CN104982078A - Clock synchronization method, device, and eRelay remote node (RRN) - Google Patents

Clock synchronization method, device, and eRelay remote node (RRN) Download PDF

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Publication number
CN104982078A
CN104982078A CN201380003170.9A CN201380003170A CN104982078A CN 104982078 A CN104982078 A CN 104982078A CN 201380003170 A CN201380003170 A CN 201380003170A CN 104982078 A CN104982078 A CN 104982078A
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China
Prior art keywords
rrn
clock information
network nodes
local clock
frequency
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CN201380003170.9A
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Chinese (zh)
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郭峰
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Abstract

The embodiments of the present invention disclose a clock synchronization method, device, and eRelay Remote Node (RRN), time synchronization being performed between the RRN and a base station (eRelay BS); the RRN sends the time-synchronized local clock information to a lower-level network node of said RRN to enable said lower-level network node to maintain clock synchronization with said RRN on the basis of said received local clock information.

Description

Clock synchronization method, device, and eRelay remote node (RRN)
Clock synchronizing method, device and RRN
The present invention relates to the communications field for technical field, and in particular to a kind of clock synchronizing method, device and relaying remote node（ERelay Remote Node abbreviation RRN).Background technology
With the popularization of intelligent terminal and enriching for mobile broadband service, network traffics are constantly incremental so that requirement to network load ability also more and more higher, can lift network capacity by eRelay solutions, specifically, the eRelay solutions are by disposing base station（Base station, abbreviation BS) and RRN lift network capacity, and then improve network load ability.
But, existing eRelay solutions are when realizing that clock is synchronous, and local clock information is packaged into the precision interval clock synchronous protocol standard of network measure and control system by clock server（IEEE 1588V2) message transmissions are to BS, BS is by the V2 message transmissions of IEEE 1588 to RRN, IEEE 1588V2 messages are sent to offspring network nodes by RRN again, and offspring network nodes are based on that IEEE 1588V2 messages are synchronous with the clock server retention time and Frequency Synchronization.But because clock server is distant with offspring network nodes, the V2 message transmissions paths of IEEE 1588 are longer, time delay increase causes the precision reduction that clock server is synchronous with the clock of offspring network nodes.The content of the invention
The embodiment of the present application can effectively reduce time delay, and improve the synchronous precision of clock by providing a kind of clock synchronizing method, device and RRN.
According to the first aspect of the invention there is provided a kind of clock synchronizing method, methods described includes：Time synchronized is carried out between RRN and BS；
The local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, so that the offspring network nodes keep clock synchronous based on the local clock information received with the RRN. With reference in a first aspect, in the first possible implementation, the clock synchronously includes time synchronized and/or Frequency Synchronization.
With reference to first aspect or the first possible implementation, in second of possible implementation, the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, specifically includes：The RRN is encoded the local clock information, wherein, the local clock information includes master clock frequency；The local clock information after coding is sent to the offspring network nodes, to cause the offspring network nodes synchronous with the RRN keep frequencies based on the local clock information after coding.
With reference to first aspect or the first possible implementation, in the third possible implementation, the local clock information includes master clock frequency, and the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN, specifically included by the RRN：The absolute value of the master clock frequency is packaged into Frequency Synchronization message by the RRN；The Frequency Synchronization message is sent to the offspring network nodes, to cause the offspring network nodes are based on the Frequency Synchronization message synchronous with the RRN keep frequencies.
With reference to first aspect or the first possible implementation, in the 4th kind of possible implementation, the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, specifically includes：The local clock information is packaged into clock sync message by the RRN, wherein, the local clock information includes master clock frequency and fiducial time；The clock sync message is sent to the offspring network nodes, with cause the offspring network nodes be based on the clock sync message with the RRN keep frequencies synchronous and time synchronized.
According to second aspect there is provided a kind of clock synchronization apparatus, described device includes：
Receiving unit, the time synchronization information for receiving BS transmissions；
Time synchronized unit, for receiving the time synchronization information that the receiving unit is sent, according to the time synchronization information, carries out time synchronized by described device and the BS, obtains the local clock information carried out after time synchronized；
Transmitting element, for receiving the local clock information that the time synchronized unit is sent, the local clock information is sent to the offspring network nodes of described device, so that the offspring network nodes base Keep clock synchronous with described device in the local clock information received.
With reference to second aspect, in the first possible implementation, the clock synchronously includes time synchronized and/or Frequency Synchronization.
With reference to second aspect or the first possible implementation, in second of possible implementation, described device also includes coding unit, for before the transmitting element sends the local clock information, the local clock information is encoded, wherein, the local clock information includes master clock frequency；The transmitting element, specifically for the local clock information after coding is sent into the offspring network nodes, to cause the offspring network nodes synchronous with described device keep frequency based on the local clock information after coding.
