CN112995936B

CN112995936B - 230MHz and 1800MHz power wireless private network fusion networking method and system

Info

Publication number: CN112995936B
Application number: CN202110268635.XA
Authority: CN
Inventors: 戴勇; 刘锐; 李伟; 严宇航; 汪大洋; 江淞; 樊进; 李洋; 张立武; 龚亮亮
Original assignee: Nari Information and Communication Technology Co; Information and Telecommunication Branch of State Grid Jiangsu Electric Power Co Ltd
Current assignee: Nari Information and Communication Technology Co; Information and Telecommunication Branch of State Grid Jiangsu Electric Power Co Ltd
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2022-10-04
Anticipated expiration: 2041-03-12
Also published as: CN112995936A

Abstract

The invention discloses a 230MHz and 1800MHz electric wireless private network fusion networking method and system, comprising: an access control separation manager arranged at a core network side MME, and an access controller and a transmission control separation manager arranged at an S/PGW (gateway containing both an SGW and a PGW); the access control separation manager is used for respectively sending the acquired S1-MME control data sent by the 230MHz base station and the 1800MHz base station to different MME protocol stacks or MME signaling controllers; the access controller is used for selecting a corresponding user data protocol according to an instruction of the MME signaling controller at the MME; and the transmission control separation manager is used for sending the S1-U user data to a related protocol stack according to the user data protocol selected by the access controller so as to complete transmission. The invention provides a method and a system for integrating the power wireless private networks LTE230 and LTE1800 to form a network, which realize the integration of a core network, use two special control separators and effectively combine the respective advantages of the two independent networks.

Description

230MHz and 1800MHz power wireless private network fusion networking method and system

Technical Field

The invention relates to a 230MHz and 1800MHz electric wireless private network fusion networking method and system, belonging to the technical field of electric wireless private networks.

Background

The wide application of the wireless private network in the power system provides a convenient access mode collection, mobile operation and video monitoring for the interaction of control services (such as distribution automation and power supply-power grid-load-energy storage interaction) and management services (such as power consumption information). The electric wireless private network (electric wireless private network) inherits the advantages of flexible networking, convenient construction and maturity of the wireless network. Moreover, their special use of frequency bands, devices and networks avoids the limitations of wireless public networks in terms of bandwidth, delay, service interruption rate, security and reliability. In addition, the method can effectively supplement a wired transmission network, effectively solve the problem of 'last mile' access of power communication, and open the 'nerve endings' of an energy Internet of things network, and has incomparable advantages compared with the traditional wired communication and wireless technologies. In addition, distributed photovoltaics, electric vehicle charging piles and other services will experience explosive growth with the replacement of clean energy and electricity and the deep advance of energy innovation. Therefore, the interaction mode of power supply, power grid, load and energy storage changes, and the control and sensing capability of the power distribution network and the quasi-real-time acquisition capability of low-voltage power need to be comprehensively improved so as to promote the qualitative leap of the operation level and the service mode of the power grid. The power wireless private network is an important technology for realizing service access and collection at the end of a power grid. At present, the domestic frequency spectrum resources in China are scarce, and the main frequency band is occupied by various services. The available frequency bands of the power wireless private network are 10MHz continuous frequency (1800 MHz frequency band for short) in 1785 MHz-1805 MHz and 7MHz discontinuous frequency (230 MHz frequency band for short) in 223 MHz-235 MHz. Research and development of power wireless private network related products are carried out in the industry on the basis of 3GPP LTE standards on 2 frequency bands. However, since there are other sporadic applications in the 1800MHz band, the use in the power wireless private network can be authorized only after the frequency is cleared. There are two independent power wireless private network systems in these two frequency bands: LTE1800, which is similar to a common LTE network, and LTE230, which is also similar to an LTE system but with different subcarrier spacing. Each having advantages and disadvantages, it is preferable to use both systems simultaneously. This may improve reliability and coverage according to current research. However, since two separate core networks are required, a large amount of hardware may be required, resulting in increased costs. How to effectively integrate the two private networks is critical.

Disclosure of Invention

The invention aims to solve the technical problem of how to effectively integrate 230MHz and 1800MHz power wireless private networks, and provides a 230MHz and 1800MHz power wireless private network fusion networking method and system so as to realize the advantage that the two independent systems can be reserved in the aspects of capacity and coverage.

In order to achieve the technical purpose, the invention adopts the following technical scheme.

On one hand, the invention provides a 230MHz and 1800MHz electric wireless private network fusion networking method, which comprises the following steps:

respectively sending the acquired S1-MME control data sent by the 230MHz base station and the 1800MHz base station to different MME protocol stacks or MME signaling controllers;

selecting a corresponding user data protocol according to an instruction of an MME signaling controller at an MME;

the S1-U user data is sent to the relevant protocol stack according to the selected user data protocol to complete the transmission.

