A connection switching management system and method

Abstract

An embodiment of the present application discloses a multi-connection switching management system and method, wherein the system includes: a terminal, a main base station, a secondary base station, and an adjacent base station. The main base station can uniformly control the conditional switching of the terminal on the two connections of the main base station and the secondary base station, thereby ensuring the optimal base station selection on the two connections, which is beneficial to improving the throughput of the terminal.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a connection switching management system and method. Background Art

[0002] The fifth generation mobile communication technology (5G) is a new generation of broadband mobile communication technology with the characteristics of high speed, low latency and large connection. 5G communication facilities are the network infrastructure for realizing the interconnection of man, machine and things. The International Telecommunication Union (ITU) has defined three major application scenarios of 5G, namely enhanced mobile broadband (eMBB), ultra-high reliability and low latency communication (uRLLC) and massive machine type communication (mMTC). Enhanced mobile broadband (eMBB) is mainly aimed at the explosive growth of mobile Internet traffic, providing mobile Internet users with a more extreme application experience; ultra-high reliability and low latency communication (uRLLC) is mainly aimed at vertical industry application needs with extremely high requirements for latency and reliability, such as industrial control, telemedicine, and autonomous driving; massive machine type communication (mMTC) is mainly aimed at smart cities, smart homes, environmental monitoring and other applications with sensing and data collection as the goal. In order to meet the diverse application scenario requirements of 5G, the key performance indicators of 5G are more diversified. ITU has defined the key performance indicators of 5G, among which high speed, low latency and large connection have become the most prominent features of 5G.

[0003] At present, the conditional handover (CHO) mechanism is introduced in the 5G communication system. When one or more handover conditions are met, the UE (user equipment) performs handover by itself. Therefore, after receiving the signaling containing the CHO configuration, the UE starts to evaluate the handover execution conditions through measurement, and once the handover execution is completed, the evaluation of the execution conditions is stopped. The dual connection (DC) mechanism is also introduced in the 5G communication system. The terminal device can maintain connection with two base stations at the same time, one of which is called the primary base station and the other is called the secondary base station. However, the current 5G system does not support conditional handover and dual connection collaborative configuration, that is, when the terminal is configured with these two features, the terminal actually performs conditional handover separately at each base station, that is, the primary base station controls the terminal to perform conditional handover of the primary base station alone, and the secondary base station controls the terminal to perform conditional handover of the secondary base station. In order to avoid repeated appearance of the base stations that meet the conditions in the candidate base stations of the primary base station and the candidate base stations of the negative base station, the base stations need to be negotiated and divided, which results in that one of the primary base station or the secondary base station of the terminal may not select the optimal base station, resulting in a decrease in the total throughput of the terminal. Summary of the invention

[0004] The embodiment of the present application provides a connection switching management system and method. On the one hand, the conditional switching of the terminal on the two connections of the main base station and the secondary base station can be uniformly controlled by the main base station, thereby ensuring the optimal base station selection on the two connections, which is beneficial to improving the throughput of the terminal; on the other hand, different connection switching management can be performed for different secondary base station addition types, which is beneficial to compatibility with more connection switching scenarios.

[0005] On the one hand, an embodiment of the present application provides a connection switching management system, the system comprising a terminal, a primary base station, a secondary base station, and a neighboring base station, wherein:

[0006] The primary base station is configured to send a measurement control message to the terminal;

[0007] The terminal is configured to perform measurement on the primary base station and the neighboring base station according to the measurement control message, obtain a measurement report, and send the measurement report to the primary base station;

[0008] The master base station is further used to screen, from the neighboring base stations according to the measurement report, a base station to be measured on which the terminal can perform conditional switching, and send a switching command message including a conditional switching configuration information element to the terminal, wherein the conditional switching configuration information element includes measurement target information and evaluation event information, the measurement target information includes an identifier of the base station to be measured, and the evaluation event information includes an event identifier, an entry condition, and a leaving condition of each evaluation event;

[0009] The terminal is further used to perform a conditional switching evaluation on the base station to be tested according to the switching command message, so as to determine a target primary base station and a target secondary base station to be switched from the base station to be tested, and perform a synchronization and random access process with the target primary base station, and send a switching completion message to the target primary base station after the execution is completed; wherein the target primary base station and the target secondary base station are different; the switching completion message includes the following parameters: an identifier of the target secondary base station and a type of added secondary base station, the value of the type of added secondary base station is set to add, indicating that a new secondary base station is added, and the value of the type of added secondary base station is set to change, indicating that a secondary base station is updated;

[0010] The target primary base station is configured to send a secondary base station adding request to the target secondary base station after receiving the switching completion message, and send a first switching success message or a second switching success message to the primary base station according to the value of the secondary base station adding type;

[0011] Among them, if the value of the type of adding the secondary base station is change, the first switching success message is sent; the first switching success message includes the following parameters: the identifier and release indication of the terminal, and the value of the release indication in the first switching success message is set to 0, indicating that the primary base station is required to release the context information related to the terminal;

[0012] If the value of the type of adding the secondary base station is set to add, the second switching success message is sent; the second switching success message includes the following parameters: the identifier and release indication of the terminal, and the value of the release indication in the second switching success message is set to 1, indicating that both the secondary base station and the primary base station are required to release the context information related to the terminal;

[0013] The primary base station is configured to release the context information related to the secondary base station and the terminal according to an instruction of the first handover success message; or, according to an instruction of the second handover success message, release the context information related to the primary base station and the terminal and request the secondary base station to release the context information related to the terminal;

[0014] The target primary base station is further configured to send a secondary base station configuration completion message to the terminal after receiving a secondary base station addition response from the target secondary base station;

[0015] The terminal is further configured to, if the value of the type of adding the secondary base station in the switching completion message is set to add, then after receiving the secondary base station configuration completion message, perform a synchronization and random access process with the target secondary base station, and perform data communication with the target secondary base station after the execution is completed; or, if the value of the type of adding the secondary base station in the switching completion message is set to change, then after receiving the secondary base station configuration completion message, directly perform data communication with the target secondary base station.

