Unauthorized Signal Access Method, System, Terminal and Storage Medium

Abstract

The present invention discloses an unauthorized signal access method, system, terminal and storage medium. The method includes: sending an unauthorized preamble to a base station; receiving a channel sorting result and an interference threshold value feedback by the base station according to the unauthorized preamble, the authorized preamble of an authorized terminal and the authorized signal transmission power; determining the unauthorized signal transmission power according to a power distribution factor and the channel sorting result; taking an unauthorized terminal with an unauthorized information transmission power less than the interference threshold value as a target terminal; encoding a signal to be transmitted corresponding to the target terminal to obtain an unauthorized encoded signal; superimposing the authorized encoded signal and the unauthorized encoded signal, and accessing the target terminal to the base station based on the superimposed encoded signal. In this embodiment, the target terminal is determined according to the interference threshold value and the signals are encoded and superimposed, and a time backoff access method combining channel gain and signal rate is adopted, so as to improve the access performance of the terminal under low load and low interference.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and in particular, to an unlicensed signal access method, system, terminal, and storage medium. Background Art

[0002] Currently, when a base station and a terminal establish a connection for data transmission, a method combining partial authorization and unlicensed access is adopted, that is, a semi-unlicensed access method. However, semi-unlicensed access based on power non-orthogonal multiple access can only achieve performance advantages under high load and high interference conditions, and its performance will be reduced under low interference or low load.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main object of the present invention is to provide an unlicensed signal access method, system, terminal, and storage medium, aiming to solve the technical problem of how to improve the performance of terminal access under low interference or low load.

[0005] To achieve the above object, the present invention provides an unlicensed signal access method, and the unlicensed signal access method includes the following steps:

[0006] Send an unlicensed preamble to the base station;

[0007] Receive a channel sorting result and an interference threshold value fed back by the base station according to the unlicensed preamble, the authorized preamble of the authorized terminal, and the authorized signal transmission power;

[0008] Determine the unlicensed signal transmission power according to a power allocation factor and the channel sorting result;

[0009] Use an unlicensed terminal whose unlicensed signal transmission power is less than the interference threshold value as a target terminal;

[0010] Encode a signal to be sent corresponding to the target terminal to obtain an unlicensed encoded signal;

[0011] Superimpose the authorized encoded signal and the unlicensed encoded signal, and access the target terminal to the base station based on the superimposed encoded signal.

[0012] Optionally, the step of encoding a signal to be sent corresponding to the target terminal to obtain an unlicensed encoded signal includes:

[0013] Divide the transmission signal corresponding to the target terminal into a private signal and a public signal according to a rate splitting factor;

[0014] Encode the private signal and the public signal respectively to obtain an unlicensed encoded signal.

[0015] Optionally, after the step of superimposing the authorized encoded signal and the unlicensed encoded signal and accessing the target terminal to the base station based on the superimposed encoded signal, the method further includes:

[0016] Receive the private signal-to-interference-plus-noise ratio (SINR) and the public SINR sent by the base station;

[0017] Determine the private signal transmission rate according to the private signal packet length, the private SINR, and the private signal packet loss rate;

[0018] Determine the public signal transmission rate according to the public signal packet length, the public SINR, and the public signal packet loss rate;

[0019] Determine the unlicensed terminal signal transmission rate according to the private signal transmission rate and the public signal transmission rate.

[0020] Optionally, after the step of determining the unlicensed terminal signal transmission rate according to the private signal transmission rate and the public signal transmission rate, the method further includes:

[0021] Determine the access time of the unlicensed terminal according to the unlicensed terminal signal transmission rate and the channel sorting result.

