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CN110278614B - Data channel transmission method and device - Google Patents

Data channel transmission method and device Download PDF

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Publication number
CN110278614B
CN110278614B CN201910549726.3A CN201910549726A CN110278614B CN 110278614 B CN110278614 B CN 110278614B CN 201910549726 A CN201910549726 A CN 201910549726A CN 110278614 B CN110278614 B CN 110278614B
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transmission
symbols
mode
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symbol
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CN110278614A (en
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张雯
闫琦
李晖
柯熙政
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Xian University of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

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  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a transmission method of a data channel, which comprises the following specific implementation modes: the transmission equipment receives the scheduling information or the transmission equipment receives the scheduling information and the Radio Resource Control (RRC) signaling, and determines at least one of the following information: an index S of the starting transmission symbol; the number of time intervals K; the number of symbols L contained in each time interval; a transmission mode; modulation order in the transmission; the number of transmission layers; a precoding matrix; TBS of the transmission data; then, transmitting data in the transmission mode on continuous K x L symbols starting from the initial transmission symbol; wherein, the transmission mode is one-time transmission or continuous M-time repeated transmission, S is more than or equal to 0 and less than or equal to 13, M is more than or equal to 2, K is more than or equal to 1, and L is more than or equal to 1 and less than or equal to 14. The method can meet the requirements of both time delay and reliability. The invention also provides a transmission device of the data channel, which comprises a receiving unit and a transmission unit, and the device realizes data transmission by the transmission method of the data channel.

Description

Data channel transmission method and device
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a data channel transmission method and a data channel transmission device.
Background
The 5G network is a fifth generation mobile communication network, and its peak theoretical transmission speed can reach 10Gb per second. The 3GPP defines three major scenarios of 5G. The eMBB (enhanced Mobile Broadband) refers to a large-flow Mobile Broadband service such as 3D/Ultra-high-definition video, the mMTC refers to a large-scale Internet of things (Massive Machine Type of Communication), and the URLLC refers to a service requiring Low-delay and high-reliability connection, such as unmanned driving and industrial automation.
In 6 months 2018, the international organization for standardization 3GPP (TSG #80) approved the fifth generation mobile communication technology standard (5G NR) independent networking function freezing. In addition to the non-independent networking NR standard completed in 12 months of 2017, 5G has completed the first stage full-function standardization work. In the subsequent R-16 version, the enhancement technique in 5G will continue to be standardized.
In the 3GPP global meeting of 6 months in 2018, si (study item) about URLLC is established, and how to realize ultra-high-reliability and ultra-low-latency communication in 5G is studied. In the existing mobile communication standard, a transmission mode of multi-subframe repeated transmission is defined, and the reliability of data is improved to a certain extent by the repeated transmission of a plurality of subframes. However, each transmission time and the total transmission time are long, and the transmission can only be performed from the starting symbol of the subframe, which cannot meet the requirement of ultra-low delay. The existing mobile communication standard also stipulates a transmission mode with short time intervals, the duration of one-time transmission is short, and the time delay is reduced to a certain extent. However, in this method, the transmission duration is limited, and flexible switching cannot be performed through physical layer signaling, and the starting position of transmission can only be on a fixed symbol in one subframe, and transmission cannot be started immediately on any symbol of the subframe according to the service requirement, so the effect of reducing delay is greatly reduced. In addition, this approach does not enable highly reliable transmission. Therefore, there is no solution for communication that can satisfy both ultra-high reliability and ultra-low latency in the existing standards.
Disclosure of Invention
The invention aims to provide a data channel transmission method, and provides a short-duration segmented transmission scheme which can start transmission from any symbol of a time slot and flexibly adjust by combining the capacity of a transmission device, the position of the time slot and the like aiming at the problems in the prior art, and can meet the requirements of both time delay and reliability.
Another object of the present invention is to provide a transmission apparatus of a data channel.
The technical scheme adopted by the invention is as follows: a transmission method of a data channel is specifically implemented as follows:
firstly, the transmission device receives scheduling information or the transmission device receives scheduling information and radio resource control RRC signaling, and determines at least one of the following information:
an index S of the starting transmission symbol;
the number of time intervals K;
the number of symbols L contained in each time interval;
a transmission mode;
modulation order in the transmission;
the number of transmission layers;
a precoding matrix;
TBS of the transmission data;
then, transmitting data in the transmission mode on continuous K x L symbols starting from the initial transmission symbol;
the transmission mode is one-time transmission or continuous M-time repeated transmission, S is more than or equal to 0 and less than or equal to 13, M is more than or equal to 2, K is more than or equal to 1, and L is more than or equal to 1 and less than or equal to 14.
The invention is also characterized in that:
the value of L is one of the following values:
l belongs to the set {2,3,4,7 };
l is an even number;
l is a power of 2.
When the transmission mode is continuous M times of repeated transmission, the transmission mode comprises one of the following modes:
the method a: transmitting data once on all symbols within each of the slots and belonging to the K x L symbols when the K x L symbols span multiple slots;
mode b: transmitting data once per time interval;
mode c: when all symbols in a time interval are in a time slot, transmitting data once in the time interval, when the time interval spans two time slots, transmitting data once in symbols corresponding to part of the time interval in the previous time slot, and transmitting data once in symbols corresponding to the rest of the time interval in the next time slot;
mode d: transmitting data once in a first time interval, and for K-1 time intervals later, transmitting data once in the time interval when all symbols in the time interval are in one time slot, transmitting data once in symbols corresponding to part of the time interval in a front time slot and transmitting data another time in symbols corresponding to the rest time intervals in a rear time slot when the time interval spans two time slots;
mode e: when said K x L symbols span a plurality of slots, for all symbols within each of said slots and belonging to said K x L symbols, transmitting data once every L symbols, starting with the first symbol, and if there are remaining symbols within said slot, less than L in number, then transmitting data once again on said remaining symbols;
mode f: transmitting data once at each preset interval in the K x L symbols, and transmitting data once at the truncated preset interval when a start symbol or an end symbol of data transmission does not coincide with the start symbol or the end symbol of the preset interval;
wherein the time interval is a period of time that sequentially divides K x L symbols into K symbols of duration L symbols.
