Broadcast and unicast fusion transmission method and device

Abstract

The invention provides a broadcast and unicast fusion transmission method and device. The broadcast and unicast fusion transmission method comprises the steps that broadcast and unicast adopt power domain non-orthogonal multiplexing meeting a Gray mapping rule to achieve fusion transmission; the non-orthogonal multiplexing base layer bears a physical layer broadcast dedicated channel, and takes a subframe as a resource allocation unit; the non-orthogonal multiplexing enhancement layer bears a physical layer broadcast dedicated channel or bears a physical layer unicast shared channel; when the enhancement layer bears a physical layer broadcast dedicated channel, the subframe is used as a resource allocation unit; and when the enhancement layer bears the physical layer unicast shared channel, a resource block RB is used as a resource allocation unit. In the broadcast and unicast fusion transmission scheme provided by the invention, the NOM base layer adopts a full-bandwidth physical layer broadcast dedicated channel to carry out broadcast service transmission, so that the continuity and the stability of broadcast service transmission are ensured; and the enhancement layer performs unicast service transmission for different users by adopting a physical layer unicast shared channel allocated according to subcarriers or resource blocks.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless broadcast and unicast fusion transmission, and in particular to a broadcast and unicast fusion transmission method and device. Background Art

[0002] Broadcast data transmission service is one of the fastest and most convenient ways for people to obtain multimedia information and content today. Wireless broadcast data transmission technology can use a single time domain and frequency domain resources to provide broadcast data push services with the same content to a large number of users. In the process of distributing real-time broadcast services such as sports event broadcasts, live news broadcasts, and emergency message broadcasts, it has significant advantages such as low cost, high efficiency, and low latency.

[0003] Traditional wireless broadcast transmission technology is mainly used in terrestrial broadcast transmission systems, which are proprietary broadcast transmission systems that use exclusive tower equipment and networks.

[0004] However, the development of wireless broadcast transmission technology is no longer limited to terrestrial broadcast transmission systems. Wireless broadcast transmission technology based on 3GPP mobile communication networks has shown rapid development in the past few years. The internal driving force for the development of broadcast transmission technology in mobile communication systems is the increasing demand for integrated transmission of wireless broadcast and unicast. On the one hand, with the emergence of new multimedia service types such as ultra-high definition and XR, the volume of multimedia services in mobile communication networks is experiencing an exponential growth, which has brought severe challenges to mobile communication systems with limited spectrum resources. At the same time, the transmission of common content in multimedia services accounts for a certain proportion. Therefore, introducing wireless broadcast transmission technology into the original mobile communication system dominated by unicast is of great significance in improving system transmission efficiency and reducing system operating costs. On the other hand, the traditional terrestrial broadcast transmission system, due to the lack of user interactivity and the lack of personalized content push capabilities, has gradually shown a clear development trend in today's development of multimedia service needs. Embracing mobile communication technology, integrating its own technology and network into the mobile communication system, and realizing the integrated transmission of broadcast and unicast is also the only way for the development of terrestrial broadcast technology and systems.

[0005] Compared with traditional orthogonal multiplexing technologies such as TDM, NOM can provide more advantageous system capacity when the multiplexed services have differentiated QoS. However, it is not easy to achieve the fusion transmission of broadcast and unicast based on NOM. Traditional NOM methods, such as the LDM (Layered Division Multiplexing) scheme adopted in ATSC 3.0, must rely on the SIC technology at the codeword level at the receiver to achieve effective decoding of its enhanced layer data. This brings limitations to the processing delay of the two layers of data in LDM, that is, the enhanced layer data must be decoded after the decoding of the base layer data is completed. However, since the two layers of data multiplexed by the LDM technology in the ATSC 3.0 system are both broadcast service data, they can have the same processing delay. Therefore, in ATSC 3.0, the deep time-frequency interleaver set up to ensure the robustness of broadcast data transmission is placed after the LDM multiplexing module, that is, the two layers of LDM data are uniformly interleaved. However, in the unicast and broadcast fusion transmission scenario, this method is obviously unreasonable. From the perspective of physical layer technology, there are obvious technical differences between broadcast and unicast technologies. Broadcast transmission technology, due to its one-way, one-to-many transmission characteristics, must ensure that the broadcast data has extremely high robustness in a single transmission. Therefore, it is often necessary to adopt error correction coding schemes with longer code lengths and deeper time-frequency domain interleaving technology. This will bring inherent processing delays to the parsing and decoding of broadcast data. Unicast transmission, due to its transmission characteristics such as two-way transmission, user-targeted transmission, and error retransmission, does not require the use of deep interleaving and other processing, and needs to avoid large processing delays. It can be seen that the traditional LDM multiplexing method is not suitable for the integrated transmission scenario of broadcast and unicast. Summary of the invention

