JP2002101042A - Method of data communication in phs, and portable terminal for phs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable high-speed and high-quality data communication. SOLUTION: A portable terminal device 101 for PHS and a plurality of base stations 104 and 105 are connected with each other, the same data are sent from the portable terminal device for PHS to each base station 104 and 105, and the data received with each base station 104 and 105 are received in a lump with a server 106, and a normal datum among the data received with the server 106 is sent to an opposite side computer 109 via the Internet 107 and a Web server 108.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a PHS (Personal
Data communication method and PH in Handyphone System)
The present invention relates to a mobile terminal device for S.

[0002]

2. Description of the Related Art Conventionally, in PHS, not only voice communication but also data communication (for example, PIAFS) has been performed. Since the PHS is a mobile communication system in which the PHS mobile terminal device moves, a communication method called high-speed handover is used to maintain the communication quality accompanying the movement of the PHS mobile terminal device. This is because the PHS portable terminal device is connected to a network via a certain base station (hereinafter, this communication path is referred to as link 1), and the PHS portable terminal device has a communication quality associated with movement or the like. Before the communication is disabled via the link 1, a communication path via another base station (hereinafter referred to as link 2) is established before the communication is disabled. This is a method of instantaneously switching the communication path from link 1 to link 2.

[0003] Thus, there is an advantage that the intended communication is interrupted only at the moment when the link is switched, and particularly in a voice call, the caller is hardly affected by the instantaneous interruption.

[0004]

However, in data communication, even if a high-speed handover is applied, if a link is switched during data transmission / reception, data loss will occur instantaneously, resulting in high data loss. It adversely affects data communication requiring reliability.

[0005] In addition, the quality of the two links changes independently of each other with the change in the radio wave propagation state, and one of the links is not necessarily superior. By switching the links, the quality is further improved. Degradation can also occur.

Furthermore, since the communication itself is performed using one link, if instantaneous interference or fading occurs on this link, it directly leads to a data error.

As a method for solving these problems, it is conceivable to perform retransmission control using a higher-level protocol. However, although this method can recover from a data error or data loss, there is a problem in that retransmission is performed, thereby reducing the throughput and making high-speed communication difficult.

An object of the present invention is to enable high-speed and high-quality data communication. Another object of the present invention is to enable high-speed and high-quality data communication even when a handover occurs. Also, the present invention
It is an object to enable high-speed and high-quality data communication even when the communication state is deteriorated.

[0009]

According to the present invention, a PHS is provided.
PHS in which data is transmitted from the PHS portable terminal device to a desired destination by performing wireless communication between the PHS portable terminal device and the base station.
Mobile terminal device connected to the plurality of base stations,
The same data is transmitted from the portable terminal device for S to each of the base stations, the data received at each of the base stations is received by the PHS connection means, and the normal data among the data received from each of the base stations is transmitted. A data communication method in a PHS is provided, wherein one data is transmitted to the destination. The PHS portable terminal device is connected to a plurality of base stations, the same data is transmitted from the PHS portable terminal device to each of the base stations, and the data received by each of the base stations is received by the PHS connecting means. Then, one normal data among the data received from each of the base stations is transmitted to the other party.

[0010] Here, the data transmission from each of the base stations to the PHS connection means may be performed in units of radio frames or in units of a plurality of radio frames.

When it is determined that a handover is required in the PHS portable terminal device, the PHS portable terminal device is connected to a plurality of base stations before performing a handover process, and the PHS portable terminal device is connected to the plurality of base stations. The same data may be transmitted from the terminal device to the plurality of connected base stations.

[0012] Further, when the PHS portable terminal detects deterioration of the communication state, the PHS portable terminal is connected to a plurality of base stations, and the PHS portable terminal is connected to the plurality of connected base stations. The same data may be transmitted to the station.

Further, according to the present invention, a PHS which transmits data from the PHS portable terminal device to a desired destination by performing wireless communication between the PHS portable terminal device and the base station. In the above, when the PHS portable terminal device performs handover from one base station to another base station, the PHS portable terminal device transmits to the one base station when it determines that a handover is necessary. A data communication method in a PHS, characterized in that a packet length of data to be transmitted is shortened. When the PHS portable terminal device performs handover from one base station to another base station, the PHS portable terminal device determines that the necessity of handover has occurred, and transmits a packet of data to be transmitted to one base station. Shorten and send.

