JP2001218276A - Data communication method and equipment in mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data communication method and equipment with which inconvenience of data communication can surely and efficiently be coped with on the occurrence of the nonconformities in data communication. SOLUTION: In the data communication method, a transmitter station device transmits data in a prescribed unit, reaches a response wait state after the transmission of the final unit of data, in the case of sending data to a receiver station device in a mobile communication system, the reception station device sequentially receives the data from the transmission station device in a prescribed unit, transmits a reception end acknowledgement signal to the transmission station device when receiving the final unit of data, the transmission station device transmits confirmation information to the receiver station device, when a reply waiting state is consecutive for a prescribed time without receiving the reception end acknowledgement signal, the reception station device receiving the confirmation information transmits confirmation acknowledgement information, depending on a state of the reception station device at the reception of the confirmation information, and the transmission station device receiving the confirmation acknowledgement information conducts processing, depending on the confirmation acknowledgement information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication method and apparatus in a mobile communication system, and more particularly, to inconvenience in data communication when data is transmitted from a transmitting station to a receiving station in a mobile communication system. The present invention relates to a data communication method and apparatus capable of reliably and efficiently coping with the inconvenience when there is a problem.

[0002]

2. Description of the Related Art Conventionally, there is a mobile communication system which connects a mobile device (such as a mobile phone) and an information providing server via a mobile packet communication system to realize various information providing services and mail sending / receiving services for the mobile device. Has been realized. In such a mobile communication system, since data communication is performed with respect to a mobile device via a wireless transmission path, there is a possibility that a part of received data may be missing or erroneous, and the data may be transmitted via a wired transmission path. Higher than communication.

[0003] In order to cope with the loss or error of data transmitted and received in the course of data communication in such a mobile communication system, the following methods have conventionally been adopted.

First, in the first method, a transmitting station device (for example, installed in an exchange) sequentially transmits data in packet units, for example, in a process of sequentially transmitting data for a predetermined time after finishing transmission of the last packet. Even after elapse, the receiving station device (for example,
If there is no response (reception completion response) from the mobile device)
Retransmit the transmitted data.

[0005] In the second method, when a receiving station detects packet loss or error in the course of receiving packets sequentially, a request for retransmission of the lost or incorrect packet is sent to the transmitting station. When the transmitting station receives the retransmission request, the transmitting station transmits a packet related to the request to the receiving station.

According to such a method, even if inconvenience such as data loss or error occurs in data communication in the mobile communication system, it is possible to receive appropriate data in the receiving station device.

[0007]

However, according to the first method, when there is no reception completion response from the receiving station, the transmitting station checks the data (packet) in which the missing or error has occurred in the receiving station. Therefore, all data (packets) transmitted once must be retransmitted. For this reason, efficient data communication is impaired.

In the second method, if there is no retransmission request from the receiving station device, the transmitting station device determines that the receiving station device has normally received the packet and continues to transmit the packets sequentially. . However, when the retransmission request from the receiving station device is lost on the wireless transmission path due to fading or when the retransmission request cannot be transmitted due to a temporary failure of the receiving station device, the receiving station device retransmits the packet. Despite the necessity to receive the retransmission request, the transmitting station device may not be able to receive the retransmission request. In such a case, the receiving station apparatus cannot receive the missing or erroneous packet retransmission.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data communication method and apparatus capable of reliably and efficiently coping with inconvenience in data communication.

[0010]

According to a first aspect of the present invention, there is provided a data communication method for transmitting data from a transmitting station to a receiving station in a mobile communication system. When transmitting data, the transmitting station transmits data in predetermined units, waits for a response after transmitting the last unit of the data, and the receiving station transmits data from the transmitting station for each predetermined unit. Sequentially, and transmits a reception completion response signal to the transmission station device when the final unit of data is received, and the transmission station device waits for a predetermined time without receiving the reception completion response signal. When the continuation, the confirmation information is transmitted to the receiving station device, and the receiving station device receiving the confirmation information,
When transmitting the acknowledgment information according to the status of the receiving station device at the time of receiving the acknowledgment information to the transmitting station device, the transmitting station device having received the acknowledgment information performs processing according to the acknowledgment information. Be composed.

