发言人说,公共安全过渡到基于LTE的解决方案,但PTT时间表仍不清楚

公共安全用户正受益于LTE可信网络上实现的面向数据的功能,并且还将向宽带平台过渡语音通信,尽管这一改变的时间表仍不清楚,据本周讨论这一话题的专家说

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“所以,我们已经采取行动,而且……我今天同意,这些东西需要共存。坦白地说,作为一名消防队长,你向我证明基于LTE的系统完全一样好或更好之前,我不会离开我的LMR系统。但现,它们共存,因为我需要它们。”

公共安全用户正受益于LTE可信网络上实现的面向数据的功能,并且还将向宽带平台过渡语音通信,尽管这一改变的时间表仍不清楚,据本周讨论这一话题的专家说

“我们总是这场谈话中结束,讨论什么时候或将来,甚至LTE是否会取代LMR,是吗,但我们可能想扭转这种对话,”JohnsonIWCE正构建论坛虚拟会议,这是与安全建筑联盟合作进行的。“它已经更换了一些部件。我不知道有人会购买基于LMR的数据系统,因为对我们的应用程序的渴求,我们的数据需求,是如此之多,以至于你不可能让它以一种理性的方式工作

“我认为更恰当的问题是,‘LMR的哪些工程特性不能被LTE取代?约翰逊说。“让我们面对现实吧。他们都使用回程。他们都用塔楼。他们都塔的底部使用无线电。他们用射频把信号传送到手机上。你有一个电池供电的手持设备,它是围绕着功能集和技术要求而设计的,然后它就变成了某种形式的控制器或NOC(网络操作中心)

布朗小组讨论中说:“我们正努力实现这一目标。”。“我们正三星的合作伙伴的帮助下,建立基于3GPP标准设备的关键业务(服务),以交付首席执行官如此雄辩地组合起来的解决方案

三星电子美国公司(Samsung Electronics America)移动B2B产品负责人鲍勃埃斯卡尔(Bob Escalle)表示,LTE推送通话服务通常可以为第一响应者提供更好的音频质量,它利用比窄带LMR更大的频谱

“大功率UE的优势于它们已经过验证,已经实验室和现场进行了测试。它们现已经正式推出,而且效果很好。”

布朗说:“我绝不会走进局长的办公室,试图从他手中夺走他的收音机;他很可能会拔掉我的两只胳膊,用两只手打我的头。”。“至少今天,我们希望能够扩大、补充和扩大使用、覆盖范围和能力

“我绝不会试图从公共安全的手中夺走那台LMR收音机。但有一天,谁知道呢?““

公共安全越来越依赖于面向数据的应用程序,这些应用程序只允许用户宽带环境中共享信息,包括视频和引发野火蔓延的服务等。约翰逊说,使用LTE设备定期访问这类信息,也可能导致语音通信的自然过渡

约翰逊说:“当你开始(使用宽带应用程序)时,作为第一反应者的智能手机是必不可少的。”。“一旦它是不可或缺的,如果你有按键通话功能,而且覆盖范围和建筑内的渗透是可靠的,那么某天你会让一个中尉对一个营长说:‘我用的是带按键通话功能的智能手机,我怎么会有这个东西(LMR便携式收音机)?'

“所以,当工作人员要求它,当它的(按键通话语音)性能达到比他们现有水平更好的水平时,就会发生这种情况。”

 

 

英文译文:

Public-safety users are benefiting from the data-oriented capabilities enabled by LTE on trusted networks today and also will transition voice communications to the broadband platform, although the timetable for this change remains unclear, according to experts discussing the topic this week.

“We always end up in this conversation about when—or will, even—will LTE replace LMR, and can it, but we may want to reverse that conversation,” Johnson said during IWCE’s In-Building Forum virtual conference, which was conducted in partnership with the Safer Buildings Coalition. “It’s already replaced some components. I don’t know of anybody buying LMR-based data systems anymore, because the thirst for our applications, our data needs, are so much that you can’t possibly make that work in a rational fashion.

But that could change in the future, depending on the development of push-to-talk voice offerings in the LTE realm, particularly those operated on public-safety-centric networks like the FirstNet system being built by AT&T, Johnson said.

“That’s true on both LMR and LTE. So, what’s irreplaceable? When you look at it that way, it’s feature sets and how it performs. So, will it [LTE replace LMR]? Well, it will replace it, if you solve the operational requirements, and it performs at least as good or better than LMR on push to talk, and it’s already outperforming it in the other areas.”

“We’re striving to get there,” Brown said during the panel discussion. “We’re building mission-critical [services], based on 3GPP-standard devices, with the help of our partners at Samsung, to deliver those solutions that the chief so eloquently put together.

Bob Escalle, head of products for the Mobile B2B of Samsung Electronics America, said one advantage that LTE push-to-talk services typically can provide to first responders is better audio quality that leverages much larger swaths of spectrum than is available in narrowband LMR.

“But you do lose some of the voice qualities—the inflection you hear around somebody’s voice—and you don’t have that on a broadband codec. You really get that rich voice coming out. So, it really is a voice-centric device, and it takes advantage—of course—of the broadband network.”

Some LTE proponents contend that “bring the network with you” solutions—particularly those that can be carried in backpacks and Pelican cases—could minimize the amount of time that first responders would need direct-mode functionality.

“Right now, we know it’s in a mobile-class router device—more of an in-vehicle-type device—but we know that there are a lot of UE companies that are working on it,” Escalle said. “Eventually, I think you’ll see a high-power UE version in a handheld device at some point in time. I think there are benefits around that.

Johnson said that LTE push-to-talk services will have to demonstrate a very high performance level before public-safety officials will consider switching off LMR systems that offer some trusted characteristics.

“I also think they’ve done a great job with security—encryption has been a great feature. And for the fact that they are excellent for in-building penetration and for long-range operation, both from the mobile and the handset. So these high-power units have served us well for a long time, even though it is push to talk and let up to listen, and public safety has evolved beyond that.

AT&T’s Brown said he certainly understands this sentiment.

“I would never try to take that LMR radio out of public safety’s hands. But one day, who knows?”

“When you start [using broadband applications], you make having a smartphone for a first responder indispensable,” Johnson said. “Once it’s indispensable, if you have push-to-talk capability and the coverage and in-building penetration is reliable, then you’re going to have a lieutenant say someday to a battalion chief, ‘How come I have this thing [LMR portable radio] when all I have used is my smartphone with push to talk?’

 

 

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