CN116600404A

CN116600404A - Method and device for determining control channel unit, and storage medium

Info

Publication number: CN116600404A
Application number: CN202310731026.2A
Authority: CN
Inventors: 石靖; 夏树强; 张雯; 梁春丽; 韩祥辉; 任敏
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-09-29
Filing date: 2017-10-31
Publication date: 2023-08-15
Also published as: CN109587798A; WO2019085953A1; CN109587798B

Abstract

Embodiments of the present invention provide a method and device for determining a control channel unit, and a storage medium, wherein the method for determining a control channel unit includes: selecting a part of resource unit groups from N resource unit groups to form a control channel unit, at least A control channel unit is formed in one of the following ways: For the physical downlink control channel PDCCH based on the demodulation reference signal, when the mapping between the control channel unit CCE and the resource element group REG is a distributed mapping, at least the following principles are satisfied: M REG is a group of CCEs that are equally spaced or spaced apart in the frequency domain, where M is the number of REGs contained in K RBs in a transmission time interval, where K is a positive integer and N is a positive integer; for cell reference signal The physical downlink control channel PDCCH, when the mapping between the control channel element CCE and the resource element group REG is a distributed mapping, at least the following principle is satisfied: in a single symbol, a group of equally spaced or spaced REGs in the frequency domain form a CCE .

Description

Method and device for determining control channel unit and storage medium

The application relates to a Chinese patent application with the application number of 201711050997.1, the application date of 2017, 10 month and 31 date, and the specification of a method and a device for determining a reference signal and a control channel unit and a storage medium.

Technical Field

The present invention relates to the field of communications, and in particular, to a method and apparatus for determining a control channel unit, and a storage medium.

Background

The fourth generation mobile communication technology (4G,the 4th Generation mobile communication technology) and the fifth generation mobile communication technology (5G,the 5th Generation mobile communication technology) are more and more in demand for Long Term Evolution (LTE, long-Term Evolution)/Long Term Evolution-advanced (LTE-advanced/LTE-a, long-Term Evolution Advance). From the current development trend, both 4G and 5G systems are researching and supporting the characteristics of enhancing mobile broadband, ultra-high reliability, ultra-low delay transmission and mass connection.

In order to support the characteristics of ultra-high reliability and ultra-low latency transmission, low latency high reliability services need to be transmitted at shorter transmission time intervals, while in order to meet the high reliability requirements within the specified latency requirements, or to transmit larger data packets within the specified latency requirements, scheduling of multiple short transmission time intervals needs to be supported. Multi-subframe scheduling has been supported in LTE/LTE-a systems, and this mechanism can be used for multiple short transmission time interval scheduling. However, if the reference information is transmitted in each of the scheduled short transmission time intervals, the resource utilization is reduced compared to the multi-subframe scheduling, and thus the reference signal overhead needs to be reduced, which is not considered in the conventional subframe scheduling process.

In the related art, since the reference signal is transmitted in each short time interval, the problem of high overhead of the reference signal is caused, and no effective solution has been proposed.

Disclosure of Invention

The embodiment of the invention provides a method and a device for determining a control channel unit and a storage medium, which at least solve the problem of high expenditure of reference signals caused by the fact that the reference signals are transmitted in each short time interval in the related art.

According to an embodiment of the present invention, there is provided a method for determining a reference signal, including:

indicating that a reference signal exists in at least one TTI in N scheduled Transmission Time Intervals (TTIs) in a preset mode, wherein N is a positive integer.

Optionally, when the position of the reference signal is fixed in the TTI, indicating that the reference signal exists in at least one TTI in N transmission time intervals TTIs by a preset manner includes at least one of the following:

mode one: in N transmission time intervals TTIs, only the first TTI has a reference signal, and the rest TTIs have no reference signal;

mode two: indicating that one TTI where the reference signal is located is contained in the N scheduled TTIs;

mode three: indicating whether each of the N TTIs scheduled contains a reference signal;

Mode four: indicating that the scheduled N TTIs contain at most K TTIs where reference signals are located, wherein K is a positive integer smaller than N;

mode five: indicating whether the reference signal is carried and the position of the reference signal is carried in other TTIs except the first TTI in the N scheduled TTIs, wherein the first TTI always has the reference signal, and indicating whether another TTI contains the reference signal and the position of the other TTI containing the reference signal;

mode six: by indicating the reference signal pattern in N TTIs, wherein,

the reference signal pattern is a set of patterns when the number x of TTIs is scheduled,

or the reference signal pattern simultaneously carries the scheduling TTI number information,

or the reference signal pattern simultaneously carries feedback Acknowledgement (ACK) and Negative Acknowledgement (NACK) timing information.

Optionally, when reference signals exist in 2 or more than 2 TTIs in the N TTIs, the types of the reference signals are the same.

Optionally, when reference signals exist in 2 or more than 2 TTIs in the N TTIs, the types of the reference signals are the same when the types of the TTIs are different.

Optionally, the fifth mode is implemented by one of the following modes:

Indicating the positions of 1 TTI containing the reference signal in the rest TTIs except the first TTI in the N TTIs;

the use of 1bit indicates whether another TTI, except the first TTI, of the N TTIs contains a reference signal.

Optionally, the method further comprises:

when there is another TTI containing the reference signal, the TTI position is fixed at the last of the N TTIs scheduled.

Optionally, in the downlink transmission process, the resources that support the physical downlink shared channel PDSCH to use the physical downlink control channel PDCCH may include at least one of the following cases:

of the N TTIs, only the first TTI supports the PDSCH to use unused resources of the PDCCH;

when N >1, the resource unused by PDCCH is not supported by PDSCH;

when n=1, supporting PDSCH to use resources not used by PDCCH;

among the N TTIs, all TTIs reuse the same PDCCH unused resources as the first TTI.

Optionally, the timing of feeding back ACK/NACK to data carried in N TTIs is determined according to the reference signal position, and the determining method includes at least one of the following ways:

mode 1: when only 1 TTI of the plurality of TTIs contains reference signals, k1 is the timing of the corresponding feedback ACK/NACK when the first TTI contains the reference signals, and k2 is the timing of the corresponding feedback ACK/NACK when the non-first TTI contains the reference signals, k1< k2 is satisfied;

Mode 2: when more than 1 TTI in the plurality of TTIs contains reference signals, k3 is the timing of the corresponding feedback ACK/NACK when the last TTI contains the reference signals, and k4 is the timing of the corresponding feedback ACK/NACK when the last TTI does not contain the reference signals, so that k3> k4 is satisfied;

wherein k1, k2, k3, k4 are positive numbers.

Optionally, when the position of the reference signal is not fixed in the TTI, indicating that the reference signal exists in at least one TTI in N transmission time intervals TTIs by a preset manner, and the reference signal position is not fixed in the TTI, including at least one of the following:

mode one: the method comprises the steps of indicating a reference signal pattern of a first TTI in N TTIs, wherein the reference signal pattern is consistent with a reference signal pattern in single TTI scheduling;

mode two: indicating one TTI in N TTIs and a reference signal pattern in the TTI, wherein the reference signal pattern is consistent with the reference signal pattern when single TTI scheduling is performed;

mode three: indicating reference signal patterns of at most K TTIs in N TTIs, wherein the reference signal patterns are consistent with the reference signal patterns when single TTI scheduling is performed, and K is a positive integer smaller than N;

mode four: by indicating a reference signal pattern for each of the N TTIs, wherein the reference signal pattern is consistent with a reference signal pattern when scheduling for a single TTI;

Mode five: indicating whether the reference signal is carried and the position of the reference signal is carried in other TTIs except the first TTI in the N TTIs of the scheduling, wherein the first TTI always has the reference signal, indicating whether another TTI contains the reference signal and the position of the other TTI containing the reference signal is located and indicating the position of the reference signal in the TTI;

mode six: by indicating the reference signal pattern in N TTIs, wherein,

or the reference signal pattern carries feedback ACK/NACK timing information at the same time;

wherein the position of the reference signal is fixed in the TTI.

Optionally, the fifth mode is implemented by one of the following modes:

indicating the positions of 1 transmission time interval containing the reference signal in the rest transmission time intervals except the first transmission time interval and the positions of the reference signal in the transmission time intervals in the N transmission time intervals;

Indicating whether another transmission time interval, except the first transmission time interval, exists among the N transmission time intervals includes the reference signal and indicating the position of the reference signal in the transmission time interval.

Optionally, the method further comprises:

According to still another embodiment of the present invention, there is provided a method for determining a reference signal, including:

determining that a reference signal exists in at least one transmission time interval in every N transmission time intervals in SPS transmission in a preset mode, wherein N is a positive integer.

Optionally, the time domain position of the reference signal is fixed in a transmission time interval, and the preset manner at least includes one of the following:

mode one: predefining that in every N transmission time intervals, only the first transmission time interval has a reference signal;

mode two: signaling to indicate whether to reduce the reference signal density in every N transmission time intervals, wherein not reducing the reference signal density means that all of the N transmission time intervals contain reference signals, and reducing the reference signal density means that less than N transmission time intervals contain reference signals;

Mode three: the reference signal pattern in every N transmission time intervals is indicated by signaling.

Optionally, the reference signal density is reduced by at least one of: only the first transmission time interval has a reference signal therein; only the first and last transmission time intervals have reference signals in them; only the first and x transmission time intervals offset from the first have reference signals in them, where x is an integer taken from the set 0, n.

