Qualcomm

About: Qualcomm is a company organization based out in Farnborough, United Kingdom. It is known for research contribution in the topics: Wireless & Signal. The organization has 19408 authors who have published 38405 publications receiving 804693 citations. The organization is also known as: Qualcomm Incorporated & Qualcomm, Inc..

Optimal Delay–Throughput Tradeoffs in Mobile Ad Hoc Networks

Abstract: In this paper, we investigate the delay-throughput tradeoffs in mobile ad-hoc networks. We consider four node mobility models: 1) two-dimensional independent and identically distributed (i.i.d.) mobility, 2) two-dimensional hybrid random walk, 3) one-dimensional i.i.d. mobility, and 4) one-dimensional hybrid random walk. Two mobility time scales are included in this paper. i) Fast mobility, where node mobility is at the same time scale as data transmissions. ii) Slow mobility, where node mobility is assumed to occur at a much slower time scale than data transmissions. Given a delay constraint D , we first characterize the maximum throughput per source-destination (S-D) pair for each of the four mobility models with fast or slow mobiles. We then develop joint coding-scheduling algorithms to achieve the optimal delay-throughput tradeoffs.

Ip broadcast streaming services distribution using file delivery methods

Abstract: In one example, a device includes one or more processing units configured to send, via a network, a request to retrieve at least a portion of media content, wherein the media content conforms to dynamic adaptive streaming over HTTP (DASH), and wherein the request comprises a request that the at least portion be delivered according to a file delivery service, and, in response to the request, to receive streaming data for the at least portion of the media content in accordance with the file delivery service over the network. The device may prepopulate a browser cache with the received data, such that a browser can, in effect, stream data using the file delivery service. The device may initially retrieve data of the media content using unicast, until a switch point of the data received via the file delivery service is reached.

Rate selection for an ofdm system

Abstract: Techniques to determine the rate for a data transmission in an OFDM system. The maximum data rate that may be reliably transmitted over a given multipath (non-flat) channel by the OFDM system is determined based on a metric for an equivalent (flat) channel. For the given multipath channel and a particular rate (which may be indicative of a particular data rate, modulation scheme, and coding rate), the metric is initially derived from an equivalent data rate and the particular modulation scheme. A threshold SNR needed to reliably transmit the particular data rate using the particular modulation scheme and coding rate is then determined. The particular rate is deemed as being supported by the multipath channel if the metric is greater than or equal to the threshold SNR. Incremental transmission is used to account for errors in the determined data rate.

Resource coordination for peer-to-peer groups through distributed negotiation

Abstract: Techniques for determining resources to use for peer-to-peer (P2P) communication are disclosed. In an aspect, a network entity may receive feedback information (e.g., resource usage information and/or channel state information) from P2P devices and may perform resource partitioning based on the feedback information to allocate some of the available resources for P2P communication. The allocated resources may observe little or no interference from devices engaged in wide area network (WAN) communication. In another aspect, P2P groups may perform resource negotiation via a WAN connection (e.g., with little or no involvement by the WAN) to assign the allocated resources to different P2P groups. In yet another aspect, a device may autonomously determine whether to communicate with another device directly or via a WAN, e.g., whether to initiate P2P communication with another device and whether to terminate P2P communication. In yet another aspect, a network entity may participate in resource negotiation by P2P devices.

Distributed illumination system

Abstract: The present invention introduces a new class of lightweight tile-based illumination systems for uses wherein thin directionally-illuminating light distributing engines are embedded into the body of otherwise standard building materials like conventional ceiling tiles along with associated means of electrical control and electrical power interconnection. As a new class of composite light emitting ceiling materials, the present invention enables a lighter weight more flexibly distributed overhead lighting system alternatives for commercial office buildings and residential housing without changing the existing materials. One or more spot lighting, task lighting, flood lighting and wall washing elements having cross-sectional thickness matched to that of the building material or tile into which they are embedded, are contained and interconnected within the material body's cross-section. Embedded power control devices interconnected to each lighting element in the distributed system communicate with a central switching center that thereby controls each light-emitting element in the system.