Communication method, communication device, medium, and program product

Abstract

The invention provides a communication method, a communication device, a medium and a program product, which are applied to a satellite end or a relay station, and comprise the following steps: receiving a first signal based on a receiving antenna, processing the first signal, and demodulating the first signal into a digital signal; acquiring a data mapping cell; the data mapping cell at least comprises information used for representing a modulation coding mode and a corresponding transmitting channel; sending the digital signal to a corresponding transmitting channel based on the data mapping cell; and carrying out modulation processing on the digital signal based on the data mapping cell to form a second signal, and sending the second signal. According to the communication method and the communication device disclosed by the invention, the original complex signal processing flow in the wireless resource control layer and the data link layer is simplified into a data mapping process, so that the complexity of processing data on a satellite is greatly reduced, the communication efficiency is improved, and the cost and the power consumption of the satellite are also remarkably reduced.

Description

Technical Field

[0001] The present disclosure relates to a satellite communication method, and in particular to a novel satellite communication method, device, electronic equipment, and medium. Background Art

[0002] With the development of 6G networks, integrated air-space-ground networks have become an inevitable trend. Low-Earth Orbit (LEO) satellites, due to their relatively low orbital altitude, offer low transmission latency and low link loss, making them ideally suited for satellite internet services. LEO satellite communications have become a crucial component of 6G networks, with a wide range of applications, including emergency communications, universal services, and air-sea communications.

[0003] Low-orbit satellite communication systems offer significant advantages in remote areas, mobile environments, emergency situations, military communications, IoT access, aviation communications, ocean monitoring and protection, remote education, and healthcare. The communication payload, the core of a low-orbit satellite, is primarily responsible for signal reception, processing, and forwarding, building a satellite communication network and providing high-speed, stable broadband satellite internet access services to users worldwide. Therefore, given the limited weight, energy, and other resources of low-orbit satellites, developing more efficient and reliable communication payload technologies to enable real-time, stable, and high-speed data transmission between user satellite payloads and ground equipment has become a top priority.

[0004] Currently, the communication payload mainly includes transparent forwarding mode and on-board regeneration mode, such as Figure 1 As shown, in transparent forwarding mode, a satellite communication system only transparently forwards signals without demodulating, decoding, or re-modulating them. This process barely alters the signal content, hence the name "transparent." After receiving the signal from the ground station / user terminal, the satellite directly filters, amplifies, and converts it to a different frequency—typically, different frequency bands for the uplink and downlink—before retransmitting it to the user terminal / ground station. This processing method is technically low-complexity, lightweight, and consumes low power. However, transparent forwarding mode also has its drawbacks: the transmission process is affected by the combined signal-to-noise ratio degradation of the two links, resulting in degraded signal quality, reduced signal-to-noise ratio, low energy efficiency, and a high cost for increasing communication speeds. Furthermore, since only frequency shifting is performed at the physical layer, the channel bandwidth of the user link and feeder / relay link must be one-to-one, making it impossible to support different bandwidths or modulation schemes between the two links. Limited by the spectrum bandwidth of a single link, this results in limited flexibility.

[0005] On-board regenerative processing mode refers to the process in which the satellite demodulates, decodes, and processes the received signal to restore the original information, and then re-encodes, modulates, and sends it out according to the new protocol system. This processing method can eliminate the noise accumulation of the uplink, improve the communication quality and spectrum utilization. Figure 2However, it also has disadvantages: high technical complexity: the onboard regeneration processing payload requires various complex digital processing technologies and algorithms in the data link layer and radio resource control layer protocols, so its technical complexity is relatively high; increased satellite cost: the onboard regeneration processing payload requires additional hardware and software support, which increases the cost of the satellite; increased satellite weight and power consumption: the onboard regeneration processing payload requires complex computing and processing resources, which increases weight and power consumption; increased operational and maintenance complexity: the data link layer and radio resource control layer protocol upgrades are frequent, which increases the complexity of satellite operation and maintenance. Summary of the Invention

[0006] The technical problem to be solved by the present disclosure is to overcome the defects in the existing technology and provide a communication method, communication device, medium and program product with low operation and maintenance complexity and low cost and power consumption.

