Abstract: An apparatus and a method are provided for data transmission and reception of a mobile terminal, which seamlessly provide data transmission and reception between the mobile terminal and a multipoint communication device. The method includes requesting, by the mobile terminal, data sharing from another mobile terminal, for sharing of data transmitted and received to and from the another mobile terminal; receiving approval of the request for the data sharing from the another mobile terminal; establishing a channel connection between the mobile terminal and a sharing device for the sharing of the data; and transmitting and receiving the data to and from the sharing device through the channel.

Abstract: A communication device performs communication over a communication path configured in a network, includes: a communication path identification section that can identify a communication path to which a received packet belongs; and a switching section that can forward the received packet to a network node associated with the communication path to which the received packet belongs, among multiple network nodes that can terminate the communication path.

Abstract: Providing for virtual management of wireless resources in a mobile communication environment is described herein. By way of example, access terminals in the communication environment can maintain connections with nearby network transmitters and report factors pertinent to wireless scheduling to a central entity, such as a macro base station. The macro base station can employ those factors in improving wireless communications for other serving cells within or near to a macro coverage area served by the macro base station. By maintaining information pertinent to prevailing wireless conditions, quality of service requirements, pilot signal reports, mobility management considerations, and so on, of transmissions within the cell, significant interference reduction can be implemented for the macro coverage area, or nearby coverage areas.

Abstract: A terminal device includes a memory, and a processor coupled to the memory and configured to execute scanning for a wireless signals at a first frequency for a first time period after the terminal device changes from a stationary state to a movement state or for a second time period after the terminal device changes from the movement state to the stationary state, and stop the scanning or execute the scanning at a second frequency lower than the first frequency after the first time period has elapsed or after the second time period has elapsed.

Abstract: Embodiments of the present invention disclose a method for selecting a target cell and a terminal, comprising: acquiring, by a terminal, signal strengths of a serving cell and signal strengths of neighboring cells according to a predetermined time period; determining a candidate target cell set, where the candidate target cell set includes neighboring cells whose first strength parameters are greater than a first strength parameter of the serving cell at a specific moment; detecting signal change trends, which are within a predetermined time length before the specific moment, of the neighboring cells in the candidate target cell set; determining that a neighboring cell in a set of neighboring cells whose signal change trends satisfy a first state in the candidate target cell set is a target cell, where the first state is a stable trend and/or an ascending trend; and reselecting the target cell as a serving cell.

Abstract: A communication apparatus may receive a first wireless profile and a second wireless profile from an access point after a wireless connecting operation for establishing a wireless connection in accordance with a predetermined wireless connection scheme has been performed, the first wireless profile being used in a first wireless network, and the second wireless profile being used in a second wireless network; may select a particular wireless profile from among the first wireless profile and the second wireless profile, the particular wireless profile being used in a wireless network having a relatively high security level among the first wireless network and the second wireless network; and may try to establish the wireless connection with the access point using the particular wireless profile. The particular wireless connection scheme may be a scheme for establishing the wireless connection without an identifier for authentication for establishing the wireless connection being inputted.

Abstract: A system and method for managing subscriber mobile devices comprising: a home network (400) of a first mobile network operator (MNO1), in which data associated with at least one physical SIM of a subscriber device with an embedded SIM card (eUICC) is obtained, and a destination network (300) of a second mobile network operator (MNO2) which the device travels to, obtaining static data and dynamic data associated with at least one virtual SIM (503, 603) of the device. The dynamic data comprise a subscriber authentication key (Ki) and is obtained from a SIM provider platform (500, 600) on which the destination network (300) relies. The static data comprise IMSI/MSISDN identities and is stored in a pool (202) of the destination network (300). For a given virtual SIM, it is checked whether there is an association in a mapping table (106) of the first mobile network operator (MNO1) between the static data from the pool (202) and the physical SIM data from the home network (400).

Abstract: A communication system, method, and components are described. Specifically, a communication system having the ability to facilitate a semi-attended transfer in SIP for an IP-Multimedia Subsystem (IMS) environment is disclosed. The semi-attended transfer is possible even though one or more Back-to-Back User Agents are positioned between users engaged in the semi-attended transfer.

