CN101267251A - Distributed base station clock synchronization method and system - Google Patents
Distributed base station clock synchronization method and system Download PDFInfo
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- CN101267251A CN101267251A CNA2008100670370A CN200810067037A CN101267251A CN 101267251 A CN101267251 A CN 101267251A CN A2008100670370 A CNA2008100670370 A CN A2008100670370A CN 200810067037 A CN200810067037 A CN 200810067037A CN 101267251 A CN101267251 A CN 101267251A
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Abstract
The present invention discloses a clock synchronization method of a distributed base station system and a system thereof. An RRU receives a standard time, and the system clock of BBU is regulated through transmitting the standard time and the phase demodulation value of the BBU system time to the BBU. Thereby the system clock synchronizes all the RRU system clocks to obtain the purpose of clock synchronization of the distributed base station. The invention overcomes the problem of difficult installation when anciently the standard time receiving module is installed on the BBU thereby reducing the construction difficulty and disposition cost of the distributed base station. And various different network topological structures can be adapted.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the clock synchronizing method and the system thereof of distributed wireless base station system.
Background technology
Distributed base station generally passes through long-distance transmissions means (as optical fiber, cable etc.) with Base Band Unit (BBU, Base Band Unit) with a plurality of radio frequency unit (RRU that are placed on each needs place, Remote Radio Unit) couples together, when improving networking flexibility, reduce the maintenance cost of network.
But when using this framework networking, except a plurality of RRU being connected mutually with BBU according to certain topological structure (as Star network, Chain Network, ring-like net etc.), and finish on this basis outside the transmission of signaling between BBU and a plurality of RRU and data, also must realize the clock synchronization between BBU and a plurality of RRU.
For this reason, a kind of more common mode is to be obtained by BBU to broadcast to each RRU after gps signal generates its system clock as the reference clock again in the industry, reaches the synchronous of whole distributed base station system clock, and detailed process is as follows:
1) a GPS receiver module is installed on BBU, and its reception antenna is placed under the outdoor open-air environment by the feeder line of certain-length, to receive the faint gps signal from space, this GPS module is exported the clock signal of a high-precision 1pps after the received signal of locking space.
2) clock circuit of BBU as clock reference signal, generates new clock signal of system by phase-locked loop circuit (PLL, PhaseLocked Loop) with this signal.PLL circuit wherein by phase discriminator (PD, PhaseDetector), low pass filter (LPF, Low Pass Filter), voltage controlled oscillator (VCO, VoltageControlled Osciallator), frequency divider (Division) constitute.
3) BBU outputs to new clock signal of system on each RRU by the physical link interface between itself and the RRU.
4) after each RRU extracts the line clock of this system from the BBU-RRU interface, by phase-locked loop (PLL) circuit generation RRU system clock separately.
The advantage of this mode is the direct clock of generation system on BBU, and is simple for structure.But along with going deep into of urbanization and making rapid progress of urban construction, we will be in the reinforced concrete jungle certain a bit be outdoor reception antenna of BBU arrangement additional dedicated, and guarantee that it can receive high-quality time reference signal, this construction cost wherein and deployment difficulty all are very large.General in the industry way is by the standard time reception antenna being installed in as much as possible the attic in high relatively building, guarantees the quality of accepting of its signal.But this way is for most of cities, especially a line big city of an inch of land is an inch of gold, on the one hand, those higher high buildings all can be the important buildings in city, and it all is very expensive coming its building cost of use that need pay of extra installation code time reception antenna in these high buildings; Therefore on the other hand, BBU generally can not place the top layer position of building, even after having set up the standard time reception antenna, the construction cost of the feeder line between BBU and standard time reception antenna and the difficulty of construction also will be very big.Sometimes, even we have been placed on eminence as much as possible to the standard time reception antenna, the quality of reception of its signal also not necessarily all can be very desirable still more.
