WO2016186266A1 - Procédé de commande de fonctionnement de station de base dans un système de communication sans fil - Google Patents

Procédé de commande de fonctionnement de station de base dans un système de communication sans fil Download PDF

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Publication number
WO2016186266A1
WO2016186266A1 PCT/KR2015/010781 KR2015010781W WO2016186266A1 WO 2016186266 A1 WO2016186266 A1 WO 2016186266A1 KR 2015010781 W KR2015010781 W KR 2015010781W WO 2016186266 A1 WO2016186266 A1 WO 2016186266A1
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Prior art keywords
base station
reliability information
user terminal
base stations
transmission power
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PCT/KR2015/010781
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English (en)
Korean (ko)
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손일수
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가천대학교 산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a base station operation control method capable of minimizing the consumption of overall network energy (eg, transmission power) of a wireless communication system including a plurality of base stations.
  • overall network energy eg, transmission power
  • Transmission power control methods in a wireless communication system include an optimal central control method, a suboptimal central control method and a distributed control method.
  • the optimal central control method is a method of selecting the most optimal transmission power by investigating the number of all cases assuming that there is an ideal central controller in the system and knows all necessary radio channel and interference information.
  • Such a central control method has an advantage of producing optimal performance, but has a disadvantage in that an overhead of a control signal is large and an amount of computation for optimization increases exponentially as the system becomes large.
  • the sub-optimal central control method like the optimal central control method, assumes that there is an ideal central controller in the system and knows all necessary radio channel information. The decision is made sequentially.
  • the sub-optimal central control method has the advantage of lower computational complexity than the optimal central control method, but has a disadvantage of low control performance.
  • the distributed control method is a method in which the members of the system independently determine the transmission power, may be determined alone based on the surrounding environment information, or may be determined cooperatively by sharing certain information with the surrounding communication nodes.
  • This distributed control method has the advantage that the computational complexity is small because there is no separate control signal or can be minimized.However, the distributed control method has limited information and signal processing methods compared to the central control method. There is a disadvantage that the performance is much deteriorated.
  • the background technology of the present application is disclosed in Korean Unexamined Patent Publication No. 10-2010-0113262.
  • the present invention is to solve the above-mentioned problems of the prior art, distributed control of the base station operation that can exhibit the performance of the optimal overall network energy (transmission power) consumption with a small amount of operation compared to the base station operation control method of the conventional wireless communication system
  • a method and a base station apparatus for performing the method are provided.
  • the present application is to solve the above-described problems of the prior art, a plurality of base stations through a mutual exchange of network connection information (reliability information) through a distributed determination of the user terminal and base station connection without a central control unit
  • a distributed control method of a base station operation for minimizing network energy consumption and a base station apparatus for performing the method are provided.
  • a base station control method (a) each of the plurality of base stations is a first associated with the transmission power between each base station and at least one user terminal Receiving reliability information from an adjacent user terminal of each base station; (b) each base station receiving second reliability information relating to the number of active base stations from the plurality of base stations from other adjacent base stations of the respective base stations; (c) each base station generating third reliability information related to additional transmission power required by increasing the number of user terminals connected to each base station based on the first reliability information and the second reliability information. ; And (d) each base station transmitting the third reliability information to an adjacent user terminal of each base station.
  • the base station apparatus includes a communication unit and a processor, the processor, the first reliability associated with the transmission power between the base station apparatus and at least one user terminal Generating third reliability information related to additional transmission power required by increasing the number of user terminals connected to the base station apparatus based on the information and the second reliability information related to the number of active base stations among a plurality of base stations;
  • the communication unit may include receiving the first reliability information from an adjacent user terminal of the base station apparatus; Receiving the second reliability information from another adjacent base station of the base station apparatus; And transmitting the third reliability information to an adjacent user terminal of the base station apparatus.
  • the computer-readable recording medium having recorded thereon a program for executing a base station control method in a computer. May be provided.
