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WO2015188876A1 - Annulation et suppression de brouillage assistées par réseau pour des rapports cqi dans un réseau de communications - Google Patents

Annulation et suppression de brouillage assistées par réseau pour des rapports cqi dans un réseau de communications Download PDF

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Publication number
WO2015188876A1
WO2015188876A1 PCT/EP2014/062407 EP2014062407W WO2015188876A1 WO 2015188876 A1 WO2015188876 A1 WO 2015188876A1 EP 2014062407 W EP2014062407 W EP 2014062407W WO 2015188876 A1 WO2015188876 A1 WO 2015188876A1
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Prior art keywords
communication
connection state
subset
communication network
instruction
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English (en)
Inventor
Mihai Enescu
Timo Erkki Lunttila
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Nokia Solutions and Networks Oy
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Nokia Solutions and Networks Oy
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Priority to PCT/EP2014/062407 priority Critical patent/WO2015188876A1/fr
Publication of WO2015188876A1 publication Critical patent/WO2015188876A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication

Definitions

  • the present invention relates to apparatuses, methods, systems, computer programs, computer program products and computer-readable media usable for cancelling and suppressing interference in a communication network.
  • BS base station
  • CPU central processing unit
  • CQI channel quality indicator
  • CRS cell specific reference signal
  • CSI-RS channel state information reference signal
  • DCI downlink control information
  • eNB evolved node B
  • ePDCCH enhanced physical downlink control channel
  • ID identification, identifier
  • IMR interference measurement resource
  • LTE-A LTE Advanced
  • MBSFN multicast broadcast single frequency network
  • MCS modulation and coding scheme
  • MIMO multiple input multiple output
  • NAICS network assisted interference cancellation and suppression
  • PA power offset value
  • PCI physical cell ID
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • RRC radio resource control
  • TBS transport block size
  • TDD time division duplex
  • VCI virtual cell ID
  • Embodiments of the present invention are related to a communication network in which interference cancellation and interference suppression on the side of a communication element such as a UE is supported by the communication network infrastructure, e.g. by a communication network control element, such as for example a base station or eNB.
  • a communication network control element such as for example a base station or eNB.
  • a method including providing configuration information related to a reporting procedure of a connection state of a communication between a communication element and a communication network, wherein the configuration information indicates at least one association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed; and causing transmission of an instruction for a connection state reporting mode according to an interference characteristic in a current communication situation.
  • an apparatus including at least one processing circuitry, and at least one memory for storing instructions to be executed by the processing circuitry, wherein the at least one memory and the instructions are configured to, with the at least one processing circuitry, cause the apparatus at least: to provide configuration information related to a reporting procedure of a connection state of a communication between a communication element and a communication network, wherein the configuration information indicates at least one association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed; and to cause transmission of an instruction for a connection state reporting mode according to an interference characteristic in a current communication situation.
  • these examples may include one or more of the following features:
  • the interference characteristic in the current communication situation may be determined from at least one of an own measurement of parameters related to the interference characteristic and an external signaling conveying parameters related to the interference characteristic; and, as the instruction for a connection state reporting mode which is caused to be transmitted, an instruction for a connection state reporting mode may be selected on the basis of the determined interference characteristic;
  • the selecting may further comprise comparing the determined interference characteristic and the interference characteristic to be assumed, which is included in the configuration information associated to the instruction for the connection state reporting mode;
  • connection state feedback may be received in response to the instruction caused to be transmitted, the connection state feedback may be processed, and a link adaptation may be performed on the basis of a result of the processing of the connection state feedback;
  • the configuration information may be provided by using a higher layer signaling between the communication element and the communication network;
  • the instruction for the connection state reporting mode may include one of a periodic channel state information reporting mode and an aperiodic channel state information reporting mode;
  • the at least one association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed may be indicated by a mapping of a specific value of a request field used for instructing the connection state reporting mode and a radio resource control signaling indicating a specific characteristic of an interference source or at least one subset of a radio resource control signaling;
  • the interference characteristic to be assumed may be indicated by parameters related to at least one of a receiver type of a communication in the communication network, a transmission mode used in a communication in the communication network, a transmission scheme used in a communication in the communication network, a resource allocation in a communication in the communication network, a parameter subset including at least one of a codebook subset based on an antenna type, a subset of virtual cell identifications, a subset of physical cell identifications, a subset of power offset values, a subset of reference signals, a subset of interference measurement resources, a subset of precoding matrix indicators, a subset of modulations orders, a subset of time division duplex downlink/uplink configurations, a target number of interferers to be canceled and a subset of a radio resource control signaling;
  • the processing may be is implemented in a communication network control element of the communication network, wherein the communication network control element may be configured to control at least one communication cell in which the communication element may be able to communicate with the communication network, wherein the communication element may be one of a communication terminal, a communication device, and a user equipment.
  • a method including obtaining configuration information related to a reporting procedure of a connection state of a communication between a communication element and a communication network, wherein the configuration information indicates at least one association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed; receiving an instruction for a connection state reporting mode; acquiring information related to interference characteristic to be assumed in a current communication situation by using the association; and conducting a communication processing by using the acquired information.
  • an apparatus including at least one processing circuitry, and at least one memory for storing instructions to be executed by the processing circuitry, wherein the at least one memory and the instructions are configured to, with the at least one processing circuitry, cause the apparatus at least: to obtain configuration information related to a reporting procedure of a connection state of a communication between a communication element and a communication network, wherein the configuration information indicates at least one association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed; to receive an instruction for a connection state reporting mode; to acquire information related to interference characteristic to be assumed in a current communication situation by using the association; and to conduct a communication processing by using the acquired information.
  • these examples may include one or more of the following features:
  • the communication processing may include at least one of a connection state reporting processing including calculating a connection state feedback wherein the acquired information related to the interference characteristic to be assumed is used as a basis for the connection state feedback calculation, and causing a transmission of the calculated connection state feedback to the communication network; and a demodulation processing in a predetermined number of subframes following after receiving the instruction for a connection state reporting mode, wherein the acquired information related to the interference characteristic to be assumed is used in the demodulation processing in the predetermined number of subframes.
