A Downlink Performance Analysis of VoIP Services Over an IEEE 802.16e OFDMA System

So, Jaewoo

doi:10.1109/lcomm.2007.061565

Cited by 17 publications

(14 citation statements)

References 4 publications

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“…Assume that the MCS levels are represented from 1 to M in an ascending order of the spectral efficiency and ρ m is the spectral efficiency corresponding to MCS level m, and that each user sends a single data burst at each frame. Consider a compressed format which uses onedimensional allocation of the UL-MAP message excluding the MAC header because the overhead for this type of message is less than that for a normal type of message [1], [3]. The broadcast MAP comprises the DL-and UL-MAP messages.…”

Section: Map Overheadmentioning

confidence: 99%

“…Since the MAP information needs to reliably be delivered to users even near the cell boundary, it is usually encoded by quadrature phase-shift keying (QPSK) modulation at a code rate of 1/2 with six repetitions (i.e., an effective code rate of 1/12), corresponding to the lowest spectral efficiency of IEEE 802.16e [1], [2]. As a consequence, the signaling overhead for the MAP message is not negligible [3]. In particular, in services of data packets with small sizes such as voice-over-internet protocol (VoIP) traffic, the amount of MAP signaling overhead can unacceptably be large [2].…”

Section: Introductionmentioning

confidence: 99%

“…It is desirable to optimally choose the modulation coding scheme (MCS) level to minimize the signaling overhead for the sub-MAPs. However, most of previous results have been concentrated on the use of broadcast MAP messages, not on the use of sub-MAP messages [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

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Efficient Transmission of Multicast MAPs in IEEE 802.16e

Yeom

Lee

2008

IEICE Transactions on Communications

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SUMMARYThe institute of electrical and electronics engineers (IEEE) 802.16e is designed to support a wide range of applications with various quality of service requirements. Since MAP signaling overhead can unacceptably be large for voice traffic, IEEE 802.16e suggests the use of multicast sub-MAPs whose messages are encoded according to the channel condition. In this case, it is desirable for the base station to properly choose a modulation and coding set associated with the channel condition. In this letter, we consider the use of an adaptive modulation coding scheme for the multicast sub-MAPs without explicit information on the channel condition. The proposed scheme can achieve the same MAP coverage as the broadcast MAP while minimizing the signaling overhead. Simulation results show that when it is applied to voice-over-internet protocol (VoIP) services, the proposed scheme can significantly enhance the VoIP capacity.

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Section: Map Overheadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient Transmission of Multicast MAPs in IEEE 802.16e

Yeom

Lee

2008

IEICE Transactions on Communications

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“…This simplified model has been proved to provide very good approximation in analyzing packet voice traffic performance in the downlink transmissions of an IEEE 802.16 network [9] .…”

Section: Analytical Modelmentioning

confidence: 99%

Uplink Scheduling for Supporting Real Time Voice Traffic in IEEE 802.16 Backhaul Networks

Dai¹,

Zhao

2008

J. Comput. Sci. Technol.

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In this paper we propose simple enhancements to the bandwidth (BW) request messages in IEEE 802.16 for supporting real-time packet voice traffic. Three different BW request formats are proposed, each requiring a different amount of latency information about the buffered packets at the SS. On this basis, packet scheduling schemes are proposed for the BS to make resource allocations for real-time traffic. Our results show that the proposed BW request and scheduling schemes achieve significantly lower packet loss probability than the standard IEEE 802.16 BW request with round robin scheduling. The results further show that there is an optimum point about how much delay information the SS should report to the BS in order to best utilize the uplink resources while the SS provides satisfactory real-time performance for the voice traffic.

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“…Therefore, the complete partitioning scheme of the paper seems to be a fixed network, but in actual sense, the traffic model serves the WiMAX traffic of the subscriber station. A similar concept (i.e., a combination of the connection level and queue level matrix) is available for group of users in [11][12][13]. However, this paper enhances the work with the flow control of traffic.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of the WiMAX Network under a Complete Partitioned User Group with a Traffic Shaping Algorithm

Akhter¹,

Islam²,

Amin³

2014

Journal of Information Processing Systems

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Abstract-To enhance the utilization of the traffic channels of a network (instead of allocating radio channel to an individual user), a channel or a group of channels are allocated to a user group. The idea behind this is the statistical distribution of traffic arrival rates and the service time for an individual user or a group of users. In this paper, we derive the blocking probability and throughput of a subscriber station of Worldwide Interoperability for Microwave Access (WiMAX) by considering both the connection level and packet-level traffic under a complete partition scheme. The main contribution of the paper is to incorporate the traffic shaping scheme onto the incoming turbulent traffic. Hence, we have also analyzed the impact of the drain rate of the buffer on the blocking probability and throughput.

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A Downlink Performance Analysis of VoIP Services Over an IEEE 802.16e OFDMA System

Cited by 17 publications

References 4 publications

Efficient Transmission of Multicast MAPs in IEEE 802.16e

Efficient Transmission of Multicast MAPs in IEEE 802.16e

Uplink Scheduling for Supporting Real Time Voice Traffic in IEEE 802.16 Backhaul Networks

Performance Evaluation of the WiMAX Network under a Complete Partitioned User Group with a Traffic Shaping Algorithm

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