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: The mobile station maintains a list of communicating base stations X, referred to as an "Active Set". Further, the mobile station maintains another list of base stations Y close to the base stations X in the Active Set. The list is referred to as a "Neighbor Set". A memory in the mobile station includes information which enables the mobile station to demodulate information transmitted from the base stations Y in the neighboring set. When a base station Y is included in a pilot strength measurement message (PSMM), the mobile station 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 transmitting/receiving variable rate data. SOLUTION: The data are spread by using a long pseudo noise code generated by a linear feedback PN generator 16, and the mask is selected by a mask selector 14 in accordance with speed of transmission of the variable data and the specific user who transmits the data. Thus, the data rate can be determined by identifying which mask allows the received waveform to be correctly despread at the receiver. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for minimizing data bottlenecks in low data rate networks (LDRNs) that communicate facsimile transmissions. SOLUTION: An LDRN is a facsimile network having a transmission data rate less than the data relate of the FAX machines serviced by the network. The system and method can be implemented in any type of LDRN, including analog and digital wired LDRNs, as well as analog and digital wireless LDRNs (cellular networks, for example). The system and method involve processing the facsimile transmissions in order to make the data rates of the LDRN and the FAX machines compatible. Thus, any potential facsimile data bottlenecks that may occur in the LDRN due to its slower data rate can be minimized. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a novel and improved method describing combining of signals in a high-rate wireless communication system. SOLUTION: Reverse link busy bits are independently generated by each base station and indicative of whether the transmitting base station has reached a reverse link capacity limit. A remote station combines multipath components of the reverse link busy bits from each of the transmitting base stations in its Active Set and in response transmits a reverse link signal only when all of the reverse link busy bits indicate that the base stations in the remote stations Active Set have reverse link capacity. The remote station weights the reverse link busy signals in accordance with a signal strength of the base station transmitting the busy signal and determines whether to transmit based on the weighted sum of the busy signals. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system for transmitting variable rate data packets. SOLUTION: The data is spread using a long pseudo noise code generated by a linear feedback PN generator 16, the mask of which is selected by mask selector 14 in accordance with the transmission rate of the variable data and the specific user transmitting the data. Thus, by identifying at the receiver which mask will allow the received waveform to be correctly despread, the rate of the data can be determined. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for transmitting/receiving variable rate data. SOLUTION: In this method for transmitting/receiving variable rate data, the data are spread by using a long pseudo-noise code generated by a linear feedback PN generator (16), and the mask is selected by a mask selector (14), in accordance with the transmission rate of the variable data and the specific user who transmits the data. Thus, the data rate can be determined by identifying which mask allows the received waveform to be correctly despread at the receiver. COPYRIGHT: (C)2009,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 system and method for providing techniques, which are simple but effective, for communicating an overhead message in a wireless communication system providing access to a distributed network while saving a bandwidth and minimizing power consumption. SOLUTION: A wireless base station connected to a distributed network transmits a series of signatures of an overhead message to a mobile unit. The mobile unit is brought into a wakeup mode to receive the signatures and compares them with signatures stored in the mobile unit. If the signatures received by the mobile unit are different from the signatures stored in the mobile unit, the mobile unit receives the overhead message transmitted by the wireless base station while keeping the wakeup mode. If the signatures received by the mobile unit are identical to the signatures stored in the mobile unit, the mobile unit returns to a sleep mode. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a distributed infrastructure for wireless data communications. SOLUTION: A mobile user terminal 402 accesses a packet data network 450 through one or more points of a plurality of network access points (404-412). One or more control points (432-440) determine which access point or multiple points the user terminal is to access. Control may be retained in the current control point, or transferred to another control point, whenever it is convenient. There are a plurality of routers, each having an associated home agent (418-420) which determines which foreign agents need to be accessed on behalf of each user terminal. The foreign agents (422-430) forward packets received from a user terminal's home agent to the control point currently controlling communications with the user terminal. COPYRIGHT: (C)2010,JPO&INPIT