JP2012227730A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication device capable of improving probability of possibility of proxy response without increasing storage capacity of a proxy response part.SOLUTION: An MFP 1 comprises a communication part 21 including: a normal response part 22 which responds to an SNMP request in a normal mode, and electrification of which is stopped in a sleep mode; a proxy response part 23 which performs proxy response in the case of receiving the SNMP request in the sleep mode; and a setting part 26 for making the proxy response part 23 store an object ID, which is hold by the SNMP request received in the normal mode, mapped to information responded by the normal response part 22, when it is determined that setting of the proxy response is performed. When receiving an SNMP request having the set object ID in the sleep mode, the proxy response part 23 performs the proxy response by using the stored information mapped to the object ID.

Description

  The present invention relates to a communication device that performs power-saving control of its own device.

  Conventionally, communication devices mounted on image forming apparatuses such as printers and multifunction peripherals are known. Among these communication apparatuses, there is an apparatus in which the image forming apparatus shifts to the sleep mode and shifts to the sleep mode to reduce power consumption. For example, Patent Document 1 below describes a communication device that is mounted on a printer and shifts to a sleep mode.

  Since the communication device described in Patent Document 1 is de-energized in the sleep mode, it cannot respond to an information acquisition request transmitted from the host computer. For this reason, the system described in the following Patent Document 1 includes a proxy server that responds on behalf of the communication device. This proxy server stores information about a plurality of printers connected to the network, and returns the stored information in response to an information acquisition request from the host computer.

JP 2008-165653 A

  In the system disclosed in Patent Document 1, a proxy server separate from the printer communication device is installed to perform a proxy response. On the other hand, it is conceivable that the communication device itself includes a proxy response unit that performs a proxy response in the sleep mode. In this case, the proxy response unit is required to consume less power than the normal response unit that responds in the normal mode. For this reason, it is preferable that the RAM mounted on the proxy response unit has a small capacity.

  Information acquisition requests that require proxy responses include SNMP (Simple Network Management Protocol) requests. SNMP is used by, for example, a personal computer (PC) to acquire information about a communication device such as a printer. In SNMP, an object ID is set for each requested information. Then, the PC transmits an SNMP request including the object ID to the communication device, and the communication device returns information corresponding to the object ID, so that the PC grasps the state of the communication device.

  The object ID varies depending on the SNMP manager software used. Therefore, a relatively large storage capacity is required for the proxy response unit to store sufficient information for all object IDs set for each SNMP manager software. Here, if the capacity of the RAM is reduced in order to suppress the power consumption of the proxy response unit, sufficient information may not be stored in the proxy response unit. When the proxy response unit receives an SNMP request for which proxy response is impossible, the proxy response unit returns itself to the normal mode, and the normal response unit responds. If a proxy response cannot be made in many cases with respect to the received SNMP request, the own device is frequently returned to the normal mode, and the power saving effect is reduced.

  Therefore, the present invention has been made to solve the above-described problems, and provides a communication device that can increase the probability of proxy response without increasing the storage capacity of the proxy response unit. Objective.

  A communication apparatus according to the present invention includes a power control unit that performs transition control of a power mode including a normal mode and a sleep mode, and a communication unit that performs transmission and reception of packets. When energization is stopped and an SNMP request is received in the normal mode, a normal response unit that returns a response packet including information corresponding to the object ID included in the SNMP request, and an SNMP request is received in the sleep mode. A proxy response is set for a proxy response unit that performs a proxy response, a storage unit that stores a list of object IDs for setting a proxy response as a setting candidate ID list, and an object ID included in the SNMP request received in the normal mode. A determination unit that determines whether to perform the determination based on the setting candidate ID list, and a determination unit In association with the object ID determined to set the response, the proxy response unit stores information that the normal response unit responds to the object ID, and sets the proxy response. When the SNMP request having the object ID set by the setting unit is received in the sleep mode, a proxy response is performed using information stored in association with the object ID.

