CN106856613B - Downlink Control Information (DCI) sending method and related device - Google Patents

Downlink Control Information (DCI) sending method and related device Download PDF

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CN106856613B
CN106856613B CN201510908858.2A CN201510908858A CN106856613B CN 106856613 B CN106856613 B CN 106856613B CN 201510908858 A CN201510908858 A CN 201510908858A CN 106856613 B CN106856613 B CN 106856613B
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dci
time slot
downlink
continuous time
segmented
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CN106856613A (en
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姜艳平
杨浔
余西西
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1221—Wireless traffic scheduling based on age of data to be sent
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
    • 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
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The application discloses a method for sending Downlink Control Information (DCI), which comprises the following steps: the method comprises the steps of firstly obtaining the positions and time lengths of N downlink continuous time slot segments, wherein the time slots comprise special time slots, then calculating the byte length of DCI which can be transmitted by each downlink continuous time slot segment, then segmenting the DCI to be transmitted according to the position of each downlink continuous time slot segment and the byte length of the DCI which can be transmitted, and transmitting the segmented DCI according to the position of the corresponding downlink continuous time slot segment. Therefore, the segmented transmission of a large DCI is realized, the resource occupied by each segmented DCI is less, the consumed power consumption is lower, and the transmission efficiency is also improved by using the segmented transmission of the DCI. In the segmentation process, the byte length of DCI which can be transmitted by the special time slot is considered, and the utilization rate of resources is improved.

Description

Downlink Control Information (DCI) sending method and related device
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a related apparatus for sending downlink control information DCI.
Background
The application of Machine-to-Machine (Machine to Machine, abbreviated as M2M) communication based on cellular networks is receiving more and more attention, the co-site and co-frequency band of the M2M network and the existing cellular network become basic requirements for reducing the operation and maintenance cost of operators, and the M2M network needs a system with low power consumption and high transmission efficiency as support.
The third Generation Partnership Project (3 rd Generation Partnership Project (3 GPP) organization is making standard specifications (i.e., LTE-M protocol) for applications and M2M networks, and considers that M2M applications are implemented using guard band spacing of Global System for Mobile communication (GSM) or Long Term Evolution (LTE) systems, and mainly discusses LTE-M systems based on Frequency Division Duplex (FDD). However, at present, a large number of Time Division Duplex (TDD) frequency spectrums are not fully developed and used, and how to provide M2M application by using the TDD frequency spectrums is an urgent problem to be solved.
Disclosure of Invention
The application provides a method and a device for sending Downlink Control Information (DCI), which can realize segmented transmission of the DCI, thereby improving the utilization rate of resources.
In a first aspect, a method for sending downlink control information DCI is provided, including:
acquiring the time length capable of transmitting DCI in a special time slot according to the configuration of the special time slot of a channel, wherein the channel is used for transmitting DCI;
acquiring the positions of N downlink continuous time slot segments and the time length of the N downlink continuous time slot segments for transmitting DCI according to the uplink and downlink time slot matching mode of the channel, wherein the N downlink continuous time slot segments comprise the special time slot;
calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the bandwidth of the channel and the modulation coding mode according to a preset algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the preset rule enables the byte length of the DCI after each segmentation to be smaller than or equal to the byte length of the DCI which can be transmitted by the downlink continuous time slot segment at the corresponding position;
and sending the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end.
In a possible implementation manner, the DCI includes three types of information, that is, an acknowledgement character ACK, uplink scheduling indication information, and downlink scheduling indication information;
the segmenting, according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of each downlink continuous time slot segment capable of transmitting the DCI, the DCI to be transmitted according to the preset rule includes:
and segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the content information of each segmented DCI is the same type of the three types of information, so that the content information transmitted by one downlink continuous time slot segment is the same type of DCI.
Because the different types of information included in the DCI have different functions, when the DCI to be transmitted is segmented, the content information of each segmented DCI is of the same type, for example, one segmented DCI only includes downlink scheduling indication information. Therefore, after receiving different segmented DCIs, the receiving end can quickly analyze the function indication of the content of the segmented DCI, and the information interaction efficiency of the transmitting end and the receiving end is improved.
In another possible implementation manner, a corresponding transmission period is further set in each segmented DCI, and the transmission period is used to indicate that the corresponding segmented DCI is transmitted according to the transmission period.
