CN105939187A

CN105939187A - Sounding reference signal enhancement method under unlicensed spectrum and related equipment

Info

Publication number: CN105939187A
Application number: CN201610387768.8A
Authority: CN
Inventors: 朱广勇
Original assignee: Shenzhen Jinli Communication Equipment Co Ltd
Current assignee: Shenzhen Jinli Communication Equipment Co Ltd
Priority date: 2016-06-02
Filing date: 2016-06-02
Publication date: 2016-09-14

Abstract

The embodiment of the invention discloses a sounding reference signal enhancement method under an unlicensed spectrum and related equipment. The method may comprise the step of detecting whether a target channel is in an idle state or not on a blank sub-frame after UE receives SRS (sounding reference signal) configuration information sent by a base station; and reporting an SRS to the base station according to the SRS configuration information if the target channel is in the idle state, thereby enabling the base station to carry out channel estimation on the target channel according to the SRS, wherein the SRS configuration information is used for indicating that the UE reports the SRS to the base station in a preset symbol of a preset sub-frame, and the SRS configuration information comprises an SRS transmission mode and an SRS transmission position of the UE. Through adoption of the mode, the problem that on the unlicensed spectrum, when the UE transmitting PUSCH (Physical Uplink Shared Channel) data in a certain spectrum resource is different from the UE reporting the SRS, the UE reporting the SRS delays report of the SRS or event cannot report the SRS due to the fact that the channel is busy can be solved.

Description

Method for enhancing sounding reference signal under unlicensed spectrum and related equipment

Technical Field

The invention relates to the technical field of communication, in particular to a method for enhancing a sounding reference signal under an unlicensed spectrum and related equipment.

Background

With the dramatic increase in communication traffic, licensed spectrum appears to be less and less sufficient to provide higher network capacity. Therefore, the third Generation Partnership Project (3GPP) introduced the concept of Licensed Assisted Access (LAA), i.e. Long Term Evolution (LTE) network technology is used in unlicensed spectrum, and based on the architecture of carrier aggregation, a Licensed band carrier is used as a primary cell, and an unlicensed spectrum carrier can only be used as a secondary cell. In order to avoid collision between devices operating on an unlicensed spectrum, an LTE network employs a Listen Before Talk (LBT) channel contention access mechanism, that is, a User Equipment (UE) can occupy a channel only when detecting that the channel is in an idle state on the unlicensed spectrum.

In an LTE network, before performing Physical Uplink Shared Channel (PUSCH) data transmission, a UE reports a Sounding Reference Signal (SRS) to a base station, so that the base station uses the SRS to evaluate Uplink channel quality. In an unlicensed spectrum, before reporting an SRS, a certain UE performs LBT detection on a subframe before an SRS subframe is transmitted, and if there is data transmission performed by other UEs, the UE detects that a channel is in a busy state, so that SRS reporting by the UE is delayed, or even SRS reporting cannot be performed.

Disclosure of Invention

The embodiment of the invention discloses a method for enhancing a sounding reference signal under an unlicensed spectrum and related equipment, which can solve the problem that the UE on the unlicensed spectrum has SRS reporting delay or even cannot report the SRS due to the fact that the UE detects that a channel is busy.

The first aspect of the embodiments of the present invention discloses a method for enhancing an SRS in an unlicensed spectrum, where the method may include:

a User Equipment (UE) receives SRS configuration information sent by a base station, wherein the SRS configuration information is used for indicating the UE to report an SRS to the base station in a preset symbol of a preset subframe, and the SRS configuration information comprises an SRS transmission mode of the UE and an SRS transmission position of the UE;

the UE detects whether a target channel is in an idle state on a blank subframe, wherein the target channel is located in an unlicensed spectrum;

and under the condition that the target channel is in an idle state, reporting the SRS to the base station by the UE at the SRS transmission position according to the SRS transmission mode, so that the base station carries out channel estimation on the target channel according to the SRS.

The second aspect of the embodiment of the present invention discloses another method for SRS enhancement in an unlicensed spectrum, where the method may include:

a base station sends SRS configuration information, wherein the SRS configuration information is used for indicating UE (user equipment) accessing the base station to report SRS to the base station in a preset symbol of a preset subframe, and the SRS configuration information comprises an SRS transmission mode of the UE and an SRS transmission position of the UE;

the base station receives an SRS reported on the SRS transmission position according to the SRS transmission mode under the condition that the UE detects that a target channel is in an idle state on a blank subframe, wherein the target channel is positioned in an unauthorized frequency spectrum;

and the base station carries out channel estimation on the target channel according to the SRS.

A third aspect of the embodiments of the present invention discloses a UE, where the base station may include:

a receiving unit, configured to receive SRS configuration information sent by a base station, where the SRS configuration information is used to instruct the UE to report an SRS to the base station in a preset symbol of a preset subframe, and the SRS configuration information includes an SRS transmission mode of the UE and an SRS transmission position of the UE;

a detecting unit, configured to detect whether a target channel is in an idle state on a blank subframe, where the target channel is located in an unlicensed spectrum;

and a sending unit, configured to report an SRS to the base station at the SRS transmission position according to the SRS transmission mode when the target channel is in an idle state, so that the base station performs channel estimation on the target channel according to the SRS.

The fourth aspect of the present invention discloses a base station, where the UE includes:

a sending unit, configured to send SRS configuration information, where the SRS configuration information is used to instruct a UE accessing the base station to report an SRS to the base station within a preset symbol of a preset subframe, and the SRS configuration information includes an SRS transmission mode of the UE and an SRS transmission position of the UE;

a receiving unit, configured to receive an SRS reported at the SRS transmission position according to the SRS transmission mode when the UE detects that a target channel is in an idle state on a blank subframe, where the target channel is located in an unlicensed spectrum;

and the channel estimation unit is used for carrying out channel estimation on the target channel according to the SRS.

The embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, after receiving SRS configuration information sent by a base station, a UE (user equipment) can firstly detect whether a target channel is in an idle state on a blank subframe, and if the target channel is in the idle state, the UE reports an SRS to the base station according to the SRS configuration information so that the base station performs channel estimation on the target channel according to the SRS, wherein the SRS configuration information is used for indicating the UE to report the SRS to the base station in a preset symbol of the preset subframe, the SRS configuration information comprises an SRS transmission mode and an SRS transmission position of the UE, and the blank subframe comprises a symbol before the preset symbol in the preset subframe. By the method, the problem that the UE reported by the SRS can not report the SRS even if the SRS reporting delay occurs because the UE reported by the SRS detects that the channel is busy on an unauthorized frequency spectrum when the PUSCH data transmission in a certain frequency spectrum resource is different from the UE reported by the SRS.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic flowchart of a method for SRS enhancement in an unlicensed spectrum according to an embodiment of the present invention;

fig. 2a is a schematic diagram of different scenarios of UE for PUSCH data transmission and SRS reporting in the prior art;

fig. 2b is a schematic diagram of different scenarios of UE for PUSCH data transmission and SRS reporting disclosed in the embodiment of the present invention;

fig. 3 is a flowchart illustrating another method for SRS enhancement in an unlicensed spectrum according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a UE according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another UE disclosed in the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another base station disclosed in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a method for enhancing a sounding reference signal under an unlicensed spectrum and related equipment, which can solve the problem that the UE on the unlicensed spectrum has SRS reporting delay or even cannot report the SRS due to the fact that the UE detects that a channel is busy. The following are detailed below.

