WO2012145891A1 - Appareil validant un canal pdcch spécifique d'un équipement d'utilisateur et équipement d'utilisateur destiné à identifier ce canal pdcch - Google Patents

Appareil validant un canal pdcch spécifique d'un équipement d'utilisateur et équipement d'utilisateur destiné à identifier ce canal pdcch Download PDF

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Publication number
WO2012145891A1
WO2012145891A1 PCT/CN2011/073281 CN2011073281W WO2012145891A1 WO 2012145891 A1 WO2012145891 A1 WO 2012145891A1 CN 2011073281 W CN2011073281 W CN 2011073281W WO 2012145891 A1 WO2012145891 A1 WO 2012145891A1
Authority
WO
WIPO (PCT)
Prior art keywords
pdcch
processor
cce
information
rss
Prior art date
Application number
PCT/CN2011/073281
Other languages
English (en)
Inventor
Fang-Chen Cheng
Jung Lee
Xiaobo Zhang
Original Assignee
Alcatel Lucent
Alcatel-Lucent Shanghai Bell 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 Alcatel Lucent, Alcatel-Lucent Shanghai Bell Co., Ltd. filed Critical Alcatel Lucent
Priority to PCT/CN2011/073281 priority Critical patent/WO2012145891A1/fr
Publication of WO2012145891A1 publication Critical patent/WO2012145891A1/fr

