Mobile communication system with transmitting systems with different outputting power

• US 6,415,161 B1
• Filed: 09/01/1999
• Issued: 07/02/2002
• Est. Priority Date: 09/11/1998
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Fujita, Noriyuki
• Primary Examiner(s): Maung, Nay
• Assistant Examiner(s): Trinh, Sonny
• Application Number:
  US09/388,196
• Time in Patent Office: 1,035 Days
• Field of Search: 455/440, 455/456, 455/457, 455/25, 455/562, 455/97, 455/500, 455/526, 455/73, 455/561, 455/522, 455/443, 455/444, 370/337, 370/347, 370/442
• US Class Current: 455/561
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A radio cell station apparatus includes a plurality of transmitters and a controller. The plurality of transmitters can transmit signals to a personal mobile station. The controller selectively activates one of the plurality of transmitters based on a positioning data corresponding to a position of the personal mobile station, such that the activated transmitter communicates with the radio cell station apparatus using a transmission signal.

Claims

1. A radio cell station apparatus comprising:

a plurality of transmitters for transmitting signals to a personal mobile station, at least one of said plurality of transmitters comprising a high power transmitter and a second of said plurality of transmitters comprising a lower power transmitter; and

a controller selectively activating one of said high power transmitter and said lower power transmitter based on a positioning data corresponding to a position of said personal mobile station, such that said activated transmitter communicates with said radio cell station apparatus using a transmission signal.

2. A radio cell station apparatus according to claim 1, wherein said positioning data correspond to an electric field strength of said transmission signal outputted by said radio cell station apparatus and received by said personal mobile station.

3. A radio cell station apparatus according to claim 1, further comprising a single body, such that said plurality of transmitters are accommodated inside said single body.

4. A radio cell station apparatus according to claim 1, wherein said controller includes:

a distance measuring section measuring a distance from said radio cell station apparatus to said personal mobile station; and

a transmitter selecting section selecting one of said high power transmitter and said lower power transmitter as said activated transmitter based on said distance measured by said distance measuring section.

5. A radio cell station apparatus according to claim 1, wherein said controller includes:

a transmitter selecting section selecting any one of said high power transmitter and said lower power transmitter as said activated transmitter based on a field strength of said transmission signal which is outputted by said radio cell station apparatus and are received by said personal mobile station, a data indicating said electric field strength being transmitted to said radio cell station.

6. A radio cell station apparatus according to claim 1, wherein a control channel used to control outgoing/incoming call is assigned to a first signal outputted from said first transmitter.

7. A radio cell station apparatus comprising:

a plurality of transmitters for transmitting signals to a personal mobile station; and

a controller selectively activating one of said plurality of transmitters based on a positioning data corresponding to a position of said personal mobile station, such that said activated transmitter communicates with said radio cell station apparatus using a transmission signal,

wherein said plurality of transmitters includes;

a first transmitter outputting said transmission signal at a rated power; and

a second transmitter outputting said transmission signal at a power lower than said rated power,

wherein a plurality of communication channels are respectively assigned to a first signal outputted from said first transmitter and a second signal outputted from said second transmitter, and

a first number of said communication channels assigned to said first signal and a second number of said communication channels assigned to said second signal are respectively defined based on respective service areas determined by respective transmission powers of said first signal and said second signal.

8. A radio cell station apparatus comprising:

a plurality of transmitters transmittable signals to a personal mobile station; and

a controller selectively activating one of said plurality of transmitters based on a positioning data corresponding to a position of said personal mobile station, such that said activated transmitter communicates with said radio cell station apparatus using a transmission signal,

wherein said plurality of transmitters includes;

a first transmitter outputting said transmission signal at a rated power; and

a second transmitter outputting said transmission signal at a power lower than said rated power,

wherein a first signal outputted from said first transmitter includes;

a first frame assigned to four transmission slots, wherein a control channel controlling outgoing/incoming call and three communication channels are assigned to said four transmission slots of said first flame, and wherein a second signal outputted from said second transmitter includes;

a second frame including four transmission slots, said three communication channels are assigned to three of said four transmission slots of said second flame.

9. A mobile communication method comprising:

(a) providing a radio cell station having a first transmitter outputting a first transmission signal at a first power and a second transmitter outputting a second transmission signal at a second power lower than said first power;

(b) obtaining data corresponding to a distance between said radio cell station and a personal station communicating with said radio cell station, and judging whether or not said data exceeds a pre-determined value;

(c) outputting said second transmission signal from said second transmitter of said radio cell station to said personal mobile station, when said data exceeds said pre-determined value; and

(d) outputting said first transmission signal from said first transmitter of said radio cell station to said personal mobile station, when said data does not exceed said pre-determined value.

10. A mobile communication method according to claim 9, wherein said data is determined based on a field strength of said transmission signal which is outputted by said radio cell station and is received by said personal mobile station.

11. A mobile communication method according to claim 9, wherein a control channel used by controlling the outgoing/incoming call is assigned to said first transmission signal outputted by said first transmitter.

12. A mobile communication method comprising:

(a) providing a radio cell station having a first transmitter outputting a first transmission signal at a first power and a second transmitter outputting a second transmission signal at a second power lower than said first power;

(b) obtaining data corresponding to a distance between said radio cell station and a personal station communicating with said radio cell station, and judging whether or not said data exceeds a predetermined value;

(c) outputting said second transmission signal from said second transmitter of said radio cell station to said personal mobile station, when said data exceeds said pre-determined value; and

(d) outputting said first transmission signal from said first transmitter of said radio cell station to said personal mobile station, when said data does not exceed said pre-determined value, said (c) outputting further includes;

(e) outputting said first transmission signal from said first transmitter of said radio cell station to said personal mobile station, when said data exceed s said pre-determined value and communication channels assigned to said second transmission signal outputted by said second transmitter are all busy, wherein said communication channels are composed of the predetermined number of transmission slots assigned to said second transmission signal.

13. A personal Handy-phone System (PHS) public cell station apparatus comprising:

a single body; and

a plurality of transmitters contained in said single body, wherein said plurality of transmitters include;

a first transmitter which outputs a first transmission signal at a first power wherein a plurality of slots assigned to a first frame in said first transmission signal are composed of a control channel used by controlling outgoing/incoming call and a plurality of said communication channels capable of communicating a plurality of mobile station at the same time, and

a second transmitter which outputs a second transmission signal at a second power lower than said first power wherein a plurality of slots assigned to a second frame in said second transmission signal are composed of a plurality of said communication channels.

14. A PHS public cell station apparatus according to claim 13, wherein said first frame is provided with one slot assigned to said control channel and three slots assigned to said communication channels, and said second frame is provided with three slots assigned to said communication channels.

15. A PHS public cell station apparatus according to claim 13, further comprising:

a controller selectively activating one of said first transmitter or second transmitter based on positioning data corresponding to a position of said personal mobile station such that said activated transmitter communicates with said PHS public cell station apparatus using a transmission signal.

16. A PHS public cell station apparatus according to claim 14, wherein said first transmitter communicates with a personal mobile station in a first transmitting area and said second transmitter communicates with a personal mobile station in a second transmitting area wherein all of said second transmitting area is inside said first transmitting area;

and further comprising

a controller which controls said first transmitter to be activated when a personal mobile station communicating with said PHS public cell station apparatus is inside said first transmitting area except said second transmitting area or when said personal mobile station is inside said second transmitting area and all of said communication channels of said second transmitter is assigned to another personal mobile stations, and which controls said second transmitter to be activated when said personal mobile station is inside said second transmitting area and at least one of said communication channels of said second transmitter is not assigned to another personal mobile stations.