  According to the communication device of the present invention, in the normal mode, when an SNMP request is received, a response packet is returned by the normal response unit. This response packet includes information corresponding to the object ID included in the SNMP request. On the other hand, for the object ID included in the SNMP request, whether to set a proxy response is determined based on the setting candidate ID list. When it is determined that the proxy response is to be performed, the information included in the response packet is stored in the proxy response unit in association with the object ID. Thereby, the object ID that performs the proxy response is set in the proxy response unit. When an SNMP request having the set object ID is received in the sleep mode, a response by the proxy response unit is performed using the information stored in association with the object ID. As described above, a proxy response can be made for the object ID that is actually responded in the normal mode. In general, there is a high probability that an object ID received in the normal mode is received even in the sleep mode. Therefore, the probability of performing a proxy response can be increased. On the other hand, since it is not necessary to store information on all object IDs set for each SNMP manager software, it is not necessary to increase the storage capacity of the proxy response unit. Therefore, it is possible to increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

  In the communication apparatus according to the present invention, it is preferable that the setting unit sets the proxy response in preference to the object ID newly responded by the normal response unit.

  According to this configuration, the object ID newly responded by the normal response unit is preferentially set as the object ID for performing the proxy response. Thereby, for example, when the storage capacity of the proxy response unit is insufficient, the object ID for which a new response has been made is set with priority over the old object ID. The newly responded object ID has a higher probability of being received in the next sleep mode than the old object ID. Therefore, it is possible to further increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

  In the communication device according to the present invention, the storage unit stores, as a priority ID list, a list of object IDs set with priority among the object IDs included in the setting candidate ID list, and the setting unit stores the priority ID list in the priority ID list. It is preferable to set the proxy response in preference to the included object ID.

  According to this configuration, the object ID included in the priority ID list is preferentially set as the object ID that makes a proxy response. Thereby, when the storage capacity of the proxy response unit is insufficient, the object ID included in the priority ID list can be set with priority over the object ID not included in the priority ID list. Therefore, it is possible to further increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

  The communication apparatus according to the present invention further includes a counting unit that counts the number of times received for each object ID, and the setting unit sets a proxy response in preference to an object ID that has a large number of counts by the counting unit. preferable.

  According to this configuration, the number of times of reception is counted for each object ID, and an object ID with a large number of counts is set as an object ID that preferentially makes a proxy response. For this reason, an object ID having a high probability of being actually requested can be set with priority. Therefore, it is possible to further increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

  According to the communication device of the present invention, it is possible to increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

1 is a block diagram illustrating a configuration of an MFP according to an embodiment. It is a flowchart which shows the setting process of a proxy response. It is a flowchart which shows a proxy response process. It is a block diagram which shows the structure of MFP which concerns on a modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. First, an MFP (Multifunction Peripheral) 1 equipped with a communication apparatus according to the embodiment will be described as an example with reference to FIG. FIG. 1 is a block diagram showing the configuration of the MFP 1.

  The MFP 1 is a multifunction device that performs image processing including printing, scanning, and FAX (facsimile). Further, the MFP 1 receives a job request transmitted from the personal computer (PC) 3 via a LAN (local area network) 90 and executes the above-described image processing.

  The MFP 1 performs power saving control of the own machine. When there is no job request for a predetermined time, the MFP 1 shifts from the normal mode to the sleep mode. In the sleep mode, energization is stopped except for the part that detects the arrival of a FAX and the part that performs a proxy response of a packet (proxy response unit 23). When a packet is received from the PC 3 in this sleep mode, if a proxy response is possible by the proxy response unit 23, a proxy response is performed. If the proxy response is impossible, the response is made after returning to the normal mode.

  Subsequently, each component constituting the MFP 1 will be described in order. The MFP 1 includes a printer 10, a scanner 11, an NCU (Network Control Unit) 12, a modem 13, a FAX control unit 14, a codec 15, and an image storage unit 16 in order to execute the above-described image processing.

  The printer 10 of this embodiment is a printer that performs printing by an electrophotographic method. The scanner 11 is constituted by a CCD or the like, and optically reads a document to generate image data. The NCU 12 is connected to the modem 13 and controls the connection between the modem 13 and the public telephone line (PSTN) 91. The FAX control unit 14 controls the NCU 12 and the modem 13 so that FAX transmission / reception is performed.

