Method and apparatus for timing configuration of discovery signal and channel
A UE in a wireless communication system supporting a shared spectrum channel access is provided. The method comprises: determining a set of DSCH transmission windows based on a window periodicity, a window duration, and a window offset; determining a first set of SS/PBCH blocks within a DSCH transmission window of the set of DSCH transmission windows, wherein the first set of SS/PBCH blocks is QCLed; determining a second set of SS/PBCH blocks across at least two DSCH transmission windows being different DSCH windows of the set of DSCH transmission windows, wherein the second set of SS/PBCH blocks is QCLed; and receiving at least one SS/PBCH block that is located in the first set of SS/PBCH blocks or the second set of SS/PBCH blocks based on QCL information of the first set of SS/PBCH blocks or the second set of SS/PBCH blocks within the DSCH transmission window.
1. A user equipment (UE) in a wireless communication system supporting a shared spectrum channel access, the UE comprising:
at least one processor configured to:
determine a set of discovery signal and channel (DSCH) transmission windows based on a window periodicity, a window duration, and a window offset;
determine a first set of synchronization signals and physical broadcast channel (SS/PBCH) blocks within a DSCH transmission window of the set of DSCH transmission windows, wherein the first set of SS/PBCH blocks is quasi-co-located (QCLed); and
determine a second set of SS/PBCH blocks across at least two DSCH transmission windows, the at least two DSCH transmission windows being different DSCH windows of the set of DSCH transmission windows, wherein the second set of SS/PBCH blocks is QCLed; and
at least one transceiver operably connected to the at least one processor, the at least one transceiver configured to receive, from a base station (BS) over a downlink channel supporting the shared spectrum channel access, at least one SS/PBCH block that is located in the first set of SS/PBCH blocks or the second set of SS/PBCH blocks based on QCL information of the first set of SS/PBCH blocks or the second set of SS/PBCH blocks within the DSCH transmission window of the determined set of DSCH transmission windows.
2. The UE of claim 1 , wherein:
the at least one processor is further configured to determine the window periodicity for the DSCH transmission window of the set of the DSCH transmission windows as a periodicity of the at least one SS/PBCH block in the DSCH transmission window; and
the at least one transceiver does not receive the at least one SS/PBCH block outside the determined set of DSCH transmission windows.
3. The UE of claim 1 , wherein the at least one processor is further configured to determine the window duration for the DSCH transmission window of the set of the DSCH transmission windows, the window duration being configured from {0.5, 1, 2, 3, 4, 5} in a unit of milliseconds.
4. The UE of claim 1 , wherein the window offset for the DSCH transmission window of the set of DSCH transmission windows is fixed, and the DSCH transmission window of the set of DSCH transmission windows starts from a boundary of half frame.
5. The UE of claim 1 , wherein the at least one transceiver is further configured to receive the at least one SS/PBCH block based on candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows, and wherein:
a number of the candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is determined based on a sub-carrier spacing (SCS) of the at least one SS/PBCH block; and
a maximum number of the candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is determined a 20 for the SCS of the at least one SS/PBCH block as 30 kHz, and a 10 for the SCS of the at least one SS/PBCH block as 15 kHz.
6. The UE of claim 1 , wherein the at least one processor is further configured to determine a timing instance of the received at least one SS/PBCH block based on an index of candidate SS/PBCH block location within the DSCH transmission window of the set of DSCH transmission windows, and
wherein:
three least significant bits (LSBs) of the index of the candidate SS/PBCH block location is determined based on a demodulation reference signal (DMRS) associated with PBCH of the received at least one SS/PBCH block;
fourth LSB of the index of the candidate SS/PBCH block location is determined based on a bit ā Ā+ 7 in a payload of PBCH of the received at least one SS/PBCH block, if a maximum number of candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is 10 or 20; and
fifth LSB of the index of the candidate SS/PBCH block location is determined based on a bit ā Ā+ 6 in the payload of PBCH of the received at least one SS/PBCH block, if a maximum number of candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is 20.
