Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
1997-10-03
2001-05-15
Olms, Douglas W. (Department: 2732)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S519000
Reexamination Certificate
active
06233257
ABSTRACT:
TECHNICAL FIELD
The present invention relates to the field of wireless telecommunications. More specifically, the present invention relates to providing an automatic transmission distance time delay setting within a wireless local loop system.
BACKGROUND ART
Within the field of wireless telecommunications systems there exists a system referred to as a wireless local loop system, otherwise known as WLL. The wireless local loop system is functionally designed to provide two way wireless communication to its users. A radio communication interface is utilized to enable personal stations and base stations to communicate with each other within the wireless local loop system.
One type of radio communication interface utilized within a wireless local loop system is the radio interface used within the personal handy phone system (PHS). When the transmission distance between a base station and a personal station is 300 meters or less within the radio interface of the personal handy phone system, the transmission time delay attributed to the distance can be ignored. But within the wireless local loop system, distances up to 7 kilometers can exist between a base station and a personal station which leads to transmission distance delays that should not be ignored. Transmission distance delays that occur within the wireless local loop system are compensated for within the personal station once the large transmission distance is determined. Every 651 meters of distance beyond the usual 300 meters contributes roughly 2.6 microseconds of unwanted delay.
The wireless local loop system has a disadvantage associated with the process of determining the value of the transmission distance time delay that exists between a specific personal station and its corresponding base station. The problem with the conventional process of the wireless local loop system for determining the value of the transmission distance time delay between a base station and a specific personal station is that it is performed manually. Specifically, when a technician of a network provider installs a personal station within a telephone subscriber's residence or office that is located a great distance from a base station, the technician manually measures the transmission distance that exists between the base station and that specific personal station. The technician then translates the measured transmission distance into a corresponding transmission time delay value that is compensated for within the personal station. The disadvantages associated with manually measuring the transmission distance is that (1) it requires a person to perform the actual measurement and this measurement can be error-prone and (2) it is a time consuming process. If the measurement is performed incorrectly, voice/data communication has degraded quality or will not function at all.
Therefore, it would be advantageous to provide a method and system within the wireless local loop system for determining the transmission distance time delay that exists between a base station and a personal station without manually measuring the transmission distance. Without manual measurements, the delay periods can be more accurately and efficiently measured. The present invention provides this advantage.
DISCLOSURE OF THE INVENTION
The present invention includes a method and system that performs a determination of the transmission distance time delay that exists between a base station and a personal station within a wireless local loop system. The present invention performs this determination by employing the communication interface that is utilized between the base station and the personal station. Transmission distance time delay is significant when large transmission distances (e.g., over 300 meters) are located between base stations and personal stations. Once the transmission distance time delay between a base station and a personal station is known, the personal station can compensate for it.
Specifically, the method and system of the present invention directs a base station to transmit a control signal to a personal station. The personal station receives the control signal and then transmits a data signal back to the base station. The base station receives the data signal and determines if it started to receive the data signal later than it expected the data signal to arrive, assuming the two stations were very close in proximity. If the data signal was received by the base station when it was expected to arrive, the base station discontinues determining the transmission distance time delay because no significant transmission delay exists between it and the personal station. If the data signal was received by the base station later than it was expected to arrive, the base station is directed to calculate the time difference between the expected moment in time that the data signal should have started to arrive from the personal station and the actual moment in time the data signal began to arrive. The time difference is equal to the transmission distance time delay attributed to the large distance between the base station and the personal station.
The base station transmits the transmission distance time delay to the personal station once it is determined. The personal station receives and stores the transmission distance time delay value in order to compensate for it.
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Archambaud Denis
Feyfant Patrick
Gaglione Philippe
Martin Varenka
Weigelt Oliver
Olms Douglas W.
Vanderpuye Ken
VLSI Technology Inc.
Wagner , Murabito & Hao LLP
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