With reference to second aspect or the first possible implementation, in the third possible implementation, the local clock information includes master clock frequency, and described device also includes frequency encapsulation unit；The frequency encapsulation unit, for before the transmitting element sends the local clock information, the absolute value of the master clock frequency to be packaged into Frequency Synchronization text；The transmitting element, specifically for the Frequency Synchronization message is sent into the offspring network nodes, to cause the offspring network nodes are based on the Frequency Synchronization message synchronous with described device keep frequency.
With reference to second aspect or the first possible implementation, in the 4th kind of possible implementation, described device also includes clock encapsulation unit, for before the transmitting element sends the local clock information, the local clock information is packaged into clock sync message, wherein, the local clock information includes master clock frequency and fiducial time；The transmitting element, specifically for the clock sync message is sent into the offspring network nodes, with cause the offspring network nodes be based on the clock sync message with described device keep frequency synchronous and time synchronized.
Included according to the third aspect there is provided a kind of RRN, the RRN：
Receiver, the time synchronization information for receiving BS transmissions；
Processor, for according to the time synchronization information, the RRN and BS to be carried out into time synchronized, obtains the local clock information carried out after time synchronized；
Transmitter, the offspring network nodes for the local clock information to be sent to the RRN, so that the offspring network nodes keep clock same based on the local clock information received with the RRN Step.
With reference to the third aspect, in the first possible implementation, the clock synchronously includes time synchronized and/or Frequency Synchronization.
With reference to the first possible implementation of the third aspect, in second of possible implementation, the processor, for before the transmitter sends the local clock information, the local clock information is encoded, wherein, the local clock information includes master clock frequency；The transmitter, specifically for the local clock information after coding is sent into the offspring network nodes, to cause the offspring network nodes synchronous with the RRN keep frequencies based on the local clock information after coding.
With reference to the third aspect or the first possible implementation, in the third possible implementation, the processor, for before the transmitter sends the local clock information, the absolute value of the master clock frequency in the local clock information to be packaged into Frequency Synchronization message；The transmitter, it is specific with synchronous with the RRN keep frequencies based on the Frequency Synchronization message.
With reference to the third aspect or the first possible implementation, in the 4th kind of possible implementation, the processor, for before the transmitter sends the local clock information, the local clock information is packaged into clock sync message, wherein, the local clock information include master clock frequency and basic point, with cause the offspring network nodes be based on the clock sync message with the RRN keep frequencies synchronous and time synchronized.
The present invention has the beneficial effect that：
In the embodiment of the present invention, time synchronized is carried out between RRN and BS, compared with RRN in the prior art is only used for transmission clock information, RRN directly transmits clock information to the offspring network nodes, so that the distance of clock information transmission shortens, propagation delay time reduction；In addition, local clock information after time synchronized is sent to the offspring network nodes of the RRN by RRN so that offspring network nodes keep clock synchronous based on local clock information with RRN, therefore, when time delay is reduced, the synchronous precision of clock is improved. Brief description of the drawings
Fig. 1 is the method flow diagram of clock synchronizing method in the embodiment of the present invention；
Fig. 2 is the system architecture diagram of RRN, eRelay BS and offspring network nodes in the embodiment of the present invention；Fig. 3 is the structure chart of clock synchronization apparatus in the embodiment of the present invention；
The structure chart that Fig. 4 is RRN in the embodiment of the present invention.Embodiment
For existing eRelay solutions when realizing that clock is synchronous, there is time delay big, the low technical problem of the synchronous precision of clock, time synchronized is carried out between RRN and BS in technique proposed herein scheme of the embodiment of the present invention, compared with RRN in the prior art is only used for transmission clock information, RRN directly transmits clock information to the offspring network nodes so that the distance of clock information transmission shortens, propagation delay time reduction；In addition, local clock information after time synchronized is sent to the offspring network nodes of the RRN by RRN so that offspring network nodes keep clock synchronous based on local clock information with RRN, therefore, when time delay is reduced, the synchronous precision of clock is improved.
To the main realization principle of technical scheme of the embodiment of the present invention, embodiment and its beneficial effect that should be able to be reached is set forth in reference to each accompanying drawing.
The embodiment of the present invention proposes a kind of clock synchronizing method, as shown in Fig. 1, and this method concrete processing procedure is as follows：
Step S101:Time synchronized is carried out between relaying remote node R RN and base station BS；
Step S102:The local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, so that the offspring network nodes keep clock synchronous based on the local clock information received with the RRN.
