CN110351009B

CN110351009B - DCI transmission and reception method, device, storage medium, base station, and terminal

Info

Publication number: CN110351009B
Application number: CN201810305389.9A
Authority: CN
Inventors: 樊婷婷; 刘萌萌; 周化雨
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2018-04-04
Filing date: 2018-04-04
Publication date: 2022-03-04
Anticipated expiration: 2038-04-04
Also published as: CN110351009A

Abstract

DCI transmission and receiving method, device, storage medium, base station, terminal, the method includes: acquiring a code word to be transmitted, wherein the code word to be transmitted is associated with the DCI; dividing the code words according to the number of the PDCCHs to obtain a plurality of sub code words, wherein the number of the sub code words is equal to the number of the PDCCHs, and the sub code words correspond to the PDCCHs one to one; for each sub-codeword, mapping the sub-codeword to a corresponding PDCCH. The scheme of the invention can fully utilize the channel conditions of different PDCCHs to transmit DCI, thereby better reducing the BLER performance of PDCCH decoding, improving decoding gain, improving decoding correctness and better meeting the requirement of URLLC on reliability.

Description

DCI transmission and reception method, device, storage medium, base station, and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a DCI transmission and reception method, apparatus, storage medium, base station, and terminal.

Background

As a major topic of New Radio (NR) technology, Ultra-high Reliable and Low Latency Communication (URLLC) systems require Ultra-high Reliable system performance and Ultra-Low system processing Latency.

In order to meet the performance requirements of the two aspects, as discussed in the current 3GPP #92 conference, when Downlink Control Information (DCI) is transmitted in the URLLC system, a method of allocating a plurality of Physical Downlink Control Channels (PDCCHs) may be used to reduce a Block Error Rate (BLER) during transmission.

However, the conventional implementation method for transmitting DCI through a plurality of PDCCHs still has a defect, and cannot fully utilize channel conditions of different PDCCHs.

Disclosure of Invention

The technical problem solved by the invention is how to fully utilize the channel conditions of different PDCCHs to transmit DCI so as to better meet the requirement of URLLC on reliability.

To solve the foregoing technical problem, an embodiment of the present invention provides a DCI transmission method, including: acquiring a code word to be transmitted, wherein the code word to be transmitted is associated with the DCI; dividing the code words according to the number of the PDCCHs to obtain a plurality of sub code words, wherein the number of the sub code words is equal to the number of the PDCCHs, and the sub code words correspond to the PDCCHs one to one; for each sub-codeword, mapping the sub-codeword to a corresponding PDCCH.

Optionally, associating the codeword to be transmitted with the DCI means: and the code word to be transmitted is obtained after the DCI is coded and rate matched.

Optionally, the mapping the sub-codeword to the corresponding PDCCH includes: determining the number of repetition times according to the number of the PDCCHs; repeating the sub code words according to the repetition times to obtain sub code words to be sent; converting the sub code word to be sent into a symbol to be sent; and mapping the symbols to be sent to the PDCCH.

Optionally, the converting the sub codeword to be transmitted into a symbol to be transmitted includes: scrambling the sub code words to be sent; and modulating the scrambled sub code words to be transmitted into the symbols to be transmitted.

Optionally, the equivalent signal-to-noise ratios of different PDCCHs are different.

Optionally, the time-frequency position of the PDCCH is determined according to a high-level signaling.

Optionally, when at least a portion of each of the multiple PDCCHs occupies the same symbol in the time domain, the multiple PDCCHs are non-overlapping in the frequency domain.

Optionally, a plurality of PDCCHs are distributed over a plurality of symbols in the time domain, and PDCCHs of different symbols may be completely or partially overlapped or not overlapped in the frequency domain.

Optionally, the PDCCH occupies one or more symbols in the time domain.

To solve the foregoing technical problem, an embodiment of the present invention further provides a DCI transmission apparatus, including: an obtaining module, configured to obtain a codeword to be sent, where the codeword to be sent is associated with the DCI; a dividing module, configured to divide the codeword according to the number of PDCCHs to obtain a plurality of sub-codewords, where the number of the sub-codewords is equal to the number of the PDCCHs, and the sub-codewords correspond to the PDCCHs one to one; and the mapping module is used for mapping each sub code word to the corresponding PDCCH.

Optionally, the mapping module includes: a determining submodule for determining the number of repetitions according to the number of PDCCHs; the repetition submodule is used for repeating the sub code words according to the repetition times so as to obtain the sub code words to be sent; a conversion submodule, configured to convert the sub codeword to be sent into a symbol to be sent; and the mapping submodule is used for mapping the symbols to be sent to the PDCCH.

