Carrier selection method
First Claim
1. A method of carrier reselection for a mobile station (11) in an idle locked mode of a cellular communication system (1) using a spectrum block (51) having at least a first (62, 63) and a second (61) carrier duplex entity, said carrier duplex entity (61, 62, 63) being defined as a number of carriers which together provides for both uplink and downlink communication, said number being equal or larger than one, comprising the steps of:
- selecting a candidate carrier duplex entity for said mobile station (11); and
relocking.said mobile station (11) to a downlink carrier of said candidate carrier duplex entity if said downlink carrier is different from a downlink carrier, to which said mobile station (11) presently is locked, characterized by the step of;
obtaining a measure associated with a probability for said mobile station (11) to produce interference with adjacent external spectrum blocks (52) used by an external communication system (2), whereby a low value of said measure is connected to a high interference probability, said measure is obtained without any communication between said cellular communication system (1) and said external system (2) and based solely on measurement of a signal originating from said cellular communication system (1), said selecting step in turn comprises selecting said first carrier duplex entity (62, 63) as said candidate carrier duplex entity if said measure is lower than a first threshold value, said first carrier duplex entity (62, 63) having a larger frequency separation to said external spectrum blocks (52) than said second carrier duplex entity (61).
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention discloses a carrier selection method for reducing interferences between mobile stations and/or base stations. A measure associated with a probability for a mobile station, having access to at least two carrier duplex entities, to produce interferences with adjacent external spectrum blocks is obtained. A candidate carrier duplex entity is then selected based on the interference measure. If the measure is lower than a first threshold value an inner carrier duplex entity should be selected as candidate carrier duplex entity. A mobile station in idle mode then locks to a downlink carrier of the candidate carrier duplex entity upon locking into a system. Mobile stations in an idle locked mode relocks to the downlink carrier of the carrier duplex entity, whereas mobile stations in an active mode perform a carrier handover to the candidate carrier duplex entity, unless already locked thereto.
-
Citations
63 Claims
-
1. A method of carrier reselection for a mobile station (11) in an idle locked mode of a cellular communication system (1) using a spectrum block (51) having at least a first (62, 63) and a second (61) carrier duplex entity, said carrier duplex entity (61, 62, 63) being defined as a number of carriers which together provides for both uplink and downlink communication, said number being equal or larger than one, comprising the steps of:
-
selecting a candidate carrier duplex entity for said mobile station (11); and
relocking.said mobile station (11) to a downlink carrier of said candidate carrier duplex entity if said downlink carrier is different from a downlink carrier, to which said mobile station (11) presently is locked, characterized by the step of;
obtaining a measure associated with a probability for said mobile station (11) to produce interference with adjacent external spectrum blocks (52) used by an external communication system (2), whereby a low value of said measure is connected to a high interference probability, said measure is obtained without any communication between said cellular communication system (1) and said external system (2) and based solely on measurement of a signal originating from said cellular communication system (1), said selecting step in turn comprises selecting said first carrier duplex entity (62, 63) as said candidate carrier duplex entity if said measure is lower than a first threshold value, said first carrier duplex entity (62, 63) having a larger frequency separation to said external spectrum blocks (52) than said second carrier duplex entity (61). - View Dependent Claims (2, 4, 5, 6, 7, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
-
-
3. A method of carrier handover for a mobile station (11) in an active mode of a cellular communication system (1) using a spectrum block having at least a first (62, 63) and a second (61) carrier duplex entity, said carrier duplex entity (61, 62, 63) being defined as a number of carriers which together provides for both uplink and downlink communication, said number being equal or larger than one, comprising the steps of:
-
selecting a candidate carrier duplex entity for said mobile station (11); and
performing a carrier handover to said candidate carrier duplex entity if said candidate carrier duplex entity is different from a carrier duplex entity presently used by said mobile station (11), characterized by the step of;
obtaining a measure associated with a probability for said mobile station (11) to produce interference with adjacent external spectrum blocks (52) used by an external communication system (2), whereby a low value of said measure is connected to a high interference probability, said measure is obtained without any communication between said cellular communication system (1) and said external system (2) and based solely on measurement of a signal originating from said cellular communication system (1), said selecting step in turn comprises selecting said first carrier duplex entity (62, 63) as said candidate carrier duplex entity if said measure is lower than a first threshold value, said first carrier duplex entity (62, 63) having a larger frequency separation to said external spectrum blocks (52) than said second carrier duplex entity (61).
