CN110225528A - One master-slave type remote radio unit (RRU) and its method for realizing indoor depth covering - Google Patents
One master-slave type remote radio unit (RRU) and its method for realizing indoor depth covering Download PDFInfo
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- CN110225528A CN110225528A CN201910397676.1A CN201910397676A CN110225528A CN 110225528 A CN110225528 A CN 110225528A CN 201910397676 A CN201910397676 A CN 201910397676A CN 110225528 A CN110225528 A CN 110225528A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2609—Arrangements for range control, e.g. by using remote antennas
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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
- H04W16/20—Network planning tools for indoor coverage or short range network deployment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Abstract
The embodiment of the invention discloses a master-slave type remote radio unit (RRU) and its methods for realizing indoor depth covering, it is connected between master and slave type remote radio unit (RRU) by cable, and expanding element is connected to by cable or optoelectronic composite cable, expanding element is connected to baseband processing unit by optical cable；Master and slave type remote radio unit (RRU) includes: radio frequency capacity type mother's unit, for receiving and dispatching the digital baseband signal of baseband processing unit；Intermediate-freuqncy signal for receiving the intermediate-freuqncy signal of radio frequency capacity type mother's unit, and is converted to radiofrequency signal by radio frequency cover type subelement, by the built-in antenna for being transmitted to radio frequency capacity type mother's unit after filter amplifier；More than two external antenna interfaces are set inside radio frequency capacity type mother unit, and external antenna interface is used to pass through the external more than two radio frequency cover type subelements of cable.By the master and slave type remote radio unit (RRU), line loss can be reduced, and meets covering and requires.In addition, putting maintenance into practice is convenient, dilatation is simple, and overall cost is low.
Description
Technical field
The present invention relates to mobile communication technology field more particularly to a master-slave type remote radio unit (RRU) and its realize indoor
The method of depth covering.
Background technique
The covering of indoor depth always using traditional distributed antenna system (Distributed Antenna Systems,
DAS it) covers, in the 2G/3G epoch, DAS can sufficiently meet the needs of voice connects business with low rate, but in the 4G epoch, no
The increase of limit flow set meal causes customer flow madness to increase, and brings storage DAS network capacity extension pressure.Traditional DAS is to cover
For target, the enabling of promotion and rapid growth, the arrival in 5G epoch and indoor high band due to capacity is limited traditional
The development of DAS.Therefore, the 4G epoch slowly digitize distributed base station (Digital Indoor using new indoor
System, DIS) it is covered, divide framework networking by three-level room, can be realized antenna head end activeization, transmits cable/optical fiber
Change, features, these features such as O&M visualization and multi-business diversification fully meet the capacity requirement of 4G, while the internal home network frame
Structure has the evolution ability for being rapidly introduced into the new radio communication of 5G (New Radio, NR).
At this stage DIS use three floor room divide framework be divided into baseband processing unit (Building Baseband Unit,
BBU entire base station system, expanding element (Expansion Unit, EU) RF remote common public radio interface) are controlled
(Common Public Radio Interface, CPRI) data converge unit, realize BBU and Remote Radio Unit (Radio
Unit, RU) between communication, RU realize radiofrequency signal processing function.RU is generally the transmission power unit of 50mw and 100mw,
Similar to the access points (Access of Wireless LAN (Wireless Local Area Networks, WLAN)
Point, AP).The demand that target scene capacity can be fully met using DIS framework, for separating more and covering the field of demand
Scape, by the way of independently putting dress, although the transmission power of RU power ratio traditional antenna is 1~3 times high, in the covering of spacious scene
Effect can be better than traditional antenna.
But indoors seldom there is large stretch of unobstructed depletion region, most transmission power in scene, most of building
It will be consumed on useless wall penetration loss, therefore be covered in mostly partition scene using relatively powerful RU unit,
Coverage effect can't be significantly improved, improves coverage rate, the unit laid due to RU unit if increasing RU unit and laying quantity
High expensive, in the case where mostly partition scene is independently laid, Construction Party is difficult to receive.In order to reach coverage rate index, guarantee
The continuous spreadability of long term evolution voice bearer (Voice over Long-Term Evolution, VoLTE) indoors, RU are mono-
Member can also use external more concubine divided antennas, i.e., small distribution mode.Although such mode can make up the field of more exclusion regions
Scape, but the RU unit of in general 100mw can at least external 4 antennas, then at least loss of 3.3dB, therefore external connector
The loss of part and feeder line is natively little RU transmission power, and consumption at least 50% is on transmission channel, while small distribution side
The problem of installation that formula encounters and maintainability, and return on traditional old road DAS, such mode is that DIS compromises to traditional DAS,
The even more retroversion of indoor distributed system evolution.
Summary of the invention
It is existing to solve the present invention provides a master-slave type remote radio unit (RRU) and its method for realizing indoor depth covering
Have in technology, by the external more concubine divided antennas of RU, i.e., small distribution mode realizes indoor depth covering, refers to reach coverage rate
Mark guarantees the continuous spreadability of long term evolution voice bearer indoors, and the loss of external device and feeder line consumption is caused to transmit
On access, and install and this problem difficult in maintenance.