In such a data communication method, the transmitting station transmits the data to the receiving station sequentially in predetermined units, transmits the final unit, and then transmits a reception completion response signal from the receiving station for a predetermined time. If not, the transmitting station transmits confirmation information to the receiving station. Then, the receiving station device returns acknowledgment information according to the situation at the time of receiving the acknowledgment information. Therefore, the transmitting station device can grasp the status of the receiving station device based on the acknowledgment information, and can perform processing according to the status.

In view of the fact that the receiving station apparatus can properly and efficiently cope with a situation where the final unit of the data has not been properly received, the present invention provides the above-described data processing apparatus. In the communication method, when the receiving station device has not yet properly received the final unit of data at the time of receiving the confirmation information, at least the data unit not yet normally received including the final unit is transmitted. It can be configured to transmit a retransmission request as the acknowledgment information.

[0013] Further, even though the receiving station apparatus normally received the data up to the final unit and transmitted the reception completion signal, the reception completion signal did not reach the transmission station apparatus for any reason. In view of the fact that the receiving station device can receive the acknowledgment information at the time of receiving the acknowledgment information, the present invention provides the above-described data communication method. When transmitting a signal, the reception completion response signal may be retransmitted as the acknowledgment information.

Furthermore, when the receiving station apparatus sequentially receives data and receives the final unit of the data, it accurately and efficiently copes with a situation where no data unit other than the final unit has been received. In view of the fact that the present invention is applicable, the present invention provides, in each of the above data communication methods, the receiving station apparatus which normally receives another unit of data at the time of receiving the last unit of data. Otherwise, instead of the reception completion response signal, a retransmission request for another unit of data not normally received is transmitted to the transmitting station, and the transmitting station receiving the retransmission request transmits the retransmission request. Can be configured to be transmitted to the receiving station device again.

[0015] As described in claim 5, the transmitting station apparatus can transmit a packet as a data unit.

Further, in view of the fact that the receiving unit can easily determine the final unit of data, the present invention provides a sixth aspect of the present invention.
As described in the above, in each of the above data communication methods,
The transmitting station apparatus can be configured to add a code indicating the last unit to the last unit of data and transmit the data.

Further, from the viewpoint that information indicating the last unit of data can be efficiently transmitted to the receiving station device, the present invention provides the above data communication method. In the above, the transmitting station apparatus may be configured to transmit a signal indicating the end of data transmission, including a final unit of the data.

In order to solve the above problem, the present invention provides a transmitting station in a mobile communication system for transmitting data to a receiving station, wherein the data is transmitted in predetermined units. In doing so, a timer means for starting time measurement after transmitting the last unit of the data, and when the time measured by the timer means reaches a predetermined time without receiving a reception completion response signal from the receiving station device. A confirmation information transmitting unit that transmits confirmation information to the receiving station device, and when receiving confirmation response information from the receiving station device after transmitting the confirmation information by the confirmation information transmitting unit, It is configured to include a processing unit that performs a process according to the confirmation response information.

According to another aspect of the present invention, there is provided a receiving station apparatus in a mobile communication system for receiving data sequentially transmitted from a transmitting station apparatus in predetermined units. A receiving completion response unit for transmitting a reception completion response signal to the transmitting station device when the final unit of data is received, while the data is being sequentially received for each predetermined unit; and And confirming means for transmitting, when receiving the confirmation information from the transmitting station apparatus before transmitting the reception completion response signal, acknowledgment information corresponding to the state of the receiving station apparatus to the transmitting station apparatus at the time of the reception. It is configured as follows.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

A basic configuration of a mobile communication system to which a data communication method and apparatus according to an embodiment of the present invention is applied is, for example, as shown in FIG.

In FIG. 1, a mobile device 1 such as a portable telephone is shown.
The base station 20 that performs wireless communication with the base station 0 is connected to the exchange 30. The exchange 30 is connected to a packet communication network P-NW. The packet communication network P-NW further connects various information terminals and information providing servers, and is connected to another network such as the Internet.

In such a mobile communication system, data addressed to the mobile device 10 received by the packet communication network is transmitted to the mobile device 10 via the exchange 30 and the base station 20.
In addition, data transmitted from the mobile device 10 (such as e-mail)
Is transmitted to the packet communication network P-NW via the base station 20 and the exchange 30.
The data is transmitted from W to a destination information terminal, a server, or another network such as the Internet.

