WO2014012214A1 - Améliorations apportées à des réseaux hétérogènes - Google Patents

Améliorations apportées à des réseaux hétérogènes Download PDF

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Publication number
WO2014012214A1
WO2014012214A1 PCT/CN2012/078739 CN2012078739W WO2014012214A1 WO 2014012214 A1 WO2014012214 A1 WO 2014012214A1 CN 2012078739 W CN2012078739 W CN 2012078739W WO 2014012214 A1 WO2014012214 A1 WO 2014012214A1
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WIPO (PCT)
Prior art keywords
carrier
carriers
blank
aggressor
type
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PCT/CN2012/078739
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English (en)
Inventor
Lili Zhang
Haiming Wang
Original Assignee
Renesas Mobile Corporation
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Application filed by Renesas Mobile Corporation filed Critical Renesas Mobile Corporation
Priority to PCT/CN2012/078739 priority Critical patent/WO2014012214A1/fr
Publication of WO2014012214A1 publication Critical patent/WO2014012214A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • 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 an apparatus, a method, and a computer program product for heterogeneous networks. More particularly, the present invention relates to an apparatus, a method, and a computer program product for assigning carriers and/or slots. Background of the invention
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • HetNets heterogeneous networks
  • HetNets comprise network transceiver devices or, more general, network entities providing different, and at least partially overlapping coverage for communication, and those are simultaneously in operation.
  • eNB evolved NodeBs
  • eNB evolved NodeB
  • a macro eNB of "large” coverage
  • pico or femto eNBs or even remote radio heads (RRH) of "small” coverage when compared to the macro eNB's coverage
  • RRH remote radio heads
  • Terminals such as user equipments UE are present within the coverage of both entities and may experience interference due to the network entities operating on neighboring or even identical bandwidth partitions or (physical) channels.
  • a macro cell or macro eNB which typically transmits using higher transmission power can be regarded as a source of interference, and is thus referred to herein also as "aggressor cell”.
  • a pico cell or pico eNB more particularly the terminals camping in its coverage, experience the interference and are thus "victims".
  • a pico cell or pico eNB more particularly the terminals camping in its coverage, experience the interference and are thus "victims".
  • a physical channel carries plural logical channels such as one or more payload channels and one or more control channels, in uplink and/or downlink, which are distributed within a channel's physical resources.
  • a channel's physical resources are defined in time and frequency domain. As an example, it is referred to LTETM, where a smallest unit is named a resource element RE.
  • a RE carries in time domain one (QPSK modulated) symbol and has a corresponding duration, while in frequency domain it covers a bandwidth of one subcarrier.
  • a plurality of 7 symbols in time domain constitute 1 slot of 0.5 ms duration, 2 slots constitute 1 subframe of 1 ms duration, and 20 slots (10 subframes) constitute one radioframe of 10 ms duration.
  • a group of resource elements covering one slot in time domain and 12 subcarriers in frequency/bandwidth domain is referred to as physical resource block PRB.
  • a physical channel in general comprises one or more PRBs in bandwidth, but may also be definable as comprising a fraction (non-integer multiple) of one or more PRBs, in an extreme also as being represented by a single subcarrier only.
  • a group of 4 symbols is referred to as resource element group, REG. 9 REGs and thus 36 resource elements RE in turn constitute for example a control channel element CCE to which a PDCCH message is mapped.
  • resource elements of REGs and REG's of a CCE do not need to be adjacent to each other in time/frequency domain but can be distributed at distinct physical locations within a time/frequency resource grid of REs; they are thus at least logically linked to each other.
  • elCIC enhanced inter-cell interference coordination
  • CRE cell range expansion
  • the Resource Status mechanism enables a pico eNB to provide information in order to "aid the macro eNB designating ABS to evaluate the need for modification of the ABS pattern", as for example described in [1] to [3], It means that the macro eNB determines the ABS pattern adjustment based on the DL ABS status information.
  • low power ABS also known as reduced power ABS or non-zero power ABS
  • ZP- ABS zero power ABS
  • CA carrier aggregation
  • LA macro cell plus local area
  • RRH local area
  • the additional carrier type i.e. the extension carrier
  • ICIC inter-cell interference coordination
  • CRS cell-specific reference signal
  • PDCCH cell-specific reference signal
  • Such a blank subframe or radio resource features without CRS and PDCCH transmissions is also beneficial in reducing inter-cell interference in dense local area deployments with fractional traffic loads and in achieving energy efficient operation in small cells.
  • extension carrier should be activated/deactivated, and what is the appropriate number of the extension carriers is also still not explored, for example.
  • a new information element IE called "DL ABS Status IE" shall be included in the resource status update message, to reflect a resource usage indication allocated to the UEs protected by ABSs.
  • the macro eNB can determine whether the protected resources are effectively utilized or not, and do the corresponding measurement. However, it is targeted for the time domain ICIC, but not for the frequency domain in regard of a usage of CA and/or extension carriers.
  • the extension carrier is employed to combat the inter-cell interference, there are the following example cases on the carrier allocation and adjustment. a) Given that any component carrier can be configured as extension carrier. When a carrier is added/reduced, what kind of carrier (extension carrier or ordinary carrier) should it be activated/deactivated as?
  • extension carrier set and the ordinary carrier set.
  • the aggressor cell make an appropriate decision for the optimum allocation between extension carrier and ordinary carrier to maximize the performance overall the system?
  • PDCCH protected carrier means a carrier that mutes PDCCH part in aggressor cell. It may be a normal carrier in victim cell.
  • An extension carrier is an example of a PDCCH protected carrier.
  • some subframes are allowed to transmit data with a low transmission power in PDCCH/PDSCH.
