CN112911555B - Wireless network communication resource scheduling method and system based on information age - Google Patents

Wireless network communication resource scheduling method and system based on information age Download PDF

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CN112911555B
CN112911555B CN202110119244.1A CN202110119244A CN112911555B CN 112911555 B CN112911555 B CN 112911555B CN 202110119244 A CN202110119244 A CN 202110119244A CN 112911555 B CN112911555 B CN 112911555B
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base station
information
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CN112911555A (en
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刘振宇
罗祾
华珉
李文清
潘爱强
刘哲
陈智勇
夏斌
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Shanghai Jiaotong University
State Grid Shanghai Electric Power Co Ltd
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State Grid Shanghai Electric Power Co Ltd
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
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    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract

The invention provides a wireless network communication resource scheduling method based on information age, which comprises the steps of establishing a wireless D2D communication system which is controlled by a base station in a centralized way, and initializing system parameters; D2D transceiver equipment sends the state information of the current time slot to the base station; the base station calculates the instant information age A of the current time slot according to the received state informationi(k) Probability of transmission success mu for each linki(k) And expected information age of next slot E [ A ]i(k+1)](ii) a Base station solving for link activation decision xi(k) The integer programming problem of (1) to obtain the age of the expected information E [ A ] for the next sloti(k+1)]Link activation decision xi(k) The solution of (1); base station will link activation decision
Figure DDA0002921382650000011
Sending the link information to a corresponding link i; and the D2D link transmits information according to the received link activation decision, and records the transmission result after the transmission is finished. The wireless network communication resource scheduling method and system based on the information age provide basis for transmission fairness among all links, and improve instantaneity and information timeliness of the whole system.

Description

Wireless network communication resource scheduling method and system based on information age
Technical Field
The present invention relates to the technical field of information age, and in particular, to a method and a system for scheduling wireless network communication resources based on information age.
Background
With the continuous increase of the number of mobile devices, the emergence of multimedia applications such as mobile games, high-definition movies, and video conferences, and the gradual popularization of the concept of internet of things, the rapid development of cellular mobile communication technology is promoted, and the demand for higher data rate and service quality is also increased. The traffic pressure of wireless networks is increasing, which pushes the research of the spectrum utilization of fifth generation cellular networks. Device-to-device communication is another solution that can improve network spectrum utilization, in addition to reducing cell radius and adding more network resources.
D2D communication enables mobile devices in close proximity to communicate directly without the need for base station relay. The inherent advantages of D2D communication in local data traffic also make it applicable to fields including public safety services, car networking, cellular network traffic offload, disaster relief, multi-hop relay, and environmental monitoring. At the same time, the importance of low latency cyber-physical system applications continues to grow. Automatic driving requires the most real-time data of the surrounding environment, remote surgery requires accurate real-time updating of the position of a surgical tool, and the development of the internet of things network also puts higher requirements on the real-time transmission of information. However, the time delay is only used as an index, and whether the information is fresh or not cannot be accurately reflected.
Information age, which is an emerging indicator describing the timeliness of information viewed from the receiving end's perspective, is defined as the time elapsed since the time of generation of the information by the receiving end was most recently received and utilized. In a D2D communication network, timely updates are not equal to maximizing system throughput or transmission rate, nor maximizing system utilization. Information updating only according to the channel state is good or bad, so that serious unfairness is caused, the real-time performance of partial links is poor, and the fairness cannot be quantitatively evaluated through common proportional fair scheduling. For a D2D communication network with real-time data transmission requirement, the information age can be used as a main performance index to schedule and allocate communication resources of the system, thereby improving the system performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a wireless network communication resource scheduling method and system based on information age.
The invention provides a wireless network communication resource scheduling method based on information age, which comprises the following steps:
step 1: establishing a wireless D2D communication system which is controlled by a base station in a centralized way, and initializing system parameters;
step 2: D2D transceiver equipment sends the state information of the current time slot to the base station;
and step 3: the base station calculates the instant information age A of the current time slot according to the received state informationi(k) Probability of transmission success mu for each linki(k) And expected information age of next slot E [ A ]i(k+1)]；
And 4, step 4: base station solving for link activation decision xi(k) The integer programming problem of (1) to obtain the age of the expected information E [ A ] for the next sloti(k+1)]Link activation decision xi(k) The solution of (1);
and 5: base station will link activation decision
Figure BDA0002921382630000021
Sending the link information to a corresponding link i;
step 6: the D2D link transmits information according to the received link activation decision, and records the transmission result after the transmission is finished; and when the current time slot is ended, making k equal to k +1, and returning to execute the step 2.
