WO2014110783A1 - Coordination du brouillage intercellulaire et interliaison dans la communication duplex par répartition dans le temps souple - Google Patents

Coordination du brouillage intercellulaire et interliaison dans la communication duplex par répartition dans le temps souple Download PDF

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Publication number
WO2014110783A1
WO2014110783A1 PCT/CN2013/070662 CN2013070662W WO2014110783A1 WO 2014110783 A1 WO2014110783 A1 WO 2014110783A1 CN 2013070662 W CN2013070662 W CN 2013070662W WO 2014110783 A1 WO2014110783 A1 WO 2014110783A1
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WIPO (PCT)
Prior art keywords
cell
transmission power
time division
division duplex
flexible subframe
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PCT/CN2013/070662
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English (en)
Inventor
Lili Zhang
Chunyan Gao
Haiming Wang
Jing HAN
Wei Hong
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Broadcom Corporation
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Priority to PCT/CN2013/070662 priority Critical patent/WO2014110783A1/fr
Publication of WO2014110783A1 publication Critical patent/WO2014110783A1/fr

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/27Control channels or signalling for resource management between access points
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446Resources in time domain, e.g. slots or frames
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Definitions

  • the present invention relates to inter-cell cross-link interference coordination in flexible time division duplex communication. More specifically, the present invention relates to measures (including methods, apparatuses and computer program products) for realizing inter-cell cross-link interference coordination in flexible time division duplex communication, such as e.g. in layered heterogeneous network deployments.
  • TDD Time Division Duplex
  • UL-DL uplink-downlink
  • TDD is currently utilized in various communication systems, including wireless and/or cellular communication systems, e.g. LTE and LTE-A systems.
  • LTE/LTE-A the same TDD (UL-DL) configuration in each cell is assumed, since otherwise interference between UL and DL, including both base station-to-base station (e.g. eNB-to-eNB) interference and terminal-to-terminal (e.g. UE-to-UE) interference, arises and needs to be considered especially in neighboring cells.
  • base station-to-base station e.g. eNB-to-eNB
  • terminal-to-terminal e.g. UE-to-UE
  • adopting the same UL-DL configuration in each cell is typically inadequate in cellular communication systems. This is because different traffic situations in different (including neighboring) cells could most appropriately be handled by different UL-DL configurations, i.e.
  • LA local area
  • traffic adaptation a differently distributed allocation of the available resources to UL and DL communications.
  • LA local area
  • traffic adaptation a differently distributed allocation of the available resources to UL and DL communications.
  • the typical cell size is small in comparison with a typical (macro) cell and the number of terminals connected to each base station in the network is not large, there is an increased possibility that the traffic situation in different LA cells may only be adequately handled by different UL-DL configurations.
  • inter-cell cross-link interference DL-UL interference and UL-DL interference
  • inter-cell cross-link interference UL-DL interference
  • neighboring cells perform traffic adaptation by selecting UL-DL configurations in which at least one (flexible) subframe is assigned for different link directions, such inter-cell cross-link interference could occur for this at least one subframe.
  • HetNet heterogeneous network
  • inter-cell interference coordination While various measures for inter-cell interference coordination have been proposed for cellular communication system, such measures apply to interference for the same link direction, i.e. UL-UL interference and DL-DL interference only.
  • corresponding measures for inter-cell interference coordination for HetNet deployments include power control based on 01 (overload indication) and/or HII (high interference indication) signaling between eNBs, handover, and elCIC (enhanced inter-cell interference coordination) based on ABS (almost blank subframe) configuration.
  • CA carrier aggregation
  • elCIC solutions improve the performance of the same frequency HetNet deployments.
  • a method comprising setting up a time division duplex communication in a cell of a cellular communication system on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein at least one flexible subframe is configured for one of a downlink and an uplink communication, and issuing an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in the at least one flexible subframe.
  • a method comprising obtaining, from a cell of a cellular communication system, an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in at least one flexible subframe of an uplink-downlink configuration in said cell, and setting up a time division duplex communication in said target cell on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein the at least one flexible subframe is configured for one of an uplink and a downlink communication, on the basis of the obtained interference indication signaling.
  • 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 perform : setting up a time division duplex communication in a cell of a cellular communication system on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein at least one flexible subframe is configured for one of a downlink and an uplink communication, and issuing an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in the at least one flexible subframe.
  • 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 perform : obtaining, from a cell of a cellular communication system, an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in at least one flexible subframe of an uplink-downlink configuration in said cell, and setting up a time division duplex communication in said target cell on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein the at least one flexible subframe is configured for one of an uplink and a downlink communication, on the basis of the obtained interference indication signaling.
