Patent EP0888026A2 successfully refreshed from Google Patents.
EP0888026A2
Expired / Lapsed
EP
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Method for handover and cell re-selection
Assignee: Nokia Oyj
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Filing: 1998-06-17
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Granted: —
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Expires: 2018-06-17
Abstract
Abstract For transmitting information about the neighbouring cells to mobile stations, a base station of a cellular radio system creates a message (27, 27') containing information about the neighbouring cells and transmits it to the mobile station. In addition to the transmission frequencies used in the neighbouring cells, the base station includes in the message other information characterizing the neighbouring cells (32a, 32b, 32c, 34). In particular, the base station includes in the message information about the quality of service offered to mobile stations by each of the neighbouring cells mentioned in the message. On the basis of the message, the mobile station makes a preliminary selection of a group of the most advantageous new cells and performs measurements among this preliminary selection in order to find a suitable new cell (41, 47). If the measurements show that there is at least one suitable new cell among the preliminary selection, the mobile station selects a new cell from this group (42). If the measurements show that there are no suitable new cells in this group, the mobile station selects a new cell from another group of cells than the preliminary selection (43, 48).
Inventors
- 👤 Mikko Korpela
- 👤 Sami Jutila
- 👤 Arto Pussinen
- 👤 Kari Pirttikangas
- 👤 Raino Lintulampi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:03
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0055; H04W36/0061; H04W84/00; H04W84/02; H04W84/04; H04W84/042
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A method for transmitting information about neighbouring cells from the base station of a cellular radio system to a mobile station, in which method the base station creates a message (27, 27') comprising information about the neighbouring cells and transmits it to the mobile station, and in addition to the transmission frequencies used in the neighbouring cells, the base station also includes other information (32a, 32b, 32c, 34) characterizing the neighbouring cells in said message.
Claim 2
Dependent Claim
30 words
A method according to Claim 1, wherein the base station includes information about the quality of service offered to the mobile stations by each neighbouring cell mentioned in the message.
Claim 3
Dependent Claim
38 words
A method according to Claim 2, wherein the quality of service of each cell is expressed by stating to which of the predetermined quality of service classes (32a) each of the neighbouring cells mentioned in the message belongs.
Claim 4
Independent Claim
76 words
A method according to any preceding Claim, wherein said message comprises - information of how many quality of service classes there are in the cell descriptions contained in the message (31), - information of the length of the part of the message (32b) that describes each quality of service class included in the message, and - information describing each quality of service class included in the message (32c) in the order of quality of service classes.
Claim 5
Dependent Claim
53 words
A method according to Claim 3 or Claim 4, wherein said message comprises - for each quality of service class information of how many cells belonging to the quality of service class concerned the message describes (33) and - information of neighbouring cells in standard length fields one cell at a time (34).
Claim 6
Independent Claim
171 words
A method for implementing the re-selection of a cell in a cellular radio system, which comprises base stations and cells related to them and mobile stations, comprising steps in which a) the base station transmits the mobile station a message, which includes information describing the neighbouring cells (40, 46) near the base station. b) on the basis of said message, the mobile station makes a preliminary selection of a group of the most advantageous new cells (41, 47) and c) the mobile station performs measurements among the preliminary selection of cells in order to find a suitable new cell (42), whereby - if the measurements show that there is at least one suitable, new cell among the preliminary selection of cells, the mobile station selects a new cell from this group (41, 47) and - if the measurements show that there are no suitable new cells among the preliminary selection of cells, the mobile station selects the new cell from among other than those included in the preliminary selection (43, 48).
Claim 7
Dependent Claim
67 words
A method according to Claim 6, wherein when a certain mobile station has an active telephone or data transfer connection with a certain base station, the base station in question transmits in step a) the mobile station a message, which describes only the neighbouring cells near the base station which offer a sufficient quality of service for handling the active telephone or data transfer connection in progress.
Claim 8
Dependent Claim
42 words
A method according to Claim 7, wherein in a situation in which the measurements show that there are no suitable new cells among the preliminary selection of cells, the mobile station asks said base station to transmit information about other neighbouring cells.
Claim 9
Dependent Claim
45 words
A method according to Claim 6, wherein when a certain mobile station has an active telephone or data transfer connection with a certain base station, the base station in question transmits in step a) the mobile station variable messages, which describe different neighbouring cells alternatively.
Claim 10
Dependent Claim
96 words
A base station of a cellular radio system (50), which comprises means (52) for creating messages and sending them to mobile stations, wherein - it comprises information (51) of a group of neighbouring cells near the cell of the base station in question, including information about the transmission frequency used in said neighbouring cells and of the service offered to the mobile stations by said neighbouring cells, and - it also comprises means for creating, on the basis of said information, a message describing the neighbouring cells and for transmitting said message to the mobile stations.
Claim 11
Dependent Claim
100 words
A mobile station of a cellular radio system, which is arranged to expect a certain service of a cell and which comprises means (53) for receiving messages from base stations and for performing cell-specific measurements in order to find a suitable cell for cell re-selection, wherein it comprises means for extracting information describing the cell-specific service from the messages transmitted by the base station of the selected cell, and for focusing the cell-specific measurements primarily on those of the neighbouring cells of the selected cell, which according to the information expressed correspond to the service expected by the mobile station.
Claim 12
Dependent Claim
150 words
A cellular radio system, which comprises base stations and cells related to them and mobile stations and in which - the base stations comprise means for creating messages and for transmitting them to the mobile stations, and - the mobile stations are arranged to expect a certain service from the cell, to receive messages from base stations and to perform cell-specific measurements in order to find a suitable cell for cell re-selection, wherein it comprises at least in one base station information of a group of neighbouring cells near the cell of the base station in question, containing information about the transmission frequency used in said neighbouring cells and about the service offered to the mobile stations by said neighbouring cells, whereby said base station comprises means for creating, on the basis of said information, a message describing the neighbouring cells and for transmitting said message to the mobile stations.
References Cited (Backward Citations)
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