CN106688299A

CN106688299A - Communication method, terminal device, and base station

Info

Publication number: CN106688299A
Application number: CN201480079687.0A
Authority: CN
Inventors: 张朝阳; 王献斌; 张昱; 张舜卿
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-11-04
Filing date: 2014-11-04
Publication date: 2017-05-17
Anticipated expiration: 2034-11-04
Also published as: WO2016070323A1; CN106688299B

Abstract

Disclosed are a communication method, a terminal device, and a base station. The method comprises: receiving system state information from a base station, the system state information comprising at least one of the total number of users and the total access degree of time-frequency resources; determining access degree probability distribution information according to the system state information, the access degree probability distribution information being used for indicating a probability or probabilities when data is separately sent according to one or more access degrees; and separately sending, according to the access degree probability distribution information, to-be-sent data to the base station by using one or more access degrees and a corresponding probability or probabilities. Embodiments of the present invention can improve the system efficiency and reduce the system complexity.

Description

Communication method, terminal equipment and base station

Technical Field

The present invention relates to the field of communications, and in particular, to a communication method, a terminal device, and a base station.

Background

With the development of technologies such as internet of things, internet of vehicles, ad hoc networks and the like, cell densification is a trend of future networks. Massive Access (english) is one of the typical scenarios of future networks. The large-scale access scene has the following characteristics: firstly, the number of potential access users is large and dynamic; secondly, the access network structure is complex, the topology is changeable, and the channel characteristics are dynamically changed; thirdly, the service types are complex, and the access data volume and the time delay requirements of different users are obviously different.

In a large-scale access scenario, a series of problems may be caused if the system employs a centrally controlled access mechanism. For example, the system may spend a lot of signaling resources to transmit information about the access mode of the user, which reduces the system efficiency. In another example, the base station needs to jointly optimize access parameters of a very large number of users, and the complexity is very high.

Therefore, in a large-scale access scenario, a communication method based on a new access mechanism is needed in the system, so as to solve the problems of low system efficiency, high complexity and the like.

Disclosure of Invention

The embodiment of the invention provides a communication method, terminal equipment and a base station, which can improve the system efficiency and reduce the system complexity.

In a first aspect, an embodiment of the present invention provides a communication method, including:

receiving system state information from a base station, wherein the system state information comprises at least one of the total number of users and the total access degree of time-frequency resources;

determining access degree probability distribution information according to the system state information, wherein the access degree probability distribution information is used for indicating corresponding probabilities when data are respectively transmitted according to one or more specific access degrees;

and respectively sending the data to be sent to the base station according to the access degree probability distribution information and the specific access degree or degrees and the corresponding probability.

With reference to the first aspect, in a first implementation manner of the first aspect, the determining access degree probability distribution information according to the system state information includes:

determining the target average access degree according to the system state information;

and determining the probability distribution information of the access degrees according to the target average access degrees.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a second implementation manner of the first aspect, respectively sending data to be sent to a base station with a specific one or more access degrees and corresponding probabilities according to access degree probability distribution information, includes:

determining the access degree d when the data is sent according to the access degree probability distribution information, wherein the d is a non-negative integer;

d symbols are selected from data to be transmitted for linear addition, and the result after the linear addition is transmitted to a base station.

With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, after respectively sending data to be sent to a base station with a specific one or more access degrees and corresponding probabilities according to access degree probability distribution information, the method further includes:

receiving feedback information from the base station, wherein the feedback information is used for indicating the base station to successfully decode data to be sent;

and adjusting the access degree probability distribution information according to the data volume sent at the moment of receiving the feedback information.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the adjusting the access degree probability distribution information according to the amount of data that has been sent at the time when the feedback information is received includes:

if the sent data volume is larger than a preset threshold value, increasing the probability corresponding to a first access degree in the access degree probability distribution information, wherein the first access degree is larger than the target average access degree;

and if the sent data volume is smaller than a preset threshold value, reducing the probability corresponding to the first access degree in the access degree probability distribution information, wherein the first access degree is larger than the target average access degree.

With reference to the first aspect and the foregoing implementation manner, in a fifth implementation manner of the first aspect, the data to be transmitted is encoded by using a fixed-rate precoding.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a sixth implementation manner of the first aspect, the system state information includes a signal-to-noise ratio SNR.

In a second aspect, an embodiment of the present invention provides a communication method, including:

sending system state information to the terminal equipment so that the terminal equipment can determine the probability distribution information of the access degrees according to the system state information, wherein the system state information comprises at least one of the total number of users and the total access degrees of the time-frequency resources;

and receiving data sent by the terminal equipment according to the access degree probability distribution information, wherein the access degree probability distribution information is used for indicating the corresponding probability when the terminal equipment sends the data respectively with one or more specific access degrees.

With reference to the second aspect, in a first implementation manner of the second aspect, after receiving data sent by the terminal device according to the access degree probability distribution information, the method further includes:

and when the data sent by the terminal equipment is decoded successfully, sending feedback information to the terminal equipment.

