Channel state information feedback design in advanced wireless communication systems

#The present application relates generally to channel state information and, more specifically, to feedback design of channel state information and to the corresponding downlink configuration design in advanced wireless communication systems.

#The following documents and standards descriptions are hereby incorporated into the present disclosure as if fully set forth herein: 1) 3GPP TS 36.211 v11.2.0; 2) 3GPP TS 36.212 v11.2.0; 3) 3GPP TS 36.213 v11.2.0; 4) 3GPP TS 36.331 v11.2.0; 5) R1-125402, 3GPP TS 36.211 CR; and 6) R1-125404, 3GPP TS 36.213 CR. Channel quality indicator (CQI) is defined in section 7.2.3 of 3GPP TS 36.213 v11.2.0. Differential CQI is described in section 7.2 of 3GPP TS 36.213 v11.2.0. A channel state information (CSI) process is described in 3GPP TS 36.331 v11.2.0. Physical uplink control channel (PUCCH) mode 1-1 is described in section 7.2.2 of 3GPP TS 36.213 v11.2.0. PUCCH mode 2-1 is also described in section 7.2.2 of 3GPP TS 36.213 v11.2.0.

#In 3GPP LTE-Advanced standards, wide beam patterns are used for CSI-RS transmissions. The beam (virtualization) patterns of antenna ports are transparent to the user equipment (UEs). The UEs may not know or need to know the virtualization pattern for transmission/reception. A channel coefficient from each CSI reference signal (RS) port to a UE may correspond to a composite response of multiple paths, and is often frequency selective. The UE estimates channel coefficients relying on CSI-RS, and then using the estimated channels to calculate various parameters including precoding matrix indicator (PMI), rank indicator (RI) and CQI (for <=8 CSI-RS ports) or PMI, RI, precoding type indicator (PTI) and CQI (for 8 CSI-RS ports) according to enhanced Node B (eNB) (e.g., base station (BS)) configuration.

#For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts:

#FIG. 1 illustrates an exemplary wireless system which transmits messages in accordance with an illustrative embodiment of the present disclosure;

#FIG. 2 illustrates a high-level diagram of an orthogonal frequency division multiple access transmit path in accordance with an illustrative embodiment of the present disclosure;

#FIGS. 1 through 22, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device.

#FIGS. 1-3 below describe various embodiments implemented in wireless communications systems and with the use of orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication techniques. The description of FIGS. 1-3 is not meant to imply physical or architectural limitations to the manner in which different embodiments may be implemented. Different embodiments of the present disclosure may be implemented in any suitably arranged communications system.

#FIG. 1 illustrates exemplary wireless system 100, which transmits messages according to the principles of the present disclosure. In the illustrated embodiment, wireless system 100 includes transmission points (e.g., eNB, Node B), such as BS 101, BS 102, BS 103, and other similar base stations or relay stations (not shown). Base station 101 is in communication with base station 102 and base station 103. Base station 101 is also in communication with Internet 130 or a similar IP-based system (not shown).