CN111263337B - Internet of things terminal discontinuous receiving method based on service time delay - Google Patents

Internet of things terminal discontinuous receiving method based on service time delay Download PDF

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CN111263337B
CN111263337B CN202010160813.2A CN202010160813A CN111263337B CN 111263337 B CN111263337 B CN 111263337B CN 202010160813 A CN202010160813 A CN 202010160813A CN 111263337 B CN111263337 B CN 111263337B
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CN111263337A (en
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彭大芹
许静
何金秀
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China Mobile IoT Co Ltd
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Chongqing University of Post and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • 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
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • 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
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention relates to a Discontinuous Reception (DRX) method of an Internet of things terminal based on service delay, which comprises the following steps: the base station receives the information related to the service characteristics of the target terminal and obtains the longest tolerant time delay D of the service of the target terminal from the information5QI(ii) a The base station estimates the average waiting time delay D for transmitting data to the destination terminalDRX(ii) a Judgment of D5QIAnd DDRXAnd adjusting DRX period parameters according to the judgment result; the adjusted DRX cycle parameter is sent to the target terminal, so that the power efficiency of the 5G Internet of things terminal is improved, the electric quantity consumption is saved, and the service life of the terminal is prolonged.

Description

Internet of things terminal discontinuous receiving method based on service time delay
Technical Field
The invention belongs to the technical field of mobile internet of things, and particularly relates to a Discontinuous Reception (DRX) method of a terminal based on service delay.
Background
With the explosive growth of mass data and the increasing industrialization demand, mobile communication is gradually expanding from human-to-human connection to human-to-object connection. To meet the requirement of "everything interconnection", a fifth Generation Mobile Communication System (5G) has come into force. Large-scale Machine Type Communication (mtc) is an important application scenario of 5G, and is mainly oriented to large-scale internet of things services collected by sensors. The main characteristics of the terminal in the mtc scenario include ultra-high density (million/square kilometer connections), very low transmission number (several or more than ten bytes) and fixed, battery drive (low cost, limited output power), very long standby (at least 10 years), and the like.
In order to reduce the power consumption of the terminal, a DRX candidate technology is introduced in the 3GPP standard. The DRX is an operation mode of saving power consumption of the terminal, in which the terminal turns on the receiver to enter an active state only at necessary time to receive downlink data and signaling, and turns off the receiver to enter a sleep state at other time to stop receiving the downlink data and signaling. The terminal power saving can be measured by the proportion of the effective sleep time in the DRX period, the larger the effective sleep time is, the better the energy saving effect is, but the too large or too small sleep time can not meet the service requirement. However, in the existing technical framework, the configuration of the standard DRX parameters is fixed, the mtc service is widely applied, the related service types are various, the unified and fixed parameters cannot meet the requirements of all service scenarios, and the limitation is brought to the mass deployment of mtc. Therefore, there is a need for a flexible DRX parameter configuration to overcome the shortcomings of the prior art.
Non-patent document
Non-patent document 1: analysis and optimization design of DRX mechanism in Yuxiang, Song Yao, LTE system [ J ] Chongqing post and electric university journal (Nature science edition), 2014,026(003): 299-.
Disclosure of Invention
In view of this, the present invention provides a discontinuous reception method for an internet of things terminal based on service delay, and in particular relates to a method for DRX long-period dynamic configuration and scheduling, so as to effectively reduce power consumption of the terminal and adapt to diversity requirements of mtc services.
In order to achieve the purpose, the invention provides the following technical scheme:
a Discontinuous Reception (DRX) method for an Internet of things terminal based on service delay is characterized by comprising the following steps: the base station receives information related to the service characteristics of the destination terminal, from which it receives informationObtaining the longest tolerant time delay D of the target terminal service5QI(ii) a The base station estimates the average waiting time delay D for transmitting data to the destination terminalDRX(ii) a Judgment of D5QIAnd DDRXAnd adjusting DRX period parameters according to the judgment result; and sending the adjusted DRX period parameter to a target terminal.
