# US 10,455,466 B2 · Handover method and device in ultra-dense network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,466 B2 - Document ID: US10455466B2 - Status: Granted - Kind: B2 - Application number: 15/759,903 - Filed: 2015-12-31 - Published: 2018-09-06 - Granted: 2019-10-22 - Earliest claimed: 2015-12-31 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Lili Zhang; Nathan Edward Tenny; Guorong Li - Web page: https://patentgrep.com/patent/US10455466B2 ## CPC - H04W 76/15: Setup of multiple wireless link connections - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 36/0011: {for data sessions of end-to-end connection} - H04W 36/0072: {of resource information of target access point} - H04W 56/001: {Synchronization between nodes} - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 36/08: Reselecting an access point - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Example handover methods and devices in an ultra-dense network are disclosed. One example method includes the following operations. A source base station sends a first message to a target base station, where the first message carries an arrival time indication of a terminal, and the arrival time indication is used to indicate a time at which or a time range in which the terminal is to access the target base station. The source base station receives a second message fed back by the target base station, where the second message carries a granted resource that is allocated for the arrival time indication of the terminal. The source base station adds the granted resource to a command message, and sends the command message to the terminal. ## Claims ### Claim 1 A handover method, comprising: receiving, by a terminal, a command message sent by a source base station, wherein the command message carries a granted resource that is allocated by a target base station to the terminal, wherein the command message further carries a maximum quantity of transmission times that is configured for the granted resource by the target base station, and wherein a value of the maximum quantity of transmission times is set to 1; sending, by the terminal, a radio resource control (RRC) connection reconfiguration complete message to the target base station on the granted resource, wherein the RRC connection reconfiguration complete message is used to indicate to the target base station that the terminal is successfully handed over to, dual-linked to, or multi-linked to the target base station; and after sending, by the terminal, the RRC connection reconfiguration complete message to the target base station on the granted resource, initiating, by the terminal, a random access process to the target base station when the configured maximum quantity of transmission times for the granted resource is reached and the terminal receives a negative feedback message indicating that signaling transmission on the granted resource fails. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: before the sending, by the terminal, an RRC connection reconfiguration complete message to the target base station on the granted resource: performing, by the terminal, a synchronization process with the target base station; and confirming, by the terminal, that synchronization with the target base station succeeds. ### Claim 3 (depends on 1) The method according to claim 1, further comprising: after the receiving, by a terminal, a command message sent by a source base station, initiating, by the terminal, a random access process to the target base station before occupying the granted resource. ### Claim 4 A handover device, comprising: a transceiver, the transceiver configured to: send a first message to a target base station, wherein the first message carries an arrival time indication of a terminal, and wherein the arrival time indication is used to indicate a time at which or a time range in which the terminal is to access the target base station; and receive a second message fed back by the target base station, wherein the second message carries a granted resource that is allocated for the arrival time indication of the terminal; and at least one processor, the at least one processor configured to: add the granted resource to a command message; and send the command message to the terminal by using the transceiver wherein the second message and the command message further carry a maximum quantity of transmission times that is configured for the granted resource by the target base station, and wherein a value of the maximum quantity of transmission times is set to 1. ### Claim 5 (depends on 4) The device according to claim 4, wherein the first message is a handover request message, and wherein the second message is a handover request acknowledgement message. ### Claim 6 (depends on 4) The device according to claim 4, wherein the first message is a secondary base station addition request message, and wherein the second message is a secondary base station addition request acknowledgement message. ### Claim 7 (depends on 6) The device according to claim 6, wherein at least one of: the secondary base station addition request message is a dual-link addition request message, and the secondary base station addition request acknowledgement message is a dual-link addition request acknowledgement message; and the secondary base station addition request message is a multi-link addition request message, and the secondary base station addition request acknowledgement message is a multi-link addition request acknowledgement message. ### Claim 8 (depends on 4) The device according to claim 4, wherein the arrival time indication is obtained by the at least one processor by performing handover decision, dual-link addition decision, or dual-link addition decision after the transceiver receives a measurement report sent by the terminal. ### Claim 9 (depends on 4) The device according to claim 4, wherein the arrival time indication is obtained by the at least one processor by a prediction based on a synchronization delay of the terminal in relation to the target base station and configuration information of the device and the target base station. ### Claim 10 (depends on 4) The device according to claim 4, wherein when adding the granted resource to the command message, the at least one processor is configured to: add the granted resource to an RRC connection reconfiguration message. ### Claim 11 (depends on 4) The device according to claim 4, the at least one processor is further configured to, before the transceiver sends the first message to the target base station: add a resource grant cancellation indication to the first message in response to determining that the terminal has at least two target base stations, wherein the resource grant cancellation indication is used to instruct the target base station not to allocate any granted resource for the arrival time indication. ### Claim 12 (depends on 4) The device according to claim 4, wherein the granted resource comprises an available uplink resource block. ### Claim 13 User equipment comprising at least one processor and a transceiver connected to the at least one processor, wherein the at least one processor is configured to process a message received or transmitted by the transceiver; and the transceiver is configured to: receive a command message sent by a source base station, wherein the command message carries a granted resource that is allocated by a target base station to the user equipment, wherein the command message further carries a maximum quantity of transmission times that is configured for the granted resource by the target base station, and wherein a value of the maximum quantity of transmission times is set to 1; send a radio resource control (RRC) connection reconfiguration complete message to the target base station on the granted resource, wherein the RRC connection reconfiguration complete message is used to indicate to the target base station that the user equipment is successfully handed over to, dual-linked to, or multi-linked to the target base station; and after sending the RRC connection reconfiguration complete message to the target base station on the granted resource, initiate a random access process to the target base station when the configured maximum quantity of transmission times for the granted resource is reached and the user equipment receives a negative feedback message indicating that signaling transmission on the granted resource fails. ### Claim 14 (depends on 13) The user equipment according to claim 13, wherein the at least one processor is further configured to: before the transceiver sends the RRC connection reconfiguration complete message to the target base station on the granted resource: perform a synchronization process with the target base station; and confirm that synchronization with the target base station succeeds. ### Claim 15 (depends on 14) The user equipment according to claim 14, wherein the at least one processor is further configured to: after the transceiver receives the command message carrying the granted resource and sent by the source base station, initiate a random access process to the target base station before the granted resource is occupied.