CN111435870B

CN111435870B - Transmission method and device of downlink control channel and storage medium

Info

Publication number: CN111435870B
Application number: CN201910028689.1A
Authority: CN
Inventors: 石靖; 郝鹏; 左志松; 张晨晨; 韩祥辉
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2022-12-30
Anticipated expiration: 2039-01-11
Also published as: WO2020143286A1; CN111435870A

Abstract

The present disclosure provides a transmission method and apparatus for a downlink control channel, and a storage medium, wherein the method includes: the communication node repeatedly transmits the downlink control channel in the time slot, or repeatedly transmits the downlink control channel in the time slot and between the time slots.

Description

Transmission method and device of downlink control channel and storage medium

Technical Field

The present disclosure relates to the field of communications, and in particular, to a method and an apparatus for transmitting a downlink control channel, and a storage medium.

Background

Currently, the fourth Generation mobile communication technology (the 4th Generation mobile communication technology, abbreviated as 4G) Long-Term Evolution (Long-Term Evolution, abbreviated as LTE)/Long-Term Evolution advanced (Long-Term Evolution/LTE-a) and the fifth Generation mobile communication technology (the 5th Generation mobile communication technology, abbreviated as 5G) face more and more demands. From the current development trend, 4G and 5G systems are both researching and supporting the characteristics of mobile broadband enhancement, ultrahigh reliability, ultralow time delay transmission and massive connection. In order to support the features of ultra-high reliability and ultra-low latency transmission, reliability needs to be improved in a repetitive transmission manner with a short transmission time interval, which may be a single or several Orthogonal Frequency Division Multiplexing (OFDM) symbols. For a Physical Downlink Control channel (PDCCH for short), in the prior art, to implement PDCCH Repetition transmission (PDCCH Repetition), downlink Control Information (DCI for short) with the same content is sent at the same location of different slots to implement PDCCH Repetition, and a characteristic of low-delay transmission is not considered.

In the related art, no effective technical scheme has been proposed yet for the problem of how to implement repeated transmission of the PDCCH in the slot.

Disclosure of Invention

The embodiment of the disclosure provides a transmission method and device of a downlink control channel, and a storage medium, so as to at least solve the problem of how to realize repeated transmission of a PDCCH in a slot in the related art.

According to an embodiment of the present disclosure, a method for transmitting a downlink control channel is provided, including: the communication node repeatedly transmits the downlink control channel in the time slot, or repeatedly transmits the downlink control channel in the time slot and between the time slots.

According to another embodiment of the present disclosure, there is also provided a transmission apparatus of a downlink control channel, applied to a communication node, including: and the transmission module is used for repeatedly transmitting the downlink control channel in the time slot, or repeatedly transmitting the downlink control channel in the time slot and between the time slots.

According to another embodiment of the present disclosure, there is also provided a method for configuring a candidate set, including: the configuration mode of the candidate set candidates in the search space where the downlink control channel is located includes: different numbers of candidates are configured for different occaseons.

According to another embodiment of the present disclosure, there is also provided a storage medium having a computer program stored therein, wherein the computer program is configured to execute the transmission method of any one of the above downlink control channels when running.

By the method and the device, the communication node repeatedly transmits the downlink control channel in the time slot, or repeatedly transmits the downlink control channel in the time slot and between the time slots, and further solves the problem that how to realize the repeated transmission of the PDCCH in the time slot in the related technology is not realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 is a flow chart of transmission of a downlink control channel according to an embodiment of the present disclosure;

fig. 2 is a block diagram of a transmission apparatus of a downlink control channel according to an embodiment of the present disclosure;

fig. 3 is another flow chart of transmission of a downlink control channel according to an embodiment of the disclosure;

fig. 4 is another block diagram of a transmission apparatus of a downlink control channel according to an embodiment of the present disclosure;

fig. 5 is a diagram (one) of the transmission of a downlink control channel according to the preferred embodiment of the present disclosure;

fig. 6 is a schematic diagram (two) of the transmission of the downlink control channel according to the preferred embodiment of the present disclosure;

fig. 7 is a schematic diagram (three) of transmission of a downlink control channel according to a preferred embodiment of the present disclosure;

fig. 8 is a schematic diagram (four) of transmission of a downlink control channel according to a preferred embodiment of the present disclosure;

fig. 9 is a schematic diagram (v) of transmission of a downlink control channel according to a preferred embodiment of the present disclosure;

fig. 10 is a schematic diagram (vi) of transmission of a downlink control channel according to a preferred embodiment of the present disclosure;

fig. 11 is a diagram (seven) of transmission of a downlink control channel according to a preferred embodiment of the present disclosure.

Detailed Description

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

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

Therefore, how to implement PDCCH Repetition in one slot needs to be solved to satisfy the low-latency high-reliability characteristic, and at the same time, the blocking rate of the control channel can be reduced.