  • an apparatus comprising means for setting up a time division duplex communication in a cell of a cellular communication system on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein at least one flexible subframe is configured for one of a downlink and an uplink communication, and means for issuing an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in the at least one flexible subframe.
  • an apparatus comprising means for obtaining, from a cell of a cellular communication system, an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in at least one flexible subframe of an uplink-downlink configuration in said cell, and means for setting up a time division duplex communication in said target cell on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein the at least one flexible subframe is configured for one of an uplink and a downlink communication, on the basis of the obtained interference indication signaling.
  • a computer program product comprising a set of instructions (e.g . computer-executable computer program code) which, when executed on an apparatus or a computer of an apparatus (e.g . an apparatus according to any one of the aforementioned apparatus-related exemplary aspects of the present invention), is arranged/configured to cause the computer or apparatus to carry out the method according to any one of the aforementioned method-related exemplary aspect of the present invention.
  • a set of instructions e.g . computer-executable computer program code
  • Such computer program product may for example comprise or be embodied as a (tangible) computer-readable (storage) medium or the like on which the computer-executable computer program code is stored, and/or the program may be directly loadable into an internal memory of the computer or a processor thereof.
  • a target/receiving cell i.e. an interfering base station
  • a source/initiating cell i.e. an interfered base station
  • the target/receiving cell i.e. the interfering base station
  • enhancements are achieved by methods, apparatuses and computer program products enabling/realizing inter-cell cross-link interference coordination in flexible TDD communication .
  • Such enhancements generally contribute to enhancements to interference management and traffic adaptation (e!MTA).
  • e!MTA interference management and traffic adaptation
  • Figure 1 shows a diagram illustrating an example of a procedure according to exemplary embodiments of the present invention
  • Figure 2 shows a diagram illustrating another example of a procedure according to exemplary embodiments of the present invention
  • Figure 3 shows a diagram illustrating still another example of a procedure according to exemplary embodiments of the present invention.
  • Figure 4 shows a schematic block diagram illustrating exemplary apparatuses according to exemplary embodiments of the present invention.
  • the following description of the present invention and its embodiments mainly refers to specifications being used as non-limiting examples for certain exemplary network configurations and deployments. Namely, the present invention and its embodiments are mainly described in relation to 3GPP specifications being used as non-limiting examples for certain exemplary network configurations and deployments.
  • a LTE/LTE-A system is used as a non-limiting example of a cellular communication system .
  • the description of exemplary embodiments given herein specifically refers to terminology which is directly related thereto. Such terminology is only used in the context of the presented non-limiting examples, and does naturally not limit the invention in any way. Rather, any other network configuration or system deployment, etc. may also be utilized as long as compliant with the features described herein.
  • the present invention and its embodiments may be applicable in any cellular communication system (of homogeneous or heterogeneous deployment type) in which flexible TDD communication is applicable, which could cause inter-cell cross-link interference coordination. More specifically, the present invention and its embodiments are generally applicable to enhancements to interference management and traffic adaptation (elMTA) in such systems.
  • elMTA interference management and traffic adaptation
  • the resource allocations which may be realized by these specified UL-DL configurations, provide between 40% and 90% of DL subframes, i.e. DL capacity.
  • these specified UL-DL configurations are shown, wherein D indicates a DL subframe, U indicates an UL subframe, and S indicates a special subframe.
  • DL-UL (cross-link) interference is one obstacle to deploy flexible TDD cellular systems, e.g . TDD LA cellular systems in which improved resource and power efficiency would be expected thereby.
  • TDD LA TDD LA cellular systems
  • their link direction can change with the TDD U L-DL configuration, and there can be DL-UL (cross-link) interference depending on the TDD U L-DL configuration adopted in neighboring cells.
  • those subframes (like subframes 0, 1, 2 and 5) having a fixed link direction are referred to as fixed subfram e, while those subframes having a variable link direction are referred to as flexible subfram e.
  • subframes 0, 1, 2 and 5 are always fixed subframes in any arrangement
  • the fixed and flexible subframes can change depending on which ones of the TDD U L-DL configurations are (allowed to be) adopted by neighboring cells. For example, if a network only supports TDD U L-DL configurations 1 and 2, then subframes 0, 1, 2, 4, 5, 6, 7, 9 are all fixed subframes, while subframes 3 and 8 are flexible subframes which are set as UL in configuration 1 and as DL in configuration 2. Accordingly, inter-cell UL-DL (cross-link) interference may be present for flexible subframes being used for different link directions in neighboring cells.
