Sangkyu Baek Bong Dae Choi Performance Analysis of Power Saving Class of Type 1 with Both Downlink and Uplink Traffics in IEEE 802.16e. 196-209 2009 MOBILIGHT http://dx.doi.org/10.1007/978-3-642-03819-8_19 conf/mobilight/2009 db/conf/mobilight/mobilight2009.html#BaekC09