[0006] In view of the defects in the prior art, an object of the present invention is to provide a broadcast and unicast fusion transmission method and device.

[0007] The broadcast and unicast fusion transmission method provided by the present invention includes:

[0008] Broadcast and unicast use power domain non-orthogonal multiplexing that meets Gray mapping rules to achieve fusion transmission;

[0009] The non-orthogonal multiplexed base layer carries the physical layer broadcast dedicated channel, with subframes as the resource allocation unit;

[0010] The non-orthogonally multiplexed enhancement layer carries a physical layer broadcast dedicated channel, or carries a physical layer unicast shared channel;

[0011] When the enhancement layer carries a physical layer broadcast dedicated channel, the subframe is used as the resource allocation unit;

[0012] When the enhancement layer carries the physical layer unicast shared channel, a resource block RB is used as a resource allocation unit.

[0013] Preferably, the base layer broadcast data bit stream or the enhancement layer broadcast data bit stream is subjected to bit-level processing of the physical layer broadcast dedicated channel, including CRC addition, encoding, rate matching and scrambling, and then constellation mapping processing of the physical layer broadcast dedicated channel is performed, and time-frequency interleaving processing is performed on the mapped symbols;

[0014] Performing bit-level processing of the physical layer unicast shared channel on the enhancement layer unicast data bit stream, including CRC addition, encoding, rate matching and scrambling, and then performing constellation mapping processing of the physical layer unicast shared channel to obtain mapped symbols;

[0015] Performing constellation merging processing that satisfies Gray's rule on the broadcast data symbols of the base layer after time-frequency interleaving processing and the broadcast data symbols of the enhancement layer after time-frequency interleaving processing or the unicast data symbols after constellation mapping processing;

[0016] The combined constellation symbols are processed for OFDM symbol generation to obtain a baseband waveform signal to be transmitted.

[0017] Preferably, the base layer broadcast data bit stream or the enhancement layer broadcast data bit stream is subjected to bit-level processing of a physical layer broadcast dedicated channel, including CRC addition, encoding, rate matching and scrambling, and packet bit interleaving processing;

[0018] Perform bit-level processing of the physical layer unicast shared channel on the enhancement layer unicast data bit stream, including CRC addition, encoding, rate matching and scrambling;

[0019] Performing a joint constellation mapping process satisfying the Gray rule on the broadcast data bit stream of the base layer after the group bit interleaving process and the broadcast data bit stream of the enhancement layer after the group bit interleaving process or the unicast data bit stream after the bit level processing to obtain a mapped symbol;

[0020] The symbols mapped by the joint constellation are processed by OFDM symbol generation to obtain a baseband waveform signal to be transmitted.

[0021] Preferably, the constellation merging process satisfying Gray's rule is implemented by using the mirror inversion of the enhancement layer constellation symbols controlled by the base layer bit stream.

[0022] Preferably, the joint constellation mapping satisfying the Gray rule is achieved by respectively mapping the base layer bit stream and the enhancement layer bit stream to specific bit positions of the combined constellation diagram satisfying the Gray rule.

[0023] Preferably, the time-frequency interleaving process is to perform an interleaving process on the symbols after constellation mapping, across OFDM symbols in time and across multiple subcarriers in frequency;

[0024] The grouped bit interleaving process is to group the bits mapped to a constellation symbol into a group, and implement interleaving between the groups across OFDM symbols in time and across multiple subcarriers in frequency.

