CN101237629A - A remote RF hub based on digital middle frequency transmission - Google Patents

A remote RF hub based on digital middle frequency transmission Download PDF

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Publication number
CN101237629A
CN101237629A CNA2007100029599A CN200710002959A CN101237629A CN 101237629 A CN101237629 A CN 101237629A CN A2007100029599 A CNA2007100029599 A CN A2007100029599A CN 200710002959 A CN200710002959 A CN 200710002959A CN 101237629 A CN101237629 A CN 101237629A
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CN
China
Prior art keywords
digital
data
circuit
frequency
remote
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Pending
Application number
CNA2007100029599A
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Chinese (zh)
Inventor
高嵩
廖娟
梅刚
程晓梅
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ZTE Corp
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ZTE Corp
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Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CNA2007100029599A priority Critical patent/CN101237629A/en
Publication of CN101237629A publication Critical patent/CN101237629A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a networking technology in a wireless cellular system, in particular to a remote radio concentrator based on a digital intermediate frequency transmission. The remote radio concentrator comprises a physical interface and a digital intermediate frequency processing circuit which are connected with remote radio equipment and base band equipment respectively, wherein the physical interface which is connected with the remote radio equipment is used for carrying digital intermediate frequency data in the upstream and downstream and monitoring control data; the physical interface which is connected to the base band equipment is used for carrying base band data and controlling monitoring information; the digital intermediate frequency processing circuit is used for exchanging the upstream digital intermediate frequency signals into base band data and exchanging the downstream base band data into digital intermediate frequency signals. The remote radio concentrator of the invention is provided with the digital intermediate frequency processing function on the basis of the prior functions, and the digital intermediate frequency signals are trunked into the remote radio concentrator for processing, which not only is advantageous to the optimization and management of design resource but also increases integration of a circuit and reduces the general design cost.

