Patent US6035199A successfully refreshed from Google Patents.
US6035199A
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Method and apparatus for performing a handoff in a wireless communication system
Assignee: The AT&T MVPD Group LLC
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Filing: 1997-04-10
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Granted: 2000-03-07
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Expires: 2017-04-10
Abstract
Abstract The present invention relates to an apparatus and method for performing a handoff in wireless communication system. The method includes the steps of establishing communication between a mobile subscriber and a serving cell, determining whether a target cell and the serving cell are collocated, sending a normal burst handoff command to a mobile subscriber, sending a normal burst from the mobile subscriber to the target cell including a time offset, and establishing communication between the mobile subscriber and the target cell. The apparatus relates to a wireless system including a serving cell and a target cell in communication with a mobile subscriber. The mobile subscriber is sent a normal burst handoff, including an instruction to the mobile subscriber to transmit in normal bursts and to main current alignment, when the target cell overlaps the serving cell.
Inventors
- 👤 Charles A. Barnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:37
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0055; H04W36/0072; H04W56/00
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
82 words
A method of performing a handoff in a wireless communication system comprising the steps of: establishing communication in a serving cell; determining whether a target cell and the serving cell are collocated and unsynchronized; estimating an initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time; sending a normal burst handoff command including the estimated initial timing offset; sending normal bursts to the target cell; and establishing communication in the target cell.
Claim 2
Independent Claim
82 words
A method of performing a handoff in a wireless communication system comprising the steps of: establishing communication in a serving cell; determining whether a target cell and the serving cell are collocated and unsynchronized; estimating an initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time; sending a normal burst handoff command including the estimated initial timing offset; sending normal bursts to the target cell; and establishing communication in the target cell.
Claim 3
Independent Claim
16 words
The method of claim I wherein the handoff command comprises an instruction to transmit normal bursts.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the time offset comprises current time alignment.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein the step of determining collocation comprises determining whether the target cell and serving cell are at a same site.
Claim 6
Independent Claim
108 words
A method of performing a handoff in a wireless communication system comprising the steps of: establishing communication in a serving cell; determining whether a target cell and the serving cell are collocated; sending a normal burst handoff command including timing offset; sending normal bursts to the target cell; and establishing communication in the target cell; wherein the steps of determining collocation comprises: assigning the target cell to a site in a database; assigning the serving cell to a site in a database; retrieving the site of the target cell; retrieving the site of the serving cell; and comparing the site of the serving cell and the target cell.
Claim 7
Independent Claim
108 words
A method of performing a handoff in a wireless communication system comprising the steps of: establishing communication in a serving cell; determining whether a target cell and the serving cell are collocated; sending a normal burst handoff command including timing offset; sending normal bursts to the target cell; and establishing communication in the target cell; wherein the steps of determining collocation comprises: assigning the target cell to a site in a database; assigning the serving cell to a site in a database; retrieving the site of the target cell; retrieving the site of the serving cell; and comparing the site of the serving cell and the target cell.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein the serving cell and the target cell comprise medium size cells.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein the target cell and serving cell comprise large cells.
Claim 10
Dependent Claim
15 words
The method of claim 1 further comprising setting up a channel in the target cell.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein the normal burst includes a current time alignment.
Claim 12
Dependent Claim
21 words
The method of claim 1 further comprising transferring the communication to establish communication between the mobile subscriber and the target cell.
Claim 13
Dependent Claim
16 words
The method of claim 5 wherein the handoff command comprises an instruction to transmit normal bursts.
Claim 14
Dependent Claim
13 words
The method of claim 5 wherein the time offset comprises current time alignment.
Claim 15
Dependent Claim
25 words
The method of claim 5 wherein the step of determining collocation comprises determining whether the target cell and serving cell are at a same site.
Claim 16
Dependent Claim
17 words
The method of claim 5 wherein the serving cell and the target cell comprise medium size cells.
Claim 17
Dependent Claim
15 words
The method of claim 5 wherein the target cell and serving cell comprise large cells.
Claim 18
Dependent Claim
15 words
The method of claim 5 further comprising setting up a channel in the target cell.
Claim 19
Dependent Claim
14 words
The method of claim 5 wherein the normal burst includes a current time alignment.
