CN114070510B - Information transmission method, device, terminal, base station and storage medium - Google Patents
Information transmission method, device, terminal, base station and storage medium Download PDFInfo
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- CN114070510B CN114070510B CN202010777757.7A CN202010777757A CN114070510B CN 114070510 B CN114070510 B CN 114070510B CN 202010777757 A CN202010777757 A CN 202010777757A CN 114070510 B CN114070510 B CN 114070510B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- 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
- H04W28/04—Error control
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Abstract
The embodiment of the application provides an information transmission method, an information transmission device, a terminal, a base station and a storage medium, wherein the method comprises the following steps: receiving PDCCH repeated transmission indication information according to the number of times of the PDCCH repeated transmission of the default physical downlink control channel; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality; and receiving the PDCCH information according to the PDCCH repeated transmission indication information. According to the information transmission method, the information transmission device, the terminal, the base station and the storage medium, the base station sends the PDCCH repeated transmission indication information to the terminal according to the current channel quality, and the terminal receives the PDCCH information according to the PDCCH repeated transmission indication information, so that the PDCCH repeated transmission times can be adaptively adjusted, and the demodulation performance of the PDCCH is improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to an information transmission method, an information transmission apparatus, a terminal, a base station, and a storage medium.
Background
The R17 standard newly introduces Reduced capability NR devices (abbreviated as "Redcap UE"), which are UEs tailored in capability or complexity based on 5G universal terminal UE.
The 5G base station (gNB) provides scheduling information of a Physical Downlink Shared Channel (PDSCH) of the UE through a Physical Downlink Control Channel (PDCCH). The 5G base station dispatches a PDSCH to the UE through the PDCCH, and the UE feeds back HARQ-ACK information according to whether the PDSCH decodes correctly.
Since the demodulation performance of the PDCCH may be degraded due to the reduction of the number of Redcap UE antennas, the demodulation performance of the PDCCH needs to be enhanced. The conventional approach is to use a larger Aggregation Level (AL).
However, the RedCap is limited by the bandwidth size, the AL is also limited, and the demodulation performance of the PDCCH cannot be improved, so how to improve the demodulation performance of the PDCCH for RedCap UEs is a technical problem to be solved.
Disclosure of Invention
The embodiment of the application provides an information transmission method, an information transmission device, a terminal, a base station and a storage medium, which are used for solving the technical problem that the demodulation performance of a PDCCH of a Redcap UE is reduced in the prior art.
In a first aspect, an embodiment of the present application provides an information transmission method, including:
receiving PDCCH repeated transmission indication information according to the number of times of the PDCCH repeated transmission of the default physical downlink control channel; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality;
and receiving PDCCH information according to the PDCCH repeated transmission indication information.
Optionally, according to the information transmission method in an embodiment of the present application, the PDCCH repeated transmission indication information is carried through PDCCH, MAC CE, or RRC signaling.
Optionally, according to the information transmission method in an embodiment of the present application, the PDCCH repeated transmission indication information is carried by downlink control information DCI.
Optionally, according to an information transmission method of an embodiment of the present application, the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
and after delaying the preset time T, receiving the PDCCH information according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
Optionally, according to the information transmission method in an embodiment of the present application, when a physical uplink control channel PUCCH carrying the ACK information is not configured with a repeat transmission mechanism, the start time of T is a last OFDM symbol of a slot in which the ACK information is located, or a first OFDM symbol of the slot in which the ACK information is located, or a last OFDM symbol of OFDM symbols occupied by the ACK information, or a first OFDM symbol of the OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
Optionally, according to the information transmission method of an embodiment of the present application, after delaying the preset time T, receiving the PDCCH information according to the number of PDCCH retransmission times indicated by the PDCCH retransmission indication information specifically includes:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and receiving PDCCH information for a group according to the m PDCCH MOs.
Optionally, according to an information transmission method of an embodiment of the present application, the receiving PDCCH information for a group of m PDCCH MOs specifically includes:
receiving PDCCH information by using PDCCH MOs in a group of PDCCH MOs one by one;
and if the PDCCH information is successfully demodulated by using the current kth PDCCH MO, the PDCCH information is not received by using the rest PDCCH MOs in the group, wherein k is less than m.
Optionally, according to an information transmission method of an embodiment of the present application, the PDCCH repeated transmission indication information includes a PDCCH repeated transmission number and a new data indicator NDI;
the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving an NDI which is not overturned and sent by a base station; the non-flipped NDI is sent by the base station after receiving non-acknowledgement NACK information;
receiving PDCCH information according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
Optionally, according to an information transmission method of an embodiment of the present application, the PDCCH repeated transmission indication information includes a PDCCH repeated transmission number and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving the turned NDI sent by the base station; the inverted NDI is sent by the base station after receiving the acknowledgement ACK message;
and receiving the PDCCH information according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
Optionally, according to an information transmission method of an embodiment of the present application, the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
receiving PDCCH information according to the PDCCH repeated transmission indication information;
counting the times of unsuccessfully receiving PDCCH information;
and if the number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold value, initiating random access to the base station, wherein the preset threshold value is configured through high-level signaling or is a preset constant.
Optionally, according to the information transmission method in an embodiment of the present application, after initiating the random access to the base station, the method further includes:
and receiving PDCCH information according to the default PDCCH repeated transmission times.
Optionally, according to the information transmission method in an embodiment of the present application, the default number of times of PDCCH retransmission is sent to the terminal by the base station in advance through broadcast signaling.
In a second aspect, an embodiment of the present application further provides an information transmission method, including:
determining the repeated transmission indication information of a Physical Downlink Control Channel (PDCCH) according to the current channel quality;
and sending the PDCCH repeated transmission indication information to the terminal according to the default PDCCH repeated transmission times so that the terminal can receive the PDCCH information according to the PDCCH repeated transmission indication information.
Optionally, according to the information transmission method in an embodiment of the present application, the PDCCH repeated transmission indication information is carried through a PDCCH, a medium access control element, MAC CE, or a radio resource control, RRC, signaling.
Optionally, according to the information transmission method in an embodiment of the present application, the PDCCH repeated transmission indication information is carried by downlink control information DCI.
Optionally, according to the information transmission method in an embodiment of the present application, after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by the terminal; the ACK information is fed back by the terminal after the physical downlink shared channel PDSCH scheduled by the PDCCH is successfully demodulated;
and after delaying the preset time T, sending the PDCCH information to the terminal according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
Optionally, according to the information transmission method in an embodiment of the present application, when a physical uplink control channel PUCCH carrying the ACK information is not configured with a repeat transmission mechanism, the start time of T is a last OFDM symbol of a slot in which the ACK information is located, or a first OFDM symbol of the slot in which the ACK information is located, or a last OFDM symbol of OFDM symbols occupied by the ACK information, or a first OFDM symbol of the OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
Optionally, according to the information transmission method of an embodiment of the present application, after delaying the preset time T, sending PDCCH information to the terminal according to the PDCCH retransmission times indicated by the PDCCH retransmission indication information, specifically including:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and sending the PDCCH information to the terminal according to the m PDCCH MOs as a group.
Optionally, according to an information transmission method of an embodiment of the present application, the PDCCH repeated transmission indication information includes a PDCCH repeated transmission number and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving non-acknowledgement (NACK) information fed back by a terminal;
the NDI which is not overturned is sent to the terminal, and the PDCCH information is sent to the terminal according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
Optionally, according to an information transmission method of an embodiment of the present application, the PDCCH repeated transmission indication information includes a PDCCH repeated transmission number and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by a terminal;
and sending the PDCCH information to the terminal according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
Optionally, according to the information transmission method in an embodiment of the present application, after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving a random access request sent by a terminal; the random access request is sent by the terminal when the counted number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold, wherein the preset threshold is configured through a high-level signaling or is a preset constant.
Optionally, according to the information transmission method in an embodiment of the present application, after receiving the random access request sent by the terminal, the method further includes:
and sending PDCCH information to the terminal according to the default PDCCH repeated transmission times.
Optionally, according to the information transmission method of an embodiment of the present application, before sending the PDCCH retransmission indication information to the terminal according to the default PDCCH retransmission times, the method further includes:
and sending the default PDCCH repeated transmission times to a terminal through broadcast signaling.
In a third aspect, an embodiment of the present application further provides a terminal, including a memory, a transceiver, and a processor;
a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and implementing the steps of the information transmission method according to the first aspect.
In a fourth aspect, an embodiment of the present application further provides a base station, which includes a memory, a transceiver, and a processor;
a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and implementing the steps of the information transmission method according to the second aspect.
In a fifth aspect, an embodiment of the present application further provides an information transmission apparatus, including:
the first receiving module is used for receiving the physical downlink control channel PDCCH repeated transmission indication information according to the number of times of the physical downlink control channel PDCCH repeated transmission which is defaulted; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality;
and the second receiving module is used for receiving the PDCCH information according to the PDCCH repeated transmission indication information.
In a sixth aspect, an embodiment of the present application further provides an information transmission apparatus, including:
the determining module is used for determining the repeated transmission indication information of the physical downlink control channel PDCCH according to the current channel quality;
and the sending module is used for sending the PDCCH repeated transmission indication information to the terminal according to the default PDCCH repeated transmission times so that the terminal can receive the PDCCH information according to the PDCCH repeated transmission indication information.
In a seventh aspect, this application embodiment further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, where the computer program is configured to cause the processor to execute the steps of the information transmission method according to the first aspect or the second aspect.
