WO2013099268A1 - Procédé de décodage d'un indicateur de commande d'un canal de commande et équipement d'utilisateur - Google Patents

Procédé de décodage d'un indicateur de commande d'un canal de commande et équipement d'utilisateur Download PDF

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WO2013099268A1
WO2013099268A1 PCT/JP2012/008399 JP2012008399W WO2013099268A1 WO 2013099268 A1 WO2013099268 A1 WO 2013099268A1 JP 2012008399 W JP2012008399 W JP 2012008399W WO 2013099268 A1 WO2013099268 A1 WO 2013099268A1
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search space
decoding
subset
candidate set
control indicator
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PCT/JP2012/008399
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English (en)
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Zeng YANG
Lei Huang
Ming Ding
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Sharp Kabushiki Kaisha
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    • 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 signaling, i.e. of overhead other than pilot signals

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  • the present invention relates to the field of communication technology, and more particularly, to a method for decoding a control indicator of a control channel and a User Equipment (UE).
  • UE User Equipment
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • UE User Equipment
  • scheduling assignment instructions are typically carried by a Physical Downlink Control Channel (PDCCH) and include downlink scheduling grant (DL_grant) corresponding to Physical Downlink Shared Channel (PDSCH) and uplink scheduling grant (UL_grant) corresponding to Physical Uplink Shared Channel (PUSCH), for example.
  • the specific formats of the scheduling assignment instructions are referred to as Downlink Control Indicators (DCIs).
  • the DCIs include transmission-mode-dependent DCI formats (such as DCI Formats 1/1B/1D/2/2A/2B/2C/4) and transmission-mode- independent DCI formats (such as DCI Formats 1C/3/3A).
  • the 3GPP E-UTRA system is also referred to as Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the PDCCH and the PDSCH are time division multiplexed (TDM) together and the PDCCH is demodulated based on a cell specific Common Reference Signal (CRS).
  • CRS Common Reference Signal
  • the UE For each transmission mode configured for a UE, the UE needs to detect (blindly) in the PDCCH two DCIs: a DCI format corresponding to the configured transmission mode and a transmission-mode-independent DCI format (DCI Format 0/1A).
  • DCI Format 0/1A transmission-mode-independent DCI format
  • a base station transmits a scheduling assignment instruction using a transmission-mode-dependent DCI format.
  • the base station uses the transmission-mode-independent DCI formats 0/1A (indicating UL_grant and DL_grant, respectively). Since the lengths of the DCI Formats 0/1A are relatively smaller, it is possible to provide the UE with a robust control channel connection, in combination with an aggregation level mechanism of PDCCH, when the channel condition of the UE degrades. Furthermore, since the DCI Formats 0/1A are independent of transmission mode, i.e., they will be detected by any UE regardless of its transmission mode, any mismatching between the UE and the base station can be avoided when the transmission mode is changed.
  • the LTE system supports bandwidths variable from 1.4 MHz (6 Resource Blocks (RBs)) to 20 MHz (100 RBs).
  • RBs Resource Blocks
  • the physical layer PDCCH occupies resources in both time domain and frequency domain.
  • the time-frequency resources allocated by the system to the PDCCH are also variable.
  • the PDCCH occupies all available sub-carrier resources in the frequency domain.
  • the system flexibly configures the time domain resources (i.e., the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols) occupied by the PDCCH using a Control Format Indicator (CFI) value in a Physical Control Format Indicator Channel (PCFICH).
  • CFI Control Format Indicator
  • PCFICH Physical Control Format Indicator Channel
  • the time-frequency resources (i.e., the sub-carrier resources and the number of OFDM symbols) allocated to the PDCCH can be divided into a number of Control Channel Elements (CCEs).
  • CCEs Control Channel Elements
  • the system can select an appropriate aggregation level (different aggregation levels corresponds to different coding rates) for transmission of the PDCCH for the UE.
  • the physical layer PDCCHs for all UEs share every transmission time unit.
