Wireless base station device

• US 8,412,274 B2
• Filed: 06/04/2007
• Issued: 04/02/2013
• Est. Priority Date: 06/08/2006
• Status: Active Grant

• Current Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Original Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Inventors: Hoshina, Koya, Kimoto, Yukinao
• Primary Examiner(s): PATEL, MAHENDRA R
• Application Number:
  US11/806,707
• Publication Number:
  US 20070287501A1
• Time in Patent Office: 2,129 Days
• Field of Search: 455/561, 455/524, 455/447, 455/450, 455/562.1, 370/335, 370/342, 370/133, 370/261, 370/318, 375/E1.021, 375/E1.023, 375/149, 375/143
• US Class Current: 455/562.1
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless base station device includes a wireless unit for performing wireless communications with a mobile station; a reception memory unit for storing therein reception spectrum spread data as reception data; a baseband reception unit for processing and decoding the reception data stored in the reception memory unit; a common downlink channel reception unit for receiving a downlink signal of other base station devices; a frame protocol processing unit for converting a transmission channel format; a baseband transmission unit for outputting encoded data; a spread processing unit for outputting spread-modulated data to the wireless unit; and a call controller for controlling an allocation of processing resources. Parameters including a spreading code and a transmission power required for installing the wireless base station device are automatically set by operating the common downlink channel reception unit to detect notification information and signal levels of neighboring base station devices.

Claims

1. A wireless base station, comprising:

a wireless unit for performing wireless communications with a mobile station;

a reception memory unit for storing therein reception spectrum spread data per sample as reception data, wherein the reception spectrum spread data is received by the wireless unit and sequentially sampled;

a baseband reception unit for processing and decoding the reception data stored in the reception memory unit;

a common downlink channel reception unit, activated at a start-up of said wireless base station, for receiving a downlink signal of one or more other base stations by using the reception data stored in the reception memory unit;

a frame protocol processing unit including an interface for communicating with a wired transmission line for an upper-level device, for performing a frame protocol processing for the interface to convert a transmission channel format with respect to an uplink signal received by the baseband reception unit and a downlink signal transmitted from the upper-level device;

a baseband transmission unit for encoding downlink data outputted from the frame protocol processing unit, and digitally modulating to output encoded data;

a spread processing unit for spread-modulating the encoded data outputted from the baseband transmission unit to output spread-modulated data to the wireless unit; and

a call controller for controlling an allocation of processing resources for each of the units when a new call is received by said wireless base station,

wherein a spreading code and a transmission power required for installing said wireless base station are automatically set by operating the common downlink channel reception unit at the start-up of the wireless base station device, and

wherein the spreading code is determined based on scramble codes of neighboring cell information including a list of scramble codes used by neighbor base stations, said neighboring cell information being notified from each of said other base stations and being acquired from the downlink signal received by said common downlink channel reception unit.

3. The wireless base station of claim 1, wherein, by providing a wired interface function for a control signal of a modularized terminal device for communicating with the wireless base station and setting a communications protocol control to the terminal device, the downlink signal of said other base stations is received by using the modularized terminal device to acquire installation conditions of said other base stations or propagation conditions of radio waves according to a wireless access method that are required when installing the wireless base station, so that the notification information and the signal levels of said other base stations are detected to automatically set the spreading code and the transmission power required for installing the wireless base station.

5. The wireless base station of claim 1, the transmission power is determined higher than the signal levels of said other base stations measured at the wireless base station.

6. The wireless base station of claim 5, the transmission power is set by adding a predetermined default level to an offset value determined according to the signal levels of said other base stations measured at the wireless base station.

9. The wireless base station of claim 1, wherein the spreading code and the transmission power are set to predetermined values, when said neighboring cell information is not acquirable from said other base stations.

2. A wireless base station, comprising:

a wireless unit for performing wireless communications with a mobile station and other wireless base stations;

a reception memory unit for storing therein reception spectrum spread data per sample as reception data, wherein the reception spectrum spread data is received by the wireless unit and sequentially sampled;

a baseband reception unit for processing and decoding the reception data accumulated in the reception memory unit;

a common downlink channel reception unit, activated at a start-up of said wireless base station, for receiving a downlink signal of one or more said other base stations by using the reception data stored in the reception memory unit;

a frame protocol processing unit including an interface for communicating with a wired transmission line for an upper-level device, for performing a frame protocol processing for the interface to convert a transmission channel format with respect to an uplink signal received by the baseband reception unit and a downlink signal transmitted from the upper-level device;

a baseband transmission unit for encoding downlink data outputted from the frame protocol processing unit, and digitally modulating to output encoded data;

a spread processing unit for spread-modulating the encoded data outputted from the baseband transmission unit to output spread-modulated data to the wireless unit; and

a call controller for controlling an allocation of processing resources for each of the units when a new call is received by said wireless base station,

wherein, at a start-up of said wireless base station, at least a part of a baseband signal processing is converted into a reception process for receiving the downlink signal from said other base stations, and said other base stations are searched, so that, if an effective cell detected, a transmission frequency of the wireless unit is set to be identical to a frequency of the effective cell, and a spreading code used for the spread processing unit is set to be different from that of the effective cell based on each of neighboring cell information including a list of scramble codes used by neighbor base stations, said neighboring cell information being notified from said other base stations and being acquired from the downlink signal received by said common downlink channel reception unit.

10. The wireless base station of claim 2, wherein the spreading code and the transmission power are set to predetermined values, when said neighboring cell information is not acquirable from said other base stations.

4. A wireless base station device, comprising:

a wireless unit for performing wireless communications with a mobile station and other wireless base station devices;

a reception memory unit for storing therein reception spectrum spread data per sample as reception data, wherein the reception spectrum spread data is received by the wireless unit and sequentially sampled;

a baseband reception unit for processing and decoding the reception data accumulated in the reception memory unit;

a frame protocol processing unit including an interface for communicating with a wired transmission line for an upper-level device, for performing a frame protocol processing for the interface to convert a transmission channel format with respect to an uplink signal received by the baseband reception unit and a downlink signal transmitted from the upper-level device;

a baseband transmission unit for encoding downlink data outputted from the frame protocol processing unit, and digitally modulating to output encoded data;

a spread processing unit for spread-modulating the encoded data outputted from the baseband transmission unit to output spread-modulated data to the wireless unit; and

a call controller for controlling an allocation of processing resources for each of the units when a new call is received by the wireless base station device;

wherein, at a start-up of the wireless base station device, at least a part of a baseband signal processing is converted into a reception process for receiving a downlink signal from other base station devices, and other base station devices are searched, so that, if an effective cell detected, a transmission frequency of the wireless unit is set to be identical to a frequency of the effective cell,

wherein a spreading code used for the spread processing unit is set to be different from that of the effective cell based on scramble codes included in notification information of the effective cell,

wherein a transmission power of the wireless base station device is determined based on signal levels of the other base station devices measured at the wireless base station device, and

wherein the transmission power is determined higher than the signal levels of the other base station devices measured at the wireless base station device.

7. The wireless base station device of claim 4, the transmission power is set by adding a predetermined default level to an offset value determined according to the signal levels of the other base station devices measured at the wireless base station device.

8. The wireless base station device of claim 7, the spreading code used for the spread processing unit is set to be different from that of the effective cell based on scramble codes included in notification information of the effective cell.