Communication Equipment

Abstract

To extend the operating time of a battery while maintaining a communication function.SOLUTION: A communication device includes: a power supply switching unit 4 that switches between a commercial power supply 110 and a secondary battery 1; and a control unit 50 that controls the power supply switching unit 4 and switches modes of the communication device. When a charging rate is classified into three stages of "high," "medium," and "low," the control unit 50 does not limit a communication function when the charging rate is high, limits speed of the communication function when the charging rate is medium, and stops the communication function when the charging rate is low.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a communication device, for example a home gateway. [Background technology]

[0002] Patent Document 1 discloses a portable wireless telephone device that uses a battery. Patent Document 2 discloses a portable device that stops the supply of current to an IC card and limits the functions of an application that uses this depending on the remaining battery level or voltage. Patent Document 3 discloses a portable information terminal that reduces battery consumption by changing the communication connection mode with an external device depending on the remaining battery level. Note that the connection modes include a constant connection mode that is constantly connected to an external device, a pre-connection mode that connects in advance when a predetermined connection point is reached and disconnects after communication, and a connection-per-connection mode that connects and disconnects each time communication is performed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3057860 [Patent Document 2] Japanese Patent Application Publication No. 7-141069 [Patent Document 3] JP 2011-103565 A (claims 1 and 3) Summary of the Invention [Problem to be solved by the invention]

[0004] In the event of an emergency in which a main power source such as a commercial power source is lost, a communication device that is powered by a battery is required. As a means of communication in an emergency, such a communication device needs to be able to operate and communicate for as long as possible. However, there is a problem in that extending the operating time increases the cost of batteries (primary batteries, secondary batteries) that are not normally used.

[0005] One possible method for solving this problem is to reduce battery consumption by applying the technology of Patent Document 3 for battery operation in an emergency. However, the technology described in Patent Document 3 is a technology for cutting off connections with external devices, which poses the problem of cutting off communication functions.

[0006] The present invention has been made to solve such problems, and has an object to provide a communication device that can extend the operating time of a battery while maintaining a communication function. [Means for solving the problem]

[0007] In order to achieve the above object, the communication device of the present invention includes a power source switching unit that switches between a commercial power source and a battery (e.g., a primary battery or a secondary battery), and a control unit that controls the power source switching unit and switches the mode of the communication device. A learning unit that learns communication power consumption according to time of day; The control unit is configured to determine the remaining battery capacity of the battery (e.g., the corresponding charging rate) The stage of dividing Depending on the situation, communication functions may be restricted. During a time period when the communication power consumption learned by the learning unit is low, a communication unit having a high communication power consumption is stopped from functioning. The reference characters and letters in parentheses are used in the embodiments and do not limit the present invention. Effect of the Invention

[0008] According to the present invention, it is possible to extend the operating time of the battery while maintaining the communication function. [Brief description of the drawings]

[0009] [Figure 1] 1 is a configuration diagram of a communication system according to a first embodiment of the present invention. [Diagram 2] 1 is a configuration diagram of a communication device according to a first embodiment of the present invention. [Diagram 3] 4 is a flowchart illustrating an operation of the communication device according to the first embodiment of the present invention. [Figure 4] 4 is a flowchart illustrating power supply power control of the communication device according to the first embodiment of the present invention. [Diagram 5]10 is a flowchart illustrating an operation of a communication device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that each drawing is merely a schematic view to allow a sufficient understanding of the embodiment. In addition, in each drawing, common or similar components are given the same reference numerals, and duplicated explanations thereof will be omitted.

[0011] (First embodiment) FIG. 1 is a configuration diagram of a communication system according to a first embodiment of the present invention. The communication system 200 includes a communication device 100, a telephone 120, and a PC (Personal Computer) 130. The communication device 100 includes a secondary battery 1 therein and is connected to a commercial power source 110. This allows communication to be maintained using the secondary battery 1 even when the commercial power source 110 experiences a power outage.

