CN106936556A - A kind of time-frequency two-dimensional Sparse Code multiple access method towards arrowband Internet of Things - Google Patents
A kind of time-frequency two-dimensional Sparse Code multiple access method towards arrowband Internet of Things Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
- H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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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
Abstract
The invention provides a kind of time-frequency two-dimensional Sparse Code multiple access method towards arrowband Internet of Things,It is related to communication technical field,Time slot is divided on arrowband,N number of running time-frequency resource unit is constituted into a SCMA time/frequency source block,Moved using honeycomb or wireless lan communication system indicates SCMA time/frequency source blocks for uplink scheduling,It is up to exempt from scheduling,Up mixed scheduling and descending,SCMA is only turned into time-frequency two-dimensional work in frequency domain work change,The present invention is by the Sparse Code non-orthogonal multiple using time-frequency two-dimensional,SCMA technologies are expanded into time-frequency two-dimensional work from frequency domain,Both the narrow-band characteristic of IoT equipment had been ensure that,Mobile communication subscriber connection number is improved again,The availability of frequency spectrum and network capacity,Compared to currently available technology,In the case of identical bit error rate,Improve 1.5 times of number of users and 1.5 times of network throughput,Significantly lift performance of mobile communication system.
Description
Technical field
The present invention relates to communication technical field, especially a kind of multiple access method.
Background technology
Internet of Things (Internet of Things, IoT) is the important component of the communication technology of new generation, refers to thing thing phase
Internet even, is the inexorable trend of wireless and mobile network development.
The core of Internet of Things and basis are internets, and it is the network for extending and extending on Internet basic, and by
In the mobility feature of its equipment, therefore it needs the support of conventional wireless network.Cost, province's energy yet with IoT equipment
The limitation of the portfolio of demand and individual equipment single transmission, IoT equipment has an arrowband feature, and traditional cellular network
(3G and 4G) and WLAN (IEEE 802.1x) have the broadband feature of two-forty, cause the arrowband of IoT equipment
And conventional wireless network it is broadband between contradiction.
In order to solve this contradiction, wireless network has showed using arrowband to support the trend of IoT in recent years, i.e., narrow
Band Internet of Things.Cellular Networks 3GPP (The 3rd Generation Partnership Project) was completed in 2016
The formulation work of NB-IoT (Narrow Band Internet of Things, NB-IoT) standard, WLAN into
Vertical LRLP (Long Range Low Power) working groups and WUR (Wake-Up Receiver) working group, focus on arrowband
IoT。
At this stage because the quantity of IoT equipment is sharply increased, it is desirable to arrowband IoT keep its narrow-band feature on the basis of,
It is obviously improved number of users and total capacity.The sparse CDMA that 5G intends using accesses SCMA (Sparse Code Multiple
Access be) new non-orthogonal multiple technology, be obviously improved on the premise of bandwidth is constant user connection number, network capacity and
The availability of frequency spectrum, but due to the broadband characteristic of 5G, so the SCMA used in 5G needs user equipment (User
Equipment, UE) possess the ability of multiple channels/subcarrier transmitting-receiving, this with current arrowband IoT equipment costs, save can and it is narrow
Bandization demand contradictory.
In sum, a kind of multiple access method that non-orthogonal multiple advantage is obtained on the basis of arrowband IoT is lacked at present.
The content of the invention
In order to overcome the deficiencies in the prior art, non-orthogonal multiple cut-in method is applied to arrowband IoT, so as to lift user
Connection number, spectrum efficiency and network capacity, it is many that the present invention proposes a kind of time-frequency two-dimensional Sparse Code towards arrowband Internet of Things
Location cut-in method, by former SCMA only frequency domain work change turn to time-frequency two-dimensional work, i.e., SCMA Resource Block from N number of channel/
Subchannel/sub-carrier variations are N number of time slot or N number of running time-frequency resource unit (Resource Block, RB), so that communication system
Performance advantage of both can obtaining simultaneously：On the one hand, the original narrow-band characteristic of IoT equipment is kept, cost is met and is saved energy
Demand；On the other hand, user's connection number, the availability of frequency spectrum and network capacity are improved.
