Techniques for configuring and indicating radio resource control (RRC) messages in wireless communications
Aspects described herein relate to configuring and indicating radio resource control (RRC) message types in wireless communications, to support new UE categories, new operation modes, new use cases, or a combination thereof. Configuration and indication methods that may support co-existence of new and legacy RRC message types and/or user equipment (UE) procedures for decoding new RRC message type are also described.
1. An apparatus for wireless communication, comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to:
receive, from a base station, a radio resource control (RRC) message; and
where resources for receiving the RRC message are resources for a new RRC message type that is different from legacy RRC message types or where a message type indication of the RRC message indicates that the RRC message is of the new RRC message type, decode the RRC message based on the new RRC message type,
wherein the resources for the RRC message of the new RRC message type are different from resources for receiving legacy RRC messages at least in time, frequency, space, code domain, or a combination of thereof.
2. The apparatus of claim 1 , wherein the one or more processors are configured to decode the RRC message further based on determining, based on the new RRC message type, that decoding of the new RRC message type is supported.
3. The apparatus of claim 1 , wherein the one or more processors are further configured to receive a scheduling information or an indication of the resources for receiving the RRC message, wherein the scheduling information or the indication of the resources correspond to the new RRC message type.
4. The apparatus of claim 3 , wherein the scheduling information or the indication of the resources indicates at least one of one or more monitoring occasions to receive the RRC message, a bandwidth part (BWP) for receiving the RRC message, a beam for receiving the RRC message, an antenna panel or port index for receiving the RRC message, a transmission configuration indicator (TCI) state for receiving the RRC message, or a scrambling scheme used to transmit the RRC message.
5. The apparatus of claim 1 , wherein the resources for the RRC message of the new RRC message type are shared with resources for receiving legacy RRC messages, and wherein the new RRC message type is associated with at least one of a different payload size, different number of fields, different field size for a common field, different mapping order for a media access control (MAC) sub-protocol data unit (PDU), or different contents for one or more MAC sub-headers, than for legacy RRC message types.
6. The apparatus of claim 1 , wherein the RRC message includes at least a configurable parameter that specifies the message type indication, and wherein the message type indication is useable for both legacy RRC message type and new RRC message type.
7. The apparatus of claim 6 , wherein the message type indication is specified as an extended value and wherein the one or more processors are configured to decode the RRC message based on the new RRC message type and determining the extended value.
8. The apparatus of claim 1 , wherein the new RRC message type includes a number of padding bits, wherein the message type indication is specified by configuring non-zero values for at least a portion of the number of padding bits, and wherein the one or more processors are configured to decode the RRC message based on the new RRC message type and detecting the non-zero values for at least the portion of the number of padding bits.
9. The apparatus of claim 1 , wherein the new RRC message type includes one or more spare or reserved bits, wherein the message type indication is specified by configuring non-zero values for at least one of the one or more spare or reserved bits, and wherein the one or more processors are configured to decode the RRC message based on the new RRC message type and detecting the non-zero values for at least one of the one or more spare or reserved bits.
10. The apparatus of claim 1 , wherein the message type indication is implied by a cyclic redundancy check (CRC) scheme of the RRC message, and wherein the one or more processors are configured to decode the RRC message based on the new RRC message type and performing a CRC scheme detection of the RRC message.
11. The apparatus of claim 1 , wherein the message type indication is implied by a control resource set or search space set configuration for a control channel scheduling the RRC message, and wherein the one or more processors are configured to decode the RRC message based on the new RRC message type and determining the control resource set or search space set configuration for the control channel.
12. The apparatus of claim 1 , wherein the message type indication is implied by a radio network temporary identifier (RNTI) used for scrambling the RRC message or masking a control channel that schedules the RRC message, and the one or more processors are configured to decode the RRC message based on the new RRC message type and determining the RNTI.
13. An apparatus for wireless communication, comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to:
generate a radio resource control (RRC) message that is of a new RRC message type that is different from legacy RRC message types, wherein the one or more processors are configured to generate the RRC message at least in part by at least one of scheduling resources for transmitting the RRC message to indicate that the RRC message is of the new RRC message type or including a message type indication of the RRC message to indicate that the RRC message is of the new RRC message type; and
transmit, to one or more user equipment (UEs), the RRC message,
wherein the resources are different from resources for receiving legacy RRC messages.