  • a first base station denoted as eNBl is assumed to represent a serving communication control entity of a first cell which is assumed as an initiating or source cell in terms of inter-cell cross-link interference coordination
  • a second base station denoted as eNB2 is assumed to represent a serving communication control entity of a second cell which is assumed as a receiving or target cell in terms of inter-cell cross-link interference coordination.
  • the first and second cells could both represent macro (high power) cells, or the first cell could represent a macro (high power) cell and the second cell could represent a micro pico or femto (low power) cell, or vice versa.
  • a signaling communication between the two base stations could be accomplished via an X2 interface, especially as a radio network layer signaling of the control plane in the framework of an X2 application protocol.
  • both base stations are configured with a TDD (UL-DL) configuration out of a predefined set of predefined TDD (UL-DL) configurations as exemplified above. That is, both cells are configured according to traffic adaptation or the like.
  • the first cell or base station eNBl and the second cell or base station eNB2 are configured with TDD (UL-DL) configurations in which one or more flexible subframes are assigned to different link directions.
  • flexible subframes addressed in the following could be assigned for DL in/for the first cell or base station eNBl and for UL in/for the second cell or base station eNB2.
  • Figure 1 shows a diagram illustrating an example of a procedure according to exemplary embodiments of the present invention.
  • a procedure according to exemplary embodiments of the present invention may comprise the following operations.
  • the first base station eNBl performs flexible TDD communication setup, i.e. sets up a TDD communication in the first cell on the basis of the preconfigured TDD (UL-DL) configuration, wherein at least one flexible subframe is configured for one of a DL and an UL communication.
  • the first base station eNBl issues an interference indication signaling comprising a target cell identifier (target cell ID) identifying a target cell for inter-cell cross-link interference coordination with the first cell in the at least one flexible subframe.
  • target cell ID target cell identifier
  • Such signaling could be broadcast or multicast to all/multiple neighboring cells or base stations with respect to the first cell or base station.
  • the second base station eNB2 obtains this interference indication signaling from the first base station eNB2.
  • the target cell identifier exemplarily identifies the second cell or base station eNB2 as the target cell
  • the second base station eNB2 processes/utilizes this interference indication signaling, while all other cells or base stations obtaining this interference indication signaling ill ignore such information.
  • the second base station eNB2 processes/utilized this information in performing flexible TDD communication setup, i.e.
  • the at least one flexible subframe sets up a TDD communication in the second cell on the basis of the preconfigured TDD (UL-DL) configuration, wherein the at least one flexible subframe is configured for the other one of a DL and an UL communication (i.e. for a cross-link communication with respect to the first base station), on the basis of the (information the) interference indication signaling.
  • UL-DL preconfigured TDD
  • the first base station eNBl may determine the target cell for inter-cell cross-link interference coordination as a cell in which the at least one flexible subframe is configured for the other one of the DL and the UL communication. Such target cell determination may be based on (information on) TDD (UL-DL) configurations for flexible TDD communications in neighboring cells of the first cell and (measurement results of) inter-cell cross-link interference in the at least one flexible subframe. That is, the first base station eNBl may determine a target cell in which interference in at least one flexible subframe with cross-link direction assignment, i.e. inter-cell cross-link interference due to flexible TDD communication (i.e. usage of flexible TDD configurations), is most significant.
  • inter-cell cross-link interference coordination in flexible TDD communication may be accomplished between interfering cells or base stations by way of the interference indication signaling comprising a target cell identifier (target cell ID) identifying a target cell for inter-cell cross-link interference coordination, which is issued by the first cell or base station, and which is used for TDD communication setup in the second cell or base station, wherein at least one flexible subframe is configured for different link directions in/for the two cells or base stations.
  • target cell ID target cell identifier
  • the flexible TDD communication setup may comprise both power control and scheduling .
  • the first base station eNBl may set a DL transmission power for the set-up TDD communication in the at least one flexible subframe and schedule (a specific set of) terminals served in the first cell for the DL communication in one or more resource blocks (PRB) in the at least one flexible subframe with the set DL transmission power.
  • the second base station may set an UL transmission power for the set-up TDD communication in the at least one flexible subframe and schedule (a specific set of) terminals served in the second cell for the UL communication in the same one or more resource blocks (PRB) in the at least one flexible subframe with the set UL transmission power.
  • the inter-cell cross-link interference coordination may be accomplished by way of resource coordination between cells or base stations interfering due to flexible TDD communication (i.e. usage of flexible TDD configurations).
  • an initiating base station may send an interference indication with an appropriate target cell ID tagging so that a receiving base station of the target cell, assigned e.g. for UL in at least one flexible subframe, could identify relevant UEs for inter-cell cross-link interference coordination and henceforth achieve an appropriate scheduling and e.g . UL power control for these UEs in terms of flexible TDD communication setup.