The step of the technical solution adopted for the present invention to solve the technical problems, is as follows：
Step 1：System is divided into time slot on arrowband
Honeycomb is moved or wireless lan communication system is divided into time slot (Slot) on arrowband, goes to step 2, specific work
Make mode and be divided into the following two kinds according to the difference of access way：
Mode 1：System is divided into time slot, and all communication nodes align in time, and node is respectively in different time slots
Upper access channel；
Mode 2：Under the pattern of contention access, now node time need not align system operation, using random competition
Mode accesses channel, the laggard input time slot pattern of trigger frame is sent in base station, in base station by descending after all node time alignment
Channel is accessed on the ready-portioned time slot of signaling；
Step 2：N number of running time-frequency resource unit is constituted into a SCMA time/frequency source block, is moved using honeycomb or wireless local
Network communication system indicates the SCMA time/frequency source blocks to be used for uplink scheduling, up exempt from scheduling, up mixed scheduling and descending；
If time/frequency source block is used for uplink scheduling, 3 are gone to step；
If time/frequency source block exempts from scheduling for up, 4 are gone to step；
If time/frequency source block is used for up mixed scheduling, 5 are gone to step；
If time/frequency source block is used for indicating downlink, 6 are gone to step；
Step 3：The execution uplink scheduling accesses step, comprises the following steps that：
Step 3.1：Scheduled user equipment (UE) is according to code book by by the encoded information flow mapping after channel coding
It is N roads signal, and N roads signals s1, s2, s3..., snWith N number of running time-frequency resource unit r1, r2, r3..., rnCorrespond, at least
Two non-zero signals of UE can be mapped to same running time-frequency resource unit, be sent out one by one according to the time sequencing of running time-frequency resource unit
The number of delivering letters；
Step 3.2：Base station is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, in N
Multiuser detection is performed after the individual running time-frequency resource unit end of transmission, the multiuser detection is calculated using message transmission
Method or maximum likelihood algorithm, you can by the information separation and Extraction of user out；
Step 4：It is described perform it is up exempt from scheduling access step it is as follows：
Step 4.1：UE according to exempt from dispatch access rules：Access or access is kept out of the way according to competition with probability P and determine whether
Access, the probability P is the random number that base station is informed between 0 to 1 of user in downlink signaling, as do not accessed, is exited
It is up to exempt from scheduling access step, step 4.2 is performed if accessing；
Step 4.2：Encoded information flow is mapped as N roads signal according to code book by scheduled UE, and N roads signal with it is N number of
Running time-frequency resource unit is corresponded, and the non-zero signal of at least two UE is mapped to same running time-frequency resource unit, according to when
Frequency Resource Unit sending signal one by one；
Step 4.3：Base station is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, in N
Multiuser detection is performed after the individual running time-frequency resource unit end of transmission, the multiuser detection uses Message Passing Algorithm
Or maximum likelihood algorithm, you can by user profile separation and Extraction out；
Step 5：It is described to perform up mixed scheduling access, comprise the following steps that：
Step 5.1：Without scheduled UE according to exempting from scheduling access rules：Accessed with probability P or kept out of the way according to competition
Access determines whether to access, and up mixed scheduling is exited if not accessing and accesses step, and step 5.2 is performed if accessing；
Step 5.2：Encoded information flow is mapped as N roads by scheduled UE and the scheduling UE that exempts from of judgement access according to code book
Signal, and N roads signal corresponds with N number of running time-frequency resource unit, the non-zero signal of at least two UE is mapped to same
Running time-frequency resource unit, and according to N number of running time-frequency resource unit sending signal one by one；
Step 5.3：Base station is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, in N
Multiuser detection is performed after the individual running time-frequency resource unit end of transmission, the multiuser detection uses Message Passing Algorithm
Or maximum likelihood algorithm, you can by the information separation and Extraction of user out；
Step 6：It is described to perform descending access, comprise the following steps that：
Step 6.1：Base station is each mapped to N roads signal, and N according to code book, the encoded information flow that will be sent to multiple UE
Road signal is corresponded with N number of running time-frequency resource unit, and the non-zero signal of at least two UE is mapped to same running time-frequency resource
, then be overlapped for the signal that all UE are sent on same channel, and send letter one by one according to running time-frequency resource unit by unit
Number；
Step 6.2：The UE of data to be received is laggard in the signal that each running time-frequency resource unit receives multiple user's superpositions
Row is preserved, and multiuser detection is performed after N number of running time-frequency resource unit end of transmission, and the information separation and Extraction of UE itself is gone out
Come.
