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WO2007104244A1 - Procédé, appareil et système de commutation de canal dans un système de communication sans voie - Google Patents

Procédé, appareil et système de commutation de canal dans un système de communication sans voie Download PDF

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Publication number
WO2007104244A1
WO2007104244A1 PCT/CN2007/000755 CN2007000755W WO2007104244A1 WO 2007104244 A1 WO2007104244 A1 WO 2007104244A1 CN 2007000755 W CN2007000755 W CN 2007000755W WO 2007104244 A1 WO2007104244 A1 WO 2007104244A1
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WIPO (PCT)
Prior art keywords
channel
interference
parameter information
interference parameter
node
Prior art date
Application number
PCT/CN2007/000755
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English (en)
Chinese (zh)
Inventor
Yongjun Liu
Yongfeng Zhong
Ling Zhang
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007104244A1 publication Critical patent/WO2007104244A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a technology for reducing the influence of communication interference in a wireless communication system.
  • a communication system each channel is required to occupy a channel, and in order to avoid inter-signal interference, different signals can be conveniently distinguished.
  • two simultaneous communication processes cannot occupy the same channel. Therefore, when other radio waves enter the channel range used in the communication process, they become corresponding interference.
  • the interference is small, the error correction capability of the system can be used to resist the interference, but if the interference ratio is large, the communication between the devices will be affected.
  • the interference Since the communication environment changes at any time, the interference also changes with time. For channels with relatively small interference, it may increase the degree of interference to a serious extent affecting normal communication after a period of time, and vice versa. Therefore, based on the real-time variation characteristics of the channel, if the communication process between the two devices is affected by relatively serious interference, in order to reduce the influence of the interference, a new channel with a relatively small interference can be selected to re-establish the communication process for communication. .
  • an adaptive channel switching mechanism can be introduced in the PAN, so that the normal operation of the PAN can be ensured without re-establishing the network.
  • an implementation manner of periodically switching the network working channel by the network coordinator ie, the network manager
  • one cycle means that all possible channels are sequentially used as working channels, and A handover procedure to re-switch to a new channel;
  • the network manager is a device that can manage all nodes in the network.
  • the processing performed by the network manager during the handover period includes operations of the work channel handover decision, work channel selection, notification, and handover.
  • a sequence of switching channels is generated in advance.
  • the node in the PAN determines whether there is adjacent channel interference or co-channel interference according to the received signal during operation. If there is adjacent channel interference or co-channel interference, the next channel in the switching channel sequence is selected as the new working channel, and the selection is also made. New working channel notification Other nodes in the network, other nodes also switch the working channel, and give a response.
  • the node that first informs the handover that receives all the responses completes a handover operation, otherwise re-transmits the handover request. In this way, each time the next channel in the selection sequence is switched, until all channels have been selected, a new switching cycle is started.
  • the communication process may be switched to a relatively poor channel, causing the handover to occur again soon.
  • the number of nodes in the PAN may be relatively large, and if one channel switching is performed for each node to generate interference, the channel switching will be too frequent.
  • different nodes may have different interferences. In the process of processing the average interference of the entire PAN, it is determined by each node whether to perform handover. In this way, the entire network may work under the interference channel most of the time. , is not conducive to the optimization of the overall performance of the network.
  • Embodiments of the present invention provide a method, device, and system for implementing channel switching in a wireless communication system, thereby solving the problem that a corresponding working channel cannot be selected according to a real-time interference situation in a communication network, so that less The number of channel switching operations, select the most suitable working channel.
  • Embodiments of the present invention provide a method for implementing channel switching in a wireless communication system, including: detecting interference parameter information of each channel in a wireless communication system;
  • An embodiment of the present invention provides a system for implementing channel switching in a wireless communication system, including: an interference detecting unit, configured to perform interference detection on each channel in the system, and determine interference parameter information corresponding to each channel;
  • the channel switching processing unit performs channel switching processing based on the interference parameter information corresponding to each channel and the predetermined channel switching condition.
  • An embodiment of the present invention provides a node device, including: an interference detecting unit, configured to perform interference detection on each channel in the system, and determine interference parameters corresponding to each channel;
  • the interference situation reporting unit is configured to report the interference parameter information detected by the interference detecting unit to the network manager by using a data packet of a predetermined format
  • the interference channel switching processing unit performs channel switching processing according to the notification from the network manager.