  • the interference indication which triggers coordination with the target eNB, includes the target cell ID.
  • the interference indication may include an indication of reserved PRBs (in which case the target eNB may limit its UE scheduling for these reserved PRBs) and/or an indication of transmission power, i.e. power levels/thresholds according to a list of options of the pre-defined/pre-specified power levels/thresholds, e.g . similar to an RNTP level.
  • the interference indication may be signaled in the context of load management/indication, e.g . by means of a LOAD INFORMATION message.
  • LOAD INFORMATION message may be sent by an eNB to neighboring eNBs to transfer load and interference coordination information, and may for example exhibit the following or a similar format, in which M represents mandatory presence and O represents optional presence, while the references relate to corresponding sections in the standard specification 3GPP TS 36.423 Vl l .3.0 (2012-12).
  • the interference indication signaling could comprise a transmission power indication containing the target cell identifier, which indicates a resource utilization in terms of transmission power for the TDD communication in the at least one flexible subframe in the first cell .
  • the RNTP information element may for example exhibit the following or a similar format, in which M represents mandatory presence and O represents optional presence.
  • This information element may provide an indication on DL power restriction per PRB in a cell and other information needed by a neighbor eNB for interference aware scheduling .
  • Value 0 indicates "Tx not exceeding RNTP threshold”.
  • Value 1 indicates "no promise on the Tx power is given"
  • RNTP Threshold M ENUMERATE RNTPthreshoid is defined in TS
  • the interference indication signaling could comprise a cross-link interference indication containing the target cell identifier, which indicates an interference for the TDD communication in the at least one flexible subframe in the first cell.
  • the CII information element may for example exhibit the following or a similar format, in which M represents mandatory presence and O represents optional presence.
  • This information element may provide, per PRB, a report on interference overload of a specific subframe. 1 E/ Group Nam e Pre-s Range I E type & Semantics description ence reference
  • Each PRB is identified by its Overload Indication (high position in the list: the first interference, element in the list medium corresponds to PRB 0, the interference, low second to PRB 1, etc.
  • the target cell identifier may for example be represented in the form of an E-UTRAN Cell Global ID (ECGI).
  • ECGI E-UTRAN Cell Global ID
  • a procedure in terms of load management
  • eNBl assigning flexible subframes in DL and eNB2 assigning the same flexible subframes in UL in TDD configurations may run as follows.
  • the eNBl initiates and sends an enhanced RNTP indication (i.e. an RNTP IE) including the target cell ID (e.g. eNB2) to the eNB2 to indicate its PRB resource utilization in the flexible subframes. Thereby, it indicates, per PRB, whether DL transmission power is lower than the value indicated by the RNTP Threshold value. For these addressed PRBs, it shall schedule its UEs located close to the border between (the cells of) eNBl and eNB2 and perform the DL communication to these UE with corresponding DL transmission power. Upon receiving the RNTP indication, the eNB2 shall take such information into account for scheduling its UEs in UL transmission for the addressed PRBs with corresponding UL transmission power.
  • an enhanced RNTP indication i.e. an RNTP IE
  • the target cell ID e.g. eNB2
  • the eNB2 may only schedule UEs located not close to the border between (the cells of) eNBl and eNB2, or schedule UEs located close to this border but far away from the eNBl (e.g . farer than from the eNB2) by taking into account the indicated power levels/thresholds.
  • Other eNBs not corresponding to the target cell shall ignore such information and schedule their UEs without restriction from the addressed PRBs.
  • Figure 2 shows a diagram illustrating another example of a procedure according to exemplary embodiments of the present invention.
  • a procedure according to exemplary embodiments of the present invention may comprise the following operations in addition to the operations discussed above in connection with Figure 1.
  • the first base station eNBl issues, to the target cell, a request for an indication of a suggested transmission power preference for the TDD communication in the at least one flexible subframe from the target cell .
  • the second base station eNB2 (as the base station of the target cell) derives a suggested transmission power preference on the basis of at least one of transmission powers for the TDD communication in the at least one flexible subframe in the first cell and the second cell .
  • the second base station eNB2 issues the requested indication including the derived suggested transmission power preference to the first cell, i.e. the first base station eNBl .
  • the first base station eNBl Upon obtaining the requested indication from the second base station eNB2, the first base station eNBl resets a transmission power for the TDD communication in the at least one flexible subframe (e.g . the DL transmission power and/or threshold, potentially per PRB) on the basis of the suggested transmission power preference indicated by the second cell .
