WO2024134833A1 - Système de communication sans fil, procédé de communication sans fil et dispositif terminal - Google Patents

Système de communication sans fil, procédé de communication sans fil et dispositif terminal Download PDF

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Publication number
WO2024134833A1
WO2024134833A1 PCT/JP2022/047385 JP2022047385W WO2024134833A1 WO 2024134833 A1 WO2024134833 A1 WO 2024134833A1 JP 2022047385 W JP2022047385 W JP 2022047385W WO 2024134833 A1 WO2024134833 A1 WO 2024134833A1
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communication
terminal devices
observation information
cost calculation
base station
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PCT/JP2022/047385
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English (en)
Japanese (ja)
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淳 増野
知哉 景山
理一 工藤
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日本電信電話株式会社
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Priority to PCT/JP2022/047385 priority Critical patent/WO2024134833A1/fr
Publication of WO2024134833A1 publication Critical patent/WO2024134833A1/fr

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  • the present invention relates to a wireless communication system, a wireless communication method, and a terminal device.
  • Non-Patent Document 1 proposes improving coverage and throughput by relaying transmission by terminal devices. It is expected that path diversity or gain can be obtained through cooperative wireless transmission by multiple terminal devices, improving communication performance compared to communication by a single terminal device alone.
  • Non-Patent Document 2 analyzes the effects of selecting cooperative terminals, but does not mention the network configuration or specific means required for selecting cooperative terminals as a wireless communication system. It will also be necessary to select cooperative terminals that take into account terminal devices with different capabilities and different states. As such, in the past, there was a problem in that there was no means to select cooperative terminals with high transmission performance per unit of power consumption.
  • the present invention aims to provide technology that can select cooperative terminals with high transmission performance per unit of power consumption.
  • One aspect of the present invention is a wireless communication system comprising a plurality of terminal devices and a base station device in a wireless access network that performs wireless communication between the plurality of terminal devices, the plurality of terminal devices acquiring observation information for communication cost calculation of other terminal devices belonging to the group by sharing observation information for communication cost calculation between the plurality of terminal devices belonging to a group that is set in advance or dynamically, and a cost calculation unit that calculates communication costs based on the acquired observation information for communication cost calculation and the observation information of the terminal device itself, and a wireless access network communication unit that determines whether to communicate with the base station device using a method of independent communication or cooperative communication based on the communication cost calculated by the cost calculation unit, and communicates with the base station device using the determined method.
  • One aspect of the present invention is a wireless communication method in a wireless communication system including a plurality of terminal devices and a base station device in a wireless access network that performs wireless communication between the plurality of terminal devices, in which the plurality of terminal devices share observation information for calculating communication costs among the plurality of terminal devices that belong to a group that is set in advance or dynamically, thereby acquiring observation information for calculating the communication costs of other terminal devices that belong to the group, calculating communication costs based on the acquired observation information for calculating communication costs and the observation information of the terminal device itself, determining whether to communicate with the base station device using a method of independent communication or cooperative communication based on the calculated communication cost, and communicating with the base station device using the determined method.
  • One aspect of the present invention is a terminal device that includes: a cost calculation unit that acquires observation information for communication cost calculation of other terminal devices belonging to the group by sharing observation information for communication cost calculation between the multiple terminal devices belonging to a group that is set in advance or dynamically, and calculates communication costs based on the acquired observation information for communication cost calculation and the observation information of the terminal device itself; and a radio access network communication unit that determines whether to communicate with a base station device in a radio access network by a method of independent communication or cooperative communication based on the communication cost calculated by the cost calculation unit, and communicates with the base station device by the determined method.
  • This invention makes it possible to select cooperative terminals with high transmission performance per unit of power consumption.
  • FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system according to a first embodiment.
  • FIG. 2 is a diagram illustrating an example of the configuration of a terminal device according to the first embodiment.
  • FIG. 2 is a diagram illustrating a configuration example of a RAN transmitter in the first embodiment.
  • FIG. 2 is a diagram illustrating an example of the configuration of a RAN receiver according to the first embodiment.
