Meta Platforms, Inc.

Facebook, Inc.

Luminate Wireless, Inc.

Brett Eric Schein

Djordje Tujkovic

Krishna Srikanth Gomadam

Po Han Huang

Praveen Kumar Gopala

Mustafa Emin Sahin

Amit Butala

Brian Dunn

Anoop Singh Tomar

Michel Ouellette

In one embodiment, a method includes sending SRS received from a plurality of UEs associated with the base station to a DU associated with the base station, receiving information regarding a subset of the plurality of UEs selected for downlink data transmissions for an RBG, multi-user data to be transmitted to UEs in the subset, and identities of selected beams among a plurality of pre-determined beams to be associated with the UEs in the subset from the DU, where each of the plurality of pre-determined beams corresponds to a DFT vector, computing a precoding matrix for the RBG based on IDFT vectors corresponding to the selected beams, preparing pre-coded multi-user data by applying the precoding matrix to the multi-user data, and transmitting the pre-coded multi-user data to the UEs in the subset for the RBG using MIMO technologies.

User grouping for multi-user MIMO

In one embodiment, a method includes receiving SRS received from a plurality of UEs associated with the base station from an RU associated with the base station, estimating strengths or signal-to-noise ratios (SNRs) for pre-determined beams for each of the plurality of UEs based on the received SRS, selecting a subset of the plurality of UEs to which downlink data is to be transmitted for a RBG in a TTI based on the estimated strengths or SNRs of the pre-determined beams for the plurality of UEs, computing a precoding matrix for the RBG based on the selected subset, preparing multi-layered UE data for the RBG based on the selected subset and the computed precoding matrix, sending the multi-layered UE data and the precoding matrix for the RBG to the RU, where the RU transmits pre-coded multi-layered UE data to the UEs in the subset using MIMO technologies.

Hybrid user selection and beamforming method for multi-user MIMO

Apparatuses, methods, and systems for a network-based clock for time distribution across a wireless network, are disclosed. One system includes a network that includes a time distributor, a time receiver, and a plurality of network elements providing one or more network connections between the time distributor and the time receiver. The plurality of network elements includes an ingress network element and an egress network element. The time distributor receives and synchronizes to a first clock. Two or more of the plurality of network elements receives and synchronize to a second clock. A forward network transit delay is determined between the ingress network element and the egress network element and a backward network transit delay is determined between the egress network element and the ingress network element. The time receiver time synchronizes to the time distributor using the forward network transit delay and the backward network transit delay.

Network-based clock for time distribution across a wireless network

Methods and apparatus for mitigating interference which are well suited for high density deployments of small base stations are described. In various embodiments, control channel resources are intentionally not fully utilized. A control channel resource utilization parameter is set, e.g., as a function of interference, to limit base station average transmission power used for transmitting signals on control channel resources. By controlling utilization of control channel resources, e.g., by limiting resource utilization to result in a lower than possible, e.g., permitted, average transmission power level, the base station constrains the amount of interference to other nearby devices, e.g., base stations and UE devices. Nearby base stations operate and/or are controlled in a similar manner. As a result, nearby base stations which are causing interference to one another will reduce inter-base station interference. The restriction on resource utilization in some embodiments is increased as the amount of interference between base stations increases.

Wireless channel interference mitigation methods and apparatus

Growing community of inventors

Mountain View, CA, United States of America

Brett Eric Schein