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WO2012075809A1 - Procédé et dispositif de communication - Google Patents

Procédé et dispositif de communication Download PDF

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Publication number
WO2012075809A1
WO2012075809A1 PCT/CN2011/076928 CN2011076928W WO2012075809A1 WO 2012075809 A1 WO2012075809 A1 WO 2012075809A1 CN 2011076928 W CN2011076928 W CN 2011076928W WO 2012075809 A1 WO2012075809 A1 WO 2012075809A1
Authority
WO
WIPO (PCT)
Prior art keywords
bitmap
carriers
triggering
trigger
carrier
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.)
Ceased
Application number
PCT/CN2011/076928
Other languages
English (en)
Inventor
Fredrik Berggren
Yuhua Chen
Jianghua Liu
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.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
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 Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2012075809A1 publication Critical patent/WO2012075809A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • Channel State Information (or alternatively, Channel Quality Information, (CQI)) reports are sent from the mobile terminal to the base station, including information of the downlink channel quality useful in the scheduling of data packets.
  • CQI Channel Quality Information
  • reports are sent from the mobile terminal to the base station, including information of the downlink channel quality useful in the scheduling of data packets.
  • 3GPP LTE one type of reports contains aperiodic CSI, and such reports are scheduled by the radio base station
  • eNodeB uplink (UL) grant transmitted in the
  • aggregation is supported, wherein transmission may occur on multiple downlink carriers (also referred to as cells) which necessitate CSI reports from multiple downlink carriers.
  • downlink carriers also referred to as cells
  • Carrier aggregation introduces issues for the aperiodic CSI reporting.
  • a cell is a combination of downlink and optionally uplink resources.
  • the linking between the carrier frequency of the downlink resources and the carrier frequency of the uplink resources is indicated in the system information transmitted on the downlink resources.
  • a first issue is that aperiodic CSI report triggering requires the transmission of an UL grant in the Physical Downlink
  • a third issue is a potential ambiguity of the carriers
  • the eNodeB configures a UE with a set of carriers to be used for carrier aggregation.
  • Reconfiguration of this set may be needed, e.g., addition or removal of carriers and during the reconfiguration period, the eNodeB does not know whether the UE has switched to the new configuration, or if it is still assuming the old configuration. This may incur ambiguity concerning which carriers that have been triggered for aperiodic CSI, which in turn could lead to losses of CSI reports and jeopardize the data scheduling.
  • the first two issues could be handled by adding triggering bits in the UL grants.
  • one PDCCH transmission i.e., one UL grant
  • This DL PDCCH control overhead would be unavoidable and remain even if no aperiodic CSI reporting is triggered.
  • An alternative is to not increase the number of triggering bits and instead assume that upon a positive CSI trigger, aperiodic reports should always be given for all DL carriers.
  • RRC Radio Resource Control
  • the solution (always triggering all carriers) . In that sense, the solution can provide a certain degree of flexibility
  • ⁇ reports can be triggered for a single carrier
  • Aperiodic CSI reporting is enabled by a single CSI trigger bit included in the UL grant which is transmitted by the PDCCH.
  • a mobile terminal (user equipment, UE) may search for channels where it can receive instructions from a base station, e.g., the physical downlink control channel (PDCCH) .
  • the mobile terminal may search for such channels in two different search spaces, namely a common search space and a UE-specific search space. These search spaces constitutes different downlink time-frequency resources and search spaces may or may not be overlapping.
  • search spaces constitutes different downlink time-frequency resources and search spaces may or may not be overlapping.
  • all mobile terminals would search for information that would be common to all terminals.
  • UE-specific control information could also be transmitted in the common search space.
  • the detected control information only applies to the given mobile terminal.
  • Information that is communicated in the UE-specific search space is such
  • Trigger ⁇ 00' means that no reporting should be done
  • trigger ⁇ 01' indicates the downlink component carrier (DL CC) that is SIB2-linked to the uplink component carrier (UL CC) transmitting the CSI report and the meanings of trigger ⁇ 10' and ⁇ 11' are configurable by Radio Resource Control (RRC) .
  • RRC Radio Resource Control
  • trigger ⁇ 01' the same behaviour of triggering a single carrier as in Rel-8/9 is maintained, while triggers ⁇ 10' and ⁇ 11' could enable triggering of multiple carriers.
  • configured carriers can be either activated or deactivated.