  • 5 is a flowchart showing a flow of processing performed by a terminal device in the first embodiment.
  • FIG. 11 is a diagram illustrating an example of the configuration of a wireless communication system according to a second embodiment.
  • FIG. 13 is a diagram illustrating an example of the configuration of a terminal device according to a third embodiment.
  • FIG. 1 is a diagram showing an example of the configuration of a wireless communication system 100 according to the first embodiment.
  • the wireless communication system 100 includes a base station device 10 and a plurality of terminal devices 20.
  • Fig. 1 shows a configuration in which the wireless communication system 100 includes four terminal devices 20-1 to 20-4, but the number of terminal devices 20 may be any number as long as it is more than one.
  • the base station device 10 is a base station device in the RAN. Wireless communication is performed between the base station device 10 and multiple terminal devices 20 by independent communication or cooperative communication.
  • the multiple terminal devices 20 form a wireless PAN (Personal Area Network) network (NW (PAN) in FIG. 1).
  • a wireless PAN is a network made up of terminals located in close proximity, and is a low-power network compared to a RAN.
  • the network configuration of the multiple terminal devices 20 that make up the wireless PAN is a mesh topology. That is, the multiple terminal devices 20 form wireless PAN links between each of the terminal devices 20, and form a mesh-shaped wireless PAN network. In this way, in the first embodiment, the multiple terminal devices 20 form a wireless PAN with a mesh topology, and information is shared in a distributed manner.
  • the multiple terminal devices 20 that make up the wireless PAN will be described as a pre-defined group.
  • the PAN target may register a PAN MAC address that will accept connections in advance. For example, if there is a need to prevent others from using the battery, this can be prevented. Of course, other authentication methods may also be used.
  • the multiple terminal devices 20 that belong to a group share observation information for calculating communication costs.
  • the communication cost is an index that indicates communication performance relative to power consumption.
  • the observation information for calculating communication costs is information for calculating the communication cost related to communication between the terminal device 20 and the base station device 10, and examples of this include information that can be obtained by the terminal device 20 alone, information on the quality of the wireless channel, etc.
  • Information that can be acquired by the terminal device 20 alone includes, for example, remaining battery power, transmission capability (e.g., a link quality table including the number of antennas, bandwidth, frequency band, and transmission capacity per unit of power consumption), and the operating state of the terminal device 20 (e.g., whether it is in an active state or a sleep state).
  • Information on the wireless channel quality includes the communication performance in the RAN communication between the terminal devices 20, past throughput, communication success rate, and a channel quality indicator (CQI).
  • the observation information for calculating communication costs may include information such as an estimate from the observation information or location information such as GPS (Global Positioning System), and the result of determining the visibility of the RAN communication from camera images, etc.
  • the terminal device 20 acquires observation information for calculating communication costs of other terminal devices 20 belonging to the group (hereinafter referred to as "other terminal observation information") by sharing observation information for calculating communication costs between multiple terminal devices 20 belonging to the group, and calculates communication costs based on the acquired other terminal observation information and its own observation information. Based on the communication cost, the terminal device 20 determines whether to communicate with the base station device 10 using a method of independent communication or cooperative communication, and communicates with the base station device 10 using the determined method.
  • FIG. 2 is a diagram showing an example of the configuration of a terminal device 20 in the first embodiment.
  • the terminal device 20 includes a RAN communication unit 21, a PAN communication unit 22, a camera 23, a location information acquisition unit 24, a wireless quality observation unit 25, a shielding state determination unit 26, a terminal state observation unit 27, and a cost calculation unit 28.
  • the RAN communication unit 21 is a wireless interface for the RAN.
  • the RAN communication unit 21 is composed of a RAN antenna 211, a RAN receiver 212, a cooperative transmission control unit 213, and a RAN transmitter 214.
  • the RAN communication unit 21 is one aspect of a radio access network communication unit.
  • the RAN antenna 211 receives radio waves transmitted from the base station device 10 or other terminal devices 20, converts the received radio waves into electrical signals, and outputs them to the RAN receiver 212.
