阅读说明：本技术 非正交多址接入方法、终端和通信系统 (Non-orthogonal multiple access method, terminal and communication system ) 是由 蔡博文 谢伟良 于 2020-03-16 设计创作，主要内容包括：本公开提供一种非正交多址接入方法、终端和通信系统。NOMA终端在利用非授权频段接入的情况下,根据预设的带宽优先级从大到小的顺序,依次使用基站所配备的带宽资源集合中的每个带宽资源进行CCA检测,直到CCA检测成功为止；在基站设置的发送时刻发送上行数据。本公开通过给NOMA终端配置多个带宽资源,以便NOMA终端可利用多个带宽资源进行CCA检测,并在CCA检测成功后,在基站配置的传输时刻进行上行数据传输,由此可解决NOMA用户在非授权频段有效避免CCA冲突,以进行非正交多址接入的问题。(The disclosure provides a non-orthogonal multiple access method, a terminal and a communication system. When the access is carried out by using the unauthorized frequency band, the NOMA terminal sequentially uses each bandwidth resource in a bandwidth resource set equipped by the base station to carry out CCA detection according to the sequence of the preset bandwidth priority from large to small until the CCA detection is successful; and transmitting the uplink data at the transmission time set by the base station. According to the method, the NOMA terminal is configured with the plurality of bandwidth resources, so that the NOMA terminal can utilize the plurality of bandwidth resources to carry out CCA detection, and uplink data transmission is carried out at the transmission moment configured by the base station after the CCA detection is successful, so that the problem that a NOMA user effectively avoids CCA conflict in an unauthorized frequency band to carry out non-orthogonal multiple access can be solved.)

1. A non-orthogonal multiple access method, comprising:

under the condition of utilizing the unauthorized frequency band for access, sequentially using each bandwidth resource in a bandwidth resource set equipped by a base station to perform CCA (clear channel assessment) detection according to a preset sequence of bandwidth priorities from large to small until CCA detection is successful;

and transmitting the uplink data at the transmission time set by the base station.

2. The method of claim 1, wherein,

in the bandwidth resource set, the priority of each bandwidth resource and the corresponding CCA detection success probability are in positive correlation.

3. The method of claim 1, wherein,

in the bandwidth resource set, the priority of each bandwidth resource is fixedly set.

4. A non-orthogonal multiple access terminal, comprising:

the detection module is configured to sequentially use each bandwidth resource in a bandwidth resource set equipped by the base station to perform CCA (clear channel assessment) according to a preset order of bandwidth priority from large to small under the condition of utilizing the unlicensed frequency band for access until CCA detection is successful;

and the transmitting module is configured to transmit the uplink data at the transmitting time set by the base station.

5. The terminal of claim 4, wherein,

in the bandwidth resource set, the priority of each bandwidth resource and the corresponding CCA detection success probability are in positive correlation.

6. The terminal of claim 4, wherein,

in the bandwidth resource set, the priority of each bandwidth resource is fixedly set.

7. A non-orthogonal multiple access terminal, comprising:

a memory configured to store instructions;

a processor coupled to the memory, the processor configured to perform implementing the method of any of claims 1-3 based on instructions stored by the memory.

8. A communication system comprising a plurality of non-orthogonal multiple access terminals according to any of claims 4-7, and:

a base station configured to allocate a bandwidth resource set by using a non-orthogonal multiple access terminal accessed by an unlicensed frequency band, where the bandwidth resource set includes multiple bandwidth resources and sets a bandwidth priority for each bandwidth resource; and configuring the time for transmitting the uplink data for the plurality of non-orthogonal multiple access terminals after the plurality of non-orthogonal multiple access terminals all successfully complete the CCA detection.

9. The system of claim 8, wherein,

the base station is further configured to dynamically adjust the priority of each bandwidth resource in the bandwidth resource set, so that the priority of each bandwidth resource and the corresponding CCA detection success probability have a positive correlation.

