CN106941702B - Method for realizing switching time detection control of mobile communication terminal device - Google Patents

Method for realizing switching time detection control of mobile communication terminal device Download PDF

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CN106941702B
CN106941702B CN201710255845.9A CN201710255845A CN106941702B CN 106941702 B CN106941702 B CN 106941702B CN 201710255845 A CN201710255845 A CN 201710255845A CN 106941702 B CN106941702 B CN 106941702B
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sfn
target cell
cell
test instrument
source cell
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CN106941702A (en
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邓习锋
李耀华
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Transcom Shanghai Technologies Co Ltd
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Shanghai TransCom Instruments Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Abstract

The invention relates to a method for realizing the detection control of the switching time of a mobile communication terminal device, which is based on a test instrument and shares the same clock for two simulation cells, thereby leading a source cell and a target cell to have the same trigger signal (5ms trigger signal), ensuring the synchronization of the starting positions of SFN system frames between the source cell and the target cell, and acquiring the direct frame number difference between the source cell and the target cell by sending an SFN query instruction to the source cell and the target cell; and the test instrument calculates the time delay required by the terminal to be tested to execute the switching between the source cell and the target cell by acquiring the frame number difference of the switching instruction issuing time and the access initiating time of the terminal to be tested in the target cell and combining the frame number offset between the source cell and the target cell.

Description

Method for realizing switching time detection control of mobile communication terminal device
Technical Field
The invention relates to the LTE field, in particular to the technical field of switching time detection in the LTE field, and specifically relates to a method for realizing switching time detection control of a mobile communication terminal device.
Background
In the performance test of the mobile terminal to be tested, the switching time of the terminal to be tested in the connection state is an important detection index. For example, for a TD-lte (time Division Long Term evolution) terminal to be tested, because the bandwidth of the system is large and the transmission rate of air interface data is fast, at this time, time index detection for air interface switching of the terminal to be tested in a data or voice connection state is very important.
The switching time of the TD-LTE terminal to be tested is rrm (radio Resource management) of the terminal to be tested, i.e. a test index in the radio Resource management capability, and the specific test method and test index are clearly defined in the 3GPP TS 36.521-3 specification.
The SFN Frame Number (System Frame Number) is information read from a P-CCPCH (primary common control physical channel) when the UE performs cell synchronization.
For the switching delay of the terminal to be tested, the time length specified in the standard is from the end of sending the RRC Connection configuration message designating the UE for switching from the source cell on the network side to the end of receiving the MSG1 message on the uplink PRACH channel by the target cell.
The length of the time Dhandover satisfies the following formula:
Dhandover≤maximum RRC procedure delay+Tinterrupt；
wherein: tinterupt Tsearch + TIU +20 ms; tsearch is 0;
TIU＝15ms，since 10ms due to uncertainty in frame and 5ms additionaldelay due to PRACH transmission occasion；
Maximum RRC procedure delay＝15ms as defined in TS 36.331[5]clause11.2；
from the above, it can be seen that the time range of the indicator should be within 50ms, and the accuracy requirement of the measurement is very high.
In the prior art, the handover test of the terminal to be tested may be performed based on a base station or a test instrument. The following are two switching time detection schemes:
switching time detection scheme 1: and testing the switching time delay of the terminal to be tested by utilizing the actual base station equipment.
For the test performed under the base station, the terminal to be tested executes the switching signaling process between different cells (used as a source cell and a target cell) constructed under the base station, and observes the time point or the frame number when the source cell sends a downlink message and the target cell receives an uplink PRACH message at an internal traue interface of the base station side, and the time difference between the two is the time delay for the terminal to be tested to execute the switching process. When the technical scheme is used for testing, the supporting service of a base station (network side) equipment provider or an operator is required, and the method is inconvenient for most terminal developers or laboratories to be tested. Therefore, the scheme can only be used in a few scenarios, such as the detection tests of the joint debugging laboratory of the network manufacturer, the detection tests of the operator and the certification laboratory, and the like, and is practically difficult to be used in the development and debugging tests of the chip and the terminal to be tested.
