Csi-based precoding in search space subset

A wireless device for decoding a transmission, the wireless device comprising:

• one or more processors;
• and
• memory comprising instructions to cause the wireless device to:
• determine a plurality of Machine-Type Communications, MTC, Physical Downlink Control Channel, MPDCCH, transmission candidates to monitor;
• for at least one candidate of the plurality of MPDCCH transmission candidates, determine whether the candidate belongs to a first group of candidates or a second group of candidates where the first group of candidates comprises a first subset of a first search space and the second group of candidates comprises the combination of a second search space and a second subset of the first search space, where the second subset is the complement of the first subset and the first search space comprises a User Equipment, UE,-specific search space and the second search space comprises a Type 0-MPDCCH common search space;
• if the candidate belongs to the first group of candidates, attempt to decode the MPDCCH transmission using a Channel State Information, CSI,-based precoding scheme;
• and
• if the candidate belongs to the second group of candidates, attempt to decode the MPDCCH transmission using a predetermined precoding scheme.

A base station for encoding a transmission, the base station comprising:

• one or more processors;
• and
• memory comprising instructions to cause the translator node to:
• determine whether to encode a Machine-Type Communications, MTC, Physical Downlink Control Channel, MPDCCH, transmission to a wireless device using a Channel State Information, CSI,-based precoding scheme or a predetermined precoding scheme;
• if using the CSI-based precoding scheme, choose a candidate for transmission from a first group of candidates where the first group of candidates comprises a first subset of a first search space and the first search space comprises a UE-specific search space;
• if using the predetermined precoding scheme, choose a candidate for transmission from a second group of candidates where the second group of candidates comprises the combination of a second search space and a second subset of the first search space, where the second subset is the complement of the first subset and the second search space comprises a Type 0-MPDCCH common search space.