CN106658730B - Transmission method with low control overhead - Google Patents
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Abstract
The invention provides a data transmission method with low control overhead, which comprises that a first node allocates a first shared sending resource which is divided into a first sending resource and a second sending resource in terms of time for a second node, and a first spreading code word set and a second spreading code word set are allowed to be used on the first sending resource and the second sending resource; and the second node randomly selects a spread spectrum code word A from the first spread spectrum code word set, and selects a group of spread spectrum code word subsets containing X spread spectrum code words from the second spread spectrum code word set according to A. The second node sends A on the first sub-sending resource, and sends Y-bit data to be transmitted after spreading on the second sub-sending resource by adopting the spreading code words; and the first node receives the A, obtains the channel information of the second node and the first node through the A, obtains the spread spectrum code word subset used on the second sub-sending resource through the A, and decodes the Y-bit data by using the channel information and the spread spectrum code word subset. The invention can effectively increase the robustness of data transmission.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a data transmission method in a fifth generation wireless communication system.
Background
With the rise of intelligent terminals and the abundance of wireless data application services, the number of data users in a wireless communication system is greatly increased, the data content is no longer limited to traditional characters or images, and the demands of users for multimedia services such as high-definition videos and mobile televisions are more and more in the future, so that the wireless network flow shows an explosive growth situation. According to the forecast of market mechanisms, in the next 10 years, the wireless data service will increase by 500-1000 times, and the average annual increase is 1.6-2 times, which puts higher requirements on the network capacity of a wireless communication system.
In 2020 and the future, mobile internet and internet of things services will become the main driving force for the development of mobile communication. The 5G can meet diversified business requirements of people in various areas such as residence, work, leisure and traffic, and can provide extremely-sophisticated business experience such as ultra-high-definition video, virtual reality, augmented reality, cloud desktops and online games for users even in scenes with ultra-high traffic density, ultra-high connection number density and ultra-high mobility characteristics such as dense residential areas, offices, stadiums, outdoor gatherings, subways, expressways, high-speed rails and wide area coverage. Meanwhile, 5G can permeate into the fields of the Internet of things and various industries, is deeply integrated with industrial facilities, medical instruments, vehicles and the like, effectively meets the diversified business requirements of the vertical industries such as industry, medical treatment, transportation and the like, and realizes real 'everything interconnection'.
The 5G can solve the challenges brought by the differentiated performance indexes in diversified application scenes, the performance challenges in different application scenes are different, and the user experience rate, the traffic density, the time delay, the energy efficiency and the connection number can become the challenging indexes in different scenes. From the main application scenes, business requirements and challenges of the mobile internet and the internet of things, four 5G main technical scenes of continuous wide area coverage, high hotspot capacity, low power consumption, large connection and low time delay and high reliability can be summarized.
The current uplink transmission mechanism requires that a terminal firstly sends scheduling request information, then a base station allocates bandwidth request resources to the terminal based on the scheduling request information, the terminal sends the bandwidth request information to the base station through the bandwidth request resources, and then the base station allocates uplink data transmission resources to the terminal based on the bandwidth request information. For the application scenario of large-scale machine communication, this approach may cause a signaling storm that the system cannot endure, so it is necessary to reduce the system control overhead as much as possible.
Disclosure of Invention
The invention aims to solve the problems of large control overhead and the like of large-scale machine communication data transmission in a fifth generation wireless communication system and provides a data transmission method with low control overhead.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a data transmission method with low control overhead comprises the following steps: 1) a first communication node allocates a first shared transmission resource for a second communication node, the first shared transmission resource is shared by the second communication node and other second communication nodes, the first shared transmission resource is divided into two parts, namely a first sub-transmission resource and a second sub-transmission resource, in time, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, and the first communication node allocates a first shared transmission resource for the second communication node, the first shared transmission resource is shared by the second communication node and other second communication nodes, the time domain length ofThe spreading code word set allowed to be used on the two sub-transmission resources is a second spreading code word set, the length L1 of the spreading code words in the first spreading code word set is greater than the length L2 of the spreading code words in the second spreading code word set, the spreading code words in the first spreading code word set are orthogonal, the spreading code words in the second spreading code word set are quasi-orthogonal, the first communication node receives data on the first shared transmission resource by using T receiving antennas, and T is 2SS is an integer greater than or equal to 6; 2) the second communication node randomly selects a spreading code word a from the first spreading code word set, selects a group of spreading code word subsets from the second spreading code word set according to the spreading code word a, where the spreading code word subsets include X spreading code words, the second communication node transmits the spreading code words a on the first sub-transmission resource, and transmits Y-bit data to be transmitted on the second sub-transmission resource after spreading the Y-bit data by using the spreading code words in the spreading code word subsets, where X is an integer greater than or equal to 1, Y is an integer greater than or equal to 16, and the Y-bit data at least includes identification information of the second communication node; 3) the first communication node receives a spread spectrum code word a sent by the second communication node from the first sub-sending resource, obtains channel information of the second communication node and the first communication node through the spread spectrum code word a, and obtains a spread spectrum code word subset used by the second communication node on the second sub-sending resource through the spread spectrum code word a, and the first communication node decodes the Y-bit data sent by the second communication node on the second sub-sending resource by using the channel information and the spread spectrum code word subset.
