CN107926023B

CN107926023B - Communication method and network device

Info

Publication number: CN107926023B
Application number: CN201580081961.2A
Authority: CN
Inventors: 贺传峰; 曲秉玉; 权威; 邵家枫; 苗金华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2015-07-27
Filing date: 2015-07-27
Publication date: 2020-12-01
Anticipated expiration: 2035-07-27
Also published as: WO2017015813A1; CN107926023A

Abstract

The embodiment of the invention provides a communication method and network equipment, wherein the method comprises the following steps: the first network equipment transmits a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS) in one time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS are overlapped. In the communication method and the network device of the embodiment of the invention, the first network device transmits both the DMRS and the SRS in a time unit, and the frequency domain resource of the DMRS and the frequency domain resource of the SRS are overlapped, so that the second network device can perform channel estimation on the time unit according to the DMRS and the SRS in the time unit, and can realize frequency offset estimation in the time unit. When the method is applied to a short TTI scene, the frequency offset estimation under the short TTI condition can be realized.

Description

Communication method and network device

Technical Field

The present invention relates to the field of communications, and in particular, to a communication method and a network device.

Background

In a Long Term Evolution (LTE) system, the length of a subframe is 1 ms. The length of a Transmission Time Interval (TTI) scheduled by a Physical Uplink Shared Channel (PUSCH) and a Physical Downlink Shared Channel (PDSCH) is 1 ms. In order to reduce the delay of the system and meet the requirement of low-delay service, the TTI length may be shortened in the physical layer, for example, the TTI length of 0.5ms is used to carry user data, i.e., the TTI length scheduled by the PUSCH and the PDSCH is 0.5ms, so as to shorten the Round-Trip Time (RTT) and implement shorter data transmission delay of the physical layer.

In the frame structure of the PUSCH of a 1ms TTI, the 1ms TTI contains two 0.5ms slots, each of which transmits a demodulation Reference Signal (DMRS) with one symbol. And the base station demodulates the uplink data transmitted by User Equipment (UE) according to the DMRS. In addition, the base station can perform channel estimation on the TTI better through the DMRSs of the two time slots in the TTI, and particularly can perform frequency offset estimation on the TTI through the two DMRSs in the TTI so as to correct uplink frequency offset. However, when the short TTIs such as 0.5ms TTI are used for PUSCH transmission, only one slot is used for transmitting PUSCH in one TTI, that is, only one DMRS is used in one TTI, the channel estimation effect is poor, and frequency offset estimation cannot be achieved.

Disclosure of Invention

The embodiment of the invention provides a communication method and network equipment, which can better realize channel estimation under the condition of short TTI (transmission time interval), and particularly realize frequency offset estimation under the condition of short TTI.

In a first aspect, a communication method is provided, the method including:

the method includes the steps that a first network device transmits a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS) in one time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS are overlapped.

With reference to the first aspect, in an implementation manner of the first aspect, a physical uplink shared channel, PUSCH, is scheduled on a time domain resource corresponding to the time unit, the PUSCH is transmitted with a DMRS, and an SRS configured by the second network device is transmitted on a time domain resource corresponding to the time unit.

With reference to the first aspect or any one of the above-mentioned respective implementations, in another implementation of the first aspect, before the first network device transmits a demodulation reference signal, DMRS, and a sounding reference signal, SRS, over one time unit, the method further includes:

the first network device determines a first SRS parameter, where the first SRS parameter is used to indicate a parameter used by the first network device to transmit an SRS in the time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH that can be scheduled by the second network device for the first network device.

the first network device determines the time unit in which to transmit the SRS in which the DMRS and frequency domain resources overlap with the DMRS.

With reference to the first aspect or any one of the above corresponding implementations of the first aspect, in another implementation of the first aspect, the determining, by the first network device, a first SRS parameter includes:

the first network device receives first indication information sent by the second network device, wherein the first indication information is used for indicating the first SRS parameter;

and the first network equipment determines the first SRS parameter according to the first indication information.

With reference to the first aspect or any one of the above corresponding implementation manners of the first aspect, in another implementation manner of the first aspect, the receiving, by the first network device, the first indication information sent by the second network device includes:

the first network device receives the first indication information sent by the second network device through a Physical Downlink Control Channel (PDCCH), and the PDCCH also comprises information of a Physical Uplink Shared Channel (PUSCH) scheduled by the second network device for the first network device.

With reference to the first aspect or any one of the above-described corresponding implementations of the first aspect, in another implementation of the first aspect, the plurality of sets of SRS parameters are configured in the first network device,

the first network device determining first SRS parameters, comprising:

and the first network equipment selects the first SRS parameter from the plurality of sets of SRS parameters according to the frequency domain of the PUSCH scheduled by the second network equipment for the first network equipment.

With reference to the first aspect or any one of the above-mentioned corresponding implementations, in another implementation of the first aspect, the determining, by the first network device, the time unit for transmitting the SRS whose DMRS and frequency domain resources overlap with the DMRS includes:

the first network device determines the time unit according to a period of sending the SRS when the second network device performs short TTI transmission configured for the first network device by the second network device, or according to second indication information of sending the SRS according to an indication sent by the second network device, and a PUSCH is scheduled on a time domain resource corresponding to the time unit, and the SRS configured for the second network device is sent on the time domain resource corresponding to the time unit.

With reference to the first aspect or any one of the above-mentioned corresponding implementation manners of the first aspect, in another implementation manner of the first aspect, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

With reference to the first aspect or any one of the above-mentioned corresponding implementation manners of the first aspect, in another implementation manner of the first aspect, the time unit is one TTI, one slot, or one subframe.

In a second aspect, a communication method is provided, the method comprising:

the method includes that a first network device transmits an additional DMRS on a first time unit according to a period, configured for the first network device by a second network device, of transmitting the additional DMRS, or the first network device transmits additional DMRS on the first time unit according to third indication information received from the second network device, wherein the third indication information is used for indicating the first network device to transmit the additional DMRS on the first time unit, and another DMRS exists on the first time unit.

With reference to the second aspect, in an implementation manner of the second aspect, the third indication information is received by the first network device from the second network device through a physical downlink control channel PDCCH, and the PDCCH further includes information of a physical uplink shared channel PUSCH scheduled by the second network device for the first network device.

With reference to the second aspect or any one of the foregoing corresponding implementation manners of the second aspect, in another implementation manner of the second aspect, no sounding reference signal, SRS, configured by the second network device is transmitted on a time domain resource corresponding to the first time unit.

With reference to the second aspect or any one of the above-described respective implementations thereof, in another implementation of the second aspect, the method further includes:

the first network device transmits a DMRS and an SRS over a second time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS overlap.

With reference to the second aspect or any one of the foregoing corresponding implementation manners of the second aspect, in another implementation manner of the second aspect, a physical uplink shared channel, PUSCH, is scheduled on a time domain resource corresponding to the second time unit, the DMRS is transmitted on the PUSCH, and an SRS configured by the second network device is transmitted on a time domain resource corresponding to the second time unit.

With reference to the second aspect or any one of the above-described respective implementations thereof, in another implementation of the second aspect, before the first network device transmits the DMRS and SRS on the second time unit, the method further includes:

the first network device determines a first SRS parameter, where the first SRS parameter is used to indicate a parameter used by the first network device to transmit an SRS in the second time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH which can be scheduled by the second network device for the first network device.

the first network device determines the second time unit to transmit the SRS with the DMRS and frequency domain resources overlapping with the DMRS.

With reference to the second aspect or any one of the above corresponding implementations of the second aspect, in another implementation of the second aspect, the determining, by the first network device, a first SRS parameter includes:

With reference to the second aspect or any one of the above corresponding implementation manners of the second aspect, in another implementation manner of the second aspect, the receiving, by the first network device, the first indication information sent by the second network device includes:

With reference to the second aspect or any one of the above corresponding implementations, in another implementation of the second aspect, the plurality of sets of SRS parameters are configured in the first network device,

the first network device determining first SRS parameters, comprising:

With reference to the second aspect or any one of the above-mentioned respective implementations, in another implementation of the second aspect, the determining, by the first network device, the second time unit for transmitting the SRS whose DMRS and frequency domain resources overlap with the DMRS includes:

the first network device determines the second time unit according to a period, configured for the first network device by the second network device, of sending the SRS, or according to second indication information, sent by the second network device, of sending the SRS, where the time domain resource corresponding to the second time unit is scheduled with a PUSCH, and the time domain resource corresponding to the second time unit is sent by the SRS configured by the second network device.

With reference to the second aspect or any one of the above corresponding implementations, in another implementation of the second aspect, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

With reference to the second aspect or any one of the above corresponding implementations of the second aspect, in another implementation of the second aspect, the first time unit is one TTI, one slot, or one subframe.

With reference to the second aspect or any one of the above corresponding implementations of the second aspect, in another implementation of the second aspect, the second time unit is one TTI, one slot, or one subframe.

In a third aspect, a communication method is provided, the method including:

the second network equipment receives a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS) in one time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS are overlapped.

With reference to the third aspect, in an implementation manner of the third aspect, a physical uplink shared channel, PUSCH, is scheduled on a time domain resource corresponding to the time unit, a DMRS is transmitted on the PUSCH, and an SRS configured by the second network device is transmitted on a time domain resource corresponding to the time unit.

With reference to the third aspect or any one of the above-mentioned respective implementations of the third aspect, in another implementation of the third aspect, before the second network device receives demodulation reference signals, DMRS, and sounding reference signals, SRS, over one time unit, the method further includes:

the second network device transmits first indication information used for indicating a first SRS parameter to a first network device, wherein the first SRS parameter is used for indicating a parameter used by the first network device for transmitting SRS in the time unit, the first SRS parameter is one of a plurality of sets of SRS parameters, and a frequency domain covered by the plurality of sets of SRS parameters comprises a frequency domain covered by a PUSCH which can be scheduled by the second network device for the first network device.

With reference to the third aspect or any one of the above-mentioned respective implementations of the third aspect, in another implementation of the third aspect, after the second network device receives a demodulation reference signal, DMRS, and a sounding reference signal, SRS, over one time unit, the method further includes:

and the second network equipment performs channel estimation on the time unit according to the DMRS and the SRS.

