 time is even more difficult as environmental conditions vary during the day and the traffic patterns experienced by the eNodeB can also vary by the time of the day. CHAPTER 3 DEPLOYMENT CHALLENGES IN EVOLVING 4G Note Interference issues and manual tuning for coverage and capacity are discussed in more detail in Chapter 1. The LTE standards have provided for the intercell interference coordination (ICIC) as part of Rel 8 and an improved enhanced ICIC (eICIC) feature as part of Rel 10 for heterogenous networks. Implementing eICIC requires self-organized networks to be implemented, including optimized algorithms to reduce interference. In a traditional macronetwork-based environment, ICIC improves interference only on traffic channels. Enhanced ICIC is dealt with in more detail along with self-organizing networks in Chapter 2. Spectrum Harmonization LTE as a solution has been designed to work with multiple bandwidth options and multiple frequencies. LTE supports 31 operating bands for the paired spectrum (FDD) and 12 operating bands for the unpaired spectrum (TDD). Typically, the bands are allocated to specific frequencies, which are popular in specific countries, such as in the United States and Japan, to help with better acceptance. Although the intention of supporting multiple bands and frequencies and providing for a wide range of supported bandwidths is to make an easier adoption of LTE with enough flexibility to support available bandwidth and frequencies, this definitely imposes problems for the seamless user experience that subscribers may tend to take for granted. A user with a GSM mobile, for example, could comfortably roam across the world without having to worry about compatibility and availability of services. A similar LTE user may not be able to do the same unless her phone supports the multiple bands as part of the services deployed by operators in such territories or countries. We have already encountered issues of users purchasing LTE phones in some countries only to be surprised disappointed that