CN101035358A - Method and system for channel switching in the radio communication system - Google Patents
Method and system for channel switching in the radio communication system Download PDFInfo
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Abstract
The present invention relates to a method and system for impliementing channel switch in wireless communications system. The implement includes that: first, it can inspect disturbing parameter information of each channel in wireless communications system; after that, according to the disturbing parameter information, the channel which fit scheduled condition of channel switch is confirmed, it can regard the channel switch as work channel. The invention can minish the effect of communication process. Thus, the frequent opration of channel switch is avoided.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of technology that reduces the Communication Jamming influence in the wireless communication system.
Background technology
In wireless communication system, the communication of carrying out between the communication equipment all need be carried out on specific channel.And, need corresponding cost owing to change working channel, therefore, after having selected the corresponding work channel, change that usually can be not frequent.
In communication system, communication process of every initiation just needs to take a channel, and, for avoiding inter-signal interference, guaranteeing that different signals can be distinguished easily, common two communication processs that carry out simultaneously can not take identical channel.Therefore, in other radio wave enters into the employed range of channels of communication process, just become corresponding interference.When interference ratio is less, can resist interference by the error correcting capability of system, if but interference ratio is bigger, will influence the communication between the equipment.Disturb for reducing, then require communicating pair should select a less channel of interference ratio to communicate.But communication environment changes at any time, disturbs also to become in time, for the less channel of former interference ratio, may can increase to the degree that has a strong impact on proper communication through interference after a while.
Based on the real-time variable feature of channel, be subjected to the influence of comparison serious disturbance as if the communication process between two equipment, then can select a new channel to rebulid communication process.
In the middle of present PAN (individual domain network) communication mechanism, the common employed working channel of each network, after setting up, network will no longer change, at this moment, produce if having to disturb, will cause the undesired of data transmission, for solving the problem that causes of disturbing, only rebulid network and could select a working channel that new interference is little, this must cause realizing accordingly that cost is higher.In addition, for PAN, since not only different in the interference of different time channels, also can be subjected to different interference for different nodes simultaneously, and therefore corresponding channel switching process is comparatively complicated.
For addressing the above problem, adopted at present by network coordinator control cycle ground the network work channel has been carried out the switching processing mode, described one-period is meant that all possible channel all successively as crossing working channel, switches to the handoff procedure of new channel again again; Wherein, described network coordinator be can supervising the network in the equipment of all nodes.In switching cycle, comprise the operation that working channel switch decision, working channel are selected, notified and switch.
Be specially: the cycle at first, produce the sequence of a switching channels in advance.Node in the middle of the PAN has judged whether monkey chatter or road interference altogether according to received signal in the middle of work, if monkey chatter or road interference are altogether arranged, then select next channel in the switching channels sequence as new working channel, other node in the new working channel informing network that will select simultaneously, other node also carries out the switching of working channel, provide simultaneously and reply, the node of notice switching at first receives all replying and then finishes handover operation one time, otherwise retransmits handoff request.Each like this next channel of selecting sequence central that switches was all selected up to all channels, just began new switching cycle.
From foregoing description as can be seen, because the channel sequence of switching is previously selected, rather than judges the channel that switch to according to real-time channel disturbance situation,, cause can switching once more again very soon so switch to poor channel through regular meeting.And the interstitial content possibility in PAN is many, all will carry out secondary channel switching if each node produces to disturb, and then the channel switching will be too frequent.In addition, different nodes has different interference, is not having the situation of united and coordinating, handle the average interference situation of whole PAN, oneself judge whether to switch by each node, then may whole network most time all be operated under the noisy channel, be unfavorable for the optimization of overall performance.
Summary of the invention
The purpose of this invention is to provide a kind of method and system that channel switches that in wireless communication system, realize, thereby can't select the problem of corresponding work channel in the solution communication network according to real-time disturbed condition, make it possible to choose only working channel by less channel handover operation number of times.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of method that channel switches that in wireless communication system, realizes, comprising:
A, in wireless communication system, detect the interference parameter information of each channel;
B, determine to meet the channel of predetermined channel switching condition, and carry out the channel hand-off process, described channel is switched as working channel according to described interference parameter information.
Described steps A comprises:
A1, when setting up wireless communication system, by each channel of each node scan in network coordinator and the network, detect to determine the interference parameter information of each channel correspondence, and preserve.
Described steps A comprises:
A2, in communication process, each channel in the system is carried out Interference Detection and determines the interference parameter information of each channel correspondence;
The interference parameter information of each channel correspondence that A3, basis are determined is upgraded the interference parameter information of each channel of preservation.
Described steps A 2 comprises:
When taking place to carry out the incident of Interference Detection or arrive predetermined interference detection time, then node triggers automatically or carries out channel disturbance by network coordinator notice node and detect, and determines the interference parameter information of each channel correspondence.
In steps A 2, described triggering node comprises the processing that each channel carries out Interference Detection:
According to the part of nodes in the predetermined regular triggering system each channel is carried out Interference Detection.
