Signaling to indicate locations of dedicated random access channel region in time domain
Methods, systems, and devices for wireless communications are described. A node (e.g., a base station or network entity) may identify a signal that provides an indication of a location of a contention free random access channel (CFRA) resource within a time region and an indication of a timing pattern for the CFRA resource, the timing pattern associated with a pattern of subsequent instances of the time region in which the CFRA resource is repeated, wherein the CFRA resource is not a fully overlapping resource with respect to a contention based random access (CBRA) resource. The node may convey the signal to one or more user equipment (UE) to indicate the location and the timing pattern.
1. A wireless communication node, comprising:
one or more processors configured to generate a signal indicating a contention free random access (CFRA) resource and indicating a number of actually transmitted synchronization signal block (SSB) signals, wherein:
the CFRA resource is based at least in part on the actually transmitted SSB signals and is partially overlapping and not fully overlapping in time with respect to a contention based random access (CBRA) resource,
the signal comprises an indication of a timing pattern for the CFRA resource,
the timing pattern is associated with a pattern of subsequent instances of a time region in which the CFRA resource is repeated, and
the signal indicates a physical random access channel (PRACH) configuration index to provide the indication of the timing pattern for the CFRA resource;
a transmitter configured to transmit the signal to indicate the timing pattern using a first radio access technology (RAT); and
a receiver configured to receive, during at least one instance of the CFRA resource, a random access channel (RACH) transmission using a second RAT, the second RAT being different from the first RAT.
2. The wireless communication node of claim 1 , wherein the timing pattern comprises at least one of a periodic pattern or an aperiodic pattern.
3. The wireless communication node of claim 1 , wherein the one or more processors are configured to identify one or more symbols within the time region in which the CFRA resource occurs, wherein a location of the CFRA resource is based at least in part on the one or more symbols.
4. The wireless communication node of claim 3 , wherein the location comprises a starting symbol of the CFRA resource.
5. The wireless communication node of claim 3 , wherein the location of the CFRA resource comprises a symbol within a slot, a slot within a subframe, a subframe within a radio frame, a radio frame within a set of radio frames, or a combination thereof.
6. The wireless communication node of claim 1 , wherein the time region comprises a frame, a subframe, a slot, a mini-slot, or a combination thereof.
7. The wireless communication node of claim 1 , wherein the one or more processors are configured to identify a subset of time regions from a set of time regions, each time region of the subset of time regions comprising one or more instances of the CFRA resource, and wherein the timing pattern for the CFRA resource is based at least in part on the subset of time regions.
8. The wireless communication node of claim 1 , wherein the signal is transmitted in a first radio frequency spectrum band and the RACH transmission is received in a second radio frequency spectrum band, the second radio frequency spectrum band being different from the first radio frequency spectrum band.
9. A method for wireless communication at a node, comprising:
generating a signal indicating a contention free random access (CFRA) resource and indicating a number of actually transmitted synchronization signal block (SSB) signals, wherein:
the CFRA resource is based at least in part on the actually transmitted SSB signals and is partially overlapping and not fully overlapping in time with respect to a contention based random access (CBRA) resource,
the signal comprises an indication of a timing pattern for the CFRA resource, the timing pattern is associated with a pattern of subsequent instances of a time region in which the CFRA resource is repeated, and
the signal indicates a physical random access channel (PRACH) configuration index to provide the indication of the timing pattern for the CFRA resource;
transmitting the signal to indicate the timing pattern using a first radio access technology (RAT); and
receiving, during at least one instance of the CFRA resource, a random access channel (RACH) transmission using a second RAT, the second RAT being different from the first RAT.
10. The method of claim 9 , wherein the timing pattern comprises at least one of a periodic pattern or an aperiodic pattern.
11. The method of claim 9 , further comprising:
identifying one or more symbols within the time region in which the CFRA resource occurs, wherein a location of the CFRA resource is based at least in part on the one or more symbols.
12. The method of claim 11 , wherein the location comprises a starting symbol of the CFRA resource.
13. The method of claim 11 , wherein the location of the CFRA resource comprises a symbol within a slot, a slot within a subframe, a subframe within a radio frame, a radio frame within a set of radio frames, or a combination thereof.
14. The method of claim 9 , wherein the time region comprises a frame, a subframe, a slot, a mini-slot, or a combination thereof.
15. The method of claim 9 , further comprising:
identifying a subset of time regions from a set of time regions, each time region of the subset of time regions comprising one or more instances of the CFRA resource, and wherein the timing pattern for the CFRA resource is based at least in part on the subset of time regions.
16. The method of claim 9 , wherein the signal is transmitted in a first radio frequency spectrum band and the RACH transmission is received in a second radio frequency spectrum band, the second radio frequency spectrum band being different from the first radio frequency spectrum band.
17. An apparatus for wireless communication, comprising:
one or more processors;
one or more memories in electronic communication with the one or more processors; and
instructions stored in the one or more memories and operable, when executed by the one or more processors, to cause the apparatus to:
generate a signal indicating a contention free random access (CFRA) resource and indicating a number of actually transmitted synchronization signal block (SSB) signals, wherein:
the CFRA resource is based at least in part on the actually transmitted SSB signals and is partially overlapping and not fully overlapping in time with respect to a contention based random access (CBRA) resource,
the signal comprises an indication of a timing pattern for the CFRA resource, the timing pattern is associated with a pattern of subsequent instances of a time region in which the CFRA resource is repeated, and
the signal indicates a physical random access channel (PRACH) configuration index to provide the indication of the timing pattern for the CFRA resource;
transmit the signal to indicate the timing pattern using a first radio access technology (RAT); and
receive, during at least one instance of the CFRA resource, a random access channel (RACH) transmission using a second RAT, the second RAT being different from the first RAT.
18. The apparatus of claim 17 , wherein the instructions are further executable by the one or more processors to:
identify one or more symbols within the time region in which the CFRA resource occurs, wherein a location of the CFRA resource is based at least in part on the one or more symbols.