With reference to the third aspect or any one of the above corresponding implementation manners of the third aspect, in another implementation manner of the third aspect, the sending, by the second network device, first indication information used for indicating the first SRS parameter to the first network device includes:

and the second network equipment sends the first indication information for indicating the first SRS parameter to the first network equipment through a Physical Downlink Control Channel (PDCCH), and the PDCCH also comprises information of a Physical Uplink Shared Channel (PUSCH) scheduled by the second network equipment for the first network equipment.

With reference to the third aspect or any one of the above-described respective implementations thereof, in another implementation of the third aspect, the method further includes:

the second network device configures, for the first network device, a period for transmitting an SRS when performing short TTI transmission, or the second network device transmits, to the first network device, second indication information for indicating transmission of the SRS, so that the first network device determines the time unit for transmitting the SRS in which the DMRS and the frequency domain resources overlap with the DMRS.

With reference to the third aspect or any one of the above corresponding implementations of the third aspect, in another implementation of the third aspect, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

With reference to the third aspect or any one of the above corresponding implementations of the third aspect, in another implementation of the third aspect, the time unit is one TTI, one slot, or one subframe.

In a fourth aspect, a method of communication is provided, the method comprising:

configuring, by a second network device, a period for transmitting an additional demodulation reference signal (DMRS) for a first network device, or transmitting, by the second network device, third indication information to the first network device, so that the first network device transmits the additional DMRS on a first time unit according to the period or the third indication information, wherein the third indication information is used for indicating that the first network device transmits the additional DMRS on the first time unit, and another DMRS exists on the first time unit;

and the second network equipment receives the additional DMRS transmitted by the first network equipment on the first time unit, and performs channel estimation on the first time unit according to the additional DMRS and another DMRS existing on the first time unit.

With reference to the fourth aspect, in an implementation manner of the fourth aspect, the third indication information is sent by the second network device to the first network device through a physical downlink control channel PDCCH, and the PDCCH further includes information of a physical uplink shared channel PUSCH scheduled by the second network device for the first network device.

With reference to the fourth aspect or any one of the foregoing corresponding implementation manners of the fourth aspect, in another implementation manner of the fourth aspect, no sounding reference signal, SRS, configured by the second network device is transmitted on a time domain resource corresponding to the first time unit.

With reference to the fourth aspect or any one of the above-described respective implementations thereof, in another implementation of the fourth aspect, the method further includes:

the second network device receives a DMRS and an SRS over a second time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS overlap.

With reference to the fourth aspect or any one of the foregoing corresponding implementation manners of the fourth aspect, in another implementation manner of the fourth aspect, a physical uplink shared channel, PUSCH, is scheduled on a time domain resource corresponding to the second time unit, the PUSCH is transmitted with a DMRS, and an SRS configured by the second network device is transmitted on a time domain resource corresponding to the second time unit.

With reference to the fourth aspect or any one of the above-described respective implementations thereof, in another implementation of the fourth aspect, before the second network device receives the DMRS and SRS on the second time unit, the method further includes:

the second network device transmits first indication information used for indicating a first SRS parameter to a first network device, wherein the first SRS parameter is used for indicating a parameter used by the first network device for transmitting SRS in the second time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters comprises a frequency domain covered by a PUSCH (physical uplink shared channel) which can be scheduled by the second network device for the first network device.

With reference to the fourth aspect or any one of the above-described respective implementations thereof, in another implementation of the fourth aspect, after the second network device receives the DMRS and SRS on the second time unit, the method further includes:

and the second network equipment performs channel estimation on the second time unit according to the DMRS and the SRS.

With reference to the fourth aspect or any one of the above corresponding implementations of the fourth aspect, in another implementation of the fourth aspect, the sending, by the second network device, first indication information used for indicating the first SRS parameter to the first network device includes:

the second network device configures, for the first network device, a period for transmitting an SRS when performing short TTI transmission, or the second network device transmits, to the first network device, second indication information for indicating transmission of the SRS, so that the first network device determines to transmit the second time unit of the SRS in which the DMRS and the frequency domain resource overlap with the DMRS.

With reference to the fourth aspect or any one of the above corresponding implementations, in another implementation of the fourth aspect, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

With reference to the fourth aspect or any one of the above corresponding implementations of the fourth aspect, in another implementation of the fourth aspect, the first time unit is one TTI, one slot, or one subframe.

With reference to the fourth aspect or any one of the above corresponding implementations of the fourth aspect, in another implementation of the fourth aspect, the second time unit is one TTI, one slot, or one subframe.

In a fifth aspect, a first network device is provided, which includes:

the device comprises a transmitting module and a receiving module, wherein the transmitting module is used for transmitting a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS) in a time unit, and frequency domain resources of the SRS and frequency domain resources of the DMRS are overlapped.

With reference to the fifth aspect, in an implementation manner of the fifth aspect, a physical uplink shared channel PUSCH is scheduled on a time domain resource corresponding to the time unit, the PUSCH is transmitted with a DMRS, and an SRS configured by the second network device is transmitted on a time domain resource corresponding to the time unit.

With reference to the fifth aspect or any one of the above corresponding implementations of the fifth aspect, in another implementation of the fifth aspect, the first network device further includes:

the first determining module is configured to determine a first SRS parameter before the transmitting module transmits a demodulation reference signal, DMRS, and a sounding reference signal, SRS, in a time unit, where the first SRS parameter is used to indicate a parameter used by the first network device to transmit SRS in the time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH which can be scheduled by the second network device for the first network device.

a second determining module, configured to determine the time unit for transmitting the DMRS and the SRS whose frequency domain resources overlap with the DMRS before the transmitting module transmits the DMRS and SRS on one time unit.

a receiving module, configured to receive first indication information sent by the second network device, where the first indication information is used to indicate the first SRS parameter;

the first determining module is specifically configured to:

and determining the first SRS parameter according to the first indication information.

With reference to the fifth aspect or any one of the above corresponding implementations of the fifth aspect, in another implementation of the fifth aspect, the receiving module is specifically configured to:

receiving the first indication information sent by the second network device through a Physical Downlink Control Channel (PDCCH), wherein the PDCCH also comprises information of a Physical Uplink Shared Channel (PUSCH) scheduled by the second network device for the first network device.

With reference to the fifth aspect or any one of the above corresponding implementations, in another implementation of the fifth aspect, the plurality of sets of SRS parameters are configured in the first network device,

the first determining module is specifically configured to:

and selecting the first SRS parameter from the plurality of sets of SRS parameters according to the frequency domain of the PUSCH scheduled by the second network device for the first network device.

With reference to the fifth aspect or any one of the above corresponding implementations of the fifth aspect, in another implementation of the fifth aspect, the second determining module is specifically configured to:

and determining the time unit according to the period of sending the SRS, configured by the second network device for the first network device, or according to second indication information, sent by the second network device, indicating sending of the SRS, of the first network device, and scheduling a PUSCH on a time domain resource corresponding to the time unit, where the SRS configured by the second network device is sent on the time domain resource corresponding to the time unit.

With reference to the fifth aspect or any one of the above corresponding implementations, in another implementation of the fifth aspect, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

With reference to the fifth aspect or any one of the above corresponding implementations of the fifth aspect, in another implementation of the fifth aspect, the time unit is one TTI, one slot, or one subframe.

In a sixth aspect, a first network device is provided, comprising:

and a transmitting module, configured to transmit, by a first network device, an additional DMRS in a first time unit according to a period configured by a second network device for the first network device to transmit the additional DMRS, or transmit, by the first network device, third indication information according to the third indication information transmitted by the second network device, where the third indication information is used to indicate that the first network device transmits the additional DMRS in the first time unit, and another DMRS exists in the first time unit.

With reference to the sixth aspect, in an implementation manner of the sixth aspect, the third indication information is received by the first network device from the second network device through a physical downlink control channel PDCCH, and the PDCCH further includes information of a physical uplink shared channel PUSCH scheduled by the second network device for the first network device.

With reference to the sixth aspect or any one of the foregoing corresponding implementation manners of the sixth aspect, in another implementation manner of the sixth aspect, no sounding reference signal, SRS, configured by the second network device is transmitted on a time domain resource corresponding to the first time unit.

With reference to the sixth aspect or any one of the above corresponding implementations of the sixth aspect, in another implementation of the sixth aspect, the sending module is further configured to:

and transmitting the DMRS and the SRS in the second time unit, wherein the frequency domain resources of the SRS and the frequency domain resources of the DMRS are overlapped.

With reference to the sixth aspect or any one of the foregoing corresponding implementation manners of the sixth aspect, in another implementation manner of the sixth aspect, a physical uplink shared channel, PUSCH, is scheduled on a time domain resource corresponding to the second time unit, the DMRS is transmitted on the PUSCH, and an SRS configured by the second network device is transmitted on a time domain resource corresponding to the second time unit.

With reference to the sixth aspect or any one of the above corresponding implementations of the sixth aspect, in another implementation of the sixth aspect, the first network device further includes:

the first determining module is configured to determine a first SRS parameter before the first network device transmits the DMRS and the SRS in a second time unit, where the first SRS parameter is used to indicate a parameter used by the first network device to transmit in the second time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH which can be scheduled by the second network device for the first network device.

a second determining module to determine a second time unit in which to transmit a DMRS and an SRS in which frequency domain resources overlap with the DMRS before the first network device transmits the DMRS and the SRS on the second time unit.

the first determining module is specifically configured to:

With reference to the sixth aspect or any one of the above corresponding implementations of the sixth aspect, in another implementation of the sixth aspect, the receiving module is specifically configured to:

With reference to the sixth aspect or any one of the above-described corresponding implementations of the sixth aspect, in another implementation of the sixth aspect, the plurality of sets of SRS parameters are configured in the first network device,

the first determining module is specifically configured to:

With reference to the sixth aspect or any one of the above corresponding implementations of the sixth aspect, in another implementation of the sixth aspect, the second determining module is specifically configured to:

and determining the second time unit according to the period of sending the SRS, configured by the second network device for the first network device, or according to second indication information, sent by the second network device, indicating sending of the SRS, of the first network device, and scheduling a PUSCH on a time domain resource corresponding to the second time unit, where the SRS configured by the second network device is sent on the time domain resource corresponding to the second time unit.

