Apparatus and method for controlling communications based on moving speed

• US 6,711,384 B2
• Filed: 09/03/2002
• Issued: 03/23/2004
• Est. Priority Date: 02/03/1998
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kubo, Tokuro, Minowa, Morihiko
• Primary Examiner(s): Nguyen, Lee
• Application Number:
  US10/233,789
• Publication Number:
  US 20030003914A1
• Time in Patent Office: 567 Days
• Field of Search: 455/441, 455/504, 455/506, 455/69, 455/522, 455/68, 455/238.1, 375/134, 375/137, 375/142-147, 375/140, 375/150, 342/104, 342/105, 342/108
• US Class Current: 455/68
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence

Abstract

A communication control apparatus installed in a base station or a mobile station in mobile communications system estimates the relative moving speed of an opposing station, and adjusts the values of communication parameters for a searcher, a transmission power control unit, an absolute synchronous detector unit, etc. according to an obtained moving speed.

Claims

1. A communication control apparatus for controlling a parameter of spread spectrum communication for mobile communications between a transmitting station and a receiving station, comprising:

a speed estimating unit estimating a moving speed of one of said transmitting station and said receiving station and outputting a control signal corresponding to the estimated moving speed; and

a modifying unit modifying a value of said parameter based on said control signal, wherein

said transmitting station includes a transmission power controlling unit modifying a transmission power;

said modifying unit controls a parameter in a modifying operation performed by said transmission power controlling unit as said parameter based on said control signal; and

said modifying unit controls a frequency of the transmission power controlling unit modifying a power value as said parameter in the modifying operation based on said control signal.

2. The communication control apparatus according to claim 1, wherein

said modifying unit further controls a variable width of a power value modified by the transmission power controlling unit as said parameter in the modifying operation based on said control signal.

3. The communication control apparatus according to claim 2, wherein

said transmission power controlling unit comprises an accumulating unit accumulating transmission power control commands transmitted from said receiving station, and a converting unit converting the accumulated value to the power value, and

said modifying unit further controls the accumulated value of the transmission power control commands based on said control signal.

4. A transmitter comprising:

a speed estimating unit estimating a moving speed of a receiving station in mobile communications and outputting a control signal corresponding to the estimated moving speed; and

a modifying unit modifying a value of a parameter of spreading spectrum communication for said mobile communications based on said control signal, wherein

said modifying unit controls a parameter in a modifying operation for modifying a transmission power as said parameter; and

said modifying unit controls a frequency of modifying a power value as said parameter in the modifying operation based on said control signal.

5. A transmitter, comprising:

a speed estimating unit for estimating a moving speed of a receiving station in mobile communications and outputting a control signal corresponding to the estimated moving speed; and

modifying means for modifying a value of a parameter for said mobile communications based on said control signal, wherein

said modifying means controls a modification frequency of a power value in a transmission power control as said parameter based on said control signal.

6. The transmitter according to claim 5, wherein

said modifying means further controls a variable width of a power value as said parameter based on said control signal.

7. A communication control method, comprising the steps of:

performing mobile communications between a transmitting station and a receiving station;

estimating a moving speed of one of said transmitting station and receiving station; and

modifying a value of a parameter of spread spectrum communication for said mobile communications based on the estimated moving speed; and

controlling at least one of frequency of a search operation for detecting a timing for despreading a spread spectrum signal, the number of accumulation additions of receiving correlation values in the search operation, the number of pilot signals used to perform a coherent detection, a weight coefficient of a pilot signal and an observation length for observing a signal in an invalid path detection, and a modification frequency of a power value in the transmission power control as said parameter based on said estimated moving speed.

8. The communication control method according to claim 7 wherein,

the controlling step includes controlling a variable width of a power value in a transmission power control as said parameter in the modifying operation based on said estimated moving speed.

9. A communication control method, comprising the steps of:

performing mobile communications between a transmitting station and said receiving station;

estimating a moving speed of one of said transmitting station and said receiving station;

modifying a value of a parameter of spread spectrum communication for said mobile communications based on the estimated moving speed; and

controlling a parameter in at least one or more of a search operation for detecting a timing for despreading a spread spectrum signal, a detecting operation for detecting a signal including a pilot signal, a detecting operation for detecting an invalid path and a modifying operation for modifying a transmission power as said parameter of spread spectrum, wherein,

the controlling step includes controlling a frequency of modifying a power value as said parameter in the modifying operation based on said estimated moving speed.