  • the UE is only transmitting the aperiodic CSI report for activated carriers among the carriers that have been triggered.
  • bitmap size is equal to the maximum number of carriers that can be aggregated, N. This setup will minimize the resources needed to do the
  • a mobile terminal can be configured with up to N carriers.
  • some of the 2 K trigger states may correspond to some predefined triggering rules (such as triggering by SIB-2 linkage) and not be associated with a bitmap.
  • the bitmap is only used to determine a set of triggered carriers when the associated trigger state is valid for the given bitmap. That is to say, that any state of the trigger bit(s) in the
  • downlink control channel that is not associated with a bitmap is denoted as not valid for using a bitmap for the triggering of channel state information reports. If there for instance are four states and state ⁇ 00' represents no transmission of a report, state ⁇ 01' represents transmission of a report for the downlink carrier that is linked to the uplink carrier on which the report should be sent and state ⁇ 10' and ⁇ 11' represents transmission according to a bitmap, then states ⁇ 00' and ⁇ 01' are not valid for the bitmap in the sense of that they do not trigger reports according to such a bitmap. Correspondingly, states ⁇ 10' and ⁇ 11' are valid for the bitmap since they would trigger a report according to their respectively associated bitmap.
  • RRC Radio Resource Control
  • a bitmap of length N is used since it can be realized that this is the smallest bitmap that can encompass the 2 N -1 combinations.
  • a bitmap can be defined as where
  • index i refers to an ordinal number of a carrier.
  • bitmap would contain zeros for all remaining indices i. It would further be advantageous if the definition of the bitmap avoids any ambiguity with regards to the configured set of component carriers. In that way, aperiodic CSI reports could be triggered even during a period under which the set of carriers is reconfigured. That property would be an advantage for the system since it may allow scheduling of data and thus maintain system performance. This implies that the
  • bitmap should not depend on the set of configured carriers. Equivalently, the carrier associated with position i in the bitmap should not change depending on carrier configuration status. Furthermore, an advantage is that this also makes it possible to independently configure the bitmap and the set of configured carriers. Thereto, as long as the carriers indicated by the bitmap comprises a subset of the carriers that may be perceived by the UE as configured during the reconfiguration period (i.e., the union of the set of carriers in the old configuration and the set of carriers in the new configuration) there is no ambiguity in triggering according to the bitmap. This is an advantage to the system since it would reduce the need for reconfiguring the bitmaps. In a second embodiment, it is realized that this can be facilitated by defining a bitmap of length M, wherein index i refers to carrier i, such that the bitmap is defined as
  • index i in the bitmap always refers to a carrier with index i, regardless if that carrier is configured or not, there is no ambiguity in interpreting the bitmap.
  • bitmaps where the association between the carrier index and the position follows some arbitrary but known rule.
  • position i in the bit map corresponds to carrier index M-l-i.
  • a bitmap of length N could represent 2 N combinations of carriers for triggering.
  • a bitmap of length M could represent 2 M combinations of carriers for triggering.
  • Trigger ⁇ 01' facilitates
  • Said one state of said bitmap may be the all-zero state of said bitmap, as was also the case of the previous SIB-2 linkage example above, and can be triggered by one triggering bit being sent in a common search space.
  • the control signalling overhead can be reduced.
  • B' includes the last H indices i of b j
  • bitmap of size M could be used where the all-zero state refers to triggering by SIB-2 linkage when the trigger state is ⁇ 1' .
  • At least one of the trigger states of said at least one triggering bit is associated with at least one bitmap, wherein said bitmap represents a set of carriers for which aperiodic channel state information should be reported.
  • Embodiment e a method as in embodiment c, where said one state is the all-zero state of said bitmap.
  • Embodiment k a method as in embodiment a, where the bitmap is of length M.
  • Embodiment 1 a method as in embodiment a, where the bitmap is of length N.
  • Embodiment m a method as in embodiment a, where the state of said associated bitmap is configured by RRC .
  • Embodiment n a method as in embodiment a, where the set of carriers that aperiodic channel state information should be reported is explicitly determined from said bitmap.
  • Embodiment q a method as in embodiment a, where one bitmap is associated with triggering bits of said downlink control channel transmitted through a common search space.
  • Embodiment r a method as in embodiment a, where two bitmaps are associated with triggering bits of said downlink control channel transmitted through a UE-specific search space.
  • the invention is applicable to carrier aggregation.

