CN100479406C - Resource distributing method of bus system - Google Patents
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- CN100479406C CN100479406C CNB2006100929831A CN200610092983A CN100479406C CN 100479406 C CN100479406 C CN 100479406C CN B2006100929831 A CNB2006100929831 A CN B2006100929831A CN 200610092983 A CN200610092983 A CN 200610092983A CN 100479406 C CN100479406 C CN 100479406C
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Abstract
A method for distributing resource of bus system includes selecting one resource from available resources separately by all nodes and sending response message separately by all normal nodes, judging whether it is existed that nodes of the same resource are selected simultaneously or not by master node, finalizing resource distribution if it is not or otherwise reselecting one resource separately from available resource being not selected by nodes selected the same resource and sending response message separately then returning back to judging step.
Description
Technical field
The present invention relates to the bus communication technology, relate in particular to a kind of resource allocation methods of bus system.
Background technology
The notion of home network was just known by everybody before a lot of years, but up to now, did not also have the real product input scale based on home network of a cover to use.Main cause is also not have the physical layer protocol of the proper home network of a cover to be formulated.Simultaneously because the high speed development of mechanics of communication, audio/video encoding/decoding technology, the control that the notion of home network has been paid close attention to before being not only and the communication network of secure context, the simple communication network of high-speed video stream or access aspect, but a kind of omnibearing network system of fusion.
From application point of view, should have following characteristic: ease for use, compatibility, robustness as the one family network.From the mechanics of communication angle, should have following characteristics: be a bus system, the low rate code stream of burst is arranged, more long high-speeld code-flow is arranged as the one family network.
The circuit network that is deployed in household internal generally speaking is (as power line) as shown in Figure 1, is characterized in that the communication node number is many on the bus, and the topological structure more complicated has the data flow of the many speed of many grades.
OFDM (Orthogonal Frequency Division Multiplexing, the transmission signals of modulating system OFDM) is made of frame, and each frame comprises all band informations and has a fixing duration (duration is τ as shown in Figure 2).
Power line channel is compared with other some channels has some special characteristics, during especially as bus transfer.It is bigger etc. that its feature mainly contains the selectivity decline of frequency, apparent in view multipath effect, time-varying characteristics, circuit background noise.Channel with these characteristics requires receiver that channel is had more intense adaptive tracing ability in communication.As among Fig. 1 when A1 and C2 carry out communication, the signal that C2 receives has the signal that directly sends from A1, and the reflected signal from other different nodes is arranged, simultaneously because the position of node and number different, the time that these reflected signals arrive, strong and weak all different.Require to have reasonable time domain equalization and/or frequency domain compensation at receiving terminal.But the character rate of OFDM technology itself is lower, when using the Cyclic Prefix technology simultaneously, can loosen certain requirement aspect time domain equalization.
As shown in Figure 1, suppose when A1 and C2 when carrying out the communication of big data quantity, A2 needs and B1 carries out the communication of the smaller control information of some data volumes.
If use the method for time-division, will stop the communication of A1 and C2, carry out communication for A2 and B1 used Frequency Distribution.Because the feature of circuit will have been spent the long time and trained in A2 and B1 energy normal communication.When switching to A1 and C2 after A2 and B1 communication are finished, the parameter of physical layer that may be original has not too adapted to present condition.If it is many that the node of small data quantity communication is carried out in requirement,, make the node of big data quantity communication be subjected to bigger influence owing to will carry out frequent switching.
If use the method for frequency division, the physical link that just is necessary for each possibility communication distributes a frequency resource, has 121 links up and down as shown in Figure 1, must be divided into 121 parts to whole frequency band.The operating rate of each link can not be too high like this, simultaneously also more complicated when carrying out network design.
Can use multiple modulation technique to solve the function that in same bus system, transmits high-speed data and low speed data simultaneously.Sum up according to actual environment for use, data are at a high speed just torn chain in case set up after this link just needs to use the regular hour often as access, video flowing etc.And the control data of some low speed is to be used for transmitting some instant control informations (message), in case may will tear chain open after setting up such link at once.Based on this concrete condition, the message of transmitting low speed with the modulation system of OFDM is not too suitable, use QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) or PSK (Phase Shift Keying, phase shift keying) or FSK (Frequency Phase ShiftKeying, frequency shift keying) or the modulation system of simple and easy OFDM transmit these message, use the OFDM modulation system to transmit data-message at a high speed.