Preferably, the base station receiving the information related to the service characteristics of the destination terminal comprises the base station receiving a data service transmitted to the destination terminal.
Preferably, the base station receiving the information related to the service characteristics of the destination terminal further comprises the base station receiving signaling related to the service characteristics of the destination terminal.
Preferably, the longest tolerant delay D of the destination terminal service5QIIs the information extracted according to the 5QI characteristics of the service.
Preferably, the base station estimates an average latency D for data transmission to the destination terminalDRXComprising DDRX＝Ds+DLWherein D isSIndicating DRX short cycle delay, DLIndicating DRX long cycle delay.
Preferably, the DRX short cycle delay comprises
Figure BDA0002405717140000021
Wherein p isjRepresenting the probability, T, of data arriving at the destination terminal in the jth of the Ns DRX short cyclesdsRepresenting a DRX short cycle duration; the DRX long cycle delay comprises
Figure BDA0002405717140000022
Wherein p isjRepresenting the probability of data arriving at the jth cycle in any DRX long cycle after Ns short cycles, TdlIndicating DRX long cycle duration, DL0Indicating that the DRX long cycle is initialized.
Preferably, the probability that the data reaches the destination terminal in the jth short period or long period is:
Figure BDA0002405717140000023
wherein λ isipcIs the service strength, T, in the packet arrival time intervalIIs the drx-InactivetyTimer timer length, TdsIs a short cycle duration, NsIs the number of short periods, λisAs session gap strength, DL0To initialize the DRX long cycle, μpcMean value, P, representing the number of group calls in the current sessionpcIs the probability that a new packet call is in the current session
Figure BDA0002405717140000024
PsIs the probability that a new packet call will arrive at the start of the next session
Figure BDA0002405717140000025
Figure BDA0002405717140000028
In order to scale the coefficients of the image,
Figure BDA0002405717140000026
configuring the duration of the nth DRX long cycle for initialization,
Figure BDA0002405717140000027
is j to NsThe duration of each DRX long cycle, i, is a micro-adjustment parameter.
Preferably, the judgment D5QIAnd DDRXAnd according to the judgment result, adjusting DRX cycle parameters, if D5QI＞DDRXThen using the scaling factor
Figure BDA0002405717140000029
Lengthening the long period duration T of the destination terminaldl(ii) a If D is5QI＜DDRXThen using the scaling factor
Figure BDA0002405717140000038
Shortening long period duration T of destination terminaldl(ii) a If D is5QI＝DDRXIf not, the operation is not carried out; the method specifically comprises the following steps:
Figure BDA0002405717140000031
Figure BDA0002405717140000032
Tmin<Tdl<Tmaxwherein, in the process,
Figure BDA0002405717140000033
in order to scale the coefficients of the image,
Figure BDA0002405717140000034
configuring the duration of the nth DRX long cycle for initialization, wherein i is a micro-adjustment parameter; wherein the scaling factor
Figure BDA0002405717140000035
At D5QI＞DDRXWhen the temperature of the water is higher than the set temperature,
Figure BDA0002405717140000036
at D5QI＜DDRXWhen the temperature of the water is higher than the set temperature,
Figure BDA0002405717140000037
the method in the disclosure reasonably extends the DRX long-cycle sleep time by using the 5QI service allowed maximum delay and DRX long-cycle dynamic configuration in the 3GPP TS23.501 standard, and satisfactorily solves the technical problem that the current standard DRX configuration is not satisfied with diversified services.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
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In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
figure 1 is a diagram of a DRX cycle shown in the 3GPP standard;
FIG. 2 is a diagram illustrating a short DRX cycle and a long DRX cycle in accordance with the 3GPP standard;
FIG. 3 is a schematic diagram of the system of the present invention;
fig. 4 is a flow chart of the present invention.
