Telecom regulator TRAI on Friday said that it has been receiving a number of call drop complaints from subscribers triggering the need to review existing quality of service rules to measure network performance at the district level and bring 4G-5G services also under its ambit. 

source https://www.gadgets360.com/telecom/news/trai-reports-rise-call-drops-complaint-begins-service-quality-rules-review-4310339#rss-gadgets-all