Random access channel transmission repetition in full-duplex communications

1 . An apparatus for wireless communication at a user equipment (UE), comprising:

a memory; and

one or more processors, coupled to the memory, that, based at least in part on information stored in the memory, are configured to:

transmit, in a half-duplex slot and in accordance with a random access channel (RACH) transmission repetition scheme, a first quantity of RACH transmissions; and

transmit, in accordance with the RACH transmission repetition scheme and in a full-duplex slot associated with a subband full-duplex (SBFD) configuration, a second quantity of RACH transmissions, the first quantity and the second quantity being based on a half-duplex slot type and a full-duplex slot type, respectively, wherein transmitting the second quantity of RACH transmissions comprises transmitting, in an uplink subband, a RACH transmission in a RACH occasion using a transmission power no greater than a maximum transmission power, based at least in part on the RACH occasion being adjacent to an edge of a downlink subband.

2 . The apparatus of claim 1 ,

wherein the one or more processors are further configured to receive configuration information associated with the RACH transmission repetition scheme, the configuration information indicative of the first quantity and the second quantity.

3 . The apparatus of claim 2 ,

wherein the configuration information explicitly indicates the first quantity and the second quantity.

4 . The apparatus of claim 1 ,

wherein the second quantity is based on a function of the first quantity.

5 . The apparatus of claim 1 ,

wherein a first quantity of RACH occasions in the half-duplex slot is based on a function of a first quantity of uplink resources in the half-duplex slot and a second quantity of RACH occasions in the full-duplex slot is based on a function of a second quantity of uplink resources in the full-duplex slot.

6 . The apparatus of claim 1 ,

wherein the second quantity is based on a set of resources associated with an uplink subband of the full-duplex slot.

7 . The apparatus of claim 6 ,

wherein the one or more processors, to transmit the second quantity of RACH transmissions, are configured to transmit the second quantity of RACH transmissions in the uplink subband.

8 . The apparatus of claim 1 ,

wherein the one or more processors, to transmit the second quantity of RACH transmissions, are configured to:

transmit, in an uplink subband, a first RACH transmission of the second quantity of RACH transmissions in a first valid RACH occasion, the first valid RACH occasion comprising a RACH occasion associated with a first frequency that corresponds to a first frequency gap between the first frequency and a downlink frequency associated with an adjacent downlink subband, wherein transmitting the first RACH transmission comprises transmitting the first RACH transmission prior to transmitting a second RACH transmission of the second quantity of RACH transmissions based on the first frequency gap satisfying a minimum gap threshold; and

transmit, in the uplink subband and subsequent to transmitting the first RACH transmission, the second RACH transmission in a second valid RACH occasion, the second valid RACH occasion comprising a RACH occasion associated with a second frequency that corresponds to a second frequency gap between the second frequency and the downlink frequency, wherein the first frequency gap is wider than the second frequency gap.

9 . The apparatus of claim 1 ,

wherein the one or more processors are further configured to receive an indication of the maximum transmission power.

10 . The apparatus of claim 9 ,

wherein the one or more processors, to receive the indication, are configured to receive a broadcast communication that includes the indication.

11 . The apparatus of claim 9 ,

wherein the one or more processors, to receive the indication, are configured to receive a radio resource control message that includes the indication.

12 . An apparatus for wireless communication at a network node, comprising:

a memory; and

one or more processors, coupled to the memory, that, based at least in part on information stored in the memory, are configured to:

receive, in a half-duplex slot and in accordance with a random access channel (RACH) transmission repetition scheme, a first quantity of RACH transmissions; and

receive, in accordance with the RACH transmission repetition scheme and in a full-duplex slot associated with a subband full-duplex (SBFD) configuration, a second quantity of RACH transmissions, the first quantity and the second quantity being based on a half-duplex slot type and a full-duplex slot type, respectively, wherein the one or more processors, to receive the second quantity of RACH transmissions, are configured to receive, in an uplink subband, a RACH transmission in a RACH occasion, the RACH transmission being transmitted using a transmission power that is no greater than a maximum transmission power based at least in part on the RACH occasion being adjacent to an edge of a downlink subband.

13 . The apparatus of claim 12 ,

wherein the one or more processors are further configured to transmit configuration information associated with the RACH transmission repetition scheme, the configuration information indicative of the first quantity and the second quantity.

14 . The apparatus of claim 13 ,

wherein the configuration information explicitly indicates the first quantity and the second quantity.

