JP4555134B2 - Method for determining communication frequency of radio link - Google Patents

Method for determining communication frequency of radio link Download PDF

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JP4555134B2
JP4555134B2 JP2005095592A JP2005095592A JP4555134B2 JP 4555134 B2 JP4555134 B2 JP 4555134B2 JP 2005095592 A JP2005095592 A JP 2005095592A JP 2005095592 A JP2005095592 A JP 2005095592A JP 4555134 B2 JP4555134 B2 JP 4555134B2
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communication frequency
link
traffic volume
radio link
radio
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雅之 石崎
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株式会社日立国際電気
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  TECHNICAL FIELD The present invention relates to a radio link communication frequency determination method, and in particular, to determine a radio link communication frequency executed in a mesh type fixed radio access system in which a plurality of radio station apparatuses are connected by radio links using a plurality of communication frequencies. Regarding the method.

  In a conventional subscriber radio access system, a P-P method (Point to Point) in which a base station and a user are connected one-to-one to perform communication, and one base station and a plurality of users communicate simultaneously. An FWA system called P-MP system (Point to Multiple Point) or mesh type system has been proposed (reference: Nomoto et al. “Next Generation Fixed Wireless Access System”, The University of Science, B-5-270 , 2001).

  An outline of a configuration example of a conventional mesh type FWA system will be described with reference to FIG. In the following description, a link refers to a wireless propagation path that is transmitted and received by a pair of wireless devices, and a node refers to a wireless station equipped with a wireless device that can establish a plurality of links. The amount of traffic means the total amount of data from the subscriber accommodation device that is transmitted and received between the nodes.

  The mesh type FWA system dynamically adapts to changing traffic (reuse of communication frequency, changes in routing), and controls to maximize the traffic capacity of the entire system. Adaptive modulation control function for avoiding transmission errors (FIG. 6A), communication frequency switching function for avoiding interference waves due to reuse of communication frequency (FIG. 6B), other Optimal control of the system is realized by cooperatively operating a communication frequency switching function (FIG. 6C) for avoiding interference waves from the system.

  In the above case, the antenna used in each link is a parabola with a sharp directivity, etc., and the direction is fixed in a one-to-one manner when installing a node so that communication can be performed with maximum power. At the same time, interference to other nodes is minimized. Note that a wireless device applied to the mesh FWA system is disclosed in Patent Document 1, for example. This wireless device has the above-described functions by having a line quality determination function, an interference wave detection function, a traffic volume observation function, and the like. Other related technologies are disclosed in Japanese Patent Application Laid-Open Nos. 2003-273799, 2002-345016, and 2003-339072.

  Here, the communication frequency determination method of the conventional mesh type | mold FWA system is demonstrated. 7 to 9 show the state of connection of each node by the link and the state of the communication frequency assigned to the link. In this case, the display with the link a (Fb) indicates that the frequency b is allocated to the link a. Regarding the straight line representing the link, the solid line indicates that the link is already in operation, and the dotted line indicates that the communication has not yet been performed and the state before the start of operation. Indicates a link.

  In the above-described example of such a mesh type FWA system, there are four communication frequencies (b = 1 to 4), and the same communication frequency cannot be assigned to different links in the same node. In this example, the node pairs indicated by the nodes D and A; the nodes C and B; the nodes B and E; and the nodes I and F are arranged close to each other. When communication is performed at the same frequency, the communication quality is deteriorated due to interference with each other. Similarly, it is assumed that communication quality deteriorates due to interference even when the link 5 and the link 6 communicate at the same frequency.

  In the system configuration of FIG. 7, there are seven nodes, and five of them are connected by four links. In such a state, the node A and the node B are further connected by the link 1. In this case, since the node B has used the communication frequencies F2 and F4 for connection with the nodes C and E, the remaining usable communication frequencies are F1 and F3. However, since the nodes D and A are arranged close to each other as described above, the same communication frequency F3 as that of the link 3 cannot be used, and the communication frequency is selected so that only the F1 can be used. It is connected like this.