[0012] The communication device 100 is a home gateway, and mainly includes a wireless LAN (Local Area Network) unit 31, a wired LAN port 41, a telephone port 42, and a WAN port 44. The WAN port 44 is connected to a WAN (Wide Area Network) by wireless communication with a base station of a mobile phone company. The wireless LAN unit 31 realizes the communication function of the wireless LAN. That is, the WAN port 44 and the WAN communication unit 34 function as a long-distance wireless communication unit, and the wireless LAN unit 31 functions as a short-distance wireless communication unit. The wired LAN port 41 is connected to, for example, a PC (Personal Computer) 130 or a communication terminal via the wired LAN. The telephone port 42 is connected to a telephone 120. The telephone port 42 is also called a TEL port.

[0013] FIG. 2 is a configuration diagram of a communication device 100 according to a first embodiment of the present invention. The communication device 100 includes a secondary battery 1, a power outage detection unit 2, an AC-DC power supply unit 3, a power supply switching unit 4, a charging rate measuring circuit 10, a power supply circuit unit 20, a communication circuit unit 30, an external interface unit 40, and a control unit 50.

[0014] The secondary battery 1 is a rechargeable battery, and is charged by the DC output voltage of the AC-DC power supply unit 3. The remaining battery capacity (remaining charge RC) based on the battery capacity FCC (full charge capacity) is called the state of charge (SOC). In other words, SOC = RC [Ah] / FCC [Ah].

[0015] The power failure detection unit 2 detects a power failure state of the commercial power supply 110. The AC-DC power supply unit 3 is a switching power supply that steps down the AC voltage of the commercial power supply 110 to a DC voltage. The power supply switching unit 4 is an electronic switch that switches between the output voltage of the AC-DC power supply unit 3 and the output voltage of the secondary battery 1 based on the detection result of the power failure detection unit 2, and supplies power to the power supply circuit unit 20.

[0016] The charging rate measuring circuit 10 includes a voltage measuring circuit 11, and successively measures the open circuit voltage to estimate the remaining battery capacity of the secondary battery 1 (the charging rate SOC in the case of the secondary battery 1), but may also measure the load voltage when a load is connected. The charging rate measuring circuit 10 also includes a temperature measuring circuit 12, and measures the environmental temperature [°C] of the secondary battery 1 to correct the temperature characteristics of the charging rate SOC.

[0017] The communication circuit unit 30 is a hardware resource including a wireless LAN unit 31, a wired LAN unit 32, a telephone line unit 33, and a WAN communication unit 34. The external interface unit 40 includes a wired LAN port 41, a telephone port 42, and a WAN port 44.

[0018] The wireless LAN unit 31 realizes the communication function of a wireless LAN. The wired LAN unit 32 realizes the communication function of a wired LAN via a wired LAN port 41. The telephone line unit 33 realizes the communication function of a telephone 120 (FIG. 1) via a telephone port .

[0019] The wired LAN unit 32 can set a communication speed of, for example, 10 Mbps / 100 Mbps / 1 Gbps, and the faster the communication speed is set, the more power consumption it consumes. This allows the control unit 50 to switch the speed setting to reduce power consumption.

[0020] The WAN communication unit 34 realizes a function of performing wireless communication with a base station of a mobile phone company via the WAN port 44. Specifically, the combination of the WAN communication unit 34 and the WAN port 44 performs communication via the wireless LAN unit 31, the wired LAN unit 32, and the telephone line unit 33.

[0021] The power supply circuit unit 20 includes three power supply units 21, 22, and 24, and a power consumption measuring unit 25. The power supply unit 21 is a switch that supplies or cuts off the output power of the power supply switching unit 4 to the wireless LAN unit 31 under the control of the control unit 50. The power supply unit 22 is a switch that supplies or cuts off the output power of the power supply switching unit 4 to the wired LAN unit 32 under the control of the control unit 50. The power supply unit 24 supplies the output power of the power supply switching unit 4 to the telephone line unit 33 and the WAN communication unit 34. In other words, the telephone line unit 33 and the WAN communication unit 34 are constantly supplied with power.

[0022] The power consumption measuring unit 25 sequentially measures the power supplied to each of the wireless LAN unit 31, the wired LAN unit 32, the telephone line unit 33, and the WAN communication unit 34. Note that the power consumption measuring unit 25 may obtain the power consumption by measuring the current consumed by each of the wireless LAN unit 31, the wired LAN unit 32, the telephone line unit 33, and the WAN communication unit 34.

