Abstract:
A method of selecting handover targets for a communication unit (40) exchanging a communicated signal through a serving base site (10-19) in a digital cellular system. The method uses timing advance to determine a relative distance of a communication unit (40) to the serving base site (10-19). The method comprises the steps of comparing a timing advance value with a first threshold. The first threshold may be equal to a distance one and one-half times the radius of the serving cell. When the timing advance value exceeds the first threshold, a base site frequency list is modified to include base sites non-adjacent the serving base site. The identity of the base sites non-adjacent the serving base sites may be determined from the directionality of communication unit (40). The method further includes the step of selecting a handover target providing highest relative RRSI value to the communication unit (40) from the modified base site frequency list.
Abstract:
A method is provided which enables the connection of nodes out of communication range while minimizing the energy consumption in standby nodes. Specifically, the present invention provides a method to control the wake up rate of standby nodes in a multi-hop communication system. An access point collects, processes, and refines statistical information regarding one or more system parameters; determines a wake up rate based on the statistical information and one or more historical information; and transmits the wake up rate to nodes in its coverage area. A node receives the wake up rate; and periodically changes from a sleep state to a wake up state at the wake up rate to support routing functions for providing multi-hop communication to the one or more access points.
Abstract:
A method of automatically prioritizing cells in a neighbor list of a communications system. The priority is defined as the number of times a cell in the neighbor list has been added to the active set. Cells that have been added to the active set more often are given a higher priority. Such higher priority cells are considered first for addition to the monitored set because they are more likely to successfully move from the monitored set to the active set.
Abstract:
A wide area network assisted multimedia content delivery system (200) includes a first wide area network handset (205) and a second wide area network handset (207) having one or more transceivers (208) for exchanging information over the wide band network as well as multimedia information via an ad hoc communication. A wide area base unit (201) is used for communicating with the first wide area network handset (205) and second wide area network handset (207) where a content distribution broker (203) associated with the wide area base unit (201) is used for brokering multimedia content (audio, video and text data) between the first wide area network handset (205) and the second wide area network handset (207). The transceiver (208) operates to exchange multimedia content in an ad hoc communication directly between the first wide area network handset (205) and second wide area network handset (207) when within a predetermined proximity.
Abstract:
A method for providing secure communications among a plurality of ad hoc devices includes authenticating one or more first devices within a first network; authenticating one or more second devices within a second network; transmitting a group key to the authenticated first devices and to the authenticated second devices; establishing an ad hoc network by at least one of the authenticated first devices and at least one of the authenticated second devices using the group key; and communicating within the ad hoc network among the at least one of the authenticated first devices and the at least one of the authenticated second devices.
Abstract:
A registration from a subscriber is delivered to the cellular network via an ad hoc network. Based on registration information, several return paths are prepared for delivery of a page from the cellular network to the subscriber regardless of the initial or final coverage state of the subscriber and regardless of the final coverage or operational state of its assigned relays.
Abstract:
A method of dividing a first piconet into two or more piconets is implemented by a master wireless device. The master wireless device selects a master for a second piconet from among the slave wireless devices within the first piconet. The selection can be based upon each operational link between a base site and candidates for master of the second piconet as well as each operational link between the candidates for master of the second piconet and candidates for active slaves of the second piconet. The master wireless device thereafter informs each slave of the first piconet of the selection of the master of the second piconet. The master wireless device can further assign one or more of the slaves of the first piconet to enlist as a slave in the second piconet, or alternatively, each slave of the first piconet can enlist as a slave in either the first piconet or the second piconet.
Abstract:
A method of reducing an audio gap in a signal connection with a communication unit during handoff in a cellular communication system is provided. The method includes the steps of providing a temporary signal connection with the communication unit from a mobile switching center (MSC) of a source base site, through the source base site to a handoff target base site and establishing a trunk connection from the MSC of the source base site to a MSC of the target base site. The method further includes the step of interconnecting, at the target base site, the temporary signal connection, trunk connection, and communication unit; and re-routing the signal connection with the communication unit through the trunk connection.
Abstract:
A method of selecting handover targets for a communication unit (40) exchanging a communicated signal through a serving base site (10-19) in a digital cellular system. The method uses timing a dvance to determine a relative distance of a communication unit (40) to the serving base site (10-19). The method comprises the steps of co mparing a timing advance value with a first threshold. The first threshold may be equal to a distance one and one-half times the radius of the serving cell. When the timing advance value exceeds the first threshold, a base site frequency list is modifie d to include base sites non-adjacent the serving base site. The identity of the base sites non-adjacent the serving base sites may be determined from the directionality of communication unit (40). The method further includes the step of selecting a handover target p roviding highest relative RRSI value to the communication unit (40) from the modified base site frequency list.