Preferably, the step 1 of establishing the wireless D2D communication system centrally controlled by the base station includes: a plurality of D2D transceivers transmitting time-sensitive information with randomly distributed spatial positions and a base station for centralized control of D2D link transmission scheduling;
the base station completes direct information transmission between devices through a signaling centralized control link, and the base station performs centralized control on the initial D2D wireless communication systemInitializing system parameters, the initializing system parameters comprising: the equipment sends the transmission power P and the signal-to-interference-and-noise-ratio decoding threshold value beta of the equipment to the number N, D2DiWhere i denotes the ith link, the initial time slot k is 1, and the initial instantaneous information age a of each linki(k|k＝1)。
Preferably, the step 2, the D2D transceiver device sending the status information of the current time slot to the base station includes: transmission state b of the receiving device in the last time slot k-1i(k-1) wherein bi(k-1) ═ 1 indicates that information is updated, bi(k-1) ═ 0 indicates that the information has not been updated; position information of receiver and transmitter for each link
Figure BDA0002921382630000022
Figure BDA0002921382630000023
Wherein the content of the first and second substances,
Figure BDA0002921382630000024
two-dimensional spatial coordinates representing the transmitter and receiver, respectively, are obtained by a global satellite navigation system.
Preferably, the base station stores the age a of the instant message of each link using the last time slot in step 3i(k-1) and received transmission status bi(k-1) calculating the instantaneous information age A of each link in the current time sloti(k)＝Ai(k-1)[1-bi(k-1)]+1. The base station calculates the transmission success probability of each link, the transmission success probability mu of the link i in the current time slot ki(k) The calculation formula is as follows:
Figure BDA0002921382630000025
wherein
Figure BDA0002921382630000026
Figure BDA0002921382630000031
xi(k) Indicating that the base station is in k pairs of time slotsLink activation decision, x, made by Link ii(k) Transmission is represented by 1, xi(k) 0 means no transmission, hjiDenotes the small-scale fading between the transmitter of link j and the receiver of link i, α denotes the path loss exponent, ρiIndicating that the probability of success of the transmission is affected by environmental noise, DjiIndicating that the probability of success of the transmission of link i is affected by the interference of the transmitter of link j, djiRepresenting the distance, σ, between the transmitter of link j and the receiver of link i2Representing additive white gaussian noise in the environment. The base station calculates the expected information age E [ A ] of the next time sloti(k+1)]The calculation formula is as follows:
Figure BDA0002921382630000032
preferably, the base station in step 4 solves the decision x about link activationi(k) The integer programming problem of (2), said integer programming problem being as follows:
Figure BDA0002921382630000033
obtaining a solution of the integer programming problem by calculation
Figure BDA0002921382630000034
The invention also provides a wireless network communication resource scheduling system based on the information age, which comprises the following modules:
module M1: establishing a wireless D2D communication system which is controlled by a base station in a centralized way, and initializing system parameters;
module M2: D2D transceiver equipment sends the state information of the current time slot to the base station;
module M3: the base station calculates the instant information age A of the current time slot according to the received state informationi(k) Probability of transmission success mu for each linki(k) And expected information age of next slot E [ A ]i(k+1)]；
Module M4: base station solving for link activation decision xi(k) The integer programming problem of (1) to obtain the age of the expected information E [ A ] for the next sloti(k+1)]Link activation decision xi(k) The solution of (1);
module M5: base station will link activation decision
Figure BDA0002921382630000035
Sending the link information to a corresponding link i;
module M6: the D2D link transmits information according to the received link activation decision, and records the transmission result after the transmission is finished; when the current time slot is over, let k be k +1, and return to the execution module M2.
