Search

CN-120856274-B - Method for transmitting structured information through downlink PRACH

CN120856274BCN 120856274 BCN120856274 BCN 120856274BCN-120856274-B

Abstract

The invention discloses a method for transmitting structured information through a downlink PRACH, which relates to the technical field of wireless communication of 3GPP systems and comprises the steps of generating structured information according to network configuration requirements, adopting an improved structured root index mapping SRIM mechanism to encode the structured information to obtain root indexes of one or more Zadoff-Chu sequences, generating corresponding Zadoff-Chu sequences by using the root indexes, embedding the corresponding Zadoff-Chu sequences into PRACH time-frequency resources, transmitting the sequences to terminal equipment through a downlink, receiving a downlink PRACH leading code from a base station by the terminal equipment, utilizing an optimized blind detection algorithm to identify a Zadoff-Chu sequence root index in the leading code, 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 sequences by the improved structured root index mapping SRIM mechanism and transmitting the root index into the downlink PRACH time-frequency resources, thereby realizing efficient network configuration information transmission without changing a physical layer structure.

Inventors

  • Request for anonymity
  • YAO JINSONG
  • FU XIAO
  • LIU GANG
  • ZHANG ZHIGANG

Assignees

  • 星际数链(北京)科技有限公司

Dates

Publication Date
20260508
Application Date
20250807

Claims (7)

  1. 1. The method for transmitting the structured information through the downlink PRACH is characterized by comprising the following steps: generating structured information according to network configuration requirements, and coding the structured information by adopting an improved structured root index mapping SRIM mechanism to obtain a root index of a Zadoff-Chu sequence; Generating a corresponding Zadoff-Chu sequence by using a root index, embedding the sequence into PRACH time-frequency resources, and transmitting the sequence to terminal equipment through a downlink; the terminal equipment receives a downlink PRACH preamble from a base station, identifies a Zadoff-Chu sequence root index in the preamble by using an optimized blind detection algorithm, and extracts original structured information from the root index according to a preset SRIM decoding rule; The improved structured root index mapping SRIM mechanism includes: encoding the structured information by adopting a multi-dimensional mapping model, wherein the multi-dimensional mapping model comprises a change type and a change value index; Assigning a specific weight coefficient to each change type Each change value index is assigned a specific weight coefficient ; Computing root index The formula is: ; Wherein, the Indicating the type of change that is to be made, Representing a change value index; Indexing the computed root As a selection basis for Zadoff-Chu sequences.
  2. 2. The method for transmitting structured information via downlink PRACH of claim 1, wherein generating and embedding a corresponding Zadoff-Chu sequence into PRACH time-frequency resources using a root index comprises: Employing root index Generation of Zadoff-Chu sequences The expression is: ; Wherein, the For the root index to be used, =839; For the generated Zadoff-Chu sequence Performing power control processing to adapt to transmission requirements in a satellite communication environment; inserting power-controlled Zadoff-Chu sequences in selected PRACH time-frequency resources Ensuring that it is correctly received by the terminal in the downlink.
  3. 3. The method for transmitting structured information via downlink PRACH according to claim 2, wherein extracting the original structured information from the root index according to the predetermined SRIM decoding rule comprises: confirming root index by adopting SRIM decoding rule Whether or not it is within legal range, i.e ; If root index Legal, then according to the formula: ; Respectively calculating a change type and a change value index; and according to the calculation result, combining a preset parameter updating table to determine specific network parameter changing contents.
  4. 4. The method for transmitting structured information through downlink PRACH according to claim 3, wherein the terminal performs corresponding operations according to the structured information, specifically comprising: Determining a specific operation instruction according to the extracted change type and change value index; If the change type is GEO position information, updating the GEO position vector; if the change type is the change of the pre-configured parameter set, switching to the indication parameter set; If the change type is power control, adjusting the transmitting power to a specified level; after the operation is completed, the terminal feeds back the execution result to the base station through the uplink.
  5. 5. The method for communicating structured information via a downlink PRACH of claim 4, wherein the method further comprises: And supporting an error retransmission mechanism, wherein when the base station does not receive the subsequent uplink signals of the terminal equipment within a certain time window, the structural information can be repeatedly sent for a plurality of times, so that the correct execution of the instruction is ensured.
  6. 6. A computer device comprising a memory and a processor, said memory storing a computer program, characterized in that the processor, when executing said computer program, implements the steps of the method for delivering structured information via downlink PRACH as claimed in any one of claims 1 to 5.
  7. 7. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method for delivering structured information via a downlink PRACH as claimed in any one of claims 1 to 5.

