Methods, UE and network node for handling PRACH configurations
The present disclosure relates to telecommunications. In one of its aspects, the disclosure concerns a method performed by a User Equipment (UE) in a communication system. The method includes obtaining a Physical Random Access Channel (PRACH) configuration. The PRACH configuration indicates that the PRACH comprises at least one offset. The method further includes applying the PRACH configuration.
1 . A method performed by a User Equipment (UE) in a communications system, the method comprising:
obtaining a Physical Random Access Channel (PRACH) configuration, wherein the PRACH configuration indicates that the PRACH comprises at least one offset, wherein the at least one offset in the PRACH configuration causes consecutive Random Access Channel (RACH) occasions (ROs) in the frequency domain to be respectively and entirely within different Listen-Before-Talk (LBT) bandwidth segments of the same Bandwidth Part (BWP), wherein the at least one offset, as indicated by the PRACH configuration, adjusts a frequency offset between the consecutive ROs, covers a bandwidth of a guard band between the consecutive ROs, and overlaps at least part of two consecutive LBT bandwidth segments including the consecutive ROs; and
applying the PRACH configuration.
2 . The method according to claim 1 , wherein the at least one offset is located between two of the consecutive ROs in the frequency domain.
3 . The method according to claim 2 , wherein the at least one offset is an msg1-ROFrequencyOffset defined for a RACH-ConfigGeneric.
4 . The method according to claim 1 , wherein the at least one offset takes a value in a range between 0 and a maximum number of Physical Resource Blocks (PRB) minus 1.
5 . The method according to claim 1 , wherein the PRACH configuration comprises a location parameter, wherein the location parameter indicates a location of the at least one offset in the PRACH configuration.
6 . The method according to claim 5 , wherein the location parameter is an msg1-FDM-per-sub band parameter.
7 . The method according to claim 5 , wherein the location parameter is present when more than two ROs are configured in the frequency domain.
8 . The method according to claim 1 , wherein the step of obtaining the PRACH configuration comprises: determining the PRACH configuration or receiving the PRACH configuration from a network node directly or via some other node or memory unit.
9 . The method according to claim 1 , wherein the step of applying the PRACH configuration comprises: initiating a Random Access (RA) procedure according to the obtained PRACH configuration.
10 . The method according to claim 1 , wherein the UE is configured with multiple serving cells or carriers within a same timing advance group.
11 . The method according to claim 1 , wherein a value range of the at least one offset skips a bandwidth size of the guard band.
12 . The method according to claim 11 , wherein the guard band comprises at least a number of Physical Resource Blocks (PRBs) and a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols.
13 . The method according to claim 1 , wherein the PRACH configuration may indicate that the PRACH comprises the at least one offset and at least one of one or multiple location parameters, one or multiple ROs, and one or multiple guard bands.
14 . A method performed by a network node in a communications system, the method comprising:
providing a Physical Random Access Channel (PRACH) configuration to a User Equipment (UE) wherein the PRACH configuration indicates that the PRACH comprises at least one offset, wherein the at least one offset in the PRACH configuration causes consecutive Random Access Channel (RACH) occasions (ROs) in the frequency domain to be respectively and entirely within different Listen-Before-Talk (LBT) bandwidth segments of the same Bandwidth Part (BWP), wherein the at least one offset, as indicated by the PRACH configuration, adjusts a frequency offset between the consecutive ROs, covers a bandwidth of a guard band between the consecutive ROs, and overlaps at least part of two consecutive LBT bandwidth segments including the consecutive ROs in the PRACH configuration.
15 . The method according to claim 14 , wherein the method further comprises:
determining the PRACH configuration.
16 . The method according to claim 14 , wherein the at least one offset is located between two of the consecutive ROs in the frequency domain.
17 . A User Equipment (UE) in a communications system, the UE is adapted to:
obtain a Physical Random Access Channel (PRACH) configuration, wherein the PRACH configuration indicates that the PRACH comprises at least one offset, wherein the at least one offset in the PRACH configuration causes consecutive Random Access Channel (RACH) occasions (ROs) in the frequency domain to be respectively and entirely within different Listen-Before-Talk (LBT) bandwidth segments of the same Bandwidth Part (BWP), wherein the at least one offset, as indicated by the PRACH configuration, adjusts a frequency offset between the consecutive ROs, covers a bandwidth of a guard band between the consecutive ROs, and overlaps at least part of two consecutive LBT bandwidth segments including the consecutive ROs in the PRACH configuration; and
apply the PRACH configuration.
18 . A network node in a communications system, the network node comprising:
a processor; and
a memory, wherein the network node is adapted to:
provide a Physical Random Access Channel (PRACH) configuration to a User Equipment (UE) wherein the PRACH configuration indicates that the PRACH comprises at least one offset, wherein the at least one offset in the PRACH configuration causes consecutive Random Access Channel (RACH) occasions (ROs) in the frequency domain to be respectively and entirely within different Listen-Before-Talk (LBT) bandwidth segments of the same Bandwidth Part (BWP), wherein the at least one offset, as indicated by the PRACH configuration, adjusts a frequency offset between the consecutive ROs, covers a bandwidth of a guard band between the consecutive ROs, and overlaps at least part of two consecutive LBT bandwidth segments including the consecutive ROs in the PRACH configuration.