Radio Communication System, Transmission Apparatus, Transmission Method, Program and Recording Medium

• US 20090002235A1
• Filed: 02/16/2006
• Published: 01/01/2009
• Est. Priority Date: 03/14/2005
• Status: Abandoned Application

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ito, Takumi
• Application Number:
  US11/816,876
• Publication Number:
  US 20090002235A1
• Time in Patent Office: Days
• US Class Current: 342/368
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04W 16/28 using beam steering

Abstract

Although the beam forming is quite a good scheme, if there exist particularly a plurality of users, the characteristic deterioration occurs in an associated communication line due to the tight radio resource on the reverse line and delay in the transmission time caused by the feedback of information exceeding the required information. The transmitter 1 in a radio communication system receives signals by the antennas 13-1 to 13-M and the duplexers 14-1 to 14-M, extracts user'"'"'s profile information by the transmission signal controller 12, determines in a unified manner a radio resource amount and its assignment as well as the application or non-application of the beam forming, generates by the transmission signal generator 11 transmission signals using user'"'"'s transmission data according to the resource distribution and the application or non-application of the beam forming thus determined, and transmits the signals by use of the duplexers 14-1 to 14-M and the antennas 13-1 to 13-M.

Claims

1. A radio communication system, characterized in that

a transmitter comprising M antennas (M is an integer equal to or more than two) to transmit signals to a receiver, comprising:

transmission signal control means for receiving as inputs thereto profile information items of N users (N is an integer equal to or more than two);

determining, by use of the profile information items, a radio resource amount to be distributed to each of the N users and assignment thereof as well as application or non-application of beam forming; and

creating and outputting radio resource control signals indicating the radio resource amount to be distributed and the assignment thereof and transmission mode control signals indicating a result of the application or non-application; and

transmission signal creating means for receiving as inputs thereto transmission data items of the N users, the radio resource control signals, and the transmission mode control signals;

allocating radio resources to N1 users (N1 is an integer equal to or more than one and equal to less than N) to which radio resources are allocated on the basis of the radio resource control signals, creating the transmission signals using the transmission data items by applying the beam forming for N2 users (N2 is an integer equal to or more than zero and equal to less than N1) for whom the transmission mode control signals indicate the application, creating the transmission signals using the transmission data items without applying the beam forming for N3 users (N3 is an integer equal to or more than zero and equal to less than N1 and N2+N3=N1) for whom the transmission mode control signals indicate the non-application, and outputting the transmission signals thus created.

2. The radio communication system in accordance with claim 1, wherein

the transmission signal control means determines, by use of the profile information items, a radio resource amount to be distributed to each of the N users, creates radio resource amount control signals, determines application or non-application of beam forming for the N1 users on the basis of the profile information items and the radio resource amount control signals, creates the transmission mode control signals, determines assignment of a radio resource to be distributed to each of the N users by use of the radio resource amount control signals and the transmission mode control signals, and thereby produces the radio resource control signals.

3. The radio communication system in accordance with claim 1, wherein

the transmission signal control means provisionally determines, by use of the profile information items, application or non-application of beam forming for each of the N users;

generates provisional transmission mode control signals, determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof as well as application or non-application of beam forming to the N1 users, and generates the radio resource control signals and the transmission mode control signals.

4. The radio communication system in accordance with claim 3, wherein

the transmission signal control means determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof;

generates radio resource control signals, receives as inputs thereto the profile information items and the radio resource control signals, determines application or non-application of beam forming for the N1 users, and generates the transmission mode control signals.

5. The radio communication system in accordance with claim 3, wherein

the transmission signal control means determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof;

generates radio resource control signals, receives as inputs thereto the radio resource control signals and the provisional transmission mode control signals; and

generates the provisional transmission mode control signals for the N1 users, as the transmission mode control signals.

6. The radio communication system in accordance with claim 1, wherein

the transmission signal control means determines assignment of radio resources such that signal transmission points of time of the N2 users are earlier than signal transmission points of time of the N3 users and generates radio resource control signals.

7. The radio communication system in accordance with claim 2, wherein

the transmission signal control means estimates, in the determination of the application or non-application of the beam forming for the N1 users, first reception quality when the beam forming is not applied, by using the profile information items;

determines the non-application of the beam forming if the first reception quality exceeds a predetermined value;

estimates, if the first reception quality does not exceed the predetermined value, second reception quality when the beam forming is applied;

determines the application of the beam forming if the second reception quality exceeds the first reception quality, determines the non-application of the beam forming if the second reception quality does not exceed the first reception quality, and generates the transmission mode control signals.

