Patent US7480307B2 successfully refreshed from Google Patents.
US7480307B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protocol to determine optimal target access routers for seamless IP-level handover
Assignee: Nokia Technologies Oy
•
Filing: 2004-12-22
•
Granted: 2009-01-20
•
Expires: 2024-12-22
Abstract
Abstract An apparatus and method is provided for facilitating the seamless handoff of IP connections between access routers in an IP network. The mobile IP network includes two or more access routers each serving a different geographic service area. When a mobile terminal moves from the first service area to the second service area, the mobile terminal transmits to the second access router the IP address of the previous access router. The second access router uses this information to learn capabilities of the first access router (e.g., bandwidths supported, security schemes, and the like) for use in future handoff decisions, and exchanges capability information with the first access router. The assumption is made based on the exchanged information that the access routers are geographically proximate. When another mobile terminal transitions from one service area to another, the system selects an optimal target access router based on the previously learned information, including the inferred geographic proximity between access routers.
Inventors
- 👤 Hemant M. Chaskar
- 👤 Dirk Trossen
- 👤 Govind Krishnamurthi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:49
CPC Classifications
H; H04; H04W; H04W12/00; H04W12/12; H04W12/121; H04W12/122; H04W12/126; H04W36/00; H04W36/0005; H04W36/0011; H04W36/0019; H04L; H04L63/00; H04L63/14; H04L63/1441; H04L63/1458; H04W36/24; H04W36/26; H04W40/00; H04W40/34; H04W40/36; H04W48/00; H04W48/16; H04W48/17; H04W80/00; H04W80/04; H04W88/00; H04W88/005
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
132 words
An apparatus comprising: a processor that executes computer-readable instructions, and a memory storing the computer-readable instructions that, when executed, causes the apparatus to receive from a first mobile terminal an IP address of an access router for the service area from which the first mobile terminal is leaving; use the IP address of the access router to discover capabilities of the access router; store capabilities of the access router in a capabilities map that maps each of a plurality of access routers that are geographically adjacent to capabilities of each access router in a mobile IP network; and in response to a request to perform a handoff of an IP service involving a second mobile terminal, select an optimum access router for the handoff on the basis of the stored capabilities map.
Claim 2
Independent Claim
132 words
An apparatus comprising: a processor that executes computer-readable instructions, and a memory storing the computer-readable instructions that, when executed, causes the apparatus to receive from a first mobile terminal an IP address of an access router for the service area from which the first mobile terminal is leaving; use the IP address of the access router to discover capabilities of the access router; store capabilities of the access router in a capabilities map that maps each of a plurality of access routers that are geographically adjacent to capabilities of each access router in a mobile IP network; and in response to a request to perform a handoff of an IP service involving a second mobile terminal, select an optimum access router for the handoff on the basis of the stored capabilities map.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 , wherein the memory comprises computer-executable instructions that, when executed, causes the apparatus to compare capabilities requirements received from the second mobile terminal with the capabilities map.
Claim 4
Dependent Claim
33 words
The apparatus of claim 2 , wherein the memory comprises computer-executable instructions that, when executed, causes the apparatus to find an optimum access router by comparing the stored capabilities map with a policy.
Claim 5
Dependent Claim
33 words
The apparatus of claim 1 , wherein the memory comprises computer-executable instructions that, when executed, causes the apparatus to find an optimum access router by comparing the stored capabilities map with a policy.
Claim 6
Dependent Claim
31 words
The apparatus of claim 1 , wherein the computer-readable instructions, when executed, causes the apparatus to initiate an exchange of access router capabilities between at least two geographically adjacent access routers.
Claim 7
Independent Claim
153 words
A method comprising: at a first access router for the service area of which a first mobile terminal is entering, receiving from the first mobile terminal an IP address of a second access router for the service area from which the first mobile terminal is leaving; at the first access router, using the IP address of the second access router to discover capabilities of the second access router; storing capabilities of the second access router in a capabilities map in the first access router that maps each of a plurality of access routers that are geographically adjacent to capabilities of each access router in a mobile IP network; and at the first access router, in response to a request to perform a handoff of an IP service involving a second mobile terminal, selecting by the first access router an optimum access router for the handoff on the basis of the stored capabilities map.