Wherein, in step S101, time synchronized is carried out between RRN and BS.
In specific implementation process, the RRN passes through air interface（Eat dishes without rice or wine）Pilot channel and synchronizing channel it is synchronous with the BS deadlines, the RRN receives the PN codes of upper transmissions of the BS in pilot channel（Pseudo-Noise Code), and receive the upper transmission of the BS in synchronizing channel Time synchronized data, based on the PN codes and the time synchronized data so that the RRN and BS carries out time synchronized, the RRN can determine the local clock information of the RRN after time synchronized is carried out.
Specifically, the BS described in eRelay solutions can be represented with eRelay BS, that is, the BS in the embodiment of the present application is caused to represent that BS below is represented with eRelay BS with eRelay BS.
Specifically, between the RRN and the eRelay BS after progress Frequency Synchronization, time synchronized could be realized by carrying out Phase synchronization again, characterize between the RRN and the eRelay BS after progress time synchronized, the RRN is also synchronous with the frequency of the eRelay BS.
Next step S 102 is performed, in this step, the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, so that the offspring network nodes keep clock synchronous based on the local clock information received with the RRN.
Wherein, the local clock information at least includes clock frequency, and the clock frequency is, for example, 122.88MHz, 500MHz etc., can also include clock phase, it is 2,5,10 microseconds that the clock phase, which is, for example,（μδ) etc..
In specific implementation process, the RRN is encoded the local clock information, wherein, the local clock information includes master clock frequency, the local clock information after coding is sent to the offspring network nodes, to cause the offspring network nodes synchronous with the RRN keep frequencies based on the local clock information after coding.
Specifically, after step S101 is performed, the RRN is encoded in physical layer to the local clock information, then the local clock information after coding is transmitted to the offspring network nodes by physical link, to cause the offspring network nodes by being decoded to the local clock information after coding, according to decoded information so that RRN is synchronous with the offspring network nodes keep frequency.
Specifically, the offspring network nodes can be the other eRelay BSs different from the eRelay BS, server, personal computer, small base station（Small cell) etc. electronic equipment, the RRN will compile the Ethernet interface of node, and then the ethernet physical layer chip by the offspring network nodes is according to connecing The modulation code stream received recovers original ether network packet and line clock, according to the line clock, so that the local clock of the undernet and the RRN clock keep frequency are synchronous.
For example, referring to Fig. 2, RRN1 carries out time synchronized by eating dishes without rice or wine between eRelay BS, after time synchronized is carried out, RRN1 can determine RRN1 the first clock information, first clock information for example comprising master clock frequency be 122.88MHz, and RR1 is encoded in physical layer to first clock information, first clock information after being encoded, and first clock information after coding is transferred to small cell-1 in serial transmission mode by physical link, small cell-1 receive the serial data bit stream of RR1 transmission, RRN1 first clock information is extracted and tracked by decoding the serial data bit stream, so that small cell-1 are synchronous with RRN1 keep frequencies according to decoded information.
Wherein, RRN2 carries out time synchronized by eating dishes without rice or wine between eRelay BS, after time synchronized is carried out, RRN2 can determine RRN2 second clock information, the second clock information for example comprising master clock frequency be 500 MHz, and RR2 is encoded in physical layer to the second clock information, the second clock information after being encoded, and the second clock information after coding is transferred to small cell-2 in serial transmission mode by physical link, small cell-2 receive the serial data bit stream of RR2 transmission, the RRN2 second clock information is extracted and tracked by decoding the serial data bit stream, enable small cell-2 synchronous with RRN2 keep frequencies according to decoded information.
In specific implementation process, the local clock information includes master clock frequency, and the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN, specifically included by the RRN：It is " literary that the absolute value of the master clock frequency is packaged into Frequency Synchronization by the RRN；The Frequency Synchronization message is sent to the offspring network nodes, to cause the offspring network nodes are based on the Frequency Synchronization message synchronous with the RRN keep frequencies.
Specifically, after step S101 is performed, the RRN extracts the master clock frequency in the local clock information first, and the absolute value of the master clock frequency is packaged into the blunt text of Frequency Synchronization 4, the Frequency Synchronization message can be received with offspring network nodes, the master clock frequency in the Frequency Synchronization message is extracted, based on the master clock frequency, the offspring network nodes are synchronous with the RRN keep frequencies. For example, referring to Fig. 2, RRN1 carries out time synchronized by eating dishes without rice or wine between eRelay BS, after time synchronized is carried out, RRN1 can determine RRN1 the first clock information, then the first master clock frequency is extracted from first clock information, first master clock frequency is, for example, 122.88MHz, and the absolute value of first master clock frequency is packaged into first frequency synchronous " ^ texts, and and the first frequency sync message is transmitted to small cell-1 by physical link, to enable small cell- 1 to receive the first frequency sync message, extract first master clock frequency in the first frequency sync message, based on first master clock frequency, so that small cell-1 are synchronous with RRN1 keep frequencies.
