Method and apparatus for determining control channel unit, and storage medium

Abstract

Embodiments of the present application provide a control channel unit determination method and device, and a storage medium, wherein the control channel unit determination method comprises: selecting part of resource unit groups in N resource unit groups to form a control channel unit, and forming a control channel unit by at least one of the following ways: for a physical downlink control channel (PDCCH) based on a demodulation reference signal (DMRS), when the mapping between a control channel unit (CCE) and a resource element group (REG) is distributed mapping, at least the following principle is satisfied: M REGs are equally spaced or discretely spaced in the frequency domain to form a CCE, wherein M is the number of REGs contained in K RBs in a transmission time interval, K is a positive integer, and N is a positive integer; for a PDCCH based on a cell reference signal (CRS), when the mapping between a CCE and a REG is distributed mapping, at least the following principle is satisfied: a group of REGs equally spaced or discretely spaced in the frequency domain form a CCE in a single symbol.

Description

[0001] This application is a divisional application of Chinese patent application No. 201711050997.1, filed on October 31, 2017, entitled “Method and apparatus for determining reference signal, control channel unit, and storage medium”. Technical Field

[0002] This invention relates to the field of communications, and more specifically, to a method and apparatus for determining control channel units, and a storage medium. Background Technology

[0003] Currently, the demands on fourth-generation mobile communication technology (4G) Long-Term Evolution (LTE) / Advanced Long-Term Evolution (LTE-Advanced / LTE-A) and fifth-generation mobile communication technology (5G) are increasing. From the current development trend, both 4G and 5G systems are researching features that support enhanced mobile broadband, ultra-high reliability, ultra-low latency transmission, and massive connectivity.

[0004] To support ultra-high reliability and ultra-low latency transmission, low-latency, high-reliability services need to be transmitted within short transmission intervals. Simultaneously, to meet high reliability requirements within specified latency constraints, or to transmit larger data packets within specified latency constraints, it is necessary to support the scheduling of multiple short transmission intervals. Multi-subframe scheduling is already supported in LTE / LTE-A systems, and this mechanism can be used for scheduling multiple short transmission intervals. However, if reference information is transmitted in each of the scheduled short transmission intervals, compared to multi-subframe scheduling, resource utilization will be reduced. Therefore, it is necessary to reduce reference signal overhead, but traditional subframe scheduling does not consider reducing pilot overhead.

[0005] In related technologies, the overhead of the reference signal is large due to the transmission of the reference signal in each short time interval, and no effective solution has yet been proposed. Summary of the Invention

[0006] This invention provides a method, apparatus, and storage medium for determining control channel units, to at least solve the problem in related technologies where the overhead of the reference signal is large due to the transmission of the reference signal in each short time interval.

[0007] According to one embodiment of the present invention, a method for determining a reference signal is provided, comprising:

[0008] The reference signal is indicated by a preset method in at least one of the N scheduled transmission time intervals (TTIs), where N is a positive integer.

[0009] Optionally, when the position of the reference signal is fixed in the TTI, a preset method is used to indicate that the reference signal exists in at least one of the N transmission time intervals (TTIs), including at least one of the following:

[0010] Method 1: In N transmission time intervals (TTIs), a reference signal exists only in the first TTI, and there is no reference signal in the remaining TTIs;

[0011] Method 2: The N TTIs of the instruction scheduling contain one TTI where the reference signal is located;

[0012] Method 3: Indicate whether each of the N TTIs in the schedule contains a reference signal;

[0013] Method 4: The N TTIs of the instruction schedule contain at most K TTIs where the reference signal is located, where K is a positive integer less than N;

[0014] Method 5: Indicate whether the reference signal is carried in any of the N TTIs except the first TTI and the location of the reference signal. The first TTI always has a reference signal. Indicate whether there is another TTI containing a reference signal and the location of the other TTI containing the reference signal.

[0015] Method Six: By indicating reference signal patterns in N TTIs, where,

[0016] The reference signal pattern is a set of patterns when scheduling the number of TTIs x.

[0017] Alternatively, the reference signal pattern may also carry information about the number of scheduled TTIs.

[0018] Alternatively, the reference signal pattern may simultaneously carry feedback acknowledgment (ACK) / non-acknowledgment (NACK) timing information.

[0019] Optionally, when two or more of the N TTIs contain reference signals, the reference signals are of the same type.

[0020] Optionally, when two or more of the N TTIs have reference signals, the reference signals are of the same type when the TTI types are different.

[0021] Optionally, the fifth method is implemented in one of the following ways:

[0022] Indicates the position of one TTI containing a reference signal among N TTIs, excluding the first TTI;

[0023] Use 1 bit to indicate whether there is another TTI containing a reference signal among the N TTIs, excluding the first TTI.

[0024] Optionally, the method further includes:

[0025] When another TTI contains a reference signal, the position of that TTI is fixed at the last of the N scheduled TTIs.

[0026] Optionally, during downlink transmission, supporting the use of unused resources of the Physical Downlink Shared Channel (PDSCH) by the Physical Downlink Control Channel (PDCCH) includes at least one of the following:

[0027] Of the N TTIs, only the first TTI supports PDSCH using resources not used by PDCCH;

[0028] When N>1, it is not supported for PDSCH to use resources not used by PDCCH;

[0029] When N=1, PDSCH is supported in using resources not used by PDCCH;

[0030] In N TTIs, all TTIs reuse the same unused PDCCH resources as the first TTI.

[0031] Optionally, the timing of the ACK / NACK feedback for the data carried in N TTIs is determined based on the position of the reference signal, and the determination method includes at least one of the following:

[0032] Method 1: When only one TTI out of multiple TTIs contains a reference signal, the timing of the feedback ACK / NACK when the reference signal is contained in the first TTI is k1, and the timing of the feedback ACK / NACK when the reference signal is contained in a non-first TTI is k2, then k1 is satisfied. <k2;

[0033] Method 2: When more than one TTI contains a reference signal, the timing of the feedback ACK / NACK when the last TTI contains a reference signal is k3, and the timing of the feedback ACK / NACK when the last TTI does not contain a reference signal is k4, then k3>k4 is satisfied.

[0034] Among them, k1, k2, k3, and k4 are all positive numbers.

[0035] Optionally, when the position of the reference signal is not fixed within a TTI, a preset method is used to indicate that a reference signal exists in at least one TTI out of N transmission time intervals (TTIs), and the position of the reference signal is not fixed within the TTI, including at least one of the following:

[0036] Method 1: By indicating the reference signal pattern of the first TTI among N TTIs, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0037] Method 2: By indicating one TTI out of N TTIs and the reference signal pattern in that TTI, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0038] Method 3: By indicating the reference signal pattern of at most K TTIs out of N TTIs, where the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling, and K is a positive integer less than N;

[0039] Method 4: By indicating the reference signal pattern for each of the N TTIs, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0040] Method 5: Indicate whether the reference signal is carried in any of the N TTIs except the first TTI and the location of the reference signal. The first TTI always has a reference signal. Indicate whether there is another TTI containing a reference signal and the location of the other TTI containing the reference signal, and indicate the location of the reference signal in that TTI.

[0041] Method Six: By indicating reference signal patterns in N TTIs, where,

[0042] The reference signal pattern is a set of patterns when scheduling the number of TTIs x.

[0043] Alternatively, the reference signal pattern may also carry information about the number of scheduled TTIs.

[0044] Alternatively, the reference signal pattern may simultaneously carry feedback ACK / NACK timing information;

[0045] The position of the reference signal is fixed in the TTI.

[0046] Optionally, when two or more of the N TTIs contain reference signals, the reference signals are of the same type.

[0047] Optionally, when two or more of the N TTIs have reference signals, the reference signals are of the same type when the TTI types are different.

[0048] Optionally, the fifth method is implemented in one of the following ways:

[0049] Indicates the position of one transmission time interval containing a reference signal among N transmission time intervals, excluding the first transmission time interval, and indicates the position of the reference signal in that transmission time interval;

[0050] Indicates whether there is another transmission time interval besides the first transmission time interval that contains the reference signal, and indicates the position of the reference signal in that transmission time interval.

[0051] Optionally, the method further includes:

[0052] When another TTI contains a reference signal, the position of that TTI is fixed at the last of the N scheduled TTIs.

[0053] According to another embodiment of the present invention, a method for determining a reference signal is also provided, comprising:

[0054] A reference signal is determined by a preset method in which at least one of the N transmission time intervals in SPS transmission exists, where N is a positive integer.

[0055] Optionally, the time-domain position of the reference signal is fixed during the transmission time interval, and the preset method includes at least one of the following:

[0056] Method 1: Predefined that in every N transmission time intervals, the reference signal is only present in the first transmission time interval;

[0057] Method 2: Indicate whether to reduce the reference signal density in every N transmission time intervals via signaling. Here, not reducing the reference signal density means that all N transmission time intervals contain the reference signal, and reducing the reference signal density means that the reference signal is contained in less than N transmission time intervals.

[0058] Method 3: Indicate the reference signal pattern in every N transmission time intervals via signaling.

[0059] Optionally, the reference signal density is reduced by at least one of the following methods: the reference signal is present only in the first transmission time interval; the reference signal is present only in the first and last transmission time intervals; the reference signal is present only in the first and transmission time intervals offset x from the first, where x is an integer taken from the set [0, N].

[0060] Optionally, the time-domain position of the reference signal is not fixed during the transmission time interval, and the preset method includes at least one of the following:

[0061] Method 1: Predefined that each of the N transmission time intervals contains a reference signal;

[0062] Method 2: Predefined that in every N transmission time intervals, the reference signal is only present in the first transmission time interval;

[0063] Method 3: Indicate whether to reduce the reference signal density in every N transmission time intervals via signaling. Here, not reducing the reference signal density means that all N transmission time intervals contain the reference signal, and reducing the reference signal density means that the reference signal is contained in less than N transmission time intervals.

[0064] Method 4: Indicate the reference signal pattern in every N transmission time intervals via signaling.

[0065] Optionally, in every N transmission time intervals, the first OFDM symbol in the transmission time interval containing the reference signal contains the reference signal.

[0066] Optionally, the reference signal density is reduced by at least one of the following methods: the reference signal is present only in the first transmission time interval; the reference signal is present only in the first and last transmission time intervals; the reference signal is present only in the first and transmission time intervals offset x from the first, where x is an integer taken from the set [0, N].

[0067] Optionally, the transmission time interval in which the first service transmission activating SPS transmission occurs contains a reference signal.

[0068] Optionally, when the signaling is physical layer signaling, it is only valid for a period of 1 transmission time interval, and all bits corresponding to the signaling are set to 0 for SPS transmission activation confirmation or deactivation confirmation in other periods; or it has different meanings for a period of 1 transmission time interval and other periods respectively, wherein it is valid for a period of 1 transmission time interval and is used for reference signal indication in every N transmission time intervals, and is used for reference signal indication in a single transmission time interval in other periods.

[0069] Optionally, the method is applied to semi-static scheduling (SPS) where the SPS period is one transmission time interval.

[0070] According to another embodiment of the present invention, a method for determining the transmission time of a semi-static scheduling (SPS) transmission is also provided, comprising:

[0071] The SPS period, offset value, and transmission time interval length are jointly encoded by higher-layer signaling, wherein the transmission time interval length is jointly encoded with the SPS period and offset value; or the SPS period and offset value are indicated by higher-layer signaling, while the physical layer signaling that activates SPS transmission is located at a restricted transmission time; or the SPS period is notified by higher-layer signaling, while the physical layer signaling that activates SPS transmission is located at a restricted transmission time, and the offset value and transmission time interval length are jointly encoded.

[0072] The SPS transmission time is determined by one of the following: SPS period, offset, and transmission time interval length; SPS period and offset; offset and transmission time interval length.

[0073] Optionally, the restricted transmission time includes at least one of the following: only located in the Physical Downlink Control Channel (PDCCH), only located in short transmission time interval #0 and / or short transmission time interval #3, only located in the control resource set configured in the time slot and the resource set is located in the first P symbols of the time slot, or only located in the first control resource set in the time domain among multiple control resource sets configured in the time slot, wherein P takes values ​​including: 1, 2, 3, 7.

