CN114389657A - Multi-RRU cell wireless network based on multi-base-band combined macro diversity - Google Patents
Multi-RRU cell wireless network based on multi-base-band combined macro diversity Download PDFInfo
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- CN114389657A CN114389657A CN202210135906.9A CN202210135906A CN114389657A CN 114389657 A CN114389657 A CN 114389657A CN 202210135906 A CN202210135906 A CN 202210135906A CN 114389657 A CN114389657 A CN 114389657A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a multi-RRU cell wireless network based on multi-base-band merging macro diversity, which has high transmission reliability and high transmission rate. The invention relates to a multi-RRU cell wireless network based on multi-base band merging macro diversity, which comprises the following steps: the system comprises a baseband processing unit (1), an extension unit (2) and a plurality of remote radio frequency units (3); the expansion unit (2) is internally split into a first sub expansion unit (21), a second sub expansion unit (22), a third sub expansion unit (23) and a fourth sub expansion unit (24), and the first to fourth sub expansion units (21, 22, 23, 24) are independent of each other; each sub-extension unit is connected with at most 2 remote radio frequency units (3) by signals.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a multi-RRU cell wireless network based on multi-base-band merging macro diversity.
Background
The multi-RRU cell combining is to combine a plurality of RRUs (Remote Radio units) into one cell. In this Cell, all RRUs use the same PCI (Physical Cell Identifier). The cell adopts RRU joint scheduling, namely a downlink physical channel adopts multi-RRU joint transmission, and an uplink physical channel adopts all reception and selective reception. The multi-RRU joint transmission means that a plurality of RRUs in a cell simultaneously transmit the same data on the same time-frequency resource through joint scheduling.
Compared with a networking mode that each RRU is a cell in the common situation, the control channels of the RRUs in the cell combined by the RRUs have no interference, and instead, gain can be obtained through joint transmission.
As shown in fig. 1, a multi-RRU cell wireless network formed by combining multiple existing RRU cells includes a baseband processing Unit (BU), multiple Expansion Units (EU), and multiple Remote Radio Units (RRUs); each baseband processing unit is connected with 4 extension unit signals at most, and each extension unit is connected with 8 remote radio frequency unit signals at most.
The multi-RRU cell wireless network is a network in which a multi-RRU single cell is formed by performing radio frequency combining on an EU (extension Unit) and performing a baseband combining process on a physical layer of a BBU (Building Base band Unit). Since each EU can support the radio frequency combining capability of 8 RRUs at maximum, the BBU physical layer supports the base band combining capability of 4 EUs, and thus a single cell can support the cell combining of 32 RRUs at maximum. And after the uplink and the downlink of a plurality of EUs are accurately synchronized, the baseband combination utilizes the MIMO technology to form macro diversity combination. And the RRU between EUs improves the channel gain and the data throughput through an uplink and downlink MIMO channel multiplexing and diversity technology.
However, the multi-RRU cell radio network has the problems of insufficient transmission reliability and insufficient transmission rate due to the combination of multiple RRU data and the increase of background noise and radio frequency interference between the RRUs.
Disclosure of Invention
The invention aims to provide a multi-RRU cell wireless network based on multi-base-band merging macro diversity, which has high transmission reliability and high transmission rate.
The technical solution for realizing the purpose of the invention is as follows:
a multi-RRU cell wireless network based on multi-base band merging macro diversity comprises: a baseband processing unit 1, an extension unit 2, a plurality of remote radio frequency units 3; the expansion unit 2 is internally split into a first sub-expansion unit 21, a second sub-expansion unit 22, a third sub-expansion unit 23 and a fourth sub-expansion unit 24, and the first to fourth sub-expansion units 21, 22, 23 and 24 are independent of each other; each sub-extension unit is connected with at most 2 remote radio units 3.
Compared with the prior art, the invention has the following remarkable advantages:
the transmission reliability is high, the speed is fast: the invention connects BBU with a plurality of extension units EU, and each EU is divided into two independent sub-extension units. The RRUs in independent areas under a single EU and the RRUs belonging to different EUs execute base band macro diversity combination, and diversity gain and multiplexing gain are provided through enhancement of an MIMO technology, so that transmission reliability of a system is guaranteed, and transmission rate of the system is improved. When the number of the RRUs in the single cell in the network arrangement is less than 8, EU resources are saved, and the transmission reliability and the data throughput are improved.
The invention is described in further detail below with reference to the figures and the detailed description.
