economy could not and probably cannot be achieved. 15.8 Impact of Global Spectral Policy and Related Implications for Receiver Design and Signal Flux Levels Global spectral policy is set every five years at the World Radio Congress, the next one, when this book was written, being WRC 2012. Five years earlier WRC07 produced policy on the following areas: The extension of Digital Radio Mondiale from long wave, medium wave and short wave to include the FM broadcast bands. The extension of the present T-DAB/DMB multiplex in Band 111 to include 160 kbit en- hanced audio transmissions and related European digital TV and DMB deployments. Agreement on additional HDD broadcast DTT DVB UHF transmissions and additional DVB H multiplex options. Finalised plans for allocating and auctioning 112 MHz of UHF between 470 and 862 MHz for cellular FDD transmission. Agreement on L band allocations between 1452 and 1492 MHz including potential DAB extensions and cellular FDD or TDD opportunities. Terrestrial Broadcast/Cellular Network Integration The repurposing of S Band for DVB -SH and related hybrid satellite and terrestrial broadcast delivery options. International agreement on the 2.5-GHz cellular extension band from 2500 to 2690 MHz. The emphasis was on producing harmonised band allocations that could deliver sufficient economies of scale to support new cost- and performance-competitive cellular transceivers with integrated broadcast receive capabilities. Some of this spectrum was made available at the expense of present users, including broadcasting and programme making and special events (radio microphones and professional wireless cameras). The repurposing of this spectrum therefore implied significant engineering challenges and related business transition management opportunities. The repurposing of the upper end of the TV bands for mobile broadband has proved particularly problematic both technically and commercially. The difficulty revolves around the risk of hole punching. Hole punching is when a TV receiver is unable to