[0074] Optionally, the joint encoding includes at least: the unified indication of SPS period and offset is such that the number of offset values ​​for each period is the number of times the SPS period contains one short transmission time interval or one service duration; or the number of offset values ​​for each period is less than or equal to the number of times the SPS period contains one short transmission time interval or one service duration.

[0075] According to another embodiment of the present invention, a method for determining a control channel element is also provided, comprising:

[0076] A control channel unit is formed by selecting a portion of the resource unit groups from the N resource unit groups, and the control channel unit is formed in at least one of the following ways:

[0077] For the Physical Downlink Control Channel (PDCCH) based on demodulation reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: M REGs are grouped together in the frequency domain at equal or discrete intervals to form a CCE, where M is the number of REGs contained in K RBs in a TTI, and K is a positive integer and N is a positive integer.

[0078] For the Physical Downlink Control Channel (PDCCH) based on cell reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: a group of REGs that are equally spaced or discretely spaced in the frequency domain constitutes a CCE in a single symbol.

[0079] Optionally, when the mapping between the control channel unit (CCE) and the resource unit group (REG) is a centralized mapping, a group of REGs that are consecutive in the frequency domain in a single symbol constitutes a CCE, and the aggregation level is indicated by an interleaving method or physical layer signaling, or different scrambling is applied to the information of different aggregation levels.

[0080] Optionally, when a group of REGs that are equally or discretely spaced in the frequency domain in a single symbol constitutes a CCE for use in a short physical downlink control channel (sPDCCH), the sREG indexes constituting sCCE#n are at least one of the following:

[0081] Method 1:

[0082] Method 2:

[0083] Where n = 0, ..., N sCCE,p -1 and N sCCE,p This represents the number of sCCEs in the control channel resource block set p. and This indicates the number of sREGs contained in each sCCE. This represents the number of sREGs contained in each OFDM symbol within the control channel resource block set p.

[0084] Optionally, the interleaving method includes: for a candidate set with aggregation level L, the REG indices contained in the candidate set are sequentially written into the interleaver, read out from the interleaver according to the column permutation pattern, and empty elements are deleted after reading out, wherein an REG index greater than X is defined as an empty element;

[0085] Where L = 1, 2, 4 or 8;

[0086] Where X = L·M⁻¹, and M represents the number of REGs contained in each CCE.

[0087] Optionally, the column permutation pattern includes at least one of the following:

[0088] <1,17,9,25,5,21,13,29,3,19,11,27,7,23,15,31,0,16,8,24,4,20,12,28,2,18,10,26,6,22,14,30>;

[0089] <0,4,8,12,16,20,24,28,1,5,9,13,17,21,25,29,2,6,10,14,18,22,26,30,3,7,11,15,19,23,27,31>.

[0090] According to another embodiment of the present invention, a reference signal determining apparatus is also provided, comprising:

[0091] The first indication module is used to indicate, in a preset manner, that a reference signal exists in at least one of the N scheduled transmission time intervals (TTIs), where N is a positive integer.

[0092] According to another embodiment of the present invention, a device for determining a control channel unit is also provided, comprising:

[0093] The selection module is used to select a portion of the resource unit groups from N resource unit groups to form a control channel unit, and to form a control channel unit in at least one of the following ways:

[0094] For the Physical Downlink Control Channel (PDCCH) based on demodulation reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: M REGs are grouped together in the frequency domain at equal or discrete intervals to form a CCE, where M is the number of REGs contained in K RBs in a TTI, and K is a positive integer and N is a positive integer.

[0095] For the Physical Downlink Control Channel (PDCCH) based on cell reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: a group of REGs that are equally spaced or discretely spaced in the frequency domain constitutes a CCE in a single symbol.

[0096] According to another embodiment of the present invention, a reference signal determining apparatus is also provided, comprising:

[0097] The first determining module is used to determine, through a preset method, that in every N transmission time intervals in semi-static scheduling (SPS) transmission, at least one transmission time interval contains a reference signal, where N is a positive integer.

[0098] According to another embodiment of the present invention, a device for determining the timing of semi-static scheduling (SPS) transmission is also provided, comprising:

[0099] The indication module is used to indicate the SPS period, offset value, and transmission time interval length through joint encoding of higher layer signaling; or to indicate the SPS period and offset value through higher layer signaling, while activating the physical layer signaling of SPS transmission at a restricted transmission time; or to notify the SPS period through higher layer signaling, while activating the physical layer signaling of SPS transmission at a restricted transmission time, and jointly encoding the offset value and transmission time interval length.

[0100] The second determining module is used to determine the SPS transmission time by one of the following obtained by indication: SPS period, offset value and transmission time interval length; SPS period and offset value; offset value and transmission time interval length.

[0101] According to another embodiment of the present invention, a storage medium is also provided, the storage medium comprising a stored program, wherein the program, when executed, performs a method for determining a reference signal or a method for determining a control channel unit.

[0102] By means of the present invention, since a reference signal is present in at least one of the N scheduled transmission time intervals (TTIs) can be indicated by a preset method, it can be indicated that not every TTI in the N transmission time intervals contains a reference signal. This solves the problem in the related art where the overhead of the reference signal is large due to the transmission of the reference signal in every short time interval, and reduces the overhead of the reference signal. Attached Figure Description

[0103] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0104] Figure 1 This is a flowchart of a method for determining a reference signal according to an embodiment of the present invention;

[0105] Figure 2 This is a structural block diagram of a reference signal determination device according to an embodiment of the present invention;

[0106] Figure 3 This is a flowchart of a method for determining a control channel unit according to an embodiment of the present invention;

[0107] Figure 4 This is a structural block diagram of a control channel unit determination device according to an embodiment of the present invention;

[0108] Figure 5 This is a schematic diagram of the downlink STTI structure according to an optional embodiment of the present invention;

[0109] Figure 6This is a schematic diagram of the uplink STTI structure according to an optional embodiment of the present invention;

[0110] Figure 7 This is a schematic diagram of centralized mapping and distributed mapping according to optional embodiments of the present invention;

[0111] Figure 8 This is another schematic diagram of centralized mapping and distributed mapping according to an optional embodiment of the present invention;

[0112] Figure 9 This is yet another flowchart of a method for determining a reference signal according to an embodiment of the present invention;

[0113] Figure 10 This is a flowchart of a method for determining the SPS transmission time according to an embodiment of the present invention;

[0114] Figure 11 This is another structural block diagram of a reference signal determination device according to an embodiment of the present invention;

[0115] Figure 12 This is a structural block diagram of an SPS transmission timing determination device according to an embodiment of the present invention. Detailed Implementation

[0116] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0117] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0118] Example 1

[0119] This embodiment provides a method for determining a reference signal. Figure 1 This is a flowchart of a method for determining a reference signal according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps:

[0120] Step S102: Indicate, by a preset method, that at least one of the N scheduled transmission time intervals contains a reference signal, where N is a positive integer.

[0121] By means of the present invention, since a reference signal is present in at least one of the N scheduled transmission time intervals (TTIs) can be indicated by a preset method, it can be indicated that not every TTI contains a reference signal. This solves the problem in the related art where the overhead of the reference signal is large because the reference signal is transmitted in every short time interval, thus reducing the overhead of the reference signal.

[0122] Although the embodiments of the present invention specify that a reference signal exists in at least one of N transmission time intervals (TTIs), in order to better solve the technical problem, a preset method is used to indicate that at least one TTI, and less than or equal to N TTIs, have a reference signal.

[0123] Optionally, when the position of the reference signal is fixed in the TTI, a preset method is used to indicate that a reference signal exists in at least one TTI across N transmission time intervals, including at least one of the following:

[0124] Method 1: In N transmission time intervals (TTIs), a reference signal exists only in the first TTI, and there is no reference signal in the remaining TTIs;

[0125] Method 2: The N TTIs of the instruction scheduling contain one TTI where the reference signal is located;

[0126] Method 3: Indicate whether each of the N TTIs in the schedule contains a reference signal;

[0127] Method 4: The N TTIs of the instruction schedule contain at most K TTIs where the reference signal is located, where K is a positive integer less than N;

[0128] Method 5: Indicate whether the reference signal is carried in any of the N TTIs except the first TTI and the location of the reference signal. The first TTI always has a reference signal. Indicate whether there is another TTI containing a reference signal and the location of the other TTI containing the reference signal.

[0129] Method Six: By indicating reference signal patterns in N TTIs, where,

[0130] The reference signal pattern is a set of patterns when scheduling the number of TTIs x.

[0131] Alternatively, the reference signal pattern may also carry information about the number of scheduled TTIs.

[0132] Alternatively, the reference signal pattern may also carry feedback ACK / NACK timing information.

[0133] It should be noted that the implementation methods one through six described above can be applied to both downlink and uplink transmission processes, and the embodiments of the present invention do not limit this application. Preferably, methods one through six are used in scenarios where the reference signal position is fixed in the TTI.

[0134] Optionally, when two or more of the N TTIs contain reference signals, the reference signals are of the same type.

[0135] Optionally, when reference signals exist in two or more of the N TTIs, the reference signals are of the same type when the TTI types are different. In this embodiment of the invention, the TTI types are different subframe types, such as MBSFN subframes and non-MBSFN subframes; or the TTI types are different slot types, such as pure downlink slots, pure uplink slots, and slots composed of downlink portion + reserved portion + uplink portion.

[0136] Optionally, the fifth method is implemented in one of the following ways:

[0137] Indicates the position of one TTI containing a reference signal among N TTIs, excluding the first TTI;

[0138] Use 1 bit to indicate whether there is another TTI containing a reference signal among the N TTIs, excluding the first TTI. When there is another TTI containing a reference signal, the position of that TTI is fixed at the last of the N scheduled TTIs.

[0139] Optionally, supporting the use of unused resources of the Physical Downlink Control Channel (PDCCH) for the Physical Downlink Shared Channel (PDSCH), which can also be understood as the short sPDSCH, includes at least one of the following:

[0140] Of the N TTIs, only the first TTI supports PDSCH using resources not used by PDCCH;

[0141] When N>1, it is not supported for PDSCH to use resources not used by PDCCH;

[0142] When N=1, PDSCH is supported in using resources not used by PDCCH;

[0143] In N TTIs, all TTIs reuse the same unused PDCCH resources as the first TTI.

[0144] Optionally, the timing of the ACK / NACK feedback for the data carried in N TTIs is determined based on the position of the reference signal, and the determination method includes at least one of the following:

[0145] Method 1: When only one TTI out of multiple TTIs contains a reference signal, the timing of the feedback ACK / NACK when the reference signal is contained in the first TTI is k1, and the timing of the feedback ACK / NACK when the reference signal is contained in a non-first TTI is k2, then k1 is satisfied. <k2;

[0146] Method 2: When more than one TTI contains a reference signal, the timing of the feedback ACK / NACK when the last TTI contains a reference signal is k3, and the timing of the feedback ACK / NACK when the last TTI does not contain a reference signal is k4, then k3>k4 is satisfied.

[0147] Among them, k1, k2, k3, and k4 are all positive numbers.

[0148] Optionally, when the position of the reference signal is not fixed in the TTI, a preset method is used to indicate that a reference signal exists in at least one of the N transmission time intervals (TTIs), including at least one of the following:

[0149] Method 1: By indicating the reference signal pattern of the first TTI among N TTIs, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0150] Method 2: By indicating one TTI out of N TTIs and the reference signal pattern in that TTI, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0151] Method 3: By indicating the reference signal pattern of at most K TTIs out of N TTIs, where the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling, and K is a positive integer less than N;

[0152] Method 4: By indicating the reference signal pattern for each of the N TTIs, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0153] Method 5: Indicate whether the reference signal is carried in any of the N TTIs except the first TTI and the location of the reference signal. The first TTI always has a reference signal. Indicate whether there is another TTI containing a reference signal and the location of the other TTI containing the reference signal, and indicate the location of the reference signal in that TTI.

[0154] Method Six: By indicating reference signal patterns in N TTIs, where,

[0155] The reference signal pattern is a set of patterns when scheduling the number of TTIs x.

[0156] Alternatively, the reference signal pattern may also carry information about the number of scheduled TTIs.

[0157] Alternatively, the reference signal pattern may also carry feedback ACK / NACK timing information.

