Enabling multiple starting symbol occasions for configured grants in new radio (nr) systems operating on unlicensed spectrum
A network device (e.g., a user equipment (UE), a new radio NB (gNB), or other network component) can process or generate a Physical Uplink Shared Channel (PUSCH) based on a configured grant that enables different configurations with multiple starting symbol occasions for the configured grants in new radio (NR) unlicensed communications. The PUSCH can be type A or as type B based on the configured grant. A number M of demodulation reference signals (DMRSs) and a number N of starting symbol occasions in a slot can be configured according to the configured grant, wherein M and N comprise an integer greater than zero, respectively.
1 . A baseband processor, comprising:
one or more processors configured to:
process a configured grant of a physical uplink shared channel (PUSCH) for an unlicensed communication, the configured grant indicating the PUSCH being type A or type B;
determine a number M of demodulation reference signals (DMRSs) and a number N of starting symbol occasions in a slot in response to initiation of a channel access for the PUSCH, wherein M and N comprise an integer of at least two, respectively;
wherein, responsive to the PUSCH being type A, uplink control information (UCI) is mapped to a resource located before a last DMRS in the slot and after a first DMRS in the slot, and
wherein, responsive to the PUSCH being type B, the UCI is mapped to a resource located after the last DMRS in the slot; and
a radio frequency (RF) interface, configured to provide, to RF circuitry, data for transmitting the unlicensed communication based on the configured grant.
2 . The baseband processor of claim 1 , wherein the number M and the number N comprise a range from two to four, wherein the number M and the number N are equal.
3 . The baseband processor of claim 1 , wherein the one or more processors are further configured to process a first starting symbol occasion and a second starting symbol occasion in the slot of the PUSCH, wherein the first starting symbol occasion and second starting symbol occasion are associated with a first listen-before-talk (LBT) operation and a second LBT operation respectively.
4 . The baseband processor of claim 1 , wherein the one or more processors are further configured to generate DMRSs at particular orthogonal sequence (OS) indices of the slot, wherein the particular OS indices are based on starting symbol occasions being located before OS #9 in the slot.
5 . The baseband processor of claim 1 , wherein the one or more processors are further configured to generate a first listen-before-talk (LBT) operation at a first LBT symbol occasion immediately before a first starting symbol occasion of the number N of starting symbol occasions, and puncture a first portion of the slot up to a second LBT operation at a second LBT symbol occasion immediately before a second starting symbol occasion of the number N of starting symbol occasions.
6 . The baseband processor of claim 1 , wherein the one or more processors are further configured to:
map a first code block group (CBG) to a first portion of the slot; and
map a second CBG associated with a transport block (TB) to a second portion of the slot.
7 . The baseband processor of claim 6 , wherein the one or more processors are further configured to align the first CBG and the second CBG with potential listen-before-talk (LBT) occasions in the slot, wherein the PUSCH is based on one or more CBGs, and puncture the one or more CBGs prior to a first successful LBT occasion.
8 . The baseband processor of claim 7 , wherein the one or more processors are further configured to:
re-transmit at least one of the one or more CBGs that are punctured in the slot at an end of a PUSCH transmission, and time-shifting the at least one of the one or more CBGs to start after the first successful LBT occasion, wherein any remaining CBG of the one or more CBGs that do not fit within a remainder of the slot are punctured.
9 . The baseband processor of claim 1 , wherein responsive to the PUSCH being type A, the number M of DMRSs are mapped to at least orthogonal sequence (OS) indices 2 and 11 of the slot.
10 . The baseband processor of claim 1 , wherein, responsive to the PUSCH being type B, the UCI is also mapped to another resource located after the first DMRS in the slot.
11 . The baseband processor of claim 1 , wherein the one or more processors are further configured to:
transmit contiguously in a mini-slot format for a remainder of the slot after a listen-before-talk (LBT) operation is performed, and configure a full slot format, until a final slot of the unlicensed communication.
12 . A non-transitory computer readable storage device storing executable instructions that, in response to execution, cause one or more processors of User Equipment (UE) for an unlicensed communication to perform operations, the operations comprising:
receiving a configured grant for a physical uplink shared channel (PUSCH);
generating the PUSCH for the unlicensed communication based on the configured grant;
determining a number M of demodulation reference signals (DMRSs) and a number N of starting symbol occasions, wherein M and N comprise an integer of at least two, respectively, wherein a first starting symbol occasion is configured with a first listen-before-talk (LBT) operation and a second starting symbol occasion is configured with a second LBT operation in a slot of the PUSCH;
mapping the number M of DMRSs to symbols after respective starting symbols of the number N of starting symbol occasions and map uplink control information (UCI) to a resource located before a last DMRS in the slot, in a case where the PUSCH is type A; and
mapping the UCI to a resource located after the last DMRS in the slot, in a case where the PUSCH is type B and the PUSCH has a mini-slot format.
13 . The non-transitory computer readable storage device of claim 12 , wherein the number M and the number N differ from one another.
14 . The non-transitory computer readable storage device of claim 12 , wherein the operations further comprise:
in response to the first LBT operation being unsuccessful, puncturing a first half of the PUSCH in the slot to accommodate a random starting offset.
15 . The non-transitory computer readable storage device of claim 12 , wherein the operations further comprise:
mapping a first code block group (CBG) at a first half of the slot and a second CBG at a second half of the slot, wherein at least one of the first CBG or the second CBG are aligned with the first starting symbol occasion or the second starting symbol occasion.
16 . The non-transitory computer readable storage device of claim 12 , wherein the operations further comprise:
in response to the first LBT operation failing at the first starting symbol occasion, time-shifting at least one first CBG of the slot from a first portion to a second portion of the slot.
17 . The non-transitory computer readable storage device of claim 12 , wherein the operations further comprise:
mapping a starting symbol and length indicator value (SLIV) to one or more DMRSs in the slot, wherein the slot comprises a first mini-slot associated with a first starting symbol occasion and a second mini-slot associated with a second starting symbol occasion.
18 . A baseband processor, comprising:
one or more processors configured to:
generate a configured grant of a physical uplink shared channel (PUSCH) for an unlicensed communication, the configured grant indicating the PUSCH being type A or type B;
configure a number M of demodulation reference signals (DMRSs) and a number N of starting symbol occasions for a slot, wherein M and N are respectively at least two and up to four, wherein a first starting symbol occasion of the number N of starting symbol occasions is configured with a starting offset of at least one symbol from a beginning of the slot;
map uplink control information (UCI) to a resource located before a last DMRS in the slot, in a case where the PUSCH is type A; and
map the UCI to a resource located after the last DMRS in the slot, in a case where the PUSCH is type B; and
a radio frequency (RF) interface, configured to provide, to RF circuitry, data for transmitting the unlicensed communication based on the configured grant.
19 . The baseband processor of claim 18 , wherein the one or more processors are further configured to generate a first listen-before-talk (LBT) operation at a first LBT symbol occasion immediately before the first starting symbol occasion.
20 . The baseband processor of claim 19 , wherein the one or more processors are further configured to configure the PUSCH with a mini-slot format.