Patent Number: 8,576,692

Title: Transmission of UE-specific reference signal for wireless communication

Abstract: Techniques for transmitting UE-specific reference signals (UE-RSs) in a wireless network are described. In an aspect, a UE-RS may be transmitted in different manners depending on the number of layers used for data transmission. In one design, a cell may determine subcarriers for a UE-RS based on a frequency shift if data is transmitted on one layer and based on a predetermined set of subcarriers (with no frequency shift) if data is transmitted on multiple layers. In another aspect, a UE-RS may be transmitted on subcarriers determined based on a frequency shift for data transmission on multiple layers. In yet another aspect, a UE-RS may be transmitted from a plurality of cells to a UE for coordinated multi-point (CoMP). In yet another aspect, a UE-RS may be transmitted in a data section of a subframe including only the data section.

Inventors: Zhang; Xiaoxia (San Diego, CA), Wei; Yongbin (San Diego, CA), Luo; Tao (San Diego, CA), Doan; Dung Ngoc (San Diego, CA), Yoo; Taesang (San Diego, CA)

Assignee: QUALCOMM Incorporated

International Classification: H04J 11/00 (20060101)

Expiration Date: 1/05/12017