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EP2880796A1 - Volume configurable d'une « requête de csi » pour le déclenchement d'un retour de csi apériodique - Google Patents

Volume configurable d'une « requête de csi » pour le déclenchement d'un retour de csi apériodique

Info

Publication number
EP2880796A1
EP2880796A1 EP12882377.0A EP12882377A EP2880796A1 EP 2880796 A1 EP2880796 A1 EP 2880796A1 EP 12882377 A EP12882377 A EP 12882377A EP 2880796 A1 EP2880796 A1 EP 2880796A1
Authority
EP
European Patent Office
Prior art keywords
size
request field
channel state
state indicators
sets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12882377.0A
Other languages
German (de)
English (en)
Other versions
EP2880796A4 (fr
Inventor
Xiaoyi Wang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks Oy
Original Assignee
Nokia Solutions and Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Solutions and Networks Oy filed Critical Nokia Solutions and Networks Oy
Publication of EP2880796A1 publication Critical patent/EP2880796A1/fr
Publication of EP2880796A4 publication Critical patent/EP2880796A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • 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
    • H04L1/0028—Formatting
    • H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
    • 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
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • 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
    • H04L1/0028—Formatting
    • H04L1/0031—Multiple signaling transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI

Definitions

  • the present invention relates to an apparatus, a method, a system, and a computerprogramproduct related to channel state indicators . More particularly, the present invention relates to an apparatus, a method, a system, and a computer program product for aperiodic CSI feedback triggering.
  • CSI-RS resource A combination of CSI-RS parameters
  • CoMP allows overcoming interference as well as provides diversity gains.
  • CoMP typically requires significant overhead with respect to reference signals for channel estimation in a multi cellular environment and generates significant overhead for feedback of channel state information (CSI) information.
  • CSI channel state information
  • the signal processing complexity is quite high. This effort is typically only worth if rewarded by significant gains in terms of spectral efficiency or cell edge performance.
  • CA CarrierAggregation
  • 2-bit CSI request field will be used in DCI format 0 (if in UE SS) and DCI format 4 for triggering of aperiodic CoMP feedback
  • the candidate CSI reports are configured by RRC
  • aUE should searchtwo search spaces in PDCCH: aUE specific search space and a common search space (CSS) .
  • CSS is typically used for broadcasted information. The size is quite fixed, therefore it ie difficult to add any bits for the DCI transmitted in CSS.
  • LTE uplink DCI DCI format 0 and 4
  • CSI request field has only 1 bit to indicate whether or not this DCI will trigger CSI feedback.
  • the CSI request field become 2 bits, where some status is used to indicate for which cell (or which sub-set of cells) the CSI should be reported.
  • CA framework will be reused to trigger the aperiodical CSI feedback. That means CSI request field will be reused for CoMP.
  • a combination of CA+ CoMP makes the situation extremely complicated, because the UE might be aggregated with multiple CC and multiple CSI-RS resources simultaneously. How to efficiently reuse the request field is a big problem to be solved.
  • CSI request field has 2 bits, otherwise it has only 1 bit.
  • CSIs may be grouped into sets of CSIs.
  • eNB may use RRC signaling to configure sets of CSI processes (i.e. processes comprising measuring CSI and providing the measurement result; in this document, CSI and CSI process are used synonymously, if not otherwise clear from the context) .
  • RRC signaling i.e. processes comprising measuring CSI and providing the measurement result; in this document, CSI and CSI process are used synonymously, if not otherwise clear from the context
  • eNB has full freedom to configure any CSI processes in any set. No specified mapping rules apply. For example, using higher layer signaling, e.g. RRC signaling, eNB may configure 3 sets of CSI processes. Each set could include 1 or more CSI processes. E.g. one set could include CSI process 1, 3, 4, 5. Another set could include 3 and 4, and a 3rd set might only include CSI process 1.
  • an apparatus comprising determining means adapted to determine a size of a request field; deciding means adapted to decide, for each set of channel state indicators configured in a terminal, if the channel state indicators of the respective configured set are to be requested, wherein either all or none of the channel state indicators of the respective configured set are to be requested, and wherein the deciding means is adapted to decide for not more than a maximum number of configured sets that they are to be requested, wherein the maximum number corresponds to the determined size; providing means adapted to provide, to the terminal, the request field with the determined size indicating all configured sets for which the deciding means decided to request the respective channel state indicators.
  • the apparatus may further comprise signaling means adapted to signal, to the terminal, the size of the request field.
  • the size of the request field may depend on a number of the configured channel state indicators.
  • determining processor adapted to determine a size of a request field
  • deciding processor adapted to decide, for each set of channel state indicators configured in a terminal, if the channel state indicators of the respective configured set are to be requested, wherein either all or none of the channel state indicators of the respective configured set are to be requested, and wherein the deciding processor is adapted to decide for not more than a maximum number of configured sets that they are to be requested, wherein the maximum number corresponds to the determined size; providing processor adapted to provide, to the terminal, the request field with the determined size indicating all configured sets for which the deciding processor decided to request the respective channel state indicators .
  • the apparatus may further comprise signaling processor adapted to signal, to the terminal, the size of the request field.
  • the size of the request field may depend on a number of the configured channel state indicators.
  • a base station comprising an apparatus according to any of the first and second aspects.
  • an apparatus comprising determining means adapted to determine a size of a received request field, extracting means adapted to extract the received request field from a received signal taking into account the determined size; evaluating means adapted to evaluate the extracted request field in order to obtain requested sets, wherein the request field indicates the requested Bets of one ormore configuredsets intowhichoneormore configuredchannel state indicators are grouped; measuring means adapted to measure all channel state indicators of the requested sets.
  • the determiningmeans maybe adapted to determine the size of the request field by determining a number of the configured channel state indicators and to determine the size of the request field corresponding to the number of the configured channel state indicators.
