JP3851587B2 - Wireless communication terminal device and wireless communication relay device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless communication terminal apparatus that communicates data using a plurality of wireless media, and a wireless communication relay apparatus that connects the wireless communication terminal apparatus to other types of networks.
[0002]
[Prior art]
Conventionally, as a data transmission system used by a wireless communication terminal device and a network constituted by an access point device that performs bridging for connecting the wireless communication terminal device and a local area network or a backbone network, Some of these are described in IEEE Std 802.11-1997 [1].
[0003]
In this method, a terminal that transmits data determines whether or not a wireless medium is unused for a certain period of time, and if it is not used, can acquire an access right and send a signal. CA (Carrier Sense Multiple Access with Collision Avoidance) method (see pp. 77-78 of 9.2.5.1), and when the load of wireless media is very high, the access right is acquired. , Has a characteristic that a large delay occurs.
[0004]
Further, in this system, the wireless communication terminal device and other distributed devices are connected via an ad hoc mode in which a network is simply configured between wireless communication terminal devices called stations (STN) and a device called an access point (AP). There is an infrastructure mode in which a network is configured by connecting a system (DS;) (see Chapter 5 on pages 9 to 28).
[0005]
FIG. 39 is a diagram illustrating an example of a network configuration employing a conventional infrastructure mode.
[0006]
In this figure, BSS is called a basic service set, which is a service area of a wireless communication terminal device, and a device that connects BSS and DS is an access point device.
[0007]
In the infrastructure mode, the wireless communication terminal device is accommodated and operated in only one access point device. Here, when newly joining the network, the wireless communication terminal device waits for a beacon frame from the access point device in the frequency channel to be used or transmits a probe request for requesting a beacon from the access point device to Search for access point devices.
[0008]
The beacon signal includes a time stamp, beacon interval, capability information, SSID, support rate information, PHY parameter set, CF parameter set, IBSS parameter set, and TIM.
[0009]
When receiving the beacon, the wireless communication terminal device performs an authentication process with the access point device that is the transmission source of the beacon, is accommodated in the access point device, and performs data communication.
[0010]
[Problems to be solved by the invention]
However, in the conventional apparatus, when a plurality of beacons are received in the wireless communication terminal apparatus, the access point apparatus selects the beacon source access point apparatus having the maximum received electric field strength and issues an authentication request. When the point device accommodates a large number of wireless communication terminal devices, the transmission used by the wireless communication terminal device, particularly the wireless communication terminal device that communicates data requesting real-time characteristics such as moving images, etc. There is a problem in that the speed cannot be satisfied and the data transfer delay increases. Here, the transmission rate represents the number of bits per second that can be communicated between the relay station and the wireless communication terminal device.
[0011]
The present invention has been made in view of the above points, and a wireless communication terminal device capable of reducing a data transfer delay, and a communication system by distributing transmission rates used by the wireless communication terminal devices accommodated therein. An object of the present invention is to provide a wireless communication relay device that can reduce the load on the network.
[0012]
[Means for Solving the Problems]
The wireless communication terminal device according to the present invention includes means for receiving a signal storing wireless communication terminal device accommodation information in a wireless communication relay device, means for transmitting a signal requesting a signal from the wireless communication relay device, and the wireless A means for recording information contained in a signal from the communication relay device; a means for selecting an optimum wireless communication relay device by referring to the recorded information; and an accommodation request for the selected wireless communication relay device. A means for transmitting and a means for receiving an accommodation response from the selected wireless communication relay device are provided, and the wireless communication terminal device is required to communicate from the wireless communication terminal device accommodation status of the surrounding wireless communication relay device. The wireless communication relay device having the best condition is selected from the wireless communication relay devices having usable transmission speeds higher than the transmission speed.
[0013]
According to this configuration, data transfer from the access point device to the wireless communication terminal device or from the wireless communication terminal device to the access point device can be performed with a minimum transfer delay. A great effect is obtained in that the transfer delay in the wireless section between the wireless communication terminal device and the access point device that communicates data requiring real-time performance is greatly reduced.
[0014]
The wireless communication relay device of the present invention is responsive to means for recording the accommodation status of the wireless communication terminal device, means for receiving an accommodation information request signal from the wireless communication terminal device, and a signal from the wireless communication terminal device. Means for transmitting wireless communication terminal device accommodation information, means for receiving an accommodation request signal from the wireless communication terminal device, means for judging whether or not to accept the accommodation request, and a response signal to the accommodation request. A means for transmitting is provided, and the access point is configured to accommodate the wireless communication terminal apparatus only when communication with the wireless communication terminal apparatus is expected to be performed with low delay.
[0015]
According to this configuration, data transfer from the access point device to the wireless communication terminal device or from the wireless communication terminal device to the access point device can be performed with a minimum transfer delay. A great effect is obtained in that the transfer delay in the wireless section between the wireless communication terminal device and the access point device that communicates data requiring real-time performance is greatly reduced.
[0016]
  The wireless communication terminal device of the present invention communicates with other communication devices by connecting to any relay station using wireless communication.Wireless communication terminalA device,A communication means for transmitting a communication request signal for requesting system load information related to a load of a communication system to a relay station in a communication range when newly entering the network;From relay stations within rangeIncluding the number of accommodated terminals and the number of real-time communication terminalsGet system load informationAnd store it in the adjacent AP information tableObtaining means and obtained by said obtaining meansEach adjacent relay station stored in the adjacent AP information tableAnd a selection unit that selects a relay station to be connected based on the system load information.
[0017]
According to this configuration, data transfer from the access point device (wireless communication relay device) to the wireless communication terminal device or from the wireless communication terminal device to the access point device can be performed with a minimum transfer delay. A significant effect is obtained in that the transfer delay in the wireless section between the communication terminal device, particularly the wireless communication terminal device that communicates data requiring real-time property and the access point device is greatly reduced.
[0018]
  The wireless communication terminal device of the present invention is configured as described above,The system load information further includes at least one of an available transmission rate, a used transmission rate, and a radio signal level.Take the configuration.
[0024]
  The wireless communication relay device of the present invention performs relay when the terminal device communicates with another communication device by connecting to the terminal device using wireless communication.Wireless communication relayA device,The terminal device has communication means for transmitting a communication request signal for requesting system load information related to a load of a communication system to the wireless relay device in a communication range when newly entering the network, and the wireless communication relay device Selecting a wireless communication relay device for accommodation based on the system load information including the number of accommodation terminals and the number of real-time communication terminals received fromThe terminal device relates to a load of a communication system, Including number of accommodated terminals and real-time communication terminalsWhen system load information is requested, a configuration for outputting the information is adopted.
[0025]
According to this configuration, data transfer from the access point device to the wireless communication terminal device or from the wireless communication terminal device to the access point device can be performed with a minimum transfer delay. A great effect is obtained in that the transfer delay in the wireless section between the wireless communication terminal device and the access point device that communicates data requiring real-time performance is greatly reduced.
[0026]
  In the wireless communication relay device according to the present invention, in the above configuration, the system load information further includes at least one of an available transmission rate, a usable transmission rate, and a wireless signal level.Take the configuration.
[0030]
  A wireless communication terminal device according to the present invention includes at least one wireless communication terminal device, the wireless communication terminal device, and a wireless communication relay device that performs bridging for connecting a local area network or a backbone network. NetworkThe wireless communication terminal deviceWireless communication relay devices located around when entering the networkButOf wireless communication terminal devices to be accommodated, Including number of accommodated terminals and real-time communication terminalsMeans for transmitting a signal requesting the wireless communication relay device to transmit accommodation information; means for receiving a signal of the accommodation information transmitted from the wireless communication relay device; means for recording the accommodation information; Means for recording characteristic information of the wireless communication terminal device; means for selecting a wireless communication relay device as a accommodation destination based on the accommodation information and the characteristic information of the wireless communication terminal device; and a wireless communication relay device as the accommodation destination. Means for transmitting a signal for requesting accommodation to the wireless communication relay device selected by the means for selecting; and means for receiving an accommodation response signal transmitted from a destination wireless communication relay device for the signal requesting accommodation And a configuration having the following.
[0031]
According to this configuration, the wireless communication terminal device can automatically select an access point device suitable for the characteristics of the communication data of the wireless communication terminal device when newly joining the network.
[0032]
  The wireless communication terminal device of the present inventionIn the above configuration, the accommodation information further includes at least one of a usable transmission rate, a usable transmission rate, and a wireless signal level.Take the configuration.
[0044]
  The wireless communication relay device of the present invention includes at least one wireless communication terminal device, the wireless communication terminal device, and a wireless communication relay device that performs bridging for connecting a local area network or a backbone network. NetworkWhen the wireless communication terminal device newly enters the network, the wireless communication terminal device transmits a communication request signal for requesting accommodation information of the wireless communication terminal device accommodated by a wireless communication relay device located in the vicinity to the wireless communication relay device in the communication range. A communication means for selecting the accommodation destination wireless communication relay device based on the accommodation information including the number of accommodation terminals and the number of real-time communication terminals received from the wireless communication relay device,Means for receiving a wireless communication terminal device accommodation information request signal including a scheduled transmission rate from the wireless communication terminal device, and a table for recording the accommodated wireless communication terminal device information; If you own a usable transmission rate that is higher than the scheduled transmission rate of the wireless communication terminal device,Includes the number of accommodated terminals and real-time communication terminalsWireless communication terminal device accommodation informationTellMeans for generating a signal, and the wireless communication terminal device accommodation information for the wireless communication terminal deviceTellMeans for transmitting a signal, means for receiving an accommodation request signal from a wireless communication terminal device, means for making a decision for receiving an accommodation request from a wireless communication terminal device, and receiving the accommodation request Included in the accommodation request signal when generating an accommodation response signal including means for generating an accommodation response signal for instructing a wireless communication terminal device, means for transmitting the accommodation response signal, and an accomodable indicator The wireless communication terminal device information is recorded in a table for recording the wireless communication terminal device information.
