Abstract
Multiple-input multiple-output (MIMO) technologies have been shown to potentially improve the performance of network. Many traditional medium access control (MAC) protocols, such as spatial time division multiple access (STDMA), may not support MIMO technologies directly and not make full use of the feature of MIMO, which may be a limitation in the practical application in ad hoc networks. Therefore, in this paper, we propose a dynamic time slot allocation and stream control for MIMO STDMA (DTSMS) protocol to improve STDMA in performance. Utilizing stream control technology of MIMO and reservation scheme, DTSMS makes improvement on network throughput and avoids the mutual interference of neighbor links. Thus, DTSMS can support both unicast and multicast simultaneously. Moreover, we implement the dynamic time slot allocation scheme in DTSMS to guarantee the transmission efficiency of packets with high cross-layer transmission parameters, such as the packet priority, neighbor node density, or link quality. Utilizing the collected cross-layer information, the proposed scheme allocates time slots for all nodes dynamically according to the changes of network topology and nodes’ transmission parameters. Finally, the effectiveness of the protocol is demonstrated by numerical analysis and simulations. The results show that DTSMS outperforms STDMA in terms of network throughput and delay. Furthermore, compared to our previous TTS-MIMO, DTSMS can decrease the delay of packets with high transmission parameters and improve the quality of service (QoS).
Highlights
Ad hoc networks are an infrastructureless networks where nodes are often inexpensive off-the-shelf equipment with wireless transceivers, which could be organized anywhere at any time [1, 2]
We mainly focus on Multiple-input multiple-output (MIMO) medium access control (MAC) protocols based on time division multiple access (TDMA) in this paper
The main problem we address and the corresponding contribution of this paper is implementing a multiple access protocol in ad hoc network based on spatial time division multiple access (STDMA) supporting MIMO, which can be divided into the following aspects :
Summary
Ad hoc networks are an infrastructureless networks where nodes are often inexpensive off-the-shelf equipment with wireless transceivers, which could be organized anywhere at any time [1, 2]. Traditional TDMA MAC protocols cannot fully multiplex channels, so spatial time division multiple access (STDMA) protocol in [10] is proposed to make full use of the channel of the network. On the one hand, we can use the cross-layer information to adjust the transmission strategy adaptively to satisfy requirements of high layer, and on the other hand, we can utilize them to implement time slot allocation for all the nodes in ad hoc networks. The main problem we address and the corresponding contribution of this paper is implementing a multiple access protocol in ad hoc network based on STDMA supporting MIMO, which can be divided into the following aspects :. We implement dynamic time slot allocation scheme in DTSMS protocol to adjust the transmission time slots for all nodes according to the changes of network topologies and cross-layer information.
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