CN108650258A - Narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods - Google Patents
Narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods Download PDFInfo
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- CN108650258A CN108650258A CN201810438221.5A CN201810438221A CN108650258A CN 108650258 A CN108650258 A CN 108650258A CN 201810438221 A CN201810438221 A CN 201810438221A CN 108650258 A CN108650258 A CN 108650258A
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- pdu
- poll
- transmission
- sliding window
- radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/03—Protocol definition or specification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
Abstract
The present invention discloses a kind of narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods, includes the following steps：Step 1, AM receiving entities obtain currently transmitted state report NACK quantity n；Step 2, AM receiving entities allow maximum transmitted time-delay calculation according to NACK quantity n, timer t_reordering and the system of reordering and update the value of Status Disable timer t_StatusProhibit parameters；Step 3, AM transmits entity and calculates the threshold values of triggering poll according to sliding window length, channel transmission rate s and poll retransmission timer t_PollRetransmit, and makes comparisons with the number of PDU in current transmission buffer, if more than poll is then triggered.Such method can solve the problems such as low handling capacity in data transmission procedure, long time delay and sliding window block.
Description
Technical field
The invention belongs to field of communication technology, more particularly to a kind of narrowband Internet of Things radio link protocol sub layer AM entity numbers
According to adaptation transmitter method.
Background technology
With the fast development of the communication technology, mobile communication is from the connection of people and people, to people and object and object and object
Connection stride forward, all things on earth interconnection be inexorable trend.Compared to the short-range communication techniques such as bluetooth, ZigBee, mobile cellular network tool
For wide covering, move and connect greatly the characteristics such as number.Narrowband Internet of Things be on the basis of forth generation mobile communication evolution and
Come, is the tie between attached article and object.NB-IoT is one emerging technology of Internet of Things field, supports low power consuming devices
It is connected in the cellular data of wide area network.NB-IoT supports stand-by time length, the efficient connection to network connectivity requirements higher device,
Meanwhile having the characteristics that at low cost, capacity is big, covering is wide, fully make up the coverage area that current Internet of Things fidonetFido has
The invocation points such as narrow, capacity is small, high bandwidth.Meanwhile in terms of supporting big data, compared to technologies such as bluetooth, Wi-Fi, NB-IoT connects
High in the clouds can directly be uploaded by connecing collected data.
In conclusion narrowband Internet of Things with its low-power consumption, at low cost, capacity is big, covering is wide the features such as cater to current Internet of Things
The demand of development is netted, meanwhile, present and following have more enterprises and research staff enters this field.
But play important adaptation in data transmission procedure according to the protenchyma networking protocol that 3gpp standards propose
Radio link layer (Radio Link Control, RLC) influences system performance big, big, handling capacity that there are data transmission delays
Low problem, sliding window obstruction easily occur leads to data-transmission interruptions phenomenon.
Invention content
It is adaptive to be to provide a kind of narrowband Internet of Things radio link protocol sub layer AM solid datas transmission for the purpose of the present invention
Induction method can solve the problems such as low handling capacity in data transmission procedure, long time delay and sliding window block.
In order to achieve the above objectives, solution of the invention is：
A kind of narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods, include the following steps：
Step 1, AM receiving entities obtain currently transmitted state report NACK quantity n；
Step 2, AM receiving entities allow maximum according to NACK quantity n, timer t_reordering and the system of reordering
Propagation delay time calculates and updates the value of Status Disable timer t_StatusProhibit parameters；
Step 3, AM transmits entity according to sliding window length, channel transmission rate s and poll retransmission timer t_
PollRetransmit calculates the threshold values of triggering poll, and makes comparisons with the number of PDU in current transmission buffer, if more than
Then trigger poll.
Above-mentioned steps 2 comprise the following specific steps that：
Step 21, maximum transmitted time delay t_ is allowed according to NACK quantity n, timer t_reordering and the system of reordering
Maxdelay calculates the value of Status Disable timer t_StatusProhibit；
Step 22, AM receiving entity parameters t_StatusProhibit is updated according to the value of t_StatusProhibit；
Step 23, updated t_StatusProhibit parameters are used for data transmission, while judged whether there is new
State report generates, if there is new state report to generate, return to step 21 repeats if not new state report generates
Step 23.
In above-mentioned steps 21, according to
Calculate the value of Status Disable timer t_StatusProhibit.
Above-mentioned steps 3 comprise the following specific steps that：
Step 31, the length of currently transmitted PDU is combined according to channel transmission rate s, is calculated PDU and is transmitted in physical channel
Required time t_TransPDU；
Step 32, it according to transmission time between t_TransPDU and rlc layer and physical layer, estimates transmission entity and sends one
T_PDU the time required to PDU；
Step 33, the size that the transmission sliding window of entity is transmitted according to the t_PDU of calculating and AM calculates poll threshold values
Threshold；
Step 34, the size of the PDU quantity and poll threshold values Threshold in more currently transmitted sliding window buffer,
Determine whether triggering poll.