Optionally, the conversion sub-module includes: a scrambling unit, configured to scramble the sub-codeword to be sent; and the modulation unit is used for modulating the scrambled sub code words to be sent into the symbols to be sent.

Optionally, the PDCCH occupies one or more symbols in the time domain.

In order to solve the above technical problem, an embodiment of the present invention further provides a DCI receiving method, including: respectively acquiring corresponding sub-code words on a plurality of PDCCHs, wherein the sub-code words correspond to the PDCCHs one by one, and the number of the acquired sub-code words is equal to that of the plurality of PDCCHs; and soft combining the plurality of sub code words and decoding to obtain the DCI.

Optionally, the time-frequency position of the PDCCH is indicated by a high layer signaling.

Optionally, the multiple PDCCHs are distributed over multiple symbols in the time domain, and PDCCHs of different symbols may be completely or partially overlapped or non-overlapped in the frequency domain.

Optionally, the PDCCH occupies one or more symbols in the time domain.

To solve the foregoing technical problem, an embodiment of the present invention further provides a DCI receiving apparatus, including: an obtaining module, configured to obtain corresponding sub-codewords on multiple PDCCHs, where the sub-codewords correspond to the PDCCHs one to one, and the number of the obtained multiple sub-codewords is equal to the number of the multiple PDCCHs; and the soft combining and decoding module is used for soft combining and decoding the plurality of sub code words to obtain the DCI.

The embodiment of the invention also provides a storage medium, wherein computer instructions are stored on the storage medium, and the computer instructions execute the steps of the method when running.

The embodiment of the present invention further provides a base station, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the steps of the DCI transmission method when executing the computer instructions.

The embodiment of the present invention further provides a terminal, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the step of the DCI receiving method when running the computer instruction.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

the embodiment of the invention provides a DCI transmission method, which comprises the following steps: acquiring a code word to be transmitted, wherein the code word to be transmitted is associated with the DCI; dividing the code words according to the number of the PDCCHs to obtain a plurality of sub code words, wherein the number of the sub code words is equal to the number of the PDCCHs, and the sub code words correspond to the PDCCHs one to one; for each sub-codeword, mapping the sub-codeword to a corresponding PDCCH. Compared with the existing PDCCH repeated transmission scheme, the sub-code words obtained by division in the embodiment of the invention are in one-to-one correspondence with the PDCCHs, so that part of contents of the code words are transmitted by different PDCCHs (namely, each PDCCH only transmits the corresponding sub-code word), thereby fully utilizing decoding gain brought by the channel environments of different PDCCHs and further reducing the error block rate of PDCCH decoding. Those skilled in the art understand that, in the scheme of the embodiment of the present invention, by performing similar interleaving processing on the code words, the code words are dispersed to different PDCCHs to a certain extent, and as different PDCCHs experience different channel conditions, the scheme of the embodiment of the present invention can better meet the requirement of URLLC on reliability without increasing decoding delay.

Further, the mapping the sub-codewords to the corresponding PDCCHs comprises: determining the number of repetition times according to the number of the PDCCHs; repeating the sub code words according to the repetition times to obtain sub code words to be sent; converting the sub code word to be sent into a symbol to be sent; and mapping the symbols to be sent to the PDCCH to obtain decoding gain brought by repeated code words and improve the decoding correctness.

Further, an embodiment of the present invention further provides a DCI receiving method, including: respectively acquiring corresponding sub-code words on a plurality of PDCCHs, wherein the sub-code words correspond to the PDCCHs one by one, and the number of the acquired sub-code words is equal to that of the plurality of PDCCHs; and soft combining the plurality of sub code words and decoding to obtain the DCI. Compared with the existing DCI receiving scheme, the terminal adopting the scheme of the embodiment of the invention respectively obtains the sub code words with different contents from the plurality of PDCCHs and then performs soft combining decoding, obtains a better decoding result by fully utilizing the channel conditions of the different PDCCHs, and ensures that the code words related to the transmitted DCI can obtain the effect similar to unequal error protection. Furthermore, the implementation of the scheme of the embodiment of the invention is simple, no additional receiving processing time delay exists, and the time delay of the URLLC service cannot be increased.

Drawings

Fig. 1 is a schematic diagram illustrating a conventional PDCCH repeated DCI transmission principle;

fig. 2 is a flowchart of a DCI transmission method according to an embodiment of the present invention;

FIG. 3 is a flowchart of one embodiment of step S103 of FIG. 2;

FIG. 4 is a schematic diagram of an exemplary application scenario of an embodiment of the present invention;

FIG. 5 is a schematic diagram of a variation of the application scenario of FIG. 4;

FIG. 6 is a schematic diagram of another exemplary application scenario of an embodiment of the present invention;

FIG. 7 is a schematic diagram of yet another exemplary application scenario of an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a DCI transmission apparatus according to an embodiment of the present invention;

fig. 9 is a flowchart of a DCI receiving method according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a DCI receiving apparatus according to an embodiment of the present invention.