  • Each UE detects (blindly) any of possible transmission formats for the PDCCH in a given search space using its unique scrambling code, so as to detect various possible lengths of control channel information, aggregation levels and positions of the occupied time-frequency resources (CCEs), and the like.
  • CCEs time-frequency resources
  • the transmission mode used by the UE in a time period is defined and the search space is planned.
  • the transmission mode which the UE possibly uses in a time period can be semi-statically notified to the UE via dedicated signaling.
  • two DCI formats need to be detected for each transmission mode.
  • a UE specific DCI format is detected by means of blind detection in a UE specific search space.
  • the UE specific search space includes logical time-frequency resources composed of CCEs. In this UE specific search space, the UE receives a UE specific control channel and performs a blind detection.
  • the UE specific search space is a specific search space in which only particular UEs need to blindly detect PDCCH.
  • the UE specific search space includes a number of CCEs.
  • there are four possible aggregation levels of decoding candidates in the UE specific search space in which 1, 2, 4 and 8 CCEs are used, respectively.
  • the four aggregation levels in which 1, 2, 4 and 8 CCEs are used correspond to 6, 6, 2 and 2 decoding candidates, respectively.
  • There are two possible aggregation levels of decoding candidates in the common search space in which 4 and 8 CCEs are used, respectively.
  • the two aggregation levels in which 4 and 8 CCEs are used correspond to 4 and 2 decoding candidates, respectively.
  • the PDCCH used for scheduling instruction may be mapped and transmitted in a particular CCE aggregation level in the UE specific search space and/or the common search space. Then, the UE needs to receive and blindly detect it in the UE specific search space and/or the common search space in which the PDCCH may be mapped and transmitted. If the PDCCH signaling data detected by the UE is verified by a Cyclic Redundancy Check (CRC), it is indicated that the detected PDCCH is transmitted by the system for the UE.
  • CRC Cyclic Redundancy Check
  • the UE can parse the PDCCH in accordance with the DCI formats defined in the specifications to determine the positions of time-frequency resources for the UE to receive or transmit data channel. Then, the UE completes the data transmission and reception. In this way, the communication between the UE and the system can be achieved.
  • An enhanced PDCCH (ePDCCH) will be introduced in the LTE Rel-11 system.
  • the ePDCCH will be frequency division multiplexed (FDM) with PDSCH in the PDSCH region defined by LTE Rel-10 and its earlier versions.
  • the ePDCCH will be demodulated based on a UE specific Demodulation Reference Signal (DMRS).
  • DMRS Demodulation Reference Signal
  • the distributed transmission mode allows diversity gains and is suitable for transmitting critical control information and providing a UE with robust control channel connection when its channel condition degrades.
  • These two transmission modes may use same or different physical RB resources.
  • the specific definition of search space has not been standardized currently.
  • DCI Formats 0/1A are currently designed such that Format 0 and Format 1A have the same size to reduce the number of blind detections by the UE, it is not possible to place DCI Format 1A in the distributed search space which placing DCI Format 0 in the localized search space; otherwise the number of control channel blind detections by the UE, and thus the complexity and power consumption of the UE, will be increased.
  • the allocation of ePDCCH search space for a UE may vary over time. If a parameter of the ePDCCH search space changes, there will be a period of time during which the UE and the base station may be uncertain about such configuration parameter as the ePDCCH search space being used. Such uncertainty may lead to misunderstanding without proper solution.
  • a method for decoding a control indicator of a control channel includes: detecting, in a first search space, a first subset of a decoding candidate set, the decoding candidate set containing decoding candidates for decoding the control indicator; detecting, in a second search space, a second subset of the decoding candidate set, the second search space being different from the first search space; and decoding the control indicator based on the first subset and the second subset of the decoding candidate set.
  • control indicator is a Downlink Control Indicator (DCI).
  • DCI Downlink Control Indicator
  • the first search space is a localized User Equipment (UE) specific enhanced Physical Downlink Control Channel (ePDCCH) search space.