  • a connection state reporting processing including calculating a connection state feedback wherein the acquired information related to the interference characteristic to be assumed is used as a basis for the connection state feedback calculation, and causing a transmission of the calculated connection state feedback to the communication network
  • a demodulation processing in a predetermined number of subframes following after receiving the instruction for a connection state reporting mode wherein the acquired information related to the interference characteristic to be assumed is used in the demodulation processing in the predetermined number of subframes.
  • the configuration information may be obtained from a higher layer signaling between the communication element and the communication network;
  • the instruction for the connection state reporting mode may include one of a periodic channel state information reporting mode and an aperiodic channel state information reporting mode;
  • the at least one association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed may be indicated by a mapping of a specific value of a request field used for instructing the connection state reporting mode and a radio resource control signaling indicating a specific characteristic of an interference source or at least one subset of a radio resource control signaling;
  • the interference characteristic to be assumed may be indicated by parameters related to at least one of a receiver type of a communication in the communication network, a transmission mode used in a communication in the communication network, a transmission scheme used in a communication in the communication network, a resource allocation in a communication in the communication network, a parameter subset including at least one of a codebook subset based on an antenna type, a subset of virtual cell identifications, a subset of physical cell identifications, a subset of power offset values, a subset of reference signals, a subset of interference measurement resources, a subset of precoding matrix indicators, a subset of modulations orders, a subset of time division duplex downlink/uplink configurations, a target number of interferers to be canceled and a subset of a radio resource control signaling;
  • the processing may be implemented in a communication element being one of a communication terminal, a communication device, and a user equipment, wherein the communication element is communicating in a communication cell of the communication network, the communication cell being controlled by a communication network control element of the communication network.
  • a computer program product for a computer including software code portions for performing the steps of the above defined methods, when said product is run on the computer.
  • the computer program product may include a computer- readable medium on which said software code portions are stored.
  • the computer program product may be directly loadable into the internal memory of the computer and/or transmittable via a network by means of at least one of upload, download and push procedures.
  • Fig. 1 shows a diagram illustrating a general configuration of a communication network where some examples of embodiments are implementable
  • Fig. 2 shows a signaling diagram illustrating an example of embodiments
  • Fig. 3 shows a time chart illustrating an example of embodiments
  • Fig. 4 shows a flow chart of a processing conducted in a communication network control element according to some examples of embodiments
  • Fig. 5 shows a flow chart of a processing conducted in a communication element according to some examples of embodiments
  • Fig. 6 shows a diagram of a communication network control element according to some examples of embodiments.
  • Fig. 7 shows a diagram of a communication element according to some examples of embodiments.
  • cellular 2nd generation (2G) communication networks like the Global System for Mobile communications (GSM), the General Packet Radio System (GPRS), the Enhanced Data Rates for Global Evolution (EDGE), or other wireless communication system, such as the Wireless Local Area Network (WLAN), Bluetooth or Worldwide Interoperability for Microwave Access (WiMAX), took place all over the world.
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio System
  • EDGE Enhanced Data Rates for Global Evolution
  • WLAN Wireless Local Area Network
  • WiMAX Worldwide Interoperability for Microwave Access
  • 3GPP 3rd Generation Partnership Project
  • Telecoms & Internet converged Services & Protocols for Advanced Networks TISPAN
  • ITU International Telecommunication Union
  • 3GPP2 3rd Generation Partnership Project 2
  • IETF Internet Engineering Task Force
  • IEEE Institute of Electrical and Electronics Engineers
  • terminal devices such as a user device or user equipment (UE) and another communication network element or user device, a database, a server, host etc.
  • network elements such as communication network control elements, for example access network elements like access points, base stations, eNBs etc. and core network elements or functions, for example control nodes, support nodes, service nodes, gateways etc. are involved, which may belong to different communication network systems.
  • a cellular wireless communication network such as an LTE or LTE- Advanced based system
  • LTE Long Term Evolution
  • LTE-Advad based system LTE-Advad Generation
  • the present invention is not limited to an application using such types of communication systems, but is also applicable in other types of communication systems, be it wireless systems, wired systems or systems using a combination thereof.
  • a basic system architecture of a communication system may include an architecture of one or more communication networks including a wired or wireless access network subsystem and a core network.
  • Such an architecture may include one or more communication network control elements, access network elements, radio access network elements, access service network gateways or base transceiver stations, such as a base station (BS), an access point or an eNB, which control a respective coverage area or cell and with which one or more communication elements or terminal devices such as a UE or another device having a similar function, such as a modem chipset, a chip, a module etc., which can also be part of an element, function or application capable of conducting a communication, such as a UE, an element or function usable in a machine to machine communication architecture, or attached as a separate element to such an element, function or application capable of conducting a communication, or the like, are capable to communicate via one or more channels for transmitting several types of data.
  • core network elements such as gateway network elements, policy and charging control network elements, mobility management
  • the communication network is also able to communicate with other networks, such as a public switched telephone network or the Internet.
  • the communication network may also be able to support the usage of cloud services.
  • network elements of the access system such as BSs and/or eNBs, of a core network etc., and/or respective functionalities may be implemented by using any node, host, server or access node etc. entity suitable for such a usage.
  • the described network elements such as terminal devices, communication network control elements of a cell, like a BS or an eNB, access network elements and the like, core network elements etc. as well as corresponding functions as described herein, and other elements, functions or applications capable of conducting a communication may be implemented by software, e.g. by a computer program product for a computer, and/or by hardware.
  • nodes or network elements may include several means, modules, units, components, etc. (not shown) which are required for control, processing and/or communication/signaling functionality.
