CN101286797A - Timing signal transmitting method and system based on OBSAI protocol - Google Patents
Timing signal transmitting method and system based on OBSAI protocol Download PDFInfo
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- CN101286797A CN101286797A CNA2008100978521A CN200810097852A CN101286797A CN 101286797 A CN101286797 A CN 101286797A CN A2008100978521 A CNA2008100978521 A CN A2008100978521A CN 200810097852 A CN200810097852 A CN 200810097852A CN 101286797 A CN101286797 A CN 101286797A
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Abstract
The invention discloses a timing signal transmission method which has high reliability and simple realization based on an OBSAI protocol, and a system thereof. The main technical proposal of the method includes that: 1. a standard tick is respectively constructed in each sub-node, wherein, the phase position of the standard pulse of the sub-node adjacent to a master node should correspond to the phase position of the standard pulse of an adjacent upstream node; 2. the advanced timing signal pulse of a master node broadcasts a timing signal indication message to each sub-node in a span; 3. after receiving the timing signal indication message, each sub-node respectively generates the timing signal of the node in the next pulse time of the standard tick. The invention can be taken as a substitute for the self-contained timing signal transmission proposal of the OBSAI protocol.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to timing signal transmission method and system based on the OBSAI agreement.
Technical background
The conduct of OBSAI (Open Base Station Architecture promoter's tissue) agreement is one of widely used base band radio frequency interface standard in the world, and the timing signal transmission between the base band radio frequency interface is had the detailed flow process of a cover, is described below.
The OBSAI protocol definition a kind of frame structure of special use, frame length 10ms separates by a specific code (K sign indicating number) between frame and the frame.For convenience, OBSAI has defined signal a: Tick again, and its high impulse is corresponding fully with frame boundaries, and width just equals the width of frame boundaries, and the cycle also is 10ms, and the relation between them is seen accompanying drawing 1.For two nodes that use OBSAI to connect, the data code flow between them all transmits with this form of Fig. 1, and in a single day frame boundaries and tick produce, and just keep always; Same tick transmits between sending and receiving, as long as fiber lengths is constant, time-delay between transmission tick and the reception Tick is with regard to basic fixed, deduct this time-delay, can think that they are signals, so tick has just become only common reference signal between adjacent two nodes, OBSAI just utilizes it to realize the transmission of timing signal.
The OBSAI agreement is transmitted the process of timing signal and is seen accompanying drawing 2.It is bridge with Tick, transmits timing signal by a special message (message).Time-delay T1 between at first host node is measured from Tick to the timing signal, then it is inserted in the special message, pass to from node, after receiving this message from node, Tick with appointment is a benchmark, with the time parameter in the message is foundation, the influence of deduction tick transmission delay T2, the timing signal of regenerating.
Because Tick is the 10ms one-period, and timing signal 1 second one-period normally, so it is just passable to choose the benchmark as timing signal for generating from node among 100 Tick, this function also is to be finished by particular message mentioned above.A System Frame Number (SFN, System FrameNumber) is arranged in this message, and SFN just is used to refer to which frame boundaries of beginning from this message is the benchmark as timing signal regeneration.
The method of this as can be seen transmission timing signal depends on the phase relation between particular message and the reception tick from top description, has only this phase relation to determine, could correctly indicate the benchmark tick that produces timing signal.But the transmission delay of the transmission delay of tick and message is different, so even we know the phase relation of making a start between tick and the message, but through after the transmission of several sections links, phase relation between message and the receiving end tick will change a lot, at this moment rethinking and finding the tick of appointment according to SFN is a very thing of difficulty, a critical defect of this method that Here it is.In addition, when cascade network, in order to keep the absolute stability of OBSAI link, the tick of each section link should be separate, but the phase relation that the timing signal transmission method that the OBSAI agreement is recommended but requires the tick of each section link to be maintained fixed, this will bring very big test to link stable.
Summary of the invention
At the defective that exists in the prior art, the timing signal transmission method based on the OBSAI agreement that the technical problem to be solved in the present invention provides a kind of reliability height, is easy to realize, the present invention also provides a kind of simple and reliable timing signal transmission system based on the OBSAI agreement for this reason.
