Timing determination techniques for 5G radio access network cells
Timing determination techniques for 5G radio access network cells are described. According to various such techniques, during a random access procedure in a 5G cell, user equipment (UE) may determine slot offset values applicable to various transmissions associated with the random access procedure using procedures that do not rely on UE-specific radio resource control (RRC) signaling. According to some such techniques, during system information acquisition in a 5G cell, a UE may determine applicable slot offset values for one or more system information block (SIB) transmissions using procedures that do not rely on UE-specific radio resource control (RRC) signaling. Other embodiments are described and claimed.
1. A baseband processor for user equipment (UE), comprising:
a memory, and
processing circuitry configured to:
detect downlink control information (DCI) scheduling a downlink (DL) data transmission of a next generation node B (gNB) during a random access procedure in a next generation radio access network (NG-RAN) cell;
identify an applicable slot offset value based on information comprised in the DCI indicating a number of slots by which a slot containing the DCI scheduling precedes the DL data transmission, and identify one of a plurality of values in a value set as the applicable slot offset value based on the information comprised in the DCI;
identify a scheduled slot for the DL data transmission based on:
a slot of receipt of the DCI; and
the applicable slot offset value; and
access a DL wireless channel of the NG-RAN cell during the scheduled slot to receive the DL data transmission;
wherein the applicable slot offset value in the value set comprises a delay value;
wherein the applicable slot offset value is identified by adding the delay value to a base value; and
wherein the base value is indicated in a system information block (SIB) for the NG-RAN cell.
2. The baseband processor of claim 1 , wherein the processing circuitry is further configured to identify the applicable slot offset value based on
information comprised in the SIB for the NG-RAN cell.
3. The baseband processor of claim 1 , wherein the processing circuitry is further configured to identify the applicable slot offset value based on one or both of:
an identity of a physical random access channel (PRACH) resource used for transmission of a random access preamble during the random access procedure;
an identity of a physical downlink control channel (PDCCH) resource used for transmission of the DCI.
4. The baseband processor of claim 1 , wherein when PRACH resource sets are defined, the base value is indicated by being specific to one of the PRACH resource sets.
5. A baseband processor for a user equipment (UE), comprising:
a memory, and
processing circuitry configured to:
detect receipt, from a next generation node B (gNB), of a grant of resources for an uplink (UL) data transmission in a random access response (RAR) message during a random access procedure in a next generation radio access network (NG-RAN) cell;
identify a scheduled slot for the UL data transmission based on a slot of receipt of the grant and an applicable slot offset value indicating a number of slots by which the slot of receipt of the grant precedes the scheduled slot, and identify one of a plurality of values in a value set as the applicable slot offset value based on an indicator comprised in a same downlink (DL) transmission as the grant; and
encode data comprising a radio resource control (RRC) message for transmission over a physical uplink shared channel (PUSCH) of the NG-RAN cell during the scheduled slot;
wherein the applicable slot offset value in the value set comprises a delay value;
wherein the applicable slot offset value is identified by adding the delay value to a base value; and
wherein the base value is indicated in a system information block (SIB) for the NG-RAN cell.
6. The baseband processor of claim 5 , wherein the grant is comprised in a random access response message received from the gNB via a physical downlink shared channel (PDSCH) of the NG-RAN cell.
7. The baseband processor of claim 5 , wherein the grant is comprised in downlink control information (DCI) received from the gNB via a physical downlink control channel (PDCCH) of the NG-RAN cell.
8. The baseband processor of claim 5 , wherein the delay value is based on information comprised in the same downlink (DL) transmission as the grant.
9. The baseband processor of claim 5 , wherein the processing circuitry is further configured to identify the applicable slot offset value based on
information comprised in a system information block (SIB) the SIB for the NG-RAN cell.
10. The baseband processor of claim 5 , wherein the processing circuitry is further configured to identify the applicable slot offset value based on an identity of a physical random access channel (PRACH) resource used for transmission of a random access preamble during the random access procedure.
11. The baseband processor of claim 5 , wherein when PRACH resource sets are defined, the base value is indicated by being specific to one of the PRACH resource sets.
12. At least one non-transitory computer-readable storage medium having stored thereon instructions that, when executed by processing circuitry of user equipment (UE), cause the UE to:
transmit a random access preamble to initiate a random access procedure in a next generation radio access network (NG-RAN) cell;
detect downlink control information (DCI) scheduling a downlink (DL) data transmission over a wireless channel of the NG-RAN cell during the random access procedure;
identify a scheduled slot for the DL data transmission based on a slot of receipt of the DCI and a slot offset value indicating a number of slots by which the slot of receipt of the DCI precedes the scheduled slot applicable to the DL data transmission, wherein the instructions, when executed, cause the UE to identify one of a plurality of values in a value set as an applicable slot offset value based on information comprised in the DCI; and
access the wireless channel during the scheduled slot;
wherein the applicable slot offset value in the value set comprises a delay value;
wherein the applicable slot offset value is identified by adding the delay value to a base value; and
wherein the base value is indicated in a system information block (SIB) for the NG-RAN cell.
13. The at least one non-transitory computer-readable storage medium of claim 12 , having stored thereon instructions that, when executed by processing circuitry of the UE, cause the UE to identify the applicable slot offset value based on
information comprised in the SIB for the NG-RAN cell.
14. The at least one non-transitory computer-readable storage medium of claim 12 , having stored thereon instructions that, when executed by processing circuitry of the UE, cause the UE to identify the applicable slot offset value based on one or both of:
an identity of a physical random access channel (PRACH) resource used for transmission of a random access preamble during the random access procedure; and
an identity of a physical downlink control channel (PDCCH) resource used for transmission of the DCI.
15. The at least one non-transitory computer-readable storage medium of claim 12 , the data transmission to comprise a downlink (DL) transmission over a physical downlink shared channel (PDSCH) of data comprising a random access response message or a contention resolution message.
16. The at least one non-transitory computer-readable storage medium of claim 12 , wherein when PRACH resource sets are defined, the base value is indicated by being specific to one of the PRACH resource sets.