CSci 8980 Mobile Cloud Computing. MCC Overview

Transcription

1 CSci 8980 Mobile Cloud Computing MCC Overview

2 Papers Students can do: 1 long paper or 2 short papers Extra credit: add another By 8am tomorrow, I will randomly assign papers unless I hear from you Protocol: Send me PPT slides prior to class

3 Blogs Maui blog critique: Rohit/Yongbo Assigned tomorrow Cuckoo Weblet Tactics JIT cloudlet Sharing-based CloneCloud Comet

4 Blog Critique Overview: problem and solution (very short 1-2 paras max) Pros, Cons, and any questions raised Due on-line the day before the talk is given

5 Big Picture The Cloud Network Fabric

6 Bridging the Capability Gap As the Smartphone becomes the primary computing device Capability What users will want What the device is capable of Time

7 What users want: Motivation Imaging Processing OCR Natural Language Crowd computing: lost child Sharing data Sensor data applications: congestion dist? Multimedia search Social networking Server Avoidance

8 Challenges

9 Energy Constraint Battery Life Intelligently use peripherals and sensors to reduce energy consumption Opportunity: Multiple peripherals and sensors

10 Performance End-user latency critical for highly interactive applications both latency and deadlines As mobile apps move into the critical path, timing becomes more important video perception

11 Solution Mobile Cloud Computing (MCC) to the rescue! Simple Definition of MCC: Infrastructure where both the data storage and data processing happen outside of the mobile device.

12 Questions How does it differ from cloud computing? not batch, latency, battery, FT, What are the approaches? How does offloading relate to traditional distributed computing? Incentives for mobile participation? How to determine context?

13 MCC Popularity According to a recent study by ABI Research, more than 240 million customers will use cloud services through mobile devices by That traction will push the revenue of mobile cloud computing to $5.2 billion. Mobile cloud computing is a highly promising trend for the future of mobile computing.

14 Advantages of MCC Extending battery lifetime: Computation offloading migrates large computations and complex processing from resource-limited devices (i.e., mobile devices) to resourceful machines (i.e., servers in clouds) Remote application execution can save significant energy Many mobile applications gain advantage from task migration and remote processing

15 Advantages of MCC Improving data storage capacity and processing power MCC enables mobile users to store/access large data on the cloud MCC helps reduce the running cost for data+computation intensive applications Mobile applications are not constrained by storage capacity as their data now is stored on the cloud

16 Advantages of MCC Improving reliability and availability Keeping data and applications in the cloud reduces the chance of loss on the mobile devices MCC can enhance device?security? by: Protecting copyrighted digital content in the cloud Providing security services such as virus scanning, malicious code detection, authentication for mobile users With data and services in the cloud, they are?always available? even when the users are moving Availability vs. Durability

17 Advantages of MCC Dynamic provisioning Dynamic on-demand provisioning of resources on a fine-grained, self-service basis No need for advanced reservation Scalability Mobile applications can be scaled to meet unpredictable user demands (e.g. disaster scenario) Service providers can easily add and expand a service

18 Advantages of MCC Multi-tenancy Service providers can share the resources and costs to support a variety of applications and large # of users => cost to mobile user Ease of Integration Multiple services from different providers can be integrated easily through the cloud E.g. photo search service can leverage photo indexing service

19 Architectural Option #1 Global cloud: mobile is consumer-only

20 Architectural Option #2 Local Cloud: mobile is consumer-only

21 Architectural Option #3 Ad-hoc Cloud: consumer and contributor

22 Architectural Option #4 Hybrid of 1, 2, 3: consumer and contributor Global cloud pushes data or computation to the local cloud and ad-hoc cloud! Think: Content-distribution network (CDN)

23 MCC Challenges: the Network Energy-efficient interactions Network is a battery drain Consider payload size Solution: Cost benefit analysis But increasingly Big Data is part of the mobile landscape! Video collection and processing Solution: for delay-tolerant applications, figure out when network is more favorable

24 SALSA project at USC Data-Intensive, Delay-Tolerant Applications Video Audio. Data-Intensive Sensing Large Database. Download Delay-Tolerant Upload Context Prefetching Large Database (e.g. WPS) Maps Media Application Participatory Sensing Monitoring Personal resources Dietary Habits

25 MCC Challenges: Overheads Migration overhead If we use VMs, they are large Cost benefit analysis

26 MCC Challenges: Security/Privacy Privacy Give cloud access to my personal data? or my location? Security If mobile user is a contributor

27 MCC Challenges: Security Protecting user security/privacy is the key to establish and maintain consumers trust in the mobile platform, especially in MCC MCC security issues have two main categories: Security for mobile users Securing data on clouds

28 Security/Privacy for Mobile Users Mobile devices are exposed to numerous security threats (e.g. theft, malicious code) Security for mobile applications: Installing and running security software is the simplest way to detect security threats Mobile devices are resource constrained, protecting them from threats can be resourceintensive! Can cloud help or hinder?

29 MCC Challenges: Context-awareness Local context network status, device characteristics, external environment, user preferences Context-aware mobile cloud services should strive to utilize the local context to improve mobile user experience metrics? How to do it efficiently?

30 MCC Challenges: Offloading What is the right mechanism? What is the right granularity? What about sharing across mobile users? What about mobile cloud programming languages, run-time systems, cloud services, etc.

31 MCC Applications #1 Assistive technologies: Pedestrian crossing guide for the visually-impaired Mobile currency reader for the visually impaired Lecture transcription for hearing impaired students Augmented Reality, Perception-based

32 Interactive Mobile Perception Advent of Inference Technology Computer Vision Language Translation Natural language processing, etc. Rich Sensors and Smart Mobile Devices Perception application is very relevant for mobile devices. Smartphone technology High data rate sensors - Interactive. (low latency 10 ~ 100ms) - High data rate. (media data) - Computationally Intensive. (ML/Vision-based algorithms) M. Ra, A. Sheth, L. Mummert, P. Pillai, D. Wetherall, Odessa: Enabling Interactive Perception Applications on Mobile Devices, ACM MobiSys 2011

33 MCC Applications #2 Mobile/remote Healthcare: Comprehensive real-time health monitoring services BP, pulse, glucose, etc Body-area networks Pervasive access to healthcare information

34 MCC Applications #3 Web applications: Run javascript in the cloud Cloud-side compression Cloud-side aggregation (Silk)

35 MCC Applications #4 Other applications: Sharing photos/videos Keyword-based, voice-based, tag-based searching Monitoring a house, smart home systems Gaming E-Learning

36 Next Time: Outsourcing MAUI: Making Smartphones Last Longer with Code Offload Cuckoo: a Computation Offloading Framework for Smartphones