Wireless communication system and method of making wireless communication

1. A wireless communication system including a radio-signal base station, and at least one mobile wireless terminal which operates in a power-saving mode in which said mobile wireless terminal intermittently receives packet signals, and in a normal mode in which said mobile wireless terminal regularly receives packet signals,

wherein when said radio-signal base station receives packet signals addressed to a mobile wireless terminal being in said power-saving mode, said radio-signal base station temporarily stores the received packet signals until said mobile wireless terminal requests said radio-signal base station to transmit said packet signals thereto, and

said mobile wireless terminal requests said radio-signal base station to transmit said packet signals thereto and transfers to said normal mode from said power-saving mode, if said mobile wireless terminal judges that the received packet signals are packet signals to be received in real-time communication, said mobile wireless terminal receives entirety of said packet signals in said normal mode, and said mobile wireless terminal transfers to said power-saving mode when said packet signals have been all received in real-time communication, and

wherein if said mobile wireless terminal judges that it would not be necessary to carry out real-time communication for receiving entirety of said packet signals, said mobile wireless terminal intermittently receives said packet signals at a certain interval in said power-saving mode.

2. The wireless communication system as set forth in claim 1 , wherein if said mobile wireless terminal judges that the received packet signals are packet signal not necessary to be received in real-time communication, said mobile wireless terminal transfers to said power-saving mode from said normal mode.

3. The wireless communication system as set forth in claim 1 , wherein said mobile wireless terminal transfers to said power-saving mode when entirety of said packet signals has been received.

4. The wireless communication system as set forth in claim 1 , wherein said radio-signal base station periodically transmits an informative signal to said mobile wireless terminal being in said power-saving mode, and said mobile wireless terminal is aware that packet signals addressed to said mobile wireless terminal are stored in said radio-signal base station, by analyzing the received informative signal.

5. The wireless communication system as set forth in claim 4 , wherein said mobile wireless terminal receives said informative signal in said power-saving mode at an interval determined by itself.

6. The wireless communication system as set forth in claim 4 , wherein said mobile wireless terminal receives said packet signals at an interval at which said mobile wireless terminal receives said informative signal from said radio-signal base station.

7. The wireless communication system as set forth in claim 4 , wherein said mobile wireless terminal receives said packet signals at an interval equal to N×I, wherein said I indicates an interval at which said mobile wireless terminal receives said informative signal from said radio-signal base station, and said N is a positive integer equal to or greater than two (2).

8. The wireless communication system as set forth in claim 1 , wherein said mobile wireless terminal sets a longer interval at which said mobile wireless terminal receives said packet signals, for a smaller frequency at which said packet signals are transmitted from said radio-signal base station.

9. The wireless communication system as set forth in claim 1 , wherein said mobile wireless terminal sets a longer interval at which said mobile wireless terminal receives said packet signals, if said mobile wireless terminal cannot receive said informative signal from said radio-signal base station.

10. The wireless communication system as set forth in claim 1 , wherein said mobile wireless terminal checks whether the received packet signals include data indicative of commencement of real-time communication, and if the received packet signals include such data, said mobile wireless terminal judges said packet signal to be received in real-time communication.

11. The wireless communication system as set forth in claim 1 , wherein said mobile wireless terminal checks whether the received packet signals include real-time transmission protocol, and if the received packet signals include said real-time transmission protocol, said mobile wireless terminal judges said packet signal to be received in real-time communication.

12. The wireless communication system as set forth in claim 1 , wherein said mobile wireless terminal is comprised of a cellular phone.

13. The wireless communication system as set forth in claim 1 , wherein said radio-signal base station includes functions of:

transmitting packet signals for real-time communication to a communication network after certain protocol communication;

memorizing a mobile wireless terminal(s) which is(are) in said power-saving mode, among a plurality of mobile wireless terminals;

periodically transmitting an informative signal to said mobile wireless terminal which is in said power-saving mode;

temporarily storing packet signals addressed to said mobile wireless terminal which is in said power-saving mode;

when said radio-signal base station stores packet signals addressed to said mobile wireless terminal which is in said power-saving mode, combining information indicating so to said informative signal; and

on receipt of a request from said mobile wireless terminal to transmit said packet signals stored therein, to said mobile wireless terminal, transmitting said packet signals intermittently to a mobile wireless terminal which is in said power-saving mode, but regularly to said mobile wireless terminal, if said mobile wireless terminal is transferred to said normal mode.

