In March 2006 an IEEE task group was created to for incorporating mobile multihop relay capabilities in the mobile Wimax standard IEEE 802.16e. This group came up with an amendment to the 16e standard which is called 802.16j. This amendment is fully backward compatible. The addition of relay capability does not affect the design of MS unless MS has to exploit some optional features such as receive diversity. The BS needs to change slightly and is called MR-BS to differentiate it from BS with no MMR capabilities.