n value. The 'dominant domain' of a camera phone is the imaging system domain, with potentially all other domains adding complementary domain value. Within the imaging domain, the dominant functionality is image capture (the optical subsystem and sensor array). The 'dominant domain of a games phone is also the imaging domain but the dominant functionality within the domain is, arguably, the display subsystem and associated 2D and 3D rendering engines. The 'dominant domain' of a 'business phone' is the data domain, with the emphasis within the data domain on corporate information management. All other domains are, however, potential value added contributors to the overall system value of the dominant domain. 21.13.2 Dual Dominant-Domain Phones The above examples are reasonably clear cut, but let's take for example an ultralow-cost phone. The dominant domain of an ultralow-cost phone is the wide-area part of the radio sys- tem domain and the voice part of the audio domain plus some parts of other domains (text from the data domain function, possibly basic camera functionality from the imaging do- main). Being pragmatic, it is sensible to describe a ULC phone as a 'dual dominant domain device'. In Chapter 19 we described how Nokia is working on introducing richer functionality to these entry-level devices. Note that they still retain a market volume advantage SO can add functionality more aggressively without necessarily compromising product margins. 21.14 Domain Value Each individual domain has a value and cost. The cost is functional and physical and is a composite of processing load and occupied silicon real estate. Value is a composite of the realised price of the product plus incremental through life revenue contribution as functionality is increased in any one domain. Domain value is independent of partitioning or integration. Presently, individual domains may be on separate interconnected devices. For example, in the radio domain, Bluetooth has been historically separate from the mobile broadband RF and baseb