WO2024125796A1 - Commande, basée sur des symboles, d'annulation d'intermodulation passive dans un nœud de réseau - Google Patents

Commande, basée sur des symboles, d'annulation d'intermodulation passive dans un nœud de réseau Download PDF

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Publication number
WO2024125796A1
WO2024125796A1 PCT/EP2022/086055 EP2022086055W WO2024125796A1 WO 2024125796 A1 WO2024125796 A1 WO 2024125796A1 EP 2022086055 W EP2022086055 W EP 2022086055W WO 2024125796 A1 WO2024125796 A1 WO 2024125796A1
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WO
WIPO (PCT)
Prior art keywords
symbol
pim
cancellation
pim cancellation
deactivate
Prior art date
Application number
PCT/EP2022/086055
Other languages
English (en)
Inventor
Hengsha LI
Emil SÄVQVIST
Jin ELLGARDT
Spendim Dalipi
Mats GAN KLINGBERG
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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.)
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Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/EP2022/086055 priority Critical patent/WO2024125796A1/fr
Publication of WO2024125796A1 publication Critical patent/WO2024125796A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver

Definitions

  • Embodiments presented herein relate to a method, a controller, a computer program, and a computer program product for symbol-based control of passive intermodulation cancellation in a network node.
  • PIM passive intermodulation
  • TX transmission
  • external PIM PIM generated by a metal fence on the roof top of a building, or even rusty bolts, in vicinity of the cell site
  • the power level of the PIM component is much lower in magnitude than the signal it originates from. Nevertheless, PIM becomes problematic in a cellular network when strong transmitted signals used for sending information to user equipment interact with the source of the PIM, hereinafter referred to as a PIM source. Interaction with one or more PIM source might cause noise to be introduced in the frequency band used to detect weaker received signals from served user equipment. This distortion of the received signals decreases the reliability, capacity, and data rate of wireless systems.
  • the transmitter power is reduced to effectively lower the PIM level.
  • One drawback is reduced coverage and/or downlink throughput.
  • expensive high- quality components are used at the TX radio chains. This might reduce internal PIM but will not affect the external PIM.
  • the frequency bands for transmission and/or reception is/are selected from a part of the frequency spectrum with less PIM distortions. This is not always possible as the frequency bands might be licensed and the available frequency spectrum is limited.
  • Another approach for PIM mitigation is PIM cancellation. PIM cancellation aims to use the transmit signals and receive signals to create a model for the PIM source(s) that are affecting the receive signal. This model is then used to create a replica signal of the PIM signal that impacts the receive signal.
  • the power consumption is one desire to keep the power consumption as low as possible. Furthermore, not only is the high power consumption an issue in itself, the high power consumption also causes thermal hot spots. This can be a bottleneck when it comes to cooling, power design, etc. of a piece of radio equipment. In turn, increasing the size of cooling components increases the size and weight of the piece of radio equipment.
  • An object of embodiments herein is to address the above issues with traditional approaches for PIM cancellation.
  • a method for symbol-based control of PIM cancellation in a network node The PIM cancellation is performed by executing a PIM cancellation algorithm.
  • the method is performed by a controller.
  • the method comprises determining whether to deactivate the PIM cancellation for an incoming baseband symbol in the network node or not as a function of any, or any combination of properties of the PIM cancellation algorithm, downlink power message information for the symbol, uplink power message information for the symbol.
  • the method comprises providing, in responsive to having determined to deactivate the PIM cancellation for the symbol, a deactivation indication to deactivate the PIM cancellation from is performed for the symbol.
  • a controller for symbol-based control of PIM cancellation in a network node The PIM cancellation is performed by executing a PIM cancellation algorithm.
  • the controller comprises processing circuitry.
  • the processing circuitry is configured to cause the controller to determine whether to deactivate the PIM cancellation for an incoming baseband symbol in the network node or not as a function of any, or any combination of properties of the PIM cancellation algorithm, downlink power message information for the symbol, uplink power message information for the symbol.
  • the processing circuitry is configured to cause the controller to provide, in responsive to having determined to deactivate the PIM cancellation for the symbol, a deactivation indication to deactivate the PIM cancellation from is performed for the symbol.
  • a controller for symbol-based control of PIM cancellation in a network node The PIM cancellation is performed by executing a PIM cancellation algorithm.
