Wireless communication base station system, wireless communication method, wireless communication program, and computer-readable recorded medium on which wireless communication program is recorded

• US 20040005897A1
• Filed: 02/20/2003
• Published: 01/08/2004
• Est. Priority Date: 06/21/2001
• Status: Abandoned Application

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kashiwagi, Takashi, Tomoe, Naohito
• Application Number:
  US10/344,561
• Publication Number:
  US 20040005897A1
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

In the configuration of the radio communication base station system which connects the macro radio/optical sending-receiving unit 400 which communicates by radio with the mobile station 300 which exists in the macro sector zone 100 and the micro radio/optical sending-receiving unit 500 which communicates by radio with the mobile station which exists in the micro sector zone 200 to the base station 700 which is used commonly using the optical fiber network 600, it is possible to reduce the interference between the macro sector zone and the micro sector zone, which occurs in applying the CDMA method using the same frequency band to a cell configuration in which the macro sector zone 100 and the micro sector zone 200 coexist, and increase the capacity of the base station.

Claims

1. A radio communication base station system comprising:

a macro radio communication unit for communicating by radio with a mobile station which exists in a macro sector zone which is an area for communicating by radio with the mobile station;

a micro radio communication unit for communicating by radio with the mobile station which exists in a micro sector zone which is a part of the macro sector zone; and

a base station which is commonly used by the macro radio communication unit and the micro radio communication unit.

2. The radio communication base station system of claim 1 further comprising:

a radio network control device for allocating a setup channel which is necessary for the mobile station to register a location respectively for the macro radio communication unit and the micro radio communication unit and sending allocation information of the allocated channel to the base station.

3. The radio communication base station system of claim 2,

wherein the base station receives a location registration request sent by the mobile station via the macro radio communication unit and the micro radio communication unit, and sends the location registration request received to the radio network control device;

wherein the radio network control device judges if the location registration request sent by the base station is a request for registering a location in the micro sector zone or a request for registering a location in the macro sector zone, sends location registration permission to the base station when the location registration request is the request for registering the location in the micro sector zone, and sends location registration unpermission to the base station when the location registration request is the request for registering the location in the macro sector zone.

4. The radio communication base station system of claim 1, wherein the base station includes a plurality of encoding/modulating units set for each of a plurality of mobile stations for encoding and modulating an electric signal, and a multiplexer connected to the plurality of coding/modulating units for multiplexing the electric signal modulated by the plurality of coding/modulating units.

5. The radio communication base station system of claim 1, wherein the base station includes a plurality of encoding/modulating units set for each of a plurality of mobile stations for encoding and modulating an electric signal, and a multiplexer connected to all of the plurality of coding/modulating units for multiplexing the electric signal modulated by the plurality of coding/modulating units.

6. The radio communication base station system of claim 1, wherein the base station includes a plurality of encoding/modulating units set for all of a plurality of mobile stations for encoding and modulating an electric signal, and a multiplexer connected to all of the plurality of coding/modulating units for multiplexing the electric signal modulated by the plurality of coding/modulating units and outputting the electric signal multiplexed, wherein the micro radio communication unit includes a delay unit for operating a time factor of the electric signal outputted by the multiplexer.

7. The radio communication base station system of claim 1, wherein the macro radio communication unit includes an electric/optical converter for converting an electric signal into an optical signal, wherein the micro radio communication unit includes an electric/optical converter for converting an electric signal to an optical signal, wherein a plurality of base stations includes a plurality of optical/electric converters for converting the optical signals converted by macro radio communication unit and the micro radio communication unit into electric signals, and a demodulating/decoding unit connected to the plurality of optical/electric converters for demodulating and decoding the electric signal converted by the plurality of optical/electric converters.

8. The radio communication base station system of claim 1, wherein the macro radio communication unit includes an electric/optical converter for converting an electric signal into an optical signal, wherein the micro radio communication unit includes an electric/optical converter for converting an electric signal into an optical signal, wherein the base stations includes a plurality of optical/electric converters for converting the optical signals converted by the macro radio communication unit and the micro radio communication unit into electric signals, and a demodulating/decoding unit connected to all of the plurality of optical/electric converters for demodulating and decoding the electric signal converted by the plurality of optical/electric converters.

9. The radio communication base station system of claim 1, wherein the macro radio communication unit includes an electric/optical converter for converting an electric signal into an optical signal, wherein the micro radio communication unit includes an electric/optical converter for converting an electric signal into an optical signal and a delay unit for operating a time factor of a radio signal, wherein the base stations includes a plurality of optical/electric converters for converting the optical signals converted by the macro radio communication unit and the micro radio communication unit into electric signals, and a demodulating/decoding unit connected to all of the plurality of optical/electric converters for demodulating and decoding the electric signals converted by the plurality of optical/electric converters.

