WO2012065570A1

WO2012065570A1 - Implementation method, device, and terminal for calibration

Info

Publication number: WO2012065570A1
Application number: PCT/CN2011/082422
Authority: WO
Inventors: 刘伟
Original assignee: 意法⋅爱立信半导体（北京）有限公司
Priority date: 2010-11-19
Filing date: 2011-11-18
Publication date: 2012-05-24
Also published as: CN102025410B; CN102025410A

Abstract

Disclosed are an implementation method, a device, and a terminal for calibration. The method comprises: an instrument receiving an uplink burst signal transmitted by a terminal in an uplink time slot; the instrument confirming the physical address of the uplink time slot on the basis of the trigger address of the uplink burst signal, and confirming the physical address of a downlink time slot on the basis of the confirmed physical address of the uplink time slot and on the basis of a preset structure of a TD-SCDMA data frame; the instrument transmitting to the terminal a constant envelope signal on the basis of the confirmed physical address of the downlink time slot. In the present invention, the TD-SCDMA data frame is used for the transmission of signals between the terminal and the instrument, a need for downlink synchronization is obviated for a transmission-reception synchronous calibration between the terminal and the instrument, thereby allowing a rapid calibration of frequency and power between the terminal and the instrument. Thus the time required for calibration is shortened effectively, the complexity of the calibration process is lowered, the production efficiency is increased, and the production costs are reduced.

Description

Method and device for realizing calibration, and terminal

The present invention relates to the field of communications, and in particular, to a method and apparatus for implementing calibration, and a terminal. Background technique

With the Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), the terminal industry is maturing, the industry is

The large-scale production of TD-SCDMA terminals puts forward higher requirements. One of the important ones is to require the terminal to perform fast calibration and testing on the production line to ensure that the terminal can work normally after leaving the factory.

In the current calibration scheme, the terminal needs to perform downlink time-to-time comparison before calibration. This time-in-class process not only increases the complexity of the calibration process, but also increases the time-consuming calibration. When calibrating a large number of products, Will significantly extend the factory time of the end products of the entire product line, increase production costs.

In view of the complexity of the terminal calibration process and the long occupation time in the related art, an effective solution has not been proposed yet.

Summary of the invention

In view of the problems in the related art, the present invention proposes a method and apparatus for realizing calibration, and a terminal, which can eliminate the need for complicated synchronizing processes.

The technical solution of the present invention is implemented as follows:

In accordance with one aspect of the present invention, a method of implementing calibration is provided for performing calibration based on time division digital code division multiple access TD-SCDMA data frames.

The method for implementing the calibration according to the present invention includes: the meter receiving an uplink burst signal sent by the terminal in an uplink time slot; the meter determining an actual position of the uplink time slot according to the trigger position of the uplink burst signal, and determining the uplink according to the determined The actual location of the time slot and the predetermined structure of the TD-SCDMA data frame determine the actual location of the downlink time slot; the meter transmits a balance envelope signal to the terminal according to the determined actual location of the downlink time slot; The calibration result is obtained when the terminal performs signal mutual transmission.

The method may further include: the terminal receiving a balance envelope signal from the meter in a downlink time slot, wherein, in each downlink time slot, the time length of the terminal receiving the balance envelope signal is less than The length of time occupied by the downlink time slot, and the time interval for receiving the balance envelope signal is included in the range of the time interval occupied by the downlink time slot.

The terminal and the meter may perform signal transmission and reception according to a predetermined calibration scheme, where the calibration scheme includes: a distribution of uplink time slots and downlink time slots in a TD-SCDMA data frame, and each uplink The transmit power of the terminal corresponding to the time slot and the receive gain of the meter, the transmit power of the meter corresponding to each downlink time slot, and the receive gain of the terminal.

The method may further include at least one of the following: determining that the meter receives the receive gain of the uplink burst signal sent by the terminal in each uplink time slot, and saves the receive gain and the transmit power used by the terminal in the time slot. Corresponding relationship; determining that the terminal receives the receiving gain of the balance envelope signal sent by the meter in each downlink time slot, and saves the correspondence between the receiving gain and the transmitting power used by the meter in the time slot.

Wherein, in an uplink time slot, the terminal transmits the uplink burst signal with a constant power; in a downlink time slot, the meter transmits the down-envelope signal with a constant power.

