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WO2014166066A1 - Détection de brouillage utilisant un préambule d'accès aléatoire dédié - Google Patents

Détection de brouillage utilisant un préambule d'accès aléatoire dédié Download PDF

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Publication number
WO2014166066A1
WO2014166066A1 PCT/CN2013/073975 CN2013073975W WO2014166066A1 WO 2014166066 A1 WO2014166066 A1 WO 2014166066A1 CN 2013073975 W CN2013073975 W CN 2013073975W WO 2014166066 A1 WO2014166066 A1 WO 2014166066A1
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WIPO (PCT)
Prior art keywords
interference
network communication
communication entity
random access
access preamble
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PCT/CN2013/073975
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English (en)
Inventor
Pengfei Sun
Lili Zhang
Wei Bai
Chunyan Gao
Jing HAN
Haiming Wang
Na WEI
Wei Hong
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Broadcom Corp
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Broadcom Corp
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Priority to PCT/CN2013/073975 priority Critical patent/WO2014166066A1/fr
Publication of WO2014166066A1 publication Critical patent/WO2014166066A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel

Definitions

  • the present invention relates to interference detection using a dedicated random access preamble. More specifically, the present invention relates to measures (including methods, apparatuses and computer program products) for enabling/realizing interference detection using a dedicated random access preamble, such as e.g. in layered heterogeneous network deployments.
  • ICIC measures for interference coordination and interference cancellation in LTE/LTE-A systems.
  • uplink interference may for example be addressed, which a mobile terminal being served by a first base station (i.e. in a first cell) could cause to a second base station (i.e. in a second cell).
  • HetlMet layered heterogeneous network
  • macro high power
  • micro micro, pico or femto (low power) cells
  • CA-ICIC carrier aggregation ICIC
  • Figure 1 shows a schematic diagram illustrating an example of an uplink interference scenario in a layered heterogeneous network deployment with carrier aggregation.
  • a layered heterogeneous network deployment with carrier aggregation may be configured such that a macro cell, i.e. cell coverage of a macro eNB, overlaps a pico cell, i.e. cell coverage of a pico eNB (wherein a pico cell/eNB is used herein as a non-limiting example of any micro, pico, femto or any other low power cell/eNB).
  • carrier aggregation is adopted such that a mobile terminal MUE (macro user equipment) is being served by the macro eNB using a primary or PCell carrier and/or a secondary or SCell carrier.
  • the MUE As the MUE is located in the vicinity of the pico eNB while being served by the macro eNB, it may (possibly even severely) interfere with the UL quality of the nearby pico eNB.
  • such UL interference at the pico eNB may be caused because the MUE is not aware of the existence of the pico eNB, as the MUE is not able to detect a DL signal of the pico eNB, e.g. since the pico eNB operates in a dormant state in which it monitors UL signals but does not transmit any DL signal.
  • Such UL interference at the pico eNB may be caused because by the asymmetry between DL coverage and UL coverage of the pico eNB, i.e. when the MUE is located at a position outside the DL border and inside the UL border of the pico cell, as illustrated in Figure 1.
  • Such UL interference area (with respect to the pico eNB/cell) can typically be represented as a circled area, the center of which is on the extension line between the macro eNB and the pico eNB.
  • a per UE carrier (PCell/SCell) selection for CB-ICIC is enabled by detecting the MUE in the UL interference area (with respect to the pico eNB/cell) or by detecting the MUE causing UL interference to the pico eNB/cell.
  • a first candidate solution is based on Overload Indication (OI) from the pico eNB to the macro eNB in connection with historical scheduling information in the macro eNB.
  • a second candidate solution is based on the location of MUE (i.e. UE served by macro eNB) and PUE (i.e. UE served by pico eNB) representing a defined UL interfering source area.
  • a third candidate solution is based on uplink channel sounding (i.e.
  • the macro eNB signals the channel sounding configurations of the potentially interfering UEs to the pico eNB so that it can initiate the detection mechanisms, and the UEs perform the channel sounding transmission, and the pico eNB detects the MUE(s) by monitoring the SRS.
  • a fourth candidate solution is based on uplink MUE DMRS sounding detected by non-serving pico eNB, wherein the macro eNB signals to the pico eNB the uplink radio resources allocated to potentially interfering MUEs (in terms of TTI, allocated PRBs, DMRS configuration and possibly other parameters like MUE's Timing Advance, etc.), the pico eNB (which is required to know scheduling information) detects and signals the relevant information back to the macro eNB.
