JP5622322B2 - Communication coexistence method by communication coexistence system - Google Patents

Description

  The present invention relates to a communication coexistence method by a communication coexistence system suitable for a plurality of communication systems coexisting in the same band.

  Conventionally, standardization of a wireless communication network using TV White Space (TVWS) has been promoted, and in particular, in recent years, standardization of a method for coexisting different IEEE802 standards in TVWS (IEEE802.19 standard) has also been promoted. . For this reason, it is particularly important how these different IEEE 802 standard communication systems coexist in the same frequency band, and the importance of the communication system is increasing with the recent dramatic increase in wireless communication opportunities.

  For example, as shown in FIG. 10, in the case where two or more different wireless communication systems 7 and 8 coexist, first, in the wireless communication system 7, a coordinator 71 serving as a base station and a portable device capable of wireless communication with the coordinator 71 The wireless communication system 8 includes a coordinator 81 that serves as a base station and devices 82a to 82c that include mobile terminals that can wirelessly communicate with the device.

  At this time, the interference range indicated by the shaded area where the communicable ranges from the coordinators 71 and 81 overlap is an area where the radio signal can reach from either of the coordinators 71 and 81. In particular, when both the radio communication systems 7 and 8 use the same frequency channel, the device 82a in such an interference range actually performs other radio communication with the coordinator 81 when it performs other radio communication. The communication system 7 is subject to interference.

  For this reason, when operating two or more different wireless communication systems in the same frequency band, it is necessary to establish a coexistence method that can coexist in the same space without interfering with each other. Conventionally, as shown in Patent Document 1, for example, a coexistence technique has been proposed that enables mutual coexistence without the influence of mutual interference caused by mutual wireless communication networks (see, for example, Patent Document 1).

US 2010/0008297

  However, the technology disclosed in Patent Document 1 described above merely describes coexistence processing based on a beacon protocol or the like in an IEEE 802.22 wireless communication system. For this reason, in the IEEE802.19.1 system, coexistence processing for preventing high-precision interference is actually performed using coexistence control means (Coexistence Manager: CM) and CDIS (Coexistence Discovery and Information Server) described later. The current method has not been proposed yet.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is when the control by the coexistence control means (CM) or CDIS is performed in the IEEE 802.19.1 system. Another object of the present invention is to propose a communication coexistence method using a communication coexistence system capable of performing coexistence processing for highly accurate interference prevention.

In order to solve the above-described problem, a communication coexistence method according to the present invention includes one or more in a jurisdiction in a coexistence system between wireless communication networks that perform wireless communication between one or more devices and a coordinator. Coexistence control means for controlling each coexistence process by the wireless communication network, and a first interface for storing each piece of information transmitted from the plurality of coexistence control means and for transmitting / receiving data to / from the coexistence control means Using a coexistence system comprising a first timer and a storage means for controlling the second timer, and identifying whether the storage means has received a new message from the coexistence control means or the timer has expired However, if none is identified, the identification step for repeatedly executing the identification step and the identification step In the step of determining whether or not a new message has been received, a determination step of determining whether the message is from an already authenticated coexistence control means, and a message of the already authenticated coexistence control means in the determination step If it is determined that the first timer is activated, the second timer is stopped, the second timer is stopped, the counter is set to 0, and the CM from the coexistence control means in the identification step. When a registration request message is received, the storage means that has identified it updates the registration information of the coexistence control means, and other wireless communication adjacent to the wireless communication network that the coexistence control means has jurisdiction over Registration information of other coexistence control means that have jurisdiction over the network (hereinafter referred to as adjacent registration information) And the processing operation executing step of performing Pudeto, when identifying the expiration of the first timer at least the identification step, transmits a request signal to the coexistence control means from said storage means, said second timer The coexistence control means that has received the request signal and resets the counter and increments the counter by one, and when the timer control step A that shifts to the active state and the expiration of the second timer are identified in the identification step, If the counter is less than the predetermined value, the process proceeds to the timer control step A. If the counter reaches the predetermined value, the registration information of the coexistence control means already registered in the processing operation execution step is deleted. At the same time, the fact that the registration information of the coexistence control means has been deleted indicates that the other adjacent wireless communication network has been deleted. A timer control step B for updating the adjacent registration information in the network, and after the processing operation execution step, the timer control step A, and the timer control step B are completed, the process returns to the identification step.