  • an apparatus comprising classifying means adapted to classify a first terminal having at least a downlink communication with the apparatus into one of a cancellation category and a non-cancellation category, wherein the cancellation category indicates that the first terminal is capable of reference signal interference cancellation; assessing means adapted to assess whether the first terminal is affected by interference caused by an aggressor device by more than a first interference level; scheduling means adapted to schedule, if it is assessed that the first terminal is affected by more than the first interference level and the terminal is classified into the non-cancellation category, a first blank slot of a clear carrier for the downlink communication, and to schedule, if it is assessed that the first terminal is affected by more than the first interference level and the first terminal is classified into the cancellation category, a second blank slot of a normal carrier for the downlink communication, wherein the scheduling is based on a carrier information received from the aggressor device according to which the clear carrier is comprised by one or more extension carriers of the aggressor device and based on a slot
  • the apparatus may be comprised by a base station or a cell of a base station.
  • an apparatus comprising suppressing means adapted to suppress transmitting a reference signal on a carrier of an extension carrier type; first configuring means adapted to configure a first carrier to be of the extension carrier type; deploying means adapted to deploy one or more blank slots on the first carrier, wherein each of the blank slots is of an almost blank slot type or of a blank slot with reduced power type; checking means adapted to check if an indication received from a victim device indicates that a total ratio of a number of physical resource blocks in blank slots on the first carrier scheduled for downlink communication of terminals of a non-cancellation category by the victim device to a total number of physical resource blocks in blank slots on the first carrier exceeds a predetermined first threshold, wherein the terminals are indicated to be affected by an interference caused by the apparatus at more than a first interference level; and second configuring means adapted to configure a second carrier different from the first carrier to be of the extension carrier type if the first threshold is exceeded.
  • the apparatus may be comprised by a base
  • a method comprising classifying a first terminal having at least a downlink communication with an apparatus performing the method into one of a cancellation category and a non-cancellation category, wherein the cancellation category indicates that the first terminal is capable of reference signal interference cancellation; assessing whether the first terminal is affected by interference caused by an aggressor device by more than a first interference level; if it is assessed that the first terminal is affected by more than the first interference level and the terminal is classified into the non-cancellation category, scheduling a first blank slot of a clear carrier for the downlink communication, and if it is assessed that the first terminal is affected by more than the first interference level and the first terminal is classified into the cancellation category, scheduling a second blank slot of a normal carrier for the downlink communication, wherein the scheduling is based on a carrier information received from the aggressor device according to which the clear carrier is comprised by one or more extension carriers of the aggressor device and based on a slot information received from the aggressor device according to which each of the first and
  • a method comprising suppressing transmitting a reference signal on a carrier of an extension carrier type; configuring a first carrier to be of the extension carrier type; deploying one or more blank slots on the first carrier, wherein each of the blank slots is of an almost blank slot type or of a blank slot with reduced power type; checking if an indication received from a victim device indicates that a total ratio of a number of physical resource blocks in blank slots on the first carrier scheduled for downlink communication of terminals of a non-cancellation category by the victim device to a total number of physical resource blocks in blank slots on the first carrier exceeds a predetermined first threshold, wherein the terminals are indicated to be affected by an interference caused by an apparatus performing the method at more than a first interference level; and configuring a second carrier different from the first carrier to be of the extension carrier type if the first threshold is exceeded.
  • an apparatus comprising first receiving means adapted to receive, from a first aggressor device, a first indication of one or more first carriers of a plurality of carriers to be first candidates of an PDCCH protected carrier type of the first aggressor device; second receiving means adapted to receive, from a second aggressor device different from the first aggressor device, a second indication of one or more second carriers of the plurality of carriers to be second candidates of the PDCCH protected carrier type of the second aggressor device; negotiating means adapted to negotiate with the first aggressor device and the second aggressor device on a common available carrier of the plurality of carriers to be of the PDCCH protected carrier type of the first aggressor device and the second aggressor device; selecting means adapted to select the common available carrier; indicating means adapted to indicate the common available carrier to the first aggressor device and the second aggressor device to cause them to configure the common available carrier to be of the PDCCH protected carrier type.
  • an apparatus comprising monitoring means adapted to monitor if one or more carriers are common available carriers, wherein a common available carrier is indicated to be a candidate for a PDCCH protected carrier type by a first aggressor device and a candidate for a PDCCH protected carrier type by a second aggressor device different from the first aggressor device; informing means adapted to inform at least one of the first and second aggressor devices about the one or more common available carriers; and scheduling means adapted to schedule a terminal on the common available carrier.
  • an apparatus comprising selecting means adapted to select one or more candidate carriers of a plurality of carriers as candidates for an PDCCH protected carrier type of the apparatus; informing means adapted to inform an aggressor device about the candidate carriers; agreeing means adapted to agree with the aggressor device on an common available carrier of the plurality of carriers to be of the PDCCH protected carrier type of the apparatus and of the aggressor device; configuring means adapted to configure the common available carrier to be of the PDCCH protected carrier type; suppressing means adapted to suppress transmitting a control signal on the configured common available carrier.
  • an apparatus comprising selecting means adapted to select one or more candidate carriers of a plurality of carriers as candidates for an PDCCH protected carrier type; informing means adapted to inform a victim device about the candidate carriers; configuring means adapted to configure, based on an indication received from the victim device, a common available carrier of the plurality of carriers to be of the PDCCH protected carrier type; suppressing means adapted to suppress transmitting a control signal on the common available carrier.
  • an apparatus comprising informing means adapted to inform a victim device about one or more common available carriers, wherein the common available carriers are indicated in a message received from an operation and management system to be suitable as PDCCH protected carriers; and suppressing means adapted to suppress transmitting a control signal on the one or more common available carriers.
  • an apparatus comprising deciding means adapted to decide to configure a measurement of a terminal operatively connected to the apparatus, wherein an information received from a victim device about one or more common available carriers is taken into account in the deciding, wherein a common available carrier is indicated to be both a candidate for a PDCCH protected carrier type of the apparatus and a candidate for a PDCCH protected carrier type of an aggressor device different from the apparatus; configuring means adapted to configure the measurement of the terminal.