With reference to the sixth aspect or any one of the above corresponding implementations, in another implementation of the sixth aspect, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

With reference to the sixth aspect or any one of the above corresponding implementations of the sixth aspect, in another implementation of the sixth aspect, the first time unit is one TTI, one slot, or one subframe.

With reference to the sixth aspect or any one of the above corresponding implementations of the sixth aspect, in another implementation of the sixth aspect, the second time unit is one TTI, one slot, or one subframe.

In a seventh aspect, a second network device is provided, including:

the device comprises a receiving module and a processing module, wherein the receiving module is used for receiving a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS) in a time unit, and frequency domain resources of the SRS and frequency domain resources of the DMRS are overlapped.

With reference to the seventh aspect, in an implementation manner of the seventh aspect, a physical uplink shared channel PUSCH is scheduled on a time domain resource corresponding to the time unit, a DMRS is transmitted on the PUSCH, and an SRS configured by the second network device is transmitted on a time domain resource corresponding to the time unit.

With reference to the seventh aspect or any one of the above corresponding implementations, in another implementation of the seventh aspect, the second network device further includes:

the terminal includes a transmitting module, configured to transmit, to a first network device, first indication information for indicating a first SRS parameter before a second network device receives a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS) in a time unit, where the first SRS parameter is used to indicate a parameter used by the first network device to transmit in the time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH that the second network device can schedule for the first network device.

and the channel estimation module is used for performing channel estimation on the time unit according to the DMRS and the SRS after the receiving module receives the DMRS and the SRS in one time unit.

With reference to the seventh aspect or any one of the above corresponding implementations, in another implementation of the seventh aspect, the sending module is specifically configured to:

and sending the first indication information for indicating the first SRS parameter to the first network equipment through a Physical Downlink Control Channel (PDCCH), wherein the PDCCH also comprises information of a Physical Uplink Shared Channel (PUSCH) scheduled by the second network equipment for the first network equipment.

With reference to the seventh aspect or any one of the above corresponding implementations, in another implementation of the seventh aspect, the method further includes:

a configuration module configured to configure a period for transmitting an SRS when the first network device is performing short TTI transmission,

or the sending module is further configured to send second indication information for indicating sending of the SRS to the first network device,

in order for the first network device to determine the time unit in which to transmit the SRS in which the DMRS and frequency domain resources overlap with the DMRS.

With reference to the seventh aspect or any one of the above corresponding implementations, in another implementation of the seventh aspect, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

With reference to the seventh aspect or any one of the above corresponding implementations, in another implementation of the seventh aspect, the time unit is one TTI, one slot, or one subframe.

In an eighth aspect, a second network device is provided, which includes:

a processing module, configured to configure a period for a first network device to transmit an additional demodulation reference signal (DMRS) for the first network device, or transmit, by the second network device, third indication information to the first network device, so that the first network device transmits the additional DMRS in a first time unit according to the period or the third indication information, where the third indication information is used to indicate that the first network device transmits the additional DMRS in the first time unit, and another DMRS exists in the first time unit;

a receiving module configured to receive an additional DMRS transmitted by the first network device over the first time unit;

and a channel estimation module, configured to perform channel estimation on the first time unit according to the additional DMRS and another DMRS existing in the first time unit.

With reference to the eighth aspect, in an implementation manner of the eighth aspect, the third indication information is sent by the second network device to the first network device through a physical downlink control channel PDCCH, and the PDCCH further includes information of a physical uplink shared channel PUSCH scheduled by the second network device for the first network device.

With reference to the eighth aspect or any one of the foregoing corresponding implementation manners of the eighth aspect, in another implementation manner of the eighth aspect, no sounding reference signal, SRS, configured by the second network device is transmitted on a time domain resource corresponding to the first time unit.

With reference to the eighth aspect or any one of the above corresponding implementations of the eighth aspect, in another implementation of the eighth aspect, the receiving module is further configured to:

receiving a DMRS and an SRS over a second time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS overlap.

With reference to the eighth aspect or any one of the foregoing corresponding implementation manners of the eighth aspect, in another implementation manner of the eighth aspect, a physical uplink shared channel, PUSCH, is scheduled on a time domain resource corresponding to the second time unit, the PUSCH is transmitted with a DMRS, and an SRS configured by the second network device is transmitted on a time domain resource corresponding to the second time unit.

With reference to the eighth aspect or any one of the above corresponding implementations of the eighth aspect, in another implementation of the eighth aspect, the method further includes:

a transmitting module, configured to transmit, to the first network device, first indication information for indicating a first SRS parameter before the second network device receives a DMRS and an SRS in a second time unit, where the first SRS parameter is used to indicate a parameter used by the first network device to transmit an SRS in the second time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH that can be scheduled by the second network device for the first network device.

With reference to the eighth aspect or any one of the above corresponding implementations of the eighth aspect, in another implementation of the eighth aspect, the channel estimation module is further configured to:

and after the receiving module receives the DMRS and the SRS in a second time unit, performing channel estimation on the second time unit according to the DMRS and the SRS in the second time unit.

With reference to the eighth aspect or any one of the above corresponding implementations of the eighth aspect, in another implementation of the eighth aspect, the sending module is specifically configured to:

in order for the first network device to determine the second time unit to transmit the SRS with the DMRS and frequency domain resources overlapping with the DMRS.

With reference to the eighth aspect or any one of the above corresponding implementations, in another implementation of the eighth aspect, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

With reference to the eighth aspect or any one of the above corresponding implementations of the eighth aspect, in another implementation of the eighth aspect, the first time unit is one TTI, one slot, or one subframe.

With reference to the eighth aspect or any one of the above corresponding implementations of the eighth aspect, in another implementation of the eighth aspect, the second time unit is one TTI, one slot, or one subframe.

In a ninth aspect, there is provided a network device comprising a processor, a memory, and a transceiver,

the memory is configured to store instructions, and the processor is configured to execute the instructions stored by the memory to control the transceiver to receive and transmit signals, and when the processor executes the instructions stored by the memory, the network device is configured to perform the method according to the first aspect or any one of the corresponding implementation manners of the first aspect.

In a tenth aspect, there is provided a network device comprising a processor, a memory and a transceiver,

the memory is configured to store instructions, and the processor is configured to execute the instructions stored by the memory to control the transceiver to receive and transmit signals, and when the processor executes the instructions stored by the memory, the network device is configured to perform the method according to the second aspect or any one of the implementation manners corresponding to the second aspect.

In an eleventh aspect, there is provided a network device comprising a processor, a memory, and a transceiver,

the memory is configured to store instructions, and the processor is configured to execute the instructions stored by the memory to control the transceiver to receive and transmit signals, and when the processor executes the instructions stored by the memory, the network device is configured to perform the method according to any one of the third aspect and the corresponding implementation manner of the third aspect.

In a twelfth aspect, there is provided a network device, comprising a processor, a memory, and a transceiver,

the memory is configured to store instructions, and the processor is configured to execute the instructions stored by the memory to control the transceiver to receive and transmit signals, and when the processor executes the instructions stored by the memory, the network device is configured to perform the method according to any one of the fourth aspect and the corresponding implementation manner of the fourth aspect.

Based on the above technical solution, in the communication method and the network device provided in the embodiments of the present invention, the first network device transmits both the DMRS and the SRS in a time unit, and the frequency domain resource of the DMRS and the frequency domain resource of the SRS are overlapped, so that the second network device can perform channel estimation on the time unit according to the DMRS and the SRS in the time unit, and can implement frequency offset estimation in the time unit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described 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 that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic architecture diagram of a communication system to which an embodiment of the present invention is applied.

Fig. 2 is a schematic flow chart of a communication method of one embodiment of the present invention.

Fig. 3 is a schematic flow chart of a communication method of another embodiment of the present invention.

Fig. 4 is a schematic flow chart of a communication method of a further embodiment of the present invention.

Fig. 5 is a schematic flow chart of a communication method of a further embodiment of the present invention.

Fig. 6 is a schematic flow chart of a communication method of a further embodiment of the present invention.

Fig. 7 is a schematic block diagram of a first network device according to an embodiment of the present invention.

Fig. 8 is another schematic block diagram of a first network device according to an embodiment of the present invention.

Fig. 9 is a schematic block diagram of a second network device according to an embodiment of the present invention.

Fig. 10 is another schematic block diagram of a second network device according to an embodiment of the present invention.

Fig. 11 is a schematic block diagram of a first network device according to yet another embodiment of the present invention.

Fig. 12 is a schematic block diagram of a first network device according to yet another embodiment of the present invention.

Fig. 13 is a schematic block diagram of a second network device according to yet another embodiment of the present invention.

Fig. 14 is a schematic block diagram of a second network device according to yet another 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 some, not all, embodiments of the present invention. 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.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, for example: global System for Mobile communications (GSM) System, Code Division Multiple Access (CDMA) System, Wideband Code Division Multiple Access (WCDMA) System, Long Term Evolution (LTE) System, LTE Frequency Division Duplex (FDD) System, LTE Time Division Duplex (TDD) System, Universal Mobile Telecommunications System (UMTS), inter-device Communication (D2D), inter-device Communication (M2M), and future 5G Communication System.

Various embodiments are described herein in connection with a network device, which may be a base station or a user equipment.

User equipment, which may also be referred to as terminal equipment, includes an access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device. An access terminal may be a cellular phone, a cordless phone, a SIP (Session Initiation Protocol) phone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), a handheld device with Wireless communication capability, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, and a user equipment in future networks, such as 5G networks.

The Base Station is used for communicating with a Mobile device, and may be a Base Transceiver Station (BTS) in GSM (Global System for Mobile communications) or CDMA (Code Division Multiple Access), or an NB (NodeB, Base Station) in WCDMA (Wideband Code Division Multiple Access), or an eNB or eNodeB (evolved Node B) in LTE, or a relay Station or an Access point, or a vehicle-mounted device, a wearable device, and a network device in a future network (such as a 5G network).

Moreover, various aspects or features of the invention may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard Disk, floppy Disk, magnetic tape, etc.), optical disks (e.g., CD (Compact Disk), DVD (Digital Versatile Disk), etc.), smart cards, and flash Memory devices (e.g., EPROM (Erasable Programmable Read-Only Memory), card, stick, key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

Fig. 1 shows a schematic architecture diagram of a communication system to which an embodiment of the invention is applied. As shown in FIG. 1, the communication system 100 may include a base station 102 and user equipments 104-114 (abbreviated as UEs in the figure) connected by wireless connection or wired connection or other means. Fig. 1 is a simplified schematic diagram of an example, and other network devices, not shown in fig. 1, may also be included in communication system 100.

