An integrated ARQ/HARQ Mechanism in the IEEE 802.16m Protocol
Date Issued
2011
Date
2011
Author(s)
Liu, Cheng-Che
Abstract
When more and more people use smart phones and tablet computers, they can connect to the Internet anytime and anywhere. However, in outdoor environments, the available bandwidth of the 3rd-generation mobile network cannot support so many users and provide good quality. Therefore, to increase transmission speed and quality, International Telecommunication Union (ITU) defines the specification for the next generation (4G) mobile communication network. IEEE 802.16m is the standard that IEEE 802.16 working group (WG) defines to meet the requirement for 4G mobile communication networks.
To increase transmission capacity, a base station (BS) and its users can use multi-carrier for control messages and data transmission in the current release of the IEEE 802.16m standard draft. The MAC protocol which uses multi-carrier transmission is different from the MAC protocol using a single carrier transmission. When using multi-carrier transmission, the MAC protocol must consider the quality for each carrier, available timing, and data allocation problem. In addition, using multi-carrier transmission may increase the feedback overhead. Therefore, we hope that we can control the feedback overhead effectively to avoid wasting the radio resource.
In this thesis, we first focus on Automatic Repeat reQuest (ARQ) and Hybrid Automatic Repeat reQuest (HARQ) and design an optimized retransmission policy. The optimized retransmission policy not only lowers the complexity of a receiver but also improves the retransmission efficiency and system performance. Second, when the MAC protocol uses multi-carrier transmission, we allocate the data to different carriers according to their link characteristics. That can further improve the transmission efficiency and then increase the system throughput. Finally, we conduct in-depth simulation to show that our method outperforms the existing IEEE 802.16m specification.
Subjects
Automatic Repeat-reQuest (ARQ)
Hybrid AutomaticRepeat-reQuest (HARQ)
retransmission policy
multi-carrier transmission
medium access control
Type
thesis
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