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CN108650258B - An adaptive method for AM entity data transmission in the wireless link protocol sublayer of narrowband Internet of Things - Google Patents

An adaptive method for AM entity data transmission in the wireless link protocol sublayer of narrowband Internet of Things Download PDF

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CN108650258B
CN108650258B CN201810438221.5A CN201810438221A CN108650258B CN 108650258 B CN108650258 B CN 108650258B CN 201810438221 A CN201810438221 A CN 201810438221A CN 108650258 B CN108650258 B CN 108650258B
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赵炯
刘昊
姚国良
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Southeast University Wuxi Institute Of Integrated Circuit Technology
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    • 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
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • 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
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Abstract

本发明公开一种窄带物联网无线链路协议子层AM实体数据传输自适应方法，包括如下步骤：步骤1，AM接收实体获取当前发送的状态报告NACK数量n；步骤2，AM接收实体根据NACK数量n、重排序定时器t_reordering和系统允许最大传输时延计算并更新状态禁止定时器t_StatusProhibit参数的值；步骤3，AM传输实体根据滑动窗长度、信道传输速率s和轮询重传定时器t_PollRetransmit计算触发轮询的阀值，并与当前的发送缓存器中PDU的个数作比较，若大于则触发轮询。此种方法可解决数据传输过程中的吞吐量低、大时延和滑动窗阻塞等问题。

Figure 201810438221

The invention discloses an adaptive method for AM entity data transmission in the wireless link protocol sublayer of the narrowband Internet of Things, which comprises the following steps: Step 1, the AM receiving entity obtains the number n of the NACKs of the status report currently sent; The number n, the reordering timer t_reordering and the maximum transmission delay allowed by the system calculate and update the value of the status prohibition timer t_StatusProhibit parameter; step 3, the AM transmission entity is based on the sliding window length, the channel transmission rate s and the polling retransmission timer t_PollRetransmit Calculate the threshold for triggering polling, and compare it with the current number of PDUs in the transmit buffer. If it is greater than that, trigger polling. This method can solve the problems of low throughput, large delay and sliding window blocking during data transmission.

