Motorola Corporation

Motorola Mobility LLC

Google Inc.

Hua Xu

John McFarland Harris

Xiao Xu

Fuyun Ling

Amitava Ghosh

Timothy J Wilson

Sean S Kelley

Irfan Ali

William N Shores

Stavros Tzavidas

A method and apparatus for optimizing target error rates for link adaptation in a communication system. The method includes estimating a data rate associated with transmission of a data stream over a communication link. A required target error rate is then selected from a plurality of pre-defined target error rate values based on whether the estimated data rate is within a range of at least one of a plurality of pre-defined threshold values, where each of the pre-defined target error rate values maps to one of the plurality of pre-defined threshold values. A link adaptation parameter associated with the communication link is then selected or updated to maintain the required target error rate and the data stream is transmitted over the communication link using the selected/updated link adaptation parameter.

Method and apparatus for optimizing target error rates for link adaptation in a communication system

A method, a system and a base-station for automatically determining delays of data transmitted via Transmission Control Protocol (TCP) and inflating these delays in order to reduce jitter and improve TCP throughput in a communications network. A Dynamic Jitter Reduction (DJR) logic/utility operating within a communications node measures delays on a rolling basis in order to capture the delay profile. Based on the delay profile, the DJR utility determines a delay target. The DJR utility 'inflates'/augments future/expected delays toward the delay target by performing on one or more of the following: (a) using a delay based factor in the scheduler metric for TCP applications; (b) performing fine-tuning of link adaptation schemes; (c) delaying transmission of packets at the transmit or receive buffer; and (d) delaying transmission of a received TCP ACK signal from the media access control (MAC) sub-layer to TCP layer.

Artificial delay inflation and jitter reduction to improve TCP throughputs

An apparatus and method for increasing Scheduling Request efficiency in a wireless communication system includes a stepof configuring periodic timing opportunities for sending the scheduling request. A next stepincludes detecting new data arriving in an empty queue to trigger a scheduling request. A next stepincludes sending a scheduling request at selected SR opportunities until a response to the scheduling request is generated.

Increasing scheduling request efficiency in a wireless communication system

Various embodiments are described for establishing a group call session serially. After receiving a serial group call request from a remote unit (), fixed network equipment (FNE) () selects a first subset of members () from the targeted group () of units and signals those members to join the group call session. Various techniques for selecting the first subset may be employed depending on what system benefits are desired. A second subset of members () from the targeted group of units is also selected and signaled to join the session. This second subset may be used to invite additional units in order to achieve a maximum number of group participants. Alternatively, the second subset may be used to invite a different unit (or units) to participate. This can be triggered by a user request to invite another subset to the group session, as could occur when the user is not able to resolve the particular matter at-hand with the group members of the first subset.

Method and apparatus for serially establishing a group call session

A communication system and method assigns, such as by marking headers of wireless communication packets, packet classification data to packets to define at least one of the following classes: a control signaling class, such as in-band signaling and control packets, a voice class, a data retransmission class, OAMP class and a data class and wherein each class represents a different transmission priority over a backhaul link. For wireless communication packets associated with the control signaling class and the voice class, the method and apparatus assigns each of the wireless communication packets with additional drop precedent data wherein the drop precedence data defines a further packet drop priority within the control signaling class and the voice class. The apparatus and method drops a queued classified wireless communication packet based on a priority level of assigned drop precedent data and based on the packet classification data.

Method and apparatus for enhancing the quality of service of a wireless communication

The present invention provides a method and apparatus for group calls in wireless CDMA communication systems, addressing the need for reliable and efficient reverse power control in CDMA group calls. A communication infrastructure (,) upon receiving a group call request from a communication unit (e.g.,,), allocates a single voice channel (e.g.,,) in each cell that provides service to one or more communication units of the group (,). The communication infrastructure further allocates a reverse power control channel (e.g.,,) to each communication unit of the group. Thus, each communication unit of the group receives voice information for the group call via the voice channel in that communication unit's site or cell, and each communication unit receives inbound (i.e., reverse) power control information via the reverse power control channel allocated to that communication unit. In this manner, the present invention efficiently provides reverse power control information to multiple communication units and, therefore, facilitates the establishment of group calls in CDMA systems.

Method and apparatus for group calls in a wireless CDMA communication system

The present invention is a method and apparatus for decoding a coded signal in a communication system. The coded signal is processed through digital signal processing to produce decision metrics representing the coded signal, and the metrics are scaled according to a soft-limiting function before being received by a decoder for decoding the coded signal. The soft-limiting function is a piecewise linear function, a piecewise nonlinear function, or a combination of piecewise linear and nonlinear functions. The soft-limiting, in the alternative, is performed on a result of a weighting function performed, in parallel of the decision metrics, on the coded signal. The result of the soft-limiting is then multiplied with a result of the decision metrics prior to the decoder. The decoder may a Viterbi decoder while the communication system may be a Code Division Multiple Access (CDMA) communication system.

Growing community of inventors

Lake Zurich, IL, United States of America

Hua Xu