Further, the length L2 of the spreading code word is equal to max (1024/T,1), and when L2 is 1, the second spreading code word set only includes a code word sequence with a value of 1.
Further, the first spreading code word set includes two sub-spreading code word sets, which are called a first sub-spreading code word set and a second sub-spreading code word set, and the intersection of the two sets is null, if the spreading code word a belongs to the first sub-spreading code word set, the X is equal to 1, and if the spreading code word a belongs to the second sub-spreading code word set, the X is equal to 2.
Further, if the second communication node transmits a first-pass data packet, the spreading code word a is selected from the first set of sub-spreading code words, and if the second communication node transmits a retransmission data packet, the spreading code word a is selected from the second set of sub-spreading code words.
Further, the second communication node uses the maximum transmission power to transmit the spreading code word a on the first sub-transmission resource, and randomly selects a power value within a power value range notified by the first communication node through signaling to transmit the Y-bit data on the second sub-transmission resource.
Further, the second communication node randomly selects a power value within a power value range notified by the first communication node through signaling to transmit the spread spectrum codeword a on the first sub-transmission resource and transmit the Y-bit data on the second sub-transmission resource.
Further, the first shared resource is periodically allocated, if the second communication node does not receive the reception success information sent by the first communication node when sending the Y-bit data on the first shared resource for Z times, the second communication node stops sending the data on the first shared resource, and sends the Y-bit data and the location information of the second communication node on a second shared sending resource allocated by the first communication node, where the second shared sending resource is larger than the first shared sending resource, a configuration period of the second shared sending resource is Z times of the first shared sending resource, and Z is an integer greater than or equal to 4.
Further, the spectral efficiency of the modulation and coding scheme used by the second communication node on the second shared transmission resource is lower than the spectral efficiency of the modulation and coding scheme used by the second communication node on the first shared transmission resource.
Further, if the first communication node successfully decodes the Y-bit data of the second communication node on the second shared transmission resource and the location information of the second communication node, the first communication node determines, according to the location information of the second communication node, whether a third communication node that is not in a working state exists within a range where a physical distance from the first communication node to the second communication node is less than 50 meters, and if so, the first communication node notifies the third communication node of being in the working state through signaling, and requests the second communication node to switch to the third communication node, where the third communication node and the first communication node may perform bidirectional data communication with a spectral efficiency of not less than 8 bits/Hz.
Further, the first communication node receives data on the second shared transmission resource by using P × T receiving antennas, where P is an integer greater than or equal to 2.
The invention has the beneficial effects that: the invention provides a data transmission method with low control overhead, which comprises that a first node allocates a first shared sending resource which is divided into a first sending resource and a second sending resource in terms of time for a second node, wherein the first sending resource is allowed to use a first spread spectrum code word set, and the second sending resource is allowed to use a second spread spectrum code word set; and the second node randomly selects a spread spectrum code word A from the first spread spectrum code word set, and selects a group of spread spectrum code word subsets containing X spread spectrum code words from the second spread spectrum code word set according to the spread spectrum code word A. The second node transmits a spread spectrum code word A on the first sub-transmission resource, and transmits the Y-bit data to be transmitted after spreading on the second sub-transmission resource by adopting the spread spectrum code word; and the first node receives the spread spectrum code word A, obtains channel information of the second node and the first node through the spread spectrum code word A, obtains a spread spectrum code word subset used on the second sub-sending resource through the spread spectrum code word A, and decodes the Y-bit data by using the channel information and the spread spectrum code word subset. The method and the device (system) can effectively increase the robustness of data transmission, and compared with the prior art, the method and the device (system) can effectively increase the robustness of data transmission to adapt to the service requirement of a fifth generation wireless communication system.
