JP2007259041A - System and method for wireless packet communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless packet communication system capable of avoiding a fall in throughput caused by the existence of a public wireless access network with large traffic between adjacent base stations. <P>SOLUTION: Each base station in the wireless packet communication system comprises a measurement means, a storage means, a transmitting means, a receiving means, and a frequency channel selecting means. The measurement means measures the number of total terminal connection (traffic volume) at a predetermined frequency channel, and the storage means stores the measured result. The transmitting means transmits an interrogation signal to the other base station at the predetermined frequency channel to interrogate the number of total terminal connection (traffic volume) of the other base station, and transmits a response signal carrying information corresponding to the number of total terminal connection (traffic volume) of an own station in response to an interrogation signal from the other base station. The receiving means receives the interrogation signal and the response signal transmitted from the other base station. The frequency channel selecting means switches the predetermined frequency channel to the other frequency channel, if the existence of the other base station having the number of total terminal connection (traffic volume) over a predetermined threshold is detected by the response signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention selects an optimum frequency channel from among a plurality of frequency channels that can be used by a base station in a radio packet communication system that exchanges radio packets between a plurality of base stations and between a base station and a mobile terminal. The present invention relates to a wireless packet communication system and a wireless packet communication method.

  The wireless packet communication is a communication form adopted in various systems including a wireless LAN. The wireless LAN standard is being standardized by the IEEE802.11 committee and established as the IEEE802.11 standard (Non-Patent Document 1). One of the communication modes defined in this standard is an infrastructure mode. The infrastructure mode is a communication mode used in a wireless network formed by mobile terminals wirelessly connected to a base station (access point). The base station (access point) is basically connected to a wired network such as Ethernet, and has a bridge function between the wireless network and the wired network. That is, the base station (access point) viewed from the mobile terminal plays a role as an entrance to the wired network.

  FIG. 4 shows a configuration example of a radio station (base station, mobile terminal) of the radio packet communication system. In the figure, the radio station includes a transmission / reception processing unit 30, a transmission buffer 41, a radio packet generation unit 42, a transmission control unit 43, and a header removal unit 44. The transmission / reception processing unit 30 includes a modulation unit 31, a wireless transmission unit 32, an antenna 33, a wireless reception unit 34, a demodulation unit 35, a packet selection unit 36, and a carrier detection unit 37.

  In the wireless packet communication system of the IEEE802.11 standard, each wireless station performs signal detection (carrier sense) of the frequency channel used by our wireless station prior to transmission of the wireless packet, and if no signal is detected, the wireless packet The transmission process is started, and when a signal is detected, the transmission process is postponed. Hereinafter, processing of each unit will be described in detail, but description of frequency channel selection processing before carrier sense, backoff control processing after carrier sense, and the like will be omitted.

  A wireless signal received via the antenna 33 is input to the wireless reception unit 34. The wireless reception unit 34 performs reception processing including frequency conversion, filtering, quadrature detection, and AD conversion on the input wireless signal. When the antenna 33 connected to the radio reception unit 34 is not used for transmission, the radio signal in the frequency channel is always input, and the RSSI signal indicating the received power strength of the radio signal is the carrier detection unit. 37 is output. When the wireless reception unit 34 receives a wireless signal, the baseband signal subjected to reception processing is output to the demodulation unit 35.

  The carrier detection unit 37 determines the state of the frequency channel using the RSSI signal input from the wireless reception unit 34. If the received power intensity is below a predetermined threshold over a certain period, it is determined that the frequency channel is idle, otherwise it is determined that the frequency channel is busy. This determination result is notified to the transmission control unit 43 as a carrier sense result.

  On the other hand, a data frame is input to the transmission buffer 41 from an upper layer of a device (such as a computer) to which a wired network or a wireless station is connected. When receiving the data frame, the transmission buffer 41 notifies the transmission control unit 43 of the data frame input. Alternatively, the transmission buffer 41 sequentially outputs information on the accumulated data frames (number of data frames, data size, data frame destination address, etc.) to the transmission control unit 43.