In the state of being connected as shown in FIG. 8, if it is attempted to further connect the node B and the node I, in the node B, the communication frequencies F1, F2, and F4 have already been used, and the remaining ones are communication. Since only the frequency F3 is present, the link 6 is connected at the communication frequency F3. When the communication frequency is determined in such a procedure, the link 5 and the link 6 are operated in a state where the influence of the interference wave is large as shown in the precondition.
JP 2004-260698 A

  The above-described problems are difficult to avoid because even when an antenna with a narrow beam width such as a parabola or cassegrain is used, a completely pinpoint beam cannot be constructed. In addition, if the interference state as described above is left unattended, a radio transmission error occurs, causing problems such as packet loss and throughput reduction. If it occurs on a link with a small amount of traffic, it can be avoided by changing the modulation method, etc., but if the modulation method is switched to one with a low multi-value number when the traffic amount is large, there is a problem that throughput degradation cannot be avoided. appear.

  The present invention has been made to solve the above-described problems. Even when communication frequency switching for avoiding interference waves cannot be performed, the traffic volume of each link is taken into consideration, and the mesh type FWA system as a whole is considered. It is an object of the present invention to provide a method for determining a communication frequency of a radio link for minimizing a seen decrease in traffic capacity.

  In order to solve the above-described problems, a radio link communication frequency determination method according to the present invention is executed in a mesh type fixed radio access system in which a plurality of radio station apparatuses are connected by radio links using a plurality of communication frequencies. In the radio link communication frequency determining method, when each radio station apparatus determines the radio link communication frequency, the radio link having the maximum interference power for the radio link whose traffic volume is smaller than a predetermined traffic volume threshold is used. And a second allocation method that allocates a communication frequency having the minimum interference power to a radio link having a traffic volume larger than a predetermined traffic volume threshold. Execute at least one of the allocation methods.

  According to such a configuration, when determining the communication frequency of the radio link in each radio station apparatus, the communication frequency with the largest interference power is assigned to the radio link whose traffic volume is smaller than a predetermined traffic volume threshold. A communication frequency with the smallest interference power is assigned to a radio link whose traffic volume is larger than a predetermined traffic volume threshold.

  As described in detail above, according to the present invention, when determining the communication frequency of the radio link in each radio station apparatus, the communication frequency with the largest interference power is applied to the radio link whose traffic volume is smaller than a predetermined threshold. Is assigned, and a communication frequency with the smallest interference power is assigned to a radio link whose traffic volume is larger than a predetermined threshold. As a result, the frequency of occurrence of packet loss in each radio link is reduced, and a decrease in throughput in the entire mesh type fixed radio access system can be suppressed.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart for explaining a first embodiment of a radio link communication frequency determining method according to the present invention. FIG. 2 is a flowchart for explaining a second embodiment of a radio link communication frequency determining method according to the present invention. FIG. 3 is a connection relationship diagram showing a connection example of each node of a mesh type fixed wireless access system connected by a radio link, and FIG. 4 is a traffic amount in a predetermined link shown in the connection relationship diagram of FIG. FIG. 5 is a graph showing the temporal transition of the traffic volume corresponding to the traffic volume threshold. FIG. 5 shows that the frequency used in the wireless link of the node B in FIG. 3 is changed in relation to the temporal transition of the traffic volume in FIG. It is a connection relation figure which shows the latter state.

  A first embodiment of a radio link communication frequency determining method in the mesh type fixed radio access system shown in the flowchart of FIG. 1 will be described. In the processing by the radio link communication frequency determination method of FIG. 1, when determining the radio link communication frequency, the radio link having the maximum interference power is set to the radio link whose traffic volume is smaller than a predetermined threshold. I try to assign it. Further, it is necessary to perform the processing by this radio link communication frequency determination method as many as the number of links used in the radio station. Here, as an example, processing for a certain link will be described. In this case, the traffic amount threshold is a traffic amount that is half of the maximum wireless transmission amount in one link.

  First, a link L1 is set as a target link (Ltarget) to be processed (S11). In this example, link settings are updated in the order of L1, L2, L3, and L4. It is determined whether the target traffic volume (Ttarget), which is the traffic volume of the set target link, is smaller than the traffic volume threshold (Tthreshold) described above (S12). If the target traffic volume is not smaller than the traffic volume threshold, the communication frequency is not changed, so that the process proceeds to step S22, and the target link is updated or terminated (described later).