[0023] The control unit 50 is composed of a CPU (Central Processing Unit) and a storage unit (not shown), and realizes the functions of a power supply control unit 51, a communication control unit 52, and a recording unit 53 by executing a program. The power supply control unit 51 controls the power supply units 21 and 22 according to the remaining battery level (charging rate SOC) of the secondary battery 1, and gradually limits the communication function. For example, when the charging rate SOC is high (e.g., 70% to 100%), the power supply control unit 51 does not limit the function of the communication circuit unit 30, and when the charging rate SOC is low (e.g., 0% to 30%), the power supply control unit 51 stops either or both of the wireless LAN unit 31 and the wired LAN unit 32. When the charging rate SOC is medium (e.g., 30% to 70%), the communication control unit 52 limits the speed of either or both of the wireless LAN unit 31 and the wired LAN unit 32. In addition, the power supply switching unit 4 switches between the commercial power supply 110 and the secondary battery 1 based on the detection result of the power outage detection unit 2, but the power supply control unit 51 may also cause the power supply switching unit 4 to switch from the commercial power supply 110 to the secondary battery 1 based on the detection result of the power outage detection unit 2.

[0024] Furthermore, the power supply control unit 51 causes the power consumption measurement unit 25 to measure the power consumption of the wireless LAN unit 31, the power consumption of the wired LAN unit 32, and the power consumption of the telephone line unit 33 from before the power outage.

[0025] Furthermore, the communication control unit 52 does not limit the communication speed when driven by the commercial power supply 110. When driven by the secondary battery 1, the communication control unit 52 does not limit the communication speed in principle during time periods when power consumption is high (for example, from 8 p.m. to 11 p.m., when communication using wired LAN is the norm). Furthermore, the power supply control unit 51 cuts off the power supply to the wireless LAN unit 31 and the wired LAN unit 32 in time periods when power consumption is low (for example, from 11 p.m. to 6 a.m. the following morning). As an exception, the communication control unit 52 limits the communication speed of either or both of the wireless LAN unit 31 and the wired LAN unit 32 based on the charging rate SOC of the secondary battery 1.

[0026] At this time, the power supply control unit 51 restricts the functions of the communication circuit unit 30 in stages. In a first stage (e.g., 70% to 100%) where the charging rate SOC of the secondary battery 1 is high, no functional restriction is imposed on the communication circuit unit 30. In a second stage (e.g., 30% to 70%), the communication control unit 52 restricts the communication speed of either or both of the wireless LAN unit 31 and the wired LAN unit 32. Then, in a third stage (e.g., 0% to 30%) where the charging rate SOC of the secondary battery 1 is low, the power supply control unit 51 performs control that prioritizes the telephone line unit 33. These controls can extend the operating time of the secondary battery 1.

[0027] The communication control unit 52 controls the wireless LAN unit 31, the wired LAN unit 32, the telephone line unit 33, and the WAN communication unit .

[0028] Furthermore, the communication control unit 52 limits the speed of either or both of the wireless LAN unit 31 and the wired LAN unit 32. Table 1 shows the relationship between the CPU clock, the speed setting of the wired LAN unit 32, and the communication speed of the wired LAN unit 32. Note that these numerical values ​​are merely examples, and the values ​​differ depending on the CPU and communication device.

[0029] [Table 1]

[0030] For example, when the control unit 50 has a CPU clock of 500 MHz, and speed settings of 1 Gbps, 100 Mbps, and 10 Mbps are used to ensure a throughput (instantaneous communication speed), the wired LAN unit 32 can be operated at 1 Gbps.

[0031] However, when the control unit 50 is set to a 400 MHz CPU clock and a 100 Mbps speed, if a throughput of 100 MHz can be ensured, even if the wired LAN unit 32 is operated at a 1 Gbps speed setting, the communication speed will be limited to less than 1 Gbps due to the throughput of the control unit 50. Note that even with a 400 MHz CPU clock, when the speed settings are 100 Mbps and 10 Mbps, communication speeds of 100 Mbps and 10 Mbps can be obtained.

[0032] Therefore, when reducing power consumption, the speed setting of the wired LAN unit 32 can be lowered to 100 Mbps to reduce power consumption. In other words, power consumption can be reduced by simply changing the communication speed of the wired LAN unit 32 without lowering the CPU clock. Furthermore, power consumption can be further reduced by lowering the CPU clock of the control unit 50 from 500 MHz to 400 MHz.

