CN111988856A - Multi-radio-frequency unit baseband combination method of extension unit of 4G/5G distributed small base station - Google Patents

Multi-radio-frequency unit baseband combination method of extension unit of 4G/5G distributed small base station Download PDF

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CN111988856A
CN111988856A CN202010836087.1A CN202010836087A CN111988856A CN 111988856 A CN111988856 A CN 111988856A CN 202010836087 A CN202010836087 A CN 202010836087A CN 111988856 A CN111988856 A CN 111988856A
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data
unit
physical layer
radio frequency
layer resource
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胡征
胡祖敏
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Taicang T&W Electronics Co Ltd
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Shanghai Jinjin Information Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • 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
    • H04L25/0224—Channel estimation using sounding signals
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Abstract

The invention discloses a multi-radio frequency unit baseband combination method of an extension unit of a 4G/5G distributed small base station, which comprises the steps of calculating the average signal-to-noise ratio (SNR) of a pilot signal on a physical layer resource block (PRB) scheduled by User Equipment (UE) on each radio frequency unit (RU) of each User Equipment (UE), then selecting IQ data of the physical layer resource block of the UE under the radio frequency unit (RU) corresponding to the maximum average signal-to-noise ratio according to the average signal-to-noise ratio, and separately combining the IQ data into a frequency domain IQ data storage area of a single RU after uplink combination. The method of the invention can not cause the lifting of the bottom noise of the IQ data after uplink combination, simultaneously improves the performance of a receiver at the Data Unit (DU) side, increases the number of radio frequency units (R) U which can be connected in parallel by each CU/DU and EU of the 4G/5G distributed small base station, enlarges the coverage range of the distributed small base station, reduces the deployment cost, and is beneficial to the large-scale popularization of indoor and outdoor coverage of the 4G/5G small base station.