[0007] The present disclosure solves the above technical problems through the following technical solutions:

[0008] A communication method, applied to a satellite terminal or a relay station, comprising:

[0009] receiving a first signal based on a receiving antenna, processing the first signal, and then demodulating the first signal into a digital signal;

[0010] Acquire a data mapping information element; the data mapping information element at least includes information for characterizing a modulation and coding mode and a corresponding transmission channel;

[0011] Sending the digital signal to a corresponding transmission channel based on the data mapping element;

[0012] The digital signal is modulated based on the data mapping element to form a second signal for transmission.

[0013] Preferably, when the first signal is a forward link direction signal of the feeder link / relay link, the data mapping element includes a forward link beam ID, a forward link timestamp and a forward link ModCod, the forward link ModCod is used to characterize the modulation and coding method, and the forward link beam ID is used to characterize the corresponding transmission channel.

[0014] Preferably, the step of modulating the digital signal based on the data mapping element to form a second signal for transmission includes:

[0015] Encapsulating the digital signal into a physical layer bit stream based on the forward link beam ID, the designated time represented by the forward link timestamp, and the modulation and coding scheme represented by the forward link ModCod;

[0016] After signal amplification, filtering and frequency conversion, a second signal is formed and sent.

[0017] Preferably, when the first signal is a reverse link direction signal of a feeder link / relay link, the data mapping element includes a reverse link channel ID, reverse link time slot information, reverse link Es / N0, reverse link power deviation, reverse link time deviation, reverse link frequency deviation and reverse link ModCod, wherein the reverse link ModCod is used to characterize the modulation and coding method, and the reverse link channel ID is used to characterize the corresponding transmission channel.

[0018] Preferably, the digital signal is modulated based on the data mapping element to form a second signal for transmission; including:

[0019] Encapsulating the digital signal into a physical layer bit stream based on the reverse link channel ID and the reverse link Es / N0, the reverse link time slot information and the designated time represented by the reverse link time offset, the reverse link power offset and the reverse link frequency offset, and the modulation and coding scheme represented by the reverse link ModCod,

[0020] After signal amplification, filtering and frequency conversion, a second signal is formed and sent.

[0021] Preferably, the processing and demodulating the first signal into a digital signal comprises:

[0022] The first signal is amplified, filtered, and frequency-converted into an intermediate frequency signal, and then sampled by an ADC and demodulated and decoded into a digital signal.

[0023] Preferably, the information included in the data mapping information element and used to characterize the modulation and coding mode and the corresponding transmission channel is determined based on at least one of weather conditions, channel quality and link margin.

[0024] The present disclosure further provides a communication device, applied to a satellite terminal or a relay station, comprising an L1 layer of a user link and an L1 layer and an L2 layer of a feeder link / relay link, the device further comprising:

[0025] A user link transceiver antenna, configured to receive a first signal of the user link and send a second signal of the user link;

[0026] A user link processing module, configured to process and demodulate the first signal of the user link; and to process and code-modulate the second signal of the user link;

[0027] A data mapping module is configured to obtain a data mapping cell; the data mapping cell at least includes information for characterizing a modulation and coding scheme and a corresponding transmission channel;

[0028] A feeder link / relay link module, configured to process and demodulate a first signal of the feeder link / relay link, and to process and code-modulate a second signal of the feeder link / relay link;

[0029] The feeder link / relay link transceiver antenna is used to receive a first signal of the feeder link / relay link and send a second signal of the feeder link / relay link.

[0030] Another aspect of the present disclosure provides a communication device applied to a base station, wherein the base station includes an L1 layer and an L2 layer of a feeder link / relay link, and the communication device is used to communicate with the above-mentioned communication device.

[0031] Another aspect of the present disclosure provides a computer program product comprising a computer program, wherein when executed by a processor, the computer program implements any of the above-described communication methods. The above-described preferred conditions may be arbitrarily combined, consistent with common knowledge in the art, to obtain preferred embodiments of the present disclosure.

