Wireless communication system, wireless communication method, wireless communication control device, and wireless communication program

Abstract

This disclosure relates to a radio communication system, a radio communication method, a radio communication control device, and a radio communication program. This radio communication system comprises a plurality of base stations, a terminal, and a toll center. The terminal is configured to perform a process of calculating required radio quality. The base stations are configured to perform a first calculation process of calculating power consumption caused by radio waves to be transmitted, a second calculation process of calculating power consumption caused by an analog circuit, and a third calculation process of calculating power consumption caused by digital signal processing. The toll station is configured to perform: a selection process of selecting candidates for the combination of an accommodation base station and a communication scheme; a fourth calculation process of calculating, for each of the candidates for the combination, the total power consumption of the entirety of a network from the results of the first, second, and third calculation processes; a recording process of recording the result of the fourth calculation process for every candidate for the combination; a selection process of selecting a combination that achieves the lowest power consumption for the entirety of the network according to the result of the recording process; and a process of performing radio communication using the selected combination.

Description

[Technical Field]

[0001] The present disclosure relates to a wireless communication system, a wireless communication method, a wireless communication control device, and a wireless communication program. [Background technology]

[0002] Wireless communication systems with multiple base stations require technologies that can achieve power savings. One such technology is to optimize power consumption through user-centered base station clustering. This technology clusters multiple base stations near user terminals and performs cooperative transmission, optimizing frequency utilization efficiency and power consumption by transmitted radio waves. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] HAAmmar, et al., "User-centric cell-free massive MIMO networks: A survey of opportunities, challenges and solutions," IEEE Commun. surveys & tutorials, Vol 24, No. 1, First quarter 2022. [Non-patent document 2] W. Nie, et al., "User-centric cross-tier base station clustering and cooperation in heterogeneous networks: Rate improvement and energy saving," IEEE JSAC, Vol 34, No. 5, May 2016. Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned technology does not take into account the power consumption of the entire network, i.e., it only takes into account the power consumption of the transmitted radio waves, and does not take into account the power consumption of analog circuits and digital signal processing, such as heat energy.

[0005] Furthermore, the above-mentioned technology cannot consider optimal values ​​that depend on parameters that change over time, i.e., it is not possible to consider optimal values ​​for parameters that change in real time, such as whether or not a terminal is moving, the communication distance, or the results of user clustering.

[0006] In order to solve the above-mentioned problems, a first object of the present disclosure is to provide a wireless communication system that can reduce power consumption for the entire network including multiple base stations.

[0007] A second object of the present disclosure is to provide a wireless communication method that can reduce power consumption over an entire network including multiple base stations.

[0008] A third object of the present disclosure is to provide a radio communication control device that can reduce power consumption over an entire network including a plurality of base stations.

[0009] A fourth object of the present disclosure is to provide a wireless communication program that can reduce power consumption across an entire network including multiple base stations. [Means for solving the problem]

[0010] A first aspect of the present disclosure is preferably a wireless communication system including a plurality of base stations, a terminal, and a central station, wherein the terminal is configured to perform a process of calculating a required wireless quality, the base stations are configured to perform a first calculation process of calculating power consumption by transmitted radio waves, a second calculation process of calculating power consumption by analog circuits, and a third calculation process of calculating power consumption by digital signal processing, and the central station is configured to perform a selection process of selecting candidate combinations of accommodating base stations and communication methods, a fourth calculation process of calculating, for each candidate combination, the total power consumption of the entire network from the results of the first, second, and third calculation processes, a recording process of recording the results of the fourth calculation process for all candidate combinations, a selection process of selecting a combination that will result in the lowest power consumption of the entire network from the results of the recording process, and a process of performing wireless communication using the selected combination.

[0011] A second aspect of the present disclosure is preferably a wireless communication method performed by a wireless communication system including a plurality of base stations, a terminal, and a central station, the wireless communication method including: a step of calculating a required wireless quality; a step of selecting candidate combinations of accommodating base stations and communication methods; a first calculation step of calculating power consumption by transmitted radio waves for all candidate combinations; a second calculation step of calculating power consumption by analog circuits; a third calculation step of calculating power consumption by digital signal processing; a fourth calculation step of calculating the sum of power consumption of the entire network from the results of the first, second, and third calculation steps; a recording step of recording the results of the fourth calculation process for all candidate combinations; a step of selecting a combination that results in the lowest power consumption of the entire network from the results of the recording step; and a step of performing wireless communication using the selected combination.