In the above mobile communication system,
Normally, for example, data communication is performed between the mobile device 10 and a communication device provided in the exchange 30, for example, according to a procedure as shown in FIG. In FIG. 2,
The mobile device 10 is indicated as “user”, and a communication device that performs data communication with the mobile device 10 is indicated as “NW” (hereinafter the same).

In FIG. 2, when data (for example, mail) is transmitted from the mobile device 10, the mobile device 10 (user)
Sends a transmission start request (Open Request (Data))
The communication device (NW) receiving the transmission start request (Open Request (Data)) responds to the transmission start request (Open
Acknowledge) is transmitted to the mobile device 10. Communication with the mobile device 10 (user) from the time when the mobile device 10 (user) transmits this transmission start request (Open Request (Data)) to the time when the communication device (NW) transmits the response (Open Acknowledge). A predetermined negotiation is performed with the device (NW) to confirm various rules regarding data communication, for example, the maximum number of packets (window size) transmitted for one request. In this example, the window size is confirmed as “3”.

As described above, the mobile station 10 (user) responds to the transmission start request from the communication device (NW) (Open
Acknowledge), the mobile device 10 (user)
Is data of a predetermined length in packet units Data (0), Data (1),
Transmit to Data (2) F sequentially. In this data transmission, a sign “F” indicating that the packet is the last packet is added to the last packet Data (2). Each of the above packets
The number in parentheses in Data (number) indicates a serial number.

The mobile station 10 (user) sends the final packet
After transmitting Data (2) F, the system enters a response waiting state and starts the internal timer. On the other hand, the communication device (NW) sequentially receives the packets transmitted from the mobile device 10 (user), and upon receiving the packet Data (2) F, the code “F” indicates that the packet is the last packet. To detect. Then, upon receiving the final packet Data (2) F, the communication device (NW) transmits a reception completion response signal (Data Acknowledge) to the mobile device 10 (user).

Mobile station 10 (user) in response waiting state
When the communication timer (NW) receives the reception completion response signal (Data Acknowledge) before the internal timer reaches the predetermined time TM_R2, it determines that all the transmitted packets have been normally received by the communication device (NW). On the other hand, a communication device (NW)
After transmitting the reception completion response signal (Data Acknowledge), if there is data (for example, mail) addressed to the mobile device 10 (user), the data is transmitted in packet units Data (0), D
Ata (1) and Data (2) are sequentially transmitted to the mobile device 10 (user). In this case, the final packet Data (2) is included in the end request signal (Close Request (Data (2))) and transmitted. After transmitting the close request signal (Close Request (Data (2))) including the final packet Data (2), the communication device (NW) enters a response waiting state and starts the internal timer.

The mobile station 10 (user) receives data sequentially transmitted in packet units from the communication device (NW) as described above. Then, the mobile device 10 (user)
End request signal including the last packet Data (2) (Close Reque
When st (Data (2))) is received, the packet Data (2) is determined to be the last packet, and a response signal (Close Acknowledge) to the end request signal is transmitted.

The communication device (NW) in the response waiting state as described above receives a response signal (Close Acknowledge) to the end request signal from the mobile device 10 (user) before the internal timer reaches the predetermined time TM_R3. The mobile station 10 (user) recognizes that all packets have been received normally. Then, the data communication between the mobile device 10 (user) and the communication device (NW) is terminated.

[0031] The mobile device 10 which is performed in the above-described procedure.
In the process of data communication between the (user) and the communication device (NW), if a packet is not normally received due to a packet loss or an error, processing is performed according to the following procedure.

For example, from the communication device (NW) to the mobile device 10
If the last packet is lost in the process of transmitting data to the (user), processing is performed according to the procedure shown in FIG.

A start request (Ope) from the mobile device 10 (user)
n Request), the communication device (NW) receives a response (Open Ackno
wledge) to the mobile device 10 (user), and then transmits data addressed to the mobile device 10 (user) in packet units.
(0), Data (1), and Data (2) are sequentially transmitted. Mobile device 10
(User) responds to the start request (Open Ackno
wledge), data from the communication device (NW) is sequentially received in packet units.