Currently, PDCCH Repetition supported by R15NR is implemented by configuring search space duration (search space duration). The method mainly aims to solve the problem that a control channel for scheduling paging messages can schedule different terminal Users (UE) by using different beam directions, and Downlink Control Information (DCI) with the same content is transmitted at the same occasion positions of different slots to realize PDCCH Repetition. At present, R16 needs to support low-latency high-reliability (URLLC) service transmission, and also can use PDCCH Repetition to improve reliability and reduce blocking rate, and a low-latency characteristic needs to be ensured when using PDCCH Repetition, while PDCCH Repetition of R15 does not consider the characteristic of low-latency transmission, so how to implement PDCCH Repetition in one slot needs to be solved. Currently, R15 does not support PDCCH Repetition in one slot.

The communication system needs to solve how to implement repeated transmission of a downlink control channel in one slot, and the embodiments of the present disclosure and preferred embodiments provide the following technical solutions.

Example 1

An embodiment of the present disclosure provides a method for transmitting a downlink control channel, and fig. 1 is a flowchart of transmission of the downlink control channel according to the embodiment of the present disclosure, and as shown in fig. 1, the method includes:

step S102, the communication node repeatedly transmits the downlink control channel in the time slot, or repeatedly transmits the downlink control channel in the time slot and between the time slots.

Through the steps, the communication node repeatedly transmits the downlink control channel in the time slot, or repeatedly transmits the downlink control channel in the time slot and between the time slots, so that the problems that how to realize repeated transmission of the PDCCH in the time slot and the like in the related technology are not realized, and further the repeated transmission of the downlink control channel in the time slot or the repeated transmission of the downlink control channel in the time slot and between the time slots is realized.

It should be noted that the transmission in the embodiment of the present disclosure may be understood as a sending operation and may also be understood as a receiving operation, that is, step S102 may also be understood as:

1) The communication node repeatedly sends the downlink control channel in the time slot, or repeatedly sends the downlink control channel in the time slot and between the time slots; and/or

2) The communication node repeatedly receives the downlink control channel within the time slot, or repeatedly receives the downlink control channel within the time slot and between the time slots.

In an embodiment of the present disclosure, the downlink control channel is repeatedly transmitted in consecutive downlink symbols in a time slot, the repetition number of the repeated transmission of the downlink control channel is R, when a search space period is configured to be 1 time slot, the repetition number R is determined by a configured search space duration, where R is a positive integer, the repetition number R is determined by high-level parameter configuration, repeated transmission in and among the time slots is determined by configuring the repetition number R and the search space duration, the repetition number R is determined only by repeating in the time slot, and the repeated transmission is within a time slot range.

In the embodiment of the present disclosure, the repeated transmission uses each occasion ocassion as a starting point, uses the duration of the CORESET as a granularity, and repeats R times, or uses each occasion as a starting point, uses 1 symbol as a granularity, and repeats R times within the CORESET duration, where the symbol in the embodiment of the present disclosure is preferably an Orthogonal Frequency Division Multiplexing (ODFM) symbol, and the occasion means: the method comprises the steps that transmission is repeated in a configured occase opportunity at the time corresponding to a first symbol configured by a 14-bit bitmap in a time slot of a search space period position, when the search space period is configured to be 1 time slot, the repetition frequency R is determined by configured search space duration, the repetition frequency R is determined by high-level parameter configuration or N/X, wherein N represents the total number of occases configured in the time slot, X represents the configured search space duration, repeated transmission in the time slot and among the time slots is determined by configuring the repetition frequency R and the search space duration, the repetition frequency R is only determined to be repeated in the time slot, and the repeated transmission is in a time slot range.

In an embodiment of the present disclosure, the repeated transmission uses an occase meeting the requirement as a starting point, and uses a CORESET duration as a granularity to repeat R times, or uses each occase as a starting point, and uses 1 symbol as a granularity to repeat R times, where the occase meeting the requirement at least includes one of the following: all configured occasion; the first of every R in the configured occase from the first; the first of the occase configured; the occase is configured to start from the first one in every N/X.

It should be noted that, the TCI state determination manner for each transmission in the slot or inter-slot repeated transmission of the downlink control channel includes one of the following: the same TCI state parameter is used, the TCI state parameters are used sequentially, and the TCI state parameters are used according to RRC-configured pattern.

Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method according to the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium (such as a ROM/RAM, a magnetic disk, and an optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, or a network device) to execute the methods of the embodiments of the present disclosure.

Example 2

In this embodiment, a transmission apparatus for a downlink control channel is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and details of which have been already described are omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware or a combination of software and hardware is also possible and contemplated.

Fig. 2 is a block diagram of a structure of a transmission apparatus of a downlink control channel according to an embodiment of the present disclosure, and as shown in fig. 2, the apparatus includes:

the first transmission module 20 is configured to repeatedly transmit the downlink control channel in the time slot, or repeatedly transmit the downlink control channel in and between the time slots.

According to the method and the device, the communication node repeatedly transmits the downlink control channel in the time slot, or repeatedly transmits the downlink control channel in the time slot and between the time slots, so that the problems that how to realize repeated transmission of the PDCCH in the time slot and the like in the related technology are solved, and further the repeated transmission of the downlink control channel in the time slot or the repeated transmission of the downlink control channel in the time slot and between the time slots is realized.