In above-mentioned steps 32, according to channel transmission rate s, current PDU length PDU_Length and data in rlc layer and object
Transmission time t between reason layers, utilize t_PDU=PDU_Length*s+2tsIt estimates transmission entity and sends a PDU required time
t_PDU。
In above-mentioned steps 33, according to the t_PDU and size AM_WindowLength of transmission sliding window, utilizeCalculate threshold values Threshold.
In above-mentioned steps 34, if the number for sending the PDU in the buffer of sliding window is greater than or equal to poll threshold values
Threshold is then polled operation, and starts poll retransmission timer t_PollRetransmit and AM receiving entities is waited for pass
Defeated state report, if the number for sending the PDU in the buffer of sliding window is less than poll threshold values Threshold, repeatedly step
34。
After adopting the above scheme, the quantity for the NACK that the present invention is reported according to current state, reorder timer and maximum
Relevant parameter in propagation delay time dynamic adjustment AM solid datas transmission, poll in data transmission is adjusted with specific reference to propagation delay time
Timer value, while according to the reception situation dynamic regulation Status Disable timer t_ for receiving PDU in sliding window
StatusProhibit solves sliding window obstructing problem so that handling capacity as big as possible and reduction are obtained in data transmission procedure
Time delay and then the performance for improving system, it is ensured that the reliability and high efficiency of data protocol stack transmission process realize protocol stack
Reliability service, realize simple, system resource loss is small.
Description of the drawings
Fig. 1 is the overall flow figure of the present invention；
Fig. 2 is that receiving entity t_StatusProhibit parameter adaptives adjust flow chart in the present invention；
Fig. 3 is the poll flow chart that entity is transmitted in the present invention.
Specific implementation mode
Below with reference to attached drawing, technical scheme of the present invention and advantageous effect are described in detail.
Narrowband Internet of Things rlc protocol sublayer safeguards a kind of sliding window mechanism, and sliding is sent to RLC AM transmission entity maintainings
Window safeguards RLC AM receiving entities and receives sliding window.In data transmission procedure, Packet Data Unit (Packet Data
Unit, PDU) it is introduced into the transmission sliding window of RLC transmission entity, it sends sliding window and the PDU in sliding window is sent to bottom,
RLC AM receiving entities receive PDU and are put into and receive in sliding window from bottom, meanwhile, PDU receptions need to be generated by receiving sliding window
State report is simultaneously sent to RLC AM transmission entities, the ARQ (Automatic that the PDU not received with realization is retransmitted
Repeat Request) function, it is ensured that the accuracy of data transmission procedure data.The speed of sliding window sliding determines that data pass
Defeated speed, the frequency that state report is sent determine the time delay and throughput of data transmission.Meanwhile the transmission frequency of state report
Rate is sent the t_PollRetransmit parameters of transmission body, the t_StatusProhibit of RLC AM receiving entities by RLC AM
The influence of parameter and t_reordering parameters and sliding window size.State report transmission excessively can frequently cause frequently to trigger weight
It passes, and then leads to throughput degradation, state report, which sends excessively sluggishness, can lead to time delay rising and sliding window choking phenomenon
Occur.Therefore, the transmission frequency of state report is particularly important.
Based on considerations above, as shown in Figure 1, the present invention provides a kind of narrowband Internet of Things radio link protocol sub layer AM entities
Data transmission adaptive approach, generally speaking includes the following steps：
Step 1, AM receiving entities obtain currently transmitted state report NACK (Negative Acknowledgement)
From POLL PDU to the PDU of sliding window bottom not received in quantity n namely AM receiving entity；
Step 2, AM receiving entities allow maximum pass according to NACK quantity, timer t_Reordering and the system of reordering
Defeated time-delay calculation and the value for updating Status Disable timer t_StatusProhibit parameters；
Step 3, AM transmits entity according to sliding window length, channel transmission rate s and poll retransmission timer t_
PollRetransmit calculates the threshold values of triggering poll, and makes comparisons with the number of PDU in current transmission buffer, if more than
Then trigger poll.
In the step 2, in conjunction with shown in Fig. 2, according to NACK quantity n, reorder timer t_Reordering and system
Allow maximum transmitted time delay t_Maxdelay, Status Disable timer t_StatusProhibit parameters are calculated using following formula
Value：
Then, then by the t_StatusProhibit parameters of above result of calculation update to AM receiving entities, for next time
It is used when receiving data, until new state report generates.