Switching time detection scheme 2: and testing the switching time delay of the terminal to be tested by using the test instrument to simulate the network environment.
In the actual development and verification link of the terminal to be tested, a test instrument is widely used for simulating a network to test the terminal to be tested, and the function and performance indexes of the terminal to be tested are verified.
For a switching test scenario based on a test instrument, the currently used technology in the test instrument is to record the time point when a source cell on a network side sends a downlink switching message and the time point when the test instrument receives an uplink PRACH message in a target cell, and the switching delay of a terminal to be tested can be obtained by subtracting the two time points. Since the reporting of the position at the time point may be performed by one of the layers L1/L2/L3 on the network side, and the difference between the time reference points between the two cells is difficult to measure, the time error caused thereby affects the accuracy of the measurement result.
In the switching time detection scheme 1, because special base station equipment and a corresponding TRACE tool are required for support, the cost for building a test environment is very high, and the method is difficult to popularize and popularize to a common terminal to be tested and a chip development test scene.
The time delay test scheme used in the switching time detection scheme 2 has low accuracy of the measurement result and high uncertainty because the acquisition of the point between the start and the end and the accuracy of the absolute time difference between two cells are difficult to guarantee.
Disclosure of Invention
The present invention is to overcome the above disadvantages in the prior art, and provide a method for detecting and controlling the switching time of a mobile communication terminal device by counting the system frame number SFN and detecting the switching time of a terminal to be detected by using the synchronization characteristics between LTE cells and the uniqueness of the system frame number SFN in a cell, so as to avoid the errors caused by the instability of absolute time and the system processing delay in the prior art.
In order to achieve the above object, the method for detecting and controlling the switching time of the mobile communication terminal device of the present invention specifically comprises the following steps:
the method for realizing the switching time detection control of the mobile communication terminal device is mainly characterized in that the switching time detection method is based on a test instrument and comprises the following steps:
(1) the test instrument establishes two cells which are respectively a source cell and a target cell, and provides the same clock for the source cell and the target cell so that the source cell and the target cell have the same trigger signal;
(2) the source cell sends a switching message to a terminal to be tested and reports an SFN frame and a subframe number for sending the switching message to a test instrument; the target cell sends SFN frame and subframe number of the received message on the PRACH physical random access channel to a test instrument;
(3) and (3) the test instrument acquires the switching time delay in the switching process according to the SFN frame and the subframe number acquired in the step (2).
Preferably, the step (1) further includes configuring, by the test instrument, the source cell and the target cell, where the configuring specifically includes:
the test instrument sets the parameters of the source cell and the target cell, so that the parameters of the source cell and the target cell meet the conditions for searching and accessing the terminal to be tested.
Preferably, the step (2) further comprises the following steps before:
and (2.0) the test instrument acquires the SFN interframe offset and the subframe offset of the source cell and the target cell at the same moment in an SFN query mode.
More preferably, the step (2.0) is specifically:
the method comprises the steps that a test instrument simultaneously sends an SNF query instruction to a source cell and a target cell, the source cell and the target cell receive the instruction, and report respective SFN frame numbers and subframe numbers at the moment when a next clock trigger signal of the instruction arrives according to the clock trigger signal, the SFN frame number of the source cell is SFN _ num1, the subframe number of the source cell is sub _ SFN _ num1, the SFN frame number of the target cell is SFN _ num2, and the subframe number of the target cell is sub _ SFN _ num2, the test instrument obtains SFN offset and subframe offset FN _ Soffset between the source cell and the target cell according to the SFN frame numbers and the subframe numbers of the source cell and the target cell, wherein the SFN offset is specifically as follows:
FN_SFN_offset＝SFN_num2－SFN_num1；
the sub-frame offset is as follows:
FN_sub_offset＝sub_sfn_num2－sub_sfn_num1；
the FN _ SFN _ offset is an inter-SFN offset between the source cell and the target cell, and the FN _ sub _ offset is an inter-subframe offset between the source cell and the target cell.
