Inserting beam switching gaps between beam transmissions
Apparatuses, methods, and systems are disclosed for inserting beam switching gaps between beam transmissions. One apparatus includes a processor that that inserts a gap between contiguous transmissions from a mobile wireless communication network to a user equipment (“UE”) device, the contiguous transmissions scheduled on different beams. The apparatus includes a transceiver that indicates to the UE device a type of gap that is inserted between the contiguous transmissions that are scheduled on different beams and indicates to the UE device a number of empty symbols that are used between the contiguous transmissions that are scheduled on different beams.
1 . A network equipment (NE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the NE to:
insert a gap comprising one or more empty orthogonal frequency division multiplexing (OFDM) symbols between contiguous transmissions to a user equipment (UE) that are scheduled on different beams; and
indicate to the UE, via a higher layer parameter, a type of gap that is inserted between the contiguous transmissions that are scheduled on different beams;
wherein a number of empty OFDM symbols is determined based on a subcarrier spacing (SCS) of the transmission such that a total gap duration is equal to or greater than a beam switching delay when a cyclic prefix (CP) length is insufficient.
2 . The NE of claim 1 , wherein the at least one processor is configured to cause the NE to perform time domain mapping of synchronization signal blocks (SSBs) where a guard interval of OFDM symbols between contiguous SSB candidates remain empty for beam switching when a high SCS is used.
3 . The NE of claim 1 , wherein the at least one processor is configured to cause the NE to modify a downlink frame structure by adding different types of CPs to at least one OFDM symbol in synchronization signal block (SSB) slots.
4 . The NE of claim 1 , wherein the at least one processor is configured to cause the NE to use an extended CP for a first OFDM symbol of one or more of synchronization signal block (SSB) transmissions and type0-physical downlink control channel (PDCCH) transmissions in response to multiplexing pattern 3 being used.
5 . The NE of claim 1 , wherein the at least one processor is configured to cause the NE to use cyclic post-fix for a last OFDM symbol of one or more of synchronization signal block (SSB) transmissions and physical downlink shared channel (PDSCH)-system information block (SIB) transmissions in response to one of multiplexing pattern 2 and multiplexing pattern 3 being used.
6 . The NE of claim 1 , wherein the at least one processor is configured to cause the NE to use different waveforms for one of:
a first OFDM symbol of one or more of synchronization signal block (SSB) transmissions and type0-physical downlink control channel (PDCCH) transmissions in response to multiplexing pattern 3 being used; and
a last OFDM symbol of one or more of SSB transmissions and physical downlink shared channel (PDSCH)-system information block (SIB) transmissions in response to one of multiplexing pattern 2 and multiplexing pattern 3 being used.
7 . The NE of claim 6 , wherein the different waveforms comprise at least one of zero-tail (ZT)-DFT-s-OFDM, unique word (UW)-DFT-s-OFDM and UW-OFDM waveforms.
8 . The NE of claim 1 , wherein the at least one processor is configured to cause the NE to use a radio resource control (RRC) configuration parameter to indicate to the UE the type and a length of gap that is inserted between the contiguous transmissions that are scheduled on different beams.
9 . The NE of claim 1 , wherein the at least one processor is configured to cause the NE to introduce an additional gap between the contiguous transmissions such that a total gap becomes equal to or greater than a beam switching delay in response to a CP length not being sufficient to accommodate the beam switching delay.
10 . The NE of claim 1 , wherein the contiguous transmissions comprise one or more of synchronization signal block (SSB) transmissions, type0-physical downlink control channel (PDCCH) transmissions, and physical downlink shared channel (PDSCH)-system information block (SIB) transmissions.
11 . The NE of claim 1 , wherein the contiguous transmissions comprise one or more of physical downlink shared channel (PDSCH) transmissions, physical uplink shared channel (PUSCH) transmission, physical downlink control channel (PDCCH) transmissions, and physical uplink control channel (PUCCH) transmissions.
12 . A method, comprising:
inserting a gap comprising one or more empty orthogonal frequency division multiplexing (OFDM) symbols between contiguous transmissions to a user equipment (UE) that are scheduled on different beams; and
indicating to the UE, via a higher layer parameter, a type of gap that is inserted between the contiguous transmissions that are scheduled on different beams;
wherein a number of empty OFDM symbols is determined based on a subcarrier spacing (SCS) of the transmission such that a total gap duration is equal to or greater than a beam switching delay when a cyclic prefix (CP) length is insufficient.
13 . The method of claim 12 , wherein the contiguous transmissions comprise one or more of synchronization signal block (SSB) transmissions, type0-physical downlink control channel (PDCCH) transmissions, and physical downlink shared channel (PDSCH)-system information block (SIB) transmissions.
14 . The method of claim 12 , wherein the contiguous transmissions comprise one or more of physical downlink shared channel (PDSCH) transmissions, physical uplink shared channel (PUSCH) transmission, physical downlink control channel (PDCCH) transmissions, and physical uplink control channel (PUCCH) transmissions.
15 . The method of claim 12 , further comprising performing time domain mapping of synchronization signal blocks (SSBs) where a guard interval of OFDM symbols between contiguous SSB candidates remain empty for beam switching when a high (SCS) is used.
16 . The method of claim 12 , further comprising modifying a downlink frame structure by adding different types of (CPs) to at least one OFDM symbol in synchronization signal block (SSB) slots.
17 . The method of claim 12 , further comprising using an extended CP for a first OFDM symbol of one or more of synchronization signal block (SSB) transmissions and type0-physical downlink control channel (PDCCH) transmissions in response to multiplexing pattern 3 being used.
18 . The method of claim 12 , further comprising using cyclic post-fix for a last OFDM symbol of one or more of synchronization signal block (SSB) transmissions and physical downlink shared channel (PDSCH)-system information block (SIB) transmissions in response to one of multiplexing pattern 2 and multiplexing pattern 3 being used.
19 . The method of claim 12 , further comprising using different waveforms for one of:
a first OFDM symbol of one or more of synchronization signal block (SSB) transmissions and type0-physical downlink control channel (PDCCH) transmissions in response to multiplexing pattern 3 being used; and
a last OFDM symbol of one or more of SSB transmissions and physical downlink shared channel (PDSCH)-system information block (SIB) transmissions in response to one of multiplexing pattern 2 and multiplexing pattern 3 being used.
20 . A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive, via a higher layer parameter, a type of gap that is inserted between contiguous transmissions that are scheduled on different beams; and
use the type of gap and a number of empty symbols for one of initial access transmissions and data and/or control transmissions that are scheduled on different beams and a length of cyclic prefix is shorter than a delay for switching between the different beams;
wherein a number of empty orthogonal frequency division multiplexing (OFDM) symbols is determined based on a subcarrier (SCS) spacing of the transmission such that a total gap duration is equal to or greater than a beam switching delay when a cyclic prefix (CP) length is insufficient.