sounding signal is located in the last symbol in the third subframe.

The first uplink data occupies all symbols except the symbol occupied by the first signal in the second subframe, and the first signal includes an uplink demodulation reference signal and/or the uplink sounding signal.

The uplink sounding signal is a sounding reference signal SRS; or the uplink sounding signal is a filling signal orthogonal to the SRS.

The second subframe is a fourth subframe subsequent to the first subframe.

It should be noted that the sending unit 401 in this embodiment may be a transmitter of a base station. The setting unit 402 can be implemented in the processor of the base station, or can be stored in the memory of the base station in the form of program code, and is called by the processor in the memory. The stored code performs the functions of the above setting unit 402.

Example 4:

An embodiment of the present invention provides a user equipment UE. As shown in FIG. 10, the UE includes:

The receiving unit 501 is configured to receive the first downlink transmission information that is sent by the base station in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and is used by Instructing the UE to send an uplink sounding signal in a third subframe; the second subframe and the third subframe are later in time than the first subframe, the second subframe and the second subframe The third subframe is contiguous in time, and the second subframe is later than the third subframe.

The LBT unit 502 is first listened to for performing an LBT operation before transmitting the uplink sounding signal in the third subframe.

The sending unit 503 is configured to: if the LBT operation succeeds, send the uplink sounding signal in the third subframe and send the first uplink data in the second subframe.

The receiving unit 501 is further configured to receive, in a fifth subframe, second downlink transmission information that is sent by the base station, where the second downlink transmission information is used to instruct the UE to send second uplink data in a third subframe. And the uplink sounding signal, or the second downlink transmission information, is used to indicate that the UE sends the uplink sounding signal in a third subframe.

The third subframe is later in time than the fifth subframe; the first subframe and the fifth subframe are consecutive in time, and the first subframe is in time. Later than the fifth subframe.

It is to be noted that the UE does not pre-configure the resource information of the uplink sounding signal in the second subframe, and the UE is pre-configured with the uplink sounding signal in the third subframe. The resource information, where the resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.

The uplink sounding signal is located at the last symbol in the third subframe.

The second subframe is a fourth subframe subsequent to the first subframe.

The UE provided by the present invention transmits uplink data in the second subframe (#n+5) according to the indication in the UL grant of the downlink first subframe (subframe #n+1) and in the third subframe (subframe) In the #n+4), the uplink sounding signal needs to be sent, so that when the UL grant of the subframe #n is lost, the UE can still determine whether to send the uplink in the subframe #n+4 according to the UL grant of the base station in the subframe #n+1. The detection signal prevents the UE from performing LBT when other UEs transmit the SRS, thereby avoiding the impact of the SRS block (that is, the UE transmitting the SRS to the LBT of other UEs) affecting the uplink transmission of the UE.

It should be noted that, in this embodiment, the receiving unit 501 may be a receiver of the UE, and the sending unit 503 may be a transmitter of the UE, and the transmitter of the UE may integrate with the receiving transceiver of the UE. The LBT unit 502 can be implemented in the processor of the UE. In addition, it can also be stored in the memory of the UE in the form of program code, and the code stored in the memory is called by the processor to perform the functions of the LBT unit 502 above.

Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is illustrated. In practical applications, the above functions can be allocated according to needs. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the device described above, Reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

The units described as separate components may or may not be physically separated, and the components displayed as units may be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a device (which may be a microcontroller, chip, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

An uplink transmission method, comprising:

The first base station transmits the first downlink transmission information to the user equipment UE in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and is used to indicate the UE. Sending an uplink sounding signal in the third subframe;

The second subframe and the third subframe are later in time than the first subframe, and the second subframe and the third subframe are consecutive in time and the The second subframe is later than the third subframe.
The method of claim 1 further comprising:

The base station sends the second downlink transmission information to the UE in the fifth subframe, where the second downlink transmission information is used to indicate that the UE sends the second uplink data and the uplink detection in the third subframe. The signal, or the second downlink transmission information, is used to indicate that the UE sends the uplink sounding signal in the third subframe;

The third subframe is later in time than the fifth subframe; the first subframe and the fifth subframe are consecutive in time and the first subframe is late in time. In the fifth subframe.
Method according to claim 1 or 2, characterized in that

The base station does not pre-configure the resource information of the uplink sounding signal in the second subframe, and the base station is configured by the UE in the third subframe to pre-configure the uplink sounding signal. The resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.
A method according to any one of claims 1 to 3, characterized in that

The uplink sounding signal is located at the last symbol in the third subframe.
A method according to any one of claims 1 to 4, characterized in that

The first uplink data occupies all symbols except the symbol occupied by the first signal in the second subframe, and the first signal includes an uplink demodulation reference signal and/or the uplink sounding signal.
Method according to any one of claims 1 to 5, wherein said said The uplink sounding signal is a sounding reference signal SRS; or

The uplink sounding signal is a fill signal orthogonal to the SRS.
The method according to any one of claims 1 to 6, wherein the second subframe is a fourth subframe after the first subframe.
An uplink transmission method, comprising:

The user equipment UE receives the first downlink transmission information that is sent by the base station in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and is used to indicate the The UE sends an uplink sounding signal in a third subframe; the second subframe and the third subframe are later in time than the first subframe, and the second subframe and the third subframe are The frame is continuous in time, and the second subframe is later than the third subframe;