  The codec 15 encodes and compresses the image data generated by the scanner 11 and decodes the encoded and compressed image data. The image storage unit 16 stores image data encoded and compressed by the codec 15, FAX data, print data transmitted from the PC 3, and the like.

  The MFP 1 also includes an operation unit 17 and a display unit 18 in order to receive an operation from the user. The operation unit 17 includes various keys and receives various operations from the user. The display unit 18 includes a liquid crystal display, for example, and displays various types of information.

  The MFP 1 includes a control unit 19 for controlling the apparatus itself in an integrated manner. The control unit 19 physically includes a CPU, flash ROM, SDRAM, SRAM connected to a battery, and the like. Various programs are stored in the flash ROM. The SDRAM is used as a main memory. The SRAM connected to the battery stores speed dials, error information, various settings, and the like.

  The control unit 19 includes a power control unit 20 as a functional component. The power control unit 20 performs power mode shift control of the own device. When the user powers on the MFP 1, the MFP 1 first enters the normal mode. The normal mode is a state in which power is supplied to all the components. When there is no operation from the user for a certain time or longer, the power control unit 20 shifts the power mode from the normal mode to the sleep mode.

  In the sleep mode, the power control unit 20 stops energization of the components except for a part of the NCU 12 and the proxy response unit 23. The reason why power is supplied to a part of the NCU 12 is to detect an incoming fax. When the NCU 12 detects an incoming fax in the sleep mode, the NCU 12 outputs an activation signal. The proxy response unit 23 outputs an activation signal when a request packet that cannot be responded is received in the sleep mode. When the activation signal is output from the NCU 12 or the proxy response unit 23 in the sleep mode, the power control unit 20 starts energizing all the components and returns the power mode to the normal mode.

  The communication unit 21 included in the MFP 1 functions as a network interface that transmits and receives packets via the LAN 90. The communication unit 21 includes, as functional components, a normal response unit 22 that transmits and receives packets in the normal mode, and a proxy response unit 23 that performs a proxy response in the sleep mode. Furthermore, the communication unit 21 includes a storage unit 24, a determination unit 25, and a setting unit 26 as functional components for setting a proxy response.

  The communication unit 21 physically includes two chips: a chip that exhibits the functions of the normal response unit 22, the storage unit 24, the determination unit 25, and the setting unit 26, and a chip that performs the function of the proxy response unit 23. It is comprised including. Each chip has a CPU for performing calculations, a ROM for storing programs, a RAM for storing various data, and the like.

  In the normal mode, power is supplied to the chip having the function of the normal response unit 22, and the functions of the normal response unit 22, the storage unit 24, the determination unit 25, and the setting unit 26 are exhibited. In the sleep mode, power supply to the chip having the function of the normal response unit 22 is stopped. The chip having the function of the proxy response unit 23 is supplied with power even in the sleep mode and exhibits the proxy response function.

  Each component of the communication unit 21 will be described in detail. The normal response unit 22 functions as a network interface that transmits and receives packets via the LAN 90 in the normal mode. In addition, the normal response unit 22 exhibits the IFAX function by performing transmission / reception of an electronic mail attached with image data. Further, the normal response unit 22 accepts an operation from the user performed via the PC 3.

  The packet transmitted and received by the communication unit 21 includes an SNMP (Simple Network Management Protocol) packet. The SNMP packet is used, for example, for the PC 3 to acquire information on the MFP 1. The information of the MFP 1 includes job accumulation status, presence / absence of paper in the paper cassette, information on presence / absence of toner, and the like.

  In SNMP, an object ID is set for each requested information. The PC 3 transmits an SNMP request including the object ID to the MFP 1, and the MFP 1 returns information corresponding to the object ID, whereby the PC 3 can grasp the state of the MFP 1. There are a plurality of SNMP manager software, and an object ID is set for each SNMP manager software and for each requested information.

  In the normal mode, when the normal response unit 22 receives an SNMP request, it returns a response packet including information corresponding to the object ID included in the SNMP request. More specifically, the normal response unit 22 analyzes the received SNMP request and grasps information corresponding to the object ID set for each SNMP manager software. Then, the normal response unit 22 acquires information corresponding to the received object ID, for example, from the main control unit 19, generates a response packet including the acquired information, and returns the response packet.