[0033] The recording unit 53 records in a non-volatile storage unit (not shown) the learning result of learning the time periods with high communication power consumption based on the power consumption (or current consumption) of the wireless LAN unit 31, the wired LAN unit 32, and the telephone line unit 33 measured by the power consumption measuring unit 25, including before the power outage. After the power outage, the recording unit 53 records not only the power consumption of each unit but also the charging rate SOC of the secondary battery 1 together with the elapsed time.

[0034] FIG. 3 is a flowchart for explaining the operation of the communication device according to the first embodiment of the present invention. When the power switch (not shown) is turned on, the device starts up (S1), and the power supply control unit 51 (FIG. 2) determines whether the device is operating on the secondary battery 1 (S2). At this time, the power supply control unit 51 determines whether the power outage detection unit 2 has detected a power outage and the power supply switching unit 4 has switched to the secondary battery 1. If the secondary battery 1 is not operating (No), the power supply control unit 51 waits until the secondary battery 1 operates. In other words, the power supply control unit 51 waits while receiving power from the commercial power source 110.

[0035] On the other hand, if the secondary battery 1 is operating (Yes), the power supply control unit 51 reads out the communication power consumption during the execution time period from the recording unit (S3). As a result, the total power consumption consumed by the wireless LAN unit 31, the wired LAN unit 32, and the telephone line unit 33 is read out. After the process of S3, the power supply control unit 51 controls the power supply units 21 and 22 (FIG. 2) (S10a). That is, the power supply control unit 51 supplies or cuts off power to any one or a combination of the wireless LAN unit 31, the wired LAN unit 32, and the telephone line unit 33. The control unit 50 also changes the communication speed settings of either or both of the wireless LAN unit 31 and the wired LAN unit 32.

[0036] FIG. 4 is a flowchart for explaining the power supply control of the communication device according to the first embodiment of the present invention. In step S10a of the flowchart, it is determined whether the communication power consumption is high according to the time period (S11). In a time period (e.g., 8:00 p.m. to 11:00 p.m.) in which the communication power consumption is higher than a predetermined value ("high" in S11), the power supply control unit 51 determines whether the charging rate SOC is high or low (S12). When the charging rate SOC is higher than a first reference value (e.g., 70%) (e.g., 70% to 100%) ("very high" in S12), the control unit 50 does not limit the communication speed (S13).

[0037] When the charging rate SOC is between a second reference value (e.g., 50%) lower than the first reference value and the first reference value (e.g., 50% to 70%) ("high" in S12), the control unit 50 limits the communication speed of the wireless LAN unit 31 (S14). When the charging rate SOC is between a third reference value (e.g., 30%) lower than the second reference value (e.g., 50%) and the second reference value ("low" in S12), the control unit 50 disconnects the wireless LAN unit 31 and limits the communication speed of the wired LAN unit 32 (S15). When the charging rate SOC is lower than the third reference value (e.g., 30%) (e.g., 0% to 30%) ("very low" in S12), the control unit 50 disconnects the wireless LAN unit 31 and the wired LAN unit 32.

[0038] On the other hand, in a time period when communication power consumption is low (for example, 11pm to 6am the next morning) ("low" in S11), the power supply control unit 51 judges whether the charging rate SOC is high or low (S17). When the charging rate SOC is lower than a fourth reference value (for example, 50%) (for example, 0% to 50%) ("low" in S17), the control unit 50 disconnects the wireless LAN unit 31 and the wired LAN unit 32 (S16). On the other hand, when the charging rate SOC is higher than a fourth reference value (for example, 50%) (for example, 50% to 100%) ("high" in S17), the control unit 50 disconnects the wireless LAN unit 31 and limits the communication speed of the wired LAN unit 32 (S18). Then, after the processes of S14, S15, S16, and S18, the process returns to the original flow (FIG. 3).

[0039] 3, the power supply control unit 51 determines whether or not to proceed to the next control (S4a). For example, the power supply control unit 51 determines whether or not the communication power consumption has changed due to the elapsed time (change in time zone) since the operation of the secondary battery 1 was confirmed in S2. If there is no need to proceed to the next control (No), the power supply control unit 51 executes the control of S10a until it becomes necessary to proceed to the next control.