In practical situations, some types of information in the DCI may not be frequently used, for example, when the base station interacts with the terminal, the terminal may not need to transmit uplink data for a long time, and therefore the base station does not need to perform uplink scheduling instruction for the terminal. In order to reduce the waste of channel resources, in one possible implementation, a corresponding transmission period is also set in each segmented DCI. In this way, for the type information with less usage, the same period indication is set for all the segmented DCIs, for example, the content information of the DCI sets the same transmission period for all the segmented DCIs with the uplink scheduling indication, and the transmission period of the segmented DCIs is 2 times of the transmission period for transmitting other types of segmented DCIs, so when the base station transmits the ACK information and the downlink scheduling indication information to the terminal twice, the base station transmits the uplink scheduling indication information to the terminal once, thereby reducing the waste of channel resources and improving the utilization rate of the channel resources.
In a second aspect, a device for transmitting downlink control information DCI is provided, where the device for transmitting DCI has a function of implementing the method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In one possible implementation manner, a DCI transmission apparatus provided in the present application includes:
a first obtaining unit, configured to obtain, according to a configuration of a special time slot of a channel, a time length in the special time slot, where the special time slot is capable of transmitting DCI, where the channel is used for transmitting DCI;
a second obtaining unit, configured to obtain, according to an uplink and downlink timeslot matching manner of the channel, positions of N downlink continuous timeslot segments and a time length for which the N downlink continuous timeslot segments can transmit DCI, where the N downlink continuous timeslot segments include the special timeslot;
a calculating unit, configured to calculate, according to the bandwidth of the channel and the modulation and coding scheme, a byte length that each downlink continuous time slot segment in the N downlink continuous time slot segments can transmit DCI according to a predetermined algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
a segmenting unit, configured to segment the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of each downlink continuous time slot segment capable of transmitting the DCI, where the preset rule enables the byte length of each segmented DCI to be smaller than or equal to the byte length of the downlink continuous time slot segment at the corresponding position capable of transmitting the DCI;
and the sending unit is used for sending the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end.
In another possible implementation, the apparatus for transmitting DCI includes: the device comprises a memory, a processor and a transmitter, wherein the memory, the processor and the transmitter are connected with each other through a bus, computer instructions are stored in the memory, and the processor executes the computer instructions, so that the following steps are realized:
acquiring the time length capable of transmitting DCI in a special time slot according to the configuration of the special time slot of a channel, wherein the channel is used for transmitting DCI;
acquiring the positions of N downlink continuous time slot segments and the time length of the N downlink continuous time slot segments for transmitting DCI according to the uplink and downlink time slot matching mode of the channel, wherein the N downlink continuous time slot segments comprise the special time slot;
calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the bandwidth of the channel and the modulation coding mode according to a preset algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the preset rule enables the byte length of the DCI after each segmentation to be smaller than or equal to the byte length of the DCI which can be transmitted by the downlink continuous time slot segment at the corresponding position;
and controlling the transmitter to transmit the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end.
The method for sending the DCI provided by the application comprises the following steps: acquiring the time length capable of transmitting DCI in a special time slot according to the configuration of the special time slot of a channel, wherein the channel is used for transmitting DCI; acquiring the positions of N downlink continuous time slot segments and the time length of the N downlink continuous time slot segments for transmitting DCI according to the uplink and downlink time slot matching mode of the channel, wherein the N downlink continuous time slot segments comprise the special time slot; because each special time slot has a part capable of being used for downlink transmission, in order to avoid resource waste of the downlink transmission part in the special time slot and improve the utilization rate of the whole time slot resource, the obtained N downlink continuous time slot segments contain the special time slots so as to use the special time slots when the DCI is segmented subsequently. Calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the bandwidth of the channel and the modulation coding mode according to a preset algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted; segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the preset rule enables the byte length of the DCI after each segmentation to be smaller than or equal to the byte length of the DCI which can be transmitted by the downlink continuous time slot segment at the corresponding position; and sending the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end. The DCI to be transmitted is segmented according to the preset rule, so that the downlink time slot segment at the corresponding position of each segmented DCI can transmit the corresponding segmented DCI, and thus, the segmented transmission of the whole DCI to be transmitted is realized, and the channel resources occupied by each segmented DCI are necessarily less than the channel resources occupied by the whole DCI to be transmitted, so that the power consumption for transmitting one segmented DCI is lower, and the load of a system is reduced. In network transmission, due to factors such as system load and power consumption, it takes a lot of time to transmit a large packet, and if the packet is transmitted in segments, the transmission efficiency can be improved, because the sum of the time taken to transmit all the segmented packets is generally less than the time taken to transmit the entire packet at one time. Therefore, in the DCI sending method provided by the present application, the DCI is transmitted in segments, so that the transmission efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of 7 uplink and downlink timeslot matching modes of a channel in a TDD LTE system;
fig. 2 is a schematic diagram of a method for transmitting downlink control information DCI according to the present application;
fig. 3 is a schematic diagram of two consecutive 10ms timeslot segments with an uplink timeslot ratio of 5:5 provided by the present application;
fig. 4 is a schematic diagram of another sending method of downlink control information DCI provided in the present application;
fig. 5 is a schematic diagram of a frame format of a segmented DCI provided herein;
fig. 6 is a schematic diagram of another frame format of a segmented DCI provided herein;
fig. 7 is a schematic diagram of a device for transmitting downlink control information DCI according to the present application;
fig. 8 is a schematic diagram of an apparatus for scheduling a packet according to the present application.