  The transmission control unit 43 determines whether to start the transmission process based on the data frame accumulation information input from the transmission buffer 41 and the carrier sense result input from the carrier detection unit 37. When data frames are accumulated in the transmission buffer 41 and the frequency channel is empty, it is determined that transmission processing is started. In other cases, the transmission process is not started. When the transmission control unit 43 determines that transmission processing is started, the transmission control unit 43 instructs the transmission buffer 41 to output a data frame. The transmission buffer 41 outputs the data frame accumulated at the head to the wireless packet generation unit 42 according to the output instruction of the transmission control unit 43.

  The radio packet generation unit 42 generates a radio packet in which a header composed of control information such as a destination radio station address and a source radio station address and an error detection code are added to the data frame input from the transmission buffer 41. . The generated wireless packet is modulated by the modulation unit 31, subjected to transmission processing including DA conversion, frequency conversion, filtering, and power amplification by the wireless transmission unit 32, and transmitted from the antenna 33 as a wireless signal.

  On the other hand, the radio signal received by the radio reception unit 34 via the antenna 33 is converted into a baseband signal and input to the demodulation unit 35 as described above. The demodulator 35 demodulates the input baseband signal and outputs it to the packet selector 36 as a received packet. The packet selection unit 36 analyzes the control information included in the header of the received packet and outputs the received packet to an appropriate processing unit. When the destination wireless station address of the received packet matches with our wireless station address, the received packet is output to the header removing unit 44, and when it does not match, the received packet is discarded. The header removing unit 44 removes the header of the received packet addressed to our radio station, extracts the data frame, and outputs it as a received data frame to the upper layer of the wired network or connected apparatus.

  Although detailed description is omitted here, when the packet selection unit 36 receives a management packet in which authentication information or the like is described, or a control packet in which delivery confirmation information or the like is described, based on the information. They are output to a management packet processing unit that performs authentication processing and the like, and a control packet processing unit that performs delivery confirmation processing and the like.

With such a configuration, each wireless station can autonomously perform channel access control by carrier sense and transmit a wireless packet.
IEEE802.11, "Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications", IEEE std 802.11, August 1999

  A wireless packet communication system such as a wireless LAN can be applied to various environments such as a home network, an in-house network, and a public wireless access network. Here, the public wireless access network is a wireless access network that is installed at a place where an unspecified number of people gather, such as a railway station or an airport, and is a network that anyone can access freely if subscribed to the service. Point to. In such a public radio access network, it is considered that the number of users accessing the network simultaneously is relatively large, and thus the traffic transmitted and received is very large. On the other hand, in the home network and the in-house network, the number of users connected simultaneously is relatively small and the traffic is also small. In such a situation, if a public radio access network is operated in the vicinity where a home network or an in-house network is operated, there is a possibility that the former network may have a reduced throughput.

  For example, it is assumed that a home network (in-house network) using a wireless LAN is constructed in the vicinity operated by the public wireless access network, and these networks select the same frequency channel. A system image in this case is shown in FIG.

  In FIG. 5, a base station (access point) 51 of a public wireless access network 50 is wired to a public network (for example, Internet service provider network) 52 and wirelessly connected to mobile terminals 53-1 to 53-3. The That is, each mobile terminal 53-1 to 53-3 accesses the public network 52 via the base station 51. On the other hand, a base station (access point) 61 of the home network 60 is wired to the home network 62 and wirelessly connected to the mobile terminal 63. The mobile terminal 63 accesses the home network 62 via the base station 61. Note that an Internet service provider network is connected to the home network 62 via a home server or the like (not shown).

  In such a system, it is assumed that the base station 51 of the public wireless access network 50 and the base station 61 of the home network 60 operate on the same frequency channel (chA). At this time, when a large number of users temporarily access the public wireless access network 50 at the same time or when heavy users access, the channel capacity of the home network 60 is reduced by the traffic of these users, resulting in a throughput. Will drop. Further, when a plurality of neighboring public radio access networks 50 are operated on the same frequency channel, the same problem occurs when the number of accesses on one side increases.

  In consideration of such circumstances, the present invention selects a predetermined frequency channel from a plurality of frequency channels that can be used by a base station (access point), and wirelessly communicates with a mobile terminal under its control via the predetermined frequency channel. An object of the present invention is to provide a radio packet communication system and a radio packet communication method capable of avoiding a decrease in throughput caused by the existence of a public radio access network in which traffic increases in a radio packet communication system for exchanging packets. To do.

