field of the VHT Capabilities information element is set to ONE. Spatial Stream Underutilization: this field is defined as the percentage of time underutilized by the access point in the spatial domain, for a busy time of the radio channel. Underutilization is calculated only for the primary channel. Wi-Fi Integration to the 4G Mobile Network Observable Secondary 20 MHz Utilization, Observable Secondary 40 MHz Utilization and Observable Secondary 80 MHz Utilization: these fields indicate the load of the secondary radio channels, in conjunction with the measurement of the primary channel. 5.1.1.4. Wide Bandwidth Channel Switch information element The Wide Bandwidth Channel Switch information element is used to switch to a new radio channel. It contains the New Channel Width, New Channel Center Frequency Segment 0 and New Channel Center Frequency Segment 1 fields with the same definition as the VHT Operation information element. 5.1.1.5. Channel Switch Wrapper information element The Channel Switch Wrapper information element indicates characteristics of the cell after switching the radio channel. The Channel Switch Wrapper information element contains the following fields: The New Country field contains the necessary information to enable a mobile to identify the new domain in which it is located. The Wide Bandwidth Channel Switch field is similar to the eponymous information element. 5.1.1.6. VHT Transmit Power Envelope information element The VHT Transmit Power Envelope information element transmits the maximum transmit power for the various bandwidths of the radio channel. 5.1.1.7. Quiet Channel information element The Quiet Channel information element indicates the time interval during which the secondary 80 MHz radio channel must be silent. It also indicates the conditions of use of the 80 MHz primary channel. 5.1.1.8. Operating Mode Notification information element The Operating Mode Notification information element indicates that the access point is modifying the radio channel width and the maximum number o