In the method f, the preset interval includes one of the following:
(1) the preset interval is that every L symbols in each time slot are divided into a preset interval from a first symbol, and if the time slot has the remaining symbols with the number less than L, the remaining symbols form a preset interval;
(2) the preset interval is that each subframe is divided into a preset interval from a first symbol, every L symbols, and if the subframe has the remaining symbols with the number less than L, the remaining symbols form a preset interval;
(3) the preset interval is that each wireless frame is divided into a preset interval from a first symbol, every L symbols, and if the wireless frame has the symbols with the number less than L, the rest symbols form a preset interval.
The determination of the transmission mode comprises one of the following:
(1) the transmission equipment determines the transmission mode according to at least one value of the K, S and the L;
(2) the transmission equipment determines a transmission mode according to at least one of indication information contained in the scheduling information and indication information in RRC signaling, wherein the RRC signaling contains a set of transmission modes, and the set comprises a mode a, a mode b, a mode c, a mode d, a mode e and a mode f when the transmission modes and continuous M times of repeated transmission are carried out; the indication information contained in the scheduling information and the indication information in the RRC signaling indicate one transmission mode in the set.
When the transmission device determines the transmission mode according to at least one value of the K, S and the L, the following is specific:
(1) when determining the transmission mode according to the value of K, the transmission mode comprises one of the following modes:
when K is 1, the transmission mode is to transmit data once, otherwise, the transmission mode is to repeatedly transmit data M times in sequence;
when K is 1, the transmission mode is the mode a, otherwise, the transmission mode is one of the modes b, c, d, e and f;
when K is 1, the transmission mode is the mode a or d, otherwise, the transmission mode is one of the modes b, c, e and f;
(2) when determining the transmission mode according to the values of L and S, the transmission mode comprises one of the following modes:
when the 14-S is less than or equal to alpha.L, the transmission mode is to transmit data once, otherwise, the transmission mode is to repeatedly transmit data for M times in sequence;
when 14-S is less than or equal to alpha.L, the transmission mode is the mode a, otherwise, the transmission mode is one of the modes b, c, d, e and f;
when 14-S is less than or equal to alpha.L, the transmission mode is the mode a or d, otherwise, the transmission mode is one of the modes b, c, e and f;
wherein alpha is a positive number and is less than or equal to 1.
Assuming that a first transmission is a transmission having the largest number of transmission symbols among M consecutive repeated transmissions, and a second transmission is a transmission other than the first transmission among the M consecutive repeated transmissions;
when the transmission mode is continuous M times of repeated transmission, the method for determining the modulation order is as follows:
let Qm0Modulation order, Q, corresponding to the first transmissionm1For the modulation order corresponding to the second transmission, then: qm1≥Qm0(ii) a And Qm0Is indicated in the scheduling information, Qm1The determination of (c) includes one of:
(1)Qm1from Qm0、L1And L0Wherein L is0Number of transmission symbols, L, corresponding to the first transmission1The specific determination for the number of transmission symbols corresponding to the second transmission may include one of:
Qm1＝min(Qm0+2，C1)；
Figure BDA0002105140530000061
Figure BDA0002105140530000062
wherein, C1Has a value of 8 or 6, C2Has a value of 4 or 8;
Figure BDA0002105140530000064
which means that the rounding is made up,
Figure BDA0002105140530000063
represents rounding down; n is a radical ofDMRS0Number of symbols occupied by demodulation reference signals corresponding to the first transmission, NDMRS0Is a non-negative integer, and NDMRS0＜L0；NDMRS1Number of symbols occupied by demodulation reference signals corresponding to the second transmission, NDMRS1Is a non-negative integer, and NDMRS1＜L1；
(2)Qm1Is notified by the base station through the scheduling information or RRC signaling, andthe scheduling information includes Qm0And Qm1Relative Qm0The offset information of (1).
When the transmission mode is continuous M times of repeated transmission, the method for determining the number of transmission layers and the precoding matrix is as follows:
(1) the method for determining the number of transmission layers specifically comprises the following steps:
let R0Number of layers, R, corresponding to the first transmission1For the number of layers corresponding to the second transmission, then: r1≥R0(ii) a And R is0Is indicated in the scheduling information, R1The determination of (c) includes one of:
1)R1from R0、L0And L1The specific determination mode comprises one of the following steps:
R1＝min(R0+1，C2)；
Figure BDA0002105140530000071
Figure BDA0002105140530000072
R1＝min(R0+x，C2) Wherein
Figure BDA0002105140530000073
R1＝min(R0+x，C2) Wherein
Figure BDA0002105140530000074
wherein, C2The value of (a) is the maximum number of layers that the transmission device can send, and is 4 or 8;
Figure BDA0002105140530000075
which means that the rounding is made up,
Figure BDA0002105140530000076
represents rounding down;
2)R1the base station notifies the scheduling information or RRC signaling, and the scheduling information contains R0And R1Relative to R0Offset information of (2);
(2) the method for determining the precoding matrix specifically comprises the following steps:
let W0Precoding matrix corresponding to the first transmission, W1A precoding matrix corresponding to the second transmission; the base station includes W in the scheduling information0The transmission apparatus obtains W by receiving the scheduling information0The transmission device determines W1The method of (1) is one of the following:
1) the transmission device is according to W0Determining W1，W1For the number of transmission layers to be R1Front R in corresponding precoding matrix set0Column is W0The precoding matrix of (a);
2)W1is a preset precoding matrix;
3) the base station informs a plurality of precoding matrixes corresponding to different transmission layer numbers in RRC signaling, and the transmission equipment is used for transmitting the precoding matrixes according to the R1And selecting the corresponding precoding matrix.