[0045]
According to this configuration, when the access point device can accommodate the wireless communication terminal device accommodation information to the wireless communication terminal device, the wireless communication terminal device-led accommodation processing is performed. Has the effect of being able to
[0046]
  The wireless communication relay device according to the present invention employs a configuration in which, in the above configuration, the accommodation information and the wireless terminal device accommodation information further include at least one of a usable transmission rate, a usable transmission rate, and a wireless signal level. .
[0061]
  The wireless communication relay device of the present invention includes at least one wireless communication terminal device, the wireless communication terminal device, and a wireless communication relay device that performs bridging for connecting a local area network or a backbone network. NetworkWhen the wireless communication terminal device newly enters the network, the wireless communication terminal device transmits a communication request signal for requesting accommodation information of the wireless communication terminal device accommodated by a wireless communication relay device located in the vicinity to the wireless communication relay device in the communication range. A communication means for selecting the accommodation destination wireless communication relay device based on the accommodation information including the number of accommodation terminals and the number of real-time communication terminals received from the wireless communication relay device,Accommodating wireless communication terminal deviceWireless communication terminal device accommodation, including the number of accommodation terminals and the number of real-time communication terminalsA configuration having a table for recording information and having a function of generating a radio communication terminal apparatus accommodation information signal and a function of transmitting a signal conveying the radio communication terminal apparatus accommodation information to the radio communication terminal apparatus is adopted.
[0062]
  The wireless communication relay device of the present invention has the above configuration,The accommodation information and the wireless terminal device accommodation information further include at least one of a usable transmission rate, a usable transmission rate, and a wireless signal level.Take the configuration.
[0081]
DETAILED DESCRIPTION OF THE INVENTION
In a mobile communication system represented by a mobile phone, each mobile station is connected to another communication device using a base station or the like as a relay station. Then, since the upper station of the base station centrally manages which base station the mobile station is accommodated in, the user of the mobile station cannot arbitrarily select the base station.
[0082]
On the other hand, the Internet is a huge network in which computer networks such as LANs and WANs that are scattered in various places are connected by a dedicated line, and a distributed network is adopted so that the network functions even if a server goes down. Yes.
[0083]
Since each network is independent and has an equal relationship, when a communication terminal device in a wireless LAN or the like is connected to an access point device (wireless communication relay device), the upper station of the access point device is connected to the communication terminal device. Management such as determining an access point device that accommodates the device is not performed.
[0084]
Therefore, when a communication terminal device using a wireless communication method is connected to a LAN or a backbone network, there is a method in which communication is performed using an access point device having the maximum electric field strength of a received signal as a relay station. It is used.
[0085]
The gist of the present invention is that the wireless communication terminal device takes the initiative in selecting the access point device. That is, the wireless communication terminal device requests the access point device to provide information on the load of the communication system, and can select the access point device to be connected based on the obtained information regardless of the electric field strength of the received signal. To.
[0086]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0087]
(Embodiment 1)
FIG. 1 is a block diagram showing an example of a configuration of a radio communication terminal apparatus according to Embodiment 1 of the present invention. Here, a predetermined procedure performed when the wireless communication terminal device connects to the access point device, that is, a procedure for acquiring an access right to the access point device (hereinafter referred to as a predetermined access attempt) is defined in IEEE 802.11. An example of the CSMA / CA scheme to be used will be described, but an access scheme such as TDMA, FDMA, or CDMA may be used. Also, the CSMA / CA system defined by IEEE 802.11 is to determine whether or not a wireless medium is unused for a certain period of time, and to acquire an access right to the wireless medium when it is unused. This is a possible method.
[0088]
The wireless communication terminal apparatus shown in FIG. 1 includes a physical layer processing unit 101, a MAC layer processing unit 102, an upper layer processing unit 103, an accommodation destination AP determination unit 104, and an adjacent AP information table 105.
[0089]
The physical layer processing unit 101 modulates the transmission signal output from the MAC layer processing unit 102, converts it to a radio signal, and transmits it from the antenna 110. Further, the wireless signal received from the antenna 110 is demodulated and a digital signal is output to the MAC layer processing unit 102.
[0090]
The MAC layer processing unit 102 adds a MAC frame header to the transmission data output from the upper layer processing unit 103 and outputs the transmission data to the physical layer processing unit 101. In addition, the digital signal output from the physical layer processing unit 101 is received. At this time, if an upper layer protocol data unit (PDU) such as IP (Internet Protocol) is included, the PDU is output to the upper layer processing unit 103.
[0091]
The adjacent AP information table 105 stores information on the access point device extracted from the AP accommodation information signal received by the MAC layer processing unit 102. In this table, for example, the MAC address of the access point device, the usable transmission rate, and the like are stored.
[0092]
When receiving the determination request signal from the MAC layer processing unit 102, the accommodation destination AP determination unit 104 refers to the adjacent AP information table 105 and determines in which access point device the wireless communication terminal device should be accommodated. The accommodation destination AP identifier is output to the MAC layer processing unit 102.
[0093]
The upper layer processing unit 103 corresponds to an OSI reference model network, transport, session, presentation, and application layer, and performs processing of each layer.
[0094]
Next, the operation of the wireless communication terminal apparatus having the above configuration will be described using the flow shown in FIG.
[0095]
For example, immediately after the power is turned on or when newly joining the network, the MAC layer processing unit 102 makes a determination request to the accommodation destination AP determination unit 104 (ST1100).
[0096]
When receiving the determination request from the MAC layer processing unit 102, the accommodation destination AP determination unit 104 refers to the adjacent AP information table 105, and in which access point device the wireless communication terminal device according to the present embodiment is accommodated. It should be determined (ST1200) and notified to the MAC layer processing unit 102.
[0097]
In the determination, an access point device having the largest usable transmission rate field value among access point devices entered in the adjacent AP information table 105 is selected as the accommodation destination access point device.
[0098]
If there is an appropriate access point device, the accommodation destination AP determination unit 104 further outputs the accommodation destination AP identifier to the MAC layer processing unit 102.
[0099]
When the MAC layer processing unit 102 receives the accommodation destination AP identifier from the accommodation destination AP determination unit 104, the MAC layer processing unit 102 generates an accommodation request signal including the accommodation destination AP identifier, the identifier of the wireless communication terminal device, the scheduled transmission rate, and the like. (ST1300).
[0100]
When carrier-free according to the CSMA / CA method is detected (ST1400), MAC layer processing section 102 causes physical layer processing section 101 to transmit an accommodation request signal (ST1500).
[0101]
The access point apparatus adjacent to the wireless communication terminal apparatus transmits an accommodation response signal that is a response indicating whether the wireless communication terminal apparatus can be accommodated (ST1600). If there is an accommodation permission indicator in the accommodation response signal transmitted from the adjacent access point device, the accommodation processing in this access point device is completed, and the data transmission and reception standby states are entered.
[0102]
Also, if there is an unacceptable indicator in the accommodation response signal transmitted from the adjacent access point apparatus, the process returns to ST1300 again to generate the accommodation request signal. However, the number of consecutive trials of the accommodation request signal transmission to the same access point device is checked (ST1610). A determination request is issued.
[0103]
Here, the number of consecutive trials is normally set to one time, but may be set to two times or more when it is desired to repeat a request for the same access point device.
[0104]
In the determination of ST1200, when there is no access point device suitable for accommodation, the accommodation destination AP determination unit 104 determines an appropriate access point device for the MAC layer processing unit 102 after an interval of a certain period (for example, 10 sec). Notify that there is no. The reason for setting an interval of a certain period is to prevent a situation in which a response signal from an adjacent access point device cannot be received due to a temporary deterioration in the environment of the wireless section.
[0105]
The MAC layer processing unit 102 generates a new entry signal including the identifier of this wireless communication terminal apparatus (ST1210), and after detecting carrier-free (ST1220), causes the physical layer processing unit 101 to transmit this new entry signal (ST1230). ).
[0106]
After transmitting the new entry signal, accommodation information signals that are responses from adjacent access point devices are collected for a certain period (ST1240). This period is hereinafter referred to as an adjacent AP information collection period.
[0107]
MAC layer processing section 102 receives the accommodation information signal transmitted by the adjacent access point apparatus from physical layer processing section 101, and extracts access point apparatus information from the signal (ST1250). When there is an AP that can be accommodated, the MAC layer processing unit 102 outputs and records the access point device information in the adjacent AP information table 105. If there is no AP that can be accommodated, a redetermination request is issued to the accommodation destination AP determination unit 104.
[0108]
Next, when the wireless communication terminal device (STN1) according to the present embodiment newly enters the network, a sequence until it is accommodated in the adjacent access point devices (AP1, AP2) will be described with reference to FIG. explain. Here, an example will be described in which STN1 is located in an overlapping portion of the areas of AP1 and AP2 as shown in FIG.
[0109]
When newly entering the network, the STN 1 broadcasts or multicasts a new entry instruction signal including the identifier of the STN 1 to surrounding access point devices.
[0110]
After transmitting the new entry signal, the STN 1 collects the accommodation information signal that is a response from the adjacent access point device during the adjacent AP information collection period.
[0111]
AP1 transmits an AP1 accommodation information signal to STN1. Similarly, AP2 transmits an AP2 accommodation information signal to STN1.
[0112]
The response signal from the adjacent access point device stores, for example, the MAC address and usable transmission rate (Mbps) information of the access point device, and these values are recorded in the adjacent AP information table 105 of STN1. The
[0113]
The accommodation destination AP determination unit 104 refers to the adjacent AP information table 105 after the adjacent information collection period ends. Since there are a plurality of entries in the adjacent AP information table 105, the AP having the largest usable transmission rate field value is selected as the accommodation destination access point device (for example, AP2), and the MAC layer processing unit 102 is instructed. Is done.
[0114]
The MAC layer processing unit 102 generates an accommodation request signal for the AP 2 designated by the accommodation destination AP determination unit 104 and passes it to the physical layer processing unit 101.
