WO2017194022A1 - Procédé, dispositif, et système de transmission d'informations de commande de liaison descendante - Google Patents

Procédé, dispositif, et système de transmission d'informations de commande de liaison descendante Download PDF

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WO2017194022A1
WO2017194022A1 PCT/CN2017/084279 CN2017084279W WO2017194022A1 WO 2017194022 A1 WO2017194022 A1 WO 2017194022A1 CN 2017084279 W CN2017084279 W CN 2017084279W WO 2017194022 A1 WO2017194022 A1 WO 2017194022A1
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dci
spdcch
stti
tti
level
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PCT/CN2017/084279
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English (en)
Chinese (zh)
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石靖
夏树强
左志松
张雯
韩祥辉
任敏
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中兴通讯股份有限公司
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Priority claimed from CN201610666794.4A external-priority patent/CN107371272B/zh
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2017194022A1 publication Critical patent/WO2017194022A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present disclosure relates to the field of communications, and in particular, to a method, an apparatus, and a system for transmitting downlink control information.
  • next-generation mobile communication technology Long Term Evolution (LTE)
  • LTE-Advance/LTE-A Long-Term Evolution Advance
  • 5G next-generation mobile communication technology
  • ultra-high speed, ultra-high capacity, ultra-high reliability, and ultra-low-latency transmission characteristics For the ultra-low latency index in 5G systems, it is currently recognized that the air interface delay is on the order of 1 ms.
  • a method for effectively implementing the ultra-low latency is to reduce the processing delay interval by reducing the transmission time interval (TTI) of the LTE system to support the characteristic requirement of the above 1 ms air interface delay.
  • TTI transmission time interval
  • OFDM Orthogonal Frequency Division Multiplexing
  • the method is in a 5G high frequency communication system. It is involved in both ultra-dense networks; another method is to reduce the TTI length by reducing the number of OFDM symbols in a single TTI as currently discussed by 3GPP.
  • the advantage of this method is that it can be fully compatible with current LTE systems. This article focuses on the latter method.
  • the downlink control information (DCI, Downlink Control Information) in the LTE system is carried by the downlink control channel (PDCCH) of the resource region occupying the first 0-4 OFDM symbols in the system bandwidth, or by using the downlink data traffic channel.
  • Enhanced downlink control channel (ePDCCH, Enhanced Physical Downlink) of some PRB resource areas in (PDSCH, Physical Downlink Shared Channel) Control Channel) can schedule 1ms TTI services. Compared with the current 1 ms TTI length subframe, the shortened TTI with fewer OFDM symbols is used as a new granular short TTI (sTTI), the length of the sTTI is less than 1 ms, and the possible length is 1-7 OFDM symbols. .
  • sTTI granular short TTI
  • the embodiments of the present disclosure provide a method, an apparatus, and a system for transmitting downlink control information, so as to at least solve the problem of lacking downlink control information supporting short TTI and related service scheduling in a low latency communication scenario in the related art.
  • a method for transmitting downlink control information including: carrying, by using at least one of a legacy physical downlink control channel legacy PDCCH, an enhanced physical downlink control channel ePDCCH, and an sPDCCH, a UE for scheduling sTTI a DCI, where the sPDCCH is a physical downlink control channel in the sTTI, and the bearer is sent to the terminal, where the DCI is used for scheduling the traffic channel, including at least one of the following: only the traffic channel in the sTTI; Traffic channel or traffic channel in 1ms TTI; traffic channel in sTTI and traffic channel in 1ms TTI.
  • the DCI of the UE for scheduling the sTTI is the same as the DCI for scheduling the 1 ms PDSCH, and is distinguished by the RNTI.
  • the DCIs of the UEs for scheduling sTTIs and the DCIs for scheduling 1ms PDSCHs are located in different search spaces;
  • the DCI of the UE for scheduling the sTTI is distinguished by the indication flag in the first-level DCI of the first-level DCI or the two-level DCI for scheduling the traffic channel in the 1 ms TTI or for scheduling the traffic channel in the sTTI.
  • the message carried by the traffic channel in the 1 ms TTI includes at least one of the following: a UE unicast message, or a cell broadcast message, or a public message of a group of UEs, or a cell System change message notification information for a level or group of UEs.
  • the scheduling information of the traffic channel is indicated by at least one of the following: the first level and the second level of the two-level DCI together form complete scheduling information; The second level in the DCI contains complete scheduling information.
  • the method further includes: using one of the modes or pre-defining one of the modes by the eNB by using a high layer signaling SIB or RRC notification.
  • the first-level DCI of the two-level DCI includes at least one of the following information: information indicating a parameter required for detecting an sPDCCH carrying a second-level DCI, where the second-level DCI includes scheduling sPDSCH and/or a second-level DCI of the sPUSCH; information indicating a DMRS port or a reserved RE when the sPDCCH and/or sPDSCH rate of the second-level DCI is matched; and demodulation using the pilot of the sPDCCH and/or the sPDSCH carrying the second-level DCI Information of CRS and/or DMRS; information indicating a transmission mode of sPDSCH; information indicating whether sPDCCH and/or sPDSCH carrying the second-level DCI is used based on CRS demodulation; indicating sPDCCH carrying the second-level DCI and/or Whether the sPDSCH is based on the information of the CRS when demodulating the DMRS; indicating the information of
  • the parameters required for detecting the sPDCCH that carries the second-level DCI include at least one of the following: an aggregation level, a number of candidate sets, a search space frequency domain location, a search space time domain location, an sPDCCH scrambling parameter, and an sPDCCH usage.
  • the first-level DCI of the two-level DCI includes information indicating a parameter required for detecting sPDCCH of the second-level DCI
  • the first-level DCI is indicated on a parameter of the RRC or SIB configuration.
  • a subset of the parameters of the RRC or SIB configuration, the subset comprising a subset of the parameter categories, and/or a subset of the parameter value ranges.
  • the second-level DCI of the two-level DCI includes at least one of the following information: when the two-level DCI forms a complete scheduling information, the second-level DCI includes information about resource allocation and is in the first An indication based on resource allocation in the first-level DCI; when the second level of the two-level DCI includes complete scheduling information, the second-level DCI includes information of resource allocation; indicating sPDSCH and/or sPUSCH resources Allocation information; information indicating a DMRS port or a reserved RE when the sPDSCH rate is matched; information indicating a PRB position where the DMRS is used for sPDSCH demodulation; information indicating a length of the DL sTTI and/or a length of the UL sTTI; indicating DL The sTTI binds the number of transmissions and/or the number of UL sTTI binding transmissions.
  • an update period of the first-level DCI in the two-level DCI is configured by a high-level signaling SIB or RRC.
  • the sPDSCH port is used to indicate the sPDSCH port by using the sPDCCH transmission mode.
  • the sPDSCH port usage principle includes at least one of the following: preferentially using the RE location of the DMRS with the sPDCCH. The same port, and secondly uses a port different from the RE location where the DMRS of the sPDCCH is located.
  • the DMRS resource location adopts different occupation manners according to whether the sPDCCH and the sPDSCH share the DMRS.
  • the DMRS frequency domain location shared by the sPDCCH and the sPDSCH when the DMRS frequency domain location shared by the sPDCCH and the sPDSCH is located in a part of the PRB, the DMRS frequency domain location shared by the sPDCCH and the sPDSCH includes at least one of the following: only in the PRB where the sPDCCH is located; at least in the PRB where the sPDCCH is located Medium; located in the PRB of the intermediate interval selected by the sPDCCH or sPDSCH.
  • the scrambling initialization method of the sPDCCH includes: the scrambling initialization method of the sPDCCH is independently scrambled in a subframe or in each sTTI in a radio frame, where the first sTTI or the legacy PDCCH region in the subframe sPDCCH scrambling initialization is satisfied c init is the scrambling initialization value, n s is the slot number, Is the cell identification number.
  • the scheduling of the 1 ms TTI traffic channel with reduced processing delay or the scheduling delay of the 1 ms TTI traffic channel is not reduced, and the scheduling manner includes the following at least One: 1ms TTI delay is reduced and 1ms TTI delay is not reduced.
  • Uniform DCI is used.
  • the content in the DCI is implicitly determined to be less than the preset TBS threshold, the 1ms TTI delay is reduced. Otherwise, The 1 ms TTI delay does not decrease; the 1 ms TTI delay decreases and the 1 ms TTI delay does not decrease.
  • the unified DCI is used, and the independent bit field display in the DCI indicates whether to perform 1 ms TTI delay reduction; 1 ms TTI delay decreases and 1 ms TTI Do not reduce the use of the respective DCI format.
  • the method when scheduling the 1 ms TTI service channel by using the DCI, the method further includes: performing, by using the high layer signaling SIB or the RRC, whether to perform the 1 ms TTI delay reduction.
  • the uplink data scheduling delay or the downlink data feedback delay k satisfies 0 ⁇ k ⁇ 4 and is an integer, and the value of k includes at least one of the following: an eNB and The UE side uses the same fixed k value, or the eNB and the UE side respectively use different fixed k values; the downlink and uplink use the same fixed k value, or the downlink and uplink respectively use different fixed k values; pass DCI or SIB or RRC Notifying the eNB and the UE side of the same k value, or notifying the eNB and the UE side of different k values by DCI or SIB or RRC; notifying the same k value for downlink and uplink by DCI or SIB or RRC, or by DCI or SIB Or RRC notifies the downlink and uplink of different k values.
  • indicating that the uplink HARQ process ID and/or the redundancy version RV includes at least one of the following manners: when the 1 ms TTI delay is not used.
  • the fixed bit field in the DCI is re-interpreted and then indicated; indicated by the independent bit field in the DCI; the CRC implicit indication is scrambled by different RNTI values.
  • the sPDCCH resource mode includes at least one of the following manners: when the sPDCCH is included in the sPDSCH frequency domain range, or when there is only one sPDCCH in the search space, the sPDSCH frequency domain is excluded by default.
  • All the resources except the sPDCCH are allowed to be used, or 1 bit in the DCI indicates whether the remaining resources in the search space where the sPDCCH is located are allowed to be used; when there are multiple sPDCCHs in the search space, when the candidate set fills the search space, the indication is not a candidate set to be used; indicating an unused control channel unit when the control channel unit occupies the search space; indicating an unused resource unit group or resource block when the resource unit group or the resource block occupies the search space; Indicates unused resource units when the search space is filled.
  • the indication range corresponding to the indication includes at least one of: a resource indicating that the sPDCCH is not used in the sPDSCH frequency domain range; a resource indicating that the sPDCCH is not used in the sTTI band frequency domain range; indicating in the SS where the sPDCCH is located
  • the short control channel unit sCCE used by the sPDCCH is composed of a short resource unit group sREG, and the composition manner includes at least one of the following manners: one sCCE is composed of a fixed number of sREGs; One sCCE consists of a different number of sREGs.
  • the method for detecting the DCI includes at least one of the following: attempting blind detection according to different sPDCCH detection positions corresponding to different sTTI lengths; and corresponding sTTI lengths
  • the sPDCCH detection positions are the same, but the respective pilot patterns in different sTTI lengths are respectively attempted to be demodulated in different rate matching manners; the sPDCCH detection positions corresponding to different sTTI lengths are the same and the same rate is used according to the pilots in the same position in the sPDCCH region at the same rate.
  • the matching method attempts to demodulate.
