CN116389940A - Remote water meter reading method based on eDRX communication technology - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
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- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/60—Arrangements in telecontrol or telemetry systems for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter
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- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/70—Arrangements in the main station, i.e. central controller
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- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/80—Arrangements in the sub-station, i.e. sensing device
- H04Q2209/82—Arrangements in the sub-station, i.e. sensing device where the sensing device takes the initiative of sending data
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Abstract
The invention belongs to the technical field of intelligent remote water meters, and particularly relates to a remote water meter reading method based on an eDRX communication technology, wherein discontinuous reception of UE (user equipment) in an RRC_CONNECTED state is completed jointly through a set of timers, and the method comprises the following specific steps of: s1, RRC configures eDRX parameters, and UE calculates a subframe for starting OnDuationTimer-r 13 through a formula; s2, judging whether the HARQ RTTTimer is overtime and whether the decoding of the data in the HARQ cache data is successful or not; if not, starting the DrxRecranspossessionTimer-r 13 of the HARQ Process, and retransmitting data; s3, judging whether a new NPDCCH is received in the On duration timer-r13; if yes, starting the HARQRTT Timer; if not, continuously monitoring NPDCCH until OnDuationTimer-r 13 is overtime; s4, when the HARQRTTimer is overtime, starting a Drx-InactivityTimer-r13, and judging whether the UE receives a scheduling instruction or not; if yes, stopping OnDuationTimer-r 13 and Drx-InactivityTimer-r13; if not, the Drx-InactivityTimer-r13 is started and restarted.
Description
Technical Field
The invention belongs to the technical field of intelligent remote water meters, and particularly relates to a remote water meter reading method based on an eDRX communication technology.
Background
In recent years, NB-IoT has become the mainstream communication technology of intelligent remote water meters, and most manufacturers use MCU+NB-IoT standard modules. The NB-IoT standard module adopts a PSM mode or a power-off mode, is in a dormant or power-off state at ordinary times, cannot receive instructions sent by the master station platform system, and can be awakened into a working state by the MCU only at a timing reporting time or a manual triggering time, and can send instructions to be executed pre-stored by the master station platform system after reporting to the master station platform system is completed.
The communication initiator in the prior art can only be a water meter, and the instruction of the main station platform system is prestored firstly, and then the prestored instruction can be issued and executed after the water meter reports. Therefore, the instruction to be issued by the master station platform system does not have real-time performance and bi-directionality. In some situations where the instruction needs to be issued in real time, for example, payment is opened, or the user must wait until the next time when the water meter is reported, or the user must find the water meter and execute the triggering action on the water meter, the use experience of the user is poor. In addition, if the NB-IoT standard module uses the power-off mode, the network needs to be reattached before each time the water meter reports, and the entire communication handshake process is completed to start reporting. On the one hand, the reporting time is long, the number is less than 10 seconds, the number is more than 60 seconds, and the reporting power consumption is high, and on the other hand, because the reporting time is long, the conflict and the collision of the reporting of different water meters are easy to occur, and the reporting is failed.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a remote meter reading method of a water meter based on an eDRX communication technology, which aims to solve the problems of real-time and bidirectional communication of an intelligent remote water meter, shorten reporting time, save power consumption in the reporting process and improve reporting success rate.
