WO2013113155A1 - Configuration pour détection de canal d'indicateur harq physique - Google Patents

Configuration pour détection de canal d'indicateur harq physique Download PDF

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Publication number
WO2013113155A1
WO2013113155A1 PCT/CN2012/070803 CN2012070803W WO2013113155A1 WO 2013113155 A1 WO2013113155 A1 WO 2013113155A1 CN 2012070803 W CN2012070803 W CN 2012070803W WO 2013113155 A1 WO2013113155 A1 WO 2013113155A1
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WO
WIPO (PCT)
Prior art keywords
downlink
subframe
grant
user equipments
uplink
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Ceased
Application number
PCT/CN2012/070803
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English (en)
Inventor
Chunyan Gao
Erlin Zeng
Shuang TAN
Jing HAN
Wei Hong
Wei Bai
Haiming Wang
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Renesas Electronics Corp
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Renesas Mobile Corp
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Priority to PCT/CN2012/070803 priority Critical patent/WO2013113155A1/fr
Publication of WO2013113155A1 publication Critical patent/WO2013113155A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communications and more specifically to configuring a detection of a PHICH (or E-PHICH) for monitoring a PUSCH to reduce a resource reservation for the E-PHICH, e.g., in LTE-A systems.
  • eNB eNodeB evolved node B /base station in an E-UTRAN system
  • E-PDCCH evolved physical downlink control channel
  • E-PDSCH evolved physical downlink shared channel
  • DL HARQ-ACK signalling is transmitted on a PHICH.
  • a UE is configured to receive UL grants on the evolved PDCCH, e.g., due to operating in an extension carrier, due to ICIC or due to being unable to access a wide band PDCCH, a new mechanism may be required for DL HARQ-ACK signalling and the new mechanism for DL HARQ-ACK is identified as E-PHICH, e.g., see Rl-11 682 "Views on Enhanced PHICH, Ericsson, 3 GPP TSG-RAN WG1 #67, San Francisco, 14 th -18 th November 201 1, and Rl-114067 "PHICH Enhancement)", Alcatel-Lucent, 3 GPP TSG-RAN WG1 #67, San Francisco, 14 th - 18 th November 2011.
  • the design of the E-PDCCH is not decided yet, and the E-PHICH design may depends on the E-PDCCH design, e.g., whether to use precoded or non-precoded RS for demodulation, how to multiplex with E-PDCCH and E-PDSCH.
  • the E-PHICH is still expected to be in multiple PRBs.
  • the resource used by the E-PHICH may cause puncturing of the E-PDCCH/E-PDSCH which will degrade the performance; therefore, keeping the resource for the E-PHICH at a minimum is desired.
  • the E-PHICH is needed in case the access to normal PDCCH is not available, and reduction in the E-PHICH resource reservation is desired.
  • the PHICH resource comprises some reserved REs in the first 3 OFDM symbols in the control region, and each PHICH resource is linked implicitly to the scheduled PUSCH resource and the cyclic shift used for UL DMRS (see 3 GPP TS 36.213 V10.2.0 (20101-06).
  • E-PHICH was mentioned in some 3 GPP contributions (see Rl -1 13682 "Views on Enhanced PHICH, Ericsson, 3 GPP TSG-RAN WG1 #67, San Francisco, 14 th -18 th November 2011 , and Rl-114067 "PHICH Enhancement)", Alcatel-Lucent, 3 GPP TSG-RAN WG1 #67, San Francisco, 14 th -l 8 th November 2011).
  • Rl -1 13682 Views on Enhanced PHICH, Ericsson, 3 GPP TSG-RAN WG1 #67, San Francisco, 14 th -18 th November 2011
  • Rl-114067 PHICH Enhancement
  • a method comprising: receiving by a user equipment a configuration instruction from a network element not to detect a physical hybrid automatic repeat request indicator channel in at least one downlink subframe; detecting the at least one downlink subframe; and if an uplink grant or a downlink grant is detected in the at least one downlink subframe, determining if a retransmission of an uplink subframe is needed using feedback information regarding the uplink subframe, the feedback information being comprised in the received uplink or downlink grant.
  • a method comprising: configuring by a network element one or more user equipments of a plurality of user equipments not to monitor a physical hybrid automatic repeat request indicator channel in at least one downlink subframe; and sending to at least one of the one or more user equipments a downlink subframe comprising a downlink grant or an uplink grant indicating whether an uplink retransmission for a received uplink subframe is needed.
  • an apparatus comprises: at least one processor and a memory storing a set of computer instructions, in which the processor and the memory storing the computer instructions are configured to cause the apparatus to: receive a configuration instruction from a network element not to detect a physical hybrid automatic repeat request indicator channel in at least one downlink subframe; detect the at least one downlink subframe; and if an uplink grant or a downlink grant is detected in the at least one downlink subframe, determine if a retransmission of an uplink subframe is needed using feedback information regarding the uplink subframe, the feedback information being comprised in the received uplink or downlink grant.
  • an apparatus comprising: at least one processor and a memory storing a set of computer instructions, in which the processor and the memory storing the computer instructions are configured to cause the apparatus to: configure one or more user equipments of a plurality of user equipments not to monitor a physical hybrid automatic repeat request indicator channel in at least one downlink subframe; and sending to at least one of the one or more user equipments a downlink subframe comprising a downlink grant or an uplink grant indicating whether an uplink retransmission for a received uplink subframe is needed.
  • a computer readable medium comprising a set of instructions, which, when executed on a user equipment causes the user equipment to perform the steps of: receiving a configuration instruction from a network element not to detect a physical hybrid automatic repeat request indicator channel in at least one downlink subframe; detecting the at least one downlink subframe; and if an uplink grant or a downlink grant is detected in the at least one downlink subframe, determining if a retransmission of an uplink subframe is needed using feedback information regarding the uplink subframe, the feedback information being comprised in the received uplink or downlink grant.
  • a computer readable medium comprising a set of instructions, which, when executed on a network element causes the network element to perform the steps of: configuring one or more user equipments of a plurality of user equipments not to monitor a physical hybrid automatic repeat request indicator channel in at least one downlink subframe; and sending to at least one of the one or more user equipments a downlink subframe comprising a downlink grant or an uplink grant indicating whether an uplink retransmission for a received uplink subframe is needed.
  • Figure 1 is a time diagram illustrating different mode of operation of HARQ-ACK feedback using E-PHICH, and DL and UL grants for one UE, according to embodiments of the invention
  • Figures 2-3 are flow charts demonstrating implementation of exemplary embodiments of the invention.
  • Figure 4 is a block diagram of wireless devices for practicing exemplary embodiments of the invention.
  • a new method, apparatus, and software related product are presented for configuring a detection of a E- PHICH (or PHICH in general) in DL for monitoring a PUSCH to reduce resource reservation for the PHICH and correspondingly reduce an impact on detection of (E-)PDCCH and (E-)PDSCH, e.g., in LTE-A systems.
  • UEs may be configured (e.g., by an eNB) to detect E-PHICH or not to detect: the configuration can be not to detect E-PHCIH at all, or always to detect it, or to detect only in some subframes.
  • the configuration may be UE specific or common to a group of UEs.
  • a UE is configured not to detect E-PHICH in a DL subframe #n, and if according to the defined HARQ timing the UE needs to detect a HARQ-ACK information in the same subframe, then the UE will try to detect UL and/or DL grant in the subframe #n which will provide the desired HARQ (or AC /NACK/DTX) information.
  • UE When there is no UL grant but a DL grant is detected in the subframe #n, UE should obtain the HARQ (feedback) information via the DL grant.
  • DL grant' s DCI in the UE specific search space may be extended by N bits to convey the HARQ information, where N is a positive integer.
  • the retransmission may be performed according to non-adaptive mechanism using predefined UL resources and other transmission parameters.
  • some bit(s) of the DL grant's DCI may be reinterpreted/redefined to provide the desired HARQ (ACK/NACK) information for the corresponding UL transmission with no E-PHICH configured in this DL subframe #n.
  • the reinterpreted bit(s) can be resource allocation type field, e.g., in DCI format 1 , the resource allocation type can be
  • the localized/distributed VRB assignment flag can be redefined as follows:
  • the UE can assume that an ACK is sent by eNB, i.e., no retransmission is needed.
  • the UE will transmit PUSCH in the following UL subframe (e.g., subframe n+4) based on the UL grant message, which may contain resource assignment, modulation and coding scheme (MCS), new data indicator (NDI), etc.
  • MCS modulation and coding scheme
  • NDI new data indicator
  • the decision about retransmission or sending a new transmission in this following UL subframe n+4 can be made based on NDI.
  • the NDI bit can implicitly indicate ACK NACK, i.e. "new data” implies ACK and "non-new data” implies NACK. If the UL grant is provided by the eNB, no HARQ information is appended to the DL grant.
  • the UE will know when and how to transmit uplink data, except in the case of non-adaptive retransmission where the UE can retransmit data according to ACK/NACK information and a predefined schedule for the non-adaptive retransmission. But even for the non-adaptive retransmission, the UL grant can be used to schedule UL retransmission with a higlier priority than ACK/NACK and the cost of higher overhead.
  • a network element such as eNB may configure one or more UEs of a plurality of UEs served by the eNB not to monitor or detect the E-PHICH (more generally PHICH) . Instead these one or more UEs would detect in a downlink subframe a downlink grant and/or an uplink grant to determine at least if an uplink retransmission needs to be performed. Then the eNB sends to each of the one or more user equipments a DL subframe comprising an
  • the eNB can further configure one or more other user equipments of the plurality of user equipments to monitor the PHICH and to process the ACK NACK/DTX information in a normal way.
  • each UE served by the eNB may be configured (by receiving an appropriate instruction from the eNB) not to monitor/detect the E-PHICH in at least one downlink subframe.
  • the UE may determine if the uplink re- transmission is needed.
  • the uplink grant comprises at least information for sending a next uplink subframe which may a retransmission or a new transmission subframe, e.g., based on the ACK/NACK/DTX comprised in the DL grant.
  • E-PHICH resource can be reserved considering (but not being limited to) the following factors: a) how many UEs can bear with non-adaptive HARQ transmission; b) how many UEs have high DL and UL traffic.
  • the network element such as eNB may assign a DL resource to the PHICH, such that the configuration of the PHICH for the UEs described herein may be based on the collected information and on the assigned resource for the PHICH as further described herein.
  • the E-PHICH can be embedded in a DL grant as it is likely that the UE will have the DL grant in a large portion of the DL sub frames.
  • the UL grant can be sent in case no DL grant available in corresponding subframes or change of MCS/resource allocation is needed. It is assumed that no matter how the ACK/NACK for PUSCH is sent in E-PHICH or DL UL grant, the same HARQ timing may be used, for example it can be 4ms HARQ delay, but for the TDD system it can be longer than 4ms.
  • the configuration for the E-PHICH detection may be subframe dependent, e.g., some UEs may be configured to detect the E-PHICH only in odd subframes, while other UEs may be configured to detect the E-PHICH only in even subframes, or some UEs can be configured not to detect the E-PHICH at all as discussed herein.
  • the UEs configured not to detect E-PHICH, if it has PUSCH in a subframe n-4, it will detect the DL grant in a subframe n assuming that HARQ information is embedded there which will cause a larger DCI size or reinterpretation of some field.
  • E-PHICH resource can be a multiple- to-one mapping, i.e., multiple UL PRB index map to same E-PHICH resource.
  • the collision can be avoided by sending HARQ information for some UEs in the DL or UL grant rather than an E-PHICH.
  • Figure 1 shows a time diagram illustrating different modes of operation of
  • the UE In a time period between t 0 and ti with a low communication traffic for PUSCH subframes 1 through M, the UE is configured to detect E-PHICH with subsequent retransmission (if needed) using existing mechanism.
  • the UE In a time period between ti and t 2 with a high communication traffic for PUSCH subframes M+l through M+N, the UE is configured to not detect the E-PHICH and the eNB add HARQ-ACK feedback information in DL grant for detection by the UE with subsequent retransmission (if needed) using non-adaptive mechanism for retransmission.
  • the UE In a time period between t 2 and t 3 with a less communication traffic (than in the time period between t t and t 2) for PUSCH subframes M+N+l through M+P, the UE is configured to not detect the E-PHICH and the eNB add HARQ-ACK feedback information in UL grant for detection by the UE with subsequent retransmission (if needed) using adaptive mechanism for retransmission as explained herein.
  • the UE In a time period between t3 and with a high quality of transmission (low SNR) with a relatively low communication traffic for PUSCH subframes M+P+l through M+S, the UE is configured to not detect the E-PHICH and the eNB does not add acknowledgement feedback information in UL or DL grant (or UL and/or DL grants are not sent) no retransmission is assumed by the UE.
  • N, P and S are integers and S>P>N>M>1.
  • Figure 2 shows an exemplary flow chart demonstrating implementation of some embodiments of the invention by a UE. It is noted that the order of steps shown in Figure 2 is not required, so in principle the various steps may be performed out of the illustrated order. Also certain steps may be skipped, different steps may be added or substituted, or selected step/steps or groups of steps may be performed separately.
  • a first step 40 the UE receives a configuration instruction from a serving eNB regarding detecting or not detecting (E)-PHICH in DL subframe(s).
  • the UE sends a PUSCH in UL subframe n-4 to the eNB.
  • the UE receives a DL subframe n from the eNB.
  • a next logical step 46 it is determined whether the UE is configured to detect the (E)-PHICH. If that is not the case, in a next step 48, the UE detects DL grant or UL grant (comprising ACK/NACK feedback information) in the DL subframe n and the process goes to step 52. However, if it is determined that the UE is configured to detect the (E)-PHICH, in a next step 50, the UE detects (E)-PHICH on a configured resource. In a next step 52, the UE determines whether retransmission or new transmission needs to be sent in UL subframe n+4 using the UL grant if detected based on feedback information comprised in the DL or UL grant, as described herein.
  • Figure 3 shows an exemplary flow chart demonstrating implementation of some embodiments of the invention performed by the eNB. It is noted that the order of steps shown in Figure 3 is not required, so in principle the various steps may be performed out of the illustrated order. Also certain steps maybe skipped, different steps maybe added or substituted, or selected step/steps or groups of steps may be performed separately.
  • the eNB configures one or more UEs of a plurality of UEs not to detect (E)-PHICH in DL subframe(s).
  • the eNB configures one or more other UEs of the plurality of UEs to monitor/detect (E)-PHICH in DL subframe(s).
  • a next step 64 the eNB sends to at least one of the one or more user equipments a downlink subframe comprising a DL grant or an UL grant comprising feedback information on the received UL subframe, for providing an indication whether an UL retransmission for the received uplink subframe is needed based on the feedback information.
  • the eNB sends to at least one of the one or more other UEs a DL subframe comprising (E)-PHICH for providing an indication whether an UL retransmission for the received UL subframe is needed.
  • steps 60 and 62 under different traffic conditions and/or different UEs added are performed again, and the process goes to step 64.
  • Figure 4 shows an example of a block diagram demonstrating LTE devices comprised in a network 10 including an eNB 80, and UEs 82 and 84, according to an embodiment of the invention.
  • Figure 4 is a simplified block diagram of various electronic devices that are suitable for practicing the exemplary embodiments of this invention, e.g., in reference to Figures 1-3, and a specific manner in which components of an electronic device are configured to cause that electronic device to operate.
  • Each of the UEs 82 and 84 may be implemented as a mobile phone, a wireless communication device, a camera phone, a portable wireless device and the like.
  • the eNB 80 comprises at least one transmitter 80a at least one receiver 80b ; at least one processor 80c at least one memory 80d and a DRX control application module 80e.
  • the transmitter 80a and the receiver 80b and corresponding antennas may be configured to provide wireless communications with the UEs 82 and 84 according to the embodiment of the invention.
  • the transmitter 80a and the receiver 80b may be generally means for transmitting/receiving and may be implemented as a transceiver, or a structural equivalence thereof. It is further noted that the same requirements and considerations are applied to transmitters and receivers of the devices 82 and 84.
  • the eNB 80 may further comprise communicating means such as a modem 80f, e.g., built on an RF front end chip of the eNB 80, which also carries the TX 80a and RX 80b for bidirectional wireless communications wireless links 81a and 81b (for implementing/facilitating steps 40-50 in Figure 2 and steps 60-66 in Figure 3) with the devices 82 and 84 respectively.
  • a modem 80f e.g., built on an RF front end chip of the eNB 80, which also carries the TX 80a and RX 80b for bidirectional wireless communications wireless links 81a and 81b (for implementing/facilitating steps 40-50 in Figure 2 and steps 60-66 in Figure 3) with the devices 82 and 84 respectively.
  • a similar concept is applicable to the devices 82and 84 shown in Figure 4.
  • the at least one memory 80d may include any data storage technology type which is suitable to the local technical environment, including but not limited to semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, removable memory, disc memory, flash memory, DRAM, SRAM, EEPROM and the like.
  • the processor 80c include but are not limited to general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and multi-core processors. Similar embodiments are applicable to memories and processors in other devices
  • the PHICH configuring application module 80e may provide various instructions for performing steps 60-68 shown in Figure 3.
  • the module 80e may be implemented as an application computer program stored in the memory 80d, but in general it may be implemented as software, firmware and/or hardware module or a combination thereof.
  • a software related product such as a computer readable memory (e.g., non-transitory computer readable memory), computer readable medium or a computer readable storage structure comprising computer readable instructions (e.g., program instructions) using a computer program code (i.e., the software or firmware) thereon to be executed by a computer processor.
  • module 80e may be implemented as a separate block or may be combined with any other module/block of the eNB 80, or it may be split into several blocks according to their functionality.
  • the devices 82 and 84 may have similar components as the eNB 80, as shown in Figure 4, so that the above discussion about components of the LPN 80 is fully applicable to the components of the devices 82, 84 and 86.
  • the retransmission scheduling application module 83 in the UEs 82 and 84 may provide/facilitate various instructions for performing steps 40-52 in Figure 2.
  • 83 may be implemented as an application computer program stored in the memory 85, but in general it may be implemented as software, firmware and/or hardware module or a
  • one embodiment may be implemented using a software related product such as a computer readable memory (e.g., non-transitory computer readable memory), computer readable medium or a computer readable storage structure comprising computer readable instructions (e.g., program instructions) using a computer program code (i.e., the software or firmware) thereon to be executed by a computer processor.
  • the module 83 may be implemented as a separate block or may be combined with any other module/block of the UEs 82 or 84, or it may be split into several blocks according to their functionality.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La spécification et les dessins de l'invention présentent un nouveau procédé, un nouvel appareil et un nouveau produit logiciel (par exemple, une mémoire lisible par ordinateur) pour configurer une détection d'un E-PHICH (ou d'un PHICH d'une manière générale) en DL pour surveiller un PUSCH afin de réduire une réservation de ressource pour le PHICH et de réduire d'une manière correspondante un impact sur la détection d'un (E-)PDCCH et d'un (E-)PDSCH, par exemple dans des systèmes LTE-A. Les UE peuvent être configurés (par exemple, par un eNB) pour détecter un E-PHICH ou ne pas le détecter : la configuration peut être de ne pas détecter du tout E-PHICH, ou de le détecter toujours, ou de le détecter seulement dans certaines sous-trames. La configuration peut être spécifique d'un UE ou commune à un groupe d'UE. Si un UE est configuré pour ne pas détecter E-PHICH dans une sous-trame DL n° n, et si, conformément au positionnement temporel HARQ défini, l'UE doit détecter des informations HARQ-ACK dans la même sous-trame, alors l'UE essayera de détecter une autorisation UL et/ou DL dans la sous-trame n° n qui fournira les informations HARQ (ou ACK/NACK/DTX) souhaitées.
PCT/CN2012/070803 2012-01-31 2012-01-31 Configuration pour détection de canal d'indicateur harq physique Ceased WO2013113155A1 (fr)

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US20130265949A1 (en) * 2012-04-10 2013-10-10 Industrial Technology Research Institute Method of Handling HARQ Feedback and Related Communication Device
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CN111464271B (zh) * 2014-06-13 2023-06-30 苹果公司 用于改进的harq反馈指示的装置、设备及无线通信装置
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CN107347002A (zh) * 2016-05-06 2017-11-14 北京三星通信技术研究有限公司 一种harq-ack反馈信息的传输方法和设备
CN107347002B (zh) * 2016-05-06 2021-11-12 北京三星通信技术研究有限公司 一种harq-ack反馈信息的传输方法和设备
CN109863708A (zh) * 2016-10-21 2019-06-07 瑞典爱立信有限公司 针对未调度的上行链路的harq反馈
CN109863708B (zh) * 2016-10-21 2022-02-25 瑞典爱立信有限公司 针对未调度的上行链路的harq反馈的方法和装置
CN114071677A (zh) * 2017-03-24 2022-02-18 华为技术有限公司 一种指示信息的传输方法和装置
CN114071677B (zh) * 2017-03-24 2024-05-14 华为技术有限公司 一种指示信息的传输方法和装置

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