METHOD AND APPARATUS FOR GENERATING SYNCHRONOUS SIGNAL IN WIRELESS ACCESS SYSTEM FOR SUPPORTING SUPER-HIGH FREQUENCY BAND

• US 20150289220A1
• Filed: 11/05/2013
• Published: 10/08/2015
• Est. Priority Date: 11/05/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jinmin, Kim, Kitae, Ko, Hyunsoo, Chung, Jaehoon
• Granted Patent: US 9,622,202 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2675 Pilot or known symbols
• CPC Class Codes: H04L 27/2692 with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 56/009 Closed loop measurements
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention relates to a method for newly defining a synchronous signal used in a super-high frequency band and acquiring downlink synchronization by using the synchronous signal, and an apparatus for supporting the same. The method for enabling a base station to transmit the synchronous signal in the wireless access system supporting the super-high frequency band, as one embodiment of the present invention, comprises the steps of: generating a general synchronous signal which do not have repetitive characteristics; generating a repetitive synchronous signal on the basis of a repetition factor for estimating a carrier frequency offset of the super-high frequency band; transmitting the general synchronous signal from a first frame; and transmitting the repetitive synchronous signal from a second frame. At this time, the repetition factor indicates the repetitive characteristic of the repetitive synchronous signal.

Claims

1. A method for transmitting a synchronization signal by a Base Station (BS) in a wireless access system supporting a high frequency band, the method comprising:

generating a general synchronization signal without a repetitive characteristic;

generating a repetitive synchronization signal based on a repetition factor used for estimating a Carrier Frequency Offset (CFO) of the high frequency band;

transmitting the general synchronization signal in a first frame; and

transmitting the repetitive synchronization signal in a second frame,

wherein the repetition factor represents a repetitive characteristic of the repetitive synchronization signal.

2. The method according to claim 1, further comprising:

transmitting a message including a repetitive sequence bitmap indicating a position at which the repetitive synchronization signal is transmitted and the repetition factor,

wherein the repetitive sequence bitmap indicates positions of the first and second frames.

3. The method according to claim 1, wherein the repetitive synchronization signal is configured by repeating a sequence included in the repetitive synchronization signal as many times as the repetition factor.

4. A method for receiving a synchronization signal by a User Equipment (UE) in a wireless access system supporting a high frequency band, the method comprising:

receiving a general synchronization signal without a repetitive characteristic in a first frame;

receiving a repetitive synchronization signal transmitted for estimating a Carrier Frequency Offset (CFO) of the high frequency band, in a second frame; and

estimating the CFO of the high frequency band using the general synchronization signal and the repetitive synchronization signal.

5. The method according to claim 4, further comprising:

receiving a message including a repetitive sequence bitmap indicating a position at which the repetitive synchronization signal is transmitted and a repetition factor,

wherein the repetitive sequence bitmap indicates positions of the first and second frames.

6. The method according to claim 4, wherein the repetitive synchronization signal is configured by repeating a sequence included in the repetitive synchronization signal as many times as a repetition factor.

7. A Base Station (BS) for transmitting a synchronization signal in a wireless access system supporting a high frequency band, the BS comprising:

a transmitter; and

a processor configured to generate the synchronization signal,

wherein the processor is configured to generate a general synchronization signal without a repetitive characteristic, to generate a repetitive synchronization signal based on a repetition factor used for estimating a Carrier Frequency Offset (CFO) of the high frequency band, to transmit the general synchronization signal in a first frame through the transmitter, and to transmit the repetitive synchronization signal in a second frame through the transmitter, and

wherein the repetition factor represents a repetitive characteristic of the repetitive synchronization signal.

8. The BS according to claim 7, wherein the processor controls the transmitter to transmit a message including a repetitive sequence bitmap indicating a position at which the repetitive synchronization signal is transmitted and the repetition factor, and

wherein the repetitive sequence bitmap indicates positions of the first and second frames.

9. The BS according to claim 7, wherein the repetitive synchronization signal is configured by repeating a sequence included in the repetitive synchronization signal as many times as the repetition factor.

10. A User Equipment (UE) for receiving a synchronization signal in a wireless access system supporting a high frequency band, the UE comprising:

a receiver; and

a processor configured to estimate a Carrier Frequency Offset (CFO) of the high frequency band,

wherein the processor is configured to receive a general synchronization signal without a repetitive characteristic in a first frame through the receiver, to receive a repetitive synchronization signal transmitted for estimating the CFO of the high frequency band in a second frame through the receiver, and to estimate the CFO of the super-high frequency band using the general synchronization signal and the repetitive synchronization signal.

11. The UE according to claim 10, wherein the processor controls the receiver to receive a message including a repetitive sequence bitmap indicating a position at which the repetitive synchronization signal is transmitted and a repetition factor, and

wherein the repetitive sequence bitmap indicates positions of the first and second frames.

12. The UE according to claim 10, wherein the repetitive synchronization signal is configured by repeating a sequence included in the repetitive synchronization signal as many times as a repetition factor.