  • Such means, modules, units and components may include, for example, one or more processors or processor units including one or more processing portions for executing instructions and/or programs and/or for processing data, storage or memory units or means for storing instructions, programs and/or data, for serving as a work area of the processor or processing portion and the like (e.g. ROM, RAM, EEPROM, and the like), input or interface means for inputting data and instructions by software (e.g. floppy disc, CD-ROM, EEPROM, and the like), a user interface for providing monitor and manipulation possibilities to a user (e.g. a screen, a keyboard and the like), other interface or means for establishing links and/or connections under the control of the processor unit or portion (e.g.
  • radio interface means including e.g. an antenna unit or the like, means for forming a radio communication part etc.) and the like, wherein respective means forming an interface, such as a radio communication part, can be also located on a remote site (e.g. a radio head or a radio station etc.).
  • a remote site e.g. a radio head or a radio station etc.
  • a so-called “liquid” or flexible network concept may be employed where the operations and functionalities of a communication network element, network function, or of another entity of the communication network, such as of one or more of radio access network elements like a BS or eNB, may be performed in different entities or functions, such as in a node, host or server, in a flexible manner.
  • a "division of labour" between involved network elements, functions or entities may vary case by case.
  • FIG. 1 a diagram illustrating a general configuration of a communication network is shown where examples of embodiments of the invention are applicable. It is to be noted that the structure indicated in Fig. 1 shows only those devices, network elements and links which are useful for understanding principles underlying the examples of embodiments of the invention. As also known by those skilled in the art there may be several other network elements or devices involved in a connection between a communication element (for example a UE) and the network which are omitted here for the sake of simplicity.
  • reference sign 10 denotes a communication element such as a UE or the like which is capable of communicating with different at least one communication network, for example via one or more carriers and channels.
  • Reference sign 20 denotes a communication network control element such as a base station or eNB controlling a communication area or cell (indicated by a dashed line) 200. It is to be noted that there may be several cells in the communication network which are controlled, for example, by the eNB 20 or by another communication network control element. For example, a communication area or cell 250 is shown which is controlled by another communication network control element such as a base station or eNB 25.
  • UE 15 and UE 16 may be located in a respective communication area or cell and conduct a communication, for example with the corresponding eNB (e.g. eNB 20 or 25).
  • eNB e.g. eNB 20 or 25
  • control information or data can be exchanged between the communication network control elements and the communication elements (for example indicated by a dashed arrow between eNB 20 and UE 10). Furthermore, data can also be exchanged between the respective communication network control elements, e.g. between eNB 20 and eNB 25 by means of a corresponding interface, such as for example a backhaul connection using a so-called X2 link (indicated in Fig. 1 by a solid line).
  • the communications conducted between a communication element such as UE 10, 15 or 16 and the communication network may be based on similar communication techniques, such as a
  • 3GPP based LTE or LTE-A communication system or different techniques, which include, for example, a communication system using a WLAN/WiFi system or the like.
  • interferences may be caused between these communications which may deteriorate the communication quality.
  • interference is created by the data traffic of the UEs as well as common signals and channels transmitted in a cell.
  • a plurality of interference forms can be observed: for example, a so-called inter-stream interference may happen due to e.g. a non-orthogonality of spatial MIMO streams dedicated to the same UE (the so called SU-MIMO interference).
  • Another form is a so-called inter-user interference which can arise between users served in the same cell (e.g. UEs 10 and 15 in cell 200), for example when sharing the same resources (the so called MU- MIMO interference).
  • interference may happen among UEs located in different cells (e.g. UE 10 in cell 200 and UE 16 in cell 250 in Fig. 1), which is also called also inter-cell interference.
  • UEs located at the cell edge are suffering in particular by the inter-cell interference.
  • a plurality of techniques and approaches are proposed and implemented in order to cancel or suppress interferences in communications as far as possible.
  • Cancellation or suppression of, for example, inter-cell interferences may lead to a significant improvement of both cell capacity and coverage.
  • schemes for cancellation and suppression of interferences based on information provided by the communication network are studied, for example in connection with LTE-Advanced communication system, wherein advanced receivers may be operated which implement a
  • sending assistance information characterizing for example the interference caused by an interference source also referred to as an aggressor
  • an interference structure to a victim of this aggressor
  • the aggressor is located in a neighboring cell controlled by another eNB (e.g. eNB 25), while the victim is located in a cell potentially controlled by another eNB (e.g. eNB 20), making the delivery of suitable information complex.
  • eNB 25 another eNB
  • eNB e.g. eNB 20
  • a backhaul connection i.e. the eNBs serving the aggressor and victim UEs are connected e.g. through an X2 interface.
  • interference cancellation/suppression using information provided by the network allow to enhance the interference cancellation/interference suppression capability of the UEs by providing more support from the network side.
  • NAICS operation may be based on higher layer signaling network assistance and UE blind detection.
  • the higher layer signaling is applied in particular to interference parameters that are static/semi-static by nature, such as system bandwidth, CP length, number of CRS ports, MBSFN subframe configuration, set of VCIs, etc.
  • a UE in NAICS operation may be configured to blindly detect most, if not all the dynamic parameters, such as PMI, RI, modulation, TM/TS, etc..
  • higher layer NAICS signaling enables interference cancellation at the UE side.
  • the communication network i.e. the communication network control element such as the eNB
  • the communication network control element requires information about a connection state of the communication conducted with the UE.
  • corresponding information is provided by means of a CSI feedback from the UE.
  • a connection state feedback e.g. a CSI feedback
  • a CSI feedback is also of importance in interference cancellation/suppression, for example based on a
  • a connection state reporting mechanism such as a CSI reporting mechanism, takes into account the possible presence of assistance information related to an interference characteristic. That is, since the communication network may have information about a present interference situation at the time a UE calculates connection state information, such as a CSI, this information is made available to the UE. By means of this, it is possible, for example, to avoid a situation where a reported CQI is either pessimistic (calculated assuming no interference cancellation or suppression is made), or overly optimistic (assuming interference can be cancelled when that is not the case).