  • the base station is the first reliability information related to the transmission power between the base station apparatus and at least one user terminal and a base station that is active among a plurality of base stations Generating third reliability information related to additional transmission power required by increasing the number of user terminals connected to the base station apparatus based on the second reliability information related to the number of times, and the communication unit generates the first reliability information.
  • any one of the problem solving means of the present invention described above by linking the network connection information (reliability information) cooperatively between a plurality of base stations and the user terminal without passing through the central control device, the user terminal and the base station connection by themselves Deterministic distribution allows optimal performance of the entire network energy consumption with a small amount of computation.
  • FIG. 1 is a block diagram showing a wireless communication system according to an embodiment of the present invention.
  • FIG. 2 is a conceptual diagram illustrating a state in which a plurality of base stations and user terminals exchange reliability information through functionally defined virtual nodes according to an embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating a base station control method of a wireless communication system according to an embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a base station control method of a wireless communication system according to another embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating a base station control method of a wireless communication system according to another embodiment of the present invention.
  • FIG. 6 is a block diagram illustrating a base station apparatus according to an embodiment of the present invention.
  • the present invention is a method and apparatus for optimizing by controlling the transmission power (transmit power), resources, etc. distributed to each member (node) without a separate central coordinator in a wireless communication system including a plurality of base stations It is about.
  • each member optimally corrects its transmission power, resources, etc. based on reliability information (message information) received from neighboring members, and checks whether its active state (on / off). Status) can be determined.
  • each member updates the message information received from the surrounding members to exchange the updated message information with the surrounding members again.
  • the present application continually repeats this process to induce the wireless communication system to reach an overall optimal state.
  • the present application is also applicable to wireless communication systems of all kinds / types.
  • the present application may be applied to cellular systems such as 3GPP-LTE, 4G LTE / LTE-A, 5G communication systems, wireless LAN systems, IoT systems, automotive communication systems, and the like.
  • FIG. 1 is a block diagram showing a wireless communication system according to an embodiment of the present invention.
  • the number of base stations and user terminals that are interconnected in a wireless communication system is not limited, and assuming a wireless communication system including three base stations and four user terminals with reference to FIG. 1, according to an embodiment of the present invention A method of controlling a base station of a wireless communication system will be described.
  • the wireless communication system 10 may include a first base station 110, a second base station 120, and a third base station 130. Further, the first user terminal 140, the second user terminal 150, the third user terminal 160, and the first base station 110, the second base station 120, and the third base station 130 around the perimeter. 4 user terminal 170 may be located.
  • Each user terminal 140,150,160,170 receives a reference signal from each of the base stations 110,120,130, and based on the received reference signal, channel information (eg, channel gain) of a network link with each base station 110, 120, 130 based on the received reference signal. (gain) and signal quality.
  • channel information eg, channel gain
  • gain gain
  • each of the user terminals 140, 150, 160, and 170 may generate first reliability information related to transmission power and channel information between each of the base stations 110, 120, 130, and each of the user terminals 140, 150, 160, 170, and transmit the same to the base stations 110, 120, 130.
  • the first reliability information is information related to the number of user terminals connected to each base station (110, 120, 130) and the transmission power required for network connection with the user terminal, and each user terminal (140,150,160,170) based on each user terminal (140,150,160,170). And information indicating a preference or probability value for activation of a connection between each base station (110, 120, 130).
  • the first reliability information may be generated by each user terminal based on reliability information (the seventh reliability information below) related to the probability that each user terminal 140, 150, 160, 170 is connected to any one of the plurality of base stations 110, 120, 130. .
  • Each of the base stations 110, 120, and 130 generates second reliability information related to the number of active base stations among the plurality of base stations included in the wireless communication system 10, and the other base stations 110, 120, and 130 adjacent to the generated second reliability information.
  • the second reliability information may be information representing a preference or probability value for activation of each of the base stations 110, 120, and 130, in consideration of the number of base stations operating in an activated state among the plurality of base stations and the power consumption of the entire wireless communication system.
  • each of the base stations 110, 120, and 130 may generate third reliability information based on the first reliability information received from the adjacent user terminals 140, 150, 160, and 170 and the second reliability information received from other adjacent base stations 110, 120, 130. have.