  • a fifth candidate solution is based on MUE sending a random access preamble to be detected by the non-serving pico eNB, wherein the macro eNB selects some MUE/s to perform a non-contention based random access procedure using PRACH resources and preambles known to the macro eNB and the pico eNB, and the pico eNB detects and feedbacks the related signal strength of the received preambles.
  • the aforementioned fifth candidate solution is adopted, in which the uplink interfering source is identified in that the non-serving pico eNB detects a random access preamble which is sent by the MUE.
  • the macro eNB and the pico eNB pre-exchange some dedicated RACH preamble for the purpose of interference detection, i.e. uplink interfering source detection. Then, the macro eNB instructs a RACH procedure based on this dedicated RACH preamble for the suspected macro UE which may cause interference to the pico eNB's UL reception. Te pico eNB could detect the dedicated RACH preamble to see, if there will be interference caused, and report correspondingly so that the macro eNB could identify such interfering macro UE. Besides identifying an interfering macro UE, the proximity of the macro UE to the pico eNB could be detected as well.
  • the pico eNB Upon such detection, the pico eNB knows that a macro UE is within its coverage, and the pico eNB could be woken up from a dormant state, in which it listens to the RACH transmissions of potentially nearby UEs, so as to provide extra capacity, in addition to or as an alternative to performing an ICIC procedure.
  • a method comprising obtaining interference detection assistance information, relating to detection of a dedicated random access preamble which is specified for interference detection, from a network communication entity, detecting reception of the dedicated random access preamble and the received power of the dedicated random access preamble, and determining whether or not an interference-related operation is to be performed based on the obtained interference detection assistance information and the detected received power of the dedicated random access preamble.
  • a method comprising providing interference detection assistance information, relating to detection of a dedicated random access preamble which is specified for interference detection, to a network communication entity, instructing a terminal entity to transmit the dedicated random access preamble, monitoring an interference-related operation performed by the network communication entity, and executing interference detection on the basis of a monitoring result.
  • an apparatus which may e.g.
  • a cellular system such as a small cell of a cellular communication system
  • a cellular system such as a small cell of a cellular communication system
  • the at least one processor with the at least one memory and the computer program code, being arranged/configured to cause the apparatus to perform : obtaining interference detection assistance information, relating to detection of a dedicated random access preamble which is specified for interference detection, from a network communication entity, detecting reception of the dedicated random access preamble and the received power of the dedicated random access preamble, and determining whether or not an interference- related operation is to be performed based on the obtained interference detection assistance information and the detected received power of the dedicated random access preamble.
  • an apparatus comprising (which may e.g. be arranged/configured for use on a terminal side of a cellular system such as a large cell of a cellular communication system) 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 arranged/configured to cause the apparatus to perform : providing interference detection assistance information, relating to detection of a dedicated random access preamble which is specified for interference detection, to a network communication entity, instructing a terminal entity to transmit the dedicated random access preamble, monitoring an interference-related operation performed by the network communication entity, and executing interference detection on the basis of a monitoring result.
  • an apparatus comprising means for obtaining interference detection assistance information, relating to detection of a dedicated random access preamble which is specified for interference detection, from a network communication entity, means for detecting reception of the dedicated random access preamble and the received power of the dedicated random access preamble, and means for determining whether or not an interference-related operation is to be performed based on the obtained interference detection assistance information and the detected received power of the dedicated random access preamble.
  • an apparatus comprising means for providing interference detection assistance information, relating to detection of a dedicated random access preamble which is specified for interference detection, to a network communication entity, means for instructing a terminal entity to transmit the dedicated random access preamble, means for monitoring an interference-related operation performed by the network communication entity, and means for executing interference detection on the basis of a monitoring result.
  • 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 aspects of the present invention.
  • a set of instructions e.g. computer-executable computer program code
  • Such computer program product may 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.