Further, according to the present invention, a PHS which transmits data from the PHS portable terminal device to a desired destination by performing radio communication between the PHS portable terminal device and the base station. Transmitting data from the PHS portable terminal device to one base station, transmitting data received by the one base station to a PHS connection means,
When the data received by the HS connection means is transmitted to the other party, and when the PHS portable terminal device performs handover from the one base station to another base station, all the data received by the one base station is There is provided a data communication method in PHS, wherein a handover is performed after being transmitted to the PHS connection means. Transmitting data from the PHS portable terminal device to one base station, transmitting the data received by the one base station to the PHS connection means, transmitting the data received by the PHS connection means to the other party, When the PHS portable terminal device performs handover from the one base station to another base station, the handover is performed after all data received by the one base station is transmitted to the PHS connection unit.

Further, according to the present invention, in a PHS portable terminal device configured to transmit data to a desired destination by performing wireless communication with a base station, a plurality of the base stations are connected. There is provided a PHS portable terminal device comprising: a base station connecting means; and a communication means for transmitting the same data to each of the base stations.
The base station connecting means connects to a plurality of the base stations. The communication means transmits the same data to each of the base stations.

Here, there is provided a handover determining means for determining the necessity of a handover, and a handover processing means for performing a handover process. When the handover determining means determines that the necessity of the handover has occurred, the base station connection is established. The means may be configured to connect to a plurality of the base stations before the handover processing means performs the handover processing.

[0017] Further, there is provided communication state detecting means for detecting deterioration of the communication state. When the communication state detecting means detects that the communication state has deteriorated, the base station connecting means connects to the plurality of base stations. It may be configured as follows.

Further, according to the present invention, a PHS which transmits data from the PHS portable terminal device to a desired destination by performing wireless communication between the PHS portable terminal device and the base station. Communication device for transmitting data in packet units, handover determination means for determining the necessity of handover, and handover processing means for performing handover processing, wherein the necessity of handover is determined by the handover determination means. When the communication means determines that the communication has occurred, the communication means shortens the data packet length and transmits the data to the base station before the handover processing means performs the handover processing. Is done. When the handover determining unit determines that the necessity of the handover has occurred, the communication unit shortens the data packet length and transmits the data to the base station before the handover processing unit performs the handover process.

Further, according to the present invention, in a PHS portable terminal device configured to transmit data to a desired destination by performing radio communication with a base station, Communication means for transmitting data, handover determination means for determining the necessity of handover,
Handover processing means for performing handover processing, data transmission control means for controlling data transmission operation of the communication means, and all data transmitted to the connected base station are PH
Data transmission completion detecting means for detecting that data has been transmitted to the S connection means, wherein the data transmission control means performs data transmission when the handover determination means determines that a handover is necessary. Controlling to stop, the handover processing means performs a handover process after detecting that all the data transmitted to the base station has been transmitted to the PHS connection means by the data transmission completion detection means, The transmission control means controls the communication means to start data transmission after the handover processing by the handover processing means is completed, thereby providing a PHS portable terminal device. The data transmission control unit controls the communication unit to stop data transmission when the handover determination unit determines that the necessity of the handover has occurred, and the handover processing unit transmits the data transmission completion detection unit to the base station. All data is PHS
A handover process is performed after detecting the transmission to the connection unit, and the data transmission control unit controls the communication unit to start data transmission after the handover process by the handover processing unit is completed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A data communication method in a PHS and a PHS portable terminal device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the P used in the embodiment of the present invention.
FIG. 3 is a system configuration diagram of an HS. In an actual system, a plurality of PHS portable terminal devices and a plurality of base stations are used, but in FIG.
Portable terminal device (PS) 101 and two base stations 104
(CS1) and 105 (CS2). A plurality of portable terminal devices for PHS (not shown) each having the same configuration as the portable terminal device for PHS 101 are used.
For a plurality of base stations not shown, base stations 104, 10
The same thing as 5 is used.