Further, an MME accessed is selected according to the weight information of the MME, and the load among MMEs in an MME pool is balanced, wherein the specific method comprises the following steps: setting the weight of each MME and adjusting the updating period of the weight of the MME.

Further, the method for setting the weight of each MME includes: setting an attachable user number self-proportion, an attachable user number total proportion, an activatable bearer number self-proportion and an activatable bearer total proportion, and carrying out weighted summation on the set parameters to obtain the weight of each MME, wherein

The self-proportion of the attachable users represents the proportion of the number of the users which can be attached to the MME currently to the total number of the attachable users of the MME;

the total attachable user number proportion represents the proportion of the number of the currently attachable users of the MME to the total number of the attachable users in the whole MME pool;

the activatable bearer number self-proportion indicates the proportion of the currently activatable bearer number of the designated MME to the total activatable bearer number of the MME;

and the total activated bearer proportion represents the proportion of the number of the bearers which can be activated by the MME currently to the total number of the activatable bearers in the whole MME pool.

Further, the method for adjusting the MME weight update period specifically includes:

(1) When the MME just starts to be put into the pool for operation, initializing the time period of an MME weight updating timer to be T;

(2) After a first timer time period T, the MME counts the number A1 of the users increased in the period, and then starts the timer again and waits for the expiration of the timer;

(3) When the time period T of the second timer is reached, the MME counts the number A2 of the users increased in the period, compares the value of A2 with the value of A1, and then adjusts the value of the time period T of the next timer according to the change condition, wherein the adjusting method comprises the following steps:

when A2 is equal to A1, keeping the time period T of the original timer unchanged;

when A2 is larger than A1, accelerating the frequency of the MME weight notification according to a set numerical value;

when A2 is smaller than A1, slowing down the frequency of MME weight notification according to a set value;

(4) Resetting and starting the weight updating timer according to the time period T adjusted in the step 3;

(5) The MME continues to operate according to the methods of the step (3) and the step (4), when the Nth timer time period T is reached, the MME counts the increased number A of the users in the period _N Comparison A _N The value is equal to the number A of user increases in the last period _N-1 And (4) adjusting the value of the time period T of the next timer according to the adjusting method in the step (3) according to the changing condition until the MME reaches the overload stateThe algorithm flow is bundled.

Further, the method further comprises determining a network of the 230MHz and 1800MHz power wireless private networks of the device that is optimal for the device based on the detected signal quality.

In a second aspect, the present invention further provides a 230MHz and 1800MHz power wireless private network convergence networking system, which is characterized in that the system includes: an access control separation manager arranged at a core network side MME, and an access controller and a transmission control separation manager arranged at an SDW and a PGW;

the access control separation manager is used for respectively sending the acquired S1-MME control data sent by the 230MHz base station and the 1800MHz base station to different MME protocol stacks or MME signaling controllers;

the access controller is used for selecting a corresponding user data protocol according to an instruction of the MME signaling controller at the MME;

and the transmission control separation manager is used for sending the S1-U user data to a related protocol stack according to the user data protocol selected by the access controller so as to complete transmission.

Further, the access control detach manager is further configured to: selecting an accessed MME according to MM weight information, and balancing loads among MMEs in an MM pool, wherein the method specifically comprises the following steps: setting the weight of each MME and adjusting the updating period of the weight of the MME.

Furthermore, a multi-network fusion controller is arranged at the equipment access position; the multi-network fusion controller is used for determining the best network for the equipment in the 230MHz and 1800MHz electric power wireless private networks according to the detected signal quality, and the multi-network fusion controller is not responsible for the transmission of the data link.

Still further, the multi-network convergence controller is also used for identifying accessible cells of the device and estimating cell load.

Still further, the multi-network convergence controller is configured to determine a network in the 230MHz and 1800MHz wireless private network for the device that is optimal for the device according to the detected signal quality, cell load rate, and power service type, and the multi-network convergence controller is not responsible for transmission of a data link.

The invention has the following beneficial technical effects:

the invention provides a method and a system for integrating the power wireless private network LTE230 and the power wireless private network LTE1800 into a network, which realize the integration of a core network, use two special control separators and effectively combine the respective advantages of the two independent networks; meanwhile, the method completes the fusion method of the access network; meanwhile, a multi-network fusion controller is integrated in an access network so as to select a proper network according to the channel quality, the cell load rate, the service class and the like. The data transmission rate of the integrated network system is obviously improved, and the reliability and the coverage range of the network are improved.