  • UE User Equipment
  • ePDCCH enhanced Physical Downlink Control Channel
  • the second search space is one of: a distributed UE specific Physical Downlink Control Channel (PDCCH) search space, a distributed common PDCCH search space, a distributed common ePDCCH search space and a distributed UE specific ePDCCH search space.
  • PDCH Physical Downlink Control Channel
  • the method further includes: detecting, in the first search space, a first subset of an aggregation level candidate set, the aggregation level candidate set containing possible aggregation level for the control channel; and detecting, in the second search space, a second subset of the aggregation level candidate set.
  • the first subset of the aggregation level candidate set corresponds to the first subset of the decoding candidate set and the second subset of the aggregation level candidate set corresponds to the second subset of the decoding candidate set.
  • a User Equipment includes: a decoding candidate detecting unit configured to detect in a first search space a first subset of a decoding candidate set for a control indicator of a control channel and to detect in a second search space a second subset of the decoding candidate set, the decoding candidate set containing decoding candidates for decoding the control indicator, the second search space being different from the first search space; and a decoding unit configured to decode the control indicator based on the first subset and the second subset of the decoding candidate set.
  • control indicator is a Downlink Control Indicator (DCI).
  • DCI Downlink Control Indicator
  • the first search space is a localized UE specific enhanced Physical Downlink Control Channel (ePDCCH) search space.
  • ePDCCH enhanced Physical Downlink Control Channel
  • the second search space is one of: a distributed UE specific Physical Downlink Control Channel (PDCCH) search space, a distributed common PDCCH search space, a distributed common ePDCCH search space and a distributed UE specific ePDCCH search space.
  • PDCH Physical Downlink Control Channel
  • the UE further includes: an aggregation level detecting unit configured to detect in the first search space a first subset of an aggregation level candidate set and to detect in the second search space a second subset of the aggregation level candidate set, the aggregation level candidate set containing possible aggregation level for the control channel.
  • the first subset of the aggregation level candidate set corresponds to the first subset of the decoding candidate set and the second subset of the aggregation level candidate set corresponds to the second subset of the decoding candidate set.
  • a method for decoding a control indicator of a control channel includes: detecting, in a first search space, only decoding candidates of a transmission-mode-independent control indicator; detecting, in a second search space, decoding candidates of the control indicator again, the second search space being different from the first search space; and decoding the control indicator based on the decoding candidates detected in the first search space and the decoding candidates detected in the second search space.
  • control indicator is Downlink Control Indicator (DCI) Format 0/1A.
  • DCI Downlink Control Indicator
  • a User Equipment includes: a decoding candidate detecting unit configured to detect, in a first search space, only decoding candidates of a transmission-mode-independent control indicator of a control channel and to detect, in a second search space, decoding candidates of the control indicator again, the second search space being different from the first search space; and a decoding unit configured to decode the control indicator based on the decoding candidates detected in the first search space and the decoding candidates detected in the second search space.
  • control indicator is Downlink Control Indicator (DCI) Format 0/1A.
  • DCI Downlink Control Indicator
  • Fig. 1 shows a block diagram of a UE according to the present invention.
  • Figs. 2a is a schematic diagram showing search spaces according to embodiments of the present invention.
  • Figs. 2b is a schematic diagram showing search spaces according to embodiments of the present invention.
  • Figs. 2c is a schematic diagram showing search spaces according to embodiments of the present invention.
  • Figs. 2d is a schematic diagram showing search spaces according to embodiments of the present invention.
  • Fig. 3 is a flowchart illustrating a method for decoding a control indicator of a control channel according to the present invention.
  • FIG. 4 is a flowchart illustrating another method for decoding a control indicator of a control channel according to the present invention.
  • Figs. 5a is a schematic diagram showing search spaces according to the decoding method of Fig. 4.
  • Figs. 5b is a schematic diagram showing search spaces according to the decoding method of Fig. 4.
