Unit3,Radio Network Optimization,Communication English,Contents,UNIT 3 Radio Network Optimization,3,WCDMA/UMTS Optimization Methodology,Reading 1,UNIT 3 Radio Network Optimization,4,Contents,WCDMA/UMTS Optimization Methodology,Network optimization can initially be seen as a very involving task as a large number of variable are available for tuning impacting different aspect of the network performance. To simplify this process a step by step approach is proposed in Figure 6 3. This approach divides the optimization in simpler steps, each step focusing on a limited set of parameters:,5,首先网络优化可以看作是一项复杂的任务，因为协调网络各方面性能涉及许多变量。图1提出了简化这一程序的步骤。这一方法把优化分为简单几步，每一步关注有限的一组参数。,WCDMA/UMTS Optimization Methodology,RF optimization will focus mainly on RF configuration and in a lesser extend on reselection parameters. Voice optimization will focus on improving the call setup (Mobile Originated and Mobile Terminated) and call reliability thus focusing mainly on access and handover parameters.,6,无线优化主要关注射频配置，其次是重选参数。 语音优化关注改进通话建立（移动起呼和终呼）以及通话可靠性，因此主要关注接入和切换参数。,WCDMA/UMTS Optimization Methodology,Advance services optimization will rely extensively on the effort conducted for voice. The initial part of the call setup are similar for all type of services and vendor have not at this point defined different set of handover parameters for different services. Consequently, optimizing these services will focus on a limited set of parameters, typically power assignment, quality target, and Radio Link Control (RLC) parameters.,7,增值业务优化是基于对语音业务的优化。 对于各种服务来说通话建立的起呼方都是相似的，供应商在这一点上还没有为不同的业务定义不同的切换参数。因此，优化这些服务就要关注有限的一组参数，主要是功率分配，质量目标以及无线链路控制参数。,WCDMA/UMTS Optimization Methodology,Inter-system (also known as inter-RAT) change (both reselection and handover) optimization is considered once the WCDMA layer is fully optimized. This approach will ensure that inter-system parameters are set corresponding to finalize boundaries rather than set to alleviate temporary issues due to sub-optimal optimization.,8,一旦WCDMA完全优化，才能考虑系统间（也称为技术间）转换（重选及切换）优化。这一方法可以保证系统间参数的设置与最终的范围一致，而不是缓解暂时的由次优化引起的问题。,WCDMA/UMTS Optimization Methodology,9,WCDMA/UMTS Optimization Methodology,Figure 1: Optimization process is simplified by isolating basics steps. Only a limited set of variable is considered at each step. 图1： 通过划分为简单的步骤简化优化过程，每步只需涉及有限的一组变量。,图1：通过划分为简单的步骤简化优化过程，每步只需涉及有限的一组变量。,10,WCDMA/UMTS Optimization Methodology,Even after careful RF planning, the first step of optimization should concentrate on RF. This is necessary as RF propagation is affected by so many factors (e.g., buildings, terrain, vegetation) that propagation models are never fully accurate. RF optimization thus takes into account any difference between predicted and actual coverage, both in terms of received signal (RSCP) and quality of the received signal (Ec/No). In addition, the same qualitative metrics defined for planning should be considered: cell overlap, cell transition, and coverage containment of each cell.,11,即使是经过细致的RF规划，优化的第一步还是应集中于RF。 这很必要，因为RF传播受诸多因素影响（如：楼宇，地形，植被等），因此传播模型很难达到完全精确。因而RF优化要考虑到规划和实际覆盖的区别，包括接收信号（RSCP)及其质量(Ec/No). 此外，规划中的定性指标应该考虑到：小区重叠，小区转换，小区的覆盖容量。,WCDMA/UMTS Optimization Methodology,At the same time, assuming that a UE is used to measure the RF condition in parallel with a pilot scanner, reselection parameters can be estimated considering the dynamics introduced by the mobility testing: during network planning dynamics cannot be considered, as network planning tools are static by nature, only simulating at one given location at a time, irrespectively of the surrounding. In addition, once the RF conditions are known, dynamic simulation can be used to estimate the handover parameters, even before placing any calls on the network.,12,同时，假设用一个UE同时来测量RF与导频扫描的状况，重选参数可以根据移动测试得出的动态状况进行估算：网络规划中无法考虑动态，因为网络规划工具本身是静态的，只模拟某一时间某一指定位置，不考虑周边环境。此外，一旦已知RF状况，网络中无呼叫也可用动态模拟估算切换参数。,WCDMA/UMTS Optimization Methodology,Service optimization is needed to refine the parameter settings (reselection, access, and handover). Because the same basic processes are used for all types of services, it is best to set the parameters while performing the simpler and best understood of all services: voice. This is fully justified when the call flow difference for the different services are considered, as illustrate in Figure 7 and Figure 8. Either for access or for handover, the main difference between voice and other service is the resource availability.,13,服务优化被用来改善参数设置（重选、接入和切换）。因为同一种基本流程可用于所有业务，所以要把所有业务中最简单、最易于理解的语音业务的参数先设置好，然后再考虑不同业务流量的区别进行充分调整，如图7和8所示。不论是接入或切换，话音与其它服务间的主要区别即是可用资源。,WCDMA/UMTS Optimization Methodology,Testing with voice service greatly simplifies the testing procedure and during analysis limits the number of parameters, or variable, to tune. During this effort, parameter setting will be the main effort. Different set of parameters are likely to be tried to achieve the best possible trade-offs: coverage vs. capacity, call access (Mobile Originated and Mobile Terminated) reli