Abstract: Most mobile communications services such as high multimedia are Asymmetric. There is a great difference in their downlink & uplink requirement both in transmitted amount and transmitted rate.This paper discuss asymmetry between uplink and downlink in view of EM radiation, termed as electro-magnetic Asymmetry.The influence of surrounding environment caused by EM radiation is always a serious problem.Also in view of the fact that the wireless resource is limited and to mainly minimise the asymmetry in TDD and to effectively mitigate cross-slot interference an efficient scheme called Demand based slot allocation (DBSA) with reference to TD-SCDMA is proposed. Finally,the simulation result shows that DBSA strategy markedly minimize the Asymmetry leading to human safety and also improves the system performance leading to higher resource utilization.