Receiving beam selection using hybrid channel based beamforming and codebook based beamforming

US11824616B2 · kind B2 · utility

Assignee

• Apple Inc. · US

Inventors

• Franz J. Eder · Neubiberg, DE
• Adrian Carlos Loch Navarro · Munich, DE
• Andre Janssen · Munich, DE
• Holger Neuhaus · Birkenfeld, DE
• Kenan Kocagoez · Nuremberg, DE

Key dates

• Filing date: Aug 30, 2022
• Grant date: Nov 21, 2023
• Expiry date: Aug 30, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B7/088
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Some aspects relate to apparatuses and methods for selecting a receiving beam based on hybrid channel based beamforming and codebook based beamforming. A user equipment (UE) can determine, based on a first measurement related to signal to noise ratio (SNR) and predetermined threshold values, whether the UE is in a low SNR state. If the UE is in a low SRN state, the UE can derive an estimated channel covariance matrix RCH for channels at a set of antenna elements of the UE based on channel based beamforming (CHBF). Afterwards, a set of test beams {0, . . . Ntest−1} is selected based on the channel covariance matrix RCH, and a set of codebook measurement beams is further selected based on the set of test beams. A receiving beam is selected based on a set of measurements performed on the set of codebook measurement beams at the measurement opportunity for codebook based beamforming (CBBF).