Abstract: An apparatus and method for allocating a data flow based on selection criteria including receiving at least one policy including at least one indication for selecting an access from two or more of available accesses; determining a selection criterion based on the data flow; and selecting the access based on the determined selection criterion and the at least one indication. In one example, the selection criterion is one of the following: a bandwidth requirement for the data flow, an application generating the data flow, a protocol used to carry the data flow, a file size, an application name/ID, a role ID, or a throughput of the data flow. In one example, the policy is a management object (MO) received from an Access Network Discovery and Selection Function (ANDSF) module and the selected access is for a wireless local area network (WLAN), a LTE network or for a 3GPP service.

Abstract: In some implementations, a computing device may determine a location of the computing device. The computing device may have an associated first phone number. The computing device may determine that the location of the computing device is outside a geographic area in which a carrier associated with the first phone number provides service. The computing device may send a registration request to a local network indicating that the computing device is operating in an over the top mode. The computing device may originate an outgoing call from the computing device. The outgoing call appears to a called party to originate from a second phone number that is different from the first phone number.

Abstract: A communication system is described in which mobile telephones are able to roam between neighboring home node base stations and in which the home base stations or the home base station gateway devices are arranged to aggregate “Unsuccessfully Transmitted DL Data Volume” determined by previous home base stations served by the gateway device. In this way, when a call is transferred away from the gateway device or is released, a total aggregated value of “Unsuccessfully Transmitted DL Data Volume” can be provided to the core network for billing purposes.

Abstract: A method for controlling wireless communication access by wireless devices to wireless communications networks includes establishing, using an intelligent network access controller, one or more targeted coverage areas overlaying portions of a wireless communications network; determining a location of a wireless device relative to a targeted coverage area; locking the wireless device to the intelligent network access controller when the wireless device is located in or near the targeted coverage area; determining an access category for the wireless device; preventing wireless communication access for a first category of wireless devices by maintaining the first category wireless devices locked to the intelligent network access controller; and allowing unlimited wireless communications for a second category of wireless devices, wherein the intelligent network access controller directs the second category wireless devices to attempt registration with the wireless communications.

Abstract: A display method and apparatus for a mobile terminal are disclosed. In the method, traffic display identifiers are set corresponding to different wireless local area network traffic conditions of the mobile terminal, and a traffic display identifier is displayed corresponding to the current wireless local area network traffic condition of the mobile terminal. The schemes can truly display the current wireless local area network traffic condition of the mobile terminal in real time, thereby improving the validity and authenticity of displaying the wireless local area network traffic and facilitating the improvement of the user experience.

Abstract: An example method is provided in one example embodiment and may include determining a presence of user equipment (UE) in relation to small cell radio(s) of a small cell network based on information obtained through the small cell network and one or more parallel networks; and adjusting transmit power for the small cell radio(s) based on the presence of UE in relation to the small cell radio(s). Another example method can include determining that a UE in cell paging channel mode has changed its selected macro cell radio; determining that the UE is allowed service on a small cell radio located in a vicinity of a macro cell coverage area of a selected macro cell radio; and adjusting a transmit power of the small cell radio based on a presence of the UE in a surrounding macro cell coverage area of the small cell radio.

Abstract: In an example embodiment, a method includes receiving, from a visited network having a first wireless network type, a first update location request message according to a first signaling protocol, the first message associated with a user equipment roaming at the visited network. The first message is converted to a second update location request message according to a second signaling protocol and transmitted to a home network associated with the user equipment, the home network having a second wireless network type. An update location response message according to the second protocol is received from the home network, the update location response message including a user profile associated with the second network type. A combined user profile is generated based on a user profile associated with the first network type and the user profile associated with the second network type. The combined user profile is transmitted to the visited network in an update location answer message according to the first protocol.

Abstract: The present application provides an uplink detection-based processing method, a network device, and a terminal. The method includes: acquiring first information; acquiring receive power information that is used by a first access device to receive a radio signal sent by a terminal; and performing processing according to the first information and the receive power information that is used by the first access device to receive the radio signal sent by the terminal. Embodiments of the present application can implement uplink detection-based processing.

Abstract: Systems and methods for security in a nationwide wireless network with geographically dispersed wireless routers are described. The wireless routers have an interface function with an ability to receive telephone calls from an authorized caller. The router, in response and on demand generates a set of bounded random numbers (BRN) as a random seed for use in generation of encryption keys for communication security between the router and a portable wireless device of the caller.

