WO2012071827A1 - Procédé et système pour limiter la consommation électrique des stations de base - Google Patents

Procédé et système pour limiter la consommation électrique des stations de base Download PDF

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Publication number
WO2012071827A1
WO2012071827A1 PCT/CN2011/071683 CN2011071683W WO2012071827A1 WO 2012071827 A1 WO2012071827 A1 WO 2012071827A1 CN 2011071683 W CN2011071683 W CN 2011071683W WO 2012071827 A1 WO2012071827 A1 WO 2012071827A1
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WO
WIPO (PCT)
Prior art keywords
base station
base stations
communication traffic
central
group
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PCT/CN2011/071683
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English (en)
Chinese (zh)
Inventor
孙璐
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中兴通讯股份有限公司
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Publication of WO2012071827A1 publication Critical patent/WO2012071827A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • 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
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • 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 the field of communications, and in particular to a base station power consumption control method and system.
  • BACKGROUND OF THE INVENTION In a mobile communication system, since the number of users that each base station can accommodate and the amount of data that can be transmitted are limited, in order to meet the increasing demands of mobile communication users for call quality and data transmission performance, operators usually use Increase the base station's approach to increase system capacity.
  • communication traffic is not the same for all time periods. For example, during the exhibition center, the communication business volume will increase sharply during the exhibition, rather than the business volume during the exhibition period; in most areas, the communication traffic at night will be much lower than during the day.
  • the working state of the base station in the mobile communication system does not distinguish the traffic volume, and all the base stations maintain a normal working state regardless of the traffic volume, which causes a lot of unnecessary power consumption.
  • the radio frequency part is the highest power consumption of the base station.
  • the prior patent technology proposes several schemes for controlling the energy consumption of the base station according to the size of the base station traffic, which are mainly classified into the following types: Scheme 1: Base station According to the occupation of actual resources, the base station itself controls the turning on or off of the carrier frequency radio. When the base station detects that there is no user on a certain carrier frequency, or the number of channels occupied by a carrier frequency is zero, the radio frequency of the carrier frequency is turned off.
  • Solution 2 The carrier frequency on and off time periods of the subordinate base stations are preset on the operation and maintenance equipment, and the operation and maintenance equipment controls the base station carrier frequency to be turned on or off.
  • Solution 3 The base station controller is responsible for collecting the resource occupancy of the entire system, and according to the calculation result of the radio resource management algorithm, the carrier frequency of each base station in the control system is turned on or off.
  • the solution considers the resource occupation of a single base station, lacks macroscopic considerations for the entire system, and is likely to cause a state of high load operation of other working carrier frequencies after a certain carrier frequency is turned off.
  • Option 2 sets the carrier frequency on or off in advance, lacks flexibility, and is prone to carrier frequency and actual traffic. Inconsistent situation.
  • scheme 3 considers the resource usage of the entire system to dynamically control the carrier frequency state, which is more reasonable. However, in either case, power consumption is reduced by turning off part of the carrier frequency RF.
  • the base station using the same frequency point should try not to cover the same area.
  • the present invention provides a base station power consumption control method and system to solve at least one of the above problems, in view of the fact that the existing power control scheme can only turn off the radio frequency of some base stations in the area, and compares energy consumption and the like.
  • a base station power consumption control method including: dividing a base station group and setting a communication traffic threshold value of the foregoing base station group, where each base station group includes multiple base stations; Selecting a central base station in the base station, wherein the central base station can cover the coverage range of all the base stations in the base station group when transmitting the signal at the maximum power; the central base station compares the communication traffic of all the base stations in the base station group to which the base station belongs and the communication traffic gate The size of the limit; when the communication traffic of all base stations is lower than the above traffic traffic threshold, the central base station increases the current energy saving level, maximizes its transmit power, and switches the terminals corresponding to all base stations to the center.
  • the central base station compares the communication traffic volume and the traffic traffic threshold value of all the base stations in the base station group to which the base station belongs: the central base station receives the communication traffic amount reported by all the base stations in the base station group to which the central base station belongs, and counts the base station group.
  • the communication traffic of all base stations and compares the communication traffic of all base stations with the traffic traffic threshold.
  • the above communication traffic includes at least one of the following: the number of users, the number of channels occupied.
  • the method further includes: when the communication traffic volume of all the base stations exceeds the communication traffic threshold, the central base station decreases.
  • the current energy saving level informs all base stations to turn on the radio and reduce the transmit power of the central base station.