With reference to the second aspect and the foregoing implementation manner of the second aspect, in a second implementation manner of the second aspect, the system state information includes a signal-to-noise ratio SNR.

In a third aspect, an embodiment of the present invention provides a terminal device, including:

with reference to the third aspect, in a first implementation manner of the third aspect, the receiving unit is configured to receive system state information from a base station, where the system state information includes at least one of a total number of users and a total number of accesses of time-frequency resources;

a determining unit, configured to determine, according to the system state information, access degree probability distribution information, where the access degree probability distribution information is used to indicate corresponding probabilities when data is sent with a specific one or multiple access degrees, respectively;

and the sending unit is used for sending the data to be sent to the base station according to the access degree probability distribution information and the specific access degree or the specific access degrees and the corresponding probabilities.

With reference to the third aspect, in a first implementation manner of the third aspect, the determining unit is specifically configured to,

With reference to the third aspect and the foregoing implementation manner of the third aspect, in a second implementation manner of the third aspect, the sending unit is specifically configured to,

With reference to the third aspect and the foregoing implementation manner of the third aspect, in a third implementation manner of the third aspect, the receiving unit is further configured to receive feedback information from the base station, where the feedback information is used to instruct the base station to successfully decode data to be transmitted;

the determining unit is further configured to adjust the access degree probability distribution information according to the amount of data that has been sent at the time when the feedback information is received.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in a fourth implementation manner of the third aspect, the determining unit is specifically configured to,

With reference to the third aspect and the foregoing implementation manner of the third aspect, in a fifth implementation manner of the third aspect, the data to be transmitted is encoded by using precoding with a fixed code rate.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in a sixth implementation manner of the third aspect, the system state information includes a signal-to-noise ratio SNR.

In a fourth aspect, an embodiment of the present invention provides a base station, including:

the system comprises a sending unit, a receiving unit and a sending unit, wherein the sending unit is used for sending system state information to the terminal equipment so that the terminal equipment can determine the probability distribution information of access degrees according to the system state information, and the system state information comprises at least one of the total number of users and the total access degrees of time-frequency resources;

and the receiving unit is used for receiving data sent by the terminal equipment according to the access degree probability distribution information, and the access degree probability distribution information is used for indicating the corresponding probability when the terminal equipment sends the data respectively with one or more specific access degrees.

With reference to the fourth aspect, in a first implementation manner of the fourth aspect, the sending unit is further configured to send feedback information to the terminal device when the data sent by the terminal device is successfully decoded.

With reference to the fourth aspect and the foregoing implementation manner of the fourth aspect, in a second implementation manner of the fourth aspect, the system state information includes a signal-to-noise ratio SNR.

Based on the technical scheme, in the embodiment of the invention, the terminal equipment determines the probability distribution information of the access degrees according to the system state information. And then, the terminal equipment sends data to the base station according to the access degree probability distribution information. In this way, the base station does not need to allocate access resources to each terminal device or indicate a specific access mode of each terminal device. Therefore, the embodiment of the invention can improve the system efficiency and reduce the system complexity.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 illustrates a wireless communication system to which an embodiment of the present invention is applicable.

Fig. 2 is a schematic flow chart of a communication method of one embodiment of the present invention.

Fig. 3 is a schematic flow chart of a communication method of another embodiment of the present invention.

Fig. 4 is a schematic flow chart of a communication method of another embodiment of the present invention.

Fig. 5 is a schematic block diagram of a terminal device of one embodiment of the present invention.

Fig. 6 is a schematic block diagram of a base station of one embodiment of the present invention.

Fig. 7 is a schematic block diagram of a terminal device of another embodiment of the present invention.

Fig. 8 is a schematic block diagram of a base station of another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Moreover, various aspects or features of the invention may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard Disk, floppy Disk, magnetic strips, etc.), optical disks (e.g., CD (Compact Disk), DVD (Digital Versatile Disk), etc.), smart cards, and flash Memory devices (e.g., EPROM (Erasable Programmable Read-Only Memory), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, for example: global System for Mobile communications (GSM) System, Code Division Multiple Access (CDMA) System, Wideband Code Division Multiple Access (WCDMA) System, General Packet Radio Service (GPRS), Long Term Evolution (LTE) System, Frequency Division Duplex (FDD) System, Time Division Duplex (TDD) System, Universal Mobile Telecommunications System (UMTS) System, Worldwide Interoperability for Microwave Access (WiMAX) System, and so on.

It should also be understood that, in the embodiment of the present invention, a Terminal device may be referred to as a User Equipment (UE), and may also be referred to as a Terminal (Terminal), a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), or the like. Alternatively, the terminal device may be a sensor node, an automobile, or other device accessing a communication network, or an apparatus on which a communication network can be accessed for communication. The terminal device may communicate with one or more core networks via a Radio Access Network (RAN), for example, the user device may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, and the like, for example, the user device may also be a portable, pocket, handheld, computer-embedded, or vehicle-mounted mobile device, which exchanges voice and/or data with the RAN.

In the embodiment of the present invention, the Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, or an evolved Node B (ENB or e-NodeB) in LTE, which is not limited in the present invention.