[0016] On the other hand, an embodiment of the present application proposes a connection switching management method applied to the above system, the method comprising:

[0017] The primary base station sends a measurement control message to the terminal;

[0018] The terminal performs measurement on the primary base station and the neighboring base station according to the measurement control message, obtains a measurement report, and sends the measurement report to the primary base station;

[0019] The master base station selects, from the neighboring base stations according to the measurement report, a base station to be measured on which the terminal can perform conditional switching, and sends a switching command message including a conditional switching configuration information element to the terminal, wherein the conditional switching configuration information element includes measurement target information and evaluation event information, the measurement target information includes an identifier of the base station to be measured, and the evaluation event information includes an event identifier, an entry condition, and an exit condition of each evaluation event;

[0020] The terminal performs a conditional switching evaluation on the base station to be tested according to the switching command message to determine a target primary base station and a target secondary base station to be switched from the base station to be tested, and performs a synchronization and random access process with the target primary base station, and sends a switching completion message to the target primary base station after the execution is completed; wherein the target primary base station and the target secondary base station are different; the switching completion message includes the following parameters: an identifier of the target secondary base station and a type of added secondary base station, the value of the type of added secondary base station is set to add, indicating that a new secondary base station is added, and the value of the type of added secondary base station is set to change, indicating that a secondary base station is updated;

[0021] After receiving the switching completion message, the target primary base station sends a secondary base station adding request to the target secondary base station, and sends a first switching success message or a second switching success message to the primary base station according to the value of the secondary base station adding type;

[0022] Among them, if the value of the type of adding the secondary base station is change, the first switching success message is sent; the first switching success message includes the following parameters: the identifier and release indication of the terminal, and the value of the release indication in the first switching success message is set to 0, indicating that the primary base station is required to release the context information related to the terminal;

[0023] If the value of the type of adding the secondary base station is set to add, the second switching success message is sent; the second switching success message includes the following parameters: the identifier and release indication of the terminal, and the value of the release indication in the second switching success message is set to 1, indicating that both the secondary base station and the primary base station are required to release the context information related to the terminal;

[0024] The primary base station releases the context information related to the terminal by the secondary base station according to the instruction of the first handover success message; or, according to the instruction of the second handover success message, releases the context information related to the terminal by the primary base station and requests the secondary base station to release the context information related to the terminal;

[0025] After receiving the secondary base station addition response from the target secondary base station, the target primary base station sends a secondary base station configuration completion message to the terminal;

[0026] When the value of the type of adding the secondary base station in the switching completion message is set to add, the terminal performs synchronization and random access procedures with the target secondary base station after receiving the secondary base station configuration completion message, and communicates data with the target secondary base station after the execution is completed; or, when the value of the type of adding the secondary base station in the switching completion message is set to change, after receiving the secondary base station configuration completion message, directly communicates data with the target secondary base station. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a flow chart of a connection switching management method according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The embodiment of the present application proposes a connection switching management system, the system comprising a terminal, a primary base station, a secondary base station, and an adjacent base station, the terminal establishes a dual connection with the primary base station and the secondary base station, wherein:

[0030] The primary base station is configured to send a measurement control message to the terminal.

[0031] The terminal is used to perform measurement on the main base station and the neighboring base stations according to the measurement control message, obtain a measurement report, and send the measurement report to the main base station.

[0032] Optionally, after receiving the measurement control message sent by the master base station, the master base station may perform measurement on the master base station and the neighboring base station according to the measurement target, report content and other information indicated in the measurement control message. The measurement target may be, for example, a specified measurement frequency; the report content may be, for example, RSRP (Reference Signal Receiving Power), RSRQ (Reference Signal Receiving Quality), and the like.

[0033] The main base station is also used to screen the base station to be tested that can be used by the terminal to perform conditional switching from the adjacent base stations according to the measurement report, and send a switching command message including a conditional switching configuration information element to the terminal, the conditional switching configuration information element includes measurement target information and evaluation event information, the measurement target information includes the identifier of the base station to be tested, and the evaluation event information includes the event identifier, entry condition and exit condition of each evaluation event.

[0034] Optionally, the method in which the main base station selects the base station to be tested for the terminal to perform conditional switching from the neighboring base stations according to the measurement report can be: sorting the neighboring base stations from large to small according to the parameter signal reception power or the reference signal reception quality, and selecting the best N as candidate base stations, where N is predefined according to experimental data. Further, the main base station sends a handover request message to each candidate base station, and if any candidate base station agrees to be the handover base station of the terminal, it sends a handover request ack as a response; after receiving the response message (handover request ack) of any candidate base station, the main base station determines any candidate base station as the base station to be tested.