Detailed Description
The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the embodiments described in the present application are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Although the LTE System is described as an example in the background section, it should be understood by those skilled in the art that the present invention is not limited to the LTE System, but may also be applied to other wireless Communication systems, such as Global System for Mobile communications (GSM), Mobile Communication systems (UMTS), Code Division Multiple Access (CDMA) systems, and new network systems. The following takes an LTE system as an example to describe a specific embodiment.
Firstly, a TDD LTE-M system is provided, in order to realize the application of common site and common frequency spectrum, the TDD LTE-M system should not interfere the existing TDD LTE system, the TDD LTE-M system needs to ensure the matching of uplink and downlink Time slots and the distribution condition of the adjacent TDD LTE system to be consistent, thereby meeting the basic requirement of non-mutual interference, that is, when the existing TDD LTE system base station is currently transmitting downlink data, at this time, the TDD LTE-M base station must only transmit downlink data, therefore, the uplink and downlink timeslot matching mode of the TDD LTE-M system needs to be consistent with the uplink and downlink timeslot matching mode of the TDD LTE system. As shown in fig. 1, the existing TDD LTE system supports 7 channel uplink and downlink timeslot matching modes in total, where 4 uplink and downlink switching periods are 5ms, and 3 uplink and downlink switching periods are 10ms, where a 5ms uplink and downlink switching period in the figure specifically means that the system is switched from downlink transmission to uplink transmission every 5 ms; the same applies to the uplink and downlink switching period of 10 ms.
DCI in the TDD LTE-M system is downlink control information sent to a terminal by a base station, mainly indicates uplink and downlink resource allocation conditions to the terminal, and sends Acknowledgement Character (ACK) information and the like. The application provides a method and a related device for transmitting DCI.
Referring to fig. 2, a method for sending downlink control information DCI provided in the present application includes the following steps:
101. acquiring the time length capable of transmitting DCI in a special time slot according to the configuration of the special time slot of a channel, wherein the channel is used for transmitting DCI;
before sending the DCI, a channel for transmitting the DCI needs to be determined, and then a time length for transmitting the DCI in a special time slot in the special time slot is obtained according to configuration of the special time slot of the channel. Fig. 1 shows 7 uplink and downlink timeslot matching modes of a channel in a TDD LTE system, where no matter which uplink and downlink timeslot matching mode is used, at least one special timeslot exists in a 10ms transmission period. One special time slot comprises three parts of a downlink pilot time slot DwPTS, a guard time slot GP and an uplink pilot time slot UpPTS, wherein the DwPTS part is the downlink time slot and can be used for transmitting DCI. In the TDD LTE system, there are 9 configurations of Normal cyclic prefixes (Normal cyclic prefixes) and 7 configurations of Extended cyclic prefixes (Extended cyclic prefixes) in a special timeslot, and the time lengths of three partial timeslots in the special timeslot are different, as shown in table 1.
TABLE 1
Figure BDA0000872615960000071
The three parts of the special time slot in each configuration in Table 1 are 30720Ts and 30720 togetherTS1 ms. As shown in table 1, in the special timeslot with the configuration of 9 Normal cyclic prefixes (Normal cyclic prefixes) and the configuration of extended cyclic prefixes (extended cyclic prefixes) in 7, the time length of the general downlink pilot timeslot DwPTS occupies most of the whole special timeslot, for example, in the special timeslot configured as the Normal cyclic prefix No. 1, the time length of the DwPTS is 19760TSThe time length of each time slot is 1ms, namely 30720TSTherefore, in the special timeslot of configuration No. 1, DwPTS occupies 19760/30720-0.643 ms, which is longer than half of the entire special timeslot. Because the uplink and downlink time slot matching mode of the TDDLTE-M system is consistent with the uplink and downlink time slot matching mode of the TDD LTE system, in order to fully utilize the downlink time slot capable of transmitting DCI, in the present application, the time length capable of transmitting DCI in the special time slot needs to be obtained according to the configuration of the special time slot.
