Option 7 (Set multiple bits SR based on timer/counter parameter)—Normally, a timer and/or counter will increase or decrease based on certain time unit. Possibly, a UE set multiple bits SR based on the time unit. There may be parameters (e.g. 1 slot, 14 OFDM symbols, . . . ) for translate time unit to corresponding numerology and/or TTI. For example, if 1 ms subframe is the time unit of a timer and UE triggers a control element controlled by the timer, the control element will set multiple bits SR to 15 khz numerology.
In case 3, possible options for handling SR triggering for potential new control element are as follows:
Option 1 (Pre-defined rule for UE to set multiple bits SR)—Possibly, UE sets multiple bits SR to default or access numerology when the new control element needs to trigger SR. The default numerology could be default numerology defined in specification for control element to request resource. The default numerology could be numerology used for receiving system information in RRC_IDLE state and/or RRC_INACTIVE state. The default numerology could be different for different UEs (e.g. NB-IoT UE and normal UE may have different default numerologies due to UE capability).
Another possibility could be that UE sets multiple bits SR to the largest or the smallest numerology which the UE can use. The numerology which a UE can use will need to take UE capability into account. In one embodiment, the numerology which a UE can use will also need to take configuration provided from network into account. If the UE does not have a configuration related to certain numerology, the UE may not be able to transmit SR on that numerology even the UE is capable to use. The configuration could be data transmission related configuration.