Robust compatibility mode communication

1. A method of wireless communication at a user equipment (UE), the method comprising:

determining, based on an indication in system information, whether a robust compatibility mode (RCM) is supported between the UE and a base station;

establishing a RCM connection with the base station when the RCM is supported between the UE and the base station;

receiving, from the base station, through the RCM connection, a configuration associated with the RCM;

updating a behavior of the UE for a current situation of the UE based on the configuration; and

transmitting, to the base station, a request in a random access channel (RACH) message to access a wireless network with the updated behavior of the UE, the RACH message being transmitted after the RCM connection is established and after the configuration associated with the RCM is received, the configuration including a network assistance information (NAI) information element indicating one or more NAI-based feature set capabilities to which the UE is to update in the current situation of the UE.

2. The method of claim 1 , further comprising receiving, from the base station, a system information block comprising the indication of whether the RCM is supported between the UE and the base station.

3. The method of claim 2 , further comprising:

decoding remaining minimum system information (RMSI) through the system information block; and

determining, from the decoded RMSI, that the indication indicates that the RCM is supported between the UE and the base station.

4. The method of claim 2 , wherein the indication explicitly indicates an allocation of one or more robust communication resources (RCRs) for the RCM when the RCM is supported between the UE and the base station.

5. The method of claim 2 , wherein the indication indicates an available pool of robust communication resources (RCRs) for the RCM when the RCM is supported between the UE and the base station, further comprising selecting one or more specific robust communication resources from the available pool of robust communication resources.

6. The method of claim 1 , wherein updating the behavior of the UE comprises updating one or more feature set capabilities of the UE according to the one or more NAI-based feature set capabilities included in the NAI information element of the configuration.

7. The method of claim 6 , wherein the updating the one or more feature set capabilities of the UE comprises disabling the one or more feature set capabilities of the UE based on the current situation of the UE that alters the behavior of the UE to successfully access the wireless network.

8. The method of claim 7 , wherein the behavior of the UE is updated based on the configuration for a non-permanent duration until a disablement of the one or more feature set capabilities of the UE is removed.

9. The method of claim 6 , wherein the behavior of the UE is updated based on the configuration for a permanent duration.

10. The method of claim 6 , further comprising transmitting, to the base station, a UE capability update message indicating the updated one or more feature set capabilities of the UE according to the one or more NAI-based feature set capabilities included in the NAI information element of the configuration.

11. The method of claim 1 , wherein the NAI-based feature set capabilities are specific to one of a radio access technology (RAT), a cell, timing advance (TA), public land mobile network (PLMN) or a network operator.

12. An apparatus of wireless communication at a user equipment (UE), the apparatus comprising:

a transceiver;

at least one processor; and

one or more memories, coupled to the at least one processor and the transceiver, having computer executable code stored thereon, the code which when executed by the at least one processor individually or in combination, causes the apparatus to:

determine, based on an indication in system information, whether a robust compatibility mode (RCM) is supported between the UE and a base station;

establish a RCM connection with the base station when the RCM is supported between the UE and the base station;

receive, from the base station, through the RCM connection, a configuration associated with the RCM;

update a behavior of the UE for a current situation of the UE based on the configuration; and

transmit, to the base station, a request in a random access channel (RACH) message to access a wireless network with the updated behavior of the UE, the RACH message being transmitted after the RCM connection is established and after the configuration associated with the RCM is received, the configuration including a network assistance information (NAI) information element indicating one or more NAI-based feature set capabilities to which the UE is to update in the current situation of the UE.

13. The apparatus of claim 12 , wherein the code, which when executed by the at least one processor, further causes the apparatus to receive, from the base station, a system information block comprising the indication of whether the RCM is supported between the UE and the base station.

14. The apparatus of claim 13 , wherein the code, which when executed by the at least one processor, further causes the apparatus to:

decode remaining minimum system information (RMSI) through the system information block; and

determine, from the decoded RMSI, that the indication indicates that the RCM is supported between the UE and the base station.

15. The apparatus of claim 13 , wherein the indication explicitly indicates an allocation of one or more robust communication resources (RCRs) for the RCM when the RCM is supported between the UE and the base station.

16. The apparatus of claim 13 , wherein the indication indicates an available pool of robust communication resources (RCRs) for the RCM when the RCM is supported between the UE and the base station, and the code, when executed by the at least one processor, further causes the apparatus to select one or more specific robust communication resources from the available pool of robust communication resources.

17. The apparatus of claim 12 , wherein updating the behavior of the UE comprises to update one or more feature set capabilities of the UE according to the one or more NAI-based feature set capabilities included in the NAI information element of the configuration.

18. The apparatus of claim 17 , wherein the updating the one or more feature set capabilities of the UE comprises to disable the one or more feature set capabilities of the UE based on the current situation of the UE that alters the behavior of the UE to successfully access the wireless network.

19. The apparatus of claim 18 , wherein the behavior of the UE is updated based on the configuration for a non-permanent duration until a disablement of the one or more feature set capabilities of the UE is removed.

20. The apparatus of claim 17 , wherein the behavior of the UE is updated based on the configuration for a permanent duration.

21. The apparatus of claim 17 , wherein the code, which when executed by the at least one processor, further causes the apparatus to transmit, to the base station, a UE capability update message indicating the updated one or more feature set capabilities of the UE according to the one or more NAI-based feature set capabilities included in the NAI information element of the configuration.

22. The apparatus of claim 12 , wherein the NAI-based feature set capabilities are specific to one of a radio access technology (RAT), a cell, timing advance (TA), public land mobile network (PLMN) or a network operator.

23. A method of wireless communication at a base station, the method comprising:

transmitting, to a user equipment (UE), a system information block comprising an indication of whether a robust compatibility mode (RCM) is supported between the UE and the base station;

establishing a RCM connection with the UE when the RCM is supported between the UE and the base station;

transmitting, to the UE, through the RCM connection, a configuration associated with the RCM; and

receiving, from the UE, a request in a random access channel (RACH) message to access a wireless network with updated behavior of the UE based on the configuration associated with the RCM, the RACH message being received after the RCM connection is established and after the configuration associated with the RCM is transmitted, the configuration including a network assistance information (NAI) information element indicating one or more NAI-based feature set capabilities to which the UE is to update in a current situation of the UE.

24. The method of claim 23 , further comprising receiving, from the UE, a UE capability update message indicating an update to one or more feature set capabilities of the UE according to the one or more NAI-based feature set capabilities included in the NAI information element of the configuration.

25. An apparatus for wireless communication at a base station, the apparatus comprising:

a transceiver;

at least one processor; and

one or more memories, coupled to the at least one processor and the transceiver, having computer executable code stored thereon, the code which when executed by the at least one processor individually or in combination, causes the apparatus to:

transmit, to a user equipment (UE), a system information block comprising an indication of whether a robust compatibility mode (RCM) is supported between the UE and the base station;

establish a RCM connection with the UE when the RCM is supported between the UE and the base station;

transmit, to the UE, through the RCM connection, a configuration associated with the RCM; and

receive, from the UE, a request in a random access channel (RACH) message to access a wireless network with updated behavior of the UE based on the configuration associated with the RCM, the RACH message being received after the RCM connection is established and after the configuration associated with the RCM is transmitted, the configuration including a network assistance information (NAI) information element indicating one or more NAI-based feature set capabilities to which the UE is to update in a current situation of the UE.

26. The apparatus of claim 25 , wherein the code, which when executed by the at least one processor, further causes the apparatus to receive, from the UE, a UE capability update message indicating an update to one or more feature set capabilities of the UE according to the one or more NAI-based feature set capabilities included in the NAI information element of the configuration.