  • the DCI supports scheduling different TTI lengths and supporting whether the delay is reduced.
  • a method for transmitting downlink control information including: receiving, by using at least one of a legacy physical downlink control channel legacy PDCCH, an enhanced physical downlink control channel ePDCCH, and an sPDCCH, for scheduling
  • the DCI of the UE for scheduling the sTTI is the same as the DCI for scheduling the 1 ms PDSCH, and is distinguished by the RNTI.
  • the DCIs of the UEs for scheduling sTTIs and the DCIs for scheduling 1ms PDSCHs are located in different search spaces;
  • the DCI of the UE for scheduling the sTTI is distinguished by the indication flag in the first-level DCI of the first-level DCI or the two-level DCI for scheduling the traffic channel in the 1 ms TTI or for scheduling the traffic channel in the sTTI.
  • a transmission apparatus for downlink control information includes: a bearer module, configured to carry, by using at least one of a legacy physical downlink control channel legacy PDCCH, an enhanced physical downlink control channel ePDCCH, and an sPDCCH, a DCI of a UE for scheduling an sTTI, where the sPDCCH is a physical downlink in the sTTI And a sending module, configured to send the bearer DCI to the terminal, where the DCI is used for scheduling the traffic channel, including at least one of: a traffic channel only in the sTTI; a traffic channel in the sTTI or a 1 ms TTI Traffic channel in; traffic channel in sTTI and traffic channel in 1ms TTI.
  • the terminal UE includes: a receiving module, configured to receive a legacy physical downlink control channel legacy PDCCH, an enhanced physical downlink control channel ePDCCH,
  • the downlink control information DCI of the UE for scheduling the short transmission time interval sTTI, the sPDCCH is a physical downlink control channel in the sTTI
  • the scheduling module is configured to use the DCI for scheduling, where
  • the traffic channel used for scheduling by the DCI includes at least one of: a traffic channel only in the sTTI; a traffic channel in the sTTI or a traffic channel in the 1 ms TTI; a traffic channel in the sTTI and a traffic channel in the 1 ms TTI.
  • a transmission system for downlink control information including the foregoing transmission device for downlink control information of a base station, and the foregoing transmission device for downlink control information of the terminal are provided.
  • a storage medium is also provided.
  • the storage medium is configured to store program code for performing: transmitting, by at least one of legacy PDCCH, ePDCCH, sPDCCH, DCI of a UE for scheduling sTTI, the sPDCCH being a physical downlink control channel in an sTTI;
  • the DCI is sent to the terminal; wherein the traffic channel used by the DCI for scheduling includes at least one of: a traffic channel only in the sTTI; a traffic channel in the sTTI or a traffic channel in the 1 ms TTI; a traffic channel in the sTTI And the traffic channel in the 1ms TTI.
  • the storage medium is further configured to store program code for performing the following steps: receiving, by using at least one of legacy PDCCH, ePDCCH, and sPDCCH, for scheduling sTTI
  • the DCI of the UE is the physical downlink control channel in the sTTI; the UE uses the DCI for scheduling; wherein the traffic channel used by the DCI for scheduling includes at least one of the following: a traffic channel only in the sTTI Traffic channel in sTTI or traffic channel in 1ms TTI; traffic channel in sTTI and traffic channel in 1ms TTI.
  • the DCI of the UE for scheduling the sTTI is carried in at least one of the legacy PDCCH, the ePDCCH, and the sPDCCH, and is sent to the UE, which solves the short support in the low-latency communication scenario in the related art.
  • the problem of downlink control information for TTI and its related service scheduling is given.
  • the implementation scheme of supporting short TTI scheduling and its related different length TTI service scheduling is given to ensure the delay communication requirement.
  • FIG. 1 is a flowchart of a method for transmitting downlink control information according to an embodiment of the present disclosure
  • FIG. 2(a) is a diagram 1 showing an example of the composition of sCCE/sREG according to an embodiment of the present disclosure
  • FIG. 2(b) is a diagram 2 showing an example of the composition of sCCE/sREG according to an embodiment of the present disclosure
  • 2(c) is an exemplary diagram 3 of a manner of composition of sCCE/sREG according to an embodiment of the present disclosure
  • FIG. 3 is a structural block diagram of a transmission apparatus for downlink control information according to an embodiment of the present disclosure
  • FIG. 5 is a structural block diagram of another transmission apparatus for downlink control information according to an embodiment of the present disclosure.
  • FIG. 6 is a structural block diagram of a transmission system of downlink control information according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of an sPDCCH occupying resources only in a portion of an sPRB in a first OFDM symbol in an sTTI according to a preferred embodiment of the present disclosure
  • FIG. 8 is a DMRS requirement in a PRB where an sPDCCH is located according to a preferred embodiment of the present disclosure. Schematic diagram shared with sPDSCH;
  • FIG. 9 is a schematic diagram of a portion of a PRB in which a sPDSCH is located, without sharing a DMRS with an sPDCCH, in accordance with a preferred embodiment of the present disclosure.
  • the embodiments of the present disclosure provide a method for transmitting downlink control information, which can solve the problem of designing downlink control information in short TTIs with fewer OFDM symbols, and support short TTI scheduling and different length TTI service scheduling. Problem, guarantee delay communication needs.
  • FIG. 1 is a flowchart of a method for transmitting downlink control information according to an embodiment of the present disclosure. As shown in FIG. 1, the method includes the following steps:
  • Step S102 Carrying, by using at least one of a legacy physical downlink control channel (Legacy PDCCH), an enhanced physical downlink control channel (ePDCCH), and an sPDCCH (Short PDCCH), a downlink (UE) for scheduling a short transmission time interval (sTTI) Control information (DCI), the sPDCCH is a physical downlink control channel in the sTTI;
  • Legacy PDCCH legacy physical downlink control channel
  • ePDCCH enhanced physical downlink control channel
  • Short PDCCH short PDCCH
  • DCI Control information
  • the sPDCCH is a physical downlink control channel in the sTTI;
  • Step S104 the bearer of the DCI is sent to the terminal.
  • the service channel in which the DCI is used for scheduling includes at least one of the following:
  • Traffic channel in sTTI and traffic channel in 1ms TTI are traffic channel in sTTI and traffic channel in 1ms TTI.
  • the DCI of the UE for scheduling the sTTI is carried in at least one of the legacy PDCCH, the ePDCCH, and the sPDCCH, and is sent to the UE, which solves the problem that the short TTI is supported in the low-latency communication scenario in the related art.
  • an implementation scheme supporting short TTI scheduling and its associated different length TTI service scheduling is given to ensure delay communication requirements.
  • Legacy PDCCH and ePDCCH in this paper mainly describe a legacy PDCCH and an ePDCCH in an LTE system.
  • the size of the DCI of the UE for scheduling the sTTI is the same as the size of the DCI for scheduling the 1 ms PDSCH, and is distinguished by the RNTI, including distinguishing by different values of different types of RNTIs. Or distinguish by different values of the same type of RNTI.
  • the different scrambling code RNTI of the first-level DCI of the first-level DCI or the two-level DCI may be used to distinguish whether the DCI is used for scheduling a traffic channel in a 1 ms TTI or for scheduling a traffic channel in an sTTI.
  • it may be used to schedule only the traffic channel in the sTTI; or to schedule a traffic channel in the sTTI or a traffic channel in the 1 ms TTI; or to schedule a traffic channel in the sTTI and a traffic channel in the 1 ms TTI.
  • the DCI of the UE for scheduling the sTTI and the DCI for scheduling the 1 ms PDSCH are located in different search spaces. It can be distinguished by restricting the search space (Search Space, referred to as SS) in which the DCIs of different service channels are scheduled, for example, respectively located in CSS or USS, respectively in the Legacy search space and the newly defined search space. Preferably, it can be used to schedule only the traffic channel in the sTTI; schedule the traffic channel in the sTTI or the traffic channel in the 1 ms TTI; schedule the traffic channel in the sTTI and the traffic channel in the 1 ms TTI.
  • Search Space Search Space
  • the method is preferably used to schedule a traffic channel in sTTI or 1 ms The situation when the traffic channel is in the TTI.
  • the message carried by the traffic channel in the 1 ms TTI may include at least one of the following: a UE unicast message, or a cell broadcast message, or a common message of a group of UEs, or a system change of a cell level or a group of UEs.
  • Message notification information may include at least one of the following: a UE unicast message, or a cell broadcast message, or a common message of a group of UEs, or a system change of a cell level or a group of UEs.
  • the downlink control information may be a first-level DCI or a two-level DCI, where the traffic channel scheduling information indicated when the DCI is two-level DCI may include at least one of the following: two-level DCI The first level and the second level together constitute complete scheduling information; the second level of the two-level DCI contains complete scheduling information.
  • the terminal demodulates the slow DCI and skips to the next subframe to continue detecting the slow DCI without Detect the fast DCI in this sub-frame.
  • the terminal demodulates the slow DCI and continues to detect the fast DCI in this subframe.
  • both the first-level and second-level DCIs contain resource allocation information and the second-level resource allocation is based on the first-level resource allocation.
  • both the first-level DCI and the second-level DCI contain resource allocation information and the second-level resource allocation does not depend on the first-level resource allocation.
  • the first-level DCI includes the detection information required to indicate the second-level DCI to reduce the second-level DCI detection complexity, but even if the first-level DCI is not detected, the terminal can still detect the parameters according to the high-level signaling RRC or SIB configuration. Second level DCI.
  • one of the above two methods may be used by the base station (eNB) through the high layer signaling RRC or SIB notification or one of the above two methods may be predefined.
  • At least one of the following information may be included in the first level DCI:
  • Determining a parameter required for sPDCCH detection of a second-level DCI where the second-level DCI includes a second-level DCI that schedules sPDSCH and/or sPUSCH, where the parameter may include an aggregation level, a number of candidate sets, and a search space frequency domain. At least one of a location, a search space time domain location, an sPDCCH scrambling parameter, a DMRS scrambling parameter used by the sPDCCH, an sPDCCH transmission mode, and a DMRS port used for sPDCCH demodulation;
  • the reserved RE is preferably an RE corresponding to all the DMRS ports, or an RE corresponding to the port occupying the same RE;
  • DL downlink
  • UL uplink
  • the first-level DCI indicates a parameter required for detecting sPDCCH of the second-level DCI, indicating a subset of parameters of the RRC or SIB configuration based on parameters of the RRC or SIB configuration.
  • the subset may include a subset of the parameter categories, and/or a subset of the parameter value ranges.
  • the second level DCI may include at least one of the following information:
  • the second level DCI includes resource allocation and is indicated on the basis of resource allocation in the first level DCI;
  • the reserved RE is preferably the RE corresponding to all the DMRS ports, or the RE corresponding to the port occupying the same RE;
  • an update period of the first-level DCI in the two-level DCI may be configured by a high-level signaling SIB or RRC. This method can be applied to the case where the fast DCI has complete scheduling information. When a slow DCI demodulation error occurs, but is still within the update period range, the previous slow DCI indication is used to reduce the fast DCI demodulation complexity.
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used secondly;
  • the sPDSCH port is indicated by the DCI in combination with the sPDCCH transmission mode.
  • the sPDSCH port may be not indicated when the sPDSCH is used in the DCI, or the same port as the RE where the sPDCCH is used by the sPDCCH, and the sPDCCH uses port x1, sPDSCH. Also use port x1, or use port x2 with the same RE location as port x1.