In the existing LTE system, the length of the TTI of PUSCH scheduling is 1 ms. The 1ms TTI corresponds to one subframe, one subframe comprises two time slots, and 1 symbol is fixedly reserved on one time slot for transmitting the DMRS (the DMRS does not need to indicate UE by a base station, but is set by the system, and the UE automatically transmits the DMRS when being scheduled by the base station on the PUSCH). The embodiment of the invention relates to a short TTI, wherein the length of the short TTI is shorter than 1ms, namely shorter than one existing subframe, and a typical short TTI can be a 0.5ms TTI, and can also be a length unit comprising two or more symbols. In the communication system 100 shown in fig. 1, among the UEs 104 to 114 communicatively connected to the base station 102 at a certain time, a part may be UEs based on short TTI transmission, and another part may be UEs based on long TTI transmission; or all UEs based on short TTI transmission may be used, which is not limited in the embodiment of the present invention.

A transmission flow of a conventional Sounding Reference Signal (SRS) in a communication system will be briefly described below.

The SRS is used to probe the quality of the uplink channel. Through the SRS transmitted by the UE, the base station may probe the uplink channel quality of the UE, thereby determining the frequency location of the resource block allocated by the UE for uplink scheduling. The SRS is transmitted in the last symbol of a subframe, and the specific transmission process is as follows.

The base station configures a subframe configuration period and a subframe offset which can be used for sending the SRS in an uplink manner in a cell. The cell configuration is shown in the following table 1, where SRS-subframe configuration is the sequence number of subframe configuration, Binary is Binary representation of sequence number, and T is_SFCA period (subframe configuration period) is configured for the subframe,

is the subframe offset (subframe transmission offset). In practical applications, table 1 is configured in UE, and a base station allocates a sequence number of a subframe configuration (which may be signaled to the UE in a binary manner) to a certain UE served by the UE, for example, the sequence number is allocated to 0And (5) configuring subframes. The UE determines a subframe configuration period 1 and a subframe offset {0} corresponding to the subframe configuration according to table 1 and sequence number 0, and further knows the subframe for transmitting the SRS when the UE is uplink. The subframe configuration period 1 indicates that every 1 subframe is used as a period, and the subframe offset {0} indicates that subframe number 0 starts.

TABLE 1

SRS-SubframeConfig	Binary	T_SFC	Δ_SFC
				0	0000	1	{0}
1	0001	2	{0}
				2	0010	2	{1}
3	0011	5	{0}
				4	0100	5	{1}
5	0101	5	{2}
				6	0110	5	{3}
7	0111	5	{0，1}
				8	1000	5	{2，3}
9	1001	10	{0}
				10	1010	10	{1}
11	1011	10	{2}
				12	1100	10	{3}
13	1101	10	{0，1，2，3，4，6，8}
				14	1110	10	{0，1，2，3，4，5，6，8}
15	1111	reserved	reserved

It should be understood that after the base station configures the subframe capable of transmitting the SRS, a part of resources in the time domain, which are capable of transmitting the SRS, are referred to as SRS transmission subframes; and the other part of the resources in the time domain is not transmitted by the SRS, and is called a non-SRS transmission subframe. And the subframe and the TTI have a certain corresponding relation, so that SRS configured by the base station are transmitted on the time domain resources corresponding to some TTIs, and the SRS configured by the base station are not transmitted on the time domain resources corresponding to other TTIs.

And the base station configures the SRS bandwidth of the cell and the SRS bandwidth of the UE. For example, Table 2 shows that the uplink bandwidth is

And (4) configuring the bandwidth of the SRS. Wherein, C_SRSConfiguring the SRS bandwidth of the cell (SRS bandwidth configuration),B_SRSSRS Bandwidth configuration (SRS-Bandwidth), m, for a UE_SRSAnd sending bandwidth for the SRS of the UE, wherein N is a frequency hopping related parameter used for determining the frequency hopping bandwidth.

TABLE 2

Table 2 is also configured in the UE, and the base station allocates SRS bandwidth configuration of one cell and SRS bandwidth configuration of the UE to a certain UE served by the base station. For example, the base station allocates the SRS bandwidth configuration of the cell with sequence number 0 to the UE, and the SRS bandwidth configuration B of the UE_SRS0. The UE configures the bandwidth according to the SRS bandwidth of the cell corresponding to the serial number 0 and B_SRSM corresponding to 0_SRS，0Is 96, N₀If the bandwidth is 1, it can be known that the bandwidth for transmitting the SRS in the uplink is 96 RBs.

Relevant parameters of the SRS configured by the base station for the UE may mainly include SRS bandwidth, frequency domain starting position, comb, cyclic shift, antenna port, and the like, and the description of the relevant parameters is as follows.

For a subframe configured by a cell for SRS transmission, different UEs in the cell transmit SRS in the last symbol of the subframe. The SRS gap occupies subcarriers, and therefore the subcarriers occupied by the SRS are comb-shaped in the frequency domain. In order to ensure that SRS transmissions from different UEs are orthogonal to each other, different UEs may be configured to use different cyclic shifts or comb teeth in a same SRS bandwidth. The sequence of the SRS may use 8 different cyclic shifts and 2 different comb teeth, so that there are 16 resources available for transmitting the SRS in the same SRS bandwidth, that is, at most 16 SRS can be transmitted simultaneously in the SRS transmission bandwidth.

The frequency domain bandwidth is configured in a tree structure. Each SRS Bandwidth configuration (SRS Bandwidth configuration) corresponds to a tree structure, and an SRS Bandwidth (SRS-Bandwidth) of the highest layer (or referred to as the first layer) corresponds to a maximum SRS Bandwidth corresponding to the SRS Bandwidth configuration, or referred to as an SRS Bandwidth range. The maximum bandwidth of the SRS is 96 RBs, and the minimum bandwidth is 4 RBs.

And the UE calculates the bandwidth of the SRS according to the signaling indication of the base station, and then determines the frequency domain initial position of the SRS sent by the UE according to the upper layer signaling sent by the base station. The frequency domain starting position is represented by 5 bits, the range is 0.. 23, and 24 possible positions with 4RB as the minimum unit in the maximum detection bandwidth of 96 RBs can be represented.

In addition to configuring the UE with the relevant parameters of the periodic SRS through tables 1 and 2, the base station may also configure the UE with the relevant parameters of the aperiodic SRS. The periodic SRS and the aperiodic SRS correspond to trigger type 0 and trigger type 1 respectively. The SRS configuration index is used to indicate an SRS transmission period and a subframe offset, that is, a subframe for transmitting the SRS under trigger type 0 and a subframe for transmitting the SRS under trigger type 1 are determined. For a subframe that can transmit the SRS in trigger type 1, whether to transmit the SRS is indicated by Downlink Control Information (DCI) in a Physical Downlink Control signal (PDCCH).

When the UE transmits a periodic SRS, namely the SRS of trigger type 0, according to the SRS configuration index configured by the base station, in the subframe meeting the subframe configuration period and the subframe offset indicated by the SRS configuration index, the SRS is transmitted by using the configured transmission bandwidth, frequency hopping bandwidth, frequency domain starting position, comb teeth, cyclic shift, antenna port and the like. When the UE sends the aperiodic SRS, namely the SRS of trigger type 1, the base station sends PDCCH to trigger the UE to send the SRS. When the UE receives the PDCCH triggering the SRS in the subframe n, the UE may determine a subframe n + k according to the SRS configuration index, where k ≧ 4, and transmit the SRS using the configured SRS transmission bandwidth, frequency hopping bandwidth, frequency domain starting position, comb, cyclic shift, antenna port, and the like.

The communication method according to the embodiment of the present invention is described in detail below, where the first network device may correspond to a user equipment, and the second network device may correspond to a base station. It should be understood that the first network device corresponds to a user equipment and the second network device corresponds to a base station by way of example only and not limitation. The first network device and the second network device may be other network devices having similar functions of a user equipment or a base station, respectively.

Fig. 2 shows a schematic flow diagram of a communication method 200 of one embodiment of the invention. The method 200 may include:

s230, the first network equipment transmits a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS) in a time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS are overlapped.

Optionally, the time unit is one transmission time interval TTI. Optionally, the TTI is a short TTI. Optionally, the value of TTI is 0.5 ms.

Optionally, the time unit is one slot.

Optionally, the time unit is one subframe.

Prior to S230, the method may further include:

s210, the first network device determines a first SRS parameter, where the first SRS parameter is used to indicate a parameter used by the first network device to transmit an SRS in the time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH scheduled by the second network device for short TTI transmission by the first network device;

in S230, the SRS is transmitted according to the first SRS parameter determined in S210.

In this way, since the frequency domain of the DMRS transmitted in S230 is a part or all of the frequency domain of the PUSCH scheduled in the time unit, the frequency domain resources of the SRS and the frequency domain resources of the DMRS overlap with each other.

In S230, a PUSCH is scheduled on the time domain resource corresponding to the time unit, and an SRS configured by the second network device is transmitted on the time domain resource corresponding to the time unit.

Before S230, the method may further include:

s220, the first network device determines the time unit for transmitting the SRS in which the DMRS and the frequency domain resource overlap with the DMRS.

In the communication method provided by the embodiment of the present invention, the first network device transmits both the DMRS and the SRS in a time unit, and the frequency domain resource of the DMRS and the frequency domain resource of the SRS are overlapped, so that the second network device can perform channel estimation on the time unit according to the DMRS and the SRS in the time unit, and can implement frequency offset estimation in the time unit. When the method is applied to a short TTI scene, the frequency offset estimation under the short TTI condition can be realized.

The following description will be given taking the time unit as a short TTI as an example.

