# US 2019/0320355 A1 · Wireless device, radio network node, and methods performed therein for handling communication in a wireless communication network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0320355 A1 - Document ID: US20190320355A1 - Status: Published application - Kind: A1 - Application number: 16/063,118 - Filed: 2018-03-22 - Published: 2019-10-17 - Earliest claimed: 2017-03-24 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Icaro Leonardo J. Da Silva - Web page: https://patentgrep.com/patent/US20190320355A1 ## CPC - H04W 36/0061: {of neighbour cell information} - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 41/0668: by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure - H04W 16/28: using beam steering - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 36/0085: {Hand-off measurements} - H04W 36/06: Reselecting a communication resource in the serving access point - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 76/19: Connection re-establishment - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0838: using contention-free random access [CFRA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Some embodiments herein relate to a method performed by a wireless device for handling communication of the wireless device in a wireless communication network, wherein the wireless device is served by a radio network node. The wireless device performs a beam tracking of one or more beams for a set of detected neighbour cells for tracking one or more best beams of respective neighbour cell based on measured signal strength or measured signal quality. The wireless device further receives an indication from the radio network node, wherein the indication indicates a target cell for the wireless device. When the target cell is in the set of detected neighbour cells, the wireless device further initiates a random access procedure associated with a best target beam for the target cell, wherein the best target beam is selected based on the beam tracking performed prior to receiving the indication. ## Claims ### Claim 1 A method performed by a wireless device for handling communication of the wireless device in a wireless communication network, wherein the wireless device is served by a radio network node, the method comprising: performing a beam tracking of one or more beams for a set of detected neighbour cells for tracking one or more best beams of respective neighbour cell based on measured signal strength or measured signal quality; receiving an indication from the radio network node, wherein the indication indicates a target cell for the wireless device; and when the target cell is in the set of detected neighbour cells, initiating a random access procedure associated with at least one target beam for the target cell, wherein the at least one target beam is selected based on the beam tracking performed prior to receiving the indication. ### Claim 2 (depends on 1) The method according to claim 1, wherein performing the beam tracking comprises performing measurements on reference signals of the one or more beams for the set of detected neighbour cells, and wherein the at least one target beam for the random access procedure is selected based on the signal strength or quality of respective beam. ### Claim 3 (depends on 1) The method according to claim 1, wherein the at least one target beam is selected further based on a list of allowed beams for the target cell for the wireless device. ### Claim 4 (depends on 1) The method according to claim 1, further comprising selecting and storing over a time interval the one or more beams for each neighbour cell based on the performed beam tracking. ### Claim 5 (depends on 4) The method according to claim 4, wherein the beam tracking comprises performing a full sweep of the one or more beams before selecting the one or more beams in each neighbour cell. ### Claim 6 (depends on 1) The method according to claim 1, wherein the random access procedure is associated with the at least one target beam by random access channel resources allocated for the at least one target beam. ### Claim 7 (depends on 1) The method according to claim 1, wherein the beam tracking comprises obtaining additional information, wherein the additional information is used to perform the random access procedure. ### Claim 8 (depends on 1) The method according to claim 1, wherein an occurrence of a mobility event triggers the wireless device to initiate the beam tracking. ### Claim 9 (depends on 1) The method according to claim 1, further comprising receiving configuration data from the radio network node, wherein the configuration data indicates that the wireless device is to perform beam tracking of one or more beams for a set of detected neighbour cells and upon reception of the indication, to initiate a random access procedure associated with at least one target beam for a target cell, wherein the at least one target beam is selected based on a performed beam tracking prior to receiving the indication, wherein the indication indicates the target cell for the wireless device. ### Claim 10 (depends on 1) The method according to claim 1, wherein measurements of the beam tracking is performed at a different time scale compared to measurements used for radio resource management, RRM, purposes, wherein the measurements are snapshots closer in time to one another than the measurements used for the RRM purposes. ### Claim 11 A method performed by a radio network node for handling communication of a wireless device in a wireless communication network, wherein the radio network node serves the wireless device, the method comprising: transmitting configuration data to the wireless device, wherein the configuration data indicates that the wireless device is to perform beam tracking of one or more best beams for a set of detected neighbour cells