JP2004096356A - Data transmission reception method and terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data transmission reception method and a terminal wherein the terminal and an access point of a wireless network transmit / receive data with each other, that realize excellent data transmission reception even in the case of a wireless network system with a narrow communication area or the terminal moves at a high speed and eliminates wasteful transmission reception so as to reduce the power consumption. <P>SOLUTION: The data transmission reception method includes the steps for: performing wireless communication between an access point in the wireless network and the terminal; receiving a position and a mobile speed of the terminal at communication; predicting an access point of a succeeding area to which the terminal moves on the basis of the received position and mobile speed of the terminal; pooling untransmitted data to an access point of a predicted area; and transmitting the pooled data when the access point in the predicted area and the terminal make wireless communication. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data transmission / reception method for transmitting / receiving data between a terminal and an access point of a wireless network, and a terminal.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a wireless network service with a small area, such as a wireless LAN, sometimes goes out of the area before completing data transmission / reception during high-speed movement of an automobile or the like.
[0003]
[Problems to be solved by the invention]
In the above-mentioned wireless network service with a small area, if you leave the area before communicating with the center and completing data transmission and reception in one area, you need to perform data transmission and reception again from the beginning in the next area There was a problem that would occur.
[0004]
In order to solve these problems, the present invention searches the map for the next area to be moved based on the position and the moving speed when the terminal communicates with the center in the area where the wireless network service exists, and stores the data in the next area. Pool, immediately receive the pooled data when the terminal enters the next area, realize comfortable data transmission and reception even if the terminal moves at high speed even in a wireless network system with a narrow communication area The purpose is to reduce the power consumption.
[0005]
[Means for Solving the Problems]
Means for solving the problem will be described with reference to FIG.
[0006]
In FIG. 1, a center 1 is connected to a network and controls the entire system.
[0007]
The terminal 2 communicates with the access point 3 wirelessly.
The access point 3 wirelessly communicates with many terminals 2.
[0008]
The wireless network service area 4 is an area where the terminal 2 can communicate with the access point 3 wirelessly.
[0009]
Next, the operation will be described.
The access point 3 wirelessly communicates with the terminal 2 in the wireless network service area 4, receives the position and the moving speed of the terminal 2 at the time of communication, notifies the center 1, and notifies the center 1 of the position and the movement of the terminal 2 received by the center 1. Based on the speed, the access point 3 of the next wireless network service area 4 to which the terminal 2 moves is predicted, and untransmitted data is transmitted to the predicted access point 3 of the wireless network service area 4 to be pooled and predicted. The pooled data is transmitted to the terminal 2 when the access point 3 in the wireless network service area 4 and the terminal 2 wirelessly communicate with each other.
[0010]
In addition, the terminal 2 wirelessly communicates with the access point 3 of the wireless network service area 4, and the terminal 2 accesses the next wireless network service area 4 or the wireless network service area 4 based on the current position and moving speed. Point 3 is predicted and notified, untransmitted data is pooled at access point 3 in the predicted area, and data pooled when communicating with access point 3 in predicted wireless network service area 4 is received. Like that.
[0011]
At this time, the address used by the terminal 2 is reserved at the predicted access point 3 of the wireless network service area 4, and the reserved address is used when the terminal 2 and the access point 3 are wirelessly connected. Data is sent and received.
[0012]
Further, instead of the position and the moving speed of the terminal 2, the route information and the scheduled passage time of the terminal 2 or the checkpoint information to the destination and the scheduled passage time are set.
[0013]
Therefore, the terminal 2 searches the map for the next wireless network service area 4 to be moved based on the position and the moving speed at the time of communication with the access point 3 of the certain wireless network service area 4, and searches for the next wireless network service area 4. By pooling the data in the access point 3 and immediately receiving the pooled data when the terminal 2 enters the next wireless network service area 4, even if the terminal 2 moves at high speed even in a wireless network system with a small area, It is possible to realize comfortable data transmission and reception, and to reduce power consumption by reducing transmission and reception when unnecessary.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the embodiment and operation of the present invention will be sequentially described in detail with reference to FIGS.