  • the embodiment of the invention provides a network manager, including:
  • the interference information storage unit is configured to save the interference parameter information corresponding to each channel, and is used for providing the channel switching processing unit to call;
  • the channel switching processing unit performs channel switching processing according to the interference parameter information corresponding to each channel and the predetermined channel switching condition;
  • the handover notification unit is configured to, when determining that channel switching is required, send, to each node, a channel switching notification for controlling each node to perform channel switching.
  • FIG. 1 is a schematic diagram of a specific implementation manner of a method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a PAN in an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a specific implementation manner of a system and a device according to an embodiment of the present invention.
  • the embodiment of the present invention mainly implements a channel switching operation according to a channel interference detection result (i.e., channel interference parameter information) in a communication system.
  • a channel interference detection result i.e., channel interference parameter information
  • the interference level of the channel can be detected and recorded during the establishment of the network. After the network is established, the interference can be detected in time, and the interference parameter information of the recorded channel is updated by using the detected interference, so as to facilitate the update according to the
  • the channel interference condition determines whether channel switching is required. If it is determined, the nodes of the entire network are switched to the new working channel.
  • the operation processing entity that implements the detection and recording of the interference parameter information of the channel in the specific implementation process may be an existing network manager, and the corresponding channel switching process is performed according to the recorded channel interference level control by the network manager;
  • the operation processing entity may also be another entity having similar functions, or may be an entity specially set in the network to implement the corresponding function.
  • the method includes:
  • Step 11 When the network is established, all possible working channels are scanned by each node to detect and record the interference level of each channel and report to the network manager; or, by the network manager itself, for all possible jobs The channel is scanned to detect and record the level of interference for each channel.
  • the interference level is measured by the interference parameter information, and the interference parameter information includes corresponding interference data value information not less than zero and usage state information of the channel;
  • each node and network manager may also scan all possible working channels, and record interference and channel of all possible working channels measured by interference data value information.
  • the usage status information refers to whether a certain channel is in use or not used, or is prohibited from being used by the user.
  • a channel table can be saved in the network manager, and the interference status and usage status of all channels are recorded through the channel table;
  • the step 11 is an optional step, that is, the step is not performed, and only the interference detection is performed when the interference occurs, and the interference level of each channel is obtained and reported to the network manager.
  • Step 12 After the network is established, the network manager also needs to update the content recorded in the channel table recorded according to the received interference detection and report. Therefore, it is necessary to determine whether the current interference detection condition is met in the system. If the time condition or the event condition, etc., when the judgment meets the corresponding condition, proceed to step 13, otherwise continue to determine whether the condition for performing the interference detection is met;
  • the network manager also needs to update the saved according to the currently detected interference situation. Information recorded in the channel table;
  • the interference detection of the channel may be specifically triggered by time triggering and/or event triggering, wherein: (1) the time triggering manner is that the nodes in the PAN save the preset same or different scanning periods. Preferably, the same scanning period is adopted, and when the scanning period starts, the node scans the available channels to obtain an interference situation;
  • the time-triggered interference detection method can be applied to unacknowledged services, because unacknowledged services are often difficult to know the interference situation by calculating the probability of packet transmission failure.
  • the network may be specified in advance by the user. Some nodes have interference detection capability, and other nodes do not need to perform interference detection, that is, only some nodes are selected for detection, and an approximate result is obtained.
  • the detection probability can also be changed in real time.
  • the detection probability or the detection frequency may be adjusted in real time or may not be adjusted.
  • At least one detection probability or detection frequency is required for each node, and the interference parameter information of the channel is detected each time according to the detection probability or the detection frequency, and different channels can be set differently for different channels.
  • the detection probability or the detection frequency that is, the interference detection is performed on each channel according to the corresponding detection probability or detection frequency.
  • the detection probability or the detection frequency may also be changed in real time according to the channel environment, where the channel environment is the time correlation of the channel interference condition, and the time correlation is calculated by calculating the interference value detected this time and The correlation coefficient between the saved previously detected interference values is obtained.
  • the node may be set to: when the channel change is relatively fast (that is, the change frequency exceeds a predetermined value), the detection probability or the detection frequency is increased, and when the channel transformation is relatively slow (that is, the change frequency is lower than a predetermined value), the detection probability is lowered. Or detect the frequency. Each time the detection probability or the detection frequency is increased or decreased, the increase or decrease operation is performed in steps, that is, a certain value is increased or decreased.
  • the detection probability or the change of the detection frequency needs to be implemented within the set maximum and minimum detection probability or detection frequency range, that is, when the detection probability or the detection frequency increases to the highest detection probability or detection frequency, it cannot be increased again, when the detection probability or detection When the frequency is reduced to the lowest detection probability or detection frequency, it can no longer be reduced.