  • the controller comprises a determine module configured to determine whether to deactivate the PIM cancellation for an incoming baseband symbol in the network node or not as a function of any, or any combination of properties of the PIM cancellation algorithm, downlink power message information for the symbol, uplink power message information for the symbol.
  • the controller comprises a provide module configured to provide, in responsive to it having been determined to deactivate the PIM cancellation for the symbol, a deactivation indication to deactivate the PIM cancellation from is performed for the symbol.
  • a computer program for symbol-based control of PIM cancellation in a network node The PIM cancellation is performed by executing a PIM cancellation algorithm.
  • the computer program comprises computer code which, when run on processing circuitry of a controller, causes the controller to perform actions.
  • One action comprises the controller to determine whether to deactivate the PIM cancellation for an incoming baseband symbol in the network node or not as a function of any, or any combination of properties of the PIM cancellation algorithm, downlink power message information for the symbol, uplink power message information for the symbol.
  • One action comprises the controller to provide, in responsive to having determined to deactivate the PIM cancellation for the symbol, a deactivation indication to deactivate the PIM cancellation from is performed for the symbol.
  • a computer program product comprising a computer program according to the fourth aspect and a computer readable storage medium on which the computer program is stored.
  • the computer readable storage medium could be a non-transitory computer readable storage medium.
  • these aspects provide efficient PIM cancellation without experiencing the issues disclosed above.
  • these aspects improve the PIM cancellation compared to the state- of-the-art. Compared to traditional approaches, efficient PIM cancellation can be achieved with a minimum increase in power consumption, size, and weight of the network node.
  • these aspects enable power in components of the PIM cancellation, such as filter chains, to be reduced.
  • the herein disclosed aspects are easily integrated with existing PIM cancellation technologies.
  • Fig. 1 schematically illustrates a communication system according to embodiments
  • Fig. 2 schematically illustrates a block diagram for symbol-based control of PIM cancellation according to an embodiment
  • Fig. 3 schematically illustrates a block diagram for symbol-based control of PIM cancellation according to an embodiment
  • Fig. 4 is a flowchart of methods according to embodiments.
  • Fig. 5 schematically illustrates how PIM cancellation indicators affect the relationship between PIM power and downlink power according to an embodiment
  • Fig. 6 schematically illustrates a relationship between PIM power and downlink input power according to an embodiment
  • Fig. 7 schematically illustrates a relationship between PIM power and uplink power according to an embodiment
  • Fig. 8 is a schematic diagram showing functional units of a controller according to an embodiment
  • Fig. 9 is a schematic diagram showing functional modules of a controller according to an embodiment.
  • Fig. io shows one example of a computer program product comprising computer readable storage medium according to an embodiment.
  • a communication system loo comprising a block diagram of a network node no and an external PIM source 190.
  • the network node 110 comprises a (digital) baseband unit 112, a transmit radio chain 114 (along which is placed a digital to analogue (DAC) converter, a power amplifier (PA) and a transmit (Tx) filter), a receive radio chain 116 (along which is placed a receive (Rx) filter, a low noise amplifier (LNA), and an analogue to digital (ADC) converter), and an antenna system 118.
  • the network node no might comprise a plurality of transmit radio chains, a plurality of receive radio chains, and/or more than one antenna system.
  • an external PIM source 190 that, when being impinged by a transmit signal 180 as transmitted by the transmit radio chain 114, causes PIM to a receive signal 185 to be passed on to the receive radio chain 116 from the antenna system 118.
  • the PIM is caused by a PIM source 190 external to the network node 110.
  • a PIM source is referred to as an external PIM source.
  • the PIM is caused by an electric component, such as a passive electric component, in the network node 110, for example in the transmit radio chain 114.
  • Such a PIM source is referred to as an internal PIM source.
  • a controller 8oo, 900 a method performed by the controller 800, 900, a computer program product comprising code, for example in the form of a computer program, that when run on a controller 800, 900, causes the controller 800, 900 to perform the method.
  • Symbol-based control of PIM cancellation can be used to selectively switch a PIM cancellation algorithm on and off as needed based on traffic data status, such that PIM cancellation is not performed for zero-power symbol. This can save power, whilst maintaining the same radio performance.
  • Fig. 2 is shown a block diagram 200 for such symbol-based control of PIM cancellation.
  • the block diagram 200 comprises a PIM cancellation block 220 configured to perform symbol-based control of PIM cancellation on either downlink symbols or uplink symbols based on information received from a downlink block 210 representing the transmit radio chain 114, etc. in Fig. 1, and an uplink block 230 representing the receive radio chain 116, etc. in Fig. 1.