Detailed Description

As known in the background art, in order to meet the requirements of high reliability and low delay of URLLC service, a scheme is proposed in the latest conference, in which a Physical Downlink Control Channel (PDCCH for short) is used for repeated transmission, and a Block Error Rate (BLER for short) is reduced when transmitting on only one PDCCH by transmitting Downlink Control Information (DCI) codes with the same content and code bits (code words for short) after Rate matching on each PDCCH.

Taking the number of PDCCHs as 2, where an Aggregation Level (AL) on each PDCCH is 4 as an example, referring to fig. 1, where in a slot, the PDCCHs are repeated twice (corresponding to PDCCH01 and PDCCH02 in the figure, respectively, where the numbers of symbols occupied by PDCCH01 and PDCCH02 may be the same or different, for example, PDCCH01 may occupy 1 symbol, and PDCCH02 may occupy 2 symbols). For codeword C obtained after encoding and rate matching DCI, based on the prior art, codeword C is repeated one copy and then placed in PDCCH01 and PDCCH02, respectively. Thus, PDCCH01 and PDCCH02 are both used to transmit the complete codeword C. Wherein, the content (resource) carried by the PDCCH (including PDCCH01 and PDCCH02) is used for scheduling a Physical Downlink Shared Channel (PDSCH); the codeword C takes 432 bits.

Although such a scheme can obtain decoding performance gain due to codeword repetition, in practical applications, especially when the frequency difference between PDCCH01 and PDCCH02 is large, the equivalent signal-to-noise ratio between different PDCCHs is different, and thus the existing PDCCH repetition transmission scheme cannot obtain decoding performance gain due to different PDCCH channel conditions.

In order to solve the foregoing technical problem, an embodiment of the present invention provides a DCI transmission method, including: acquiring a code word to be transmitted, wherein the code word to be transmitted is associated with the DCI; dividing the code words according to the number of the PDCCHs to obtain a plurality of sub code words, wherein the number of the sub code words is equal to the number of the PDCCHs, and the sub code words correspond to the PDCCHs one to one; for each sub-codeword, mapping the sub-codeword to a corresponding PDCCH.

The skilled person understands that, in the embodiment of the present invention, the sub-codewords obtained by division are in a one-to-one correspondence with the PDCCHs, so that different PDCCHs transmit a part of contents of a codeword (that is, each PDCCH transmits only a corresponding sub-codeword), thereby fully utilizing decoding gain brought by channel environments of different PDCCHs and further reducing a block error rate of PDCCH decoding.

Further, the scheme of the embodiment of the invention disperses the code words to different PDCCHs to a certain extent by carrying out similar interleaving processing on the code words, and enables the code words to additionally obtain decoding gains brought by different channel conditions along with the different PDCCHs experiencing different channel conditions. Compared with the existing scheme, the scheme of the embodiment of the invention has lower BLER and can better meet the requirement of URLLC on reliability on the basis of not increasing decoding delay.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 2 is a flowchart of a DCI transmission method according to an embodiment of the present invention. The scheme of the embodiment of the invention is also suitable for transmitting other information or signaling which needs to meet the requirements of high reliability and low time delay of the URLLC service and the like. The present embodiment may be applied to the network side, as performed by a base station on the network side.

Specifically, in this embodiment, the DCI transmission method may include the following steps:

step S101, a codeword to be sent is obtained, and the codeword to be sent is associated with the DCI.

Step S102, dividing the code words according to the number of the PDCCHs to obtain a plurality of sub code words, wherein the number of the sub code words is equal to the number of the PDCCHs, and the sub code words correspond to the PDCCHs one to one.

Step S103, for each sub codeword, mapping the sub codeword to a corresponding PDCCH.

More specifically, the association of the codeword to be transmitted with the DCI means: and the code word to be transmitted is obtained after the DCI is coded and rate matched. For example, the DCI may be processed by using an existing coding method and a rate matching method to obtain codeword bits (which may be referred to as codewords for short) that need to be transmitted through the PDCCH in this embodiment, which is not described herein again.