Fig. 1 illustrates a wireless communication system to which an embodiment of the present invention is applicable. The wireless communication system 100 includes a base station 102, and the base station 102 can include multiple antenna groups. Each antenna group can include one or more antennas, e.g., one antenna group can include

antennas

104 and 106, another antenna group can include

antennas

108 and 110, and an additional group can include

antennas

112 and 114. 2 antennas are shown in fig. 1 for each antenna group, however, more or fewer antennas may be utilized for each group. Base station 102 can additionally include a transmitter chain and a receiver chain, each of which can be implemented as a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as will be appreciated by one skilled in the art.

Base station 102 may communicate with one or more user devices, such as access terminal 116 and access terminal 122. However, it can be appreciated that base station 102 can communicate with any number of access terminals similar to

access terminals

116 or 122. The

access terminals

116 and 122 can be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over the wireless communication system 100. As depicted, access terminal 116 is in communication with

antennas

112 and 114, where

antennas

112 and 114 transmit information to access terminal 116 over forward link 118 and receive information from access terminal 116 over reverse link 120. In addition, access terminal 122 is in communication with

antennas

104 and 106, where

antennas

104 and 106 transmit information to access terminal 122 over forward link 124 and receive information from access terminal 122 over reverse link 126. In an FDD (Frequency Division Duplex) system, forward link 118 may utilize a different Frequency band than that used by reverse link 120, and forward link 124 may utilize a different Frequency band than that used by reverse link 126, for example. Further, in a TDD (Time Division Duplex) system, forward link 118 and reverse link 120 can utilize a common frequency band and forward link 124 and reverse link 126 can utilize a common frequency band.

Each group of antennas and/or the area in which they are designed to communicate is referred to as a sector of base station 102. For example, antenna groups can be designed to communicate to access terminals in a sector of the areas covered by base station 102. During communication of base station 102 with

access terminals

116 and 122 over

forward links

118 and 124, respectively, the transmitting antennas of base station 102 can utilize beamforming to improve signal-to-noise ratio of

forward links

118 and 124. Moreover, while base station 102 utilizes beamforming to transmit to access

terminals

116 and 122 scattered randomly through an associated coverage, mobile devices in neighboring cells can be subject to less interference as compared to a base station transmitting through a single antenna to all its access terminals.

Base station 102, access terminal 116, or access terminal 122 can be a wireless communication transmitting device and/or a wireless communication receiving device at a given time. When sending data, the wireless communication sending device may encode the data for transmission. Specifically, the wireless communication transmitting device may obtain (e.g., generate, receive from other communication devices, or save in memory, etc.) a number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to produce multiple code blocks. Further, the wireless communication transmitting apparatus may encode each code block using an encoder (not shown).

It should be understood that the wireless communication system 100 in fig. 1 is only an example, and the communication system to which the embodiment of the present invention is applicable is not limited thereto.

In a large scale access scenario, the number of terminal devices (e.g., access terminal 116 or access terminal 122) communicating with access base station 102 is large and dynamically changing. A series of problems arise if the system employs a centrally controlled access mechanism. For example, the system may spend a lot of signaling resources to transmit information about the access mode of the user, which reduces the system efficiency. In another example, the base station needs to jointly optimize access parameters of a very large number of users, and the complexity is very high.

The embodiment of the invention provides a communication method, which can improve the system efficiency and reduce the system complexity. The communication method of the embodiment of the present invention is described in detail below. It should be noted that these examples are only for helping those skilled in the art to better understand the embodiments of the present invention, and do not limit the scope of the embodiments of the present invention.

Fig. 2 is a schematic flow chart of a communication method of one embodiment of the present invention. The method of fig. 2 may be performed by a terminal device, such as access terminal 116 or access terminal 122 shown in fig. 1.

And 201, receiving system state information from the base station, wherein the system state information comprises at least one of the total number of users and the total access degree of the time-frequency resources.

For example, the total number of users represents the total number of terminal devices accessing the base station in the current communication system, and the total access degree of the time-frequency resource refers to the total access degree of the time-frequency resource in the current system or the total access degree of the time-frequency resource averaged within a preset time period. The total number of access degrees of the time-frequency resources in the system reflects the size of the system load (usually, the channel quality is poor when the load is greater than a preset value), such as the total number of data symbols carried on the time-frequency resources of the system.

And 202, determining access degree probability distribution information according to the system state information, wherein the access degree probability distribution information is used for indicating corresponding probabilities when data are respectively transmitted by one or more specific access degrees.

For example, the access degree probability distribution information includes one or more specific access degrees and corresponding probabilities. And the terminal equipment transmits data to the base station according to the indicated specific access degree and the corresponding probability. Specifically, the access degree probability distribution information may be represented in a table form, or may be represented by a functional expression, which is not limited in the embodiment of the present invention. E.g. access degree distribution function

Wherein d is the access degree, p_dN is the length of the coded bits, for the corresponding probability.

And 203, respectively sending the data to be sent to the base station according to the access degree probability distribution information and the specific access degree or degrees and the corresponding probability.