  • the thus reset transmission power may be further utilized in the flexible TDD communication in the first cell .
  • the second base station eNB2 may also utilize the derived suggested transmission power preference for the first cell for resetting a transmission power for the TDD communication in the second cell in the at least one flexible subframe (e.g. the UL transmission power and/or threshold, potentially per PRB) on the basis thereof.
  • the thus reset transmission power may be further utilized in the flexible TDD communication in the second cell as well .
  • the sequence of operations, as illustrated in Figure 2 is only illustrative, and exemplary embodiments of the present invention are not limited thereto.
  • the transmission power preference request may be signaled by the eNBl in connection with or right after the interference indication signaling, and the eNB2 may derive the suggested transmission power preference and/or signal the corresponding indication before or during performing the flexible TDD communication setup
  • transmission power resetting may comprise an evaluation of the need for modification of previously set transmission power on the basis of the suggested transmission power preference, and a corresponding modification in case of the evaluation of the need thereof.
  • the transmission power may relate to at least one of transmission power level and transmission power threshold for the TDD communication in the at least one flexible subframe.
  • the transmission power preference request/indication may be signaled in the context of resource status reporting.
  • the corresponding request may be signaled e.g . by means of a RESOURCE STATUS REQUEST message, and/or the corresponding indication may be signaled e.g . by means of a RESOURCE STATUS RESPONSE message
  • An applicable RESOURCE STATUS REQUEST message may be sent by an eNB to neighboring eNBs to initiate a requested measurement according to the parameters given in the message, and may for example exhibit the following or a similar format, in which M represents mandatory presence and O represents optional presence, while the references relate to corresponding sections in the standard specification 3GPP TS 36.423 Vl l .3.0 (2012-12).
  • 1 E/ Group Name Pre-s Ran1
  • a sixth bit in the Report Characteristics information element may be utilized for the transmission power preference request according to exemplary embodiments of the preset invention.
  • a periodic provision of the requested indication of the suggested transmission power preference is requested, while a single provision thereof might be equally requested, as the case may be.
  • the cell identifier in the Cell ID information element in the illustrated example format preferably corresponds to the target cell identifier (as contained e.g . in the RNTP/CII IE mentioned above).
  • the suggested transmission power preference is requested from the target cell for inter-cell cross-link interference coordination.
  • the transmission power preference request/indication may be signaled in the context of resource status reporting.
  • the corresponding request may be signaled e.g . by means of a RESOURCE STATUS REQUEST message, and/or the corresponding indication may be signaled e.g . by means of a RESOURCE STATUS RESPONSE message
  • An applicable information element for indicating the suggested transmission power preference from the second cell to the first cell may for example exhibit one of the following formats or the like, in which M represents mandatory presence and O represents optional presence.
  • Such power level preference indication IE may be used to aid the eNB, i.e. the source eNB, in designing enhanced RNTP or CII to evaluate the need for modification of the power level/threshold .
  • the power level preference indication IE may be constructed as follows or similar.
  • the indication of the suggested transmission power preference comprises a power preference indication in flexible subframes, wherein the indicated power preference is applicable to flexible subframes.
  • a receiving eNB may send suggested RNTP power levels/thresholds over an inter-eNB interface to the initiating eNB for addressed flexible subframes.
  • the power level preference indication IE may be constructed as follows or similar.
  • the indication of the suggested transmission power preference comprises a power preference indication and a subframe indication indicating whether the indicated power preference is applicable to flexible subframes or fixed subframes.
  • a receiving eNB may send suggested RNTP power levels/thresholds over an inter-eNB interface to the initiating eNB as a separate signaling .
  • Such separate signaling can be combined with (responsive to) both 01 (UL Interference Overload Indication) and HII (UL High Interference Information) as transported in the context of the interference indication signaling, e.g . in the LOAD INFORMATION message above.
  • 01 UL Interference Overload Indication
  • HII UL High Interference Information
  • a procedure in terms of resource status reporting may run as follows.
  • the eNB2 may suggest an appropriate transmission power level/threshold to the eNBl through power level preference indication.
  • a power level preference indication in flexible subframes may be directly employed to feedback its suggestion, or the subframe indication of power level preference indication may me marked .
  • the eNBl shall adjust the power level/threshold accordingly. Further, it may send an updated enhanced RNTP or CII, so that the eNB2 may update and use the updated valid value for the local scheduling (as indicated in Figure 3).
  • Figure 3 shows a diagram illustrating still another example of a procedure according to exemplary embodiments of the present invention.
  • a procedure according to exemplary embodiments of the present invention may comprise the following operations in addition to the operations discussed above in connection with Figure 2.