[0158] It should be noted that the implementation methods one through six described above can be applied to both uplink and downlink transmission processes, and this embodiment of the invention does not limit this application. Preferably, methods one through six are used in scenarios where the reference signal position is not fixed in the TTI.

[0159] Optionally, when two or more of the N TTIs contain reference signals, the reference signals are of the same type.

[0160] Optionally, when reference signals exist in two or more of the N TTIs, the reference signal types are the same when the TTI types are different. The TTI types are different subframe types, such as MBSFN subframes and non-MBSFN subframes; or the TTI types are different slot types, such as pure downlink slots, pure uplink slots, and slots composed of downlink portion + reserved portion + uplink portion.

[0161] Optionally, the fifth method is implemented in one of the following ways:

[0162] Indicates the position of one transmission time interval containing a reference signal among N transmission time intervals, excluding the first transmission time interval, and indicates the position of the reference signal in that transmission time interval;

[0163] The method indicates whether there is another transmission time interval containing a reference signal among N transmission time intervals other than the first transmission time interval, and indicates the position of the reference signal in that transmission time interval. Preferably, 1 bit is used to indicate whether there is another transmission time interval containing a reference signal among N transmission time intervals other than the first transmission time interval, and indicates the position of the reference signal in that transmission time interval.

[0164] Optionally, the method further includes:

[0165] When another TTI contains a reference signal, the position of that TTI is fixed at the last of the N scheduled TTIs.

[0166] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0167] Example 2

[0168] This embodiment also provides a reference signal determination device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0169] Figure 2 This is a structural block diagram of a reference signal determination device according to an embodiment of the present invention, such as... Figure 2 As shown, the device includes:

[0170] The first indication module 20 is used to indicate, in a preset manner, that a reference signal exists in at least one of the N scheduled transmission time intervals (TTIs), where N is a positive integer.

[0171] In an optional embodiment, the first indicating module 20 is further configured to perform at least one of the following operations:

[0172] When the position of the reference signal is fixed in the TTI, a preset method is used to indicate that the reference signal exists in at least one TTI out of N transmission time intervals (TTIs), including at least one of the following:

[0173] Method 1: In N transmission time intervals (TTIs), a reference signal exists only in the first TTI, and there is no reference signal in the remaining TTIs;

[0174] Method 2: The N TTIs of the instruction scheduling contain one TTI where the reference signal is located;

[0175] Method 3: Indicate whether each of the N TTIs in the schedule contains a reference signal;

[0176] Method 4: The N TTIs of the instruction schedule contain at most K TTIs where the reference signal is located, where K is a positive integer less than N;

[0177] Method 5: Indicate whether the reference signal is carried in any of the N TTIs except the first TTI and the location of the reference signal. The first TTI always has a reference signal. Indicate whether there is another TTI containing a reference signal and the location of the other TTI containing the reference signal.

[0178] Method Six: By indicating reference signal patterns in N TTIs, where,

[0179] The reference signal pattern is a set of patterns when scheduling the number of TTIs x.

[0180] Alternatively, the reference signal pattern may also carry information about the number of scheduled TTIs.

[0181] Alternatively, the reference signal pattern may simultaneously carry feedback ACK / NACK timing.

[0182] Optionally, when two or more of the N TTIs contain reference signals, the reference signals are of the same type.

[0183] Optionally, when reference signals exist in two or more of the N TTIs, the reference signals are of the same type when the TTI types are different. In this embodiment of the invention, the TTI types are different subframe types, such as MBSFN subframes and non-MBSFN subframes; or the TTI types are different slot types, such as pure downlink slots, pure uplink slots, and slots composed of downlink portion + reserved portion + uplink portion.

[0184] Optionally, the fifth method is implemented in one of the following ways:

[0185] Indicates the position of one TTI containing a reference signal among N TTIs, excluding the first TTI;

[0186] Use 1 bit to indicate whether there is another TTI containing a reference signal among the N TTIs, excluding the first TTI. When there is another TTI containing a reference signal, the position of that TTI is fixed at the last of the N scheduled TTIs.

[0187] Optionally, during downlink transmission, the use of unused resources of the Physical Downlink Control Channel (PDCCH) for the Physical Downlink Shared Channel (PDSCH), which can also be understood as the short sPDSCH, includes at least one of the following:

[0188] Of the N TTIs, only the first TTI supports PDSCH using resources not used by PDCCH;

[0189] When N>1, it is not supported for PDSCH to use resources not used by PDCCH;

[0190] When N=1, PDSCH is supported in using resources not used by PDCCH;

[0191] In N TTIs, all TTIs reuse the same unused PDCCH resources as the first TTI.

[0192] Optionally, the timing of the ACK / NACK feedback for the data carried in N TTIs is determined based on the position of the reference signal, and the determination method includes at least one of the following:

[0193] Method 1: When only one TTI out of multiple TTIs contains a reference signal, the timing of the feedback ACK / NACK when the reference signal is contained in the first TTI is k1, and the timing of the feedback ACK / NACK when the reference signal is contained in a non-first TTI is k2, then k1 is satisfied. <k2;

[0194] Method 2: When more than one TTI contains a reference signal, the timing of the feedback ACK / NACK when the last TTI contains a reference signal is k3, and the timing of the feedback ACK / NACK when the last TTI does not contain a reference signal is k4, then k3>k4 is satisfied.

[0195] Among them, k1, k2, k3, and k4 are all positive numbers.

[0196] Optionally, when the position of the reference signal is not fixed within a TTI, a preset method is used to indicate that a reference signal exists in at least one TTI out of N transmission time intervals (TTIs), and the position of the reference signal is not fixed within the TTI, including at least one of the following:

[0197] Method 1: By indicating the reference signal pattern of the first TTI among N TTIs, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0198] Method 2: By indicating one TTI out of N TTIs and the reference signal pattern in that TTI, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0199] Method 3: By indicating the reference signal pattern of at most K TTIs out of N TTIs, where the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling, and K is a positive integer less than N;

[0200] Method 4: By indicating the reference signal pattern for each of the N TTIs, wherein the reference signal pattern is consistent with the reference signal pattern during single TTI scheduling;

[0201] Method 5: Indicate whether the reference signal is carried in any of the N TTIs except the first TTI and the location of the reference signal. The first TTI always has a reference signal. Indicate whether there is another TTI containing a reference signal and the location of the other TTI containing the reference signal and its position in that TTI.

[0202] Method Six: By indicating reference signal patterns in N TTIs, where,

[0203] The reference signal pattern is a set of patterns when scheduling the number of TTIs x.

[0204] Alternatively, the reference signal pattern may also carry information about the number of scheduled TTIs.

[0205] Alternatively, the reference signal pattern may also carry feedback ACK / NACK timing information.

[0206] Optionally, when two or more of the N TTIs contain reference signals, the reference signals are of the same type.

[0207] Optionally, when reference signals exist in two or more of the N TTIs, the reference signal types are the same when the TTI types are different. The TTI types are different subframe types, such as MBSFN subframes and non-MBSFN subframes; or the TTI types are different slot types, such as pure downlink slots, pure uplink slots, and slots composed of downlink portion + reserved portion + uplink portion.

[0208] Optionally, the fifth method is implemented in one of the following ways:

[0209] Indicates the position of one transmission time interval containing a reference signal among N transmission time intervals, excluding the first transmission time interval, and indicates the position of the reference signal in that transmission time interval;

[0210] Indicates whether there is another transmission time interval besides the first transmission time interval that contains the reference signal, and indicates the position of the reference signal in that transmission time interval.

[0211] Optionally, the method further includes:

[0212] When another TTI contains a reference signal, the position of that TTI is fixed at the last of the N scheduled TTIs.

[0213] It should be noted that the implementation methods of methods one to five described above can be applied to the downlink transmission process or the uplink transmission process, and the embodiments of the present invention do not limit this.

[0214] Example 3

[0215] In this embodiment of the invention, a method for determining a control channel element is also provided. Figure 3 This is a flowchart of a method for determining a control channel unit according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps:

[0216] Step S302: Select a portion of the resource unit groups from the N resource unit groups to form a control channel unit, and form a control channel unit in at least one of the following ways:

[0217] For the Physical Downlink Control Channel (PDCCH) based on demodulation reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: M REGs are grouped together in the frequency domain at equal or discrete intervals to form a CCE, where M is the number of REGs contained in K RBs in a TTI, and K is a positive integer and N is a positive integer.

[0218] For the Physical Downlink Control Channel (PDCCH) based on cell reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: a group of REGs that are equally spaced or discretely spaced in the frequency domain constitutes a CCE in a single symbol.

[0219] Through the above steps, a portion of the resource unit groups are selected from the N resource unit groups to form a control channel unit in step S302. This provides a scheme for determining the control channel unit for both the physical downlink control channel (PDCCH) based on demodulation reference signals and the physical downlink control channel (PDCCH) based on cell reference signals.

[0220] Among them, K is preferably taken as 1, 2, or 3.

[0221] Optionally, when the mapping between the control channel unit (CCE) and the resource unit group (REG) is a centralized mapping, a group of REGs that are consecutive in the frequency domain in a single symbol constitutes a CCE. In order to avoid the REG resources used by the high aggregation level completely containing the REG resources used by the low aggregation level, an interleaving method or physical layer signaling is used to indicate the aggregation level, or different scrambling is applied to the information of different aggregation levels.

[0222] In this embodiment of the invention, the interleaving method includes: for a candidate set with aggregation level L, the REG indices contained in the candidate set are sequentially written into the interleaver, read from the interleaver according to the column permutation pattern, and after reading, empty elements are deleted, wherein a REG index greater than X is defined as an empty element.

[0223] Where L = 1, 2, 4 or 8, that is, L may take one of the values ​​1, 2, 4 or 8;

[0224] Where X = L·M⁻¹, and M represents the number of REGs contained in each CCE.

[0225] Optionally, the column permutation pattern includes at least one of the following:

[0226] <1,17,9,25,5,21,13,29,3,19,11,27,7,23,15,31,0,16,8,24,4,20,12,28,2,18,10,26,6,22,14,30>;

[0227] <0,4,8,12,16,20,24,28,1,5,9,13,17,21,25,29,2,6,10,14,18,22,26,30,3,7,11,15,19,23,27,31>.

[0228] Example 4

[0229] This embodiment also provides a control channel unit determination device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0230] Figure 4 This is a structural block diagram of a control channel unit determination device according to an embodiment of the present invention, such as... Figure 4 As shown, the device includes:

[0231] Selection module 40 is used to select a portion of the resource unit groups from N resource unit groups to form a control channel unit, and to form a control channel unit in at least one of the following ways:

[0232] For the Physical Downlink Control Channel (PDCCH) based on demodulation reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: M REGs are grouped together in the frequency domain at equal or discrete intervals to form a CCE, where M is the number of REGs contained in K RBs in a TTI, and K is a positive integer and N is a positive integer.

[0233] For the Physical Downlink Control Channel (PDCCH) based on cell reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: a group of REGs that are equally spaced or discretely spaced in the frequency domain constitutes a CCE in a single symbol.

[0234] By employing the above technical solution, a control channel unit is formed by selecting a portion of the resource unit groups from the N resource unit groups in the above manner. This provides a scheme for determining the control channel unit for both the physical downlink control channel (PDCCH) based on demodulation reference signals and the physical downlink control channel (PDCCH) based on cell reference signals.

[0235] Example 5

[0236] According to embodiments of the present invention, a method for determining a reference signal is also provided, such as... Figure 9 As shown, Figure 9 This is another flowchart of a method for determining a reference signal according to an embodiment of the present invention, such as... Figure 9 As shown, it includes:

[0237] Step S902: Determine, by a preset method, that in every N transmission time intervals in SPS transmission, at least one transmission time interval contains a reference signal, where N is a positive integer.

[0238] It should be noted that in the preferred embodiment of the present invention, N is preferably 2.

[0239] Optionally, the time-domain position of the reference signal is fixed during the transmission time interval, and the preset method includes at least one of the following:

[0240] Method 1: Predefined that in every N transmission time intervals, the reference signal is only present in the first transmission time interval;

[0241] Method 2: Indicate whether to reduce the reference signal density in every N transmission time intervals via signaling. Here, not reducing the reference signal density means that all N transmission time intervals contain the reference signal, and reducing the reference signal density means that the reference signal is contained in less than N transmission time intervals.