Abstract: A method, an apparatus, and a system for distributing data of a virtual subscriber identity module (VSIM) where a terminal device acquires a graphic code from a distribution client; and acquires the temporary data of the VSIM and the service authentication code that are included in the graphic code; and registers with a mobile network according to the temporary data of the VSIM, and connects to the management server through the mobile network; and sends to the management server, a request for downloading formal data of the VSIM; and if the authentication is passed, the management server acquires formal data that is of the VSIM and corresponding to the service authentication code, and sends the formal data of the VSIM to the terminal device.

Abstract: A method of operating an internet-based telephony system comprises (1) determining that a telephony device associated with a customer of the internet-based telephony system has access to service of the internet-based telephony system; (2) sending a first location update signal to a public land mobile network associated with the customer; (3) receiving an indication that the public land mobile network associated with the customer no longer considers the internet-based telephony system as being the network visited by the telephony device associated with the customer; (4) determining the telephony device associated with the customer and the internet-based telephony system are in data communication, and (5) sending a second location update signal to the public land mobile network associated with the customer to register again the internet-based telephony system as the network visited by the telephony device associated with the customer.

Abstract: A method and system for accessing a network over a public device are provided in the present invention. The method includes: a user inputting an Access Identifier (AID) and authentication information over the public device, and initiating a network access request; after receiving the network access request, an Access Service Node (ASN) transmitting the received network access request to an Authentication Center (AC) to authenticate validity of the User's AID information, and forwarding a network access response returned by the AC to the public device; and after the public device receives the network access response, if the User's AID information is authenticated by the AC to be valid, the public device using the User's AID as a virtual AID, and using the virtual AID to transmit/receive messages of the user.

Abstract: The disclosed apparatus may include (1) a storage device that maintains information about mobile devices roaming within a wireless network, (2) an AP-prediction unit that (A) determines, based at least in part on the information maintained in the storage device, a number of times that a mobile device has visited a specific AP within the wireless network, (C) generates, based at least in part on the number of times, a score that represents a probability that the specific AP is the next AP visited by the mobile device, and then (D) determines that the score is above a certain threshold, and (3) a profile-distribution unit that provides, in response to the determination that the score is above the certain threshold, the specific AP with a roaming-session profile that facilitates transferring a roaming session of the mobile device to the specific AP. Various other apparatuses, systems, and methods are also disclosed.

Abstract: A control target device receives, from a control point device connected to a first network, a message for requesting movement to a second network. The control target device transmits a network movement advertising message to the control point device of the first network. The control target device disconnects from the first network and accesses the second network. The control point device collects device information on a plurality of control target devices connected to a plurality of networks. When a network of one control target device selected from the plurality of control target devices is different from a network of the control point device, the control point device accesses the network of the selected control target device.

Abstract: A method for handling a random access procedure in a user equipment, called UE hereinafter, of a wireless communications system includes outputting a message 3 as a scheduled transmission not including a specific field indicating whether the UE has a cell Radio Network Temporary Identifier, called C-RNTI hereinafter, or not during the random access procedure.

Abstract: A control apparatus includes: a determination unit that determines whether identification information for identifying a mobile communication terminal in a second mobile communication network can be changed from first identification information assigned in the first mobile communication network to a second identification information assigned in the second mobile communication network, when the mobile communication terminal in which the first identification information is stored is situated in a region in which the second mobile communication network can be used and the mobile communication terminal uses the first mobile communication network via a second mobile communication network; and a notification unit that transmits a notification of a change of the identification information to a request apparatus that is connected to the second mobile communication network and is configured to request the mobile communication terminal to change the identification information, if it is determined that the identification

Abstract: Mobility states are defined in order to prevent excess signaling overhead and to conserve power on a wireless transmit/receive unit (WTRU) in a wireless network. The WTRU may determine that is operating in a low mobility state based on triggers related to the frequency of movement of the WTRU between network cells. The WTRU may change cells less frequently in a low or no mobility state than in a normal mobility state. Upon determining that the WTRU is in the low or no mobility state, the WTRU may configure mobility procedures associated with the low or no mobility state in order to conserve power and other network resources. The WTRU may coordinate its mobility state with the network.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for scanning a radio frequency spectrum for an available frequency band, selecting an available frequency band in the radio frequency spectrum even if the available frequency band is affected by radio frequency interference, measuring a signal strength in portions of the available frequency band, correlating the signal strength of each portion to generate a correlation factor, detecting radio frequency interference in the available frequency band according to the correlation factor, and generating tuning coefficient data to cause the filter apparatus to substantially suppress the radio frequency interference in the available frequency band. Other embodiments are disclosed.