  According to the present invention having the above-described configuration, the first timer resets and restarts the second timer each time it expires and increments the counter by one. When the expiration of the second timer is identified, the process of resetting the second timer and incrementing the counter by 1 is repeatedly executed until the counter n reaches a predetermined value. If the counter reaches a predetermined value, the already registered other adjacent wireless communication network information is deleted and the list of new adjacent other wireless communication networks is updated, and this coexistence control is performed. Repeat the process of sending to the means. Thereby, it is possible to perform communication coexistence processing for preventing interference with high accuracy by controlling the timing of updating the registration information.

It is a block diagram of the coexistence system between the radio | wireless communication networks to which this invention is applied. It is a schematic diagram of a hierarchical structure under one CDIS in a coexistence system between wireless communication networks to which the present invention is applied. It is a flowchart for demonstrating the communication coexistence method in the communication coexistence system to which this invention is applied. It is another flowchart for demonstrating the communication coexistence method in the communication coexistence system to which this invention is applied. It is a flowchart in the case of shifting to C and D. It is a flowchart in the case of shifting to E and F. It is a flowchart in the case of shifting to G and H. It is a flowchart in the case of shifting to I and K. It is a flowchart in the case of shifting to L and M. It is a figure for demonstrating the problem of a prior art.

  Hereinafter, embodiments of the present invention will be described in detail.

  A communication coexistence system between wireless communication networks to which the present invention is applied is a system in which the IEEE 802.19.1 standard is implemented and coexistence processing can be performed even when TV White Space (TVWS) exists. However, the communication system to which the present invention is applied is not limited to this, and may be applied in coexistence processing between any other systems in a space other than TVWS.

  As shown in FIG. 1, a communication coexistence system 1 between wireless communication networks to which the present invention is applied has a plurality of CMs capable of transmitting and receiving information between one CDIS (Coexistence Discovery and Information Server) 2 and the CDIS. (Coexistence Manager) 3 and CE 4 (Coexistence Enabler) capable of transmitting / receiving information to / from each CM 3 are provided. In FIG. 1, two CMs 3a and 3b capable of transmitting and receiving information to and from CDIS, and two CEs 4a-1 and 4a-2 that are in the jurisdiction of this CM 3a and that can transmit and receive information only with this CM 3a, The description will be made by taking as an example a case where it is in the jurisdiction of the CM 3b and includes only the CM 3b and one CE 4b capable of transmitting and receiving information. However, the present invention is not limited to this. Further, the CDIS 2 is not limited to the case where only one CDIS 2 is provided, and may be provided in a plurality. If a plurality of CDISs 2 are provided, they must be synchronized with each other.

  The communication coexistence system 1 between the wireless communication networks can transmit and receive information to and from the TVWS database 5 outside. Specifically, CDIS 2 or CM 3 can transmit / receive information to / from this database 5.

  The communication coexistence system 1 between the wireless communication networks to which the present invention is applied is a coexistence process that allows the wireless communication networks 6 outside the system to coexist with each other in adjacent spaces without causing communication interference. Will continue. The CE 4 is mounted on the wireless communication network 6 as the coexistence process target. The wireless communication network 6 includes a coordinator 61 that serves as a base station of the network, and a plurality of devices 62 that can perform wireless communication with the coordinator 61.

  One CE is provided in the coordinator 61 of one assigned radio communication network 6. For example, the CE 4a-1 is mounted in the coordinator 61a-1 in the assigned wireless communication network 6a-1. The CE 4a-2 is mounted in the coordinator 61a-2 in the assigned wireless communication network 6a-2. The CE 4b is mounted in the coordinator 61b in the assigned wireless communication network 6b.

  Hereinafter, each component of the communication coexistence system 1 between wireless communication networks to which the present invention is applied will be described in detail.

  CDIS 2 is a server that describes various types of information related to coexistence processing at least between wireless communication networks 6 and provides various useful information stored in itself when CM 3 actually controls coexistence processing. Further, the CDIS 2 accesses the TVWS database 5 and acquires usable information necessary for coexistence with the primary user in the TVWS and accumulates it. In addition, the CDIS 2 stores information on the radio communication network 6 and the CE 4 that are in charge of each CM 3. That is, this CDIS2 plays a role as an interface with the CM3 and makes various decisions on coexistence processing, including the discovery of adjacent wireless communication networks. It also serves as a storage means.