[0022] To achieve the above object, the present invention provides an unlicensed signal access method, and the unlicensed signal access method includes the following steps:

[0023] Receive the authorization preamble and the authorization signal transmission power sent by the authorized terminal, and receive the unlicensed preamble sent by the unlicensed terminal;

[0024] Determine the channel gain according to the authorization preamble and the unlicensed preamble;

[0025] Sort the channel gain, and determine the interference threshold according to the channel gain and the authorization signal transmission power;

[0026] Send the channel sorting result and the interference threshold to the unlicensed terminal;

[0027] Receive the superimposed encoded signal sent by the unlicensed terminal to access the unlicensed terminal.

[0028] Optionally, after the step of receiving the superimposed encoded signal sent by the unlicensed terminal to access the unlicensed terminal, the method further includes:

[0029] Decode the public signal, the authorization encoding information, and the private signal in the superimposed encoded signal in sequence.

[0030] Optionally, after the step of decoding in sequence according to the public signal, the authorized coding information, and the private signal in the superimposed coded signal, the method further includes:

[0031] Determining the public signal-to-interference-plus-noise ratio and the private signal-to-interference-plus-noise ratio, and sending the public signal-to-interference-plus-noise ratio and the private signal-to-interference-plus-noise ratio to the unauthorized terminal;

[0032] Combining the decoded public signal and the decoded private signal to obtain the transmission signal of the unauthorized terminal.

[0033] In addition, to achieve the above object, the present invention further provides an unauthorized signal access system, where the unauthorized signal access system includes the unauthorized terminal and the base station described above to implement data interaction between the unauthorized terminal and the base station

[0034] In addition, to achieve the above object, the present invention further provides a terminal, where the terminal includes a memory, a processor, and an unauthorized signal access program stored on the memory and executable on the processor, and the unauthorized signal access program is configured to implement the unauthorized signal access method as described above.

[0035] In addition, to achieve the above object, the present invention further provides a storage medium, where an unauthorized signal access program is stored on the storage medium, and when the unauthorized signal access program is executed by a processor, it implements the unauthorized signal access method as described above.

[0036] The present invention discloses an unauthorized signal access method, system, terminal, and storage medium. The method includes: sending an unauthorized preamble to a base station; receiving a channel sorting result and an interference threshold value fed back by the base station according to the unauthorized preamble, the authorized preamble of the authorized terminal, and the authorized signal transmission power; determining the unauthorized signal transmission power according to a power allocation factor and the channel sorting result; using an unauthorized terminal with an unauthorized signal transmission power less than the interference threshold value as a target terminal; encoding a signal to be transmitted corresponding to the target terminal to obtain an unauthorized coded signal; superimposing the authorized coded signal and the unauthorized coded signal, and accessing the target terminal to the base station based on the superimposed coded signal. In this embodiment, a target terminal with a transmission power less than the interference threshold value is selected, and its signal to be transmitted is encoded and superimposed and transmitted to the base station. Further, a time backoff access method combining channel gain and signal rate is adopted, so that the base station does not need to be in a high-load and high-interference situation all the time, thereby improving the access performance of the terminal. Description of the Drawings

[0037] Figure 1 It is a schematic flowchart of the first embodiment of the unauthorized signal access method of the present invention;

[0038] Figure 2 It is a schematic flowchart of the second embodiment of the unauthorized signal access method of the present invention;

[0039] Figure 3 It is a schematic flowchart of the third embodiment of the unauthorized signal access method of the present invention;

[0040] Figure 4 It is an unauthorized signal access system according to an embodiment of the unauthorized signal access method of the present invention;

[0041] Figure 5 It is a signaling diagram of unauthorized terminal signal access according to an embodiment of the unauthorized signal access method of the present invention.

[0042] Figure 6 It is a flowchart of terminal signal coding transmission according to an embodiment of the unauthorized signal access method of the present invention.

[0043] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiment

[0044] Refer to Figure 1 , Figure 1 It is a schematic flowchart of the first embodiment of the unauthorized signal access method of the present invention, and the first embodiment of the unauthorized signal access method of the present invention is proposed.

[0045] Step S10: Send the unauthorized preamble to the base station.

[0046] It should be noted that the execution subject of this embodiment can be an unauthorized terminal with data processing, network communication and program running functions, or other electronic devices that can achieve the same or similar functions. This embodiment does not limit this.

[0047] It should be understood that in the current research on random access, semi-unauthorized random access includes semi-unauthorized random access based on NOMA. However, the main drawback is that the semi-unauthorized random access based on NOMA can only achieve its random access performance advantages under high load and high interference conditions.

[0048] In order to overcome the above defects, this embodiment sets an interference threshold value, and determines the unauthorized terminals that can be accessed according to the interference threshold value. Therefore, a large number of unauthorized terminals or a certain number of unauthorized terminals can be accessed. At the same time, when the base station receives the superimposed transmission information sent by the unauthorized terminals, serial interference cancellation is used for decoding, so that it is not necessary to always be under high load and high interference to maintain the access performance of the unauthorized terminals.

[0049] It should be noted that semi-grant-free random access combines partial grant access and grant-free access. When the grant terminal occupies the channel, the channel of the grant terminal is shared with the grant-free terminal, enabling the grant terminal and the grant-free terminal to access the base station simultaneously, thereby effectively increasing the number of system terminal accesses, ensuring the quality of service for specific users, and reducing the terminal access overhead.

[0050] It can be understood that this embodiment includes multiple grant-free terminals, and this embodiment does not impose any restrictions on the number of grant-free terminals. At the same time, the grant-free signal access system includes an authorized terminal and a base station. For ease of understanding, refer to Figure 4 , Figure 4 which is a grant-free signal access system. There is one base station, one authorized terminal, and multiple grant-free terminals in the figure. The authorized terminal and the grant-free terminals transmit signals to the base station.

[0051] It can be understood that the grant-free terminal and the authorized terminal will randomly select their respective preambles from the preamble set and send the selected grant preamble and grant-free preamble to the base station. And the M preambles are orthogonal to each other, that is, they satisfy and

[0052] It can be understood that represents the start of an Ethernet frame and is also a flag that the peer network card can ensure synchronization with. At the end of the preamble is a field called SFD with a value of 11. After this field is the body of the Ethernet frame. The preamble + SFD together occupy 8 bytes. The preamble is a group of bits at the start of the data packet, based on which the receiver can synchronize and prepare to receive the actual data.

[0053] Step S20: Receive the channel sorting result and interference threshold value fed back by the base station according to the grant-free preamble, the grant preamble of the authorized terminal, and the grant signal transmission power.

[0054] It should be noted that after the base station receives the grant preamble and grant signal transmission power sent by the authorized terminal and the grant-free preamble sent by the grant-free terminal, it determines the channel gain according to the grant preamble, grant signal transmission power, and grant-free preamble, sorts the channel gain to obtain the channel sorting result, determines the interference threshold value according to the channel sorting result and the grant signal transmission power, and then the base station sends the channel sorting result, interference threshold value, and grant signal transmission power to the grant-free terminal.

[0055] Step S30: Determine the grant-free signal transmission power according to the power allocation factor and the channel sorting result.

[0056] It should be noted that according to the transmission power P of the grant-free terminal k', the power allocation factor α of the license-free terminal k' And determine the partial signal transmission power of the license-free terminal according to the channel sorting result

[0057] Step S40: Use the license-free terminal whose license-free signal transmission power is less than the interference threshold as the target terminal.

[0058] It should be noted that when the license-free signal transmission power is greater than the interference threshold, the license-free terminal does not send useful data on the time-frequency resource. When the license-free signal transmission power is less than the interference threshold, the license-free terminal is used as the target terminal. And calculate the transmission rate of the target terminal, calculate the access time of each target terminal to the base station according to the transmission rate of the target terminal, prevent each target terminal from accessing the base station simultaneously, improve the access performance of the license-free terminal, and reduce the signaling overhead.