[0040] When it becomes necessary to proceed to the next control (Yes in S4a), the power supply control unit 51 records the charging rate SOC and the power consumption together with the time (S5a). After the process of S5a, the power supply control unit 51 executes the next control (S10b). In this control (S10b), it is determined whether or not the communication power consumption according to the new time period is high (S11 (FIG. 4)), and the power supply and communication speed are controlled according to the result of this determination.

[0041] Furthermore, the power supply control unit 51 learns the communication power consumption (or current consumption) and time (S20) by repeating a combination (see dashed line) of control (S10b), a decision on whether to proceed to the next control (S4b), and recording the charging rate SOC and power consumption (S5b).

[0042] As described above, according to the communication system 200 (FIG. 1) of the present embodiment, in the event of an emergency caused by a power outage, the power source is switched from the commercial power source 110 to the secondary battery 1. Before switching to the secondary battery 1, the communication power consumption according to the time period is determined by learning (S11). In the time period when communication power consumption is high (e.g., 8 p.m. to 11 p.m.), when the charging rate SOC is high (e.g., 70% to 100%), the communication device 100 does not limit the communication speed of the wireless LAN unit 31 and the wired LAN unit 32. However, when the charging rate SOC is low (e.g., 0% to 30%), the communication device 100 cuts off the power supply of the wireless LAN unit 31 and the wired LAN unit 32, and allows only the telephone line unit 33 to function. Note that when the charging rate SOC is intermediate (e.g., 30% to 70%), the communication device 100 limits the communication speed of either or both of the wireless LAN unit 31 and the wired LAN unit 32.

[0043] On the other hand, during times when communication power consumption is low (e.g., 11pm to 6am the next morning), if the charging rate SOC is high (e.g., 50% to 100%), the communication device 100 disconnects the wireless LAN unit 31 and limits the communication speed of the wired LAN unit 32, but if the charging rate SOC is low (e.g., 0% to 50%), it cuts off the power supply to the wireless LAN unit 31 and the wired LAN unit 32. Through these processes, the power consumption of the communication circuit unit 30 is reduced stepwise, and the operating time of the secondary battery 1 is extended.

[0044] This extends the operating time of the secondary battery 1, thereby reducing the capacity of the secondary battery 1. As a result, it is possible to reduce the cost of the communication device 100. Even when the power supply to the wireless LAN unit 31 and the wired LAN unit 32 is cut off, the telephone line unit 33 will start up as long as the secondary battery 1 is not depleted, so communication between the telephone set 120 (FIG. 1) and the WAN (FIG. 1) will be possible.

[0045] Second embodiment In the first embodiment, the power consumption of the communication circuit unit 30 was measured and recorded even after the secondary battery 1 was operating, but it is also possible to measure and record the power consumption of the communication circuit unit 30 only when the secondary battery 1 is not operating and the communication circuit unit 30 is operating on commercial power source 110.

[0046] FIG. 5 is a flowchart for explaining the operation of the communication device according to the second embodiment of the present invention. When a power switch (not shown) is turned on, the device starts up (S1), and the power supply control unit 51 (FIG. 2) determines whether power is being supplied from the commercial power supply 110 or from the secondary battery 1 (S32). When power is being supplied from the commercial power supply 110 ("commercial power supply" in S32), the power supply control unit 51 measures the power consumption of the communication circuit unit 30 (S33). After the process of S33, the power supply control unit 51 stores the measured power consumption in the recording unit 53 (FIG. 2) (S34), and repeats the determination of S32.

[0047] On the other hand, when power is being supplied from the secondary battery 1 ("Secondary battery" in S32), the power supply control unit 51 reads out the history of communication power consumption from the recording unit 53 (S35). After processing S35, the power supply control unit 51 causes the charging rate measurement circuit 10 (FIG. 2) to measure the charging rate of the secondary battery 1 (S36). After processing S36, the power supply control unit 51 executes source power control (FIG. 4) (S10) and repeats the determination of S32.

[0048] (Modification) The present invention is not limited to the above-described embodiment, and various modifications are possible, for example, as follows. (1) In the above embodiments, a secondary battery 1 is used, but a primary battery may be used. In the above embodiments, the charging rate SOC of the secondary battery 1 is estimated and used to estimate the remaining battery capacity, but in the case of a primary battery, the remaining battery capacity (remaining charge) is estimated. (2) In each of the above embodiments, power consumption is reduced by changing the communication speed setting of the communication circuit unit 30 or by lowering the CPU clock of the control unit 50. However, power consumption can also be reduced by lowering the power supply voltage.

