WO2016070323A1 - Procédé de communication, dispositif terminal et station de base - Google Patents

Procédé de communication, dispositif terminal et station de base Download PDF

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Publication number
WO2016070323A1
WO2016070323A1 PCT/CN2014/090243 CN2014090243W WO2016070323A1 WO 2016070323 A1 WO2016070323 A1 WO 2016070323A1 CN 2014090243 W CN2014090243 W CN 2014090243W WO 2016070323 A1 WO2016070323 A1 WO 2016070323A1
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Prior art keywords
access
access degree
data
terminal device
probability distribution
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PCT/CN2014/090243
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English (en)
Chinese (zh)
Inventor
张朝阳
王献斌
张昱
张舜卿
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/090243 priority Critical patent/WO2016070323A1/fr
Priority to CN201480079687.0A priority patent/CN106688299B/zh
Publication of WO2016070323A1 publication Critical patent/WO2016070323A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access

Definitions

  • Embodiments of the present invention relate to the field of communications, and, more particularly, to a communication method, a terminal device, and a base station.
  • Massive Access International: Massive Access
  • the large-scale access scenario has the following characteristics: 1. The number of potential access users is large and dynamic; Second, the access network has a complex structure, the topology is variable, and the channel characteristics are dynamically changed. 3.
  • the service type is complex, and different users access data. There are significant differences in volume and latency requirements.
  • the system In a large-scale access scenario, if the system adopts a centrally controlled access mechanism, it will bring a series of problems. For example, the system needs to spend a lot of signaling resources to transmit information about the user's access mode, which reduces system efficiency. For another example, the base station needs to jointly optimize the access parameters of a large number of users, and the complexity is high.
  • the system needs a communication method based on a new access mechanism, thereby solving the problems of low efficiency and high complexity of the foregoing system.
  • the embodiments of the present invention provide a communication method, a terminal device, and a base station, which can improve system efficiency and reduce system complexity.
  • an embodiment of the present invention provides a communication method, including:
  • system status information from the base station, where the system status information includes at least one of a total number of users and a total access degree of the time-frequency resources;
  • the access degree probability distribution information Determining the access degree probability distribution information according to the system state information, where the access degree probability distribution information is used to indicate a probability corresponding to when the data is respectively sent by using the specific one or more access degrees;
  • the data to be transmitted is respectively sent to the base station by using a specific one or more access degrees and corresponding probabilities.
  • determining the access degree probability distribution information according to the system state information including:
  • the access degree probability distribution information is determined according to the target average access degree.
  • the base station sends the to-be-sent to the base station according to the access degree probability distribution information, and the specific one or more access degrees and the corresponding probability respectively.
  • Data including:
  • Determining, according to the probability distribution information of the access degree, the degree of access d, d when the data is sent is a non-negative integer
  • the d symbols are selected from the data to be transmitted for linear addition, and the linearly added result is sent to the base station.
  • the information is sent to the base station by using a specific one or more access degrees and a corresponding probability according to the access degree probability distribution information.
  • the method further includes:
  • the access degree probability distribution information is adjusted according to the amount of data that has been transmitted at the time of receiving the feedback information.
  • adjusting the access degree probability distribution information according to the amount of data that has been sent at the time of receiving the feedback information includes:
  • the probability of the first access degree in the access degree probability distribution information is increased, and the first access degree is greater than the target average access degree;
  • the probability of the first access degree in the access degree probability distribution information is reduced, and the first access degree is greater than the target average access degree.
  • the data to be transmitted is encoded by precoding with a fixed code rate.
  • the system state information includes a signal to noise ratio SNR.
  • an embodiment of the present invention provides a communication method, including:
  • the terminal device Transmitting system state information to the terminal device, so that the terminal device determines the 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 the time-frequency resource;
  • the cloth information is used to indicate the probability that the terminal device corresponds to when the data is separately transmitted by the specific one or more access degrees.
  • the method further includes:
  • the feedback information is sent to the terminal device.
  • the system state information includes a signal to noise ratio SNR.
  • an embodiment of the present invention provides a terminal device, including:
  • the receiving unit is configured to receive system state information from the base station, where the system state information includes at least one of a total number of users and a total access degree of the time-frequency resource. ;
  • a determining unit configured to determine, according to the system state information, the access degree probability distribution information, where the access degree probability distribution information is used to indicate a probability corresponding to when the data is sent by using the specific one or more access degrees respectively;
  • a sending unit configured to send data to be sent to the base station by using a specific one or more access degrees and a corresponding probability according to the access degree probability distribution information.
  • the determining unit is specifically configured to:
  • the access degree probability distribution information is determined according to the target average access degree.
  • the sending unit is specifically configured to:
  • Determining, according to the probability distribution information of the access degree, the degree of access d, d when the data is sent is a non-negative integer
  • the d symbols are selected from the data to be transmitted for linear addition, and the linearly added result is sent to the base station.
  • 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 of receiving the feedback information.