  • Figure 1 shows a schematic diagram illustrating an example of an uplink interference scenario in a layered heterogeneous network deployment with carrier aggregation, for which exemplary embodiments of the present invention are applicable,
  • Figure 2 shows a flowchart illustrating an example of a procedure, which is operable at a serving network communication entity, according to exemplary embodiments of the present invention
  • Figure 3 shows a flowchart illustrating an example of a procedure, which is operable at a non-serving network communication entity, according to exemplary embodiments of the present invention
  • Figure 4 shows a signaling diagram illustrating a first example of an interference detection procedure according to exemplary embodiments of the present invention
  • Figure 5 shows a signaling diagram illustrating a second example of an interference detection procedure according to exemplary embodiments of the present invention.
  • Figure 6 shows a schematic block diagram illustrating exemplary apparatuses according to exemplary embodiments of the present invention. Description of exemplary embodiments
  • 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.
  • 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.
  • 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 wireless and/or cellular communication system (of homogeneous or heterogeneous deployment type) in which an uplink interference scenario at a non-serving network communication entity is conceivable.
  • a dedicated random access preamble such as e.g. in layered heterogeneous network deployments.
  • a pico cell/eNB is used as a non-limiting example of any micro, pico, femto or any other low power cell/eNB.
  • interference detection this may include one or more of interference presence detection, interference level detection, interfering source presence detection, terminal entity presence detection, or the like.
  • Figure 2 shows a flowchart illustrating an example of a procedure, which is operable at a serving network communication entity, according to exemplary embodiments of the present invention.
  • the procedure of Figure 2 may be performed by the macro eNB in the uplink interference scenario according to Figure 1.
  • a procedure according to exemplary embodiments of the present invention may comprise an operation (SI 10) of providing interference detection assistance information, relating to detection of a dedicated random access (ACH) preamble which is specified for interference detection (and/or uplink interfering source detection), to a network communication entity (such as e.g. the pico eNB in the uplink interference scenario according to Figure 1), an operation (S220) of instructing a terminal entity (such as e.g.
  • SI 10 an operation of providing interference detection assistance information, relating to detection of a dedicated random access ( ACH) preamble which is specified for interference detection (and/or uplink interfering source detection)
  • a network communication entity such as e.g. the pico eNB in the
  • the MUE in the uplink interference scenario according to Figure 1) to transmit the dedicated random access (RACH) preamble, an operation (S230) of monitoring an interference- related operation performed by the network communication entity, and an operation (S240) of executing interference detection on the basis of a monitoring result.
  • RACH dedicated random access
  • Figure 3 shows a flowchart illustrating an example of a procedure, which is operable at a non-serving network communication entity, according to exemplary embodiments of the present invention.
  • the procedure of Figure 3 may be performed by the pico eNB in the uplink interference scenario according to Figure 1.
  • a procedure according to exemplary embodiments of the present invention may comprise an operation (S310) of obtaining interference detection assistance information, relating to detection of a dedicated random access (RACH) preamble which is specified for interference detection (and/or uplink interfering source detection), from a network communication entity (such as e.g.
  • RACH dedicated random access
  • FIG. 4 shows a signaling diagram illustrating a first example of an interference detection procedure according to exemplary embodiments of the present invention.
  • the procedure of Figure 4 may be performed in the uplink interference scenario according to Figure 1, and basically corresponds to a combination of the procedures of Figures 2 and 3 at the macro eNB and the pico eNB from a system perspective.
  • interference detection assistance information is provided from the macro eNB to the pico eNB (corresponding to operations S210 and S310). Then, the macro eNB instructs the MUE, which is suspected to cause UL interference to the pico eNB and thus selected by the macro eNB, to transmit the dedicated RACH preamble, i.e. to perform a RACH procedure (corresponding to operation S220), whereupon the MUE transmits the dedicated RACH preamble.
  • the thus transmitted RACH preamble is received at/by the pico eNB, and thus reception of and the received power of the RACH preamble is detected at/by the pico eNB, i.e.
  • the pico eNB determines whether or not an interference-related operation is to be performed based on the obtained interference detection assistance information and the detected received power of the dedicated RACH preamble (corresponding to operation S330). When it is determined in the operation determination that the interference-related operation is to be performed, the corresponding interference-related operation is performed by the pico eNB. In the example of Figure 4, issuance of an interference report to the macro eNB is assumed as a non-limiting example of such interference-related operation for illustrative purposes.