Description

Multi-radio-frequency unit baseband combination method of extension unit of 4G/5G distributed small base station
Technical Field
The invention relates to the technical field of communication, in particular to a multi-radio-frequency unit baseband combination method for an extension unit of a 4G/5G distributed small base station.
Background
Referring to fig. 1-3, the extended Unit EU/Radio Hub of the 4G/5G NR distributed small cell base station mainly functions to complete downlink data distribution of a Central Unit (CU) and a Data Unit (DU) to IQ data of multiple Radio Units (RUs) and uplink multiple Radio Units (RUs), combine the aligned slots (slots) into IQ data of a single RU, and upload the IQ data combined into the single RU to the CU + DU through an eccri/CPRI interface. The EU supports a plurality of interfaces connected to the CU, namely a plurality of EU cascade interfaces, and at most 8 RUs interfaces, the EU supports a 25G optical interface or a 10G optical interface uplink interface, and also supports a 10G electrical interface. Both 10G and 25G are ethernet ports, supporting the eccri protocol. In a conventional EU/Radio Hub device, 8 RUs are usually connected in parallel, uplink IQ data of the 8 RUs are converged, slot (slot) aligned and then mean-combined to form IQ data of one RU on the EU side, and the IQ data is transmitted to a CU/DU through an eCPRI interface of the EU/Radio Hub. The average value combination of the uplink IQ data of 8 RUs will bring about the improvement of the bottom noise and the deterioration of the performance of the DU-side receiver.
The traditional extended unit EU/Radio Hub device usually connects 8 RUs in parallel, and the traditional multi-RU and merging algorithm are as follows: and aligning the time slots (slots) of the uplink IQ data of 8 RUs, adding, averaging and combining the uplink IQ data into frequency domain IQ data of a single RU, and sending the frequency domain IQ data to the CU/DU through an eCPRI interface of an EU/Radio Hub expansion unit. However, the merging of the uplink IQ data of 8 RUs brings an increase of the bottom noise, which is 10 × log10(8) ═ 9.03dB in total, and as the number of RUs connected in parallel increases, the bottom noise of the merged IQ data increases, which seriously affects the receiving performance of the data unit DU receiver, so that at most 8 RUs are connected in parallel behind an extended unit EU. .
Disclosure of Invention
The present invention aims to provide a multi-rf unit baseband combining method for an extension unit of a 4G/5G distributed small base station, in order to overcome the above-mentioned shortcomings in the prior art.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a multi-radio frequency unit baseband combination method of an extension unit of a 4G/5G distributed small base station comprises the following steps:
s1, according to the scheduling information from layer two, at presentIn a slot, a total of n user UEs are schedulediN, each user occupying a respective physical layer resource block nPRBiCalculating to obtain the radio frequency unit RUkAverage signal-to-noise ratio of pilot signals on physical layer resource blocks nPRB of 1
Figure BDA0002639751160000011
Then the average signal-to-noise ratio of the pilot signal of which radio frequency unit RU is compared
Figure BDA0002639751160000021
Large, select
Figure BDA0002639751160000022
Physical layer resource block nPRB of large radio unit RUiThe IQ data of the frequency domain IQ data are merged into a data storage space of the frequency domain IQ data merged by the multi-radio frequency unit RU;
and S2, repeating the steps, and merging the frequency domain IQ data of other users UE into the data storage area of the merged frequency domain IQ data.
Further technical proposal is that each user UEiCalculating an average signal-to-noise ratio of a pilot signal on its scheduled physical layer resource block, PRB
Figure BDA0002639751160000023
The method comprises the following steps:
s1, calculating the channel estimation of the pilot frequency, the radio frequency unit RU selects the pilot frequency data of the third symbol through the frequency domain data transmitted by the eCPRI/CPRI, and after the pilot frequency channel estimation by the least square method, the channel estimation containing the noise is obtained
Figure BDA0002639751160000024
S2, filtering out the out-of-band noise through a frequency domain filter, and recording the channel estimation of the out-of-band noise as
Figure BDA0002639751160000025
nPRBiIs the UEiScheduled physical layer resource blocks, M0For each PRB sub-carrier number, M 012, by
Figure BDA0002639751160000026
Calculating the noise in the band, and then calculating the noise on each subcarrier through the conversion of a scale factor;
s3, calculating the total signal power of each PRB sub-carrier of the pilot signal, subtracting the noise power to obtain the useful signal power, and finally obtaining the user equipment UEiAverage signal-to-noise ratio of pilot signal on scheduled physical layer resource block
Figure BDA0002639751160000027
Calculating out;
