CN107846268A - Processing method, user equipment and the evolved node B of detection reference signal - Google Patents

Processing method, user equipment and the evolved node B of detection reference signal Download PDF

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Publication number
CN107846268A
CN107846268A CN201610835238.5A CN201610835238A CN107846268A CN 107846268 A CN107846268 A CN 107846268A CN 201610835238 A CN201610835238 A CN 201610835238A CN 107846268 A CN107846268 A CN 107846268A
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srs
symbols
uplink subframe
subframe
fdma symbols
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田涛
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Beijing Xinwei Telecom Technology Inc
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Beijing Xinwei Telecom Technology Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a kind of processing method of detection reference signal, user equipment and evolved node B.Exemplary, the transmission processing method of detection reference signal includes：By two continuous single-carrier frequency division multiple access access SC FDMA symbols in a sub-frame of uplink, detection reference signal SRS symbols are configured to；The sub-frame of uplink with the configured SRS symbols is sent, so that evolved node B carries out channel estimation.Processing method, user equipment and the evolved node B of detection reference signal provided in an embodiment of the present invention cause SRS to can adapt to the application scenarios of maximum Doppler frequency shift.

Description

Method for processing sounding reference signal, user equipment and evolved node B
Technical Field
The embodiment of the invention relates to the technical field of mobile communication, in particular to a method for processing a sounding reference signal, user equipment and an evolved node B.
Background
In a typical loaded LTE network, in order to ensure SRS transmission opportunities of each user, it is impossible to allocate a wideband close to the system transmission bandwidth configuration to a single user for SRS transmission, but allocate a plurality of different SRS transmission symbols, each SRS transmission symbol is allocated with a complementary narrower frequency band, and after combining the plurality of complementary narrower frequency bands, the wideband sounding information can be obtained, which requires that the channels of each SRS transmission symbol are correlated.
High-speed movement of LTE user equipment can produce large doppler shifts. Taking 2GHz carrier frequency and 350km/h user moving speed as an example, the uplink Doppler frequency offset can reach 1296 Hz. Such a large frequency offset may result in a channel coherence time of less than 1 ms. For FDD LTE, the SRS transmission symbol is the last SC-FDMA symbol of the uplink subframe, the minimum interval between the front SRS transmission symbol and the rear SRS transmission symbol is 1ms, and the channels are uncorrelated. For TDD LTE, there are 3 cases: (1) the SRS transmitting symbol is the last SC-FDMA symbol of the Normal uplink subframe, the minimum interval of the front SRS transmitting symbol and the rear SRS transmitting symbol is 1ms, and the channel is irrelevant; (2) the SRS transmitting symbol is an SC-FDMA symbol of UpPTS and the last SC-FDMA symbol of an uplink subframe, the interval between the front SRS transmitting symbol and the rear SRS transmitting symbol is more than or equal to 1ms, and the channel is irrelevant; (3) the SRS transmits two SC-FDMA symbols of UpPTS, and the channels are correlated.
In summary, for FDD LTE uplink subframes and TDD LTE Normal uplink subframes, the current minimum SRS period configuration cannot meet the requirement of wideband channel sounding under multi-user and large doppler shift conditions. In 3GPP LTE-a, the main application of using SRS to acquire channel information is coordinated multipoint, TDD also has dual-stream beamforming, and channel information of a wideband of each user is needed to ensure the practical effect of the applications.
Disclosure of Invention
In view of the foregoing technical problem, embodiments of the present invention provide a sounding reference signal processing method, user equipment, and an evolved node B, so that an SRS is adapted to an application scenario with large doppler shift.
In a first aspect, an embodiment of the present invention provides a method for sending and processing a sounding reference signal, which is applied to a user equipment, and the method includes:
two continuous single-carrier frequency division multiple access SC-FDMA symbols in one uplink subframe are configured as sounding reference signal SRS symbols;
and transmitting the uplink subframe with the configured SRS symbol so as to carry out channel estimation.
In a second aspect, an embodiment of the present invention further provides a method for receiving and processing a sounding reference signal, where the method is applied to an evolved node B, and the method includes:
receiving Sounding Reference Signals (SRS) in two continuous single carrier frequency division multiple access (SC-FDMA) symbols in an uplink subframe according to configuration information;
and performing channel estimation according to the received SRS.