According to the information transmission method, the information transmission device, the terminal, the base station and the storage medium, the base station sends the PDCCH repeated transmission indication information to the terminal according to the current channel quality, and the terminal receives the PDCCH information according to the PDCCH repeated transmission indication information, so that the PDCCH repeated transmission times can be adaptively adjusted, and the demodulation performance of the PDCCH is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of physical downlink control channel scheduling;
fig. 2 is a schematic diagram of downlink coverage of a terminal with different receiving antennas;
fig. 3 is a schematic diagram of an information transmission method according to an embodiment of the present application;
fig. 4 is an interaction flow diagram of an information transmission method provided in an embodiment of the present application;
fig. 5 is a second schematic diagram of an information transmission method according to an embodiment of the present application;
fig. 6 is a schematic diagram of a PDCCH repetition mechanism based on DCI indication according to an embodiment of the present application;
fig. 7 is a schematic diagram of a PDCCH detection window provided in an embodiment of the present application;
fig. 8 is a schematic diagram of an effective starting point of PDCCH retransmission number update provided in an embodiment of the present application;
fig. 9 is a reference point diagram of K0 between a PDCCH and a PDSCH provided in an embodiment of the present application;
fig. 10 is a schematic diagram of a RepK NDI workflow provided by an embodiment of the present application;
fig. 11 is a flowchart of interaction between a base station and a terminal according to an embodiment of the present application;
fig. 12 is a schematic diagram of a PDCCH repetition mechanism based on MAC CE indication according to an embodiment of the present application;
fig. 13 is a schematic diagram of an effective starting point of PDCCH retransmission number update based on MAC CE indication according to an embodiment of the present application;
fig. 14 is an information element for indicating PDCCH retransmission by a MAC CE according to an embodiment of the present application;
fig. 15 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 16 is a schematic structural diagram of a base station according to an embodiment of the present application;
fig. 17 is a schematic diagram of an information transmission apparatus according to an embodiment of the present application;
fig. 18 is a second schematic diagram of an information transmission apparatus according to an embodiment of the present application.
Detailed Description
The method mainly solves the technical problem that in a fifth generation mobile communication New radio (5G NR) system, due to the fact that the times of repeated transmission (PDCCH repetition) of a semi-statically configured physical downlink control channel cannot be adjusted adaptively according to channel changes, the PDCCH repetition times can be influenced by the fact that the demodulation performance of a PDCCH is reduced or the network overhead is increased.
The Redcap terminal is mainly tailored to the current 5G universal terminal in terms of capability or complexity, for example: support for clipping of maximum bandwidth (from 100MHz bandwidth to 20MHz bandwidth), reduction of antenna count (from 4 receive antennas to 2 or 1 receive antenna).
Currently, a 5G base station (gNB) provides scheduling information of a UE Physical Downlink Shared Channel (PDSCH) through a Physical Downlink Control Channel (PDCCH).
Fig. 1 is a schematic diagram of physical downlink control channel scheduling, as shown in fig. 1. The 5G base station schedules a PDSCH through the PDCCH and sends the PDSCH to the terminal, and the terminal feeds back Hybrid Automatic Repeat reQuest acknowledgement (HARQ-ACK) information according to whether the PDSCH is decoded correctly or not.
FIG. 2 is a diagram illustrating downlink coverage of terminals with different receiving antennas, and as shown in FIG. 2, the downlink coverage radius of terminals with different numbers of receiving antennas is different (UE) 4RX >UE 2RX >UE 1RX ) This is because the transmission performance of the UE cannot reach the coverage of the original 4 antennas due to the reduction of the number of antennas, and if the UE with 1 antenna and 2 antennas is to be restored to the downlink coverage of the 4 antennas, the PDCCH needs to be enhanced.
Since the demodulation performance of the PDCCH may be degraded due to the reduction in the number of Redcap UE antennas, it is necessary to enhance the demodulation performance of the PDCCH. The conventional approach is to use a larger Aggregation Level (AL), but the red map is limited by the bandwidth size, and the AL is also limited, so that PDCCH repetition may be considered, but the conventional repetition method is semi-static scheduling, and if the channel changes rapidly, the PDCCH repetition times cannot be updated timely, which affects PDCCH demodulation performance and network overhead.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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.
Fig. 3 is a schematic diagram of an information transmission method provided in an embodiment of the present application, and as shown in fig. 3, an embodiment of the present application provides an information transmission method, an execution subject of which may be a terminal, and the method includes:
301, receiving PDCCH repeated transmission indication information according to the number of times of the PDCCH repeated transmission of a default physical downlink control channel; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality.
Specifically, fig. 4 is an interaction flow diagram of the information transmission method provided in the embodiment of the present application, and as shown in fig. 4, the base station determines PDCCH retransmission indication information according to the current channel quality.
The PDCCH repeated transmission indication information at least includes PDCCH repeated transmission times RepK. A new data indicator NDI may also be included.
And after determining the PDCCH repeated transmission indication information, the base station sends the PDCCH repeated transmission indication information to the terminal according to the default PDCCH repeated transmission times. The default number of PDCCH repeated transmissions may be previously transmitted to the terminal by the base station through broadcast signaling.
And the terminal receives PDCCH repeated transmission indication information according to the default PDCCH repeated transmission times.
And 302, receiving PDCCH information according to the PDCCH repeated transmission indication information.
Specifically, after receiving the PDCCH retransmission indication information, the terminal receives PDCCH information according to the PDCCH retransmission indication information.
After receiving the PDCCH repeated transmission indication information, the terminal may also send corresponding acknowledgement information to the base station. And after receiving the corresponding confirmation information and delaying for a preset time T, the base station sends the PDCCH information to the terminal.
According to the information transmission method provided by the embodiment of the application, the base station sends the PDCCH repeated transmission indication information to the terminal according to the current channel quality, and the terminal receives the PDCCH information according to the PDCCH repeated transmission indication information, so that the PDCCH repeated transmission times can be adaptively adjusted, and the demodulation performance of the PDCCH is improved.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by PDCCH, MAC CE, or RRC signaling.
Specifically, in the embodiment of the present application, the PDCCH retransmission indication Information received by the terminal may be carried by the PDCCH, that is, a PDCCH RepK indication field is added to Downlink Control Information (DCI).
It can also be carried by the medium access control element MAC CE, i.e. the information element of PDCCH repeated transmission is added in the MAC CE and the MAC CE is carried by the PDSCH.
Radio Resource Control (RRC) signaling bearers may also be used.
The information transmission method provided by the embodiment of the application can bear the PDCCH repeated transmission indication information through the PDCCH, the media access control element MAC CE or the radio resource control RRC signaling, and improves the flexibility of the system.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by downlink control information DCI.
Specifically, in the embodiment of the present application, the PDCCH retransmission indication Information received by the terminal may be carried by the PDCCH, that is, a PDCCH RepK indication field is added in Downlink Control Information (DCI), and the DCI carries the PDCCH retransmission indication Information.
According to the information transmission method provided by the embodiment of the application, the DCI carries the PDCCH repeated transmission indication information, so that the signaling overhead is reduced.
Based on any of the above embodiments, the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
and after delaying the preset time T, receiving the PDCCH information according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
Specifically, in the embodiment of the present application, after successfully demodulating the PDSCH of the PDCCH scheduled physical downlink shared channel, the terminal feeds back ACK information to the base station.
And the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information are effective after a preset time length T after the HARQ-ACK feedback of the PDSCH.
And the base station receives the ACK information fed back by the terminal.
And after receiving the ACK (acknowledgement character) information fed back by the terminal, the base station delays the preset time T, and then sends the PDCCH information to the terminal according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
And after the terminal feeds back the ACK confirmation information to the base station, delaying the preset time T, and then receiving the PDCCH information according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
According to the information transmission method provided by the embodiment of the application, after the base station receives the ACK information, the base station delays the preset time to send the PDCCH information, and after the terminal sends the ACK information, the terminal delays the preset time to receive the PDCCH information, so that the implementation time point of the updated PDCCH repeated transmission times is defined, the understanding of the terminal and the base station to the implementation point is consistent, and the receiving confusion of the PDCCH information is avoided.
Based on any of the above embodiments, when a physical uplink control channel PUCCH carrying the ACK information is not configured with a retransmission mechanism, the start time of T is a last OFDM symbol of a slot where the ACK information is located, or a first OFDM symbol of the slot where the ACK information is located, or a last OFDM symbol of OFDM symbols occupied by the ACK information, or a first OFDM symbol of OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
Specifically, in the embodiment of the present application, a method for determining a time point for updating the number of PDCCH repeated transmissions is as follows:
and updating the PDCCH repeated transmission times at a time point when the terminal determines that the PDCCH repeated transmission times indicated by the indication information are effective after a preset time length after the HARQ-ACK feedback of the PDSCH.
Further explanation is as follows: the beginning of the validity after the preset duration after the HARQ-ACK feedback of the PDSCH means that the first listening time (MO) after T time after the OFDM symbol where the PUCCH carrying ACK is located takes effect.
The method comprises the following steps: the preset duration T is expressed as a value in units of symbols, and the starting time reference point may be the first symbol or the last symbol of the PUCCH carrying HARQ-ACK, and may also be defined as the first symbol or the last symbol of the slot or the sub-slot in which the PUCCH carrying HARQ-ACK is located, that is, the definition in units of symbols is more detailed.
If the HARQ-ACK uses repeated transmission, the starting time reference point may be the first symbol or the last symbol of the last transmission or the first symbol or the last symbol of the first transmission in the PUCCH repeated transmission carrying the HARQ-ACK, and may of course be defined as the first symbol or the last symbol of the slot or sub-slot in which the last transmission or the first symbol of the slot or sub-slot in which the first transmission is located in the PUCCH repeated transmission carrying the HARQ-ACK.
The method 2 comprises the following steps: the preset duration T is represented as a value in units of slots or sub-slots, and the starting time reference point may be a slot or sub-slot where PUCCH transmission carrying HARQ-ACK is located.