In accordance with another aspect of the present invention, a calibration implementation apparatus is provided for performing calibration based on time division digital code division multiple access TD-SCDMA data frames.

The apparatus for implementing calibration according to the present invention includes: a receiving module, configured to receive an uplink burst signal sent by the terminal in an uplink time slot; and a determining module, configured to determine an actual location of the uplink time slot according to a trigger position of the uplink burst signal And determining, according to the determined actual location of the uplink time slot and the predetermined structure of the TD-SCDMA data frame, the actual location of the downlink time slot; the sending module, configured to send the balance envelope to the terminal according to the determined actual location of the downlink time slot a calibration module, configured to obtain a calibration result according to a situation in which the meter performs signal mutual transmission with the terminal.

Wherein, in a downlink time slot, the transmitting module transmits the lower envelope signal with a constant power.

According to still another aspect of the present invention, a terminal is provided, the terminal includes: a sending module, configured to send an uplink burst signal to an instrument in an uplink time slot of a TD-SCDMA data frame, where the The trigger position of the burst signal and the predetermined structure of the TD-SCDMA data frame determine the actual position of the downlink time slot; and the receiving module is configured to receive the balance envelope signal from the meter in the downlink time slot of the TD-SCDMA data frame.

The time length of the receiving module receiving the balance envelope signal in each downlink time slot may be The time interval that is less than the time slot occupied by the downlink time slot, and the time interval in which the balance envelope signal is received is included in the range of the time interval occupied by the downlink time slot.

In addition, in a downlink time slot, the transmitting module transmits the down-envelope signal with a constant power.

The invention realizes the signal transmission between the terminal and the instrument through the TD-SCDMA data frame, and the instrument determines the actual position of the uplink time slot and the downlink time slot according to the trigger position of the uplink signal, thereby realizing without the need of downlink peer processing. The same transmission and reception calibration between the terminal and the instrument helps to quickly carry out the calibration process of frequency and power between the terminal and the instrument, which can effectively shorten the calibration time, reduce the complexity of the calibration process, improve the production efficiency and save the production cost.

DRAWINGS

1 is a flow chart of a method of implementing calibration in accordance with an embodiment of the present invention;

2 is a schematic diagram of an implementation principle of a method for implementing calibration according to an embodiment of the present invention; FIG. 3 is a flowchart of a specific implementation manner of a method for implementing calibration according to an embodiment of the present invention; FIG. 4 is a calibration according to an embodiment of the present invention. Schematic diagram of the implementation of the method for transmitting and receiving signals in a specific subframe configuration;

Figure 5 is a block diagram of an apparatus for implementing calibration in accordance with an embodiment of the present invention;

6 is a block diagram of a terminal in accordance with an embodiment of the present invention.

detailed description

Specific embodiments of the present invention will be described in detail below with reference to the drawings.

Before the processing of the present invention is started, it is first necessary to configure the TD-SCDMA frame structure and the format of the signal used in the calibration process, and specify the uplink time slot (terminal transmission, and the time slot received by the meter) and the downlink time slot (terminal). The location of the time slot received and received by the meter is notified to the terminal and the meter. The above-mentioned uplink and downlink time slot ratios can be flexibly configured according to actual needs. The specific allocation can be determined according to the resources occupied by the uplink and downlink calibrations. The calibration process in accordance with an embodiment of the invention can then begin to be performed.

As shown in FIG. 1, a method for implementing calibration according to an embodiment of the present invention includes:

Step S101, the meter receives an uplink burst signal (burst signal) sent by the terminal in an uplink time slot; and in step S103, the meter determines an actual position of the uplink time slot according to the trigger position of the uplink burst signal, and according to the determined uplink time slot. The actual location and the predetermined structure of the TD-SCDMA data frame determine the actual location of the downlink time slot;

Step S105: The meter sends a balance envelope signal to the terminal according to the determined actual location of the downlink time slot (for example, it may be a single tone signal, etc., and is not enumerated herein);

Step S107: The calibration result is obtained according to the situation in which the meter and the terminal perform signal mutual transmission (including transmission condition and reception condition).