[0115]
The physical layer processing unit 101 converts the accommodation request signal into a radio signal, transmits the accommodation request signal from the antenna 110 to the AP 2, and waits for the accommodation response signal from the AP 2.
[0116]
When AP2 can accommodate STN1, AP2 transmits an accommodation response signal to STN1. If the accommodation is impossible, an accommodation response signal indicating that accommodation is not possible may be transmitted to the STN 1.
[0117]
When STN1 receives the accommodation response signal from AP2, analyzes the signal in MAC layer processing section 102, and obtains information that STN1 can be accommodated in AP2, completes the accommodation process, and transmits data and It will be in a standby state for reception.
[0118]
When the accommodation is rejected in AP2, if AP1 satisfies the accommodation conditions, an accommodation request is made to AP1. When there is an instruction from the accommodation destination AP determination unit 104 that there is no appropriate AP, a new entry signal is generated again, and information collection processing for adjacent access point devices is performed.
[0119]
FIG. 5 shows an example of table data stored in the adjacent AP information table 105.
[0120]
Here, it is recorded that the usable transmission rate of AP1 is 2 Mbps and the usable transmission rate of AP2 is 27 Mbps. Therefore, with the above configuration, AP2 is selected as the accommodation destination AP.
[0121]
For example, when there are a plurality of access point devices having the optimum conditions as accommodation destinations, that is, when the data in fields other than the AP address in the adjacent AP information table 105 are exactly the same, the accommodation destination AP determination unit 104 (1) Randomly select one from a plurality of access point devices, (2) Select the access point device that returned the AP accommodation information earliest, (3) Access that returned the AP accommodation information the latest Select a point device. (4) Select an access point device stored at the smallest storage address in the adjacent AP information table 105, or (5) Select an access point device stored at the largest location. A method such as selecting is used.
[0122]
Next, the frame structure of the signal appearing in the above description will be described. These signals are obtained by improving the MAC frame header according to IEEE 802.11-1997.
[0123]
FIG. 6 is a diagram illustrating an example of a frame configuration of a new entry signal.
[0124]
In this figure, a Frame Control field is for designating a protocol version, a frame type, and the like. The DA field stores the destination MAC address. Broadcast or multicast address to surrounding access points. The SA field stores the MAC address of the wireless communication terminal device. The BSSID field is the same as the DA field. The Sequence Control field stores a sequence number. The FCS field stores a 32-bit CRC code.
[0125]
FIG. 7 is a diagram for explaining the Frame Control field in detail (see IEEE 802.11-1997 7.1.3).
[0126]
2 to 7 bits (B2 to B7) from the top of this signal indicate that it is a new entry signal. Here, the Type field is set to 00 (management frame), and the Subtype field is set to any of 0110 to 0111 and 1101 to 1111 (a value not used in IEEE 802.11-1997, for example, 0110). In some cases, the Type field is set to 11 (reserved) and the value is set to any of 0000 to 1111. By uniquely determining this value, it indicates a new entry signal.
[0127]
As shown in FIG. 8, before the FCS field, the transmission frame type TC (identification of real time, non-real time, etc.) of the wireless communication terminal device, the scheduled transmission speed BW (requires 6 Mbps or 12 Mbps, etc.), etc. May be included.
[0128]
The communication request generation signal also has the same frame structure, but in order to obtain metrics information, it is necessary to store the MAC address (6 octet) of the destination device as the communication partner (not shown).
[0129]
FIG. 9 is a diagram illustrating an example of a frame configuration of the AP accommodation information signal. The basic configuration is the same as that in FIG. 6, and the description of the same components is omitted.
[0130]
In this figure, a value different from the new entry signal is set in the Frame Control field. The DA field stores the MAC address of the wireless communication terminal device that transmitted the new entry signal. The SA field stores the MAC address of the access point device. The BSSID field stores the same value as the SA field. The BW field stores a transmission rate (for example, shown in units of 500 kbit / sec) that can be further used by the access point apparatus. Here, for example, metrics information may be stored in the Reserved field.
[0131]
As shown in FIG. 10, the ASTNs field may have a frame configuration in which the number of wireless communication terminal devices accommodated by the access point device and TC are stored.
[0132]
Moreover, as shown in FIG. 11, you may add the field which each stores the MAC address of the radio | wireless communication terminal device which the access point apparatus accommodates, and the transmission rate currently used.
[0133]
FIG. 12 is a diagram illustrating an example of a frame configuration of the accommodation request signal. The basic configuration is the same as in FIG. 9, and the description of the same components is omitted. This is an extension of the IEEE 802.11 Association Request (see IEEE 802.11-1997 7.2.3, 7.2.3.4). The transmission speed field to be used is added to the Frame Body.
[0134]
In this figure, in the Frame Control field, a value for identifying the accommodation request signal is set in Type and Subtype, as in the above frame configuration. The DA field stores the MAC address of the access point device that is the destination of the accommodation request. The SA field stores the MAC address of the wireless communication terminal device that transmits the accommodation request signal. The BW field stores the scheduled transmission rate of the wireless communication terminal device that transmits the accommodation request signal.
[0135]
FIG. 13 is a diagram illustrating an example of a frame configuration of the accommodation response signal. The basic configuration is the same as that of FIG. 12, and the description of the same components is omitted. This is an extension of the IEEE 802.11 Association Response (see IEEE 802.11-1997 7.2.3, 7.2.3.5). From the information in the Status Code field, it is determined whether accommodation is permitted or not possible. If it can be accommodated, 0 is stored in the Status Code field, and 17 is not stored.
[0136]
As described above, according to the present embodiment, since the terminal wireless communication terminal device selects the optimum access point device for the wireless communication terminal device, the transfer delay between the wireless communication terminal device and the access point device is greatly increased. Therefore, data transfer can be performed efficiently at high speed.
[0137]
Here, the case where the information given from the access point device is the MAC address of the access point device and the usable transmission rate has been described as an example, but the number of terminals accommodated by the access point device, each address, It may be the transmission rate used by each, the number of terminals performing real-time communication among the terminals accommodated by the access point device, and the transmission rate used.
[0138]
Further, the physical layer processing unit 101 may store the reception signal level information and error correction processing information of the accommodation information signal from the access point device in the adjacent AP information table 105.
[0139]
For example, in FIG. 14, there are responses from AP1, AP2, and AP3. In AP1, the number of accommodated terminals is 2, the usable transmission rate is 48 Mbps, the number of real-time communication terminals is 1, the usage transmission rate is 6 Mbps, and the signal level is A. It is indicated that the error correction processing has been corrected because an error is detected. From this adjacent AP information table 105, since AP3 has the smallest number of accommodated terminals, the usable transmission speed is wide, the signal level is high, and the line condition is good, it is selected to issue an accommodation request to AP3. Here, normalization of AAA, AA, and A is performed from the largest signal level, but the actual level can also be recorded.
[0140]
(Embodiment 2)
FIG. 15 is a block diagram showing an example of the configuration of the wireless communication terminal apparatus according to Embodiment 2 of the present invention. Note that this wireless communication terminal apparatus has the same basic configuration as the wireless communication terminal apparatus shown in FIG. 1, and the same components are denoted by the same reference numerals and description thereof is omitted.
[0141]
The feature of this embodiment is that the accommodation destination AP selection input unit 205, the neighboring AP information processing unit 204, and the neighboring AP information display unit instead of the accommodation destination AP determination unit 104 and the neighboring AP information table 105 shown in FIG. 206, the neighboring AP is not automatically selected as in the first embodiment, but the human selects the AP directly on the screen of the communication terminal.
[0142]
The adjacent AP information processing unit 204 receives the access point device information extracted by the MAC layer processing unit 102 from the received AP accommodation information signal, and outputs it to the adjacent AP information display unit 206.
[0143]
The adjacent AP information display unit 206 is a device for visualizing information output from the adjacent AP information processing unit 204, and includes, for example, a liquid crystal display. This display unit displays an identifier (MAC address or aliased identification code) of the access point device, an available transmission rate, an unacceptable state, and the like.
[0144]
The accommodation AP selection input unit 205 refers to the adjacent AP information display unit 206 by a person using wireless communication, and selects and inputs which access point device intentionally accommodates the wireless communication terminal device It is a device that enables For example, a switch, a keyboard, or a mouse.
[0145]
Next, the operation of the wireless communication terminal apparatus having the above configuration will be described.
[0146]
The adjacent AP information processing unit 204 receives the access point device information extracted by the MAC layer processing unit 102 from the received AP accommodation information signal, and displays it on the adjacent AP information display unit 206.
[0147]
The adjacent AP information display unit 206 displays an identifier (MAC address or aliased identification code) of the access point device, an available transmission rate, an unacceptable state, and the like.
[0148]
A person using wireless communication refers to this display, selects which access point apparatus the wireless communication terminal apparatus is accommodated in, and inputs it to the accommodation destination AP selection input unit 205.
[0149]
When an access point device selection input event occurs in the accommodation destination AP selection input unit 205, an input is performed by outputting the identifier of the access point device selected in the accommodation destination AP selection input unit 205 to the MAC layer processing unit 102. Notify event occurrence.
[0150]
Other operations are the same as those in the first embodiment.
[0151]
FIG. 16 illustrates a sequence until the wireless communication terminal device (STN1) according to the present embodiment is accommodated in an adjacent AP when newly entering the network. The basic configuration is the same as that in FIG. 3. In the first embodiment, the part where the apparatus has selected the accommodation destination is selected and input by the person.
[0152]
FIG. 17 shows an example of data displayed on the adjacent AP information display unit 206.
[0153]
STN1 receives the responses from AP1 and AP2, and the adjacent AP information table 105 records that the usable transmission rate of AP1 is 2 Mbps and the usable transmission rate of AP2 is 27 Mbps.
[0154]
In FIG. 17, neither AP1 nor AP2 has yet been accommodated for the communication terminal device, so the result column is blank. When the accommodation process is completed, for example, “impossible” is displayed when the accommodation is impossible, and “possible” is displayed when the accommodation is possible.
