HSPA+异构网中信道分离技术的时延补偿研究

[摘要] 认为异构网的引入有效提高了高速分组接入+（HSPA+）网络的整体性能，但由于构成异构网的宏基站（MNB）和低功率节点（LPN）发射功率不同，造成上下行数据传输的不均衡，这将不可避免地影响到异构网络的整体性能；增强专用信道（E-DCH）分离技术能够有效消除上下行不均衡问题带来的影响，但信道分离技术在实际应用中会有严重的时延问题。基于上述观点，讨论了HSPA+异构网共信道传输中的控制信道时延问题，并针对这个问题提出自适应灰色预测算法（AGP）实现时延补偿。系统仿真验证了算法的正确性和有效性。

[关键词] 适应性灰色预测算法；E-DCH分离；控制信道时延；HSPA+异构网

[Abstract] Heterogeneous networking (HetNet) has been introduced to HSPA+ to enhance the system performance in a cost-efficient way. The uplink-downlink (UL-DL) mismatch caused by heterogeneous deployment reduces performance in the HSPA+ system. To mitigate this mismatch, enhanced dedicated channel (E-DCH) decoupling has been proposed. However, control channels for UL cause undesirable reception delay. In this paper, we focus on delay in co-channel HSPA+ HetNet and propose adaptive grey prediction (AGP) for delay compensation. System-level simulations show that our proposed method has some significant advantages.

[Keywords] AGP; E-DCH; control channel delay; HSPA + heterogeneous network