The simple and easy OFDM modulation system of explained later.Use the OFDM modulation technique as xDSL, because the decay and the The noise of each subcarrier, the bit number that each subcarrier can carry is different.Owing to wanting the high efficiency reason such as channel capacity of utilizing, in the xDSL standard, also defined a Fine Gain parameter, be used for adjusting the transmitted power of transmitter.So these parameters are receiving terminals by train, process such as study obtains.Receiving terminal must be delivered to transmitting terminal to these information, uses new parameter work simultaneously on an identical moment both sides then.Simply described the working method of OFDM modulation among the xDSL above, and simple and easy OFDM mode comprises exactly or all do not comprise: 1) each subcarrier uses fixing bit to load number, as 2 bits or 1 bit; 2) each subcarrier uses fixing power to send; 3) error correction codogram frame and OFDM intersymbol have significantly definite relation, or do not use any code means; 4) before normal communication without any need for the training of form.
As shown in Figure 2, the structure of Frame is that a synchronization frame adds N OFDM Frame.Wherein this N OFDM Frame is used for transmitting high speed data, and this synchronization frame is used for transmitting low speed data.
As shown in Figure 3, the low speed communication message uses the message of anchor-frame form, comprising:
The frame head of a byte length is used for representing the initial of message, is used in ofdm system representing that this frame is a synchronization frame simultaneously.
The destination address of b byte length is used for representing the object that this frame message sends.
The source address of c byte length is used for representing the sender of this frame message, if direct this address of answer just when this message requires to reply.
The control command of d byte is used for representing that the recipient is receiving the action of being done after this message.
The continuity instruction of e byte is used for representing also needing to send message in the next timeslice of sending node after sending this message.
The user definition data of f byte are to keep to give more user-defined private contents.
The check code of g byte.
As shown in Figure 4, the synchronization frame that occurs in succession uses for different sending nodes according to fixing (as offered) order assignment.Suppose to have 4 sending nodes, sending node 1 sends message at synchronization frame 1 time slot, and sending node 2 sends message at synchronization frame 2 time slots, and the like.
But be not that each sending node all has data to need to send in the moment of its regulation, when using the continuity instruction, this sending node shows, at next time slot is when not sending data, this sending node does not just send data in next one circulation, and the shared time slot of this sending node just can be used by other sending node.Also can show at following two time slots or other time slot not send data, these time slots be allowed out use to other sending node by continuity instruction.
When whole system was initialized, sequential cannot be determined.Therefore, need a kind of solution of when whole system is initialized, distributing the sequential of each sending node.
Summary of the invention
Main purpose of the present invention is to provide a kind of resource allocation methods of bus system, is used for being each node Resources allocation effectively in system initialisation phase.
To achieve these goals, the invention provides a kind of resource allocation methods of bus system.Bus system comprises host node and ordinary node, and resource allocation methods may further comprise the steps:
Step S102, all ordinary nodes select a resource respectively from available resources, all ordinary nodes send response message to host node respectively;
Step S104, host node judge whether to exist the ordinary node of selected same asset simultaneously, if there is no, then finish resource allocation, if exist, then proceed to step S106;
Step S106, the ordinary node of selected same asset is reselected a resource respectively in not chosen available resources, and sends response message respectively, is back to step S104.
Available resources can directly be kept in all nodes, also can send message to ordinary node by host node and be issued to each ordinary node.
The frequency domain of bus system can comprise following frequency range: first frequency group and second frequency group, host node use the frequency of first frequency group to send message, and ordinary node uses the frequency of second frequency group to send message.
Available resources by host node when ordinary node sends message and is issued to each ordinary node, host node can send message with FSK, PSK, QPSK or simple and easy OFDM modulation system.In step S106, ordinary node can send response message with FSK, PSK, QPSK or simple and easy OFDM modulation system.
The distribution of available resources and select can by use with resource one to one resource number realize.