[0012] A third aspect of the present disclosure is preferably a wireless communication control device that controls a wireless communication system having a plurality of base stations and terminals, and is configured to perform a selection process to select candidate combinations of accommodating base stations and communication methods, a calculation process to calculate the total power consumption of the entire network calculated by the accommodating base stations for all candidate combinations, a recording process to record the results of the calculation process for all candidate combinations, a process to select a combination that will result in the lowest power consumption of the entire network from the results of the recording process, and a process to perform wireless communication using the selected combination.

[0013] A fourth aspect of the present disclosure is preferably a wireless communication program to be executed by an arithmetic processor of a wireless communication control device that controls a wireless communication system having a plurality of base stations and terminals, the wireless communication program causing the wireless communication control device to perform a selection process for selecting candidate combinations of accommodating base stations and communication methods, a calculation process for calculating the total power consumption of the entire network for each candidate combination, a recording process for recording the results of the calculation process for all candidate combinations, a selection process for selecting the combination that will result in the lowest power consumption of the entire network from the results of the recording process, and a process for performing wireless communication using the selected combination. [Effects of the Invention]

[0014] According to the first to fourth aspects of the present disclosure, it is possible to reduce power consumption in an entire network including a plurality of base stations. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a diagram illustrating a wireless communication system according to a first embodiment of the present disclosure. [Figure 2] 1 is a functional block diagram of a wireless communication device according to a first embodiment of the present disclosure. [Figure 3] 10 is a flowchart showing a process of determining a combination of an accommodating base station and a communication scheme according to the first embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0016] Embodiment 1 1 is a diagram illustrating a wireless communication system according to a first embodiment of the present disclosure. The wireless communication system 100 includes multiple base stations 2a and 2b. The base station 2a is, for example, a base station having an omni-antenna. The base station 2b is, for example, a base station that uses mMIMO (massive multiple input multiple output).

[0017] The wireless communication system 100 also includes a plurality of terminals 4. The terminals 4 may be terminals having omni-antennas or terminals that use mMIMO.

[0018] Furthermore, wireless communication system 100 includes a toll station 6. Toll station 6 controls wireless communication system 100 based on information collected from terminals. Specifically, to optimize power consumption throughout the network, toll station 6 selects a combination of an accommodating base station and a communication method based on the calculation results of the power consumption of transmitted radio waves, analog circuits, and digital signal processing.

[0019] Here, the power consumption due to transmitted radio waves refers to, for example, the energy due to radio wave emission. Furthermore, the power consumption due to analog circuits refers to, for example, the thermal energy that can be estimated from the operating state of an amplifier. Here, the operating state of an amplifier can be estimated from, for example, the back-off value of the amplifier. Furthermore, the power consumption due to digital signal processing refers to, for example, the thermal energy consumed by calculation processing.

[0020] The toll center 6 first selects candidate combinations of accommodating base stations and communication methods. This selection is based on wireless quality information assumed by each terminal. The wireless quality information is also estimated based on location information and moving speed information collected by each terminal. This selection is based on the assumption that each base station and terminal meet the required throughput.

[0021] Based on each candidate combination of accommodating base station and communication method, the power consumption for transmitted radio waves, analog circuits, and digital signal processing at the corresponding base station 2 is calculated. By comparing the results of these calculations, the central station 6 determines the combination of accommodating base station and communication method that will minimize power consumption. Note that base stations not selected here are put to sleep to reduce power consumption throughout the network.

[0022] 2 is a functional block diagram of a wireless communication device according to the first embodiment of the present disclosure. Here, transmission and reception of information when central station 6 determines a control method for wireless communication system 100 based on information collected from terminal 4 will be described.

[0023] First, the flow of information transmission from terminal 4 to central station 6 will be described. Terminal 4 includes a location information and movement speed calculation unit 10. Location information and movement speed calculation unit 10 calculates the location information and movement speed of terminal 4 and inputs them to digital modulation processing unit 12. Terminal 4 also includes a wireless communication quality estimator 18. Wireless communication quality estimator 18 estimates the wireless communication quality of terminal 4 and inputs it to digital modulation processing unit 12.

[0024] The digital modulation processing unit 12 processes the received signal by digital modulation and transmits it to the digital-to-analog conversion unit 14. The digital-to-analog conversion unit 14 converts the digitally modulated signal into an analog signal and transmits it to the analog circuit unit 16. The analog circuit unit 16 performs processing such as amplification to transmit the signal as radio waves. The signal processed by the analog circuit unit 16 is transmitted from the antenna 20 to the antenna 22. In this way, information from the terminal 4 is transmitted to the base station 2.

[0025] The base station 2 includes a terminal information collection unit 24. The terminal information collection unit 24 collects information about each terminal and transmits it to the central control unit 38. In this manner, information is transmitted from the terminal 4 to the central station 6.

