238_1_lecture_6 - EE 238: Multimedia communications and...

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EE 238: Multimedia communications and processing Prof. Mihaela van der Schaar email: mihaela@ee.ucla.edu www-page: www.ee.ucla.edu/~mihaela
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Lecture 6: Multi-user resource management for multimedia communications
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Outline Motivation and challenges Multi-user communications and networking interactions Strategic multi-user interactions as games Repeated and stochastic games Opportunities and remaining challenges Questions/comments/observations are always encouraged, at any point during the lecture!!
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Goal of this lecture Goal – Introduce Theories, Principles and Algorithms for Efficient Multi-User Communications and Networking Network side: Determine rules for efficiently and fairly implementing the resource division and/or competition among the users sharing the same network resource User side: Determine optimal transmission strategies for users to maximize their own utility (given network imposed rules)
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Multi-user communication framework Some examples: -Multi-user spectrum/network resource access - Centralized (coordinated) resource allocation - Decentralized access - Cognitive radios – opportunistic spectrum access - Peer to peer resource reciprocation - Multi-user multi-hop resource reciprocation (e.g. relaying) Network resource W n n a n u Utility User m m a Action m u Information m k knowledge n k Action Utility Policy m π n π knowledge Information
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Direction of wireless solutions Mbit/s 1 10 100 0,1 Outdoor Stationary Walk Vehicle Indoor Stationary/ Desktop Walk Mobility HiperLAN/2 IEEE802.11a User Bitrates LAN 3G cellular Bluetooth 2G cellular Wide Area Network (WAN) -Large coverage -High cost Personal Area Network (PAN) - Connectivity - Cable replacement - Low cost Local Area Network/Access - Hot Spots - High speed - Moderate cost
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Overview of IEEE 802.11 Working Groups 802.11 PHY 802.11 MAC higher layers IEEE 802.11e – QoS IEEE 802.11h – Transmit Power Control and DFS IEEE 802.11i – Security IEEE 802.11k – Radio Resource Measurements IEEE 802.11n – High Throughput MAC IEEE 802.11c – Bridging Functions IEEE 802.11d – International Roaming IEEE 802.11f – Inter Access Point Protocol IEEE 802.11a – 5 Ghz at 54 Mb/s IEEE 802.11b – 2.4 Ghz at 11 Mb/s IEEE 802.11g – 2.4 Ghz at 54 Mb/s IEEE 802.11n – MIMO PHY
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Resource Management in Current Wireless Networks Example: MAC protocol in current wireless LANs ( IEEE 802.11a/b/g/e ) Distributed: Ad-hoc mode – e.g. Distributed Coordination Function (DCF) CSMA/CA (contention-based channel access) Symmetric traffic load Centralized: Infrastructure mode – e.g. Point Coordination Function (PCF) or Hybrid Coordination Function (HCF) Polling-based (contention free) channel access Central Spectrum Moderator (CSM) required Asymmetric traffic load (e.g. multimedia) Access Point (AP) Basic Service Set (BSS) Independent Basic Service Set (IBSS)
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How are resources divided among multiple users?
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This note was uploaded on 10/19/2011 for the course ELECTRICLA 216A taught by Professor Marković during the Fall '10 term at UCLA.

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238_1_lecture_6 - EE 238: Multimedia communications and...

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