The techniques described herein may be used for various wireless communication networks, such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA) networks, Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other networks, the terms "network" and "System" are generally used interchangeably, CDMA networks may implement broadband wireless technologies such as Universal Terrestrial Radio Access (UTRA), Telecommunications Industry Association (TIA), wcdma a) technologies, and other technologies such as CDMA-Telecommunications System (gsm-IS) and other technologies such as CDMA-Telecommunications Association (gsm-IS) technologies including CDMA-95 and gsm-95 technologies, GSM) or the like. OFDMA systems may implement wireless technologies such as evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE802.11 (Wireless Fidelity), IEEE802.16 (Worldwide Interoperability for microwave Access), IEEE802.20, Flash-OFDMA, and the like. UTRA and E-UTRA technologies are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and LTE-advanced (LTE-A) are newer versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation partnership project" (3 GPP). UMB is described in a document from an organization called "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for the wireless networks and radio access technologies mentioned above, as well as other wireless networks and radio access technologies. For clarity, certain aspects of the technology are described below with respect to LTE or LTE-a (or collectively "LTE/-a"), and such LTE/-a terminology is used in much of the description below.

An enodeb (enb) may be a station that communicates with UEs and may also be referred to as a base station, a node B, an access point, etc. Each eNB may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to this particular geographic coverage area of an eNB and/or of an eNB subsystem serving this coverage area, depending on the context in which the term is used.

An eNB may provide communication coverage for a macro cell, pico cell, femto cell, and/or other types of cells. A macro cell typically covers a relatively large geographic area (e.g., a range with a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions with the network provider. Pico cells generally cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. Femtocells also typically cover relatively small geographic areas (e.g., homes), and may provide restricted access by UEs having an association with the femtocell (e.g., UEs in a Closed Subscriber Group (CSG), UEs of users in the home, etc.) in addition to unrestricted access. The enbs of the macro cell may be referred to as macro enbs. An eNB for a pico cell may be referred to as a pico eNB. And, an eNB of a femto cell may be referred to as a femto eNB or a home eNB.

Referring to fig. 1, fig. 1 is a flowchart illustrating a method for SRS enhancement in an unlicensed spectrum according to an embodiment of the present invention. The method shown in fig. 1 may be applied to a scenario where different UEs for PUSCH data transmission and SRS reporting exist in a certain spectrum resource of an unlicensed spectrum. In this scenario, if the UE reporting the SRS detects that the channel is busy, the UE cannot report the SRS. The UE can continue to detect the state of the channel according to the detection period and report the SRS when detecting that the channel is in an idle state, so that the PUSCH data transmission of the UE is delayed; the UE may also not detect the channel any more subsequently, and thus SRS reporting cannot be performed on the unlicensed spectrum. Specifically, as shown in fig. 1, the method for SRS enhancement in an unlicensed spectrum may include the following steps:

101. and the UE receives the SRS configuration information sent by the base station.

In the embodiment of the present invention, the UE may include various terminals such as a Mobile phone, a tablet computer, a palm computer, a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), an intelligent wearable Device (e.g., a smart watch, a smart bracelet, etc.), and the embodiment of the present invention is not limited thereto.

In the embodiment of the present invention, the SRS configuration information may include, but is not limited to, an identity of the UE, an SRS transmission mode of the UE, and an SRS transmission position of the UE. The SRS transmission mode may refer to a mode in which the UE transmits the SRS to the base station, and the SRS transmission mode may include a frequency division transmission mode, a time division transmission mode, or a code division transmission mode. Different UEs transmit on different subcarriers within a symbol in a frequency division transmission mode, different UEs transmit at different times in a time division transmission mode, and different UEs transmit in different orthogonal codes within a symbol in a code division transmission mode. The SRS transmission patterns of different UEs may be the same or different. The SRS transmission position may refer to which position (or which subcarrier) in a symbol the UE transmits the SRS signal, and the SRS transmission positions of different UEs are different, that is, different UEs transmit their respective SRS signals on different subcarriers in the same symbol.

In the embodiment of the present invention, the base station may configure the SRS configuration information for the UE through a high-level instruction or a Physical Downlink Control Channel (PDCCH) instruction, and Broadcast the SRS configuration information of each UE in the cell by using the cell as a unit through a Broadcast Control Channel (BCCH), and the UE in the cell may receive the SRS configuration information broadcasted by the base station.

In the embodiment of the present invention, the SRS configuration information is used to instruct the UE to report the SRS to the base station in a preset symbol of a preset subframe. In an LTE system, each subframe includes two slots, each slot includes 7 Single-carrier Frequency-Division Multiple Access (SC-FDMA) symbols (hereinafter referred to as symbols for short), and a last symbol (i.e., a 14 th symbol) of each uplink subframe may be used for SRS signal transmission, where the preset symbol may be the last symbol of a preset subframe, and specifically may be the last symbol of the uplink subframe, that is, the base station indicates the UE to transmit SRS on the last symbol of a certain uplink subframe. It should be noted that the special subframe includes an Uplink Pilot Time Slot (UpPTS), where the UpPTS includes two symbols, and both of the two symbols can be used for SRS transmission, and at this Time, the preset symbol may refer to any one of the two symbols, that is, the base station instructs the UE to transmit SRS simultaneously on one symbol in the UpPTS of a special subframe.

In the embodiments of the present invention, LTE defines 2 types of SRS transmission: 1) a periodic SRS, wherein the base station is configured through RRC; 2) for aperiodic SRS, for Frequency Division Duplex (FDD), the base station may trigger the UE to send the aperiodic SRS through Downlink Control Information (DCI) format 0/4/1a in the PDCCH. For Time Division Duplexing (TDD), the base station may trigger the UE to transmit the aperiodic SRS through an SRS request field in DCI format 0/4/1 a/2B/2C. In carrier aggregation, a UE may transmit SRS on different serving cells simultaneously. One UE may configure both periodic SRS and aperiodic SRS on each serving cell. The UE may have different SRS configuration information on different serving cells.

