Reciprocal channel sounding reference signal multiplexing

US9847862B2 · kind B2 · utility

Assignee

• QUALCOMM Incorporated · US

Inventors

• Joseph Binamira Soriaga · San Diego, US
• Jing Jiang · San Diego, US
• Krishna Kiran Mukkavilli · San Diego, US
• Pavan Kumar Vitthaladevuni · San Diego, US
• Naga Bhushan · San Diego, US
• Tingfang Ji · San Diego, US
• John Edward Smee · San Diego, US

Key dates

• Filing date: Sep 25, 2015
• Grant date: Dec 19, 2017
• Expiry date: Jan 1, 2036

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L5/0051
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Systems and techniques are disclosed to enhance the efficiency of available bandwidth between UEs and base stations. A UE transmits a sounding reference signal (SRS) to the base station. The base station characterizes the uplink channel based on the SRS received and, using reciprocity, applies the channel characterization for the downlink channel. As part of applying the channel information, the base station forms the beam to the UE based on the uplink channel information obtained from the SRS. The UE may include an array of antennas, each UE transmitting a different SRS that the base station receives and uses to characterize the downlink. Multiple UEs (or a single UE with multiple antennas) transmit SRS at the same time and frequency allocation (non-orthogonal), but with each sending its own unique SRS. Further, multiple UEs (or a single UE with multiple antennas) may send their SRS at unique time/frequency allocations (orthogonal).