14. The apparatus of claim 3 wherein the one or more processors are further configured to transmit a scheduling information or an indication of the resources for transmitting the RRC message.
15. The apparatus of claim 13 , wherein the resources correspond to at least one of one or more monitoring occasions over which the RRC message is transmitted, a bandwidth part (BWP) for transmitting the RRC message, a beam for transmitting the RRC message, an antenna panel or port index for transmitting the RRC message, a transmission configuration indicator (TCI) state for transmitting the RRC message, or a scrambling scheme used to transmit the RRC message.
16. The apparatus of claim 13 , wherein the resources are shared with resources for transmitting legacy RRC messages, and wherein the new RRC message type is associated with at least one of a different payload size, different number of fields, different field size for a common field, different mapping order for a media access control (MAC) sub-protocol data unit (PDU), or different contents for one or more MAC sub-headers, than for legacy RRC message types.
17. The apparatus of claim 13 , wherein the one or more processors are configured to generate the RRC message to include a parameter that specifies the message type indication, and wherein the message type indication is useable for both legacy RRC message type and new RRC message type.
18. The apparatus of claim 17 , wherein the one or more processors are configured to generate the RRC message to include the message type indication specified as an extended value.
19. The apparatus of claim 13 , wherein the RRC message includes a number of padding bits, and wherein the one or more processors are configured to generate the RRC message to include the message type indication specified by configuring non-zero values for at least a portion of the number of padding bits.
20. The apparatus of claim 13 , wherein the RRC message includes one or more spare or reserved bits, and wherein the one or more processors are configured to generate the RRC message to include the message type indication specified by configuring non-zero values for at least one of the one or more spare or reserved bits.
21. The apparatus of claim 13 , wherein the one or more processors are configured to generate the RRC message based on a cyclic redundancy check (CRC) scheme that implies a value of the message type indication.
22. The apparatus of claim 13 , wherein the one or more processors are configured to generate the RRC message based on a control resource set or search space set configuration for a control channel scheduling the RRC message, and wherein the control resource set or synchronization signal set configuration implies the message type indication.
23. The apparatus of claim 13 , wherein the one or more processors are configured to generate the RRC message at least in part by scrambling the RRC message or masking a control channel that schedules the RRC message based on a radio network temporary identifier (RNTI), wherein the RNTI implies the message type indication.
24. A method for wireless communication by a user equipment (UE), comprising:
receiving, from a base station, a radio resource control (RRC) message; and
where resources for receiving the RRC message are resources for a new RRC message type that is different from legacy RRC message types or where a message type indication of the RRC message indicates that the RRC message is of the new RRC message type, decoding the RRC message based on the new RRC message type,
wherein the resources for the RRC message of the new RRC message type are different from resources for receiving legacy RRC messages at least in time, frequency, space, code domain, or a combination of thereof.
25. The method of claim 24 , wherein decoding the RRC message is further based on determining, based on the new RRC message type, that decoding of the new RRC message type is supported.
26. The method of claim 24 , further comprising receiving a scheduling information or an indication of the resources for receiving the RRC message, wherein the scheduling information or the indication of the resources correspond to the new RRC message type.
27. The method of claim 24 , wherein the resources for the RRC message of the new RRC message type are shared with resources for receiving legacy RRC messages, and wherein the new RRC message type is associated with at least one of a different payload size, different number of fields, different field size for a common field, different mapping order for a media access control (MAC) sub-protocol data unit (PDU), or different contents for one or more MAC sub-headers, than for legacy RRC message types.
28. The method of claim 24 , wherein the RRC message includes at least a configurable parameter that specifies the message type indication, and wherein the message type indication is useable for both legacy RRC message type and new RRC message type.
29. A method for wireless communication by a base station, comprising:
generating a radio resource control (RRC) message that is of a new RRC message type that is different from legacy RRC message types, wherein generating the RRC message includes at least one of scheduling resources for transmitting the RRC message to indicate that the RRC message is of the new RRC message type or including a message type indication of the RRC message to indicate that the RRC message is of the new RRC message type; and
transmitting, to one or more user equipment (UEs), the RRC message,
wherein the resources are different from resources for receiving legacy RRC messages.
30. The method of claim 29 , further comprising transmitting a scheduling information or an indication of the resources for transmitting the RRC message.