  • an apparatus comprising checking means adapted to check if both one or more first carriers of a plurality of carriers and one or more second carriers of the plurality of carriers comprise a common available carrier, wherein the first carriers are potential candidates to be of an PDCCH protected carrier type of a first aggressor device, and the second carriers are potential candidates to be of the PDCCH protected carrier type of a second aggressor device different from the first aggressor device; selecting means adapted to select, if the first and second carriers comprise the common available carrier, the common available carrier to be a candidate of the PDCCH protected carrier type of the first aggressor device and the second aggressor device; and informing means adapted to inform the first aggressor device and the second aggressor device about the common available carrier.
  • a method comprising receiving, from a first aggressor device, a first indication of one or more first carriers of a plurality of carriers to be first candidates of an PDCCH protected carrier type of the first aggressor device; receiving, from a second aggressor device different from the first aggressor device, a second indication of one or more second carriers of the plurality of carriers to be second candidates of the PDCCH protected carrier type of the second aggressor device; negotiating with the first aggressor device and the second aggressor device on a common available carrier of the plurality of carriers to be of the PDCCH protected carrier type of the first aggressor device and the second aggressor device; selecting the common available carrier; indicating the common available carrier to the first aggressor device and the second aggressor device to cause them to configure the common available carrier to be of the PDCCH protected carrier type.
  • a method comprising monitoring if one or more carriers are common available carriers, wherein a common available carrier is indicated to be a candidate for a PDCCH protected carrier type by a first aggressor device and a candidate for a PDCCH protected carrier type by a second aggressor device different from the first aggressor device; informing at least one of the first and second aggressor devices about the one or more common available carriers; and scheduling a terminal on the common available carrier.
  • a method comprising selecting one or more candidate carriers of a plurality of carriers as candidates for an PDCCH protected carrier type of an apparatus performing the method; informing an aggressor device about the candidate carriers; agreeing with the aggressor device on an common available carrier of the plurality of carriers to be of the PDCCH protected carrier type of the apparatus and of the aggressor device; configuring the common available carrier to be of the PDCCH protected carrier type; suppressing transmitting a control signal on the configured common available carrier.
  • a method comprising selecting one or more candidate carriers of a plurality of carriers as candidates for an PDCCH protected carrier type; informing a victim device about the candidate carriers; configuring, based on an indication received from the victim device, a common available carrier of the plurality of carriers to be of the PDCCH protected carrier type; suppressing transmitting a control signal on the common available carrier.
  • a method comprising informing a victim device about one or more common available carriers, wherein the common available carriers are indicated in a message received from an operation and management system to be suitable as PDCCH protected carriers; and suppressing transmitting a control signal on the one or more common available carriers.
  • a method comprising deciding to configure a measurement of a terminal operatively connected to an apparatus performing the method, wherein an information received from a victim device about one or more common available carriers is taken into account in the deciding, wherein a common available carrier is indicated to be both a candidate for a PDCCH protected carrier type of the apparatus and a candidate for a PDCCH protected carrier type of an aggressor device different from the apparatus; configuring the measurement of the terminal.
  • a method comprising checking if both one or more first carriers of a plurality of carriers and one or more second carriers of the plurality of carriers comprise a common available carrier, wherein the first carriers are potential candidates to be of an PDCCH protected carrier type of a first aggressor device, and the second carriers are potential candidates to be of the PDCCH protected carrier type of a second aggressor device different from the first aggressor device; selecting, if the first and second carriers comprise the common available carrier, the common available carrier to be a candidate of the PDCCH protected carrier type of the first aggressor device and the second aggressor device; and informing the first aggressor device and the second aggressor device about the common available carrier.
  • an apparatus comprising at least one processor, and at least one memory including computer program code, the at least one processor, with the at least one memory and the computer program code, being configured to cause the apparatus to at least perform at least one of the methods according to any of the third, fourth, and twelfth to eighteenth aspects.
  • a computer program product comprising a set of instructions which, when executed on an apparatus, is configured to cause the apparatus to carry out the method according to any one of the third, fourth, and twelfth to eighteenth aspects.
  • the computer program product may be embodied on a computer-readable medium.
  • Each of the apparatuses according to the first, second, and fifth to tenth aspects may be comprised by a base station or a cell of a base station.
  • the apparatus according to the eleventh aspect may be comprised by an operation and maintenance system.
  • Each of the methods according to any of the third, fourth, and twelfth to eighteenth aspects may be a method of cell range extension. According to some embodiments of the invention, at least the following advantages are achieved :
  • the feedback of the adopted PDCCH protected carrier (from the aggressor cell) by the victim cell may be used to properly configure the aggressor cell's measurement object.
  • Fig. 1 shows an apparatus according to an embodiment of the invention
  • Fig. 2 shows a method according to an embodiment of the invention
  • Fig. 3 shows an apparatus according to an embodiment of the invention
  • Fig. 4 shows a method according to an embodiment of the invention
  • Fig. 5 shows a basic usage exemplification
  • Fig. 6 shows a scenario exemplification
  • Fig. 7 shows an apparatus according to an embodiment of the invention
  • Fig. 8 shows a method according to an embodiment of the invention
  • Fig. 9 shows an apparatus according to an embodiment of the invention
  • Fig. 10 shows a method according to an embodiment of the invention
  • Fig. 11 shows an apparatus according to an embodiment of the invention
  • Fig. 12 shows a method according to an embodiment of the invention
  • Fig. 13 shows an apparatus according to an embodiment of the invention
  • Fig. 14 shows a method according to an embodiment of the invention
  • Fig. 15 shows an apparatus according to an embodiment of the invention
  • Fig. 16 shows a method according to an embodiment of the invention
  • Fig. 17 shows an apparatus according to an embodiment of the invention
  • Fig. 18 shows a method according to an embodiment of the invention
  • Fig. 19 shows an apparatus according to an embodiment of the invention
  • Fig. 20 shows a method according to an embodiment of the invention. Detailed description of certain embodiments
  • DL ABS Status IE is only targeted for the time domain ICIC but does not consider the impact of different UE capabilities.