In order to meet the requirements of both the ultra-high reliability system performance and the ultra-low system processing delay of the URLLC system, in this embodiment, the network side may allocate a plurality of PDCCH resources to a terminal (e.g. a user equipment), that is, the PDCCH resources may be repeated multiple times on one symbol or multiple symbols of a slot (slot), for example, the PDCCH resources may be repeated multiple times on the frequency domain of one or multiple symbols, or multiple times on the time domain and the frequency domain of multiple symbols. Based on this, the implementation can divide the code word associated with the DCI into multiple parts and map the multiple parts to different PDCCHs respectively, so as to better reduce the block error rate of PDCCH decoding in the URLLC system and improve the decoding accuracy through the channel conditions of the different PDCCHs.

Further, the equivalent Signal-to-Noise Ratio (SNR or S/N) of different PDCCHs is different. As one non-limiting example, the equivalent signal-to-noise ratios of different PDCCHs may differ due to frequency selective fading.

Further, the time-frequency position of the PDCCH may be determined according to higher layer signaling. For example, the time-frequency position of each PDCCH may be indicated by Radio Resource Control (RRC) signaling.

As one non-limiting example, one PDCCH may occupy one or more symbols in the time domain.

Further, the plurality of PDCCHs do not overlap in a frequency domain when at least a portion of each of the plurality of PDCCHs occupy the same symbol in the time domain.

Further, a plurality of the PDCCHs may be distributed over a plurality of symbols in a time domain, and PDCCHs occupying different symbols may be fully or partially overlapped or non-overlapped in a frequency domain.

As a non-limiting example, referring to fig. 3, the step S103 may include the steps of:

and step S1031, determining the repetition times according to the number of the PDCCHs.

Step S1032, repeat the sub codeword according to the repetition number to obtain a sub codeword to be transmitted.

Step S1033, converting the sub code word to be transmitted into a symbol to be transmitted.

Step S1034, mapping the symbol to be transmitted to the PDCCH.

Specifically, the repetition number refers to a repetition number of the sub codeword in the corresponding PDCCH.

More specifically, by carrying multiple repeated sub-codewords within each PDCCH, the decoding performance gain due to codeword repetition can be obtained.

Further, the step S1033 may include: scrambling the sub code words to be sent; and modulating the scrambled sub code words to be transmitted into the symbols to be transmitted.

Specifically, the modulation may include Quadrature Phase Shift Keying (QPSK) modulation. In practical applications, those skilled in the art may also adopt other modulation methods according to needs, which are not described herein.

Further, in step S1034, the symbol to be transmitted may be mapped to the PDCCH according to a Control Channel Element (CCE) mapping scheme defined by a protocol (e.g., TS 38.211).

In a typical application scenario, referring to fig. 4, the number of PDCCHs is 2, and an aggregation level AL of each PDCCH is illustrated as 4. Wherein at least a portion of the PDCCH01 and at least a portion of PDCCH02 are in (i.e., occupy) the same symbol in the time domain, and the two do not overlap in the frequency domain.

For example, in the scenario shown in fig. 4, the PDCCH01 and PDCCH02 both occupy the same symbol in the time domain. Alternatively, the PDCCH01 may occupy the first symbol of a slot, and the PDCCH02 may occupy the first and second symbols of the slot, which are not overlapped in the frequency domain.

Specifically, the aggregation level is used to indicate the number of CCEs included in one PDCCH.

Taking the codeword C occupying 432 bits (bit) as an example, the number of bits of each sub-codeword can be determined according to the number of PDCCHs and the aggregation level

Specifically, in the application scenario, the codeword C is divided into 2 parts (sub-codeword C1 and sub-codeword C2) according to the number of PDCCHs, where the sizes of the sub-codeword C1 and the sub-codeword C2 are both 432 ÷ 2 ═ 216 bits (i.e., the total bits of CCEs occupied by the

PDCCHs

01 and 02, respectively).

Further, a sub codeword C1 is repeated twice to form the sub codeword C '═ C1C1 to be transmitted, the sub codeword C' to be transmitted is scrambled, then QPSK modulated into the symbol to be transmitted, and mapped onto the PDCCH 01.

Similarly, a sub-codeword C2 is also repeated twice to form the sub-codeword C ═ C2C2 to be transmitted, the sub-codeword C ″ to be transmitted is scrambled, then QPSK modulated into the symbol to be transmitted, and mapped onto the PDCCH 02.

As a variation, referring to fig. 5, a symbol to be sent associated with the sub-codeword C' to be sent may also be mapped to the PDCCH02, and a symbol to be sent associated with the sub-codeword C ″ to be sent is mapped to the PDCCH01, which may also obtain the technical effect of this embodiment.

Those skilled in the art understand that since the PDCCH01 and PDCCH02 experience different channel environments, the transmission of different sub-codewords through the two resources can introduce a decoding performance gain caused by the different channel environments, and obtain an effect similar to interleaving.

