Method for transmitting structured information over a downlink prach

Abstract

The application discloses a method for transmitting structured information through a downlink PRACH, and relates to the technical field of wireless communication of 3GPP system, which comprises the following steps: generating structured information according to network configuration requirements, and encoding the structured information by using an improved structured root index mapping (SRIM) mechanism to obtain the root index of one or more Zadoff-Chu sequences; generating a corresponding Zadoff-Chu sequence by using the root index, embedding the sequence into PRACH time-frequency resources, and transmitting the sequence to a terminal device through a downlink; receiving a downlink PRACH preamble from a base station by the terminal device, identifying the root index of the Zadoff-Chu sequence in the preamble by using an optimized blind detection algorithm, extracting original structured information from the root index according to a preset SRIM decoding rule; and encoding the structured information into the root index of the Zadoff-Chu sequence by using the improved SRIM mechanism, embedding the root index into downlink PRACH time-frequency resources for transmission, and realizing efficient transmission of network configuration information without changing the physical layer structure.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology based on the 3GPP standard, and in particular to a method for transmitting structured information via downlink PRACH. Background Technology

[0002] 3GPP (3rd Generation Partnership Project) is a standards organization responsible for developing global mobile communication standards. Therefore, how to utilize advanced technologies to improve the intelligence and security of 3GPP-compliant wireless communications has become one of the most pressing issues to be addressed.

[0003] In the field of 3GPP wireless communication, when a high-orbit satellite is used as the master base station to communicate with a low-orbit satellite or low-altitude target using the 3GPP NTN standard, the periodically transmitted SSB signal and system broadcast messages are usually turned off due to power consumption and cost reasons. It is impossible to dynamically convey network parameter change instructions to the terminal in a conventional way. Furthermore, changes in the distance between high-orbit and low-orbit satellites will cause changes in propagation delay, and the selection of preset network parameter sets will change. Traditional synchronization mechanisms are difficult to adapt to such dynamic changes. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a method for transmitting structured information via downlink PRACH to address the problem that when a high-orbit satellite acts as the master base station and uses the 3GPP NTN standard to communicate with low-orbit satellites or low-altitude targets, due to power consumption and cost reasons, the periodically transmitted SSB signal and system broadcast messages are usually turned off. This makes it impossible to dynamically convey network parameter change instructions to the terminal in a conventional way. Furthermore, changes in the distance between high-orbit and low-orbit satellites will lead to changes in propagation delay, and the selection of preset network parameter sets will change. Traditional synchronization mechanisms are difficult to adapt to these dynamic changes.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a method for transmitting structured information via downlink PRACH, comprising:

[0008] Structured information is generated based on network configuration requirements, and the structured information is encoded using an improved structured root index mapping (SRIM) mechanism to obtain a root index of a Zadoff-Chu sequence.

[0009] The root index is used to generate the corresponding Zadoff-Chu sequence, which is then embedded into the PRACH time-frequency resource and sent to the terminal device via the downlink.

[0010] The terminal device receives the downlink PRACH preamble from the base station and uses an optimized blind detection algorithm to identify the Zadoff-Chu sequence root index in the preamble. According to the pre-set SRIM decoding rules, it extracts the original structured information from the root index.

[0011] The improved Structured Root Index Mapping (SRIM) mechanism includes:

[0012] A multidimensional mapping model is used to encode structured information, which includes change type and change value index.

[0013] Assign a specific weighting coefficient to each change type. Assign a specific weight coefficient to each changed value index. ;

[0014] Calculate the root index The formula is:

[0015] ;

[0016] in, Indicates the type of change. Indicates the index of the changed value;

[0017] The calculated root index As the basis for selecting the Zadoff-Chu sequence.