[0015]
FIG. 1 shows a system configuration diagram of the present invention.
In FIG. 1, a center 1 provides various services to a terminal 2 by connecting to a network (for example, the Internet). Here, a home agent (HA) 11, a binding table 12, a data pool 13, a map information 14, a home network 15, a server 16, a DB 17, and the like.
[0016]
The home agent (HA) 11 provides various services to the terminal 2, and here provides data to the terminal 2. When the terminal 2 moves from a certain wireless network service area (1) 4 and is predicted to move to the wireless network service area (2) 4, the access point (FA2) 3 of the wireless network service area (2) 4 is set in advance. The data is transferred and pooled, and when the terminal 2 communicates with the access point (FA2) 3 in the wireless network service area (2) 4, the terminal 2 immediately transmits the data.
[0017]
The binding table 12 is for registering and managing various types of information for communicating with the terminal 2 (see (c) of FIG. 2).
[0018]
The data pool 13 temporarily stores data to be transmitted to the terminal 2. The map information 14 sets the location information of the wireless network service area 4 on the map and the access point 3 thereof (see (b) of FIG. 2).
[0019]
The home network 15 is a network in the center 1.
The server 16 extracts relevant data from a DB (database) 17, stores data in the DB 17, and the like.
[0020]
The DB 17 stores various types of data to be provided to the terminal 2, stores data from the terminal 2, and the like.
[0021]
The terminal 2 wirelessly connects to the access point 3 to perform data transmission and reception.
[0022]
The access point (FA) 3 is connected to the center 1 via the network 5 and is provided at a number of places to transmit and receive wirelessly to and from the terminal 2. Here, a transmitting / receiving unit 31, a binding table 32 , A data pool 33 and the like.
[0023]
The transmission / reception unit 31 connects to the center 1 via the network 5 and wirelessly communicates with the terminal 2.
[0024]
The binding table 32 registers and manages information for wirelessly communicating with the terminal 2 (see (c) of FIG. 2).
[0025]
The data pool 33 is a pool of data to be transmitted to the terminal 2.
The wireless network service area 4 is an area where the access point 3 can wirelessly communicate with the terminal 2 to provide a service.
[0026]
The network 5 is a network (for example, the Internet) that connects between the center 1 and the access points 3 located in various places.
[0027]
FIG. 2 shows an explanatory diagram of the present invention.
FIG. 2A shows an example of the terminal 2 attached to the moving body 21. As shown in the figure, the terminal 2 is mounted on a mobile object, here a car, and moves, and moves from a certain wireless network service area (1) 4 to a wireless network service area (2) 4 in FIG. At this time, as will be described later, the user goes out of the wireless network service area (1) 4 before communicating with the access point (FA1) in the wireless network service area (1) 4 and completing data reception. When the data has not been received, the center 1 transfers the data to the access point (FA2) 3 of the wireless network service area (2) 4 which enters next from the position, moving speed, and moving direction of the moving object. The data is transferred and pooled in advance, and when the access point (FA2) 3 and the terminal 2 communicate with each other when entering the wireless network service area (2), the pooled data is immediately transferred and received.
[0028]
FIG. 2B shows the terminal 2 moving toward the wireless network service area (2) at the current position, speed, and direction. In this state, the terminal 2 is not in any wireless network service area 4 and cannot communicate with the access point 3. When the terminal 2 enters the wireless network service area (2), the terminal 2 can communicate with the access point (FA2) and receive the pooled data immediately.
[0029]
FIG. 2C shows an example of a binding table. This registers and manages information required when the terminal 2 and the access point 3 communicate wirelessly. Here, the following information illustrated is registered in association with the information.
[0030]
-MAC address:
・ Home Address (global IP address):
-Care-Of Address (local IP address):
・ Terminal location (longitude / latitude):
・ Terminal moving speed, direction:
・ Valid flag: ○ (valid), × (invalid)
・ Others:
Here, the MAC address is an address unique to the terminal 2 (for example, a device address). Home Address is a unique address given to the terminal 2. Care-Of Address is an address for mutual communication within the wireless network service area. The terminal position (longitude / latitude) is the current position (longitude / latitude) of the terminal 2. The moving speed and direction of the terminal are the moving speed and direction of the terminal. The valid flag is a flag indicating whether the entry is ○ (valid) or × (invalid).