Specifically, based on the scheme of the present application scenario, after being transmitted through PDCCH01, the sub-codeword C1 is equivalent to experiencing the channel condition related to the equivalent signal-to-noise ratio 1, and after being transmitted through PDCCH02, the sub-codeword C2 is equivalent to experiencing the channel condition related to the equivalent signal-to-noise ratio 2, thereby introducing non-uniformity, performing different protections on different bits, and being equivalent to interleaving the contents transmitted through two PDCCHs.

In practical applications, the frequency fading may bring about different equivalent snr. For a deeply faded PDCCH01, consecutive burst errors may occur in transmitting the codeword, resulting in large bit interference for this block. However, based on the scheme of this embodiment, since the sub-codeword C1 is associated with the sub-codeword C2, for a receiving end (e.g., a user equipment), after receiving and soft-combining the sub-codeword C1 transmitted by the PDCCH01 and the sub-codeword C2 transmitted by the PDCCH02, respectively, the sub-codeword C2 is very strong due to the good channel condition of the PDCCH02, which may help returning the atomic codeword C1, and further decoding to obtain the codeword C.

Those skilled in the art understand that, based on the scheme of this embodiment, channel conditions of different PDCCHs can be fully utilized to obtain better decoding performance gain, and a transmission effect similar to an unequal error protection codeword is generated based on non-uniformity, so that BLER of PDCCH decoding is better reduced, and accuracy of PDCCH transmission in a URLLC system is improved.

In another exemplary application scenario of the present embodiment, referring to fig. 6, the number of PDCCHs is 3, and an aggregation level AL of each PDCCH is taken as an example for specific explanation. Wherein, the PDCCH11, PDCCH12 and PDCCH13 are in the same symbol in time domain, and the three are not overlapped in frequency domain; the equivalent signal-to-noise ratio 1 of the PDCCH11, the equivalent signal-to-noise ratio 2 of the PDCCH12, and the equivalent signal-to-noise ratio 3 of the PDCCH13 may not be the same.

Specifically, taking the codeword C occupying 432 bits (i.e. the total bits of CCEs occupied by the PDCCH11, PDCCH12, and PDCCH 13) as an example, since the number of PDCCHs in this application scenario is 3, the sizes of the sub-codeword C1, the sub-codeword C2, and the sub-codeword C3 obtained by division are 432 ÷ 3 ═ 144 bits, respectively.

Further, repeating the sub-codeword C1 three times to form the sub-codeword C ' ═ C1C1 to be transmitted, scrambling the sub-codeword C ' to be transmitted, then QPSK modulating the sub-codeword C ' into the symbol to be transmitted, and mapping the symbol to the PDCCH 11.

Similarly, a sub-codeword C2 is repeated three times to form the sub-codeword C ═ C2C2 to be transmitted, the sub-codeword C ″ to be transmitted is scrambled, then QPSK modulated into the symbol to be transmitted, and is mapped onto the PDCCH 12.

Repeating the sub codeword C3 three times to form the sub codeword C ' "to be transmitted [ C3C3], scrambling the sub codeword C '" to be transmitted, then QPSK modulating the sub codeword C ' "into the symbol to be transmitted, and mapping the symbol to the PDCCH 13.

As a variation, the sub-codeword C 'to be sent may also be mapped to the PDCCH12 or PDCCH13, the sub-codeword C ″ to be sent is mapped to the PDCCH11 or PDCCH13, and the sub-codeword C' "to be sent is mapped to the PDCCH11 or PDCCH12, which may also achieve the technical effect of this embodiment.

In another exemplary application scenario, referring to fig. 7, the number of PDCCHs is 4, and an aggregation level AL of each PDCCH is specifically described as 4. Wherein, the PDCCH21, PDCCH22, PDCCH23 and PDCCH24 are at different symbols in the time domain, PDCCHs located at different symbols (i.e., PDCCH21 and PDCCH22, PDCCH23 and PDCCH24) partially overlap in the frequency domain, and PDCCHs located at the same symbol (i.e., PDCCH21 and PDCCH24, PDCCH22 and PDCCH23) do not overlap in the frequency domain; the equivalent signal-to-noise ratio 1 of the PDCCH21, the equivalent signal-to-noise ratio 2 of the PDCCH22, the equivalent signal-to-noise ratio 3 of the PDCCH23, and the equivalent signal-to-noise ratio 4 of the PDCCH24 may not be the same.

Specifically, taking the codeword C occupying 432 bits (i.e. the total bits of CCEs occupied by the PDCCH21, PDCCH22, PDCCH23 and PDCCH24) as an example, since the number of PDCCHs in the present application scenario is 4, the sizes of the sub-codeword C1, the sub-codeword C2, the sub-codeword C3 and the sub-codeword C4 obtained by division are 432 ÷ 4 ÷ 108 bits, respectively.