In a third aspect, an embodiment of the present invention further provides a user equipment, where the user equipment includes:
the system comprises a configuration module, a detection module and a processing module, wherein the configuration module is used for enabling two continuous single-carrier frequency division multiple access SC-FDMA symbols in one uplink subframe to be configured as SRS symbols;
a sending module, configured to send the uplink subframe with the configured SRS symbol, so that an enodeb performs channel estimation.
In a fourth aspect, an embodiment of the present invention further provides an evolved node B, where the evolved node B includes:
the receiving module is used for receiving sounding reference signals SRS in two continuous single-carrier frequency division multiple access SC-FDMA symbols in one uplink subframe according to the configuration information;
and the estimation module is used for carrying out channel estimation according to the received SRS.
According to the sounding reference signal processing method, the user equipment and the evolved node B, two continuous SC-FDMA symbols in a time domain are adopted as SRS symbols to perform channel sounding, so that the time domain density of the SRS signals used in two times of channel estimation is improved, and the SRS is more suitable for application scenes of large Doppler frequency shift.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a flowchart of a method for processing sounding reference signal transmission according to a first embodiment of the present invention;
fig. 2 is a flowchart of configuration operations in a method for processing sounding reference signal transmission according to a second embodiment of the present invention;
FIG. 3 is a diagram illustrating the effect of resource allocation in a configuration operation according to a second embodiment of the present invention;
fig. 4 is a flowchart of configuration operations in a method for processing sounding reference signal transmission according to a third embodiment of the present invention;
FIG. 5 is a diagram illustrating the effect of resource allocation in a configuration operation according to a third embodiment of the present invention;
fig. 6 is a flowchart of configuration operations in a method for processing sounding reference signal transmission according to a fourth embodiment of the present invention;
FIG. 7 is a diagram illustrating the effect of resource allocation in a configuration operation according to a fourth embodiment of the present invention;
fig. 8 is a flowchart of a method for receiving and processing a sounding reference signal according to a fifth embodiment of the present invention;
fig. 9 is a flowchart of an estimation operation in a method for receiving and processing a sounding reference signal according to a sixth embodiment of the present invention;
fig. 10 is a block diagram of a user equipment provided in a seventh embodiment of the present invention;
fig. 11 is a block diagram of an enodeb according to an eighth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
First embodiment
The embodiment provides a technical scheme of a sounding reference signal sending and processing method. In the technical solution, the method for sending and processing the sounding reference signal is executed by a User Equipment (UE).
Referring to fig. 1, the method for sending and processing the sounding reference signal includes:
s11, two continuous single carrier frequency division multiple access SC-FDMA symbols in one uplink subframe are configured to be sounding reference signal SRS symbols.
In this embodiment, the UE transmits SRS symbols on two consecutive SC-FDMA symbols. Due to the adoption of the transmission processing mode, the transmission time interval between two SRS symbols is only one SC-FDMA symbol period, so that the channels detected by the two SRS symbols are closely related in the time dimension. In other words, the time domain density of the SRS symbol is improved, thereby ensuring that the uncertainty of SRS channel detection caused by large Doppler frequency shift can be overcome in a high-mobility scene.
