Methods and apparatus for expeditiously releasing network resources for a mobile station based on low battery and lost signal conditions

• US 20050255893A1
• Filed: 05/14/2004
• Published: 11/17/2005
• Est. Priority Date: 05/14/2004
• Status: Active Grant

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Zhao, Wen, Jin, Xin, Islam, Muhammad Khaledul
• Granted Patent: US 7,130,667 B2
• Time in Patent Office: Days
• US Class Current: 455/572
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0277 according to available power supply, e.g. switching off when a low battery condition is detected
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods and apparatus for expeditiously releasing network resources for a mobile station based on low battery and lost signal conditions are disclosed. The wireless network (104) receives a power down warning message from the mobile station (102) indicative of a low battery condition. The wireless network (104) then identifies whether a lost signal condition exists with the mobile station (102). In response to receiving the power down warning message and subsequently identifying the lost signal condition, the wireless network (104) causes network resources for the mobile station to be released. The wireless network (104) infers that the mobile station (102) has powered down due to low battery without enough time to send a power down registration to the wireless network (104).

Claims

1. In a wireless communication network, a method of expeditiously releasing network resources for a mobile station comprising the acts of:

receiving, from a mobile station, a message indicative of a low battery condition of the mobile station;

identifying that a lost signal condition exists between the mobile station and the wireless communication network;

failing to receive a power down registration message from the mobile station; and

despite the failure to receive the power down registration message from the mobile station, performing a response to a power down registration for the mobile station in response to receiving the message indicative of the low battery condition and identifying the lost signal condition, to thereby cause one or more network resources for the mobile station to be released.

2. The method of claim 1, further comprising:

determining that the mobile station has shut down based on receiving the message indicative of the low battery condition and identifying the lost signal condition.

3. The method of claim 1, wherein causing the network resource to be released comprises refraining from paging the mobile station when an incoming communication to the mobile station is received in the wireless communication network.

4. The method of claim 1, wherein causing the network resource to be released comprises deassigning a previously-assigned IP address for the mobile station.

5. The method of claim 1, wherein the message indicative of the low battery condition includes a timer value which defines a time duration over which a power down warning indicated by the power down warning message is valid in the wireless communication network.

6. The method of claim 1, wherein the act of identifying that the lost signal condition exists comprises identifying that the lost signal condition exists for a predetermined time period.

7. The method of claim 1, wherein the act of identifying that the lost signal condition exists comprises identifying that a loss of radio frequency (RF) signal between the mobile station and the wireless communication network exists.

8. The method of claim 1, wherein the act of identifying that the lost signal condition exists comprises identifying that a loss of data communication with the mobile station exists.

9. The method of claim 1, wherein the act of identifying that the lost signal condition exists comprises:

running a timer; and

identifying the lost signal condition upon failure to receive a regularly transmitted message from the mobile station within predetermined time period defined by the timer.

10. The method of claim 1, wherein the act of receiving the message indicative of the low battery condition comprises receiving the message while a traffic channel is established between the mobile station and the wireless communication network, the message comprising an in-traffic channel message.

11. The method of claim 1, wherein the act of receiving the message indicative of the low battery condition comprises receiving the message over one of an access channel and a common control channel.

12. A wireless network component for use in a wireless communication network, comprising:

one or more processors;

memory;

computer instructions stored in the memory;

the computer instructions being executable by the one or more processors for;

receiving, from a mobile station, a message indicative of a low battery condition of the mobile station;

identifying that a lost signal condition exists between the mobile station and the wireless communication network; and

failing to receive a power down registration message from the mobile station; and

performing a response to a power down registration for the mobile station in response to receiving the message indicative of the low battery condition and identifying the lost signal condition, to thereby cause one or more network resources for the mobile station to be released.

13. The wireless network component of claim 12, wherein the computer instructions are further executable by the one or more processors for:

determining that the mobile station has powered down in response to receiving the message indicative of the low battery condition and identifying the lost signal condition.

14. The wireless network component of claim 12, wherein causing the network resource to be released comprises refraining from paging the mobile station when an incoming communication to the mobile station is received in the wireless communication network.

15. The wireless network component of claim 12, wherein causing the network resource to be released comprises deassigning a previously-assigned IP address for the mobile station.

16. The wireless network component of claim 12, wherein the message indicative of the low battery condition includes a timer value which defines a time duration over which a power down warning indicated by the message is valid in the wireless communication network.

17. The wireless network component of claim 12, wherein identifying that the lost signal condition exists comprises identifying that the lost signal condition exists for a predetermined time period.

18. The wireless network component of claim 12, wherein identifying that the lost signal condition exists comprises identifying that a loss of radio frequency (RF) signal between the mobile station and the wireless communication network exists.

19. The wireless network component of claim 12, wherein identifying that the lost signal condition exists comprises identifying that a loss of data communication with the mobile station exists.

20. The wireless network component of claim 12, wherein identifying that the lost signal condition exists comprises

running a timer;

and

identifying the lost signal condition upon failure to receive a regularly transmitted message from the mobile station within a predetermined time period defined by the timer.