For example, the probability distribution information of access degrees includes three access degrees d₁,d₂,d₃The corresponding probability is p₁,p₂,p₃. Wherein p is₁+p₂+p ₃1. Thus, the terminal device respectively uses the three access degrees d₁,d₂,d₃And transmitting data to the base station, wherein the number of times of transmitting the data at each access degree is determined according to the corresponding probability.

Suppose that the terminal device sends 10 times data, p, to the base station₁0.3, the terminal device has access degree d in 10 times₁The number of times of transmitting data is 3, and the position of the 3 times in 10 transmissions is not limited. In addition, if one of the three access degrees is zero, it indicates that the terminal device does not transmit data.

Optionally, as an embodiment, when determining the probability distribution information of the access degrees according to the system state information, the target average access degrees may be determined according to the system state information. And then, determining the probability distribution information of the access degrees according to the target average access degrees.

For example, the terminal device may obtain the current system load according to the system state information. In combination with a preset system load threshold, the terminal device may determine the current available average access degree, i.e. the target average access degree. Specifically, the terminal device may subtract the current system load value (i.e. the total number of accesses of the frequency resource) from the system load threshold, and use the difference as the target average number of accesses, or use a number of accesses smaller than the difference as the target average number of accesses in combination with the requirement of the decoding complexity. Then, the terminal device may determine the access degree probability distribution information according to the target average access degree. Wherein, M access degrees and their corresponding probabilities included in the access degree probability distribution information satisfy the following two conditions:

and under the condition one, solving the product of each access degree in the M access degrees and the corresponding probability thereof to obtain M products, wherein the sum of the M products is equal to the target average access degree.

And under the second condition, the sum of the probabilities is equal to 1.

For another example, the terminal device may divide the total number of users by a preset system load threshold, and use a corresponding quotient as the target average access degree. Or, the terminal device may divide the total access degree of the time-frequency resource by the total number of the users, and use the corresponding quotient as the target average access degree. It is to be understood that such variations are intended to fall within the scope of the present invention.

In addition, when determining the access degree probability distribution information, the terminal device may further determine the access degree probability distribution information according to other factors such as Signal to Noise Ratio (SNR), data transmission requirements, and the like. And (4) assuming that the channel gains of all users are the same, and obtaining the iteration performance of the extrinsic information. With the increase of the total access degree of the time-frequency resource block, the convergence point of the average external information quickly approaches to saturation. When the total access degree of the time-frequency resource block is infinite, the convergence point of the external information is progressive performance, and the access probability corresponding to the external information convergence point reaching 99% of the progressive performance is called a saturation point. When the access probability (i.e. the probability corresponding to the access degree) is less than the saturation point, the access probability is increased, the external information convergence point is raised, and the system performance is increased. When the access probability is higher than the saturation point, the access probability is increased, the external information convergence point is basically unchanged, but the complexity of the system is continuously increased. Therefore, the target average access degree can be determined according to the saturation point, and then the access degree probability distribution information can be determined according to the target average access degree.

In order to describe the embodiments of the present invention more clearly, the foregoing method for determining the probability distribution information of the access degrees is illustrated below, and it should be understood that the scope of the embodiments of the present invention is not limited thereto. Assuming that the target average access degree is 3, the following two kinds of information may be used as the access degree probability distribution information in the embodiment of the present invention:

the first information comprises four access degrees of 0,2,4 and 6, and the corresponding probabilities are 0.3,0.2,0.2 and 0.3 respectively;

the second type of information includes an access degree of 3, corresponding to a probability of 1.

Specifically, when the number of users accessing the system is small, the second information may be selected as the access degree probability distribution information. When the number of users accessing the system is large, the first information can be selected as the probability distribution information of the access degrees.

Optionally, as another embodiment, when sending data to be sent to the base station according to the access degree probability distribution information and with a specific one or more access degrees and corresponding probabilities, the terminal device may first determine, according to the access degree probability distribution information, the access degrees d when sending the data this time, where d is a non-negative integer. Then, d symbols are selected from the data to be transmitted for linear addition, and the result after the linear addition is transmitted to the base station.

For example, the terminal device encodes data by using a Low Density Parity Check Code (LDPC for short), so as to obtain encoded bits. The coded bits are then symbol mapped to obtain a series of modulation symbols. And the terminal equipment determines the access degree d when the data is sent according to the access degree probability distribution information. Then, d symbols are selected from the aforementioned modulation symbols and linearly added. And finally, the symbols after the linear addition are sent to a base station through time-frequency resources occupied by the system. And the terminal equipment repeats the process of determining the access degree and transmitting the modulation symbols with corresponding lengths until the data transmission is finished.

Optionally, as another embodiment, after respectively sending data to be sent to the base station according to the access degree probability distribution information and with a specific access degree or a plurality of access degrees and corresponding probabilities, the terminal device receives feedback information from the base station, where the feedback information is used to instruct the base station to successfully decode the data to be sent. Then, the terminal device adjusts the access degree probability distribution information according to the amount of data that has been transmitted at the time when the feedback information is received.

For example, after the base station can correctly decode the data sent by the terminal device, that is, after the base station successfully decodes the data sent by the terminal device, the base station sends feedback information to the terminal device. The feedback information may be acknowledgement information. In this way, the terminal device may determine the current channel quality condition (e.g., better or worse) based on the time of arrival of the feedback information. In general, if the time when the feedback information arrives is later, for example, the amount of data already sent when the feedback information arrives is greater than a preset threshold, it indicates that the channel quality is poor. Conversely, if the time when the feedback information arrives is earlier, for example, the amount of data already sent when the feedback information arrives is less than the preset threshold, it indicates that the channel quality is better. Furthermore, the terminal device may adjust the access point probability distribution information according to the channel quality condition.

Optionally, as another embodiment, when the access frequency degree probability distribution information is adjusted according to the amount of data that has been sent at the time when the feedback information is received, if the amount of data that has been sent is greater than a preset threshold, the probability corresponding to the first access frequency degree in the access frequency degree probability distribution information is increased, where the first access frequency degree is greater than the target average access frequency degree. And if the sent data volume is smaller than a preset threshold value, reducing the probability corresponding to the first access degree in the access degree probability distribution information, wherein the first access degree is larger than the target average access degree.

Therefore, the adjustment process of the access degree probability distribution information can be completed quickly. The foregoing adjustment of the number of accesses greater than the target average number of accesses may be referred to as coarse adjustment. Fine-tuning may also be used when the amount of data sent does not differ much from a preset threshold. For example, a smaller number of accesses other than 0 in the access number probability distribution information is adjusted.

Taking the first information described above as an example, the access degree probability distribution information includes four access degrees 0,2,4, and 6, and the corresponding probabilities are 0.3,0.2,0.2, and 0.3, respectively. If the amount of data transmitted is greater than the preset threshold, the probability corresponding to the number of access degrees 6 or 4 may be increased. Specifically, the access degree probability distribution information may be adjusted to: the access degrees are 0,2,4 and 6, the corresponding probabilities are 0.2,0.1,0.3 and 0.4 respectively, or the corresponding probabilities are 0.2,0.2,0.2 and 0.4 respectively, or the corresponding probabilities are 0.2,0.2,0.3 and 0.3 respectively. That is, in order to ensure that the total probability is 1, when increasing the probability corresponding to one or a few access degrees, it is necessary to simultaneously decrease the probabilities corresponding to other access degrees. It should be understood that equivalents of the foregoing embodiments are intended to fall within the scope of the embodiments of the invention.

Similarly, if the sent data amount is smaller than the preset threshold, the method for adjusting the access degree probability distribution information may refer to the foregoing method, and is not described herein again in order to avoid repetition.

It should also be understood that the adjustment amount of the probability corresponding to the first access degree number may be adaptively adjusted according to the degree of the transmitted data amount varying with the adjustment amount.

Optionally, as another embodiment, the data to be transmitted is encoded by using a fixed-rate precoding. Thus, under the condition that the length of the data to be transmitted is determined, the length of the coded bits is determined, and the decoding complexity of the base station side can be reduced.

Optionally, as another embodiment, the system state information includes a signal-to-noise ratio, SNR.

Fig. 3 is a schematic flow chart of a communication method of another embodiment of the present invention. The method of fig. 3 may be performed by a base station, such as base station 102 shown in fig. 1.

301, sending system state information to a terminal device, so that the terminal device determines access degree probability distribution information according to the system state information, where the system state information includes at least one of a total number of users and a total access degree of time-frequency resources.

And 302, receiving data sent by the terminal device according to the access degree probability distribution information, where the access degree probability distribution information is used to indicate corresponding probabilities when the terminal device sends data with a specific one or multiple access degrees respectively.

In this way, the base station receives the data transmitted by the terminal device according to the access degree probability distribution information. Namely, a distributed communication system is formed, and the base station is not required to allocate communication resources or access modes to each terminal device.

Optionally, as an embodiment, when the data sent by the terminal device is successfully decoded, sending feedback information to the terminal device.

Optionally, as another embodiment, the system state information includes a signal-to-noise ratio SNR.

Fig. 4 is a schematic flow chart of a communication method of another embodiment of the present invention. The communication method of the embodiment of the present invention is further described below with reference to fig. 4. It should be noted that these examples are only for helping those skilled in the art to better understand the embodiments of the present invention, and do not limit the scope of the embodiments of the present invention.

