For a wireless network design that includes voice capability and location services in a carpeted office space, it is crucial to ensure proper coverage and overlap. For voice capability, continuous coverage with a signal strength of -67 dBm or better is necessary to support seamless roaming and maintain call quality. Therefore, continuous -67 dBm coverage from one access point is essential. For location services, overlapping coverage from three access points at -67 dBm or better is required to accurately triangulate the position of devices. Therefore, overlapping -67 dBm coverage from three access points is essential.

The target value for the cell edge reading in a VoWLAN survey is -67 dBm. This value ensures an adequate signal strength that compensates for potential noise and provides a stable and quality voice connection. The recommended value aligns with industry standards, which generally suggest -67 dBm for VoWLAN to ensure good voice quality and reliable connectivity.