In the embodiment of the invention, in an FDD scene, the subframe of the UE for sending the periodic SRS needs to satisfy the following conditions: (10 x n)_f+k_SRS-T_offset)modT_SRS0; the subframe for sending the aperiodic SRS by the UE needs to satisfy the following conditions: (10 x n)_f+k_SRS-T_offset)modT_SRS0. Wherein n is_fIndicates the system frame number, k_SRSIndicates the subframe number, k ∈ {0, 1.. 9}, T, within each system frame_SRSReporting period, T, of SRS for UE_offsetSRS reported for UE in period T_SRSInner subframe offset. T is_SRSAnd T_offsetThe values are shown in table one and table two:

table one: t reported by aperiodic SRS_offsetAnd T_SRSValue-taking meter

SRS configuration index I_SRS	SRS period T_SRS(ms)	SRS subframe offset T_offset
			0-1	2	I_SRS
2-6	5	I_SRS-2
			7-16	10	I_SRS-7
17-31	reserved	reserved

Table two: t reported by periodic SRS_offsetAnd T_SRSValue-taking meter

SRS configuration index I_SRS	SRS period T_SRS(ms)	SRS subframe offset T_offset
			0-1	2	I_SRS
2-6	5	I_SRS-2
			7-16	10	I_SRS-7
17-36	20	I_SRS-17
			37-76	40	I_SRS-37
77-156	80	I_SRS-77
			157-316	160	I_SRS-157
317-636	320	I_SRS-317
			637-1023	reserved	reserved

It should be noted that an SRS transmitted by one UE in a certain subframe may overlap with PUSCH transmissions of other UEs in a cell in the frequency domain, and in order to avoid collision between SRS transmissions and PUSCH transmissions of different UEs, all UEs should avoid transmitting PUSCH on the last symbol of the subframe in which the SRS is transmitted. Therefore, all UEs in the cell should know which subframe sets there may be UEs transmitting SRS, so that all UEs can avoid transmitting PUSCH on the last symbol of these subframes. Therefore, the SRS configuration information sent by the base station to the UE should also include subframe configuration.

102. And the UE detects whether the target channel is in an idle state on the blank subframe.

In the embodiment of the invention, after receiving the SRS configuration information sent by the base station, the UE firstly measures the LBT mechanism of the target channel on the blank subframe, namely detects whether the target channel is in an idle state. The target channel is a channel occupied by the UE for transmitting the SRS.

In the prior art, the UE reports the SRS on the last symbol of the uplink subframe, and then needs to detect the target channel before reporting the SRS, specifically, detect the target channel before reporting the SRS. If other UEs are currently transmitting PUSCH data using the target channel, the UE may detect that the target channel is busy.

As an exemplary way to detect whether the target channel is in an idle state, specifically, the UE detects whether there are other surrounding devices transmitting PUSCH data on the target channel. If a certain channel of the target is occupied by other equipment, monitoring can be continued when the next monitoring period comes, or monitoring can be stopped according to the indication; if the idle channel resources are monitored, the UE can immediately occupy the target channel. The channel occupation time is a fixed value, which is the time length of the last symbol of the uplink subframe configured by the SRS configuration information, and considering the switching process of the UE reporting the channel detection on the SRS, a silent time can be set before the next channel detection position. Preferably, if it is monitored that the channel resource is idle, a random number L may be generated as a back-off time, and the target channel continues to be monitored in the back-off time, and if it is detected that the target channel is in an idle state for L times, the back-off time is ended, and the UE may occupy the target channel for SRS reporting. If the UE detects that the channel status is non-idle (e.g., occupied by other UEs), the UE may wait until the fixed location of the next period to continue detecting if the device cannot occupy the channel during this period.

As another exemplary way to detect whether the target channel is in the idle state, specifically, when the UE needs to report the SRS, the initial detection is triggered. If the UE initially detects that the target channel is in an idle state, the target channel can be occupied, and a channel occupation time T is configured in advance by the base station; if the UE initially detects that the target channel status is not idle, a deferral period (defer period) time may be generated, and if the target channel is still detected to be busy during the deferral period time, a deferral period time may be continuously generated. The UE can occupy the target channel after detecting that the channel state is idle for L times of detection time, and the time for occupying the target channel is T.

As a possible implementation manner, the blank subframe may be indicated by the SRS configuration information, and the blank subframe is used to indicate that a UE accessing the base station does not perform data transmission on the blank subframe, so that the blank subframe may include a symbol that is previous to a preset symbol (a symbol used for transmitting an SRS) in the preset subframe, specifically, the whole symbol, or a part of the symbol, such as 25 us. Specifically, the base station may indicate the position of the blank subframe in the SRS configuration information when the SRS configuration information of the UE that needs to send the SRS is broadcast, and the UE accessing the base station may not occupy the blank subframe when transmitting PUSCH data. Therefore, the UE can detect the target channel by the LBT mechanism on the blank subframe before sending the SRS.

As another possible implementation, the blank subframe may also be configured by the base station when a UE accessing the base station has a data transmission requirement, where the blank subframe is used to indicate that the UE having the data transmission requirement does not perform data transmission on the blank subframe, and then the blank subframe may include the first M symbols of preset symbols (symbols used for transmitting SRS) in the preset subframe, where M is a positive integer. Specifically, the base station may determine the position of the blank subframe when allocating resources to the UE that has a data transmission demand, so that the UE does not occupy the blank subframe when transmitting PUSCH data. Therefore, the UE can detect the target channel by the LBT mechanism on the blank subframe before sending the SRS.

Further, under a normal Cyclic Prefix (CP), one subframe includes 14 symbols, and if a blank subframe is indicated by the SRS configuration information, the length of the blank subframe is less than or equal to the length of one symbol, i.e., 1/14ms, about 71.4 us; if the blank subframe is configured by the base station under the condition that the UE accessing the base station has data transmission requirement, M is less than or equal to 13, namely the length of the blank subframe is less than or equal to the length of 13 symbols. Specifically, the length of the blank subframe satisfies the condition that sufficient time is reserved for the UE to detect the target channel as far as possible. Under the extended CP, one subframe includes 12 symbols, and if a blank subframe is indicated by SRS configuration information, the length of the blank subframe is less than or equal to the length of one symbol, i.e., 1/12ms, about 83.3 us; if the blank subframe is configured by the base station under the condition that the UE accessing the base station has data transmission requirement, M is less than or equal to 11, namely the length of the blank subframe is less than or equal to the length of 11 symbols. The flexible configuration mode of blank subframes can improve the compatibility of an LTE system on an unlicensed spectrum.

103. And under the condition that the target channel is in an idle state, the UE reports the SRS to the base station at the SRS transmission position according to the SRS transmission mode included by the SRS configuration information.