The present invention provides a master-slave type remote radio unit (RRU), is connected between the master and slave type remote radio unit (RRU) by cable
It connects, the master and slave type remote radio unit (RRU) is connected to expanding element by cable or optoelectronic composite cable, and the expanding element is logical
It crosses optical cable and is connected to baseband processing unit；
The master and slave type remote radio unit (RRU) includes: radio frequency capacity type mother unit and radio frequency cover type subelement；
Radio frequency capacity type mother's unit, for receiving and dispatching the digital baseband signal of baseband processing unit；
The radio frequency cover type subelement, for receiving the intermediate-freuqncy signal of radio frequency capacity type mother's unit, and by the intermediate frequency
Signal is converted to radiofrequency signal, by the built-in antenna for being transmitted to radio frequency capacity type mother's unit after filter amplifier；
More than two external antenna interfaces are set inside the radio frequency capacity type mother unit, and the external antenna interface is used
In pass through the external more than two radio frequency cover type subelements of cable.
Further, in one implementation, radio frequency capacity type mother's unit includes:
Radio frequency capacity type mother's unit is for being transmitted to baseband processing unit for digital baseband signal when receiving；
Radio frequency capacity type mother's unit is for being converted to intermediate-freuqncy signal and radio frequency for the digital baseband signal when sending
Signal, and the intermediate-freuqncy signal is sent to radio frequency cover type subelement, by the radiofrequency signal by being passed after filter amplifier
Transport to the built-in antenna of radio frequency capacity type mother's unit.
Further, in one implementation, radio frequency capacity type mother's unit includes:
Radio frequency capacity type mother's unit includes:
Module for power supply unit for providing plate interior power by the power supply system based on local area network, and is covered to the radio frequency
Cap-type subelement provides power supply；
Module clock unit, for for the radio frequency capacity type mother unit and penetrating from Ethernet interface extraction system clock
Frequency cover type subelement provides work clock and synchronised clock；
Module monitors administrative unit, for monitoring and managing the radio frequency capacity type mother unit and radio frequency cover type subelement
The operation of modules veneer；
Module interface unit is converted into analog baseband signal for handling digital baseband signal, and by digital baseband signal；
Module converter unit is converted to analog intermediate frequency signal for realizing by analog baseband signal；
Module digital processing element is converted to digital intermediate frequency signal for realizing analog intermediate frequency signal.
Further, in one implementation, the radio frequency cover type subelement includes:
Converter unit, for intermediate-freuqncy signal to be converted to radiofrequency signal；
Digital processing element, for digital intermediate frequency signal to be converted to analog intermediate frequency signal.
Further, in one implementation, radio frequency capacity type mother's unit includes: penetrating containing Transmit Receive Unit
Frequency capacity type mother unit or radio frequency capacity type mother's unit without Transmit Receive Unit, the Transmit Receive Unit include filtering
Amplifier and built-in antenna.
Further, in one implementation, the cable is Cat6A cable.
Further, in one implementation, if the radio frequency capacity type mother unit and radio frequency cover type subelement
Power and power consumption continue to increase, and are connected between expanding element and radio frequency capacity type mother's unit using optoelectronic composite cable.
Further, the present invention realizes indoor depth covering using the master and slave type remote radio unit (RRU), comprising:
Radio frequency capacity type mother's unit receives the digital baseband signal of baseband processing unit, and the digital baseband is believed
Number be converted to intermediate-freuqncy signal and radiofrequency signal；
Intermediate-freuqncy signal is sent to radio frequency cover type subelement by the radio frequency capacity type mother unit, and by the radiofrequency signal
By the built-in antenna for being transmitted to radio frequency capacity type mother's unit after filter amplifier；
Intermediate-freuqncy signal is converted to radiofrequency signal by the radio frequency cover type subelement, and the radiofrequency signal is passed through filtering
The built-in antenna of radio frequency capacity type mother's unit is transmitted to after amplifier.
Further, in one implementation, indoor depth covering is realized using the master and slave type remote radio unit (RRU),
Include:
Radio frequency capacity type mother's unit when containing Transmit-Receive Unit, the radio frequency capacity type mother unit are single to radio frequency cover type
Member is powered and monitoring management；
When radio frequency capacity type mother's unit is free of Transmit-Receive Unit, radio frequency capacity type mother's unit is radio frequency cover type
Subelement；
The Transmit Receive Unit includes: the built-in antenna of filter amplifier and radio frequency capacity type mother's unit.
Further, in one implementation, indoor depth covering is realized using the master and slave type remote radio unit (RRU)
Meet default power reguirements and scheduled rate requirement.
From the above technical scheme, the embodiment of the present invention provides a master-slave type remote radio unit (RRU) and its realizes indoor
The method of depth covering.It is connected between the master and slave type remote radio unit (RRU) by cable, the master and slave type remote radio unit (RRU)
It is connected to expanding element by cable or optoelectronic composite cable, the expanding element is connected to baseband processing unit by optical cable；
The master and slave type remote radio unit (RRU) includes: radio frequency capacity type mother unit and radio frequency cover type subelement；The radio frequency capacity type
Female unit, for receiving and dispatching the digital baseband signal of baseband processing unit；The radio frequency cover type subelement holds for receiving radio frequency
The intermediate-freuqncy signal of amount type mother's unit, and the intermediate-freuqncy signal is converted into radiofrequency signal, by being transmitted to institute after filter amplifier
State the built-in antenna of radio frequency capacity type mother's unit；More than two external antennas are arranged inside the radio frequency capacity type mother unit to connect
Mouthful, the external antenna interface is used to pass through the external more than two radio frequency cover type subelements of cable.