In such a process, the final packet Data (2)
Is lost, the mobile station 10 (user) does not transmit a reception completion response signal (Data Acknowledge) because reception of the final packet Data (2) is not confirmed. On the other hand, after transmitting the final packet Data (2), the communication device (NW)
In response waiting state, the internal timer is started.
Then, as described above, the reception completion response signal (Data Acknowledge) is not transmitted from the mobile device 10 (user), and the internal timer reaches the predetermined time TM_R2 without receiving the reception completion response signal (Data Acknowledge). , The communication device (NW) transmits a confirmation signal (Response Request) to the mobile device 10 (user).

When the mobile station 10 (user) waiting for the final packet Data (2) receives the confirmation signal (Response Request) from the communication device (NW), the time when the confirmation signal (Response Request) is received Is a state in which the last packet Data (2) is not received, the mobile device 10 (user) sends a retransmission request (Data Request (0,011)) of the last packet Data (2) to the above-mentioned confirmation signal. The response is transmitted to the communication device (NW). Note that (0,011) in the retransmission request (Data Request (0,011)) is data communication (0 at the left end) from the serial number “0”, and packets with serial numbers “0” and “1” have been received (right end). Indicate that the serial number “2” has not been received yet (the third 0 from the right end).

The communication device (NW) transmits the final packet Da
Upon receiving the retransmission request of ta (2) (Data Request (0,011)), the mobile station 10 transmits the final packet Data (2) F related to the request.
(User). And the mobile device 10
Upon receiving the final packet Data (2) F, the (user) transmits a reception completion response signal (Data Acknowledge (3)) to the communication device (NW). Note that (3) in this reception completion response signal (Data Acknowledge (3)) means a request for the next data starting from the packet of serial number 3.

According to the above procedure, the communication device (N
Last packet Data among packets transmitted from W)
If (2) is not received by the mobile device 10 (user), the communication device (NW) retransmits the final data Data (2) transmitted from the mobile device 10 (user) in response to the confirmation signal (Response Request). Request (Data Request (0,011))
, It is possible to reliably retransmit only the missing final data Data (2) to the mobile device 10 (user).

Next, for example, if all the packets are lost in the process of transmitting data from the communication device (NW) to the mobile device 10 (user), the processing is performed according to the procedure shown in FIG. .

In FIG. 4, similarly to the example shown in FIG.
After a start request (Open Request) and a response (OpenAcknowledge) to the start request have been transmitted and received between the mobile device 10 (user) and the communication device (NW), the communication device (NW) changes to the mobile device 10 (user). ) Is sequentially transmitted in packet units Data (0), Data (1), and Data (2) F. In this process, all packets Data (0), Data (1), Data (2) F
Is missing, the mobile device 10 (user) continues to wait for reception of those packets.

On the other hand, the communication device (NW)
After transmitting Data (2) F, the device enters a response waiting state and starts the internal timer. When there is no response from the mobile device 10 (user) and the internal timer reaches the predetermined time TM_R2, the communication device (NW) transmits a confirmation signal (Response Reque).
st) to the mobile device 10 (user).

As described above, when the mobile station 10 (user) waiting to receive a packet receives a confirmation signal (Response Request) from the communication device (NW), the time when the confirmation signal (Response Request) is received Is a situation in which not all packets have been received,
0 (user) responds to the acknowledgment signal (Response Request) by requesting retransmission of all packets (Data Acknowledge).
edge (0)) to the communication device (NW). (0) in the retransmission request (Data Acknowledge (0))
This indicates that the packet related to the retransmission request is all packets from the serial number “0”.

As described above, the confirmation signal (Response Reque
After transmitting (st), the communication device (NW), which has received a retransmission request (Data Acknowledge) for all packets as a response, transmits packets Data (0) and Data (0) from the serial number “0” related to the request. 1), Data (2) F are sequentially transmitted.
Then, these packets Data (0), Data (1), Data (2) F
When the mobile device 10 (user) sequentially receives the final packet Data (2) F, it transmits a reception completion response signal (Data Acknowledge (3)) to the communication device (NW).