  • measures are provided which ensure that the connection state (e.g. the CSI) reported in an interference cancellation/suppression operation (e.g. based on NAICS specification) reflects correctly the interference situation, taking into account the receiver's (i.e. UE's) capabilities of handling interference.
  • the connection state e.g. the CSI
  • an interference cancellation/suppression operation e.g. based on NAICS specification
  • a so-called CSI reporting mechanism is used, which is employed, for example, in LTE or LTE-A based systems.
  • a connection or channel state is reported from a communication element, such as a UE or the like, to a communication network control element, such as a BS, an eNB or the like.
  • CSI refers to channel properties of a connection or communication link. It describes how a signal propagates from a transmitter to a receiver, wherein effects of, for example, scattering, fading, and power decay with distance are reflected.
  • the CSI makes it possible to adapt transmissions to current channel conditions and hence to achieve a reliable communication with high data rates e.g. in multi-antenna systems.
  • CSI is computed at the receiver and usually quantized and fed back to the transmitter.
  • CSI includes, for example, information related to a channel quality indicator (CQI), which indicates e.g. a suitable downlink transmission data rate, a precoding matrix indicator (PMI), a precoding type indicator, and/or rank indication (RI), which is used e.g.
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • RI rank indication
  • time and frequency resources that can be used by the UE to report the CSI are controlled by the eNB. It is possible to configure different forms or types for reporting a connection state. In case of CSI reporting, for example, periodic and/or aperiodic feedback mode can be implemented.
  • periodic CSI reporting mode the CSI feedback is transmitted from the UE to the eNB with a certain interval which is specified, for example, by a higher layer message (e.g. RRC connection reconfiguration message, RRC connection setup message).
  • a connection state reporting mode including e.g. periodic CSI reporting is limited by an available UL payload of a transport channel to be used. For example, in case of using PUCCH format 2, the maximum is just 11 bits / report. Therefore, periodic CSI reports typically carry only coarse wideband information.
  • a CSI feedback is triggered by sending a corresponding instruction, for example, from the eNB to the UE.
  • the format of such a CSI feedback trigger or instruction may comprise one bit, two bits or even more bits.
  • an UL grant message transmitted over PDCCH can be implemented.
  • the payload of aperiodic reports transmitted over PUSCH may be greater than that of a periodic report.
  • up to 100 bits or more can be used as payload, wherein the respective aperiodic reports or feedbacks may contain detailed information about CQI/PMI also in frequency domain.
  • a configuration for a connection state reporting such as a CSI reporting configuration, is utilized to convey information on an assumed or measured interference structure or interference characteristic.
  • each aperiodic triggering state for a CSI feedback (signaled with two or more bits, for example, in a predetermined field in a PDCCH UL grant) is associated with an assumption of a certain interference characteristic or structure related to an interference source (the aggressor).
  • the aggressor certain information related to an interference characteristic or structure are associated with (or mapped on) a certain instruction parameter or format for the CSI reporting.
  • the UE computes a CSI feedback on the assumption that this assumed interference characteristic or structure is valid.
  • any availability of interferer parametrization like PA, PMI subset, TM, etc, is reducing the blind detection error probability at the UE and improves the identification of the dominant interferer effective wireless channel and modulation information.
  • a connection state reporting mode like a periodic CSI reporting mode
  • different reporting processes are configured to assume a specific interference characteristic or structure.
  • a value of an interval/a periodicity, PUCCH resource, and/or subframe offset set by the higher layer signaling is used for associating a specific interference characteristic or structure with the current CSI reporting mode.
  • CSI feedback reports corresponding to different interference characteristics or structure may alternate in time.
  • Each CSI process may be configured separately, i.e. having a distinct reporting periodicity, a subframe offset, PUCCH resource configuration, etc.
  • the UE provides a connection state report, such as a CSI feedback, for a given process as configured, it also assumes the configured interference characteristics. That is, it is possible to configure the CSI reporting for different processes having different interference characteristics so that the periodic reports alternate, i.e. each report corresponds to a different interference hypothesis.
  • the UE is configured to use the association between the received instruction (e.g. the CSI feedback trigger having a certain value) and an interference characteristic to be assumed in a communication processing.
  • the communication processing is, for example, the calculation and transmission of the requested connection state feedback, wherein the interference structure indicated in association with the instruction for the periodic/aperiodic CSI reporting is used for the calculation.
  • the UE is configured to utilize the interference structure indicated by the periodic/aperiodic CSI reporting instruction also as an assumption for the interference structure for a demodulation processing or stage.
  • Fig. 2 shows a signaling diagram illustrating a procedure used for improving the interference cancellation and suppression according to some examples of embodiments.
  • Fig. 2 is related to a signaling and processing conducted between a communication network control element, such as, for example, the eNB 20 shown in Fig. 1, and a communication element, such as, for example, the UE 10 shown in Fig. 1, which is communicating with the communication network.
  • a communication network control element such as, for example, the eNB 20 shown in Fig. 1
  • a communication element such as, for example, the UE 10 shown in Fig. 1, which is communicating with the communication network.
  • NAICS network assisted interference cancellation and suppression operation
  • the UE 10 obtains, for example from the eNB 20, configuration information related to the connection state reporting, such as CSI reporting configuration information.
  • the CSI reporting configuration information includes RRC signaling information indicating the association between the instruction for the connection state reporting (e.g. the value of a CSI request field) and the interference structure through the serving cell (e.g. cell 200).
  • the UE 10 receives also an additional indication related to an interference hypothesis consisting of one or more interference parameters.
  • These interference parameters may be a subset of the NAICS RRC signaling.
  • the serving cell/eNB 20 sends to the UE 10 the NAICS RRC signaling indicating interferer characteristics and how they are associated with an instruction for a connection state reporting mode, such as aperiodic CSI triggering states.
  • the RRC signaling may consist of predefined hypothesis/subsets consisting of interference parameters (subsets of parameters).