  • the third reliability information is information related to additional transmission power required by increasing the number of user terminals connected to each base station (110, 120, 130), and based on each base station (110, 120, 130), each user terminal (140, 150, 160, 170) and each base station (110, 120, 130) It may be information indicating a preference or probability value for activation of the connection between the liver.
  • each base station may transmit the third reliability information to each user terminal (140,150,160,170) adjacent to each base station.
  • Each of the user terminals 140, 150, 160, and 170 receiving the third reliability information from each of the base stations 110, 120, and 130 may update the first reliability information based on the third reliability information.
  • the first reliability information, the second reliability information, and the third reliability information may be calculated as probability values of 0 or more and 1 or less.
  • the first reliability information, the second reliability information, and the third reliability information may increase as a preference for connection between each base station 110, 120, 130 and each user terminal 140, 150, 160, 170 increases.
  • Increasing the preference for the connection between the base station and the user terminal may mean that when the connection between the base station and the user terminal is activated, the amount of reduction in total transmission power or consumption of network energy in the entire wireless communication system increases.
  • Each of the base stations 110, 120, and 130 receives fourth reliability information related to additional transmission power required by increasing the number of active base stations and the number of user terminals connected to each of the base stations 110, 120, and 130 of the plurality of base stations included in the wireless communication system. Can be generated.
  • the fourth reliability information is based on the number of user terminals connected to each of the base stations 110, 120, and 130, the number of base stations operating in an activated state among the plurality of base stations of the entire wireless communication system, and the amount of additional transmission power.
  • the base stations 110, 120, and 130 may exchange the generated fourth reliability information with other adjacent base stations 110, 120, and 130.
  • each base station (110, 120, 130) is to generate the fifth reliability information indicating the active state preference of each base station (110, 120, 130) based on the second reliability information and the fourth reliability information received from other adjacent base stations (110, 120, 130) Can be.
  • the fifth reliability information may be information indicating a preference or probability value for whether each of the base stations 110, 120, 130 becomes active according to an increase in the number of active base stations around each of the base stations 110, 120, 130.
  • each base station (110, 120, 130) is the first reliability information received from the adjacent user terminals (140, 150, 160, 170) and the sixth reliability information related to the additional transmission power required by increasing the number of user terminals connected to each base station (110, 120, 130) Can be generated.
  • the sixth reliability information may be information having a preference or probability value indicating an activation state of each base station (110, 120, 130).
  • the fourth reliability information, the fifth reliability information, and the sixth reliability information may have a value of 0 or more and 1 or less, and may increase as the preference for the activation state of each base station 110, 120, 130 increases.
  • Increasing the preference for the activation state of each base station (110, 120, 130) indicates the degree to which one base station preferably operates in an active state relative to other base stations, considering the amount of transmission power or network energy consumption of the entire wireless communication system. This may mean that the value is increased.
  • Each of the base stations 110, 120, and 130 may determine a base station operating in an active state among the plurality of base stations based on the generated fifth reliability information and sixth reliability information. Specifically, each base station (110, 120, 130) calculates the sum of the fifth reliability information and the sixth reliability information. In addition, each of the base stations 110, 120, and 130 decides to activate a base station having a sum of the fifth reliability information and the sixth reliability information greater than zero.
  • the first reliability information and the third reliability information may be generated for a one-to-one connection relationship between each base station (110, 120, 130) and each user terminal (140, 150, 160, 170) adjacent to each base station.
  • Each base station (110, 120, 130) calculates the sum of the first reliability information and the third reliability information with respect to the one-to-one connection relationship of each user terminal (140, 150, 160, 170) adjacent to each base station (110, 120, 130).
  • each base station (110, 120, 130) may determine to activate the connection between the base station and the user terminal having a value greater than zero sum of the first reliability information and the third reliability information.
  • each base station (110, 120, 130) generates the fifth reliability information and the sixth reliability information after the generation of the first reliability information to the fourth reliability information and the mutual exchange is repeated for a predetermined number of iterations, and accordingly A connection pair between the number of active base stations and the user terminal can be determined.