[0026] Next, we will explain the flow in which central station 6 selects candidate combinations of accommodating base stations and communication methods, and base station 2 calculates the power consumption for each candidate. Central station 6 includes centralized control unit 38. Centralized control unit 38 selects candidate combinations of accommodating base stations and communication methods based on information transmitted from terminal 4. Then, it transmits information about the candidates to base station parameter management unit 26.

[0027] The base station parameter management unit 26 records information related to candidate combinations of accommodating base stations and communication methods transmitted from the centralized control unit 38. The base station parameter management unit 26 manages parameters such as the transmission power and modulation method of the base station 2 based on the base station parameters input from the centralized control unit 38. This allows the base station 2 to calculate the power consumption for each candidate combination of accommodating base station and communication method recorded by the base station parameter management unit 26.

[0028] Finally, we will explain the flow in which the toll center 6 determines the combination of an accommodating base station and a communication method based on the power consumption calculated by the base station 2. First, we will explain the power consumption due to the transmitted radio waves. The base station 2 is equipped with a transmission power control unit 34. The transmission power control unit 34 has the function of specifying the signal power to be transmitted and transmitting it to the analog circuit unit 32. At the same time, the transmission power control unit 34 transmits information regarding radio wave emission to the power consumption calculation unit 36. The power consumption calculation unit 36 ​​calculates the power consumption due to the transmitted radio waves based on the received information.

[0029] Next, the power consumption by the analog circuit will be described. The base station 2 includes a digital modulation processing unit 28. The digital modulation processing unit 28 processes the transmission signal using digital modulation and transmits it to a digital-analog conversion unit 30. The digital-analog conversion unit 30 converts the digitally modulated signal into an analog signal. The signal is then transmitted to an analog circuit unit 32. The analog circuit unit 32 performs processing such as amplification in order to transmit radio waves from the antenna. The analog circuit unit 32 transmits information necessary for calculating power consumption to a power consumption calculation unit 36. The power consumption calculation unit 36 ​​calculates the power consumption by the analog circuit based on the received information.

[0030] Next, the power consumption due to digital signal processing will be described. The base station 2 has a digital modulation processing unit 28. As described above, the digital modulation processing unit 28 converts a digitally modulated signal into an analog signal. At the same time, the digital modulation processing unit 28 transmits information related to the digital signal processing to the power consumption calculation unit 36. The power consumption calculation unit 36 ​​calculates the power consumption due to the digital signal processing based on the received information.

[0031] The power consumption calculation unit 36 ​​calculates the power consumption of each component as described above, and then transmits information about the calculated power consumption to the central control unit 38.

[0032] The centralized control unit 38 calculates the power consumption of the entire network for each candidate combination of accommodating base station and communication method. That is, it calculates the total power consumption due to transmitted radio waves, analog circuits, and digital signal processing. It then records the calculated power consumption. This recording is performed for all candidate combinations of accommodating base station and communication method. It then compares the recorded power consumptions and selects the combination of accommodating base station and communication method that results in the lowest power consumption.

[0033] As described above, the combination of the accommodating base station and the communication method determined by the centralized control unit 38 is notified to the base station parameter management unit 26. By performing control in accordance with this notification, the wireless communication system 100 can reduce power consumption throughout the entire network.

[0034] The functions of the central station 6 of the present disclosure can also be realized by a computer and a program. This program can be recorded on a recording medium or provided via a network.

[0035] 3 is a flowchart showing a process for determining a combination of an accommodating base station and a communication method according to the first embodiment of the present disclosure. First, in step 100, a required wireless quality is calculated from main throughput information of each terminal. The required wireless quality is, for example, SINR. This process is performed by, for example, terminal 4.

[0036] Next, in step 102, candidates for the accommodating base station and the communication method are selected. This process is performed based on the required wireless quality, the location information of the terminal, and the moving speed. This process is also performed by the central station 6, for example.

[0037] Next, in step 104, one of the candidate combinations of accommodating base station and communication method is selected. Note that base stations not selected here are put to sleep to reduce power consumption across the network.

[0038] Steps 106 to 110 are steps for calculating the power consumption of each accommodating base station from the selected combination of accommodating base station and communication method. This process is performed by base station 2, for example.

[0039] First, in step 106, the power consumption due to the transmitted radio waves is calculated from the transmission power parameters. This power consumption due to the transmitted radio waves is the energy due to radio wave emission.

[0040] Next, in step 108, the power consumption by the analog circuit is calculated from the selected communication method and the back-off value of the amplifier. This power consumption by the analog circuit is thermal energy.

[0041] Then, in step 110, the power consumption due to digital signal processing is calculated from the selected communication method. This power consumption due to digital signal processing is thermal energy.

