Method and system for intersystem wireless communication session arbitration

• US 6,879,600 B1
• Filed: 08/30/2002
• Issued: 04/12/2005
• Est. Priority Date: 06/03/2002
• Status: Expired due to Term

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Delker, Jason, Jones, Bryce A.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): ABELSON, RONALD B
• Application Number:
  US10/233,247
• Time in Patent Office: 956 Days
• Field of Search: 370/310, 370/328, 370331-332, 370/389, 370/392, 370/437, 370/465, 370/466, 370/313, 370/314, 370/329, 370/333, 370340-341, 370352-357, 370/360, 370/401, 370464-467, 455436-440
• US Class Current: 370/466
• CPC Class Codes: H04L 63/104 Grouping of entities
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface

Abstract

A mobile station provides arbitration and hand-off between two or more differently formatted computer and/or telecommunication networks. To facilitate the mobile station arbitration and hand-off, the mobile station operates at a given location in which it can communicate according to a first protocol via a first-access system and at which it can communicate according to a second protocol via a second-access system. At the given location, the mobile station arbitrates between communicating real-time media according to the first protocol via the first-access system and communicating real-time media according to the second protocol over the first protocol via the second-access system.

To carry out the arbitration, mobile station may be provisioned with one or more arbitration policies. Based on these arbitration policies, the mobile station commits resources to carry on a communication session via a selected access system. When the arbitration policies comprise a preferred-network attribute, such as a preferred-network threshold, the mobile station arbitration may be performed by a comparison function. This comparison function may include ascertaining a preferred-network metric and communicating voice content according to the first protocol via the first-access system when the preferred-network metric surpasses the preferred-network threshold or communicating voice content according to the second protocol over the first protocol via the second-access system when the preferred-network metric does not surpass the preferred-network threshold.

Claims

1. A method comprising:

(a) a mobile station operating at a given location at which the mobile station can communicate according to a first protocol via a first-access system and at which the mobile station can communicate according to a wireless-local-area-network (WLAN) protocol via a second-access system; and

(b) while the mobile station is operating at the given location, the mobile station arbitrating between communicating voice content according to the first protocol via the first-access system and communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system.

2. The method of claim 1, further comprising:

the mobile station communicating voice content according to the first-protocol in a coverage area of the first-access system;

making a determination that the mobile station has moved to the given location; and

performing element (b) in response to the determination that the mobile station has moved into the given location.

3. The method of claim 2, further comprising:

making a determination that the mobile station has moved from the given location; and

ceasing to perform element (b) in response to the determination that the mobile station has moved from the given location.

4. The method of claim 2, wherein the mobile station makes the determination that it has moved to the given location.

5. The method of claim 1, further comprising:

the mobile station communicating voice content according to the wireless-local-area-network protocol in a coverage area of the second-access system;

making a determination that the mobile station has moved to the given location; and

performing element (b) in response to the determination that the mobile station has moved into the given location.

6. The method of claim 5, further comprising:

making a determination that the mobile station has moved from the given location; and

ceasing to perform element (b) in response to the determination that the mobile station has moved from the given location.

7. The method of claim 5, wherein the mobile station makes the determination that it has moved to the given location.

8. The method of claim 1, further comprising:

the mobile station communicating voice content according to the wireless-local-area-network protocol encapsulating the first protocol in a coverage area of the second-access system;

determining that the mobile station has moved to the given location; and

performing element (b) in response to the determination that the mobile station has moved into the given location.

9. The method of claim 8, further comprising:

making a determination that the mobile station has moved from the given location; and

ceasing to perform element (b) in response to the determination that the mobile station has moved from the given location.

10. The method of claim 8, wherein the mobile station makes the determination that it has moved to the given location.

11. The method of claim 1, wherein the mobile station is provisioned to carry out at least one arbitration policy, and wherein element (b) comprises,

the mobile station arbitrating between communicating voice content according to the first protocol via the first-access system and communicating voice content according to the wireless-local-area-network protocol encapsulating the first protocol via the second-access system based on the at least one arbitration policy.

12. The method of claim 11, further comprising the mobile station receiving user input (e.g., selection) to define the at least one arbitration policy.

13. The method of claim 11, wherein the at least one arbitration policy comprises an attribute selected from the group consisting of class-of-service attributes, quality-of-service attributes, and preferred-network attributes.

14. The method of claim 11, wherein the at least one arbitration policy comprises a preferred-network threshold, and wherein the mobile station arbitrating between communicating voice content according to the first protocol via the first-access system and communicating voice content according to the wireless-local-area-network protocol encapsulating the first protocol via the second-access system based on the at least one arbitration policy comprises a comparison function that comprises:

ascertaining a preferred-network metric; and

communicating voice content according to the first protocol via the first-access system when the preferred-network metric surpasses the preferred-network threshold.