  • the serving cell/eNB 20 sends to the UE 10 an instruction for connection state reporting, such as a CSI reporting (feedback) trigger.
  • a CSI reporting (feedback) trigger is sent to the UE 10 in connection with a PDCCH UL Grant message.
  • the instruction is sent to the UE 10 considering an interference characteristic for a current communication between the UE 10 and the eNB 20, that is, the connection state reporting instruction, e.g. the CSI feedback trigger sent to the UE 10 is selected or generated under consideration of the association between the instructions and the interference characteristics to be assumed as indicated in the configuration information provided in S10.
  • an aperiodic CSI feedback trigger is sent to the UE 10 having a predetermined value, e.g.
  • the requesting eNB 20 e.g. by means of own measurements or calculations, on the basis of information provided for example from another source (e.g. the eNB 25), or the like.
  • the instruction to be sent to the UE 10 is then selected, for example, on the basis of a comparison between the determined interference structure and the respective interference structures associated with instruction values (which are provided to the UE 10 by means of the configuration information in S10, for example).
  • the determined interference structure is compared with interference structures corresponding to those indicated in connection with the configuration information, wherein the instruction to be used is selected which is associated with the interference characteristic whose parameters are decided to be the best match for the presently determined interference characteristic.
  • weighting factors can be considered, i.e. certain parameters may be assumed to be more important than others.
  • the UE 10 may be configured to assume in a demodulation stage that the same interference characteristic or structure is valid not only for a CSI calculation, but can also be utilized for demodulation. Consequently, a demodulation based on the interference characteristic to be assumed can also be performed. According to examples of embodiments, this assumption is assumed to be valid only for a predetermined time, e.g. a predetermined number N of following subframes after the receipt of the instruction such as aperiodic feedback CSI trigger in the PDCCH UL grant.
  • a predetermined time e.g. a predetermined number N of following subframes after the receipt of the instruction such as aperiodic feedback CSI trigger in the PDCCH UL grant.
  • the number N may be set, for example, by means of higher signaling, or may be a fixed value stored in the UE and set in the specification, or the like.
  • the UE 10 reports the CSI feedback to the eNB 20.
  • the serving cell/eNB 20 receives the requested CSI feedback according to the indicated assumptions.
  • a link adaptation is conducted on the basis of the received CSI report.
  • the serving cell/eNB 20 schedules resources, such as a PDSCH to the UE 10.
  • information or parameters related to the interference structure / characteristics may include data being related to one or more of the following : a receiver type involved in the communication being interfered, a transmission mode of the communication, a transmission scheme of the communication, a resource allocation for the communication, various types of parameter subsets, for example codebook subsets based on an antenna type (cross polarized or ULA), subsets of VICs/PICs, subsets of power offset values PA, specific values for PMI, RI, modulation order, number of interferers to be canceled, etc.
  • this list is not limiting the possible information or parameters being usable in examples of embodiments, wherein, one, two, more than two of these data can be considered.
  • connection state reporting mode For a specific connection state reporting mode and one or more of these interference characteristics, in the following, specific examples will be described. It is to be noted that the following examples are only for illustrative purpose. There is a plurality of other association forms or options which are applicable correspondingly. Furthermore, an example is described where the instruction regarding the connection state reporting mode is provided by two bits, wherein, as indicated above, also one bit or more bits can be used.
  • association is provided by different CSI reporting options and RRC signaling.
  • the association between a corresponding value of a CSI request field and an interference characteristic to be assumed can be as follows. For a CSI request field value of "00", it is defined that no (aperiodic) CSI reporting is triggered.
  • a CSI request field value of "01” it is defined that an (aperiodic) CSI reporting is triggered for a serving cell wherein it is assumed that no information about the interference characteristic or structure is available.
  • a CSI request field value of "10” it is defined that an (aperiodic) CSI reporting is triggered for a serving cell wherein it is assumed that an interference source uses a first transmission mode (e.g. a transmission mode 3).
  • a CSI request field value of "11” it is defined that an (aperiodic) CSI reporting is triggered for a serving cell wherein it is assumed that an interference source uses a second transmission mode (e.g. a transmission mode 9).
  • RRC subsets include different interference hypothesis.
  • an RRC subsetl including parameters according to: ⁇ PCI1, VCI1, CSI-RS1, IMR1, PA1, TMx, PMI subsetl ⁇ and an RRC subset2 including parameters according to: ⁇ PCI2, VCI2, CSI-RS2, IMR2, PA2, TMx, PMI subset2 ⁇ are defined.
  • an example is related to an aperiodic CSI reporting mode and the interference characteristic is related to a RRC signaling or subset of RRC signaling
  • the association between a corresponding value of a CSI request field and an interference characteristic to be assumed can be as follows.
  • CSI request field value For a CSI request field value of "00”, it is defined that no (aperiodic) CSI reporting is triggered.
  • a CSI request field value of "01” it is defined that an (aperiodic) CSI reporting is triggered for a serving cell wherein it is assumed that no information about the interference characteristic or structure is available.
  • a CSI request field value of "10” it is defined that an (aperiodic) CSI reporting is triggered for a serving cell wherein it is assumed that an interference source uses RRC subsetl.
  • a CSI request field value of "11” it is defined that an (aperiodic) CSI reporting is triggered for a serving cell wherein it is assumed that an interference source uses RRC subset2.
  • the RRC subsets may also include parameters or parameter subsets as an RRC subset3 : ⁇ PCI subsetl, VCI subsetl, ZP and/or NZP CSI-RS subset 1, IMR subset 1, PA subset 1, TM subset, PMI subsetl, modulation order subset 1, numbers_of_interferers to be canceled, resource allocation type, TDD UL/DL configuration ⁇
  • the CSI request field may be also associated with a receiver type assumption like receivers performing interference suppressions, like enhanced IRC, or receivers performing interference cancellation, like SLIC/R-ML.
  • the CSI request field may be further associated with different types of interference cancelation, for example PDSCH IC, CRS IC, PDCCH IC, ePDCCH IC, etc.
