Reference signal design and association for physical downlink control channels

• US 9,603,125 B2
• Filed: 01/18/2013
• Issued: 03/21/2017
• Est. Priority Date: 01/19/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Papasakellariou, Aris, Cho, Joonyoung
• Primary Examiner(s): MILLS, DONALD L
• Application Number:
  US13/744,969
• Publication Number:
  US 20130188577A1
• Time in Patent Office: 1,523 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• 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 72/00 Local resource management
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

A method and apparatus for designing a Reference Signal (RS) used by a User Equipment (UE) to obtain respective channel estimates for demodulating respective Physical Downlink Control CHannels (PDCCHs), for determining at a UE a number of resource blocks to include for a reception of a Physical Downlink Shared CHannel (PDSCH), for determining at a UE a RS antenna port in order to enable spatial multiplexing of Enhanced PDCCH (EPDCCH) transmissions to different UEs, and for supporting Quadrature Amplitude Modulation 16 (QAM16) modulation, in addition to Quadrature Phase Shift Keying (QPSK) modulation, for EPDCCH transmissions without increasing a number of decoding operations at a UE are provided.

Claims

1. A method for receiving data in a user equipment (UE) from a base station in a mobile communication system, the method comprising:

receiving control information on an enhanced physical downlink control channel (EPDCCH) based on a demodulation reference signal (DM-RS) antenna port; and

receiving the data based on the control information,

wherein the DM-RS antenna port is determined based on information related to an enhanced control channel elements (ECCE) of the EPDCCH, a radio network temporary identity (RNTI) of the UE, and a number of ECCEs in the EPDCCH if a value of an aggregation level is larger than 1, and the DM-RS antenna port is determined based on the information related to the ECCE of the EPDCCH and the number of ECCEs in the EPDCCH with the exception of the RNTI of the UE if the value of the aggregation level is 1.

2. The method of claim 1, wherein the control information is received on the EPDCCH in a search space at the value of the aggregation level.

3. The method of claim 1, wherein a number of DM-RS antenna port candidates for the DM-RS antenna port is 4 if a number of enhanced resource-element groups (EREGs) per a ECCE is 4.

4. The method of claim 3, wherein a number of ECCEs in a physical resource block (PRB) set is 4.

5. The method of claim 1, wherein DM-RS antenna port candidates for the DM-RS antenna port are a first antenna port and a third antenna port among 4 DM-RS antenna ports if a number of enhanced resource-element groups (EREGs) per a ECCE is 8.

6. The method of claim 5, wherein a number of ECCEs in a physical resource block (PRB) set is 2.

7. The method of claim 1, wherein a number of DM-RS antenna port candidates for the DM-RS antenna port is 2 if an extended cyclic prefix (CP) is applied.

8. The method of claim 1, wherein the information related to the ECCE is an order of an EPDCCH candidate.

9. A method for transmitting data in a base station to a user equipment (UE) in a mobile communication system, the method comprising:

transmitting control information on an enhanced physical downlink control channel (EPDCCH) based on a demodulation reference signal (DM-RS) antenna port; and

transmitting the data based on the control information,

wherein the DM-RS antenna port is determined based on information related to an enhanced control channel elements (ECCE) of the EPDCCH, a radio network temporary identity (RNTI) of the UE, and a number of ECCEs in the EPDCCH if a value of an aggregation level is larger than 1, and the DM-RS antenna port is determined based on the information related to the ECCE of the EPDCCH and the number of ECCEs in the EPDCCH with the exception of the RNTI of the UE if the value of the aggregation level is 1.

10. The method of claim 9, the control information is transmitted on the EPDCCH in a search space at the value of the aggregation level.

11. The method of claim 9, wherein a number of DM-RS antenna port candidates for the DM-RS antenna port is 4 if a number of enhanced resource-element groups (EREGs) per a ECCE is 4.

12. The method of claim 11, wherein a number of ECCEs in a physical resource block (PRB) set is 4.

13. The method of claim 9, wherein DM-RS antenna port candidates for the DM-RS antenna port are a first antenna port and a third antenna port among 4 DM-RS antenna ports if a number of enhanced resource-element groups (EREGs) per a ECCE is 8.