  • the sPDSCH layer 2 transmission may not indicate, and the corresponding port is used according to the sPDCCH transmission mode.
  • the sPDSCH uses the port x1 and x2 of the same RE position as the port x1, and the port x1 and y1 are used when the sPDCCH transmission mode is used.
  • sPDSCH makes Use port x1, x2 at the same RE position as port x1, or port y1, y2 at the same RE position as port y1, or use port x1, y1 (preferred), or indicate the port corresponding to the sPDCCH transmission mode, when sPDCCH transmission mode
  • port x1 it indicates that sPDSCH uses ports x1 and x2 of the same RE position as port x1.
  • sPDSCH uses port x1 and x2 of the same RE position as port x1, or is the same as port y1.
  • Port y1, y2 of the RE position, or port x1, y1 (preferred).
  • the sPDSCH uses more than Layer 2 transmission, it may not indicate that the corresponding port is used according to the transmission mode.
  • the sPDCCH transmission mode uses port x1
  • the sPDSCH uses the port x1, x2, x3, ... of the same RE position as the port x1, when the sPDCCH is transmitted.
  • port x1 and y1 are used, sPDSCH uses port x1, x2, x3, ...
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used next.
  • the DMRS resource location may adopt different occupation manners according to whether the sPDCCH and the sPDSCH share the DMRS.
  • the possible DMRS resource occupation manner is as follows.
  • the partial PRB is located in the PRB where the sPDCCH is located, at least in the PRB where the sPDCCH is located, and is located in the PRB resource occupied by the sPDCCH or the sPDSCH.
  • the selected PRB is medium; if the sPDCCH and the sPDSCH do not share the DMRS, the DMRS resource occupation mode may be equal to the PRB selected by each PRB and located at the middle interval of the PRB resources occupied by the sPDSCH.
  • the DMRS frequency domain location shared by the sPDCCH and the sPDSCH is located in a part.
  • PRB include at least one of the following occupation methods:
  • the PRB is located in the PRB of the intermediate interval of the PDCCH occupied by the sPDCCH or the sPDSCH.
  • the max ⁇ sPDCCH occupies the PRB resource
  • the sPDSCH occupies the PRB resource ⁇ .
  • the scrambling initialization method of the sPDCCH is that each sTTI in the subframe or the radio frame is independently scrambled, wherein the sPDCCH scrambling initialization in the first sTTI or the legacy PDCCH region in the subframe satisfies c init is the scrambling initialization value, n s is the slot number, It is the identification (ID) number of the cell.
  • the scheduling of the 1 ms TTI traffic channel with reduced processing delay or the scheduling of the 1 ms TTI traffic channel without processing delay is supported. Including at least one of the following:
  • Manner 1 1ms TTI delay is reduced and 1ms TTI delay is not reduced. Use unified DCI.
  • the TBS is less than the preset TBS threshold in the DCI (for example, the resource allocation RA and the modulation and coding mode MCS)
  • the TBS is small, and the 1 ms TTI delay can be reduced. Otherwise, the 1 ms TTI delay is supported. Not lowering.
  • Manner 2 1 ms TTI delay is reduced and 1 ms TTI delay is not reduced. Use unified DCI.
  • the display of the independent bit field in the DCI indicates whether to perform the 1 ms TTI delay reduction.
  • Mode 3 1 ms TTI delay is reduced with 1 ms TTI delay is not reduced using the respective DCI format.
  • the method when scheduling the 1 ms TTI service channel by using the DCI, the method further includes: performing, by using the high layer signaling SIB or the RRC, whether to perform the 1 ms TTI delay reduction.
  • the k value manner includes at least one of the following:
  • Manner 1 Fixed value, including eNB and UE side respectively using the same k value, or eNB Different values are used for the UE side and the UE side; the same k value is used for the downlink and uplink, respectively, or different k values are used for the downlink and uplink respectively.
  • Manner 2 non-fixed value, the k value is notified by DCI or SIB or RRC, including notifying the eNB and the UE side of the same k value, or notifying the eNB and the UE side of different k values; the same k for the downlink and uplink notifications Value, or different k values for downstream and upstream notifications.
  • k is the uplink data scheduling delay or the downlink data feedback delay.
  • k 4 for the FDD system and k ⁇ 4 for the TDD system.
  • delay reduction the delay is smaller than the current LTE system, and k is a positive integer less than 4.
  • TBS threshold fixed or SIB/RRC configurable. From the perspective of different UE capabilities, the RRC is configured to configure the TBS threshold.
  • the DCI indicates whether to perform the 1ms TTI delay reduction.
  • the TBS threshold is not needed at this time and is completely determined by the DCI dynamic scheduling.
  • the DCI is a DCI that introduces a new bit field. For example, when the 1 ms TTI delay is reduced, the PUCCH resource indication and the newly designed RA may be added to the DCI. At this time, the small TBS does not necessarily perform the 1 ms TTI delay.
  • Sub-method 1 Increase the execution condition of If used for latency reduction mode for format 0/4. At this time, adding the DCI size of the new bit field does not exceed the size of the original legacy format 0/4, that is, it needs to compress other bit fields (such as RA), and there is a new design.
  • Sub-method 2 Add the bit field directly in format 0/4, otherwise reserved if not used. The corresponding format 1A may complement padding.
  • whether the 1ms TTI delay is reduced including: through DCI or SIB/RRC 1 bit indicates whether to perform a 1 ms TTI delay reduction, or indicates one of the k value sets by x bit in DCI or SIB/RRC, or indicates a k value set by x bit in SIB/RRC.
  • both of the above methods can support only one or more values of k when the 1 ms TTI delay is reduced.
  • the RRC notification can be used.
  • the k value is not unique and can be notified by DCI or RRC.
  • the 1 ms TTI delay is reduced, there are two cases: the eNB has the same k value as the UE, or the eNB has a different k value from the UE.
  • the k value is unique when the 1 ms TTI delay is reduced, and includes two cases: the eNB has the same k value as the UE, or the eNB and the UE have different k values.
  • Manner 1 1ms TTI delay is reduced and 1ms TTI delay is not reduced. Use unified DCI. Same as dynamic one. At this time, the TBS cannot be too large, and only a small TBS is allocated semi-static.
  • Manner 2 1 ms TTI delay is reduced and 1 ms TTI delay is not reduced. Use unified DCI. Same as dynamic mode two. It is completely determined by the schedule, and one of them is semi-statically executed.
  • Mode 3 1 ms TTI delay is reduced with 1 ms TTI delay is not reduced using the respective DCI format. Use only one of them semi-static.
  • the default new UE can perform delay reduction.
  • the delay is configured when the new UE is not configured to perform 1 ms TTI, even if the small TBS does not perform the 1 ms TTI delay, and only when the high-level signaling configuration can be executed, the further TBS is performed.
  • the 1ms TTI delay is reduced.
  • the 1 ms TTI delay is definitely reduced.
  • indicating an uplink HARQ process number and or a redundancy version (RV) includes at least one of the following manners. :
  • the UL grant needs to introduce a UL HARQ process number (2 to 4 bits) and an RV (1 to 2 bits).
  • Option 1 Existing bit field reinterpretation.
  • the UL HARQ process number 2 bits and the RV 1 bit are implemented by the DMRS CS/OCC bit field 3 bits and the DMRS CS/OCC fixed or RRC configuration of the UE.
  • Option 2 Pass RNTI.
  • the UL HARQ process number and the RV are determined by a plurality of different C-RNTIs of the UE.
  • multiple C-RNTIs are allocated to the UE through the RRC, and the correspondence between the values of the different C-RNTIs and the process number and the RV version is clarified.
  • DCI is a DCI that introduces a new bit field. That is, the UL HARQ process number and RV are independent bit fields.
  • Option 1 Add in existing format 0/4. DCI is still an existing format. Increase the UL HARQ process number and RV for format 0/4, that is, when the remaining delay does not decrease. In addition, format 1A may need to fill padding.
  • DCI is the new format. After adding the UL HARQ process number and RV, whether other bit fields are newly designed or not.
  • the process number bit field size may use different size bit fields, or the size corresponding to the largest number of processes in different TTIs.
  • indicating an unused sPDCCH resource manner includes at least one of the following manners:
  • Mode S1 When only the sPDCCH scheduling the sPDCCH in the sPDSCH frequency domain range or when there is only one sPDCCH in the search space, all resources except the sPDCCH may be used in the sPDSCH frequency domain by default, or in the DCI.
  • the first bit indicates whether the remaining resources in the search space where the sPDCCH is located are usable.
  • Mode S2 when there are multiple sPDCCHs in the search space, indicating that the candidate set is not used when the candidate set fills the search space; indicating the unused control channel unit when the control channel unit fills the search space; Indicates an unused resource unit group or resource block when the group or resource block fills the search space; indicates an unused resource unit when the resource unit fills the search space;
  • the indication range corresponding to the indication includes at least one of the following manners:
  • Mode 1 A resource indicating that the sPDCCH is not used is indicated in the sPDSCH frequency domain range.
  • (Mode 2) Indicates resources that are not used by the sPDCCH in the sTTI band frequency domain range.
  • Mode 3 A resource that is not used by the sPDCCH is indicated in a search space (referred to as SS) in which the sPDCCH is located.
  • SS search space
  • Mode 4 Indicates resources that are not used by the sPDCCH in all SS or sTTI band frequency domain ranges.
  • mode 1 When in the TDM mode and in the first OFDM symbol, mode 1: occupy all frequency domain resources: (similar to the PDCCH region frequency domain occupies full bandwidth). Indicates unused REG or RB (fine graininess); indicates unused CCE or candidate set (coarse granularity); (CRS position UE is known).
  • Mode 2 Partial frequency domain resources: Indicates unused sREG or RB; indicates unused CCE or candidate set.
  • Mode 2-1 When all UEs have only one short TTI SS, it indicates that no RB or sCCE is used.
  • Mode 2-2 When all UEs have more than one short TTI SS, when the sPDSCH is only possible to use unused resources in the SS, it indicates that the RB or sCCE is not used in the SS, and is applicable to the DL service self-contained DL control. . When the sPDSCH may use other resources not used in the SS, it is necessary to indicate that the RBs are not used in all the SSs, and also indicate the frequency domain range of all the SSs.
  • mode 1 occupies resources in a (2 OFDM symbol, 1 RB) minimum granularity mode: indicates an unused RB or CCE or candidate set.
  • Mode 2 is (1 OFDM symbol, 1 RB) minimum granularity mode or when EREG occupies resources: indicates an unused sCCE or a candidate set.
  • the TDM mode there is also a problem that all UEs have one or more short TTI SSs.
  • the sPDSCH may use unused resources in other SSs, it also indicates the frequency domain range of all SSs.
  • the resource granularity is assumed to be the candidate set > sCCE > RB / sREG > RE:
  • the overhead is considered, and the DCI should not be too large, and it is expected to be about 2 to 4 bits.
  • the unused candidate set is indicated, and when all the detected candidate sets occupy the SS: the candidate set numbers that are not used in the N candidate sets are indicated.
  • Determination of N Select 1. Only 1 SS or only SS for its own when there are multiple SSs (multi-UE shared SS): Consider the total number of blind detections in each sTTI, and the N value is based on the candidate set. In the case of 2 to 4, the unused candidate set overhead is saved by 2-4 bits, and then the corresponding sCCE or RB or sREG resource can be converted.
