Methods and apparatus for acquiring service from a more desirable communication system

• US 7,433,689 B2
• Filed: 12/10/2002
• Issued: 10/07/2008
• Est. Priority Date: 12/10/2002
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ishii, Atsushi
• Primary Examiner(s): GESESSE, TILAHUN
• Application Number:
  US10/315,619
• Publication Number:
  US 20040110523A1
• Time in Patent Office: 2,128 Days
• Field of Search: 455/435.2, 455/517, 455/428, 455/426, 455/434, 455/415, 455/552, 455/552.1, 455/426.1, 455/422, 455/419, 455/435.1, 455/551, 370/349
• US Class Current: 455/434
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data

Abstract

A method for acquiring service from a more desirable wireless communication system while receiving service from a less desirable communication system is provided. The method may include acquiring service from a first communication system. The method may then involve waiting for a reattempt period that is related to a likelihood of acquiring service from a more desirable communication system. The method may then involve attempting to acquire service from a second communication system that is more desirable than the first communication system.

Claims

1. In a wireless communication device, a method comprising:

determining a success rate of acquisition attempts made while the wireless communication device is receiving service from a first communication system;

while receiving service from the first communication system, repeatedly attempting to acquire service from a more desirable communication system, wherein the wireless communication device waits for a reattempt period between successive acquisition attempts, and wherein the reattempt period is associated with the first communication system; and

changing the reattempt period that is associated with the first communication system based on the success rate of previous acquisition attempts made while the wireless communication device is receiving service from the first communication system, wherein changing the reattempt period comprises decreasing the reattempt period as the success rate increases and increasing the reattempt period as the success rate decreases.

2. The method of claim 1, wherein determining the success rate of previous acquisition attempts comprises:

determining how many successful acquisition attempts have been made while the mobile device is receiving service from the communication system;

determining how many total acquisition attempts have been made while the mobile device is receiving service from the communication system; and

dividing the successful acquisition attempts by the total acquisition attempts.

3. The method of claim 2, further comprising updating the success rate after each attempt to acquire service from the second communication system.

4. The method of claim 3, wherein changing the reattempt period comprises:

determining that the total acquisition attempts that have been made while the mobile device is receiving service from the communication system exceeds a threshold value;

identifying a success rate range that corresponds to the success rate of acquisition attempts made while the wireless communication device is receiving service from the first communication system; and

identifying a value for the reattempt period that corresponds to the success rate range.

5. The method of claim 1, wherein changing the reattempt period comprises:

decreasing the reattempt period as the success rate increases; and

increasing the reattempt period as the success rate decreases.

6. The method of claim 1, wherein the wireless communication device is mobile.

7. In a mobile wireless communication device located in a geographical region, a method comprising:

acquiring service from a first communication system that is not the most desirable communication system in the geographical region;

determining a success rate of acquisition attempts made while the wireless communication device is receiving service from the first communication system;

while receiving service from the first communication system, repeatedly attempting to acquire service from a second communication system that is more desirable than the first communication system and that is capable of providing service within the geographical region, wherein the wireless communication device waits for a reattempt period between successive acquisition attempts, and wherein the reattempt period is associated with the first communication system; and

changing the reattempt period that is associated with the first communication system based on the success rate of previous acquisition attempts made while the wireless communication device is receiving service from the first communication system, wherein changing the reattempt period comprises decreasing the reattempt period as the success rate increases and increasing the reattempt period as the success rate decreases.

8. The method of claim 7, wherein the previous acquisition attempts were made while the wireless communication device was receiving service from the first communication system.

9. The method of claim 7, wherein the first communication system comprises a base station, wherein acquiring service from the first communication system comprises establishing communication with the base station, and wherein the previous acquisition attempts were made while the wireless communication device was in communication with the base station.

10. The method of claim 7, further comprising updating the success rate after each attempt to acquire service from the second communication system.

11. The method of claim 7, wherein changing the reattempt period comprises:

identifying a predetermined reattempt period that is associated with a range of success rates that encompasses the success rate; and

changing the reattempt period to match the predetermined reattempt period.

12. The method of claim 7, wherein the reattempt period is only changed if the number of acquisition attempts made by the mobile wireless communication device under similar circumstances exceeds a threshold value.

13. A wireless communication device, comprising:

an antenna configured to send and receive wireless communication signals;

a transceiver in electronic communication with the antenna;

modulation and processing circuitry in electronic communication with the transceiver; and

a system acquisition module in electronic communication with the transceiver, the system acquisition module being configured to;

determine a success rate of acquisition attempts made while the wireless communication device is receiving service from a first communication system;

while receiving service from the first communication system, repeatedly attempt to acquire service from a more desirable communication system, wherein the wireless communication device waits for a reattempt period between successive acquisition attempts, and wherein the reattempt period is associated with the first communication system; and

change the reattempt period that is associated with the first communication system based on the success rate of previous acquisition attempts made while the wireless communication device is receiving service from the first communication system, wherein changing the reattempt period comprises decreasing the reattempt period as the success rate increases and increasing the reattempt period as the success rate decreases.

14. The device of claim 13, wherein the first communication system comprises a base station, wherein acquiring service from the first communication system comprises establishing communication with the base station.

15. The device of claim 13, wherein the method further comprises updating the success rate after each attempt to acquire service from the second communication system.

16. The device of claim 15, wherein updating the success rate comprises:

increasing the success rate when the wireless communication device successfully acquires service from the second communication system; and

decreasing the success rate when the wireless communication device does not successfully acquire service from the second communication system.

17. The device of claim 13, wherein changing the reattempt period comprises:

decreasing the reattempt period as the success rate increases; and

increasing the reattempt period as the success rate decreases.

18. The device of claim 13, wherein the wireless communication device is mobile.

19. A mobile wireless communication device located in a geographical region, comprising:

an antenna configured to send and receive wireless communication signals;

a transceiver in electronic communication with the antenna;

modulation and processing circuitry in electronic communication with the transceiver; and

a system acquisition module in electronic communication with the transceiver, the system acquisition module being configured to;

acquire service from a first communication system that is not the most desirable communication system in the geographical region;

determine a success rate of acquisition attempts made while the wireless communication device is receiving service from the first communication system;

while receiving service from the first communication system, repeatedly attempt to acquire service from a second communication system that is more desirable than the first communication system and that is capable of providing service within the geographical region, wherein the wireless communication device waits for a reattempt period between successive acquisition attempts, and wherein the reattempt period is associated with the first communication system; and

change the reattempt period that is associated with the first communication system based on the success rate of previous acquisition attempts made while the wireless communication device is receiving service from the first communication system, wherein changing the reattempt period comprises decreasing the reattempt period as the success rate increases and increasing the reattempt period as the success rate decreases.

20. The device of claim 19, wherein the previous acquisition attempts were made while the wireless communication device was receiving service from the first communication system.

21. The device of claim 19, wherein the first communication system comprises a base station, wherein acquiring service from the first communication system comprises establishing communication with the base station, and wherein the previous acquisition attempts were made while the wireless communication device was in communication with the base station.

22. The device of claim 19, wherein the method further comprises updating the success rate after each attempt to acquire service from the second communication system.

23. The device of claim 19, wherein changing the reattempt period comprises:

identifying a predetermined reattempt period that is associated with a range of success rates that encompasses the success rate; and

changing the reattempt period to match the predetermined reattempt period.

24. The device of claim 19, wherein the reattempt period is only changed if the number of acquisition attempts made by the mobile wireless communication device under similar circumstances exceeds a threshold value.