More than two external antenna interfaces (antenna, ANT) are set inside radio frequency capacity type mother unit, are covered with radio frequency
Cap-type subelement is connected, and transmits general public nothing by cable or optoelectronic composite cable between BBU and radio frequency capacity type mother's unit
Line interface (common public radio interface, CPRI) data.Radio frequency capacity type mother unit and radio frequency cover type
Using intermediate-freuqncy signal transmission, it can be achieved that radio frequency cover type subelement low transmitting power, low-power consumption, increase transmission range between unit
To 200m without expansion equipment, support 256 quadrature amplitude modulations (Quadrature Amplitude Modulation,
QAM) and 4 × 4 multiple-input and multiple-outputs (Multiple-Input Multiple-Output, MIMO) meet high capacity demand.This
Outside, radio frequency capacity type mother unit not only can be used as female unit of capacity type, can also provide simultaneously increasing radio frequency unit
Capacity services and wireless access function.Therefore, master and slave type remote radio unit (RRU) of the present invention and its realization depth cover
Method, can reduce line loss, sufficiently meets the covering of radio frequency cover type subelement and requires.In addition, the master and slave type distal end is penetrated
The implementation of frequency unit, easy to maintain；Dilatation is unrestricted, simple；Overall cost is low.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the configuration diagram of original DIS；
Fig. 2 is a kind of rPU and rSU connection schematic diagram that part of the embodiment of the present invention provides；
Fig. 3 is the more partition scene covering schematic diagrames of one kind that part of the embodiment of the present invention provides；
Fig. 4 is a kind of CPRI frame length schematic diagram that part of the embodiment of the present invention provides；
Fig. 5 is a kind of rPU unit front schematic view that part of the embodiment of the present invention provides；
Fig. 6 is a kind of rPU side schematic view that part of the embodiment of the present invention provides；
Fig. 7 is a kind of rPU hardware capability composition schematic diagram containing radio frequency unit that part of the embodiment of the present invention provides；
Fig. 8 is a kind of rPU hardware capability composition schematic diagram without radio frequency unit that part of the embodiment of the present invention provides；
Fig. 9 is a kind of rSU front schematic view that part of the embodiment of the present invention provides；
Figure 10 is a kind of rSU side schematic view that part of the embodiment of the present invention provides；
Figure 11 is a kind of rSU hardware capability composition schematic diagram that part of the embodiment of the present invention provides.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Figure 1, original DIS framework divides framework to be specifically divided into BBU, EU and RU using three floor room.In the prior art,
By the external more concubine divided antennas of RU unit, i.e., small distribution mode solves indoor depth covering and protects to reach coverage rate index
The continuous spreadability of long term evolution voice bearer indoors is demonstrate,proved, causes the loss of external device and feeder line consumption in transmission channel
On, and install and it is difficult in maintenance.
The embodiment of the present invention provides a master-slave type remote radio unit (RRU), passes through between the master and slave type remote radio unit (RRU)
Cable connection, the master and slave type remote radio unit (RRU) are connected to expanding element, the extension by cable or optoelectronic composite cable
Unit is connected to baseband processing unit by optical cable.
The master and slave type remote radio unit (RRU) meets the default covering demand and preset capacity demand of target area.This implementation
In example, the default covering demand is the examination threshold requirement for meeting indoor 95% region and being greater than setting, such as: in long term evolution
Under (Long Term Evolution, LTE) is required, Reference Signal Received Power (Reference Signal Receiving
Power, RSRP) it is greater than or equal to -105dBm；The preset capacity demand is to meet room area Mean Speed to be greater than examination door
Limit requires, such as: under LTE requirement, downloading Mean Speed is greater than or equal to 70Mbps, and uploading rate is greater than or equal to
100Mbps。
The master and slave type remote radio unit (RRU) includes: radio frequency capacity type mother unit and radio frequency cover type subelement.Such as Fig. 2 institute
Show, the present invention does not adjust to two level frameworks before original DIS framework, in the third level of original DIS framework, i.e. RU
On expand, RU is replaced with into radio frequency capacity type mother unit (radio Parent Unit, rPU), and in the radio frequency capacity type
Under female unit and meet several radio frequency cover type subelements (radio Sub Unit, rSU).
Radio frequency capacity type mother's unit, for receiving and dispatching the digital baseband signal of baseband processing unit；The radio frequency covering
Type subelement is converted to radiofrequency signal for receiving the intermediate-freuqncy signal of radio frequency capacity type mother's unit, and by the intermediate-freuqncy signal, leads to
It crosses after filter amplifier and is transmitted to the built-in antenna of radio frequency capacity type mother's unit.
More than two external antenna interfaces are set inside the radio frequency capacity type mother unit, and the external antenna interface is used
In pass through the external more than two radio frequency cover type subelements of cable.
