Methods, UE and network node for handling a bandwidth part configuration
The present disclosure relates to telecommunications. In one of its aspects, the disclosure concerns a method performed by a User Equipment (UE) in a communications system. The method comprises receiving information indicating a Bandwidth Part (BWP) configuration from a network node. The BWP configuration comprises at least one initial BWP and at least one non-initial BWP. The method further comprises transmitting, to the network node, a Random Access (RA) preamble message according to the received BWP configuration to initiate a RA procedure with the network node.
1 . A method performed by a User Equipment, UE, in a communications system, the method comprising:
receiving information indicating a Bandwidth Part, BWP, configuration from a network node, wherein the BWP configuration comprises multiple initial BWPs and at least one non-initial BWP, wherein a non-initial BWP of the at least one non-initial BWP comprises a plurality of Listen-Before-Talk, LBT, sub bands, with RACH occasions, ROs, configured across a plurality of said plurality of LBT sub bands, and the ROs belong to a same or different PRACH configuration, wherein at least one parameter is defined in the PRACH configuration and comprises a first parameter indicating an offset of a lowest PRACH transmission occasion in frequency domain with respect to a first physical resource block within one LBT sub band and a second parameter indicating a number of PRACH transmission occasions in one time instance in one LBT sub band;
selecting one of the plurality of LBT sub bands; and
initiating a Random Access, RA, procedure with the network node according to the received BWP configuration, the initiating of the RA procedure comprising transmitting a RA preamble to the network node on the selected LBT sub band.
2 . The method according to claim 1 , wherein the multiple initial BWPs comprise a primary initial BWP and at least one secondary initial BWP.
3 . The method according to claim 2 , wherein the at least one secondary initial BWP is configured: via a supplementary carrier; or in a second cell which belongs to a same or a different cell group as the cell where the RA is triggered; or in the same cell as the primary initial BWP.
4 . The method according to claim 1 , wherein the non-initial BWP and another non-initial BWP of the at least one non-initial BWP comprise a PRACH resource in an overlapping LBT sub band.
5 . The method according to claim 1 , wherein the at least one parameter further comprises:
a reused at least one existing third parameter associated with LBT sub band.
6 . The method according to claim 5 , wherein the at least one parameter is defined for every sub band or for configured specific sub bands.
7 . A method performed by a network node in a communications system, the method comprising:
determining a Bandwidth Part, BWP, configuration, wherein the BWP configuration comprises multiple initial BWPs and at least one non-initial BWP, wherein a non-initial BWP of the at least one non-initial BWP comprises a plurality of Listen-Before-Talk, LBT, sub bands, with RACH occasions, ROs, configured across a plurality of said plurality of LBT sub bands, and the ROs belong to a same or different PRACH configuration, wherein at least one parameter is defined in the PRACH configuration and comprises a first parameter indicating an offset of a lowest PRACH transmission occasion in frequency domain with respect to a first physical resource block within one LBT sub band and a second parameter indicating a number of PRACH transmission occasions in one time instance in one LBT sub band;
transmitting information indicating the determined BWP configuration to a User Equipment, UE; and
receiving a Random Access, RA, preamble message from the UE according to the determined BWP configuration, including receiving the RA preamble on a selected LBT sub band of the plurality of LBT sub bands, wherein the selected LBT sub band has been selected by the UE.
8 . The method according to claim 7 , wherein the multiple initial BWPs comprise a primary initial BWP and at least one secondary initial BWP.
9 . The method according to claim 8 , wherein the at least one secondary initial BWP is configured: via a supplementary carrier; or in a second cell which belongs to a same or a different cell group as the cell where the RA is triggered; or in the same cell as the primary initial BWP.
10 . The method according to claim 7 , wherein the non-initial BWP and another non-initial BWP of the at least one non-initial BWP comprise a PRACH resource in an overlapping LBT sub band.
11 . The method according to claim 7 , wherein the at least one parameter further comprising:
a reused at least one existing third parameter associated with LBT sub band.
12 . The method according to claim 11 , wherein said at least one parameter is defined for every sub band or for configured specific sub bands.
13 . The method according to claim 7 , wherein a separate PRACH configuration is configured in a LBT sub band, wherein the separate PRACH configuration is associated with a LBT sub band index.
14 . A User Equipment, UE, in a communications system, the UE comprising:
processing circuitry; and
memory coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the UE to perform operations comprising:
receive information indicating a Bandwidth Part, BWP, configuration from a network node, wherein the BWP configuration comprises multiple initial BWPs and at least one non-initial BWP, wherein a non-initial BWP of the at least one non-initial BWP comprises a plurality of Listen-Before-Talk, LBT, sub band, with RACH occasions, ROs, configured across a plurality of said plurality of LBT sub bands, and the ROs belong to a same or different PRACH configuration, wherein at least one parameter is defined in the PRACH configuration and comprises a first parameter indicating an offset of a lowest PRACH transmission occasion in frequency domain with respect to a first physical resource block within one LBT sub band and a second parameter indicating a number of PRACH transmission occasions in one time instance in one LBT sub band; select one of the plurality of LBT sub bands; and
initiate a Random Access, RA, procedure with the network node according to the received BWP configuration and to transmit a RA preamble to the network node on the selected LBT sub band.
15 . A network node in a communications system, the network node comprising:
processing circuitry; and
memory coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the network node to perform operations comprising:
determine a Bandwidth Part, BWP, configuration, wherein the BWP configuration comprises multiple initial BWPs and at least one non-initial BWP wherein a non-initial BWP of the at least one non-initial BWP comprises a plurality of Listen-Before-Talk, LBT, sub bands, with RACH occasions, ROs, configured across a plurality of said plurality of LBT sub bands, and the ROs belong to a same or different PRACH configuration, wherein at least one parameter is defined in the PRACH configuration and comprises a first parameter indicating an offset of a lowest PRACH transmission occasion in frequency domain with respect to a first physical resource block within one LBT sub band and a second parameter indicating a number of PRACH transmission occasions in one time instance in one LBT sub band;
transmit information indicating the determined BWP configuration to a User Equipment, UE; and
receive a Random Access, RA, preamble message from the UE according to the determined BWP configuration, including to receive the RA preamble on a selected LBT sub band of the plurality of LBT sub bands, wherein the selected LBT sub band has been selected by the UE.
16 . The UE according to claim 14 , wherein the multiple initial BWPs comprise a primary initial BWP and at least one secondary initial BWP.
17 . The UE according to claim 16 , wherein the at least one secondary initial BWP is configured: via a supplementary carrier; or in a second cell which belongs to a same or a different cell group as the cell where the RA is triggered; or in the same cell as the primary initial BWP.
18 . The network node according to claim 15 , wherein the multiple initial BWPs comprise a primary initial BWP and at least one secondary initial BWP.