8. The radio communication system in accordance with claim 2, wherein

the transmission signal control means conducts, in the determination of the application or non-application of the beam forming for the N1 users by using the profile information items and the radio resource amount control signals, the determination through primary determination and secondary determination;

carries out the primary determination using the first profile information items attained by when the second determination is started, determines the application or non-application of the beam forming by accomplishing the secondary determination by use of second profile information items requiring only the primary determination users determined in the primary determination to conduct the feedback or by use of only the second profile or both of the first and second profiles; and

thereby generating the transmission mode control signals.

9. The radio communication system in accordance with claim 8, characterized in that

the transmission signal control means determines, as the primary determination users, users having K elements (K is an integer equal to or more than one) included in the first profile information items, the K elements including K1 elements (K1 is an integer equal to or more than one and equal to or less than k) exceeding a predetermined reference value.

10. The radio communication system in accordance with claim 8, characterized in that

the transmission signal control means determines, as the primary determination users, users having K elements included in the first profile information items, the K elements including K2 elements (K2 is an integer equal to or more than one and equal to or less than k) all of which exceeding a predetermined reference value.

11. The radio communication system in accordance with claim 8, characterized in that

the transmission signal control means adopts, as the first profile information, a radio resource amount necessary for the feedback of the second profile information.

12. The radio communication system in accordance with claim 8, characterized in that

the transmission signal control means determines priority levels of the primary determination users by use of L1 elements selected from L elements included in the second profile information (L is an integer equal to or more than one;

L1 is an integer equal to or more than one and equal to or less than L) and determines, as the secondary determination, users having a priority level exceeding a predetermined priority level.

13. The radio communication system in accordance with claim 3, wherein

the transmission signal control means estimates, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, first reception quality when the beam forming is not applied;

provisionally determines the non-application of beam forming if the first reception quality exceeds a predetermined value;

estimates, if the first reception quality does not exceed the predetermined value, second reception quality when the beam forming is applied;

provisionally determines the application of beam forming if the second reception quality exceeds the first reception quality;

provisionally determines the non-application of beam forming if the second reception quality does not exceed the first reception quality; and

thereby produces the provisional transmission mode control signals.

14. The radio communication system in accordance with claim 3, wherein

the transmission signal control means provisionally determines, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, the application of beam forming for users whose P elements (P is an integer equal to or more than one) included in the profile information items include P1 elements (P is an integer equal to or more than one and equal to or less than P) exceeding a predetermined reference value;

provisionally determines the non-application for the other users, and thereby produces the provisional transmission mode control signals.

15. The radio communication system in accordance with claim 3, wherein

the transmission signal control means provisionally determines, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, the application of beam forming for users whose P elements (P is an integer equal to or more than one) included in the profile information items include a predetermined number P2 elements (P2 is an integer equal to or more than one and equal to or less than P) all of which exceeding a reference value;

provisionally determines the non-application of beam forming for the other users, and thereby produces the provisional transmission mode control signals.

16. A transmitter comprising M antennas (M is an integer equal to or more than two) to transmit signals to a receiver, characterized by comprising:

transmission signal control means for receiving as inputs thereto profile information items of N users (N is an integer equal to or more than two);

determining, by use of the profile information items, a radio resource amount to be distributed to each of the N users and assignment thereof as well as application or non-application of beam forming; and

creating and outputting radio resource control signals indicating the radio resource amount to be distributed and the assignment thereof and transmission mode control signals indicating a result of the application or non-application; and

transmission signal creating means for receiving as inputs thereto transmission data items of the N users, the radio resource control signals, and the transmission mode control signals;

allocating radio resources to N1 users (N1 is an integer equal to or more than one and equal to less than N) to which radio resources are allocated on the basis of the radio resource control signals, creating the transmission signals using the transmission data items by applying the beam forming for N2 users (N2 is an integer equal to or more than zero and equal to less than N1) for whom the transmission mode control signals indicate the application, creating the transmission signals using the transmission data items without applying the beam forming for N3 users (N3 is an integer equal to or more than zero and equal to less than N1 and N2+N3=N1) for whom the transmission mode control signals indicate the non-application, and outputting the transmission signals thus created.