Claim 20
Dependent Claim
21 words
The method of claim 5 further comprising transferring the communication to establish communication between the mobile subscriber and the target cell.
Claim 21
Independent Claim
84 words
A method of performing a handoff in a mobile communication system comprising the steps of: establishing a communication channel in a serving cell; determining the radius of a target cell; estimating an initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time; sending a normal burst handoff including the estimated initial timing offset; sending a normal burst to the target cell including a time offset; and establishing a communication channel in the target cell.
Claim 22
Independent Claim
84 words
A method of performing a handoff in a mobile communication system comprising the steps of: establishing a communication channel in a serving cell; determining the radius of a target cell; estimating an initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time; sending a normal burst handoff including the estimated initial timing offset; sending a normal burst to the target cell including a time offset; and establishing a communication channel in the target cell.
Claim 23
Dependent Claim
16 words
The method of claim 19 wherein the timing offset comprises half of an interslot guard time.
Claim 24
Dependent Claim
23 words
The method of claim 19 further comprising the step of determining whether the target cell radius is less than an inter-slot guard time.
Claim 25
Dependent Claim
30 words
The method of claim 19 further comprising sending a normal burst from the mobile subscriber when the target radius corresponds to less than four symbols of an inter-slot guard time.
Claim 26
Dependent Claim
41 words
The method of claim 19 wherein the normal burst handoff to a mobile subscriber is sent when a radius of a target cell is less than an inter-slot guard time and the target cell and the serving cell are not collocated.
Claim 27
Dependent Claim
18 words
The method of claim 19 further comprising the step of setting up a channel in the target cell.
Claim 28
Dependent Claim
25 words
The method of claim 19 further comprising the step of transmitting normal bursts including a time alignment of half the radius of the target cell.
Claim 29
Dependent Claim
24 words
The method of claim 19 further comprising the step of transferring the communication to establish communication between the mobile subscriber and the target cell.
Claim 30
Dependent Claim
30 words
The method of claim 5 further comprising sending a normal burst from the mobile subscriber when the target radius corresponds to less than four symbols of an inter-slot guard time.
Claim 31
Dependent Claim
74 words
A wireless communication network comprising: a serving cell communicating with a mobile subscriber; a target cell communicating with the mobile subscriber; and a normal burst handoff sent to the mobile subscriber when the target cell overlaps the serving cell, the normal burst handoff including an instruction to transmit in normal burst and an estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 32
Dependent Claim
74 words
A wireless communication network comprising: a serving cell communicating with a mobile subscriber; a target cell communicating with the mobile subscriber; and a normal burst handoff sent to the mobile subscriber when the target cell overlaps the serving cell, the normal burst handoff including an instruction to transmit in normal burst and an estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 33
Dependent Claim
17 words
The wireless communication network of claim 28 wherein the serving cell is between 12 to 80 km.
Claim 34
Dependent Claim
17 words
The wireless communication network of claim 28 wherein the target cell is between 12 to 80 km.
Claim 35
Dependent Claim
70 words
A wireless communication network comprising: a serving cell communicating with a mobile subscriber; a target cell communicating with the mobile subscriber; and a normal burst handoff including an instruction to transmit in normal bursts and with time alignment offset corresponding to half the radius of the target cell, the normal burst handoff sent to the mobile subscriber when the radius of the target is less than an inter-slot guard time.
Claim 36
Dependent Claim
70 words
A wireless communication network comprising: a serving cell communicating with a mobile subscriber; a target cell communicating with the mobile subscriber; and a normal burst handoff including an instruction to transmit in normal bursts and with time alignment offset corresponding to half the radius of the target cell, the normal burst handoff sent to the mobile subscriber when the radius of the target is less than an inter-slot guard time.
Claim 37
Dependent Claim
17 words
The wireless communication network of claim 31 wherein the serving cell is between 12 to 80 km.
Claim 38
Dependent Claim
17 words
The wireless communication network of claim 31 wherein the target cell is between 12 to 80 km.