Landscapes

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

Abstract

La présente invention se rapporte à un procédé adapté pour déclencher des rapports de données d'état de canal apériodiques dans un système de communication cellulaire utilisant l'agrégation de porteuses. Le procédé selon l'invention est caractérisé en ce qu'il consiste : - à transmettre au moins un bit de déclenchement dans un canal de contrôle sur la liaison descendante, ledit ou lesdits bits de déclenchement correspondant à une pluralité d'états de déclenchement; - à associer au moins un des états de déclenchement dudit ou desdits bits de déclenchement à au moins un topogramme binaire comprenant un nombre de bits correspondant à des états de topogramme binaire; - à déterminer, à partir dudit topogramme binaire, quand ledit ou lesdits états de déclenchement associés sont valides pour ledit topogramme binaire, un ensemble de porteuses pour lequel des données d'état de canal apériodiques doivent être rapportées; - à organiser la transmission de rapports de données d'état de canal dudit ensemble de porteuses déterminé. L'invention se rapporte d'autre part à un terminal mobile et à une station de base.
PCT/CN2011/076928 2010-12-08 2011-07-07 Procédé et dispositif de communication Ceased WO2012075809A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2010000294 2010-12-08
SEPCT/SE2010/000294 2010-12-08

Publications (1)

Publication Number Publication Date
WO2012075809A1 true WO2012075809A1 (fr) 2012-06-14

Family

ID=46206585

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/076928 Ceased WO2012075809A1 (fr) 2010-12-08 2011-07-07 Procédé et dispositif de communication

Country Status (1)

Country Link
WO (1) WO2012075809A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2490430A (en) * 2012-05-11 2012-10-31 Renesas Mobile Corp Configuring an uplink data channel for multi-cell periodic feedback of channel state information
EP3253112A4 (fr) * 2015-01-29 2018-07-04 Ntt Docomo, Inc. Terminal utilisateur, station de base sans fil, système de communication sans fil, et procédé de communication sans fil
WO2019242737A1 (fr) * 2018-06-21 2019-12-26 Mediatek Inc. Configuration de mesure de csi, et signalisation de capacité d'ue

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101651996A (zh) * 2009-09-17 2010-02-17 中兴通讯股份有限公司 一种分量载波的索引和控制格式指示值的传输方法及系统
CN101826949A (zh) * 2010-04-01 2010-09-08 中兴通讯股份有限公司 载波聚合场景下非周期反馈的方法和系统
CN101895923A (zh) * 2010-06-11 2010-11-24 新邮通信设备有限公司 载波聚合通信系统中的功率余量报告方法和用户设备

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101651996A (zh) * 2009-09-17 2010-02-17 中兴通讯股份有限公司 一种分量载波的索引和控制格式指示值的传输方法及系统
CN101826949A (zh) * 2010-04-01 2010-09-08 中兴通讯股份有限公司 载波聚合场景下非周期反馈的方法和系统
CN101895923A (zh) * 2010-06-11 2010-11-24 新邮通信设备有限公司 载波聚合通信系统中的功率余量报告方法和用户设备

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2490430A (en) * 2012-05-11 2012-10-31 Renesas Mobile Corp Configuring an uplink data channel for multi-cell periodic feedback of channel state information
GB2490430B (en) * 2012-05-11 2013-08-28 Renesas Mobile Corp Method,apparatus and computer program for controlling a user equipment
EP3253112A4 (fr) * 2015-01-29 2018-07-04 Ntt Docomo, Inc. Terminal utilisateur, station de base sans fil, système de communication sans fil, et procédé de communication sans fil
WO2019242737A1 (fr) * 2018-06-21 2019-12-26 Mediatek Inc. Configuration de mesure de csi, et signalisation de capacité d'ue
CN111247829A (zh) * 2018-06-21 2020-06-05 联发科技股份有限公司 Csi测量配置和ue能力信令
US11201689B2 (en) 2018-06-21 2021-12-14 Mediatek Inc. CSI measurement configuration and UE capability signaling
TWI769444B (zh) * 2018-06-21 2022-07-01 聯發科技股份有限公司 使用者設備及其無線通訊方法
CN111247829B (zh) * 2018-06-21 2023-12-19 联发科技股份有限公司 用户设备及其无线通信方法

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