  • the 2.sPDSCH self-contained sPDCCH is selected (single UE exclusive SS): only 1 bit can be used to indicate whether resources other than sPDCCH occupancy are available or not.
  • Select 3. When there are multiple SSs: the N value corresponding to the entire symbol in the sTTI band or the scheduled sPDSCH range. The overhead is greater than option 1.
  • the control channel unit fills the search space, the unused control channel unit is indicated, and the candidate set does not occupy the SS, indicating the unused sCCE sequence number in the N sCCEs, similar to the above, the overhead is increased; Or a resource block fills the search space Indicates an unused resource unit group or a resource block.
  • the CCE does not fill the SS, indicating that the sREG or RB sequence number is not used in the N sREGs or RBs, and the overhead is larger; when the resource unit fills the search space, the indication is not The resource unit used is the most expensive at this time.
  • the sPDCCH may be used as the resource that is not used for the sPDCCH, and may be used when allocating the sPDSCH resource, that is, the sPDCCH is not used when the resource used by the sPDSCH is allocated.
  • the resources are allocated to the sPDSCH, ie no additional signaling indication is required.
  • different symbols belong to different sPDSCHs in order to avoid the same PRB.
  • a limit may be added.
  • the RB occupied by the sPDCCH must be the RB occupied by the sPDSCH, and the RA in the DCI only needs to allocate the RBs of other locations.
  • sPDSCH is occupied by sREG as granularity
  • sCCE/sREG is composed of RBG
  • sCCE/sREG is still composed of RB but allocated Only one RB of the four RBs corresponding to each RBG can be allocated in the SS.
  • composition of sCCE/sREG ie, sCCE and/or sREG
  • at least one of the following methods is included:
  • Mode 3 Still use REG, CCE definition. Not applicable when using DMRS demodulation.
  • sREG is the sequence number of the X PRBs after subtracting the CRS and or DMRS. Then, sCCE is formed according to the ECCE method.
  • sCCE/sREG is based on RBG or PRG.
  • the sCCE is composed of 4 REBs, that is, 1 REG.
  • the sCCE includes 4 sREGs, and 1 sREG consists of 1 RB.
  • Example 1 TDM mode 1, as shown in FIG. 2(a), the sPDCCH region is all the first OFDM symbols, the resources occupied by the sPDCCH of the UE1 are PRB1, 3, and 5, and the other sPDCCHs occupy the PRBs 4, 6, and 8.
  • the sPDSCH occupied resource of UE1 is PRB1-8.
  • Example 2 In TDM mode 2, as shown in Figure 2(b), only one short TTI SS is PRB1-8, the sPDSCH of UE1 occupies PRB1-10, and the sPDCCH of UE1 occupies PRB1, 3, and 5.
  • the PRB 2, 7 is not used by the sPDCCH according to the mode 1 or 2.
  • Example 3 TDM mode 2, as shown in Figure 2(b), there are only 2 short TTI SSs, the first SS is PRB1-6, the second SS is PRB3-8, and the sPDSCH of UE1 occupies PRB1-10.
  • the sPDCCH of UE1 is located in the first SS and occupies PRB1, 3, and 5. In this case, only PRB2 and 7 are not used by sPDCCH according to mode 1 or 2, and the frequency domain range of the second SS needs to be notified to the UE1.
  • Example 4 In the FDM mode, as shown in Figure 2(c), only one short TTI SS is PRB1-4, the sPDCCH of UE1 occupies CCE1, the other sPDCCH occupies CCE2, and the remaining CCE3 is unused. The scheduled sPDSCH of UE1 occupies PRB1-10. At this time, according to mode 1 or 2, CCE3 is not used in the SS.
  • the manner of detecting the DCI includes at least one of the following:
  • Mode 1 respectively, try blind detection according to different sTTI lengths, including: different sPDCCH detection positions corresponding to different sTTI lengths; sPDCCH corresponding to different sTTI lengths The detection positions are the same but the demodulation is attempted separately according to the respective pilot patterns of different sTTI lengths in different rate matching manners.
  • Mode 2 Try blind detection without distinguishing between different sTTI lengths.
  • the method includes: the sPDCCH detection positions corresponding to different sTTI lengths are the same, and the pilots in the same position according to the same position in the sPDCCH region try to demodulate in the same rate matching manner.
  • the sPDCCH blind detection only needs to follow the DMRS in the specific sTTI.
  • the blind detection of the sPDCCH has no problem.
  • the sPDCCH is sPDCCH
  • the DMRS defaults to one RE in the frequency domain and occupies 3 REs.
  • the DMRS defaults to one RE in the frequency domain and occupies 3 REs.
  • the DCI usage mode includes at least one of the following:
  • TTI 1 slots (for example, 7 OFDM symbols)
  • 1 ms TTI for example, 14 OFDM symbols
  • 1 ms TTI delay are not reduced.
  • the DCI format that is, also includes whether the delay is reduced at 1 ms TTI.
  • the DCI format or the two-level DCI, the above three DCI formats are different from each other.
  • the mode 1 is equivalent to a unified design, that is, the UE supporting the reduced delay at this time uses a DCI.
  • Alt.1 is based on the existing format 0/1A, adds the bit field, and uses RRC to configure the TTI length.
  • Alt.2 is based on the newly designed DCI format, which uses the TTI length indication, single-level DCI or slow DCI.
  • Advantages Unified DCI design. Disadvantages: alt.1 does not support dynamic scheduling of PDSCH and sPDSCH.
  • Alt.2 is necessary for the single-level DCI except that the first sTTI in the subframe has a TTI length indication, and the other sTTI indications are useless.
  • the TTI length When the TTI length is not known when detecting fast DCI or single-level DCI, it can be semi-statically configured through high-level signaling, or DCI can be blindly checked according to different TTI lengths, one or two in the same way as G. Moreover, when the TTI length is not indicated in the DCI, the other bit fields corresponding to different TTI lengths are all the same at this time.
  • Reason 3 The 1 ms delay does not reduce the use of the existing legacy DCI, and the rest of the delay reduction can use common features such as asynchronous UL HARQ.
  • Modes 5 and 6 consider three DCIs, that is, the 1 ms TTI delay does not decrease.
  • distinguishing too many DCI formats adds complexity to UE blind detection.
  • the 1 ms TTI delay is reduced and the same DCI format is used for the 1 ms TTI existing delay, the following possible ways are included: 1. Use the existing DCI without modification. When the PHICH is still used to feed back ACK/NACK to the PUSCH, the 1 ms delay reduction is implicitly determined by the TBS. 2. Add a new bit field directly. It may be new DCI format, or it may be modified directly in format 0 or 4 to increase the bit field. It is possible to add a UL HARQ process number, RV (asynchronous HARQ) in Format 0/4, and a timing k indication may be added in format 0 or 4 or 1A. Affects format 1A to increase padding.
  • RV asynchronous HARQ
  • the sTTI DCI can also be supported when a new bit field is added at this time.
  • the newly added bit field can be reserved.
  • the respective bit fields can be defined separately. 3.
  • DCI bit field reuse When the PHICH is not used, the UL grant needs to add the UL HARQ process number, RV, and the reinterpreted bit field is used when implicitly performing a 1 ms delay reduction according to the RRC configuration according to the TBS or display or according to different C-RNTI scrambling.
  • the remaining bit fields of different TTI lengths may be separately designed.
  • the bit field mainly functions in the first sTTI or legacy PDCCH region.
  • the remaining bit fields of different TTI lengths need to be uniformly designed.
  • the TTI length can be semi-statically configured by the high layer signaling or a fixed value.
  • a The transmission device of the line control information is located in the base station, and the device is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 3 is a structural block diagram of a transmission apparatus for downlink control information according to an embodiment of the present disclosure. As shown in FIG. 3, the apparatus includes:
  • the bearer module 22 is configured to carry downlink control information DCI of the terminal UE for scheduling the short transmission time interval sTTI by using at least one of a legacy physical downlink control channel (legacy PDCCH), an enhanced physical downlink control channel (ePDCCH), and an sPDCCH.
  • legacy PDCCH legacy physical downlink control channel
  • ePDCCH enhanced physical downlink control channel
  • sPDCCH sPDCCH
  • the sPDCCH is a physical downlink control channel in the sTTI; the sending module 24 is connected to the bearer module 22, and is configured to send the DCI carried by the bearer module 22 to the terminal; where the DCI is used for scheduling the traffic channel, including at least the following One: only the traffic channel in the sTTI; the traffic channel in the sTTI or the traffic channel in the 1 ms TTI; the traffic channel in the sTTI and the traffic channel in the 1 ms TTI.
  • the apparatus may further include a notification module, configured to use one of the foregoing two manners by using the high layer signaling RRC or the SIB notification or to use one of the foregoing two methods.
  • a notification module configured to use one of the foregoing two manners by using the high layer signaling RRC or the SIB notification or to use one of the foregoing two methods.
  • the apparatus may further include: a configuration module, configured to configure an update period of the first-level DCI in the two-level DCI by using high-level signaling SIB or RRC.
  • a configuration module configured to configure an update period of the first-level DCI in the two-level DCI by using high-level signaling SIB or RRC. This method can be applied to the case where the fast DCI has complete scheduling information.
  • the previous slow DCI indication is used to reduce the fast DCI demodulation complexity.
  • the apparatus may further include a port selection module configured to select to use a corresponding sPDSCH port according to a port usage principle.
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used secondly;
  • the sPDSCH port is indicated by the DCI in combination with the sPDCCH transmission mode.
  • the sPDSCH port may be not indicated when the sPDSCH is used in the DCI, or the same port as the RE where the sPDCCH is used by the sPDCCH, and the sPDCCH uses port x1, sPDSCH. Also use port x1, or use port x2 with the same RE location as port x1.
  • the sPDSCH layer 2 transmission may not indicate, and the corresponding port is used according to the sPDCCH transmission mode.
  • the sPDSCH uses the port x1 and x2 of the same RE position as the port x1, and the port x1 and y1 are used when the sPDCCH transmission mode is used.
  • the sPDSCH uses port x1, x2 of the same RE location as port x1, or port y1, y2 of the same RE location as port y1, or uses port x1, y1 (preferred), or indicates a port corresponding to the sPDCCH transmission mode
  • the sPDSCH is instructed to use the ports x1 and x2 of the same RE position as the port x1, and when the sPDCCH transmission mode uses the ports x1 and y1, the sPDSCH uses the port x1, x2 of the same RE position as the port x1, or Port y1 port y1, y2 at the same RE position, or port x1, y1 (preferred).
  • the sPDSCH uses more than Layer 2 transmission, it may not indicate that the corresponding port is used according to the transmission mode.
  • the sPDCCH transmission mode uses port x1
  • the sPDSCH uses the port x1, x2, x3, ... of the same RE position as the port x1, when the sPDCCH is transmitted.
  • port x1 and y1 are used, sPDSCH uses port x1, x2, x3, ... at the same RE position as port x1, or port y1, y2, y3, ... at the same RE position as port y1, or uses port x1, y1, x2.
  • the sPDSCH uses the same RE position as the port x1, and when the sPDCCH transmission mode uses the ports x1, y1, the sPDSCH uses the port x1, x2 of the same RE position as the port x1 , x3..., or port y1, y2, y3... at the same RE position as port y1, or using ports x1, y1, x2, y2, ... (preferred);
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used next.