It should be noted that, the transmission in the embodiment of the present disclosure may be understood as a sending operation, and may also be understood as a receiving operation, that is, the first transmission module 20 is further configured to:

1) Repeatedly sending the downlink control channel in the time slot, or repeatedly sending the downlink control channel in the time slot and between the time slots; and/or

2) And repeatedly receiving the downlink control channel in the time slot, or repeatedly receiving the downlink control channel in the time slot and between the time slots.

In this disclosure, the repeated transmission uses each opportunity occasting as a starting point, and uses the duration of the control resource set CORESET as a granularity to repeat R times, or uses each occasting as a starting point, and uses 1 symbol as a granularity to repeat R times within the CORESET duration, where occasting means: the method comprises the steps that transmission is repeated in a configured occase opportunity at the time corresponding to a first symbol configured by a 14-bit bitmap in a time slot of a search space period position, when the search space period is configured to be 1 time slot, the repetition frequency R is determined by configured search space duration, the repetition frequency R is determined by high-level parameter configuration or N/X, wherein N represents the total number of occases configured in the time slot, X represents the configured search space duration, repeated transmission in the time slot and among the time slots is determined by configuring the repetition frequency R and the search space duration, the repetition frequency R is only determined to be repeated in the time slot, and the repeated transmission is in a time slot range.

In an embodiment of the present disclosure, the repeated transmission uses an occase meeting the requirement as a starting point, and uses a CORESET duration as a granularity to repeat R times, or uses each occase as a starting point, and uses 1 symbol as a granularity to repeat R times, where the occase meeting the requirement at least includes one of the following: all configured occasions; the first of every R in the configured occasion from the first; the first one in the occase; the first of every N/X in the configured occasion.

It should be noted that, the TCI state determination manner for each transmission in the slot or inter-slot repeated transmission of the downlink control channel includes one of the following: the same TCI state parameter is used, the TCI state parameters are used sequentially, and the TCI state parameters are used according to RRC configured pattern.

Example 3

In an embodiment of the present disclosure, a method for configuring a candidate set is further provided, and fig. 3 is another flowchart of the method for configuring a candidate set according to the embodiment of the present disclosure, as shown in fig. 3, including:

in step S302, the configuration of the candidate set candidates of the search space where the downlink control channel is located includes: different numbers of candidates are configured for different occaseons.

Specifically, the configuration mode includes one of the following: configuring the number of candidate sets of each aggregation level in the first occase, wherein the number of the candidate sets of the rest occases is a multiple of the number of the candidate sets in the first occase; the number of candidate sets of each aggregation level is configured as a reference value, and the ratio of the number of candidate sets of each occase to the reference value is configured.

Example 4

In this embodiment, a device for configuring a candidate set is further provided, where the device is used to implement the foregoing embodiments and preferred embodiments, and details of which have been already described are omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware or a combination of software and hardware is also possible and contemplated.

Fig. 4 is a block diagram of a configuration apparatus of a candidate set according to an embodiment of the present disclosure, and as shown in fig. 4, the apparatus includes:

the second transmission module 40 is configured to implement a configuration manner of candidate sets candidates of a search space where a downlink control channel is located by: different numbers of candidates are configured for different occasting.

It should be noted that the technical solutions of the foregoing embodiments 1 to 4 may be used in combination, or may be used alone, and the embodiments of the present disclosure do not limit this.

The technical solutions described above are described below with reference to preferred embodiments, but are not intended to limit the technical solutions of the embodiments of the present disclosure.

Preferred embodiment 1

When the search space period is equal to 1slot, the Repetition number of the PDCCH Repetition in the slot is determined by the search space duration parameter. The method comprises the following specific steps:

configuring high-level signaling parameters required by downlink control channel transmission. The frequency domain resource and the time domain symbol number of a control resource set (CORESET) are configured by high-level parameters. The period and duration of the search space is configured by higher layer parameters. The configured search space period is N slots, N is a positive integer, the configured search space duration (or SS duration) is X, X is less than or equal to N, when X is equal to 1, it indicates that PDCCH is transmitted once, and when X is greater than 1, it indicates that PDCCH can execute PDCCH Repetition at the same occasion position of different slots. Wherein, the occast position in the slot is configured in a bitmap mode of 14 bits through a high-level parameter. In order to further support PDCCH Repetition in a slot, and at the same time, on the premise of not affecting the operation of the existing mechanism, when a search space period N =1slot, a search space duration parameter needs to be reinterpreted, that is, at this time, a configuration of X >1 may also be supported on the premise of N =1, and at this time, continuous symbols starting from each occasion in a slot are repeatedly transmitted and are determined by the search space duration, that is, the number of times of repeated transmission R = X. In the first mode, the CORESET duration is taken as the granularity, and the method is repeated for R times, so that the beneficial effect is that the method can coexist with the search space of legacy UE; in the second way, the repetition is performed R times in the CORESET with the granularity of a single symbol, and the advantage of this case is that the repeated transmission does not add extra delay compared with the single transmission in the prior art.