  If it is determined in step S12 that the target traffic volume is smaller than the traffic volume threshold, the communication frequency F1 is used as the first communication frequency for comparison with the target communication frequency (Ftarget) used for the target link. Set as (Fcomp) (S13). In this case, the frequency set as the comparative communication frequency is updated in the order of F1, F2, F3, and F4. After the setting in step S13, it is determined whether the target communication frequency and the comparison communication frequency are not the same or the same (S14).

  If it is determined in step S14 that the target communication frequency and the comparison communication frequency are the same, the process proceeds to step S20, and update processing such as updating of the set communication frequency is performed. If it is determined that the target communication frequency and the comparison communication frequency are not the same, the comparison traffic amount (Tcomp) that is the traffic amount of the comparison link (Lcomp) that is the link using the comparison communication frequency is the traffic amount threshold. It is determined whether it is larger (S15).

  If it is determined in step S15 that the comparison traffic volume is not greater than the traffic volume threshold value, the communication frequency is not changed, so the process proceeds to step S20, and update processing such as updating the set communication frequency is performed. When the comparison traffic volume is larger than the traffic volume threshold, it is determined whether or not the target interference power (Itarget) that is the interference power for the target communication frequency is smaller than the comparison interference power (Icomp) that is the interference power for the comparison communication frequency. (S16).

  If it is determined in step S16 that the target interference power is not smaller than the comparison interference power, the process proceeds to step S20 to perform update processing such as updating the set communication frequency. If the target interference power is smaller than the comparison interference power, it is determined whether a comparison link exists (is used) in the same node (S17). When the comparison link exists, the target communication frequency of the target link and the comparison communication frequency of the comparison link are exchanged (S18). If there is no comparison link, the target communication frequency of the target link is changed to the comparison frequency (S19).

  After the process of step S18 or S19 is completed, it is determined whether the communication frequency used for the process is F4, that is, whether the process is completed using all F1 to F4 as the comparison frequencies (S20). If the comparison frequency is not F4, since all the processes for the comparison frequency are not completed, the comparison frequency is updated to the next comparison frequency (S21), and then the process proceeds to step S14. In step S20, if the comparison frequency is F4, the processing has been completed for all the comparison frequencies, so the process proceeds to step S22, and the target link is updated or terminated.

  In step S22 after the end of step S12 or step S20, in order to update or end the target link, it is determined whether or not the target link of the process is L4 (S22). If the target link is not L4, processing has not been completed for all links, so the target link is updated to the next link (S23), and the process returns to step S12. However, if the target link is L4, the process is completed because all the links have been processed.

  Next, a second embodiment of the radio link communication frequency determination method shown in the flowchart of FIG. 2 will be described. In the processing by the radio link communication frequency determination method of FIG. 2, when determining the radio link communication frequency, the radio link having a minimum interference power is set to a radio link whose traffic volume is larger than a predetermined threshold. I try to assign it. Various preconditions for the processing by the radio link communication frequency determination method are the same as those in the first embodiment.

  A link L1 is set as a target link (Ltarget) to be processed (S31). Also in this example, the link settings are updated in the order of L1, L2, L3, and L4. It is determined whether the target traffic volume (Ttarget), which is the traffic volume of the set target link, is larger than the traffic volume threshold (Tthreshold) (S32). If the target traffic volume is not larger than the traffic volume threshold value, the communication frequency is not changed, so the process proceeds to step S42, and the target link is updated or terminated (described later).

  If it is determined in step S32 that the target traffic volume is larger than the traffic volume threshold, the communication frequency F1 is set as the comparison communication frequency as the first communication frequency for comparison with the target communication frequency used for the target link. (S33). In this case, the frequency set as the comparative communication frequency is updated in the order of F1, F2, F3, and F4. After the setting in step S33, it is determined whether the target communication frequency and the comparison communication frequency are not the same or the same (S34).

