APPARATUS AND METHODS OF ENHANCED MOBILITY MANAGEMENT

• US 20140135010A1
• Filed: 10/22/2013
• Published: 05/15/2014
• Est. Priority Date: 11/12/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: MOHAN, Siddharth, Kapoor, Rohit, Sun, Haitong, Sambhwani, Sharad Deepak
• Granted Patent: US 9,998,961 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection

Abstract

Apparatus and methods of mobility management include identifying a target cell as an active set candidate. The apparatus and methods further include determining that a trigger adjustment condition exists, wherein the trigger adjustment condition triggers an adjustment of a timing value that indicates a sending time of a target cell add message to a serving cell. Moreover, the apparatus and methods include sending the target cell add message including the target cell to the serving cell based on determining that the trigger adjustment condition exists.

Claims

1. A method of mobility management, comprising:

identifying a target cell as an active set candidate;

determining that a trigger adjustment condition exists, wherein the trigger adjustment condition triggers an adjustment of a timing value that manages a sending time of a target cell add message to a serving cell; and

sending the target cell add message including the target cell to the serving cell based on determining that the trigger adjustment condition exists.

2. The method of claim 1, further comprising adjusting a timing value from a first value to a second value based on determining that the trigger adjustment condition exists, wherein the second value of the timing value triggers sending of the target cell add message at an earlier time relative to the first value of the timing value.

3. The method of claim 2, wherein the timing value comprises at least one of a filtered EcpI_o time constant value, a time to trigger value, and a cell individual offset value.

4. The method of claim 1, wherein determining that the trigger adjustment condition exists comprises determining that a velocity value of a user equipment (UE) is greater than or equal to a velocity threshold value, and further comprising adjusting a timing value based on the velocity that affects when to send the target cell add message to the serving cell.

5. The method of claim 1, wherein determining that the trigger adjustment condition exists comprises determining that a velocity value of a UE is greater than or equal to a velocity threshold value, and wherein the adjusted timing value is inversely proportional to the velocity of the UE.

6. The method of claim 5, wherein the adjusting of the timing value comprises at least one of decreasing the timing value when the velocity value is greater than or equal to the velocity threshold value and increasing the timing value when the velocity value is less than the velocity threshold value.

7. The method of claim 1, wherein determining that the trigger adjustment condition exists further comprises:

calculating a first filtered EcpI_o measurement with a first time constant value;

calculating a second filtered EcpI_o measurement with a second time constant less than a first time constant value; and

determining an absolute value of a difference between the first and second filtered EcpI_o measurements; and

comparing the absolute value to the difference threshold value for determining whether the absolute value is greater than or equal to the difference threshold value.

8. The method of claim 7, further comprising using the second filtered EcpI_o measurement for determining when to send the target cell add message when the absolute value is greater than or equal to the difference threshold value, wherein the second filtered EcpI_o measurement triggers the sending of the target cell add message at an earlier time relative to the first filtered EcpI_o measurement.

9. The method of claim 1, further comprising:

receiving an active cell update including the target cell in response to sending the target cell add message to the serving cell; and

adding the target cell to an active set in response to receiving the active cell update.

10. A non-transitory computer-readable medium, comprising:

at least one instruction executable to cause a computer to identify a target cell as an active set candidate;

at least one instruction executable to cause the computer to determine that a trigger adjustment condition exists, wherein the trigger adjustment condition triggers an adjustment of a timing value that manages a sending time of a target cell add message to a serving cell; and

at least one instruction executable to cause the computer to send the target cell add message including the target cell to the serving cell based on determining that the trigger adjustment condition exists.

11. An apparatus for communication, comprising:

means for identifying a target cell as an active set candidate;

means for determining that a trigger adjustment condition exists, wherein the trigger adjustment condition triggers an adjustment of a timing value that manages a sending time of a target cell add message to a serving cell; and

means for sending the target cell add message including the target cell to the serving cell based on determining that the trigger adjustment condition exists.

12. A user equipment apparatus, comprising:

a memory storing executable instructions; and

a processor in communication with the memory, wherein the processor is configured to execute the instructions to;

identify a target cell as an active set candidate;

determine that a trigger adjustment condition exists, wherein the trigger adjustment condition triggers an adjustment of a timing value that indicates a sending time of a target cell add message to a serving cell; and

send the target cell add message including the target cell to the serving cell based on determining that the trigger adjustment condition exists.

13. The user equipment apparatus of claim 12, wherein the processor is further configured to execute the instructions to adjust a timing value from a first value to a second value based on determining that the trigger adjustment condition exists, wherein the second value of the timing value triggers the sending of the target cell add message at an earlier time relative to the first value of the timing value.

14. The user equipment apparatus of claim 13, wherein the timing value comprises at least one of a filtered EcpI_o time constant value, and time to trigger value, or a cell individual offset value.

15. The user equipment apparatus of claim 12, wherein to determine that the trigger adjustment condition exists, the processor is further configured to execute the instructions to determine that a velocity value of a user equipment (UE) is greater than or equal to a velocity threshold value, and wherein the processor is further configured to execute the instructions to adjust a timing value based on the velocity that affects when to send the target cell add message to the serving cell.

16. The user equipment apparatus of claim 12, wherein to determine that the trigger adjustment condition exists, the processor is further configured to execute the instructions to determine that a velocity value of a user equipment (UE) is greater than or equal to a velocity threshold value, and wherein the adjusted timing value is inversely proportional to the velocity of the UE.

17. The user equipment apparatus of claim 16, wherein to adjust the timing value, the processor is further configured to execute the instructions to decrease the timing value when the velocity value is greater than or equal to the velocity or increase the timing value when the velocity value is less than the velocity threshold value.

18. The user equipment apparatus of claim 12, wherein to determine that the trigger adjustment condition exists, the processor is further configured to:

calculate a first filtered EcpI_o measurement with a first time constant value;

calculate a second filtered EcpI_o measurement with a second time constant less than a first time constant value; and

determine an absolute value of a difference between the first and second filtered EcpI_o measurements; and

compare the absolute value to a difference threshold value for determined whether the determined absolute value is greater than or equal to the difference threshold value.

19. The user equipment apparatus of claim 18, wherein the processor is further configured to execute the instructions to use the second filtered EcpI_o measurement for determining when to send the target cell add message when the absolute value is greater than or equal to the difference threshold value, wherein the second filtered EcpI_o measurement triggers the sending of the target cell add message at an earlier time relative to the first filtered EcpI_o measurement.

20. The user equipment apparatus of claim 12, wherein the processor is further configured to execute the instructions to:

receive an active cell update message including the target cell in response to sending the target cell add message to the serving cell; and

add the target cell to an active set in response to receiving the active cell update message.