Optionally, the time domain position of the reference signal is not fixed in the transmission time interval, and the preset manner at least includes at least one of the following:

mode one: predefining that N transmission time intervals all contain reference signals in every N transmission time intervals;

mode two: predefining that in every N transmission time intervals, only the first transmission time interval has a reference signal;

mode three: signaling to indicate whether to reduce the reference signal density in every N transmission time intervals, wherein not reducing the reference signal density means that all of the N transmission time intervals contain reference signals, and reducing the reference signal density means that less than N transmission time intervals contain reference signals;

mode four: the reference signal pattern in every N transmission time intervals is indicated by signaling.

Optionally, only the first orthogonal frequency division multiplexing OFDM symbol of the transmission time intervals containing the reference signal contains the reference signal in every N transmission time intervals.

Optionally, the transmission time interval in which the first traffic transmission of the SPS transmission is activated contains a reference signal.

Optionally, when the signaling is physical layer signaling, the signaling is valid only in 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 respectively have different meanings when the period is 1 transmission time interval than other periods, wherein the reference signal indication is valid for every N transmission time intervals when the period is 1 transmission time interval and is used for a single transmission time interval reference signal indication when other periods are used.

Optionally, the method is applied to semi-persistent scheduling, SPS, and SPS period is 1 transmission time interval.

According to another embodiment of the present invention, there is also provided a method for determining a semi-persistent scheduling SPS transmission time, including:

indicating SPS period, offset value and transmission time interval length joint coding through high-layer signaling, wherein the transmission time interval length joint coding is carried out with SPS period and offset value; or the SPS period and the offset value are indicated through the high-layer signaling, and meanwhile, the physical layer signaling for activating SPS transmission is positioned at the limited transmission time; or informing the SPS period through a high-layer signaling, and activating the SPS transmission physical layer signaling to be positioned at the limited transmission time, wherein the joint coding indicates the offset value and the transmission time interval length;

determining 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.

Optionally, the limited transmission time is at least one of the following: the method comprises the steps of being located only in a physical downlink control channel (Physical Downlink Control CHannel, abbreviated as PDCCH), being located only in a short transmission time interval #0 and/or a short transmission time interval #3, being located only in a control resource set configured in a time slot, wherein the resource set is located in the first P symbols in the time slot, being located only in the first control resource set in a time domain in a plurality of control resource sets configured in the time slot, wherein the P value comprises: 1,2,3,7.

Optionally, the joint coding includes at least: the SPS period and the offset are indicated in a unified way, and the offset value for each period is the number of SPS periods including 1 short transmission time interval or 1 service duration; or the offset value for each period is smaller than or equal to the number of SPS periods containing 1 short transmission time interval or 1 service duration.

According to another embodiment of the present invention, there is also provided a method for determining a control channel unit, including:

selecting part of the resource unit groups from the N resource unit groups to form a control channel unit, and forming the control channel unit at least by one of the following modes:

for a Physical Downlink Control Channel (PDCCH) based on a demodulation reference signal, when mapping of a Control Channel Element (CCE) and a Resource Element Group (REG) is distributed mapping, at least the following principles are satisfied: m REGs are used as a group to form a CCE in a frequency domain at equal intervals or in a discrete mode, wherein M is the number of REGs contained in K RBs in a TTI, K is a positive integer, and N is a positive integer;

for a Physical Downlink Control Channel (PDCCH) based on a cell reference signal, when mapping of a Control Channel Element (CCE) and a Resource Element Group (REG) is distributed mapping, at least the following principles are satisfied: a set of REGs equally spaced or discrete in space in the frequency domain in a single symbol constitutes one CCE.

Alternatively, when the mapping of the control channel element CCE and the resource element group REGs is a centralized mapping, a group of REGs that are continuous in the frequency domain in a single symbol form one CCE, and an interleaving method or physical layer signaling is used to indicate an aggregation level, or information of different aggregation levels is scrambled differently.

Optionally, when the set of REGs that are equally spaced or discrete in intervals in the frequency domain in a single symbol form a CCE and are used for the short physical downlink control channel sppdcch, the srreg index that forms the scce#n is at least one of the following manners:

mode one:

mode two:

where n=0, …, N _sCCE,p -1 and N _sCCE,p Represents the number of scces in the control channel resource block set p,and->Indicates the number of sREGs contained in each sCCE, </i >>Representing the number of srgs contained in each OFDM symbol in the control channel resource block set p.

Optionally, the interleaving method includes: for a candidate set with the aggregation level of L, sequentially writing REG indexes contained in the candidate set into an interleaver, reading the REG indexes from the interleaver according to a column replacement pattern, and deleting null elements after reading, wherein the null elements are defined when the REG indexes are larger than X;

wherein l=1, 2,4 or 8;

where x=l·m-1, M represents the number of REGs contained in each CCE.

Optionally, the column permutation pattern includes at least one of:

<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>。

according to another embodiment of the present invention, there is also provided a reference signal determining apparatus including:

the first indication module is used for indicating that a reference signal exists in at least one TTI in N scheduled transmission time intervals TTIs in a preset mode, wherein N is a positive integer.

According to another embodiment of the present invention, there is also provided a determining apparatus of a control channel unit, including:

a selecting module, configured to select a part of resource unit groups from the N resource unit groups to form a control channel unit, where at least one of the following modes is used to form a control channel unit:

the first determining module is used for determining that a reference signal exists in at least one transmission time interval in every N transmission time intervals in the semi-persistent scheduling (SPS) transmission in a preset mode, wherein N is a positive integer.

According to another embodiment of the present invention, there is also provided a device for determining a transmission time of a semi-persistent scheduling SPS, including:

the indication module is used for indicating the SPS period, the offset value and the transmission time interval length joint coding through the high-layer signaling joint coding; or the SPS period and the offset value are indicated through the high-layer signaling, and meanwhile, the physical layer signaling for activating SPS transmission is positioned at the limited transmission time; or informing the SPS period through a high-layer signaling, and activating the SPS transmission physical layer signaling to be positioned at the limited transmission time, wherein the joint coding indicates the offset value and the transmission time interval length;

a second determining module, configured to determine the SPS transmission time according to one of the following indications: SPS period, offset value, and transmission time interval length; SPS period and offset value; offset value and transmission time interval length.

According to another embodiment of the present invention, there is also a storage medium including a stored program, wherein the program, when run, performs a method of determining a reference signal or a method of determining a control channel element.

According to the application, since the existence of the reference signal in at least one TTI in the N scheduled transmission time intervals TTI can be indicated in a preset mode, the existence of the reference signal in each TTI in the N transmission time intervals can be indicated, the problem that the cost of the reference signal is high due to the fact that the reference signal is transmitted in each short time interval in the related art is solved, and the cost of the reference signal is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

fig. 1 is a flowchart of a method of determining a reference signal according to an embodiment of the present application;

fig. 2 is a block diagram of a structure of a reference signal determining apparatus according to an embodiment of the present application;

fig. 3 is a flow chart of a method of determining a control channel element according to an embodiment of the present application;

fig. 4 is a block diagram of a configuration of a determining apparatus of a control channel unit according to an embodiment of the present application;

fig. 5 is a schematic diagram of a downlink sTTI structure according to an alternative embodiment of the present application;

Fig. 6 is a schematic diagram of the structure of an uplink sTTI according to an alternative embodiment of the present application;

FIG. 7 is a schematic diagram of a centralized map and a distributed map in accordance with an alternative embodiment of the present application;

FIG. 8 is another schematic diagram of a centralized map and a distributed map in accordance with an alternative embodiment of the present application;

FIG. 9 is yet another flow chart of a method of determining a reference signal according to an embodiment of the present application;

FIG. 10 is a flow chart of a method of determining SPS transmission time according to an embodiment of the present application;

fig. 11 is another block diagram of the structure of the reference signal determining apparatus according to the embodiment of the present application;

fig. 12 is a block diagram of a configuration of a determination apparatus of SPS transmission timing according to an embodiment of the present application.

Detailed Description

The application will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

Example 1

In this embodiment, a method for determining a reference signal is provided, fig. 1 is a flowchart of a method for determining a reference signal according to an embodiment of the present application, and as shown in fig. 1, the flowchart includes the following steps:

Step S102, indicating that a reference signal exists in at least one transmission time interval among N scheduled transmission time intervals in a preset mode, wherein N is a positive integer.

According to the invention, since the existence of the reference signal in at least one TTI in the N scheduled transmission time intervals TTI can be indicated in a preset mode, the existence of the reference signal in each TTI in the N transmission time intervals can be indicated, the problem that the cost of the reference signal is high due to the fact that the reference signal is transmitted in each short time interval in the related art is solved, and the cost of the reference signal is reduced.

Although the embodiment of the invention limits that the reference signal exists in at least one TTI in the N transmission time intervals TTIs, in order to better solve the technical problem, the at least one TTI is indicated by a preset manner, and the reference signal exists in less than or equal to the N TTIs.

Optionally, when the position of the reference signal is fixed in the TTI, indicating that the reference signal exists in at least one TTI in N transmission time intervals by a preset manner, including at least one of the following:

mode six: by indicating the reference signal pattern in N TTIs, wherein,

or the reference signal pattern carries feedback ACK/NACK timing information at the same time.