  If it is determined in step S34 that the target communication frequency and the comparison communication frequency are the same, the process proceeds to step S40, and update processing such as updating of the set communication frequency is performed. If it is determined that the target communication frequency and the comparison communication frequency are not the same, the comparison traffic amount (Tcomp) that is the traffic amount of the comparison link (Lcomp) that is the link using the comparison communication frequency is less than the traffic amount threshold. It is determined whether it is small (S35).

  If it is determined in step S35 that the comparison traffic volume is not smaller than the traffic volume threshold value, the communication frequency is not changed. Therefore, the process proceeds to step S40, and update processing such as updating of the set communication frequency is performed. If the comparison traffic volume is smaller than the traffic volume threshold, it is determined whether the target interference power (Itarget) that is the interference power for the target communication frequency is greater than the comparison interference power (Icomp) that is the interference power for the comparison communication frequency. (S36).

  If it is determined in step S36 that the target interference power is not greater than the comparison interference power, the communication frequency is not changed. Therefore, the process proceeds to step S40, and update processing such as updating of the set communication frequency is performed. If the target interference power is larger than the comparison interference power, it is determined whether or not a comparison link exists (is used) at the same node (S37). When the comparison link exists, the target communication frequency of the target link and the comparison communication frequency of the comparison link are exchanged (S38). If there is no comparison link, the target communication frequency of the target link is changed to the comparison frequency (S39).

  After the process of step S38 or S39 is completed, it is determined whether or not the comparison communication frequency used for the process is F4, that is, whether or not the process is completed using all F1 to F4 as the comparison frequencies (S40). If the comparison frequency is not F4, not all the processes for the comparison frequency are completed, so the comparison frequency is updated to the next comparison frequency (S41), and then the process proceeds to step S34. In step S40, if the comparison frequency is F4, the process has been completed for all comparison frequencies, so the process proceeds to step S42, and the target link is updated or terminated.

  In step S42 after the end of step S32 or step S40, it is determined whether or not the target link of the process is L4 in order to update or end the target link (S42). If the target link is not L4, processing has not been completed for all links, so the target link is updated to the next link (S43), and the process returns to step S32. However, if the target link is L4, the processing for all the links has been completed, so the processing in that cycle is terminated.

  Next, the temporal transition of the traffic volume and the communication frequency determination processing operation will be described with reference to FIGS. In this case, FIG. 3 shows a network configuration in this example, and shows how the nodes A to I are connected. In particular, the link 1 (F3) is placed in a state where interference is large. It shows that. FIG. 4 shows the transition of the traffic amount of each link in the node B. In this example, the execution cycle of the communication frequency determination process is an interval of 2 hours, and the process starts at time 0:00.

  First, the communication frequency determination process at time 0 executed in the node B will be described. At this time, the traffic amount of the link 1 of the node B (“T1-0” in FIG. 4; 1 represents traffic, 0 represents time) is smaller than the traffic amount threshold (Tthreshold), and the traffic of the link 6 The amount (T6-0 in FIG. 4) is larger than the traffic amount threshold. Therefore, the communication frequency F3 with high interference power is assigned to the link 1, and the communication frequency F1 with low interference power is assigned to the link 6.

  At the subsequent execution times of 2 o'clock and 4 o'clock, the magnitude relationship of the traffic volume of the links 1 and 6 with respect to the traffic volume threshold does not change, so the communication frequency for the links 1 and 6 is not changed or exchanged. However, in the execution cycle at time 6:00, the magnitude relationship between the traffic volumes of links 1 and 6 is reversed, and the traffic volume of link 1 (T1-6) is larger than the traffic volume threshold, and the traffic volume of link 6 ( T6-6) is smaller than the traffic volume threshold.

  Since the magnitude relationship of the traffic volume of the links 1 and 6 is reversed in this way, the communication frequency F1 having a small interference power is allocated to the link 1, and the communication frequency F3 having a large interference power is allocated to the link 6. Exchange. Therefore, the network configuration after the exchange is as shown in FIG. This state does not change from 8:00 to 16:00.

