Abstract: The present invention provides a system and method for optimizing utility in a wireless data system. A connection is first established with a plurality of receiver devices. After the connection has been established, feedback is received from the receiver devices at periodic intervals, wherein the feedback includes channel quality information. A map is computed for each of a plurality of modulation and coding schemes (MCSs) using the received feedback, wherein the map associated with each MCS reflects the set of receiver devices capable of receiving that particular MCS. Once the MCSs have been mapped, one of the MCSs is assigned to each of a plurality of variable-sized layers of at least one video session for optimizing total system utility. If the wireless system has multiple sessions, resources are also allocated among the different sessions in a manner which further optimizes system utility.

Abstract: Rate matching and rate shaping methods and systems for managing data traffic on wireless channels are disclosed. Rate matching embodiments dynamically determine downlink video data transmission rates based on frame decoding deadlines and frame sizes. In addition, if the channel capacity cannot support the video data transmission rate, the rate matcher can adjust the video stream accordingly so that it is supportable by the channel capacity. In turn, rate shaping implementations can tailor the transmission rate shaping based on the state of the wireless data channel. Shaper operations can be specifically adapted to a saturated state of the wireless channel, to an unsaturated state of the wireless channel and to transitions between the unsaturated and saturated states.

Abstract: A method and apparatus are provided for streaming scalable video over fading wireless channels. The method includes building a model relating to a relationship between an average data rate and an average peak signal-to-noise ratio for a video sequence encoded using scalable video coding and having a base layer and one or more enhancement layers. The method also includes computing a vector relating to a set of average data rates for a particular boundary point on an achievable rate region for a transmission strategy. The boundary point is a function of a parameter set for a plurality of users. The achievable rate region is based upon the model. The method further includes scheduling the plurality of users to receive the video sequence over a wireless channel, such that at a given transmission time slot a particular one of the plurality of users associated with a maximum value is selected. The maximum value is based on the vector and a channel capacity available to the particular one of the plurality of users.

Abstract: Systems and methods are disclosed for transmission with a plurality of base stations (BSs) in a wireless cellular data network where one BS communicates with neighboring BSs by determining a binary or discrete new power level on each subchannel to determine a weighted sum modified rates of a BS and in-neighbor BSs; and resolving concurrent power update in each BS in a distributed manner.

Abstract: Transmission is scheduled in a multi-cell multi-carrier wireless network. Assignments are determined for subcarriers by determining marginal gains for receivers, determining a receiver and an associated base station corresponding to a highest marginal gain, and assigning the receiver to the base station. These steps may be iteratively repeated until each of the receivers is assigned to a base station. The subcarriers are then allocated to the receivers by selecting the receiver with the highest gain. Alternatively, assignments are determined for subcarriers by determining a maximum additional queue size reduction, determining an assignment for each of the subcarriers, determining a receiver associated with a base station that has the determined maximum additional queue size reduction, assigning the receiver to the base station, and allocating the subcarriers to the receivers in the base stations.

Abstract: An adaptive scheduling process is disclosed which dynamically decides which frames need to be transmitted and which ones need to be dropped at any transmission opportunity based on current channel conditions and on characteristics of each video frame.