For the first mode, the starting point of PDCCH Repetition at this time is still determined by the configuration of the high layer parameter first symbols of 14bit bitmap. For example, as shown in fig. 3, the search space period is configured to be 1slot, the CORESET duration is configured to be 1 symbol, and the first symbols are configured to be 10010001010000, i.e. the occase location is four locations with symbol index of 0,3,7, 9. At this time, by allocating the search space duration =2, the repetition of consecutive symbols with the granularity of CORESET duration from each multicast within the slot is realized, and the number of repetitions R = X =2. In this case, the starting point of PDCCH Repetition is also the configured first symbols, and the repeated transmission is performed in consecutive symbols. Namely, the implementation condition of the scheme is that SS period =1slot, and the meaning of the search space duration when SS period =1slot is reinterpreted is the number of times of repeated transmission in the slot.

For the second mode, the starting point of PDCCH Repetition at this time is still determined by the configuration of the high layer parameter first symbols of 14bit bitmap. In this case, the search space period is configured to be 1slot, the CORESET duration is configured to be 2 symbols, and the first symbols are configured to be 10010001010000, i.e., the occase location is four locations with symbol index of 0,3,7, 9. At this time, by configuring the search space duration =2, continuous symbols with a single symbol as granularity in CORESET from each epoch within a slot are repeatedly transmitted, and the number of times of repeated transmission R = X =2. At this time, the starting point of PDCCH Repetition is also the configured first symbols, and the repeated transmission is performed in consecutive symbols. Namely, the implementation condition of the scheme is that SS period =1slot, and the meaning of the search space duration when SS period =1slot is reinterpreted as the number of times of repeated transmission in the slot, and the value of the search space duration parameter does not exceed the value configured by the CORESET duration.

Has the beneficial effects that: by the transmission method of the downlink control channel according to the embodiment of the present disclosure, by reinterpreting the meaning of the search space duration parameter when the search space period is 1slot, the search space duration can also be configured to be a value greater than 1 when the search space period is configured to be 1slot, and thus the PDCCH Repetition in the slot is implemented. At the moment, the number of CCEs used for channel estimation cannot be increased, and the low-delay characteristic is ensured while the high-reliability blocking rate is reduced.

Preferred embodiment 2

The Repetition times R are configured through high-level signaling to realize the Repetition in the slot, the Repetition times of the PDCCH Repetition in the slot are determined through a high-level parameter R, and the Repetition transmission between the slots can be simultaneously realized by combining with the search space duration. The method specifically comprises the following steps:

and configuring high-level signaling parameters required by downlink control channel transmission. The frequency domain resource and the time domain symbol number of a control resource set (CORESET) are configured by high-level parameters. The period and duration of the search space is configured by higher layer parameters. The period of the configured search space is N slots, N is a positive integer, the search space duration is X, and X is less than or equal to N. The configuration repetition number R represents PDCCH repeated transmission in the slot. At this time, when R =1, x =1, this time indicates that the PDCCH performs a single transmission at each occase; when R >1, X =1, the PDCCH is repeatedly transmitted in the slot at the time, and the repeated transmission is not executed in the slot; when R =1, X > < 1 >, the PDCCH is indicated to perform repeated transmission at the same occasting position in the slot at the moment, and the repeated transmission is not performed in the slot; when R >1, X > < 1, this indicates that the PDCCH performs repeated transmission at the same occasting position among slots, and simultaneously performs repeated transmission in the slots. Wherein, the occasting position in the slot is configured in a bitmap mode of 14 bits through high-level parameters. The number of repetitions R of the RRC configuration at this time indicates the repetition of consecutive symbols from the occase location. In the first mode, the CORESET duration is taken as the granularity, and the method is repeated for R times, so that the beneficial effect is that the method can coexist with the search space of legacy UE; mode two, repeat R times at single symbol granularity, preferably within CORESET, which has the advantage that repeated transmission does not add additional delay to the single transmission of the prior art. That is, the difference from embodiment 1 at this time is that when the search space period is greater than 1slot, the intra-slot repetition transmission can still be supported, and the intra-slot and/or inter-slot repetition can be flexibly implemented by using the R and SS duration parameters configured by the higher layer signaling.

For the first mode, the starting point of PDCCH Repetition in the slot at this time is still determined by the configuration of the high-layer parameter first symbols of the 14-bit bitmap. For example, when the search space period is configured to be 2 slots, the CORESET duration is configured to be 2 symbols, and the first symbols are configured to be 10000001000000, i.e., the occase location is two locations with symbol index of 0,7. At this time, by configuring the search space duration as X and the repetition number as R, the repeated transmission within or between slots is realized. When X =1, r =1, only a single transmission is performed at this time; when X =1,r =2, consecutive symbols starting from each occase and having a CORESET duration as a granularity are repeatedly transmitted, that is, the repeated transmission may be performed 2 times of PDCCH Repetition at symbols 0-3, or 2 times of PDCCH Repetition at symbols 7-10; when X =2,r =1, PDCCH Repetition is performed at the same occase location of two slots at this time; when X =2, r =2, PDCCH Repetition is performed simultaneously within and between slots at this time. At this time, the starting point of PDCCH Repetition is also the configured first symbols, and the repeated transmission is performed in consecutive symbols. For another example, as shown in fig. 6, when the search space period is configured to 2 slots, the CORESET duration is configured to 1 symbol, and the first symbols are configured to 10010001010000, that is, the occast position is the symbol index of 0,3,7,9, and when the search space duration is configured to X and the Repetition number is R, the repeat transmission within a slot or between slots is implemented, when X =2, R =2, and the PDCCH Repetition is performed within a slot and between slots at the same time, and the starting point of the PDCCH Repetition is also the configured first symbols, and the repeat transmission is implemented in consecutive symbols, for example, by using symbol 0, whose slot is repeated on symbol 1, slot is repeated on symbol 0 of the next slot, and slot is also repeated within a slot is also performed on symbol 1.

