Abstract:
PROBLEM TO BE SOLVED: To resolve confusion resulting from assigning the same identifier to multiple nodes.SOLUTION: A network may provide a time gap during which an access terminal may temporarily cease monitoring transmissions from a source node so that the access terminal may acquire a unique identifier from a target node. An access terminal may commence handover operations at a target node after determining whether the access terminal is allowed to access the target node. A source node may prepare several target nodes for potential handover in the event confusion is detected or likely. The source node may send information relating to the preparation of the potential target nodes to the access terminal, and thereby the access terminal initiates handover at that target node.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of selecting a sleep interval in a mobile communication device.SOLUTION: A mobile communication device that is capable of accessing different types of networks such as a circuit-switched network and a packet-switched network negotiates, while communicating over the packet-switched network, a sleep interval that is longer than the ordinary sleep interval available using the packet-switched network. In this manner, the device wakes less frequently and thereby conserves power. A buffering system is included so that data directed towards the device while the device is asleep is delivered later when the device awakens.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques to efficiently schedule and serve stations in a wireless network.SOLUTION: An access point may aggregate stations with flows carrying traffic having similar characteristics, e.g., VoIP flows. The access point may schedule these stations together in an overall service period. The access point may serve each station in a respective service period within the overall service period. The access point may send a multi poll frame at the start of the overall service period to indicate the start time and/or service period for each station. Each station may decide to power down until its start time. The service periods for the stations may overlap one another. The service period for each station may cover an initial transmission as well as additional transmission and/or retransmission.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for performing open-loop rate control in a TDD communication system. SOLUTION: In the open-loop rate control, the channel quality of a first link (B, A) is estimated based on a transmission received via the first link (B, A). The channel quality of a second link (A, B) is estimated based on the estimated channel quality of the first link (B, A) and an asymmetric parameter. A rate for a data transmission via the second link (A, B) is selected based on the estimated channel quality of the second link (A, B). The estimated channel quality for each link may be given by a set of SNR estimates for a set of transmission channels on that link. The asymmetric parameter may be determined based on (1) the capabilities (e.g., transmission power, receiver noise figure, and number of antennas) of the transmitting and receiving stations or (2) received SNRs for the first link (B, A) and second link (A, B). COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for sending a message for random access by user equipment (UE).SOLUTION: The UE sends the message on a control channel for random access and sends a reserved channel identifier to indicate the message being sent on the control channel. In another aspect, the UE sends the message in a protocol data unit (PDU) and sends additional information in the PDU if the UE can accommodate to the additional information. In yet another aspect, the UE generates a short MAC-I (message authentication code for integrity protection) for the message. The short MAC-I may have a smaller size and may be used to authenticate the UE. In yet another aspect, the UE sends a UE ID for one of multiple types of random access and conveys the UE ID type via a format field in the message.
Abstract:
PROBLEM TO BE SOLVED: To facilitate increased communication channel bandwidth efficiency in association with scheduled time periods that allocate channel access to particular stations.SOLUTION: Systems and methods are described that facilitate providing and/or utilizing reverse direction grants in connection with scheduled channel access. Such systems and/or methods can mitigate the total amount of unused channel access time after a station completes data transmission prior to an end of the allocated period.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques to support beamforming for stations in a wireless network.SOLUTION: A station A sends a first frame with a request for explicit feedback and also sends a Null Data Packet (NDP) having at least one training field but no data field. A station B generates the explicit feedback on the basis of the NDP, and sends a frame with the explicit feedback. The station A receives the frame, derives steering information (e.g., steering matrices) on the basis of the explicit feedback, and sends a steered frame with beamforming on the basis of the steering information. The station may also perform implicit beamforming using NDP for sounding.
Abstract:
PROBLEM TO BE SOLVED: To provide a data packet communication system which enables Automatic Repeat Request (ARQ) whereby polling of a receiver is accomplished with a reduced amount of redundantly transmitted data.SOLUTION: Upon a polling event, such as emptying of a transmission buffer of a transmitter, expiration of a polling timer, or reaching a radio link control (RLC) protocol data unit (PDU) count threshold, the transmitter sends a polling command to a receiver. This polling command is smaller than any of the RLC PDUs by resegmenting to a variably sized PDU sending a reduced amount of data. With evolving communication standards tending toward larger PDUs, such as in excess of a kilobyte for HSPA+ (High-Speed Packet Access Evolution) and 3GPP LTE (Long Term Evolution), this inefficiency can be of increasing impact.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques used when packets to be sent from a base station to user equipment (UE) are partly left unsent in a source base station because of handover, to send these residual packets to the UE and to maintain synchronization during the handover.SOLUTION: A source base station 120 may forward residual packets to a target base station, which may receive the out-of-order residual packets. The target base station 122 may determine whether each packet can be sent to UE 110 in order, send the packet if it can be sent in order, and discard the packet otherwise. In another design, the target base station may re-order packets received within a re-ordering window and may send the re-ordered packets to the UE.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for performing open-loop rate control in a TDD communication system.SOLUTION: The channel quality of a first link is estimated based on a transmission received via the first link (114). The channel quality of a second link is estimated based on the estimated channel quality of the first link and an asymmetric parameter (116). At least one rate for a data transmission via the second link is selected based on the estimated channel quality of the second link (118). The estimated channel quality for each link may be given by a set of SNR estimates for a set of transmission channels on that link (120). The asymmetric parameter may be determined based on (1) the capabilities (e.g., transmit power, receiver noise figure, and number of antennas) of the transmitting and receiving stations or (2) received SNRs for the first and the second links.