Wireless local area network apparatus
AssigneeAgere Systems Inc.
InventorsWilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
Life of this patent
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Abstract
A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.
Claims82
A method of transmitting data from a transmitter having a timer that counts up to n counts and a modem, comprising:
- periodically transmitting a transmission signal that includes a timestamp field,
- the timestamp field including a timestamp for synchronizing a receiver timer with the transmitter timer, wherein the timestamp represents a value within the count sequence of the timer and wherein, the timestamp accounts for delays in the modem.
A method of transmitting data from a transmitter having a timer that performs a count sequence up to n counts, comprising:
- periodically transmitting a transmission signal that includes a header field and a timestamp field, such that the header field is transmitted before the timestamp field, and
- loading, after the transmission of the header field begins, a timestamp into the timestamp field of the transmission signal, wherein the timestamp represents a value m within the count sequence of the timer.
A method of transmitting data from a transmitter in a wireless local area network, comprising:
- periodically constructing, in response to a timer that counts up to n counts, a transmission signal that includes a timestamp field,
- running a protocol to determine whether the network is busy,
- loading a timestamp, based upon a value m of the timer, into the timestamp field of the transmission signal if the running step determines the network is not busy, and
- transmitting the transmission signal containing the timestamp.
A method of transmitting data from a transmitter having a timer that counts up to n counts and a modem, comprising:
- periodically transmitting a transmission signal that includes a header field and a timestamp field, such that the header field is transmitted before the timestamp field, and
- loading, after the transmission of the header field begins, a timestamp into the timestamp field of the transmission signal, the timestamp for synchronizing a receiver timer with the timer, wherein the timestamp is based upon a value m of the timer, the timestamp accounting for delays in the modem.
A method of transmitting data from a transmitter having a timer that counts up to n counts and a modem in a wireless local area network, comprising:
- periodically constructing a transmission signal that includes a timestamp field,
- running a protocol to determine whether the network is busy or free,
- waiting until the protocol determines that the network is free and then loading a timestamp, based upon a value m of the timer, into the timestamp field of the transmission signal, wherein the timestamp is configured for synchronizing a receiver timer with the timer and wherein the timestamp accounts for delays in the modem, and
- transmitting the transmission signal containing the timestamp.
A method of transmitting data from a transmitter having a timer in a wireless local area network, comprising:
- periodically constructing, in response to a timer that counts up to n counts, a transmission signal that includes a header field and a timestamp field, such that the header field is transmitted before the timestamp field,
- running a protocol to determine whether the network is busy,
- transmitting the transmission signal if the running step determines that the network is not busy, and
- loading, after transmission of the header field begins, a timestamp into the timestamp field of the transmission signal, wherein the timestamp represents a value m within a count sequence of the timer.
A transmitter comprising:
- a transmitter timer that counts up to n counts,
- a transmitter modem, and
- a controller controlling the modem to periodically transmit a transmission signal that includes a timestamp field, the timestamp field including a timestamp for synchronizing a receiver timer with the transmitter timer, wherein the timestamp is based upon a value m of the timer, the timestamp accounting for delays in the transmitter modem.
A transmitter, comprising:
- a timer that performs a count sequence up to n counts,
- a controller controlling operation of the transmitter to periodically transmit a transmission signal that includes a header field and a timestamp field, such that the header field is transmitted before the timestamp field, and controls loading, after the transmission of the header field begins, of a timestamp into the timestamp field of the transmission signal, wherein the timestamp represents a value m within the count sequence of the timer.
A transmitter in a wireless local area network, comprising:
- a timer that counts up to n counts, and
- a controller that controls
- periodic construction, in response to the timer, of a transmission signal that includes a timestamp field,
- running a protocol to determine whether the network is busy,
- loading of a timestamp, based upon a value m of the timer, into the timestamp field of the transmission signal if the running step determines the network is not busy, and
- transmission of the transmission signal containing the timestamp.
A transmitter, comprising:
- a transmitter timer that performs a count sequence up to n counts,
- a transmitter modem, and
- a controller controlling periodic transmission of a transmission signal that includes a header field and a timestamp field, such that the header field is transmitted before the timestamp field, and controlling loading, after the transmission of the header field begins, of a timestamp into the timestamp field of the transmission signal, the timestamp for synchronizing a receiver timer with the transmitter timer, wherein the timestamp represents a value m within the count sequence, the timestamp accounting for delays in the transmitter modem.
A transmitter in a wireless local area network, comprising:
- a transmitter timer that counts up to n counts,
- a transmitter modem, and
- a controller controlling
- periodic generation of a transmission signal that includes a timestamp field,
- running of a protocol to determine whether the network is busy or free, and
- loading of a timestamp, based upon a value m of the timer, into the timestamp field of the transmission signal if the running step determines the network is free, wherein the timestamp is useable for synchronizing a receiver timer with the transmitter timer, the timestamp accounting for delays in the transmitter modem.
A transmitter in a wireless local area network, comprising:
- a timer that performs a count sequence up to n counts,
- a controller controlling
- periodic construction of a transmission signal that includes a header field and a timestamp field, such that the header field is transmitted before the timestamp field,
- running of a protocol to determine whether the network is busy, and
- loading, after transmission of the header field begins, of a timestamp into the timestamp field of the transmission signal, wherein the timestamp represents a value m within the count sequence of the timer.
A transmitter in a wireless local area network, comprising:
- a transmitter timer that counts up to n counts,
- a transmitter modem, and
- a controller controlling
- periodic construction of a transmission signal that includes a header field and a timestamp field, such that the header field is transmitted before the timestamp field,
- running of a protocol to determine whether the network is busy, and
- loading of a timestamp into the timestamp field of the transmission signal, wherein the timestamp is useable for synchronizing a receiver timer with the transmitter timer, the timestamp accounting for delays in the transmitter modem.
Dependencies are inferred from the claim text.