[0242] Method 3: Indicate the reference signal pattern in every N transmission time intervals via signaling.

[0243] Optionally, the reference signal density is reduced by at least one of the following methods: the reference signal is present only in the first transmission time interval; the reference signal is present only in the first and last transmission time intervals; the reference signal is present only in the first and transmission time intervals offset x from the first, where x is an integer taken from the set [0, N].

[0244] Optionally, the time-domain position of the reference signal is not fixed during the transmission time interval, and the preset method includes at least one of the following:

[0245] Method 1: Predefined that each of the N transmission time intervals contains a reference signal;

[0246] Method 2: Predefined that in every N transmission time intervals, the reference signal is only present in the first transmission time interval;

[0247] Method 3: Indicate whether to reduce the reference signal density in every N transmission time intervals by signaling. Wherein, not reducing the reference signal density means that all N transmission time intervals contain the reference signal, and reducing the reference signal density means that less than N transmission time intervals contain the reference signal. Preferably, the reference signal density can be indicated by 1 bit of signaling in every N transmission time intervals.

[0248] Method 4: Indicate the reference signal pattern in every N transmission time intervals via signaling.

[0249] Optionally, in every N transmission time intervals, the first OFDM symbol in the transmission time interval containing the reference signal contains the reference signal.

[0250] Optionally, the reference signal density is reduced by at least one of the following methods: the reference signal is present only in the first transmission time interval; the reference signal is present only in the first and last transmission time intervals; the reference signal is present only in the first and transmission time intervals offset x from the first, where x is an integer taken from the set [0, N].

[0251] Optionally, the transmission time interval in which the first service transmission activating SPS transmission occurs contains a reference signal.

[0252] Optionally, when the signaling is physical layer signaling, it is only valid for a period of 1 transmission time interval, and all bits corresponding to the signaling are set to 0 for SPS transmission activation confirmation or deactivation confirmation in other periods; or it has different meanings for a period of 1 transmission time interval and other periods respectively, wherein it is valid for a period of 1 transmission time interval and is used for reference signal indication in every N transmission time intervals, and is used for reference signal indication in a single transmission time interval in other periods.

[0253] Optionally, the method is applied to semi-static scheduling (SPS) where the SPS period is one transmission time interval.

[0254] Example 6

[0255] In this embodiment of the invention, a method for determining the transmission time of a semi-static SPS schedule is also provided. Figure 10This is a flowchart of a method for determining the SPS transmission time according to an embodiment of the present invention, as shown below. Figure 10 As shown, it includes:

[0256] Step S1002: Indicate the SPS period, offset value, and transmission time interval length through higher-layer signaling, wherein the transmission time interval length is jointly encoded with the SPS period and offset value; or indicate the SPS period and offset value through higher-layer signaling, while the physical layer signaling for SPS transmission is located at a restricted transmission time; or notify the SPS period through higher-layer signaling, while the physical layer signaling for SPS transmission is located at a restricted transmission time, and the offset value and transmission time interval length are jointly encoded.

[0257] Step S1004, determine the SPS transmission time by one of the following obtained by the indication: SPS period, offset value and transmission time interval length; SPS period and offset value; offset value and transmission time interval length.

[0258] Optionally, the joint encoding includes at least: the unified indication of SPS period and offset is such that the number of offset values ​​for each period is the number of times the SPS period contains one short transmission time interval or one service duration; or the number of offset values ​​for each period is less than or equal to the number of times the SPS period contains one short transmission time interval or one service duration.

[0259] Optionally, the restricted transmission time includes at least one of the following: only located in PDCCH, only located in short transmission time interval sTTI#0 and / or short transmission time interval sTTI#3 (i.e., sTTI with index values ​​of 0 and 3), only located in the control resource set configured in the slot and the resource set is located in the first P symbols of the slot, only located in the first control resource set in the time domain among multiple control resource sets configured in the slot, wherein the value of P includes: 1, 2, 3, 7, that is, the possible values ​​of P are one of 1, 2, 3, 7.

[0260] Example 7

[0261] This embodiment also provides a reference signal determination device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0262] Figure 11 This is another structural block diagram of a reference signal determination device according to an embodiment of the present invention, such as... Figure 11 As shown, the device includes:

[0263] The first determining module 1102 is used to determine, by a preset method, that in every N transmission time intervals in the semi-static scheduling (SPS) transmission, at least one transmission time interval contains a reference signal, where N is a positive integer.

[0264] It should be noted that in the preferred embodiment of the present invention, N is preferably 2.

[0265] Optionally, the time-domain position of the reference signal is fixed during the transmission time interval, and the preset method includes at least one of the following:

[0266] Method 1: Predefined that in every N transmission time intervals, the reference signal is only present in the first transmission time interval;

[0267] Method 2: Indicate whether to reduce the reference signal density in every N transmission time intervals via signaling. Here, not reducing the reference signal density means that all N transmission time intervals contain the reference signal, and reducing the reference signal density means that the reference signal is contained in less than N transmission time intervals.

[0268] Method 3: Indicate the reference signal pattern in every N transmission time intervals via signaling.

[0269] Optionally, the reference signal density is reduced by at least one of the following methods: the reference signal is present only in the first transmission time interval; the reference signal is present only in the first and last transmission time intervals; the reference signal is present only in the first and transmission time intervals offset x from the first, where x is an integer taken from the set [0, N].

[0270] Optionally, the time-domain position of the reference signal is not fixed during the transmission time interval, and the preset method includes at least one of the following:

[0271] Method 1: Predefined that each of the N transmission time intervals contains a reference signal;

[0272] Method 2: Predefined that in every N transmission time intervals, the reference signal is only present in the first transmission time interval;

[0273] Method 3: Indicate whether to reduce the reference signal density in every N transmission time intervals by signaling. Wherein, not reducing the reference signal density means that all N transmission time intervals contain the reference signal, and reducing the reference signal density means that less than N transmission time intervals contain the reference signal. Preferably, the reference signal density can be indicated by 1 bit of signaling in every N transmission time intervals.

[0274] Method 4: Indicate the reference signal pattern in every N transmission time intervals via signaling.

[0275] Optionally, in every N transmission time intervals, only the first OFDM symbol in each transmission time interval contains a reference signal.

[0276] Optionally, the reference signal density is reduced by at least one of the following methods: the reference signal is present only in the first transmission time interval; the reference signal is present only in the first and last transmission time intervals; the reference signal is present only in the first and transmission time intervals offset x from the first, where x is an integer taken from the set [0, N].

[0277] Optionally, the transmission time interval in which the first service transmission activating SPS transmission occurs contains a reference signal.

[0278] Optionally, when the signaling is physical layer signaling, it is only valid for a period of 1 transmission time interval, and all bits corresponding to the signaling are set to 0 for SPS transmission activation confirmation or deactivation confirmation in other periods; or it has different meanings for a period of 1 transmission time interval and other periods respectively, wherein it is valid for a period of 1 transmission time interval and is used for reference signal indication in every N transmission time intervals, and is used for reference signal indication in a single transmission time interval in other periods.

[0279] Optionally, the method is applied to semi-static scheduling (SPS) where the SPS period is one transmission time interval.

[0280] Example 8

[0281] This embodiment also provides an SPS transmission timing determination device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0282] Figure 12 This is a structural block diagram of an SPS transmission timing determination device according to an embodiment of the present invention, as shown below. Figure 12 As shown, the device includes:

[0283] The indication module 1202 is used to indicate the SPS period, offset value and transmission time interval length through higher layer signaling joint encoding; or to indicate the SPS period and offset value through higher layer signaling, while activating the physical layer signaling of SPS transmission at a restricted transmission time; or to notify the SPS period through higher layer signaling, while activating the physical layer signaling of SPS transmission at a restricted transmission time, and jointly encoding the offset value and transmission time interval length.

[0284] The second determining module 1204 is used to determine the SPS transmission time by one of the following obtained by indication: SPS period, offset value and transmission time interval length; SPS period and offset value; offset value and transmission time interval length.

[0285] The above technical solutions are explained below with reference to preferred embodiments 1-5, but are not intended to limit the technical solutions of the embodiments of the present invention.

[0286] Preferred embodiment 1

[0287] Base station scheduling terminal A transmits downlink data over multiple TTIs. Preferably, the number of OFDM symbols included in each TTI is relatively small, for example, no more than 7 OFDM symbols, but it is not limited to this. This embodiment uses the short TTI structure in a Long-Term Evolution (LTE) system for illustration; that is, the TTI can be understood as a short TTI (sTTI), but it is not limited to this. The DL short TTI frame structure is as follows: Figure 5 As shown, a 1ms subframe contains 6 short DL (DownLink) TTIs. When the sPDSCH is configured to start from OFDM symbol #1 or #3, Pattern1 is used; when the sPDSCH is configured to start from OFDM symbol #2, Pattern2 is used. Note that the OFDM symbol numbering starts from 0, meaning there are 14 OFDM symbols in the 1ms subframe, sequentially numbered from #0 to #13.

[0288] A DCI scheduled for multiple sTTIs can be transmitted in any DL sTTI. When the DCI is located in DL sTTI #0, it is carried by the PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sPDCCH channel. Alternatively, a DCI scheduled for multiple sTTIs can be transmitted in some sTTIs, for example, only in DL sTTI #0, or only in DL sTTI #0 and #3.

[0289] When scheduling multiple sTTI transmissions, a maximum of N sTTI transmissions are scheduled. In this case, N consecutive sTTIs are available for sPDSCH transmission. It should be noted that there are scenarios where sPDSCH cannot start at sTTI #0, i.e., when sPDSCH is configured to start from OFDM symbol #2 or #3. In this case, sTTI #0 cannot be used for sPDSCH transmission. Preferably, N = 2, 3, 4, 6, 8, 12, or 16, but is not limited to these. When the maximum number of scheduled sTTI transmissions is determined to be N, the actual number of multiple scheduled sTTI transmissions is 1 to N sTTIs. The value of N is determined by predefinition or by the value configured in the higher-layer signaling. The following description uses N = 4 as an example, but is not limited to this.

[0290] In the scheduled N=4 DL sTTI transmissions, the location of the demodulation reference signal (DMRS, which can also be understood as the reference signal in the above embodiments) is determined by at least one of the following methods: It should be noted that although this embodiment is described using downlink transmission as an example, the method for determining the location of the DMRS is not limited to downlink but can also be used for uplink. This embodiment is preferably for the scenario where the DMRS is fixed in the TTI.

[0291] Method 1: DMRS is included in each STTI by default;

[0292] Beneficial effects: No additional instructions are required. No standardization is needed; the multi-sTTI scheduling mechanism is the same as the eLAA multi-subframe scheduling mechanism. DMRS overhead is proportional to that of single-sTTI scheduling, with no savings.

[0293] Method 2: By default, DMRS is only present in the first scheduled sTTI, and not in the remaining sTTIs;

[0294] Beneficial effects: No additional instructions are required. DMRS overhead is saved, and standardization is simple. Suitable for non-high-speed movement scenarios.

[0295] Method 3: Indicate only one of the N scheduled sTTIs containing the DMRS;

[0296] At this time, the sTTI containing DMRS is located in any one of the multiple sTTIs in the schedule. Taking N=4 as an example, if only one sTTI containing DMRS is considered, 2 bits indicate one of the 4 sTTIs.

[0297] Beneficial effects: It can save DMRS overhead and flexibly indicate sTTIs that include DMRS, and is not limited to the first of multiple sTTIs.

[0298] Method 4: The N scheduled time periods contain at most N time periods where the DMRS is located;

[0299] At this time, the sTTI containing DMRS is located at any position among the multiple sTTIs scheduled, and at most N sTTIs contain DMRS. Taking N=4 as an example, 4 bits are used in bitmap mode to indicate that at most 4 sTTIs contain DMRS.

[0300] Beneficial effects: It can save DMRS overhead and has the largest but most flexible overhead. sTTIs containing DMRS can be located anywhere and at most N sTTIs contain DMRS.