The beneficial effects of the invention are as follows by the Sparse Code non-orthogonal multiple using time-frequency two-dimensional, by SCMA technologies from frequency domain
On expand to time-frequency two-dimensional work, both ensure that the narrow-band characteristic of IoT equipment, improve again mobile communication subscriber connection number, frequency
Spectrum utilization rate and network capacity, compared to currently available technology, in the case of identical bit error rate, improve 1.5 times of use
Amount amount and 1.5 times of network throughput, significantly lift performance of mobile communication system.
Brief description of the drawings
Fig. 1 is schematic diagram of the invention, and wherein Fig. 1 (a) is time domain SCMA schematic diagrames, and Fig. 1 (b) is that time-frequency two-dimensional SCMA shows
It is intended to.
Fig. 2 is the flow chart of embodiments of the invention one.
Fig. 3 is the flow chart of embodiments of the invention two.
Fig. 4 is the flow chart of embodiments of the invention three.
Fig. 5 is the flow chart of embodiments of the invention four.
Fig. 6 is the flow chart of embodiments of the invention five.
Fig. 7 is network throughput performance map of the invention.
Wherein, STA (station) is website.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is schematic diagram of the invention, and wherein Fig. 1 (a) is time domain SCMA schematic diagrames, is to be changed into traditional frequency domain SCMA
The SCMA of time domain, mainly for single-channel system, Fig. 1 (b) is time-frequency two-dimensional SCMA schematic diagrames, mainly for multichannel system.
Embodiment one
As shown in Fig. 2 embodiment one describes the pure time domain SCMA under 5G cellular network only one of which arrowband IoT channel situations
Method, multiple time slots are divided into by arrowband IoT, and N number of time slot is constituted into a SCMA Resource Block, and UE is transmitted using this Resource Block
Data.
Step 1：Each frame of arrowband IoT is all divided into time slot, and using N number of time slot as a SCMA Resource Block, point
Used to one group of UE.
Comprise the following steps that：
Step 1.1：Each frame on arrowband IoT is divided into time slot, forth generation GSM is based in Fig. 2 examples
The frame structure of (4G) has divided 10 time slots altogether, and used as Typical Disposition, the present invention supports other flexible time slot dividing modes, by
Specific wireless network protocol is determined.
Step 1.2：N number of time slot constitutes a SCMA Resource Block, distributes to UE and uses, and in Fig. 2, Slot 0 is used to dispatch money
Source is distributed, and Slot 1-4 and Slot 5-8 are used respectively as 2 SCMA Resource Block for 2 groups of UE, and Slot 9 is used for user equipment
Feeding back uplink demand data.
Go to step 2；
Step 2：SCMA Resource Block is using any one mode in authorizing, exempting from mandate and half three kinds of modes of mandate so that UE
Channel is accessed, uplink situation specifically goes to step 3, and descending situation goes to step 4；
Step 3：UE accesses channel and concurrently send upstream data, comprises the following steps that：
Step 3.1：Encoded information flow is mapped as N roads signal according to code book by the UE of access, and N roads signal with it is N number of when
Domain Resource Unit is corresponded, and at least two non-zero signals of UE can be mapped to same time-domain resource unit, and according to
Time-domain resource unit sending signal one by one；
Step 3.2：Base station is preserved after each time-domain resource unit receives the signal of multiple user's superpositions, at this
Multiuser detection is performed after N number of time-domain resource unit end of transmission, by the information separation and Extraction of user out.
Step 4：According to the scheduling rule for using, during descending access, comprise the following steps that：
Step 4.1：Access point (Access Point, AP) will be sent to the encoded information flow point of multiple UE according to code book
N roads signal is not mapped as, and N roads signal is corresponded with N number of time-domain resource unit, at least two non-zero signals of UE can quilt
Same time-domain resource unit is mapped to, will be then overlapped per signal all the way, and sent one by one according to time-domain resource unit
Signal；
Step 4.2：The UE of data to be received is laggard in the signal that each time-domain resource unit receives multiple user's superpositions
Row is preserved, and multiuser detection is performed after N number of time-domain resource unit end of transmission, and the information separation and Extraction of user is gone out
Come.