[0155]
When a request for accommodation is made to the AP, the message “accepted” or “not allowed” is displayed based on the information included in the accommodation response signal from the access point device.
[0156]
After the adjacent information collection period ends, the STN 1 waits until a human inputs data to the accommodation destination AP selection input unit 205.
[0157]
The user of STN1, for example, can select and input the AP 2 having the larger usable transmission rate field value as the accommodation destination access point device.
[0158]
Thus, according to the present embodiment, since the terminal access point device is selected by the user of the terminal wireless communication terminal device, the processing of the access point device is reduced from the terminal wireless communication terminal device side. It is possible to preferentially use the access point device according to the intention of the user of the wireless communication terminal device.
[0159]
Note that received signal level information of the accommodation information signal from the access point device and error correction processing information can be displayed on the adjacent AP information display unit 206 from the physical layer processing unit 101.
[0160]
For example, in FIG. 14, there are responses from AP1, AP2, and AP3. In AP1, the number of accommodated terminals is 2, the usable transmission rate is 48 Mbps, the number of real-time communication terminals is 1, the transmission rate being used is 6 Mbps, the signal Since the level is A and the error correction process has detected an error, it is indicated that correction has been performed. Here, normalization of AAA, AA, and A is performed from the largest signal level, but the actual level can also be recorded.
[0161]
(Embodiment 3)
FIG. 18 is a block diagram showing an example of a configuration of a radio communication terminal apparatus according to Embodiment 3 of the present invention. Note that this wireless communication terminal apparatus has the same basic configuration as the wireless communication terminal apparatus shown in FIG. 1, and the same components are denoted by the same reference numerals and description thereof is omitted. Here, a case will be described as an example where the wireless communication terminal apparatus according to the present embodiment is a video player, and the scheduled transmission rate is 6 Mbps.
[0162]
The feature of this embodiment is that it further has its own terminal information table 301, and the accommodation destination AP determination unit 104 also refers to the data stored in its own terminal information table 301 when making an AP determination.
[0163]
The own terminal information table 301 is a table that stores information about the wireless communication terminal device itself. For example, as shown in FIG. 19, whether the device is a device that performs real-time communication, or a device that performs real-time communication, Information such as what the transmission speed is used is stored.
[0164]
Next, the operation of the radio communication terminal apparatus according to this embodiment will be described below.
[0165]
After the adjacent information collection period ends, the accommodation destination AP determination unit 104 refers to the adjacent AP information table 105 and the own terminal information table 301. Here, the data included in the adjacent AP information table 105 is assumed to be as shown in FIG.
[0166]
In the adjacent AP information table 105, there are a plurality of entries such as AP1 and AP2. Here, only AP2 has a usable transmission rate of 6 Mbps or more. Therefore, the accommodation destination AP determination unit 104 selects AP2 as the accommodation destination access point device, and instructs the MAC layer processing unit 102.
[0167]
As described above, according to the present embodiment, the access point device that is optimal for the characteristics unique to the wireless communication terminal device is selected by the terminal wireless communication terminal device, so that data can be transferred efficiently and reliably.
[0168]
Note that this embodiment can be combined with Embodiment 2 as shown in FIG.
[0169]
Here, the own terminal information table 301 is provided in the wireless communication terminal device, the data in the own terminal information table 301 is output to the adjacent AP information processing unit 204, and the information shown in FIG. By displaying in accordance with 206, the user of STN1 is clarified how much transmission speed STN1 should request, and provides a judgment material when the user selects an accommodation destination access point device. Can do.
[0170]
(Embodiment 4)
FIG. 21 is a block diagram showing an example of a configuration of a radio communication terminal apparatus according to Embodiment 4 of the present invention. Note that this wireless communication terminal apparatus has the same basic configuration as the wireless communication terminal apparatus shown in FIG. 1, and the same components are denoted by the same reference numerals and description thereof is omitted.
[0171]
The feature of this embodiment is that it further includes a content type instruction unit 401 and that the adjacent AP information table 105 shown in FIG. 1 further includes communication path metrics information.
[0172]
The content type instruction unit 401 receives and records a communication partner identifier, transmission data content information, or reception data content information (real-time data, asynchronous data, and required transmission rate) from an upper layer.
[0173]
The accommodation destination AP determination unit 104 refers to the adjacent AP information table 105 in which the accommodation information transmitted from the adjacent access point device is stored and the content type instruction unit 401, and to which access point device the wireless communication terminal device itself accommodates. Determine if it is optimal to be done.
[0174]
Also, by inserting the data content information in the content type instructing unit 401 into the communication request generation signal, a wireless communication line optimal for communication of each data (how much transmission speed is required, real-time property is required) Therefore, the wireless communication terminal device can request the access point device whether transfer with a certain delay is necessary.
[0175]
As a result, a wireless communication terminal device capable of handling various types of communication data can be used not only for data with a certain unique characteristic, such as voice calls, but also for e-mail, voice, and high-quality moving images. It is possible to select an access point device that can provide an optimal wireless line for various data such as a large-capacity electronic file each time a communication request is generated.
[0176]
Next, a sequence until the wireless communication terminal device (STN2) according to the present embodiment requests the AP to communicate with the communication device (CN1) and the STN2 is accommodated in the adjacent AP is illustrated in FIG. 22 will be used for the explanation. Here, as shown in FIG. 23, a case will be described as an example where AP3, AP4, STN2, router 1, router 2, router 3, CN1, and an external network are located mutually.
[0177]
When a communication request with CN1 is generated in STN2, a communication request generation signal including identifiers of STN2 and CN1 is broadcast or multicast to surrounding access point apparatuses.
[0178]
After transmitting the communication request generation signal, the STN 2 collects the accommodation information signal from the neighboring AP device during the neighboring AP information collection period.
[0179]
In the response signal from the adjacent access point device, for example, the MAC address of the access point device, usable transmission rate (Mbps) information, and the route metrics value in the communication path to CN1, these values are stored. It is recorded in the adjacent AP information table 105.
[0180]
FIG. 24 shows an example of data in the adjacent AP information table 105.
[0181]
STN2 receives the response signals from AP3 and AP4, and adjacent AP information table 105 has AP3 usable transmission rate of 2 Mbps, metrics value of 7, AP4 usable transmission rate of 27 Mbps, and metrics value of 5 It is recorded that.
[0182]
The metric value referred to here is, for example, a value obtained based on an OSPF metric when each access point device searches for a route with the communication device 2. This value may be another routing protocol (for example, RIP).
[0183]
After the adjacent information collection period ends, the STN 2 refers to the adjacent AP information table 105. Since there are a plurality of entries in the adjacent AP information table 105, an AP 4 having a large usable transmission rate field value and a small metric value is selected as the accommodation destination access point device and instructed to the MAC layer processing unit 102. The accommodation destination AP determination unit 104 of the STN 2 determines which access point device should be accommodated. Here, a priority order is provided for each field, and access with good conditions is performed for each field with a higher priority order. The point device is searched, and when only one access point device is selected, it is determined to transmit the accommodation request to the access point device.
[0184]
For example, suppose that STN2 receives accommodation information signals from three access point apparatuses, and the information is shown as in FIG. The accommodation destination priority of STN2 is the order of usable transmission rate and metrics.
[0185]
In FIG. 25, the conditions are good because AP4 and AP5 are higher than the usable transmission rate of 27 Mbps and AP3. At this time, AP4 and AP5 are accommodation destination candidates. Next, when comparing the metrics fields with the highest priority, AP4 is better than AP5 because AP4 is smaller than AP5. As a result, since only one accommodation destination access point device has been selected, it is determined to make an accommodation request to the AP 4. Note that the priority order of each field may be fixed or externally settable.
[0186]
Further, the received signal level information of the accommodation information signal from the access point apparatus and the error correction processing information can be stored in the adjacent AP information table 105 from the physical layer processing unit 101.
[0187]
As described above, according to the present embodiment, since the terminal wireless communication terminal device selects the optimum access point device for the type of data with which the terminal wireless communication terminal device communicates and the route with the communication device that is the communication partner, Transfer can be performed efficiently at high speed.
[0188]
(Embodiment 5)
FIG. 26 is a block diagram showing an example of a configuration of a radio communication terminal apparatus according to Embodiment 5 of the present invention. Note that this wireless communication terminal apparatus has the same basic configuration as that of the wireless communication terminal apparatus shown in FIG. 15, and the same components are denoted by the same reference numerals and description thereof is omitted.
[0189]
The feature of the present embodiment is that it further includes a content type instruction unit 401 and that the adjacent AP information processing unit 204 shown in FIG. 2 further includes communication path metrics information.
[0190]
The adjacent AP information processing unit 204 receives the access point device information extracted by the MAC layer processing unit 102 from the received AP accommodation information signal, and outputs the information to the adjacent AP information display unit 206 for display. Information related to communication data output from the content type instruction unit 401 is also output to the adjacent AP information display unit 206 for display.
[0191]
The adjacent AP information display unit 206 visualizes the information and data content information output from the adjacent AP information processing unit 204. This display unit includes an identifier of the access point device (MAC address or aliased identification code), usable transmission speed, metrics value to the communication partner device, data content information (real-time data, asynchronous data, and required) (Transmission speed) and the status of “acceptable” and “impossible” are displayed.
[0192]
FIG. 27 illustrates a sequence until a wireless communication terminal device that has generated a communication request is accommodated in an adjacent AP. Here, a case where AP3, AP4, STN2, router 1, router 2, router 3, CN1, and an external network are located as shown in FIG. 23 will be described.
[0193]
When a communication request with CN1 is generated in STN2, a communication request generation signal including identifiers of STN2 and CN1 is broadcast or multicasted to surrounding access point devices. After transmitting the communication request generation signal, the STN 2 collects an accommodation information signal that is a response from an adjacent AP for a certain period. This is the adjacent AP information collection period. The response signal from the adjacent access point device stores, for example, the MAC address of the access point device, usable transmission rate (Mbps) information, and route metrics values up to CN1, and these values are stored in the MAC layer processing unit 102. The information is displayed on the adjacent AP information display unit 206 via the adjacent AP information processing unit 204.