For solving the problems of the technologies described above, the timing signal transmission method that the present invention is based on the OBSAI agreement comprises:
A, from node, make up a standard tick respectively at each, the phase place of wherein adjacent with the host node standard tick pulse from node should be consistent with the phase place of the timing signal pulse of host node as far as possible, and the phase place from the standard tick pulse of node is consistent as far as possible from upstream that the phase place of the standard tick pulse of node should be adjacent for all the other;
B, leading timing signal pulse a period of time of host node, from timing signal Indication message of node broadcasts, this leading time should guarantee that each all can receive this timing signal Indication message from node before the timing signal pulse of host node to each; This leading time should be less than the cycle of tick pulse, to guarantee which standard tick pulse correspondence this timing signal Indication message can accurately indicate and timing signal simultaneously;
C, after each receives described timing signal Indication message from node, the next pulse of each comfortable its described standard tick produces the timing signal of this node constantly.
Steps A is described carries out the phase place adjustment to each reception tick from node and with the method that makes up standard tick is: measure the internal delay time of upstream node and transmit time-delay; Phase place with the reception tick pulse of downstream node is a benchmark, and it is shifted to an earlier date the phase place of described two time-delay sums as the standard tick pulse of this downstream node, thereby produces the standard tick of this downstream node; If upstream node is a host node, then described internal delay time is that the time-delay between its transmission tick pulse is arrived in the timing signal pulse on this upstream node; If upstream node is from node, to be this send time-delay the tick pulse from the standard tick pulse of node to it to then described internal delay time; The transmission time-delay of described upstream node is that the time-delay between the reception tick pulse of downstream node, just timing signal needed time of unidirectional delivery between two nodes are arrived in the transmission tick pulse of this upstream node.
The internal delay time of described upstream node and transmission delay data can pass to downstream node by signalling path, also can pass to downstream node by the control channel that OBSAI carries.
The described leading time of step B can be 5ms.
For solving the problems of the technologies described above, the timing signal transmission system that the present invention is based on the OBSAI agreement comprises host node and from node, described host node be used for before the timing signal pulse timing signal Indication message of broadcasting to each from node; Describedly be used for making up a standard tick at this node from node, the phase place of wherein adjacent with the host node standard tick pulse from node should be consistent as far as possible with the phase place of the timing signal pulse of host node, and all the other phase places from the standard tick pulse of node should be adjacent the phase place unanimity as far as possible of the standard tick pulse of upstream node; Describedly also be used for after receiving described timing signal Indication message, produce a timing signal at the next pulse place of its described standard tick, as this timing signal from node from node.
Each upstream node that comprises host node also is used to measure the internal delay time of this node and transmit time-delay, and these two delay datas are passed to adjacent downstream node; If upstream node is a host node, then described internal delay time is that the time-delay between its transmission tick pulse is arrived in the timing signal pulse on this upstream node; If upstream node is from node, to be this send time-delay the tick pulse from the standard tick pulse of node to it to then described internal delay time; The transmission time-delay of described upstream node is that the time-delay between the reception tick pulse of downstream node, just timing signal needed time of unidirectional delivery between two nodes are arrived in the transmission tick pulse of this upstream node.Described from node when being used to make up described standard tick, the scheme of employing is: with its phase place that receives the tick pulse is benchmark, and it is shifted to an earlier date the phase places of described two time-delay sums as the standard tick pulse of this node.
Described upstream node can be to transmit by signalling path when described internal delay time is passed to downstream node with the transmission delay data, also can be to transmit by the control channel that OBSAI carries.
For host node and a timing signal transmission system of forming from node, described host node comprises: the Indication message generation module is used to produce the timing signal Indication message; The Indication message delivery module is used for described timing signal Indication message is passed to each from node; The internal delay time measurement module is used to measure the timing signal pulse to the time-delay that sends between the tick pulse; Fiber delay time measurement module, the transmission tick pulse that is used to measure host node be to from the time-delay between the reception tick pulse of node, promptly above-mentioned transmission time-delay; Data transmission blocks is used for described two delay datas are passed to from node.