For the second mode, the starting point of PDCCH Repetition at this time is still determined by the configuration of the high layer parameter first symbols of 14bit bitmap. For example, when the search space period is configured to be 2 slots, the CORESET duration is configured to be 2 symbols, and the first symbols are configured to be 10000001000000, i.e., the occase location is two locations with symbol index of 0,7. At this time, by configuring the search space duration as X and the repetition number as R, the repeated transmission within or between slots is realized. When X =1, r =1, only a single transmission is performed at this time; when X =1,r =2, consecutive symbol Repetition transmission starting from each occase at granularity of a single symbol at this time, i.e., repetition transmission may be performed 2 PDCCH Repetition times at

symbols

0 and 1, or 2 PDCCH Repetition times at

symbols

7 and 8, i.e., PDCCH Repetition times within CORESET of 2 OS; when X =2,r =1, PDCCH Repetition is performed at the same occase location of two slots at this time; when X =2, r =2, PDCCH Repetition is performed simultaneously within and between slots at this time. Namely, the method requires that the value of the configured R parameter does not exceed the value configured by the CORESET duration.

Has the advantages that: by the transmission method of the downlink control channel according to this embodiment, PDCCH Repetition within a slot or between slots can be flexibly implemented by configuring the number of times of PDCCH repeated transmission within the slot and combining with the search space duration parameter. At the moment, the number of CCEs used for channel estimation cannot be increased, and the low-delay characteristic is ensured while the high-reliability blocking rate is reduced.

Preferred embodiment 3

When the search space period is equal to 1slot, the number of times that the PDCCH Repetition is repeated in the slot is determined by the search space duration parameter, and the transmission is repeated in the configured occasion. The method comprises the following specific steps:

configuring high-level signaling parameters required by downlink control channel transmission. The frequency domain resource and the time domain symbol number of a control resource set (CORESET) are configured by high-level parameters. The period and duration of the search space is configured by higher layer parameters. The configured search space period is N slots, N is a positive integer, the configured search space duration is X, X is less than or equal to N, when X is equal to 1, single transmission of the PDCCH is indicated, and when X is greater than 1, PDCCH Repetition is indicated to be executed at the same occasting position of different slots. Wherein, the occast position in the slot is configured in a bitmap mode of 14 bits through a high-level parameter. In order to further support intra-slot PDCCH Repetition, and at the same time, on the premise that the operation of the existing mechanism is not affected, when a search space period N =1slot, a search space duration parameter needs to be reinterpreted, that is, on the premise that N =1, configuration of X >1 may also be supported, at this time, PDCCH repeat transmission is performed in configured occases starting from an occase satisfying a condition in the slot, where the number of repeat transmission times is determined by a value X configured by the search space duration, that is, the number of repeat transmission times R = X, where the occase satisfying the condition is all configured occases, or every X occases are taken as the occases satisfying the condition. In the first mode, the CORESET duration is used as granularity to repeat R times in the configured occasions, and the beneficial effect at this time is that the CORESET duration can coexist with the search space of legacy UE; in the second mode, when the single symbol is used as the granularity and is repeated for R times, R may be greater than the value of the CORESET duration, and the beneficial effect at this time is that the repeated transmission has lower time delay.

For the first mode, the starting point of PDCCH Repetition at this time still determines the part occase through the configuration of the high layer parameter first symbols of 14bit bitmap. For example, as shown in fig. 7, the search space period is configured to be 1slot, the CORESET duration is configured to be 1 symbol, and the first symbols are configured to be 10010001010000, i.e., the occase location is four locations with symbol indexes of 0,3,7, and 9. At this time, by configuring the search space duration =2, the iterative transfer at the configured occase position with the granularity of CORESET duration from each occase within the slot is realized, and the number of iterative transfer R = X =2. At this time, the starting point of PDCCH Repetition is determined to be 1 repeated PDCCH repeated transmission starting point every X occases in the configured first symbols, and the repeated transmission is implemented in 2 occases. Namely, the implementation of the present solution is that the SS period =1slot, and the meaning of the search space duration when the SS period =1slot is reinterpreted is the number of times of repeated transmission in the slot, and the transmission is repeated in the configured occasion.