and upon reception of an indication, to initiate a random access procedure associated with at least one target beam for a target cell, wherein the at least one target beam is selected based on a performed beam tracking prior to receiving the indication, wherein the indication indicates a target cell for the wireless device. ### Claim 12 (depends on 11) The method according to the claim 11, wherein the configuration data comprises one or more filter parameters for measurements of the beam tracking and/or the configuration data defines the wireless device to monitor more beams of one candidate cell than for another candidate cell. ### Claim at position 13 13-26. (canceled) ### Claim 27 A wireless device for handling communication of the wireless device in a wireless communication network, wherein the wireless communication network comprises a radio network node being configured to serve the wireless device, and wherein the wireless device comprises processing circuitry and a memory, said memory comprising instructions executable by said processing circuitry whereby said wireless device is operative to: perform a beam tracking of one or more beams for a set of detected neighbour cells for tracking one or more best beams of respective neighbour cell based on measured signal strength or measured signal quality; receive an indication from the radio network node, wherein the indication indicates a target cell for the wireless device; and, when the target cell is in the set of detected neighbour cells, to initiate a random access procedure associated with at least one target beam for the target cell, and wherein the wireless device is operative to select the at least one target beam based on the beam tracking performed prior to receiving the indication. ### Claim 28 (depends on 27) The wireless device according to claim 27, wherein the wireless device is operative to perform the beam tracking by being operative to perform measurements on reference signals of the one or more beams for the set of detected neighbour cells, and wherein the wireless device is operative to select the at least one target beam for the random access procedure based on the signal strength or quality of respective beam. ### Claim 29 (depends on 27) The wireless device according to claim 27, wherein the wireless device is operative to select the at least one target beam further based on a list of allowed beams for the target cell for the wireless device. ### Claim 30 (depends on 27) The wireless device according to claim 27, further being operative to select and store over a time interval the one or more beams for each neighbour cell based on the performed beam tracking. ### Claim 31 (depends on 30) The wireless device according to claim 30, wherein the wireless device is operative to perform the beam tracking by being operative to perform a full sweep of beams before selecting the one or more beams in each neighbour cell. ### Claim 32 (depends on 27) The wireless device according to claim 27, wherein the random access procedure is associated with the at least one target beam by random access channel resources allocated for the at least one target beam. ### Claim 33 (depends on 27) The wireless device according to claim 27, wherein the wireless device is operative to obtain additional information during the beam tracking, wherein the additional information is used to perform the random access procedure. ### Claim 34 (depends on 27) The wireless device according to claim 27, wherein the wireless device is operative to initiate the beam tracking being triggered by an occurrence of a mobility event. ### Claim 35 (depends on 27) The wireless device according to claim 27, wherein the wireless device is operative to receive configuration data from the radio network node, wherein the configuration data indicates that the wireless device is to perform beam tracking of one or more beams for a set of detected neighbour cells and upon reception of the indication to initiate a random access procedure associated with at least one target beam for a target cell, wherein the at least one target beam is selected based on a performed beam tracking prior to receiving the indication, wherein the indication indicates the target cell for the wireless device. ### Claim 36 (depends on 27) The wireless device according to claim 27, wherein the wireless device is operative to perform measurements of the beam tracking at a different time scale compared to measurements used for radio resource management, RRM, purposes, wherein the measurements are snapshots closer in time to one another than the measurements used for the RRM purposes. ### Claim 37 A radio network node for handling communication of a wireless device in a wireless communication network, wherein the radio network node comprises processing circuitry and a memory, said memory comprising instructions executable by said processing circuitry whereby said radio network node is operative to serve the wireless device, and to: transmit configuration data to the wireless device, wherein the configuration data indicates that the wireless device is to perform beam tracking of one or more beams for a set of detected neighbour cells and to, upon reception of an indication, initiate a random access procedure associated with at least one target beam for a target cell, wherein the at least one target beam is selected based on a performed beam tracking prior to receiving the indication, and wherein the indication indicates the at least one target cell for the wireless device. ### Claim 38 (depends on 37) The radio network node according to the claim 37, wherein the configuration data comprises one or more filter parameters for measurements of the beam tracking and/or the configuration data defines the wireless device to monitor more beams of one candidate cell than for another candidate cell.