  • the first base station eNBl after resetting the transmission power, issues an updated interference indication signaling to the second base station eNB2. Namely, the first base station updates its judgment on (the need of) inter-cell cross-link interference coordination with the target cell on the basis of the reset transmission power, and informs the second base station eNB2 accordingly.
  • the second base station may reset the transmission power in the second cell accordingly or, stated in other words, utilize this information for the flexible TDD communication (e.g . in terms of scheduling).
  • the second base station eNB2 may consider the obtained updated interference indication signaling and/or the previously or newly derived suggested transmission power preference for the first cell.
  • the updated interference indication signaling may be similar in type and/or format as the (initial) interference indication signaling described above in connection with Figure 1. That is, the updated interference indication signaling may be signaled in the context of load management/indication, e.g . by means of a LOAD INFORMATION message, as exemplified above. More specifically, a corresponding RNTP and/or CII IE may be utilized for the updated interference indication signaling, as exemplified above.
  • the updated interference indication signaling could comprise an updated transmission power indication containing the target cell identifier, which indicates a resource utilization in terms of transmission power for the TDD communication in the at least one flexible subframe in the first cell in accordance with the reset transmission power.
  • the updated interference indication signaling could comprise an updated cross-link interference indication containing the target cell identifier, which indicates an interference for the TDD communication in the at least one flexible subframe in said cell in accordance with the reset transmission power.
  • exemplary embodiments of the present invention enable inter-cell cross-link interference coordination in flexible TDD communication.
  • a target/receiving cell i.e. an interfering base station
  • a source/initiating cell i.e. an interfered base station
  • the target/receiving cell i.e. the interfering base station
  • a target cell identifier is beneficially included in an interference indication signaling (e.g . in RNTP and/or CII elements).
  • a parallel UL/DL transmission may be kept in a minimum distance of neighboring cells to the maximum extent, i.e. as far as possible.
  • This is achieved in that only a target cell for inter-cell cross-link interference coordination is caused to adapt its flexible TDD communication accordingly.
  • the eNBl can indicate that it shall schedule the UEs located in the overlapping area between (the cells of) eNBl and eNB2. Then, the eNB2 shall limit its UEs located in the overlapping area between (the cells of) eNBl and eNB2 e.g. in the UL transmission for the addressed resource. Otherwise, all neighboring eNBs would need to respond to this, which would cause some unnecessary resource restriction.
  • the source eNB in DL sends RNTP or CII without a target cell ID, it cannot accomplish the optimal resource utilization. All the surrounding eNBs would need to be limited by this restriction or take into account the same.
  • the target cell ID tagging it implicitly indicates that eNBl will schedule the UEs located close to the border between (the cells of) eNBl and eNB2, and thus only eNB2 limit its UE UL transmission for those UEs located close to the border between (the cells of) eNBl and eNB2, while other eNBs are free from such restriction, which improves the resource utilization.
  • a transmission/interference power indication may be beneficially used in the interference indication signaling (e.g. in RNTP and/or CII elements).
  • the interference indication signaling e.g. in RNTP and/or CII elements.
  • cross-link operation is more sensitive to the interference, thus enabling a more precise adjustment/coordination.
  • eNBl in DL sends CII to eNB2 in UL
  • the DL->UL eNB interference is reduced .
  • UL->DL interference would be relevant to the UE position.
  • the different UE location with respect to eNB2 will affect the UL-> DL UE interference with respect to eNBl .
  • a corresponding transmission/interference power indication is effective. While CII transmission with a power level indication can tell the exact interference level to the target eNB to get precise adjustment, a feedback by the target eNB on the preferred transmission power level/threshold may facilitate a more appropriate transmission power set in flexible subframes.
  • exemplary embodiments of the present invention provide for an enhancement of e/ICIC solutions in flexible TDD communication, which enables improved resource utilization. Specifically, it is facilitated to convey information on the inter-cell cross-link interference due to flexible TDD configuration in neighboring cells, and to distinguish this interference from UL-UL and DL-DL interference.
  • inter-cell cross-link interference can be avoided or at least reduced/mitigated efficiently via resource coordination between the source/initiating/interfered cell and the target/ receiving/interfering cell.
  • the above-described procedures and functions may be implemented by respective functional elements, processors, or the like, as described below.
  • the solid line blocks are basically configured to perform respective operations as described above.
  • the entirety of solid line blocks are basically configured to perform the methods and operations as described above, respectively.
  • the individual blocks are meant to illustrate respective functional blocks implementing a respective function, process or procedure, respectively.
