Time-domain table for PUSCH and Msg3
A User Equipment (UE) for a cellular communications system receives a Random Access Response (RAR) message comprising an indication of a time-domain resource allocation for a Msg3 transmission on a Physical Uplink Shared Channel (PUSCH), and determines a slot offset value, K2, for the Msg3 transmission based on the indication of the time-domain resource allocation and a PUSCH table. UE adds an additional slot offset value for the Msg3 transmission to the slot offset value, K2, to provide an increased slot offset value for the Msg3, and transmits the Msg3 transmission in accordance with the increased slot offset value.
1. A method implemented in a User Equipment, UE, for a cellular communications system, comprising:
receiving a Random Access Response, RAR, message comprising an indication of a time-domain resource allocation for a Msg3 transmission on a Physical Uplink Shared Channel, PUSCH;
determining a slot offset value, K2, for the Msg3 transmission based on the indication of the time-domain resource allocation and a PUSCH table; and
transmitting the Msg3 transmission in accordance with an increased slot offset value that corresponds to a sum of the slot offset value, K2, and an additional slot offset value,
wherein the additional slot offset value varies in relation to an amount of processing time allocated for RAR message decoding after Physical Downlink Control Channel, PDCCH, decoding.
2. The method of claim 1 wherein the additional slot offset value corresponds to a subcarrier spacing of the PUSCH.
3. The method of claim 1 wherein the PUSCH table is configured via system information or higher layer signaling.
4. The method of claim 1 wherein the additional slot offset value varies in relation to an additional processing time needed for RAR message decoding compared to Physical Downlink Control Channel, PDCCH, decoding and rounded to a next higher number of slots in an uplink numerology of the PUSCH.
5. The method of claim 4 wherein:
the additional slot offset value is defined in accordance with:
additional_slot
_offset
=
⌈
T
add
T
UL
,
slot
⌉
·
T
UL
,
slot
where T add denotes the additional processing time and T UL,slot denotes a duration of an uplink slot for the uplink numerology of the PUSCH; and
the increased slot offset value is:
K 2,increased =K 2 +additional_slot_offset
where K 2,increased denotes the increased slot offset value and K 2 denotes the slot offset value, K2, comprised in the time-domain resource allocation.
6. The method of claim 4 wherein the additional processing time, T add , is:
T add =N 1 ·(2048+144)·κ·2 −μ UL ·T c +0.5 ms
where N 1 is a Physical Downlink Shared Channel, PDSCH, decoding time, κ=64, μ UL is the uplink numerology of the PUSCH, and T c =1/(4096·480e3).
7. The method of claim 4 wherein the additional processing time is a function of whether the RAR message is transmitted in a short Physical Downlink Shared Channel, PDSCH, with mapping Type A.
8. The method of claim 4 wherein the RAR message is transmitted in a short Physical Downlink Shared Channel, PDSCH, with mapping Type A that stops in an i-th symbol, and the additional processing time, T add , is:
T add =( N 1 +d 1,3 )·(2048+144)·κ·2 −μ UL ·T c +0.5 ms
where N 1 is a Physical Downlink Shared Channel, PDSCH, decoding time, κ=64, μ UL is the uplink numerology of the PUSCH, T c =1/(4096·480e3), and d 1,3 is:
d
1
,
3
=
{
7
-
i
if
i
<
7
0
otherwise
.
9. The method of claim 1 wherein the additional slot offset value varies in relation to an additional processing time needed for RAR message decoding compared to Physical Downlink Control Channel, PDCCH, decoding and rounded to a next lower number of slots in an uplink numerology of the PUSCH.
10. A User Equipment, UE, for a cellular communications system, comprising:
an interface comprising radio front end circuitry and one or more antennas; and
processing circuitry associated with the interface, the processing circuitry operable to cause the UE to:
receive a Random Access Response, RAR, message comprising an indication of a time-domain resource allocation for a Msg3 transmission on a Physical Uplink Shared Channel, PUSCH;
determine a slot offset value, K2, for the Msg3 transmission based on the indication of the time-domain resource allocation and a PUSCH table; and
transmit the Msg3 transmission in accordance with an increased slot offset value that corresponds to a sum of the slot offset value, K2, and an additional slot offset value,
wherein the additional slot offset value varies in relation to an amount of processing time allocated for RAR message decoding after Physical Downlink Control Channel, PDCCH, decoding.
11. The UE of claim 10 wherein the additional slot offset value corresponds to a subcarrier spacing of the PUSCH.
12. The UE of claim 10 wherein the PUSCH table is configured via system information or higher layer signaling.
13. The UE of claim 10 wherein the additional slot offset value varies in relation to an additional processing time needed for RAR message decoding compared to Physical Downlink Control Channel, PDCCH, decoding and rounded to a next higher number of slots in an uplink numerology of the PUSCH.
14. A base station for a cellular communications system, comprising:
processing circuitry operable to cause the base station to:
transmit a Random Access Response, RAR, message to a User Equipment, UE, wherein:
the RAR message comprises an indication of a time-domain resource allocation for a Msg3 transmission on a Physical Uplink Shared Channel, PUSCH; and
the time-resource allocation comprises a slot offset value, K2, for the Msg3 transmission on the PUSCH; and
receive, from the UE, a Msg3 transmission on the PUSCH in accordance with an increased slot offset value corresponding to a sum of the slot offset value and an additional slot offset value for the Msg3 transmission on the PUSCH,
wherein the additional slot offset value varies in relation to an amount of processing time allocated for RAR message decoding after Physical Downlink Control Channel, PDCCH, decoding.
15. The base station of claim 14 wherein the additional slot offset value corresponds to a subcarrier spacing of the PUSCH.
16. The base station of claim 14 wherein the PUSCH table is configured via system information or higher layer signaling.
17. The base station of claim 14 wherein the additional slot offset value varies in relation to an additional processing time needed for RAR message decoding compared to Physical Downlink Control Channel, PDCCH, decoding and rounded to a next higher number of slots in an uplink numerology of the PUSCH.
18. A method implemented in a base station for a cellular communications system, comprising:
transmitting a Random Access Response, RAR, message to a User Equipment, UE, wherein:
the RAR message comprises an indication of a time-domain resource allocation for a Msg3 transmission on a Physical Uplink Shared Channel, PUSCH; and
the time-resource allocation comprises a slot offset value, K2, for the Msg3 transmission on the PUSCH; and
receiving, from the UE, a Msg3 transmission on the PUSCH in accordance with an increased slot offset value, the increased slot offset value being a sum of the slot offset value and an additional slot offset value for the Msg3 transmission on the PUSCH,
wherein the additional slot offset value varies in relation to an amount of processing time allocated for RAR message decoding after Physical Downlink Control Channel, PDCCH, decoding.
19. The base station of claim 18 wherein the PUSCH table is configured via system information or higher layer signaling.
20. The base station of claim 18 wherein the additional slot offset value varies in relation to an additional processing time needed for RAR message decoding compared to Physical Downlink Control Channel, PDCCH, decoding and rounded to a next higher number of slots in an uplink numerology of the PUSCH.