Method and system for receiving reference signals

Abstract

The present application relates to the field of mobile communication technology, and more particularly to a kind of receiving method and system of reference signal, comprising: step S1: in accordance with pre-configured radio frequency gain, each signal symbol of current reference signal is received in turn until reaching predetermined symbol length;Step S2: in accordance with the tail end of the signal symbol received from the intercept length, intercept signal is obtained, and the signal power of intercept signal is used to generate the receiving gain corresponding to the next signal symbol;Step S3: the radio frequency gain is updated using the receiving gain, then return to step S1 to receive the next signal symbol.The beneficial effect is that: gain update is carried out separately for each sampling signal single signal symbol, when the last signal symbol reception reaches the predetermined symbol length, the radio frequency gain required for the next signal symbol is directly determined according to the intercept signal of this length and updated, avoiding the influence of historical gain, and achieving good reception effect of reference signal.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mobile communication technology, in particular to a receiving method and system of reference signal. BACKGROUND

[0002] In a mobile communication system, in order to achieve better communication quality between base station and user equipment, a series of reference signals are usually introduced to measure the channel quality of different services. For example, Channel State Information-Reference Signal (CSI-RS) is a kind of main reference signal, which can be used for user equipment to measure the signal sent by the base station to form Channel Quality Indicator (CQI) and other information.

[0003] In the prior art, the measurement process of the reference signal is usually performed by the base station or the user equipment, which modulates, transmits and receives specific reference signals through the downlink or uplink, and judges the channel quality of this process, including channel power, frequency offset, clock offset, etc., by processing, judging and decoding.

[0004] However, in the actual implementation process, the inventors found that since the user equipment needs to measure multiple reference signals, and the transmission period of some reference signals is relatively long, there is a large signal amplitude fluctuation between two measurements. If the RF (Radio Frequency) gain used in each reception is the historical gain obtained in the last reception, the current received signal may be saturated or too small in amplitude, which makes the SNR worse, even drops sharply, affecting the measurement performance. SUMMARY

[0005] In view of the above problems existing in the prior art, the present application provides a receiving method of reference signal; on the other hand, a receiving system of reference signal using the receiving method is also provided.

[0006] The specific technical solutions are as follows:

[0007] A receiving method of reference signal, suitable for the measurement process of reference signal by user equipment, comprising:

[0008] Step S1: receiving each signal symbol of the current reference signal in turn according to the pre-configured RF gain, and turning to step S2 when the length of the signal symbol reaches the predetermined symbol length;

[0009] Step S2: Truncating the tail end of the received signal symbol according to a pre-configured truncation length to obtain a truncated signal, and generating a reception gain corresponding to the next signal symbol according to the signal power of the truncated signal;

[0010] Step S3: Updating the reception gain with the radio frequency gain, and then returning to the step S1 to receive the next signal symbol.

[0011] In another aspect, the symbol length is the sum of the truncation length and an offset length, the offset length being determined according to the type of the reference signal and the truncation length, so that the truncated signal is located at the middle position of the signal symbol.

[0012] In another aspect, before the step S1 is performed, a sampling length determination process is further included, the sampling length determination process comprising:

[0013] Step A1: Receiving two adjacent groups of the reference signal and recording the reception time, and then generating a time offset according to the reception time;

[0014] Step A2: Generating a time offset variation value according to a plurality of the time offsets;

[0015] Step A3: Generating the truncation length according to the time offset variation value.

[0016] In another aspect, in the step A2, the time offset is filtered to obtain the time offset variation value by using the following method:

[0017] T offset [n]=a*T offset [n]+(1-α)*T offset [n-1];

[0018] In the formula, T offset [n] is the nth time offset variation value, T offset [0]=0,n≥1, and a is a filter coefficient.

[0019] In another aspect, in the step A3, the truncation length is generated by using the following method:

[0020]

[0021] In the formula, T is the truncation length, T offset [n] is the nth time offset variation value, T gap is a guard interval.

[0022] On the other hand, after performing the step S3, if all the signal symbols of the current reference signal are received, the radio frequency gain is stored for receiving the next group of reference signals.

[0023] On the other hand, the reference signal includes at least one of a synchronization signal block, a timing reference signal, a positioning reference signal, and a channel state information reference signal.

