METHOD FOR PERFORMING HIGH-SPEED INITIAL ACCESS PROCESS IN WIRELESS ACCESS SYSTEM SUPPORTING ULTRAHIGH FREQUENCY BAND, AND DEVICE SUPPORTING SAME

• US 20150359003A1
• Filed: 11/12/2013
• Published: 12/10/2015
• Est. Priority Date: 01/28/2013
• 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 9,814,076 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access
• CPC Class Codes: H04W 74/0891 for synchronized access

Abstract

The present invention provides a method for performing an initial access process used in a wireless access system and in an ultrahigh frequency band, and devices supporting same. The method for performing a high-speed initial access process in a wireless access system supporting an ultrahigh frequency band, according to one embodiment of the present invention, may comprise the steps of: receiving a synchronizing signal; receiving a broadcast channel signal; generating a random access preamble by using pre-fixed physical random access parameters according to a small cell supported in the ultrahigh frequency band; and transmitting the generated random access preamble on the basis of the synchronizing signal and the broadcast channel signal.

Claims

1. A method for performing a fast initial access procedure in a wireless access system supporting an ultrahigh frequency band, the method comprising:

receiving a synchronization signal;

receiving a broadcast channel signal;

generating a Random Access Channel (RACH) preamble using prefixed Physical Random Access Channel (PRACH) parameters according to a small cell supported in the ultrahigh frequency band; and

transmitting the generated RACH preamble based on the synchronization signal and the broadcast channel signal.

2. The method according to claim 1,

wherein the PRACH parameters include one or more of a PRACH configuration index parameter indicating a PRACH configuration and an RACH preamble format, a PRACH frequency offset parameter indicating a frequency position at which the RACH preamble is to be transmitted, a root sequence index parameter indicating a root Zadoff Chu (ZC) sequence, a Zero Correlation Zone (ZCZ) configuration parameter indicating a cyclic shift value, and a fast flag parameter indicating whether cyclic shifts are selected from a restricted set or an unrestricted set.

3. The method according to claim 1,

wherein cyclic shift values used to generate the RACH preamble are selected from only an unrestricted set.

4. A method for performing a fast initial access procedure in a wireless access system supporting an ultrahigh frequency band, the method comprising:

receiving a synchronization signal;

receiving a broadcast channel signal including one or more Physical Random Access Channel (PRACH) parameters configured to be used in the ultrahigh frequency band;

generating a Radom Access Channel (RACH) preamble using the synchronization signal and the broadcast channel signal; and

transmitting the generated RACH preamble.

5. The method according to claim 4, wherein the one or more PRACH parameters include at least one of a PRACH configuration index parameter indicating a PRACH configuration and an RACH preamble format, a PRACH frequency offset parameter indicating a frequency position at which the RACH preamble is to be transmitted, a root sequence index parameter indicating a root Zadoff Chu (ZC) sequence, a Zero Correlation Zone (ZCZ) configuration parameter indicating a cyclic shift value, and a fast flag parameter indicating whether cyclic shifts are selected from a restricted set or an unrestricted set.

6. The method according to claim 5,

wherein the one or more PRACH parameters are mapped to reserved bits except for a master information block in the broadcast channel signal and then transmitted.

7. The method according to claim 5,

wherein the PRACH frequency offset parameter is obtained using a cell identifier detected from the synchronization signal.

8. The method according to claim 5,

wherein the root sequence index parameter and a Zero Correlation Zone (ZCZ) configuration parameter are obtained from a root index of the synchronization signal.

9. A User Equipment (UE) for performing a fast initial access procedure in a wireless access system supporting an ultrahigh frequency band, the UE comprising:

a receiver;

a transmitter; and

a processor configured to perform the fast initial access procedure performed in the ultrahigh frequency band,

wherein the processor is configured to

receive a synchronization signal and a broadcast channel signal through the receiver,

generate a Random Access Channel (RACH) preamble using prefixed Physical Random Access Channel (PRACH) parameters according to a small cell supported in the ultrahigh frequency band, and

transmit the generated RACH preamble based on the synchronization signal and the broadcast channel signal through the transmitter.

10. The UE according to claim 9,

wherein the PRACH parameters include one or more of a PRACH configuration index parameter indicating a PRACH configuration and an RACH preamble format, a PRACH frequency offset parameter indicating a frequency position at which the RACH preamble is to be transmitted, a root sequence index parameter indicating a root Zadoff Chu (ZC) sequence, a Zero Correlation Zone (ZCZ) configuration parameter indicating a cyclic shift value, and a fast flag parameter indicating whether cyclic shifts are selected from a restricted set or an unrestricted set.

11. A User Equipment (UE) for performing a fast initial access procedure in a wireless access system supporting an ultrahigh frequency band, the UE comprising:

a receiver;

a transmitter; and

a processor configured to perform the fast initial access procedure performed in the ultrahigh frequency band,

wherein the processor is configured to

receive a synchronization signal, and a broadcast channel signal including one or more Physical Random Access Channel (PRACH) parameters configured to be used in the ultrahigh frequency band, through the receiver,

generate a Radom Access Channel (RACH) preamble using the synchronization signal and the broadcast channel signal, and

transmit the generated RACH preamble through the transmitter.

12. The UE according to claim 11, wherein the one or more PRACH parameters include at least one of a PRACH configuration index parameter indicating a PRACH configuration and an RACH preamble format, a PRACH frequency offset parameter indicating a frequency position at which the RACH preamble is to be transmitted, a root sequence index parameter indicating a root Zadoff Chu (ZC) sequence, a Zero Correlation Zone (ZCZ) configuration parameter indicating a cyclic shift value, and a fast flag parameter indicating whether cyclic shifts are selected from a restricted set or an unrestricted set.

13. The UE according to claim 12,

wherein the one or more PRACH parameters are mapped to spare bits except for a master information block in the broadcast channel signal and then transmitted.

14. The UE according to claim 12,

wherein the PRACH frequency offset parameter is obtained using a cell identifier detected from the synchronization signal.

15. The UE according to claim 12,

wherein the root sequence index parameter and a Zero Correlation Zone (ZCZ) configuration parameter are obtained from a root index of the synchronization signal.