[0032] The positive progressive effect of the present disclosure is that the communication method and communication device of the present disclosure simplify the originally complex signal processing processes in the wireless resource control layer and the data link layer into a data mapping process, greatly reducing the complexity of on-board data processing, and still having highly complex computing tasks processed by ground base stations, realizing efficient division of labor in satellite-ground collaboration, which not only improves communication efficiency, but also significantly reduces the cost and power consumption of satellites. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the composition and signal flow of transparent forwarding payload in the prior art;

[0034] Figure 2 Schematic diagram of the composition and signal flow of the regeneration processing load in the prior art;

[0035] Figure 3 A schematic diagram of a control plane protocol stack of a satellite terminal applying the communication method provided in Example 1 of the present disclosure;

[0036] Figure 4 A schematic diagram of a data plane protocol stack on a satellite side applying the communication method provided in Example 1 of the present disclosure;

[0037] Figure 5 A flow chart of the communication method provided in Example 1 of the present disclosure;

[0038] Figure 6 A schematic structural diagram of a data mapping cell for a feeder link / relay link provided in Example 1 of the present disclosure;

[0039] Figure 7A schematic diagram of the structure of a data mapping cell for a user link is provided for embodiment 1 of the present disclosure;

[0040] Figure 8 A schematic diagram of a module of a communication device provided in Embodiment 2 of the present disclosure;

[0041] Figure 9 A signal flow diagram of a communication device provided in Example 2 of the present disclosure. DETAILED DESCRIPTION

[0042] The present disclosure is further illustrated below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0043] In the embodiments of the present disclosure, prefixes such as "first" and "second" are used only to distinguish different description objects and have no limiting effect on the position, order, priority, quantity or content of the described objects. In the embodiments of the present disclosure, the use of prefixes such as ordinal numbers to distinguish description objects does not constitute a restriction on the described objects. For the statement of the described objects, please refer to the description in the context of the embodiments, and the use of such prefixes should not constitute an unnecessary restriction. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0044] Example 1

[0045] Figure 3 A schematic diagram of a control plane protocol stack on a satellite side of a communication method provided by an exemplary embodiment of the present disclosure is provided. Figure 4 A schematic diagram of a data plane protocol stack for a communication method provided as an exemplary embodiment of the present disclosure is applied to a satellite terminal or relay station. The satellite terminal / relay station deploys the user link L1 layer, i.e., the physical layer; the feeder link / relay link L1 and L2 layers, i.e., the data link layer; and the satellite-to-ground adaptation layer. The user link L1 layer is used to communicate with the terminal, while the user link L2 layer and above functions are retained on the ground base station. Alternatively, those skilled in the art may determine that the satellite terminal / relay station deploys only some of the feeder link / relay link L2 layer functions, not necessarily all of the L2 layer.

[0046] like Figure 3 As shown, the ground base station deploys the L1 and L2 layers of the feeder / relay link, as well as the satellite-to-ground adaptation layer. The L1 and L2 layers of the feeder / relay link are used to communicate with the satellite via the feeder / relay link. The ground base station retains the functional layers above L2 on the user link side. The ground base station also communicates with the core network. Alternatively, a relay station can have the same architecture as the satellite.

[0047] The L2 layer of the satellite side sets up a Satellite Earth Adaptation Protocol (SEAP) stack for controlling data carrying.

[0048] This communication method is applied to a satellite terminal or a relay station, such as Figure 5 As shown, specifically including,

[0049] S10, receiving a first signal based on a receiving antenna, processing the first signal, and then demodulating the first signal into a digital signal;

[0050] S20, obtaining a data mapping information element; the data mapping information element at least includes information for characterizing a modulation and coding scheme and a corresponding transmission channel;

[0051] S30, sending the digital signal to a corresponding transmission channel based on the data mapping element;

[0052] S40: Modulate the digital signal based on the data mapping element to form a second signal for transmission.

[0053] In S10, the first signal is processed and demodulated into a digital signal. This specifically includes two steps: signal processing and demodulation. The processing includes filtering, amplifying, and frequency converting the first signal. More specifically, the first signal is input into a bandpass filter for filtering to eliminate noise. The filtered signal is then input into a low-noise amplifier for amplification. The amplified signal is then fed into a local oscillator for down-conversion to an intermediate frequency signal. The intermediate frequency signal is sampled by an ADC and then input into a demodulator for demodulation and decoding into a digital signal.