[0031]
As described above, providing the binding table 32 in the access point 3 enables mutual communication with the terminal 2 in the wireless network service area 4 of the access point 3. The terminal 2 newly entering the wireless network service area 4 normally communicates with the access point 3 and is assigned a Care-Of Address. When the data is pooled, the Care-Of Address of the terminal 2 to which the data is passed is reserved in advance and set in the binding table 32, and the reservation is immediately made when the terminal 2 and the access point 3 communicate. The data is transmitted to the terminal 2 using the Care-Of Address to be received.
[0032]
Next, the operation of the configuration of FIGS. 1 and 2 will be described in detail according to the order of the flowchart of FIG.
[0033]
FIG. 3 is a flowchart illustrating the operation of the present invention. Here, the terminal, the access point (FA1), the access point (FA2), and the center (home agent, server) are the terminal 2, the access point (FA1) 3, the access point (FA2) 3, and the center (home agent) in FIG. 11, server 16) respectively.
[0034]
In FIG. 3, in S1 and S2, the terminal 2 transmits the MAC address m1 to the access point (FA1), and the access point (FA1) receives the MAC address m1.
[0035]
In S3 and S4, the access point (FA1) transmits the Care-Of Address a1 to the terminal 2, and the terminal 2 receives the Care-Of Address a1. This is because the access point (FA1) 3, which has received the MAC address m1 of the terminal 2 in S2, assigns the Care-Of Address (local IP address) a1 of the terminal 2 uniquely assigned in the wireless network service area (1) to the terminal. 2 and the terminal 2 acquires it.
[0036]
Through the above S1 to S4, the terminal 2 acquires the Care-Of Address (IP address) a1 used for communication in the wireless network service area (1) and sets it in the binding table 32 of FIG. This means that preparation for communication and mutual communication with the access point (1) 3 in the wireless network service area (1) has been completed.
[0037]
In S5 and S6, the terminal 2 transmits the location information (h1, a1, m1, x1, v1) of the network, and the home agent 11 of the center 1 receives the information via the access point (FA1) 3 and the network 5. here,
h1: Home Address of terminal 2
a1: Care-Of Address assigned to terminal 2
m1: MAC address of terminal 2
x1: current position of terminal 2 (longitude, latitude)
v1: Current speed and direction of terminal 2
In S7 and S8, the server 16 in the center 1 transmits data, the home agent 11 receives the data, and temporarily stores the data in the data pool 13.
[0038]
S9 predicts the position of the wireless network service area 4 next to the terminal. This predicts the wireless network service area to which the terminal 2 will move next based on the current position information (a1, x1, v1) of the terminal 2 received in S6.
[0039]
In S10 and S11, the home agent 11 makes a reservation of the Care-Of Address of the terminal 2 to an access point (for example, the access point (FA2)) in the next wireless network service area, and makes a reservation as a2, for example, as a Care-Of Address.
[0040]
In S12 and S13, the data held by the home agent 11 is transmitted to the access point (FA2) 3 of the next wireless network service area 4 as data for the terminal 2 of h1 and m1, and the access point (FA2) 3 receives the data. Are stored in the data pool 33.
[0041]
In S14, it is determined whether the terminal 2 has not come within the designated period. It is determined whether or not the terminal 2 has not wirelessly contacted the access point (FA2) 3 of the reserved wireless network service area 4 even after a predetermined time has elapsed since the reservation of the Care-Of Address a2. If YES, the data pooled in S29 is discarded. In the case of NO, the terminal 2 communicates with the access point (FA2) 3 within the predetermined time, that is, the MAC address m1 transmitted from the terminal 2 in S15 and S16 is received by the access point (FA2) 3. , And transmits the Care-Of Address a2 reserved in S17 and S18 to the terminal 2. As a result, the terminal 2 has completed preparation for data transmission and reception with the access point (FA2).