  • the determining means may be adapted to determine the size of the request fieldbased on a received indication signal .
  • an apparatus comprising determining processor adapted to determine a size of a received request field, extractingprocessor adapted to extract the receivedrequest fieldfromareceived signal taking into account the determined size; evaluating processor adapted to evaluate the extracted request field in order to obtain requested sets, wherein the request field indicates the requested sets of one ormore configuredsets into whichone ormore configured channel state indicators are grouped; measuring processor adapted to measure all channel state indicators of the requested sets.
  • the determining processor may be adapted to determine the size of the request field by determining a number of the configured channel state indicators and to determine the size of the request field corresponding to the number of the configured channel state indicators. In the apparatus, the determining processor may be adapted to determine the size of the request field based on a received indication signal.
  • a terminal comprising an apparatus according to any of the fourth and fifth aspects.
  • a method comprisingdetermininga size of a request field; deciding, for each set of channel state indicators configured in a terminal , if the channel state indicators of the respective configured set are to be requested, wherein either all or none of the channel state indicators of the respective configured set are to be requested, and wherein it is decided for not more than a maximum number of configured sets that they are to be requested, wherein the maximum number corresponds to the determined size; providing, to the terminal, the request field with the determined size indicating all configured sets for which it is decided to request the respective channel state indicators.
  • the method may be a method of CSX feedback triggering.
  • the method may further comprise signaling, to the terminal, the size of the request field.
  • the size of the request field may depend on a number of the configured channel state indicators.
  • amethod comprisingdetermininga size of a receivedrequest field, extracting the receivedrequest field fromareceived signal taking into account the determined size; evaluating the extractedrequest field in order to obtain requested sets, wherein the request field indicates the requested sets of one or more configured sets into which one or more configured channel state indicators are grouped; measuring all channel state indicators of the requested sets.
  • the method may be a method of CSI feedback triggering.
  • the determining may comprise determining the size of the request field by determining a number of the configured channel state indicators and determining the size of the request field corresponding to the number of the configured channel state indicators .
  • the determining may comprise determining the size of the request field based on a received indication signal.
  • the computer program product maybe embodiedas a computer readable medium. According to embodiments of the invention, at least the following advantages are achieved:
  • the average CSI request length is reduced.
  • the payload on PDCCH is reduced.
  • a lower coding rate may be converted to lower aggregation level, which means less eCCE are used. Though this coding gain may be quite small (in some cases, only 1 bit is saved) , it is not negligible in general. Due to less payload on the DCI, a larger coverage may be achieved. In detail, the coverage of the control channel is depends on the maximum number of REs used for one control message and the payload of one control signaling. If the number of payload bits is reduced, the coverage may be enhanced.
  • control signaling in LTE - like signaling of UL grants DCI 0 and 4 - is transmitted on PDCCH and the system has to ensure a very safe detection of PDCCHs by all UEs in the cell area.
  • the size of the PDCCH directed to a certain UE depends on the payload size of the control information (DCI) and the effective coding rate .
  • the coding rate on PDCCH is adapted by selecting the aggregation level on PDCCH such that it is suitable to the channel conditions, where the aggregation level determines the number of CCEs or eCCEs on PDCCH. But selection of aggregation levels allows only for a very coarse adjustment of the coding rate which may lead to rather inefficient usage of available PDCCH resources.
  • Allowing for a configurable CSI request field is an additional means forcontrollingthe code rateonPDCCHbyadjusting thepayload conveyed on PDCCH.
  • Longer CSI request fields may in particular be useful in systems using CA and CoMP for triggering a variety of specific CSI reports which may be used for improving scheduling decisions and for improving the arrangement of cooperative areas .
  • longer CSI request fields lead to higher coding rates which affects the usage of resources on PDCCH negatively.
  • Cell sizes may be one aspect for determining the length of the CSI request field in a system.
  • a longer CSI request field may be advantageous inareaswithsmall cells andahighnumberof availablebase stations or access points when a variety of specific CSI reports allows to obtain comprehensive information about the channel conditions while the small cell sizes ensure a low aggregation level and an efficient usage of PDCCH resources.
  • the system may more benefit from short CSI request fields and the more robust coding rate for minimizing the aggregation levels of PDCCHs and an efficient usage of PDCCH resources .
  • FIG. 1 shows an apparatus according to an embodiment of the invention
  • Fig.2 shows a method according to an embodiment of the invention
  • Fig.3 shows anapparatus according toanembodimentof the invention
  • Fig.4 shows a method according to an embodiment of the invention.
  • the apparatus is configured to perform the corresponding method, although in some cases only the apparatus or only the method are described.
  • the number of bits for CSI request field might be larger than 2.
  • a way to indicate the size of the CSI request field to the UE is needed.
  • Method 1 Explicit way
  • a RRC signalling is created to indicate the size of CSI request field.
  • eNB can configure the size of CSI request field using UE specific RRC signalling, e.g. whether it is 1, 2 or 3 bits or even more bits in the CSI request field.
  • the maximum size of the CSI request field may be e.g. 3 bits.
  • the size may depend on e.g. the number of configured CSIs, or on the number of CSIs that could be grouped together for feedback.
  • Method 2 (implicit way) : the size of CSI request field is decided by the number of configured CSI (across all configured CC) or configured sets of CSIs.
  • a number of bits in the CSI request field may be the same as the number of configured CSIs or the number of configured sets.
  • the number of configured CSIs is the same as the number of sets into which the configured CSIs are grouped if each set comprises exactly one configured CSI and each configured CSI is comprised in exactly one set. Inother embodiments, thenumberof configuredsetsmaybe different . If the number of configured sets is higher than the number of bits in the CSI request field, only some of the sets may be triggered by the CSI request field. For example, if 7 sets are defined and the CSI request field has 2 bits, only two sets (e.g. the first two sets or the last two sets) may be triggered by the CSI request field, the other five sets not. Thus, the number of triggerable sets (sets whose CSIs may be triggered by the CSI request field) is independent from the number of configured sets. However, in these embodiments, the UE must be informed about the size of the CSI request field. This may be done by the explicit way (Method 1) , or, according to some embodiments, in the following way:
  • This method has the advantage that no additional signalling of the size of the CSI request field is required. On the other hand, the UE has to calculate the size of the CSI request field.
  • Fig.1 shows anapparatus accordingto anembodiment of the inventio .
  • the apparatus may be a base station such as a NodeB or an eNodeB .
  • Fig.2 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 1 may perform the method of Fig. 2 but is not limited to this method.
  • the method of Fig. 2 may be performed by the apparatus of Fig. 1 but is not limited to being performed by this apparatus.
  • the determiningmeans 10 determines a size of a request field (S10) .
  • the size of the request field may depend on the number of configured channel state indicators.
  • the deciding means 20 decides, for each set of channel state indicators configured in a terminal, if the channel state indicators of the respective configured set are to be requested (S20) . Therein, it considers that either all or none of the channel state indicators of the respective configured set are to be requested.
  • the deciding means 20 decides for a number of sets that they are to be requested, wherein this number does not exceed a maximum number. The maximum number corresponds to the size of the request field determined by the determining means 10.
  • the providingmeans 30 provides, to the terminal, the request field indicating all configured sets forwhich the decidingmeans decided to request the respective channel state indicators (S30) .
  • the request field has the size determined by the determining means 10.
  • Fig.3 showsanapparatus accordingto anembodiment of the invention.
  • the apparatus may be a terminal such as a user equipment.
  • Fig. 4 shows a method according to an embodiment of the invention.
  • the apparatus according to Fig. 3 may perform the method of Fig. 4 but is not limited to this method.
  • the method of Fig. 4 may be performed by the apparatus of Fig. 3 but is not limited to being performed by this apparatus.
  • the apparatus comprises determining means 110, extracting means 120, evaluating means 130, and measuring means 140.
  • the determining means 110 determines a size of a received request field (S110) .
  • the size may be determined based on a received indication or based on the number of configured CSIs.
  • the extracting means 120 extracts the received request field from a received signal taking into account the size of the request field as determined by the determining means 110 (S120) .
  • the evaluating means 130 evaluates the extracted request field in order to obtain requested sets (S130) .
  • the request field indicates the requested sets of one or more configured sets into which one or more configured channel state indicators are grouped.
  • the measuring means 140 measures all channel state indicators of the requested sets (S140) .
  • Embodiments of the invention are described with respect to an LTE-a system. However, other embodimentsmaybe implemented inLTE. HSxPA, WiFi, WiMax etc . , and mixed systems thereof , if a channel state indication may be requested from a terminal by a base station.
  • Achannel state indication gives feedback about a state of a certain channel, in particular a downlink channel.
  • a channel state information is specified inLTE.
  • other information relevant for estimating a state of a channel may be comprised in the channel state information.
  • channel state information may comprise a subset of the specified information only.
  • a terminal may comprise any kind of terminal that may be connected to a base station of the respective RAT such as user equipment, mobile phone, PDA, laptop, smartphone etc.
  • a base station may comprise any kind of base stations of the respective RAT such as NodeB, eNodeB, pico cell, femto cell, wireless access point etc. If not otherwise stated or otherwise made clear from the context, the statement that two entities are different means that they are differently addressed in the core network. It does not necessarily mean that they are based on different hardware. That is, each of the entities described in the present description may be based on a different hardware, or some or all of the entities may be based on the same hardware.
  • exemplary embodiments of the present invention provide, for example a terminal suchas auser equipment, or a component thereof, an apparatus embodying the same, a method for controlling and/or operating the same, and computer program(s) controlling and/or operating the same as well as mediums carrying such computer program(s) and forming computer program product (s) .
  • exemplaryembodiments of thepresent invention provide, for example a base station such as a NodeB or an eNodeB, or a component thereof, anapparatus embodying the same, a method for controlling and/or operating the same, and computer program (s) controlling and/oroperating the same as well as mediums carrying such computer program(s) and forming computer program product (s) .
  • Implementations of anyof the above describedblocks, apparatuses, systems, techniques or methods include, as non limiting examples, implementations as hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof. It is to be understood that what is described above is what is presently considered the preferred embodiments of the present invention. However, it should be noted that the description of the preferred embodiments is given by way of example only and that various modifications maybe made without departing from the scope of the invention as defined by the appended claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention a trait à un appareil comprenant : un moyen de détermination conçu pour déterminer le volume d'un champ de requête ; un moyen de décision servant à décider, pour chaque ensemble d'indicateurs d'état de canal configuré sur un terminal, si les indicateurs d'état de canal de l'ensemble configuré respectif vont faire l'objet d'une requête, tous les indicateurs d'état de canal de l'ensemble configuré respectif étant sur le point de faire l'objet d'une requête ou aucun de ces indicateurs n'étant sur le point de faire l'objet d'une requête, le moyen de décision étant destiné à décider pour un nombre maximal d'ensembles configurés, mais pas plus, qu'ils vont faire l'objet d'une requête, et ce nombre maximal correspondant au volume déterminé ; ainsi qu'un moyen de transmission prévu pour transmettre au terminal le champ de requête ayant le volume déterminé et indiquant tous les ensembles configurés pour lesquels le moyen de décision a décidé de faire une requête qui a pour objet leurs indicateurs d'état de canal respectifs.
EP12882377.0A 2012-08-01 2012-08-01 Volume configurable d'une « requête de csi » pour le déclenchement d'un retour de csi apériodique Withdrawn EP2880796A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2012/079506 WO2014019169A1 (fr) 2012-08-01 2012-08-01 Volume configurable d'une « requête de csi » pour le déclenchement d'un retour de csi apériodique