  The CM 3 makes a decision regarding coexistence processing as necessary. The CM 3 generates each request command or response command related to the coexistence process, and transmits it to the CDIS 2 or the CE 4. In addition, the CM 3 receives each request command or response command transmitted from the CDIS 2 or the CE 4 and makes various decisions regarding coexistence or executes a processing operation. In addition, when the CE 4 itself does not make a decision regarding coexistence, the CM 3 may perform the decision making instead of the CE 4. In addition, CM3 also performs the coexistence control by itself or assists this even when coexistence processing with TVWS is performed. Incidentally, this CM3 is assigned the jurisdiction of each CE4. The CM 3 may be mounted on the coordinator 61 or may be provided individually on the Internet.

  FIG. 2 schematically shows a hierarchical structure in a communication coexistence system 1 between wireless communication networks to which the present invention is applied. According to FIG. 2, for example, CE4a-1, CE4a-2, and CE4a-3 are assigned as the jurisdiction of the CM 3a. As the jurisdiction of CM3b, CE4b-1, CE4b-2, CE4b-3, and CE4b-4 are assigned. Further, CE4c-1, CE4c-2, and CE4c-3 are assigned as the jurisdiction of CM3c. For example, the CM 3a has various communication information such as which channel each of the CE4a-1, CE4a-2, and CE4a-3 in its jurisdiction uses, what is its communication range, and which communication standard is used. Basically try to grasp all. The grasped communication information is stored in a storage unit (not shown) in the CM 3. Further, when communication information related to CE 4 within its own jurisdiction is updated, it may be updated as needed. Note that the communication information about CE4b-1 to CE4b-4 under the jurisdiction of the other CM3b and the like is in an unknown state at the initial stage.

  Incidentally, the communication information here includes all information related to communication such as CM3 ID, network ID, service area, network communication standard and communication method, and various decision making methods in addition to channel information.

  The CE 4 is an enabler that relays communication between the coordinator 61 and the device 62 in the wireless communication network 6 and between the CMs 3 and executes various processes relating to coexistence. This CE 4 is actually mounted in the coordinator 61 in the wireless communication network 6, and transmits various requests and responses regarding coexistence generated by the coordinator 61 or received from the device 62 to the CM 3. The CE 4 sends various requests and responses regarding coexistence transmitted from the CM 3 to the coordinator 61 and the device 62. The CE 4 mainly plays a role as an enabler, and performs processing for replacing a signal to be transmitted / received with another standard as necessary, or converting a signal to be transmitted / received into another signal. That is, the dotted arrows between the CE 4 and the coordinator 61 in FIG. This CE4 is divided into jurisdiction groups under CM3, and one CE4 does not belong to two or more CM3 jurisdiction groups.

  Since the CE 4 is mounted on the wireless communication network 6, it can be said that the determination of the CE 4 represents the determination of the wireless communication network 6 (including the coordinator 61 and the device 62) itself.

  The TVWS database 5 is a database that stores a list of channels already occupied by the primary user. The TVWS database 5 also stores a list of channels that are not already occupied.

  The device 62 can perform wireless packet communication with the coordinator 61 based on the IEEE 802 standard, and further can perform wireless packet communication with another device 62 via the coordinator 61. The device 62 is, for example, a mobile terminal such as a mobile phone or a personal computer (PC).

  Similarly, the coordinator 61 may have the same configuration as the device 62 described above. The coordinator 61 serves as a central control unit in the wireless communication network 6. The coordinator 61 may be provided with a mounting portion (not shown) to which the CE 4 can be mounted.

  In addition, either the wireless communication network 6 or the device 62 and the coordinator 61 can access the TVWS database 5 and may download an effective TVWS channel.

  Incidentally, a communication control station for controlling communication in the wireless communication network 6 may be separately provided in the wireless communication network 6.

  Next, a coexistence method in the communication coexistence system 1 between wireless communication networks to which the present invention is applied will be described.