According to the above procedure, the communication device (N
W) all packets transmitted from Data (0), Data (1),
When Data (2) is not received by the mobile device 10 (user), the communication device (NW) transmits a confirmation signal (Response Reque).
Based on all retransmission requests (Data Acknowledge (0)) transmitted from the mobile device 10 (user) as a response to st), all missing packets are reliably retransmitted to the mobile device 10 (user). Can be.

Further, for example, in the process of transmitting data from the communication device (NW) to the mobile device 10 (user), all packets are normally received, but the mobile device 10 (user) transmits data to the mobile device 10 (user). When a response signal transmitted to ()) is lost, processing is performed in a procedure as shown in FIG.

In FIG. 5, similarly to the examples shown in FIGS. 3 and 4, a start request (Open Request) and a response to the start request (Open Request) are made between the mobile station 10 (user) and the communication device (NW). After the transmission / reception of the acknowledgment, the communication device (NW) sequentially transmits the data addressed to the mobile device 10 (user) in packet units Data (0), Data (1), and Data (2) F. When the mobile station 10 (user) receives these packets normally and confirms that the final packet Data (2) F has been received, the reception completion response signal (Data Acknowled)
ge (3)) to the communication device (NW).

In the above process, after transmitting the final packet Data (2) F, the communication device (NW) enters a response waiting state and starts the internal timer. In this state, a reception completion response signal (Da is received) as a reception response of the last packet Data (2) F.
If the internal timer reaches a predetermined time TM_R2 when the communication device (NW) does not reach the communication device (NW) due to the lack of ta acknowledge (3)), the communication device (NW) transmits the acknowledgment signal (Response Reques
t) to the mobile device 10 (user).

The mobile device 10 (user) communicates with the communication device (N
When the confirmation signal (Response Request) from (W) is received, the condition at the time when the confirmation signal (Response Request) is received is a situation where the reception completion response signal (Data Acknowledge (3)) has already been transmitted. A completion response signal (Data Acknowledge) is transmitted again.

This reception completion response signal (Data Acknowledge)
The communication device (NW) that has received (3)) recognizes that the data starting from the serial number 0 has been normally received by the mobile device 10 (user), and recognizes the next data included in the reception completion response signal. In response to the request, a packet from the serial number 3 which is the next data is sequentially transmitted to the mobile device 10 (user) (not shown).

According to the above procedure, the mobile station 10
(User) reception completion response signal (Data Acknowledge
When (3)) does not reach the communication device (NW), the communication device (NW) retransmits a reception completion response signal (Data Acknowledge (Data Acknowledge) from the mobile device 10 (user) as a response to the confirmation signal (Response Request). By 3)), it is possible to confirm that all the packets have been received by the mobile device 10 (user). Therefore, the communication device (NW)
Appropriate measures can be taken based on the reception completion response signal (Data Acknowledge (3)). Further, for example, when a packet other than the last packet is lost in the process of transmitting data from the communication device (NW) to the mobile device 10 (user), a process in a procedure as shown in FIGS. Is performed.

In FIG. 6, a start request (Open Request) and a response to the start (Open Acknowledge) are made between the mobile device 10 (user) and the communication device (NW), as in the above-described example.
edge), the communication device (NW) transmits the packet Data (0), Data (1), Da addressed to the mobile device 10 (user).
Transmit ta (2) F sequentially. In the process of sequentially receiving packets from the communication device (NW), the mobile device 10 (user) confirms the received packet by referring to the serial number of each packet.

In the process of transmitting packets sequentially from the communication device (NW) to the mobile device 10 (user) as described above, for example, it is assumed that packet Data (1) is lost. In this case, the mobile device 10 (user) transmits the final packet Data (2) F
After confirming the reception of the packet Data (1), if it detects that the reception confirmation of the packet
The retransmission request (Data Request (0,101)) of (1) is transmitted to the communication device (NW).

The communication device (NW) transmits the last packet Data
(2) After sending F, it enters the response waiting state and starts the internal timer. Then, before the internal timer reaches the predetermined time TM_R2, the communication device (NW)
Upon receiving the retransmission request (DataRequest (0,101)) from the (user), it transmits the packet Data (1) related to the retransmission request to the mobile device 10 (user) again.