Finish after the resource allocation, host node can be according to resource allocation conditions, and resource is renumberd and distributes, and to the new resource allocation table of all ordinary nodes distributions.In the resource allocation table, the numbering of the resource that each node was reallocated is corresponding one by one with its physical address.Resource is renumberd and the step of distributing can comprise and available resources are renumberd according to the sum of node and distributes.
Above-mentioned resource can be any in time slot, spreading code and the frequency.
Before the step S102, can determine host node by following steps:
Step S202, each node in bus system detection line signal in greater than a period of time of the scheduled time if node does not detect the signal of first frequency group, then proceeds to step S204, if node detection then proceeds to step S208 to the signal of first frequency group;
Step S204, node send the signal of first frequency group in one section random time;
Step S206, node detection line signal in the scheduled time after stopping to send signal if detect the signal of first frequency group, then proceeds to step S208, if do not detect the signal of first frequency group, then proceeds to step S212;
Step S208, node do not send signal, and are confirmed as non-host node;
Step S210, be confirmed as the node detection line signal in outside the non-host node in the bus system greater than a period of time of the scheduled time, if node does not detect the signal of first frequency group, then proceed to step S204, if node detection then proceeds to step S208 to the signal of first frequency group;
Step S212, node continue to send signal, and are confirmed as host node.
Step S204 can comprise: node produces random number, and the enabling counting device, sends signal simultaneously, when rolling counters forward equates with random number, stops to send signal.
In the step of determining host node, detect and send signal and all be limited in the first frequency group.
Pass through technique scheme, the present invention numbers and allocation table to all node distributed resources by host node, realized effective distribution of system resource, also, determined the host node of system by all nodes being detected according to certain strategy and sending signal.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the circuit of home network;
Fig. 2 is the schematic diagram of data frame structure in the bus system;
Fig. 3 is the structure chart that transmits the anchor-frame of low speed data in the bus system;
Fig. 4 is the distribution schematic diagram of synchronization frame in the bus system;
Fig. 5 is the flow chart according to bus system resource allocation methods of the present invention;
Fig. 6 is the flow chart according to the step of definite host node of the present invention;
Fig. 7 is the frequency space grouping schematic diagram according to the embodiment of the invention;
Fig. 8 is the flow chart according to definite host node of the embodiment of the invention;
Fig. 9 is the schematic diagram according to the response message of the embodiment of the invention;
Figure 10 is the schematic diagram according to the time slot allocation example of the embodiment of the invention; And
Figure 11 is a schematic diagram of redistributing example according to the time slot of the embodiment of the invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
With reference to figure 5, may further comprise the steps according to the resource allocation methods of bus system of the present invention:
Step S102, all nodes select a resource respectively from available resources, all ordinary nodes send response message respectively;
Step S104, host node judge whether to exist the node of selected same asset simultaneously, if there is no, then finish resource allocation, if exist, then proceed to step S106;
Step S106, the node of selected same asset is reselected a resource respectively in not chosen available resources, and sends response message respectively, is back to step S104.
Finish after the resource allocation, host node can be according to resource allocation conditions, and resource is renumberd and distributes, and to the new resource allocation table of all ordinary nodes distributions.In the resource allocation table, the numbering of the resource that each node was reallocated is corresponding one by one with its physical address.Resource is renumberd and the step of distributing can comprise and available resources are renumberd according to the sum of node and distributes.
With reference to figure 6, as follows according to the step of definite host node of the present invention:
Step S202, each node in bus system detection line signal in greater than a period of time of the scheduled time if node does not detect the signal of first frequency group, then proceeds to step S204, if node detection then proceeds to step S208 to the signal of first frequency group;
Step S204, node send the signal of first frequency group in one section random time;
Step S206, node detection line signal in the scheduled time after stopping to send signal if detect the signal of first frequency group, then proceeds to step S208, if do not detect the signal of first frequency group, then proceeds to step S212;
Step S208, node do not send signal, and are confirmed as non-host node;
Step S210, be confirmed as the node detection line signal in outside the non-host node in the bus system greater than a period of time of the scheduled time, if node does not detect the signal of first frequency group, then proceed to step S204, if node detection then proceeds to step S208 to the signal of first frequency group;
Step S212, node continue to send signal, and are confirmed as host node.