  • a presence or non-presence of a capability of the UE for CRS interference cancellation is taken into account for scheduling a downlink from the victim cell to the UE.
  • an extended PRB ratio may be used to determine the configuration of extension carrier and ABS/LP-ABS in normal carrier of aggressor cell in order to maximize the spectral utilization. Details of the extended PRB ratio are explained further below.
  • Different UE may have or not have a capability of CRS interference cancellation.
  • the capability may depend on the release of the UE:
  • release 11 UEs are capable to do CRS interference cancellation, e.g. by an advanced receiver, hence they may be scheduled in ABS subframe of normal carrier with acceptable performance; as an example, if the interference cancellation capable UE is aware of the PCI and antenna port information of the aggressor cell(s), then its receiver can effectively remove the CRS interference to the data RE in the victim cell.
  • extension carrier is defined as a carrier where no CRS is transmitted, thus it is free from the CRS interference.
  • the extended PRB ratio may be semi-statically (e.g. periodically, potentially with a relatively long period) reported by the victim cell to the aggressor cell, and/or the extended PRB ratio may be evaluated by the victim cell and reporting may be triggered if a certain value of the extended PRB ratio is reached.
  • clear channel designates a carrier that is configured as normal carrier at the victim cell but as an extension carrier at the aggressor cell.
  • eNB#l denote the aggressor cell e!MB
  • eNB#2 denote the victim cell eNB;
  • eNB #2 differentiates its served UEs according to the level of interference they are affected by. For example, it may differentiate between weakly affected UEs and more than weakly effect UEs. In another example, eNB#2 differentiates its served UE as the strongly interfered UE and moderately interfered UE as well as the weakly interfered UE. The differentiation may be based on the RSRP that is signaled to eNB #2 by the respective UE.
  • o PDCCH of Rll UE is preferred be sent in clear channel while PDSCH of Rll UE is preferred be sent in LP-ABS of normal channel;
  • PDSCH of Rll UE is preferred be sent in ABS of normal channel.
  • Rl l UE designate release 11 UEs
  • the principle of these embodiments may be applied to UEs of other releases, too, as long as they are distinguished according to their capability of CRS interference cancellation.
  • the following metrics of an extended PRB ratio PRB occupation is applied and reported from the victim cell to the aggressor cell :
  • PRB occupation indicates the percentage of data channel resource blocks of clear channel, wherein
  • the defined metric may be an average percentage value of all the clear carriers, or a separate indication for each clear channel may be given. If the aggressor cell is aware of the respective denominators (number of all the available PRBs %), it is sufficient if the victim cell reports at least one of the enumerators (number of PRBs scheduled %) to the aggressor cell. Thus, it may report the respective enumerators or ratios or both.
  • the victim reports the extended PRB ratio (PRB occupation) of the UEs classified not to be capable of CRS interference cancellation.
  • the reporting can be triggered by the el ⁇ IB#2 periodically or aperiodicaily based on some predefined events, e.g. upon the PRB occupationl and/or 2 is higher or lower than some predetermined thresholds.
  • the aggressor eNB #1 determines whether the currently allocated extension carrier and/or ABS/LP-ABS resource is appropriate. That is, eNB#l makes a decision on whether to reconfigure extension carrier and/or ABS/LP-ABS subframe in its normal carrier to maximize the spectral utilization, by taking into account the extended PRB ratio.
  • eNB #l may be as follows:
  • eNB#l shall consider to add more extension carriers to lead to more clear channels at eNB#2; Instead of a sum, another appropriately defined combined value such as a product of the ratios may be checked. Vice versa, if the combined value (e.g. sum) is less than a threshold ⁇ ', a clear channel may be removed, ⁇ may be the same as ⁇ ' . Though, in order to avoid rapid fluctuation of the configuration, it is preferable that ⁇ ' ⁇ ⁇ (hysteresis).
  • eNB#l shall consider adding more ABSs in its normal carrier, rather than increasing the number of extension carrier, and vice versa.
  • the number of ABSs and LP-ABSs in the normal carrier may be determined based on the feedback of PRB utilization of Rll UE that are respectively strongly interfered and medium interfered.
  • the above mentioned procedure may be modified in that eNB#2 first evaluates the extended PRB ratio, formulates the corresponding request (e.g. add an extension carrier) and then reports to eNB#l requesting its final decision along with the local information of eNB#l.
  • eNB#2 first evaluates the extended PRB ratio, formulates the corresponding request (e.g. add an extension carrier) and then reports to eNB#l requesting its final decision along with the local information of eNB#l.
  • the eNB#2 shall do the scheduling of its served UE according to the above mentioned principles.
  • extended PRB ratio PRB occupation 1 and PRB occupation 2
  • the configuration of the extension carrier as well as the allocation of ABS/LP-ABS subframe in the normal carrier may be determined.
  • extended PRB ratio one can configure the minimal number of required extension carriers when the carrier resource is limited, while ensuring that the system performance is satisfied. If, in some embodiments, medium interfered UEs are not distinguished from strongly interfered UEs, ABS and LP-ABS may be jointly considered as blank subframes, and, hence, PRB occupation 1 may coincide with PRB occupation 2.
  • three exemplary ways to implement the extended PRB ratio are outlined. Modifications over the present standards are underlined.
  • ABS Status IE is used to aid the eNB designating ABS to evaluate the need for modification of the ABS pattern, a new IE may be included in the ABS status.
  • Implementation option 1 is to add new IE in the load information: Presence Range IE type Semantics Critical! Assigned and description ty Criticality reference
  • Implementation option 3 is to add new message:
  • Fig. 1 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a base station such as a NodeB or eNodeB, or a part thereof.
  • the apparatus comprises at least one processor 10, and at least one memory 20 including computer program code, wherein the at least one processor 10, with the at least one memory 20 and the computer program code, being configured to cause the apparatus to at least perform one of the methods shown in Fig. 2.
  • Fig. 2 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 1 may perform the method of Fig. 2 but is not limited to this method.