For the second mode, the starting point of PDCCH Repetition is still part occase determined by the high layer parameter first symbols configuration of 14bit bitmap. In this case, the search space period is configured to be 1slot, the CORESET duration is configured to be 2 symbols, and the first symbols are configured to be 10010001010000, i.e., the occase location is four locations with symbol index of 0,3,7, 9. At this time, by configuring the search space duration =4, the continuous symbol repetition transmission with the granularity of a single symbol in the CORESET from each occasion meeting the requirement in the slot is realized, and the repetition transmission frequency R = X =4. In this case, the starting point of PDCCH Repetition is also

symbol

0,7, and the repeated transmission is performed in the configured occase, that is, the repeated transmission may be performed in

symbol

0,1,3,4, or may be performed in

symbol

7,8,9, 10. That is, the implementation condition of the present solution is that SS period =1slot, and when SS period =1slot is reinterpreted, the meaning of the search space duration is the number of times of repeated transmission in the slot, and the value of the search space duration parameter may exceed the value configured by the CORESET duration.

Optionally, the repeat transmission starting point may also be determined according to the configured first symbols, that is, all occases may be used as the starting point of repeat transmission at this time, that is, at this time, each possible PDCCH Repetition candidate position is allowed to overlap, but once a certain PDCCH Repetition candidate position is actually occupied during actual transmission, other PDCCH Repetition candidate positions overlapping with the certain PDCCH Repetition candidate position cannot be used.

The method for transmitting the downlink control channel according to the embodiment has the beneficial effects that the meaning of the search space duration parameter is reinterpreted when the search space period is 1slot, so that the search space duration can be configured to be a value larger than 1 when the search space period is configured to be 1slot, and the PDCCH Repetition in the slot is further realized. At the moment, the number of CCEs used for channel estimation cannot be increased, and the low-delay characteristic is ensured while the high-reliability blocking rate is reduced.

Preferred embodiment 4

And configuring the repetition times R through high-layer signaling to realize the repeat in the slot, and repeatedly transmitting in the configured occase. The Repetition times of the PDCCH Repetition in the slot is determined by a high-layer parameter R, and the slot repeated transmission can be simultaneously realized by combining the search space duration. The method specifically comprises the following steps:

configuring high-level signaling parameters required by downlink control channel transmission. The frequency domain resource and the time domain symbol number of a control resource set (CORESET) are configured by high-level parameters. The period and duration of the search space is configured by higher layer parameters. The period of the configured search space is N slots, N is a positive integer, the duration of the configured search space is X, and X is less than or equal to N. The configured repetition number R indicates that PDCCH is repeatedly transmitted in a slot, and is repeatedly transmitted in the configured occase. At this time, when R =1, x =1, this indicates that the PDCCH performs a single transmission at each occast; when R >1, X =1, this indicates that the PDCCH is repeatedly transmitted in the slot, and the transmission is repeated in the configured occase, and the repeated transmission is not executed in the slot; when R =1, X > < 1 >, the PDCCH is indicated to perform repeated transmission at the same occasting position in the slot at the moment, and the repeated transmission is not performed in the slot; when R >1, X > < 1, this time, it means that the PDCCH performs repeated transmission at the same occasting position in slot, and simultaneously repeats transmission in slot, and repeats transmission in configured occasting. Wherein, the occasting position in the slot is configured in a bitmap mode of 14 bits through high-level parameters. The repetition number R of the RRC configuration at this time indicates that PDCCH retransmission is performed in the configured occase from the occase satisfying the condition. In the first mode, the CORESET duration is taken as granularity to repeat R times in configured occasions, and the beneficial effect at this time is that the CORESET duration can coexist with the search space of legacy UE; in the second mode, a single symbol is used as granularity to repeat R times, where R may be greater than the value of the CORESET duration, and this has the advantage that the repeated transmission does not add extra delay compared with the single transmission in the prior art. That is, the difference from embodiment 3 at this time is that when the search space period is greater than 1slot, the intra-slot repetition transmission can still be supported, and the intra-slot and/or inter-slot repetition can be flexibly implemented by using the R and SS duration parameters configured by the higher layer signaling.

For the first mode, the starting point of PDCCH Repetition in the slot at this time is still determined by the configuration of the high-layer parameter first symbols of the 14-bit bitmap. For example, in this case, the search space period is configured to be 2 slots, the CORESET duration is configured to be 1 symbol, and the first symbols are configured to be 10010001010000, i.e., the occase location is four locations with symbol index of 0,3,7, 9. At this time, by configuring the search space duration as X and the repetition number as R, the repeated transmission within or between slots is realized. When X =1, r =1, only a single transmission is performed at this time; when X =1,r =2, the starting point of PDCCH Repetition is part of symbols in the configured first symbols, such as

symbols

0 and 7, and the repeated transmission is performed in 2 occases, that is, the repeated transmission may be performed 2 times of PDCCH Repetition on

symbol

0,3, or 2 times of PDCCH Repetition on

symbol

7,9; when X =2,r =1, PDCCH Repetition is performed at the same occase location of two slots at this time; when X =2,r =2, PDCCH Repetition is performed simultaneously within and between slots, as shown in fig. 8, and the starting point of the repeated transmission is every 2 ocseeds, i.e. corresponding to

symbols

0,7 in the figure. Taking symbol 0 as an example, its intra-slot repetition is transmitted on symbol 3, the inter-slot repetition is performed on symbol 0 of the next slot, and the intra-slot repetition is also performed on symbol 3 in the next slot. At this time, the starting point of PDCCH Repetition is determined as 1 repeated PDCCH repeated transmission starting point for each R occases in the configured first symbols, and the repeated transmission is performed in R occases.

