CN111132176B - High concurrency resistant NB-IOT network communication method and system - Google Patents
High concurrency resistant NB-IOT network communication method and system Download PDFInfo
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- CN111132176B CN111132176B CN201911396792.8A CN201911396792A CN111132176B CN 111132176 B CN111132176 B CN 111132176B CN 201911396792 A CN201911396792 A CN 201911396792A CN 111132176 B CN111132176 B CN 111132176B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Abstract
A method and a system for high concurrency resistant NB-IOT network communication, wherein the method comprises the following steps: acquiring a control instruction; sending a paging message according to the control instruction; completing capacity optimization of a paging channel according to the paging signal; receiving the paging message through the paging channel with optimized capacity and executing the control instruction according to the paging message; according to the technical scheme, through optimizing and improving the paging channel capacity and optimizing the base station access capacity, the concurrent instruction issuing success rate is greatly improved, the problems of time delay and packet loss caused by issuing instructions by a large number of clients at the same time are solved, meanwhile, the hardware investment is not required to be increased, a large amount of cost is saved, and the method is further popularized to the NB-IOT downlink high concurrency application scene, the standardization and normalization of NB-IOT network communication are accelerated, and the method can be widely applied to the technical field of the Internet of things.
Description
Technical Field
The application relates to the technical field of the Internet of things, in particular to a high concurrency resistant NB-IOT network communication method and system.
Background
Term interpretation:
NB-IOT (Narrow Band Internet of Things): the narrow-band Internet of things and the Internet of everything are an important branch. NB-IOT focuses on the low power wide coverage (LPWA) Internet of things (IOT) market, which is an emerging technology that can be widely used worldwide. The method has the characteristics of wide coverage, multiple connections, low speed, low cost, low power consumption and the like.
High concurrency in downlink: aiming at a downlink control service scene, when a plurality of users use the service simultaneously at the same time, a command is issued simultaneously, and network side congestion and other conditions can occur.
NB-IOT is an emerging technology, IOT, which supports cellular data connectivity of low power devices over a wide area network, also known as a Low Power Wide Area Network (LPWAN). NB-IOT implementations communicate with things and things communicate with humans. NB-IoT is built on cellular networks with a bandwidth of 180KHz, focusing mainly on small data size, low rate applications. The characteristics of the NB-IOT network determine that the network is suitable for reporting services with smaller data packets and longer reporting periods. However, with the development of the NB-IOT internet of things service, man-machine interaction scene applications represented by intelligent home appliances, such as applications of shared washing machines, shared air conditioners and the like, have no fixed issuing time, and a large number of users may issue instructions at a certain moment at the same time, so that the NB-IOT internet of things service has large impact on a network and is easy to generate time delay and even packet loss.
The prior technical proposal can only carry out discrete processing on the terminal side aiming at NB reporting service to reduce network load; for the novel man-machine interaction scene, the network can be expanded only by adding methods such as base stations, adding software and hardware investment such as carrier waves and the like, so that the load problem is solved; on the premise of not increasing the cost of software and hardware, no good optimization method is available for solving the time delay and packet loss caused by downlink high concurrency.
Disclosure of Invention
In order to solve the technical problems, the application aims to: the method and the system for communication of the high concurrency resistant NB-IOT network are free from increasing the cost of software and hardware, standardization and standardization.
The first technical scheme adopted by the application is as follows:
a high concurrency resistant NB-IOT network communication method comprises the following steps: acquiring a control instruction; sending a paging message according to the control instruction; completing capacity optimization of a paging channel according to the paging signal; and receiving the paging message through the paging channel with optimized capacity and executing the control instruction according to the paging message.
Further, the high concurrency resistant NB-IOT network communication method further comprises the following steps: generating a response signal according to the control instruction; establishing a radio bearer for returning the response signal, and completing access capacity optimization of the radio bearer; and finishing the back transmission of the response signal through the radio bearer with optimized capacity.
Further, the capacity optimization of the paging channel includes paging resource allocation optimization and balancing modulation and coding strategies.
Further, the access capacity optimization includes: optimizing a physical random access channel of the radio bearer; and suppressing the unreal access of the optimized physical random access channel to finish virtual access optimization.
Further, the access capacity optimization further comprises: adjusting the coverage level of the base station; and reducing the congestion of the access channel by a dynamic compensation mechanism of the base station after the coverage level is adjusted.