It should be noted that, the implementation manners from the first mode to the sixth mode may be applied to the downlink transmission process, or may be applied to the uplink transmission process, which is not limited by the embodiment of the present invention. The first to sixth preferred modes are for a scenario in which the reference signal position is fixed in the TTI.

Optionally, when reference signals exist in 2 or more than 2 TTIs in the N TTIs, the types of the reference signals are the same when the types of the TTIs are different, and in the embodiment of the present invention, the types of the TTIs are different subframe types, such as MBSFN subframes and non-MBSFN subframes; or the TTI type is different time slot types, such as a slot formed by a pure downlink slot, a pure uplink slot, a downlink part, a reserved part and an uplink part.

Optionally, the fifth mode is implemented by one of the following modes:

the 1bit is used to indicate whether another TTI of the N TTIs, except for the first TTI, contains a reference signal, and when another TTI contains a reference signal, the TTI position is fixed at the last of the N TTIs scheduled.

Optionally, the unused resources supporting the use of the physical downlink control channel PDCCH (sppdcch) by the physical downlink shared channel PDSCH (also understood to be the short sppdsch) include at least one of the following:

When N >1, the resource unused by PDCCH is not supported by PDSCH;

when n=1, supporting PDSCH to use resources not used by PDCCH;

wherein k1, k2, k3, k4 are positive numbers.

Optionally, when the position of the reference signal is not fixed in the TTI, indicating that the reference signal exists in at least one TTI in N transmission time intervals TTIs by a preset manner, including at least one of the following:

mode six: by indicating the reference signal pattern in N TTIs, wherein,

It should be noted that, the implementation manners from the first mode to the sixth mode may be applied to an uplink transmission process, or may be applied to a downlink transmission process, which is not limited by the embodiment of the present invention. The preferred modes one to six are for a scenario in which the reference signal position is not fixed in the TTI.

Optionally, when reference signals exist in 2 or more than 2 TTIs in the N TTIs, the types of the reference signals are the same when the types of the TTIs are different, wherein the types of the TTIs are different subframe types, such as MBSFN subframes and non-MBSFN subframes; or the TTI type is different time slot types, such as a slot formed by a pure downlink slot, a pure uplink slot, a downlink part, a reserved part and an uplink part.

Optionally, the fifth mode is implemented by one of the following modes:

Preferably, 1bit is used to indicate whether another transmission time interval of the N transmission time intervals contains the reference signal and indicates the position of the reference signal in the transmission time interval, except for the first transmission time interval.

Optionally, the method further comprises:

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.

Example 2

The embodiment also provides a device for determining a reference signal, which is used for implementing the above embodiment and the preferred implementation, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

Fig. 2 is a block diagram of a reference signal determining apparatus according to an embodiment of the present invention, as shown in fig. 2, including:

the first indication module 20 is configured to indicate that a reference signal exists in at least one TTI among the N scheduled transmission time intervals TTIs in a preset manner, where N is a positive integer.

In an alternative embodiment, the first indication module 20 is further configured to perform at least one of the following operations:

when the position of the reference signal is fixed in the TTI, indicating that the reference signal exists in at least one TTI in N Transmission Time Intervals (TTI) by a preset mode, wherein the method comprises at least one of the following steps:

mode six: by indicating the reference signal pattern in N TTIs, wherein,

or the reference signal pattern carries feedback ACK/NACK timing at the same time.

Optionally, the fifth mode is implemented by one of the following modes:

Optionally, during downlink transmission, the unused resources supporting the physical downlink shared channel PDSCH (also understood to be the short sPDSCH) using the physical downlink control channel PDCCH (spdcc) include at least one of the following:

when N >1, the resource unused by PDCCH is not supported by PDSCH;

when n=1, supporting PDSCH to use resources not used by PDCCH;

wherein k1, k2, k3, k4 are positive numbers.

Mode five: indicating whether the reference signal is carried and the position of the reference signal is carried in other TTIs except the first TTI in the N scheduled TTIs, wherein the first TTI always has the reference signal, and indicating whether another TTI contains the reference signal, the position of the other TTI containing the reference signal and the position of the other TTI in the TTI;

mode six: by indicating the reference signal pattern in N TTIs, wherein,

Optionally, the fifth mode is implemented by one of the following modes:

Optionally, the method further comprises:

It should be noted that, the implementation manners of the first to fifth modes may be applied to the downlink transmission process or the uplink transmission process, which is not limited by the embodiment of the present invention.

Example 3

In an embodiment of the present invention, there is further provided a method for determining a control channel unit, and fig. 3 is a flowchart of a method for determining a control channel unit according to an embodiment of the present invention, as shown in fig. 3, where the flowchart includes the following steps:

step S302, selecting part of resource unit groups from N resource unit groups to form a control channel unit, and forming a control channel unit at least by one of the following modes:

Through the above steps, a part of resource unit groups are selected from the N resource unit groups to form a control channel unit by adopting the method of step S302, so that a determination scheme of the control channel unit can be provided for the physical downlink control channel PDCCH based on the demodulation reference signal and the physical downlink control channel PDCCH based on the cell reference signal respectively.

Wherein, K is preferably selected to be 1,2 and 3.

Alternatively, when the mapping of the control channel element CCE and the resource element group REGs is a centralized mapping, a group of REGs that are continuous in the frequency domain in a single symbol forms one CCE, and in order to avoid that REG resources used by a high aggregation level completely contain REG resources used by a low aggregation level, an interleaving method or physical layer signaling is adopted to indicate an aggregation level, or information of different aggregation levels is scrambled differently.

In an embodiment of the present invention, the interleaving method includes: for a candidate set with an aggregation level of L, the REG indexes contained in the candidate set are sequentially written into the interleaver, read out from the interleaver according to a column replacement pattern, and null elements are deleted after the reading out, wherein the REG indexes are defined as null elements when being larger than X,

wherein l=1, 2,4 or 8, i.e. L may take one of the values 1,2,4, 8;

where x=l·m-1, M represents the number of REGs contained in each CCE.

Optionally, the column permutation pattern includes at least one of:

example 4

The embodiment also provides a device for determining a control channel unit, which is used for implementing the foregoing embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

Fig. 4 is a block diagram of a control channel unit determining apparatus according to an embodiment of the present invention, as shown in fig. 4, including:

a selecting module 40, configured to select a part of the resource unit groups from the N resource unit groups to form a control channel unit, at least by one of the following manners:

By adopting the technical scheme, partial resource unit groups in the N resource unit groups are selected to form one control channel unit in the mode, and further a determination scheme of the control channel unit can be provided for the physical downlink control channel PDCCH based on the demodulation reference signal and the physical downlink control channel PDCCH based on the cell reference signal respectively.

Example 5

According to an embodiment of the present invention, there is further provided a method for determining a reference signal, as shown in fig. 9, fig. 9 is a further flowchart of the method for determining a reference signal according to an embodiment of the present invention, as shown in fig. 9, including:

Step S902: determining that a reference signal exists in at least one transmission time interval in every N transmission time intervals in SPS transmission in a preset mode, wherein N is a positive integer.

It should be noted that, in the preferred embodiment of the present invention, the N preference value is 2.

mode three: indicating by signalling whether the reference signal density is reduced in every N transmission time intervals, wherein not reducing the reference signal density means that the N transmission time intervals all contain reference signals, and reducing the reference signal density means that the N transmission time intervals contain reference signals, preferably by 1bit signalling, indicates whether the reference signal density is reduced in every N transmission time intervals;

Example 6

In an embodiment of the present invention, there is further provided a method for determining SPS transmission time in semi-persistent scheduling, and fig. 10 is a flowchart of a method for determining SPS transmission time according to an embodiment of the present invention, as shown in fig. 10, including:

step S1002, SPS period, offset value and transmission time interval length are indicated by high layer signaling, wherein the transmission time interval length is coded in combination with SPS period and offset value; or the SPS period and the offset value are indicated through the high-layer signaling, and meanwhile, the physical layer signaling for activating SPS transmission is positioned at the limited transmission time; or informing the SPS period through a high-layer signaling, and activating the SPS transmission physical layer signaling to be positioned at the limited transmission time, wherein the joint coding indicates the offset value and the transmission time interval length;

Step S1004, determining the SPS transmission time by one of the following obtained instructions: SPS period, offset value, and transmission time interval length; SPS period and offset value; offset value and transmission time interval length.

Optionally, the limited transmission time is at least one of the following: the method comprises the steps of locating a control resource set configured in a time slot (slot) only in a PDCCH (physical downlink control channel), locating only in a short transmission time interval sTTI#0 and/or a short transmission time interval sTTI#3 (namely, sTTI with index values of 0 and 3), locating the control resource set in the first P symbols in the time slot only in the first resource set in the time domain in a plurality of control resource sets configured in the time slot only, wherein the P values comprise: 1,2,3,7, i.e. the possible value of P is one of 1,2,3, 7.

Example 7

Fig. 11 is another block diagram of the structure of the reference signal determining apparatus according to the embodiment of the present invention, as shown in fig. 11, the apparatus includes:

a first determining module 1102 is configured to determine, by a preset manner, that a reference signal exists in at least one transmission time interval among every N transmission time intervals in semi-persistent scheduling SPS transmission, where N is a positive integer.