If the HARQ-ACK uses repeated transmission, the starting time reference point may be a slot or sub-slot where the last transmission or the first transmission in the repeated transmission of the PUCCH carrying the HARQ-ACK is located.
Specifically, the HARQ-ACK may be an ACK, that is, when the PDSCH is correctly resolved, the effective time of the number of repeated transmissions is determined based on the ACK feedback time and the T time; for the case where the feedback is a NACK, there is no need to decide whether to take effect, since it is understood that the number of repeated transmissions may not be successfully received.
According to the information transmission method provided by the embodiment of the application, after the base station receives the ACK information, the base station delays the preset time to send the PDCCH information, and after the terminal sends the ACK information, the terminal delays the preset time to receive the PDCCH information, so that the implementation time point of the updated PDCCH repeated transmission times is defined, the understanding of the terminal and the base station to the implementation point is consistent, and the receiving confusion of the PDCCH information is avoided.
Based on any of the above embodiments, after delaying the preset time T, receiving PDCCH information according to the number of PDCCH retransmission times indicated by the PDCCH retransmission indication information, specifically including:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and receiving PDCCH information for a group according to the m PDCCH MOs.
Specifically, in the embodiment of the present application, a method for determining a PDCCH detection window:
and if the PDCCH repeated transmission times is m, starting PDCCH MO division by the terminal according to m PDCCH MOs as a group from a first PDCCH MO after adding a determined time to the OFDM symbol where the acknowledgement information ACK is sent, and receiving the PDCCH according to m PDCCH MOs as a group.
There are two methods for counting m PDCCH MOs:
(1) And continuously counting slots where the m PDCCH MOs are located, and if one MO contains a flexible symbol or a UL symbol, counting the slot into the m PDCCH MOs.
(2) When counting m PDCCH MOs, whether an MO includes a flexible symbol or an UL symbol is not counted in the PDCCH MO count.
According to the information transmission method provided by the embodiment of the application, the m PDCCH MOs are divided into a group according to the PDCCH repeated transmission times which are self-adaptively adjusted, and the PDCCH information is received as a group according to the m PDCCH MOs, so that the demodulation performance of the PDCCH is further improved.
Based on any of the above embodiments, the receiving PDCCH information for a group according to m PDCCH MOs specifically includes:
receiving PDCCH information by using PDCCH MOs in a group of PDCCH MOs one by one;
and if the PDCCH information is successfully demodulated by using the current kth PDCCH MO, the PDCCH information is not received by using the rest PDCCH MOs in the group, wherein k is less than m.
Specifically, in the embodiment of the present application, the specific steps of receiving PDCCH information according to m PDCCH MOs as a group are as follows:
the terminal receives PDCCH information by using PDCCH MOs in a set of PDCCH MOs one by one, and demodulates the PDCCH information while receiving the PDCCH information.
And if the PDCCH information is successfully demodulated by using the current kth PDCCH MO, the PDCCH information is not received by using the rest PDCCH MOs in the group, wherein k is less than m.
For example, the PDCCH is repeatedly transmitted for 10 times, and the terminal does not receive PDCCH information by using the 7 th to 10 th PDCCH MOs after successfully demodulating PDCCH information by using the 6 th PDCCH MO.
According to the information transmission method provided by the embodiment of the application, the terminal receives and demodulates the PDCCH information according to the self-adaptively adjusted PDCCH repeated transmission times in the process of receiving the PDCCH information, so that the network overhead is further reduced.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving an NDI which is not overturned and sent by a base station; the non-flipped NDI is sent by the base station after receiving the non-acknowledgement NACK information;
receiving PDCCH information according to the number of times of repeated transmission of the old PDCCH; and the old PDCCH repeated transmission times are the PDCCH repeated transmission times configured for the terminal by the base station in the last PDCCH repeated transmission time adjusting period.
Specifically, in order to prevent the base station and the terminal from understanding inconsistency of the number of repeated transmissions of the PDCCH due to false detection and missed detection of HARQ-ACK feedback, the embodiment of the present application adopts the following mechanism: the PDCCH retransmission indication information includes PDCCH retransmission times and a new data indicator NDI, i.e. a new indication information field PDCCH Repk NDI is introduced, and the effect of this indication field is to perform a flip (from 0 to 1 or from 1 to 0) at the time of the Repk update. And if the base station implements the new PDCCH repeated transmission times at the time point of updating the PDCCH repeated transmission times, and simultaneously turns the PDCCH Repk NDI. However, when the HARQ-ACK information sent by the terminal is ACK, the base station receives NACK, at this time, the base station transmits the PDCCH according to the old PDCCH retransmission times at a time point when the PDCCH retransmission times are updated, while the PDCCH RepK NDI remains unchanged, and when the terminal receives the PDCCH, it is known that the current PDCCH retransmission times are not changed by detecting that the PDCCH RepK NDI is not inverted, and then receives a subsequent PDCCH according to the old PDCCH retransmission times.
The specific steps of the terminal receiving the PDCCH information according to the PDCCH repeated transmission indication information are as follows:
and if the PDSCH scheduled by the PDCCH is successfully demodulated, the terminal feeds back acknowledgement ACK information to the base station.
However, the base station receives the non-acknowledgement NACK message due to various factors, and then transmits the non-flipped NDI to the terminal.
And the terminal receives the non-overturned NDI sent by the base station.
Then, receiving PDCCH information according to the number of times of repeated transmission of the old PDCCH; the number of times of the old PDCCH retransmission is the number of times of PDCCH retransmission configured for the terminal by the base station in the last PDCCH retransmission number adjustment period.
According to the information transmission method provided by the embodiment of the application, the PDCCH repeated transmission indication information comprises the PDCCH repeated transmission times and the NDI, so that the condition that the understanding of the PDCCH repeated transmission times is inconsistent due to false detection and missed detection of HARQ-ACK feedback of a base station and a terminal is avoided.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving the turned NDI sent by the base station; the inverted NDI is sent by the base station after receiving the acknowledgement ACK message;
and receiving the PDCCH information according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
Specifically, in order to prevent the base station and the terminal from understanding inconsistency of the number of repeated transmissions of the PDCCH due to false detection and missed detection of HARQ-ACK feedback, the embodiment of the present application adopts the following mechanism: the PDCCH retransmission indication information includes PDCCH retransmission times and a new data indicator NDI, i.e. a new indication information field PDCCH Repk NDI is introduced, and the effect of this indication field is to perform a flip (from 0 to 1 or from 1 to 0) at the time of the Repk update.
The specific steps of the terminal receiving the PDCCH information according to the PDCCH repeated transmission indication information are as follows:
and if the PDSCH scheduled by the PDCCH is successfully demodulated, the terminal feeds back acknowledgement ACK information to the base station.
And after receiving the ACK information, the base station sends the inverted NDI to the terminal.
And the terminal receives the inverted NDI sent by the base station.
Then, the PDCCH information is received according to the PDCCH retransmission times included in the PDCCH retransmission indication information.
According to the information transmission method provided by the embodiment of the application, the PDCCH repeated transmission indication information comprises the PDCCH repeated transmission times and the NDI, so that the condition that the understanding of the PDCCH repeated transmission times is inconsistent due to false detection and missed detection of HARQ-ACK feedback of a base station and a terminal is avoided.
Based on any of the above embodiments, the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
receiving PDCCH information according to the PDCCH repeated transmission indication information;
counting the times of unsuccessfully receiving PDCCH information;
and if the number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold value, initiating random access to the base station, wherein the preset threshold value is configured through high-level signaling or is a preset constant.
Specifically, when the HARQ-ACK information sent by the terminal is NACK, the base station receives the ACK, and then the base station performs a new PDCCH retransmission number and reverses the PDCCH RepK NDI at a time point when the PDCCH retransmission number is updated. At this time, the terminal has two situations:
case 1: the number of repeated transmissions of the PDCCH is carried on the PDCCH, and at this time, if the terminal successfully demodulates the PDCCH but cannot demodulate the PDSCH, the terminal replies NACK but the base station receives ACK, and then the terminal continues to be able to demodulate as many times as the number of repeated transmissions of the PDCCH. If the terminal does not successfully demodulate the PDCCH, the terminal can only try to blindly decode the PDCCH and the repeated transmission times, and at this time, the terminal and the base station have inconsistency in understanding of the repeated transmission times of the PDCCH.
Case 2: the number of repeated transmissions of the PDCCH is carried on the MAC CE and transmitted on the PDSCH. When the HARQ-ACK information sent by the terminal is NACK, the base station receives ACK. This may also cause inconsistency in understanding of the PDCCH retransmission times by the terminal and the base station when the base station performs a new PDCCH retransmission times at a time point of PDCCH retransmission times update.
Aiming at the condition that the terminal and the base station understand the PDCCH repeated transmission times to be inconsistent, a PDCCH reset mechanism is introduced, namely, the terminal receives the PDCCH according to the old PDCCH repeated times at the PDCCH repeated time updating time point, if the receiving fails, a reset counter is added with 1 and feeds back the NACK, when the terminal reset counter reaches a preset time N, the terminal resets the PDCCH Repk to a default value M, the reset counter is reset, and a random access request is initiated to the base station.
According to the information transmission method provided by the embodiment of the application, a PDCCH reset mechanism is introduced, so that the situation that the terminal cannot successfully demodulate the PDCCH all the time and falls into endless loop is avoided, and the reliability of the system is improved.
Based on any of the above embodiments, after initiating the random access to the base station, the method further includes:
and receiving PDCCH information according to the default PDCCH repeated transmission times.
Specifically, in this embodiment of the present application, after the terminal finishes a random access process, the base station resets the number of PDCCH retransmission times to M, for example, M takes a value of 4, and the base station sends the PDCCH according to the number of PDCCH retransmission times as M, so that the base station and the terminal reset the PDCCH Repk, and thus the base station and the terminal keep understanding of the PDCCH retransmission times consistent.