  In the sleep mode, the energization of the normal response unit 22 is stopped, so that the normal response unit 22 cannot make a packet response. For this reason, in the sleep mode, the proxy response unit 23 makes a proxy response for the SNMP packet. The proxy response unit 23 includes a CPU, ROM, and RAM having relatively low specifications in order to reduce power consumption and cost. For this reason, the communication function of the proxy response unit 23 is restricted by the normal response unit 22.

  In particular, since the capacity of the RAM is small, the proxy response unit 23 cannot store all information necessary for performing a response for all object IDs set for each of a plurality of SNMP manager softwares. For this reason, the proxy response is set so that the proxy response unit 23 can perform the proxy response in the sleep mode for the object ID for which the response by the normal response unit 22 has been performed in the normal mode. The memory | storage part 24, the determination part 25, and the setting part 26 for setting this proxy response are demonstrated.

  The storage unit 24 stores a list of setting candidate IDs. This setting candidate ID list is a list of object IDs for setting proxy responses. That is, the setting candidate ID list is a list of object IDs for which proxy response is possible by setting in the proxy response unit 23. This list of setting candidate IDs is stored in the storage unit 24 in advance.

  When an SNMP request is received in the normal mode, the determination unit 25 determines whether to set a proxy response for the object ID included in the SNMP request based on the setting candidate ID list. If the received object ID is included in the setting candidate ID list, the determination unit 25 determines to set a proxy response. On the other hand, if the received object ID is not included in the setting candidate ID list, the determination unit 25 determines that the proxy response is not set.

  The setting unit 26 sets the object ID determined to set the proxy response in the proxy response unit 23. Specifically, the setting unit 26 associates the header information of the SNMP request determined to set the proxy response with the information responded by the normal response unit 22 and stores the information in the proxy response unit 23. The SNMP request header information includes information indicating that the packet is an SNMP request, an object ID, and the like.

  The setting unit 26 sets the object ID in the proxy response unit 23 in the order in which the SNMP requests are received in the normal mode. When the proxy response unit 23 runs out of free space, the newly responded object ID is preferentially set. That is, when the proxy response unit 23 runs out of free space, the setting unit 23 deletes the setting of the oldest object ID from the proxy response unit 23 and sets an object ID for which a new response has been made.

  The proxy response unit 23 according to the present embodiment may be set to perform a proxy response for the ICMP request and the ARP request. The ICMP request is a packet for requesting a response from the other party in order to confirm the connection status by ICMP (Internet Control Message Protocol). The ARP request is a packet for requesting a response for inquiring about the MAC address by ARP (Address Resolution Protocol). Also for the ICMP request and the ARP request, the proxy response unit 23 stores respective header information. The proxy response unit 23 stores information to be responded in association with the header information.

  When the proxy response unit 23 receives a packet in the sleep mode, the proxy response unit 23 compares the header of the received packet with the set header information and determines whether or not they match. When the proxy response unit 23 matches the header information of the SNMP request, the proxy response unit 23 generates and returns a response packet including information stored in association with the header information. That is, when the proxy response unit 23 receives an SNMP request including the set object ID, the proxy response unit 23 performs a proxy response using information stored in association with the object ID.

  The proxy response unit 23 returns a response packet including information stored in association with the packet that matches the header information of the set ICMP request or ARP request. As described above, the proxy response unit 23 determines that a proxy response is possible for a packet that matches the set header information, and performs a proxy response using the information stored in association with the packet.

  On the other hand, the proxy response unit 23 determines that a proxy response is not possible for a packet that does not match the set header information, and outputs an activation signal. As a result, the MFP 1 returns to the normal mode, and the normal response unit 22 responds. Since the proxy response unit 23 is not set with a proxy response for a job request such as image processing, the proxy response unit 23 outputs an activation signal when receiving the job request. In this case, after the MFP 1 returns to the normal mode, the normal response unit 22 responds and the requested image processing is performed.

  Subsequently, the operation of the MFP 1 will be described. First, a process for setting a proxy response in the normal mode will be described with reference to FIG. FIG. 2 is a flowchart showing a proxy response setting process. This process is performed when an SNMP request is received from the LAN 90 in the normal mode.

