WIRLESS CLOUD NETWORK
- 1. WIRLESS NETWORK CLOUD /MOBILE CLOUD COMPUTING (MCC) Student Name-Aashish Pande Student ID-39920573 ABSTRACT With the growth of the mobile communication network,from third-generation to fourth- generation networks,technologies in the mobile industry continue to consider advanced wireless network architecture that have the potential to reduce networking costs and provide increased flexibility with respect to network features.In this report,we propose the Wireless Network Cloud (WNC),a wireless system architecture for a wireless access network.This system makes use of emerging cloud-computing technology and various technologies involved with wireless infrastructure.Mobile cloud applications move the computing power and data storage away from the mobile devices and into powerful and centralized computing platforms located in clouds,which are then accessed over the wireless connection based on a thin native client. SUMMARY Based on open information technology architecture,the WNC provides all the necessary and processing resources for a wireless access network operating in a cloud mode.Note that it is useful to separate the hardware and software for different wireless standards and various services and business models,as well as to meet the new system requirements for emerging wireless technologies,such as collaborative processing at different scales of network use.We analyze several imporatant system challenges involving computational requirements of virtual base stations,I/O throughput and timing networks for synchronization.Based on current information technologies,we make several suggestions with respect to future system design.We further discuss the application,issues and advantages related to Mobile Cloud Computing (MCC).
- 2. INTRODCUTION Radio Access Network (RAN) is the key infrastructure in mobile communication network.Todays wireless towers send data to mobile devices over Radio Access Network (RAN).Each RAN base station can only connect with a limited number of antennas (which is the leading reason for dropped calls between stations). Ripping,replacing,or even just updating these base stations is costly,a single station can cost upwards of $100,000.In addition,network voice call load-what the base stations were originally built to manage is low and underutilized,while the network can’t meet the growing demand for services offered through mobile devices.Furthermore,base stations typically don’t communicate well with one another because they’re proprietary,and different generations of systems must meet different regulatory standards. WNC changes this existing wireless communication infrastructure by integrating multi- core processors,high speed system interconnects,virtualization technology and cloud computing.It provides consolidated support for todays multi-standard and multi-system software radio communication on a cluster of general purpose servers.That means radio frequencies will be generated by software,rather than by todays incompatible RAN base stations. Figure below shows how the servers are interconnected in a cloud controlling the base stations for the different services using the respective softwares. Mobile devices face many resource challenges (battery life,storage,bandwidth etc).Mobile cloud computing provides mobile users with data storage and processing services in clouds,obviating the need to have a powerful device configuration (eg CPU speed,memory capacity etc),as all resource-intensive computing can be performed in the cloud. GSM RF header WiMAX RF header WCDMA RF header WCDMA RF header GSM RF header LTE RF header Resource manager Server for BS LTE WiMAX GSM WiMAX WCDMA WCDMA WCDMA GSM GSM Server for Access GW Timing Network over IP/Eth Server for Access GW
- 3. WIRELESS NETWORK CLOUD ARCHITECTURE The wireless signal-processing of the base station are handled by the Open Wireless System Cloud (OWSC) framework as well as related management functions in the core network. OWSC framework The virtual base stations (VBS) in the cloud replace the traditional base stations.
- 4. The Remore Radio Header (RRH) is used to decouple the radio header from the base station. The radio header is equipped with a transceiving device as well as digital/analog (D/A) signal and analog/digital (A/D) converters,which convert radio frequency (RF) to digital intermediate frequency signals (IF).IF signals from different base stations are backhauled to the computing center using optical fibre. A direct or one-hop connection to an optical network is provided for each radio header.There are several ongoing standards which define the transmission protocols between RRH and BS,such as Open Base Station Architecture Initiative (OBSAI) and Common Public Radio Interface (CPRI).This structure matches the evolution of the Internet. The hierarchical structure of traditional networks is being flattened by the cloud.The distance of the optical backhaul between the RRH and the cloud computing center would be determined by the size of the centralization scale.Since the cost of the fibre network is reduced significantly nowadays,the cost to provide the optical backhaul is realizable.Actually,in current wireless network deployment,the optical backhaul is also the technical trend.This infrastructure is based on high performance software defined radios (SDR) running on commercial off the shelf platforms in the cloud. SDR BaseStation Pool Antenna + Remote Radio Header Fiber (> 10Km)