[0042]
In S19 and S20, the terminal 2 receives and receives the pooled data downloaded from the access point (FA2) 3.
[0043]
In S21, S22, S23, and S24, the terminal 2 uploads data to the access point (FA2) 3 and further transfers the data to the server 16 via the home agent 11.
[0044]
Through the above steps S5 to S26, the terminal 2 transmits the location information (h1, a1, m1, x1, v1) of the network to the home agent 11, and the home agent 11 predicts the next wireless network service area 4 of the terminal 2. The terminal 2 transmits the MAC address m1 to the access point (FA2) 3 of the next wireless network service area 4 by preliminarily reserving Care-Of Address a2 and transmitting data to the access point (FA2) 3 and pooling the data. At this time, the reserved Care-Of Address a2 of the terminal 2 is immediately transmitted to the terminal 2, and the terminal 2 can immediately receive the download of the pooled data using the Care-Of Address a2. .
[0045]
S27 and S28 detect that the access point (FA2) 3 has gone out of the wireless network service area 4 of the terminal 2, notify the home agent 11, and register the fact in the binding table 12 (the corresponding entry). Set invalid flag).
[0046]
As described above, the terminal 2 transmits the MAC address m1 to the access point (FA1), receives the assigned Care-Of Address a1, and uses the a1 to determine the location information (h1, a1, m1, x1, v1). Is transmitted to the home agent 11 of the center 1 via the access point (FA1) 3 to reserve the Care-Of Address a2 at the access point (FA2) 3 of the next wireless network service area 4 to which the terminal 2 moves. Send the data to be pooled. Then, when the terminal 2 moves and transmits the MAC address m1 to the access point (FA2) 3, the reserved Care-Of Address 2 is immediately transmitted to the terminal 2, and thereafter, the terminal 2 transmits the Care-Of Address a2. , The pooled data is immediately downloaded from the access point (FA2) 3 and the data can be uploaded and transmitted to the home agent 11 as necessary.
[0047]
FIG. 4 is a flowchart illustrating another operation of the present invention. Here, the terminal, the access point (FA1), the access point (FA2), and the center (home agent, server) are the terminal 2, the access point (FA1) 3, the access point (FA2) 3, and the center (home agent) in FIG. 11, server 16) respectively. FIG. 3 shows a flowchart in the case where the home agent 11 of the center 1 predicts the next wireless network service area 4 of the terminal 2, while FIG.
[0048]
In FIG. 4, in S31 and S32, the terminal 2 transmits the MAC address m1 to the access point (FA1), and the access point (FA1) receives the MAC address m1.
[0049]
In S33 and S34, the access point (FA1) transmits Care-Of Address a1 to the terminal 2, and the terminal 2 receives the Care-Of Address a1. This is because the access point (FA1) 3, which has received the MAC address m1 of the terminal 2 in S2, assigns the Care-Of Address (local IP address) a1 of the terminal 2 uniquely assigned in the wireless network service area (1) to the terminal. 2 and the terminal 2 acquires it.
[0050]
By the above S31 to S34, the terminal 2 acquires the Care-Of Address (IP address) a1 used for communication in the wireless network service area (1) and sets it in the binding table 32 of FIG. This means that preparation for communication with the access point (1) 3 in the wireless network service area (1) has been completed.
[0051]
In S35 and S36, the terminal 2 transmits the location information (h1, a1, m1) of the network, and the home agent 11 of the center 1 receives the information via the access point (FA1) 3 and the network 5. here,
h1: Home Address of terminal 2
a1: Care-Of Address assigned to terminal 2
m1: MAC address of terminal 2
In S37 and S38, the home agent 11 transmits the map information of the next wireless network service area, and the terminal 2 having received the map information sets the next wireless network service area 4 to move based on the current position, moving speed, and direction. Predict.
[0052]
In S39 and S40, the terminal 2 transmits the position information predicted in S38 to the home agent 11 via the access point (FA1) 3, and the home agent 11 receives the position information.