[0024] A reference signal receiving system for implementing the above-mentioned receiving method, comprising:

[0025] A receiving module, which receives each signal symbol of the current reference signal according to the radio frequency gain;

[0026] A gain generation module, which is connected to the receiving module, and generates a receiving gain corresponding to the reference signal by using the signal power of the intercepted signal obtained by intercepting the signal symbol;

[0027] An updating module, which is connected to the gain generation module, and updates the radio frequency gain by using the receiving gain.

[0028] On the other hand, it further comprises a length determination module, which is connected to the gain generation module and outputs the intercept length, and the length determination module comprises:

[0029] A time offset generation module, which receives two adjacent groups of reference signals and records the receiving time to generate a receiving time offset;

[0030] A time offset comparison module, which is connected to the time offset generation module, and generates a time offset change value according to a plurality of time offsets;

[0031] A length calculation module, which is connected to the time offset comparison module, and generates the intercept length according to the time offset change value.

[0032] On the other hand, it further comprises a storage module, which is connected to the updating module, and receives and stores the latest radio frequency gain for setting the radio frequency gain of the next group of reference signals.

[0033] The above technical solution has the following advantages or beneficial effects:

[0034] In the prior art, when the radio frequency module controls the input gain of the signal, the measurement effect is poor due to the change of the strength of the reference signal. In the scheme, the gain of each sampling signal is updated separately in a single measurement process. When the length of the previous signal symbol reaches a predetermined symbol length, the radio frequency gain required by the next signal symbol is determined according to the intercepted signal of the length, and the influence of the historical gain is avoided, so that the reference signal is received well. BRIEF DESCRIPTION OF DRAWINGS

[0035] The embodiments of the present application will be described in more detail with reference to the accompanying drawings. However, the accompanying drawings are only used for illustration and explanation, and do not constitute a limitation on the scope of the present application.

[0036] Figure 1 It is a whole schematic diagram of the embodiment of the present application.

[0037] Figure 2 It is a signal symbol schematic diagram in the embodiment of the present application.

[0038] Figure 3 It is a length generation process schematic diagram in the embodiment of the present application.

[0039] Figure 4 It is a receiving system schematic diagram in the embodiment of the present application.

[0040] Figure 5 It is a length determination module schematic diagram in the embodiment of the present application.

[0041] Figure 6 It is a storage module schematic diagram in the embodiment of the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0043] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0044] The present application will be further described below with reference to the accompanying drawings and specific embodiments, but is not limited by the present application.

[0045] The present application includes:

[0046] A reference signal receiving method, suitable for the measurement process of the reference signal by the user equipment, such as Figure 1As shown, comprising:

[0047] Step S1: receiving each signal symbol of the current reference signal in turn according to the pre-configured radio frequency gain, and turning to step S2 when the length of the signal symbol reaches the predetermined symbol length;

[0048] Step S2: intercepting from the tail end of the received signal symbol according to the pre-configured intercept length to obtain an intercepted signal, and generating a receiving gain corresponding to the next signal symbol according to the signal power of the intercepted signal;

[0049] Step S3: updating the radio frequency gain with the receiving gain, and then returning to step S1 to receive the next signal symbol.

[0050] Specifically, for the signal receiving method in the prior art, when receiving the reference signal with obvious changes in partial signal strength, the measurement is prone to inaccuracy due to improper setting of the radio frequency gain. In the embodiment, the reference signal is received while each signal symbol is timed, and when the length of the received signal reaches a specific symbol length, the signal symbol is intercepted to obtain an intercepted signal. Then, the signal power of the intercepted signal is calculated to determine the receiving gain to be used for the next signal symbol, and the radio frequency gain of the radio frequency module is updated, so that the receiving gain can be dynamically updated according to the signal symbol in each group of reference signals, and the measurement accuracy is improved.

[0051] In the implementation process, the above method is set in the user equipment as a software embodiment, which is a parallel process with the existing method for measuring the reference signal, that is, the user equipment measures the reference signal according to the original method, and at the same time, the above method also stores the received reference signal, distinguishes the signal symbol, calculates the length of the signal symbol, determines the receiving gain, and completes the updating process of the radio frequency gain before the next reception of the radio frequency module. The signal symbol refers to a plurality of sub-units in each reference signal, which may or may not be continuous according to different reference signals. The "receiving gain" and the "radio frequency gain" are the same gain value in value, wherein the receiving gain refers to the relatively appropriate receiving gain obtained by calculating the signal power of the intercepted signal in step S2, and the radio frequency gain refers to the radio frequency input gain actually configured in the radio frequency module. The radio frequency gain can be configured as different radio frequency gains according to different reference signals, so as to achieve better reception effect.