[0025] The broadcast and unicast fusion transmission device provided according to the present invention includes a power domain non-orthogonal multiplexer that meets the Gray mapping rule;

[0026] The base layer processing device of the non-orthogonal multiplexer processes the physical layer broadcast dedicated channel and uses the subframe as the resource allocation unit to transmit the broadcast service;

[0027] The enhancement layer processing device of the non-orthogonal multiplexer processes a physical layer broadcast dedicated channel, or processes a physical layer unicast shared channel;

[0028] When the enhancement layer processing device of the non-orthogonal multiplexer processes the physical layer broadcast dedicated channel, the subframe is used as the resource allocation unit for broadcast service transmission;

[0029] When the enhancement layer processing device of the non-orthogonal multiplexer processes the physical layer unicast shared channel, the resource block RB is used as the resource allocation unit to perform unicast service transmission.

[0030] Preferably, the base layer processing device of the non-orthogonal multiplexer comprises a bit-level processing device for a physical layer broadcast dedicated channel, including a CRC adding, encoding, rate matching and scrambling module, a constellation mapping module for a physical layer broadcast dedicated channel, and a time-frequency interleaving module; or comprises a bit-level processing device for a physical layer broadcast dedicated channel, including a CRC adding, encoding, rate matching and scrambling module, and a bit grouping interleaving module;

[0031] An enhancement layer processing device of a non-orthogonal multiplexer, comprising a bit-level processing device for a physical layer broadcast dedicated channel, including a CRC adding, encoding, rate matching and scrambling module, a constellation mapping module for a physical layer broadcast dedicated channel, and a time-frequency interleaving module; or comprising a bit-level processing device for a physical layer broadcast dedicated channel, including a CRC adding, encoding, rate matching and scrambling module, and a bit grouping interleaving module;

[0032] The enhancement layer processing device of the non-orthogonal multiplexer also includes a bit level processing device of the physical layer unicast shared channel, including CRC adding, encoding, rate matching and scrambling modules.

[0033] Preferably, the power domain non-orthogonal multiplexer satisfying the Gray mapping rule is a constellation merging processor satisfying the Gray rule, comprising an enhancement layer constellation symbol mirroring device and a constellation merging device controlled by a base layer bit stream.

[0034] Preferably, the power domain non-orthogonal multiplexer satisfying the Gray mapping rule is a joint constellation mapper satisfying the Gray rule, which is implemented by respectively mapping the base layer bit stream and the enhancement layer bit stream to specific bit positions of a combined constellation diagram satisfying the Gray rule.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The non-orthogonal multiplexing technology used in the present invention is implemented by a multiplexing constellation diagram that satisfies the Gray mapping rule, so that the receiver can use non-SIC technology or symbol-level SIC technology to implement data demodulation and decoding of the enhancement layer without waiting for the decoding of the base layer data to be completed. Therefore, in the broadcast and unicast fusion transmission solution proposed in the present invention, an independent time-frequency interleaver can be set only for the broadcast data stream before the NOM module;

[0037] (2) In the broadcast and unicast integrated transmission scheme proposed in the present invention, the NOM basic layer adopts a full-bandwidth physical layer broadcast dedicated channel (such as PMCH) for broadcast service transmission, so as to ensure the continuity and stability of broadcast service transmission; while the enhancement layer adopts a physical layer unicast shared channel (such as PDSCH) allocated according to subcarriers or resource blocks (RBs) for unicast service transmission for different users. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0039] Figure 1 Schematic diagram of resource allocation and multiplexing for broadcast and unicast converged transmission;

[0040] Figure 2 Example 1 of data processing for broadcast and unicast fusion transmission;

[0041] Figure 3 Example 2 of data processing for broadcast and unicast fusion transmission;

[0042] Figure 4 This is a schematic diagram of the Gray rule constellation diagram overlay;