More preferably, the step (2.0) is preceded by the steps of:
(2.0.0) the terminal to be tested registers and accesses in the source cell, and acquires the parameters of the target cell through the broadcast message of the source cell; the test instrument configures the relevant parameters of the target cell to enable the target cell to meet the conditions for executing the switching process, and the terminal to be tested informs the network side that the target cell meets the conditions for executing the switching process.
Preferably, the configuration of the relevant parameters of the target cell by the test instrument specifically includes:
the test instrument increases the power of the downlink common channel of the target cell to meet the condition of executing the switching process.
More preferably, the handover message is an RRC Connection configuration message, and the step (2) specifically includes:
the source cell sends an RRC Connection reconfiguration message to a terminal to be tested, and reports and sends an SFN frame number SFN _ num _ source of the RRC Connection reconfiguration message and a subframe number sub _ SFN _ source to a test instrument;
the terminal to be tested configures air interface resources according to a switching message instruction, initiates an access process to the target cell, sends an MSG1 message to the target cell through a PRACH physical random access channel, and reports an SFN frame number SFN _ num _ target and a subframe number sub _ SFN _ target of the received MSG1 message to a test instrument by the target cell.
Preferably, the clock trigger signal is a periodic trigger signal, and the period of the periodic trigger signal is 5 ms.
Preferably, the source cell and the target cell are both TDD cells, and the test instrument in step (3) obtains the switching delay in the switching process according to the following formula:
Dhandover＝[SFN_num_target－SFN_num_source－(SFN_num2－SFN_num1)]×10+[sub_sfn_target－sub_sfn_source－(sub_sfn_num2－sub_sfn_num1)]×1；
wherein D ishandoverIs the switching time delay in the switching process, and DhandoverThe unit of (c) is ms.
The method for realizing the detection control of the switching time of the mobile communication terminal device utilizes the synchronization characteristic between cells and the uniqueness of a system frame number SFN in the cells in a network environment constructed by a test instrument to detect the switching time of the terminal to be detected by counting the frame number, thereby avoiding the error caused by the instability of absolute time and the processing time delay of a system in the prior scheme. Compared with the scheme of absolute time difference adopted in the prior art, the method has great convenience. Under the scheme of the prior art, a user can only calculate time delay by measuring the arrival time point of a message, and cannot exclude the difference of transmission time from the notification of a physical layer to the arrival of the message at a main control unit of a test instrument, so that the execution efficiency of a bottom protocol stack and a high-level program of the test instrument can have great influence on the measurement of the time delay; in addition, if the absolute time difference is used to detect the switching delay, the test instrument cannot ensure the time reference synchronization between cells through the GPS clock reference and other methods, and errors may be generated in calculating the delay. The method for realizing the switching time detection control of the mobile communication terminal device does not need the support of a core network, is not limited by the cross-system of FDD and TDD-LTE base stations, and is simple and convenient. The method can effectively simplify the construction mode of the test environment, reduce the test cost, improve the precision and stability of the switching time delay measurement of the terminal to be tested, and simplify the difficulty of switching time detection.
Drawings
Fig. 1 is a flowchart of a calculation process of a method for implementing a handover time detection control of a mobile communication terminal device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a source cell and a target cell not having the same 5ms trigger signal in the method for controlling handover time detection of a mobile communication terminal according to the present invention
Fig. 3 is a schematic diagram of a source cell and a target cell having the same 5ms trigger signal in the method for implementing the handover time detection control of the mobile communication terminal device according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The method for realizing the switching time detection control of the mobile communication terminal device is based on a test instrument and comprises the following steps:
(1) the test instrument establishes two cells which are respectively a source cell and a target cell, and provides the same clock for the source cell and the target cell so that the source cell and the target cell have the same trigger signal;
(2) the source cell sends a switching message to a terminal to be tested and reports an SFN frame and a subframe number for sending the switching message to a test instrument; the target cell sends SFN frame and subframe number of the received message on the PRACH physical random access channel to a test instrument;
(3) and (3) the test instrument acquires the switching time delay in the switching process according to the SFN frame and the subframe number acquired in the step (2).