[0059] Step S50: Encode the signal to be transmitted corresponding to the target terminal to obtain a license-free encoded signal.

[0060] It should be noted that the authorized terminal encodes the useful signal and sends it to the time-frequency resource allocated by the base station. The signal sent by the authorized terminal to the base station can be P0 is the power of the authorized terminal to send the useful signal, s 0' It can be the information after encoding of the authorized terminal. At the same time, the target terminal divides the signal to be transmitted into a public signal and a private signal according to the rate splitting factor, and encodes the public signal and the private signal respectively.

[0061] Step S60: Superimpose the authorized encoded signal and the license-free encoded signal, and connect the target terminal to the base station based on the superimposed encoded signal.

[0062] It should be understood that the encoded information sent by the authorized terminal to the base station and the encoded information sent by the target terminal to the base station are superimposed and sent on the same time-frequency resource allocated by the base station.

[0063] It can be understood that the superimposition can be performed in the order of the encoded public signal and the encoded private signal of the target terminal. This embodiment does not limit this.

[0064] In this embodiment, the grant-free preamble is sent to the base station; the base station receives the channel sorting result and interference threshold value fed back according to the grant-free preamble, the grant preamble of the authorized terminal, and the authorized signal transmission power; the grant-free signal transmission power is determined according to the power allocation factor and the channel sorting result; the grant-free terminal with the grant-free signal transmission power less than the interference threshold value is used as the target terminal; the signal to be transmitted corresponding to the target terminal is encoded to obtain a grant-free encoded signal; the grant-encoded signal and the grant-free encoded signal are superimposed, and the target terminal is connected to the base station based on the superimposed encoded signal. In this embodiment, the target terminal with a transmission power less than the interference threshold value is selected, and its signal to be transmitted is encoded and superimposed and then transmitted to the base station. Further, a time backoff access method combining channel gain and signal rate is adopted, so that the base station does not always be in a high-load and high-interference situation, thereby improving the access performance of the terminal.

[0065] Refer to Figure 2 , Figure 2 which is a schematic flowchart of the second embodiment of the grant-free signal access method of the present invention. Based on the above Figure 1 shown first embodiment, the second embodiment of the grant-free signal access method of the present invention is proposed.

[0066] In the second embodiment, the step S50 includes:

[0067] Step S501: Split the transmission signal corresponding to the target terminal into a private signal and a public signal according to the rate splitting factor.

[0068] It should be noted that in this embodiment, the rate splitting multiple access method is used to split the transmission signal corresponding to the target terminal into a private signal and a public signal. Rate-Splitting Multiple Access (RSMA) is a candidate multiple access technology for the next-generation air interface. The rate splitting technology splits the information of multiple users into public signals and private signals at the transmitter, and then superimposes and transmits the combined public signals of multiple users and the private signals. At the receiver, after receiving the superimposed information, serial interference cancellation is used to decode the public signal first and then decode their respective private signals. This technology has the potential to support massive access and meet the differentiated communication requirements of devices.

[0069] It should be noted that the grant-free terminal splits its respective useful message W k' into the public signal W k',1 and the private signal W k',2 .

[0070] Step S502: Encode the private signal and the public signal respectively to obtain a grant-free encoded signal.

[0071] It should be noted that the public signal Wk',1 and the private signal W k',2 are respectively encoded as s k',1 and s k',2 and superimposed. The superimposed encoded information can be:

[0072]

[0073] where x k' represents the superimposed encoded signal, α k' represents the power allocation factor, P k' represents the transmission power of the unlicensed terminal, s k',1 represents the encoded public signal, s k',2 represents the encoded private signal.