  • the probability of the first access degree in the access degree probability distribution information is increased, and the first access degree is greater than the target average access degree;
  • the probability of the first access degree in the access degree probability distribution information is reduced, and the first access degree is greater than the target average access degree.
  • the data to be sent is encoded by precoding with a fixed code rate.
  • the system state information includes a signal to noise ratio SNR.
  • an embodiment of the present invention provides a base station, including:
  • a sending unit configured to send system state information to the terminal device, so that the terminal device determines the 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 the time-frequency resource.
  • the receiving unit is configured to receive data that is sent by the terminal device according to the access degree probability distribution information, where the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is sent by using the specific one or more access degrees.
  • the sending unit is further configured to: when the data sent by the terminal device is successfully decoded, send the feedback information to the terminal device.
  • the system state information includes a signal to noise ratio SNR.
  • the terminal device determines the access degree probability distribution information according to the system state information. Then, the terminal device transmits data to the base station according to the access degree probability distribution information. In this way, the base station is not required to allocate access resources for each terminal device, or to indicate a specific access mode of each terminal device. Therefore, the embodiments of the present invention can improve system efficiency and reduce system complexity.
  • FIG. 1 shows 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 according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a communication method according to another embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of a communication method according to another embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of a terminal device according to an embodiment of the present invention.
  • Figure 6 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • FIG. 7 is a schematic block diagram of a terminal device according to another embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
  • an application running on a computing device and a computing device can be a component.
  • One or more components can reside within a process and/or execution thread, and the components can be located on one computer and/or distributed between two or more computers.
  • these components can execute from various computer readable media having various data structures stored thereon.
  • a component may, for example, be based on signals having one or more data packets (eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems) Communicate through local and/or remote processes.
  • data packets eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems
  • the present invention can be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques.
  • article of manufacture covers that it can be read from any computer.
  • a computer program that is accessed by a device, carrier, or media.
  • the computer readable medium may include, but is not limited to, a magnetic storage device (for example, a hard disk, a floppy disk, or a magnetic tape), and an optical disk (for example, a CD (Compact Disk), a DVD (Digital Versatile Disk). Etc.), smart cards and flash memory devices (eg, EPROM (Erasable Programmable Read-Only Memory), cards, sticks or key drivers, etc.).
  • 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” may include, but is not limited to, a wireless channel and various other mediums capable of storing, containing, and/or carrying instructions and/or data.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • General Packet Radio Service English: General Packet Radio Service, GPRS for short
  • LTE Long Term Evolution
  • LTE frequency division duplex English: Frequency Division Duplex, FDD for short
  • LTE time division duplex English: Time Division Duplex, TDD for short
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the terminal device may be referred to as a user equipment (English: User Equipment, UE for short), and may also be called a terminal (Terminal) or a mobile station (English: Mobile Station, referred to as MS) ), mobile terminal (Mobile Terminal), etc.
  • the terminal device may be a device that accesses the communication network, such as a sensor node, a car, or the like, or a device on which the communication network can be connected for communication.
  • the terminal device can communicate with one or more core networks via a radio access network (English: Radio Access Network, RAN for short), for example, the user equipment can be a mobile phone (or "cellular" phone), with mobile
  • RAN Radio Access Network
  • the user equipment can be a mobile phone (or "cellular" phone), with mobile
  • the computer or the like of the terminal for example, the user device can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with the wireless access network.
  • the base station may be a base station in GSM or CDMA (English: Base Transceiver Station, BTS for short), or may be a base station in WCDMA (English: NodeB, NB for short), or may be in LTE.
  • BTS Base Transceiver Station
  • WCDMA Wireless Fidelity
  • Evolved base station (English: Evolutional Node B, Jane Said: ENB or e-NodeB), the invention is not limited.
  • FIG. 1 shows a wireless communication system to which an embodiment of the present invention is applicable.
  • the wireless communication system 100 includes a base station 102 that can include multiple antenna groups.
  • Each antenna group may include one or more antennas, for example, one antenna group may include antennas 104 and 106, another antenna group may include antennas 108 and 110, and an additional group may include antennas 112 and 114.
  • Two antennas are shown in Figure 1 for each antenna group, although more or fewer antennas may be used for each group.
  • Base station 102 can additionally include a transmitter chain and a receiver chain, as will be understood by those of ordinary skill in the art, which can include multiple components associated with signal transmission and reception (e.g., processor, modulator, multiplexer, demodulation) , demultiplexer or antenna, etc.).
  • Base station 102 can communicate with one or more user equipments, such as access terminal 116 and access terminal 122. However, it will be appreciated that base station 102 can communicate with any number of access terminals similar to access terminal 116 or 122. Access terminals 116 and 122 can be, for example, cellular telephones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other for communicating over wireless communication system 100. Suitable for equipment. As shown, access terminal 116 is in communication with antennas 112 and 114, with antennas 112 and 114 transmitting information to access terminal 116 over forward link 118 and receiving information from access terminal 116 over reverse link 120.