  • a time flow of the interference procedure according to examples of embodiments for improving the interference cancellation and suppression is illustrated by means of a sequence of subframes of a communication.
  • the UL grant message including the instruction for the connection state reporting mode such as an aperiodic CSI feedback trigger, (see S10 in Fig. 2) is assumed to be received by the UE 10.
  • the instruction provides also an indication of an interference structure/characteristic to be assumed to be present (by means of the association described above, for example). This assumed interference structure/characteristic is used in connection with the communication processing of the UE 10.
  • the UE 10 utilizes the interference assumption provided by the association of the instruction also in the data demodulation processing for a predetermined number N of subframes following to the reception of the PDCCH UL grant carrying the CSI feedback trigger (subframe #2).
  • N can be e.g. a fixed value or a configurable value being set via a higher layer signaling or the like, such as RRC signaling.
  • the predetermined number N of subframes can also be started to be counted after a transmission of the corresponding CSI feedback, i.e. after subframe #6, for example (see dashed arrow in Fig. 3).
  • each CSI triggering state is associated with predefined information about an interference characteristic, wherein this is provided to the UEs of a cell. The UE is then able to use this association so as to determine the CSI and to transmit it back to the network. In this manner, the UE is able to provide a more accurate CSI feedback.
  • the CSI triggering signaling in NAICS is resolved by associating the CSI request field with RRC configuration parameters and receiver types.
  • the communication network control element such as the eNB 20
  • the communication network control element is provided with flexibility regarding to dynamically switch ON/OFF NAICS feature by means of selecting a corresponding instruction for a connection state reporting mode, such as a aperiodic CSI feedback trigger, while in addition it is possible to indicate the current interference structure.
  • a connection state reporting mode such as a aperiodic CSI feedback trigger
  • examples of embodiments are efficient with regard to signaling load, since, for example, RRC signaling is needed only upon configuring the CSI reporting.
  • extra signaling for this purpose can be avoided.
  • Fig. 4 shows a flow chart of a processing conducted in a communication network control element according to some examples of embodiments.
  • the processing is executed by a communication network control element of communication network controlling at least one communication cell in which a communication element is able to communicate with the communication network, wherein the communication element is one of a communication terminal, a communication device, and a user equipment.
  • configuration information related to a reporting procedure of a connection state of a communication (e.g. CSI reporting) between a communication element (e.g. UE 10) and a communication network (e.g. represented by eNB 20) is provided.
  • the configuration information indicates at least one association between an instruction for a connection state reporting mode to be used by the communication element and an interference characteristic to be assumed.
  • a transmission of an instruction for a connection state reporting mode (e.g. a CSI feedback trigger) is caused.
  • the instruction to be transmitted is selected in accordance with an interference characteristic in a current communication situation.
  • the interference characteristic in the current communication situation is determined. The determination is based, for example, on an own measurement of parameters related to the interference characteristic (i.e. done e.g. by the eNB 20) and/or an external signaling conveying parameters related to the interference characteristic (e.g. transmitted from the eNB 25).
  • an instruction for a connection state reporting mode is selected on the basis of the determined interference characteristic as the instruction for a connection state reporting mode which is caused to be transmitted. For example, the selecting is based on a comparison of the determined interference characteristic and the interference characteristic to be assumed (i.e. the respective interference characteristics included in the configuration information and associated to the instruction for the connection state reporting mode).
  • connection state feedback is received in response to the instruction caused to be transmitted.
  • the connection state feedback is processed accordingly, wherein a result thereof is used for performing a link adaptation of the communication between the communication element (UE 10) and the network.
  • the configuration information is provided by using a higher layer signaling (e.g. RRC signaling) between the communication element and the communication network.
  • a higher layer signaling e.g. RRC signaling
  • the instruction for the connection state reporting mode (e.g. the CSI feedback trigger) is related to one of a periodic channel state information reporting mode (e.g. periodic CSI reporting) and an aperiodic channel state information reporting mode (e.g. aperiodic CSI reporting).
  • a periodic channel state information reporting mode e.g. periodic CSI reporting
  • an aperiodic channel state information reporting mode e.g. aperiodic CSI reporting.
  • the association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed is indicated by a mapping of a specific value of a request field used for instructing the connection state reporting mode and a radio resource control signaling indicating a specific characteristic of an interference source or at least one subset of a radio resource control signaling.
  • the interference characteristic to be assumed is indicated by parameters related to at least one of a receiver type of a communication in the communication network, a transmission mode TM used in a communication in the communication network, a transmission scheme used in a communication in the communication network, a resource allocation in a communication in the communication network, a parameter subset including at least one of a codebook subset based on an antenna type, a subset of VCIs, a subset of PCIs, a subset of power offset values (PA), a subset of reference signals, a subset of IMRs, a subset of PMIs, a subset of modulations, a subset of TDD DL/UL configuration, a target number of interferers to be canceled, and a subset of an RRC signaling.
  • a parameter subset including at least one of a codebook subset based on an antenna type, a subset of VCIs, a subset of PCIs, a subset of power offset values (PA), a subset
  • Fig. 5 shows a flow chart of a processing conducted in a communication element according to some examples of embodiments.
  • the processing is executed by a communication element being one of a communication terminal, a communication device, and a user equipment, wherein the communication element is communicating in a communication cell of the communication network, the communication cell being controlled by a communication network control element of the communication network.
  • configuration information related to a reporting procedure of a connection state of a communication (e.g. a CSI reporting) between a communication element (e.g. UE 10) and a communication network (represented e.g. by the eNB 20) is obtained.
  • the configuration information indicates at least one association between an instruction for a connection state reporting mode (e.g. CSI feedback trigger) to be used by a communication element and an interference characteristic to be assumed.
  • a connection state reporting mode e.g. CSI feedback trigger
  • an instruction for a connection state reporting mode (e.g. a CSI feedback trigger) is received and processed.