Figure 201810438221

Description

Self-adaptive method for AM entity data transmission of narrow-band Internet of things wireless link protocol sublayer
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a narrowband Internet of things wireless link protocol sub-layer AM entity data transmission self-adaption method.
Background
With the rapid development of communication technology, mobile communication is moving from human-to-human connection to human-to-object and object-to-object connection, and the necessity of everything interconnection is a trend. Compared with short-distance communication technologies such as Bluetooth and ZigBee, the mobile cellular network has the characteristics of wide coverage, mobility, large connection number and the like. The narrowband internet of things is evolved on the basis of fourth-generation mobile communication and is a link for connecting objects. NB-IoT is an emerging technology in the field of Internet of things and supports cellular data connection of low-power consumption equipment in a wide area network. The NB-IoT supports efficient connection of equipment with long standby time and high requirement on network connection, has the characteristics of low cost, large capacity, wide coverage and the like, and fully makes up the points of narrow coverage, small capacity, high bandwidth and the like of the current Internet of things protocol. Meanwhile, in the aspect of supporting big data, compared with technologies such as Bluetooth and Wi-Fi, the data collected by the NB-IoT connection can be directly uploaded to the cloud.
In summary, the narrowband internet of things meet the current development requirements of the internet of things by virtue of the characteristics of low power consumption, low cost, large capacity, wide coverage and the like, and meanwhile, more enterprises and research and development personnel can enter the field at present and in the future.
However, a Radio Link Control (RLC) layer playing an important adaptation role in a data transmission process according to a narrowband internet of things protocol proposed by the 3gpp standard has a large influence on system performance, and has the problems of large data transmission delay and low throughput, and a phenomenon of data transmission interruption due to sliding window blocking is easily caused.
Disclosure of Invention
The invention aims to provide a narrow-band Internet of things wireless link protocol sublayer AM entity data transmission self-adaption method which can solve the problems of low throughput, large time delay, sliding window blockage and the like in the data transmission process.
In order to achieve the above purpose, the solution of the invention is:
a self-adaptive method for transmitting data of an AM entity of a wireless link protocol sublayer of a narrow-band Internet of things comprises the following steps:
step 1, an AM receiving entity acquires the number n of currently sent status reports NACK;
step 2, the AM receiving entity calculates and updates the value of the parameter of the state prohibition timer t _ StatusProhibit according to the NACK number n, the reordering timer t _ reordering and the maximum transmission time delay allowed by the system;
and step 3, the AM transmission entity calculates a threshold value for triggering polling according to the length of the sliding window, the channel transmission rate s and the polling retransmission timer t _ PollRecransmit, compares the threshold value with the number of the PDUs in the current sending buffer, and triggers polling if the threshold value is larger than the threshold value.
The step 2 comprises the following specific steps:
step 21, calculating the value of a state prohibition timer t _ StatusProhibit according to the NACK number n, a reordering timer t _ reordering and the maximum transmission delay t _ Maxdelay allowed by the system;
step 22, updating the AM receiving entity parameter t _ StatusProhibit according to the value of t _ StatusProhibit;
and step 23, using the updated t _ statupprioit parameter for data transmission, and meanwhile, judging whether a new status report is generated, if so, returning to the step 21, and if not, repeating the step 23.
In the above step 21, according to
Figure BDA0001655193440000021
The value of the status prohibit timer t _ statusprhibit is calculated.
The step 3 comprises the following specific steps:
step 31, calculating time t _ TransPDU required by PDU transmission in a physical channel according to the channel transmission rate s and the length of the currently transmitted PDU;
step 32, according to t _ TransPDU and the transmission time between RLC layer and physical layer, estimating the time t _ PDU needed by transmitting one PDU by transmission entity;
step 33, calculating a polling Threshold according to the calculated t _ PDU and the size of the transmission sliding window of the AM transmission entity;
step 34, comparing the number of PDUs in the current transmission sliding window buffer with the size of the polling Threshold, thereby determining whether to trigger polling.
In the above step 32, according to the channel transmission rate s, the current PDU Length and the transmission time t of data between the RLC layer and the physical layersUsing t _ PDU _ Length s +2tsThe time t _ PDU required for the transmitting entity to transmit a PDU is estimated.
In the above step 33, according to t _ PDU and transmission slipWindow size AM _ WindowLength, using
Figure BDA0001655193440000031
The Threshold is calculated.
In step 34, if the number of PDUs in the buffer for sending the sliding window is greater than or equal to the polling Threshold, a polling operation is performed, and a polling retransmission timer t _ poll _ retransmission is started to wait for the AM to receive the transmission status report of the entity, and if the number of PDUs in the buffer for sending the sliding window is less than the polling Threshold, step 34 is repeated.