  • the symbol-based control of PIM cancellation is activated and deactivated by an activation/deactivation (“Act/Deact”) module 240.
  • the activation/deactivation module 240 is configured to deactivate the PIM cancellation from being performed for any zero-power symbols. This improves the power saving capability of the PIM cancellation block 220.
  • Fig. 3 is shown a block diagram 300 for such enhanced symbol -based control of PIM cancellation.
  • the block diagram 300 comprises a PIM cancellation block 220 configured to perform symbolbased control of PIM cancellation on either downlink symbols or uplink symbols based on information received from a downlink block 210 representing the transmit radio chain 114, etc. in Fig. 1, and an uplink block 230 representing the receive radio chain 116, etc. in Fig. 1.
  • the symbol -based control of PIM cancellation is activated and deactivated by an activation/deactivation (“Act/Deact”) module 240.
  • the activation/deactivation module 240 is configured to deactivate the PIM cancellation from being performed for any zero-power symbols. However, the activation/deactivation module 240 might further also deactivate the PIM cancellation from being performed in other situations.
  • This additional deactivation of the PIM cancellation is controlled by a threshold (Thr,) module 310.
  • the threshold module 310 takes its input from the downlink block 210 (“DL Info”), from the uplink block 230 (“UL Info”), and from the PIM cancellation block 220 (“PIMC Info”).
  • the information from the downlink block 210 and the uplink block 230 can be processed by the threshold module 310.
  • the herein disclosed controller 800, 900 at least implements the functionality of the threshold module 310. Further details relating to such enhanced symbol-based control of PIM cancellation will be disclosed next with reference to Fig. 4.
  • Fig. 4 is a flowchart illustrating embodiments of methods for symbol-based control of PIM cancellation in a network node 110.
  • the PIM cancellation is performed by executing a PIM cancellation algorithm.
  • the methods are performed by the controller 800, 900.
  • the methods are advantageously provided as computer programs 1020.
  • the deactivation of the symbol-based PIM cancellation is dynamically controlled as a function of received downlink power message information, uplink power message information, and information of the PIM cancellation algorithm itself.
  • the controller 800, 900 determines whether to deactivate the PIM cancellation for an incoming baseband symbol in the network node 110 or not. Whether to deactivate the PIM cancellation or not is determined as a function of any, or any combination of: properties of the PIM cancellation algorithm, downlink power message information for the symbol, uplink power message information for the symbol.
  • this information could come from the PIM cancellation block 220, the downlink block 210, and/or the uplink block 230.
  • S104 The controller 800, 900 provides, in responsive to having determined to deactivate the PIM cancellation for the symbol, a deactivation indication to deactivate the PIM cancellation from being performed for the symbol.
  • Embodiments relating to further details of symbol-based control of PIM cancellation in a network node 110 as performed by the controller 800, 900 will now be disclosed.
  • the PIM cancellation block 220 implements a PIM cancellation algorithm according to which symbol-based control of PIM cancellation is performed where the PIM cancellation is deactivated (e.g., by activation/deactivation module 240) from being performed for any zero-power symbols, then the determination of whether to deactivate the PIM cancellation needs only to be made for non-zero power symbol. Therefore, in some embodiments, the incoming baseband symbol is a non-zero power symbol.
  • the properties of the PIM cancellation algorithm pertain to any, or any combination of: expected, estimated, or measured, PIM power level for the symbol, one or more PIM cancellation algorithm performance indicators, such as guard band supervision, cancellation depth, PIM model scaling. For example, if the PIM level is high but the cancellation depth is low, this may indicate that other types of interference than PIM are more predominant in the network node 110. This information could be used to deactivate the PIM cancellation.
  • Fig. 5 is shown how PIM cancellation indicators affect the relationship between PIM power and downlink power for two downlink carriers, denoted “DL 1” and “DL 2”.
  • the performance indicators show that the PIM power model is more sensitive to DL 1 than DL 2, and DL 1 therefore has lower power threshold for deactivating the PIM cancellation.
  • the incoming baseband symbols could be part of either downlink signals or uplink signals.
  • the incoming baseband symbol is to be included in a downlink signal to be wirelessly transmitted from the network node 110, whereas in other examples, the incoming baseband symbol is extracted from an uplink signal as wirelessly received by the network node 110.
  • whether to deactivate the PIM cancellation for the symbol or not is determined as a function of the downlink power message information at least when the incoming baseband symbol is to be included in a downlink signal to be wirelessly transmitted from the network node no.
