Configuration of the initial active bandwidth part for initial network access
Methods and devices for configuring an initial active downlink bandwidth part as part of an initial access procedure are provided. In one provided method, a base station broadcasts a synchronization signal block (SSB) that includes a control resource set (CORESET) configuration index. The CORESET configuration index is one of a plurality of CORESET configuration indexes, each CORESET configuration index being associated with a respective configuration of a CORESET. Each configuration includes a CORESET frequency size, a CORESET time duration, and a frequency offset of the CORESET with respect to the SSB selected from a set of predefined frequency offsets. The initial active downlink bandwidth part is defined as having the same frequency location and bandwidth as the CORESET. The base station transmits, as part of a physical downlink control channel (PDCCH) within the CORESET, information indicating scheduling of remaining minimum system information (RMSI) in a physical downlink shared channel (PDSCH).
1. A method for a base station in a wireless communication network, the method comprising:
broadcasting, as part of a synchronization signal block (SSB), a control resource set (CORESET) configuration index, the CORESET configuration index being one of a plurality of CORESET configuration indexes, each CORESET configuration index being associated with a respective configuration of a CORESET, each configuration comprising: a CORESET frequency size, a CORESET time duration, and a frequency offset of the CORESET with respect to the SSB, the frequency offset selected from a set of predefined frequency offsets, the set of predefined frequency offsets comprising at least one of:
a first frequency offset wherein a frequency location of the CORESET is substantially aligned with respect to a lowest frequency location of the SSB;
a second frequency offset wherein the frequency location of the CORESET is substantially aligned with respect to a highest frequency location of the SSB; and
a third frequency offset wherein the frequency location of the CORESET is substantially aligned with respect to a center frequency location of the SSB.
2. The method of claim 1 , wherein:
a first subset of the configurations define the CORESET as being time division multiplexed (TDM) with the SSB; and
a second subset of the configurations define the CORESET as being frequency division multiplexed (FDM) with the SSB.
3. The method of claim 2 , wherein, for the first subset of the configurations that define the CORESET as being TDM with the SSB, the first frequency offset is such that the lowest physical resource block (PRB) of the CORESET is the highest PRB among those whose subcarrier 0 lies on or before the subcarrier 0 of the lowest PRB of the SSB, the second frequency offset is such that the highest PRB of the CORESET is the lowest PRB among those whose subcarrier 0 lies on or after the subcarrier 0 of the highest PRB of the SSB, and the third frequency offset is such that a center PRB of the CORESET is the highest PRB among those whose subcarrier 0 lies on or before the subcarrier 0 of a center PRB of the SSB.
4. The method of claim 2 , wherein, for the second subset of the configurations that define the CORESET as being FDM with the SSB, the first frequency offset is such that the highest physical resource block (PRB) of the CORESET is separated from the lowest PRB of the SSB by a first guard, the first guard comprising at least G 1 PRBs having a numerology for a remaining minimum system information (RMSI) transmission, where G 1 is an integer >0, and the second frequency offset is such that the lowest PRB of the CORESET is separated from the highest PRB of the SSB by a second guard, the second guard comprising at least G 2 PRBs having the numerology for the RMSI transmission, where G 2 is an integer >0.
5. The method of claim 1 , wherein a value of the frequency offset is a number of physical resource blocks (PRBs) of a PRB grid, the PRB grid having a numerology for a remaining minimum system information (RMSI) transmission.
6. The method of claim 1 , wherein the CORESET configuration associated with the CORESET configuration index is based on a subcarrier spacing of the CORESET.
7. The method of claim 1 , wherein the CORESET configuration associated with the CORESET configuration index is based on an operating frequency range of the wireless communication network.
8. The method of claim 1 , wherein the CORESET configuration index is for indicating a first CORESET sub-configuration, the method further comprising:
broadcasting, as part of the SSB, a second CORESET configuration index, the second CORESET configuration index for indicating a second CORESET sub-configuration, each second sub-configuration comprising a time configuration of the CORESET.
9. A method for an electronic device (ED) in a wireless communication network, the method comprising:
receiving, as part of a synchronization signal block (SSB), a control resource set (CORESET) configuration index, the CORESET configuration index being one of a plurality of CORESET configuration indexes, each CORESET configuration index being associated with a respective configuration of a CORESET, each configuration comprising: a CORESET frequency size, a CORESET time duration, and a frequency offset of the CORESET with respect to the SSB, the frequency offset selected from a set of predefined frequency offsets, the set of predefined frequency offsets comprising at least one of:
a first frequency offset wherein a frequency location of the CORESET is substantially aligned with respect to a lowest frequency location of the SSB;
a second frequency offset wherein the frequency location of the CORESET is substantially aligned with respect to a highest frequency location of the SSB; and
a third frequency offset wherein the frequency location of the CORESET is substantially aligned with respect to a center frequency location of the SSB; and
configuring, in accordance with the CORESET configuration associated with the CORESET configuration index, an initial active downlink bandwidth part for receiving downlink transmissions from the wireless communication network.
10. The method of claim 9 , wherein:
a first subset of the configurations define the CORESET as being time division multiplexed (TDM) with the SSB; and
a second subset of the configurations define the CORESET as being frequency division multiplexed (FDM) with the SSB.
11. The method of claim 10 , wherein, for the first subset of the configurations that define the CORESET as being TDM with the SSB, the first frequency offset is such that the lowest physical resource block (PRB) of the CORESET is the highest PRB among those whose subcarrier 0 lies on or before the subcarrier 0 of the lowest PRB of the SSB, the second frequency offset is such that the highest PRB of the CORESET is the lowest PRB among those whose subcarrier 0 lies on or after the subcarrier 0 of the highest PRB of the SSB, and the third frequency offset is such that a center PRB of the CORESET is the highest PRB among those whose subcarrier 0 lies on or before the subcarrier 0 of a center PRB of the SSB.
12. The method of claim 10 , wherein, for the second subset of the configurations that define the CORESET as being FDM with the SSB, the first frequency offset is such that the highest physical resource block (PRB) of the CORESET is separated from the lowest PRB of the SSB by a first guard, the first guard comprising at least G 1 PRBs having a numerology for a remaining minimum system information (RMSI) transmission, where G is an integer >0, and the second frequency offset is such that the lowest PRB of the CORESET is separated from the highest PRB of the SSB by a second guard, the second guard comprising at least G 2 PRBs having the numerology for the RMSI transmission, where G 2 is an integer >0.
13. The method of claim 9 , wherein a value of the frequency offset is a number of physical resource blocks (PRBs) of a PRB grid, the PRB grid having a numerology for a remaining minimum system information (RMSI) transmission.
14. The method of claim 9 , wherein the CORESET configuration associated with the CORESET configuration index is based on a subcarrier spacing of the CORESET.
15. The method of claim 9 , wherein the CORESET configuration associated with the CORESET configuration index is based on a operating frequency range of the wireless communication network.
16. The method of claim 9 , wherein the CORESET configuration index is for indicating a first CORESET sub-configuration, the method further comprising:
receiving, as part of the SSB, a second CORESET configuration index, the second CORESET configuration index for indicating a second CORESET sub-configuration, each second sub-configuration comprising a time configuration of the CORESET.
17. A base station in a wireless communication network, the base station comprising:
a memory storage comprising instructions; and
one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to:
broadcast, as part of a synchronization signal block (SSB), a control resource set (CORESET) configuration index, the CORESET configuration index being one of a plurality of CORESET configuration indexes, each CORESET configuration index being associated with a respective configuration of a CORESET, each configuration comprising: a CORESET frequency size, a CORESET time duration, and a frequency offset of the CORESET with respect to the SSB, the frequency offset selected from a set of predefined frequency offsets, the set of predefined frequency offsets comprising at least one of:
a first frequency offset wherein a frequency location of the CORESET is substantially aligned with respect to a lowest frequency location of the SSB;
a second frequency offset wherein the frequency location of the CORESET is substantially aligned with respect to a highest frequency location of the SSB; and
a third frequency offset wherein the frequency location of the CORESET is substantially aligned with respect to a center frequency location of the SSB.
18. The base station of claim 17 , wherein:
a first subset of the configurations define the CORESET as being time division multiplexed (TDM) with the SSB; and
a second subset of the configurations define the CORESET as being frequency division multiplexed (FDM) with the SSB.
19. The base station of claim 18 , wherein, for the first subset of the configurations that define the CORESET as being TDM with the SSB, the first frequency offset is such that the lowest physical resource block (PRB) of the CORESET is the highest PRB among those whose subcarrier 0 lies on or before the subcarrier 0 of the lowest PRB of the SSB, the second frequency offset is such that the highest PRB of the CORESET is the lowest PRB among those whose subcarrier 0 lies on or after the subcarrier 0 of the highest PRB of the SSB, and the third frequency offset is such that a center PRB of the CORESET is the highest PRB among those whose subcarrier 0 lies on or before the subcarrier 0 of a center PRB of the SSB.
