Verizon选择MCPTT供应商,预计今年推出MCPTT服务

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据Verizon的一位官员透露,Verizon已经选择了一家供应商来提供基于3GPP标准的关键任务推送通话服务,并预计将于今年年底推出

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Verizon公共部门产品开发总监尼克·尼兰昨天接受IWCE紧急通信部采访时说:“我们已经选定了一家关键任务的按键通话供应商。”。

Verizon MCPTT的发布将遵循FirstNet宣布的基于3GPP标准的推送通话服务,FirstNet是由AT&T和Southern Linc共同建设和维护的全国公共安全宽带网络,美国东南部地区性航空公司,也为南方公用事业公司提供通信

据Verizon的一位官员透露,Verizon已经选择了一家供应商来提供基于3GPP标准的关键任务推送通话(MCPTT)服务,并预计将于今年年底推出

Verizon公共部门产品开发总监尼克·尼兰(Nick Nilan)昨天接受IWCE紧急通信部采访时说:“我们已经选定了一家关键任务的按键通话供应商。”。“我们预计今年可以宣布这一点,但我不准备透露这是谁或确切的日期

“我们正努力确保产品与它所说的完全一致,它是至关重要的。我们要确保,当它推出时,它已经为我们的公共安全客户做好了充分的准备。它将于今年晚些时候推出。”

采访结束后,Verizon的一位发言人证实,这家运营商巨头计划今年年底宣布其MCPTT供应商并推出MCPTT服务

Verizon MCPTT的发布将遵循FirstNet宣布的基于3GPP标准的推送通话服务,FirstNet是由AT&T和Southern Linc共同建设和维护的全国公共安全宽带网络,美国东南部地区性航空公司,也为南方公用事业公司提供通信

tetralk是为满足快速呼叫的标准而设计的,包括p23p的快速呼叫和推送性能指标。用于交付MCPTT的平台也被设计为支持任务关键型视频(MCVideo)和任务关键型数据(MCData)服务功能,通常统称为MCX服务

过去的几年中,有多家供应商开发了从服务器到客户机接口的MCPTT组件,这些组件ETSI插件测试期间表现出了互操作的能力。然而,一些业内人士声称,3GPP标准中具有挑战性的性能指标只有实际情况下才能实现,前提是MCPTT供应商整个运营商的网络中紧密集成

南方林肯似乎正通过部署爱立信的MCPTT解决方案,它还将包括eMBMS功能,旨更有效地传递一对多组呼叫

AT&T宣布>

AT&T的官员们早就承诺FirstNet用户将能够从多家MCPTT供应商中进行选择。多位业内人士表示,AT&T已经完成了选择第二家MCPTT供应商的采购流程,但AT&T拒绝回应IWCE紧急通信部门就此事提出的询问

FirstNet PTT的表现受到了新泽西州一个警察局的用户今年早些时候测试了这项服务,但至今还没有宣布FirstNet PTT被采用

与此同时,AT&T和Verizon继续提供运营商集成的推送通话(PoC)服务,这些服务利用摩托罗拉解决方案公司拥有的Kodiak技术。尽管两家运营商都使用Kodiak平台,但一家运营商的PoC用户不投资其他网关解决方案的情况下,无法与其他运营商的PoC用户通话

考虑到这一点,随着企业寻求灵活、经济高效的解决方案,如L3Harris的ESChat和BeOn,最近获得了新的吸引力,按键通话解决方案可以快速部署以响应与COVID-19大流行相关的挑战

这种顶级的PoC产品不能满足MCPTT的高性能指标,但是它们通常能够不同的LMR和LTE系统的用户之间实现更大的互操作性。此外,支持者还指出,公共安全优先和先发制人地访问FirstNet和Verizon LTE网络,消除了对超顶级PoC服务(可靠连接的可用性)的最大争论

多年来,业内专家一直表示,兼容PoC和MCPTT的服务可以提供比LMR更好的网络音频质量,因为可以使用更高级别的编解码器,这是因为LTE设备更接近蜂窝站点,而且LTE比窄带LMR系统提供了更多的可用带宽

然而,当网络连接不可用时,基于LTE的推送通话解决方案是否能够达到LMR技术所能提供的性能,这是一个重大的问题

到目前为止,三星是唯一一家公开宣称其设备能够支持prospere的制造商,prospere是没有LTE网络的情况下提供直接模式通信的LTE标准。三星官方表示,韩国已经使用了散文,但该公司拒绝就直接模式功能的表现发表评论

即使散文行得通,基于物理学的挑战,怀疑论者质疑这项技术是否会被认为对公共安全有用

公共安全部门习惯于通过具有外部天线的LMR设备进行直接模式通信,这些设备使用3到5瓦的功率传输信号,支持数英里的通信覆盖,而无需网络的帮助

相比之下,LTE设备通常有内部天线,发射信号仅需200毫瓦的功率,这将大大限制其覆盖范围。然而,PoC解决方案的支持者指出,LTE和Wi-Fi网络的普遍存,以及可部署的LTE解决方案的快速发展,轮子上的电池,无人机上的电池,以及背包和鹈鹕箱包,可以大大减少大多数公共安全场景中直接模式通信的需求

考虑到这一点,Southern Linc先前表示,它一直与Sonim Technologies合作开发一种直接模式附件,该附件连接到坚固的Sonim设备顶部,并使用LoRaWAN—一种低功耗、广域网络协议,未经许可的900 MHz频谱上运行

AT&T和Verizon都没有透露他们计划如何提供直接模式MCPTT的任何细节

 

 

英文译文:

Verizon has chosen a vendor to deliver mission-critical-push-to-talk (MCPTT) service based on the 3GPP standard and expects to launch the offering by the end of this year, according to a Verizon official.