s4, EU/Radio Hub expansion unit based on user equipment iUEiSelecting the IQ data of the physical layer resource block on which radio frequency unit RU is scheduled according to the average signal-to-noise ratio of the pilot signals on the physical layer resource block scheduled on each radio frequency unit RU, and merging the IQ data into an IQ data storage area of the physical layer resource block after the plurality of radio frequency units RU are merged.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the method of the invention calculates the average signal-to-noise ratio (SNR) of the pilot signal on the physical layer resource block (PRB) scheduled by each User Equipment (UE) on each radio frequency unit (RU), then selects the IQ data of the physical layer resource block of the UE under the radio frequency unit (RU) corresponding to the maximum average signal-to-noise ratio according to the average signal-to-noise ratio, and separately combines the IQ data into the frequency domain IQ data of a single RU after uplink combination. The preferred combination method does not cause the lifting of the bottom noise of IQ data after uplink combination, simultaneously improves the performance of a receiver at a DU side, increases the number of RUs (radio access units) which can be connected in parallel for each CU/DU of a 4G/5G distributed small base station, enlarges the coverage range of the distributed small base station, reduces the deployment cost and is beneficial to the large-scale popularization of indoor and outdoor coverage of the 4G/5G small base station.
Drawings
Fig. 1 is a 5G NR sub6G distributed small cell network topology;
FIG. 2 is a system architecture diagram of a 5G NR sub6G distributed small cell base station;
FIG. 3 is a diagram illustrating a conventional method for combining uplink data of multiple RUs in an EU/Radio Hub extension unit;
FIG. 4 is the extended unit EU/Radio Hub of the present invention based on average SNR
Figure BDA0002639751160000031
A schematic diagram of a preferred selection and combination method of the plurality of RU uplink frequency domain IQ data;
fig. 5 is a diagram illustrating the calculation of the average signal-to-noise ratio of each UE's scheduled physical layer resource blocks on each RU.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
A multi-radio frequency unit baseband combination method of an extension unit of a 4G/5G distributed small base station comprises the following steps:
s1, taking the uplink shared physical channel (PUSCH) combination as an example, according to the scheduling information sent by layer two (L2), in the current Slot (Slot), a total of n user UEs are schedulediN, for each UEiOccupying respective physical layer resource blocks nPRBiCalculating to obtain the radio frequency unit RUkAverage signal-to-noise ratio of pilot signals on physical layer resource blocks nPRB of 1
Figure BDA0002639751160000032
And then comparing the pilot signals of which radio frequency units RU
Figure BDA0002639751160000033
Large, select
Figure BDA0002639751160000034
Physical layer resource block nPRB of large radio unit RUiThe IQ data of the frequency domain IQ data are merged into the data storage space of the frequency domain IQ data merged by the multi-radio unit RU,as shown in fig. 4.
S2, and so on, merging the PUSCH frequency domain IQ data of other users UE into the data storage space (buffer) of the frequency domain IQ data of the merged single radio unit RU.
As shown in FIG. 5, each user UEiCalculating an average signal-to-noise ratio of a pilot signal on its scheduled physical layer resource block, PRB
Figure BDA0002639751160000035
The method comprises the following steps:
s1, calculating channel estimation of pilot frequency, the radio frequency unit RU selects the pilot frequency data of the third symbol through the frequency domain data transmitted by eCPRI, and obtains the channel estimation containing noise after the Least Square method (Least mean Square) pilot frequency channel estimation
Figure BDA0002639751160000036
S2, filtering out the out-of-band noise through a frequency domain filter, and recording the channel estimation for filtering out the out-of-band noise as
Figure BDA0002639751160000037
nPRBiIs the UEiScheduled physical layer resource blocks, M0For each PRB sub-carrier number, M 012, by
Figure BDA0002639751160000041
Calculating the noise in the band, and then calculating the noise on each subcarrier through the conversion of a scale factor;
s3, calculating the total signal power (useful signal power plus noise power) of each sub-carrier of each PRB of the pilot signal, subtracting the noise power to obtain the useful signal power, and finally obtaining the user equipment UEiAverage signal-to-noise ratio of pilot signal on scheduled physical layer resource block
Figure BDA0002639751160000042
Calculating out;
s4, extension Unit EURadio Hub according to user equipment UEiAverage signal-to-noise ratio of pilot signal on physical layer resource block scheduled on each radio frequency unit RU
Figure BDA0002639751160000043
Selecting which IQ data of the physical layer resource block on the radio frequency unit RU is merged into the IQ data storage space of the physical layer resource block merged by the plurality of radio frequency units RU.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (2)