When the transmission mode is M times of continuous repeated transmission, the method for determining the TBS of the transmission data is as follows:
the transmission device generates RE number according to the designated symbol number X, and then generates TBS of transmission data according to the RE number, wherein the designated symbol number X is one of the following:
L；
min(Ti)，i＝1，2，…，M；
max(Ti)，i＝1，2，…，M；
Figure BDA0002105140530000081
Figure BDA0002105140530000082
K·L；
wherein, TiThe number of symbols corresponding to the ith transmission in the M consecutive repeated transmissions,
Figure BDA0002105140530000094
which means that the rounding is made up,
Figure BDA0002105140530000095
represents rounding down;
the calculation formula of RE number is:
NRE＝min(156，N′RE)·nPRB
wherein,
Figure BDA0002105140530000091
Figure BDA0002105140530000092
is notified by the scheduling information and,
Figure BDA0002105140530000093
is RRC signaled.
The other technical scheme adopted by the invention is as follows: a transmission apparatus of a data channel, comprising:
a receiving unit, configured to receive the scheduling information or the scheduling information and the RRC signaling, and determine at least one of the following information:
the index S of the initial transmission symbol, the time interval number K, the symbol number L contained in each time interval, the transmission mode, the modulation order in transmission, the transmission layer number, the precoding matrix and the TBS of transmission data;
and the transmission unit is used for transmitting data on continuous K x L symbols starting from the initial transmission symbol according to the transmission mode.
The invention has the beneficial effects that: the method of the invention provides a transmission scheme which can start transmission from any symbol of a time slot and flexibly adjust the transmission scheme by combining the channel condition of the transmission equipment, the capacity of the transmission equipment, the position of the time slot and the like, and can meet the requirements of both time delay and reliability. And further provides the determination mode of TBS, modulation order and the like in the transmission method. The transmission method provided by the invention is not limited to be used in the URLLC scene, is not limited to be used in a 5G system, and can also be used in other data transmission scenes.
Drawings
FIG. 1 is a schematic diagram of a first transmission of the present invention;
FIG. 2 is a diagram of a second transmission according to the present invention;
FIG. 3 is a third schematic transmission diagram of the present invention;
FIG. 4 is a schematic diagram of a fourth transmission according to the present invention;
fig. 5 is a diagram illustrating a fifth transmission scheme according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a transmission device of a data channel, comprising: a receiving unit, configured to receive the scheduling information or the scheduling information and the RRC signaling, and determine at least one of the following information: the index S of the initial transmission symbol, the time interval number K, the symbol number L contained in each time interval, the transmission mode, the modulation order in transmission, the transmission layer number, the precoding matrix and the TBS of transmission data;
a transmission unit, configured to transmit data in the transmission manner over K × L consecutive symbols starting from a start transmission symbol; the transmission device of the data channel realizes data transmission based on the following transmission method of the data channel.
The transmission device may be a UE (User Equipment).
The invention also provides a data transmission method, which can be a sending method or a receiving method. The transmitted data may be uplink data or downlink data. The Channel for transmitting data may be a PUSCH (Physical Uplink Shared Channel) or a PDSCH (Physical Downlink Shared Channel). Without loss of generality, the following transmission method is described by taking the PUSCH as an example of a channel for transmitting data, and the method of the present invention may also be applied to the PDSCH. In the present invention, transmitting data once and transmitting PUSCH once are equivalent concepts.
The invention relates to a transmission method of a data channel, which has the following specific implementation mode:
firstly, the transmission device receives scheduling information or the transmission device receives scheduling information and radio resource control RRC signaling, and determines at least one of the following information:
an index S of the starting transmission symbol;
the number of time intervals K;
the number of symbols L contained in each time interval;
a transmission mode;
modulation order in the transmission;
the number of transmission layers;
a precoding matrix;
TBS of the transmission data;
then, transmitting data in the transmission mode on continuous K x L symbols starting from the initial transmission symbol;
the transmission mode is one-time transmission or continuous M-time repeated transmission, S is more than or equal to 0 and less than or equal to 13, M is more than or equal to 2, K is more than or equal to 1, and L is more than or equal to 1 and less than or equal to 14.
The value of L is one of the following values:
1) l belongs to a set {2,3,4,7}, the number of the symbols is the segment time interval discussed by the 4G topic, and the forward compatibility is good;
2) l is an even number, such as 2, 4, 6, 8, 10 and the like, and the partitions are mutually nested, so that the position alignment of demodulation reference signals is facilitated;
3) l is a power of 2, such as 2, 4, 8 and the like, and the partitions are nested with each other, so that the demodulation reference signal position alignment is facilitated.
The PUSCH here is a self-decodable PUSCH. The starting transmission symbol may be any symbol within one slot. The symbol here may be an actual physical transmission symbol, or may be an available symbol that can be used for transmitting PUSCH. For example, the index of 14 symbols included in a slot is 0 to 13, and the last symbol is used for transmitting SRS (Sounding Reference Signal), so that only symbols 0 to 12 are available for transmitting PUSCH. When the symbol is an actual physical transmission symbol, the UE may transmit on K × L physical symbols, or may transmit only on available symbols of the K × L physical symbols, for example, not transmit the PUSCH on a downlink symbol or a PUCCH used for transmitting the SRS.
In the method of the present invention described above, the base station may schedule the UE to perform one transmission or M consecutive transmissions according to the channel condition of the UE (User Equipment, that is, the transmission device) and the size of the data to be transmitted. When the data to be transmitted is large and the UE channel is very good, the data may be transmitted once on K × L symbols, for example, K ═ 2 and L ═ 10, and then all the data may be transmitted once on 2 × 10 ═ 20 symbols. Simulations have shown that a transmission with a long duration (more than one slot) performs better than a transmission divided into multiple transmissions in the very good case of a large TBS channel. When the data to be transmitted is small and the channel condition of the UE is common, the data can be transmitted in small packets for multiple times, and after the base station receives the data correctly, the base station can send and receive correct signaling to terminate the sending of the UE in advance. Simulations show that multiple repeated transmissions with a small TBS generally or poorly perform better than one transmission. In this method, the start symbol may be any symbol of a slot, so that the URLLC traffic arrives immediately for scheduled transmission.