Radio frequency capacity type mother's unit includes: radio frequency capacity type mother's unit for when receiving, digital baseband to be believed
Number it is transmitted to baseband processing unit；Radio frequency capacity type mother's unit is for when sending, the digital baseband signal to be converted to
Intermediate-freuqncy signal and radiofrequency signal, and the intermediate-freuqncy signal is sent to radio frequency cover type subelement, the radiofrequency signal is passed through
The built-in antenna of radio frequency capacity type mother's unit is transmitted to after filter amplifier.
Radio frequency capacity type mother's unit includes: module for power supply unit, for being mentioned by the power supply system based on local area network
Power supply is provided for plate interior power, and to the radio frequency cover type subelement；Module clock unit, for being extracted from Ethernet interface
System clock provides work clock and synchronised clock for the radio frequency capacity type mother unit and radio frequency cover type subelement；Module
Monitoring management unit, for monitoring and managing the radio frequency capacity type mother unit and radio frequency cover type subelement modules veneer
Operation；Module interface unit is converted into analog baseband signal for handling digital baseband signal, and by digital baseband signal；Mould
Block converter unit is converted to analog intermediate frequency signal for realizing by analog baseband signal；Module digital processing element, for realizing
Analog intermediate frequency signal is converted to digital intermediate frequency signal.The radio frequency cover type subelement includes: converter unit, for believing intermediate frequency
Number be converted to radiofrequency signal；Digital processing element, for digital intermediate frequency signal to be converted to analog intermediate frequency signal.
Radio frequency capacity type mother's unit includes: radio frequency capacity type mother unit containing Transmit Receive Unit or without radio frequency
Radio frequency capacity type mother's unit of Transmit-Receive Unit, the Transmit Receive Unit include filter amplifier and radio frequency capacity type mother's unit
Built-in antenna.
The cable is Cat6A cable.If the power of the radio frequency capacity type mother unit and radio frequency cover type subelement and
Power consumption continues to increase, and is connected between expanding element and radio frequency capacity type mother's unit using optoelectronic composite cable.
In the present embodiment, the more than two external antenna interfaces of radio frequency capacity type mother unit inside setting (antenna,
ANT), it is connected with radio frequency cover type subelement, is passed between BBU and radio frequency capacity type mother's unit by cable or optoelectronic composite cable
Defeated common public radio interface (common public radio interface, CPRI) data.
Using intermediate-freuqncy signal transmission, it can be achieved that radio frequency covers between radio frequency capacity type mother unit and radio frequency cover type subelement
Type subelement low transmitting power, low-power consumption increase transmission range to 200m without expansion equipment, support 256 orthogonal amplitude tune
Make (Quadrature Amplitude Modulation, QAM) and 4 × 4 multiple-input and multiple-output (Multiple-Input
Multiple-Output, MIMO) meet high capacity demand.In addition, radio frequency capacity type mother's unit not only can be used as capacity type
Female unit, capacity services and wireless access function can also be provided simultaneously increasing radio frequency unit.
Therefore, following advantage may be implemented in master and slave type remote radio unit (RRU) of the present invention: reducing line loss, fills
Divide and meets the covering requirement of radio frequency cover type subelement；Implement, easy to maintain；Dilatation is unrestricted, simple；Reduce overall cost.
In addition, a kind of side for realizing indoor depth covering by master and slave type remote radio unit (RRU) is also disclosed in the embodiment of the present invention
Method, which comprises radio frequency capacity type mother's unit receives the digital baseband signal of baseband processing unit, and by the number
Word baseband signal is converted to intermediate-freuqncy signal and radiofrequency signal；Intermediate-freuqncy signal is sent to radio frequency and covered by the radio frequency capacity type mother unit
Cap-type subelement, and by the radiofrequency signal by being transmitted to the built-in antenna of radio frequency capacity type mother's unit after filter amplifier；
Intermediate-freuqncy signal is converted to radiofrequency signal by the radio frequency cover type subelement, and the radiofrequency signal is passed through after filter amplifier
It is transmitted to the built-in antenna of radio frequency capacity type mother's unit.
Radio frequency capacity type mother's unit when containing Transmit-Receive Unit, the radio frequency capacity type mother unit are single to radio frequency cover type
Member is powered and monitoring management；When radio frequency capacity type mother's unit is free of Transmit-Receive Unit, radio frequency capacity type mother's unit
As radio frequency cover type subelement；
The Transmit Receive Unit includes: the built-in antenna of filter amplifier and radio frequency capacity type mother's unit.
In master and slave type remote radio unit (RRU) of the present invention, rPU performance is similar with RU, but it is additional increase it is external
The function of rSU realizes the power supply and monitoring management to rSU when rPU is free of Transmit Receive Unit；When rPU function containing radio-frequency receiving-transmitting
When energy, itself can realize coverage goal scene as a rSU.
The method meets default power reguirements and scheduled rate requirement.Due to the confession between RU in the prior art and EU
Electric mode is using power supply system (Power over Ethernet, the POE) power supply based on local area network, and the present invention replaces RU
For rPU, and under rPU and connect several rSU, this method that indoor depth covering is realized by master and slave type remote radio unit (RRU)
It can satisfy default power reguirements and scheduled rate requirement.
