Embedded loop delay compensation circuit for multi-channel transceiver

A method of computing respective relative propagation delays between a base station controller and a plurality of base stations in a communications system comprising:

• transmitting a message signal from the base station controller to each of the base stations over respective communication links;
• receiving the message at each base station and each base station returning the message to the base station controller;
• receiving the returned messages at the base station controller;
• determining which base station to base station controller link has the greatest propagation delay;
• and
• comparing the propagation delay of each link with the link having the greatest delay.

A method of compensating for different propagation delay times between a base station controller and a plurality of base stations in a communications network comprising:

• transmitting a common HDLC timing message from said base station controller to each of said base stations over respective communication links;
• returning the timing message from each base station to the base station controller;
• determining the respective round trip propagation time from the base station controller to each of said base stations;
• and
• adding a delay component to a timing signal for each link based on said respective round trip propagation times whereby each base station receives a synchronized time stamp.

A system for measuring propagation delay between nodes in a communications network comprising:

• a transmitter at a first node for transmitting a loop delay measurement signal from said first node to a second node over a communication link;
• a receiver at said second node for receiving the measurement signal at said second node and returning the signal to the first node together with an embedded value of a turn around delay time determined at said second node;
• receiving means at the first node for receiving the measurement signal and embedded turn around time;
• and
• calculation means at the first node for calculating the propagation delay by measuring the total delay time less the turn around time.

A system for computing respective relative propagation delays between a base station controller and a plurality of base stations in a communications system comprising:

• a transmitter at the base station controller for transmitting a message signal from the base station controller to each of the base stations over respective communication links;
• a receiver at each base station for receiving the message at each base station and for returning the message to the base station controller;
• receiving means at the base station controller for receiving the returned message;
• determining means at the base station controller for determining which base station to base station controller link has the greatest propagation delay;
• and
• means to compare the propagation delay of each link with the link having the greatest delay.

A system for compensating for different propagation delay times between a base station controller and a plurality of base stations in a communications network comprising:

• a transmitter at said base station controller for transmitting a common HDLC timing message from said base station controller to each of said base stations over respective communication links;
• means at each base station for returning the timing message from each base station to the base station controller;
• determining means at said base station controller for determining the respective round trip propagation time from the base station controller to each of said base stations;
• and
• delay means for adding a delay component to a timing signal for each link based on said respective round trip propagation times whereby each base station receives a synchronized time stamp.