It can be understood that to transmit SRS symbols on two consecutive SC-FDMA symbols, a specific SRS period and a corresponding SRS configuration index are required to be added. That is, UE-specific SRS period with 1SC-FDMA symbol period and corresponding SRS configuration index need to be added, where the period is denoted by 2, and is consistent with the method denoted by configuration index 0 in table 1, and the specific description of the configuration index is as follows:
for TDD-LTE, the UE-specific SRS period and subframe offset configuration after updating is shown in table 1 and table 2:
TABLE 1
SRS configuration index ISRS SRS period TSRS(ms) SRS subframe offset Toffset
0 2 0,1
1 2 0,2
2 2 1,2
3 2 0,3
4 2 1,3
5 2 0,4
6 2 1,4
7 2 2,3
8 2 2,4
9 2 3,4
10–14 5 ISRS–10
15–24 10 ISRS–15
25–44 20 ISRS–25
45–84 40 ISRS–45
85–164 80 ISRS–85
165–324 160 ISRS–165
325–644 320 ISRS–325
645-647 2 ISRS–643
648–1023 Retention Retention
TABLE 2
SRS configuration index ISRS SRS period TSRS,1(ms) SRS subframe offset Toffset,1
0 Retention Retention
1 2 0,2
2 2 1,2
3 2 0,3
4 2 1,3
5 2 0,4
6 2 1,4
7 2 2,3
8 2 2,4
9 2 3,4
10–14 5 ISRS–10
15–24 10 ISRS–15
25–28 Retention Retention
29-31 2 ISRS–27
The SRS period and subframe offset configuration shown in table 1 are applicable to Trigger Type 0 services, and the SRS period and subframe offset configuration shown in table 2 are applicable to Trigger Type 1 services.
The SRS period and subframe offset configuration after FDD-LTE update are shown in tables 3 and 4:
TABLE 3
SRS configuration index ISRS SRS period TSRS(ms) SRS subframe offset Toffset
0–1 2 ISRS
2–6 5 ISRS–2
7–16 10 ISRS–7
17–36 20 ISRS–17
37–76 40 ISRS–37
77–156 80 ISRS–77
157–316 160 ISRS–157
317–636 320 ISRS–317
637-638 2 ISRS–637
639–1023 Retention Retention
TABLE 4
The uplink subframe for transmitting the SRS with the SRS period of 1SC-FDMA symbol meets the following conditions:
for TDD, an uplink subframe for transmitting SRS needs to satisfy the following formula (1):
wherein k isSRSIndicating the uplink subframe index number, T, within a radio frameoffsetAnd Toffset,1SRS subframe offset representing triggertype 0 and trigger type 1 cases, respectively. Further preferably, the last two SC-FDMA symbols in the uplink subframe satisfying the above formula condition are selected to configure the SRS symbol.
For FDD, an uplink subframe for transmitting SRS needs to satisfy the following formula (2):
wherein n isfDenotes the radio frame index, kSRSIndicating the uplink subframe index number, T, within a radio frameoffsetAnd Toffset,1SRS subframe offset, T, representing trigger type 0 and trigger type 1 conditions, respectivelySRSAnd TSRS，1The SRS periods for the trigger type 0 and trigger type 1 cases are shown, respectively.
Moreover, two SRS symbols consecutive in the time domain are complementary in the frequency domain. Specifically, the complementary meaning is: combining two time-domain consecutive SRS symbolsThe frequency can cover the broadband frequency to be detected. Two consecutive SRS symbol frequency changes are required, which is achieved by frequency hopping, which is achieved by the frequency index parameter n in the following equation (3)bTo be implemented.
The frequency starting point position k of the SRS symbol0Determined according to the following equation (3):
wherein,mSRS,baccording to cell specific parameters CSRSAnd UE specific parameters BSRSAnd (4) determining.
And wherein Number of RBs, k, corresponding to the uplink bandwidthTCThe comb parameter value for setting is 0 or 1.
And, if not frequency hoppingIs a fixed value, where nRRCFor a set UE frequency location, NbAccording to cell specific parameters CSRSAnd UE specific parameters BSRSDetermining; if frequency hopping is determined by the following equation (4):
f in the formula (4)b(nSRS) Determined by the following equation (4-1):
n in the formula (4-1)SRSDetermined by the following equation (4-2):
wherein N isSPIndicates the number of uplink and downlink switching points in a radio frame, nfIndicating the system radio frame number, nsIndicating the number of slots in a radio frame, TSRSDenotes the SRS period, ToffsetDenotes SRS subframe offset, Toffset_maxRepresents the maximum value of the SRS subframe offset.
Determining the position of the frequency start point of the SRS symbol according to the formula and according to the cell specific parameter CSRSAnd UE specific parameters BSRSAnd determining the number of SRS resource blocks in an uplink subframe, and finally determining the resource block index of the SRS symbol.
It should be noted that the subframe for transmitting the SRS symbol should be the uplink subframe for transmitting SRS with SRS period of 1SC-FDMA symbol as described above, and satisfy equations (5-1) and (5-2).