  • the macro eNB After the instruction to the MUE, although not illustrated in Figure 4, the macro eNB starts monitoring an interference-related operation performed by the pico eNB (corresponding to operation S230), and executes interference detection on the basis of a monitoring result (corresponding to operation S230). Accordingly, on the side of the macro eNB, the interference report from the pico eNB may serve to detect an uplink interfering source or UE presence both within a dormant/active (pico) cell.
  • Figure 5 shows a signaling diagram illustrating a second example of an interference detection procedure according to exemplary embodiments of the present invention.
  • the procedure of Figure 5 may be performed in the uplink interference scenario according to Figure 1, and basically corresponds to a combination of the procedures of Figures 2 and 3 at the macro eNB and the pico eNB from a system perspective.
  • a procedure according to exemplary embodiments of the present invention may additionally comprise the following operations/processes. While it is assumed in the procedure of Figure 4 that the dedicated RACH preamble has already been specified in advance, such specification of the dedicated RACH preamble for interference detection (and/or uplink interfering source detection) is firstly accomplished in the procedure of Figure 5 by way of inter-eNB coordination e.g. via an X2 interface. Further, the MUE selection at the macro eNB is explicitly shown in the procedure of Figure 5, in which the macro eNB selects at least one terminal entity, which is suspected to cause UL interference to the pico eNB, to perform a non-contention based random access procedure using PRACH resources and the dedicated RACH preamble.
  • the initiation of a wakeup process at/by the pico eNB i.e. a wakeup from a dormant state without DL signal transmission to an active state with DL signal transmission
  • the pico eNB Upon monitoring at least one of the two exemplary interference-related operations by the pico eNB, the macro eNB performs the interference detection as well as - possibly as part thereof - carrier (PCell/SCell) selection for CB-ICIC.
  • PCell/SCell - carrier
  • the interference report may include at least one of a (absolute or relative) value indicative of the detected received power of the dedicated RACH preamble (at the pico eNB), a value indicative of presence or absence of interference (at the pico eNB), a value indicative of an interference level resulting from the detected received power of the dedicated RACH preamble (at the pico eNB), and a value indicative of presence or absence of a terminal entity in an uplink coverage area of the pico eNB.
  • the value indicative of an interference level may also be mapped to one of several interference levels, such as “no interference”, “medium interference” and “high interference”, or the like.
  • the value indicative of presence or absence of a terminal entity in an uplink coverage area of the pico eNB may mapped to one of several categories such as e.g. "absence”, “presence but poor quality” and “presence with good quality", or the like.
  • the MUE can be detected as uplink interfering source (i.e. occurrence of an uplink interference scenario can be detected), the MUE can be identified as a terminal entity residing within a dormant cell, and (excessive) interference at the pico eNB due to the PUSCH communication from the MUE can be avoided.
  • the pico eNB is informed about one or more parameters assisting in interference detection (which are described in more detail below) using a dedicated RACH preamble.
  • the pico eNB could infer the possible interference and/or interference level, if the MUE performs a PUSCH communication. Then, the pico eNB could decide whether to send an interference report back to the macro eNB (wherein unnecessary reporting overhead in the network is reduced, as the interference report is only sent when needed/appropriate) and/or whether to wake up itself (by way of a local wakeup process initiation or by way of issuing a corresponding wakeup request for itself to the macro eNB, i.e. a request that the macro eNB allows/instructs wakeup of the pico eNB). By such wakeup, additional capacity may be provided, thereby mitigating the uplink interference scenario.
  • the interference detection assistance information may indicate a power level or threshold as a parameter applicable for interference detection assistance at the pico eNB.
  • the interference-related operation may be determined to be performed when the detected received power of the dedicated ACH preamble is larger than the indicated power level or threshold or a power level or threshold based on the indicated power level or threshold.
  • the macro eNB may coordinate with the pico eNB in order to derive and indicate an appropriate power level or threshold.
  • the pico eNB may report the received power (or signal strength) of the received RACH preamble based on the received RACH preamble power and the indicated power level or threshold. Namely, the pico eNB may only issue an interference report to the macro eNB when the received RACH preamble power exceeds the relevant power level or threshold.
  • the indicated power level or threshold may be indicative of a power offset between received power of the dedicated RACH preamble and a PUSCH communication, which is based on a tolerable interference level of PUSCH communication at the micro eNB.