Describedly comprise from node: the Indication message receiver module is used to receive described timing signal Indication message, and produces an index signal notice timing signal regeneration module when receiving this message; Data reception module is used to receive described two delay datas; Standard tick generation module, the phase place that is used for its reception tick pulse is a benchmark, and it is shifted to an earlier date the phase place of described two time-delay sums as standard tick pulse, thus the standard of generation tick; The timing signal regeneration module is used for after receiving the index signal that the Indication message receiver module is sent, and produces the timing signal from node at the next pulse place of described standard tick.
In the inventive method/system, because the generation of timing signal does not rely on the phase relation between timing signal Indication message and tick, only require from node and before the timing signal pulse of host node, can receive this Indication message, therefore simplified logical design greatly.In addition, mainly come from the measurement of two time-delays from the phase error of the timing signal of the timing signal of node regeneration and host node, the error that fiber delay time is measured can be controlled within several clock cycle, and timing signal/standard tick is to finish in a slice logic to sending the measurement of delaying time between tick, error can be littler, total error generally is no more than 10 sampling clock cycles, thereby precision of the present invention and reliability are higher.
Description of drawings
Fig. 1 is the Tick signal in the OBSAI agreement and the phase diagram of frame boundaries;
Fig. 2 is the timing signal transmission method schematic diagram in the OBSAI agreement;
Fig. 3 is a binode network timing signal transduction system schematic diagram of the present invention;
Fig. 4 is the timing signal transmission method schematic diagram in the binode network;
Fig. 5 is the present invention's three meshed network timing signal transmission system schematic diagrames.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 3 is a binode network timing signal transduction system schematic diagram, as shown in the figure, this timing signal transmission system comprises a host node 301 and one from node 302, and wherein host node comprises: Indication message generation module 303 is used to produce a timing signal Indication message; Indication message sending module 304 is used to send the timing signal Indication message; Internal delay time measurement module 307 is used for the timing signal pulse to sending the measurement of delaying time between the tick pulse; Fiber delay time measurement module 311 is used for host node to the measurement from signal one-way transmission time-delay between the node; Data transmission blocks 308 is used for described two delay datas are sent to from node.Comprise from node: Indication message receiver module 305 is used to finish the reception of timing signal Indication message and produces index signal; Timing signal regeneration module 306 is used for according to described index signal and timing signal of standard tick regeneration; Data reception module 309 is used for extracting described two delay datas that host node is sent here from data link; Standard tick generation module 310, being used for to receive tick is benchmark, according to two delay datas receiving, produces standard tick.
Fig. 4 is a timing signal transmittance process schematic diagram in the binode network, and as shown in the figure, in host node 301, the timing signal pulse is T1 to the time-delay that sends between the tick pulse; Process transmits the reception tick pulse of time-delay T2 generation from node after the transmission tick of host node pulse, after fiber lengths is fixing, this transmits time-delay also is basic fixed, so from node 302, just can receive the phase place of tick pulse as benchmark, leading T2 just and send the phase alignment of tick pulse, leading again T1 is just and the phase alignment of timing signal pulse.Therefore be exactly to be benchmark from the standard tick of node 302 with its phase place that receives the tick pulse, the phase place of the time of leading T1+T2 as standard tick pulse obtains, and the phase place of this standard tick pulse is alignd with the phase place of the timing signal pulse of host node 301.
The cycle of standard tick is 10ms, and the cycle of timing signal generally is 1 second, produces a timing signal so also will find out one in 100 tick pulses, and this work is finished by the timing signal Indication message.
Host node produces the timing signal Indication message for the previous period in each timing signal pulse, gives all from node this information broadcast then.In advance a period of time is in order to guarantee that each all can receive it from node before the timing signal pulse, so what shift to an earlier date should reach each maximum from the used duration of node greater than Indication message during this period of time, it also is less than the cycle 10ms of tick pulse simultaneously, otherwise which pulse correspondence that just can not accurately indicate standard tick timing signal, usually we to get this time be 5ms, so just can satisfy top two requirements.