  • the RAN antenna 211 converts electrical signals output from the RAN transmitter 214 into radio waves and transmits them to the base station device 10.
  • the RAN receiver 212 acquires information on wireless quality based on the electrical signal output from the RAN antenna 211. For example, the RAN receiver 212 acquires information on wireless quality based on an electrical signal obtained by wireless communication with the base station device 10. For example, the RAN receiver 212 acquires information on wireless quality such as CQI, SINR (Signal to Interference Noise Ratio), throughput, and communication success rate.
  • CQI Cost to Interference Noise Ratio
  • SINR Signal to Interference Noise Ratio
  • the cooperative transmission control unit 213 determines whether to communicate with the base station device 10 by sole communication or cooperative communication based on the communication cost calculated by the cost calculation unit 28.
  • the cooperative transmission control unit 213 controls the operation of the RAN transmitter 214 according to the determined communication method. For example, when the cooperative transmission control unit 213 determines that communication with the base station device 10 should be by sole communication, it requests the RAN transmitter 214 to perform a procedure to transmit data to be transmitted that is stored in the transmission data buffer in the RAN transmitter 214. For example, when another terminal device 20 is the information source, the cooperative transmission control unit 213 waits for data from the other terminal device 20 to accumulate in the reception data buffer in the RAN receiver 212 before performing a procedure to hand the data over to the RAN transmitter 214.
  • the RAN transmitter 214 transmits the transmission data to the base station device 10 according to the control of the cooperative transmission control unit 213.
  • the PAN communication unit 22 is a wireless interface for the PAN.
  • the PAN communication unit 22 is composed of a PAN antenna 221, a PAN receiver 222, and a PAN transmitter 223.
  • the PAN antenna 221 receives radio waves transmitted from other terminal devices 20 (terminal devices 20 that constitute the PAN), converts the received radio waves into electrical signals, and outputs them to the PAN receiver 222.
  • the PAN antenna 221 converts electrical signals output from the PAN transmitter 223 into radio waves and transmits them to the other terminal devices 20.
  • the RAN antenna 211 and the PAN antenna 221 may be shared.
  • the camera 23 generates image data by capturing an image of the surroundings in which the terminal device 20 is installed.
  • the image data captures the surroundings in which the terminal device 20 is installed.
  • the camera 23 outputs the generated image data to the obstruction state determination unit 26.
  • the location information acquisition unit 24 acquires location information of the terminal device 20.
  • the location information acquisition unit 24 acquires location information by GPS.
  • the location information acquisition unit 24 may acquire location information by other methods as long as it is possible to acquire the location information of the terminal device 20.
  • the wireless quality observation unit 25 acquires information on wireless quality acquired by the RAN receiver 212.
  • the wireless quality observation unit 25 outputs the acquired information on wireless quality to the shielding state determination unit 26 and the cost calculation unit 28.
  • the obstruction state determination unit 26 determines whether the communication path between the base station device 10 is in a line of sight state or in a blocked state based on the image data output from the camera 23, the location information output from the location information acquisition unit 24, and the wireless quality information output from the wireless quality observation unit 25. The conditions for determining whether the communication path is line of sight or blocked in the obstruction state determination unit 26 are determined in advance. The obstruction state determination unit 26 outputs the determination result to the cost calculation unit 28.
  • the obstruction state determination unit 26 may determine obstruction based on image data when there is a building blocking communication on the path from the device's location to the base station device 10, or may determine line of sight when there is no building blocking communication on the path from the device's location to the base station device 10, or may determine obstruction when there is a low communication success rate even when there is no building blocking communication on the path from the device's location to the base station device 10. These determination conditions are merely examples.
  • the terminal state observation unit 27 observes the state of its own device. For example, the terminal state observation unit 27 observes the remaining battery level, transmission capacity, and operating state of the terminal device 20 as the state of its own device. The terminal state observation unit 27 outputs the observation results to the cost calculation unit 28.
