Radio communication system and method

• US 8,369,286 B2
• Filed: 09/25/2008
• Issued: 02/05/2013
• Est. Priority Date: 09/26/2007
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Hamabe, Kojiro, Lee, Jinsock
• Primary Examiner(s): Nguyen, Brian D
• Application Number:
  US12/680,144
• Publication Number:
  US 20100208707A1
• Time in Patent Office: 1,594 Days
• Field of Search: 370/252, 370/331, 370/332, 455/67.11, 455/436
• US Class Current: 370/332
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/0016 Hand-off preparation specially adapted for end-to-end data sessions
• CPC Class Codes: H04W 36/0094 Definition of hand-off measurement parameters
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A mobile station determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status and/or on/off of the predetermined measurement and controls execution of the predetermined measurement based on the determination.

Claims

1. A mobile terminal comprising:

a unit that determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

a unit that controls execution of the predetermined measurement based on the determination,

wherein the mobile terminal measures reception quality of a pilot signal from a base station in a single cell in a first measurement cycle, and if, as a result of the measurement, the pilot signal reception quality falls below a predetermined first threshold and exceeds a predetermined second threshold, the mobile terminal measures reception quality of a pilot signal from a base station in another cell in a second measurement cycle.

2. The mobile terminal according to claim 1, wherein, in case, as a result of the measurement of the reception quality of the pilot signal from the base station in the single cell, the reception quality of the pilot signal from the base station in the single cell is less than or equal to the second threshold, the mobile terminal measures reception quality of a pilot signal from a base station in another cell in a third measurement cycle, and wherein,

in case the reception quality of the pilot signal from the base station in the single cell is greater than or equal to the first threshold, the mobile terminal does not measure reception quality of a pilot signal from a base station in another cell.

3. A mobile terminal comprising:

a unit that determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

a unit that controls execution of the predetermined measurement based on the determination,

wherein, when reception quality of a pilot signal from a base station is less than or equal to a predetermined threshold, the mobile terminal starts a measurement report management timer arranged therein,

wherein, when the pilot signal reception quality exceeds the predetermined threshold, the mobile terminal stops the measurement operation of the timer as long as the pilot signal reception quality is above the predetermined threshold,

wherein, when the pilot signal reception quality falls below the predetermined threshold, the mobile terminal resumes the measurement operation of the timer, and

wherein, when a time-out of the timer occurs, the mobile terminal records a report on the predetermined measurement.

4. A mobile terminal comprising:

a unit that determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

a unit that controls execution of the predetermined measurement based on the determination,

wherein, when reception quality of a pilot signal from the base station is less than or equal to a predetermined threshold, the mobile terminal starts a first timer arranged therein and used to manage measurement reports, and

wherein, when the pilot signal reception quality is below a predetermined threshold and a time-out of the first timer occurs, the mobile terminal records a report on the predetermined measurement, starts a second timer arranged therein, and prohibits execution of the predetermined measurement during the measurement operation of the second timer.

5. A mobile terminal comprising:

a unit that determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

a unit that controls execution of the predetermined measurement based on the determination,

wherein, when reception quality of a pilot signal from the base station is less than or equal to a predetermined threshold, the mobile terminal starts a first timer arranged therein and used to manage measurement reports, and

wherein, when reception quality of the pilot signal exceeds the predetermined threshold, the mobile terminal stops the first timer, starts a second timer for resetting, and resets the first timer when a time-out of the second timer occurs.

6. A mobile terminal comprising:

a unit that determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

a unit that controls execution of the predetermined measurement based on the determination,

wherein, when radio quality of a single cell becomes less than or equal to a predetermined threshold, the mobile terminal starts a timer arranged therein and periodically measures radio quality of a cell neighboring to the single cell,

wherein, when radio quality of the single cell exceeds the predetermined threshold, as long as the radio quality of the single cell is above the predetermined threshold, the mobile terminal stops the measurement operation of the timer and the periodic measurement of the radio quality of the neighbor cell,

wherein, when radio quality of the single cell becomes less than or equal to the predetermined threshold, the mobile terminal resumes the measurement operation of the timer, and

wherein, when a time-out of the timer occurs, the mobile terminal records a measurement report.