Optionally, in every N transmission time intervals, only the first orthogonal frequency division multiplexing OFDM symbol in each transmission time interval contains the reference signal.

Example 8

The embodiment also provides a device for determining the SPS transmission time, which is used to implement the foregoing embodiments and the preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

Fig. 12 is a block diagram of a configuration of an apparatus for determining an SPS transmission timing according to an embodiment of the present invention, as shown in fig. 12, the apparatus including:

an indication module 1202, configured to indicate SPS period, offset value, and transmission time interval length joint coding by high layer signaling joint coding; or the SPS period and the offset value are indicated through the high-layer signaling, and meanwhile, the physical layer signaling for activating SPS transmission is positioned at the limited transmission time; or informing the SPS period through a high-layer signaling, and activating the SPS transmission physical layer signaling to be positioned at the limited transmission time, wherein the joint coding indicates the offset value and the transmission time interval length;

a second determining module 1204, configured to determine the SPS transmission time by indicating one of the following: SPS period, offset value, and transmission time interval length; SPS period and offset value; offset value and transmission time interval length.

The above technical solutions are explained below in connection with preferred embodiments 1 to 5, but are not intended to limit the technical solutions of the embodiments of the present invention.

Preferred embodiment 1

The base station schedules the terminal A to transmit downlink data in a plurality of TTIs. The TTI preferably contains a small number of OFDM symbols, e.g., no more than 7 OFDM symbols, but is not limited thereto. The embodiment is described with reference to a short TTI structure in a Long-Term Evolution (LTE) system, that is, the TTI may be understood as a short TTI (sTTI), but is not limited thereto. DL short TTI frame structure as shown in fig. 5, 6 DL (downlink) short TTIs are contained in a 1ms subframe, pattern1 is used when the sPDSCH is configured to start from OFDM symbol #1 or # 3; when the sPDSCH is configured to start from OFDM symbol #2, pattern2 is used. Note that here the OFDM symbol numbers start from 0, i.e. there are 14 OFDM in a 1ms subframe, with sequential numbers #0 to #13.

DCI for scheduling multiple sTTIs can be transmitted in any DL sTTI, and when the DCI is positioned in DL sTTI#0, the DCI is carried by a PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sppdcch channel. Alternatively, DCI scheduling multiple sTTI may be transmitted in a partial sTTI, e.g., only in DL stti#0, and also, e.g., only in DL stti#0, 3.

When scheduling multiple sTTI transmissions, N sTTI transmissions are maximally scheduled. Where N consecutive sTTI are available for transmission of the sPDSCH. It should be noted that there is a scenario where the sPDSCH cannot be used for sPDSCH transmission in the stti#0, i.e., when the sPDSCH is configured to start from the OFDM symbol #2 or # 3. Preferably, n=2 or 3 or 4 or 6 or 8 or 12 or 16, but not limited thereto. When the maximum scheduled N sTTI transmissions are determined, the number of actually scheduled transmissions for the plurality of sTTI is 1 to N sTTI. The determination mode of the N value is predefined or the value of the higher-layer signaling configuration. The following description will take n=4 as an example, and is not limited thereto.

In the scheduled n=4 DL sTTI transmissions, the location of the demodulation reference signal (Demodulation Reference Signal, abbreviated as DMRS, also referred to as the reference signal in the above embodiment) is determined in at least one of the following manners: although the present embodiment is described with reference to downlink transmission, the method for determining the location of the DMRS is not limited to downlink, but may be used in uplink. In this embodiment, a scenario in which DMRS is fixed in TTI is preferable.

Mode 1: default that DMRS is present in each sTTI;

the beneficial effects are that: no additional indication is needed at this point. Without standardization, the multi-sTTI scheduling mechanism is the same as the eLAA multi-subframe scheduling mechanism. The proportion of the overhead of the DMRS is the same as that of the single sTTI scheduling, and no saving is caused.

Mode 2: default only has DMRS in the first sTTI scheduled, and there is no DMRS in the rest sTTIs;

the beneficial effects are that: no additional indication is needed at this point. The DMRS overhead can be saved, and the standardization is simple. The method is suitable for non-high-speed moving scenes.

Mode 3: only 1 sTTI where the DMRS is contained in the N scheduled sTTIs is indicated;

at this time, the sTTI containing the DMRS is located in any one of the scheduled sTTI, taking n=4 as an example, if only 1 sTTI is considered to contain the DMRS, 2 bits indicate one of the 4 sTTI;

the beneficial effects are that: DMRS overhead may be saved, flexible indication of the sTTI containing the DMRS is not limited to only the first of the multiple sTTI.

Mode 4: indicating that the N scheduled sTTIs contain at most N sTTIs where the DMRS is located;

at this time, the sTTI containing the DMRS is located at any position in the scheduled multiple sTTI, and at most N sTTI contain the DMRS, taking n=4 as an example, 4 bits indicate that at most 4 sTTI contain the DMRS in a bitmap manner;

the beneficial effects are that: DMRS overhead can be saved and the indication overhead is the largest but the most flexible, the sTTI containing DMRS can be located at any position and up to N sTTI all contain DMRS.

Mode 5: only indicating at most 2 sTTIs where the DMRS is located in the scheduled multiple sTTIs;

at this time, it is indicated that at most 2 sTTI of the N sTTI contain DMRS. For example when n=4, a total of 10 possible 4bit indications are required at this timeThere are 1 sTTI containing DMRS (4 possibilities) or 2 sTTI containing DMRS (6 possibilities). Also for example when n=6, a total of 21 possible +.>There are 1 sTTI containing DMRS (6 possibilities) or 2 sTTI containing DMRS (15 possibilities).

The beneficial effects are that: flexible indication sTTIs containing DMRS, at most in any 2 sTTIs, indicates overhead equal to or less than mode 4.

Mode 6: indicating whether DMRS and positions are carried in the rest of the scheduled N stttis except the first sTTI. Default that the first sTTI always has DMRS indicates whether another sTTI contains DMRS and where another sTTI containing DMRS is located.

Mode 6 further includes: sub-mode 6-1 and sub-mode 6-2, wherein sub-mode 6-1: the indication includes 1 sTTI in the remaining sTTI except the first sTTI. For example, when n=4, as shown in table 1 below, 2bits are used to indicate whether another sTTI contains DMRS and where another sTTI containing DMRS is located.

TABLE 1

2bits indication	Whether or not the remaining sTTIs include DMRS and location
		00	No remaining sTTI contains DMRS
01	The second sTTI comprises DMRS
		10	The third sTTI comprises DMRS
11	The fourth sTTI comprises DMRS

Sub-mode 6-2: the use of 1bit indicates whether another sTTI contains DMRS. Preferably, when another sTTI contains a DMRS, the sTTI position is fixed at the last of the scheduled plurality of sTTI.

The beneficial effects are that: DMRS overhead may be saved, supporting another sTTI to contain DMRS with a smaller indication overhead. The method is suitable for medium-low speed moving scenes and high-speed moving scenes. For example: except for the high-speed scenario, it is enough that only a single sTTI contains DMRS in the rest of the cases, i.e., the main reason that another sTTI contains DMRS is to support the high-speed mobile scenario.

Mode 7: one of the predefined DMRS patterns is indicated. Wherein the predefined DMRS pattern is defined separately for the actual number of scheduled multi-sTTI scheduling, or the predefined DMRS pattern is jointly coded with the number of scheduled sTTI.

The predefined DMRS pattern defines examples for the actual number of scheduled multi-sTTI scheduling, respectively: when n=4, the actual number of schedules for up to n=4 sTTI schedules is n=1 or 2 or 3 or 4. As shown in table 2 below, when the actual scheduling number sTTI is different, the predefined DMRS pattern sets are defined separately, and according to the actual scheduling number sTTI, the position of the sTTI where the DMRS is located when the actual scheduling of n sTTI is indicated, i.e. one of the predefined DMRS pattern sets. It should be noted that the pilot patterns listed in the table are only examples, but not limited thereto.

TABLE 2

Note: r indicates that the sTTI has DMRS, and D indicates that the sTTI has no DMRS. Taking n=2 as an example, RD indicates that the first sTTI has DMRS and the second sTTI has no DMRS. The rest is similar and will not be described in detail.

The predefined DMRS pattern and the number of scheduled sTTI are joint coding examples: when n=4, the actual number of schedules for up to n=4 sTTI schedules is n=1 or 2 or 3 or 4. As shown in table 3, at different actual scheduling numbers sTTI, the predefined DMRS pattern set is joint with the scheduled number of sTTI, indicating one of the number of actually scheduled sTTI and the sTTI position where the DMRS is located, i.e. the predefined DMRS pattern set. It should be noted that the pilot patterns listed in the table are only examples, but not limited thereto.

TABLE 3 Table 3

The beneficial effects are that: the DMRS overhead can be saved, another sTTI is supported to contain DMRS with smaller indication overhead, and a multi-sTTI pilot pattern suitable for multi-sTTI scheduling can be designed. The method is suitable for medium-low speed moving scenes and high-speed moving scenes. And joint coding indications may further save control overhead.

In addition, for DL multi-sTTI scheduling, the manner of supporting the sPDSCH to use the spdcc unused resources includes at least one of the following manners:

mode 1: when scheduling in multiple sTTI, only the first sTTI supports the use of resources not used by the sppdcch by the sPDSCH.