  First, as shown in FIG. 3, in step S11, it is checked whether or not the communication coexistence system 1 can connect to the TVWS database 5. Next, the process proceeds to step S12, and the CDIS 2 identifies whether a new message has been received from the CM 3 or whether the timer has expired. Incidentally, A is located between step S11 and step S12. As a result, if none of the CDIS2 identifies, CDIS2 returns to A again and repeats the process of step S12. On the other hand, if the CDIS 2 identifies that a new message has been received from the CM 3 or identifies that the timer has expired, the process proceeds to step S13.

  Next, the process proceeds to step S13, and it is determined whether or not the CM 3 that is the transmission source of the new message received in step S12 has already been authenticated. As a result, if the CM 3 is not yet authenticated, the process proceeds to B in FIG. On the other hand, if it is determined that the message has already been authenticated, the process proceeds to step S14.

  In step S14, the first timer is activated, the second timer is stopped, and the counter is set to zero. Here, the first timer and the second timer are timers that are uniquely set and controlled in CDIS2, and are used to control how many times the coexistence processing method to which the present invention is applied is repeatedly executed. It is. The first timer may be restarted every time a new message is received. In such a case, the first timer has the meaning of measuring the time since the last message was received. The counter is a counter for each ID assigned to each CM 3, called CM_ID. After step S14 is completed, the process proceeds to B.

  When the process moves to B, the process moves to step S15, and it is determined whether the content received from the CM 3 in step S12 is a new message or the expiration of the timer is notified. If it is determined that a new message has been received, the process proceeds to step S16. On the other hand, when the expiration of the timer is notified, it is further determined whether the expiration of the first timer is notified or the expiration of the second timer is notified. When the expiration of the first timer is notified, the process shifts to L. When the expiration of the second timer is notified, the process shifts to M.

  If the process proceeds to step S16, it is confirmed whether the new message is from CM3. In this flow, it is assumed that new messages are from CM3 to the last, but messages from CM3 may be mixed. If it is determined in step S16 that a message other than CM3 has been received, the process proceeds to A and step S12 is executed again. If it is determined in step S16 that the CM3 message has been received, the content of the message is read.

  Messages from the CM 3 can be classified into connection requests, authentication requests, CM registration requests, registration release requests, authentication release requests, valid channel acquisition requests, information acquisition requests, session active requests, other message receptions, and the like. If a connection request message is received, the process proceeds to C. When an authentication request message is received, the process proceeds to D. When the CM registration request message is received, the process proceeds to E. When a registration cancellation request message is received, the process proceeds to F. When the authentication cancellation request message is received, the process proceeds to G. If a valid channel acquisition request message is received, the process proceeds to H. When the information acquisition request message is received, the process proceeds to I. When a session active request message is received, the process proceeds to J. If another message is received, the process proceeds to K.

  Hereinafter, a detailed flowchart of C to M shown in FIG. 4 will be described.

  First, the case of shifting to C will be described with reference to FIG. Upon receiving the connection request message from the CM 3, the CDIS 2 transmits a connection response to the CM 3 in step S21 when permitting connection to the CM 3. The CM 3 that has received such a connection response can determine that the connection to the CDIS is permitted.

  Table 1 shows details of a connection request message transmitted from the CM 3 to the CDIS 2.

  Table 2 shows details of a connection response message transmitted from CDIS 2 to CM 3.

  Next, the case of shifting to D will be described with reference to FIG. CDIS2, which has received the authentication request message from CM3, checks the authentication status of CM3 in step S22. If the CM 3 has not been authenticated yet and authentication is permitted in the future, an authentication response is transmitted to the CM 3 in step S23.

  Table 3 shows details of an authentication request message from CM 3 to CDIS 2.

  Table 4 shows details of the authentication response from CDIS2 to CM3.

