Adaptive transmission system and method for low-orbit satellite and low-resource satellite-ground layered decision making

Abstract

The present invention discloses an adaptive transmission system and method for low-orbit satellite and low-resource satellite-ground layered decision-making, which belongs to the field of satellite communication adaptive transmission. The present invention includes a satellite base station and a ground terminal; the satellite base station includes a satellite network control, satellite interaction, a satellite modulator and a satellite demodulator; the ground terminal includes a modulator, a demodulator and an access controller; the ground terminal sends uplink status application information to the satellite base station, calculates the smoothed signal-to-noise ratio based on the uplink status information fed back by the satellite base station, and uploads it to the satellite base station. The satellite base station selects the corresponding carrier rate and allocates it to the ground terminal based on the remaining carrier resource situation and the smoothed signal-to-noise ratio reported by the ground terminal. The ground terminal adjusts the modulation and coding method for sending the uplink analog signal based on the carrier rate allocated by the satellite base station. The present invention unloads the large amount of data processed by the satellite base station to each ground terminal, realizes distributed processing, and improves the adaptive transmission processing capability of the entire system.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication adaptive transmission, and in particular to an adaptive transmission system and method for low-orbit satellite and low-resource satellite-ground hierarchical decision-making. Background Art

[0002] Low-Earth Orbit (LEO) satellite communications have the following characteristics: satellite motion causes the distance between the satellite and the ground to constantly change; the large satellite field of view results in varying weather conditions in different regions, leading to varying satellite link losses; and satellites need to support large and small stations, each with varying link capabilities. To fully utilize link power, LEO satellites must collect real-time statistics on uplink status for each terminal, making decisions about carrier, modulation, and coding, and adapting carrier capacity to link capacity. Since the onboard base station needs to estimate the link status for each terminal in real time, involving many terminals and generating large amounts of data, this conflicts with the limited processing power of the onboard base station. Summary of the Invention

[0003] In light of this, the present invention proposes an adaptive transmission system and method for low-orbit satellite-based, low-resource, satellite-ground layered decision-making. This invention offloads the large amounts of data processed by satellite-based base stations to individual ground terminals, enabling distributed processing and improving the adaptive transmission processing capabilities of the entire system.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] An adaptive transmission system for low-orbit satellite-to-ground layered decision-making with low resources, including satellite-based base stations and ground terminals;

[0006] The satellite-borne base station includes a satellite network control, a satellite switching, a satellite modulator, and a satellite demodulator. The satellite network control selects the corresponding carrier rate and allocates it to the ground terminal based on the remaining carrier resources and the smoothed signal-to-noise ratio reported by the ground terminal, and generates a link layer frame. The satellite switching implements information exchange between the satellite modulator, the satellite demodulator, and the satellite network control. The satellite modulator encodes and modulates the link layer frame generated by the satellite demodulator and the satellite network control into a downlink analog signal for transmission. The satellite demodulator can demodulate multiple carriers of different rates, estimate the uplink carrier signal-to-noise ratio corresponding to each carrier, and generate a link layer frame.

[0007] The ground terminal includes a modulator, a demodulator and an access controller; the modulator codes and modulates the link layer frame generated by the access controller into an uplink analog signal for transmission; the demodulator can demodulate the downlink analog signal and generate a link layer frame for transmission to the access controller; the access controller can generate link layer frames, cache multiple uplink carrier signal-to-noise ratios and calculate the smoothed signal-to-noise ratio, and can also adjust the modulation and coding method for sending the uplink analog signal based on the smoothed signal-to-noise ratio and the carrier rate allocated by the onboard network control.

[0008] The adaptive transmission method for low-orbit satellite low-resource satellite-ground layered decision-making is implemented based on the adaptive transmission system for low-orbit satellite low-resource satellite-ground layered decision-making as described above, and specifically includes the following steps:

[0009] Step 1: The access controller of the ground terminal continuously generates uplink state application information and sends it to the modulator. The modulator modulates the uplink state application information into an uplink analog signal and sends it to the satellite base station.

[0010] Wherein, the uplink status application information includes the device ID of the ground terminal;

[0011] Step 2: After receiving the uplink analog signal, the onboard demodulator demodulates it, extracts the uplink status request information, estimates the uplink carrier signal-to-noise ratio corresponding to the uplink analog signal, and generates uplink status information based on the uplink carrier signal-to-noise ratio. The onboard demodulator transmits the uplink status information to the onboard modulator through onboard switching. The onboard modulator modulates the uplink status information into a downlink analog signal and sends it to the ground terminal.

[0012] Step 3: The demodulator of the ground terminal demodulates the downlink analog signal, extracts the uplink state information and transmits it to the access controller, which obtains the uplink carrier signal-to-noise ratio based on the uplink state information.