-
-
8. A method of carrier selection for a mobile station (11) in an idle mode of a cellular communication system (1) using a spectrum block (51) having at least a first (62, 63) and a second (61) carrier duplex entity, said carrier duplex entity (61, 62, 63) being defined as a number of carriers which together provides for both uplink and downlink communication, said number being equal or larger than one, comprising the steps of:
-
selecting a candidate carrier duplex entity for said mobile station (11); and
locking said mobile station (11) to a downlink carrier of said candidate carrier duplex entity upon locking into said communication system (1) from said idle mode to an idle locked mode, characterized by the step of;
obtaining a measure associated with a probability for said mobile station (11) to produce interference with adjacent external spectrum blocks (52) used by an external communication system (2), whereby a low value of said measure is connected to a high interference probability, said measure is obtained without any communication between said cellular communication system (1) and said external system (2) and based solely on measurement of a signal originating from said cellular communication system (1), said selecting step in turn comprises selecting said first carrier duplex entity (62) as said candidate carrier duplex entity if said measure is lower than a first threshold value, said first carrier duplex entity (62, 63) having a larger frequency separation to said external spectrum blocks (52) than said second carrier duplex entity (61). - View Dependent Claims (9, 10)
-
-
30. A cellular communication system (1), comprising:
-
a number of base stations (21) having means for communication with mobile stations (11) and using a spectrum block (51) having at least a first (62, 63) and a second (61) carrier duplex entity, said carrier duplex entity (61, 62, 63) being defined as a number of carriers which together provides for both uplink and downlink communication, said number being equal or larger than one;
selecting means for selecting a candidate carrier duplex entity; and
at least one of the means of the following list;
means for locking mobile stations (11) being in an idle mode to a downlink carrier of said candidate carrier duplex entity;
means for relocking mobile stations (11) being an idle locked mode to a candidate carrier said candidate carrier duplex entity if said downlink carrier is different from a downlink carrier, to which said mobile stations (11) presently is locked to; and
means for performing a carrier handover to said candidate carrier duplex entity if said candidate carrier duplex entity is different from a carrier duplex entity presently used by said mobile stations (11), characterized by;
means for obtaining a measure associated with a probability for said mobile stations (11) to produce interference with adjacent external spectrum blocks (52) used by an external communication system (2), whereby a low value of said measure is connected to a high interference probability, said measure is obtained without any communication between said cellular communication system (1) and said external system (2) and based solely on measurement of a signal originating from said cellular communication system (1), said selecting means being connected to said means for obtaining said measure and being arranged for selecting said first carrier duplex entity (62, 63) as said candidate carrier duplex entity if said measure is lower than a first threshold value, said first carrier duplex entity (62, 63) having a larger frequency separation to said external spectrum blocks (52) than said second carrier duplex entity (61). - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
-
-
50. A mobile station (11) in of a cellular communication system (1) using a spectrum block (51) having at least a first (62, 63) and a second (61) carrier duplex entity, said carrier duplex entity (61, 62, 63) being defined as a number of carriers which together provides for both uplink and downlink communication, comprising:
-
selecting means (206) for selecting a candidate carrier duplex entity for said mobile station (11); and
at least one of the means of the following list;
means (200) for locking said mobile station (11) to a downlink carrier of said candidate carrier duplex entity upon locking into said communication system (1) from an idle mode to an idle locked mode;
means (202) for relocking said mobile station (11) to a downlink carrier of said candidate carrier duplex entity if said downlink carrier is different from a downlink carrier, to which said mobile station (11) presently is locked to; and
means (204) for performing a carrier handover to said candidate carrier duplex entity if said candidate carrier duplex entity is different from a carrier duplex entity presently used by said mobile station (11), characterized by;
means (208) for obtaining a measure associated with a probability for said mobile station (11) to produce interference with adjacent external spectrum blocks (52) used by an external communication system (2), whereby a low value of said measure is connected to a high interference probability, said measure is obtained without any communication between said cellular communication system (1) and said external system (2) and based solely on measurement of a signal originating from said cellular communication system (1), said selecting means (206) being connected to said means (208) for obtaining said measure and being arranged for selecting said first carrier duplex entity (62, 63) as said candidate carrier duplex entity if said measure is lower than a first threshold value, said first carrier duplex entity (62, 63) having a larger frequency separation to said external spectrum blocks (52) than said second carrier duplex entity (61). - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
-
Specification