METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL

• US 20150055574A1
• Filed: 03/25/2013
• Published: 02/26/2015
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Bonghoe, Seo, Dongyoun, You, Hyangsun, Ahn, Joonkui
• Granted Patent: US 9,602,258 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• 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 2211/005 Long term evolution [LTE]
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling

Abstract

Disclosed are a method and an apparatus for transmitting a reference signal. The method for transmitting the reference signal comprises the step of: transmitting a secondary synchronization signal (SSS) and a primary synchronization signal (PSS) from a subframe including an N (natural number wherein N>1) number of resource blocks (RB) and a plurality of orthogonal frequency division multiplexing (OFDM) symbols; and transmitting from the subframe the reference signal which is generated on the basis of a cell identifier, wherein the reference signal can be transmitted from an M (natural number wherein K<=M<N) number of RBs which includes a K number of RBs in the OFDM symbols that remain after excluding the OFDM symbols from which the SSS and the PSS are transmitted. As a result, demodulation capability of a terminal can be increased.

Claims

1. A method for transmitting a reference signal, comprising:

transmitting a secondary synchronization signal (SSS) and a primary synchronization signal (PSS) in a subframe including N (a natural number of N>

1) resource blocks (RBs) and a plurality of orthogonal frequency division multiplexing (OFDM) symbols; and

transmitting a reference signal created based on a cell identifier in the subframe,

wherein the PSS is transmitted in K (a natural number of K<

N) contiguous RBs selected from a plurality of RBs in a sixth OFDM symbol of the subframe,

wherein the SSS is transmitted in K (a natural number of K<

N) contiguous RBs selected from the plurality of RBs in a seventh OFDM symbol of the subframe,

wherein the reference signal is transmitted in M (a natural number of K<

=M<

N) RBs including the K RBs in the remaining OFDM symbols except for the sixth OFDM symbol and the seventh OFDM symbol,

wherein when N is an even number, M is an even number, and

wherein when N is an odd number, M is an odd number.

2. The method of claim 1,

wherein when N is an even number and K is an even number, the reference signal is transmitted in the K RBs,

wherein when N is an even number and K is an odd number, the reference signal is transmitted in the K+1 RBs, and

wherein the K RBs and the K+1 RBs are frequency bands selected based on center RBs among the N RBs.

3. The method of claim 1,

wherein when N is an odd number and K is an odd number, the reference signal is transmitted in the K RBs,

wherein when N is an odd number and K is an even number, the reference signal is transmitted in the K+1 RBs, and

wherein the K RBs and the K+1 RBs are frequency bands selected based on center RBs among the N RBs.

4. A base station for transmitting a reference signal in a wireless communication system, the base station comprising a processor,

wherein the processor is configured to transmit a secondary synchronization signal (SSS) and a primary synchronization signal (PSS) in a subframe including N (a natural number of N>

1) resource blocks (RBs) and a plurality of orthogonal frequency division multiplexing (OFDM) symbols and

transmit a reference signal created based on a cell identifier in the subframe,

wherein the PSS is transmitted in K (a natural number of K<

N) contiguous RBs selected from a plurality of RBs in a sixth OFDM symbol of the subframe,

wherein the SSS is transmitted in K (a natural number of K<

N) contiguous RBs selected from the plurality of RBs in a seventh OFDM symbol of the subframe,

wherein the reference signal is transmitted in M (a natural number of K<

=M<

N) RBs including the K RBs in the remaining OFDM symbols except for the sixth OFDM symbol and the seventh OFDM symbol,

wherein when N is an even number, the M is an even number, and

wherein when N is an odd number, the M is an odd number.

5. The base station of claim 4,

wherein the processor is configured to transmit the reference signal in the K RBs when N is an even number and K is an even number and

transmit the reference signal in the K+1 RBs when N is an even number and K is an odd number,

wherein the K RBs and the K+1 RBs are frequency bands selected based on center RBs among the N RBs.

6. The base station of claim 4,

wherein the processor is configured to transmit the reference signal in the K RBs when N is an odd number and K is an odd number and

transmit the reference signal in the K+1 RBs when N is an odd number and K is an even number,

wherein the K RBs and the K+1 RBs are frequency bands selected based on center RBs among the N RBs.