CN106658729B - Flexible transmission method - Google Patents
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- CN106658729B CN106658729B CN201611145366.3A CN201611145366A CN106658729B CN 106658729 B CN106658729 B CN 106658729B CN 201611145366 A CN201611145366 A CN 201611145366A CN 106658729 B CN106658729 B CN 106658729B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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Abstract
The invention provides a flexible data transmission method, which comprises that a first node distributes a first shared sending resource which is divided into a first sub sending resource and a second sub sending resource in time for a second node; the second node randomly selects a spread spectrum code word A in the first spread spectrum code word set, and selects a group of spread spectrum code word subset 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 the Y-bit data to be transmitted after spreading on the second sub-sending resource by adopting the spreading code; the first node decodes the Y-bit data using the channel information and the subset of spreading codes; if the second node does not receive the ACK after sending the ACK for Z times on the first shared resource, the second node sends a link abnormal spread spectrum code word on the link abnormal information resource; and the first node measures the energy value of the received link abnormal spread spectrum code word and carries out subsequent operation according to the energy value. 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 overcome the problems of large-scale machine communication data transmission control overhead and the like in a fifth generation wireless communication system and provides a flexible data transmission method.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a flexible data transmission method comprising the steps of: 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 of 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, and the first sub-transmission resource is smaller than that of the second sub-transmission resourceThe set of spreading code words allowed to be used 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 greater 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, 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 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; 4) if the second communication node does not receive successful receiving information sent by the first communication node when the second communication node sends the Y-bit data on the first shared resource for Z times, the second communication node sends a link abnormal spread spectrum code word on a link abnormal information sending resource distributed by the first communication node, wherein Z is an integer greater than or equal to 4; 5) the first communication node measures receptionAnd performing subsequent operation according to the energy value of the abnormal spread spectrum code word of the link.
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 second communication node randomly selects a value within an interval (0.5, 1) to multiply the path loss between the second communication node and the first communication node, so as to obtain a transformed path loss value, uses the transformed path loss value as a path loss value used by the second communication node for transmitting power, and then transmits the spreading code word a on the first sub-transmission resource and the Y-bit data on the second sub-transmission resource by using the calculated power value.
Further, if the energy value is greater than 100dB, the first communication node sends two sets of power selection sets, which are respectively referred to as a normal power set and an enhanced power set, and if the second communication node sends a link abnormal spreading code word, the second communication node subsequently selects a transmission power value from the enhanced power set to continue sending data from the first shared transmission resource, and if the second communication node does not send a link abnormal spreading code word, the second communication node selects a transmission power value from the normal power set to continue sending data from the first shared transmission resource.
Further, the power value in the enhanced power set is greater than the power value in the normal power set.
Further, if the energy value is greater than 100dB, the first communication node uses a second shared transmission resource, if the second communication node has transmitted a link-abnormal spreading code word, the second communication node stops using the first shared transmission resource, transmits data using the second shared transmission resource, and if the second communication node has not transmitted a link-abnormal spreading code word, the second communication node transmits data using the first shared transmission resource.
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; the first node receives the spread spectrum code word A, channel information of the second node and the first node is obtained through the spread spectrum code word A, a spread spectrum code word subset used on the second sub-sending resource is obtained through the spread spectrum code word A, and the first node decodes the Y-bit data by using the channel information and the spread spectrum code word subset; if the second node does not receive the ACK after sending the ACK for Z times on the first shared resource, the second node sends a link abnormal spread spectrum code word on a link abnormal information sending resource distributed by the first node; the first node measures the energy value of the received abnormal spread spectrum code word of the link, and carries out subsequent operation according to the energy value, 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 diagram of a first 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 the data using T receiving antennasData on the first shared transmission resource, T-2SAnd S is an integer of 6 or more.
And step 110, the first communication node measures the energy value of the received link abnormal spread spectrum code word, and performs subsequent operation according to the energy value.
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.
And if the Y-bit data sent by the base station for Z times on the first shared resource is not received by the terminal A, the terminal A sends a link abnormal spread spectrum code word on a link abnormal information sending resource allocated by the base station, wherein Z is an integer greater than or equal to 4. Preferably, a plurality of terminals with link abnormality can send the same link abnormality spreading code word, which has the advantage of making the base station know that some terminals have link abnormality as soon as possible, although it is not known which terminals have abnormality, so as to help the base station to take recovery measures as soon as possible.