  • the method further includes: setting a buffer communication traffic threshold; when the communication traffic of all base stations is lower than a difference between the communication traffic threshold and the buffered traffic threshold, the central base station increases the current energy saving level.
  • the base station group with the base station as a basic component is the lowest level base station group among the multi-level base station groups, wherein the multi-level base station group corresponds to multiple energy-saving levels, and the base station groups of the multi-level base station group are at the lower level.
  • the base station group is a basic constituent unit, and each base station group has a central base station.
  • a base station power consumption control system including: an operation control center, a base station, and the operation control center, including: a base station group division module, configured to divide a base station group, where each base station group a plurality of base stations are included; a communication traffic threshold setting module is configured to set a communication traffic threshold of the base station group; and a central base station selection module is configured to select a central base station among the multiple base stations, where The central base station can cover the coverage of all the base stations in the base station group when transmitting the signal at the maximum power; the central base station includes: a communication traffic comparison module, configured to compare the communication traffic of all the base stations in the base station group to which the network station belongs, and the foregoing communication The size of the traffic threshold; the mode switching module is configured to increase the current energy saving level and maximize the transmitting power of the central base station when the communication traffic of all base stations in the base station group
  • the communication traffic comparison module is configured to receive the communication traffic periodically reported by all the base stations in the group of the base station to which it belongs, calculate the communication traffic of all the base stations in the base station group, and compare the communication traffic and the communication service of all the base stations.
  • the size of the threshold where the communication traffic includes at least one of the following: the number of users, the number of channels occupied.
  • the mode switching module is further configured to reduce the current energy saving level when all the communication traffic of the base station exceeds the communication traffic threshold, notify all the base stations to open the radio frequency, and reduce the transmission power of the central base station.
  • the communication traffic threshold setting module is further configured to set a buffer communication traffic threshold; the mode switching module is further configured to: the communication traffic at all base stations is lower than the communication traffic threshold and the buffer communication
  • the difference between the traffic thresholds is increased, the current energy-saving level is increased, the transmission power of the central base station is raised to the maximum, and the terminals corresponding to all base stations are switched to the central base station, and the shutdown is performed.
  • the base station turns on the radio and reduces the transmit power of the central base station.
  • the above operation control center further includes: a multi-level base station group establishing module, configured to establish a multi-level base station group by using a base station group as a basic constituent unit of the base station group, and a multi-level base station group, wherein, the multi-level The base station group corresponds to multiple energy-saving levels, and each of the base station groups in the multi-level base station group has its lower-level base station group as a basic constituent unit, and each base station group has one central base station.
  • a multi-level base station group establishing module configured to establish a multi-level base station group by using a base station group as a basic constituent unit of the base station group, and a multi-level base station group, wherein, the multi-level The base station group corresponds to multiple energy-saving levels, and each of the base station groups in the multi-level base station group has its lower-level base station group as a basic constituent unit, and each base station group has one central base station.
  • FIG. 1 is a flowchart of a base station power consumption control method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a base station deployment according to an example of the present invention
  • FIG. 3 is a parameter setting flow of an operation and maintenance center according to an example of the present invention
  • FIG. 4 is a flow chart of an operation mode (energy saving level) switching according to an example of the present invention
  • FIG. 5 is a schematic structural diagram of a base station power consumption control system according to an embodiment of the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • 1 is a flow chart of a base station power consumption control method according to an embodiment of the present invention. As shown in FIG. 1, the base station power consumption control method according to the embodiment of the present invention includes: Step S102, dividing a base station group and setting a communication traffic threshold value of the base station group, where each base station group includes multiple base stations .
  • Step S104 Select one central base station among the multiple base stations, where the central base station can cover the coverage range of all base stations in the base station group when transmitting signals with maximum power.
  • Step S106 The central base station compares the communication traffic volume and the traffic traffic threshold value of all base stations in the base station group to which it belongs.
  • Step S108 When the communication traffic of all the base stations is lower than the communication traffic threshold, the central base station increases the current energy saving level, increases the transmission power to the maximum, and switches the terminals corresponding to all the base stations to the central base station. , Turn off the radio frequencies of all base stations except the central base station in all base stations.
  • Step S110 when the communication traffic of all base stations exceeds the communication traffic threshold, the central base station lowers the current energy saving level, and notifies all The base station turns on the radio and reduces the transmit power of the central base station.