Considering that the single sTTI scheduling supports the use of the resources unused by the sPDSCH, the function can only be supported for the current sTTI, and the use condition of the spdch resources in the subsequent sTTI cannot be predicted, and meanwhile, each sPDSCH scheduled by multiple sTTI is independently coded. It is therefore possible to work with only the first sTTI supporting this function. Thus, when displaying the indication, the unused/used sCCE indication field is valid only for the first sTTI of the multiple sTTI. That is, in the multi-sTTI scheduling, only the first sTTI supports the use of resources not used by the sppdcch by the sPDSCH.

Mode 2: this function is not supported when multi-sTTI scheduling.

I.e. the unused sps pdcch resources are reused by the sPDSCH scheduled by a single sTTI.

Mode 3: when multiple sTTIs are scheduled, all sTTIs reuse the same unused sCCE resources as in the first sTTI.

The limitations that exist at this time are: the sCCE index used by the scch in the same RB set in the subsequent sTTI cannot be larger than the sCCE index used by the scch scheduled by the multiple sTTI in the first sTTI.

Additionally, for multi-TTI scheduling, the feedback timing is implicitly determined from the DMRS position. The feedback timing is a timing of ACK/NACK for PDSCH or PUSCH. Determining feedback timing of the multi-sTTI scheduling service according to the sTTI position including the DMRS in the multi-sTTI includes at least one of:

Mode 1: when only 1 TTI in the plurality of TTIs contains the DMRS, the timing of the corresponding feedback ACK/NACK when the first sTTI contains the DMRS is assumed to be k1, and the timing of the corresponding feedback ACK/NACK when the non-first sTTI contains the DMRS is assumed to be k2, wherein k1 is less than k2;

mode 2: when more than 1 TTI in the plurality of TTIs contains the DMRS, the timing of the corresponding feedback ACK/NACK when the last sTTI contains the DMRS is assumed to be k3, and the timing of the corresponding feedback ACK/NACK when the last sTTI does not contain the DMRS is assumed to be k4, wherein k3 is more than k4;

by the technical scheme provided by the preferred embodiment, the DMRS overhead can be saved when multi-sTTI scheduling is realized, and the small indication overhead indicates that one or more sTTIs are supported to contain the DMRS, so that the method is suitable for medium-low speed moving scenes and high-speed moving scenes. Meanwhile, after the expenditure of pilot frequency is saved, more resources can be used for data transmission, and the system spectrum efficiency is improved.

Preferred embodiment 2

The base station schedules the terminal a to transmit uplink data in a plurality of TTIs containing a small number of OFDM symbols, e.g. no more than 7 OFDM symbols. The preferred embodiment is illustrated with a short TTI structure in an LTE system, but is not limited thereto. UL short TTI frame structure as shown in fig. 6, 6 UL (Up Link) short TTIs are contained in a 1ms subframe. Note that here the OFDM symbol numbers start from 0, i.e. there are 14 OFDM in a 1ms subframe, with sequential numbers #0 to #13.

When scheduling multiple sTTI transmissions, N sTTI transmissions are maximally scheduled. Where N consecutive sTTI are available for transmission of the sps. Preferably, n=2 or 3 or 4 or 6 or 8, but not limited thereto. When the maximum scheduled N sTTI transmissions are determined, the number of actually scheduled transmissions for the plurality of sTTI is 1 to N sTTI. The determination mode of the N value is predefined or the value of the higher-layer signaling configuration. The following description will take n=4 as an example, and is not limited thereto.

In the scheduled n=4 UL sTTI transmissions, the location of the DMRS is determined in at least one of the following manners: although the present embodiment is described with reference to uplink transmission, the method for determining the location of the DMRS is not limited to uplink, but may be used in downlink. The present embodiment is preferably directed to a scenario in which the DMRS is not fixed in the TTI.

Mode 1: the DMRS pattern is the same as the DMRS pattern when scheduling in a single sTTI, and the manner of indicating UL DMRS is the same as that in a single sTTI. At this time, only the DMRS pattern in the first sTTI of the schedule is indicated, and the subsequent sTTI is not indicated. The constraint here is that the first sTTI cannot indicate pure D pattern and |r pattern, and that the pattern containing R must be indicated.

It should be noted that the UL DMRS pattern at the time of single-sTTI scheduling is shown in table 4: the UL DMRS patterns included include at least the patterns listed in table 1, and other patterns may also be included.

TABLE 4 UL DMRS position at Single sTTI scheduling

It should be noted that: in table 4 "|" indicates the boundary of sTTI n.

The beneficial effects are that: this approach does not require the design of a new pattern structure, i.e., either pattern or single-sTTI scheduling. The control overhead is not increased. The multiple UL sTTI scheduled simultaneously have no DMRS except for the first one.

Mode 2: and when the DMRS pattern is same as the single sTTI scheduling, the bit domain is same as the single sTTI, and sTTI position indication containing the DMRS is increased. At this time, only the DMRS pattern in one sTTI containing the DMRS is indicated, and the rest sTTI are not indicated. The limitation is that the indicated sTTI cannot indicate pure D pattern and |r pattern, and the pattern containing R must be indicated.

The beneficial effects are that: this approach does not require the design of a new pattern structure, i.e., either pattern or single-sTTI scheduling. Flexible indication of locations containing DMRS is supported. Only one of the UL sTTI scheduled simultaneously contains DMRS.

Mode 3: the DMRS pattern is identical to the DMRS pattern when single sTTI scheduling, the bit domain is N times that of single sTTI, and each sTTI is independently indicated. For example, when n=4, the bit field indicates 4 times the DMRS position when scheduling for a single sTTI. At this time, the DMRS corresponding to each sTTI actually scheduled is indicated. The method is most flexible and the cost is maximum. For example, n=2 sTTI is actually scheduled, and it is assumed that the bit field indicating UL DMRS position is 2bits when scheduling is performed in a single sTTI, and at this time, the bit field for multi-sTTI scheduling is 8bits, and at this time, because the number of UL sTTI actually scheduled is 2, the first 4 bits in 8bits are valid. The first 2bits of the effective 4 bits indicate UL DMRS position in the first UL tti of the schedule, and the second 2bits indicate UL DMRS position in the second tti of the schedule.

The beneficial effects are that: the method does not need to design a new pattern structure, namely the pattern structure or the structure when single sTTI scheduling is carried out, and simultaneously supports flexible indication with larger control overhead.

Mode 4: indicating whether DMRS and positions are carried in the rest of the scheduled N stttis except the first sTTI. Default that the first sTTI always has DMRS, indicating whether another sTTI contains DMRS and another sTTI containing DMRS is located, and indicating the symbol location of DMRS in the sTTI. The symbol position of the DMRS in one sTTI is indicated to be the same as the DMRS position indication method in single sTTI scheduling.

Mode 4 further includes: sub-mode 4-1 and sub-mode 4-2, wherein sub-mode 4-1: the indication comprises 1 sTTI in the rest sTTIs except the first sTTI, and the symbol position of the DMRS in the sTTI is indicated. The symbol position of the DMRS in one sTTI is indicated to be the same as the DMRS position indication method in single sTTI scheduling. For example, when n=4, as shown in table 1 below, 2bits are used to indicate whether another sTTI contains DMRS and where another sTTI containing DMRS is located.

TABLE 1

Sub-mode 4-2: indicating whether another sTTI contains the DMRS or not and indicating the symbol position of the DMRS in the sTTI. Preferably, when another sTTI contains a DMRS, the sTTI position is fixed at the last of the scheduled plurality of sTTI. Wherein indicating the presence or absence of another sTTI includes DMRS preferably using 1bit for indication. The symbol position of the DMRS in one sTTI is indicated to be the same as the DMRS position indication method in single sTTI scheduling.

The beneficial effects are that: DMRS overhead may be saved, supporting another sTTI to contain DMRS with a smaller indication overhead. The method is suitable for medium-low speed moving scenes and high-speed moving scenes.

Mode 5: one of the predefined DMRS patterns is indicated. Wherein the predefined DMRS pattern is defined separately for the actual number of scheduled multi-sTTI scheduling, or the predefined DMRS pattern is jointly coded with the number of scheduled sTTI.

I.e. predefining UL DMRS patterns at multi-sTTI scheduling and determining specific patterns at multi-sTTI scheduling. Predefined consecutive 2,3,..dmrs pattern at N sTTI scheduling. When n=4, a DMRS pattern of consecutive 2,3,4 sTTI scheduling is predefined.

When the pattern is unique when 2,3, & gt, N sTTI schedules are consecutive, respectively, there is no need to indicate when the pattern is multiple when 2,3, & gt, N sTTI schedules are consecutive, respectively, one of them is indicated.

The predefined DMRS pattern defines examples for the actual number of scheduled multi-sTTI scheduling, respectively: as shown in table 5, n=4, and n=1, 2,3,4 sTTI are scheduled consecutively for predefined pilot pattern candidate sets, respectively. And determining the meaning of the 2bits indication according to the number n of the continuously scheduled sTTIs, and indicating one pattern. It should be noted that the pilot patterns listed in the table are only examples, but not limited thereto.