In FIG. 1, a PHS portable terminal device 10
1 includes a wireless unit 102 as a communication unit for transmitting and receiving voice and data wirelessly via an antenna, and a control unit 103 as a control unit for performing various controls. The control unit 103 includes a RAM (random) for storing transmission / reception data and the like.
Access Memory) and ROM (Read) that stores programs
A storage unit for the PHS portable terminal device 101, comprising a Central Processing Unit (CPU) (not shown) that operates according to a program stored in the ROM. It performs various controls such as handover processing and call control to a selected communication partner. In addition, the control unit 103 also performs processing such as searching for nearby base stations and measuring RSSI values and FER values.

Here, the radio unit 102 and the control unit 103
Base station connection means for making a call connection to a base station, communication means for transmitting data to the connected base station, handover judgment means for judging the necessity of handover, handover processing means for performing handover processing, communication for detecting deterioration of communication state A state detection unit, a data transmission control unit for controlling a data transmission operation of the communication unit, and a data transmission completion detection unit for detecting that all data transmitted to the base station has been transmitted from the base station to the PHS connection unit. ing.

On the other hand, the base station 104 includes a radio unit for transmitting and receiving voice and data wirelessly via an antenna, and a control unit (neither is shown) for performing various communication controls.
The control unit includes a RAM (random Acc.
ROM (Read Onl) storing ess memory and programs
y Memory) (both not shown)
And a central processing unit (CPU) (not shown) operated by a program stored in the ROM. The base station 104, via the server 106,
It is connected to a communication network (for example, the Internet 107). The Internet 107 includes a Web server 109
, A computer 109 that is a desired destination to which the PHS portable terminal device 101 transmits data is connected.

The base station 105 has the same configuration as the base station 104, and includes a radio unit for transmitting and receiving voice and data wirelessly via an antenna and a control unit (neither is shown) for performing various communication controls. It is connected to the server 106.

Server 106 as PHS connection means
Is the P for connecting the base stations 104 and 105 to the communication network.
It is a device that constitutes a connection device for HS, and is a device that conceals a difference in a route due to a high-speed handover from a communication partner. Has a function as a communication server. In some cases, the server 106
It functions as a communication partner device of the mobile terminal device 101 for S.

The PHS portable terminal device 101 and each base station 1
Between 04 and 105, for example, TDMA (Time Division
Voice and data communication is performed by digital communication using Multiple Access), and data can be transmitted and received to and from the destination computer 109.

FIG. 2 is a diagram for explaining the outline of the first embodiment of the present invention, in which the PHS portable terminal device 101 transmits the same data to both the base station 104 and the base station 105 substantially simultaneously. 4 shows the flow of packet data transmitted between the PHS portable terminal device 101, the base stations 104 and 105, and the server 106 when transmitting the packet data. In addition, "H
"a" is the PHS portable terminal device 101 and the base station 104, 1
05 indicates a local header, and “Hb” indicates a base station 1
04 and 105 and a local header between the server 106 and # 1 to # 3 are sequence numbers indicating the order of packets.

The outline of the first embodiment will be described with reference to FIGS. 1 and 2. First, the PHS portable terminal 1
01 for both base station 104 and base station 105
Consider a case where the same data is transmitted in packets at substantially the same time.

PHS portable terminal device 101 and base station 10
4 and the base station 105 are normally transmitted, the same packet data (# 1) is received by both the base stations 104 and 105, as shown in FIG. The same packet data (# 1) is transmitted to base station 104, 1
05 to the server 106,
Selects one normal packet data (# 1) from the data received from each of the base stations 104 and 105 and transmits it to the destination computer 109 via the Internet 107.

PHS portable terminal device 101 and base station 10
4 when the data transmission between the PHS 4 and the PHS portable terminal device 101 and the base station 105 are abnormal (for example, when the packet data (# 2) is lost). As shown in (b), the packet data (# 2) received by the base station 104 is transmitted to the server 106, and the data is transmitted from the server 106 to the Internet 10
7 to the destination computer 109.

On the other hand, data transmission between the PHS portable terminal device 101 and the base station 105 is normally performed, and the PHS
If there is an abnormality in the data transmission between the portable terminal device 101 and the base station 104 (for example, when the packet data (# 3) is lost), as shown in FIG.
5, the packet data (# 3) received by the server 106
The data is transmitted from the server 106 to the destination computer 109 via the Internet 107.

FIGS. 3 to 6 are flowcharts showing processing of the server 106 according to the first embodiment of the present invention. The flowchart is executed by processing the program stored in the ROM of the server 106 by the CPU. You.