14. The wireless communication system as set forth in claim 1 , wherein said mobile wireless terminal includes functions of:

when said mobile wireless terminal transfers to said power-saving mode from said normal mode, informing said radio-signal base station of such mode-transfer;

determining an interval at which said mobile wireless terminal receives signals, said interval being equal to N×I wherein N is a positive integer equal to or greater than two (2), and I indicates an interval at which said radio-signal base station transmits said announce signal;

receiving said informative signal from said radio-signal base station at said interval when said mobile wireless terminal is in said power-saving mode;

if the received informative signal includes information indicating that said radio-signal base station stores packet signals addressed to said mobile wireless terminal, requesting said radio-signal base station to transmit said packet signals to said mobile wireless terminal;

judging whether said packet signals are necessary to be received in real-time communication, based on a protocol of the received packet signals;

requesting said radio-signal base station to transmit all of said packet signals to said mobile wireless terminal, and transferring to said normal mode from said power-saving mode;

transferring to said power-saving mode from said normal mode when said packet signals have been all transmitted to said mobile wireless terminal.

15. A method of making wireless communication system between a radio-signal base station and at least one mobile wireless terminal which operates in a power-saving mode in which said mobile wireless terminal intermittently receives packet signals, and in a normal mode in which said mobile wireless terminal regularly receives packet signals,

said method including the steps of:

(a) receiving packet signals addressed to a mobile wireless terminal being in said power-saving mode;

(b) temporarily storing the received packet signals until said mobile wireless terminal requests said radio-signal base station to transmit said packet signals thereto;

(c) requesting said radio-signal base station to transmit said packet signals thereto;

(d) transferring to said normal mode from said power-saving mode;

(e) if said mobile wireless terminal judges that the received packet signals are packet signals to be received in real-time communication, receiving entirety of said packet signals in said normal mode; and

(f) transferring to said power-saving mode when said packet signals have been all received in real-time communication,

(g) if said mobile wireless terminal judges that it would not be necessary to carry out real-time communication for receiving entirety of said packet signals, intermittently receiving said packet signals at a certain interval in said power-saving mode, the step being carried out by said mobile wireless terminal

said steps (a) and (b) being carried out by said radio-signal base station, and said steps (c) to (g) being carried out by said mobile wireless terminal.

16. The method as set forth in claim 15 , further comprising the step of, if said mobile wireless terminal judges that the received packet signals are packet signal not necessary to be received in real-time communication, transferring to said power-saving mode from said normal mode, said step being carried out by said mobile wireless terminal.

17. The method as set forth in claim 15 , further comprising the step of transferring to said power-saving mode when entirety of said packet signals has been received, the step being carried out by said mobile wireless terminal.

18. The method as set forth in claim 15 , further comprising the step of periodically transmitting an informative signal to said mobile wireless terminal being in said power-saving mode such that said mobile wireless terminal is aware that packet signals addressed to said mobile wireless terminal are stored in said radio-signal base station, by analyzing the received informative signal, the step being carried out by said radio-signal base station.

19. The method as set forth in claim 18 , further comprising the step of receiving said informative signal in said power-saving mode at an interval determined by itself, the step being carried out by said mobile wireless terminal.

20. The method as set forth in claim 18 , further comprising the step of receiving said packet signals at an interval at which said mobile wireless terminal receives said informative signal from said radio-signal base station, the step being carried out by said mobile wireless terminal.

21. The method as set forth in claim 18 , further comprising the step of receiving said packet signals at an interval equal to N×I, wherein said I indicates an interval at which said mobile wireless terminal receives said informative signal from said radio-signal base station, and said N is a positive integer equal to or greater than two (2), the step being carried out by said mobile wireless terminal.

22. The method as set forth in claim 15 , further comprising the step of setting a longer interval at which said mobile wireless terminal receives said packet signals, for a smaller frequency at which said packet signals are transmitted from said radio-signal base station, the step being carried out by said mobile wireless terminal.

23. The method as set forth in claim 15 , further comprising the step of setting a longer interval at which said mobile wireless terminal receives said packet signals, if said mobile wireless terminal cannot receive said informative signal from said radio-signal base station, the step being carried out by said mobile wireless terminal.

24. The method as set forth in claim 15 , further comprising the steps of checking whether the received packet signals include data indicative of commencement of real-time communication, and, if the received packet signals include such data, judging said packet signal to be received in real-time communication, the steps being carried out by said mobile wireless terminal.

25. The method as set forth in claim 15 , further comprising the steps of checking whether the received packet signals include real-time transmission protocol, and, if the received packet signals include said real-time transmission protocol, judging said packet signal to be received in real-time communication, the step being carried out by said mobile wireless terminal.

