Power splitting (PS) based simultaneous wireless information and power transfer (SWIPT) is considered in a multi-user multiple-input-single-output broadcast scenario. Specifically, we focus on jointly configuring the transmit beamforming vectors and receive PS ratios to minimize the total transmit energy of the base station under the user-specific latency and energy harvesting (EH) requirements. The battery depletion phenomenon is avoided by preemptively incorporating information regarding the receivers' battery state and EH fluctuations into the resource allocation design. The resulting time-average sum-power minimization problem is temporally correlated, non-convex (including mutually coupled latency-battery queue dynamics), and in general intractable. We use the Lyapunov optimization framework and derive a dynamic control algorithm to transform the original problem into a sequence of deterministic and independent subproblems, which are then solved via two alternative approaches: i) semidefinite relaxation combined with fractional programming, and ii) successive convex approximation. Furthermore, we design a low-complexity closed-form iterative algorithm exploiting the Karush-Kuhn-Tucker optimality conditions for a specific scenario with delay bounded batteryless receivers. Numerical results provide insights on the robustness of the proposed design to realize an energy-efficient SWIPT system while ensuring latency and EH requirements in a time dynamic mobile access network.
翻译:在多用户多投多投单输出广播情景中,考虑了基于同时的无线信息与电源传输(SWIPT)的断电(PS)基站基于同时的无线信息与电源传输(SWIPT)。具体地说,我们侧重于联合配置传输光成矢量,并获得PS比率,以最大限度地减少在用户特定的延缓和节能要求下基站的传输能量总量。通过先发制人地将接收器电池状态和EH波动方面的信息纳入资源分配设计,可以避免电池耗竭现象。由此产生的时间平均总能量最小化问题是时间性相关、非凝聚(包括相互结合的悬浮电池排队列动态)和一般难以解决的问题。我们使用Lyapunov优化框架并获得动态控制算法,将原始问题转化为一系列的确定性和独立的子问题,然后通过两种替代方法加以解决:i)半定宽度宽松与微编程组合结合,以及连续的连接点近点。此外,我们设计了一个低兼容性封闭式的迭流动定调调调调调调调调调(包括相互配合的延展的延展式定调调调调调调调调调调调调调调调调调调调调调调调调调调调调制的调制的调和调和调和调和调和调和调和调和调和调制调和调和调制调制调制调制调调调调调调调调调调调调调调调调调制调制调制调制调制调制,同时利用卡鲁普调和调制调制调制调制调制调制调制调制调制的调制的调制的调制调制调制的调制的调制的调制的调制的调制的调制调制调制调制调制调制的调制的调制的调制,同时调制的调制,同时调制的调制的调和调制调制调和调制调制调制调制的调制,同时调制调制调制调制的调制的调制调制调制),同时调制的调制的调制调制调制调制调制调制的调制的调制的调制的调制的调制调制