Drawings
FIG. 1 is a flow chart of a data transmission method of the present invention;
FIG. 2 is a schematic diagram of a first shared transmission resource;
fig. 3 is a diagram of a second shared transmission resource.
Detailed description of the preferred embodiments
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
As shown in the attached figure 1, the method of the invention comprises the following steps:
102, a first communication node allocates a first shared transmission resource to a second communication node, wherein the first shared transmission resource is shared by the second communication node and other second communication nodes, the first shared transmission resource is divided into two parts in time, a first sub-transmission resource and a second sub-transmission resource, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, the length L1 of the spreading code words in the first set of spreading code words is larger than the length L2 of the spreading code words in the second set of spreading code words, the spreading code words in the first set of spreading code words are orthogonal, and the spreading code words in the second set of spreading code words are quasi-orthogonal, the first communication node receives data on the first shared transmission resource using T receive antennas, where T is 2SAnd S is an integer of 6 or more.
Example 1
The base station allocates a first shared transmission resource to the terminal a, and preferably, the base station receives data on the first shared transmission resource by using T receiving antennas, where T is a power of S of 2, and S is an integer greater than or equal to 6.
As shown in fig. 2, the first shared transmission resource is divided into two parts in time, namely a first sub-transmission resource and a second sub-transmission resource, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, the length L1 of the spreading code words in the first set of spreading code words is larger than the length L2 of the spreading code words in the second set of spreading code words, the spreading code words in the first set of spreading code words are orthogonal (for example, walsh codes), the spreading code words in the second set of spreading code words are quasi-orthogonal (for example, pseudo random number codes), and the design is to ensure that the base station can obtain the channel information of terminal a as accurately as possible, based on the information, the base station distinguishes the terminals in the space domain by using at least 256 configured receiving antennas, so that data sent by different terminals on the second sub-sending resource can be allowed to be quasi-orthogonal, and the utilization efficiency of the resource is improved.
A terminal a that needs to send uplink data randomly selects a spreading code word a from the first spreading code word set, selects a set of spreading code word subsets (e.g. predefined mapping tables) from the second spreading code word set according to the spreading code word a, where the spreading code word subsets include X spreading code words, the second communication node sends the spreading code words a on the first sub-sending resource to allow the base station to perform channel estimation, and sends Y-bit data to be transmitted on the second sub-sending resource after spreading by the spreading code words in the spreading code word subsets, where X is an integer greater than or equal to 1 and Y is an integer greater than or equal to 16, where the Y-bit data at least includes identification information of the terminal a, which is because the first shared sending resource is shared by the terminal a and other terminals, the terminal with the data transmission requirement transmits data on the first shared transmission resource, so the base station does not know which terminal is transmitting data, and therefore the base station must carry identification information.
The base station receives a spread spectrum code word A sent by a terminal A from the first sub-sending resource, obtains channel information of the second communication node and the first communication node through the spread spectrum code word A, obtains a spread spectrum code word subset used by the terminal A on the second sub-sending resource through the spread spectrum code word A, and decodes the Y-bit data sent by the terminal A on the second sub-sending resource by using the channel information and the spread spectrum code word subset.
Example 2
The base station allocates a first shared transmission resource to the terminal a, and preferably, the base station receives data on the first shared transmission resource by using T receiving antennas, where T is a power of S of 2, and S is an integer greater than or equal to 6.
As shown in fig. 2, the first shared transmission resource is divided into two parts in time, namely a first sub-transmission resource and a second sub-transmission resource, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, the length L1 of the spreading code words in the first set of spreading code words is larger than the length L2 of the spreading code words in the second set of spreading code words, the spreading code words in the first set of spreading code words are orthogonal (for example, walsh codes), the spreading code words in the second set of spreading code words are quasi-orthogonal (for example, pseudo random number codes), and the design is to ensure that the base station can obtain the channel information of terminal a as accurately as possible, based on the information, the base station distinguishes the terminals in the space domain by using at least 256 configured receiving antennas, so that data sent by different terminals on the second sub-sending resource can be allowed to be quasi-orthogonal, and the utilization efficiency of the resource is improved.
Preferably, the length L2 of the spreading code word is equal to max (1024/T,1), and when L2 takes a value of 1, the second spreading code word set only includes a code word sequence taking a value of 1, so the design reason is that when the receiving antennas configured by the base station are increased step by step, the base station can obtain a higher receiving beamforming gain, and this part of gain allows the terminal a to use a shorter spreading code word for data transmission on the second sub-transmission resource, thereby improving the spectrum efficiency of the system.
