Abstract: A ranging operation between an initiator device and a responder device may be performed by receiving, from the initiator device, a data frame including a request for the responder device to report its actual Short Interframe Space (SIFS) duration to the initiator device; creating a response frame; determining the actual SIFS duration based on the received data frame and the response frame; embedding SIFS information indicative of the actual SIFS duration of the responder device into the response frame; and sending the response frame to the initiator device.

Abstract: A ranging operation between a first wireless device and a second wireless may be performed by: sending, to the second wireless device, a data frame including a request for the second wireless device to report its actual SIFS duration to the first wireless device; determining a time of departure (TOD) of the data frame; receiving, from the second wireless device, a response frame including SIFS information indicative of the actual SIFS duration of the second wireless device; determining a time of arrival (TOA) of the response frame; and determining a round trip time (RTT) of the data frame and the response frame using the TOD of the data frame, the TOA of the response frame, and the actual SIFS duration of the second wireless device.

Abstract: Disclosed are implementations that include a method, performed by a network control device, including sending a first instruction to a first device to send a first measurement signal, and sending a second instruction to a second device to receive the first measurement signal. Following receipt of a first acknowledgement signal from the target mobile device, the first and second devices change their roles so the second device sends, and the first device receives, a second measurement signal, and the first and second devices receive a second acknowledgement signal from the target device. Position of the target device is determined based on timing measurements associated with the first and second measurement signals, the first and second acknowledgement signals, and on known positions of the first and second devices. Another network device is selected to perform additional measurements upon a determination that a desired accuracy of the position determined was not achieved.

Abstract: Disclosed is a system, apparatus, computer readable storage medium, and method to perform a bandwidth efficient network based positioning (NBP). A positioning request for a mobile device is received within an environment, the environment comprising one or more access points (APs). An AP coverage area including the mobile device is determined. A NBP load for the AP is measured, wherein the NBP load comprises a direct NBP load and an indirect NBP load. If the NBP load is less than a threshold, the AP is instructed to process the first positioning request. Multiple APs may process positioning requests concurrently and positioning requests may be scheduled according to timeout and/or relative expiration.

Abstract: Systems, methods, and devices enable group associations based on network determined location information. The various embodiments enable the ad-hoc creation of mobile device groups based on network determined locations. In an embodiment, a server may determine the location of a mobile device and based on the mobile device being located in a pairing zone may add the mobile device to a group. In an embodiment, the server may add the mobile device to the group following the occurrence of a trigger event, such as the mobile device pausing in a given pairing zone for a period of time. In an embodiment, the server may identify that mobile devices are located within a pairing zone and may add all the mobile devices in the pairing zone to the same group.

Abstract: A method for network-based positioning of a mobile device as described herein includes selecting a first set of access points (APs) to take first positioning measurements from the mobile device; obtaining the first positioning measurements from the first set of APs; selecting, based on the first positioning measurements, a second set of APs to take second positioning measurements from the mobile device; obtaining the second positioning measurements from the second set of APs; and determining a location of the mobile device based on the first positioning measurements and the second positioning measurements.

Abstract: Methods, systems, computer-readable media, and apparatuses are presented for excluding peer-to-peer mobile device signal data from a heat map. In response to receiving an identifier of a mobile device in a peer-to-peer network group, a server may generate resultant data by excluding data associated with a signal generated by the mobile device from data used to generate a heat map. The server can generate the heat map using the resultant data.

Abstract: Methods, systems, computer-readable media, and apparatuses are presented for determining positions of mobile devices in a peer-to-peer network group. In some embodiments, a server receives information regarding a distance between a group owner mobile device and a client mobile device in a peer-to-peer network group. The server determines whether the distance between the group owner mobile device and the client mobile device exceeds a threshold distance. If the threshold distance is not exceeded, the server associates a position of the group owner mobile device with a position of the client mobile device.

Abstract: Mobile devices implement a ranging mechanism that includes a lead responder receiving ranging measurement requests from two different initiators in the same DW cycle. At the beginning of the DW cycle the lead responder broadcasts and/or publishes a channel availability map that includes a list of slots and channels in which to respond to the ranging measurement requests based on a number of ranging operations supported in each slot within the DW cycle and based on an autonomously determined response sequence. If the lead responder responds to all ranging requests by all initiators in a DW cycle, secondary responders can perform ranging in the same or subsequent DW cycles. Upon exhausting all initiators paired with the lead responder, a secondary responder becomes the “active” responder that is chosen based on a prioritization scheme that is universal among the group of devices in the ranging operation.

Abstract: Methods and apparatuses are disclosed that may perform simultaneous ranging operations between a requester device and each of a plurality of target devices using OFDMA-based frame exchanges while maintaining a level of accuracy comparable to ranging operations that do not use OFDMA-based frame exchanges. Tone interleaving may be used so that the ranging devices may estimate channel conditions for the full frequency spectrum of the wireless medium. For example, a unique set of two or more non-adjacent groups of OFDM sub-carrier frequencies may be allocated to each of the plurality of target devices for ranging operations.

