CN114710806A - Low-delay transmission method and device for control command - Google Patents
Low-delay transmission method and device for control command Download PDFInfo
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- CN114710806A CN114710806A CN202210404133.XA CN202210404133A CN114710806A CN 114710806 A CN114710806 A CN 114710806A CN 202210404133 A CN202210404133 A CN 202210404133A CN 114710806 A CN114710806 A CN 114710806A
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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
- H04W28/0273—Traffic management, e.g. flow control or congestion control adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a low-delay transmission method of a control command, which comprises the following steps: step one, NR receives a URLLC service data packet, processes the URLLC service data packet and then sends the URLLC service data packet to UE; step two, the UE receives URLLC service data and makes data receiving preparation according to the service information; step three, the UE continuously receives the data signals and performs joint decoding on the received data signals; step four, the UE returns a decoding result to the NR; and step five, after receiving the decoding result, the NR reports the decoding result to an upper layer by the physical layer. The invention has the beneficial effects that: the transmission method for controlling the command low delay transmits the data by adopting a semi-dynamic transmission mode, and jointly decodes the data packets of different time nodes by adopting a joint decoding mode, thereby improving the transmission efficiency, ensuring the transmission reliability and solving the problems of data delay and service conflict in the prior art.
Description
Technical Field
The invention relates to the technical field of data transmission, in particular to a low-delay transmission method and device for a control command.
Background
With the development and progress of the technology, the 5g technology is gradually integrated into various fields of production and life of people, and in order to improve the working performance of a power station, the 5g technology is also introduced into the photovoltaic power station. Data transmission between NR and UE in the photovoltaic power station has higher requirements on time delay and reliability.
In the existing transmission mode, NR needs to reserve enough resources for each CPE, and the burstiness of the control command increases the frequency of NR reserved resources, so that the utilization rate of NR resources is not high, and the requirement of low delay cannot be better satisfied. In addition, the UE needs to transmit eMBB-type service data and control command data with URLLC characteristics, and the burstiness of the two service data often causes the UE to process the two service data simultaneously, which causes a large burden on the UE.
Disclosure of Invention
The present invention provides a method and an apparatus for transmitting a control command with low latency, which are directed to the problems in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a control command low-delay transmission method comprises the following steps:
step one, NR receives a URLLC service data packet, processes the URLLC service data packet and then sends the URLLC service data packet to UE;
step two, the UE receives URLLC service data and makes data receiving preparation according to the service information;
step three, the UE continuously receives the data signals and performs joint decoding on the received data signals;
step four, the UE returns a decoding result to the NR;
and step five, after receiving the decoding result, the NR reports the decoding result to an upper layer by the physical layer.
Further, in the first step, the URLLC service data packet is processed to generate a PDCCH signaling, and a certain number of HARQ data packets are generated according to the physical layer high-level configuration requirement.
Further, the PDCCH signaling carries a URLLC service type indication, a semi-dynamic transmission indication, and frequency domain resources of a URLLC service, and the HARQ data includes PDSCH signaling and corresponding DM _ RS information.
Further, the PDCCH signaling carries frequency domain resources sent by a data packet, and the HARQ data packet carries PDSCH signaling and corresponding DM _ RS information.
Further, in the first step, the URLLC service data packet is processed, the physical layer demodulates the PDSCH using the dedicated DM _ RS for the URLLC service configured by NR, the physical layer high-level configuration requires to generate a certain number of HARQ data packets, the HARQ data packets are generated according to the requirements, and the PDSCH and the corresponding DM _ RS information are mapped to the frequency domain resource set configured by the high-level.
Further, in the second step, after receiving the PDCCH signaling and decoding and analyzing the PDCCH signaling, the UE learns that the subsequent HARQ packet is semi-dynamically scheduled, and the UE is ready for data reception.
Further, in the second step, after receiving the PDCCH signaling and the HARQ data packet and performing decoding analysis on the PDCCH signaling and the HARQ data packet, the UE learns the frequency domain resource occupied by the URLLC service data and learns that the DM _ RS is the dedicated DM _ RS for the URLLC service, and determines that the HARQ data packet of the subsequent time slot is semi-dynamically scheduled according to the configuration of the high layer.
Further, in the second step, after receiving the DM _ RS, the UE learns that the HARQ is dedicated DM _ RS for URLLC service, and learns that the subsequent HARQ packet is semi-dynamically scheduled according to the frequency domain resource configured by the higher layer.