TABLE 5

It should be noted that: when 3OS, DR corresponds to DDR and RD corresponds to RDD. Taking n=2 as an example, rd|dd indicates that the first sTTI has DMRS and is located in the first symbol in the first sTTI, and the second sTTI has no DMRS. The rest is similar and will not be described in detail.

The predefined DMRS pattern and the number of scheduled sTTI are joint coding examples: when n=4, the actual number of schedules for up to n=4 sTTI schedules is n=1 or 2 or 3 or 4. As shown in table 6, at different actual scheduling numbers sTTI, the predefined DMRS pattern set is joint with the scheduled number of sTTI, indicating one of the number of actually scheduled sTTI and the sTTI position where the DMRS is located, i.e. the predefined DMRS pattern set. It should be noted that the pilot patterns listed in the table are only examples, but not limited thereto.

TABLE 6

The beneficial effects are that: this approach has less control overhead. And a DMRS pattern structure for a plurality of stttis needs to be designed. And joint coding indications may further save control overhead.

By the method provided in the preferred embodiment 2, it is possible to achieve DMRS overhead saving in multi-sTTI scheduling, and support of one or more sTTI containing DMRS with smaller indication overhead indication, so as to be applicable to medium-low speed mobile scenarios and high-speed mobile scenarios. Meanwhile, after the expenditure of pilot frequency is saved, more resources can be used for data transmission, and the system spectrum efficiency is improved.

Example 3

The base station schedules the terminal a to transmit downlink data in a single TTI or in multiple TTIs that contain a small number of OFDM symbols, e.g., no more than 7 OFDM symbols. The preferred embodiment 3 is described with a short TTI structure in the LTE system, but is not limited thereto. DL short TTI frame structure as shown in fig. 5, 6 DL (downlink) short TTIs are contained in a 1ms subframe, pattern1 is used when the sPDSCH is configured to start from OFDM symbol #1 or # 3; when the sPDSCH is configured to start from OFDM symbol #2, pattern2 is used. Note that here the OFDM symbol numbers start from 0, i.e. there are 14 OFDM in a 1ms subframe, with sequential numbers #0 to #13.

DCI of scheduling single TTI or multiple TTIs can be transmitted in any DL sTTI, and when the DCI is positioned in DL sTTI#0, the DCI is carried by a PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sppdcch channel. Alternatively, DCI scheduling multiple sTTI may be transmitted in a partial sTTI, e.g., only in DL stti#0, and also, e.g., only in DL stti#0, 3.

CRS-based sPDCCH and DMRS-based sPDCCH are supported in sTTI at the same time, and both types of sPDCCH support centralized mapping and distributed mapping. For CRS-based scch, both centralized and distributed mapping support frequency-first time-second sCCE-to-srg mapping. For DMRS-based scch, both the centralized mapping and the distributed mapping support time-first frequency-second sCCE-to-srreg mapping (a mapping manner of time first frequency second). And the sREG numbering order is: for CRS-based spdcc, the srg numbering order is frequency-first time-second (frequency first time second); for DMRS-based sPDCCH, the sREG numbering sequence is time-first frequency-second.

Therefore, under these conditions, a specific scheme and formula for sCCE-to-sREG mapping needs to be determined.

For sTTI #1-5, the RB set where the CRS-based sps pdcch is located supports 1 or 2 OFDM symbols, and one of them is configured by higher layer signaling. The number of OFDM symbols of the RB set of the DMRS-based sPDCCH is the same as the number of OFDM symbols of the sTTI, namely, 2 or 3 OFDM symbols are supported.

For DMRS-based sps pdcch, assume configured RB set _Xm The number of PRBs contained is N _PRB PRBs, configured by higher layer signaling. The number of OFDM symbols is N _OFDM The number of OFDM symbols is the same as the number of OFDM symbols contained in the sTTI. One sREG is known as 1RB in one OFDM symbol, i.e., 12 REs (including pilot), so the number of sREGs is N _sREG ＝N _PRB ·N _OFDM . In the following descriptionRepresents the number of sREGs that one sCCE contains.

In the case of centralized mapping, the following principles are satisfied: by N _OFDM The sREGs are a group of sCCEs that are consecutively formed in the frequency domain. sREG#m contained in sCCE#n satisfies the formulaOr sCCE#n contains sREG number +.>Wherein->

In the case of distributed mapping, the following principles are satisfied: by N _OFDM The sREGs are a group of sCCEs which are formed by equally and discretely separating in the frequency domain. sREG#m contained in sCCE#n satisfies the formulaOr sCCE#n contains sREG number +.>Wherein->v＝0,1,...,N _OFDM -1，

By N _OFDM ＝2,For example, when N _PRB When 12PRBs are included, a schematic diagram of the centralized mapping and the distributed mapping is shown in fig. 7.

For CRS-based sps pdcch, configured RB set X is assumed _m The number of PRBs contained is N _PRB PRBs, configured by higher layer signaling. The number of OFDM symbols is N _OFDM OFDM symbols, configured by higher layer signaling. One sREG is known as 1RB in one OFDM symbol, i.e., 12 REs (including pilot), so the number of sREGs is N _sREG ＝N _PRB ·N _OFDM . In the following descriptionRepresents the number of sREGs that one sCCE contains.

In the case of centralized mapping, the following principles are satisfied: a group of srgs that are contiguous in the frequency domain in a single symbol constitute one sCCE. sREG#m contained in sCCE#n satisfies the formulaOr sREG number contained in sCCE#n isWherein (1)>

In the case of distributed mapping, the following principles are satisfied: a group of srgs that are equally spaced apart in the frequency domain in a single symbol constitute one sCCE. The sREG#m contained in the sCCE#n satisfies at least one of the following formulas:

equation 1:

equation 2:

equation 3:

when (when)When (I)>m≤N _sREG /N _OFDM ；

When (when)In the time-course of which the first and second contact surfaces,

m＞N _sREG /N _OFDM ；

equation 4:

equation 5:

equation 6:

equation 7:

equation 8:

equation 9:

or the sREG number contained in the sCCE#n is at least one of the following formulas:

equation 1:

wherein (1)>

Equation 2:

wherein (1)>

Equation 3:

wherein n=0, …, N _sCCE,p -1 and N _sCCE,p Representing the number of scces in the control channel resource block set p.And->The number of sREGs contained in each sCCE is represented.Representing the number of srgs contained in each OFDM symbol in the control channel resource block set p. Since 1 sREG is 1 RB in 1 OFDM symbolEquation 3 applies to the number of RBs in RB set being an arbitrary value. It is particularly noted that the intermediate term in formula 3 cannot be written as +. >Since the number of RBs is not +.>When an integer multiple of (1) is usedThis results in one sCCE that should have been mapped to the second symbol still being mapped to the first symbol, which in turn results in the same srg for two scces of different index, which in turn results in ambiguity and misinterpretation, for example: n (N) _PRB ＝18PRBs，N _OFDM ＝2,When n=4, the srgs are the same as the srgs corresponding to n=0, and are srg#0, 4,8,12. While this ambiguity and misinterpretation does not occur in equation 3, n=0 corresponds to srg#0, 4,8,12, n=4 corresponds to srg# 18,22,26,30.

Equation 4:

where n=0, …, N _sCCE,p -1 and N _sCCE,p Representing the number of scces in the control channel resource block set p.And->The number of sREGs contained in each sCCE is represented.Representing the number of srgs contained in each OFDM symbol in the control channel resource block set p. Since 1 sREG is 1 RB in 1 OFDM symbolAnd equation 4 applies only to the number of RBs in RB set is +.>Is an integer multiple of (a).

By N _OFDM ＝2,For example, when N _PRB When=16 PRBs, a schematic diagram of the centralized mapping and the distributed mapping is shown in fig. 8.

Or in the case of distributed mapping, the following principles are satisfied: the sREGs selected at equal intervals among all numbered sREGs constitute one sCCE. sREG#m contained in sCCE#n satisfies the formula asOr (b) Or sCCE#n contains sREG number +.>Or->Wherein->

Meanwhile, when the mapping of the control channel element CCE and the resource element group REG is a centralized mapping, a group of REGs continuous in the frequency domain in a single symbol form a CCE, and in order to avoid that REG resources used by a high aggregation level completely contain REG resources used by a low aggregation level, misunderstanding of different aggregation levels is caused, an interleaving method or physical layer signaling is adopted to indicate the aggregation levels or different scrambling is performed on information of different aggregation levels. In the description, when used for the sPDCCH channel, CCEs correspond to sCCEs, and REGs correspond to sREGs.

When the aggregation level L is indicated by physical layer signaling, i.e. the used aggregation level is indicated directly in the DCI, e.g. one of l=1, 2, 4, 8 is indicated using 2 bits. For use in terminal verification. Misunderstanding between different aggregation levels is avoided.

By differently scrambling information of different aggregation levels: one preferred method is to scramble the CRC with different masks, e.g. l=1, 2, 4, 8, respectively, for different aggregation levels<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>、<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1>、<0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0>、<0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1>. Another preferred method is to scramble the dci+crc information, or dci+crc encoded information, or rate matched information using a scrambling sequence, e.g Where b (i) is pre-scrambling information and c (i) is a scrambling sequence (preferably generated using pseudo-random sequences of Gold sequences of length 31 for LTE systems), where the initial values of the scrambling sequences are distinguished using different aggregation levels (e.g. c _init ＝L)。

For the adoption of the interleaving method: for a candidate set with aggregation level L, the REG indexes contained in the candidate set are sequentially written into the interleaver, read out from the interleaver according to the column replacement pattern, and null elements are deleted after the reading out. Wherein the REG index is defined as a null element when it is greater than X.