Further, the step of optimizing the paging resource allocation specifically includes: completing reservation of air interface resources according to the first paging message; dynamically adjusting allocation of paging capacity in the air interface resource according to the non-first paging message; and directly issuing the cached paging message according to the adjusted paging capacity.
Further, the optimizing the physical random access channel of the radio bearer specifically includes: the capacity of the physical random access channel is improved by reducing the period of the physical random access channel; by setting the frequency domains of different physical random access channels, interference on the frequency domains is suppressed.
The second technical scheme provided by the application can correspond to a system for realizing the first technical scheme of the application, and the system specifically comprises the following components:
an anti-high concurrency NB-IOT network communication system, comprising:
the user server is used for generating a control instruction and receiving a control instruction response;
the core network is used for generating paging information according to the control instruction and issuing the paging information to the base station, and simultaneously, the core network is used for finishing data interaction with the user server and the base station;
the base station is used for completing paging capacity optimization according to the paging signal and sending paging information to the terminal equipment, and is also used for completing data interaction with the core network;
and the terminal equipment is used for receiving the paging message, executing the control instruction, performing data interaction with the base station, generating a response of the control instruction and sending the response to the base station.
Further, the core network and the base station send the paging message to the terminal equipment through the paging channel.
Further, the terminal equipment completes data interaction with the base station through the radio bearer, and sends the control instruction response to the base station.
The beneficial effects of the application are as follows: according to the technical scheme, through optimizing and improving the paging channel capacity and optimizing the base station access capacity, the concurrent instruction issuing success rate is greatly improved, the problems of time delay and packet loss caused by issuing a large number of clients at the same time are solved, meanwhile, the hardware investment is not required to be increased, a large amount of cost is saved, and the method is further popularized to the NB-IOT downlink high concurrency application scene, and the standardization and standardization of NB-IOT network communication are accelerated.
Drawings
FIG. 1 is a flow chart of steps of a method for high concurrency resistant NB-IOT network communication according to the present application;
FIG. 2 is a schematic diagram of a paging priority allocation method in an embodiment of a high concurrency resistant NB-IOT network communication method according to the present application;
FIG. 3 is a bar graph of the paging loss rate after a paging priority allocation method is adopted in an embodiment of a high concurrency resistant NB-IOT network communication method according to the present application;
FIG. 4 is a histogram of message reception and message reception failure times after completing virtual connection optimization according to an embodiment of the present application;
FIG. 5 is a bar graph of terminal concurrency success rate for an embodiment of an anti-high concurrency NB-IOT network communication method of the present application;
fig. 6 is a schematic diagram of an overall structure of an anti-high concurrency NB-IOT network communication system according to the present application.
Detailed Description
The present application will be described in further detail with reference to specific examples. The step numbers in the following embodiments are set for convenience of illustration only, and the order between the steps is not limited in any way, and the execution order of the steps in the embodiments may be adaptively adjusted according to the understanding of those skilled in the art.
Referring to fig. 1, a method for high concurrency resistant NB-IOT network communication includes the steps of:
s01, acquiring a control instruction; specifically, the user server forms a corresponding control instruction according to specific requirements, and further uploads the control instruction to the core network.
S02, sending a paging message according to the control instruction; specifically, in a high concurrency scenario, after a large number of control instructions are issued, the core network further issues the signaling to the base station, and the base station pages the NB terminal.
S03, completing capacity optimization of a paging channel according to the paging signal; specifically, the capacity optimization of the paging channel is completed in two directions according to the embodiment, which includes:
s031, paging resource allocation optimization; the Paging priority allocation algorithm guarantees the Paging issue according to the Paging priority allocation algorithm, and the specific implementation manner of the Paging priority allocation algorithm refers to fig. 2, when the core network issues the Paging message to the base station for the first time, the base station caches the Paging message and reserves air interface resources, when the core network issues the Paging message to the base station again, which means that the Paging message is more at the moment, in order to avoid delaying the issue to the next Paging occasion (Paging timing), the base station caches the Paging message and dynamically adjusts the allocation of Paging capacity in time, so as to improve the Paging resources of the air interface, and then when the preset Paging occasion arrives, the cached Paging messages are directly sent to the terminal on the Paging resources adjusted before. Referring to fig. 3, after the paging resource allocation is optimized according to the present embodiment, the paging dropping rate is obviously improved.