Embodiment two
As shown in figure 3, embodiment two describes the time domain for having under multiple independent arrowband IoT channel situations in 5G cellular networks
SCMA methods, will embodiment one expand to the situation of multiple separate narrowband channels, when multiple arrowband IoT are respectively divided into multiple
Gap, and the N number of time slot on each arrowband is constituted into a SCMA Resource Block, UE makes between different narrow band channels independently of one another
Data are transmitted with Resource Block.
Step 1：The frame of each arrowband IoT is divided into time slot, and using the N number of time slot on each arrowband an as SCMA
Time/frequency source block, gives one group of UE and uses.
Comprise the following steps that：
Step 1.1：Each frame on arrowband is divided into time slot, is drawn respectively based on 2 channels of 4G frame structures in Fig. 3 examples
Divide 10 time slots as Typical Disposition, time slot dividing mode is determined by specific wireless network protocol.
Step 1.2：N number of time slot on each arrowband constitutes a SCMA Resource Block, is respectively allocated to UE and uses, in Fig. 3,
The Slot 1-4 of channel 1 are a SCMA Resource Block, give STA 1-6 and use；The Slot 1-4 of channel 2 are a SCMA resources
Block, gives STA 7-12 and uses.
Go to step 2；
Step 2：The UE for working on this channel is carried on each arrowband, SCMA Resource Block uses and authorizes, exempts from mandate and half
Authorize any one mode in three kinds of modes so that UE accesses respective narrow band channel.
Uplink situation specifically goes to step 3, and descending situation goes to step 4；
Step 3：According to the scheduling rule for using, UE is accessed and is concurrently sent upstream data, is comprised the following steps that：
Step 3.1：Encoded information flow is mapped as N roads signal, and N roads by the UE accessed on each arrowband according to code book
Signal is corresponded with N number of time-domain resource unit, and at least two non-zero signals of UE can be mapped to same time-domain resource
Unit, and according to time-domain resource unit sending signal one by one；
Step 3.2：Base station is preserved after each time-domain resource unit receives the signal of multiple user's superpositions, at this
Multiuser detection is performed after N number of time-domain resource unit end of transmission, by the information separation and Extraction of user out.
Step 4：According to the scheduling rule for using, during descending access, comprise the following steps that：
Step 4.1：The encoded information flow that multiple UE are sent on each arrowband is each mapped to N roads by AP according to code book
Signal, and N roads signal corresponds with N number of time-domain resource unit, at least two non-zero signals of UE can be mapped to same
Individual time-domain resource unit, will then be overlapped per signal all the way, and according to time-domain resource unit sending signal one by one；
Step 4.2：Each the time-domain resource unit of the UE of data to be received on the arrowband where oneself receives multiple
Preserved after the signal of user's superposition, multiuser detection is performed after N number of time-domain resource unit end of transmission, by itself
Information separation and Extraction out.
Embodiment three
As shown in figure 4, embodiment three describes to have in 5G cellular networks time-frequency two-dimensional in the case of multiple narrow band channels
SCMA methods, are exactly changed to dependent situation by the channel in embodiment two, and multiple time slots and multiple channels constitute SCMA together
Resource Block, UE transmits data using this Resource Block.
Step 1：Narrow band channel is divided into time slot, and during by the N number of time slot on multiple arrowbands together as a SCMA
Frequency Resource Block, gives one group of UE and uses.
Comprise the following steps that：
Step 1.1：Each frame on arrowband is divided into time slot, two channels have been respectively divided 10 time slots in Fig. 2, made
It is Typical Disposition, but the present invention supports other flexible time slot dividing modes, is determined by specific wireless network protocol.
Step 1.2：N number of time slot on multiple narrow band channels constitutes a SCMA Resource Block together, distributes to UE and uses.Such as
Shown in Fig. 4, the Slot 1-2 of channel 1 and the Slot 1-2 of channel 2 constitute a Resource Block together, distribute to STA 1-6 and use；
The Slot 3-4 of channel 1 and the Slot 3-4 of channel 2 constitute a Resource Block together, distribute to STA 7-12 and use；
Go to step 2；
Step 2：SCMA Resource Block is using any one mode in authorizing, exempting from mandate and half three kinds of modes of mandate so that UE
Access.