  • each of the base stations 110, 120, and 130 determines the base station in the activated state based on the sum of the first reliability information and the third reliability information, and the sum of the fifth reliability information and the sixth reliability information, and the base station determined to be in the activated state.
  • the number of may be determined to a value less than or equal to a predetermined number so that energy consumption of the entire wireless communication system is minimized.
  • the first base station 110, the second base station 120, and the third base station 130 are configured based on the fifth reliability information and the sixth reliability information. It is determined that keeping the base station 130 in an active state is optimal (shaded in FIG. 1).
  • the first base station 110, the second base station 120 and the third base station 130 is connected to the second base station 120 and the first user terminal 140 based on the first reliability information and the third reliability information. Connection between the second base station 120 and the second user terminal 150, the connection between the third base station 130 and the third user terminal 160, and the connection between the third base station 130 and the fourth user terminal 170. It may be determined that activating the connection is optimal.
  • Each base station (110, 120, 130) and each user terminal (140, 150, 160, 170) may repeatedly perform the generation and exchange of the first reliability information to sixth reliability information according to a predetermined period. As the period is shorter, the calculation amount at each base station 110, 120, 130 and each user terminal 140, 150, 160, 170 is increased, but the energy consumption of the wireless communication system can be minimized. In addition, the generation and the mutual exchange of the first reliability information to the sixth reliability information may be repeated until the number of active base stations having a minimum energy consumption and a user terminal connected thereto are determined.
  • the first reliability information, the second reliability information, the third reliability information, the fourth reliability information, the fifth reliability information, the sixth reliability information, and the seventh reliability information are the same.
  • i is the index of the base station A is an index of a user terminal ego
  • the seventh reliability information are related to each other, and each of the base stations 110, 120, 130, and the user terminals 140, 150, 160, and 170 repeatedly repeats the first reliability information, the second reliability information, the third reliability information, and the fourth reliability information.
  • the fifth reliability information, the sixth reliability information, and the seventh reliability information may be exchanged, and the information may be updated again based on the exchanged information.
  • each base station (110, 120, 130) and each user terminal (140, 150, 160, 170) by using a look up table (look up table), the first reliability information, the second reliability information, the third reliability information, the fourth The reliability information, the fifth reliability information, the sixth reliability information, and the seventh reliability information may be updated.
  • the lookup table sets each reliability information or some of the elements included in each reliability information as a variable, and includes values that can be considered for each variable and reliability information corrected according to each variable value in the form of a table. It can be said to be created.
  • FIG. 2 is a conceptual diagram illustrating a state in which a plurality of base stations and user terminals exchange reliability information through functionally defined virtual nodes according to an embodiment of the present invention.
  • FIG. 2 is a conceptual diagram schematically illustrating a relationship between base stations 110, 120, 130 and user terminals 140, 150, 160, and 170 intertwined with each other in a network.
  • the node shown in FIG. It can be called a virtual node (factor node, variable node) that defines the conditions and variables necessary to determine the connection relationship.
  • the first base station 110 includes the conditional virtual nodes 111 and 112 and the variable virtual node 113
  • the second base station 120 includes the conditional virtual nodes 121 and 122 and the variable virtual node 123
  • the third base station 130 includes the conditional virtual nodes 131 and 132 and the variable virtual node 133
  • the first user terminal 140 includes conditional virtual nodes 141, 142, 143, and 144 and variable virtual nodes 145, 146, and 147
  • the second user terminal 150 includes a conditional virtual node 151.
  • the third user terminal 160 includes conditional virtual nodes 161, 162, 163, and 164 and variable virtual nodes 165 and 166.
  • the fourth user terminal 170 may include conditional virtual nodes 171, 172, 173, and 174 and variable virtual nodes 175, 176, and 177.
  • the variable virtual node 201 may be included between the conditional virtual nodes 112 and 122
  • the variable virtual node 202 may be included between the conditional virtual nodes 122 and 132.
  • Conditional virtual nodes (111, 121, 131) Is a condition regarding the number of user terminals connected to the i-base station and the additional transmission power required at that time, and can be expressed by Equation 8 below.