[0042] Next, in step 112, the total power consumption of the entire network is calculated. That is, the total is calculated based on the power consumption of transmitted radio waves, the power consumption of analog circuits, and the power consumption of digital signal processing calculated for each accommodating base station. This process is performed, for example, by the central station 6.

[0043] Next, in step 113, the calculation result of the power consumption is recorded. This process is carried out in the central station 6, for example.

[0044] Next, in step 114, it is confirmed whether all candidate combinations of accommodating base stations and communication methods have been considered. This process is performed, for example, by the central station 6. If all considerations have been completed, the process proceeds to step 118. If not, the process proceeds to step 116.

[0045] In step 116, the combination of the accommodating base station and communication method is changed to the next candidate, and the process returns to step 104. This makes it possible to calculate the power consumption of the entire network for all the candidates selected in step 102. This process is performed in the central station 6, for example.

[0046] Steps 118 Then, the combination of accommodating base station and communication method that will result in the lowest power consumption is selected. That is, the power consumption calculated up to that point is compared for all candidate combinations of accommodating base station and communication method, and the most appropriate candidate is selected. This process is performed, for example, by the central station 6. Note that base stations not selected here can be put to sleep to reduce power consumption throughout the network.

[0047] By performing processing according to this flowchart, it is possible to select a candidate combination of an accommodating base station and a communication method that will result in the lowest power consumption for the entire network. [Explanation of symbols]

[0048] 2, 2a, 2b base station 4. Terminal 6 Central station 100 Wireless Communication System

Claims

1. A wireless communication system comprising a plurality of base stations, terminals, and a central station, The terminal is configured to perform a process for calculating a required wireless quality; The base station a first calculation process for calculating power consumption due to the transmitted radio waves; a second calculation process for calculating the power consumption of the analog circuit; a third calculation process for calculating power consumption due to digital signal processing; configured to: The central station: a selection process for selecting candidates for combinations of accommodating base stations and communication methods; a fourth calculation process of calculating a total sum of power consumption of the entire network from results of the first, second, and third calculation processes for each of the candidate combinations; a recording process of recording the results of the fourth calculation process for all of the combination candidates; a selection process for selecting the combination that minimizes power consumption of the entire network from the result of the recording process; a process of performing wireless communication using the selected combination; configured to Wireless communication system.

2. 2. The wireless communication system according to claim 1, wherein said central station is configured to perform a process of putting base stations that were not selected in said selection process to sleep.

3. The wireless communication system according to claim 1 , wherein the selection process includes a process of determining the candidate combinations based on the required wireless quality, location information and moving speed of the terminals.

4. 2. The wireless communication system according to claim 1, wherein the power consumption of the analog circuit is thermal energy that can be estimated from the communication method and the operating state of an amplifier.

5. The wireless communication system according to claim 1 , wherein the power consumption due to the digital signal processing is thermal energy that can be estimated from the communication method.

6. A wireless communication method performed by a wireless communication system including a plurality of base stations, a terminal, and a central station, comprising: calculating a required wireless quality; selecting candidates for combinations of accommodating base stations and communication methods; For all the candidate combinations, a first calculation step of calculating power consumption by the transmitted radio wave; a second calculation step of calculating the power consumption of the analog circuit; a third calculation step of calculating power consumption due to digital signal processing; a fourth calculation step of calculating a total sum of power consumption of the entire network from the results of the first, second, and third calculation steps; a recording step of recording the results of the fourth calculation step for all of the combination candidates; selecting the combination that minimizes power consumption of the entire network based on the result of the recording step; performing wireless communication using the selected combination; A wireless communication method comprising:

7. A wireless communication control device that controls a wireless communication system including a plurality of base stations and terminals, a selection process for selecting candidates for combinations of accommodating base stations and communication methods; a calculation process of calculating a total sum of power consumption of the entire network calculated by the accommodating base station for all of the candidate combinations; a recording process of recording the results of the calculation process for all the combination candidates; a process of selecting the combination that will result in the lowest power consumption of the entire network based on the result of the recording process; a process of performing wireless communication using the selected combination; A wireless communication control device configured to perform the following.

8. A wireless communication program executed by an arithmetic processor of a wireless communication control device that controls a wireless communication system including a plurality of base stations and terminals, The wireless communication control device a selection process for selecting candidates for combinations of accommodating base stations and communication methods; a calculation process of calculating a total power consumption of the entire network for each of the candidate combinations; a recording process of recording the results of the calculation process for all the combination candidates; a selection process for selecting the combination that minimizes power consumption of the entire network from the result of the recording process; a process of performing wireless communication using the selected combination; A wireless communication program for carrying out the above.

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