Abstract: A ranging operation between a first wireless device and a second wireless may be performed by: sending, to the second wireless device, a data frame including a request for the second wireless device to report its actual SIFS duration to the first wireless device; determining a time of departure (TOD) of the data frame; receiving, from the second wireless device, a response frame including SIFS information indicative of the actual SIFS duration of the second wireless device; determining a time of arrival (TOA) of the response frame; and determining a round trip time (RTT) of the data frame and the response frame using the TOD of the data frame, the TOA of the response frame, and the actual SIFS duration of the second wireless device.

Abstract: Methods and systems are presented for updating assistance data in an indoor navigation system. In some embodiments, a method includes receiving ranging measurements from a reference positioning terminal, computing an estimated location of the reference positioning terminal based on the received ranging measurements, receiving information associated with a high-confidence location of the reference positioning terminal, determining that a difference between the estimated location and the high-confidence location of the reference positioning terminal is greater than a predetermined threshold, and sending an assistance data update to a server associated with the indoor navigation system, the assistance data update including an update to assistance data based on the received ranging measurements of the reference positioning terminal.

Abstract: Example methods, apparatuses, or articles of manufacture are disclosed herein that may be utilized, in whole or in part, to facilitate or support one or more operations or techniques for leveraging wireless communication traffic opportunistically, such as within an indoor or like environment, for example, for use in or with a mobile communication device.

Abstract: Disclosed is a system, apparatus, computer readable storage medium, and method to perform a bandwidth efficient network based positioning (NBP). A positioning request for a mobile device is received within an environment, the environment comprising one or more access points (APs). An AP coverage area including the mobile device is determined A NBP load for the AP is measured, wherein the NBP load comprises a direct NBP load and an indirect NBP load. If the NBP load is less than a threshold, the AP is instructed to process the first positioning request. Multiple APs may process positioning requests concurrently and positioning requests may be scheduled according to timeout and/or relative expiration.

Abstract: Techniques for controlling transmit (Tx) power of an access point (AP) in a wireless communication system are described herein. An example of a method described herein includes detecting that a positioning exchange between an AP and a mobile device has been initialized; determining an estimated coverage area of the mobile device, an estimated Tx power level of the mobile device, and/or other operating parameters of the mobile device; and controlling a power level used by the AP for transmissions to the mobile device during the positioning exchange based on the determined operating parameters of the mobile device.

Abstract: Methods, systems, computer-readable media, and apparatuses for determining a location for a wireless communication device using an integrated WiFi sniffer and measurement engine are presented. The method includes utilizing a first WiFi transceiver and a second WiFi transceiver. Data communications or positioning communications can be transmitted and received on either of the first and the second WiFi transceivers, or both.

Abstract: Disclosed are implementations that include a method, performed by a network control device, including sending a first instruction to a first device to send a first measurement signal, and sending a second instruction to a second device to receive the first measurement signal. Following receipt of a first acknowledgement signal from the target mobile device, the first and second devices change their roles so the second device sends, and the first device receives, a second measurement signal, and the first and second devices receive a second acknowledgement signal from the target device. Position of the target device is determined based on timing measurements associated with the first and second measurement signals, the first and second acknowledgement signals, and on known positions of the first and second devices. Another network device is selected to perform additional measurements upon a determination that a desired accuracy of the position determined was not achieved.

Abstract: Bluetooth file transfers using FTP do not provide upper-layer reliability checking and rely on the Bluetooth device physical layer providing reliable data to upper layers of a Bluetooth stack. However, reliability checks implemented by the physical layer are typically not very robust and in some cases may fail to detect errors, thus may provide corrupted data to the upper layers for further processing and may result in data corruption/transfer failure. Non-FTP Bluetooth file transfers are typically more robust when it comes to reliability checking because of upper layer reliability checks. Functionality can be implemented to vary packet transmission parameters depending on a Bluetooth profile implemented on a communication link. A packet error rate of received packets can be compared against a different set of thresholds depending on whether the Bluetooth profile is an FTP profile. Appropriate values of packet transmission parameters can be selected based on the above comparison.

Abstract: A method of determining a position of a target device includes: sending a first measurement signal from a first known-position device; receiving the first measurement signal at a second known-position device; receiving a first acknowledgement signal from the target device at the first known-position device and at the second known-position device; determining the position of the target device using first timing information associated with the first measurement signal and the first acknowledgement signal, a first position of the first known-position device, and a second position of the second known-position device.

Abstract: A method for network-based positioning of a mobile device as described herein includes selecting a first set of access points (APs) to take first positioning measurements from the mobile device; obtaining the first positioning measurements from the first set of APs; selecting, based on the first positioning measurements, a second set of APs to take second positioning measurements from the mobile device; obtaining the second positioning measurements from the second set of APs; and determining a location of the mobile device based on the first positioning measurements and the second positioning measurements.