Detailed Description
The invention is further described in the following with reference to the drawings.
Fig. 1 is a schematic diagram of a DRX cycle in the 3GPP standard, where the DRX cycle is repeatedly switched between on duration and opportunity for DRX after the terminal enters the DRX mode, and a time period formed by one on duration and one opportunity for DRX is called the DRX cycle. During on duration, the terminal attempts to monitor the PDCCH from the base station transmission while a drx-onDurationTimer timer is started. Before the time of the DRX-onDurationTimer is overtime, the UE will continue to monitor the PDCCH, and if the PDCCH sent to the UE cannot be monitored until the time of the DRX-onDurationTimer is overtime, the terminal enters the first opportunity for DRX; if the PDCCH sent to the user is monitored before the timer is overtime, stopping the timer, starting a drx-InactivetyTimer timer, and starting to receive data scheduled by the PDCCH; when the drx-InactivityTimer is overtime, if the reception is not finished, restarting or prolonging the timer; and if the reception is finished, the terminal enters the first opportunity for DRX.
After the terminal enters the first opportunity for DRX, the terminal keeps a certain period to start a DRX-onDurationTimer, so that the terminal can periodically try to monitor the PDCCH. After a certain time or a certain number of cycles, if no data is sent to the terminal, the terminal may enter a DRX cycle with a longer DRX cycle than the previous cycle, where the cycle duration is called short DRX cycle or shallow sleep period, and the terminal is in a shallow sleep state; the cycle duration is called long DRX cycle or deep sleep period, and the terminal is in deep sleep state. Generally, the duration period length is the same in either the short DRX cycle or the long DRX cycle, and it is the length of opportunity for DRX that is variable. That is, the long DRX cycle is longer in the opportunity for DRX period than the short DRX cycle, as shown in fig. 2.
Referring to fig. 3, in a system 300, a base station 302 is included, and a plurality of internet of things terminals 304a, 304b, 304c, and 304 d. The plurality of internet of things terminals each have data traffic with different QoS requirements, and the base station 302 communicates with the plurality of internet of things terminals via the wireless link 306, including sending and receiving data traffic related to each terminal, and signaling information.
Referring to fig. 4, the acquiring, by the base station, the information related to the service characteristics includes that the base station receives service data to be sent to each terminal and signaling related to QoS characteristics of the terminal, where the data and the signaling may be data sent from a sending end or information reported by a destination terminal. It should be noted that in different mobile communication systems, the QoS related signaling may be expressed in different manners, such as QoS Class Identifier (QCI) in LTE/LTE-a system and 5G QoS Identifier (5G QoS Identifier,5QI) in 5G NR system, but they are actually the same, and the 5QI and QCI in the present invention are not strictly distinguished. The 5QI is used to index a 5G QoS characteristic, and reference may be made to the content of the 3GPP standard TS 23.501.
After receiving the service data flow and QoS-related signaling, the base station may identify the type of data, the priority level, the packet delay budget, and other characteristics. The type of data can be distinguished into at least delay tolerant data and non-delay tolerant data. For delay tolerant data, the base station may not have to forward it to the destination terminal immediately. Since the terminal ends the DRX cycle immediately after detecting the PDCCH once the base station transmits the PDCCH to the terminal, and enters a continuous data reception phase.
Further, the base station side may configure DRX parameters of the destination terminal, and keep the time for transmitting data as synchronized as possible with the time for receiving data by the traffic destination terminal, or the base station side and the traffic destination terminal may negotiate for setting the parameters. Configured DRX parameters before the updating method of the present invention, the configured DRX parameters generally become initialization DRX parameters, that is, fixed DRX parameters configured by the base station for the terminal according to the 3GPP standard.
According to the content specified in the 3GPP protocol, the base station may configure the terminal with DRX parameters including at least a deactivation timer (DRX-InactivetyTimer), a DRX short cycle (DRX-short cycle), a DRX short cycle timer (DRX-short cycle timer), a duration timer (DRX-onDurationTimer), and a DRX long cycle (DRX-long cycle).