Uplink situation specifically goes to step 3, and descending situation goes to step 4；
Step 3：According to the scheduling rule for using, UE is accessed and is concurrently sent upstream data, is comprised the following steps that.
Step 3.1：Encoded information flow is mapped as N roads signal, and N roads signal and N by the UE that each is accessed according to code book
Individual running time-frequency resource unit corresponds (at least two non-zero signals of UE can be mapped to same running time-frequency resource unit), and
According to running time-frequency resource unit sending signal one by one；
Step 3.2：Base station is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, at this
Multiuser detection is performed after N number of running time-frequency resource unit end of transmission, by the information separation and Extraction of user out.
Step 4：According to the scheduling rule for using, during descending access, comprise the following steps that：
Step 4.1：AP is each mapped to N roads signal, and N roads according to code book, the encoded information flow that will be sent to multiple UE
Signal is corresponded with N number of running time-frequency resource unit, and at least two non-zero signals of UE can be mapped to same running time-frequency resource
Unit, will then be overlapped per signal all the way, and according to running time-frequency resource unit sending signal one by one；
Step 4.2：The UE of data to be received is laggard in the signal that each running time-frequency resource unit receives multiple user's superpositions
Row is preserved, and multiuser detection is performed after N number of running time-frequency resource unit end of transmission, and the information separation and Extraction of itself is gone out
Come.
Example IV
As shown in figure 5, example IV description has the SCMA methods of the time-frequency two-dimensional of the TDMA structures of multiple narrow band channels, will
Multiple narrow band channels are divided into time slot, by multiple channels multiple time slots constitute a SCMA Resource Block, and based on puppet with
Machine sequence carrys out saltus step narrow band channel value, and UE transmits data using this Resource Block.
Step 1：Narrow band channel is divided into time slot, and based on pseudo-random sequence saltus step narrow band channel, AP passes through descending letter
The pseudo-random sequence of UE is informed in order, and N number of time slot of narrow band channel is overall as a time-frequency SCMA Resource Block, is given and is now connect
The UE for entering channel is used.
Step 1.1：Arrowband is divided into time slot, totally 6 channels have been respectively divided 8 time slots in Fig. 4, match somebody with somebody as typical case
Put, but the present invention supports other flexible time slot dividing modes, is determined by specific wireless network protocol.
Step 1.2：N number of time slot on multiple narrow band channels based on pseudo-random sequence saltus step constitutes a SCMA moneys together
Source block, distributes to UE and uses.
Go to step 2；
Step 2：SCMA Resource Block is using any one mode in authorizing, exempting from mandate and half three kinds of modes of mandate so that use
Access at family.
Uplink situation specifically goes to step 3, and descending situation goes to step 4；
Step 3：According to the scheduling rule for using, UE is accessed and is concurrently sent upstream data, is comprised the following steps that：
Step 3.1：Encoded information flow is mapped as N roads signal, and N roads signal and N by the UE that each is accessed according to code book
Individual running time-frequency resource unit is corresponded, and at least two non-zero signals of UE can be mapped to same running time-frequency resource unit, and
According to running time-frequency resource unit sending signal one by one；
Step 3.2：AP is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, in this N
Multiuser detection is performed after the individual running time-frequency resource unit end of transmission, by the information separation and Extraction of user out.
Step 4：According to the scheduling rule for using, during descending access, comprise the following steps that：
Step 4.1：AP is each mapped to N roads signal, and N roads according to code book, the encoded information flow that will be sent to multiple UE
Signal corresponds that (at least two non-zero signals of UE can be mapped to same running time-frequency resource with N number of running time-frequency resource unit
Unit), will be then overlapped per signal all the way, and according to running time-frequency resource unit sending signal one by one；
Step 4.2：The UE of data to be received is laggard in the signal that each running time-frequency resource unit receives multiple user's superpositions
Row is preserved, and multiuser detection is performed after N number of running time-frequency resource unit end of transmission, and the information separation and Extraction of itself is gone out
Come.