  In the first invention, a plurality of base stations exist, a predetermined frequency channel is selected from a plurality of frequency channels that can be used by each base station, and each base station and each base station are selected via the predetermined frequency channel. In a wireless packet communication system in which wireless packets are exchanged with subordinate mobile terminals, each base station uses the predetermined frequency channel and the total number of mobile terminal connections that are the number of mobile terminals newly connected to the current station. Alternatively, the base station stores the measurement means for measuring the traffic volume, the storage means for storing the total number of terminal connections or the traffic volume measured by the measurement means, and other base stations existing in a predetermined frequency channel. Sends an inquiry signal to inquire about the total number of connected terminals or traffic volume, and the number of total terminal connections at the local station in response to inquiry signals from other base stations Or a transmission means for transmitting a response signal carrying information corresponding to the traffic volume, a reception means for receiving an inquiry signal and a response signal transmitted from another base station, and the total number of terminal connections or traffic volume according to the response signal Frequency channel selection means for switching a predetermined frequency channel to another frequency channel when detecting the presence of another base station exceeding the predetermined threshold.

  Here, the transmission means is configured to transmit a response signal in which the total number of terminal connections or the traffic amount in the own station is transmitted in response to the received inquiry signal, and the frequency channel selection means is the base station that has transmitted the response signal. The total number of terminal connections or the traffic volume may be acquired, and when the total number of terminal connections or the traffic volume exceeds a predetermined threshold, the predetermined frequency channel may be switched to another frequency channel.

  Further, the transmission means is configured to transmit a response signal notifying that if the total number of terminal connections or the traffic amount in the own station exceeds a predetermined threshold with respect to the received inquiry signal, the frequency channel selection means May be configured to switch a predetermined frequency channel to another frequency channel in accordance with the response signal.

  Further, the measuring means determines whether or not the mobile terminal is newly connected based on the identifier of the mobile terminal connected to the own station, and measures the number of newly connected mobile terminals as the total number of terminal connections, or The amount of data included in the wireless packet received from the mobile terminal connected to the local station, and the amount of data included in the wireless packet transmitted to the mobile terminal connected to the local station and confirmed to be received normally Is periodically measured as the traffic volume.

  In the second invention, there are a plurality of base stations, a predetermined frequency channel is selected from a plurality of frequency channels that can be used by each base station, and each base station and each base station are selected via the predetermined frequency channel. In a wireless packet communication method for exchanging wireless packets with subordinate mobile terminals, each base station uses the predetermined frequency channel and the total number of mobile terminal connections that are the number of mobile terminals newly connected to the current station. Alternatively, the traffic amount is measured by the measuring means, the total number of connected terminals or the traffic amount measured by the measuring means is stored in the storage means, and the base station stores it for other base stations existing in a predetermined frequency channel. An inquiry signal is sent to inquire about the total number of connected terminals or traffic volume, and the number of total terminal connections or A response signal carrying information corresponding to the Fick amount is transmitted, an inquiry signal and a response signal transmitted from another base station are received, and the total number of terminal connections or the amount of traffic exceeds a predetermined threshold by the response signal When the presence of another base station is detected, a predetermined frequency channel is switched to another frequency channel.

  Here, the response signal is a configuration in which the total number of terminal connections or the traffic amount in the own station is placed on the received inquiry signal, and the base station that has received the response signal connects to the total terminal of the base station that has transmitted the response signal. The predetermined frequency channel may be switched to another frequency channel when the number or traffic volume is acquired and the total number of terminal connections or traffic volume exceeds a predetermined threshold.

  In addition, the response signal is configured to notify that if the total number of terminal connections or traffic volume in the own station exceeds a predetermined threshold with respect to the received inquiry signal, the base station that has received the response signal, A predetermined frequency channel may be switched to another frequency channel according to the response signal.

  Further, the measuring means determines whether or not the mobile terminal is newly connected based on the identifier of the mobile terminal connected to the own station, and measures the number of newly connected mobile terminals as the total number of terminal connections, or The amount of data included in the wireless packet received from the mobile terminal connected to the local station, and the amount of data included in the wireless packet transmitted to the mobile terminal connected to the local station and confirmed to be received normally May be periodically measured as the traffic volume.

  In the present invention, when there is a base station using the same frequency channel in the vicinity and the total number of terminals connected to the base station or the traffic volume is large, the base station is used in a public radio access network. It can be determined as a base station and the frequency channel used by our base station can be switched to another frequency channel. Thereby, it is possible to avoid the use of the same frequency channel as that of the public radio access network, and it is possible to avoid a decrease in throughput caused by the presence of the public radio access network.

