he website. Increasing Capacity of a Base Station Increasing Capacity of a Base Station We can consider using higher-gain antennas. This has the advantage of increasing the radio signal path gain in both forward and reverse directions. However, the hori- zontal radiation pattern is already determined by the sector angle. Making the angle narrower means adding more sectors (described in Sec. 41.4), which is a more costly proposition. Most of the initial base station designs probably use the highest-gain an- tennas consistent with CDMA air-interface performance, so using higher-gain anten- nas is unlikely to be a major design option to improve the radio path. Once we have decided that the system is limited in the forward direction, and once we have determined that more power is an option we can use, we look at the distribu- tion of amplifier power to see if more power will help. If our capacity crunch is in a green area, where the limit is available bits, then adding power will not help at all. More power will not increase capacity, and user terminals in this area already have more than adequate coverage. While more power will reach more subscribers in red ar- eas and improve system coverage, it will not relieve a capacity problem in doing SO. It is only a capacity problem in a yellow area that will be relieved by adding more forward transmit power, and only if there is sufficient user terminal transmit power in the re- verse direction. We can learn about the distribution of subscribers from the distribu- tion of forward transmit power. If the forward amplifier is spending time operating at over half power, then we have a need for capacity increase. It is the distribution of power during the rest of the time that tells us if the capacity need is in green areas, where more power will not help, or in yellow areas, where more power will directly increase the CDMA capacity of the base station. If the amplifier is spending most of its time at very low power levels, then we conclude that the demand we are trying to serve