Coordinate shown in Fig. 3, be the specific implementation process of step 3, and emphasis of the invention, is added by transmitting entity to AM
Add a threshold values Threshold to be used for triggering the poll of transmission entity, and starts poll retransmission timer t_
PollRetransmit, AM transmit entity according to current sliding window cache in PDU numbers be polled, pass through add a valve
Value is compared with the PDU numbers in currently transmitted buffer, for triggering the poll of transmission entity, it is ensured that send at sliding window
In non-blocking state.
In step 3, first according to channel transmission rate s, current PDU length PDU_Length and data rlc layer with
Transmission time t between physical layers, estimate transmission entity and send t_PDU the time required to a PDU, calculation formula is as follows：
T_PDU=PDU_Length*s+2ts
Then, according to the t_PDU and size AM_WindowLength of transmission sliding window, following formula is utilized to calculate threshold values
Threshold：
Finally, the PDU transmitted to AM in the transmission sliding window buffer of entity carries out counting count, and by count and valve
Value Threshold is compared, and when count is greater than or equal to Threshold, triggers poll, and start timer t_
PollRetransmit。
A kind of narrowband Internet of Things radio link protocol sub layer AM entity transmission adaptive approach provided by the invention, by adding
The t_StatusProhibit parameters of the poll threshold values and AM receptions that add AM transmission entities are passed with current sliding window length, channel
Defeated rate and system allow maximum transmitted time delay to combine, and the state dynamic by sending buffer and order caching device is adjusted
The poll of the parameter value and triggering transmission entity of whole AM receiving entities, it is ensured that the reliability in data transmission and high efficiency,
Flexibly easily realize the reliability service of communication system.
Above example is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every
According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention
Within.
Claims (7)
1. a kind of narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods, it is characterised in that including such as
Lower step：
Step 1, AM receiving entities obtain currently transmitted state report NACK quantity n；
Step 2, AM receiving entities allow maximum transmitted according to NACK quantity n, timer t_reordering and the system of reordering
Time-delay calculation and the value for updating Status Disable timer t_StatusProhibit parameters；
Step 3, AM transmits entity according to sliding window length, channel transmission rate s and poll retransmission timer t_
PollRetransmit calculates the threshold values of triggering poll, and makes comparisons with the number of PDU in current transmission buffer, if more than
Then trigger poll.
2. narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods as described in claim 1,
It is characterized in that：The step 2 comprises the following specific steps that：
Step 21, maximum transmitted time delay t_ is allowed according to NACK quantity n, timer t_reordering and the system of reordering
Maxdelay calculates the value of Status Disable timer t_StatusProhibit；
Step 22, AM receiving entity parameters t_StatusProhibit is updated according to the value of t_StatusProhibit；
Step 23, updated t_StatusProhibit parameters are used for data transmission, while judge whether there is new state
Report generation, if there is new state report to generate, return to step 21, if not new state report generates, repeatedly step
23。
3. narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods as claimed in claim 2,
It is characterized in that：In the step 21, according to
Calculate the value of Status Disable timer t_StatusProhibit.
4. narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods as described in claim 1,
It is characterized in that：The step 3 comprises the following specific steps that：
Step 31, the length of currently transmitted PDU is combined according to channel transmission rate s, calculates PDU needed for physical channel transmission
Time t_TransPDU；
Step 32, it according to transmission time between t_TransPDU and rlc layer and physical layer, estimates transmission entity and sends a PDU
Required time t_PDU；
Step 33, the size that the transmission sliding window of entity is transmitted according to the t_PDU of calculating and AM calculates poll threshold values
Threshold；
Step 34, the size of the PDU quantity and poll threshold values Threshold in more currently transmitted sliding window buffer, to
Determine whether to trigger poll.
5. narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods as claimed in claim 4,
It is characterized in that：In the step 32, according to channel transmission rate s, current PDU length PDU_Length and data rlc layer with
Transmission time t between physical layers, utilize t_PDU=PDU_Length*s+2tsOne PDU of transmission entity transmission is estimated to be taken
Between t_PDU.
6. narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods as claimed in claim 4,
It is characterized in that：In the step 33, according to the t_PDU and size AM_WindowLength of transmission sliding window, utilizeCalculate threshold values Threshold.
7. narrowband Internet of Things radio link protocol sub layer AM solid data adaptation transmitter methods as claimed in claim 4,
It is characterized in that：In the step 34, if the number for sending the PDU in the buffer of sliding window is greater than or equal to poll threshold values
Threshold is then polled operation, and starts poll retransmission timer t_PollRetransmit and AM receiving entities is waited for pass
Defeated state report, if the number for sending the PDU in the buffer of sliding window is less than poll threshold values Threshold, repeatedly step
34。
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