[0035] The terminal is also used to perform a conditional switching evaluation on the base station to be tested according to the switching command message, so as to determine the target main base station and the target secondary base station to be switched from the base station to be tested, and perform a synchronization and random access process with the target main base station, and send a switching completion message to the target main base station after the execution is completed; wherein the target main base station and the target secondary base station are different; the switching completion message includes the following parameters: an identifier of the target secondary base station and a type of added secondary base station, the value of the type of added secondary base station is set to add, indicating that a new secondary base station is added, and the value of the type of added secondary base station is set to change, indicating that the secondary base station is updated.

[0036] Optionally, when the terminal performs conditional switching evaluation on the base station to be tested according to the switching command message and determines the target primary base station to be switched from the base station to be tested, it is specifically configured to:

[0037] Measure the cell of the main base station and the cells of each base station to be measured, and obtain the cell signal measurement value Mp of the main base station m , and the cell signal measurement value Mn of each base station to be tested i ; According to the cell signal measurement value Mn of each base station to be tested i , the cell signal measurement value Mp of the primary base station m A comparison and evaluation is performed with the entry conditions of each evaluation event. If any of the base stations to be tested meets the entry conditions of any of the evaluation events, and any of the base stations to be tested continues to meet the entry conditions of any of the evaluation events within the first preset time period, then any base station to be tested is added to the main base station optional list as a main base station optional base station, and then the target main base station is selected from the main base station optional list.

[0038] Among them, a feasible method for screening the target main base station can be: if there is only one main base station optional base station in the main base station optional list, then the main base station optional base station is used as the target main base station to be switched to; if there are multiple main base stations optional base stations in the base station optional list, then the one with the highest cell signal measurement value is used as the target main base station to be switched to.

[0039] Furthermore, after the terminal determines the main base station optional base station, the terminal can continuously measure each main base station optional base station in the main base station optional list. If it is detected that any main base station optional base station in the main base station optional list meets the leaving conditions of all evaluation events and continues to meet the leaving conditions of all evaluation events within the second preset time length, then any main base station optional base station will be deleted from the main base station optional list.

[0040] It can be understood that the above-mentioned first preset time length and second preset time length are both pre-configured according to experimental data, and their specific values ​​may be the same or different, and this application does not make any specific limitation on this.

[0041] Optionally, when the terminal performs conditional handover evaluation on the base station to be measured according to the handover command message and determines a target secondary base station to be handed over from the base station to be measured, the terminal is further specifically configured to:

[0042] Measure the cell of the secondary base station and the cell of the secondary base station to be measured, and obtain the cell signal measurement value Mp of the secondary base station s , and the cell signal measurement value Mn of the secondary base station to be tested j ; Among them, the auxiliary base station to be tested is the base station to be tested except the target main base station among the base stations to be tested;

[0043] According to the cell signal measurement value Mn of the secondary base station to be tested j , the cell signal measurement value Mp of the secondary base station s A comparison and evaluation is performed between the auxiliary base station to be tested and the entry conditions of each evaluation event. If any of the auxiliary base stations to be tested meets the entry conditions of any of the evaluation events, and any of the auxiliary base stations to be tested continues to meet the entry conditions of any of the evaluation events within the first preset time period, then any of the auxiliary base stations to be tested is added to the auxiliary base station optional list as an auxiliary base station optional base station, and the target auxiliary base station is screened from the auxiliary base station optional list; wherein, the method for screening the target auxiliary base station can refer to the above-mentioned method for screening the target main base station, which will not be repeated here.

[0044] Alternatively, if all the base stations in the secondary base station to be tested are not determined as the optional secondary base station, the secondary base station is determined as the target secondary base station.

[0045] Further optionally, after the terminal determines the auxiliary base station optional base station, it can continuously measure each auxiliary base station optional base station in the auxiliary base station optional list. If it is detected that any auxiliary base station optional base station in the auxiliary base station optional list meets the leaving conditions of all evaluation events and continues to meet the leaving conditions of all evaluation events within a second preset time length, then any auxiliary base station optional base station is deleted from the auxiliary base station optional list.

[0046] Among them, as a feasible method, the entry condition and exit condition of the above-mentioned evaluation event are associated with the target parameters, and the target parameters include one or more of the following parameters: Mn representing the cell signal measurement value of the adjacent base station, ON representing the cell signal compensation value of the adjacent base station, H representing the hysteresis value, Mp representing the cell signal measurement value of the current serving base station, Op representing the cell signal compensation value of the current serving base station, Off representing the compensation value specific to the evaluation event, and TH representing the threshold value defined by the evaluation event; the current serving base station is a main base station or a secondary base station.

[0047] As a feasible manner, the above-mentioned evaluation events include a first evaluation event, a second evaluation event and a third evaluation event, indicating that the threshold value TH defined by the evaluation event includes TH0, TH1 and TH2;

[0048] The entry condition corresponding to the first evaluation event is: Mn+ON-H>Mp+Op+Off, and the exit condition corresponding to the first evaluation event is: Mn+ON+H<Mp+Op+Off; the entry condition corresponding to the second evaluation event is: Mn+ON-H>Th, and the exit condition corresponding to the second evaluation event is: Mn+ON+H<Th;

[0049] The entry condition corresponding to the third evaluation event is: Mp+H<Th1 and Mn+ON-H>Th2, and the exit condition corresponding to the third evaluation event is: Mp-H>Th1 or Mn+ON+H<Th2.

