WO2024108533A1

WO2024108533A1 - Signal processing method and apparatus, and storage medium

Info

Publication number: WO2024108533A1
Application number: PCT/CN2022/134268
Authority: WO
Inventors: 李长庚; 鲁绍贵; 陈秀; 黄海清; 鲁志兵
Original assignee: 深圳市运联通通信服务有限公司
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2024-05-30

Abstract

Disclosed are a signal processing method and apparatus, and a storage medium. The method comprises: an extended unit (EU) acquiring frequency domain signals, which are converted from time domain signals that are sent by N remote radio units (RRUs), wherein the N RRUs are mounted under the EU, and a terminal UE is within the coverage range of M RRUs of the N RRUs, with M being a positive integer greater than one, and M being less than or equal to N; the EU measuring a signal intensity within a bandwidth range, which corresponds to the UE and is on the frequency domain signals, so as to obtain a measurement result, wherein the measurement result comprises a signal-to-interference-plus-noise ratio (SINR) under each RRU; and the EU performing combination processing on L SINRs with top SINR values, which SINRs are selected from the measurement result, and sending to a BBU a combination processing result and an equivalent SINR, which is obtained on the basis of the L SINRs.

Description

Signal processing method, device and storage medium

field

The present disclosure generally relates to the field of communications, and more specifically to a signal processing method, device, and storage medium.

background

The wireless extended pico base station is a distributed, miniaturized, low-power cellular base station for indoor scenarios. It usually adopts the networking mode of BBU (Base Band Unit) + EU (Extended Unit) + RRU (Remote Radio Unit), as shown in Figure 1. In the wireless extended pico base station system networking, the terminal is often only in the signal coverage area of one or several RRUs. For the downlink signal sent by the base station to the terminal, it is usually copied and distributed under each EU and its RRU. However, the uplink signal sent by the terminal to the base station will only be received by one RRU or several adjacent RRUs, which may belong to the same EU or different EUs. For the uplink signals of different EUs, a signal selection algorithm is often used to ensure that the performance will not be lost. However, for RRUs belonging to the same EU, due to the transmission bandwidth limitation between the BBU and the EU, the RF signals of all RRUs connected to it can only be merged and compressed in the EU.

Overview

In a first aspect, the present disclosure provides a signal processing method, which includes: an extension unit EU obtains a frequency domain signal converted from a time domain signal sent by N remote radio frequency units RRU, wherein the N RRUs are mounted under the EU, and a terminal UE is within the coverage of M RRUs among the N RRUs; M is a positive integer greater than 1, and M is less than or equal to N; the EU measures the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal to obtain a measurement result, wherein the measurement result includes a signal to interference plus noise ratio SINR under each of the RRUs; the EU combines the top L SINRs selected from the measurement results, and sends the combined processing result and the equivalent SINR obtained based on the L SINRs to a baseband unit BBU, wherein the value of L is a positive integer greater than 1 and less than N.

In a second aspect, the present disclosure provides a signal processing method, which includes: the BBU receives a combined processing result sent by a first target EU and an equivalent SINR obtained by the first target EU based on L SINRs, wherein the combined processing result is obtained by combining L SINRs with the top SINR values selected by the first target EU from the measurement results, and the measurement result is obtained by measuring the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal, and the frequency domain signal is converted from a time domain signal sent by N RRUs mounted under the EU; the first target EU is any EU under the BBU; the BBU combines the combined processing result and the equivalent SINR sent by the second target EU, and decodes the UE based on the combined processing result, wherein the second target EU is the EU corresponding to the M RRUs covering the UE.

In the third aspect, the present disclosure provides a signal processing device, which is applied to the EU side, and includes: an acquisition module, configured to acquire a frequency domain signal converted from a time domain signal sent by N remote radio frequency units RRUs, wherein the N RRUs are mounted under the EU, and the terminal UE is within the coverage range of M RRUs among the N RRUs; M is a positive integer greater than 1, and M is less than or equal to N; a measurement module, configured to measure the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal to obtain a measurement result, wherein the measurement result includes a signal to interference plus noise ratio SINR under each of the RRUs; a first processing module, configured to merge L SINRs with the top SINR values selected from the measurement results, and send the merged processing result and the equivalent SINR obtained based on the L SINRs to the BBU, wherein the value of L is a positive integer greater than 1 and less than N.

In a fourth aspect, the present disclosure provides a signal processing device, which is applied to the BBU side, and includes: a receiving module, configured to receive a combined processing result sent by a first target EU and an equivalent SINR obtained by the first target EU based on L SINRs, wherein the combined processing result is obtained by combining L SINRs with the top SINR values selected by the first target EU from the measurement results, and the measurement result is obtained by measuring the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal, and the frequency domain signal is converted from a time domain signal sent by N RRUs mounted under the EU; the first target EU is any EU under the BBU; a second processing module, configured to combine the combined processing result and the equivalent SINR sent by the second target EU, and decode the UE based on the combined processing result, wherein the second target EU is the EU corresponding to the M RRUs covering the UE.