  • Equation 8 is information indicating whether the i-base station and the a-user terminal are connected. Sum of and the number of user terminals connected to the i-base station. If is identical, then the required transmit power value is calculated, otherwise the result of infinity is calculated.
  • Conditional virtual nodes 112, 122, and 132 Regarding the constraint of the number of the active base station to the i-base station, it can be represented by the following equation (9).
  • Equation 9 calculates a value of 0 when the number of active base stations up to the (i-1) th base station plus 1 is equal to the number of active base stations up to the i th base station. Produces infinite results.
  • Conditional virtual nodes (144, 154, 164) Is a condition that one user terminal should be connected to one base station, and may be represented by Equation 10 below.
  • Equation 10 is information indicating whether the i-base station and the a-user terminal are connected to the user terminal a.
  • the value 0 is calculated only when the sum is 1, and the result of infinity is calculated otherwise.
  • Conditional virtual nodes (141, 142, 143, 151, 152, 153, 161, 162, 163, 171, 172, 173) Denotes a condition regarding transmission power required when the i-base station and the a-user terminal are connected.
  • variable virtual nodes 145, 146, 147, 155, 156, 157, 165, 166, 167, 175, 176, 177 are conditional virtual nodes 141, 142, 143, 151, 152, 153, 161.
  • the first reliability information may be generated and updated based on the information related to the probability of being connected to the first (7th reliability information) and transmitted to the conditional virtual nodes 111, 121, and 131.
  • the conditional virtual nodes 111, 121, and 131 transmit the third reliability information to the variable virtual nodes 145, 146, 147, 155, 156, 157, 165, 166, 167, 175, 176, and 177. Can be.
  • conditional virtual nodes 112, 122, and 132 and the variable virtual nodes 201, 202, and 203 may exchange the second reliability information and the fourth reliability information related to the number of active base stations among the plurality of base stations. Can be. Also, the conditional virtual nodes 112, 122, and 132 and the variable virtual nodes 113, 123, and 133 are fifth reliability information and sixth reliability related to the number of user terminals connected to each base station and the additional transmission power. Information can be exchanged.
  • the virtual nodes associated with each of the base stations 110, 120, 130 and the respective user terminals 140, 150, 160, 170 may be configured to have an activation state when the value of Equation 11 below is minimum through exchange of the first reliability information to the seventh reliability information.
  • a base station and a user terminal connected thereto may be determined.
  • Equation 11 becomes a negative infinity value, which is related to a condition that each virtual node means.
  • the base station in the activated state and the user terminal connected thereto may be determined.
  • FIG. 3 is a flowchart illustrating a base station control method of a wireless communication system according to an embodiment of the present invention.
  • the base station control method illustrated in FIG. 3 may be performed by the base station and the user terminal described above with reference to FIG. 1. Therefore, even if omitted below, the descriptions of the base station and the user terminal through FIG. 1 may be applied to FIG. 3.
  • each base station and each user terminal may set initial values of reliability information including first reliability information and third reliability information.
  • the initial value of each reliability information may be zero.
  • each base station may receive first reliability information related to transmission power between each base station and at least one user terminal from adjacent user terminals.
  • each base station may receive second reliability information related to the number of active base stations among the plurality of base stations from other adjacent base stations.
  • each base station adds additional transmission power required by increasing the number of user terminals connected to each base station based on the first reliability information received in step S310 and the second reliability information received in step S320. Relevant third reliability information may be generated.
  • each base station may transmit the third reliability information generated by the base station to adjacent user terminals.
  • the user terminal receives the third reliability information from an adjacent base station, and updates the first reliability information based on the third reliability information.
  • each base station may generate fourth reliability information related to additional transmission power required by increasing the number of active base stations among the plurality of base stations and the number of user terminals connected to each base station.
  • each base station may exchange the fourth reliability information with other neighboring base stations.
  • each base station may generate fifth reliability information indicating an active state preference of each base station based on the second reliability information received in step S330 and the fourth reliability information generated and received in step S350.