Specifically, the method 200 of the embodiment of the present invention is described by taking the first network device as the UE and the second network device as the base station as an example. The UE which needs to perform short TTI transmission, namely data is transmitted through the short TTI, determines a first SRS parameter, wherein the first SRS parameter is a specific one of the plurality of sets of SRS parameters. The frequency domain covered by the plurality of sets of SRS parameters includes a frequency domain covered by a PUSCH scheduled for short TTI transmission by the second network device for the first network device. The first SRS parameter is used for determining the parameter used for transmitting the SRS in the short TTI when the UE carries out the short TTI transmission. The frequency domain resource corresponding to the first SRS parameter overlaps with the frequency domain of the PUSCH scheduled by the base station for the UE to perform short TTI transmission. In this way, the UE may transmit both the SRS and the DMRS on the appropriate short TTI using the first SRS parameter, so that the base station may perform channel estimation, especially frequency offset estimation, on the short TTI according to the SRS and the DMRS.

The first SRS parameter may be one of a plurality of sets of frequency domain resources (SRS parameters) reserved by a system (e.g., a base station) exclusively from frequency domain resources used for transmission, for transmitting SRS in a short TTI. When configuring multiple sets of SRS parameters, the system may configure the SRS parameters according to a frequency domain possibly covered by a PUSCH scheduled by a base station for short TTI transmission of the UE. The system configures a plurality of sets of SRS parameters, so that frequency domains covered by the plurality of sets of SRS parameters comprise frequency domains possibly covered by PUSCHs scheduled by the base station for the UE to perform short TTI transmission. Therefore, no matter what PUSCH is transmitted and scheduled for the UE in the short TTI by the base station, the base station or the UE can select one set of SRS parameters from a plurality of sets of SRS parameters according to the frequency domain of the PUSCH, so that the frequency domain for transmitting the SRS is overlapped with the frequency domain of the PUSCH.

It should be understood that, in the embodiment of the present invention, preferably, when setting the frequency domain of the plurality of PUSCHs used for performing short TTI transmission and the plurality of sets of SRS parameters, the system should make the plurality of PUSCHs and the plurality of sets of SRS parameters correspond to each other. For example, the system sets two PUSCHs for short TTI transmission, each occupying 5 RBs, the two PUSCHs occupying 10 consecutive RBs in common; meanwhile, the system (or the base station) sets two sets of SRS parameters, where the frequency domain starting position of the first set of SRS parameters may be one of the first 5 RBs of 10 RBs, and the frequency domain starting position of the second set of SRS parameters may be one of the last 5 RBs of 10 RBs. In this way, when the base station schedules the first PUSCH for the UE during short TTI transmission, the UE can transmit the SRS by using the first set of SRS parameters; when the base station schedules a second PUSCH for the UE during short TTI transmission, the UE can use the second set of SRS parameters to transmit the SRS, so that the frequency domain of the PUSCH of the UE and the frequency domain of the SRS transmitted by the UE are overlapped, and the base station can receive the SRS and the DMRS on one short TTI, thereby carrying out channel estimation, particularly frequency offset estimation.

It should also be understood that, in the embodiment of the present invention, the UE determines the first SRS parameter may be determined according to an instruction sent by the base station to the UE, or may be determined by the UE according to related content, where the two schemes are developed in detail in the following specific embodiments.

As described in detail above with respect to S210, in S210, a frequency domain resource for transmitting an SRS may be determined, and S220 is described in detail below.

Specifically, in S220, the time unit meets two conditions, the first condition is that a PUSCH is scheduled on the time domain resource corresponding to the time unit, and the second condition is that an SRS configured by the base station is transmitted on the time domain resource corresponding to the time unit. The time domain resource for SRS transmission configured by the base station may be understood as the last slot of the SRS transmission subframe described above. The DMRS is transmitted in the time unit according to the first condition, the time unit is positioned on the SRS transmission subframe configured by the base station according to the second condition, and data is not transmitted when the SRS is transmitted in the time unit, so that the interference to the data is avoided.

Optionally, the embodiment of the present invention may be applied to a short TTI scenario. The UE may first determine whether the corresponding time unit is in a short TTI scenario, such as a slot in a short TTI scenario, before determining on which time unit to transmit the DMRS and the SRS whose frequency domain resources overlap with the frequency domain resources of the DMRS.

For example, the slot of the existing SRS transmission is the next slot of a subframe, since each slot is 0.5ms, which corresponds to one 0.5ms tti, in the slot, if there is PUSCH scheduling and there is DMRS transmission, the frequency domain resource used by the slot to transmit the SRS may overlap with the frequency domain resource of the PUSCH. Specifically, the parameter used for sending the SRS may be one of multiple sets of SRS parameters configured in advance, and the frequency domain covered by the multiple sets of SRS parameters includes a frequency domain possibly covered by a PUSCH scheduled by the base station for the UE to perform short TTI transmission. In this way, the network device may perform channel estimation on the TTI according to the DMRS and SRS on the slot corresponding to the TTI, so as to improve the quality of channel estimation, and in particular, may perform frequency offset estimation on the TTI according to the DMRS and SRS on the slot corresponding to the TTI.

It should be understood that the channel estimation and frequency offset estimation in the embodiment of the present invention may be performed by conventional means in the prior art, for example, by calculating the phase difference between SRS and DMRS signals occupying the same subcarrier and converting the phase difference into a frequency offset to perform frequency offset estimation of the system. The specific process is not described in detail in the embodiment of the present invention.

Optionally, as an embodiment, the S210, determining, by the first network device, the first SRS parameter may include:

the first network device determines the first SRS parameter according to the first indication information.

Specifically, the first SRS parameter may be determined by the base station and notified to the UE by the base station through the first indication information. The base station may reserve part of specific frequency domain resources from the frequency domain resources used for transmission for the UE performing short TTI transmission, so as to be used for SRS configuration, and for the UE performing short TTI transmission to transmit SRS. The reserved specific frequency domain resources may be divided into sets of SRS parameters. The frequency domain covered by the frequency domain resources corresponding to the multiple sets of SRS parameters comprises the frequency domain covered by the PUSCH scheduled by the UE which performs short TTI transmission. Thus, when the base station schedules the PUSCH for a specific UE performing short TTI transmission, the base station can always find a set of SRS parameters which are overlapped with the frequency domain position of the PUSCH. Preferably, the frequency domain covered by the sets of SRS parameters may cover the entire bandwidth of the system.

The sets of SRS parameters configured by the base station for the UE performing the short TTI transmission and the frequency domain resources configured by the base station for the UE performing the non-short TTI transmission may be non-overlapping. Therefore, the frequency domain in which the UE performing the short TTI transmission transmits the SRS and the frequency domain in which the UE performing the non-short TTI transmission transmits the SRS are completely different from each other, and interference between the frequency domains is not generated. In addition, the base station may allocate different SRS parameters to different UEs performing short TTI transmission, so that SRS transmitted by different UEs do not interfere with each other. In addition, in addition to allocating different SRS parameters to each UE, the base station may also configure different time domain resources for different UEs, so as to support that more UEs do not interfere with each other when transmitting SRS.

Optionally, in this embodiment of the present invention, the receiving, by the first network device, the first indication information sent by the second network device includes:

the first network device receives the first indication information sent by the second network device through a Physical Downlink Control Channel (PDCCH), and the PDCCH also comprises information of a Physical Uplink Shared Channel (PUSCH) scheduled by the second network device for short Transmission Time Interval (TTI) transmission of the first network device.

Specifically, after determining the PUSCH scheduled for the UE performing the short TTI transmission, the base station may determine the appropriate first SRS parameter according to the frequency domain position of the PUSCH scheduled for the UE. And simultaneously sending first indication information indicating the first SRS parameter and information of the PUSCH scheduled for the UE through the same PDCCH. And the UE determines time-frequency resources for sending the PUSCH according to the PDCCH, and the DMRS is sent on some symbols fixedly on the time-frequency resources for sending the PUSCH. And the UE sends the SRS according to the first SRS parameter on the PDCCH, so that the frequency domain of the SRS is at least partially overlapped with the frequency domain of the PUSCH.

It should be understood that, alternatively, in the embodiment of the present invention, the system may index each set of SRS parameters in the multiple sets of SRS parameters, and the multiple sets of SRS parameters and the corresponding relationship between the multiple sets of SRS parameters and the indexes thereof may be stored in the UE in advance in a manner notified by the base station or preconfigured. In the PDCCH corresponding to the PUSCH scheduled by the base station, the SRS parameter selected for the UE may be indicated to the UE through the first indication information. The first indication information may be an index of the SRS parameter, and the UE determines the first SRS parameter according to the received index and the corresponding relationship between the sets of SRS parameters and the indexes. Or, the UE may not store the relevant content of the multiple sets of SRS parameters, and the base station directly indicates the specific content of the first SRS parameter to the UE through the first indication information. For example, the first SRS parameter may include a transmission bandwidth, an antenna port, a cyclic shift, a comb, a frequency domain start position, and the like, which is not limited in this embodiment of the present invention.

Optionally, as an embodiment, the S220 determining, by the first network device, the time unit for transmitting the SRS in which the DMRS and the frequency domain resource overlap with the DMRS includes:

the first network device determines the time unit according to a period of sending the SRS when the second network device performs short TTI transmission configured for the first network device by the second network device, or according to second indication information sent by the second network device to send the SRS, and a PUSCH is scheduled on a time domain resource corresponding to the time unit, and the SRS configured for the second network device is sent on the time domain resource corresponding to the time unit.

Specifically, the time unit may be a short TTI. The UE can determine the TTI for transmitting the SRS according to the second indication information which is transmitted by the base station and indicates the SRS to be transmitted. The second indication information may implicitly indicate the TTI of sending the SRS, for example, the UE sends the SRS at a certain number of TTIs apart from the TTI of receiving the second indication information. The second indication information may also explicitly indicate the TTI of sending the SRS, for example, a field or an identifier for indicating the TTI is included in the second indication information, so that the UE can send the SRS in the TTI. It should be understood that the second indication information and the first indication information of the method 100 above may be combined into one indication information, for example, the first SRS parameter and a field indicating SRS transmission may be combined into one indication information, or only the first SRS parameter is transmitted, and the TTI of SRS transmission is implicitly indicated by the first SRS parameter, and the specific implementation manner of the present invention is not limited.

