CN107682841A - Lead code distribution method based on different delay services in M2M communication - Google Patents
Lead code distribution method based on different delay services in M2M communication Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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Abstract
The invention discloses a lead code distribution method based on different delay services in M2M communication, which comprises the steps of firstly grouping M2M devices, generating a series of lead codes which are used independently for each group, then preferentially selecting the lead codes by the devices with high priority in each group, and then broadcasting the selected lead code sequence number in the group to prevent collision caused by the fact that a plurality of devices select the same lead code. The invention not only can meet the time delay requirement of high-priority services and reduce the average access time delay of the M2M equipment, but also can avoid lead code selection conflict to the maximum extent and reduce the access conflict rate.
Description
Technical field
The invention belongs to machine communication technical field, based on the leading of different delay business in particularly a kind of M2M communication
Code distributing method.
Background technology
M2M (Machine-to-Machine) communications refer to that equipment can be in the case of no human intervention by wired
Or wirelessly transmit information.With the arrival of the Internet of things era, the M2M communication that 3GPP tissues propose has become Internet of Things
The basis of Network Communication.The thousands of M2M equipment of global deployment is used for environment sensing and machine and interacted, and equipment and equipment and sets
A huge Internet of things system is set up in the standby interconnection and interflow between base station jointly.
Due to the huge commercial value of M2M business and wide application prospect, such as intelligent transportation, intelligent grid, earthquake
Monitoring, consumer device, smart home, public safety and intelligent medical etc., M2M communication are just attracting increasing notice.No
The responsible business of the M2M equipment of same type is different, and all kinds of business equally have different requirements to different performance.Certain some
Urgent scene, such as disaster and power failure, machine node is needed to M2M server reporting emergency alarms, including the type of disaster and
The place of disaster.For example, for being deployed in the fire perceiving device in forest farm colliery, needed when there is the generation of the dangerous situations such as fire
Data are transmitted in time, and sensors with auxiliary electrode is higher to delay requirement, when the data for having emergency need transmission, it is necessary to preferential
Ensure the service access base station of high priority.
But prior art the problem of existing, is：Lead code distribution design scheme is complicated, and effect is not notable, it is impossible to full
Delay requirement of the foot to the M2M equipment of delay sensitive.
The content of the invention
It is full it is an object of the invention to provide the leading code distributing method based on different delay business in a kind of M2M communication
The low time delay requirement of sufficient urgency traffic, while ensure that the average delay of all devices in cell is as far as possible smaller.
The technical solution for realizing the object of the invention is：A kind of leading code distributing method based on different delay business,
Comprise the following steps：
(10) M2M device packets are completed：Cell is divided into K groups centered on base station, all M2M equipment are according to its space
Position determines the packet where oneself；
(20) each packet produces lead code：Each packet indexes according to respective produces lead code, caused by each group
Lead code is used for this group of equipment Stochastic accessing and used；
(30) M2M equipment selection lead code：The high equipment prioritizing selection lead code of priority in each packet, other are low excellent
First level equipment actively sells selecting priority；
(40) lead code selected by M2M device broadcasts：Higher priority devices are grouped after selected lead code at place
The lead code of oneself selection of middle broadcast, avoids during follow-up equipment reselection lead code selecting identical lead code；
(50) Stochastic accessing base station is completed：M2M equipment is successfully selected after lead code, continues what is defined according to 3GPP standards
Random access procedure access base station.