FIGS. 3 to 6 show processing when the server 106 receives data on the path (link # 1) from the PHS portable terminal device 101 to the server 106 via the base station 104. ing. PHS portable terminal device 10
When the server 106 receives data on the path (link # 2) from the base station 105 to the server 106 via the base station 105, NS1 in FIGS. 3 to 6 may be replaced with NS2. The description about is omitted.

The sequence number of the packet to be processed received by the server 106 is “RS”, the sequence number of the packet that the server 106 expects to receive next from the base station 104 is “NS1”, and the server 106 The sequence number of the packet expected to be received next from the station 105 is "NS
2 ", the sequence number of the packet to be notified to the next higher protocol in the process of the server 106 is" SS ", and in the initial state, RS = SS = NS1 = NS2 = 0.

In the PHS portable terminal device 101,
It is assumed that transmission starts from the packet with the sequence number “0”. When the PHS portable terminal device 101 is connected to only one of the base stations 104 and 105 (one link state), the PHS portable terminal device 101 assigns a sequence number only to the connected base station. The same packet is transmitted to both base stations 104 and 105 as soon as the packet is transmitted and connected to the other base station (two-link state).

In the one-link state, the server 106 always updates NS1 and NS2 at the same time, so that a packet loss on one link is treated as a loss on both links. If the same packet is lost on both links, the next packet is notified to the upper layer protocol. When retransmission is necessary, a protocol for performing retransmission control to a higher layer (for example, LAPB (Link Access Procedure)
e-Balanced, balanced link access procedure)) is implemented, and packet loss is detected and retransmitted in the upper layer protocol.

The order number of the packet uses a modulo N variable so that even if there is a delay difference between the two links # 1 and # 2, the order numbers can be compared in the processing flow described later. Then, the value of N is set so as to have a sufficiently large repetition period. The comparison of the order numbers is performed in consideration of the repetition period.

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS.
The embodiment will be described in detail. First, the PHS portable terminal device 101 makes a call connection to a plurality of base stations (base station 104 and base station 105) by base station connection means, and starts transmitting the same data to each of the base stations 104 and 105. .

The server 106 is the PHS portable terminal 1
01 from base station 104 via link # 1.
, The magnitude relationship between RS and SS is compared (step S301 in FIG. 3).

When the SS is larger than the RS, the packet having the same sequence number is sent to the server 1 via the other link # 2.
06 is received and the reception notification has been completed. Therefore, in this case, NS1 = (RS + 1) is set (step S302), and the received packet is discarded (step S303).

In step S301, when SS and RS are equal, it means that the server 106 has received the packet via the link # 1 earlier than the link # 2. In this case, NS1 = (RS + 1) is set (step S30).
4) Also, assuming that SS = (SS + 1) (step S30)
5) A notification of reception is made (step S306). afterwards,
The reception notification waiting queue is removed (step S3).
07).

In the reception notification waiting queue removal process (step S307), the process shown in FIG. 4 is performed. That is,
First, an RS in the reception notification waiting queue is searched (step S
401), when it is determined that the same RS as the SS exists, SS = (SS + 1) is set (step S402),
Next, a reception notification is performed (step S403). Thereafter, steps S401 to S403 are repeated, and step S40
In 1, if it is determined that the same RS as the SS does not exist, the process is terminated.

Next, when the SS is smaller than the RS in step S301, it means that the packet having the SS sequence number is lost in the link # 1. In this case, NS1 = (RS + 1) (step S30).
8), a reception notification waiting queue registration process is performed (step S).
309).

Receiving notification waiting queue registration processing (step S
In 309), the processing shown in FIG. 5 is performed. That is, first, the RS in the reception notification waiting queue is searched (step S5).
01), if it is determined that the same RS does not exist, it is registered in the reception queue (step S502), and the same R
If it is determined that S exists, the received packet is discarded (step S503).

Receiving notification waiting queue registration processing (step S
After completion of step 309), the magnitude relationship between NS2 and SS is compared (step S310). If it is determined in step S310 that NS2 is equal to or less than SS, the link # 1
Thus, there is a possibility that the lost packet is received on the link # 2, and the process is terminated. On the other hand, step S31
If it is determined in step S0 that NS2 is larger than SS, the packet lost on link # 1 is also lost on link # 2, so that both-link loss processing is performed (step S311).

