Digital radio communication apparatus with a RSSI information measuring function

• US 5,960,335 A
• Filed: 07/18/1996
• Issued: 09/28/1999
• Est. Priority Date: 07/21/1995
• Status: Expired due to Term

• Current Assignee: Fujitsu Mobile Communications Limited (Fujitsu Limited)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Wakabayashi, Naoyuki, Umemoto, Yuji
• Primary Examiner(s): Eisenzopf, Reinhard
• Assistant Examiner(s): Nguyen, Lee
• Application Number:
  US08/683,416
• Time in Patent Office: 1,167 Days
• Field of Search: 455/226.2, 455/226.1, 455/227, 455/140, 455/436, 455/437, 455/443, 455/444, 455/229, 455/234.1, 455/234.2, 455/245.1, 455/69, 455/553, 370/330, 370/331, 370/332, 375/345
• US Class Current: 455/226.2
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/382 for resource allocation, admission control or handover
• CPC Class Codes: H04W 36/302 due to low signal strength

Abstract

A radio communication apparatus according to the present invention is provided with first and second correction tables for correcting the measurement values of RSSI information by reception condition. The apparatus measures not only the RSSI information of the radio channel in a reception period of the radio channel assigned to itself by a TDMA scheme but also the reception period of the other radio channels in an idle period, and then corrects the RSSI information measurement values on the basis of the first and second correction tables. The corrected RSSI information measurement data is reported to the base station for MAHO.

Claims

1. In a mobile radio communication system that assigns a radio channel by a TDMA scheme to a radio communication apparatus intending to communicate and enables said radio communication apparatus to get into radio communication with a base station via the assigned radio channel, said radio communication apparatus comprising:

first measuring means for measuring the RSSI information of the radio channel in a first period corresponding to said assigned radio channel;

second measuring means for measuring the RSSI information of the other radio channels in a second period corresponding to an idle period for the radio channels excluding said assigned radio channel;

a first and second correction tables provided so as to correspond to the reception conditions in said first period and the reception conditions in said second period; and

correction means that corrects the RSSI information measurement values obtained from said first measuring means on the basis of said first correction table and determines the corrected RSSI information measurement values to be first measurement data and that corrects the RSSI information measurement value obtained from said second measuring means on the basis of said second correction table and determines the corrected RSSI information measurement values to be second measurement data.

2. A radio communication apparatus according to claim 1, wherein

said first and second measuring means each starts the measurement of RSSI information at the request of said base station, and

said correction means corrects the RSSI information measurement values obtained from said first and second measuring means and reports the corrected first and second measurement data items to said base station.

3. A radio communication apparatus according to claim 1, wherein

said first and second measuring means each starts the measurement of RSSI information independently, and

said correction means corrects the RSSI information measurement values obtained from said first and second measuring means, stores the corrected first and second measurement data items, and reads these first and second measurement data items at the request of said base station and then reports these data items to said base station.

4. A radio communication apparatus according to claim 1, 2, or 3, wherein

said first measuring means measures the RSSI information of the assigned radio channel a plurality of times and thereby obtains the measurement values, and

said correction means corrects, on the basis of said first correction table, the plurality of RSSI information measurement values obtained by the plurality of measurements at said first measuring means and takes the average of the corrected values and then determines the average to be the first measurement data item.

5. A radio communication apparatus according to claim 1, 2, or 3, wherein

said second measuring means measures the RSSI information of each of the other radio channels a plurality of times and thereby obtains the measurement values of each of the other channels, and

said correction means corrects, on the basis of said second correction table, the plurality of RSSI information measurement values obtained by the plurality of measurements at said second measuring means and takes the average of the corrected values and then determines the average to be the second measurement data item.

