WIRELESS COMMUNICATION SYSTEM, BASE STATION APPARATUS, MOBILE STATION APPARATUS, AND RANDOM ACCESS METHOD

• US 20120172048A1
• Filed: 08/03/2010
• Published: 07/05/2012
• Est. Priority Date: 08/06/2009
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kato, Yasuyuki, Yamada, Shohei, Suzuki, Shoichi
• Granted Patent: US 9,814,067 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A random access instructed by a base station apparatus and having a small delay is enabled in Advanced-EUTRA system. Upon detection of control data in any one of a plurality of component carriers, component carrier information, a preamble number, and random access channel information are extracted from the control data, and if the extracted information indicates dedicated preamble transmission, a random access channel position to be used is selected from information on random access of a component carrier specified in the component carrier information and the random access channel information, a random access preamble is generated from the information on random access and the dedicated preamble number, and the random access preamble is transmitted at the random access channel position.

Claims

1. A wireless communication system in which a base station apparatus allocates a plurality of component carriers to a mobile station apparatus and communicates with said mobile station apparatus, and said mobile station apparatus transmits a random access preamble to a random access channel even during communication with said base station apparatus, wherein

said base station apparatus

selects a component carrier from among component carriers allocated to said mobile station apparatus, a dedicated preamble, and a random access channel to be used for random access preamble transmission among random access channels associated with said component carrier,

prepares control data including information of said selected component carrier, a number of said selected dedicated preamble, and information of said selected random access channel, and

transmits said control data to a mobile station apparatus using any one of said plurality of allocated component carriers;

and wherein

said mobile station apparatus,

when detecting said control data in any one of said plurality of component carriers,

extracts component carrier information, a preamble number, and random access channel information from said control data, and

if said extracted information indicates dedicated preamble transmission,

selects a random access channel position to be used from information on random access of a component carrier specified in said component carrier information and said random access channel information, and generates a random access preamble from said information on random access and said dedicated preamble number, and

transmits said random access preamble at said random access channel position.

2. The wireless communication system according to claim 1, wherein

said base station apparatus

prepares control data indicating random preamble transmission, and transmits said control data to a mobile station apparatus using any one of said plurality of component carriers, and wherein

said mobile station apparatus,

when detecting said control data in any one of said plurality of component carriers,

extracts component carrier information, a preamble number, and random access channel information from said control data, and

if said extracted information indicates random preamble transmission,

said mobile station apparatus selects a component carrier, a random access channel position, and a random preamble to be used, and generates a random access preamble from information on random access of said selected component carrier and said random preamble, and

transmits said random access preamble at said random access channel position.

3. The wireless communication system according to claim 2, wherein at least one of said preamble number, said random access channel information, and said component carrier information in said control data indicating random preamble transmission has a fixed value.

4. The wireless communication system according to claim 3, wherein,

if component carrier information of said control data does not have a fixed value, a random access channel position and a random preamble to be used are selected based on information on random access of a component carrier specified by said component carrier information, and a random access preamble is generated from said information on random access and said random preamble;

and

said random access preamble is transmitted at said random access channel position.

5. A base station apparatus which allocates a plurality of component carriers to a mobile station apparatus and receives a random access preamble from said mobile station apparatus during communication with said mobile station apparatus, wherein

said base station apparatus

selects one of said component carriers allocated to said mobile station apparatus, a dedicated preamble, and a random access channel to be used for random access preamble transmission among random access channels associated with said component carrier,

prepares control data including information of said selected component carrier, a number of said selected dedicated preamble, and information of said selected random access channel, and

transmits said control data to said mobile station apparatus using any one of said plurality of allocated component carriers.

6. The base station apparatus according to claim 5, wherein said base station apparatus prepares control data instructing random preamble transmission, and transmits said control data to said mobile station apparatus using any one of said plurality of component carriers.

7. A mobile station apparatus which has a plurality of component carriers allocated by a base station apparatus and transmits a random access preamble to a random access channel even during communication with a base station apparatus, wherein

said mobile station apparatus,

when detecting control data in any one of said plurality of component carriers,

extracts component carrier information, a preamble number, and random access channel information from said control data, and

if said extracted information indicates dedicated preamble transmission,

selects a random access channel position to be used from information on random access of a component carrier specified in said component carrier information and said random access channel information, and generates a random access preamble from said information on random access and said dedicated preamble number, and

transmits said random access preamble at said random access channel position.

8. The mobile station apparatus according to claim 7, wherein,

if said extracted information indicates random preamble transmission,

said mobile station apparatus

selects a component carrier, a random access channel position, and a random preamble to be used, and generates a random access preamble from said information on random access and said random preamble, and

transmits said random access preamble at said random access channel position.

9. A random access method in which a base station apparatus allocates a plurality of component carriers to a mobile station apparatus and communicates with the mobile station apparatus, and the mobile station apparatus transmits a random access preamble to a random access channel even during communication with the base station apparatus, said method comprising at least the steps of:

in said base station apparatus,

selecting a component carrier from among said component carriers allocated to said mobile station apparatus, a dedicated preamble, and a random access channel to be used for random access preamble transmission among random access channels associated with said component carrier,

preparing control data including information of said selected component carrier, a number of said selected dedicated preamble, and information of said selected random access channel, and transmitting said control data to the mobile station apparatus using any one of said plurality of allocated component carriers, and

in said mobile station apparatus,

when detecting said control data in any one of said plurality of component carriers,

extracting component carrier information, a preamble number, and random access channel information from said control data, and determining whether said extracted information indicates dedicated preamble transmission or random preamble transmission, and

if said extracted information indicates dedicated preamble transmission,

selecting a random access channel position to be used from information on random access of a component carrier specified in said component carrier information and said random access channel information, generating a random access preamble from said information on random access and said dedicated preamble number, and transmitting said random access preamble at said random access channel position.

10. The random access method according to claim 9, further comprising at least the steps of:

in said base station apparatus,

preparing control data indicating random preamble transmission, and transmitting said control data to the mobile station apparatus using any one of said plurality of component carriers, and

in said mobile station apparatus,

when detecting said control data in any one of said plurality of component carriers,

extracting component carrier information, a preamble number, and random access channel information from said control data, and determining whether said extracted information indicates dedicated preamble transmission or random preamble transmission, and

if said extracted information indicates random preamble transmission,

selecting a component carrier, a random access channel position, and a random preamble to be used, generating a random access preamble from said information on random access of said component carrier and said random preamble, and transmitting said random access preamble at said random access channel position.