The step (1) further includes configuring, by the test instrument, the source cell and the target cell, where the configuring specifically includes:
the test instrument sets the parameters of the source cell and the target cell, so that the parameters of the source cell and the target cell meet the conditions for searching and accessing the terminal to be tested.
The step (2) is also preceded by the steps of:
and (2.0) the test instrument acquires the SFN interframe offset and the subframe offset of the source cell and the target cell at the same moment in an SFN query mode.
The step (2.0) is specifically as follows:
the method comprises the steps that a test instrument simultaneously sends an SNF query instruction to a source cell and a target cell, the source cell and the target cell receive the instruction, and report respective SFN frame numbers and subframe numbers at the moment when a next clock trigger signal of the instruction arrives according to the clock trigger signal, the SFN frame number of the source cell is SFN _ num1, the subframe number of the source cell is sub _ SFN _ num1, the SFN frame number of the target cell is SFN _ num2, and the subframe number of the target cell is sub _ SFN _ num2, the test instrument obtains SFN offset and subframe offset FN _ Soffset between the source cell and the target cell according to the SFN frame numbers and the subframe numbers of the source cell and the target cell, wherein the SFN offset is specifically as follows:
FN_SFN_offset＝SFN_num2－SFN_num1；
the sub-frame offset is as follows:
FN_sub_offset＝sub_sfn_num2－sub_sfn_num1；
the FN _ SFN _ offset is an inter-SFN offset between the source cell and the target cell, and the FN _ sub _ offset is an inter-subframe offset between the source cell and the target cell.
The step (2.0) is also preceded by the steps of:
(2.0.0) the terminal to be tested registers and accesses in the source cell, and acquires the parameters of the target cell through the broadcast message of the source cell; the test instrument configures the relevant parameters of the target cell to enable the target cell to meet the conditions for executing the switching process, and the terminal to be tested informs the network side that the target cell meets the conditions for executing the switching process.
The relevant parameters of the target cell configured by the test instrument specifically include:
the test instrument increases the power of the downlink common channel of the target cell to meet the condition of executing the switching process.
The handover message is an RRC Connection configuration message, and the step (2) is specifically:
the source cell sends an RRC Connection reconfiguration message to a terminal to be tested, and reports and sends an SFN frame number SFN _ num _ source of the RRC Connection reconfiguration message and a subframe number sub _ SFN _ source to a test instrument; the terminal to be tested configures air interface resources according to a switching message instruction, initiates an access process to the target cell, sends an MSG1 message to the target cell through a PRACH physical random access channel, and reports an SFN frame number SFN _ num _ target and a subframe number sub _ SFN _ target of the received MSG1 message to a test instrument by the target cell.
The clock trigger signal is a periodic trigger signal, and the period of the periodic trigger signal is 5 ms.
The source cell and the target cell are both TDD cells, and the test instrument in step (3) obtains the switching delay in the switching process according to the following formula:
Dhandover＝[SFN_num_target－SFN_num_source－(SFN_num2－SFN_num1)]×10+[sub_sfn_target－sub_sfn_source－(sub_sfn_num2－sub_sfn_num1)]×1；
wherein D ishandoverIs the switching time delay in the switching process, and DhandoverThe unit of (c) is ms.
In a specific embodiment, when the test instrument performs a handover test on a terminal to be tested of TD-LTE, first two TD-LTE cells, which are a source cell and a target cell, are established, and the two cells share a single clock of the test instrument, so that the two cells both have trigger signals with the same period of 5 ms. The SFN frame numbers of the air interfaces of the two cells start to be periodically accumulated and respectively counted when being respectively started and established, but the start time of the half frames in the two cells ensure synchronization through the same clock trigger signal.
The expression "implementing frame synchronization by using 5ms trigger signal" means implementing strict synchronization of system frame starting points of a source cell and a target cell in a test instrument by using a standard 5ms signal.
Referring to fig. 2, in the test instrument, the operations of establishing and deleting two cells 1 and 2 are triggered by the main control unit system of the test instrument through software instructions, the time established by each cell and the starting position of the air interface system frame start can only be determined according to the arrival and execution time of the instruction for establishing the simulated cell, the absolute time axis between cells cannot be guaranteed by the accurate time service of the GPS or the core network as in an actual system, and thus the time axis of the air interface frame reference between cells has a time offset, and the value of the offset cannot be measured and predicted at all.