  • the cost calculation unit 28 holds other terminal observation information output from the PAN communication unit 22, wireless quality information output from the wireless quality observation unit 25, the determination result output from the shielding state determination unit 26, and the observation result output from the terminal state observation unit 27.
  • the cost calculation unit 28 outputs the wireless quality information, the determination result, and the observation result to the PAN transmitter 223 as its own terminal observation information.
  • the observation information may be shared periodically, or may be triggered when the terminal device 20 detects a change in the observation information (for example, when the wireless quality observation unit 25 detects that the CQI fluctuation has exceeded a threshold).
  • the PAN configuration using a mesh topology is excellent at sharing observation information from other terminal devices 20 in real time, and is highly responsive to RAN transmission/reception triggers of the own device. Therefore, high efficiency can be expected if the number of cooperating terminals is small.
  • the cost calculation unit 28 calculates the communication cost based on the local terminal observation information and the other terminal observation information.
  • the cost calculation unit 28 outputs the calculated communication cost to the cooperative transmission control unit 213 as cost information.
  • FIG. 3 is a diagram showing an example of the configuration of the RAN transmitter 214 in the first embodiment.
  • the RAN transmitter 214 includes a data transfer unit 2141, a buffer 2142, a CRC encoder 2143, a channel encoder 2144, a modulator 2145, and an amplifier 2146.
  • the data transfer unit 2141 transfers the data to be transmitted, received from the cooperative transmission control unit 213, to the buffer 2142.
  • the buffer 2142 stores the data to be sent that is transferred from the data transfer unit 2141.
  • the CRC encoder 2143 sequentially reads the data to be transmitted that is stored in the buffer 2142, and encodes the data by adding an error detection code to the data to be transmitted.
  • the CRC encoder 2143 outputs the encoded data to be transmitted to the channel encoder 2144.
  • the communication channel encoder 2144 performs encoding according to the communication channel on the encoded data to be transmitted output from the CRC encoder 2143.
  • the communication channel encoder 2144 outputs the encoded data to be transmitted to the modulator 2145.
  • the modulator 2145 modulates the encoded data to be transmitted output from the channel encoder 2144.
  • the modulator 2145 outputs the modulated data to be transmitted to the amplifier 2146.
  • the amplifier 2146 amplifies the modulated data to be transmitted output from the modulator 2145.
  • the amplifier 2146 outputs the amplified data to be transmitted to the RAN antenna 211.
  • FIG. 4 is a diagram showing an example of the configuration of the RAN receiver 212 in the first embodiment.
  • the RAN receiver 212 includes an LNA 2121, a demodulator 2122, an MSE 2123, a channel decoder 2124, a CRC decoder 2125, a buffer 2126, and a data transfer unit 2127.
  • the LNA 2121 is a low noise amplifier that amplifies the electrical signal output from the RAN antenna 211.
  • the LNA 2121 outputs the amplified electrical signal to the demodulator 2122.
  • the demodulator 2122 demodulates the amplified electrical signal output from the LNA 2121.
  • the demodulator 2122 outputs the demodulated electrical signal to the MSE 2123 and the channel decoder 2124.
  • the demodulator 2122 obtains the CQI by demodulating the electrical signal.
  • the demodulator 2122 outputs the obtained CQI information to the wireless quality observation unit 25.
  • the MSE 2123 calculates the mean square error of the demodulated electrical signal output from the demodulator 2122, and obtains the SINR based on the calculated mean square error. Specifically, the MSE 2123 estimates the SINR from the error power (MSE: Mean Square Error) with adjacent signal points obtained by the demodulator 2122. The MSE 2123 outputs the obtained SINR information to the wireless quality observation unit 25.
  • MSE Mean Square Error
  • the communication channel decoder 2124 performs decoding according to the communication channel on the demodulated electrical signal output from the demodulator 2122.
  • the communication channel decoder 2124 outputs the decoded electrical signal to the CRC decoder 2125.
  • the CRC decoder 2125 restores the data to be transmitted by performing error detection decoding on the decoded electrical signal output from the channel decoder 2124.