[0074] Furthermore, in order to prevent the base station from being overloaded, after the step of superimposing the authorized encoded signal and the unlicensed encoded signal and accessing the target terminal to the base station based on the superimposed encoded signal, the following steps are further included:

[0075] Receiving the private signal-to-interference-plus-noise ratio and the public signal-to-interference-plus-noise ratio sent by the base station;

[0076] Determining the private signal transmission rate according to the private signal data packet length, the private signal-to-interference-plus-noise ratio, and the private signal packet loss rate;

[0077] Determining the public signal transmission rate according to the public signal data packet length, the public signal-to-interference-plus-noise ratio, and the public signal packet loss rate;

[0078] Determining the unlicensed terminal signal transmission rate according to the private signal transmission rate and the public signal transmission rate.

[0079] It should be noted that when the base station decodes the superimposed encoded signal, it will respectively determine the signal-to-interference-plus-noise ratios of the encoded public signal, the encoded private signal, and the encoded signal of the authorized terminal and send them to the unlicensed terminal.

[0080] It should be noted that the private signal transmission rate and the public signal transmission rate can be:

[0081]

[0082] where R k',1 represents the public signal transmission rate, m k',1 represents the public signal data packet length, ε k',1 represents the public signal packet loss rate, γ k',1 represents the public signal-to-interference-plus-noise ratio, R k',2 represents the private signal transmission rate, m k',2 represents the private signal data packet length, ε k',2Indicates the private signal packet loss rate, γ k',2 Indicates the private signal-to-interference-plus-noise ratio.

[0083] It can be understood that the unauthorized terminal signal transmission rate is obtained by adding the private signal transmission rate and the public signal transmission rate, that is, the unauthorized terminal signal transmission rate can be R k' = R k',1 + R k',2 .

[0084] Furthermore, in order to prevent the base station from being overloaded, after the step of determining the unauthorized terminal signal transmission rate according to the private signal transmission rate and the public signal transmission rate, the following steps are further included:

[0085] Determine the access time of the unauthorized terminal according to the unauthorized terminal signal transmission rate and the channel sorting result.

[0086] It can be understood that the unauthorized terminal has a backoff time, that is, each unauthorized terminal has its corresponding access time, rather than accessing the base station simultaneously.

[0087] It should be noted that the backoff time is inversely proportional to the product of the unauthorized terminal signal transmission rate and the channel sorting result, and the access time of the unauthorized terminal can be:

[0088]

[0089] In the formula, a is a constant coefficient, and usually a = 1, R k' represents the unauthorized terminal signal transmission rate, and O k' represents the channel sorting result.

[0090] In this embodiment, the transmission signal corresponding to the target terminal is split into a private signal and a public signal according to the rate splitting factor; the private signal and the public signal are respectively encoded to obtain an unauthorized encoded signal. In this embodiment, the transmission signal corresponding to the target terminal is split into a private signal and a public signal, and after encoding the private signal and the public signal and then adding them for transmission, it ensures that the communication requirements of device differentiation are met when a large number of terminals are accessed.

[0091] Refer to Figure 3 , Figure 3 which is the flowchart of the third embodiment of the unauthorized signal access method of the present invention, and the third embodiment of the unauthorized signal access method of the present invention is proposed.

[0092] Step S10': Receive the preamble before authorization and the authorized signal transmission power sent by the authorized terminal, and receive the preamble before unauthorized access sent by the unauthorized terminal.

[0093] It should be noted that the combined preamble received by the base station and the grant-free preamble can be:

[0094]

[0095] In the formula, where represents the transmit power of the authorized terminal and the grant-free terminal, h k represents the channel coefficients from the authorized terminal and the grant-free terminal to the base station, represents the grant preamble and the grant-free preamble, z p represents the noise corresponding to the base station.

[0096] Step S20': Determine the channel gain according to the grant preamble and the grant-free preamble.

[0097] It should be noted that the combined preamble information is projected onto the complex conjugate of the preamble to obtain

[0098]

[0099] Furthermore, the MMSE estimate of h k can be obtained, that is, the channel gain is:

[0100]

[0101] Step S30': Sort the channel gains and determine the interference threshold according to the channel gains and the transmit power of the grant signal.