[0053]
In S41 and S42, the server 16 in the center 1 transmits data, the home agent 11 receives the data, and temporarily stores the data in the data pool 13.
[0054]
In S43 and S44, the home agent 11 makes a reservation of the Care-Of Address of the terminal 2 to an access point (for example, the access point (FA2)) of the next wireless network service area, and makes a reservation as, for example, a2 as a Care-Of Address.
[0055]
In steps S43 and S44, the data held by the home agent 11 is transmitted to the access point (FA2) 3 of the next wireless network service area 4 as data for the terminal 2 of h1 and m1, and the access point (FA2) 3 receives the data. Are stored in the data pool 33.
[0056]
A step S47 decides whether or not the terminal 2 has not come within the designated period. This is to determine whether the terminal 2 has not wirelessly contacted the access point (FA2) 3 of the reserved wireless network service area 4 even if a predetermined time has elapsed since the reservation of the Care-Of Address a2. If YES, the data pooled in S67 is discarded. In the case of NO, the terminal 2 communicates with the access point (FA2) 3 within a predetermined time, that is, the MAC address m1 transmitted from the terminal 2 in S48 and S49 is received by the access point (FA2) 3. , And sends the Care-Of Address a2 reserved in S50 and S51 to the terminal 2. As a result, the terminal 2 has completed preparation for data transmission and reception with the access point (FA2).
[0057]
A step S52 decides whether or not there is data for h1. If YES, the terminal 2 downloads the data pooled by the access point (FA2) 3 in S53 and S54, and the terminal 2 receives it. On the other hand, if NO in S52, the process proceeds to S55 and S56.
[0058]
In S55, S56, S57, and S58, the terminal 2 uploads data to the access point (FA2) 3, and further transfers the data to the server 16 via the home agent 11.
[0059]
Through S35 to S58 described above, the terminal 2 transmits the location information (h1, a1, m1) of the network to the home agent 11 and receives the download of the map information, and the terminal 2 receives the map information based on the current position, moving speed, and direction. Predicts the next wireless network service area 4 and sends it to the home agent 11, which reserves a Care-Of Address a2 in advance at the access point (FA2) 3 of the predicted wireless network service area 4 and stores the data in advance. Is pooled, and when the terminal 2 transmits the MAC address m1 to the access point (FA2) 3 in the next wireless network service area 4, the reserved Care-Of Address a2 of the terminal 2 is immediately transmitted to the terminal 2. And the terminal 2 transmits the Care-Of Add It is possible to receive download the immediate has been pooled on the data using the ess a2.
[0060]
Thereafter, in S59 to S64, the terminal 2 transmits the location information (h1, a2, m1) of the network and transmits the access point (FA2) 3 and the network 5 The home agent 11 receives it. The home agent 11 transmits the map information of the next wireless network service area, and the terminal 2 having received the information predicts the next wireless network service area 4 to move based on the current position, moving speed, and direction. Then, the terminal 2 transmits the predicted position information to the home agent 11 via the access point (FA2) 3, and the home agent 11 receives the information. Then, the process is executed in the same manner as in S41 and thereafter.
[0061]
FIG. 5 shows a flowchart (terminal) for explaining the operation of the present invention.
In FIG. 5, S71 determines whether or not the area within the area of the wireless network service is detected. This is because the terminal 2 in FIG. 1 enters the wireless network service area 4 and detects the wireless communication from the access point 3 to determine whether the terminal 2 is within the service area. In the case of YES, the process proceeds to S72. In the case of NO, S71 is repeated.
[0062]
A step S72 notifies the access point FA of its own identifier (MAC address).
[0063]
A step S73 acquires Care-Of Address a1 from the FA.
In step S74, data stored in the FA pool is received.
[0064]
A step S75 decides whether or not the terminal 2 has transmission data. That is, the access point FA determines whether there is data stored in the data pool 33 as data for a terminal (for example, Home Address h1). In the case of YES, a request is made in S76 to the FA to pool the transmission data (when not yet transmitted, to the access point FA in the next wireless network service area 4), and the flow proceeds to S77. In the case of NO, the process proceeds to S77.