  • the CRC decoder 2125 outputs the restored data to be transmitted to the buffer 2126.
  • Information on the probability of communication success or throughput obtained by CRC (Cyclic Redundancy Check) decoding by the CRC decoder 2125 or error detection during channel decoding by the channel decoder 2124 is output to the wireless quality observation unit 25.
  • the buffer 2126 stores the data to be transmitted that is output from the CRC decoder 2125.
  • the data transfer unit 2127 transfers the data to be transmitted that is stored in the buffer 2126 to the cooperative transmission control unit 213.
  • FIG. 5 is a flowchart showing the flow of processing performed by the terminal device 20 in the first embodiment.
  • the cost calculation unit 28 acquires its own terminal observation information (step S101). Specifically, the cost calculation unit 28 acquires the wireless quality information output from the wireless quality observation unit 25, the determination result output from the shielding state determination unit 26, and the observation result output from the terminal state observation unit 27. Furthermore, the cost calculation unit 28 acquires other terminal observation information received by the PAN communication unit 22 (step S102).
  • the cost calculation unit 28 calculates the communication cost based on the own terminal observation information and the other terminal observation information (step S103). Specifically, assuming that the observation information for the i-th terminal device 20 is the required power consumption P(i) for throughput, the achieved throughput T(i) for SINR, the observed SINR is SINR(i), the battery remaining rate B(i), the shielding state is S(i) (for example, a step function of 1 for line of sight and 10 for shielding), and the usage flag f(i) (for example, a step function of 1 for use (active) and 100 for non-use (sleep)), the cost function for each user for uplink transmission is defined as the following formula (1), for example.
  • the cost calculation unit 28 calculates the communication cost based on the above formula (1).
  • the cost calculation unit 28 outputs the calculation result to the cooperative transmission control unit 213 as cost information.
  • the above-mentioned cost function is an example and is not limiting.
  • the RAN downlink can be considered in the same way, with only the various characteristics related to the observation information (P(i), T(i), etc.) changing, but it is also acceptable for different terminal devices 20 to be selected as collaboration targets for the RAN uplink or downlink due to differences in the characteristics.
  • the cooperative transmission control unit 213 controls to establish RAN communication with the terminal device 20 to be coordinated.
  • the first method is to have the RAN communication unit 21 form a RAN link with the terminal device 20 to be coordinated.
  • the second method is to use the PAN to assist in advance the negotiation with the terminal device 20 to be coordinated, which leads to the formation of a RAN link with the terminal device 20 to be coordinated.
  • the cooperative transmission control unit 213 instructs the PAN communication unit 22 to share RAN information.
  • the cooperative transmission control unit 213 controls the RAN transmitter 214 to transmit the data to be transmitted together with the terminal device 20 that is performing cooperative communication (step S106).
  • the cooperative transmission control unit 213 determines that cooperative communication is not to be performed (step S104-NO)
  • it requests the RAN transmitter 214 to transmit the data to be transmitted that is stored in the transmission data buffer within the RAN transmitter 214.
  • the RAN transmitter 214 transmits the data to be transmitted that is stored in the transmission data buffer to the base station device 10 (step S107).
  • the multiple terminal devices 20 share observation information for calculating communication costs among multiple terminal devices 20 belonging to a preset group, thereby acquiring other terminal observation information
  • the cost calculation unit 28 calculates the communication cost based on the acquired other terminal observation information and the terminal observation information
  • the RAN communication unit 21 determines whether to communicate with the base station device 10 by sole communication or cooperative communication based on the communication cost, and communicates with the base station device 10 by the determined method.
  • the terminal device 20 selects a combination of terminal devices 20 that minimizes the total communication cost or is less than a threshold, and cooperates with the selected combination of terminal devices 20 to perform wireless transmission with the base station device 10. This makes it possible to select cooperative terminals with high transmission performance per power consumption.
  • FIG. 6 is a diagram showing a configuration example of a wireless communication system 100a in the second embodiment.
