Parameterized codebook subsets for use with precoding MIMO transmissions

US8767681B2 · kind B2 · utility

Assignee

• Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

• David Hammarwall · Stockholm, SE
• George Jöngren · Sundbyberg, SE

Key dates

• Filing date: Apr 6, 2011
• Grant date: Jul 1, 2014
• Expiry date: Jun 12, 2032

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B7/10
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

One aspect of the teachings presented herein provides advantages for sending precoder selection feedback from a transceiver to another transceiver, for use by the other transceiver as precoding recommendations. The transceiver generates two types of precoder selection feedback, where one type uses a smaller signaling payload than the other and therefore provides a distinct reduction in the signaling overhead associated with reporting precoding recommendations. The transceiver uses the reduced-overhead type of reporting when reporting at certain times, or on certain channels, or in response to control signaling. In one example, a UE in an LTE network sends precoder information to an eNodeB on the PUCCH by sending smaller-range index values that index only a subset of precoders, but sends full-range index values when reporting on the PUSCH, which index a larger set of precoders.