10. The system of claim 8, wherein,

the base station is further configured to set a priority of each bandwidth resource in the set of bandwidth resources to a fixed value.

11. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1-3.

Technical Field

The present disclosure relates to the field of communications, and in particular, to a non-orthogonal multiple access method, a terminal, and a communication system.

Background

When accessing an unlicensed frequency band, a UE (User Equipment) needs to perform CCA (clear channel assessment), such as Listen Before Talk (LBT), to determine whether the unlicensed channel is idle. The UE can successfully access the unlicensed frequency band for transmission only when the channel detection indicates that the unlicensed channel is idle.

Disclosure of Invention

The inventor finds, through research, that a NOMA (Non-Orthogonal Multiple Access) technology transmits Multiple information streams on channels with overlapping time/frequency domains at different powers, and provides wireless services for Multiple users simultaneously on the same wireless resource. However, applying NOMA to the unlicensed frequency band may not share the time-frequency resource for access due to the need to perform CCA.

Accordingly, the present disclosure provides a non-orthogonal multiple access scheme, which can effectively solve the problem of multiple user access when NOMA is applied to an unlicensed frequency band.

According to a first aspect of the embodiments of the present disclosure, there is provided a non-orthogonal multiple access method, including: under the condition of utilizing the unauthorized frequency band for access, sequentially using each bandwidth resource in a bandwidth resource set equipped by a base station to perform CCA (clear channel assessment) detection according to a preset sequence of bandwidth priorities from large to small until CCA detection is successful; and transmitting the uplink data at the transmission time set by the base station.

In some embodiments, in the bandwidth resource set, the priority of each bandwidth resource and the corresponding CCA detection success probability are in a positive correlation.

In some embodiments, the priority of each bandwidth resource in the set of bandwidth resources is fixedly set.

According to a second aspect of the embodiments of the present disclosure, there is provided a non-orthogonal multiple access terminal, including: the detection module is configured to sequentially use each bandwidth resource in a bandwidth resource set equipped by the base station to perform CCA (clear channel assessment) according to a preset order of bandwidth priority from large to small under the condition of utilizing the unlicensed frequency band for access until CCA detection is successful; and the transmitting module is configured to transmit the uplink data at the transmitting time set by the base station.

In some embodiments, in the bandwidth resource set, the priority of each bandwidth resource and the corresponding CCA detection success probability are in a positive correlation.

In some embodiments, the priority of each bandwidth resource in the set of bandwidth resources is fixedly set.

According to a third aspect of the embodiments of the present disclosure, there is provided a non-orthogonal multiple access terminal, including: a memory configured to store instructions; a processor coupled to the memory, the processor configured to perform a method implementing any of the embodiments described above based on instructions stored by the memory.

According to a fourth aspect of the embodiments of the present disclosure, there is provided a communication system, including the non-orthogonal multiple access terminal according to any of the embodiments above, and: a base station configured to allocate a bandwidth resource set by using a non-orthogonal multiple access terminal accessed by an unlicensed frequency band, where the bandwidth resource set includes multiple bandwidth resources and sets a bandwidth priority for each bandwidth resource; and configuring the time for transmitting the uplink data for the plurality of non-orthogonal multiple access terminals after the plurality of non-orthogonal multiple access terminals all successfully complete the CCA detection.

In some embodiments, the base station is further configured to dynamically adjust the priority of each bandwidth resource in the set of bandwidth resources, so that the priority of each bandwidth resource is in positive correlation with the corresponding CCA detection success probability.

In some embodiments, the base station is further configured to set the priority of each bandwidth resource of the set of bandwidth resources to a fixed value.