[0065]
A step S77 decides whether or not the wireless network service is out of the service area. In the case of YES, the process returns to S71. In the case of NO, in S74, the data stored in the FA pool is received. Then, S75 and subsequent steps are repeated.
[0066]
In S78, the HA (the home agent 11 of the center 1) is periodically
・ Home Address
・ Care-Of Address
・ Location information of terminal 2
・ Moving speed and direction of terminal 2
Is notified by a message obtained by extending the Binding Update. As a result, the above-mentioned information of each terminal 2 is periodically updated to the HA, the access point FA of the next wireless network service area 4 to be moved is predicted, and the data is reserved in advance for the pool and Care-Of Address. It is possible to keep. When the next wireless network service area is predicted by the terminal 2, the position of the next wireless network service area and the estimated arrival time are transmitted instead of the moving speed and the direction of the terminal 2.
[0067]
As described above, the terminal 2 transmits the MAC address to the access point FA in the wireless network service area 4 to acquire, for example, a Care-Of Address a1, and the terminal 2 downloads pooled data from the FA using the a1. At the same time, when the data for the terminal 2 has not been transmitted to the FA, it is possible to request the access point (FA) 3 in the next wireless network service area 4 to be pooled (for details, see FIGS. 3 and 4). .
[0068]
FIG. 6 shows an operation explanation flowchart (HA) of the present invention.
In FIG. 6A, S81 receives data addressed to the terminal 2.
[0069]
In S82, it is determined whether or not the Care-Of Address of the terminal 2 is registered. In these steps S81 and S82, the home agent (HA) 11 receives the data addressed to the terminal from the server 16 and refers to the binding table 12 to determine whether or not the Care-Of Address of the terminal 2 is registered. In the case of YES, a request is made to have the received data pooled by the FA (access point) in the wireless network service area 4 of the Care-Of Address registered in S85. On the other hand, in the case of NO, the process proceeds to S83.
[0070]
A step S83 detects an FA in the wireless network service area 4 in which the terminal 2 is predicted to enter next.
[0071]
In step S84, the FA of the wireless network service area 4 is notified of the identifier (MAC address) of the terminal 2 and the Home Address, and requests registration of the Care-Of Address. Then, a request is made to have the received data pooled by an FA (access point) in the wireless network service area 4 of the Care-Of Address for which registration has been requested in S85.
[0072]
As described above, when the home agent (HA) 11 of the center 1 receives the data addressed to the terminal 2 and the Care-Of Address of the terminal 2 is already registered, the access point (FA) 3 of the wireless network service area 4 is registered. The data of the terminal 2 is transferred and pooled. On the other hand, when the Care-Of Address of the terminal 2 is not registered, the wireless network service area predicted that the terminal 2 will enter next (see FIG. 6B). It is possible to reserve a Care-Of Address at the access point (FA) 3 of the third party, transfer the data, and make a pool request. With this, when the terminal 2 transmits the MAC address to the access point 3 of the next wireless network service area 4, the terminal 2 receives the transmission of the reserved Care-Of Address immediately and the terminal 2 transmits the Care-Of Address. With this, the pooled data can be immediately downloaded from the access point (FA) 3.
[0073]
In (b) of FIG. 6, S91 receives a message from the terminal 2 that has extended Binding Update.
[0074]
In step S92, the position information, the moving speed, and the direction of the terminal 2 are extracted from the message obtained by expanding the Binding Update. When the next wireless network service area is predicted by the terminal 2, the position of the next wireless network service area and the estimated time of arrival are extracted.
[0075]
In step S93, the location information, the moving speed, and the direction of the terminal 2 are associated with the map of the wireless network service area 4, and the area where the terminal 2 will enter next is predicted.
[0076]
As described above, it is possible to predict the next wireless network service area 4 to be moved based on the current position (longitude, latitude), moving speed, and direction of the terminal 2. Then, it is possible to reserve and transfer the Care-Of Address of the terminal 2 to the access point 3 of the predicted next wireless network service area 4 and transfer the data to the access point 3 ((a) in FIG. 6 described above). reference).