“We have selected a mission-critical-push-to-talk vendor,” Nick Nilan, Verizon’s director of public-sector product development, said yesterday during an interview with . “We anticipate being able to announce that this year, but I’m not ready to tip my hat as to who that is or exactly a date.

“We’re working to make sure that the product is exactly what it says it is—mission critical. We want to make sure that, when it launches, it’s fully ready for our public-safety customers. It will be coming out later this year.”

Following the interview, a Verizon spokesperson confirmed that the carrier giant plans to announce both its MCPTT vendor and launch an MCPTT service by the end of the year.

A Verizon MCPTT launch would follow the announced offerings of push-to-talk-over-cellular offerings based on the 3GPP standard announced by FirstNet—the nationwide public-safety broadband network being built and maintained by AT&T—and Southern Linc, the southeast U.S. regional carrier that also provides communications for Southern Company utility.

MCPTT is a push-to-talk standard established by 3GPP that is designed to meet the key performance metrics of LMR push-to-talk technologies like P25 and TETRA, including low latency to enable quick call-setup times. The platform used to deliver MCPTT also is designed to support mission-critical video (MCVideo) and mission-critical data (MCData) services—capabilities often referenced collectively as MCX services.

There are multiple vendors that have developed MCPTT components—from servers to client interfaces—that have exhibited the ability to interoperate during ETSI plugtests during the past several years. However, several industry sources have asserted that the 3GPP standard’s challenging performance metrics only can be achieved in real-world scenarios if the MCPTT vendor is tightly integrated throughout a carrier’s network.

Southern Linc appears to be pursuing such an end-to-end approach by deploying Ericsson’s MCPTT solution, which also is expected to include eMBMS functionality that is designed to enable more efficient delivery of one-to-many group calls.

AT&T announced the availability of FirstNet PTT on March 31, the due date for the carrier to provide a MCPTT-compliant service under its contract with the FirstNet Authority. To date, AT&T officially has not announced the vendor for the service, but Samsung provided the only FirstNet PTT-capable device.

Officials for AT&T have long vowed that FirstNet subscribers would be able to choose from multiple MCPTT vendors. Multiple industry sources have indicated that AT&T has completed the procurement process to select a second MCPTT vendor, but AT&T has declined to respond to inquiries from on the matter.

FirstNet PTT performance was applauded by users in a New Jersey police department that tested the service early this year, but there have been no announcements of FirstNet PTT being adopted to date.

Meanwhile, both AT&T and Verizon continue to offer carrier-integrated push-to-talk-over-cellular (PoC) services that utilize Kodiak technology owned by Motorola Solutions. Despite the fact that both carriers use the Kodiak platform, PoC subscribers on one carrier are not able to talk to PoC subscribers on the other carriers without investing in additional gateway solutions.

With this in mind, over-the-top PoC solutions such as ESChat and BeOn from L3Harris recently have gained new levels of traction as enterprises have sought flexible, cost-effective, push-to-talk solutions that can be deployed quickly in response to challenges associated with the COVID-19 pandemic.

Such over-the-top PoC offerings do not meet the high-performance metrics of MCPTT, but they often enable much greater interoperability between users of disparate LMR and LTE systems. In addition, proponents note that public safety’s to prioritized and preemptive access to the FirstNet and Verizon LTE networks has removed the greatest argument against over-the-top PoC services—the availability of reliable connectivity.

For years, industry experts have said that PoC and MCPTT-compliant services could provide better on-network audio quality than LMR, because higher-level codecs can be used, thanks to the closer proximity of LTE devices to cell sites and the fact that LTE makes much more bandwidth available than a narrowband LMR system.

However, there are significant questions whether LTE-based push-to-talk solutions will ever match the performance that LMR technologies can deliver when network connectivity is not available.

To date, Samsung is the only manufacturer that publicly claims it has devices that are capable of supporting ProSe, the LTE standard for delivering direct-mode communications when no LTE network is available. Samsung officials have said ProSe has been used in South Korea, but the company has declined to comment on the performance of the direct-mode functionality.

Even if ProSe works, skeptics question whether the technology would be considered useful to public safety, based on the physics challenges.

Public safety is accustomed to direct-mode communications through LMR devices that feature external antennas and transmit signals using 3 to 5 watts of power, supporting miles of communications coverage without the help of a network.

In contrast, LTE devices typically have internal antennas and transmit signals using just 200 milliwatts of power, which would greatly limit their coverage range. However, proponents of PoC solutions note that ubiquity of LTE and Wi-Fi networks, along with the rapid development of deployable LTE solutions—cells on wheels, cells on drones, as well as backpack and Pelican-case packages—could dramatically reduce the need for direct-mode communications in most public-safety scenarios.

With this in mind, Southern Linc previously indicated that it has been working with Sonim Technologies on the development of an direct-mode accessory that attaches to the top of rugged Sonim devices and uses LoRaWAN—a low-power, wide-area networking protocol—that operates on unlicensed 900 MHz spectrum.

Neither AT&T nor Verizon have unveiled any details about how they plan to provide direct-mode MCPTT.

 

 

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