According to the information transmission method provided by the embodiment of the application, after the terminal finishes the random access process, the terminal receives the PDCCH information according to the default PDCCH repeated transmission times, and the base station sends the PDCCH information according to the default PDCCH repeated transmission times, so that the understanding of the base station and the terminal on the PDCCH repeated transmission times is kept consistent, and the reliability of the system is improved.
Based on any of the above embodiments, the default PDCCH retransmission times is sent to the terminal by the base station in advance through broadcast signaling.
Specifically, the default number of PDCCH retransmission times is transmitted to the terminal by the base station through broadcast signaling in advance.
According to the information transmission method provided by the embodiment of the application, the default PDCCH repeated transmission times are sent to the terminal of the terminal by the base station through the broadcast signaling in advance, so that the understanding of the base station and the terminal on the PDCCH repeated transmission times is kept consistent after the terminal fails to demodulate the PDCCH for many times, and the reliability of the system is improved.
Based on any of the above embodiments, fig. 5 is a second schematic diagram of an information transmission method provided in the present embodiment, and as shown in fig. 5, an execution subject of the information transmission method provided in the present embodiment may be a network side device, for example, a base station. The method comprises the following steps:
And 502, sending the PDCCH repeated transmission indication information to the terminal according to the default PDCCH repeated transmission times so that the terminal can receive the PDCCH information according to the PDCCH repeated transmission indication information.
Specifically, an information transmission method provided in this embodiment of the present application is the same as the method described in the corresponding embodiment, and can achieve the same technical effects, except that the execution main bodies are different, and detailed descriptions of the same parts and beneficial effects in this embodiment as those in the corresponding method embodiment are not repeated herein.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by PDCCH, MAC CE, or RRC signaling.
Specifically, an information transmission method provided in this embodiment of the present application is the same as the method described in the corresponding embodiment, and can achieve the same technical effects, except that the execution main bodies are different, and detailed descriptions of the same parts and beneficial effects in this embodiment as those in the corresponding method embodiment are not repeated herein.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by downlink control information DCI.
Specifically, an information transmission method provided in this embodiment is the same as the method described in the corresponding embodiment above, and can achieve the same technical effects, and the difference is only that the execution main bodies are different, and detailed descriptions of the same portions and beneficial effects as those in the corresponding method embodiment above in this embodiment are not repeated here.
Based on any of the above embodiments, after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by the terminal; the ACK information is fed back by the terminal after the physical downlink shared channel PDSCH scheduled by the PDCCH is successfully demodulated;
and after delaying the preset time T, sending the PDCCH information to the terminal according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
Specifically, an information transmission method provided in this embodiment is the same as the method described in the corresponding embodiment above, and can achieve the same technical effects, and the difference is only that the execution main bodies are different, and detailed descriptions of the same portions and beneficial effects as those in the corresponding method embodiment above in this embodiment are not repeated here.
Based on any of the above embodiments, when a physical uplink control channel PUCCH carrying the ACK information is not configured with a repeat transmission mechanism, the starting time of T is a last OFDM symbol of a slot where the ACK information is located, or is a first OFDM symbol of the slot where the ACK information is located, or is a last OFDM symbol of OFDM symbols occupied by the ACK information, or is a first OFDM symbol of OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
Specifically, an information transmission method provided in this embodiment of the present application is the same as the method described in the corresponding embodiment, and can achieve the same technical effects, except that the execution main bodies are different, and detailed descriptions of the same parts and beneficial effects in this embodiment as those in the corresponding method embodiment are not repeated herein.
Based on any of the embodiments, after delaying the preset time T, sending PDCCH information to the terminal according to the number of PDCCH retransmission times indicated by the PDCCH retransmission indication information, specifically including:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and sending the PDCCH information to the terminal according to the m PDCCH MOs as a group.
Specifically, an information transmission method provided in this embodiment of the present application is the same as the method described in the corresponding embodiment, and can achieve the same technical effects, except that the execution main bodies are different, and detailed descriptions of the same parts and beneficial effects in this embodiment as those in the corresponding method embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving non-acknowledgement (NACK) information fed back by a terminal;
the NDI which is not overturned is sent to the terminal, and the PDCCH information is sent to the terminal according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
Specifically, an information transmission method provided in this embodiment of the present application is the same as the method described in the corresponding embodiment, and can achieve the same technical effects, except that the execution main bodies are different, and detailed descriptions of the same parts and beneficial effects in this embodiment as those in the corresponding method embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by a terminal;
and sending the PDCCH information to the terminal according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
Specifically, an information transmission method provided in this embodiment of the present application is the same as the method described in the corresponding embodiment, and can achieve the same technical effects, except that the execution main bodies are different, and detailed descriptions of the same parts and beneficial effects in this embodiment as those in the corresponding method embodiment are not repeated herein.
Based on any of the above embodiments, after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving a random access request sent by a terminal; the random access request is sent by the terminal when the counted number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold, wherein the preset threshold is configured through a high-level signaling or is a preset constant.
Specifically, an information transmission method provided in this embodiment is the same as the method described in the corresponding embodiment above, and can achieve the same technical effects, and the difference is only that the execution main bodies are different, and detailed descriptions of the same portions and beneficial effects as those in the corresponding method embodiment above in this embodiment are not repeated here.
Based on any of the above embodiments, after receiving the random access request sent by the terminal, the method further includes:
and sending PDCCH information to the terminal according to the default PDCCH repeated transmission times.
Specifically, an information transmission method provided in this embodiment of the present application is the same as the method described in the corresponding embodiment, and can achieve the same technical effects, except that the execution main bodies are different, and detailed descriptions of the same parts and beneficial effects in this embodiment as those in the corresponding method embodiment are not repeated herein.
Based on any of the above embodiments, before sending the PDCCH retransmission indication information to the terminal according to the default PDCCH retransmission times, the method further includes:
and sending the default PDCCH repeated transmission times to a terminal through broadcast signaling.
Specifically, an information transmission method provided in this embodiment is the same as the method described in the corresponding embodiment above, and can achieve the same technical effects, and the difference is only that the execution main bodies are different, and detailed descriptions of the same portions and beneficial effects as those in the corresponding method embodiment above in this embodiment are not repeated here.
The method in each of the above embodiments is described below by two specific examples:
example 1:
the present embodiment carries PDCCH retransmission indication information (PDCCH RepK) through the PDCCH, and the indication information is used to update the PDCCH retransmission times. The UE determines the number of PDCCH transmissions and is thus able to determine the receive PDCCH time window. The UE improves PDCCH demodulation performance by combining the PDCCHs in the receiving window. The size of the PDCCH time window is related to RepK, and fig. 6 is a schematic diagram of a PDCCH repetition mechanism based on DCI indication according to an embodiment of the present disclosure, as shown in fig. 6. If Repk =2, the terminal divides PDCCH MOs into a group according to m PDCCH MOs from a first PDCCH MO after adding a determined time to an OFDM symbol where the acknowledgement information ACK is sent, and receives PDCCH according to the group of m PDCCH MOs. There are two methods for counting m PDCCH MOs, specifically as follows:
the method comprises the following steps: continuously counting slots in which m PDCCH MOs are located, and if a flexible slot or UL slot is encountered and is also counted in the m PDCCH MOs, method 2: the m PDCCH MOs are discontinuous, and when the m PDCCH MOs are counted, the flexible slot or UL slot is not considered and is not counted. Fig. 7 is a schematic diagram of a PDCCH detection window provided in the embodiment of the present application, as shown in fig. 7. The specific PDCCH repetition transmission update mechanism is as follows:
(1) The gNB sends PDCCH repeated transmission indication information RepK =2 in the PDCCH MO for updating the current 1 transmission to 2 repeated transmissions.
(2) After the terminal sends the first PDCCH MO after T is added to the OFDM symbol where the acknowledgement information is located, repK =2 is implemented by the gNB, after the PDCCH MO becomes effective, the gNB sends 2 times of the same PDCCH to the UE in the PDCCH detection window, and simultaneously the gNB sends PDCCH repeated transmission indication information RepK =3 in the PDCCH MO to update the current PDCCH 2 times of repeated transmission to 3 times of repeated transmission.
(3) And the gNB implements Repk =3 according to the time that the terminal sends the confirmation information and the first PDCCH MO after T, the gNB sends 3 times of the same PDCCH to the UE in a PDCCH detection window after the Repk =3 takes effect in the PDCCH MO, and the gNB sends PDCCH repeated transmission indication information Repk =1 in the PDCCH MO at the same time for updating the current 3 times of PDCCH repeated transmission into 1 time of transmission.
(4) After the terminal sends the first PDCCH MO after T is added to the OFDM symbol where the acknowledgement information is located, repK =1 is implemented by the gNB, and after the PDCCH MO becomes effective, the gNB sends 1-time PDCCH to the UE in the PDCCH detection window, and simultaneously the gNB sends PDCCH repeated transmission indication information RepK =4 in the PDCCH MO to update the current PDCCH 1-time transmission to 4-time repeated transmission.