Described predetermined rule comprises:
Each node in system has a detection probability at least or detects frequency, and each interference parameter information according to described probability or frequency detecting channel.
Different detection probabilities is set or detects frequency at different channels in the described node.
Described detection probability or detection frequency configuration are according to the channel circumstance real-time change.
Described channel circumstance is meant the temporal correlation of channel disturbance situation.
Described temporal correlation is that the coefficient correlation between the interference parameter that obtains by original detection of calculating interference parameter that this detection obtains and preservation obtains.
Describedly comprise according to the channel circumstance real-time change:
Increase detection probability when the channel variation frequency surpasses predetermined value or detect frequency, reduce detection probability when the channel variation frequency is lower than predetermined value or detect frequency.
Described increase or reduction detection probability or detection frequency are to increase or reduce a predetermined value by step-length.
Described increase or reduction detection probability or detection frequency are or to detect between the frequency and carry out at the highest detection probability of setting or detection frequency and lowest detection probability.
Among the present invention, when the frequency of channel variation is lower than predetermined value, if the channel disturbance parameter of this moment greater than default threshold value, need report to network coordinator with the interference parameter of preserving.
In described steps A 2, describedly each channel in the system carried out Interference Detection comprise:
For the inoperative channel, determine corresponding interference parameter information by measuring received energy;
And/or,
For working channel, determine corresponding interference parameter information by measuring bag transmission probability of failure;
And/or,
By the average noise of measured channel, determine the interference parameter information of channel.
Described steps A 3 comprises:
The interference parameter information of each channel that the interference parameter information substitution of A31, each channel correspondence of adopt determining is preserved, and as the interference parameter information of each channel of current preservation;
Perhaps,
The interference parameter information calculations of the interference parameter information of each channel that A32, utilization are preserved and each definite channel correspondence is determined new interference parameter information, and described new interference parameter information is preserved as the interference parameter information of each channel of current preservation.
Described steps A also comprises:
When execution in step A32, then need periodically the described interference parameter value of information is upgraded in the processing of degenerating of the interference parameter information of each channel of preserving.
Described degeneration is handled and is comprised:
Set predetermined degeneration processing mode and degeneration treatment conditions, according to described predetermined degeneration processing mode and degeneration treatment conditions to the processing of degenerating of described interference parameter information.
Described method also comprises sets predetermined judging threshold as predetermined channel switching condition, and when described judging threshold was difference threshold, described step B specifically comprised:
Judge whether the difference between the interference parameter information of disturbing minimum channel in the interference parameter information of work at present channel correspondence and the system surpasses predetermined judging threshold, if, then each node carries out the channel hand-off process, described channel is switched as working channel, otherwise, do not carry out the channel hand-off process;
Perhaps, when described judging threshold be absolute door in limited time, described step B specifically comprises:
Judge current detection to the interference parameter value of information of channel correspondence whether be lower than described judging threshold, if then each node carries out the channel hand-off process, described channel is switched as working channel, otherwise, do not carry out the channel hand-off process.
Described step B also comprises:
When determining to carry out the channel hand-off process, then each node in the reporting system carries out the hand-off process of channel, and each node carries out the channel hand-off process after receiving described notice.
Described interference parameter information is: the interfering data value of channel, perhaps, the interfering data value of channel and the user mode information of channel.
Described method also comprises:
C, in individual access network PAN, after wherein dormancy node wakes up, if can not find node original and its mutual communication, then determine the channel of employing of communicating by letter between the node with original and its mutual communication, and utilize corresponding channel access network by the mode of scan channel.
Described step C comprises:
Can't find the node that exchanges information with it at first in the enterprising line scanning of original channel, and when the scanning failure, then again in the enterprising line scanning of other all possible channel, and judge according to the network information of original preservation whether the node of scanning discovery is the node of original mutual communication, when finding the node of original mutual communication, this dormancy node adds network again on new channel.
The network information of described original preservation comprises: network identity and node address.
The grid that described method is used comprises: wireless personal area network WPAN.
The present invention also provides a kind of system that channel switches that realizes in wireless communication system, comprising:
The Interference Detection unit is used for each channel of system is carried out Interference Detection, determines the interference parameter information of each channel correspondence;
The channel switching treatmenting unit carries out the channel hand-off process according to the interference parameter information of each channel correspondence and the channel switching condition of being scheduled to.
Described channel switching treatmenting unit is arranged in the network coordinator, and this moment, and described system also comprises, the switching notice unit is used for sending each node of control to each node and carrying out the channel-switch-announcement that channel switches when determining that need carry out channel switches.
Described system also comprises:
The interfere information memory cell is used to preserve the interference parameter information of each channel correspondence of determining the Interference Detection unit, and is used to offer the channel switching treatmenting unit and calls.
Described Interference Detection unit is arranged in network coordinator and/or the node, and when described Interference Detection unit is arranged in the node, also be provided with disturbed condition in the described node and report the unit, be used for the packet of the detected interference parameter information in Interference Detection unit by predetermined format reported network coordinator.