102. Acquiring the positions of N downlink continuous time slot segments and the time length of the N downlink continuous time slot segments for transmitting DCI according to the uplink and downlink time slot matching mode of the channel, wherein the N downlink continuous time slot segments comprise the special time slot;
as shown in fig. 1, in 7 uplink and downlink timeslot allocations, the time length of the longest downlink timeslot segment is less than 9ms (in an allocation scheme where the downlink-to-uplink ratio is 9:1, when two 10ms timeslot segments are combined, the time length of the longest downlink timeslot segment is 7+1+ DwPTS <9ms), and a complete DCI transmitted by the base station to the terminal generally includes uplink resource scheduling indication information, downlink resource scheduling indication information, and ACK information. A downlink timeslot with a continuous time length of less than 9ms generally cannot transmit a complete DCI, so in this application, a method for performing segmented transmission on DCI is proposed. In the segmentation method of the present application, each segment DCI needs to correspond to one downlink continuous time slot segment, and the downlink continuous time slot segment must be capable of transmitting the corresponding segment DCI, so before the DCI is segmented, the positions of N downlink continuous time slot segments and the time lengths of the N downlink continuous time slot segments capable of transmitting the DCI need to be obtained, and further, the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI are obtained. For example, if the ratio of the uplink timeslot to the downlink timeslot is 5:5, and the special timeslot is configured as a normal cyclic prefix configured as position 1, the time length of DwPTS in the special timeslot is 0.643 (see description in 101), and the first downlink continuous timeslot segment is set as position 1, then the time length that can be transmitted in the downlink continuous timeslot segment at position 1 is 1ms +0.643ms, which is 1.643 ms.
103. Calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the channel bandwidth and the modulation coding mode according to a preset algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
in a possible implementation manner, the TDD LTE-M system may use a Frequency Division duplex Long term evolution-machine to machine (Frequency Division duplex Long term evolution based M2M, abbreviated as FDDLTE-M) system downlink sub-channel Division design, that is, the total bandwidth of the TDD LTE-M is 180KHz, the total bandwidth is divided into 12 sub-channels, and the bandwidth of each sub-channel is 12KHz (since a part of guard interval may be left between sub-channels, it is not a direct 180/12 relationship); when the DCI is transmitted, one 12kHz sub-channel transmission can be fixed, and the full-bandwidth 180kHz transmission can also be fixed.
In one possible implementation, the TDD LTE-M system may use the modulation and coding scheme of the FDD LTE-M system, that is, 1/2 convolutional coding and pi/2-BPSK modulation scheme.
And calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the bandwidth of the channel and the modulation coding mode according to a preset algorithm. The predetermined algorithm specifically comprises: firstly, the transmission rate of the channel is calculated according to the bandwidth of the channel, the modulation mode and the coding mode, then the bit length of each downlink continuous time slot segment, which can transmit DCI, is obtained by multiplying the transmission rate and the time length of each downlink continuous time slot segment, and finally the bit length is converted into the byte length which can transmit DCI. For example: fig. 3 is a 20ms time slot segment, where the uplink and downlink ratio of the time slot segment is 5:5, and the time lengths of the downlink continuous time slots are sequentially: 1ms + DwPTS, 2ms + DwPTS, …, if the special timeslot is configured as configuration No. 1, the transmission bandwidth is 180kHz full bandwidth, the modulation mode is pi/2-BPSK, 1/2 convolutional coding is adopted, then the channel transmission rate is 180k × log2(2) × 1/2 is 90kbps, and for the third downlink continuous timeslot segment, that is, the byte length of DCI transmitted by 2ms + DwPTS is: 90kbps (2ms +0.643ms) is 237 bits, then 237 is divided by 8 and rounded, i.e. 237/8 is 29 bytes (8 bits are one byte).
104. Segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the preset rule enables the byte length of the DCI of each segment to be smaller than or equal to the byte length of the DCI which can be transmitted by the downlink continuous time slot segment at the corresponding position;
after the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments capable of transmitting the DCI is calculated, the DCI to be transmitted can be segmented according to a preset rule, and in order to ensure that each segmented DCI can be transmitted in the corresponding downlink continuous time slot segment, the preset rule must make the byte length of each segmented DCI smaller than or equal to the byte length of the DCI capable of being transmitted by the downlink continuous time slot segment at the corresponding position. For example, as shown in fig. 3, fig. 3 shows two consecutive 10ms timeslot segments with an uplink and downlink timeslot ratio of 5:5, if it is calculated that the length of DCI bytes that can be transmitted by the first downlink consecutive timeslot segment is 18 bytes, the first segment may be performed corresponding to the DCI to be transmitted, and according to a preset rule, the length of DCI bytes of the first segment may be 18 bytes or less than 18 bytes, …, and if it is calculated that the length of DCI bytes that can be transmitted by the mth downlink consecutive timeslot segment is 29 bytes, the mth segment may be performed corresponding to the DCI to be transmitted, and the length of DCI bytes of the mth segment may be 29 bytes or less than 29 bytes.