  Next, the case of shifting to E will be described with reference to FIG. First, CDIS2 that has received the CM registration request message from CM3 updates the registration information of CM3 in its own database (step S24). The registration information here includes information such as which channel each wireless communication network 6 managed by the CM 3 uses at which point. This registration information may include information such as network ID, network type, channel information, communication range, interference range, and the like. Further, when information is detected from each device 62, information such as a channel occupation rate and an interference level is also included. Next, CDIS2 transmits a registration response to CM3 in step S25. This registration response is a signal for notifying CM 3 that the update in CDIS 2 has been completed. Next, CDIS2 updates adjacent registration information in step S26. The adjacent registration information is registration information of another CM 3 that has jurisdiction over another radio communication network 6 that is adjacent to the radio communication network 6 that is under the jurisdiction of the CM 3. As the adjacent registration information, a list of other adjacent wireless communication networks 6 may be described. In this list, for example, information such as a network ID, a network type, an operation channel, and the like is described for each adjacent wireless communication network 6.

  Next, in step S27, the adjacent registration information for which this update has been performed is transmitted to the other CM 3. This makes it possible to know that the adjacent registration information has been updated in the other CM 3 that has jurisdiction over the adjacent wireless communication network 6.

  Table 5 shows details of a CM registration request message transmitted from the CM 3 to the CDIS 2.

Table 6 shows details of a registration response message transmitted from CDIS 2 to CM 3.

  Table 7 shows details of a message of adjacent registration information transmitted from CDIS2 to CM3.

  Next, the case of shifting to F will be described with reference to FIG. First, the CDIS 2 that has received the registration cancellation request message from the CM 3 cancels the registration of the CM 3 from the registration information in its own database (step S28). Next, CDIS2 transmits a registration response to CM3 in step S29. This registration response is a signal for notifying the CM 3 that the update due to the release of the CM 3 in the CDIS 2 is completed. Next, CDIS2 cancels the registration of CM3 in the adjacent registration information in step S26 (step S30). Next, in step S31, the adjacency registration information for which this update has been performed is transmitted to the other CM 3. As a result, in the other CM 3 having jurisdiction over the adjacent wireless communication network 6, it is possible to know that the update has been performed by canceling the registration of the CM 3 in the adjacent registration information.

  Table 8 shows the details of a deregistration request message transmitted from CM 3 to CDIS 2.

  Table 9 shows details of a registration response message transmitted from the CDIS 2 to the CM 3 in response to the registration cancellation request.

  Next, the case where it transfers to G is demonstrated using Fig.7 (a). Upon receiving the authentication cancellation request message from the CM 3, the CDIS 2 executes an authentication cancellation process for the CM 3, and then transmits an authentication cancellation response to the CM 3 as shown in step S32. The CM 3 that has received this authentication cancellation response can identify that the authentication has been canceled on the CDIS 2 side.

  Table 10 shows details of an authentication cancellation request message transmitted from CM 3 to CDIS 2.

  Table 11 shows details of an authentication cancellation request message transmitted from CDIS2 to CM3.

  Next, the case of shifting to H will be described with reference to FIG. The CDIS 2 that has received the valid channel acquisition request message from the CM 3 checks whether or not a valid channel exists in the database (step S33). Then, as necessary, the checked effective channel is transmitted from CDIS 2 to CM 3. When transmitting information on the effective channel, it is assumed that a restriction range and a list of effective channels are included, and the effective channel list describes a channel number, a transmission output limit, and the like. Table 12 shows details of an effective channel acquisition request message transmitted from CM 3 to CDIS 2.

  Table 13 shows details of transmission contents of an effective channel transmitted from CDIS2 to CM3.

  Next, the case of shifting to I will be described with reference to FIG. In step S34, the CDIS 2 that has received the information acquisition request message from the CM 3 checks whether the information that has received the acquisition request is stored in its own database. Next, the process proceeds to step S35, and an information acquisition response is transmitted from CDIS2 to the CM3. The information acquisition response may include the information that has received the acquisition request, and if the information that has received the acquisition request is not stored in its own database, that information should be included. Also good.

  In the case of shifting to J, the description by the flowchart is omitted, but the CDIS 2 receives the section activation request, and performs the activation operation in the period specified in the request.

  Table 14 shows details of signals for confirming whether the section is actually active from CDIS2 to CM3.

  Table 15 shows details of a signal for replying that CM 3 is active from CM 3 to CDIS 2.

  Next, the case of shifting to K will be described with reference to FIG. When another message reception is received from the CM 3, as shown in step S35, the CM 3 is notified that the message is not supported. As a result, the CM 3 can know that such other messages are not supported.