Described Interference Detection unit specifically comprises:
The initial examination and measurement processing unit is used for when network is set up, each channel of gated sweep, and detect the interference parameter information of determining each channel;
Upgrade and detect processing unit, be used for after network is set up, under incident triggering or Time Triggered, detect the interference parameter information of determining each channel.
As seen from the above technical solution provided by the invention, the method switched by rational working channel of the present invention has reduced to disturb in the system influence to communication process.
And, because the triggering and the report of Interference Detection, and the judgment condition of channel switching or the setting of threshold value, make the corresponding condition of satisfying only to be arranged or reach corresponding threshold value and just carry out the channel switching, and this process must be for some time accumulation, therefore, realization of the present invention can also effectively avoid too frequent channel to switch, also can avoid " table tennis " effect, promptly frequent switches at two interchannels repeatedly.
In addition, because channel table provided by the invention record is the interference level of whole PAN, therefore, the overall interference level of PAN is taken all factors into consideration in realization of the present invention, thereby makes the channel handover operation have certain justice and reasonability.
Description of drawings
Fig. 1 is the specific implementation schematic diagram of the method for the invention;
Fig. 2 is the structural representation of PAN;
Fig. 3 is the specific implementation schematic diagram of system of the present invention.
Embodiment
The present invention mainly is in communication system, can realize the channel handover operation according to the interference detection results (being the interference parameter information of channel) of channel.For example, can in the process that network is set up, detect and write down the interference level of channel, after network foundation is finished, can detect interference in time, and utilize the more interference parameter information of the channel of new record of detected interference, switch so that determine according to the channel disturbance situation after upgrading whether needs carry out channel, and determining to carry out under the situation that channel switches, the node of whole network is all switched to above the new working channel.
The present invention realizes that in the specific implementation process entity of the operational processes of detection record and renewal channel disturbance can be existing network coordinator, carries out the respective channel hand-off process by network coordinator according to the channel disturbance level control of record.
Below in conjunction with Fig. 1 specific implementation of the present invention is described, as shown in Figure 1, comprises:
Step 11: when network is set up, all possible working channel is scanned, give network coordinator with the interference level and the report that detect and write down each channel by each node;
Described interference level is weighed with interference parameter information, and described interference parameter information comprises and is not less than zero the interfering data value information and the user mode information of channel accordingly;
Need to prove, when setting up network, network coordinator self also needs all possible working channel is scanned, and write down the disturbed condition of weighing with the interfering data value information of all possible working channel and the user mode information of channel, wherein, described user mode is meant that whether certain channel uses or still be not used, and is perhaps banned use of by the user etc.
In network coordinator, specifically can preserve a channel table, write down the disturbed condition and the user mode of all channels by this channel table.
Step 12: after network is set up, the content that network coordinator also needs to put down in writing in the channel table to its record according to Interference Detection that receives and report is upgraded, therefore, in system, need to judge the current condition of carrying out Interference Detection that whether meets, as time conditions or event condition etc., when judgement meets corresponding conditions, then continue execution in step 13, otherwise continue to judge whether to meet the condition of carrying out Interference Detection;
That is to say, if disturbed condition changes in system, for example, the disturbed condition that node report is new or infer disturbed condition according to the time and can change, then network coordinator also need according to current detection to disturbed condition upgrade the information that writes down in the channel table of being preserved;
After network is set up, specifically can carry out the Interference Detection of channel by Time Triggered and Event triggered, wherein:
(1) mode of described Time Triggered is that node in the middle of the PAN is preserved the default identical scan period, when the scan period at first, node scans available channel, obtains disturbed condition;
The Interference Detection mode of described Time Triggered is applicable to unresponsive business, and this is to learn disturbed condition because unresponsive business is difficult to send probability of failure by the calculated data bag usually.
In addition, because the number of node is very big usually in the middle of the PAN, if each node all adopts the mode of Time Triggered to carry out Interference Detection and jamming report, then can consume too many resource, therefore, among the present invention can by the user in advance in the middle of the specified network some node have the Interference Detection ability, other node does not need to carry out Interference Detection, promptly only the selection portion partial node detects, and obtains an approximate result.
But because the unpredictability of disturbing, make and be difficult to definite node that need detect, therefore, can adopt at random method to determine the node that detects, like this to disturbing under the complete condition of unknown, the result who obtains detects on statistics with elaborately planned some node and equates, and algorithm is simple, as long as increase the accuracy that the probability that detects just can improve the result.Simultaneously, for the variation of adaptive channel, can also make the detection probability real-time change.
That is to say, to the Channel Detection of Time Triggered, in each sense cycle at first, be not to allow central all nodes of PAN all carry out Channel Detection, but detect according to detection probability or detection frequency selection portion partial node, obtain the relevant detection result; Wherein, described detection probability or detect that frequency can be adjusted in real time or also can not adjust.
For this reason, need be in the middle of system, at least have a detection probability or detect frequency at each node, and each interference parameter information according to described detection probability or detection frequency detecting channel, can different detection probabilities is set or detect frequency for it for different channels, promptly each channel carries out Interference Detection according to relevant detection probability or detection frequency respectively.