Specifically, in the present embodiment, the default power reguirements are as follows: rPU and rSU is supplied by the module for power supply unit of rPU
Electricity, using IEE 802.3bt (PoE++) standard, rPU and rSU are all made of PoE-48V DC direct current supply, module for power supply unit by
The EU of the first line of a couplet is responsible for providing power supply；The scheduled rate requirement are as follows: rPU and rSU scheduled rate presses the setting of rPU peak rate.
Therefore, creative use rPU of the present invention adds rSU, is connected using cable mode, not only solves capacity type scene, and
And transmission power is made to meet more partitions and cover type regional demand in the case where reducing cost.It realizes on traditional DAS " more days
The characteristic of line, small-power " meets the continuity of covering and the evolution of future DIS.
As shown in figure 3, in the present embodiment, arranging an EU by computer room rack indoors or vertical shaft side wall, simultaneously
RPU is arranged compared with big room in user density, and arranges a rSU in each room separated, to meet more partition fields
The covering requirement of scape.
In the present embodiment, measuring and calculating meets the farthest network cable transmission distance of PD first；Then whether measuring and calculating cable meets future
Evolution demand；The ability for finally carrying LTE and 5G indoors according to Cat6A obtains the factor that rSU quantity is connect under limitation rPU.Tool
Body, it will give illustrate below:
802.3 agreements that POE standard source is organized in IEE, newest protocol definition are 802.3bt, which will power
Equipment (Power Sourcing Equipment, PSE) maximum power promotes three times, extends to 90W from 30W, and electricity consumption is set
The power level of standby (Powered Device, PD) is increased to 71.3W, and the continuous enhancing of power supply capacity is met more high-power
The use of equipment, while defining the channel for supporting 2.5Gbps, 5Gbps and 10Gbps POE work.
The definition provided from newest standards agreement, which can be calculated, meets the farthest network cable transmission distance of PD, as shown in table 1
Theoretical formula method:
1 power supply distance measure and calculate table of table
Known PSE peak power output is 90W, and the maximum value of PSE voltage is 57V, according to electric current (I)=power (P)/electricity
It presses (U), it is 1.6A that electric current, which is calculated, and the electric current of every a pair of line is 1.6/2=0.8A, and Cat6A cable resistance (R) is 0.07
Ω/m, then the power consumption of two pairs of 200 meters of Cat6A cables loss is R × I^2 × 2 × 200m, obtains 17.92W, PD by electrical power=
The power consumption of-two pairs of 200 meters of Cat6A cables of PSE peak power output loss, therefore, PD are 90-17.92=by electrical power
72.08W。
The peak power output of 802.3bt protocol definition PD is 71W, calculates acquired results, 72.08W > according to upper meter
71W, i.e. PD are greater than PD peak power output by electrical power, and therefore, the transmission range in 200 meters fully meets the need of electrical equipment
It asks.
Whether the following 5G evolution demand is met to cable below, does following measuring and calculating:
BBU to rPU transmits digital baseband signal using CPRI, is based on following CPRI interface bandwidth formula:
Interface bandwidth Peak bit rate=base station antenna element number × sample frequency × bit width+expense, wherein described
Sample frequency is proportional to system bandwidth, and bit width refers to the bit width of each sampling.
According to the CPRI interface bandwidth formula, setting as shown in Table 2 is obtained:
2 transmission rate measure and calculate table of table
Specifically, the following are to the parameter interpretation in table 2:
Using LTE technology:
(1) baseband bandwidth: 20M is herein 3GPP TS36.521 agreement regulation.
(2) IFFT point number:
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) requires to realize
It is orthogonal between each subcarrier, it can be real using Fast Fourier Transform (FFT) (Fast Fourier Transformation, FFT)
Existing orthogonal transformation uses inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT) in transmitting terminal
Modulation, frequency domain become time domain, are demodulated in receiving end using FFT, time domain frequency conversion domain.
The quantity of the data point in wave-shape amplitude table when the sampled point points of IFFT are IFFT operations, the rank with subcarrier
Number be it is relevant, provided according to agreement, for convenient for computer disposal, it is desirable that IFFT sampled point points be 2 power, due to 20M
Corresponding 1200 subcarriers of bandwidth, be exactly 2048 points from 1,200 2 nearest n times sides, and so on, the sampling of 15M bandwidth
Point is 1024 points, and the sampled point of 10M bandwidth is 1024 points, and the sampled point of 5M bandwidth is 512 points.
(3) subcarrier spacing: 15Hz is herein 36.211 agreement of 3GPP TS regulation.
(4) baseband I/Q samples bandwidth: 2048 × 15KHz × 2
Because sampling is a time domain concept, all subcarriers are parallel in the time domain, therefore are considered from time domain, one
The time interval of subcarrier is 1/15KHz, then the sampling interval is exactly 1/ (15KHz × 2048), and I/Q is quadrature in phase concept, institute
To consider that I/Q branch, hits also need to multiply 2, so the sampling interval is 1/ (15KHz × 048 × 2), then it is counter shift frequency domain onto, just
It is 2048 × 15KHz × 2.
(5) bit wide: 15bit is sampled
According to the demand of eating dishes without rice or wine and uplink and downlink characteristic, common public radio interface (Common Public Radio
Interface, CPRI) different bit widths can be used.Bit width on down direction is 8 to 20 bits, in order to obtain
Higher sampling rate is taken, the bit width on up direction is 4 to 20 bits.It, can also be in addition, when I/Q sampled value is smaller
Spare bits are filled by the way of signal extension or using reserved bit filling, to obtain biggish bit width
Degree.When using different bit widths for uplink and downlink, this processing method is more useful, but when being hinted obliquely on CPRI, leads to
Normal uplink and downlink can all use identical sampling width.
