CN111263392B - Uplink data transmission method, device and storage medium of industrial wireless network - Google Patents

Uplink data transmission method, device and storage medium of industrial wireless network Download PDF

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Publication number
CN111263392B
CN111263392B CN201811460097.9A CN201811460097A CN111263392B CN 111263392 B CN111263392 B CN 111263392B CN 201811460097 A CN201811460097 A CN 201811460097A CN 111263392 B CN111263392 B CN 111263392B
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China
Prior art keywords
target terminal
uplink data
terminals
terminal
time frame
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CN111263392A (en
Inventor
任桂山
方睿
苏锋
刘晴
米立飞
陈学梅
孙凯
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Petrochina Co Ltd
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Petrochina Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H04L1/0018—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement based on latency requirement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application discloses an uplink data transmission method, an uplink data transmission device and a storage medium of an industrial wireless network, and belongs to the technical field of wireless networks. The method comprises the following steps: the target terminal receives a j-th total busy signal in a j-th time slot of the time frame; the target terminal determines i active terminals according to m total busy tone signals received in m time slots; and the target terminal predicts whether the access network equipment successfully receives the uplink data sent by the target terminal in the time frame according to the channel information of the i active terminals. The target terminal of the application automatically determines whether uplink data can be sent in the current time frame by detecting the sending condition of the active terminal in the first m time slots of the h time slots, thereby avoiding the possible sending collision problem.

Description

Uplink data transmission method, device and storage medium of industrial wireless network
Technical Field
The present application relates to the field of wireless networks, and in particular, to a method and apparatus for transmitting uplink data in an industrial wireless network, and a storage medium.
Background
The industrial wireless network comprises a base station, a sensing node and various industrial equipment. In order to monitor the operation conditions of various industrial equipment in real time, a base station uses a sensing node to collect operation data of the various industrial equipment, converts the operation data into uplink data, sends uplink signals carrying the uplink data to the base station through a wireless network technology, and the base station performs corresponding processing according to the received uplink signals.
Currently, the base station decodes the uplink signal sent by the sensing node using successive interference cancellation (Successive Interference Cancellation, SIC) techniques. The signal received by the base station is a mixed signal, the mixed signal is a signal formed by overlapping uplink signals sent by a plurality of sensing nodes, and the base station detects the strongest uplink signal in the mixed signal in an iterative mode by using a SIC technology. If the signal-to-interference-plus-noise ratio (Signal to Interference and Noise Ratio, SINR) of the strongest uplink signal is not below the decoding threshold, the strongest uplink signal can be decoded by the base station and removed from the mixed signal. The base station then continues to determine the next strongest uplink signal from the remaining uplink signals, decodes the strongest uplink signal until all uplink signals are decoded or the iteration fails.
In order to ensure normal transmission of the SIC technology, the related technology adopts a centralized scheduling mode, namely, when each time frame starts, the base station collects whether each sensing node has transmission requirements or not in an inquiry mode, and distributes transmission power to the corresponding sensing node according to the transmission requirements of each sensing node, and only the sensing node distributed to the transmission power can transmit uplink signals to the base station so as to ensure that the SINR of the uplink signals meets the requirements.
The sensing node generally has a transmission requirement under an emergency condition, and because the related technology performs centralized scheduling according to a time frame unit, the sensing node may need to wait for a time frame to perform uplink transmission, and cannot meet the low-delay requirement of the industrial wireless network.
Disclosure of Invention
The embodiment of the application provides an uplink data transmission method, an uplink data transmission device and a storage medium of an industrial wireless network, which can solve the problem that a sensing node has transmission requirements under emergency conditions, and the related technology is to perform centralized scheduling according to a time frame unit, so that the sensing node can wait for the time of one time frame to perform uplink transmission, thereby failing to meet the low-delay requirement of the industrial wireless network, and the technical scheme is as follows:
according to an aspect of the embodiments of the present disclosure, there is provided an uplink data transmission method of an industrial wireless network, which is applied to a target terminal among n terminals, where the target terminal stores channel information of n-1 other terminals, the method including:
the target terminal receives a j-th total busy signal in a j-th time slot of a time frame, wherein the j-th total busy signal is formed by overlapping i active terminals in other terminals according to busy signals sent by power corresponding to the j-th time slot, the time frame comprises h time slots, j is more than or equal to 1 and less than or equal to h, h is more than or equal to n, i is more than or equal to 0 and less than or equal to n-1, and n is more than or equal to 2;
The target terminal determines the i active terminals according to m total busy signals received in m time slots, wherein the i active terminals are terminals transmitting uplink data in the time frame, m is less than or equal to 2t and less than h, and t is the upper limit number of the active terminals;
and the target terminal predicts whether the access network equipment can successfully receive the uplink data sent by the target terminal in the time frame according to the channel information of the i active terminals.
Optionally, the channel information includes channel information from the active terminal to the target terminal, and the target terminal determines a user state vector usv=(s) according to m total busy signals received in m time slots and the channel information 1 ,s 2 ,…,s n )；
wherein ,
optionally, the channel information includes the active terminal u i To the target terminal u c Channel information g of (2) ic ；
The target terminal calculates the user state vector USV=(s) according to the following formula 1 ,s 2 ,…,s n )；
Wherein the active terminal u is set i Using power tp in the jth time slot ji Transmitting the busy signal, and the target terminal u c The j-th total busy signal received in the j-th time slot is recorded as rp j ，g ic Is the active terminal u i To the target terminal u c Channel information of (2); m is less than or equal to 2t and less than h, and t is the upper limit number of the active terminals.
Optionally, the channel information includes the received power from the active terminal to the access network device, and the target terminal predicts whether the uplink data sent by the target terminal in the time frame can be successfully decoded by the access network device according to the received power of the i active terminals and the received power of the target terminal;
and the target terminal determines to send the uplink data in the time frame when determining that the uplink data can be successfully decoded by the access network equipment.
