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For dense ad hoc networks, clustering is an appropriate strategy to efficiently organize the network. Moreover, public safety or military networks are structured through a hierarchical organization via operational groups. This organization has an impact on both the mobility of nodes which move in groups, and the data flow since the traffic is mainly intra-group. In this work we propose a novel distributed...
For dense ad hoc networks, clustering is an appropriate strategy for improving scalability. Moreover, dense networks such as public safety or military networks are also structured through a hierarchical organization via operational groups. This organization usually impacts both the mobility of nodes which move in group, and the data flow since the traffic is mainly intra-group rather than inter-group...
Many wireless public safety and military networks are ad hoc networks, for which clustering is a well-known strategy to improve scalability. In addition these networks are structured according to a hierarchical organization, i.e. nodes belong to specific operational groups which implies that the traffic is mainly intra-group. So far, clustering algorithms are built using metrics such as node identifiers,...
The paper addresses multiuser power and bandwidth allocation in an OFDMA system using HARQ for a Rayleigh channel. New algorithms for minimizing the total transmit power under individual rate and delay constraints are proposed.
Some recent cross-layer HARQ schemes have been designed in order to enhance the system performance at network level. However, these schemes can present high performance losses as soon as the feedback is imperfect. Therefore, the purpose of this paper is to develop a new cross-layer HARQ scheme that is more robust to imperfect feedback, and that still has a cross-layer gain. Numerical simulations reveal...
We aim to study a specific cross-layer optimized Hybrid Automatic Retransmission reQuest (HARQ) introduced in [1] and called early-drop HARQ. We remind that in [1], instead of giving a transmission credit per MAC packet (as usually done), it is proposed to share the transmission credit among all the MAC packets belonging to the same IP packet. The early-drop version stops the retransmission as soon...
Hybrid ARQ with Incremental Redundancy (IR-HARQ) is one of the most popular coding technique for having a reliable transmission link. The efficiency which is the ratio between the number of correctly received bits and the number of transmitted bits is a crucial metric for analyzing the performance of an HARQ scheme. In the literature, closed-form expressions for the efficiency of the IR-HARQ scheme...
Flexbility and deployment simplicity are among the numerous advantages of wireless links when compared to standard wired communications. However, challenges do remain high for wireless communications, in particular due to the wireless medium inherent unreliability, and to the desired flexibility, which entails complex protocol procedures. In that context simulation is an important tool to understand...
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