- 5. In a cloud computing center,SDR provides all the expected functions of a wireless access network,such as modulation/demodulation,channel encoding/decoding,joint detection,channel measurements,medium access control (MAC),link layer control (LLC),radio link control (RLC),radio network control (RNC) etc.Almost all of these computing tasks are implemented by software on N-core general purpose processors utilizing high degree of parallelism and specially designed accelerators.Scalable computing cluster with SDR implementation makes it feasible for cooperative wireless signal processing amongst the virtual base stations. ADVANTAGES OF WIRELESS NETWORK CLOUD System upgrade becomes a software upgrade. Software upgrades for different standards makes the network flexible thus assisting the telecom operators to reduce their network construction costs and improve resource utilization. Sharing processing capabilities between virtualized base stations could further reduce interference between base stations,and improves network coverage. Deployment is much simpler. New protocols or improvement in existing protocols can be deployed very quickly and with low incremental cost. APPLICATIONS iBSP- IT based Base Station supporting Platform,the system software framework to support high throughput low latency SDR BS workload on IT platform. pFAST- PCIe based FPGA acceleration system to provide the I/O and processing acceleration with high throughput,low latency. ISSUES of WNC Cloud managed wireless solutions offload their configurationor management duties to the cloud.If the service is out,unavailable or expired you lose the ability to make configuration changes to your system until the service is restored. Performance of the network depends on the choice of platforms and servers. Mobile Cloud Computing (MCC) Popularity According to a recent study by ABI research,more than 240 million business will use cloud services through mobile devices by 2015.That traction will push the revenue of
- 6. mobile cloud computing to $5.2 billion.Mobile cloud computing is a highly promising trend for the future of mobile computing. MCC ARCHITECTURE Mobile devices are connected to the mobile networks via base stations that establish and control the connections and functional interfaces between the networks and mobile devices. Mobile users’ requests and information are transmitted to the central processors that are connected to servers providing mobile network services. The subscribers’ requests are delivered to a cloud through the Internet.In the cloud,cloud controllers process the requests to provide mobile users with the corresponding cloud services.
- 7. ADVANTAGES of MCC 1) 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). 2) Improving data storage capacity and processing power:MCC enables mobile users to store/access large data on the cloud. 3) Improving reliability and availability : Keeping data and application in the cloud reduces the chance of losing them on the mobile devices.MCC can be designed as a comprehensive data security model for both service providers and users.With data and services in the clouds,they are always (almost) available when the users are moving. 4) Dynamic Provisioning:Dynamic on-demand provisioning of resources on a fine grained,self service basis.No need for advanced reservation. 5) Scalability: Mobile applications can be performed and scaled to meet the unpredictable user demands.Service providers can easily add and expand a service. 6) Multi-tenancy:Service providers can share the resources and costs to support a variety of applications and larfe number of users. 7) Ease of integration: Multiple services from different providers can be integrated easily through the cloud and the Internet to meet user demands. MCC ISSUES 1) Mobile communication issue: Low bandwidth: One of the biggest issue,because the radio resources for wireless networks is much more scarce than wired networks. Service availability: Mobile users may not be able to connect to the cloud to obtain a service due to traffic congestion,network failures,mobile signal strength problems. Heterogeneity: Handling wireless connectivity with highly heterogenous networks to satisfy MCC requirements is a difficult problem. 2) Computing issues: computation offloading One of the main features of MCC,offloading is not always effective in saving energy. It is critical to determine whether to offload and which portions of the service codes to offload
- 8. 3) Privacy Issues: Location based services (LBS) faces a privacy issue on mobile users provide private information such as their current location. This problem becomes even worse if an adversary knows users important information. MCC APPLICATIONS 1) Mobile commerce: M-Commerce allows business models for commerce using mobile devices. 2) Mobile Learning: M-Learning combines e-learning and mobility. Enhanced communication quality between students and teachers.Creates a natural environment for collaborative learning. 3) Mobile Healthcare: M-healthcare is to minimize the limitations of traditional medical treatment (e.g Small storage,security/privacy,medical errors etc.) M-healthcare offers hospitals and healthcare organizations a variety of on- demand services on clouds. 4) Mobile Gaming: M-game is a high potential market generating revenues for service providers. M-game can completely offload game engine requiring large computing resource to the server in the cloud. 5) Other applications: Sharing photos/videos. Keyword-based,voice-based,tag-based searching. Monitoring a house,smart home systems.
- 9. CONCLUSION The cloud provides many options for the everyday computer and mobile user as well as large and small business.It opens up the world of computing to a broader range of users and increases the ease of use by giving access through any internet connection. However,with this increased ease also come drawbacks.We have less control over who chas access to your information and little to no knowledge of where it is stored.The cloud is a big target for malicious individuals and may have disadvantages because it can be accessed through an unsecured internet connection. REFERENCES 1. Wireless Network Cloud:Architecture and System Requirements. Y.Lin,L Shao,Z Zhu,Q Wang, IBM Journal of Research and Development. 2. Chetan S.,Gautam Kumar,K. Dinesh,Mathew K.and Abhimanyu M.A. ,:Cloud Computing for Mobile World”.