In addition, the UE may determine the TTI for transmitting the SRS according to the period of transmitting the SRS when the base station performs short TTI transmission configured for the UE. The period of transmitting SRS in short TTI transmission may be understood as being the period of transmitting SRS, where SRS is transmitted once every certain number of TTIs on PUSCH in which short TTI transmission is performed. For example, every 2 TTIs, one TTI is determined, that is, the TTI for transmitting the SRS is determined with 3 TTIs as a period. The period of transmitting SRS may also be understood as transmitting SRS once on the PUSCH for short TTI transmission when a preset time interval threshold is reached or exceeded. For example, the preset time interval threshold is 10ms, timing is started after the last SRS is transmitted, and when 10ms is reached and there is PUSCH scheduling, a TTI that can correspond to this time is determined as a TTI for transmitting the SRS; and when the PUSCH scheduling does not exist at the moment, waiting for the start of the next PUSCH scheduling, and determining the first TTI exceeding 10ms as the TTI for sending the SRS. There may be multiple ways to determine the TTI, and the embodiments of the present invention are not described in detail.

Optionally, as an embodiment, the SRS parameter information includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain start position.

For example, when the system bandwidth is

Then, the SRS parameters determined by the UE performing short TTI transmission include: transmission bandwidth of SRS (which may be a configuration similar to that shown in table 2 above), e.g. specifically transmission bandwidth B_SRS0; the frequency domain initial position is 0; comb TransmissionComb 0; cyclic shift cs 0; and the like, thereby determining the specific frequency domain position of the SRS transmitted by the UE performing the short TTI transmission. And determining the antenna port used for transmitting the SRS through the antenna port in the SRS parameter. Frequency hopping may also be performed when allowed, for example, with a hopping bandwidth of hbw 0. It should be understood that the above description of SRS parameters is by way of example only and not limiting on embodiments of the present invention.

Therefore, in the communication method provided in the embodiment of the present invention, by setting multiple sets of SRS parameters whose frequency domains include a frequency domain covered by a PUSCH scheduled by the first network device for short TTI transmission, the first network device can transmit both a DMRS and an SRS in a short TTI, and the second network device can perform channel estimation on the short TTI according to the DMRS and the SRS in the short TTI, and can perform frequency offset estimation in the short TTI.

The above embodiment is where the network device instructs the UE performing short TTI transmission to transmit SRS that is appropriate for the frequency domain of the PUSCH of the UE. In addition, the transmission of the SRS of the UE performing short TTI transmission can be kept unchanged from the prior art, and the base station adjusts the frequency domain range of the PUSCH scheduled for the UE so that the frequency domain range of the PUSCH is adapted to the SRS. That is, the scheduling of the base station is restricted so that the frequency domain of the PUSCH of the UE performing the short TTI transmission at least partially overlaps with the frequency domain of the SRS transmitted by the UE in the TTI.

Fig. 3 shows a schematic flow chart of a communication method 300 of another embodiment of the invention. The method 300 may include:

and S310, the first network device transmits an additional DMRS in a first time unit according to a period, configured by the second network device for the first network device, of transmitting a demodulation reference signal (DMRS), or the first network device transmits third indication information according to the second network device, wherein the third indication information is used for indicating the first network device to transmit the additional DMRS in the first time unit, and another DMRS exists in the time unit.

Alternatively, the first time unit may be a first TTI. Wherein the first TTI may be a short TTI. Alternatively, the short TTI may be 0.5ms, which is the same as the length of one slot.

Optionally, the first time unit may also be the first time slot.

Optionally, the first time unit may also be a first subframe.

Optionally, the embodiment of the present invention may be applied to a scenario of short TTI communication.

In the communication method provided by the embodiment of the present invention, the first network device sends the additional DMRS in the specific time unit according to the indication information sent by the second network device or according to the period, so that the base station performs channel estimation on the time unit according to the DMRS fixed in the time unit and the additional DMRS, thereby implementing frequency offset estimation of the time unit. When the method is applied to a short TTI scene, frequency offset estimation under the short TTI condition can be realized.

The following description will be given taking a time unit as a short TTI as an example.

Specifically, for a UE that uses a short TTI (e.g., 0.5ms TTI) for PUSCH transmission, in the prior art, only one fixed DMRS is used in one TTI, a single DMRS channel estimation is poor in effect, and frequency offset estimation cannot be achieved. In the embodiment of the present invention, the UE determines the short TTI for transmitting the two DMRSs (i.e., for transmitting the additional DMRSs) according to the TTI period configured by the base station for the UE or the third indication information transmitted by the base station. Therefore, the UE transmits two DMRSs in the specific first TTI, so that the base station can perform channel estimation, especially frequency offset estimation, on the first TTI according to the two DMRSs. Wherein the UE transmits an additional DMRS, a first DMRS, on a first symbol in the first TTI; a fixed DMRS, i.e., a second DMRS, is transmitted on a second symbol of the first TTI.

Typically, the DMRS fixed in the prior art, i.e., the second DMRS, is transmitted on the fourth symbol (middle symbol) of the slot corresponding to the 0.5ms TTI. The additional DMRS of the present embodiments, i.e., the first DMRS, may be transmitted on any one symbol other than the fourth symbol. Preferably, the additional DMRS, i.e., the first DMRS, may be transmitted on the last symbol of the slot corresponding to the first TTI.

The specific implementation manner of the TTI period for the base station to configure the UE for transmitting the additional DMRS during the short TTI transmission may be logically similar to the specific implementation manner of the period for the base station to configure the UE for transmitting the SRS in the method 200 described above, and details are not repeated here.

The specific implementation of the frequency offset estimation according to the two reference signals in the embodiment of the present invention may refer to some conventional methods. For example, the frequency offset estimation of the system is performed by calculating the phase difference between two DMRS signals occupying the same subcarrier and converting the phase difference into a frequency offset.

Optionally, in this embodiment of the present invention, the third indication information may be received by the first network device from the second network device through a physical downlink control channel PDCCH, and the PDCCH may further include information of a PUSCH scheduled by the second network device for the first network device.

Specifically, after determining the PUSCH scheduled for the UE performing short TTI transmission, the base station may transmit the third indication information and the PUSCH information scheduled for the UE through the same PDCCH. The third indication Information may be carried in Downlink Control Information (DCI), for example, the third indication Information is carried by one or several bits in the DCI. In addition, the base station may also send third indication information to the UE through higher layer signaling. The third indication information may indicate that the UE transmits the additional DMRS on a certain specific TTI, or may notify the UE of the transmission frequency of transmitting the additional DMRS, for example, each time the uplink transmission of two TTIs of the UE is scheduled, the UE needs to transmit two DMRSs in one TTI.

In one particular example, the UE may transmit two DMRSs, i.e., transmit additional DMRSs, according to a periodicity configured for it by the base station. For example, it is specified that when uplink transmission for a UE is not scheduled for more than N consecutive TTIs is satisfied, the uplink scheduled TTI for the UE needs to transmit an additional DMRS once.

It should be understood that, in the embodiment of the present invention, whether SRS transmission configured by the base station exists on the time domain resource corresponding to the first TTI may not be limited.

Preferably, no sounding reference signal, SRS, configured by the second network device is transmitted on the time domain resource corresponding to the first TTI. In other words, the existing sub-frame and time slot division mode is adopted. The time slot corresponding to the first TTI is the previous time slot of the subframe or the next time slot of the non-sounding reference signal SRS sending subframe.

As shown in FIG. 4, in one specific example method 400 of method 300, method 400 includes:

s410, a first network device transmits an additional DMRS in a first time unit according to a period, configured by a second network device for the first network device, of transmitting the additional DMRS, or the first network device transmits third indication information according to the second network device, where the SRS is not transmitted on a time domain resource corresponding to the first time unit, the third indication information is used to indicate that the first network device transmits the additional DMRS in the first time unit, and another DMRS exists in the first time unit;

the method 400 may further include:

s440, the first network device transmits a DMRS and an SRS in the second time unit, wherein a frequency domain resource of the SRS and a frequency domain resource of the DMRS overlap.

And scheduling a Physical Uplink Shared Channel (PUSCH) on the time domain resource corresponding to the second time unit, wherein the DMRS is transmitted on the PUSCH, and the SRS configured by the second network equipment is transmitted on the time domain resource corresponding to the second time unit.

Optionally, before the first network device transmits the DMRS and the SRS on the second time unit S440, the method 400 may further include:

s420, the first network device determines a first SRS parameter, where the first SRS parameter is used to indicate a frequency domain resource for the first network device to transmit an SRS in a second time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH which can be scheduled by the second network device for the first network device.

s430, the first network device determines the second time unit for transmitting the DMRS and the SRS whose frequency domain resources overlap with the DMRS.

Optionally, the second unit of time is one TTI. Optionally, the TTI is a short TTI. Optionally, the value of TTI is 0.5 ms.

Optionally, the second unit of time is one time slot.

Optionally, the second time unit is one subframe.

Specifically, in the prior art, for a subframe scheduled by a base station for a UE, a DMRS is transmitted in a slot before the subframe (including a non-cell-configured SRS transmission subframe and a cell-configured SRS transmission subframe), so that the base station can perform data demodulation according to the DMRS. In the non-cell-configured SRS transmission subframe, only one DMRS is also transmitted in the subsequent slot. The method 400 of the embodiment of the present invention further transmits an additional DMRS in the time slot (the first time unit) so that the base station performs frequency offset estimation according to the two DMRSs in one time unit.

For the second time unit of SRS transmission configured by the base station on the time domain resource, that is, for the slot after the SRS transmission subframe configured by the cell, in the prior art, the UE in the cell may transmit the SRS in the last symbol of the slot. However, for any UE, the frequency domain of the scheduled PUSCH may not overlap with the frequency domain of SRS transmission, i.e., there is no SRS transmission in the slot of the frequency domain of the PUSCH. In the method 400 of the embodiment of the present invention, when the PUSCH is scheduled on the time domain resource corresponding to the second time unit, the SRS is transmitted in the second time unit. In this way, the UE transmits the SRS on the last symbol of the second time unit, and the UE may also transmit the fixed DMRS on the fourth symbol of the second time unit. Therefore, the base station can perform channel estimation, especially frequency offset estimation, on the second time unit according to the DMRS and SRS on the symbol of the second time unit.

Optionally, in this embodiment of the present invention, S420 the first network device determines the first SRS parameter, including:

the first network device receives the first indication information sent by the second network device through a physical downlink control channel PDCCH, and the PDCCH also includes information of a PUSCH scheduled by the second network device for the first network device.