For TDD, an uplink subframe for transmitting SRS should satisfy the following formula (5-1):
for FDD, an uplink subframe for transmitting SRS should satisfy the following equation (5-2):
in the formulae (5-1) and (5-2), nfDenotes the radio frame index, kSRSIndicating the uplink subframe index number, T, within a radio frameoffsetAnd Toffset,1SRS subframe offset, T, representing trigger type 0 and trigger type 1 conditions, respectivelySRSAnd TSRS，1The SRS periods for the trigger type 0 and trigger type 1 cases are shown, respectively.
S12, sending the uplink subframe with the configured SRS symbol to carry out channel estimation.
After the configuration of the two continuous SRS symbols is completed, the uplink subframe with the configured SRS symbols is sent to an evolved node B at an access network side to help the evolved node B complete channel estimation.
Because the time interval between two consecutive SRS symbols is only the time interval of one SC-FDMA symbol, the technical scheme provided by the embodiment can overcome doppler shift caused by high mobility, and correlate the time domains of the channels detected by two SRS.
Taking a conventional Cyclic Prefix (CP) as an example, the time interval between two SC-FDMA symbols is 1/14 of the original interval between two uplink subframes. If extended CP is employed, the time interval between two SC-FDMA symbols is 1/12 of the time interval between the original two uplink subframes. This means that the doppler shift supported by the solution provided in this embodiment is 14 times or 12 times the original doppler shift.
In this embodiment, two consecutive SC-FDMA symbols in one uplink subframe are configured as SRS symbols, and the uplink subframe with the configured SRS symbols is sent, so that the time domain density of SRS signals used in two channel estimations is improved, and the SRS is more suitable for an application scenario with large doppler shift.
Second embodiment
The present embodiment further provides a technical solution of configuration operation in the method for processing sounding reference signal transmission based on the first embodiment of the present invention. In the technical scheme, the newly added SRS configuration index corresponds to a configuration index 645 under the TDD LTE Trigger Type 0 or a configuration index 29 under the TDD LTE Trigger Type 1.
Referring to fig. 2, configuring two consecutive SC-FDMA symbols in one uplink subframe as SRS symbols includes:
and S21, determining the SRS period and the SRS subframe offset according to the SRS configuration index.
In this embodiment, the system bandwidth is configured to be 10MHz, and the ratio of uplink and downlink subframes is 0 by using the normal CP. Cell bandwidth configuration parameter CSRSIs 0, the UE bandwidth configuration parameter BSRSIs 1. Frequency hopping bandwidth b of SRShopIs 0, frequency domain position parameter nRRCIs 0, comb transmission parameter KTCIs 0.
Under the above configuration, the corresponding subframe offset ToffsetIs 2.
And S22, determining the uplink subframe of the SRS transmitted by the user equipment according to the SRS period and the SRS subframe offset and by combining the cell-level SRS subframe configuration.
The calculation according to equation (5-1) can result in that the subframes with subframe numbers 2 and 7 are used for sending SRS symbols.
Further, according to formula (3), the SRS frequency start position of each SC-FDMA symbol is given by formula (6):
k0＝k0′+12×48×n0+12×24×n1(6)
wherein k is0The value of' is 12. Parameter nbGiven by the following equation (8):
s23, determining the number of resource blocks in an uplink subframe.
Specifically, the number of resource blocks in the uplink subframe is determined according to the following table 5: the number of SRS resource blocks allocated by the cell is 48, and the number of resource blocks for the user equipment to transmit SRS symbols is 24.
TABLE 5
S24, according to the number of the resource blocks, determining the resource block indexes of the two continuous SC-FDMA symbols.
For the penultimate symbol of subframe 2, nSRS＝4nfFor the last symbol n of subframe 2SRS＝4nf+1, the penultimate symbol n for subframe 7SRS＝4nf+2, for the last symbol n of subframe 7SRS＝4nf+2. May be F according to the formula (3-1)b(nSRS) Then n is calculated according to the formula (8)bSubstituting into equation (7) to calculate k0Then, the resource block index of the SC-FDMA symbol for transmitting the SRS is determined, and the specific results are shown in table 6.
