In this paper, three types of cache consistency maintenance strategies involving invalidation reports (IRs) are proposed for application in mobile environments. The three strategies: homogeneous IR, inhomogeneous IR without roaming check, and inhomogeneous IR with roaming check are applied to Timestamp (TS) and Scalable Asynchronous Cache Consistency Scheme (SACCS). Simulation based performance evaluations show that SACCS performs better than TS. Further investigation of SACCS reveals the following two cache system design guidelines: (1) Homogeneous IR strategy should be used for fast intra-roaming mobile users (MUs) and small systems. (2) Inhomogeneous SACCS should be used for inter-roaming MUs while SACCS with roaming check is better if power is not a consideration.