WO2011144251A1 - Adaptation dynamique de la prise en charge du trafic radio au moyen d'une station de base pouvant être exploitée en mode écoute - Google Patents

Adaptation dynamique de la prise en charge du trafic radio au moyen d'une station de base pouvant être exploitée en mode écoute Download PDF

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Publication number
WO2011144251A1
WO2011144251A1 PCT/EP2010/057047 EP2010057047W WO2011144251A1 WO 2011144251 A1 WO2011144251 A1 WO 2011144251A1 EP 2010057047 W EP2010057047 W EP 2010057047W WO 2011144251 A1 WO2011144251 A1 WO 2011144251A1
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WO
WIPO (PCT)
Prior art keywords
base station
operational mode
receiver
set forth
transmitter
Prior art date
Application number
PCT/EP2010/057047
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English (en)
Inventor
Maciej Pakulski
Patryk Pisowacki
Andrzej Waz-Ambrozewicz
Original Assignee
Nokia Siemens Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Priority to PCT/EP2010/057047 priority Critical patent/WO2011144251A1/fr
Publication of WO2011144251A1 publication Critical patent/WO2011144251A1/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
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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 generally relates to the technical field of wireless telecommunication networks.
  • the present invention relates to a base station for a wire ⁇ less radio telecommunication network, wherein, for the sake of an efficient energy usage, the base station can be oper- ated with different operational modes.
  • the present invention relates to a wireless telecommunication network which comprises at least two such base stations.
  • the present invention relates to a method for operating such a base station and to a method for operating a wireless tele- communication network comprising at least two base stations as described above.
  • the radio data transmission capacity which is required from a wireless telecommunication network, is typically not constant over time.
  • the radio usage patterns reflect the daily activity of the users as well as environmental factors.
  • SON Self Organizing Networks
  • SON techniques used to optimize the network cov ⁇ erage and capacity as a function of (a) the radio data traf ⁇ fic demand and (b) user behaviors include interference coor ⁇ dination and/or load balancing.
  • the decisions about the behavior of individual network nodes need to be pre- programmed into the SON algorithms.
  • a network node goes autonomously into a standby mode (a) if the traffic ceases for a prede ⁇ fined length of time (e. g. a network node going to "sleep" mode during the night time) or (b) at predefined points in time (e.g. at preset hour) .
  • a network node goes autonomously into a standby mode (a) if the traffic ceases for a prede ⁇ fined length of time (e. g. a network node going to "sleep" mode during the night time) or (b) at predefined points in time (e.g. at preset hour) .
  • a base station for a wireless telecommunication network comprises (a) a receiver for receiving radio signals, (b) a transmitter for transmitting radio sig- nals and (c) a control unit, which is connected to the trans ⁇ mitter and to the receiver.
  • the control unit is adapted to transfer the base station between a first operational mode and a second operational mode, whereby in the first opera ⁇ tional mode both the receiver and the transmitter are switch- ed on and in the second operational mode the receiver is at least partially active and the transmitter is switched off.
  • the described base station is based on the idea for reducing the overall energy consumption of a base station a new opera- tional mode (i.e. the second operational mode) can be de ⁇ fined, wherein the transmitter is completely switched off and wherein the receiver is kept in operation at least partially.
  • the second operational mode the described base station is at least capable of listening the incoming radio signal (s) . Therefore, the second operational mode can be denominated a "listening mode".
  • the base station may be any type of access point or point of attachment, which is capable of providing a wireless access to a telecommunication network.
  • the wireless access may be provided for a user equipment (UE) or for any other network element, which is capable of communicating in a wire- less manner.
  • the UE may be any type of communication end de ⁇ vice, which is capable of connecting with the described base station.
  • the UE may be in particular a cellular mobile phone, a Personal Digital Assistant (PDA) , a notebook computer, a printer and/or any other movable communication device.
  • PDA Personal Digital Assistant
  • the receiver in the second op- erational mode is capable of measuring an uplink radio power which is generated by at least one user equip ⁇ ment, which, if the base station is in the first operational mode, is capable of connecting to the base station.
  • the transmitter in the "listening mode” the transmitter is switched off and the receiver is configured for measuring the received uplink power of the surrounding radio environment. Therefore, the "listening mode” allows to "listen” to the surrounding radio environment in the uplink frequency band. If applicable, the control unit can again reactivate the transmitter and user equipments of the surrounding radio environment can connect to the base station.
  • an operational mode transfer from the second operational mode to the first operational mode would cause the nearby UEs to be handed over to the described base station with the activated or awaked transmitter.
  • the described base station is a micro base station such as for instance a home base station or a femto access point.
  • control unit is configured to change the operational mode of the base station from the first operational mode to the second operational mode, if the measured uplink radio power is below a first power threshold. This may provide the advantage that the base station can transfer itself into the above described "listening mode", if the surrounding radio environment is comparatively silent.
