Uplink non-orthogonal multiple access transmission method and system

Abstract

The present invention provides a transmission method for uplink non-orthogonal multiple access, comprising: performing bit-level interleaving processing on the terminal service information after channel coding by means of shifting; then performing constellation modulation to map the bit information into symbol information according to different modulation modes; and performing symbol-level sequence expansion to multiplex the modulation symbols of M users on K subcarriers after undergoing extended sequence processing, where M>K; and performing scrambling processing on the expanded data to distinguish different base stations. The present invention introduces non-orthogonal multiple access based on the time domain, frequency domain, and spatial domain, bringing new diversity gain. Through reasonable resource mapping and multiplexing, and adjusting the power and user combination between terminals, more users can be accessed simultaneously on the same time / frequency / spatial domain resources, thereby increasing system capacity and system throughput, reducing user scheduling waiting time, and adopting a new scrambling method to enhance system security and improve user experience.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communication and broadcasting, and in particular relates to an uplink non-orthogonal multiple access transmission method and system. Background Art

[0002] In traditional wireless communications, uplink user access often uses orthogonal multiple access (OMA) technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA), and space division multiple access (SDMA). These OMA methods essentially divide the channel bandwidth / symbol resources into multiple orthogonal sub-channels, each of which occupies a portion of the multiple access channel's resources for signal transmission.

[0003] These orthogonal multiple access technologies can function normally when the number of users being scheduled is small. However, as the number of users increases, such as in a two-way broadcast system, due to the large coverage area and large number of users, problems such as insufficient resources may arise, resulting in a significant reduction in scheduling effectiveness or even inability to schedule, thereby reducing network capacity and system throughput, reducing user scheduling delay, and significantly increasing system delay, worsening user experience.

[0004] Based on the above problems, it is necessary to provide a transmission solution that can transmit the information of multiple users on the same time-frequency and space resources, increase system capacity and system throughput, and reduce user scheduling delay. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide an uplink non-orthogonal multiple access (NOMA) transmission scheme, which can transmit the information of multiple users on the same time-frequency and spatial resources, increase system capacity and system throughput, reduce user scheduling delay, increase transmission security, and improve user experience.

[0006] The present invention provides an uplink non-orthogonal multiple access (NOMA) transmission method, comprising: performing bit-level interleaving processing on terminal UE service information after channel coding in a shifting manner;

[0007] Perform constellation modulation on the interleaved service information and map the bit information into symbol information according to different modulation modes;

[0008] Perform symbol-level sequence expansion on the modulated symbols. After the modulated symbols of M users are processed by the expansion sequence, they are multiplexed on K subcarriers, where M>K.

[0009] The expanded data is scrambled to distinguish different base stations.

[0010] More preferably, the method further comprises:

[0011] The data of different users that have undergone non-orthogonal multiple access processing are resource multiplexed in the same time domain and / or frequency domain and / or space domain.

[0012] More preferably, the transmission method further includes:

[0013] Before the resource multiplexing, gain adjustment or power control is performed on the scrambled data.

[0014] The present invention also provides an uplink non-orthogonal multiple access (NOMA) transmission system, comprising:

[0015] An interleaving unit is used to perform bit-level interleaving of the terminal UE service information after channel coding in a shifting manner;

[0016] The modulation unit is used to perform constellation modulation on the interleaved service information and map the bit information into symbol information according to different modulation modes;

[0017] The expansion unit is used to perform symbol-level sequence expansion on the modulated symbols. After the modulated symbols of M users are processed by the expansion sequence, they are multiplexed on K subcarriers, where M>K;

[0018] The scrambling unit is used to scramble the expanded data to distinguish different base stations.

[0019] More preferably, the transmission system further comprises:

[0020] The multiplexing unit is used to perform resource multiplexing on the data of different users that have undergone non-orthogonal multiple access processing by the aforementioned units in the same time domain and / or frequency domain and / or spatial domain.

[0021] More preferably, the transmission system further comprises:

[0022] The power control unit performs gain adjustment or power control on the scrambled data.