Further, the versions of the data packets received by the UE in the third step may be the same or different for each slot or subframe transmission.
A control command transmission device comprises a core network device, wherein the core network device is connected with a plurality of access devices, each access device is connected with a plurality of clients, the core network sends new service information to the access devices, the access devices send the information to the clients in a semi-dynamic sending mode, and the clients receive the information and make feedback.
The invention has the beneficial effects that: the transmission method for controlling the command with low delay transmits the data by adopting a semi-dynamic transmission mode, and jointly decodes the data packets of different time nodes by adopting a joint decoding mode, thereby improving the transmission efficiency, ensuring the transmission reliability and solving the problems of data delay and service conflict in the prior art.
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FIG. 1 is a flowchart illustrating a low latency control command transmission method according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
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 invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
As used herein, a "module," "system," and the like are intended to refer to a computer-related entity, either hardware, a combination of hardware and software, or software in execution. In particular, for example, an element may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. Also, an application or script running on a server, or a server, may be an element. One or more elements may be in a process and/or thread of execution and an element may be localized on one computer and/or distributed between two or more computers and may be operated by various computer-readable media. The elements may also communicate by way of local and/or remote processes based on a signal having one or more data packets, e.g., from a data packet interacting with another element in a local system, distributed system, and/or across a network in the internet with other systems by way of the signal.
Finally, it should be further noted that the terms "comprises" and "comprising," when used herein, include not only those elements but also other elements not expressly listed or inherent to such processes, methods, articles, or devices. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Example 1
It should be noted that, after the UE enters the RRC-Connected state, the content of the NR in the resource configuration information for the UE includes the following physical layer transmission information, where the information content specifically includes: (1) a downlink air interface physical layer signaling search space required by the URLLC service; (2) the number of continuously scheduled sub-frames or time slots or symbols; (3) whether the UE feeds back ACK after receiving the ACK or not and whether the UE feeds back NACK after receiving the ACK or not; (4) the format of DM-RS corresponding to URLLC service; (5) whether the HARQ process with the low priority can be preempted or any one or more of the number of the HARQ process which can be preempted and cleared.
Referring to fig. 1, a method for transmitting a control command with low latency provided by the present invention includes:
step one, NR receives a URLLC service data packet, processes the URLLC service data packet and then sends the URLLC service data packet to UE;
step two, the UE receives URLLC service data and makes data receiving preparation according to the service information;
step three, the UE continuously receives the data signals and performs joint decoding on the received data signals;
step four, the UE returns a decoding result to the NR;
and step five, after receiving the decoding result, the NR reports the decoding result to an upper layer by the physical layer.
After receiving the URLLC service data packet in the first step, the NR generates PDCCH signaling by the physical layer through the processing of SDAP/PDCP/RLC/MAC. The physical layer high layer configuration requires to generate a certain number of HARQ data packets, and the generation of the HARQ data packets is carried out according to the requirement.
In this embodiment, the physical layer higher layer configuration requires that three HARQ packets be generated, and the generation of the three HARQ packets is performed by using a coding redundancy scheme.
In this embodiment, the PDCCH signaling carries a URLLC service type indication, a semi-dynamic sending indication, and a frequency domain resource of the URLLC service. The time slot or subframe corresponding to the HARQ data packet no longer carries PDCCH signaling content, and only contains PDSCH signaling and corresponding DM _ RS information.
And in the second step, the UE receives and decodes the PDCCH signaling, and after decoding and analysis, the UE knows that the three follow-up HARQ data packets are prepared for data reception after semi-dynamic scheduling. The specific treatment process is as follows:
and in the T0 time slot, the UE receives and decodes the PDCCH signaling, and after decoding, the UE obtains any one of URLLC service indication, semi-dynamic sending indication, subsequent continuous transmission time slot or subframe number carried by the PDCCH signaling. The UE determines that the subsequent slot sub-frame is a hybrid redundant transmission of the MAC layer packet based on the information, and the UE is ready to receive subsequent data, such as storage space, decoder, etc.