  • the ra- dio data traffic within the surrounding radio environment can be handled by at least one other base station and/or access point such that as a result there is (a) no bottleneck in handling radio data traffic and (b) an overall significant energy saving within the wireless telecommunication network.
  • control unit is configured to change the operational mode of the base station from the second operational mode to the first operational mode, if the measured uplink radio power is above a second power threshold.
  • This may mean that radio resources and power consumption, which are both associated with the described base station when being fully in operation, will be self activated when required for handling the radio data traffic. In case of a micro base station this may provide the advantage that these radio resources and power consumption can be kept below levels which are typically attributed to a micro base station.
  • RAN Network (RAN) resources are used, no measurement of its pilot signals are done and, as a result, the network topology is kept simple. This holds until radio condition occur which are justifying an activation of the described base station.
  • the first and the second power threshold may have the same or different values.
  • the second power threshold is larger than the first power threshold.
  • the base station is configured to inform at least one neighboring base station about a transfer of its operational mode.
  • control unit when control unit changes the operational mode of the base station from the second operational mode to the first operational mode (i.e. a wake up of the transmitter) the base station can transmit a dedicated message to other base stations within the nearby network environment in order to inform them about the transmitter wake up.
  • the telecommunication network is a LTE system and the recipient of the dedicated message is a neighboring eNB the known X2 interface can be used in order to efficiently transmit this message which indicates to neighboring stations a wake up respec ⁇ tively a status change due to the mentioned self activation.
  • the base station is a macro base station or a relay node of a cellular telecommunication network.
  • the base station In case of a Long Term Evolution (LTE) telecommunication net- work the base station is typically an enhanced NodeB (eNB) .
  • eNB enhanced NodeB
  • a relay node is typically used for improving in a cost effec ⁇ tive manner the performance and in particular the spatial coverage of a wireless telecommunication network.
  • the base station is a home base station.
  • a home base station is an access point, which is capable of serving a home cell or a so called femto cell.
  • the home respectively the femto cell may be for instance a small cellular region within the cellular telecommunication network.
  • the home base station serving the femto cell may also be called a femto ac ⁇ cess point.
  • the home base station is typically located at the premises of a customer of an internet service provider, of a customer of a mobile network operator and/or of a customer of any other telecommunication service provider.
  • a wireless telecommunication network which comprises (a) a first base station as described above and (b) a second base station as described above.
  • the first base sta ⁇ tion and the second base station are configured to exchange information about measurement reports about a measured uplink radio power.
  • the first base station and/or the second base station are configured to compare the exchanged in ⁇ formation.
  • the first base station and/or the second base station are configured to perform a decision, based on the comparison result, which one of the two base stations changes its operational mode.
  • the described wireless telecommunication network is based on the idea that the above described base stations can be used to coordinate with each other an adaptation of the network topology with respect to a selective activation or deactiva ⁇ tion of radio transmitters.
  • the first base station and the second base station are connected via an X2- interface .
  • the X2-interface is suitable in order to exchange the above de- scribed uplink measurement reports. Based on a comparison of these uplink measurement reports the first and/or the second base station or even any other network entity of the wireless telecommunication network can perform an optimized decision regarding which of the two base stations shall be switched on respectively transferred into the first operational mode.
  • the described measurement reports can be for instance those which are defined as “Received Interference Power or Thermal Noise Power” according to the 3GPP Technical Specification TS 36.214, or “Received Total Wideband Power", according to the 3GPP Technical Specification TS 25.214.
  • the deci ⁇ sion is based on the levels of the measured uplink radio power. This may mean that the base station, which reports the highest measured level on the uplink radio power above a cer ⁇ tain power threshold value, will switch itself on.
  • the same base station may also notify the other base station (s) about this fact, so that the remaining base sta ⁇ tion (s) refrain from switching on in order to avoid several base stations switching on one after another and causing problems like a sudden increase in signalling taking place in the network.
  • the base station may be in par- ticular a base station as described above.
  • the provide method comprises (a) transferring the base station between a first operational mode and a second operational mode, wherein in the first operational mode both a receiver for receiving ra ⁇ dio signals and a transmitter for transmitting radio signals are switched on and in the second operational mode the re ⁇ DCver is at least partially active and the transmitter is switched off.