Further, RRN2 carries out time synchronized by eating dishes without rice or wine between eRelay BS, in progress time synchronized and afterwards, RRN2 can determine RRN2 second clock information, then from the master clock frequency of second clock information extraction second, second master clock frequency is, for example, 500MHz, and the absolute value of second master clock frequency is packaged into second frequency sync message, and transmitted the second frequency sync message to small cell-2 by physical link, to enable small cell-2 to receive the second frequency sync message, extract second master clock frequency in the second frequency sync message, based on second master clock frequency, so that small cell-2 are synchronous with RRN2 keep frequencies.
In specific implementation process, the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, specifically includes：The local clock information is packaged into clock sync message by the RRN, wherein, the local clock information includes master clock frequency and fiducial time；The clock sync message is sent to the offspring network nodes, to cause the offspring network nodes to be based on the blunt literary synchronous and time synchronizeds with the RRN keep frequencies of clock synchronization ^.
Wherein, the master clock frequency is, for example, 122.88MHz, 500 MHz, 280 MHz etc., and further, the fiducial time can be indicated with timestamp.
Specifically, after step S101 is performed, the RRN encapsulates the local clock information based on asymmetric delay dynamic compensation (IEEE 1588V2) agreement, obtain 1588V2 clocks text, and send the 1588V2 clock messages to the offspring network nodes, to cause the offspring network nodes to be based on the blunt literary synchronous and time synchronizeds with the RRN keep frequencies of the 1588V2 clocks ^.
After due to carrying out Frequency Synchronization between the RRN and the offspring network nodes, then carry out Phase synchronization and could realize time synchronized, that is, characterize and the time is carried out between the RRN and the offspring network nodes After synchronization, the RRN be also with the frequency of the offspring network nodes it is synchronous, so so that the offspring network nodes be based on the 1588V2 clock messages it is synchronous with the RRN retention times.
Specifically, the RRN periodically blunt texts of issue 1588V2 clocks 4, because the 1588V2 clock messages have accurate timestamp information, so that the timestamp information in the 1588V2 clock messages that the offspring network nodes are sent according to the RRN, the RRN is calculated to the time delay of the circuit of the offspring network nodes, and the RRN is to the time difference of the offspring network nodes, and the local zone time of the offspring network nodes is adjusted using the time delay and the time difference, the offspring network nodes are made to keep frequency and phase with the RRN time consistencies, and then make it that the RRN is synchronous with the offspring network nodes retention time.
For example, referring to Fig. 2, RRN1 carries out time synchronized by eating dishes without rice or wine between eRelay BS, after time synchronized is carried out, RRN1 can determine RRN1 the first clock information, according to first clock information, periodically 1588V2 clock messages are issued to small cell-1, and then cause timestamp information in 1588V2 clock messages that small cell-1 are issued according to RRN1, calculate the time delay of RRN1 to small cell-1 circuits, and RRN1 to small cell-1 time difference, and utilize the time delay and time difference adjustment small cell-1 local zone time, the small cell-1 are made to keep frequency and phase with RRN1 time consistencies, and then make it that RRN1 is synchronous with the small cell-1 retention times.
Further, RRN2 carries out time synchronized and Frequency Synchronization by eating dishes without rice or wine between eRelay BS, after time synchronized and Frequency Synchronization is carried out, RRN2 can determine RRN2 second clock information, according to the second clock information, periodically 1588V2 clock messages are issued to small cell-2, and then cause timestamp information in 1588V2 clock messages that small cell-2 are issued according to RRN2, calculate the time delay of RRN2 to small cell-2 circuits, and RRN2 to small cell-2 time difference, and utilize the time delay and time difference adjustment small cell-2 local zone time, the small cell-2 are made to keep frequency and phase with RRN2 time consistencies, and then make it that RRN2 is synchronous with the small cell-2 retention times.
In another embodiment, in order to further improve the RRN and eRelay BS timing tracking accuracy, clock server can be arranged in the eRelay BS, so cause the RRN by eat dishes without rice or wine with it is describedeReiaWhen y BS carry out time synchronized, the RRN and eRelay BS are improved Timing tracking accuracy so that the local clock information of the RRN is more accurate, and then make it that precision synchronous with the clock of the undernet RRN is also improved when the RRN and offspring network nodes are entering row clock step.
