CN100584063C - An energy-saving method applied in GSM base station - Google Patents

Abstract

This invention relates to a new type of energy-saving method used in the base stations of GSM mobile communication system, which can realize functions of measurement of service volume, decision of service transfer plans, transfer implement and closing vacant service units to save energy of base stations and increase usability of electric energy.

Description

A method of energy saving applied to GSM base station

technical field

The present invention relates to an energy-saving method for a base station in a mobile communication system, in particular to a central base station with multiple processing units and a relatively large capacity. A new module is added to the existing business processing flow to form a new energy-saving subsystem , so that the base station can automatically and timely adjust the number of processing units participating in the operation according to the business load, so as to achieve the purpose of saving energy.

Background technique

The equipment of the GSM system can be divided into switching subsystem SSS, also known as network subsystem, base station subsystem BSS, mobile station and operation maintenance subsystem OSS four subsystem equipment. In the operating cost of mobile communication operators, the power consumed by the base station subsystem accounts for a large part. If this part of expenditure can be effectively reduced, it will greatly save operating costs and achieve the purpose of saving energy consumption.

The base station subsystem BSS is mainly responsible for the system functions related to wireless and transmission in the GSM system. Such as providing management of wireless resources, providing the switching subsystem with the allocation, establishment and release of wireless channels corresponding to land wired channels, providing mobile users with a method of accessing the network through limited wireless resources, and controlling mobile users to cross areas Switch management and other functions.

Experimental data shows that the business load of the base station system is different in each hour of 24 hours a day, and the difference between the business volume at the highest peak and the lowest time can be as much as ten times, but even in the time period with the least traffic, the current The base station system is also running at full power, and part of the power is wasted. If the base station can automatically adjust the number of processing units participating in the operation according to the traffic volume, and turn off unnecessary processing units during the low traffic period, it can save energy. purpose of electricity.

The base station subsystem mainly consists of two functional entities, the base station controller BSC and the base transceiver station BTS.

The functions realized by the base station controller mainly include:

Terrestrial channel management, manages and controls the A interface and Abis interface, and implements channel allocation between BSC-BTS (including physical channels and logical channels). Since there is a one-to-one correspondence between the wireless channel and the terrestrial channel allocation of the Abis interface, the BSC is also responsible for the channel allocation on the wireless interface.

Wireless channel management, implement the management of the wireless channel structure (that is, the combination of logical channels, the mapping of physical channels, etc.), allocate dedicated channels to users, control the power of radio frequency channels, etc.

Responsible for three handovers: intra-cell handover within the BSC, inter-cell handover within the BSC, and service handover between BSCs.

Operation and maintenance functions, including measurement of services and observation of a mobile station. The BSC controls the triggering of these observations and measurements, takes samples, collects data, creates files and transmits files to the Operation and Maintenance Center OMC-B.

Support cell division or expansion, increase or decrease part or all of the equipment of the base station transceiver station, increase or decrease wireless terrestrial channels, etc.

The base transceiver station mainly has the function of dealing with the wireless connection of the base station subsystem. include:

Complete the mapping of logical channels to physical channels (including channel combination, etc.).

Detection of mobile station random access and handoff access.

Encoding/decoding of wireless channels, channel modulation and demodulation, interleaving and deinterleaving, data encryption and decryption, TDMA frame establishment, frequency hopping and other functions.

Handles the operation and maintenance functions of each part of its equipment.

When the mobile station changes from idle mode to dedicated mode and initiates an access request to the base station, the reason may be one of the following:

1. Perform cell location update.

2. Respond to the page.

3. Establish a call, including additional service requests, and send short message requests.

Regardless of the reason, the mobile station sends a channel access request to the base station. After the base transceiver station detects the request, it is handed over to the base station controller to allocate a channel to the mobile station and establish a connection, so that the mobile station can communicate. business.

The channel request and allocation process is shown in Figure 1.

The handover process occurs when the network designates the channel for the mobile station to access other cells. There are various reasons for the handover, but the handover decision rests with the base station controller. Once the new cell is selected, the mobile station must coordinate transmissions with the management entities of the old cell and the new cell. The processing always consists of two main processes:

(1) The base station controller first triggers a series of events to establish a possible path. Once the path is established, a handover instruction is sent to the mobile station.

