Communications apparatus, communications system, and communications method

• US 20050152438A1
• Filed: 12/06/2004
• Published: 07/14/2005
• Est. Priority Date: 01/13/2004
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Technology Corporation (Renesas Electronics Corporation)
• Inventors: Mizugaki, Kenichi, Fujiwara, Ryosuke
• Granted Patent: US 7,672,362 B2
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/46 in multi hop networks, e.g. wireless relay networks

Abstract

A communications apparatus which ensures a predetermined communication quality even when an external environment changes dynamically, and enhances a throughput for overall system, thereby achieving favorable transmission efficiency. A communications apparatus having a receiver and a transmitter and carries out sending/receiving by use of a pulse train is provided with a communication environment measuring section to measure a communication status based on an output from the receiver. The transmitter is configured such that it transmits a transmission signal, in which the transmission rate of data to be transmitted and the pulse energy have been controlled in association with each other, according to a result of the measurement.

Claims

1. A communications apparatus which carries out information transmission by use of a pulse train, comprising:

a receiver which receives a predetermined signal,

a communication environment measuring means which measures a communication environment status based on a received signal from said receiver, and

a transmitter having a control means which performs a transmission rate control of said pulse train and a single pulse transmission energy control, based on a result of measurement from said communication environment measuring means, wherein

said transmitter transmits said pulse train which has been controlled by said control means.

2. The communications apparatus according to claim 1, wherein

said control means performs said transmission rate control of said pulse train in association with said single pulse transmission energy control, so that an average transmission energy is set to be equal to or less than a predetermined value.

3. The communications apparatus according to claim 1, wherein

said communication environment status to be measured is at least one of the followings as to said received signal;

a status of signal power, a status of signal-to-noise ratio, a status of error rate of received data, and a status of background noise power.

4. The communications apparatus according to claim 1, wherein

said transmitter carries out a transmission of said pulse train having controlled by said control means, which started controlling in response to a predetermined control signal which has been received.

5. The communications apparatus according to claim 1, wherein

said communication environment measuring means includes a detecting means to detect a predetermined signal, and said transmitter starts transmitting said pulse train having been controlled by said control means, according to a result of detection from said detecting means.

6. A communications system comprising a first communications apparatus and at least one second communications apparatus, and carrying out communications through sending/receiving a pulse train, wherein

said first communications apparatus includes a first receiver which receives said pulse train;

a communication environment measuring means which measures a communication environment status based on the received signal from said first receiver,

a control signal generating means which generates a control signal based on a result of measurement in said communication environment measuring means, and

a first transmitter which transmits said control signal to said second communications apparatus, and wherein

said second communications apparatus includes a second receiver which receives said control signal transmitted from said first communications apparatus, and

a second transmitter which is provided with a control means which performs a transmission rate control of said pulse train and a single pulse transmission energy control according to said control signal received from said second receiver, and

said second transmitter transmits said pulse train having been controlled by said control means to said first communications apparatus.

7. The communications system according to claim 6, wherein

said control means performs said transmission rate control of said pulse train in association with said single pulse transmission energy control, so that an average transmission energy is set to be equal to or less than a predetermined value.

8. A communications method which carries out sending/receiving by use of a pulse train, comprising the steps of:

receiving a predetermined signal,

measuring a communication environment based on said predetermined signal received by said receiving step,

controlling a transmission rate of said pulse train and a single pulse transmission energy according to a result of measurement in said measuring step, and

transmitting said pulse train which has been controlled.

9. The communications method according to claim 8, wherein

said control step performs said transmission rate control of said pulse train in association with said single pulse transmission energy control, so that an average transmission energy is set to be equal to or less than a predetermined value.

10. A communications method comprising a first communications apparatus and at least one second communications apparatus, and carrying out communications through sending/receiving a pulse train, wherein

said first communications method includes a first receiving step which receives a predetermined signal,

a measuring step which measures a communication environment based on said signal thus received,

a control signal generating step which generates a control signal based on a result of measurement in said measuring step, and

a first transmission step which transmits said control signal to said second communications apparatus, and wherein

said second communications method includes,

a second receiving step which receives said control signal transmitted from said first communications apparatus,

a control step which performs a transmission rate control of said pulse train and a single pulse transmission energy control according to said control signal received in said second receiving step, and

a second transmitting step which transmits said pulse train having been controlled in said control step to said first communications apparatus.