[0301] Method 5: Indicate only that at most two sTTIs containing DMRS are among the multiple sTTIs to be scheduled;

[0302] This indicates that at most two of the N STTIs contain DMRS. For example, when N=4, 4 bits are needed to indicate a total of 10 possibilities. One STTI contains DMRS (4 possibilities), or two STTIs contain DMRS (6 possibilities). For example, when N=6, 5 ​​bits are needed to indicate a total of 21 possibilities. One sTTI contains DMRS (6 possibilities) or two sTTIs contain DMRS (15 possibilities).

[0303] Beneficial effects: Flexible indication of sTTIs containing DMRS, located in at most any two sTTIs, with indication overhead equal to or less than mode 4.

[0304] Method 6: Indicates whether, among the N scheduled sTTIs excluding the first sTTI, the remaining sTTIs carry DMRS and their locations. By default, the first sTTI always carries DMRS. This indicates whether there is another sTTI containing DMRS and the location of that other sTTI containing DMRS.

[0305] Method 6 also includes: Sub-method 6-1 and Sub-method 6-2, wherein Sub-method 6-1 indicates that the DMRS is located in one of the remaining sTTIs excluding the first sTTI. For example, when N=4, as shown in Table 1 below, 2 bits are used to indicate whether there is another sTTI containing the DMRS and the location of the other sTTI containing the DMRS.

[0306] Table 1

[0307] 2-bit indication Are there any other STTIs that include DMRS and their locations? 00 No other STTI includes DMRS 01 The second sTTI includes DMRS 10 The third sTTI includes DMRS 11 The fourth STTI includes DMRS

[0308] Sub-method 6-2: Use 1 bit to indicate whether another sTTI contains DMRS. Preferably, when another sTTI contains DMRS, the position of this sTTI is fixed at the last of the scheduled multiple sTTIs.

[0309] Beneficial effects: It can save DMRS overhead, supporting another sTTI containing DMRS with less indication overhead. Suitable for low-to-medium speed and high-speed mobile scenarios. For example: except for high-speed scenarios, in other cases only a single sTTI needs to contain DMRS; that is, the main reason for another sTTI to contain DMRS is to support high-speed mobile scenarios.

[0310] Method 7: Indicate one of the predefined DMRS patterns. The predefined DMRS patterns are defined separately for the actual number of scheduling multiple sTTIs, or the predefined DMRS patterns and the number of scheduling sTTIs are jointly encoded.

[0311] The predefined DMRS patterns are defined for different actual scheduling numbers for multiple sTTIs: When N=4, the actual scheduling number for at most N=4 sTTIs is n=1, 2, 3, or 4. As shown in Table 2, the predefined DMRS pattern set is defined separately for different actual scheduling numbers of sTTIs. Based on the actual number of sTTIs, it indicates the sTTI position of the DMRS when n sTTIs are actually scheduled, i.e., one of the predefined DMRS pattern sets. It should be noted that the pilot patterns listed in the table are only examples and are not limited to these.

[0312] Table 2

[0313]

[0314]

[0315] Note: R indicates that the sTTI has DMRS, and D indicates that the sTTI does not have DMRS. Taking N=2 as an example, RD means that the first sTTI has DMRS and the second sTTI does not have DMRS. The rest are similar and will not be repeated.

[0316] The predefined DMRS pattern and the number of scheduled sTTIs are jointly encoded. For example, when N=4, the actual number of schedules for at most N=4 sTTIs is n=1, 2, 3, or 4. As shown in Table 3, for different actual number of scheduled sTTIs, the predefined DMRS pattern set and the number of scheduled sTTIs are jointly encoded, indicating the actual number of scheduled sTTIs and the location of the DMRS within that sTTI, i.e., one of the predefined DMRS pattern sets. It should be noted that the pilot patterns listed in the table are only examples and are not limited to these.

[0317] Table 3

[0318]

[0319]

[0320] Note: R indicates that the sTTI has DMRS, and D indicates that the sTTI does not have DMRS. Taking N=2 as an example, RD means that the first sTTI has DMRS and the second sTTI does not have DMRS. The rest are similar and will not be repeated.

[0321] Beneficial effects: It can save DMRS overhead, support another sTTI containing DMRS with less indication overhead, and design multi-sTTI pilot patterns suitable for multi-sTTI scheduling. It is suitable for medium- and low-speed mobile scenarios as well as high-speed mobile scenarios. Furthermore, joint encoding indication can further reduce control overhead.

[0322] In addition, for DL ​​multi-sTTI scheduling, the method of using unused resources of sPDSCH to support sPDCCH includes at least one of the following:

[0323] Method 1: When scheduling multiple sTTIs, only the first sTTI supports sPDSCH using resources not used by sPDCCH.

[0324] Considering that single-sTTI scheduling's support for sPDSCH using unused resources of sPDCCH only applies to the current sTTI and cannot predict sPDCCH resource usage in subsequent sTTIs, and that each sPDSCH in multi-sTTI scheduling is independently coded, supporting this function only in the first sTTI is feasible. Therefore, when displaying the indication, the unused / usedsCCE indication field is only valid for the first sTTI in a multi-sTTI schedule. That is, in multi-sTTI scheduling, only the first sTTI supports sPDSCH using unused resources of sPDCCH.

[0325] Method 2: This function is not supported when multiple STTI scheduling is used.

[0326] That is, unused sPDCCH resources are reused by sPDSCH scheduled by a single sTTI.

[0327] Method 3: When scheduling multiple sTTIs, all sTTIs reuse the same unused sCCE resources as the first sTTI.

[0328] The limitation at this point is that the sCCE index used by the sPDCCH in the same RB set in subsequent sTTIs cannot be greater than the sCCE index used by the sPDCCH in the first sTTI multi-sTTI scheduling.

[0329] Additionally, for multi-TTI scheduling, the feedback timing is implicitly determined based on the DMRS location. The feedback timing is the timing for ACK / NACKing PDSCH or PUSCH. Determining the feedback timing for multi-TTI scheduling services based on the sTTI location containing the DMRS within the multi-sTTI includes at least one of the following methods:

[0330] Method 1: When only one of multiple TTIs contains DMRS, assume the timing of the ACK / NACK feedback when the first sTTI contains DMRS is k1, and assume the timing of the ACK / NACK feedback when other than the first sTTI contains DMRS is k2. <k2;

[0331] Method 2: When more than one TTI contains DMRS, assume that the timing of the feedback ACK / NACK when the last sTTI contains DMRS is k3, and assume that the timing of the feedback ACK / NACK when the last sTTI does not contain DMRS is k4, where k3>k4;

[0332] The technical solution provided by this preferred embodiment can save DMRS overhead during multi-sTTI scheduling, indicating support for one or more sTTIs containing DMRS with less indication overhead, making it suitable for both low-speed and high-speed mobile scenarios. Simultaneously, by saving pilot overhead, more resources can be used for data transmission, improving system spectral efficiency.

[0333] Preferred embodiment 2

[0334] Base station scheduling terminal A transmits uplink data over multiple TTIs, where each TTI contains a limited number of OFDM symbols, for example, no more than 7 OFDM symbols. This preferred embodiment is illustrated using a short TTI structure in an LTE system, but is not limited thereto. The UL short TTI frame structure is as follows: Figure 6 As shown, there are 6 short UL (Up Link) TTIs in the 1ms subframe. Note that the OFDM symbol numbering starts from 0, meaning there are 14 OFDM symbols in the 1ms subframe, numbered sequentially from #0 to #13.

[0335] A DCI scheduled for multiple sTTIs can be transmitted in any DL sTTI. When the DCI is located in DL sTTI #0, it is carried by the PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sPDCCH channel. Alternatively, a DCI scheduled for multiple sTTIs can be transmitted in some sTTIs, for example, only in DL sTTI #0, or only in DL sTTI #0 and #3.

[0336] When scheduling multiple sTTI transmissions, a maximum of N sTTI transmissions can be scheduled. In this case, N consecutive sTTIs are available for transmitting sPUSCH. Preferably, N = 2, 3, 4, 6, or 8, but not limited to these. When the maximum number of scheduled sTTI transmissions is determined to be N, the actual number of multiple scheduled sTTI transmissions is 1 to N sTTIs. The value of N is determined by predefinition or by the value configured in the higher-layer signaling. The following description uses N = 4 as an example, but is not limited to this.

[0337] In the scheduled N=4 UL sTTI transmissions, the location of the DMRS can be determined in at least one of the following ways: It should be noted that although this embodiment uses uplink transmission as an example, the method for determining the location of the DMRS is not limited to uplink but can also be used for downlink. This embodiment is preferably designed for scenarios where the DMRS is not fixed in the TTI.

[0338] Method 1: The DMRS pattern is the same as the DMRS pattern in a single sTTI scheduling, and the way the UL DMRS is indicated is the same as in a single sTTI. In this case, only the DMRS pattern in the first sTTI of the scheduling is indicated, and subsequent sTTIs do not indicate it. The restriction at this time is that the first sTTI cannot indicate a pure D pattern or a |R pattern; it must indicate a pattern containing R.

[0339] It should be noted that the UL DMRS pattern for single sTTI scheduling is shown in Table 4: the included UL DMRS pattern includes at least the pattern listed in Table 1, and may also include other patterns.

[0340] Table 4 UL DMRS position during single sTTI scheduling

[0341]

[0342] It should be noted that "|" in Table 4 represents the boundary of sTTI n.

[0343] Beneficial effects: This method eliminates the need to design a new pattern structure; the pattern remains the same as that used in single sTTI scheduling. No control overhead is added. Except for the first one, none of the other simultaneously scheduled UL sTTIs require DMRS.

[0344] Method 2: The DMRS pattern is the same as the single sTTI pattern, and the bit field is the same as the single sTTI. An indicator of the sTTI position containing the DMRS is added. In this method, only the DMRS pattern in one sTTI containing the DMRS is indicated; other sTTIs are not indicated. The constraint is that the indicated sTTI cannot indicate pure D patterns or |R patterns; it must indicate patterns containing R.

[0345] Beneficial effects: This method eliminates the need to design new pattern structures; the pattern remains the same as that used in single sTTI scheduling. It supports flexible indication of locations containing DMRS. Only one of multiple simultaneously scheduled UL sTTIs contains DMRS.

[0346] Method 3: The DMRS pattern is the same as that for single-sTTI scheduling, but the bit field is N times larger, and each sTTI is independently indicated. For example, when N=4, the bit field is 4 times the number of bits indicating the DMRS position in single-sTTI scheduling. In this case, the DMRS corresponding to each sTTI actually scheduled is indicated. This method is the most flexible but has the highest overhead. For example, if n=2 sTTIs are actually scheduled, assuming the bit field indicating the UL DMRS position in single-sTTI scheduling is 2 bits, the bit field for multi-sTTI scheduling is 8 bits. Since there are 2 UL sTTIs actually scheduled, the first 4 bits of the 8 bits are valid. The first 2 bits of the valid 4 bits indicate the UL DMRS position in the first UL sTTI, and the last 2 bits indicate the UL DMRS position in the second sTTI.

[0347] Beneficial effects: This approach does not require designing a new pattern structure, meaning the pattern remains the same as the single sTTI scheduling structure, while supporting flexible indication with greater control overhead.

[0348] Method 4: Indicates whether and where the DMRS is carried in any of the N scheduled sTTIs other than the first sTTI. By default, the first sTTI always contains a DMRS. This indicates whether there is another sTTI containing a DMRS, the location of that sTTI, and the symbol position of the DMRS within that sTTI. The method for indicating the symbol position of the DMRS within a single sTTI is the same as the method used for indicating the DMRS position during single-sTTI scheduling.

[0349] Method 4 also includes sub-methods 4-1 and 4-2. Sub-method 4-1 indicates that the DMRS is located in one of the remaining sTTIs (excluding the first sTTI) and indicates the symbol position of the DMRS within that sTTI. The method for indicating the symbol position of the DMRS within a single sTTI is the same as the method used for DMRS position indication in single-sTTI scheduling. For example, when N=4, as shown in Table 1, 2 bits are used to indicate whether there is another sTTI containing the DMRS and the location of that other sTTI containing the DMRS.