7. A mobile terminal comprising:

a unit that determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

a unit that controls execution of the predetermined measurement based on the determination,

wherein, when radio quality of a single cell becomes less than or equal to a predetermined threshold, the mobile terminal starts a first timer arranged therein and periodically measures radio quality of a cell neighboring to the single cell, and

wherein, when radio quality of the single cell is less than or equal to the predetermined threshold and a time-out of the first timer occurs, the mobile terminal records a report about the measurement, starts a second timer arranged therein, and prohibits the measurement during the measurement operation of the second timer.

8. A mobile terminal comprising:

a unit that determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

a unit that controls execution of the predetermined measurement based on the determination,

wherein, when radio quality of a single cell becomes less than or equal to a predetermined threshold, the mobile terminal starts a first timer arranged therein and periodically measures radio quality of a cell neighboring to the single cell,

wherein, when radio quality of the single cell exceeds the predetermined threshold, the mobile terminal stops the first timer and starts a second timer arranged therein, and

wherein, when the second timer times out, while the first timer is stopped and the radio quality is above the predetermined threshold, the mobile terminal resets the first timer.

9. A mobile terminal comprising:

a unit that determines, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

a unit that controls execution of the predetermined measurement based on the determination,

wherein, when radio quality of a handover source cell becomes less than or equal to a predetermined threshold during a handover, the mobile terminal starts a measurement report management timer arranged therein, and upon completion of the handover, the mobile terminal stops the timer.

10. A radio communication method comprising:

a mobile terminal determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

the mobile terminal controlling execution of the predetermined measurement based on the determination,

wherein, when radio quality of a single cell becomes less than or equal to a predetermined threshold, the mobile terminal starts a timer arranged therein and periodically measures radio quality of a cell neighboring to the single cell,

wherein, when radio quality of the single cell exceeds the predetermined threshold, as long as the radio quality of the single cell is above the predetermined threshold, the mobile terminal stops the measurement operation of the timer and the periodic measurement of the radio quality of the neighbor cell,

wherein, when radio quality of the single cell becomes less than or equal to the predetermined threshold, the mobile terminal resumes the measurement operation of the timer, and

wherein, when a time-out of the timer occurs, the mobile terminal records a measurement report.

11. A radio communication method comprising:

a mobile terminal determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

the mobile terminal controlling execution of the predetermined measurement based on the determination,

wherein, when radio quality of a single cell becomes less than or equal to a predetermined threshold, the mobile terminal starts a first timer arranged therein and periodically measures radio quality of a cell neighboring to the single cell, and

wherein, when radio quality of the single cell is less than or equal to the predetermined threshold and a time-out of the first timer occurs, the mobile terminal records a report about the measurement, starts a second timer arranged therein, and prohibits the measurement during the measurement operation of the second timer.

12. A radio communication method comprising:

a mobile terminal determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

the mobile terminal controlling execution of the predetermined measurement based on the determination,

wherein, when radio quality of a single cell becomes less than or equal to a predetermined threshold, the mobile terminal starts a first timer arranged therein and periodically measures radio quality of a cell neighboring to the single cell,

wherein, when radio quality of the single cell exceeds the predetermined threshold, the mobile terminal stops the first timer and starts a second timer arranged therein, and

wherein, when the second timer times out while the first timer is stopped and the radio quality is above the predetermined threshold, the mobile terminal resets the first timer.

13. A radio communication method comprising:

a mobile terminal determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

the mobile terminal controlling execution of the predetermined measurement based on the determination,

wherein, when radio quality of a handover source cell becomes less than or equal to a predetermined threshold during a handover, the mobile terminal starts a measurement report management timer arranged therein, and upon completion of the handover, the mobile terminal stops the timer.