  FIG. 1 shows a configuration example of a base station in a wireless packet communication system of the present invention. Here, the configuration of the main part related to communication between base stations is shown, but the basic configuration of the base station is as shown in FIG.

  In FIG. 1, the base stations 10 </ b> A and 10 </ b> B include a measurement unit 11, a storage unit 12, a transmission unit 13, a reception unit 14, and a frequency channel selection unit 15. The measuring means 11 measures the total number of terminal connections or the amount of traffic that is the number of mobile terminals newly connected to the own station up to the present using a predetermined frequency channel selected from a plurality of usable frequency channels. The storage unit 12 stores the total number of connected terminals or the amount of traffic measured by the measuring unit 11. The transmission means 13 transmits an inquiry signal inquiring about the total number of connected terminals or the amount of traffic stored in the base station to another base station existing in a predetermined frequency channel. In response to the inquiry signal, a response signal carrying the total number of terminals connected in the own station or the traffic volume is transmitted. The receiving unit 14 receives an inquiry signal and a response signal transmitted from another base station. When base stations 10A and 10B have selected different frequency channels, the inquiry signal is not received and the corresponding response signal is not transmitted. The frequency channel selection means 15 obtains the total number of terminal connections or traffic volume in another base station from the response signal, and if the total number of terminal connections or traffic volume exceeds a predetermined threshold, the frequency channel selection means 15 selects a predetermined frequency channel. Switch to another frequency channel.

  FIG. 2 shows a processing flow in the base station of the wireless packet communication system of the present invention. This processing flow is a procedure for selecting an appropriate frequency channel in the base station 51 of the public wireless access network 50 and the base station 61 of the home network 60 shown in FIG. To be implemented. Specifically, the base stations 51 and 61 are provided with timers, and when the timer times out, the frequency channel selection process shown in FIG. 2 is started.

  For frequency channel selection, for example, the radio reception unit 34, the carrier detection unit 37, and the transmission control unit 43 shown in FIG. 4 are used to measure reception power and channel utilization rate in all usable frequency channels. As a result, there is a method of selecting a frequency channel with the lowest received power or channel utilization rate, but the present invention is not limited to this method.

  Hereinafter, the frequency channel selection processing procedure in the base station (access point) will be described with reference to FIG. 1 and FIG.

  The transmission means 13 of the base station (access point) transmits an inquiry signal for inquiring the total number of connected terminals to the adjacent base station (access point) using a predetermined frequency channel (S11). Here, the total number of terminals connected is a parameter managed by each base station, and indicates the number of mobile terminals newly connected to the base station so far. That is, every time a mobile terminal connects, the measuring means 11 of each base station determines whether or not the mobile terminal has been connected in the past, and increments the total number of terminal connections by 1 for a new connection. And stored in the storage means 12. Since the public wireless access network is a network to which an unspecified number of mobile terminals are connected, there is a high possibility that the total number of connected terminals is very large. On the other hand, since the same mobile terminal is always connected to the home network or the in-house network, the total number of connected terminals does not increase, and the upper limit is almost known.

  On the other hand, when the receiving unit 14 receives the inquiry signal, the adjacent base station using the predetermined frequency channel returns the total number of terminal connections stored in the storage unit 12 from the transmitting unit 13 as a response signal. When the frequency channel to be used is different from that of the adjacent base station, the inquiry signal is not received, and the conventional problem described above does not occur.

  The receiving means 14 of the base station that transmitted the inquiry signal receives the response signal (total number of connected terminals) returned from the adjacent base station (S12), and returns the response signal to the management list of the frequency channel selecting means 15 The base station identifier and the total number of connected terminals are registered (updated) in association with each other (S13).

  When response signals are received from all pre-registered base stations (S14), or when the response signal reception period has elapsed (timer timed out) (S15), the frequency channel selection means 15 determines the respective base stations. The total number of connected terminals in the network is compared with a predetermined threshold (S16). Here, if the total number of terminals connected to the adjacent base station exceeds the threshold, frequency channel selection processing is performed (S17), and switching from the currently selected frequency channel to another frequency channel is performed. Do.