  • each base station may generate sixth reliability information related to additional transmission power required by increasing the first reliability information received in step S310 and the number of user terminals connected to each base station.
  • steps S310 to S360 may be repeatedly performed a predetermined number of times according to a preset period. For example, steps S310 to S360 may be repeatedly performed until a result value of at least some of the first reliability information to sixth reliability information converges to a predetermined value.
  • each base station determines a base station operating in an active state among a plurality of base stations based on the fifth reliability information and the sixth reliability information.
  • an activation connection relationship between an active base station and each user terminal may be determined.
  • the base station determined to be in an inactive state may transmit a handover command for establishing a connection with the base station determined to be active for the user terminal connected to the base station.
  • each base station and each user terminal repeatedly exchanges reliability information (reliability message) a predetermined number of times without a central controller or control device, thereby transmitting power or network energy of the entire wireless communication system. It is possible to establish a decentralized activation state to minimize the consumption of.
  • the present invention can save network energy, for example, by deactivating the operation of some base stations during off-peak times when excessive wireless traffic is not required.
  • FIG. 4 is a flowchart illustrating a base station control method of a wireless communication system according to another embodiment of the present invention.
  • the base station control method illustrated in FIG. 4 may be performed by the base station and the user terminal described above with reference to FIG. 1. Therefore, although omitted below, the descriptions of the base station and the user terminal through FIG. 1 may also be applied to FIG. 4.
  • each base station may generate and repeatedly update the fifth reliability information and the sixth reliability information as described above with reference to FIGS. 1 to 3. Further, in step S420, each base station may calculate the sum of the fifth reliability information and the sixth reliability information generated in step S410.
  • each base station may determine to activate a base station having a sum of the fifth reliability information and the sixth reliability information greater than zero. Further, in step S440, each base station calculates the sum of the first reliability information and the third reliability information received and updated as described above with reference to FIGS. 1 to 3. The first reliability information and the third reliability information are generated for a one-to-one connection relationship between each base station and each adjacent user terminal of each base station, and each base station is adjacent to each base station and each user terminal of each base station. The sum of the first reliability information and the third reliability information may be calculated with respect to the one-to-one connection relationship of.
  • each base station may determine to activate the connection between the base station and the user terminal having a value of the sum of the first reliability information and the third reliability information is greater than zero.
  • the first reliability information to the sixth reliability information may be calculated as a probability value having a value of 0 or more and 1 or less, and as described above with reference to FIG. 2, a request between each base station and each user terminal in a wireless communication system. If the condition is not satisfied, the value is infinite. Accordingly, the connection state between the base station and the base station and the user terminal in the case of having a finite value greater than zero rather than infinity in steps S430 and S450 may be activated.
  • FIG. 5 is a flowchart illustrating a base station control method of a wireless communication system according to another embodiment of the present invention.
  • the base station control method illustrated in FIG. 5 may be performed by the base station and the user terminal described above with reference to FIG. 1. Therefore, although omitted below, the descriptions of the base station and the user terminal through FIG. 1 may be applied to FIG. 5.
  • FIG. 5 a wireless communication system including two base stations 510 and 520 and two user terminals 530 and 540 will be described.
  • the base station closest to the first user terminal 530 is the first base station 510 and the base station closest to the second user terminal 540 is the second base station 520.
  • the base stations 510 and 520 may transmit information including a reference signal to the adjacent user terminals 530 and 540.
  • the first base station 510 periodically broadcasts a reference signal to the first user terminal 530 and the second user terminal 540, and the second base station 520 to the second user terminal 540.
  • the user terminals 530 and 540 measure signal quality based on the information received in step S501, and generally determine the base station located closest to and transmit the access request signal.
  • the first user terminal 530 may transmit a connection request signal to the first base station 510
  • the second user terminal 540 may transmit a connection request signal to the second base station 520.
  • the first base station 510 transmits an access permission command to the first user terminal 530, and thus a communication connection between the first user terminal 530 and the first base station 510 is established.
  • the second base station 520 transmits an access permission command to the second user terminal 540, and thus a communication connection between the second user terminal 540 and the second base station 520 is established.
