US6590879B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method, mobile station, basestation and mobile communications system for performing handoff independently for groups of physical direct sequence-code division multiple access channels
Assignee: Ericsson AB
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Filing: 1999-03-05
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Granted: 2003-07-08
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Expires: 2019-03-05
Abstract
Abstract A mobile station is disclosed that functions within a 3G DS-CDMA communication system, in which a separate active set is defined for each of the different channel types. With the use of a separate Fundamental Channel Active Set, Forward Link-Supplemental Channel Active Set, Reverse Link-Supplemental Channel Active Set, and Dedicated Control Channel Active Set a flexible handoff of a multi-service active session is possible. Each type of channel is capable of handing off separately, thereby allowing channels with different requirements, such as resource requirements or signal strength requirements, to be handed off at different times, to different basestations, and/or in different methods (ie. soft or hard handoff). The handoffs are initiated by a basestation controller by updating, within the mobile station and the applicable basestations, the particular active set corresponding to the physical channel requiring a handoff.
Inventors
- 👤 Wei Huang
- 👤 Ning Guo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:22
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/24; H04W36/26; H04W36/28
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
122 words
A mobile station capable of having a plurality of groups of physical channels simultaneously and of performing handoff independently for at least two of said groups of physical channels, said mobile station arranged to maintain a respective active set identifying a set of basestations to be active for each group of the at least two of said groups of physical channels, wherein changes are made to the active sets of groups which have been determined to require handoff, and a handoff is performed for each group whose active set has been changed, by the handoff of communications from the basestations previously identified by the respective active set to the basestations identified by the respective active set after the changes have been made.
Claim 2
Dependent Claim
122 words
A mobile station capable of having a plurality of groups of physical channels simultaneously and of performing handoff independently for at least two of said groups of physical channels, said mobile station arranged to maintain a respective active set identifying a set of basestations to be active for each group of the at least two of said groups of physical channels, wherein changes are made to the active sets of groups which have been determined to require handoff, and a handoff is performed for each group whose active set has been changed, by the handoff of communications from the basestations previously identified by the respective active set to the basestations identified by the respective active set after the changes have been made.
Claim 3
Dependent Claim
26 words
A mobile station according to claim 1 wherein said at least two of said groups of physical channels comprises all of said groups of physical channels.
Claim 4
Dependent Claim
20 words
A mobile station according to claim 1 , wherein each of said groups of physical channels contains one physical channel.
Claim 5
Dependent Claim
24 words
A mobile station according to claim 1 , wherein each of said groups of physical channels contains one or more channels of similar type.
Claim 6
Dependent Claim
61 words
A mobile station according to claim 1 , wherein each of the physical channels represents a link between the mobile station and one or more basestations, and wherein the basestations involved in links for a first particular group of physical channels are limited to be a subset of the basestations involved in links for a second particular group of physical channels.
Claim 7
Dependent Claim
57 words
A mobile station according to claim 1 , wherein each physical channel represents a link between the mobile station and one or more basestations, and wherein a handoff for a given group of physical channels is performed upon receipt of a message indicating a change in the basestations involved in links for that group of physical channels.
Claim 8
Dependent Claim
38 words
A mobile station according to claim 1 , wherein the groups comprise a first group that contains a fundamental channel, a second group that contains a supplemental channel, and a third group that contains a dedicated control channel.
Claim 9
Dependent Claim
46 words
A mobile station according to claim 1 , wherein the groups comprise a first group that contains a fundamental channel and a dedicated control channel, a second group that contains a forward link supplemental channel, and a third group that contains a reverse link supplemental channel.
Claim 10
Dependent Claim
50 words
A mobile station according to claim 1 , wherein the groups comprise a first group that contains a fundamental channel, a second group that contains a forward link supplemental channel, a third group that contains a reverse link supplemental channel, and a fourth group that contains a dedicated control channel.
Claim 11
Dependent Claim
21 words
A mobile station according to claim 1 arranged to operate within a third generation code division multiple access (CDMA) communication system.