A terminal a that needs to send uplink data randomly selects a spreading code word a from the first spreading code word set, selects a set of spreading code word subsets (e.g. predefined mapping tables) from the second spreading code word set according to the spreading code word a, where the spreading code word subsets include X spreading code words, the second communication node sends the spreading code words a on the first sub-sending resource to allow the base station to perform channel estimation, and sends Y-bit data to be transmitted on the second sub-sending resource after spreading by the spreading code words in the spreading code word subsets, where X is an integer greater than or equal to 1 and Y is an integer greater than or equal to 16, where the Y-bit data at least includes identification information of the terminal a, which is because the first shared sending resource is shared by the terminal a and other terminals, the terminal with the data transmission requirement transmits data on the first shared transmission resource, so the base station does not know which terminal is transmitting data, and therefore the base station must carry identification information.
The base station receives a spread spectrum code word A sent by a terminal A from the first sub-sending resource, obtains channel information of the second communication node and the first communication node through the spread spectrum code word A, obtains a spread spectrum code word subset used by the terminal A on the second sub-sending resource through the spread spectrum code word A, and decodes the Y-bit data sent by the terminal A on the second sub-sending resource by using the channel information and the spread spectrum code word subset.
Example 3
The base station allocates a first shared transmission resource to the terminal a, and preferably, the base station receives data on the first shared transmission resource by using T receiving antennas, where T is a power of S of 2, and S is an integer greater than or equal to 6.
As shown in fig. 2, the first shared transmission resource is divided into two parts in time, namely a first sub-transmission resource and a second sub-transmission resource, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, the length L1 of the spreading code words in the first set of spreading code words is larger than the length L2 of the spreading code words in the second set of spreading code words, the spreading code words in the first set of spreading code words are orthogonal (for example, walsh codes), the spreading code words in the second set of spreading code words are quasi-orthogonal (for example, pseudo random number codes), and the design is to ensure that the base station can obtain the channel information of terminal a as accurately as possible, based on the information, the base station distinguishes the terminals in the space domain by using at least 256 configured receiving antennas, so that data sent by different terminals on the second sub-sending resource can be allowed to be quasi-orthogonal, and the utilization efficiency of the resource is improved.
A terminal a that needs to send uplink data randomly selects a spreading codeword a from the first spreading codeword set, and selects a set of spreading codeword subsets (e.g., predefined mapping tables) from the second spreading codeword set according to the spreading codeword a, where the spreading codeword subsets include X spreading codewords. Preferably, the first set of spreading code words includes two sets of sub-spreading code words, referred to as a first set of sub-spreading code words and a second set of sub-spreading code words, the intersection of the two sets is empty, if the spreading code word a belongs to the first set of sub-spreading code words, X is equal to 1, and if the spreading code word a belongs to the second set of sub-spreading code words, X is equal to 2. The second communication node transmits a spreading code word a on the first sub-transmission resource to allow the base station to perform channel estimation, and transmits Y-bit data to be transmitted on the second sub-transmission resource after spreading through spreading codes in the spreading code word subset, wherein X is an integer greater than or equal to 1 and Y is an integer greater than or equal to 16, wherein the Y-bit data at least includes identification information of the terminal a.
The base station receives a spread spectrum code word A sent by a terminal A from the first sub-sending resource, obtains channel information of the second communication node and the first communication node through the spread spectrum code word A, obtains a spread spectrum code word subset used by the terminal A on the second sub-sending resource through the spread spectrum code word A, and decodes the Y-bit data sent by the terminal A on the second sub-sending resource by using the channel information and the spread spectrum code word subset.
Example 4
The base station allocates a first shared transmission resource to the terminal a, and preferably, the base station receives data on the first shared transmission resource by using T receiving antennas, where T is a power of S of 2, and S is an integer greater than or equal to 6.
As shown in fig. 2, the first shared transmission resource is divided into two parts in time, namely a first sub-transmission resource and a second sub-transmission resource, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, the length L1 of the spreading code words in the first set of spreading code words is larger than the length L2 of the spreading code words in the second set of spreading code words, the spreading code words in the first set of spreading code words are orthogonal (for example, walsh codes), the spreading code words in the second set of spreading code words are quasi-orthogonal (for example, pseudo random number codes), and the design is to ensure that the base station can obtain the channel information of terminal a as accurately as possible, based on the information, the base station distinguishes the terminals in the space domain by using at least 256 configured receiving antennas, so that data sent by different terminals on the second sub-sending resource can be allowed to be quasi-orthogonal, and the utilization efficiency of the resource is improved.