1. A multi-radio frequency unit baseband combination method of an extension unit of a 4G/5G distributed small base station is characterized by comprising the following steps:
s1, according to the scheduling information from layer two, a total of n user UE are scheduled in the current time slotiN, each user occupying a respective physical layer resource block nPRBiCalculating to obtain the radio frequency unit RUkAverage signal-to-noise ratio of pilot signals on physical layer resource blocks nPRB of 1
Figure FDA0002639751150000014
Then the average signal-to-noise ratio of the pilot signal of which radio frequency unit RU is compared
Figure FDA0002639751150000012
Large, select
Figure FDA0002639751150000013
Physical layer resource block nPRB of large radio unit RUiThe IQ data of the frequency domain IQ data are merged into a data storage space of the frequency domain IQ data merged by the multi-radio frequency unit RU;
and S2, repeating the steps, and merging the frequency domain IQ data of other users UE into the data storage area of the merged frequency domain IQ data.
2. The multi-radio unit baseband combining method of the extension unit of 4G/5G distributed small cell base station as claimed in claim 1, wherein each user UEiCalculating an average signal-to-noise ratio of a pilot signal on its scheduled physical layer resource block, PRB
Figure FDA0002639751150000018
The method comprises the following steps:
s1, calculating the channel estimation of the pilot frequency, the radio frequency unit RU selects the pilot frequency data of the third symbol through the frequency domain data transmitted by the eCPRI/CPRI, and after the pilot frequency channel estimation by the least square method, the channel estimation containing the noise is obtained
Figure FDA0002639751150000015
S2, filtering out the out-of-band noise through a frequency domain filter, and recording the channel estimation of the out-of-band noise as
Figure FDA0002639751150000016
nPRBiIs the UEiScheduled physical layer resource blocks, M0For each PRB sub-carrier number, M012, by
Figure FDA0002639751150000011
Calculating the noise in the band, and then calculating the noise on each subcarrier through the conversion of a scale factor;
s3, calculating the total signal power of each PRB sub-carrier of the pilot signal, subtracting the noise power to obtain the useful signal power, and finally obtaining the user equipment UEiAverage signal-to-noise ratio of pilot signal on scheduled physical layer resource block
Figure FDA0002639751150000017
Calculating out;
s4, EU/radio hub expansion unit based on user equipment iUEiSelecting the IQ data of the physical layer resource block on which radio frequency unit RU is scheduled according to the average signal-to-noise ratio of the pilot signals on the physical layer resource block scheduled on each radio frequency unit RU, and merging the IQ data into an IQ data storage area of the physical layer resource block after the plurality of radio frequency units RU are merged.
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CN112702753A (en) * 2021-03-24 2021-04-23 四川创智联恒科技有限公司 Method, device, equipment and storage medium for automatic configuration recovery of communication radio frequency unit
CN113260074A (en) * 2021-07-15 2021-08-13 成都爱瑞无线科技有限公司 Uplink data processing method, system, device, equipment and storage medium
CN113709877A (en) * 2021-08-12 2021-11-26 联想(北京)有限公司 Information processing method and device, communication equipment and storage medium
CN113709813A (en) * 2021-09-03 2021-11-26 上海中兴易联通讯股份有限公司 Method and system for combining NR small base station base bands
CN113795044A (en) * 2021-09-15 2021-12-14 深圳市佳贤通信设备有限公司 UE baseband combination method, system, computer equipment and storage medium
CN114039622A (en) * 2021-11-06 2022-02-11 四川恒湾科技有限公司 Method for realizing switching of synchronization plane between network ports on radio frequency unit
CN114389657A (en) * 2022-02-15 2022-04-22 赛特斯信息科技股份有限公司 Multi-RRU cell wireless network based on multi-base-band combined macro diversity
CN114449534A (en) * 2022-02-15 2022-05-06 赛特斯信息科技股份有限公司 Multi-RRU cell wireless network based on base band merging macro diversity
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WO2022109952A1 (en) * 2020-11-26 2022-06-02 华为技术有限公司 Uplink signal sending method, and apparatus
CN112702753A (en) * 2021-03-24 2021-04-23 四川创智联恒科技有限公司 Method, device, equipment and storage medium for automatic configuration recovery of communication radio frequency unit
CN112702753B (en) * 2021-03-24 2021-06-08 四川创智联恒科技有限公司 Method, device, equipment and storage medium for automatic configuration recovery of communication radio frequency unit
CN113260074A (en) * 2021-07-15 2021-08-13 成都爱瑞无线科技有限公司 Uplink data processing method, system, device, equipment and storage medium
CN113709877A (en) * 2021-08-12 2021-11-26 联想(北京)有限公司 Information processing method and device, communication equipment and storage medium
CN113709813A (en) * 2021-09-03 2021-11-26 上海中兴易联通讯股份有限公司 Method and system for combining NR small base station base bands
CN113795044A (en) * 2021-09-15 2021-12-14 深圳市佳贤通信设备有限公司 UE baseband combination method, system, computer equipment and storage medium
CN114039622A (en) * 2021-11-06 2022-02-11 四川恒湾科技有限公司 Method for realizing switching of synchronization plane between network ports on radio frequency unit
CN114389657A (en) * 2022-02-15 2022-04-22 赛特斯信息科技股份有限公司 Multi-RRU cell wireless network based on multi-base-band combined macro diversity
CN114449534A (en) * 2022-02-15 2022-05-06 赛特斯信息科技股份有限公司 Multi-RRU cell wireless network based on base band merging macro diversity
CN114389657B (en) * 2022-02-15 2023-02-28 赛特斯信息科技股份有限公司 Multi-RRU cell wireless network based on multi-base-band combined macro diversity
CN114449534B (en) * 2022-02-15 2023-09-08 赛特斯信息科技股份有限公司 Multi-RRU cell wireless network based on baseband combining macro diversity

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