105. Sending the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end;
after the DCI to be transmitted is segmented, the base station needs to transmit a plurality of segmented DCIs to the receiving end, which may be a terminal. Because the DCI to be transmitted is segmented according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of each downlink continuous time slot segment capable of transmitting the DCI, the byte length of each segmented DCI may be inconsistent, each segmented DCI has a corresponding downlink continuous time slot segment, and when the segmented DCI is transmitted, in order to ensure that each segmented DCI can be transmitted, the DCI needs to be transmitted according to the position of the downlink continuous time slot segment corresponding to each segmented DCI. For example, the first segmented DCI (byte length of 18 bytes) is transmitted in the corresponding first downlink consecutive slot segment (the byte length of the DCI capable of transmission is 18 bytes), and the mth segmented DCI (byte length of 29 bytes) is transmitted in the corresponding mth downlink consecutive slot segment (the byte length of the DCI capable of transmission is 29 bytes).
In the sending method of the DCI provided by the application, the positions and the time lengths of N downlink continuous time slot segments are obtained first, wherein the N downlink continuous time slot segments include a special time slot, the byte length of the DCI which can be transmitted by each downlink continuous time slot segment is calculated, the DCI to be sent is segmented according to the position of each downlink continuous time slot segment and the byte length of the DCI which can be transmitted, and the segmented DCI is sent according to the position of the corresponding downlink continuous time slot segment. In the segmentation process, the byte length of DCI which can be transmitted by the special time slot is considered, and the utilization rate of resources is improved.
Referring to fig. 4, a method for transmitting downlink scheduling information DCI provided in the present application includes the following steps:
201. acquiring the time length capable of transmitting DCI in a special time slot according to the configuration of the special time slot of a channel, wherein the channel is used for transmitting DCI;
the details are described with reference to step 101.
202. Acquiring the positions of N downlink continuous time slot segments and the time length of the N downlink continuous time slot segments for transmitting DCI according to the uplink and downlink time slot matching mode of the channel, wherein the N downlink continuous time slot segments comprise the special time slot;
the details are described with reference to step 102.
203. Calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the bandwidth of the channel and the modulation coding mode according to a preset algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
the details are described with reference to step 103.
204. The DCI comprises three types of information, namely acknowledgement character ACK, uplink scheduling indication information and downlink scheduling indication information, and is segmented according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of each downlink continuous time slot segment capable of transmitting the DCI according to a preset rule, and the content information of each segmented DCI is the same type of the three types of information, so that the content information transmitted by one downlink continuous time slot segment is the same type of DCI; a corresponding transmission period is also set in each segmented DCI, and the transmission period is used for indicating that the corresponding segmented DCI is transmitted according to the transmission period; corresponding byte length information is also set in each segmented DCI, and the byte length information is used for indicating the byte length of the corresponding segmented DCI; a corresponding Cyclic Redundancy Check (CRC) code is arranged in each segmented DCI, and the CRC code is used for indicating the corresponding check code of the segmented DCI; alternatively, the first and second electrodes may be,
setting a Cyclic Redundancy Check (CRC) of the whole DCI to be sent in the last segmented DCI, wherein the CRC is used for indicating the check code of the whole DCI to be sent;
the DCI content comprises three types of information, namely acknowledgement character ACK, uplink scheduling indication information and downlink scheduling indication information, wherein the ACK comprises UE indication and ACK field, the UE indication is used for marking the identifier of the terminal and can be a cell radio network temporary identifier (English abbreviation: C-RNTI), the ACK field is acknowledgement information replied by the base station to the terminal, 1 indicates that an uplink packet sent by the terminal is successfully received by the base station, and 0 indicates that the uplink packet is not successfully received; the downlink scheduling indication information comprises DL number and DL allocation, wherein the DL number is the number of terminals for downlink scheduling, and the DL allocation is a channel allocated by the downlink scheduling; the uplink scheduling indication information includes UL number and UL allocation, where the UL number is the number of terminals in uplink scheduling, and the UL allocation is a channel allocated by the uplink scheduling. Because the functions of different types of information in the DCI are different, the terminal can conveniently receive and analyze the content of the received segmented DCI, and when the base station segments the DCI to be transmitted, the content information of each segmented DCI is the same type of the three types of information, so that the content information transmitted in one downlink continuous time slot segment is the same type of DCI.