  • access terminal 122 is in communication with antennas 104 and 106, wherein 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.
  • FDD Frequency Division Duplex
  • the forward link 118 can utilize a different frequency band than that used by the reverse link 120, and the forward link 124 can utilize the reverse link 126. Different frequency bands used.
  • the forward link 118 and the reverse link 120 can use a common frequency band, and the forward link 124 and the reverse link 126 can use a common frequency band.
  • Each set of antennas and/or regions designed for communication is referred to as a sector of base station 102.
  • the antenna group can be designed to communicate with access terminals in sectors of the coverage area of base station 102.
  • the transmit antenna of base station 102 may utilize beamforming to improve the signal to noise ratio of forward links 118 and 124.
  • the base station 102 uses beamforming to transmit signals to the randomly dispersed access terminals 116 and 122 in the relevant coverage area, the base station 102 uses a single antenna to transmit signals to all of its access terminals. Mobile devices are subject to less interference.
  • base station 102, access terminal 116 or access terminal 122 may be wireless communication A transmitting device and/or a wireless communication receiving device.
  • the wireless communication transmitting device can encode the data for transmission.
  • the wireless communication transmitting device may acquire (eg, generate, receive from other communication devices, or store in memory, etc.) a certain number of data bits to be transmitted over the channel to the wireless communication receiving device.
  • Such data bits may be included in a transport block (or multiple transport blocks) of data that may be segmented to produce multiple code blocks.
  • the wireless communication transmitting apparatus may encode each code block using an encoder (not shown).
  • 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.
  • the number of terminal devices e.g., access terminal 116 or access terminal 122
  • the system adopts a centrally controlled access mechanism, it will bring a series of problems. For example, the system needs to spend a lot of signaling resources to transmit information about the user's access mode, which reduces system efficiency.
  • the base station needs to jointly optimize the access parameters of a large number of users, and the complexity is high.
  • the embodiment of the invention provides a communication method, which can improve system efficiency and reduce system complexity.
  • the communication method of the embodiment of the present invention will be described in detail below. It should be noted that these examples are only intended to assist those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention.
  • FIG. 2 is a schematic flow chart of a communication method according to an 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.
  • 201 Receive system status information from a base station, where the system status information includes at least one of a total number of users and a total access degree of time-frequency resources.
  • the total number of users indicates the total number of terminal devices accessing the base station in the current communication system
  • the total access degree of the time-frequency resources refers to the total access degree of the time-frequency resources in the current system or the average time-frequency in the preset time period.
  • the total access degree of the time-frequency resource in the system reflects the size of the system load (the channel quality is usually poor when the load is greater than a preset value), such as the total number of data symbols carried on the time-frequency resource of the system.
  • the access degree probability distribution information is used to indicate a probability corresponding to when the data is separately sent by using the specific one or more access degrees.
  • the access degree probability distribution information includes one or more specific access degrees and corresponding probabilities.
  • the terminal device transmits data to the base station according to the specified specific degree of access and the corresponding probability.
  • the access degree probability distribution information may be expressed in the form of a table, or may be represented by a function expression, which is not limited by the embodiment of the present invention.
  • the access degree distribution function Where d is the access degree, p d is the corresponding probability, and N is the length of the coded bit.
  • the access degree probability distribution information includes three access degrees d 1 , d 2 , and d 3 , and the corresponding probabilities are p 1 , p 2 , and p 3 , respectively .
  • p 1 + p 2 + p 3 1.
  • the terminal device transmits data to the base station by using the three access degrees d 1 , d 2 , and d 3 respectively , and the number of times the data is transmitted by each access degree is determined according to the corresponding probability.
  • the terminal device determines the access degree probability distribution information according to the system state information. Then, the terminal device transmits data to the base station according to the access degree probability distribution information. In this way, the base station is not required to allocate access resources for each terminal device, or to indicate a specific access mode of each terminal device. Therefore, the embodiments of the present invention can improve system efficiency and reduce system complexity.
  • the target average access degree when determining the access degree probability distribution information according to the system state information, may be determined according to the system state information. Then, according to the target average access degree, the access degree probability distribution information is determined.
  • the terminal device can know the current system load based on the system status information. In combination with the preset system load threshold, the terminal device can determine the average access degree that is currently available to itself, that is, the target average access degree. Specifically, the terminal device may use the system load threshold to subtract the current system load value (the total access degree of the instant frequency resource), and use the difference as the target average access degree, or take a smaller than the decoding complexity requirement. The access degree of the aforementioned difference is used as the target average access degree. Then, the terminal device may determine the access degree probability distribution information according to the target average access degree. The M access degrees included in the access degree probability distribution information and the corresponding probability thereof satisfy the following two conditions:
  • Condition one finding the product of each of the M access degrees and its corresponding probability, M products are obtained, and the sum of the M products is equal to the aforementioned target average access degree.