(2) The mobile station accesses the new channel according to the instruction, and triggers the network to switch the path and release the original path.

The switching execution process is shown in Figure 2.

The so-called switching point can be the original BSC, the new BSC or other units, depending on the type of handover. The switching point is responsible for establishing the necessary wired and wireless resources to the new BSC. The handovers involved in the present invention are handovers between BTSs within the BSC, so the switching point is the original BSC.

Regardless of the type of handover, when the switching point receives the handover completion message, it starts to release the original path and radio resources in some appropriate way.

Contents of the invention

The purpose of the present invention is to enable the base station of the mobile communication system to concentrate services according to the real-time changes of the service volume, close idle service processing units, and save energy consumption. The present invention is an energy-saving method applied to a base station of a mobile communication system. The means of realization is to design a new traffic adaptive system based on the original business processing flow of the base station. Adjust the number of functional modules participating in the operation, so as to avoid the idling of some modules during the business downturn, and improve the efficiency of power usage without affecting the quality of service.

The functions and characteristics of the system are described as follows:

a. It can continuously monitor, measure and analyze the business load of the base station controlled by the program.

b. Based on the analysis of business volume, a solution for business concentration and transfer can be formed.

c. According to the above solution, the business can be transferred, and unnecessary business processing units can be shut down, so as to achieve the purpose of saving electric energy.

In order to realize the object of the present invention, the technical scheme that the present invention takes is: a kind of traffic adaptive method based on base station load, it is characterized in that, comprises the following steps:

a. Program parameters are set by the operator at the operation and maintenance center, including system start-up mode, start-up time, frequency of traffic measurement of wireless transceiver stations, time of handing in traffic reports of base station controllers, etc.;

b. After the system is started, the base station controller sends a command download request to the operation and maintenance center, and after the operation and maintenance center confirms, it sends the operator's setting command to the base station controller;

c. After receiving the order, the base station controller executes it. On the one hand, it configures its own submission report format according to the command instruction; Upload the business volume report to the operation and maintenance center;

d. At the frequency time point specified by the operation and maintenance center, the base station controller issues a service measurement command to the wireless transceiver station. After receiving the command, the wireless transceiver station executes it, scans the occupancy of all its channels, and Report the occupancy of each channel and the size of the load to the base station controller, and attach the scan completion flag;

e. After receiving the scanning result data of the wireless transceiver station, the base station controller forms a traffic measurement report to be submitted to the operation and maintenance center according to the preset specifications, and sends an application for submitting the report to the operation and maintenance center;

f. After the operation and maintenance center receives the application for submitting the report from the base station controller, it approves and accepts the report data. The core decision-making module analyzes the report data and makes a decision. After seeing the decision algorithm, the operation and maintenance center issues the decision order to the base station controller;

g. After the base station controller receives the decision order, execute it, first transfer the business on the source wireless transceiver station to the destination wireless transceiver station, and then turn on or off the idle wireless transceiver station;

h. After the wireless transceiver station receives the command from the base station controller, it performs intra-cell handover for the services involved in the command, and the power module turns on or off the wireless transceiver station involved in the command;

i. The wireless transceiver station returns the execution result of the command to the base station controller; a traffic adaptive adjustment cycle ends.

The system structure for realizing the above method is composed of three unit modules, namely the wireless transceiver station (BTS), the base station controller (BSC), and the operation and maintenance center (OMC-B) shown in FIG. 3 . The interface and communication protocol modules between them also belong to the system. The wireless transceiver station is the direct bearer of the service. In an ordinary base station, there are often multiple wireless transceiver stations processing the service at the same time. In this system, each wireless transceiver station can be switched from on to off and off to on by the power control module embedded in it to accept the instructions of the base station controller. The built-in function of the wireless transceiver station ensures that it can measure the use of all its channels at each moment. On this basis, the communication module 1 based on the Abis interface between the wireless transceiver station and the base station controller can complete Report to the base station controller the channel occupancy of the wireless transceiver station at a specified time. After the base station controller receives the report, the communication module 2 based on the A interface between the base station controller and the operation and maintenance center uploads the report to the operation and maintenance center. In the operation and maintenance center, the decision-making module analyzes the received reports to form a centralized business transfer plan, which is sent back to the base station controller by the communication module 2 . The execution module of the base station controller analyzes the report and translates it into actions that can be executed by itself, including handover, closing or opening a certain wireless transceiver station, etc. Finally, the wireless transceiver station executes the action command of the base station controller to complete a self-adaptive adjustment operation of traffic. The system diagram is shown in Figure 4.