Referring to fig. 5, fig. 5 is a schematic diagram of a frame format of a segmented DCI, in order to enable a terminal to correctly analyze and correctly combine the segmented DCI, each segmented DCI may be provided with byte length information of the segmented DCI, and in fig. 5, a first part of a DCI Type field in the frame format of the segmented DCI is used to indicate a Type of the segmented DCI, for example, 0 indicates ACK information, 1 indicates uplink scheduling indication information, and 2 indicates downlink scheduling indication information; a second part Length field in the frame format of the segmented DCI is used for indicating the byte Length of the segmented DCI; a third part Information field in the frame format of the segmented DCI is used for indicating specific transmission data of the segmented DCI; a fourth CRC field in the frame format of the segmented DCI is used to indicate a check code of the segmented DCI, and if the segmented DCI is the last segmented DCI in the entire DCI to be transmitted, the CRC field may also be a check code used to indicate the entire DCI to be transmitted.
In the TDD LTE-M system, DCI is transmitted periodically, and before the base station transmits the DCI, the base station needs to transmit a primary synchronization signal, a secondary synchronization signal, a frame number, and System Information Block (SIB) information to a terminal, where the SIB is marked with a period for transmitting DCI, for example, 80 ms. The SIB marks a period for transmitting the entire DCI to be transmitted, but in an actual situation, some types of information in the DCI are not frequently used, for example, when a base station and a terminal perform data interaction, the terminal may not need to transmit uplink data for a long time, and therefore the base station does not need to perform uplink scheduling indication for the terminal. In order to reduce the waste of channel resources, in a possible implementation manner, referring to fig. 6, fig. 6 is a schematic diagram of another frame format of a segmented DCI, and in order to reduce the waste of channel resources, some types of information of the DCI may not be transmitted according to the same period as other types of information, such as uplink scheduling indication information. If the content of the DCI Interval field is "1", it indicates that the period of the segmented DCI is the same as the entire DCI period to be transmitted, and if the content of the DCI Interval field is "2", it indicates that the period of the segmented DCI is 2 times the entire DCI period to be transmitted, for example, if the entire DCI period is set to be transmitted in SIB 80ms, it indicates that the period of the segmented DCI is 2 × 80ms — 160ms when the content of the DCI Interval field is "2". In another possible implementation manner, the DCI Interval field may also directly set a specific transmission period of the corresponding segmented DCI, for example, if the field content of the DCI Interval is 160ms, it indicates that the transmission period of the corresponding segmented DCI is 160 ms. In this way, for the type information with less usage, the same period indication is set for all the segmented DCIs, for example, all the segmented DCIs whose DCI content information is the uplink scheduling indication are set to "2" in the DCI Interval field, and when the base station transmits the ACK information and the downlink scheduling indication information to the terminal twice, the base station transmits the uplink scheduling indication information to the terminal once, so that the waste of channel resources is reduced, and the utilization rate of the channel resources is improved.
In order to ensure the accuracy of the DCI, the base station needs to configure Cyclic Redundancy Check (CRC) for the DCI before sending the DCI to the terminal. As shown in fig. 5 or fig. 6, the base station sets a corresponding CRC for each segmented DCI, or the base station sets a CRC of the whole DCI to be sent in the last segmented DCI.
205. Sending the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end;
the details are described with reference to step 105.
Referring to fig. 7, the present application further provides a downlink control information DCI transmitting apparatus 700 for implementing the method for transmitting downlink control information DCI shown in fig. 2 and fig. 4, where the downlink control information DCI transmitting apparatus 700 includes:
a first obtaining unit 701, configured to obtain, according to a configuration of a special time slot of a channel, a time length in the special time slot, where the time length is capable of transmitting DCI, where the channel is used for transmitting DCI;
a second obtaining unit 702, configured to obtain, according to an uplink and downlink timeslot matching manner of the channel, positions of N downlink consecutive timeslot segments and a time length for which the N downlink consecutive timeslot segments can transmit DCI, where the N downlink consecutive timeslot segments include the special timeslot;
a calculating unit 703, configured to calculate, according to the bandwidth of the channel and the modulation and coding scheme, a byte length that each downlink continuous time slot segment in the N downlink continuous time slot segments can transmit DCI according to a predetermined algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
a segmenting unit 704, configured to segment the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of each downlink continuous time slot segment capable of transmitting the DCI, where the preset rule enables the byte length of each segmented DCI to be smaller than or equal to the byte length of the downlink continuous time slot segment capable of transmitting the DCI at the corresponding position;
a sending unit 705, configured to send the segmented DCI corresponding to the positions of the N downlink consecutive time slot segments to a receiving end.
