 attenuation factors, indoor and deep indoor coverage always suffer signal degradation. Therefore specific indoor solutions are planned. A distributed antenna system is generally used to deploy a wide coverage by means of a single transmitter. The principle is to feed a large number of antennas through a network of feeders, splitters and couplers. Splitters divide an input signal into two or more equal signals while couplers distribute an input signal unevenly on different output branches. Generally, the use of active elements such as boosters to pump the power is not needed. Therefore passive solutions are discussed. Capacity Enhancement Radio Channel Allocation Techniques To increase the capacity of the system, the first step is to optimise the use of resources. Directed Re-try This is a useful feature used to distribute traffic load at the call setup. It is a kind of SDCCH to TCH handover where the communication is initiated on the SDCCH of a loaded cell and the call is then handed Radio Network Optimisation out to the TCH of an adjacent cell that is less loaded. It is possible to tune and rule the algorithm according to defined parameters. Load Sharing This solution is useful during the call. In fact, calls belonging to a loaded cell and initiated by mobiles at the edge of the cell are handed out to less loaded neighbours. Queuing Enabling queuing is an efficient way to improve the satisfaction of the end user by letting the call attempt wait by some milliseconds till the system is freed. All capacity enhancement features can be used simultaneously. This gives a possibility to combine the benefits of several solutions and multiply capacity gain. Means to Limit Interference Influence Multiplied interference in a system also impacts the capacity. Discontinuous Transmission The aim is to stop emitting in periods of silence, either from the mobile side or the base station side. It allows interference to be reduced on other communications. It can be performed either in the downlink or uplink. Frequency Hopping Fre