Given the specific transmission scheme below, the UE may transmit using one of the following. In the following description, it is assumed that K × L symbols are sequentially divided into K time intervals of duration L symbols.
The first method is as follows: the UE transmits the PUSCH once on K × L consecutive symbols, which is self-decodable. The method is a solution when the TBS is large, and can transmit data to be transmitted in a proper time under the condition of ensuring a code rate. One way is the one-time transmission way described above.
The second method comprises the following steps: when K × L symbols span multiple slots, data is transmitted once on all symbols within each slot and belonging to K × L symbols. For example, if the starting symbol is symbol #7 of slot #1, K is 4, and L is 7, the transmission has a total of 28 symbols, spans 3 slots, and then repeats the transmission 3 times. As shown in fig. 1, this scheme is also a solution when the TBS is large, and in this scheme, one transmission ends at the end of the slot, without additionally increasing the processing capability of the UE.
The third method comprises the following steps: the UE transmits data once per time interval. For example, assuming that the starting symbol S is symbol #12 of slot #1, K is 3, and L is 4, the UE transmits a PUSCH, which is self-decoded, once on symbols #12 and 13 of slot #1 and symbols 0 and 1 of slot # 2; transmitting a PUSCH once on symbols # 2-5 of slot #2, the PUSCH being self-decoded; the PUSCH, which is self-decoded, is transmitted once on symbols # 6-9 of slot # 2. The method has less time for one-time transmission and can ensure the low time delay characteristic of data. And through K times of transmission, the reliability of data transmission is improved.
The method is as follows: when all symbols in a time interval are in a time slot, transmitting data once in the time interval, when the time interval spans two time slots, transmitting data once in the symbols corresponding to part of the time interval of the previous time slot, and transmitting data once in the symbols corresponding to the rest time interval of the next time slot; for example, if the starting symbol is symbol #8 of slot #1, K is 3, and L is 4, and slot #1 and slot #2 are spanned by the second time interval, PUSCH is transmitted once on the first two symbols of slot #1 and once on the last two symbols of slot #2 for the time interval, and the transmission is repeated 4 times, as shown in fig. 2, each rectangular cell represents one symbol, and the diagonally filled symbol, the dotted filled symbol, the grid filled symbol, and the gray filled symbol represent four times PUSCH transmitted, respectively. Therefore, the UE does not transmit across time slots, and the processing capability of the UE is not increased while the requirements on time delay and reliability are met.
The fifth mode is as follows: the UE transmits data once in a first time interval, and for K-1 time intervals later, when all symbols in one time interval are in one time slot, the data is transmitted once in the time interval, when the time interval spans two time slots, the data is transmitted once in the symbols corresponding to part of the time interval of the previous time slot, and the data is transmitted another time in the symbols corresponding to the rest time interval of the later time slot; for example, if the starting symbol is symbol #12 of slot #1, K is 3, and L is 7, then the first and third time intervals span two slots, then the UE transmits PUSCH once in the first time interval, transmits PUSCH once in the first two symbols and transmits PUSCH another time in the last five symbols in the third time interval, and repeats the transmission 4 times, as shown in fig. 3. Therefore, the code rate of the first transmission is not too high, and the reliability of the first transmission is ensured.
The method six: when the K x L symbols span a plurality of time slots, transmitting data once every L symbols starting from the first symbol for all symbols in each time slot and belonging to the K x L symbols, and if there are remaining symbols in the time slot with a number less than L, transmitting data once again on the remaining symbols; for example, as shown in fig. 4, the start symbol is symbol #4 of slot #1, K is 4, and L is 4. The transmission symbols span 2 slots, and then, starting with the starting transmission symbol of slot #1, PUSCH is transmitted once every 4 symbols and once on the remaining last two symbols of slot # 1. Similarly, PUSCH is transmitted once every 4 symbols on slot #2, and once on the remaining two symbols, i.e., symbols #4 and 5. In the method, the mode that the transmission symbol is 4 is adopted as far as possible to transmit, so that the transmission quality is ensured.
The method is as follows: for different values of L, a slot is divided into a number of predetermined intervals in a predetermined manner.
The preset interval may be divided in one of the following ways:
(1) the preset interval is that every L symbols in each time slot are divided into a preset interval from a first symbol, and if the time slot has the remaining symbols with the number less than L, the remaining symbols form a preset interval;
(2) the preset interval is that each subframe is divided into a preset interval from a first symbol, every L symbols, if the subframe has the remaining symbols with the number less than L, the remaining symbols form a preset interval;
(3) the preset interval is that each wireless frame is divided into a preset interval from a first symbol, every L symbols, and if the wireless frame has a number of remaining symbols less than L, the remaining symbols form a preset interval.
For example, when L is 7, a slot including 14 symbols is divided into 2 preset intervals. For another example, when L is 4, every four symbols of a slot are divided into a preset interval, and the last two symbols correspond to a preset interval.
The transmission mode of the seventh mode is to transmit data once at every preset interval of K × L symbols. And when the starting symbol or the ending symbol of the data transmission does not coincide with the starting symbol or the ending symbol of the preset interval, transmitting the data once at the truncated preset interval. For example, assuming that S is 10, K is 5, and L is 7, as shown in fig. 5, the lower bidirectional arrow indicates a preset interval, the UE transmits PUSCH 5 times in total, the first transmission only occupies 4 symbols of one preset interval, and then PUSCH is transmitted once on the four symbols. The last transmission occupies only four symbols of one preset interval, and the PUSCH is transmitted once on these three symbols.
In this way, when there are multiple URLLC UEs in the system, the positions of each transmission (except for the first transmission and the last transmission) of the multiple UEs are aligned in time, which has the advantage that the positions of the reference signals are also aligned, so MU-MIMO can be implemented between the multiple UEs.