[0018] As a preferred embodiment of the method for transmitting structured information via downlink PRACH as described in this invention, the step of generating the corresponding Zadoff-Chu sequence using the root index and embedding it into the PRACH time-frequency resources includes:

[0019] Using root index Generate Zadoff-Chu sequences The expression is:

[0020] ;

[0021] in, For the root index, =839;

[0022] For the generated Zadoff-Chu sequence Power control processing is performed to adapt it to the transmission requirements of the satellite communication environment;

[0023] Insert a power-controlled Zadoff-Chu sequence into the selected PRACH time-frequency resource. This ensures that it can be correctly received by the terminal in the downlink.

[0024] As a preferred embodiment of the method for transmitting structured information via downlink PRACH as described in this invention, the step of extracting the original structured information from the root index according to a pre-defined SRIM decoding rule includes:

[0025] Use SRIM decoding rules to confirm the root index. Whether it is within the legal scope, i.e. ;

[0026] If the root index If it is valid, then according to the formula:

[0027] ;

[0028] Calculate the change type and change value index separately;

[0029] Based on the calculation results and the preset parameter update table, the specific network parameter changes are determined.

[0030] As a preferred embodiment of the method for transmitting structured information via downlink PRACH as described in this invention, the terminal performs corresponding operations based on the structured information, specifically including:

[0031] Based on the extracted change type and change value index, determine the specific operation instructions;

[0032] If the change type is GEO location information, then update the GEO location vector;

[0033] If the change type is a change to the pre-configured parameter set, then switch to the indicator parameter set;

[0034] If the change type is power control, then adjust the transmit power to the specified level;

[0035] After completing the operation, the terminal sends the execution result back to the base station via the uplink.

[0036] As a preferred embodiment of the method for transmitting structured information via downlink PRACH according to the present invention, the method further includes:

[0037] It supports an error retransmission mechanism. When the base station fails to receive subsequent uplink signals from the terminal device within a certain time window, it can repeatedly send the structured information to ensure the correct execution of the instructions.

[0038] In a second aspect, the present invention provides a computer device including a memory and a processor, the memory storing a computer program, wherein: when the computer program is executed by the processor, it implements any step of the method for transmitting structured information via downlink PRACH as described in the first aspect of the present invention.

[0039] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the method for transmitting structured information via downlink PRACH as described in the first aspect of the present invention.

[0040] The beneficial effects of this invention are as follows: By using the improved Structured Root Index Mapping (SRIM) mechanism, structured information is encoded into the root index of the Zadoff-Chu sequence and embedded into the downlink PRACH time-frequency resources for transmission. This achieves efficient transmission of network configuration information without changing the physical layer structure. The method utilizes a multi-dimensional mapping model and an optimized blind detection algorithm to improve the flexibility of information transmission and demodulation accuracy. It also supports power control and error retransmission mechanisms, enhancing adaptability and robustness in complex communication environments. Terminal devices can perform operations such as GEO position updates, parameter switching, and power adjustments based on the received information, and ensure closed-loop control of instruction execution through uplink feedback, thereby improving the dynamic configuration capability and operating efficiency of the overall communication system. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart of the method for transmitting structured information via downlink PRACH in Example 1.

[0043] Figure 2 This is a flowchart of the SRIM encoding process for the structured root index mapping in Example 1.

[0044] Figure 3 This is a schematic diagram of the dynamic PRACH resource selection mechanism in Example 1.

[0045] Figure 4 This is a schematic diagram of terminal blind detection and decoding in Example 1. Detailed Implementation

[0046] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0048] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0049] Example, refer to Figures 1-4 This embodiment of the invention provides a method for transmitting structured information via downlink PRACH, comprising the following steps:

[0050] S1. Generate structured information according to network configuration requirements, and encode the structured information using the improved Structured Root Index Mapping (SRIM) mechanism to obtain a root index of a Zadoff-Chu sequence;

[0051] Furthermore, the improved Structured Root Index Mapping (SRIM) mechanism includes:

[0052] A multidimensional mapping model is used to encode structured information, which includes change type and change value index.