In this embodiment, the paging occasion factor parameter configuration is dynamically adjusted according to the actual paging load. According to the network load of the high concurrency scenario, the default paging occasion factor parameter nB (the number of paging occasions included in one paging cycle) is set to 1/16T (one paging occasion per 16 radio frames), the greater the paging occasion factor nB is set, the greater the paging capacity per unit time is, when nb=t, the base station can page 1600 terminals per second, and when nb=1/16T, the base station can page 100 terminals per second. However, the paging narrowband physical downlink control channel NPDCCH and the narrowband physical downlink shared channel NPDSCH are multiplexed in the time domain, and since the NB-IOT system has only one physical layer resource block RB, paging resource collision occurs when the paging occasion factor NB is configured too much, in order to balance access resources and paging resources, the default paging occasion factor parameter NB in this embodiment is set to 1/16T, and is dynamically adjusted according to the actual paging load.
S032, balancing paging codes, reducing the codes of paging MCS (modulation and coding strategy), and enhancing the paging receiving capability of the terminal; the base station cannot acquire the signal coverage level of the terminal at the paging issuing time, the MCS modulation and coding strategy used for paging can be set to 0-15 level, the lower the level is, the more the used signal coding mode is, the stronger the anti-interference capability is, and the terminal can ensure the normal receiving of the paging message, so that the MCS level is required to be reduced in order to ensure the success rate of the paging message receiving, for example, BPSK modulation is adopted when MCS=0, and the signal receiving capability is strongest. However, the smaller the MCS set, the lower the coding mode will result in the smaller number of carried messages, which is detrimental to paging capacity. Under the high concurrency scene, MCS=1 is selected for balance capacity and access capacity (7 TMSI pages are supported at maximum by an air interface), so that the paging message decoding capacity of the terminal can be improved, and meanwhile, certain paging capacity is considered.
S04, receiving the paging message through the paging channel with optimized capacity and executing the control instruction according to the paging message; specifically, the terminal device receives the paging message and executes corresponding actions according to the content of the control instruction, and the base station establishes wireless connection to perform data interaction and complete control instruction response.
Optionally, the implementation further includes the following steps:
s05, generating a response signal according to the control instruction;
s06, establishing a radio bearer for returning the response signal, and completing access capacity optimization of the radio bearer; specifically, when the paging message arrives at the terminal, the terminal initiates random access to the base station to establish a radio bearer to complete communication. At this time, access resources need to be guaranteed to improve the success rate of the terminal accessing the network, and in this embodiment, the access capacity of the base station is optimized by the following aspects:
s061, optimizing the PRACH of the radio bearer, including by reducing the period of the PRACH and by setting the frequency domain of different PRACHs; specifically, in this embodiment, the period of the access signal PRACH is set to 160ms, and the smaller the period of the access channel PRACH is, the more access resources are available; meanwhile, the PRACH frequency domains of the same coverage cells are staggered, and access failure caused by interference on the frequency domains is reduced.
S062, adjusting the coverage level of the base station; specifically, the NB-IOT classifies the network into coverage classes 0-2 according to the signal quality of the network in different areas, wherein the coverage class 0 indicates that the signal quality is the best, and the coverage class 2 indicates that the signal quality is the worst. The NB-IOT network can receive the message in the environment with bad signal through a large number of retransmissions to support the terminal under the coverage level 2. However, in a high concurrency scenario, network resources are very tense, communication is performed under coverage level 2, retransmission times are too many, so that a large amount of resources are wasted, other users covering level 0 and level 1 are blocked from performing services, and high time delay is also caused. Therefore, the configuration of coverage level 2 can be canceled, so that the network capacity is improved, and the use quality of most terminals is ensured.
S063, reducing the congestion of the access channel through a dynamic compensation mechanism of the base station after adjusting the coverage level; specifically, access congestion is reduced through a dynamic BackOff mechanism of the base station, and the success rate of terminal access is improved. In the prior art, a base station adopts a control mechanism of static BackOff back-off, so that the access collision probability of a terminal is reduced. For example, when the terminal listens to the air-interface RAR message and finds that there is a BackOff indicator value (BI) in the RAR of the MAC PDU, the terminal will save this value, and then when the terminal initiates random access again, the terminal will randomly select a value from 0 to BI as the starting time for retransmitting the preamble sequence (i.e. deciding when to retransmit MSG1 again). Compared with the static backhaul, the BI value of the dynamic backhaul is designed to be related to the network load, when the load in the current area is higher, the BI value becomes larger, and a failed terminal can randomly initiate access in a longer time window, so that collision on PRACH can be better avoided, the increase of the channel load in the current area is avoided, and the success rate of terminal access is improved.