  • the macro eNB may derive the possible power offset of the received RACH preamble and PUSCH power. Assuming that the macro eNB knows the tolerable interference level of the PUSCH communication of the MUE to the pico eNB e.g. through inter- eNB coordination via an X2 interface, the macro eNB may derive the corresponding RACH reception power or RACH detection power threshold on the pico eNB side.
  • the macro eNB may indicate this power level or threshold to the pico eNB e.g. via an X2 interface.
  • the pico eNB could decide whether the received RACH preamble power is high or low in terms of (tolerable) interference at the pico eNB. Consequently, if the pico eNB sends an interference report (e.g. including the signal strength of the received RACH preamble), the macro eNB knows that the MUE will cause (intolerable) interference at the pico eNB when a PUSCH communication is scheduled for this MUE and may thus, for example, avoid or change PUSCH scheduling accordingly.
  • an interference report e.g. including the signal strength of the received RACH preamble
  • the interference detection assistance information (i.e. the power level or threshold 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 the macro eNB to micro, pico or femto 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 3GPP Technical Specification TS 36.423 Vl l .4.0 (2010-03).
  • RACH detection threshold (which is underlined as highlighting) is contained, which may exemplarily be utilized for the above-described indication/s according to exemplary embodiments of the present invention.
  • the indicated power level or threshold may be updated by the macro eNB whenever desired or necessary, e.g. when the macro eNB finds that the received RACH preamble power changes (at the macro eNB and/or the pico eNB). Further, the indicated power level or threshold may be specific for a terminal entity (e.g. MUE), i.e. it may be a single value for all UEs or an UE- specific value. Still further, the indicated power level or threshold may be specific for a cell, i.e. it may be a single value for all (pico) cells or a (pico) cell-specific value. Still further, the indicated power level or threshold may be valid for a predefined or indicated time period or duration.
  • a terminal entity e.g. MUE
  • the indicated power level or threshold may be specific for a cell, i.e. it may be a single value for all (pico) cells or a (pico) cell-specific value. Still further, the indicated power level or threshold may be valid for
  • the determination operation may be performed with respect to the indicated power level or threshold or a power level or threshold based on the indicated power level or threshold, namely the indicated power level or threshold may yield a (finally valid) power level or threshold depending on a specified format of the dedicated RACH preamble, which could be accomplished in that the indicated power level or threshold may be interpreted as different (finally valid) values based on the configured/used dedicated RACH preamble format.
  • the reported received power (or signal strength) value of the detected dedicated RACH preamble may depend on the indicated power level or threshold such that different power level or threshold values may lead to different reported values of the reported received power (or signal strength). Namely, besides an absolute value of the received power (or signal strength), a relative value of the received power (or signal strength) with relation to the indicated power level or threshold (e.g. a ratio or percentage), a difference value between the received power (or signal strength) and the indicated power level or threshold, or the like may be used.
  • the interference report may be triggered only when pre-defined criteria are met, e.g. when the received RACH preamble power exceeds a macro eNB indicated power level or threshold or when the pico eNB considers the interference to be unbearable by itself. In either case, the pico eNB avoids unnecessary reports leading to overhead burden on the backhaul network.
  • the interference detection assistance information may indicate a detection parameter at the network communication entity as a parameter applicable for interference detection assistance at the pico eNB. In such case, the interference-related operation may be determined to be performed on the basis of the indicated detection parameter at the network communication entity.
  • Such detection parameter at the network communication entity may for example be a (general) cell configuration parameter of the macro eNB (or its macro cell).
  • the macro eNB may send the pico eNB appropriate information (which may be UE and/or (macro/pico) cell specific), which may be used at/by the pico eNB for its determination operation.
  • the pico eNB may report the received power (or signal strength) of the received RACH preamble based on the received RACH preamble power and the indicated detection parameter. Namely, the pico eNB (itself determines that it) may issue an interference report to the macro eNB when the detection of the received RACH preamble has a certain relationship with the indicated detection parameter at the network communication entity.
  • the indicated detection parameter may be indicative of a target signal to interference-plus-noise ratio (SINR) for detection of a RACH preamble at the macro eNB, a power offset between received power of the dedicated RACH preamble and PUSCH communication at the macro eNB, or the like.
  • SINR target signal to interference-plus-noise ratio
  • the macro eNB could include its configured target SINR for RACH detection to the pico eNB.
