US6577868B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for performing handover in a mobile communication system
Assignee: Nokia Technologies Oy
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Filing: 2000-08-15
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Granted: 2003-06-10
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Expires: 2020-08-15
Abstract
Abstract A method and system for performing a pre-reserved handover in a mobile communciation system is suggested, wherein an additional handover preparation step is performed by determining at least one candidate base station in advance, to which handover is likely to be performed. An additional downlink connection to the at least one candidate base station is established before handover execution is performed. Thereby, proper handover can be ensured for cell environments in which a serving cell disappears very quickly from a mobile station.
Inventors
- 👤 Jukka Vialen
- 👤 Mikko J. Rinne
- 👤 Oscar Salonaho
- 👤 Niina Laaksonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:19
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/20; H04L49/201; H04L49/203; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04W; H04W36/00; H04W36/24; H04W36/32; H04W36/324; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5603; H04L2012/5604; H04L2012/5607; H04L2012/5629; H04L2012/563
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
153 words
A method for performing handover in a mobile communication system, comprising a mobile station, a plurality of base stations, switching means for connecting the base stations, and switching control means for controlling the switching means, the method comprising: performing a prediction in order to determine at least one candidate base station to which the mobile station is likely to be handed over; controlling the switching means on the basis of the prediction by the switching control means to set up a connection from the switching means to the at least one candidate base station; and transmitting connection parameters required for a connection with the mobile station to the at least one candidate base station before an access message from the mobile station is transmitted to a new serving base station selected from candidate base stations, in order to execute a handover from a current serving base station to the new serving base station.
Claim 2
Independent Claim
153 words
A method for performing handover in a mobile communication system, comprising a mobile station, a plurality of base stations, switching means for connecting the base stations, and switching control means for controlling the switching means, the method comprising: performing a prediction in order to determine at least one candidate base station to which the mobile station is likely to be handed over; controlling the switching means on the basis of the prediction by the switching control means to set up a connection from the switching means to the at least one candidate base station; and transmitting connection parameters required for a connection with the mobile station to the at least one candidate base station before an access message from the mobile station is transmitted to a new serving base station selected from candidate base stations, in order to execute a handover from a current serving base station to the new serving base station.
Claim 3
Dependent Claim
29 words
The method according to claim 1 , wherein a determination is performed via a handover prediction based on one of a moving direction and speed of the mobile station.
Claim 4
Dependent Claim
26 words
The method according to claim 1 , wherein base stations in a line-of-sight of said current serving base station are not determined as candidate base stations.
Claim 5
Dependent Claim
23 words
The method according to claim 1 , further comprising transmitting a list for identifying a candidate base station to a switching control means.
Claim 6
Dependent Claim
62 words
The method according to claim 4 , further comprising: transmitting mobile station connection parameters required for the connection with the mobile station to the switching control means; setting up a point-to-multipoint connection in a switch to a current serving base station and at least one candidate base station; and transmitting the mobile station connection parameters to at least one candidate base station.
Claim 7
Dependent Claim
25 words
The method according to claim 5 , further comprising storing downlink user data obtained by the point-to-multipoint connection in at least one candidate base station.
Claim 8
Dependent Claim
49 words
The method according to claim 5 , further comprising: transmitting connection parameters for at least one candidate base station to the current serving base station; checking whether the prediction is still valid; and transmitting candidate base station connection parameters to the mobile station, if the prediction is still valid.
Claim 9
Dependent Claim
22 words
The method according to claim 1 , further comprising transmitting a connection parameter change information to at least one candidate base station.
Claim 10
Dependent Claim
41 words
The method according to claim 8 , further comprising: transmitting a connection parameter version number to a candidate base station to which handover execution is to be performed; and performing a connection parameter update in dependence on the transmitted version number.
Claim 11
Dependent Claim
41 words
The method according to claim 8 , further comprising deleting a connection between a current serving base station and the mobile station, when a predetermined period expires without any attempt of the mobile station to contact the current serving base station.
