RADIO COMMUNICATION SYSTEM AND MOBILE TERMINAL DEVICE

• US 20160073360A1
• Filed: 04/28/2014
• Published: 03/10/2016
• Est. Priority Date: 05/29/2013
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Uchino, Tooru, Takahashi, Hideaki
• Application Number:
  US14/784,046
• Publication Number:
  US 20160073360A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/30 using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

A radio communication system includes a radio base station and a mobile terminal device communicating with the radio base station using carrier aggregation, wherein upon occurrence of a triggering event of sending a power headroom report to the radio base station, the mobile terminal device is configured to determine whether there is a secondary cell that is in the process of activation, and wherein the mobile terminal device is configured to suspend transmission of the power headroom report to the base station for a predetermined time period if there is a secondary cell that is in the process of activation.

Claims

1. A radio communication system comprising:

a radio base station; and

a mobile terminal device communicating with the radio base station using carrier aggregation,

wherein upon occurrence of a triggering event of sending a power headroom report to the radio base station, the mobile terminal device is configured to determine whether there is a secondary cell that is in the process of activation, and

wherein the mobile terminal device is configured to suspend transmission of the power headroom report to the base station for a predetermined time period if there is a secondary cell that is in the process of activation.

2. The radio communication system according to claim 1,

wherein if the activation of the secondary cell is completed before expiration of the predetermined time period, then the mobile terminal device is configured to include a power headroom value of the secondary cell in the power headroom report and transmit the power headroom report to the radio base station.

3. The radio communication system according to claim 2,

wherein if the secondary cell that is in the process of activation has not been completely activated at the expiration of the predetermined time period, the mobile terminal device is configured to transmit the power headroom report without including the power headroom value of the secondary cell.

4. The radio communication system according to claim 1,

wherein the triggering event is activation of a first secondary cell, and

wherein if activation of a second secondary cell that was in the process activation at the time of the activation of the first secondary cell is completed before expiration of the predetermined time period, the mobile terminal device is configured to include a power headroom value of a primary cell to which the mobile terminal device is primarily connected and power headroom values of the first and second secondary cells in the power headroom report and transmit the power headroom report to the radio base station.

5. The radio communication system according to claim 4,

Wherein if the activation of the second secondary cell has not been completed before the expiration of the predetermined time period, the mobile terminal device is configured to transmit the power headroom report to the radio base station upon expiration of the predetermined time period, without including the power headroom value of the second secondary cell.

6. A mobile terminal device comprising:

a trigger event detector configured to monitor whether transmission of a power headroom report has been triggered;

a PHR creator configured to create a power headroom report upon detection of triggering of the power headroom report;

a secondary cell state manager configured to determine whether there is a secondary cell that is in the process of activation when the power headroom report is triggered; and

a transmission timing controller configured to suspend transmission of the power headroom report if there is a secondary cell that is in the process of activation at the time of the triggering of the power headroom report.

7. The mobile terminal device according to claim 6,

wherein if the activation of the secondary cell is completed before expiration of the predetermined time period, then the mobile terminal device is configured to includes a power headroom value of the secondary cell in the power headroom report and transmit the power headroom report to the radio base station.

8. The mobile terminal device according to claim 7,

wherein if the secondary cell that is in the process of activation has not been completely activated at the expiration of the predetermined time period, the mobile terminal device is configured to transmit the power headroom report without including the power headroom value of the secondary cell.

9. The mobile terminal device according to claim 6,

wherein the triggering event detector is configured to detect activation of the first secondary cell as a power headroom report triggering event;

wherein if activation of a second secondary cell that was in the process activation at the time of the activation of the first secondary cell is completed before expiration of the predetermined time period, the mobile terminal device is configured to include a power headroom value of a primary cell to which the mobile terminal device is primarily connected and power headroom values of the first and second secondary cells in the power headroom report and transmit the power headroom report to the radio base station.

10. The mobile terminal device according to claim 9,

Wherein if the activation of the second secondary cell has not been completed before the expiration of the predetermined time period, the mobile terminal device is configured to transmit the power headroom report to the radio base station upon expiration of the predetermined time period, without including the power headroom value of the second secondary cell.