Interference in 5G

Receiver sensitivity?is the minimum power level at which the receiving node is able to clearly receive the bits being transmitted. This is measured in dBm. To simplify, if the distance between nodes results in a loss of transmit power that falls below the receiver sensitivity, amplification somewhere in the path to the receiver would be required to boost the signal above this threshold.

The device sensitivity for LTE or NR would degrade if certain interferences exist.

Dual connectivity deployments utilize various frequencies which may lead to unwanted interference issues. overall, there are three main types of interference which are caused by simultaneous UL Transmission on different bands and this may have negative impacts on NR, LTE and other non-3gpp access such as Wifi, bluetooth or even GNSS.

Various scenarios have been studied by 3GPP, for example LTE UL interference on NR DL or harmonic mixing of uplink stream of NR with DL of LTE. The combination of various frequency bands and associated intermodulation and interference results and affected systems are studied by 3GPP in below Technical reports:

As an example below table from TR 37.865-01-01?illustrates Reference sensitivity exceptions due to harmonic mixing for EN-DC in NR FR1 on n78 and n41 bands.

Interference caused by TDD coexistence

Synchronisation of 5G TDD mobile networks seems crucial as adjacent networks may interfere each other if not planned by considering legacy LTE TDD networks. Synchronisation refer to parameters that make sure adjacent networks send and receive data from mobile or fixed devices at the same time, in order to avoid interference.?there is a list of recommendations by GSMA on this at below link.

#5G #Interference #LTE #TDD