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【速搜问答】多频终端是什么

问答 admin 1个月前 (04-11) 34次浏览 已收录 0个评论

汉英对照:
Chinese-English Translation:

多频终端,指同时支持多种频带的终端设备,如手机,对讲机等。全世界共有40多种不同的网络频带,如同时支持中国移动,中国电信和中国联通三个电信运营商的多模多频手机就是多频终端的一种。

Multifrequency terminal refers to the terminal equipment supporting multiple frequency bands at the same time, such as mobile phone, walkie talkie, etc. There are more than 40 different network frequency bands in the world. At the same time, China Mobile is supported. The multi-mode multi frequency mobile phones of China Telecom and China Unicom are one of the multi frequency terminals.

多频终端,指同时支持多种频带的终端设备,如手机,对讲机等。全世界共有 40 多种不同的网络频带,如同时支持中国移动,中国电信和中国联通三个电信运营商的多模多频手机就是多频终端的一种。

Multifrequency terminal refers to the terminal equipment supporting multiple frequency bands at the same time, such as mobile phone, walkie talkie, etc. There are more than 40 different network frequency bands in the world. At the same time, China Mobile is supported. The multi-mode multi frequency mobile phones of China Telecom and China Unicom are one of the multi frequency terminals.

定义

definition

在电信中,多频终端(包括双频,三频,四频和五频设备)是支持多个射频频带的通信终端(特别是移动电话)。所有具有多个通道的设备使用多个频率;然而,频带是包含许多信道的一组频率。移动设备中的多个频带支持在不同区域之间的漫游,其中不同的标准用于移动电话服务。在频带在频率上被广泛分离的情况下,必须提供并行发送和接收信号路径电路,这增加了多频带装置的成本,复杂性和功率需求。

In telecommunication, multifrequency terminal (including dual band, triple band, quadruple band and quintuple band devices) is a communication terminal supporting multiple radio frequency bands (especially mobile phones). All devices with multiple channels use multiple frequencies; however, a frequency band is a set of frequencies that contain many channels. Multiple bands in mobile devices support roaming between different areas, in which different standards are used for mobile phone services. When the frequency bands are widely separated in frequency, it is necessary to provide parallel transmission and reception signal path circuits, which increases the cost, complexity and power requirements of multi band devices.

多频

Multifrequency

术语 QUAD BAND(四频)描述了支持四个频带的设备:850 和 1900MHz,主要用于美洲(ITU 2 号区域),以及在其他地方使用的 900 和 1800MHz 频带。大多数 GSM/ UMTS 手机支持所有四个频段,而大多数 CDMA2000/ 1xRTT 电话(主要是北美和仅有语音传输的电话)不支持,因此仅被认为是双频带设备。一些电话支持国内频率,但只有一个外国有限漫游,称他们为三频电话。

The term Quad Band describes devices that support four bands: 850 and 1900MHz, mainly used in the Americas (ITU area 2), as well as the 900 and 1800MHz bands used elsewhere. Most GSM / UMTS phones support all four bands, while most CDMA2000 / 1xRTT phones (mainly North American and voice only phones) do not, so they are only considered dual band devices. Some phones support domestic frequencies, but only one foreign country has limited roaming. They are called tri band phones.

术语 penta-band(五频)描述了支持第五频带(通常是世界上大部分地区的 2100MHz 频带)的设备。高级无线服务(AWS)1700 MHz 频段也有越来越多的使用。

The term penta band describes devices that support the fifth band (usually the 2100mhz band in most parts of the world). Advanced wireless services (AWS) 1700mhz band is also increasingly used.

4G 频段

4G band

中国

China

为了防止信号相互干扰,因而将频率划分为不同的频段分给各个电信运营商,2013 年“TD-LTE 技术与频谱研讨会”上,工信部已对 TDD 频谱规划使用做了详细说明,并向三大电信运营商正式分配了 TD-LTE 扩大规模试验频段。

In order to prevent mutual interference between signals, the frequency is divided into different frequency bands and distributed to various telecom operators. At the “TD-LTE technology and spectrum seminar” in 2013, MIIT has made a detailed description of TDD spectrum planning and use, and formally allocated the TD-LTE scale-up test frequency bands to the three major telecom operators.

具体来说,4G 频段划分如下:

Specifically, the 4G band is divided as follows:

中国移动共获得 130MHz,分别为 1880 -1900 MHz、2320-2370 MHz、2575-2635 MHz;

China Mobile received a total of 130MHz, 1880-1900 MHz, 2320-2370 MHz and 2575-2635 MHz respectively;

中国联通获得 40MHz,分别为 2300-2320 MHz、2555-2575 MHz;

China Unicom obtained 40MHz, 2300-2320mhz and 2555-2575mhz respectively;

中国电信获得 40MHz,分别为 2370-2390 MHz、2635-2655 MHz。

China Telecom obtained 40 MHz, 2370-2390 MHz and 2635-2655 MHz respectively.

美国

U.S.A

在美国,两个最大的运营商正在在 700 MHz 频段中实现 4G LTE,这是在数字电视过渡期间从电视广播重新分配的。由于 700 MHz 频段具有更好的无线电传播特性,允许移动电话信号穿透更深的建筑物,电视台被迫移动到更低的 UHF 频率,甚至更差的 VHF 频率,以及更差的移动电视甚至常规的地面电视性能其衰减小于 1700 MHz 或 2100 MHz 频带。

In the United States, the two largest operators are implementing 4G LTE in the 700 MHz band, which was reallocated from television broadcasting during the digital TV transition. As the 700 MHz band has better radio transmission characteristics, allowing mobile phone signals to penetrate deeper buildings, TV stations are forced to move to lower UHF frequency, even worse VHF frequency, and worse performance of mobile TV and even conventional terrestrial TV, whose attenuation is less than 1700 MHz or 2100 MHz band.

AT&T 移动设备使用全国前电视频道 55(从高通停止的 MediaFLO 付费电视服务购买),以及在人口稠密地区如加利福尼亚和东北走廊的频道 56。 Verizon Wireless 保持正好在仍在使用中的 TV 信道 51 之上的频率,导致相邻信道干扰,阻止载波使用它们,直到发生计划的自顶向下频谱重新分组。它最近在前电视频段内获得了更高的块,计划首先使用。

At & T mobile devices use the nation’s top TV channel 55 (purchased from the mediaflo pay TV service stopped by Qualcomm), as well as channel 56 in densely populated areas such as California and the Northeast corridor. Verizon Wireless maintains a frequency just above the TV channel 51 that is still in use, causing interference between adjacent channels and preventing carriers from using them until a planned top-down spectrum regrouping occurs. It recently gained a higher block in the former TV band and is planned to be used first.


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