Conference Paper

Optimizing the WiMedia Frame Structure for Home Networking Applications

Comput. Sci. & Eng., Univ. at Buffalo, Buffalo, NY, USA
DOI: 10.1109/GLOCOM.2010.5684019 Conference: Global Telecommunications Conference (GLOBECOM 2010), 2010 IEEE
Source: IEEE Xplore

ABSTRACT We focus on a new class of home networking applications that enable wireless communication between multimedia devices using the WiMedia MAC protocol. Applications like streaming video from DVD players to HDTVs, generate high data rates and can easily saturate the bandwidth even at the rates provided by UWB transmissions. Thus we need to enhance the MAC layer to improve bandwidth utilization and efficiently handle the requirements of such applications. In this paper, we propose a new TDMA frame structure for the WiMedia MAC protocol that uses the specific characteristics of the traffic to minimize MAC and PHY overhead while providing delay bounds within the tolerable limits of the applications. Our results show that the proposed frame structure can provide up to 10% increase in bandwidth utilization over the WiMedia frame structure and achieve a throughput gain of about 48Mbps at the highest data rate of the MB-OFDM physical layer.

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In a mobile computing environment, a user carrying a portable computer can execute a mobile transaction by submitting the operations of the transaction to distributed data servers from different locations. As a result of this mobility, the operations of the transaction may be executed at different servers. The distribution of operations implies that the transmission of messages (such as those involved in a two phase commit protocol) may be required among these data servers in order to coordinate the execution of these operations. In this paper, we will address the distribution of operations that update partitioned data in mobile environments. We show that, for operations pertaining to resource allocation, the message overhead (e.g., for a 2PC protocol) introduced by the distribution of operations is undesirable and unnecessary. We introduce a new algorithm, the Reservation Algorithm (RA), that does not necessitate the incurring of message overheads for the commitment of mobile transac...
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Streaming video over wireless networks can be complicated by a highly varying link capacity. We present an approach that allows close-to-optimal utilization of the link bandwidth. We use a property of the medium access control (MAC) of the 802.11 standard to do instant detection of the bandwidth fluctuations by observing the transmission rate from the sending buffer. The specifics of a general MPEG stream allow classifying video-frames by their importance for the user-perceived quality. We build a scheduling mechanism that favors transmission of more important frames at the expense of the less important ones. We validate our approach by means of test-bed experiments and demonstrate a significant improvement of the end video quality.
    World of Wireless Mobile and Multimedia Networks, 2005. WoWMoM 2005. Sixth IEEE International Symposium on a; 07/2005
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This article addresses basic issues regarding the design and development of wireless access and wireless LAN systems that will operate in the 60 GHz band as part of the fourth-generation (4G) system. The 60 GHz band is of much interest since this is the band in which a massive amount of spectral space (5 GHz) has been allocated worldwide for dense wireless local communications. The article gives an overview of 60 GHz channel characteristics and puts them in their true perspective. In addition, we discuss how to achieve the exploitation of the abundant bandwidth resource for all kinds of short-range communications. The main tenor is that an overall system architecture should be worked out that provides industry with plenty of scope for product differentiation. This architecture should feature affordability, scalability, modularity, extendibility, and interoperability. In addition, user convenience and easy and efficient network deployment are important prerequisites for market success. This article discusses these features and indicates a number of key research topics
    IEEE Communications Magazine 02/2002; · 3.66 Impact Factor


1 Download
Available from