Carrier and frequency specific capability restrictions
A method for UE capability reduction on a per-component-carrier or a per-frequency-range basis is proposed. In NR networks, UE may be operating in multiple frequency ranges (FRs) and configured with multiple component carriers (CCs) under carrier aggregation. UE can detect an overheating problem due to the RF activity supporting high bandwidth or high MIMO rank on a specific FR or a specific CC. Accordingly, UE indicates to the network a preference for a capability reduction on the specific FR or the specific CC, e.g., a reduced number of carriers, a reduced maximum bandwidth, or a reduced MIMO rank. Such per-FR or per-CC request allows UE to restrict or reduce its capability in a manner that is specific to certain component carriers and/or certain frequency ranges rather than to a global capability reduction that affects all carriers/frequencies.
1. A method, comprising: operating on a plurality of non-overlapping frequency ranges of a radio access technology (RAT) by a user equipment (UE) in a wireless communication network, wherein each frequency range covers a plurality of frequency bands for the operation in the same RAT by the UE, wherein each frequency band covers a plurality of component carriers (CCs), and wherein at least one CC covers a plurality of bandwidth parts (BWPs) in frequency domain, and wherein each of the plurality of CCs of one of the plurality of non-overlapping frequency ranges have a shorter range and higher available channel bandwidth than each of the plurality of CCs of another one of the plurality of non-overlapping frequency ranges;
detecting an overheating condition related to at least one frequency range of the plurality of non-overlapping frequency ranges; and
transmitting an information message to the network in response to the detected overheating condition, wherein the information message comprises a request for a capability reduction related to the at least one frequency range of the plurality of non-overlapping frequency ranges,
wherein the request for capability reduction includes an indication that indicates capability reduction corresponding to each of the plurality of CCs of the frequency range for which the capability reduction is requested, and wherein the capability reduction involves reducing a maximum bandwidth for operation on the indicated frequency range for which the capability reduction is requested, wherein the maximum bandwidth for operation on the indicated frequency range refers to a maximum aggregated bandwidth across all carriers of the indicated frequency range.
2. The method of claim 1 , further comprising: receiving a reconfiguration from the network for the UE to operate with a reduced capability related to the indicated frequency range for which the capability reduction is requested.
3. The method of claim 1 , wherein the request includes a list of a plurality of requested reductions, wherein each of the plurality of requested reductions corresponds to each of the plurality of CCs, and wherein the indication comprises a position in the list of the plurality of requested reductions.
4. The method of claim 3 , wherein the list of the plurality of requested reductions is ordered according to a configured order of operating CCs for the UE.
5. The method of claim 1 , wherein the at least one frequency range of the plurality of frequency ranges comprises a millimeter-wave (mmWave) frequency range (FR2).
6. The method of claim 1 , wherein the capability reduction involves reducing a number of component carriers for operation on the indicated frequency range for which the capability reduction is requested.
7. The method of claim 1 , wherein the capability reduction involves reducing a MIMO rank for operation on the indicated frequency range for which the capability reduction is requested.
8. A User Equipment (UE), comprising:
one or more radio frequency (RF) modules that operate on a plurality of non-overlapping frequency ranges of a radio access technology (RAT) in a wireless communication network, wherein each frequency range covers a plurality of frequency bands for the operation in the same RAT by the UE, wherein each frequency band covers a plurality of component carriers (CCs), and wherein at least one CC covers a plurality of bandwidth parts (BWPs) in frequency domain, wherein each of the plurality of CCs of one of the plurality of non-overlapping frequency ranges have a shorter range and higher available channel bandwidth than each of the plurality of CCs of another one of the plurality of non-overlapping frequency ranges, and wherein the UE detects an overheating condition related to at least one frequency range of the plurality of non-overlapping frequency ranges; and
a transmitter that transmits an information message to the network in response to the detected overheating condition, wherein the information message comprises a request for a capability reduction related to the at least one frequency range of the plurality of non-overlapping frequency ranges, wherein the request for capability reduction includes an indication that indicates capability reduction corresponding to each of the plurality of CCs of the frequency range for which the capability reduction is requested, and wherein the capability reduction involves reducing a maximum bandwidth for operation on the indicated frequency range for which the capability reduction is requested, wherein the maximum bandwidth for operation on the indicated frequency range refers to a maximum aggregated bandwidth across all carriers of the indicated frequency range.
9. The UE of claim 8 , further comprising: a receiver that receives a reconfiguration from the network such that the UE operates with a reduced capability related to the indicated frequency range for which the capability reduction is requested.
10. The UE of claim 8 , wherein the request includes a list of a plurality of requested reductions, wherein each of the plurality of requested reductions corresponds to each of the plurality of CCs, and wherein the indication comprises a position in the list of the plurality of requested reductions.
11. The UE of claim 10 , wherein the list of the plurality of requested reductions is ordered according to a configured order of operating CCs for the UE.
12. The UE of claim 8 , wherein the at least one frequency range of the plurality of frequency ranges comprises a millimeter-wave (mmWave) frequency range (FR2).
13. The UE of claim 8 , wherein the capability reduction involves reducing a number of component carriers for operation on the indicated frequency range for which the capability reduction is requested.
14. The UE of claim 8 , wherein the capability reduction involves reducing a MIMO rank for operation on the indicated frequency range for which the capability reduction is requested.