Time stamp replication within a wireless network
First Claim
1. A method comprising:
- receiving an input time stamp at a first wireless station in a wireless network, the wireless network comprising two or more groups of wireless stations;
storing a data pair comprising the received input time stamp and a value associated with a local clock at the first wireless station when the input time stamp was received;
determining an output time stamp from an extrapolation of at least two stored data pairs and a predicted value of the local clock when the output time stamp will be transmitted, wherein each stored data pair comprises an earlier received input time stamp and an earlier value of the local clock at the time the earlier input time stamp was received; and
transmitting a frame comprising the output time stamp to wireless stations within one of the groups.
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Accused Products
Abstract
Time stamp replication within wireless networks is described. In an embodiment, a wireless station receives an input time stamp and uses this input time stamp to generate an output time stamp. The wireless station transmits the output time stamp to wireless stations in one of a number of groups which make up the wireless network. The output time stamp is generated to compensate for delays between receiving the input time stamp and transmitting the output time stamp such that output time stamp which is transmitted at a time T corresponds to the value that the input time stamp would have had if it had been received at time T (and not at a time earlier than T). This may, therefore, reduce or eliminate independent time stamp errors and jitter caused by multiple disparate systems and processes.
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Citations
21 Claims
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1. A method comprising:
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receiving an input time stamp at a first wireless station in a wireless network, the wireless network comprising two or more groups of wireless stations; storing a data pair comprising the received input time stamp and a value associated with a local clock at the first wireless station when the input time stamp was received; determining an output time stamp from an extrapolation of at least two stored data pairs and a predicted value of the local clock when the output time stamp will be transmitted, wherein each stored data pair comprises an earlier received input time stamp and an earlier value of the local clock at the time the earlier input time stamp was received; and transmitting a frame comprising the output time stamp to wireless stations within one of the groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless station comprising:
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a local clock; a first communication interface arranged to receive an input time stamp and to store a data pair comprising the received input time stamp and a value associated with the local clock when the input time stamp was received; a time stamp correction module arranged to determine an output time stamp from an extrapolation of two stored data pairs and a predicted value of the local clock when the output time stamp will be transmitted, wherein each stored data pair comprises an earlier received input time stamp and an earlier value of the local clock at the time the earlier input time stamp was received; and a second communication interface arranged to transmit the output time stamp to wireless stations in one of a plurality of groups in a wireless network. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A non-transitory computer readable storage medium having stored thereon computer readable instructions that, when processed at a computer system for generating a manifestation of an integrated circuit, cause the computer system to generate a manifestation of an integrated circuit comprising:
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a counter; a first communication interface arranged to receive an input time stamp and to store a data pair comprising the received input time stamp and a value of the counter when the input time stamp was received; a time stamp correction module arranged to determine an output time stamp from an extrapolation of two stored data pairs and a predicted value of the local clock when the output time stamp will be transmitted, wherein each stored data pair comprises an earlier received input time stamp and an earlier value of the local clock at the time the earlier input time stamp was received; and a second communication interface arranged to transmit the output time stamp to wireless stations in one of a plurality of groups in a wireless network.
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Specification