In the both link loss processing (step S311), the processing shown in FIG. 6 is performed. That is, first, the RS with the youngest number is extracted from the reception notification waiting queue (step S601), SS = (RS + 1) is set (step S602), and then a reception notification is performed (step S603). Next, an RS in the reception notification waiting queue is searched (step S
604) If it is determined that there is an RS that matches the SS, the process returns to step S602. When it is determined in step S604 that there is no RS matching the SS, the magnitude relationship between the SS and NS1 and NS2 is compared (step S605). In step S605, S
If it is determined that S is smaller than NS1 and SS is smaller than NS2, it means that the same packet is lost on both links # 1 and # 2, and the process returns to step S601. On the other hand, if it is determined in step S605 that the SS is equal to or greater than NS1 or the SS is equal to or greater than NS2, the two-link loss processing ends.

The server 106 is the PHS portable terminal 1
In the case where data is received via the link # 2 from No. 01, the process of replacing NS1 with NS2 in FIGS. 3 to 6 is performed.

As described above, according to the first embodiment, a plurality of links from the PHS portable terminal device 101
The data is transmitted to the computer 109 using 1, # 2. Therefore, even when data of one link is lost, data of the other link can be transmitted, so that high-quality data communication can be performed. Further, in this case, since there is no need to perform retransmission control, high-speed data communication becomes possible.

FIG. 7 is a flowchart showing a process of the PHS portable terminal device 101 according to the second embodiment of the present invention. The program stored in the ROM of the control unit 103 is processed by the CPU. Be executed. Since the system configuration of the second embodiment is the same as that of FIG. 1, the second embodiment will be described below with reference to FIGS.

First, it is assumed that the PHS portable terminal device 101 is in a state of transmitting data to the base station 104 as an initial state. In this state, the control unit 103
It is determined whether a handover is necessary (step S70)
1). For example, when the RSSI value falls below a predetermined value,
Alternatively, when the FER value becomes equal to or more than a predetermined value, it is determined that handover is necessary. Step S701 is
It constitutes handover determination means for determining the necessity of handover. If it is determined in step 701 that a handover is necessary, before performing the handover process, a call connection is made to the base station 105 to connect to a plurality of base stations (the base station 104 and the base station 105) (step S7).
02). Here, step S702 constitutes base station connecting means for connecting to a plurality of base stations.

On the other hand, if it is determined in step 701 that the handover is unnecessary, it is determined whether the communication state is degraded (step S703). For example, when a communication error occurs at a predetermined frequency or higher (when retransmission control is performed at a predetermined frequency or higher), it is determined that the communication state has deteriorated. Here, step S703 constitutes communication state detection means for detecting deterioration of the communication state. If it is determined in step S703 that the communication state is degraded, the process proceeds to step S702. If it is determined that the communication state is not degraded, step S701 is performed.
Return to

After making a call connection to base station 104 and base station 105 in step S702, the same data is transmitted to the plurality of base stations (base station 104 and base station 105) (step S704). Here, step S704 is
It constitutes communication means for transmitting the same data to a plurality of base stations. In this state, a handover process is performed to perform a handover to the base station 105 (step S70).
5). Here, step S705 constitutes handover processing means for performing handover processing. When the handover is completed as described above, the server 106 transmits data from the base station 105 to the computer 109.

As a result, data loss can be prevented even in a transitional period during handover or when the communication state deteriorates.

FIG. 8 is a flowchart showing a process of the PHS portable terminal device 101 according to the third embodiment of the present invention. The program stored in the ROM of the control unit 103 is processed by the CPU. Be executed. Since the system configuration diagram of the third embodiment is the same as that of FIG. 1, the third embodiment will be described below with reference to FIGS.

First, it is assumed that the PHS portable terminal device 101 is transmitting data to the base station 104 as an initial state. In this state, the control unit 103
It is determined whether a handover is necessary (step S80)
1). For example, when the RSSI value falls below a predetermined value,
Alternatively, when the FER value becomes equal to or more than a predetermined value, it is determined that handover is necessary. Step S801 is
It constitutes handover determination means for determining the necessity of handover. If it is determined in step 801 that a handover is necessary, before performing the handover process, the data length of the data to be transmitted to the base station 104 is shortened and transmitted (step S802).

