METHOD AND APPARATUS FOR USER-SPECIFIC REFERENCE SIGNALING ALLOCATION OF CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEMS

• US 20120275406A1
• Filed: 04/30/2012
• Published: 11/01/2012
• Est. Priority Date: 04/29/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: JI, Hyoungju, Shan, Cheng, Kim, Younsun, Cho, Joonyoung
• Granted Patent: US 9,479,307 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• 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
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

A new structure of user-specific reference signals design is provided. Higher spectrum efficiency is achieved, and two users may share the same resource for control signal transmission in a distributed antenna system via different distributed antennas. In addition, search space overlapping is enabled and thus control resource reuse is made possible.

Claims

1. A method for user-specific reference signaling allocation of control channel at an Evolved Node B (eNB), the method comprising:

receiving channel information;

determining whether to transmit a Physical Download Control CHannel (PDCCH) including a user-specific reference signal based on the channel information;

allocating, if a transmission of the PDCCH including a user-specific reference signal is determined, the user-specific reference signal to a resource element, wherein the resource element is predefined according to User Equipment (UE) information; and

transmitting the PDCCH including the user-specific reference signal.

2. The method of claim 1, wherein the UE information is a UE Identification (ID) and the resource element is predefined by a function of the UE ID.

3. The method of claim 2, wherein the function of UE ID is determined by, I_RS=UE ID mod 4, I_RS=0-3

wherein I_RS is a reference signal position index.

4. The method of claim 1, wherein determining whether to transmit the PDCCH including the user-specific reference signal is based on improvement of the PDCCH performance and a size of a Download Control Information (DCI) format.

5. The method of claim 1, wherein the resource element is a sub-carrier in an Orthogonal Frequency Division Multiplexing (OFDM) symbol.

6. A method for user-specific reference signaling allocation of control channel at a User Equipment (UE), the method comprising:

receiving a Physical Download Control CHannel (PDCCH);

determining whether the PDCCH includes a user-specific reference signal; and

decoding, if the PDCCH includes the user-specific reference signal, a resource element including the user-specific reference signal, wherein the resource element is predefined according to UE information.

7. The method of claim 6, wherein the UE information is a UE Identification (ID) and the resource element is predefined by a function of the UE ID.

8. The method of claim 7, wherein the function of the UE ID is determined by,

I_RS=UE ID mod 4, I_RS=0-3

wherein I_RS is a reference signal position index.

9. The method of claim 6, further comprising:

receiving a Physical Download Shared CHannel (PDSCH) respective to the PDCCH including the user-specific reference signal.

10. The method of claim 6, wherein the resource element is a sub-carrier in an Orthogonal Frequency Division Multiplexing (OFDM) symbol.

11. An apparatus for user-specific reference signaling allocation of control channel at an Evolved Node B (eNB), the apparatus comprising:

a transceiver which transmits and receives data; and

a controller which controls receiving channel information, determining whether to transmit a Physical Download Control CHannel (PDCCH) including a user-specific reference signal based on the channel information, allocating, if a transmission of the PDCCH including the user-specific reference signal is determined, the user-specific reference signal to a resource element, wherein the resource element is predefined according to User Equipment (UE) information, and transmitting the PDCCH including the user-specific reference signal.

12. The apparatus of claim 11, wherein the UE information is a UE IDentification (ID) and the resource element is predefined by a function of the UE ID.

13. The apparatus of claim 12, wherein the function of the UE ID is determined by,

I_RS=UE ID mod 4, I_RS=0-3

wherein I_RS is a reference signal position index.

14. The apparatus of claim 11, wherein the controller controls determining whether to transmit a Physical Download Control CHannel (PDCCH) including the user-specific reference signal based on improvement of the PDCCH performance and a size of a Download Control Information (DCI) format.

15. The apparatus of claim 11, wherein the resource element is a sub-carrier in an Orthogonal Frequency Division Multiplexing (OFDM) symbol.

16. An apparatus for user-specific reference signaling allocation of control channel at a User Equipment (UE), the apparatus comprising:

a transceiver which transmits and receives data; and

a controller which controls receiving a Physical Download Control CHannel (PDCCH), determining whether the PDCCH includes a user-specific reference signal, and decoding, if the PDCCH includes a user-specific reference signal, a resource element including the user-specific reference signal, wherein the resource element is predefined according to UE information.

17. The apparatus of claim 16, wherein the UE information is a UE IDentification (ID) and the resource element is predefined by a function of the UE ID.

18. The apparatus of claim 17, wherein the function of UE ID is determined by,

I_RS=UE ID mod 4, I_RS=0-3

wherein I_RS is a reference signal position index.

19. The apparatus of claim 16, wherein the controller controls receiving a Physical Download Shared CHannel (PDSCH) respective to the PDCCH including the user-specific reference signal.

20. The apparatus of claim 16, wherein the resource element is a sub-carrier in an Orthogonal Frequency Division Multiplexing (OFDM) symbol.