The present invention mainly solves the problem of resource such as sequential of how to distribute each sending node in system initialization.
The job step of all nodes is described below when system shown in Figure 1 powers on.
At initial phase, in whole frequency space, the staggered two kinds of frequency ranges (as shown in Figure 7) of telling.Initialization procedure is as follows:
The first step: determine host node (with reference to figure 8).
1, finishes the self check of this machine.
2, one section random time of detection line signal greater than t1.
If 3 do not have the signal of group of frequencies 1 all the time, then the signal of transmission frequency group 1 immediately produces a random number simultaneously, and starts a counter.
4, when rolling counters forward equates with random number, stop to send the signal regular hour (t1), and whether detection line there is the signal of group of frequencies 1.
If 5 do not have the signal of group of frequencies 1 at t1 in the time, then continue the signal of transmission frequency group 1, this node is confirmed as host node, determines that the step of host node finishes.
If 6 detect the signal of group of frequencies 1 in 2, then do not send signal, this node is confirmed as non-host node.
If 7 detect the signal of group of frequencies 1 in 4, then do not send signal, this node is confirmed as non-host node.
The present invention calls " host node " to the communication node that proceeds to 5.
Second step: the determining of time slot.
Host node at first sends the message that starts the distribution time slot by FSK modulation systems such as (or PSK or QPSK etc.) and frequency of utilization group 1, and gives the scope of output time slot sequence number.As 2-100, wherein No. 1 time slot is distributed to this host node automatically.After other node receives this message, just in regulation time slot serial number range, select a time slot sequence number at random.
After host node sends distribution slotted messages regular hour (t), require to choose the node of 2,3,4 to No. 100 time slots to send response message successively.The content that this response message comprises as shown in Figure 9, wherein message header represents that this message is to send replying of message to requiring, and has uniqueness.Timeslot number is illustrated in the previous step selected at random timeslot number, when host node requires the timeslot number that sends identical with the timeslot number of selecting, could send this message.Source physical address represents to send the physical address of the node of signal.Check code can be used for checking the mistake that produces in transmission course.
When if certain node finds that the timeslot number of host node requirement transmission is identical with the timeslot number of itself selecting, just use FSK modulation systems such as (or PSK or QPSK) and frequency of utilization group 2 to send message shown in Figure 9.
If have only a node to choose certain timeslot number, have only a node sending signal constantly at this so, other all nodes are this message of demodulation correctly.Host node is preserved corresponding timeslot number and corresponding source physical address.
If being arranged, two or more nodes choose same timeslot number, just there are a plurality of nodes sending signal at synchronization so, because the interference between signal, other node comprise correctly demodulation message of host node, it is unsuccessful that host node is notified this timeslot number distribution like this.
If first circulates, also have node not have the correct time slot that is assigned to, just require not to be assigned to node selected at random again and process above the repetition in remaining time slot of time slot, all be assigned to a unique time slot until each node.
The 3rd step: time slot is redistributed
May do not used by node by some time slot by being assigned of second step, host node is carried out time slot and is redistributed according to the distribution condition of reality like this.And distribution time slot table.
Suppose to have in the network 10 communication nodes, distributable timeslot number is 100, may be as shown in figure 10 situation through being assigned of second step so.
Can be divided into 10 time slots as the case may be, redistribute as shown in figure 11.When host node this time slot allocation table the time, owing to known the physical address (because uniqueness of physical address) of all nodes, only needs corresponding which time slot of which physical address of definition just passable in distribution.The mode that this message can be broadcasted sends.After other node is received this message, find the pairing time slot of physical address of itself just passable.
The present invention has provided a kind of bus communication method of many communication nodes, makes system produce interim host node on bus, and determines the sending node time slot on bus.