  • the corresponding detection processing implementation process is basically the same.
  • the specific detection implementation process of selecting a partial node to perform detection according to the detection probability is as follows - whenever the detection period starts, the node determines whether to perform channel detection according to the probability, for example, each period has a probability of 0.1. Test.
  • the detection probability may be changed in real time, that is, according to the detection probability maintained by each node and the variation range determined by the highest detection probability and the lowest detection probability.
  • each node performs interference detection based on the detection probability of its own maintenance.
  • each node has a detection probability, which is assumed to be 0.5.
  • the node detects the interference with a probability of 0.5, and also specifies the highest detection probability, the lowest detection probability, and the step size of each detection probability. It is assumed that the highest detection probability is 1, and the lowest detection probability is 0.1, and the detection probability change step is 0.1, and the change of the detection probability needs to be changed within the range of 0.1 to 1. . 1.
  • the correlation calculation may be performed by: formulating that the last interference value is (al, a2, ..., an), and the interference value is (bl, b2, , bn), then the correlation
  • the coefficient is 2 (al X M+a2 X b2+ ⁇ +an X bn) I (af+a2 2 +'"+an 2 +bl 2 +b2 2 + ⁇ +bn 2 ), and the interference value correlation of one channel , is 2al X bl/(al 2 +bl 2 ).
  • the threshold of the two correlation values for example, it can be set to 0. 2 and 0. 8, greater than 0.8 to reduce the detection probability, less than 0.2 to increase the detection probability.
  • the preset threshold may be set according to system parameters, such as device receiving sensitivity, transmitting power, etc. If the device receiving capability is strong, the threshold is higher, the transmitting power is larger, and the threshold is also higher.
  • the event triggering manner is that an event that affects the information interference occurs, and the node is triggered to perform the interference detection;
  • the node finds that the interference is serious it triggers the interference detection.
  • the method that the node finds that the interference is serious may be that the probability of sending the packet failure or the number of failures exceeds a predetermined threshold, then the node scans all possible working channels, and The interference situation is reported to the network manager, and the network manager updates the saved channel interference information;
  • the network manager itself detects the presence of interference, it will also scan all possible working channels and record the interference; Or, when other devices join the network, they can also scan all possible working channels and report the interference of these channels to the network manager; for example, after the network is established, if there are new nodes in the PAN To join, the interference can also be reported to the network manager when the node joins.
  • Step 13 When it is judged that the condition for performing interference detection is met, the corresponding node (which may include a node as a network manager) performs interference detection of the channel;
  • the measurement method of the interference level of the channel may be: obtaining the interference condition of the system by measuring the average noise value or the signal-to-noise ratio by a special hardware module; or, determining the channel by measuring the received energy.
  • the interference situation that is, the measured received energy is the energy of the interference; or, in order to more accurately estimate the interference on the working channel (because the energy received through the working channel includes the energy of the interference and the energy of the useful signal),
  • the probability of packet transmission failure or the number of failures is determined because there is a certain relationship between the failure probability or the number of failures and the interference level; these methods can be applied separately or in combination to obtain more accurate the result of.
  • Step 14 For each node, the detection result is sent to the network manager as a interference report to report the interference of the information to the network manager.
  • the method of reporting the interference condition may be: sending the interference situation to the network manager through a special data packet (ie, a specific format data packet dedicated to the interference situation report), the data
  • the information carried in the packet includes: a quantized interference situation of each channel, such as interference data value information or usage status information of the channel, and may also include identity information of a node that reports the interference condition, such as an end node or a router.
  • a quantized interference situation of each channel such as interference data value information or usage status information of the channel
  • identity information of a node that reports the interference condition such as an end node or a router.
  • Step 15 After receiving the interference report, the network manager needs to perform corresponding processing, for example, updating the interference information corresponding to the saved corresponding channel;
  • the time when the network manager performs the interference information update includes: the network manager updates the interference parameter information of the saved channel every time an interference report is received; when the network manager detects the interference, it also The interference parameter information of the saved channel is updated.
  • the specific method for updating the saved parameter information may be: directly replacing the originally saved interference parameter information with the newly detected interference parameter information to implement updating; or using the newly detected interference information in combination with the original saved information.
  • the interference information is used to update the interference information.
  • the availability of the updated interference parameter information may be saved according to the saved time.
  • the interference parameter information is subjected to degradation processing, so that the longer the time, the smaller the influence of the originally stored interference parameter information on the current interference parameter information.