[0053] Assign a specific weighting coefficient to each change type. Assign a specific weight coefficient to each changed value index. ;

[0054] Calculate the root index The formula is:

[0055] ;

[0056] in, Indicates the type of change. Indicates the index of the changed value;

[0057] The calculated root index As the basis for selecting the Zadoff-Chu sequence;

[0058] It should be noted that by adopting the improved Structured Root Index Mapping (SRIM) mechanism, the structured information is encoded into the root index of the Zadoff-Chu sequence, so that the PRACH preamble can not only be used for access but also carry multi-dimensional control information. The encoding method significantly improves the information transmission efficiency while maintaining compatibility with the existing Zadoff-Chu sequence generation mechanism. It does not require large-scale modifications to the physical layer and has good feasibility and scalability.

[0059] S3. Use the root index to generate the corresponding Zadoff-Chu sequence, embed the sequence into the PRACH time-frequency resource, and send it to the terminal device through the downlink;

[0060] Furthermore, using a root index Generate Zadoff-Chu sequences The expression is:

[0061] ;

[0062] in, For the root index, =839;

[0063] For the generated Zadoff-Chu sequence Power control processing is performed to adapt it to the transmission requirements of the satellite communication environment;

[0064] Insert a power-controlled Zadoff-Chu sequence into the selected PRACH time-frequency resource. This ensures that it can be correctly received by the terminal in the downlink;

[0065] It should be noted that by utilizing the excellent autocorrelation and low cross-correlation of the Zadoff-Chu sequence, combined with power control and resource insertion strategies, this invention ensures the detectability and robustness of the downlink PRACH preamble in complex satellite communication environments. By inserting the optimized Zadoff-Chu sequence into specific time-frequency resources, the base station can achieve efficient and low-power information transmission without increasing terminal complexity.

[0066] S4. The terminal device receives the downlink PRACH preamble from the base station and uses the optimized blind detection algorithm to identify the Zadoff-Chu sequence root index in the preamble. According to the pre-set SRIM decoding rules, it extracts the original structured information from the root index.

[0067] Furthermore, the received signal is transformed in the frequency domain using Fast Fourier Transform (FFT) to obtain a frequency domain representation.

[0068] Perform sliding correlation operations on the frequency domain representation to find the root index that best matches the preset Zadoff-Chu sequence. ;

[0069] Use SRIM decoding rules to confirm the root index. Whether it is within the legal scope, i.e. ;

[0070] If the root index If it is valid, then according to the formula:

[0071] ;

[0072] Calculate the change type and change value index separately;

[0073] Based on the calculation results and the preset parameter update table, the specific network parameter changes are determined.

[0074] It should be noted that by introducing an optimized blind detection algorithm based on FFT and sliding correlation techniques, and combining it with the SRIM decoding mechanism, the terminal can accurately identify the structured information in the downlink PRACH preamble under the influence of high-speed movement and Doppler frequency shift. The mechanism not only improves the detection accuracy and response speed of the receiver, but also enhances the fault tolerance of the system through the verification and retry mechanism, making it suitable for low-power, resource-constrained terminal devices.

[0075] S5. The terminal performs corresponding operations based on the structured information;

[0076] Furthermore, the terminal performs corresponding operations based on the structured information, specifically including:

[0077] Based on the extracted change type and change value index, determine the specific operation instructions;

[0078] If the change type is GEO location information, then update the GEO location vector;

[0079] If the change type is a change to the pre-configured parameter set, then switch to the indicator parameter set;

[0080] If the change type is power control, then adjust the transmit power to the specified level;

[0081] After completing the operation, the terminal sends the execution result back to the base station via the uplink;

[0082] It supports an error retransmission mechanism. When the base station fails to receive subsequent uplink signals from the terminal device within a certain time window, it can repeatedly send the structured information to ensure the correct execution of the instructions.

[0083] It should be noted that, through the terminal's rapid response to structured information and closed-loop feedback mechanism, this invention achieves real-time control and error recovery capabilities for network configuration changes. The base station can retransmit errors based on the feedback results, thereby improving system robustness and control accuracy. It is especially suitable for satellite communication scenarios that are sensitive to latency and have high reliability requirements.