[0043] Figure 5 Schematic diagram of Gray rule joint constellation mapping. DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] The present invention proposes a new physical layer technology for broadcast and unicast fusion transmission. Different from the traditional 3GPP hybrid broadcast technology, such as eMBMS (evolved Multimedia Broadcast Multicast Service), which uses time division multiplexing (TDM) and other orthogonal multiplexing methods to achieve broadcast and unicast hybrid transmission, the technology proposed in the present invention uses non-orthogonal multiplexing (NOM) to achieve fusion transmission, which can provide a higher system capacity than the traditional orthogonal multiplexing method when there is a large difference in the quality of service (QoS) requirements such as the receiving threshold of the broadcast and unicast services. Among them, the basic layer of NOM is used for the transmission of broadcast service data, and a dedicated physical layer broadcast channel, such as PMCH (Physical Multicast Channel) in 3GPP, is used to realize full-bandwidth dedicated broadcast service transmission; the enhancement layer is used for the transmission of unicast service data, and a shared physical layer unicast channel, such as PDSCH (Physical Downlink Shared Channel) in 3GPP, is used to realize flexible unicast resource allocation and service transmission based on RB (Resource Block). At the same time, the NOM mode in the method proposed by the present invention adopts a combined constellation multiplexing method that satisfies Gray mapping, so that the receiver can ensure the decoding reception quality of the enhanced layer unicast data without using codeword-level serial interference cancellation (Serial Interference Cancellation, SIC). Based on this, the broadcast service data and unicast service data that are integrated and transmitted in the method proposed by the present invention can adopt physical layer coding, interleaving and other technologies with different processing delays. Broadcast services can use interleaving technologies with longer codewords and greater depth to ensure the reliability of their single transmission; unicast services can set independent coding and interleaving processing according to their own delay requirements.

[0046] The broadcast and unicast fusion transmission technology proposed in the present invention can be implemented through the following data processing method.

[0047] First, the transmission system uses subframes as the most basic time-domain transmission unit. Each subframe can use power domain non-orthogonal multiplexing to achieve converged transmission. Among them, the base layer in the non-orthogonal multiplexing is allocated to the physical layer broadcast dedicated channel (such as PMCH) to realize the transmission of broadcast services; the enhancement layer can be allocated to the physical layer broadcast dedicated channel for broadcast service transmission, or it can be allocated to the physical layer unicast shared channel (such as PDSCH) for unicast service transmission. The physical layer broadcast dedicated channel occupies all frequency domain resources of the current subframe. Each unicast shared channel can occupy specific frequency domain resources (such as RB) of the current subframe, that is, the unicast data of different users are allocated and scheduled for transmission resources in units of RB. The above resource allocation and multiplexing method for converged transmission is Figure 1 Among them, in the three-dimensional coordinate axis, t represents the time dimension, f represents the frequency dimension, and p represents the power dimension.

[0048] The present invention mainly focuses on the part of broadcast and unicast fusion, that is, the scenario in which the enhancement layer in the subframe is allocated to unicast service transmission.

[0049] Example 1

[0050] like Figure 2 As shown, the data of the base layer needs to go through the bit-level processing of the physical layer broadcast dedicated channels such as PMCH, including CRC addition, coding, rate matching, scrambling, etc., and then perform constellation mapping processing on channels such as PMCH, and perform time-frequency domain interleaving processing on the constellation mapping symbols; the data of the enhancement layer needs to go through the bit-level processing of the physical layer unicast shared channels such as PDSCH, also including CRC addition, coding, rate matching, scrambling, etc., and then perform constellation mapping processing on channels such as PDSCH. The constellation mapping symbols after interleaving of the base layer and the constellation mapping symbols of the enhancement layer are multiplexed by superimposing the Gray rule constellation diagram. The Gray rule constellation diagram superposition processing is shown in FIG. Figure 3 As shown, it is necessary to use the bits corresponding to the base layer of the current mapping symbol to implement mirror processing on the enhanced layer mapping symbol. The specific mirroring rules are: when the even bit of the base layer bit appears once as '0', the enhanced layer constellation is flipped up and down, that is, the imaginary part of the symbol is inverted; when the odd bit of the base layer bit appears once as '0', the enhanced layer constellation is flipped left and right, that is, the real part of the symbol is inverted. The enhanced layer constellation symbol after mirroring is consistent with the coefficient Multiply by the coefficient The base layer symbols are then superimposed, and finally Gray rule constellation multiplexing is realized. Among them, λ is the power allocation coefficient of power domain non-orthogonal multiplexing. After OFDM generation processing, the fused transmission baseband waveform to be sent is obtained.