Abstract: Embodiments of the present invention provide a method of reducing power consumption in a wireless network device, comprising determining a duration prior to a beacon being received by the device; comparing the duration against a predetermined value; and adjusting a duration of a sleep period in response to the comparison.

Abstract: Methods and devices for enabling improved cell reselection procedures on a wireless communication device with a first SIM is camped on a serving cell of a first network may include receiving a list of neighbor cells from system information that is broadcast in the serving cell, and performing signal measurements associated with the listed neighbor cells and the serving cell, and, based on the signal measurements, identifying neighbor cells that satisfy selection criteria. The wireless device may calculate ranking criteria for the serving cell and the identified neighbor cells, and determine whether an inter-frequency neighbor cell has a highest ranking criteria among all of the ranked cells. Upon determining that an intra-frequency neighbor cell has the highest ranking criteria, the wireless device may start a reselection timer and also start decoding the system information that is being broadcast in the intra-frequency neighbor cell that has the highest ranking criteria.

Abstract: A device and method comprises receiving a network request, and provides a dynamic flow management and a conditional logic provisioning command driver in the form of a computational instruction in response to the network request. The network request is received by a processor accessible in a network from at least one requesting subscriber unit subscribing to a first network service configuration. A conditional logic provisioning command driver is provided in response to the network request by the processor to reconfigure the first network service configuration to a second network service configuration according to the received network request. The conditional logic provisioning command driver may be implemented conditionally according to at least one business rule associated with at least one value defined by the network request.

Abstract: Proposed is a technique for preparing a roaming operation of a User Equipment (UE) between a home network and at least one visited network. A method aspect being performed in a roaming control entity comprises receiving at least one message related to the roaming operation, determining if a roaming attempt from the home network to the at least one visited network is performed, and, if the determining step is affirmative, requesting, from the home network, information relating to the UE so as to evaluate if the UE has access to the home network. The method aspect being performed in the UE comprises transmitting the at least one message about the roaming attempt, and receiving, responsive to the transmitting, deny or grant of access of the UE to the at least one visited network depending on whether the UE has access to the home network or not.

Abstract: A method of determining inbound roaming market share of a host network is disclosed. The network subscribers are identified by their subscriber identity (IMSI). Each IMSI is categorized based on its roaming status. The roaming categories are as follows: successfully roaming, roaming but steered to another network, not roaming due to errors related to steering, not roaming due to errors not related to steering, roaming below a threshold, roaming below a threshold duration, and roaming on rival networks. SRI-for-SM results of SMS activity are used to determine the count of IMSIs roaming on rival networks. Market share is determined by calculating a quotient of the count of IMSI's categorized as successfully roaming on the host network and the difference between the total count of the IMSIs and the count of IMSIs categorized as not roaming due to errors not related to steering.

Abstract: One embodiment of the present specification discloses a method for transmitting uplink control information (UCI). The method may be performed by a terminal and comprise receiving control information for setting such that an uplink control channel and an uplink shared channel are not simultaneously transmitted on one uplink subframe; selecting one of the channels, if first uplink control information (UCI) for a first cell and second uplink control information (UCI) for a second cell are requested to be simultaneously transmitted on the one uplink subframe through the uplink control channel in case of the first uplink control information (UCI) and through the uplink shared channel in case of the second uplink control information (UCI); and transmitting at least one from among the first uplink control information (UCI) and the second uplink control information (UCI) on the uplink subframe through the selected channel.

Abstract: A first communication device sends a call request to a second communication device. The call request comprises a source address associated with the first device and a destination address associated with the second communication device. A communication system modifies the call request by replacing or augmenting the source address with a dynamic address and adding a key associated with the source address. The modified request is sent to the second device. If a user at the second device wants to make a return call, a call request is sent using the dynamic address as the destination address along with the key. The call request is routed to the first communication address by determining the source address of the first communication device from the key.