  For example, in the system shown in FIG. 5, three mobile terminals are currently connected to the base station 51 of the public wireless access network 50, the total number of connected terminals is 64, and the base station 61 of the home network 60 It is assumed that the threshold of the total number of terminal connections in the frequency channel selection process is 64. At this point, the base station 61 does not switch frequency channels. However, when a new mobile terminal is further connected to the base station 51, the base station 61 transmits an inquiry signal and receives a response signal (total number of connected terminals: 65) returned from the base station 51. In addition, the base station 61 detects that the total number of terminal connections has been exceeded, and switches from the currently selected frequency channel to another frequency channel.

  In the processing flow of FIG. 2, when the home network (in-house network) and the public wireless access network are adjacent to each other, the adjacent base station is connected to the public wireless by obtaining the total number of terminal connections of the adjacent base stations. The frequency channel used by the person who is determined to be a base station in the access network, that is, the home network (in-house network) is switched. Further, when the total number of connected terminals exceeds the threshold value between base stations of the public radio access network, the frequency channel used by the other base station is switched.

  Further, the traffic amount may be used instead of the total number of terminal connections in the base station described above. This is because a mobile terminal connected to a public radio access network accesses for the purpose of communication, and therefore a temporary increase in traffic frequently occurs according to the number of connected mobile terminals. Therefore, even if the “total number of connected terminals” in the processing flow shown in FIG. 2 is read as a traffic volume or a frequency at which the traffic volume temporarily increases, the same frequency channel can be switched. The amount of traffic in the base station is included in the amount of data included in the wireless packet received from the mobile terminal, and in the wireless packet that has been transmitted to the mobile terminal connected to the mobile station and confirmed that it has been received normally. The amount of data is measured periodically.

  FIG. 3 shows a frame format example of a conventional radio management packet, inquiry signal, and response signal. As shown in FIG. 3A, a conventional radio management packet is composed of a MAC header, a payload including a plurality of information elements (such as transmission rate and base station identifier), and an error detection code. As shown in FIG. 3 (2), the inquiry signal and the response signal used in the present invention add a new information element to the payload of the conventional radio management packet. In the case of a signal, the total number of connected terminals is written. In addition, the total terminal connection number may be replaced with a value of the traffic volume or the frequency at which the traffic volume temporarily increases, or the total terminal connection request / response and the traffic volume request / response may be described together. Also good.

  In the above description, the base station that has obtained the total number of connected terminals (or traffic volume, etc.) from the adjacent base station determines whether or not frequency channel switching is necessary. The base station side determines whether its own total number of terminal connections (or traffic volume, etc.) exceeds the threshold value, and sends a response signal to the base station side that transmitted the inquiry signal (for example, frequency channel switching instruction). You may reply as In this case, the base station that has received the response signal for the inquiry signal switches the frequency channel using the response signal.

The figure which shows the structural example of the base station of the radio | wireless packet communication system of this invention. The figure which shows the processing flow in the base station of the radio | wireless packet communication system of this invention. The figure which shows the frame format example of the conventional radio | wireless management packet, an inquiry signal, and a response signal. The figure which shows the structural example of the radio station (a base station, a mobile terminal) of a radio | wireless packet communication system. The figure which shows the system configuration for demonstrating the conventional problem.

Explanation of symbols

10A, 10B Base station 11 Measuring unit 12 Storage unit 13 Transmitting unit 14 Receiving unit 15 Frequency channel selecting unit 30 Transmission / reception processing unit 31 Modulating unit 32 Radio transmitting unit 33 Antenna 34 Wireless receiving unit 35 Demodulating unit 36 Packet selecting unit 37 Carrier detecting unit 41 Transmission Buffer 42 Radio Packet Generation Unit 43 Transmission Control Unit 44 Header Removal Unit

Claims (10)