Wherein the UE receives PDSCH signals of T0, T1, T2 slots or subframes consecutively and sequentially in step three. The versions of the data packets transmitted in the above time slots or subframes may be the same or different, and the data receiving and processing process is as follows:
the UE firstly receives a PDSCH signal corresponding to the T0 time slot, decodes the signal, performs CRC after the decoding is finished, sends the data packet to an MAC layer if the CRC is correct, and waits for the PDSCH signal corresponding to the T1 time slot or the subframe if the CRC is wrong.
And after receiving the PDSCH signal corresponding to the T1 time slot or the subframe, the UE performs joint decoding on the PDSCH signal corresponding to the T1 time slot or the subframe and the PDSCH signal corresponding to the T0 time slot, performs CRC check after joint decoding, sends the data packet to an MAC layer if the CRC check is correct, and continues to wait for the PDSCH signal corresponding to the T2 time slot if the CRC check is wrong.
And after receiving the PDSCH signal corresponding to the T2 time slot, the UE performs joint decoding on the PDSCH signal corresponding to the T2 time slot, the PDSCH signal corresponding to the T1 time slot or the subframe, and the PDSCH signal corresponding to the T0 time slot, performs CRC check after joint decoding, sends the data packet to an MAC layer if the CRC check is correct, and fails to receive the semi-dynamic scheduling if the CRC check is still wrong.
By analogy, the UE may continuously receive a plurality of data packets for joint decoding, and the number of the data packets is determined according to actual needs, which is not limited herein.
In the fourth step, when the semi-dynamic scheduling reception is successful, if the FDD transmission mode is adopted, the UE feeds back the ACK signal to the NR at the T3 timeslot or subframe, and if the TDD transmission mode is adopted, the UE feeds back the ACK signal to the NR at the first uplink timeslot after the end of the continuous downlink transmission. When the semi-dynamic scheduling fails to receive, the UE sends a NACK signal to the NR at the time node or does not perform feedback according to the configuration of the RRC.
In the fifth step, the NR starts to receive an ACK or NACK signal of the UE at a time slot T3, and when the NR receives the ACK signal, which indicates that data transmission is successful, the physical layer reports to the upper layer that the data packet is successfully transmitted; when the NR receives the NACK signal or does not receive any signal, it indicates that data transmission has failed, and the physical layer reports the failure of data packet transmission to the upper layer. And after the transmission fails, if the configuration information of the NR shows that the data packet needs to be subjected to semi-dynamic scheduling again, repeating the process, and if the configuration information of the NR does not require, finishing the transmission.
Example 2
After receiving the URLLC service data packets in the first step, NR generates PDCCH signaling through SDAP/PDCP/RLC/MAC processing, a physical layer configures a certain number of HARQ data packets required to be generated by a physical layer high-level configuration, the HARQ data packets are generated according to the requirement, and in the process, NR configured dedicated DM _ RS for the URLLC service is used when PDSCH demodulates required DM-RS.
In this embodiment, the PDCCH signaling carries frequency domain resources sent by a data packet, and a time slot or a subframe corresponding to the HARQ data packet only carries PDSCH signaling and corresponding DM _ RS information, and does not carry PDCCH signaling content any more.
In the second step, the UE receives the PDCCH signaling and the HARQ data packet, decodes and analyzes the PDCCH signaling and the HARQ data packet to acquire the frequency domain resource occupied by the URLLC service data and the DM _ RS special for the URLLC service, and determines that the HARQ data packet of the subsequent time slot is semi-dynamic scheduling according to the configuration of the high layer. The specific process is as follows:
in a T0 timeslot, the UE receives the PDCCH and the DM _ RS, acquires the frequency domain resource occupied by the URLLC service data according to the PDCCH, and determines the number of subsequent continuous transmission timeslots or subframes according to the format of the DM _ RS, for example: DM _ RS format 1 is transmitted 3 times continuously, RV version is 1, 4, 2, DM _ RS format 2 is transmitted 4 times continuously, RV version is 1, 3, 2, 4. The UE determines that the subsequent time slot or sub-frame is a hybrid redundancy transmission of a MAC layer packet according to the above, and prepares corresponding resources, such as a storage space, a decoder, etc., accordingly.
Example 3
After receiving the URLLC service data packet in step one, NR demodulates PDSCH by using dedicated DM _ RS for URLLC service configured by NR through SDAP/PDCP/RLC/MAC processing, and the physical layer configures a certain number of HARQ data packets, and generates HARQ data packets according to the requirement. And the PDSCH and the corresponding DM _ RS information are mapped to a frequency domain resource set configured by a higher layer.