The base station measures the energy value of the received abnormal spread spectrum code word of the link, if the energy value is greater than 100dB, the base station sends two sets of power selection sets which are respectively called a normal power set and a strengthened power set, if the terminal A sends the abnormal spread spectrum code word of the link, the terminal A subsequently selects a transmission power value from the strengthened power set to continuously send data from the first shared sending resource, and if the terminal A does not send the abnormal spread spectrum code word of the link, the terminal A selects the transmission power value from the normal power set to continuously send data from the first shared sending resource. Preferably, the power value in the enhanced power set is greater than the power value in the normal power set, which brings about the advantages of increasing the power of the terminal with abnormal link, improving the service quality of the terminal, and having little influence on the terminal with better link quality.
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.
And if the Y-bit data sent by the base station for Z times on the first shared resource is not received by the terminal A, the terminal A sends a link abnormal spread spectrum code word on a link abnormal information sending resource allocated by the base station, wherein Z is an integer greater than or equal to 4. Preferably, a plurality of terminals with link abnormality can send the same link abnormality spreading code word, which has the advantage of making the base station know that some terminals have link abnormality as soon as possible, although it is not known which terminals have abnormality, so as to help the base station to take recovery measures as soon as possible.
The base station measures the energy value of the received abnormal spread spectrum code word of the link, if the energy value is larger than 100dB, the base station sends two sets of power selection sets which are respectively called a normal power set and a strengthened power set, if the terminal A sends the abnormal spread spectrum code word of the link, the terminal A selects a transmission power value from the strengthened power set and sends data from the first shared sending resource, and if the terminal A does not send the abnormal spread spectrum code word of the link, the terminal A selects the transmission power value from the normal power set and sends data from the first shared sending resource. Preferably, the power value in the enhanced power set is greater than the power value in the normal power set, which brings about the advantages of increasing the power of the terminal with abnormal link, improving the service quality of the terminal, and having little influence on the terminal with better link quality.
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.
And if the Y-bit data sent by the base station for Z times on the first shared resource is not received by the terminal A, the terminal A sends a link abnormal spread spectrum code word on a link abnormal information sending resource allocated by the base station, wherein Z is an integer greater than or equal to 4. Preferably, a plurality of terminals with link abnormality can send the same link abnormality spreading code word, which has the advantage of making the base station know that some terminals have link abnormality as soon as possible, although it is not known which terminals have abnormality, so as to help the base station to take recovery measures as soon as possible.
The base station measures the energy value of the received abnormal spread spectrum code word of the link, if the energy value is larger than 100dB, the base station sends two sets of power selection sets which are respectively called a normal power set and a strengthened power set, if the terminal A sends the abnormal spread spectrum code word of the link, the terminal A selects a transmission power value from the strengthened power set and sends data from the first shared sending resource, and if the terminal A does not send the abnormal spread spectrum code word of the link, the terminal A selects the transmission power value from the normal power set and sends data from the first shared sending resource. Preferably, the power value in the enhanced power set is greater than the power value in the normal power set, which brings about the advantages of increasing the power of the terminal with abnormal link, improving the service quality of the terminal, and having little influence on the terminal with better link quality.
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. Or, preferably, the terminal a randomly selects a value within an interval (0.5, 1) to multiply the path loss between the terminal a and the base station, so as to obtain a transformed path loss value, uses the transformed path loss value as the path loss value used by the second communication node for transmitting power, and then transmits the spreading code word a on the first sub-transmission resource and the Y-bit data on the second sub-transmission resource by using the calculated power value (for example, by using the path loss calculation formula of LTE).
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.
And if the Y-bit data sent by the base station for Z times on the first shared resource is not received by the terminal A, the terminal A sends a link abnormal spread spectrum code word on a link abnormal information sending resource allocated by the base station, wherein Z is an integer greater than or equal to 4. Preferably, a plurality of terminals with link abnormality can send the same link abnormality spreading code word, which has the advantage of making the base station know that some terminals have link abnormality as soon as possible, although it is not known which terminals have abnormality, so as to help the base station to take recovery measures as soon as possible.