  • the terminal device may divide the preset system load threshold by the total number of users, and use the corresponding quotient value as the target average access degree.
  • the terminal device may divide the total access degree of the time-frequency resource by the total number of users, and use the corresponding quotient value as the target average access degree. It should be understood that these variations are intended to fall within the scope of the present invention.
  • the terminal device may further determine the access degree probability distribution information by combining other factors such as a signal to noise ratio (SNR: SNR) and a data transmission requirement.
  • SNR signal to noise ratio
  • the channel gains of the individual users are the same, and the iterative performance of the external information is obtained.
  • the convergence point of the average external information quickly becomes saturated.
  • the convergence point of the external information is progressive performance, and the access probability corresponding to the 99% of the progressive performance convergence point is called the saturation point.
  • the access probability that is, the probability that the access degree corresponds to
  • the access probability is increased, the convergence point of the external information increases, and the system performance increases.
  • the access probability is greater than the saturation point, the access probability is increased, and the convergence point of the external information is basically unchanged, but the complexity of the system will continue to increase.
  • the target average access degree can be determined according to the saturation point, and then the access degree probability distribution information is determined according to the target average access degree.
  • the foregoing method for determining the access degree probability distribution information is exemplified. It should be understood that the scope of protection of the embodiments of the present invention is not limited thereto. Assuming that the target average access degree is 3, the following two types of information can be used as the access degree probability distribution information in the embodiment of the present invention:
  • the first type of 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;
  • the second type of information includes an access degree of 3, and the corresponding probability is 1.
  • the second information may be selected as the access degree probability distribution information.
  • the first type of information may be selected as the access degree probability distribution information.
  • the terminal device may first access according to the access
  • the degree probability distribution information determines the degree of access d, d when the data is transmitted this time, and is a non-negative integer. Then, d symbols are selected from the data to be transmitted for linear addition, and the linearly added result is transmitted to the base station.
  • the terminal device encodes the data by using a low density parity check code (English: Low Density Parity Check Code, LDPC for short) to obtain coded bits.
  • the coded bits are then symbol mapped to obtain a series of modulation symbols.
  • the terminal device determines the access degree d when the data is transmitted this time according to the access degree probability distribution information.
  • d symbols are selected from the aforementioned modulation symbols for linear addition.
  • the linearly added symbols are transmitted to the base station through the time-frequency resources occupied by the system.
  • the terminal device repeats the aforementioned process of determining the access degree and transmitting a modulation symbol of a corresponding length until the data transmission is completed.
  • the terminal device after transmitting the data to be sent to the base station by using the specific degree or the access degree and the corresponding probability according to the access degree probability distribution information, the terminal device receives the feedback information from the base station.
  • the feedback information is used to indicate that the base station successfully decodes the foregoing 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 of receiving the feedback information.
  • the base station 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 the feedback information to the terminal device.
  • the feedback information may be confirmation information.
  • the terminal device can determine the current channel quality status (eg, better or worse) according to the time when the feedback information arrives. Generally, if the feedback information arrives later, if the amount of data that has been sent when the feedback information arrives is greater than the preset threshold, the channel quality is poor. Conversely, if the feedback information arrives earlier, if the amount of data that has been sent when the feedback information arrives is less than the preset threshold, the channel quality is better. Furthermore, the terminal device can adjust the access degree probability distribution information according to the channel quality condition.
  • the access degree probability distribution information when the access degree probability distribution information is adjusted according to the amount of data that has been sent at the time of receiving the feedback information, if the amount of data that has been sent is greater than a preset threshold, the probability of the access degree is increased. The probability corresponding to the first access degree in the distribution information, the first access degree is greater than the target average access degree. If the amount of data that has been sent is less than a preset threshold, the probability of the first access degree in the access degree probability distribution information is reduced, and the first access degree is greater than the target average access degree.
  • the adjustment process of the aforementioned access degree probability distribution information can be completed relatively quickly.
  • the foregoing adjustment of the access degree greater than the target average access degree may be referred to as coarse adjustment.
  • a fine-tuning method can also be used when the amount of data that has been transmitted is not much different from the preset threshold. For example, the access degree of the access degree probability distribution information is smaller than 0.
  • the access degree probability distribution information includes four access degrees.
  • the numbers 0, 2, 4, and 6 correspond to the probability of 0.3, 0.2, 0.2, and 0.3, respectively. If the amount of data that has been sent is greater than a preset threshold, then the probability of access degree 6 or 4 may be increased.
  • the access degree probability distribution information may be adjusted to: access degrees 0, 2, 4, 6, the corresponding probabilities are 0.2, 0.1, 0.3, 0.4, respectively, or the corresponding probabilities are 0.2, 0.2, 0.2, respectively. 0.4, or the corresponding probability is 0.2, 0.2, 0.3, 0.3.
  • the method for adjusting the access probability distribution information may refer to the foregoing method. To avoid repetition, details are not described herein again.