Preferably, the module M1 for establishing a wireless D2D communication system centrally controlled by a base station comprises: a plurality of D2D transceivers transmitting time-sensitive information with randomly distributed spatial positions and a base station for centralized control of D2D link transmission scheduling;
the base station completes direct information transmission among devices through a signaling centralized control link, and the initialization system parameters of the D2D wireless communication system controlled by the base station in a centralized manner include: the equipment sends the transmission power P and the signal-to-interference-and-noise-ratio decoding threshold value beta of the equipment to the number N, D2DiWhere i denotes the ith link, the initial time slot k is 1, and the initial instantaneous information age a of each linki(k|k＝1)。
Preferably, the D2D transceiver device in the module M2 transmitting the status information of the current time slot to the base station includes: transmission state b of the receiving device in the last time slot k-1i(k-1) wherein bi(k-1) ═ 1 indicates that information is updated, bi(k-1) ═ 0 indicates that the information has not been updated; position information of receiver and transmitter for each link
Figure BDA0002921382630000041
Figure BDA0002921382630000042
Wherein the content of the first and second substances,
Figure BDA0002921382630000043
respectively represent hairAnd the two-dimensional space coordinates of the emitter and the receiver are obtained through a global satellite navigation system.
Preferably, the module M3 stores the instantaneous information age a of each link by the base station using the last time sloti(k-1) and received transmission status bi(k-1) calculating the instantaneous information age A of each link in the current time sloti(k)＝Ai(k-1)[1-bi(k-1)]+1. The base station calculates the transmission success probability of each link, the transmission success probability mu of the link i in the current time slot ki(k) The calculation formula is as follows:
Figure BDA0002921382630000044
wherein
Figure BDA0002921382630000045
Figure BDA0002921382630000046
xi(k) Indicating the link activation decision, x, made by the base station on link i at time slot ki(k) Transmission is represented by 1, xi(k) 0 means no transmission, hjiDenotes the small-scale fading between the transmitter of link j and the receiver of link i, α denotes the path loss exponent, ρiIndicating that the probability of success of the transmission is affected by environmental noise, DjiIndicating that the probability of success of the transmission of link i is affected by the interference of the transmitter of link j, djiRepresenting the distance, σ, between the transmitter of link j and the receiver of link i2Representing additive white gaussian noise in the environment. The base station calculates the expected information age E [ A ] of the next time sloti(k+1)]The calculation formula is as follows:
Figure BDA0002921382630000047
preferably, the base station in said module M4 solves the decision x on link activationi(k) The integer programming problem of (2), said integer programming problem being as follows:
Figure BDA0002921382630000048
obtaining a solution of the integer programming problem by calculation
Figure BDA0002921382630000049
Compared with the prior art, the invention has the following beneficial effects:
1. the invention considers the time average AoI of the whole system based on the D2D communication resource management and interference suppression scheme which is different from the optimized aim of improving the throughput or the information transmission rate, provides a basis for the transmission fairness among all links, and simultaneously improves the real-time performance and the information timeliness of the whole system.
2. According to the invention, the base station collects and processes the system state information in a centralized manner and obtains the scheduling strategy so as to guide the devices in the range to perform direct transmission among the devices based on the information age minimum criterion, so that the overall scheduling capability of the base station and the spectrum efficiency gain of the direct transmission among the devices are fully utilized, and the system spectrum utilization rate is improved.
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Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a system flow diagram of the present invention;
FIG. 2 is a schematic diagram of the system of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Referring to fig. 1, the present invention provides a wireless network communication resource scheduling method and system based on information age, including the following steps:
step 1: establishing a wireless D2D communication system which is controlled by a base station in a centralized way, and initializing system parameters;
step 2: when the kth time slot starts, all D2D transceiver devices send the state information of the current time slot to the base station;
and step 3: the base station calculates the instant information age A of the current time slot according to the received state informationi(k) Probability of transmission success mu for each linki(k) And expected information age of next slot E [ A ]i(k+1)]；
And 4, step 4: base station solving for link activation decision xi(k) The integer programming problem of (1) to obtain the age of the expected information E [ A ] for the next sloti(k+1)]Minimum link activation decision xi(k) The optimal solution of (2);
and 5: base station will link activation decision
Figure BDA0002921382630000051
Sending the link information to a corresponding link i;
step 6: each D2D link activating a decision based on the received link
Figure BDA0002921382630000052
Carrying out information transmission, and recording a transmission result after the transmission is finished; and when the current time slot is ended, making k equal to k +1, and returning to execute the step 2.