Where l=1, 2,4 or 8.

Where x=l·m-1, M represents the number of REGs contained in each CCE.

The column permutation pattern is at least one of:

<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>；

taking l=2 and m=4 as an example, when the column permutation pattern is <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 is sequentially written, after reading, when the REG index is greater than 7, the REG index is considered as NULL element < NULL > elements, i.e. after NULL element is removed, REG index is 1,5,3,7,0,4,2,6, i.e. when the first control channel element CCE #0 of this candidate set corresponding to l=2 contains REG #1,5,3,7, and when l=1 CCE #0 contains #1,3,0,2, the REG resources used by the high aggregation level do not completely contain the REG resources used by the low aggregation level, and thus the misunderstanding of different aggregation levels cannot be caused.

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 is written sequentially, after reading, when the REG index is greater than 7, the REG index is considered as NULL element < NULL > elements, i.e. after the NULL element is removed, REG index is 0,4,1,5,2,6,3,7, i.e. the first control channel element CCE #0 of this candidate set corresponding to l=2 contains REG #0,4,1,5, while CCE #0 of l=1 contains #0,1,2,3, and REG resources used by high aggregation levels do not completely contain REG resources used by low aggregation levels, thus not causing misunderstanding of different aggregation levels.

Through the technical scheme of the preferred embodiment 3, the resource unit group corresponding to the control channel unit used by the downlink control channel can be determined during single TTI scheduling or multi-TTI scheduling, so that the terminal and the base station can accurately know the specific control resource position, and the distributed scheme implemented by the present patent can enable the centralized transmission and the distributed transmission to have the maximum performance gain respectively.

Preferred embodiment 4

The base station activates the terminal a to perform SPS transmissions for 1 semi-persistent scheduling in the period. The TTI preferably contains a small number of OFDM symbols, e.g., no more than 7 OFDM symbols, but is not limited thereto. The embodiment is described with respect to a short structure in a Long-Term Evolution (LTE) system, that is, the short TTI (sTTI) may be understood, but is not limited thereto. DL short TTI frame structure as shown in fig. 5, 6 DL (downlink) short TTIs are contained in a 1ms subframe, pattern1 is used when the sPDSCH is configured to start from OFDM symbol #1 or # 3; when the sPDSCH is configured to start from OFDM symbol #2, pattern2 is used. Note that here the OFDM symbol numbers start from 0, i.e. there are 14 OFDM in a 1ms subframe, with sequential numbers #0 to #13.UL short TTI frame structure as shown in fig. 6, 6 UL (Up Link) short TTIs are contained in a 1ms subframe. Note that here the OFDM symbol numbers start from 0, i.e. there are 14 OFDM in a 1ms subframe, with sequential numbers #0 to #13.

DCI of scheduling sTTI SPS can be transmitted in any DL sTTI, and when the DCI is positioned in DL sTTI#0, the DCI is carried by a PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sppdcch channel. Alternatively, DCI scheduling sTTI SPS may be transmitted in a partial sTTI, e.g., only in DL stti#0, and, e.g., only in DL stti#0, 3.

When scheduling sTTI SPS transmissions, the minimum period is 1 sTTI. If the reference signal density reduction is not considered, each sTTI contains a reference signal, and if the reference signal density reduction is considered, at least 1 sTTI of every N sTTI contains a reference signal. The determination mode of the N value is predefined or the value of the higher-layer signaling configuration. Preferably n=2, 3,6.

In the SPS downlink transmission with an activation period of 1 sTTI, in every N DL sTTI transmissions, the location of the demodulation reference signal (Demodulation Reference Signal, abbreviated as DMRS, also referred to as the reference signal in the above embodiment) is determined in at least one of the following manners: although the present example is described with reference to downlink transmission, the method for determining the location of the DMRS is not limited to downlink, but may be uplink. In this example, a scenario in which the DMRS is fixed in time domain position in the TTI is preferable.

Mode one: predefining that in every N transmission time intervals, only the first transmission time interval has a reference signal, and the rest transmission time intervals have no reference signal; no additional indication is needed at this point. DMRS is contained in the first PDSCH activating SPS transmissions, and only the first of every N sTTI contains DMRS.

Mode two: whether the pilot density is reduced in every N transmission time intervals is indicated by 1bit signaling. The signaling may be higher layer signaling, or physical layer signaling. Wherein, 1bit indicates whether the DMRS exists or not when the single sTTI is scheduled for the physical layer signaling. Wherein, not reducing the pilot density means that all N transmission time intervals contain reference signals, and reducing the pilot density means that less than N transmission time intervals contain reference signals. Reducing the pilot density includes at least one of: only the first transmission time interval has a reference signal therein; only the first and last transmission time intervals have reference signals in them; only the first and x transmission time intervals offset relative to the first have reference signals in them, x being preferably 1, 2, N/2, N-1, N;

mode three: signaling a reference signal pattern in every N transmission time intervals; for example as shown in table 7. Note: r represents that RS is contained in the s, and D represents that RS is not contained in the sTTI. If n=2, the 1bit indication pattern is RR or RD. If n=3, the 2bits indication pattern is RRR, RDD, RDR or DRD. If n=6, 2bits are used to indicate RRRRRR, RDRDRD, RDDRDD or RDRRDR. Preferably n=3 is aligned with the slot boundary. Preferably n=6 is aligned with the subframe boundary.

Table 7 indicates pilot patterns in every N s

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

At this time, for the case where there is no data transmission in the first sTTI in a set of N sTTI, the solution of how to use the reference signal when there is data transmission in the subsequent sTTI includes at least one of the following: (1) The reference signal used is the last received DMRS; (2) transmitting DMRS when there is no data transmission; (3) And postponing the transmission to the next sTTI containing the DMRS, wherein only one sTTI is needed to be postponed when N=2, and the latter sTTI is the sTTI containing the DMRS.

In the case of SPS uplink transmission with an activation period of 1 sTTI, in every N UL sTTI transmissions, the location of the demodulation reference signal (Demodulation Reference Signal, abbreviated as DMRS, also referred to as the reference signal in the above embodiment) is determined in at least one of the following manners: although the present example is described with reference to uplink transmission, the method for determining the location of the DMRS is not limited to uplink, but may be downlink. In this example, a scenario in which the time domain position of the DMRS is not fixed in the TTI is preferable.

Mode one: it is predefined that in every N TTIs, the N TTIs all contain reference signals and preferably only the first OFDM symbol in each transmission time interval contains reference signals. This way the reference signal density is not reduced and the symbol position of the reference signal in each sTTI is predefined.

Mode two: predefining that in every N transmission time intervals, there is a reference signal in only the first transmission time interval and preferably that in the first transmission time interval only the first OFDM symbol contains a reference signal, and that there is no reference signal in the remaining transmission time intervals; no additional indication is needed at this point. The DMRS is contained in the first PUSCH of the active SPS transmission, and only the first sTTI of every N sTTI contains DMRS.

Mode three: whether the reference signal density is reduced in every N transmission time intervals is indicated by 1bit signaling. The signaling may be higher layer signaling, or physical layer signaling. Wherein 2bits indicate DMRS position when the physical layer signaling reuse single-sTTI scheduling. Wherein, the reference signal density is not reduced, which means that all N transmission time intervals contain reference signals and the preferred mode is that only the first OFDM symbol in each transmission time interval contains reference signals, and the reference signal density is reduced, which means that less than N transmission time intervals contain reference signals and the preferred mode is that only the first OFDM symbol in the transmission time interval containing reference signals contains reference signals. Reducing the reference signal density includes at least one of: only the first transmission time interval has a reference signal therein; only the first and last transmission time intervals have reference signals in them; only the first and x transmission time intervals offset relative to the first have reference signals in them, x being preferably 1, 2, N/2, N-1, N;

Mode four: signaling a reference signal pattern in every N transmission time intervals; such as shown in table 8. Note: r represents that the OFDM symbol contains the DMRS, and D represents that the OFDM symbol does not contain the DMRS. Note: when 3OS, DR corresponds to DDR and RD corresponds to RDD. If n=2, the 2bits indication pattern is rd|rd, rd|dd, dr|dd or dd|rd. If n=3, using 2bits indication the pattern is RD|RD|RD, RD|DD|DD, RD|DD|RD or DD|RD|DD. If n=6, uses 2bits to indicate RD|RD|RD|RD|RD, indicating RD using 2bits RD|RD|RD|RD|RD, RD|DD|DD| RD|DD|DD or RD|DD| DD or DD. Preferably n=3 is aligned with the slot boundary. Preferably n=6 is aligned with the subframe boundary.

Table 8 indicates the reference signal pattern in every N sTTIs

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

Note:|denotes the boundary of sTTI n

Preferably, the TTI in which the first traffic transmission of the SPS transmission is activated contains the reference signal.

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

By the technical scheme provided by the preferred embodiment, the DMRS overhead can be saved when sTTI SPS scheduling is realized, and the support of one or more sTTIs containing the DMRS is indicated by smaller indication overhead, so that the method is suitable for medium-low speed moving scenes and high-speed moving scenes. Meanwhile, after the expenditure of the reference signal is saved, more resources can be used for data transmission, and the system spectrum efficiency is improved.