As shown in fig. 4, UE 1, UE 2, …, UE M access the base station for communication. Data to be transmitted of UE 1 is

Length of K₁And inputting the bits into an encoder to be encoded to obtain encoded bits. Carrying out symbol mapping on the coded bits to obtain a series of modulation symbols

The adaptive adjuster generates or adjusts access degree probability distribution information according to system state information transmitted from the base station side. The degree generator determines the degree d of the current transmission according to the probability distribution information of the access degree₁The data selector MUX selects from the modulation symbols

In selection of d₁And inputting the symbols into an adder sigma to perform linear addition, and finally transmitting the symbols to a channel time frequency resource block. The degree generator repeats the above process until the data to be transmitted is successfully transmitted

Similarly, the data to be transmitted of UE M is

Length of K_MAnd inputting the bits into a code to be coded to obtain coded bits. The coded bits are symbol mapped to obtain a series of modulation symbols

Length N_MA bit. The adaptive adjuster generates or adjusts access degree probability distribution information according to system state information transmitted from the base station side. The degree generator determines the degree d of the current transmission according to the probability distribution information of the access degree_MThe data selector MUX selects from the modulation symbols

In selection of d_MAnd inputting the symbols into an adder sigma to perform linear addition, and finally transmitting the symbols to a channel time frequency resource block. The degree generator repeats the process until the modulation symbols are successfully transmitted

And the base station acquires the system state information and sends the system state information to each UE. And the base station demodulates the data received from the UE to obtain demodulation information corresponding to each time-frequency resource block. Then, a unified factor graph (e.g., Tanner graph) is formed according to the check relationship of the encoder, the linear addition relationship of each UE access process and the linear superposition relationship of the channels, and iterative multi-user detection decoding is performed on the factor graph. When the base station successfully decodes the message of one UE, an acknowledgement message is sent to the UE. At the same time, the current received sequence for that user is eliminated from the factor graph. Therefore, the base station carries out iterative decoding based on a factor graph, and does not need complex multi-user detection and SISO decoder iterative process, thereby reducing the system complexity, namely the decoding complexity.

Fig. 5 is a schematic block diagram of a terminal device of one embodiment of the present invention. The terminal device 50 in fig. 5 includes a receiving unit 501, a determining unit 502, and a transmitting unit 503.

A receiving unit 501, configured to receive system state information from a base station, where the system state information includes at least one of a total number of users and a total number of accesses of time-frequency resources.

A determining unit 502, configured to determine, according to the system state information, access degree probability distribution information, where the access degree probability distribution information is used to indicate corresponding probabilities when data is sent with a specific one or multiple access degrees respectively.

For example, the access degree probability distribution information includes one or more specific access degrees and corresponding probabilities. And the terminal equipment transmits data to the base station according to the indicated specific access degree and the corresponding probability. Specifically, the access degree probability distribution information may be represented in a table form, or may be represented by a functional expression. E.g. access degree distribution function

A sending unit 503, configured to send data to be sent to the base station according to the access degree probability distribution information and with a specific access degree or multiple access degrees and corresponding probabilities.

Suppose that the terminal device sends 10 times data, p, to the base station₁0.3, the terminal device has access degree d in 10 times₁The number of times of transmitting data is 3, and theThe positions of 3 times in 10 transmissions are not limited. In addition, if one of the three access degrees is zero, it indicates that the terminal device does not transmit data.

Optionally, as an embodiment, the determining unit 502 is specifically configured to determine the target average access degree according to the system state information. And then, determining the probability distribution information of the access degrees according to the target average access degrees.

And under the second condition, the sum of the probabilities is equal to 1.

In addition, when determining the access degree probability distribution information, the terminal device may also determine the access degree probability distribution information by combining other factors such as signal-to-noise ratio (SNR) and data transmission requirements. And (4) assuming that the channel gains of all users are the same, and obtaining the iteration performance of the extrinsic information. With the increase of the total access degree of the time-frequency resource block, the convergence point of the average external information quickly approaches to saturation. When the total access degree of the time-frequency resource block is infinite, the convergence point of the external information is progressive performance, and the access probability corresponding to the external information convergence point reaching 99% of the progressive performance is called a saturation point. When the access probability (i.e. the probability corresponding to the access degree) is less than the saturation point, the access probability is increased, the external information convergence point is raised, and the system performance is increased. When the access probability is higher than the saturation point, the access probability is increased, the external information convergence point is basically unchanged, but the complexity of the system is continuously increased. Therefore, the target average access degree can be determined according to the saturation point, and then the access degree probability distribution information can be determined according to the target average access degree.

Optionally, as another embodiment, the sending unit 503 is specifically configured to determine the access degree d when data is sent this time according to the access degree probability distribution information. D symbols are selected from data to be transmitted for linear addition, and the result after the linear addition is transmitted to a base station.

For example, the terminal device encodes data by using a low density parity check code LDPC to obtain encoded bits. The coded bits are then symbol mapped to obtain a series of modulation symbols. And the terminal equipment determines the access degree d when the data is sent according to the access degree probability distribution information. Then, d symbols are selected from the aforementioned modulation symbols and linearly added. And finally, the symbols after the linear addition are sent to a base station through time-frequency resources occupied by the system. And the terminal equipment repeats the process of determining the access degree and transmitting the modulation symbols with corresponding lengths until the data transmission is finished.

Optionally, as another embodiment, the receiving unit 501 is further configured to receive feedback information from the base station, where the feedback information is used to instruct the base station to successfully decode the data to be transmitted. The determining unit 502 is further configured to adjust the access degree probability distribution information according to the amount of data that has been sent at the time when the feedback information is received.