[0054] S20, obtain a data mapping element; the data mapping element at least contains information for characterizing the modulation and coding method and the corresponding transmission channel; specifically, the demodulated and decoded digital signal is sent to the data mapping module, the data mapping module, the data mapping module is used to obtain the data mapping element to determine the coding method and the corresponding transmission channel.

[0055] Specifically, for the forward link direction, from the base station to the satellite and user terminal, the first signal is a feeder link / relay link signal, and the data mapping element should be sent from the ground base station to the satellite end at the same time as the first signal. At this time, the data mapping module can obtain the data mapping element in the digital signal after modulation and demodulation. The data mapping element should be as concise as possible, at least including information representing the modulation and coding method and the corresponding transmission channel. For the feeder link / relay link signal, at least information such as the beam ID of the user link and the modulation and coding method of the user link downlink is included.

[0056] like Figure 6As shown, it includes a forward link beam ID, a forward link timestamp and a forward link ModCod. The forward link ModCod is used to characterize the modulation and coding mode, and the forward link beam ID is used to characterize the corresponding transmission channel.

[0057] When the first signal is a reverse link direction signal of a feeder link / relay link or a relay link, the data mapping information element shall include a reverse link channel ID, reverse link time slot information, reverse link Es / N0 (symbol signal-to-noise ratio), reverse link power deviation, reverse link time deviation, reverse link frequency deviation, reverse link ModCod and service data, wherein the reverse link ModCod is used to characterize the modulation and coding mode, and the reverse link channel ID is used to characterize the corresponding transmission channel. Figure 7 shown.

[0058] For the reverse link direction, when the first signal is a forward link direction signal of a feeder link / relay link or a relay link, the data mapping element includes a forward link beam ID, a forward link timestamp, and a forward link ModCod, wherein the forward link ModCod is used to characterize the modulation and coding method, and the forward link beam ID is used to characterize the corresponding transmission channel.

[0059] The first signal transmitted from the user terminal to the satellite end is received by the user link transceiver antenna of the satellite end. After signal processing and modulation and demodulation by the user link processing module, the modulated and decoded data is sent to the data mapping module. The data mapping module encapsulates the service data into PDUdate and the control signal into reverse link channel ID, reverse link time slot information, reverse link Es / N0, reverse link power deviation, reverse link time deviation, reverse link frequency deviation, and reverse link ModCod, thus forming the data mapping information element.

[0060] The ModCod in the data mapping element is used to identify the modulation and coding scheme, and the reverse link channel ID is used to identify the corresponding transmission channel. The rules for determining the coding scheme and the corresponding transmission channel should be based on at least one of weather conditions, channel quality, and link margin. Specifically, the data mapping rules can be many-to-one, one-to-one, or one-to-many, meaning that multiple received first information can be sent via the same channel, one received first information can be sent via multiple channels, or one channel receives and one channel transmits.

[0061] For example, when the rain attenuation caused by severe weather is large and the link margin is insufficient, it can be mapped to many-to-one, concentrating the signal power on a single channel for transmission, increasing the power spectrum density, reducing the user rate, and ensuring the reliability of user communications.

[0062] When weather conditions are good, channel quality is good, and link margin is sufficient, mapping can be done to one-to-one or one-to-many, sending signal power on multiple channels to increase user rates.

[0063] S30, sending the digital signal to a corresponding transmission channel based on the preset information element;

[0064] Specifically, for the forward link direction, the data mapping module encapsulates the service data into PDUdate, combines it with the data mapping cell, and sends it to the user link processing module.

[0065] For the reverse link direction, the data mapping module encapsulates the service data into PDUdate, combines it with the data mapping cell, and sends the digital signal to the feeder link / relay link processing module.

[0066] S40: Modulate the digital signal based on the data mapping element to form a second signal for transmission.

[0067] For the forward link, the user link processing module maps the digital signal to the data element according to the above data, encapsulates the corresponding data into a physical layer bit stream at the specified time represented by the forward link timestamp, the specified beam ID, and the modulation and coding method represented by the forward link ModCod. After signal amplification, filtering, and frequency conversion, it is sent to the user link antenna for transmission. Each service signal is transmitted to the user terminal by a different beam.