The mobile device 10 (user) communicates with the communication device (N
When the packet Data (1) retransmitted from W) is received, it is determined that all the packets have been received, and the reception completion response signal (Da
ta Acknowledge (3)) to the communication device (NW).

FIG. 7 shows an example of a communication device (NW).
To the mobile station 10 (user) from the packet Data (0), D
In the process of sequentially transmitting ata (1) and Data (2) F, packet Data
(0) and Data (1) are missing. In this case, when the mobile device 10 (user) detects that the reception confirmation of the packets Data (0) and Data (1) has not been performed after receiving the final packet Data (2) F, the packet Da (2)
A retransmission request (Data Request (0,100)) for ta (0) and Data (1) is transmitted to the communication device (NW).

The communication device (NW) transmits the final packet Data (2) F
When the internal timer receives the retransmission request (Data Request (0,100)) before the internal timer reaches the predetermined time TM_R2, it transmits packets Data (0) and Data (1) related to the request in order. Then, after transmitting the final packet Data (1) relating to the retransmission request, the communication device (NW) enters a waiting state and starts the internal timer again.

As described above, when the non-final packet Data (0) among the packets retransmitted from the communication device (NW) is lost, the mobile device 10 (user) receives the final packet Data (1) retransmitted. After the above missing packet D
The retransmission request of ata (0) (Data Request (0,110)) is transmitted again to the communication device (NW).

As described above, the communication device (N
W) is a request for retransmission (Data Reque) from the mobile device 10 (user) before the internal timer reaches the predetermined time TM_R2.
When st (0,110)) is received, packet Data (0) relating to the retransmission request is transmitted again to mobile device 10 (user).

When the mobile station 10 (user) receives the packet Data (0) relating to the retransmission request again, the mobile station 10 (user) determines that all the packets have been received and receives a reception completion response signal (Da
ta Acknowledge (3)) to the communication device (NW).

In the example shown in FIGS. 6 and 7, after the communication device (NW) transmits the last packet Data (2) F or the last packet Data (1) in retransmission, a response (retransmission request) is received. Instead, the internal timer is set to the predetermined time TM_R.
2, the communication device (NW) as in the example described above.
Transmits confirmation information (Response Request) to the mobile device 10 (user). Then, the mobile device 10 (user) transmits a response according to a situation at the time of receiving the confirmation information (ResponseRequest), for example, a situation in which the final packet has not been received or a situation in which the retransmission request has already been transmitted, to the communication device. (NW).

In each of the examples shown in FIGS. 3 to 7 described above, the mobile station 10 (user) uses the code F added to the last packet among the packets sequentially transmitted from the communication device (NW). Detecting the last packet,
As described in the normal processing procedure shown in FIG.
By including the final packet in the end request signal (Close Request), the mobile station 10 (user) can detect the final packet.

As described above, the end request signal (Close Requests)
An example in which the last packet is included in t) is shown in FIGS.

In FIG. 8, the communication device (NW) transmits packets Data (0) and Data (1) sequentially,
(2) is included in the close request signal (Close Request (Data (2))) and transmitted. Then, the communication device (NW) transmits a final request signal (Close Request (Dat
After sending a (2))), the system enters the response waiting state and starts the internal timer.

The mobile station 10 (user) is a communication device (NW)
If a close request signal (Close Request (Data (2))) is lost in the process of sequentially receiving packets from the mobile station 10, the mobile device 10 (user) continues to wait for the close request signal. In this state, the communication device (NW) does not respond to the end request signal, and the internal timer sets the predetermined time TM_R3
Mobile device 1 sends confirmation information (Response Request)
0 (user). And the confirmation information (Resp
After transmitting the onse request, the communication device (NW) starts an internal timer.

The mobile station 10 (user) receiving the confirmation information (Response Request) receives the confirmation information (Response Request).
Request), the last packet has not yet been received, so that the retransmission request (Data Request
(0,011)) to the communication device (NW). When the communication device (NW) receives this retransmission request (Data Request (0,011)) before the internal timer started after transmitting the above confirmation information (Response Request) reaches the predetermined time TM_R5, the final packet related to the retransmission request The mobile station 1 transmits a close request signal (Close Request (Data (2))) including Data (2).
0 (user).