Simultaneously, described detection probability or detect that frequency can also be according to the channel circumstance real-time change, described channel circumstance is the temporal correlation of channel disturbance situation, and described temporal correlation is to obtain by the coefficient correlation between the interference value that detected that calculates this detected interference value and preserved in the past.
Specifically can in node, be set to: during channel variation ratio very fast (promptly change frequency and surpass predetermined value), increase detection probability or detection frequency, during channel conversion slow (being that change frequency is lower than predetermined value), reduce detection probability or detect frequency.Increase or reduce operation by step-length in the time of each increase or reduction detection probability or detection frequency, promptly increase or reduce a definite value.The variation of detection probability or detection frequency need or detect in the frequency range and realize at the highest and lowest detection probability that is provided with, promptly when detection probability or detect and just can not increase again when frequency is increased to the highest detection probability or detects frequency, when detection probability or detect and just can not reduce again when frequency is reduced to lowest detection probability or detection frequency.
Adopt detection probability among the present invention and detect frequency when carrying out Interference Detection control, it is basic identical that relevant detection is handled implementation procedure.With the detection probability is example, and the concrete detection implementation procedure that detects according to described detection probability selection portion partial node is as follows:
When sense cycle began, node determined whether carrying out Channel Detection according to probability, and for example, each cycle is detected with probability 0.1.For the variation of adaptive channel, described detection probability can real time altering, and promptly the excursion of determining according to the detection probability of each node maintenance and highest detection probability and lowest detection probability changes.In each cycle, each node carries out Interference Detection according to the detection probability of self maintained.
For example, each node all has a detection probability, be assumed to be 0.5, node disturbs with 0.5 Probability Detection in each cycle, also stipulates highest detection probability, lowest detection probability and each detection probability change step simultaneously, supposes that the highest detection probability is 1, the lowest detection probability is 0.1, each detection probability change step is 0.1, and then the variation of detection probability need change in 0.1 to 1 scope, and each change value is 0.1.
In each node, also need to safeguard a table, by the disturbed condition of the last scanning of each channel of this table record.If node carries out Channel Detection once more, then testing result is compared with the result in the past who preserves, calculate correlation or similitude, if correlation is bigger, the result is more similar in other words, just reduces detection probability, till reaching the lowest detection probability; If correlation is smaller, difference gets distantly as a result in other words, just increases detection probability, till reaching the highest detection probability.
Wherein, the formula that described correlation calculations adopts can for: the interference value of establishing last time is (a1, a2 ..., an), current interference value is (b1, b2 ..., bn), coefficient correlation is (a1 * b1+a2 * b2+ so ... + an * bn)/sqrt[(a12+a22+ ... + an2) (b12+b22+ ... + bn2)], the evolution that " sqrt " in the formula refers to calculates.If obviously twice interference value is equal fully, the coefficient correlation that calculates so is 1, at this time is relevant fully.Simultaneously,, can set 2 correlation thresholdings,, just reduce detection probability greater than 0.8, just increase detection probability less than 0.2 such as 0.2 and 0.8 for ease of carrying out the adjustment of detection probability.
For ease of understanding to foregoing description, now lifting a concrete application example describes: the detection probability of supposing node A is 0.3, last three channel disturbance values that detect are (10,20,30), current three channel disturbance values that detect are (20,30,50), calculating coefficient correlation is 0.99, so the reduction detection probability is as being reduced to 0.2 (establishing each probability change step is 0.1); The concrete numerical value that reduces can carry out the reduction adjustment of detection probability according to the reduction numerical value of predetermined set or the mode of reduction.The processing of corresponding raising detection probability is similar, no longer describes in detail herein.
, need to prove: when channel variation is slow, if the channel disturbance value of being preserved greater than default thresholding, even do not carry out new Interference Detection, also needs the interference value of preserving is reported to network coordinator herein.This is slow because the bigger channel of interference ratio also might change, at this moment, though need not to detect the size that also can estimate interference parameter, therefore, need to consider this interference parameter.Described default thresholding can be provided with as equipment receiving sensitivity, transmitting power etc. according to system parameters, and is strong as the equipment receiving ability, and then this thresholding is high, and transmitting power is big, and it is high that this thresholding is also wanted.
(2) mode of described Event triggered is, having taken place influences incident that information disturbs and just can trigger node and carry out Interference Detection accordingly;
For example, the serious situation of node discovery interference ratio just triggers carries out Interference Detection, node finds that the more serious method of interference ratio can be that the transmission packet probability of failure of adding up surpasses predetermined thresholding, then by all possible working channel of node scan, and disturbed condition reported to network coordinator, network coordinator upgrades the channel interference information of preserving;
Perhaps, exist, also can scan all possible working channel, and disturbed condition is noted if network coordinator itself detects to disturb;
Perhaps, when adding network, also need scan all possible working channel, and the disturbed condition of these channels is reported to network coordinator when miscellaneous equipment by it; For example, after network is set up,, when adding, this node also needs disturbed condition is reported to network coordinator if there is new node to add in the middle of the PAN.
Step 13: when judgement met the condition of carrying out Interference Detection, then node corresponding or network coordinator just carried out the Interference Detection of channel;
When network is set up and after setting up, at the metering system of the interference level of channel can for: measure the disturbed condition that average noise obtains system by special hardware module; Perhaps, can also determine the disturbed condition of channel by the mode of measuring received energy for the inoperative channel, promptly for the inoperative channel, the received energy that measures is exactly the energy that disturbs; Perhaps, for not judging the interference level working channel of (because the energy that receives by working channel comprises the energy of interference and the energy of useful signal) according to received energy, can send probability of failure according to packet and judge, because described probability of failure is with there being the relation of determining between the interference level.
Step 14: detection architecture is sent to the interference coordination device as jamming report, with disturbed condition to interference coordination device reporting information;
After carrying out Interference Detection, the method of report disturbed condition can for: disturbed condition is sent to network coordinator by a special packet (promptly is specifically designed to the packet that carries out the specific format that disturbed condition reports), loaded information comprises in the described packet: the quantification of each channel disturbed condition, simultaneously, the identity information that can also comprise the node that reports this disturbed condition is as endpoint node, router or network coordinator.
Step 15: after network coordinator is received described jamming report, then need the interfere information of the respective channel correspondence of preserving is upgraded processing;
Be that network coordinator carries out the moment that interfere information upgrades and comprises: network coordinator is whenever received the channel interference information that a jamming report just can upgrade once to be preserved; When detecting interference, can upgrade its channel interference information of preserving too for network coordinator self.
The concrete grammar that the interfere information of preserving is upgraded can for: directly utilize new detected interfere information to replace the original interfere information of preserving, upgrade realizing; Perhaps, utilize new detected interfere information to carry out the renewal of interfere information in conjunction with the original interfere information of preserving.
When carrying out the renewal of interfere information for the interfere information that utilizes detected interfere information in conjunction with original preservation, for the availability of the interfere information after the renewal is provided, can according to the time of preserving to the processing of degenerating of the interfere information of original preservation, thereby make that the interfere information of long more original preservation of time is more little to the influence of current interfere information.The reason of handling of degenerating is that interference is a random process, and constantly variation, and current interference in time had certain correlation with former interference, and the time that promptly differs is long more, and correlation is more little.Therefore, if directly current interference is added on the interfere information of original preservation, then can't obtain interfere information accurately.
Among the present invention, the concrete degeneration processing mode that adopts can for: at the interference value of two different time points, reason owing to correlation, original relative interference value can be multiply by a deterioration index α (t), deterioration index is relevant with the time, α (∞)=0 wherein, α (0)=1, the increase of t in time, the value of α (t) diminishes.In the specific implementation process, can a timer be set there at network coordinator, at set intervals the relative interference value of preserving is done once to degenerate and handle operation, for example, make relative interference value reduce by half etc.
Like this, when needs carry out the interfere information renewal, interference parameter value after directly will degenerating adds or deducts new interference parameter value and gets final product, perhaps, also can adopt the interference parameter after other any account form utilizations are degenerated to determine the current corresponding interference parameter information of corresponding information that needs preservation with new detected interference parameter.In order to guarantee to disturb numerical value to be unlikely to overflow, summation that can the regulation plus-minus is 0, and such as 3 channels, wherein channel 1 adds 6, and channel 2 and channel 3 subtract 3.
In carrying out interfere information renewal processing procedure, can also be that the disturbed condition that respective nodes measures adds different weights according to the identity of node, for example, the interference that records is 6, and the weight of setting is: endpoint node is constant, and router takes advantage of 2, network coordinator takes advantage of 6, upgrading the corresponding interfere information in processing back according to corresponding weights so is respectively: endpoint node is 6, and router is 12, and network coordinator is 36.
Step 16: interference parameter information and predetermined channel switching condition according to each channel of the current preservation of network coordinator are judged the current channel switching condition that whether meets, if then execution in step 17, otherwise, execution in step 12;
In network coordinator, for realizing this step, need set in advance a channel switching condition, described channel switching condition can judge whether to meet the channel switching condition according to this judging threshold afterwards for a judging threshold;
Be specially: when described judging threshold is a relative threshold value, the i.e. handoff threshold value of the difference correspondence between two channel disturbance values, at this moment, in the channel disturbance numerical value of in network coordinator, preserving, if find that the interfere information (promptly disturbing numerical value) of one of them channel correspondence is lower than the channel of current use, and the numerical value that differs then triggers channel and switches greater than described channel switch decision threshold value, and promptly execution in step 17;
Condition for the channel switching, except carrying out the switch decision according to the relative threshold value, can also carry out switch decision according to absolute thresholding, promptly adopt an absolute door limit value as judging threshold, wherein, described absolute thresholding is the thresholding that the network in general that obtains of this Channel Detection is disturbed, for example, node A and D scan, and the interference that obtains is (40,20,10) and (60,20,30), so current absolute thresholding be 2 interference and divided by 2, (50,20,20), do not consider former interference; At this moment, the channel table in the middle of the network coordinator can not exist, and only adjudicates according to each result who detects and whether carries out channel and switch and get final product, and do not need to consider former interference measurement results.
