Performance evaluation of a logical link control protocol for an ATM air interface

Petras, Dietmar; Hettich, A.; Kramling, A.

doi:10.1109/pimrc.1996.568413

Cited by 14 publications

(5 citation statements)

References 3 publications

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“…In [13], the architecture also involves a traditional data link ARQ protocol applied only to traffic that is not sensitive to increased delays. Recently, an ARQ scheme has been developed to accommodate real-time service [16]. The result is achieved by scheduling the feedback (ACK and NAK) based on the relative urgency of the transmitted packets; in addition, if the due date of the packet has expired, the packet is discarded, and the receiver is notified.…”

Section: B Effects Of a Qos-sensitive Error-control Scheme On The Rementioning

confidence: 99%

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Achievable QoS in an interference/resource limited shared wireless channel

Capone

Stavrakakis

1999

IEEE J. Select. Areas Commun.

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In this work, the region of achievable quality-ofservice (QoS) is precisely described for a system of real-time heterogeneous variable bit rate (VBR) sources competing for slots (packet transmission times) of a time division multiple access (TDMA) frame. The QoS for each application is defined in terms of a maximum tolerable packet-dropping probability. Packets may be dropped due to delay violations and channel induced errors. The region of achievable QoS is precisely described for an interference/resource limited network by considering the underlying TDMA-multiple access control (TDMA-MAC) structure and the physical channel. A simple QoS-sensitive errorcontrol protocol that combats the effects of the wireless channel while satisfying the real-time requirements is proposed and its impact on the region of achievable QoS is evaluated. The results presented here clearly illustrate the negative impact of a poor channel and the positive impact of the employed error-control protocol on the achievable QoS. The region of achievable QoS vectors is central to the call admission problem, and in this work, it is used to identify a class of scheduling policies capable of delivering any achievable performance.

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Section: B Effects Of a Qos-sensitive Error-control Scheme On The Rementioning

confidence: 99%

“…is derived and it is given by (16) The expected value in (16) is with respect to which is easily computed since , . The expressions in (15) and (16) reduce to (4) and (5) respectively, for fixed and equal to one. The extreme points in this case correspond to fair-ordered HoL (F-O-HoL) priority service policies.…”

Section: ) Unbiased Error Controlmentioning

confidence: 99%

Achievable QoS in an interference/resource limited shared wireless channel

Capone

Stavrakakis

1999

IEEE J. Select. Areas Commun.

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“…In [18], the architecture also involves a traditional data link automatic repeat request (ARQ) protocol applied only to traffic that is not sensitive to increased delays. Recently, an ARQ scheme has been developed to accommodate real-time service [20]. The result is achieved by scheduling the feedback -acknowledgments (ACKs) and negative acknowledgments (NAKs) based on the relative urgency of the transmitted packets; in addition, if the due date of the packet has expired, the packet is discarded and the receiver notified.…”

Section: Effects Of the Wireless Channel And An Error Control Scheme mentioning

confidence: 99%

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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“…Down-MAC-PDUs in downlink and UP-MAC-PDUs in uplink is not successful for long time periods, the requested retransmissions will lead to an even heavier overload situation. When comparing the right-hand columns of the tables it becomes visible that applying the Selective Reject with Discarding (SWD) retransmission strategy from [7], the cell loss ratio is efficiently reduced. Thus, even for the bursty channel, ARQ protocols should be applied together with forward error correction for VBR and CBR channels in FWA Networks.…”

Section: Resultsmentioning

confidence: 99%

Optimal DLC protocol configuration for realistic broadband fixed wireless access networks based on ATM

Mangold¹,

Forkel²

1999 2nd International Conference on ATM. ICATM'99 (Cat. No.99EX284)

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Scheduling and multiplexing issues for broadband fixed wireless access networks based on ATM are discussed. The established DSA++ MAC protocol has been developed at ComNets and has been widely applied within the German ATMmobil project. It has been a fundamental contribution to the ETSI BRAN standardization of HIPERLAN/2. The DSA++ is here modified to perform optimal within the fixed wireless access network environment. Therefore, realistic traffic as well as radio channel models for the respective scenarios are introduced. Simulation results are presented, showing the feasibility of the respective protocol stack for offering broadband multimedia services with reasonable quality of service.

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Performance evaluation of a logical link control protocol for an ATM air interface

Cited by 14 publications

References 3 publications

Achievable QoS in an interference/resource limited shared wireless channel

Achievable QoS in an interference/resource limited shared wireless channel

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

Optimal DLC protocol configuration for realistic broadband fixed wireless access networks based on ATM

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