  • the adjustment amount of the probability corresponding to the first access degree may be adaptively adjusted according to the degree of change of the amount of transmitted data with the adjustment amount.
  • the data to be transmitted is encoded by precoding with a fixed code rate.
  • the length of the data to be transmitted is determined, the length of the coded bits is determined, and the decoding complexity on the base station side can be reduced.
  • the system status information includes a signal to noise ratio SNR.
  • FIG. 3 is a schematic flowchart of a communication method according to 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.
  • the terminal device sends system state information to the 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 a total number of users and a total access degree of the time-frequency resource. At least one.
  • the total number of users indicates the total number of terminal devices accessing the base station in the current communication system
  • the total access degree of the time-frequency resources refers to the total access degree of the time-frequency resources in the current system or the average time-frequency in the preset time period.
  • the total access degree of the time-frequency resource in the system reflects the size of the system load (the channel quality is usually poor when the load is greater than a preset value), such as the total number of data symbols carried on the time-frequency resource of the system.
  • the access degree probability distribution information includes three access degrees d 1 , d 2 , and d 3 , and the corresponding probabilities are p 1 , p 2 , and p 3 , respectively .
  • p 1 + p 2 + p 3 1.
  • the terminal device transmits data to the base station by the aforementioned three access degrees d 1 , d 2 , d 3 , respectively, and the number of times the data is transmitted with each access degree is determined according to the corresponding probability.
  • the base station respectively receives the terminal device to transmit data according to the access degree probability distribution information. That is, a distributed communication system is formed, which does not require a base station to allocate communication resources or access modes for each terminal device.
  • the terminal device determines the access degree probability distribution information according to the system state information. Then, the terminal device transmits data to the base station according to the access degree probability distribution information. In this way, the base station is not required to allocate access resources for each terminal device, or to indicate a specific access mode of each terminal device. Therefore, the embodiments of the present invention can improve system efficiency and reduce system complexity.
  • the feedback information is sent to the terminal device.
  • the base station 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 the feedback information to the terminal device.
  • the feedback information may be confirmation information.
  • the terminal device can determine the current channel quality status (eg, better or worse) according to the time when the feedback information arrives. Generally, if the feedback information arrives later, if the amount of data that has been sent when the feedback information arrives is greater than the preset threshold, the channel quality is poor. Conversely, if the feedback information arrives earlier, if the amount of data that has been sent when the feedback information arrives is less than the preset threshold, the channel quality is better. Furthermore, the terminal device can adjust the access degree probability distribution information according to the channel quality condition.
  • the system state information includes a signal to noise ratio SNR.
  • FIG. 4 is a schematic flowchart of a communication method according to another embodiment of the present invention.
  • the communication method of the embodiment of the present invention is further described below with reference to FIG. It should be noted that these examples are only intended to assist those skilled in the art to better understand the embodiments of the present invention and not to limit the scope of the embodiments of the present invention.
  • UE 1, UE 2, ..., UE M accesses the base station for communication.
  • the data to be sent of UE 1 is The length is K 1 bit, which is input to the encoder for encoding to obtain coded bits. Performing symbol mapping on coded bits to obtain a series of modulation symbols
  • the adaptive adjuster generates or adjusts the access degree probability distribution information according to the system state information transmitted from the base station side.
  • the degree generator determines the degree d 1 of the current transmission according to the access degree probability distribution information, and the data selector MUX from the modulation symbol
  • the d 1 symbols are input to the adder, linearly added, and finally transmitted to the channel time-frequency resource block.
  • the degree generator repeats the foregoing process until the aforementioned data to be transmitted is successfully transmitted
  • the data to be sent of UE M is The length is K M bits, and the input is encoded to encode to obtain coded bits.
  • the coded bits are symbol mapped to obtain a series of modulation symbols.
  • the length is N M bits.
  • the adaptive adjuster generates or adjusts the access degree probability distribution information according to the system state information transmitted from the base station side.
  • the degree generator determines the degree d M of the current transmission according to the access degree probability distribution information, and the data selector MUX from the modulation symbol
  • the d M symbols are selected and input to the adder, and are linearly added, and finally transmitted to the channel time-frequency resource block.
  • the degree generator repeats the foregoing process until the aforementioned modulation symbols are successfully transmitted
  • the base station acquires system status information and transmits system status information to each UE.
  • the base station demodulates the data received from the UE, and obtains demodulation information corresponding to each time-frequency resource block. Then, 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, a unified factor graph (eg, Tanner graph) is constructed, and the multi-user is iterated on the factor graph. Detection decoding.
  • the base station successfully decodes a message of one UE, it sends an acknowledgement message to the UE. At the same time, the current receiving sequence of the user is eliminated from the factor graph. In this way, the base station performs iterative decoding based on a factor graph, which does not require complicated multi-user detection and SISO decoder iterative process, thereby reducing system complexity, that is, decoding complexity.
  • FIG. 5 is a schematic block diagram of a terminal device according to an 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.