Summary of the invention
The technical problem to be solved in the present invention just provides a kind of new distributed base station clock synchronization method and system, the standard time receiver module is positioned on the RRU, adjust the system clock of BBU to the phase demodulation numerical value of BBU passback standard time and BBU system clock by RRU, and with the synchronous all RRU system clocks of this system clock, reach the clock synchronization purpose of distributed base station, to solve the difficulty of resettlement standard time reception antenna and feeder line on BBU at present.
In order to solve above-mentioned technical problem, the invention provides a kind of distributed base station clock synchronization method, this base station comprises Base Band Unit and radio frequency unit, and by believing that all link connects, this method may further comprise the steps:
A) described radio frequency unit acceptance criteria time signal is as the reference signal, and the clock signal of extracting described Base Band Unit is as sample signal;
B) described radio frequency unit carries out phase discrimination processing to reference signal and sample signal, obtains digitized phase demodulation numerical value;
C) described radio frequency unit passes to described Base Band Unit with described phase demodulation numerical value;
D) after described Base Band Unit carries out low-pass filtering treatment and digital-to-analogue conversion operation with described phase demodulation numerical value, the result is exported to voltage controlled oscillator, to produce new system clock;
E) described Base Band Unit sends to each radio frequency unit with new clock signal of system.
Further, said method also can have following characteristics: if sample signal described in the step 1 is different with described reference signal length, then described radio frequency unit carries out frequency division to sample signal to be handled, and makes it identical with described reference signal length.
Further, said method also can have following characteristics: the described radio frequency unit in the step 3 is delivered to described Base Band Unit by the control word in the communication link between itself and described Base Band Unit with described phase demodulation numerical value.
Further, said method also can have following characteristics: the described radio frequency unit in the step 3 is carrying out the CRC coding to phase demodulation numerical value earlier before described Base Band Unit transmits phase demodulation numerical value, and a CRC encoded radio of gained is delivered to described Base Band Unit together with phase demodulation numerical value; Described Base Band Unit carries out the CRC coding to phase demodulation numerical value after extracting described phase demodulation numerical value, then phase demodulation numerical value is carried out digital-to-analogue conversion and low-pass filtering operation if the 2nd CRC encoded radio of gained conforms to a CRC encoded radio of receiving, does not then give up if do not conform to.
Distributed base station clock system provided by the invention, this distributed base station comprises Base Band Unit and radio frequency unit, and connect by communication link, described Base Band Unit comprises low pass filter, D/A converter module and with its voltage controlled oscillator connected in series successively and frequency divider, it is characterized in that, described radio frequency unit also comprises the standard time receiver module, the line clock extraction module, phase discriminator module and identified result transport module, export reference signal to described phase discriminator module after described receiver module acceptance criteria time standard time, described Clock Extraction module is extracted behind the system clock of described Base Band Unit to described phase discriminator module output sample signal, described phase discriminator module carries out exporting identified result to the identified result transport module after the phase discrimination processing to above-mentioned two input signals, described Base Band Unit also comprises the identified result extraction module, it is connected with described identified result transport module with communication link between described radio frequency unit by described Base Band Unit, extraction comes from after the identified result of described radio frequency unit to described low pass filter and D/A converter module output, and handles the new system clock of back generation through voltage controlled oscillator and frequency divider.
Further, above-mentioned distributed base station clock system also can have following characteristics: described phase discriminator module adopts digital phase discriminator.
Further, described identified result transport module also comprises the CRC coding module, and described identified result is carried out the CRC coding, and a CRC encoded radio of gained is delivered to described Base Band Unit together with described phase demodulation numerical value; Described identified result extraction module comprises the CRC check module, and identified result is carried out the CRC coding, then exports to described low pass filter if the 2nd CRC encoded radio of gained conforms to a CRC encoded radio, does not then give up if do not conform to.