  • Figs. 5c is a schematic diagram showing search spaces according to the decoding method of Fig. 4.
  • the present invention is not limited to the LTE-Advanced system, but is also applicable to other systems such as Wideband Code Division Multiple Access (WCDMA) system and LTE system.
  • WCDMA Wideband Code Division Multiple Access
  • a search space composed of CCEs is provided for detecting a control channel.
  • a UE receives and detects the control channel in the search space.
  • a decoding candidate in the search space for the control channel (e.g., PDCCH or ePDCCH) may have one of a plurality of possible aggregation levels.
  • a decoding candidate in the UE specific search space may have one of four possible aggregation levels in which 1, 2, 4 and 8 CCEs are occupied, respectively (hereinafter referred to as aggregation levels 1, 2, 4 and 8, respectively).
  • the set of these possible aggregation levels is referred to here as "aggregation level candidate set”.
  • each possible aggregation level in the aggregation level candidate set the UE detects the decoding candidate to determine the aggregation level of the decoding candidate in the control channel.
  • each possible aggregation level corresponds to one or more possible decoding candidates (e.g., as mentioned above, in the UE specific search space, four aggregation levels in which 1, 2, 4 and 8 CCEs are used correspond to 6, 6, 2 and 2 decoding candidates, respectively).
  • the set of these possible decoding candidates is referred to here as "decoding candidate set”.
  • the UE decodes each decoding candidate in the decoding candidate set to determine the control indicator.
  • Fig. 1 shows a block diagram of a UE 100 according to the present invention.
  • the UE 100 includes a decoding candidate detecting unit 110 and a decoding unit 120. It should be understood by those skilled in the art that the UE 100 also includes other functional units necessary for its functions, such as transceiver, processor and memory.
  • the decoding candidate detecting unit 110 is configured to detect in a first search space a first subset of a decoding candidate set for a control indicator of a control channel and to detect in a second search space a second subset of the decoding candidate set.
  • the decoding candidate set contains decoding candidates for decoding the control indicator.
  • the second search space is different from the first search space.
  • the decoding unit 120 is configured to decode the control indicator based on the first subset and the second subset of the decoding candidate set. As noted above, the decoding unit 120 performs Cyclic Redundancy Check (CRC) on the decoding candidates and determines the decoding candidate verified by the CRC as the decoding result of the control indicator.
  • CRC Cyclic Redundancy Check
  • control channel can be PDCCH or ePDCCH and the control indicator can be DCI.
  • DCI in PDCCH and ePDCCH is used.
  • present invention being applied to the LTE-A system is an example only. The present invention can be applied to other control channels and their associated control indicators in other systems.
  • the decoding candidates correspond to aggregation levels.
  • the UE 100 can further include an aggregation level detecting unit (not shown) configured to detect in the first search space a first subset of an aggregation level candidate set and to detect in the second search space a second subset of the aggregation level candidate set.
  • the aggregation level candidate set contains possible aggregation level for the control channel.
  • the first subset of the aggregation level candidate set corresponds to the first subset of the decoding candidate set and the second subset of the aggregation level candidate set corresponds to the second subset of the decoding candidate set.
  • the decoding candidates can be distributed as follows.
  • a decoding candidate having an odd start address can be detected in the first search space and a decoding candidate having an even start address can be blindly detected in the second search space.
  • the method for obtaining ePDCCH decoding candidates in the LTE Rel-11 is the same as the method for obtaining PDCCH decoding candidates in the LTE Rel-10.
  • Figs. 2a-2d are schematic diagrams showing search spaces according to embodiments of the present invention.
  • the abscissa represents frequency and the ordinate represents time slot;
  • the upper portion represents PDCCH control region according to Rel-10 (composed of CCEs) and the lower portion represents a region shared by data region PDSCH and ePDCCH control region according to Rel-11 (composed of CCEs).
  • the base station schedules UL_grant/DL_grant in DCI Formats 0/1A, e.g., when the channel condition of the UE degrades or the base station reconfigures the transmission mode of the UE.
