Apparatus and methods of enhanced mobility management

• US 9,998,961 B2
• Filed: 10/22/2013
• Issued: 06/12/2018
• 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
• Primary Examiner(s): Khan, Mehmood B
• Application Number:
  US14/060,350
• Publication Number:
  US 20140135010A1
• Time in Patent Office: 1,694 Days
• 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, by a processor of a user equipment (UE), a target cell as an active set candidate;

calculating, by the processor of the UE, a first filtered measurement of the target cell using a first time constant value;

calculating, by the processor of the UE, a second filtered measurement of the target cell using a second time constant value that is less than the first time constant value, wherein the first filtered measurement and the second filtered measurement are each a filtered EcpI_o measurement;

determining, by the processor of the UE, that a trigger adjustment condition exists based on an absolute value of a difference between the first filtered measurement and the second filtered measurement;

triggering, by the processor of the UE, an adjustment of a timing value that manages a sending time of a target cell add message to a serving cell based on determining that the trigger adjustment condition exists;

adjusting, by the processor of the UE, the 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; and

sending, by a transceiver of the UE, 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, wherein the timing value comprises at least one of a filtered EcpI_o time constant value, a time to trigger value, or a cell individual offset value.

3. The method of claim 1, wherein determining that the trigger adjustment condition exists further comprises determining that the absolute value is greater than or equal to a difference threshold value.

4. The method of claim 3, further comprising:

using, by the processor of the UE, the second filtered 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 measurement triggers the sending of the target cell add message at an earlier time relative to a time at which the sending of the target cell add message would be triggered using the first filtered measurement.

5. The method of claim 1, further comprising:

receiving, at the transceiver of the UE, an active cell update including the target cell in response to sending the target cell add message to the serving cell; and

adding, by the processor of the UE, the target cell to an active set in response to receiving the active cell update.

13. The method of claim 1, wherein the timing value is the first time constant value.

15. The method of claim 1, further comprising:

receiving, at the transceiver of the UE, a signal from a base station; and

comparing, by the processor of the UE, signal characteristics and/or other information carried by the received signal with a preset or predetermined set of conditions that identify a sufficient candidate to which the UE may be handed over.

6. 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 calculate a first filtered measurement of the target cell using a first time constant value;

at least one instruction executable to cause the computer to calculate a second filtered measurement of the target cell using a second time constant value that is less than the first time constant value, wherein the first filtered measurement and the second filtered measurement are each a filtered EcpIo measurement;

at least one instruction executable to cause the computer to determine that a trigger adjustment condition exists based on at least the first filtered measurement and the second filtered measurement;

at least one instruction executable to cause the computer to trigger an adjustment of a timing value that manages a sending time of a target cell add message to a serving cell based on determining that the trigger adjustment condition exists;

at least one instruction executable to cause the computer to adjust the 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; 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.

7. An apparatus for communication, comprising:

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

means for calculating a first filtered measurement of the target cell using a first time constant value;

means for calculating a second filtered measurement of the target cell using a second time constant value that is less than the first time constant value, wherein the first filtered measurement and the second filtered measurement are each a filtered EcpIo measurement;

means for determining that a trigger adjustment condition exists based on an absolute value of a difference between the first filtered measurement and the second filtered measurement;

means for triggering an adjustment of a timing value that manages a sending time of a target cell add message to a serving cell based on determining that the trigger adjustment condition exists;

means for adjusting the 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; 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.

8. 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;

calculate a first filtered measurement of the target cell using a first time constant value;

calculate a second filtered measurement of the target cell using a second time constant value that is less than the first time constant value, wherein the first filtered measurement and the second filtered measurement are each a filtered EcpIo measurement;

determine that a trigger adjustment condition exists based on an absolute value of a difference between the first filtered measurement and the second filtered measurement;

trigger an adjustment of a timing value that indicates a sending time of a target cell add message to a serving cell based on determining that the trigger adjustment condition exists;

adjust the 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; and

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

9. The user equipment apparatus of claim 8, wherein the timing value comprises at least one of a filtered EcpI_o time constant value, a time to trigger value, or a cell individual offset value.

10. The user equipment apparatus of claim 8, wherein to determine that the trigger adjustment condition exists, the processor is further configured to determine that the absolute value is greater than or equal to the difference threshold value.

11. The user equipment apparatus of claim 10, wherein the processor is further configured to execute the instructions to use the second filtered 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 measurement triggers the sending of the target cell add message at an earlier time relative to a time at which the sending of the target cell add message would be triggered using the first filtered measurement.

12. The user equipment apparatus of claim 8, 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.

14. The user equipment apparatus of claim 8, wherein the timing value is the first time constant value.