The base station measures the energy value of the received abnormal spread spectrum code word of the link, if the energy value is larger than 100dB, the base station sends two sets of power selection sets which are respectively called a normal power set and a strengthened power set, if the terminal A sends the abnormal spread spectrum code word of the link, the terminal A selects a transmission power value from the strengthened power set and sends data from the first shared sending resource, and if the terminal A does not send the abnormal spread spectrum code word of the link, the terminal A selects the transmission power value from the normal power set and sends data from the first shared sending resource. Preferably, the power value in the enhanced power set is greater than the power value in the normal power set, which brings about the advantages of increasing the power of the terminal with abnormal link, improving the service quality of the terminal, and having little influence on the terminal with better link quality.
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, 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.
And if the Y-bit data sent by the base station for Z times on the first shared resource is not received by the terminal A, the terminal A sends a link abnormal spread spectrum code word on a link abnormal information sending resource allocated by the base station, wherein Z is an integer greater than or equal to 4. Preferably, a plurality of terminals with link abnormality can send the same link abnormality spreading code word, which has the advantage of making the base station know that some terminals have link abnormality as soon as possible, although it is not known which terminals have abnormality, so as to help the base station to take recovery measures as soon as possible.
If the energy value measured by the base station is greater than 100dB, the base station sends a second shared sending resource, if the terminal A sends a code word with abnormal link spreading, the terminal A stops using the first shared sending resource, the second shared sending resource is used for sending data, and if the terminal A does not send the code word with abnormal link spreading, the terminal A uses the first shared sending resource for sending data.
The experimental result shows that the method of the invention 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 flexible data transmission method, characterized by: the method 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 of 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, 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 communications node receives data on the first shared transmission resource using T receive antennas, T2SS 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;
4) if the second communication node does not receive successful receiving information sent by the first communication node when the second communication node sends the Y-bit data on the first shared sending resource for Z times, the second communication node sends a link abnormal spread spectrum code word on a link abnormal information sending resource distributed by the first communication node, wherein Z is an integer greater than or equal to 4;
5) and the first communication node measures the received energy value of the abnormal link spread spectrum code word and carries out subsequent operation according to the energy value.
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: and the second communication node randomly selects a value in an interval (0.5, 1) to be multiplied by the path loss between the second communication node and the first communication node to obtain a converted path loss value, the converted path loss value is used as the path loss value used by the second communication node for transmitting power, and then the spread spectrum code word A is transmitted on the first sub-transmission resource and the Y-bit data is transmitted on the second sub-transmission resource by using the calculated power value.
8. The data transmission method according to claim 1, characterized in that: if the energy value is greater than 100dB, the first communication node sends two sets of power selection sets which are respectively called a normal power set and an enhanced power set; if the second communication node sends a link abnormal spread spectrum code word, the second communication node subsequently selects a transmission power value from the intensified power set to continuously send data from the first shared sending resource; if the second communication node has not sent a link-abnormal spreading code word, the second communication node selects a transmit power value from a normal power set to continue sending data from the first shared transmission resource.
9. The data transmission method according to claim 8, wherein: the power value in the enhanced power set is greater than the power value in the normal power set.
10. The data transmission method according to claim 1, characterized in that: if the energy value is greater than 100dB, the first communication node uses a second shared transmission resource, if the second communication node sends a link abnormal spreading code word, the second communication node stops using the first shared transmission resource, the second shared transmission resource is used for transmitting data, and if the second communication node does not send the link abnormal spreading code word, the second communication node uses the first shared transmission resource for transmitting data.
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| CN108200556B (en) * | 2018-01-16 | 2019-05-21 | 深圳职业技术学院 | A kind of highly reliable business transmitting method |
| CN109639400B (en) * | 2018-12-21 | 2021-04-09 | 深圳职业技术学院 | Method for sending combined data in Internet of things |
| CN109413621B (en) * | 2018-12-21 | 2021-06-22 | 深圳职业技术学院 | Method for sending combined data in Internet of things |
| CN109617665B (en) * | 2019-01-16 | 2021-05-11 | 深圳职业技术学院 | Grading data transmission method in narrow-band Internet of things |
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