[0052] In one embodiment, the symbol length is the sum of the intercept length and the offset length, and the offset length is determined according to the type of the reference signal and the intercept length, so that the intercepted signal is located at the middle position of the signal symbol.

[0053] Specifically, to achieve better signal measurement effect, in the embodiment, when intercepting the signal symbol, as shown in Figure 2 , after calculating the intercept length as the symbol length , the offset length L1 is controlled to make the intercepted signal located in the middle position of the sampling symbol Sym1, so as to achieve better measurement effect of the signal power of the next sampling symbol Sym2. Generally, for the reference signal to be received, the total length L2 of a single signal symbol is a constant value. Then, after calculating the intercept length as the symbol length , the value of the offset length L1 can be calculated by the formula:

[0054] , and then when the buffered sampling symbol reaches the length of , the symbol length of is intercepted from the tail end in reverse, so as to obtain the intercepted signal located in the middle position. The intercepted signal can effectively represent the strength of the whole signal symbol, and better calculation effect is achieved.

[0055] In one embodiment, during the execution of the receiving method, a sampling length determination process is further included, as shown in Figure 3 , the sampling length determination process includes:

[0056] Step A1: receiving and recording the receiving time of two adjacent groups of reference signals, and then generating a time deviation according to the receiving time;

[0057] Step A2: generating a time deviation change value according to a plurality of time deviations;

[0058] Step A3: generating an intercept length according to the time deviation change value.

[0059] Specifically, to achieve better calculation effect of the signal symbol power, in the embodiment, during the process of receiving the reference signal, a relatively appropriate intercept length symbol is determined according to the reference signal. Specifically, the following three points need to be considered during the determination of the intercept length: first, the accuracy of power calculation, if the length is too short, the obtained power will be inaccurate; second, it can resist a certain system time deviation, , when the system time deviation is positive or negative , the length of symbol is reserved on the left and right, and accurate power can be obtained. The length of The smaller, the greater the time offset that can be resisted, but will result in inaccurate power calculation; third, the real-time of gain calculation and update, after the calculation of gain, if the reference signal is continuous in time domain, then the new gain needs to take effect at the beginning of the next symbol, so the update of the new gain requires to be completed within the symbol time.

[0060] On the basis of the above, in the initial state, the minimum length symbol that can accurately calculate the signal power is used as the initial interception length, and then the interception length is adjusted according to the time offset change of each adjacent reference signal, so as to achieve better power calculation effect.

[0061] In one embodiment, in step A2, the time offset is filtered to obtain the time offset change value by using the following method:

[0062] T offset [n] = a * T offset [n] + (1 - a) * T offset [n-1];

[0063] In the formula, T offset [n] is the nth time offset change value, T offset [0] = 0, n ≥ 1, and a is the filtering coefficient.

[0064] In one embodiment, in step A3, the symbol length is generated by using the following method:

[0065]

[0066] In the formula, T is the interception length, T offset [n] is the nth time offset change value, and T gap is the guard interval.

[0067] In one embodiment, after step S3 is performed, if all signal symbols of the current reference signal are received, the radio frequency gain is stored for receiving the next group of reference signals.

[0068] Specifically, to realize continuous reception of the reference signal, in the embodiment, after the reception of the current reference signal is completed, the last calculated radio frequency gain is stored as the historical gain of the next group of reference signals, and better reception effect is achieved.

[0069] ​In one embodiment, the reference signal comprises at least one of a Synchronization Signal and PBCH block (SSB), a Timing Reference Signal (TRS), a Positioning Reference Signal (PRS), a Channel State Information Reference Signal (CSI-RS).

[0070] A receiving system of a reference signal for implementing the above-mentioned receiving method, as shown in the accompanying drawings, comprises: Figure 4

[0071] a receiving module 1, which sequentially receives each signal symbol of the current reference signal according to the radio frequency gain;

[0072] a gain generating module 2, which is connected to the receiving module 1, and generates a receiving gain corresponding to the reference signal by using the signal power of the intercepted signal obtained by intercepting the signal symbol;

[0073] an updating module 3, which is connected to the gain generating module 2, and updates the radio frequency gain by using the receiving gain.