26. A mobile wireless terminal used in combination with a radio-signal base station in a wireless communication system, said radio-signal base station, when said radio-signal base station receives packet signals addressed to a mobile wireless terminal being in a power-saving mode, temporarily storing the received packet signals until said mobile wireless terminal requests said radio-signal base station to transmit said packet signals thereto,

wherein said mobile wireless terminal operates in a power-saving mode in which said mobile wireless terminal intermittently receives packet signals, and in a normal mode in which said mobile wireless terminal regularly receives packet signals, and

said mobile wireless terminal requests said radio-signal base station to transmit said packet signals thereto and transfers to said normal mode from said power-saving mode, if said mobile wireless terminal judges that the received packet signals are packet signals to be received in real-time communication, receives entirety of said packet signals in said normal mode, and transfers to said power-saving mode when said packet signals have been all received in real-time communication, and

wherein if said mobile wireless terminal judges that it would not be necessary to carry out real-time communication for receiving entirety of said packet signals, said mobile wireless terminal intermittently receives said packet signals at a certain interval in said power-saving mode.

27. The mobile wireless terminal as set forth in claim 26 , wherein if said mobile wireless terminal judges that the received packet signals are packet signals not necessary to be received in real-time communication, said mobile wireless terminal transfers to said power-saving mode from said normal mode.

28. The mobile wireless terminal as set forth in claim 26 , wherein said mobile wireless terminal transfers to said power-saving mode when entirety of said packet signals has been received.

29. The mobile wireless terminal as set forth in claim 26 , wherein said mobile wireless terminal is aware that packet signals addressed to said mobile wireless terminal are stored in said radio-signal base station, by analyzing a informative signal periodically transmitted from said radio-signal base station.

30. The mobile wireless terminal as set forth in claim 29 , wherein said mobile wireless terminal receives said informative signal in said power-saving mode at an interval determined by itself.

31. The mobile wireless terminal as set forth in claim 29 , wherein said mobile wireless terminal receives said packet signals at an interval at which said mobile wireless terminal receives said informative signal from said radio-signal base station.

32. The mobile wireless terminal as set forth in claim 29 , wherein said mobile wireless terminal receives said packet signals at an interval equal to N×I, wherein said I indicates an interval at which said mobile wireless terminal receives said informative signal from said radio-signal base station, and said N is a positive integer equal to or greater than two (2).

33. The mobile wireless terminal as set forth in claim 26 , wherein said mobile wireless terminal sets a longer interval at which said mobile wireless terminal receives said packet signals, for a smaller frequency at which said packet signals are transmitted from said radio-signal base station.

34. The mobile wireless terminal as set forth in claim 26 , wherein said mobile wireless terminal sets a longer interval at which said mobile wireless terminal receives said packet signals, if said mobile wireless terminal cannot receive said informative signal from said radio-signal base station.

35. The mobile wireless terminal as set forth in claim 26 , wherein said mobile wireless terminal checks whether the received packet signals include data indicative of commencement of real-time communication, and if the received packet signals include such data, said mobile wireless terminal judges said packet signal to be received in real-time communication.

36. The mobile wireless terminal as set forth in claim 26 , wherein said mobile wireless terminal checks whether the received packet signals include real-time transmission protocol, and if the received packet signals include said real-time transmission protocol, said mobile wireless terminal judges said packet signal to be received in real-time communication.

37. The mobile wireless terminal as set forth in claim 26 , wherein said mobile wireless terminal is comprised of a cellular phone.

38. The mobile wireless terminal as set forth in claim 26 , wherein said mobile wireless terminal includes functions of:

when said mobile wireless terminal transfers to said power-saving mode from said normal mode, informing said radio-signal base station of such mode-transfer;

determining an interval at which said mobile wireless terminal receives signals, said interval being equal to N×I wherein N is a positive integer equal to or greater than two (2), and I indicates an interval at which said radio-signal base station transmits said announce signal;

receiving said informative signal from said radio-signal base station at said interval when said mobile wireless terminal is in said power-saving mode;

if the received informative signal includes information indicating that said radio-signal base station stores packet signals addressed to said mobile wireless terminal, requesting said radio-signal base station to transmit said packet signals to said mobile wireless terminal;

judging whether said packet signals are necessary to be received in real-time communication, based on a protocol of the received packet signals;

requesting said radio-signal base station to transmit all of said packet signals to said mobile wireless terminal, and transferring to said normal mode from said power-saving mode;

transferring to said power-saving mode from said normal mode when said packet signals have been all transmitted to said mobile wireless terminal.