Claim 12
Dependent Claim
33 words
A mobile communication system, in combination with a mobile station according to claim 1 , and further comprising one or more basestations involved in said groups of physical channels with the mobile station.
Claim 13
Dependent Claim
45 words
A mobile communication system according to claim 11 further comprising a basestation controller, coupled to the plurality of basestations, that controls handoffs by sending messages containing information allowing an identification of sets of basestations which are to maintain each of said groups of physical channels.
Claim 14
Dependent Claim
24 words
A mobile communication system according to claim 11 , wherein the communication system is a third generation code division multiple access (CDMA) communication system.
Claim 15
Dependent Claim
145 words
A basestation capable of having a plurality of groups of physical channels with a mobile station simultaneously and of performing handoff independently for at least two of the groups of physical channels, said basestation arranged to maintain a respective active set identifying a set of basestations to be active for each group of the at least two of the groups of physical channels, wherein changes are made to the active sets of groups which have been determined to require handoff, and a handoff is performed for each group whose active set has been changed, by a handoff of communications from the basestation when the basestation is no longer identified by the respective active set after the changes have been made, and by the handoff of communications to the basestation when the basestation is identified by the respective active set after the changes have been made.
Claim 16
Dependent Claim
145 words
A basestation capable of having a plurality of groups of physical channels with a mobile station simultaneously and of performing handoff independently for at least two of the groups of physical channels, said basestation arranged to maintain a respective active set identifying a set of basestations to be active for each group of the at least two of the groups of physical channels, wherein changes are made to the active sets of groups which have been determined to require handoff, and a handoff is performed for each group whose active set has been changed, by a handoff of communications from the basestation when the basestation is no longer identified by the respective active set after the changes have been made, and by the handoff of communications to the basestation when the basestation is identified by the respective active set after the changes have been made.
Claim 17
Dependent Claim
18 words
A basestation according to claim 14 capable of performing handoff independently for each of said plurality of groups.
Claim 18
Dependent Claim
19 words
A basestation according to claim 14 , wherein each of said groups of physical channels contains one physical channel.
Claim 19
Dependent Claim
23 words
A basestation according to claim 14 , wherein each of said groups of physical channels contains one or more channels of similar type.
Claim 20
Dependent Claim
51 words
A basestation according to claim 14 , wherein each physical channel represents a link between the mobile station and the basestation, and wherein a handoff for a given group of physical channels is performed upon receipt of a message indicating a change in the basestation for that group of physical channels.
Claim 21
Dependent Claim
37 words
A basestation according to claim 14 , wherein the groups comprise a first group that contains a fundamental channel, a second group that contains a supplemental channel, and a third group that contains a dedicated control channel.
Claim 22
Dependent Claim
45 words
A basestation according to claim 14 , wherein the groups comprise a first group that contains a fundamental channel and a dedicated control channel, a second group that contains a forward link supplemental channel, and a third group that contains a reverse link supplemental channel.
Claim 23
Dependent Claim
49 words
A basestation according to claim 14 , wherein the groups comprise a first group that contains a fundamental channel, a second group that contains a forward link supplemental channel, a third group that contains a reverse link supplemental channel, and a fourth group that contains a dedicated control channel.
Claim 24
Dependent Claim
109 words
Within a mobile communication system, a method of performing a handoff of a mobile station capable of having a plurality of groups of physical channels simultaneously, the method comprising: maintaining a respective identification identifying a set of basestations to be active for each particular group of physical channels; determining whether a handoff is required for any of the groups of channels, and making changes to The respective identification of any group requiring handoff; and independently performing a handoff for each group requiring handoff by handing off communications from the basestations previously identified by the respective identification of the set to the basestations identified after the changes have been made.