[0068] For the reverse link direction, the feeder link / relay link processing module maps the digital signal to the above-mentioned data element, modulates and encodes the corresponding data into the physical layer bit stream according to the frame format of the feeder link / relay link at the specified time and specified channel ID; then, after signal amplification, filtering, and frequency conversion, it is sent to the feeder link / relay link antenna, and then sent to the ground base station via the feeder antenna.

[0069] The communication method of this embodiment simplifies the originally complex signal processing processes in the radio resource control layer and the data link layer into a data mapping process, greatly reducing the complexity of onboard data processing. Highly complex computing tasks are still processed by ground base stations, achieving efficient division of labor in satellite-ground collaboration, which not only improves communication efficiency but also significantly reduces the cost and power consumption of satellites.

[0070] Example 2

[0071] Corresponding to the aforementioned communication method embodiment, the present disclosure also provides a communication device embodiment.

[0072] Figure 8 A schematic diagram of a module of a communication device provided by an exemplary embodiment of the present disclosure, applied to a satellite or a relay terminal, includes:

[0073] The user link transceiver antenna is used to receive the first signal of the user link and send the second signal of the user link; specifically, it is used for converting electromagnetic wave signals into electrical signals.

[0074] The user link processing module is used to process and demodulate the first signal of the user link; and to process and code-modulate the second signal of the user link; preferably, Figure 6 As shown, the user link processing module includes two parts: user link processing and user link RF front end.

[0075] The user link processing is used to perform signal encoding and decoding, A / D or D / A conversion, and the user link RF front end is used to amplify, filter and frequency convert the signal.

[0076] The data mapping module is used to obtain a data mapping symbol; the data mapping symbol contains at least information used to characterize the modulation and coding method and the corresponding transmission channel; and send the digital signal to the corresponding transmission channel based on the data mapping symbol. That is, this module is specifically responsible for completing the forward and reverse data mapping and adaptation functions between the feeder link / relay link and the user link.

[0077] a feeder link / relay link processing module, configured to process and demodulate a first signal of the feeder link / relay link, and to process and code-modulate a second signal of the feeder link / relay link;

[0078] Similarly, the feeder link / relay link processing module also includes two small modules: feeder link / relay link processing and feeder link / relay link RF front end. The feeder link / relay link processing is used for encoding and decoding, A / D or D / A conversion, and the feeder link / relay link RF front end is used for signal amplification, filtering and frequency conversion.

[0079] The feeder link / relay link transceiver antenna is used to receive the first signal of the feeder link / relay link and send the second signal of the feeder link / relay link, and also complete the conversion of electromagnetic wave signals into electrical signals.

[0080] in Figure 9 This is another schematic diagram of a device that uses signal flow as an indicator. Figure 9 When the receiving antenna in is the user link transceiver antenna, the transmitting antenna is the feeder link transceiver antenna. Similarly, when the receiving antenna is the feeder link transceiver antenna, the transmitting antenna is the feeder link transceiver antenna.

[0081] The above-mentioned feeder link and relay link are related based on the location where the device or method is applied. For example, if it is applied to a relay station, it is a relay link, and if it is applied to a satellite end, it is a feeder link.

[0082] This communication device simplifies the originally complex signal processing processes in the wireless resource control layer and data link layer into a data mapping process, greatly reducing the complexity of data processing on the satellite. The highly complex computing tasks are still processed by the ground base station, realizing efficient division of labor in satellite-ground collaboration, which not only improves communication efficiency, but also significantly reduces the cost and power consumption of the satellite.

[0083] The present disclosure also provides a communication device applied to a base station, wherein the base station includes an L1 layer and an L2 layer of a feeder link / relay link, and the communication device is used to communicate with the communication device of the above-mentioned satellite terminal / relay station.

[0084] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the partial description of the method embodiments. The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components of the units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the disclosed solution.

[0085] Example 3

[0086] An embodiment of the present disclosure further provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the communication method provided by any of the above embodiments is implemented.