  First, when an SNMP request is received in step S101, the process proceeds to step S102. In step S102, it is determined whether or not to set a proxy response for the object ID included in the received SNMP request. When the object ID included in the SNMP request is not included in the setting candidate ID list, it is determined that the proxy response is not set. In this case, the process ends without setting a proxy response.

  On the other hand, when the object ID included in the received SNMP request is included in the setting candidate ID list, it is determined that the proxy response is set, and the process proceeds to step S103. In step S103, a proxy response is set for the object ID included in the received SNMP request. That is, the object ID and the information that the normal response unit 22 responds to the object ID are associated and stored in the proxy response unit 23.

  In step S103, when the setting unit 26 determines that there is not enough free space in the proxy response unit 23, the setting of the oldest object ID is deleted, and the object ID received in step S101 is set. Accordingly, the object ID for which a response has been newly made can be prioritized and set as the object ID for which a proxy response is made. Further, when the proxy response is already set for the same object ID, the old setting may be deleted and the object ID may be stored in the proxy response unit 23 in association with the new information. Thereby, information corresponding to the object ID can be updated.

  Next, proxy response processing by the proxy response unit 23 will be described with reference to FIG. FIG. 3 is a flowchart showing proxy response processing. This process is performed when a packet is received from the LAN 90 in the sleep mode.

  First, when a packet is received in step S111, the process proceeds to step S112. In step S112, it is determined whether a proxy response is possible for the received packet. This is determined based on whether header information that matches the header information of the received packet is stored among the header information set in the proxy response unit 23.

  If it is determined that a proxy response is impossible, the process proceeds to step S113. In step S113, an activation signal is output, and MFP 1 returns to the normal mode. Subsequently, in step S114, a response to the packet received in step S111 is performed by the normal response unit 22.

  On the other hand, when it is determined in step S112 that a proxy response is possible, the process proceeds to step S115. In step S115, if the header information that matches the header of the packet received in step S111 is the header information of the SNMP request, the information stored in association with the received object ID is specified. Then, a response packet including the information is returned by the proxy response unit 23.

  In step S115, when the header information that matches the header of the packet received in step S111 is the header information of the ICMP request or the ARP request, the response packet including the information stored in association with the header information is the proxy response unit 23. Will be replied by. As described above, in step S115, a proxy response is made without returning the MFP 1 to the normal mode.

  According to the MFP 1 according to the present embodiment described above, when an SNMP request is received in the normal mode, whether to set a proxy response for the object ID included in the SNMP request is displayed in the setting candidate ID list. Based on the determination. When it is determined to set the proxy response, the object ID is set in the proxy response unit 23. When an SNMP request including the set object ID is received in the sleep mode, a response by the proxy response unit 23 is performed using information stored in association with the object ID. As described above, a proxy response can be made for the object ID that is actually responded in the normal mode. In general, there is a high probability that an object ID received in the normal mode is received even in the sleep mode. Therefore, the probability of performing a proxy response can be increased. On the other hand, since it is not necessary to store information on all object IDs set for each SNMP manager software, it is not necessary to increase the storage capacity of the proxy response unit. Therefore, it is possible to increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

  In the MFP 1, the object ID newly responded by the normal response unit 22 is set with priority. For this reason, it is possible to automatically update the setting of the object ID for performing the proxy response according to the latest situation. Then, the newly responded object ID has a higher probability of being received in the next sleep mode than the old object ID. Therefore, it is possible to further increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, when the storage capacity of the proxy response unit 23 is insufficient, the object ID for which a new response has been made is preferentially set, but the present invention is not limited to this. In addition, two modified examples in which the proxy response is set in consideration of the priority will be described.

  In the first modification, an object ID set with priority is stored in advance, and the object ID is set with priority. In this case, the storage unit 24 stores in advance, as a priority ID list, a list of object IDs set with priority among the object IDs included in the setting candidate ID list. When the storage capacity of the proxy response unit 23 is insufficient, the setting unit 26 determines whether the received object ID is included in the priority ID list.