  • the apparatus may further include a scrambling module configured to scramble the sPDCCH.
  • the scrambling initialization method of the sPDCCH is that each sTTI in the subframe or the radio frame is independently scrambled, wherein the sPDCCH scrambling initialization in the first sTTI or the legacy PDCCH region in the subframe satisfies c init is the scrambling initialization value, n s is the slot number, It is the identification (ID) number of the cell.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination.
  • the forms are located in different processors.
  • FIG. 4 is a flowchart of another method for transmitting downlink control information according to an embodiment of the present disclosure. As shown in FIG. 4, the method includes The following steps:
  • Step S302 receiving downlink control information (DCI) of a terminal (UE) for scheduling a short transmission time interval (sTTI) carried by at least one of a legacy physical downlink control channel legacy PDCCH, an enhanced physical downlink control channel ePDCCH, and an sPDCCH,
  • DCI downlink control information
  • UE terminal
  • sTTI short transmission time interval
  • the sPDCCH is a physical downlink control channel in an sTTI
  • Step S304 the UE uses the DCI to perform scheduling.
  • the service channel in which the DCI is used for scheduling includes at least one of the following:
  • Traffic channel in sTTI and traffic channel in 1ms TTI are traffic channel in sTTI and traffic channel in 1ms TTI.
  • the DCI of the UE for scheduling the sTTI is carried in at least one of the legacy PDCCH, the ePDCCH, and the sPDCCH, and the UE uses the DCI to perform scheduling, which solves the short support in the low-latency communication scenario in the related art.
  • the problem of downlink control information for TTI and its related service scheduling is given to support short TTI scheduling and its associated different length TTIs.
  • the implementation of the service scheduling ensures the delay communication requirements.
  • the size of the DCI of the UE for scheduling the sTTI is the same as the size of the DCI for scheduling the 1 ms PDSCH, and is distinguished by the RNTI, including distinguishing by different values of different types of RNTIs. Or distinguish by different values of the same type of RNTI.
  • the different scrambling code RNTI of the first-level DCI of the first-level DCI or the two-level DCI may be used to distinguish whether the DCI is used for scheduling a traffic channel in a 1 ms TTI or for scheduling a traffic channel in an sTTI.
  • it may be used to schedule only the traffic channel in the sTTI; or to schedule a traffic channel in the sTTI or a traffic channel in the 1 ms TTI; or to schedule a traffic channel in the sTTI and a traffic channel in the 1 ms TTI.
  • the DCI of the UE for scheduling the sTTI and the DCI for scheduling the 1 ms PDSCH are located in different search spaces. It can be distinguished by restricting the search space in which the DCIs of different service channels are scheduled, for example, respectively located in CSS or USS, respectively in the Legacy search space and the newly defined search space. Preferably, it can be used to schedule only the traffic channel in the sTTI; schedule the traffic channel in the sTTI or the traffic channel in the 1 ms TTI; schedule the traffic channel in the sTTI and the traffic channel in the 1 ms TTI.
  • the method is preferably used to schedule a traffic channel in an sTTI or a traffic channel in a 1 ms TTI.
  • the message carried by the traffic channel in the 1 ms TTI may include at least one of the following: a UE unicast message, or a cell broadcast message, or a common message of a group of UEs, or a system change of a cell level or a group of UEs.
  • Message notification information may include at least one of the following: a UE unicast message, or a cell broadcast message, or a common message of a group of UEs, or a system change of a cell level or a group of UEs.
  • the downlink control information may be a first-level DCI or a two-level DCI, where the traffic channel scheduling information indicated when the DCI is two-level DCI may include at least one of the following: two-level DCI The first level and the second level together constitute complete scheduling information; The second level of the two-level DCI contains complete scheduling information.
  • the terminal demodulates the slow DCI and skips to the next subframe to continue detecting the slow DCI without Detect the fast DCI in this sub-frame.
  • the terminal demodulates the slow DCI and continues to detect the fast DCI in this subframe.
  • both the first-level and second-level DCIs contain resource allocation information and the second-level resource allocation is based on the first-level resource allocation.
  • both the first-level DCI and the second-level DCI contain resource allocation information and the second-level resource allocation does not depend on the first-level resource allocation.
  • the first-level DCI includes the detection information required to indicate the second-level DCI to reduce the second-level DCI detection complexity, but even if the first-level DCI is not detected, the terminal can still detect the parameters according to the high-level signaling RRC or SIB configuration. Second level DCI.
  • one of the above two methods may be used by the base station (eNB) through the high layer signaling RRC or SIB notification or one of the above two methods may be predefined.
  • At least one of the following information may be included in the first level DCI:
  • Determining a parameter required for sPDCCH detection of a second-level DCI where the second-level DCI includes a second-level DCI that schedules sPDSCH and/or sPUSCH, where the parameter may include an aggregation level, a number of candidate sets, and a search space frequency domain. At least one of a location, a search space time domain location, an sPDCCH scrambling parameter, a DMRS scrambling parameter used by the sPDCCH, an sPDCCH transmission mode, and a DMRS port used for sPDCCH demodulation;
  • the reserved RE is preferably an RE corresponding to all the DMRS ports, or an RE corresponding to the port occupying the same RE;
  • DL downlink
  • UL uplink
  • the first-level DCI indicates a parameter required for detecting sPDCCH of the second-level DCI, indicating a subset of parameters of the RRC or SIB configuration based on parameters of the RRC or SIB configuration.
  • the subset may include a subset of the parameter categories, and/or a subset of the parameter value ranges.
  • the second level DCI may include at least one of the following information:
  • the second level DCI includes resource allocation and is indicated on the basis of resource allocation in the first level DCI;
  • the second-level DCI includes resource allocation
  • the reserved RE is preferably the RE corresponding to all the DMRS ports, or the RE corresponding to the port occupying the same RE;
  • an update period of the first-level DCI in the two-level DCI may be configured by a high-level signaling SIB or RRC. This method can be applied to the case where the fast DCI has complete scheduling information. When a slow DCI demodulation error occurs, but is still within the update period range, the previous slow DCI indication is used to reduce the fast DCI demodulation complexity.
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used secondly;
  • the sPDSCH port is indicated by the DCI in combination with the sPDCCH transmission mode.
  • the sPDSCH port may be not indicated when the sPDSCH is used in the DCI, or the same port as the RE where the sPDCCH is used by the sPDCCH, and the sPDCCH uses port x1, sPDSCH. Also use port x1, or use port x2 with the same RE location as port x1.
  • the sPDSCH layer 2 transmission may not indicate, and the corresponding port is used according to the sPDCCH transmission mode.
  • the sPDSCH uses the port x1 and x2 of the same RE position as the port x1, and the port x1 and y1 are used when the sPDCCH transmission mode is used.
  • the sPDSCH uses port x1, x2 of the same RE location as port x1, or port y1, y2 of the same RE location as port y1, or uses port x1, y1 (preferred), or indicates a port corresponding to the sPDCCH transmission mode
  • the sPDSCH is instructed to use the ports x1 and x2 of the same RE position as the port x1, and when the sPDCCH transmission mode uses the ports x1 and y1, the sPDSCH uses the port x1, x2 of the same RE position as the port x1, or Port y1 port y1, y2 at the same RE position, or port x1, y1 (preferred).
  • the sPDSCH uses more than Layer 2 transmission, it may not indicate that the corresponding port is used according to the transmission mode.
  • the sPDCCH transmission mode uses port x1
  • the sPDSCH uses the same RE location as the port x1.
  • Port x1, x2, x3, ... when port x1, y1 is used for the sPDCCH transmission mode, sPDSCH uses port x1, x2, x3, ... of the same RE position as port x1, or port y1, y2 of the same RE position as port y1 Y3..., or use port x1, y1, x2, y2, ... (preferred), or port x1, x2, x3, ...
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used next.
  • the DMRS resource location may adopt different occupation manners according to whether the sPDCCH and the sPDSCH share the DMRS.
  • the possible DMRS resource occupation manner is as follows.
  • the partial PRB is located in the PRB where the sPDCCH is located, at least in the PRB where the sPDCCH is located, and is located in the PRB resource occupied by the sPDCCH or the sPDSCH.
  • the selected PRB is medium; if the sPDCCH and the sPDSCH do not share the DMRS, the DMRS resource occupation mode may be equal to the PRB selected by each PRB and located at the middle interval of the PRB resources occupied by the sPDSCH.
  • the DMRS frequency domain location shared by the sPDCCH and the sPDSCH is located in a part of the PRB, at least one of the following occupation modes is included:
  • the PRB is located in the PRB of the intermediate interval of the PDCCH occupied by the sPDCCH or the sPDSCH.
  • the max ⁇ sPDCCH occupies the PRB resource
  • the sPDSCH occupies the PRB resource ⁇ .
  • the scrambling initialization method of the sPDCCH is that each sTTI in the subframe or the radio frame is independently scrambled, wherein the sPDCCH scrambling initialization in the first sTTI or the legacy PDCCH region in the subframe satisfies c init is the scrambling initialization value, n s is the slot number, It is the identification (ID) number of the cell.
  • another downlink control information transmission device is further provided, which is located in the UE, and the device is used to implement the foregoing embodiment and the preferred embodiment, and has been performed. The description will not be repeated.
  • FIG. 5 is a structural block diagram of another apparatus for transmitting downlink control information according to an embodiment of the present disclosure. As shown in FIG. 5, the apparatus includes:
  • the receiving module 42 is configured to receive downlink control information of a UE for scheduling a short transmission time interval (sTTI) carried by at least one of a legacy physical downlink control channel (legacy PDCCH), an enhanced physical downlink control channel (ePDCCH), and an sPDCCH. (DCI), the sPDCCH is a physical downlink control channel in the sTTI, and the scheduling module 44 is configured to perform scheduling by using the DCI received by the receiving module 42.
  • sTTI short transmission time interval
  • legacy PDCCH legacy physical downlink control channel
  • ePDCCH enhanced physical downlink control channel
  • sPDCCH sPDCCH
  • DCI sPDCCH
  • the scheduling module 44 is configured to perform scheduling by using the DCI received by the receiving module 42.
  • the traffic channel used by the DCI for scheduling includes at least one of the following: : only the traffic channel in the sTTI; the traffic channel in the sTTI or the traffic channel in the 1 ms TTI; the traffic channel in the sTTI and the traffic channel in the 1 ms TTI.
  • the apparatus may further include an obtaining module, configured to obtain, by using the high layer signaling RRC or the SIB, one of the foregoing two methods or one of the foregoing two methods.
  • an obtaining module configured to obtain, by using the high layer signaling RRC or the SIB, one of the foregoing two methods or one of the foregoing two methods.
  • the acquiring module may be further configured to acquire an update period of the first-level DCI in the two-level DCI configured by the high-layer signaling SIB or RRC.
  • This method can be applied to the case where the fast DCI has complete scheduling information.
  • the previous slow DCI indication is used to reduce the fast DCI demodulation complexity.
  • the apparatus may further include a port selection module configured to select to use a corresponding sPDSCH port according to a port usage principle.
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used secondly;
  • the sPDSCH port is indicated by the DCI in combination with the sPDCCH transmission mode.
  • the sPDSCH port may be not indicated when the sPDSCH is used in the DCI, or the same port as the RE where the sPDCCH is used by the sPDCCH, and the sPDCCH uses port x1, sPDSCH. Also use port x1, or use port x2 with the same RE location as port x1.
