TDMA radio communication system
AssigneeNEC Corporation
InventorOsamu Sato
Life of this patent
Estimating the term…
Abstract
A mobile station sends a speech signal to a radio base station or, in the absence of speech signals, sends back a sync signal from the radio base station. The radio base station detects whether the signal received from the mobile station is a speech signal or the sync signal it sent. If a speech signal is received, it performs usual processing for speech signals or, if the sync signal is received, judges the line quality according to this sync signal.
Claims17
A TDMA radio communication system whereby a radio base station and a mobile station transmit to and receive from each other digital speech signals over a radio line consisting of a plurality of time-division-multiplexed time slots, said mobile station comprising:
- extracting means for extracting a first sync signal from signals received from said radio base station;
- detecting means for detecting the presence or absence of transmit speech signals;
- and
- sending means for sending said first sync signal to said radio base station in the absence of said transmit speech signals, and sending said transmit speech signals to said radio base station in the presence of said transmit speech signals.
A TDMA radio communication system whereby a radio base station and a mobile station transmit to and receive from each other digital speech signals over a radio line consisting of a plurality of time-division-multiplexed time slots, said radio base station comprising:
- transmitting means for transmitting a first sync signal;
- first receiving means for receiving said first sync signal returned from said mobile station;
- and
- judging means for judging the quality of said radio line according to said first sync signal.
In a TDMA radio communication system whereby a radio base station and a mobile station transmit to and receive from each other digital speech signals over a radio line consisting of a plurality of time-division-multiplexed time slots, a method for controlling transmission from said mobile station comprising the steps of:
- detecting the presence or absence of transmit speech signals;
- and
- sending a sync signal received from said radio base station in the absence of said transmit speech signals and, in the presence of said transmit speech signals, sending said transmit speech signals.
In a TDMA radio communication system whereby a radio base station and a mobile station transmit to and receive from each other digital speech signals over a radio line consisting of a plurality of time-division-multiplexed time slots, a method for controlling transmission from said radio base station, comprising the steps of:
- receiving signals from said mobile station;
- judging whether or not said signals indicate a silent period, and
- judging, if they indicate a silent period, the line quality according to a first sync signal from said radio base station, contained in said signals or, if they do not indicate a silent period, processing speech signals contained in said signals.
Dependencies are inferred from the claim text.