By means of the above processing, the signal transmission between the terminal and the meter is realized by the TD-SCDMA data frame, and the actual position of the uplink time slot and the downlink time slot is determined by the meter according to the trigger position of the uplink signal, thereby eliminating the need for downlink simultaneous processing. Under the circumstance, the calibration of the transceiver between the terminal and the instrument is realized, which helps to quickly carry out the calibration process of frequency and power between the terminal and the instrument, which can effectively shorten the calibration time, reduce the complexity of the calibration process, improve the production efficiency and save. Cost of production.

Considering the real system, due to factors such as system delay and measurement error, the transmission time of the downlink signal calculated by the meter does not completely match the true terminal reception time slot. For example, it may be reflected in the following two cases:

(Case 1): The uplink transmission time of the terminal and the downlink transmission time of the instrument partially overlap, which affects the uplink signal measurement. This situation may occur in a scenario where the transmission and reception time slots are closely connected. For example, the calibration process makes full use of the data. All 7 time slots in the frame, and the upstream time slot is adjacent to the downlink time slot (for example, the meter is in the transmitting state in the third time slot, the meter is in the receiving state in the fourth time slot), between the two time slots Only 12.5us time interval;

(Case 2) During the partial time period in the terminal receiving time slot, the downlink balance envelope signal of the instrument is not transmitted, and the data received by the terminal is actually noise floor.

In response to the above problem, when the terminal receives the balance envelope signal from the meter, in each downlink time slot, the time length of the terminal receiving the balance envelope signal is less than the length of time occupied by the downlink time slot, and the balance envelope signal is received. The time interval is included in the range of the time interval occupied by the downlink time slot.

Specifically, assume that the duration of one downlink time slot is T1 to T2 (TKT2), in which the time slot is The time period during which the inner terminal actually receives the downlink balance envelope signal may be T3 to T4, where ΤΚΤ3<Τ4<Τ2 (may also be Τ1≤Τ3<Τ4<Τ2 or Τ1<Τ3<Τ4≤Τ2).

For example, for each downstream time slot, the meter can transmit a tone signal at a full time slot of 848 chip times (662.5 US), while the terminal only receives a portion of the signal in the middle of the time slot. Since the downlink tone is a balanced envelope signal, an effective calibration measurement (e.g., power measurement) is guaranteed as long as the terminal can receive a portion of the continuous tone signal within the agreed reception time window. Through the adjustment of the receiving time of the above terminal, the redundancy of the time can be provided, and even if there is a large time deviation between the meter and the terminal, the terminal can correctly receive the balance envelope signal, thereby avoiding the above situation. The problem of calibration failure.

As shown in Figure 2, in a TD-SCDMA sub-frame, the meter will first trigger the downlink signal time point according to the burst signal, and the terminal only receives the downlink signal for a period of time in the downlink time slot.

Optionally, the calculation of each downlink time slot (including uplink and downlink) by the meter may only depend on the trigger time of the uplink data of the current frame, so the time error in each subframe does not accumulate to subsequent subframes, such that The influence of multi-frame time error accumulation on the transmission and reception timing is avoided.

The solution of this embodiment can implement calibration of the power point and the receiving gain. In addition, in addition to pre-configuring the distribution of the uplink time slot and the downlink time slot in the TD-SCDMA data frame, it is also required to configure the terminal in each uplink. The transmit power of the slot and the corresponding receive gain of the meter, and the downlink tone signal required by the terminal are set on the instrument side, and the transmit power of each downlink time slot of the meter and the corresponding receive gain of the terminal are preset. Wherein, in an uplink time slot, the terminal transmits the uplink burst signal with a constant power; and in a downlink time slot, the meter transmits the down-envelope signal with a constant power.

By measuring a limited number of uplink or downlink power points (the uplink signal is the meter measurement and the downlink signal is the terminal measurement), it is possible to obtain all the power point settings of the uplink/downlink signal within the required dynamic range, and calculate the given transmission power. And the reception of signals (for example, signal strength, etc.) under given reception gain conditions.

In practical applications, after the calibration starts, no additional peer process is required, and the terminal repeats the similar operation from the first subframe, that is, a TD-specific pre-configured power is sent to the meter in the transmission slot in one subframe. SCDMA uplink Burst calibration signal, then open reception in each receiving time slot The machine, according to the preset, receives the downlink tone calibration signal of the specific power sent by the meter. The instrument performs the corresponding operation, SP, first in the receiving state, receives the signal sent by the terminal, finds the position of the uplink time slot according to the trigger of the uplink Burst signal, receives the uplink calibration data, and the instrument needs to be pre-configured according to the time slot structure and The trigger position of the uplink signal, the meter calculates the approximate receiving time interval of the terminal, and sends a corresponding downlink tone signal to the terminal for receiving by the terminal. It should be emphasized that the power configuration in one complete time slot is constant regardless of uplink or downlink, and the power configuration between different time slots can be changed as required.