The related description may be understood by referring to the related description and effects corresponding to the embodiment of the method shown in fig. 2, and will not be described herein again.
In a possible implementation manner, the DCI includes three types of information, that is, an acknowledgement character ACK, uplink scheduling indication information, and downlink scheduling indication information;
the segmentation unit 704 is specifically configured to:
segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the content information of each segmented DCI is the same type of the three types of information, so that the content information transmitted by one downlink continuous time slot segment is the same type of DCI;
in another possible implementation manner, a corresponding transmission period is further set in each segmented DCI, and the transmission period is used to indicate that the corresponding segmented DCI is transmitted according to the transmission period;
in another possible implementation manner, corresponding byte length information is further set in each segmented DCI, and the byte length information is used to indicate the byte length of the corresponding segmented DCI;
in another possible implementation manner, a corresponding Cyclic Redundancy Check (CRC) is provided in each segmented DCI, where the CRC is used to indicate a corresponding check code of the segmented DCI; alternatively, the first and second electrodes may be,
and setting a cyclic redundancy check code (CRC) of the whole DCI to be sent in the last segmented DCI, wherein the CRC is used for indicating the check code of the whole DCI to be sent.
The related description may be understood by referring to the related description and effects corresponding to the embodiment of the method shown in fig. 4, and will not be described herein again.
Based on the sending method of the downlink control information DCI provided by the present application, the present application provides a device 800 for scheduling a packet, which is used to implement the sending method of the downlink control information DCI shown in fig. 2 and fig. 4, as shown in fig. 8, the device 800 for scheduling a packet includes a memory 801, a processor 802, and a transmitter 803, the memory 801, the processor 802, and the transmitter 803 are connected to each other through a bus 804, the memory 801 stores a computer instruction, and the processor 802 executes the computer instruction, thereby implementing the following method:
acquiring the time length capable of transmitting DCI in a special time slot according to the configuration of the special time slot of a channel, wherein the channel is used for transmitting DCI;
acquiring the positions of N downlink continuous time slot segments and the time length of the N downlink continuous time slot segments for transmitting DCI according to the uplink and downlink time slot matching mode of the channel, wherein the N downlink continuous time slot segments comprise the special time slot;
calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the bandwidth of the channel and the modulation coding mode according to a preset algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the preset rule enables the byte length of the DCI after each segmentation to be smaller than or equal to the byte length of the DCI which can be transmitted by the downlink continuous time slot segment at the corresponding position;
and controlling the transmitter to transmit the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end.
In a possible implementation manner, the DCI includes three types of information, that is, an acknowledgement character ACK, uplink scheduling indication information, and downlink scheduling indication information;
the processor 802, by executing the computer instructions, can further implement the following method:
and segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the content information of each segmented DCI is the same type of the three types of information, so that the content information transmitted by one downlink continuous time slot segment is the same type of DCI.
The related description may be understood by referring to the related description and effects corresponding to the embodiment portions of the method shown in fig. 2 and fig. 4, and will not be described in detail herein.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A method for transmitting Downlink Control Information (DCI), the method comprising:
acquiring the time length capable of transmitting DCI in a special time slot according to the configuration of the special time slot of a channel, wherein the channel is used for transmitting DCI;
acquiring the positions of N downlink continuous time slot segments and the time length of the N downlink continuous time slot segments for transmitting DCI according to the uplink and downlink time slot matching mode of the channel, wherein the N downlink continuous time slot segments comprise the special time slot;
calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the bandwidth of the channel and the modulation coding mode according to a preset algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the preset rule enables the byte length of the DCI after each segmentation to be smaller than or equal to the byte length of the DCI which can be transmitted by the downlink continuous time slot segment at the corresponding position;
and sending the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end.
2. The method of claim 1, wherein the DCI includes three types of information, namely an acknowledgement character ACK, uplink scheduling indication information, and downlink scheduling indication information;
the segmenting, according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of each downlink continuous time slot segment capable of transmitting the DCI, the DCI to be transmitted according to the preset rule includes:
and segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the content information of each segmented DCI is the same type of the three types of information, so that the content information transmitted by one downlink continuous time slot segment is the same type of DCI.
3. The method of claim 2, wherein each segmented DCI is further provided with a corresponding transmission period, and the transmission period is used to indicate that the corresponding segmented DCI is transmitted according to the transmission period.