Description

A kind of remote RF hub based on the digital intermediate frequency transmission
Technical field
The present invention relates to the networking technology in the wireless cellular system, be specifically related to a kind of remote RF hub based on the digital intermediate frequency transmission.
Background technology
Base station equipment is in the front end of Access Network in wireless cellular system, base station equipment quantity in whole system is more, and the different designs structure of base station equipment is to the cost of the whole network, the convenience of construction, and the performance of network all has bigger influence.
Base station equipment can be divided into outdoor version base station and indoor type base station according to the environment of applications difference.Divide two kinds of the base station that can be divided into integrated-type and distributed base stations according to the system configuration of base station.
The base station of integrated-type is integrated Iub interface, Base-Band Processing, functions such as radio frequency processing are one, realize the function of a complete base station in an equipment machine frame or frame.
Distributed base station is the function of whole base station to be assigned in several equipment finish, and each equipment is finished certain part of functions, between the equipment by optical fiber, cable, transmission means swap data such as wireless.Advantages such as this distributed structure is because of flexible configuration, and is easy for installation, and cost is lower have obtained bigger development in recent years.
The common structure of distributed base station is that baseband pool (BBU) adds radio frequency remote equipment (RRU) two parts, wherein baseband pool is finished work such as Iub interface, Base-Band Processing, radio frequency remote equipment is mainly realized the mutual conversion between base band and the radiofrequency signal, usually the installation site of the close more antenna of radio frequency remote equipment.Between baseband pool and the radio frequency remote equipment by the various wired or wireless transmission of carrying out data and clock that are connected.
Existing radio frequency remote equipment mainly contains two kinds: a kind of radio frequency remote equipment that is based on the baseband transmission mode, what transmit on the physical interface of this remote device and baseband pool is base band data, carry out Digital IF Processing, AD/DA conversion and analog radio frequency and handle in radio frequency remote equipment, the radio frequency remote equipment of this structure is used wider at present.
A kind of radio frequency remote equipment that is based on analog intermediate frequency, what transmit on the physical interface of this remote device and baseband pool is analog if signal.Radio frequency remote equipment finish analog signal on the functions such as amplification filtering of down-conversion, signal.A shortcoming of this remote device is that mounting points can not be too far away from baseband pool, otherwise the analog signal on the interface bigger decay can take place and introduces more noise.
In nearest development, a kind of derived structure has appearred in the radio frequency stretch system based on baseband transmission, promptly between baseband pool and radio frequency remote equipment, increase a remote RF hub (RRU-HUB), this remote RF hub mainly finish the IQ data exchange, IQ data close the road along separate routes, to functions such as radio frequency remote equipment power supplies.The increase radio frequency zooms out HUB can make the network planning, cell configuration etc. more flexible.What transmit on the interface in this network configuration between remote RF hub and the radio frequency remote equipment remains base band data.
Radio frequency remote equipment relatively disperses owing to quantity installation site more, equipment, therefore simplify the function of radio frequency remote equipment as far as possible, reduce the power consumption of radio frequency remote equipment, the reliability that improves radio frequency remote equipment is the subject matter that present far-drawing system need solve.
And the position that remote RF hub is placed is easier to centralized maintenance usually, therefore simplifies radio frequency remote equipment as far as possible, and as much as possible function is put into to realize it being the effective means that increases total system reliability, maintainability in the remote RF hub.
Summary of the invention
In order to solve problems of the prior art, the present invention proposes a kind of remote RF hub based on the digital intermediate frequency transmission, and the structure of existing remote RF hub is transformed, and increases the Digital IF Processing function on the basis of original function.The coffret of remote RF hub and radio frequency remote equipment is not the transmission base band data, but the transmission of digital intermediate frequency data.
The present invention specifically is achieved in that
A kind of remote RF hub based on digital intermediate frequency transmission comprises respectively the physical interface that is connected with baseband pool with radio frequency remote equipment, and the described physical interface that is connected with radio frequency remote equipment is in order to carry up-downgoing digital intermediate frequency data and Monitoring and Controlling data; The described physical interface that is connected with baseband pool is in order to carrying base band data and control detection information; Also comprise:
The Digital IF Processing circuit arrives the conversion of base band data and the conversion that the downgoing baseband data arrive digital medium-frequency signal in order to finish the upstream digital intermediate-freuqncy signal.
Described remote RF hub based on digital intermediate frequency transmission also comprises: the cross over circuit of data, up-downgoing data close the road shunt circuit;
The cross over circuit of described data is finished the interconnection of multichannel data;
The up-downgoing data close the road shunt circuit, finish the shunt function of closing road and downlink data of upstream data;
The cross over circuit of described data, an end is connected by physical interface with the base band battery, and the other end connects digital intermediate-frequency circuit;
Described up-downgoing data close the road shunt circuit, an end is connected by physical interface with radio frequency remote equipment, the other end connects digital processing circuitry of intermediate frequency.
The cross over circuit of described data and up-downgoing data close the road shunt circuit, can be positioned at before the Digital IF Processing circuit or afterwards.
The cross over circuit of described data and up-downgoing data close the order scalable of road shunt circuit in circuit.
Remote RF hub based on the digital intermediate frequency transmission of the present invention has increased the Digital IF Processing function on the function of original hub, Digital IF Processing is focused on remote RF hub handle.This design can focus on digital intermediate frequency, helps the optimization and the management of design resource, and the benefit that focuses on digital intermediate frequency is the integrated level that helps improving circuit, reduces overall design cost.
Description of drawings
Fig. 1 is the structure of the remote RF hub based on baseband interface of the prior art;
Fig. 2 is a kind of structure of the remote RF hub based on digital intermediate frequency transmission of the present invention;
Fig. 3 is a kind of structure of the remote RF hub based on digital intermediate frequency transmission of the present invention;
Fig. 4 is a kind of structure of the remote RF hub based on digital intermediate frequency transmission of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is based on the structural representation of the remote RF hub (RRU-HUB) of baseband interface in the prior art.The present invention is directed to this structure and improve, increased the Digital IF Processing function, with the RRU physical interface on what transmit is the digital intermediate frequency data.
Remote RF hub of the present invention comprises physical interface, Digital IF Processing circuit and the physical interface that is connected with baseband pool that is connected with radio frequency remote equipment.The content of the physical interface carrying between described remote RF hub and the radio frequency remote equipment comprises up-downgoing digital intermediate frequency data and Monitoring and Controlling data.The content of the physical interface carrying between described remote RF hub and the baseband pool mainly comprises base band data and control detection information.Described Digital IF Processing circuit is finished the upstream digital intermediate frequency and is arrived the conversion of base band and the conversion that the downgoing baseband data arrive digital medium-frequency signal.
What remote RF hub can also comprise the cross over circuit of data and up-downgoing data closes the road shunt circuit.This two parts circuit is an optional part of the present invention.The cross over circuit of data is finished the interconnection of multichannel data.The up-downgoing data close the shunt function of closing road and downlink data that the road shunt circuit is mainly finished upstream data.
Fig. 2 is the structural representation of the remote RF hub based on digital intermediate frequency transmission of the present invention.As shown in the figure, with what receive in the BBU physical interface 121 is descending base band data, descending base band data carries out processings such as Digital Up Convert and becomes the digital intermediate frequency data through entering Digital IF Processing 123 circuit after the interconnection 122, and the digital intermediate frequency data are distributed on the physical interface 126 different and RRU through data shunt 124 circuit.The digital intermediate frequency data that the up physical interface 126 from RRU receives are closed through data and are delivered to Digital IF Processing 123 circuit after handle on road 125 and carry out Digital Down Convert, the base band data after the Digital Down Convert behind interconnection 122 circuit by being sent to baseband pool BBU with the BBU physical interface.
Circuit as shown in Figure 2 be in proper order with radio frequency remote equipment between physical interface after be connected the up-downgoing data close the road shunt circuit, be the Digital IF Processing circuit then, be cross over circuit then, be baseband processing circuitry at last.The benefit of doing like this is that the only involutory circuit-switched data of Digital IF Processing circuit is handled, and can reduce the scale of circuit.
This two parts circuit can also can be positioned at before the Digital IF Processing circuit or afterwards as shown in Figure 3 and Figure 4, and the sequencing of this two parts circuit also can be regulated.
Digital IF Processing 123 circuit have been placed on the front of interconnection 122 circuit in the system configuration of Fig. 3, and this structure has increased with respect to the processing speed of structure interconnection 122 circuit of Fig. 2, can increase the live load of interconnection 122 circuit.
Digital IF Processing 123 circuit have been placed on the front with RRU physical interface 126 in circuit shown in Figure 4, and so, the way of Digital IF Processing may increase.
Remote RF hub based on the digital intermediate frequency transmission of the present invention, the described in addition radio frequency remote equipment of system configuration that includes but not limited to Fig. 3 and Fig. 4 also comprises complementary circuit such as power supply, clock, therefore though multiple, shown in Figure 2 structure is arranged is a kind of scheme of optimization relatively to implementation of the present invention.