Drawings

Fig. 1 is a schematic diagram of a core network structure of a power wireless private network convergence networking system according to an embodiment;

FIG. 2 is a schematic flow chart of a method for controlling MME load balancing according to an embodiment;

FIG. 3 is an integrated schematic diagram of an access network and a multi-network convergence controller according to an embodiment;

fig. 4 is a schematic diagram of a cell or module selection process of a multi-network convergence controller in an embodiment.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

For a better understanding of the present invention, the noun explanations are given below:

MME: mobility Management Entity. The MME is a signaling entity, and is mainly responsible for functions such as mobility management, bearer management, authentication and authentication of a user, and selection of an S/PGW, and specifically includes: support NAS (non access stratum) signaling and its security, management of Tracking Area (TA) lists, selection of S/PGWs, selection of MMEs when handing over MME, authentication of users, roaming control and bearer management, mobility management between core network nodes of different access networks of 3GPP (terminating at S3 node), and UE reachability management in ECM _ IDLE state (including control and execution of paging retransmissions).

S/PGW: due to the characteristic that the core network is constructed in a scattered mode, the MME, the SGW and the PGW are deployed in a scattered mode, and the PGW does not need to be deployed in a further scattered mode relative to the SGW, so that the PGW and the SGW are combined to form the S/PGW, and the SGW and the PGW which are independent of each other do not exist in the electric power wireless private network.

SGW: serving GW, serving gateway. The method is mainly responsible for user plane processing, routing and forwarding functions of data packets and the like, supports switching of different access technologies of 3GPP, and is used as an anchor point of a user plane when switching occurs; for each UE associated with an EPS, at one point in time, there is one SGW serving it.

PGW: PDN (Packet Data Network) Gateway, packet Data Gateway. The anchor point is an anchor point of a user plane data link between the LTE network and the user data network, is responsible for managing data routing of the LTE network and the user data network, and is also responsible for functions such as DHCP, strategy execution, charging and the like; if the UE accesses a plurality of user data networks, the method is realized by a single PGW in the electric wireless private network.

HSS: and the Home Subscriber Server stores the subscription service information of all users, including IMSI, IMEI, authentication vector, service information, service quality and the like.

PCRF: policy and Charging Rules Function, PCRF is a Policy and Charging control Policy decision point for traffic data flow and IP bearer resources, and selects and provides available Policy and Charging control decisions for PCEF (Policy and Charging enforcement Function).

IP (Internet Protocol) service, network Protocol service.

Example 1: a 230MHz and 1800MHz power wireless private network convergence networking system, as shown in fig. 1, the core network integrated controller includes an S1-MME access controller, an SI-U access controller, and further includes: an access control separation manager arranged at the core network side MME, and an access controller and a transmission control separation manager arranged at the S/PGW.

In a specific embodiment, the access control separation manager is further configured to: and selecting the accessed MME according to the MM weight information, and balancing the load among MMEs in the MM pool.

The general idea is as follows: (1) The MME function is realized by LTE230 and LTE1800 core networks, the MME of the LTE230 and the MME of the LTE1800 form an MME pool, and the access control separation manager performs load balancing control. The S/PGW adopts an independent protocol stack, forms a resource pool and is scheduled by a transmission control separation manager.

(2) The S/PGW is added with an access controller for distinguishing different User Equipment (UE) categories and executing different protocol stack branch processing, and the protocol of the S/PGW is selected according to the instruction of an MME signaling controller at the MME

(3) Different modes of access equipment and base stations are identified and distinguished during access. Separate logical branches are used to handle different modes of equipment and base stations. Control signals of different modes are sent to different protocol stacks through the transmission control separation manager.

(4) With the help of a transmission control separation manager in the integrated S/PGW, uplink and downlink traffic data is sent to the relevant protocol stacks to complete the transmission.

The access control separation manager at the MME employs a load balancing algorithm based on MME weights. Since the parameters for measuring the load capacity of the MME device are also changing continuously with the operation of the MME device, the factors involved in the evaluation are appropriately adjusted, which is summarized as follows:

the self-proportion of the attachable users represents the proportion of the number of the users that can be attached to the MME currently to the total number of the attachable users of the MME. With V representing an ad hoc proportion of the number of attachable users,

and the total attachable user number proportion represents the proportion of the number of the users which can be currently attached to the MME to the total attachable user number in the whole MME pool. The total proportion of the number of attachable users is represented by X,

the activated bearer number self-proportion represents the proportion of the number of currently activated bearers of the designated MME to the total number of the activated bearers of the MME. The activatable loading number self-ratio is represented by Y,

and the total activated bearer proportion represents the proportion of the number of the bearers which can be activated by the MME currently to the total number of the activatable bearers in the whole MME pool. The total activatable load bearing ratio is represented by Z,

the weight Q of each MME can be calculated by

Q＝0.088V+0.272X+0.157Y+0.483Z。

The weighting coefficients of the parameters are not limited to the values set in the embodiment, and those skilled in the art can set the weighting coefficients according to specific application scenarios, which is not limited in the present invention.

