公开(公告)号：DE60105643D1

公开(公告)日：2004-10-21

申请号：DE60105643

申请日：2001-11-09

Applicant: IBM

Inventor： SALONIDIS THEODOROS ,  BHAGWAT PRAVIN ,  LAMAIRE O

IPC: H04L12/28 ,  H04B7/24 ,  H04L12/56 ,  H04L29/08

Abstract: A method for connecting two or more devices via a wireless communication channel is provided. In one embodiment, a method of connecting a first device to a second device includes the steps of arbitrarily assigning one of two possible states to each device, wherein in a first state, a device seeks to establish a connection with another device, and in a second state, the device renders itself available for connection with the other device; and alternating a present state of each device between the first state and the second state in accordance with a predefined probability distribution until either a predetermined timeout period has expired or a connection between the devices has been established, the length of time that each device remains in the first and second states being controlled by the probability distribution. In a second embodiment, a method of forming a scatternet between a plurality of devices or nodes in an ad hoc wireless communication network is provided.

公开(公告)号：AT274207T

公开(公告)日：2004-09-15

申请号：AT99307580

申请日：1999-09-24

Applicant: IBM

Inventor： BHAGWAT PRAVIN ,  HAN RICHARD YEH-WHEIN ,  LA MAIRE RICHARD ,  MUMMERT TODD WILLIAM ,  RUBAS JAMES

IPC: G06F15/16 ,  G06F17/30 ,  H04L29/06 ,  H04L29/08 ,  H04N7/26 ,  H04N21/6377 ,  H04N21/658

Abstract: The present invention provides methods, devices and systems for dynamically adjusting transcoding parameters so as to increase the benefits of transcoding. Methods of adaptation are designed to cope with the variability of network characteristics and of the size of transcoded images. The invention also provides a method and apparatus to enable the transcoding proxy to adjust a quality-size tradeoff on a per-image and/or a per-client basis. The adaptive transcoder chooses different parameters for each object, and provides performance improvements. The invention further provides a general framework for making policy decisions taking into account available bandwidth, content and type of image, and user preferences. The invention also includes methods for generating feedback about the choice of optimal transcoding parameters to the user.