METHOD AND APPARATUS FOR REFERENCE SIGNALING ALLOCATION AND CHANNEL ESTIMATION IN DISTRIBUTED ANTENNA SYSTEMS

• US 20130163499A1
• Filed: 12/05/2011
• Published: 06/27/2013
• Est. Priority Date: 12/03/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: CHENG, Shan, Kim, Youn Sun, Lee, Ju Ho, Han, Jin Kyu
• Granted Patent: US 9,780,901 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04J 11/0079 Acquisition of downlink reference signals, e.g. detection of cell-ID
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0069 Allocation based on distance or geographical location allocation based on terminal or device properties in general, H04W72/51
• CPC Class Codes: H04L 5/008 once only, on installation
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

An apparatus and method for transmitting reference signals in a communication system are provided. The method includes transmitting common reference signals of a first type from a transmitter to a plurality of receivers; transmitting receiver-specific reference signals of a second type from a plurality of distributed ports to a subset of the plurality of receivers; wherein the common reference signals of the first type and the receiver-specific reference signals of the second type are allocated to different resources from one another, and wherein the communication system includes the transmitter and the plurality of receivers and the transmitter uses a plurality of central ports and the plurality of distributed ports to transmit to the plurality of receivers.

Claims

1. A method for transmitting reference signals in a communication system, the method comprising;

transmitting common reference signals of a first type from a transmitter to a plurality of receivers;

transmitting receiver-specific reference signals of a second type from a plurality of distributed ports to a subset of the plurality of receivers;

wherein the common reference signals of the first type and the receiver-specific reference signals of the second type are allocated different resources from one another, and

wherein the communication system includes the transmitter and the plurality of receivers and the transmitter uses a plurality of central ports and the plurality of distributed ports to transmit to the plurality of receivers.

2. The method of claim 1, wherein the common reference signals of the first type are transmitted on every resource block scheduled contiguously in the frequency domain.

3. The method of claim 1, wherein the resource and the different resource are partitioned into multiple two-dimensional resource blocks in both frequency and time dimensions.

4. The method of claim 1, wherein the receiver-specific reference signals of the second type for one of the subset of the plurality of receivers are transmitted on a plurality of contiguous resource blocks within a sub-band of the system bandwidth in the frequency domain.

5. The method of claim 1, wherein the receiver-specific reference signals of the second type for one of the subset of the plurality of receivers are transmitted on every several resource blocks scheduled within a sub-band of the system bandwidth in the frequency domain.

6. The method of claim 1, wherein transmitting the common reference signals of the first type comprises;

broadcasting on which resource elements the common reference signals of the first type for one of the plurality of distributed ports are transmitted prior to the transmission of the common reference signals of the first type .

7. The method of claim 1, wherein transmitting receiver-specific reference signals of the second type comprises;

indicating to a receiver on which resource elements the receiver-specific reference signals of the second type of one of a plurality of distributed ports is transmitted to the receiver prior to the transmission of the receiver-specific reference signals of the second type.

8. A communication system, the system comprising;

a transmitter which uses a plurality of central ports and a plurality of distributed ports to transmit to a plurality of receivers, transmits common reference signals of a first type from the plurality of central ports to the plurality of receivers, transmits a receiver-specific reference signals of a second type from the plurality of distributed ports to a subset of the plurality of receivers;

the plurality of receivers which receives configurations of the common reference signals of the first type and the receiver-specific reference signals of the second type; and

wherein the common reference signals of the first type and the receiver-specific reference signals of the second type are allocated different resources from one another.

9. The communication system of claim 8, wherein the common reference signals of the first type are transmitted on every resource block scheduled in the frequency domain.

10. The communication system of claim 8, wherein the resource and the different resource are partitioned into multiple two-dimensional resource blocks in both frequency and time dimensions.

11. The communication system of claim 9, wherein the receiver-specific reference signals of the second type of are transmitted on a plurality of contiguous resource blocks within a sub-band of the system bandwidth in the frequency domain.

12. The communication system of claim 10, wherein the receiver-specific reference signals of the second type are transmitted on every several resource blocks within a sub-band of the system bandwidth in the frequency domain when scheduled.

13. The communication system of claim 8, wherein the transmitter broadcasts on which resource elements the common reference signals of the first type of distributed port are transmitted prior to the transmission of the common reference signals of the first type.

14. The communication system of claim 8, wherein the transmitter indicates to a receiver on which resource elements the receiver-specific reference signals of a second type of distributed port are transmitted to the receiver prior to the transmission of the receiver-specific reference signals of the second type.