  • the reason for the degradation treatment is mainly because the interference is a random process, which changes with time, and the current interference has a certain correlation with the previous interference, that is, the longer the phase difference, the smaller the correlation. Therefore, if the current interference is directly added to the originally saved interference parameter information, accurate interference parameter information will not be obtained.
  • a timer can be set in the network manager to perform a degrading operation on the saved relative interference data values at intervals, for example, halving the relative interference value.
  • the degraded interference parameter value may be directly added or subtracted from the new interference parameter value, or any other calculation method may be used to utilize the degraded interference parameter and newly detected.
  • the interference parameter determines the interference parameter information corresponding to the corresponding channel that needs to be saved currently. In order to ensure that the interference parameter value does not overflow, the sum of addition and subtraction can be specified as 0, such as 3 channels, where channel 1 is increased by 6, and channel 2 and channel 3 are decremented by 3.
  • the interference condition measured by the corresponding node may be added with different weights according to the identity of the node. For example, the measured interference is 6 and the set weight is: the end node is unchanged. The router multiplies 2, and the network manager multiplies by 6. Then, the corresponding interference information after the corresponding weight update processing is: the end node is 6, the router is 12, and the network manager is 36.
  • Step 16 According to the interference parameter information of each channel currently saved by the network manager and the predetermined channel switching condition, it is determined whether the channel switching condition is currently met, and if yes, step 17 is performed, otherwise, step 12 is performed;
  • a channel switching condition needs to be set in advance, and the channel switching condition may be a threshold value, and then the channel switching condition is determined according to the threshold value;
  • the threshold value of the decision is a relative threshold, that is, a handover threshold corresponding to the difference between the two channel interference values, if the channel interference value saved in the network manager is found, If the interference information corresponding to one channel (ie, the interference value) is lower than the currently used channel, and the value of the phase difference is greater than the channel handover decision threshold, the channel switching is triggered, that is, step 17 is performed;
  • the handover decision may be performed according to the absolute threshold, that is, an absolute threshold is used as the decision threshold, wherein the absolute threshold is this time.
  • the threshold of the overall interference of the network obtained by channel detection for example, the absolute threshold is 50, and a certain interference detection determines the network
  • the average channel interference values of channel 1, channel 2 and channel 3 are (100, 60, 20), respectively, and the working channel is channel 1, then it needs to switch to channel 3; in addition, the relative threshold and absolute can also be The threshold is used in combination, that is, if and only if the working channel interference value exceeds the absolute threshold, and the difference between the interference value of the other channel and the other channel exceeds the relative threshold, the switching operation is performed.
  • Step 17 When the channel switching condition is met, the corresponding node is notified to perform a channel switching operation. Specifically, the network manager can automatically select a channel with small interference as a new working channel, and notify all other nodes in the network to change the working channel. After receiving the command to change the working channel, the node changes its working channel to implement the corresponding channel switching.
  • the wake-up sleepy node first scans on the original channel, and tries to find the node that originally communicated with each other; if the scan fails, it is considered to be the channel. Switching occurs, and scanning is performed on all other possible channels. If the range of channels used is specified in advance, and each node is notified, the node saves the range of channels used, then all possible channels are saved by the nodes.
  • Channel usage information such as a list of channels.
  • the network information includes a network identifier and a node address; if the nodes that originally communicated with each other can be found, according to the original
  • the working channel currently used by the nodes communicating with each other determines the working channel that the sleeping node should use (ie, the sleeping node tries all channels according to the channel list or one by one until receiving messages from the nodes that originally communicated with each other, and then knows that the original communication with each other is known.
  • the working channel currently used by the node which is the channel currently used by the network, and the sleeping node rejoins the network on the new channel.
  • the embodiments of the present invention are further explained below with a specific implementation example. Assume that there are only three possible working channels, namely channel 1, channel 2 and channel 3.
  • FIG. 1 First, in the establishment phase of the network, the structure of the PAN is shown in Figure 1.
  • A is the network manager, and B, C, D, and E are general nodes.
  • A When A establishes the network, it scans and finds that the interference levels of the three optional channels are 2, 14 and 20 respectively, so the channel 1 with the smallest interference data value is selected as the working channel, and the interference of the three channels is recorded at the same time.
  • the channel table is shown in Table 1.
  • 3 20 can be used when B joins the network, and after scanning 3 channels, channel 1 is also selected as the working channel. If the interference noise on channel 1 cannot be measured, the Bay IJB can assume that the interference of channel 1 is 0, and the channel is measured at the same time.
  • the interference data values of 2 and 3 are 16, 16 respectively;
  • B reports the interference condition to the network manager A through the command frame, and A updates its saved channel table to obtain the channel table as shown in Table 2.