[0102] It should be noted that the base station sorts the channel gains from small to large according to the channel state information of the terminal to the base station: and determines the sorting position of the authorized terminal among the channel gains of all terminals. It should be noted that if N = 1, the authorized terminal is the terminal with the weakest channel gain, and if N - 1 = K, the authorized terminal is the terminal with the strongest channel gain.

[0103] It should be noted that the interference threshold is determined according to the channel gain of the authorized terminal and the transmit power of the grant signal. The interference threshold can be:

[0104]

[0105] In the formula, P0 represents the power of the useful signal transmitted by the authorized terminal, represents the communication rate requirement that the authorized terminal needs to meet, represents the channel of the authorized terminal, m0 represents the length of the data packet transmitted by the authorized terminal, and ε0 represents the maximum allowable packet loss rate of the authorized terminal.

[0106] Step S40': Send the channel sorting result and the interference threshold value to the license-free terminal.

[0107] It can be understood that the base station sends the channel sorting result and the interference threshold value to the license-free terminal. The license-free terminal determines the target terminal according to the interference threshold value and estimates the signal transmission rate of the target terminal, and determines the time for the target terminal to access the base station based on the channel sorting result and the signal transmission rate of the target terminal.

[0108] Step S50': Receive the superimposed and encoded signal sent by the license-free terminal to access the license-free terminal.

[0109] It should be noted that after receiving the superimposed and encoded information, the base station uses SIC for decoding, and can decode according to the encoded public signal of the target terminal, the encoded information of the authorized terminal, and the encoded private signal of the target terminal.

[0110] For ease of understanding, refer to Figure 5 for illustration. Figure 5 FIG. is a signaling diagram for the access of the license-free terminal signal. In the figure, the license-free terminal and the authorized terminal randomly select their respective preambles and send them to the base station. The base station estimates the channel gain according to the preambles, sorts the channel gains, and the base station transmits parameters such as the interference threshold value to the license-free terminal and the authorized terminal through calculation. The license-free terminal determines the license-free terminal to be accessed according to the interference threshold value, takes the license-free terminal to be accessed as the target terminal, and encodes the useful signal of the target terminal. At the same time, the authorized terminal encodes the useful signal and superimposes the encoded signal of the target terminal. The target terminal sends the superimposed and encoded signal to the base station, and the authorized terminal sends the encoded signal to the base station. The base station receives the superimposed and encoded signal and the encoded signal and decodes them.

[0111] Furthermore, in order to obtain the signals transmitted by the license-free terminal and the authorized terminal, after step S50' of this embodiment, it further includes:

[0112] Decode in sequence according to the public signal, the authorized coding information, and the private signal in the superimposed and encoded signal.

[0113] It should be noted that the superimposed signal received by the base station from the authorized terminal U0 and the license-free terminal U k' is

[0114]

[0115] where h k' represents the channel coefficient of the license-free terminal, and h 0' represents the channel coefficient of the authorized terminal.

[0116] It is understandable that the base station decodes according to the decoding order of s k',1 →s 0' →s k',2 That is, the encoded public signal of the target terminal, the encoded signal of the authorized terminal, and the encoded private signal of the target terminal, and uses SIC to decode each signal in turn.

[0117] Furthermore, in order to determine the signal transmission rate of the unauthorized terminal, after the step of decoding in sequence according to the public signal, authorized coding information, and private signal in the superimposed encoded signal, the following steps are further included:

[0118] Determine the public signal-to-interference-plus-noise ratio and the private signal-to-interference-plus-noise ratio, and send the public signal-to-interference-plus-noise ratio and the private signal-to-interference-plus-noise ratio to the unauthorized terminal;

[0119] Merge the decoded public signal and the decoded private signal to obtain the signal transmitted by the unauthorized terminal.