Optionally, the target terminal determines k first received powers and l second received powers from the received powers of the i active terminals according to the self received power; the k first received powers are larger than the self received power, the l second received powers are smaller than the self received power, and k+l is less than or equal to i;
the target terminal calculates the signal-to-interference-and-noise ratio SINR of the uplink data sent by the target terminal in the time frame at the access network equipment side according to the l second receiving powers and the self receiving power,
the target terminal detects whether the SINR is greater than a decoding threshold.
Optionally, when determining to transmit the uplink data of the target terminal, the target terminal transmits the uplink data in the time frame according to the transmission power corresponding to the self-received power.
Optionally, the target terminal sends the busy signal when sending the uplink data.
According to another aspect of the embodiments of the present disclosure, there is provided an uplink data transmission apparatus of an industrial wireless network, which is applied to a target terminal among n terminals, the target terminal storing channel information of n-1 other terminals, the apparatus including:
the receiving module is used for receiving a j-th total busy signal in a j-th time slot of a time frame, wherein the j-th total busy signal is formed by overlapping i active terminals in other terminals according to busy signals sent by power corresponding to the j-th time slot, the time frame comprises h time slots, j is more than or equal to 1 and less than or equal to h, h is more than or equal to n, i is more than or equal to 0 and less than or equal to n-1, and n is more than or equal to 2;
the determining module is used for determining the i active terminals according to m total busy signals received in m time slots, wherein the i active terminals are terminals for transmitting uplink data in the time frame, m is less than or equal to 2t and less than h, and t is the upper limit number of the active terminals;
And the prediction module is used for predicting whether the access network equipment can successfully receive the uplink data sent by the access network equipment in the time frame according to the channel information of the i active terminals.
Optionally, the channel information includes channel information of the active terminal to the target terminal;
the determining module is configured to determine a user state vector usv=(s) according to m total busy signals received in m time slots and the channel information 1 ,s 2 ,…,s n )；
wherein ,
optionally, the channel information includes the active terminal u i To the target terminal u c Channel information g of (2) ic ；
The determining module is configured to calculate the user state vector usv=(s) according to the following formula 1 ,s 2 ,…,s n )；
Wherein the active terminal u is set i Using power tp in the jth time slot ji Transmitting the busy signal, and the target terminal u c The j-th total busy signal received in the j-th time slot is recorded as rp j ，g ic Is the active terminal u i To the target terminal u c Channel information of (2); m is less than or equal to 2t and is less than h, and t is the upper limit number of the active terminals.
Optionally, the channel information includes a received power of the active terminal to an access network device; the prediction module comprises:
a prediction unit, configured to predict whether uplink data sent by the target terminal in the time frame can be successfully decoded by the access network device according to the received power of the i active terminals and the received power of the target terminal;
And the determining unit is used for determining to send the uplink data in the time frame when the uplink data can be successfully decoded by the access network equipment.
Optionally, the prediction unit includes:
a determining subunit, configured to determine k first received powers and l second received powers from the received powers of the i active terminals according to the self received power; the k first received powers are larger than the self received power, the l second received powers are smaller than the self received power, and k+l is less than or equal to i;
a calculating subunit, configured to calculate a signal-to-interference-and-noise ratio SINR of the uplink data sent by the target terminal in the time frame on the access network device side according to the l second received powers and the self received power,
and the detection subunit is used for detecting whether the SINR is larger than a decoding threshold gamma.
Optionally, the sending module is configured to send, when the target terminal determines to send the uplink data of the target terminal, the uplink data in the time frame according to the sending power corresponding to the self receiving power.
Optionally, the sending module is configured to send the busy signal when the target terminal sends the uplink data.
According to another aspect of the embodiments of the present disclosure, there is provided a terminal, the target terminal including: a processor; a transceiver coupled to the processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the uplink data transmission method of the industrial wireless network as described above.
According to another aspect of the disclosed embodiments, there is provided a computer-readable storage medium having at least one instruction stored therein, the instruction being loaded and executed by a processor to implement an uplink data transmission method of an industrial wireless network as described above.
According to another aspect of the disclosed embodiments, there is provided a computer program product having a computer program stored therein, the computer program being loaded and executed by a processor to implement the uplink data transmission method of an industrial wireless network as described above.
The technical scheme provided by the embodiment of the application has the beneficial effects that:
according to the method, a target terminal determines i active terminals according to m total busy signals of the first m time slots of h time slots, and predicts whether a base station can successfully receive uplink data sent by the base station in a time frame according to stored channel information of the i active terminals, wherein one time frame comprises the h time slots. Under emergency, the target terminal can determine whether uplink data can be sent in the current time frame by detecting the sending situation of active terminals in the first m time slots of the h time slots, so that the problem that the base station cannot successfully receive the uplink data sent by the target terminal due to the possible sending collision of the target terminal in the uplink sending process is avoided, and the uplink data can be timely sent to the base station in one time frame, thereby meeting the low-delay requirement of the industrial wireless network.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an operating principle of a base station using SIC technology provided in the related art;
FIG. 2 is a schematic diagram of an industrial wireless network provided in accordance with an exemplary embodiment of the present application;
fig. 3 is a flowchart of an uplink data transmission method of an industrial wireless network according to an exemplary embodiment of the present application;
fig. 4 is a flowchart of an uplink data transmission method of an industrial wireless network according to another exemplary embodiment of the present application;
fig. 5 is a schematic diagram of an uplink data transmission apparatus of an industrial wireless network according to an exemplary embodiment of the present application;
fig. 6 is a schematic diagram of an uplink data transmission apparatus of an industrial wireless network according to another exemplary embodiment of the present application;
FIG. 7 is a schematic diagram of a prediction module provided by another exemplary embodiment of the present application;
FIG. 8 is a schematic diagram of a prediction unit provided by another exemplary embodiment of the present application;
fig. 9 is a block diagram of a terminal according to an exemplary embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
First, a description will be given of several nouns related to an embodiment of the present application:
SIC technology: is an effective multi-packet reception technique (Multip Packet Reception, MPR) against interference. The base station uses SIC technology to iteratively detect multiple uplink signals, and determines the strongest uplink signal when each iteration is detected, and other uplink signals are regarded as interference. If the SINR of the strongest uplink signal is not lower than the decoding threshold, the strongest uplink signal is decoded and then removed from the mixed signal. The base station re-determines the next strongest uplink signal from the remaining uplink signals and continues decoding until all uplink signals are decoded or the iteration fails. This one-by-one decoding of the upstream signal with collision characteristics reflects the sequential detection characteristics of the SIC.