Embodiment five
As shown in fig. 6, embodiment five stresses to describe the situation that arrowband IoT in a wlan uses time domain SCMA methods.
Narrow band channel is divided into multiple time slots in TXOP, and N number of time slot is constituted into a SCMA Resource Block, UE is passed using this Resource Block
Transmission of data.
Step 1：Honeycomb is moved or wireless lan communication system is operated in competitive mode, when needing to carry out IoT transmission,
Legacy preamble guard channels are sent first, and the time for indicating this IoT to transmit, interior other STA can not during this period
Contention access channel；
Go to step 2；
Step 2：Trigger Frame are sent, for scheduling of upstream transmissions, in transmission opportunity (Transmission
Opportunity, TXOP) in multiple STA distribution SCMA Resource Block；
Go to step 3；
Step 3：The SCMA Resource Block for distributing is using any one side in authorizing, exempting from mandate and half three kinds of modes of mandate
Formula so that user accesses.
Uplink situation specifically goes to step 4, and descending situation goes to step 5；
Step 4：According to the scheduling rule for using, UE is accessed and is concurrently sent upstream data, is comprised the following steps that：
Step 4.1：Encoded information flow is mapped as N roads signal, and N roads signal and N by the UE that each is accessed according to code book
Individual running time-frequency resource unit is corresponded, and at least two non-zero signals of UE can be mapped to same running time-frequency resource unit, and
According to running time-frequency resource unit sending signal one by one；
Step 4.2：AP is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, in this N
Multiuser detection is performed after the individual running time-frequency resource unit end of transmission, by the information separation and Extraction of user out.
Step 5：According to the scheduling rule for using, during descending access, comprise the following steps that：
Step 5.1：AP is each mapped to N roads signal, and N roads according to code book, the encoded information flow that will be sent to multiple UE
Signal is corresponded with N number of running time-frequency resource unit, and at least two non-zero signals of UE can be mapped to same running time-frequency resource
Unit, will then be overlapped per signal all the way, and according to running time-frequency resource unit sending signal one by one；
Step 5.2：The UE of data to be received is laggard in the signal that each running time-frequency resource unit receives multiple user's superpositions
Row is preserved, and multiuser detection is performed after N number of running time-frequency resource unit end of transmission, and the information separation and Extraction of itself is gone out
Come.
Present invention emulation is intended to contrast time domain non-orthogonal multiple and orthogonal multiple access on network throughput, user's connection number
Performance gain.
The emulation is based on embodiment one, wherein being set to a mac frame per 10ms, each frame is made up of 10 time slots, and the 0th
Individual time slot carries out scheduling of resource, and 1~4 and 5~8 time slots are respectively a SCMA time/frequency source block, the data distribution of each user
It is transmitted in multiple time slots, nonopiate each other, the 9th time slot carries out feedback of the information.
Time domain non-orthogonality parameter based on sparse coding is set：One group of every 6 users share 4 time slots, in a mac frame
In have 2 user's groups, in each data Layer map maximum number of constellation points be 4, in code book nonzero element number be 2, letter
Road coded system uses the LDPC channel codings of 1/2 code check.
Control group is configured using the communication system parameter of QPSK modulation systems, and time domain uses TDMA modes, channel coding side
Formula uses the LDPC channel codings of 1/2 code check.
As shown in fig. 7, under the conditions of number of timeslots identical, the total throughout of time domain non-orthogonal system is about rhombic system
The total throughout of system close to twice, it is nonopiate than orthogonal communication system energy so as to demonstrate in the case of timeslot number identical
There is provided under conditions of smaller or very nearly the same bit error rate, carry 1.5 times of numbers of users, there is provided 1.5 times of total throughout,
With significant performance advantage.