  • the receiving unit 501 is configured to receive system state information from the base station, where the system state information includes at least one of a total number of users and a total access degree of the time-frequency resource.
  • the total number of users indicates the total number of terminal devices accessing the base station in the current communication system
  • the total access degree of the time-frequency resources refers to the total access degree of the time-frequency resources in the current system or the average time-frequency in the preset time period.
  • the total access degree of the time-frequency resource in the system reflects the size of the system load (the channel quality is usually poor when the load is greater than a preset value), such as the total number of data symbols carried on the time-frequency resource of the system.
  • the determining unit 502 is configured to determine the access degree probability distribution information according to the system state information, where the access degree probability distribution information is used to indicate a probability corresponding to when the data is separately transmitted by using the specific one or more access degrees.
  • the access degree probability distribution information includes one or more specific access degrees and corresponding probabilities.
  • the terminal device transmits data to the base station according to the specified specific access degree and the corresponding probability.
  • the access degree probability distribution information may be expressed in the form of a table or may be represented by a function expression.
  • the access degree distribution function Where d is the access degree, p d is the corresponding probability, and N is the length of the coded bit.
  • the sending unit 503 is configured to separately send data to be sent to the base station according to the access degree probability distribution information by using a specific one or more access degrees and a corresponding probability.
  • the access degree probability distribution information includes three access degrees d 1 , d 2 , and d 3 , and the corresponding probabilities are p 1 , p 2 , and p 3 , respectively .
  • p 1 + p 2 + p 3 1.
  • the terminal device transmits data to the base station by using the three access degrees d 1 , d 2 , and d 3 respectively , and the number of times the data is transmitted by each access degree is determined according to the corresponding probability.
  • the terminal device determines the access degree probability distribution information according to the system state information. Then, the terminal device transmits data to the base station according to the access degree probability distribution information. In this way, the base station is not required to allocate access resources for each terminal device, or to indicate a specific access mode of each terminal device. Therefore, the embodiments of the present invention can improve system efficiency and reduce system complexity.
  • the determining unit 502 is specifically configured to determine a target average access degree according to the system state information. Then, according to the target average access degree, the access degree probability distribution information is determined.
  • the terminal device can know the current system load based on the system status information. In combination with the preset system load threshold, the terminal device can determine the average access degree that is currently available to itself, that is, the target average access degree. Specifically, the terminal device may use the system load threshold to subtract the current system load value (the total access degree of the instant frequency resource), and use the difference as the target average access degree, or take a smaller than the decoding complexity requirement. The access degree of the aforementioned difference is used as the target average access degree. Then, the terminal device may determine the access degree probability distribution information according to the target average access degree. The M access degrees included in the access degree probability distribution information and the corresponding probability thereof satisfy the following two conditions:
  • the terminal device may divide the preset system load threshold by the total number of users, and use the corresponding quotient value as the target average access degree.
  • the terminal device may divide the total access degree of the time-frequency resource by the total number of users, and use the corresponding quotient value as the target average access degree. It should be understood that these variations are intended to fall within the scope of the present invention.
  • the terminal device may further determine the access degree probability distribution information by combining other factors such as a signal to noise ratio SNR, a data transmission requirement, and the like. It is assumed that the channel gains of the individual users are the same, and the iterative performance of the external information is obtained. As the total access degree of the time-frequency resource block increases, the convergence point of the average external information quickly becomes saturated. 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 99% of the progressive performance convergence point is called the saturation point.
  • the access probability that is, the probability that the access degree corresponds to
  • the access probability is increased, the convergence point of the external information increases, and the system performance increases.
  • the access probability is greater than the saturation point, the access probability is increased, and the convergence point of the external information is basically unchanged, but the complexity of the system will continue to increase.
  • the target average access degree can be determined according to the saturation point, and then the access degree probability distribution information is determined according to the target average access degree.
  • the sending unit 503 is specifically configured to determine, according to the access degree probability distribution information, the access degree d when the data is sent this time.
  • the d symbols are selected from the data to be transmitted for linear addition, and the linearly added result is sent to the base station.
  • the terminal device encodes the data using a low density parity check code LDPC to obtain coded bits.
  • the coded bits are then symbol mapped to obtain a series of modulation symbols.
  • the terminal device determines the access degree d when the data is transmitted this time according to the access degree probability distribution information.
  • d symbols are selected from the aforementioned modulation symbols for linear addition.
  • the linearly added symbols are transmitted to the base station through the time-frequency resources occupied by the system.
  • the terminal device repeats the aforementioned process of determining the access degree and transmitting a modulation symbol of a corresponding length until the data transmission is completed.
  • the receiving unit 501 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 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 of receiving the feedback information.
  • the base station 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 the feedback information to the terminal device.
  • the feedback letter The information can be confirmation information.
