Methods and systems for a ranging protocol
AssigneeQUALCOMM Incorporated
InventorsSantosh Vamaraju, Carlos Horacio Aldana
Life of this patent
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Abstract
Disclosed are methods, systems and devices for obtaining a range between devices based, at least in part, on an exchange of wireless messages. For example, wireless devices may obtain measurements of range based, at least in part, on an exchange fine timing measurement (FTM) messages. In one implementation, a subsequent FTM message transmitted in response to an FTM request message may comprise at least one field indicating a time of transmission of a previous FTM message and a time of receipt of an acknowledgement message transmitted in response to the previous FTM message.
Claims24
A method, at a responding STA, comprising:
- receiving a fine timing measurement (FTM) request message from an initiating STA;
- and
- transmitting at least a subsequent FTM message to the initiating STA in response to the FTM request message, the subsequent FTM message comprising at least one field indicating a time of transmission of a previous FTM message and a time of receipt of an acknowledgement message transmitted in response to receipt of the previous FTM, the at least one field comprising a common portion indicative of most significant portions of the time of transmission of the previous FTM message and the time of receipt of the acknowledgement message, a first fractional portion indicative of the time of transmission of the previous FTM message and a second fraction portion indicative of the time of receipt of the acknowledgement message.
A responding wireless station (STA), comprising:
- a wireless transceiver;
- and
- a processor coupled to the wireless transceiver, the processor configured to:
- obtain a fine timing measurement (FTM) request message received at the wireless transceiver from an initiating STA;
- and
- initiate transmission of at least a subsequent FTM message through the wireless transceiver to the initiating STA in response to the FTM request message, the subsequent FTM message comprising at least one field indicating a time of transmission of a previous FTM message and a time of receipt of an acknowledgment message transmitted in response to receipt of the previous FTM message, the at least one field comprising a common portion indicative of most significant portions of the time of transmission of the acknowledgement message and the time of transmission of the initial FTM message, a first fractional portion indicative of the time of transmission of the previous FTM message and a second fraction portion indicative of the time of receipt of acknowledgement message.
A responding wireless station (STA) comprising, comprising:
- means for obtaining a fine timing measurement (FTM) request message received from an initiating STA;
- and
- means for initiating transmission of at least a subsequent FTM message to the initiating STA in response to the FTM request message, the subsequent FTM message comprising at least one field indicating a time of transmission of a previous FTM message and a time of receipt of an acknowledgement message transmitted in response to receipt of the previous FTM message, the at least one field comprising a common portion indicative of most significant portions of the time of transmission of the previous FTM message and the time of receipt of the acknowledgement message, a first fractional portion indicative of the time of transmission of the previous FTM message and a second fractional portion indicative of the time of receipt of the acknowledgement message.
A non-transitory storage medium comprising computer readable instructions stored thereon which are executable by a processor of a first wireless transceiver device to:
- obtain a fine timing measurement (FTM) request message received at the wireless transceiver from a second wireless transceiver device;
- and
- initiate transmission of at least a subsequent FTM message to the second wireless transceiver device in response to the FTM request message, the subsequent FTM message comprising at least one field indicating a time of transmission of a previous FTM message and a time of receipt of an acknowledgement message transmitted in response to receipt of the previous FTM message, the at least one field comprising a common portion indicative of most significant portions of the time of transmission of the previous FTM message and the time of receipt of the acknowledgement message, a first fractional portion indicative of the time of transmission of the previous FTM message and a second fractional portion indicative of the time of receipt of the acknowledgement message.
Dependencies are inferred from the claim text.