15. The method of claim 14, wherein the ascertaining a preferred-network metric comprises the mobile station receiving from the first-access system a preferred-network metric.

16. The method of claim 14, wherein the ascertaining a preferred-network metric comprises the mobile station receiving from the second-access system a preferred-network metric.

17. The method of claim 14, wherein the comparison function is selected from the group consisting of:

(i) ascertaining a first-cost-of-service metric for the first-access system and responsively communicating voice content according to the first protocol via the first-access system when the first-cost-of-service metric surpasses a first-cost-of service threshold;

(ii) ascertaining a first-transmission-rate metric for the first-access system and responsively communicating voice content according to the first protocol via the first-access system when the first-transmission-rate metric surpasses a first-transmission-rate threshold;

(iii) ascertaining a first-security metric for the first-access system and responsively communicating voice content according to the first protocol via the first-access system when the first-security metric surpasses a first-security threshold;

(iv) ascertaining a first-traffic-volume metric for the first-access system and responsively communicating voice content according to the first protocol via the first-access system when the first-traffic-volume metric surpasses a first-traffic-load threshold;

(v) ascertaining a first-signal-strength metric for the fist-access system and responsively communicating voice content according to the first protocol via the first-access system when the first-signal-strength metric surpasses a first-signal-strength threshold;

(vi) ascertaining a second-cost-of-service metric for the second-access system and responsively communicating voice content according to the first protocol via the first-access system when the second-cost-of-service metric surpasses a second-cost-of service threshold;

(vii) ascertaining a second-transmission-rate metric for the second-access system and responsively communicating voice content according to the first protocol via the first-access system when the second-transmission-rate metric surpasses a second-transmission-rate threshold;

(viii) ascertaining a second-security metric for the second-access system and responsively communicating voice content according to the first protocol via the first-access system when the second-security metric surpasses a second-security threshold;

(ix) ascertaining a second-traffic-volume metric for the second-access system and responsively communicating voice content according to the first protocol via the first-access system when the second-traffic-volume metric surpasses a second-traffic-load threshold; and

(x) ascertaining a second-signal-strength metric for the second-access system and responsively communicating voice content according to the first protocol via the first-access system when the second-signal-strength metric surpasses a second-signal-strength threshold.

18. The method of claim 11, wherein the at least one arbitration policy comprises a preferred-network threshold, and wherein the mobile station arbitrating between communicating voice content according to the first protocol via the first-access system and communicating voice content according to the wireless-local-area-network (WLAN) protocol encapsulating the first protocol via the second-access system based on the at least one arbitration policy comprises a comparison function that comprises:

ascertaining a preferred-network metric; and

communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the preferred-network metric does not surpass the preferred-network threshold.

19. The method of claim 18, wherein ascertaining a preferred-network metric comprises the mobile station receiving from the first-access system a preferred-network metric.

20. The method of claim 18, wherein the ascertaining a preferred-network metric comprises the mobile station receiving from the second-access system a preferred-network metric.

21. The method of claim 18, wherein the comparison function is selected from the group consisting of:

(i) ascertaining a first-cost-of-service metric for the first-access system and responsively communicating voice content according to the wireless-local-area-network (WLAN) protocol encapsulating the first protocol via the second-access system when the first-cost-of-service metric does not surpass a first-cost-of service threshold;

(ii) ascertaining a first-transmission-rate metric for the first-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the first-transmission-rate metric does not surpass a first-transmission-rate threshold,

(iii) ascertaining a first-security metric for the first-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the first-security metric does not surpass a first-security threshold;

(iv) ascertaining a first-traffic-volume metric for the first-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the first-traffic-volume metric does not surpass a first-traffic-load threshold;

(v) ascertaining a first-signal-strength metric for the first-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the first-signal-strength metric does not surpass a first-signal-strength threshold;

(vi) ascertaining a second-cost-of-service metric for the second-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the second-cost-of-service metric does not surpass a second-cost-of service threshold;

(vii) ascertaining a second-transmission-rate metric for the second-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the second-transmission-rate metric does not surpass a second-transmission-rate threshold;

(viii) ascertaining a second-security metric for the second-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the second-security metric does not surpass a second-security threshold;

(ix) ascertaining a second-traffic-volume metric for the second-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the second-system-traffic-volume metric does not surpass a second-traffic-load threshold; and

(x) ascertaining a second-signal-strength metric for the second-access system and responsively communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the second-signal-strength metric does not surpass a second-signal-strength threshold.