[0050] Exemplarily, it is assumed that the system includes a main base station M-NB, a secondary base station S-NB, and the base stations to be tested include a first neighboring base station target NB1, a second neighboring base station target NB2, and a third neighboring base station target NB3, each evaluation event includes a first evaluation event, a second evaluation event, and a third evaluation event, and the threshold value TH defined by the evaluation event includes TH0, TH1, and TH2; the cell signal measurement value Mn of each base station to be tested iIncluding: the cell signal measurement value Mn1 corresponding to the first neighboring base station target NB1, the cell signal measurement value Mn2 corresponding to the second neighboring base station target NB2, and the cell signal measurement value Mn3 corresponding to the third neighboring base station target NB3; the event identifiers, entry conditions, and exit conditions corresponding to the first evaluation event, the second evaluation event, and the third evaluation event are shown in Table 1:

[0051] Table 1

[0052] Event ID Entry conditions Leave conditions A3 Mn+ON-H>Mp+Op+Off Mn+ON+H<Mp+Op+Off A4 Mn+ON-H>Th0 Mn+ON+H<Th0 A5 Mp+H<Th1 and Mn+ON-H>Th2 Mp-H>Th1 or Mn+ON+H<Th2

[0053] Among them, A3 is the event identifier corresponding to the first evaluation event, A4 is the event identifier corresponding to the second evaluation event, and A5 is the event identifier corresponding to the third evaluation event. The terminal measures the cells of the main base station M-NB and the base stations to be measured target NB1, targetNB2 and target NB3, and obtains the cell signal measurement value Mp of the main base station m , the cell signal measurement value Mn1 of the target NB1, the cell signal measurement value Mn2 of the target NB2, and the cell signal measurement value Mn3 of the target NB3 are compared and evaluated according to the entry conditions of events A3, A4, and A5. Specifically, when evaluating the target NB1, Mp m As Mp in Table 1, Mn1 is used as Mn in Table 1; when evaluating the target base station NB2, Mp is used as m As Mp in Table 1, Mn2 is used as Mn in Table 1; when evaluating the target base station NB3, Mp is used as m As Mp in Table 1, Mn3 is taken as Mn in Table 1.

[0054] After evaluation, it is found that the base station target NB1 to be tested meets the entry conditions of any one of the events, then the timer is triggered. If the base station target NB1 to be tested is continuously detected to meet the entry conditions of any one of the events within a first preset time period (for example, 1 minute) (for example, the base station target NB1 to be tested is detected 10 times within 1 minute to meet the entry conditions of any one of the events, where 10 is predefined and can be adjusted according to actual needs), then the base station target NB1 to be tested is added to the main base station optional list as a main base station optional base station.

[0055] After adding target NB1 as a master base station optional base station to the master base station optional list, continue to measure target NB1 and set Mp mAs Mp in Table 1, Mn1 is used as Mn in Table 1. After evaluation, it is found that the base station target NB1 to be tested meets the leaving conditions of all evaluation events, then the timer is triggered. If targetNB1 is continuously detected to meet the leaving conditions of all evaluation events within the second preset time period (for example, target NB1 is detected to meet the leaving conditions of all evaluation events 10 times within 1 minute), then target NB1 is deleted from the optional list of the main base station.

[0056] Furthermore, the same detection as target NB1 is performed on the target NB2 and target NB3 to be tested. Assume that the final evaluation result is that target NB1 is the target primary base station, and target NB2 and target NB3 are not selected. After target NB1 is determined as the target primary base station, the terminal will use target NB2 and targetNB3 other than target NB1 as secondary base stations to be tested, and further evaluate whether there are optional secondary base stations. The specific method of evaluation is:

[0057] Measure the cell of the secondary base station S-NB and the cells of target NB2 and target NB3 to obtain the cell signal measurement value Mp of the secondary base station s , the cell signal measurement value Mn2 of target NB2 and the cell signal measurement value Mn3 of target NB3. When evaluating the secondary base station target NB2, Mp s As Mp in Table 1, Mn2 is used as Mn in Table 1; when evaluating the secondary base station target NB3, Mp is used as s As Mp in Table 1, Mn3 is taken as Mn in Table 1. This is similar to the method for evaluating the optional primary base station, and will not be repeated here.

[0058] If neither the target NB2 nor the target NB3 is screened as a selectable secondary base station, the original secondary base station S-NB is used as the target secondary base station.

[0059] Optionally, if the terminal evaluates a target primary base station and a target secondary base station that are different from the original primary base station and the secondary base station, the value of the parameter Add secondary base station type is set to add, indicating that a new secondary base station is added; if the terminal evaluates a target primary base station that is different from the original primary base station, but does not evaluate a target secondary base station that is different from the original secondary base station (that is, the original secondary base station is determined as the target secondary base station), the value of the parameter Add secondary base station type is set to change, indicating that the secondary base station is updated. Here, the so-called updating of the secondary base station can be understood as: updating the primary-secondary relationship between the original secondary base station and the original primary base station to the primary-secondary relationship with the target primary base station.

