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您的检索式：作者名="Lin Shangjuan"
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| 1 | Performance analysis of LTE-U coexistence network with WiFi using queueing model显示文摘The unforeseen mobile data explosion as well as the scarce of spectrum resource pose a major challenge to the performance of today's cellular networks which are in urgent need of novel solutions to handle such voluminous mobile data. Long term evolution-unlicensed(LTE-U), which extends the LTE standard operating on the unlicensed band, has been proposed to improve system throughput. In LTE-U system, arriving users will contend the unlicensed spectrum resource with wireless fidelity(WiFi) users to transmit data information. Nevertheless, there is no clear consensus as to the benefits of transmission using unlicensed bands for LTE users. To this end, in this paper an analytical model is presented based on a queue system to understand the performance achieved by unlicensed based LTE system taking quality of services(Qo S) and LTE-U users' behaviors into account. To obtain the stead-state solutions of the queue system, a matrix geometric method is used to solve it. Then, the average delay and utilization of unlicensed band for the LTE-U users is derived by using the queuing model. The performance of LTE-U coexistence is evaluated with WiFi using the proposed model and provide some initial insights as to the advantage of LTE-U in practice. | Hu Zhiqun Lu Zhaoming Lin Shangjuan Wen Xiangming Xu Hen | 2017 | The Journal of China Universities of Posts and Telecommunications2017，24，5： | 2 |
| 2 | Improving throughput through dynamically tuning contention window size in dense wireless network显示文摘With the boom of wireless devices, the number of wireless users under wireless local area networks(WLANs) has increased dramatically. However, the standard backoff mechanism in IEEE 802.11 adopts fixed initial contention window(CW) size without considering changes of network load, which leads to a high collision probability and low channel utilization in bursty arrivals. In this paper, a novel CW dynamic adjustment scheme is proposed to achieve high throughput performance in dense user environment. In the proposed scheme, the initial CW size is dynamically adjusted to optimum according to the measured packet collision probability. Simulation results show that the proposed scheme can significantly improve the throughput performance. | Lin Shangjuan Wen Xiangming Hu Zhiqun Lu Zhaoming | 2017 | The Journal of China Universities of Posts and Telecommunications2017，24，4： | 1 |
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