In order to achieve the above object, the present invention provides the following technical solutions:
the remote meter reading method of the water meter based on the eDRX communication technology is characterized in that the eDRX works in two modes of RRC_IDLE and RRC_CONNECTED; when the UE is in an RRC_IDLE state, the UE periodically monitors a broadcast channel and a call channel, and discontinuously receives a message from the eNodeB at a specific moment; when the UE needs to receive service data, the UE jumps to an RRC_CONNECTED state from an RRC_IDLE state; discontinuous reception of the UE in the RRC_CONNECTED state is completed through a set of timers, wherein the timers comprise On Duration Timer-r13, drx-StartOffset-r13 and Drx-InactivityTimer-r13, and the specific steps comprise:
s1, RRC configures eDRX parameters, and UE calculates a subframe of On duration timer-r13 through a formula;
s2, judging whether the HARQ RTT Timer is overtime and whether data decoding in the HARQ cache data is successful or not; if yes, further judging whether a new NPDCCH is received in the On duration timer-r13; if not, starting Drx RetransmissionTimer-r13 of the HARQ Process and retransmitting data;
s3, judging whether a new NPDCCH is received in the On duration timer-r13; if yes, starting the HARQ RTT Timer; if not, continuously monitoring NPDCCH until the On duration timer-r13 is overtime;
s4, when the HARQ RTT Timer is overtime, starting the Drx-InactivityTimer-r13, and judging whether the UE receives a scheduling instruction or not; if yes, stopping the On duration timer-r13 and the Drx-Inactivitytimer-r13; if not, the Drx-InactivityTimer-r13 is started and restarted.
Preferably, the timer On Duration Timer-r13 represents the on-line duration of the UE after sleep in one eDRX cycle, and has the following values: pp1, pp2, pp3, pp4, pp8, pp16, pp32.
Preferably, the timer Drx-StartOffset-r13 is used for designating a pointer for starting the On duration timer-r13, and the value of the pointer is 0-255.
Preferably, the Timer HARQ RTT Timer represents the minimum number of subframes that the UE needs to wait before receiving downlink retransmission data; when the received PDCCH subframe shows downlink transmission or is in a DL-SPS subframe, a Timer HARQ RTT Timer is started, and meanwhile, the Drx-retransmission Time-r13 stops.
Preferably, the Timer Drx-incavitytimer-r 13 is started after the specified HARQ RTT Timer times out, and continuously monitors the NPDCCH subframe during the operation period, and takes the following values: pp0, pp1, pp2, pp3, pp4, pp8, pp16, pp32, the basic timing unit of which is the number of NPDCCH subframes.
Preferably, the Timer Drx-retransmission Timer-r13 specifies that after the HARQ RTT Timer expires, data in the corresponding HARQ Process is repeatedly transmitted in its continuous time, where the value is as follows: pp0, pp1, pp2, pp4, pp6, pp8, pp16, pp24, pp33.
Preferably, in eDRX, the basic units of On Duration Timer-r13, drx-InactyityTimer-r 13 and Drx-RecransposionTimer-r 13 timers are changed from original subframes to pp, and the length of pp is a dynamically variable unit.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the remote meter reading method of the water meter based on the eDRX communication technology, the eDRX communication technology is used for solving the problems of instantaneity and bidirectionality of NB-IoT intelligent remote water meter communication, and the instruction to be issued by the master station platform system can be issued at any time, and can reach the water meter and be executed after waiting for one eDRX period at most.
(2) The remote meter reading method of the water meter based on the eDRX communication technology reduces the interaction process between the water meter and the base station, and greatly shortens the reporting time, thereby greatly saving the power consumption of the reporting process, reducing the reporting conflict and improving the reporting success rate.