Referring to fig. 3, in the present solution, each cell in the test instrument shares a 5ms trigger synchronization signal, and the time axis of the air interface of each cell is based on the clock trigger signal, and no matter how the instruction and the execution time established by each cell arrive, the start position of the air interface frame in the air interface of each cell is always aligned with the 5ms signal. Therefore, the time shaft of the air interface signal of each cell can be ensured to be at the position of the 5ms signal as the time starting point, and the time measurement error which is less than 5ms between systems is eliminated.
In addition, the 5ms trigger signal is adopted to realize frame synchronization, besides the consistency of the time axes of the system frames among different cells is ensured, the frame number difference of two cells at the same time point is obtained through an SFN query instruction before the switching action, and frame offset reference is provided for the subsequent estimation of the switching time through the frame number. The SFN frame number query process also ensures that the absolute time points of two cells for acquiring frame numbers are the same moment through the common trigger signal of 5 ms.
Therefore, in this embodiment, the main purpose of using the 5ms trigger signal is to provide a common time point reference for the source cell and the target cell in the handover process, which is different from the synchronization performed by the secondary synchronization signal SSS in the prior art, where the synchronization performed by the secondary synchronization signal SSS is to perform initial search on the cell by the terminal side to be detected, and the reselection and the neighboring cell measurement are means for performing fine cell synchronization when locking the resident cell or the neighboring cell.
In the above implementation, when the switching test case of the terminal to be tested is executed, the following procedure may be performed:
(1) a tester establishes a source cell and a target cell through a human-computer operation interface of a test instrument, and the two TD-LTE cells ensure synchronization in each 5ms half frame of an air interface through a clock trigger signal of the test instrument; parameters such as power, frequency and the like of the two cells need to be set in advance, so that the two cells can meet the conditions of searching and accessing of the terminal to be tested;
(2) when executing the test, the terminal to be tested is firstly started up in the source cell, completes the registration and access process in the source cell and enters a stable connection state; the terminal to be tested acquires information such as frequency, PCID and the like of the target cell through the broadcast message of the source cell;
(3) on the side of a tester, a tester increases the transmitting power of a downlink PDSCH channel through an instruction of a main control unit, improves the downlink common channel power of a target cell for switching test, triggers a terminal to be tested to measure the maximum power, and reports a measurement report to inform a network side that the target cell power meets the condition of executing a switching process;
(4) then, the main control unit of the test meter sends an SNF query instruction to the source cell and the target cell at the same time, after receiving the instruction, the two cells respectively report the SFN frame number and subframe number FN1(SFN _ num1, sub _ SFN _ num1) and FN2(SFN _ num2, sub _ SFN _ num2) at the time when the next 5ms trigger signal arrives, and the main control unit of the test meter records the frame number difference FN _ offset (SFN _ num 2-SFN _ num1, sub _ SFN _ num 2-sub _ SFN _ num1) between the cells;
(5) after the test instrument completes the configuration of the air interface resources of the source cell, the test instrument sends a switching message, namely an RRC Connection reconfiguration message, to the terminal to be tested on the source cell, and the source cell reports the SFN frame number and the subframe number of the message to be sent to a main control unit of the test instrument: FN _ s (SFN _ num _ source, sub _ SFN _ source);
(6) a terminal to be tested configures air interface resources according to a switching message instruction, initiates an Access process in a specified target cell, sends MSG1 on a PRACH (Physical Random Access Channel), executes uplink synchronization and subsequent resource configuration confirmation, completes a signaling flow for switching to the target cell, and maintains a connection state on the target cell; the target cell reports the SFN and subframe number FN _ t (SFN _ num _ target, sub _ SFN _ target) of the received MSG1 message to the test meter main control unit;
(7) and the main control unit of the test instrument calculates the time delay of switching.
The main idea of the switching time length calculation is as follows:
the switching time length is the time (frame number) when the terminal to be tested switches to the target cell, the time (frame number) when the terminal to be tested initiates switching from the source cell, and the reference frame number difference of the systems of the source cell and the target cell at the same time.
