METHOD AND APPARATUS FOR DETECTING UPLINK SYNCHRONIZATION SIGNAL OF EACH LEVEL IN WIRELESS ACCESS SYSTEM SUPPORTING HIGH-FREQUENCY BAND

• US 20160219621A1
• Filed: 09/05/2014
• Published: 07/28/2016
• Est. Priority Date: 09/08/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Kitae, LEE, Kilbom, CHUNG, Jaehoon, KIM, Jinmin
• Granted Patent: US 9,918,338 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2678 using cyclostationarities, e.g. cyclic prefix or postfix
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/0055 determining timing error of reception due to propagation delay
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side

Abstract

The present invention provides a method for detecting an uplink synchronization signal in a wireless access system supporting a high-frequency band, a method for designing a detection filter for the same and an apparatus for supporting the same. According to one embodiment of the present invention, a method for detecting a random access channel signal by a base station in a wireless access system supporting the high-frequency band comprises: allocating a cyclic shift value used in the base station; configuring a received signal vector for a signal transmitted via a random access channel; detecting at least one RACH signal from the received signal vector, using a frequency domain detecting filter; and identifying at least one terminal having transmitted at least one RACH signal, using a target terminal detecting filter, wherein the filter for detecting a target terminal may be set on the basis of the cyclic shift value.

Claims

1. A method of detecting a random access channel (RACH) signal, which is detected by a base station in a wireless access system supporting a high frequency band, the method comprising:

assigning a cyclic shift value used in the base station;

configuring a reception signal vector in response to signals transmitted on a random access channel;

detecting one or more RACH signals from the reception signal vector using a frequency domain detection filter; and

identifying one or more user equipments (UEs) from which the one or more RACH signals are transmitted using a target UE detection filter,

wherein the target UE detection filter is configured based on the cyclic shift value.

2. The method of claim 1, wherein the frequency domain detection filter G_m is defined as Equation in the following,

G_m=F^Hdiag(Fs⁽⁰⁾)F, 

 

[Equation]

wherein s⁽⁰⁾ corresponds to a first column of a circulant matrix, wherein F corresponds to an N×

N DFT matrix, wherein F^H corresponds to an N×

N IFDT matrix and wherein diag( ) function corresponds to a diagonal matrix.

3. The method of claim 2, wherein the circulant matrix is defined as

4. The method of claim 1, wherein the target UE detection filter corresponds to a diagonal matrix and wherein a matrix element corresponding to the cyclic shift value is represented by ‘

1’

.

5. The method of claim 4, wherein the number of ‘

1’

in the target UE detection filter is identical to a length N_ZC of a zero correlation zone (ZCZ) and wherein the length of the ZCZ is configured in consideration of the number L of valid channels on which the RACH signal is transmitted.

6. A base station detecting a random access channel (RACH) signal in a wireless access system supporting a high frequency band, the base station comprising:

a transmitter;

a receiver; and

a processor configured to control the transmitter and the receiver to detect the RACH signal,

wherein the processor configured to;

assign a cyclic shift value used in the base station, configure a reception signal vector in response to signals transmitted on a random access channel, detect one or more RACH signals from the reception signal vector using a frequency domain detection filter, identify one or more user equipments (UEs) from which the one or more RACH signals are transmitted using a target UE detection filter,

wherein the target UE detection filter is configured based on the cyclic shift value.

7. The base station of claim 6, wherein the frequency domain detection filter G_m is defined as Equation in the following,

G_m=F^Hdiag(Fs⁽⁰⁾)F, 

 

[Equation]

wherein s⁽⁰⁾ corresponds to a first column of a circulant matrix, wherein F corresponds to an N×

N DFT matrix, wherein F^H corresponds to an N×

N IFDT matrix and wherein diag( ) function corresponds to a diagonal matrix.

8. The base station of claim 7, wherein the circulant matrix is defined as

9. The base station of claim 6, wherein the target UE detection filter corresponds to a diagonal matrix and wherein a matrix element corresponding to the cyclic shift value is represented by ‘

1’

.

10. The base station of claim 9, wherein the number of ‘

1’

in the target UE detection filter is identical to a length N_ZC of a zero correlation zone (ZCZ) and wherein the length of the ZCZ is configured in consideration of the number L of valid channels on which the RACH signal is transmitted.