Description

Method for transmitting structured information through downlink PRACH Technical Field The invention relates to the technical field of wireless communication in a 3GPP system, in particular to a method for transmitting structured information through a downlink PRACH. Background The 3GPP (third generation partnership project) is a standardization organization responsible for developing global mobile communications standards. Therefore, how to improve the intelligent level and the security of the wireless communication in the 3GPP system by using advanced technical means is one of the problems to be solved currently. In the field of wireless communication in 3GPP standard, when a high-orbit satellite is used as a master base station to communicate with a low-orbit satellite or a low-altitude target in 3GPP NTN standard, due to power consumption and cost, SSB signals and system broadcast messages that are periodically transmitted are usually turned off, a network parameter change instruction cannot be dynamically transmitted to a terminal in a conventional manner, a change in a distance between the high-orbit satellite and the low-orbit satellite causes a change in propagation delay, and a preset network parameter set selection is changed, so that a conventional synchronization mechanism is difficult to adapt to the dynamic change. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the present invention provides a method for transmitting structured information through downlink PRACH, which solves the problems that when a high orbit satellite is used as a master base station and adopts a 3GPP NTN system to communicate with a low orbit satellite or a low altitude target, due to power consumption and cost, a periodically transmitted SSB signal and a system broadcast message are usually closed, a network parameter change instruction cannot be dynamically transmitted to a terminal in a conventional manner, a change in a distance between the high orbit satellite and the low orbit satellite causes a change in propagation delay, a preset network parameter set selection is changed, and a conventional synchronization mechanism is difficult to adapt to the dynamic change. In order to solve the technical problems, the invention provides the following technical scheme: in a first aspect, the present invention provides a method for delivering structured information via a downlink PRACH, comprising: generating structured information according to network configuration requirements, and coding the structured information by adopting an improved structured root index mapping SRIM mechanism to obtain a root index of a Zadoff-Chu sequence; Generating a corresponding Zadoff-Chu sequence by using a root index, embedding the sequence into PRACH time-frequency resources, and transmitting the sequence to terminal equipment through a downlink; the terminal equipment receives a downlink PRACH preamble from a base station, identifies a Zadoff-Chu sequence root index in the preamble by using an optimized blind detection algorithm, and extracts original structured information from the root index according to a preset SRIM decoding rule; The improved structured root index mapping SRIM mechanism includes: encoding the structured information by adopting a multi-dimensional mapping model, wherein the multi-dimensional mapping model comprises a change type and a change value index; Assigning a specific weight coefficient to each change type Each change value index is assigned a specific weight coefficient; Computing root indexThe formula is: ; Wherein, the Indicating the type of change that is to be made,Representing a change value index; Indexing the computed root As a selection basis for Zadoff-Chu sequences. The method for transmitting structured information through downlink PRACH according to the present invention is characterized in that the generating a corresponding Zadoff-Chu sequence using a root index and embedding the Zadoff-Chu sequence into PRACH time-frequency resources comprises: Employing root index Generation of Zadoff-Chu sequencesThe expression is: ; Wherein, the For the root index to be used, =839; For the generated Zadoff-Chu sequencePerforming power control processing to adapt to transmission requirements in a satellite communication environment; inserting power-controlled Zadoff-Chu sequences in selected PRACH time-frequency resources Ensuring that it is correctly received by the terminal in the downlink. The method for transmitting structured information through downlink PRACH according to the present invention is a preferable scheme, wherein the extracting the original structured information from the root index according to the preset SRIM decoding rule comprises: confirming root index by adopting SRIM decoding rule Whether or not it is within legal range, i.e; If root indexLegal, then according to the formula: ; Respectively calcula