The above is one of the modules of the above-mentioned system that realizes a traffic adaptive method based on base station load - the operation and maintenance center, whose function is to rely on the software package running on it to command the wireless transceiver station, and the base station controller to complete the control Detect and report the traffic, make decisions, and issue relevant commands to the base station controller to achieve control of the wireless transceiver station. At its heart lies the software package as a decision-making module.

The software package running on the operation and maintenance center provides a man-machine interface (MMI) that can be used by the operator. The operator can adjust the subsystem by changing the parameters of the software.

Through the man-machine interface interface, the operator can

a. Turn on or off the energy-saving subsystem, or realize the timing switch through programming.

b. Set the time interval for scanning the business load of the wireless transceiver station and the time when the base station controller submits the report, and freely configure the indicators and report forms contained in the report based on the realization of the wireless transceiver station.

c. Realize the setting of the service volume threshold according to actual needs.

d. Manually carry out the handover of the mobile station on the current wireless transceiver station to realize the allocation, establishment and release of physical and logical channels.

e. Shut down any wireless transceiver station manually and keep the interface module, or restart the wireless transceiver station through the interface module.

f. Query the service report of each hour in the latest period, so as to make manual analysis on the change of the base station business volume.

In addition to the human-machine interface interface, the software package can also complete the following functions:

a. Timing switch or timing monitoring can be realized according to the program setting.

b. After the subsystem is started, it responds to the download request of the base station controller, and transmits the set service scanning frequency, report sending frequency, report format and required indicators to the base station controller.

c. Receive the traffic monitoring report sent by the base station controller within the agreed time period.

d. Store the business reports received every hour for the operator to review and delete the reports before a certain length of time to save space.

e. Analyze the traffic monitoring report sent by the base station controller and judge whether to take action to turn off or turn on certain wireless transceiver stations according to the set algorithm.

f. Issue commands to the base station controller, including:

(1) New physical and logical channel allocation scheme.

(2) A centralized solution for existing services, specifying the wireless transceiver stations that need to transfer the services and the wireless transceiver stations that receive the transferred services.

(3) The number of wireless transceiver stations that need to be activated.

The algorithm of the software is as follows:

The main index to measure the service volume is the channel occupancy rate, that is, the ratio of the number of channels currently participating in service processing to the total number of channels.

set up:

The number of channels carried by each wireless transceiver station is n,

The base station has B wireless transceiver stations in total, and correspondingly, the total number of channels of the base station is nB,

The number of channels currently in the business processing state is t,

The number of radios currently on is b,

The channel margin is defined as a (0<a<n), that is, if there are currently x channels in the business processing state, then x+a channels should be opened in the next cycle to prepare for random access of mobile stations.

The wireless transceiver station that should be turned on in the next cycle is NEXT,

NEXT＝[(t+a)/n]+1 If NEXT＞B, take NEXT＝B

If NEXT>b, it means that in the past cycle, the business volume showed an upward trend, and new wireless transceiver stations should be opened to increase the number of channels;

If NEXT=b, no action is taken;

If NEXT<b, it means that the business volume in the last cycle showed a decreasing trend, and unnecessary wireless transceiver stations should be turned off to save power.

The shutdown procedure is as follows:

Give the number of 1~b as the weight to the currently opened wireless transceiver stations, the one with the largest business load is b, and the one with the lightest load is 1. If they are the same, randomly choose one and give it a larger weight.

Then the wireless transceiver stations No. 1~(b-NEXT) will be closed. According to the number from low to high, the business on it is transferred to the reserved wireless transceiver station and closed.

In order to realize the above-mentioned traffic self-adaptive method based on base station load, the feature of the system is that the base station controller acts as the central nervous system of the whole subsystem, the bridge for communication between the wireless transceiver station and the operation and maintenance center, and analyzes the operation and maintenance center The order is implemented on the wireless transceiver station; and the business status of the wireless transceiver station is regularly monitored and reported to the operation and maintenance center. The base station controller is also characterized in that:

After the subsystem is started, the scanning time period and frequency set by the operator, as well as various indicators and forms included in the report are downloaded from the operation and maintenance center through the communication module 2 .

