Random access method and signalling method for the same

• US 9,088,993 B2
• Filed: 09/08/2014
• Issued: 07/21/2015
• 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:
  US14/480,356
• Publication Number:
  US 20140376495A1
• Time in Patent Office: 316 Days
• US Class Current: 1/1
• 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 is described for a specific user equipment (UE) to perform a random access to a Node-B within a cell in which a plurality of UEs are located together. The method includes receiving system information for at least one of a basic sequence index and a length of a zero correlation zone (ZCZ) from the Node-B, and transmitting a preamble sequence to the Node-B over a random access channel. The preamble sequence is generated from constant amplitude zero auto-correlation (CAZAC) sequences distinguishable by at least one of the basic sequence index and a length of a cyclic shift (CS) applied to the preamble sequence. The length of the CS applied to the preamble sequence is given by one among a plurality of application lengths determined based on the length of the ZCZ, wherein a number of the plurality of lengths are differently given based on a type of the specific UE, and wherein the system information is the same for all the UEs within the cell regardless of the types of UEs.

Claims

1. A method for a specific user equipment (UE) to perform a random access to a Node-B within a cell in which a plurality of UEs are located together, the method comprising:

receiving system information for at least one of a basic sequence index and a length of a zero correlation zone (ZCZ) from the Node-B; and

transmitting a preamble sequence to the Node-B over a random access channel,

wherein the preamble sequence is generated from constant amplitude zero auto-correlation (CAZAC) sequences distinguishable by at least one of the basic sequence index and a length of a cyclic shift (CS) applied to the preamble sequence, and

wherein the length of the CS applied to the preamble sequence is given by one among a plurality of application lengths determined based on the length of the ZCZ, wherein a number of the plurality of lengths are differently given based on a type of the specific UE, and wherein the system information is the same for all of the UEs within the cell regardless of the types of UEs.

2. The method of claim 1, wherein the types of the UEs are based on a location of each UE within the cell.

3. The method of claim 1, wherein the length of the CS applied to the preamble sequence is given one among all lengths corresponding to a multiple of the length of the ZCZ within a limit of a length of the preamble sequence, when the type of the specific UE is a first type.

4. The method of claim 1, wherein the length of the CS applied to the preamble sequence is given one among a part of all lengths corresponding to a multiple of the length of the ZCZ within a limit of a length of the preamble sequence, when the type of the specific UE is a second type.

5. The method of claim 1, wherein the system information received from the Node-B is received over a broadcast channel (BCH).

6. A user equipment (UE) device for performing a random access to a Node-B within a cell in which a plurality of UEs are located together, the UE device comprising:

a receiver for receiving system information for at least one of a basic sequence index and a length of a zero correlation zone (ZCZ) from the Node-B; and

a transmitter for transmitting a preamble sequence to the Node-B over a random access channel,

wherein the preamble sequence is generated from constant amplitude zero auto-correlation (CAZAC) sequences distinguishable by at least one of the basic sequence index and a length of a cyclic shift (CS) applied to the preamble sequence, and

wherein the length of the CS applied to the preamble sequence is given by one among a plurality of applicable lengths determined based on the length of the ZCZ, wherein a number of the plurality of applicable lengths are differently given based on a type of the UE device, and wherein the system information is the same for all the UEs within the cell regardless of the types of UEs.

7. The UE device of claim 6, wherein the types of the UEs are based on a location of each UE within the cell.

8. The UE device of claim 6, wherein the length of the CS applied to the preamble sequence is given one among all lengths corresponding to a multiple of the length of the ZCZ within a limit of a length of the preamble sequence, when the type of the specific UE is a first type.

9. The UE device of claim 6, wherein the length of the CS applied to the preamble sequence is given one among a part of all lengths corresponding to a multiple of the length of the ZCZ within a limit of a length of the preamble sequence, when the type of the specific UE is a second type.