[0051] Example 2

[0052] like Figure 4 As shown, the data of the base layer needs to be processed at the bit level by a physical layer broadcast dedicated channel such as PMCH, including CRC addition, encoding, rate matching, scrambling, etc., and then grouped bit interleaving is performed. The group size is the number of bits corresponding to each symbol in its constellation mapping, that is, the order of the constellation diagram. Grouped bit interleaving is equivalent to the time-frequency interleaving performed after the constellation mapping in Example 1. The data of the enhancement layer needs to be processed at the bit level by a physical layer unicast shared channel such as PDSCH, including CRC addition, encoding, rate matching, scrambling, etc. After grouped bit interleaving, the base layer bit stream and the enhancement layer bit stream are jointly constellated according to the Gray rule and mapped to a joint constellation diagram that satisfies the Gray rule, as shown in FIG. Figure 5 As shown in FIG. 1 , the joint constellation diagram is pre-designed according to the power allocation coefficient λ of the non-orthogonal multiplexing in the power domain.

[0053] Example 3

[0054] The present invention provides a method for fusion transmission of broadcast and unicast, comprising: broadcast and unicast adopt power domain non-orthogonal multiplexing that meets Gray mapping rules to realize fusion transmission; its base layer carries a physical layer broadcast dedicated channel, and subframes are used as resource allocation units; its enhancement layer can carry a physical layer broadcast dedicated channel, and can also carry a physical layer unicast shared channel; when the enhancement layer carries a physical layer broadcast dedicated channel, subframes are used as resource allocation units; when the enhancement layer carries a physical layer unicast shared channel, resource blocks RB are used as resource allocation units.

[0055] Perform bit-level processing of the physical layer broadcast dedicated channel on the base layer broadcast data bit stream or the enhancement layer broadcast data bit stream, including CRC addition, encoding, rate matching, scrambling, etc., and then perform constellation mapping processing of the physical layer broadcast dedicated channel, and perform time-frequency interleaving processing on the mapped symbols;

[0056] The enhancement layer unicast data bit stream is subjected to bit-level processing of the physical layer unicast shared channel, including CRC addition, encoding, rate matching, scrambling, etc., and then the constellation mapping processing of the physical layer unicast shared channel is performed to obtain mapped symbols;

[0057] Performing constellation merging processing that satisfies Gray's rule on the broadcast data symbols of the base layer after time-frequency interleaving processing and the broadcast data symbols of the enhancement layer after time-frequency interleaving processing or the unicast data symbols after constellation mapping processing;

[0058] The combined constellation symbols are post-processed such as OFDM symbol generation to obtain a baseband waveform signal to be transmitted.

[0059] Perform bit-level processing of the physical layer broadcast dedicated channel on the base layer broadcast data bit stream or the enhancement layer broadcast data bit stream, including CRC addition, encoding, rate matching, scrambling, etc., and perform packet bit interleaving processing;

[0060] Perform bit-level processing of the physical layer unicast shared channel on the enhancement layer unicast data bit stream, including CRC addition, encoding, rate matching, scrambling, etc.

[0061] Performing a joint constellation mapping process satisfying the Gray rule on the broadcast data bit stream of the base layer after the group bit interleaving process and the broadcast data bit stream of the enhancement layer after the group bit interleaving process or the unicast data bit stream after the bit level processing to obtain a mapped symbol;

[0062] The symbols mapped by the joint constellation are subjected to post-processing such as OFDM symbol generation to obtain a baseband waveform signal to be transmitted.

[0063] Constellation merging processing that meets Gray's rule is achieved by using the enhancement layer constellation symbol mirror inversion controlled by the base layer bit stream;

[0064] The joint constellation mapping satisfying the Gray rule is achieved by respectively mapping the base layer bit stream and the enhancement layer bit stream to specific bit positions of the combined constellation diagram satisfying the Gray rule.

[0065] The time-frequency interleaving process is to perform an interleaving process on the symbols after constellation mapping, spanning OFDM symbols in time and across multiple subcarriers in frequency;

[0066] The grouped bit interleaving process is to group the bits mapped to a constellation symbol into a group, and implement interleaving between the groups across OFDM symbols in time and across multiple subcarriers in frequency.