Further, a sub codeword C1 is repeated four times to form the sub codeword C 'to be transmitted, [ C1C1], and the sub codeword C' to be transmitted is scrambled, QPSK modulated into the symbol to be transmitted, and mapped onto the PDCCH 21.

Similarly, a sub codeword C2 is repeated four times to form the sub codeword C ″ ([ C2C2 ]), the sub codeword C ″ to be transmitted is scrambled, then QPSK modulated into the symbol to be transmitted, and mapped onto the PDCCH 22.

Repeating the sub-codeword C3 four times to form the sub-codeword C ' "to be transmitted [ C3C3], scrambling the sub-codeword C '" to be transmitted, then QPSK modulating the sub-codeword C ' "to be the symbol to be transmitted, and mapping the symbol to the PDCCH 23.

Repeating the sub-codeword C4 four times to form the sub-codeword C "" ═ C4C4 "to be transmitted, scrambling the sub-codeword C" ", then QPSK modulating the sub-codeword C" "to be transmitted to the symbol to be transmitted, and mapping the symbol to the PDCCH 24.

As a variation, the sub-codeword C' to be transmitted may also be mapped to the PDCCH22 or PDCCH23 or PDCCH24, the sub-codeword C ″ to be transmitted is mapped to the PDCCH21 or PDCCH23 or PDCCH24, the sub-codeword C ″ to be transmitted is mapped to the PDCCH21 or PDCCH22 or PDCCH24, and the sub-codeword C "" to be transmitted is mapped to the PDCCH21 or PDCCH22 or PDCCH23, which may also achieve the technical effect of this embodiment.

Further, after the DCI is dispersedly mapped to the resources of the multiple PDCCHs by the scheme of this embodiment, the DCI is transmitted through the PDCCHs, thereby implementing the DCI transmission operation.

By adopting the scheme of the embodiment, because the sub-code words obtained by division in the embodiment of the present invention are in one-to-one correspondence with the PDCCHs, different PDCCHs transmit a part of the contents of the code words (i.e., each PDCCH transmits only the corresponding sub-code word), so that the decoding gain brought by the channel environments of different PDCCHs is fully utilized, and the block error rate of PDCCH decoding is further reduced.

Further, the scheme of the embodiment of the present invention performs similar interleaving processing on the code words, and disperses the code words to different PDCCHs to a certain extent, and as different PDCCHs experience different channel conditions, the scheme of the embodiment of the present invention can better meet the requirement of URLLC on reliability without increasing decoding delay.

Fig. 8 is a schematic structural diagram of a DCI transmission apparatus according to an embodiment of the present invention. Those skilled in the art understand that the DCI transmitting device 3 according to this embodiment is used to implement the method solutions described in the embodiments shown in fig. 2 to fig. 7.

Specifically, in this embodiment, the DCI transmitting apparatus 3 may include: an obtaining module 31, configured to obtain a codeword to be sent, where the codeword to be sent is associated with the DCI; a dividing module 32, configured to divide the codeword according to the number of PDCCHs to obtain a plurality of sub-codewords, where the number of the sub-codewords is equal to the number of the PDCCHs, and the sub-codewords correspond to the PDCCHs one to one; and a mapping module 33 for mapping each sub codeword to a corresponding PDCCH.

Further, the associating the codeword to be transmitted with the DCI may refer to: and the code word to be transmitted is obtained after the DCI is coded and rate matched.

Further, the mapping module 33 may include: a determining submodule 331, configured to determine a repetition number according to the number of PDCCHs; a repetition submodule 332, configured to repeat the sub codeword according to the repetition times to obtain a sub codeword to be sent; a conversion submodule 333, configured to convert the sub codeword to be sent into a symbol to be sent; a mapping submodule 334, configured to map the symbols to be sent to the PDCCH.

Further, the conversion sub-module 333 may include: a scrambling unit 3331, configured to scramble the sub code words to be sent; a modulating unit 3332, configured to modulate the scrambled sub codeword to be sent into the symbol to be sent.

Further, the equivalent signal-to-noise ratio may be different for different PDCCHs.

Further, the time-frequency position of the PDCCH may be determined according to higher layer signaling.

Further, a plurality of the PDCCHs may be distributed over a plurality of symbols in a time domain, and PDCCHs of different symbols may be fully or partially overlapped or non-overlapped in a frequency domain.

Further, the PDCCH may occupy one or more symbols in the time domain.

For more details of the operation principle and the operation mode of the DCI transmission device 3, reference may be made to the description in fig. 2 to fig. 7, which is not repeated here.