  • the macro eNB may first derive PUSCH and RACH preamble power difference and then indicate this information to the pico eNB e.g. via an X2 interface.
  • the pico eNB could decide whether the received RACH preamble power is high or low in terms of (tolerable) interference at the macro eNB. Consequently, if the pico eNB sends an interference report (e.g. including the signal strength of the received RACH preamble), the macro eNB knows that the MUE will cause (intolerable) interference at the macro eNB when a PUSCH communication is scheduled for this MUE and may thus, for example, avoid or change PUSCH scheduling accordingly.
  • an interference report e.g. including the signal strength of the received RACH preamble
  • the interference detection assistance information (i.e. the detection parameter) 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 the macro eNB to micro, pico or femto 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 3GPP Technical Specification TS 36.423 Vl l .4.0 (2010-03).
  • Referred RACH detection target SINR (which is underlined as highlighting) is contained, which may exemplarily be utilized for the above-described indication/s according to exemplary embodiments of the present invention.
  • the indicated detection parameter may be updated by the macro eNB whenever desired or necessary, e.g. when the macro eNB finds that the received RACH preamble power changes (at the macro eNB and/or the pico eNB). Further, the indicated detection parameter may be specific for a terminal entity (e.g. MUE), i.e. it may be a single value for all UEs or an UE- specific value. Still further, the indicated detection parameter may be specific for a cell, i.e. it may be a single value for all (macro/pico) cells or a (macro/pico) cell-specific value. Still further, the indicated detection parameter may be valid for a predefined or indicated time period or duration.
  • MUE terminal entity
  • the indicated detection parameter may be specific for a cell, i.e. it may be a single value for all (macro/pico) cells or a (macro/pico) cell-specific value. Still further, the indicated detection parameter may be valid for a predefined
  • the interference report may be triggered only when pre-defined criteria are met, e.g. when the received RACH preamble power exceeds a macro eNB indicated power level or threshold or when the pico eNB considers the interference to be unbearable by itself. In either case, the pico eNB avoids unnecessary reports leading to overhead burden on the backhaul network.
  • the interference detection assistance information may indicate at least one of format and content of an interference report to be issued by the pico eNB to the macro eNB and/or at least one rule for determination of performing the interference-related operation at/by the pico eNB. Namely, formats and procedures to reduce unnecessary reporting overhead and/or facilitating uplink interfering source detection and/or UE identification may be indicated by the macro eNB.
  • the reported received power (or signal strength) of the RACH preamble should be mapped to one of several levels, such as “no interference”, “medium interference” and “high interference” instead of using an absolute/relative value, and it may be indicated that, in case of UE presence detection, the received power (or signal strength) level should be one of "absence”, “presence but poor quality” and “presence with good quality”.
  • the pico eNB should utilize the interference detection assistance information and the detected received power of the dedicated RACH preamble for determining whether or not an interference-related operation is to be performed.
  • interference detection using a dedicated random access preamble may be enabled/realized, even in an improved manner, which is for example applicable in layered heterogeneous network deployments.
  • a more accurate interference detection/estimation and/or UE/interferer presence detection/identification is possible at an opposite base station, such as a pico eNB in case of control/indication by a macro eNB.
  • reduced backhaul network (reporting) overhead may be achieved.
  • 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.
  • the direction of arrow is meant to illustrate the direction in which certain operations are performed and/or the direction in which certain data is transferred.
  • Figure 6 shows a schematic block diagram illustrating exemplary apparatuses according to exemplary embodiments of the present invention.
  • the thus illustrated apparatuses 10 and 20 are suitable for use in practicing exemplary embodiments of the present invention, as described herein.
  • any one of the illustrated apparatuses 10 and 20 corresponds to an entity which may represent a (part of a) network communication entity or 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 apparatus 10 may correspond to an entity which may represent a (part of a) network communication entity or base station of a higher/superordinate (logical/network) layer of a heterogeneous cellular communication system such as a large cell base station like the macro eNB in Figure 1.
  • the apparatus 10 may be configured to perform a procedure and/or functionality, as described in conjunction with any one of Figures 2, 4 and 5 (for the macro eNB).
  • the illustrated apparatus 20 may correspond to an entity which may represent a (part of a) network communication entity or base station of a lower/subordinate (logical/network) layer of a heterogeneous cellular communication system such as a small cell base station like the pico eNB in Figure 1.