  • Such functional blocks are implementation-independent, i.e. may be implemented by means of any kind of hardware or software, respectively.
  • the arrows and lines interconnecting individual blocks are meant to illustrate an operational coupling there-between, which may be a physical and/or logical coupling, which on the one hand is implementation-independent (e.g. wired or wireless) and on the other hand may also comprise an arbitrary number of intermediary functional entities not shown.
  • Figure 4 shows a schematic block diagram illustrating exemplary apparatuses according to exemplary embodiments of the present invention.
  • any one of the illustrated apparatuses 10 and 20 corresponds to an entity which may represent a (part of a) base station of a cellular communication system such as an eNB of a LTE/LTE-A system or the like, or a corresponding modem (which may be installed as part thereof, but may be also a separate module, which can be attached to various devices, as described above).
  • the illustrated apparatuses 10 and 20 may both relate to a base station of macro (high power) cells. Otherwise, the one of the illustrated apparatuses 10 and 20 may relate to a base station of a macro (high power) cell while the other one of the illustrated apparatuses 10 and 20 may relate to a base station of a micro pico or femto (low power) cell, or vice versa .
  • the individual apparatuses and a system comprising the same is equally applicable in any homogeneous and (layered) heterogeneous network deployment. Any one of them may be configured to perform a procedure and/or functionality of eNBl or eNB2, as described in conjunction with any one of Figures 1 to 3.
  • any apparatus may comprise a processing system .
  • Such processing system may comprise at least one processor and at least one memory including computer program code, and (possibly) at least one interface configured for communication with at least another apparatus.
  • each of the apparatuses may comprise a processor 11/21, a memory 12/22 and an interface 13/23, which are connected by a bus 14/24 or the like, and the apparatuses may be connected via a corresponding link, interface or connection 30, respectively.
  • the processor 11/21 and/or the interface 13/23 may be facilitated for communication over a (hardwire or wireless) link, respectively.
  • the interface 13/23 may comprise a suitable receiver or a suitable transmitter-receiver combination or transceiver, which is coupled to one or more antennas or communication means for (hardwire or wireless) communications with the linked or connected device(s), respectively.
  • the interface 13/23 is generally configured to communicate with another apparatus, i.e. the interface thereof.
  • the memory 12/22 may store respective programs assumed to include program instructions or computer program code that, when executed by the respective processor, enables the respective electronic device or apparatus to operate in accordance with the exemplary embodiments of the present invention.
  • the respective devices/apparatuses (and/or parts thereof) may represent means for performing respective operations and/or exhibiting respective functionalities, and/or the respective devices (and/or parts thereof) may have functions for performing respective operations and/or exhibiting respective functionalities.
  • processor or some other means
  • the processor is configured to perform some function
  • this is to be construed to be equivalent to a description stating that at least one processor, potentially in cooperation with computer program code stored in the memory of the respective apparatus, is configured to cause the apparatus to perform at least the thus mentioned function.
  • function is to be construed to be equivalently implementable by specifically configured means for performing the respective function (i.e. the expression "processor configured to [cause the apparatus to] perform xxx-ing” is construed to be equivalent to an expression such as "means for xxx-ing").
  • the apparatus 10 relates to eNBl in Figures 1 to 3, the apparatus 10 or its processor 11 (or a processing system thereof) according to exemplary embodiments of the present invention is configured to perform setting up a time division duplex communication in a cell of a cellular communication system on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein at least one flexible subframe is configured for one of a downlink and an uplink communication, and issuing an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in the at least one flexible subframe.
  • the apparatus 20 relates to eNB2 in Figures 1 to 3, the apparatus 20 or its processor 21 (or a processing system thereof) according to exemplary embodiments of the present invention is configured to perform obtaining, from a cell of a cellular communication system, an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in at least one flexible subframe of an uplink-downlink configuration in said cell, and setting up a time division duplex communication in said target cell on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein the at least one flexible subframe is configured for one of an uplink and a downlink communication, on the basis of the obtained interference indication signaling.
  • an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in at least one flexible subframe of an uplink-downlink configuration in said cell, and setting
  • a system may comprise any conceivable combination of the thus depicted devices/apparatuses and other network elements, which are configured to cooperate as described above.
  • respective functional blocks or elements according to above-described aspects can be implemented by any known means, either in hardware and/or software, respectively, if it is only adapted to perform the described functions of the respective parts.
  • the mentioned method steps can be realized in individual functional blocks or by individual devices, or one or more of the method steps can be realized in a single functional block or by a single device.
  • 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. Also, it may also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware, any integrated circuit, or the like.
  • any procedural step or functionality is suitable to be implemented as software 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, system in package, 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.