  • the method of Fig. 2 may be performed by the apparatus of Fig. 1 but is not limited to being performed by this apparatus.
  • a terminal having at least a downlink communication is classified according to its capability for reference signal interference cancellation, e.g. by an advanced receiver. More in detail, it is classified into one of a cancellation category and a non-cancellation category, wherein the cancellation category indicates that the terminal is capable of reference signal interference cancellation, and the non-cancellation category indicates that the terminal is not capable thereto.
  • step SI 10 it is assessed whether the terminal is affected by interference caused by an aggressor device by more than a first interference level.
  • Steps SlOO and S110 may be interchanged or performed simultaneously.
  • step S110 If it is assessed in step S110 that the first terminal is affected by more than the first interference level and in step SlOO that the terminal is classified into the non-cancellation category, a blank slot of a ciear carrier is scheduled for the downlink communication of the terminal (S120).
  • step S110 If it is assessed in step S110 that the first terminal is affected by more than the first interference level and in step 100 that the first terminal is classified into the cancellation category, a blank slot of a normal carrier is scheduled for the downlink communication (S130).
  • the scheduling in steps S120 and S130 is based on a carrier information received from the aggressor device.
  • the clear carrier is comprised by one or more extension carriers of the aggressor device.
  • the scheduling in steps S120 and S130 is based on a slot information received from the aggressor device.
  • the slot information the blank slots are of one of an almost blank slot type (corresponding to ABS on a subframe level instead of a slot level) and a blank slot with reduced power type (corresponding to LP-ABS on a subframe level instead of a slot level).
  • Fig. 3 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a base station such as a NodeB or elModeB, or a part thereof.
  • the apparatus comprises at least one processor 50, and at least one memory 60 including computer program code, wherein the at least one processor 50, with the at least one memory 60 and the computer program code, being configured to cause the apparatus to at least perform one of the methods shown in Fig. 4.
  • Fig. 4 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 3 may perform the method of Fig. 4 but is not limited to this method.
  • the method of Fig. 4 may be performed by the apparatus of Fig. 3 but is not limited to being performed by this apparatus.
  • step S210 transmitting a reference signal such as a CRS on a carrier of an extension carrier type is suppressed. That is, if the apparatus performing the method configures a carrier as one of an extension carrier type, a reference signal is not transmitted on this carrier.
  • a first carrier is configured to be of the extension carrier type.
  • one or more blank slots are deployed on the first carrier.
  • the blank slots are of one of an almost blank slot type (corresponding to ABS on a subframe level instead of a slot level) and a blank slot with reduced power type (corresponding to LP-ABS on a subframe level instead of a slot level).
  • it is checked if an indication from a victim device is received that indicates that a total ratio exceeds a predetermined threshold.
  • the total ratio is a ratio of a number of physical resource blocks in blank slots on the first carrier scheduled for downlink communication of terminals by the victim device to a total number of physical resource blocks in blank slots on the first carrier, wherein only terminals of a non-canceflation category are considered.
  • a second carrier different from the first carrier is configured to be of the extension carrier type (S250).
  • S250 extension carrier type
  • FIG.5 One of the basic usage illustrations [5] of PDCCH protected carriers in a HetNet scenario is shown in Fig.5.
  • a terminal UE1 is connected to a macro cell
  • a terminal UE2 is connected to a pico-cell within the coverage area of the macro cell.
  • CCl is configured as normal carrier carrying the PDCCH and PDSCH 1
  • CC2 is configured as PDCCH protected carrier, not carrying the PDCCH but PDSCH2.
  • the configuration is just opposite: CC2 is configured as normal carrier carrying the PDCCH and PDSCH2, and CCl is configured as PDCCH protected carrier not carrying the PDCCH but PDSCH1.
  • Different elSIBs may configure different CCs as PDCCH protected carrier.
  • the PDCCH protected carrier can be associated to a backward compatible carrier for utilization.
  • Highly interfered UEs in victim cell are preferred to be scheduled in the normal carrier of victim cell (I.e. which is the PDCCH muted carrier for the aggressor cell). In this way, the interfered UE in victim cell can be i. free from interference from PDCCH transmissions from aggressor cell
  • FIG. 6 shows a scenario with multiple macro cells (in Fig. 6 exemplarily: two macro cells, Macro cell 1 and Macro cell 2) interfering with one pico cell (Pico cell 1).
  • Pico cell 2 is shown which is affected by interference from Macro cell 2 only.
  • a PDCCH protected carrier is defined as a carrier that is configured as ordinary carrier at victim cell and as PDCCH muted carrier at aggressor cell.
  • Pico cell 1 will receive multiple PDCCH protected carrier patterns from the associated macro cells.
  • An PDCCH protected carrier pattern means an indication which of the carriers are configured as PDCCH protected carriers and which are not. Since conventionally Macro cells 1 and 2 do not coordinate their PDCCH protected carrier patterns, it is possible that there is no common subset among those PDCCH protected carrier patterns. Consequently, there is no appropriate PDCCH protected carrier for the pico UEs in the CRE area of this specific pico cell to do data transmission.
  • the PDCCH protected carriers are configured differently for pico UEs (here: UEs attached to Pico cell 1) that are located in the overlapping area with macro cell 1 and 2 respectively, pico UEs that migrate from the CRE area of macro cell 1 to the CRE area of macro cell 2 have to change its PDCCH protected carrier.
  • the PDCCH protected carrier at macro cell 1 may even potentially be configured as PCC. Such a change of the PDCCH protected carrier would therefore be at least unreasonable.
  • the pico cell 1 is located between macro cells 1 and 2.
  • carrier 2 is PDCCH protected carrier configuration in macro cell 1
  • carrier 2, 3 are PDCCH protected carriers in macro cell 2
  • a common set of PDCCH protected carriers comprising carrier 2 is available.
