Reverse closed loop power control in control hold state for CDMA communication system

• US 6,816,476 B2
• Filed: 11/27/2002
• Issued: 11/09/2004
• Est. Priority Date: 08/25/1998
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Young-Ky, Kim, Jae-Yeol, Ahn, Jae-Min, Park, Su-Won
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US10/305,711
• Publication Number:
  US 20030078067A1
• Time in Patent Office: 713 Days
• Field of Search: 370/342, 370/328, 370/335, 455/69, 455/522
• US Class Current: 370/342
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/38 TPC being performed in particular situations
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission

Abstract

A base station device for a CDMA communication system includes a controller for changing a reference value for reverse closed loop power control in a control hold state, and a forward dedicated control channel transmitter for transmitting a power control bit for controlling transmission power of a reverse link according to the changed reference value.

Claims

1. A mobile communication system, comprising:

a base station device for changing a reference value set for reverse closed loop power control in an active state in to a lower reference value to be used in a control hold state, and transmitting a power control bit for controlling transmission power of a reverse link according to the changed reference value; and

a mobile station device for controlling transmission power of a reverse pilot channel according to the power control bit from the base station device.

2. The mobile communication system as claimed in claim 1, wherein the base station device determines a gating rate representing a transmission period of a power control bit, and transmits the power control bit at the determined gating rate.

3. The mobile communication system as claimed in claim 1, wherein the reverse pilot channel includes forward power control information.

4. The mobile communication system as claimed in claim 1, wherein upon activation of a reverse dedicated control channel, the base station device increases a transmission power of the reverse pilot channel above a reference value for performing reverse closed loop power control.

5. The mobile communication system as claimed in claim 3, wherein the mobile station device increases the transmission power of the reverse dedicated control channel by a predetermined amount which is defined as a system parameter.

6. The mobile communication system as claimed in claim 3, wherein the mobile station device neglects a reverse power control bit received at an activated time of the reverse dedicated control channel.

7. The mobile communication system as claimed in claim 3, wherein the mobile station device ignores a power-down command contained within reverse power control bits at a duration where the reverse dedicated control channel is activated, and applies a power-up command contained within the received reverse power control bits to control the transmission power of the reverse link.

8. The mobile communication system as claimed in claim 1, wherein upon activation of a reverse dedicated control channel, the mobile station device increases a transmission power of the reverse pilot channel above the reference value for performing closed loop power control for a duration defined as a system parameter, including a duration where the reverse dedicated control channel is activated.