After the scheme is adopted, the invention dynamically adjusts relevant parameters in AM entity data transmission according to the NACK number, the reordering timer and the maximum transmission delay of the current state report, particularly adjusts the value of the polling timer in data transmission according to the transmission delay, and at the same time, dynamically adjusts the state prohibition timer t _ StatusProhibit according to the receiving condition of the PDU in the receiving sliding window, thereby solving the problem of sliding window blockage, obtaining throughput as large as possible and reducing delay in the data transmission process so as to improve the performance of the system, ensuring the reliability and high efficiency of the data protocol stack transmission process, realizing the reliable operation of the protocol stack, simple realization and small system resource loss.
Drawings
FIG. 1 is an overall flow diagram of the present invention;
FIG. 2 is a diagram of the adaptive rectification of the t _ StatusProhibit parameter of the receiving entity in the present invention;
fig. 3 is a flow chart of polling of the transmitting entities in the present invention.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
The sub-layer of the RLC protocol of the narrow-band Internet of things maintains a sliding window mechanism, a sending sliding window is maintained for an RLC AM transmission entity, and a receiving sliding window is maintained for an RLC AM receiving entity. In the Data transmission process, a Packet Data Unit (PDU) firstly enters a sending sliding window of an RLC transmission entity, the sending sliding window sends the PDU in the sliding window to a bottom layer, an RLC AM receiving entity receives the PDU from the bottom layer and puts the PDU into a receiving sliding window, and meanwhile, the receiving sliding window needs to generate a PDU receiving status report and sends the PDU receiving status report to the RLC AM transmission entity, so that the ARQ (automatic Repeat request) function of retransmitting the PDU which is not received is realized, and the accuracy of Data in the Data transmission process is ensured. The speed of sliding of the sliding window determines the speed of data transmission, and the frequency of sending the status report determines the time delay and the throughput rate of the data transmission. Meanwhile, the sending frequency of the status report is affected by the t _ polltransmit parameter of the RLC AM sending transmitter, the t _ statupphirit parameter and the t _ reordering parameter of the RLC AM receiving entity, and the size of the sliding window. The condition report is sent too frequently, so that retransmission is triggered frequently, the throughput is reduced, and the delay is increased and the sliding window is blocked due to too late state report sending. Therefore, the frequency of transmission of status reports is particularly important.
Based on the above consideration, as shown in fig. 1, the invention provides a narrowband internet of things wireless link protocol sublayer AM entity data transmission adaptive method, which overall comprises the following steps:
step 1, an AM receiving entity obtains the number n of currently sent status reports NACK (negative acknowledgement), namely the PDU from POLL PDU to the unreceived PDU at the bottom of a sliding window in the AM receiving entity;
step 2, the AM receiving entity calculates and updates the value of the parameter of the state prohibition timer t _ StatusProhibit according to the NACK number, the Reordering timer t _ Reordering and the maximum transmission time delay allowed by the system;
and step 3, the AM transmission entity calculates a threshold value for triggering polling according to the length of the sliding window, the channel transmission rate s and the polling retransmission timer t _ PollRecransmit, compares the threshold value with the number of the PDUs in the current sending buffer, and triggers polling if the threshold value is larger than the threshold value.
In step 2, with reference to fig. 2, according to the NACK number n, the Reordering timer t _ Reordering, and the system allowed maximum transmission delay t _ Maxdelay, the value of the parameter t _ StatusProhibit of the status prohibition timer is calculated by using the following formula:
Figure BDA0001655193440000041
then, the above calculation result is updated to the t _ StatusProhibit parameter of the AM receiving entity for use when receiving data next time until a new status report is generated.
As shown in fig. 3, the specific implementation process of step 3 is also the key point of the present invention, a Threshold is added to an AM transmission entity to trigger polling of the transmission entity, and a polling retransmission timer t _ poll is started, the AM transmission entity performs polling according to the number of PDUs in the current sliding window buffer, and a Threshold is added to compare with the number of PDUs in the current transmission buffer to trigger polling of the transmission entity, so as to ensure that the transmission sliding window is in a non-blocking state.
In step 3, firstly, according to the channel transmission rate s, the current PDU Length PDU and the transmission time t between RLC layer and physical layersEstimating the time t _ PDU required by the transmission entity to send a PDU, wherein the calculation formula is as follows:
t_PDU＝PDU_Length*s+2ts
then, according to t _ PDU and AM _ WindowLength of the size of the transmission sliding window, a Threshold is calculated by using the following formula:
Figure BDA0001655193440000051
and finally, counting the PDUs in the transmission sliding window buffer of the AM transmission entity, comparing the count with a Threshold, triggering polling when the count is greater than or equal to the Threshold, and starting a timer t _ PollRecransmit.
The invention provides a transmission self-adapting method of a narrow-band Internet of things wireless link protocol sub-layer AM entity, which combines a polling threshold value of the AM transmission entity, a t _ StatusProhibit parameter received by the AM with the current sliding window length, a channel transmission rate and the maximum allowable transmission delay of a system, dynamically adjusts the parameter value of the AM receiving entity and triggers the polling of the transmission entity through the states of a sending buffer and a receiving buffer, can ensure the reliability and the high efficiency in data transmission, and is flexible and easy to realize the reliable operation of a communication system.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.