[0077]
FIG. 7 is a flowchart (FA) for explaining the operation of the present invention.
In FIG. 7, in step S101, the terminal 2 enters the area and notifies the identifier (MAC address).
[0078]
S102 allocates the Care-Of Address requested by the home agent (HA) 11 to the terminal 2. In this case, the Care-Of Address of the terminal 2 reserved by the home agent 11 by requesting the access point (FA) 3 is allocated to the terminal 2.
[0079]
A step S103 decides whether or not the HA has already requested the FA to pool the data addressed to the terminal 2. In the case of YES, the FA transmits the pooled data to the terminal 2 in S104, and proceeds to S105. On the other hand, if NO in S103, the process proceeds to S015.
[0080]
In S105, it is determined whether the terminal 2 has gone out of the service area of the network service area 4. In the case of YES, in step S106, the FA cancels the association between the Home Address and the Care-Of Address, and in step S107, the FA notifies the HA that the terminal 2 has gone out of the area by using the Binding Update (from the binding table 12). (The association between Home Address and Care-Of Address is canceled.)
[0081]
In step S108, the terminal 2 determines whether there is data to be transmitted. In the case of YES, the FA receives the data from the terminal 2 and pools it once in S109, and transmits the data requested from the terminal 2 to the destination in S110.
[0082]
FIG. 8 is a flowchart (FA) for explaining the operation of the present invention.
In FIG. 8, S121 is requested by the HA to assign the identifier (MAC address) of the terminal 2 and the Care-Of Address corresponding to the Home Address.
[0083]
In S122, the FA reserves a Care-Of Address corresponding to the identifier (MAC address) of the terminal 2.
[0084]
In S123, it is determined whether or not the HA requests to pool the data addressed to the terminal 2. In the case of YES, data destined for the terminal 2 from the HA is pooled in S124. In the case of NO, the process proceeds to S125.
[0085]
In S125, it is determined whether the terminal 2 has not entered the wireless network service area for a predetermined time. In the case of YES, in S126, the FA cancels the association between the Home Address and the Care-Of Address, and discards the pooled data. On the other hand, if NO in S125, the process returns to S123 and repeats.
[0086]
As described above, the FA that has specified the MAC address of the terminal 2 and the Home Address from the HA and received the reservation request for the Care-Of Address of the terminal 2 performs the reservation of the Care-Of Address, and issues a data pool request from the HA. When receiving, FA pools. If the terminal 2 does not enter the wireless network service area 4 of the FA after a certain period of time, the association between the Home Address and the Care-Of Address is canceled and the pooled data is discarded, thereby binding by reservation. It is possible to eliminate the situation where the table 32 and the data pool 33 are full.
[0087]
(Appendix 1)
In a data transmitting and receiving method in which a terminal and an access point of a wireless network transmit and receive data,
Wirelessly communicating between an access point and a terminal in a wireless network;
Receiving the position and the moving speed of the terminal during the communication;
Based on the received position and moving speed of the terminal, a step of predicting an access point in the next area where the terminal moves,
Pooling untransmitted data to access points in the predicted area;
Transmitting the pooled data when the access point of the predicted area and the terminal wirelessly communicate with each other;
A data transmission / reception method comprising:
[0088]
(Appendix 2)
In a data transmitting and receiving method in which a terminal and an access point of a wireless network transmit and receive data,
Wirelessly communicating between an access point and a terminal in a wireless network;
Receiving the access point of the area or area where the terminal moves next predicted based on the current position and the moving speed,
Pooling untransmitted data to access points in the predicted area;
Transmitting the pooled data when the access point of the predicted area and the terminal wirelessly communicate with each other;
A data transmission / reception method comprising:
[0089]
(Appendix 3)
An address used by the terminal is reserved at an access point in the predicted area, and the data is transmitted / received using the reserved address when the terminal and the access point are wirelessly connected. The data transmission / reception method according to Supplementary Note 1 or 2.