22. The method of claim 11, wherein the at least one arbitration policy comprises a preferred-network threshold, and wherein the mobile station arbitrating between communicating voice content according to the first protocol via the first-access system and communicating voice content according to the wireless-local-area-network (WLAN) protocol encapsulating the first protocol via the second-access system based on the at least one arbitration policy comprises a comparison function that comprises:

ascertaining a first-preferred-network metric;

ascertaining a second-preferred-network metric;

comparing the first-preferred-network metric to the second-preferred-network metric so as to produce a relative-preferred-network metric;

communicating voice content according to the first protocol via the first-access system when the relative-preferred-network metric surpasses the preferred-network threshold; and

communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the relative-preferred-network metric does not surpass the preferred-network threshold.

23. The method of claim 22, wherein the ascertaining a first-preferred-network metric comprises the mobile station receiving from the first-access system a preferred network metric.

24. The method of claim 22, wherein the ascertaining a second-preferred-network metric comprises the mobile station receiving from the second-access system a preferred-network metric.

25. The method of claim 22, wherein the comparison function is selected from the group consisting of:

(i) ascertaining a first-cost-of-service metric for the first-access system, ascertaining a second-cost-of-service metric for the second access system,

comparing the first-cost-of-service metric to the second-cost-of-service metric so as to produce a relative-cost-of-service metric,

communicating voice content according to the fist protocol via the first-access system when the relative-cost-of-service metric surpasses a relative-cost-of service threshold, and

communicating voice content according to the wireless-local-area-network (WLAN) protocol encapsulating the first protocol via the second-access system when the relative-cost-of-service metric does not surpass the relative-cost-of service threshold;

(ii) ascertaining a first-transmission-rate metric for the first-access system,

ascertaining a second-transmission-rate metric for the second access system,

comparing the first-transmission-rate metric to the second-transmission-rate metric so as to produce a relative-transmission-rate metric,

communicating voice content according to the first protocol via the first-access system when the relative-transmission-rate metric surpasses a relative-transmission-rate threshold, and

communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the relative-transmission-rate metric does not surpass the relative-transmission-rate threshold;

(iii) ascertaining a first-security metric for the first-access system,

ascertaining a second-security metric for the second access system,

comparing the first-security metric to the second-security metric so as to produce a relative-security metric,

communicating voice content according to the first protocol via the first-access system when the relative-security metric surpasses a relative-security threshold, and

communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the relative-security metric does not surpass the relative-security threshold;

(iv) ascertaining a first-traffic-volume metric for the first-access system,

ascertaining a second-traffic-volume metric for the second access system,

comparing the first-traffic-volume metric to the second-traffic-volume metric so as to produce a relative-traffic-volume metric,

communicating voice content according to the first protocol via the first-access system when the relative-traffic-volume metric surpasses a load-balancing threshold, and

communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the relative-traffic-volume metric does not surpass the load-balance threshold;

(v) ascertaining a first-signal-strength metric for the first-access system,

ascertaining a second-signal-strength for the second access system,

comparing the first-signal-strength metric to the second-signal-strength metric so as to produce a relative-signal-strength metric,

communicating voice content according to the first protocol via the first-access system when the relative-signal-strength metric surpasses a relative-signal-strength threshold, and

communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the relative-signal-strength metric does not surpass the relative-signal-strength threshold.

38. The method of claim 1, wherein the wireless-local-area-network protocol comprises a protocol for carrying out communications in an unlicensed radio frequency spectrum.

26. A mobile station comprising at least one logic module having logic to:

(a) operate at a given location at which the mobile station can communicate according to a first protocol via a first-access system and at which the mobile station can communicate according to a wireless-local-area-network (WLAN) protocol via a second-access system; and

(b) arbitrate between communicating voice content according to the first protocol via the first-access system and communicating voice content according to the WLAN protocol encapsulating the first protocol via the second-access system when the mobile station is at the given location.

27. The mobile station of claim 26, wherein the logic module further comprises logic to:

communicate voice content according to the first-protocol in a coverage area of the first-access system;

determine that the mobile station has moved to the given location; and

perform element (b) in response to the determination that the mobile station has moved into the given location.

28. The method of claim 26, wherein the mobile station is provisioned to carry out at least one arbitration policy, and wherein element (b) comprises:

arbitrating between communicating voice content according to the first protocol via the first-access system and communicating voice content according to the wireless-local-area-network protocol encapsulating the first protocol via the second-access system based on the at least one arbitration policy.