Claims (5)

1.一种窄带物联网无线链路协议子层AM实体数据传输自适应方法，其特征在于包括如下步骤：1. a narrowband Internet of Things wireless link protocol sublayer AM entity data transmission adaptive method is characterized in that comprising the steps: 步骤1，AM接收实体获取当前发送的状态报告NACK数量n；Step 1, the AM receiving entity obtains the number n of status report NACKs currently sent; 步骤2，AM接收实体根据NACK数量n、重排序定时器t_reordering和系统允许最大传输时延计算并更新状态禁止定时器t_StatusProhibit参数的值；Step 2, the AM receiving entity calculates and updates the value of the status prohibition timer t_StatusProhibit parameter according to the NACK number n, the reordering timer t_reordering and the maximum transmission delay allowed by the system; 所述状态禁止定时器t_StatusProhibit参数的计算方法为：The calculation method of the state prohibition timer t_StatusProhibit parameter is:
Figure FDA0002774009700000011
Figure FDA0002774009700000011
 其中，t_Maxdelay表示系统允许最大传输时延；Among them, t_Maxdelay represents the maximum transmission delay allowed by the system; 步骤3，AM传输实体根据滑动窗长度、信道传输速率s和轮询重传定时器t_PollRetransmit计算触发轮询的阀值，并与当前的发送缓存器中PDU的个数作比较，若PDU的个数大于或等于触发轮询的阀值，则触发轮询；Step 3, the AM transmission entity calculates the threshold for triggering polling according to the sliding window length, the channel transmission rate s and the polling retransmission timer t_PollRetransmit, and compares it with the number of PDUs in the current transmit buffer. If the number is greater than or equal to the threshold for triggering polling, polling is triggered; 所述触发轮询的阀值的计算方法为：The calculation method of the threshold value for triggering polling is:
Figure FDA0002774009700000012
Figure FDA0002774009700000012
 其中，Threshold表示触发轮询的阀值，AM_WindowLength表示AM传输实体的发送滑动窗的大小，t_PDU表示传输实体发送一个PDU所需时间。Among them, Threshold represents the threshold for triggering polling, AM_WindowLength represents the size of the sending sliding window of the AM transmission entity, and t_PDU represents the time required for the transmission entity to send one PDU. 2.如权利要求1所述的窄带物联网无线链路协议子层AM实体数据传输自适应方法，其特征在于：所述步骤2包括如下具体步骤：2. the narrowband Internet of Things wireless link protocol sublayer AM entity data transmission adaptive method as claimed in claim 1, is characterized in that: described step 2 comprises the following concrete steps: 步骤21，根据NACK数量n、重排序定时器t_reordering和系统允许最大传输时延t_Maxdelay，计算状态禁止定时器t_StatusProhibit的值；Step 21: Calculate the value of the status prohibition timer t_StatusProhibit according to the NACK number n, the reordering timer t_reordering and the maximum transmission delay t_Maxdelay allowed by the system; 步骤22，根据t_StatusProhibit的值更新AM接收实体参数t_StatusProhibit；Step 22, update the AM receiving entity parameter t_StatusProhibit according to the value of t_StatusProhibit; 步骤23，将更新后的t_StatusProhibit参数用于数据传输，同时判断是否有新的状态报告生成，若有新的状态报告生成，则返回步骤21，若没有新的状态报告生成，则重复步骤23。Step 23: Use the updated t_StatusProhibit parameter for data transmission, and judge whether a new status report is generated. If a new status report is generated, return to step 21. If no new status report is generated, repeat step 23. 3.如权利要求1所述的窄带物联网无线链路协议子层AM实体数据传输自适应方法，其特征在于：所述步骤3包括如下具体步骤：3. The narrowband Internet of Things wireless link protocol sublayer AM entity data transmission adaptive method as claimed in claim 1, wherein the step 3 comprises the following concrete steps: 步骤31，根据信道传输速率s结合当前发送的PDU的长度，计算PDU在物理信道传输所需时间t_TransPDU；Step 31, according to the channel transmission rate s combined with the length of the currently sent PDU, calculate the time t_TransPDU required for PDU transmission in the physical channel; 步骤32，根据t_TransPDU和RLC层与物理层之间传输时间，预估传输实体发送一个PDU所需时间t_PDU；Step 32, according to t_TransPDU and the transmission time between the RLC layer and the physical layer, estimate the time t_PDU required by the transmission entity to send a PDU; 步骤33，根据AM传输实体的发送滑动窗的大小、轮询重传定时器t_PollRetransmit和计算的t_PDU计算轮询阀值Threshold；Step 33, calculate the polling threshold Threshold according to the size of the transmission sliding window of the AM transmission entity, the polling retransmission timer t_PollRetransmit and the calculated t_PDU; 步骤34，比较当前发送滑动窗缓存器内的PDU数量与轮询阀值Threshold的大小，从而确定是否触发轮询。Step 34: Compare the number of PDUs in the current sending sliding window buffer with the size of the polling threshold Threshold, so as to determine whether to trigger polling. 4.如权利要求3所述的窄带物联网无线链路协议子层AM实体数据传输自适应方法，其特征在于：所述步骤32中，根据信道传输速率s、当前PDU长度PDU_Length和数据在RLC层与物理层之间传输时间ts，利用t_PDU＝PDU_Length*s+2ts预估传输实体发送一个PDU所需时间t_PDU。4. The narrowband Internet of Things wireless link protocol sublayer AM entity data transmission adaptive method as claimed in claim 3, characterized in that: in the step 32, according to the channel transmission rate s, the current PDU length PDU_Length and the data in the RLC For the transmission time ts between the layer and the physical layer, t_PDU=PDU_Length* s +2ts is used to estimate the time t_PDU required by the transmission entity to send one PDU. 5.如权利要求3所述的窄带物联网无线链路协议子层AM实体数据传输自适应方法，其特征在于：所述步骤34中，若发送滑动窗的缓存器中的PDU的个数大于或等于轮询阀值Threshold，则进行轮询操作，并启动轮询重传定时器t_PollRetransmit等待AM接收实体传输状态报告，若发送滑动窗的缓存器中的PDU的个数小于轮询阀值Threshold，则重复步骤34。5. the narrowband Internet of Things wireless link protocol sublayer AM entity data transmission adaptive method as claimed in claim 3, is characterized in that: in described step 34, if the number of the PDU in the buffer of the transmission sliding window is greater than or equal to the polling threshold Threshold, the polling operation is performed, and the polling retransmission timer t_PollRetransmit is started to wait for the AM to receive the entity transmission status report. If the number of PDUs in the buffer for sending the sliding window is less than the polling threshold Threshold , repeat step 34.
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