[0090]
(Appendix 4)
Any of supplementary notes 1 to 3, characterized in that, instead of the position and the moving speed of the terminal, the route information and the scheduled passing time of the terminal, or the checkpoint information to the destination and the scheduled passing time, are used. Data transmission / reception method described in 1.
[0091]
(Appendix 5)
In a terminal that transmits and receives data to and from an access point of a wireless network,
Means for wirelessly communicating with an access point having a wireless network;
At the time of the communication, the current position and the moving speed of the terminal are transmitted, and the unreceived data is pooled at the access point of the next moving area, or the next moving area based on the current position and the moving speed of the terminal. Or means for predicting and transmitting an access point in an area and pooling unreceived data in the access point in the area,
Means for receiving the pooled data when wirelessly communicating with the predicted next area access point;
A terminal comprising:
[0092]
(Appendix 6)
The terminal according to claim 5, wherein an address to be used is reserved at the access point in the predicted area, and the data is transmitted and received using the reserved address when the access point is wirelessly connected. .
[0093]
【The invention's effect】
As described above, according to the present invention, when the terminal 2 communicates with the access point 3 of a certain wireless network service area 4, the terminal 2 moves the next wireless network service area 4 based on the position, the moving speed, etc. on the map. , Data is pooled in the access point 3 of the next wireless network service area 4, and when the terminal 2 enters the next wireless network service area 4, the pooled data is immediately received. Therefore, even in a wireless network system having a small area, comfortable data transmission / reception can be realized even when the terminal 2 moves at high speed, and transmission / reception can be reduced to reduce power consumption when unnecessary.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of the present invention.
FIG. 2 is an explanatory diagram of the present invention.
FIG. 3 is a flowchart illustrating the operation of the present invention.
FIG. 4 is a flowchart illustrating another operation of the present invention.
FIG. 5 is a flowchart (terminal) illustrating the operation of the present invention.
FIG. 6 is a flowchart (HA) illustrating the operation of the present invention.
FIG. 7 is a flowchart (FA) for explaining the operation of the present invention.
FIG. 8 is an operation explanatory flowchart (FA) of the present invention.
[Explanation of symbols]
1: Center
11: Home Agent (HA)
12, 32: binding table
13, 33: Data pool
14: Map information
15: Home network
16: Server
17: DB
2: Terminal
21: Moving object
3: Access point (FA)
31: transceiver
4: Wireless network service area
5: Network (Internet)

Claims (5)

In a data transmitting and receiving method in which a terminal and an access point of a wireless network transmit and receive data,
Wirelessly communicating between an access point and a terminal in a wireless network;
Receiving the position and the moving speed of the terminal during the communication;
Based on the received position and moving speed of the terminal, a step of predicting an access point in the next area where the terminal moves,
Pooling untransmitted data to access points in the predicted area;
Transmitting the pooled data when the access point in the predicted area and the terminal wirelessly communicate with each other. In a data transmitting and receiving method in which a terminal and an access point of a wireless network transmit and receive data,
Wirelessly communicating between an access point and a terminal in a wireless network;
Receiving the access point of the area or area where the terminal moves next predicted based on the current position and the moving speed,
Pooling untransmitted data to access points in the predicted area;
Transmitting the pooled data when the access point in the predicted area and the terminal wirelessly communicate with each other. An address used by the terminal is reserved at an access point in the predicted area, and the data is transmitted / received using the reserved address when the terminal and the access point are wirelessly connected. The data transmission / reception method according to claim 1 or 2. In a terminal that transmits and receives data to and from an access point of a wireless network,
Means for wirelessly communicating with an access point having a wireless network;
At the time of the communication, the current position and the moving speed of the terminal are transmitted, and the unreceived data is pooled at the access point of the next moving area, or the next moving area based on the current position and the moving speed of the terminal. Or means for predicting and transmitting an access point in an area and pooling unreceived data in the access point in the area,
Means for receiving the pooled data when wirelessly communicating with the predicted next area access point. The access point in the predicted area is used to reserve an address to be used, and when the access point is wirelessly connected, the data is transmitted / received using the reserved address. Terminal.

Images