The Personal Access Communications System (PACS) is an American National Standards Institute common air interface standard developed for the 1.9 GHz PCS band in the United States. PACS uses frequency division duplexing technology and is optimized to support low-mobility pedestrian outdoor usage and uireless local loop applicaiioni in a medium-range environment. PACS-Unlicensed B (PACS-UB) is a version of PACS using time division duplexing. PACS-UB has been optimized for private, indoor wireless PBX applications and cordless telephony. Both modes of operation are supported using the same portable hardware and the same signaling protocol.
A handover is required in wireless personal communications systems when a portable moves from one base station coverage area to another during the course of a conversation. In general, the handover should be completed while the portable is in the overlap reglon to be successful This article considers several issues for handover management, handover detection, channel assignment, and radio link transfer. OERPEL, HUGHES NETWORK SYSTEMS ATIONAL CHIAO TUNG UNIVERSITY n a personal communications services (PCS) system, it is important to support services when a subscriber moves from the coverage area of one base station to that of another. This process is referred to as small-scale mobility management or handover management. To illustrate the handover behavior, let us consider an example in Fig. 1. This figure shows three radio base stations and their coverage areas (or cells). Even though cellular base station towers are shown, this discussion is general and applies to both high-tier cellular systems and low-tier pedestrian systems, and to both indoor and outdoor environments. A mobile phone or portable (represented by a vehicle in the figure) is shown traversing these areas. Coverage areas are irregular because of buildings, trees, mountains, and other terrain features, and sometimes they may considerably overlap. A handover is required in mobile or portable communications systems when a portable moves from one base station coverage area to another during the course of a conversation. In general, the handover should be completed while the portable is in the overlap region to be successful. As a portable Biographies ANTHONY NOERPEL'S
This paper describes a polling deregistration protocol for a wireless access communications network which would support interoperability between licensed personal communications services (PCS) and unlicensed-PCS (UPCS). We show how the protocol can be efficiently implemented in the personal access communications system (PACS) for licensed PCS and in the PACS-Unlicensed Version B (PACS-UB). An analytical model is proposed to analyze the performance of the polling protocol.A cost function is derived, which can be used to estimate the optimal polling frequency.
We describe recent progress in development and standardization of two Geostationaiy Mobile Satellite Systems (GMSS). These standards, denoted GMR-I and GMR-2, for Geo Mobile Radio 1 and 2, were developed jointly in both US (TU) and European (ETSI) standards bodies and he complete set of standards have recently been published. In parallel, two regional Geostationaly Mobile Satellite Systems using these standards have been launched and have commenced service. The Thurqa system, using GMR-1, serves a region centered in the Middle East, and the Asia Cellular System (Aces) system, using GMR-2, serves a region in Southeast Asia. This paper describes the key features of both systems, and the status of current and future GMSS standards.
Wireless local loop (WLL) provides two-way calling services to the stationary or "fixed" users, which is intended to replace its wireline counterpart. Today, there are almost 100 WLL systems (either trials or commercial systems). This article describes the WLL, architecture, the WTJ, technologies, WTL service descriptions, and some examples of WLL products.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.