Further, the RRN and the offspring network nodes can be disposed with site, and then cause the closer to the distance of the RRN and the offspring network nodes, and propagation delay time is small so that Frequency Synchronization precision is higher.
Further, the RRN typically uses direct-connected scheme with the offspring network nodes, and no intermediate forwarding devices, in the absence of network rebuilding problem, simplify step.
In the embodiment of the present invention, time synchronized is carried out between RRN and eRelay BS, compared with RRN in the prior art is only used for transmission clock information, RRN directly transmits clock information to the offspring network nodes, so that the distance of clock information transmission shortens, propagation delay time reduction；In addition, local clock information after time synchronized is sent to the offspring network nodes of the RRN by RRN so that offspring network nodes keep clock synchronous based on local clock information with RRN, therefore, when time delay is reduced, the synchronous precision of clock is improved.
In addition, in the prior art because RRN and eRelay BS are transmission clock information, and the RRN and the eRelay BS are by air interface transmission, so that clock information is needed by eating dishes without rice or wine to be transmitted, reliability and stability are influenceed larger by wireless environment, quality to wireless carrier network relies on too strong, if the service quality for passback of eating dishes without rice or wine（Quality of Service, abbreviation QoS) it can not ensure, then Frequency Synchronization effect can be excessively poor, and by eating dishes without rice or wine to enter row clock with the eRelay BS synchronous by RRN described in the embodiment of the present application, the local clock information is transferred to offspring network nodes by the RRN by physical link again, so that the RRN is transmitted with clock information by physical link, and the physical link belongs to wire medium, and clock information is when wire medium is transmitted, with more preferable stability, reliability is also higher, compared with prior art, present techniques mode transmits clock information by wire medium, the synchronous precision of clock can further be improved.
Based on technical concept same as mentioned above, the embodiment of the present application also provides a kind of clock synchronization apparatus, and referring to Fig. 3, described device includes：
Receiving unit 301, the time synchronization information for receiving BS transmissions； Described device and the BS, according to the time synchronization information, are carried out time synchronized, obtain the local clock information carried out after time synchronized by time synchronized unit 302, the time synchronization information for receiving the transmission of receiving unit 301；
Transmitting element 303, the local clock information for receiving the transmission of time synchronized unit 302, the local clock information is sent to the offspring network nodes of described device, so that the offspring network nodes keep clock synchronous based on the local clock information received with described device.
Specifically, the BS described in eRelay solutions can be represented with eRelay BS, that is, the BS in the embodiment of the present application is caused to represent that BS below is represented with eRelay BS with eRelay BS.
Specifically, receiving unit 301, for receiving PN codes of the eRelay BS in the upper transmission of pilot channel, and receive the time synchronized data of upper transmissions of the eRelay BS in synchronizing channel, based on the PN codes and the time synchronized data, so that described device and the eRelay BS carry out time synchronized, described device is after time synchronized is carried out, and then the local clock information of described device can be determined, wherein, the time synchronization information includes the PN codes and the time synchronized data.
Specifically, between described device and the eRelay BS after progress Frequency Synchronization, time synchronized could be realized by carrying out Phase synchronization again, that is, be characterized between described device and the eRelay BS after progress time synchronized, described device is also synchronous with the frequency of the eRelay BS.
Preferably, the clock synchronously includes time synchronized and/or Frequency Synchronization.
Preferably, described device also includes coding unit 304, for before transmitting element 303 sends the local clock information, the local clock information to be encoded, wherein, the local clock information includes master clock frequency；Transmitting element 303, specifically for the local clock information after coding is sent into the offspring network nodes, to cause the offspring network nodes synchronous with described device keep frequency based on the local clock information after coding.
Specifically, coding unit 304, specifically for being encoded in physical layer to the local clock information, then the local clock information after coding is transmitted to the offspring network nodes by physical link, to cause the offspring network nodes by being decoded to the local clock information after coding, according to decoded information so that described device is synchronous with the offspring network nodes keep frequency. Preferably, the local clock information includes master clock frequency, described device also includes frequency encapsulation unit 305, for before transmitting element 303 sends the local clock information, the absolute value of the master clock frequency to be packaged into Frequency Synchronization message；Transmitting element 303, specifically for the Frequency Synchronization message is sent into the offspring network nodes, to cause the offspring network nodes are based on the Frequency Synchronization message synchronous with described device keep frequency.
Specifically, frequency encapsulation unit 305, specifically for extracting the master clock frequency in the local clock information, and the absolute value of the master clock frequency is packaged into Frequency Synchronization text, and by physical link by the Frequency Synchronization message transmissions to the offspring network nodes, to enable the offspring network nodes to receive the Frequency Synchronization message, extract the master clock frequency in the Frequency Synchronization message, based on the master clock frequency, the offspring network nodes are synchronous with described device keep frequency.