The main idea of adjusting the MME weight update period is: after the time period T is passed each time, the MME counts the number of the users increased in the time period; if the number of the users increased in the time period is larger than the number of the users increased in the last time period, the time period of the next weight updating is properly shortened; if the number of the users increased in the time period is smaller than the number of the users increased in the previous time period, the time period of the next weight updating is properly prolonged; if the number of users increased in the time period is basically unchanged relative to the number of users increased in the previous time period, the original time period is kept unchanged. The specific process is as follows:

(1) And when the MME just starts to be put into the pool for operation, initializing the time period of an MME weight updating timer to be T.

(2) After a first timer time period T, the MME counts the number A1 of users added in the period, and then starts the timer again and waits for the timer to expire.

(3) When the time period T of the second timer is reached, the MME counts the number A2 of the users increased in the period, compares the value of A2 with the value of A1, and then properly adjusts the value of the time period T of the next timer according to the change condition, wherein the adjusting method comprises the following steps:

when A2 is equal to A1, it means that the rate of increasing the number of users on the MME in the current time period is consistent with the previous period, so the original timer time period T is kept unchanged.

When A2 is greater than A1, it indicates that the rate of increase of the number of MME users in the current time period is greater than the previous period, so the timer time period T needs to be shortened, and the frequency of MME weight notification needs to be appropriately increased.

When A2 is smaller than A1, it indicates that the rate of increase of the number of MME users in the current time period is smaller than the previous period, so the timer time period T can be extended, and the frequency of MME weight notification is appropriately slowed down.

The MME weight update's time period value has an upper bound T _MAX And a lower limit T _MIN When the T value reaches the upper limit, the T value is not increased any more, and when the T value reaches the lower limit, the T value is not decreased any more.

(4) And resetting and starting the weight updating timer according to the adjusted time period T in the step 3.

(5) The MME continues to operate according to the methods of the step 3 and the step 4When the Nth timer time period T is reached, the MME counts the number A of the users increased in the period _N Comparison A _N Value and A _N-1 And (4) adjusting the value of the time period T of the next timer according to the change condition, and ending the algorithm flow until the MME reaches the overload state.

The algorithm flow is shown in fig. 2.

The specific method for adjusting the timer period T is to make a judgment according to the following calculation result k.

The adjustment strategy for the timer period is shown in table 1 below in relation to k.

TABLE 1 adjustment strategy for timer time period versus k

In this embodiment, as shown in fig. 3, on the basis of not changing existing LTE230 and LTE1800 devices, a multi-network convergence controller may be used to help a device select a suitable network for communication. The advantage of using a separate controller is that it does not need to be connected to the original equipment. The multi-network fusion controller only selects equipment and is not responsible for transmission of a data link, and the design concept of control-transmission separation is also met. The integrated controller also has the function of simplifying signal reception and detection, mainly identifying available networks and estimating signal quality, and only receiving downlink synchronization signals, control signals and broadcast signals. The network mode is then selected based on the actual circumstances of the power traffic. The multi-network fusion controller can detect the signal quality in real time or periodically and make the best network judgment in real time. Fig. 4 illustrates the device-side mode selection process. The main functions and procedures of the access network integrated controller are described as follows:

(1) Accessible cell identification

In order to detect and identify the heterogeneous power wireless private network, it is necessary to extract characteristic information that can distinguish the network. Since LTE230 and LTE1800 are both based on LTE technology, the cell ID detected by PSS and SSS methods can be used as the characteristic information. Whether these two modes are present or accessible depends on whether the device can correctly decode the information on the Physical Broadcast Channel (PBCH). If the relevant PBCH can be decoded, this mode is indicated to exist and vice versa. Another function of decoding the PBCH is to collect access information, such as bandwidth, control channel information, etc., accessible to the network to estimate a load rate of an associated cell and detect channel quality.

(2) Channel quality detection

In order to select a suitable network for access, the signal strength of the different networks must be estimated, and parameters such as Received Signal Strength Indicator (RSSI) and SNR can be estimated from PSS, SSS and PBCH. The estimated channel quality may be used as one of the measurement bases for mode selection.