[0067] The present invention provides a broadcast and unicast fusion transmission device, comprising a power domain non-orthogonal multiplexer that meets the Gray mapping rule; its basic layer processing device processes a physical layer broadcast dedicated channel, and uses a subframe as a resource allocation unit to transmit broadcast services; its enhanced layer processing device can process a physical layer broadcast dedicated channel, and can also process a physical layer unicast shared channel; when its enhanced layer processing device processes a physical layer broadcast dedicated channel, it uses a subframe as a resource allocation unit to transmit broadcast services; when its enhanced layer processes a physical layer unicast shared channel, it uses a resource block RB as a resource allocation unit to transmit unicast services.

[0068] Its basic layer processing device includes a bit-level processing device for a physical layer broadcast dedicated channel, including CRC adding, encoding, rate matching, scrambling and other modules, a constellation mapping module for a physical layer broadcast dedicated channel, and a time-frequency interleaving module; or includes a bit-level processing device for a physical layer broadcast dedicated channel, including CRC adding, encoding, rate matching, scrambling and other modules, and a bit grouping interleaving module;

[0069] The enhancement layer processing device thereof comprises a bit-level processing device for a physical layer broadcast dedicated channel, including modules such as CRC addition, coding, rate matching, scrambling, etc., a constellation mapping module for a physical layer broadcast dedicated channel, and a time-frequency interleaving module; or comprises a bit-level processing device for a physical layer broadcast dedicated channel, including modules such as CRC addition, coding, rate matching, scrambling, etc., and a bit grouping interleaving module;

[0070] The enhanced layer processing device also includes a bit-level processing device for a physical layer unicast shared channel, including modules such as CRC adding, encoding, rate matching, and scrambling.

[0071] A power domain non-orthogonal multiplexer satisfying Gray mapping rules is a constellation merging processor satisfying Gray rules, comprising an enhancement layer constellation symbol mirror device and a constellation merging device controlled by a base layer bit stream; or,

[0072] A power domain non-orthogonal multiplexer that satisfies the Gray mapping rule is a joint constellation mapper that satisfies the Gray rule, which is achieved by respectively mapping the base layer bit stream and the enhancement layer bit stream to specific bit positions of a combined constellation diagram that satisfies the Gray rule.

[0073] Those skilled in the art know that, in addition to implementing the system, device and its various modules provided by the present invention in a purely computer-readable program code, it is entirely possible to implement the same program in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers and embedded microcontrollers by logically programming the method steps. Therefore, the system, device and its various modules provided by the present invention can be considered as a hardware component, and the modules included therein for implementing various programs can also be considered as structures within the hardware component; the modules for implementing various functions can also be considered as both software programs for implementing the method and structures within the hardware component.

[0074] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A broadcast and unicast fusion transmission method, characterized in that: include: Broadcast and unicast use power domain non-orthogonal multiplexing that meets Gray mapping rules to achieve fusion transmission; The non-orthogonal multiplexed base layer carries the physical layer broadcast dedicated channel, with subframes as the resource allocation unit; The non-orthogonally multiplexed enhancement layer carries a physical layer broadcast dedicated channel, or carries a physical layer unicast shared channel; When the enhancement layer carries the physical layer broadcast dedicated channel, the subframe is used as the resource allocation unit; When the enhancement layer carries the physical layer unicast shared channel, a resource block RB is used as a resource allocation unit.

2. The broadcast and unicast fusion transmission method according to claim 1, characterized in that: Perform bit-level processing of the physical layer broadcast dedicated channel on the base layer broadcast data bit stream or the enhancement layer broadcast data bit stream, including CRC addition, encoding, rate matching and scrambling, and then perform constellation mapping processing of the physical layer broadcast dedicated channel, and perform time-frequency interleaving processing on the mapped symbols; Performing bit-level processing of the physical layer unicast shared channel on the enhancement layer unicast data bit stream, including CRC addition, encoding, rate matching and scrambling, and then performing constellation mapping processing of the physical layer unicast shared channel to obtain mapped symbols; Performing constellation merging processing that satisfies Gray's rule on the broadcast data symbols of the base layer after time-frequency interleaving processing and the broadcast data symbols of the enhancement layer after time-frequency interleaving processing or the unicast data symbols after constellation mapping processing; The combined constellation symbols are processed for OFDM symbol generation to obtain a baseband waveform signal to be transmitted.