TABLE 6
Fig. 3 shows the resource allocation result of the present embodiment. Referring to fig. 3, the SRS frequency resource of the second last symbol and the SRS frequency resource of the last symbol of the same subframe are not overlapped with each other, and each SRS transmission symbol uses 24 continuous RB frequency resources, thereby realizing maximum utilization of the system bandwidth frequency resource by the SRS.
In this embodiment, two consecutive SC-FDMA symbols in one uplink subframe are configured as SRS symbols, and the uplink subframe with the configured SRS symbols is sent, so that the time domain density of SRS signals used in two channel estimations is improved, and the SRS is more suitable for an application scenario with large doppler shift.
Third embodiment
The present embodiment further provides a technical solution of configuration operation in the method for processing sounding reference signal transmission based on the first embodiment of the present invention. In this technical solution, the newly added SRS configuration index corresponds to the configuration index 646 in the TDD LTE Trigger Type 0 or the configuration index 30 in the TDD LTE Trigger Type 1.
Referring to fig. 4, configuring two consecutive SC-FDMA symbols in one uplink subframe as SRS symbols includes:
and S41, determining the SRS period and the SRS subframe offset according to the SRS configuration index.
In this embodiment, the system bandwidth is configured to be 15MHz, a normal CP is adopted, and the ratio of uplink and downlink subframes is 1. Cell bandwidth configuration parameter CSRSIs 1, the UE bandwidth configuration parameter BSRSIs 1. Frequency hopping bandwidth b of SRShopIs 0, frequency domain position parameter nRRCIs 65, comb transmission parameter KTCIs 1.
Under the above parameter configuration, the corresponding subframe deviation value ToffsetIs 3.
And S42, determining the uplink subframe of the SRS transmitted by the user equipment according to the SRS period and the SRS subframe offset and by combining the cell-level SRS subframe configuration.
The calculation according to equation (5-1) can result in that the subframes with subframe numbers 3 and 8 are used for sending SRS symbols.
According to equation (3), the SRS frequency start position of each SC-FDMA symbol is given by equation (8):
k0＝k0′+12×64×n0+12×32×n1(8)
wherein k is0' the value is 61, the parameter nbGiven by the following equation (9):
in the formula (9), the parameter F1(nSRS) Given by the following equation (10):
s43, determining the number of resource blocks in an uplink subframe.
Specifically, the number of resource blocks in the uplink subframe is determined according to the following table 7:
TABLE 7
S44, according to the number of the resource blocks, determining the resource block indexes of the two continuous SC-FDMA symbols.
In this embodiment, the cyclic shift value n corresponding to the second last symbol of the subframeSRSCan be determined according to the following equation (11):
cycle one position n corresponding to last symbol of subframeSRSCan be determined according to the following equation (12):
the resource block corresponding to the SRS symbol may be determined according to the following table 8:
TABLE 8
Fig. 5 shows the resource allocation result of the present embodiment. Referring to fig. 5, the frequency resource of the SRS of the penultimate symbol and the frequency resource of the SRS of the last symbol of the same subframe are not overlapped with each other, so that the SRS can be utilized to the maximum extent for the frequency resource of the whole system bandwidth.
In this embodiment, two consecutive SC-FDMA symbols in one uplink subframe are configured as SRS symbols, and the uplink subframe with the configured SRS symbols is sent, so that the time domain density of SRS signals used in two channel estimations is improved, and the SRS is more suitable for an application scenario with large doppler shift.
Fourth embodiment
The present embodiment further provides a technical solution of configuration operation in the method for processing sounding reference signal transmission based on the first embodiment of the present invention. In the technical scheme, the newly added SRS configuration index corresponds to the configuration index 647 under the TDD LTE Trigger Type 0 or the configuration index 31 under the TDD LTE Trigger Type 1.
Referring to fig. 6, configuring two consecutive SC-FDMA symbols in one uplink subframe as SRS symbols includes:
and S61, determining the SRS period and the SRS subframe offset according to the SRS configuration index.
