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  • Level: GCSE
  • Subject: ICT
  • Word count: 3723

Computer Networks and Distributed Systems - Wireless network of devices: General packet radio services (GPRS).

Extracts from this document...

Introduction

ASIA-PACIFIC INSTITUTE OF INFORMATION TECHNOLOGY Computer Networks and Distributed Systems (Research Paper) WIRELESS NETWORK OF DEVICES: GENERAL PACKET RADIO SERVICES (GPRS) BY: SELENA TAN EE LIN DH007153_HF0281B 1. Introduction The topic which I have chosen for my research paper is the Wireless Network of Devices. Technology has advanced in the recent years and has made humans work and communication much simpler and more importantly is a necessity in today's technology age. One of which the technology I am about to touch is networking. Networking has made our lives simpler, much more convenient and thus efficient what more, wireless networking. Wireless networking is one of several ways to connect the computers in your home. It creates a network by sending radio-frequency signals between your computers to share information. This can make networking extremely easy, especially if you have computers all over your house. It also makes it a whole lot simpler to move computers around. For example, a laptop with a wireless network card is completely portable throughout the house! Devices which uses radio frequency transmissions to replace medium-distance wired connections (such as Ethernet cables), to create what is sometimes called a WAN (wireless area network), or employed simply to replace short-distance cabling between digital devices. The most common current wireless network protocols are in the 802.11x family, sometimes referred to as Wi-Fi (Wireless Fidelity), and have a range of hundreds of feet. The shorter-range which is Bluetooth specification is intended for communications over tens of feet. These are all the wireless technology while the topic which I am going to touch is the General Packet Radio Service, also known as GPRS which is the networking and, the device for the technology is for example hand phone, Palmtop ...etc. The topic which I am going to specify on is the General Packet Radio Service (GPRS). GPRS is a wireless communication platform. In this research paper, I would also generally explain the uses of GPRS, GPRS terminals, the benefits of it and limitations. ...read more.

Middle

is far from clear. There are several routes that may be taken as shown in the following diagram. Diagram 1. GSM migration paths. The GPRS services reflects the GSM services with an exception that GPRS will have a tremendous transmission rate which will make a good impact in the most of the existing services and a possibility of introduction of new services as operators and users (business/private) appreciate the newly introduced technology. Services such as the Internet, videoconferencing and on-line shopping will be as smooth as talking on the phone; moreover we'll be able to access these services whether we are at work, at home or travelling. In this new information age, the mobile phone will deliver much than just voice calls. It will become a multi-media communications device, capable of sending and receiving graphic images and video. 5. GPRS Architecture From a high level, GPRS can be thought of as an overlay network onto a second-generation GSM network. This data overlay network provides packet data transport at rates from 9.6 to 171 kbps. Additionally, multiple users can share the same air-interface resources. GPRS attempts to reuse the existing GSM network elements as much as possible, but in order to effectively build a packet-based mobile cellular network, some new network elements, interfaces, and protocols that handle packet traffic are required. Therefore, GPRS requires modifications to numerous network elements, as summarized in Table 1 and illustrated in Diagram 2. GSM Network Element Modification or Upgrade Required for GPRS Subscriber Terminal (TE) A totally new subscriber terminal is required to access GPRS services. These new terminals will be backward compatible with GSM for voice calls. BTS A software upgrade is required in the existing base transceiver site (BTS). BSC The base station controller (BSC) will also require a software upgrade, as well as the installation of a new piece of hardware called a packet control unit (PCU). ...read more.

Conclusion

Download speeds will not be the main issue, at least in the early days. At the moment, you can download at about 12Kbit/s per GPRS channel, or timeslot (the maximum number of channels is eight, including downloads and uploads). The first available GPRS phone, Motorola's Timeport 260(shown on page 5) , had three channels for downloading data and one for sending data back to the server, giving a maximum download speed of 36Kbit/s. Newer GPRS handsets have four down channels, and can reach speeds of 48Kbit/s. With improved compression technologies in future, data rates per channel could go considerably higher. (2, 3) There is much debate today in the marketplace on the potential use of WLAN technology, especially in relation to other wireless access technologies such as GPRS and 3G. WLAN is clearly a complement to these access technologies, and together it provides greater flexibility, choice and convenience for end users. From an operator's point of view, WLAN provides additional sources of revenue and a mechanism for promoting overall growth and uptake of wireless data access for the mobile Internet. Ericsson is leading the way in standardizing and developing WLAN solutions for GPRS and 3G networks. Today the company provides solutions for operators that integrate WLAN as part of their current GPRS and 3G services. This enables operators to provide seamless mobile Internet access service for their customers. The market for packet-based cellular services is largely untested and uncertain. Major questions in the introduction of the packet networks are the level of customer acceptance and the degree of integration of service components for cellular data services. To succeed, cellular packet data will need to deliver more effective solutions than existing substitutes, or new applications where no effective substitute exists. GPRS will provide a massive boost to mobile data usage and usefulness. That much seems assured from its flexible feature set, its latency and efficiency and speed. The only question is how soon it takes off in earnest and how to ensure that the technical and commercial features do not hinder its widespread use of technology. ...read more.

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