  However, in the execution cycle at time 18:00, the magnitude relationship of the traffic volume of links 1 and 6 is reversed, and the traffic volume of link 1 (T1-18) is smaller than the traffic volume threshold, and the traffic volume of link 6 ( T6-18) is larger than the traffic volume threshold. Therefore, in the communication frequency determination process, the communication frequencies of link 1 and link 6 are exchanged, and the communication frequency allocation status of each link changes as shown in FIG. Therefore, it is possible to guarantee a state in which the interference power is small in the link 6 in which the traffic amount is large. Note that the communication frequency is not changed or exchanged between 18:00 and 22:00 because the magnitude relationship between the traffic volumes of the links 1 and 6 does not change.

It is a flowchart for demonstrating Embodiment 1 of the communication frequency determination method of the radio | wireless link of this invention. It is a flowchart for demonstrating Embodiment 2 of the communication frequency determination method of the radio | wireless link of this invention. It is a connection relation figure which shows the example of a connection of each node of the mesh type fixed radio | wireless access system connected by the radio link. It is a graph which displays the time transition of the traffic amount in the predetermined link shown by the connection relation figure of FIG. 3 corresponding to a traffic amount threshold value. FIG. 5 is a connection relationship diagram illustrating a state after the frequency used in the radio link of the node B in FIG. 3 is changed in relation to the temporal transition of the traffic amount in FIG. 4. It is a figure for demonstrating the structural example of the conventional mesh type | mold FWA system. It is a connection relation figure which shows the example of a connection of each node of the conventional mesh type | mold fixed radio | wireless access system. FIG. 8 is a connection relation diagram for explaining a connection relation of each node after link 1 is connected in FIG. 7. FIG. 9 is a connection relation diagram for explaining the connection relation of each node after the link 6 is further connected in FIG. 8.

Explanation of symbols

Ltarget target link, Lcomp comparison link, Ttarget target traffic volume, Tcomp comparison traffic volume, threshold traffic volume threshold, F1, F2, F3, F4 communication frequency, Ftarget target communication frequency, Fcomp comparison communication frequency, Itarget target interference power, Icomp comparison Interference power, A, B, C, D, E, F, I node, S11 to S23, S31 to S43.

Claims (2)

  1. A plurality of communication frequency determination method of the radio link to be executed by the mesh type non line access system for connecting a wireless link using a plurality of communication frequencies between the radio station apparatus,
    When each radio station apparatus determines the communication frequency of the radio link,
    A communication frequency assigned to a radio link whose traffic volume is smaller than a predetermined traffic volume threshold, and the radio link whose traffic volume is larger than the traffic volume threshold and whose interference power is larger than the communication frequency of the radio link A communication frequency determining method for a radio link, wherein a communication frequency is assigned so as to replace a communication frequency assigned to another radio link different from the above .
  2. In a radio link communication frequency determination method executed in a mesh-type radio access system in which a plurality of radio station apparatuses are connected by radio links using a plurality of communication frequencies.
    When each radio station apparatus determines the communication frequency of the radio link,
    A communication frequency assigned to a radio link whose traffic volume is larger than a predetermined traffic volume threshold, and the radio link whose traffic volume is smaller than the traffic volume threshold and whose interference power is smaller than the communication frequency of the radio link Assign a communication frequency to replace the communication frequency assigned to another wireless link different from
    A method for determining a communication frequency of a radio link.
JP2005095592A 2005-03-29 2005-03-29 Method for determining communication frequency of radio link Expired - Fee Related JP4555134B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0823567A (en) * 1994-07-11 1996-01-23 Hitachi Ltd Radio communication system and speech channel assignment method
JP2003204337A (en) * 2002-01-09 2003-07-18 Hitachi Kokusai Electric Inc Radio station for meshed radio accessing system
JP2003273799A (en) * 2002-03-19 2003-09-26 Hitachi Kokusai Electric Inc Radio access system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0823567A (en) * 1994-07-11 1996-01-23 Hitachi Ltd Radio communication system and speech channel assignment method
JP2003204337A (en) * 2002-01-09 2003-07-18 Hitachi Kokusai Electric Inc Radio station for meshed radio accessing system
JP2003273799A (en) * 2002-03-19 2003-09-26 Hitachi Kokusai Electric Inc Radio access system

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