In the second embodiment, the starting point of PDCCH Repetition is also the portion occast determined by the configuration of the high layer parameter first symbols of the 14bit bitmap. For example, in this case, the search space period is configured to be 2 slots, the CORESET duration is configured to be 2 symbols, the first symbols are configured to be 10010001010000, that is, the occast position is four positions with symbol index of 0,3,7, 9. At this time, by configuring the search space duration as X and the repetition number as R, the repeated transmission within or between slots is realized. When X =1, r =1, only a single transmission is performed at this time; when X =1,r =4, the transmission is repeated 4 times in the configured occase with granularity of a single symbol starting from the portion occase satisfying the requirement, where R may be greater than the value of CORESET duration, that is, the repeated transmission may perform PDCCH Repetition 4 times on

symbols

0,1,3,4, or may perform PDCCH Repetition 4 times on

symbols

7,8,9, 10; when X =2,r =1, PDCCH Repetition is performed at the same occase location of two slots at this time; when X =2,r =4, PDCCH Repetition is performed simultaneously within and between slots at this time. That is, the value of the configured R parameter in this embodiment may exceed the value configured by the CORESET duration.

Optionally, the number of times R of repetition of the configuration described in this embodiment is limited to not exceed a single slot boundary.

Preferred embodiment 5

The Repetition times of the PDCCH Repetition is determined by the configured first symbols and the search space duration parameter. The method specifically comprises the following steps:

and configuring high-level signaling parameters required by downlink control channel transmission. The frequency domain resource and the time domain symbol number of a control resource set (CORESET) are configured by high-level parameters. The period and duration of the search space is configured by higher layer parameters. The period of the configured search space is N slots, N is a positive integer, the search space duration (also referred to as SS duration for short) is configured to be X, and X is used for determining the repetition number R. Wherein, the occasting position in the slot is configured in a bitmap mode of 14 bits through a high-level parameter, which is also called first symbols. To support PDCCH Repetition, the number of repetitions = X × Y, in a first manner. PDCCH Repetition is performed once in a period, X = search space duration (slot level), Y = occasion per slot (i.e. the number of 1s set in the 14-bit bitmap), and transmission is repeated on all occasions in the period. For example, the period is 2slot, y =2, and when X is configured to be 1, the process is repeated 2 times; when X is configured as 2, repeat 4 times. For example, the period is 2slot, y =4, and when X is configured to be 1, it is repeated 4 times, as shown in fig. 9; when X is configured to be 2, it is repeated 8 times as shown in fig. 10.

Pattern two, the number of repetitions = Y/X. The PDCCH Repetition is performed multiple times in a period, X = search space duration (slot level), and Y = occase per slot, that is, a method for implementing PDCCH Repetition in occase. For example, the period is 2slot, y =4, and when X is configured to be 1, it is repeated 4 times, as shown in fig. 9; when X is configured as 2, repeat 2 times as shown in fig. 11.

Optionally, the repeated transmission in this embodiment may be repeated R times with the CORESET duration as a granularity, and the beneficial effect at this time is that the repeated transmission may coexist with a search space of legacy UE; it may also be repeated R times within the CORESET at a single symbol granularity, which has the advantage that the repeated transmission does not add extra delay to the single transmission of the prior art.

Has the beneficial effects that: with the transmission method of the downlink control channel according to this embodiment, the number of repetitions of repeated transmission is determined according to the number of occase within a slot and the duration of a search space, and PDCCH Repetition can be implemented relatively easily or Repetition can be implemented by grouping occase within a slot. At the moment, the number of CCEs used for channel estimation is not increased, and the low-delay characteristic is ensured while the high-reliability blocking rate is reduced.

Preferred embodiment 6

Based on the above embodiments, the TCI state of each transmission in PDCCH Repetition is determined in one of the following manners:

in a first approach, the same TCI state parameters are used. Each of the repeated transmissions at this time is configured with the same TCI state parameter as the first transmission. I.e. the same as one TCI state of several TCI states in the CORESET configuration parameters activated by the MAC CE.

Mode two, the TCI state parameter is used sequentially. At this time, N TCI states are used in each transmission sequence in PDCCH Repetition in several TCI states in the CORESET configuration parameter activated by the MAC CE.

And the mode three, the pattern configured according to the RRC uses the TCI state parameter. At this time, N TCI states in several TCI states in the CORESET configuration parameter activated by the MAC CE use the TCI states for each transmission in the PDCCH Repetition according to the RRC configured TCI state pattern.