[0023] To sum up, the present invention introduces non-orthogonal multiple access based on the time domain, frequency domain, and spatial domain, bringing new diversity gain. Through reasonable resource mapping and multiplexing, and adjustment of power and user combinations between terminals, more users can be accessed simultaneously on the same time / frequency / spatial domain resources, thereby improving system capacity and system throughput, reducing user scheduling waiting time, and adopting a new scrambling method to enhance system security and improve user experience.

[0024] To achieve the above and related ends, one or more embodiments include the features hereinafter described in detail and particularly pointed out in the claims. The following description and the drawings set forth certain illustrative aspects in detail and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other advantages and novel features will become apparent from the following detailed description considered in conjunction with the drawings, and the disclosed embodiments are intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the transmission principle of uplink NOMA provided by an embodiment of the present invention;

[0026] Figure 2 This is a flow chart of an uplink NOMA transmission method provided by an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of the scrambling process in the transmission method provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the area division used when performing user grouping in the transmission method provided by an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of an uplink NOMA transmission system architecture provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following description and the accompanying drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process and other changes. The examples represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The scope of the embodiments of the present invention includes the entire scope of the claims, and all available equivalents of the claims. In this article, these embodiments of the present invention may be referred to individually or collectively by the term "invention", which is merely for convenience and is not intended to automatically limit the scope of the application to any single invention or inventive concept if more than one invention is in fact disclosed.

[0031] Reference Figure 1 and Figure 2 , an embodiment of the present invention provides an uplink NOMA transmission method, including:

[0032] S202, performing bit-level interleaving processing on the terminal UE service information after channel coding by using a shifting method;

[0033] S204, constellation modulation is performed on the interleaved service information, and bit information is mapped into symbol information according to different modulation modes;

[0034] S206, performing symbol-level sequence spreading on the modulated symbols, and multiplexing the modulated symbols of M users on K subcarriers after the spreading sequence processing, where M>K;

[0035] S208: The expanded data is scrambled to distinguish different base stations.

[0036] Specifically, the present invention provides a more secure physical layer scrambling method, which can not only distinguish base stations but also make communications more secure and reliable.

[0037] The terminal side scrambling sequence is a pseudo-random sequence, which is seeded by the base station's MAC address or other unique ID of the base station. There are multiple selection patterns for terminal scrambling. The terminal obtains the index value of the scrambling pattern based on the local secret key generated by the authentication when joining the network, and selects the scrambling sequence based on the index. Figure 3 The schematic diagram of the scrambling process is shown.

[0038] If the local secret key of user k is calculated (various calculation methods can be used, such as modulo calculation), the index value index of the scrambled pattern is obtained.

[0039] For example, if index=1, the pseudo-random sequence generates a sequence in which values ​​are continuously taken starting from the Lth sample point and scrambled with the generated data sequence.

[0040] For example, if index = 2, in the sequence generated by the pseudo-random sequence, starting from the initial sample point, a value is taken every J sample points to obtain a sequence, which is scrambled with the data sequence.

[0041] More preferably, the transmission method further includes:

[0042] S210 , performing resource multiplexing on the data of different users that have undergone non-orthogonal multiple access processing in steps S202 to S208 in the same time domain and / or frequency domain and / or spatial domain.

[0043] Specifically, in the embodiment of the present invention, different user data processed by non-orthogonal multiple access are multiplexed in the same time / frequency / space domain. For example, data of four users are transmitted in a superimposed manner in a certain subband of a certain OFDM symbol.

[0044] For example, an OFDM symbol has N subcarriers, divided into M subbands, numbered subband 1, ..., subband M. For example, subband i has K subcarriers, numbered 0, 1, ..., K. The K subcarriers in subband i simultaneously carry data for two users (for example, one user in area A and one user in area C in the above steps), achieving resource reuse.

[0045] Preferably, the transmission method further includes:

[0046] S209: Before resource multiplexing in step S210, perform gain adjustment or power control on the scrambled data.