The main idea of calculating the switching time length not only calculates the frame number difference between the downlink switching message sent by the source cell and the MSG1 message received by the target cell, but also considers the frame number difference between the source cell and the target cell when the switching process is executed.
In this particular embodiment, the handover delay is calculated according to the following formula:
Dhandover＝[SFN_num_target－SFN_num_source－(SFN_num2－SFN_num1)]×10+[sub_sfn_target－sub_sfn_source－(sub_sfn_num2－sub_sfn_num1)]×1……(1)
the frame number at each instant is actually: (SFN, sub _ SFN), where the system frame number SFN is every 10ms plus 1, the sub _ SFN is every 1ms plus 1, one SFN contains 10 sub _ SFN (tdd), and each sub-frame is 1 ms. Therefore, in the formula in the cross-reference book, 10ms is used for calculating the SFN frame number difference, and 1ms is used for calculating the time difference caused by the frame number difference of sub _ SFN.
Please refer to fig. 1, which is a flowchart illustrating the above embodiment. When the source cell and the target cell are both TDD cells, 1 air interface frame is 10ms and comprises 10 subframes, and under the condition that each subframe is 1ms, the switching time D can be directly calculated by the formula (1)handover。
For the case that both the source cell and the target cell are FDD, the length of the system frame is the same as that of TDD, but the time length of the subframe is only half (0.5ms) of that of TDD, and one system frame includes 20 subframes, so in the above formula (1), the FDD subframe number needs to be converted into a time unit of 1ms by dividing by 2 and rounding. If the related source cell or the target cell is an FDD cell, the sub _ sfn reported by the physical layer is converted into the sub _ sfn 'by dividing the sub _ sfn by 2, and the converted sub _ sfn' can be used to substitute the formula, so that the time unit of 1ms is used for calculation through the formula (1).
The test instrument of the invention ensures the synchronization of the starting positions of the system frames between the source cell and the target cell by sharing the same clock (5ms trigger signal) for the two simulation cells, and obtains the direct frame number difference between the source cell and the target cell by sending SFN query instructions to the source cell and the target cell; and the test instrument calculates the time delay required by the terminal to be tested to execute the switching between the source cell and the target cell by acquiring the frame number difference of the switching instruction issuing time and the access initiating time of the terminal to be tested in the target cell and combining the frame number offset between the source cell and the target cell.
The method for realizing the detection control of the switching time of the mobile communication terminal device utilizes the synchronization characteristic between cells and the uniqueness of a system frame number SFN in the cells in a network environment constructed by a test instrument to detect the switching time of the terminal to be detected by counting the frame number, thereby avoiding the error caused by the instability of absolute time and the processing time delay of a system in the prior scheme. Compared with the scheme of absolute time difference adopted in the prior art, the method has great convenience. Under the scheme of the prior art, a user can only calculate time delay by measuring the arrival time point of a message, and cannot exclude the difference of transmission time from the notification of a physical layer to the arrival of the message at a main control unit of a test instrument, so that the execution efficiency of a bottom protocol stack and a high-level program of the test instrument can have great influence on the measurement of the time delay; in addition, if the absolute time difference is used to detect the switching delay, the test instrument cannot ensure the time reference synchronization between cells through the GPS clock reference and other methods, and errors may be generated in calculating the delay. The method for realizing the switching time detection control of the mobile communication terminal device does not need the support of a core network, is not limited by the cross-system of FDD and TDD-LTE base stations, and is simple and convenient. The method can effectively simplify the construction mode of the test environment, reduce the test cost, improve the precision and stability of the switching time delay measurement of the terminal to be tested, and simplify the difficulty of switching time detection.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims (9)

1. A method for realizing the switching time detection control of a mobile communication terminal device is characterized in that the method is based on a test instrument and comprises the following steps:
(1) the test instrument establishes two cells which are respectively a source cell and a target cell, and provides the same clock for the source cell and the target cell so that the source cell and the target cell have the same trigger signal;
(2) the source cell sends a switching message to a terminal to be tested and reports an SFN frame and a subframe number for sending the switching message to a test instrument; the target cell sends SFN frame and subframe number of the received message on the PRACH physical random access channel to a test instrument;
(3) and (3) the test instrument acquires the switching time delay in the switching process according to the SFN frame and the subframe number acquired in the step (2).