Next, an effective starting point of the PDCCH repetition times needs to be determined, fig. 8 is a schematic view of an effective starting point of PDCCH repetition transmission times updating provided in the embodiment of the present application, and as shown in fig. 8, first, the RepK is carried in DCI by a repetition indication of a PDCCH, and second, the effective starting point of PDCCH repetition times is determined according to PDSCH feedback information scheduled by the PDCCH. That is, after the UE successfully receives the PDCCH and demodulates the PDSCH, the UE may feed back an ACK to the gNB on the PUCCH. The gNB receiving the ACK of the UE knows that the UE has successfully received the PDCCH carrying the repeated indication Repk of the PDCCH. Therefore, the gNB performs a new PDCCH retransmission number on the first PDCCH MO after T is added to the OFDM symbol where the terminal sends the acknowledgement information. For UE, after sending PDSCH feedback information ACK scheduled by PDCCH carrying repetition indication Repk of PDCCH, the UE waits for T (T >0, T is mainly processing time reserved for gNB), and then the first PDCCH MO implements new PDCCH repeated transmission times. The currently designed PDCCH Repk >0 bits, e.g. 3 bits, can support a minimum of single transmission and a maximum of 8 PDCCH repeated transmissions, which range from [1,8], and is specifically defined in table 1.
Table 1 new information bit indication in PDCCH repK related DCI
The reference point of the starting time of T is the first OFDM symbol of the slot where the ACK fed back by the PUCCH is located, and the last OFDM symbol of the slot where the ACK fed back by the PUCCH is located. If the PUCCH is accompanied by repetition, the starting time reference point of T (the unit of T is Slot or OFDM symbol) is the last OFDM symbol of the entire PUCCH repetition burst or the first OFDM symbol of the PUCCH repetition burst. Or according to the OFDM symbol where the ACK fed back by the PUCCH is located as the starting time reference point, if the ACK fed back by the PUCCH occupies a plurality of OFDM symbols, the occupied last OFDM symbol can be used as the starting time reference point or according to the first OFDM symbol as the starting time reference point.
Fig. 9 is a reference point diagram of K0 between a PDCCH and a PDSCH provided in the embodiment of the present application, and as shown in fig. 9, a starting reference point of a Slot interval K0 between a downlink scheduling DCI and a PDSCH scheduled by the downlink scheduling DCI is a last PDCCH of a PDCCH detection window, that is, a last PDCCH of PDCCH repeated transmission is a starting reference point.
In addition, in order to solve the problem that when the RepK is updated, the situation that the base station and the terminal understand the RepK inconsistently is mainly divided into two scenes:
1. when the terminal sends the ACK to the base station, but the base station receives the NACK, then the base station still sends the ACK to the terminal according to the old Repk, but at this time, the terminal considers that the base station sends the PDCCH according to the updated Reck;
2. when the terminal sends NACK to the base station but the base station receives ACK, the base station sends the NACK to the terminal according to the updated Repk, but the terminal still receives the ACK according to the old Repk
A new indication information field PDCCH Repk NDI is introduced, where the indication field is used to perform a flipping operation (from 0 to 1 or from 1 to 0) during a Repk update, and fig. 10 is a schematic view of a workflow of the Repk NDI provided in this embodiment, as shown in fig. 10. And meanwhile, a PDCCH reset mechanism is introduced, namely after the base station receives NACK for a plurality of times, the PDCCH Repk is reset to M, for example, the value of M is 4, so that the base station and the terminal reset the PDCCH Repk, and the base station and the terminal keep the understanding of the PDCCH repeated transmission times consistent. And if the base station implements the new PDCCH repeated transmission times at the time point of updating the PDCCH repeated transmission times, and simultaneously turns the PDCCH Repk NDI. However, when the HARQ-ACK information sent by the terminal is ACK, the base station receives NACK, and at this time, the base station transmits the PDCCH according to the old PDCCH retransmission times at the time point when the PDCCH retransmission times are updated, while the PDCCH RepK NDI remains unchanged, and when the terminal receives the PDCCH, it is known that the current PDCCH retransmission times are not changed by detecting that the PDCCH RepK NDI is not inverted, and then receives the subsequent PDCCH according to the old PDCCH retransmission times. When the HARQ-ACK information sent by the terminal is NACK, the base station receives the ACK, and then the base station implements the new PDCCH repeated transmission times at the time point of updating the PDCCH repeated transmission times and simultaneously turns over the PDCCH RepKNDI. There are two situations in the terminal at this time,
case 1: the number of repeated transmissions of the PDCCH is carried on the PDCCH, and at this time, if the terminal successfully demodulates the PDCCH but cannot demodulate the PDSCH, the terminal can continue to demodulate according to the new number of repeated transmissions of the PDCCH. If the terminal does not successfully demodulate the PDCCH, the terminal can only attempt to blindly demodulate the PDCCH and the number of retransmission times, at which time the terminal and the base station are not identical in understanding of the number of retransmission times of the PDCCH.
Case 2: the number of repeated transmissions of the PDCCH is carried on the MAC CE and transmitted on the PDSCH. When the HARQ-ACK information sent by the terminal is NACK, the base station receives ACK. This may also cause inconsistency in understanding of the PDCCH retransmission times by the terminal and the base station when the base station performs a new PDCCH retransmission times at a time point of PDCCH retransmission times update.
And for the situation that the terminal and the base station are inconsistent in understanding of the PDCCH repeated transmission times, introducing a PDCCH reset mechanism, namely, the terminal receives the PDCCH at the PDCCH repeated time updating time point according to the old PDCCH repeated times, if the receiving fails, adding 1 to a reset counter and feeding back the NACK, and after the terminal reset counter reaches N times, resetting the PDCCH of the terminal to a default value. The reset counter is cleared. The terminal resets the PDCCH repeated transmission times to M, and initiates a random access request to the base station, after the random access process is finished, the base station resets the PDCCH repeated transmission times to M, for example, the value of M is 4, and the base station sends the PDCCH according to the PDCCH repeated transmission times as M, so that the base station and the terminal reset the PDCCH Repk, and the understanding of the base station and the terminal on the PDCCH repeated transmission times is kept consistent.
Fig. 11 is a flowchart of interaction between a base station and a terminal according to an embodiment of the present application, and as shown in fig. 11, from a network perspective, a complete process may include the following 6 steps:
1. the base station first transmits PDCCH repeat transmission indication information PDCCH RepK (for updating the number of PDCCH repeat transmissions) RepK NDI =0.
2. The gNB performs an updated RepK on the first PDCCH MO after the terminal sends T to the OFDM symbol where the acknowledgement information ACK is located, and reverses the RepK NDI from 0 to 1.
3. The base station transmits the flipped NDI information and waits for feedback information.
4. And after receiving the feedback information, if the feedback information is ACK, the base station sends PDCCH according to the new PDDCH Repk.
5. And if the feedback information is NACK, sending the PDCCH again according to the repeated sending times of the old PDCCH, carrying the updated PDCCH Repk to the terminal, and turning the Repk NDI to be set to be 0, and meanwhile, waiting for the feedback of the terminal.
6. After receiving a random access request of a terminal, a base station completes a random access process, resets the repeated transmission times of the PDCCH to a default value, and then transmits the PDCCH to the terminal.
From the terminal perspective, a complete process may include the following 9 steps:
1. after the terminal receives the PDCCH retransmission indication information PDCCH RepK, the terminal sends an acknowledgement information ACK to the base station through a message Acknowledgement (ACK) mechanism (an acknowledgement mechanism for the PDCCH scheduled PDSCH).
2. And the terminal still receives the PDCCH sent by the base station by using the old PDCCH repeated transmission indication information during waiting for the base station to implement the new PDCCH repeated transmission times.
3. After T time is added to the OFDM symbol where the acknowledgement information ACK is sent from the terminal, if the terminal does not successfully receive the PDCCH, NACK is fed back, and a reset counter is added by 1.
4. If the terminal successfully receives the PDCCH, the NDI value is firstly checked, if the NDI is not inverted, the NDI value is the old PDCCH Repk value, the terminal successfully demodulates the PDSCH and then replies ACK and continuously demodulates the subsequent PDCCH by using the old PDDCH Repk.
5. If the NDI is a new PDCCH Repk value after being inverted, whether the check receives the new PDCCH Repk value is required, if the NDI is received, an ACK is replied after the PDSCH is successfully demodulated, the subsequent PDCCH is continuously demodulated according to the new PDCCH Repk value, if the new PDCCH Reck is not received, the NACK is fed back, and a reset counter is increased by 1, and meanwhile, the subsequent PDCCH is continuously demodulated by using the old PDDCH Repk.
6. And after the terminal reset counter reaches N times, the terminal resets the PDCCH repeated transmission times to a default value. The reset counter is cleared and random access is initiated.
7. And after the random access process is finished, receiving the PDCCH according to the number of times of repeated transmission of the default PDCCH.
In addition, when the terminal does not receive the PDCCH repeated transmission indication information PDCCH Repk processing flow.
8. When the terminal does not receive the PDCCH repeat transmission indication information PDCCH Repk, the terminal replies that the NACK eset counter is increased by 1 and simultaneously continues to demodulate the subsequent PDCCH by using the old PDDCH Reck.
9. And after the terminal reset counter reaches N times, the terminal resets the PDCCH repeated transmission times to a default value. The reset counter is cleared and random access is initiated.
Example 2:
in this embodiment, the MAC CE issues retransmission indication information (PDCCH RepK) to be carried on the PDSCH, where the indication information is used to update the PDCCH retransmission times. The UE determines the PDCCH transmission times so as to determine a PDCCH receiving time window, fig. 12 is a schematic diagram of a PDCCH repeating mechanism based on MAC CE indication according to an embodiment of the present application, and as shown in fig. 12, a specific PDCCH repeating transmission update mechanism is as follows:
(1) The gNB transmits PDCCH repeated transmission indication information RepK =2 in the PDSCH scheduled by the PDCCH MO i for updating the current 1 transmission to 2 repeated transmissions.
(2) After the terminal sends the first PDCCH MO after T is added to the OFDM symbol where the acknowledgement information is located, repK =2 is implemented by the gNB, after the PDCCH MO j becomes effective, the gNB sends 2 times the same PDCCH to the UE in the PDCCH detection window, and simultaneously the gNB sends PDCCH repeated transmission indication information RepK =3 in the PDSCH called by the PDCCH MO j for updating the current PDCCH 2 times repeated transmission to 3 times repeated transmission.