Optionally, as another embodiment, the determining unit 502 is specifically configured to, if the sent data amount is greater than a preset threshold, increase a probability corresponding to a first access degree in the access degree probability distribution information, where the first access degree is greater than the target average access degree.

It should be understood that the adjustment amount of the probability corresponding to the first access degree number can be adaptively adjusted according to the degree of the transmitted data quantity changing along with the adjustment amount

Optionally, as another embodiment, the data to be transmitted is encoded by using a fixed-rate precoding. Thus, under the condition that the length of the data to be transmitted is determined, the length of the coded bits is determined, and the decoding complexity of the base station side can be reduced. Meanwhile, the channel capacity can be adaptively approached by using the fixed-code-rate precoding for coding.

Fig. 6 is a schematic block diagram of a base station of one embodiment of the present invention. Base station 60 in fig. 6 includes a transmitting unit 601 and a receiving unit 602.

A sending unit 601, configured to send system state information to a terminal device, so that the terminal device determines access degree probability distribution information according to the system state information, where the system state information includes at least one of a total number of users and a total access degree of a time-frequency resource.

A receiving unit 602, configured to receive data sent by a terminal device according to access degree probability distribution information, where the access degree probability distribution information is used to indicate probabilities corresponding to when the terminal device sends data with a specific one or multiple access degrees respectively.

Optionally, as an embodiment, the sending unit 601 is further configured to send feedback information to the terminal device when the data sent by the terminal device is successfully decoded.

The terminal device 70 of fig. 7 may be used to implement the steps and methods of the above-described method embodiments. In the embodiment of fig. 7, terminal device 70 includes an antenna 701, a transmitter 702, a receiver 703, a processor 704, and a memory 705. Processor 704 controls the operation of terminal device 70 and may be used to process signals. Memory 705 may include both read-only memory and random access memory, and provides instructions and data to processor 704. The transmitter 702 and the receiver 703 may be coupled to an antenna 701. The various components of the terminal device 70 are coupled together by a bus system 709, wherein the bus system 709 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 709. For example, terminal device 70 may be access terminal 116 or access terminal 122 shown in fig. 1.

Specifically, memory 705 may store instructions that perform the following process:

Optionally, as an embodiment, the memory 705 may also store instructions to perform the following processes:

when determining the probability distribution information of the access degrees according to the system state information, determining the target average access degrees according to the system state information; and determining the probability distribution information of the access degrees according to the target average access degrees.

Optionally, as another embodiment, the memory 705 may also store instructions to perform the following process:

when data to be sent is respectively sent to a base station according to the access degree probability distribution information and the specific one or more access degrees and the corresponding probability, the access degree d when the data is sent is determined according to the access degree probability distribution information; d symbols are selected from data to be transmitted for linear addition, and the result after the linear addition is transmitted to a base station.

after respectively sending data to be sent to a base station according to the access degree probability distribution information and the specific one or more access degrees and the corresponding probability, receiving feedback information from the base station, wherein the feedback information is used for indicating the base station to successfully decode the data to be sent; and adjusting the access degree probability distribution information according to the data volume sent at the moment of receiving the feedback information.

when the access degree probability distribution information is adjusted according to the data volume sent at the moment of receiving the feedback information, if the sent data volume is larger than a preset threshold value, the probability corresponding to a first access degree in the access degree probability distribution information is increased, and the first access degree is larger than a target average access degree;

and the data to be transmitted is coded by adopting the pre-coding with a fixed code rate.

the system state information includes signal to noise ratio, SNR.

The base station 80 of fig. 8 may be used to implement the steps and methods of the above-described method embodiments. In the fig. 8 embodiment, base station 80 includes an antenna 801, a transmitter 802, a receiver 803, a processor 804, and a memory 805. Processor 804 controls the operation of base station 80 and may be used for processing signals. Memory 805 may include both read-only memory and random-access memory, and provides instructions and data to processor 804. Transmitter 802 and receiver 803 may be coupled to an antenna 801. The various components of the base station 80 are coupled together by a bus system 809, where the bus system 809 includes a power bus, a control bus, and a status signal bus in addition to a data bus. But for the sake of clarity the various buses are identified in the figure as the bus system 809. For example, the base station 80 may be the base station 102 shown in fig. 1.

Specifically, memory 805 may store instructions that perform the following process:

Optionally, as an embodiment, the memory 805 may also store instructions to perform the following process:

and after receiving the data sent by the terminal equipment according to the access degree probability distribution information, sending feedback information to the terminal equipment when the data sent by the terminal equipment is successfully decoded.

Optionally, as another embodiment, the memory 805 may also store instructions to perform the following process:

the system state information includes signal to noise ratio, SNR.