Therefrom we can know, distributed base station clock synchronization method provided by the invention and system, by distinctive the standard time receiver module is placed on the RRU, and adjust the system clock of BBU to the phase demodulation numerical value of BBU passback standard time and BBU system time by RRU, and with this system clock synchronously all RRU system clocks reach the clock synchronization purpose of distributed base station, can utilize on the one hand between existing BBU and the RRU communication link or on the communication link between existing BBU and the RRU stack extra channel carry out the signal transmission, overcome receive between the prior art acceptance of the bid is punctual module be placed on BBU when going up the standard time reception antenna and the installation difficulty of the feeder line between the BBU; And on the other hand, RRU generally can be placed on signal and receive local preferably, the present invention is by being placed on the RRU side to the standard time reception antenna, outside the cost of having saved the required expenditure of extra installation code signal receiving antenna, guaranteed to a certain extent that also the standard time accepts the signal receiving quality of antenna.And the enforcement technical scheme that the present invention comprised, even need be on a plurality of RRU all under the situation of installation code time receiver module, except the cost of the required expenditure of module itself, also can't additionally increase the lower deployment cost of whole distributed base station system, thereby reduced the difficulty of construction and the lower deployment cost of distributed base station on the whole, and good adaptive capacity has all been arranged for various network topology structure.
In addition,, also can obtain better filter effect by more common analog filter, thereby improve the accuracy that system clock produces if when enforcement is of the present invention, adopt digital filter.
In addition, when implementing the present invention and in identified result sending module and identified result extraction module, comprise the function of CRC coding and verification, also can improve the accuracy that information between BBU and the RRU is transmitted, prevent the generation of the system time distortion phenomenon that causes because of the data transmission problems between BBU and the RRU.
Description of drawings
Fig. 1 is the flow chart of distributed base station clock synchronization method provided by the invention
Fig. 2 is the functional block diagram of distributed base station clock system provided by the invention
Fig. 3 is the functional block diagram of the distributed base station clock system among the embodiment
Embodiment
Fig. 2 is the functional block diagram of distributed base station clock system provided by the invention, and this distributed base station comprises Base Band Unit and radio frequency unit two parts, and connects by the communication link between them.
Wherein Base Band Unit comprises identified result extraction module connected in series successively, D/A converter module, low pass filter, voltage controlled oscillator and frequency divider.Frequency divider sends to each RRU after producing system clock on the one hand, then provides system clock to the Clock Extraction module in the radio frequency unit on the other hand.
Radio frequency unit then comprises standard time receiver module, Clock Extraction module, phase discriminator module and identified result transport module, export to described phase discriminator module after receiver module acceptance criteria time standard time, the Clock Extraction module is extracted behind the system clock of described Base Band Unit to described phase discriminator module output, and the phase discriminator module is carried out after the phase discrimination processing to the output of identified result transport module above-mentioned two input signals, and the identified result transport module then is connected with identified result extraction module in the Base Band Unit by the communication link between Base Band Unit and radio frequency unit.
Fig. 3 provides a concrete realization of the present invention, and this distributed base station clock system comprises following module or circuit on one or some RRU:
1) GPS module: i.e. standard time receiver module among the present invention, the one end links to each other with outside reception antenna, the other end links to each other with phase discriminator, be responsible for to receive from the gps system signal of space and to the time reference signal of a 2pps length of phase discriminator output, certainly this module also can be other navigation information modules, as Galileo system module or triones navigation system module, signal (as the 2pps in this example) when the output signal of this module also both can be idol, signal (as 1pps) in the time of also can being strange;
2) Clock Extraction module: the one end links to each other with the interface circuit of RRU, extract the clock signal of system of the 2pps length of BBU by this interface circuit, the other end then links to each other with phase discriminator, export this system time signal to phase discriminator, certainly, when the standard time receiver module is exported the signal of 1pps length, then it can extract the clock signal of system of the 1pps length of BBU, also can still extract the clock signal of system of the 2pps length of BBU, and this signal is carried out frequency division obtain exporting to phase discriminator again behind the signal of 1pps length;
3) phase discriminator: i.e. phase discriminator module among the present invention, the one end is connected with the Clock Extraction module with the GPS module respectively, and the other end is connected with identified result coding transmission module in the interface circuit.Be responsible for the system time signal that time reference signal that the GPS module is sent here and Clock Extraction module send here and carry out phase discrimination processing, and identified result changed into the identified result coding transmission module in interface circuit sends after the digital signal.This phase discriminator adopts digital phase discriminator, and it is output as 2 opposite polarity pulse signals, and the cycle of this output signal is 1s, and the width of its pulse has reflected the phase difference of two signals.Usually use a high frequency clock to convert the width of this pulse signal to a digital signal.