Claim 39
Independent Claim
89 words
A method in a communication system comprising: transmitting a handoff command including an estimated initial timing offset to a mobile subscriber when it is determined that a handoff should be performed between a serving cell and a target cell which are not collocated, the handoff command instructing the mobile subscriber to initiate a normal burst to the target cell in accordance with the estimated initial timing offset, the estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 40
Independent Claim
89 words
A method in a communication system comprising: transmitting a handoff command including an estimated initial timing offset to a mobile subscriber when it is determined that a handoff should be performed between a serving cell and a target cell which are not collocated, the handoff command instructing the mobile subscriber to initiate a normal burst to the target cell in accordance with the estimated initial timing offset, the estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 41
Dependent Claim
20 words
The method according to claim 34, wherein the estimated initial timing offset corresponds to half of the inter-slot guard time.
Claim 42
Dependent Claim
22 words
The method according to claim 34, wherein the estimated initial timing offset corresponds to half of a radius of the target cell.
Claim 43
Independent Claim
87 words
A method in a communication system comprising the steps of: receiving a handoff command including an estimated initial timing offset when it is determined that a handoff should be performed between a serving cell and a target cell which are not collocated; and initiating a normal burst to the target cell in accordance with the estimated initial timing offset in response to the handoff command, the estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 44
Independent Claim
87 words
A method in a communication system comprising the steps of: receiving a handoff command including an estimated initial timing offset when it is determined that a handoff should be performed between a serving cell and a target cell which are not collocated; and initiating a normal burst to the target cell in accordance with the estimated initial timing offset in response to the handoff command, the estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 45
Dependent Claim
20 words
The method according to claim 37, wherein the estimated initial timing offset corresponds to half of the inter-slot guard time.
Claim 46
Dependent Claim
22 words
The method according to claim 37, wherein the estimated initial timing offset corresponds to half of a radius of the target cell.
Claim 47
Dependent Claim
90 words
A communication network comprising: a transmitting device for transmitting a handoff command including an estimated initial timing offset to a mobile subscriber when it is determined that a handoff should be performed between a serving cell and a target cell which are not collocated, the handoff command instructing the mobile subscriber to initiate a normal burst to the target cell in accordance with the estimated initial timing offset, the estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 48
Dependent Claim
90 words
A communication network comprising: a transmitting device for transmitting a handoff command including an estimated initial timing offset to a mobile subscriber when it is determined that a handoff should be performed between a serving cell and a target cell which are not collocated, the handoff command instructing the mobile subscriber to initiate a normal burst to the target cell in accordance with the estimated initial timing offset, the estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 49
Dependent Claim
21 words
The communication network according to claim 40, wherein the estimated initial timing offset corresponds to half of the inter-slot guard time.
Claim 50
Dependent Claim
23 words
The communication network according to claim 40, wherein the estimated initial timing offset corresponds to half of a radius of the target cell.
Claim 51
Dependent Claim
87 words
A communication network comprising: receiving means for receiving a handoff command including an estimated initial timing offset when it is determined that a handoff should be performed between a serving cell and a target cell which are not collocated; and transmitting means for initiating a normal burst to the target cell in accordance with the estimated initial timing offset in response to the handoff command, the estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 52
Dependent Claim
87 words
A communication network comprising: receiving means for receiving a handoff command including an estimated initial timing offset when it is determined that a handoff should be performed between a serving cell and a target cell which are not collocated; and transmitting means for initiating a normal burst to the target cell in accordance with the estimated initial timing offset in response to the handoff command, the estimated initial timing offset corresponding to a time which is less than or equal to half of an inter-slot guard time.
Claim 53
Dependent Claim
20 words
The method according to claim 43, wherein the estimated initial timing offset corresponds to half of the inter-slot guard time.
Claim 54
Dependent Claim
22 words
The method according to claim 43, wherein the estimated initial timing offset corresponds to half of a radius of the target cell.
References Cited (Backward Citations)
US5175867A
Cited
US5355515A
Cited
US5640679A
Cited
US5711003A
Cited
US5802473A
Cited
US5542098A
Cited
US5640676A
Cited
US5802046A
Cited
US5818829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-07 | 2003-09-06 | 2004-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-07 | 2007-09-06 | 2008-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-07 | 2011-09-06 | 2012-03-07 | $7700.00 | Window Closed / Lapsed |