2. The method according to claim 1, wherein the step (1) further comprises configuring the source cell and the target cell by a test instrument, and the configuring specifically comprises:
the test instrument sets the parameters of the source cell and the target cell, so that the parameters of the source cell and the target cell meet the conditions for searching and accessing the terminal to be tested.
3. The method for realizing detection control of switching time of a mobile communication terminal device according to claim 1, wherein said step (2) is preceded by the steps of:
and (2.0) the test instrument acquires the SFN interframe offset and the subframe offset of the source cell and the target cell at the same moment in an SFN query mode.
4. The method for implementing detection control of switching time of mobile communication terminal device according to claim 3, wherein said step (2.0) is specifically:
the method comprises the steps that a test instrument simultaneously sends an SFN query instruction to a source cell and a target cell, the source cell and the target cell receive the instruction, and report respective SFN frame numbers and subframe numbers at the moment when a next clock trigger signal of the instruction arrives according to a clock trigger signal, the SFN frame number of the source cell is SFN _ num1, the subframe number of the source cell is sub _ SFN _ num1, the SFN frame number of the target cell is SFN _ num2, and the subframe number of the target cell is sub _ SFN _ num2, the test instrument obtains SFN interframe offset and the subframe offset FN _ sub _ offset between the source cell and the target cell according to the frame numbers and the subframe numbers of the source cell and the target cell, wherein the SFN interframe offset is specifically as follows:
FN_SFN_offset＝SFN_num2－SFN_num1；
the sub-frame offset is as follows:
FN_sub_offset＝sub_sfn_num2－sub_sfn_num1；
the FN _ SFN _ offset is an inter-SFN offset between the source cell and the target cell, and the FN _ sub _ offset is an inter-subframe offset between the source cell and the target cell.
5. The method for realizing detection control of switching time of a mobile communication terminal device according to claim 3, wherein said step (2.0) is preceded by the steps of:
(2.0.0) the terminal to be tested registers and accesses in the source cell, and acquires the parameters of the target cell through the broadcast message of the source cell; the test instrument configures the relevant parameters of the target cell to enable the target cell to meet the conditions for executing the switching process, and the terminal to be tested informs the network side that the target cell meets the conditions for executing the switching process.
6. The method according to claim 5, wherein the test meter configures the relevant parameters of the target cell as follows:
the test instrument increases the power of the downlink common channel of the target cell to meet the condition of executing the switching process.
7. The method for implementing detection and control of handover time of a mobile communication terminal device according to claim 4, wherein the handover message is an RRC Connection configuration message, and the step (2) is specifically as follows:
the source cell sends an RRC Connection reconfiguration message to a terminal to be tested, and reports and sends an SFN frame number SFN _ num _ source of the RRC Connection reconfiguration message and a subframe number sub _ SFN _ source to a test instrument;
the terminal to be tested configures air interface resources according to a switching message instruction, initiates an access process to the target cell, and sends an MSG1 message to the target cell through a PRACH physical random access channel, and the target cell reports an SFN frame number SFN _ num _ target and a subframe number sub _ SFN _ target of the received MSG1 message to a test instrument.
8. The method as claimed in claim 7, wherein the clock trigger signal is a periodic trigger signal, and the period of the periodic trigger signal is 5 ms.
9. The method according to claim 8, wherein the source cell and the target cell are both TDD cells, and the test instrument in step (3) obtains the handover delay in the handover procedure according to the following formula:
Dhandover＝[SFN_num_target－SFN_num_source－(SFN_num2－SFN_num1)]×10+
[sub_sfn_target－sub_sfn_source－(sub_sfn_num2－sub_sfn_num1)]×1；
wherein D ishandoverIs the switching time delay in the switching process, and DhandoverThe unit of (c) is ms.
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