CAPWAP

Abstract: A wireless local area network (WLAN) system comprises multiple access points that are distributed throughout a medical facility to provide wireless access to a hardwired network. The access points implement multiple WLAN protocols, including a realtime protocol for realtime patient monitoring (telemetry) and a standard WLAN protocol (such as IEEE 802.11 within an ISM band) for providing general-purpose wireless access. Some or all of the access points preferably implement both WLAN protocols such that the different WLANs and wireless device types share network access resources. Some or all of the access points may also include RF location-tracking modules which may be used to track locations of patients, hospital personnel, capital equipment, and/or disposable medical supplies. Also disclosed are an antenna design which may be used with the access points to improve reception (particularly for patient monitoring), and a TDMA timeslot rotation method for avoiding lockstep interference between access points that operate on the same channel.

Abstract: Devices, systems and methods of presentation of delivering targeted advertisements using Wireless Application Protocol. For example, a wireless communication device includes: a server to receive a request transmitted by a wireless communication device using Wireless Application Protocol (WAP) to access a WAP-page of a WAP-site, the server to select an advertisement based on a property selected from a group consisting of: a property of said wireless communication device, and a property associated with a user of said wireless communication device, and the server to serve the advertisement to said wireless communication device using WAP in response to said request.

Abstract: Understanding usage patterns in wireless local-area networks (WLANs) is critical for those who develop, deploy, and manage WLAN technology, as well as those who develop systems and application software for wireless networks. This paper presents results from the largest and most comprehensive trace of network activity in a large, production wireless LAN. For eleven weeks we traced the activity of nearly two thousand users drawn from a general campus population, using a campus-wide network of 476 access points spread over 161 buildings at Dartmouth College. Our study expands on those done by Tang and Baker, with a significantly larger and broader population.We found that residential traffic dominated all other traffic, particularly in residences populated by newer students; students are increasingly choosing a wireless laptop as their primary computer. Although web protocols were the single largest component of traffic volume, network backup and file sharing contributed an unexpectedly large amount to the traffic. Although there was some roaming within a network session, we were surprised by the number of situations in which cards roamed excessively, unable to settle on one access point. Cross-subnet roams were an especial problem, because they broke IP connections, indicating the need for solutions that avoid or accommodate such roams.

Abstract: The vision is tantalizing: a high-performance, scalable, and widely deployed wireless Internet that facilitates services ranging from radically new and unforeseen applications to true wireless "broadband" to residences and public spaces at rates of 10s of Mb/sec. However, while high-speed wireless access is easy to achieve in an enterprise network via low-cost IEEE 802.11 (WiFi) access points, wireless technology in public spaces is in its infancy. "Hot spots" provide high-speed wireless access, but do so in very few isolated "islands" at immense costs. Likewise, while fixed wireless (e.g. LMDS) and 3G can provide ubiquitous coverage and 3G can support mobility, throughputs can often be two orders of magnitude slower than WiFi.In this paper, we formulate the challenges of building a high-performance, scalable and widely deployed wireless Internet along 10 premises. We make the case for the requirement of a fundamental new architecture based on beamforming antennas deployed on fixed, wire-powered Transit Access Points (TAPs) that form a multi-hopping wireless backbone with a limited number of wired ingress/egress points. To address scalability, deployability, and performance challenges we present distributed, opportunistic and coordinated resource management problems and a novel "network is the channel" framework that searches for fundamental information-theoretic tradeoffs between protocol overhead and capacity.