Radio communication system and communication control method

• US 10,285,192 B2
• Filed: 03/15/2017
• Issued: 05/07/2019
• 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
• Primary Examiner(s): Wu, Jianye
• Application Number:
  US15/459,410
• Publication Number:
  US 20170251490A1
• Time in Patent Office: 783 Days
• 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. An eNB comprising:

a controller configured to scramble, by using a cell ID, a first schedule assignment and control information carried on a physical downlink control channel (PDCCH), wherein

the controller is further configured to scramble, by using an ID regarding enhanced physical downlink control channel (EPDCCH), a second schedule assignment carried on an EPDCCH; and

a transmitter is configured to transmit, to a user equipment (UE), an EPDCCH-config including the ID regarding EPDCCH.

2. The eNB according to the claim 1, wherein

the transmitter configured to transmit to the UE, the EPDCCH-config on radio resource control (RRC) signaling.

3. The eNB according to the claim 1, wherein

the ID is independent of the cell ID.

4. The eNB according to the claim 1, wherein

the cell ID is used for a scrambling initialization value c_init,1 as follows:

5. The eNB according to the claim 1, wherein

the transmitter is further configured to transmit, to the UE, the scrambled first schedule assignment and the control information and the scrambled second schedule assignment.

6. An eNB comprising:

a controller configured to scramble, by using a cell ID, a first schedule assignment and a control information carried on a physical downlink control channel (PDCCH), wherein

the controller is further configured to scramble, by using a parameter which is included in an enhanced physical downlink control channel config (EPDCCH-config), a second schedule assignment carried on an EPDCCH.

7. The eNB according to the claim 6, wherein

the transmitter configured to transmit to a user equipment (UE), the EPDCCH-config on radio resource control (RRC) signaling.

8. The eNB according to the claim 6, wherein

the parameter is independent of the cell ID.

9. The eNB according to the claim 6, wherein

the cell ID is used for a scrambling initialization value c_init,1 as follows:

10. The eNB according to the claim 6, wherein

the transmitter is further configured to transmit, to the UE, the scrambled first schedule assignment and the control information and the scrambled second schedule assignment.

11. A user equipment (UE) comprising:

a receiver configured to;

receive, from an eNB, a scrambled first schedule assignment and a control information carried on a physical downlink control channel (PDCCH), which the first schedule assignment and the control information are scrambled by using a cell ID;

receive, from the eNB, a scrambled second schedule assignment carried on an enhanced physical downlink control channel (EPDCCH), which the second schedule assignment is scrambled by using an ID regarding EPDCCH; and

receive, from the eNB, an EPDCCH-config including the ID; and

a detector configured to;

descramble the first schedule assignment and the control information in accordance with the cell ID; and

descramble the second schedule assignment in accordance with the ID.

12. The UE according to the claim 11, wherein

the EPDCCH-config is received on radio resource control (RRC) signaling.

13. The UE according to the claim 11, wherein

the ID is independent of the cell ID.

14. The UE according to the claim 11, wherein

the cell ID is used for a scrambling initialization value c_init,1 as follows:

15. A user equipment (UE) comprising:

a detector configured to descramble a first schedule assignment and a control information, carried on a physical downlink control channel (PDCCH), in accordance with a cell ID, wherein

the detector is further configured to descramble a second schedule assignment, carried on an enhanced physical downlink control channel (EPDCCH), in accordance with a parameter included in an EPDCCH-config.

16. The UE according to the claim 15, wherein

the EPDCCH-config is received, from an eNB, on radio resource control (RRC) signaling.

17. The UE according to the claim 15, wherein

the first schedule assignment and the control information and the second schedule assignment are received from an eNB.

18. The UE according to the claim 15, wherein

the parameter is independent of the cell ID.

19. The UE according to the claim 15, wherein

the cell ID is used for a scrambling initialization value c_init,1 as follows:

20. A communication method of an eNB, comprising:

scrambling, by using a cell ID, a first schedule assignment and control information carried on a physical downlink control channel (PDCCH);

scrambling, by using an ID regarding enhanced physical downlink control channel (EPDCCH), a second schedule assignment carried on an EPDCCH; and

transmitting, to a user equipment (UE), an EPDCCH-config including the ID regarding EPDCCH.

21. The communication method according to the claim 20, wherein

the EPDCCH-config is transmitted to the UE, on radio resource control (RRC) signaling.

22. The communication method according to the claim 20, wherein

the ID is independent of the cell ID.

23. The communication method according to the claim 20, wherein

the cell ID is used for a scrambling initialization value c_init,1 as follows:

24. The communication method according to the claim 20, wherein

the scrambled first schedule assignment and the control information and the scrambled second schedule assignment are transmitted to the UE.

25. A communication method of an eNB, comprising:

scrambling, by using a cell ID, a first schedule assignment and a control information carried on a physical downlink control channel (PDCCH); and

scrambling, by using a parameter which is included in an enhanced physical downlink control channel config (EPDCCH-config), a second schedule assignment carried on an EPDCCH.

26. The communication method according to the claim 25, wherein

the EPDCCH-config is transmitted to a user equipment (UE) on radio resource control (RRC) signaling.

27. The communication method according to the claim 25, wherein

the parameter is independent of the cell ID.

28. The communication method according to the claim 25, wherein

the cell ID is used for a scrambling initialization value c_init,1 as follows:

29. The communication method according to the claim 25, wherein

the scrambled first schedule assignment and the control information and the scrambled second schedule assignment are transmitted to the UE.

30. A communication method of a user equipment (UE), comprising:

receiving, from an eNB, a scrambled first schedule assignment and a control information carried on a physical downlink control channel (PDCCH), which the first schedule assignment and the control information are scrambled by using a cell ID;

receiving, from the eNB, a scrambled second schedule assignment carried on an enhanced physical downlink control channel (EPDCCH), which the second schedule assignment is scrambled by using an ID regarding EPDCCH;

receiving, from the eNB, an EPDCCH-config including the ID;

descrambling the first schedule assignment and the control information in accordance with the cell ID; and

descrambling the second schedule assignment in accordance with the ID.

31. The communication method according to the claim 30, wherein

the EPDCCH-config is received on radio resource control (RRC) signaling.

32. The communication method according to the claim 30, wherein

the ID is independent of the cell ID.

33. The communication method according to the claim 30, wherein

the cell ID is used for a scrambling initialization value c_init,1 as follows:

34. A communication method of a user equipment (UE), comprising:

descrambling a first schedule assignment and a control information, carried on a physical downlink control channel (PDCCH), in accordance with a cell ID; and

descrambling a second schedule assignment, carried on an enhanced physical downlink control channel (EPDCCH), in accordance with a parameter included in an EPDCCH-config.

35. The communication method according to the claim 34, wherein

the EPDCCH-config is received, from an eNB, on radio resource control (RRC) signaling.

36. The communication method according to the claim 34, wherein

the first schedule assignment and the control information and the second schedule assignment are received from an eNB.

37. The communication method according to the claim 34, wherein

the parameter is independent of the cell ID.

38. The communication method according to the claim 34, wherein

the cell ID is used for a scrambling initialization value c_init,1 as follows: