Enhanced initial access procedures in wireless communication
Disclosed are techniques for differentiating between licensed and unlicensed bands in a common portion of frequency spectrum to facilitate initial access in a fifth generation (5G) new radio (NR) wireless communication system having an NR node. The techniques include an NR generating and UE processing frequency configuration information indicating whether the common portion of frequency spectrum is allocated as a licensed band or an unlicensed band to enable a determination that the frequency spectrum is configured as the licensed band or unlicensed band and thereby facilitate initial access.
1. A method, performed by a user equipment (UE) to facilitate initial access in a fifth generation (5G) new radio (NR) wireless communication system having an NR node, of differentiating between licensed and unlicensed bands in a common portion of frequency spectrum, the method comprising:
receiving frequency configuration information from the NR node, the frequency configuration information indicating whether the common portion of frequency spectrum is allocated as a licensed band or an unlicensed band, wherein receiving comprises receiving a Master Information Block (MIB) including an Information Element that acts as the frequency configuration information, and wherein the Information Element is a bitfield in the MIB having first and second values, the first value representing the frequency spectrum is configured as the licensed band and the second value representing that the frequency spectrum is configured as the unlicensed band; and
processing the frequency configuration information to determine that the frequency spectrum is configured as the licensed band or unlicensed band so as to facilitate initial access.
2. The method of claim 1 in which the receiving comprises receiving a Master Information Block (MIB) including an Information Element that acts as the frequency configuration information.
3. The method of claim 1 in which the frequency configuration information comprises a Cyclic Redundancy Code (CRC) mask applied to a Physical Broadcast Channel (PBCH), and the processing comprises attempting to decode the PBCH using values of the CRC mask corresponding to one of the licensed or unlicensed bands.
4. The method of claim 1 in which the frequency configuration information comprises different non-overlapping Global Synchronization Channel Numbers (GSCNs).
5. The method of claim 1 in which the wireless communication system comprises a primary cell (PCell) and a secondary cell (SCell), and the receiving comprises receiving the frequency configuration information as dedicated Radio Resource Control (RRC) signaling after the PCell is configured.
6. The method of claim 1 in which the frequency configuration information is represented by (1,1) values of
ā Ā+ 6 ,ā Ā+ 7
bits in a Physical Broadcast Channel (PBCH) payload.
7. The method of claim 1 in which the frequency configuration information is indicated through a Demodulation Reference Signal (DMRS) sequence of a Physical Broadcast Channel (PBCH).
8. The method of claim 1 in which the frequency configuration information is represented based on a position of a Primary Synchronization Signal (PSS) detected in symbol index zero.
9. The method of claim 1 in which the frequency configuration information is indicated through Master Information Block (MIB) content, the method further comprising making a hypothetical assumption as to the MIB content used for System Information Block (SIB) detection to determine that the frequency spectrum is configured as the licensed band or unlicensed band based on whether the hypothetical assumption results in successful SIB detection.
10. A non-transitory computer-readable storage medium of a user equipment (UE) configured to facilitate, in a fifth generation (5G) new radio (NR) wireless communication system having an NR node, initial access by differentiation between licensed and unlicensed bands in a common portion of frequency spectrum, the computer-readable storage medium including instructions that when executed by a processor, cause the processor to:
receive from an NR node frequency configuration information, the frequency configuration information indicating whether the common portion of frequency spectrum is allocated as a licensed band or an unlicensed band, wherein the frequency configuration information is represented by (1,1) values of
ā Ā+ 6 ,ā Ā+ 7
bits in a Physical Broadcast Channel (PBCH) payload; and
process the frequency configuration information to determine that the frequency spectrum is configured as the licensed band or unlicensed band so as to facilitate initial access.
11. The computer-readable storage medium of claim 10 in which the frequency configuration information comprises a Master Information Block (MIB) having an Information Element identifying the frequency spectrum is configured as one of the licensed band and unlicensed band.
12. The computer-readable storage medium of claim 10 in which the frequency configuration information comprises a Cyclic Redundancy Code (CRC) mask applied to a Physical Broadcast Channel (PBCH).
13. The computer-readable storage medium of claim 10 in which the frequency configuration information comprises different non-overlapping Global Synchronization Channel Numbers (GSCNs).
14. The computer-readable storage medium of claim 10 in which the wireless communication system comprises a primary cell (PCell) and a secondary cell (SCell), and the frequency configuration information is a dedicated Radio Resource Control (RRC) signal received after the PCell is configured.
15. The computer-readable storage medium of claim 10 in which the frequency configuration information is indicated through a Demodulation Reference Signal (DMRS) sequence of a Physical Broadcast Channel (PBCH).
16. The computer-readable storage medium of claim 10 in which the frequency configuration information is represented based on a position of a Primary Synchronization Signal (PSS) detected in symbol index zero.
17. The computer-readable storage medium of claim 10 in which the frequency configuration information is indicated through Master Information Block (MIB) content, the instructions further cause the processor to make a hypothetical assumption as to the MIB content used for System Information Block (SIB) detection to determine that the frequency spectrum is configured as the licensed band or unlicensed band based on whether the hypothetical assumption results in successful SIB detection.
18. A method, performed by a gNB to facilitate initial access of a user equipment (UE) in a fifth generation (5G) new radio (NR) wireless communication system, of indicating which one of a licensed band and unlicensed band is configured in a common portion of frequency spectrum, the method comprising:
generating frequency configuration information indicating whether the common portion of frequency spectrum is allocated as a licensed band or an unlicensed band, wherein the frequency configuration information is represented by (1,1) values of
ā Ā+ 6 ,ā Ā+ 7
bits in a Physical Broadcast Channel (PBCH) payload; and
providing to the UE the frequency configuration information to facilitate the initial access.