[0194]
FIG. 28 shows an example of data displayed on the adjacent AP information display unit 206.
[0195]
STN2 receives the responses from AP3 and AP4, and neighboring AP information table 105 has AP3 usable transmission rate of 2 Mbps, metrics value of 7, AP4 usable transmission rate of 27 Mbps, and metrics value of 5. It is recorded that there is. Since AP3 and AP4 have not been accommodated, the result is blank. When the accommodation request is made, it is visualized that the accommodation is “acceptable” and the accommodation “impossible” based on the signal included in the accommodation response signal from the access point device.
[0196]
The metric value referred to here is, for example, a value obtained based on an OSPF metric when each access point device searches for a route with the communication device 2. This value may be another routing protocol (for example, RIP).
[0197]
After the adjacent information collection period ends, the STN 2 waits for an input from the accommodation destination AP selection input unit 205. The user of the STN 2 selects, for example, the AP 4 having a small metric value as the accommodation destination access point device, and instructs the adjacent AP information processing unit 204 by inputting it. The adjacent AP information processing unit 204 instructs the MAC layer processing unit 102 to generate an accommodation request signal for the AP 4 selected by the accommodation destination AP selection input unit 205.
[0198]
The MAC layer processing unit 102 generates an accommodation request signal for the AP 4 designated by the accommodation destination AP input device, and transfers it to the physical layer processing unit 101 when acquiring the access right to the wireless medium by a predetermined access attempt.
[0199]
The physical layer processing unit 101 converts the accommodation request signal into a radio signal, transmits the accommodation request signal from the antenna 110 to the AP 4, and waits for the accommodation response signal from the AP 4. The STN 2 receives the accommodation response signal from the AP 4, analyzes the signal in the MAC layer processing unit 102, and when information indicating that the accommodation is possible is obtained in the AP 4, the accommodation process is completed, and the data transmission / reception standby state become. When accommodation is rejected in the AP 4, the access point device selection procedure is performed by waiting for input from the accommodation destination AP selection input unit 205 or generating a communication request generation signal again, collecting information on adjacent access point devices. Either process.
[0200]
Thus, according to the present embodiment, since the terminal access point device is selected by the user of the terminal wireless communication terminal device, the processing of the access point device is reduced from the terminal wireless communication terminal device side. In addition, it is possible to preferentially select an access point device according to the intention of the user of the wireless communication terminal device.
[0201]
Here, the case where the information from the access point device is only the MAC address of the access point device and the usable transmission speed has been described as an example, but the number of terminals accommodated by the access point device, The address, the transmission rate used by each, the number of terminals performing real-time communication among the terminals, the transmission rate used by each, and the like may be used.
[0202]
In addition, the received signal level information of the accommodation information signal from the access point device and the error correction processing information can be displayed on the adjacent AP information display unit 206 from the physical layer processing unit 101.
[0203]
(Embodiment 6)
FIG. 29 is a block diagram showing an example of a configuration of a wireless communication terminal apparatus according to Embodiment 6 of the present invention. This wireless communication terminal apparatus has a configuration in which the wireless communication terminal apparatus shown in FIG. 21 and the wireless communication terminal apparatus shown in FIG. 26 are combined, and the same components are denoted by the same reference numerals. Description is omitted.
[0204]
The MAC layer processing unit 102 adds a MAC frame header to the transmission data output from the upper layer processing unit 103, receives a wireless media access right by performing a predetermined access attempt, and receives the physical layer processing unit 101. A process of passing and a process of receiving a digital signal output from the physical layer processing unit 101, and a process of passing to the upper layer processing unit 103 when an upper layer protocol data unit (PDU) such as IP is included. Do.
[0205]
A communication request generation signal including an identifier of the wireless communication terminal device and an identifier of a communication device that is a communication partner when communication is started and when an instruction of no appropriate AP is received from the accommodation destination AP determination unit 104 Is generated, and when a predetermined access trial is performed and an access right to the wireless medium is obtained, a process of passing to the physical layer processing unit 101 is performed.
[0206]
When the accommodation destination AP identifier is instructed from the accommodation destination AP determination unit 104, an accommodation request signal including an accommodation destination AP identifier, an identifier of the wireless communication terminal device, a scheduled transmission rate, and the like is generated, And when the access right to the wireless medium is obtained, the physical layer processing unit 101 is transferred.
[0207]
When the accommodation information signal transmitted by the adjacent access point device is received from the physical layer processing unit 101, the access point device information extracted from the accommodation information signal is transferred and recorded in the adjacent AP information table 105, and the access point The device information is transferred to the adjacent AP information processing unit 204, and further, a determination request is issued to the accommodation destination AP determination unit 104.
[0208]
When the accommodation response signal is received from the physical layer processing unit 101 and there is an accommodation permission indicator in the accommodation response signal, it is determined that the accommodation request to the predetermined access point device is completed, and data transmission / reception is performed. It will be in a standby state. If there is an unaccommodable indicator, the non-accommodable indicator is handed over to the adjacent AP information processing unit 204 and a redetermination request is issued to the accommodation destination AP determination unit 104 to wait for a determination from the accommodation destination AP determination unit 104. .
[0209]
When receiving the determination request from the MAC layer processing unit 102, the accommodation destination AP determination unit 104 refers to the adjacent AP information table 105 based on information obtained from the content type instruction unit 401, and the wireless communication terminal device It is determined which access point device should be accommodated, and a process of giving an instruction to generate an accommodation request signal by delivering the accommodation destination AP identifier to the MAC layer processing unit 102 is performed.
[0210]
Further, when the adjacent AP information processing unit 204 is notified that an input event has occurred in the accommodation destination AP selection input unit 205, an instruction to deliver the accommodation destination AP identifier to the MAC layer processing unit 102 and generate an accommodation request signal Process to do.
[0211]
The processing for instructing to generate the two accommodation request signals may be performed in parallel, but which processing is preferentially performed can be changed in the wireless communication terminal device. In the present embodiment, priority is given to a case where the latter is notified that an input event has occurred in the accommodation destination AP selection input unit 205.
[0212]
When there is no access point device suitable for accommodating the wireless communication terminal device, and when the communication request generation signal is transmitted until the next communication request generation signal transmission, the same access point device is requested for the predetermined number of times. When a request for redetermination is received from the MAC layer processing unit 102 after instructing the signal generation to the MAC layer processing unit 102, and there is no other access point device that can be determined to be accommodated in the adjacent AP information table 105, a certain interval (For example, 10 sec) is set, the MAC layer processing unit 102 is notified that there is no appropriate access point device, and a process of instructing generation / transmission of a new entry signal is performed again.
[0213]
Here, the predetermined number of times is normally set to one time, but can be changed to three times when it is desired to repeat the request for the same access point device.
[0214]
The adjacent AP information processing unit 204 receives the access point device information extracted in the MAC layer processing unit 102 from the received AP accommodation information signal, and outputs it from the content type instruction unit 401 for displaying on the adjacent AP information display unit 206. When an input event for selecting an access point device occurs in the accommodation destination AP selection input unit 205, the accommodation destination AP selection input unit 205 causes the accommodation destination AP selection input unit 205 to A process of notifying the occurrence of an input event is performed by passing the identifier of the selected access point device.
[0215]
As described above, according to the present embodiment, since the terminal wireless communication terminal device selects the optimum access point device for the type of data with which the terminal wireless communication terminal device communicates and the route with the communication device that is the communication partner, Transfer can be performed efficiently at high speed. In addition, since the terminal access point device can be selected by the user of the terminal wireless communication terminal device, the processing of the access point device from the terminal wireless communication terminal device side can be reduced, and transfer efficiency and cost priority can be reduced. For example, it is possible to preferentially select an access point device according to the intention of the user of the wireless communication terminal device.
[0216]
(Embodiment 7)
FIG. 30 is a block diagram showing an example of a configuration of a wireless communication terminal apparatus according to Embodiment 7 of the present invention. Note that this wireless communication terminal apparatus has the same basic configuration as the wireless communication terminal apparatus shown in FIG. 29, and the same components are denoted by the same reference numerals and description thereof is omitted.
[0217]
The feature of this embodiment is that it further includes a wireless environment monitoring unit 701.
[0218]
The wireless environment monitoring unit 701 collects the reception level of data received by the physical layer processing unit 101 and the frame error rate (FER) information of demodulated data while the wireless communication terminal device is performing data communication. Then, this data is transferred to the adjacent AP information processing unit 204, and when the wireless environment deteriorates, the wireless environment deterioration indicator is transferred to the accommodation destination AP determination unit 104.
[0219]
The adjacent AP information processing unit 204 receives the wireless environment information from the wireless environment monitoring unit 701 in addition to the matters described in the sixth embodiment, and delivers the information to the adjacent AP information display unit 206.
[0220]
The adjacent AP information display unit 206 displays wireless environment information with the access point apparatus that is performing communication in addition to the items described in the sixth embodiment.
[0221]
When receiving a determination request from the MAC layer processing unit 102, the accommodation destination AP determination unit 104 refers to the adjacent AP information table 105 based on information obtained from the content type instruction unit 401, and the wireless communication terminal device It is determined which access point device should be accommodated, and a process of giving an instruction to generate an accommodation request signal by delivering the accommodation destination AP identifier to the MAC layer processing unit 102 is performed. An example of the determination method is as described in the fourth embodiment. When receiving the wireless environment deterioration indicator from the wireless environment monitoring unit 701, it is determined which access point device the wireless communication terminal device should be accommodated from among the access point devices different from the currently accommodated access point device. A process of determining, delivering the accommodation destination AP identifier to the MAC layer processing unit 102, and instructing generation of an accommodation request signal is performed. An example of the determination method is as described in the fourth embodiment.
[0222]
In addition, when the adjacent AP information processing unit 204 is notified that an input event has occurred in the accommodation destination AP selection input unit 205, an instruction to deliver the accommodation destination AP identifier to the MAC layer processing unit 102 and generate an accommodation request signal Process to do.