  • the base station using the same frequency point should try not to cover the same area. This leads to the fact that in some areas, such as the exhibition center area, the base station is relatively dense in order to meet the peak traffic, and each base station cannot transmit signals at maximum power.
  • the radio frequency power of a certain base station ie, the central base station
  • the radio frequencies of all carrier frequencies under the coverage of the base station are turned off. In this way, only one radio frequency of the base station needs to be turned on in the area, thereby minimizing power consumption.
  • the central base station needs to notify all base stations to turn on the radio frequency and reduce its own transmit power to prevent the occurrence of interference, and the specific reduced value.
  • the transmission power of different energy saving levels may be set for the central base station in the operation and maintenance center.
  • base station components can be rated for two levels of energy savings: no energy savings and maximum energy savings.
  • the transmit powers set for the central base station under the two energy-saving levels are P0 and PM, respectively.
  • the step S106 may further include the following process: the central base station receives the communication traffic of all the base stations in the base station group to which it belongs, calculates the communication traffic of all the base stations in the base station group, and compares all the base stations. The size of the communication traffic and the traffic traffic threshold.
  • the foregoing communication traffic includes, but is not limited to, at least one of the following: the number of users, the number of occupied channels.
  • all base stations of the base station group can periodically report the communication traffic of the base station to the central base station, including the number of users, the number of occupied channels, etc., and the central base station is responsible for summarizing, and determining which mode the base station group is suitable for working in. . If the communication traffic is small, the central base station itself can accommodate these services, and the central base station expands its own transmit power until it can cover the entire area of the group, and notifies all the base stations of the group to switch the terminals in the current network to the central base station.
  • step S102 a buffer communication traffic threshold value may also be set based on the traffic traffic threshold.
  • step S108 and step S110 are changed to: Step S108', when the communication traffic of all base stations is lower than the difference between the communication traffic threshold and the buffer traffic threshold, the central base station is improved.
  • Step S110' when the communication traffic of all the base stations is higher than the sum of the communication traffic threshold and the buffer traffic threshold, the central base station lowers the current energy saving level, and notifies the base station group that all the base stations turn on the radio frequency, and Reduce the transmit power of the central base station. Further setting the buffer communication traffic threshold can prevent the ping-pong effect caused by a single threshold.
  • the foregoing base station group with the base station as a basic constituent unit may be the last-level base station group of the multi-level base station group, where the multi-level base station group corresponds to multiple energy-saving levels, and each of the multi-level base station groups
  • the level base station group has its lower level base station group as the basic constituent unit, and each base station group has one central base station.
  • multiple energy-saving levels may be set according to the size of the communication traffic in the current network, and a multi-level base station group is established, which is subdivided into multi-level sub-groups, and each level sub-group is further set with a central base station at each level. Layers are subdivided to maximize energy savings.
  • the base station group when the base station group is in the non-energy-saving class, all the base stations are in the working state; when the base station group is in the first-class energy-saving mode, the I-level central base station expands the transmit power to the set power at the level I energy-saving level, and the other base stations are turned off; When the base station group is at the maximum energy saving level, only the central base station transmits the signal with the power set by the maximum energy saving level, and all other base stations of the base station group turn off the radio frequency.
  • the base station is relatively densely distributed when operators deploy networks in a certain area.
  • each base station cannot transmit the signal at the maximum power.
  • the base station a transmits the radio frequency signal at the maximum power, it can cover the entire area, but in order to prevent the interference, the transmission power of the base station a is reduced to cover only the twill area.
  • the radio frequency power of the base station a can be adjusted to the maximum transmit power, and then the mobile terminals of all base stations under the coverage of the base station a are switched to the base station. On a, the radio frequencies of these base stations are turned off.
  • FIG. 3 is a flow chart of parameter setting of an operation and maintenance center according to an example of the present invention.
  • the parameter flow to be set is as follows.
  • Step S302 Base stations of a certain area are grouped, and each is specified.
  • the central base station of the group Taking the base station deployment structure shown in FIG. 2 as an example, the base stations a, b, c, d, e, f, and g are grouped into one group, and the central base station is the base station a.
  • Step S304 The central base stations of each group set the transmission power at different energy saving levels.
  • the base station component has two energy-saving levels: no energy saving and maximum energy saving, the lowest energy saving level when no energy saving, and the highest energy saving level when the maximum energy saving;
  • the fixed transmit powers are P0 and PM, respectively.