[0060] The target primary base station is configured to send a secondary base station adding request to the target secondary base station after receiving the switching completion message, and send a first switching success message or a second switching success message to the primary base station according to the value of the added secondary base station type.

[0061] Among them, if the value of adding the auxiliary base station type is change, the first switching success message is sent; the first switching success message includes the following parameters: the terminal identifier and release indication, and the value of the release indication in the first switching success message is set to 0, indicating that the main base station needs to release the context information related to the terminal.

[0062] If the value of adding the secondary base station type is set to add, a second switching success message is sent; the second switching success message includes the following parameters: the terminal identifier and release indication, and the value of the release indication in the second switching success message is set to 1, indicating that both the secondary base station and the primary base station need to release the context information related to the terminal.

[0063] The primary base station is configured to release its own context information related to the terminal according to the instruction of the first switching success message; or, according to the instruction of the second switching success message, release its own context information related to the terminal and request the secondary base station to release the context information related to the terminal.

[0064] Optionally, the system may further include a core network node. When the primary base station releases its own context information related to the terminal and requests the secondary base station to release the context information related to the terminal according to the instruction of the second handover success message, the primary base station may also receive a data packet reception status forwarding message sent by the secondary base station, wherein the data packet reception status forwarding message includes the first data packet information that the secondary base station has not successfully sent to the terminal; and the second data packet information that the primary base station has not successfully sent to the terminal and the first data packet information from the secondary base station are combined and sent to the target primary base station. The first data packet information may be, for example, the number of the data packet that the secondary base station has not successfully sent to the terminal, and the second data packet information may be, for example, the number of the data packet that the primary base station has not successfully sent to the terminal.

[0065] The target primary base station sends a secondary base station reconfiguration completion message to the target secondary base station to indicate that the switching is completed, and sends a path switching message to the core network node, where the path switching message includes the first data packet information, the second data packet information, and the distribution indication information. The distribution indication information is used to instruct the core network node to send the first unsent data corresponding to the first data packet information to the target secondary base station, and to send the second unsent data corresponding to the second data packet information to the target primary base station.

[0066] Further, the core network node may send first unsent data to the target secondary base station and second unsent data to the target primary base station according to the instruction of the path switching message, and then the target secondary base station sends the first unsent message to the terminal and the target primary base station sends the second unsent message to the terminal.

[0067] Alternatively, if the primary base station receives the first switching success message, the primary base station may also send the second data packet information that the primary base station has not successfully sent to the terminal to the target primary base station after releasing its own context information related to the terminal according to the instruction of the first switching success message. After the target primary base station receives the second data packet information, it sends a secondary base station reconfiguration completion message to the target secondary base station to indicate that the switching is complete, and sends a path switching message to the core network node. The path switching message includes the second data packet information and distribution indication information, and the distribution indication information is used to instruct the core network node to send the second unsent data corresponding to the second data packet information to the target primary base station.

[0068] After receiving the path switching message, the core network node sends the second unsent data to the target primary base station according to the instruction of the path switching message, and then the target primary base station sends the second unsent data to the terminal.

[0069] The target primary base station is further configured to send a secondary base station configuration completion message to the terminal after receiving a secondary base station addition request response from the target secondary base station. Optionally, after sending a secondary base station addition request to the target secondary base station, the target primary base station can receive a secondary base station addition request response sent by the target secondary base station, thereby confirming that the target secondary base station is added successfully.

[0070] The terminal is further configured to, if the value of the secondary base station type added in the switching completion message is set to add, then after receiving the secondary base station configuration completion message, perform synchronization and random access procedures with the target secondary base station, and communicate data with the target secondary base station after the execution is completed; or, if the value of the secondary base station type added in the switching completion message is set to change, then after receiving the secondary base station configuration completion message, directly communicate data with the target secondary base station.

[0071] See also Figure 1 The embodiment of the present application proposes a connection switching management method, which can be applied to the above-mentioned connection switching management system. The method includes:

[0072] S10: The primary base station sends a measurement control message to the terminal.

[0073] S11: The terminal performs measurement on the master base station and the neighboring base stations according to the measurement control message, obtains a measurement report, and sends the measurement report to the master base station.

[0074] S12: The main base station selects a base station to be measured from adjacent base stations based on the measurement report, and sends a switching command message including a conditional switching configuration information element to the terminal. The conditional switching configuration information element includes measurement target information and evaluation event information. The measurement target information includes the identifier of the base station to be measured, and the evaluation event information includes the event identifier, entry condition and exit condition of each evaluation event.

[0075] S13: The terminal performs a conditional switching evaluation on the base station to be tested according to the switching command message to determine the target primary base station and the target secondary base station to be switched from the base station to be tested, and performs synchronization and random access processes with the target primary base station, and sends a switching completion message to the target primary base station after the execution is completed; wherein the target primary base station and the target secondary base station are different; the switching completion message includes the following parameters: an identifier of the target secondary base station and a type of added secondary base station, wherein the value of the type of added secondary base station is set to add, indicating that a new secondary base station is added, and the value of the type of added secondary base station is set to change, indicating that the secondary base station is updated.