Optionally, in this embodiment of the present invention, the first network device is configured with the plurality of sets of SRS parameters,

s420 the first network device determines a first SRS parameter, including:

the first network device selects the first SRS parameter from the plurality of sets of SRS parameters according to a frequency domain of a PUSCH scheduled by the second network device for the first network device.

Optionally, in this embodiment of the present invention, S430 the determining, by the first network device, the second time unit for transmitting the SRS, where DMRS and frequency domain resources overlap with the DMRS, includes:

the first network device determines the second time unit according to a period of sending the SRS, configured by the second network device for the first network device, or according to second indication information, sent by the second network device, indicating sending of the SRS, where the time resource corresponding to the second time unit is scheduled with a PUSCH and the time resource corresponding to the second time unit is sent by the SRS configured by the second network device.

Optionally, in this embodiment of the present invention, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

It should be understood that the specific implementation of the method 400 according to the embodiment of the present invention corresponds to the specific implementation of the method 200 and the method 300, and is not described herein again.

The communication method according to the embodiment of the present invention is described in detail from the perspective of the first network device UE in conjunction with fig. 2 to 4, and is described below from the perspective of the second network device base station.

Fig. 5 shows a schematic flow chart of a communication method 500 of a further embodiment of the invention. Method 500 is performed by a second network device, which may be a base station, corresponding to the base station in method 200. The method 500 includes:

s520, the second network equipment receives a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS) in a time unit, wherein the frequency domain resource of the SRS is overlapped with the frequency domain resource of the DMRS.

Optionally, the time unit is one slot.

Optionally, the time unit is one subframe.

Optionally, a physical uplink shared channel PUSCH is scheduled on the time domain resource corresponding to the time unit, the PUSCH is transmitted with a DMRS, and the time domain resource corresponding to the time unit is transmitted with an SRS configured by the second network device.

Prior to S520, the method 500 may further include:

s510, the second network device sends, to the first network device, indication information for indicating a first SRS parameter, where the first SRS parameter is used to indicate a parameter used by the first network device to send an SRS in the time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH that can be scheduled by the second network device for the first network device.

After S520, the method 500 may further include:

s530, the second network device performs channel estimation on the time unit according to the DMRS and the SRS.

According to the communication method provided by the embodiment of the invention, the first network equipment can send the DMRS and the SRS in the time unit by setting the frequency domain comprising the plurality of sets of SRS parameters of the frequency domain covered by the PUSCH scheduled by the first network equipment for short TTI transmission, and the second network equipment can carry out channel estimation on the time unit and realize frequency offset estimation in the time unit according to the DMRS and the SRS in the time unit.

It should be understood that the second network device in the embodiment of the present invention may correspond to the second network device in the method 200, and perform the operation and/or function corresponding to that in the method 200, so as to implement the corresponding flow of the methods in fig. 2 and fig. 5, and for brevity, no further description is provided here.

Fig. 6 shows a schematic flow chart of a communication method 600 of a further embodiment of the invention. Method 600 is performed by a second network device, which may be a base station, corresponding to the base station in method 300. The method 600 comprises:

s610, a second network device configures, for a first network device, a period for sending an additional DMRS, or the second network device sends third indication information to the first network device, so that the first network device sends the additional DMRS on a first time unit according to the period or the third indication information, where the third indication information is used to indicate that the first network device sends the additional DMRS on the first time unit, and another DMRS exists in the first time unit;

s620, the second network device receives an additional first DMRS sent by the first network device in the first time unit, and performs channel estimation on the first time unit according to the first DMRS and a second DMRS existing in the first TTI.

In the communication method provided by the embodiment of the present invention, the first network device transmits the additional DMRS in the specific time unit according to the indication information or the period transmitted by the second network device, and the second network device performs channel estimation on the time unit according to the DMRS fixed in the time unit and the additional DMRS, so as to implement frequency offset estimation of the time unit. When the method is applied to a short TTI scene, frequency offset estimation under the short TTI condition can be realized.

It should be understood that the second network device in the embodiment of the present invention may correspond to the second network device in the method 300 or the method 400, and perform operations and/or functions corresponding to those in the method 300 or the method 400, so as to implement the corresponding flows of the methods in fig. 3, 4 and 6, which are not described herein again for brevity.

The first network device according to an embodiment of the present invention will be described in detail below with reference to fig. 7. As shown in fig. 7, the first network device 700 includes:

a transmitting module 730, configured to transmit a demodulation reference signal DMRS and a sounding reference signal SRS in a time unit, where frequency domain resources of the SRS and frequency domain resources of the DMRS overlap with each other.

And scheduling a Physical Uplink Shared Channel (PUSCH) on the time domain resource corresponding to the time unit, wherein the PUSCH is transmitted with a DMRS, and the time domain resource corresponding to the time unit is transmitted with an SRS configured by the second network equipment.

The first network device 700 may further include:

a first determining module 710, configured to determine a first SRS parameter before the transmitting module transmits a demodulation reference signal DMRS and a sounding reference signal SRS in a time unit, where the first SRS parameter is used to indicate a frequency domain resource for the first network device to transmit an SRS in the time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH that can be scheduled by the second network device for the first network device.

Optionally, the first network device 700 may further include:

a second determining module 720, configured to determine the time unit for transmitting the DMRS and the SRS whose frequency domain resources overlap with the DMRS.

In the first network device provided in the embodiment of the present invention, both the DMRS and the SRS are transmitted in a time unit, and frequency domain resources of the DMRS and the SRS are overlapped, so that the second network device can perform channel estimation on the time unit according to the DMRS and the SRS in the time unit, and can implement frequency offset estimation in the time unit.

In this embodiment of the present invention, optionally, the first network device 700 further includes:

the first determining module 710 is specifically configured to:

In this embodiment of the present invention, optionally, the receiving module is specifically configured to:

and receiving the first indication information sent by the second network device through a Physical Downlink Control Channel (PDCCH), wherein the PDCCH also comprises information of a Physical Uplink Shared Channel (PUSCH) scheduled by the second network device for the first network device.

In this embodiment of the present invention, optionally, the plurality of sets of SRS parameters are configured in the first network device 700,

the first determining module 710 is specifically configured to:

In this embodiment of the present invention, optionally, the second determining module 720 is specifically configured to:

In the embodiment of the present invention, optionally, the SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

It should be understood that the first network device 700 according to the embodiment of the present invention may correspond to the method 200 for performing the embodiment of the present invention, and the above and other operations and/or functions of each module in the first network device 700 are respectively for implementing corresponding flows of each method in fig. 2 and fig. 5, and are not described herein again for brevity.

In the first network device provided in the embodiment of the present invention, the first network device transmits both the DMRS and the SRS in a time unit, and the frequency domain resource of the DMRS and the frequency domain resource of the SRS are overlapped, so that the second network device can perform channel estimation on the time unit according to the DMRS and the SRS in the time unit, and can implement frequency offset estimation in the time unit.

The first network device 800 according to another embodiment of the present invention will be described in detail with reference to fig. 8. As shown in fig. 8, the first network device 800 includes:

a transmitting module 810, configured to transmit, by a first network device, an additional DMRS on a first time unit according to a period configured by a second network device for the first network device to transmit the additional DMRS, or transmit, by the first network device, third indication information according to the third indication information transmitted by the second network device, where the third indication information is used to indicate that the first network device transmits the additional DMRS on the first time unit, and another DMRS exists in the first time unit.

In the first network device provided in the embodiment of the present invention, the first network device sends the additional DMRS in the specific time unit according to the indication information sent by the second network device or according to the period, so that the base station performs channel estimation on the time unit according to the DMRS fixed in the time unit and the additional DMRS, and implements frequency offset estimation of the time unit. When the method is applied to a short TTI scene, frequency offset estimation under the short TTI condition can be realized.

In this embodiment of the present invention, optionally, the third indication information is received by the first network device from the second network device through a physical downlink control channel PDCCH, and the PDCCH further includes information of a PUSCH scheduled by the second network device for the first network device.

In this embodiment of the present invention, optionally, no sounding reference signal SRS configured by the second network device is transmitted on the time domain resource corresponding to the first time unit.

In this embodiment of the present invention, optionally, as shown in fig. 8, the sending module 810 is further configured to:

and transmitting the DMRS and the SRS in the second time unit, wherein the frequency domain resource of the SRS and the frequency domain resource of the DMRS are overlapped.

In this embodiment of the present invention, optionally, as shown in fig. 8, the first network device 800 further includes:

a first determining module 820, configured to determine a first SRS parameter before the first network device transmits the DMRS and the SRS in the second time unit, where the first SRS parameter is used to indicate a parameter used by the first network device to transmit in the second time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH that can be scheduled by the second network device for the first network device.

a second determining module 830, configured to determine a second time unit in which to transmit the DMRS and the SRS whose frequency domain resources overlap with the DMRS before the first network device transmits the DMRS and the SRS on the second time unit.

In this embodiment of the present invention, optionally, the first network device 800 further includes:

the first determining module 820 is specifically configured to:

and determining the first SRS parameter according to the second indication information.

In this embodiment of the present invention, optionally, the plurality of sets of SRS parameters are configured in the first network device 800,

the first determining module 820 is specifically configured to:

In this embodiment of the present invention, optionally, the second determining module 830 is specifically configured to:

In this embodiment of the present invention, optionally, the first SRS parameter includes a transmission bandwidth, an antenna port, a cyclic shift, a comb, and a frequency domain starting position.

It should be understood that the first network device 800 according to the embodiment of the present invention may correspond to performing the

communication methods

300 and 400 in the embodiment of the present invention, and the above and other operations and/or functions of each module in the first network device 800 are respectively for implementing corresponding flows of each method in fig. 3, fig. 4 and fig. 6, and are not described herein again for brevity.

In the first network device provided in the embodiment of the present invention, the UE sends the additional DMRS in the specific time unit according to the indication information sent by the base station or according to the period, so that the base station performs channel estimation on the time unit according to the DMRS fixed in the time unit and the additional DMRS, and implements frequency offset estimation of the time unit. When the method is applied to a short TTI scene, frequency offset estimation under the short TTI condition can be realized.