  • the described method is based on the idea that the over- all energy consumption of a base station can be reduced by introducing a new second operational mode, wherein the trans ⁇ mitter is completely switched off and wherein the receiver is kept in operation at least partially. This may mean means that in this operational mode the described base station is only capable of listening incoming radio signal (s) .
  • the control unit can evaluate radio signals which have been received by the non sleeping re- ceiver. If the received radio signals fulfill a certain cri ⁇ teria such as for instance a certain power threshold, the switched off or sleeping transmitter can be reactivated such that the base station is again in the first operational mode.
  • a certain cri ⁇ teria such as for instance a certain power threshold
  • the present invention provides a method for operating a wireless telecommunication network, which comprises at least a first base station as de ⁇ scribed above and a second base station as described above.
  • the provided method comprises (a) measuring a first uplink radio power, which is received by the receiver of the first base station, (b) measuring a second uplink radio power, which is received by the receiver of the second base station, (c) exchanging information about the first uplink radio power and/or the second uplink radio power, (d) comparing the first uplink radio power with the second uplink radio power and (e) deciding, based on the result of comparing, which one of the first base station and the second base station changes its operational mode.
  • the described method is based on the idea that a wireless telecommunication network having at least temporarily a surplus with respect to radio data handling capacity of base stations can be dynamically operated in flexible manner. Spe- cifically, if there is a comparatively small radio data traf ⁇ fic demand, the overall energy consumption of the network can be reduced to a minimum. On the other hand, if there is a comparatively large radio data traffic demand, a sufficient overall network performance can be guaranteed by switching on at least one transmitter of a so far listening base station, wherein only the receiver of this base station has been active .
  • the described method is in particular well suited for base stations, which (a) can be switched between the above de ⁇ scribed first operational mode and the above described second operational mode and which (b) were deployed predominantly for extending the radio data capacity and not the spatial coverage of the wireless telecommunication network.
  • the described method may allow for realizing an efficient mechanism of activation of the base stations, wherein the ac ⁇ tivation is based on an actual radio data traffic demand in the vicinity of the respective base station. This may mean that a possible activation or a deactivation of a transmitter of a base station node can be based on a so called real-world feedback rather than a radio traffic estimation made by other network elements. Further, as has already been mentioned above, the overall energy usage of the wireless telecommuni ⁇ cation network can be improved by temporarily switching off a transmitter if it is unused and/or not needed.
  • the capacity of the wireless telecommunication network can be enhanced if more than one collocated or neighboring base stations are ac ⁇ tive at the same time. Further, the spectral efficiency may be improved if a UE is served by a nearby node, resulting in a good Signal to Noise Ratio (SNR) and in the possibility to use a good modulation/coding scheme allowing for higher radio data throughput.
  • SNR Signal to Noise Ratio
  • the computer program when being executed by a data processor, is adapted for controlling and/or for carrying out at least one embodiment of the above described meth ⁇ ods .
  • the computer-readable medium may be readable by a computer or a processor.
  • the computer-readable medium may be, for example but not limited to, an electric, magnetic, optical, infrared or semiconductor system, device or transmission medium.
  • the computer-readable medium may include at least one of the fol ⁇ lowing media: a computer-distributable medium, a program storage medium, a record medium, a computer-readable memory, a random access memory, an erasable programmable read-only memory, a computer-readable software distribution package, a computer-readable signal, a computer-readable telecommunica ⁇ tions signal, computer-readable printed matter, and a com ⁇ puter-readable compressed software package.
  • a program element for operating a base station of a wireless telecommunication network and/or for operating a wireless telecommunication network comprising at least two of such base stations.
  • the program element when being executed by a data processor, is adapted for controlling and/or for carrying out at least one embodiment of the above described methods .
  • the program element may be implemented as computer readable instruction code in any suitable programming language, such as, for example, JAVA, C++, and may be stored on a computer- readable medium (removable disk, volatile or non-volatile memory, embedded memory/processor, etc.).
  • the instruction code is operable to program a computer or any other program- mable device to carry out the intended functions.
  • the program element may be available from a network, such as the World Wide Web, from which it may be downloaded.
  • the invention may be realized by means of a computer program respectively software. However, the invention may also be re ⁇ alized by means of one or more specific electronic circuits respectively hardware. Furthermore, the invention may also be realized in a hybrid form, i.e. in a combination of software modules and hardware modules.
  • Figure 1 shows in accordance with an embodiment of the pre ⁇ sent invention a base station, which comprises a receiver, a transmitter and a control unit, wherein the control unit is capable of transferring the base station between a first and a second operational modes, wherein in the second operational mode the receiver is at least partially active and the trans ⁇ mitter is switched off.