[0076] Optionally, the terminal performs a conditional switching evaluation on the base station to be tested according to the switching command message, and the implementation method of determining the target main base station to be switched from the base stations to be tested can be: measuring the cell of the main base station and the cells of each base station to be tested, and obtaining the cell signal measurement value Mpm of the main base station, and the cell signal measurement value Mni of each base station to be tested; comparing and evaluating the cell signal measurement value Mni of each base station to be tested, the cell signal measurement value Mpm of the main base station and the entry conditions of each evaluation event; if any base station to be tested among the base stations to be tested meets the entry conditions of any evaluation event in each evaluation event, and any base station to be tested continues to meet the entry conditions of any evaluation event in each evaluation event within the first preset time length, then any base station to be tested is added to the main base station optional list as an optional main base station, and then the target main base station is screened from the main base station optional list.

[0077] Among them, a feasible method for screening the target main base station can be: if there is only one main base station optional base station in the main base station optional list, then the main base station optional base station is used as the target main base station to be switched to; if there are multiple main base stations optional base stations in the base station optional list, then the one with the highest cell signal measurement value is used as the target main base station to be switched to.

[0078] Furthermore, after the terminal determines the main base station optional base station, the terminal can continuously measure each main base station optional base station in the main base station optional list. If it is detected that any main base station optional base station in the main base station optional list meets the leaving conditions of all evaluation events and continues to meet the leaving conditions of all evaluation events within the second preset time length, then any main base station optional base station will be deleted from the main base station optional list.

[0079] Optionally, the terminal performs conditional handover evaluation on the base station to be measured according to the handover command message, and determines the target secondary base station to be handed over from the base station to be measured in the following manner:

[0080] Measuring a cell of the secondary base station and a cell of the secondary base station to be tested, obtaining a cell signal measurement value Mps of the secondary base station and a cell signal measurement value Mnj of the secondary base station to be tested; wherein the secondary base station to be tested is a base station to be tested except the target primary base station among the base stations to be tested;

[0081] A comparison and evaluation is performed based on the cell signal measurement value Mnj of the auxiliary base station to be tested, the cell signal measurement value Mps of the auxiliary base station and the entry conditions of each evaluation event. If any of the auxiliary base stations to be tested meets the entry conditions of any of the evaluation events, and any of the auxiliary base stations to be tested continues to meet the entry conditions of any of the evaluation events within the first preset time period, then any of the auxiliary base stations to be tested is added to the auxiliary base station optional list as an auxiliary base station optional base station, and the target auxiliary base station is screened from the auxiliary base station optional list; wherein, the method for screening the target auxiliary base station can refer to the above-mentioned method for screening the target main base station, which will not be repeated here.

[0082] Alternatively, if all the base stations in the secondary base station to be tested are not determined as the optional secondary base station, the secondary base station is determined as the target secondary base station.

[0083] Further optionally, after the terminal determines the auxiliary base station optional base station, it can continuously measure each auxiliary base station optional base station in the auxiliary base station optional list. If it is detected that any auxiliary base station optional base station in the auxiliary base station optional list meets the leaving conditions of all evaluation events and continues to meet the leaving conditions of all evaluation events within a second preset time length, then any auxiliary base station optional base station is deleted from the auxiliary base station optional list.

[0084] S14: after receiving the handover completion message, the target primary base station sends a secondary base station adding request to the target secondary base station, and sends a first handover success message or a second handover success message to the primary base station according to the value of the added secondary base station type.

[0085] Among them, if the value of the added secondary base station type is change, the first switching success message is sent; the first switching success message includes the following parameters: the identifier and release indication of the terminal, and the value of the release indication in the first switching success message is set to 0, indicating that the primary base station needs to release the context information related to the terminal;

[0086] If the value of the type of adding the secondary base station is set to add, a second switching success message is sent; the second switching success message includes the following parameters: the identifier and release indication of the terminal, and the value of the release indication in the second switching success message is set to 1, indicating that both the secondary base station and the primary base station need to release the context information related to the terminal;

[0087] S15: The primary base station releases context information related to the terminal according to the instruction of the first switching success message; or, according to the instruction of the second switching success message, releases context information related to the terminal and requests the secondary base station to release context information related to the terminal.

[0088] S16: After receiving the secondary base station adding request response from the target secondary base station, the target primary base station sends a secondary base station configuration completion message to the terminal.

[0089] After the primary base station releases its own context information related to the terminal and requests the secondary base station to release the context information related to the terminal according to the instruction of the second handover success message, the primary base station can also receive a data packet reception status forwarding message sent by the secondary base station, the data packet reception status forwarding message including the first data packet information that the secondary base station failed to send to the terminal; the second data packet information that the primary base station failed to send to the terminal and the first data packet information from the secondary base station are combined and sent to the target primary base station. The first data packet information can be, for example, the number of the data packet that the secondary base station failed to send to the terminal, and the second data packet information can be, for example, the number of the data packet that the primary base station failed to send to the terminal.

[0090] The target primary base station may send a secondary base station reconfiguration completion message to the target secondary base station to indicate that the switching is completed, send a secondary base station configuration completion message to the terminal, and send a path switching message to the core network node, wherein the path switching message includes the first data packet information, the second data packet information, and the distribution indication information. Among them, the distribution indication information is used to instruct the core network node to send the first unsent data corresponding to the first data packet information to the target secondary base station, and send the second unsent data corresponding to the second data packet information to the target primary base station.