The second network device 900 according to an embodiment of the present invention will be described in detail with reference to fig. 9. As shown in fig. 9, the second network device 900 includes:

a receiving module 920, configured to receive a demodulation reference signal DMRS and a sounding reference signal SRS in one time unit, where frequency domain resources of the SRS and frequency domain resources of the DMRS overlap with each other.

The second network device provided in the embodiment of the present invention may perform channel estimation on a time unit according to the DMRS and SRS on the time unit, and may implement frequency offset estimation on the time unit.

Optionally, in this embodiment of the present invention, the second network device 900 further includes:

a sending module 910, configured to send, to a first network device, first indication information indicating a first SRS parameter before the second network device receives a demodulation reference signal DMRS and a sounding reference signal SRS in a time unit, where the first SRS parameter is used to indicate a parameter used by the first network device to send in the time unit, the first SRS parameter is one of multiple sets of SRS parameters, and a frequency domain covered by the multiple sets of SRS parameters includes a frequency domain covered by a PUSCH that can be scheduled by the second network device for the first network device.

a channel estimation module 930, configured to perform channel estimation on a time unit according to a demodulation reference signal DMRS and a sounding reference signal SRS after the receiving module 910 receives the DMRS and the SRS in the time unit.

In the second network device provided in the embodiment of the present invention, the first network device transmits both the DMRS and the SRS in a time unit, and the frequency domain resource of the DMRS and the frequency domain resource of the SRS overlap with each other, and the second network device may perform channel estimation on the time unit according to the DMRS and the SRS in the time unit, and may implement frequency offset estimation in the time unit.

It should be understood that the second network device 900 according to the embodiment of the present invention may correspond to the method 500 for performing the embodiment of the present invention, and the above and other operations and/or functions of each module in the second network device 900 are respectively for implementing corresponding flows of each method in fig. 2 and fig. 5, and are not described herein again for brevity.

The second network device 1000 according to another embodiment of the present invention will be described in detail below with reference to fig. 10. As shown in fig. 10, the second network device 1000 includes:

a processing module 1010, configured to configure a period for transmitting an additional demodulation reference signal DMRS for a first network device, or transmit, by a second network device, third indication information to the first network device, so that the first network device transmits an additional DMRS on a first time unit according to the period or the third indication information, where the third indication information is used to indicate that the first network device transmits an additional DMRS on the first time unit, and another DMRS exists in the first time unit;

a receiving module 1020, configured to receive an additional DMRS transmitted by the first network device in the first time unit;

a channel estimation module 1030 configured to perform channel estimation on the first time unit according to the additional DMRS and another DMRS existing in the first time unit.

In the second network device provided in the embodiment of the present invention, the first network device sends the additional DMRS in the specific time unit according to the indication information sent by the second network device or according to the period, and the second network device performs channel estimation on the time unit according to the DMRS fixed in the time unit and the additional DMRS, so as to implement frequency offset estimation of the time unit. When the method is applied to a short TTI scene, frequency offset estimation under the short TTI condition can be realized.

It should be understood that the second network device 1000 according to the embodiment of the present invention may correspond to performing the communication method 600 in the embodiment of the present invention, and the above and other operations and/or functions of each module in the second network device 1000 are respectively for implementing corresponding flows of each method in fig. 3 and fig. 6, and are not described herein again for brevity.

According to the method provided by the embodiment of the present invention, as shown in fig. 11, an embodiment of the present invention further provides a communication apparatus, which may be a network device 1100, where the network device 1100 corresponds to the first network device in the

communication method

200, 300, 400, 500 or the method 600. The first network device may be a UE, a micro base station, or a small cell base station, which is not limited herein.

The network device 1100 includes a processor 1110, a memory 1120, a bus system 1130, a receiver 1140, and a transmitter 1150. The processor 1110, the memory 1120, the receiver 1140 and the transmitter 1150 are connected through a bus system 1130, the memory 1120 is used for storing instructions, and the processor 1110 is used for executing the instructions stored in the memory 1120 to control the receiver 1140 to receive signals and control the transmitter 1150 to transmit signals, thereby completing the steps of the wireless access method. Wherein the receiver 1140 and the transmitter 1150 may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver.

The detailed steps can refer to the description of the above embodiments, and are not repeated herein.

As an implementation, the functions of the receiver 1140 and the transmitter 1150 may be considered to be implemented by a transceiving circuit or a dedicated chip for transceiving. Processor 1110 may be considered to be implemented by a special purpose processing chip, processing circuit, processor, or a general purpose chip.

As another implementation manner, the wireless access device provided by the embodiment of the present invention may be implemented by using a general-purpose computer. I.e., program code that implements the functions of the processor 1110, the receiver 1140 and the transmitter 1150, is stored in the memory, and a general-purpose processor implements the functions of the processor 1110, the receiver 1140 and the transmitter 1150 by executing the code in the memory.

For the concepts, explanations, details and other steps related to the technical solutions provided by the embodiments of the present invention related to the network device, reference is made to the descriptions of the foregoing methods or other embodiments, which are not described herein again.

According to the method provided by the embodiment of the present invention, as shown in fig. 13, an embodiment of the present invention further provides a communication apparatus, which may be a network device 1300, where the network device 1300 corresponds to a second network device in the

communication method

200, 300, 400, 500, or 600. The second network device may be a base station, or may be other devices, which is not limited herein.

The network device 1300 includes a processor 1310, a memory 1320, a bus system 1330, a receiver 1340, and a transmitter 1350. The processor 1310, the memory 1320, the receiver 1340, and the transmitter 1350 are connected to each other through the bus system 1330, the memory 1320 is used for storing instructions, and the processor 1310 is used for executing the instructions stored in the memory 1320 to control the receiver 1340 to receive signals and control the transmitter 1350 to transmit signals, thereby completing the steps of the wireless access method. Wherein the receiver 1340 and the transmitter 1350 may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver.

As an implementation manner, the functions of the receiver 1340 and the transmitter 1350 can be realized by a transceiving circuit or a dedicated chip for transceiving. The processor 1310 may be considered to be implemented by a dedicated processing chip, processing circuit, processor, or a general-purpose chip.

As another implementation manner, the wireless access device provided by the embodiment of the present invention may be implemented by using a general-purpose computer. I.e., program code that implements the functions of the processor 1310, the receiver 1340, and the transmitter 1350, is stored in the memory, and a general-purpose processor implements the functions of the processor 1310, the receiver 1340, and the transmitter 1350 by executing the code in the memory.

It should be understood that, in the embodiments of the present invention, the

processor

1110, 1210, 1310 or 1410 may be a Central Processing Unit (CPU), and the processor may also be other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The

memory

1120, 1220, 1320, or 1420 may include read-only memory and random access memory and provide instructions and data to the

processor

1110, 1210, 1310, or 1410. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information.

The

bus system

1130, 1230, 1330, or 1430 may include a power bus, a control bus, a status signal bus, etc., in addition to a data bus. For clarity of illustration, however, the various buses are labeled as a bus system in the figures.

In implementation, the steps of the above method may be performed by instructions in the form of software or integrated logic circuits of hardware in the

processor

1110, 1210, 1310 or 1410. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.

It should also be understood that the reference herein to first, second, third and various numerical designations is merely a convenient division to describe and is not intended to limit the scope of embodiments of the present invention.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method of communication, the method comprising:

the method comprises the steps that a first network device determines a first Sounding Reference Signal (SRS) parameter from multiple sets of SRS parameters configured by a first network device according to a frequency domain of a Physical Uplink Shared Channel (PUSCH) scheduled by a second network device for the first network device, wherein the first SRS parameter is used for indicating a parameter used by the first network device for transmitting an SRS in one time unit, and the frequency domains covered by the multiple sets of SRS parameters comprise the frequency domains covered by the PUSCH which can be scheduled by the second network device for the first network device;

the first network equipment transmits a demodulation reference signal (DMRS) and the SRS in the time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS are overlapped.

2. The method of claim 1, wherein a PUSCH is scheduled on the time domain resource corresponding to the time unit, wherein the DMRS is transmitted on the PUSCH, and wherein the SRS configured by the second network device is transmitted on the time domain resource corresponding to the time unit.

3. The method according to claim 1 or 2, characterized in that before the first network device transmits demodulation reference signals, DMRS, and sounding reference signals, SRS, over the time unit, the method further comprises:

4. The method of claim 1, wherein the first network device determines the first SRS parameters, comprising:

5. The method of claim 3, wherein the first network device determining the time unit for transmitting the SRS with the DMRS and frequency domain resources overlapping the DMRS comprises:

6. The method according to claim 1 or 2, wherein the time unit is one TTI, one slot or one subframe.

7. A method of communication, the method comprising:

the method comprises the steps that a second network device sends first indication information used for indicating a first Sounding Reference Signal (SRS) parameter to a first network device, wherein the first SRS parameter is used for indicating a parameter used by the first network device for sending an SRS in a time unit, the first SRS parameter is one of multiple sets of SRS parameters, and frequency domains covered by the multiple sets of SRS parameters comprise frequency domains covered by a Physical Uplink Shared Channel (PUSCH) which can be scheduled by the second network device for the first network device;

the second network device receives a demodulation reference signal (DMRS) and the SRS in the time unit, wherein frequency domain resources of the SRS and frequency domain resources of the DMRS are overlapped.

8. The method of claim 7, wherein a PUSCH is scheduled on the time domain resource corresponding to the time unit, wherein a DMRS is transmitted on the PUSCH, and wherein an SRS configured by the second network device is transmitted on the time domain resource corresponding to the time unit.

9. The method according to claim 7 or 8, characterized in that the method further comprises:

10. The method according to claim 7 or 8, wherein the time unit is one TTI, one slot or one subframe.

11. A network device comprising a processor, a memory, and a transceiver,

the memory is configured to store instructions, and the processor is configured to execute the instructions stored by the memory to control the transceiver to receive and transmit signals, and when the instructions stored by the memory are executed by the processor, the network device is configured to perform the method of any one of claims 1 to 6.

12. A network device comprising a processor, a memory, and a transceiver,

the memory is configured to store instructions, and the processor is configured to execute the instructions stored by the memory to control the transceiver to receive and transmit signals, and when the processor executes the instructions stored by the memory, the network device is configured to perform the method according to any one of claims 7 to 10.