6. In a mobile radio communication system that assigns a radio channel by a TDMA scheme to a radio communication apparatus intending to communicate and enables said radio communication apparatus to get into radio communication with a base station via the assigned radio channel, said radio communication apparatus comprising:

automatic gain control means for performing an operation to keep constant the reception signal level of a radio signal sent from said base station;

control means for bringing said automatic gain control means into an operative state in a first period corresponding to said assigned radio channel and into an inoperative state in a second period corresponding to the other radio channels;

first measuring means for measuring the RSSI information of said assigned radio channel in said first period;

second measuring means for measuring the RSSI information of the other radio channels in said second period;

a first and second correction tables provided so as to correspond to the reception conditions for said automatic gain control means being set in an operative state and the reception conditions for said automatic gain control means being set in an inoperative state, respectively; and

correction means for correcting the RSSI information measurement values obtained from said first measuring means on the basis of said first correction table and the RSSI information measurement values obtained from said second measuring means on the basis of said second correction table.

7. In a mobile radio communication system that assigns a radio channel by the selective use of an FDMA scheme and a TDMA scheme to a radio communication apparatus intending to communicate and enables said radio communication apparatus to get into radio communication with a base station in an analog or digital mode via the assigned radio channel, said radio communication apparatus comprising:

first measuring means for measuring the RSSI information of the digital radio channel in a first period corresponding to the digital radio channel assigned by said TDMA scheme;

second measuring means for measuring the RSSI information of the other digital radio channels in a second period excluding said first period;

third measuring means for measuring the RSSI information of the digital radio channel in a third period corresponding to the analog radio channel assigned by said FDMA scheme;

a first, second, and third correction tables provided so as to correspond to the reception conditions in said first, second, and third periods, respectively; and

correction means for correcting the RSSI information measurement values obtained from said first, second, and third measuring means on the basis of said first, second, and third correction tables, respectively.

8. A method of measuring the RSSI information of a radio channel for use with a radio communication apparatus used in a mobile radio communication system that assigns a radio channel by a TDMA scheme to said radio communication apparatus intending to communicate and enables said radio communication apparatus to get into radio communication with a base station via the assigned radio channels said method comprising:

the step of measuring the RSSI information of the radio channel in a first period corresponding to said assigned radio channel;

the step of correcting the RSSI information measurement values obtained from the preceding step on the basis of first correction information previously set so as to correspond to the reception conditions in said first period;

the step of measuring the RSSI information of the other radio channels in a second period corresponding to an idle period excluding said assigned radio channel; and

the step of correcting the RSSI information measurement values obtained from the preceding step on the basis of second correction information previously set so as to correspond to the reception conditions in said second period.

9. In a mobile radio communication system that assigns a radio channel by a TDMA scheme to a radio communication apparatus intending to communicate and enables said radio communication apparatus to get into radio communication with a base station via the assigned radio channel, said radio communication apparatus comprising:

first measuring means for measuring the quality of the radio channel in a first period corresponding to said assigned radio channel;

second measuring means for measuring the quality of the other radio channels in a second period corresponding to an idle period for the radio channels excluding said assigned radio channel;

first and second correction information provided so as to correspond to the reception conditions in said first period and the reception conditions in said second period; and

correction means that corrects the quality measurement values obtained from said first measuring means on the basis of said first correction information and determines the corrected quality measurement values to be first measurement data and that corrects the quality measurement value obtained from said second measuring means on the basis of said second correction information and determines the corrected quality measurement values to be second measurement data.

10. A radio communication apparatus according to claim 9, wherein

said first and second measuring means each starts the measurement of quality at the request of said base station, and

said correction means corrects the quality measurement values obtained from said first and second measuring means and reports the corrected first and second measurement data items to said base station.

11. A radio communication apparatus according to claim 9, wherein

said first and second measuring means each starts the measurement of quality independently, and

said correction means corrects the quality measurement values obtained from said first and second measuring means, stores the corrected first and second measurement data items, and reads these first and second measurement data items at the request of said base station and then reports these data items to said base station.

