CN111988856B - Multi-radio frequency unit baseband combining method of extension unit of 4G/5G distributed small base station - Google Patents
Multi-radio frequency unit baseband combining method of extension unit of 4G/5G distributed small base station Download PDFInfo
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- CN111988856B CN111988856B CN202010836087.1A CN202010836087A CN111988856B CN 111988856 B CN111988856 B CN 111988856B CN 202010836087 A CN202010836087 A CN 202010836087A CN 111988856 B CN111988856 B CN 111988856B
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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
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- 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
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Abstract
The invention discloses a multi-radio frequency unit baseband merging method of an extension unit of a 4G/5G distributed small base station, which is used for calculating the average signal-to-noise ratio (SNR) of pilot signals of each User Equipment (UE) on a physical layer resource block (PRB) scheduled by the User Equipment (UE) on each radio frequency unit (RU), 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 independently merging the IQ data into a frequency domain IQ data storage area of a single RU after uplink merging. The method of the invention does not cause the lifting of the background noise of the IQ data after uplink combination, improves the performance of a receiver at the side of a Data Unit (DU), 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 area of the distributed small base station, reduces the deployment cost and is beneficial to the large-scale popularization of the indoor and outdoor coverage of the 4G/5G small base station.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a multi-radio frequency unit baseband merging method of an extension unit of a 4G/5G distributed small base station.
Background
Referring to fig. 1-3,4G/5G NR distributed small base station, the main function of the extension Unit EU/Radio Hub is to complete the distribution of the downlink data of the Central Unit (CU) and the Data Unit (DU) to the IQ data of the multiple Radio Units (RU) and the uplink multiple Radio Units (RU), and after the time slots (slots) are aligned, the IQ data of the single RU is combined, and the IQ data combined into the single RU is uploaded to the cu+du through the eCPRI/CPRI interface. EU support several interfaces to CU, i.e. several EU cascade interfaces, and interfaces to 8 RU at most, EU support 25G optical interface or 10G optical interface upper interface, also support 10G electrical interface. Both 10G and 25G are ethernet ports supporting eCPRI protocols. In the conventional EU/Radio Hub device, 8 RUs are generally connected in parallel, uplink IQ data of the 8 RUs are converged at the EU side, time slots (slots) are aligned, and then the average value of the uplink IQ data is combined into IQ data of one RU, and the IQ data is sent to the CU/DU through a eCPRI interface of the EU/Radio Hub. The average value combination of the uplink IQ data of 8 RUs can bring the improvement of the bottom noise, and the performance of the DU side receiver is deteriorated.
The conventional EU/Radio Hub device is usually connected with 8 RUs in parallel, and the conventional multiple RUs and merging algorithm is as follows: the uplink IQ data of 8 RUs are aligned in time slot (slot), added, averaged and combined into frequency domain IQ data of a single RU, and sent to the CU/DU through eCPRI interfaces of an expansion unit EU/Radio Hub. However, the merging of the uplink IQ data of 8 RUs will bring about improvement of the background noise, which is 10×log10 (8) =9.03db in total, and as the number of RU connected in parallel increases, the background noise of the IQ data after merging will be increased, which seriously affects the receiving performance of the data unit DU receiver, so that at most 8 RUs are connected in parallel behind one extension unit EU. .
Disclosure of Invention
The invention aims to provide a multi-radio frequency unit baseband combining method of an extension unit of a 4G/5G distributed small base station aiming at the defects of the prior art.
In order to solve the problems, the invention adopts the following technical scheme:
a multi-radio frequency unit baseband combining method of an extension unit of a 4G/5G distributed small base station comprises the following steps:
S1, according to the scheduling information sent by layer two, in the current time slot, n users UE i are co-scheduled for i=1,..n, each user occupies a respective physical layer resource block nPRB i, the average signal-to-noise ratio of the pilot signal on the physical layer resource block nPRB of the radio frequency unit RU k k=1 is calculated The average signal-to-noise ratio/>, of the pilot signals of which radio frequency units RU are then comparedLarge, select/>The IQ data of the physical layer resource block nPRB i of the large radio frequency unit RU is combined into the data storage space of the frequency domain IQ data combined by the plurality of radio frequency units RU;
S2, and so on, merging the frequency domain IQ data of other user UE into the data storage area of the merged frequency domain IQ data.