Example 5

The base station configures the terminal a to perform semi-persistent scheduling SPS transmissions including 1 TTI in a period. The TTI preferably contains a small number of OFDM symbols, e.g., no more than 7 OFDM symbols, but is not limited thereto. In this embodiment, when a short TTI structure in a Long-Term Evolution (LTE) system is used for illustration, the TTI may be understood as a short TTI (sTTI) but is not limited thereto, and may be used in a new air interface system of 5G NR. In this embodiment, when LTE is taken as an example for illustration, 1slot contains 7 OFDM symbols, and the duration is 0.5ms; taking NR as an example, a 1slot contains 14 OFDM symbols and has a duration of 1ms at 15kHz subcarrier spacing. DL short TTI frame structure as shown in fig. 5, 6 DL (downlink) short TTIs are contained in a 1ms subframe, pattern1 is used when the sPDSCH is configured to start from OFDM symbol #1 or # 3; when the sPDSCH is configured to start from OFDM symbol #2, pattern2 is used. Note that here the OFDM symbol numbers start from 0, i.e. there are 14 OFDM in a 1ms subframe, with sequential numbers #0 to #13.UL short TTI frame structure as shown in fig. 6, 6 UL (Up Link) short TTIs are contained in a 1ms subframe. Note that here the OFDM symbol numbers start from 0, i.e. there are 14 OFDM in a 1ms subframe, with sequential numbers #0 to #13.

Scene 1: DCI of scheduling activation sTTI SPS can be transmitted in any DL sTTI, and when the DCI is positioned in DL sTTI#0, the DCI is carried by a PDCCH channel; when the DCI is located in DL sTTI #1 to #5, it is carried by the sppdcch channel. At this time, the sTTI length is configured to be 2/3os or 1-slot by RRC, and the sTTI SPS period is configured by RRC. Alternatively, the sTTI length and the sTTI SPS period are configured by RRC joint coding, i.e. when the SPS period is configured to be 1sTTI, the corresponding sTTI length is indicated at the same time, e.g. as shown in table 9, e.g. indicating that both states 0 and 1 indicate that the SPS period is 1sTTI, but the corresponding sTTI lengths are different. Such as the example in NR shown in table 10, jointly indicates the service duration (time domain length) and SPS period. Note that the joint coding indications in tables 9 and 10 are only examples, and the states therein are only examples, but not limited thereto. In this embodiment os is an abbreviation of OFDM Symbol, i.e. OFDM Symbol.

Table 9 joint coding indicates sTTI SPS period and sTTI length

Table 10 joint coding indicates SPS period and service duration

Indicating status	SPS period and service duration
		0	1 service duration and service duration of 2os
1	1 service duration and 7os
		2	2 service duration and service duration of 2os
3	3 service duration and service duration of 2os
		4	1slot and service duration of 2os
5	1slot and service duration of 7os
		6	2 slots and service duration of 2os
7	2 slots with service duration of 7os

Scene 2: the DCI scheduling the activation of sTTI SPS may be transmitted in a partial sTTI, e.g., only in DL stti#0. Or only the first mini-slot in the slots (containing 14 OFDM symbols) in the NR can transmit DCI scheduling sTTI SPS or only one control channel trigger opportunity.

For transmission only in stti#0, DCI is carried on PDCCH at this time. When both the sTTI SPS period and the offset are configured by RRC, then the sTTI length and the sTTI SPS period and the offset may be configured or jointly encoded, respectively.

When configured separately, the sTTI length is 2/3os or 1-slot, and the sTTI SPS period and offset are configured by RRC, for example as shown in table 11, it should be noted that when the period is greater than 1ms, no matter what the period is, the offset only needs to consider the offset within the 1ms subframe range, as shown in table 11 for the configuration at 2/3os, and table 12 for the configuration at 1-slot; table 13 shows the configuration for the case where the service duration in NR is 2os, and table 14 shows the configuration for the case of 7 os. In summary, when a certain sTTI length or service duration is determined, the number of values for each period offset value is as follows: when the SPS period is less than 1ms, the offset value takes the number of the SPS period containing 1sTTI or the number of 1 service duration; when the SPS period is greater than 1ms, the number of the offset values is 1ms, and the number of the 1sTTI or the 1 service duration is contained in the offset values;

Table 11 indicates sTTI SPS period and offset

Table 12 indicates sTTI SPS period and offset

Table 13 indicates SPS period and offset

Table 14 indicates SPS period and offset

When jointly configured, the sTTI length is 2/3os or 1-slot and the sTTI SPS period and offset are configured by RRC, e.g., as shown in table 15. As illustrated in the NR shown in table 16, the service durations are exemplified by 2os and 7 os. It should be noted that when the period is greater than 1ms, the offset only needs to consider the offset within the 1ms subframe, regardless of the period and the sTTI length. In summary, the number of values for each period offset value is as follows: when the SPS period is less than 1ms, the offset value takes the number of the SPS period containing 1sTTI or the number of 1 service duration; when the SPS period is greater than 1ms, the offset value takes the number that 1 subframe contains 1sTTI or the number of 1 service duration;

table 15 indicates sTTI SPS period and offset and sTTI length

Table 16 indicates SPS period and offset and duration of service

When the sTTI SPS period is configured by RRC, then the sTTI length and SPS offset are indicated by DCI joint coding. In the LTE sTTI, table 17 shows. In NR, as shown in Table 18. The values in the table are illustrative only and are not intended to be limiting.

Table 17 indicates sTTI length and SPS offset

Indication index	sTTI length and SPS offset
		0	2/3os and offset by 0sTTI
1	2/3os and offset 1sTTI
		2	2/3os and offset by 2sTTI
3	2/3os and offset 3sTTI
		4	2/3os and offset by 4sTTI
5	2/3os and offset by 5sTTI
		6	1slot and offset 0sTTI
7	1slot and offset 1sTTI

Table 18 indicates the duration of service and SPS offset

Indication index	sTTI length and SPS offset
		0	2os and offset 0os
1	2os and offset 2os
		2	2os and offset 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

Scene 3: the absence of an active DCI triggers an SPS transmission, i.e. the SPS transmission is fully configured by RRC, also referred to as a scheduling-free transmission, i.e. grant-free transmission. At this time, SPS period, offset, and service time domain length may be configured separately or jointly encoded.

When configured separately, the service duration is configured by RRC signaling, and the SPS period and offset are configured by RRC signaling. The duration may be at least one of 2os, 4os, 7 os. The principle is as follows: in a specific sTTI length or service duration, the number of SPS periods is 1sTTI or 1 service duration for each period offset value, where the SPS periods and offsets are configured as shown in table 19, taking 7os as an example. Or the principle is as follows: in a case of a certain sTTI length or service duration, the number of values of the offset value for each period is less than or equal to the number of SPS periods including 1sTTI or 1 service duration, and the SPS periods and offsets are configured as shown in table 20 by taking 7os as an example. Note that the values in the table are only illustrative, but not limited thereto.

Table 19 indicates SPS period and offset

Table 20 indicates SPS period and offset

Index I_sps	SPS period	Offset of
			0	1 service duration	I_sps
1-2	1ms	I_sps-1
			3-4	2ms	I_sps-3
5-6	3ms	I_sps-5
			...	...	...

When joint coding is configured, the service duration, SPS period, and offset are configured through RRC signaling. In this case, the service duration including 2os and 7os is taken as an example, but the method is not limited thereto. The principle is as follows: the number of SPS periods for each period offset value is the number of 1sTTI or 1 traffic duration, as shown in table 21. Or the principle is as follows: the number of values of the offset value for each period is less than or equal to the number of SPS periods comprising 1sTTI or 1 service duration, as shown in table 22. Note that the values in the table are only illustrative, but not limited thereto.

Table 21 indicates SPS period and offset and duration of service

Table 22 indicates SPS period and offset and duration of service

By the technical scheme provided by the preferred embodiment, when SPS transmission with short service duration in sTTI SPS or NR is realized, the SPS period, offset and service duration can be flexibly determined in various modes, and physical layer signaling overhead saving or high layer signaling overhead saving is realized.

Example 9

An embodiment of the present invention also provides a storage medium including a stored program, where the program executes the method of any one of the above.

Alternatively, in the present embodiment, the above-described storage medium may be configured to store program code for performing the steps of:

s1, indicating that a reference signal exists in at least one TTI in N scheduled transmission time intervals in a preset mode, wherein N is a positive integer.

Alternatively, in the present embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Embodiments of the present invention also provide a processor for running a program, wherein the program when run performs the steps of any of the methods described above.

Optionally, in this embodiment, the above program is configured to execute the following steps:

Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments and optional implementations, and this embodiment is not described herein.

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may alternatively be implemented in program code executable by computing devices, so that they may be stored in a memory device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining a control channel element, characterized in that it includes:

A control channel unit is formed by selecting a portion of the resource unit groups from 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 comprises:

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 for use in a short physical downlink control channel (sPDCCH), the sREG index constituting 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 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 comprises: 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.

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, wherein the column permutation pattern comprises at least one of the following:

<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 it comprises:

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:

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 comprises a stored program, wherein the program, when executed, performs the method of any one of claims 1-5.