The D2D wireless communication system centrally controlled by the base station, which is established in step 1, comprises: the D2D transceiver pairs with randomly distributed space positions for transmitting time-sensitive information and a base station for centralized control of D2D link transmission scheduling complete direct information transmission between devices through signaling centralized control links. Initializing parameters of a D2D wireless communication system centrally controlled by a base station, the system parameters including: the number of the equipment pairs is marked as N; D2D sending equipment transmitting power, which is marked as P; SINR decoding threshold, denoted as betaiWherein i represents the ith link; initial time slot k is 1; initial instantaneous information age A of each linki(k|k＝1)。
The step 2 of the D2D transceiver device sending the status information of the current time slot to the base station includes: transmission by a receiving device in the last time slot k-1State bi(k-1) wherein bi(k-1) ═ 1 indicates that information is updated, bi(k-1) ═ 0 indicates that the information has not been updated; position information of receiver and transmitter for each link, noted
Figure BDA0002921382630000061
Figure BDA0002921382630000062
Wherein the content of the first and second substances,
Figure BDA0002921382630000063
two-dimensional spatial coordinates representing the transmitter and receiver, respectively, are obtained by a global satellite navigation system.
In the step 3: the base station uses the stored instantaneous information age A of each link in the last time sloti(k-1) and received transmission status bi(k-1) calculating the instant information age of each link in the current time slot: a. thei(k)＝Ai(k-1)[1-bi(k-1)]+1. The base station calculates the transmission success probability of each link, the transmission success probability mu of the link i in the current time slot ki(k) The calculation formula is as follows:
Figure BDA0002921382630000064
wherein
Figure BDA0002921382630000065
Figure BDA0002921382630000066
xi(k) Indicating the link activation decision, x, made by the base station on link i at time slot ki(k) Transmission is represented by 1, xi(k) 0 means no transmission, hjiDenotes the small-scale fading between the transmitter of link j and the receiver of link i, α denotes the path loss exponent, ρiIndicating that the probability of success of the transmission is affected by environmental noise, DjiIndicating that the probability of success of the transmission of link i is affected by the interference of the transmitter of link j, djiRepresenting the distance, σ, between the transmitter of link j and the receiver of link i2Representing additive white gaussian noise in the environment. The base station calculates the expected information age E [ A ] of the next time sloti(k+1)]The calculation formula is as follows:
Figure BDA0002921382630000067
Figure BDA0002921382630000068
in the step 4: base station solving for link activation decision xi(k) The integer programming problem of (2), said integer programming problem being as follows:
Figure BDA0002921382630000069
obtaining the optimal solution of the integer programming problem through calculation
Figure BDA00029213826300000610
In the step 6: for any link i, if
Figure BDA00029213826300000611
The link i does not transmit information in the current time slot, and the transmission result is recorded as bi(k) If is equal to 0
Figure BDA00029213826300000612
The transmitter of the link i sends the latest information to the corresponding receiver in the current time slot, if the transmission is unsuccessful, bi(k) 0, if the transmission is successful, bi(k)＝1。
The invention provides a wireless network communication resource scheduling method and system based on information age, which comprehensively consider the geographical position of each direct communication D2D equipment pair, channel state information and the instant information age of each link to make scheduling decision.
Referring to fig. 2, for a pair of D2D communication devices that need to transmit time-sensitive information, the average AoI of the information of interest is an important indicator to assess the freshness of the information. Since operating in the same frequency band, the receiving device of any D2D link will receive signal interference from all other transmitting devices within range, and activating all links will cause significant interference resulting in almost all links failing to transmit successfully. Reasonable link scheduling policies are needed to guide whether each link is active so that each link can reach a minimum of AoI.
The channel state of the receiving equipment of the link 1 is better, the influence of interference is smaller, the transmission success probability is high, if the target with the maximum transmission rate is adopted, the link 1 is often scheduled to carry out transmission, but because the transmitting equipment of the link 1 is closer to the receiving equipment of the links 5 and 6, the transmission probability of the links 5 and 6 is reduced, and the information age is reduced; the receiving device of the link 2 is far away from the sending device and is seriously interfered by the sending devices of the links 3 and 4, and in order to reduce the information age of the link 2, the link 2 needs to be activated for transmission under the condition that the links 3 and 4 are not activated; the channel links of links 5, 6 cross each other and alternate activation may reach a lower level of AoI.
