RADIO COMMUNICATION SYSTEM AND COMMUNICATION CONTROL METHOD

• US 20150043457A1
• Filed: 01/30/2012
• Published: 02/12/2015
• Est. Priority Date: 01/30/2012
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Liu, Le, Kakura, Yoshikazu, Ishii, Naoto, Inoue, Takamichi
• Granted Patent: US 9,634,740 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems

Abstract

A radio communication system includes: a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at lease two user terminals connected to different serving cells; and a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.

Claims

1. A radio communication system comprising:

a plurality of cells having different scrambling sequences, respectively, wherein at least two cells communicate with at least two user terminals connected to different serving cells; and

a controller which controls the plurality of cells and provides a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.

2. The radio communication system according to claim 1, wherein control signals of said at least two user terminals are scrambled using the single scrambling sequence in said at least two cells and said at least two user terminals.

3. The radio communication system according to claim 1, wherein the controller allocates a reserved radio resource region for control signals of said at least two user terminals.

4. The radio communication system according to claim 3, wherein the controller dynamically allocates resources for control signals of said at least two user terminals within the reserved radio resource region.

5. The radio communication system according to claim 1, wherein each of a plurality of cells is generated by a transmission/reception unit which is controlled by the controller.

6. The radio communication system according to claim 5, wherein said at least two user terminals share a coordinated multipoint (CoMP) cooperating set which is a set of geographically separated transmission/reception units directly or indirectly participating in user data transmission in a time-frequency resource.

7. The radio communication system according to claim 5, wherein the controller allocates a reserved radio resource region for control signals of said at least two user terminals, wherein the controller simultaneously or independently sends a first signal for sharing the single scrambling sequence and a second signal for sharing a location of the reserved radio resource region among said at least two user terminals.

8. The radio communication system according to claim 1, wherein the single scrambling sequence is generated from a predetermined initialization value.

9. The radio communication system according to claim 8, wherein a predetermined parameter for determining the predetermined initialization value is an identity different from cell identities of said at least two cells.

10. The radio communication system according to claim 8, wherein the predetermined parameter for determining the predetermined initialization value is an identity identical to one selected from cell identities of said at least two cells.

11. The radio communication system according to claim 1, wherein a plurality of transmission/reception units generating respective ones of the plurality of cells is provided in a base station of the radio communication system.

12. The radio communication system according to claim 1, wherein a plurality of transmission/reception units generating respective ones of the plurality of cells is provided in different base stations of the radio communication system.

13. A method for controlling a plurality of cells having different scrambling sequences in a radio communication system, comprising:

setting at least two cells which communicate with at lease two user terminals connected to different serving cells; and

providing a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.

14. The method according to claim 13, further comprising:

scrambling control signals of said at least two user terminals using the single scrambling sequence in said at least two cells and said at least two user terminals.

15. The method according to claim 13, further comprising:

allocating a reserved radio resource region for control signals of said at least two user terminals.

16. The method according to claim 15, wherein resources for control signals of said at least two user terminals are dynamically allocated within the reserved radio resource region.

17. The method according to claim 13, wherein each of the plurality of cells is generated by a transmission/reception unit which is controlled by the controller.

18. The method according to claim 17, wherein said at least two user terminals share a coordinated multipoint (CoMP) cooperating set which is a set of geographically separated transmission/reception units directly or indirectly participating in user data transmission in a time-frequency resource.

19. The method according to claim 17, further comprising:

allocating a reserved radio resource region for control signals of said at least two user terminals; and

simultaneously or independently sending a first signal for sharing the single scrambling sequence and a second signal for sharing a location of the reserved radio resource region among said at least two user terminals.

20. The method according to claim 13, wherein the single scrambling sequence is generated from a predetermined initialization value.

21. The method according to claim 20, wherein a predetermined parameter for determining the predetermined initialization value is an identity different from cell identities of said at least two cells.

22. The method according to claim 20, wherein the predetermined parameter for determining the predetermined initialization value is an identity identical to one selected from cell identities of said at least two cells.

23. The method according to claim 13, wherein a plurality of transmission/reception units generating respective ones of the plurality of cells is provided in a base station of the radio communication system.

24. The method according to claim 13, wherein a plurality of transmission/reception units generating respective ones of the plurality of cells is provided in different base stations of the radio communication system.

25. A control device for controlling a plurality of cells having different scrambling sequences in a radio communication system, comprising:

a setting section for setting at least two cells which communicate with at least two user terminals connected to different serving cells; and

a communication controller for providing a single scrambling sequence to said at least two cells and said at least two user terminals for control signal transmission and reception.

26. The control device according to claim 25, wherein the communication controller scrambles control signals of said at least two user terminals using the single scrambling sequence in said at least two cells and said at least two user terminals.

27. The control device according to claim 25, further comprising:

a resource reservation section for allocating a reserved radio resource region for control signals of said at least two user terminals.

28. The control device according to claim 27, wherein the resource reservation section dynamically allocates resources for control signals of said at least two user terminals within the reserved radio resource region.

29. The control device according to claim 25, wherein each of the plurality of cells is generated by a transmission/reception unit.

30. The control device according to claim 29, wherein said at least two user terminals share a coordinated multipoint (CoMP) cooperating set which is a set of geographically separated transmission/reception units directly or indirectly participating in user data transmission in a time-frequency resource.

31. The control device according to claim 29, wherein the resource reservation section allocates a reserved radio resource region for control signals of said at least two user terminals, wherein the communication controller simultaneously or independently sends a first signal for sharing the single scrambling sequence and a second signal for sharing a location of the reserved radio resource region among said at least two user terminals.

32. The control device according to claim 25, wherein the single scrambling sequence is generated from a predetermined initialization value.

33. The control device according to claim 32, wherein a predetermined parameter for determining the predetermined initialization value is an identity different from cell identities of said at least two cells.

34. The control device according to claim 32, wherein the predetermined parameter for determining the predetermined initialization value is an identity identical to one selected from cell identities of said at least two cells.

35. The control device according to claim 25, wherein a plurality of transmission/reception units generating respective ones of the plurality of cells is provided in a base station of the radio communication system.

36. The control device according to claim 25, wherein a plurality of transmission/reception units generating respective ones of the plurality of cells is provided in different base stations of the radio communication system.

37. A base station which communicates with at least one user terminal in its own cell, comprising:

a setting section for setting at least one other cell as a cooperating cell in which at least one other user terminal is connected to the at least one other cell as a serving cell; and

a communication controller for providing a single scrambling sequence to its own cell, said at least one cell, said at least one user terminal and said at least one other user terminal, for control signal transmission and reception.