# US 10,484,915 B2 · Identifying a beam for accessing a target cell of a wireless handover > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,915 B2 - Document ID: US10484915B2 - Status: Granted - Kind: B2 - Application number: 16/211,399 - Filed: 2018-12-06 - Published: 2019-04-11 - Granted: 2019-11-19 - Earliest claimed: 2016-11-04 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Janne Peisa; Icaro L. J. Da Silva - Web page: https://patentgrep.com/patent/US10484915B2 ## CPC - H04W 36/0072: {of resource information of target access point} - H04W 36/0077: {of access information of target access point} - H04W 36/085: {involving beams of access points} - H04W 74/0838: using contention-free random access [CFRA] - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract In accordance with particular embodiments, there is disclosed herein a method performed by a wireless device for handover. The method comprises receiving a first handover message from a source network node associated with a source cell. The first handover message comprises an identification of a target cell and access information associated with the target cell. The target cell is different than the source cell and comprises one or more beams. The method also includes identifying at least one beam from among the one or more beams of the target cell. The at least one beam is identified based on the identification of the target cell and the access information from the first handover message. The method further includes accessing the target cell using the identified at least one beam. ## Claims ### Claim 1 A method performed by a wireless device for handover, the method comprising: receiving an RRC connection reconfiguration message from a source network node associated with a source cell, the RRC connection reconfiguration message comprising an identification of a target cell and access information associated with the target cell, wherein the target cell is different than the source cell and comprises one or more beams to be transmitted by the target cell and the access information comprises beam related information that comprises common random access configuration information associated with the one or more beams and dedicated random access configuration information associated with the one or more beams; identifying at least one beam transmitted from the target cell from among the one or more beams of the target cell based on the identification of the target cell and the access information from the RRC connection reconfiguration message; and accessing the target cell using the identified at least one beam. ### Claim 2 (depends on 1) The method of claim 1, wherein the target cell is associated with a second network node, the second network node being different than the source network node. ### Claim 3 (depends on 1) The method of claim 1, wherein the access information comprises Random Access Channel (RACH) information. ### Claim 4 (depends on 1) The method of claim 1, wherein the target cell has at least two beams and the access information comprises an indication of allowed beams associated with the target cell, the allowed beams comprising fewer than all of the beams of the target cell. ### Claim 5 (depends on 4) The method of claim 4, wherein the access information includes a random access preamble mapped to each of the allowed beams of the target cell. ### Claim 6 (depends on 1) The method of claim 1, wherein accessing the target cell using the identified at least one beam comprises accessing the target cell using a contention based random access procedure. ### Claim 7 (depends on 1) The method of claim 1, wherein accessing the target cell using the identified at least one beam comprises accessing the target cell without first reading system information associated with the target cell. ### Claim 8 A wireless device for handover comprising: a wireless interface configured to receive an RRC connection reconfiguration message from a source network node associated with a source cell, the RRC connection reconfiguration message comprising an identification of a target cell and access information associated with the target cell, wherein the target cell is different than the source cell and comprises one or more beams to be transmitted by the target cell and the access information comprises beam related information that comprises common random access configuration information associated with the one or more beams and dedicated random access configuration information associated with the one or more beams; processing circuitry configured to identify at least one beam transmitted from the target cell from among the one or more beams of the target cell based on the identification of the target cell and the access information from the RRC connection reconfiguration message; and an input and output interface configured to receive input information and provide output information; a power source configured to provide power to the wireless interface, processing circuity and input and output interface; and wherein the wireless interface is further configured to access the target cell using the identified at least one beam. ### Claim 9 (depends on 8) The wireless device of claim 8, wherein the target cell is associated with a second network node, the second network node being different than the source network node. ### Claim 10 (depends on 8) The wireless device of claim 8, wherein the access information comprises Random Access Channel (RACH) information. ### Claim 11 (depends on 8) The wireless device of claim 8, wherein the target cell has at least two beams and the access information comprises an indication of allowed beams associated with the target cell, the allowed beams comprising fewer than all of the beams of the target cell. ### Claim 12 (depends on 11) The wireless device of claim 11, wherein the access information includes a random access preamble mapped to each of the allowed beams of the target cell. ### Claim 13 (depends on 8) The wireless device of claim 8, wherein the wireless interface configured to access the target cell using the identified at least one beam is configured to access the target cell using a contention based random access procedure. ### Claim 14 (depends on 8) The wireless device of claim 8, wherein the wireless interface configured to access the target cell using the identified at least one beam is configured to access the target cell without first reading system information associated with the target cell. ### Claim 15 A wireless communication system for handover, the system comprising: at least two network nodes; at least one wireless device wirelessly connected to a first of the at least two network nodes; wherein the first network node is configured to: determine access information associated with a second of the at least two network nodes for the at least one wireless device; and prepare the access information associated with the second network node to be transmitted to the at least one wireless device; and wherein the at least one wireless device is configured to: receive an RRC connection reconfiguration message from the first network node, the handover message comprising an identification associated with the second network node and the access information associated with the second network node and comprises beam related information that comprises common random access configuration information associated with the one or more beams and dedicated random access configuration information associated with the one or more beams; identify and select at least one beam from the second network node; and access the second network node using the identified and selected at least one beam based on the access information from the handover message.