UE capability reporting method and apparatus
A UE capability reporting method is provided to resolve a problem that when UE is handed over from a source access network device to a target access network device, UE capability information obtained by the target access network device is incomplete. A solution is as follows: UE obtains first information, where the first information is used to indicate a UE capability supported by a target access network device; and the UE reports second information based on the UE capability supported by the target access network device and a UE capability of the UE, where the second information includes capability information, other than UE capability information stored in a source access network device, in target capability information, and the target capability information is UE capability information of a lower UE capability in the UE capability of the UE and the UE capability supported by the target access network device.
1 . A user equipment UE capability reporting method, wherein the method comprises:
obtaining, by UE, first information, wherein the first information is used to indicate a UE capability supported by a target access network device;
reporting, by the UE, second information based on the UE capability supported by the target access network device and a UE capability of the UE, wherein the second information comprises capability information which is absent of UE capability information stored in a source access network device in target capability information, and wherein the target capability information is UE capability information of a lower UE capability in the UE capability of the UE and the UE capability supported by the target access network device; and
receiving, by the UE, a UE capability enquiry request from the target access network device, wherein the UE capability enquiry request carries the first information and information indicating the UE capability supported by the source access network device.
2 . The method according to claim 1 , wherein the method further comprises:
when the UE capability of the UE is higher than a UE capability supported by the source access network device and the UE capability supported by the target access network device is higher than the UE capability supported by the source access network device, determining, by the UE, to report the second information.
3 . The method according to claim 1 , wherein the method further comprises:
receiving, by the UE, third information, wherein the third information is used to instruct the UE to report the second information.
4 . The method according to claim 1 , wherein the method further comprises:
receiving, by the UE, a radio resource control (RRC) connection reconfiguration from the source access network device, wherein the RRC connection reconfiguration carries the first information; and
the reporting, by the UE, second information comprises: sending, by the UE, an RRC connection reconfiguration complete to the target access network device, wherein the RRC connection reconfiguration complete carries the second information.
5 . The method according to claim 1 , wherein
the reporting, by the UE, second information comprises: sending, by the UE, a UE capability enquiry response to the target access network device, wherein the UE capability enquiry response carries the second information.
6 . The method according to claim 1 , wherein the method further comprises:
receiving, by the UE, a UE capability enquiry request from the source access network device, wherein the UE capability enquiry request carries the first information; and
the reporting, by the UE, second information comprises: sending, by the UE, a UE capability enquiry response to the source access network device, wherein the UE capability enquiry response carries the second information.
7 . A communications system, wherein the communications system comprises user equipment UE, a target access network device, and a source access network device, wherein
the UE is configured to obtain first information, wherein the first information is used to indicate a UE capability supported by the target access network device;
the UE is configured to report second information based on the UE capability supported by the target access network device and a UE capability of the UE, wherein the second information comprises capability information which is absent of UE capability information stored in a source access network device in target capability information, and wherein the target capability information is UE capability information of a lower UE capability in the UE capability of the UE and the UE capability supported by the target access network device; and
receiving a UE capability enquiry request from the target access network device, wherein the UE capability enquiry request carries the first information and information indicating the UE capability supported by the source access network device.
8 . The communications system according to claim 7 , wherein
the target access network device is configured to send a handover request acknowledge to the source access network device, wherein the handover request acknowledge carries the first information;
the source access network device is configured to send a radio resource control (RRC) connection reconfiguration to the UE;
that the UE is configured to obtain first information comprises: the UE is configured to receive the RRC connection reconfiguration from the source access network device, wherein the RRC connection reconfiguration carries the first information;
that the UE is configured to report second information comprises: the UE sends an RRC connection reconfiguration complete to the target access network device; and
the target access network device is configured to receive the RRC connection reconfiguration complete from the UE, wherein the RRC connection reconfiguration complete carries the second information.
9 . The communications system according to claim 7 , wherein
the target access network device is configured to send a UE capability enquiry request to the UE;
that the UE is configured to obtain first information comprises: the UE is configured to receive the UE capability enquiry request from the target access network device, wherein the UE capability enquiry request carries the first information;
that the UE is configured to report second information comprises: the UE sends a UE capability enquiry response to the target access network device; and
the target access network device is further configured to receive the UE capability enquiry response from the UE, wherein the UE capability enquiry response carries the second information.
10 . The communications system according to claim 7 , wherein
the source access network device is configured to send a UE capability enquiry request to the UE;
that the UE is configured to obtain first information comprises: the UE is configured to receive the UE capability enquiry request from the source access network device, wherein the UE capability enquiry request carries the first information;
that the UE is configured to report second information comprises: the UE sends a UE capability enquiry response to the source access network device;
the source access network device is further configured to receive the UE capability enquiry response from the UE, wherein the UE capability enquiry response carries the second information;
the source access network device is further configured to send a handover request to the target access network device, wherein the handover request carries the second information and the UE capability information stored in the source access network device; and
the target access network device is configured to receive the handover request from the source access network device, and send a handover request acknowledge to the source access network device.
11 . User equipment UE, wherein the UE comprises a processor and a communications interface, and the processor and the communications interface are configured to support the UE in performing a method, wherein the method comprises:
obtaining first information, wherein the first information is used to indicate a UE capability supported by a target access network device;
reporting second information based on the UE capability supported by the target access network device and a UE capability of the UE, wherein the second information comprises capability information which is absent of UE capability information stored in a source access network device in target capability information, and wherein the target capability information is UE capability information of a lower UE capability in the UE capability of the UE and the UE capability supported by the target access network device; and
receiving a UE capability enquiry request from the target access network device, wherein the UE capability enquiry request carries the first information and information indicating the UE capability supported by the source access network device.
12 . The UE according to claim 11 , wherein the method further comprises:
when the UE capability of the UE is higher than a UE capability supported by the source access network device and the UE capability supported by the target access network device is higher than the UE capability supported by the source access network device, determining to report the second information.
13 . The UE according to claim 11 , wherein the method further comprises:
receiving third information, wherein the third information is used to instruct the UE to report the second information.
14 . The UE according to claim 11 , wherein the method further comprises:
receiving a radio resource control (RRC) connection reconfiguration from the source access network device, wherein the RRC connection reconfiguration carries the first information; and
the reporting second information comprises: sending an RRC connection reconfiguration complete to the target access network device, wherein the RRC connection reconfiguration complete carries the second information.
15 . The UE according to claim 11 , wherein
the reporting second information comprises: sending a UE capability enquiry response to the target access network device, wherein the UE capability enquiry response carries the second information.
16 . The UE according to claim 11 , wherein the method further comprises:
receiving a UE capability enquiry request from the source access network device, wherein the UE capability enquiry request carries the first information; and
the reporting second information comprises: sending a UE capability enquiry response to the source access network device, wherein the UE capability enquiry response carries the second information.