LTE/WiFi聚合异构空中接口的优化调度
Optimal Scheduling across Heterogeneous Air Interfaces of LTE/WiFi Aggregation
摘要：
LTE/WiFi聚合（LWA）提供了一种通过利用未授权频带来缓解授权频带中的数据业务拥塞的有前景的方法。关键的挑战来自于通过授权和未授权频带的异构接口提供服务质量（QoS）。在本文中，我们最大限度地减少所需的授权频谱，而不降低QoS中存在的多个用户。具体而言，LWA的聚合有效容量首先推导出一个新的半马尔可夫模型。以最小化授权带宽为目标，建立了授权频段和非授权频段之间具有QoS保证的多频段资源分配模型，利用块坐标下降法（BCD）和两个凸函数差分法（DC）对模型进行了凸化，并采用一种新的迭代算法进行了有效求解。仿真结果表明，显着的性能增益的启发式替代方法。
英文摘要：
LTE/WiFi Aggregation (LWA) provides a promising approach to relieve data traffic congestion in licensed bands by leveraging unlicensed bands. Critical challenges arise from provisioning quality-of-service (QoS) through heterogenous interfaces of licensed and unlicensed bands. In this paper, we minimize the required licensed spectrum without degrading the QoS in the presence of multiple users. Specifically, the aggregated effective capacity of LWA is firstly derived by developing a new semi-Markov model. Multi-band resource allocation with the QoS guarantee between the licensed and unlicensed bands is formulated to minimize the licensed bandwidth, convexified by exploiting Block Coordinate Descent (BCD) and difference of two convex functions (DC) programming, and solved efficiently with a new iterative algorithm. Simulation results demonstrate significant performance gain of the proposed approach over heuristic alternatives.
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