(3) After the terminal sends the first PDCCH MO after T is added to the OFDM symbol where the acknowledgement information is located, repK =3 is implemented by the gNB, after RepK =3 is validated by the PDCCH MO k, the gNB sends the same PDCCH to the UE 3 times in the PDCCH detection window, and simultaneously the gNB sends PDCCH repeated transmission indication information RepK =1 in the PDSCH called by the PDCCH MO k for updating the current PDCCH 3 times to 1 time transmission.
(4) After the terminal sends the first PDCCH MO after T is added to the OFDM symbol where the acknowledgement information is located, repK =1, and after the PDCCH MO p becomes effective, the gNB sends 1-time PDCCH to the UE in the PDCCH detection window, and simultaneously the gNB sends PDCCH repeated transmission indication information RepK =4 in the PDSCH called by the PDCCH MO p for updating the current PDCCH 1-time transmission to 4-time repeated transmission.
Fig. 13 is a schematic diagram of an effective starting point updated based on PDCCH retransmission times indicated by a MAC CE according to an embodiment of the present application, and as shown in fig. 13, a method for determining an effective starting point of PDCCH repetition times is as follows:
firstly, the repetition indication Repk of the PDCCH is carried by the PDSCH on the MAC CE, and secondly, the effective starting point of the PDCCH repetition times is determined according to the PDSCH feedback information carrying the MAC CE (containing the PDCCH repeated transmission indication). After the UE successfully demodulates the PDSCH, the UE may feed back an ACK to the gNB on the PUCCH. The gNB receiving the UE ACK knows that the UE has successfully received the MAC CE carrying the PDCCH, which is the repetition indication Repk. Therefore, the gNB performs a new PDCCH retransmission number in the first PDCCH MO after T is added to the OFDM symbol where the terminal sends the acknowledgement information. For UE, after the UE sends PDSCH feedback information ACK carrying PDCCH repeat indication Repk, a T (T is more than 0 and is mainly the processing time reserved by gNB) is added to an OFDM symbol where the ACK is located, and the first PDCCH MO carries out new PDCCH repeat transmission times. The currently designed PDCCH Repk is >0 bits, fig. 14 is an information element indicating PDCCH retransmission provided by the MAC CE according to the embodiment of the present application, and the 4-bit PDCCH repetition number MAC CE information element in fig. 14 can support PDCCH retransmission with a minimum of single transmission and a maximum of 16 transmissions, which is in the range of [1,16].
As shown in fig. 9, the starting reference point of the Slot interval K0 between the downlink scheduling DCI and the PDSCH scheduled by the downlink scheduling DCI is the last PDCCH of the PDCCH detection window, i.e., the last PDCCH of PDCCH repeated transmission.
Based on the PDCCH retransmission times indicated by the MAC CE, a new indication information field PDCCH Repk NDI and a PDCCH reset mechanism are also required to be introduced to keep the understanding of the base station and the terminal for the PDCCH retransmission times consistent.
According to the embodiment of the application, the PDCCH SINR is enhanced by introducing a dynamic PDCCH repeated transmission mechanism, so that the demodulation threshold of the PDCCH is reduced. Meanwhile, the flexible dynamic PDCCH repeated transmission mechanism can dynamically adjust the PDCCH repeated times according to the channel condition, thereby effectively reducing the network overhead while ensuring the PDCCH demodulation performance.
Based on any of the above embodiments, fig. 15 is a schematic structural diagram of a terminal provided in an embodiment of the present application, and as shown in fig. 15, the terminal includes a memory 1520, a transceiver 1500, and a processor 1510:
a memory 1520 for storing a computer program; a transceiver 1500 for transceiving data under the control of the processor 1510; a processor 1510 for reading the computer program in the memory 1520 and performing the following operations:
receiving PDCCH repeated transmission indication information according to the number of times of the PDCCH repeated transmission of the default physical downlink control channel; the PDCCH repeated transmission indication information is determined by a base station according to the current channel quality;
and receiving PDCCH information according to the PDCCH repeated transmission indication information.
In particular, the transceiver 1500, is configured to receive and transmit data under the control of the processor 1510.
In fig. 15, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1510 and various circuits of memory represented by memory 1520 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1500 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over transmission media including wireless channels, wired channels, fiber optic cables, and the like. The user interface 1530 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 1510 is responsible for managing the bus architecture and general processing, and the memory 1520 may store data used by the processor 1510 in performing operations.
Optionally, the processor 1510 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a CPLD (Complex Programmable Logic Device), and the processor may also adopt a multi-core architecture.
The processor is used for executing any one of the methods provided by the embodiment of the application according to the obtained executable instructions by calling the computer program stored in the memory. The processor and memory may also be physically separated.
It should be noted that, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by PDCCH, MAC CE, or RRC signaling.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by downlink control information DCI.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
and after delaying the preset time T, receiving the PDCCH information according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, when a physical uplink control channel PUCCH carrying the ACK information is not configured with a retransmission mechanism, the start time of T is a last OFDM symbol of a slot where the ACK information is located, or a first OFDM symbol of the slot where the ACK information is located, or a last OFDM symbol of OFDM symbols occupied by the ACK information, or a first OFDM symbol of OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after delaying the preset time T, receiving PDCCH information according to the number of PDCCH retransmission times indicated by the PDCCH retransmission indication information, specifically including:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the number of PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and receiving PDCCH information for a group according to the m PDCCH MOs.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.
Based on any of the above embodiments, the receiving PDCCH information for a group according to m PDCCH MOs specifically includes:
receiving PDCCH information by using PDCCH MOs in a group of PDCCH MOs one by one;
and if the PDCCH information is successfully demodulated by using the current kth PDCCH MO, the PDCCH information is not received by using the rest PDCCH MOs in the group, wherein k is less than m.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving an NDI which is not overturned and sent by a base station; the non-flipped NDI is sent by the base station after receiving the non-acknowledgement NACK information;
receiving PDCCH information according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving the turned NDI sent by the base station; the inverted NDI is sent by the base station after receiving the acknowledgement ACK message;
and receiving the PDCCH information according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
receiving PDCCH information according to the PDCCH repeated transmission indication information;
counting the times of unsuccessfully receiving PDCCH information;
and if the number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold value, initiating random access to the base station, wherein the preset threshold value is configured through a high-level signaling or is a preset constant.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after initiating the random access to the base station, the method further includes:
and receiving PDCCH information according to the default PDCCH repeated transmission times.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.
Based on any of the above embodiments, the default number of PDCCH retransmission times is sent to the terminal by the base station in advance through broadcast signaling.
Specifically, the terminal provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, fig. 16 is a schematic structural diagram of a base station provided in this embodiment of the present application, as shown in fig. 16, the base station includes a memory 1620, a transceiver 1600, a processor 1610:
a memory 1620 for storing computer programs; a transceiver 1600 for transceiving data under the control of the processor 1610; a processor 1610 configured to read the computer program in the memory 1620 and execute the following operations:
determining the repeated transmission indication information of a Physical Downlink Control Channel (PDCCH) according to the current channel quality;
and sending the PDCCH repeated transmission indication information to the terminal according to the default PDCCH repeated transmission times so that the terminal can receive the PDCCH information according to the PDCCH repeated transmission indication information.
And in particular, a transceiver 1600 for receiving and transmitting data under the control of the processor 1610.
In fig. 16, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 1610, and various circuits, represented by the memory 1620, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1600 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The processor 1610 is responsible for managing the bus architecture and general processing, and the memory 1620 may store data used by the processor 1610 in performing operations.
The processor 1610 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.
It should be noted that, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by PDCCH, MAC CE, or RRC signaling.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by downlink control information DCI.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by the terminal; the ACK information is fed back by the terminal after the physical downlink shared channel PDSCH scheduled by the PDCCH is successfully demodulated;
and after delaying the preset time T, sending the PDCCH information to the terminal according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, when a physical uplink control channel PUCCH carrying the ACK information is not configured with a retransmission mechanism, the start time of T is a last OFDM symbol of a slot where the ACK information is located, or a first OFDM symbol of the slot where the ACK information is located, or a last OFDM symbol of OFDM symbols occupied by the ACK information, or a first OFDM symbol of OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after delaying the preset time T, sending PDCCH information to the terminal according to the PDCCH retransmission times indicated by the PDCCH retransmission indication information, specifically including:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and sending the PDCCH information to the terminal according to the m PDCCH MOs as a group.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving non-acknowledgement (NACK) information fed back by a terminal;
sending the NDI which is not turned over to the terminal, and sending PDCCH information to the terminal according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by a terminal;
and sending the PDCCH information to the terminal according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving a random access request sent by a terminal; the random access request is sent by the terminal when the counted number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold, wherein the preset threshold is configured through a high-level signaling or is a preset constant.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after receiving the random access request sent by the terminal, the method further includes:
and sending PDCCH information to a terminal according to the default PDCCH repeated transmission times.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, before sending the PDCCH retransmission indication information to the terminal according to the default PDCCH retransmission times, the method further includes:
and sending the default PDCCH repeated transmission times to a terminal through broadcast signaling.