Claim 12
Dependent Claim
38 words
The system according to claim 10 , wherein the serving base station is arranged to determine at least one candidate base station on a basis of one of a moving direction and a speed of the mobile station.
Claim 13
Dependent Claim
29 words
The system according to claim 10 , wherein storing means are provided in at least one candidate base station for storing downlink user data obtained by the point-to-multipoint connection.
Claim 14
Dependent Claim
25 words
The method according to claim 1 , wherein the prediction is based on one of a moving direction and a speed of the mobile station.
Claim 15
Dependent Claim
67 words
The method according to claim 1 , further comprising controlling the switching means by the switching control means to transmit connection parameters required for connection with at least one candidate base station to the current serving base station, and the current serving base station checks whether the prediction is still valid and transmits candidate base station connection parameters to the mobile station if the prediction remains valid.
Claim 16
Dependent Claim
26 words
The method according to claim 1 , further comprising transmitting connection parameter change information from the current base station to at least one candidate base station.
Claim 17
Dependent Claim
51 words
The method according to claim 1 , further comprising transmitting a connection parameter version number from the mobile station to a new serving base station to which handover execution is to be performed, and performing a connection parameter update at the new serving base station dependent upon the transmitted version number.
Claim 18
Dependent Claim
41 words
The method according to claim 1 , further comprising deleting a connection between the current serving base station and the mobile station when a predetermined period expires without any attempt by the mobile station to contact the current serving base station.
Claim 19
Independent Claim
189 words
A system for performing handover in a mobile communication system, comprising a mobile station, a plurality of base stations, switching means for connecting the base stations, and switching control means for controlling the switching means, wherein the plurality of base stations comprise a serving base station currently serving the mobile station, the system further comprising: the current serving base station is arranged to perform a prediction in order to determine at least one candidate base station to which a mobile station is likely to be handed over; the switching control means is arranged to receive an information indicating a result of the prediction, to control the switching means to set up a connection from the switching means to the at least one candidate base station, and to transmit connection parameters required for a connection with the mobile station to the at least one candidate base station before an access message from the mobile station is transmitted to a new serving base station selected from the at least one candidate base stations, in order to execute a handover from the current serving base station to the new serving base station.
Claim 20
Independent Claim
189 words
A system for performing handover in a mobile communication system, comprising a mobile station, a plurality of base stations, switching means for connecting the base stations, and switching control means for controlling the switching means, wherein the plurality of base stations comprise a serving base station currently serving the mobile station, the system further comprising: the current serving base station is arranged to perform a prediction in order to determine at least one candidate base station to which a mobile station is likely to be handed over; the switching control means is arranged to receive an information indicating a result of the prediction, to control the switching means to set up a connection from the switching means to the at least one candidate base station, and to transmit connection parameters required for a connection with the mobile station to the at least one candidate base station before an access message from the mobile station is transmitted to a new serving base station selected from the at least one candidate base stations, in order to execute a handover from the current serving base station to the new serving base station.
Claim 21
Dependent Claim
32 words
The system according to claim 18 , wherein the switching control means determines a candidate base station on a basis of one of a moving direction a speed of the mobile station.
Claim 22
Dependent Claim
26 words
The system according to claim 18 , wherein the switching means is arranged to set up a point-to-multipoint connection to at least one candidate base station.
Claim 23
Dependent Claim
29 words
The system according to claim 20 , further comprising storing means provided in at least one candidate base station for storing downlink user data obtained by the point-to-multipoint connection.
Claim 24
Dependent Claim
14 words
The system according to claim 18 , wherein the switching means is an ATM-switch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-06-09 | 2006-12-09 | 2007-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-06-09 | 2010-12-09 | 2011-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-06-09 | 2014-12-09 | 2015-06-10 | $7700.00 | Window Closed / Lapsed |