User equipment and method for receiving synchronization signals, and base station and method for transmitting synchronization signals

Patent metadata

Field	Value
Publication number	US-9497719-B2
Application number	US-201314375095-A
Country	US
Kind code	B2
Filing date	Jan 29, 2013
Priority date	Jan 29, 2012
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

The present invention relates to a new type of carrier wave having a different configuration from existing carrier waves. The new type of carrier wave is detected by using at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). When the new type of carrier wave is formed for detection by using only one of the PSS or the SSS, or by using both of the PSS and SSS, the new type of carrier wave includes PSS and SSS transmissions which are different from existing PSS and SSS transmissions.

First claim

The invention claimed is:

1. A method for receiving a synchronization signal by a user equipment, the method comprising:
detecting a first primary synchronization signal (PSS) and a first secondary synchronization signal (SSS) in a subframe #n;
detecting a second PSS and a second SSS in a subframe #n+5;
acquiring synchronization with a cell carrying the first and second PSSs and

the first and second SSSs based on the first and second PSSs and the first and second SSSs,
wherein the first PSS is located on an OFDM symbol #m−1 among OFDM symbols #0 to #m−1 of an even-numbered slot of the subframe #n, the first SSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n, the second PSS is located on an OFDM symbol #m−1 among OFDM symbols #0 to #m−1 of an even-numbered slot of the subframe #n+5 and the second SSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n+5, when the cell is a legacy type cell, and
wherein at least the first PSS or second PSS is located on an OFDM symbol other than the OFDM symbol #m−1 of the even-numbered slot in the subframe #n or #n+5 and at least the first or second SSS is located on another OFDM symbol other than the OFDM symbol #m−2 of the even-numbered slot in the subframe #n or #n+5, when the cell is a new type cell.

2. The method according to claim 1 , wherein the first and second PSSs and the first and second SSSs are located on 6 center resource blocks in a frequency domain, when the cell is the legacy type cell, and
the first and second PSSs and the first and second SSSs are located on 6 resource blocks other than the 6 center resource blocks in the frequency domain, when the cell is the new type cell.

3. The method according to claim 1 , wherein the first PSS is located on one of OFDM symbols #1 and #2 among OFDM symbols #0 to #m−1 of an odd-numbered slot of the subframe #n, the first SSS is located on another one of the OFDM symbols #1 and #2 of the odd-numbered slot of the subframe #n, the second PSS is located on one of OFDM symbols #1 and #2 among OFDM symbols #0 to #m−1 of an odd-numbered slot of the subframe #n+5 and the first SSS is located on another one of the OFDM symbols #1 and #2 of the odd-numbered slot of the subframe #n+5, when the cell is the new type carrier and a duplex mode of the cell is frequency division duplex.

4. The method according to claim 1 , wherein, when the cell is the new type cell, the first PSS is located on the OFDM symbol #m−1 of the even-numbered slot of the subframe #n, the first SSS is located on the OFDM symbol #m−2 of the even-numbered slot of the subframe #n, the second PSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n+5 and the second SSS is located on the OFDM symbol #m−1 of the even-numbered slot of the subframe #n+5, when the cell is the legacy type cell.

5. The method according to claim 1 , wherein, when the cell is the new type cell, the first PSS is located on the OFDM symbol #m−2 of the even-numbered slot of the subframe #n, the first SSS is located on the OFDM symbol #m−1 of the even-numbered slot of the subframe #n, the second PSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n+5 and the second SSS is located on the OFDM symbol #m−1 of the even-numbered slot of the subframe #n+5, when the cell is the legacy type cell.

