jammer block
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In order to ensure the leading level of 5G network, the 2.6GHz frequency band is given priority to adopt the 100MHz networking solution design, which coincides with the operating frequency of the deployed TD-LTE system in the D1/D2 frequency band. In areas where TD-LTE frequency bands have not been cleared in the D1/D2 frequency band, 5G will encounter serious technical problems with LTE co-channel interference. In addition, according to the summary of 5G interference technology examples, 5G in the 2.6GHz frequency band will also encounter interference technology from the multi-channel microwave distribution system (MMDS) of the radio and television network, interference technology from video surveillance network transmission equipment, and pseudo base stations. Jamming technology and jammer jamming technology, etc. Therefore, studying and identifying 5G interference problems is of great practical significance to promote 5G interference technology to solve problems and ensure customer experience and business process understanding.
1. LTE co-channel interference
In areas where TD-LTE in the D1/D2 frequency band has not been cleared, under long-term load conditions in TD-LTE residential areas, terminal equipment will cause increased co-channel interference in the same covered 5G residential areas, seriously affecting the characteristics of 5G Internet. The strength of LTE co-channel interference is closely related to factors such as the size of the covered area, the wireless network environment, and the traffic volume of LTE adjacent areas.
signal jammer
The main characteristics of LTE co-channel interference are that the 163~273PRB noise floor used in the D1/D2 frequency band increases significantly in the time domain, and the wave pattern characteristics show characteristics that are relatively highly related to the production scheduling optimization algorithm; in the frequency domain, the 24h interference immunity The pressure intensity fluctuates significantly with the freight volume and the trend analysis is basically consistent, showing significant frequency domain uncertainty.
2. MMDS interference
The multi-channel microwave distribution system (MMDS) uses microwave heating frequency to transmit at one point and receive at more points to transmit television, audio broadcast programs and data signals to the front or directly of each cable digital television public antenna television system. Microwave heating system software assigned to individual customers. According to the MMDS transmission configuration in my country, MMDS operating in the 2500-2700MHz frequency range will cause serious interference to the 5G system deployed in the 2.6GHz frequency band. The interference is characterized by several regular continuous 8MHz networks. Bandwidth Rectangular Box Interference Technology Wave Pattern.
The equipment for MMDS transmission and transmission of television programs in the 2500-2700MHz frequency band is shown in Table 1. It can be seen that the MMDS TV programs falling within 2515~2615MHz include the second half of the 2-channel column (4MHz network bandwidth), the 3-14 channel column, etc. When the wave pattern characteristics of a residential area produce several regular and continuous rectangular wave patterns with a bandwidth of 8MHz, you can refer to Table 1 for analysis to determine and go to the station to check the location of the radio and television tower.
3. Video surveillance system interference technology
Video surveillance system interference technology mainly refers to the interference of video surveillance system bridges and wireless network transmission and other facilities on the 5G platform, which belongs to illegal frequency band interference. Nowadays, safety and security monitoring equipment (commonly used in the 2.4GHz frequency band) in residential areas, houses and elevators is widely used. However, the working frequency of relevant equipment is not standardized, and illegal occupation of the 5G frequency band causes interference to 5G. At present, it has been found that some manufacturers' wireless video surveillance equipment causes interference to 5G. The interference characteristics are mostly broadband interference, and the interference intensity is high, mainly concentrated in the 2515~2575MHz range. In addition, video surveillance wireless network transmission equipment is mostly installed in hidden areas such as elevator cars and rooftops. Interference detection is more difficult, and it is necessary to conduct a thorough inspection of common video surveillance installation areas.
1. LTE co-channel interference
In areas where TD-LTE in the D1/D2 frequency band has not been cleared, under long-term load conditions in TD-LTE residential areas, terminal equipment will cause increased co-channel interference in the same covered 5G residential areas, seriously affecting the characteristics of 5G Internet. The strength of LTE co-channel interference is closely related to factors such as the size of the covered area, the wireless network environment, and the traffic volume of LTE adjacent areas.
signal jammer
The main characteristics of LTE co-channel interference are that the 163~273PRB noise floor used in the D1/D2 frequency band increases significantly in the time domain, and the wave pattern characteristics show characteristics that are relatively highly related to the production scheduling optimization algorithm; in the frequency domain, the 24h interference immunity The pressure intensity fluctuates significantly with the freight volume and the trend analysis is basically consistent, showing significant frequency domain uncertainty.
2. MMDS interference
The multi-channel microwave distribution system (MMDS) uses microwave heating frequency to transmit at one point and receive at more points to transmit television, audio broadcast programs and data signals to the front or directly of each cable digital television public antenna television system. Microwave heating system software assigned to individual customers. According to the MMDS transmission configuration in my country, MMDS operating in the 2500-2700MHz frequency range will cause serious interference to the 5G system deployed in the 2.6GHz frequency band. The interference is characterized by several regular continuous 8MHz networks. Bandwidth Rectangular Box Interference Technology Wave Pattern.
The equipment for MMDS transmission and transmission of television programs in the 2500-2700MHz frequency band is shown in Table 1. It can be seen that the MMDS TV programs falling within 2515~2615MHz include the second half of the 2-channel column (4MHz network bandwidth), the 3-14 channel column, etc. When the wave pattern characteristics of a residential area produce several regular and continuous rectangular wave patterns with a bandwidth of 8MHz, you can refer to Table 1 for analysis to determine and go to the station to check the location of the radio and television tower.
3. Video surveillance system interference technology
Video surveillance system interference technology mainly refers to the interference of video surveillance system bridges and wireless network transmission and other facilities on the 5G platform, which belongs to illegal frequency band interference. Nowadays, safety and security monitoring equipment (commonly used in the 2.4GHz frequency band) in residential areas, houses and elevators is widely used. However, the working frequency of relevant equipment is not standardized, and illegal occupation of the 5G frequency band causes interference to 5G. At present, it has been found that some manufacturers' wireless video surveillance equipment causes interference to 5G. The interference characteristics are mostly broadband interference, and the interference intensity is high, mainly concentrated in the 2515~2575MHz range. In addition, video surveillance wireless network transmission equipment is mostly installed in hidden areas such as elevator cars and rooftops. Interference detection is more difficult, and it is necessary to conduct a thorough inspection of common video surveillance installation areas.