In the embodiment of the invention, when the UE detects that the target channel is in an idle state on the blank subframe, the UE can report the SRS to the base station at the SRS transmission position according to the SRS transmission mode included by the SRS configuration information, and the base station can carry out channel estimation on the target channel aiming at the SRS reported by the UE. The UE may report the SRS periodically or aperiodically, may report only the SRS on the uplink subframe, or may transmit the PUSCH with other UEs simultaneously on the uplink subframe, and the embodiment of the present invention is not limited.

As a possible implementation manner, when the SRS transmission mode of a UE is a frequency division transmission mode, that is, the pilot sequences of multiple UEs are frequency-divided in a manner that the transmission Comb is N, the SRS transmission position is a frequency domain position, that is, a Comb position corresponding to the UE, where N is a positive integer.

Correspondingly, the specific way for reporting the SRS to the base station by the UE at the SRS transmission position according to the SRS transmission mode included in the SRS configuration information is as follows:

and the UE reports the SRS to the base station at the position of the corresponding Comb according to the transmission mode that the Comb carries out frequency division for the N.

Specifically, the UE may report the SRS to the base station in the last symbol of the uplink subframe through the frequency domain position specified by the base station. In the SRS configuration information sent to the UE by the base station, the frequency domain position of the SRS may be realized by a "wideband SRS" and a "narrowband SRS". For the "narrowband SRS", a plurality of "narrowband SRS" are usually transmitted, frequency hopping is performed in the frequency domain, and the SRS is combined to obtain the frequency band information of interest. Aiming at the condition that 'narrow-band SRS hopping on frequency domain and interested frequency band information is obtained by combining the SRS', the SRS transmits the initial position on the frequency domainThe expression of (a) is:wherein,the length of the reference signal sequence of the SRS is indicated, that is, the frequency domain Resource, also called Resource Block (RB), occupied by the SRS in the frequency domain.May be:

wherein B is B_SRSI.e. bandwidth of SRS, m_SRSRefers to the number of RBs occupied by each SRS in the frequency domain,indicating the number of subcarriers in the resource block, the expression "divide by 2" is due to the SRS's reference signal sequence being mapped every other subcarrier, i.e. a "comb" spectrum.

In a general uplink sub-frame, in the uplink sub-frame, indicates the number of RBs in the uplink subframe,the value can be 0 or 1.

For example, please refer to fig. 2a and fig. 2b together, where fig. 2a is a schematic view of different scenarios of UEs for PUSCH data transmission and SRS reporting in the prior art, and fig. 2b is a schematic view of different scenarios of UEs for PUSCH data transmission and SRS reporting disclosed in the embodiment of the present invention. In the case that multiple UEs (UE1, UE2, UE3, and UE4) multiplex the same symbol in the frequency domain through a Comb structure, and UE1 is configured to report an SRS in the last symbol of an uplink subframe, and the channel is being occupied by UE3 and transmitting PUSCH data, in the prior art, the last symbol of the uplink subframe of the channel is used to report the SRS, and the remaining symbols UE3 are used to transmit PUSCH data, as shown in fig. 2 a; however, in the embodiment of the present invention, part or all of the previous symbol of the uplink subframe of the channel used for reporting the SRS symbol is configured as a blank subframe, and the UE3 can only transmit PUSCH data on the symbol before the blank subframe, as shown in fig. 2 b. In this way, before reporting the SRS, the UE1 can detect that the current channel is in an idle state on a blank subframe, so that the UE1 can report the SRS to the base station on the last symbol of the uplink subframe.

It can be seen that, in the method described in fig. 1, on an unlicensed spectrum, when a UE transmitting PUSCH data in a target channel is inconsistent with a UE reporting an SRS, a part or all of a symbol preceding the symbol reporting the SRS may be configured as a blank subframe, so that a detection result of the UE reporting the SRS on the target channel is idle, and the UE reporting the SRS may report the SRS, thereby solving a problem in the prior art that the SRS reporting is delayed or even impossible to report under the above-mentioned condition.

Referring to fig. 3, fig. 3 is a flowchart illustrating another SRS enhancement method in an unlicensed spectrum according to an embodiment of the present invention. The method shown in fig. 3 may be applied to a scenario where different UEs for PUSCH data transmission and SRS reporting exist in a certain spectrum resource of an unlicensed spectrum. In this scenario, if the UE reporting the SRS detects that the channel is busy, the UE cannot report the SRS. The UE can continue to detect the state of the channel according to the detection period and report the SRS when detecting that the channel is in an idle state, so that the PUSCH data transmission of the UE is delayed; the UE may also not detect the channel any more subsequently, and thus SRS reporting cannot be performed on the unlicensed spectrum. Specifically, as shown in fig. 3, the method for SRS enhancement in an unlicensed spectrum may include the following steps:

301. the base station transmits the SRS configuration information.

In the embodiment of the present invention, the SRS configuration information may include, but is not limited to, an identity of the UE, an SRS transmission mode of the UE, and an SRS transmission position of the UE. The SRS configuration information is used to instruct the UE to report the SRS to the base station in a preset symbol of a preset subframe. In the LTE system, each subframe includes two slots, each slot includes 7 symbols, and a last symbol (i.e., 14 th symbol) of each uplink subframe may be used for SRS signal transmission, where the preset symbol may refer to the last symbol of the preset subframe, and specifically may be the last symbol of the uplink subframe, that is, the base station instructs the UE to transmit an SRS signal on the last symbol of a certain uplink subframe. It should be noted that the special subframe includes one UpPTS, where the UpPTS includes two symbols, and both of the two symbols can be used for SRS transmission, and at this time, the preset symbol may refer to any one of the two symbols, that is, the base station instructs the UE to transmit SRS on one symbol in the UpPTS of a special subframe at the same time.

In the embodiment of the invention, the base station can configure the SRS configuration information for the UE through a high-level instruction or a PDCCH instruction, and broadcasts the SRS configuration information of each UE in the cell by taking the cell as a unit through the BCCH, and the UE in the cell can receive the SRS configuration information broadcasted by the base station.

302. And the base station receives the SRS reported on the SRS transmission position by the UE according to the SRS transmission mode included by the SRS configuration information under the condition that the UE detects that the target channel is in an idle state on the blank subframe.

In the embodiment of the invention, after identifying the corresponding SRS configuration information according to the identification, the UE firstly detects whether the target channel is in an idle state on a blank subframe, and if the target channel is in the idle state, the UE reports the SRS to the base station according to the configuration information.

