ever, for the global marketplace it is desirable to have such a standard for unlicensed band which can be applied globally and thus it is the intention of 3GPP to develop a solution which will be usable in many regions. There can be some parameterization options which may not be applicable always to all regions but basic functionality is expected to be the same. The use of unlicensed spectrum has typically several regulatory requirements to facilitate the sharing of the band with other technologies as well as to ensure efficient use of spectrum. The European key regulatory requirements can be found from [1]. The following requirements can be identified as being necessary for 3GPP to cover in the design: Requirements for dynamic frequency selection (DFS) for avoiding radars operating in the 5 GHz band. Generally a system operating in the 5 GHz band (known exception being the US upper part of the 5 GHz band) needs to have the ability to detect whether a radar system is using the band (or part of the band). If a radar signal is detected then the band (or part of it) must be vacated within a given time limit. LTE needs only to copy with the detection requirements (and existing test cases which are not technology dependent) and to be able to stop the LTE operation when detection conditions are met but otherwise impacts from such a principle are rather minor for the LTE specification side. For the efficient use of the band there are requirements for minimum bandwidth occupancy. This prevents operating, for example, an LTE in such a way that only 180 kHz would LTE Unlicensed be allocated for a very low data rate transmission. Such an approach would unnecessary block the 20 MHz channel from other users as they would detect the energy level from the narrowband transmission which is not utilizing the full band. The regulation is Europe requires to use at least 80% of the nominal bandwidth but temporary allows going to as low as 4 MHz bandwidth. There has been some discussion to adjust this in Europe due to the needs of IEE