Abstract:
PROBLEM TO BE SOLVED: To enable handover between TDMA and CDMA base stations without interrupting communications.SOLUTION: A mobile wireless telecommunications system includes base stations of a first type operating according to a first air interface, and base stations of a second type operating according to a second air interface. A communications link is established over the first air interface between a mobile station and the first base station. Data is received from the mobile station responsive to a signal received by the mobile station over the second air interface from the second base station, substantially without interrupting the communications link with the first base station. The mobile station is handed over from the first base station to the second base station responsive to the data received therefrom.
Abstract:
PROBLEM TO BE SOLVED: To efficiently manage reverse-link resources by allowing a mobile station to select between transmitting a payload at a standard power level and transmitting a smaller payload at a boosted power level. SOLUTION: The mobile station can autonomously select a QoS (quality of service) level for physical layer packets. Based on reverse-link transmission information received from a base station, the mobile station derives a reverse-link transmission guideline defining the power levels and associated payloads for at least a standard service and boosted service. The mobile station selects a reverse-link transmission power level from a plurality of power levels, including at least a standard reverse-link transmission power level associated with a standard payload size and a boosted reverse-link transmission power level associated with a boosted payload size, where the standard payload size is greater than the boosted payload size. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To reduce control overhead to adjust transmission rates.SOLUTION: A first signal indicates an acknowledgement of a decoded subpacket and whether or not a rate control command is generated, and a second signal conditionally indicates the rate control command when one is generated. In another aspect, a grant is generated concurrently with the acknowledgement. In yet another aspect, a mobile station monitors the first signal, conditionally monitors the second signal as indicated by the first signal, and may monitor a third signal comprising a grant. In yet another aspect, one or more base stations transmit one or more of the various signals.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and device for determining a maximum requested rate. SOLUTION: A mobile station is provided with an antenna for receiving and transmitting a plurality of signals, a receiver connected to the antenna and receiving a plurality of signals, a controller connected to the receiver and determining a normalized average pilot transmit power from the plurality of received signals, and determining the maximum requested rate based on the normalized average pilot transmit power and a pilot reference value, and a transmitter connected to the controller and adjusting the maximum requested rate for transmission. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for a time-scalable priority-based scheduler, wherein a flexible scheduling algorithm utilizing variable scheduling durations enables better system capacity utilization. SOLUTION: A rate request 408 is transmitted if data arrives in a buffer, data in the buffer exceeds a buffer depth, and sufficient power exists to transmit at the rate requested. A rate assignment 418 responsive to the rate request indicates a scheduled duration and a scheduled rate applicable for the scheduled duration. The scheduling period is an interval of time after which a scheduler makes a scheduling decision. The scheduling period is variable and the scheduled duration is variable. The scheduler is preferably applied in a UMTS, CDMA 2000 or HDR-system for reverse link rate scheduling. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and system for multilevel scheduling for rate assignment in a communication system. SOLUTION: A method for estimating capacity used on a reverse link includes: measuring a plurality of signal-to-noise ratios at a station for a plurality of rates; determining sector load on the basis of the measured plurality of signal-to-noise ratios, an assigned transmission rate and an expected transmission rate; and estimating capacity on the reverse link on the basis of the sector load. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a reverse link channel structure in which data transmission characteristic in a reverse link has been taken into consideration. SOLUTION: Mechanisms are provided to quickly assign resources (e.g., a supplemental channel) as needed, and to quickly de-assign the resources when not needed or to maintain system stability. The reverse link resources may be quickly assigned or de-assigned by short messages exchanged on control channels on forward and reverse links. A reliable acknowledgment/negative acknowledgment scheme and an efficient retransmission scheme are provided. Mechanisms are also provided to control a transmission power and/or data rate of a remote terminal to achieve high performance and avoid instability. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for controlling data rate of reverse link communications in a communication system.SOLUTION: An efficient use of communication resources is provided by determining behavior for selecting a payload size (data rate) of a reverse link transmission. A mobile station can store a predetermined table including a ratio of power levels of a traffic channel and a pilot channel (TPR), where each entry corresponds to the size of data payload, and consequently to the data rate for transmission in a predetermined time frame. The payload size is selected based on an authorized-TPR. The authorized-TPR and a target-TPR are adjusted in accordance with TPR commands received from a base station. A fast-ramp-up behavior for adjusting the authorized-TPR is performed when the authorized-TPR is less than the target-TPR. A down TPR command is ignored in the adjustments of the authorized-TPR during the fast-ramp-up mode.
Abstract:
PROBLEM TO BE SOLVED: To provide a channel structure and mechanism to support effective and efficient allocation and use of reverse link resources. SOLUTION: The mechanism allocates resources (e.g., a supplementary channel) quickly as needed and releases the allocation of resource quickly when being unnecessary. The reverse link resource is allocated quickly by short messages 412, 418 which are exchanged on control channels on the forward direction and reverse direction, or its allocation can be released. Then, a reliable yes/no response system and efficient retransmission system are provided. To achieve high performance and prevent instability, a transmission power to a remote terminal and/or mechanism to control a data rate are provided. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus, system, and method for efficiently managing reverse link communication in a communication system having geographically distributed base stations. SOLUTION: A non-servicing base station determines a coupled load indicator detected in the non-servicing base station by a mobile station identified as a servicing base station, and transfers the determined couple load indicator to the servicing base station. The servicing base station calculates a coupled load in the non-servicing base station. A mobile station serviced by a base station without being serviced is subjected to load scheduling according to usable capacity. COPYRIGHT: (C)2011,JPO&INPIT