  • the user terminals 530 and 540 may report the quality of the reference signal received from the adjacent base station to the connected base station.
  • the first user terminal 530 reports the reference signal quality of the first base station 510 to the first base station 510
  • the second user terminal 540 reports the reference signal of the first base station 510.
  • the quality and the reference signal quality of the second base station 520 may be reported to the second base station 520.
  • the user terminals 530 and 540 may report the quality of the reference signal in the form of a reference signal received power (RSRP) value.
  • RSRP reference signal received power
  • each of the base stations 510 and 520 is previously described with reference to FIG. 1 through FIG. 1 based on the information of the user terminal associated with itself, the channel information of the corresponding user terminal and its communication connection, the signal quality information, etc. received through step S504. Generates and exchanges the first to sixth reliability information described through 3. According to an embodiment of the present invention, since each base station 510, 520 already knows the information of the user terminal associated with it, the channel information of the user terminal and its communication connection, signal quality information, etc., the user terminal The first reliability information can be generated directly without intervention, and other reliability information can be generated directly based on the generated first reliability information. In addition, after updating and exchanging reliability information for a predetermined number of times in step S505, the connection between the active base station and the base station and the user terminal is determined.
  • the base station determined to be inactive (eg, the second base station 520) is determined to be active by the user terminal (eg, the second user terminal 540) connected to the base station (eg
  • the first base station 510 may be instructed to move the communication connection (for example, to transmit a handover command).
  • the second user terminal 540 may perform the operation.
  • the access request signal may be transmitted to the first base station 510 according to the handover command received in S506.
  • the first base station 510 may transmit an access permission command to the second user terminal 540, and thus a communication connection between the second user terminal 540 and the first base station 510 may be established. .
  • the second user terminal 540 is generally closest to the second base station 520 and should be connected to the second base station 520, the energy consumption of the entire wireless communication system is reduced by exchanging reliability information between base stations.
  • the second base station 520 may be turned off, and the second user terminal 540 may be connected to the first base station 510.
  • the first user terminal 530 and the second user terminal 540 are connected to the first base station 510 for a predetermined period of time to maintain a communication state, and the above-described steps S501 to S508 are performed according to a predetermined period. It may be performed repeatedly.
  • the base station apparatus 600 may include a communication unit 610 and a processor 620.
  • the base station apparatus 600 may further include other components not shown in FIG. 6 in addition to the communication unit 610 and the processor 620.
  • the base station apparatus 600 may include a storage unit that cooperates with the communication unit 610 and the processor 620.
  • the above-described lookup table may be stored in the storage, and the processor 620 may generate or update reliability information by using the lookup table stored in the storage.
  • the base station apparatus 600 of FIG. 6 may be the same as each of the base stations 110, 120, and 130 included in the wireless communication system 10 described above with reference to FIGS. 1 and 2.
  • the communication unit 610 may receive the first reliability information from the adjacent user terminal 630 of the base station apparatus 600. In addition, the communication unit 610 may exchange second reliability information and fourth reliability information with another base station apparatus 640 adjacent to the base station apparatus 600. In addition, the communication unit 610 may transmit the third reliability information to the adjacent user terminal 630. The communication unit 610 may transmit and receive reliability information through one or more of wireless or wired. In addition, the communication unit 610 may transmit a command or signal necessary for a communication connection, such as a handover command, to an adjacent user terminal according to the determination of the processor 620.
  • the processor 620 may generate third reliability information related to additional transmission power required by increasing the number of user terminals connected to the base station apparatus 600 based on the first reliability information and the second reliability information received by the communication unit. have.
  • the processor 620 generates fourth reliability information related to additional transmission power required by increasing the number of active base stations and the number of user terminals connected to the base station apparatus 600 among a plurality of base stations of the entire wireless communication system. can do.
  • the processor 620 may generate fifth reliability information indicating an active state preference of the base station apparatus 600 based on the second reliability information and the fourth reliability information received by the communication unit 610. In addition, the processor 620 may generate sixth reliability information related to additional transmission power required by increasing the first reliability information received by the communication unit 610 and the number of user terminals connected to the base station apparatus 600. .
