Search space configuration for short transmission time interval

A network node for supporting a predetermined set of one or more aggregation levels for configuration of a downlink control channel for a one of a slot Transmission Time Interval, TTI, and a subslot TTI, the network node comprising processing circuitry configured to:

• determine an aggregation level of the predetermined set of one or more aggregation levels to be monitored by a wireless device, WD, in a communication network;
• determine a number of downlink control channel candidates for the WD to monitor within each of the one of the slot TTI and the subslot TTI, the number of downlink control channel candidates being based upon the aggregation level;
• and
• cause transmission of a configuration to the wireless device indicating the predetermined set of one or more aggregation levels to be monitored by the wireless device, and indicating, for each configured aggregation level to be monitored, the number of downlink control channel candidates for the WD to monitor, the downlink control channel being a short physical downlink control channel, sPDCCH.

A method in a wireless device, WD, for supporting a predetermined set of one or more aggregation levels and for implementing at least one aggregation level and at least one downlink control channel candidate for configuration of a downlink control channel for one of a slot Transmission Time Interval, TTI, and a subslot TTI, the method comprising:

• receiving, from the network node, a configuration indicating the predetermined set of one or more aggregation levels to be monitored by the WD, and indicating, for each configured aggregation level to be monitored, a number of downlink control channel candidates for the WD to monitor;
• receiving, from a network node, an assigned aggregation level of the predetermined set of one or more aggregation levels to be monitored by the WD in a communication network;
• and
• receiving, from the network node, assigned downlink control channel candidates, the network node determining the number of downlink control channel candidates for the WD to monitor within each of the one of the slot TTI and the subslot TTI, the number of downlink control channel candidates being based upon the assigned aggregation level, the downlink control channel being a short physical downlink control channel, sPDCCH.

A wireless device, WD, for supporting a predetermined set of one or more aggregation levels and for implementing at least one aggregation level and at least one downlink control channel candidate for configuration of a downlink control channel for one of a slot Transmission Time Interval, TTI, and a subslot TTI, the WD comprising processing circuitry configured to:

• receive, from the network node, a configuration indicating the predetermined set of one or more aggregation levels to be monitored by the wireless device, and indicating, for each configured aggregation level to be monitored, a number of downlink control channel candidates for the WD to monitor;
• receive, from a network node, an assigned aggregation level of the predetermined set of one or more aggregation levels to be monitored by the WD in a communication network;
• and
• receive, from the network node, assigned downlink control channel candidates, the network node determining the number of downlink control channel candidates for the WD to monitor within each of the one of the slot TTI and the subslot TTI, the number of downlink control channel candidates being based upon the assigned aggregation level, the downlink control channel being a short physical downlink control channel, sPDCCH.