Further, the average snr is calculated by the pilot signal of each UE i on its scheduled physical layer resource block PRBThe method of (2) is as follows:
s1, calculating channel estimation of pilot frequency, selecting pilot frequency data of a third symbol by using frequency domain data transmitted by a radio frequency unit RU through eCPRI/CPRI, and obtaining channel estimation containing noise after pilot frequency channel estimation by a least square method
S2, filtering out-of-band noise through a frequency domain filter, and marking the channel estimation of the out-of-band noise asNPRB i is the physical layer resource block scheduled by the UE i, M 0 is the number of subcarriers per PRB, M 0 =12, byAfter the in-band noise is calculated, the noise on each subcarrier is calculated through scaling factor conversion;
S3, calculating the total signal power of each PRB of the pilot signal and subtracting the noise power to obtain the useful signal power, and finally, the average signal-to-noise ratio of the pilot signal on the physical layer resource block scheduled by the UE i Calculating;
S4, the expansion unit EU/Radio Hub selects which IQ data of the physical layer resource block on each Radio frequency unit RU is combined into an IQ data storage area of the physical layer resource block after the combination of the Radio frequency units RU according to the average signal to noise ratio of pilot signals of the physical layer resource block scheduled by the user equipment iUE i on each Radio frequency unit RU.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the method calculates the average signal-to-noise ratio (SNR) of pilot signals of each User Equipment (UE) on a physical layer resource block (PRB) scheduled by the User Equipment (UE) on each radio frequency unit (RU), then selects 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 is singly combined into frequency domain IQ data of a single RU after uplink combination. The preferred merging method disclosed by the invention can not cause the lifting of the bottom noise of the IQ data after uplink merging, simultaneously improves the performance of a receiver at the DU side, increases the number of RUs which can be connected in parallel by each CU/DU of the 4G/5G distributed small base station, enlarges the coverage area of the distributed small base station, reduces the deployment cost and is beneficial to the large-scale popularization of the indoor and outdoor coverage of the 4G/5G small base station.
Drawings
Fig. 1 is a network topology diagram of a 5g NR sub6g distributed small cell;
FIG. 2 is a diagram of a 5G NR sub6G distributed small cell system architecture;
FIG. 3 is a schematic diagram of a method for merging uplink data of EU/Radio Hub units;
FIG. 4 shows an average signal-to-noise ratio based on the EU/Radio Hub of the present invention Schematic diagram of a preferred selection and combination method of multiple RU uplink frequency domain IQ data;
fig. 5 is a schematic diagram of calculating an average signal-to-noise ratio of each UE's scheduled physical layer resource block on each RU.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
A multi-radio frequency unit baseband combining method of an extension unit of a 4G/5G distributed small base station comprises the following steps:
S1, we take uplink shared physical channel (PUSCH channel) combining as an example, according to the scheduling information sent by layer two (L2), in the current Slot (Slot), n UEs i are co-scheduled for i=1, n, each UE i occupies a respective physical layer resource block nPRB i, and the average signal-to-noise ratio of the pilot signal on the physical layer resource block nPRB of the radio frequency unit RU k k=1 is calculated Then compares the/>, of the pilot signal of which radio frequency unit RULarge, select/>The IQ data of the physical layer resource block nPRB i of the large radio frequency unit RU is combined into the data storage space of the frequency domain IQ data after the multi radio frequency unit RU is combined, as shown in fig. 4.
S2, analogizing, the PUSCH frequency domain IQ data of other user UE are also combined into a data storage space (buffer) of the frequency domain IQ data of the single radio frequency unit RU after combination.