4. The method according to any one of claims 1 to 3, wherein corresponding byte length information is further set in each segmented DCI, and the byte length information is used for indicating the byte length of the corresponding segmented DCI.
5. The method according to any one of claims 1 to 3, wherein a corresponding Cyclic Redundancy Check (CRC) code is provided in each segmented DCI, and the CRC code is used for indicating the corresponding CRC code of the segmented DCI; alternatively, the first and second electrodes may be,
and setting a cyclic redundancy check code (CRC) of the whole DCI to be sent in the last segmented DCI, wherein the CRC is used for indicating the check code of the whole DCI to be sent.
6. A device for transmitting downlink control information DCI, the device comprising:
a first obtaining unit, configured to obtain, according to a configuration of a special time slot of a channel, a time length in the special time slot, where the special time slot is capable of transmitting DCI, where the channel is used for transmitting DCI;
a second obtaining unit, configured to obtain, according to an uplink and downlink timeslot matching manner of the channel, positions of N downlink continuous timeslot segments and a time length for which the N downlink continuous timeslot segments can transmit DCI, where the N downlink continuous timeslot segments include the special timeslot;
a calculating unit, configured to calculate, according to the bandwidth of the channel and the modulation and coding scheme, a byte length that each downlink continuous time slot segment in the N downlink continuous time slot segments can transmit DCI according to a predetermined algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
a segmenting unit, configured to segment the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of each downlink continuous time slot segment capable of transmitting the DCI, where the preset rule enables the byte length of each segmented DCI to be smaller than or equal to the byte length of the downlink continuous time slot segment at the corresponding position capable of transmitting the DCI;
and the sending unit is used for sending the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end.
7. The apparatus of claim 6, wherein the DCI comprises three types of information, namely an acknowledgement character ACK, uplink scheduling indication information and downlink scheduling indication information;
the segmentation unit is specifically configured to:
and segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the content information of each segmented DCI is the same type of the three types of information, so that the content information transmitted by one downlink continuous time slot segment is the same type of DCI.
8. The apparatus of claim 7, wherein each segmented DCI is further provided with a corresponding transmission period, and the transmission period is used to indicate that the corresponding segmented DCI is transmitted according to the transmission period.
9. The apparatus according to any one of claims 6 to 8, wherein corresponding byte length information is further set in each segmented DCI, and the byte length information is used to indicate the byte length of the corresponding segmented DCI.
10. The apparatus according to any one of claims 6 to 8, wherein a corresponding Cyclic Redundancy Check (CRC) code is provided in each segmented DCI, and the CRC code is used for indicating the corresponding check code of the segmented DCI; alternatively, the first and second electrodes may be,
and setting a cyclic redundancy check code (CRC) of the whole DCI to be sent in the last segmented DCI, wherein the CRC is used for indicating the check code of the whole DCI to be sent.
11. A device for transmitting downlink control information DCI, the device comprising: the device comprises a memory, a processor and a transmitter, wherein the memory, the processor and the transmitter are connected with each other through a bus, computer instructions are stored in the memory, and the processor executes the computer instructions, so that the following method is realized:
acquiring the time length capable of transmitting DCI in a special time slot according to the configuration of the special time slot of a channel, wherein the channel is used for transmitting DCI;
acquiring the positions of N downlink continuous time slot segments and the time length of the N downlink continuous time slot segments for transmitting DCI according to the uplink and downlink time slot matching mode of the channel, wherein the N downlink continuous time slot segments comprise the special time slot;
calculating the byte length of each downlink continuous time slot segment in the N downlink continuous time slot segments, which can transmit DCI, according to the bandwidth of the channel and the modulation coding mode according to a preset algorithm; the sum of the byte lengths of the N downlink continuous time slot segments capable of transmitting the DCI is greater than or equal to the byte length of the DCI to be transmitted;
segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the preset rule enables the byte length of the DCI after each segmentation to be smaller than or equal to the byte length of the DCI which can be transmitted by the downlink continuous time slot segment at the corresponding position;
and controlling the transmitter to transmit the segmented DCI corresponding to the positions of the N downlink continuous time slot segments to a receiving end.
12. The apparatus of claim 11, wherein the DCI includes three types of information, namely an acknowledgement character ACK, uplink scheduling indication information, and downlink scheduling indication information;
the processor, by executing the computer instructions, can further implement:
and segmenting the DCI to be transmitted according to a preset rule according to the position of each downlink continuous time slot segment in the N downlink continuous time slot segments and the byte length of the DCI which can be transmitted by each downlink continuous time slot segment, wherein the content information of each segmented DCI is the same type of the three types of information, so that the content information transmitted by one downlink continuous time slot segment is the same type of DCI.
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