Sensing node: is a connection point in an industrial wireless network for connecting information connections between industrial equipment and base stations. The industrial wireless network comprises a base station, a sensing node and various industrial equipment. The sensor node collects operation data of the equipment operation state through the sensor, the operation data comprise various indexes when the industrial equipment operates, the operation data are converted into uplink data, and uplink signals carrying the uplink data are sent to the base station. The base station performs corresponding processing according to the uplink signals, so that information connection between the industrial equipment and the base station is established. In the present disclosure, taking a sensing node as an example of a terminal in an industrial wireless network, the number of terminals is n, and the sensing node includes a target terminal and i active terminals, i is greater than or equal to 0 and n-1.
And (3) a base station: the device is used for receiving uplink data sent by the sensing node and sending downlink data to the sensing node in the industrial wireless network. The base station is used for decoding the received uplink data and sending downlink data to the sensing node according to the decoded data, wherein the downlink data comprises processing data. And the base station processes the next operation state of the industrial equipment according to the operation data of the industrial equipment carried by the uplink data, forms processed data from the processed content, and sends the processed data to the sensing node carried by the downlink data. And then, the sensing node correspondingly adjusts the industrial equipment according to the received downlink data. The base station is also used for distributing the transmission power to each sensing node, and the sensing nodes transmit uplink data to the base station according to the transmission power.
Transmission power: is the power at which the sensing node transmits uplink data to the base station. In the embodiment of the application, the transmission power of each sensing node is preset, and the transmission powers of different sensing nodes can be the same or different. The sending power of the sensing node can be configured when the sensing node leaves the factory, or can be statically distributed by the base station at the beginning of use or in a period of time.
Received power: is the power of the uplink data received by the base station. In the industrial wireless network, since the location of each sensing node is fixed and known, channel information from each sensing node to the base station is also relatively fixed, and the transmission power of each sensing node for transmitting uplink data is also fixed and known, so that the reception power of the base station for receiving uplink data transmitted by each sensing node is relatively fixed.
Time frame: is the basic time unit at the time of data transmission. Each time frame has the same size, and adjacent time frames are connected end to end, and no gap exists.
Time slot: is a smaller time unit than the time frame. Each time frame comprises h time slots, the sizes of the h time slots are the same, and adjacent time slots are connected end to end, so that no gap exists.
In the industrial wireless network, the uplink signals received by the base station are mixed signals formed by superposition, and the mixed signals are signals formed by superposition of the uplink signals sent by the plurality of sensing nodes. And the base station detects whether the base station can successfully decode the uplink signals in the mixed signals according to the received power corresponding to the plurality of uplink signals through the SIC technology. The base station decodes one of the uplink signals and treats the other uplink signals as interference. Otherwise, once uplink signals sent by multiple sensing nodes to the base station simultaneously overlap, collision can occur, and the base station fails to receive.
Illustratively, as shown in FIG. 1, an industrial wireless network includes two sensing nodes, and the sensing nodes are exemplified as terminals, i.e., the industrial wireless network includes a base station 101. Terminal 1 and terminal 2. Terminal 1 transmits uplink signal 1 carrying uplink data to the base station, terminal 2 transmits uplink signal 2 carrying uplink data to base station 101, and base station 101 receives uplink signal 1 and uplink signal 2, and receives signal n and signal n 0 The superimposed mixed signal, the base station 101 decodes the two uplink signals using the SIC technique.
The received power corresponding to the uplink signal 1 is RP 1 Received power RP 1 Is the power at which the base station 101 receives the uplink signal 1. The corresponding received power of the uplink signal 2 is RP 2 Received power rp 2 Is the power at which the base station 101 receives the uplink signal 2. Assume RP 1 ≥RP 2 The uplink signal 1 is the strongest of the two uplink signals and the base station regards the uplink signal 2 as interference. When the SINR of terminal 1 1 Satisfy the following requirementsWhere γ is a decoding threshold, uplink signal 1 can be received by base station 101 and can be successfully decoded. Base station 101 removes uplink signal 1 from the mixed signal, the remaining mixed signal including uplink signal 2 and ambient noise n 0 . When the SINR of terminal 2 2 Satisfy->At this time, the uplink signal 2 can be received by the base station 101 and can be successfully decoded, so that the base station 101 successfully receives the uplink signals transmitted by the terminals 1 and 2.
In the related art, the use of SIC technology by a base station is implemented based on a centralized scheduling of sensing nodes, that is, when each time frame starts to transmit, the base station firstly inquires whether the sensing nodes have transmission requirements, and then decides to allocate transmission power to the sensing nodes with transmission requirements according to the transmission requirements of the sensing nodes. The sensing node transmits uplink data to the base station according to the allocated transmission power, the base station receives the uplink data, and the SIC technology is used for decoding the uplink data according to the received power of the received uplink data. The sensing node generally has a transmission requirement under an emergency condition, and because the related technology performs centralized scheduling according to a time frame unit, the sensing node may need to wait for a time frame to perform uplink transmission, and cannot meet the low-delay requirement of the industrial wireless network.