The retransmitted end request signal (Close Requ
est (Data (2))), the mobile device 10 (user)
A termination response signal (Close Acknowledge (3)) is transmitted.
The end response signal (Close Acknowledge (3)) also includes a request for the next packet starting from the serial number 3.

In the example shown in FIG. 9, when Data (1) other than the last packet Data (2) is lost in the process of transmitting packets sequentially from the communication device (NW) to the mobile device 10 (user), The mobile device 10 transmits a close request signal (Close Request (Data) including the last packet Data (2) from the communication device (NW).
After receiving (2)), the communication device (NW) sends a retransmission request (Data Request (0,101)) for the missing packet Data (1).
Send to When the communication device (NW) receives the retransmission request (Data Request (0, 101)) before the internal timer reaches the predetermined time TM_R2, the communication device (NW) transmits the packet Data (1) related to the request to the mobile station 10. (User). The mobile station 10 (user) that has received the retransmitted packet Data (1) transmits a termination response signal (Close Acknowledge (3)) to the communication device, assuming that all data has been received.

Each of the examples shown in FIGS. 3 to 9 corresponds to a communication device (N
W) functions as a transmitting station device for transmitting data, and the mobile device 10 (user) functions as a receiving station device for receiving data. However, the mobile device 10 (user) transmits data to the communication device (NW) from the mobile device 10 (user). Is transmitted, processing such as packet retransmission can be performed in the same procedure.

In each of the above examples, the communication device (NW) for performing data communication with the mobile device 10 is provided in the exchange 30, but the system configuration is not limited to this. A communication device (NW) that performs data communication with the mobile device 10 can be provided in any of the base station 10, the switch 30, and the packet communication network.

[0069]

As described above, according to the present invention as set forth in claims 1 through 17, after the transmitting station has transmitted data to the final unit, the receiving completion response signal is received from the receiving station due to some inconvenience. Is not received for a predetermined time, the transmitting station transmits acknowledgment information to the receiving station, and the receiving station transmits an acknowledgment signal as a response to the acknowledgment to the transmitting station. The device can grasp the status of the receiving station device based on the acknowledgment information, and can perform processing according to the status. As a result, when an inconvenience occurs in data communication, the inconvenience can be dealt with reliably and efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a basic configuration of a mobile communication system to which data communication and an apparatus according to an embodiment of the present invention are applied.

FIG. 2 is a sequence diagram illustrating an example of a communication procedure in normal data communication.

FIG. 3 is a sequence diagram illustrating a first example of a communication procedure when a packet is lost.

FIG. 4 is a sequence diagram showing a second example of a communication procedure when a packet is lost.

FIG. 5 is a sequence diagram showing a third example of a communication procedure when a response signal is lost.

FIG. 6 is a sequence diagram showing a fourth example of a communication procedure when a packet is lost.

FIG. 7 is a sequence diagram showing a fourth example of a communication procedure when a packet is lost.

FIG. 8 is a sequence diagram showing a fifth example of a communication procedure when a packet is lost.

FIG. 9 is a sequence diagram showing a sixth example of a communication procedure when a packet is lost.

[Description of Signs] 10 mobile device 20 base station 30 exchange

Continuation of the front page (72) Inventor Kenichi Yakura 2-10-1 Toranomon, Minato-ku, Tokyo NTT Mobile Communications Network Co., Ltd. F-term (reference) 5K030 GA12 HA08 HC01 JL01 JT02 JT09 LA01 LD18 MA01 MB18 5K067 AA02 AA11 AA33 BB04 BB21 CC08 DD24 EE02 EE10 EE16 GG01 GG11 HH05 HH21 HH22 9A001 BB04 CC05 CC07 DD10 HH34 JJ12

Claims (17)

