Mobile communication device, mobile data communication method, and recording medium

• US 6,507,566 B1
• Filed: 08/10/1998
• Issued: 01/14/2003
• Est. Priority Date: 12/10/1996
• Status: Expired due to Fees

• Current Assignee: NTT Mobile Communications Network Inc. (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Okajima, Ichiro, Noda, Chie, Hattori, Hiroyuki, Takami, Tadao
• Primary Examiner(s): NGUYEN, STEVEN H D
• Application Number:
  US09/117,910
• Time in Patent Office: 1,618 Days
• Field of Search: 370/351-356, 370/311, 370/328, 370/338, 370/400, 370/401-402, 370/474, 370/466, 370/469, 370/468, 370/503, 370/505, 370/506, 370/511, 370/513, 340/7.32, 455/557, 455/556, 455/522, 455/574, 375/340, 375/354, 375/365, 375/366, 375/368, 375/369, 375/370, 358/425, 358/426.01, 358/426.1, 358/438, 358/435
• US Class Current: 370/310
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365

Abstract

In a mobile communication system, the PAD of the data-processing-terminal-interface has a packet assembling/disassembling function for the protocol for data-link layer A and the protocol for data-link layer B. The protocol for data-link layer A of the data processing terminal prescribes that a frame, in which data transferred from the upper layer is inserted between flag sequences with a prescribed bit pattern, be transmitted usually, and that flag sequences without data transmission be transmitted when there is no data requiring transmission during communication. If flag sequences are transferred from the data processing terminal, the PAD deletes a part or all of the flag sequences and does not transfer them to the wireless communication unit. Consequently, a part or all of the flag sequences are not transmitted to the wireless communication channel. Therefore, power consumption by a wireless mobile station device or the like may be reduced, and the wireless channel may effectively used.

Claims

1. A method for mobile data communication between a sender side and a receiver side, the method comprising:

generating a series of transmissions on the sender side, wherein there is at least one flag between at least two adjacent series of transmissions, wherein the at least one flag notifies the receiver side of a beginning or end of a transmission and of a continuous establishment of a communication link;

determining on the sender side an elapsed time during which at least one transmission is transmitted without data after a last transmission with data is transmitted; and

eliminating on the sender side transmissions that are transmitted without data after the elapsed time until a transmission with data is transmitted.

2. The method of claim 1 wherein the elapsed time is measured by a number of transmissions that are transmitted without data.

3. The method of claim 2 wherein the number of transmissions that is used to measure the elapsed time is two.

4. The method of claim 1 wherein for a certain period of time after receiving the last transmission from the sender side, the receiver side generates at intervals a transmission without data that is accompanied by the flag.

5. A system for mobile data communication between a sender side and a receiver side, the sender side comprising:

a transmitter configured to generate a series of transmissions, wherein there is at least one flag between at least two adjacent series of transmissions, wherein the at least one flag notifies the receiver side of a beginning or end of a transmission and of a continuous establishment of a communication link; and

a data processing unit configured to determine an elapsed time during which at least one transmission is transmitted without data after a last transmission with data is transmitted and eliminate transmissions that are transmitted without data after the elapsed time until a first transmission with data is transmitted.

6. The system of claim 5, wherein for a certain period of time after receiving the last transmission from the sender side, the receiver side is configured to generate at intervals a transmission without data that is accompanied by the flag.

7. The system of claim 5, wherein the sender side further comprises a data processing terminal and the data processing unit is located in the data processing terminal.

8. The system of claim 7 wherein the data processing terminal further comprises communication protocol layers and the data communication unit is located between a data-link layer and a physical layer.

9. The system of claim 5 wherein the sender side further comprises a data processing terminal interface and the data processing unit is located in the interface.

10. The system of claim 9 wherein the data processing terminal interface further comprises communication protocol layers and the data processing unit is located between a physical layer and a data-link layer.

11. The system of claim 10 wherein the data processing terminal interface further comprises a packet assembler/disassembler and the data processing unit is located in the packet assembler/disassembler.

12. The system of claim 7 wherein the data processing terminal interfaces further comprises communication protocol layers and the data processing unit is located above a physical layer.

13. The system of claim 5 wherein the sender side further comprises a wireless communication unit and the data processing unit is located in the wireless communication unit.

14. The system of claim 13 wherein the wireless communication unit further comprises communication protocol layers and the data processing unit is located in between a network layer and data-link layers.

15. The system of claim 13 wherein the sender side further comprises a data processing terminal in communication with the wireless communication unit.

16. The system of claim 15 wherein the data processing terminal further comprises communication protocol layers from the group comprising an application layer, a data-link layer and a physical layer.

17. The system of claim 7 wherein the sender side further comprises a wireless communication unit in communication with the data processing terminal.

18. The system of claim 17 wherein the data processing terminal further comprises communication protocol layers and the data processing unit is located in between a data-link layer and a physical layer.

19. A system for mobile data communication, the system comprising:

a data processing terminal;

said data processing terminal operatively connected to a data processing terminal interface;

the data processing terminal interface operatively connected to a wireless communication unit;

wherein at least one of the data processing terminal, the data processing terminal interface and the wireless communication unit is configured to generate a series of transmissions, wherein there is at least one flag between at least two adjacent series of transmissions, wherein the at least one flag notifies the receiver side of a beginning or end of a transmission and of a continuous establishment of a communication link;

wherein at least one of the data processing terminal, the data processing terminal interface and the wireless communication unit is configured to determine an elapsed time during which at least one transmission is transmitted without data after a last transmission with data is transmitted; and

wherein at least one of the data processing terminal, the data processing terminal interface and the wireless communication unit is configured to eliminate transmissions that are transmitted without data after the elapsed time until a first transmission with data is transmitted.

20. A mobile communication device, the device comprising:

a transmitter configured to generate a series of transmissions, wherein there is at least one flag between at least two adjacent series of transmissions, wherein the at least one flag notifies the receiver side of a beginning or end of a transmission and of a continuous establishment of a communication link; and

a data processing unit configured to determine an elapsed time during which at least one transmission is transmitted without data after a last transmission with data is transmitted and eliminate transmissions that are transmitted without data after the elapsed time until a first transmission with data is transmitted.