MU-MIMO SRS Allocation via Lower-Bound User-Speed Filtering

The patent changes the parameter of user selection criteria by introducing speed-based filtering. Users are selected for SRS resource allocation based on their movement speed characteristics - specifically, users with lower speeds (more stable channels) are prioritized for SRS allocation in MU-MIMO systems, while high-speed users are excluded. This parameter change optimizes the trade-off between measurement precision and resource consumption by allocating expensive SRS resources only to users who can effectively utilize them.

The patent applies local quality by differentiating resource allocation strategies based on user characteristics. Instead of uniform allocation to all users or none, the system identifies specific user subsets (those with appropriate speed characteristics) and allocates SRS resources locally to them. This ensures that the limited SRS resources are concentrated on users whose channel conditions are stable enough to provide reliable measurements, thereby maintaining scheduling accuracy while reducing overall resource consumption.

The patent inverts the conventional approach by not excluding high-speed users from MU-MIMO scheduling per se, but rather excluding them from SRS resource allocation. This inversion allows the system to maintain user coverage and adaptability by keeping high-speed users in the MU-MIMO candidate pool, while simultaneously protecting channel state information reliability by denying SRS resources to users whose rapid movement would render measurements unreliable. The inversion resolves the contradiction by separating user eligibility from measurement resource allocation.