Preferably, described device also includes clock encapsulation unit 306, for before transmitting element 303 sends the local clock information, the local clock information to be packaged into clock sync message, wherein, the local clock information includes master clock frequency and fiducial time；Transmitting element 303, specifically for the clock sync message is sent into the offspring network nodes, with cause the offspring network nodes be based on the clock sync message with described device keep frequency synchronous and time synchronized.
Wherein, the master clock frequency is, for example, 122.88MHz, 500 MHz, 280 MHz etc., and further, the fiducial time can be indicated with timestamp.
Specifically, clock encapsulation unit 306, specifically for encapsulating the local clock information by IEEE 1588V2 agreements, obtain 1588V2 clocks text, and 1588V2 clocks text is sent to the offspring network nodes, with cause the offspring network nodes be based on the 1588V2 clock messages with described device keep frequency synchronous and time synchronized.
In the embodiment of the present invention, time synchronized is carried out between RRN and eRelay BS, compared with RRN in the prior art is only used for transmission clock information, RRN directly transmits clock information to the offspring network nodes, so that the distance of clock information transmission shortens, propagation delay time reduction；In addition, local clock information after time synchronized is sent to the offspring network nodes of the RRN by RRN so that offspring network nodes keep clock synchronous based on local clock information with RRN, therefore, when time delay is reduced, the synchronous precision of clock is improved. In addition, in the prior art because RRN and eRelay BS are transmission clock information, and the RRN and the eRelay BS are by air interface transmission, so that clock information is needed by eating dishes without rice or wine to be transmitted, reliability and stability are influenceed larger by wireless environment, and the quality to wireless carrier network relies on too strong, if QoS can not ensure, then Frequency Synchronization effect can be excessively poor, and RRN described in the embodiment of the present application by eat dishes without rice or wine with it is describedeReiaIt is synchronous that y BS enter row clock, the local clock information is transferred to offspring network nodes by the RRN by physical link again, so that the RRN is transmitted with clock information by physical link, and the physical link belongs to wire medium, and clock information is when wire medium is transmitted, with more preferable stability, reliability is also higher, compared with prior art, present techniques mode transmits clock information by wire medium, can further improve the synchronous precision of clock.
Based on technical concept same as mentioned above, the embodiment of the present application also provides a kind of RRN, referring to Fig. 4, and the RRN includes：
Receiver 401, the time synchronization information for receiving BS transmissions；
Processor 402, for according to the time synchronization information, the RRN and eRelay BS to be carried out into time synchronized, obtains the local clock information carried out after time synchronized；
Transmitter 403, the offspring network nodes for the local clock information to be sent to the RRN, so that the offspring network nodes keep clock synchronous based on the local clock information received with the RRN.
Wherein, receiver 401 is, for example, WIFI module, and the electronic equipment such as antenna, further, processor 402 are, for example, single process chip, can also be integrated in RRN in processor.
Further, transmitter 403 is, for example, WIFI module, the electronic equipment such as antenna.
Specifically, the BS described in eRelay solutions can be represented with eRelay BS, that is, the BS in the embodiment of the present application is caused to represent that BS below is represented with eRelay BS with eRelay BS.
Specifically, receiver 401, for receiving PN codes of the eRelay BS in the upper transmission of pilot channel, and the time synchronized data of upper transmissions of the eRelay BS in synchronizing channel are received, based on the PN codes and the time synchronized data so that described device and the eRelay BS carry out time synchronized, described device is after time synchronized is carried out, and then the local clock information of described device can be determined, wherein The time synchronization information includes the PN codes and the time synchronized data.
Specifically, between described device and the eRelay BS after progress Frequency Synchronization, time synchronized could be realized by carrying out Phase synchronization again, that is, be characterized between described device and the eRelay BS after progress time synchronized, described device is also synchronous with the frequency of the eRelay BS.
Preferably, the clock synchronously includes time synchronized and/or Frequency Synchronization.
Preferably, processor 402, for before transmitter 403 sends the local clock information, the local clock information to be encoded, wherein, the local clock information includes master clock frequency；Transmitter 403, specifically for the local clock information after coding is sent into the offspring network nodes, to cause the offspring network nodes synchronous with the RRN keep frequencies based on the local clock information after coding.
Specifically, processor 402, specifically for being encoded in physical layer to the local clock information, then the local clock information after coding is transmitted to the offspring network nodes by physical link, to cause the offspring network nodes by being decoded to the local clock information after coding, according to decoded information so that RRN is synchronous with the offspring network nodes keep frequency.