Fig. 5 is three meshed network timing signal transmission system schematic diagrames, this system comprises host node 501, first from node 502, second from node 503, wherein the software architecture of host node 501 is identical with the host node of binode timing signal transmission system shown in Figure 3, and the set of its correlation module is represented with 504; First is also identical with regeneration timing signal correlation module the binode shown in Figure 3 system from the correlation module of node 502 the insides regeneration timing signal, and the set of this correlation module is represented with 505; Except regeneration timing signal correlation module 505, first has also increased by one from node 502 overlaps the supplementary module that transmits timing signal, comprise: internal delay time measurement module 507, be used for to first from node 502 standard tick pulses to sending the measurement of delaying time the tick pulse; Fiber delay time measurement module 511 is used for first measurement from transmission delay the node 503 from node 502 to second; Data transmission blocks 508 is used for described two delay datas are sent to second from node 503.Second identical from node 302 from the software architecture of node 503 and binode network timing signal transduction system shown in Figure 3 all is to receive data and the message that upstream node transmits, and then bears a timing signal.Second be reference with first from node 502 from the timing signal of node 503 just, its target is and first phase alignment from the timing signal of node 502 herein.The timing signal Indication message of whole network all is to be produced and sent by host node, and each can only receive and transmit from node.
For host node and a plurality of cascade network network of forming from node, the transmission of timing signal is identical with the timing signal transfer principle of three meshed networks shown in Figure 5, more than only some intermediate nodes.
In a word, the present invention has proposed a kind of frame boundaries based on the OBSAI agreement and has realized the method/system that timing signal transmits in moving communicating field, this method/system is simple and reliable, be easy to realize, overcome the shortcoming of transmitting the timing signal method in the OBSAI agreement, improved reliability and precision that timing signal transmits greatly.
In the mode of specific embodiment the present invention has been done detailed explanation above; should be understood that simultaneously; the present invention's scope of asking for protection is illustrated in the appended claims; and can not be with the foregoing description of specification as restriction, every conspicuous modification within aim of the present invention is also due within protection scope of the present invention.
Claims (10)
1, a kind of timing signal transmission method of organizing agreement based on the Open Base Station Architecture promoter is characterized in that comprising:
A, from node, make up a standard tick respectively at each, the phase place of wherein adjacent with the host node standard tick pulse from node should be consistent with the phase place of the timing signal pulse of host node as far as possible, and the phase place from the standard tick pulse of node is consistent as far as possible from upstream that the phase place of the standard tick pulse of node should be adjacent for all the other;
B, leading timing signal pulse a period of time of host node to each from timing signal Indication message of node broadcasts, this leading time should guarantee that each all can receive this timing signal Indication message from node before the timing signal pulse of host node, and this leading time should be less than the cycle of tick pulse simultaneously;
C, after each receives described timing signal Indication message from node, the next pulse of each comfortable its described standard tick produces the timing signal of this node constantly.
2, the timing signal transmission method of organizing agreement based on the Open Base Station Architecture promoter according to claim 1 is characterized in that the method for the described structure standard of steps A tick is: measure the internal delay time of upstream node and transmit time-delay; Phase place with the reception tick pulse of downstream node is a benchmark, and it is shifted to an earlier date the phase places of described two time-delay sums as the standard tick pulse of this downstream node;
If upstream node is a host node, then described internal delay time is that the time-delay between its transmission tick pulse is arrived in the timing signal pulse on the host node; If upstream node is from node, to be this send time-delay the tick pulse from the standard tick pulse of node to it to then described internal delay time; The transmission time-delay of described upstream node is that the time-delay between the reception tick pulse of downstream node, just signal needed time of unidirectional delivery between two nodes are arrived in the transmission tick pulse of this upstream node.
3, the timing signal transmission method of organizing agreement based on the Open Base Station Architecture promoter according to claim 2 is characterized in that: the internal delay time data of described upstream node and transmission delay data pass to downstream node by signalling path.
4, the timing signal transmission method of organizing agreement based on the Open Base Station Architecture promoter according to claim 2 is characterized in that: the internal delay time data of described upstream node and transmission delay data are to pass to downstream node by the control channel that the Open Base Station Architecture promoter organizes agreement to carry.
5, according to each described timing signal transmission method of organizing agreement based on the Open Base Station Architecture promoter in the claim 1 to 4, it is characterized in that: the described leading time of step B is 5ms.