The embodiment of the application provides an uplink data transmission method, an uplink data transmission device and a storage medium of an industrial wireless network, which can be used for solving the problems in the related art. In some embodiments of the present application, the target terminal estimates whether the base station can successfully receive the uplink data sent by the target terminal in the selected time slot according to the sending condition of the detected active terminal and the condition of receiving the uplink data by calculating the base station side, so as to determine whether to send the uplink data in the current time frame. On one hand, a terminal self-scheduling mode is adopted, and a base station is not required to perform centralized scheduling; on the other hand, a scheduling manner at a time slot level is realized, and is not a scheduling manner at a time frame level.
Fig. 2 shows a schematic structural diagram of an industrial wireless network according to an exemplary embodiment of the present application, where a terminal is used as a sensing node, and a base station is used as an access network device, and the industrial wireless network includes n terminals and one base station 201.
The base station 201 is configured to receive uplink data transmitted from i active terminals and the target terminal 202, and can decode the received uplink data through SIC technology. In an alternative embodiment, the base station 201 is further configured to allocate transmit power to n terminals at the beginning of use or during a period of time. The transmission power allocated to n terminals does not change for a long period of time, i.e., in the long period of time, the n terminals transmit uplink data to the base station according to the allocated transmission power; alternatively, the transmission power of n terminals is not changed after being allocated by the base station 201.
The n terminals include the target terminal 202 and the other n-1 terminals, there being i active terminals in the n-1 terminals. An active terminal is a terminal that is transmitting uplink data to a base station. The target terminal 202 is a terminal that prepares to transmit uplink data to a base station. The n terminals are distributed according to a certain position, and the distances between the adjacent terminals may be the same or different, and the position of each terminal is fixed, so that the channel information from each terminal to the base station 201 is (approximately) relatively fixed. The target terminal 202 is located at a fixed position among n terminals, and the target terminal 202 stores the transmission power of the n terminals including itself, and the reception power of the active terminal to the base station, and the channel information of the n terminals to the base station 201, and the channel information of the other n-1 terminals to the target terminal 202. The target terminal 202 is configured to determine a time slot for transmitting uplink data according to the stored channel information and the busy signal in the reception control channel.
I active terminals of the n-1 terminals transmit uplink data to the base station 201 in a time slot. The time slot is a small time unit, the time slot is located in the time frame 203, the time frame 203 is also a time unit, the size of each time frame 203 is the same, and each time frame 203 includes h time slots. There may be an unlimited number of terminals transmitting uplink data to the base station 201 in one time slot. When i active terminals transmit uplink data to the base station 201, the i active terminals simultaneously transmit a busy signal in a control channel for transmitting the uplink data, the busy signal indicating that a terminal that needs to transmit the uplink data is transmitting the uplink data to the base station.
In some embodiments of the present application, the target terminal determines i active terminals according to the received m total busy signals of the m time slots, so as to determine whether the current time frame can perform self transmission, if so, the target terminal needs to send its uplink data in the time frame.
Fig. 3 is a flowchart of an uplink data transmission method of an industrial wireless network according to an exemplary embodiment of the present application, where the method may be applied to the industrial wireless network shown in fig. 2, and the method uses a terminal as a sensing node and a base station as an access network device, where the method is applied to a target terminal of n terminals, where the target terminal stores channel information of n-1 other terminals, and includes:
In step 301, the target terminal receives a j-th total busy signal in a j-th time slot of a time frame, wherein the j-th total busy signal is formed by overlapping i active terminals in other terminals according to busy signals sent by power corresponding to the j-th time slot, the time frame comprises h time slots, j is greater than or equal to 1 and less than or equal to h, h is greater than or equal to n, i is greater than or equal to 0 and less than or equal to n-1, and n is greater than or equal to 2.
The time frame comprises h time slots, and the sizes of the h time slots are the same, namely the h time slots are equally divided into one time frame.
The target terminal receives the j-th total busy signal in the j-th time slot of the time frame through the radio frequency signal power detection function, wherein the j-th total busy signal is formed by superposing the busy signal transmitted by the i active terminals in other terminals according to the power corresponding to the j-th time slot. That is, in different time slots, the transmission power of each active terminal transmitting the busy signal in the control channel is predetermined, and the transmission power of different active terminals transmitting the busy signal may be different. Optionally, the power of the j total busy signal of the j time slot received by the target terminal may be the same as or different from the power of the total busy signal received by other time slots.
The busy signal is used for identifying an active terminal which is transmitting uplink data to the base station in the n terminals, namely the active terminal informs the target terminal that the terminal is transmitting uplink data by transmitting the busy signal.
Step 302, the target terminal determines i active terminals according to m total busy signals received in m time slots, wherein the i active terminals are terminals transmitting uplink data in a time frame, m is less than or equal to 2t < h, and t is the upper limit number of the active terminals.
The target terminal stores channel information of n-1 other terminals. The channel information of the n-1 other terminals includes channel information of i active terminals, which are terminals transmitting uplink data in a time frame, to the target terminal.
The target terminal determines i active terminals according to m total busy signals received in m time slots and channel information from n-1 other terminals to the target terminal.
In step 303, the target terminal predicts whether the base station can successfully receive the uplink data sent by itself in the time frame according to the channel information of the i active terminals.
Each terminal transmitting uplink data to the base station acquires a predetermined transmission power before transmitting the uplink data.
Optionally, the manner in which the terminal obtains the predetermined transmission power includes three manners as follows:
firstly, when a terminal is manufactured, a designer designs the transmitting power of the hardware circuit capable of normal operation through the design of the hardware circuit;
Secondly, at the beginning of the operation and use of the industrial wireless network, the base station distributes the transmission power to the terminal, and the transmission power of the terminal is unchanged all the time;
third, in the operation of the industrial wireless network, the base station allocates the transmission power to the terminal for a longer period of time according to the operation requirement, the transmission power of the terminal is unchanged for a longer period of time, and the subsequent transmission power can be obtained after being allocated again by the base station.