Further, the step of M2M device packets are：
(11) cell group quantity is determined：By average access delay as optimization aim, average access delay is established with dividing
Functional relation between group quantity, so that it is determined that cell group quantity；
(12) each group coverage distance is determined：Each it is grouped centered on the position of base station, first group is round, other packets
It is annulus, determines the coverage distance of each group, obtains the group result of cell to the end；
(13) equipment determines affiliated be grouped：According to the relation between equipment to base station distance and each group coverage distance, it is determined that
Packet belonging to each equipment；
Further, the step of each packet generation lead code is：
(21) each group produces ZC sequences：According to the root call number of each packet and given sequence length generation ZC sequences
Row；
(22) each group determines the cyclic shift cycle：When the cyclic shift cycle is greater than the maximum round trip of base station and cell edge
Prolong, there is specific formula calculated relationship in the cyclic shift cycle with radius of society, ZC sequence lengths and ZC sequence of interval, can be true
The size in cyclic shift cycle；
Cyclic shift cycle NCSExpression formula be：
Wherein, R is radius of society, τdsIt is maximum propagation time delay, NZCRepresent ZC sequence lengths, TSEQRepresent the generation of ZC sequences
The length of interval of lead code, ngIt is the sample size of Additional Protection；
(23) each group produces lead code：One cyclic shift cycle of ZC sequence cyclic shifts is produced into lead code, every group of production
Raw leading number of codes is relevant with the cyclic shift cycle size of ZC sequence lengths and every group；
Preamble sequence caused by ZC sequence cyclic shifts n is expressed as：
Wherein NCSRepresent cyclic shift cycle, NZCRepresent ZC sequence lengths.
Further, the step of M2M equipment selection lead code includes：
(31) M2M equipment determines optional lead code：Each M2M equipment is according to the lead code of this group and the feelings used
Condition determines the lead code that oneself can be selected；
(32) priority of M2M equipment is determined：The difference of the data traffic types transmitted according to equipment, by M2M equipment point
For different priorities；
(33) higher priority devices selection lead code：Higher priority devices have the right of prioritizing selection lead code；
(34) judge whether higher priority devices select to finish：If being currently accessed in time slot does not have higher priority devices choosing
Lead code is selected, then can proceed with step (35), otherwise step (33) continues, until meeting all higher priority devices
Demand；
(35) low priority equipment selection lead code：Low priority equipment selects leading in remaining available lead code
Code.
Further, the step of M2M device broadcasts lead code includes：
(41) the selected lead code of higher priority devices broadcast：Point at the backward place of higher priority devices selection lead code
Group broadcasts lead code numbering, and the equipment with same high priority does not also select the lead code broadcasted；
(42) low priority equipment determines available lead code：After low priority equipment receives broadcast message, oneself is updated
Usable lead code.
Further, the step of described (50) Stochastic accessing, includes：
M2M equipment is successfully selected the lead code sent to after lead code selected by base station；Base station is arranged by the lead code received
Sequence and for these equipment distribute resource block, subsequent base station by lead code number and distribute resource block return to M2M equipment；If
It is standby receive information after continue to transmit the ID number of itself to base station；After base station decodes the ID number, the decoded ID number of equipment is returned to,
The success of equipment Stochastic accessing base station.
Compared with prior art, its remarkable advantage is the present invention：
(1) high-priority service demand is met：The present invention pays the utmost attention to the business high to delay requirement and is defined as
High-priority service, such business can meet the needs of low time delay with prioritizing selection lead code so as to preferentially complete Stochastic accessing；
(2) average access delay and access interference rate are reduced：The present invention makes all M2M device packets, each group in cell
Lead code is not interfere with each other, so as to reduce each group equipment before the selection leading code when the selection collision problem that occurs, it is and then maximum
Access interference is avoided to limit, therefore average access delay decreases；
(3) the ingenious novelty of method, complexity are low：The group technology and leading code distributing method that the present invention uses are more new
Grain husk, and complexity is not high is just used with being generalized in Practical Project.
Brief description of the drawings
Fig. 1 is the main flow chart for the leading code distributing method that the present invention requires business for different delay.
Fig. 2 is the flow chart of cell device packets step in Fig. 1.
Fig. 3 is the flow chart that each group generates lead code step in Fig. 1.
Fig. 4 is the flow chart that equipment selects lead code step in Fig. 1.
Fig. 5 is the flow chart of device broadcasts lead code step in Fig. 1.
Fig. 6 is the system model figure that lead code distribution combines cell group in Fig. 1.
Fig. 7 is random access procedure schematic diagram.