  • the sPDSCH layer 2 transmission may not indicate, and the corresponding port is used according to the sPDCCH transmission mode.
  • the sPDSCH uses the port x1 and x2 of the same RE position as the port x1, and the port x1 and y1 are used when the sPDCCH transmission mode is used.
  • the sPDSCH uses port x1, x2 of the same RE location as port x1, or port y1, y2 of the same RE location as port y1, or uses port x1, y1 (preferred), or indicates a port corresponding to the sPDCCH transmission mode
  • the sPDSCH is instructed to use the ports x1 and x2 of the same RE position as the port x1, and when the sPDCCH transmission mode uses the ports x1 and y1, the sPDSCH uses the port x1, x2 of the same RE position as the port x1, or Port y1 port y1, y2 at the same RE position, or port x1, y1 (preferred).
  • the sPDSCH uses more than Layer 2 transmission, it may not indicate that the corresponding port is used according to the transmission mode.
  • the sPDCCH transmission mode uses port x1
  • the sPDSCH uses the port x1, x2, x3, ... of the same RE position as the port x1, when the sPDCCH is transmitted.
  • port x1 and y1 are used, sPDSCH uses port x1, x2, x3, ... at the same RE position as port x1, or port y1, y2, y3, ... at the same RE position as port y1, or uses port x1, y1, x2.
  • the sPDSCH uses the same RE position as the port x1, and when the sPDCCH transmission mode uses the ports x1, y1, the sPDSCH uses the port x1, x2 of the same RE position as the port x1 , x3..., or port y1, y2, y3... at the same RE position as port y1, or using ports x1, y1, x2, y2, ... (preferred);
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used next.
  • the apparatus may further include a scrambling module configured to scramble the sPDCCH.
  • the scrambling initialization method of the sPDCCH is that each sTTI in the subframe or the radio frame is independently scrambled, wherein the sPDCCH scrambling initialization in the first sTTI or the legacy PDCCH region in the subframe satisfies c init is the scrambling initialization value, n s is the slot number, It is the identification (ID) number of the cell.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination.
  • the forms are located in different processors.
  • FIG. 6 is a structural block diagram of a transmission system for downlink control information according to an embodiment of the present disclosure. As shown in FIG. 6, the device includes the same as shown in FIG. The transmission device 30 located in the downlink control information of the base station further includes a transmission device 40 located in the downlink control information of the UE as shown in FIG. 5.
  • the problem of designing downlink control information in short TTIs with fewer OFDM symbols can be solved, short TTI scheduling and scheduling services of different lengths of TTIs are supported, and low-latency communication requirements are ensured. .
  • a downlink control information transmission scheme is provided: the base station carries the downlink control information of the scheduled sTTI UE by using at least one of the legacy PDCCH and the sPDCCH, and sends the downlink control information to the terminal.
  • the traffic channel scheduled by the downlink control information includes at least one of the following:
  • It is used to schedule the traffic channel in the sTTI and the traffic channel in the 1ms TTI.
  • the Legacy PDCCH is a physical downlink control channel in the LTE system, and includes a PDCCH, an ePDCCH, an rPDCCH, and the like.
  • the sPDCCH indicates a physical downlink control channel in the sTTI, which may be simply referred to as a sPDCCH (Short PDCCH), and similarly, a physical downlink traffic channel in the sTTI. It can be abbreviated as sPDSCH (Short PDSCH), and the physical uplink traffic channel in sTTI can be simply referred to as sPUSCH (Short PUSCH).
  • the sTTI is a TTI that is less than 1 ms in time.
  • the short TTI is composed of N OFDM symbols, and the number N of OFDM symbols included is ⁇ 1, 2, 3, 4, 5, 6, 7 ⁇ . At least one of them.
  • the sTTI includes N OFDM symbols
  • the sPDCCH occupies X OFDM symbols in the time domain, X ⁇ N, and X preferably takes a value of 1 or 2.
  • X OFDM symbols are located in the first X OFDM symbols among the N OFDM symbols of the sTTI.
  • the value of X can be fixed or configured by the base station.
  • the sPDCCH is located in a subframe or a partial resource position in an OFDM symbol or an OFDM symbol, and the partial resource is a partial PRB or REG resource in one or more OFDM symbols in a subframe or an sTTI, or a partial resource is a partial PRB or REG resource in the OFDM symbol.
  • the resource unit in the frequency domain may also use the PRB aggregation and use or configure the N PRBs as a group; similar REGs may also be used for aggregation.
  • the downlink control information includes at least one of a legacy DCI in the LTE system and a newly designed sTTI DCI in the sTTI UE.
  • the legacy PDCCH carries the 1 ms TTI traffic channel of the legacy DCI scheduling sTTI UE, and the legacy channel is carried by the legacy PDCCH or the sPDCCH carrying the sTTI DCI; the downlink control information is used for The traffic channel in the sTTI or the traffic channel in the 1 ms TTI is scheduled by the Legacy PDCCH or the sPDCCH carrying the sTTI DCI when the traffic channel in the sTTI or the traffic channel in the 1 ms TTI is scheduled.
  • the downlink control information is used to schedule the traffic channel in the sTTI and the traffic in the 1 ms TTI.
  • the Legacy DCI carries the 1 ms TTI traffic channel of the sTTI UE, and the sPDCCH carries the sTTI DCI to schedule the traffic channel in the sTTI;
  • the indication bit field is used to distinguish whether the service channel in the 1 ms TTI is scheduled. Traffic channel in sTTI.
  • the sTTI DCI includes a function of scheduling sTTI or 1 ms TTI.
  • whether the 1ms TTI or the sTTI traffic channel is scheduled is indicated by the sTTI/TTI flag bit field.
  • the sPDCCH is used to carry the sTTI DCI and simultaneously supports 1 ms TTI and sTTI dynamic scheduling.
  • the sTTI/TTI flag is useless in the non-first sTTI in the subframe, or the sTTI/TTI flag is used to indicate other functions in the non-first sTTI.
  • the first-level DCI (also referred to as a slow DCI) indicates whether to schedule a 1 ms TTI or an sTTI traffic channel by using the sTTI/TTI flag, and may be a legacy PDCCH or an sPDCCH bearer for the slow DCI.
  • the sTTI extracted per subframe scheduling information may include DL and/or UL scheduling information, such as the sTTI band resource allocation (the resource allocation refers to the resource indication on the frequency domain, preferably indicating the system bandwidth) Which PRB resources are occupied) may be DL sTTI band resource allocation and/or UL sTTI band resource allocation, sTTI length may be DL sTTI length and/or UL sTTI length, fast DCI resource indication (fast DCI resource indication refers to sPDCCH carrying fast DCI) The parameter indication required for detection) may be a DL fast DCI resource indication and/or a UL fast DCI resource indication.
  • the sTTI band resource allocation the resource allocation refers to the resource indication on the frequency domain, preferably indicating the system bandwidth
  • which PRB resources are occupied may be DL sTTI band resource allocation and/or UL sTTI band resource allocation
  • sTTI length may be DL sTTI length and/or UL s
  • the DCI when the DCI is used to schedule a traffic channel in a sTTI or a traffic channel in a 1 ms TTI, whether the service channel in the 1 ms TTI is scheduled by using the indication bit field in the first level of the first-level DCI or the two-level DCI Traffic channel in sTTI.
  • the identifier bit field is not only 1 bit indicating 1 ms TTI and sTTI, but also 2 bits indicating sTTI of different granularity, such as using 2 bits.
  • the size of the DCI of the UE for scheduling the sTTI is the same as the size of the DCI for scheduling the 1 ms PDSCH, and is distinguished by the RNTI, including distinguishing by different values of different types of RNTIs. Or distinguish by different values of the same type of RNTI.
  • the different scrambling code RNTI of the first-level DCI of the first-level DCI or the two-level DCI may be used to distinguish whether the DCI is used for scheduling a traffic channel in a 1 ms TTI or for scheduling a traffic channel in an sTTI.
  • it may be used to schedule only the traffic channel in the sTTI; or to schedule a traffic channel in the sTTI or a traffic channel in the 1 ms TTI; or to schedule a traffic channel in the sTTI and a traffic channel in the 1 ms TTI.
  • the DCI of the UE for scheduling the sTTI and the DCI for scheduling the 1 ms PDSCH are located in different search spaces. It can be distinguished by restricting the search space in which the DCIs of different service channels are scheduled, for example, respectively located in CSS or USS, respectively in the Legacy search space and the newly defined search space. Preferably, it can be used to schedule only the traffic channel in the sTTI; schedule the traffic channel in the sTTI or the traffic channel in the 1 ms TTI; schedule the traffic channel in the sTTI and the traffic channel in the 1 ms TTI.
  • the method is preferably used to schedule a traffic channel in an sTTI or a traffic channel in a 1 ms TTI.
  • the message carried by the traffic channel in the 1 ms TTI may include at least one of the following: a UE unicast message, or a cell broadcast message, or a common message of a group of UEs, or a system change of a cell level or a group of UEs.
  • Message notification information may include at least one of the following: a UE unicast message, or a cell broadcast message, or a common message of a group of UEs, or a system change of a cell level or a group of UEs.
  • the downlink control information is a first-level DCI or a two-level DCI, where the traffic channel scheduling information indicated by the two-level DCI includes at least one of the following:
  • the second level of the two-level DCI includes complete scheduling information.
  • the first level optionally includes but is not limited to at least one of the following: partial scheduling information, indication information of the second-level DCI, frequency domain range of the sTTI, and downlink.
  • DL length of sTTI
  • UL uplink
  • DL sTTI length of uplink
  • the terminal demodulates the slow DCI and skips to the next subframe to continue detecting the slow DCI without Detect the fast DCI in this sub-frame.
  • the terminal demodulates the slow DCI and continues to detect the fast DCI in this subframe.
  • both the first-level and second-level DCIs contain resource allocation information and the second-level resource allocation is based on the first-level resource allocation.
  • both the first-level DCI and the second-level DCI contain resource allocation information and the second-level resource allocation does not depend on the first-level resource allocation.
  • the first-level DCI includes the detection information required to indicate the second-level DCI to reduce the second-level DCI detection complexity, but even if the first-level DCI is not detected, the terminal can still detect the parameters according to the high-level signaling RRC or SIB configuration. Second level DCI.
  • one of the above two methods may be used by the base station (eNB) through the high layer signaling RRC or SIB notification or one of the above two methods may be predefined.
  • each DCI can independently schedule the corresponding traffic channel, and has complete scheduling information. In the case that no base station configuration detects the sTTI time, the default is required in each sTTI.
  • the DCI is detected.
  • the two-stage DCI indicates that the traffic channel scheduling information is that the first level and the second level of the two-level DCI form a complete scheduling information, and the terminal needs to obtain the information in the two-level DCI to obtain the service.
  • Channel scheduling information is the downlink control information is the first-level DCI.
  • the two-stage DCI indicates that the traffic channel scheduling information is that the second level of the two-level DCI includes complete scheduling information, and the terminal needs to obtain only The information in the second-level DCI can obtain the scheduling information of the traffic channel.
  • the information in the first-level DCI is the information that assists the second-level DCI detection or the dynamic configuration information of other physical layers.
  • the second-level DCI is also called fast DCI.
  • the first level DCI includes at least one of the following information:
  • the partial polymerization level in the rank is preferably one.