[0013] Step 4: The access controller continuously caches the latest multiple uplink carrier signal-to-noise ratios, records the average of the multiple uplink carrier signal-to-noise ratios as the smoothed signal-to-noise ratio, and generates a satellite network control reporting frame based on the smoothed signal-to-noise ratio and transmits it to the modulator. The modulator modulates the satellite network control reporting frame into an uplink analog signal and sends it to the satellite base station.

[0014] Step 5: After receiving the uplink analog signal, the onboard demodulator demodulates it, extracts the onboard network control reporting frame, and transmits the onboard network control reporting frame to the onboard network control through onboard switching;

[0015] Step 6: The onboard network control selects the corresponding carrier rate and allocates it to the ground terminal based on the remaining carrier resources and the smoothed signal-to-noise ratio in the onboard network control report frame. The onboard network control generates a frame plan based on the carrier rate. The onboard network control transmits the frame plan to the onboard modulator through onboard switching. The onboard modulator modulates the frame plan into a downlink analog signal and sends it to the ground terminal.

[0016] In step 7, the demodulator of the ground terminal demodulates the downlink analog signal, extracts the frame plan and transmits it to the access controller. The access controller adjusts the modulation and coding method of the uplink analog signal according to the carrier rate allocated in the frame plan and the smoothed signal-to-noise ratio calculated in step 3. Continuously execute steps 1 to 7 to realize adaptive transmission of low-orbit satellite and low-resource satellite-ground layered decision.

[0017] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] The present invention offloads the large amount of data processed by the satellite base station to each ground terminal, realizing distributed processing and reducing the requirements for the processing capacity of the satellite base station for realizing adaptive transmission; it improves the adaptive transmission processing capability of the entire system and is suitable for uplink adaptive transmission of resource-constrained satellite base stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of an adaptive transmission system for low-orbit satellite and low-resource satellite-ground layered decision-making in an embodiment of the present invention.

[0020] Figure 2 Flowchart of the adaptive transmission method in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Adaptive transmission system for low-orbit satellite and low-resource satellite-ground layered decision making, such as Figure 1 As shown, the system comprises a set of satellite base stations and a group of ground terminals. The satellite base stations consist of the following components: onboard network control, onboard switching, onboard modulator, and onboard demodulator. The onboard network control determines the appropriate carrier rate for the terminal based on resources and satellite link conditions. The onboard switching primarily exchanges information between the onboard modulator, demodulator, and onboard network control. The onboard modulator modulates link layer frames into wireless signals for transmission. The onboard demodulator has the ability to demodulate multiple carriers of varying rates, estimate the uplink carrier signal-to-noise ratio, and generate uplink status messages after receiving uplink status request messages from the ground modulator. The ground terminal consists of the following components: a modulator, demodulator, and access controller. The modulator modulates the link layer frames generated by the access controller into wireless signals for transmission. The demodulator demodulates downlink signals and generates link layer frames. The access controller generates uplink status request messages and radio resource request messages, and determines the modulation and coding scheme to be used based on the carrier rate allocated by the onboard network control.

[0023] The adaptive transmission method for low-orbit satellite low-resource satellite-ground layered decision-making is based on the adaptive transmission system for low-orbit satellite low-resource satellite-ground layered decision-making as described above, such as Figure 2 As shown, the specific steps include:

[0024] Step (1): The access control component of the ground terminal continuously generates uplink status request messages, which are converted into burst analog signals through the ground terminal modulator and sent;

[0025] Specifically, the uplink status application message includes the device ID of the ground terminal, which is used for communication between the ground terminal and the satellite-borne base station;

[0026] Step (2): The onboard demodulator receives the uplink burst analog signal, demodulates it to extract the uplink status request message, extracts the carrier signal-to-noise ratio from the burst analog signal carrying the message, generates an uplink status message, and feeds it back to the ground terminal through onboard switching and onboard modulator.

[0027] Step (3): The ground terminal demodulator demodulates the downlink carrier and receives the uplink status message. The access control extracts the carrier signal-to-noise ratio from multiple uplink status messages and smoothes them to generate the onboard network control reporting frame, which is sent by the modulator.

[0028] Step (4): The onboard demodulator receives the onboard network control reporting frame and transmits it to the onboard network control;

[0029] Step (5): The onboard network control allocates carriers based on the reported signal-to-noise ratio and resource conditions, generates a frame plan, and forwards it to the ground terminal via the onboard modulator;

[0030] Step (6): The ground terminal receives the frame plan, extracts the carrier information, adjusts the modulation and coding method to be sent according to the carrier signal-to-noise ratio, and then repeats steps 1 to 6.

[0031] The above steps are continued to complete the adaptive transmission communication of the satellite-to-ground link.