Preferably, processor 402, for before transmitter 403 sends the local clock information, the absolute value of the master clock frequency in the local clock information to be packaged into the blunt texts of Frequency Synchronization ^；So that the offspring network nodes are synchronous with the RRN keep frequencies based on the Frequency Synchronization message.
Specifically, processor 402, specifically for extracting the master clock frequency in the local clock information, and the absolute value of the master clock frequency is packaged into Frequency Synchronization message, and by physical link by the Frequency Synchronization message transmissions to the offspring network nodes, to enable the offspring network nodes to receive the Frequency Synchronization message, extract the master clock frequency in the Frequency Synchronization message, based on the master clock frequency, the offspring network nodes are synchronous with the RRN keep frequencies.
Preferably, processor 402, for before transmitter 403 sends the local clock information, the local clock information to be packaged into clock sync message, wherein, the local clock information includes master clock frequency and fiducial time； So that the offspring network nodes are based on, the clock sync message is synchronous with the RRN keep frequencies and time synchronized.
Wherein, the master clock frequency is, for example, 122.88MHz, 500 MHz, 280 MHz etc., and further, the fiducial time can be indicated with timestamp.
Specifically, processor 402, specifically for encapsulating the local clock information by IEEE 1588V2 agreements, obtain 1588 V2 clock messages, and the 1588V2 clock messages are sent to the offspring network nodes, with cause the offspring network nodes be based on the 1588V2 clock messages with the RRN keep frequencies synchronous and time synchronized.
In the embodiment of the present invention, time synchronized is carried out between RRN and eRelay BS, compared with RRN in the prior art is only used for transmission clock information, RRN directly transmits clock information to the offspring network nodes, so that the distance of clock information transmission shortens, propagation delay time reduction；In addition, local clock information after time synchronized is sent to the offspring network nodes of the RRN by RRN so that offspring network nodes keep clock synchronous based on local clock information with RRN, therefore, when time delay is reduced, the synchronous precision of clock is improved.
In addition, in the prior art because RRN and eRelay BS are transmission clock information, and the RRN and the eRelay BS are by air interface transmission, so that clock information is needed by eating dishes without rice or wine to be transmitted, reliability and stability are influenceed larger by wireless environment, and the quality to wireless carrier network relies on too strong, if QoS can not ensure, then Frequency Synchronization effect can be excessively poor, and RRN described in the embodiment of the present application by eat dishes without rice or wine with it is describedeReiaIt is synchronous that y BS enter row clock, the local clock information is transferred to offspring network nodes by the RRN by physical link again, so that the RRN is transmitted with clock information by physical link, and the physical link belongs to wire medium, and clock information is when wire medium is transmitted, with more preferable stability, reliability is also higher, compared with prior art, present techniques mode transmits clock information by wire medium, can further improve the synchronous precision of clock.
It will be understood by those skilled in the art that embodiments of the invention can be provided as method, device（Equipment）Or computer program product.Therefore, the form of the embodiment in terms of the present invention can use complete hardware embodiment, complete software embodiment or combine software and hardware.Moreover, the present invention can be used (includes but is not limited to disk in one or more computer-usable storage mediums for wherein including computer usable program code Memory, CD-ROM, optical memory etc.）The form of the computer program product of upper implementation.
The present invention is with reference to method according to embodiments of the present invention, device（Equipment）Described with the flow chart and/or block diagram of computer program product.It should be understood that can by the flow in each flow and/or square frame and flow chart and/or block diagram in computer program instructions implementation process figure and/or block diagram and/or square frame combination.These computer program instructions can be provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices to produce a machine so that produce the device for being used for realizing the function of specifying in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames by the instruction of the computing device of computer or other programmable data processing devices.
These computer program instructions may be alternatively stored in the computer-readable memory that computer or other programmable data processing devices can be guided to work in a specific way, so that the instruction being stored in the computer-readable memory, which is produced, includes the manufacture of command device, the command device realizes the function of being specified in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices, so that series of operation steps is performed on computer or other programmable devices to produce computer implemented processing, so that the instruction performed on computer or other programmable devices provides the step of being used to realize the function of specifying in one flow of flow chart or multiple flows and/or one square frame of block diagram or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creative concept, then other change and modification can be made to these embodiments.So, appended claims are intended to be construed to include preferred embodiment and fall into having altered and changing for the scope of the invention.The spirit and scope of invention.So, if these modifications and variations of the present invention belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to comprising including these changes and modification.