[0223]
The process of instructing the MAC processing unit to generate the accommodation request signal when an input event occurs in the accommodation destination AP selection input unit 205 is in parallel with the process of instructing to generate the other two accommodation request signals. Although it may be performed, which processing is preferentially performed can be changed in the wireless communication terminal device. In this embodiment, priority is given to a case where the accommodation destination AP selection input unit 205 is notified that an input event has occurred.
[0224]
FIG. 31 shows a flow of processing performed in STN2 when the wireless environment deteriorates while STN2 and CN1 are communicating via AP4.
[0225]
If the wireless environment deteriorates during data communication, that is, if the FER increases based on the data collected in the wireless environment monitoring unit 701 (ST7100), or the FER does not increase, but the received signal level (RSSI) ) Has deteriorated significantly (ST7110), communication with the communication device 2 is temporarily interrupted (ST7200).
[0226]
The wireless environment monitoring unit 701 issues a wireless environment deterioration indicator to the accommodation destination AP determination unit 104, and the accommodation destination AP determination unit 104 that has received the wireless environment deterioration indicator, except for the current access point device, It is determined whether there is an appropriate access point device (ST7300).
[0227]
An example of this determination method is as described in the fourth embodiment. If there is an appropriate access point apparatus, the mobile terminal makes a transition to step ST7400 for generating an accommodation request signal.
[0228]
FIG. 32 is a sequence example when there is no appropriate access point device.
[0229]
When there is no appropriate access point device, an indicator without an appropriate AP is passed to the MAC layer processing unit 102, and the MAC layer processing unit 102 generates an adjacent AP information request signal (ST7310) and uses it in the system. The signal is prepared for transmission using a predetermined access algorithm.
[0230]
Here, media access is performed by CSMA / CA used in IEEE 802.11 as an example. When carrier free is detected by CSMA / CA (ST7320), an adjacent AP information request signal is multicast or broadcast to surrounding access point apparatuses from physical layer processing section 101 via antenna 110 (ST7330).
[0231]
STN 2 waits for an AP accommodation information signal from an adjacent access point apparatus for a certain period (ST 7340). When at least one AP accommodation information signal is successfully received and the accommodation destination AP determination unit 104 determines that there is an accommodable access point device (ST7350), and the accommodation destination access point device is selected, the MAC layer An accommodation request signal is generated in processing section 102 (ST7400), and when carrier free is detected by a predetermined access method (ST7500), the accommodation request signal is transmitted from physical layer processing section 101 via antenna 110 (ST7600).
[0232]
In FIG. 32, there are responses from AP3 and AP4, but since AP3 is selected as the accommodation destination access point device based on the contents of the AP accommodation information signal, STN2 sends an accommodation request signal to AP3. Yes. If it is determined in step ST7350 that there is an accommodable access point device, if necessary, an interval of a certain period (for example, 10 sec) is set, and an indicator without an appropriate AP is given to the MAC layer processing unit 102. Then, the process proceeds to adjacent AP information request signal generation step ST7310 again.
[0233]
In addition, when it is determined that there is no accommodation response signal after transmitting the accommodation request signal (ST7700), the process proceeds to determination step ST7710 of the number of times the accommodation response signal is continuously transmitted. Returning again to the accommodation request signal generation step ST7400, an attempt is made to transmit the same accommodation request signal. If the accommodation point access point device cannot be selected even if the accommodation response signal is continuously transmitted N times, an interval of a certain period (for example, 10 sec) is set and an indicator without an appropriate AP is given to the MAC layer processing unit 102. Then, the process proceeds to adjacent AP information request signal generation step ST7310 again. The number N of trials can be changed by the wireless communication terminal device.
[0234]
In Step ST7700, when an accommodation response signal including an accommodation indicator is received, communication is resumed assuming that the accommodation procedure is completed. If an accommodation response signal including an unacceptable directive is received, the mobile terminal makes a transition to step ST7710. In FIG. 32, since STN2 has received the accommodation response signal from AP3, STN2 resumes communication with CN1 via AP3.
[0235]
If an accommodation destination AP selection input event occurs (ST7410), an accommodation request signal is generated in the accommodation destination AP determination unit 104 by an interrupt notification, and an access right is given by the MAC layer processing unit 102 by a predetermined access method. Once acquired, it can be transferred to the physical layer processing unit 101. At this time, if the MAC layer processing unit 102 has an accommodation request signal waiting for access right acquisition automatically generated by the accommodation destination AP determination unit 104, it is replaced with the accommodation request signal generated due to the accommodation destination AP selection input event. (ST7420). The subsequent steps are as described above.
[0236]
As described above, according to this embodiment, when the wireless environment between the wireless communication terminal device and the access point device changes while the wireless communication terminal device is communicating with an arbitrary communication device, the optimum access point is obtained. Since the device is selected again, data transfer during communication can be performed more reliably and efficiently.
[0237]
(Embodiment 8)
FIG. 33 is a block diagram showing an example of the configuration of the access point apparatus according to Embodiment 8 of the present invention.
[0238]
33 includes an end host physical layer processing unit 801, an end host accommodation processing unit 802, a metrics request signal transmission processing unit 803, a metrics response signal reception processing unit 804, a bridging processing unit 805, and a network side physical layer. A processing unit 806, an accommodation terminal information table 807, and a metrics table 808 are included.
[0239]
The end host physical layer processing unit 801 receives and demodulates radio signals such as an accommodation request signal, an adjacent AP information request signal, and a communication request generation signal from the radio communication terminal device described in the first to seventh embodiments. The data is converted into digital data and transferred to the bridging processing unit 805.
[0240]
In addition, the end host physical layer processing unit 801 modulates the AP accommodation information signal, the accommodation response signal, and the relay data from the external network output from the bridging processing unit 805, converts the data into a radio signal, and transmits the antenna 810. Perform more radiation processing.
[0241]
When receiving an adjacent AP information request signal or a communication request generation signal from the bridging processing unit 805, the end host accommodation processing unit 802 refers to the accommodation terminal information table 807 and the metrics table 808, and this access point device accommodates AP accommodation information including the number of wireless communication terminal devices in use, usable transmission speed, route metric to the communication device serving as a communication partner, and the like are generated and output to bridging processing section 805.
[0242]
Further, when the end host accommodation processing unit 802 receives the communication request generation signal and refers to the metrics table 808, if there is no metrics value for the wireless communication terminal device that performs communication, the end host accommodation processing unit 802 sends the metrics request signal transmission processing unit 803 to A metrics request signal generation request is made by notifying the address of the destination communication device.
[0243]
Further, when the end host accommodation processing unit 802 receives the accommodation processing request signal from the bridging processing unit 805, the end host accommodation processing unit 802 can be calculated from the scheduled transmission rate and accommodation terminal information table 807 included in the accommodation processing request signal. Compare transmission rates. And if the former is less than the latter, it is determined that the wireless communication terminal device can be accommodated, and from the accommodation processing request signal, information such as the identifier of the wireless communication terminal device that is the transmission source and the scheduled transmission rate is extracted, Stored in the accommodation terminal information table 807. In addition, an accommodation response signal including an accommodable indicator is generated for the wireless communication terminal device that is the transmission source of the accommodation processing request signal, and is output to the bridging processing unit 805.
[0244]
In the above case, when the former is greater than the latter, the end host accommodation processing unit 802 determines that the wireless communication terminal device cannot be accommodated, and generates an accommodation response signal including an accommodation impossible indicator. The data is output to the bridging processing unit 805. If accommodation is not possible, the accommodation request may not be generated and the accommodation request may be ignored.
[0245]
The metrics request signal transmission processing unit 803 receives the address of the destination communication device of the wireless communication terminal device from the end host accommodation processing unit 802, thereby searching for the route to the communication device, the route cost, the number of hops, and the delay A metrics request signal for obtaining route metrics information such as quantity is generated and output to the bridging processing unit 805.
[0246]
The metrics response signal reception processing unit 804 receives the metrics response signal from the bridging processing unit 805, extracts the communication device address and metrics information included in the metrics response signal, and stores them in the metric table.
[0247]
The bridging processing unit 805 is a radio communication such as a signal to relay the digital signal output from the end host physical layer processing unit 801 to an external network, or an accommodation request signal / adjacent AP information request signal / communication request generation signal. Separated into signals used for terminal device accommodation. When the access right is obtained using the access algorithm of the external network, the former is transferred to the network side physical layer processing unit 806, and the latter is transferred to the end host accommodation processing unit 802. Also, when an access right is obtained using an access algorithm of the external network, the metrics request signal output from the metrics request signal transmission processing unit 803 is transferred to the network side physical layer processing unit 806.
[0248]
Further, the bridging processing unit 805 separates the digital signal output from the network side physical layer processing unit 806 into a signal to be relayed to the wireless communication terminal device or a metrics response signal, and accesses on the wireless communication terminal device side When the access right is obtained using the algorithm, the former is transferred to the end host physical layer processing unit 801 and the latter is transferred to the metrics response signal reception processing unit 804. When the access right is obtained using the access algorithm on the wireless communication terminal device side, the AP accommodation information signal and the accommodation response signal output from the end host accommodation processing unit 802 are transferred to the end host physical layer processing unit 801.
[0249]
The access algorithm on the wireless communication terminal side is, for example, the CSMA / CA system, TDMA system, CDMA system, etc. used in IEEE 802.11. The access algorithm of the external network depends on the network, and is, for example, ATM system, CSMA / CD system, CSMA / CA system, TDMA system, FDMA system, or CDMA system.
[0250]
The network side physical layer processing unit 806 receives a signal from an external network, demodulates it, converts it into digital data, passes it to the bridging processing unit 805, and outputs the external network output from the bridging processing unit 805. A signal to be relayed and a metrics request signal are modulated, and the signal is transmitted in a format corresponding to the physical medium used in the external network.
[0251]
The accommodation terminal information table 807 receives and records accommodation wireless communication terminal device information such as an identifier of the wireless communication terminal device and a scheduled transmission rate when the end host accommodation processing unit 802 performs reception processing of the accommodation request signal.