(3) Cell load rate estimation

After detecting the PSS, SSS, and PBCH for the corresponding pattern, the integrated controller may infer physical resources of a Physical Downlink Control Channel (PDCCH). The detection of the number of PDCCHs is used as an indicator of the current network load rate and may be used to describe how busy the network is and to be selected as one of the bases for mode selection.

(4) Mode selection

Mode selection or network selection is an integrated trade-off process; factors to be considered include channel quality, cell loading rate, and power traffic type. The selection of the switching threshold is very important when channel quality is taken as a measurement criterion. We can choose the threshold value by simulation or practical experience. When the cell load rate is taken as the measurement standard, it is necessary to consider different load balancing algorithms, such as polling method, hashing method, etc. When power traffic type is used as the measurement standard, it is necessary to use LTE230 as a backup and the system selects LTE1800 as the preferred access network by default. When narrowband traffic is transmitted, communication may be actively fallback to LTE 230.

Example 2: corresponding to the 230MHz and 1800MHz power wireless private network convergence networking system provided in the above embodiment, the embodiment provides a 230MHz and 1800MHz power wireless private network convergence networking method, including: respectively sending the acquired S1-MME control data sent by the 230MHz base station and the 1800MHz base station to different MME protocol stacks or MME signaling controllers;

It is clear to those skilled in the art that, for convenience and brevity of description, the corresponding processes in the method embodiments may refer to the specific working processes of the foregoing systems, apparatuses and units, which are not described herein again.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A230 MHz and 1800MHz electric power wireless private network fusion networking method, characterized by comprising:

setting the weight of each MME and adjusting the updating period of the weight of the MME, selecting the accessed MME according to the weight information of the MME, and balancing the load among the MMEs in an MME pool, wherein the MME of LTE230 and the MME of LTE1800 form the MME pool;

2. The 230MHz and 1800MHz power wireless private network convergence networking method according to claim 1, wherein the method for setting the weight of each MME comprises: setting an attachable user number self-proportion, an attachable user number total proportion, an activatable bearer number self-proportion and an activatable bearer total proportion, and carrying out weighted summation on the set parameters to obtain the weight of each MME, wherein

The attachable user number self-proportion represents the proportion of the number of users that the MME can be attached to currently to the total number of attachable users of the MME;

and the total activated bearer proportion represents the proportion of the number of the bearers which can be activated currently by the MME to the total number of the activatable bearers in the whole MME pool.

3. The 230MHz and 1800MHz power wireless private network convergence networking method according to claim 1, wherein the method for adjusting the MME weight update period specifically includes:

(4) Resetting and starting the weight updating timer according to the adjusted time period T in the step 3;

(5) The MME continues to operate according to the methods of the step (3) and the step (4), when the Nth timer time period T is reached, the MME counts the increased number A of the users in the period _N Comparison A _N The value is equal to the number A of user increases in the last period _N-1 And (4) adjusting the value of the time period T of the next timer according to the adjusting method in the step (3) according to the changing condition until the MME is finished when the MME reaches the overload state.

4. The method for the 230MHz and 1800MHz power wireless private network convergence networking according to claim 1, wherein the method further comprises determining a best network for the device in the 230MHz and 1800MHz power wireless private networks according to the detected signal quality.

5. The utility model provides a 230MHz and 1800MHz electric power wireless private network integration network deployment system which characterized in that includes: an access control separation manager arranged at a core network side MME, and an access controller and a transmission control separation manager arranged at an S/PGW;

the access controller is used for selecting a corresponding user data protocol according to an instruction of an MME signaling controller at an MME;

the transmission control separation manager is used for sending the S1-U user data to a related protocol stack according to the user data protocol selected by the access controller so as to complete transmission;

the access control detach manager is further to: selecting an accessed MME according to MME weight information, and balancing loads among MMEs in an MME pool, wherein the method specifically comprises the following steps: and setting the weight of each MME and adjusting the updating period of the weight of the MME, wherein the MME of the LTE230 and the MME of the LTE1800 form an MME pool.

6. The system according to claim 5, wherein a multi-network convergence controller is provided at the device access point; the multi-network fusion controller is used for determining the best network for the equipment in the 230MHz and 1800MHz electric power wireless private networks according to the detected signal quality, and the multi-network fusion controller is not responsible for the transmission of the data link.

7. The system of claim 6, wherein the multi-network convergence controller is further configured to identify cells accessible to the device and estimate cell load.

8. The system according to claim 6, wherein the multi-network convergence controller is configured to determine a network of the 230MHz and 1800MHz wireless private networks that is optimal for the device according to the detected signal quality, cell loading rate, and power service type, and the multi-network convergence controller is not responsible for transmission of data links.