Drawings
FIG. 1 is an algorithm flow diagram of the eDRX mechanism in the RRC_CONNECTED state;
FIG. 2 is an eDRX operation mechanism diagram in the RRC_CONNECTED state;
FIG. 3 is a functional mechanical drawing of a PSM;
FIG. 4 is a functional mechanical diagram of DRX;
FIG. 5 is a functional mechanical diagram of eDRX;
Detailed Description
The following description of the embodiments of the present invention will be apparent from the description of the embodiments of the present invention, which is provided in part, but not in whole. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Referring to fig. 1-2, the remote meter reading method of the water meter based on the eDRX communication technology is characterized in that the eDRX works in two modes of rrc_idle and rrc_connected; when the UE is in an RRC_IDLE state, the UE periodically monitors a broadcast channel and a call channel, and discontinuously receives a message from the eNodeB at a specific moment; when the UE needs to receive service data, the UE jumps to an RRC_CONNECTED state from an RRC_IDLE state; discontinuous reception of the UE in the RRC_CONNECTED state is completed through a set of timers, wherein the timers comprise On Duration Timer-r13, drx-StartOffset-r13 and Drx-InactivityTimer-r13, and the specific steps comprise:
s1, RRC configures eDRX parameters, and UE calculates a subframe of On duration timer-r13 through a formula;
s2, judging whether the HARQ RTT Timer is overtime and whether data decoding in the HARQ cache data is successful or not; if yes, further judging whether a new NPDCCH is received in the On duration timer-r13; if not, starting Drx RetransmissionTimer-r13 of the HARQ Process and retransmitting data;
s3, judging whether a new NPDCCH is received in the On duration timer-r13; if yes, starting the HARQ RTT Timer; if not, continuously monitoring NPDCCH until the On duration timer-r13 is overtime;
s4, when the HARQ RTT Timer is overtime, starting the Drx-InactivityTimer-r13, and judging whether the UE receives a scheduling instruction or not; if yes, stopping the On duration timer-r13 and the Drx-Inactivitytimer-r13; if not, the Drx-InactivityTimer-r13 is started and restarted.
In this embodiment, the timer On duration timer-r13 represents the On-line duration after the UE sleeps in one eDRX cycle, and the values are: pp1, pp2, pp3, pp4, pp8, pp16, pp32. The timer Drx-StartOffset-r13 is used for designating the pointer for starting the On duration timer-r13, and the value of the pointer is 0-255. The HARQ RTT Timer represents the minimum number of subframes which need to be waited before the UE receives the downlink retransmission data; when the received PDCCH subframe shows downlink transmission or is in a DL-SPS subframe, a Timer HARQ RTT Timer is started, and meanwhile, the Drx-retransmission Time-r13 stops. The Timer Drx-InactivityTimer-r13 is started after the HARQ RTT Timer is appointed to be overtime, and continuously monitors the NPDCCH subframe during the operation, and the value is as follows: pp0, pp1, pp2, pp3, pp4, pp8, pp16, pp32, the basic timing unit of which is the number of NPDCCH subframes. After the Timer Drx-retransmission Timer-r13 designates that the HARQ RTT Timer times out, the data in the corresponding HARQ Process is repeatedly transmitted in the continuous time, and the value of the data is as follows: pp0, pp1, pp2, pp4, pp6, pp8, pp16, pp24, pp33. In eDRX, the basic units of On Duration Timer-r13, drx-InactivityTimer-r13 and Drx-retransmission Timer-r13 timers are changed from original subframes to pp, and the length of pp is a dynamically variable unit.
Working principle: NB-IoT supports the following three power saving modes: 1. PSM (Power Saving Mode) the terminal is not in deep sleep during non-business period, does not receive downlink Data, can receive the downlink Data prestored by the master station platform system only when the terminal actively transmits uplink Data (MO Data), and is suitable for business without delay requirement on the downlink Data; the terminal equipment has low power consumption and adopts a battery power supply mode; 2. DRX (Discontinuous Reception) it can be considered that the downlink service can reach the terminal equipment at any time, and the terminal can detect whether downlink service arrives once in every DRX cycle (basically 2.56s in NB-IoT system), which is suitable for the service with high requirement on time delay, and the terminal equipment generally adopts the mode of mains supply; 3. eDRX (Extended DRX) the terminal device gives consideration to low power consumption and services with certain requirements on time delay, in each eDRX cycle, the terminal can receive downlink data only in a set Paging Transmission Window (PTW), and the rest of the terminals are in a dormant state and do not receive downlink data.