[0049] (3) The recording unit 53 may learn the state of the secondary battery 1 from the history data and determine thresholds for controlling the power supply circuit unit 20 and the communication circuit unit 30 (for example, time period or charging rate SOC).

[0050] (4) In FIG. 4 of each embodiment, when the charging rate SOC is high, the communication speed of the wireless LAN is limited, but the operation may be reversed depending on the usage rate of the wireless LAN / wired LAN. For example, if only the wireless LAN is used and the wired LAN has not been used, the wired LAN may be disconnected first. Also, if both the wireless LAN and the wired LAN are used, the speed of both may be reduced.

[0051] (5) In each of the above embodiments, the WAN communication unit 34 functions as a long-distance wireless communication unit to wirelessly communicate with a mobile phone company's base station, but it may also be connected to a WAN via an ONU (Optical Network Unit), a router, etc. [Explanation of symbols]

[0052] 1 Secondary battery 4 Power supply switching section 10 Charging rate measurement circuit 20 Power supply circuit section 21,22,24 Power supply section 25 Power consumption measurement section 30 Communication circuit section 31 Wireless LAN Department (Short Range Wireless Communication Department) 32 Wired LAN section 33 Telephone Line Section 34 WAN Communications Section (Long-distance Wireless Communications Section) 42 Telephone Port 50 Control section 53 Recording Department 100 Communication equipment 110 Commercial power supply 120 Telephone

Claims

1. a power source switching unit that switches between a commercial power source and a battery; a control unit that controls the power supply switching unit and switches the mode of the communication device; A learning unit that learns communication power consumption according to a time period, The control unit is Restricting a communication function according to a stage of dividing the remaining battery capacity of the battery; During a time period when the communication power consumption learned by the learning unit is low, a communication unit having high communication power consumption is stopped from functioning. A communication device comprising:

2. 2. The communication device according to claim 1, the battery is a secondary battery, A charging rate measuring circuit for measuring a charging rate of the secondary battery is further provided. The control unit is In a time period during which the communication power consumption is high as learned by the learning unit, when the charging rate is divided into three stages of "high", "medium", and "low", the communication function is not restricted when the charging rate is high, the speed of the communication function is restricted when the charging rate is medium, and the communication function is stopped when the charging rate is low. A communication device comprising:

3. 3. The communication device according to claim 2, When the control unit performs the speed restriction, the control unit reduces the set speed of the communication function while maintaining the CPU clock of the control unit. A communication device comprising:

4. 3. The communication device according to claim 2, When the control unit performs the speed restriction, the control unit reduces a CPU clock of the control unit and also reduces a set speed of the communication function. A communication device comprising:

5. 2. The communication device according to claim 1, the battery is a secondary battery, A charging rate measuring circuit for measuring a charging rate of the secondary battery is further provided. The communication devices include a wired LAN unit, a wireless LAN unit, and a telephone line unit, The control unit is During a time period when the communication power consumption learned by the learning unit is low, instead of stopping the function of a communication unit with high communication power consumption, When the charging rate is higher than a first reference value, all of the wired LAN unit, the wireless LAN unit, and the telephone line unit are operated; limiting a communication speed of the wireless LAN unit when the charging rate is between a second reference value lower than the first reference value and the first reference value; When the charging rate is between a third reference value lower than the second reference value and the second reference value, the function of the wireless LAN unit is stopped and a communication speed of the wired LAN unit is limited; When the charging rate is between a fourth reference value lower than the third reference value and the third reference value, the functions of the wireless LAN unit and the wired LAN unit are stopped. A communication device comprising:

6. 6. The communication device according to claim 5, When limiting the communication speed, the control unit lowers the set speed of either or both of the wireless LAN unit and the wired LAN unit while maintaining a CPU clock of the control unit. A communication device comprising:

7. 6. The communication device according to claim 5, When limiting the communication speed, the control unit reduces a CPU clock of the control unit and also reduces a set speed of either or both of the wireless LAN unit and the wired LAN unit. A communication device comprising:

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