Network system, data transmission device, terminal device and multicasting method

• US 20060059407A1
• Filed: 02/03/2005
• Published: 03/16/2006
• Est. Priority Date: 09/16/2004
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Koizumi, Yoshiko, Sugiyama, Katsumasa, Wang, Tingting
• Application Number:
  US11/050,612
• Publication Number:
  US 20060059407A1
• Time in Patent Office: Days
• US Class Current: 714/764
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Abstract

To provide a system capable of preventing UE from receiving the same data (duplicate data) as data already received and to provide each of devices used for this system. A terminal device receives update timing information indicating timing when data (e.g., data of an MBMS service) is updated and transmitted, stops, based on the update timing information, a receiving process till the updated data is transmitted, and resumes the receiving process in synchronization with the timing of transmitting the updated data.

Claims

1. A network system comprising:

a data transmitting device including a data transmitting unit multicasting data to an unspecified or specified terminal device, and update timing information transmitting unit multicasting, to the unspecified or specified terminal device, update timing information defined as information that indicates timing when the data transmitting unit transmits the data updated; and

a terminal device including a data receiving unit receiving the data from the data transmitting device, an update timing information receiving unit receiving the update timing information from the data transmitting device, a judging unit judging the receipt timing when the data receiving unit should receive the data next, based on the update timing information, and a receipt instructing unit instructing the data receiving unit to stop and/or start the receipt of the data in accordance with a result of the judgment made by the judging unit.

2. A network system comprising:

a data transmitting device including a data transmitting unit multicasting data to an unspecified or specified terminal device, a control signal transmitting unit multicasting to the unspecified or specified terminal device a control signal necessary for the terminal device to receive the data transmitted from the data transmitting unit, and an adding unit adding, to the control signal, update timing information defined as information that indicates timing when the data transmitting unit transmits the data updated; and

a terminal device including a data receiving unit receiving the data from the data transmitting device, a control signal receiving unit receiving the control signal from the data transmitting device, a judging unit judging a receipt timing when the data receiving unit should receive the data next, based on the update timing information contained in the received control signal, and a receipt instructing unit instructing the control signal receiving unit and the data receiving unit to stop and/or start the receipt in accordance with a result of the judgment made by the judging unit.

3. A network system according to claim 2, wherein the receipt instructing unit instructs the data receiving unit and the control signal receiving unit to stop the receipt till the receipt timing, and instructs the data receiving unit and the control signal receiving unit to start the receipt at the receipt timing, and

the data receiving unit receives the data on the basis of the control signal received by the control signal receiving unit.

4. A data transmitting device comprising:

a data transmitting unit multicasting data to an unspecified or specified terminal device; and

an update timing information transmitting unit multicasting, to the unspecified or specified terminal device, update timing information defined as information that indicates timing when the data transmitting unit transmits the data updated.

5. A terminal device comprising:

a data receiving unit receiving a data from a data transmitting device;

an update timing information receiving unit receiving update timing information defined as information that indicates timing when the data updated is transmitted from the data transmitting device;

a judging unit judging the receipt timing when the data receiving unit should receive the data next, based on the update timing information; and

a receipt instructing unit instructing the data receiving unit to stop and/or start the receipt of the data in accordance with a result of the judgment made by the judging unit.

6. A data transmitting device comprising:

a data transmitting unit multicasting data to an unspecified or specified terminal device;

a control signal transmitting unit multicasting to the unspecified or specified terminal device a control signal necessary for the terminal device to receive the data transmitted by the data transmitting unit; and

an adding unit adding, to the control signal, update timing information defined as information that indicates timing when the data transmitting unit transmits the data updated.

7. A terminal device comprising:

a data receiving unit receiving the data from a data transmitting device;

a control signal receiving unit receiving a control signal required for the data receiving unit to receive the data transmitted from the data transmitting device;

a judging unit judging a receipt timing when the data receiving unit should receive the data next, based on update timing information contained in the received control signal and indicating timing when the data transmitting device transmits the data updated; and

a receipt instructing unit instructing the control signal receiving unit and the data receiving unit to stop and/or start the receipt in accordance with a result of the judgment made by the judging unit.

8. A multicasting method comprising:

at a first device, multicasting data to an unspecified or specified second device;

at the first device, multicasting, to the unspecified or specified second device, update timing information defined as information that indicates timing of transmitting data updated;

at the second device, receiving the data from the first device;

at the second device, receiving the update timing information from the first device;

at the second device, judging a receipt timing when the second device should receive the data next, based on the update timing information; and

at the second device, giving an instruction to stop and/or start receiving the data in accordance with a result of the judgment.

9. A multicasting method comprising:

at a first device, multicasting data to an unspecified or specified second device;

at the first device, multicasting, to the second device, a control signal required for the second device to receive the transmitted data;

at the first device, adding, to the control signal, update timing information defined as information that indicates timing of transmitting data updated

at the second device, receiving the data from the first device;

at the second device, receiving the control signal from the first device;

at the second device, judging a receipt timing on the basis of the update timing information contained in the received control signal; and

at the second device, giving an instruction to stop and/or start receiving the data and the control signal in accordance with a result of the judgment.