Briefly, i/q signal follows following rule to hinting obliquely at for CPRI interface:
Uplink I/Q sampling width: 4~20bits, accepted value 12,15 and 16.
Downlink I/Q sampling width: 8~20bits, accepted value 12,15 and 16.
(6) every road sampled data stream: 2048 × 15KHz × 2 × 15bit.
From the point of view of frequency domain, the baseband sampling bandwidth of calculating is 2048 × 15KHz × 2, and the width of sampling is 15bit, from adopting
It is a spreading procedure from the point of view of the concept of sample bit wide, therefore, every road sampled data stream=2048 × 15KHz × 2 × 15bit
(7) CPRI adds control word W0: increasing a control word.
Multiple baseband Is/Q data stream, the corresponding carrier wave of each I/Q data flow and an antenna are transmitted on CPRI link.
The basic frame length Tc=1/fc=1/3.84MHz=260.41667ns of CPRI.One basic frame includes 16
word.Wherein first word is control word, remaining 15 word is user face I/Q data.8 bits in each word,
As shown in Figure 4；So needing multiplied by 16/15, i.e., are as follows: every road sampled data stream × 16/15.
(8) CPRI adds the expense of 8B/10B line coding:
The code word of 8 bits is mapped on the symbol of 10 bits by 8B/10B coded representation, and 64B/66B is similarly.
The characteristic of 8B/10B coding first is that guarantee DC balance, using 8B/10B coding mode, may make transmission " 0 ",
" 1 " quantity keeps almost the same, and continuous " 1 " or " 0 " is no more than 5, i.e., must be inserted into one after every 5 continuous " 1 " or " 0 "
Position " 0 " or " 1 ", to guarantee that signal DC is balanced, that is to say, that DC imbalance will not occur in link time-out.Pass through 8B/10B
Coding, it is ensured that the serial data of transmission can correctly be restored in receiving end.
So multiplied by 10/8, i.e., are as follows: CPRI addition control W0 × 10/8
(9) 2T2R MIMO CPRI bandwidth: No. 2 antennas
4T/4R MIMO CPRI bandwidth: No. 4 antennas
Using 5G technology:
In the present embodiment, and identical parameter under LTE technical situation is used to repeat no more:
(10) baseband bandwidth: 100M (3GPP TS38.101 agreement regulation)
(11) IFFT point number:
RB number required on 100M bandwidth 30KHz is 273 (3GPP TS38.104), and sub-carrier number is 273 × 12
=3276, it is 4096 from 3276 immediate 2 n times sides, so using IFFT4096.
(12) subcarrier spacing:
According to the description of 3GPP TS 382.11, the subcarrier bandwidth that NR is supported can choose 15/30/60/120/240/
480KHz。
Since Cat6A cable can carry 500MHz bandwidth, in 100 meters, maximum rate 10Gpbs；In 200 meters, most
Big rate 6Gbps.Then calculated according to table 2, the standard amount of bandwidth that Cat6A cable carries under different distance is obtained, such as 3 institute of table
Show:
The ability of single cable carrying LTE and 5G in table Room 3
From table 1, table 2 and table 3 it is found that making the not instead of rate for connecing rSU limited amount under rPU, power.Specifically,
Because existing 802.3bt standard is 71W, rPU and rSU as carrier frequency number increases to PD export-restriction, power consumption increases, therefore limited
RSU quantity is hung under rPU.
Therefore, in master and slave type remote radio unit (RRU) of the present invention, rPU performance is similar with RU, but additional increases
The function of external rSU realizes the power supply and monitoring management to rSU when rPU is free of Transmit Receive Unit；When rPU contains radio frequency
When transmission-receiving function, itself can realize coverage goal scene as a rSU.
As it can be seen in figures 5 and 6, and combine table 4, it is known that interface index 1~4 be defined as ANTx, it is external by Cat6A cable
RSU, ANTx can be increased or decreased；Interface index 5 is defined as CPRI_1, which connect with EU, transmits between EU and rPU
CPRI data support PoE power supply；Interface index 6 is defined as CPRI_2, is spare interface；Interface index 7 is defined as PWR, this connects
Mouth connects with adapter, provides 12V DC power supply, when powering using POE, no longer needs to offer power input；Interface index a definition
It is run indicator for RUN；Interface index b is defined as ALM, is alarm indicator.
In addition, in Fig. 5 and Fig. 6 rPU specification size, be reference value provided in this embodiment.Specifically, such as Fig. 5 institute
Show, the length and width of rPU can be set to 220mm, as shown in fig. 6, the height of rPU can be set to 50mm.