  • Step S306 Set a communication traffic threshold of each energy-saving level of the base station group, including the number of users, the number of occupied channels, and the like.
  • the energy-saving traffic threshold must be less than the maximum capacity of the group of central base stations. If the central base station can accommodate up to 300 users, the energy-saving threshold must be less than 300 users. Otherwise, when the group of base stations enters the maximum energy-saving level mode, some users cannot access the central base station and affect the quality of service. In order to prevent the ping-pong effect caused by a single threshold, the buffer threshold may be further set. If the communication traffic of the base station group is lower than the difference between the maximum energy-saving threshold and the buffer threshold, the switch to the maximum energy-saving level is allowed; and the maximum energy-saving level is exited.
  • Step S308 The setting data of the operation and maintenance center is transmitted to each base station, that is, the parameters set in steps S302 to S306 are transmitted to all base stations, and each base station group operates according to the set parameters.
  • the base station group working mode (energy saving level) switching procedure is as follows: Step S402: All base stations of the base station group periodically send the current communication traffic of the local base station to the central base station of the group.
  • Step S406 If the result of the determination is the same as the energy saving level of the current base station group, no processing is required; if the determination result is different from the energy saving level of the current base station group, the process proceeds to step S408.
  • Step S408 Determine whether the energy saving level of the base station group is improved. If the base station group energy saving level is increased, the process proceeds to step S410; if the base station group energy saving level is lower, the process proceeds to step S412.
  • Step S410 When the energy saving level of the base station group is increased, the central base station needs to first increase the transmission power to the transmission power of the level set by the operation and maintenance center to ensure that the coverage of the central base station is larger.
  • Step S412 The central base station sends a power saving level switching indication to all the base stations of the group, where a new energy saving level is indicated. After receiving the indication message, each base station performs corresponding processing: If the value is high, the terminal of the base station is forcibly switched to the frequency of the central base station, and then the radio frequency signal of the base station is turned off, and the energy-saving level switching response message is returned to the central base station. Since the base station turns off the radio frequency, there is no longer a terminal.
  • Step S414 The central base station needs to collect the energy-saving level handover response message replied by all the base stations of the group.
  • Step S416 If the result of the decision in step S408 is that the energy saving level of the base station group is reduced, all the base stations of the base station group have turned off the turned off radio frequency in step S412. To prevent the wireless base station, the central base station needs to reduce the transmission power to the new one. The power level corresponds to the transmit power.
  • the base station power consumption control system includes: an operation control center 52, and a central base station 56.
  • the operation control center 52 may further include: a base station group dividing module 522, configured to divide the base station group Wherein, each base station group includes a plurality of base stations 54.
  • the communication traffic threshold setting module 524 is configured to set a communication traffic threshold of the foregoing base station group.
  • the central base station selection module 526 is configured to select a central base station 56 among the plurality of base stations 54, wherein the central base station 56 can cover the coverage range of all base stations in the base station group when transmitting signals at the maximum power; the central base station 56 can The method further includes: a communication traffic comparison module 562, configured to compare the communication traffic volume and the traffic traffic threshold value of all base stations in the base station group to which the group belongs; the mode switching module 564 is configured to perform communication services of all base stations in the base station group. When the quantity is lower than the communication traffic threshold, the current energy saving level is increased, the transmission power of the central base station 56 is raised to the maximum, and the terminals corresponding to all the base stations are switched to the central base station 56, and all the base stations except the center are turned off.
  • the mode switching module 564 is further configured to reduce the current energy saving level when all the communication traffic of the base station exceeds the communication traffic threshold, notify all the base stations to turn on the radio frequency, and reduce the transmission power of the central base station 56.
  • the above system is mainly for a relatively dense area of a base station. When the communication traffic of the network is small, only the transmit power coverage of the central base station 56 is increased, and the radio frequencies of other base stations 54 are turned off, thereby maximally saving the energy of the entire system. Consumption.
  • the operational control center 52 has a wired or wireless connection with each of the base stations 54 including the central base station 56.
  • Each of the base stations 54 including the central base station 56 also has a wired or wireless connection.
  • the communication traffic comparison module 562 of the central base station 56 can be configured to receive the communication traffic of all the base stations in the base station group to which it belongs, and calculate the communication traffic of all the base stations in the base station group. And comparing the communication traffic of all base stations with the size of the communication traffic threshold.
  • the foregoing communication traffic includes, but is not limited to, at least one of the following: the number of users, the number of occupied channels.