Fig. 9 is a flowchart of a DCI receiving method according to an embodiment of the present invention. The scheme of the embodiment of the invention is also suitable for transmitting other information or signaling which needs to meet the requirements of high reliability and low time delay of the URLLC service and the like. The present embodiment may be applied to the terminal side, as performed by the user equipment.

Specifically, in this embodiment, the DCI receiving method may include the following steps:

step S201, obtaining corresponding sub-codewords on a plurality of PDCCHs, respectively, where the sub-codewords correspond to the PDCCHs one to one, and the number of the obtained sub-codewords is equal to the number of the plurality of PDCCHs.

Step S202, the plurality of sub code words are soft combined and decoded to obtain the DCI.

More specifically, the explanation of the terms in the present embodiment may refer to the related descriptions in fig. 2 to fig. 7, which are not repeated herein.

Further, the sub-codeword may be a symbol to be transmitted mapped to a corresponding PDCCH based on the methods described in fig. 2 to fig. 7. For example, a corresponding symbol to be transmitted is obtained from each PDCCH, and the symbol to be transmitted is converted and demodulated to a corresponding sub-codeword, so as to obtain the sub-codeword corresponding to the PDCCH.

Further, the decoding operation may be performed in an existing decoding manner.

Further, the time-frequency position of the PDCCH may be indicated by high layer signaling.

Further, the multiple PDCCHs may be distributed over multiple symbols in the time domain, and PDCCHs of different symbols may be fully or partially overlapped or non-overlapped in the frequency domain.

Further, the PDCCH may occupy one or more symbols in the time domain.

As described above, with the scheme of this embodiment, the DCI transmitted based on the schemes in fig. 2 to fig. 7 can be received, the terminal obtains the sub-codewords with different contents from the multiple PDCCHs respectively and then performs soft combining and decoding, and obtains a better decoding result by fully utilizing the channel conditions of the different PDCCHs, so that the codeword associated with the transmitted DCI can obtain the effect similar to unequal error protection.

Moreover, the implementation of the scheme of the embodiment is simple, no extra receiving processing time delay exists, and the time delay of the URLLC service cannot be increased.

Fig. 10 is a schematic structural diagram of a DCI receiving apparatus according to an embodiment of the present invention. Those skilled in the art understand that the DCI receiving apparatus 4 according to this embodiment is used to implement the method technical solution described in the embodiment shown in fig. 9.

Specifically, in this embodiment, the DCI receiving apparatus 4 may include: an obtaining module 41, configured to obtain corresponding sub-codewords on multiple PDCCHs, where the sub-codewords correspond to the PDCCHs one to one, and the number of the obtained multiple sub-codewords is equal to the number of the multiple PDCCHs; and a soft combining and decoding module 42, configured to soft combine and decode the multiple sub-code words to obtain the DCI.

Further, the PDCCH may occupy one or more symbols in the time domain.

For more details of the operation principle and the operation mode of the DCI receiving apparatus 4, reference may be made to the description in fig. 9, which is not repeated here.

Further, the embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the technical solutions of the methods in the embodiments shown in fig. 2 and fig. 9 are executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The storage medium may include ROM, RAM, magnetic or optical disks, etc.

Further, the embodiment of the present invention further discloses a base station, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the technical solution of the method in the embodiment shown in fig. 2 when executing the computer instructions.

Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the technical solution of the method in the embodiment shown in fig. 9 when running the computer instruction. Preferably, the terminal may be the User Equipment (UE).

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for transmitting Downlink Control Information (DCI), comprising:

acquiring a codeword to be transmitted, wherein the codeword to be transmitted is associated with the DCI, and the association of the codeword to be transmitted with the DCI means that: the code word to be transmitted is obtained after the DCI is coded and rate matched;

dividing the code words according to the number of Physical Downlink Control Channels (PDCCH) to obtain a plurality of sub-code words, wherein the number of the sub-code words is equal to the number of the PDCCH, and the sub-code words correspond to the PDCCH one by one;

for each sub-codeword, mapping the sub-codeword to a corresponding PDCCH.

2. The DCI transmission method of claim 1, wherein the mapping the sub-codewords to corresponding PDCCHs comprises:

determining the number of repetition times according to the number of the PDCCHs;

repeating the sub code words according to the repetition times to obtain sub code words to be sent;

converting the sub code word to be sent into a symbol to be sent;

and mapping the symbols to be sent to the PDCCH.

3. The DCI transmission method of claim 2, wherein converting the sub-codeword to be transmitted into a symbol to be transmitted comprises:

scrambling the sub code words to be sent;

and modulating the scrambled sub code words to be transmitted into the symbols to be transmitted.

