Stable Throughput Region and Admission Control for Device-to-Device Cellular Coexisting Networks
Stable Throughput Region and Admission Control for Device-to-Device Cellular Coexisting Networks
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DOI：
10.1109/twc.2015.2511004
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发表时间：
2016-04
影响因子：
10.4
通讯作者：
Hao Lu;Yichen Wang;Yan Chen;K. Liu
中科院分区：
文献类型：
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作者：
Hao Lu;Yichen Wang;Yan Chen;K. Liu
设备到设备（D2D）通信被认为是增强蜂窝网络系统容量的重要技术，这需要有效的干扰建模和管理来提高频谱效率。实际上，即使两个无线连接共享相同的资源，如果分组级传输不存在冲突，它们之间的干扰也可能并不总是存在。为了探索干扰的真实影响，在本文中，我们建立了蜂窝网络下 D2D 通信的跨层模型，并推导了封闭形式的稳定吞吐量区域。然后，我们制定一个优化问题以获得蜂窝链路的最大可实现分组速率，这决定了D2D对是否可以与特定蜂窝链路共享相同的资源。通过将原始优化问题分解为多个简化的子问题，可以以较低的复杂度计算最优解。随后，我们的模型扩展到一种通用场景，其中多个 D2D 对与一个蜂窝链路共享相同的资源。由于获得稳定吞吐量区域上的封闭式表达式的复杂性，我们提出了一种算法来确定蜂窝链路和多个D2D对的传输是否能够同时满足QoS要求。此外，引入了低复杂度的动态准入控制策略来处理新的D2D请求的准入过程。因此，蜂窝频谱可以允许比传统模型访问更多的 D2D 对。数值模拟验证了显着的改进。
Device-to-device (D2D) communication is proposed as a vital technique to enhance system capacity in cellular networks, which requires efficient interference modeling and managements to improve spectral efficiency. In practice, even when two wireless connections share the same resources, the interference between them may not always exist if there is no conflict at packet-level transmissions. To explore the real effect of interference, in this paper, we establish a cross-layer model for D2D communications underlaying cellular network and derive the closed-form stable throughput region. Then, we formulate an optimization problem to obtain the maximal achievable packet rate for cellular link, which determines whether the D2D pair can share the same resources with a specific cellular link. By dividing the original optimization problem into several simplified subproblems, the optimal solution can be calculated with low complexity. Subsequently, our model is extended to a generalized scenario where multiple D2D pairs share the same resources with one cellular link. Due to the complexity of obtaining closed-form expressions on stable throughput regions, we propose an algorithm to determine whether the transmissions of the cellular link and the multiple D2D pairs can satisfy the QoS requirements simultaneously. Furthermore, a low-complexity dynamic admission control strategy is introduced to deal with the admission process for new D2D requests. As a consequence, the cellular spectrum can allow access of many more D2D pairs than what the conventional model can. The significant improvements are verified by numeral simulations.