Claim 8
Independent Claim
153 words
A method comprising: at a first access router for the service area of which a first mobile terminal is entering, receiving from the first mobile terminal an IP address of a second access router for the service area from which the first mobile terminal is leaving; at the first access router, using the IP address of the second access router to discover capabilities of the second access router; storing capabilities of the second access router in a capabilities map in the first access router that maps each of a plurality of access routers that are geographically adjacent to capabilities of each access router in a mobile IP network; and at the first access router, in response to a request to perform a handoff of an IP service involving a second mobile terminal, selecting by the first access router an optimum access router for the handoff on the basis of the stored capabilities map.
Claim 9
Dependent Claim
26 words
The method of claim 6 , further comprising comparing by the first access router capabilities requirements received from the second mobile terminal with the capabilities map.
Claim 10
Dependent Claim
27 words
The method of claim 7 , further comprising finding by the first access router an optimum access router by comparing the stored capabilities map with a policy.
Claim 11
Dependent Claim
27 words
The method of claim 6 , further comprising finding by the first access router an optimum access router by comparing the stored capabilities map with a policy.
Claim 12
Dependent Claim
26 words
The method of claim 6 , further comprising at the first access router, transmitting the capabilities of the first access router to the second access router.
Claim 13
Dependent Claim
128 words
A computer-readable medium encoded with computer-readable instructions that when executed by a data processing device, performs a method comprising: receiving from a first mobile terminal an IP address of an access router for the service area from which the first mobile terminal is leaving; using the IP address of the access router to discover capabilities of the access router; storing capabilities of the access router in a capabilities map that maps each of a plurality of access routers that are geographically adjacent to capabilities of each access router in a mobile IP network; and in response to a request to perform a handoff of an IP service involving a second mobile terminal, selecting an optimum access router for the handoff on the basis of the stored capabilities map.
Claim 14
Dependent Claim
128 words
A computer-readable medium encoded with computer-readable instructions that when executed by a data processing device, performs a method comprising: receiving from a first mobile terminal an IP address of an access router for the service area from which the first mobile terminal is leaving; using the IP address of the access router to discover capabilities of the access router; storing capabilities of the access router in a capabilities map that maps each of a plurality of access routers that are geographically adjacent to capabilities of each access router in a mobile IP network; and in response to a request to perform a handoff of an IP service involving a second mobile terminal, selecting an optimum access router for the handoff on the basis of the stored capabilities map.
Claim 15
Dependent Claim
26 words
The computer-readable medium of claim 11 , wherein the computer-readable instructions, when executed, compares capabilities requirements received from the second mobile terminal with the capabilities map.
Claim 16
Dependent Claim
27 words
The computer-readable medium of claim 12 , wherein the computer-readable instructions, when executed, finds an optimum access router by comparing the stored capabilities map with a policy.
Claim 17
Dependent Claim
27 words
The computer-readable medium of claim 11 , wherein the computer-readable instructions, when executed, finds an optimum access router by comparing the stored capabilities map with a policy.
Claim 18
Dependent Claim
43 words
The computer-readable medium of claim 11 , wherein the computer-readable medium is encoded with computer-readable instructions that when executed by the data processing device, performs a method comprising initiating an exchange of access router capabilities between at least two geographically adjacent access routers.
References Cited (Backward Citations)
US6360264B1
Cited
EP0589552A2
Cited
US5822313A
Cited
US6088587A
Cited
US6421714B1
Cited
US6160804A
Cited
US6654359B1
Cited
US6434134B1
Cited
CA2287786A1
Cited
US6763007B1
Cited
US20020031107A1
Cited
US20020131386A1
Cited
US20020105926A1
Cited
US20020141360A1
Cited
US20020168980A1
Cited
US7313628B2
Cited
US6928282B2
Cited
US20030092444A1
Cited
US6798773B2
Cited
US20030142651A1
Cited
US7224677B2
Cited
US20030227911A1
Cited
JP2004229276A
Cited
US20040165551A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2012-01-20 | 2012-07-21 | 2013-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2016-01-20 | 2016-07-21 | 2017-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2020-01-20 | 2020-07-21 | 2021-01-20 | $7700.00 | Window Closed / Lapsed |