  • the wireless communication system 100a includes a base station device 10 and a plurality of terminal devices 20.
  • the configuration of the terminal device 20 and the operation by cost calculation are the same as those in the first embodiment.
  • the network form of the plurality of terminal devices 20 constituting the wireless PAN is a star topology.
  • the plurality of terminal devices 20 are divided into a master terminal device 20 and a slave terminal device 20 belonging to the master terminal device 20 on the PAN network topology, constituting a wireless PAN of a star topology.
  • the plurality of terminal devices 20 since the plurality of terminal devices 20 constitute a wireless PAN of a star topology, information is shared in a centralized manner.
  • the multiple terminal devices 20 that make up the wireless PAN will be described as being a pre-defined group.
  • a master terminal device 20 e.g., terminal device 20-1
  • the terminal devices 20 other than the master are simultaneously connected to the PAN in a star topology with at least the master terminal device 20 as one apex.
  • the terminal device 20 that serves as the master collectively manages the other terminal observation information.
  • the terminal devices 20 other than the master need the other terminal observation information, they request it from the terminal device 20 that serves as the master. This allows the terminal devices 20 other than the master to obtain the other terminal observation information.
  • this method is used by multiple terminal devices 20 that belong to a group to share observation information for communication cost calculations.
  • the wireless communication system 100a configured as described above can achieve the same effects as the first embodiment.
  • wireless links in the PAN are aggregated using a star-type network topology. Therefore, high efficiency is expected when the number of terminal devices 20 becomes large.
  • the terminal devices constituting the wireless PAN are a preset group.
  • a configuration will be described in which the terminal devices constituting the wireless PAN are dynamically changed.
  • the system configuration in the third embodiment is the same as that in the first or second embodiment. Therefore, in the third embodiment, multiple terminal devices may form a wireless PAN with a mesh topology or a wireless PAN with a star topology.
  • At least one of the multiple terminal devices 20 has the authority to determine which terminal devices will join the wireless PAN.
  • the authorized terminal device 20 decides whether to approve or deny a connection request from any terminal device requesting participation in the wireless PAN. If approved by the authorized terminal device 20, the terminal device that sent the connection request to the wireless PAN can participate in the wireless PAN. On the other hand, if denied by the authorized terminal device 20, the terminal device that sent the connection request to the wireless PAN cannot participate in the wireless PAN.
  • any terminal device requesting a connection to a PAN adds location information obtained by GPS or the like and information on the base station beam index for the RAN in beam-type communication often used in high-frequency band RAN to the observation information, and provides it to an authorized terminal device 20.
  • the authorized terminal device 20 dynamically determines the terminal devices to join the group so that the positions of the terminal devices belonging to the group are close to each other, based on the location information included in the provided observation information (other terminal observation information) and the base station beam index. In this way, the authorized terminal device 20 dynamically determines so that a group of nearby terminal devices 20 are aggregated into the PAN.
  • the period during which the decision is made to connect to the wireless PAN may be provisionally approved.
  • the authorized terminal device 20 acquires other terminal observation information of the terminal device 20 that sent the connection request.
  • the PAN reception process is one process of negotiation carried out via the PAN communication unit between the authorized terminal device 20 and the terminal device 20 that sent the connection request.
  • the master terminal device 20 and the authorized terminal device 20 may be different terminal devices 20 or may be the same terminal device 20.
  • FIG. 7 is a diagram showing an example of the configuration of a terminal device 20b in the third embodiment.
  • the terminal device 20b includes a RAN communication unit 21, a PAN communication unit 22, a camera 23, a location information acquisition unit 24b, a wireless quality observation unit 25b, a shielding state determination unit 26, a terminal state observation unit 27, and a cost calculation unit 28b.
  • the terminal device 20b has a different configuration from the terminal device 20 in that it has a location information acquisition unit 24b, a wireless quality observation unit 25b, and a cost calculation unit 28b instead of the location information acquisition unit 24, the wireless quality observation unit 25, and the cost calculation unit 28.
