Abstract:
A method for performing a position fix by a mobile terminal camped on a packet control channel is provided. The method includes transmitting a request for Global Positioning System (GPS) assistance data via the packet control channel and receiving the requested assistance data via the packet control channel. The method also includes performing the position fix using the received assistance data.
Abstract:
A mobile station of a non-public wireless system is described for communicating in a mobile public voice and data network having acircuit side for communicating voice and circuit data and a packet side for communicating packet data. The mobile station includes a memory storing information relating to select channels in at least one of the circuit side and the packet side and select channels of the non-public system. A comparator is operable when the mobile station is communicating on a given channel on the packet side for comparing the given channel to the stored information to determine a matched or non-matched condition. A communication control is operable if a matched condition exists to scan for channels of the non-public system, and if a non-matched condition exists to communicate on the packet side.
Abstract:
A method and apparatus for acquiring timing signals for use in a positioning receiver using timing assistance provided by a wireless communications system, such as cellular telephone system. A mobile terminal equipped with a positioning receiver operates in a wireless communications system having control channels and at least one traffic channel unsynchronized to the control channels. The mobile terminal camps on a first control channel in a first cell having a first time base associated therewith. While camped on the control channel, the mobile terminal establishes a local clock reference, internal to the mobile terminal, capable of tracking the first time base. The mobile terminal then operates on a first traffic channel that is unsynchronized to the first control channel and notes the difference in time bases between the control channel and the traffic channel. Either while camped on the control channel or while operating on the traffic channel, the mobile terminal receives TDMA-to-GPS relationship data, which is a measure of the offset between system time for the wireless communications system as expressed on particular control channel ("TDMA time") and the system time for the GPS system ("GPS time"). Thereafter, an accurate estimate of the GPS time is calculated in the mobile terminal based on the local clock reference and the TDMA-to-GPS relationship data. In some aspects, the local clock reference is updated based on the first traffic channel so as to minimize errors arising from timing drift.
Abstract:
A system (140/145) determines a position of a mobile terminal (110) tuned to a first control channel. The system (140/145) sends a paging request to the mobile terminal (110) via the first control channel. The paging request indicates that the mobile terminal (110) is to switch to a second control channel. The system (140/145) also receives a paging response from the mobile terminal (110) via the second control channel and determines the position of the mobile terminal (110) based on the paging response.
Abstract:
A method of controlling the transmission of identities for wireless communications devices relies on a broadcast message from the network to instruct the wireless communications devices as to when to send their identity information. The network's control over the transmissions is extended to the control function class level. In a simple embodiment, the network includes instructions in a broadcast message telling the receiving wireless communications devices to send their identities for some classes of control functions and not others. Thus, by altering the broadcast message, the network is able to control the identity transmissions of the wireless communications devices. In more sophisticated embodiments, the network can control not only whether identities are transmitted for certain control functions, but which identity is transmitted. Thus, one identity (e.g., subscription module identifier) may be transmitted with one class of control functions (e.g., registration) and another identity (e.g., mobile terminal identifier) to be transmitted with other classes of control functions (e.g., page response), thereby providing great flexibility of control to the network.
Abstract:
A method for performing a position fix by a mobile terminal camped on a packet control channel is provided. The method includes transmitting a request for Global Positioning System (GPS) assistance data via the packet control channel and receiving the requested assistance data via the packet control channel. The method also includes performing the position fix using the received assistance data.
Abstract:
Systems and methods for suspending packet switched communications in a user terminal that is configured to operate in both a circuit switched network and a packet switched network. The packet switched network is notified via an interface between the packet switched network and the circuit switched network to suspend communications to a user terminal. This may be accomplished by notifying a gateway node in the circuit switched network that the user terminal is no longer registered in the packet switched network, and by then relaying this information from the gateway node to a control node of the packet switched network via the interface between the networks. The suspend message may be sent in response to the circuit switch network receiving a call origination message from the user terminal, or, alternatively, in response to the circuit switch network receiving an incoming call to the user terminal. In this latter situation, the user terminal may be notified of the incoming call via a page, which the user terminal then responds to via a page response that is sent to the circuit switched network.