In this embodiment, the system bandwidth is configured to be 20MHz, and the ratio of uplink and downlink subframes is 0 by using a normal CP. Cell zoneWide configuration parameter CSRSIs 0, the UE bandwidth configuration parameter BSRSIs 1. Frequency hopping bandwidth b of SRShopIs 0, frequency domain position parameter nRRCIs 0, comb transmission parameter KTCIs 0.
Under the above parameter configuration, the corresponding subframe deviation value ToffsetIs 4.
And S62, determining the uplink subframe of the SRS transmitted by the user equipment according to the SRS period and the SRS subframe offset and by combining the cell-level SRS subframe configuration.
The calculation according to equation (5-1) can result in that the subframes with subframe numbers 4 and 9 are used for sending SRS symbols.
According to equation (3), the SRS frequency revealing position of each SC-FDMA symbol is given by equation (13):
k0＝k0′+12×96×n0+12×48×n1(13)
s62, determining the number of resource blocks in an uplink subframe.
Specifically, the resource block corresponding to the SRS symbol is determined according to the following table 9:
TABLE 9
Wherein k is0' the value is 24, the parameter nbGiven by the following equation (14):
in the formula (15), the parameter F1(nSRS) Given by the following equation (15):
s63, according to the number of the resource blocks, determining the resource block indexes of the two continuous SC-FDMA symbols.
For the second last symbol of a subframe, there is a relationship as in equation (16):
for the last symbol of the subframe, there is a relationship of equation (17):
the resource block corresponding to the SRS symbol may be determined according to the following table 10:
watch 10
Fig. 6 shows the resource allocation result of the present embodiment. Referring to fig. 6, the frequency resource of the SRS of the penultimate symbol and the frequency resource of the SRS of the last symbol of the same subframe are not overlapped with each other, so that the SRS can be utilized to the maximum extent for the frequency resource of the whole system bandwidth.
In this embodiment, two consecutive SC-FDMA symbols in one uplink subframe are configured as SRS symbols, and the uplink subframe with the configured SRS symbols is sent, so that the time domain density of SRS signals used in two channel estimations is improved, and the SRS is more suitable for an application scenario with large doppler shift.
Fifth embodiment
The embodiment provides a technical scheme of a method for receiving and processing a sounding reference signal. In this technical solution, the method for receiving and processing the sounding reference signal is performed by an Evolved node B (eNB).
Referring to fig. 8, the method for receiving and processing the sounding reference signal includes:
s81, according to the configuration information, receiving sounding reference signal SRS symbols in two continuous single carrier frequency division multiple access SC-FDMA symbols in one uplink subframe.
In the present embodiment, SRS symbols are provided in two consecutive SC-FDMA symbols in one uplink subframe. The SRS symbols are primarily used for channel measurements. The SRS symbols are typically arranged in the last two SC-FDMA symbols in one uplink subframe. Also, the two SC-FDMA symbols have complementary frequencies.
Since two SC-FDMA symbols are consecutive to each other in time sequence, the time interval between the two is the duration of one SC-FDMA symbol. Since the SC-FDMA symbols used as SRS symbols are very small in interval in time, signals to be detected by the two SRS symbols have strong correlation in time. Therefore, the method provided by the embodiment can be suitable for the situations of high mobility and large doppler shift, and channel uncorrelation of two SRS detections before and after caused by the large doppler shift is avoided.
In this embodiment, the SRS symbol employs a frequency hopping pattern. Moreover, since the two SC-FDMA symbols have complementary frequencies, by receiving the two SC-FDMA symbols which are consecutive in time sequence, complete detection of the target frequency can be accomplished.
And S82, performing channel estimation according to the SRS symbol received.
Preferably, the estimation performed on the channel may be an estimation of a parameter such as a signal-to-noise ratio of the channel. Moreover, since the SRS symbols adopt the frequency hopping mode, in the process of estimating the channel, the channel estimation can be performed on the frequency band corresponding to each individual SRS symbol first, and finally, the estimation results of each frequency band are combined to obtain the estimation result of the whole target frequency band.
It should be noted that, when the configured SRS symbol collides with the PUCCH in format 2/2A/2B in the same uplink subframe, the SRS is not transmitted.