3. The broadcast and unicast fusion transmission method according to claim 2, characterized in that: Perform bit-level processing of the physical layer broadcast dedicated channel on the base layer broadcast data bit stream or the enhancement layer broadcast data bit stream, including CRC addition, encoding, rate matching and scrambling, and packet bit interleaving processing; Perform bit-level processing of the physical layer unicast shared channel on the enhancement layer unicast data bit stream, including CRC addition, encoding, rate matching and scrambling; Performing a joint constellation mapping process satisfying the Gray rule on the broadcast data bit stream of the base layer after the group bit interleaving process and the broadcast data bit stream of the enhancement layer after the group bit interleaving process or the unicast data bit stream after the bit level processing to obtain a mapped symbol; The symbols mapped by the joint constellation are processed by OFDM symbol generation to obtain a baseband waveform signal to be transmitted.

4. The broadcast and unicast fusion transmission method according to claim 2, characterized in that: The constellation merging process that meets Gray's rule is achieved by using the mirror inversion of the enhancement layer constellation symbols controlled by the base layer bit stream.

5. The broadcast and unicast fusion transmission method according to claim 3, characterized in that: The joint constellation mapping satisfying the Gray rule is achieved by respectively mapping the base layer bit stream and the enhancement layer bit stream to specific bit positions of the combined constellation diagram satisfying the Gray rule.

6. The broadcast and unicast fusion transmission method according to claim 3, characterized in that: The time-frequency interleaving process is to perform an interleaving process on the symbols after constellation mapping, spanning OFDM symbols in time and across multiple subcarriers in frequency; The grouped bit interleaving process is to group the bits mapped to one constellation symbol into one group, and implement interleaving process across OFDM symbols in time and across multiple subcarriers in frequency between the groups.

7. A broadcast and unicast fusion transmission device, characterized in that: It includes a power domain non-orthogonal multiplexer that satisfies Gray mapping rules; The base layer processing device of the non-orthogonal multiplexer processes the physical layer broadcast dedicated channel and uses the subframe as the resource allocation unit to transmit the broadcast service; The enhancement layer processing device of the non-orthogonal multiplexer processes a physical layer broadcast dedicated channel, or processes a physical layer unicast shared channel; When the enhancement layer processing device of the non-orthogonal multiplexer processes the physical layer broadcast dedicated channel, the subframe is used as the resource allocation unit for broadcast service transmission; When the enhancement layer processing device of the non-orthogonal multiplexer processes the physical layer unicast shared channel, the resource block RB is used as the resource allocation unit to perform unicast service transmission.

8. The broadcast and unicast fusion transmission device according to claim 7, characterized in that: A base layer processing device of a non-orthogonal multiplexer, comprising a bit-level processing device for a physical layer broadcast dedicated channel, including a CRC adding, encoding, rate matching and scrambling module, a constellation mapping module for a physical layer broadcast dedicated channel, and a time-frequency interleaving module; or comprising a bit-level processing device for a physical layer broadcast dedicated channel, including a CRC adding, encoding, rate matching and scrambling module, and a bit grouping interleaving module; An enhancement layer processing device of a non-orthogonal multiplexer, comprising a bit-level processing device for a physical layer broadcast dedicated channel, including a CRC adding, encoding, rate matching and scrambling module, a constellation mapping module for a physical layer broadcast dedicated channel, and a time-frequency interleaving module; or comprising a bit-level processing device for a physical layer broadcast dedicated channel, including a CRC adding, encoding, rate matching and scrambling module, and a bit grouping interleaving module; The enhancement layer processing device of the non-orthogonal multiplexer also includes a bit level processing device of the physical layer unicast shared channel, including CRC adding, encoding, rate matching and scrambling modules.

9. The broadcast and unicast fusion transmission device according to claim 7, characterized in that: A power domain non-orthogonal multiplexer that meets the Gray mapping rule is a constellation diagram merging processor that meets the Gray rule, comprising an enhancement layer constellation symbol mirror device and a constellation diagram merging device controlled by a base layer bit stream.

10. The broadcast and unicast fusion transmission device according to claim 7, characterized in that: A power domain non-orthogonal multiplexer satisfying the Gray mapping rule is a joint constellation mapper satisfying the Gray rule, which is achieved by respectively mapping the base layer bit stream and the enhancement layer bit stream to specific bit positions of a combined constellation diagram satisfying the Gray rule.

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