# US 12,004,036 B2 · SCG-side service processing method and apparatus in dual connectivity scenario > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,036 B2 - Document ID: US12004036B2 - Status: Granted - Kind: B2 - Application number: 17/605,113 - Filed: 2020-04-24 - Published: 2022-06-23 - Granted: 2024-06-04 - Earliest claimed: 2019-04-30 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xiaoxian Li; Fenghui Dou - Web page: https://patentgrep.com/patent/US12004036B2 ## CPC - H04W 76/15: Setup of multiple wireless link connections - H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports} - H04W 36/0069: {in case of dual connectivity, e.g. decoupled uplink/downlink} - H04W 36/0085: {Hand-off measurements} - H04W 36/08: Reselecting an access point - H04W 36/304: {due to measured or perceived resources with higher communication quality} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 36/305: {Handover due to radio link failure (control signalling for hand-off failure H04W36/0079)} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A secondary cell group (SCG) side service processing method includes a master base station that configures a master cell group and an SCG for a terminal device. In uplink and downlink data transmission processes, when link quality information of a serving cell in the SCG meets a first preset condition, the terminal device obtains link quality information of a neighboring cell of the serving cell, determines, based on the link quality information, whether there is a better neighboring cell, and when there is no better neighboring cell, sends a first message to the master base station to enable the master base station to determine, based on the first message, whether to release the SCG. ## Claims ### Claim 1 A method comprising: establishing dual connections to a master base station and a secondary base station; obtaining first link quality information of a serving cell in a secondary cell group (SCG); obtaining second link quality information of a neighboring cell of the serving cell when the first link quality information meets a first preset condition; generating a first message when the second link quality information does not meet a second preset condition, wherein the first message carries third link quality information that is based on the first link quality information; sending the first message to the master base station to enable the master base station to process a service on the SCG based on the first message; generating a second message when the second link quality information meets the second preset condition, wherein the second message carries fourth link quality information that is based on the second link quality information; and sending the second message to the master base station. ### Claim 2 (depends on 1) The method of claim 1, wherein the first link quality information comprises one or more: a quantity of starting times of a timer T313 corresponding to a cell in the SCG; a running duration of a timer T313 corresponding to a cell in the SCG; a quantity of out-of-synchronization (out of sync) events in a cell in the SCG; a throughput of data transmitted in a cell in the SCG; a ratio of the throughput to a power consumption amount; a quantity of beam failures triggered in a cell in the SCG; an amount of data buffered at a radio link control (RLC) layer corresponding to a cell in the SCG; a latency of uplink data sent on a link in a cell in the SCG; a signal strength of a cell in the SCG; a signal strength change amplitude of a cell in the SCG; a retransmission rate of data transmitted on a link in a cell in the SCG; a signal-to-interference-plus-noise ratio (SINR) of a cell in the SCG; a modulation and coding scheme (MCS) index corresponding to a cell in the SCG; or a block error rate (BLER) in sending downlink data or receiving uplink data in a cell in the SCG. ### Claim 3 (depends on 1) The method of claim 1, wherein the second link quality information comprises at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a signal to interference plus noise ratio (SINR), a load, a priority, or availability. ### Claim 4 (depends on 1) The method of claim 1, wherein the second message comprises an A3 measurement report, an A4 measurement report, or an A5 measurement report. ### Claim 5 (depends on 1) The method of claim 1, wherein after sending the second message to the master base station, the method further comprises receiving a handover message instructing the terminal device to perform a handover from the serving cell to the neighboring cell. ### Claim 6 (depends on 1) The method of claim 1, wherein the first message comprises an A2 measurement report. ### Claim 7 (depends on 1) The method of claim 1, wherein after sending the first message to the master base station, the method further comprises: receiving, from the master base station, a release message instructing the terminal device to release the SCG; and releasing the SCG based on the release message. ### Claim 8 A terminal device comprising: a memory configured to store one or more computer programs; and one or more processors coupled to the memory and configured to execute the one or more computer programs to cause the terminal device to: establish dual connections to a master base station and a secondary base station; obtain first link quality information of a serving cell in a secondary cell group (SCG); obtain second link quality information of a neighboring cell of the serving cell when the first link quality information meets a first preset condition; generate a first message when the second link quality information does not meet a second preset condition, wherein the first message carries third link quality information that is based on the first link quality information; send the first message to the master base station to enable the master base station to process a service on the SCG based on the first message; generate