  • the present invention and/or exemplary embodiments thereof provide measures for inter-cell cross-link interference coordination in flexible time division duplex communication, such as e.g. in layered heterogeneous network deployments.
  • Such measures may exemplarily comprise measures for setting up a time division duplex communication in a cell of a cellular communication system on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein at least one flexible subframe is configured for one of a downlink and an uplink communication, issuing an interference indication signaling comprising a target cell identifier identifying a target cell for inter-cell cross-link interference coordination with said cell in the at least one flexible subframe, and setting up a time division duplex communication in said target cell on the basis of an uplink-downlink configuration out of a set of predefined uplink-downlink configurations with flexible subframe patterns for flexible time division duplex communication, wherein the at least one flexible subframe is configured for the one
  • E-UTRAN base station E-UTRAN base station

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention a trait à des mesures destinées à la coordination du brouillage intercellulaire et interliaison dans la communication duplex par répartition dans le temps (TDD) souple, par exemple dans les déploiements de réseaux hétérogènes en couches. Ces mesures peuvent inclure par exemple des mesures servant : à mettre en place une communication duplex par répartition dans le temps dans une cellule d'un système de communication cellulaire, sur la base d'une configuration liaison montante-liaison descendante faisant partie d'une série de configurations liaison montante-liaison descendante prédéfinies dotées de schémas de secteurs de trame souples pour la communication duplex par répartition dans le temps souple, au moins un secteur de trame souple étant configuré pour une communication de liaison descendante (DL) ou une communication de liaison montante (UL) ; à émettre une signalisation indiquant le brouillage qui comprend un identifiant de cellule cible identifiant une cellule cible pour la coordination du brouillage intercellulaire et interliaison avec ladite cellule dans le ou les secteurs de trame souples ; et à mettre en place une communication duplex par répartition dans le temps dans ladite cellule cible sur la base d'une configuration liaison montante-liaison descendante faisant partie d'une série de configurations liaison montante-liaison descendante prédéfinies dotées de schémas de secteurs de trame souples pour la communication duplex par répartition dans le temps souple, le ou les secteurs de trame souples étant configurés pour la communication de liaison descendante ou la communication de liaison montante, conformément à la signalisation indiquant le brouillage.
PCT/CN2013/070662 2013-01-18 2013-01-18 Coordination du brouillage intercellulaire et interliaison dans la communication duplex par répartition dans le temps souple WO2014110783A1 (fr)

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US10917223B2 (en) 2016-10-04 2021-02-09 Samsung Electronics Co., Ltd. Apparatus and method for interference management in wireless communication system
CN108293190A (zh) * 2016-11-01 2018-07-17 达闼科技(北京)有限公司 资源调配方法、调配系统、计算机程序产品及通信设备
CN108293190B (zh) * 2016-11-01 2022-03-11 达闼科技(北京)有限公司 资源调配方法、调配系统、计算机程序产品及通信设备
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CN110089182A (zh) * 2017-03-17 2019-08-02 联发科技股份有限公司 灵活双工中的跨链路干扰减轻技术
CN108632968A (zh) * 2017-03-24 2018-10-09 华为技术有限公司 用于上行功率控制的方法和装置
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WO2018202032A1 (fr) * 2017-05-05 2018-11-08 中兴通讯股份有限公司 Appareil et procédé de transmission de données, support d'informations et processeur
CN108811120B (zh) * 2017-05-05 2023-05-02 中兴通讯股份有限公司 数据传输方法及装置
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WO2018228584A1 (fr) * 2017-06-16 2018-12-20 Mediatek Inc. Co-conception de signal de référence de sondage et de signal de référence d'informations d'état de canal dans des communications mobiles
TWI696372B (zh) * 2017-06-16 2020-06-11 聯發科技股份有限公司 干擾測量方法及裝置
CN112236964A (zh) * 2018-06-04 2021-01-15 诺基亚技术有限公司 NR TDD无线电帧配置和CLI灵敏度的gNB Xn间信令
CN112237039A (zh) * 2018-06-05 2021-01-15 上海诺基亚贝尔股份有限公司 用于交叉链路干扰测量的资源配置
CN112237039B (zh) * 2018-06-05 2024-04-05 上海诺基亚贝尔股份有限公司 用于交叉链路干扰测量的资源配置
US20210321417A1 (en) * 2018-08-10 2021-10-14 Lg Electronics Inc. Method and apparatus for measuring remote cross-link interference
US11864217B2 (en) * 2018-08-10 2024-01-02 Lg Electronics Inc. Method and apparatus for measuring remote cross-link interference

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