  • Figure 2 shows a transactional message flow diagram, wherein a base station, which has changed its operational mode, in ⁇ forms a neighboring base station about this operational mode change .
  • Figure 1 shows in accordance with an embodiment of the pre ⁇ sent invention a base station 100, which comprises a receiver 110, a transmitter 120 and a control unit 130.
  • the control unit 130 is connected both to the receiver 110 and to the transmitter 120. Apart from controlling the operation of the receiver 110 and the transmitter 120 the control unit 130 is also used for setting up the base station 100 in different operational modes.
  • a first operational mode all the base station components, in particular the receiver 110 and the transmitter 120, are completely active.
  • This first operational mode will be set up if a large radio capacity is required from a wireless network which apart from other neighboring base station (s) comprises also the described base station 100.
  • a second operational mode the receiver 110 is kept at least partially active whereas the transmitter 120 is switch ⁇ ed off or is deactivated.
  • the base station 100 is only able to listen to uplink radio sig- nals, which are generated in the network neighborhood and which reach the receiver 110. Therefore, the second opera ⁇ tional mode is denominated a "listening mode".
  • the receiver 110 monitors a radio power den ⁇ sity in the uplink band. If the received radio power within an uplink band (i.e. an interference level) is above a prede ⁇ fined trigger threshold, the base station 100 is transferred back into the first operational state. This means that the transmitter 120 is again put in full operation such that downlink radio transmission of the base station 100 is resumed. As a consequence, at least some calls of UEs, which are located in the vicinity of the base station 100, will be handed over from neighboring base stations to the activated base station 100.
  • an uplink band i.e. an interference level
  • the described concept of a self activation if the radio power density exceeds a certain threshold may allow for a localiza ⁇ tion of UEs and taking over UE calls which are made in the vicinity of the activated base station 100. Such a mechanism allows to minimize interference and to increase the spectral efficiency of radio transmissions which results in a signifi- cant capacity enhancement.
  • Physical Resource Blocks since only those base stations which are located closest to one or more particular UEs will be ac ⁇ tive at the given time.
  • Different base stations may exchange information about their respective uplink measurement reports (e.g. Received Inter ⁇ ference Power or Thermal Noise Power according to TS 36.214 or Received Total Wideband Power according to TS 25.214) over an X2 interface.
  • These measurement reports can be compared by at least one of the base stations or by any other network en ⁇ tity in order to find an optimized decision which of them shall be switched on. Either simple or more advanced mechanisms may be implemented in order to select the base station, which is the most appro ⁇ priate for being switched on or activated (i.e. transferred from the second operational mode to the first operational mode) .
  • the base station which is sup ⁇ posed to be switched on will be the one that reports the highest measured signal level on the uplink channel (and higher than predefined activation threshold value) .
  • the base station which is then powered on, may notify the other base stations about its activation. As a consequence, remaining neighboring base stations may refrain from switching on during some predefined period of time. Thereby, a chain reaction of several nodes switching on one after another can be effectively avoided.
  • Such rush hour sites are for instance pico base sta ⁇ tions or femto base stations, which are deployed in order to fill radio signal handling capacity gaps, which occur in particular for a peak demand within a busy hour.
  • Such sites are intended to keep silent for the vast majority of the time, and are activated only during the excessive traffic demand in the vicinity (e.g. office park, football stadium, public out ⁇ door events) .
  • such base stations could ideally be activated by the actual users as a radio data handling need arises.
  • the described listening mode and the resulting capacity im ⁇ provement by e.g. a location-aware radio data traffic han ⁇ dling are not only possible with pico or femto base stations.
  • the second (listening") operational mode can also be realized with a macro base sta- tion such as a standalone eNodeB or a relay node (e.g. a re ⁇ peater) .
  • a macro base sta- tion such as a standalone eNodeB or a relay node (e.g. a re ⁇ peater) .
  • Figure 2 shows a transactional message flow diagram, wherein a first base station 200, which has changed its operational mode, informs a neighboring second base station 250 about its operational mode change.
  • the base stations 200 and 250 are eNodeBs of a LTE telecommunication network. Therefore, the eNodeB 200 and the eNodeB 250 are connected via a known X2 interface.
  • the first base station 200 indicates this operational mode change to the second base station 250 via an information element, which is sent over the X2 interface connecting the first base station 200 and the second base station 250.
  • This information element may be included in a modified "eNB configuration update” message (compare the 3GPP Technical Specification TS 36.423v 920 9.1.2.8). Fur ⁇ ther, the second base station 250 acknowledges a correct re ⁇ vapt of this information by an "eNB configuration update ac- knowledge" message.
  • the "eNB configuration update" message can not only be sent to one neighboring base station 250 but also to other non-depicted base stations which are deployed in the network environment of the first base station 200.
  • the base station 200 can inform all base stations within its neighborhood about the transfer from the second "listening" operational mode to the first "fully active" op ⁇ erational mode.