15 . The apparatus of claim 12 ,

wherein the second quantity is based on a function of the first quantity.

16 . The apparatus of claim 12 ,

wherein a first quantity of RACH occasions in the half-duplex slot is based on a function of a first quantity of uplink resources in the half-duplex slot and a second quantity of RACH occasions in the full-duplex slot is based on a function of a second quantity of uplink resources in the full-duplex slot.

17 . The apparatus of claim 12 ,

wherein the second quantity is based on a set of resources associated with an uplink subband of the full-duplex slot.

18 . The apparatus of claim 17 ,

wherein the one or more processors, to receive the second quantity of RACH transmissions, are configured to receive the second quantity of RACH transmissions in the uplink subband.

19 . The apparatus of claim 12 ,

wherein the one or more processors, to receive the second quantity of RACH transmissions, are configured to:

receive, in an uplink subband, a first RACH transmission of the second quantity of RACH transmissions in a first valid RACH occasion, the first valid RACH occasion comprising a RACH occasion associated with a first frequency that corresponds to a first frequency gap between the first frequency and a downlink frequency associated with an adjacent downlink subband, wherein receiving the first RACH transmission comprises receiving the first RACH transmission prior to receiving a second RACH transmission of the second quantity of RACH transmissions based on the first frequency gap satisfying a minimum gap threshold; and

receive, in the uplink subband and subsequent to receiving the first RACH transmission, the second RACH transmission in a second valid RACH occasion, the second valid RACH occasion comprising a RACH occasion associated with a second frequency that corresponds to a second frequency gap between the second frequency and the downlink frequency, wherein the first frequency gap is wider than the second frequency gap.

20 . The apparatus of claim 12 ,

wherein the one or more processors are further configured to transmit an indication of the maximum transmission power.

21 . The apparatus of claim 20 ,

wherein the one or more processors, to transmit the indication, are configured to transmit at least one of a broadcast communication that includes the indication or a radio resource control message that includes the indication.

22 . A method of wireless communication performed by a user equipment (UE), comprising:

transmitting, in a half-duplex slot and in accordance with a random access channel (RACH) transmission repetition scheme, a first quantity of RACH transmissions; and

transmitting, in accordance with the RACH transmission repetition scheme and in a full-duplex slot associated with a subband full-duplex (SBFD) configuration, a second quantity of RACH transmissions, the first quantity and the second quantity being based on a half-duplex slot type and a full-duplex slot type, respectively, wherein transmitting the second quantity of RACH transmissions comprises transmitting, in an uplink subband, a RACH transmission in a RACH occasion using a transmission power no greater than a maximum transmission power, based at least in part on the RACH occasion being adjacent to an edge of a downlink subband.

23 . The method of claim 22 , further comprising receiving configuration information associated with the RACH transmission repetition scheme, the configuration information indicative of the first quantity and the second quantity.

24 . The method of claim 23 , wherein the configuration information explicitly indicates the first quantity and the second quantity.

25 . The method of claim 22 , wherein the second quantity is based on a function of the first quantity.

26 . A method of wireless communication performed by a network node, comprising:

receiving, in a half-duplex slot and in accordance with a random access channel (RACH) transmission repetition scheme, a first quantity of RACH transmissions; and

receiving, in accordance with the RACH transmission repetition scheme and in a full- duplex slot associated with a subband full-duplex (SBFD) configuration, a second quantity of RACH transmissions, the first quantity and the second quantity being based on a half-duplex slot type and a full-duplex slot type, respectively, wherein receiving the second quantity of RACH transmissions comprises receiving, in an uplink subband, a RACH transmission in a RACH occasion, wherein the RACH transmission is transmitted using a transmission power no greater than a maximum transmission power, based at least in part on the RACH occasion being adjacent to an edge of a downlink subband.

27 . The method of claim 26 ,

further comprising transmitting configuration information associated with the RACH transmission repetition scheme, the configuration information indicative of the first quantity and the second quantity.

28 . The method of claim 27 ,

wherein the configuration information explicitly indicates the first quantity and the second quantity.

29 . The method of claim 22 ,

wherein a first quantity of RACH occasions in the half-duplex slot is based on a function of a first quantity of uplink resources in the half-duplex slot and a second quantity of RACH occasions in the full-duplex slot is based on a function of a second quantity of uplink resources in the full-duplex slot.

30 . The method of claim 22 ,

wherein the second quantity is based on a set of resources associated with an uplink subband of the full-duplex slot.