Aiming at the NB-IoT intelligent remote water meter, meter reading service has the characteristics of low speed and low frequency, the water meter is required to have extremely low power consumption, and meanwhile, partial service, such as remote control valve service, is required to have smaller time delay. Therefore, it is necessary to introduce eDRX communication technology to cope with the traffic characteristics thereof.
eDRX, like DRX, can operate in both rrc_ IDLE (Radio Resource Control Idle) and rrc_ CONNECTED (Radio Resource Control Connected) modes. When the UE is in rrc_idle state, it does not receive traffic data and has no RRC connection, so the UE will only listen on the broadcast channel and the call channel. However, this listening is periodic, and messages from the eNodeB are received discontinuously at specific times, thus achieving the goal of saving battery consumption. When the UE needs to receive traffic data, it will jump from rrc_idle state to rrc_connected state, where discontinuous reception is done together by a set of timers, including:
on duration timer-r13: the timer represents the on-line time length after the UE sleeps in one eDRX period, and has the following values: pp1, pp2, pp3, pp4, pp8, pp16, pp32.
Drx-StartOffset-r13: the pointer is pointed to turn on OnDurationTimer-r13, and the value is 0-255 (rounded).
HARQ RTT Timer: the minimum number of subframes that the UE needs to wait before receiving the downlink retransmission data is indicated, and when the received PDCCH subframe shows downlink transmission or is in DL-SPS subframe, the timer is started, and meanwhile Drx-retransmission time-r13 will stop.
Drx-InactivityTimer-r13: after the time-out of the appointed HARQ RTT Timer, the method is started, and continuously monitors the NPDCCH subframe during the operation period, wherein the value of the NPDCCH subframe is as follows: pp0, pp1, pp2, pp3, pp4, pp8, pp16, pp32, its basic timing unit is the number of NPDCCH subframes.
Drx-retransmission timer-r13: after the HARQ RTTTimer is overtime, the data in the corresponding HARQ Process is repeatedly transmitted in the continuous time, and the value is as follows: pp0, pp1, pp2, pp4, pp6, pp8, pp16, pp24, pp33.
In eDRX, the basic units of On Duration Timer-r13, drx-InactivityTimer-r13 and Drx-retransmission Timer-r13 are changed from original subframes to pp (PDCCH period), because pp is a dynamically variable unit in length, which enables the UE to adapt to the service characteristics of the narrowband Internet of things more.
When the eDRX mechanism is in idle mode, eDRX under NB-IoT system inherits the DRX functionality mechanism in LTE. Due to the infrequent, energy efficient requirements of NB-IoT terminal traffic, support for enhanced coverage, DRX cycles in rrc_idle state are extended and superframes (Hyper-frames) are also introduced in NB-IoT systems. The functional mechanism is as follows: the UE negotiates with the MME to obtain the specific eDRX of the UE, and then obtains the super frame number (Hyper-SFN) of the Paging message through the calculation of the Paging super frame (PH), and then obtains the possible SFN area range of the Paging message of the UE through the calculation of the Paging transmission window (Paging Transimission Window, PTW); finally, the subframe where the Paging message is located is obtained through Paging Frame (PF) and Paging time (PO).
The 10bit Hyper-SFN carried by the system messages is used in NB-IoT to extend the DRX period (TDRX), which consists of 1024 SFNs. The terminal monitors the control channel for paging during the PTW on the designated Hyper-SFN and monitors the paging during the PTW according to the normal DRX cycle (TDRX), i.e. one PO in the PF listens to NPDCCH (Narrowband Physical Downlink Control Channel) scrambled by the P-RNTI.
The relevant parameters of the paging process are calculated as follows:
(1) Paging Superframes (PFs) are calculated to satisfy the paging superframe number (Hyper-SFN):
(Hyper-SFN)mod TeDRX,H＝UEID modTeDRX,H
where the UEID takes the value IMSI mod 1024, terx, h is eDRX period (may take the value 2,3, …,1024 Hyper-frames).