Specifically, the base station provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, fig. 17 is a schematic diagram of an information transmission apparatus provided in an embodiment of the present application, and as shown in fig. 17, the information transmission apparatus includes a first receiving module 1701 and a second receiving module 1702, where:
a first receiving module 1701, configured to receive physical downlink control channel PDCCH retransmission indication information according to a default number of times of PDCCH retransmission; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality;
a second receiving module 1702, configured to receive PDCCH information according to the PDCCH repeated transmission indication information.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by PDCCH, MAC CE, or RRC signaling.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by downlink control information DCI.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
and after delaying the preset time T, receiving the PDCCH information according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, when a physical uplink control channel PUCCH carrying the ACK information is not configured with a repeat transmission mechanism, the starting time of T is a last OFDM symbol of a slot where the ACK information is located, or is a first OFDM symbol of the slot where the ACK information is located, or is a last OFDM symbol of OFDM symbols occupied by the ACK information, or is a first OFDM symbol of OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after delaying the preset time T, receiving PDCCH information according to the number of PDCCH retransmission times indicated by the PDCCH retransmission indication information, specifically including:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and receiving PDCCH information for a group according to the m PDCCH MOs.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the receiving PDCCH information for a group according to m PDCCH MOs specifically includes:
receiving PDCCH information by using PDCCH MOs in a group of PDCCH MOs one by one;
and if the PDCCH information is successfully demodulated by using the current kth PDCCH MO, the PDCCH information is not received by using the rest PDCCH MOs in the group, wherein k is less than m.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving an NDI which is not overturned and sent by a base station; the non-flipped NDI is sent by the base station after receiving the non-acknowledgement NACK information;
receiving PDCCH information according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving the turned NDI sent by the base station; the inverted NDI is sent by the base station after receiving the acknowledgement ACK message;
and receiving the PDCCH information according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
receiving PDCCH information according to the PDCCH repeated transmission indication information;
counting the times of unsuccessfully receiving PDCCH information;
and if the number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold value, initiating random access to the base station, wherein the preset threshold value is configured through high-level signaling or is a preset constant.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after initiating the random access to the base station, the method further includes:
and receiving PDCCH information according to the default PDCCH repeated transmission times.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, the default PDCCH retransmission times is sent to the terminal by the base station in advance through broadcast signaling.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, fig. 18 is a second schematic diagram of an information transmission apparatus provided in the embodiments of the present application, and as shown in fig. 18, the information transmission apparatus includes a determining module 1801 and a sending module 1802, where:
a determining module 1801, configured to determine, according to a current channel quality, indication information for repeated transmission of a physical downlink control channel PDCCH;
a sending module 1802, configured to send the PDCCH repeated transmission indication information to a terminal according to a default number of PDCCH repeated transmission times, so that the terminal receives PDCCH information according to the PDCCH repeated transmission indication information.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
It should be noted that, in the embodiment of the present application, the division of the unit/module is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by PDCCH, MAC CE, or RRC signaling.
Specifically, the information transmission apparatus provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.
Based on any of the above embodiments, the PDCCH repeated transmission indication information is carried by downlink control information DCI.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by the terminal; the ACK information is fed back by the terminal after the physical downlink shared channel PDSCH scheduled by the PDCCH is successfully demodulated;
and after delaying the preset time T, sending the PDCCH information to the terminal according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, when a physical uplink control channel PUCCH carrying the ACK information is not configured with a retransmission mechanism, the start time of T is a last OFDM symbol of a slot where the ACK information is located, or a first OFDM symbol of the slot where the ACK information is located, or a last OFDM symbol of OFDM symbols occupied by the ACK information, or a first OFDM symbol of OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after delaying the preset time T, sending PDCCH information to the terminal according to the PDCCH retransmission times indicated by the PDCCH retransmission indication information, specifically including:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and sending the PDCCH information to the terminal according to the m PDCCH MOs as a group.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving non-acknowledgement (NACK) information fed back by a terminal;
the NDI which is not overturned is sent to the terminal, and the PDCCH information is sent to the terminal according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
According to any of the above embodiments, the PDCCH repeated transmission indication information includes PDCCH repeated transmission times and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by a terminal;
and sending the PDCCH information to the terminal according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving a random access request sent by a terminal; the random access request is sent by the terminal when the counted number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold, wherein the preset threshold is configured through a high-level signaling or is a preset constant.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, after receiving the random access request sent by the terminal, the method further includes:
and sending PDCCH information to a terminal according to the default PDCCH repeated transmission times.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any of the above embodiments, before sending the PDCCH retransmission indication information to the terminal according to the default PDCCH retransmission times, the method further includes:
and sending the default PDCCH repeated transmission times to a terminal through broadcast signaling.
Specifically, the information transmission device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.
Based on any one of the foregoing embodiments, an embodiment of the present application further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, where the computer program is configured to cause the processor to execute the method provided in each of the foregoing embodiments, and the method includes:
receiving PDCCH repeated transmission indication information according to the number of times of the PDCCH repeated transmission of the default physical downlink control channel; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality; and receiving PDCCH information according to the PDCCH repeated transmission indication information.
Or comprises the following steps:
determining the repeated transmission indication information of a Physical Downlink Control Channel (PDCCH) according to the current channel quality; and sending the PDCCH repeated transmission indication information to the terminal according to the default PDCCH repeated transmission times so that the terminal can receive the PDCCH information according to the PDCCH repeated transmission indication information.
It should be noted that: the processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memories (NAND FLASH), solid State Disks (SSDs)), etc.
In addition, it should be noted that: in the embodiment of the present application, the term "and/or" describes an association relationship of associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.
The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, the applicable system may be a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) system, a long term evolution (long term evolution, LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, an LTE-a (long term evolution) system, a universal mobile system (universal mobile telecommunications system, UMTS), a universal internet Access (WiMAX) system, a New Radio Network (NR) system, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5 GS), and the like.
The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be called a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal device, e.g., a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN), and may exchange language and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an access point (access point), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), and a user device (user device), which is not limited in this embodiment.
The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for providing services to a terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames and Internet Protocol (IP) packets with one another as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communications network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB) or an e-NodeB) in a Long Term Evolution (LTE) System, a 5G Base Station (gNB) in a 5G network architecture (next generation System), a Home evolved Node B (HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico), and the like, which are not limited in the embodiments of the present application. In some network architectures, a network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.
Multiple Input Multiple Output (MIMO) transmission may be performed between the network device and the terminal device by using one or more antennas, where the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of root antenna combinations.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (41)
1. An information transmission method, comprising:
receiving PDCCH repeated transmission indication information according to the number of times of the PDCCH repeated transmission of the default physical downlink control channel; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality;
receiving PDCCH information according to the PDCCH repeated transmission indication information
The receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
after delaying a preset time T, receiving PDCCH information according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
when a Physical Uplink Control Channel (PUCCH) carrying the ACK information is not configured with a repeated transmission mechanism, the starting time of the T is the last Orthogonal Frequency Division Multiplexing (OFDM) symbol of a slot where the ACK information is located, or the first OFDM symbol of the slot where the ACK information is located, or the last OFDM symbol of the OFDM symbols occupied by the ACK information, or the first OFDM symbol of the OFDM symbols occupied by the ACK information;
when the PUCCH carrying the ACK information configures a repeat transmission mechanism, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
2. The information transmission method according to claim 1, wherein the PDCCH repeated transmission indication information is carried by PDCCH, medium access control element, MAC CE, or radio resource control, RRC, signaling.
3. The information transmission method according to claim 1, wherein the PDCCH repeated transmission indication information is carried by downlink control information, DCI.
4. The information transmission method according to claim 1, wherein after the delaying for a preset time period T, receiving PDCCH information according to the number of PDCCH retransmission times indicated by the PDCCH retransmission indication information specifically includes:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and receiving PDCCH information for a group according to the m PDCCH MOs.
5. The information transmission method according to claim 4, wherein the receiving PDCCH information for a group of m PDCCH MOs includes:
receiving PDCCH information by using PDCCH MOs in a group of PDCCH MOs one by one;
and if the PDCCH information is successfully demodulated by using the current kth PDCCH MO, the PDCCH information is not received by using the rest PDCCH MOs in the group, wherein k is less than m.
6. The information transmission method according to claim 1, wherein the PDCCH repetition transmission indication information includes a PDCCH repetition transmission number and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving an NDI which is sent by a base station and is not turned over; the non-flipped NDI is sent by the base station after receiving the non-acknowledgement NACK information;
receiving PDCCH information according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
7. The information transmission method according to claim 1, wherein the PDCCH repetition transmission indication information includes a PDCCH repetition transmission number and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving the turned NDI sent by the base station; the inverted NDI is sent by the base station after receiving the acknowledgement ACK message;
and receiving the PDCCH information according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
8. The information transmission method according to claim 1, wherein the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
receiving PDCCH information according to the PDCCH repeated transmission indication information;
counting the times of unsuccessfully receiving PDCCH information;
and if the number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold value, initiating random access to the base station, wherein the preset threshold value is configured through a high-level signaling or is a preset constant.
9. The information transmission method according to claim 8, wherein after the initiating the random access to the base station, the method further comprises:
and receiving PDCCH information according to the default PDCCH repeated transmission times.
10. The information transmission method according to claim 1 or 9, wherein the default number of PDCCH retransmission times is previously transmitted to the terminal by the base station through broadcast signaling.
11. An information transmission method, comprising:
determining repeated transmission indication information of a Physical Downlink Control Channel (PDCCH) according to the current channel quality;
sending the PDCCH repeated transmission indication information to a terminal according to the default PDCCH repeated transmission times so that the terminal can receive the PDCCH information according to the PDCCH repeated transmission indication information;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by the terminal; the ACK information is fed back by the terminal after the physical downlink shared channel PDSCH scheduled by the PDCCH is successfully demodulated;
after delaying a preset time length T, sending PDCCH information to a terminal according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
when a Physical Uplink Control Channel (PUCCH) carrying the ACK information is not configured with a repeated transmission mechanism, the starting time of the T is the last Orthogonal Frequency Division Multiplexing (OFDM) symbol of a slot where the ACK information is located, or the first OFDM symbol of the slot where the ACK information is located, or the last OFDM symbol of the OFDM symbols occupied by the ACK information, or the first OFDM symbol of the OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
12. The information transmission method according to claim 11, wherein the PDCCH repeated transmission indication information is carried by PDCCH, medium access control element, MAC CE, or radio resource control, RRC, signaling.
