Disclosed herein is a process for vapor phase growth of gallium nitride compound semiconductor which yields uniform crystal layers with good reproducibility. Cell capacity is increased by using two antennas for each sector corresponding to two subsectors with each using a subset of the CDMA codes defined for the sector and with each subset including a pilot channel. The system identifies mobile devices that have an ongoing connection session) with the identified access points, in part by maintaining and accessing a look-up table containing location information for the access point and connected mobile devices. The cached object representation associates an object with a supplier identity and a supplier trust property. In response to a request by the host processor to boot the second CPU, the first CPU is configured to execute secure booting of the second CPU by decrypting encrypted code to generate decrypted code executable by the second CPU but that is inaccessible by the host processor.