Step 17: when meeting the channel switching condition, then notify node corresponding to carry out the channel handover operation;
Be specially: network coordinator can be selected to disturb little channel as new working channel automatically, and all other nodes change working channel in the middle of the informing network, node changes the working channel of oneself after receiving the order that changes working channel, thereby realizes that corresponding channel switches.
Need to prove at this, in the middle of PAN, can have some dormancy nodes usually, so that save energy.For the channel handover operation that the dormancy node took place between rest period, respective nodes can not receive the order that changes working channel probably.Therefore, after the dormancy node wakes up,,, attempt finding the node of original mutual communication then at first in the enterprising line scanning of original channel if can not find the node of original mutual communication; If scanning failure, then think it to be that switching has taken place channel, so in the enterprising line scanning of other all possible channel, at this moment, need to judge according to original network information of preserving whether the node of scanning discovery is the node of original mutual communication, and the described network information comprises network identity and node address; If can find the node of original mutual communication, the dormancy node adds network again on new channel.
For better understanding, the example with a specific implementation is further explained explanation to the present invention below.Supposing to have only 3 possible working channels, is respectively channel 1, channel 2 and channel 3.
(1) at first, at the establishment stage of network, the structure of PAN as shown in Figure 1, A is a network coordinator, B, C, D and E are general nodes.
By scanning, finding that the interference level of three optional channels is respectively 2,14 and 20 when A sets up network, is working channel so select to disturb minimum channel 1, notes the disturbed condition of 3 channels simultaneously, and the channel table that obtains is as shown in table 1.
Table 1
| Channel number | Interference value | User mode |
| 1 | 2 | Use |
| 2 | 14 | Can use |
| 3 | 20 | Can use |
When B added network, also selective channel 1 was as working channel after 3 channels were scanned, if the interference noise on can't measured channel 1, then B can suppose that the interference of channel 1 is 0, and the interference of measuring channel 2,3 simultaneously is respectively 16,16; B reports disturbed condition, and by the channel table that A upgrades its preservation, obtains channel table as shown in table 2 by command frame to network coordinator A.When reporting disturbed condition, the command frame that B also can be specific, and utilize existing command frame, as Associate Command disturbed condition is carried and send to network coordinator A.
Table 2
| Channel number | Interference value | User mode |
| 1 | 2 | Use |
| 2 | 30 | Can use |
| 3 | 36 | Can use |
Equally, the interference that all obtains three channels by scanning when C, D and E add network is respectively (0,10,16), (0,20,12) and (0,30,6), and after 3 renewals at channel table, channel table becomes result shown in the table 3.
Table 3
| Channel number | Interference value | User mode |
| 1 | 2 | Use |
| 2 | 90 | Can use |
| 3 | 70 | Can use |
Simultaneously, also need according to the predetermined cycle to the processing of degenerating of each value in the channel table, after through a catagen cycle, to channel table execution degeneration algorithm (supposing to reduce by half), it is as shown in table 4 to obtain channel table.
Table 4
| Channel number | Interference value | User mode |
| 1 | 1 | Use |
| 2 | 45 | Can use |
| 3 | 35 | Can use |
(2) secondly, the processing in the network operation stage comprises:
(1) Interference Detection, jamming report and interfere information upgrade
Suppose the mode of detection trigger service time.After the periodic for the first time scanning, because predetermined network element A and D scan, the interference that obtains is (40,20,10) and (60,20,30).D reports to A to the result, and A upgrades channel table according to the testing result of A and D, and the channel table that obtains is as shown in table 5.
Table 5
| Channel number | Interference value | User mode |
| 1 | 101 | Use |
| 2 | 85 | Can use |
| 3 | 75 | Can use |
(2) channel switch decision and notice are carried out
A checks that the interference value of channel table discovery channel 3 is littler than channel 1, supposes judging threshold, and promptly the handoff threshold value is 30, then because the difference between the interference value of each interchannel is lower than threshold value, so do not need to carry out the channel handover operation in the system at present.
After supposing the periodic scan second time, the interference that A and D obtain is respectively (30,30,20) and (50,25,10), and it is as shown in table 6 then to upgrade the back channel table.
Table 6
| Channel number | Interference value | User mode |
| 1 | 181 | Use |
| 2 | 150 | Can use |
| 3 | 105 | Can use |
At this moment, find that the interference value of channel 3 is lower than channel 1, and the value that differs so carrying out channel, is switched above difference threshold 30 in judgement.
A selective channel 3 comes all nodes of informing network to switch on the new working channel as new working channel by broadcast channel change order data.Into channel 3 is made working channel in the back so B, C, D and E receive orders.At this moment, channel table is as shown in table 7.
Table 7
| Channel number | Interference value | User mode |
| 1 | 181 | Can use |
| 2 | 150 | Can use |
| 3 | 105 | Use |
From above-mentioned description at specific embodiment as can be seen, channel can be switched to exactly by the present invention and to disturb on the minimum channel, avoid frequent channel switching process.
