Radio communication scheme

• US 20010004604A1
• Filed: 12/13/2000
• Published: 06/21/2001
• Est. Priority Date: 12/15/1999
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Toshimitsu, Kiyoshi, Ito, Kuniaki, Tsujimura, Akihiro, Obayashi, Shuichi, Shoki, Hiroki
• Granted Patent: US 7,006,465 B2
• Time in Patent Office: Days
• US Class Current: 455/562.1
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 3/2676 Optically controlled phased array
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

This is a radio communication system having a radio base station controller 20 which is connected to a plurality of base stations 10n−1, 10n and 10n+1, and then assigns a fixed channel to each of radio mobile stations 18a, 18b and 18c, and further controls the beam patterns of the radio base stations 10n−1, 10n and 10n+1, and accordingly carries out the radio communications with the radio mobile stations 18a, 18b and 18c. The radio base station controller 20, when transmitting to and receiving from the different radio mobile stations 18a, 18b and 18c to which the same channel is assigned, controls the beam patterns so that the channels do not interfere with each other.

Claims

1. A radio communication system comprising:

(a) at least one mobile station;

(b) a plurality of base stations configured to generate a plurality of beam patterns; and

(c) a base station controller which is connected to the plurality of base stations, and then assigns a fixed channel to each mobile station, controls the beam patterns of the base stations and accordingly carries out a radio communication with the mobile station, the base station controller having a device which when carrying out a transmission and a reception to and from a different mobile station to which the same channel is assigned, controls the beam patterns so that the channels do not interfere with each other.

2. A radio communication system of

claim 1

,

wherein the mobile station is a mobile station running on a road, and at least a part of the plurality of base stations are arranged along the road.

3. A radio base station controller which is connected to a plurality of base stations configured to generate a plurality of beam patterns, and then controls an antenna that is installed in each of the base stations and composed of a plurality of antenna devices, and accordingly carries out a radio communication with a mobile station, the radio base station controller comprising:

(a) an antenna controller configured to control the antenna in each of the base stations; and

(b) at least one modulating/demodulating device configured to modulate and demodulate a signal which is transmitted to and received from the mobile station.

4. A radio base station controller of

claim 3

, wherein the antenna controller comprises:

a selector configured to select at least one antenna device from the plurality of base stations; and

a setter configured to set a weight of the selected antenna device.

5. A radio base station controller of

claim 4

, wherein the setter has a device configured to determine the weight of the antenna device so that when a transmission or a reception is carried out to or from a different mobile station to which the same channel is assigned.

6. A radio base station controller of

claim 4

, wherein the antenna controller further has a measuring device configured to measure respective reception strengths of the respective antenna devices in the plurality of base stations.

7. A radio base station controller of

claim 3

, wherein the mobile station is a mobile station running on a road, and at least a part of the plurality of base stations are arranged along the road.

8. A radio base station controller which is connected to a plurality of base stations arranged along a road, and then controls the plurality of base stations, and accordingly carries out a radio communication with at least one mobile station running on the road, the radio station controller comprising:

(a) a device configured to assign the same channel to each mobile station of the same speed or the same lane;

(b) a device configured to detect at least one of the speed and the lane of the mobile station; and

(c) a device which when the speed or the lane of the mobile station is changed, changes an assignment channel, in accordance with a speed or a lane after the change.

9. A radio base station controller of

claim 8

, wherein a communication interval is changed depending on the change of the speed of the mobile station.

10. A radio mobile station which is connected to a plurality of base stations configured to generate a plurality of beam patterns, and then carries out a radio communication with a base station controller that can control an antenna installed in each of the base stations and composed of a plurality of antenna devices,

wherein the radio mobile station transmits a signal including at least information to identify the radio mobile station, even if there is not a signal to be transmitted to the base station controller.

11. A radio base station controller which is connected to a plurality of base stations arranged along a road, and then controls the plurality of base stations and accordingly carries out a radio communication with at least one mobile station running on the road, wherein a boundary between radio base station controllers adjacent to each other is positioned in a portion in which a movement destination of the mobile station on the road can be pointed out.

12. A radio communication system comprising:

(a) at least one mobile station having a device configured to select, from a plurality of same reception signals, a reception signal in which a reception state is better;

(b) a first base station controller having a device configured to detect a start of a communication between a predetermined first base station and a mobile station, a device configured to request a hand-over process to the mobile station, and a device configured to transfer a transmission signal to the mobile station to a base station controller of a hand-over destination of the mobile station, the first base station controller connected to a first base station group including the predetermined first base station; and

(c) a second base station controller having a device configured to transmit the transmission signal transferred from the first base station controller, through a predetermined second base station to the mobile station, the second base station controller connected to a second base station group including the predetermined second base station.

13. A radio communication system of

claim 12

, wherein the predetermined first and second base stations are arranged close to a boundary between the first and second base station controllers.

14. A radio communication system of

claim 12

, wherein the mobile station is a mobile station running on a road, and at least a part of the first and second base station groups including the predetermined first and second base stations is positioned in a portion in which a movement destination of the mobile station on the road can be pointed out.

15. A radio communication system of

claim 14

, wherein the first base station controller further comprises:

a device configured to detect a speed of the mobile station; and

a device configured to change the predetermined first base station, in accordance with the detected speed.

16. A radio communication system of

claim 14

, wherein the first and second base station groups arranged along the road are arranged in a predetermined interval, and an interval between a first base station and a second base station which are the closest to each other is shorter than the predetermined interval.

17. A radio communication system of

claim 14

, wherein the first and second base station controllers select an optimal transmission rate and error correction code in accordance with a speed of the mobile station when performing a hand-over process on the mobile station, and then carry out a transmission and a reception to and from the mobile station.

18. A radio communication method comprising the steps of:

(a) detecting a start of a communication between a predetermined first base station connected to a first base station controller and a mobile station running on a road;

(b) requesting a hand-over process to the mobile station;

(c) transferring to a second base station controller, a signal to be transferred through the predetermined first base station to the mobile station;

(d) transmitting the signal to the mobile station through a predetermined second base station connected to the second base station controller; and

(e) selecting a signal in which a reception state is better, from two signals received by the mobile station.

19. A radio communication method of

claim 18

, wherein the predetermined first and second base stations are arranged close to a boundary between the first and second base station controllers.

20. A radio communication method of

claim 19

,

wherein the first base station controller is connected to a first base station group including the predetermined first base station,

the second base station controller is connected to a second base station group including the predetermined second base station, and

at least a part of the first and second base station groups including the predetermined first and second base stations is arranged along a portion in which a movement destination of the mobile station on the road can be pointed out.