In the above calibration process provided by the embodiment, in each TD-SCDMA subframe, the terminal and the meter can cooperate with each other according to the preset settings, complete the transmission and reception of the corresponding calibration signal, complete the transmission and reception calibration, and ensure one sub-frame. Most of the time in the frame is used for calibration, and the effect of the calibration is improved. The calibration process according to the embodiment of the present invention will be described below with reference to specific examples. As shown in FIG. 3, the following steps are specifically included.

Step 1. Write the uplink/downlink time slot and the power configuration to the terminal and the meter respectively. The premise of the fast transmission and reception calibration between the TD-SCDMA terminal and the calibration test instrument is that the terminal and the signal configuration of the instrument remain corresponding, that is, the transmission time slot of the terminal corresponds to the receiving time slot of the instrument and the transmission signal matches the reception gain, and the transmission of the instrument The time slot corresponds to the receiving time slot of the terminal and the transmitting time slot matches the receiving gain. Therefore, before calibration, it is necessary to set the size of the uplink signal required by the instrument and the time of receiving the signal according to the specific configuration of the signal frame structure, and The terminal sets the size of the downlink signal required by the terminal and the gain of each receiving slot. The above configuration process can generally be completed by controlling the terminal and the meter by a control device such as a computer.

The specific time slot configuration used in this example is as follows: The TS1, TS2, TS3, TS4, TS5 time slots in one subframe are used as uplink signal calibration, §Ρ, in TS1 to TS5, the terminal transmits a burst signal, the meter Receiving this signal; and using TS6 and TS0 as the downlink signal calibration, §Ρ, at the approximate time points of TS6 and TS0, the meter will transmit the balance envelope signal (for example, it can transmit a single tone signal with an offset carrier frequency of 64KHz). The terminal receives this signal as shown in Figure 4. In this configuration, the transceiver calibration can take advantage of most of the time slots in a single subframe.

In this embodiment, a total of 15 different power points need to be calibrated in the uplink, and 12 different power points are calibrated in the downlink. Taking into account the need to ensure the accuracy of the measurement during the calibration process, the measurement of all power points up and down Values can be measured multiple times and then averaged. According to the above situation, the following specific configuration is adopted. One power point of the uplink power measures the burst signal power of five complete time slots, and averages the measured value; and each measurement of one power point of the downlink power intercepts data of 384 chip lengths. A total of two such length measurements are taken, and then an average is calculated to calculate a downlink power value. According to the above setting, it can be calculated that a total of 15 subframes are required for the transceiver fast calibration, wherein five uplink time slots of each subframe calibrate one uplink power point, and two downlink time slots calibrate one downlink power point. The downlink time slots of the last three subframes may be idle or may be utilized. For example, considering that the downlink calibration has a slightly larger statistical error at the input low power, more samples can be taken at low power to improve the accuracy, thereby utilizing the downlink time slots in the last three subframes, specifically, the downlink The minimum of the 12 power points of the 12 power points, 4 times 384 chip length measurements, the total time required for transceiver calibration is 75ms.

Step 2: After the terminal and the meter are connected and the calibration is started, the terminal transmits a burst signal, and the meter receives the signal, and the uplink signal is triggered by the power signal trigger, and the downlink signal time is calculated.

Specifically, the terminal sends an uplink Burst signal to the calibration meter in five time slots within a predetermined one subframe according to a pre-configuration. The calibration instrument receives the signal according to the received power configured in advance, and uses the existing power trigger function of the meter to automatically find the uplink Burst signal and simultaneously with the other external trigger, and simultaneously collect the power signals of each uplink time slot. Measured in power. Based on the pre-configuration, the meter estimates the approximate time of the downstream signal. As shown in Figure 4, in this example, the downlink time is 5 times delayed from the first burst trigger time, that is, 5x675us=3375us. In order to ensure sufficient transmission and reception intervals, the time for the meter to transmit a tone signal can be appropriately delayed based on the above delay, for example, by 16 chips, which is 12.5us. To sum up, from the trigger time of the uplink burst to the transmission of the downlink tone signal, a total delay of 3387.5us is required.