4) interface circuit: comprise identified result transport module and CRC coding module among the present invention, the one end links to each other with phase discriminator, the other end then with BBU and RRU between communication link communicate, be responsible for phase demodulation numerical value is carried out the CRC coding of 8bit, obtain the CRC encoded radio of phase demodulation numerical value, and phase demodulation numerical value and this CRC encoded radio together, be delivered to BBU by the control word transmission manner.In addition, this interface circuit also provides data channel for the system clock of Clock Extraction module extraction BBU.
On BBU, then comprise following module or circuit:
1) interface circuit: comprised identified result extraction module and the CRC check module among the present invention, the one end communicates with communication link between BBU and the RRU, and the other end links to each other with digital to analog converter.It at first extracts phase demodulation numerical value and CRC encoded radio thereof that RRU passes over, then phase demodulation numerical value is carried out the CRC coding of 8bit, and compares with the CRC encoded radio that transmits, if the two conforms to and then exports to digital to analog converter, does not then give up if do not conform to.
2) low pass filter: adopt a digital iir filter to realize, comprised low pass filter and the D/A converter module among the present invention simultaneously, the one end links to each other with interface circuit, the other end links to each other with voltage controlled oscillator, be responsible for phase demodulation numerical value is carried out low-pass filtering, and convert filtered result to analog signal by a digital to analog converter and output to voltage controlled oscillator; Certainly, low pass filter wherein also can adopt the low pass filter of common analog signal, and then the phase demodulation numerical value that transmits of this part elder generation interface circuit carries out digital-to-analogue conversion in this case, and then carries out sending to voltage controlled oscillator after the low-pass filtering.
3) voltage-controlled oscillator circuit: the one end links to each other with low pass filter, and the other end links to each other with frequency divider.Be responsible under the effect of low-pass filter output signal, adjust the frequency of oscillation of output, to reach the purpose of adjusting phase place.
4) frequency divider: link to each other with voltage-controlled oscillator circuit, be responsible for receiving the frequency of oscillation of voltage controlled oscillator output, produce new system clock through frequency divider, and by the communication link between BBU and each RRU new clock signal of system is broadcast on each RRU, also offer the Clock Extraction module on the specific RRU.
Specifically, the distributed base station clock synchronization method of present embodiment realization may further comprise the steps:
The first step, gps signal receiver module on the RRU receive from the gps system signal of space and the reference signal of exporting a 1pps and give phase discriminator;
In second step, the Clock Extraction module on the RRU is extracted the line clock from BBU, and converts 1pps length clock signal to, exports to phase discriminator;
The 3rd cloth, the phase discriminator on the RRU carries out phase discrimination processing to above-mentioned two input signals, and identified result is changed into digital signal;
In the 4th step, the CRC coding module in the last interface circuit of RRU carries out the CRC coding to above-mentioned identified result numerical value, by the identified result transport module in the interface circuit identified result is delivered to BBU with the CRC encoded radio by the control word transmission manner then;
The 5th step, identified result extraction module in the last interface circuit of BBU extracts identified result and the CRC encoded radio thereof that RRU transmits up among the BBU-RRU interface, by the CRC check module in the interface circuit phase demodulation numerical value is carried out the CRC coding, and the CRC encoded radio that transmits with it is compared, if the two conforms to and then exports to low pass filter, then do not give up if do not conform to;
In the 6th step, the low pass filter on the BBU carries out low-pass filtering to this identified result after with the identified result of receiving, and outputs to voltage-controlled oscillator circuit after converting the result to analog signal by a digital to analog converter;
The 7th step, voltage-controlled oscillator circuit on the BBU is under the effect of the signal of low pass filter output, adjusting the frequency of oscillation of output gives frequency divider to produce new clock signal of system, new clock signal of system is launched into each RRU by the communication link between the BBU-RRU, finishes the clock synchronization of whole distributed base station.