[0032] Specifically, the uplink status application message, uplink status message, satellite network control reporting frame and frame plan are all link layer frames; Figure 2 The wireless resource request message in the satellite network control reporting frame is the satellite network control reporting frame.

[0033] In summary, the present invention offloads the large amount of data processed by the satellite base station to each ground terminal, realizes distributed processing, reduces the requirements for the processing capacity of the satellite base station to realize adaptive transmission, and improves the adaptive transmission processing capability of the entire system, which is suitable for uplink adaptive transmission of resource-constrained satellite base stations.

[0034] Those skilled in the art will appreciate that the embodiments described are intended to help readers understand the principles of the present invention and should be understood that the scope of protection of the present invention is not limited to the embodiments described. It will be apparent to those skilled in the art that various modifications and variations are possible in the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. An adaptive transmission system for low-orbit satellite-based low-resource satellite-ground layered decision making, characterized by: Including satellite base stations and ground terminals; The satellite-borne base station includes a satellite network control, a satellite switching, a satellite modulator, and a satellite demodulator. The satellite network control selects a corresponding carrier rate and allocates it to the ground terminal based on the remaining carrier resources and the smoothed signal-to-noise ratio reported by the ground terminal, and generates a link layer frame. The smoothed signal-to-noise ratio is the average of multiple uplink carrier signal-to-noise ratios. The satellite switching implements information exchange between the satellite modulator, the satellite demodulator, and the satellite network control. The satellite modulator codes and modulates the link layer frame generated by the satellite demodulator and the satellite network control into a downlink analog signal for transmission. The satellite demodulator is used to demodulate multiple carriers of different rates, estimate the uplink carrier signal-to-noise ratio corresponding to each carrier, and generate a link layer frame. The ground terminal includes a modulator, a demodulator and an access controller; the modulator codes and modulates the link layer frame generated by the access controller into an uplink analog signal for transmission; the demodulator is used to demodulate the downlink analog signal and generate a link layer frame for transmission to the access controller; the access controller is used to generate the link layer frame, cache multiple uplink carrier signal-to-noise ratios and calculate the smoothed signal-to-noise ratio, and adjust the modulation and coding mode for sending the uplink analog signal based on the smoothed signal-to-noise ratio and the carrier rate allocated by the onboard network control.

2. An adaptive transmission method for low-orbit satellite-to-ground layered decision making based on low-resource satellites, characterized in that: The adaptive transmission system for low-orbit satellite and low-resource satellite-ground hierarchical decision-making according to claim 1 is implemented, specifically comprising the following steps: Step 1: The access controller of the ground terminal continuously generates uplink state application information and sends it to the modulator. The modulator modulates the uplink state application information into an uplink analog signal and sends it to the satellite base station. Wherein, the uplink status application information includes the device ID of the ground terminal; Step 2: After receiving the uplink analog signal, the onboard demodulator demodulates it, extracts the uplink status request information, estimates the uplink carrier signal-to-noise ratio corresponding to the uplink analog signal, and generates uplink status information based on the uplink carrier signal-to-noise ratio. The onboard demodulator transmits the uplink status information to the onboard modulator through onboard switching. The onboard modulator modulates the uplink status information into a downlink analog signal and sends it to the ground terminal. Step 3: The demodulator of the ground terminal demodulates the downlink analog signal, extracts the uplink state information and transmits it to the access controller, which obtains the uplink carrier signal-to-noise ratio based on the uplink state information. Step 4: The access controller continuously caches the latest multiple uplink carrier signal-to-noise ratios, records the average of the multiple uplink carrier signal-to-noise ratios as the smoothed signal-to-noise ratio, and generates a satellite network control reporting frame based on the smoothed signal-to-noise ratio and transmits it to the modulator. The modulator modulates the satellite network control reporting frame into an uplink analog signal and sends it to the satellite base station. Step 5: After receiving the uplink analog signal, the onboard demodulator demodulates it, extracts the onboard network control reporting frame, and transmits the onboard network control reporting frame to the onboard network control through onboard switching; Step 6: The onboard network control selects the corresponding carrier rate and allocates it to the ground terminal based on the remaining carrier resources and the smoothed signal-to-noise ratio in the onboard network control report frame. The onboard network control generates a frame plan based on the carrier rate. The onboard network control transmits the frame plan to the onboard modulator through onboard switching. The onboard modulator modulates the frame plan into a downlink analog signal and sends it to the ground terminal. In step 7, the demodulator of the ground terminal demodulates the downlink analog signal, extracts the frame plan and transmits it to the access controller. The access controller adjusts the modulation and coding method of the uplink analog signal according to the carrier rate allocated in the frame plan and the smoothed signal-to-noise ratio calculated in step 3. Continuously execute steps 1 to 7 to realize adaptive transmission of low-orbit satellite and low-resource satellite-ground layered decision.

Images