METHOD AND APPARATUS FOR COOPERATIVE TRANSMISSION IN MULTI-NODE SYSTEM

• US 20120140660A1
• Filed: 12/02/2011
• Published: 06/07/2012
• Est. Priority Date: 12/03/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Jin Young, Lee, Moon Il, Kim, Ki Tae, Kim, Su Nam, Ihm, Bin Chul, Park, Sung Ho, Kang, Ji Won
• Granted Patent: US 9,191,157 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0643 Feedback on request
• CPC Class Codes: H04B 7/065 Variable contents, e.g. long-term or short-short
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0077 Cooperative coding
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A method of performing cooperative transmission in a multi-node system including a Base Station (BS) and a plurality of nodes controlled by the BS is provided. The method comprises: transmitting a first signal generated using a first cell identifier (ID) from the plurality of nodes; and transmitting a second signal generated using a second cell ID from at least one of the plurality of nodes, wherein the first cell ID is identical with a cell ID used by the BS, and the second cell ID is different from the first cell ID.

Claims

1. A method of performing signal transmission in a multi-node system including a Base Station (BS) and a plurality of nodes controlled by the BS, the method comprising:

transmitting a first signal generated using a first cell identifier (ID) from at least one of the plurality of nodes and the BS; and

transmitting a second signal generated using a second cell ID from at least one of the plurality of nodes,

wherein the first cell ID is identical with a cell ID used by the BS, and the second cell ID is different from the first cell ID.

2. The method of claim 1, wherein the first signal includes at least one of system information, control information, and information related to cell selection.

3. The method of claim 1, wherein the second signal includes at least one reference signal (RS) among a channel state information RS, demodulation RS, and positioning RS.

4. The method of claim 1, further comprising:

requesting, from the BS, a channel information feedback between the node transmitting the second signal and User Equipment (UE), to the UE,

wherein the signal to request the channel information feedback includes the second cell ID.

5. The method of claim 1, further comprising:

transmitting, from the BS, a cell ID for each of the plurality of nodes and an indicator, indicating whether each of the plurality of nodes participates in the cooperative transmission, to the UE.

6. The method of claim 1, wherein some bits of the second cell ID are identical with some bits of the first cell ID.

7. The method of claim 1, further comprising:

transmitting, from the BS, a message, indicating a feedback information type, to the UE if the node transmitting the second signal is plural,

wherein the message to indicate the feedback information type indicates whether the BS participates in the cooperative transmission or the BS does not participate in the cooperative transmission.

8. The method of claim 7, wherein the message to indicate the feedback information type is composed of 1 bit.

9. The method of claim 1, further comprising:

transmitting, from the BS, information, informing the node sending the second signal, to first UE,

if the node sending the second signal transmits the second signal to the first UE.

10. An operating method of User Equipment (UE) in a multi-node system including a Base Station (BS) and a plurality of nodes controlled by the BS, the operating method comprising:

receiving a first signal, generated using a first cell identifier (ID), from at least one of the plurality of nodes and the BS;

receiving, from the BS, a signal to request a channel information feedback for a node sending a second signal, generated using a second cell ID, and information indicating the node sending the second signal;

receiving the second signal;

feeding channel information, measured using the second signal, back to the BS,

wherein the first cell ID is identical with a cell ID used by the BS, and the second cell ID is different from the first cell ID.

11. The operating method of claim 10, wherein the first signal includes at least one of system information, control information, and information related to cell selection.

12. The method of claim 10, wherein the second signal includes at least one reference signal (RS) among a Channel state Information-RS, a demodulation RS, and a positioning RS.

13. The operating method of claim 10, further comprising:

receiving a message, indicating a feedback information type, from the BS if the node sending the second signal is plural,

wherein the message to indicate the feedback information type indicates whether the BS participates in the cooperative transmission or the BS does not participate in the cooperative transmission.

14. The operating method of claim 10, further comprising:

receiving information, informing the node sending the second signal, from the BS.

15. An operating method of User Equipment (UE) in a multi-node system including a Base Station (BS) and a plurality of nodes controlled by the BS, the operating method comprising:

receiving a first cell identifier (ID) and a second cell ID from the BS;

transmitting an uplink signal to at least one node among the plurality of nodes using the second cell ID;

wherein the first cell ID is a common cell ID used by the BS and the plurality of nodes when receiving an uplink signal, and the second cell ID is a dedicated cell ID used by the at least one node of the plurality of nodes when receiving an uplink signal.

16. The operating method of claim 15,

wherein the uplink signal transmitted by the UE comprises at least one signal among a sounding reference signal, a demodulation reference signal for decoding uplink data, a signal transmitted to the at least one node through feedback channel.

17. User equipment, comprising:

a Radio Frequency (RF) unit configured to transmit and receive a radio signal; and

a processor coupled to the RF unit,

wherein the processor receives a first signal, generated using a first cell identifier (ID), from a plurality of nodes,

receives a signal to request a channel information feedback for a node sending a second signal, generated using a second cell ID, and information indicating the node sending the second signal from a Base Station (BS),

receives the second signal,

feeds channel information, measured using the second signal, back to the BS,

wherein the first cell ID is identical with a cell ID used by the BS, and the second cell ID is different from the first cell ID.