17. The transmitter in accordance with claim 16, wherein

the transmission signal control means determines, by use of the profile information items, a radio resource amount to be distributed to each of the N users, creates radio resource amount control signals, determines application or non-application of beam forming for the N1 on the basis of the profile information items and the radio resource amount control signals, creates the transmission mode control signals, determines assignment of a radio resource to be distributed to each of the N users by use of the radio resource amount control signals and the transmission mode control signals, and thereby produces the radio resource control signals.

18. The transmitter in accordance with claim 16, wherein

the transmission signal control means provisionally determines, by use of the profile information items, application or non-application of beam forming for each of the N users;

generates provisional transmission mode control signals, determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof as well as application or non-application of beam forming to the N1 users, and generates the radio resource control signals and the transmission mode control signals.

19. The transmitter in accordance with claim 18, wherein

the transmission signal control means determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof, generates radio resource control signals, receives as inputs thereto the profile information items and the radio resource control signals, determines application or non-application of beam forming for the N1 users, and generates the transmission mode control signals.

20. The transmitter in accordance with claim 18, wherein

the transmission signal control means determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof;

generates radio resource control signals, receives as inputs thereto the radio resource control signals and the provisional transmission mode control signals; and

generates the provisional transmission mode control signals for the N1 users, as the transmission mode control signals.

21. The transmitter in accordance with claim 16, wherein

the transmission signal control means determines assignment of radio resources such that signal transmission points of time of the N2 users are earlier than signal transmission points of time of the N3 users and generates radio resource control signals.

22. The transmitter in accordance with claim 17, wherein

the transmission signal control means estimates, in the determination of the application or non-application of the beam forming for the N1 users, first reception quality when the beam forming is not applied, by using the profile information items;

determines the non-application of the beam forming if the first reception quality exceeds a predetermined value;

estimates, if the first reception quality does not exceed the predetermined value, second reception quality when the beam forming is applied;

determines the application of the beam forming if the second reception quality exceeds the first reception quality, determines the non-application of the beam forming if the second reception quality does not exceed the first reception quality, and generates the transmission mode control signals.

23. The transmitter in accordance with claim 17, wherein

the transmission signal control means conducts, in the determination of the application or non-application of the beam forming for the N1 users by using the profile information items and the radio resource amount control signals, the determination through primary determination and secondary determination;

carries out the primary determination using the first profile information items attained by when the second determination is started, determines the application or non-application of the beam forming by accomplishing the secondary determination by use of second profile information items requiring only the primary determination users determined in the primary determination to conduct the feedback or by use of only the second profile or both of the first and second profiles; and

thereby generating the transmission mode control signals.

24. The transmitter in accordance with claim 23, characterized in that

the transmission signal control means determines, as the primary determination users, users having K elements (K is an integer equal to or more than one) included in the first profile information items, the K elements including K1 elements (K1 is an integer equal to or more than one and equal to or less than k) exceeding a predetermined reference value.

25. The transmitter in accordance with claim 23, characterized in that

the transmission signal control means determines, as the primary determination users, users having K elements included in the first profile information items, the K elements including K2 elements (K2 is an integer equal to or more than one and equal to or less than k) all of which exceeding a predetermined reference value.

26. The transmitter in accordance with claim 23, characterized in that

the transmission signal control means adopts, as the first profile information, a radio resource amount necessary for the feedback of the second profile information.

27. The transmitter in accordance with claim 23, characterized in that

the transmission signal control means determines priority levels of the primary determination users by use of L1 elements selected from L elements included in the second profile information (L is an integer equal to or more than one;

L1 is an integer equal to or more than one and equal to or less than L) and determines, as the secondary determination, users having a priority level exceeding a predetermined priority level.

28. The transmitter in accordance with claim 18, wherein

the transmission signal control means estimates, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, first reception quality when the beam forming is not applied;

provisionally determines the non-application of beam forming if the first reception quality exceeds a predetermined value;

estimates, if the first reception quality does not exceed the predetermined value, second reception quality when the beam forming is applied;

provisionally determines the application of beam forming if the second reception quality exceeds the first reception quality;

provisionally determines the non-application of beam forming if the second reception quality does not exceed the first reception quality; and

thereby produces the provisional transmission mode control signals.