(2) Calculation of Paging Transmission Window (PTW):
the calculation of the paging transmission window start position (PTWstar) needs to satisfy:
SFN＝256×ieDRX
ieDRX＝floor(UEID/TeDRX,H)/mod4
wherein floor is rounded downwards;
the calculation of the paging transmission window termination position (PTWend) needs to satisfy:
SFN＝(PTWstar+L×100–1)mod 1024
where L is the paging transmission window length (unit: s), configured by the higher layers.
(3) Calculation of Paging Frames (PF)
SFN mod T＝(T div N)×(UEID modN)
Where div is the integer division operation.
(4) Calculation of Paging Occasions (PO)
i_s＝floor(UEID/N)modNs
Where Ns represents the number of POs contained within each PF.
When the eDRX mechanism is in a connected state, in the LTE system, the service transmission characteristics of the eDRX mechanism are met by configuring a Long DRX Cycle and a Short DRX Cycle; for NB-IoT systems with low traffic frequency and low rate, the Short DRX Cycle is cancelled, and the Long DRX Cycle is named as DRX-Cycle-R13, in order to cope with the longer transmission interval of NB-IoT traffic data, the maximum value domain of the Long DRX Cycle is extended from 2560 subframes to 9216 subframes of R12 version, and the power saving of the terminal is more beneficial after the Long DRX Cycle is changed.
The eDRX with UE in rrc_connected state modifies the start and restart time nodes of Drx InactivityTimer-r13 in two ways:
in an LTE system, when the UE successfully decodes the PDCCH, starting or restarting the Drx-Inactivity Timer; and if the running uplink and downlink data transmission is overtime in the NB-IoT system, the Drx-InactivityTimer-r13 is started.
In the LTE system, after the terminal receives the DRX Command control unit, timers such as On Duration Timer and DRX-Inactivity Timer are stopped; in the NB-IoT system, if the terminal receives the data scheduling instruction, the timer is stopped. The optimization of the Drx-InactivityTimer in the two aspects mainly moves the starting or restarting time of the Drx-InactivityTimer from the 'successfully decoded PDCCH' in LTE to the 'HARQ RTTTimer overtime', so that the parameters of the Drx-InactivityTimer can be more accurately configured. Because supporting enhanced coverage in a narrowband internet of things system, data transmission may be repeated for a long time, which may cause the time of Drx-incaactyittime to be difficult to configure.
The eDRX operation mechanism in the rrc_connected state is shown in fig. 2, and the UE is in a dormant state until the time t0, and the terminal in this state does not monitor the NPDCCH subframe; when the system frame number and the subframe number meet the formula (1), the UE enters an active state, on duration timer-r13 is started from the time t0, and the NPDCCH subframe is monitored before the timer is overtime. And receiving a new NPDCCH subframe indicating downlink transmission data at the time t1 of the activation period, starting the HARQ RTT Timer at the moment, starting the Drx-InactivityTimer-r13 after the secondary Timer is overtime, and monitoring the NPDCCH subframe during the running period of the Timer. After the Drx-InactivityTimer-r13 is overtime, detecting whether the data in the soft buffer in the corresponding HARQ Process is successfully decoded or not at the time t3, starting Drx RetransmissionTimer-r13 if the decoding is unsuccessful, and retransmitting the data during the continuous running period of the timer; after the data is correctly decoded, the UE detects a new NPDCCH subframe indicating uplink data transmission at the time t4, at the moment, the HARQ RTT Timer is started, after the time t5 of the Timer is overtime, the non-activated Timer Drx-InactivityTimer-r13 is started, and the NPDCCH subframe is monitored during the continuous running period of the Timer. At time t6, drx-InactigityTimer-r 13 times out, and then Drx-ULRransposionTimer-r 13 is started, and retransmission of uplink data is performed during continuous running of the timer.