A terminal a that needs to send uplink data randomly selects a spreading code word a from the first spreading code word set, selects a set of spreading code word subsets (e.g. predefined mapping tables) from the second spreading code word set according to the spreading code word a, where the spreading code word subsets include X spreading code words, the second communication node sends the spreading code words a on the first sub-sending resource to allow the base station to perform channel estimation, and sends Y-bit data to be transmitted on the second sub-sending resource after spreading by the spreading code words in the spreading code word subsets, where X is an integer greater than or equal to 1 and Y is an integer greater than or equal to 16, where the Y-bit data at least includes identification information of the terminal a, which is because the first shared sending resource is shared by the terminal a and other terminals, the terminal with the data transmission requirement transmits data on the first shared transmission resource, so the base station does not know which terminal is transmitting data, and therefore the base station must carry identification information.
Preferably, the terminal a uses the maximum transmission power to transmit the spreading code word a on the first sub-transmission resource, and randomly selects a power value within a power value range notified by the base station through signaling to transmit the Y-bit data on the second sub-transmission resource, which has the advantages that the accuracy of channel estimation is ensured by sufficiently high power to improve the spatial resolution of a channel estimation result, and the power fluctuation condition exists when the base station side receives data transmitted by different terminals is ensured by randomly selecting power on the second sub-transmission resource, so that the parallel interference cancellation receiver is better utilized to receive data, and the power value range is determined by the base station according to its own receiving capability. Or, preferably, the terminal a randomly selects a power value within a power value range notified by the base station through signaling to transmit the spreading code word a on the first sub-transmission resource and transmit the Y-bit data on the second sub-transmission resource, which has the advantages of causing power fluctuation on the base station side and saving the transmission power of the terminal.
The base station receives a spread spectrum code word A sent by a terminal A from the first sub-sending resource, obtains channel information of the second communication node and the first communication node through the spread spectrum code word A, obtains a spread spectrum code word subset used by the terminal A on the second sub-sending resource through the spread spectrum code word A, and decodes the Y-bit data sent by the terminal A on the second sub-sending resource by using the channel information and the spread spectrum code word subset.
Example 5
The base station allocates a first shared transmission resource to the terminal a, and preferably, the base station receives data on the first shared transmission resource by using T receiving antennas, where T is a power of S of 2, and S is an integer greater than or equal to 6.
As shown in fig. 2, the first shared transmission resource is divided into two parts in time, namely a first sub-transmission resource and a second sub-transmission resource, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, the length L1 of the spreading code words in the first set of spreading code words is larger than the length L2 of the spreading code words in the second set of spreading code words, the spreading code words in the first set of spreading code words are orthogonal (for example, walsh codes), the spreading code words in the second set of spreading code words are quasi-orthogonal (for example, pseudo random number codes), and the design is to ensure that the base station can obtain the channel information of terminal a as accurately as possible, based on the information, the base station distinguishes the terminals in the space domain by using at least 256 configured receiving antennas, so that data sent by different terminals on the second sub-sending resource can be allowed to be quasi-orthogonal, and the utilization efficiency of the resource is improved.
A terminal a that needs to send uplink data randomly selects a spreading code word a from the first spreading code word set, selects a set of spreading code word subsets (e.g. predefined mapping tables) from the second spreading code word set according to the spreading code word a, where the spreading code word subsets include X spreading code words, the second communication node sends the spreading code words a on the first sub-sending resource to allow the base station to perform channel estimation, and sends Y-bit data to be transmitted on the second sub-sending resource after spreading by the spreading code words in the spreading code word subsets, where X is an integer greater than or equal to 1 and Y is an integer greater than or equal to 16, where the Y-bit data at least includes identification information of the terminal a, which is because the first shared sending resource is shared by the terminal a and other terminals, the terminal with the data transmission requirement transmits data on the first shared transmission resource, so the base station does not know which terminal is transmitting data, and therefore the base station must carry identification information.
The base station receives a spread spectrum code word A sent by a terminal A from the first sub-sending resource, channel information of the second communication node and the first communication node is obtained through the spread spectrum code word A, a spread spectrum code word subset used by the terminal A on the second sub-sending resource is obtained through the spread spectrum code word A, the base station decodes the Y-bit data sent by the terminal A on the second sub-sending resource by using the channel information and the spread spectrum code word subset, if the reception is successful, the base station sends ACK information to the terminal A, if the reception is failed, the base station does not know that the terminal A sends uplink data to the base station, and the base station does not need to send any response information to the terminal A.