Embodiment
As shown in figure 1, the leading code distributing method based on different delay business in a kind of M2M communication, comprises the following steps：
(10) M2M device packets are completed：Cell is divided into K groups centered on base station, all M2M equipment are according to its space
Position determines the packet where oneself；
As shown in Fig. 2 (10) the cell equipment packet step includes：
(11) cell group quantity is determined：, will be flat in order to meet that the average access delay of all devices in cell is as far as possible small
Equal access delay establishes average functional relation between access delay and number of packet, so that it is determined that cell as optimization aim
Number of packet；
(12) each group coverage distance is determined：Group technology is shown in accompanying drawing 6, is each grouped centered on the position of base station, the
One group is round, and other packets are annulus, determine that the coverage distance of each group can determine that the group result of last cell.In order that
Average access delay is minimum, determines the coverage distance of each group one by one；
(13) equipment determines affiliated be grouped：The characteristics of based on M2M equipment, i.e., equipment has the characteristics of Hypomobility, typically
Device location immobilizes, according to the relation between equipment to base station distance and each group coverage distance, so that it is determined that each equipment
Affiliated packet.
(20) each packet produces lead code：Each packet indexes according to respective produces lead code, caused by each group
Lead code is used for this group of equipment Stochastic accessing and used；
As shown in figure 3, (20) each group generation lead code step is specially：
(21) each group produces ZC sequences：According to the root call number of each packet and given sequence length generation ZC
(Zadeoff-Chu) sequence.Because the root call number of each packet is different, so lead code is different caused by each group, respectively
Group equipment is used independently respective lead code, in the absence of the relation vied each other；
(22) each group determines the cyclic shift cycle：When the cyclic shift cycle is greater than the maximum round trip of base station and cell edge
Prolong, there is specific formula calculated relationship in the cyclic shift cycle with radius of society, ZC sequence lengths and ZC sequence of interval, can be true
The size in cyclic shift cycle；
Cyclic shift cycle NCSExpression formula be：
Wherein, R is radius of society (km), τdsIt is maximum propagation time delay (microsecond), NZCRepresent ZC sequence lengths, TSEQTable
Show the length of interval (rice) of ZC sequences generation lead code, ngIt is the sample size of Additional Protection.It can thus be appreciated that the cyclic shift cycle
With the relation of radius of society, ZC sequence lengths and ZC sequence of interval.
(23) each group produces lead code：One cyclic shift cycle of ZC sequence cyclic shifts can be produced into lead code, often
Leading number of codes caused by group is relevant with the cyclic shift cycle size of ZC sequence lengths and every group.
Preamble sequence caused by ZC sequence cyclic shifts n is expressed as：
Wherein NCSRepresent cyclic shift cycle, NZCRepresent ZC sequence lengths.
(30) M2M equipment selection lead code：The high equipment of priority can be with prioritizing selection lead code in each packet, other
Low priority equipment actively sells selecting priority；
As shown in figure 4, (30) the equipment selection lead code step includes：
(31) M2M equipment determines optional lead code：Each M2M equipment is according to the lead code of this group and the feelings used
Condition determines the lead code that oneself can be selected；
(32) priority of M2M equipment is determined：The difference of the data traffic types transmitted according to equipment, by M2M equipment point
For different priorities.What promptly class business need access delay was as small as possible is considered as high priority, otherwise is low priority；
(33) higher priority devices selection lead code：Higher priority devices have the right of prioritizing selection lead code, still
When multiple higher priority devices select same lead code in synchronization, as a result will cause to select simultaneous selection same preamble
Competitive relation be present during leading code before the selection in equipment all access failures, these equipment.But higher priority devices with it is low
Competitive relation is not present between priority device, because higher priority devices first select, selects, will not go out after low priority equipment
The situation of the same lead code of existing simultaneous selection；
(34) judge whether higher priority devices select to finish：If being currently accessed in time slot does not have higher priority devices choosing
Lead code is selected, then can proceed with step (35), otherwise step (33) continues, until meeting all higher priority devices
Demand；
(35) low priority equipment selection lead code：Low priority equipment selects leading in remaining available lead code
Code.
