# US 12,192,833 B2 · Mobility management method for low overhead state > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,833 B2 - Document ID: US12192833B2 - Status: Granted - Kind: B2 - Application number: 17/527,153 - Filed: 2021-11-15 - Published: 2022-03-10 - Granted: 2025-01-07 - Earliest claimed: 2015-12-31 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Bingzhao Li; Wei Quan; Jian Zhang; Weihua Liu - Web page: https://patentgrep.com/patent/US12192833B2 ## CPC - H04W 36/0033: {with transfer of context information} - H04W 48/10: using broadcasted information - H04W 52/0209: {in terminal devices} - H04W 76/20: Manipulation of established connections - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 36/0061: {of neighbour cell information} - H04W 76/19: Connection re-establishment - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Embodiments of the present invention disclose a mobility management method, user equipment, and a base station. The mobility management method may include: receiving, by the user equipment (UE) in a connected state, a source identifier of the UE from a first base station, where the source identifier is used to uniquely identify the UE in the first base station; entering, by the UE, a low-overhead state after satisfying a low-overhead activation condition; storing, by the UE in the low-overhead state, a connection context of the UE in the connected state, and camping on a cell according to a cell reselection criterion in a moving process. ## Claims ### Claim 1 A mobility management method applied for a terminal, comprising: receiving, when the terminal in a connected state in a first cell, a message, wherein the message indicates entry of a low overhead state and includes a source identifier from a first base station to which a first cell belongs, wherein the source identifier comprises a first part identifying the terminal in the first base station and a second part identifying the first base station; entering the low-overhead state, wherein the low-overhead state is state in which a connection context of the terminal is stored and the terminal camps on a cell according to a cell reselection criterion during movement; and determining that a current selected public land mobile network (PLMN) of the terminal does not belong to an equivalent PLMN of the terminal and, in response, exiting from the low-overhead state and entering an idle state. ### Claim 2 (depends on 1) The mobility management method according to claim 1, wherein the entering to the idle state comprises: deleting the connection context. ### Claim 3 (depends on 1) The mobility management method according to claim 1, further comprising: sending the source identifier to a second base station. ### Claim 4 (depends on 3) The mobility management method according to claim 3, wherein the sending the source identifier to the second base station comprises: in response to a preset condition being satisfied, sending the source identifier to the second base station. ### Claim 5 (depends on 4) The mobility management method according to claim 4, wherein the preset condition comprises: a second cell area on which the terminal currently camps does not belong to a specified cell set; or a second cell on which the terminal currently camps and the first cell do not belong to a same preset area or a same base station; or the terminal needs to send uplink data. ### Claim 6 An apparatus, comprising: at least one processor and a non-transitory memory, wherein the memory stores an execution instruction, and when the at least one processor executes the execution instruction to enable the apparatus to perform the steps of: receiving a message, wherein the message indicates entry of a low overhead state and includes a source identifier from a first base station to which a first cell belongs, wherein a terminal is in a connected state in the first cell, the source identifier comprises a first part identifying the terminal in the first base station and a second part identifying the first base station; entering the low-overhead state, wherein the low-overhead state is state in which a connection context of the terminal is stored and the terminal camps on a cell according to a cell reselection criterion during movement; and determining that a current selected public land mobile network (PLMN) of the terminal does not belong to an equivalent PLMN of the terminal and in response, exiting from the low-overhead state and entering an idle state. ### Claim 7 (depends on 6) The apparatus according to claim 6, wherein the entering to the idle state comprises: deleting the connection context. ### Claim 8 (depends on 6) The apparatus according to claim 6, wherein the apparatus is further configured to send the source identifier to a second base station. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the apparatus is configured to send the source identifier to the second base station in response to a preset condition being satisfied. ### Claim 10 (depends on 9) The apparatus according to claim 9, wherein the preset condition comprises: a second cell area on which the terminal currently camps does not belong to a specified cell set; or a second cell on which the terminal currently camps and the first cell do not belong to a same preset area or a same base station; or the terminal needs to send uplink data. ### Claim 11 A non-transitory computer-readable storage medium comprising instructions that, when executed, cause an apparatus to implement the following operations: receiving a message, wherein the message indicates entry of a low overhead state and includes a source identifier from a first base station to which a first cell belongs, wherein a terminal is in a connected state in the first cell, the source identifier comprises a first part identifying the terminal in the first base station and a second part identifying the first base station; entering the low-overhead state, wherein the low-overhead state is state in which a connection context of the terminal is stored and the terminal camps on a cell according to a cell reselection criterion during movement; and determining that a current selected public land mobile network (PLMN) of the terminal does not belong to an equivalent PLMN of the terminal and, in response, exiting from the low-overhead state and entering an idle state. ### Claim 12 (depends on 11) The non-transitory computer-readable storage medium according to claim 11, wherein the entering to the idle state comprises: deleting the connection context. ### Claim 13 (depends on 11) The non-transitory computer-readable storage medium according to claim 11, further comprising instructions cause the apparatus to receive control instruction indicating to enter the low-overhead state. ### Claim 14 (depends on 11) The non-transitory computer-readable storage medium according to claim 11, further comprising instructions cause the apparatus to send the source identifier to a second base station. ### Claim 15 (depends on 14) The non-transitory computer-readable storage medium according to claim 14, further comprising instructions cause the apparatus to send the source identifier to the second base station in response to a preset condition being satisfied. ### Claim 16 (depends on 15) The non-transitory computer-readable storage medium according to claim 15, wherein the preset condition comprises: a second cell area on which the terminal currently camps does not belong to a specified cell set; or a second cell on which the terminal currently camps and the first cell do not belong to a same preset area or a same base station; or the terminal needs to send uplink data.