Drawings
Fig. 1 is a block diagram of a structure of cell merging of multiple RRUs in the prior art.
Fig. 2 is a block diagram of a multi-RRU cell wireless network based on multi-baseband combining macro diversity according to the present invention.
Detailed Description
As shown in fig. 2, the structural block diagram of the multi-RRU cell wireless network based on multi-baseband combining macro diversity of the present invention includes:
a baseband processing unit 1, an extension unit 2, a plurality of remote radio frequency units 3;
the expansion unit 2 is internally split into a first sub-expansion unit 21, a second sub-expansion unit 22, a third sub-expansion unit 23 and a fourth sub-expansion unit 24, and the first to fourth sub-expansion units 21, 22, 23 and 24 are independent of each other;
each sub-extension unit is connected with at most 2 remote radio units 3.
Preferably, the fronthaul card of the baseband processing unit 1 is connected with the extension unit 2 through a 10G optical fiber.
Preferably, 2 remote radio units 3 connected to the same sub-extension unit are located in the same independent area within the cell.
And the 2 remote radio frequency units 3 in the same independent area in the cell execute baseband macro diversity combining, and the combined data selects 2 paths of data with the highest channel quality according to the SRS measurement result to realize the baseband macro diversity combining on a physical layer, and is enhanced by an MIMO technology.
The invention executes EU splitting in EU, based on the maximum capacity of 25G light transmission, the EU is split into 4 independent extension units, each independent EU unit transmits 2-antenna data, and transmits NR data of 8 antennas in total, RRUs in independent areas under a single EU execute radio frequency combination, the combined data selects 2 paths of data with the highest channel quality according to SRS measurement results to realize baseband macro diversity combination on a physical layer, diversity gain and multiplexing gain are provided through the enhancement of MIMO technology, the transmission reliability of a system is ensured, and the transmission rate of the system is improved. When the number of the RRUs in the single cell in the network arrangement is less than 8, the invention saves EU resources and improves the transmission reliability and data throughput.
The forward card and expansion unit 25G performs data transmission by light, and can transmit NR 4 cell (8 antenna) data at maximum. The extended unit EU is split into 4 independent units, each unit comprises 2 optical ports and 2 RRUs with 2 antennas, data after 2 RRU radio frequency combination in each independent EU unit is transmitted to a forward transmission unit, and macro diversity baseband combination is executed on a physical layer.
Preferably, each remote radio unit 3 is provided with 2 antennas.
And when the UE finishes the access process, starting SRS scheduling. And the physical layer receives SRS data, and the SNR of the data is higher than that of the data after radio frequency combination of each independent unit of EU. And selecting two paths of uplink data with the highest signal-to-noise ratio to perform baseband combination by using an MIMO technology.
The channel quality is judged through the SRS, two paths of data with the highest SNR (two antennas for each RRU, two RRUs are equivalent to 4 antennas) are selected to execute MIMO, 4 transmitting antennas and 4 receiving antennas are respectively selected at a transmitting end and a receiving end, signals are transmitted and received through the transmitting end and the receiving end through the multiple antennas, and therefore the communication quality is improved. The multi-antenna multi-transmission multi-receiving system can fully utilize space resources, realize multi-transmission and multi-reception through a plurality of antennas, and improve the system channel capacity by times under the condition of not increasing frequency spectrum resources and antenna transmitting power.
Claims (4)
1. A multi-RRU cell wireless network based on multi-base band merging macro diversity is characterized by comprising the following steps:
the system comprises a baseband processing unit (1), an extension unit (2) and a plurality of remote radio frequency units (3);
the expansion unit (2) is internally split into a first sub expansion unit (21), a second sub expansion unit (22), a third sub expansion unit (23) and a fourth sub expansion unit (24), and the first to fourth sub expansion units (21, 22, 23, 24) are independent of each other;
each sub-extension unit is connected with at most 2 remote radio frequency units (3) by signals.
2. The multi-RRU cell wireless network of claim 1, wherein:
and the forward card of the baseband processing unit (1) is connected with the expansion unit (2) through a 10G optical fiber.
3. The multi-RRU cell wireless network of claim 1, wherein:
2 remote radio frequency units (3) connected with the same sub-extension unit are in the same independent area in the cell.
4. The multi-RRU cell wireless network of claim 3, wherein:
each remote radio unit (3) is provided with 2 antennas.
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| CN202210135906.9A CN114389657B (en) | 2022-02-15 | 2022-02-15 | Multi-RRU cell wireless network based on multi-base-band combined macro diversity |
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