Apparatus and method for reporting service load to mobile station in mobile telecommunication system

• US 6,937,640 B2
• Filed: 06/15/2001
• Issued: 08/30/2005
• Est. Priority Date: 06/21/2000
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yoon, Soon-Young, Kang, Hee-Won, Huh, Hoon, Yang, Sang-Hyun, Yun, Yu-Suk, Yeom, Jae-Heung
• Primary Examiner(s): Ha, Dac V.
• Application Number:
  US09/882,322
• Publication Number:
  US 20020012385A1
• Time in Patent Office: 1,537 Days
• Field of Search: 375/140, 375/141, 375/146, 375/219, 375/220, 375/295, 455/13.4, 455/33.2, 370/252, 370/320, 370/331, 370/335, 370/342, 370/437, 370/441, 370/479, 370/490, 370/500
• US Class Current: 375/141
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 7/264 for data rate control
• CPC Class Codes: H04J 13/004 Orthogonal
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 52/322 Power control of broadcast channels
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

There is provided a method and apparatus for selecting an appropriate base station and an optimal data rate to provide a voice service and a data service based on a voice service load in a CDMA system. A base station transmits two pilot signals orthogonally spread with different orthogonal codes in association with its voice service load, and a mobile station estimates the voice service load based on a pilot power ratio.

Claims

1. A transmitter in a base station, comprising:

a pilot gain controller for generating a first gain value and a second gain value according to a current transmission power and a remaining transmission power of the base station;

a first multiplier for receiving pilot bits, multiplying the pilot bits by the first gain value, and generating a first control signal, and thereby controlling the transmission power level of the pilot bits;

a second multiplier for receiving the pilot bits, multiplying the pilot bits by the second gain value, and generating a second control signal, and thereby controlling the transmission power level of the pilot bits;

a first spreader for generating a first pilot signal by spreading the first control signal with a first orthogonal code;

a second spreader for generating a second pilot signal by spreading the second control signal with a second orthogonal code; and

an adder for adding the first pilot signal to the second pilot signal.

2. The transmitter of claim 1, wherein the first and second pilot signals are transmitted continuously in time.

3. The transmitter of claim 1, wherein the first and second pilot signals are transmitted periodically in time.

4. The transmitter of claim 1, wherein a ratio of the transmission power of the second pilot signal to the transmission power of the first pilot signal is the current transmission power.

5. A transmitter in a base station, comprising:

a pilot gain controller for generating a first gain value and a second gain value according to a current transmission power and a remaining transmission power of the base station;

a first pilot channel generator for receiving pilot bits and generating a first pilot channel signal by controlling the gain of the pilot bits with the first gain value and spreading the gain-controlled signal with a first orthogonal code;

a second pilot channel generator for receiving the pilot bits and generating a second pilot channel signal by controlling the gain of the pilot bits with the second gain value and spreading the gain-controlled signal with a second orthogonal code;

an adder for adding the first and second pilot channel signals; and

a channel transmitter for PN-spreading the output signal of the adder, converting the frequency of the PN-spread signal, and transmitting the converted signal.

6. A method of reporting current transmission power to a mobile station by a base station, comprising the steps of:

generating a first gain value and a second gain value according to a current transmission power and a remaining transmission power;

receiving pilot bits;

generating a first pilot signal by controlling the transmission power level of the pilot bits with the first gain value and spreading the gain-controlled signal with a first orthogonal code, and transmitting the first pilot signal; and

generating a second pilot signal by controlling the transmission power level of the pilot bits with the second gain value and spreading the gain-controlled signal with a second orthogonal code, and transmitting the second pilot signal.

7. The method of claim 6, wherein the first and second pilot signals are transmitted continuously in time.

8. The method of claim 6, wherein the first and second pilot signals are transmitted periodically in time.

9. The method of claim 6, wherein a ratio of the transmission power of the second pilot signal to the transmission power of the first pilot signal is the current transmission power.