Cell selection based on class of user equipments
In a legacy gNB (e.g., pre-Rel. 17 gNB), RC UEs with only 1 or 2 receive antennas may have a geographic coverage area for control data and traffic data that is smaller than their geographic coverage area for SSB with respect to certain legacy gNBs. By contrast, at least some new gNBs (e.g., Rel. 17+ gNBs) have the capability to provide uniform geographic coverage for RC UEs with respect to SSB, control data and traffic data. In an aspect of the disclosure, a particular class of UEs (such as RC UEs) is steered towards particular cells (e.g., Rel. 17+ gNBs) via one or more biased class-specific cell selection parameters included in system information from the cells.
1. A method of operating a user equipment (UE) associated with a first class of UEs, comprising:
receiving, from a cell, system information indicating at least one cell selection parameter targeted to the first class of UEs; and
performing a cell selection procedure based in part on the at least one cell selection parameter,
wherein the at least one cell selection parameter is configured to bias the cell selection procedure to favor selection of the cell by UEs belonging to the first class of UEs, and
wherein the at least one cell selection parameter comprises a measured reference signal received quality (RSRQ) offset that is specific to the first class of UEs, a measured reference signal received power (RSRP) offset that is specific to the first class of UEs, or both.
2. The method of claim 1 , wherein the system information further indicates at least one other cell selection parameter targeted to a second class of UEs.
3. The method of claim 2 , wherein the cell selection procedure is performed without factoring in the at least one other cell selection parameter targeted to the second class of UEs.
4. The method of claim 1 , wherein the system information indicates the at least one cell selection parameter via a value that references a predetermined offset or threshold.
5. The method of claim 1 , wherein the at least one cell selection parameter comprises an indication as to whether UEs belonging to the first class of UEs are barred from accessing the cell.
6. The method of claim 1 , wherein the receiving comprises receiving multiple system information blocks (SIBs), and at least one of the multiple SIBs is targeted to both the first class of UEs and a second class of UEs.
7. The method of claim 1 , receiving supplemental information targeted to the first class of UEs to facilitate decoding of the system information by the first class of UEs.
8. The method of claim 1 ,
wherein the first class of UEs correspond to reduced capability (RC) UEs,
wherein the cell corresponds to a gNB with support for geographic coverage enhancement of control data and traffic data for RC UEs.
9. The method of claim 1 ,
wherein the cell is a serving cell of the UE,
wherein the least one cell selection parameter comprises at least one cell reselection parameter related to a neighbor cell of the UE, and
wherein the cell selection procedure is a cell reselection procedure.
10. The method of claim 9 , wherein the at least one cell reselection parameter comprises a received signal offset for the neighbor cell.
11. The method of claim 9 ,
wherein the first class of UEs correspond to reduced capability (RC) UEs,
wherein the neighbor cell corresponds to a gNB capable of providing support for geographic coverage enhancement of control data and traffic data for RC UEs.
12. The method of claim 9 ,
wherein the at least one cell reselection parameter comprises a black list of cells for which selection by the UE in association with the cell reselection procedure is prohibited, or
wherein the at least one cell reselection parameter comprises a white list of cells for which selection by the UE in association with the cell reselection procedure is allowed.
13. A method of operating a cell, comprising:
determining at least one cell selection parameter targeted to a first class of user equipments (UEs); and
transmitting system information indicating the at least one cell selection parameter,
wherein the at least one cell selection parameter is configured to bias UEs belonging to the first class of UEs to favor selection of the cell, and
wherein the at least one cell selection parameter comprises a measured reference signal received quality (RSRQ) offset that is specific to the first class of UEs, a measured reference signal received power (RSRP) offset that is specific to the first class of UEs, or both.
14. The method of claim 13 , wherein the system information further indicates at least one other cell selection parameter targeted to a second class of UEs.
15. The method of claim 13 , wherein the at least one cell selection parameter comprises a Reference Signal Received Power (RSRP) offset or a Reference Signal Received Quality (RSRQ) offset.
16. The method of claim 13 , wherein the system information indicates the at least one cell selection parameter via a value that references a predetermined offset or threshold.
17. The method of claim 13 , wherein the at least one cell selection parameter comprises an indication as to whether UEs belonging to the first class of UEs are barred from accessing the cell.
18. The method of claim 13 , further comprising:
transmitting supplemental information targeted to the first class of UEs in advance of the system information to facilitate decoding of the system information by the first class of UEs.
19. The method of claim 13 ,
wherein the first class of UEs correspond to reduced capability (RC) UEs,
wherein the cell corresponds to a gNB with support for geographic coverage enhancement of control data and traffic data for RC UEs.
20. The method of claim 13 ,
wherein the cell is a serving cell of the UE,
wherein the least one cell selection parameter comprises at least one cell reselection parameter related to a neighbor cell of the UE.
21. The method of claim 20 , wherein the at least one cell reselection parameter comprises a received signal offset for the neighbor cell.
22. The method of claim 20 ,
wherein the first class of UEs correspond to reduced capability (RC) UEs,
wherein the neighbor cell corresponds to a gNB with support for geographic coverage enhancement of control data and traffic data for RC UEs.
23. The method of claim 20 ,
wherein the at least one cell reselection parameter comprises a black list of cells for which selection by the UE in association with the cell reselection procedure is prohibited, or
wherein the at least one cell reselection parameter comprises a white list of cells for which selection by the UE in association with the cell reselection procedure is allowed.
24. A user equipment (UE) associated with a first class of UEs, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, from a cell, system information indicating at least one cell selection parameter targeted to the first class of UEs; and
perform a cell selection procedure based in part on the at least one cell selection parameter,
wherein the at least one cell selection parameter is configured to bias the cell selection procedure to favor selection of the cell by UEs belonging to the first class of UEs, and
wherein the at least one cell selection parameter comprises a measured reference signal received quality (RSRQ) offset that is specific to the first class of UEs, a measured reference signal received power (RSRP) offset that is specific to the first class of UEs, or both.
25. The UE of claim 24 ,
wherein the cell is a serving cell of the UE,
wherein the least one cell selection parameter comprises at least one cell reselection parameter related to a neighbor cell of the UE, and
wherein the cell selection procedure is a cell reselection procedure.
26. A cell, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine at least one cell selection parameter targeted to a first class of user equipments (UEs); and
transmit system information indicating the at least one cell selection parameter,
wherein the at least one cell selection parameter is configured to bias UEs belonging to the first class of UEs to favor selection of the cell UEs, and
wherein the at least one cell selection parameter comprises a measured reference signal received quality (RSRQ) offset that is specific to the first class of UEs, a measured reference signal received power (RSRP) offset that is specific to the first class of UEs, or both.
27. The cell of claim 26 ,
wherein the first class of UEs correspond to reduced capability (RC) UEs,
wherein the cell corresponds to a gNB with support for geographic coverage enhancement of control data and traffic data for RC UEs.