Thereafter, a handover process is performed to connect a call to another base station, for example, the base station 105, and the handover process is completed (step S803). Here, step S803 constitutes handover processing means for performing handover processing. As a result, even if data loss occurs during handover, only data with a short packet length is lost, and retransmission control can be performed in a short time.

FIG. 9 is a flowchart showing a process of the PHS portable terminal device 101 according to the fourth embodiment of the present invention. The program stored in the ROM of the control unit 103 is processed by the CPU. Be executed. Since the system configuration of the fourth embodiment is the same as that of FIG. 1, the fourth embodiment will be described below with reference to FIGS.

First, it is assumed that the PHS portable terminal device 101 is transmitting data to the base station 104 as an initial state. In this state, the control unit 103
It is determined whether a handover is necessary (step S90)
1). For example, when the RSSI value falls below a predetermined value,
Alternatively, when the FER value becomes equal to or more than a predetermined value, it is determined that handover is necessary. Step S901 includes:
It constitutes handover determination means for determining the necessity of handover. If it is determined in step 901 that handover is necessary, data transmission to the base station 104 is stopped before performing handover processing (step S902).

On the other hand, when transmission of all the data received from the PHS portable terminal device 101 to the server 106 is completed, the base station 104 transmits all the received data to the server 106.
A data transmission completion notification indicating that the transmission has been completed is transmitted to the PHS portable terminal device 101.

The PHS portable terminal device 101 is connected to the base station 1
It is determined whether or not the data transmission completion notification has been received from step 04 (step S903). If not, step S903 is repeated again, and if received, a handover process to another base station is executed (step S903). Step S90
4). Here, step S903 constitutes a data transmission completion detection unit that detects that all data transmitted to the connected base station has been transmitted to the server 106. The data transmission completion detecting means detects that a predetermined time (time when all data is expected to be transmitted to the server 106) has elapsed after the handover is determined to be necessary in step S901, and thereby all data are detected. Is transmitted to the server 106. Step S904 constitutes a handover processing means for performing a handover process.

After the handover to the another base station is completed (step S905), data transmission to the other base station is started (step S906). Steps S902 and S906 constitute data transmission control means for controlling the data transmission operation of the communication means.

This eliminates the need to retransmit the data transmitted to base station 104 after handover to the other base station, thus enabling high-speed data transmission. In addition, since it is possible to prevent the data itself from being lost at the time of handover, high-quality data communication can be performed.

As described above, the data communication method in the PHS according to the embodiment of the present invention performs the radio communication between the PHS portable terminal device and the base station, thereby enabling the PHS portable terminal device to perform the desired communication. In a PHS configured to transmit data to the other party, the PHS portable terminal device 101 is connected to a plurality of base stations 104 and 105, and the PHS
The same data is transmitted from the mobile terminal device 101 to each of the base stations 104 and 105, and the data received by each of the base stations 104 and 105 is collectively received by the server 106 and received from each of the base stations 104 and 105. One normal data in the data is transmitted to the destination computer 109. That is, data is transmitted from the PHS portable terminal device 101 to the computer 109 using the plurality of links # 1 and # 2. Therefore, even when data of one link is lost, data of the other link can be transmitted, so that high-quality data communication can be performed. In this case, retransmission control is performed. Since there is no need to perform this, high-speed data communication becomes possible.

Here, when it is determined that the need for handover has occurred in the PHS portable terminal device 101, the PHS portable terminal device 101 is connected to the plurality of base stations 104 and 105 before the handover process is performed, and the PHS A plurality of connected base stations 104, 10
5 by transmitting the same data, it is possible to suppress data loss or the like at the time of handover.

When the PHS portable terminal device 101 detects the deterioration of the communication state, the PHS portable terminal device 10
1 is connected to a plurality of base stations 104 and 105, and the plurality of connected base stations 10 are
By transmitting the same data to 4, 105, it is possible to suppress data loss or the like even when the communication state is deteriorated.

When the PHS portable terminal device 101 performs handover from one base station to another base station,
When the PHS portable terminal device 101 determines that the necessity of the handover has occurred, the PHS portable terminal device 101 reduces the packet length of data to be transmitted to the one base station, thereby suppressing a failure such as a data loss occurring at the time of the handover. It becomes possible.