  • the control channel search space for the UE can be divided into two parts: a localized UE specific ePDCCH search space (i.e., the first search space) and a distributed (LTE Rel-10) UE specific PDCCH search space (i.e., the second search space).
  • the decoding candidate detecting unit 110 detects a first subset of the decoding candidate set for the DCI Formats 0/1A in the localized UE specific ePDCCH search space and detects a second subset of the decoding candidate set in the distributed UE specific PDCCH search space.
  • the aggregation level detecting unit can detect the possible aggregation levels 1 and 2 for the DCI Formats 0/1A in the localized UE specific ePDCCH search space.
  • the aggregation levels 1 and 2 correspond to 1 CCE (corresponding to 6 decoding candidates) and 2 CCEs (corresponding to 6 decoding candidates), respectively.
  • the decoding candidate detecting unit 110 can detect 6 decoding candidates corresponding to the aggregation level 1 (1 CCE) and 6 decoding candidates corresponding to the aggregation level 2 (2 CCEs) in the localized UE specific ePDCCH search space.
  • the first subset of the aggregation level candidate set contains the aggregation levels 1 and 2 and the first set of the decoding candidate set contains 12 decoding candidates corresponding to the aggregation levels 1 and 2.
  • the UE detects possible aggregation levels 4 and 8 for the DCI Formats 0/1A in the distributed UE specific PDDCH search space.
  • the aggregation levels 4 and 8 correspond to 4 CCEs (corresponding to 2 decoding candidates) and 8 CCEs (corresponding to 2 decoding candidates), respectively.
  • the decoding candidate detecting unit 110 can detect 2 decoding candidates corresponding to the aggregation level 4 (4 CCEs) and 2 decoding candidates corresponding to the aggregation level 8 (8 CCEs) in the distributed UE specific PDCCH search space.
  • the second subset of the aggregation level candidate set contains the aggregation levels 4 and 8 and the second set of the decoding candidate set contains 4 decoding candidates corresponding to the aggregation levels 4 and 8.
  • the DCI Formats 0/1A can obtain various gains from ePDCCH beamforming, while the robust control channel connection can be guaranteed by using the distributed UE specific PDCCH search space. Meanwhile, the number of blind detections is not increased.
  • the base station schedules UL_grant/DL_grant in DCI Formats 0/1A, e.g., when the channel condition of the UE degrades or the base station reconfigures the transmission mode of the UE.
  • the control channel search space for the UE can be divided into two parts: a localized UE specific ePDCCH search space and a distributed (LTE Rel-10) common PDCCH search space.
  • the decoding candidate detecting unit 110 detects a first subset of the decoding candidate set for the DCI Formats 0/1A in the localized UE specific ePDCCH search space and detects a second subset of the decoding candidate set in the distributed common PDCCH search space.
  • the aggregation level detecting unit can detect the possible aggregation levels 1 and 2 for the DCI Formats 0/1A in the localized UE specific ePDCCH search space.
  • the aggregation levels 1 and 2 correspond to 1 CCE (corresponding to 6 decoding candidates) and 2 CCEs (corresponding to 6 decoding candidates), respectively.
  • the decoding candidate detecting unit 110 can detect 6 decoding candidates corresponding to the aggregation level 1 (1 CCE) and 6 decoding candidates corresponding to the aggregation level 2 (2 CCEs) in the localized UE specific ePDCCH search space.
  • the first subset of the aggregation level candidate set contains the aggregation levels 1 and 2 and the first set of the decoding candidate set contains 12 decoding candidates corresponding to the aggregation levels 1 and 2.
  • the UE detects possible aggregation levels 4 and 8 for the DCI Formats 0/1A in the distributed common PDDCH search space.
  • the aggregation levels 4 and 8 correspond to 4 CCEs (corresponding to 4 decoding candidates) and 8 CCEs (corresponding to 2 decoding candidates), respectively.
