Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
1998-03-09
2001-08-07
Ton, Dang (Department: 2661)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S342000
Reexamination Certificate
active
06272119
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method of CDMA radio wave communication and a base station and a mobile station using CDMA system.
2. Description of the Prior Art
A method of CDMA radio wave communication system for providing communication between a base station and a plurality of mobile stations is known. Such a prior art method is disclosed in U.S. Pat. No. 4,841,527. The method for transmitting information includes the steps of initially transmitting information in a code division multiple access channel, a determination for seeing if the information has been correctly received at the transmitter and by inference, by other receivers, and if not, re-transmitting the information with a selected time delay.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide a superior method of CDMA radio wave communication, a superior base station, and a superior mobile station.
According to the present invention, a first method of CDMA radio wave communication is provided which comprises the steps of: generating a first radio wave signal including the steps of: spectrum-spreading first data with a first PN code; and transmitting the spectrum-spread first data from a first place as the first radio wave signal; receiving the first data from the first radio wave signal from the first place at a second place remote from the first place; de-spectrum-spreading the received first data; converting at least a portion of the de-spectrum-spread first data into data-rate converted data having a first data rate; attaching the data-rate-converted data to a second data having a second data rate to output a combined data, the first data rate being higher than the second data rate; spectrum-spreading the combined data with a second PN code; transmitting the spectrum-spread combined data from the second place; receiving the transmitted combined data at the first place; de-spectrum-spreading the received combined data; measuring a first transmission quality of the received combined data at the first place; measuring a second transmission quality of the data-rate-converted data at the first place; and outputting the measured second transmission quality when the first transmission quality is higher than a reference.
The first method may further comprise the step of: storing the first data at the first place, wherein the first transmission quality is measured by detecting a first error rate in the de-spectrum-spreading the third data and the second transmission quality is measured by detecting a second error rate through comparing the stored first data and de-spectrum-spread fourth data.
The first method may further comprise the steps of: averaging the first error rate to obtain the first transmission quality at the first place; and averaging the second error rate to obtain the second transmission quality at the first place.
The first method may further comprise the step of: controlling generating first radio wave signal in accordance with the measured second transmission quality. In this case, controlling generating first radio wave signal is made such that the second transmission quality is increased when the second transmission quality is lower than a second reference and the first transmission quality is higher than the reference at the first place and the transmission efficiency is increased when the second transmission quality is higher than the second reference.
The first method may further comprise the steps of: storing the first data at the first place; reading the first data; and re-transmitting the read first data after the first data is once transmitted by generating the first radio wave signal from the first place when the first transmission quality is higher than the reference and the second transmission quality is lower than a second reference.
The first method may further comprise the steps of: measuring an interval in the condition that the first transmission quality is higher than the reference and second transmission quality is lower than the second reference at the first place; judging whether the interval is longer than a reference value at the first place; and stopping generating the first radio wave signal from the first place when the interval is longer than the reference.
According to the present invention, a first base station is provided, which comprises: a radio wave generation circuit including: a spectrum-spreading circuit for spectrum-spreading a first data with a first PN code; and a transmitting circuit for transmitting the spectrum-spread first data; a receiving circuit for receiving a radio wave including combination data including a second data and data-rate-converted data spectrum-spread with a second PN code from a mobile station, the data-rate-converted data being generated from at least a portion of the first data received by a mobile station, the data-rate-converted data having first data rate higher than a second data rate of the second data; a de-spectrum-spreading circuit for de-spectrum-spreading the received combination data; a first measuring circuit for measuring a first transmission quality of the upward transmission from a mobile station from the combination data from the de-spectrum-spreading circuit; a second measuring circuit for measuring a second transmission quality of the downward transmission to the mobile unit from the data-rate-converted data from the de-spectrum-spreading circuit; and an outputting circuit for outputting the measured second transmission quality when the first transmission quality is higher than a reference.
According to the present invention, a first mobile station is provided, which comprises: a receiving circuit for receiving first data spectrum-spread with a first PN data and transmitted from a base station; a de-spectrum-spreading circuit for de-spectrum-spreading the first data from the receiving circuit with a first PN data; a data-rate-conversion circuit for data-rate-converting at least a portion of the first data from the de-spectrum-spreading circuit to have a second data rate to output data-rate-converted data; an attaching circuit for attaching the data-rate-converted data to second data to output a combination data, a data rate of the data-rate-converted data being higher than a data rate of the second data; a spectrum-spreading circuit for spectrum-spreading the combination data with a second PN code; and a transmitting circuit for transmitting the spectrum-spread combination data.
According to this invention, there is provided a second method of CDMA radio wave communication comprising the steps of: generating a first radio wave signal at a transmission efficiency including: spectrum-spreading first data with a first PN code; and transmitting the spectrum-spread first data from a first place as the first radio wave signal; receiving the first data from the first radio wave signal from the first place at a second place remote from the first place; de-spectrum-spreading the received first data; measuring a first transmission quality of the received first data at the second place to output transmission quality data; attaching the transmission quality data to second data to output a combined data such that the transmission quality data in the combined data is higher than a second data rate of the second data in the combined data; spectrum-spreading the combined data with a second PN code; transmitting the spectrum-spread combined data from the second place; receiving the transmitted combined data at the first place; de-spectrum-spreading the received combined data; measuring a second transmission quality of the de-spectrum-spread combined data in response to the de-spectrum-spreading; extracting the transmission quality data from de-spectrum-spread combined data at the first place; and outputting the fourth data representing the first transmission quality when the second transmission quality is higher than a reference.
In the second method, wherein the first transmission quality is measured by detecting a first error rate of the de-spectrum-spread first d
Connolly Bove Lodge & Hutz
Ton Dang
Vanderpuye Ken
YRP Mobile Telecommunications Key Technology Research Laboratori
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