Abstract: Providing for virtual management of wireless resources in a mobile communication environment is described herein. By way of example, access terminals in the communication environment can maintain connections with nearby network transmitters and report factors pertinent to wireless scheduling to a central entity, such as a macro base station. The macro base station can employ those factors in improving wireless communications for other serving cells within or near to a macro coverage area served by the macro base station. By maintaining information pertinent to prevailing wireless conditions, quality of service requirements, pilot signal reports, mobility management considerations, and so on, of transmissions within the cell, significant interference reduction can be implemented for the macro coverage area, or nearby coverage areas.

Abstract: A software defined networking controller can be provided to manage sharing of information relating to roaming requests for mobile devices that are roaming on visited networks. The software defined networking controller can be a sub-instance of a main software defined networking controller that manages traffic within the home network, and the software defined networking controller can sit at the edge of the home network and control edge routing elements. The edge software defined networking controller may communicate with roaming partner's edge software defined networking controller and/or with the roaming interconnect operator's software defined networking controller to exchange roaming related information.

Abstract: Systems and methods for routing pages to cellular phones (UE) not connected to a cellular network, but connected to a wireless local area network (I-WLAN), are disclosed. The system can route cellular pages to disconnected cellular devices using 3GPP AAA components, such as a Third Generation Partnership Project authentication, authorization, and accounting (3GPP AAA) server. The system can route pages via a home location register (HLR) connected to the I-WLAN or a mobile switching center (MSC) connected to the I-WLAN. The system can determine an appropriate MSC based on proximity of the MSC to the last known location of the UE, for example, or based on the MSC with the lowest utilization rates. The system can send a page to the UE via the I-WLAN instructing the UE to reconnect to the cellular network. The system can then send cellular data to the UE using the cellular network.

Abstract: Techniques for a method for automatically synchronizing application state across multiple devices are disclosed herein. The method includes running an instance of a computer application at a first electronic device, detecting a presence of a second electronic device based on a proximity of the second electronic device to the first electronic device, identifying an installation of another instance of the computer application on the second electronic device, and transmitting an application state data to the second electronic device. The application state data represents an application state of the computer application at the first electronic device. The application state data of the computer application enables another instance of the computer application at the second electronic device to resume running the computer application from the transmitted application state.

Abstract: The present invention relates to a method for managing the automatic provision of a subscriber network identifier from a central network server to a subscribed communication device, the method comprising receiving notification at the central server relating to a change in the current location for the subscribed device, and determining from the notification whether a new subscriber network identifier is to be provisioned from the central server. The method further comprises selecting a subscriber network identifier on the basis of the current location, if the determining step has determined that a new subscriber network identifier is to be provisioned, and outputting the selected subscriber network identifier for transmission to the subscribed device. The present invention also relates to managing the automatic connection of a subscribed communication device to a network, where a preferred network and preferred subscriber network identifier may be used.

Abstract: A wireless network infrastructure, comprising static and roaming mobile nodes (including one or more types of access-points), avoids unnecessary handoffs and unstable RF regions, and enables at least selected context-aware-capable mobile nodes to provide context-aware services to connected clients. More particularly, each of at least selected static nodes is enabled to provide the context-aware-capable mobile nodes with context information regarding the static node's relative position and direction, details of information served by the static node, special flags indicative of relevant impending changes in the foregoing parameters, and a range of signal strength values defining a stable RF zone for associated mobile nodes. Each context-aware-capable mobile node accordingly creates a context map that at least in part enables determination of the mobile node's next change in static node association and the preferred timing for the change.

Abstract: Exemplary subscriber identification module (“SIM”) based machine-to-machine (“M2M”) client systems, methods, and apparatuses are described herein. An exemplary M2M device includes an M2M SIM client implemented on a SIM card installed in the M2M device. The M2M SIM client provides a platform messaging interface through which the M2M device communicates with an M2M platform, provides a device-side interface through which the M2M device interfaces with the M2M SIM client, and provides a set of one or more M2M services to the M2M device. The set of M2M services may include one or more of the exemplary M2M services described herein. Corresponding systems, methods, and apparatuses are also described.

Abstract: A base station 100 includes a scheduling processing unit 109 configured to schedule each of multiple mobile stations to the PDCCH, and a UE-type judgment unit 107 configured to judge whether each of the mobile stations is an OLD UE supporting only CFI=1 to 3 or a NEW UE supporting CFI=1 to 4. The scheduling processing unit 109 schedules each of the multiple UEs to the PDCCH by use of any one of CFI=1 to 3 when UEs targeted to be scheduled to the PDCCH include an OLD UE.

