USER APPARATUS AND MOBILE COMMUNICATION METHOD

• US 20110319119A1
• Filed: 12/25/2009
• Published: 12/29/2011
• Est. Priority Date: 12/26/2008
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Ishii, Hiroyuki
• Application Number:
  US13/142,337
• Publication Number:
  US 20110319119A1
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0039 Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
• CPC Class Codes: H04L 5/0066 Requirements on out-of-channel emissions
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A user apparatus (100_n) according to the present invention includes: a maximum transmission power control unit (1083) configured to receive a control signal designating a frequency band in a downlink; and to control a maximum transmission power in a predetermined channel of an uplink; wherein the maximum transmission power control unit (1083) is configured to determine whether or not to decrease the maximum transmission power in a predetermined channel from a rated power regulated in the mobile communication system, according to the frequency band designated by the control signal.

Claims

1. Apparatus that performs a radio communication with a base station apparatus within a mobile communication system, comprising:

a reception unit configured to receive a control signal designating a frequency band in a downlink; and

a maximum transmission power control unit configured to control a maximum transmission power in a predetermined channel of an uplink;

wherein

the maximum transmission power control unit is configured to determine whether or not to decrease the maximum transmission power in a predetermined channel from a rated power regulated in the mobile communication system, according to the frequency band designated by the control signal.

2. The user apparatus according to claim 1, wherein

the maximum transmission power control unit is configured not to decrease the maximum transmission power in a predetermined channel from the rated power, when the control signal does not designate a predetermined frequency band;

and

the maximum transmission power control unit is configured to decrease the maximum transmission power in a predetermined channel by a first value from the rated power, when the control signal designates the predetermined frequency band.

3. The user apparatus according to claim 1, wherein

the maximum transmission power control unit is configured not to decrease the maximum transmission power in a predetermined channel from the rated power, when the control signal does not designate a predetermined frequency band;

and

the maximum transmission power control unit is configured to decrease the maximum transmission power in a predetermined channel, by a first value determined based on at least one of the size of a frequency resource, a modulation scheme and a location of the frequency resource used in the predetermined channel, from the rated power, when the control signal designates the predetermined frequency band.

4. The user apparatus according to claim 1, wherein

the maximum transmission power control unit is configured to decrease the maximum transmission power in a predetermined channel, by a second value corresponding to a combination between a modulation scheme and the size of a frequency resource used in the predetermined channel, from the rated power, when the control signal does not designate a predetermined frequency band;

and

the maximum transmission power control unit is configured to decrease the maximum transmission power in a predetermined channel by a first value and a second value corresponding to a combination between a modulation scheme and the size of a frequency resource used in the predetermined channel, from the rated power, when the control signal designates the predetermined frequency band.

5. The user apparatus according to claim 1, wherein

the maximum transmission power control unit is configured to decrease the maximum transmission power in a predetermined channel, by a second value corresponding to a combination between a modulation scheme and the size of a frequency resource used in the predetermined channel, from the rated power, when the control signal does not designate a predetermined frequency band;

and

the maximum transmission power control unit is configured to decrease the maximum transmission power in the predetermined channel, by a first value determined based on at least one of a frequency bandwidth, a modulation scheme, a location of a frequency resource and a system bandwidth used in the predetermined channel, and a second value corresponding to a combination between the modulation scheme and the size of the frequency resource used in the predetermined channel, from the rated power, when the control signal designates the predetermined frequency band.

6. The user apparatus according to claim 1, wherein

the control signal is configured to be transmitted by using any one of a broadcast channel, an RRC message at the time of a start of communication, an RRC message in a handover, and an NAS message at the time of location registration.

7. The user apparatus according to claim 1, wherein

the predetermined channel is at least one of an uplink shared channel, an uplink control channel, a sounding reference signal for uplink, a demodulation reference signal for uplink, and an uplink random access channel.

8. The user apparatus according to claim 1, wherein

the maximum transmission power control unit is configured to decrease the maximum transmission power in a predetermined channel from the rated power, so that an amount of interference to a previously determined frequency band is equal to or less than a predetermined threshold value, when the control signal designates a predetermined frequency band.

9. The user apparatus according to claim 8, wherein

that the amount of interference to the previously determined frequency band is equal to or less than the predetermined threshold value indicates that a relative value of the interference power to a frequency band adjacent to the frequency band used in the predetermined channel for the transmission power in the predetermined channel is equal to or less than the first threshold value.

10. The user apparatus according to claim 8, wherein

that the amount of interference amount to the previously determined frequency band is equal to or less than the predetermined threshold value indicates that an absolute value of the amount of interference to the previously determined frequency band is equal to or less than the second threshold value.

11. The user apparatus according to claim 1, wherein

the maximum transmission power control unit is configured to determine whether or not to decrease the maximum transmission power in a predetermined channel from the rated power regulated in the mobile communication system, according to whether or not the frequency band is a frequency band used only in a predetermined region.

13. The user apparatus according to claim 2, wherein

the control signal is configured to be transmitted by using any one of a broadcast channel, an RRC message at the time of a start of communication, an RRC message in a handover, and an NAS message at the time of location registration.

14. The user apparatus according to claim 3, wherein

the control signal is configured to be transmitted by using any one of a broadcast channel, an RRC message at the time of a start of communication, an RRC message in a handover, and an NAS message at the time of location registration.

15. The user apparatus according to claim 4, wherein

the control signal is configured to be transmitted by using any one of a broadcast channel, an RRC message at the time of a start of communication, an RRC message in a handover, and an NAS message at the time of location registration.

16. The user apparatus according to claim 5, wherein

the control signal is configured to be transmitted by using any one of a broadcast channel, an RRC message at the time of a start of communication, an RRC message in a handover, and an NAS message at the time of location registration.

17. The user apparatus according to claim 2, wherein

the predetermined channel is at least one of an uplink shared channel, an uplink control channel, a sounding reference signal for uplink, a demodulation reference signal for uplink, and an uplink random access channel.

18. The user apparatus according to claim 3, wherein

the predetermined channel is at least one of an uplink shared channel, an uplink control channel, a sounding reference signal for uplink, a demodulation reference signal for uplink, and an uplink random access channel.

19. The user apparatus according to claim 4, wherein

the predetermined channel is at least one of an uplink shared channel, an uplink control channel, a sounding reference signal for uplink, a demodulation reference signal for uplink, and an uplink random access channel.

20. The user apparatus according to claim 5, wherein

the predetermined channel is at least one of an uplink shared channel, an uplink control channel, a sounding reference signal for uplink, a demodulation reference signal for uplink, and an uplink random access channel.

21. The user apparatus according to claim 6, wherein

the predetermined channel is at least one of an uplink shared channel, an uplink control channel, a sounding reference signal for uplink, a demodulation reference signal for uplink, and an uplink random access channel.

12. A mobile communication method in which a radio communication is performed between a base station apparatus and a user apparatus within a mobile communication system, comprising the steps of:

(A) receiving, at the user apparatus, a control signal designating a frequency band in a downlink; and

(B) controlling, at the user apparatus, a maximum transmission power in a predetermined channel of an uplink; and

in the step (B), the user apparatus determines whether or not to decrease the maximum transmission power in a predetermined channel from a rated power regulated in the mobile communication system, according to the frequency band designated by the control signal.