[0350] Table 1

[0351] 2-bit indication Are there any other STTIs that include DMRS and their locations? 00 No other STTI includes DMRS 01 The second sTTI includes DMRS 10 The third sTTI includes DMRS 11 The fourth STTI includes DMRS

[0352] Sub-method 4-2: Indicates whether another sTTI contains DMRS and indicates the symbol position of the DMRS within that sTTI. Preferably, when another sTTI contains DMRS, the position of that sTTI is fixed at the last of the multiple scheduled sTTIs. The indication of whether another sTTI contains DMRS is preferably performed using 1 bit. The method for indicating the symbol position of the DMRS within a single sTTI is the same as the method for indicating the DMRS position during single sTTI scheduling.

[0353] Beneficial effects: It can save DMRS overhead, supporting another sTTI containing DMRS with less indication overhead. Suitable for low-to-medium speed mobile scenarios and high-speed mobile scenarios.

[0354] Method 5: Indicate one of the predefined DMRS patterns. The predefined DMRS patterns are defined separately for the actual number of scheduling sTTIs, or the predefined DMRS patterns and the number of scheduling sTTIs are jointly encoded.

[0355] This involves predefining the UL DMRS pattern for multiple sTTI scheduling and determining the specific pattern during multiple sTTI scheduling. DMRS patterns are predefined for consecutive 2, 3, ..., N sTTI schedulings. When N=4, DMRS patterns are predefined for consecutive 2, 3, and 4 sTTI schedulings.

[0356] When the pattern is unique in 2, 3, ..., N consecutive sTTI schedulings, no indication is needed. When the pattern has multiple possible values ​​in 2, 3, ..., N consecutive sTTI schedulings, one of them should be indicated.

[0357] Predefined DMRS patterns are defined for the actual number of sTTIs in a multi-sTTI schedule, as shown in Table 5. For N=4, and when scheduling n=1, 2, 3, or 4 consecutive sTTIs, predefined candidate sets of pilot patterns are defined respectively. The meaning of the 2-bit indication is determined based on the number n of consecutively scheduled sTTIs, indicating one of the patterns. It should be noted that the pilot patterns listed in the table are only examples and are not limited to these.

[0358] Table 5

[0359]

[0360] It should be noted that in 3OS, DR corresponds to DDR, and RD corresponds to RDD. Taking N=2 as an example, RD|DD means that the first sTTI has DMRS and is the first symbol in the first sTTI, and the second sTTI does not have DMRS. The rest are similar and will not be elaborated further.

[0361] The predefined DMRS pattern and the number of scheduled sTTIs are jointly encoded. For example, when N=4, the actual number of schedules for at most N=4 sTTIs is n=1, 2, 3, or 4. As shown in Table 6, for different actual number of scheduled sTTIs, the predefined DMRS pattern set and the number of scheduled sTTIs are jointly encoded, indicating the actual number of scheduled sTTIs and the location of the DMRS within that sTTI, i.e., one of the predefined DMRS pattern sets. It should be noted that the pilot patterns listed in the table are only examples and are not limited to these.

[0362] Table 6

[0363]

[0364]

[0365] It should be noted that in 3OS, DR corresponds to DDR, and RD corresponds to RDD. Taking N=2 as an example, RD|DD means that the first sTTI has DMRS and is the first symbol in the first sTTI, and the second sTTI does not have DMRS. The rest are similar and will not be elaborated further.

[0366] Beneficial effects: This method has lower control overhead. However, it requires designing DMRS pattern structures for multiple STTIs. Furthermore, joint encoding indicators can further reduce control overhead.

[0367] The method provided in this preferred embodiment 2 can save DMRS overhead during multi-sTTI scheduling, indicating support for one or more sTTIs containing DMRS with less indication overhead, making it suitable for both low-speed and high-speed mobile scenarios. Simultaneously, by saving pilot overhead, more resources can be used for data transmission, improving system spectral efficiency.

[0368] Preferred Example 3

[0369] Base station scheduling terminal A transmits downlink data in a single TTI or multiple TTIs, where the number of OFDM symbols in the TTI is relatively small, for example, no more than 7 OFDM symbols. This preferred embodiment 3 is illustrated using a short TTI structure in an LTE system, but is not limited to this. The DL short TTI frame structure is as follows: Figure 5 As shown, a 1ms subframe contains 6 short DL (Down Link) TTIs. When the sPDSCH is configured to start from OFDM symbol #1 or #3, Pattern1 is used; when the sPDSCH is configured to start from OFDM symbol #2, Pattern2 is used. Note that the OFDM symbol numbering starts from 0, meaning there are 14 OFDM symbols in the 1ms subframe, sequentially numbered from #0 to #13.

[0370] A DCI scheduled for a single TTI or multiple TTIs can be transmitted in any DL sTTI. When the DCI is located in DL sTTI #0, it is carried by the PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sPDCCH channel. Alternatively, a DCI scheduled for multiple TTIs can be transmitted in some TTIs, for example, only in DL sTTI #0, or only in DL sTTI #0,3.

[0371] sTTI supports both CRS-based sPDCCH and DMRS-based sPDCCH, and both types support centralized and distributed mapping. For CRS-based sPDCCH, both centralized and distributed mapping support frequency-first time-second sCCE-to-sREG mapping. For DMRS-based sPDCCH, both centralized and distributed mapping support time-first frequency-second sCCE-to-sREG mapping (time first, frequency second mapping). The sREG numbering order is as follows: for CRS-based sPDCCH, the sREG numbering order is frequency-first time-second; for DMRS-based sPDCCH, the sREG numbering order is time-first frequency-second.

[0372] Therefore, under these conditions, it is necessary to determine the specific scheme and formula for sCCE-to-sREG mapping.

[0373] It should be noted that for sTTI#1-5, the RB set containing the CRS-based sPDCCH supports 1 or 2 OFDM symbols, which is configured through higher-layer signaling. The number of OFDM symbols in the RB set containing the DMRS-based sPDCCH is the same as the number of OFDM symbols in the sTTI, that is, it supports 2 or 3 OFDM symbols.

[0374] For DMRS-based sPDCCH, assuming the configured RB set Xm The number of PRBs included is N PRB PRBs are configured by higher-layer signaling. They contain N OFDM symbols. OFDMThe number of OFDM symbols is the same as the number of OFDM symbols contained in the sTTI. Given that one sREG represents 1 RB (Rapid Receptor) in an OFDM symbol, which is 12 REs (including pilot signals), the number of sREGs is N. sREG =N PRB ·N OFDM In the following description This indicates the number of sREGs contained in an sCCE.

[0375] In centralized mapping, the principle that must be satisfied is: with N OFDM A set of sREGs, consecutive in the frequency domain, constitutes an sCCE. The sREGs#m contained in sCCE#n satisfy the formula... Or sCCE#n contains the sREG number as in

[0376] In distributed mapping, the following principle must be satisfied: N OFDM Each sREG is a set of equally spaced discrete sCCEs in the frequency domain. The sREGs#m contained in sCCE#n satisfy the formula... Or sCCE#n contains the sREG number as in v = 0, 1, ..., N OFDM -1,

[0377] With N OFDM =2, For example, when N PRB When = 12 PRBs, the schematic diagrams of centralized mapping and distributed mapping are as follows: Figure 7 As shown.

[0378] For CRS-based sPDCCH, assuming the configured RB set X m The number of PRBs included is N PRB PRBs are configured by higher-layer signaling. They contain N OFDM symbols. OFDM OFDM symbols are configured by higher-layer signaling. Given that one sREG represents 1 RB (Range Receiver) in an OFDM symbol, which is 12 REs (including pilot signals), the number of sREGs is N. sREG =N PRB ·N OFDM In the following description This indicates the number of sREGs contained in an sCCE.

[0379] In centralized mapping, the principle is that a group of frequency-domain consecutive sREGs in a single symbol constitutes a sCCE. The sREGs#m contained in sCCE#n satisfy the formula... Or sCCE#n contains the sREG number as in,

[0380] In distributed mapping, the principle is that a group of equally spaced discrete sREGs in the frequency domain constitutes a sCCE in a single symbol. The sREGs#m contained in sCCE#n satisfy at least one of the following formulas:

[0381] Formula 1:

[0382]

[0383] Formula 2:

[0384]

[0385] Formula 3:

[0386] when hour, m≤N sREG / N OFDM ;

[0387] when hour,

[0388] m>N sREG / N OFDM ;

[0389] Formula 4:

[0390] Formula 5:

[0391] Formula 6:

[0392] Formula 7:

[0393] Formula 8:

[0394] Formula 9:

[0395] Alternatively, sCCE#n may contain sREG numbers that are at least one of the following formulas:

[0396] Formula 1:

[0397] in,

[0398] Formula 2:

[0399] in,

[0400] Formula 3:

[0401]

[0402] Where n = 0, ..., N sCCE,p -1 and N sCCE,p This represents the number of sCCEs in the control channel resource block set p. and This indicates the number of sREGs contained in each sCCE. This represents the number of sREGs contained in each OFDM symbol within the control channel resource block set p. Since one sREG corresponds to one RB in one OFDM symbol, therefore... Formula 3 applies when the number of RBs in the RB set is arbitrary. Note that the intermediate term in Formula 3 cannot be written as... Because the number of RBs in the RB set is not... When it is an integer multiple, use This can cause an sCCE that should be mapped to the second symbol to still be mapped to the first symbol, resulting in two sCCEs with different indices having the same sREG, leading to ambiguity and misunderstanding, for example: N PRB =18PRBs, N OFDM =2, When n=4, the sREG corresponding to n=0 is the same as the sREG corresponding to n=0, both being sREG#0,4,8,12. However, this ambiguity and misunderstanding will not occur in Formula 3, where n=0 corresponds to sREG#0,4,8,12, and n=4 corresponds to sREG#18,22,26,30.

[0403] Formula 4:

[0404]

[0405] Where n = 0, ..., N sCCE,p -1 and N sCCE,p This represents the number of sCCEs in the control channel resource block set p. and This indicates the number of sREGs contained in each sCCE. This represents the number of sREGs contained in each OFDM symbol within the control channel resource block set p. Since one sREG corresponds to one RB in one OFDM symbol, therefore... Furthermore, Formula 4 only applies when the number of RBs in the RB set is... Integer multiples of.

[0406] With NOFDM =2, For example, when N PRB When the number of PRBs is 16, the schematic diagrams of centralized and distributed mappings are as follows: Figure 8 As shown.

[0407] Alternatively, in distributed mapping, the principle is that sREGs selected at equal intervals from all numbered sREGs form a sCCE. The sREGs#m contained in sCCE#n satisfy the formula: or Or sCCE#n contains the sREG number as or in

[0408] Meanwhile, when the mapping between the Control Channel Unit (CCE) and Resource Unit Group (REG) is centralized, a group of consecutive REGs in the frequency domain constitutes a CCE within a single symbol. Furthermore, to avoid misinterpretation between different aggregation levels by ensuring that REG resources used by higher aggregation levels completely encompass those used by lower aggregation levels, an interleaving method or physical layer signaling is employed to indicate the aggregation level, or different scrambling techniques are applied to information from different aggregation levels. Note that when used in the sPDCCH channel, CCE corresponds to sCCE, and REG corresponds to sREG.

[0409] When the aggregation level L is indicated via physical layer signaling, the aggregation level used is directly indicated in the DCI, for example, using 2 bits to indicate L = 1, 2, 4, or 8. This is for terminal verification and avoids misunderstandings between different aggregation levels.

[0410] By applying different scrambling methods to information at different aggregation levels: One preferred method is to use different masks for CRC scrambling for different aggregation levels. For example, L = 1, 2, 4, 8 can be scrambled with <0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>, <0,0,0,0,0,0,0,0,0,0,0,0,0,1>, <0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0>, and <0,0,0,0,0,0,0,0,0,0,0,0,0,1,1>. Another preferred method is to use a scrambling sequence to scramble DCI+CRC information, or DCI+CRC encoded information, or rate-matched information, for example... Where b(i) is the information before scrambling, and c(i) is the scrambling sequence (preferably a scrambling sequence generated using a pseudo-random sequence of a Gold sequence of length 31 used in the LTE system), wherein the initial value of the scrambling sequence is distinguished by different aggregation levels (e.g., c...). init =L).