  • the terminal device can determine the current channel quality status (eg, better or worse) according to the time when the feedback information arrives. Generally, if the feedback information arrives later, if the amount of data that has been sent when the feedback information arrives is greater than the preset threshold, the channel quality is poor. Conversely, if the feedback information arrives earlier, if the amount of data that has been sent when the feedback information arrives is less than the preset threshold, the channel quality is better. Furthermore, the terminal device can adjust the access degree probability distribution information according to the channel quality condition.
  • the determining unit 502 is specifically configured to: if the amount of data that has been sent is greater than a preset threshold, increase a probability corresponding to the first access degree in the access degree probability distribution information, where the first connection The number of entries is greater than the target average access degree.
  • the probability of the first access degree in the access degree probability distribution information is reduced, and the first access degree is greater than the target average access degree.
  • the adjustment process of the aforementioned access degree probability distribution information can be completed relatively quickly.
  • the foregoing adjustment of the access degree greater than the target average access degree may be referred to as coarse adjustment.
  • a fine-tuning method can also be used when the amount of data that has been transmitted is not much different from the preset threshold. For example, the access degree of the access degree probability distribution information is smaller than 0.
  • the method for adjusting the access probability distribution information may refer to the foregoing method. To avoid repetition, details are not described herein again.
  • the adjustment amount of the probability corresponding to the first access degree may be adaptively adjusted according to the degree of change of the amount of transmitted data with the adjustment amount.
  • the adjustment amount of the probability corresponding to the first access degree may be adaptively adjusted according to the degree of change of the transmitted data amount according to the adjustment amount.
  • the data to be transmitted is encoded by precoding with a fixed code rate.
  • the length of the data to be transmitted is determined, the length of the coded bits is determined, and the decoding complexity on the base station side can be reduced.
  • encoding with precoding of a fixed code rate enables adaptive approach to channel capacity.
  • the system status information includes a signal to noise ratio SNR.
  • FIG. 6 is a schematic block diagram of a base station in accordance with one embodiment of the present invention.
  • the base station 60 in FIG. 6 includes a transmitting unit 601 and a receiving unit 602.
  • the sending unit 601 is configured to send system state information to the terminal device, so that the terminal device determines the 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 the time-frequency resource. Kind.
  • the total number of users indicates the total number of terminal devices accessing the base station in the current communication system
  • the total access degree of the time-frequency resources refers to the total access degree of the time-frequency resources in the current system or the average time-frequency in the preset time period.
  • the total access degree of the time-frequency resource in the system reflects the size of the system load (the channel quality is usually poor when the load is greater than a preset value), such as the total number of data symbols carried on the time-frequency resource of the system.
  • the receiving unit 602 is configured to receive data that is sent by the terminal device according to the access degree probability distribution information, where the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is sent by using the specific one or more access degrees.
  • the access degree probability distribution information includes three access degrees d 1 , d 2 , and d 3 , and the corresponding probabilities are p 1 , p 2 , and p 3 , respectively .
  • p 1 + p 2 + p 3 1.
  • the terminal device transmits data to the base station by using the three access degrees d 1 , d 2 , and d 3 respectively , and the number of times the data is transmitted by each access degree is determined according to the corresponding probability.
  • the base station respectively receives the terminal device to transmit data according to the access degree probability distribution information. That is, a distributed communication system is formed, which does not require a base station to allocate communication resources or access modes for each terminal device.
  • the terminal device determines the access degree probability distribution information according to the system state information. Then, the terminal device transmits data to the base station according to the access degree probability distribution information. In this way, the base station is not required to allocate access resources for each terminal device, or to indicate a specific access mode of each terminal device. Therefore, the embodiments of the present invention can improve system efficiency and reduce system complexity.
  • the sending unit 601 is further configured to: when successfully decoding the data sent by the terminal device, send the feedback information to the terminal device.
  • the base station 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 the feedback information to the terminal device.
  • the feedback information may be confirmation information.
  • the terminal device can determine the current channel quality status (eg, better or worse) according to the time when the feedback information arrives. Normally, if the feedback information arrives later, if the amount of data that has been sent when the feedback information arrives is greater than the preset threshold, the channel quality is described. The amount is poor. Conversely, if the feedback information arrives earlier, if the amount of data that has been sent when the feedback information arrives is less than the preset threshold, the channel quality is better. Furthermore, the terminal device can adjust the access degree probability distribution information according to the channel quality condition.
  • the system status information includes a signal to noise ratio SNR.
  • FIG. 7 is a schematic block diagram of a terminal device according to another embodiment of the present invention.
  • terminal device 70 of FIG. 7 can be used to implement the steps and methods in the foregoing method embodiments.
  • 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 can be used to process signals.
  • Memory 705 can include read only memory and random access memory and provides instructions and data to processor 704.
  • Transmitter 702 and receiver 703 can be coupled to antenna 701.
  • the various components of terminal device 70 are coupled together by a bus system 709, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 709 in the figure.
  • terminal device 70 can be access terminal 116 or access terminal 122 shown in FIG.