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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—Signaling for the administration of the divided path
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the present invention generally relates to telecommunications and, more particularly, to wireless communication systems.
  • PDCCH Physical Downlink Control Channel
  • DL downlink
  • R-PDCCH has been designed for the Relay backhaul.
  • R-PDCCH has FDM (Frequency Division Multiplexing) design to allow the control channel resource be partitioned in the unit of RB (Resource Block) separated from the data channel.
  • the first slot of R-PDCCH was designed for DL grant and the second slot of the R-PDCCH for UL (uplink) grant.
  • the fixed partition between DL and UL grant is to minimize the decoding delay of the DL grant, which would trigger DL PDSCH (Physical Downlink Sharing Channel) transmission in the specific subframe.
  • the R-PDCCH design simplifies the design of access grant but limits the flexibility and multiplexing capacity.
  • An object of the present invention is to improve the multiplexing capacity and the coverage performance of a base station, such as a Node B, an eNB (evolved Node B) or the like, with UE-specific PDCCH (U-PDCCH for short) design.
  • a UE-specific PDCCH is also referred to as user specific PDCCH.
  • the U-PDCCH design targets to group UEs with similar radio channel conditions, e.g. same expected precoding vector or same DL PMI (precoding Matrix Indicator), to share the CCE (control channel element) through multi-layer BF (beamforming).
  • the eNB would group the UEs based on l their CSI (Channel State Information) feedbacks.
  • the UE could decode the U-PDCCH based on the CSI values most recently feedback.
  • the multi-layer BF U-PDCCH design would be similar to MU-MIMO PDSCH design.
  • the BF feature in the U-PDCCH would improve the coverage of the base station and reduce the inter-cell interference from the neighboring cells.
  • the multi-layer spatial multiplexing capability of U-PDCCH design would allow spatial multiplexing of multiple downlink control channel information in the same CCE resource.
  • a UE-specific reference signals need to be sent along with DL control information.
  • an apparatus which is used in a base station, comprises a processor and a memory device associated with the processor, wherein the processor is configured to send DM RSs (demodulation reference signals) along with control information by a specified CCE (e.g. first CCE) of a PDCCH containing a plurality of CCEs.
  • a base station may be a Node B, an eNB or the like.
  • a PDCCH for the purpose of more multiplexing capacity, the PDCCH containing two CCEs or four CCEs or eight CCEs, respectively, with at least one of the multiple CCEs, for example the first CCE, being used to carry DM RSs and control information.
  • the DM RSs of the PDCCH are allocated in at least one REG (Resource Element Group) of said first CCE, while said control information is allocated in at least a first REG of said first CCE.
  • Each DM RS corresponds to a signal beam to a UE.
  • OCCs orthogonal cover code
  • the same REG(s) could be shared by multiple DM RSs for different UEs.
  • most (e.g., eight out of nine) REGs could be allocated to DM RSs, while the other REGs could be allocated to control information. With such configuration, the PDCCH is of good multiplexing capacity.
  • a UE (user equipment) device comprises a processor and a memory associated therewith, wherein the processor configured to, in a CONNECTED mode,
  • a UE device comprises a processor and a memory associated therewith, wherein the processor is configured to, in a CONNECTED mode,
  • Fig. l is a schematic diagram of a portion of a MIMO communication system according to an embodiment of the present invention.
  • Fig.2 illustrates three formats of a PDCCH according a design of the present invention
  • Fig.3 illustrates the assignment structure of a first CCE of a PDCCH according a design of the present invention
  • Fig.4 illustrates the framework of a normal subframe according to an embodiment of the present invention
  • Fig.5 illustrates the framework of a MBSFN subframe according to an embodiment of the present invention
  • Fig.6 illustrates a flowchart of the general procedure of user specific PDCCH assignment at UE side in a CONNECTED mode
  • Fig.7 illustrates another flowchart of the general procedure of user specific PDCCH assignment at UE side in a CONNECTED mode.
  • an embodiment of the present invention relates to a MIMO (Multiple Input Multiple Output) system 10 for enabling a UE-specific PDCCH 40 from a base station 20 the UEs 31 and 32.
  • the system 10 is, for example but not limited to, a LTE system or a LTE-A system.
  • the base station 20 may be a Node B, an eNB or the like.
  • An apparatus 22 used in or embedded in the base station 20 comprises a processor and a memory device associated with the processor, wherein the processor is configured to send DM RSs along with control information by a first CCE of the PDCCH 40 containing a plurality of CCEs.
  • a UE-specific PDCCH contains two CCEs; as defined in the format 2, a UE-specific PDCCH contains four CCEs; as defined in the format 3, a UE-specific PDCCH contains eight CCEs.
  • the blank blocks and the shadow blocks in Fig.2 are only intended to indicate the successive CCEs.
  • only one of the multiple CCEs of a UE-specific PDCCH, preferably the first or the last CCE, is used to carry DM RSs and control information.
  • the DM RSs of the PDCCH 40 are allocated in at least one REG of said first CCE, while said control information is allocated in at least a first REG of said first CCE.
  • the control information is allocated in at least a first REG of said first CCE.
  • eight out of nine REGs of said first CCE could be allocated to DM RSs, while the other REG could be allocated to control information.
  • Each DM RS corresponds to a signal beam to a UE.
  • OCCs orthogonal cover code
  • the same REG(s) could be shared by multiple DM RSs.
  • some DM RSs are four REs in length for supporting four transmitted antennas, and at most four of such DM RSs could share a same REG along with respective OCCs of four elements in length.
  • some DM RSs are eight REs in length for supporting eight transmitted antennas, and at most eight of such DM RSs could share a same pair of REGs along with respective OCCs of eight elements in length.
  • the PDCCH 40 is of good multiplexing capacity.
  • a UE may be equipped with multiple receiving antennas, there may be multiple DM RSs and respective OCCs allocated to a same UE.
  • the number of DM RSs and respective OCCs allocated to a UE are determined by a rank of the channel matrix observed by the UE.
  • the multiple DM RSs sharing the same REG or the same pair of REGs may be allocated to a same UE or different UEs.
  • the assignment of the OCC for each UE could be configured semi-statically through RRC signaling or dynamically through DL control region in a CCE of the PDCCH 40.
  • the processor of the apparatus 22 is further configured to send OCC assignment information associated with the DM RSs contained in the PDCCH 40 by RRC signaling.
  • the processor of the apparatus 22 is further configured to send dynamic OCC assignment information associated with the DM RSs contained in the PDCCH 40 by at least said first REG of said first CCE.
  • the control information contained in the PDCCH 40 may include the dynamic OCC assignment information associated with the DM RSs, UE(s) should decode the control information before decoding the DM RSs.
  • the PDCCH 40 may be precoded except for at least said first REG of said first CCE, in other words, the control information contained in the PDCCH 40 is not precoded.
  • the dynamic control information may relate to user allocation, MCS (modulation and coding scheme) or rank allocation.
  • the processor of the apparatus 22 is further configured to send dynamic control information by RRC signaling, wherein said dynamic control information comprises at least one of dynamic user allocation information for multi-user multiplexing in said PDCCH, dynamic MCS allocation information for said PDCCH and dynamic rank allocation information for precoding matrix.
  • the configuration of the dynamic MCS allocation information would allow the base station 20 to advantageously assign the MCS for the UEs with good channel condition.
  • the PDCCH 40 (U-PDCCH) is precoded at the transmitter of the base station 20.
  • U-PDCCHs for multiple users are spatially multiplexed in the same CCE resources by base station precoding, as shown in Fig. l .
  • the precoded U-PDCCH is demodulated by using UE-specific RS.
  • UE-specific RS Radio Resource Control
  • the apparatus 22 of the base station 20 is advantageously capable of allocating user specific PDCCH and legacy PDCCHs, such as those defined in Release 8/9/10, in a mix fashion.
  • the processor of the apparatus 22 is further configured to perform CCE allocation of user specific PDCCH along with legacy PDCCH in a same PDCCH region of a normal subframe.
  • Fig.4 illustrates the framework of such a normal subframe, wherein the diagonal blocks indicate the CCE resources allocated to legacy PCFICH (Physical Control Format Indicator Channel), PHICH (Physical HARQ Indicator Channel) and PDCCH, while the lateral-cut blocks indicate the CCE resources allocated to user specific PDCCH.
  • the UE specific PDCCH CCEs and other legacy control channel CCEs could go together through sub-block interleaver and have the results of interleaved user specific PDCCH.
  • the CCE allocation of the user specific PDCCH is transparent to legacy UEs, such as Release 8/9/10 UEs.
  • the legacy UEs could perform the normal blind decoding and consider the user specific PDCCH as one of the CRC error cases.
  • the processor of the apparatus 22 is further configured to allocate the user specific PDCCH in MBSFN (Multicast Broadcast Single Frequency Network) subframes in a non-interleaved fashion.
  • Fig.5 illustrates the framework of such a MBSFN subframe, wherein the diagonal blocks indicate the CCE resources allocated to legacy PCFICH, PHICH and PDCCH, while the lateral-cut blocks indicate the CCE resources allocated to user specific PDCCH.
  • the base station 20 could allocate a first symbol for legacy PCFICH, PHICH and PDCCH, while allocate multiple symbols for user specific PDCCH without interleaving.
  • the non-interleaved U-PDCCH could be configured by RRC to inform each UE the number of symbols assigned for non-interleaved U-PDCCH and the starting symbols of PDSCH transmission.
  • the non-interleaved U-PDCCH design would allow the UE to perform subband optimization in the MCS selection. More specifically, the non-interleaved PDCCH would optimize the MCS assignment information in the frequency selective radio channel.
  • Fig.6 illustrates a flowchart of the general procedure of user specific PDCCH assignment at UE side in a CONNECTED mode. More details will be described below in combination with the UE 31 , for example.
  • the procedure includes three steps 100, 102 and 104.
  • the UE 31 will receive and identify an indicator from higher signaling indicating a DL transmission mode supporting multi-layer beamforming along with a user specific PDCCH for DL grant.
  • the UE 31 will access DL control information using a PDCCH.
  • the UE 31 will determine layer mapping information of multi-layer beamforming and MCS level information according to a last reported RI and CQI, if no dynamic control element is detected.
  • the UE device 31 comprises a processor and a memory associated therewith, wherein the processor is configured to perform the above-mentioned steps 100, 102 and 104, in a CONNECTED mode.
  • Fig.7 illustrates another flowchart of the general procedure of user specific PDCCH assignment at UE side in a CONNECTED mode. More details will be described below in combination with the UE 32, for example.
  • the procedure includes three steps 1 10, 1 12 and 1 14.
  • the UE 32 will receive and identify an indicator from higher layer signaling indicating a DL transmission mode supporting multi-layer beamforming along with a user specific PDCCH for DL grant.
  • the UE 32 will access DL control information using a PDCCH.
  • the UE 32 will determine layer mapping information of multi-layer beamforming and MCS level information based on dynamic control information in said user specific PDCCH.
  • the UE device 32 comprises a processor and a memory associated therewith, wherein the processor is configured to perform the above-mentioned steps 110, 112 and 114, in a CONNECTED mode.
  • the processor of the UE device 31 or 32 is further configured to perform user specific PDCCH blind decoding with C-RNTI (Cell-Radio Network Temporary Identifier) or SPS-C-RNTI (Semi-Persistent Scheduling C-RNTI).
  • C-RNTI Cell-Radio Network Temporary Identifier
  • SPS-C-RNTI Semi-Persistent Scheduling C-RNTI
  • the processor of the UE device 31 or 32 is further configured to transmit on said user specific PDCCH according to C-RNTI or SPS-C-RNTI.
  • the user specific PDCCH (U-PDCCH) designs have the following features:
  • U-PDCCH The allocation of U-PDCCH is transparent to legacy (Release 8-10 UEs when they access the legacy control channels and shared channels.
  • the U-PDCCH supports all legacy DCI (Downlink Control Information) formats and additional DCI formats in the future.
  • the U-PDCCH reuses as much legacy PDCCH physical layer structure and design, such as CCE and aggregation level, as possible.
  • the U-PDCCH is designed to be available for an evolved UE at every subframe and is transparent to legacy UEs.

Abstract

La présente invention concerne un appareil destiné à valider un canal PDCCH spécifique d'un équipement d'utilisateur et un équipement d'utilisateur destiné à identifier ce canal PDCCH. Selon un mode de réalisation, un appareil utilisé dans une station de base ou intégré à celle-ci comprend un processeur et un dispositif de mémoire associé au processeur, le processeur étant configuré pour envoyer des DM RS avec des informations de commande à l'aide d'un premier CCE d'un PDCCH contenant une pluralité de CCE. Les mécanismes de canal PDCCH spécifique à l'équipement d'utilisateur selon la présente invention offrent des capacités améliorées de couverture et de multiplexage ainsi qu'une bonne rétrocompatibilité avec les protocoles anciens comme LTE version 8-10.
PCT/CN2011/073281 2011-04-25 2011-04-25 Appareil validant un canal pdcch spécifique d'un équipement d'utilisateur et équipement d'utilisateur destiné à identifier ce canal pdcch WO2012145891A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2011/073281 WO2012145891A1 (fr) 2011-04-25 2011-04-25 Appareil validant un canal pdcch spécifique d'un équipement d'utilisateur et équipement d'utilisateur destiné à identifier ce canal pdcch

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Application Number Priority Date Filing Date Title
PCT/CN2011/073281 WO2012145891A1 (fr) 2011-04-25 2011-04-25 Appareil validant un canal pdcch spécifique d'un équipement d'utilisateur et équipement d'utilisateur destiné à identifier ce canal pdcch

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WO2012145891A1 true WO2012145891A1 (fr) 2012-11-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114745086A (zh) * 2017-03-24 2022-07-12 韦勒斯标准与技术协会公司 无线通信系统中发送和接收控制信道的方法、装置和系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010013959A2 (fr) * 2008-07-30 2010-02-04 Lg Electronics Inc. Procédé et dispositif de réception de données dans un système de communications sans fil
WO2010117240A2 (fr) * 2009-04-10 2010-10-14 Lg Electronics Inc. Procédé et appareil permettant de transmettre un signal de référence dans un système de communication sans fil
CN101964676A (zh) * 2009-07-22 2011-02-02 中兴通讯股份有限公司 中继链路下行解调参考信号的发送方法、基站及中继站

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010013959A2 (fr) * 2008-07-30 2010-02-04 Lg Electronics Inc. Procédé et dispositif de réception de données dans un système de communications sans fil
WO2010117240A2 (fr) * 2009-04-10 2010-10-14 Lg Electronics Inc. Procédé et appareil permettant de transmettre un signal de référence dans un système de communication sans fil
CN101964676A (zh) * 2009-07-22 2011-02-02 中兴通讯股份有限公司 中继链路下行解调参考信号的发送方法、基站及中继站

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114745086A (zh) * 2017-03-24 2022-07-12 韦勒斯标准与技术协会公司 无线通信系统中发送和接收控制信道的方法、装置和系统

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