  • the rest of the configuration of the terminal device 20b is the same as that of the terminal device 20. The following will mainly explain the differences.
  • the location information acquisition unit 24b acquires location information of the terminal device 20 (its own device).
  • the location information acquisition unit 24b outputs the acquired location information of the terminal device 20 to the shielding state determination unit 26 and the cost calculation unit 28b.
  • the wireless quality observation unit 25b acquires wireless quality information acquired by the RAN receiver 212.
  • the wireless quality observation unit 25b outputs the acquired wireless quality information to the shielding state determination unit 26 and the cost calculation unit 28b.
  • the wireless quality information acquired by the wireless quality observation unit 25b includes base station beam index information in addition to the wireless quality information shown in the first embodiment.
  • the base station beam index information included in the wireless quality information indicates the beam index with superior quality in transmission and reception of the terminal among the beams provided by the base station device 10 to which the terminal belongs in the RAN.
  • the beam index is the beam index of the beam with the maximum reception power.
  • the cost calculation unit 28b performs the same process as in the first or second embodiment. Furthermore, if the cost calculation unit 28b is an authorized terminal device 20, it determines the terminal device 20 that will join the wireless PAN. Specifically, if there is a terminal device 20 that is requesting a new connection to the wireless PAN, the cost calculation unit 28b determines whether to approve or deny the request based on the location information included in the other terminal observation information obtained from the terminal device 20 that is requesting a new connection to the wireless PAN and the base station beam index information. For example, the cost calculation unit 28b permits (approves) participation in the group when a condition is met, such as the terminal devices belonging to the group being close to each other. On the other hand, the cost calculation unit 28b does not permit (denies) participation in the group when the condition is not met, such as the terminal devices belonging to the group being close to each other. It is assumed that the conditions are set in advance.
  • the terminal devices 20 that make up the PAN can be dynamically changed. Furthermore, the authorized terminal device 20 dynamically determines the groups that make up the PAN so that nearby terminal devices 20 are aggregated into the PAN. In this way, groups for sharing observation information are formed over a small range, rather than a wide range. This makes it possible to share information with little power.
  • the above-mentioned terminal device 20 may be realized by a computer.
  • a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize the function.
  • computer system here includes hardware such as the OS and peripheral devices.
  • computer-readable recording medium refers to portable media such as flexible disks, optical magnetic disks, ROMs, CD-ROMs, and storage devices such as hard disks built into computer systems.
  • “computer-readable recording medium” may include something that dynamically holds a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, or something that holds a program for a fixed period of time, such as volatile memory within a computer system that serves as a server or client in that case.
  • the above program may be one that realizes part of the functions described above, or may be one that can realize the functions described above in combination with a program already recorded in the computer system, or may be one that is realized using a programmable logic device such as an FPGA (Field Programmable Gate Array).
  • This invention can be applied to wireless access networks.

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Abstract

L'invention concerne un système de communication sans fil comprenant une pluralité de dispositifs terminaux et un dispositif de station de base dans un réseau d'accès radio qui communique sans fil avec la pluralité de dispositifs terminaux, la pluralité de dispositifs terminaux comprenant : une unité de calcul de coût qui, en partageant des informations d'observation pour un calcul de coût de communication entre une pluralité de dispositifs terminaux appartenant à un groupe défini précédemment ou de manière dynamique, acquiert des informations d'observation pour un calcul de coût de communication d'un autre dispositif terminal appartenant au groupe, et sur la base des informations d'observation acquises pour un calcul de coût de communication, et des informations d'observation du dispositif lui-même, calcule un coût de communication; et une unité de communication de réseau d'accès radio qui, sur la base du coût de communication calculé par l'unité de calcul de coût, détermine s'il faut communiquer avec le dispositif de station de base par un procédé de communication individuel ou de communication coopérative, et communique avec le dispositif de station de base par le procédé déterminé.　
PCT/JP2022/047385 2022-12-22 2022-12-22 Système de communication sans fil, procédé de communication sans fil et dispositif terminal WO2024134833A1 (fr)

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