29. The transmitter in accordance with claim 18, wherein

the transmission signal control means provisionally determines, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, the application of beam forming for users whose P elements (P is an integer equal to or more than one) included in the profile information items include P1 elements (P is an integer equal to or more than one and equal to or less than P) exceeding a predetermined reference value;

provisionally determines the non-application for the other users, and thereby produces the provisional transmission mode control signals.

30. The transmitter in accordance with claim 18, wherein

the transmission signal control means provisionally determines, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, the application of beam forming for users whose P elements (P is an integer equal to or more than one) included in the profile information items include a predetermined number P2 elements (P2 is an integer equal to or more than one and equal to or less than P) all of which exceeding a reference value;

provisionally determines the non-application of beam forming for the other users, and thereby produces the provisional transmission mode control signals.

31. A transmission method for a transmitter comprising M antennas (M is an integer equal to or more than two) to transmit signals to a receiver, characterized by comprising:

a transmission signal control step of receiving as inputs thereto profile information items of N users (N is an integer equal to or more than two);

determining, by use of the profile information items, a radio resource amount to be distributed to each of the N users and assignment thereof as well as application or non-application of beam forming; and

creating and outputting radio resource control signals indicating the radio resource amount to be distributed and the assignment thereof and transmission mode control signals indicating a result of the application or non-application; and

a transmission signal creating step of receiving as inputs thereto transmission data items of the N users, the radio resource control signals, and the transmission mode control signals;

allocating radio resources to N1 users (N1 is an integer equal to or more than one and equal to less than N) to which radio resources are allocated on the basis of the radio resource control signals, creating the transmission signals using the transmission data items by applying the beam forming for N2 users (N2 is an integer equal to or more than zero and equal to less than N1) for whom the transmission mode control signals indicate the application, creating the transmission signals using the transmission data items without applying the beam forming for N3 users (N3 is an integer equal to or more than zero and equal to less than N1 and N2+N3=N1) for whom the transmission mode control signals indicate the non-application, and outputting the transmission signals thus created.

32. The transmission method in accordance with claim 31, wherein

the transmission signal control step determines, by use of the profile information items, a radio resource amount to be distributed to each of the N users, creates radio resource amount control signals, determines application or non-application of beam forming for the N1 users on the basis of the profile information items and the radio resource amount control signals, creates the transmission mode control signals, determines assignment of a radio resource to be distributed to each of the N users by use of the radio resource amount control signals and the transmission mode control signals, and thereby produces the radio resource control signals.

33. The transmission method in accordance with claim 31, wherein

the transmission signal control step provisionally determines, by use of the profile information items, application or non-application of beam forming for each of the N users;

generates provisional transmission mode control signals, determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof as well as application or non-application of beam forming to the N1 users, and generates the radio resource control signals and the transmission mode control signals.

34. The transmission method in accordance with claim 33, wherein

the transmission signal control step determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof;

generates radio resource control signals, receives as inputs thereto the profile information items and the radio resource control signals, determines application or non-application of beam forming for the N1 users, and generates the transmission mode control signals.

35. The transmission method in accordance with claim 33, wherein

the transmission signal control step determines, by use of the profile information items and the provisional transmission mode control signals, a radio resource amount to be distributed to each of the N users and assignment thereof;

generates radio resource control signals, receives as inputs thereto the radio resource control signals and the provisional transmission mode control signals; and

generates the provisional transmission mode control signals for the N1 users, as the transmission mode control signals.

36. The transmission method in accordance with claim 31, wherein

the transmission signal control step determines assignment of radio resources such that signal transmission points of time of the N2 users are earlier than signal transmission points of time of the N3 users and generates radio resource control signals.

37. The transmission method in accordance with claim 32, wherein

the transmission signal control step estimates, in the determination of the application or non-application of the beam forming for the N1 users, first reception quality when the beam forming is not applied, by using the profile information items;

determines the non-application of the beam forming if the first reception quality exceeds a predetermined value;

estimates, if the first reception quality does not exceed the predetermined value, second reception quality when the beam forming is applied;

determines the application of the beam forming if the second reception quality exceeds the first reception quality, determines the non-application of the beam forming if the second reception quality does not exceed the first reception quality, and generates the transmission mode control signals.