Further, the PHS portable terminal device 101 transmits data to one base station, transmits the data received by the one base station to the server 106, and transmits the data received by the server 106 to the destination computer 109. Send and PHS
When the portable terminal device 101 performs a handover from the one base station to another base station, the data received by the one base station is transmitted to the server 106, and then the handover is performed. This eliminates the need to retransmit, and enables high-speed data communication.

Further, the PHS portable terminal device according to the embodiment of the present invention performs radio communication with a base station to transmit data to a desired destination.
The portable terminal device comprises a base station connecting means for connecting to the plurality of base stations, and a communication means for transmitting the same data to each of the base stations. That is, it has a function of transmitting data using a plurality of links # 1 and # 2. Therefore, even when data of one link is lost, data of the other link can be transmitted, so that high-quality data communication can be performed. In this case, retransmission control is performed. Since there is no need to perform this, high-speed data communication becomes possible.

Here, there is provided a handover determining means for determining the necessity of a handover, and a handover processing means for performing a handover process. When the handover determining means determines that the necessity of the handover has occurred, the connection with the base station is determined. The means is configured to connect to the plurality of base stations before the handover processing means performs the handover processing, so that it is possible to reduce a failure such as data loss during the handover processing.

Further, there is provided communication state detecting means for detecting the deterioration of the communication state. When the communication state detecting means detects that the communication state has deteriorated, the base station connecting means connects to the plurality of base stations. By configuring
It is possible to suppress a failure such as data loss at the time of a communication failure to a small extent.

Further, there is provided communication means for transmitting data in packet units, handover judgment means for judging the necessity of handover, and handover processing means for performing handover processing. When it is determined that a data loss has occurred, the communication means may shorten the data packet length and transmit the data to the base station before the handover processing means performs the handover processing. Can be reduced to a small extent.

The communication means for transmitting data to the connected base station, the handover judgment means for judging the necessity of handover, the handover processing means for performing handover processing, and the data transmission operation of the communication means. And a data transmission completion detecting means for detecting that all data transmitted to the connected base station has been transmitted to the PHS connecting means, wherein the data transmission controlling means performs the handover determination. When the means determines that the necessity of handover has arisen, the communication means controls to stop data transmission, and the handover processing means determines that all data transmitted to the base station by the data transmission completion detection means is the PHS. Handover processing is performed after detecting that it has been transmitted to the Over data transmission control means, after the handover process by the handover processing means is completed,
By configuring the communication means to start data transmission, there is no need to retransmit the same data after handover, and high-speed data communication can be performed.

The data transmission from each of the base stations 104 and 105 to the PHS connection means may be performed in units of radio frames, or may be performed in units of a plurality of radio frames (for example, PIAF). It may be.

As a PHS portable terminal device, P
The present invention is applicable to various portable terminal devices used for PHS, such as an HS telephone and a card with a built-in PHS.

[0076]

According to the PHS of the present invention, high-speed and high-quality data communication can be performed. In addition, even when handover occurs or when the communication state deteriorates, high-speed and high-quality data communication can be performed.

According to the PHS portable terminal device of the present invention, high-speed and high-quality data communication can be performed. In addition, even when handover occurs or when the communication state deteriorates, high-speed and high-quality data communication can be performed.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a PHS used in an embodiment of the present invention.

FIG. 2 is a diagram showing a data flow in the first embodiment of the present invention.

FIG. 3 is a flowchart showing a process according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating processing according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a process according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating a process according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing a process according to the second embodiment of the present invention.

FIG. 8 is a flowchart illustrating processing according to a third embodiment of the present invention.

FIG. 9 is a flowchart showing processing according to a fourth embodiment of the present invention.