6. A user equipment for receiving a synchronization signal, the user equipment comprising:
a radio frequency unit; and
a processor configured to control the radio frequency unit, the processor configured to:
detect a first primary synchronization signal (PSS) and a first secondary synchronization signal (SSS) in a subframe #n;
detect a second PSS and a second SSS in a subframe #n+5;
acquire synchronization with a cell carrying the first and second PSSs and the first and second SSSs based on the first and second PSSs and the first and second SSSs,
wherein the first PSS is located on an OFDM symbol #m−1 among OFDM symbols #0 to #m−1 of an even-numbered slot of the subframe #n, the first SSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n, the second PSS is located on an OFDM symbol #m−1 among OFDM symbols #0 to #m−1 of an even-numbered slot of the subframe #n+5 and the second SSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n+5, when the cell is a legacy type cell, and
wherein at least the first PSS or second PSS is located on an OFDM symbol other than the OFDM symbol #m−1 of the even-numbered slot in the subframe #n or #n+5 and at least the first or second SSS is located on another OFDM symbol other than the OFDM symbol #m−2 of the even-numbered slot in the subframe #n or #n+5, when the cell is a new type cell.

7. The user equipment according to claim 6 , wherein the first and second PSSs and the first and second SSSs are located on 6 center resource blocks in a frequency domain, when the cell is the legacy type cell, and
the first and second PSSs and the first and second SSSs are located on 6 resource blocks other than the 6 center resource blocks in the frequency domain, when the cell is the new type cell.

8. The user equipment according to claim 6 , wherein the first PSS is located on one of OFDM symbols #1 and #2 among OFDM symbols #0 to #m−1 of an odd-numbered slot of the subframe #n, the first SSS is located on another one of the OFDM symbols #1 and #2 of the odd-numbered slot of the subframe #n, the second PSS is located on one of OFDM symbols #1 and #2 among OFDM symbols #0 to #m−1 of an odd-numbered slot of the subframe #n+5 and the first SSS is located on another one of the OFDM symbols #1 and #2 of the odd-numbered slot of the subframe #n+5, when the cell is the new type carrier and a duplex mode of the cell is frequency division duplex.

9. The user equipment according to claim 6 , wherein, when the cell is the new type cell, the first PSS is located on the OFDM symbol #m−1 of the even-numbered slot of the subframe #n, the first SSS is located on the OFDM symbol #m−2 of the even-numbered slot of the subframe #n, the second PSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n+5 and the second SSS is located on the OFDM symbol #m−1 of the even-numbered slot of the subframe #n+5, when the cell is the legacy type cell.

10. The user equipment according to claim 6 , wherein, when the cell is the new type cell, the first PSS is located on the OFDM symbol #m−2 of the even-numbered slot of the subframe #n, the first SSS is located on the OFDM symbol #m−1 of the even-numbered slot of the subframe #n, the second PSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n+5 and the second SSS is located on the OFDM symbol #m−1 of the even-numbered slot of the subframe #n+5, when the cell is the legacy type cell.

11. A method for transmitting a synchronization signal by a base station, the method comprising:
transmitting a first primary synchronization signal (PSS) and a first secondary synchronization signal (SSS) in a subframe #n through a cell; and
transmitting a second PSS and a second SSS in a subframe #n+5 through the cell,
wherein the first PSS is located on an OFDM symbol #m−1 among OFDM symbols #0 to #m−1 of an even-numbered slot of the subframe #n, the first SSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n, the second PSS is located on an OFDM symbol #m−1 among OFDM symbols #0 to #m−1 of an even-numbered slot of the subframe #n+5 and the second SSS is located on an OFDM symbol #m−2 of the even-numbered slot of the subframe #n+5, when the cell is a legacy type cell, and
at least the first PSS or second PSS is located on

Assignees

• Lg Electronics Inc

Inventors

• You Hyangsun
• Seo Dongyoun
• Yi Yunjung
• Ahn Joonkui
• Yang Suckchel

Classifications

• H04W56/0015

  one node acting as a reference for the others · CPC title

• H04J11/0073 Primary

  Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group · CPC title

• H04B7/2656

  for structure of frame, burst · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title

• H04J11/0076

  Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group · CPC title