  • the memory 705 can store instructions to perform the following process:
  • system status information from the base station, where the system status information includes at least one of a total number of users and a total access degree of the time-frequency resources;
  • the access degree probability distribution information Determining the access degree probability distribution information according to the system state information, where the access degree probability distribution information is used to indicate a probability corresponding to when the data is respectively sent by using the specific one or more access degrees;
  • the data to be transmitted is respectively sent to the base station by using a specific one or more access degrees and corresponding probabilities.
  • the terminal device determines the access degree probability distribution information according to the system state information. Then, the terminal device transmits data to the base station according to the access degree probability distribution information. In this way, the base station is not required to allocate access resources for each terminal device, or to indicate a specific access mode of each terminal device. Therefore, the embodiments of the present invention can improve system efficiency and reduce system complexity.
  • the memory 705 may also store instructions to perform the following process:
  • the memory 705 may also store instructions to perform the following process:
  • the access when the data is transmitted is determined according to the access degree probability distribution information.
  • Degree d select d symbols from the data to be transmitted for linear addition, and send the result of linear addition to the base station.
  • the memory 705 may also store instructions to perform the following process:
  • the feedback information After transmitting the data to be sent to the base station according to the access degree probability distribution information by using the specific one or more access degrees and the corresponding probability, the feedback information is received from the base station, and the feedback information is used to indicate that the base station successfully decodes to be sent. Data; adjust the access degree probability distribution information according to the amount of data that has been transmitted at the time of receiving the feedback information.
  • the memory 705 may also store instructions to perform the following process:
  • the access degree probability distribution information is adjusted according to the amount of data that has been sent at the time of receiving the feedback information, if the amount of data that has been sent is greater than a preset threshold, the first access degree in the access degree probability distribution information is increased. Probability, the first access degree is greater than the target average access degree;
  • the probability of the first access degree in the access degree probability distribution information is reduced, and the first access degree is greater than the target average access degree.
  • the memory 705 may also store instructions to perform the following process:
  • the data to be transmitted is encoded using a precoding of a fixed code rate.
  • the memory 705 may also store instructions to perform the following process:
  • System status information includes signal to noise ratio SNR.
  • FIG. 8 is a schematic block diagram of a base station according to another embodiment of the present invention.
  • the base station 80 of FIG. 8 can be used to implement the steps and methods in the foregoing method embodiments.
  • 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 can be used to process signals.
  • Memory 805 can include read only memory and random access memory and provides instructions and data to processor 804.
  • Transmitter 802 and receiver 803 can be coupled to antenna 801.
  • the various components of base station 80 are coupled together by a bus system 809, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 809 in the figure.
  • base station 80 can be base station 102 shown in FIG.
  • the memory 805 can store instructions to perform the following process:
  • the terminal device determines the access degree probability distribution information according to the system status information, where the system status information includes the total number of users and the total access of the time-frequency resources. At least one of degrees;
  • the receiving terminal device obtains data according to the access degree probability distribution information, and the access degree probability distribution information is used to indicate a probability corresponding to the terminal device when the data is separately transmitted by using the specific one or more access degrees.
  • the terminal device determines the access degree probability distribution information according to the system state information. Then, the terminal device transmits data to the base station according to the access degree probability distribution information. In this way, the base station is not required to allocate access resources for each terminal device, or to indicate a specific access mode of each terminal device. Therefore, the embodiments of the present invention can improve system efficiency and reduce system complexity.
  • the memory 805 may also store instructions to perform the following process:
  • the feedback information is sent to the terminal device.
  • the memory 805 may also store instructions to perform the following process:
  • System status information includes signal to noise ratio SNR.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention.
  • the implementation process constitutes any limitation.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another The system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the 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 standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory (English: Read-Only Memory, abbreviated as: ROM), a random access memory (English: Random Access Memory, abbreviated as: RAM), a magnetic disk or an optical disk, and the like.
  • ROM Read-Only Memory
  • RAM Random Access Memory

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de communication, un dispositif terminal et une station de base. Le procédé consiste à : recevoir, d'une station de base, des informations d'état d'un système, les informations d'état du système comprenant le nombre total d'utilisateurs et/ou le degré d'accès total de ressources temps-fréquence; déterminer des informations de distribution de probabilité de degré d'accès selon les informations d'état du système, les informations de distribution de probabilité de degré d'accès servant à indiquer une probabilité ou des probabilités lorsque des données sont envoyées séparément selon un ou plusieurs degrés d'accès; et envoyer séparément à la station de base, selon les informations de distribution de probabilité de degré d'accès, des données à envoyer à l'aide d'un ou de plusieurs degrés d'accès et d'une ou de plusieurs probabilités correspondantes. Des modes de réalisation de la présente invention peuvent améliorer l'efficacité de systèmes et en réduire la complexité.
PCT/CN2014/090243 2014-11-04 2014-11-04 Procédé de communication, dispositif terminal et station de base WO2016070323A1 (fr)

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