Claims (7)
1, a kind of distributed base station clock synchronization method, this distributed base station comprises Base Band Unit and radio frequency unit, and connects by communication link, it is characterized in that this method may further comprise the steps:
1) described radio frequency unit acceptance criteria time signal is as the reference signal, and the clock signal of extracting described Base Band Unit is as sample signal;
2) described radio frequency unit carries out phase discrimination processing to reference signal and sample signal, obtains digitized phase demodulation numerical value;
3) described radio frequency unit passes to described Base Band Unit with described phase demodulation numerical value;
4) after described Base Band Unit carries out low-pass filtering treatment and digital-to-analogue conversion operation with described phase demodulation numerical value, the result is exported to voltage controlled oscillator, to produce new system clock;
5) described Base Band Unit sends to each radio frequency unit with new clock signal of system.
2, the method for claim 1 is characterized in that, if sample signal described in the step 1 is different with described reference signal length, then described radio frequency unit carries out frequency division to sample signal to be handled, and makes it identical with described reference signal length.
3, the method for claim 1 is characterized in that, the described radio frequency unit in the step 3 is delivered to described Base Band Unit by the control word in the communication link between itself and described Base Band Unit with described phase demodulation numerical value.
4, the method for claim 1, it is characterized in that, described radio frequency unit in the step 3 is carrying out the CRC coding to phase demodulation numerical value earlier before described Base Band Unit transmits phase demodulation numerical value, and a CRC encoded radio of gained is delivered to described Base Band Unit together with phase demodulation numerical value; Described Base Band Unit carries out the CRC coding to phase demodulation numerical value after extracting described phase demodulation numerical value, then phase demodulation numerical value is carried out digital-to-analogue conversion and low-pass filtering operation if the 2nd CRC encoded radio of gained conforms to a CRC encoded radio of receiving, does not then give up if do not conform to.
5, a kind of distributed base station clock system, this distributed base station comprises Base Band Unit and radio frequency unit, and connect by communication link, described Base Band Unit comprises low pass filter, D/A converter module and with its voltage controlled oscillator connected in series successively and frequency divider, it is characterized in that, described radio frequency unit also comprises and receives module between standard time clock, the line clock extraction module, phase discriminator module and identified result transport module, export reference signal to described phase discriminator module after described receiver module acceptance criteria time standard time, described line clock extraction module extracts behind the system clock of described Base Band Unit to described phase discriminator module output sample signal, described phase discriminator module carries out exporting identified result to the identified result transport module after the phase discrimination processing to above-mentioned two input signals, described Base Band Unit also comprises the identified result extraction module, it is connected with described identified result transport module with communication link between described radio frequency unit by described Base Band Unit, extraction comes from after the identified result of described radio frequency unit to described low pass filter and D/A converter module output, and handles the new system clock of back generation through voltage controlled oscillator and frequency divider.
6, distributed base station clock system as claimed in claim 5 is characterized in that, described phase discriminator module adopts digital phase discriminator.
7, distributed base station clock system as claimed in claim 5, it is characterized in that, described identified result transport module also comprises the CRC coding module, described identified result is carried out the CRC coding, and a CRC encoded radio of gained is delivered to described Base Band Unit together with described phase demodulation numerical value; Described identified result extraction module comprises the CRC check module, and identified result is carried out the CRC coding, then exports to described low pass filter if the 2nd CRC encoded radio of gained conforms to a CRC encoded radio, does not then give up if do not conform to.
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