In this embodiment, by receiving SRS symbols in two consecutive SC-FDMA symbols in one uplink subframe according to configuration information and performing channel estimation according to the received SRS symbols, the time domain density of SRS signals used in two times of channel estimation is improved, so that the SRS is more suitable for an application scenario with large doppler shift.
Sixth embodiment
The present embodiment further provides a technical solution of an estimation operation in the method for receiving and processing a sounding reference signal based on the fifth embodiment of the present invention. In this technical solution, performing channel estimation according to the received SRS symbol includes: respectively estimating the signal-to-noise ratio of channels corresponding to SRS symbols according to the SRS symbols in two received continuous SC-FDMA symbols; and combining the estimation results of the two SRS symbols to obtain an estimation result of the complete frequency band.
Referring to fig. 9, performing channel estimation according to the received SRS symbol includes:
and S91, respectively estimating the signal-to-noise ratio of the channel according to the SRS symbols in the two received continuous SC-FDMA symbols.
In this embodiment, the received SRS symbols employ a frequency hopping pattern. That is, a plurality of SRS symbols having complementary frequency bands are used for channel sounding of a target frequency band.
Specifically, the enodeb receives the SRS symbols at a plurality of different resource block locations, and performs channel estimation of a corresponding frequency band according to the received SRS symbols. In this embodiment, the channel estimation specifically refers to estimation of a signal-to-noise ratio parameter of a channel.
And S92, combining the estimation results of the two SRS symbols to obtain the estimation result of the complete frequency band.
And after the two SRS symbols are used for carrying out channel estimation on the frequency bands respectively corresponding to the SRS symbols, combining the estimation results of each frequency band to obtain the estimation result of the complete frequency band.
In this embodiment, the signal-to-noise ratio of the channel is estimated according to the SRS symbols in two received consecutive SC-FDMA symbols, and the estimation results of the two SRS symbols are combined to obtain the estimation result of the complete frequency band, thereby implementing the complete estimation of the target frequency band by using the frequency hopping mode.
Seventh embodiment
The embodiment provides a technical scheme of user equipment. In this technical solution, referring to fig. 10, the user equipment includes: a configuration module 101, and a sending module 102.
The configuration module 101 is configured to configure two consecutive single carrier frequency division multiple access SC-FDMA symbols in one uplink subframe as sounding reference signal SRS symbols.
The sending module 102 sends the uplink subframe with the configured SRS symbol to perform channel estimation. And when the configured SRS symbol collides with the PUCCH with the format 2/2A/2B in the same uplink subframe, the SRS is not transmitted.
Preferably, the two consecutive SC-FDMA symbols are the last two consecutive SC-FDMA symbols in the uplink subframe.
Preferably, the two consecutive SC-FDMA symbols have complementary frequencies.
Preferably, the time interval between two consecutive SC-FDMA symbols is one SC-FDMA symbol period.
Preferably, the configuration module 101 includes: the device comprises a subframe offset determining unit, a resource block number determining unit and a resource block index determining unit.
The subframe offset determining unit is used for determining an SRS period and an SRS subframe offset according to the SRS configuration index.
The resource block number determining unit is used for determining the number of resource blocks in one uplink subframe.
The resource block index determining unit is used for determining the resource block indexes of the two continuous SC-FDMA symbols according to the number of the resource blocks.
Preferably, the uplink subframe satisfies formula (5-1) and formula (5-2).
Eighth embodiment
The present embodiment provides a technical solution of an evolved node B. In this technical solution, referring to fig. 11, the enodeb includes: a receiving module 111, and an estimating module 112.
The receiving module 111 is configured to receive, according to the configuration information, a sounding reference signal SRS symbol in two consecutive single carrier frequency division multiple access SC-FDMA symbols in one uplink subframe.
The estimation module 112 is configured to perform channel estimation according to the received SRS symbol.
Preferably, the two consecutive SC-FDMA symbols are the last two consecutive SC-FDMA symbols in the uplink subframe.
Preferably, the two consecutive SC-FDMA symbols have complementary frequencies.
Preferably, the estimation module 112 includes: a separate estimation unit, and a result merging unit.