20. The base station of claim 18 , wherein, for the second subset of the configurations that define the CORESET as being FDM with the SSB, the first frequency offset is such that the highest physical resource block (PRB) of the CORESET is separated from the lowest PRB of the SSB by a first guard, the first guard comprising at least G 1 PRBs having a numerology for a remaining minimum system information (RMSI) transmission, where G 1 is an integer >0, and the second frequency offset is such that the lowest PRB of the CORESET is separated from the highest PRB of the SSB by a second guard, the second guard comprising at least G 2 PRBs having the numerology for the RMSI transmission, where G 2 is an integer >0.
21. The base station of claim 17 , wherein a value of the frequency offset is a number of physical resource blocks (PRBs) of a PRB grid, the PRB grid having a numerology for a remaining minimum system information (RMSI) transmission.
22. The base station of claim 17 , wherein the CORESET configuration associated with the CORESET configuration index is based on a subcarrier spacing of the CORESET.
23. The base station of claim 17 , wherein the CORESET configuration associated with the CORESET configuration index is based on a operating frequency range of the wireless communication network.
24. The base station of claim 17 , wherein:
the CORESET configuration index is for indicating a first CORESET sub-configuration; and
the one or more processors further execute the instructions to:
broadcast, as part of the SSB, a second CORESET configuration index, the second CORESET configuration index for indicating a second CORESET sub-configuration, each second sub-configuration comprising a time configuration of the CORESET.
25. An electronic device (ED) in a wireless communication network, the ED comprising:
a memory storage comprising instructions; and
one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to:
receive, as part of a synchronization signal block (SSB), a control resource set (CORESET) configuration index, the CORESET configuration index being one of a plurality of CORESET configuration indexes, each CORESET configuration index being associated with a respective configuration of a CORESET, each configuration comprising: a CORESET frequency size, a CORESET time duration, and a frequency offset of the CORESET with respect to the SSB, the frequency offset selected from a set of predefined frequency offsets, the set of predefined frequency offsets comprising at least one of:
a first frequency offset wherein a frequency location of the CORESET is substantially aligned with respect to a lowest frequency location of the SSB;
a second frequency offset wherein the frequency location of the CORESET is substantially aligned with respect to a highest frequency location of the SSB; and
a third frequency offset wherein the frequency location of the CORESET is substantially aligned with respect to a center frequency location of the SSB; and
configure, in accordance with the CORESET configuration associated with the CORESET configuration index, an initial active downlink bandwidth part for receiving downlink transmissions from the wireless communication network.
26. The ED of claim 25 , wherein:
a first subset of the configurations define the CORESET as being time division multiplexed (TDM) with the SSB; and
a second subset of the configurations define the CORESET as being frequency division multiplexed (FDM) with the SSB.
27. The ED of claim 26 , wherein, for the first subset of the configurations that define the CORESET as being TDM with the SSB, the first frequency offset is such that the lowest physical resource block (PRB) of the CORESET is the highest PRB among those whose subcarrier 0 lies on or before the subcarrier 0 of the lowest PRB of the SSB, the second frequency offset is such that the highest PRB of the CORESET is the lowest PRB among those whose subcarrier 0 lies on or after the subcarrier 0 of the highest PRB of the SSB, and the third frequency offset is such that a center PRB of the CORESET is the highest PRB among those whose subcarrier 0 lies on or before the subcarrier 0 of a center PRB of the SSB.
28. The ED of claim 26 , wherein, for the second subset of the configurations that define the CORESET as being FDM with the SSB, the first frequency offset is such that the highest physical resource block (PRB) of the CORESET is separated from the lowest PRB of the SSB by a first guard, the first guard comprising at least G 1 PRBs having a numerology for a remaining minimum system information (RMSI) transmission, where G 1 is an integer >0, and the second frequency offset is such that the lowest PRB of the CORESET is separated from the highest PRB of the SSB by a second guard, the second guard comprising at least G 1 PRBs having the numerology for the RMSI transmission, where G 2 is an integer >0.
29. The ED of claim 25 , wherein a value of the frequency offset is a number of physical resource blocks (PRBs) of a PRB grid, the PRB grid having a numerology for a remaining minimum system information (RMSI) transmission.
30. The ED of claim 25 , wherein the CORESET configuration associated with the CORESET configuration index is based on a subcarrier spacing of the CORESET.
31. The ED of claim 25 , wherein the CORESET configuration associated with the CORESET configuration index is based on a operating frequency range of the wireless communication network.
32. The ED of claim 25 , wherein:
the CORESET configuration index is an for indicating a first CORESET sub-configuration; and
the one or more processors further execute the instructions to:
receive, as part of the SSB, a second CORESET configuration index, the second CORESET configuration index for indicating a second CORESET sub-configuration, each second sub-configuration comprising a time configuration of the CORESET.