Scheduling requests, status reports, and logical channel prioritization
Features, methods, and functions for beam failure recovery and scheduling requests are provided, including methods for triggering, canceling, and transmitting beam recovery requests. The scheduling request may be designed to accommodate new criteria for transmission on a grant-free uplink shared channel (UL-SCH) and for putting the schedule request on hold.
1. An apparatus comprising a processor, a memory, and communication circuitry, the apparatus being connected to a communications network via its communication circuitry, the apparatus further comprising computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform logical channel prioritization for a new transmission by incrementing, as part of the new transmission, a size (Bj) of a prioritized bucket of a Logical Channel (LCHj) by a product of a Prioritized Bit Rate (PBR) of the LCHj times a time interval between consecutive transmission opportunities (DTTI) wherein uplink data transmission with an uplink grant can take place, whether or not data from the LCHj is served at the transmission opportunities.
2. The apparatus of claim 1 , wherein the instructions further cause the apparatus to set Bj to zero when the LCHj is initially established.
3. The apparatus of claim 2 , wherein the instructions further cause the apparatus to, if Bj exceeds a Bucket Size of the LCHj, set Bj equal to the Bucket Size of the LCHj, wherein the Bucket Size of the LCHj is equal to a product of a PBR of the LCHj times a Bucket Size Duration (BSD) of the LCHj.
4. The apparatus of claim 3 , wherein the DTTI of the LCHj is equal to an interval between consecutive data transmission opportunities allowed by the uplink grant.
5. The apparatus of claim 3 , wherein the DTTI of the LCHj is equal to an interval between consecutive data transmission opportunities actually used under the uplink grant.
6. The apparatus of claim 3 , wherein the instructions further cause the apparatus to, determine, based on the uplink grant being within a set of allowable latency parameters, that the LCHj may be served by the uplink grant.
7. The apparatus of claim 6 , wherein the set of allowable latency parameters comprises a maximum latency time and a minimum latency time.
8. The apparatus of claim 7 , wherein the maximum latency time and the minimum latency time are scaled by associated latency factors.
9. The apparatus of claim 8 , wherein the associated latency factors are associated with retransmission numbers.
10. The apparatus of claim 7 , wherein the set of allowable latency parameters further comprises a residual Hybrid Automatic Request (HARQ) operating point.
11. The apparatus of claim 10 , wherein the instructions further cause the apparatus to: compute the residual (HARQ) operating point as a function of a residual Block Error Rate (BLER) and a number of retransmissions for a target BLER.
12. The apparatus of claim 1 , wherein the instructions further cause the apparatus to transmit a Scheduling Request (SR) when (a) a Buffer Status Report (BSR) is triggered and not cancelled and (b) there is no uplink grant, within the allowed latency, available to transmit the BSR.
13. The apparatus of claim 1 , wherein the instructions further cause the apparatus to perform a random access procedure when (a) a Buffer Status Report (BSR) is triggered and not cancelled, (b) there is no Scheduling Request (SR) resource, and (c) there is no uplink grant, within the allowed latency, available to transmit the BSR.
14. The apparatus of claim 1 , wherein the instructions further cause the apparatus to perform random access procedure when (a) a Buffer Status Report (BSR) is triggered and not cancelled, (b) an allowed maximum SR transmission is reached with no uplink grant assigned, and (c) there is no uplink grant available, within the allowed latency, to transmit the BSR.
15. The apparatus of claim 13 , wherein the instructions further cause the apparatus to cancel the random access procedure if either (a) an SR resource becomes available for the transmission of the SR, or (b) an uplink resource for the BSR transmission becomes available before a Random Access Response (RAR) message is received by the apparatus.
16. The apparatus of claim 14 , wherein the instructions further cause the apparatus to cancel the random access procedure if either (a) an SR resource becomes available for the transmission of the SR, or (b) an uplink resource for the BSR transmission becomes available before a Random Access Response (RAR) message is received by the apparatus.
17. An apparatus comprising a processor, a memory, and communication circuitry, the apparatus being connected to a communications network via its communication circuitry, the apparatus further comprising computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to: delay, based on an upcoming uplink grant, a transmission of a scheduling request or a random access channel procedure, wherein the upcoming uplink grant is available for buffer status reporting (BSR).
18. The apparatus of claim 17 , wherein the apparatus delays the random access channel procedure, and the random access channel procedure is a Physical Random Access Channel (PRACH).
19. The apparatus of claim 17 , wherein the instructions further cause the apparatus to: determine, based on logical channel restrictions of the upcoming uplink grant, whether to delay the transmission of the scheduling request or the random access channel procedure.
20. The apparatus of claim 17 , wherein the instructions further cause the apparatus to: maintain a scheduling request restriction timer.