(II) the following gives the method of determining the transmission mode.
As can be seen from the above description, each transmission mode has its suitable scenario, and the base station can indicate to the UE what transmission mode to use for transmission.
The base station may include, in the scheduling information, a transmission mode indicated by the indication information, for example, 1bit indicates whether to use one-time transmission or M-time repeated transmission.
The base station may notify the adopted transmission modes, for example, 3 bits, through indication information in a Radio Resource Control (RRC) signaling, and respectively indicate one of the seven transmission modes.
The base station may perform joint indication by using the indication information in the RRC signaling and the scheduling information, for example, the transmission modes that the RRC signaling may use are mode one and mode seven, and the scheduling information specifically indicates whether mode one or mode seven is used.
The UE may determine the transmission mode in a preset mode, which is described in detail below:
the method comprises the following steps: and determining a transmission mode according to the value of the K.
When K is 1, data is transmitted once over K × L consecutive symbols starting from the start symbol, otherwise, data is repeatedly transmitted M times in sequence. The mode of transmitting data once is suitable for the case of large TBS, and the mode of repeatedly transmitting data M times is suitable for the case of small TBS.
And when K is equal to 1, adopting one transmission mode of the two modes in the (I) for transmission, otherwise, adopting one transmission mode of the three, four, five, six and seven modes for transmission.
And when K is 1, adopting one of the two or five transmission modes in the (one) to transmit, otherwise, adopting one of the three, four, six and seven transmission modes in the (one) to transmit.
The second method comprises the following steps: and determining the transmission type according to the values of the L and the S.
And when 14S is less than or equal to alpha.L, adopting the transmission mode of the mode one in the (one) to carry out transmission, and otherwise, adopting the mode of repeating the transmission for M times in sequence.
And when the 14-S is less than or equal to alpha.L, adopting one transmission mode in the second mode in the first mode for transmission, and otherwise, adopting one transmission mode in the third, fourth, fifth, sixth and seventh modes for transmission.
And when the 14-S is less than or equal to alpha.L, adopting one of the second and fifth transmission modes in the first mode for transmission, and otherwise, adopting one of the third, fourth, sixth and seventh transmission modes for transmission. Wherein, alpha is less than or equal to 1 and is a preset value or a value notified by the base station. Such as α being 0.5, or 0.8.
And when the 14-S is less than or equal to the alpha.L, adopting one of the three, four, five and six transmission modes in the first mode for transmission, and otherwise, adopting one of the two transmission modes for transmission. Wherein, alpha is less than or equal to 1 and is a preset value or a value notified by the base station. Such as α being 0.5, or 0.8.
And (III) a method for determining the modulation order in transmission in the transmission method.
As can be seen from (one), in some cases, the transmission time of each transmission in the M repeated transmissions is different, for example, 4 transmissions are transmitted in fig. 2, and the transmission times are 4, 2, and 4 symbols, respectively. Then, for transmission with a shorter transmission time (for example, 2 symbols), the number of REs that can be transmitted is reduced, and the number of bits that can be transmitted is also reduced accordingly, under the condition that the TBS is not changed, the performance is seriously affected by too large code rate, and even the code rate may exceed 0.95, which results in that decoding cannot be performed. The invention therefore proposes to avoid this by increasing the modulation order.
Let a first transmission be a transmission with the largest number of transmission symbols among M consecutive repeated transmissions, and a second transmission be a transmission other than the first transmission among the M consecutive repeated transmissions. For example, the transmission times of 4 consecutive transmissions are 4, 2, 4, and 4, respectively, then the first, third, and fourth transmissions are the first transmission, and the second transmission is the second transmission. Qm0Modulation order, Q, corresponding to the first transmissionm1For the modulation order corresponding to the second transmission, then:
Qm1≥Qm0
for example, as shown in fig. 1, three transmissions are performed, the longest transmission time is the second transmission, and it is assumed that the modulation order corresponding to the second transmission is 2 and the modulation order corresponding to the first transmission is 4.
Qm0Is indicated in the scheduling information received by the transmitting device.
Qm1The determination of (c) includes one of:
(1)Qm1from Qm0、L1And L0At least one of. Wherein L is0Number of transmission symbols, L, corresponding to the first transmission1The number of transmission symbols corresponding to the second transmission. Several ways of determination are given below:
Qm1＝min(Qm0+2，C1)；
Figure BDA0002105140530000181
Figure BDA0002105140530000182
wherein, C1Has a value of 8 or 6, C2Has a value of 4 or 8.
Figure BDA0002105140530000183
Which means that the rounding is made up,
Figure BDA0002105140530000184
indicating a rounding down. Wherein N isDMRS0Number of symbols occupied by demodulation reference signals corresponding to the first transmission, NDMRS0Is a non-negative integer, and NDMRS0＜L0. E.g. in the first transmission, there is one symbol for transmitting the demodulation reference signal, then NDMRS0＝1。NDMRS1Number of symbols occupied by demodulation reference signals corresponding to said second transmission, NDMRS1Is a non-negative integer, and NDMRS1＜L1. The calculation of deducting the symbols used for the demodulation reference signal is more effective for the uplink adopting the SC-FDMA mode, because the demodulation reference signal in the SC-FDMA mode is exclusive of one symbol.
For example, as in the scenario of fig. 2, there are 4 transmissions, the number of transmitted symbols is 4, 2, and 4, and assuming that the modulation order corresponding to the first and last transmissions is 4, then a formula is adopted
Figure BDA0002105140530000191
Substituting L as 4, L1For example, assuming that the demodulation reference signal exclusively occupies one symbol, the formula is adopted
Figure BDA0002105140530000192
Substituting L as 4, L1＝2，NDMRS0＝NDMRS1-1, the available modulation order for the second and third transmissions is 6.