  • carrier 2 (only) is PDCCH protected carrier of macro cell 1
  • carriers 1 and 3 (only) are PDCCH protected carriers in macro cell 2
  • there is no joint PDCCH protected carrier i.e. no carrier is suitable for the pico UE in CRE zone to use. In this case, there will be interference from one macro cell for the corresponding PDCCH protected carrier pattern of the other one, and both the data transmission and the measurement will be greatly impacted.
  • a pico UE even in the absence of joint interference from multiple macro elMBs for the pico UE in pico cell 1, it is not preferred for a pico UE to switch its carrier when it migrates from one side of the pico cell (interfered by macro cell 1) to the other side of the pico ceil (interfered by macro cell 2) in the CRE zone of pico cell 1. According to embodiments of the invention, it is ensured that a common subset of PDCCH protected carriers of the multiple interfering macro cells exists. In some embodiments, the usab!e PDCCH protected carriers of the pico cell are sent to the macro cell in order to facilitate a proper configuration of the macro's measurement subset.
  • one or more of the following solutions is employed in order to ensure the existence of a common subset of PDCCH protected carriers of the multiple macro cells interfering simultaneously with a pico cell.
  • the multiple macro cells interfering with the pico cell are also named neighboring macro cells.
  • Solution #1 Neighbouring macro elMBs negotiate with each other directly.
  • the pico cell may inform the pico cell (victim) about their agreed common available carrier, that is the carrier that is agreed to be a PDCCH protected carrier of all the neighbouring macro eNBs.
  • Solution #2 Neighbouring macros negotiate via the the affected pico cell.
  • the macros cells may send a set of candidate PDCCH protected carrier patterns to the affected pico cell.
  • o Pico may propose an acceptable common set for all neighbouring macros; For example, it may check if there is a set of carriers being configured as PDCCH protected carriers in all macro cells and select these carriers. If this is not the case, it may select some carriers to be an PDCCH protected carrier of all the affecting macro cells, e.g. based on some radio parameters of the carriers such as RSRQ, RSRP etc..
  • the pico cell informs the affecting macro cells of the selection.
  • OAM configuration ensures that a 'common subset' exists between the PDCCH protected carrier patterns of those interfering cells, o
  • OAM may provide the exact PDCCH protected carrier or a common PDCCH protected carrier pattern for macro eNBs,
  • the macro eNBs may determine the PDCCH protected carrier pattern for pico based on the guidance from OAM.
  • the macro eNBs may inform the pico cell (victim) about the configured PDCCH protected carrier(s).
  • a consistency check may be implemented in the OAM to ensure that there is a common PDCCH protected carrier pattern for the adjacent macro cells.
  • pico eNB gives a feedback about its actually used (usable) PDCCH protected carriers, i.e., adopted PDCCH protected carriers from macro cells. It may give a feedback on the measurement subset to the macro eNB, too.
  • a PDCCH protected carrier Information IE is included in the LOAD INFORMATION message, wherein a PDCCH protected carrier Pattern Info IE indicates the carriers designated as PDCCH protected carriers by or protected from strong inter-cell interference for the sending eNB for the purpose of interference coordination.
  • the receiving eNB may take such information into consideration when scheduling UEs or making a proper decision for its own PDCCH protected carrier pattern.
  • the LOAN INFORMATION message may comprise Measurement Subset IE, which the receiving eNB may use for the configuration of specific measurements towards the UE.
  • the receiving eNB considers the received information as immediately applicable.
  • the receiving eNB shall consider the value of the PDCCH protected carrier Information IE valid until reception of a new LOAD INFORMATION message carrying an update. However, in some embodiments, this information may be associated to a time when it becomes active/inactive.
  • the pico cell may provide this information periodically or triggered by some events.
  • the information may be requested from one of the macro ceils.
  • an Invoke Indication IE may be included in the LOAD INFORMATION message, which indicates which type of information the sending eNB would like the receiving eNB to send back.
  • the receiving eNB may take such request into account.
  • the Invoke Indication IE is set to "PDCCH protected carrier Information"
  • it indicates that the sending eNB would like the receiving eNB to initiate the Load Indication procedure with the LOAD INFORMATION message containing the PDCCH protected carrier Information IE indicating PDCCH protected carrier patterns in the relevant aggressor/victim cells.
  • the format of notification may be the carrier bitmap or the actual carrier identification, e.g., EARFCN and bandwidth indication.
  • one or both of the macro and the pico UE may be informed about their neighbour pico cells' PDCCH protected carrier pattern.
  • pico cell 2 is a neighbour pico cell for pico eel! 1 and macro cell 2. This information may be used to configure and perform the measurement to its neighbour pico cells. The information may be conveyed by dedicated signaling, e.g. using measurement object.
  • This IE may provide information about the carrier(s) the sending eNB has configuring as PDCCH protected carriers, and/or which subset of PDCCH protected carriers are recommended for configuring measurements towards the UE.
  • the new parts over the present standard definitions are underlined.
  • Table 1 implementation example 1 of PDCCH protected carrier information
  • the new IE may be comprised in the load information:
  • Pattern Info fSIZE(40i) bitmap represents a
  • PDCCH protected carrier information may be implemented as a new message compared to the present standard :
  • Table 3 implementation example 3 of PDCCH protected carrier information
  • Fig. 7 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a base station such as a NodeB or eNodeB, or a part thereof.
  • the apparatus comprises at least one processor 300, and at least one memory 305 including computer program code, wherein the at least one processor 300, with the at least one memory 305 and the computer program code, being configured to cause the apparatus to at least perform one of the methods shown in Fig. 8.
  • Fig. 8 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 7 may perform the method of Fig. 8 but is not limited to this method.
  • the method of Fig. 8 may be performed by the apparatus of Fig. 7 but is not limited to being performed by this apparatus.
  • step S310 an indication of one or more carriers of a plurality of carriers to be candidates of an PDCCH protected carrier type of a first aggressor device is received from the first aggressor device.
  • step S320 an indication of one or more carriers of the plurality of carriers to be candidates of the PDCCH protected carrier type of a second aggressor device is received from the second aggressor device.
  • the first aggressor device may be different from the second aggressor device.