The present invention also provides a kind of system that channel switches that realizes in wireless communication system, its specific implementation structure mainly comprises Interference Detection unit and channel switching treatmenting unit as shown in Figure 3, wherein:
(1) described Interference Detection unit is used for each channel of system is carried out Interference Detection, determines the interference parameter information of each channel correspondence;
Described Interference Detection unit can be arranged in network coordinator and the node simultaneously, perhaps, also can be separately set in network coordinator or the node; Need to prove, when described Interference Detection unit is arranged in the node, also be provided with disturbed condition in the described node and report the unit, be used for the packet of the detected interference parameter information in Interference Detection unit by predetermined format reported network coordinator, so that network coordinator obtains described interference parameter information, carry out the channel switch decision and handle.
Described Interference Detection unit specifically comprises:
The initial examination and measurement processing unit is used for when network is set up, each channel of gated sweep, and detect the interference parameter information of determining each channel;
Upgrade and detect processing unit, be used for after network is set up, under Event triggered or Time Triggered, by the interference parameter information that predetermined node (may comprise the interference coordination device) or all node detection are determined each channel, promptly obtain to be used to carry out the interference parameter information of current each channel of interference parameter information updating.
(2) described channel switching treatmenting unit carries out the channel hand-off process according to the interference parameter information of each channel correspondence and the channel switching condition of being scheduled to.
Described channel switching treatmenting unit is arranged in the network coordinator, and this moment, and described system also comprises, the switching notice unit is used for sending each node of control to each node and carrying out the channel-switch-announcement that channel switches when determining that need carry out channel switches.
(3) interfere information memory cell, for ease of storage interference parameter information, described system also comprises this unit alternatively, it is used to preserve the interference parameter information of each channel correspondence of determining the Interference Detection unit, and is used to offer the channel switching treatmenting unit and calls.
In sum, realization of the present invention is feasible can be by carrying out the method that working channel switches, the influence that reduces to disturb according to the channel disturbance testing result.And can avoid too frequent channel to switch and handoff procedure in " table tennis " effect that may occur.And, among the present invention, consider that the channel disturbance level of network integral body is carried out the channel switching, thereby have certain fair and reasonable property.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (30)
1, a kind of method that realizes the channel switching in wireless communication system is characterized in that, comprising:
A, in wireless communication system, detect the interference parameter information of each channel;
B, determine to meet the channel of predetermined channel switching condition, and carry out the channel hand-off process, described channel is switched as working channel according to described interference parameter information.
2, method according to claim 1 is characterized in that, described steps A comprises:
A1, when setting up wireless communication system, by each channel of each node scan in network coordinator and the network, detect to determine the interference parameter information of each channel correspondence, and preserve.
3, method according to claim 1 is characterized in that, described steps A comprises:
A2, in communication process, each channel in the system is carried out Interference Detection and determines the interference parameter information of each channel correspondence;
The interference parameter information of each channel correspondence that A3, basis are determined is upgraded the interference parameter information of each channel of preservation.
4, method according to claim 3 is characterized in that, described steps A 2 comprises:
When taking place to carry out the incident of Interference Detection or arrive predetermined interference detection time, then node triggers automatically or carries out channel disturbance by network coordinator notice node and detect, and determines the interference parameter information of each channel correspondence.
5, method according to claim 4 is characterized in that, in steps A 2, described triggering node comprises the processing that each channel carries out Interference Detection:
According to the part of nodes in the predetermined regular triggering system each channel is carried out Interference Detection.
6, method according to claim 5 is characterized in that, described predetermined rule comprises:
Each node in system has a detection probability at least or detects frequency, and each interference parameter information according to described probability or frequency detecting channel.
7, method according to claim 6 is characterized in that, different detection probabilities is set or detects frequency at different channels in the described node.
8, method according to claim 6 is characterized in that, described detection probability or detection frequency configuration are according to the channel circumstance real-time change.
9, method according to claim 8 is characterized in that, described channel circumstance is meant the temporal correlation of channel disturbance situation.
10, method according to claim 9 is characterized in that, described temporal correlation is that the coefficient correlation between the interference parameter that obtains by original detection of calculating interference parameter that this detection obtains and preservation obtains.
11, method according to claim 8 is characterized in that, describedly comprises according to the channel circumstance real-time change:
Increase detection probability when the channel variation frequency surpasses predetermined value or detect frequency, reduce detection probability when the channel variation frequency is lower than predetermined value or detect frequency.
12, method according to claim 11 is characterized in that, described increase or reduction detection probability or detection frequency are to increase or reduce a predetermined value by step-length.
13, method according to claim 11 is characterized in that, described increase or reduction detection probability or detection frequency are or to detect between the frequency and carry out at the highest detection probability of setting or detection frequency and lowest detection probability.
14, method according to claim 11 is characterized in that, when the frequency of channel variation is lower than predetermined value, if the channel disturbance parameter of this moment greater than default threshold value, need report to network coordinator with the interference parameter of preserving.