In a fifth aspect, the present disclosure provides an electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

a memory configured to store a computer program;

The processor is configured to implement the method steps described in the present disclosure when executing the program stored in the memory.

In a sixth aspect, the present disclosure provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method steps described in the present disclosure are implemented.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

FIG1 is a schematic diagram of a networking structure of a wireless extended pico base station in the prior art;

FIG2 is a schematic diagram of a time domain or frequency domain proportional/weighted merging algorithm processing in the prior art;

FIG3 is a flow chart of a signal processing method according to an embodiment of the present disclosure;

FIG4 is a second flow chart of a signal processing method provided by an embodiment of the present disclosure;

FIG5 is a schematic diagram of a processing method for a multi-path frequency domain signal/baseband selection merging algorithm applicable to frequency domain multi-users in one embodiment of the present disclosure;

FIG6 is a schematic diagram of a network structure of a wireless extended pico base station in an example of the present disclosure;

FIG. 7 is one of the schematic diagrams of EU reporting in an example of the present disclosure;

FIG8 is a second schematic diagram of the networking structure of a wireless extended pico base station in an example of the present disclosure;

FIG9 is a second schematic diagram of EU reporting in an example of the present disclosure;

FIG10 is a schematic diagram of a structure of a signal processing device according to an embodiment of the present disclosure;

FIG11 is a second structural diagram of a signal processing device provided by an embodiment of the present disclosure; and

FIG. 12 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure.

Details

In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

In the prior art, a time domain or frequency domain proportional/weighted combining algorithm is used to combine the signals of all RRUs. Specifically, a schematic diagram of a time domain or frequency domain proportional/weighted combining algorithm is shown in FIG2 .

1. Time domain or frequency domain proportionality:

The formula for geometric merging is:

Wherein, Y represents the signal after EU merging, and _Xk represents the signal of each RRU before merging.

When using time domain or frequency domain geometric combining, since only some RRUs can receive the uplink UE's transmitted signal, after the signals of all RRUs or frequency domain signals are geometrically combined, for a certain UE, the noise and interference on the RRU that does not receive the UE signal will affect the overall combining effect, resulting in a decrease in performance after combining.

2. Weighted merging of time domain/frequency domain signals:

The formula for weighted merging is:

Using the RSSI of each RRU as a weighting factor and merging the overall time domain or frequency domain signals without distinguishing between frequency domain users will result in the RRU with a small allocated bandwidth having a lower weighting coefficient and the RRU with a large allocated bandwidth having a larger weighting coefficient. The result after merging will lead to a degradation in the demodulation performance of some UEs in the frequency division multi-user case.

FIG3 is a flow chart of a signal processing method provided by an embodiment of the present disclosure. As shown in FIG3 , the steps of the method include:

Step 302: the EU obtains a frequency domain signal converted from a time domain signal sent by N remote radio units RRUs, wherein the N RRUs are mounted under the EU, and the terminal UE is within the coverage of M RRUs among the N RRUs; M is a positive integer greater than 1, and M is less than or equal to N;

Step 304: the EU measures the signal strength within the bandwidth corresponding to the UE on the frequency domain signal to obtain a measurement result, wherein the measurement result includes a signal to interference plus noise ratio SINR under each RRU;

In step 306, the EU combines the top L SINRs selected from the measurement results, and sends the combined processing result and the equivalent SINR obtained based on the L SINRs to the baseband unit BBU, where the value of L is a positive integer greater than 1 and less than N.

In some embodiments, the conversion of the time-frequency signal can be: 1) After the RRU converts the RF signal into a baseband signal, it converts the time domain signal into a frequency domain signal and sends it to the EU. 2) The RRU sends the uplink baseband time domain signal to the EU, and the EU converts the baseband time domain signal into a frequency domain signal. That is, in the embodiments of the present disclosure, the conversion of the time-frequency signal can be performed by the RRU or by the EU.

Due to differences in the low noise and interference conditions of RRUs, different users are located in different RRU signal coverage areas, and differences in time-frequency offsets, the merging of EUs often results in large performance losses, which in turn causes problems in uplink demodulation and power control. Through the above steps 302 to 306, the EU first converts the time domain signal of the mounted RRU into a frequency domain signal. After unifying the signal, the EU first selects and merges the RRU signal based on the frequency domain signal, and then sends the merged result to the BBU, which performs the merge again. This improves the signal processing performance of the wireless extended pico base station network to a certain extent, and avoids the problem of large performance loss caused by merging all RRU signals and not distinguishing between time-frequency signals during merging.

In some implementations, measuring the signal strength of the EU involved in the above step 304 within the bandwidth range corresponding to the UE on the frequency domain signal includes:

Step 11, EU receives configuration data sent by BBU; and

Step 12: EU measures the signal strength within the bandwidth corresponding to the UE on the frequency domain signal based on the configuration data.