In the invention, the time length of the DRX long period is further adjusted by trying to introduce a migration factor and an adjustment coefficient on the basis. As follows:
Figure BDA0002405717140000041
in the formula:
Figure BDA0002405717140000051
is a scaling factor; i is an adjustment parameter; t isminAnd TmaxRespectively representing the minimum value and the maximum value of drx-LongCycle; t isdlIs the adjusted drx-LongCycle.
The base station side firstly calculates the waiting time delay of data transmission to the destination terminal according to the initially configured DRX parameters, namely the time delay brought by DRX. For the time delay caused by DRX, which may include short-cycle time delay and long-cycle time delay, the specific calculation method is as follows:
(1) and calculating the probability that the base station side packet does not arrive in the first j-1 DRX cycles and arrives at the receiving terminal in the jth cycle. And adopting an ETSI burst data flow model issued by a European telecommunication organization according to the burstiness and self-similarity of the mMTC service data flow. In the drx-inactivetytytimer timer, the probability that the receiving terminal does not continuously monitor the PDCCH in the current session is
Figure BDA0002405717140000052
Otherwise, the probability of the next session of the PDCCH without continuous monitoring is
Figure BDA0002405717140000053
The probability that the packet did not arrive in the first j-1 DRX cycles but arrived in the jth cycle is as follows:
Figure BDA0002405717140000054
in the formula, λipcIs the service strength, T, in the packet arrival time intervalIIs the drx-InactivetyTimer timer length, TdsIs the drx-ShortCycleTimer timer length, NsIs the drx-short cycle number, λisAs session gap strength, DL0To initialize DRX long cycle, mupcMean value, P, representing the number of divided calls in the current sessionpcIs the probability that a new packet call is in the current session
Figure BDA0002405717140000055
psIs the probability that a new packet call will arrive at the start of the next session
Figure BDA0002405717140000056
Figure BDA0002405717140000057
In order to scale the coefficients of the image,
Figure BDA0002405717140000058
for the duration of the nth DRX long cycle,
Figure BDA0002405717140000059
denotes the j-NsThe duration of each DRX long cycle, i, is a fine tuning parameter, and wherein,
Figure BDA00024057171400000510
and
Figure BDA00024057171400000511
calculated according to the method of non-patent document 1,
Figure BDA00024057171400000512
(2) and calculating the time delay in the DRX short period. The following were used:
Figure BDA00024057171400000513
(3) and calculating the time delay in the DRX long period. Including the updated DRX long cycle and the initialization DRX long cycle, as follows:
Figure BDA00024057171400000514
(4) calculating DRX time delay: dDRX＝Ds+DL
And acquiring a service delay upper limit threshold allowed by data from the received 5QI, and reasonably expanding or contracting the DRX long period. The essence of the extended DRX long period is to prolong the sleep time in the period so as to save the battery power of the receiving terminal to the maximum extent. Shrinking the DRX long cycle is a service that affects the user experience for DRX delays exceeding the 5QI maximum allowed delay. Suppose the upper threshold of the allowed service delay in the 5QI identifier is D5QI. Judging if D isDRX<D5QIAccording to
Figure BDA0002405717140000061
Forward shifting the DRX period to the next longer DRX period, and circulating one by one until the DRX time delay is slightly less than D5QI(ii) a If D isDRX>D5QIAccording to
Figure BDA0002405717140000063
Reverse migration is carried out on the DRX period to an adjacent smaller DRX long period until the DRX time delay is slightly smaller than D5QI(ii) a When D is presentDRX＝D5QIThe DRX long cycle is not adjusted. By using
Figure BDA0002405717140000062