S064, suppressing the unreal access of the optimized physical random access channel, and completing virtual access optimization. Due to the self design of the PRACH channel in the NB-IoT protocol, the same-frequency neighbor PRACH or PUSCH (physical uplink shared channel) is easy to cause interference to the cell, and PRACH virtual detection is caused. Because the access is not real, a great amount of waste of access resources is caused, so that insufficient resources are more tense, and the resource scheduling of a real user is influenced. Through virtual connection optimization processing: determining a first frequency domain resource allocated by PRACH based on PRACH configuration information; determining a second frequency domain resource of Physical Uplink Shared Channel (PUSCH) scheduling which needs to be scheduled in an Uplink (UL) subframe; when the interval distance between the first frequency domain resource and the second frequency domain resource is smaller than a set threshold, calculating the signal-to-noise ratio SINR on the RB corresponding to the second frequency domain resource; and comparing the SINR with a preset threshold value of the PRACH virtual detection, and adjusting a virtual detection suppression threshold value of the virtual detection of the first frequency domain resource and the second frequency domain resource according to a comparison result, so that occupation of virtual detection access to resources can be effectively reduced, and resource waste is avoided. Referring to fig. 4, the columns 1-4 are test cases without starting the virtual detection optimization function, the MSG1 message is a message of initiating access for the first time by the terminal in the random access flow, the MSG3 message is a message of initiating to the network for the second time after the terminal receives the network response, and because a large number of MSGs 1 which are not actually initiated access exist, the network side cannot recognize, a large number of MSGs 3 fail to be generated, which indicates that a random access channel has a large number of non-real accesses; by starting the virtual detection interference suppression function in the embodiment, as shown by a column 5, the unreal access of the physical random access channel is suppressed, the number of MSG1 is greatly reduced, and the number of MSG3 failures is also greatly reduced, namely the number of virtual accesses is greatly reduced, so that a large amount of network channel resources are saved.
Referring to fig. 5, after the capacity optimization of the paging channel and the access capacity optimization of the radio bearers of the base station and the equipment terminal in this embodiment, the high concurrency scenario test is performed under a single base station, and the success rate of the 400 users issuing the instructions is increased from 26% before the optimization to 84% after the optimization, so that the use requirement of the clients in the high concurrency scenario can be satisfied.
S07, finishing the return of the response signal through the radio bearer after capacity optimization.
Referring to fig. 6, another embodiment of the present application provides a high concurrency resistant NB-IOT network communication system for implementing the first embodiment of the present disclosure, a high concurrency resistant NB-IOT network communication method, including:
the user server is used for generating a control instruction and receiving a control instruction response;
the core network is used for generating paging information according to the control instruction and issuing the paging information to the base station, and simultaneously, the core network is used for finishing data interaction with the user server and the base station;
the base station is used for completing paging capacity optimization according to the paging signal and sending paging information to the terminal equipment, and is also used for completing data interaction with the core network;
and the terminal equipment is used for receiving the paging message, executing the control instruction, performing data interaction with the base station, generating a response of the control instruction and sending the response to the base station.
In this embodiment, the core network and the base station send a paging message to the terminal device through a paging channel; and the terminal equipment completes data interaction with the base station through a wireless bearer and sends the control instruction response to the base station.
Specifically, after the client trigger command is issued, the core network pages the terminal device of the NB, so that the priority of the paging message needs to be ensured, and the following steps are executed: step 1, aiming at a paging model, opening a paging priority allocation algorithm to ensure paging issue, and balancing access resources and paging resources, wherein nB parameters are adjusted to 1/16; and 2, optimizing paging codes, reducing paging MCS codes and enhancing paging receiving capability of the terminal according to the paging resource allocation in the step 1. Mcs=1 is selected based on high concurrency scenario analysis and balancing capacity with access capability. And 3, on the basis of ensuring the accessibility of paging in the step 2, optimizing the methods such as the PRACH period improving PRACH capacity and the preferential matching of paging by staggering the PRACH frequency domain of the same coverage cell, and improving the accessed PRACH resources by inhibiting virtual detection interference. And 4, further optimizing the coverage level on the basis of the step 3, starting a base station dynamic backhaul off mechanism, reducing user blocking, and ensuring that the user can smoothly access the NB network to complete uplink and downlink interaction after receiving downlink paging.