[0252]
FIG. 34 shows an example of data recorded in the accommodation terminal information table 807.
[0253]
The accommodated terminal field is the identifier of the accommodated wireless communication terminal apparatus, the used transmission rate field is an estimate of the amount of data transmitted (received) by the accommodated terminal (Mbps), and the real-time communication field is the real-time property of the wireless communication terminal apparatus Is an indicator of whether or not to perform data communication. If the data from the wireless communication terminal device (or to the wireless communication terminal device) included in the accommodated terminal information table 807 does not reach the access point device for a certain period (for example, 10 minutes), the accommodated terminal information table 807 can be deleted. This period can be changed.
[0254]
The metrics table 808 receives and records a communication device identifier, metrics information, and the like when the metrics response signal reception processing unit 804 performs a metrics response signal reception process.
[0255]
FIG. 35 shows an example of the metrics table 808. In the metric field, the cost field is the cost of the route, the hop field is the number of routers passing through the route, and the delay field is a metric value of the delay amount of the route. Here, the smaller the value, the better the condition.
[0256]
FIG. 36 shows a flow from when an access point apparatus receives a communication request generation signal transmitted by a wireless communication terminal apparatus or an adjacent AP information request signal to when the accommodation process is completed and an idle (waiting for transfer data) state is entered. Is shown. When the access point device receives the communication request generation signal or the adjacent AP information request signal (ST8100), the access point device refers to the metrics table 808, and in the table, the effective communication device that is the communication partner of the wireless communication terminal device is valid. It is checked whether or not data exists (ST8200).
[0257]
If there is no valid information in the table, the process proceeds to metrics request trial count determination step ST8210, and if present, the process proceeds to AP accommodation information signal generation step ST8300. In the former case, if the number of metric request attempts is N or more, it is considered that there is no route to the communication device, and the accommodation processing of the wireless communication terminal device is not performed, and the idle state is entered (ST8700). If it is less than N times, a metrics request signal is generated (ST 8220), and an access right acquisition attempt is made using an access algorithm of the external network (ST 8230).
[0258]
The number of metrics request attempts should be a value according to the network system, and can be changed. Here, N = 3. If the access right cannot be obtained even after a predetermined number of attempts to acquire the access right (ST8240), it is assumed that there is no effective route to the communication device, and the wireless communication terminal device is not accommodated and enters an idle state. (ST8700).
[0259]
The maximum number of access right acquisition attempts should be a value according to the network system, and can be changed. Here, the maximum number of times = 5. If the access right is obtained, a metrics request signal is transmitted, timer 1 is started (ST8250), and a metrics response signal is awaited. When the metrics response signal is received before the timer 1 times out (ST8260) (ST8280), metrics information such as the communication device address and metrics value is stored in the metrics table 808 in the metrics table 808 (ST8290), and the AP accommodation information signal The process proceeds to the generation step (ST8300).
[0260]
When the metrics table 808 has corresponding information to the communication device, or when the route search by receiving the metrics response signal is completed, the AP accommodation information signal is referred to the metrics table 808 and the accommodation terminal information table 807. Is generated (ST8300), and an access right acquisition attempt is performed using an access algorithm on the wireless communication terminal side (ST8400).
[0261]
If the access right cannot be obtained even after trying the maximum number of access right acquisition attempts, it is determined that effective communication with the wireless communication terminal device is impossible (ST8410), and the accommodation information of the wireless communication terminal device is transmitted. Processing is not performed, and an idle state is entered (ST8700). The maximum number of access right acquisition attempts should be a value corresponding to the system on the wireless communication terminal device side, and can be changed. Here, the maximum value = 5. When the access right is obtained, the AP accommodation information signal is transmitted from the end host physical layer processing unit 801, the timer 2 is started (ST8500), and the accommodation request signal is waited.
[0262]
When the accommodation request signal is received before the timer 2 times out (ST8600) (ST8610), the transmission source and the requested scheduled transmission rate are extracted from the accommodation request signal, and the accommodation terminal information table 807 is referred to It is determined whether or not the access point can accommodate (ST8620).
[0263]
The access point device adds up the scheduled transmission rates recorded in the used transmission rate field of the accommodated terminal information table 807 to determine how much communication request is generated by the currently accommodated wireless communication terminal device. It is determined whether or not accommodation is possible by comparing whether the difference between the estimation and the network capacity (maximum usable transmission rate) on the wireless communication terminal device side satisfies the accommodation request.
[0264]
If it is determined in ST8620 that accommodation is possible, accommodation terminal information such as the corresponding accommodation terminal address and scheduled transmission speed is recorded in the accommodation terminal information table 807 (ST8630), and an accommodation response signal indicating that accommodation is possible is received. Generated. Thereafter, as in ST8400, an access right acquisition attempt is made (ST8640). When the access right is acquired, an accommodation response signal is transmitted to the wireless communication terminal (ST8660), transitions to an idle state (ST8700), and waits for reception of data to be transferred.
[0265]
Here, an example is given in which the accommodation response signal is generated only when accommodation is possible. However, even if it is estimated that accommodation of the wireless communication terminal that transmitted the accommodation request signal is impossible, accommodation indicating that accommodation is not possible A response signal may be generated and transmitted to the wireless communication terminal device.
[0266]
Thus, according to the present embodiment, the access point device notifies the wireless communication terminal device of route information with the communication device that is the communication counterpart in response to a communication request from the wireless communication terminal device. The device can select the optimum accommodation destination access point device according to factors such as communication cost, usable transmission speed, transmission delay, etc., and can perform data transfer suitable for the characteristics of the terminal wireless communication terminal device it can.
[0267]
Also, in the access point device, it is possible to aggregate the communication cost using the amount of data flowing between the wireless communication terminal device and the communication device that is the communication partner and the metric value. Information can be obtained, and a user can be charged for the wireless communication terminal device.
[0268]
(Embodiment 9)
FIG. 37 is a block diagram showing an example of the configuration of the access point apparatus according to Embodiment 9 of the present invention. This access point device has the same basic configuration as that of the access point device shown in FIG. 33, and the same components are denoted by the same reference numerals and the description thereof is omitted.
[0269]
The feature of this embodiment is that it is optimally configured when accommodating the wireless communication terminal devices of the first to third embodiments. A wireless communication terminal apparatus that does not require a route metric value like the wireless communication terminal apparatuses described in the first to third embodiments is accommodated. FIG. 38 shows a flow from when the access point device receives the new entry signal transmitted by the wireless communication terminal device to when the accommodation process is completed and the idle (waiting for transfer data) state is entered.
[0270]
This access point apparatus can take a configuration in which the metrics request signal transmission processing unit 803, the metrics response signal reception processing unit 804, and the metrics table 808 of the access point apparatus in FIG. 33 are omitted, and the functions of the respective blocks are implemented. It is as described in Form 8.
[0271]
The flow shown in FIG. 38 is obtained by omitting ST8200, 8210, and 8220 to 8290 in FIG. 36. The same steps are denoted by the same reference numerals, and the description thereof is omitted.
[0272]
As described above, according to the present embodiment, the access point device transmits and receives the control signal for selecting the optimum access point device for transmitting real-time data by the terminal wireless communication terminal device. Data transfer delay can be greatly reduced.
[0273]
In addition, it is also possible to store the scheduled transmission rate in the new entry signal, the communication request generation signal, and the adjacent AP information request signal described in the first to seventh embodiments. In this case, if the end host accommodation processing unit 802 of the access point device described in Embodiments 8 to 9 determines that the access point device cannot accept the accommodation request for the wireless communication terminal device, that is, the accommodation terminal. The total scheduled transmission rate of each wireless communication terminal device recorded in the information table 807 and the planned scheduled transmission rate when a new entry signal, a communication request generation signal, or an adjacent AP information request signal is newly received. If the sum exceeds the usable transmission rate of the access point apparatus, the execution of a predetermined procedure relating to accommodation of the wireless communication terminal apparatus is omitted. That is, processing for generating AP accommodation information and delivering it to the bridging processing unit 805 and delivering a metrics request signal generation request to the metrics request signal transmission processing unit 803 are not performed. As a result, it is possible to reduce the processing of the access point device and reduce the network load in the wireless section.
[0274]
【The invention's effect】
As described above, according to the present invention, when the terminal wireless communication terminal apparatus receives the accommodation terminal information from the access point apparatus, an optimum access point apparatus for the wireless communication terminal apparatus to perform communication is provided. The access point apparatus can be selected, and the processing load of the access point apparatus can be distributed, and the traffic in the wireless network can be distributed. Thus, the real-time data transfer delay can be greatly reduced.
[0275]
In addition, the terminal wireless communication terminal selects the access point to be accommodated from the route information with the counterpart communication device and the accommodated terminal information of the access point device, so communication is low in load, low delay, and low cost. A great effect is obtained that it is possible to designate an access point that can be performed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of a configuration of a radio communication terminal apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a flowchart showing a processing procedure of the radio communication terminal apparatus according to Embodiment 1 of the present invention.
FIG. 3 is a diagram showing a sequence until a wireless communication terminal apparatus newly entered in the wireless communication terminal apparatus according to Embodiment 1 of the present invention is accommodated in an adjacent access point apparatus;
FIG. 4 is a diagram showing an arrangement example of radio communication terminal apparatuses and access point apparatuses according to Embodiment 1 of the present invention;
FIG. 5 is a diagram showing data in an adjacent AP information table in the wireless communication terminal apparatus according to Embodiment 1 of the present invention.
FIG. 6 is a diagram showing an example of a frame structure of a new entry signal
FIG. 7 is a diagram illustrating the Frame Control field in detail.