[0084] This embodiment also provides a computer device applicable to the method of transmitting structured information via downlink PRACH, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the method of transmitting structured information via downlink PRACH as proposed in the above embodiment.

[0085] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0086] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the method for transmitting structured information via downlink PRACH as described in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0087] In summary, this invention, through an improved Structured Root Index Mapping (SRIM) mechanism, encodes structured information into root indices of the Zadoff-Chu sequence and embeds them into downlink PRACH time-frequency resources for transmission. This achieves efficient transmission of network configuration information without altering the physical layer structure. The method utilizes a multidimensional mapping model and an optimized blind detection algorithm to improve the flexibility and demodulation accuracy of information transmission. It also supports power control and error retransmission mechanisms, enhancing adaptability and robustness in complex communication environments. Terminal devices can perform GEO position updates, parameter switching, power adjustments, and other operations based on received information, and ensure closed-loop control of instruction execution through uplink feedback, thereby improving the dynamic configuration capability and operational efficiency of the overall communication system.

[0088] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for transmitting structured information via downlink PRACH, characterized in that: include: Structured information is generated based on network configuration requirements, and the structured information is encoded using an improved structured root index mapping (SRIM) mechanism to obtain a root index of a Zadoff-Chu sequence. The root index is used to generate the corresponding Zadoff-Chu sequence, which is then embedded into the PRACH time-frequency resource and sent to the terminal device via the downlink. The terminal device receives the downlink PRACH preamble from the base station and uses an optimized blind detection algorithm to identify the Zadoff-Chu sequence root index in the preamble. According to the pre-set SRIM decoding rules, it extracts the original structured information from the root index. The improved Structured Root Index Mapping (SRIM) mechanism includes: A multidimensional mapping model is used to encode structured information, which includes change type and change value index. Assign a specific weighting coefficient to each change type. Assign a specific weight coefficient to each changed value index. ; Calculate the root index The formula is: ； in, Indicates the type of change. Indicates the index of the changed value; The calculated root index As the basis for selecting the Zadoff-Chu sequence.

2. The method for transmitting structured information via downlink PRACH as described in claim 1, characterized in that: The step of generating the corresponding Zadoff-Chu sequence using the root index and embedding it into the PRACH time-frequency resource includes: Using root index Generate Zadoff-Chu sequences The expression is: ； in, For the root index, =839; For the generated Zadoff-Chu sequence Power control processing is performed to adapt it to the transmission requirements of the satellite communication environment; Insert a power-controlled Zadoff-Chu sequence into the selected PRACH time-frequency resource. This ensures that it can be correctly received by the terminal in the downlink.

3. The method for transmitting structured information via downlink PRACH as described in claim 2, characterized in that: The step of extracting the original structured information from the root index according to the pre-set SRIM decoding rules includes: Use SRIM decoding rules to confirm the root index. Whether it is within the legal scope, i.e. ; If the root index If it is valid, then according to the formula: ； Calculate the change type and change value index separately; Based on the calculation results and the preset parameter update table, the specific network parameter changes are determined.

4. The method for transmitting structured information via downlink PRACH as described in claim 3, characterized in that: The terminal performs corresponding operations based on the structured information, specifically including: Based on the extracted change type and change value index, determine the specific operation instructions; If the change type is GEO location information, then update the GEO location vector; If the change type is a change to the pre-configured parameter set, then switch to the indicator parameter set; If the change type is power control, then adjust the transmit power to the specified level; After completing the operation, the terminal sends the execution result back to the base station via the uplink.

5. The method for transmitting structured information via downlink PRACH as described in claim 4, characterized in that: The method further includes: It supports an error retransmission mechanism. When the base station fails to receive subsequent uplink signals from the terminal device within a certain time window, it can repeatedly send the structured information to ensure the correct execution of the instructions.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the method for transmitting structured information via downlink PRACH as described in any one of claims 1 to 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the method for transmitting structured information via downlink PRACH as described in any one of claims 1 to 5.

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