14. A radio communication method comprising:

a mobile terminal determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

the mobile terminal controlling execution of the predetermined measurement based on the determination,

wherein, when reception quality of an MBSFN (Multicast Broadcast Single Frequency Network) is less than or equal to a predetermined first threshold, the mobile terminal starts a first timer arranged therein and used to manage measurement reports and periodically measures reception quality of the MBSFN,

wherein, when a time-out of the first timer occurs, the mobile terminal sends a measurement report to a base station or records a measurement report therein and starts a second timer arranged therein and used to manage measurement prohibition, and

wherein, when a time-out of the second timer occurs, the mobile terminal starts the first timer and periodically measures reception quality of the MBSFN.

15. The radio communication method according to claim 14, wherein, at the time of a time-out of the first timer, which is started when a time-out of the second timer occurs, the mobile terminal sends a report about the measurement to a base station or records a report about the measurement therein and starts the second timer,

wherein, when a time-out of the second timer occurs, the mobile terminal starts a third timer arranged therein and periodically measures reception quality of the MBSFN based on the third timer, and

wherein, when reception quality of the MBSFN is below a predetermined second threshold and a time-out of the third timer occurs, the mobile terminal starts the second timer.

16. The radio communication method according to claim 15, wherein, when a time-out of the first to third timers occurs, the first and second thresholds are transmitted to the mobile terminal via MCCH as part of control information for corresponding MCCH (MBMS (Multimedia Broadcast/Multicast Service) Control CHannel) transmission.

17. A non-transitory computer-readable recording medium storing a program causing a computer included in a mobile terminal to execute processing comprising:

determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

controlling execution of the predetermined measurement based on the determination, further including a program causing the computer to execute processing comprising;

starting, when radio quality of a single cell becomes less than or equal to a predetermined threshold, a timer arranged in the mobile terminal and periodically measuring radio quality of a cell neighboring to the single cell;

stopping, when radio quality of the single cell exceeds the predetermined threshold, the measurement operation of the timer and the periodic measurement of the radio quality of the neighbor cell, as long as the radio quality of the single cell is above the predetermined threshold;

resuming, when radio quality of the single cell becomes less than or equal to the predetermined threshold, the measurement operation of the timer; and

recording a measurement report when a time-out of the timer occurs.

18. A non-transitory computer-readable recording medium storing a program causing a computer included in a mobile terminal to execute processing comprising:

determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

controlling execution of the predetermined measurement based on the determination,

further including a program causing the computer to execute processing comprising;

starting, when radio quality of a single cell becomes less than or equal to a predetermined threshold, a first timer arranged in the mobile terminal and periodically measuring radio quality of a cell neighboring to the single cell;

recording, when radio quality of the single cell is less than or equal to the predetermined threshold and a time-out of the first timer occurs, a report about the measurement and starting a second timer arranged in the mobile terminal; and

prohibiting the measurement during the measurement operation of the second timer.

19. A non-transitory computer-readable recording medium storing a program causing a computer included in a mobile terminal to execute processing comprising:

determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

controlling execution of the predetermined measurement based on the determination,

further including a program causing the computer to execute processing comprising;

starting, when radio quality of a single cell becomes less than or equal to a predetermined threshold, a first timer arranged in the mobile terminal and periodically measuring radio quality of a cell neighboring to the single cell;

stopping, when radio quality of the single cell exceeds the predetermined threshold, the first timer and starting a second timer arranged in the mobile terminal; and

resetting the first timer when the second timer times out while the first timer is stopped and the radio quality is above the predetermined threshold.

20. A non-transitory computer-readable recording medium storing a program causing a computer included in a mobile terminal to execute processing comprising:

determining, in accordance with reception quality of a radio signal from a base station, a measurement cycle of a predetermined measurement on a link status performed by the mobile terminal and different from a measurement of the radio signal and/or on/off of the predetermined measurement; and

controlling execution of the predetermined measurement based on the determination,

further including a program causing the computer to execute processing comprising;

starting, when radio quality of a handover source cell becomes less than or equal to a predetermined threshold during a handover, a measurement report management timer arranged in the mobile terminal; and

stopping the timer upon completion of the handover.