Cell ID and antenna port configurations for EPDCCH

• US 9,155,089 B2
• Filed: 02/12/2013
• Issued: 10/06/2015
• Est. Priority Date: 08/10/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gaal, Peter, Chen, Wanshi, Xu, Hao
• Primary Examiner(s): Jaroenchonwanit, Bunjob
• Application Number:
  US13/765,596
• Publication Number:
  US 20140044057A1
• Time in Patent Office: 966 Days
• Field of Search: 370/310, 370329-337
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0025 Spatial division following the spatial signature of the channel
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• 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 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method of wireless communication is provided which includes determining a first cell identification (ID) for scrambling a first reference signal of a first enhanced physical downlink control channel (EPDCCH) and determining a second cell ID for scrambling a second reference signal of a second EPDCCH. The second cell ID is based at least in part on the first cell ID. The first reference signal and the second reference signal are mapped to a same set of resources. The method also includes transmitting the first EPDCCH and second EPDCCH.

Claims

1. A method of wireless communication, comprising:

determining whether a first set of resource elements for a first reference signal, for at least a first user equipment (UE), of a first enhanced physical downlink control channel (EPDCCH) and a second set of resource elements for a second reference signal, for at least a second UE, of a second EPDCCH are selected from a same plurality of resource elements, and in which the first reference signal and the second reference signal are transmitted from a same set of antenna ports;

determining a cell identification (ID) for scrambling the first reference signal and for scrambling the second reference signal when the first set of resource elements and the second set of resource elements are selected from the same plurality of resource elements, the first set of resource elements being different from the second set of resource elements; and

transmitting the first EPDCCH and the second EPDCCH.

2. The method of claim 1, in which the cell ID is a physical cell ID.

3. The method of claim 1, in which the cell ID is a virtual cell ID.

4. The method of claim 1, in which the first EPDCCH is a distributed EPDCCH and the second EPDCCH is a localized EPDCCH.

5. The method of claim 1, in which both the first EPDCCH and the second EPDCCH are distributed EPDCCH.

6. The method of claim 1, in which the first EPDCCH is a unicast EPDCCH and the second EPDCCH is a broadcast EPDCCH.

7. The method of claim 1, in which the first EPDCCH is from a common search space and the second EPDCCH is from a user equipment-specific search space.

8. An apparatus for wireless communications, comprising:

a memory; and

at least one processor coupled to the memory, the at least one processor being configured;

to determine whether a first set of resource elements for a first reference signal, for at least a first user equipment (UE), of a first enhanced physical downlink control channel (EPDCCH) and a second set of resource elements for a second reference signal, for at least a second UE, of a second EPDCCH are selected from a same plurality of resource elements, and in which the first reference signal and the second reference signal are transmitted from a same set of antenna ports;

to determine a first cell identification (ID) for scrambling the first reference signal and for scrambling the second reference signal when the first set of resource elements and the second set of resource elements are selected from the same plurality of resource elements, the first set of resource elements being different from the second set of resource elements; and

to transmit the first EPDCCH and the second EPDCCH.

9. The apparatus of claim 8, in which the first cell ID is a physical cell ID.

10. The apparatus of claim 8, in which the first cell ID is a first virtual cell ID.

11. The apparatus of claim 8, in which the first EPDCCH is a distributed EPDCCH and the second EPDCCH is a localized EPDCCH.

12. The apparatus of claim 8, in which both the first EPDCCH and the second EPDCCH are distributed EPDCCH.

13. The apparatus of claim 8, in which the first EPDCCH is a unicast EPDCCH and the second EPDCCH is a broadcast EPDCCH.

14. The apparatus of claim 8, in which the first EPDCCH is from a common search space and the second EPDCCH is from a user equipment-specific search space.

15. An apparatus for wireless communications, comprising:

means for determining whether a first set of resource elements for a first reference signal, for at least a first user equipment (UE), of a first enhanced physical downlink control channel (EPDCCH) and a second set of resource elements for a second reference signal, for at least a second UE, of a second EPDCCH are selected from a same plurality of resource elements, and in which the first reference signal and the second reference signal are transmitted from a same set of antenna ports;

means for determining a cell identification (ID) for scrambling the first reference signal and for scrambling the second reference signal when the first set of resource elements and the second set of resource elements are selected from the same plurality of resource elements, the first set of resource elements being different from the second set of resource elements;

means for processing the first reference signal and the second reference signal based on the cell ID for scrambling; and

means for transmitting the first EPDCCH and the second EPDCCH.

16. A computer program product for wireless communications, the computer program product comprising:

a non-transitory computer-readable medium having program code recorded thereon, the program code comprising;

program code to determine whether a first set of resource elements for a first reference signal, for at least a first user equipment (UE), of a first enhanced physical downlink control channel (EPDCCH) and a second set of resource elements for a second reference signal, for at least a second UE, of a second EPDCCH are selected from a same plurality of resource elements, and in which the first reference signal and the second reference signal are transmitted from a same set of antenna ports;

program code to determine a cell identification (ID) for scrambling the first reference signal and for scrambling the second reference signal when the first set of resource elements and the second set of resource elements are selected from the same plurality of resource elements, the first set of resource elements being different from the second set of resource elements; and

program code to transmit the first EPDCCH and the second EPDCCH.