Preferred embodiment 7

For a single transmission of the PDCCH or a repeated transmission of the PDCCH, candidate sets candidates in the search space in which the PDCCH is located are configured to have different numbers of candidates for different occasions, and preferably, the number of candidates in the second half slot of the slots is greater than the number of candidates in the first half slot. That is, several first symbols indicated by the bitmap of 14 bits configure different numbers of candidates. For example, taking 1 first symbol per half slot as an example, in method 1, candidates configuring the search space are values for the 1 st first symbol, and candidates corresponding to the 2 nd first symbol are M times of the 1 st first symbol. In method 2, candidates are configured for the 2 nd first symbol, and the candidate corresponding to the 1 st first symbol is 1/M times of the 2 nd first symbol. In method 3, candidates are configured as a reference value, and each first symbol can be adjusted by a coefficient M (i), where i corresponds to each first symbol, for example, 2 first symbols are configured, and i =0,1. Preferably, M or M (i) is a predetermined value or a configured value, for example, a positive integer such as 1,2,3, etc., or a percentage such as 33%,50%,66%,150%, etc.

Has the advantages that: for the URLLC service, when the blind detection number capability or the control resource unit number capability is improved and each half slot is defined, it is considered that the first half slot has more requirements for the control channel and the second half slot has less requirements for the control channel, so that the candidate sets in different occasions are configured into different values to balance the processing capability of the control channel and avoid exceeding the upper limit of the blind detection capability or the upper limit of the control resource unit capability.

Example 5

Embodiments of the present disclosure also provide a storage medium including a stored program, where the program executes any one of the methods described above.

Alternatively, in this embodiment, the storage medium may be configured to store program codes for performing the following steps:

s1, a communication node repeatedly transmits a downlink control channel in a time slot, or repeatedly transmits the downlink control channel in the time slot and between the time slots.

Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

Optionally, for a specific example in this embodiment, reference may be made to the examples described in the above embodiment and optional implementation, and this embodiment is not described herein again.

It will be apparent to those skilled in the art that the modules or steps of the present disclosure described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present disclosure is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A method for transmitting a downlink control channel is characterized by comprising the following steps:

the communication node repeatedly transmits the downlink control channel in the time slot, or repeatedly transmits the downlink control channel in the time slot and between the time slots;

the downlink control channel is repeatedly transmitted in continuous downlink symbols in a time slot; and the repetition times of repeatedly transmitting the downlink control channel is R, and when the search space period is configured to be 1 time slot, the R is determined by the configured search space duration, wherein the R is a positive integer.

2. The method of claim 1, wherein the number of repetitions of the repeated transmission of the downlink control channel is R, and R is determined by higher layer parameter configuration.

3. Method according to claim 2, characterized in that the repetition number R only determines repetitions within a slot.

4. The method of claim 1 wherein the repeating transmission is repeated R times at a granularity of CORESET duration (CORESET) for each occasion or R times within a CORESET duration (CORESET) for a granularity of 1 symbol for each occasion.

5. The method of claim 1, wherein the transmitting is repeated in a configured occase.

6. The method of claim 5, wherein the repetition number R is determined by a configured search space duration when the search space period is configured as 1 slot.

7. The method according to claim 5, wherein the repetition number R is determined by a high-layer parameter configuration or by N/X, wherein N represents the total number of occasions configured in the time slot, and X represents the configured search space duration.

8. The method of claim 7, wherein the repeated transmissions within a slot and between slots are determined by configuring the number of repetitions R and the search space duration.

9. The method of claim 7, wherein the number of repetitions R is determined only to be repeated within a slot, and wherein the repeated transmissions are within the range of slots.

10. The method of claim 5, wherein the repeating transmission is repeated R times with the occase satisfying the requirement as a starting point and the CORESET duration as a granularity, or R times with each occase as a starting point and 1 symbol as a granularity.

11. The method of claim 10, wherein the satisfactory occase comprises at least one of: all configured occasion; the first of every R in the configured occase from the first; the first one in the occase; the first of every N/X in the configured occasion.

12. The method of claim 1, wherein the TCI state determination manner for each transmission of the downlink control channel in slot or inter-slot repeated transmission comprises one of: the same TCI state parameter is used, the TCI state parameters are used sequentially, and the TCI state parameters are used according to RRC configured pattern.

13. A method for configuring a candidate set, comprising:

the configuration mode of the candidate set candidates in the search space where the downlink control channel is located includes: configuring different numbers of candidates for different occaseons;

14. The method of claim 13, wherein the configuration comprises one of:

configuring the number of candidate sets of each aggregation level in the first occase in the time slot, wherein the number of the candidate sets of the remaining occase in the time slot is a multiple of the number of the candidate sets in the first occase;

the number of candidate sets for each aggregation level is configured as a reference value, and the ratio of the number of candidate sets for each occase to the reference value is configured.

15. A transmission apparatus of a downlink control channel, applied to a communication node, comprising:

a transmission module, configured to repeatedly transmit a downlink control channel in a time slot, or repeatedly transmit the downlink control channel in and between time slots;

16. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, is arranged to carry out the method of any one of claims 1 to 12.