As shown in fig. 5, each user UE i calculates the average signal-to-noise ratio of the pilot signal on its scheduled physical layer resource block PRBThe method of (2) is as follows:
s1, calculating channel estimation of pilot frequency, selecting pilot frequency data of a third symbol by using frequency domain data transmitted by a radio frequency unit RU through eCPRI, and obtaining channel estimation containing noise after pilot frequency channel estimation by using a Least Square method (Least Square)
S2, filtering out-of-band noise through a frequency domain filter, and marking the channel estimation for filtering out-of-band noise asNPRB i is the physical layer resource block scheduled by the UE i, M 0 is the number of subcarriers per PRB, M 0 =12, byAfter the in-band noise is calculated, the noise on each subcarrier is calculated through scaling factor conversion;
S3, calculating the total signal power (useful signal power plus noise power) on each sub-carrier of each PRB of the pilot signal, subtracting the noise power to obtain the useful signal power, and finally, the average signal-to-noise ratio of the pilot signal on the physical layer resource block scheduled by the user equipment UE i Calculating;
S4, the expansion unit EU/Radio Hub is used for controlling the average signal-to-noise ratio of pilot signals on the physical layer resource blocks scheduled on each Radio frequency unit RU according to the user equipment UE i The size of the physical layer resource block on which radio frequency unit RU is selected, and the IQ data of the physical layer resource block is merged into the IQ data storage space of the physical layer resource block after the merging of the radio frequency units RU.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. The multi-radio frequency unit baseband combining method of the extension unit of the 4G/5G distributed small base station is characterized by comprising the following steps:
S1, according to the scheduling information sent by the second layer, in the current time slot, n users UE i, for i=1, … n are co-scheduled, each user occupies a respective physical layer resource block nPRB i, and the average signal-to-noise ratio of pilot signals on the physical layer resource blocks nPRB of the radio frequency units RU k k=1, … 8 is obtained through calculation The average signal-to-noise ratio/>, of the pilot signals of which radio frequency units RU are then comparedLarge, select/>The IQ data of the physical layer resource block nPRB i of the large radio frequency unit RU is combined into the data storage space of the frequency domain IQ data combined by the plurality of radio frequency units RU;
The pilot signal of each user UE i on its scheduled physical layer resource block PRB calculates the average signal-to-noise ratio The method of (2) is as follows:
S11, calculating channel estimation of pilot frequency, selecting pilot frequency data of a third symbol by using frequency domain data transmitted by a radio frequency unit RU through eCPRI/CPRI, and obtaining channel estimation containing noise after pilot frequency channel estimation by a least square method
S12, filtering out the out-of-band noise through a frequency domain filter, and marking the channel estimation of the out-of-band noise asIs the physical layer resource block scheduled by the UE i, M 0 is the number of subcarriers per PRB, M 0 =12, byAfter the in-band noise is calculated, the noise on each subcarrier is calculated through scaling factor conversion;
S13, calculating the total signal power of each PRB of the pilot signal and subtracting the noise power to obtain the useful signal power, and finally, the average signal-to-noise ratio of the pilot signal on the physical layer resource block scheduled by the user equipment UE i Calculating;
S14, an expansion unit EU/RadioHub selects IQ data of a physical layer resource block on each radio frequency unit RU according to the average signal to noise ratio of pilot signals of the user equipment iUE i on the physical layer resource block scheduled on each radio frequency unit RU, and the IQ data of the physical layer resource block is combined into an IQ data storage area of the physical layer resource blocks combined by the plurality of radio frequency units RU;
S2, and so on, merging the frequency domain IQ data of other user UE into the data storage area of the merged frequency domain IQ data.
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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 |
| 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 |
| CN113260074B (en) * | 2021-07-15 | 2022-04-22 | 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 |
| CN113766524A (en) * | 2021-09-01 | 2021-12-07 | 深圳市日海飞信信息系统技术有限公司 | Positioning method, device and equipment for expanding skin of wireless communication base station and skin base station |
| 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 |
| CN114039622B (en) * | 2021-11-06 | 2023-07-28 | 四川恒湾科技有限公司 | Method for realizing switching of synchronous surface between network ports on radio frequency unit |
| 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 |
| 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 |
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