  • the number of candidate sets indicated is a partial candidate set of all candidate sets corresponding to each aggregation level, preferably one.
  • the indicated search space frequency domain location is part of the RBG or PRB or REG location in the system bandwidth or sTTI band.
  • the indicated search space time domain location is a partial OFDM symbol position in a subframe or in an sTTI. Instructing the sPDCCH scrambling initial value parameter to be UE-specific Or group-specific There is no need to indicate the use of a cell ID for public messages. Indicates that the DMRS scrambling initial value parameter used by the sPDCCH is UE-specific Or group-specific There is no need to indicate the use of a cell ID for public messages.
  • the sPDCCH transmission mode is indicated to be at least one of a centralized transmission, a distributed transmission, and a transmit diversity transmission.
  • Indicates the DMRS port used for sPDCCH demodulation that is, the DMRS port number used by the eNB to directly indicate the second-level DCI demodulation through the first-stage DCI, or indicates the port number combination used.
  • the first-level DCI indicates the DMRS port when the sPDCCH and/or the sPDSCH rate of the second-level DCI is matched, so that the sPDCCH carrying the second-level DCI is used.
  • the sPDSCH can know the DMRS pilot that does not need to be demodulated but exists in the rate matching in the frequency domain overlapping region, so that the eNB and the terminal match at the rate. Understand the same.
  • the first-stage DCI indicates that the sPDCCH and/or sPDSCH demodulation using the second-level DCI uses the pilot as a CRS or DMRS, or both CRS and DMRS.
  • the first-level DCI indicates an sPDSCH transmission mode in the subframe.
  • the first-level DCI indicates whether the sPDCCH and/or the sPDSCH carrying the second-level DCI is used based on CRS demodulation.
  • the first-level DCI indicates whether the sPDCCH and/or the sPDSCH carrying the second-level DCI is used based on the DMRS demodulation.
  • the first-level DCI indicates the PRB location of the DMRS used when the sPDCCH and/or sPDSCH carrying the second-level DCI is demodulated.
  • the sPDCCH and or sPDSCH related parameters for non UE-specific are indicated.
  • the sPDCCH and or sPDSCH related parameters for UE-specific are indicated.
  • the first-level DCI indicates a parameter required for detecting the sPDCCH of the second-level DCI, indicating the RRC or SIB configuration based on the parameters of the RRC or SIB configuration.
  • the subset may include a subset of the parameter categories, and/or a subset of the parameter value ranges.
  • parameters required for sPDCCH detection of the second-level DCI are still configured by higher layer signaling (SIB or RRC signaling), where the parameters include an aggregation level, a number of candidate sets, a search space frequency domain location, and a search space time domain.
  • the configured search space time domain location indicates a reduced or specific time domain location.
  • the second level DCI includes at least one of the following information:
  • the second-level DCI includes the resource allocation and is indicated on the basis of the resource allocation in the first-level DCI; specifically, the sTTI frequency domain in the current subframe indicated by the first-level DCI
  • the second-level DCI indicates that the UE supports all or part of the resources in the resource R allocated by the first-level DCI. For example, 3 bits are used to indicate that resources occupying ⁇ 1, 1/2, 1/4 ⁇ R, that is, 7 possibilities, wherein 1/2R and 1/4R can occupy occupied resources at equal intervals or at equal intervals.
  • the second level DCI includes resource allocation and is indicated on the basis of resource allocation in the first level DCI;
  • the second-level DCI includes resource allocation
  • the reserved RE is preferably the RE corresponding to all the DMRS ports, or the RE corresponding to the port occupying the same RE;
  • the second-level DCI indicates the DMRS port when the sPDSCH rate matches, so that the sPDSCH can know the DMRS that does not need to be demodulated but exists in the rate matching in the frequency domain overlapping area.
  • the pilots make the eNB and the terminal understand the consistency in rate matching.
  • the second-level DCI indicates the PRB location of the DMRS used when the sPDSCH is demodulated.
  • an update period of the first-level DCI (also referred to as a slow DCI) in the two-stage DCI is configured by higher layer signaling (SIB or RRC).
  • SIB higher layer signaling
  • the second-level DCI also called fast DCI
  • the previous slow DCI indication is used to lower the fast DCI demodulation complexity.
  • the update period is at least one of 1 ms, 4 ms, 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, 160 ms, 320 ms.
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used secondly;
  • the sPDSCH port may be indicated by the DCI in combination with the sPDCCH transmission mode.
  • the sPDSCH port may be used when the sPDSCH port is used in the DCI, or the same port as the RE where the sPDCCH is used, and the sPDCCH port is used.
  • X1, sPDSCH also uses port x1, or port x2 with the same RE position as port x1.
  • the sPDSCH layer 2 transmission may not indicate, and the corresponding port is used according to the sPDCCH transmission mode.
  • the sPDSCH uses the port x1 and x2 of the same RE position as the port x1, and the port x1 and y1 are used when the sPDCCH transmission mode is used.
  • the sPDSCH uses port x1, x2 of the same RE location as port x1, or port y1, y2 of the same RE location as port y1, or uses port x1, y1 (preferred), or indicates a port corresponding to the sPDCCH transmission mode
  • the sPDSCH is instructed to use the ports x1 and x2 of the same RE position as the port x1, and when the sPDCCH transmission mode uses the ports x1 and y1, the sPDSCH uses the port x1, x2 of the same RE position as the port x1, or Port y1 port y1, y2 at the same RE position, or port x1, y1 (preferred).
  • the sPDSCH uses more than Layer 2 transmission, it may not indicate that the corresponding port is used according to the transmission mode.
  • the sPDCCH transmission mode uses port x1
  • the sPDSCH uses the port x1, x2, x3, ... of the same RE position as the port x1, when the sPDCCH is transmitted.
  • port x1 and y1 are used, sPDSCH uses port x1, x2, x3, ... at the same RE position as port x1, or port y1, y2, y3, ... at the same RE position as port y1, or uses port x1, y1, x2.
  • the sPDSCH uses the same RE position as the port x1, and when the sPDCCH transmission mode uses the ports x1, y1, the sPDSCH uses the port x1, x2 of the same RE position as the port x1 , x3..., or port y1, y2, y3... at the same RE position as port y1, or using ports x1, y1, x2, y2, ... (preferred);
  • the sPDCCH uses a DMRS port similar to ePDCCH.
  • FIG. 7 is a schematic diagram of an sPDCCH occupying resources only in a portion of an sPRB in a first OFDM symbol in an sTTI according to a preferred embodiment of the present disclosure. As shown in FIG. 7, the sPDCCH is only occupied in a portion of the sPRB in the first OFDM symbol in the sTTI. Resources. It is assumed that PRB#48-49 and 36-37 are occupied by sPDCCH1, and the scheduled sPDSCH1 is located at PRB#44-49, 32-37.
  • FIG. 8 is a schematic diagram of a DMRS in a PRB where an sPDCCH is located in need of sharing with an sPDSCH according to a preferred embodiment of the present disclosure
  • FIG. 9 is a schematic diagram of a part of a PRB in which a sPDSCH is located without sharing a DMRS with an sPDCCH according to a preferred embodiment of the present disclosure.
  • DMRS in PRB #48-49, 36-37 shown in 8 may need to be shared with sPDSCH (used in sPDSCH)
  • the CRS or sPDSCH does not need to be shared when using the exclusive DMRS.
  • the DMRSs in the PRBs #44-47 and 32-35 (if the sPDSCH uses the DMRS) need not be shared with the sPDCCH.
  • Sharing means that two channels need to use DMRS at the same RE location in CDM mode.
  • the sPDCCH and the sPDSCH each use an independent DMRS RE, which makes the pilot overhead in the sTTI larger.
  • sPDSCH When sPDCCH is centralized, such as port7, sPDSCH also uses centralized port7.
  • sPDCCH uses distributed time port 7/9, sPDSCH also uses port7/9;
  • the sPDSCH layer is the same as the sPDCCH port7, and the port used by the other layer is recommended to select the port 8 of the same RE location;
  • sPDCCH When sPDCCH is distributed, such as port7/9, the two layers of sPDSCH use port7 and port9 respectively;
  • the sPDSCH layer is the same as the sPDCCH port7, and the port used by the other layer is recommended to preferentially select ports 8, 11, and 13 of the same RE location, and then select ports 9, 10, and 12 of different RE locations. 14;
  • the port of the sPDSCH can be flexibly selected.
  • the use of ports for PDSCH may introduce restrictions when RI > 2.
  • the principle is to consider the overhead first, and try to make the DMRS overhead of the sPDSCH not increase based on the DMRS cost used by the sPDCCH when the RI requirement is met. When the RI requires, the resource location that increases the DMRS overhead is selected.
  • the sPDSCH port usage principle includes at least one of the following:
  • the port with the same RE location as the DMRS of the sPDCCH is preferentially used, and the port with the RE location of the DMRS of the sPDCCH is used secondly;
  • the sPDCCH uses the DMRS port 7
  • the sPDSCH preferentially uses the DMRS ports 8, 11, and 13, and the sub-optimal uses the DMRS ports 9, 10, 12, and 14.
  • the method includes at least one of the following manners:
  • the DMRS of the UE is configured only from the PRB including the sPDCCH, and the demodulation performance for the sPDSCH may be deteriorated at this time.
  • the sPDCCH is preferably distributed in the PRB occupied by the sPDSCH, so that the DMRS is dispersed in the frequency domain as much as possible.
  • the DMRS of the UE is also configured in the PRB of the PRB where the sPDSCH is located, except for the DMRS in which the PDCCH is located in the PRB.
  • the PRB is located in the PRB of the intermediate interval of the PDCCH occupied by the sPDCCH or the sPDSCH.
  • the max ⁇ sPDCCH occupies the PRB resource
  • the sPDSCH occupies the PRB resource ⁇ .
  • the interval is x PRBs, where x is a fixed value or a value configured by the eNB through higher layer signaling or physical layer signaling.
  • the PRB location where the DMRS is located may also be indicated by higher layer signaling or physical layer signaling.
  • the scrambling initialization method of the sPDCCH is the same as the legacy PDCCH scrambling in the first sTTI in the subframe, and the subsequent sTTI in the subframe is different from the legacy PDCCH scrambling.
  • the initial value determining manner used by the scrambling sequence includes at least one of the following. It should be noted that the following methods (1), (2), and (3) only take the sTTI as two OFDM symbols and the normal CP as an example, and the sTTI number in the subframe is 0 to 6. Also suitable for short TTIs of other lengths. If the sTTI is 7 OFDM symbols, the sTTI sequence number in the subframe is 0 to 1. If the sTTI is 4-3-4-3 OFDM symbols, the sTTI sequence number in the subframe is 0 to 3. The c init in the following formula is the scrambling initialization value, and n s is the slot number. It is the identification (ID) number of the cell.
  • ID identification
  • n TTI 0, 1, ..., 6.
  • n TTI 0, 1, ..., 6.
  • the scrambling mode is better than the frame-based scrambling randomization method when the sTTI index can be accurately known, and the sPDCCH scrambling in the legacy PDCCH region in the subframe is not added to the PDCCH. Interference conflicts, compatible after implementation.
  • the C-RNTI or the Group-RNTI is used instead.
  • This preferred embodiment 1 implements scheduling PDSCH or sPDSCH through two-level DCI
  • the base station schedules the sPDSCH through two-stage DCI.