10. The radio communication base station system of claim 4, wherein the encoding/modulating unit of the base station includes a sector/antenna branch selector in sending system for selecting a plurality of macro radio communication units and micro radio communication units.

11. The radio communication base station system of claim 7, wherein the demodulating/decoding unit of the base station includes a sector/antenna branch selector in receiving system for selecting and receiving the electric signals converted by the plurality of the optical/electric converters.

12. The radio communication base station system of claim 7, wherein the base station includes an interference replica producing unit connected to all of the demodulating/decoding units for producing interference information from a received signal demodulated by the demodulating/decoding unit, spread information for spreading the received signal and an estimated transmission path characteristic estimated a transmission path of the received signal.

13. The radio communication base station system of claim 7, wherein the demodulating/decoding unit includes a moving speed detecting unit for detecting and sending a moving speed of the mobile station, wherein the radio network control device receives the moving speed of the mobile station sent by the demodulating/decoding unit, compares the moving speed with a reference moving speed determined by the radio network control device, and sends channel allocation information for allocating to the macro radio communication unit to the base station when the moving speed of the mobile station is higher than the reference moving speed, and sends channel information for allocating to the micro radio communication unit to the base station when the moving speed of the mobile station is at or lower than the reference moving speed.

14. The radio communication base station system of claim 12, wherein the base station compares a receiving electric power of a received signal of the mobile station with a reference receiving electric power determined by the base station, wherein the interference replica producing unit produces an interference replica, deducts the interference replica from a received signal of another mobile station existing in one of the micro sector zone and the macro sector zone located in a same direction with an arrival angle of the received signal from the mobile station, and directs an antenna toward the arrival direction of the received signal from the mobile station when the receiving electric power is higher than the reference receiving electric power, and deducts the interference replica from a received signal of another mobile station existing in the micro sector zone and a micro sector zone adjacent to the micro sector zone, and deducts the interference replica from a received signal of another mobile station existing in the macro sector zone located in the same direction with the arrival angle of the received signal from the mobile station when the receiving electric power is at or lower than the reference receiving electric power.

15. The radio communication base station system of claim 1, wherein the macro radio communication unit includes an adaptive array antenna, wherein the micro radio communication unit includes one of an omni-antenna and a sector antenna.

16. A radio communication base station system comprising:

a plurality of micro radio communication units including an electric/optical converter for converting an electric signal into an optical signal, for communicating by radio with a mobile station existing in a micro sector zone which is an area for communicating by radio with the mobile station;

a radio network control device for allocating a channel for communicating by radio to a micro radio communication unit, and sending channel allocation information allocated;

a base station which is commonly used by the plurality of micro radio communication units;

a plurality of encoding/modulating units including a sector/antenna branch selector in sending system respectively set for a plurality of mobile stations for selecting the micro radio communication unit for communicating by radio for the micro sector zone of which receiving electric power of a received signal of the mobile station is high and the plurality of micro radio communication units for communicating by radio for the micro sector zone adjacent to the micro sector zone for encoding and modulating an electric signal;

a multiplexer connected to the plurality of encoding/modulating units for multiplexing the electric signal modulated by the plurality of encoding/modulating units;

a plurality of optical/electric converters for converting the optical signal converted by the micro radio communication unit into an electric signal; and

a demodulating/decoding unit connected to the plurality of optical/electric converters for demodulating and decoding the electric signal, including a sector/antenna branch selector in receiving system for selecting the micro radio communication unit for communicating by radio for the micro sector zone of which receiving electric power of the received signal of the mobile station is high and the plurality of micro radio communication units for communicating by radio for the micro sector zone adjacent to the micro sector zone from on the received signal of the mobile station, converted by the plurality of optical/electric converters.

17. A radio communication method comprising:

communicating by radio with a mobile station existing in a macro sector zone which is an area for communicating by radio with the mobile station;

communicating by radio with the mobile station existing in a micro sector zone which is a part of the macro sector zone; and

communicating by radio with the mobile station existing in the macro sector zone and communicating by radio with the mobile station existing in the micro sector zone by using a base station which is used commonly.

18. A computer-executable radio communication program comprising:

code segment for communicating by radio with a mobile station existing in a macro sector zone which is an area for communicating by radio with the mobile station;

code segment for communicating by radio with the mobile station existing in a micro sector zone which is a part of the macro sector zone; and

code segment for communicating by radio with the mobile station existing in the macro sector zone and communicating by radio with the mobile station existing in the micro sector zone by using a base station which is used commonly.

19. A computer-readable storage medium storing a computer-executable radio communication program comprising:

code segment for communicating by radio with a mobile station existing in a macro sector zone which is an area for communicating by radio with the mobile station;

code segment for communicating by radio with the mobile station existing in a micro sector zone which is a part of the macro sector zone; and

code segment for communicating by radio with the mobile station existing in the macro sector zone and communicating by radio with the mobile station existing in the micro sector zone by using a base station which is used commonly.