The manner in which the terminal obtains the predetermined transmission power is any one of the above three manners, and the manner in which the terminal obtains the predetermined transmission power includes, but is not limited to, the above three manners.
The channel information of the n-1 other terminals includes channel information of the n-1 other terminals to the base station.
And the target terminal calculates the received power of i active terminals, which can be received by the base station, of uplink data sent by i active terminals according to the stored transmission power of n-1 other terminals and the stored channel information from the n-1 other terminals to the base station, and stores the received power of i active terminals, wherein the received power of i active terminals belongs to the channel information. The target terminal calculates the self-receiving power which can be received by the base station when the target terminal transmits the uplink data according to the self-transmitting power and the channel information from the target terminal to the base station, and stores the self-receiving power.
And the target terminal determines the condition that the i active terminals in the first m time slots of the h time slots send uplink data according to the received power of the i active terminals and the received power of the target terminal, and predicts whether the uplink data sent by the target terminal in the current time frame is successfully received by the base station or not through the SIC technology. If the target terminal predicts that the base station can successfully receive the uplink data sent by the target terminal in the current time frame, the target terminal determines that the uplink data sent by the target terminal cannot collide with the uplink data sent by the i active terminals, and the target terminal sends the uplink data of the target terminal in the current time frame; if the target terminal predicts that the base station cannot successfully receive the uplink data sent by the target terminal in the current time frame, the target terminal determines that the uplink data sent by the target terminal collides with the uplink data sent by the i active terminals, and the target terminal pushes the target terminal to send the uplink data of the target terminal in the next time frame.
In summary, in the method provided in this embodiment, the target terminal determines i active terminals according to m total busy signals of the first m time slots of the h time slots, and predicts whether the base station can successfully receive uplink data sent by itself in a time frame according to the stored channel information of the i active terminals, where a time frame includes the h time slots. Under emergency, the target terminal can determine whether uplink data can be sent in the current time frame by detecting the sending situation of active terminals in the first m time slots of the h time slots, so that the problem that the base station cannot successfully receive the uplink data sent by the target terminal due to the possible sending collision of the target terminal in the uplink sending process is avoided, and the uplink data can be timely sent to the base station in one time frame, thereby meeting the low-delay requirement of the industrial wireless network.
Fig. 4 is a flowchart of an uplink data transmission method of an industrial wireless network according to another exemplary embodiment of the present application, where the method may be applied to the industrial wireless network shown in fig. 2, and the method uses a terminal as a sensing node and a base station as an access network device, where the method is applied to a target terminal of n terminals, where the target terminal stores channel information of n-1 other terminals, and includes:
in step 401, the target terminal receives the j-th total busy signal in the j-th time slot of the time frame, where the j-th total busy signal is formed by overlapping i active terminals in other terminals according to the busy signal sent by the power corresponding to the j-th time slot, the time frame includes h time slots, j is greater than or equal to 1 and less than or equal to h, h is greater than or equal to n, i is greater than or equal to 0 and less than or equal to n-1, and n is greater than or equal to 2.
The time frame comprises h time slots, and the sizes of the h time slots are the same, namely the h time slots are equally divided into one time frame.
The target terminal receives the j-th total busy signal in the j-th time slot of the time frame through the radio frequency signal power detection function, wherein the j-th total busy signal is formed by superposing the busy signal transmitted by the i active terminals in other terminals according to the power corresponding to the j-th time slot. That is, in different time slots, the transmission power of each active terminal transmitting the busy signal in the control channel is predetermined, and the transmission power of different active terminals transmitting the busy signal may be different. Optionally, the power of the j total busy signal of the j time slot received by the target terminal may be the same as or different from the power of the total busy signal received by other time slots.
The busy signal is used for identifying an active terminal which is transmitting uplink data to the base station in the n terminals, namely the active terminal informs the target terminal that the terminal is transmitting uplink data by transmitting the busy signal.
Step 402, the target terminal determines i active terminals according to m total busy signals received in m time slots, where i active terminals are terminals transmitting uplink data in a time frame, m is less than or equal to 2t < h, and t is the upper limit number of the active terminals.
The target terminal stores channel information of n-1 other terminals. The channel information of the n-1 other terminals includes channel information of i active terminals, which are terminals transmitting uplink data in a time frame, to the target terminal.
The target terminal determines the terminal state vector USV=(s) of n terminals according to m total busy signals received in m time slots and the channel information from n-1 other terminals to the target terminal 1 ，s 2 ，…，s n). wherein ,an active terminal is a terminal that transmits uplink data to a base station,the idle terminal is a terminal that does not transmit uplink data to the base station, and the target terminal is a terminal that is ready to transmit uplink data to the base station, so the target terminal belongs to the idle terminal.
In an alternative embodiment, the channel information includes active terminal u i To target terminal u c Channel information g of (2) ic . The target terminal calculates the terminal state vectors usv=(s) of the n terminals according to the following formula 1 ，s 2 ，…，s n )：
Wherein, an active terminal u is set i u i Using power tp in the jth time slot ji Transmitting busy signal, target terminal u c The j-th total busy signal received in the j-th time slot is recorded as rp j ，g ic Is an active terminal u i To target terminal u c And the channel information m is less than or equal to 2t and is smaller than h, and t is the upper limit number of the active terminals.
In step 403, the target terminal predicts whether the uplink data sent by the target terminal in the time frame can be successfully decoded by the access network device according to the received power of the i active terminals and the received power of the target terminal.
Each terminal transmitting uplink data to the base station acquires a predetermined transmission power before transmitting the uplink data.