  • the downlink power message information for the symbol pertains to any, or any combination of: slot information, symbol power information, subframe information, physical resource block information, downlink noise floor.
  • Fig. 6 is shown a relationship between PIM power and downlink input power.
  • Power thresholds for three different conditions for where the PIM cancellation can be deactivated are also illustrated. For example, high sensitivity is shown under the highest downlink performance (according to the threshold denoted “Worst Case”). Such a threshold guarantees that PIM cancellation is activated as soon as the PIM power is above the downlink noise floor. If the downlink power is higher, the threshold sensitivity can be reduced to save more power (according to the thresholds denoted “Condition 1” and “Condition 2”).
  • whether to deactivate the PIM cancellation for the symbol or not is determined as a function of the uplink power message information at least when the incoming baseband symbol is extracted from an uplink signal as wirelessly received by the network node 110.
  • the uplink power message information for the symbol pertains to any, or any combination of: slot information, symbol power information, subframe information, physical resource block information, uplink noise floor.
  • Fig. 7 is shown a relationship between PIM power and uplink power.
  • Power thresholds for two different conditions for where the PIM cancellation can be deactivated are also illustrated. For example, high sensitivity is shown under the highest uplink performance (according to the threshold denoted “threshold for UL noise floor 1”). Such a threshold guarantees that PIM cancellation is activated as soon as the PIM power is above the lowest uplink noise floor. If the uplink power is higher, the threshold sensitivity can be reduced to save more power (according to the threshold denoted “threshold for UL noise floor 2”).
  • the correlation of downlink power and uplink power may indicate how severe the interference is, if information about what is the scheduled UE power is also available. Subtracting the UE scheduled power from the uplink power gives an indication about the interference. If the interference is correlated with the downlink power, it can be concluded that downlink induced interference is present, where the level of correlation indicates how strongly the downlink induced interference is. In some embodiments, whether to deactivate the PIM cancellation for the symbol or not is therefore determined as a function of a relation between the PIM power level for the symbol and the symbol power information.
  • the desensitization of the receive radio chain 116 due to PIM is related to how weak, or strong, the non-linearity of the PIM is, i.e., the relation between downlink induced fields and the PIM level, as well as the relation between the PIM level and other type of interference in the network node 110, not related to PIM.
  • Some examples of such other type of interference are thermal noise and intercell interference. If the receiver sensitivity is limited by another type of interference, not related to PIM, then that information can be utilized to deactivate the PIM cancellation since the impact of PIM cancellation would have small impact on the overall system gain. Therefore, in some embodiments, whether to deactivate the PIM cancellation for the symbol or not is further determined as a function of network node information, such as any, or any combination of: receiver sensitivity, thermal noise, intercell interference.
  • the threshold to deactivate the PIM cancellation is adaptively set according to an objective to fulfil some downlink or uplink PIM cancellation requirements. Therefore, in some embodiments, whether to deactivate the PIM cancellation for the symbol or not is determined with respect to a constraint to fulfil a downlink and/or uplink PIM cancellation requirement. This is reflected by the thresholds denoted “Condition 1” and “Condition 2” in the examples in Fig. 6.
  • the PIM cancellation should be applied whenever there is a possibility that the PIM signal appears above the uplink noise floor. Therefore, in some embodiments, for a highest downlink and/or uplink PIM cancellation requirement, the PIM cancellation is not deactivated when the PIM power level for the symbol is higher than the downlink and/or uplink noise floor. This is reflected by the thresholds in the examples in Fig. 7.
  • the PIM cancellation involves utilizing at least one filter chain, and the deactivation indication is provided to deactivate the at least one filter chain from processing the symbol. Further, in some examples, the PIM cancellation involves utilizing at least one clock, and the deactivation indication is provided to turn off the at least one clock during duration of the symbol.
  • two or more of the herein disclosed controller8oo, 900 are cascaded. The output of one controller 800, 900 could then be used as input to the next controller 800, 900.
  • the PIM cancellation is performed in a sequence of daisy-chained PIM cancellation blocks, and each controller 800, 900 is configured for symbol -based control of PIM cancellation in one of the PIM cancellation blocks.
  • Fig. 8 schematically illustrates, in terms of a number of functional units, the components of a controller 800 according to an embodiment.