In summary, compared with the prior art, the method and the system for anti-high concurrency NB-IOT network communication have the following advantages:
1) The technical scheme of the application greatly improves the success rate of issuing concurrent instructions by optimizing and improving the capacity of paging channels and optimizing the access capacity of the base station, and solves the problems of time delay and packet loss caused by issuing instructions by a large number of clients at the same moment;
2) The technical scheme of the application does not need to increase hardware investment, saves a great amount of cost, is further popularized to the NB-IOT downlink high concurrency application scene, and accelerates the standardization and normalization of NB-IOT network communication.
In the foregoing description of the present specification, reference has been made to the terms "one embodiment/example", "another embodiment/example", "certain embodiments/examples", and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (5)
1. The high concurrency resistant NB-IOT network communication method is characterized by comprising the following steps:
acquiring a control instruction;
sending a paging message according to the control instruction;
completing capacity optimization of a paging channel according to the paging message;
receiving the paging message through the paging channel with optimized capacity and executing the control instruction according to the paging message;
generating a response signal according to the control instruction;
establishing a radio bearer for returning the response signal, and completing access capacity optimization of the radio bearer;
the back transmission of the response signal is completed through the radio bearer with optimized capacity;
the capacity optimization of the paging channel comprises paging resource allocation optimization and balancing modulation and coding strategies;
the paging resource allocation optimization comprises the following steps:
completing reservation of air interface resources according to the first paging message;
dynamically adjusting allocation of paging capacity in the air interface resource according to the non-first paging message;
directly issuing the cached paging message according to the adjusted paging capacity;
wherein the access capacity optimization comprises:
optimizing a physical random access channel of the radio bearer;
suppressing the unreal access of the optimized physical random access channel to finish virtual access optimization;
the optimizing the physical random access channel of the radio bearer includes:
by reducing the period of the physical random access channel and by setting the frequency domain of a different physical random access channel.
2. The method of claim 1, wherein the access capacity optimization further comprises:
adjusting the coverage level of the base station;
and reducing the congestion of the access channel by a dynamic compensation mechanism of the base station after the coverage level is adjusted.
3. The method for high concurrency resistant NB-IOT network communication according to claim 1, wherein the optimizing the physical random access channel of the radio bearer specifically comprises:
the capacity of the physical random access channel is improved by reducing the period of the physical random access channel;
by setting the frequency domains of different physical random access channels, interference on the frequency domains is suppressed.
4. An anti-high concurrency NB-IOT network communication system, comprising:
the user server is used for generating a control instruction and receiving a control instruction response;
the core network is used for generating paging information according to the control instruction and issuing the paging information to the base station, and simultaneously, the core network is used for finishing data interaction with the user server and the base station;
the base station is used for completing paging capacity optimization according to the paging message and sending the paging message to the terminal equipment, and is also used for completing data interaction with the core network;
the paging capacity optimization comprises paging resource allocation optimization and balancing modulation and coding strategies;
the paging resource allocation optimization comprises the following steps:
completing reservation of air interface resources according to the first paging message;
dynamically adjusting allocation of paging capacity in the air interface resource according to the non-first paging message;
directly issuing the cached paging message according to the adjusted paging capacity;
the terminal equipment is used for receiving the paging message, executing the control instruction, performing data interaction with the base station, generating a response of the control instruction and sending the response to the base station;
the terminal device is configured to generate a response of the control instruction and send the response to the base station, and includes:
generating a response signal according to the control instruction;
establishing a radio bearer for returning the response signal, and completing access capacity optimization of the radio bearer;
the back transmission of the response signal is completed through the radio bearer with optimized capacity;
wherein the access capacity optimization comprises:
optimizing a physical random access channel of the radio bearer;
suppressing the unreal access of the optimized physical random access channel to finish virtual access optimization;
the optimizing the physical random access channel of the radio bearer includes:
by reducing the period of the physical random access channel and by setting the frequency domain of a different physical random access channel.
5. The high concurrency resistant NB-IOT network communication system according to claim 4, wherein the core network and base station send paging messages to the terminal device over a paging channel.
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