The wireless network communication resource scheduling method and system based on the information age improve the real-time performance and the information timeliness of the whole system and improve the frequency spectrum utilization rate of the system.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be fully implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. A wireless network communication resource scheduling method based on information age is characterized by comprising the following steps:
step 1: establishing a wireless D2D communication system which is controlled by a base station in a centralized way, and initializing system parameters;
step 2: D2D transceiver equipment sends the state information of the current time slot to the base station;
and step 3: the base station calculates the instant information age A of the current time slot according to the received state informationi(k) Probability of transmission success mu for each linki(k) And expected information age of next slot E [ A ]i(k+1)]；
And 4, step 4: base station solving for link activation decision xi(k) The integer programming problem of (1) to obtain the age of the expected information E [ A ] for the next sloti(k+1)]Link activation decision xi(k) The solution of (1);
and 5: base station will link activation decision
Figure FDA0003490243340000011
Sending the link information to a corresponding link i;
step 6: the D2D link transmits information according to the received link activation decision, and records the transmission result after the transmission is finished; and when the current time slot is ended, making k equal to k +1, and returning to execute the step 2.
2. The method according to claim 1, wherein the step 1 of establishing the wireless D2D communication system centrally controlled by the base station comprises: a plurality of D2D transceivers transmitting time-sensitive information with randomly distributed spatial positions and a base station for centralized control of D2D link transmission scheduling;
the base station completes direct information transmission among devices through a signaling centralized control link, and the initialization system parameters of the D2D wireless communication system controlled by the base station in a centralized manner include: the equipment sends the transmission power P and the signal-to-interference-and-noise-ratio decoding threshold value beta of the equipment to the number N, D2DiWhere i denotes the ith link, the initial time slot k is 1, and the initial instantaneous information age a of each linki(k)，k＝1。
3. The method of claim 1, wherein the step 2 of the D2D transceiver device sending the status information of the current time slot to the base station comprises: transmission state b of the receiving device in the last time slot k-1i(k-1) wherein bi(k-1) ═ 1 indicates that information is updated, bi(k-1) ═ 0 indicates that the information has not been updated; position information of receiver and transmitter for each link
Figure FDA0003490243340000012
Figure FDA0003490243340000013
Wherein the content of the first and second substances,
Figure FDA0003490243340000014
two-dimensional spatial coordinates representing the transmitter and receiver, respectively, are obtained by a global satellite navigation system.
4. The method as claimed in claim 1, wherein the base station uses the instantaneous information age a of each link saved in the last time slot in step 3i(k-1) and received transmission status bi(k-1) calculating the instantaneous information age A of each link in the current time sloti(k)＝Ai(k-1)[1-bi(k-1)]+ 1; the base station calculates the transmission success probability of each link, the transmission success probability mu of the link i in the current time slot ki(k) Meter for measuringThe calculation formula is as follows:
Figure FDA0003490243340000021
wherein
Figure FDA0003490243340000022
Figure FDA0003490243340000023
xi(k) Indicating the link activation decision, x, made by the base station on link i at time slot ki(k) Transmission is represented by 1, xi(k) 0 means no transmission, xj(k) Represents the link activation decision h made by the base station on link j in time slot kjiRepresents the small scale fading, h, between the transmitter of link j and the receiver of link iiiRepresents the small-scale fading between the transmitter of link i and the receiver of link i, alpha represents the path loss exponent, ρiIndicating that the probability of success of the transmission is affected by environmental noise, DjiIndicating that the probability of success of the transmission of link i is affected by the interference of the transmitter of link j, djiRepresents the distance between the transmitter of link j and the receiver of link i, diiRepresents the distance between the transmitter of link i and the receiver of link i; sigma2Representing additive white gaussian noise in the environment; D2D transmitting equipment transmitting power P, signal interference noise ratio decoding threshold value betai(ii) a The base station calculates the expected information age E [ A ] of the next time sloti(k+1)]The calculation formula is as follows:
Figure FDA0003490243340000024
5. the method as claimed in claim 1, wherein the base station solves the decision x about link activation in step 4i(k) The integer programming problem of (2), said integer programming problem being as follows:
Figure FDA0003490243340000025
Figure FDA0003490243340000026
obtaining a solution of the integer programming problem by calculation
Figure FDA0003490243340000027
And N, the number of the equipment pairs.