(40) lead code selected by M2M device broadcasts：Higher priority devices are grouped after selected lead code at place
The lead code of oneself selection of middle broadcast, avoids during follow-up equipment reselection lead code selecting identical lead code；
As shown in figure 5, (40) the device broadcasts lead code step includes：
(41) the selected lead code of higher priority devices broadcast：Point at the backward place of higher priority devices selection lead code
Group broadcasts lead code numbering, and the equipment with same high priority does not also select the lead code broadcasted, and avoids occurring leading
Code conflict；
(42) low priority equipment determines available lead code：After low priority equipment receives broadcast message, oneself is updated
Usable lead code, avoid the lead code broadcasted of selection.
(50) Stochastic accessing base station is completed：M2M equipment is successfully selected after lead code, continues what is defined according to 3GPP standards
Random access procedure access base station, detailed process refer to accompanying drawing 7.
(50) follow-up the step of completing Stochastic accessing, includes：
M2M equipment is successfully selected the lead code sent to after lead code selected by base station；Base station is arranged by the lead code received
Sequence and for these equipment distribute resource block, subsequent base station by lead code number and distribute resource block return to M2M equipment；If
It is standby receive information after continue to transmit the ID number of itself to base station；After base station decodes the ID number, the decoded ID number of equipment is returned to,
The success of equipment Stochastic accessing base station.
Fig. 6 show system model figure of the lead code distribution with reference to cell group.In figure, G1,G2,...,GKRepresent K points
Group.Square nodes represent higher priority devices, and circular node represents low priority equipment.G1And G2Root call number r1And r2Production
Raw lead code is different.Respectively there is an equipment to select lead code p in two packets1, but will not produce each other
Conflict, because middle lead code p before two packets1It is different.
M2M equipment is divided into K part, the set of all devices in cell, G={ G are represented using set G1,G2,...,
GK, and meet G1∩G2∩...∩GK=φ, | G1|+|G2|+...+|GK|=N, wherein | G represents M2M equipment in set G
Quantity, N is the quantity of all devices in cell.Coverage distance set expression is { R1,R2,...,RK}.First group of M2M is set
It is standby positioned at radius be R1Circular scope in, other groups are the M2M equipment fallen in respective rings, for example, second group of M2M equipment
It is R to be positioned over scope2Annular extent in.It is different to be each grouped the root call number used, { r1,r2,...,rK, from
And ensure that the lead code that is selected between different groups of equipment is different.
The present invention can not only meet the delay requirement of the high business of priority, reduce the average access delay of M2M equipment, and
And lead code selection conflict can be avoided to greatest extent, reduce access interference rate.
Claims (6)
1. the leading code distributing method based on different delay business in a kind of M2M communication, it is characterised in that comprise the following steps：
(10) M2M device packets are completed：Cell is divided into K groups centered on base station, all M2M equipment are according to its locus
Determine the packet where oneself；
(20) each packet produces lead code：Each packet indexes according to respective produces lead code, leading caused by each group
Code is used for this group of equipment Stochastic accessing and used；
(30) M2M equipment selection lead code：The high equipment prioritizing selection lead code of priority, other low priorities in each packet
Equipment actively sells selecting priority；
(40) lead code selected by M2M device broadcasts：Higher priority devices after selected lead code, it is wide in a packet
The lead code of oneself selection is broadcast, avoids during follow-up equipment reselection lead code selecting identical lead code；
(50) Stochastic accessing base station is completed：M2M equipment is successfully selected after lead code, continues to define according to 3GPP standards random
Access procedure access base station.
2. the leading code distributing method based on different delay business, its feature exist in M2M communication according to claim 1
It is in the step of, M2M device packets：
(11) cell group quantity is determined：Averagely as optimization aim, average access delay and packet count will be established by access delay
Functional relation between amount, so that it is determined that cell group quantity；
(12) each group coverage distance is determined：Each it is grouped centered on the position of base station, first group is round, and other packets are
Annulus, the coverage distance of each group is determined, obtain the group result of cell to the end；
(13) equipment determines affiliated be grouped：According to the relation between equipment to base station distance and each group coverage distance, it is determined that each
Packet belonging to equipment.
