Method of determining initial transmission power

• US 5,487,180 A
• Filed: 03/17/1994
• Issued: 01/23/1996
• Est. Priority Date: 09/20/1993
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ohtake, Koji
• Primary Examiner(s): Urban, Edward F.
• Application Number:
  US08/215,093
• Time in Patent Office: 677 Days
• Field of Search: 455/68, 455/69, 455/54.1, 455/54.2, 455/56.1, 455/63, 455/70, 379/59, 379/60
• US Class Current: 455/522
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

A method for determining an initial transmission power in a mobile communication system having a base station and at least one mobile station includes measuring at the mobile station, a reception level of a control channel leading from the base station to the mobile station, and determining an initial transmission power value of a talk channel leading from the base station to the mobile station, based on the reception level measured at the mobile station.

Claims

1. A method of determining an initial transmission power in a mobile communication system having a base station and at least one mobile station, a control channel leading from the base station to the mobile station and a talk channel leading from the base station to the mobile station, said method comprising the steps of:

(a) measuring, at the mobile station, a reception level of said control channel leading from the base station to the mobile station;

(b) obtaining a comparison result, at the mobile station, by comparing the measured reception level with a threshold value which is used to determine an initial transmission power value of said talk channel;

(c) determining, at the mobile station, the initial transmission power value of said talk channel based on the comparison result, and reporting the initial transmission power value of said talk channel to the base station; and

(d) setting, at the base station, the initial transmission power value of said talk channel, reported from the mobile station.

2. A method of determining an initial transmission power in a mobile communication system having a base station and at least one mobile station, a control channel leading from the mobile station to the base station and a talk channel leading from the mobile station to the base station, said method comprising the steps of:

(a) reporting from the mobile station a transmission power value of said control channel to the base station;

(b) measuring, at the base station, a reception level of said control channel leading from the mobile station to the base station in response to the report made in said step (a);

(c) obtaining a comparison result, at the base station, by comparing the measured reception level with a threshold value which is used to determine an initial transmission power value of said talk channel;

(d) notifying from the base station to the mobile station, as the initial transmission power value of said talk channel, a value which is obtained by correcting a transmission power value of said control channel reported from the mobile station by the comparison result; and

(e) setting, at the mobile station, the value notified by said step (d) as the initial transmission power value of said talk channel.

3. A method of determining an initial transmission power in a mobile communication system having a base station and at least one mobile station, a control channel leading from the mobile station to the base station and a talk channel leading from the mobile station to the base station, said method comprising the steps of:

(a) reporting from the mobile station to the base station, information about a mobile station type and a control value which is used for an autonomous transmission power control of a transmission power of said control channel;

(b) measuring, at the base station, a reception level of said control channel and obtaining a comparison result by comparing the measured reception level with a threshold value which is used to determine an initial transmission power value of said talk channel;

(c) notifying from the base station to the mobile station, as the initial transmission power value of said talk channel dependent on the mobile station type, a value which is obtained by correcting by the comparison result a transmission power value which is determined by said information about the mobile station type and the control value which are reported in said step (a); and

(d) setting, at the mobile station, the value notified by said step (c) as the initial transmission power value of said talk channel.

4. A method according to claim 3, wherein said information is indicative of a maximum transmission power at which the mobile station can transmit signals.

5. A method of determining an initial transmission power in a mobile communication system having a base station and at least one mobile station, a control channel leading from the mobile station to the base station and a talk channel heading from the mobile station to the base station, said method comprising the steps of:

(a) measuring, at the base station, a reception level of said control channel leading from the mobile station to the base station, and notifying the measured reception level to the mobile station;

(b) obtaining a comparison result at the mobile station by comparing the measured reception level notified by said step (a) with a threshold value which is used to determine an initial transmission power value of said talk channel; and

(c) setting, at the mobile station, as the initial transmission power value of said talk channel, a value which is obtained by correcting a transmission power value of said control channel by the comparison result.

6. A method of determining an initial transmission power in a mobile communication system having a base station and at least one mobile station, a control channel leading from the mobile station to the base station and a talk channel leading from the mobile station to the base station, said method comprising the steps of:

(a) measuring, at the base station, a reception level of said control channel leading from the mobile station to the base station, and notifying to the mobile station, a comparison result which is obtained by comparing the measured reception level with a threshold value which is used to determine an initial transmission power value of said talk channel; and

(b) determining, at the mobile station, as the initial transmission power value of said talk channel, a value which is obtained by correcting by the comparison result notified by said step (a), a transmission power value which is determined by information about the mobile station type and a control value which is used for an autonomous transmission power control.

7. A method of determining an initial transmission power in a mobile communication system having a base station and at least one mobile station, a control channel leading from the mobile station to the base station and a talk channel leading from the mobile station to the base station, said method comprising the steps of:

(a) measuring, at the base station, a reception level of said control channel leading from the mobile station to the base station, and notifying the measured reception level to the mobile station;

(b) obtaining a comparison result, at the mobile station, by comparing the measured reception level notified by said step (a) with a threshold value which is used to determine an initial transmission power value of said talk channel; and

(c) setting, at the mobile station, as the initial transmission power value of said talk channel, a value which is obtained by correcting by the comparison result a transmission power value which is determined by information about the mobile station type and a control value which is used for an autonomous transmission power control.

8. A method according to claim 7, wherein said information is indicative of a maximum transmission power at which the mobile station can transmit signals.