APPARATUS AND METHOD FOR DEFERRING CELL UPDATE MESSAGES FROM USER EQUIPMENT

• US 20140098755A1
• Filed: 08/20/2013
• Published: 04/10/2014
• Est. Priority Date: 10/05/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: SHI, Yongsheng, KRISHNAMOORTHY, Sathish, HSU, Liangchi, KANAMARLAPUDI, Sitaramanjaneyulu, JINNU, Adarsh Kumar, VASUDEVAN, Guruvayurappan, GORUMUCHU, Mallikarjuna Rao
• Granted Patent: US 10,257,813 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 60/02 by periodical registration
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

Various aspects of the present disclosure enable a plurality of mobile devices (UEs) within a cell to spread out in time their respective transmissions of signaling messages, such as cell update messages, when the network enables or disables enhanced uplink (EUL, sometimes referred to as high-speed uplink packet access or HSUPA) while the UE is in the CELL_FACH state, by changing SIB5 or SIB5bis. In this way, the network load may be reduced, and a network blockage that otherwise might result from large numbers of UEs simultaneously transmitting the cell update message can be avoided. According to one example, a network node may be configured to distribute CELL_UPDATE messages or procedures to UEs when the network node enables or disables EUL in CELL_FACH by changing SIB5 or SIB5bis over time to reduce the network load. According to another example, a UE may be configured for utilizing a random timer or back-off timer to defer cell updates.

Claims

1. A method of wireless communication operable on a user equipment (UE), comprising:

receiving, while operating in a stand-by state, a broadcast message comprising an information element (IE) configured to turn on or off an enhanced uplink feature; and

transmitting a signaling message in response to the receiving of the broadcast message,

wherein the transmitting a signaling message follows a withholding of the transmitting until an occurrence of a predetermined event.

2. The method of claim 1, wherein the stand-by state comprises a CELL_FACH state.

3. The method of claim 1, further comprising detecting that a value of the IE configured to turn on or off the enhanced uplink feature has changed relative to a previous value of the IE.

4. The method of claim 1, wherein the signaling message comprises a request for an identifier corresponding to the enhanced uplink feature.

5. The method of claim 1, wherein the signaling message comprises a request to re-synchronize with a network node following a re-establishment of a radio link control (RLC) layer connection between the UE and the network node.

6. The method of claim 1, wherein the predetermined event comprises an expiration of a back-off timer.

7. The method of claim 6, further comprising:

determining a random value for the back-off timer; and

starting a running of the back-off timer at the receiving of the broadcast message,

wherein the expiration of the back-off timer occurs after a time corresponding to the random value.

8. The method of claim 1, wherein the predetermined event comprises a determination that one or more uplink data packets are ready for transmission on a data channel.

9. A user equipment (UE) configured for wireless communication, comprising:

means for receiving, while operating in a stand-by state, a broadcast message comprising an information element (IE) configured to turn on or off an enhanced uplink feature; and

means for transmitting a signaling message in response to the receiving of the broadcast message,

wherein the transmitting a signaling message follows a withholding of the transmitting until an occurrence of a predetermined event.

10. The UE of claim 9, wherein the stand-by state comprises a CELL_FACH state.

11. The UE of claim 9, further comprising means for detecting that a value of the IE configured to turn on or off the enhanced uplink feature has changed relative to a previous value of the IE.

12. The UE of claim 9, wherein the signaling message comprises a request for an identifier corresponding to the enhanced uplink feature.

13. The UE of claim 9, wherein the signaling message comprises a request to re-synchronize with a network node following a re-establishment of a radio link control (RLC) layer connection between the UE and the network node.

14. The UE of claim 9, wherein the predetermined event comprises an expiration of a back-off timer.

15. The UE of claim 14, further comprising:

means for determining a random value for the back-off timer; and

means for starting a running of the back-off timer at the receiving of the broadcast message,

wherein the expiration of the back-off timer occurs after a time corresponding to the random value.

16. The UE of claim 9, wherein the predetermined event comprises a determination that one or more uplink data packets are ready for transmission on a data channel.

17. A user equipment (UE) configured for wireless communication, comprising:

at least one processor;

a memory communicatively coupled to the at least one processor; and

a wireless communication interface communicatively coupled to the at least one processor,

wherein the at least one processor is configured to;

receive, while operating in a stand-by state, a broadcast message comprising an information element (IE) configured to turn on or off an enhanced uplink feature; and

transmit a signaling message in response to the receiving of the broadcast message,

wherein the transmitting a signaling message follows a withholding of the transmitting until an occurrence of a predetermined event.

18. The UE of claim 17, wherein the stand-by state comprises a CELL_FACH state.

19. The UE of claim 17, wherein the at least one processor is further configured to detect that a value of the IE configured to turn on or off the enhanced uplink feature has changed relative to a previous value of the IE.

20. The UE of claim 17, wherein the signaling message comprises a request for an identifier corresponding to the enhanced uplink feature.

21. The UE of claim 17, wherein the signaling message comprises a request to re-synchronize with a network node following a re-establishment of a radio link control (RLC) layer connection between the UE and the network node.

22. The UE of claim 17, wherein the predetermined event comprises an expiration of a back-off timer.

23. The UE of claim 22, wherein the at least one processor is further configured to:

determine a random value for the back-off timer; and

start a running of the back-off timer at the receiving of the broadcast message,

wherein the expiration of the back-off timer occurs after a time corresponding to the random value.

24. The UE of claim 17, wherein the predetermined event comprises a determination that one or more uplink data packets are ready for transmission on a data channel.

25. A non-transitory computer-readable medium operable on a user equipment (UE) configured for wireless communication, comprising:

instructions for causing a computer to receive, while operating in a stand-by state, a broadcast message comprising an information element (IE) configured to turn on or off an enhanced uplink feature; and

instructions for causing a computer to transmit a signaling message in response to the receiving of the broadcast message,

wherein the transmitting a signaling message follows a withholding of the transmitting until an occurrence of a predetermined event.

26. The non-transitory computer-readable medium of claim 25, wherein the stand-by state comprises a CELL_FACH state.

27. The non-transitory computer-readable medium of claim 25, further comprising instructions for causing a computer to detect that a value of the IE configured to turn on or off the enhanced uplink feature has changed relative to a previous value of the IE.

28. The non-transitory computer-readable medium of claim 25, wherein the signaling message comprises a request for an identifier corresponding to the enhanced uplink feature.

29. The non-transitory computer-readable medium of claim 25, wherein the signaling message comprises a request to re-synchronize with a network node following a re-establishment of a radio link control (RLC) layer connection between the UE and the network node.

30. The non-transitory computer-readable medium of claim 25, wherein the predetermined event comprises an expiration of a back-off timer.

31. The non-transitory computer-readable medium of claim 30, further comprising:

instructions for causing a computer to determine a random value for the back-off timer; and

instructions for causing a computer to start a running of the back-off timer at the receiving of the broadcast message,

wherein the expiration of the back-off timer occurs after a time corresponding to the random value.

32. The non-transitory computer-readable medium of claim 25, wherein the predetermined event comprises a determination that one or more uplink data packets are ready for transmission on a data channel.