If the terminal a does not receive the successful reception information sent by the base station for Z times when sending the Y-bit data on the first shared resource, the terminal a stops sending data on the first shared resource, and sends the Y-bit data and the location information of the terminal a on a second shared sending resource (as shown in fig. 3) allocated by the base station, where the second shared sending resource is larger than the first shared sending resource, the configuration period of the second shared sending resource is Z times that of the first shared sending resource, Z is an integer larger than or equal to 4, preferably, the spectral efficiency of the modulation and coding scheme used by the terminal a on the second shared sending resource is lower than the spectral efficiency of the modulation and coding scheme used by the second communication node on the first shared sending resource, for example, the QPSK scheme is used on the first shared sending resource, and using the BPSK mode on the second shared transmission resource. The advantage of this is that the problem caused by reducing the system control overhead is that the base station does not know whether the terminal has sent uplink data to itself, and if the terminal has sent uplink data to the base station for many times and cannot respond, a mechanism needs to be introduced to make the base station recognize that the terminal has a transmission problem, and then further recovery measures are taken.
Example 6
The base station allocates a first shared transmission resource to the terminal a, and preferably, the base station receives data on the first shared transmission resource by using T receiving antennas, where T is a power of S of 2, and S is an integer greater than or equal to 6.
As shown in fig. 2, the first shared transmission resource is divided into two parts in time, namely a first sub-transmission resource and a second sub-transmission resource, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, the length L1 of the spreading code words in the first set of spreading code words is larger than the length L2 of the spreading code words in the second set of spreading code words, the spreading code words in the first set of spreading code words are orthogonal (for example, walsh codes), the spreading code words in the second set of spreading code words are quasi-orthogonal (for example, pseudo random number codes), and the design is to ensure that the base station can obtain the channel information of terminal a as accurately as possible, based on the information, the base station distinguishes the terminals in the space domain by using at least 256 configured receiving antennas, so that data sent by different terminals on the second sub-sending resource can be allowed to be quasi-orthogonal, and the utilization efficiency of the resource is improved.
A terminal a that needs to send uplink data randomly selects a spreading code word a from the first spreading code word set, selects a set of spreading code word subsets (e.g. predefined mapping tables) from the second spreading code word set according to the spreading code word a, where the spreading code word subsets include X spreading code words, the second communication node sends the spreading code words a on the first sub-sending resource to allow the base station to perform channel estimation, and sends Y-bit data to be transmitted on the second sub-sending resource after spreading by the spreading code words in the spreading code word subsets, where X is an integer greater than or equal to 1 and Y is an integer greater than or equal to 16, where the Y-bit data at least includes identification information of the terminal a, which is because the first shared sending resource is shared by the terminal a and other terminals, the terminal with the data transmission requirement transmits data on the first shared transmission resource, so the base station does not know which terminal is transmitting data, and therefore the base station must carry identification information.
The base station receives a spread spectrum code word A sent by a terminal A from the first sub-sending resource, channel information of the second communication node and the first communication node is obtained through the spread spectrum code word A, a spread spectrum code word subset used by the terminal A on the second sub-sending resource is obtained through the spread spectrum code word A, the base station decodes the Y-bit data sent by the terminal A on the second sub-sending resource by using the channel information and the spread spectrum code word subset, if the reception is successful, the base station sends ACK information to the terminal A, if the reception is failed, the base station does not know that the terminal A sends uplink data to the base station, and the base station does not need to send any response information to the terminal A.
If the terminal a does not receive the successful reception information sent by the base station for Z times when sending the Y-bit data on the first shared resource, the terminal a stops sending data on the first shared resource, and sends the Y-bit data and the location information of the terminal a on a second shared sending resource (as shown in fig. 3) allocated by the base station, where the second shared sending resource is larger than the first shared sending resource, the configuration period of the second shared sending resource is Z times that of the first shared sending resource, Z is an integer larger than or equal to 4, and preferably, the base station receives data on the second shared sending resource by using P x T receiving antennas, where P is an integer larger than or equal to 2, which has the advantage of reducing system control overhead in that the base station does not know whether the terminal sends uplink data to itself, if the terminal sends uplink data to the base station for multiple times and cannot obtain a response, a mechanism with higher reliability needs to be introduced to make the base station realize that the terminal has a transmission problem, for example, the number of receiving antennas is increased, although the power consumption of the base station is increased, the probability of successful receiving can be improved, and then further recovery measures are taken.