Further, under normal CP, one subframe includes 14 symbols, and if a blank subframe is indicated by SRS configuration information, the length of the blank subframe is less than or equal to the length of one symbol, i.e., 1/14ms, about 71.4 us; if the blank subframe is configured by the base station under the condition that the UE accessing the base station has data transmission requirement, M is less than or equal to 13, namely the length of the blank subframe is less than or equal to the length of 13 symbols. Specifically, the length of the blank subframe satisfies the condition that sufficient time is reserved for the UE to detect the target channel as far as possible. Under the extended CP, one subframe includes 12 symbols, and if a blank subframe is indicated by SRS configuration information, the length of the blank subframe is less than or equal to the length of one symbol, i.e., 1/12ms, about 83.3 us; if the blank subframe is configured by the base station under the condition that the UE accessing the base station has data transmission requirement, M is less than or equal to 11, namely the length of the blank subframe is less than or equal to the length of 11 symbols. The flexible configuration mode of blank subframes can improve the compatibility of an LTE system on an unlicensed spectrum.

As a possible implementation manner, when the SRS configuration information includes an SRS transmission mode and an SRS transmission position of the UE, if the SRS transmission mode of the UE is a frequency division transmission mode, that is, a pilot sequence of a plurality of UEs is frequency-divided according to a Comb being N, the SRS transmission position is a frequency domain position, that is, a Comb position corresponding to the UE, where N is a positive integer.

Correspondingly, the specific way for the base station to receive the SRS reported by the UE at the SRS transmission position according to the SRS transmission mode included in the SRS configuration information when the UE detects that the target channel is in the idle state on the blank subframe is as follows:

and the base station receives the SRS reported by the UE at the position of the corresponding Comb in a transmission mode of frequency division according to the Comb as N under the condition that the UE detects that the target channel is in an idle state on the blank subframe.

303. And the base station carries out channel estimation on the target channel according to the SRS.

In the embodiment of the invention, as for the SRS reported by the UE and received by the base station, the SRS can be subjected to channel estimation by using a preset algorithm, namely, the target channel of the SRS transmitted by the UE is subjected to channel estimation. The preset algorithm may be different according to different SRS transmission modes, and when the SRS transmission mode is a frequency division transmission mode, the preset algorithm may be a compressed sensing algorithm; when the SRS transmission mode is a code division transmission mode, the predetermined algorithm may be a conventional code division channel estimation algorithm, such as time domain filtering.

It can be seen that, in the method described in fig. 3, on an unlicensed spectrum, when the UE transmitting PUSCH data in a target channel is inconsistent with the UE reporting an SRS, a part or all of a symbol preceding the symbol reporting the SRS may be configured as a blank subframe, so that a detection result of the UE reporting the SRS on the target channel is idle, and the UE reporting the SRS may report the SRS, thereby solving a problem in the prior art that the SRS reporting is delayed or even impossible to report under the above-mentioned condition.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a UE according to an embodiment of the present invention, configured to execute a method for SRS enhancement in an unlicensed spectrum according to the embodiment of the present invention. As shown in fig. 4, the UE400 may include:

a receiving unit 401, configured to receive SRS configuration information sent by a base station, where the SRS configuration information is used to instruct the UE400 to report an SRS to the base station in a preset symbol of a preset subframe.

In the embodiment of the present invention, the SRS configuration information may include, but is not limited to, an identity of the UE400, an SRS transmission mode of the UE400, and an SRS transmission position of the UE 400.

A detecting unit 402, configured to detect whether the target channel is in an idle state on a blank subframe.

As an exemplary way to detect whether the target channel is in the idle state, specifically, the UE400 detects whether there are other devices around to transmit PUSCH data on the target channel. If a certain channel of the target is occupied by other equipment, monitoring can be continued when the next monitoring period comes, or monitoring can be stopped according to the indication; if it is monitored that the channel resources are free, the UE400 may immediately occupy the target channel. The channel occupation time is a fixed value, which is the time length of the last symbol of the uplink subframe configured by the SRS configuration information, and considering that the UE400 reports the switching process of the channel detection on the SRS, a silent time may be set before the next channel detection position. Preferably, if it is monitored that the channel resource is idle, a random number L may be generated as a back-off time, and the target channel continues to be monitored in the back-off time, and if it is detected that the target channel is in an idle state for L times, the back-off time is ended, and the UE400 may occupy the target channel for SRS reporting. If the UE400 detects that the channel status is non-idle (e.g., occupied by other UEs), the device cannot occupy the channel during this period, and the UE400 may wait until the fixed location of the next period to continue the detection.

As another exemplary way to detect whether the target channel is in the idle state, specifically, when the UE400 needs to report the SRS, the initial detection is triggered. If the UE400 initially detects that the target channel is in an idle state, the target channel may be occupied, and the base station configures a channel occupation time T in advance; if the UE400 initially detects that the target channel status is not idle, a deferral period (defer period) time may be generated, and if the target channel is still detected to be busy during the deferral period time, a deferral period time may continue to be generated. The UE400 may occupy the target channel after detecting that the channel state is idle for L times of detection, and the time for occupying the target channel is T.

A sending unit 403, configured to report, when the target channel is in an idle state, the SRS to the base station at the SRS transmission position according to the SRS transmission mode, so that the base station performs channel estimation on the target channel according to the reported SRS.

As a possible implementation manner, the blank subframe may be indicated by the SRS configuration information, and the blank subframe is used to indicate that a UE accessing the base station does not perform data transmission on the blank subframe, so that the blank subframe may include a symbol that is previous to a preset symbol (a symbol used for transmitting an SRS) in the preset subframe, specifically, the whole symbol, or a part of the symbol, such as 25 us. Specifically, the base station may indicate the position of the blank subframe in the SRS configuration information when broadcasting the SRS configuration information of the UE400, and the UE accessing the base station may not occupy the blank subframe when transmitting PUSCH data. Thus, the UE400 can perform the detection of the LBT mechanism on the target channel in the blank subframe before transmitting the SRS.

As another possible implementation, the blank subframe may also be configured by the base station when a UE accessing the base station has a data transmission requirement, where the blank subframe is used to indicate that the UE having the data transmission requirement does not perform data transmission on the blank subframe, and then the blank subframe may include the first M symbols of preset symbols (symbols used for transmitting SRS) in the preset subframe, where M is a positive integer. Specifically, the base station may determine the position of the blank subframe when allocating resources to the UE that has a data transmission demand, so that the UE does not occupy the blank subframe when transmitting PUSCH data. Thus, the UE400 can perform the detection of the LBT mechanism on the target channel in the blank subframe before transmitting the SRS.