And the respective estimation unit is used for respectively estimating the signal-to-noise ratio of the channel corresponding to the SRS symbol according to the SRS symbol in two received continuous SC-FDMA symbols.
And the result combining unit is used for combining the estimation results of the two SRS symbols to obtain the estimation result of the complete frequency band.
Preferably, the uplink subframe satisfies formula (5-1) and formula (5-2).
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A method for sending and processing a sounding reference signal, applied to user equipment, is characterized by comprising:
two continuous single-carrier frequency division multiple access SC-FDMA symbols in one uplink subframe are configured as sounding reference signal SRS symbols;
and transmitting the uplink subframe with the configured SRS symbol so as to carry out channel estimation.
2. The method of claim 1, wherein the two consecutive SC-FDMA symbols are the last two consecutive SC-FDMA symbols in the uplink subframe.
3. The method of claim 2, wherein the two consecutive SC-FDMA symbols have complementary frequencies.
4. The method of claim 3, wherein the time interval between two consecutive SC-FDMA symbols is one SC-FDMA symbol period.
5. The method of claim 4, wherein configuring two consecutive SC-FDMA symbols in one uplink subframe as SRS symbols comprises:
determining an SRS period and SRS subframe offset according to the SRS configuration index;
determining an uplink subframe for transmitting the SRS by the user equipment according to the SRS period and the SRS subframe offset and by combining with the cell-level SRS subframe configuration;
determining the number of resource blocks used for transmitting SRS in one uplink subframe;
and determining the resource block indexes of the two continuous SC-FDMA symbols according to the number of the resource blocks.
6. The method of claim 1, wherein the uplink subframe satisfies the following formula:
for the case of TDD it is also possible to,
for the case of FDD,
wherein n isfDenotes the radio frame index, kSRSIndicating the uplink subframe index number, T, within a radio frameoffsetAnd Toffset,1Respectively representSRS subframe offset, T, for trigger type 0 and trigger type 1 conditionsSRSAnd TSRS，1Respectively, the SRS periods for triggertype 0 and trigger type 1 cases.
7. A method for receiving and processing Sounding Reference Signals (SRS) applied to an evolved node B (eNB), the method comprising:
receiving Sounding Reference Signal (SRS) symbols in two continuous single carrier frequency division multiple access (SC-FDMA) symbols in an uplink subframe according to configuration information;
and performing channel estimation according to the received SRS symbol.
8. The method of claim 7, wherein the two consecutive SC-FDMA symbols are the last two consecutive SC-FDMA symbols in the uplink subframe.
9. The method of claim 8, wherein the two consecutive SC-FDMA symbols have complementary frequencies.
10. The method of claim 9, wherein performing channel estimation based on the received SRS symbols comprises:
respectively carrying out channel estimation on resource blocks corresponding to the SRS according to the SRS in two received continuous SC-FDMA symbols;
and combining the channel estimation results of the two SRSs to obtain a broadband channel estimation result.
11. The method of claim 7, wherein the uplink subframe satisfies the following formula:
for the case of TDD it is also possible to,
for the case of FDD,
wherein n isfDenotes the radio frame index, kSRSIndicating the uplink subframe index number, T, within a radio frameoffsetAnd Toffset,1SRS subframe offset, T, representing trigger type 0 and trigger type 1 conditions, respectivelySRSAnd TSRS，1Respectively, the SRS periods for triggertype 0 and trigger type 1 cases.
12. A user device, comprising:
the system comprises a configuration module, a detection module and a processing module, wherein the configuration module is used for enabling two continuous single-carrier frequency division multiple access SC-FDMA symbols in one uplink subframe to be configured as SRS symbols;
a sending module, configured to send the uplink subframe with the configured SRS symbol, so that an enodeb performs channel estimation.
13. An evolved node-B, comprising:
the receiving module is used for receiving sounding reference signals SRS in two continuous single-carrier frequency division multiple access SC-FDMA symbols in one uplink subframe according to the configuration information;
and the estimation module is used for carrying out channel estimation according to the received SRS symbol.
CN201610835238.5A 2016-09-20 2016-09-20 Processing method, user equipment and the evolved node B of detection reference signal Withdrawn CN107846268A (en)

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