[0091] Further, the core network node may send first unsent data to the target secondary base station and second unsent data to the target primary base station according to the instruction of the path switching message, and then the target secondary base station sends the first unsent message to the terminal and the target primary base station sends the second unsent message to the terminal.

[0092] Alternatively, as another feasible implementation, if the primary base station receives the first switching success message, then the primary base station may also send the second data packet information that the primary base station has not successfully sent to the terminal to the target primary base station after releasing its own context information related to the terminal according to the instruction of the first switching success message. After the target primary base station receives the second data packet information, it sends a secondary base station reconfiguration completion message to the target secondary base station to indicate that the switching is complete, sends a secondary base station configuration completion message to the terminal, and sends a path switching message to the core network node. The path switching message includes the second data packet information and distribution indication information, and the distribution indication information is used to instruct the core network node to send the second unsent data corresponding to the second data packet information to the target primary base station.

[0093] After receiving the path switching message, the core network node sends the second unsent data to the target primary base station according to the instruction of the path switching message, and then the target primary base station sends the second unsent data to the terminal.

[0094] S17: when the value of the secondary base station type added in the switching completion message is set to add, after receiving the secondary base station configuration completion message, the terminal performs synchronization and random access procedures with the target secondary base station, and communicates data with the target secondary base station after the execution is completed; or, when the value of the secondary base station type added in the switching completion message is set to change, after receiving the secondary base station configuration completion message, directly communicates data with the target secondary base station.

[0095] In the embodiment of the present application, on the one hand, the conditional switching of the terminal on the two connections of the main base station and the secondary base station can be uniformly controlled by the main base station, thereby ensuring the optimal base station selection on the two connections, which is beneficial to improving the throughput of the terminal; on the other hand, different connection switching management can be performed for different secondary base station addition types, which is beneficial to compatibility with more connection switching scenarios.

[0096] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0097] The above disclosure is only part of the embodiments of the present application, which certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and making equivalent changes according to the claims of this application are still within the scope of the invention.

Claims

1. A connection switching management method, characterized in that: The method is applied to a connection switching management system, the system comprising a terminal, a primary base station, a secondary base station, and an adjacent base station, and the method comprises: The primary base station sends a measurement control message to the terminal; The terminal performs measurement on the primary base station and the neighboring base station according to the measurement control message, obtains a measurement report, and sends the measurement report to the primary base station; The master base station selects, from the neighboring base stations according to the measurement report, a base station to be measured on which the terminal can perform conditional switching, and sends a switching command message including a conditional switching configuration information element to the terminal, wherein the conditional switching configuration information element includes measurement target information and evaluation event information, the measurement target information includes an identifier of the base station to be measured, and the evaluation event information includes an event identifier, an entry condition, and an exit condition of each evaluation event; The terminal performs a conditional switching evaluation on the base station to be tested according to the switching command message to determine a target primary base station and a target secondary base station to be switched from the base station to be tested, and performs a synchronization and random access process with the target primary base station, and sends a switching completion message to the target primary base station after the execution is completed; wherein the target primary base station and the target secondary base station are different; the switching completion message includes the following parameters: an identifier of the target secondary base station and a type of added secondary base station, the value of the type of added secondary base station is set to add, indicating that a new secondary base station is added, and the value of the type of added secondary base station is set to change, indicating that a secondary base station is updated; After receiving the switching completion message, the target primary base station sends a secondary base station adding request to the target secondary base station, and sends a first switching success message or a second switching success message to the primary base station according to the value of the secondary base station adding type; Among them, if the value of the type of adding the secondary base station is change, the first switching success message is sent; the first switching success message includes the following parameters: the identifier and release indication of the terminal, and the value of the release indication in the first switching success message is set to 0, indicating that the primary base station is required to release the context information related to the terminal; If the value of the type of adding the secondary base station is set to add, the second switching success message is sent; the second switching success message includes the following parameters: the identifier and release indication of the terminal, and the value of the release indication in the second switching success message is set to 1, indicating that both the secondary base station and the primary base station are required to release the context information related to the terminal; The primary base station releases the context information related to the primary base station and the terminal according to an instruction of the first handover success message; or, according to an instruction of the second handover success message, releases the context information related to the primary base station and the terminal and requests the secondary base station to release the context information related to the terminal; After receiving the secondary base station addition request response from the target secondary base station, the target primary base station sends a secondary base station configuration completion message to the terminal; When the value of the type of adding the secondary base station in the switching completion message is set to add, the terminal performs synchronization and random access procedures with the target secondary base station after receiving the secondary base station configuration completion message, and communicates data with the target secondary base station after the execution is completed; or, when the value of the type of adding the secondary base station in the switching completion message is set to change, after receiving the secondary base station configuration completion message, directly communicates data with the target secondary base station.

2. The method according to claim 1, characterized in that The terminal performs conditional switching evaluation on the base station to be tested according to the switching command message to determine a target primary base station to be switched from the base station to be tested, including: The terminal measures the cell of the primary base station and the cells of each base station to be measured, and obtains the cell signal measurement value Mp of the primary base station m , and the cell signal measurement value Mn of each base station to be tested i ; The terminal measures the cell signal value Mn of each base station to be tested. i , the cell signal measurement value Mp of the primary base station m and the entry conditions of each evaluation event, if any of the base stations to be tested meets the entry conditions of any of the evaluation events, and any of the base stations to be tested continues to meet the entry conditions of any of the evaluation events within a first preset time, then any of the base stations to be tested is added to the main base station optional list as a main base station optional base station; The terminal selects a target master base station from the master base station selectable list.

