METHOD AND APPARATUS FOR TRANSMITTING SYNCHRONIZATION SIGNAL IN WIRELESS COMMUNICATION SYSTEM

• US 20140169327A1
• Filed: 07/27/2012
• Published: 06/19/2014
• Est. Priority Date: 07/27/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Jin Young, Kim, Ki Tae, Kim, Su Nam, Kang, Ji Won, Ihm, Bin Chul, Park, Sung Ho
• Granted Patent: US 9,350,502 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04J 11/0073 Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
• CPC Class Codes: H04J 11/0076 Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
• CPC Class Codes: H04J 11/0079 Acquisition of downlink reference signals, e.g. detection of cell-ID
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A method and an apparatus for transmitting data in a wireless communication system are provided. A base station transmits to a terminal a physical downlink control channel (PDCCH) through a macro node, and transmits a physical downlink shared channel (PDSCH) through at least one radio remote head (RRH) having a cell identity (ID) that is identical to the macro node, so as not to overlap in with the PDCCH in a time domain. A time gap can be set between a last orthogonal frequency division multiplexing (OFDM) symbol to which the PDCCH is allocated and a first OFDM symbol to which the PDSCH is allocated.

Claims

1. A method for transmitting, by a base station, data in a wireless communication system, the method comprising:

transmitting a physical downlink control channel (PDCCH) to a user equipment through a macro node; and

transmitting a physical downlink shared channel (PDSCH), so as not to overlap with the PDCCH in time domain, to the user equipment through at least one radio remote head (RRH) having a cell identity (ID) that is identical to that of the macro node.

2. The method of claim 1, further comprising:

setting a time gap between a last orthogonal frequency division multiplexing (OFDM) symbol to which the PDCCH is allocated and a first OFDM symbol to which the PDSCH is allocated.

3. The method of claim 2, further comprising:

transmitting information on the time gap to the user equipment.

4. The method of claim 3, wherein the information on the time gap is transmitted in a cell-specific manner or a user equipment specific manner.

5. The method of claim 3, wherein the information on the time gap is transmitted through an enhanced physical downlink control channel (e-PDCCH) allocated in a data region.

6. The method of claim 1, further comprising:

receiving an indicator, which indicates that a time when the user equipment is synchronized with the macro node is later than a time when the user equipment is synchronized with the at least one RRH, from the user equipment.

7. The method of claim 1, further comprising:

transmitting a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) to the user equipment through the macro node.

8. The method of claim 1, further comprising:

transmitting a third synchronization signal (TSS) to the user equipment through the at least one RRH.

9. A method for receiving, by a user equipment, data in a wireless communication system, the method comprising:

performing synchronization with a macro node based on at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS);

performing synchronization with at least one radio remote head (RRH), having a cell identity (ID) that is identical to that of the macro node, based on a third synchronization signal (TSS);

receiving a physical downlink control channel (PDCCH) through the macro node; and

receiving a physical downlink shared channel (PDSCH), which does not overlap with the PDCCH in time domain, through the at least one RRH.

10. The method of claim 9, further comprising:

transmitting an indicator, which indicates that a time synchronized with the macro node is later than a time synchronized with the at least one RRH, to a base station.

11. The method of claim 9, wherein a time gap is set between a last orthogonal frequency division multiplexing (OFDM) symbol to which the PDCCH is allocated and a first OFDM symbol to which the PDSCH is allocated.

12. The method of claim 11, further comprising:

receiving information on the time gap from a base station.

13. The method of claim 12, wherein the information on the time gap is received in a cell-specific manner or a user equipment specific manner.

14. The method of claim 12, wherein the information on the time gap is received through an enhanced physical downlink control channel (e-PDCCH) allocated in a data region.

15. The method of claim 9, further comprising:

decoding the received PDCCH and the received PDSCH.