Channel state information and adaptive modulation and coding design for long-term evolution machine type communications

摘要

A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The UE determines CSI. The UE determines whether to send the CSI based on at least one of a timer or a threshold. The UE sends the CSI upon determining to send the CSI. The UE may send the CSI in a MAC header upon determining to send the CSI. When the UE determines whether to send the CSI based on the threshold, the UE may determine whether to send the CSI based on a difference between the CSI and reference CSI. The UE may determine the reference CSI based on at least one of previously reported CSI, fixed CSI, or an MCS of a received data transmission from a base station. The UE may send CSI to the base station in an initial connection setup with the base station.

主权项

1. A method of wireless communication of a user equipment (UE), comprising:
estimating channel state information (CSI) in each of a plurality of subframes; determining the CSI corresponding to a lowest CSI over the plurality of subframes; selecting a random access channel (RACH) format for a RACH procedure based on the determined CSI; determining whether to send a second CSI based on at least one of a timer or a threshold; receiving an uplink grant from a base station, the uplink grant being received when the second CSI is not sent for a time period greater than a second threshold, wherein the second CSI is sent based on the received uplink grant; and sending, in response to determining to send the second CSI, the second CSI in a media access control (MAC) header within a physical uplink shared channel (PUSCH) transmission, wherein the second CSI is sent through the RACH procedure and is indicated through the selected RACH format.