Based On The Wcdma Wireless Access Network Energy Saving Technology Research

Recently, the explosive growth of wireless network users results in a rapidly increase in energy consumption of wireless networks, so reducing the energy consumption of the wireless access network becomes one of the most urgent problems for operators. As high-speed multimedia services increase speediy, the quality of service (QoS) in wireless networks is also required to be improved. How to achieve the energy saving of wireless access network as well as ensure network performance becomes a hot research point for many scholars. This paper focuses on energy consumption issues of wireless access network based on the WCDMA standard, which is widely used in mobile communications.The energy consumption of the wireless access network is mainly from base stations. After researching the existing base station deployment strategies, this paper has proposed an energy saving mechanisms—SNB(switching off Node B), which is switching off the Node B based on the busines’s QoS demanded. Under the premise that not obstruct the session businesses, the mechanism takes QoS requirements of different businesses into account, combines with power control, accept control, congestion control technology to maximize coverage and capacity of the base station, thus reduce the number of demanded active base stations. Then, under a particular network topology and service distribution, a simulation of the mechanism has been carried out. The simulation results show that the energy efficiency of SNB up to25%～51%, but blocking rate increases to2.3%.In order to avoid the shortcomings caused by SNB, the paper introduced another energy-saving mechanism, which is switching off carriers rather than switching the whole Node B when the traffic is low. We call it FDS (Frequency Distribution Scheme). This mechanism is also based on required QoS of each business, while the Node B is not switched off, FDS ensures the sudden traffic’s QoS. According to the traffic curve, FDS can division a day into leisure periods and busy periods automatically by using the volume processing unit. This unit makes FDS applicable in a variety of geographic regions. Then, a frequency distribution unit and a real-time traffic monitoring unit have been introduced to maximize the energy saving of carrier frequency level. Finally, a simulation has been implemented in the same scene of the switching off base station mechanism. Simulation results show that the FDS improves energy efficiency to30%-80%, as well as blocking rate only increases to6.3%. Compared to SNB, FDS has better energy-saving effect though has a litter degenerate in QoS. Thus, FDS is more feasible.