  • the decoding candidate detecting unit 110 can detect 4 decoding candidates corresponding to the aggregation level 4 (4 CCEs) and 2 decoding candidates corresponding to the aggregation level 8 (8 CCEs) in the distributed common PDCCH search space.
  • the second subset of the aggregation level candidate set contains the aggregation levels 4 and 8 and the second set of the decoding candidate set contains 6 decoding candidates corresponding to the aggregation levels 4 and 8.
  • the base station schedules UL_grant/DL_grant in DCI Formats 0/1A, e.g., when the channel condition of the UE degrades or the base station reconfigures the transmission mode of the UE.
  • the control channel search space for the UE can be divided into two parts: a localized UE specific ePDCCH search space and a distributed common ePDCCH search space.
  • the decoding candidate detecting unit 110 detects a first subset of the decoding candidate set for the DCI Formats 0/1A in the localized UE specific ePDCCH search space and detects a second subset of the decoding candidate set in the distributed common ePDCCH search space.
  • the aggregation level detecting unit can detect the possible aggregation levels 1 and 2 for the DCI Formats 0/1A in the localized UE specific ePDCCH search space.
  • the aggregation levels 1 and 2 correspond to 1 CCE (corresponding to 6 decoding candidates) and 2 CCEs (corresponding to 6 decoding candidates), respectively.
  • the decoding candidate detecting unit 110 can detect 6 decoding candidates corresponding to the aggregation level 1 (1 CCE) and 6 decoding candidates corresponding to the aggregation level 2 (2 CCEs) in the localized UE specific ePDCCH search space.
  • the first subset of the aggregation level candidate set contains the aggregation levels 1 and 2 and the first set of the decoding candidate set contains 12 decoding candidates corresponding to the aggregation levels 1 and 2.
  • the UE detects possible aggregation levels 4 and 8 for the DCI Formats 0/1A in the distributed common ePDDCH search space.
  • the aggregation levels 4 and 8 correspond to 4 CCEs (corresponding to 4 decoding candidates) and 8 CCEs (corresponding to 2 decoding candidates), respectively.
  • the decoding candidate detecting unit 110 can detect 4 decoding candidates corresponding to the aggregation level 4 (4 CCEs) and 2 decoding candidates corresponding to the aggregation level 8 (8 CCEs) in the distributed common ePDCCH search space.
  • the second subset of the aggregation level candidate set contains the aggregation levels 4 and 8 and the second set of the decoding candidate set contains 6 decoding candidates corresponding to the aggregation levels 4 and 8.
  • the DCI Formats 0/1A can obtain various gains from ePDCCH beamforming, while the robust control channel connection can be guaranteed by using the distributed common ePDCCH search space. Meanwhile, the number of blind detections is not increased.
  • the base station schedules UL_grant/DL_grant in DCI Formats 0/1A, e.g., when the channel condition of the UE degrades or the base station reconfigures the transmission mode of the UE.
  • the control channel search space for the UE can be divided into two parts: a localized UE specific ePDCCH search space and a distributed UE specific ePDCCH search space.
  • the decoding candidate detecting unit 110 detects a first subset of the decoding candidate set for the DCI Formats 0/1A in the localized UE specific ePDCCH search space and detects a second subset of the decoding candidate set in the distributed UE specific ePDCCH search space.
  • the aggregation level detecting unit can detect the possible aggregation levels 1 and 2 for the DCI Formats 0/1A in the localized UE specific ePDCCH search space.
  • the aggregation levels 1 and 2 correspond to 1 CCE (corresponding to 6 decoding candidates) and 2 CCEs (corresponding to 6 decoding candidates), respectively.
  • the decoding candidate detecting unit 110 can detect 6 decoding candidates corresponding to the aggregation level 1 (1 CCE) and 6 decoding candidates corresponding to the aggregation level 2 (2 CCEs) in the localized UE specific ePDCCH search space.