15, method according to claim 3 is characterized in that, in steps A 2, describedly each channel in the system is carried out Interference Detection comprises:
For the inoperative channel, determine corresponding interference parameter information by measuring received energy;
And/or,
For working channel, determine corresponding interference parameter information by measuring bag transmission probability of failure;
And/or,
By the average noise of measured channel, determine the interference parameter information of channel.
16, method according to claim 3 is characterized in that, described steps A 3 comprises:
The interference parameter information of each channel that the interference parameter information substitution of A31, each channel correspondence of adopt determining is preserved, and as the interference parameter information of each channel of current preservation;
Perhaps,
The interference parameter information calculations of the interference parameter information of each channel that A32, utilization are preserved and each definite channel correspondence is determined new interference parameter information, and described new interference parameter information is preserved as the interference parameter information of each channel of current preservation.
17, method according to claim 16 is characterized in that, described steps A also comprises:
When execution in step A32, then need periodically the described interference parameter value of information is upgraded in the processing of degenerating of the interference parameter information of each channel of preserving.
18, method according to claim 17 is characterized in that, described degeneration is handled and comprised:
Set predetermined degeneration processing mode and degeneration treatment conditions, according to described predetermined degeneration processing mode and degeneration treatment conditions to the processing of degenerating of described interference parameter information.
According to each the described method in the claim 1 to 18, it is characterized in that 19, described method also comprises sets predetermined judging threshold as predetermined channel switching condition, and,
When described judging threshold was difference threshold, described step B specifically comprised:
Judge whether the difference between the interference parameter information of disturbing minimum channel in the interference parameter information of work at present channel correspondence and the system surpasses predetermined judging threshold, if, then each node carries out the channel hand-off process, described channel is switched as working channel, otherwise, do not carry out the channel hand-off process;
Perhaps,
When described judging threshold be absolute door in limited time, described step B specifically comprises:
Judge current detection to the interference parameter value of information of channel correspondence whether be lower than described judging threshold, if then each node carries out the channel hand-off process, described channel is switched as working channel, otherwise, do not carry out the channel hand-off process.
20, method according to claim 19 is characterized in that, described step B also comprises:
When determining to carry out the channel hand-off process, then each node in the reporting system carries out the hand-off process of channel, and each node carries out the channel hand-off process after receiving described notice.
According to each the described method in the claim 1 to 18, it is characterized in that 21, described interference parameter information is: the interfering data value of channel, perhaps, the interfering data value of channel and the user mode information of channel.
22, according to each the described method in the claim 1 to 18, it is characterized in that described method also comprises:
C, in individual access network PAN, after wherein dormancy node wakes up, if can not find node original and its mutual communication, then determine the channel of employing of communicating by letter between the node with original and its mutual communication, and utilize corresponding channel access network by the mode of scan channel.
23, method according to claim 22 is characterized in that, described step C comprises:
Can't find the node that exchanges information with it at first in the enterprising line scanning of original channel, and when the scanning failure, then again in the enterprising line scanning of other all possible channel, and judge according to the network information of original preservation whether the node of scanning discovery is the node of original mutual communication, when finding the node of original mutual communication, this dormancy node adds network again on new channel.
24, method according to claim 23 is characterized in that, the network information of described original preservation comprises: network identity and node address.
According to each the described method in the claim 1 to 18, it is characterized in that 25, the grid that described method is used comprises: wireless personal area network WPAN.
26, a kind of system that realizes the channel switching in wireless communication system is characterized in that, comprising:
The Interference Detection unit is used for each channel of system is carried out Interference Detection, determines the interference parameter information of each channel correspondence;
The channel switching treatmenting unit carries out the channel hand-off process according to the interference parameter information of each channel correspondence and the channel switching condition of being scheduled to.
27, system according to claim 26, it is characterized in that, described channel switching treatmenting unit is arranged in the network coordinator, and this moment, described system also comprises, the switching notice unit is used for sending each node of control to each node and carrying out the channel-switch-announcement that channel switches when determining that need carry out channel switches.
28, system according to claim 26 is characterized in that, described system also comprises:
The interfere information memory cell is used to preserve the interference parameter information of each channel correspondence of determining the Interference Detection unit, and is used to offer the channel switching treatmenting unit and calls.
29, system according to claim 26, it is characterized in that, described Interference Detection unit is arranged in network coordinator and/or the node, and when described Interference Detection unit is arranged in the node, also be provided with disturbed condition in the described node and report the unit, be used for the packet of the detected interference parameter information in Interference Detection unit by predetermined format reported network coordinator.
According to claim 26,27,28 or 29 described systems, it is characterized in that 30, described Interference Detection unit specifically comprises:
The initial examination and measurement processing unit is used for when network is set up, each channel of gated sweep, and detect the interference parameter information of determining each channel;
Upgrade and detect processing unit, be used for after network is set up, under incident triggering or Time Triggered, detect the interference parameter information of determining each channel.
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| PCT/CN2007/000755 WO2007104244A1 (en) | 2006-03-10 | 2007-03-08 | A method, apparatus and system for realizing channel switching in a wireless communication system |
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| CN101035358B (en) | 2011-11-16 |
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