4 rPU interface function of table illustrates table
As shown in Figure 7 and Figure 8, in conjunction with table 5, it is known that rPU hardware capability composition includes: module for power supply unit, for passing through
PoE provides plate interior power；Module clock, for providing work clock for rPU and rSU from Ethernet interface extraction system clock
And synchronised clock；Module monitors management, for monitoring and management single board operation；Module interface unit, for providing Base-Band Processing
Signal processing and digital-to-analogue conversion, by taking transmitting terminal as an example: using zero intermediate frequency technology, be modulated to transmitting terminal, through filter and amplification, pass through
Built-in antenna transmitting；Module converter unit turns intermediate-freuqncy signal for realizing base-band analog signal；Module digital processing element is used
Turn digital signal in realization analog intermediate frequency.
5 rPU functions of modules of table illustrates table
As shown in Fig. 9, Figure 10 and Figure 11, in conjunction with table 6 and table 7, it is known that rSU unit is substantially exactly one from traditional RU
The radio-frequency module zoomed out being stripped out changes into radiofrequency signal by the digital medium-frequency signal that rPU is issued, and realizes the system such as LTE, 5G
The wireless coverage of formula, while receiving upstream radio-frequency signal and changing into digital medium-frequency signal, rPU is reached, realizes the signal of specific region
Access and covering, as shown in Figure 10, interface index 1 is defined as RUN, be run indicator；Interface index 2 is defined as ALM, is
Alarm indicator；Interface index 3 is defined as ETH, for the interface connecting with rPU, transmits the intermediate frequency data between rPU, supports
PoE power supply.As shown in figure 11, middle converter unit module turns radiofrequency signal function for realizing intermediate-freuqncy signal；Digital processing element
Module turns analog signal for realizing digital intermediate frequency signal.
In addition, in Fig. 9 and Figure 10 rSU specification sizes values, be reference value provided in this embodiment.Specifically, such as Fig. 9
Shown, the outer diameter of rSU can be set to 60mm, and as shown in Figure 10, the height of rSU can be set to 25mm.
6 rSU interface function of table illustrates table
7 rSU functions of modules of table illustrates table
| Module title | Function declaration |
| Converter unit | Intermediate-freuqncy signal turns radiofrequency signal |
| Digital processing element | Digital intermediate frequency signal turns analog signal |
Known conditions, power consumption of the different distal powers under different frequency range are as shown in table 8:
Power consumption of the different distal powers of table 8 under different frequency range
| Distal end power consumption | 100mw | 50mw | 25mw |
| Single-frequency (IBW:20M) (1.8G/2.1G) | 18w | 15w | 13w |
| Double frequency (IBW:40M) (1.8G&2.1G) | 22w | 18w | 15w |
| Three frequencies (IBW:50M) (1.8G&2.1&800M) | 37w | 30w | 24w |
It is as shown in table 9 using rPU+rSU framework single-frequency different capacity combination in the present embodiment:
Table 9 uses rPU+rSU framework single-frequency different capacity combination
It as shown in Table 9, can be with external more rSU if rPU is without Transmit Receive Unit.Due to the far-end unit function of 5G
Rate and power consumption can all increase, and about for the power of raising 20%, POE PD in the case where constant, the quantity of external rSU will be further
It reduces, then can use optoelectronic composite cable between EU and rPU, in this case, PSE power supply capacity reaches 130W/1.5m2,
Fully meet the rPU+rSU framework under 5G.
When using master and slave type remote radio unit (RRU), the different scenes that indoor depth can be covered, according to user density
Rationally lay, specific:
1) for pure cover type scene, it is proposed that combined using 50mw rPU without Transmit Receive Unit mould group+25mw rSU
To cover；
2) for having capacity type+cover type scene concurrently, it is proposed that using 100/50mw rPU band Transmit Receive Unit mould group+
25/50mwSU combines to cover；
3) covering scene for being oriented to capacity, it is proposed that using 100mw rPU band Transmit Receive Unit mould group+25mw
RSU combines to cover.
100mw rPU is placed on that user density is higher, the open, region that separates less on laying mode, 50/25mwrSU
Be placed on the region that user density is lower, separate more, for more exclusion regions use 25mw rSU, as shown in Figure 3 in room
It inside lays, realizes " multiple antennas, small-power " uniform fold advantage of tradition distribution.
The present invention provides a master-slave type remote radio unit (RRU) and its method for realizing indoor depth covering, specific implementations
There are many method and approach of the technical solution, the above is only a preferred embodiment of the present invention, it is noted that for this skill
For the those of ordinary skill in art field, various improvements and modifications may be made without departing from the principle of the present invention,
These modifications and embellishments should also be considered as the scope of protection of the present invention.Each component part being not known in the present embodiment can be used existing
Technology is realized.
In the specific implementation, the present invention also provides a kind of computer storage mediums, wherein the computer storage medium can store
There is program, which may include master-slave type remote radio unit (RRU) provided by the invention when executing and its realize that indoor depth is covered
Step some or all of in each embodiment of the method for lid.The storage medium can be magnetic disk, CD, read-only store-memory
Body (read-only memory, ROM) or random access memory (random access memory, RAM) etc..
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software
The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present invention substantially or
Say that the part that contributes to existing technology can be embodied in the form of software products, which can deposit
Storage is in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that computer equipment (can be with
It is personal computer, server or the network equipment etc.) execute certain part institutes of each embodiment of the present invention or embodiment
The method stated.
Same and similar part may refer to each other between each embodiment in this specification.Invention described above is real
The mode of applying is not intended to limit the scope of the present invention..