  • the first subset of the aggregation level candidate set contains the aggregation levels 1 and 2 and the first set of the decoding candidate set contains 12 decoding candidates corresponding to the aggregation levels 1 and 2.
  • the UE detects possible aggregation levels 4 and 8 for the DCI Formats 0/1A in the distributed UE specific ePDDCH search space.
  • the aggregation levels 4 and 8 correspond to 4 CCEs (corresponding to 2 decoding candidates) and 8 CCEs (corresponding to 2 decoding candidates), respectively.
  • the decoding candidate detecting unit 110 can detect 2 decoding candidates corresponding to the aggregation level 4 (4 CCEs) and 2 decoding candidates corresponding to the aggregation level 8 (8 CCEs) in the distributed UE specific ePDCCH search space.
  • the second subset of the aggregation level candidate set contains the aggregation levels 4 and 8 and the second set of the decoding candidate set contains 4 decoding candidates corresponding to the aggregation levels 4 and 8.
  • the DCI Formats 0/1A can obtain various gains from ePDCCH beamforming, while the robust control channel connection can be guaranteed by using the distributed UE specific ePDCCH search space. Meanwhile, the number of blind detections is not increased.
  • Fig. 3 is a flowchart illustrating a method 300 for decoding a control indicator of a control channel according to the present invention.
  • the method 300 can be performed by the above UE 100.
  • the decoding candidate detecting unit 110 detects, in a first search space, a first subset of a decoding candidate set.
  • the decoding candidate set contains decoding candidates for decoding the control indicator.
  • the decoding candidate detecting unit 110 detects, in a second search space, a second subset of the decoding candidate set.
  • the second search space is different from the first search space.
  • the decoding unit 120 decodes the control indicator based on the first subset and the second subset of the decoding candidate set.
  • control indicator is a Downlink Control Indicator (DCI).
  • DCI Downlink Control Indicator
  • the first search space is a localized User Equipment (UE) specific enhanced Physical Downlink Control Channel (ePDCCH) search space.
  • UE User Equipment
  • ePDCCH enhanced Physical Downlink Control Channel
  • the second search space is one of: a distributed UE specific Physical Downlink Control Channel (PDCCH) search space, a distributed common PDCCH search space, a distributed common ePDCCH search space and a distributed UE specific ePDCCH search space.
  • PDCH Physical Downlink Control Channel
  • the method 300 further includes: detecting, in the first search space, a first subset of an aggregation level candidate set, the aggregation level candidate set containing possible aggregation level for the control channel; and detecting, in the second search space, a second subset of the aggregation level candidate set.
  • the first subset of the aggregation level candidate set corresponds to the first subset of the decoding candidate set and the second subset of the aggregation level candidate set corresponds to the second subset of the decoding candidate set.
  • Fig. 4 is a flowchart illustrating another method 400 for decoding a control indicator of a control channel according to the present invention.
  • the method 400 can be performed by the above UE 100.
  • the decoding candidate detecting unit 110 detects, in a first search space, only decoding candidates of a transmission-mode-independent control indicator (without detecting decoding candidates of a transmission-mode-dependent control indicator).
  • the control indicator is Downlink Control Indicator (DCI) Format 0/1A.
  • the decoding candidate detecting unit 110 detects, in a second search space, decoding candidates of the control indicator again.
  • the second search space is different from the first search space.
  • the decoding unit 120 decodes the control indicator based on the decoding candidates detected in the first search space and the decoding candidates detected in the second search space. As noted above, the decoding unit 120 performs Cyclic Redundancy Check (CRC) on the decoding candidates and determines the decoding candidate verified by the CRC as the decoding result of the control indicator.
  • CRC Cyclic Redundancy Check
  • Figs. 5a-5c are schematic diagrams showing search spaces according to the decoding method 400 of Fig. 4.
  • the abscissa represents frequency and the ordinate represents time slot;
  • the upper portion represents PDCCH control region according to Rel-10 (composed of CCEs) and the lower portion represents ePDCCH control region according to Rel-11 (composed of CCEs).