21. The wireless network component of claim 12, wherein receiving the message indicative of the low battery condition comprises receiving the message while a traffic channel is established between the mobile station and the wireless communication network, the message comprising an in-traffic channel message.

22. The wireless network component of claim 12, wherein receiving the message indicative of the low battery condition comprises receiving the message over one of an access channel and a common control channel.

23. In a mobile station, a method of expeditiously releasing network resources in a wireless communication network comprising:

identifying that a low battery condition exists;

in response to identifying the low battery condition, causing a message indicative of the low battery condition to be sent to the wireless communication network;

after causing the message indicative of the low battery condition to be sent, receiving insufficient power through a battery interface of the mobile station so as to unintentionally power down without sufficient time to cause a power down registration message to be sent to the wireless communication network; and

wherein the message indicative of the low battery condition indicates to the wireless communication network to perform a power down registration for the mobile station when a lost signal condition for the mobile station is identified despite a failure of the wireless communication network to receive the power down registration message from the mobile station.

24. The method of claim 23, wherein the includes a timer value which defines a time duration over which a power down warning indicated by the message is valid in the wireless communication network.

25. The method of claim 23, further comprising:

regularly causing the message indicative of the low battery condition to be sent to the wireless communication network within a predetermined time period.

26. The method of claim 23,

wherein the message indicative of the low battery condition further indicates to the wireless communication network to refrain from paging the mobile station when an incoming communication to the mobile station is received in the wireless communication network.

27. The method of claim 23, wherein the message indicative of the low battery condition comprises an in-traffic channel message.

28. The method of claim 23, wherein causing the message indicative of the low battery condition to be sent comprises causing the message to be sent while a traffic channel is established between the mobile station and the wireless communication network.

29. The method of claim 23, wherein the message indicative of the low battery condition is sent over one of an access channel and a common control channel.

30. The method of claim 23,

wherein the message indicative of the low battery condition further indicates to the wireless communication network to deassign a previously-assigned IP address for the mobile station.

31. The method of claim 23, wherein the low battery condition comprises a first low battery condition, the method further comprising:

identifying that a second low battery condition exists; and

in response to identifying the second low battery condition, causing a packet data rate reduction message to be sent to the wireless communication network.

32. The method of claim 23, wherein the low battery condition comprises a first low battery condition, the method further comprising:

identifying that a second low battery condition exists; and

in response to identifying the second low battery condition, causing a power down procedure to be performed which includes sending a power down registration or indication to the wireless communication network.

33. A mobile station, comprising:

a wireless transceiver;

an antenna coupled to the wireless transceiver;

one or more processors coupled to the wireless transceiver;

a battery interface to provide coupling to one or more batteries which supply power to the mobile station;

battery sensing circuitry coupled to the battery interface;

the one or more processors being operative to;

identify that a low battery condition exists;

in response to identifying the low battery condition, cause a message indicative of the low battery condition to be sent through the wireless transceiver to the wireless communication network;

after causing the message indicative of the low battery condition to be sent, receive insufficient power through the battery interface so as to unintentionally power down without sufficient time to cause a power down registration message to be sent through the wireless transceiver to the wireless communication network; and

wherein the message indicative of the low battery condition indicates to the wireless communication network to perform a power down registration for the mobile station when a lost signal condition for the mobile station is identified despite a failure of the wireless communication network to receive the power down registration message from the mobile station.

34. The mobile station of claim 33, wherein the message indicative of the low battery condition includes a timer value which defines a time duration over which a power down warning indicated by the message is valid in the wireless communication network.

35. The mobile station of claim 33, wherein the one or more processors are further operative to regularly causing cause the message indicative of the low battery condition to be sent to the wireless communication network within a predetermined time period.

36. The mobile station of claim 33, wherein the message indicative of the low battery condition further causes the wireless communication network to refrain from paging the mobile station when an incoming communication to the mobile station is received in the wireless communication network.

37. The mobile station of claim 33, wherein the message indicative of the low battery condition comprises an in-traffic channel message.

38. The mobile station of claim 33, wherein causing the message indicative of the low battery condition to be sent comprises causing the message to be sent while a traffic channel is established between the mobile station and the wireless communication network.

39. The mobile station of claim 33, wherein the message indicative of the low battery condition is transmitted over one of an access channel and a common control channel.

40. The mobile station of claim 33,

wherein the message indicative of the low battery condition further indicates to the wireless communication network to deassign a previously-assigned IP address for the mobile station.

41. The mobile station of claim 33, wherein the low battery condition comprises a first low battery condition, the one or more processors being further operative to:

identify that a second low battery condition exists; and

in response to identifying the second low battery condition, cause a packet data rate reduction message to be sent to the wireless communication network.

42. The mobile station of claim 33, wherein the low battery condition comprises a first low battery condition, the one or more processors being further operative to:

identify that a second low battery condition exists; and

in response to identifying the second low battery condition, cause a power down procedure to be performed which includes sending a power down registration to the wireless communication network.