  When the received object ID is included in the priority ID list, the setting unit 26 deletes the setting of the object ID not included in the priority ID list among the already set object IDs, and receives the received object ID. The ID is set in the proxy response unit 23. If the received object ID is not included in the priority ID list, the setting unit 26 does not newly set the received object ID. As described above, the object ID included in the priority ID list is prioritized and set as the object ID for the proxy response.

  According to the configuration according to the first modification, when the storage capacity of the proxy response unit 23 is insufficient, the objects included in the priority ID list are set by setting object IDs not included in the priority ID list. The ID can be set with priority. Therefore, by including an object ID with a high reception frequency in the priority ID list, an object ID with a high reception frequency is set with priority. Therefore, it is possible to further increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

  In the second modification, the number of times of reception for each object ID is counted, and an object ID with a large count number is set with priority. In this case, as shown in FIG. 4, the MFP 1A according to the second modification includes a communication unit 21A. 21 A of communication parts are further provided with the count part 27 which counts the frequency | count received for every object ID in addition to the component of the communication part 21 mentioned above. The function of the count unit 27 is mounted on a chip having the function of the normal response unit 22, for example.

  The count unit 27 counts the number of times received for each object ID in the normal mode. The storage unit 24 stores the count number by the count unit 27 for each object ID. When the storage capacity of the proxy response unit 23 is insufficient, the setting unit 26 counts the newly received object ID count and the object ID with the smallest count number among the object IDs already set in the proxy response unit 23. Compare the count.

  Then, when the count number of the newly received object ID is larger, the setting unit 26 deletes the set object ID having the smallest count number and sets the newly received object ID. On the other hand, when the count number of the newly received object ID is smaller, the setting unit 26 does not set the object ID. Through the above processing, the setting unit 26 sets a proxy response with priority given to an object ID having a large number of counts. Therefore, an object ID having a high probability of actually requesting a response can be set with priority. Therefore, it is possible to further increase the probability that a proxy response is possible without increasing the storage capacity of the proxy response unit.

  The present invention is not limited to the above-described modified examples, and further modifications are possible. For example, in the above embodiment, an MFP having a plurality of image processing functions has been described as an apparatus equipped with the communication apparatus of the present invention. However, a single-function printer or the like may be used, and an image processing function may be provided. It does not have to be. Moreover, in the said embodiment, although the normal response part 22, the memory | storage part 24, the determination part 25, and the setting part 26 were comprised with 1 chip | tip, you may comprise with a several chip | tip.

1 MFP
10 Printer 11 Scanner 12 NCU
DESCRIPTION OF SYMBOLS 13 Modem 14 FAX control part 19 Main control part 20 Power control part 21 Communication part 22 Normal response part 23 Proxy response part 24 Memory | storage part 25 Judgment part 26 Setting part 27 Count part

Claims (4)

A power control unit that performs transition control of a power mode including a normal mode and a sleep mode;
A communication unit for transmitting and receiving packets,
The communication unit is
In the sleep mode, energization is stopped by the power control unit, and in the normal mode, when an SNMP request is received, a normal response unit that returns a response packet including information corresponding to the object ID included in the SNMP request;
In the sleep mode, when an SNMP request is received, a proxy response unit that performs a proxy response;
A storage unit that stores a list of object IDs for setting proxy responses as a list of setting candidate IDs;
A determination unit that determines whether to set a proxy response for the object ID included in the SNMP request received in the normal mode based on the setting candidate ID list;
A setting unit that associates with the object ID determined to set the proxy response by the determination unit, stores the information that the normal response unit responded to the object ID in the proxy response unit, and sets the proxy response When,
Including
The proxy response unit performs a proxy response using the information stored in association with the object ID when the SNMP request having the object ID set by the setting unit is received in the sleep mode. A communication device.   The communication apparatus according to claim 1, wherein the setting unit sets a proxy response by giving priority to an object ID newly responded by the normal response unit. The storage unit stores, as a priority ID list, a list of object IDs preferentially set among object IDs included in the setting candidate ID list,
The communication apparatus according to claim 1, wherein the setting unit sets a proxy response in preference to an object ID included in the priority ID list. For each object ID, it further comprises a counting unit that counts the number of times received.
The communication device according to claim 1, wherein the setting unit preferentially sets an object ID having a large number of counts by the counting unit and sets a proxy response.

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