a second message when the second link quality information meets the second preset condition, wherein the second message carries fourth link quality information that is based on the second link quality information; and send the second message to the master base station. ### Claim 9 (depends on 8) The terminal device of claim 8, wherein the first link quality information comprises one or more of: a quantity of starting times of a timer T313 corresponding to a cell in the SCG; a running duration of a timer T313 corresponding to a cell in the SCG; a quantity of out-of-synchronization (out of sync) events in a cell in the SCG; a throughput of data transmitted in a cell in the SCG; a ratio of a throughput of data transmitted in a cell in the SCG to a power consumption amount; a quantity of beam failures triggered in a cell in the SCG; an amount of data buffered at a radio link control (RLC) layer corresponding to a cell in the SCG; a latency of uplink data sent on a link in a cell in the SCG; a signal strength of a cell in the SCG; a signal strength change amplitude of a cell in the SCG; a retransmission rate of data transmitted on a link in a cell in the SCG; a signal to interference plus noise ratio (SINR) of a cell in the SCG; a modulation and coding scheme (MCS) index corresponding to a cell in the SCG; or a block error rate (BLER) in sending downlink data or receiving uplink data in a cell in the SCG. ### Claim 10 (depends on 8) The terminal device of claim 8, wherein the second link quality information comprises at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a signal to interference plus noise ratio (SINR), a load, a priority, or availability. ### Claim 11 (depends on 8) The terminal device of claim 8, wherein the second message comprises an A3 measurement report, an A4 measurement report, or an A5 measurement report. ### Claim 12 (depends on 8) The terminal device of claim 8, wherein after sending the second message to the master base station, the one or more processors is further configured to execute the one or more computer programs to cause the terminal device to receive, from the master base station, a handover message instructing the terminal device to perform a handover from the serving cell to the neighboring cell. ### Claim 13 (depends on 8) The terminal device of claim 8, wherein the first message comprises an A2 measurement report. ### Claim 14 (depends on 8) The terminal device of claim 8, wherein the one or more processors is further configured to execute the one or more computer programs to cause the terminal device to: receive a release message instructing the terminal device to release the SCG; and release the SCG based on the release message. ### Claim 15 A computer program product comprising computer-executable instructions stored on a non-transitory computer-readable medium and that, when executed by one or more processors, cause a terminal device to: establish dual connections to a master base station and a secondary base station; obtain first link quality information of a serving cell in a secondary cell group (SCG); obtain second link quality information of a neighboring cell of the serving cell when the first link quality information meets a first preset condition; generate a first message when the second link quality information does not meet a second preset condition, wherein the first message carries third link quality information that is based on the first link quality information; send the first message to the master base station to enable the master base station to process a service on the SCG based on the first message; generate a second message when the second link quality information meets the second preset condition, wherein the second message carries fourth link quality information that is based on the second link quality information; and send the second message to the master base station. ### Claim 16 (depends on 15) The computer program product of claim 15, wherein the first link quality information comprises one or more of: a quantity of starting times of a timer T313 corresponding to a cell in the SCG; a running duration of a timer T313 corresponding to a cell in the SCG; a quantity of out-of-synchronization (out of sync) events in a cell in the SCG; a throughput of data transmitted in a cell in the SCG; a ratio of a throughput of data transmitted in a cell in the SCG to a power consumption amount; a quantity of beam failures triggered in a cell in the SCG; an amount of data buffered at a radio link control (RLC) layer corresponding to a cell in the SCG; a latency of uplink data sent on a link in a cell in the SCG; a signal strength of a cell in the SCG; a signal strength change amplitude of a cell in the SCG; a retransmission rate of data transmitted on a link in a cell in the SCG; a signal to interference plus noise ratio (SINR) of a cell in the SCG; a modulation and coding scheme (MCS) index corresponding to a cell in the SCG; or a block error rate (BLER) in sending downlink data or receiving uplink data in a cell in the SCG. ### Claim 17 (depends on 15) The computer program product of claim 15, wherein the second link quality information comprises at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a signal to interference plus noise ratio (SINR), a load, a priority, or availability. ### Claim 18 (depends on 15) The computer program product of claim 15, wherein the second message comprises an A3 measurement report, an A4 measurement report, or an A5 measurement report. ### Claim 19 (depends on 15) The computer program product of claim 15, wherein after sending the second message to the master base station, the method further comprises receiving a handover message instructing the terminal device to perform a handover from the serving cell to the neighboring cell. ### Claim 20 (depends on 15) The computer program product of claim 15, wherein the first message comprises an A2 measurement report.