  • the indications may comprise an PDCCH protected carrier pattern. Steps S310 and S320 may be interchanged or performed simultaneously.
  • the apparatus negotiates with the first aggressor device and the second aggressor device on a common available carrier of the plurality of carriers to be of the PDCCH protected carrier type of both the first aggressor ; device and the second aggressor device.
  • the apparatus selects the common available carrier (S340). For example, it may select a carrier that is comprised in the candidate sets of both aggressor devices. Alternatively, e.g. if there is no carrier in both candidate sets, it may select one based on some radio measurements.
  • step S350 the selected common available carrier is indicated to the first aggressor device and the second aggressor device in order to instruct them to configure the common available joint carrier to be of the PDCCH protected carrier type.
  • Fig. 9 shows an apparatus according to an embodiment of the invention.
  • the : apparatus may be a base station such as a NodeB or eNodeB, or a part thereof.
  • the apparatus comprises at least one processor 400, and at least one memory 405 including computer program code, wherein the at least one processor 400, with the at least one memory 405 and the computer program code, being , configured to cause the apparatus to at least perform one of the methods shown in Fig. 10.
  • Fig. 10 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 9 may perform the method of Fig. 10 but is not limited to this method.
  • the method of Fig. 10 may be performed by the apparatus of Fig. 9 but is not limited to being performed by this apparatus.
  • the apparatus monitors if there is a common available carrier indicated by a first aggressor device and a second aggressor device different from the first aggressor device. Then, according to step S420, it selects and informs at least one of the aggressor devices about the common available carrier such that they are caused to configure the common available carrier as a
  • step S430 a terminal is scheduled on the selected common available carrier.
  • Fig. 11 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a base station such as a NodeB or eNodeB, or a part thereof.
  • the apparatus comprises at least one processor 500, and at least one memory
  • the at least one processor 500 with the at least one memory 505 and the computer program code, being configured to cause the apparatus to at least perform one of the methods shown in Fig. 12.
  • Fig. 12 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 11 may perform the method of Fig. 12 but is not limited to this method.
  • the method of Fig. 12 may be performed by the apparatus of Fig. 11 but is not limited to being performed by this apparatus.
  • step 510 one or more candidate carriers of a plurality of carriers are selected as candidates for a PDCCH protected carrier type of the apparatus.
  • a victim device is informed about the candidate carriers (S520).
  • an indicated carrier of the plurality of carriers is configured to be of the PDCCH protected carrier type based on an indication received from the victim device, which means at least that transmitting control signal on the configured PDCCH protected carrier is suppressed (S540).
  • Fig. 13 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a base station such as a NodeB or eNodeB, or a part thereof.
  • the apparatus comprises at least one processor 600, and at least one memory 605 including computer program code, wherein the at least one processor 600, with the at least one memory 605 and the computer program code, being configured to cause the apparatus to at least perform one of the methods shown in Fig. 14.
  • Fig. 14 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 13 may perform the method of Fig. 14 but is not limited to this method.
  • the method of Fig. 13 may be performed by the apparatus of Fig. 14 but is not limited to being performed by this apparatus.
  • step 610 one or more candidate carriers of a plurality of carriers are selected as candidates for a PDCCH protected carrier type of the apparatus.
  • An aggressor device is informed about the candidate carriers (S620).
  • step S630 the apparatus agrees with the aggressor device on a common available carrier of the plurality of carriers which is to be of the PDCCH protected carrier type of both the apparatus and the aggressor device.
  • the common available carrier is configured to be of the PDCCH protected carrier type, which means at least that transmitting control signal on the common available carrier is suppressed (S650).
  • Fig. 15 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a base station such as a NodeB or eNodeB, or a part thereof.
  • the apparatus comprises at least one processor 700, and at least one memory 705 including computer program code, wherein the at least one processor 700, with the at least one memory 705 and the computer program code, being configured to cause the apparatus to at least perform one of the methods shown in Fig. 16.
  • Fig. 16 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 15 may perform the method of Fig. 16 but is not limited to this method.
  • the method of Fig. 15 may be performed by the apparatus of Fig. 16 but is not limited to being performed by this apparatus.
  • a victim device is informed about common available carrier(s).
  • the common available carriers are indicated in a message received from an OAM system and are indicated as suitable to be PDCCH protected carriers.
  • the common available carrier is configured to be of the PDCCH protected carrier type, which means at least that transmitting: control signal on the common available carrier is suppressed (S730).
  • Fig. 17 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a base station such as a NodeB or eNodeB, or a part thereof.
  • the apparatus comprises at least one processor 800, and at least one memory 805 including computer program code, wherein the at least one processor 800, with the at least one memory 805 and the computer program code, being configured to cause the apparatus to at least perform one of the methods shown in Fig. 18.
  • Fig. 18 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 17 may perform the method of Fig. 18 but is not limited to this method.
  • the method of Fig. 17 may be performed by the apparatus of Fig. 18 but is not limited to being performed by this apparatus.
  • step S810 it is decided to configure a measurement of a terminal operatively connected to the apparatus.
  • an information received from a victim device about one or more common available carriers that may bea subset of the usable carriers is taken into account. Accordingly, in step S820, the measurement of the terminal is configured.
  • Fig. 19 shows an apparatus according to an embodiment of the invention.
  • the apparatus may be a OAM such as an OAM processor or OAM center, or a part thereof.
  • the apparatus comprises at least one processor 900, and at least one memory 905 including computer program code, wherein the at least one processor 900, with the at least one memory 905 and the computer program code, being configured to cause the apparatus to at least perform one of the methods shown in Fig. 20.
  • Fig. 20 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 19 may perform the method of Fig. 20 but is not limited to this method.
  • the method of Fig. 19 may be performed by the apparatus of Fig. 20 but is not limited to being performed by this apparatus.
  • step S910 it is checked if both one or more first carriers of a plurality of carriers and one or more second carriers of the plurality of carriers comprise a common available carrier.
