Methods to handle scheduling requests for ultra-reliable low latency communication (URLLC) in new radio (NR) systems

A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of a User Equipment (UE), the operations to configure the one or more processors to:

• decode an uplink grant for uplink shared channel (UL-SCH) data transmission by the UE;
• if uplink data for a logical channel becomes available to the MAC entity, determine whether to trigger a regular buffer status report (BSR) based at least partly on whether a priority of the logical channel of the uplink data is higher than priorities of other logical channels;
• if the regular BSR is triggered and a logical channel scheduling request (SR) delay timer is not running, and if available UL-SCH data resources do not meet one or more logical channel prioritization (LCP) mapping restrictions configured for the logical channel of the uplink data:
• trigger a scheduling request to request UL-SCH data resources for a new transmission of the uplink data,
• wherein the one or more LCP mapping restrictions are based on:
• a subcarrier spacing index associated to the uplink grant, and
• a physical uplink shared channel (PUSCH) transmission duration associated to the uplink grant.

A user equipment (UE), the comprising:

• one or more memory mediums;
• and
• one or more processors coupled to the one or more memory mediums, wherein the one or more processors are configured to cause the UE to:
• configure a medium access control (MAC) entity for buffer status reporting to provide a Next Generation Node-B (gNB) with information about uplink data volume in the MAC entity;
• decode radio resource control (RRC) signaling from the gNB, wherein the RRC signaling indicates parameters for the buffer status reporting including an indication of one or more logical channels allocated one or more logical channel groups (LCGs);
• and
• decode an uplink grant for uplink shared channel (UL-SCH) transmission by the UE, and
• wherein the MAC entity is configured to:
• trigger a regular buffer status report (BSR) if uplink data for one of the logical channels becomes available to the MAC entity and if the uplink data belongs to a logical channel with a higher priority than a priority of another logical channel containing other available UL data;
• and
• if the regular BSR is triggered, trigger a scheduling request (SR) to request UL-SCH resources for a new transmission of the uplink data if a logical channel scheduling request (SR) delay timer is not running and if available UL-SCH resources do not meet one or more logical channel prioritization (LCP) mapping restrictions configured for the logical channel that triggered the regular BSR, and wherein the one or more memory mediums are configured to store the one or more LCP mapping restrictions configured for the logical channel.