4. The DCI transmission method of any of claims 1 to 3, wherein equivalent signal-to-noise ratios of different PDCCHs are different.

5. The DCI transmission method of any of claims 1 to 3, wherein the time-frequency location of the PDCCH is determined according to higher layer signaling.

6. The DCI transmission method according to claim 5, wherein the plurality of PDCCHs do not overlap in a frequency domain when at least a part of each of the plurality of PDCCHs occupies the same symbol in the time domain.

7. The DCI transmission method according to claim 5, wherein a plurality of the PDCCHs are distributed over a plurality of symbols in a time domain, and PDCCHs of different symbols may be wholly or partially overlapped or non-overlapped in a frequency domain.

8. The DCI transmission method of claim 5, wherein the PDCCH occupies one or more symbols in a time domain.

9. A DCI transmission apparatus, comprising:

an obtaining module, configured to obtain a codeword to be sent, where the codeword to be sent is associated with the DCI, where the association of the codeword to be sent with the DCI means: the code word to be transmitted is obtained after the DCI is coded and rate matched;

a dividing module, configured to divide the codeword according to the number of PDCCHs to obtain a plurality of sub-codewords, where the number of the sub-codewords is equal to the number of the PDCCHs, and the sub-codewords correspond to the PDCCHs one to one;

and the mapping module is used for mapping each sub code word to the corresponding PDCCH.

10. The DCI transmission apparatus of claim 9, wherein the mapping module comprises:

a determining submodule for determining the number of repetitions according to the number of PDCCHs;

the repetition submodule is used for repeating the sub code words according to the repetition times so as to obtain the sub code words to be sent;

a conversion submodule, configured to convert the sub codeword to be sent into a symbol to be sent;

and the mapping submodule is used for mapping the symbols to be sent to the PDCCH.

11. The DCI transmission apparatus of claim 10, wherein the conversion sub-module comprises:

a scrambling unit, configured to scramble the sub-codeword to be sent;

and the modulation unit is used for modulating the scrambled sub code words to be sent into the symbols to be sent.

12. The DCI transmission apparatus of any one of claims 9 to 11, wherein the equivalent signal-to-noise ratios of different PDCCHs are different.

13. The DCI transmission apparatus of any one of claims 9 to 11, wherein the time-frequency location of the PDCCH is determined according to higher layer signaling.

14. The DCI transmission apparatus of claim 13, wherein the plurality of PDCCHs do not overlap in the frequency domain when at least a portion of each of the plurality of PDCCHs occupies the same symbol in the time domain.

15. The DCI transmission apparatus of claim 13, wherein the PDCCHs are distributed over a plurality of symbols in the time domain, and the PDCCHs of different symbols may overlap in whole or in part or not in the frequency domain.

16. The DCI transmission apparatus of claim 13, wherein the PDCCH occupies one or more symbols in the time domain.

17. A DCI receiving method, comprising:

respectively acquiring corresponding sub-code words on a plurality of PDCCHs, wherein the sub-code words correspond to the PDCCHs one by one, and the number of the acquired sub-code words is equal to that of the plurality of PDCCHs, and the plurality of sub-code words are obtained by dividing the DCI after coding and rate matching;

and soft combining the plurality of sub code words and decoding to obtain the DCI.

18. The DCI receiving method of claim 17, wherein equivalent signal-to-noise ratios for different PDCCHs are different.

19. The DCI receiving method of claim 17, wherein the time-frequency location of the PDCCH is indicated by higher layer signaling.

20. The DCI receiving method of claim 19, wherein the plurality of PDCCHs are non-overlapping in the frequency domain when at least a portion of each of the plurality of PDCCHs occupies the same symbol in the time domain.

21. The DCI receiving method of claim 19, wherein the plurality of PDCCHs are distributed over a plurality of symbols in a time domain, and PDCCHs of different symbols may be fully or partially overlapped or non-overlapped in a frequency domain.

22. The DCI receiving method of claim 19, wherein the PDCCH occupies one or more symbols in the time domain.

23. A DCI receiving apparatus, comprising:

an obtaining module, configured to obtain corresponding sub-codewords on multiple PDCCHs respectively, where the sub-codewords correspond to the PDCCHs one to one, and the number of the obtained sub-codewords is equal to the number of the multiple PDCCHs, and the multiple sub-codewords are obtained by dividing the DCI after encoding and rate matching; and the soft combining and decoding module is used for soft combining and decoding the plurality of sub code words to obtain the DCI.

24. A storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the method of any one of claims 1 to 8.

25. A base station comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 1 to 8.

26. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 17 to 22.