Further, under normal CP, one subframe includes 14 symbols, and if a blank subframe is indicated by SRS configuration information, the length of the blank subframe is less than or equal to the length of one symbol, i.e., 1/14ms, about 71.4 us; if the blank subframe is configured by the base station under the condition that the UE accessing the base station has data transmission requirement, M is less than or equal to 13, namely the length of the blank subframe is less than or equal to the length of 13 symbols. Specifically, the length of the blank subframe is as long as possible to reserve sufficient time for the UE400 to detect the target channel. Under the extended CP, one subframe includes 12 symbols, and if a blank subframe is indicated by SRS configuration information, the length of the blank subframe is less than or equal to the length of one symbol, i.e., 1/12ms, about 83.3 us; if the blank subframe is configured by the base station under the condition that the UE accessing the base station has data transmission requirement, M is less than or equal to 11, namely the length of the blank subframe is less than or equal to the length of 11 symbols. The flexible configuration mode of blank subframes can improve the compatibility of an LTE system on an unlicensed spectrum.

As another possible implementation, when the SRS transmission mode of the UE400 is a frequency division transmission mode, that is, the pilot sequences of multiple UEs are frequency-divided according to the Comb being N, the SRS transmission position is a frequency domain position, that is, the Comb position corresponding to the UE400, where N is a positive integer.

Correspondingly, the specific way for reporting the SRS to the base station at the SRS transmission position by the sending unit 403 according to the SRS transmission mode is as follows:

and reporting the SRS to the base station at the position of the corresponding Comb according to the transmission mode that the Comb carries out frequency division for N.

It can be seen that, in the UE described in fig. 4, on an unlicensed spectrum, when the UE transmitting PUSCH data in a target channel is inconsistent with the UE reporting an SRS, a part or all of a symbol before the symbol reporting the SRS may be configured as a blank subframe, so that a detection result of the UE reporting the SRS on the target channel is idle, and the UE reporting the SRS may report the SRS, thereby solving a problem in the prior art that the SRS reporting is delayed or even impossible to report under the above-mentioned condition.

Referring to fig. 5, fig. 5 is a schematic structural diagram of another UE disclosed in the embodiment of the present invention, configured to execute a method for SRS enhancement in an unlicensed spectrum disclosed in the embodiment of the present invention. As shown in fig. 5, the UE500 may include: at least one processor 501, such as a CPU (Central Processing Unit), at least one receiver 502, at least one transmitter 503, a memory 504, and the like. Wherein the components are communicatively coupled via one or more buses 505. Those skilled in the art will appreciate that the structure of the UE500 shown in fig. 5 is not limited to the embodiments of the present invention, and may be a bus structure, a star structure, a structure including more or less components than those shown, a combination of some components, or a different arrangement of components. Wherein:

in this embodiment of the present invention, the receiver 502 may include a wired interface, a wireless interface, and the like, and may be configured to receive a signal transmitted by a base station in a downlink direction. The transmitter 503 may include a wired interface, a wireless interface, etc., and may be used to transmit signals upstream to a base station, etc.

In the embodiment of the present invention, the memory 504 may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 504 may optionally be at least one storage device located remotely from the processor 501. As shown in fig. 5, the memory 504 may include an operating system, an application program, data, and the like, and the embodiment of the present invention is not limited thereto.

In the UE500 shown in fig. 5, the processor 501 may be configured to invoke an application program stored in the memory 504 to perform the following operations:

the trigger receiver 502 receives SRS configuration information sent by a base station, where the SRS configuration information is used to instruct the UE500 to report an SRS to the base station in a preset symbol of a preset subframe.

And detecting whether the target channel is in an idle state on the blank subframe.

When the target channel is in an idle state, the trigger transmitter 503 reports the SRS to the base station at the SRS transmission position according to the SRS transmission mode, so that the base station performs channel estimation on the target channel according to the reported SRS.

In the embodiment of the present invention, the SRS configuration information may include, but is not limited to, an identity of the UE500, an SRS transmission mode of the UE500, and an SRS transmission position of the UE 500.

As a possible implementation manner, the blank subframe may be indicated by the SRS configuration information, and the blank subframe is used to indicate that a UE accessing the base station does not perform data transmission on the blank subframe, so that the blank subframe may include a symbol that is previous to a preset symbol (a symbol used for transmitting an SRS) in the preset subframe, specifically, the whole symbol, or a part of the symbol, such as 25 us. Specifically, the base station may indicate the position of the blank subframe in the SRS configuration information when broadcasting the SRS configuration information of the UE500, and the UE accessing the base station may not occupy the blank subframe when transmitting PUSCH data. Thus, the UE500 may perform the LBT mechanism detection on the target channel on the blank subframe before transmitting the SRS.

As another possible implementation, the blank subframe may also be configured by the base station when a UE accessing the base station has a data transmission requirement, where the blank subframe is used to indicate that the UE having the data transmission requirement does not perform data transmission on the blank subframe, and then the blank subframe may include the first M symbols of preset symbols (symbols used for transmitting SRS) in the preset subframe, where M is a positive integer. Specifically, the base station may determine the position of the blank subframe when allocating resources to the UE that has a data transmission demand, so that the UE does not occupy the blank subframe when transmitting PUSCH data. Thus, the UE500 may perform the LBT mechanism detection on the target channel on the blank subframe before transmitting the SRS.

Further, under normal CP, one subframe includes 14 symbols, and if a blank subframe is indicated by SRS configuration information, the length of the blank subframe is less than or equal to the length of one symbol, i.e., 1/14ms, about 71.4 us; if the blank subframe is configured by the base station under the condition that the UE accessing the base station has data transmission requirement, M is less than or equal to 13, namely the length of the blank subframe is less than or equal to the length of 13 symbols. Specifically, the length of the blank subframe is as long as possible to reserve sufficient time for the UE500 to detect the target channel. Under the extended CP, one subframe includes 12 symbols, and if a blank subframe is indicated by SRS configuration information, the length of the blank subframe is less than or equal to the length of one symbol, i.e., 1/12ms, about 83.3 us; if the blank subframe is configured by the base station under the condition that the UE accessing the base station has data transmission requirement, M is less than or equal to 11, namely the length of the blank subframe is less than or equal to the length of 11 symbols. The flexible configuration mode of blank subframes can improve the compatibility of an LTE system on an unlicensed spectrum.

As another possible implementation, when the SRS transmission mode of the UE500 is a frequency division transmission mode, that is, the pilot sequences of multiple UEs are frequency-divided according to the Comb being N, the SRS transmission position is a frequency domain position, that is, the Comb position corresponding to the UE500, where N is a positive integer.