  • the processor 620 may determine whether the base station apparatus 600 is active based on the fifth reliability information and the sixth reliability information. For example, the processor 620 may calculate the sum of the fifth reliability information and the sixth reliability information, and when the result has a value greater than zero, may determine to operate in an active state.
  • the processor 620 calculates a sum of the first reliability information and the third reliability information with respect to a connection relationship between at least one user terminal connected to the base station apparatus 600, and the result is greater than zero. It may be determined to activate the connection between the base station apparatus 600 and the corresponding user terminal.
  • the above-described base station control method may also be implemented in the form of a recording medium including instructions executable by a computer, such as a program module executed by a computer.
  • Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media.
  • Computer readable media may include both computer storage media and communication media.
  • Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.
  • Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transmission mechanism, and includes any information delivery media.
  • the above-described base station control method may be implemented in the form of a computer program stored in a recording medium.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de commande d'une station de base dans un système de communication sans fil comprenant une pluralité de stations de base, le procédé de commande d'une station de base selon la présente invention pouvant comprendre les étapes consistant à : (a) recevoir, au moyen de chaque station de base parmi la pluralité de stations de base, des premières informations de fiabilité relatives à la puissance d'émission entre chaque station de base et au moins un terminal d'utilisateur, en provenance de terminaux d'utilisateur adjacents à chaque station de base ; (b) recevoir, au moyen de chaque station de base, des deuxièmes informations de fiabilité relatives au nombre de stations de base qui se trouvent dans un état actif parmi la pluralité de stations de base, en provenance d'autres stations de base adjacentes à chaque station de base ; (c) générer, au moyen de chaque station de base, des troisièmes informations de fiabilité relatives à une puissance d'émission supplémentaire qui est requise par une augmentation du nombre de terminaux d'utilisateur connectés à chaque station de base, sur la base des premières informations de fiabilité et des secondes informations de fiabilité ; et d) émettre, au moyen de chaque station de base, les troisièmes informations de fiabilité vers les terminaux d'utilisateur adjacents à chaque station de base.
PCT/KR2015/010781 2015-05-19 2015-10-13 Procédé de commande de fonctionnement de station de base dans un système de communication sans fil WO2016186266A1 (fr)

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KR1020150069384A KR101675484B1 (ko) 2015-05-19 2015-05-19 무선통신시스템의 기지국 동작 제어 방법

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Citations (5)

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Publication number Priority date Publication date Assignee Title
KR20100113262A (ko) * 2009-04-13 2010-10-21 삼성전자주식회사 분산 다중 입출력 무선통신 시스템에서 전력 제어 장치 및 방법
KR20110096256A (ko) * 2010-02-22 2011-08-30 엘지전자 주식회사 분산 안테나 시스템에서의 신호 전송 방법
KR20120012042A (ko) * 2010-07-30 2012-02-09 국방과학연구소 섹터 안테나 시스템의 송신 전력 제어 장치 및 방법
KR20130021090A (ko) * 2011-08-22 2013-03-05 에스케이텔레콤 주식회사 기지국 제어 장치 및 방법
KR20130127311A (ko) * 2012-05-14 2013-11-22 한국전자통신연구원 송신 전력 제어 장치 및 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100113262A (ko) * 2009-04-13 2010-10-21 삼성전자주식회사 분산 다중 입출력 무선통신 시스템에서 전력 제어 장치 및 방법
KR20110096256A (ko) * 2010-02-22 2011-08-30 엘지전자 주식회사 분산 안테나 시스템에서의 신호 전송 방법
KR20120012042A (ko) * 2010-07-30 2012-02-09 국방과학연구소 섹터 안테나 시스템의 송신 전력 제어 장치 및 방법
KR20130021090A (ko) * 2011-08-22 2013-03-05 에스케이텔레콤 주식회사 기지국 제어 장치 및 방법
KR20130127311A (ko) * 2012-05-14 2013-11-22 한국전자통신연구원 송신 전력 제어 장치 및 방법

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