t combinations of HARQ burst sizes and resource sizes that are used by a group. A group facilitates the dynamic link adaptation based on the limited set of MIMO mode, nominal modulation and coding rates, and HARQ data burst sizes. The serving BS configures the MIMO mode set for each group among the predefined candidate sets for downlink and uplink. When an MS is added to the group, the configured Group MIMO Mode Set ID is indicated through Group Configuration MAC control message. The assigned MIMO mode to the MS in the group is chosen from the configured set as shown in Table 6-9. The BS configures a range of nominal Modulation and Coding Schemes (MCS) supported for each group by indicating the highest and lowest MCS values through Group Configuration MAC control message for both downlink and uplink. The allocation size for an MS in the group is determined based on the nominal MCS levels and HARQ burst size. The BS configures a HARQ burst size set for each group among the predetermined HARQ burst size set candidates. Those candidates are signaled to the mobile stations through the broadcast channel. When an MS is added into the group, the configured HARQ Burst Size Set ID is signaled through Group Configuration MAC control message. The assigned HARQ burst size to an MS in the group is chosen from the configured set [2]. The addition of an MS to a group is done when group resource allocation is initialized for the MS, or when an MS in a group moves to another group. The MS must be informed in advance about group 6.10 Scheduling services Table 6-9 DL/UL MIMO Mode Set Candidates for Group Scheduling Constrained Number of MIMO Group MIMO Mode Set Streams Downlink Mode 0 Mode 0, Mode 1 Mode 2 Reserved Uplink Mode 0 Mode 0, Mode 1 Mode 2 Mode 3 information in order to enable the MS to correctly interpret resource assignment information from Group Resource Allocation MAC control message. The information is transmitted through unicast Group Configuration MAC control message. When a BS decides to use group resource alloca