[0411] For the interleaving method: For a candidate set with aggregation level L, its REG indices are written sequentially to the interleaver, read from the interleaver according to the column permutation pattern, and null elements are deleted after reading. A REG index greater than X is defined as a null element.

[0412] Where L = 1, 2, 4 or 8.

[0413] Where X = L·M⁻¹, and M represents the number of REGs contained in each CCE.

[0414] The column permutation pattern is at least one of the following:

[0415] <1,17,9,25,5,21,13,29,3,19,11,27,7,23,15,31,0,16,8,24,4,20,12,28,2,18,10,26,6,22,14,30>;

[0416] <0,4,8,12,16,20,24,28,1,5,9,13,17,21,25,29,2,6,10,14,18,22,26,30,3,7,11,15,19,23,27,31>;

[0417] Taking L=2 and M=4 as an example, for the column permutation pattern <1,17,9,25,5,21,13,29,3,19,11,27,7,23,15,31,0,16,8,24,4,20,12,28,2,18,10,26,6,22,14,30>, REG#0-7 are written sequentially. After reading, if the REG index is greater than 7, it is considered an empty element. <null>After removing empty elements, the REG index is 1,5,3,7,0,4,2,6. This means that the first control channel unit (CCE) of the candidate set with L=2 contains REG#1,5,3,7, while CCE#0 with L=1 contains #1,3,0,2. In this case, the REG resources used by the higher aggregation level do not completely include the REG resources used by the lower aggregation level, thus avoiding misunderstanding between different aggregation levels.

[0418] Similarly, for a column permutation pattern <0,4,8,12,16,20,24,28,1,5,9,13,17,21,25,29,2,6,10,14,18,22,26,30,3,7,11,15,19,23,27,31>, REG#0-7 are written sequentially. After reading, if the REG index is greater than 7, it is considered an empty element. <null>After removing empty elements, the REG index is 0, 4, 1, 5, 2, 6, 3, 7. This means that the first control channel unit (CCE) of the candidate set with L=2 contains REG#0, 4, 1, 5, while CCE#0 with L=1 contains #0, 1, 2, 3. In this case, the REG resources used by the higher aggregation level do not completely include the REG resources used by the lower aggregation level, so there will be no misunderstanding between different aggregation levels.

[0419] Through the technical solution of the above preferred embodiment 3, the resource unit group corresponding to the control channel unit used by the downlink control channel can be determined in single TTI scheduling or multi-TTI scheduling, so that the terminal and the base station can accurately know the specific control resource location. The distributed scheme implemented by this patent can make centralized transmission and distributed transmission have the maximum performance gain respectively.

[0420] Preferred embodiment 4

[0421] Base station activated terminal A performs a semi-static scheduling (SPS) transmission with a cycle of one cycle. Preferably, the TTI contains a small number of OFDM symbols, for example, no more than 7 OFDM symbols, but it is not limited to this. This embodiment uses a short structure in a Long Term Evolution (LTE) system for illustration; that is, it can be understood as a short TTI (sTTI), but it is not limited to this. The DL short TTI frame structure is as follows: Figure 5 As shown, a 1ms subframe contains 6 DL (Down Link) short TTIs. When the sPDSCH is configured to start from OFDM symbol #1 or #3, Pattern1 is used; when the sPDSCH is configured to start from OFDM symbol #2, Pattern2 is used. Note that the OFDM symbol numbering starts from 0, meaning there are 14 OFDM symbols in the 1ms subframe, sequentially numbered from #0 to #13. The UL short TTI frame structure is as follows: Figure 6 As shown, there are 6 short UL (Up Link) TTIs in the 1ms subframe. Note that the OFDM symbol numbering starts from 0, meaning there are 14 OFDM symbols in the 1ms subframe, numbered sequentially from #0 to #13.

[0422] The DCI scheduled for sTTI SPS can be transmitted in any DL sTTI. When the DCI is located in DL sTTI #0, it is carried by the PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sPDCCH channel. Alternatively, the DCI scheduled for sTTI SPS can be transmitted in some sTTIs, for example, only in DL sTTI #0, or only in DL sTTI #0,3.

[0423] When scheduling sTTI SPS transmissions, the minimum period is one sTTI. If the reduction in reference signal density is not considered, each sTTI contains a reference signal. If the reduction in reference signal density is considered, at least one sTTI out of every N sTTIs contains a reference signal. The value of N is determined either by predefinition or by the configuration of higher-layer signaling. Preferably, N = 2, 3, or 6.

[0424] In SPS downlink transmission with an activation period of 1 sTTI, the location of the demodulation reference signal (DMRS, which can also be understood as the reference signal in the above embodiments) is determined in at least one of the following ways every N DL sTTI transmissions: It should be noted that although this example is based on downlink transmission, the method for determining the location of the DMRS is not limited to downlink but can also be used for uplink. This example preferably addresses the scenario where the time-domain location of the DMRS is fixed within a TTI.

[0425] Method 1: Predefined in every N transmission time intervals, only the first transmission time interval contains a reference signal, and the remaining transmission time intervals do not contain a reference signal; no additional indication is required in this case. The first PDSCH activating SPS transmission contains DMRS, and only the first sTTI in every N sTTIs contains DMRS.

[0426] Method 2: Indicate whether to reduce pilot density every N transmission time intervals via 1-bit signaling. The signaling can be higher-layer signaling or physical layer signaling. When reusing physical layer signaling for a single STTI scheduling, 1 bit indicates the presence or absence of DMRS. Not reducing pilot density means all N transmission time intervals contain a reference signal; reducing pilot density means fewer than N transmission time intervals contain a reference signal. Reducing pilot density includes at least one of the following: a reference signal only in the first transmission time interval; a reference signal only in the first and last transmission time intervals; a reference signal only in the first and transmission time intervals offset x from the first, where x is preferably 1, 2, N / 2, N-1, or N.

[0427] Method 3: Indicate the reference signal pattern in every N transmission time intervals via signaling; for example, as shown in Table 7. Note: R indicates that RS is included in the interval, and D indicates that RS is not included in the interval. If N=2, use 1 bit to indicate the pattern as RR or RD. If N=3, use 2 bits to indicate the pattern as RRR, RDD, RDR, or DRD. If N=6, use 2 bits to indicate RRRRRR, RRDRD, RDDRDD, or RDRRDR. Preferably, N=3 is aligned with the slot boundary. Preferably, N=6 is aligned with the subframe boundary.

[0428] Table 7 shows the pilot pattern every N seconds.

[0429] N＝2 N＝3 N＝6 RR RRR RRRRRR RD RDD RDRDRD RDR RDDRDD DRD RDRRDR

[0430] At this time, for a set of N sTTIs, if no data is sent in the first sTTI, but data is sent in subsequent sTTIs, the solution for how to use the reference signal includes at least one of the following: (1) The reference signal used is the most recently received DMRS; (2) DMRS is sent even when no data is sent; (3) It is delayed until the next sTTI containing DMRS. At this time, for N=2, it is only necessary to delay by one sTTI, and the next sTTI is the sTTI containing DMRS.

[0431] During SPS uplink transmission with an activation period of 1 sTTI, the location of the demodulation reference signal (DMRS, also understood as the reference signal in the above embodiments) is determined in at least one of the following ways every N UL sTTI transmissions: It should be noted that although this example is based on uplink transmission, the method for determining the location of the DMRS is not limited to uplink but can also be used for downlink. This example preferably addresses scenarios where the time-domain location of the DMRS is not fixed within a TTI.

[0432] Method 1: Predefined N TTIs, all N TTIs contain a reference signal, and preferably only the first OFDM symbol in each transmission time interval contains a reference signal. This method does not reduce the reference signal density and predefines the symbol position of the reference signal in each sTTI.

[0433] Method 2: Predefined so that in every N transmission time intervals, only the first transmission time interval contains a reference signal, and preferably only the first OFDM symbol in the first transmission time interval contains a reference signal, while the remaining transmission time intervals do not contain a reference signal; in this case, no additional indication is required. The first PUSCH activating SPS transmission contains DMRS, and only the first sTTI in every N sTTIs contains DMRS.

[0434] Method 3: Indicate whether to reduce the reference signal density every N transmission time intervals via 1-bit signaling. The signaling can be higher-layer signaling or physical layer signaling. When reusing a single sTTI scheduler, the physical layer signaling uses 2 bits to indicate the DMRS position. Not reducing the reference signal density means that all N transmission time intervals contain a reference signal, preferably only the first OFDM symbol in each transmission time interval contains a reference signal. Reducing the reference signal density means that fewer than N transmission time intervals contain a reference signal, preferably only the first OFDM symbol in the transmission time intervals containing a reference signal contains a reference signal. Reducing the reference signal density includes at least one of the following: a reference signal only in the first transmission time interval; a reference signal only in the first and last transmission time intervals; a reference signal only in the first and transmission time intervals offset x from the first, where x is preferably 1, 2, N / 2, N-1, or N.

[0435] Method 4: Indicate the reference signal pattern in every N transmission time intervals via signaling; for example, as shown in Table 8. Note: R indicates that the OFDM symbol contains DMRS, and D indicates that the OFDM symbol does not contain DMRS. Note: When 3OS, DR corresponds to DDR, and RD corresponds to RDD. If N=2, use 2 bits to indicate the pattern as RD|RD, RD|DD, DR|DD, or DD|RD. If N=3, use 2 bits to indicate the pattern as RD|RD|RD, RD|DD|DD, RD|DD|RD, or DD|RD|DD. If N=6, use 2 bits to indicate RD|RD|RD|RD|RD|RD, RD|DD|RD|DD|RD|DD, RD|DD|DD|RD|DD|DD, or DD|RD|DD|DD|RD|DD. Preferably, N=3 is aligned with the slot boundary. Preferably, N=6 is aligned with the subframe boundary.

[0436] Table 8 indicates the reference signal pattern for every N sTTIs.

[0437] N＝2 N＝3 N＝6 RD|RD RD|RD|RD RD|RD|RD|RD|RD|RD RD|DD RD|DD|DD RD|DD|RD|DD|RD|DD DR|DD RD|DD|RD RD|DD|DD|RD|DD|DD DD|RD DD|RD|DD DD|RD|DD|DD|RD|DD

[0438] Note:|denotes the boundary of sTTI n

[0439] At this time, for a set of N sTTIs, if no data is sent in the first sTTI, but data is sent in subsequent sTTIs, the solution for how to use the reference signal includes at least one of the following: (1) The reference signal used is the most recently received DMRS; (2) DMRS is sent even when no data is sent; (3) It is delayed until the next sTTI containing DMRS. At this time, for N=2, it is only necessary to delay by one sTTI, and the next sTTI is the sTTI containing DMRS.

[0440] Preferably, the TTI in which the first service transmission activating SPS transmission is located contains a reference signal.

[0441] Preferably, when the signaling is physical layer signaling, it is only valid for a period of 1 TTI and is not used for SPS transmission activation confirmation or deactivation confirmation. In other periods, all bits corresponding to the signaling are set to 0 for SPS transmission activation confirmation or deactivation confirmation. Alternatively, it may have different meanings for a period of 1 transmission time interval and other periods (it is valid for a period of 1 transmission time interval and is used for reference signal indication in every N TTIs, while in other periods it is used for reference signal indication in a single TTI).

[0442] The technical solution provided by this preferred embodiment can save DMRS overhead during sTTI SPS scheduling, enabling the indication of one or more sTTIs containing DMRS with less indication overhead, thus being suitable for both low-speed and high-speed mobile scenarios. Simultaneously, by saving reference signal overhead, more resources can be allocated to data transmission, improving system spectral efficiency.

[0443] Preferred Example 5

[0444] Base station configuration terminal A performs semi-static scheduling SPS transmission with a period including one TTI. Preferably, the TTI contains a small number of OFDM symbols, for example, no more than 7 OFDM symbols, but it is not limited to this. In this embodiment, when describing the short TTI structure in a Long-Term Evolution (LTE) system, the TTI can be understood as a short TTI (sTTI), but it is not limited to this and can also be used in 5G NR New Radio systems. It should be noted that in this embodiment, when using LTE as an example, 1 slot contains 7 OFDM symbols with a duration of 0.5ms; when using NR as an example, 1 slot contains 14 OFDM symbols, and with a 15kHz subcarrier interval, the duration is 1ms. The DL short TTI frame structure is as follows... Figure 5 As shown, a 1ms subframe contains 6 DL (Down Link) short TTIs. When the sPDSCH is configured to start from OFDM symbol #1 or #3, Pattern1 is used; when the sPDSCH is configured to start from OFDM symbol #2, Pattern2 is used. Note that the OFDM symbol numbering starts from 0, meaning there are 14 OFDM symbols in the 1ms subframe, sequentially numbered from #0 to #13. The UL shortTTI frame structure is as follows... Figure 6 As shown, there are 6 short UL (Up Link) TTIs in the 1ms subframe. Note that the OFDM symbol numbering starts from 0, meaning there are 14 OFDM symbols in the 1ms subframe, numbered sequentially from #0 to #13.

[0445] Scenario 1: A DCI activating sTTI SPS can be transmitted in any DL sTTI. When the DCI is located in DL sTTI #0, it is carried by the PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sPDCCH channel. In this case, the sTTI length can be configured as 2 / 3os or 1-slot via RRC, and the sTTI SPS period can be configured via RRC. Alternatively, the sTTI length and sTTI SPS period can be configured via joint RRC coding. That is, when configuring the SPS period to 1sTTI, the corresponding sTTI length must also be specified, as shown in Table 9. For example, states 0 and 1 both indicate an SPS period of 1sTTI, but the corresponding sTTI lengths are different. For example, the example in NR shown in Table 10 jointly indicates the service duration (time domain length) and the SPS period. Note that the joint coding indications in Tables 9 and 10 are just examples, and the states are only examples, but not limited to these. In this embodiment, os is an abbreviation for OFDM Symbol.

[0446] Table 9. Joint Encoding Indicators: STTI SPS Period and STTI Length

[0447]

[0448]

[0449] Table 10 shows the SPS cycle and service duration for joint coding.

[0450] Indicator status SPS cycle and business duration 0 One service duration and the service duration is 2os. 1 One service duration and the service duration is 7os. 2 Two service durations, each lasting 2 weeks. 3 3 service durations, each with a duration of 2OS. 4 1 slot and service duration of 2os 5 1 slot and service duration of 7os 6 2 slots and service duration of 2os 7 2 slots and service duration of 7os

[0451] Scenario 2: The DCI for the scheduled active sTTI SPS can be transmitted in a portion of the sTTI, for example, only in DL sTTI#0. Alternatively, in the NR slot (containing 14 OFDM symbols), only the first mini-slot can transmit the DCI for the scheduled sTTI SPS, or there is only one opportunity to trigger the control channel.

[0452] For transmissions only in sTTI#0, DCI is carried via PDCCH. When both the sTTI SPS period and offset are configured via RRC, the sTTI length and sTTI SPS period and offset can be configured separately or jointly encoded.

[0453] When configured separately, the sTTI length is configured as 2 / 3 os or 1-slot via RRC, and the sTTI SPS period and offset are configured via RRC, as shown in Table 11. It should be noted that when the period is greater than 1ms, regardless of the period value, the offset only needs to consider the offset within a 1ms subframe. Table 11 shows the configuration for 2 / 3 os, Table 12 shows the configuration for 1-slot, Table 13 shows the configuration for a 2os service duration in NR, and Table 14 shows the configuration for 7os. In summary, for a given sTTI length or service duration, the number of offset values ​​for each period is as follows: when the SPS period is less than 1ms, the number of offset values ​​is the number of 1sTTI or 1 service duration contained within the SPS period; when the SPS period is greater than 1ms, the number of offset values ​​is the number of 1sTTI or 1 service duration contained within 1ms.

[0454] Table 11 indicates the STTI SPS cycle and offset.

[0455]

[0456] Table 12 indicates the STTI SPS cycle and offset.

[0457]

[0458] Table 13 indicates the SPS period and offset.

[0459]

[0460]

[0461] Table 14 indicates the SPS period and offset.

[0462]

[0463] When configuring joint coding, the sTTI length is configured as 2 / 3 os or 1 slot, along with the sTTI SPS period and offset via RRC, as shown in Table 15. Table 16 shows examples in NR, with service durations of 2 os and 7 os as examples. It should be noted that when the period is greater than 1 ms, regardless of the period and sTTI length, the offset only needs to consider the offset within a 1 ms subframe. In summary, the number of offset values ​​for each period is as follows: when the SPS period is less than 1 ms, the number of offset values ​​is the number of sTTIs or service durations contained in the SPS period; when the SPS period is greater than 1 ms, the number of offset values ​​is the number of sTTIs or service durations contained in a subframe.

[0464] Table 15 indicates the STTI SPS period and offset, and the STTI length.

[0465]

[0466] Table 16 indicates the SPS cycle and offset, and service duration.

[0467]

[0468]

[0469] When the sTTI SPS period is configured via RRC, the sTTI length and SPS offset are indicated by DCI joint coding. In LTE sTTI, this is shown in Table 17. In NR, it is shown in Table 18. The values ​​in the tables are for illustrative purposes only and are not limited to these.

[0470] Table 17 indicates the STTI length and SPS offset.

[0471] Indicator Index sTTI length and SPS offset 0 2 / 3os and offset 0sTTI 1 2 / 3os and offset 1sTTI 2 2 / 3os and offset 2sTTI 3 2 / 3os and offset 3sTTI 4 2 / 3os and offset 4sTTI 5 2 / 3os and offset 5sTTI 6 1 slot and offset 0sTTI 7 1 slot and offset 1sTTI

[0472] Table 18 indicates service duration and SPS offset.

[0473] Indicator Index sTTI length and SPS offset 0 2os and offset 0os 1 2os and offset by 2os 2 2os and offset by 4os 3 2os and offset 7os 4 4os and offset 0os 5 4os and offset 7os 6 7os and offset 0os 7 7os and offset 7os

[0474] Scenario 3: SPS transmission is not triggered by DCI activation, meaning the SPS transmission is entirely configured by RRC. This is also known as schedule-free transmission, or grant-free transmission. In this case, the SPS period, offset, and service time domain length can be configured separately or jointly encoded.

[0475] When configured separately, the service duration and SPS period / offset are configured via RRC signaling. The duration can be at least one of 2os, 4os, or 7os. The principle is: with a defined sTTI length or service duration, the number of offset values ​​for each period is equal to the number of times the SPS period contains 1 sTTI or 1 service duration. For example, the SPS period and offset configuration for 7os is shown in Table 19. Alternatively, with a defined sTTI length or service duration, the number of offset values ​​for each period is less than or equal to the number of times the SPS period contains 1 sTTI or 1 service duration. For example, the SPS period and offset configuration for 7os is shown in Table 20. Note that the values ​​in the table are for illustrative purposes only and are not limited to these values.

[0476] Table 19 indicates the SPS period and offset.

[0477]

[0478]

[0479] Table 20 indicates the SPS period and offset.

[0480] Indicator index I_sps SPS cycle Offset 0 1 business duration I_sps 1-2 1ms I_sps-1 3-4 2ms I_sps-3 5-6 3ms I_sps-5 ... ... ...

[0481] When configuring joint coding, the service duration, SPS period, and offset are configured via RRC signaling. This example uses service durations of 2os and 7os, but is not limited to these. The principle is: for each period offset value, the number of values ​​should be equal to the number of SPS periods containing 1sTTI or 1 service duration, as shown in Table 21. Alternatively, the principle is: for each period offset value, the number of values ​​should be less than or equal to the number of SPS periods containing 1sTTI or 1 service duration, as shown in Table 22. Note that the values ​​in the tables are for illustrative purposes only and are not limited to these specific values.

[0482] Table 21 indicates the SPS cycle and offset, and service duration.

[0483]

[0484]

[0485] Table 22 indicates the SPS cycle and offset, and service duration.

[0486]

[0487] The technical solution provided by this preferred embodiment enables flexible determination of SPS period, offset, and service duration in various ways during short service duration SPS transmission in sTTI SPS or NR, thereby saving physical layer signaling overhead or higher layer signaling overhead.

[0488] Example 9

[0489] Embodiments of the present invention also provide a storage medium comprising a stored program, wherein the program, when executed, performs the method described in any of the preceding embodiments.

[0490] Optionally, in this embodiment, the storage medium may be configured to store program code for performing the following steps:

[0491] S1 indicates, through a preset method, that a reference signal exists in at least one TTI within the scheduled N transmission time intervals, where N is a positive integer.

[0492] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0493] Embodiments of the present invention also provide a processor for running a program, wherein the program executes the steps of any of the methods described above.

[0494] Optionally, in this embodiment, the above procedure is used to perform the following steps:

[0495] S1 indicates, through a preset method, that a reference signal exists in at least one TTI within the scheduled N transmission time intervals, where N is a positive integer.

[0496] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0497] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0498] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention should be included within the scope of protection of the present invention.< / null> < / null>

Claims

1. A method for determining a control channel element, characterized in that, include: A control channel unit is formed by selecting a portion of the resource unit groups from the N resource unit groups, and the control channel unit is formed in at least one of the following ways: For the Physical Downlink Control Channel (PDCCH) based on demodulation reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: M REGs are grouped together in the frequency domain at equal or discrete intervals to form a CCE, where M is the number of REGs contained in K RBs in a transmission time interval, and K is a positive integer and N is a positive integer. For the Physical Downlink Control Channel (PDCCH) based on cell reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: a group of REGs that are equally spaced or discretely spaced in the frequency domain constitutes a CCE in a single symbol.

2. The method according to claim 1, characterized in that, The method further includes: When the mapping between the control channel unit (CCE) and the resource unit group (REG) is a centralized mapping, a group of REGs that are consecutive in the frequency domain in a single symbol constitutes a CCE, and the aggregation level is indicated by interleaving method or physical layer signaling, or different scrambling is applied to information of different aggregation levels.

3. The method according to claim 1, characterized in that, When a group of REGs that are equally or discretely spaced in the frequency domain in a single symbol constitutes a CCE, and this is used for a short physical downlink control channel (sPDCCH), the sREG index that constitutes sCCE#n includes at least one of the following methods: Method 1: Method 2: Where n = 0, ..., N sCCE,p -1 and N sCCE,p This represents the number of sCCEs in the control channel resource block set p. and This indicates the number of sREGs contained in each sCCE. This represents the number of sREGs contained in each OFDM symbol within the control channel resource block set p.

4. The method according to claim 2, characterized in that, The interleaving method includes: for a candidate set with aggregation level L, the REG indices contained in the candidate set are sequentially written into the interleaver, read from the interleaver according to the column permutation pattern, and null elements are deleted after reading. A REG index greater than X is defined as a null element. Where L = 1, 2, 4 or 8; Where X = L·M⁻¹, and M represents the number of REGs contained in each CCE.

5. The method according to claim 4, characterized in that, The column permutation pattern includes at least one of the following: <1,17,9,25,5,21,13,29,3,19,11,27,7,23,15,31,0,16,8,24,4,20,12,28,2,18,10,26,6,22,14,30>； <0,4,8,12,16,20,24,28,1,5,9,13,17,21,25,29,2,6,10,14,18,22,26,30,3,7,11,15,19,23,27,31>。 6. A device for determining a control channel unit, characterized in that, include: The selection module is used to select a portion of the resource unit groups from N resource unit groups to form a control channel unit, and to form a control channel unit in at least one of the following ways: For the Physical Downlink Control Channel (PDCCH) based on demodulation reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: M REGs are grouped together in the frequency domain at equal or discrete intervals to form a CCE, where M is the number of REGs contained in K RBs in a transmission time interval, and K is a positive integer and N is a positive integer. For the Physical Downlink Control Channel (PDCCH) based on cell reference signals, when the mapping between the Control Channel Element (CCE) and the Resource Element Group (REG) is a distributed mapping, at least the following principle must be satisfied: a group of REGs that are equally spaced or discretely spaced in the frequency domain constitutes a CCE in a single symbol.

7. A processor for running a program, wherein the program, when running, performs the method as described in any one of claims 1-5.

8. A storage medium, characterized in that, The storage medium includes a stored program, wherein the program executes the method of any one of claims 1-5 when it is run.

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