Example 7
The base station allocates a first shared transmission resource to the terminal a, and preferably, the base station receives data on the first shared transmission resource by using T receiving antennas, where T is a power of S of 2, and S is an integer greater than or equal to 6.
As shown in fig. 2, the first shared transmission resource is divided into two parts in time, namely a first sub-transmission resource and a second sub-transmission resource, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, the length L1 of the spreading code words in the first set of spreading code words is larger than the length L2 of the spreading code words in the second set of spreading code words, the spreading code words in the first set of spreading code words are orthogonal (for example, walsh codes), the spreading code words in the second set of spreading code words are quasi-orthogonal (for example, pseudo random number codes), and the design is to ensure that the base station can obtain the channel information of terminal a as accurately as possible, based on the information, the base station distinguishes the terminals in the space domain by using at least 256 configured receiving antennas, so that data sent by different terminals on the second sub-sending resource can be allowed to be quasi-orthogonal, and the utilization efficiency of the resource is improved.
A terminal a that needs to send uplink data randomly selects a spreading code word a from the first spreading code word set, selects a set of spreading code word subsets (e.g. predefined mapping tables) from the second spreading code word set according to the spreading code word a, where the spreading code word subsets include X spreading code words, the second communication node sends the spreading code words a on the first sub-sending resource to allow the base station to perform channel estimation, and sends Y-bit data to be transmitted on the second sub-sending resource after spreading by the spreading code words in the spreading code word subsets, where X is an integer greater than or equal to 1 and Y is an integer greater than or equal to 16, where the Y-bit data at least includes identification information of the terminal a, which is because the first shared sending resource is shared by the terminal a and other terminals, the terminal with the data transmission requirement transmits data on the first shared transmission resource, so the base station does not know which terminal is transmitting data, and therefore the base station must carry identification information.
The base station receives a spread spectrum code word A sent by a terminal A from the first sub-sending resource, channel information of the second communication node and the first communication node is obtained through the spread spectrum code word A, a spread spectrum code word subset used by the terminal A on the second sub-sending resource is obtained through the spread spectrum code word A, the base station decodes the Y-bit data sent by the terminal A on the second sub-sending resource by using the channel information and the spread spectrum code word subset, if the reception is successful, the base station sends ACK information to the terminal A, if the reception is failed, the base station does not know that the terminal A sends uplink data to the base station, and the base station does not need to send any response information to the terminal A.
If the terminal a does not receive the successful reception information sent by the base station for Z times when sending the Y-bit data on the first shared resource, the terminal a stops sending the data on the first shared resource, and sends the Y-bit data and the position information of the terminal a on a second shared sending resource (as shown in fig. 3) allocated by the base station, where the second shared sending resource is greater than the first shared sending resource, a configuration period of the second shared sending resource is Z times that of the first shared sending resource, and Z is an integer greater than or equal to 4.
If the base station successfully decodes the Y-bit data and the position information of the terminal on the second shared sending resource, the base station determines whether a small base station which is not in a working state exists in a range with a physical distance of less than 50 meters from the terminal A according to the position information of the terminal A, if so, the base station informs the small base station to switch to the working state through signaling and requires the terminal A to switch to the small base station, wherein the small base station and the base station can carry out bidirectional data communication with the frequency spectrum efficiency of not less than 8 bit/Hz.
The experimental result shows that the method can effectively reduce the control signaling overhead required in machine communication and avoid the signaling storm problem under the condition of meeting the data transmission requirement.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A data transmission method with low control overhead is characterized in that: the method comprises the following steps:
1) a first communication node allocates a first shared transmission resource to a second communication node, the first shared transmission resource is shared by the second communication node and other second communication nodes, the first shared transmission resource is divided into two parts, namely a first sub-transmission resource and a second sub-transmission resource, in time, the time domain length of the first sub-transmission resource is smaller than that of the second sub-transmission resource, the set of spreading code words allowed to be used on the first sub-transmission resource is a first set of spreading code words, the set of spreading code words allowed to be used on the second sub-transmission resource is a second set of spreading code words, and the length L1 of a spreading code word in the first set of spreading code words is greater than that in the second set of spreading code wordsA spreading code word length L2, wherein spreading codes in the first spreading code word set are orthogonal to each other, spreading codes in the second spreading code word set are quasi-orthogonal to each other, and the first communication node receives data on the first shared transmission resource using T receiving antennas, where T is 2SS is an integer greater than or equal to 6;
2) the second communication node randomly selects a spreading code word a from the first spreading code word set, selects a group of spreading code word subsets from the second spreading code word set according to the spreading code word a, where the spreading code word subsets include X spreading code words, the second communication node transmits the spreading code words a on the first sub-transmission resource, and transmits Y-bit data to be transmitted on the second sub-transmission resource after spreading the Y-bit data by using the spreading code words in the spreading code word subsets, where X is an integer greater than or equal to 1, Y is an integer greater than or equal to 16, and the Y-bit data at least includes identification information of the second communication node;
3) the first communication node receives a spread spectrum code word a sent by the second communication node from the first sub-sending resource, obtains channel information of the second communication node and the first communication node through the spread spectrum code word a, and obtains a spread spectrum code word subset used by the second communication node on the second sub-sending resource through the spread spectrum code word a, and the first communication node decodes the Y-bit data sent by the second communication node on the second sub-sending resource by using the channel information and the spread spectrum code word subset.