  • the apparatus 20 may be configured to perform a procedure and/or functionality, as described in conjunction with any one of Figures 3, 4 and 5 (for the pico eNB).
  • the illustrated apparatus 30 corresponds to an entity which may represent a (part of a) terminal entity or user equipment operable in a cellular communication system such as an UE of a LTE/LTE-A system or the like, e.g. MUE in Figure 1.
  • entity which may represent a (part of a) terminal entity or user equipment operable in a cellular communication system such as an UE of a LTE/LTE-A system or the like, e.g. MUE in Figure 1.
  • 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, potentially, at least one interface configured for communication with at least another apparatus or entity).
  • 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 with each other and with a terminal entity represented by the apparatus 30 via a corresponding link, interface or connection I, II and III, 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 interference detection assistance information to be provided or obtained may be stored in the memory 12 and the memory 22, respectively.
  • the respective devices/apparatuses 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.
  • the 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 or its processor 11 is configured to perform providing interference detection assistance information, relating to detection of a dedicated random access preamble which is specified for interference detection, to a network communication entity, instructing a terminal entity to transmit the dedicated random access preamble, monitoring an interference-related operation performed by the network communication entity, and executing interference detection on the basis of a monitoring result.
  • the apparatus 10 at least comprises respective means for providing interference detection assistance information, means for instructing a terminal entity, means for monitoring an interference-related operation, and means for executing interference detection.
  • the apparatus 20 or its processor 21 (possibly together with computer program code stored in the memory 22) is configured to perform obtaining interference detection assistance information, detecting reception of the dedicated random access preamble and the received power of the dedicated random access preamble, and determining whether or not an interference-related operation is to be performed based on the obtained interference detection assistance information and the detected received power of the dedicated random access preamble.
  • the apparatus 20 at least comprises respective means for obtaining interference detection assistance information, means for detecting reception of the dedicated random access preamble and the received power of the dedicated random access preamble, and means for determining whether or not an interference-related operation is to be performed.
  • respective means for obtaining interference detection assistance information means for detecting reception of the dedicated random access preamble and the received power of the dedicated random access preamble, and means for determining whether or not an interference-related operation is to be performed.
  • 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 mtcroprocessor(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 interference detection using a dedicated random access preamble, such as e.g. in layered heterogeneous network deployments.
  • measures may exemplarily comprise measures for providing interference detection assistance information, relating to detection of a dedicated random access preamble which is specified for interference detection, from a first network communication entity to a second network communication entity, detecting reception of the dedicated random access preamble and the received power of the dedicated random access preamble at the second network communication entity, determining whether or not an interference-related operation is to be performed by the second network communication entity based on the obtained interference detection assistance information and the detected received power of the dedicated random access preamble, and executing interference detection on the basis of monitoring of the interference-related operation performed by the second network communication entity at the first network communication entity.

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Abstract

L'invention concerne des mesures de détection de brouillage utilisant un préambule d'accès aléatoire dédié, comme par ex. dans des déploiements de réseaux hétérogènes en couches. De telles mesures peuvent comporter, à titre d'exemple, des mesures visant à transmettre des informations d'aide à la détection de brouillage, relatives à la détection d'un préambule d'accès aléatoire dédié qui est spécifié pour la détection de brouillage, d'une première entité de communication en réseau à une deuxième entité de communication en réseau, à détecter la réception du préambule d'accès aléatoire dédié et la puissance reçue du préambule d'accès aléatoire dédié au niveau de la deuxième entité de communication en réseau, à déterminer si une opération liée au brouillage doit être effectuée par la deuxième entité de communication en réseau sur la base des informations obtenues d'aide à la détection de brouillage et de la puissance reçue détectée du préambule d'accès aléatoire dédié, et à exécuter une détection de brouillage sur la base d'une surveillance de l'opération liée au brouillage effectuée par la deuxième entité de communication en réseau au niveau de la première entité de communication en réseau.
PCT/CN2013/073975 2013-04-09 2013-04-09 Détection de brouillage utilisant un préambule d'accès aléatoire dédié Ceased WO2014166066A1 (fr)

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WO2020108654A1 (fr) * 2018-11-30 2020-06-04 华为技术有限公司 Procédé et appareil de transmission
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