In the second step, after receiving the DM _ RS, the UE learns that the DM _ RS is dedicated for the URLLC service, and learns that the subsequent HARQ packet is semi-dynamically scheduled according to the frequency domain resource configured by the higher layer, which includes the following specific processes: in the T0 slot, the UE receives the DM _ RS, determines the format of the DM _ RS, and determines the number of subsequent consecutive transmission slots or subframes according to the received DM _ RS, for example, DM _ RS format 1 is consecutive transmission 3 times, RV version is 1, 4, 2, DM _ RS format 2 is consecutive transmission 4 times, RV version is 1, 3, 2, 4. The UE determines that the sub-frame of the subsequent time slot is a mixed redundancy transmission of one MAC layer data packet according to the contents. The resources required by the HARQ process that the UE is ready to receive these data, e.g. memory space, decoders, etc.
A control command transmitting apparatus, characterized in that: the core network equipment is connected with a plurality of access equipment, each access equipment is connected with a plurality of clients, the core network sends new service information to the access equipment, the access equipment sends the information to the clients in a semi-dynamic sending mode, and the clients receive the information and make feedback.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.
Claims (10)
1. A method for transmitting control commands with low delay time is characterized by comprising the following steps:
step one, NR receives a URLLC service data packet, processes the URLLC service data packet and then sends the URLLC service data packet to UE;
step two, the UE receives URLLC service data and makes data receiving preparation according to the service information;
step three, the UE continuously receives the data signals and performs joint decoding on the received data signals;
step four, the UE returns a decoding result to the NR;
and step five, after receiving the decoding result, the NR reports the decoding result to an upper layer by the physical layer.
2. The method for transmitting control commands with low latency according to claim 1, wherein: in the first step, the URLLC service data packet is processed to generate a PDCCH signaling, and a certain number of HARQ data packets are generated according to the configuration requirement of a physical layer high layer.
3. The method for transmitting control commands with low latency according to claim 2, wherein: the PDCCH signaling carries URLLC service type indication, semi-dynamic sending indication and frequency domain resources of URLLC service, and the HARQ data comprises PDSCH signaling and corresponding DM _ RS information.
4. The method for transmitting control commands with low latency according to claim 2, wherein: the PDCCH signaling carries frequency domain resources sent by a data packet, and the HARQ data packet carries PDSCH signaling and corresponding DM _ RS information.
5. The method for transmitting control commands with low latency according to claim 1, wherein: processing the URLLC service data packet in the first step, demodulating the PDSCH by using dedicated DM _ RS of the URLLC service configured by NR in a physical layer, generating a certain number of HARQ data packets according to the requirement of physical layer high-level configuration, generating the HARQ data packets according to the requirement, and mapping the PDSCH and corresponding DM _ RS information into a frequency domain resource set configured by a high level.
6. The method for transmitting control commands with low latency according to claim 3, wherein: in the second step, after receiving the PDCCH signaling and decoding and analyzing the PDCCH signaling, the UE learns that the subsequent HARQ data packet is semi-dynamically scheduled, and the UE prepares for data reception.
7. The method for transmitting control commands with low latency according to claim 4, wherein: in the second step, after receiving the PDCCH signaling and the HARQ data packet and decoding and analyzing the PDCCH signaling and the HARQ data packet, the UE learns the frequency domain resource occupied by the URLLC service data and learns that the DM _ RS is a dedicated DM _ RS for the URLLC service, and determines that the HARQ data packet of the subsequent time slot is semi-dynamically scheduled according to the configuration of the high layer.
8. The method for low latency transfer of control commands according to claim 5, wherein: and in the second step, after receiving the DM _ RS, the UE learns that the DM _ RS is the dedicated DM _ RS for the URLLC service, and learns that the subsequent HARQ data packet is semi-dynamically scheduled according to the frequency domain resource configured by the high layer.
9. The method for transmitting control commands with low latency according to claim 5, wherein: the versions of the data packets received by the UE in the third step may be the same or different for each slot or subframe transmission.
10. A control command transmitting apparatus, characterized in that: the core network equipment is connected with a plurality of access equipment, each access equipment is connected with a plurality of clients, the core network sends new service information to the access equipment, the access equipment sends the information to the clients in a semi-dynamic sending mode, and the clients receive the information and make feedback.
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