Sub-frame synchronized residual ranging
First Claim
Patent Images
1. A method of ranging between nodes, the method comprising:
- synchronizing two or more nodes with a frame preamble transmitted from one of the two or more nodes to the other of the two or more nodes;
subsequently exchanging data and ranging schedule between the nodes, including data transmitted from at least one of the other nodes, without transmitting an additional frame preamble from any of the two or more nodes;
starting a ranging schedule clock in each node in response to a switch point; and
exchanging one or more range signals between the nodes based on the ranging schedule during a residual synchronization period, wherein the residual synchronization period is a period of time from the switch point until a second frame preamble is transmitted by one of the two or more nodes.
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Abstract
A method of ranging between nodes is provided. The method includes synchronizing two or more nodes with a frame preamble. Exchanging data and ranging schedule between the nodes without an additional frame preamble. Starting a schedule clock in each node in response to a switch point and exchanging one or more range signals between nodes based on the ranging schedule.
67 Citations
20 Claims
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1. A method of ranging between nodes, the method comprising:
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synchronizing two or more nodes with a frame preamble transmitted from one of the two or more nodes to the other of the two or more nodes; subsequently exchanging data and ranging schedule between the nodes, including data transmitted from at least one of the other nodes, without transmitting an additional frame preamble from any of the two or more nodes; starting a ranging schedule clock in each node in response to a switch point; and exchanging one or more range signals between the nodes based on the ranging schedule during a residual synchronization period, wherein the residual synchronization period is a period of time from the switch point until a second frame preamble is transmitted by one of the two or more nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of communication with a node, the method comprising:
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synchronizing communication with at least one other node with a frame preamble transmitted from the node to the at least one other node, subsequently exchanging data in a frame between the node and the at least one other node without transmitting an additional frame preamble from the node or the at least one other node, the exchanged data including a ranging schedule and data transmitted from the at least one other node; entering into a ranging mode upon detection of a special switch point; implementing a schedule timer when the node is scheduled to receive a range signal; and transmitting range data when scheduled to transmit. - View Dependent Claims (13, 14, 15)
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16. A communication node comprising:
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a transmitter/receiver circuit adapted to selectively transmit and receive communication signals; a synchronization circuit adapted to synchronize the local clock with a first preamble in a received communication signal from at least one other communication node to establish communications between the communication nodes; and a control circuit adapted to control the transmitter/receiver circuit and the synchronization circuit, the control circuit being adapted to process communication signals, the control circuit further adapted to direct transmission and reception of communication signals between the communication nodes without any of the nodes transmitting a second preamble to re-synchronize the local clock until time synchronization suitable for ranging is lost, the control circuit further adapted to enter into a ranging mode during a residual synchronization period and implement a ranging schedule in response to a special switch point, wherein a residual synchronization period is a period of time from the special switch point until a second frame preamble is transmitted; a start clock adapted to clock scheduling operations of the communication node when the communication node enters into the ranging mode; and a range timer adapted to track a time period when the node is scheduled to receive range data. - View Dependent Claims (17, 18, 19, 20)
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Specification