Delaying a trigger of a scheduling request after handover

• US 9,554,308 B2
• Filed: 08/19/2014
• Issued: 01/24/2017
• Est. Priority Date: 03/25/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ambriss, Mouaffac, Shukair, Mutaz Zuhier Afif, Sawhney, Salil, Krishnamoorthi, Deepak
• Primary Examiner(s): Wu, Jianye
• Application Number:
  US14/463,085
• Publication Number:
  US 20150282207A1
• Time in Patent Office: 889 Days
• US Class Current: 1/1
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 36/0079 in case of hand-off failure or rejection
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure

Abstract

Methods, systems, and devices are described for transmitting scheduling requests for uplink transmission resources following a handover. A user equipment (UE) may determine that a handover from a first base station to a second base station has occurred, and may implement one or more processes to enhance efficiency in communications following the handover. A UE, for example, may wait for successful acquisition and/or derivation of timing information from a base station before attempting to schedule uplink resources with the base station.

Claims

1. A method of wireless communications using a mobile device, comprising:

determining that a handover from a first base station to a second base station has occurred; and

delaying transmission of a scheduling request to the second base station for a predetermined time period based at least in part on determining an absence, at the mobile device, of receipt of a Master Information Block (MIB) from the second base station following the handover.

2. The method of claim 1, wherein the delaying the transmission of the scheduling request comprises:

delaying the transmission of the scheduling request until a condition is satisfied.

3. The method of claim 2, wherein the condition being satisfied comprises:

receiving the MIB from the second base station.

4. The method of claim 1, further comprising:

determining that a System Information Block (SIB) has been received before the handover has occurred.

5. The method of claim 1, wherein the predetermined time period is based at least in part on an expected acquisition or an expected derivation of uplink timing through the MIB received from the second base station.

6. The method of claim 1, further comprising:

determining that data is to be transmitted to the second base station following the handover;

determining the absence of the MIB based on a determination that the MIB has not been received from the second base station following the handover; and

delaying the transmission of the scheduling request for the predetermined time period.

7. The method of claim 6, further comprising:

transmitting the scheduling request to the second base station based at least in part on determining that the MIB has been received following the handover.

8. The method of claim 1, further comprising:

determining, after expiration of the predetermined time period, whether the MIB has been received; and

further delaying the transmission of the scheduling request for a second predetermined time period responsive to determining a continued absence of the MIB from the second base station.

9. The method of claim 1, further comprising:

transmitting the scheduling request responsive to determining that the MIB has been received.

10. The method of claim 1, further comprising:

initiating a radio link failure (RLF) procedure in the absence of a receipt of the MIB within a second predetermined time period.

11. The method of claim 1, wherein the predetermined time period is based at least in part on a predetermined number of Long Term Evolution (LTE) frames.

12. An apparatus of wireless communications, comprising:

means for determining that a handover from a first base station to a second base station has occurred; and

means for delaying transmission of a scheduling request to the second base station for a predetermined time period based at least in part on determining an absence, at the apparatus, of receipt of a Master Information Block (MIB) from the second base station following the handover.

13. The apparatus of claim 12, wherein the means for delaying the transmission of the scheduling request delays the scheduling request until the MIB has been received from the second base station.

14. The apparatus of claim 12, further comprising:

means for determining that a System Information Block (SIB) has been received before the handover has occurred.

15. The apparatus of claim 12, wherein the predetermined time period is based at least in part on an expected acquisition or an expected derivation of uplink timing through the MIB received from the second base station.

16. The apparatus of claim 12, further comprising:

means for determining that data is to be transmitted to the second base station following the handover;

means for determining the absence of the MIB based on a determination that the MIB has not been received from the second base station following the handover; and

means for delaying the transmission of the scheduling request for the predetermined time period.

17. The apparatus of claim 16, further comprising:

means for transmitting the scheduling request to the second base station based at least in part on determining that the MIB has been received following the handover.

18. The apparatus of claim 12, further comprising:

means for determining, after expiration of the predetermined time period, whether the MIB has been received; and

means for further delaying the transmission of the scheduling request for a second predetermined time period responsive to determining a continued absence of the MIB from the second base station.

19. The apparatus of claim 12, further comprising:

means for transmitting the scheduling request responsive to determining that the MIB has been received.

20. The apparatus of claim 12, further comprising:

means for initiating a radio link failure (RLF) procedure in the absence of a receipt of the MIB within a second predetermined time period.

21. An apparatus of wireless communications, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to;

determine that a handover from a first base station to a second base station has occurred; and

delay transmission of a scheduling request to the second base station for a predetermined time period based at least in part on determining an absence, at the processor, of receipt of a Master Information Block (MIB) from the second base station following the handover.

22. The apparatus of claim 21, wherein the delaying the transmission of the scheduling request comprises:

delaying the scheduling request until the MIB has been received from the second base station.

23. The apparatus of claim 21, wherein the instructions are further executable by the processor to:

determine that data is to be transmitted to the second base station following the handover;

determine the absence of the MIB based on a determination that the MIB has not been received from the second base station following the handover; and

delay the transmission of the scheduling request for the predetermined time period.

24. The apparatus of claim 21, wherein the instructions are further executable by the processor to:

determine, after expiration of the predetermined time period, whether the MIB has been received; and

further delay the transmission of the scheduling request for a second predetermined time period responsive to determining a continued absence of the MIB from the second base station.

25. The apparatus of claim 21, wherein the instructions are further executable by the processor to:

transmit the scheduling request responsive to determining that the MIB has been received.

26. The apparatus of claim 21, wherein the instructions are further executable by the processor to:

initiate a radio link failure (RLF) procedure in the absence of a receipt of the MIB within a second predetermined time period.

27. A non-transitory computer-readable medium storing computer executable code for wireless communication, the code executable by a processor to:

determine that a handover from a first base station to a second base station has occurred; and

delay transmission of a scheduling request to the second base station for a predetermined time period based at least in part on determining an absence of receipt of a Master Information Block (MIB) from the second base station following the handover.