Optionally, the manner in which the terminal obtains the predetermined transmission power includes three manners as follows:
firstly, when a terminal is manufactured, the transmitting power of the hardware circuit which can normally work is obtained through the design of the hardware circuit;
secondly, at the beginning of the operation and use of the industrial wireless network, the base station distributes the transmission power to the terminal, and the transmission power of the terminal is unchanged all the time;
Third, in the operation of the industrial wireless network, the base station allocates the transmission power to the terminal for a longer period of time according to the operation requirement, the transmission power of the terminal is unchanged for a longer period of time, and the subsequent transmission power can be obtained after being allocated again by the base station.
The manner in which the terminal obtains the predetermined transmission power is any one of the above three manners, and the manner in which the terminal obtains the predetermined transmission power includes, but is not limited to, the above three manners.
The channel information of the n-1 other terminals includes channel information of the n-1 other terminals to the base station.
And the target terminal calculates the received power of i active terminals, which can be received by the base station, of uplink data sent by i active terminals according to the stored transmission power of n-1 other terminals and the stored channel information from the n-1 other terminals to the base station, and stores the received power of i active terminals, wherein the received power of i active terminals belongs to the channel information. The target terminal calculates the self-receiving power which can be received by the base station when the target terminal transmits the uplink data according to the self-transmitting power and the channel information from the target terminal to the base station, and stores the self-receiving power.
The target terminal orders the received power of the i active terminals and the received power of the target terminal, and determines k first received powers and l second received powers from the received power of the i active terminals according to the received power of the target terminal. k first received powers are larger than the self received power, and l second received powers are smaller than the self received power, wherein k+l is less than or equal to i. And the target terminal determines the situation that the i active terminals send uplink data in the first m time slots of the h time slots according to the received power of the i active terminals and the received power of the target terminal and the SIC technology, and detects whether the target terminal can send the uplink data in the current time frame. Whether the target terminal can send uplink data in the current time frame depends on whether the target terminal determines whether the uplink data of the target terminal, which is sent by the target terminal in the current time frame, can be successfully decoded by the base station, namely whether the uplink data of the target terminal, which is sent by the target terminal in the current time frame, collides with the uplink data sent by the i active terminals, if so, the uplink data sent by the target terminal cannot be successfully received by the base station, otherwise, the uplink data sent by the target terminal can be successfully received by the base station.
And the target terminal calculates SINR of the uplink data of the target terminal on the base station side, which is transmitted by the target terminal in the current time frame, according to the l second receiving powers and the self receiving powers. The SINR that the target terminal sends uplink data that can be decoded by the base station satisfies the following equation:
wherein, the target terminal u c The total busy signal for transmitting uplink data in the time frame is denoted as RPc, n 0 For ambient noise, γ is the decoding threshold.
The target terminal detects whether the SINR is greater than the decoding threshold according to the above formula, and when the target terminal detects that the SINR is greater than the decoding threshold, the process goes to step 404; when the target terminal detects that the SINR is not greater than the decoding threshold, the target terminal determines that the base station cannot successfully receive the uplink data sent by itself in the current time frame.
In step 404, the target terminal determines to transmit the uplink data in the time frame when it is determined that the uplink data can be successfully decoded by the base station.
In step 405, when determining to transmit the uplink data of the target terminal, the target terminal transmits the uplink data in the time frame according to the transmission power corresponding to the self-received power.
And the target terminal determines that the target terminal transmits the uplink data of the target terminal in the current time frame according to the self receiving power and the SIC technology, and the target terminal transmits the uplink data in the current time frame.
In step 406, the target terminal transmits a busy signal when transmitting uplink data.
The target terminal transmits uplink data in a time slot in a time frame, and transmits a busy signal on a control channel for transmitting the uplink data, wherein the busy signal is used for identifying that the target terminal is transmitting the uplink data to the base station, and the target terminal becomes an active terminal.
In summary, in the method provided in this embodiment, the target terminal determines i active terminals according to m total busy signals of the first m time slots of the h time slots, and predicts whether the base station can successfully receive uplink data sent by itself in a time frame according to the stored channel information of the i active terminals, where a time frame includes the h time slots. Under emergency, the target terminal can determine whether uplink data can be sent in the current time frame by detecting the sending situation of active terminals in the first m time slots of the h time slots, so that the problem that the base station cannot successfully receive the uplink data sent by the target terminal due to the possible sending collision of the target terminal in the uplink sending process is avoided, and the uplink data can be timely sent to the base station in one time frame, thereby meeting the low-delay requirement of the industrial wireless network.
In the method provided in this embodiment, the target terminal calculates terminal state vectors of n terminals according to the stored channel information and the received m total busy signals by using a formula, and determines i active terminals through the terminal state vectors, thereby determining whether the target terminal itself can transmit uplink data in a time frame.
In the method provided in this embodiment, the target terminal predicts whether uplink data of itself can be successfully received by the base station when sending to the base station in a time frame according to the received power of i active terminals and the received power of itself.
In the method provided by the embodiment, the target terminal sends the busy signal when sending the uplink data, and the busy signal identifies itself to other terminals ready for sending the uplink data as belonging to the active terminal, and the other terminals ready for sending the uplink data are prevented from colliding when sending the uplink data.
The following are examples of the apparatus of the present application that may be used to perform the method embodiments of the present application. For details not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the method of the present application.
Fig. 5 is a schematic diagram of an uplink data transmission apparatus of an industrial wireless network according to an exemplary embodiment of the present application, where the apparatus is applied to a target terminal among n terminals, and the target terminal stores channel information of n-1 other terminals, and the apparatus includes:
The receiving module 510 is configured to receive, in a jth time slot of a time frame, a jth total busy signal, where the jth total busy signal is formed by overlapping busy signals sent by i active terminals in other terminals according to power corresponding to the jth time slot, the time frame includes h time slots, where j is greater than or equal to 1 and less than or equal to h, h is greater than or equal to n,0 and less than or equal to i is greater than or equal to n-1, and n is greater than or equal to 2.