  • the first-level DCI optionally includes a frequency domain occupied position indicating an sTTI band, and optionally includes an indication sTTI length/pattern.
  • the first-level DCI can flexibly schedule 1ms PDSCH and sTTI sPDSCH for the sTTI UE.
  • the indication of 1 ms TTI and sTTI scheduling identity is included in the first level of DCI.
  • the first-level DCI is located in the Legacy PDCCH region, or is in the first sTTI, and is carried by the Legacy PDCCH or the sPDCCH.
  • the first-level DCI (slow DCI) content is exemplified in Table 1, and the downlink traffic channel is scheduled as an example.
  • the base station schedules the sPDSCH in the sTTI
  • the sPDCCH carrying the second-level DCI (fast DCI) is transmitted in the sTTI.
  • the fast DCI content is exemplified in Table 2, and the downlink traffic channel is scheduled as an example.
  • the resource allocation 3 bits indicates that the resources occupying ⁇ 1, 1/2, 1/4 ⁇ R, that is, 7 kinds of possibilities, wherein R/2 and R/4 can occupy the resources or occupy the resources at equal intervals.
  • the two types corresponding to R/2 may be a group of even numbers of 16 parts, an odd numbered group; the four types corresponding to R/4 may be 16 parts of the number ⁇ 0, A group of 4, 8, 12 ⁇ , a group of numbers ⁇ 1, 5, 9, 13 ⁇ , a group of numbers ⁇ 2, 6, 10, 14 ⁇ , one of numbers ⁇ 3, 7, 11, 15 ⁇ group.
  • the terminal When receiving the downlink service data, the terminal first demodulates the slow DCI in the Legacy PDCCH region. When demodulating and determining that the PDSCH is scheduled according to the flag, the terminal no longer receives the detected fast DCI, and receives the PDSCH in the detection subframe according to the scheduling information. When it is determined by the flag that the sTTI sPDSCH is scheduled according to the flag, the fast DCI carried in the sPDCCH is continuously detected in the sTTI.
  • the sPDSCH is demodulated in the sTTI according to the information of the scheduled sPDSCH in the demodulation fast DCI.
  • the first-level DCI in the two-level DCI is added to distinguish the 1ms TTI or the sTTI flag identifier, so that the sTTI terminal performs only one TTI length service channel demodulation in the same subframe, without At the same time, PDSCHs of different TTI lengths are demodulated to reduce the complexity of terminal detection processing. Guaranteed delay requirements.
  • Two-stage DCI is used in the preferred embodiment 2, and is used independently or independently to indicate fast DCI, transmission mode, pilot, etc.
  • the base station schedules the sPDSCH through two-stage DCI.
  • the first-level DCI includes a frequency domain occupied position indicating an sTTI band, optionally including an indication sTTI length/pattern, optionally including an sPDSCH transmission mode, and optionally a demodulation pilot including sPDCCH and or sPDSCH.
  • the PRB location of the DMRS used by the sPDCCH and or the sPDSCH is optionally included, and optionally includes parameters required for fast DCI related detection.
  • the first-level DCI is located in the Legacy PDCCH region, or is in the first sTTI, and is carried by the Legacy PDCCH or the sPDCCH.
  • the content of the first-level DCI is exemplified in Table 3, and the downlink traffic channel is scheduled as an example.
  • the sPDSCH transmission indication may be indicated based on the existing LTE transmission mode (1-10), or may be indicated in the transmission mode set used by the sTTI UE, and the transmission mode set used by the sTTI UE may be only included in the LTE.
  • the demodulation pilot indication indicates whether the cell reference signal CRS or the UE demodulation reference signal DMRS is based.
  • the PRB location where the DMRS is located is only in the DMRS.
  • the Fast DCI detection parameter indication specifically includes an aggregation level, a number of candidate sets, a search space frequency domain location, a search space time domain location, an sPDCCH scrambling initial value parameter, a DMRS scrambling initial value parameter used by the sPDCCH, an sPDCCH transmission mode, and an sPDCCH demodulation. At least one of the DMRS ports used, or a subset of partial parameters (eg, a reduced value or a specific value), based on a higher layer signaling SIB or RRC configuration.
  • the base station schedules the sPDSCH in the sTTI, and transmits the sPDCCH carrying the second-level DCI (fast DCI) in the sTTI.
  • the fast DCI content is exemplified in Table 4, and the downlink traffic channel is scheduled as an example.
  • the second level DCI indicates further resource allocation, for example, 3 bits indicate that the resources occupying ⁇ 1, 1/2, 1/4 ⁇ R, that is, 7 possibilities, where R/2 and R/4 can occupy resources at equal intervals or at discrete intervals.
  • the second-level DCI is specifically independent of the sPDSCH scheduling information, the resource allocation information of the sPDSCH is directly indicated in the second level.
  • the terminal When receiving the downlink service data, the terminal first demodulates the slow DCI in the Legacy PDCCH region. When the two-stage DCI together constitutes the complete scheduling information, the terminal demodulates the second-level DCI based on the demodulation of the first-level DCI. Complete sPDSCH demodulation indicator parameters. When the second-level DCI in the two-stage DCI includes complete sPDSCH scheduling information, demodulating the first-level DCI can make the demodulation of the second-level DCI faster and reduce the detection complexity. Otherwise, the second-level DCI detection is not demodulated. When the first-level DCI is obtained, it is detected with a high detection complexity. When the second-level DCI can independently carry the sPDSCH scheduling information, the first-level DCI may not be referred to as DCI, that is, one physical layer signaling, and the detection complexity of the DCI is reduced by the indication.
  • the sPDSCH is demodulated in the sTTI according to the information of the scheduled sPDSCH in the demodulation fast DCI.
  • the first-level DCI is added to indicate the second-level DCI-related detection information in the two-level DCI, so that the sTTI terminal obtains the scheduling information with a lower detection complexity when detecting the two-level DCI.
  • the sTTI terminal transmission is flexible based on the subframe level change by adding information indicating the transmission mode of the sPDCCH and or the sPDSCH, demodulation pilot, and the like in the first-stage DCI in the two-stage DCI. Guaranteed delay requirements.
  • Embodiments of the present disclosure also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • Step S102 The downlink control information (DCI) of the terminal (UE) for scheduling a short transmission time interval (sTTI) is carried by at least one of the legacy PDCCH, the ePDCCH, and the sPDCCH, where the legacy PDCCH and the ePDCCH are legacy in the LTE system.
  • PDCCH, ePDCCH, the sPDCCH is a physical downlink control channel in the sTTI;
  • Step S104 the bearer of the DCI is sent to the terminal.
  • the service channel in which the DCI is used for scheduling includes at least one of the following:
  • Traffic channel in sTTI and traffic channel in 1ms TTI are traffic channel in sTTI and traffic channel in 1ms TTI.
  • the storage medium is further arranged to store program code for performing the following steps:
  • Step S302 receiving downlink control information (DCI) of a terminal (UE) for scheduling a short transmission time interval (sTTI) carried by at least one of a legacy PDCCH, an ePDCCH, and an sPDCCH, where the legacy PDCCH and the ePDCCH are in an LTE system.
  • Legacy PDCCH, ePDCCH, the sPDCCH is a physical downlink control channel in the sTTI;
  • Step S304 the bearer of the DCI is sent to the terminal.
  • the service channel in which the DCI is used for scheduling includes at least one of the following:
  • Traffic channel in sTTI and traffic channel in 1ms TTI are traffic channel in sTTI and traffic channel in 1ms TTI.
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • modules or steps of the present disclosure described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. As such, the disclosure is not limited to any specific combination of hardware and software.
  • the method, device, and system for transmitting downlink control information provided by the embodiments of the present invention have the following beneficial effects: the downlink control lacking support for short TTI and related service scheduling in the low latency communication scenario in the related art is solved.
  • the problem of information, the implementation scheme supporting short TTI scheduling and its related different length TTI service scheduling is given to ensure the delay communication requirement.

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

Abstract

L'invention concerne, dans des modes de réalisation, un procédé, un dispositif et un système de transmission d'informations de commande de liaison descendante. Le procédé consiste en : le transport, au moyen d'un PDCCH patrimonial, et/ou d'un EPDCCH et/ou d'un sPDCCH, des DCI d'UE pour programmer un sTTI ; et l'envoi des DCI transportées à un terminal, les canaux de service devant être programmés par les DCI comprenant au moins l'un des éléments suivants : seulement les canaux de service dans le sTTI ; les canaux de service dans le sTTI ou les canaux de service dans un sTTI de 1 ms ; et les canaux de service dans le sTTI et les canaux de service dans un sTTI de 1 ms. Les modes de réalisation de la présente invention résolvent le problème de l'état de la technique selon lequel un manque de prise en charge pour un court sTTI et des informations de commande de liaison descendante de programmation de service associées existe dans des scénarios de communication à faible latence, et offrent des schémas de mise en œuvre pour prendre en charge une programmation de sTTI court et une programmation de service associée avec des longueurs de sTTI variables, ce qui garantit que les exigences de communication liées à la latence sont satisfaites.
PCT/CN2017/084279 2016-05-13 2017-05-15 Procédé, dispositif, et système de transmission d'informations de commande de liaison descendante WO2017194022A1 (fr)

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US10992502B2 (en) 2017-11-17 2021-04-27 Huawei Technologies Co., Ltd. Method for sending downlink control information, terminal device, and network device
WO2019095334A1 (fr) * 2017-11-17 2019-05-23 华为技术有限公司 Procédé d'envoi d'informations de commande de liaison descendante, dispositif terminal et dispositif réseau
WO2019095478A1 (fr) * 2017-11-17 2019-05-23 华为技术有限公司 Procédé d'envoi d'informations de commande de liaison descendante, dispositif terminal et dispositif réseau
CN110167181A (zh) * 2018-02-12 2019-08-23 北京三星通信技术研究有限公司 一种信号的传输方法和设备
US11889296B2 (en) 2018-02-12 2024-01-30 Samsung Electronics Co., Ltd. Method and apparatus for transmitting uplink information
US20210007139A1 (en) 2018-02-12 2021-01-07 Samsung Electronics Co., Ltd. Method and apparatus for transmitting uplink information
EP3767861A4 (fr) * 2018-03-13 2021-12-08 ZTE Corporation Procédé, appareil et dispositif d'envoi de canal de commande, procédé, appareil et dispositif de détection, et support de stockage
US11412500B2 (en) 2018-03-13 2022-08-09 Zte Corporation Method, apparatus and device for sending a control channel, method, apparatus and device for detecting a control channel, and storage medium
CN110278059A (zh) * 2018-03-13 2019-09-24 中兴通讯股份有限公司 控制信道发送、检测方法、装置及设备、存储介质
CN110475345A (zh) * 2018-05-10 2019-11-19 中兴通讯股份有限公司 数据传输的发送、接收方法及装置
CN114157397A (zh) * 2018-05-11 2022-03-08 维沃移动通信有限公司 确定下行控制信息的方法和设备
CN113424594A (zh) * 2019-02-15 2021-09-21 华为技术有限公司 一种信息发送方法及装置
US11368258B2 (en) 2019-03-28 2022-06-21 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Downlink data transmission method, terminal device, and storage medium
CN112688766A (zh) * 2019-10-17 2021-04-20 大唐移动通信设备有限公司 一种上行共享信道pusch的传输方法、装置及终端

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