3. The method according to claim 2, characterized in that The method further comprises: The terminal continuously measures each main base station optional base station in the main base station optional list. If it is detected that any main base station optional base station in the main base station optional list meets the leaving conditions of all evaluation events and continues to meet the leaving conditions of all evaluation events within a second preset time length, then the any main base station optional base station is deleted from the main base station optional list.

4. The method according to claim 2, characterized in that The terminal performs conditional handover evaluation on the base station to be tested according to the handover command message to determine a target secondary base station from the base station to be tested, including: The terminal measures the cell of the secondary base station and the cell of the secondary base station to be measured, and obtains the cell signal measurement value Mp of the secondary base station s , and the cell signal measurement value Mn of the secondary base station to be tested j ; Wherein, the secondary base station to be tested is a base station to be tested among the base stations to be tested except the target primary base station; The terminal measures the cell signal value Mn of the secondary base station to be tested according to the cell signal value Mn of the secondary base station to be tested j , the cell signal measurement value Mp of the secondary base station s and the entry conditions of each evaluation event, if any secondary base station to be tested among the secondary base stations to be tested meets the entry conditions of any evaluation event in the evaluation events, and within a first preset time period, any secondary base station to be tested continues to meet the entry conditions of any evaluation event in the evaluation events, then any secondary base station to be tested is added to the secondary base station optional list as a secondary base station optional base station, and a target secondary base station is screened from the secondary base station optional list; Alternatively, if all base stations in the secondary base station to be tested are not determined as optional secondary base stations, the terminal determines the secondary base station as a target secondary base station.

5. The method according to claim 4, characterized in that The method further comprises: The terminal continuously measures each secondary base station optional base station in the secondary base station optional list. If it is detected that any secondary base station optional base station in the secondary base station optional list satisfies the leaving conditions of all evaluation events and continues to satisfy the leaving conditions of all evaluation events within a second preset time length, then the any secondary base station optional base station is deleted from the secondary base station optional list.

6. The method according to claim 1, characterized in that The entry condition and the exit condition of the evaluation event are associated with a target parameter, and the target parameter includes one or more of the following parameters: Mn represents the cell signal measurement value of the adjacent base station, ON represents the cell signal compensation value of the adjacent base station, H represents the hysteresis value, Mp represents the cell signal measurement value of the current serving base station, Op represents the cell signal compensation value of the current serving base station, Off represents the compensation value specific to the evaluation event, and TH represents the threshold value defined by the evaluation event; the current serving base station is the primary base station or the secondary base station.

7. The method according to claim 6, characterized in that The evaluation events include a first evaluation event, a second evaluation event and a third evaluation event, and the threshold value TH representing the definition of the evaluation event includes TH0, TH1 and TH2; The entry condition corresponding to the first evaluation event is: Mn+ON-H>Mp+Op+Off, and the exit condition corresponding to the first evaluation event is: Mn+ON+H<Mp+Op+Off; The entry condition corresponding to the second evaluation event is: Mn+ON-H>Th, and the exit condition corresponding to the second evaluation event is: Mn+ON+H<Th; The entry condition corresponding to the third evaluation event is: Mp+H<Th1 and Mn+ON-H>Th2, and the exit condition corresponding to the third evaluation event is: Mp-H>Th1 or Mn+ON+H<Th2.

8. The method according to claim 1, characterized in that After the primary base station releases the context information related to the terminal and requests the secondary base station to release the context information related to the terminal according to the instruction of the second handover success message, the method further includes: The primary base station receives a data packet reception status forwarding message sent by the secondary base station, wherein the data packet reception status forwarding message includes first data packet information that the secondary base station fails to send to the terminal; and combines second data packet information that the primary base station fails to send to the terminal with the first data packet information from the secondary base station and sends them to the target primary base station; The target primary base station sends a secondary base station reconfiguration completion message to the target secondary base station to indicate that the switching is completed, and sends a path switching message to the core network node, where the path switching message includes the first data packet information, the second data packet information and distribution indication information; the distribution indication information is used to instruct the core network node to send the first unsent data corresponding to the first data packet information to the target secondary base station; and send the second unsent data corresponding to the second data packet information to the target primary base station; The core network node sends the first unsent data to the target secondary base station according to an instruction of the path switching message, and sends the second unsent data to the target primary base station; The target secondary base station sends the first unsent data to the terminal; and the target primary base station sends the second unsent data to the terminal.

9. The method according to claim 1, characterized in that After the primary base station releases the context information related to the terminal according to the instruction of the first handover success message, the method further includes: The primary base station sends, to the target primary base station, information about a second data packet that the primary base station fails to send to the terminal; The target primary base station sends a secondary base station reconfiguration completion message to the target secondary base station to indicate that the switching is completed, and sends a path switching message to the core network node, where the path switching message includes the second data packet information and distribution indication information; the distribution indication information is used to instruct the core network node to send the second unsent data corresponding to the second data packet information to the target primary base station; The core network node sends the second unsent data to the target primary base station according to an instruction of the path switching message; The target primary base station sends the second unsent data to the terminal.

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