Radio Base Station Link Adaptation via User Group Segmentation

The patent segments user terminals into multiple user groups based on channel gain conditions. Instead of performing exhaustive search across all possible user sets, the system only needs to determine one user set from each segmented group. This segmentation dramatically reduces the calculation complexity while maintaining link adaptation accuracy, as the search space is divided into manageable segments rather than treating all users as a single complex set.

The patent changes the parameter of transmission power from dynamic per-user control to fixed values assigned to different user groups. By categorizing users into groups with similar channel characteristics and assigning fixed power levels to each group, the system reduces power control fluctuations and simplifies the control mechanism while still achieving effective link adaptation across different channel conditions.

The patent applies segmentation by dividing the user population into multiple user groups based on channel gain thresholds. Instead of performing exhaustive search over all possible user combinations, the system performs simplified selection within each segmented group. This maintains user set optimization quality while reducing computational load from exponential complexity to linear or polynomial complexity relative to the number of user groups.

The patent performs preliminary classification of users into groups based on channel gain conditions before the actual user set selection process. This preliminary action organizes users in a way that facilitates efficient selection, avoiding the need for exhaustive search. The pre-grouping step transforms an intractable optimization problem into a series of simpler selection tasks that can be completed with minimal computational effort.

The patent changes the transmission power parameter from frequent dynamic adjustments to fixed values assigned to user groups. Each user group is associated with a specific transmission power level that remains stable as long as users remain in that group. This approach maintains channel adaptation capability through group-based power assignment while significantly improving power control stability by eliminating frequent power fluctuations that would occur with per-user dynamic control.

The patent performs preliminary assignment of fixed transmission power values to each user group based on channel gain characteristics. This preliminary power assignment remains in effect until users transition between groups, providing stable power control. The preliminary action of grouping users by channel conditions ensures that power adjustments only occur when necessary (during group transitions) rather than continuously, thereby stabilizing power control while maintaining adaptability.