Correspondingly, the specific way for the processor 501 to trigger the transmitter 503 to report the SRS to the base station at the SRS transmission position according to the SRS transmission mode is as follows:

It can be seen that, in the UE described in fig. 5, on an unlicensed spectrum, when the UE transmitting PUSCH data in a target channel is inconsistent with the UE reporting an SRS, a part or all of a symbol before the symbol reporting the SRS may be configured as a blank subframe, so that a detection result of the UE reporting the SRS on the target channel is idle, and the UE reporting the SRS may report the SRS, thereby solving a problem in the prior art that the SRS reporting is delayed or even impossible to report under the above-mentioned condition.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention, configured to execute a method for SRS enhancement in an unlicensed spectrum according to the embodiment of the present invention. As shown in fig. 6, the base station 600 may include:

a sending unit 601, configured to send SRS configuration information, where the SRS configuration information is used to instruct a UE accessing to the base station 600 to report an SRS to the base station 600 in a preset symbol of a preset subframe.

A receiving unit 602, configured to receive an SRS reported at an SRS transmission position according to an SRS transmission mode when the UE detects that the target channel is in an idle state on the blank subframe.

A channel estimation unit 603, configured to perform channel estimation on a target channel according to the SRS reported by the UE.

In the embodiment of the present invention, the SRS configuration information may include, but is not limited to, an identity of the UE, an SRS transmission mode of the UE, and an SRS transmission position of the UE.

As a possible implementation manner, the blank subframe may be indicated by the SRS configuration information, and the blank subframe is used to indicate that a UE accessing the base station 600 does not perform data transmission on the blank subframe, and then the blank subframe may include a symbol that is previous to a preset symbol (a symbol used for transmitting an SRS) in the preset subframe, specifically, the whole symbol, or a part of the symbol, such as 25 us. Specifically, the base station 600 may indicate a position of a blank subframe in the SRS configuration information when the SRS configuration information of the UE that needs to send the SRS is broadcasted, and the UE accessing the base station 600 does not occupy the blank subframe when transmitting PUSCH data. Therefore, the UE needing to transmit the SRS can detect the LBT mechanism on the target channel on the blank subframe before transmitting the SRS.

As another possible implementation, the blank subframe may also be configured by the base station 600 when the UE accessing the base station 600 has a data transmission requirement, where the blank subframe is used to indicate that the UE having the data transmission requirement does not perform data transmission on the blank subframe, and then the blank subframe may include the first M symbols of preset symbols (symbols used for transmitting SRS) in the preset subframe, where M is a positive integer. Specifically, the base station 600 may determine the position of the blank subframe when allocating resources to the UE that has a data transmission requirement, so that the UE does not occupy the blank subframe when transmitting the PUSCH data. Therefore, the UE needing to transmit the SRS can detect the LBT mechanism on the target channel on the blank subframe before transmitting the SRS.

As another possible implementation, when the SRS transmission mode of a UE is a frequency division transmission mode, that is, the pilot sequences of multiple UEs are frequency-divided according to the Comb being N, the SRS transmission position is a frequency domain position, that is, the Comb position corresponding to the UE, where N is a positive integer.

Correspondingly, the specific way for the receiving unit 602 to receive the SRS reported by the UE at the SRS transmission position according to the SRS transmission mode when the UE detects that the target channel is in the idle state on the blank subframe is as follows:

and receiving the SRS reported by the UE at the corresponding Comb position in a frequency division transmission mode according to the Comb as N under the condition that the UE detects that the target channel is in an idle state on the blank subframe.

It can be seen that, in the base station described in fig. 6, on an unlicensed spectrum, when the UE transmitting PUSCH data in a target channel is inconsistent with the UE reporting an SRS, a part or all of a symbol before the symbol reporting the SRS may be configured as a blank subframe, so that a detection result of the UE reporting the SRS on the target channel is idle, and the UE reporting the SRS may report the SRS, thereby solving a problem in the prior art that the SRS reporting is delayed or even impossible to report under the above-mentioned condition.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another base station disclosed in the embodiment of the present invention, configured to perform the method for DMRS enhancement disclosed in the embodiment of the present invention. As shown in fig. 7, the base station 700 may include: at least one processor 701, such as a CPU (Central Processing Unit), at least one receiver 702, at least one transmitter 703, a memory 704, etc. Wherein the components are communicatively coupled via one or more buses 705. Those skilled in the art will appreciate that the configuration of the base station 700 shown in fig. 7 is not intended to limit embodiments of the present invention, and may be a bus configuration, a star configuration, a combination of more or fewer components than those shown, or a different arrangement of components. Wherein:

in this embodiment of the present invention, the receiver 702 may include a wired interface, a wireless interface, and the like, and may be configured to receive a signal transmitted by the UE in uplink. The transmitter 703 may include a wired interface, a wireless interface, etc., and may be used to transmit signals downlink to the UE, etc.

In the embodiment of the present invention, the memory 704 may be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 704 may alternatively be at least one memory device located remotely from the processor 701. As shown in fig. 7, the memory 704 may include applications, data, and the like, and the embodiment of the present invention is not limited thereto.

In the base station 700 shown in fig. 7, the processor 701 may be configured to invoke an application program stored in the memory 704 to perform the following operations:

the trigger transmitter 703 transmits SRS configuration information, where the SRS configuration information is used to instruct a UE accessing the base station 600 to report an SRS to the base station 600 in a preset symbol of a preset subframe.

The trigger receiver 702 receives the SRS reported at the SRS transmission position according to the SRS transmission mode when the UE detects that the target channel is in the idle state on the blank subframe.

And performing channel estimation on the target channel according to the SRS reported by the UE.

In this embodiment of the present invention, the blank subframe may include a symbol before a preset symbol (i.e., a symbol used for transmitting an SRS) in the preset subframe, specifically, a part of the symbol, or all of the symbols.

As a possible implementation manner, the blank subframe may be indicated by the SRS configuration information, and the blank subframe is used to indicate that a UE accessing the base station 700 does not perform data transmission on the blank subframe, and then the blank subframe may include a symbol that is previous to a preset symbol (a symbol used for transmitting an SRS) in the preset subframe, specifically, the whole symbol, or a part of the symbol, such as 25 us. Specifically, the base station 700 may indicate a position of a blank subframe in the SRS configuration information when the SRS configuration information of the UE that needs to send the SRS is broadcasted, and the UE accessing the base station 700 does not occupy the blank subframe when transmitting PUSCH data. Therefore, the UE needing to transmit the SRS can detect the LBT mechanism on the target channel on the blank subframe before transmitting the SRS.

As another possible implementation, the blank subframe may also be configured by the base station 700 when a UE accessing the base station 700 has a data transmission requirement, where the blank subframe is used to indicate that the UE having the data transmission requirement does not perform data transmission on the blank subframe, and then the blank subframe may include the first M symbols of preset symbols (symbols used for transmitting SRS) in the preset subframe, where M is a positive integer. Specifically, the base station 700 may determine the position of the blank subframe when allocating resources to the UE that has a data transmission requirement, so that the UE does not occupy the blank subframe when transmitting the PUSCH data. Therefore, the UE needing to transmit the SRS can detect the LBT mechanism on the target channel on the blank subframe before transmitting the SRS.