The determining module 520 is configured to determine, according to m total busy signals received in m time slots, i active terminals, where i active terminals are terminals transmitting uplink data in a time frame, m is less than or equal to 2t < h, and t is the upper limit number of the active terminals.
And the prediction module 530 is configured to predict whether the access network device can successfully receive the uplink data sent by the access network device in the time frame according to the channel information of the i active terminals.
Fig. 6 is a schematic diagram of an uplink data transmission apparatus of an industrial wireless network according to another exemplary embodiment of the present application, which is applied to a target terminal among n terminals, the target terminal storing channel information of n-1 other terminals, the apparatus comprising:
the receiving module 610 is configured to receive, in a jth time slot of a time frame, a jth total busy signal, where the jth total busy signal is formed by overlapping busy signals sent by i active terminals in other terminals according to power corresponding to the jth time slot, the time frame includes h time slots, where j is greater than or equal to 1 and less than or equal to h, h is greater than or equal to n,0 and less than or equal to i is greater than or equal to n-1, and n is greater than or equal to 2.
The determining module 620 is configured to determine, according to m total busy signals received in m time slots, i active terminals, where i active terminals are terminals transmitting uplink data in a time frame, m is less than or equal to 2t < h, and t is the upper limit number of the active terminals.
Optionally, the channel information includes active terminal to target terminal channel information.
A determining module 620, configured to determine a user state vector usv=(s) according to m total busy signals and channel information received in m time slots 1 ,s 2 ,…,s n )。
wherein ,
optionally, the channel information comprises active terminal u i To target terminal u c Channel information g of (2) ic 。
A determining module 620, configured to calculate a user state vector usv=(s) according to the following formula 1 ，s 2 ，…，s n )：
Wherein, the active terminal is set to use the power tp in the jth time slot ji Transmitting busy signal, target terminal u c The j-th total busy signal received in the j-th time slot is recorded as rp j ，g ic Is an active terminal u i To target terminal u c Channel information of (2); m is less than or equal to 2t and is less than h, and t is the upper limit number of the active terminals.
And the prediction module 630 is configured to predict whether the access network device can successfully receive the uplink data sent by the access network device in the time frame according to the channel information of the i active terminals.
Optionally, the channel information comprises a received power of the active terminal to the access network device. As shown in fig. 7, the prediction module 630 includes:
and the prediction unit 631 is configured to predict whether uplink data sent by the target terminal in the time frame can be successfully decoded by the access network device according to the received power of the i active terminals and the received power of the target terminal.
A determining unit 632 is configured to determine to send the uplink data in the time frame when it is determined that the uplink data can be successfully decoded by the access network device.
Alternatively, as shown in fig. 8, the prediction unit 631 includes:
a determining subunit 6311, configured to determine, according to the received power, k first received powers and l second received powers from the received powers of i active terminals. k first received powers are larger than the self received power, and l second received powers are smaller than the self received power, wherein k+l is less than or equal to i.
A calculating subunit 6312, configured to calculate, according to the i second received powers and the own received powers, a signal-to-interference-and-noise ratio SINR of uplink data sent by the target terminal in the time frame on the access network device side,
a detection subunit 6313 is configured to detect whether the signal-to-interference-and-noise ratio is greater than a decoding threshold.
Optionally, the sending module 640 is configured to send, when determining to send the uplink data of the sending module, the uplink data in a time frame according to the sending power corresponding to the receiving power of the sending module.
Optionally, the sending module 640 is configured to send a busy signal when sending uplink data.
The relevant details may be combined with the method embodiments shown with reference to fig. 3 and 4. The receiving module 610 is further configured to implement functions related to any other implicit or explicit receiving steps in the above method embodiments; the determining module 620 is further configured to implement functions related to any other implicit or explicit determining steps in the above method embodiments; the prediction module 630 is further configured to implement functions related to any other implicit or explicit prediction steps in the method embodiments described above.
It should be noted that: the uplink data transmission device of the industrial wireless network provided in the above embodiment is only exemplified by the division of the above functional modules, and in practical application, the above functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the uplink data transmission device of the industrial wireless network provided in the foregoing embodiment and the method embodiment of the uplink data transmission method of the industrial wireless network belong to the same concept, and detailed implementation processes of the method embodiment are described in the method embodiment, which is not repeated herein.
Fig. 8 shows a block diagram of a terminal 800 according to an exemplary embodiment of the present application. For example, the terminal 800 may be any one of n terminals. As shown in fig. 8, the terminal 800 may include: a processor 81, a receiver 82, a transmitter 83 and a memory 84. The receiver 82, the transmitter 83 and the memory 84 are connected to the processor 81 via a bus 85, respectively.
The processor 81 includes one or more processing cores, and the processor 81 executes the method executed by the target terminal in the uplink data transmission method of the industrial wireless network provided by the embodiment of the present disclosure by running the application module 86 and the processing module 861, the transmitting module 862, and the receiving module 863. The memory 84 may be used to store application modules 86 as well as processing modules 861, sending modules 862, receiving modules 863. In particular, the memory 84 may store application program modules 86 required for at least one function. The receiver 82 is configured to receive communication data transmitted by other devices, and the transmitter 83 is configured to transmit communication data to other devices.
In an exemplary embodiment, there is also provided a computer readable storage medium, which is a non-volatile computer readable storage medium, in which a computer program is stored, the stored computer program being capable of implementing the uplink data transmission method of the industrial wireless network provided in the above-mentioned embodiments of the present disclosure when being executed by a processing component.
The disclosed embodiments also provide a computer program product having instructions stored therein that, when run on a computer, enable the computer to perform the method of uplink data transmission of an industrial wireless network provided by the disclosed embodiments.