FIG. 8 is a diagram illustrating an example of a frame structure of a new entry signal
FIG. 9 is a diagram illustrating an example of a frame configuration of an AP accommodation information signal
FIG. 10 is a diagram illustrating an example of a frame configuration of an AP accommodation information signal
FIG. 11 is a diagram illustrating an example of a frame configuration of an AP accommodation information signal
FIG. 12 is a diagram illustrating an example of a frame configuration of an accommodation request signal
FIG. 13 is a diagram illustrating an example of a frame configuration of an accommodation response signal
FIG. 14 is a diagram showing data in an adjacent AP information table in the wireless communication terminal apparatus according to Embodiment 1 of the present invention;
FIG. 15 is a block diagram showing an example of a configuration of a wireless communication terminal apparatus according to Embodiment 2 of the present invention.
FIG. 16 is a diagram showing a sequence until a wireless communication terminal apparatus newly entered in the wireless communication terminal apparatus according to Embodiment 2 of the present invention is accommodated in an adjacent access point apparatus;
FIG. 17 is a diagram showing data in an adjacent AP information table in the wireless communication terminal apparatus according to Embodiment 2 of the present invention;
FIG. 18 is a block diagram showing an example of a configuration of a wireless communication terminal apparatus according to Embodiment 3 of the present invention.
FIG. 19 is a diagram showing an example of a local terminal information table in the wireless communication terminal apparatus according to Embodiment 3 of the present invention.
FIG. 20 is a block diagram showing another configuration of the radio communication terminal apparatus according to Embodiment 3 of the present invention;
FIG. 21 is a block diagram showing an example of a configuration of a wireless communication terminal apparatus according to Embodiment 4 of the present invention.
FIG. 22 is a diagram showing a sequence until a wireless communication terminal apparatus that has made a communication request in the wireless communication terminal apparatus according to Embodiment 4 of the present invention is accommodated in an adjacent access point apparatus;
FIG. 23 is a diagram showing an arrangement example of a wireless communication terminal device, an access point device, a router, and a counterpart communication device according to Embodiment 4 of the present invention
FIG. 24 is a diagram showing an example of data in an adjacent AP information table in the wireless communication terminal apparatus according to Embodiment 4 of the present invention.
FIG. 25 is a diagram showing another example of data in the adjacent AP information table in the wireless communication terminal apparatus according to Embodiment 4 of the present invention;
FIG. 26 is a block diagram showing an example of a configuration of a wireless communication terminal apparatus according to Embodiment 5 of the present invention.
FIG. 27 is a diagram showing a sequence until a wireless communication terminal apparatus that has made a communication request in the wireless communication terminal apparatus according to Embodiment 5 of the present invention is accommodated in an adjacent access point apparatus;
FIG. 28 is a diagram showing an example of information in an adjacent AP information table in the wireless communication terminal apparatus according to Embodiment 5 of the present invention;
FIG. 29 is a block diagram showing an example of a configuration of a wireless communication terminal apparatus according to Embodiment 6 of the present invention.
FIG. 30 is a block diagram showing an example of a configuration of a radio communication terminal apparatus according to Embodiment 7 of the present invention.
FIG. 31 shows a flow of operations of a radio communication terminal apparatus when a radio environment between the radio communication terminal apparatus and a destination access point apparatus deteriorates in the radio communication terminal apparatus according to Embodiment 7 of the present invention; Illustration
FIG. 32 is a diagram showing a sequence when the wireless environment between the wireless communication terminal device and the accommodation point access point device deteriorates in the wireless communication terminal device according to Embodiment 7 of the present invention;
FIG. 33 is a block diagram showing an example of a configuration of an access point apparatus according to Embodiment 8 of the present invention.
FIG. 34 is a diagram showing an example of an accommodation terminal information table in the access point device according to Embodiment 8 of the present invention.
FIG. 35 is a diagram showing an example of a metrics table in the access point apparatus according to Embodiment 8 of the present invention;
FIG. 36 is a view showing an operation flow of the access point apparatus according to Embodiment 8 of the present invention;
FIG. 37 is a block diagram showing an example of the configuration of an access point apparatus according to Embodiment 9 of the present invention.
FIG. 38 is a diagram showing an operation flow of the access point apparatus according to the ninth embodiment of the present invention.
FIG. 39 is a diagram showing an example of a conventional network configuration
[Explanation of symbols]
101 Physical layer processing unit
102 MAC layer processing unit
103 Upper layer processing section
104 Accommodation AP determination unit
105 Neighbor AP information table
204 Adjacent AP information processing unit
205 Accommodation AP selection input section
206 Adjacent AP information display section
301 Self-terminal information table
401 Content type instruction section
701 Wireless environment monitoring unit
801 End host physical layer processing unit
802 End host accommodation processing section
803 Metrics request signal transmission processing unit
804 Metrics response signal reception processing unit
805 Bridging processing unit
806 Network side physical layer processing unit
807 Accommodating terminal information table
808 Metrics table

Claims (10)

A wireless communication terminal device that communicates with another communication device by connecting to any relay station using wireless communication ,
A communication means for transmitting a communication request signal for requesting system load information related to a load of the communication system to a relay station in a communication range when newly entering the network;
From the relay station in the communication range, receiving the terminal number and acquires the system load information including the number of real-time communication terminal, and acquisition means for storing the neighbor AP information table,
Selection means for selecting a relay station to be connected based on the system load information of each adjacent relay station stored in the adjacent AP information table obtained by the acquisition means;
A wireless communication terminal apparatus comprising: The system load information is
The wireless communication terminal apparatus according to claim 1, further comprising at least one of an available transmission rate, a usable transmission rate, and a wireless signal level. A wireless communication relay device that performs relay when the terminal device communicates with another communication device by connecting to the terminal device using wireless communication ,
The terminal device
When newly entering the network, having a communication means for transmitting a communication request signal for requesting system load information regarding the load of the communication system to the wireless relay device in the communication range,
Based on the system load information including the number of accommodated terminals and the number of real-time communication terminals received from the wireless communication relay device, select the accommodation destination wireless communication relay device,
A wireless communication relay device, wherein when the terminal device requests system load information including the number of accommodated terminals and the number of real-time communication terminals regarding the load of the communication system, the information is output. The system load information is
4. The wireless communication relay device according to claim 3, further comprising at least one of a usable transmission rate, a usable transmission rate, and a wireless signal level. In a network composed of at least one wireless communication terminal device, the wireless communication terminal device, and a wireless communication relay device that performs bridging for connecting a local area network or a backbone network,
The wireless communication terminal device
When entering the new network, a signal requesting the wireless communication terminal apparatus that accommodates the radio communication relay device around, accommodating the terminal number and the transmission of the accommodation information including the number of real-time communication terminal to the radio communication repeater Means for transmitting;
Means for receiving a signal of the accommodation information transmitted from the wireless communication relay device;
Means for recording the accommodation information;
Means for recording characteristic information of the wireless communication terminal device;
Means for selecting a wireless communication relay device of the accommodation destination based on the accommodation information and the characteristic information of the wireless communication terminal device;
Means for transmitting a signal requesting accommodation to the wireless communication relay device selected by means for selecting the wireless communication relay device of the accommodation destination;
Means for receiving an accommodation response signal transmitted from a destination wireless communication relay device of the signal requesting accommodation;
A wireless communication terminal apparatus comprising: The accommodation information is
6. The wireless communication terminal apparatus according to claim 5, further comprising at least one of a usable transmission rate, a usable transmission rate, and a wireless signal level. In a network composed of at least one wireless communication terminal device, the wireless communication terminal device, and a wireless communication relay device that performs bridging for connecting a local area network or a backbone network,
The wireless communication terminal device
A communication means for transmitting a communication request signal for requesting accommodation information of a wireless communication terminal device accommodated by a wireless communication relay device located in the surrounding area to the wireless communication relay device in a communication range when newly entering the network;
Based on the accommodation information including the number of accommodation terminals and the number of real-time communication terminals received from the wireless communication relay device, select the accommodation destination wireless communication relay device,
The wireless communication relay device
Means for receiving a wireless communication terminal device accommodation information request signal including a scheduled use transmission rate from the wireless communication terminal device;
A table for recording the information of the accommodated wireless communication terminal device,
If the table has a usable transmission rate that is equal to or higher than the intended transmission rate of the wireless communication terminal device , a signal that conveys wireless communication terminal device accommodation information including the number of accommodation terminals and the number of real-time communication terminals is generated. Means,
Means for transmitting a signal conveying the wireless communication terminal device accommodation information to a wireless communication terminal device;
Means for receiving an accommodation request signal from a wireless communication terminal device;
Means for making a decision to receive an accommodation request from a wireless communication terminal device;
Means for generating an accommodation response signal for instructing the wireless communication terminal device to receive an accommodation request;
Means for transmitting the accommodation response signal;
Means for recording wireless communication terminal device information included in the accommodation request signal in a table for recording the wireless communication terminal device information when generating an accommodation response signal including an accomodable indicator;
A wireless communication relay device comprising: The accommodation information and the wireless terminal device accommodation information are:
The wireless communication relay device according to claim 7, further comprising at least one of a usable transmission rate, a usable transmission rate, and a wireless signal level. In a network composed of at least one wireless communication terminal device, the wireless communication terminal device, and a wireless communication relay device that performs bridging for connecting a local area network or a backbone network,
The wireless communication terminal device
A communication means for transmitting a communication request signal for requesting accommodation information of a wireless communication terminal device accommodated by a wireless communication relay device located in the surrounding area to the wireless communication relay device in a communication range when newly entering the network;
Based on the accommodation information including the number of accommodation terminals and the number of real-time communication terminals received from the wireless communication relay device, select the accommodation destination wireless communication relay device,
The wireless communication relay device
A function for generating a wireless communication terminal device accommodation information signal, having a table for recording wireless communication terminal device accommodation information, including the number of accommodated terminals and the number of real-time communication terminals for the accommodated wireless communication terminal devices; A wireless communication relay device having a function of transmitting a signal conveying the wireless communication terminal device accommodation information to a communication terminal device. The accommodation information and the wireless terminal device accommodation information are:
The wireless communication relay device according to claim 9, further comprising at least one of a usable transmission rate, a usable transmission rate, and a wireless signal level.

Images