[0047] Preferably, the bit-level interleaving process in S202 is performed by shifting the interleaved bits, and the number of shifted bits is related to the user k, for example:

[0048] Shift

[0049] Where k is the kth user, N is the number of interleaved bits, and M is the total number of users. To round up.

[0050] Preferably, the spreading sequence used for performing symbol-level sequence spreading on the modulated symbols in step S206 is a complex short sequence.

[0051] In a specific embodiment of the transmission method, the design of the spreading sequence is based on criteria including WBE (welch-bound equality) and GWBE (generalized welch-bound equality);

[0052] Preferably, the selection of the spreading sequence is determined through negotiation with the base station, and the base station allocates sequence resources.

[0053] Before S210 resource reuse, the following steps are also included:

[0054] According to the distance measurement threshold and the path loss threshold, the distance and the loss are combined and divided into four areas: (long distance, large loss), (long distance, small loss), (short distance, large loss), and (short distance, small loss). (Long distance, large loss) and (short distance, small loss) are divided into one scheduling group, and (long distance, small loss) and (short distance, large loss) are divided into another scheduling group.

[0055] The embodiment of the present invention provides a method for quickly combining users;

[0056] According to the distance measurement threshold and the path loss threshold, the entire interval can be divided into four quadrants: A, B, C, and D. Figure 4 shown.

[0057] During specific scheduling, the system can be divided into two scheduling groups (A, C) and (B, D) based on distance. This allows for dynamic power allocation within each scheduling group based on the user's SINR, service urgency, and other factors. For example, when scheduling users, one user can be selected in area A and one in area C, allowing two users to be scheduled simultaneously in the same time / frequency domain.

[0058] Reference Figure 5 , an embodiment of the present invention further provides an uplink NOMA transmission system 500, including:

[0059] The interleaving unit 51 is configured to perform bit-level interleaving on the channel-coded terminal UE service information in a shifting manner;

[0060] The modulation unit 52 is used to perform constellation modulation on the interleaved service information and map the bit information into symbol information according to different modulation modes;

[0061] An expansion unit 53 is configured to perform symbol-level sequence expansion on the modulated symbols, and multiplex the modulated symbols of M users on K subcarriers after being processed by the expansion sequence, where M>K;

[0062] The scrambling unit 54 is configured to perform scrambling processing on the expanded data to distinguish different base stations.

[0063] The transmission system also includes:

[0064] The multiplexing unit 56 is configured to perform resource multiplexing on the data of different users that have undergone non-orthogonal multiple access processing by the aforementioned units in the same time domain and / or frequency domain and / or spatial domain.

[0065] The transmission system further includes:

[0066] The power control unit 55 performs gain adjustment or power control on the scrambled data.

[0067] To sum up, the present invention introduces non-orthogonal multiple access based on the time domain, frequency domain, and spatial domain, bringing new diversity gain. Through reasonable resource mapping and multiplexing, and adjustment of power and user combinations between terminals, more users can be accessed simultaneously on the same time / frequency / spatial domain resources, thereby improving system capacity and system throughput, reducing user scheduling waiting time, and adopting a new scrambling method to enhance system security and improve user experience.

[0068] It will be appreciated by those skilled in the art that the various exemplary method steps and device units described herein in conjunction with the disclosed embodiments can be implemented in electronic hardware, software, or a combination of the two. In order to clearly illustrate the interchangeability between hardware and software, the various exemplary steps and units are generally described above in terms of their functionality. Whether this functionality is implemented in hardware or software depends on the design constraints implemented by the specific application and the entire system. Those skilled in the art can implement the described functionality in a variety of ways for each specific application, but the results of such implementation should not be interpreted as departing from the scope of the present invention.

[0069] The steps of the method described in conjunction with the above-disclosed embodiments may be directly embodied as hardware, a software module executed by a processor, or a combination of the two. The software module may exist in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A typical storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative embodiment, the storage medium is an integral part of the processor. The processor and the storage medium may exist in an ASIC. The ASIC may exist in a user station. In an alternative embodiment, the processor and the storage medium may exist as discrete components in the user station.