14. The method of claim 13, wherein a number of ECCEs in a physical resource block (PRB) set is 2.

15. The method of claim 9, wherein a number of DM-RS antenna port candidates for the DM-RS antenna port is 2 if an extended cyclic prefix (CP) is applied.

16. The method of claim 9, wherein the information related to the ECCE is an order of an EPDCCH candidate.

17. A user equipment (UE) apparatus for receiving data from a base station in a mobile communication system, the apparatus comprising:

a transceiver for transmitting and receiving signals to and from the base station; and

a controller configured to control the transceiver to receive control information on an enhanced physical downlink control channel (EPDCCH) based on a demodulation reference signal (DM-RS) antenna port, and to receive the data based on the control information,

wherein the DM-RS antenna port is determined based on information related to an enhanced control channel elements (ECCE) of the EPDCCH, a radio network temporary identity (RNTI) of the UE, and a number of ECCEs in the EPDCCH if a value of an aggregation level is larger than 1, and the DM-RS antenna port is determined based on the information related to the ECCE of the EPDCCH and the number of ECCEs in the EPDCCH with the exception of the RNTI of the UE if the value of the aggregation level is 1.

18. The apparatus of claim 17, the controller is further configured for receiving the control information on the EPDCCH in a search space at the value of the aggregation level.

19. The apparatus of claim 17, wherein a number of DM-RS antenna port candidates for the DM-RS antenna port is 4 if a number of enhanced resource-element groups (EREGs) per a ECCE is 4.

20. The apparatus of claim 19, wherein a number of ECCEs in a physical resource block (PRB) set is 4.

21. The apparatus of claim 17, wherein DM-RS antenna port candidates for the DM-RS antenna port are a first antenna port and a third antenna port among 4 DM-RS antenna ports if a number of enhanced resource-element groups (EREGs) per a ECCE is 8.

22. The apparatus of claim 21, wherein a number of ECCEs in a physical resource block (PRB) set is 2.

23. The apparatus of claim 17, wherein a number of DM-RS antenna port candidates for the DM-RS antenna port is 2 if an extended cyclic prefix (CP) is applied.

24. The apparatus of claim 17, wherein the information related to the ECCE is an order of an EPDCCH candidate.

25. A base station apparatus for transmitting data to a user equipment (UE) apparatus in a mobile communication system, the apparatus comprising:

a transceiver for transmitting and receiving signals to and from the UE; and

a controller configured to control the transceiver to transmit control information on an enhanced physical downlink control channel (EPDCCH) based on a demodulation reference signal (DM-RS) antenna port, and to transmit the data based on the control information,

wherein the DM-RS antenna port is determined based on information related to an enhanced control channel elements (ECCE) of the EPDCCH, a radio network temporary identity (RNTI) of the UE, and a number of ECCEs in the EPDCCH if a value of an aggregation level is larger than 1, and the DM-RS antenna port is determined based on the information related to the ECCE of the EPDCCH and the number of ECCEs in the EPDCCH with the exception of the RNTI of the UE if the value of the aggregation level is 1.

26. The base station of claim 25, the controller is configured for transmitting the control information on the EPDCCH in a search space at the value of the aggregation level.

27. The base station of claim 25, wherein a number of DM-RS antenna port candidates for the DM-RS antenna port is 4 if a number of enhanced resource-element groups (EREGs) per a ECCE is 4.

28. The base station of claim 27, wherein a number of ECCEs in a physical resource block (PRB) set is 4.

29. The base station of claim 25, wherein DM-RS antenna port candidates for the DM-RS antenna port are a first antenna port and a third antenna port among 4 DM-RS antenna ports if a number of enhanced resource-element groups (EREGs) per a ECCE is 8.

30. The base station of claim 29, wherein a number of ECCEs in a physical resource block (PRB) set is 2.

31. The base station of claim 25, wherein a number of DM-RS antenna port candidates for the DM-RS antenna port is 2 if an extended cyclic prefix (CP) is applied.

32. The base station of claim 25, wherein the information related to the ECCE is an order of an EPDCCH candidate.