We have been witnessing in the past few years the rapid growth of wireless data applications in the commercial market thanks to the advent of wireless devices, wireless highspeed networks, and supporting software technologies. We envisage that in the near future, a large number of mobile users carrying portable devices (., palmtops, laptops, PDAs, WAP phones, etc.) will be able to access a variety of information from anywhere and at any time. | Handbook of Wireless Networks and Mobile Computing Edited by Ivan Stojmenovic Copyright 2002 John Wiley Sons Inc. ISBNs 0-471-41902-8 Paper 0-471-22456-1 Electronic CHAPTER 11 Data Broadcast JIANLIANG XU and DH -LL IM l_EEE Department of Computer Science Hong Kong UnivercityofScKnce andTechnology QINGLONG HU IBM Silicon ValleyLaborrtorySanJose California WANG-CHIEN LEE Verizon Laboratories Waltham Massachusetts INTR ODUCTI ON We nobG nwitnessing in the past few years the rapid growth of wireless data applica-tionsm the commercialmarketthanlcstothe advent of wireless devices wireless highspeed networNs and supporting software technologies. We envisage that in the near future a htt ge munbecof mobfteusnnscarrying portable devices . palmtops laptops PDAs WAP phones etc. will be able to access a variety of information from anywhere and at any time. The types of information that may become accessible wirelessly are boundless and include news stock quotes airline schedules and weather and traffic information to name butafew There are two fundamental information delivery methods for wireless data applications p access a logicalchanneiis es-tablishedbetween theclientarndtheserver. QuesopsonbcuPnutted-otheserpcrandresuhs arero-onipatothoo llenlar mnchchc samewoaanm a w-sednonwork. In bneadca-C daSa oresne-siinuStabc-nirly toal ii-ets redding tn tUbUpoedcastateis Ittaup totSn dient to select lhenura atwants. hater we witleerthat tn a spr cisOgitnloS broaacasl syctem romr-ly ssnsecmand elicntcanalso submit euoriestoUhecsrverao-naS theOoSell wantseseguorpnterdtobebnuadcasS. t ou u s n- i th point-to-point access broadcast is a more attractive method for several reaT r e ss Asingle UcbadcestnfaOara idem r aneetirlyal. the otnstabding requesrsfor thpl iteoloiimthenes aroadcprt sanss-le uo o pis erbitrurgnumbeonO osere. MubttewtrelrssenvirobmentsarachínpsScrirnUbypsnomceU ircommlmicption . the dow