According to a fifth aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, in which computer instructions are stored, and when executed by a processor, the computer-readable storage medium implements the method according to any of the embodiments described above.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

fig. 1 is a flow diagram of a non-orthogonal multiple access method according to one embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a non-orthogonal multiple access terminal according to one embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a non-orthogonal multiple access terminal according to another embodiment of the present disclosure;

FIG. 4 is a schematic block diagram of a communication system according to one embodiment of the present disclosure;

fig. 5 is a schematic diagram of multiple NOMA terminal access, according to one embodiment of the present disclosure.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials and values set forth in these embodiments are to be construed as illustrative only and not as limiting unless otherwise specifically stated.

The use of the word "comprising" or "comprises" and the like in this disclosure means that the elements listed before the word encompass the elements listed after the word and do not exclude the possibility that other elements may also be encompassed.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

Fig. 1 is a flow diagram of a non-orthogonal multiple access method according to one embodiment of the present disclosure. In some embodiments, the following non-orthogonal multiple access method steps are performed by a NOMA terminal.

In step 101, under the condition of using the unlicensed frequency band for access, according to a preset order from a large bandwidth priority to a small bandwidth priority, each bandwidth resource in a bandwidth resource set equipped by a base station is sequentially used for CCA detection for idle channels until CCA detection is successful.

In some embodiments, the base station allocates a plurality of available bandwidth resources, e.g., N bandwidths, i.e., bandwidth 1 to bandwidth N, to NOMA terminals supporting unlicensed frequency band access.

When the NOMA terminal accesses in the unlicensed frequency band, for example, CCA detection is firstly performed in bandwidth 1, and if successful, data is transmitted at a time preset by the base station. If it fails, detection continues on bandwidth 2, and so on.

In some embodiments, in the set of bandwidth resources, the priority of each bandwidth resource and the corresponding CCA detection success probability are in a positive correlation. For example, if the success rate of CCA detection performed by the NOMA terminal on the bandwidth 1 is the highest, the priority of the bandwidth 1 is set to be the highest, and if the success rate of CCA detection performed by the NOMA terminal on the bandwidth 4 is the lowest, the priority of the bandwidth 4 is set to be the lowest.

In other embodiments, the priority of each bandwidth resource in the set of bandwidth resources is fixedly set.

In step 102, uplink data is transmitted at the transmission timing set by the base station.

Here, in order to enable a plurality of NOMA terminals to transmit uplink data at the same time, after CCA detection is successful, a NOMA terminal needs to wait for the base station to allocate a uniform uplink data transmission time.

In the non-orthogonal multiple access method provided in the foregoing embodiment of the present disclosure, multiple bandwidth resources are configured for the NOMA terminal, so that the NOMA terminal can perform CCA detection using the multiple bandwidth resources, and after the CCA detection is successful, uplink data transmission is performed at a transmission time configured by the base station, thereby solving a problem that a NOMA user effectively avoids CCA collision in an unlicensed frequency band to perform non-orthogonal multiple access.

Fig. 2 is a schematic structural diagram of a non-orthogonal multiple access terminal according to one embodiment of the present disclosure. As shown in fig. 2, the NOMA terminal includes a detection module 21 and a transmission module 22.

The detecting module 21 is configured to, under the condition of utilizing the unlicensed frequency band for access, sequentially use each bandwidth resource in a bandwidth resource set equipped by the base station to perform CCA for idle channel detection according to a preset order from a large bandwidth priority to a small bandwidth priority until the CCA is detected successfully.

In some embodiments, the base station allocates a plurality of available bandwidth resources, e.g., N bandwidths, i.e., bandwidth 1 to bandwidth N, to NOMA terminals supporting unlicensed frequency band access.

When the NOMA terminal accesses in the unlicensed frequency band, for example, CCA detection is firstly performed in bandwidth 1, and if successful, data is transmitted at a time preset by the base station. If it fails, detection continues on bandwidth 2, and so on.

In some embodiments, in the set of bandwidth resources, the priority of each bandwidth resource and the corresponding CCA detection success probability are in a positive correlation. For example, if the success rate of CCA detection performed by the NOMA terminal on the bandwidth 1 is the highest, the priority of the bandwidth 1 is set to be the highest, and if the success rate of CCA detection performed by the NOMA terminal on the bandwidth 4 is the lowest, the priority of the bandwidth 4 is set to be the lowest.