38. The transmission method in accordance with claim 32, wherein

the transmission signal control step conducts, in the determination of the application or non-application of the beam forming for the N1 users by using the profile information items and the radio resource amount control signals, the determination through primary determination and secondary determination;

carries out the primary determination using the first profile information items attained by when the second determination is started, determines the application or non-application of the beam forming by accomplishing the secondary determination by use of second profile information items requiring only the primary determination users determined in the primary determination to conduct the feedback or by use of only the second profile or both of the first and second profiles; and

thereby generating the transmission mode control signals.

39. The transmission method in accordance with claim 38, characterized in that

the transmission signal control step determines, as the primary determination users, users having K elements (K is an integer equal to or more than one) included in the first profile information items, the K elements including K1 elements (K1 is an integer equal to or more than one and equal to or less than k) exceeding a predetermined reference value.

40. The transmission method in accordance with claim 38, characterized in that

the transmission signal control step determines, as the primary determination users, users having K elements included in the first profile information items, the K elements including K2 elements (K2 is an integer equal to or more than one and equal to or less than k) all of which exceeding a predetermined reference value.

41. The transmission method in accordance with claim 38, characterized in that

the transmission signal control step adopts, as the first profile information, a radio resource amount necessary for the feedback of the second profile information.

42. The transmission method in accordance with claim 38, characterized in that

the transmission signal control step determines priority levels of the primary determination users by use of L1 elements selected from L elements included in the second profile information (L is an integer equal to or more than one;

L1 is an integer equal to or more than one and equal to or less than L) and determines, as the secondary determination, users having a priority level exceeding a predetermined priority level.

43. The transmission method in accordance with claim 33, wherein

the transmission signal control step estimates, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, first reception quality when the beam forming is not applied;

provisionally determines the non-application of beam forming if the first reception quality exceeds a predetermined value;

estimates, if the first reception quality does not exceed the predetermined value, second reception quality when the beam forming is applied;

provisionally determines the application of beam forming if the second reception quality exceeds the first reception quality;

provisionally determines the non-application of beam forming if the second reception quality does not exceed the first reception quality; and

thereby produces the provisional transmission mode control signals.

44. The transmission method in accordance with claim 33, wherein

the transmission signal control step provisionally determines, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, the application of beam forming for users whose P elements (P is an integer equal to or more than one) included in the profile information items include P1 elements (P is an integer equal to or more than one and equal to or less than P) exceeding a predetermined reference value;

provisionally determines the non-application for the other users, and thereby produces the provisional transmission mode control signals.

45. The transmission method in accordance with claim 33, wherein

the transmission signal control step provisionally determines, in the provisional determination of the application or non-application of beam forming for each of the N users by use of the profile information items, the application of beam forming for users whose P elements (P is an integer equal to or more than one) included in the profile information items include a predetermined number P2 elements (P2 is an integer equal to or more than one and equal to or less than P) all of which exceeding a reference value;

provisionally determines the non-application of beam forming for the other users, and thereby produces the provisional transmission mode control signals.

46. A program of a transmission method for a transmitter comprising M antennas (M is an integer equal to or more than two) to transmit signals to a receiver, the program causing a computer to perform

transmission signal control processing for receiving as inputs thereto profile information items of N users (N is an integer equal to or more than two);

determining, by use of the profile information items, a radio resource amount to be distributed to each of the N users and assignment thereof as well as application or non-application of beam forming; and

creating and outputting radio resource control signals indicating the radio resource amount to be distributed and the assignment thereof and transmission mode control signals indicating a result of the application or non-application; and

transmission signal creating processing for receiving as inputs thereto transmission data items of the N users, the radio resource control signals, and the transmission mode control signals;

allocating radio resources to N1 users (N1 is an integer equal to or more than one and equal to less than N) to which radio resources are allocated on the basis of the radio resource control signals, creating the transmission signals using the transmission data items by applying the beam forming for N2 users (N2 is an integer equal to or more than zero and equal to less than N1) for whom the transmission mode control signals indicate the application, creating the transmission signals using the transmission data items without applying the beam forming for N3 users (N3 is an integer equal to or more than zero and equal to less than N1 and N2+N3=N1) for whom the transmission mode control signals indicate the non-application, and outputting the transmission signals thus created.

47. A recording medium for recording the program of claim 46.