[0120] It should be noted that first, under the interference conditions of s k',2 and s 0' decode the s k' signal of the unauthorized terminal U k',1 The signal-to-interference-plus-noise ratio of the base station decoding s k',1 is:

[0121]

[0122] In the formula, N0 is the noise power at the base station side.

[0123] Then the base station eliminates the signal about s k',1 from the superimposed encoded signal and continues to decode s 0' The signal-to-interference-plus-noise ratio of the base station decoding s 0' is:

[0124]

[0125] Similarly, the base station eliminates the signal about s 0' and finally decodes the signal-to-interference-plus-noise ratio of s k',2 is:

[0126]

[0127] It is understandable that when the base station decodes the superimposed encoded information, it determines the signal-to-interference-plus-noise ratio of the private signal and the public signal of the unauthorized terminal, and sends the signal-to-interference-plus-noise ratio of the private signal and the public signal of the authorized terminal to the unauthorized terminal.

[0128] For ease of understanding, refer to Figure 6 for description. Figure 6It is a flowchart for encoding and transmitting terminal signals. In the figure, the license-free terminal divides the short packet W k into parts W k' divides the public signal W k',1 and the private signal W k',2 , and encodes the public signal W k',1 and the private signal W k',2 separately through channel coding to obtain s k',1 and s k',2 . For s k',1 and s k',2 , after power allocation, they are superimposed and sent. The licensed terminal encodes the short packet W0 into s0 and performs power allocation, and directly sends the encoded signal to the base station. The base station receives the superimposed signal y, and decodes the superimposed encoded signals s k',1 , s0 and s k',2 through SIC to obtain the useful signal W0 of the licensed terminal, and combines the decoded private signal and public signal to obtain the useful signal W k' of the license-free terminal.

[0129] In this embodiment, the preamble before authorization and the transmission power of the authorization signal sent by the licensed terminal are received, and the preamble without authorization sent by the license-free terminal is received; the channel gain is determined according to the preamble before authorization and the preamble without authorization; the channel gains are sorted, and the interference threshold value is determined according to the channel gain and the transmission power of the authorization signal; the channel sorting result and the interference threshold value are sent to the license-free terminal; the superimposed encoded signal sent by the license-free terminal is received to access the license-free terminal. In this embodiment, the interference threshold value is determined according to the channel gain and the transmission power of the authorization signal, and the interference threshold value and the channel sorting result are sent to the license-free terminal, so that the license-free terminal can select the target terminal with the signal transmission power less than the interference threshold value, and further adopts the time backoff access method combining the channel gain and the signal rate, so that the base station can maintain a high access performance even when there are few accessed target terminals, that is, when it is in a low load state.

[0130] In addition, an embodiment of the present invention also proposes a storage medium, on which a license-free signal access program is stored. When the license-free signal access program is executed by a processor, the license-free signal access method as described above is implemented.

[0131] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or system comprising that element.

[0132] The serial numbers of the embodiments of the present invention above are only for description and do not represent the superiority or inferiority of the embodiments.