Publications (2)

Publication Number Publication Date
EP2880796A1 true EP2880796A1 (fr) 2015-06-10
EP2880796A4 EP2880796A4 (fr) 2016-03-30

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EP12882377.0A Withdrawn EP2880796A4 (fr) 2012-08-01 2012-08-01 Volume configurable d'une « requête de csi » pour le déclenchement d'un retour de csi apériodique

Country Status (2)

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EP (1) EP2880796A4 (fr)
WO (1) WO2014019169A1 (fr)

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US10608856B2 (en) 2016-06-16 2020-03-31 Samsung Electronics Co., Ltd. Transmission of reference signals in a communication system
CN109716842B (zh) * 2018-02-26 2020-06-26 Oppo广东移动通信有限公司 一种信息传输的方法、设备及计算机存储介质

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JP5668139B2 (ja) * 2010-07-26 2015-02-12 エルジー エレクトロニクス インコーポレイティド マルチキャリアアグリゲーションを支援する無線接続システムにおいて非周期的チャネル状態情報フィードバック方法
CN102594528B (zh) * 2011-01-10 2017-07-07 夏普株式会社 非周期信道状态信息反馈的触发方法和设备
CN102255694A (zh) * 2011-07-19 2011-11-23 电信科学技术研究院 信道状态信息传输方法和设备
CN102291223B (zh) * 2011-08-05 2014-03-12 电信科学技术研究院 信道状态信息反馈指示及反馈方法和设备

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EP2880796A4 (fr) 2016-03-30
WO2014019169A1 (fr) 2014-02-06

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