EP0369535A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cellular radio system
Assignee: Philips Electronics UK Ltd
•
Filing: 1989-11-10
•
Granted: —
•
Expires: 2009-11-10
Abstract
Abstract A cellular radio system in which a base station (BS1) establishing two way communication with a mobile (10) requests base stations (BS2 to BS7) of a subset of adjacent cells to reserve a channel so that in the event of handover to a base station in one of these cells this can be executed quicker than if the reservation had not been made. In making the request for reservation, the communicating base station (BS1) passes on details of the call-in-progress. Once call has been handed over a new subset of adjacent cells is created.
Inventors
- 👤 Alister John Bailey
- 👤 Sunil Keshavji Vadgama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 11:13
CPC Classifications
H; H04; H04W; H04W28/00; H04W28/16; H04W28/26; H04W36/00; H04W36/0005; H04W36/0055; H04W36/0079; H04W36/0058; H04W36/0064; H04W92/00; H04W92/16; H04W92/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
168 words
A cellular radio system characterised by a plurality of geographically separate base stations distributed so as to define a plurality of contiguous radio cells, means for enabling the base stations to communicate with each other, at least one network controller for controlling a group of the base stations, each base station having means permitting two-way communication with a mobile present in its cell on a selected one of a plurality of radio channels, means responsive to the establishment of two-way communication between a mobile and a base station on the selected channel, for requesting the base stations of a subset of cells, adjacent to the cell in which the mobile is presently in, to reserve a channel from the plurality of channels available to each of the base stations, and means responsive to the signal quality parameters of the communications between the base station and the mobile becoming unacceptable for handing over the mobile to a previously reserved channel in one of the subset of the adjacent cells.
Claim 2
Dependent Claim
168 words
A cellular radio system characterised by a plurality of geographically separate base stations distributed so as to define a plurality of contiguous radio cells, means for enabling the base stations to communicate with each other, at least one network controller for controlling a group of the base stations, each base station having means permitting two-way communication with a mobile present in its cell on a selected one of a plurality of radio channels, means responsive to the establishment of two-way communication between a mobile and a base station on the selected channel, for requesting the base stations of a subset of cells, adjacent to the cell in which the mobile is presently in, to reserve a channel from the plurality of channels available to each of the base stations, and means responsive to the signal quality parameters of the communications between the base station and the mobile becoming unacceptable for handing over the mobile to a previously reserved channel in one of the subset of the adjacent cells.
Claim 3
Dependent Claim
41 words
A system as claimed in Claim 1, characterised in that the base station handing over the mobile comprises means for informing the base stations of the cells comprising its subset of adjacent cells that it is relinquishing communication with the mobile.
Claim 4
Dependent Claim
42 words
A system as claimed in Claim 1 or 2, characterised in that a base station has means, responsive to taking-over a call, for informing the base stations in its neighbouring cells of this fact and to request them to reserve a channel.
Claim 5
Dependent Claim
52 words
A system as claimed in Claim 1, 2 or 3, characterised in that the network controller or base station comprises means for building-up a call history of a mobile and, in response to determining that a mobile is moving along a predictable route, for forming subsets of cells aligned with said route.
Claim 6
Independent Claim
62 words
A system as claimed in any one of Claims 1 to 4, characterised in that the network controller or base station has means for requesting at least one base station of the subset of the adjacent cells to take-over the communication with the mobile in the event of failing of the base station in the cell in which the mobile is present.
Claim 7
Independent Claim
52 words
A system as claimed in any one of Claims 1 to 5, characterised in that the base stations of said subset of the adjacent cells have means for monitoring the signal quality parameters of the communication between the base station of the cell in which the mobile is present and the mobile.
Claim 8
Independent Claim
61 words
A system as claimed in any one of Claims 1 to 6, characterised in that a network controller includes means for collating a statistical data base of handover traffic to and from respective cells which are controlled by the network controller and for taking the statistical data base into account when making a decision to comply with a cell reservation request.
Claim 9
Dependent Claim
27 words
A system as claimed in Claim 7, characterised in that the network controller further comprises means for estimating the period of time before a handover is required.
Claim 10
Independent Claim
65 words
A system as claimed in any one of Claims 1 to 6, characterised in that each base station includes means for collating a statistical data base of handover traffic to and from itself, said means being operative, in response to being requested to reserve a channel, to take its statistical data base into account when making a decision to comply with a cell reservation request.
Claim 11
Dependent Claim
27 words
A system as claimed in Claim 9, characterised in that each base station further comprises means for estimating the period of time before a handover is required.
Claim 12
Independent Claim
130 words
A method of operating a cellular radio system comprising a plurality of geographically separate base stations distributed so as to define a plurality of continuous radio cells, means for enabling the base stations to communicate with each other and at least one network controller for controlling a group of the base stations, characterised in that when a mobile in one of said cells establishes two way communication with the base station of said one cell, said base station forms a subset of cells adjacent to its own cell by requesting the base stations of said subset of cells to reserve a channel in anticipation of handing over the communication with the mobile to one of the base stations of the subset in response to the signal quality parameters becoming unacceptable.
Claim 13
Independent Claim
130 words
A method of operating a cellular radio system comprising a plurality of geographically separate base stations distributed so as to define a plurality of continuous radio cells, means for enabling the base stations to communicate with each other and at least one network controller for controlling a group of the base stations, characterised in that when a mobile in one of said cells establishes two way communication with the base station of said one cell, said base station forms a subset of cells adjacent to its own cell by requesting the base stations of said subset of cells to reserve a channel in anticipation of handing over the communication with the mobile to one of the base stations of the subset in response to the signal quality parameters becoming unacceptable.
Claim 14
Dependent Claim
29 words
A method as claimed in Claim 11, characterised in that on handover, the base station taking over the communication with the mobile forms its own subset of adjacent cells.
Claim 15
Dependent Claim
42 words
A method as claimed in Claim 11 or 12, characterised in that the base station with which the mobile was previously communicating transmits at least to the base stations of its subset a message informing them that it is relinquishing the call.
Claim 16
Dependent Claim
52 words
A method as claimed in Claimed in Claim 11, 12 or 13, characterised in that the network controller or base station builds up a call history of a mobile and, on determining that a mobile is moving along a predictable route, instructs the formation of subsets of cells aligned with said route.
Claim 17
Independent Claim
56 words
A method as claimed in any one of Claims 11 to 14, characterised in that in the event of failing of the base station in the cell in which the mobile is present, the network controller requests at least one base station of the subset of the adjacent cells to take-over the communication with the mobile.
Claim 18
Independent Claim
49 words
A method as claimed in any one of Claims 11 to 15, characterised in that the base stations of the subset of the adjacent cells monitor the signal quality parameters of the communications between the base station of the cell in which the mobile is present and the mobile.
Claim 19
Independent Claim
61 words
A method as claimed in any one of Claims 11 to 16, characterised in that a network controller collates a statistical data base of handover traffic to and from the respective cells which are controlled by the network controller and in that it takes the statistical data base into account when making a decision to comply with a cell reservation request.
Claim 20
Dependent Claim
23 words
A method as claimed in Claim 17, characterised in that the network controller estimates the period of time before a handover is required.
Claim 21
Independent Claim
58 words
A method as claimed in any one of Claims 11 to 16, characterised in that each base station collates a statistical data base of handover traffic to and from itself and in response to being requested to reserve a channel, takes its statistical data base into account when making a decision to comply with a cell reservation request.
Claim 22
Dependent Claim
23 words
A system as claimed in Claim 19, characterised in that each base station estimates the period of time before a handover is required.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.