无线侧提升VoLTE用户语音感知的优化策略研究

VoLTE是在4G网络全IP条件下的端到端语音解决方案,能提供更短的接入时延和更好的语音质量。在建立语音质差模型和分析空口丢包原理的基础上,梳理无线侧VoLTE语音感知的优化流程,对无线侧影响VoLTE语音感知的6个维度进行专项优化整治,实施效果较好,为今后VoLTE用户语音感知优化提供参考和指导。     

基于系统化OTT对比分析的VoLTE感知提升研究

为响应中国移动总部“研究出一套提高VOLTE用户感知度的方法,做出一个样板点”的号召,湖北公司以VoLTE和最热门OTT业务微信对比研究为基础,理论和实际相结合进行VoLTE优化方案设计,提出了一整套解决方案,该方案以优化接续时延为中心、以位置获取和冗余语音算法为辅、减少连续丢包缩短VoLTE接续时延、提升语音感知及弱场高干扰场景VoLTE性能。     

VoLTE应用价值与网络优化方向

本文根据移动通信用户及运营商对于VoLTE（移动语音技术）应用价值的需要,做好VoLTE网络优化方向的研究工作。根据各类语音业务解决方案的特点和优势,选择VoLTE的发展方向。同时做好eSRVCC的切换成功率、呼叫建立时延、切换时延、MOS值等指标优化研究工作,积极地促进VoLTE服务业务开展。     

VoLTE业务的性能分析及优化研究

VoLTE主要是指需要将全面的业务承载在4G网络上使用的一种IP数据传输技术,通过在统一网络下,能够促进数据与语音业务的有机统一.通过使用VoLTE,为用户带来更低的接入时延,有助于提升用户的语音视频通话质量.因此,需要推动VoLTE发展,不断的强化无线频谱的利用效率,降低网络成本,提升用户体验效果,促进移动宽带语音业务的快速发展.本文针对VoLTE业务,对其自身的业务性能进行分析,并且提出了VoLTE业务的优化方法.     

VoLTE规模商用保障支撑探讨

目前,全球VoLTE呈快速增长态势,国内VoLTE尚处于开通初期优化时间短,优化经验还有待积累。在目前各运营商4G网络已基本成熟的情况下,为保障VoLTE规模商用,提升VoLTE语音质量和用户体验。本文对中国电信VoLTE网络质量保障支撑进行了深入分析和研究,从网络质量清障摸查、指导前端精准放号等方面保障VoLTE规模商用,通过业务和用户的保障更好的提高用户感知,并就商用后用户体验保障提出优化建议。     

基于延迟快速调度算法的Vo LTE低丢包评估

为了改善VoLTE语音通话时的用户感知,提升VoLTE通话的语音质量,参考延迟快速调度算法,从承载VoLTE语音的相关网元入手,分析其主要功能和相关参数,提出VoLTE语音低丢包问题优化评估研究,建立参数模型,选出最优参数并推广。     

基于IMS的VoLTE语音业务实现方案的研究及优化

针对TD-LTE网络、无线接入网E-UTRAN以及EPC的网络结构功能上的变化,指出TD-LTE语音业务面临的问题,分析基于IMS网络的VoLTE/SRVCC语音实现的系统架构,详细说明主叫VoLTE to VoLTE语音业务的信令流程,并提出一种信令优化方案,实践证明该方案能够降低VoLTE语音通话时延,有效提升4G用户语音业务感知.     

基于信令消息的VoLTE接续时延优化

承载于LTE的语音业务(VoLTE)无线频谱利用效率优于传统CS语音,高清语音和视频编解码的引入显著提高了通信质量,VoLTE呼叫接续时长较传统CS语音大幅缩短.主要针对VoLTE的接续时延,提出基于信令消息的VoLTE接续时延优化,依据VoLTE终端在接续过程中不同阶段的网元间交互的信令消息,从寻呼、域选、资源预留3个阶段分别对影响VoLTE接续时延的因素进行针对性分析,并给出相应的解决方案.     

5G参数与VoLTE配置优化降低EPS Fallback时延的研究

针对当前5G网络语音业务优化中,EPS Fallback(演进分组系统回落)时延较高影响语音感知的问题,对5G DRX(非连续接收)、事件发生到上报时间差参数优化与VoLTE(长期演进语音承载)配置优化进行研究。通过DCCH(专用控制信道)优先级、DRX功能、呼叫时延优化、事件上报时间差等关键参数优化,优化EPS Fallback时延,从而提升5G用户语音接通速度,提升用户语音业务感知。     

一种分域分段的VoLTE业务时延优化方法

呼叫建立时延做为VoLTE关键性能指标,对其进行优化,可以提高用户对VoLTE业务满意度。本文以V2V呼叫端到端信令流程为基础,通过对VoLTE业务时延进行建模,提出一种分域分段的VoLTE时延优化和指标监控方法,旨在通过“分段监控、分段定位和分段优化”及时发现、定位和优化VoLTE时延问题。     

Max-utility subcarrier allocation for heterogeneous services in wireless OFDM system

In future wireless network, one user will require multiple homogeneous or heterogeneous services simultaneously. Then, the scheduling algorithm is not only responsible for assigning a resource block to different users but also sharing the assigned resource block among multiple services for one user. Most of the traditional scheduling algorithms are designed to serve one service per user, and cannot be applied directly to this scenario because of the fairness criterion. This article focuses on adaptive resource allocation for multiple services per user at the downlink of orthogonal frequency division multiplexing (OFDM) based system. This article addresses this integrative resource scheduling problem based on utility function. First, the optimal algorithm for dynamic subcarrier allocation and share is deduced for homogeneous best-effort service system. Then the algorithm is extended to heterogeneous services system by classifying the delay sensitive service according to the head-of-line packet delay. The design goal is to maximize aggregate utility function to exploit multiuser diversity gain to the greatest extent even as guaranteeing quality of service (QoS) for delay sensitive service.     