Post-migration DDRXNumerical values may be related to D5QIThere is still a certain difference space, which can be further extended according to i until the DRX time delay is closer and slightly less than D5QITherefore, the balance between service delay and energy conservation maximization is achieved.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The above-mentioned embodiments, which are further detailed for the purpose of illustrating the invention, technical solutions and advantages, should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements, etc. made to the present invention within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A Discontinuous Reception (DRX) method for an Internet of things terminal based on service delay is characterized by comprising the following steps: the base station receives the information related to the service characteristics of the target terminal and obtains the longest tolerant time delay D of the service of the target terminal from the information5QI(ii) a The base station estimates the average waiting time delay D for transmitting data to the destination terminalDRXSaid average latency DDRXComprising DDRX＝Ds+DLWherein D isSIndicating DRX short cycle delay, DLRepresenting a DRX long cycle delay; judgment of D5QIAnd DDRXAnd adjusting DRX period parameters according to the judgment result; sending the adjusted DRX period parameter to a target terminal; wherein the adjusting DRX cycle parameter includes, if D5QI＞DDRXThen using the scaling factor
Figure FDA0003601167940000019
Lengthening the long period duration T of the destination terminaldl(ii) a If D is5QI＜DDRXThen using the scaling factor
Figure FDA00036011679400000110
Shortening long period duration T of destination terminaldl(ii) a If D is5QI＝DDRXIf not, the operation is not carried out; the method specifically comprises the following steps:
Figure FDA0003601167940000011
Tmin＜Tdl＜Tmaxwherein, in the step (A),
Figure FDA0003601167940000012
in order to scale the coefficients of the image,
Figure FDA0003601167940000013
configuring the duration of the nth DRX long cycle for initialization, wherein i is a micro-adjustment parameter; wherein the scaling factor
Figure FDA0003601167940000014
At D5QI＞DDRXWhen the temperature of the water is higher than the set temperature,
Figure FDA0003601167940000015
at D5QI＜DDRXWhen the temperature of the water is higher than the set temperature,
Figure DEST_PATH_IMAGE002
。
2. the method of claim 1, further characterized in that the base station receiving information related to a service characteristic of the destination terminal comprises the base station receiving a data service directed to the destination terminal.
3. The method of claim 1, further characterized in that the base station receiving information related to a destination terminal traffic characteristic further comprises the base station receiving signaling related to a destination terminal traffic characteristic.
4. The method of claim 1, further characterized by a longest-tolerated delay D for traffic of the destination terminal5QIIs the information extracted according to the 5QI characteristics of the service.
5. The method as recited in claim 1 further characterized in that said DRX short cycle delay comprises
Figure FDA0003601167940000017
Wherein p isjRepresents the probability of data arriving at the destination terminal in the jth period of Ns DRX short periods, TdsRepresents a DRX short cycle duration; the DRX long cycle delay comprises
Figure FDA0003601167940000018
Wherein p isjRepresenting the probability of data arriving at the jth cycle in any DRX long cycle after Ns short cycles, TdlIndicating DRX long cycle duration, DL0Indicating that the DRX long cycle is initialized.
6. The method of claim 1 or 5, further characterized in that the probability of the data reaching the destination terminal in the jth short or long period is:
Figure FDA0003601167940000021
wherein λ isipcIs the service strength, T, in the packet arrival time intervalIIs the drx-InactivetyTimer timer length, TdsIs a short cycle duration, NsIs the number of short periods, λisAs session gap strength, DL0To initialize DRX long cycle, mupcMean value, P, representing the number of group calls in the current sessionpcIs the probability that a new packet call is in the current session
Figure FDA0003601167940000022
PsIs the probability that a new packet call will arrive at the start of the next session
Figure FDA0003601167940000023
Figure FDA0003601167940000024
In order to scale the coefficients of the image,
Figure FDA0003601167940000025
configuring the duration of the nth DRX long cycle for initialization,
Figure FDA0003601167940000026
and i is a micro-adjustment parameter, wherein the duration of the j-Ns long DRX periods is shown.
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