# US 2013/0094385 A1 · Methods and Arrangements for Handling Carrier Selection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0094385 A1 - Document ID: US20130094385A1 - Status: Published application - Kind: A1 - Application number: 13/703,669 - Filed: 2012-03-07 - Published: 2013-04-18 - Earliest claimed: 2011-03-08 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Fredrik Gunnarsson; Klas Johansson; Torbjörn Wigren - Web page: https://patentgrep.com/patent/US20130094385A1 ## CPC - H04W 72/542: using measured or perceived quality - H04W 74/002: {Transmission of channel access control information} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 28/04: Error control - H04W 72/02: Selection of wireless resources by user or terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method in at least one radio network node for handling earner selection comprises measuring at least one of interference or load levels on at least two uplink carriers, said measurement being performed in at least one sector of each carrier, calculating an offset based on said measured Interference or said measured load levels on the at least two uplink carriers, said offset reflecting the interference or load difference between the uplink carriers, and signalling said offset to a communication device, thereby allowing said communication device to base its carrier selection for random access at least on said measured interference or load levels on said at least two uplink carriers. ## Claims ### Claim at position 1 1-28. (canceled) ### Claim 29 A method in at least one radio network node for handling carrier selection, the method comprising: measuring at least one of interference or load levels on at least two uplink carriers, said measurement being performed in at least one sector of each carrier; calculating an offset based on said measured interference or load levels on the at least two uplink carriers, said offset reflecting the interference or load difference between said at least two uplink carriers; and signaling said offset to a communication device, thereby allowing said communication device to base its carrier selection for random access at least on said measured interference or load levels on said at least two uplink carriers. ### Claim 30 (depends on 29) The method of claim 29, wherein the step of measuring said interference or load levels on said at least two uplink carriers is performed continuously. ### Claim 31 (depends on 29) The method of claim 29, wherein the interference or load levels on the at least two uplink carriers are varying in time, wherein random access slots associated with time periods during which the interference or load levels on the at least two uplink carriers are low are announced, and wherein the step of measuring the interference or load levels on at least two uplink carriers are performed during said time periods. ### Claim 32 (depends on 29) The method of claim 29, wherein the step of measuring said interference or load levels on the at least two uplink carriers comprises providing filtered interference or load levels for said at least two uplink carriers. ### Claim 33 (depends on 29) The method of claim 29, wherein, if a receiver used in the step of measuring the interference or load levels on the at least two uplink carriers has interference suppressing (IS) capabilities, the step of measuring includes compensating for such interference suppression. ### Claim 34 (depends on 33) The method of claim 33, wherein said step of compensating comprises compensating said measured interference or load levels on said at least two uplink carriers or compensating said offset. ### Claim 35 (depends on 29) The method of claim 29, wherein, if a receiver used in the step of measuring the interference or load levels on the at least two uplink carriers has interference cancellation (IC) capabilities, the step of measuring comprises compensating for such interference cancellation. ### Claim 36 (depends on 35) The method of claim 35, wherein said step of compensating comprises compensating said measured interference or load levels on said at least two uplink carriers or compensating said offset. ### Claim 37 (depends on 29) The method of claim 29, wherein the step of signaling further comprises signaling to said communication device an identification of the receiver type used in the step of measuring. ### Claim 38 (depends on 29) The method of claim 29, wherein the step of signaling further comprises signaling to said communication device an identification of a mapping between said at least two uplink carriers and corresponding downlink carriers. ### Claim 39 (depends on 29) The method of claim 29, wherein the radio network node and the communication device have multi-carrier communication capabilities. ### Claim 40 (depends on 39) The method of claim 39, wherein the offset is signaled to the communication device via Layer 1 or Layer 2 signaling. ### Claim 41 (depends on 29) The method of claim 29, wherein the offset is signaled to the communication device relayed over at least one of a NBAP (Node B Application Part) or a RNSAP (Radio Network Subsystem Application Part). ### Claim 42 (depends on 29) The method of claim 29, wherein said at least two uplink carriers on which said interference or load levels are measured are selected as a subset of available uplink carriers when the communication device is in CELL_FACH state. ### Claim 43 (depends on 29) The method of claim 29, wherein said at least one radio network node comprises a base station. ### Claim 44 (depends on 29) The method of claim 29, wherein said at least one radio network node comprises a radio network controller. ### Claim 45 (depends on 29) The method of claim 29, wherein the measured interference levels are levels of received total wideband power, neighbor cell interference, own cell interference, or thermal noise. ### Claim 46 (depends on 29) The method of claim 29, wherein the measured load levels are noise rise or rise over Thermal (RoT) levels. ### Claim 47 A method in a communication device for handling carrier selection, the method comprising: receiving from a radio network node an offset calculated based on measured interference or load levels on at least two uplink carriers in at least one sector of each of the carriers, said offset reflecting at least one of the interference or load difference between said at least two uplink carriers; and performing carrier selection for random access based at least on said received offset. ### Claim 48 (depends on 47) The method of claim 47, further comprising receiving an identification of the receiver used in the measurement of the interference or load levels on the at least two uplink carriers, and performing the carrier selection further based on said identification of the receiver. ### Claim 49 (depends on 47) The method of claim 47, further comprising receiving an identification of the mapping between the at least two uplink carriers and corresponding downlink carriers, and performing the carrier selection further based on said identification of the mapping. ### Claim 50 A radio network arrangement configured for handling carrier selection and comprising: a receiver and an associated measurement processor configured to measure interference or load levels on at least two uplink carriers, said measurement being performed in at least one sector of each carrier; a calculation processor configured to calculate an offset based on the measured interference or load levels on the at least two uplink carriers, said offset reflecting the interference or load difference between said at least two uplink carriers; and a transmitter and an associated signaling processor configured to signal said offset to a communication device, thereby allowing said communication device to base its carrier selection for random access at least on the interference or load levels on said at least two uplink carriers. ### Claim 51 (depends on 50) The arrangement of claim 50, wherein the signaling processor is further configured to signal to the communication device an identification of the receiver type used in the step of measuring. ### Claim 52 (depends on 50) The arrangement of claim 50, wherein the signaling processor is further configured to signal to the communication device an identification of a mapping between said at least two uplink carriers and corresponding downlink carriers. ### Claim 53 A communication device configured to handle carrier selection and comprising: a receiver configured to receive from a radio network node an offset calculated based on measured interference or load levels on at least two uplink carriers in at least one sector of each of the carriers, said offset reflecting the interference or load difference between said at least two uplink carriers; and a selection processor configured to perform carrier selection for random access, based at least on the interference or load levels on the uplink carriers. ### Claim 54 (depends on 53) The device of claim 53, wherein the signaling processor is further configured to receive, via said receiver, an identification of the receiver type used in the measurement of the interference or load levels on the at least two uplink carriers and to perform carrier selection further based on said identification of the receiver type. ### Claim 55 (depends on 53) The device of claim 53, wherein the receiver is further configured to receiver, via said receiver, an identification of the mapping between the at least two uplink carriers and corresponding downlink carriers, and to perform carrier selection further based on said identification of the mapping.