13. The information transmission method according to claim 11, wherein the PDCCH repeated transmission indication information is carried by downlink control information, DCI.
14. The information transmission method according to claim 11, wherein after the delaying for the preset time period T, the sending PDCCH information to the terminal according to the number of PDCCH retransmission times indicated by the PDCCH retransmission indication information specifically includes:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and sending the PDCCH information to the terminal according to the m PDCCH MOs as a group.
15. The information transmission method according to claim 11, wherein the PDCCH repetition transmission indication information includes a PDCCH repetition transmission number and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving non-acknowledgement (NACK) information fed back by a terminal;
the NDI which is not overturned is sent to the terminal, and the PDCCH information is sent to the terminal according to the number of times of repeated transmission of the old PDCCH; and the old PDCCH repeated transmission times are the PDCCH repeated transmission times configured for the terminal by the base station in the last PDCCH repeated transmission time adjusting period.
16. The information transmission method according to claim 11, wherein the PDCCH repetition transmission indication information includes a PDCCH repetition transmission number and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by the terminal;
and sending the PDCCH information to the terminal according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
17. The information transmission method according to claim 11, wherein after the sending the PDCCH repeated transmission indication information to the terminal, the method further comprises:
receiving a random access request sent by a terminal; the random access request is sent by the terminal when the counted number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold, wherein the preset threshold is configured through a high-level signaling or is a preset constant.
18. The information transmission method according to claim 17, wherein the receiving, after the random access request sent by the terminal, further comprises:
and sending PDCCH information to the terminal according to the default PDCCH repeated transmission times.
19. The information transmission method according to claim 11 or 18, wherein before the sending the PDCCH retransmission indication information to the terminal according to the default PDCCH retransmission number, the method further comprises:
and sending the default PDCCH repeated transmission times to a terminal through broadcast signaling.
20. A terminal comprising a memory, a transceiver, a processor;
a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following:
receiving PDCCH repeated transmission indication information according to the number of times of the PDCCH repeated transmission of the default physical downlink control channel; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality;
receiving PDCCH information according to the PDCCH repeated transmission indication information
The receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the Physical Downlink Shared Channel (PDSCH) scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
after delaying a preset time length T, receiving PDCCH information according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
when a Physical Uplink Control Channel (PUCCH) carrying the ACK information is not configured with a repeated transmission mechanism, the starting time of the T is the last Orthogonal Frequency Division Multiplexing (OFDM) symbol of a slot where the ACK information is located, or the first OFDM symbol of the slot where the ACK information is located, or the last OFDM symbol of the OFDM symbols occupied by the ACK information, or the first OFDM symbol of the OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
21. The terminal of claim 20, wherein the PDCCH repetition transmission indication information is carried by PDCCH, medium access control element, MAC CE, or radio resource control, RRC, signaling.
22. The terminal of claim 20, wherein the PDCCH repeated transmission indication information is carried by downlink control information, DCI.
23. The terminal according to claim 20, wherein after the delaying for the preset time period T, receiving PDCCH information according to the PDCCH retransmission times indicated by the PDCCH retransmission indication information specifically includes:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
receiving PDCCH information for a group according to the m PDCCH MOs.
24. The terminal of claim 23, wherein the receiving PDCCH information for a group of m PDCCH MOs includes:
receiving PDCCH information by using PDCCH MOs in a group of PDCCH MOs one by one;
and if the PDCCH information is successfully demodulated by using the current kth PDCCH MO, the PDCCH information is not received by using the rest PDCCH MOs in the group, wherein k is less than m.
25. The terminal of claim 20, wherein the PDCCH repetition transmission indication information comprises a PDCCH repetition transmission number and a new data indicator NDI;
the receiving of the PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving an NDI which is not overturned and sent by a base station; the non-flipped NDI is sent by the base station after receiving the non-acknowledgement NACK information;
receiving PDCCH information according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
26. The terminal of claim 20, wherein the PDCCH repetition transmission indication information comprises a PDCCH repetition transmission number and a new data indicator NDI;
the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
if the PDSCH scheduled by the PDCCH is successfully demodulated, feeding back Acknowledgement (ACK) information to the base station;
receiving the turned NDI sent by the base station; the inverted NDI is sent by the base station after receiving the acknowledgement ACK message;
and receiving the PDCCH information according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
27. The terminal according to claim 20, wherein the receiving PDCCH information according to the PDCCH repeated transmission indication information specifically includes:
receiving PDCCH information according to the PDCCH repeated transmission indication information;
counting the times of unsuccessfully receiving PDCCH information;
and if the number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold value, initiating random access to the base station, wherein the preset threshold value is configured through high-level signaling or is a preset constant.
28. The terminal of claim 27, wherein after initiating random access to the base station, the method further comprises:
and receiving PDCCH information according to the default PDCCH repeated transmission times.
29. The terminal of claim 20 or 28, wherein the default number of PDCCH retransmissions is sent to the terminal by the base station in advance through broadcast signaling.
30. A base station comprising a memory, a transceiver, a processor;
a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:
determining the repeated transmission indication information of a Physical Downlink Control Channel (PDCCH) according to the current channel quality;
sending the PDCCH repeated transmission indication information to a terminal according to the default PDCCH repeated transmission times so that the terminal can receive the PDCCH information according to the PDCCH repeated transmission indication information;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by the terminal; the ACK information is fed back by the terminal after the physical downlink shared channel PDSCH scheduled by the PDCCH is successfully demodulated;
after delaying a preset time length T, sending PDCCH information to a terminal according to the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
when a Physical Uplink Control Channel (PUCCH) carrying the ACK information is not configured with a repeated transmission mechanism, the starting time of the T is the last Orthogonal Frequency Division Multiplexing (OFDM) symbol of a slot where the ACK information is located, or the first OFDM symbol of the slot where the ACK information is located, or the last OFDM symbol of the OFDM symbols occupied by the ACK information, or the first OFDM symbol of the OFDM symbols occupied by the ACK information;
when a PUCCH configuration repeat transmission mechanism carrying the ACK information is used, the starting time of the T is the last OFDM symbol of the whole PUCCH repeat bundle or the first OFDM symbol of the whole PUCCH repeat bundle.
31. The base station of claim 30, wherein the PDCCH repetition transmission indication information is carried by PDCCH, medium access control element, MAC CE, or radio resource control, RRC, signaling.
32. The base station of claim 30, wherein the PDCCH repeated transmission indication information is carried by downlink control information, DCI.
33. The base station of claim 30, wherein after the delaying for the preset time period T, the sending of the PDCCH information to the terminal according to the PDCCH retransmission times indicated by the PDCCH retransmission indication information specifically includes:
dividing m PDCCH MOs into a group from the first PDCCH monitoring time MO after the T is delayed; m is the PDCCH repeated transmission times indicated by the PDCCH repeated transmission indication information;
and sending the PDCCH information to the terminal according to the m PDCCH MOs as a group.
34. The base station of claim 30, wherein the PDCCH repetition transmission indication information comprises PDCCH repetition transmission times and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving non-acknowledgement (NACK) information fed back by a terminal;
the NDI which is not overturned is sent to the terminal, and the PDCCH information is sent to the terminal according to the number of times of repeated transmission of the old PDCCH; and the number of the old PDCCH repeated transmission times is the number of the PDCCH repeated transmission times configured for the terminal in the last PDCCH repeated transmission time number adjusting period by the base station.
35. The base station of claim 30, wherein the PDCCH repetition transmission indication information comprises PDCCH repetition transmission times and a new data indicator NDI;
after the sending the PDCCH repeated transmission indication information to the terminal, the method further includes:
receiving ACK information fed back by a terminal;
and sending the PDCCH information to the terminal according to the PDCCH repeated transmission times contained in the PDCCH repeated transmission indication information.
36. The base station of claim 30, wherein after sending the PDCCH repeated transmission indication information to the terminal, the method further comprises:
receiving a random access request sent by a terminal; the random access request is sent by the terminal when the counted number of times of unsuccessfully receiving the PDCCH information exceeds a preset threshold, wherein the preset threshold is configured through a high-level signaling or is a preset constant.
37. The base station of claim 36, wherein after receiving the random access request sent by the terminal, the method further comprises:
and sending PDCCH information to the terminal according to the default PDCCH repeated transmission times.
38. The base station according to claim 30 or 37, wherein before sending the PDCCH retransmission indication information to the terminal according to the default PDCCH retransmission number, the base station further comprises:
and sending the default PDCCH repeated transmission times to a terminal through broadcast signaling.
39. An information transmission apparatus, comprising:
the first receiving module is used for receiving the physical downlink control channel PDCCH repeated transmission indication information according to the number of times of the physical downlink control channel PDCCH repeated transmission which is defaulted; the PDCCH repeated transmission indication information is determined by the base station according to the current channel quality;
and the second receiving module is used for receiving the PDCCH information according to the PDCCH repeated transmission indication information.
40. An information transmission apparatus, comprising:
the determining module is used for determining the repeated transmission indication information of the physical downlink control channel PDCCH according to the current channel quality;
and the sending module is used for sending the PDCCH repeated transmission indication information to the terminal according to the default PDCCH repeated transmission times so that the terminal can receive the PDCCH information according to the PDCCH repeated transmission indication information.
41. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to perform the method of any one of claims 1 to 19.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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CN202010777757.7A CN114070510B (en) | 2020-08-05 | 2020-08-05 | Information transmission method, device, terminal, base station and storage medium |
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