A plurality of base stations exist, a predetermined frequency channel is selected from a plurality of frequency channels that can be used by each base station, and each base station and each of its subordinate mobile terminals are connected via the predetermined frequency channel. In a wireless packet communication system for exchanging wireless packets between
Each of the base stations
Measuring means for measuring the total number of terminal connections or the amount of traffic that is the number of mobile terminals newly connected to the current station in the predetermined frequency channel,
Storage means for storing the total number of terminal connections or traffic volume measured by the measuring means;
An inquiry signal for inquiring about the total number of connected terminals or the amount of traffic stored in the base station is transmitted to another base station existing in the predetermined frequency channel, and an inquiry signal from another base station is transmitted. Transmitting means for transmitting a response signal carrying information corresponding to the total number of terminal connections or traffic volume in the own station,
Receiving means for receiving the inquiry signal and the response signal transmitted from the other base station;
Frequency channel selection means for switching the predetermined frequency channel to another frequency channel when detecting the presence of another base station whose total number of terminal connections or traffic volume exceeds a predetermined threshold by the response signal. A wireless packet communication system characterized by the above. The radio packet communication system according to claim 1, wherein
The transmission means is configured to transmit a response signal that includes the total number of terminal connections or traffic volume in the local station with respect to the received inquiry signal,
The frequency channel selection means obtains the total number of terminal connections or traffic volume of the base station that has transmitted the response signal, and when the total number of terminal connections or traffic volume exceeds a predetermined threshold, the predetermined frequency A wireless packet communication system, characterized in that a channel is switched to another frequency channel. The radio packet communication system according to claim 1, wherein
The transmission means is configured to transmit a response signal notifying that if the total number of terminal connections or traffic volume in the local station exceeds a predetermined threshold with respect to the received inquiry signal,
The radio packet communication system, wherein the frequency channel selection means is configured to switch the predetermined frequency channel to another frequency channel according to the response signal. The radio packet communication system according to claim 1, wherein
The measurement means is configured to determine whether the mobile terminal is a newly connected mobile terminal based on an identifier of the mobile terminal connected to the local station, and to measure the number of newly connected mobile terminals as the total number of connected terminals. A wireless packet communication system. The radio packet communication system according to claim 1, wherein
The measuring means includes a data amount included in a wireless packet received from a mobile terminal connected to the local station, and a wireless packet transmitted to the mobile terminal connected to the local station and confirmed to be received normally. A wireless packet communication system, characterized in that the amount of data included in the data is periodically measured as the traffic amount. A plurality of base stations exist, a predetermined frequency channel is selected from a plurality of frequency channels that can be used by each base station, and each base station and each of its subordinate mobile terminals are connected via the predetermined frequency channel. In a wireless packet communication method for exchanging wireless packets between
Each of the base stations
With the predetermined frequency channel, measure the total number of terminal connections or the amount of traffic that is the number of mobile terminals newly connected to the own station so far with the measuring means,
The total number of terminal connections or the traffic volume measured by the measuring unit is stored in a storage unit, and the total number of terminal connections stored by the base station with respect to another base station existing in the predetermined frequency channel Or send an inquiry signal to inquire about the traffic volume, and send a response signal with information corresponding to the total number of terminal connections or traffic volume at your own station in response to inquiry signals from other base stations,
Receiving the inquiry signal and the response signal transmitted from the other base station;
A radio packet that switches the predetermined frequency channel to another frequency channel when detecting the presence of another base station whose total number of connected terminals or traffic volume exceeds a predetermined threshold by the response signal Communication method. The wireless packet communication method according to claim 6, wherein
The response signal is a configuration in which the total number of terminal connections or traffic volume in the own station is placed on the received inquiry signal
The base station that has received the response signal obtains the total number of terminal connections or traffic volume of the base station that has transmitted the response signal, and when the total number of terminal connections or traffic volume exceeds a predetermined threshold, A wireless packet communication method characterized by switching a predetermined frequency channel to another frequency channel. The wireless packet communication method according to claim 6, wherein
The response signal is configured to notify that if the total number of terminal connections or traffic volume in the own station exceeds a predetermined threshold with respect to the received inquiry signal,
The base station that has received the response signal switches the predetermined frequency channel to another frequency channel according to the response signal. The wireless packet communication method according to claim 6, wherein
The measuring means determines whether the mobile terminal is a newly connected mobile terminal based on an identifier of a mobile terminal connected to the local station, and measures the number of newly connected mobile terminals as the total number of connected terminals. A wireless packet communication method. The wireless packet communication method according to claim 6, wherein
The measuring means includes a data amount included in a wireless packet received from a mobile terminal connected to the local station, and a wireless packet transmitted to the mobile terminal connected to the local station and confirmed to be received normally. A wireless packet communication method characterized by periodically measuring the amount of data included in the traffic as the traffic amount.

Images