[0074] In one embodiment, it further comprises a length determining module 4, which is connected to the gain generating module 2 and outputs the intercepting length, as shown in the accompanying drawings, wherein the length determining module 4 comprises: Figure 5

[0075] a time offset generating module 41, which receives and records the receiving time of two adjacent groups of reference signals to generate a receiving time offset;

[0076] a time offset comparing module 42, which is connected to the time offset generating module 41, and generates a time offset change value according to a plurality of time offsets;

[0077] a length calculating module 43, which is connected to the time offset comparing module 42, and generates the intercepting length according to the time offset change value.

[0078] In one embodiment, as shown in the accompanying drawings, it further comprises a storage module 5, which is connected to the updating module 3, and receives and stores the latest radio frequency gain, which is used to set the radio frequency gain of the next group of reference signals. Figure 6

[0079] ​​​The above merely preferred embodiments of the present application and are not intended to limit the embodiments and protection scope of the present application. Those skilled in the art should be able to understand that any equivalent substitutions and obvious changes made according to the present application description and drawings should be included in the protection scope of the present application.

Claims

1. A method of receiving a reference signal, the method comprising: The application is suitable for a user equipment to measure a reference signal, comprising: Step S1: receiving each signal symbol of the current reference signal according to a pre-configured radio frequency gain, and turning to step S2 when the length of the signal symbol reaches a predetermined symbol length; Step S2: intercepting from the tail end of the received signal symbol according to a pre-configured intercept length to obtain an intercepted signal, and generating a receiving gain corresponding to the next signal symbol according to the signal power of the intercepted signal; Step S3: updating the radio frequency gain with the receiving gain, and then returning to step S1 to receive the next signal symbol.

2. The reception method according to claim 1, characterized in that, The symbol length is the sum of the intercept length and an offset length, and the offset length is determined according to the type of the reference signal and the intercept length, so that the intercepted signal is located at the middle position of the signal symbol.

3. The reception method according to claim 1, characterized in that, In the process of executing the receiving method, a sampling length determination process is further included, and the sampling length determination process comprises: Step A1: receiving two adjacent groups of the reference signal and recording the receiving time, and then generating a time offset according to the receiving time; Step A2: generating a time offset change value according to a plurality of groups of the time offset; Step A3: generating the intercept length according to the time offset change value.

4. The reception method according to claim 3, characterized in that, In step A2, the time offset is filtered to obtain the time offset change value by using the following method: ； In the formula, is the time offset variation value for the first time offset variation value, , is a filter coefficient.

5. The reception method according to claim 3, characterized in that, In step A3, the intercept length is generated by using the following method: ； In the formula, is the intercept length, is the first is the time offset change value, is the guard interval.

6. The reception method of claim 1, wherein, After step S3 is executed, if all the signal symbols of the current reference signal are received, the radio frequency gain is stored for receiving the next group of the reference signal.

7. The reception method of claim 1, wherein, The reference signal comprises at least one of a synchronization signal block, a timing reference signal, a positioning reference signal and a channel state information reference signal.

8. A reference signal receiving system, characterized by, A device for implementing the receiving method according to any one of claims 1-7, comprising: a receiving module, which receives each signal symbol of the current reference signal according to a radio frequency gain; a gain generation module, which is connected to the receiving module and generates a receiving gain corresponding to the reference signal by intercepting the signal symbol to obtain an intercepted signal and using the signal power of the intercepted signal; an updating module, which is connected to the gain generation module and updates the radio frequency gain with the receiving gain.

9. The receiving system of claim 8, wherein, Further comprising a length determination module, which is connected to the gain generation module and outputs the intercept length, and comprises: a time offset generation module, which receives two adjacent groups of the reference signal and records the receiving time to generate a receiving time offset; a time offset comparison module, which is connected to the time offset generation module and generates a time offset change value according to a plurality of groups of the time offset; a length calculation module, which is connected to the time offset comparison module and generates the intercept length according to the time offset change value.

10. The receiving system of claim 8, wherein, The application further comprises a storage module connected to the updating module, which receives and stores the latest radio frequency gain for setting the radio frequency gain of the next group of reference signals.

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