[0087] The readable storage medium may include, but is not limited to, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0088] Example 4

[0089] An embodiment of the present disclosure further provides a computer program product, including a computer program, which implements any of the above-mentioned communication methods when executed by a processor.

[0090] The program code for executing the computer program product of the present disclosure may be written in any combination of one or more programming languages, and the program code may be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on the remote device.

[0091] While specific embodiments of the present disclosure have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, and such changes and modifications are intended to fall within the scope of protection of the present disclosure.

Claims

1. A communication method, characterized in that: Applied to a satellite terminal or a relay station, the method includes: receiving a first signal based on a receiving antenna, processing the first signal, and then demodulating the first signal into a digital signal; Get data mapping information element; The data mapping information element at least includes information for characterizing a modulation and coding mode and a corresponding transmission channel; Sending the digital signal to a corresponding transmission channel based on the data mapping element; The digital signal is modulated based on the data mapping element to form a second signal for transmission.

2. The communication method according to claim 1, wherein: When the first signal is a forward link direction signal of the feeder link / relay link, the data mapping element includes a forward link beam ID, a forward link timestamp and a forward link ModCod, the forward link ModCod is used to characterize the modulation and coding method, and the forward link beam ID is used to characterize the corresponding transmission channel.

3. The communication method according to claim 2, wherein: The step of modulating the digital signal based on the data mapping cell to form a second signal for transmission includes: Encapsulating the digital signal into a physical layer bit stream based on the forward link beam ID, the designated time represented by the forward link timestamp, and the modulation and coding scheme represented by the forward link ModCod; After signal amplification, filtering and frequency conversion, a second signal is formed and sent.

4. The communication method according to claim 1, wherein: When the first signal is a reverse link direction signal of a feeder link / relay link, the data mapping element includes a reverse link channel ID, reverse link time slot information, reverse link Es / N0, reverse link power deviation, reverse link time deviation, reverse link frequency deviation and reverse link ModCod, wherein the reverse link ModCod is used to characterize the modulation and coding method, and the reverse link channel ID is used to characterize the corresponding transmission channel.

5. The communication method according to claim 4, wherein: Modulating the digital signal based on the data mapping element to form a second signal for transmission; include ， Encapsulating the digital signal into a physical layer bit stream based on the reverse link channel ID and the reverse link Es / N0, the reverse link time slot information and the designated time represented by the reverse link time offset, the reverse link power offset and the reverse link frequency offset, and the modulation and coding scheme represented by the reverse link ModCod, After signal amplification, filtering and frequency conversion, a second signal is formed and sent.

6. The communication method according to claim 1, wherein: The processing of the first signal and then demodulating the signal into a digital signal includes: The first signal is amplified, filtered, and frequency-converted into an intermediate frequency signal, and then sampled by an ADC and demodulated and decoded into a digital signal.

7. The communication method according to claim 1, wherein: The information included in the data mapping information element and used to characterize the modulation and coding mode and the corresponding transmission channel is determined based on at least one of weather conditions, channel quality and link margin.

8. A communication device, characterized in that: Applied to a satellite terminal or a relay station, including the L1 layer of the user link and the L1 layer and L2 layer of the feeder link / relay link, the device also includes: A user link transceiver antenna, configured to receive a first signal of the user link and send a second signal of the user link; A user link processing module, configured to process and demodulate the first signal of the user link; and for processing and coding and modulating the second signal of the user link; A data mapping module is configured to obtain a data mapping cell; the data mapping cell at least includes information for characterizing a modulation and coding scheme and a corresponding transmission channel; and sending the digital signal to the corresponding transmission channel based on the data mapping element; A feeder link / relay link processing module, configured to process and demodulate a first signal of the feeder link / relay link, and to process and code-modulate a second signal of the feeder link / relay link; The feeder link / relay link transceiver antenna is used to receive a first signal of the feeder link / relay link and send a second signal of the feeder link / relay link.

9. A communication device, characterized in that: Applied to a base station, the base station includes an L1 layer and an L2 layer of a feeder link / relay link, and the communication device is used to communicate with the communication device according to claim 8.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the communication method according to any one of claims 1 to 7 is implemented.

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