6, a kind ofly organize the timing signal transmission system of agreement, comprise host node and, it is characterized in that from node based on the Open Base Station Architecture promoter:
Described host node is used for broadcasting a timing signal Indication message and arrives each from node before the timing signal pulse;
Describedly be used for making up a standard tick at this node from node, the phase place of wherein adjacent with the host node standard tick pulse from node should be consistent as far as possible with the phase place of the timing signal pulse of host node, and all the other phase places from the standard tick pulse of node should be adjacent the phase place unanimity as far as possible of the standard tick pulse of upstream node;
Describedly also be used for after receiving described timing signal Indication message, producing the timing signal of this node at the next pulse place of its described standard tick from node.
7, the timing signal transmission system of organizing agreement based on the Open Base Station Architecture promoter according to claim 6 is characterized in that:
Each upstream node that comprises host node also is used to measure the internal delay time of this node and transmit time-delay, and these two delay datas are passed to adjacent downstream node; If upstream node is a host node, then described internal delay time is that the time-delay between its transmission tick pulse is arrived in the timing signal pulse on this upstream node; If upstream node is from node, to be this send time-delay the tick pulse from the standard tick pulse of node to it to then described internal delay time; The transmission time-delay of described upstream node is that the time-delay between the reception tick pulse of downstream node is arrived in the transmission tick pulse of this upstream node;
Described from node when being used to make up described standard tick, the scheme of employing is: with its phase place that receives the tick pulse is benchmark, and it is shifted to an earlier date the phase places of described two time-delay sums as the standard tick pulse of this node.
8, the timing signal transmission system of organizing agreement based on the Open Base Station Architecture promoter according to claim 7 is characterized in that: described upstream node is by signalling path described two delay datas to be passed to its adjacent downstream node.
9, the timing signal transmission system of organizing agreement based on the Open Base Station Architecture promoter according to claim 7 is characterized in that: described upstream node is by the control channel that the Open Base Station Architecture promoter organizes agreement to carry described two delay datas to be passed to its adjacent downstream node.
10, according to each described timing signal transmission system of organizing agreement based on the Open Base Station Architecture promoter in the claim 6 to 9, it is characterized in that:
Described only have one from node;
Described host node comprises: the Indication message generation module is used to produce the timing signal Indication message; The Indication message delivery module is used for described timing signal Indication message is passed to each from node; The internal delay time measurement module is used to measure the timing signal pulse to the time-delay that sends between the tick pulse; The fiber delay time measurement module, the transmission tick pulse that is used to measure host node is to from the time-delay between the reception tick pulse of node; Data transmission blocks is used for described two delay datas are passed to from node;
Describedly comprise from node: the Indication message receiver module is used to receive described timing signal Indication message, and produces an index signal notice timing signal regeneration module when receiving this message; Data reception module is used to receive described two delay datas; Standard tick generation module, the phase place that is used for its reception tick pulse is a benchmark, and it is shifted to an earlier date the phase place of described two time-delay sums as standard tick pulse, thus the standard of generation tick; The timing signal regeneration module is used for after receiving the index signal that the Indication message receiver module is sent, and produces the timing signal from node at the next pulse place of described standard tick.
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Cited By (1)
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| CN107820312A (en) * | 2016-09-14 | 2018-03-20 | 凯瑟林-沃克两合公司 | Control system |
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| JP4213132B2 (en) * | 2005-03-28 | 2009-01-21 | 富士通マイクロエレクトロニクス株式会社 | Timing recovery circuit and thinning clock generation method |
| CN101119157B (en) * | 2007-09-18 | 2011-09-21 | 中兴通讯股份有限公司 | Method and system for measuring optical fibre time delay |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107820312A (en) * | 2016-09-14 | 2018-03-20 | 凯瑟林-沃克两合公司 | Control system |
| CN107820312B (en) * | 2016-09-14 | 2021-10-01 | 凯仕林欧洲股份有限公司 | Control system |
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Effective date of registration: 20180726 Address after: California, USA Patentee after: Global innovation polymerization LLC Address before: 518057 Nanshan District high tech Industrial Park, Shenzhen, Guangdong, Ministry of justice, Zhongxing Road, South China road. Patentee before: ZTE Corp. |
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Granted publication date: 20111228 |