  • B can also use the existing command frame, such as the associated command, to send the interference to the network manager A without using a specific command frame.
  • the processing in the network operation phase includes:
  • the interference data values obtained by the predetermined network elements ⁇ and D are (40, 20, 10) and (60, 20, 30).
  • D reports the result to A, and
  • A updates the channel table according to the detection results of A and D, and the obtained channel table is shown in Table 5.
  • A checks the channel table and finds that the interference value of channel 3 is smaller than that of channel 1. Assuming that the threshold is determined, that is, the handover threshold is 30, since the difference between the interference values between the channels is lower than the threshold, There is currently no need to perform channel switching operations in the system.
  • the updated channel table is shown in Table 6.
  • the interference value of channel 3 is lower than that of channel 1, and the value of the phase difference exceeds the difference threshold 30, and then the channel switching is decided.
  • A selects channel 3 as the new working channel, and broadcasts the channel change command data to notify all nodes of the network to switch to the new working channel. Then, B, C, D, and E change the working channel to channel 3 after receiving the command. At this time, the channel table is as shown in Table 7. Table 7
  • the channel can be accurately switched to the channel with the least interference by the embodiment of the present invention, avoiding frequent channel switching procedures.
  • the embodiment of the present invention further provides a system for implementing channel switching in a wireless communication system, and a specific implementation structure thereof is shown in FIG. 3, which mainly includes an interference detecting unit and a channel switching processing unit, where:
  • the interference detecting unit is configured to perform interference detection on each channel in the system, and determine interference parameter information corresponding to each channel;
  • the interference detecting unit may be set in the network manager and other nodes at the same time, or may be separately set in the network manager or other nodes; it should be noted that when the interference detecting unit is set in the node
  • the node is further configured with an interference situation reporting unit, configured to report the interference parameter information detected by the interference detecting unit to the network manager by using a data packet of a predetermined format, so that the network manager obtains the interference Parameter information, performing channel switching decision processing.
  • the interference detecting unit specifically includes:
  • An initial detection processing unit configured to control scanning each channel when the network is established, and detect interference parameter information of each channel
  • An update detection processing unit configured to determine, by an predetermined node (possibly including an interference coordinator) or all nodes, the interference parameter information of each channel after the network is established, that is, obtained for performing Interference parameter information of each channel currently interfering with parameter information update.
  • the channel switching processing unit performs channel switching processing based on interference parameter information corresponding to each channel and predetermined channel switching conditions.
  • the channel switching processing unit is configured in the network manager, and at this time, the system further includes: a handover notification unit, configured to send, to each node, a channel switch to control each node when determining that channel switching is required. Channel switching notification.
  • the system further optionally includes the unit, configured to save interference parameter information corresponding to each channel determined by the interference detection unit, and used to provide the channel information Switch processing unit calls.
  • the implementation of the embodiment of the present invention makes it possible to reduce the influence of interference by performing a working channel switching according to the channel interference detection result.
  • the channel switching is performed only if the corresponding condition is met or the corresponding threshold is reached, and the process must have a section.
  • the accumulation of time therefore, the implementation of the embodiment of the present invention can also effectively avoid too frequent channel switching, and can also avoid the "ping-pong" effect, that is, frequently repeating switching between two channels.
  • the channel table provided by the embodiment of the present invention records the interference level of the entire PAN, the implementation of the embodiment of the present invention comprehensively considers the overall interference level of the PAN, so that the channel switching operation has certain fairness and rationality.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé, un appareil et un système de commutation de canal dans un système de communication sans fil. A cet effet, on détecte tout d'abord l'information concernant le paramètre d'interférence de chaque canal dans le système de communication sans fil et on détermine ensuite quel canal remplit les conditions de commutation de canal en question d'après l'information concernant le paramètre d'interférence, on effectue la commutation de canal, canal qui devient alors un canal de travail. Par l'application d'un procédé rationnel de commutation du canal de travail, on réduit efficacement les interférences causées par la procédure de communication dans le système. On évite aussi d'avoir à répéter les procédures de commutation de canal, puisque la commutation ne s'effectue que si la condition requise est remplie ou si le seuil correspondant est atteint. De plus, on tient compte du degré d'interférence complet de telle sorte que la commutation de canal soit, dans la mesure du possible, correcte et rationnelle.
PCT/CN2007/000755 2006-03-10 2007-03-08 Procédé, appareil et système de commutation de canal dans un système de communication sans voie WO2007104244A1 (fr)

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