WIRELESS MULTIPLE ACCESS PROTOCOLS IN MOBILE COMPUTING

Multiple Access Protocols for Mobile Communications - GPRS, UMTS and Beyond

Efficient Medium Access Control Protocols for Broadband Wireless Communications 369
6.6 Uniform (UNI)
All four previous algorithms have one feature in common: users consider reservation on each contention slot in sequence. This is a common method adopted [r]

In the ‘wired world’, we are witnessing how traffic of all types is increasingly being carried on packet-switched networks using the connectionless internet protocol (IP) — or rather, the IP protocol suite, which features various other protocols on top of IP, e.g. transport protocol[r]

Xem Thêm " MULTIPLE MODAL FEATURES AND MULTIPLE KERNEL LEARNING FOR HUMAN DAILY ACTIVITY RECOGNITION "

Xem Thêm " SECURE ACCESS POLICY SCHEMA USING MULTIPLE CLOUD AUTHORITIES "

The article “ Towards a Collision-Free WLAN: Dynamic Parameter Adjustment in CSMA/E2CA ” by Jaume Barcelo, Boris Bellalta, Cristina Cano, Anna Sfairopoulou, Miquel Oliver, and Kshitiz Verma enhances previous studies of these authors and investigates further the effi[r]

Phần đầu của khoá luận là tổng quan vềcông nghệdi động, các khái niệm cơ bản trong lĩnh vực điện toán di động số(mobile computing) và nghiên cứu sơqua một số công nghệ di động phổ biến nhưGSM, CDMA,WireLess...

A non-orthogonal multiple access (NOMA) is adopted in the power domain for improved spectral efficiency and network throughput of the wireless downlink in the HCRAN. We first develop a p[r]

areas in which a great research effort is being made (see Chapter 9). The new framework of mobile computing can profit from some new proposals on those topics. However, specific problems related to this new framework must be taken into consideration. Some problems are intrinsi[r]

Lecture Computer networks 1 - Lecture 3: Networking technologies has contents: Channel allocation problem, multiple access protocols, ethernet LAN, wthernet LAN.... and other contents.

Lecture Computer networks 1 - Lecture 3: Networking technologies has contents: Channel allocation problem, multiple access protocols, ethernet LAN, wthernet LAN.... and other contents.

packet duration in seconds. The traffic occupancy or throughput R is given by .
 R is the normalized channel traffic (measured in Erlangs) and if R > 1, then the packets generated by the users exceed the maximum transmission rate of the channel. For reasonable throug[r]

Chow Yuk received his Master of Philosophy in computer science from the Uni- versity of Hong Kong in 2002. He developed the lightweight mobile code system (LMCS) for the Sparkle project. Contact him at ychow@cs.hku.hk. t
Liang-Jie Zhang g is a research staff member and the f[r]

FEATURES AND BENEFITS: Flexible Architecture • Supports multiple frequency bands and wireless protocols in one enclosure – Scalable and modular – Multiple non-contiguous segments of 1.5 [r]

3.2 Low-Energy Adaptive Clustering Hierarchy (LEACH)
Low-Energy Adaptive Clustering Hierarchy or LEACH (Heinzelman et al., 2002) is a Time Division Multiple Access (TDMA-based) MAC protocol with clustering features. A network is formed as a star topology in two hiera[r]

Simplicity
The i-mode service was launched in February 1999, and by mid-2002, the number of subscribers exceeded 30 million. Over 800 companies provide information services through i- mode. In addition, there are over 38,000 i-mode Web sites that offer content to m[r]

The Access Point built into the Router uses the very latest wireless networking technology: Wireless-N (draft 802.11n). By overlaying the signals of multiple radios, Wireless-N’s “Multiple In, Multiple Out” (MIMO) technology multiplies the e[r]

4.1. Simulation Results
For simulation purposes, networks of 100 nodes are consid- ered. The simulator is a program written in C that creates topologies which have the same number of neighbor nodes (however, not necessarily a grid). The events of transmission attempts are closely related to[r]

When both users are allowed to transmit at the same time and joint decoding is performed at the base station, we get a tighter inner bound on the outage capacity region. Figure 5
shows the joint decoding inner bounds for the 10% and 1% outage capacity regions with 2, 4, 8, and 16 antenna ele- ment[r]

18.3 WHAT IS THE LIKELY IMPACT OF THE CONVERGENCE OF COMPUTING AND COMMUNICATIONS?
Part of this change involves the convergence of computers and communications. Once miniaturization began in earnest after the invention of the microprocessor on a chip in the early 1970s, co[r]

We consider a one-dimensional problem for simplicity, which can be extended to a two-dimensional setup. Taking both performance and implementation complexity into con- sideration, besides the optimal centralized scheduler, we pro- pose three decentralized MAC protocols. We first propose a dec[r]

TRANG 1 CHAPTER TEN MULTIPLE-ACCESS TECHNIQUES 10.1 INTRODUCTION Three commonly used techniques for accommodating multiple users in wireless communications are frequency division multipl[r]