[Explanation of symbols]

 101: PHS portable terminal device 102: Wireless unit 103: Control unit 104, 105: Base station 106: Server 107: Internet 108: Web server 109: partner Destination computer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 1/725 H04L 13/00 S 3/00 305C H04Q 7/22 H04Q 7/04 K 7/28 F term (Reference) 5K027 AA11 BB03 CC08 EE00 5K033 CB03 CB06 CC02 DA02 DA06 DA19 EA02 5K034 EE03 KK25 LL07 MM02 5K051 AA02 BB02 CC07 DD15 HH01 5K067 AA33 BB04 BB08 BB21 CC10 CC14 DD45 EEDDEE DDEE DDEE DD DD DD DD DD DD

Claims (11)

[Claims] 1. A PHS wherein data is transmitted from the PHS portable terminal device to a desired destination by performing wireless communication between the PHS portable terminal device and a base station.
In the above, the PHS mobile terminal device is connected to a plurality of the base stations, the same data is transmitted from the PHS mobile terminal device to each of the base stations, and the data received by each of the base stations is transmitted to the PHS. A data communication method in a PHS, wherein one of the data received by the connection means and received from each of the base stations is transmitted to the other party. 2. The PHS according to claim 1, wherein data transmission from each of the base stations to the PHS connection unit is performed in units of radio frames or in units of a plurality of radio frames. Data communication method. 3. When it is determined that a handover is necessary in the PHS portable terminal device, the PHS portable terminal device is connected to a plurality of the base stations before performing a handover process, and the PHS portable terminal device is connected to the plurality of base stations. 2. The data communication method according to claim 1, wherein the same data is transmitted from the terminal device to the plurality of connected base stations. 4. When the PHS portable terminal detects a deterioration of a communication state, the PHS portable terminal is connected to a plurality of base stations, and the PHS portable terminal is connected to the plurality of connected base stations. 2. The data communication method according to claim 1, wherein the same data is transmitted to the station. 5. A PHS in which data is transmitted from the PHS portable terminal device to a desired destination by performing wireless communication between the PHS portable terminal device and a base station.
In the above, when the PHS portable terminal device performs handover from one base station to another base station, the PHS portable terminal device transmits to the one base station when it determines that the necessity of handover has occurred. A data communication method in a PHS, wherein a packet length of data to be transmitted is shortened. 6. A PHS in which data is transmitted from the PHS portable terminal device to a desired destination by performing wireless communication between the PHS portable terminal device and a base station.
In the above, data is transmitted from the PHS portable terminal device to one base station, data received by the one base station is transmitted to PHS connection means, and data received by the PHS connection means is transmitted to the destination. When the PHS portable terminal device performs handover from the one base station to another base station, the handover is performed after all data received by the one base station is transmitted to the PHS connection means. PH characterized by doing
Data communication method in S. 7. A PHS portable terminal device configured to transmit data to a desired destination by performing wireless communication with a base station, comprising: a base station connecting means for connecting to a plurality of the base stations; Communication means for transmitting the same data to each of the base stations. 8. A base station connecting means, comprising: a handover judging means for judging the necessity of a handover; and a handover processing means for performing a handover process. 8. The PHS portable terminal device according to claim 7, wherein the mobile terminal connects to a plurality of the base stations before the handover processing unit performs the handover process. 9. A base station connecting means for connecting to a plurality of base stations when the communication state detecting means detects that the communication state has deteriorated, the communication state detecting means detecting a deterioration of the communication state. The PHS portable terminal device according to claim 7, wherein: 10. A PH configured to transmit data from the PHS portable terminal device to a desired destination by performing wireless communication between the PHS portable terminal device and a base station.
The portable terminal device for S comprises communication means for transmitting data in packet units, handover judgment means for judging the necessity of handover, and handover processing means for performing handover processing. The PHS portable terminal device, characterized in that, when it is determined that the communication has occurred, the communication means transmits the data to the base station after shortening the data packet length before the handover processing means performs the handover processing. 11. A PHS configured to transmit data to a desired destination by performing wireless communication with a base station.
Communication means for transmitting data to the connected base station, handover determination means for determining necessity of handover, handover processing means for performing handover processing, and data transmission operation of the communication means. And data transmission completion detecting means for detecting that all data transmitted to the connected base station has been transmitted to the PHS connecting means, wherein the data transmission controlling means comprises: When the determining means determines that the necessity of handover has occurred, the communication means controls so as to stop data transmission, and the handover processing means controls all data transmitted to the base station by the data transmission completion detecting means. PH
A handover process is performed after detecting the transmission to the S connection unit, and the data transmission control unit controls the communication unit to start data transmission after the handover process by the handover processing unit is completed. A portable terminal device for a PHS, comprising: