WO2011047506A1 - Procédé de détection à l'aveugle d'un canal de commande de liaison descendante physique (pdcch) et procédé et dispositif de planification de ressources - Google Patents

Procédé de détection à l'aveugle d'un canal de commande de liaison descendante physique (pdcch) et procédé et dispositif de planification de ressources Download PDF

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Publication number
WO2011047506A1
WO2011047506A1 PCT/CN2009/074533 CN2009074533W WO2011047506A1 WO 2011047506 A1 WO2011047506 A1 WO 2011047506A1 CN 2009074533 W CN2009074533 W CN 2009074533W WO 2011047506 A1 WO2011047506 A1 WO 2011047506A1
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Prior art keywords
dci
pdcch
terminal
crc
downlink control
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PCT/CN2009/074533
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English (en)
Chinese (zh)
Inventor
武雨春
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN200980149010.9A priority Critical patent/CN102246449B/zh
Priority to PCT/CN2009/074533 priority patent/WO2011047506A1/fr
Publication of WO2011047506A1 publication Critical patent/WO2011047506A1/fr

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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
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a blind detection method, a resource scheduling method, and a device for a physical layer downlink control channel PDCCH.
  • a plurality of MSs in a cell dynamically multiplex time-frequency resources, and the time-frequency resources occupied by an MS are PDCCHs (Physical Downlink Control Channels) corresponding to the MSs. Physical layer downlink control channel) to indicate.
  • the PDCCHs of all MSs are generally used in the first 1 ⁇ 3 OFDM (Orthogonal Frequency Division Multiplexing) symbols (Symbols) of one subframe (including 14 OFDM symbols in total and 1 ms in duration).
  • FIG. 1 is a diagram of relationship between PDCCH and PDSCH in one subframe in the prior art. As shown in FIG. 1, the MS can obtain data corresponding to the MS in the PDSCH according to the control information of the PDCCH.
  • the PDCCH information is formed by convolutional coding of the original DCI (Downlink Control Information).
  • the DCI format (format) contains the following: 1C, 0, 1A, 3, 3A, 1, IB, ID, 2, 2A. Each DCI format may end up with a different length.
  • the three OFDM symbols may include multiple CCEs (Control Channel Element, which is the smallest unit of resources occupied by the control channel, and one CCE corresponds to 36 resource elements RE), and each PDCCH has a length of 1, 2, There are 4 or 8 CCEs, so 3 OFDM Symbols may contain multiple PDCCHs, and each MS finds its own PDCCH in these 3 OFDM Symbols.
  • the search space where the PDCCH is located (that is, all possible options for PDCCH blind detection) is divided into two categories, namely CSS (Common Search Space) and DSS (MS-specific Search Space).
  • the PDCCH information contained in the CSS is common information for all MSs, and the DSS is a search space dedicated to an MS.
  • the information contained therein is valid only for one MS, and the information MS of both spaces needs to be detected.
  • Table 1 shows the PDCCH candidates that the MS needs to monitor.
  • the possible PDCCH length after encoding is the third column of Table 1 is the total number of CCEs of all possible PDCCHs after the PDCCH length is determined as the corresponding value of the second column; the fourth column of Table 1 is placed for each PDCCH. The number of possible locations. The relationship between the three is the product of the third column and the fourth column.
  • the PDCCH resources that each MS needs to listen to are also dynamically changed.
  • the MS of the prior art needs to perform blind detection up to 44 times (that is, the MS does not know whether there is any PDCCH signaling sent to itself before the detection, or knows that there is a transmission. If you do not know the format of the PDCCH, you need to detect all possible cases to obtain the PDCCH information corresponding to the MS, and then obtain the PDSCH corresponding to the MS and other information through the PDCCH information. Signaling information.
  • Table 2 shows the PDCCH blind detection classification and the required number of detection times.
  • PDCCH has up to 10 formats (different search spaces have different formats, even if there are multiple different formats in each search space), some of which have the same DCI original information length, such as format 0, 1A
  • the original information of 3, 3A is the same length.
  • These four formats can be detected by one Viterbi decoding. Some are different.
  • the MS needs to perform multiple Viterbi decoding to detect, and Viterbi translates.
  • the code is the most computationally intensive part of the blind detection.
  • the length after encoding is only 4 and 8 CCE.
  • AL is the number of corresponding CCEs after encoding. The larger the AL, the greater the probability that the PDCCH is detected, and the more reliable the communication. The MS needs to perform Viterbi decoding for detection according to these lengths.
  • the AL is not determined after the encoding, and the number of blind detections required is too large.
  • the MS needs 44 times of Viterbi decoding to complete the blind detection.
  • the current subframe does not have the resource scheduling of a certain MS, that is, when the BS does not send the PDCCH of the MS, since the MS does not know that the PDCCH is not sent to itself, it still needs to perform blind detection. At this time, since the PDCCH is not detected at all, the MS will always detect until the maximum number of blind detections is reached: 44 times, which wastes a lot of power for the MS.
  • the embodiment of the present invention provides a blind detection method, a resource scheduling method, and a device for a physical layer downlink control channel PDCCH.
  • the method in this embodiment is used to notify a corresponding terminal by using a special PDCCH: The resource scheduling information of the terminal; when the terminal detects the special PDCCH, the subsequent PDCCH blind detection will not be performed.
  • the embodiment of the present invention provides a blind detection method for a PDCCH of a physical layer downlink control channel, where the method includes: decoding a PDCCH according to a format of a DCI to be detected; and descrambling the decoded PDCCH by using a terminal identifier.
  • CRC cyclic redundancy check code
  • the embodiment of the present invention further provides a blind detection apparatus for a physical layer downlink control channel PDCCH, where the apparatus includes: a decoding unit, configured to decode a PDCCH according to a format of a DCI to be detected; a descrambling unit, The method is configured to perform descrambling on the decoded PDCCH by using the terminal identifier, to obtain downlink control information DCI including a cyclic redundancy check code CRC, and an analyzing unit, configured to parse the obtained DCI content when the CRC is correct And a judging unit, configured to stop the blind detection of the subsequent PDCCH when the content of the obtained DCI is a sequence in which the DCI to be detected does not appear.
  • a decoding unit configured to decode a PDCCH according to a format of a DCI to be detected
  • a descrambling unit The method is configured to perform descrambling on the decoded PDCCH by using the terminal identifier, to obtain downlink control information DCI including
  • the embodiment of the present invention provides a resource scheduling method, where the method includes: selecting downlink control information DCI of at least one format, and filling the content of the DCI by using a sequence in which the DCI does not occur; DCI performs cyclic redundancy check CRC processing; adopts target terminal The identifier is used to scramble the CRC processed information; the scrambled information is code modulated, and mapped to the PDCCH resource for transmission.
  • the embodiment of the present invention provides a resource scheduling apparatus, where the apparatus includes: a DCI forming unit, configured to select at least one format of downlink control information DCI, and fill the location by using a sequence in which the DCI does not occur. a content of the DCI; a CRC processing unit, configured to perform cyclic redundancy check CRC processing on the DCI; a scrambling unit, configured to perform scrambling on the CRC processed information by using an identifier of the target terminal; The scrambled information is code modulated and mapped onto the PDCCH resource for transmission.
  • the method of the embodiment of the present invention uses a special PDCCH to notify the corresponding terminal: there is no resource scheduling information corresponding to the terminal in the subframe; when the terminal detects the special PDCCH, the subsequent PDCCH blind detection.
  • This method can reduce the number of PDCCH blind detections for those MSs that are not scheduled, thereby reducing the power consumption of the MS.
  • FIG. 1 is a diagram showing relationship between a PDCCH and a PDSCH in one subframe in the prior art
  • FIG. 3 is a functional block diagram of a device according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic diagram of an actual working principle of a device according to Embodiment 1 of the present invention.
  • Figure 5 is a flowchart of a method according to Embodiment 2 of the present invention.
  • Figure 6 is a functional block diagram of a device according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic diagram of an actual working principle of a device according to Embodiment 2 of the present invention.
  • Embodiment 1 This embodiment provides a resource scheduling method and apparatus.
  • the resource scheduling method and apparatus of this embodiment design a special PDCCH channel format compatible with each PDCCH, which is called a Blank PDCCH. If there is no resource scheduling for a certain MS in the current subframe, the Blank PDCCH is used to indicate that the current subframe has no resource scheduling for the MS. Once the MS detects the Blank PDCCH, the subsequent PDCCH blind detection is immediately stopped.
  • the Blank PDCCH may be sent on the PDCCH resources, and the Blank PDCCH is preferentially sent to the MSs with less remaining power. Reduce the power consumption of these MSs.
  • the PDCCH and PDSCH resources may have a margin at this time, and the idle PDCCH resources may be used to send Blank PDCCH to some MSs, thereby reducing the power consumption of these MSs.
  • the Blank PDCCH can be distinguished from other normal PDCCHs, so that the MS detects that the PDCCH does not have its own resource scheduling and stops the subsequent PDCCH blind detection.
  • Figure 2 is a flow chart of the method of the present embodiment. As shown in FIG. 2, the method in this embodiment includes:
  • S20K selects at least one format of downlink control information DCI, and fills the content of the DCI by using a sequence that is impossible for the DCI;
  • the method in this embodiment uses the original 10 DCI formats, but replaces the specific content of the selected DCI with a sequence that is unlikely to occur in the DCI, such as an all-zero sequence.
  • the value of the sequence can also be agreed with the terminal in advance to facilitate terminal identification.
  • sequences may appear in the content of the DCI, but some sequences (such as the full 0 sequence) is not in the DCI, so the sequence that does not appear is the sequence that the DCI is unlikely to appear.
  • a DCI format may be selected for different MSs respectively; or a common DCI format may be selected for all MSs; or more than one DCI may be selected for an MS to increase the detection of the BS by the MS.
  • the probability of the PDCCH further reduces the power consumption of the MS. The specific design is carried out according to actual needs.
  • the first step is to determine the terminal without resource scheduling, and the Blank PDCCH corresponds to the selected target terminals.
  • the target terminal in this embodiment may be a terminal with low remaining power or a terminal with low power consumption requirement.
  • the purpose of scrambling is to enable each MS to distinguish whether the currently detected normal PDCCH or Blank PDCCH is the PDCCH sent to itself. For example, after receiving the PDCCH sent to UE2, UE1 descrambles with the identifier of UE1, and cannot pass the CRC detection.
  • the target terminal identifier of the embodiment is an RNTI (Radio Network Temporary Identifier).
  • S204 Perform coding and modulation on the scrambled information, and then map and transmit to the PDCCH resource.
  • the Blank PDCCH is mapped to the unused PDCCH space.
  • the so-called mapping is to place the coded PDCCH on some CCEs of the first 1-3 OFDM symbols of the subframe.
  • FIG. 3 is a functional block diagram of a device in this embodiment.
  • the device can implement the resource scheduling method in this embodiment.
  • the device in this embodiment may be a base station device.
  • the apparatus 30 includes: a DCI forming unit 301, configured to select downlink control information DCI of at least one format, and fill the content of the DCI by using a sequence in which the DCI is unlikely to occur; the CRC processing unit 302, Performing CRC processing on the DCI; the scrambling unit 303 is configured to use the identifier of the target terminal to the CRC The received information is scrambled.
  • the transmitting unit 304 is configured to perform coding and modulation on the scrambled information, and then map to the PDCCH resource for transmission.
  • the apparatus 30 of this embodiment further includes: a terminal selection unit (not shown), configured to select a terminal with low remaining power or a terminal with low power consumption requirement as the target terminal.
  • FIG. 4 is a schematic diagram of an actual working principle of the device of the embodiment.
  • any one of the existing DCI formats for example, DCI 1A, in which the UE needs to detect whether there is DCI 1A in any transmission mode
  • each domain in the original DCI is set as the original DCI.
  • Specific sequences that do not appear for example, all 0 sequences
  • ⁇ Specific sequences that do not appear
  • CRC scrambling, encoding, rate matching process
  • the processed information is used as Blank
  • the PDCCH modulation is mapped onto the PDCCH resource for transmission.
  • the resource scheduling method and apparatus in this embodiment uses a special PDCCH to notify the corresponding terminal: there is no resource scheduling information corresponding to the terminal in the subframe; when the terminal detects the special PDCCH, the terminal does not Subsequent PDCCH blind detection is performed.
  • This method can reduce the number of PDCCH blind detections and reduce the power consumption of the MS for those MSs that are not scheduled. Therefore, the method and apparatus of this embodiment can achieve better resource scheduling.
  • Embodiment 2 This embodiment provides a blind detection method and apparatus.
  • the blind detection method and apparatus of this embodiment are used in conjunction with the resource scheduling method and apparatus of Embodiment 1, and the blind detection is optimized.
  • the apparatus of this embodiment may be a terminal device.
  • Figure 5 is a flow chart of the method of the present embodiment. As shown in FIG. 5, the method in this embodiment includes:
  • S50K decodes the PDCCH according to the format of the DCI to be detected
  • the MS side detects different PDCCHs in different DCI formats in different transmission modes, and uses different decoding modes for different DCI formats.
  • the terminal identifier uses the terminal identifier to descramble the decoded PDCCH, and obtain downlink control information DCI including a cyclic redundancy check code CRC; If the base station side uses the terminal identifier to perform scrambling, the terminal side uses the same terminal identifier to perform descrambling. If the descrambling succeeds, the PDCCH is a PDCCH corresponding to the terminal itself.
  • the terminal identifier is an RNTI.
  • the sequence is a sequence in which the DCI to be detected is unlikely to be displayed. At this time, it indicates that there is no scheduling information corresponding to the MS in the subframe, and the MS does not need to perform subsequent detection on other PDCCHs. On the contrary, it is necessary to parse out the values of various parameters in the DCI and continue to detect other possible PDCCHs.
  • FIG. 6 is a functional block diagram of the device in the embodiment.
  • the device can implement the blind detection method in this embodiment.
  • the device in this embodiment can be a terminal device.
  • the apparatus includes: a decoding unit 601, configured to decode a PDCCH according to a format of a DCI to be detected; and a descrambling unit 602, configured to perform descrambling on the decoded PDCCH by using a terminal identifier, to obtain The downlink control information DCI of the cyclic redundancy check code CRC is included; the parsing unit 603 is configured to parse the content of the obtained DCI when the CRC is correct; and the determining unit 604 is configured to: when the content of the obtained DCI is the DCI to be detected When the sequence is unlikely to occur, the blind detection of the subsequent PDCCH is stopped.
  • a decoding unit 601 configured to decode a PDCCH according to a format of a DCI to be detected
  • a descrambling unit 602 configured
  • FIG. 7 is a schematic diagram of an actual working principle of the device of the embodiment. As shown in Figure 7: After the demapping, demodulation, and rate matching are performed on the receiving end of the MS, the Viterbi decoding is performed according to the DCI format to be tested. If the CRC is correct after descrambling, the DCI obtained by the analysis is further analyzed. If the obtained DCI content is a sequence in which the DCI to be tested does not appear (for example, all 0s), it is determined as a Blank PDCCH, and the subsequent PDCCH detection of the subframe is stopped; otherwise, each domain is parsed according to the DCI format to be tested, and Continue to detect other possible PDCCHs.
  • the method and the device in this embodiment by detecting the Blank PDCCH, know that the subframe does not include the scheduling information corresponding to the MS, and once the Blank PDCCH is detected, the subsequent PDCCH blind detection of the subframe is stopped.
  • the method and device do not need to increase the number of decodings for blind detection, only After the decoding is completed and the CRC is correct, adding an operation to determine whether the DCI content is a sequence in which the DCI to be tested does not appear (for example, a full 0 sequence) has little effect on the blind detection of the original system, but can greatly reduce the work of the MS. Consumption.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

Le mode de réalisation de la présente invention concerne un procédé de détection à l'aveugle d'un PDCCH, ainsi qu'un procédé et un dispositif de planification de ressources. Ledit procédé de détection à l'aveugle d'un PDCCH consiste : à décoder le PDCCH en fonction du format des informations de commande de liaison descendante (DCI) à détecter; à réaliser une opération de désembrouillage sur le PDCCH décodé avec l'identificateur de terminal afin d'obtenir les DCI comprenant un contrôle par redondance cyclique (CRC); à analyser le contenu des DCI obtenues si le CRC est correct; et à stopper toute future détection à l'aveugle du PDCCH si le contenu des DCI obtenues est une séquence qui ne devrait pas apparaître dans les DCI à détecter. Le procédé et le dispositif conformes au mode de réalisation de la présente invention permettent de réduire le temps de détection à l'aveugle du PDCCH dans la station mobile (MS) non planifiée pour le rendre optimal, et donc de réduire la consommation d'énergie de la MS.
PCT/CN2009/074533 2009-10-20 2009-10-20 Procédé de détection à l'aveugle d'un canal de commande de liaison descendante physique (pdcch) et procédé et dispositif de planification de ressources WO2011047506A1 (fr)

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CN200980149010.9A CN102246449B (zh) 2009-10-20 2009-10-20 Pdcch的盲检测方法、资源调度方法与装置
PCT/CN2009/074533 WO2011047506A1 (fr) 2009-10-20 2009-10-20 Procédé de détection à l'aveugle d'un canal de commande de liaison descendante physique (pdcch) et procédé et dispositif de planification de ressources

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WO2012159368A1 (fr) * 2011-08-05 2012-11-29 华为技术有限公司 Procédé et dispositif de détection à l'aveugle
CN103139844A (zh) * 2011-11-22 2013-06-05 华为技术有限公司 控制信息的解析方法及终端
CN106332242A (zh) * 2015-06-30 2017-01-11 展讯通信（上海）有限公司 降低lte网络下ue侧功耗的方法和装置
CN106817771A (zh) * 2015-11-27 2017-06-09 大唐移动通信设备有限公司 一种pdcch漏检的处理方法及装置
CN108418657A (zh) * 2018-02-07 2018-08-17 广州慧睿思通信息科技有限公司 一种lte系统中dci格式和传输模式的判定方法
CN109673056A (zh) * 2019-03-11 2019-04-23 重庆邮电大学 5g系统中基于功率测量的pdcch自适应盲检测方法
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WO2020042170A1 (fr) * 2018-08-31 2020-03-05 北京小米移动软件有限公司 Procédé auxiliaire et appareil permettant de détecter un canal de commande de liaison descendante physique
CN110881217A (zh) * 2018-09-05 2020-03-13 上海朗帛通信技术有限公司 一种被用于无线通信的用户设备、基站中的方法和装置
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WO2012159368A1 (fr) * 2011-08-05 2012-11-29 华为技术有限公司 Procédé et dispositif de détection à l'aveugle
CN103139844A (zh) * 2011-11-22 2013-06-05 华为技术有限公司 控制信息的解析方法及终端
CN103139844B (zh) * 2011-11-22 2016-09-14 华为技术有限公司 控制信息的解析方法及终端
CN106332242A (zh) * 2015-06-30 2017-01-11 展讯通信（上海）有限公司 降低lte网络下ue侧功耗的方法和装置
CN106817771A (zh) * 2015-11-27 2017-06-09 大唐移动通信设备有限公司 一种pdcch漏检的处理方法及装置
US11997041B2 (en) 2017-02-13 2024-05-28 At&T Intellectual Property I, L.P. Early termination scheme for blind decoding of a downlink control channel
US10326578B2 (en) 2017-02-13 2019-06-18 At&T Intellectual Property I, L.P. Early termination scheme for blind decoding of a downlink control channel
US10728004B2 (en) 2017-02-13 2020-07-28 At&T Intellectual Property I, L.P. Early termination scheme for blind decoding of a downlink control channel
CN114828179A (zh) * 2017-06-20 2022-07-29 北京小米移动软件有限公司 一种调度信令的检测方法及装置
CN114828179B (zh) * 2017-06-20 2024-03-01 北京小米移动软件有限公司 一种调度信令的检测方法及装置
CN108418657A (zh) * 2018-02-07 2018-08-17 广州慧睿思通信息科技有限公司 一种lte系统中dci格式和传输模式的判定方法
CN108418657B (zh) * 2018-02-07 2021-06-04 广州慧睿思通信息科技有限公司 一种lte系统中dci格式和传输模式的判定方法
WO2020042170A1 (fr) * 2018-08-31 2020-03-05 北京小米移动软件有限公司 Procédé auxiliaire et appareil permettant de détecter un canal de commande de liaison descendante physique
CN110881217B (zh) * 2018-09-05 2022-10-18 上海朗帛通信技术有限公司 一种被用于无线通信的用户设备、基站中的方法和装置
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CN110881217A (zh) * 2018-09-05 2020-03-13 上海朗帛通信技术有限公司 一种被用于无线通信的用户设备、基站中的方法和装置
CN109673056B (zh) * 2019-03-11 2022-04-05 重庆邮电大学 5g系统中基于功率测量的pdcch自适应盲检测方法
CN109673056A (zh) * 2019-03-11 2019-04-23 重庆邮电大学 5g系统中基于功率测量的pdcch自适应盲检测方法

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