  • the first carriers are potential candidates to be of an PDCCH protected carrier type of a first aggressor device
  • the second carriers are potential candidates to be of the PDCCH protected carrier type of a second aggressor device different from the first aggressor device.
  • step S920 the common available carrier is selected to be a candidate of the PDCCH protected carrier type of both the first aggressor device and the second aggressor device.
  • step S930 at least one of the first and second aggressor devices is informed about the common available carrier, in order to cause the aggressor device to configure the common available carrier to be a PDCCH protected type.
  • the control signal in the embodiments of Figs. 7 to 20 may be a PDCCH signal.
  • Some embodiments of the invention are described with respect to subframes and some with respect to slots, wherein a subframe comprises one or more slots. Since the embodiments of the invention are not sensitive whether they are applied to a slot or a subframe, a reference to a subframe may be replaced by one to a slot (including a single slot) and vice versa. That is, each embodiment described for a subframe may be applied to a slot and each embodiment described for a slot may be applied to a subframe.
  • Embodiments of the invention are described based on an LTE-A system but embodiments of the invention may be applied to other radio access technologies such as LTE, WiFi, WLAN, UMTS, HSPA, if extension carriers and blank frames are foreseen.
  • a device may be a user equipment, a terminal, a mobile phone, a laptop, a smartphone, a tablet PC, or any other device that may attach to the mobile network.
  • a base station may be for example a NodeB, an eNodeB or any other base station of a radio network.
  • exemplary embodiments of the present invention provide, for example a victim apparatus such as a base station or a cell of a base station or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product(s).
  • exemplary embodiments of the present invention provide, for example an aggressor apparatus such as a base station or a cell of a base station or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product(s).
  • exemplary embodiments of the present invention provide, for example an operation apparatus such as a OAM center or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums , carrying such computer program(s) and forming computer program product(s).
  • a system may; comprise any conceivable combination of the thus depicted devices/apparatuses and other network elements, which are configured to cooperate with any one of them.
  • any structural means such as a processor or other circuitry may refer to one or more of the following : (a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and (b) combinations of circuits and software (and/or firmware), such as (as applicable) : (i) a combination of processor(s) or (ii) portions of processor(s)/software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • any procedural step or functionality is suitable to be implemented as software/firmware or by hardware without changing the idea of the present invention.
  • Such software may be software code independent and can be specified using any known or future developed programming language, such as e.g. Java, C++, C, and Assembler, as long as the functionality defined by the method steps is preserved.
  • Such hardware may be hardware type independent and can be implemented using any known or future developed hardware technology or any hybrids of these, such as MOS (Metal Oxide Semiconductor), CMOS (Complementary MOS), BiMOS (Bipolar MOS), BiCMOS (Bipolar CMOS), ECL (Emitter Coupled Logic), TTL (Transistor-Transistor Logic), etc., using for example ASIC (Application Specific IC (Integrated Circuit)) components, FPGA (Field-programmable Gate Arrays) components, CPLD (Complex Programmable Logic Device) components or DSP (Digital Signal Processor) components.
  • MOS Metal Oxide Semiconductor
  • CMOS Complementary MOS
  • BiMOS Bipolar MOS
  • BiCMOS BiCMOS
  • ECL Emitter Coupled Logic
  • TTL Transistor-Transistor Logic
  • ASIC Application Specific IC
  • FPGA Field-programmable Gate Arrays
  • CPLD Complex Programmable Logic Device
  • DSP
  • a device/apparatus may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of a device/apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution/being run on a processor.
  • a device may be regarded as a device/apparatus or as an assembly of more than one device/apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing, for example.
  • Apparatuses and/or means or parts thereof can be implemented as individual, devices, but this does not exclude that they may be implemented in a distributed fashion throughout the system, as long as the functionality of the device is preserved. Such and similar principles are to be considered as known to a skilled person.
  • Software in the sense of the present description comprises software code as such comprising code means or portions or a computer program or a computer program product for performing the respective functions, as well as software (or a computer program or a computer program product) embodied on a tangible; medium such as a computer-readable (storage) medium having stored thereon a respective data structure or code means/portions or embodied in a signal or in a chip, potentially during processing thereof.
  • the present invention also covers any conceivable combination of method steps and operations described above, and any conceivable combination of nodes, apparatuses, modules or elements described above, as long as the above- described concepts of methodology and structural arrangement are applicable.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention porte sur un procédé qui consiste à classifier un premier terminal ayant au moins une communication en liaison descendante avec un appareil exécutant le procédé dans l'une d'une catégorie d'annulation et d'une catégorie de non annulation, la catégorie d'annulation indiquant que le premier terminal peut annuler le brouillage de signal de référence ; à évaluer si un brouillage, causé par un dispositif agresseur par un niveau de brouillage supérieur à un premier niveau de brouillage, a une incidence sur le premier terminal ; s'il est évalué que le premier terminal est perturbé par plus que le premier niveau de brouillage et que le terminal est classifié dans la catégorie de non annulation, à planifier un premier créneau vide d'une porteuse nette pour la communication en liaison descendante, et s'il est évalué que le premier terminal est perturbé par plus que le premier niveau de brouillage et que le premier terminal est classifié dans la catégorie d'annulation, à planifier un second créneau vide d'une porteuse normale pour la communication en liaison descendante, la planification se faisant en fonction d'informations de porteuse reçues en provenance du dispositif agresseur selon lesquelles la porteuse nette est constituée par une ou plusieurs porteuses d'extension du dispositif agresseur et en fonction d'informations de créneau reçues du dispositif agresseur selon lesquelles chacun des premier et second créneaux vides est d'un type parmi un type de créneau presque vide et un type de créneau vide à puissance réduite.
PCT/CN2012/078739 2012-07-17 2012-07-17 Améliorations apportées à des réseaux hétérogènes WO2014012214A1 (fr)

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US10638498B2 (en) 2015-02-27 2020-04-28 At&T Intellectual Property I, L.P. Frequency selective almost blank subframes

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