(2)Qm1The base station is notified by the scheduling information or RRC signaling in (one). Q is included in the scheduling informationm0And Qm1Relative Qm0Offset information of (2), e.g. Q in scheduling informationm0And with 1bit indicating offset, "0" indicates Qm1＝Qm0+2, "1" denotes Qm1＝Qm0+4。
By the mode, the guaranteed code rate of the UE is not reduced. In addition, the transmission power of the UE is related to the modulation order, and in the method, the modulation order is increased, and then the transmission power of the UE is also increased correspondingly. In this way, link performance is guaranteed.
In the above method, the modulation order in the transmission with shorter transmission time is increased, so the number of bits that can be transmitted is correspondingly increased, and the code rate is reduced under the condition that the TBS is not changed. The method can avoid the phenomenon that the error rate is greatly increased and even cannot be decoded when the code rate exceeds the threshold value in the transmission with short transmission time and the code rate is too large.
And (IV) a method for determining the number of transmission layers and the precoding matrix in the transmission method.
Aiming at the problem that the code rate is too high and the decoding cannot be carried out, the number of bits which can be transmitted is increased by a method of increasing the number of transmission layers.
The definition of the first transmission and the second transmission in (iii) is still used here.
(1) The method for determining the number of transmission layers specifically comprises the following steps:
R0number of layers, R, corresponding to the first transmission1For the number of layers corresponding to the second transmission, then:
R1≥R0
R0is indicated in the scheduling information received by the transmitting device.
1)R1From R0、L0And L1At least one of. Several ways of determination are given below.
R1＝min(R0+1，C2)；
Figure BDA0002105140530000201
Figure BDA0002105140530000202
R1＝min(R0+x，C2) Wherein
Figure BDA0002105140530000203
R1＝min(R0+x，C2) Wherein
Figure BDA0002105140530000204
wherein, C2The value of (c) is the maximum number of layers that the UE can transmit, typically 4 or 8,
Figure BDA0002105140530000205
which means that the rounding is made up,
Figure BDA0002105140530000206
indicating a rounding down.
2)R1The base station is informed by scheduling information or RRC signaling received by the transmission equipment, and the scheduling information contains R0And R1Relative to R0For example, an indication contained in the scheduling information, and 1bit indicates an offset, and "0" indicates R1＝R0+1, "1" denotes R1＝R0+2。
(2) The method for determining the precoding matrix specifically comprises the following steps:
after the UE obtains the information of the number of transmission layers, it needs to know the precoding matrix corresponding to the number of transmission layers to perform transmission. The following provides a method for the UE to know the precoding matrix. Assume that the precoding matrix corresponding to the first transmission is W0The precoding matrix corresponding to the second transmission is W1。
The base station includes W in the scheduling information received by the transmission device0UE obtains W by receiving scheduling information0UE determines W1The method of (1) is one of the following:
1) UE is according to W0Determining W1。
W1For the number of transmission layers to be R1Front R in corresponding precoding matrix set0Column is W0The precoding matrix of (2). For example, R0＝1，
Figure BDA0002105140530000211
R1The precoding matrix set corresponding to 2 is as shown in table 1 below. The TPMI is an index of the precoding matrix, and the matrix in the table is the precoding matrix.
Table 1 precoding matrix set when the number of transmission layers is 2
Figure BDA0002105140530000221
Satisfies that the first column is W0Is a precoding matrix of
Figure BDA0002105140530000222
Or
Figure BDA0002105140530000223
Then W1Is equal to one of the two precoding matrices. The UE may select any one, or select one according to a preset rule, such as selecting the one with smaller index, i.e. selecting the one with smaller index
Figure BDA0002105140530000224
2))W1The UE uses the preset precoding matrix in the second transmission, or uses the precoding matrix notified in the RRC signaling.
3) The base station informs a plurality of precoding matrixes corresponding to different transmission layer numbers in RRC signaling, and the UE transmits the corresponding transmission layer number R according to the second transmission1And selecting the corresponding precoding matrix for transmission.
By the mode, the guaranteed code rate of the UE is not reduced. In addition, the transmission power of the UE is related to the number of transmission layers, and in the method, the number of transmission layers is increased, and the transmission power of the UE is also increased accordingly. In this way, link performance is guaranteed.
In the above method, the number of transmission layers in transmission with a short transmission time is increased, so the number of bits that can be transmitted is correspondingly increased, and the code rate is reduced under the condition that the TBS is not changed. The method can avoid the phenomenon that the error rate is greatly increased and even cannot be decoded when the code rate exceeds the threshold value in the transmission with short transmission time and the code rate is too large.
The UE may simultaneously employ methods of increasing the modulation order and increasing the number of transmission layers.
1) When in use
Figure BDA0002105140530000231
When is, Qm1＝Qm0+2，R1＝R0(ii) a Otherwise, Qm1＝Qm0+2，R1＝R0+1。
2) When in use
Figure BDA0002105140530000232
When R1 is R0+1, Qm1＝Qm0(ii) a Otherwise, R1＝R0+1，Qm1＝Qm0+2。
And (V) a method for determining a Transport Block Size (TBS) to be transmitted in the transmission method.
In the method proposed by the present invention, since there are multiple retransmissions and the transmission times corresponding to the multiple retransmissions are not necessarily the same, the method for determining the TBS in the existing standard cannot be reused, and a method for determining the TBS needs to be provided.
The transmission device generates the number of REs from a predetermined number of symbols X, and generates TBS for transmission data from the number of REs, wherein the predetermined number of symbols X is one of:
L：
min(Ti)，i＝1，2，…，M；
max(Ti)，i＝1，2，…，M；
Figure BDA0002105140530000241
Figure BDA0002105140530000242
K·L：
wherein, TiThe number of symbols corresponding to the ith transmission in the M consecutive repeated transmissions,
Figure BDA0002105140530000243
which means that the rounding is made up,
Figure BDA0002105140530000244
indicating a rounding down.