It should be understood that references herein to "a plurality" are to two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.

Claims (10)

1. An uplink data transmission method of an industrial wireless network, which is applied to a target terminal of n terminals, wherein the target terminal stores channel information of n-1 other terminals, and the method comprises:
the target terminal receives a j-th total busy signal in a j-th time slot of a time frame, wherein the j-th total busy signal is formed by overlapping i active terminals in other terminals according to busy signals sent by power corresponding to the j-th time slot, the time frame comprises h time slots, j is more than or equal to 1 and less than or equal to h, h is more than or equal to n, i is more than or equal to 0 and less than or equal to n-1, and n is more than or equal to 2;
the target terminal determines the i active terminals according to m total busy signals received in m time slots, wherein the i active terminals are terminals transmitting uplink data in the time frame, m is less than or equal to 2t and less than h, and t is the upper limit number of the active terminals;
and the target terminal predicts whether the access network equipment can successfully receive the uplink data sent by the target terminal in the time frame according to the channel information of the i active terminals.
2. The method of claim 1, wherein the channel information comprises channel information of the active terminal to the target terminal;
The target terminal determines the i active terminals according to m total busy signals received in m time slots, including:
the target terminal determines a terminal state vector usv=(s) according to m total busy signals received in m time slots and the channel information 1 ，s 2 ，…，s n )；
wherein ,
3. the method according to claim 2, wherein the channel information comprises the active terminal u i To the target terminal u c Channel information g of (2) ic ；
The target terminal calculates the terminal state vector USV=(s) according to the following formula 1 ，s 2 ，…，s n )；
Wherein the active terminal u is set i Using power tp in the jth time slot ji Transmitting the busy signal, and the target terminal u c The received power of the j-th total busy signal received in the j-th time slot is recorded as rp j ，g ic Is the active terminal u i To the target terminal u c Is set in the channel information of the mobile terminal).
4. A method according to any of claims 1 to 3, characterized in that the channel information comprises the received power of the active terminal to access network device;
the target terminal predicts whether the access network device can successfully receive the uplink data sent by the target terminal in the time frame according to the channel information of the i active terminals, and comprises the following steps:
The target terminal predicts whether uplink data sent by the target terminal in the time frame can be successfully decoded by the access network equipment according to the received power of the i active terminals and the received power of the target terminal;
and the target terminal determines to send the uplink data in the time frame when determining that the uplink data can be successfully decoded by the access network equipment.
5. The method according to claim 4, wherein the target terminal predicts whether uplink data transmitted by the target terminal in the time frame can be successfully decoded by the access network device according to the received power of the i active terminals and the received power of the target terminal, comprising:
the target terminal determines k first receiving powers and l second receiving powers in the receiving powers of the i active terminals according to the self receiving power; the k first received powers are larger than the self received power, the l second received powers are smaller than the self received power, and k+l is less than or equal to i;
the target terminal calculates the signal-to-interference-and-noise ratio SINR of the uplink data sent by the target terminal in the time frame at the access network equipment side according to the l second receiving powers and the self receiving power,
wherein ,RPc Receiving power at the network device of a total busy signal for the target terminal to transmit uplink data in the time frame, RP 1 The corresponding received power, RP, of the uplink signal 1 transmitted for the terminal 1 at said network device 2 The corresponding received power, RP, of the uplink signal 2 transmitted for the terminal 2 at said network device n Receiving power, n, corresponding to the uplink signal n sent by the terminal n at the network device 0 Is ambient noise;
the target terminal detects whether the SINR is greater than a decoding threshold γ.
6. The method according to claim 1, wherein the target terminal predicts whether the access network device can successfully receive the uplink data sent by itself in the time frame according to the channel information of the i active terminals, and further comprises:
and when the target terminal determines to transmit the uplink data, the target terminal transmits the uplink data in the time frame according to the transmission power corresponding to the self-receiving power.
7. The method according to claim 1, wherein the method further comprises:
and the target terminal transmits the busy signal when transmitting the uplink data.
8. An uplink data transmission apparatus of an industrial wireless network, which is applied to a target terminal among n terminals, the target terminal storing channel information of n-1 other terminals, the apparatus comprising:
The receiving module is used for receiving a j-th total busy signal in a j-th time slot of a time frame, wherein the j-th total busy signal is formed by overlapping i active terminals in other terminals according to busy signals sent by power corresponding to the j-th time slot, the time frame comprises h time slots, j is more than or equal to 1 and less than or equal to h, h is more than or equal to n, i is more than or equal to 0 and less than or equal to n-1, and n is more than or equal to 2;
the determining module is used for determining the i active terminals according to m total busy signals received in m time slots, wherein the i active terminals are terminals for transmitting uplink data in the time frame, m is less than or equal to 2t and less than h, and t is the upper limit number of the active terminals;
and the prediction module is used for predicting whether the access network equipment can successfully receive the uplink data sent by the access network equipment in the time frame according to the channel information of the i active terminals.
9. A terminal, wherein the target terminal comprises:
a processor;
a transceiver coupled to the processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to implement the method of uplink data transmission of an industrial wireless network as claimed in any one of the preceding claims 1 to 7.
10. A computer readable storage medium having stored therein at least one instruction that is loaded and executed by a processor to implement the method of uplink data transmission in an industrial wireless network according to any one of claims 1 to 7.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1936827A2 (en) * 2005-07-21 2008-06-25 Qualcomm Incorporated Multiplexing and feedback support for wireless communication system
CN102497654A (en) * 2011-12-07 2012-06-13 西安电子科技大学 Hidden node concurrent receiving method based on busy tone for removing ACK (acknowledgement character) frame interference
WO2016184307A1 (en) * 2015-05-15 2016-11-24 中兴通讯股份有限公司 Uplink resource allocation method, base station and user terminal
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