Claims (10)
1. a master-slave type remote radio unit (RRU), which is characterized in that connected between the master and slave type remote radio unit (RRU) by cable
It connects, the master and slave type remote radio unit (RRU) is connected to expanding element by cable or optoelectronic composite cable, and the expanding element is logical
It crosses optical cable and is connected to baseband processing unit；
The master and slave type remote radio unit (RRU) includes: radio frequency capacity type mother unit and radio frequency cover type subelement；
Radio frequency capacity type mother's unit, for receiving and dispatching the digital baseband signal of baseband processing unit；
The radio frequency cover type subelement, for receiving the intermediate-freuqncy signal of radio frequency capacity type mother's unit, and by the intermediate-freuqncy signal
Radiofrequency signal is converted to, by the built-in antenna for being transmitted to radio frequency capacity type mother's unit after filter amplifier；
More than two external antenna interfaces are set inside the radio frequency capacity type mother unit, and the external antenna interface is for leading to
Cross the external more than two radio frequency cover type subelements of cable.
2. master and slave type remote radio unit (RRU) according to claim 1, which is characterized in that the radio frequency capacity type mother unit packet
It includes:
Radio frequency capacity type mother's unit is for being transmitted to baseband processing unit for digital baseband signal when receiving；
Radio frequency capacity type mother's unit is for being converted to intermediate-freuqncy signal for the digital baseband signal and radio frequency being believed when sending
Number, and the intermediate-freuqncy signal is sent to radio frequency cover type subelement, by the radiofrequency signal by being transmitted after filter amplifier
To the built-in antenna of radio frequency capacity type mother's unit.
3. master and slave type remote radio unit (RRU) according to claim 1 or 2, which is characterized in that the radio frequency capacity type is female single
Member includes:
Module for power supply unit for providing plate interior power by the power supply system based on local area network, and gives the radio frequency cover type
Subelement provides power supply；
Module clock unit, for being covered for the radio frequency capacity type mother unit and radio frequency from Ethernet interface extraction system clock
Cap-type subelement provides work clock and synchronised clock；
Module monitors administrative unit, it is each for monitoring and managing the radio frequency capacity type mother unit and radio frequency cover type subelement
The operation of module veneer；
Module interface unit is converted into analog baseband signal for handling digital baseband signal, and by digital baseband signal；
Module converter unit is converted to analog intermediate frequency signal for realizing by analog baseband signal；
Module digital processing element is converted to digital intermediate frequency signal for realizing analog intermediate frequency signal.
4. master and slave type remote radio unit (RRU) according to claim 1, which is characterized in that the radio frequency cover type subelement packet
It includes:
Converter unit, for intermediate-freuqncy signal to be converted to radiofrequency signal；
Digital processing element, for digital intermediate frequency signal to be converted to analog intermediate frequency signal.
5. master and slave type remote radio unit (RRU) according to claim 1 or 2, which is characterized in that the radio frequency capacity type is female single
Member includes: that the radio frequency capacity type mother unit containing Transmit Receive Unit or the radio frequency capacity type without Transmit Receive Unit are female single
Member, the Transmit Receive Unit include the built-in antenna of filter amplifier and radio frequency capacity type mother's unit.
6. master and slave type remote radio unit (RRU) according to claim 1, which is characterized in that the cable is Cat6A cable.
7. master and slave type remote radio unit (RRU) according to claim 1, which is characterized in that if radio frequency capacity type mother's unit
Continue to increase with the power and power consumption of radio frequency cover type subelement, light is used between expanding element and radio frequency capacity type mother's unit
Photoelectric compound cable connection.
8. master and slave type remote radio unit (RRU) according to claim 1, which is characterized in that use the master and slave type far end radio frequency
Unit realizes indoor depth covering, comprising the following steps:
Radio frequency capacity type mother's unit receives the digital baseband signal of baseband processing unit, and the digital baseband signal is turned
It is changed to intermediate-freuqncy signal and radiofrequency signal；
Intermediate-freuqncy signal is sent to radio frequency cover type subelement by the radio frequency capacity type mother unit, and the radiofrequency signal is passed through
The built-in antenna of radio frequency capacity type mother's unit is transmitted to after filter amplifier；
Intermediate-freuqncy signal is converted to radiofrequency signal by the radio frequency cover type subelement, and the radiofrequency signal is passed through filter and amplification
The built-in antenna of radio frequency capacity type mother's unit is transmitted to after device.
9. master and slave type remote radio unit (RRU) according to claim 8, which is characterized in that use the master and slave type far end radio frequency
Unit realizes indoor depth covering, comprising the following steps:
Radio frequency capacity type mother's unit when containing Transmit-Receive Unit, the radio frequency capacity type mother unit to radio frequency cover type subelement into
Row power supply and monitoring management；
When radio frequency capacity type mother's unit is free of Transmit-Receive Unit, radio frequency capacity type mother's unit is that radio frequency cover type is single
Member；
The Transmit Receive Unit includes: the built-in antenna of filter amplifier and radio frequency capacity type mother's unit.
10. the master and slave type remote radio unit (RRU) according to claim 8 or claim 9, which is characterized in that use the primary and secondary
Type remote radio unit (RRU) realizes indoor depth covering, comprising: meets default power reguirements and scheduled rate requirement.
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