Claims (4)

1. remote RF hub based on digital intermediate frequency transmission comprises respectively the physical interface that is connected with baseband pool with radio frequency remote equipment,
The described physical interface that is connected with radio frequency remote equipment is in order to carrying up-downgoing digital intermediate frequency data and Monitoring and Controlling data;
The described physical interface that is connected with baseband pool is in order to carrying base band data and control detection information;
It is characterized in that, also comprise:
The Digital IF Processing circuit arrives the conversion of base band data and the conversion that the downgoing baseband data arrive digital medium-frequency signal in order to finish the upstream digital intermediate-freuqncy signal.
2. the remote RF hub based on the digital intermediate frequency transmission as claimed in claim 1 is characterized in that, also comprises:
The cross over circuit of data, up-downgoing data close the road shunt circuit;
The cross over circuit of described data is finished the interconnection of multichannel data;
The up-downgoing data close the road shunt circuit, finish the shunt function of closing road and downlink data of upstream data;
The cross over circuit of described data, an end is connected by physical interface with the base band battery, and the other end connects digital intermediate-frequency circuit;
Described up-downgoing data close the road shunt circuit, an end is connected by physical interface with radio frequency remote equipment, the other end connects digital processing circuitry of intermediate frequency.
3. the remote RF hub based on the digital intermediate frequency transmission as claimed in claim 2 is characterized in that, also comprises:
The cross over circuit of described data and up-downgoing data close the road shunt circuit, can be positioned at before the Digital IF Processing circuit or afterwards.
4. as claim 2 or 3 described remote RF hubs, it is characterized in that, also comprise based on the digital intermediate frequency transmission:
The cross over circuit of described data and up-downgoing data close the order scalable of road shunt circuit in circuit.
CNA2007100029599A 2007-01-30 2007-01-30 A remote RF hub based on digital middle frequency transmission Pending CN101237629A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007100029599A CN101237629A (en) 2007-01-30 2007-01-30 A remote RF hub based on digital middle frequency transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007100029599A CN101237629A (en) 2007-01-30 2007-01-30 A remote RF hub based on digital middle frequency transmission

Publications (1)

Publication Number Publication Date
CN101237629A true CN101237629A (en) 2008-08-06

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102752250A (en) * 2011-04-19 2012-10-24 鼎桥通信技术有限公司 Intermediate frequency processing method and device for uplink and downlink, and radio remote unit (RRU)
CN101835185B (en) * 2009-03-11 2013-03-20 中兴通讯股份有限公司 Method for carrying out control or equipment information inquiry on base station equipment
CN107211480A (en) * 2015-02-03 2017-09-26 华为技术有限公司 Distributed base station and method for transmitting signals
CN111740752A (en) * 2019-03-25 2020-10-02 大唐移动通信设备有限公司 Method and device for processing digital intermediate frequency signal

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101835185B (en) * 2009-03-11 2013-03-20 中兴通讯股份有限公司 Method for carrying out control or equipment information inquiry on base station equipment
CN102752250A (en) * 2011-04-19 2012-10-24 鼎桥通信技术有限公司 Intermediate frequency processing method and device for uplink and downlink, and radio remote unit (RRU)
CN102752250B (en) * 2011-04-19 2014-12-10 鼎桥通信技术有限公司 Intermediate frequency processing method and device for uplink and downlink, and radio remote unit (RRU)
CN107211480A (en) * 2015-02-03 2017-09-26 华为技术有限公司 Distributed base station and method for transmitting signals
CN107211480B (en) * 2015-02-03 2020-06-02 华为技术有限公司 Distributed base station and signal transmission method
CN111740752A (en) * 2019-03-25 2020-10-02 大唐移动通信设备有限公司 Method and device for processing digital intermediate frequency signal
CN111740752B (en) * 2019-03-25 2021-04-16 大唐移动通信设备有限公司 Method and device for processing digital intermediate frequency signal

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Application publication date: 20080806