It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

A method of communication, the method comprising:

receiving system state information from a base station, wherein the system state information comprises at least one of total number of users and total access degrees of time-frequency resources;

determining access degree probability distribution information according to the system state information, wherein the access degree probability distribution information is used for indicating corresponding probabilities when data are respectively sent by one or more specific access degrees;

and according to the access degree probability distribution information, respectively sending data to be sent to the base station according to the specific one or more access degrees and the corresponding probability.
The method of claim 1, wherein determining the access degree probability distribution information according to the system state information comprises:

determining a target average access degree according to the system state information;

and determining the probability distribution information of the access degrees according to the target average access degrees.
The method according to claim 1 or 2, wherein the sending data to be sent to the base station according to the probability distribution information of the access degrees and the specific one or more access degrees and the corresponding probabilities respectively comprises:

determining the access degree d when the data is sent according to the access degree probability distribution information, wherein the d is a non-negative integer;

and d symbols are selected from the data to be transmitted for linear addition, and the result after the linear addition is transmitted to the base station.
The method according to any one of claims 1 to 3, wherein after the sending data to be sent to the base station with the specific one or more access degrees and corresponding probabilities respectively according to the access degree probability distribution information, the method further comprises:

receiving feedback information from the base station, wherein the feedback information is used for indicating the base station to successfully decode the data to be sent;

and adjusting the access degree probability distribution information according to the data volume sent at the moment of receiving the feedback information.
The method of claim 4, wherein the adjusting the access degree probability distribution information according to the amount of data that has been transmitted at the time the feedback information was received comprises:

if the sent data volume is larger than a preset threshold value, increasing the probability corresponding to a first access degree in the access degree probability distribution information, wherein the first access degree is larger than a target average access degree;

and if the sent data volume is smaller than a preset threshold value, reducing the probability corresponding to a first access degree in the access degree probability distribution information, wherein the first access degree is larger than a target average access degree.
The method according to any of claims 1 to 5, wherein the data to be transmitted is encoded with a fixed rate precoding.
The method of any of claims 1-6, wherein the system state information comprises a signal-to-noise ratio (SNR).
A method of communication, the method comprising:

sending system state information to terminal equipment so that the terminal equipment can determine access degree probability distribution information according to the system state information, wherein the system state information comprises at least one of the total number of users and the total access degree of time-frequency resources;

and receiving data sent by the terminal equipment according to the access degree probability distribution information, wherein the access degree probability distribution information is used for indicating the corresponding probability when the terminal equipment sends data respectively with one or more specific access degrees.
The method according to claim 8, wherein after the receiving the data transmitted by the terminal device according to the access degree probability distribution information, the method further comprises:

and when the data sent by the terminal equipment is decoded successfully, sending feedback information to the terminal equipment.
The method of claim 8 or 9, wherein the system state information comprises a signal-to-noise ratio (SNR).
A terminal device, characterized in that the terminal device comprises:

a receiving unit, configured to receive system state information from a base station, where the system state information includes at least one of a total number of users and a total number of accesses of time-frequency resources;

a determining unit, configured to determine, according to the system state information, access degree probability distribution information, where the access degree probability distribution information is used to indicate corresponding probabilities when data is sent with a specific one or multiple access degrees respectively;

and a sending unit, configured to send, according to the access degree probability distribution information, to the base station, the data to be sent according to the specific one or more access degrees and the corresponding probabilities.
The terminal device according to claim 11, wherein the determining unit is specifically configured to,

determining a target average access degree according to the system state information;

and determining the probability distribution information of the access degrees according to the target average access degrees.
The terminal device according to claim 11 or 12, wherein the sending unit is specifically configured to,

determining the access degree d when the data is sent according to the access degree probability distribution information, wherein the d is a non-negative integer;

and d symbols are selected from the data to be transmitted for linear addition, and the result after the linear addition is transmitted to the base station.
The terminal device according to any of claims 11 to 13,

the receiving unit is further configured to receive feedback information from the base station, where the feedback information is used to indicate that the base station successfully decodes the data to be sent;

the determining unit is further configured to adjust the access degree probability distribution information according to the amount of data that has been sent at the time when the feedback information is received.
The terminal device according to claim 14, wherein the determining unit is specifically configured to,

if the sent data volume is larger than a preset threshold value, increasing the probability corresponding to a first access degree in the access degree probability distribution information, wherein the first access degree is larger than a target average access degree;

and if the sent data volume is smaller than a preset threshold value, reducing the probability corresponding to a first access degree in the access degree probability distribution information, wherein the first access degree is larger than a target average access degree.
The terminal device according to any of claims 11 to 15, wherein the data to be transmitted is encoded with a fixed rate precoding.
The terminal device according to any of claims 11-16, wherein the system state information comprises a signal-to-noise ratio, SNR.
A base station, characterized in that the base station comprises:

a sending unit, configured to send system state information to a terminal device, so that the terminal device determines access degree probability distribution information according to the system state information, where the system state information includes at least one of a total number of users and a total access degree of a time-frequency resource;

a receiving unit, configured to receive data sent by the terminal device according to the access degree probability distribution information, where the access degree probability distribution information is used to indicate corresponding probabilities when the terminal device sends data with a specific one or multiple access degrees respectively.
The base station of claim 18, wherein the sending unit is further configured to send feedback information to the terminal device when the data sent by the terminal device is successfully decoded.
The base station of claim 18 or 19, wherein the system state information comprises signal to noise ratio, SNR.