In other embodiments, the priority of each bandwidth resource in the set of bandwidth resources is fixedly set.

The transmission module 22 is configured to transmit uplink data at a transmission timing set by the base station.

Here, in order to enable a plurality of NOMA terminals to transmit uplink data at the same time, after CCA detection is successful, a NOMA terminal needs to wait for the base station to allocate a uniform uplink data transmission time.

Fig. 3 is a schematic structural diagram of a non-orthogonal multiple access terminal according to another embodiment of the present disclosure. As shown in fig. 3, the NOMA terminal includes a memory 31 and a processor 32.

The memory 31 is used to store instructions. The processor 32 is coupled to the memory 31. The processor 32 is configured to perform a method as referred to in any of the embodiments of fig. 1 based on the instructions stored by the memory.

As shown in fig. 3, the NOMA terminal also includes a communication interface 33 for information interaction with other devices. The NOMA terminal also includes a bus 34, and the processor 32, communication interface 33, and memory 31 communicate with each other via the bus 34.

The Memory 31 may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM). Such as at least one disk storage. The memory 31 may also be a memory array. The storage 31 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules.

Further, the processor 32 may be a central processing unit, or may be an ASIC (Application Specific Integrated Circuit), or one or more Integrated circuits configured to implement embodiments of the present disclosure.

The present disclosure also provides a computer-readable storage medium. The computer-readable storage medium stores computer instructions, and the instructions, when executed by the processor, implement the method according to any one of the embodiments in fig. 1.

Fig. 4 is a schematic structural diagram of a communication system according to one embodiment of the present disclosure. As shown in fig. 4, the communication system includes a base station 41 and a plurality of NOMA terminals 421, 422, …, 42 m. The NOMA terminals 421-42m are non-orthogonal multiple access terminals to which any of the embodiments of fig. 2 or fig. 3 relate.

The base station 41 is configured to allocate a bandwidth resource set including a plurality of bandwidth resources by using a NOMA terminal accessed by an unlicensed frequency band, and set a bandwidth priority for each bandwidth resource. The base station 41 is further configured to configure a time instant for transmitting uplink data for a plurality of non-orthogonal multiple access terminals in case that all of the plurality of NOMA terminals successfully complete CCA detection.

In some embodiments, the base station 41 is further configured to dynamically adjust the priority of each bandwidth resource in the set of bandwidth resources, so that the priority of each bandwidth resource is in positive correlation with the corresponding CCA detection success probability.

In some embodiments, the base station 41 is further configured to set the priority of each bandwidth resource in the set of bandwidth resources to a fixed value.

Fig. 5 is a schematic diagram of multiple NOMA terminal access, according to one embodiment of the present disclosure.

As shown in fig. 5, there are three NOMA terminals, UE1, UE2, and UE3, accessing the network. Wherein UE1, UE2, and UE3 perform CCA detection according to the embodiment shown in fig. 1, respectively. The UE1 successfully completes the CCA detection at time t1, and the UE2 successfully completes the CCA detection at time t 2. Since the UE3 has not yet successfully completed the CCA detection at this point, the UE1 and UE2 need to continue waiting. If the UE3 successfully completes CCA detection at time t3, the base station may configure the UE1, the UE2, and the UE3 to transmit uplink data together at time t 3.

By implementing the scheme disclosed by the invention, the problem that the NOMA user effectively avoids CCA conflict in an unauthorized frequency band to perform non-orthogonal multiple access can be solved by configuring a plurality of bandwidth resources and uniform transmission time for the NOMA terminal.

In some embodiments, the functional modules may be implemented as a general purpose Processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other Programmable Logic device, discrete Gate or transistor Logic, discrete hardware components, or any suitable combination thereof, for performing the functions described in this disclosure.

So far, embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.