In the 5G NR standard, TBS is determined in several steps, where one step requires the calculation of the number of REs transmitted, and the calculation formula is:
NRE＝min(156，N′RE)·nPRB
wherein
Figure BDA0002105140530000245
Here, X can be substituted into one of the several parameters mentioned above, such as
Figure BDA0002105140530000246
Wherein,
Figure BDA0002105140530000247
is notified by the scheduling information and,
Figure BDA0002105140530000248
is RRC signaled. Taking the scenario of fig. 2 as an example, the symbol numbers of 4 transmissions are 4, 2, and 4, respectively, and then
Figure BDA0002105140530000249
Substituting X-3 into N'REIn the formula (2), further obtain NREAnd further TBS is obtained.
In M consecutive repeated transmissions, the redundancy version used for the second transmission is 0 or 3.

Claims (8)

1. A method for transmitting a data channel, the method comprising:
firstly, a transmission device receives scheduling information or the transmission device receives the scheduling information and radio resource control RRC signaling, and determines the following information:
an index S of the starting transmission symbol;
the number of time intervals K;
the number of symbols L contained in each time interval;
a transmission mode;
modulation order in the transmission;
the number of transmission layers;
a precoding matrix;
TBS of the transmission data;
then, transmitting data in the transmission mode on continuous K x L symbols starting from the initial transmission symbol;
wherein the transmission mode is one-time transmission or continuous M-time repeated transmission, S is more than or equal to 0 and less than or equal to 13, M is more than or equal to 2, K is more than or equal to 1, and L is more than or equal to 1 and less than or equal to 14;
the value of L is one of the following values:
l belongs to the set {2,3,4,7 };
l is an even number;
l is a power of 2;
when the transmission mode is continuous M times of repeated transmission, the transmission mode comprises one of the following modes:
the method a: transmitting data once on all symbols within each of the slots and belonging to the K x L symbols when the K x L symbols span multiple slots;
mode c: when all symbols in a time interval are in a time slot, transmitting data once in the time interval, when the time interval spans two time slots, transmitting data once in symbols corresponding to part of the time interval in the previous time slot, and transmitting data once in symbols corresponding to the rest of the time interval in the next time slot;
mode d: transmitting data once in a first time interval, and for K-1 time intervals later, transmitting data once in the time interval when all symbols in the time interval are in one time slot, transmitting data once in symbols corresponding to part of the time interval in a front time slot and transmitting data another time in symbols corresponding to the rest time intervals in a rear time slot when the time interval spans two time slots;
mode e: when said K x L symbols span a plurality of slots, for all symbols within each of said slots and belonging to said K x L symbols, transmitting data once every L symbols, starting with the first symbol, and if there are remaining symbols within said slot, less than L in number, then transmitting data once again on said remaining symbols;
mode f: transmitting data once at each preset interval in the K x L symbols, and transmitting data once at the truncated preset interval when a start symbol or an end symbol of data transmission does not coincide with the start symbol or the end symbol of the preset interval;
wherein the time interval is a period of time that sequentially divides K x L symbols into K symbols of duration L symbols.
2. The method according to claim 1, wherein in the mode f, the preset interval includes one of the following:
(1) the preset interval is that every L symbols in each time slot are divided into a preset interval from a first symbol, and if the time slot has the remaining symbols with the number less than L, the remaining symbols form a preset interval;
(2) the preset interval is that each subframe is divided into a preset interval from a first symbol, every L symbols, and if the subframe has the remaining symbols with the number less than L, the remaining symbols form a preset interval;
(3) the preset interval is that each wireless frame is divided into a preset interval from a first symbol, every L symbols, and if the wireless frame has the symbols with the number less than L, the rest symbols form a preset interval.
3. The method of claim 1, wherein the determining of the transmission mode comprises one of:
(1) the transmission equipment determines the transmission mode according to at least one value of the K, S and the L;
(2) the transmission equipment determines a transmission mode according to at least one of indication information contained in the scheduling information and indication information in RRC signaling, wherein the RRC signaling contains a set of transmission modes, and the set comprises a mode a, a mode c, a mode d, a mode e and a mode f when the transmission modes are transmitted for one time and M times of repeated transmission; the indication information contained in the scheduling information and the indication information in the RRC signaling indicate one transmission mode in the set.
4. The transmission method of the data channel according to claim 3, wherein when the transmission device determines the transmission mode according to at least one of the values K, S and L, the following is specifically performed:
(1) when determining the transmission mode according to the value of K, the transmission mode comprises one of the following modes:
when K is 1, the transmission mode is to transmit data once, otherwise, the transmission mode is to repeatedly transmit data M times in sequence;
when K is 1, the transmission mode is the mode a, otherwise, the transmission mode is one of the modes c, d, e and f;
when K is 1, the transmission mode is the mode a or d, otherwise, the transmission mode is one of the modes c, e and f;
(2) when determining the transmission mode according to the values of L and S, the transmission mode comprises one of the following modes:
when the 14-S is less than or equal to alpha.L, the transmission mode is to transmit data once, otherwise, the transmission mode is to repeatedly transmit data for M times in sequence;
when 14-S is less than or equal to alpha.L, the transmission mode is the mode a, otherwise, the transmission mode is one of the modes c, d, e and f;
when 14-S is less than or equal to alpha.L, the transmission mode is the mode a or d, otherwise, the transmission mode is one of the modes c, e and f;
when 14-S is less than or equal to alpha.L, the transmission mode is one of the modes c, d and e, otherwise, the transmission mode is the mode a;
wherein alpha is a positive number and is less than or equal to 1.