3. the leading code distributing method based on different delay business, its feature exist in M2M communication according to claim 1
In respectively the step of packet generation lead code is：
(21) each group produces ZC sequences：According to the root call number of each packet and given sequence length generation ZC sequences；
(22) each group determines the cyclic shift cycle：The cyclic shift cycle is greater than the maximum round trip time delay of base station and cell edge,
There is specific formula calculated relationship in the cyclic shift cycle with radius of society, ZC sequence lengths and ZC sequence of interval, can determine
The size in cyclic shift cycle；
Cyclic shift cycle NCSExpression formula be：
Wherein, R is radius of society, τdsIt is maximum propagation time delay, NZCRepresent ZC sequence lengths, TSEQRepresent that the generation of ZC sequences is leading
The length of interval of code, ngIt is the sample size of Additional Protection；
(23) each group produces lead code：One cyclic shift cycle of ZC sequence cyclic shifts is produced into lead code, caused by every group
Leading number of codes is relevant with the cyclic shift cycle size of ZC sequence lengths and every group；
Preamble sequence caused by ZC sequence cyclic shifts n is expressed as：
Wherein NCSRepresent cyclic shift cycle, NZCRepresent ZC sequence lengths.
4. the leading code distributing method based on different delay business, its feature exist in M2M communication according to claim 1
Include in the step of, M2M equipment selection lead code：
(31) M2M equipment determines optional lead code：Each M2M equipment is true according to the lead code of this group and situation about having used
The fixed lead code that oneself can be selected；
(32) priority of M2M equipment is determined：The difference of the data traffic types transmitted according to equipment, M2M equipment is divided into not
Same priority；
(33) higher priority devices selection lead code：Higher priority devices have the right of prioritizing selection lead code；
(34) judge whether higher priority devices select to finish：If it is currently accessed in time slot before not having higher priority devices selection
Leading code, then step (35) is can proceed with, otherwise step (33) continues, the need until meeting all higher priority devices
Ask；
(35) low priority equipment selection lead code：Low priority equipment selects lead code in remaining available lead code.
5. the leading code distributing method based on different delay business, its feature exist in M2M communication according to claim 1
Include in the step of, M2M device broadcasts lead code：
(41) the selected lead code of higher priority devices broadcast：The packet at the backward place of higher priority devices selection lead code is wide
Lead code numbering is broadcast, the equipment with same high priority does not also select the lead code broadcasted；
(42) low priority equipment determines available lead code：After low priority equipment receives broadcast message, update oneself can
Use lead code.
6. the leading code distributing method based on different delay business, its feature exist in M2M communication according to claim 1
Include in the step of, (50) Stochastic accessing：
M2M equipment is successfully selected the lead code sent to after lead code selected by base station；The lead code received is sorted simultaneously base station
And resource block is distributed for these equipment, the resource block that lead code is numbered and distributed is returned to M2M equipment by subsequent base station；Equipment is received
Continue to transmit the ID number of itself to base station after to information；After base station decodes the ID number, the decoded ID number of equipment, equipment are returned to
The success of Stochastic accessing base station.
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| CN108738161A (en) * | 2018-04-28 | 2018-11-02 | 南京邮电大学 | Accidental access method based on different delay demand device packets in a kind of machine type communication |
| CN110213823A (en) * | 2019-04-28 | 2019-09-06 | 北京邮电大学 | A kind of accidental access method and device of narrowband Internet of Things |
| CN112218384A (en) * | 2020-09-24 | 2021-01-12 | 中国科学院上海微系统与信息技术研究所 | Distributed queue random access method based on priority |
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| CN108738161A (en) * | 2018-04-28 | 2018-11-02 | 南京邮电大学 | Accidental access method based on different delay demand device packets in a kind of machine type communication |
| CN110213823A (en) * | 2019-04-28 | 2019-09-06 | 北京邮电大学 | A kind of accidental access method and device of narrowband Internet of Things |
| CN110213823B (en) * | 2019-04-28 | 2021-12-21 | 北京邮电大学 | Random access method and device for narrowband Internet of things |
| CN112218384A (en) * | 2020-09-24 | 2021-01-12 | 中国科学院上海微系统与信息技术研究所 | Distributed queue random access method based on priority |
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Application publication date: 20180209 |