  • the communication processing in S230 comprises at least one of a connection state reporting processing and a demodulation processing.
  • connection state reporting processing e.g. CSI reporting processing
  • a connection state feedback e.g. CSI feedback
  • the acquired information related to the interference characteristic to be assumed is used as a basis for the connection state feedback calculation, wherein the calculated connection state feedback is transmitted to the communication network (e.g. to the eNB 20).
  • a demodulation is executed in a predetermined number (N) of subframes following after receiving the instruction for a connection state reporting mode (e.g. the CSI feedback trigger).
  • a connection state reporting mode e.g. the CSI feedback trigger.
  • the configuration information is provided by using a higher layer signaling (e.g. RRC signaling) between the communication element and the communication network.
  • the instruction for the connection state reporting mode (e.g. the CSI feedback trigger) is related to one of a periodic channel state information reporting mode (e.g. periodic CSI reporting) and an aperiodic channel state information reporting mode (e.g. aperiodic CSI reporting).
  • the association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed is indicated by a mapping of a specific value of a request field used for instructing the connection state reporting mode and a radio resource control signaling indicating a specific characteristic of an interference source or at least one subset of a radio resource control signaling.
  • the interference characteristic to be assumed is indicated by parameters related to at least one of a receiver type of a communication in the communication network, a transmission mode TM used in a communication in the communication network, a transmission scheme used in a communication in the communication network, a resource allocation in a communication in the communication network, a parameter subset including at least one of a codebook subset based on an antenna type, a subset of VCIs, a subset of PCIs, a subset of power offset values (PA), a subset of reference signals, a subset of IMRs, a subset of PMIs, a subset of modulations, a subset of TDD DL/UL configuration, a target number of interferers to be canceled and a subset of an RRC signaling.
  • a parameter subset including at least one of a codebook subset based on an antenna type, a subset of VCIs, a subset of PCIs, a subset of power offset values (PA), a subset of
  • Fig. 6 shows a diagram of a communication network control element according to some examples of embodiments, which is configured to implement the interference cancellation and suppression procedure as described in connection with some of the examples of embodiments.
  • the communication network control element like eNB 20, which is shown in Fig. 6, may include further elements or functions besides those described herein below.
  • the element may be also another device or function having a similar task, such as a chipset, a chip, a module, an application etc., which can also be part of a communication network control element or attached as a separate element to a communication network control element, or the like.
  • the communication network control element shown in Fig. 6 may include a processing circuitry, a processing function, a control unit or a processor 21, such as a CPU or the like, which is suitable for executing instructions given by programs or the like related to the interference cancellation and suppression procedure.
  • the processor 21 may include one or more processing portions or functions dedicated to specific processing as described below, or the processing may be run in a single processor or processing function.
  • Portions for executing such specific processing may be also provided as discrete elements or within one or more further processors, processing functions or processing portions, such as in one physical processor like a CPU or in one or more physical or virtual entities, for example.
  • Reference signs 22 and 23 denote transceiver or input/output (I/O) units or functions (interfaces) connected to the processor or processing function 21.
  • the I/O units 22 may be used for communicating with one or more communication elements, such as UE 10, and the like.
  • the I/O units 23 may be used for communicating with one or more network elements, such as other communication network control elements (such as eNB 25 via X2 link), but also with core network elements, and the like.
  • the I/O units 22 and 23 may be a combined unit including communication equipment towards several network elements, or may include a distributed structure with a plurality of different interfaces for different network elements.
  • Reference sign 24 denotes a memory usable, for example, for storing data and programs to be executed by the processor or processing function 21 and/or as a working storage of the processor or processing function 21.
  • the processor or processing function 21 is configured to execute processing related to the above described interference cancellation and suppression procedure.
  • the processor or processing circuitry or function 21 includes a sub-portion 211 as a processing portion which is usable for providing configuration information.
  • the portion 211 may be configured to perform processing according to SlOO of Fig. 4.
  • the processor or processing circuitry or function 21 includes a sub-portion 212 usable as a portion for determining an interference characteristic. Furthermore, the processor or processing circuitry or function 21 includes a sub-portion 213 usable as a portion for generating and transmitting an instruction related to a connection state reporting mode (e.g. a CSI feedback trigger). The portion 213 may be configured to perform a processing according to SI 10 of Fig. 4.
  • Fig. 7 shows a diagram of a communication element according to some examples of embodiments, which is configured to implement the interference cancellation and suppression procedure as described in connection with some of the examples of embodiments.
  • the communication element like UE 10, which is shown in Fig. 7, may include further elements or functions besides those described herein below.
  • the element may be also another device or function having a similar task, such as a chipset, a chip, a module, an application etc., which can also be part of a communication element or attached as a separate element to a communication element, or the like.
  • each block and any combination thereof may be implemented by various means or their combinations, such as hardware, software, firmware, one or more processors and/or circuitry.
  • the communication element shown in Fig. 7 may include a processing circuitry, a processing function, a control unit or a processor 11, such as a CPU or the like, which is suitable for executing instructions given by programs or the like related to the interference cancellation and suppression procedure.
  • the processor 11 may include one or more processing portions or functions dedicated to specific processing as described below, or the processing may be run in a single processor or processing function. Portions for executing such specific processing may be also provided as discrete elements or within one or more further processors, processing functions or processing portions, such as in one physical processor like a CPU or in one or more physical or virtual entities, for example.
  • Reference sign 12 denotes transceiver or input/output (I/O) units or functions (interfaces) connected to the processor or processing function 11.
  • the I/O units 12 may be used for communicating with one or more communication networks, i.e. communication network control elements, such as eNB 20, and the like.
  • the I/O units 12 may be a combined unit including communication equipment towards several network elements, or may include a distributed structure with a plurality of different interfaces for different network elements.
  • Reference sign 14 denotes a memory usable, for example, for storing data and programs to be executed by the processor or processing function 11 and/or as a working storage of the processor or processing function 11.