5. The transmission method according to claim 1, wherein the first transmission is a transmission having a maximum number of transmission symbols among M consecutive repeated transmissions, and the second transmission is a transmission other than the first transmission among the M consecutive repeated transmissions;
when the transmission mode is continuous M times of repeated transmission, the method for determining the modulation order is as follows:
let Qm0Modulation order, Q, corresponding to the first transmissionm1For the modulation order corresponding to the second transmission, then: qm1≥Qm0(ii) a And Qm0Is indicated in the scheduling information, Qm1The determination of (c) includes one of:
(1)Qm1from Qm0、L1And L0Wherein L is0Number of transmission symbols, L, corresponding to the first transmission1The specific determination for the number of transmission symbols corresponding to the second transmission may include one of:
Qm1＝min(Qm0+2，C1)；
Figure FDA0002629835930000051
Figure FDA0002629835930000052
wherein, C1Has a value of 8 or 6, C2Has a value of 4 or 8;
Figure FDA0002629835930000053
which means that the rounding is made up,
Figure FDA0002629835930000054
represents rounding down; n is a radical ofDMRS0Number of symbols occupied by demodulation reference signals corresponding to the first transmission, NDMRS0Is a non-negative integer, and NDMRS0＜L0；NDMRS1Number of symbols occupied by demodulation reference signals corresponding to the second transmission, NDMRS1Is a non-negative integer, and NDMRS1＜L1；
(2)Qm1The base station notifies the scheduling information or RRC signaling, and the scheduling information contains Qm0And Qm1Relative Qm0The offset information of (1).
6. The method according to claim 5, wherein when the transmission mode is M times of continuous repeated transmission, the method for determining the number of transmission layers and the precoding matrix is as follows:
(1) the method for determining the number of transmission layers specifically comprises the following steps:
let R0For the first transmissionCorresponding number of layers, R1For the number of layers corresponding to the second transmission, then: r1≥R0(ii) a And R is0Is indicated in the scheduling information, R1The determination of (c) includes one of:
1)R1from R0、L0And L1The specific determination mode comprises one of the following steps:
R1＝min(R0+1，C2)；
Figure FDA0002629835930000061
Figure FDA0002629835930000062
R1＝min(R0+x，C2) Wherein
Figure FDA0002629835930000063
R1＝min(R0+x，C2) Wherein
Figure FDA0002629835930000064
wherein, C2The value of (a) is the maximum number of layers that the transmission device can send, and is 4 or 8;
Figure FDA0002629835930000065
which means that the rounding is made up,
Figure FDA0002629835930000066
represents rounding down;
2)R1the base station notifies the scheduling information or RRC signaling, and the scheduling information contains R0And R1Relative to R0Offset information of (2);
(2) the method for determining the precoding matrix specifically comprises the following steps:
let W0Precoding matrix corresponding to the first transmission, W1A precoding matrix corresponding to the second transmission; the base station includes W in the scheduling information0The transmission apparatus obtains W by receiving the scheduling information0The transmission device determines W1The method of (1) is one of the following:
1) the transmission device is according to W0Determining W1，W1For the number of transmission layers to be R1Front R in corresponding precoding matrix set0Column is W0The precoding matrix of (a);
2)W1is a preset precoding matrix;
3) the base station informs a plurality of precoding matrixes corresponding to different transmission layer numbers in RRC signaling, and the transmission equipment is used for transmitting the precoding matrixes according to the R1And selecting the corresponding precoding matrix.
7. The method of claim 6, wherein when the transmission mode is M repeated transmissions, the method for determining the TBS of the transmitted data comprises:
the transmission equipment generates RE number according to the designated symbol number X, and then generates TBS of transmission data according to the RE number, wherein the designated symbol number X is one of the following:
L；
min(Ti)，i＝1，2，…，M；
max(Ti)，i＝1，2，…，M；
Figure FDA0002629835930000071
Figure FDA0002629835930000072
K·L；
wherein, TiThe number of symbols corresponding to the ith transmission in the M continuous repeated transmissions，
Figure FDA0002629835930000073
Which means that the rounding is made up,
Figure FDA0002629835930000074
represents rounding down;
the calculation formula of the RE number is as follows:
NRE＝min(156，N′RE)·nPRB
wherein,
Figure FDA0002629835930000081
Figure FDA0002629835930000082
is notified by the scheduling information and,
Figure FDA0002629835930000083
is RRC signaled.
8. A transmission apparatus for a data channel, comprising:
a receiving unit, configured to receive the scheduling information by the transmission device or receive the scheduling information and the RRC signaling by the transmission device, and determine the following information: the index S of the initial transmission symbol, the time interval number K, the symbol number L contained in each time interval, the transmission mode, the modulation order in transmission, the transmission layer number, the precoding matrix and the TBS of transmission data;
a transmission unit, configured to transmit data in the transmission manner over K × L consecutive symbols from the initial transmission symbol;
wherein the transmission mode is one-time transmission or continuous M-time repeated transmission, S is more than or equal to 0 and less than or equal to 13, M is more than or equal to 2, K is more than or equal to 1, and L is more than or equal to 1 and less than or equal to 14;
the value of L is one of the following values:
l belongs to the set {2,3,4,7 };
l is an even number;
l is a power of 2;
when the transmission mode is continuous M times of repeated transmission, the transmission mode comprises one of the following modes:
the method a: transmitting data once on all symbols within each of the slots and belonging to the K x L symbols when the K x L symbols span multiple slots;
mode c: when all symbols in a time interval are in a time slot, transmitting data once in the time interval, when the time interval spans two time slots, transmitting data once in symbols corresponding to part of the time interval in the previous time slot, and transmitting data once in symbols corresponding to the rest of the time interval in the next time slot;
mode d: transmitting data once in a first time interval, and for K-1 time intervals later, transmitting data once in the time interval when all symbols in the time interval are in one time slot, transmitting data once in symbols corresponding to part of the time interval in a front time slot and transmitting data another time in symbols corresponding to the rest time intervals in a rear time slot when the time interval spans two time slots;
mode e: when said K x L symbols span a plurality of slots, for all symbols within each of said slots and belonging to said K x L symbols, transmitting data once every L symbols, starting with the first symbol, and if there are remaining symbols within said slot, less than L in number, then transmitting data once again on said remaining symbols;
mode f: transmitting data once at each preset interval in the K x L symbols, and transmitting data once at the truncated preset interval when a start symbol or an end symbol of data transmission does not coincide with the start symbol or the end symbol of the preset interval;
wherein the time interval is a period of time that sequentially divides K x L symbols into K symbols of duration L symbols.
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