[0070] According to the disclosed embodiments, it is possible for those skilled in the art to implement or use the present invention. Various modifications to these embodiments are obvious to those skilled in the art, and the overall principles defined herein can also be applied to other embodiments without departing from the scope and purpose of the present invention. The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A transmission method for uplink non-orthogonal multiple access, characterized in that: include: The UE service information after channel coding is interleaved at the bit level by using a shifting method; Perform constellation modulation on the interleaved service information and map the bit information into symbol information according to different modulation modes; Perform symbol-level sequence expansion on the modulated symbols. After the modulated symbols of M users are processed by the expansion sequence, they are multiplexed on K subcarriers, where M>K. The expanded data is scrambled to distinguish different base stations; Among them, when scrambling the expanded data, the terminal-side scrambling sequence is a pseudo-random sequence, with the base station's MAC address or other type of unique ID of the base station as the sequence seed. The terminal obtains the index value index of the scrambling pattern based on the local secret key generated by authentication when joining the network, selects the corresponding sampling method for sampling according to the index value index, and performs scrambling operation based on the sampled scrambling sequence and the generated data sequence.

2. The transmission method according to claim 1, wherein: Also includes: The data of different users that have undergone non-orthogonal multiple access processing are resource multiplexed in the same time domain and / or frequency domain and / or space domain.

3. The transmission method according to claim 2, wherein: Also includes: Before the resource multiplexing, gain adjustment or power control is performed on the scrambled data.

4. The transmission method according to claim 1, wherein: The bit-level interleaving process specifically includes: The interleaved bits are shifted, and the number of shifted bits is related to user k. Among them, the shift Where k is the kth user, N is the number of interleaved bits, and M is the total number of users. To round up.

5. The transmission method according to claim 1, wherein: The spreading sequence used for performing symbol-level sequence spreading on the modulated symbols is a complex short sequence.

6. The transmission method according to claim 5, wherein: The design of the extended sequence is based on the criteria including WBE (welch-bound equality) and GWBE (generalized welch-bound equality); The selection of the extended sequence is determined through negotiation with the base station, and the base station allocates sequence resources.

7. The transmission method according to claim 2, wherein: Before the resource reuse, the following steps are also included: According to the distance measurement threshold and the path loss threshold, the distance and the loss are combined to form four areas: (long distance, large loss), (long distance, small loss), (short distance, large loss), and (short distance, small loss). (Long distance, large loss) and (short distance, small loss) are grouped in one scheduling group, and (long distance, small loss) and (short distance, large loss) are grouped in another scheduling group.

8. An uplink non-orthogonal multiple access transmission system, characterized in that: include: An interleaving unit is used to perform bit-level interleaving of the terminal UE service information after channel coding in a shifting manner; The modulation unit is used to perform constellation modulation on the interleaved service information and map the bit information into symbol information according to different modulation modes; The expansion unit is used to perform symbol-level sequence expansion on the modulated symbols. After the modulated symbols of M users are processed by the expansion sequence, they are multiplexed on K subcarriers, where M>K; A scrambling unit, used to scramble the expanded data to distinguish different base stations; Among them, when scrambling the expanded data, the terminal-side scrambling sequence is a pseudo-random sequence, with the base station's MAC address or other type of unique ID of the base station as the sequence seed. The terminal obtains the index value index of the scrambling pattern based on the local secret key generated by authentication when joining the network, selects the corresponding sampling method for sampling according to the index value index, and performs scrambling operation based on the sampled scrambling sequence and the generated data sequence.

9. The transmission system according to claim 8, wherein: Also includes: The multiplexing unit is used to perform resource multiplexing on the data of different users that have undergone non-orthogonal multiple access processing by the aforementioned units in the same time domain and / or frequency domain and / or spatial domain.

10. The transmission system according to claim 9, wherein: Also includes: The power control unit performs gain adjustment or power control on the scrambled data.

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