Abstract:
PROBLEM TO BE SOLVED: To relate to data communication and to provide a new and improved method and apparatus for high rate packet data transmission.SOLUTION: In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.
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 improve a variation in the transmission rate of a variable rate vocoder and any other variable rate data source in order to maximize the usage state of communication resources. SOLUTION: Use of a communication resource, for example, use of a forward link resource from a base station 2 to a remote user 4 or use of a reverse link resource from the remote user 4 to the base station 2 is measured. The measured use value is compared with at least one predetermined threshold to change a communication subset relating to a communication data rate or the communication resource according to the comparison result. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve use of a forward link by high rate packet data transmission and to decrease a transmission delay in a data communication system capable of variable rate transmission. SOLUTION: Data transmission on the forward link is time multiplexed and a base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve the utilization of a forward link, and to reduce a transmission delay caused by high rate packet transmission in a data communication system capable of variable rate transmission. SOLUTION: Data transmission on a forward link is time-multiplexed and a base station transmits data at the highest data rate supported by a forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of a forward link signal as measured at the mobile station. Upon the determination of a data packet which is erroneously received, a mobile station transmits a NACK message back to the base station. The NACK message results in the retransmission of the data packet which is erroneously received. The data packet can be transmitted to the outside of a sequence by the use of a sequence number to identify each data unit in the data packet. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve utilization of a forward direction link and decrease transmission delay in high-rate packet data transmission, in a data communication system which can carry out variable rate transmission. SOLUTION: Data transmission in the forward direction link is time multiplexed, and a base station transmits at the highest data rate supported by the forward direction link at each time slot to a single mobile station. The data rate is determined by the largest C/I measurement of the forward link signals, as measured at the mobile station. Upon determination that a data packet is received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in the retransmission of the data packet received in error. The data packet can be transmitted outside of the sequence by the use of sequence number, to identify each data unit which is within the data packets. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a modulation system which reduces mutual interferences and produces orthogonal pseudo-noise(PN) sequences so as to overcome fading. SOLUTION: A means (604) which generates a 1st orthogonal sequence signal that corresponds to one selected sequence from among plural orthogonal binary sequences receives an input signal and converts a sequential part of the input signal into one orthogonal binary sequence, selected from among plural orthogonal binary sequences respectively according to the value of each input signal part, a means which generates a PN signal generates a PN signal, corresponding to a PN binary sequence that is defined beforehand and connecting means (610 and 612) connect the 1st orthogonal sequence signal and the PN signal and supply a result signal.
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 improve use of forward direction link and reduce delay in transmission of high rate packet data in the data communication system enabling variable rate transmission. SOLUTION: Data transmission in the forward direction link 50 is time-multiplexed and a base station 4 executes transmission to a mobile station 6 in the maximum data rate supported with the forward direction link 50 in each time slot. The data rate is determined by the C/I measurement where the forward direction link signal becomes largest as measured at the mobile station 6. When a data packet received erroneously is determined, the mobile station 6 transmits a NACK message to be returned to the base station 4. The NACK message results in re-transmission of the data packet received erroneously. The data packets can be transmitted out of sequence by the use of the number of sequences to identify each data unit within the data packets. COPYRIGHT: (C)2010,JPO&INPIT