The UE performs a listen-before-issue LBT operation before transmitting the uplink sounding signal in the third subframe;

If the LBT operation is successful, the UE sends the uplink sounding signal in the third subframe and sends the first uplink data in the second subframe.
The method of claim 8 further comprising:

Receiving, by the UE, the second downlink transmission information that is sent by the base station, where the second downlink transmission information is used by the UE to send the second uplink data and the uplink detection signal in the third subframe. Or the second downlink transmission information is used to indicate that the UE sends the uplink sounding signal in a third subframe;

The third subframe is later in time than the fifth subframe; the first subframe and the fifth subframe are consecutive in time, and the first subframe is in time. Later than the fifth subframe.
Method according to claim 8 or 9, characterized in that

The UE is not configured with the resource information of the uplink sounding signal in the second subframe, and the UE is pre-configured with the resource information of the uplink sounding signal in the third subframe, where The resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.
A method according to any one of claims 8 to 10, characterized in that

The uplink sounding signal is located at the last symbol in the third subframe.
A method according to any one of claims 8 to 11, wherein

The first uplink data occupies all symbols except the symbol occupied by the first signal in the second subframe, and the first signal includes an uplink demodulation reference signal and/or the uplink sounding signal.
The method according to any one of claims 8 to 12, wherein the uplink sounding signal is a sounding reference signal SRS; or

The uplink sounding signal is a fill signal orthogonal to the SRS.
The method according to any one of claims 8 to 13, wherein the second subframe is a fourth subframe after the first subframe.
A base station, comprising:

a sending unit, configured to send the first downlink transmission information to the user equipment UE in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and is used by Instructing the UE to send an uplink sounding signal in a third subframe;

The second subframe and the third subframe are later in time than the first subframe, and the second subframe and the third subframe are consecutive in time and the The second subframe is later than the third subframe.
The base station according to claim 15, wherein the sending unit is further configured to: send, in a fifth subframe, second downlink transmission information to the UE, where the second downlink transmission information is used to indicate the UE Transmitting the second uplink data and the uplink sounding signal in the third subframe, or the second downlink transmission information is used to indicate that the UE sends the uplink sounding signal in the third subframe;

The third subframe is later in time than the fifth subframe; the first subframe and the fifth subframe are consecutive in time and the first subframe is late in time. In the fifth subframe.
The base station according to claim 15 or 16, further comprising a configuration unit,

The configuration unit is configured to: pre-configure the resource information of the uplink sounding signal in the third subframe for the UE, and not pre-configure the uplink sounding in the second subframe Resource information of a signal, wherein the resource information includes the uplink At least one of time domain resource information, frequency domain resource information, and code domain resource information of the sounding signal.
The base station according to any one of claims 15-17, wherein the uplink sounding signal is located at a last symbol in the third subframe.
The base station according to any one of claims 15 to 18, wherein the first uplink data occupies all symbols except the symbol occupied by the first signal in the second subframe, the first signal The uplink demodulation reference signal and/or the uplink sounding signal are included.
The base station according to any one of claims 15 to 19, wherein the uplink sounding signal is a sounding reference signal SRS; or

The uplink sounding signal is a fill signal orthogonal to the SRS.
The base station according to any one of claims 15 to 20, wherein the second subframe is a fourth subframe after the first subframe.
A user equipment (UE), comprising:

a receiving unit, configured to receive first downlink transmission information that is sent by the base station in the first subframe, where the first downlink transmission information is used to indicate that the UE sends the first uplink data in the second subframe and is used to indicate The UE sends an uplink sounding signal in a third subframe; the second subframe and the third subframe are later in time than the first subframe, and the second subframe and the first subframe The three subframes are consecutive in time, and the second subframe is later than the third subframe;

Listening to the LBT unit for performing an LBT operation before transmitting the uplink sounding signal in the third subframe;

And a sending unit, configured to send the uplink sounding signal in the third subframe and send the first uplink data in the second subframe if the LBT operation succeeds.
The UE according to claim 22, wherein the receiving unit is further configured to: receive, in a fifth subframe, second downlink transmission information sent by the base station, where the second downlink transmission information is used to indicate the The UE sends the second uplink data and the uplink sounding signal in the third subframe, or the second downlink transmission information is used to indicate that the UE sends the uplink sounding signal in the third subframe.

The third subframe is later in time than the fifth subframe; the first subframe And the fifth subframe is continuous in time, and the first subframe is later in time than the fifth subframe.
The UE according to claim 22 or 23, characterized in that

The UE is not configured with the resource information of the uplink sounding signal in the second subframe, and the UE is pre-configured with the resource information of the uplink sounding signal in the third subframe, where The resource information includes at least one of time domain resource information, frequency domain resource information, and code domain resource information of the uplink sounding signal.
The UE according to any one of claims 22 to 24, wherein the uplink sounding signal is located at a last symbol in the third subframe.
The UE according to any one of claims 22-25, wherein the first uplink data occupies all symbols except the symbol occupied by the first signal in the second subframe, the first signal The uplink demodulation reference signal and/or the uplink sounding signal are included.
The UE according to any one of claims 22 to 26, wherein the uplink sounding signal is a sounding reference signal SRS; or

The uplink sounding signal is a fill signal orthogonal to the SRS.
The UE according to any one of claims 22-27, wherein the second subframe is a fourth subframe after the first subframe.