  Next, when shifting to L, explanation will be made with reference to FIG. First, in step S36, CDIS2 transmits a session active request to CM3. As a result, the CM 3 is activated in the period. Next, in step S37, the second timer is reset. At the same time, 1 is added to the counter n.

Next, in the case of shifting to M, description will be made with reference to FIG. First, in step S38, the counter value n is compared with Max. This Max is a preset threshold value and corresponds to the number of times this flow is executed. If n is less than Max, move to L. On the other hand, if n is equal to Max, the process proceeds to the next step S39. In step S39, CM3 is deleted in CDIS2. Next, in step S40, the fact that the CM3 has been deleted is updated in the adjacent registration information.

  In addition, after performing C to M, all return to A.

  As described above, in the communication coexistence method to which the present invention is applied, three information such as the first timer, the second timer, and the counter are controlled in CDIS2.

  That is, the first timer is a so-called short-span timer, and the second timer is a so-called long-span timer.

  Here, each time the first timer expires, the second timer is reset and restarted, and the counter is incremented by one. When the expiration of the second timer is identified, the process of resetting the second timer and incrementing the counter by 1 is repeatedly executed until the counter n reaches a predetermined value. Then, when the counter reaches a predetermined value, the processes of steps S39 to S41 described above are executed. Thereby, it is possible to perform communication coexistence processing for preventing interference with high accuracy by controlling the timing of updating the registration information.

  The present invention is not limited to the above-described embodiment. For example, CDIS2 may have a first interface (not shown) for transmitting / receiving data to / from CM3. This first interface is used to provide information for registering a television frequency band network to CDIS2. Further, this first interface is used for acquiring the adjacency registration information from CDIS2.

  The CDIS 2 may have a second interface for transmitting / receiving data to / from the database 5. The second interface is used to obtain at least valid channel information from the database 5.

  The first interface described above may be used to provide effective channel information to the database 5.

1 Communication coexistence system 2 CDIS
3 CM
4 CE
5 Database 6 Wireless communication network 61 Coordinator 62 Device

Claims (3)

In a coexistence system between wireless communication networks that perform wireless communication between one or more devices and a coordinator,
Coexistence control means for controlling each coexistence process by one or a plurality of wireless communication networks in the jurisdiction and each piece of information transmitted from the plurality of coexistence control means as well as sending and receiving data between the coexistence control means Using a coexistence system having a first interface and a storage means for controlling a first timer and a second timer,
Identifying whether the storage means has received a new message from the coexistence control means or the timer has expired, and if none has been identified, an identification step for repeatedly executing the identification step;
In the identification step, if reception of a new message is identified, a determination step for determining whether the message is from an already authenticated coexistence control means;
In the determination step, if it is determined that the message is already authenticated coexistence control means, the first timer is activated, the second timer is stopped, and the counter is set to 0. Steps,
When receiving the CM registration request message from the coexistence control unit in the identification step, the storage unit that has identified the message updates the registration information of the coexistence control unit, and the coexistence control unit has jurisdiction. A processing operation execution step for updating registration information (hereinafter referred to as adjacent registration information) of other coexistence control means having jurisdiction over another wireless communication network adjacent to the wireless communication network ;
If at least the expiration of the first timer is identified in the identification step, a request signal is transmitted from the storage means to the coexistence control means, the second timer is reset, and the counter is incremented by one. The coexistence control means that has received the request signal has a timer control step A for transitioning to an active state, and
When the expiration of the second timer is identified in the identification step, if the counter is less than a predetermined value, the process proceeds to the timer control step A, and if the counter reaches the predetermined value, the processing operation Timer control step of deleting registration information of the coexistence control means already registered in the execution step and updating the registration information of the coexistence control means in the adjacent registration information in another adjacent wireless communication network B and
A communication coexistence method using a communication coexistence system, wherein after completing the processing operation execution step, the timer control step A, and the timer control step B, the process returns to the identification step. The storage means has a second interface for transmitting and receiving data to and from the TV White Space (TVWS) database,
2. The communication coexistence method according to claim 1, wherein the second interface is used to obtain effective channel information from at least the TVWS database. The communication coexistence method according to claim 2, wherein the first interface is used to provide effective channel information to the TVWS database.