Abstract:
PROBLEM TO BE SOLVED: To provide a communication system capable of completing soft hand-off, even when a communication link between an active base station and a mobile station deteriorates before the mobile station receives a handoff direction message. SOLUTION: A device for wireless communications (hereinafter referred to as device) maintains a list of base stations X that the mobile station is in communication with, referred to as an "Active Set". Further, the device maintains another list of base stations Y close to the base stations X in the Active Set. The list is called a "Neighbor Set". A memory in the device includes information which enables the device to demodulate information transmitted from the base stations Y in the Neighbor Set. When a base station Y is included in a pilot strength measurement message (PSMM), the device places the base station Y in the Active Set. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for monitoring link activity to prevent system deadlock in a dispatch system. SOLUTION: The method and an apparatus are provided to prevent system deadlock in a dispatch system by monitoring link activity. The dispatch system is comprised of remote units 10, 20, 22 which communicate with each other by broadcasting one at a time to the group. The remote unit 10 communicates with the other remote units through at least one base station 44. A communications manager 40 grants the remote unit 10 to be an exclusive system talker upon request through the base station servicing the requesting remote unit 44. The base station 44 monitors a series of data from the remote unit designated as the system talker 10 to detect voice activity. The base station 44 sends a surrogate request to the communications manager 40 to relinquish the system talker privilege if the voice activity falls below a predetermined threshold. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To construct an optimum network system having a control point, routers, and network access points which is capable of handling failures in the control point and routers. SOLUTION: Functionality of the control point is distributed, and the control point can be co-located with every network access point. Each of the plurality of network access points is configured to communicate with at least two of the plurality of routers and to communicate with at least one remote user. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To adapt a protocol which manages an infrastructure in response to management of aspect corresponding peer-to-peer communication between access terminals without extensive redesign or change the protocol. SOLUTION: In a multiple-access network, network access terminals 106 can communicate with network infrastructure access nodes 104, or conduct peer-to-peer communications 110. The access terminals are adapted to adjust the transmit power level in response to power control commands received from the network and from at least one access terminal. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for preserving power of a remote unit in a dispatch system. SOLUTION: To reduce the power consumption of a remote unit in a dispatch system, the remote unit enters a sleep state. A base station (32) transmits a forward link broadcast signal and monitors a common access channel. A first remote unit (10) continually receives and decodes the forward link broadcast signal and judges whether the forward link broadcast signal includes active signals (106). If the remote unit judges that the forward link broadcast signal includes no active signals for a duration T1, the first remote unit enters a sleep mode (148). In the sleep mode, the remote unit sporadically receives and decodes the forward link broadcast signal. If this remote unit or any other remote unit on the same net presses a push-to-talk button (128, 130), it transmits a message on the common access channel. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a bit total integrity and a synchronous data transmission on a channel which does not hold synchronization. SOLUTION: A fixed rate bitstream formed by a terminal equipment is provided to a communication unit. A first data frame containing a first set of bit and a value of a first length region, a second data frame containing a second set of bit and a second length region, and a third data frame containing a third set of bit and a value of a third length region, are formed. The first, the second and the third data frames are transmitted to a base station, and the first set of bit from the first frame and a set of filling bits of a number equal to the maximum number of bit contained in any frame are put into queue. The number of set of a second bit of the third data frame is determined, based on the value of the first length region and the value of the third length region, and excess filling bits are overwritten in the queue in the set of the third bit. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for performing efficient system access in a dispatch system. SOLUTION: A communications manager (40) grants an exclusive system talker privilege to one remote unit (10) in the system at a time. After a first pre-determined time has elapsed, any other remote unit (20, 22) can request the exclusive system talker privilege and become the exclusive system talker. The exclusive system talker privilege is revoked by the communications manager (40) to any remote unit who retains the exclusive system talker privilege for more than a second pre-determined amount of time. The exclusive system talker privilege is also revoked upon the release of a push-to-talk button on a remote unit (10). Furthermore, a base station (44) in communication with a remote unit (10) designated as the exclusive system talker generates a surrogate relinquishment request to the communications manager (40) when the exclusive system talker travels outside the coverage area of the system. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system and a method, which give a simple but effective technology for communication an overhead message in a wireless communication system supplying access to a distributed network while band width is saved and power consumption is set to be minimum. SOLUTION: A wireless base station connected to the distributed network transmits a series of signatures in the overhead message to a mobile unit. The mobile unit wakes up and receives the signatures and compares them with a signatures stored in the mobile unit. When the signatures received by the mobile unit differ from the signatures stored in the mobile unit, the mobile unit receives the overhead message transmitted by the wireless base station while it is kept wake up. When the signatures received by the mobile unit are the same as those stored in the mobile unit, the mobile unit returns to sleep.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for providing a simple but effective technique for communicating overhead messages in a wireless communication system providing access to a decentralized network, while minimizing power consumption as well as saving bandwidth.SOLUTION: A wireless base station which is connected to a decentralized network transmits a sequence of signatures for overhead messages to a mobile unit. The mobile unit wakes up, receives the signatures and compares them to signatures stored at the mobile unit. If the signatures received by the mobile unit are different from the signatures stored at the mobile unit, the mobile unit stays awake to receive the overhead messages to be transmitted by the wireless base station. If the signatures received by the mobile unit are the same as the signatures stored at the mobile unit, the mobile unit goes back to sleep.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for improving content delivery with a business incentive for placement of kiosks with multiple wireless access points in public locations so that portable media players (PMPs) can receive media contents.SOLUTION: Coordination between subscribing users of PMPs 504, vendors who provide kiosks, and a network central controller 514 of a content distribution system allow for: prepositioning of video contents at the kiosks through economically desirable low data rate communication links from the network; coordinated queuing of downloads (e.g., partial downloads) from a kiosk to a PMP, peer-to-peer (P2P) downloading between PMPs, and uploads from a PMP to a kiosk; and billing/crediting to correspond with such participation in the distribution.