As a possible implementation manner, when the SRS transmission mode of the UE is a frequency division transmission mode, that is, the pilot sequences of the UEs are frequency-divided according to the Comb being N, the SRS transmission position is a frequency domain position, that is, the Comb position corresponding to the UE, where N is a positive integer.

Correspondingly, the specific way for triggering the receiver 702 to receive the SRS reported by the UE at the SRS transmission position according to the SRS transmission mode when the UE detects that the target channel is in the idle state on the blank subframe is as follows:

It can be seen that, in the base station described in fig. 7, on an unlicensed spectrum, when the UE transmitting PUSCH data in a target channel is inconsistent with the UE reporting SRS, a part or all of a symbol before the symbol reporting SRS may be configured as a blank subframe, so that a detection result of the UE reporting SRS on the target channel is idle, and then the UE reporting SRS may report the SRS, thereby solving a problem that the SRS cannot be reported in the above-mentioned situation in the prior art, and improving data transmission efficiency of the UE.

The elements of all embodiments of the present invention may be implemented by a general-purpose Integrated Circuit such as a CPU, or by an ASIC (Application Specific Integrated Circuit).

It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.

The units in the base station or the UE in the embodiment of the invention can be merged, divided and deleted according to actual needs.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.

The method for enhancing the sounding reference signal under the unlicensed spectrum and the related device provided by the embodiment of the present invention are introduced in detail above, and a specific example is applied in the text to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method for Sounding Reference Signal (SRS) enhancement in an unlicensed spectrum, the method comprising:

2. The method of claim 1, wherein the preset symbol is a last symbol of the preset subframe;

the blank subframe is indicated by the SRS configuration information, the blank subframe is used for indicating that UE accessed to the base station does not perform data transmission on the blank subframe, and the blank subframe comprises a symbol before the preset symbol in the preset subframe; or the blank subframe is configured by the base station under the condition that the UE accessed to the base station has a data transmission requirement, the blank subframe is used for indicating that the UE with the data transmission requirement does not perform data transmission on the blank subframe, the blank subframe comprises the first M symbols of the preset symbols in the preset subframe, and M is a positive integer.

3. The method of claim 2, wherein under a normal Cyclic Prefix (CP), if the blank subframe is indicated by the SRS configuration information, the length of the blank subframe is less than or equal to 1/14ms, and if the blank subframe is configured by the base station with data transmission requirements of a UE accessing the base station, the M is less than or equal to 13;

under extended CP, if the blank subframe is indicated by the SRS configuration information, the length of the blank subframe is less than or equal to 1/12ms, and if the blank subframe is configured by the base station under the condition that a UE accessing the base station has data transmission requirement, the M is less than or equal to 11.

4. The method according to any one of claims 1 to 3, wherein when the SRS transmission mode of the UE is a transmission mode in which SRS pilot sequences of a plurality of UEs are frequency-divided in a manner that a transmission Comb is N, the SRS transmission position of the UE is a Comb position corresponding to the UE, and N is a positive integer;

reporting, by the UE, the SRS to the base station at the SRS transmission position according to the SRS transmission mode, including:

and the UE reports the SRS to the base station at the corresponding Comb position according to the transmission mode that the Comb carries out frequency division for N.

5. A method for SRS enhancement in unlicensed spectrum, the method comprising:

the base station receives the SRS reported on the SRS transmission position according to the SRS transmission mode under the condition that the UE detects that a target channel is in an idle state on a blank subframe, wherein the target channel is positioned in an unauthorized frequency spectrum;

6. The method of claim 5, wherein the preset symbol is a last symbol of the preset subframe;

7. The method of claim 6, wherein under a normal Cyclic Prefix (CP), if the blank subframe is indicated by the SRS configuration information, the length of the blank subframe is less than or equal to 1/14ms, and if the blank subframe is configured by the base station with data transmission requirements of a UE accessing the base station, the M is less than or equal to 13;

8. The method according to any one of claims 5 to 7, wherein when the SRS transmission mode of the UE is a transmission mode in which SRS pilot sequences of a plurality of UEs are frequency-divided in a manner that a transmission Comb is N, the SRS transmission position of the UE is the Comb position corresponding to the UE, and N is a positive integer;

the base station receives the SRS reported on the SRS transmission position according to the SRS transmission mode under the condition that the UE detects that a target channel is in an idle state on a blank subframe, and the method comprises the following steps:

and the base station receives the SRS reported on the corresponding Comb position in a transmission mode of frequency division according to the Comb as N under the condition that the UE detects that the target channel is in an idle state on the blank subframe.

9. A UE, wherein the UE comprises:

10. The UE of claim 9, wherein the preset symbol is a last symbol of the preset subframe;

11. The UE of claim 10, wherein under a normal Cyclic Prefix (CP), if the blank subframe is indicated by the SRS configuration information, the length of the blank subframe is less than or equal to 1/14ms, and if the blank subframe is configured by the base station with data transmission requirements of a UE accessing the base station, the M is less than or equal to 13;

12. The UE according to any of claims 9 to 11, wherein when the SRS transmission mode of the UE is a transmission mode in which SRS pilot sequences of a plurality of UEs are frequency-divided in a manner that a transmission Comb is N, the SRS transmission position of the UE is a Comb position corresponding to the UE, and N is a positive integer;

the specific way for reporting the SRS to the base station by the sending unit at the SRS transmission position according to the SRS transmission mode is as follows:

and reporting the SRS signal to the base station at the corresponding Comb position according to the transmission mode that the Comb carries out frequency division for N.

13. A base station, characterized in that the base station comprises:

14. The base station of claim 13, wherein the predetermined symbol is a last symbol of the predetermined subframe;

15. The base station of claim 14, wherein under a normal Cyclic Prefix (CP), if the blank subframe is indicated by the SRS configuration information, the length of the blank subframe is less than or equal to 1/14ms, and if the blank subframe is configured by the base station with data transmission requirement of a UE accessing the base station, the M is less than or equal to 13;

16. The base station according to any of claims 13 to 15, wherein when the SRS transmission mode of the UE is a transmission mode in which SRS pilot sequences of a plurality of UEs are frequency-divided according to a transmission Comb N, the SRS transmission position of the UE is a Comb position corresponding to the UE, and N is a positive integer;

the receiving unit receives the SRS reported by the UE at the SRS transmission position according to the SRS transmission mode when detecting that the target channel is in an idle state on a blank subframe, including:

and receiving the SRS reported by the UE at the corresponding Comb position in a transmission mode of frequency division according to the Comb as N under the condition that the UE detects that the target channel is in an idle state on the blank subframe.