2. The data transmission method according to claim 1, characterized in that: the spreading codeword length L2 is equal to max (1024/T, 1); when L2 takes a value of 1, the second set of spreading codes only includes a code word sequence taking a value of 1.
3. The data transmission method according to claim 1, characterized in that: the first spreading code word set comprises two sub-spreading code word sets, which are called a first sub-spreading code word set and a second sub-spreading code word set, and the intersection of the two sets is empty, if the spreading code word a belongs to the first sub-spreading code word set, X is equal to 1, and if the spreading code word a belongs to the second sub-spreading code word set, X is equal to 2.
4. The data transmission method according to claim 3, characterized in that: selecting the spreading code word a from the first set of sub-spreading code words if the second communication node sends a first-pass data packet, and selecting the spreading code word a from the second set of sub-spreading code words if the second communication node sends a retransmission data packet.
5. The data transmission method according to claim 1, characterized in that: and the second communication node uses the maximum transmission power to send the spread spectrum code word A on the first sub-sending resource, and randomly selects a power value in a power value range notified by the first communication node through signaling to send the Y-bit data on the second sub-sending resource.
6. The data transmission method according to claim 1, characterized in that: and the second communication node randomly selects a power value within a power value range notified by the first communication node through signaling to transmit the spread spectrum code word A on the first sub-transmission resource and transmit the Y-bit data on the second sub-transmission resource.
7. The data transmission method according to claim 1, characterized in that: the first shared resource is periodically allocated, if the second communication node does not receive the successful reception information sent by the first communication node when sending the Y-bit data for Z times on the first shared resource, the second communication node stops sending the data on the first shared resource, and sends the Y-bit data and the location information of the second communication node on a second shared sending resource allocated by the first communication node, where the second shared sending resource is larger than the first shared sending resource, a configuration period of the second shared sending resource is Z times of the first shared sending resource, and Z is an integer greater than or equal to 4.
8. The data transmission method according to claim 7, characterized in that: the spectral efficiency of the modulation and coding scheme used by the second communication node on the second shared transmission resource is lower than the spectral efficiency of the modulation and coding scheme used by the second communication node on the first shared transmission resource.
9. The data transmission method according to claim 7, characterized in that: if the first communication node successfully decodes the Y-bit data of the second communication node on the second shared transmission resource and the position information of the second communication node, the first communication node determines whether a third communication node which is not in a working state exists in a range with a physical distance of less than 50 meters from the second communication node according to the position information of the second communication node, if so, the first communication node informs the third communication node of being in the working state through signaling and requires the second communication node to be switched to the third communication node, wherein the third communication node and the first communication node can carry out bidirectional data communication with the spectral efficiency not lower than 8 bit/Hz.
10. The data transmission method according to claim 7, characterized in that: and the first communication node receives data on the second shared transmission resource by using P T receiving antennas, wherein P is an integer greater than or equal to 2.
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| CN109547173B (en) * | 2018-12-21 | 2021-04-09 | 深圳职业技术学院 | Information transmission method in Internet of things |
| CN109660943B (en) * | 2019-01-16 | 2020-10-16 | 深圳职业技术学院 | Self-adaptive Internet of things data transmission method |
| CN110048812B (en) * | 2019-03-29 | 2020-12-01 | 深圳职业技术学院 | Data transmission method, system and storage medium based on transmitting power in Internet of things |
| CN110048810B (en) * | 2019-03-29 | 2021-01-05 | 深圳职业技术学院 | Information sending method, system and storage medium in Internet of things |
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