# US 9,520,969 B2 · Mobile communication system, radio base station, and mobile station

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- Number: US 9,520,969 B2
- Document ID: US9520969B2
- Status: Granted
- Kind: B2
- Application number: 13/521,074
- Filed: 2011-01-07
- Published: 2012-12-27
- Granted: 2016-12-13
- Earliest claimed: 2010-01-08
- Assignees: Ntt Docomo, Inc.
- Applicants: Mikio Iwamura; Anil Umesh
- Inventors: Mikio Iwamura; Anil Umesh
- Web page: https://patentgrep.com/patent/US9520969B2

## CPC

- H04L 5/001: {the frequencies being arranged in component carriers}
- H04W 56/0045: {compensating for timing error by altering transmission time}
- H04W 72/04: Wireless resource allocation
- H04W 72/00: Local resource management
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present invention is a mobile communication system having a mobile station UE, in which CA is performed, configured to transmit an uplink data signal to a radio base station eNB, by using a plurality of “Component Carriers” having different carrier frequencies, and the mobile communication system includes TA timer management units 13 and 23 configured to manage the TA timer corresponding to the plurality of “Component Carriers”; and state management units 14 and 24 configured to manage the state of the plurality of “Component Carriers”, and the state management units 14 and 24 are configured to set the state of a “Component Carrier”, whose TA timer has expired, to an asynchronous state.

## Claims

### Claim 1

A mobile communication system having a mobile station configured to transmit an uplink signal to a radio base station by using a plurality of carriers having different carrier frequencies, comprising:
a timer management circuitry configured to manage a Timing Advance (TA) timer corresponding to the plurality of carriers; and
a state management circuitry configured to manage a state of each of the plurality of carriers, wherein
the state management circuitry is configured to set the state of each of the plurality of carriers, whose TA timer has expired, to an asynchronous state, and
the mobile station is configured to transmit a Random Access Channel (RACH) Preamble in the carrier, when the carrier specified by a Carrier Indicator Field (CIF), the CIF being transmitted via a Physical Downlink Control Channel (PDCCH) from the radio base station, is in an asynchronous state,
wherein the mobile communication system is configured for the plurality of carriers having different carrier frequencies from the radio base station.

### Claim 2

A mobile station configured to transmit an uplink signal to a radio base station by using a plurality of carriers having different carrier frequencies, comprising:
a timer management circuitry configured to manage a Timing Advance (TA) timer corresponding to the plurality of carriers; and
a state management circuitry configured to manage a state of each of the plurality of carriers, wherein
the state management circuitry is configured to set the state of each of the plurality of carriers, whose TA timer has expired, to an asynchronous state, and
a transmission circuitry configured to transmit a Random Access Channel (RACH) Preamble in the carrier, when the carrier specified by a Carrier Indicator Field (CIF), the CIF being transmitted via a Physical Downlink Control Channel (PDCCH) from the radio base station, is in an asynchronous state, is provided,
wherein the plurality of carriers having different carrier frequencies is from the radio base station.