Abstract: A system for utilizing a location-based application across a plurality of networks. A target mobile device operates within a target network of the plurality of networks. A requesting device operates within a requesting network of the plurality of networks. The requesting device transmits a location request for a location of the target mobile device utilizing a location-based service application. A gateway operatively communicates with the requesting network and target network. The gateway receives the location request and determines the target network and communication and location technologies utilized by the target network and transmits the request to the target network utilizing the communication location technology for extraction of the location information. The gateway extracts the location information of the target mobile device and transmits the location of the target mobile device to the requesting device for use with the location-based service application.

Abstract: Computer systems and methods for managing network data consumption between a client computer and one or more server computers. A computer system comprising: a memory persistently storing a set of instructions; one or more processors coupled to the memory, wherein the one or more processors execute the set of instructions, which causes the one or more processors to: intercept, at a client computer, a first request to a first server computer from a first application being executed on the client computer before the client computer sends the first request to the first server computer; determine whether the first request should be monitored based on data associated with the first application; in response to determining that the first request should be monitored, redirect the first request to a second server computer that is different than the first server computer, and include one or more parameters that identify the first application and the first server computer.

Abstract: A system and method are provided for reliable activation and attachment of mobile devices. An activation server receives, from a client device, a subscription request for accessing a network, wherein the subscription request includes a first identifier of the client device. The activation server determines, based on the first identifier, whether a pending subscription account exists or a new subscription account is to be created. Upon determining that the pending subscription account exists or the new subscription account is to be created, the activation server releases the pending subscription account or creates the new subscription account, and instructs the client device to remove a second identifier from the client device and to use the first identifier for attaching to the network.

Abstract: Method for routing mobile phone signaling messages between different collaborating networks (20,30) including an STP (25,35) and at least two home networks (10,40) including an STP (16,36). A collaborating ITP (29,39) is connected to a collaborating STP (25,35), a home ITP (17,47) is connected to a home STP (16,46), and a central ITP (51) is connected to each ITP via a wide area network (6) which is not a PSTN. A visited country IMSI identifies a mobile subscriber as a subscriber to a collaborating network. A visited IMSI is associated with a home network in the central ITP. A signaling message, including the visited IMSI, is sent from a collaborating STP to the collaborating ITP, and is forwarded to the central ITP. The message is forwarded from the central ITP to a home ITP with which the visited IMSI is associated, and sent to the corresponding home STP.

Abstract: The invention relates to a method for transmitting data to at least one communications end system, and to a communications device for carrying out said method.

Abstract: A system and method for automatic session data transfer between computing devices based on zone transition detection are disclosed. A particular embodiment is configured to: determine if a mobile or wearable computing device is located within a proximity zone around a location of a stationary computing device; establish an authorized wireless data connection with the mobile or wearable computing device via a wireless transceiver; determine if the mobile or wearable computing device is likely departing the proximity zone and if so, upload user session data to the mobile or wearable computing device; and determine if the mobile or wearable computing device is likely approaching the stationary computing device and if so, download user session data from the mobile or wearable computing device.

Abstract: A method of providing a service to a user equipment (UE) via a packet data network gateway (PDN GW), wherein the UE is served by a visited public land mobile network (V-PLMN) and wherein the UE has a subscription with a home public land mobile network (H-PLMN) comprising the steps of: providing, by a register in the H-PLMN, a H-PLMN-allowed indication, indicating whether a PDN GW in the H-PLMN is authorized to be selected for the UE for execution of the service, and providing, based on the H-PLMN-allowed indication, an indication to the UE, whether the UE can expect successful execution of the service.

Abstract: In systems and methods of establishing an attachment between a wireless device and a communication network, an attachment request is received from the wireless device, an access node, or both, and an update location request is transmitted to a subscriber database. A create session request is transmitted to a gateway node before an update location answer is received from the subscriber database.

Abstract: Disclosed are methods, systems and devices for providing location based services in a venue. To estimate its location, in a particular implementation, a mobile device may obtain a measurement of a range to a transponder device positioned at a known location based on measurements of a signal round-trip time (RTT) in a message exchange with the transponder device. Positioning assistance data from a server may enable the mobile device to measure a delay at the transponder device in providing a response to a probe message to thereby more accurately measure the signal RTT.