Claims (1)
1. a kind of time-frequency two-dimensional Sparse Code multiple access method towards arrowband Internet of Things, it is characterised in that comprise the steps：
Step 1：System is divided into time slot on arrowband
Honeycomb is moved or wireless lan communication system is divided into time slot on arrowband, goes to step 2, specific works mode according to
The difference of access way is divided into the following two kinds：
Mode 1：System is divided into time slot, and all communication nodes align in time, and node connects on different time slots respectively
Enter channel；
Mode 2：Under the pattern of contention access, now node time need not align system operation, using random competition mode
Channel is accessed, the laggard input time slot pattern of trigger frame is sent in base station, downlink signaling is passed through in base station after all node time alignment
Channel is accessed on ready-portioned time slot；
Step 2：N number of running time-frequency resource unit is constituted into a SCMA time/frequency source block, is moved using honeycomb or wireless local Netcom
Letter system indicates the SCMA time/frequency source blocks to be used for uplink scheduling, up exempt from scheduling, up mixed scheduling and descending；
If time/frequency source block is used for uplink scheduling, 3 are gone to step；
If time/frequency source block exempts from scheduling for up, 4 are gone to step；
If time/frequency source block is used for up mixed scheduling, 5 are gone to step；
If time/frequency source block is used for indicating downlink, 6 are gone to step；
Step 3：The execution uplink scheduling accesses step, comprises the following steps that：
Step 3.1：Scheduled user equipment (UE) will be mapped as N roads according to code book by the encoded information flow after channel coding
Signal, and N roads signals s1, s2, s3..., snWith N number of running time-frequency resource unit r1, r2, r3..., rnCorrespond, at least two UE
Non-zero signal can be mapped to same running time-frequency resource unit, send letter one by one according to the time sequencing of running time-frequency resource unit
Number；
Step 3.2：Base station is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, when N number of
Perform multiuser detection after the frequency Resource Unit end of transmission, the multiuser detection using Message Passing Algorithm or
Maximum likelihood algorithm, you can by the information separation and Extraction of user out；
Step 4：It is described perform it is up exempt from scheduling access step it is as follows：
Step 4.1：UE according to exempt from dispatch access rules：Accessed with probability P or access kept out of the way according to competition and determine whether to access,
The probability P is the random number that base station is informed between 0 to 1 of user in downlink signaling, as do not accessed, is exited up
Exempt from scheduling and access step, step 4.2 is performed if accessing；
Step 4.2：Encoded information flow is mapped as N roads signal, and N roads signal and N number of time-frequency by scheduled UE according to code book
Resource Unit is corresponded, and the non-zero signal of at least two UE is mapped to same running time-frequency resource unit, is provided according to time-frequency
Source unit sending signal one by one；
Step 4.3：Base station is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, when N number of
Multiuser detection is performed after the frequency Resource Unit end of transmission, the multiuser detection is using Message Passing Algorithm or most
Maximum-likelihood algorithm, you can by user profile separation and Extraction out；
Step 5：It is described to perform up mixed scheduling access, comprise the following steps that：
Step 5.1：Without scheduled UE according to exempting from scheduling access rules：Accessed with probability P or access is kept out of the way according to competition
Determine whether to access, up mixed scheduling is exited if not accessing and accesses step, step 5.2 is performed if accessing；
Step 5.2：Encoded information flow is mapped as N roads letter by scheduled UE and the scheduling UE that exempts from of judgement access according to code book
Number, and N roads signal corresponds with N number of running time-frequency resource unit, when the non-zero signal of at least two UE is mapped to same
Frequency Resource Unit, and according to N number of running time-frequency resource unit sending signal one by one；
Step 5.3：Base station is preserved after each running time-frequency resource unit receives the signal of multiple user's superpositions, when N number of
Multiuser detection is performed after the frequency Resource Unit end of transmission, the multiuser detection is using Message Passing Algorithm or most
Maximum-likelihood algorithm, you can by the information separation and Extraction of user out；
Step 6：It is described to perform descending access, comprise the following steps that：
Step 6.1：According to code book, the encoded information flow that will be sent to multiple UE is each mapped to N roads signal, and N roads are believed for base station
Number corresponded with N number of running time-frequency resource unit, the non-zero signal of at least two UE is mapped to same running time-frequency resource unit,
Then the signal that all UE are sent on same channel is overlapped, and according to running time-frequency resource unit sending signal one by one；
Step 6.2：The UE of data to be received is protected after each running time-frequency resource unit receives the signal of multiple user's superpositions
Deposit, multiuser detection is performed after N number of running time-frequency resource unit end of transmission, by the information separation and Extraction of UE itself out.
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