Achievable QoS in an interference/resource limited shared wireless channel

Capone, J.M.; Stavrakakis, Ioannis

doi:10.1109/49.806832

Cited by 8 publications

References 20 publications

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Determining the call admission region for real-time heterogeneous applications in wireless TDMA networks

Capone

Stavrakakis²

1998

IEEE Network

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The call admission problem for a wireless packet-switched network supporting homogeneous applications -such as a cellular voice network -i s an old one and has been extensively investigated in the past. The focus of the present article is to investigate the call admission region for a TDMA (wireless) system supporting heterogeneous real-time VBR applications with distinct QoS re uirements and traffic and dropping probability; packets may be dropped due to delay violations or channel-induced errors. The call acceptance region is investigated in this article under the assumption that each user's per-frame resource (slot) requests are communicated to the scheduler (resource allocation authority). The call acceptance region is shaped by the QoS that can be delivered by the uplink scheduling policy. In the beginning of this article, some mechanisms employed to inform the scheduler of the users' requests along with some schedulin policies are discussed. While these reveal the entire region. In this article, an approach is outlined on how to precisely determine the call admission region (largest set of QoS points delivered under any scheduling policy) for a TDMA system. This approach is shown to lead to the precise description of the reduced call admission region in the presence of channel errors. In order to demonstrate the performance improvement provided by an error control scheme, a simple QoS-sensitive forward error control protocol operating over an erroneous channel is employed, leading to an enlargement of the calculated call admission region. Finally, it is shown that feasible scheduling policies exist which do deliver at least the minimum QoS requirement of the applications whose associated QoS vector falls within the determined call admission region.characteristics. The QoS is defined in terms of a maximum to 7 erable packet delay scheduling policies identify QoS points in t a e call admission region, they cannot n a wireless network many users communicate over a shared unreliable channel. Several network architectures have been designed to facilitate this communication, but typically only cater to one traffic type. These architectures include a medium access control (MAC) protocol to coordinate the sharing of the channel and possibly an error control scheme to combat the unreliability of the wireless link. Two popular time sharing approaches are carrier sense multiple access (CSMA) and time-division multiple access (TDMA). In CSMA, the user senses the channel and, if it is idle, transmits a packet (information unit) without any coordination with the other users. Collisions are possible, in which case retransmissions are scheduled after a random

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Determining the call admission region for real-time heterogeneous applications in wireless TDMA networks

Capone

Stavrakakis²

1998

IEEE Network

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A New Method on Effective Protocol Design for Multi-Hop Wireless Network

Zhang

2009

2009 International Symposium on Computer Network and Multimedia Technology

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Adaptive QoS for wireless multimedia networks using power control and smart antennas

Mercado

Liu

2002

IEEE Trans. Veh. Technol.

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Abstract-This paper addresses the problem of adaptive quality-of-service (QoS) for mobile multimedia services under a power controlled wireless network using smart antennas. Given the nature of multimedia, we chose the signal-to-interference and noise ratio (SINR) of each user's channel as the QoS index. We direct our attention toward two problems. The first is to increase the SINR levels for multimedia users as much as the system can provide for, under the channel fading and interference conditions. Different users have distinct desired SINR levels according to their requested service types; our algorithm uses an iterative method to drive the SINR levels as close as possible to those desired levels. The SINR levels are improved without deteriorating quality for other types of users. Simulations presented here show a significant increase in the average SINR levels for multimedia users. The second problem considered in this paper, is how to speedily initiate new users into the network by using lower complexity algorithms that yield reliable results. As shown in the simulations, our fast activation scheme can substantially reduce the time for activating new users into the system.

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Achievable QoS in an interference/resource limited shared wireless channel

Cited by 8 publications

References 20 publications

Determining the call admission region for real-time heterogeneous applications in wireless TDMA networks

Determining the call admission region for real-time heterogeneous applications in wireless TDMA networks

A New Method on Effective Protocol Design for Multi-Hop Wireless Network

Adaptive QoS for wireless multimedia networks using power control and smart antennas

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