  • Processing circuitry 810 is provided using any combination of one or more of a suitable central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), etc., capable of executing software instructions stored in a computer program product 1010 (as in Fig. 10), e.g. in the form of a storage medium 830.
  • the processing circuitry 810 may further be provided as at least one application specific integrated circuit (ASIC), or field programmable gate array (FPGA).
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the processing circuitry 810 is configured to cause the controller 800 to perform a set of operations, or steps, as disclosed above.
  • the storage medium 830 may store the set of operations
  • the processing circuitry 810 may be configured to retrieve the set of operations from the storage medium 830 to cause the controller 800 to perform the set of operations.
  • the set of operations maybe provided as a set of executable instructions.
  • the processing circuitry 810 is thereby arranged to execute methods as herein disclosed.
  • the storage medium 830 may also comprise persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the controller 800 may further comprise a communications (comm.) interface 820.
  • the communications interface 820 may comprise one or more transmitters and receivers, comprising analogue and digital components.
  • the processing circuitry 810 controls the general operation of the controller 800 e.g. by sending data and control signals to the communications interface 820 and the storage medium 830, by receiving data and reports from the communications interface 820, and by retrieving data and instructions from the storage medium 830.
  • Other components, as well as the related functionality, of the controller 800 are omitted in order not to obscure the concepts presented herein.
  • Fig. 9 schematically illustrates, in terms of a number of functional modules, the components of a controller 900 according to an embodiment.
  • the controller 900 of Fig. 9 comprises a number of functional modules; a determine module 910 configured to perform step S102, and a provide module 920 configured to perform step S104.
  • the controller 900 of Fig. 9 may further comprise a number of optional functional modules, as represented by functional module 930.
  • each functional module 910:930 may in one embodiment be implemented only in hardware and in another embodiment with the help of software, i.e., the latter embodiment having computer program instructions stored on the storage medium 830 which when run on the processing circuitry makes the controller 800, 900 perform the corresponding steps mentioned above in conjunction with Fig 9.
  • one or more or all functional modules 910:930 maybe implemented by the processing circuitry 810, possibly in cooperation with the communications interface 820 and/or the storage medium 830.
  • the processing circuitry 810 may thus be configured to from the storage medium 830 fetch instructions as provided by a functional module 910:930 and to execute these instructions, thereby performing any steps as disclosed herein.
  • the controller 800, 900 may be provided as a standalone device or as a part of at least one further device.
  • the controller 800, 900 may be provided in a node of the radio access network and might be part of, integrated with, or collocated with, the network node 110.
  • functionality of the controller 800, 900 may be distributed between at least two devices, or nodes.
  • a first portion of the instructions performed by the controller 800, 900 may be executed in a first device, and a second portion of the of the instructions performed by the controller 800, 900 may be executed in a second device; the herein disclosed embodiments are not limited to any particular number of devices on which the instructions performed by the controller 800, 900 may be executed.
  • the methods according to the herein disclosed embodiments are suitable to be performed by a controller 800, 900 residing in a cloud computational environment. Therefore, although a single processing circuitry 810 is illustrated in Fig. 8 the processing circuitry 810 may be distributed among a plurality of devices, or nodes. The same applies to the functional modules 910:930 of Fig. 9 and the computer program 1020 of Fig. 10.
  • Fig. 10 shows one example of a computer program product 1010 comprising computer readable storage medium 1030.
  • a computer program 1020 can be stored, which computer program 1020 can cause the processing circuitry 810 and thereto operatively coupled entities and devices, such as the communications interface 820 and the storage medium 830, to execute methods according to embodiments described herein.
  • the computer program 1020 and/or computer program product 1010 may thus provide means for performing any steps as herein disclosed.
  • the computer program product 1010 is illustrated as an optical disc, such as a CD (compact disc) or a DVD (digital versatile disc) or a Blu-Ray disc.
  • the computer program product 1010 could also be embodied as a memory, such as a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or an electrically erasable programmable read-only memory (EEPROM) and more particularly as a non-volatile storage medium of a device in an external memory such as a USB (Universal Serial Bus) memory or a Flash memory, such as a compact Flash memory.
  • the computer program 1020 is here schematically shown as a track on the depicted optical disk, the computer program 1020 can be stored in any way which is suitable for the computer program product 1010.