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

Abstract

L'invention concerne une station de base pour réseau de télécommunications sans fil. La station de base (100, 200) décrite comporte un récepteur (110) servant à recevoir des signaux radio, un émetteur (120) servant à émettre des signaux radio et une unité (130) de commande reliée à l'émetteur (120) et au récepteur (110). L'unité (130) de commande est prévue pour transférer la station de base (100, 200) entre un premier mode opérationnel et un deuxième mode opérationnel. Ainsi, dans le premier mode opérationnel, le récepteur (110) et l'émetteur (120) sont tous deux mis sous tension et dans le deuxième mode opérationnel, le récepteur (110) est au moins partiellement actif et l'émetteur (120) est mis hors tension. L'invention concerne en outre (a) un réseau de télécommunications sans fil comportant au moins deux de ces stations de base, (b) un procédé d'exploitation d'une telle station de base et (c) un procédé d'exploitation d'un réseau de télécommunications sans fil comportant au moins deux de ces stations de base.
PCT/EP2010/057047 2010-05-21 2010-05-21 Adaptation dynamique de la prise en charge du trafic radio au moyen d'une station de base pouvant être exploitée en mode écoute WO2011144251A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/057047 WO2011144251A1 (fr) 2010-05-21 2010-05-21 Adaptation dynamique de la prise en charge du trafic radio au moyen d'une station de base pouvant être exploitée en mode écoute

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/057047 WO2011144251A1 (fr) 2010-05-21 2010-05-21 Adaptation dynamique de la prise en charge du trafic radio au moyen d'une station de base pouvant être exploitée en mode écoute

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013107494A1 (fr) * 2012-01-16 2013-07-25 Nokia Siemens Networks Oy Commande de mode d'écoute de réseau
CN104159279A (zh) * 2014-07-08 2014-11-19 华南理工大学 一种基于能效准则的基站及中继开/关选择系统及方法
EP2827635A4 (fr) * 2012-03-15 2016-01-13 Nec Corp Système de communication sans fil, station sans fil, dispositif de gestion de fonctionnement de réseau et procédé d'optimisation de réseau
WO2021050297A1 (fr) * 2019-09-12 2021-03-18 Cisco Technology, Inc. Réduction d'interférence dans des réseaux cbrs

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DE102005051291A1 (de) * 2005-10-26 2007-05-03 Siemens Ag Verfahren zur Steuerung von Basisstationen in drahtlosen Kommunikationsnetzen
WO2008025874A1 (fr) * 2006-08-29 2008-03-06 Nokia Corporation Configuration de réseau
EP2141947A1 (fr) * 2008-07-04 2010-01-06 Nokia Siemens Networks OY Procédé de reconfiguration dynamique d'un réseau de communication

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Publication number Priority date Publication date Assignee Title
DE102005051291A1 (de) * 2005-10-26 2007-05-03 Siemens Ag Verfahren zur Steuerung von Basisstationen in drahtlosen Kommunikationsnetzen
WO2008025874A1 (fr) * 2006-08-29 2008-03-06 Nokia Corporation Configuration de réseau
EP2141947A1 (fr) * 2008-07-04 2010-01-06 Nokia Siemens Networks OY Procédé de reconfiguration dynamique d'un réseau de communication

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013107494A1 (fr) * 2012-01-16 2013-07-25 Nokia Siemens Networks Oy Commande de mode d'écoute de réseau
EP2827635A4 (fr) * 2012-03-15 2016-01-13 Nec Corp Système de communication sans fil, station sans fil, dispositif de gestion de fonctionnement de réseau et procédé d'optimisation de réseau
US10165454B2 (en) 2012-03-15 2018-12-25 Nec Corporation Radio communication system, radio station, network operation management apparatus, and network optimization method
CN104159279A (zh) * 2014-07-08 2014-11-19 华南理工大学 一种基于能效准则的基站及中继开/关选择系统及方法
CN104159279B (zh) * 2014-07-08 2018-04-13 华南理工大学 一种基于能效准则的基站及中继开/关选择系统及方法
WO2021050297A1 (fr) * 2019-09-12 2021-03-18 Cisco Technology, Inc. Réduction d'interférence dans des réseaux cbrs
US11089602B2 (en) 2019-09-12 2021-08-10 Cisco Technology, Inc. Reducing interference in CBRS networks
US11696319B2 (en) 2019-09-12 2023-07-04 Cisco Technology, Inc. Reducing interference in CBRS networks

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