Random access method and signalling method for the same

• US 8,861,473 B2
• Filed: 03/15/2013
• Issued: 10/14/2014
• Est. Priority Date: 09/26/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Noh, Min Seok, Han, Seung Hee, Kwon, Yeong Hyeon, Park, Hyun Hwa, Lee, Hyun Woo, Kim, Dong Cheol
• Primary Examiner(s): Nguyen, Brian D
• Application Number:
  US13/843,182
• Publication Number:
  US 20130215852A1
• Time in Patent Office: 578 Days
• Field of Search: 370/329, 370/335, 370/394, 370/447, 370/470, 370/472
• US Class Current: 370/329
• CPC Class Codes: H04J 13/0059 CAZAC [constant-amplitude and zero auto-correlation]
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• 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

Abstract

A method for generating an iterative sequence and a signal transmission method using the same are disclosed. As the cell size or the distance between a user equipment (UE) and a Node-B increases, the CP is repeated at least one time while the iterative sequence is generated, the CP length and the ZCZ length are adjusted, so that the sequence timing point can be easily detected, orthogonality between sequences is maintained, and the sequences can be clearly distinguished from each other.

Claims

1. A method for a user equipment (UE) to perform a random access to a Node-B, the method comprising:

receiving system information for a format of a preamble sequence consisting of a cyclic prefix (CP) part and a sequence part, wherein the system information indicates one format of a plurality of formats for a length for the CP part and a length for the sequence part; and

transmitting the preamble sequence to the Node-B over a random access channel, the preamble sequence selected based on the indicated format,

wherein the plurality of formats comprises;

a first format for basic lengths of the CP part and the sequence part,

a second format for a case in which only the length of the CP part is increased compared to the first format, and

a third format for a case in which both of the lengths of the CP part and the sequence part are increased compared to the first format.

2. The method of claim 1, wherein the length for the sequence part comprises a ZCZ (Zero Correlation Zone) size indicating a unit of a cyclic shift applied to the preamble sequence.

3. The method of claim 1, wherein at least one of the CP part and the sequence part of the preamble sequence has a repeated structure when at least one of the lengths of the CP part and the sequence part is increased compared to the first format.

4. The method of claim 1, wherein the plurality of formats further comprises:

a fourth format for a case in which one or more of the lengths of the CP part and the sequence part are increased compared to any one of the first to third formats.

5. A user equipment (UE) for performing a random access to a Node-B, the UE comprising:

a receiver configured to receive system information for a preamble sequence consisting of a cyclic prefix (CP) part and a sequence part, wherein the system information indicates one format of a plurality of formats for a length for the CP part and a length for the sequence part; and

a transmitter configured to transmit the preamble sequence to the Node-B over a random access channel, the preamble sequence selected based on the indicated format,

wherein the plurality of formats comprises;

a first format for basic lengths of the CP part and the sequence part,

a second format for a case in which only the length of the CP part is increased compared to the first format, and

a third format for a case in which both of the lengths of the CP part and the sequence part are increased compared to the first format.

6. The UE of claim 5, wherein the length for the sequence part comprises a ZCZ (Zero Correlation Zone) size indicating a unit of a cyclic shift applied to the preamble sequence.

7. The UE of claim 5, wherein at least one of the CP part and the sequence of part the preamble sequence has a repeated structure when at least one of the lengths of the CP part and the sequence part is increased compared to the first format.

8. The UE of claim 5, wherein the plurality of formats further comprises:

a fourth format for a case in which one or more of the lengths of the CP part and the sequence part are increased compared to any one of the first to third formats.