A method of providing a configurable signaling (SIG) field is proposed to reduce the SIG overhead of a data packet in a wireless network. The SIG field comprises both HE-SIG-A field and HE-SIG-A2 field. HE-SIG-A field contains only necessary information for a default network scenario (e.g., indoor non-OFDMA SU-MIMO) to avoid HE-SIG-A2. HE-SIG-A2 field contains OFDMA, MU-MIMO, and/or outdoor parameter settings. By using HE-SIG-A to indicate the existence, mode, and/or length of HE-SIG-A2, the signaling overhead for default scenario can be reduced by avoiding the entire HE-SIG-A2 field. The number of symbols required for HE-SIG-A2 is adjustable based on each transmission scenario and indicated by HE-SIG-A. Further, because higher MCS such as QPSK may be supported for HE-SIG-A2, additional signaling overhead is reduced.