29. The mobile station of claim 26, wherein the at least one logic module comprises:

a first-logic module for coding/decoding the voice content according to the first protocol so as to produce first-protocol encoded/decoded voice content;

a second-logic module for communicating the first-protocol encoded/decoded voice content via the first-access system;

a third-logic module for encapsulating first-protocol encoded/decoded voice content in headers of the wireless-local-area-network (WLAN) protocol so as to produce second-protocol-encapsulated-first-protocol encoded/decoded voice content;

a fourth-logic module for communicating the WLAN-protocol-encapsulated-first-protocol encoded/decoded voice content; and

a fifth-logic module for arbitrating between the second logic module and the fourth logic module.

30. The mobile station of claim 29, wherein

the first-logic module is an air-interface coder/decoder module for a first wireless network.

the second-logic module is an air interface transceiver module for the first wireless network;

the third-logic module is a wireless-local-area-network-protocol-encapsulating module for a second wireless network; and

the fourth-logic module is an air interface transceiver module for the second wireless network.

31. The mobile station of claim 29, wherein the

the first-logic module comprises a coder/decoder selected from the group consisting of an enhanced variable rate coder, Adaptive Code-Excited Linear Predictive coder/decoder, Code-Division-Multiple-Access (CDMA) Qualcomm Code-Excited Linear Predictive coder/decoder, a Selective Mode Vocoder coder/decoder, CDMA4000-SMV coder/decoder, and an Adaptive Multirate Global-System-for-Mobile-Communications (GSM) coder/decoder;

the second-logic module comprises a transceiver selected from the group consisting of a CDMA transceiver, a Time-Division-Multiple-Access transceiver, a Wideband-CDMA transceiver, a CDMA2000 transceiver, GSM transceiver;

the third-logic module comprises an encapsulating module selected from the group consisting of an Internet Protocol encapsulating module, an X.25 encapsulating module, a Frame Relay encapsulating module, Generic Routing Encapsulating module and a Signaling System 7 encapsulating module; and

the fourth-logic module comprises a transceiver selected from the group consisting of an IEEE 802.11 transceiver, and a Bluetooth transceiver.

39. The mobile station of claim 26, wherein the wireless-local-area-network protocol comprises a protocol for carrying out communications in an unlicensed radio frequency spectrum.

32. A method comprising:

(a) a mobile station operating at a given location at which the mobile station can communicate according to a first protocol via a first-access system and at which the mobile station can communicate according to a wireless-local-area-network (WLAN) protocol via a second-access system; and

(b) while the mobile station is operating at the given location, the mobile station arbitrating between communicating real-time media according to the first protocol via the first-access system and communicating real-time media according to the WLAN protocol encapsulating the first protocol via the second-access system.

33. The method of claim 32, further comprising:

the mobile station communicating real-time media according to the first-protocol in a coverage area of the first-access system;

making a determination that the mobile station has moved to the given location; and

performing element (b) in response to the determination that the mobile station has moved into the given location.

34. The method of claim 33, further comprising:

making a determination that the mobile station has moved from the given location; and

ceasing to perform element (b) in response to the determination that the mobile station has moved from the given location.

35. The method of claim 32, further comprising:

the mobile station communicating voice content according to the wireless-local-area-network protocol encapsulating the first protocol in a coverage area of the second-access system;

making a determination that the mobile station has moved to the given location; and

performing element (b) in response to the determination that the mobile station has moved into the given location.

36. The method of claim 35, further comprising:

making a determination that the mobile station has moved from the given location; and

ceasing to perform element (b) in response to the determination that the mobile station has moved from the given location.

37. The method of claim 32, wherein the at least one arbitration policy comprises a preferred-network threshold, and wherein the mobile station arbitrating between communicating real-time media according to the first protocol via the first-access system and communicating real-time media according to the wireless-local-area-network (WLAN) protocol encapsulating the first protocol via the second-access system based on the at least one arbitration policy comprises a comparison function that comprises:

ascertaining a first-preferred-network metric;

ascertaining a second-preferred-network metric;

comparing the first-preferred-network metric to the second-preferred-network metric so as to produce a relative-preferred-network metric;

communicating real-time media according to the first protocol via the first-access system when the relative-preferred-network metric surpasses the preferred-network threshold; and

communicating real-time media according to the WLAN protocol encapsulating the first protocol via the second-access system when the relative-preferred-network metric does not surpass the preferred-network threshold.

40. The method of claim 32, wherein the wireless-local-area-network protocol comprises a protocol for carrying out communications in an unlicensed radio frequency spectrum.