Claim 25
Dependent Claim
109 words
Within a mobile communication system, a method of performing a handoff of a mobile station capable of having a plurality of groups of physical channels simultaneously, the method comprising: maintaining a respective identification identifying a set of basestations to be active for each particular group of physical channels; determining whether a handoff is required for any of the groups of channels, and making changes to The respective identification of any group requiring handoff; and independently performing a handoff for each group requiring handoff by handing off communications from the basestations previously identified by the respective identification of the set to the basestations identified after the changes have been made.
Claim 26
Dependent Claim
19 words
A method according to claim 22 , further comprising performing handoff independently for each of said plurality of groups.
Claim 27
Dependent Claim
19 words
A method according to claim 23 , wherein each of said groups of physical channels contains one physical channel.
Claim 28
Dependent Claim
109 words
Within a mobile communication system, a method of performing a handoff of a mobile station capable of having a plurality of groups of physical channels simultaneously, the method comprising: defining a respective active set identifying a set of basestations to be active for each particular group of physical channels; determining whether a handoff is required for any of the groups of channels and if so making changes to the active sets of these groups; and independently performing a handoff for each group which has changed by handing off communications from the basestations previously identified by the respective active set to the basestations identified after the changes have been made.
Claim 29
Dependent Claim
109 words
Within a mobile communication system, a method of performing a handoff of a mobile station capable of having a plurality of groups of physical channels simultaneously, the method comprising: defining a respective active set identifying a set of basestations to be active for each particular group of physical channels; determining whether a handoff is required for any of the groups of channels and if so making changes to the active sets of these groups; and independently performing a handoff for each group which has changed by handing off communications from the basestations previously identified by the respective active set to the basestations identified after the changes have been made.
Claim 30
Dependent Claim
23 words
A method according to claim 25 , wherein each of said groups of physical channels contains one or more channels of similar type.
Claim 31
Dependent Claim
60 words
A method according to claim 25 , wherein each of the physical channels represents a link between the mobile station and one or more basestations, and wherein the basestations involved in links for a first particular group of physical channels are limited to be a subset of the basestations involved in links for a second particular group of physical channels.
Claim 32
Dependent Claim
31 words
A method according to claim 25 comprising: at least one basestation sending one or more messages to the mobile station identifying basestations to maintain channels for given groups of physical channels.
Claim 33
Dependent Claim
27 words
A method according to claim 25 , further comprising preventing the consecutive handoffs of a group of physical channels from occurring in less than a predetermined time.
Claim 34
Dependent Claim
40 words
A method according to claim 25 , wherein the step of independently performing a handoff comprises performing a first type of handoff which is independent of a second type of handoff of any other previous or subsequent handoff if any.
Claim 35
Dependent Claim
32 words
A method according to claim 30 , wherein each of the first and second type of handoff comprises any one of the group consisting of soft handoff, softer handoff, and hard handoff.
Claim 36
Dependent Claim
117 words
A mobile station capable of having a plurality of groups of physical channels simultaneously and of performing handoff independently for at least two of said groups of physical channels, said mobile station arranged to maintain a respective identification identifying a set of basestations to be active for each group of the at least two of said groups of physical channels, wherein changes are made to the identification of groups which have been determined to require handoff, and a handoff is performed for each group whose identification has been changed, by the handoff of communications from the basestations previously identified by the respective identification to the basestations identified by the respective identification after the changes have been made.
Claim 37
Dependent Claim
117 words
A mobile station capable of having a plurality of groups of physical channels simultaneously and of performing handoff independently for at least two of said groups of physical channels, said mobile station arranged to maintain a respective identification identifying a set of basestations to be active for each group of the at least two of said groups of physical channels, wherein changes are made to the identification of groups which have been determined to require handoff, and a handoff is performed for each group whose identification has been changed, by the handoff of communications from the basestations previously identified by the respective identification to the basestations identified by the respective identification after the changes have been made.
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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) | 2006-07-07 | 2007-01-06 | 2007-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-07-07 | 2011-01-06 | 2011-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-07-07 | 2015-01-06 | 2015-07-08 | $7700.00 | Window Closed / Lapsed |