  • the processor or processing function 11 is configured to execute processing related to the above described interference cancellation and suppression procedure.
  • the processor or processing circuitry or function 11 includes a sub-portion 110 as a processing portion which is usable for obtaining configuration information.
  • the portion 110 may be configured to perform processing according to S200 of Fig. 5.
  • the processor or processing circuitry or function 11 includes a sub-portion 111 usable as a portion for receiving and processing an instruction related to a connection state reporting mode (e.g. a CSI feedback trigger).
  • the portion 111 may be configured to perform processing according to S210 of Fig. 5.
  • the processor or processing circuitry or function 11 includes a sub-portion 113 usable as a portion for acquiring an interference characteristic.
  • the portion 113 may be configured to perform a processing according to S220 of Fig. 5.
  • the processor or processing circuitry or function 11 includes a sub-portion 114 usable as a portion for conducting a communication processing.
  • the portion 114 may be configured to perform a processing according to S230 of Fig. 5.
  • an apparatus including means for providing configuration information related to a reporting procedure of a connection state of a communication between a communication element and a communication network, wherein the configuration information indicates at least one association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed; and means for causing transmission of an instruction for a connection state reporting mode according to an interference characteristic in a current communication situation.
  • an apparatus including means for obtaining configuration information related to a reporting procedure of a connection state of a communication between a communication element and a communication network, wherein the configuration information indicates at least one association between an instruction for a connection state reporting mode to be used by a communication element and an interference characteristic to be assumed; means for receiving an instruction for a connection state reporting mode; means for acquiring information related to interference characteristic to be assumed in a current communication situation by using the association; and means for conducting a communication processing by using the acquired information.
  • an access technology via which signaling is transferred to and from a network element may be any suitable present or future technology, such as
  • WLAN Wireless Local Access Network
  • WiMAX Worldwide Interoperability for Microwave Access
  • LTE Long Term Evolution
  • LTE-A Bluetooth
  • Infrared and the like
  • embodiments may also apply wired technologies, e.g. IP based access technologies like cable networks or fixed lines.
  • a user device also called UE, user equipment, user terminal, terminal device, etc.
  • UE User Equipment
  • user terminal device etc.
  • FIG. 1 An example of such a relay node is a layer
  • the user device typically refers to a portable computing device that includes wireless mobile communication devices operating with or without a subscriber identification module (SIM), including, but not limited to, the following types of devices: a mobile station (mobile phone), smartphone, personal digital assistant (PDA), handset, device using a wireless modem (alarm or measurement device, etc.), laptop and/or touch screen computer, tablet, game console, notebook, and multimedia device.
  • SIM subscriber identification module
  • a user device may also be a nearly exclusive uplink only device, of which an example is a camera or video camera loading images or video clips to a network, or a nearly exclusive downlink only device, such as a portable video player.
  • a device may be regarded as an apparatus or as an assembly of more than one apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing.
  • - embodiments suitable to be implemented as software code or portions of it and being run using a processor or processing function are software code independent and can be specified using any known or future developed programming language, such as a high-level programming language, such as objective-C, C, C++, C#, Java, etc., or a low-level programming language, such as a machine language, or an assembler.
  • a high-level programming language such as objective-C, C, C++, C#, Java, etc.
  • a low-level programming language such as a machine language, or an assembler.
  • - implementation of embodiments is hardware independent and may be implemented using any known or future developed hardware technology or any hybrids of these, such as a microprocessor or CPU (Central Processing Unit), MOS (Metal Oxide Semiconductor), CMOS (Complementary MOS), BiMOS (Bipolar MOS), BiCMOS (Bipolar CMOS), ECL (Emitter Coupled Logic), and/or TTL (Transistor-Transistor Logic).
  • CPU Central Processing Unit
  • MOS Metal Oxide Semiconductor
  • CMOS Complementary MOS
  • BiMOS BiMOS
  • BiCMOS BiCMOS
  • ECL Emitter Coupled Logic
  • TTL Transistor-Transistor Logic
  • - embodiments may be implemented as individual devices, apparatuses, units, means or functions, or in a distributed fashion, for example, one or more processors or processing functions may be used or shared in the processing, or one or more processing sections or processing portions may be used and shared in the processing, wherein one physical processor or more than one physical processor may be used for implementing one or more processing portions dedicated to specific processing as described,
  • an apparatus may be implemented by a semiconductor chip, a chipset, or a (hardware) module including such chip or chipset;
  • ASIC Application Specific IC
  • FPGA Field-programmable Gate Arrays
  • CPLD Complex Programmable Logic Device
  • DSP Digital Signal Processor
  • embodiments may also be implemented as computer program products, including a computer usable medium having a computer readable program code embodied therein, the computer readable program code adapted to execute a process as described in embodiments, wherein the computer usable medium may be a non-transitory medium.

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Abstract

Un procédé consiste à fournir des informations de configuration relatives à une procédure de création de rapport d'un état de connexion d'une communication entre un élément de communication et un réseau de communications, les informations de configuration indiquant au moins une association entre une instruction pour un mode de rapport d'état de connexion devant être utilisé par un élément de communication et une caractéristique de brouillage devant être supposée; et commander la transmission d'une instruction pour un mode de rapport d'état de connexion d'après une caractéristique de brouillage dans une situation de communication actuelle.
PCT/EP2014/062407 2014-06-13 2014-06-13 Annulation et suppression de brouillage assistées par réseau pour des rapports cqi dans un réseau de communications Ceased WO2015188876A1 (fr)

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WO2018058600A1 (fr) * 2016-09-30 2018-04-05 Qualcomm Incorporated Conception de rétroaction d'informations d'état de canal avancée
CN111294814A (zh) * 2018-01-12 2020-06-16 Oppo广东移动通信有限公司 传输配置方法及相关产品
CN111294814B (zh) * 2018-01-12 2023-05-05 Oppo广东移动通信有限公司 传输配置方法、网络设备、终端以及计算机存储介质

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