  • all base stations of the base station group can periodically report the communication traffic of the base station to the central base station 56, including the number of users, the number of occupied channels, etc., which are summarized by the central base station 56, and determine which mode the base station group is suitable for. Work under. If the communication traffic is small, the central base station 56 itself can accommodate these services, and the central base station 56 expands its own transmit power until it can cover the entire area of the group, and notifies all the base stations of the group to switch the terminals in the current network to At the central base station 56, the base station 54 of the base station group except the central base station 56 then turns off the radio frequency to achieve energy saving.
  • the central base station 56 When the number of users in the network increases, the central base station 56 notifies all the base stations of the group to turn on the radio, and the central base station 56 reduces the transmit power to the unpowered transmit power level to prevent interference with other base station 54 signals.
  • the communication traffic threshold setting module 524 can also be configured to set a buffer traffic threshold; the mode switching module 564 can also be configured to lower the communication traffic at all base stations than the communication traffic threshold.
  • the value is different from the buffered traffic threshold, the current energy saving level is increased, the transmission power of the central base station 56 is maximized, and the terminals corresponding to all base stations are switched to the central base station 56, and all base stations are turned off.
  • the operation control center 52 may further include: a multi-level base station group establishing module 528, configured to be the lowest level of the base station group with the base station 54 as a basic constituent unit divided by the base station group dividing module 522.
  • the base station group establishes a multi-level base station group, wherein the multi-level base station group corresponds to multiple energy-saving levels, and the base station groups in the multi-level base station group use the base station group of the first-level base as the basic constituent unit, and the base station groups at each level There is a central base station 56.
  • multiple energy-saving levels may be set according to the size of the communication traffic in the current network, and a multi-level base station group is established, which is subdivided into multi-level sub-groups, and each level sub-group is further set with a central base station at each level. Layers are subdivided to maximize energy savings.
  • each base station cannot transmit signals with maximum power, and when the communication traffic of the network is small, only Increasing the transmit power coverage of the central base station and turning off the radio frequencies of other base stations around the center minimizes the energy consumption of the entire system. Since the turn-off or turn-on of the peripheral base station radio is controlled by the central base station, the central base station requires the peripheral base station to turn off the radio frequency while increasing its coverage, ensuring that the interference is not affected and no interference is introduced.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

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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 et un système conçus pour limiter la consommation électrique des stations de base. Ce procédé comporte plusieurs étapes. Ainsi, on commence par répartir les stations de base par groupes de stations de base, et on définit les valeurs de seuil du volume du service de communication, chaque groupe de stations de base comprenant plusieurs stations de base (S102). On sélectionne ensuite parmi ces différentes stations de base une station de base centrale capable, en émettant les signaux à puissance maximale, d'assurer la couverture de toutes les stations de base du groupe de stations de base (S104). Dès lors, la station de base centrale considère le volume du service de communication de toutes les stations de base du groupe de stations de base auquel appartient la station de base centrale, et compare ce volume à la valeur de seuil du volume du service de communication (S106). Enfin, quand le volume du service de communication de toutes les stations de base est inférieur à la valeur de seuil du volume du service de communication, la station de base centrale augmente le niveau courant d'économie d'énergie, améliore sa puissance d'émission en l'amenant à son maximum, transfère à la station de base centrale tous les terminaux correspondant à toutes les stations de base, et coupe les fréquences radio des autres stations de base de l'ensemble des stations de base à l'exception de la station de base centrale (S108). La logique technique proposée par la présente invention permet d'économiser au maximum l'énergie consommée par l'ensemble du système.
PCT/CN2011/071683 2010-11-30 2011-03-10 Procédé et système pour limiter la consommation électrique des stations de base WO2012071827A1 (fr)

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CN201010567286.3A CN102014470B (zh) 2010-11-30 2010-11-30 基站功耗控制方法及系统
CN201010567286.3 2010-11-30

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WO2012116467A1 (fr) * 2011-02-28 2012-09-07 Telefonaktiebolaget L M Ericsson (Publ) Appareil et procédé d'économie d'énergie de stations de base
CN102869041A (zh) * 2011-07-07 2013-01-09 中兴通讯股份有限公司 一种选择节能小区的方法及系统
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WO2012163037A1 (fr) * 2011-10-31 2012-12-06 华为技术有限公司 Procédé de traitement économe en énergie pour station de base et station de base associée
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