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

Abstract

L'invention concerne des techniques de commande, basée sur des symboles, d'annulation de PIM dans un nœud de réseau. L'annulation de PIM est effectuée par l'exécution d'un algorithme d'annulation de PIM. Un procédé est effectué par un contrôleur. Le procédé consiste à déterminer s'il faut désactiver ou non l'annulation de PIM pour un symbole de bande de base entrant dans le nœud de réseau en fonction de l'une quelconque, ou de toute combinaison, parmi des propriétés de l'algorithme d'annulation de PIM, des informations de message de puissance de liaison descendante pour le symbole, des informations de message de puissance de liaison montante pour le symbole. Le procédé consiste à fournir, quand il a été déterminé de désactiver l'annulation de PIM pour le symbole, une indication de désactivation pour désactiver l'annulation de PIM effectuée pour le symbole.
PCT/EP2022/086055 2022-12-15 2022-12-15 Commande, basée sur des symboles, d'annulation d'intermodulation passive dans un nœud de réseau WO2024125796A1 (fr)

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PCT/EP2022/086055 WO2024125796A1 (fr) 2022-12-15 2022-12-15 Commande, basée sur des symboles, d'annulation d'intermodulation passive dans un nœud de réseau

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PCT/EP2022/086055 WO2024125796A1 (fr) 2022-12-15 2022-12-15 Commande, basée sur des symboles, d'annulation d'intermodulation passive dans un nœud de réseau

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120295558A1 (en) * 2011-05-20 2012-11-22 Telefonaktiebolaget Lm Ericsson (Publ) Dynamic Cancellation of Passive Intermodulation Interference
WO2021198741A1 (fr) * 2020-04-03 2021-10-07 Telefonaktiebolaget Lm Ericsson (Publ) Procédé d'acquisition de sous-espace de liaison descendante pim
US20220376736A1 (en) * 2019-07-16 2022-11-24 Nokia Solutions And Networks Oy Pim cancellation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120295558A1 (en) * 2011-05-20 2012-11-22 Telefonaktiebolaget Lm Ericsson (Publ) Dynamic Cancellation of Passive Intermodulation Interference
US20220376736A1 (en) * 2019-07-16 2022-11-24 Nokia Solutions And Networks Oy Pim cancellation
WO2021198741A1 (fr) * 2020-04-03 2021-10-07 Telefonaktiebolaget Lm Ericsson (Publ) Procédé d'acquisition de sous-espace de liaison descendante pim

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