  • the detecting unit detects a transmission-mode-independent DCI format (such as DCI Format 0/1A) in a search space according to the old ePDCCH configuration parameters, without detecting any transmission-mode-dependent DCI format (such as DCI Format 2C). Then, the detecting unit detects the transmission-mode-independent DCI format (i.e., DCI Format 0/1A) again in a search space according to the new ePDCCH configuration parameters.
  • a transmission-mode-independent DCI format such as DCI Format 0/1A
  • the detecting unit detects a transmission-mode-independent DCI format (such as DCI Format 0/1A) in the old UE specific ePDCCH search space, without detecting any transmission-mode-dependent DCI format (such as DCI Format 2C). Then, the detecting unit detects the transmission-mode-independent DCI format (i.e., DCI Format 0/1A) again in the new UE specific PDCCH search space.
  • a transmission-mode-independent DCI format such as DCI Format 0/1A
  • the detecting unit detects a transmission-mode-independent DCI format (such as DCI Format 0/1A) in the old common ePDCCH search space, without detecting any common-search-space-dependent DCI format (such as DCI Format 1C). Then, the detecting unit detects the transmission-mode-independent DCI format (i.e., DCI Format 0/1A) again in the new common PDCCH search space.
  • a transmission-mode-independent DCI format such as DCI Format 0/1A
  • the detecting unit detects the transmission-mode-independent DCI format (i.e., DCI Format 0/1A) again in the new common PDCCH search space.
  • the solution of the present invention has been described above by a way of example only.
  • the present invention is not limited to the above steps and element structures. It is possible to adjust, add and remove the steps and elements structures depending on actual requirements. Thus, some of the steps and elements are not essential for achieving the general inventive concept of the present invention. Therefore, the features necessary for the present invention is only limited to a minimum requirement for achieving the general inventive concept of the present invention, rather than the above specific examples.

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de décodage d'un indicateur de commande d'un canal de commande et un équipement d'utilisateur (UE). Le procédé comprend les étapes consistant à : détecter, dans un premier espace de recherche, un premier sous-ensemble d'un ensemble candidat de décodage, l'ensemble de candidats de décodage contenant des candidats de décodage destinés à décoder l'indicateur de commande ; détecter, dans un deuxième espace de recherche, un deuxième sous-ensemble de l'ensemble de candidats de décodage, le deuxième espace de recherche étant différent du premier espace de recherche ; et décoder l'indicateur de commande sur la base du premier sous-ensemble et du deuxième sous-ensemble de l'ensemble de candidats de décodage.
PCT/JP2012/008399 2011-12-27 2012-12-27 Procédé de décodage d'un indicateur de commande d'un canal de commande et équipement d'utilisateur WO2013099268A1 (fr)

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US10193656B2 (en) 2015-10-30 2019-01-29 Huawei Technologies Co., Ltd. Systems and methods for adaptive downlink control information set for wireless transmissions
US10812219B2 (en) 2015-10-30 2020-10-20 Huawei Technologies Co., Ltd. Systems and methods for adaptive downlink control information set for wireless transmissions
US10412719B2 (en) 2016-10-21 2019-09-10 Qualcomm Incorporated Service type based control search space monitoring
US20220116875A1 (en) * 2019-01-10 2022-04-14 Telefonaktiebolaget Lm Ericsson (Publ) Wake-Up Signal (WUS) Controlled Actions
CN111758238A (zh) * 2020-05-25 2020-10-09 北京小米移动软件有限公司 物理下行控制信道的发送及接收方法、装置及电子设备
CN111758238B (zh) * 2020-05-25 2024-05-17 北京小米移动软件有限公司 物理下行控制信道的发送及接收方法、装置及电子设备
WO2023082772A1 (fr) * 2021-11-11 2023-05-19 中兴通讯股份有限公司 Procédé de commande pour dispositif terminal, dispositif terminal et support de stockage

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