6. A wireless network communication resource scheduling system based on information age is characterized by comprising the following modules:
module M1: establishing a wireless D2D communication system which is controlled by a base station in a centralized way, and initializing system parameters;
module M2: D2D transceiver equipment sends the state information of the current time slot to the base station;
module M3: the base station calculates the instant information age A of the current time slot according to the received state informationi(k) Probability of transmission success mu for each linki(k) And expected information age of next slot E [ A ]i(k+1)]；
Module M4: base station solving for link activation decision xi(k) The integer programming problem of (1) to obtain the age of the expected information E [ A ] for the next sloti(k+1)]Link activation decision xi(k) The solution of (1);
module M5: base station will link activation decision
Figure FDA0003490243340000028
Sending the link information to a corresponding link i;
module M6: the D2D link transmits information according to the received link activation decision, and records the transmission result after the transmission is finished; when the current time slot is over, let k be k +1, and return to the execution module M2.
7. The information age-based wireless network communication resource scheduling system of claim 6, wherein the module M1 for establishing the wireless D2D communication system centrally controlled by the base station comprises: a plurality of D2D transceivers transmitting time-sensitive information with randomly distributed spatial positions and a base station for centralized control of D2D link transmission scheduling;
the base station completes direct information transmission among devices through a signaling centralized control link, and the initialization system parameters of the D2D wireless communication system controlled by the base station in a centralized manner include: the equipment sends the transmission power P and the signal-to-interference-and-noise-ratio decoding threshold value beta of the equipment to the number N, D2DiWhere i denotes the ith link, the initial time slot k is 1, and the initial instantaneous information age a of each linki(k)，k＝1。
8. The system of claim 6, wherein the module M2 for the D2D transceiver device to send the status information of the current time slot to the base station comprises: transmission state b of the receiving device in the last time slot k-1i(k-1) wherein bi(k-1) ═ 1 indicates that information is updated, bi(k-1) ═ 0 indicates that the information has not been updated; position information of receiver and transmitter for each link
Figure FDA0003490243340000031
Figure FDA0003490243340000032
Wherein the content of the first and second substances,
Figure FDA0003490243340000033
two-dimensional spatial coordinates representing the transmitter and receiver, respectively, are obtained by a global satellite navigation system.
9. The system according to claim 6, wherein said module M3 stores the instantaneous message age A of each link using the last time sloti(k-1) and received transmission status bi(k-1) calculating the instantaneous information age A of each link in the current time sloti(k)＝Ai(k-1)[1-bi(k-1)]+ 1; the base station calculates the transmission success probability of each link, the transmission success probability mu of the link i in the current time slot ki(k) The calculation formula is as follows:
Figure FDA0003490243340000034
wherein
Figure FDA0003490243340000035
Figure FDA0003490243340000036
xi(k) Indicating the link activation decision, x, made by the base station on link i at time slot ki(k) Transmission is represented by 1, xi(k) 0 means no transmission, xj(k) Represents the link activation decision h made by the base station on link j in time slot kjiRepresents the small scale fading, h, between the transmitter of link j and the receiver of link iiiRepresents the small-scale fading between the transmitter of link i and the receiver of link i, alpha represents the path loss exponent, ρiIndicating that the probability of success of the transmission is affected by environmental noise, DjiIndicating that the probability of success of the transmission of link i is affected by the interference of the transmitter of link j, djiRepresents the distance between the transmitter of link j and the receiver of link i, diiRepresents the distance between the transmitter of link i and the receiver of link i; sigma2Representing additive white gaussian noise in the environment; D2D transmitting equipment transmitting power P, signal interference noise ratio decoding threshold value betai(ii) a The base station calculates the expected information age E [ A ] of the next time sloti(k+1)]The calculation formula is as follows:
Figure FDA0003490243340000041
Figure FDA0003490243340000042
10. the system according to claim 6, wherein the base station in the module M4 solves the decision x about link activationi(k) The integer programming problem of (2), said integer programming problem being as follows:
Figure FDA0003490243340000043
Figure FDA0003490243340000044
obtaining a solution of the integer programming problem by calculation
Figure FDA0003490243340000045
And N, the number of the equipment pairs.
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