The remote meter reading method of the water meter based on the eDRX communication technology ensures that the water meter communication has real-time performance and bidirectional performance, the instruction to be issued by the main station platform system can be issued at any time, and the instruction can reach the water meter and be executed after waiting for one eDRX period at most, and is mainly applied to the aspects of real-time control valve, real-time meter reading, distributed meter reading and the like. In addition, when the water meter reports data, the interaction process between the water meter and the base station is reduced, and the reporting time is greatly shortened, so that the power consumption of the reporting process is greatly saved, the reporting conflict is reduced, the reporting success rate is improved, and the method has good market application prospect.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. The remote meter reading method of the water meter based on the eDRX communication technology is characterized in that the eDRX works in two modes of RRC_IDLE and RRC_CONNECTED; when the UE is in an RRC_IDLE state, the UE periodically monitors a broadcast channel and a call channel, and discontinuously receives a message from an eNodeB; when the UE needs to receive service data, the UE jumps to an RRC_CONNECTED state from an RRC_IDLE state; discontinuous reception of the UE in the RRC_CONNECTED state is completed through a set of timers, wherein the timers comprise an OnDuationTimer-r 13, a Drx-StartOffset-r13 and a Drx-InactivityTimer-r13, and the specific steps comprise:
s1, RRC configures eDRX parameters, and UE calculates a subframe for starting OnDuationTimer-r 13 through a formula;
s2, judging whether the HARQ RTTTimer is overtime and whether the decoding of the data in the HARQ cache data is successful or not; if yes, further judging whether a new NPDCCH is received in the OnDuationTimer-r 13; if not, starting the DrxRecranspossessionTimer-r 13 of the HARQProcess, and retransmitting data;
s3, judging whether a new NPDCCH is received in the OnDuationTimer-r 13; if yes, starting the HARQRTTTimer; if not, continuously monitoring NPDCCH until the On duration timer-r13 is overtime;
s4, when the HARQRTTimer is overtime, starting a Drx-InactivityTimer-r13, and judging whether the UE receives a scheduling instruction or not; if yes, stopping OnDuationTimer-r 13 and Drx-InactivityTimer-r13; if not, the Drx-InactivityTimer-r13 is started and restarted.
2. The method for remote meter reading of a water meter based on eDRX communication technology according to claim 1, wherein the timer onduration timer-r13 indicates an on-line time length after the UE sleeps in one eDRX cycle, and the values are as follows: pp1, pp2, pp3, pp4, pp8, pp16, pp32.
3. The eDRX communication technology-based remote meter reading method of water meter according to claim 1, wherein the timer Drx-StartOffset-r13 is used for designating an on duration timer-r13 pointer, which takes a value of 0-255.
4. The eDRX communication technology based water meter remote meter reading method of claim 1, wherein a timer harqtttimer represents a minimum number of subframes that the UE needs to wait before receiving the downlink retransmission data; when the PDCCH subframe is received and the downlink transmission is displayed or the DL-SPS subframe is positioned, a timer HARQRTTimer is started, and meanwhile, the Drx-retransmission Time-r13 is stopped.
5. The eDRX communication technology based water meter remote meter reading method as claimed in claim 1, wherein the timer Drx-incactivity timer-r13 is turned on after a specified harq rtttimer times out, and continuously monitors NPDCCH subframes during operation, and the value is: pp0, pp1, pp2, pp3, pp4, pp8, pp16, pp32, the basic timing unit of which is the number of NPDCCH subframes.
6. The eDRX communication technology-based remote meter reading method of water meter of claim 1, wherein after the timer Drx-retransmission timer-r13 designates the harq rtttimer to be timed out, the corresponding data in the harq process is repeatedly transmitted in the continuous time, and the value is as follows: pp0, pp1, pp2, pp4, pp6, pp8, pp16, pp24, pp33.
7. The eDRX communication technology-based water meter remote meter reading method of claim 1, wherein in eDRX, the basic units of onduration timer-r13, drx-incarvitytimer-r 13 and Drx-retransmission timer-r13 are changed from original subframes to pp, and the length of pp is a dynamically variable unit.
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