Mobility aware edge service migration strategy

To address the problem of load imbalance among edge servers and quality of service degradation caused by dynamic changes of user locations in mobile edge computing networks,a mobility aware edge service migration algorithm was proposed.Firstly,the optimization problem was formulated as a mix integer nonlinear programming problem,with the goal of minimizing the perceived delay of user service request.Then,the delay optimization problem was decoupled into the edge service migration and edge node selection sub-problems based on the Lyapunov optimization approach.Thereafter,the fast edge decision algorithm was proposed to optimize the resource allocation and edge service migration under a given radio access strategy.Finally,the asynchronous optimal response algorithm was proposed to iterate out the optimal radio access strategy.Simulation results validate the proposed algorithm can reduce the perceived delay under the service migration cost constraint while comparing with other existing algorithms.     

一种适用于W-CDMA系统的多业务无线资源调度算法

3G系统将以分组交换方式提供语音、数据、视频等具有不同QoS要求的多种业务，资源调度对保证系统服务质量和提高资源利用效率起关键作用．本文提出了一种基于业务类型、当前待发送负荷以及剩余延时限的时间调度策略和基于资源优化的资源调度策略，并使无线链路的传输质量与业务的优先级水平一致．通过系统仿真评价了算法的性能．     

Cross-Layer Radio Resource Allocation for Multicarrier Air Interfaces in Multicell Multiuser Environments

Packet scheduling over shared channels is one of the most attractive issues for researchers dealing with radio resource allocation in wireless networks as modern systems' different traffic types, with different application requirements, need to coexist over the air interface. Recently, attention has been attracted to multicarrier techniques and the application of cross-layer approaches to the design of wireless systems. In this paper, a radio access network using a multicarrier air interface is considered in a multicell multiuser context. We propose a new cross-layer scheduling algorithm that manages channel, physical layer, and application-related information; we compare its performance with a previously published cross-layer strategy and with simpler well-known channel-aware or channel-unaware techniques and then discuss its optimization. We investigate the performance in terms of perceived user quality and fairness in the presence of mixed realistic traffic composed of H.264 video streaming with tight bounds on the delay jitter and file transfer protocol (FTP) data. To support video traffic, application-suited buffer-management techniques are also considered in conjunction with scheduling, and link adaptation is implemented at the physical layer to better exploit channel fluctuations. The role of scheduling and resource-allocation functionalities are discussed. It is shown that the cross-layer strategy proposed guarantees the same performance obtained by the previously published algorithm while reducing complexity. Moreover, under heavily loaded conditions, the cross-layer scheduling strategy provides a significant gain with respect to simple channel-aware or channel-unaware techniques.     

正交频分多址系统中一种面向多业务应用的自适应资源分配算法

针对正交频分多址(OFDMA)系统下行链路多业务自适应调度的问题,该文首先以最大化系统吞吐量为优化目标、每种业务的服务质量(QoS)保证为约束条件,建立了一种通用的多业务自适应资源分配模型。为解决此优化问题,提出了一种具体的自适应资源调度算法。该算法对实时业务按照用户选择最好的信道的原则分配尽可能少的资源以保证其QoS,对非实时业务把尽可能多的剩余资源按照信道选择最好的用户的原则进行分配,充分利用信道资源,提升系统容量。仿真结果表明,该算法保证了下行OFDMA系统吞吐量的同时,在实时业务的延时和丢包率等方面有一定的优越性。     

VoLTE和CS语音补充业务一致性方案研究

针对VoLTE的IMS MMTel业务和传统CS域补充业务共存场景,总结了3GPP以及其他几种CS/IMS公共语音SS业务数据同步方案,并对各方案的前景和适用性作了分析。这些方案使得用户在IMS域和CS域具有一致的补充业务体验。     

小卫星业务调度路由优化

针对小卫星通信链路交换频繁和低资源利用率的问题，提出了一种基于调度的小卫星路由优化策略。建立起小卫星星座模型，根据其运行方向(与赤道平面近似垂直)和所在维度确定链路的实时连接策略，优化其路由路径。面对持续增长的网络业务与有限的星上资源的矛盾，将业务数据包分类为实时性数据包和非实时性数据包，实行加权轮询调度保证其服务质量和资源的利用率。仿真结果证明，相比已有小卫星路由算法，优化的路由算法可以有效减小数据传输时延并增加系统吞吐量。     

基于QoS保证的多用户OFDM系统跨层资源分配

针对正交频分复用(OFDM)系统资源分配和调度问题,提出一种基于第三代移动通信长期演进(LTE)系统的分块跨层资源分配算法。此算法考虑物理层的信道状态信息、媒体接入层(MAC)的有限用户缓存队列长度、用户的丢失率和时延等QoS要求,以提高系统频谱效率为总体目标。通过从实时视频业务和混合业务两种业务类型下进行大量对比分析,得出提出的算法能有效提高系统的频谱效率和降低系统时延。