微小站在4G室内覆盖中的应用策略

为了更好地改善用户室内网络体验,故分析了微小站在4G室内深度覆盖中的应用策略,文章介绍了微小站的定义和分类,研究了各类型微小站在4G室内覆盖中的适用场景和具体建设方式,并根据工程实际建设中的两个具体应用案例,对微小站建设前后测试区域的RSRP和上下行速率进行了对比分析,测试结果证明,微小站在室内深度覆盖中的应用切实可行。

一种基于IP的超微蜂窝系统传输控制协议

提出一种基于IP的超微蜂窝系统中BSSMAP(BSS Mobile Application Part)信令和话音的传输控制协议———BSTP(BSSMAP Simplified Transport Protocol).采用基于BSTP的传输系统,可以实现在无路由、交换式IP网络上简便、高效地传输话音业务.相对于传统SS7系统的SC-CP(Signaling Connection Control Part)和IP电话系统的RTP(Real-time Transport Protocol),BSTP协议更易于实现,并可在保证性能的前提下极大地降低系统成本.仿真分析和实际系统的话音业务试验结果均表明,BSTP协议及其传输架构是有效可行的.

m序列扩频CDMA系统与混沌扩频CDMA系统在Rayleigh选择性衰落信道下的性能比较

对Logistic映射的混沌序列作为扩频序列构成的混沌扩频CDMA系统与传统的m序列扩频CDMA系统进行了对比研究 ,并且对其二者在Rayleigh选择性衰落信道下的性能在SPW上进行了仿真、分析 ,具有重要实际意义 .

混沌扩频CDMA系统在Rappaport室内信道下的性能分析

采用Logistic映射的混沌序列取代目前窄带CDMA系统中的m序列，构成一个混沌扩频CDMA系统，并且对其在Rappaport室内信道下的性能在SRF上进行了仿真、分析．

Dynamic spectrum allocation for cell range extension in tiered Macro-Pico heterogeneous networks

Heterogeneous networks are employed in the next generation communication systems to enhance the area spectral efficiency （ASE）, where cell range extension （CRE） is a promising technique to improve the cell edge performance and utilize the low power node （LPN） resources more effectively. In this paper we propose a dynamic spectrum aUocation scheme for Macro-Pico scenario to mitigate both the co-tier and cross-tier interferences. The available system spectrum is divided into different parts by four steps, i.e. user set partition, service request collection, cross-tier occupation and CRE occupation decision, while the service request of each user is taken into consideration. During the process implementation, the reference signal receiving power （RSRP） threshold is derived by mathematical means to judge cell edge macro users when a predefined ratio is given. Simulation results show that the proposed scheme reaches almost the same cell edge performance with the best existing option, meanwhile provides higher overall system throughput and better spectral efficiency. Therefore, much better balance is achieved.

LTE-A系统时域小区间干扰协调技术标准化研究

异构网络被LTE-A系统视为一种提升单位区域频谱效率的关键技术而得到广泛关注。然而,异构网络会带来严重的小区间干扰,小区间干扰协调因此成为3GPP标准化进程研究的重点。首先总结了异构网络及小区间干扰协调技术,然后介绍了目前3GPP中讨论的小区覆盖扩展(CRE:Cell Range Extension)和基于几乎空白子帧(ABS:Almost Blank Subframe)的时域小区间干扰协调技术。最后,基于动态系统级仿真平台,评估了CRE和ABS技术方案系统性能。

LTE室内覆盖新型建设方式及应用案例

本文介绍了几种新型的LTE室内覆盖系统建设方式,包括系统组网原理、应用场景、以及实际的应用案例。通过分析,展示了新型室内覆盖建设方式的应用方法和实施效果,并为室内覆盖工程设计提供指导。

Dynamic bias setting for range extension in LTE-advanced macro-pico heterogeneous networks

In co-channel deployment of macro cell and pico cells, cell range extension （RE）, a simple and typical cell association scheme, is introduced to achieve better load balancing and improve cell edge performance. In this article, a novel dynamic and distributed bias setting scheme is proposed for RE technique in macro-pico heterogeneous networks. In this strategy, the worst user throughput of each cell during an adjusting time interval T is obtained to change the bias values according to certain procedures, where an introduced indicator is used to freeze the possibility of increasing bias value if needed. Furthermore, silent state and coarse control process are employed to achieve low overheads and computational complexity. Simulation results show that the proposed scheme can greatly improve the cell-edge performance compared with the static bias setting strategies, while maintaining the overall cell performance at the same time.

传统扩频与混沌扩频的CDMA系统在Rappaport Indoor信道下的性能比较

对Logistic映射的混沌序列作为扩频序列构成的混沌扩频CDMA系统与传统的m序列扩频CDMA系统进行了对比研究 ,并且对其二者在RappaportIndoor信道下的性能在SPW上进行了仿真、分析 。