Step 3: The meter transmits the downlink tone signal according to the estimated time; the terminal receives the signal within the specified time window.

In this step, the meter transmits a single tone signal deviating from the center frequency point by 64 kHz according to the calculated time delay according to the TD-SCDMA time slot structure. At this point, the terminal has completed the transmission of 5 uplink time slots, and is ready to receive the tone signals of the time slots TS6 and TS0. Although the tone signal transmitted by the meter will continue for the entire receiving time slot, the terminal can only receive 300us (384 bits) in the middle of the entire time slot (848 chip length). Chip length). Therefore, the front part of the receive time slot will have a redundancy time of 181.25 US (232 chips), and the latter part will also have a redundancy time of 181.25 us (232 chips). These redundant times make the system extremely lenient for the downlink time. Even if the instrument transmits data and the terminal has a time deviation of nearly 160us before and after the terminal is received, the terminal can receive the monophonic data of the required duration normally, thus ensuring the calibration. Reliability.

Step 4: Repeat the above process in different sub-frames until all the power points are calibrated, and the transceiver calibration table generated by the calibration data is stored in the terminal, and the receiving transmission calibration is all ended.

The invention provides a fast calibration method for the TD-SCDMA terminal receiving and dispatching without the downlink time and the same, which omits the process of the downlink downlink peer in the calibration, and significantly shortens the receiving and transmitting calibration time of the terminal, and realizes the large-scale TD-SCDMA terminal. Quick calibration on the production line lays a good foundation.

Wherein, when the calibration result is obtained, a plurality of calibration algorithms such as fitting can be used, and how to select the calibration algorithm is well known to those skilled in the art, and will not be described in detail herein.

In accordance with an embodiment of the present invention, there is also provided a calibration implementation apparatus for performing calibration based on a time division digital code division multiple access TD-SCDMA data frame.

As shown in FIG. 5, the apparatus for implementing calibration according to an embodiment of the present invention includes:

The receiving module 51 is configured to receive an uplink burst signal sent by the terminal in an uplink time slot;

The determining module 52 is connected to the receiving module 51, configured to determine an actual position of the uplink time slot according to the trigger position of the uplink burst signal, and determine the downlink time according to the determined actual position of the uplink time slot and the predetermined structure of the TD-SCDMA data frame. The actual position of the gap;

The sending module 53 is connected to the determining module 52, configured to send a balance envelope signal to the terminal according to the determined actual location of the downlink time slot;

The calibration module 54, which is connected to the receiving module 51 and the transmitting module 53, is used to obtain a calibration result according to the situation in which the meter and the terminal perform signal mutual transmission.

Wherein, in a downlink time slot, the transmitting module 53 transmits the down-envelope signal with a constant power.

According to an embodiment of the present invention, a terminal is also provided.

As shown in FIG. 6, a terminal according to an embodiment of the present invention includes:

The sending module 61 is configured to send an uplink burst signal to the meter in an uplink time slot of the TD-SCDMA data frame, to provide a trigger position of the uplink burst signal according to the trigger position of the uplink burst signal and the TD-SCDMA data frame. The fixed structure determines the actual location of the downlink time slot;

The receiving module 62 is configured to receive the balance envelope signal from the meter in a downlink time slot of the TD-SCDMA data frame.

In each downlink time slot, the time length of the receiving envelope 62 receiving the balance envelope signal is less than the length of time occupied by the downlink time slot, and the time interval of receiving the balance envelope signal is included in the downlink time slot. Within the range of time intervals.

And, in a downlink time slot, the transmitting module 61 transmits the down-envelope signal with a constant power.

Preferably, the calibration module 54 of FIG. 5 can also be connected to the transmitting module 61 and the receiving module 62 in the terminal shown in FIG. 6, thereby integrating the mutual measurement of the meter and the terminal to obtain a calibration result.

The apparatus and terminal shown in FIG. 5 and FIG. 6 can also perform the processing described in the previous method embodiment. The specific processing is not repeated here, and the description of the corresponding part in the method can be referred to.