Although it should be noted that the present invention the home bus communication system is described as an example, clearly, the present invention is not limited thereto, and the present invention is applicable to and anyly need carries out initialized bus system when no host node.In addition, although the present invention is described time slot allocation as an example, clearly, the present invention is not limited thereto, and the present invention is applicable to that any needs carry out the bus system that resource (including but not limited to time slot, spreading code and frequency) is distributed.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the resource allocation methods of a bus system is characterized in that, described bus system comprises host node and ordinary node, and described resource allocation methods may further comprise the steps:
Step S102, all described ordinary nodes select a resource respectively from available resources, all described ordinary nodes send response message to described host node respectively;
Step S104, described host node judge whether to exist the described ordinary node of selected same asset simultaneously, if there is no, then finish resource allocation, if exist, then proceed to step S106;
Step S106, the described ordinary node of selected same asset is reselected a resource respectively in not chosen available resources, and sends response message respectively, is back to step S104;
Wherein, before described step S102, also comprise the step of determining described host node.
2. resource allocation methods according to claim 1 is characterized in that, described available resources directly are kept in all nodes, and perhaps described available resources send message by described host node to described ordinary node and are issued to each ordinary node.
3. resource allocation methods according to claim 2, it is characterized in that, the frequency domain of described bus system comprises following frequency range: first frequency group and second frequency group, described host node uses the frequency of first frequency group to send message, and described ordinary node uses the frequency of second frequency group to send message.
4. resource allocation methods according to claim 2, it is characterized in that, described available resources by described host node when described ordinary node sends message and is issued to each ordinary node, described host node sends message with frequency shift keying, phase shift keying, Quadrature Phase Shift Keying or simple and easy OFDM modulation system.
5. resource allocation methods according to claim 1 is characterized in that, in step S106, described ordinary node sends response message with frequency shift keying, phase shift keying, Quadrature Phase Shift Keying or simple and easy OFDM modulation system.
6. resource allocation methods according to claim 1 is characterized in that, the distribution of described available resources and select by use with resource one to one resource number realize.
7. resource allocation methods according to claim 1 is characterized in that, finishes after the resource allocation, and described host node is according to resource allocation conditions, resource is renumberd and distributes, and to the new resource allocation table of all ordinary nodes distributions.
8. resource allocation methods according to claim 7 is characterized in that, described resource is renumberd and the step of distributing comprises and available resources are renumberd according to the sum of node and distributes.
9. resource allocation methods according to claim 7 is characterized in that, in the described resource allocation table, the numbering of the resource that each node was reallocated is corresponding one by one with its physical address.
10. according to each described resource allocation methods in the claim 1 to 9, it is characterized in that described resource is any in time slot, spreading code and the frequency.
11. resource allocation methods according to claim 10 is characterized in that, before the step S102, determines described host node by following steps:
Step S202, each node in described bus system detection line signal in greater than a period of time of the scheduled time if node does not detect the signal of first frequency group, then proceeds to step S204, if node detection then proceeds to step S208 to the signal of first frequency group;
Step S204, described node send the signal of first frequency group in one section random time;
Step S206, described node detection line signal in the described scheduled time after stopping to send the signal of described first frequency group if detect the signal of first frequency group, then proceeds to step S208, if do not detect the signal of first frequency group, then proceed to step S212;
Step S208, described node does not send the signal of described first frequency group, and is confirmed as non-host node;
Step S210, be confirmed as the node detection line signal in outside the non-host node in the described bus system greater than a period of time of the scheduled time, if node does not detect the signal of first frequency group, then proceed to step S204, if node detection then proceeds to step S208 to the signal of first frequency group;
Step S212, described node continues to send the signal of described first frequency group, and is confirmed as host node.
12. resource allocation methods according to claim 11, it is characterized in that, step S204 comprises: described node produces random number, and enabling counting device, send the signal of first frequency group simultaneously, when described rolling counters forward equates with described random number, stop to send the signal of described first frequency group.
13. according to claim 11 or 12 described resource allocation methods, it is characterized in that, the frequency domain of described bus system comprises following frequency range: first frequency group and second frequency group, in the step of described definite described host node, detect and send signal and all be limited in the described first frequency group.
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| CN103354507B (en) * | 2013-07-08 | 2016-09-28 | 杭州华三通信技术有限公司 | The configuration protection schema update method and apparatus of RPR website |
| CN113938161B (en) * | 2020-06-29 | 2022-12-06 | 华为技术有限公司 | Power line communication PLC method and device |
| CN115348132B (en) * | 2022-08-12 | 2023-10-13 | 中国联合网络通信集团有限公司 | Data transmission method, equipment node, industrial intelligent bus and system |
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