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一、频谱需求频谱作为无线通信的基础是最为宝贵资源之一，为此关于52.6GHz以上5G(NR)的需要的研究已根据WRC-19后的所有新信息进行了修订。52.6GHz以上频谱可用的连续带宽数量巨大，相对未充分利用的毫米波(mmWave)频谱为提供高速数据速率、低延迟和高容量提供了绝佳的机会。目前52.6GHz以上频段主要受到器件性能的限制，如功率放大器(PA)效率较差、相位噪声损伤较大、前端插入损耗增加以及低噪声放大器(LNA)和模数转换器(ADC)噪声。此外，52.6GHz以上频率的频段面临着较高的传播和穿透损耗挑战。 二、实际用例对于52.6GHz~114.25GHz之间的5G(NR)各种用例基本延用Sub 6G和mmWave支持的业务。用例与无线接口不存在一对一的映射如Uu、slidelink等。52.6GHz以上频段可适用用例如下： 三、频段分配国际电联无线电规则对52.6GHz~116GHz频率范围内的分配信息(见下表1)。其中带有注释的列包含有关现有服务的保护要求的信息(一部分)。 Frequency band(GHz) | Allocated to Mobile Service on a primary basis | Allocated to Fixed Service on a primary basis | Comments | 52.6-54.25 | No | No | EESS (passive) and SRS (passive), All emissions are prohibited in this band, footnote 5.340 | 54.25-55.78 | No | No | EESS (passive) and SRS (passive) | 55.78-59 | Yes | Yes | EESS (passive) and SRS (passive) This band available for high-density applications in the fixed
service, footnote 5.547 | 59-59.3 | Yes | Yes | EESS (passive) and SRS (passive) Radiolocation | 59.3-64 | Yes | Yes | Radiolocation | 64-65 | Yes | Yes | This band available for high-density applications in the fixed
service, footnote 5.547 | 65-66 | Yes | Yes | This band available for high-density applications in the fixed
service, footnote 5.547 | 66-71 | Yes | No | The frequency band 66-71 GHz is identified for use by
administrations wishing to implement the terrestrial component of International
Mobile Telecommunications (IMT). This identification does not preclude the
use of this frequency band by any application of the services to which this
frequency band is allocated and does not establish priority in the Radio
Regulations. | 71-76 | Yes | Yes | WRC-19 AI 1.13 frequency band, sharing and compatibility studies
and potential limitations information in clause 2.2. | 76-81 | No | No | Radiolocation | 81-86 | Yes | Yes | WRC-19 AI 1.13 frequency band, sharing and compatibility studies
and potential limitations information in clause 2.2. | 86-92 | No | No | EESS (passive) and SRS (passive), All emissions are prohibited in this band, footnote 5.340 | 92-94 | Yes | Yes | Radiolocation | 94-94.1 | No | No | Radiolocation | 94.1-95 | Yes | Yes | Radiolocation | 95-100 | Yes | Yes | Radiolocation | 100-102 | No | No | EESS (passive) and SRS (passive), All emissions are prohibited in
this band, footnote 5.340 | 102-105 | Yes | Yes | N/A | 105-109.5 | Yes | Yes | SRS (passive) | 109.5-111.8 | No | No | EESS (passive) and SRS (passive), All emissions are prohibited in
this band, footnote 5.340 | 111.8-114.25 | Yes | Yes | SRS (passive) | 114.25-116 | No | No | EESS (passive) and SRS (passive), All emissions are prohibited in
this band, footnote 5.340 |
四、频谱可用进展
在52.6至116GHz范围内66-76GHz(包括66-71和71-76GHz)和81-86 GHz频段正在WRC-19议程第1.13项下进行研究以用于潜在的IMT识别。共享和兼容性研究的结果、潜在的技术和监管条件包含在CPM报告草案中，WRC-19将就IMT识别或不识别IMT以及相应的技术和监管条件做出最终决定。 66-71GHz中对ISS、MSS(地对空)进行的研究表明共享是可行的，对于MSS(空对地)的情况需要几公里的间隔距离。是否需要研究解决 IMT对RNS的干扰仍存在争议。因此，无法得出该频段的监管和技术条件的最终结论。 71-76GHz对FS、RLS和FSS(空对地)进行了研究，表明与FS和FSS共享是可行的。然而，需要对IMT BS和UE无用发射进行额外限制以保护相邻频段76-81GHz中的RLS。
针对81-86 GHz，开展FS、FSS(地对空）、RAS(带内和邻带)、EESS(无源)和RLS的研究。不需对SRS(被动)进行研究，因为该服务正在处理其他行星周围的传感器，预计不会出现干扰问题。也没有针对MSS进行研究。这些研究结果表明，与FS、FSS和RAS(带内和邻带)共享是可行的。请注意，需要对IMT BS和UE无用发射进行额外限制，以确保对相邻频段76-81 GHz中EESS(无源)和相邻频段86-82GHz中的RLS进行保护。
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