Methods of UE providing speed information to network

1. A method for a user equipment (UE), comprising:

obtaining speed information of the UE in a mobile communication network, wherein the speed information is taken from a speed group comprising a physical speed, a physical speed mapped on a pre-defined speed group, and a virtual speed;

setting a prohibit timer when speed information is sent to the network by the UE;

detecting a trigger event, wherein the trigger event is taken from a triggering group comprising one of the UE changing from RRC_IDLE state to RRC_CONNECTED state and the UE detecting a background traffic mode in RRC_CONNECTED state, and wherein the background traffic mode is detected when detecting at least one of conditions comprising detecting a specific background application, activating of UE screen power saving, and detecting no interaction from users; and

providing the speed information to the network by one or more predefined means when the prohibit timer expired and a sending condition is met, and wherein the sending condition comprises at least one of the trigger event is detected, and a speed exceeds a speed threshold.

2. The method of claim 1 , wherein the virtual speed comprises a cell change count or a number of cells that the UE has requested RRC connection during a certain period.

3. The method of claim 1 , wherein the predefined means is taken from a means group comprising RRC connection establishment, RRC connection re-establishment, a new IE in RRC measurement report, and a new RRC message.

4. The method of claim 1 , further comprising:

receiving and storing the speed threshold configuration from the network.

5. The method of claim 1 , further comprising:

forwarding the speed information to a target base station during handover.

6. A user equipment (UE), comprising:

a memory that stores a speed threshold and program instructions and data;

a processor invokes different modules to perform tasks in the UE, wherein the modules include:

a speed estimation module that obtains speed information in a mobile communication network, wherein the speed information is taken from a speed group comprising a physical speed, a physical speed mapped on pre-defined speed group, and a virtual speed, and sets a prohibit timer when the speed information is sent;

an event detection module that detects a trigger event, wherein the trigger event is taken from a triggering group comprising one of the UE changing from RRC_IDLE state to RRC_CONNECTED state and the UE detecting a background traffic mode in RRC_CONNECTED state, and wherein the background traffic mode is detected when detecting at least one of conditions comprising detecting a specific background application, activating of UE screen power saving, and detecting no interaction from users; and

a transmitter that transmits the speed information to the network by one or more predefined means when the prohibit timer expired and a sending condition is met, and wherein the sending condition comprises at least one of the trigger event is detected, and a speed exceeds the speed threshold.

7. The UE of claim 6 , wherein the virtual speed comprises a cell change count or a number of cells that the UE has requested RRC connection during a certain period.

8. The UE of claim 6 , wherein the predefined means is taken from a means group comprising RRC connection establishment, RRC connection re-establishment, a new IE in RRC measurement report, and a new RRC message.

9. The UE of claim 6 , further comprising:

a receiver that receives and storing the speed threshold configuration from the network.

10. The UE of claim 6 , wherein the transmitter forwards the speed information to a target base station during handover preparation.