Institute of Electrical & Electronic Engineers
In this paper, the authors examine the energy saving potential of powering down RRC connected but unscheduled User Equipment (UE). The idea is to power down energy consuming circuits in RF and BB, when it is determined by Fast Control Channel Decoding (FCCD) that the UE is not scheduled to receive downlink data in the current TTI. The cost is that some reference signals are not received leading to a degraded channel estimate. Calculations show that this causes an SINR degradation of approximately 0.5 dB, which will result in maximum 4% throughput loss. Comparing this with energy saving potentials of 5 %-25% it is concluded that the FCCD method is a valuable aid to prolong LTE phones' battery lifetime.