12. A radio communication apparatus according to claim 9, 10, or 11, wherein

said first measuring means measures the quality of the assigned radio channel a plurality of times and thereby obtains the measurement values, and

said correction means corrects, on the basis of, said first correction information, the plurality of quality measurement values obtained by the plurality of measurements at said first measuring means and takes the average of the corrected values and then determines the average to be the first measurement data item.

13. A radio communication apparatus according to claim 9, 10, or 11, wherein

said second measuring means measures the quality of each of the other radio channels a plurality of times and thereby obtains the measurement values of each of the other channels, and

said correction means corrects, on the basis of said second correction information, the plurality of quality measurement values obtained by the plurality of measurements at said second measuring means and takes the average of the corrected values and then determines the average to be the second measurement data item.

14. In a mobile radio communication system that assigns a radio channel by a TDMA scheme to a radio communication apparatus intending to communicate and enables said radio communication apparatus to get into radio communication with a base station via the assigned radio channel, said radio communication apparatus comprising;

automatic gain control means for performing an operation to keep constant the reception signal level of a radio signal sent from said base station;

control means for bringing said automatic gain control means into an operative state in a first period corresponding to said assigned radio channel and into an inoperative state in a second period corresponding to the other radio channels;

first measuring means for measuring the quality of said assigned radio channel in said first period;

second measuring means for measuring the quality of the other radio channels in said second period;

first and second correction information provided so as to correspond to the reception conditions for said automatic gain control means being set in an operative state and the reception conditions for said automatic gain control means being set in an inoperative state, respectively, and

correction means for correcting the quality measurement values obtained from said first measuring means on the basis of said first correction information and the quality measurement values obtained from said second measuring means on the basis of said second correction information.

15. In a mobile radio communication system that assigns a radio channel by the selective use of an FDMA scheme and a TDMA scheme to a radio communication apparatus intending to communicate and enables said radio communication apparatus to get into radio communication with a base station in an analog or digital mode via the assigned radio channel, said radio communication apparatus comprising:

first measuring means for measuring the quality of the digital radio channel in a first period corresponding to the digital radio channel assigned by said TDMA scheme;

second measuring means for measuring the quality of the other digital radio channels in a second period excluding said first period;

third measuring means for measuring the quality of the digital radio channel in a third period corresponding to the analog radio channel assigned by said FDMA scheme;

first, second, and third correction information provided so as to correspond to the reception conditions in said first, second, and third periods, respectively; and

correction means for correcting the quality measurement values obtained from said first, second, and third measuring means on the basis of said first, second, and third correction information, respectively.

16. A method of measuring the quality of a radio channel for use with a radio communication apparatus used in a mobile radio communication system that assigns a radio channel by a TDMA scheme to said radio communication apparatus intending to communicate and enables said radio communication apparatus to get into radio communication with a base station via the assigned radio channel, said method comprising;

the step of measuring the quality of the radio channel in a first period corresponding to said assigned radio channel;

the step of correcting the quality measurement values obtained from the preceding step on the basis of first correction information previously set so as to correspond to the reception conditions in said first period;

the step of measuring the quality of the other radio channels in a second period corresponding to an idle period excluding said assigned radio channel; and

the step of correcting the quality measurement values obtained from the preceding step on the basis of second correction information previously set so as to correspond to the reception conditions in said second period.

17. A radio communication apparatus usable in a TDMA mobile radio communication system in which said radio communication apparatus is assigned a radio channel for communicating with a base station, said radio communication apparatus comprising:

circuitry for measuring the quality of the assigned radio channel in a first time period which corresponds to the assigned radio channel and for measuring the quality of other radio channels in a second time period which corresponds to an idle time of said radio communication apparatus;

a memory for storing first correction data corresponding to reception conditions in said first time period and second correction data corresponding to reception conditions in said second time period; and

a controller for correcting measurements of the quality of the assigned radio channel using the first correction data and correcting measurements of the quality of the other radio channels using the second correction data.