Zone Based Resource Allocation for OFDMA Systems

Balachandran, K.; Calin, Doru; Kang, Joseph H.; Joshi, Niranjan; Kogiantis, Achilles

doi:10.1109/vtcf.2006.480

Cited by 4 publications

(8 citation statements)

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“…interference signals [3], bringing the model very close to reality. I I I I I I I I I I I I I I I I I I I I I I I …”

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confidence: 74%

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VoIP over realistic IEEE 802.16e system scenarios: The uplink direction

Calin¹

2012

2012 IEEE Global Communications Conference (GLOBECOM)

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As opposed to best-effort data applications, which tolerate a lot of flexibility from a system resource allocation standpoint, real-time services such as Voice over IP (VoIP) have very stringent packet delivery requirements, characterized by tight air-interface delay budgets in the order of tens of milliseconds (ms). Speech packets are short by nature and need to be carried out with minimal packet loss probability, typically no more than 1 %-2%. These constraints are even more limiting in the uplink, where the available power at the mobile terminalcouple of hundreds of milliWatts (mW) -is much lower compared to the available power at the base station in the downlink (tens of Watts (W». The paper addresses the VoIP service in the context of the limiting uplink direction of an IEEE 802.16e system via a comprehensive system simulation study.

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“…interference signals [3], bringing the model very close to reality. I I I I I I I I I I I I I I I I I I I I I I I …”

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confidence: 74%

“…The effect of the number of retransmissions on the system capacity is evaluated and discussed in the paper. Fast fading is modeled per sub-carrier for both signal and interference components[3]. Link error prediction is carried out using the Exponential Effective SINR Mapping (EESM) method[4].…”

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confidence: 99%

VoIP over realistic IEEE 802.16e system scenarios: The uplink direction

Calin¹

2012

2012 IEEE Global Communications Conference (GLOBECOM)

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“…Robust header compression (ROHC) is employed to reduce the original 40 bytes of Real Transport Protocol/User Datagram Protocol/Internet Protocol (RTP/UDP/IP) overhead to 3 bytes only. Partially Used Sub-channelization (PUSC) [1][2][3] based on distributed sub-carriers allocation to sub-channels is employed. To support the uplink traffic, control slots are allocated for ranging, channel quality indication and downlink HARQ acknowledgments, as part of the uplink subframe (the reader is referred to [3] for a detailed picture of the TDD OFDMA frame).…”

Section: Voip Design Choices Resources Allocation and Modeling Amentioning

confidence: 99%

“…Partially Used Sub-channelization (PUSC) [1][2][3] based on distributed sub-carriers allocation to sub-channels is employed. To support the uplink traffic, control slots are allocated for ranging, channel quality indication and downlink HARQ acknowledgments, as part of the uplink subframe (the reader is referred to [3] for a detailed picture of the TDD OFDMA frame). For the loads assumed in the paper, 3 OFDMA symbols were considered sufficient to carry out the uplink overhead in the context of an Extended Real Time Polling Service (eRTPS) like VoIP [1][2].…”

Section: Voip Design Choices Resources Allocation and Modeling Amentioning

confidence: 99%

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Design and analysis of a VoIP based IEEE 802.16e system

Calin¹

2013

2013 IEEE Global Communications Conference (GLOBECOM)

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Real-time packet based services such as Voice over IP (VoIP) have stringent packet delivery requirements, characterized by very low packet loss (in the order of 1% -2%) and tight air-interface delay budgets in the order of tens of milliseconds (ms). In the context of IEEE 802.16e, VoIP service raises additional challenges since the MAP overhead, and hence the required resources dedicated to the control traffic, can grow very large in the presence of multiple simultaneous connections, limiting the amount of resources that can be devoted to the effective traffic. The paper offers a detailed understanding of the specifics of the VoIP application in the IEEE 802.16e (mobile WiMAX) context, including an overview of various design choices, implementation challenges and performance analysis. VoIP capacity results are presented for a set of scenarios accounting in the downlink direction.

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