Method and apparatus for transmitting csi on the pusch in an lte system

Abstract

The present invention relates to allowing configuring CSI reporting (step S- 224, 310 ) on radio resources that are allocated over a plurality of sub frames on Physical Uplink Shared Channel (PUSCH). Allocation of said radio resources (steps S- 202, 404 ) can be performed by semi-persistent allocation or by using Transmission Time Interval (TTI) bundling. By using either semi-persistent scheduling or TTI-bundling as decided by an eNB ( 104, 204, 600 ) the UE ( 102, 202, 500 ) can be configured to report CSI (step S- 224, 310 ) for a plurality of UL transmissions. By allocating radio resources by using semi-persistent scheduling, the signaling overhead, which can be substantial for dynamic scheduling of radio resources, decreases. By using TTI-bundling the coverage of the CSI-reports increases.

1 . A method in a base station for configuring reporting Channel Status Indicator, CSI, of a User Equipment, UE, on a Physical Uplink Shared Channel, PUSCH, comprising the steps of:
 allocating uplink radio resources spanning over at least two sub frames to the UE by using an allocation method,   providing information of the resource allocation to the UE, and   providing at least an indication to the UE of a request for reporting CSI on PUSCH in at least one UL transmission for which the allocation is valid.