7. The UE of claim 1 , wherein
the first set of SS/PBCH blocks is determined to be QCLed, if first SS/PBCH blocks in the first set of SS/PBCH blocks include a same value of (I mod K); and
the second set of SS/PBCH blocks are determined to be QCLed, if second SS/PBCH blocks in the second set of SS/PBCH blocks include a same value of (I mod K),
where I is an index of DMRS sequence associated with PBCH of the first SS/PBCH blocks or the second SS/PBCH blocks, and K is determined as one from {1, 2, 4, 8} based on a combination of a first field of subCarrierSpacingCommon and a least significant bit (LSB) of a second field ssb-SubcarrierOffset, wherein the first field and second field being included in a master information block (MIB) of the first and second set of SS/PBCH blocks.
8. A base station (BS) in a wireless communication system supporting a shared spectrum channel access, the BS comprising:
at least one transceiver configured to transmit, to a user equipment (UE) over a downlink channel supporting a shared spectrum channel access, at least one SS/PBCH block that is located in a first set of SS/PBCH blocks or a second set of SS/PBCH blocks within at least one discovery signal and channel (DSCH) transmission window of a set of DSCH transmission windows; and
at least one processor operably connected to the at least one transceiver, the at least one processor configured to:
determine the set of DSCH transmission windows based on a window periodicity, a window duration, and a window offset;
determine the first set of SS/PBCH blocks within a DSCH transmission window of the set of DSCH transmission windows, wherein the first set of SS/PBCH blocks is quasi-co-located (QCLed); and
determine the second set of SS/PBCH blocks across at least two DSCH transmission windows, the at least two DSCH transmission windows being different DSCH windows of the set of DSCH transmission windows, wherein the second set of SS/PBCH blocks is QCLed.
9. The BS of claim 8 , wherein:
the at least one processor is further configured to determine the window periodicity for the DSCH transmission window of the set of the DSCH transmission windows as a periodicity of the at least one SS/PBCH block in the DSCH transmission window; and
the at least one transceiver does not transmit the at least one SS/PBCH block outside the set of DSCH transmission windows.
10. The BS of claim 8 , wherein the at least one processor is further configured to determine the window duration for the DSCH transmission window of the set of the DSCH transmission windows, the window duration being configured from {0.5, 1, 2, 3, 4, 5} in a unit of milliseconds.
11. The BS of claim 8 , wherein the window offset for the DSCH transmission window of the set of DSCH transmission windows is fixed, and the DSCH transmission window of the set of DSCH transmission windows starts from a boundary of half frame.
12. The BS of claim 8 , wherein the at least one transceiver is further configured to transmit the at least one SS/PBCH block based on candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows, and wherein:
a number of the candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is determined based on a sub-carrier spacing (SCS) of the at least one SS/PBCH block; and
a maximum number of the candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is determined a 20 for the SCS of the at least one SS/PBCH block as 30 kHz, and a 10 for the SCS of the at least one SS/PBCH block as 15 kHz.
13. The BS of claim 8 , wherein the at least one processor is further configured to determine a timing instance of the received at least one SS/PBCH block based on an index of candidate SS/PBCH block location within the DSCH transmission window of the set of DSCH transmission windows, and
wherein:
three least significant bits (LSBs) of the index of the candidate SS/PBCH block location is determined based on a demodulation reference signal (DMRS) associated with PBCH of the received at least one SS/PBCH block;
fourth LSB of the index of the candidate SS/PBCH block location is determined based on a bit ā Ā+ 7 in a payload of PBCH of the received at least one SS/PBCH block, if a maximum number of candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is 10 or 20; and
fifth LSB of the index of the candidate SS/PBCH block location is determined based on a bit ā Ā+ 6 in the payload of PBCH of the received at least one SS/PBCH block, if a maximum number of candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is 20.
14. The BS of claim 8 , wherein:
the first set of SS/PBCH blocks is determined to be QCLed, if first SS/PBCH blocks in the first set of SS/PBCH blocks include a same value of (I mod K); and
the second set of SS/PBCH blocks are determined to be QCLed, if second SS/PBCH blocks in the second set of SS/PBCH blocks include a same value of (I mod K) where I is an index of DMRS sequence associated with PBCH of the first SS/PBCH blocks or the second SS/PBCH blocks, and K is determined as one from {1, 2, 4, 8} based on a combination of a first field of subCarrierSpacingCommon and a least significant bit (LSB) of a second field ssb-SubcarrierOffset, wherein the first field and second field being included in a master information block (MIB) of the first and second set of SS/PBCH blocks.
