Adequacy Between Multimedia Application Requirements And Wireless Protocols Features Antoine Mercier,Ecole Centrale D`Electronique Paccale Minet, Inria Laurent George And Gilles Mercier,LIIA 報告者: 陳冠男 2018/11/13 G.N.Chen@CCU

Outline Introduction Background (Comparative Criteria) Recently wireless standard Open issue Conclusion 2018/11/13 G.N.Chen@CCU

Introduction MAC protocols and their ability Quality of Service view User view 使用者希望更高等級 Network view 管理實際QoS等級 Random access mode asynchronous traffic Polling mode real time synchronous traffic 2018/11/13 G.N.Chen@CCU

Comparative Criteria Device roaming Mobility of device Power management Number of interconnected device Frequency band Security (WEP) Cost 2018/11/13 G.N.Chen@CCU

Comparative Criteria Need for infrastructure or not Centralized or decentralized Hidden node problem 2018/11/13 G.N.Chen@CCU

Hidden node problem Hidden problem會影響效率及浪費頻寬 2018/11/13 G.N.Chen@CCU

IEEE802.11 Ad Hoc Mode / With AP Data transmission Asynchronous (DCF) Synchronous (PCF) Reduce Hidden node program Request To Send / Clear To Send CSMA/CA 2018/11/13 G.N.Chen@CCU

IEEE 802.11 (wireless LAN) Topology AP Basic Service Set (BSS) Basic Service Set (BSS) Distribution system (can be any type of LAN) Access Point (AP) Independent Basic Service Set (IBSS) Also ad hoc network Infrastructure Ad hoc network 2018/11/13 G.N.Chen@CCU

IEEE802.11 service type 2018/11/13 G.N.Chen@CCU

802.11 hidden program solution CSMA/CA 2018/11/13 G.N.Chen@CCU

Bluetooth 同步連結導向連結（SCO）- Data Bursts 非同步非連結導向連結（ACL） 涵蓋低成本,低電力無線電介面的PAN Setup an Ad Hoc connection piconet scatternet Hidden node program frequency hopping Communication time division duplex (TDD) 連線形式 同步連結導向連結（SCO）- Data Bursts 非同步非連結導向連結（ACL） 2018/11/13 G.N.Chen@CCU

藍芽的Data Transmission 2018/11/13 G.N.Chen@CCU

Bluetooth 網路連線方式 Master/Slave model Topology in Bluetooth Two or more devices sharing the same channel form a piconet. Two or more piconets form a scatternet. Slave Master Master (control channel access) Slave Slave Slave Slave Slave Slave piconet scatternet 1 master up to 7 slaves 1. up to 256 piconets 2. Different hoping sequence at different net 2018/11/13 G.N.Chen@CCU

HomeRF 在家庭區域範 圍之內的任何地方，在PC和家用電器之間實現無線數位通信. 簡化的IEEE802.11通訊協定 Ad hoc 語音終端設備 採用TDMA 資料節點設備 採用CSMA/CA Ad hoc Data only With AP Both voice and data 2018/11/13 G.N.Chen@CCU

HomeRF Hidden problem Synchronous traffic Asynchronous traffic unique AP, not available -ad hoc mode Synchronous traffic TDMA Asynchronous traffic CSMA/CA 2018/11/13 G.N.Chen@CCU

HomeRF MAC frame 2018/11/13 G.N.Chen@CCU

HiperLAN/1 5GHz, 23.5Mb/s EY-NPMA solution for hidden CSMA like, with active signaling 2018/11/13 G.N.Chen@CCU

HiperLAN/2 5GHz, 54Mb/s Infrastructure based Connection oriented link 2018/11/13 G.N.Chen@CCU

Mac frame in HIPERLAN/2 2018/11/13 G.N.Chen@CCU

Wireless protocol comparison 2018/11/13 G.N.Chen@CCU

Wireless protocol comparison 2018/11/13 G.N.Chen@CCU

Wireless protocol comparison 2018/11/13 G.N.Chen@CCU

Open Issue MAC access scheme Routing and mobility 異質網路相連 處理hidden node問題 同步與非同步traffic real time / no real time Routing and mobility QoS routing 移動與確保網路的QoS 異質網路相連 存在多種不同的wireless product 2018/11/13 G.N.Chen@CCU

Conclusion Five wireless protocol 頻寬與mobility漸增 Interesting issue Hidden problem MAC frame 頻寬與mobility漸增 Interesting issue 整合不同的wireless protocol 2018/11/13 G.N.Chen@CCU