[Claims] When transmitting data from a transmitting station to a receiving station in a mobile communication system, the transmitting station transmits data in predetermined units and waits for a response after transmitting the last unit of the data. The receiving station device sequentially receives data from the transmitting station device for each of the predetermined units, and transmits a reception completion response signal to the transmitting station device when the last unit of data is received; When the response waiting state has continued for a predetermined time without receiving the reception completion response signal, the receiving station device transmits confirmation information to the receiving station device. Transmitting the acknowledgment information according to the status of the receiving station device to the transmitting station device, and receiving the acknowledgment information, the transmitting station device performs a process according to the acknowledgment information. Method. 2. The data communication method according to claim 1, wherein the receiving station device includes at least the final unit if the final unit of data has not been normally received when the confirmation information is received. A data communication method in which a retransmission request for a data unit that has not been received normally is transmitted as the acknowledgment information. 3. The data communication method according to claim 1, wherein the receiving station device transmits the reception completion response signal when the reception completion device has already transmitted the reception completion response signal at the time of receiving the confirmation information. A data communication method wherein the data is retransmitted as the acknowledgment information. 4. The data communication method according to claim 1, wherein the receiving station device completes the reception when the other unit of data is not normally received at the time of receiving the last unit of data. In place of the response signal, a retransmission request for another unit of data that has not been normally received is transmitted to the transmitting station device, and the transmitting station device that has received the retransmission request transmits another unit of data related to the retransmission request. A method of transmitting data to the receiving station device again. 5. The data communication method according to claim 1, wherein the transmitting station device transmits data in packet units. 6. The data communication method according to claim 1, wherein said transmitting station apparatus transmits a data by adding a code indicating the last unit to the last unit of data. 7. The data communication method according to claim 1, wherein said transmitting station apparatus transmits a signal indicating the end of data transmission including a final unit of said data. 8. A transmitting station in a mobile communication system for transmitting data to a receiving station, wherein when transmitting data in predetermined units, a timer for starting time measurement after transmitting the last unit of the data. Means, when the time measured by the timer means reaches a predetermined time without receiving a reception completion response signal from the receiving station device,
Confirmation information transmitting means for transmitting confirmation information to the receiving station device; and transmitting confirmation information after transmitting the confirmation information by the confirmation information transmitting device, and receiving confirmation response information for the confirmation information from the receiving station device. A transmitting station device having processing means for performing a process according to response information. 9. The transmitting station device according to claim 8, wherein said processing means receives the acknowledgment information from the receiving station device as acknowledgment information.
A transmitting station device having first data retransmitting means for retransmitting a data unit related to the retransmission request to the receiving station device when receiving a retransmission request for a data unit including at least the last unit of the data . 10. The transmitting station apparatus according to claim 8, wherein the receiving unit receives the reception completion response signal from the receiving station apparatus before the time measured by the timer means reaches the predetermined time. A transmitting station device having a second data retransmitting means for, when receiving a retransmission request for a unit other than the last unit of data from a station device, transmitting the data unit related to the retransmission request to the receiving station device again. 11. The transmission station device according to claim 8, wherein data transmission is performed in packet units. 12. The transmitting station device according to claim 8, wherein a code indicating the last unit is added to the last unit of data and transmitted. 13. The transmission station apparatus according to claim 8, wherein a signal indicating the end of data transmission is transmitted including a final unit of said data. 14. A receiving station device in a mobile communication system for receiving data sequentially transmitted in predetermined units from a transmitting station device, wherein when the data is sequentially received in predetermined units, a final unit of the data is determined. A reception completion response means for transmitting a reception completion response signal to the transmission station apparatus when receiving, when the reception completion response means receives confirmation information from the transmission station apparatus before transmitting the reception completion response signal, A receiving station device having acknowledgment means for transmitting acknowledgment information according to the status of the receiving station device at the time of the reception to the transmitting station device. 15. The receiving station device according to claim 14, wherein said acknowledgment means includes at least the final unit if the final unit of data has not been normally received at the time of receiving said acknowledgment information. A receiving station device having first retransmission request means for transmitting, as the acknowledgment information, a retransmission request for a unit of data not normally received. 16. The receiving station device according to claim 14, wherein said confirmation response means transmits said reception completion response signal when said confirmation information has been received and has already transmitted said reception completion response signal. A receiving station device having a reception completion response retransmitting means for retransmitting the same as the acknowledgment signal. 17. The receiving station apparatus according to claim 14, wherein when another unit of data is not normally received at the time of receiving the last unit of data, the data is transmitted from the reception completion response unit. A receiving station device having second retransmission request means for transmitting, to a transmitting station device, a retransmission request for another unit of the data that has not been normally received, instead of a reception completion response signal to be received.