For the above steps 11 and 12, in some implementation schemes, the EU may receive the configuration data sent by the BBU, and perform SINR measurement on the frequency domain signals of the multiple RRUs under it according to the frequency domain bandwidth configured by the user, according to the user level. For each user, an RRU selection is performed within the EU, and one or more (for example, 1 to 4) RRUs with the largest SINR are selected.

In some implementation schemes, for the EU involved in the above step 306, L SINRs with the top SINR values selected from the measurement results are combined to obtain the combined processing result, which may further include:

Step 21, the EU compares each SINR in the measurement result with the target value to obtain a comparison result, wherein the target value is the difference between the SINR corresponding to the target MCS scheduled by the UE and the preset threshold value, and the comparison result includes valid RRUs and invalid RRUs, the valid RRUs are RRUs corresponding to the SINR greater than or equal to the target value, and the invalid RRUs are RRUs corresponding to the SINR less than the target value;

Step 22, the EU selects L RRUs from the valid RRUs;

Step 23, the EU determines a ratio of each SINR in the L SINRs to a sum of the L SINRs; and

Step 24: EU performs a merging process based on the ratio and the L SINRs to obtain a merging process result.

In certain implementation schemes, the above comparison result can be obtained based on the threshold judgment method of the following RRU/EU signal selection algorithm: E _SINR >Dtr _SINR -A, if the condition is met, it is selected as a valid RRU, otherwise it is an invalid RRU. E _SINR represents the measured SINR value; Dtr _SINR represents the SINR value corresponding to the target MCS (Modulation and Coding Scheme) of this user scheduling; wherein, MCS defines the number of valid bits that an RE (Resource Element) can carry. That is, MCS defines two parts, modulation scheme (Modulation) and code rate (Code Rate). In the specific example, there are a total of 0-31 MCS schemes, and the higher the MCS index, the higher the number of valid bits that can be carried. In addition, A is a preset threshold value, generally 0 to 12dB, which can be configured according to the maximum number of RRUs to be merged, for example, 4 RRUs can be configured as 6dB.

In this example, the value of L can be any number from 1 to 4.

In some implementation schemes, the ratio of the SINR corresponding to the effective RRU to the sum of the L SINRs is determined by the following formula:

in,

is the value of the i-th SINR among L SINRs, i ranges from 1 to k, k is L, max(SINR) represents the maximum SINR among L SINRs, SINR _i represents the i-th SINR among L SINRs, SUM(SINR) represents the sum of the selected L SINRs, and A is the preset threshold value;

In some embodiments, the combined processing result Y is obtained by the following formula in the example:

Wherein, _Xi is the i-th SINR among L SINRs.

In some implementations, an equivalent SINR may be obtained based on L SINRs by the following formula:

Among them, MSINR is the equivalent SINR, SUM(RSSI) represents the sum of RSSI (Received Signal Strength Indicator) corresponding to L SINRs, and SUM(NI) represents the sum of NI (Noise Index) corresponding to L SINRs.

FIG. 3 above is an explanation of the present disclosure from the EU side. The present disclosure will be explained from the BBU side below. As shown in FIG. 4 , the steps of the method for processing a signal on the BBU side include:

Step 402, the BBU receives the combined processing result sent by the first target EU and the equivalent SINR obtained by the first target EU based on L SINRs, wherein the combined processing result is obtained by combining L SINRs with the top SINR values selected by the first target EU from the measurement result, and the measurement result is obtained by measuring the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal, and the frequency domain signal is converted from the time domain signal sent by N RRUs mounted under the EU; the first target EU is any EU under the BBU; and

In step 404, the BBU combines the combined processing result and the equivalent SINR sent by the second target EU, and decodes the UE based on the combined processing result, wherein the second target EU is the EU corresponding to the M RRUs covering the UE.

It can be seen that in some implementation schemes, in addition to merging the frequency domain signals on the EU side, merging is also performed on the BBU side. Compared with the prior art in which signal selection and merging are performed only on the EU side, in the disclosed embodiment, merging is performed on both the EU and BBU sides to reduce the uplink signal quality loss caused by the algorithm in the prior art and improve the uplink combining gain.

In some embodiments, as shown in FIG. 5 , a multi-path frequency domain signal/baseband selection merging algorithm applicable to frequency domain multi-users is provided in the embodiment. In some embodiments, the steps of the algorithm include:

Step 501, converting the time domain signal of the RRU into a frequency domain signal;

Step 502, the EU completes the measurement and selection of multiple RRU signals under it;

Step 503, the EU performs channel estimation, antenna combining, and equalization on the RRU combined signal; and

Step 504, the BBU completes demodulation and decoding of the data;

In this regard, the time domain signal may be converted into a frequency domain signal in the following manner: after the RRU uplink converts the RF signal into a baseband signal, the time domain signal is converted into a frequency domain signal and sent to the EU; or the RRU sends the uplink baseband time domain signal to the EU, and the EU converts the baseband time domain signal into a frequency domain signal.

In some implementation schemes, the EU receives the configuration sent by the BBU, and measures the SINR of the frequency domain signals of the multiple RRUs under it according to the frequency domain bandwidth configured by the user, at the user level. For each user, the RRU selection within the EU is performed, and one or more (for example, 1 to 4) RRUs with the largest SINR are selected, and the multiple RRUs are merged according to the merging algorithm to calculate the equivalent merged SINR value.

In certain implementation schemes, the EU performs channel estimation, antenna combining, equalization, etc. on each selected RRU data according to the user, and soft-combines the data of multiple RRUs according to the user and sends them to the BBU.

In some implementations, the BBU performs EU selection on multiple EU data for each user in turn, and selects one or more (e.g., 1 to 4) data with the largest SINR. The BBU demodulates the selected user-level multiple EU data separately, and then merges and decodes the user-level demodulated data.

The above steps 501 to 504 are described below with reference to examples.

Example 1:

In the NR system, with a bandwidth of 100MHz, the network is shown in Figure 6. The BBU has 4 EUs, and each EU has 8 RRUs. UE1 is in the signal coverage of RRU22, and UE2 is in the signal coverage of RRU41. Among them, the BBU schedules 2 users in a certain TTI, namely UE1 and UE2; the RB resources allocated to UE1 at this moment are RB0~RB49, and the RB resources allocated to UE2 are RB50~RB272; the index of the MCS scheduled by UE1 at this moment is 24, and the corresponding SINR value is 30dB; the index of the MCS scheduled by UE2 is 25, and the corresponding SINR value is 34dB. The threshold difference A takes a value of 2dB. The system configuration selects the signal of 1 RRU and the signal of 1 EU.

The processing flow of the EU side in the above steps 501 to 503 may be:

1) EU ₁ receives the configuration sent by BBU and converts the received time domain signals of RRU ₁₁ to RRU ₁₈ into frequency domain signals. The signal strength within the bandwidth range of RB0 to RB49 on the frequency domain signals of RRU ₁₁ to RRU ₁₈ is measured to determine the signal strength of UE1. The signal strength within the bandwidth range of RB50 to RB272 on the frequency domain signals of RRU ₁₁ to RRU ₁₈ is measured to determine the signal strength of UE2. Assume that the measured signal strength of UE1 under RRU ₁₁ is the strongest, with an equivalent SINR of 0.5dB, and the signal strength of UE2 under RRU ₁₂ is the strongest, with an equivalent SINR of 0.6dB. EU ₁ selects RRU ₁₁ for UE1 user, and the corresponding α ₁ =0. For UE2 user, RRU ₁₂ is selected, and the corresponding α ₁ =0. EU ₁ determines that there is no valid data of UE1 according to α ₁ =0 of UE1, and determines that there is no valid data of UE2 according to α ₁ =0 of UE2, and then sends the data of UE1 and UE2 (no valid data, set to 0) to BBU.

2) EU ₂ receives the configuration sent by BBU and converts the received time domain signals of RRU ₂₁ ~ RRU ₂₈ into frequency domain signals. The signal strength within the bandwidth range of RB0 ~ RB49 on the frequency domain signals of RRU ₂₁ ~ RRU ₂₈ is measured to determine the signal strength of UE1. The signal strength within the bandwidth range of RB50 ~ RB272 on the frequency domain signals of RRU ₂₁ ~ RRU ₂₈ is measured to determine the signal strength of UE2. Assume that the measured signal strength of UE1 under RRU ₂₂ is the strongest, and the equivalent SINR is 32dB, and the signal strength of UE2 under RRU ₂₃ is the strongest, and the equivalent SINR is 0.6dB. EU ₂ selects RRU ₂₂ for UE1 user, and the corresponding α ₁ =1, and selects RRU ₂₃ for UE2 user, and the corresponding α ₁ =0. EU ₂ uses the frequency domain data of RRU ₂₂ to perform channel estimation, antenna combination and equalization on UE1, and determines that there is no valid data of UE2 according to α ₁ =0 of UE2, and then sends the equalized data of UE1 and the data of UE2 (no valid data, set to 0) to BBU.

3) EU ₃ receives the configuration sent by BBU and converts the received time domain signals of RRU ₃₁ to RRU ₃₈ into frequency domain signals. The signal strength within the bandwidth range of RB0 to RB49 on the frequency domain signals of RRU ₃₁ to RRU ₃₈ is measured to determine the signal strength of UE1. The signal strength within the bandwidth range of RB50 to RB272 on the frequency domain signals of RRU ₃₁ to RRU ₃₈ is measured to determine the signal strength of UE2. Assume that the measured signal strength of UE1 under RRU ₃₁ is the strongest, with an equivalent SINR of 0.5dB, and the signal strength of UE2 under RRU ₃₃ is the strongest, with an equivalent SINR of 0.6dB. EU ₃ selects RRU ₃₁ for UE1 user, and the corresponding α ₁ =0, and selects RRU ₃₃ for UE2 user, and the corresponding α ₁ =0. EU ₃ determines that there is no valid data of UE1 according to α ₁ =0 of UE1, and determines that there is no valid data of UE2 according to α ₁ =0 of UE2, and then sends the data of UE1 and UE2 (no valid data, set to 0) to BBU.

4) EU ₄ receives the configuration sent by BBU, and converts the received time domain signals of RRU ₄₁ ~ RRU ₄₈ into frequency domain signals. The signal strength within the bandwidth range of RB0 ~ RB49 on the frequency domain signals of RRU ₄₁ ~ RRU ₄₈ is measured to determine the signal strength of UE1. The signal strength within the bandwidth range of RB50 ~ RB272 on the frequency domain signals of RRU ₄₁ ~ RRU ₄₈ is measured to determine the signal strength of UE2. Assume that the measured signal strength of UE1 under RRU ₄₁ is the strongest, and the equivalent SINR is 0.5dB, and the signal strength of UE2 under RRU ₄₁ is the strongest, and the equivalent SINR is 36dB. EU ₄ selects RRU ₄₁ for UE1 user, and the corresponding α ₁ =0. For UE2 user, RRU ₄₁ corresponding to α ₁ =1 is selected. EU ₄ determines that there is no valid data of UE1 according to α ₁ =0 of UE1, performs channel estimation, antenna combination and equalization on UE2 using frequency domain data of RRU ₄₁ , and then sends the equalized data of UE1 (no valid data, set to 0) and UE2 to BBU.

In Example 1, the processing flow on the BBU side in step 504 is:

As shown in FIG7 , the BBU receives data from EU ₁ to EU ₄ , and selects the data of RRU ₂₂ under EU ₂ for UE1 to demodulate and decode; and selects the data of RRU ₄₁ under EU ₄ for UE2 to demodulate and decode.

It should be noted that UE1 and UE2 in the above Example 1 are respectively under the coverage of only one RRU. The following will use Example 2 to illustrate how to implement the signal merging method of the wireless indoor distributed system when UE1 and UE2 are under the coverage of multiple RRUs.

Example 2:

The network is shown in Figure 8. In the NR system, the bandwidth is 100MHz. BBU is connected to EU1, and EU1 is connected to 8 RRUs (RRU11 to RRU18) and EU2. EU2 is connected to 8 RRUs (RRU21 to RRU28). UE1 is mainly in the signal coverage of RRU18, and UE2 is mainly in the signal coverage of RRU22. In other words, UE1 and UE2 are also in the coverage of other RRUs.

In some implementation schemes, the BBU schedules two users in a certain TTI, namely UE1 and UE2; the RB resources allocated to UE1 at this moment are RB0~RB49, and the RB resources allocated to UE2 are RB50~RB272; the index of the MCS scheduled by UE1 at this moment is 24, and the corresponding SINR value is 30dB; the index of the MCS scheduled by UE2 is 25, and the corresponding SINR value is 32dB. The threshold difference A is 10dB. The system configuration selects the signals of 4 RRUs and 2 EUs.

The processing flow of the EU side in the above steps 501 to 503 may be:

1) EU1 Processing Flow

Assume that the SINRs of UE1 and UE2 of each RRU measured by EU1 are shown in Table 1 below.

Table 1

EU1 then calculates the α _i of UE1 and UE2 corresponding to each RRU under it as shown in Table 2 below.

Table 2

EU1 selects four RRUs for UE1, namely RRU ₁₅ , RRU ₁₆ , RRU ₁₇ , and RRU ₁₈ , and uses the frequency domain signals of these four RRUs to perform channel estimation, multi-antenna merging, and equalization on UE1; then the soft bit information of the four RRUs after equalization is merged:

The equivalent SINR of UE1 is calculated for the selected four RRUs. It is assumed that the calculated equivalent SINR of UE1 is 30 dB.

EU1 selects four RRUs for UE2, namely RRU ₁₅ , RRU ₁₆ , RRU ₁₇ , and RRU ₁₈ , and uses the frequency domain signals of these four RRUs to perform channel estimation, multi-antenna merging, and equalization on UE2; then the soft bit information of the four RRUs after equalization is merged.

The equivalent SINR of UE2 is calculated for the selected four RRUs. It is assumed that the calculated equivalent SINR of UE2 is 11.7 dB.

As shown in FIG8 , EU1 reports the combined data of UE1 and UE2 together with the equivalent SINR to the BBU.

2) EU2 Processing Flow

Assume that the SINRs of UE1 and UE2 of each RRU measured by EU2 are shown in Table 3 below.

table 3

EU2 then calculates the α _i of UE1 and UE2 corresponding to each RRU under it as shown in Table 4 below.

Table 4

EU2 selects four RRUs for UE1, namely RRU ₂₁ , RRU ₂₂ , RRU ₂₃ , and RRU ₂₈ , and uses the frequency domain signals of these four RRUs to perform channel estimation, multi-antenna merging, and equalization on UE1; then the soft bit information of the four RRUs after equalization is merged:

The equivalent SINR of UE1 is calculated for the selected four RRUs. It is assumed that the calculated equivalent SINR of UE1 is 12.3 dB.

EU2 selects four RRUs for UE2, namely RRU ₂₁ , RRU ₂₂ , RRU ₂₃ , and RRU ₂₄ , and uses the frequency domain signals of these four RRUs to perform channel estimation, multi-antenna merging, and equalization on UE2; then the soft bit information of the four RRUs after equalization is merged.

The equivalent SINR of UE2 is calculated for the selected four RRUs. It is assumed that the calculated equivalent SINR of UE2 is 32 dB.

As shown in FIG8 , EU2 reports the combined data of UE1 and UE2 together with the equivalent SINR to the BBU.

(3) EU3 Processing Flow

Assume that the SINRs of UE1 and UE2 of each RRU measured by EU3 are shown in Table 5 below.

table 5

EU3 then calculates the α _i of UE1 and UE2 corresponding to each RRU under it as shown in Table 6 below.

Table 6

EU3 selects four RRUs for UE1, namely RRU ₃₁ , RRU ₃₂ , RRU ₃₃ , and RRU ₃₄ , and uses the frequency domain signals of these four RRUs to perform channel estimation, multi-antenna merging, and equalization on UE1; then the soft bit information of the four RRUs after equalization is merged:

The equivalent SINR of UE1 is calculated for the selected four RRUs. It is assumed that the calculated equivalent SINR of UE1 is 7.7 dB.

EU3 selects four RRUs for UE2, namely RRU ₃₁ , RRU ₃₂ , RRU ₃₃ , and RRU ₃₄ , and uses the frequency domain signals of these four RRUs to perform channel estimation, multi-antenna merging, and equalization on UE2; then the soft bit information of the four RRUs after equalization is merged.

The equivalent SINR of UE2 is calculated for the selected four RRUs. It is assumed that the calculated equivalent SINR of UE2 is 13.5 dB.

As shown in FIG8 , EU3 reports the combined data of UE1 and UE2 together with the equivalent SINR to the BBU.

(4) EU4 Processing Flow

Assume that the SINRs of UE1 and UE2 of each RRU measured by EU4 are shown in Table 7 below.

Table 7

EU4 then calculates the α _i of UE1 and UE2 corresponding to each RRU under it as shown in Table 8 below.

Table 8

EU4 selects four RRUs for UE1, namely RRU ₄₁ , RRU ₄₂ , RRU ₄₃ , and RRU ₄₄ , and uses the frequency domain signals of these four RRUs to perform channel estimation, multi-antenna merging, and equalization on UE1; then the soft bit information of the four RRUs after equalization is merged:

The equivalent SINR of UE1 is calculated for the selected four RRUs. It is assumed that the calculated equivalent SINR of UE1 is 3.9 dB.

EU4 selects four RRUs for UE2, namely RRU ₄₁ , RRU ₄₂ , RRU ₄₃ , and RRU ₄₄ , and uses the frequency domain signals of these four RRUs to perform channel estimation, multi-antenna merging, and equalization on UE2; then the soft bit information of the four RRUs after equalization is merged.

The equivalent SINR of UE2 is calculated for the selected four RRUs. It is assumed that the calculated equivalent SINR of UE2 is 8.8 dB.

As shown in FIG9 , EU4 reports the combined data of UE1 and UE2 together with the equivalent SINR to the BBU.

In Example 2, the processing flow on the BBU side in step 504 is:

The BBU selects the data of EU1 and EU2 for UE1 (the physical location of UE1 is mainly within the signal coverage of RRU ₁₈ under EU ₁ , and the signal coverage of RRU under EU ₂ also covers the physical location of UE1), and merges the data of EU1 and EU2:

The combined data _Y1 is used to perform final decoding on UE1.

The BBU selects the data of EU2 and EU3 for UE2 (the physical location of UE2 is mainly within the signal coverage of RRU ₂₂ under EU ₂ , and the signal coverage of RRU under EU ₃ also covers the physical location of UE2), and merges the data of EU2 and EU3:

The combined data _Y2 is used to perform final decoding on UE2.

It should be noted that the embodiments of the present disclosure can be applied to multiple application scenarios, such as single-user scenarios and multi-user scenarios in the frequency domain, different BBU/EU segmentation scenarios, different EU/RRU segmentation scenarios, etc. In certain implementation schemes, through the configuration of the EU receiving BBU in the embodiments of the present disclosure, the measurement and selection of the frequency domain signals of the multiple RRUs hanging down are completed, the EU completes channel estimation, antenna merging, equalization, and calculation of equivalent SINR for the merged data of the RRU, and reports it to the BBU, and the BBU completes the selection, demodulation, merging and decoding of the EU reported data. In the specific experimental stage of the inventor, if the terminal uplink signal can be received by up to 4 pRRUs, the performance improvement of EU merging + BBU merging can reach 3 to 6dB.

Corresponding to the steps of the method in FIG. 3 above, the embodiment of the present disclosure further provides a signal processing device 100, which is applied to the EU side. As shown in FIG. 10 , the device 100 includes:

The acquisition module 102 is configured to acquire a frequency domain signal converted from a time domain signal sent by N remote radio units RRUs, wherein the N RRUs are mounted under the EU, and the terminal UE is within the coverage of M RRUs among the N RRUs; M is a positive integer greater than 1, and M is less than or equal to N;

The measurement module 104 is configured to measure the signal strength within the bandwidth corresponding to the UE on the frequency domain signal to obtain a measurement result, wherein the measurement result includes a signal to interference plus noise ratio SINR under each RRU; and

The first processing module 106 is configured to combine L SINRs with the top SINR values selected from the measurement results, and send the combined processing result and the equivalent SINR obtained based on the L SINRs to the BBU, where the value of L is a positive integer greater than 1 and less than N.

In certain embodiments, the measurement module 104 in the disclosed embodiment may further include: a receiving unit configured to receive configuration data sent by a baseband unit BBU; and a measuring unit configured to measure the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal based on the configuration data.

Through the device of the embodiment of the present invention, the EU first converts the time domain signal of the mounted RRU into a frequency domain signal. After unifying the signals, the EU first selects and merges the RRU signals based on the frequency domain signals, and then sends the merging results to the BBU, which performs merging again. This improves the signal processing performance of the wireless extended pico base station network to a certain extent, and avoids the problem in the prior art that the signals of all RRUs are merged and the time-frequency signals are not distinguished when merging, resulting in a large performance loss.

In certain embodiments, the first processing module 106 in the disclosed embodiment may further include: a comparison unit, configured to compare each SINR in the measurement result with a target value to obtain a comparison result, wherein the target value is the difference between the SINR corresponding to the target MCS scheduled by the UE and a preset threshold value, and the comparison result includes a valid RRU and an invalid RRU, the valid RRU is an RRU corresponding to an SINR greater than or equal to the target value, and the invalid RRU is an RRU corresponding to an SINR less than the target value; a selection unit, configured to select L RRUs from the valid RRUs; a determination unit, configured to determine the ratio of each SINR in the L SINRs to the sum of the L SINRs; a processing unit, configured to perform merging processing based on the ratio and the L SINRs to obtain a merging processing result.

In some implementations, the ratio of each of the L SINRs to the sum of the L SINRs is determined by the following formula:

in,

In some embodiments, the combined processing result Y is obtained by the following formula:

Wherein, _Xi is the i-th SINR among L SINRs.

In some implementations, the equivalent SINR is obtained based on the L SINRs by the following formula:

Among them, MSINR is the equivalent SINR, SUM(RSSI) represents the sum of the received signal strength indicators RSSI corresponding to L SINRs, and SUM(NI) represents the sum of the noise indexes NI corresponding to L SINRs.

Corresponding to the steps of the method in FIG. 4 above, the embodiment of the present disclosure further provides a signal processing device 110, which is applied to the BBU side. As shown in FIG. 11 , the device 110 includes:

The receiving module 112 is configured to receive the combined processing result sent by the first target EU and the equivalent SINR obtained by the first target EU based on L SINRs, wherein the combined processing result is obtained by combining the L SINRs with the top SINR values selected by the first target EU from the measurement result, and the measurement result is obtained by measuring the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal, and the frequency domain signal is obtained by converting the time domain signal sent by N RRUs mounted under the EU; the first target EU is any EU under the BBU;

The second processing module 11 is configured to combine the combined processing result and the equivalent SINR sent by the second target EU, and decode the UE based on the combined processing result, wherein the second target EU is the EU corresponding to the M RRUs covering the UE.

As shown in FIG. 12 , the embodiment of the present disclosure provides an electronic device 120, which includes a processor 121, a communication interface 122, a memory 123, and a communication bus 124, wherein the processor 121, the communication interface 122, and the memory 123 communicate with each other through the communication bus 124.

Memory 123, configured to store computer programs;

In certain embodiments, the processor 121, when configured to execute a program stored in the memory 123, implements the signal processing method provided by the present disclosure, and its role is similar and will not be described in detail here.

The embodiments of the present disclosure further provide a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the signal processing method provided in any one of the aforementioned method embodiments are implemented.

It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

A signal processing method, comprising:

The extension unit EU obtains a frequency domain signal converted from a time domain signal sent by N remote radio units RRU, wherein the N RRUs are mounted under the EU, and the terminal UE is within the coverage of M RRUs among the N RRUs; M is a positive integer greater than 1, and M is less than or equal to N;

The EU measures the signal strength within the bandwidth corresponding to the UE on the frequency domain signal to obtain a measurement result, wherein the measurement result includes a signal to interference plus noise ratio SINR under each of the RRUs; and

The EU combines L SINRs with the top SINR values selected from the measurement results, and sends the combined processing result and the equivalent SINR obtained based on the L SINRs to the baseband unit BBU, where the value of L is a positive integer greater than 1 and less than N.
The method of claim 1, wherein the EU measures the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal, comprising:

The EU receives the configuration data sent by the BBU; and

The EU measures the signal strength within the bandwidth corresponding to the UE on the frequency domain signal based on the configuration data.
The method according to claim 1 or 2, wherein the EU combines the top L SINRs selected from the measurement results, and obtaining the combined processing result includes:

The EU compares each SINR in the measurement result with a target value to obtain a comparison result, wherein the target value is the difference between the SINR corresponding to the target MCS scheduled by the UE and a preset threshold value, and the comparison result includes a valid RRU and an invalid RRU, the valid RRU is an RRU corresponding to an SINR greater than or equal to the target value, and the invalid RRU is an RRU corresponding to an SINR less than the target value;

The EU selects the L RRUs from the valid RRUs;

The EU determines a ratio of each of the L SINRs to a sum of the L SINRs; and

The EU performs a merging process based on the ratio and the L SINRs to obtain the merging process result.
The method according to claim 3, characterized in that the ratio of each SINR of the L SINRs to the sum of the L SINRs is determined by the following formula:

in,
is the value of the i-th SINR among L SINRs, i is 1 to k, k is L, max(SINR) represents the maximum SINR among the L SINRs, SINR i is the i-th SINR among the L SINRs, SUM(SINR) represents the sum of the selected L SINRs, and A is a preset threshold value.
The method according to any one of claims 1 to 4, wherein the combined processing result Y is obtained by the following formula:

Among them, Xi is the i-th SINR among the L SINRs.
The method according to any one of claims 1 to 4, wherein the equivalent SINR is obtained based on the L SINRs by the following formula:

Among them, MSINR is the equivalent SINR, SUM(RSSI) represents the sum of the received signal strength indication RSSI corresponding to the L SINRs respectively, and SUM(NI) represents the sum of the noise index NI corresponding to the L SINRs respectively.
A signal processing method, comprising:

The BBU receives a combined processing result sent by the first target EU and an equivalent SINR obtained by the first target EU based on L SINRs, wherein the combined processing result is obtained by combining L SINRs with the top SINR values selected by the first target EU from the measurement result, and the measurement result is obtained by measuring the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal, and the frequency domain signal is converted from the time domain signal sent by N RRUs mounted under the EU; the first target EU is any EU under the BBU; and

The BBU combines the combined processing result and the equivalent SINR sent by the second target EU, and decodes the UE based on the combined processing result, wherein the second target EU is the EU corresponding to the M RRUs covering the UE.
The signal processing device, which is applied to the EU side, includes:

An acquisition module is configured to acquire a frequency domain signal converted from a time domain signal sent by N remote radio units RRUs, wherein the N RRUs are mounted under the EU, and the terminal UE is within the coverage of M RRUs among the N RRUs; M is a positive integer greater than 1, and M is less than or equal to N;

a measurement module configured to measure the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal to obtain a measurement result, wherein the measurement result includes a signal to interference plus noise ratio SINR under each of the RRUs; and

The first processing module is configured to combine L SINRs with the top SINR values selected from the measurement results, and send the combined processing result and the equivalent SINR obtained based on the L SINRs to the baseband unit BBU, wherein the value of L is a positive integer greater than 1 and less than N.
A signal processing device, which is applied to the BBU side, comprises:

A receiving module, configured to receive a combined processing result sent by a first target EU and an equivalent SINR obtained by the first target EU based on L SINRs, wherein the combined processing result is obtained by combining L SINRs with the top SINR values selected by the first target EU from the measurement result, and the measurement result is obtained by measuring the signal strength within the bandwidth range corresponding to the UE on the frequency domain signal, and the frequency domain signal is converted from the time domain signal sent by N RRUs mounted under the EU; the first target EU is any EU under the BBU; and

The second processing module is configured to combine the combined processing result and the equivalent SINR sent by the second target EU, and decode the UE based on the combined processing result, wherein the second target EU is the EU corresponding to the M RRUs covering the UE.
An electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

a memory configured to store a computer program; and

A processor, when configured to execute a program stored in a memory, implements the method described in any one of claims 1 to 7.
A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.