In summary, with the above technical solution of the present invention, signal transmission between the terminal and the meter is realized by the TD-SCDMA data frame, and the actual position of the uplink time slot and the downlink time slot is determined by the meter according to the trigger position of the uplink signal. Therefore, the simultaneous calibration of the transceiver between the terminal and the instrument can be realized without the need of downlink simultaneous processing, which facilitates the rapid calibration process of frequency and power between the terminal and the instrument, can effectively shorten the calibration time, and reduce the calibration process. The complexity, increase production efficiency and save production cost; In addition, by reducing the terminal receiving time period to within the downlink time slot range, the terminal and instrumentation requirements can be effectively reduced, and the reliability and accuracy of the calibration process can be improved.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Claims

Claim

A calibration implementation method for performing calibration based on a time-division code-division-multi-access TD-SCDMA data frame, wherein the implementation method includes:

The meter receives an uplink burst signal sent by the terminal in an uplink time slot;

The meter determines an actual location of the uplink time slot according to the trigger position of the uplink burst signal, and determines an actual location of the downlink time slot according to the determined actual location of the uplink time slot and a predetermined structure of the TD-SCDMA data frame;

The meter sends a balance envelope signal to the terminal according to the determined actual location of the downlink time slot; and obtains a calibration result according to the situation in which the meter performs signal mutual transmission with the terminal.

2. The implementation method according to claim 1, further comprising:

Receiving, by the terminal, a balance envelope signal from the meter in a downlink time slot, wherein, in each downlink time slot, a time length of the terminal receiving the balance envelope signal is less than a length of time occupied by the downlink time slot And the time interval in which the balance envelope signal is received is included in the range of the time interval occupied by the downlink time slot.

The implementation method according to claim 1, wherein the terminal and the meter perform signal transmission and reception according to a predetermined calibration scheme, where the calibration scheme comprises: uplinking in a TD-SCDMA data frame The distribution of time slots and downlink time slots, the transmission power of the terminal corresponding to each uplink time slot and the receiving gain of the meter, the transmission power of the meter corresponding to each downlink time slot, and the receiving gain of the terminal.

4. The method according to claim 3, wherein the method further comprises at least one of the following:

Determining, by the meter, the receiving gain of the uplink burst signal sent by the terminal in each uplink time slot, and storing the correspondence between the receiving gain and the transmitting power used by the terminal in the time slot;

It is determined that the terminal receives the receiving gain of the balance envelope signal sent by the meter in each downlink time slot, and saves the correspondence between the receiving gain and the transmitting power used by the meter in the time slot.

The implementation method according to claim 1, wherein in an uplink time slot, the terminal transmits an uplink burst signal with a constant power; and in a downlink time slot, the meter uses a constant power. Send the lower envelope signal.

A calibration implementation device for performing calibration based on a time-division code-division-multi-access TD-SCDMA data frame, wherein the implementation device comprises:

a receiving module, configured to receive an uplink burst signal sent by the terminal in an uplink time slot;

a determining module, configured to determine an actual location of the uplink time slot according to the trigger position of the uplink burst signal, and determine an actual location of the downlink time slot according to the determined actual location of the uplink time slot and a predetermined structure of the TD-SCDMA data frame;

a sending module, configured to send a balance envelope signal to the terminal according to the determined actual location of the downlink time slot;

And a calibration module, configured to obtain a calibration result according to a situation in which the meter performs signal mutual transmission with the terminal.

The implementation device according to claim 6, wherein in a downlink time slot, the transmitting module transmits the lower envelope signal with a constant power.

8. A terminal, comprising:

a sending module, configured to send an uplink burst signal to the meter in an uplink time slot of the TD-SCDMA data frame, where the meter determines the downlink time according to the trigger position of the uplink burst signal and a predetermined structure of the TD-SCDMA data frame The actual position of the gap;

And a receiving module, configured to receive a balance envelope signal from the meter in a downlink time slot of the TD-SCDMA data frame.

The terminal according to claim 8, wherein, in each downlink time slot, the time length of the receiving module receiving the balance envelope signal is less than the length of time occupied by the downlink time slot, and receiving the balance packet The time interval of the network signal is included in the range of the time interval occupied by the downlink time slot.

10. The terminal according to claim 8, wherein in a downlink time slot, the transmitting module transmits the lower envelope signal with a constant power.