[0133] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a Read Only Memory image (ROM) / Random Access Memory (RAM), magnetic disk, optical disc), and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0134] The above are only the preferred embodiments of the present invention and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for accessing unlicensed signals, characterized in that, Applied to an unlicensed terminal, the unlicensed signal access method includes the following steps: Send an unlicensed preamble to the base station; Receive the channel sorting result and interference threshold value fed back by the base station according to the unlicensed preamble, the licensed preamble of the licensed terminal, and the licensed signal transmission power; Determine the unlicensed signal transmission power according to the power allocation factor and the channel sorting result; Take the unlicensed terminal with the unlicensed signal transmission power less than the interference threshold value as the target terminal; Encode the signal to be transmitted corresponding to the target terminal to obtain an unlicensed encoded signal; Superimpose the licensed encoded signal of the licensed terminal and the unlicensed encoded signal of the unlicensed terminal, and connect the target terminal to the base station based on the superimposed encoded signal; The step of encoding the signal to be transmitted corresponding to the target terminal to obtain an unlicensed encoded signal includes: Divide the transmission signal corresponding to the target terminal into a private signal and a public signal according to the rate splitting factor; Encode the private signal and the public signal respectively to obtain an unlicensed encoded signal; After the step of superimposing the licensed encoded signal of the licensed terminal and the unlicensed encoded signal of the unlicensed terminal, and connecting the target terminal to the base station based on the superimposed encoded signal, it further includes: Receive the private signal-to-interference-plus-noise ratio and the public signal-to-interference-plus-noise ratio sent by the base station; Determine the private signal transmission rate according to the private signal data packet length, the private signal-to-interference-plus-noise ratio, and the private signal packet loss rate; Determine the public signal transmission rate according to the public signal data packet length, the public signal-to-interference-plus-noise ratio, and the public signal packet loss rate; Determine the unlicensed terminal signal transmission rate according to the private signal transmission rate and the public signal transmission rate.

2. The license-free signal access method according to claim 1, wherein After the step of determining the unlicensed terminal signal transmission rate according to the private signal transmission rate and the public signal transmission rate, it further includes: Determine the access time of the unlicensed terminal according to the unlicensed terminal signal transmission rate and the channel sorting result.

3. A method for unauthorized signal access, characterized in that, Applied to a base station, the unlicensed signal access method includes the following steps: Receive the licensed preamble and the licensed signal transmission power sent by the licensed terminal, and receive the unlicensed preamble sent by the unlicensed terminal. The combined received licensed preamble and unlicensed preamble are: In the formula, where represents the transmit power of the authorized terminal and the non - authorized terminal, h k represents the channel coefficients of the authorized terminal and the non - authorized terminal to the base station, represents the authorized preamble and the non - authorized preamble, z p represents the noise corresponding to the base station; Determine the channel gain according to the licensed preamble and the unlicensed preamble. The channel gain is the MMSE estimation. The step of determining the channel gain according to the licensed preamble and the unlicensed preamble includes: Project the preamble for grant and the preamble for license-free onto the complex conjugate of the preamble, to obtain: as follows: By calculating the MMSE estimate of the h k , that is, the channel gain is: Sort the channel gain, and determine the interference threshold value according to the channel gain and the licensed signal transmission power; Send the channel sorting result and the interference threshold value to the unlicensed terminal; Receive the superimposed encoded signal sent by the unlicensed terminal to access the unlicensed terminal; After the step of receiving the superimposed encoded signal sent by the unlicensed terminal to access the unlicensed terminal, it further includes: Decode in sequence according to the public signal, the licensed encoded information, and the private signal in the superimposed encoded signal; After the step of decoding in sequence according to the public signal, the authorized coding information, and the private signal in the superimposed coded signal, the following steps are further included: Determine the public signal-to-interference-plus-noise ratio and the private signal-to-interference-plus-noise ratio, and send the public signal-to-interference-plus-noise ratio and the private signal-to-interference-plus-noise ratio to the unauthorized terminal; Combine the decoded public signal and the decoded private signal to obtain the transmission signal of the unauthorized terminal.

4. An unauthorized signal access system, characterized in that, The unauthorized signal access system includes the terminal as claimed in claim 1 and the base station as claimed in claim 3, and data interaction is performed between the terminal and the base station.

5. A terminal, characterized in that, The terminal includes: a memory, a processor, and an unauthorized signal access program stored on the memory and executable on the processor. When the unauthorized signal access program is executed by the processor, the steps of the unauthorized signal access method as claimed in any one of claims 1 to 3 are implemented.

6. A storage medium, characterized in that, An unauthorized signal access program is stored on the storage medium. When the unauthorized signal access program is executed by a processor, the steps of the unauthorized signal access method as claimed in any one of claims 1 to 3 are implemented.

Images