Claims (8)

  1. Claim
    1st, a kind of clock synchronizing method, it is characterised in that methods described includes：
    Time synchronized is carried out between relaying remote node R RN and base station BS；
    The local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, so that the offspring network nodes keep clock synchronous based on the local clock information received with the RRN.
    2nd, the method as described in claim 1, it is characterised in that the clock synchronously includes time synchronized and/or Frequency Synchronization.
    3rd, method as claimed in claim 1 or 2, it is characterised in that the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, specifically includes：
    The RRN is encoded the local clock information, wherein, the local clock information includes master clock frequency；
    The local clock information after coding is sent to the offspring network nodes, to cause the offspring network nodes synchronous with the RRN keep frequencies based on the local clock information after coding.
    4th, method as claimed in claim 1 or 2, it is characterised in that the local clock information includes master clock frequency, the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN, specifically included by the RRN：
    It is " literary that the absolute value of the master clock frequency is packaged into Frequency Synchronization by the RRN；
    The Frequency Synchronization message is sent to the offspring network nodes, to cause the offspring network nodes are based on the Frequency Synchronization message synchronous with the RRN keep frequencies.
    5th, method as claimed in claim 1 or 2, it is characterised in that the local clock information carried out after time synchronized is sent to the offspring network nodes of the RRN by the RRN, specifically includes：
    The local clock information is packaged into clock sync message by the RRN, wherein, the local clock information includes master clock frequency and fiducial time；
    The clock sync message is sent to the offspring network nodes, with cause the offspring network nodes be based on the clock sync message with the RRN keep frequencies synchronous and time synchronized. 6th, a kind of clock synchronization apparatus, it is characterised in that described device includes：
    Receiving unit, the time synchronization information for receiving BS transmissions；
    Time synchronized unit, for receiving the time synchronization information that the receiving unit is sent, according to the time synchronization information, carries out time synchronized by described device and the BS, obtains the local clock information carried out after time synchronized；
    Transmitting element, for receiving the local clock information that the time synchronized unit is sent, the local clock information is sent to the offspring network nodes of described device, so that the offspring network nodes keep clock synchronous based on the local clock information received with described device.
    7th, device as claimed in claim 6, it is characterised in that described device also includes coding unit, for before the transmitting element sends the local clock information, the local clock information is encoded, wherein, the local clock information includes master clock frequency；
    The transmitting element, specifically for the local clock information after coding is sent into the offspring network nodes, to cause the offspring network nodes synchronous with the RRN keep frequencies based on the local clock information after coding.
    8th, device as claimed in claim 6, it is characterised in that the local clock information includes master clock frequency, described device also includes frequency encapsulation unit；
    The frequency encapsulation unit, for before the transmitting element sends the local clock information, the absolute value of the master clock frequency to be packaged into Frequency Synchronization message；To cause the offspring network nodes are based on the Frequency Synchronization message synchronous with described device keep frequency.
    9th, device as claimed in claim 6, it is characterised in that described device also includes clock encapsulation unit；
    The clock encapsulation unit, for before the transmitting element sends the local clock information, the local clock information to be packaged into clock sync message, wherein, the local clock information includes master clock frequency and fiducial time；With cause the offspring network nodes be based on the clock sync message it is synchronous with described device keep frequency and Time synchronized.
    10th, a kind of relaying remote node R RN, it is characterised in that the RRN includes：
    Receiver, the lock in time information for receiving base station BS transmission；
    Processor, for according to the time synchronization information, the RRN and BS to be carried out into time synchronized, obtains the local clock information carried out after time synchronized；
    Transmitter, the offspring network nodes for the local clock information to be sent to the RRN, so that the offspring network nodes keep clock synchronous based on the local clock information received with the RRN.
CN201380003170.9A 2013-12-26 2013-12-26 Clock synchronization method, device, and eRelay remote node (RRN) Pending CN104982078A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102014479A (en) * 2009-12-31 2011-04-13 大唐移动通信设备有限公司 HeNB (Home eNodeB) synchronization method, system and device
CN102076024A (en) * 2009-11-24 2011-05-25 华为技术有限公司 Base station, network system and implementation method
CN103378916A (en) * 2012-04-19 2013-10-30 中兴通讯股份有限公司 Clock transmission method, boundary clock and transparent clock

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102076024A (en) * 2009-11-24 2011-05-25 华为技术有限公司 Base station, network system and implementation method
CN102014479A (en) * 2009-12-31 2011-04-13 大唐移动通信设备有限公司 HeNB (Home eNodeB) synchronization method, system and device
CN103378916A (en) * 2012-04-19 2013-10-30 中兴通讯股份有限公司 Clock transmission method, boundary clock and transparent clock

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