Positioning based on inter-packet arrival time
AssigneeQUALCOMM Incorporated
InventorsXiaojie Wang, Mohammad Tarek Fahim, Jing Sun, Xiaoxia Zhang
Life of this patent
Estimating the term…
Abstract
Disclosed are techniques for wireless communication. In an aspect, a radio frequency identification (RFID) station may receive a first packet from an RFID tag at a first arrival time. The RFID station may receive a second packet from the RFID tag at a second arrival time after the first arrival time. The RFID station may estimate a distance between the RFID station and the RFID tag based on an inter-packet arrival time between the first packet and the second packet, the inter-packet arrival time being based on a time difference between the first arrival time and the second arrival time.
Claims13
A method of operating a radio frequency identification (RFID) station, the method comprising:
- receiving a first packet from an RFID tag at a first arrival time;
- receiving a second packet from the RFID tag at a second arrival time after the first arrival time;
- determining a mapping relationship based on capability information of the RFID tag that includes:
- an energy harvesting efficiency characteristic of the RFID tag;
- a power consumption level for sending the first packet or the second packet by the RFID tag;
- an accuracy of monitoring an energy level of an energy storage device of the RFID tag by the RFID tag;
- an accuracy of monitoring a signal strength of radio frequency waves from the RFID station by the RFID tag;
- or
- a combination thereof;
- and
- estimating a distance between the RFID station and the RFID tag based on an inter-packet arrival time between the first packet and the second packet and the mapping relationship, the inter-packet arrival time being based on a time difference between the first arrival time and the second arrival time.
A radio frequency identification (RFID) station, comprising:
- at least one memory;
- at least one transceiver;
- and
- at least one processor communicatively coupled to the at least one memory and the at least one transceiver, the at least one processor configured to:
- receive, via the at least one transceiver, a first packet from an RFID tag at a first arrival time;
- receive, via the at least one transceiver, a second packet from the RFID tag at a second arrival time after the first arrival time;
- determine a mapping relationship based on capability information of the RFID tag that includes:
- an energy harvesting efficiency characteristic of the RFID tag;
- a power consumption level for sending the first packet or the second packet by the RFID tag;
- an accuracy of monitoring an energy level of an energy storage device of the RFID tag by the RFID tag;
- an accuracy of monitoring a signal strength of radio frequency waves from the RFID station by the RFID tag;
- or
- a combination thereof;
- and
- estimate a distance between the RFID station and the RFID tag based on an inter-packet arrival time between the first packet and the second packet and the mapping relationship, the inter-packet arrival time being based on a time difference between the first arrival time and the second arrival time.
Dependencies are inferred from the claim text.