15. A method of a user equipment (UE) in a wireless communication system supporting a shared spectrum channel access, the method comprising:
determining a set of discovery signal and channel (DSCH) transmission windows based on a window periodicity, a window duration, and a window offset;
determining a first set of synchronization signals and physical broadcast channel (SS/PBCH) blocks within a DSCH transmission window of the set of DSCH transmission windows, wherein the first set of SS/PBCH blocks is quasi-co-located (QCLed);
determining a second set of SS/PBCH blocks across at least two DSCH transmission windows, the at least two DSCH transmission windows being different DSCH windows of the set of DSCH transmission windows, wherein the second set of SS/PBCH blocks is QCLed; and
receiving, from a base station (BS) over a downlink channel supporting the shared spectrum channel access, at least one SS/PBCH block that is located in the first set of SS/PBCH blocks or the second set of SS/PBCH blocks based on QCL information of the first set of SS/PBCH blocks or the second set of SS/PBCH blocks within the DSCH transmission window of the determined set of DSCH transmission windows.
16. The method of claim 15 , further comprising:
determining the window periodicity for the DSCH transmission window of the set of the DSCH transmission windows as a periodicity of the at least one SS/PBCH block in the DSCH transmission window; and
not receiving the at least one SS/PBCH block outside the determined set of DSCH transmission windows.
17. The method of claim 15 , further comprising
determining the window duration for the DSCH transmission window of the set of the DSCH transmission windows, the window duration being configured from {0.5, 1, 2, 3, 4, 5} milliseconds, and
determining the window offset for the DSCH transmission window of the set of DSCH transmission windows, the window offset being fixed, and the DSCH transmission window of the set of DSCH transmission windows starts from a boundary of half frame.
18. The method of claim 15 , further comprising receiving the at least one SS/PBCH block based on candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows, wherein
a number of the candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is determined based on a sub-carrier spacing (SCS) of the at least one SS/PBCH block; and
a maximum number of the candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is determined a 20 for the SCS of the at least one SS/PBCH block as 30 kHz, and a 10 for the SCS of the at least one SS/PBCH block as 15 kHz.
19. The method of claim 15 , further comprising determining a timing instance of the received at least one SS/PBCH block based on an index of candidate SS/PBCH block location within the DSCH transmission window of the set of DSCH transmission windows, wherein:
three least significant bits (LSBs) of the index of the candidate SS/PBCH block location is determined based on a demodulation reference signal (DMRS) associated with PBCH of the received at least one SS/PBCH block;
fourth LSB of the index of the candidate SS/PBCH block location is determined based on a bit ā Ā+ 7 in a payload of PBCH of the received at least one SS/PBCH block, if a maximum number of candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is 10 or 20; and
fifth LSB of the index of the candidate SS/PBCH block location is determined based on a bit ā Ā+ 6 in the payload of PBCH of the received at least one SS/PBCH block, if a maximum number of candidate SS/PBCH block locations within the DSCH transmission window of the set of DSCH transmission windows is 20.
20. The method of claim 15 , wherein:
the first set of SS/PBCH blocks is determined to be QCLed, if first SS/PBCH blocks in the first set of SS/PBCH blocks include a same value of (I mod K); and
the second set of SS/PBCH blocks are determined to be QCLed, if second SS/PBCH blocks in the second set of SS/PBCH blocks include a same value of (I mod K) where I is an index of DMRS sequence associated with PBCH of the first SS/PBCH blocks or the second SS/PBCH blocks, and K is determined as one from {1, 2, 4, 8} based on a combination of a first field of subCarrierSpacingCommon and a least significant bit (LSB) of a second field ssb-SubcarrierOffset, wherein the first field and second field being included in a master information block (MIB) of the first and second set of SS/PBCH blocks.