Regularly scan the business load of the wireless transceiver station according to the preset frequency, issue commands to the wireless transceiver station and receive the returned data, form a report, and summarize the reports within each hour.

At a preset time point, the report of this period is submitted to the software at the operation and maintenance center end.

Receive manual operation commands transmitted by the operation and maintenance center, including: manually shutting down or opening a certain wireless transceiver station, manually switching over a certain channel, etc.

After receiving the action command sent by the operation and maintenance center, the base station controller may perform the following operations:

a. A command to turn on a specified number of wireless transceiver stations is communicated to the wireless transceiver stations through the communication module 1 .

b. Receive the new physical and logical channel allocation scheme given by the software, and implement it on the specific wireless transceiver station, determine the service to be transferred and a pair of wireless transceiver stations to perform the operation.

c. Implementing handoffs between radio transceiver station cells for selected traffic to be transferred.

d. Turn off certain designated wireless transceiver stations.

The above-mentioned system is also characterized in that the power control module that controls the wireless transceiver station to be turned on or off is characterized in that:

The main control module of the power supply in the dominant position accepts the commands from the base station controller and transmits them to the secondary power supply control modules for execution.

Each secondary power supply control module subordinate to the main power supply control module, each secondary power supply control module controls the opening or closing of a corresponding wireless transceiver station.

The main control module of the power supply communicates with the base station controller through the communication module 1, and accepts commands from the base station controller.

The present invention is also characterized by a handover control module capable of controlling service handover between wireless transceiver stations, characterized in that:

Communicate with the base station controller through the communication module 1, and accept the handover command conveyed by the base station controller.

It is possible to transfer a specified service from a specified source wireless transceiver station to a destination wireless transceiver station.

The present invention is also characterized in that, as the object wireless transceiver station finally regulated by the energy-saving method, it is characterized in that:

The opening or closing of each wireless transceiver station is controlled by its corresponding secondary power supply control module.

Control commands from the base station controller can be executed, including:

-Scan and report commands for business load and other indicators.

- The base station controller completes the planned handover command.

- Implement the new physical and logical channel allocation plan completed by the operation and maintenance center.

The feature of the present invention is also based on the communication module 1 of the Abis interface standard between the wireless transceiver station and the base station controller, characterized in that:

Provide a communication interface for the base station controller and the power control module, so that the power control command can be executed smoothly.

Provide communication interface for base station controller and handover control module.

Communicate the channel scanning command of the base station controller and collect the scanning results of the channel occupancy of each wireless transceiver station, and upload them to the base station controller.

The method of the invention can effectively improve the use efficiency of the electric energy of the base station and save the electric energy expenditure of the base station.

Description of drawings:

The performance characteristics of the present invention are further described by the following examples and accompanying drawings.

Fig. 1 is a schematic diagram of the channel request and allocation process in the communication process.

Fig. 2 is a schematic diagram of a communication service handover process.

Figure 3 is the structure of the base station system.

Fig. 4 is a composition diagram of the service adaptive system.

Figure 5 is a composition diagram of the wireless transceiver station.

Fig. 6 is a composition diagram of the base station controller.

Detailed ways:

The invention is an energy-saving method applied to a base station of a mobile communication system. By dynamically adjusting the number of wireless transceiver stations participating in business processing in real time, the utilization efficiency of electric energy is improved, and the purpose of saving power consumption and reducing operating costs is achieved.

The traffic adaptive system is composed of a power supply control module, a handover control module, a service status report module, a command analysis and execution module, a decision module, a communication module 1, and a communication module 2.

The power control module is composed of two levels, the main control module and the secondary control module. The main control module connects all the secondary control modules and the command parsing and execution module to execute power management commands. The secondary control module is directly connected with the wireless transceiver station, and can control the opening or closing of the wireless transceiver station.

The handover control module coordinates the transfer and distribution of services between all wireless transceiver stations, is connected with the command analysis and execution module, and accepts its switching instructions to transfer services from one wireless transceiver station to another.

The business status report module is located in the base station controller, connected to the communication module 1, receives the channel occupancy status report uploaded regularly by it, sorts it out according to the requirements of the decision-making module, and then submits it to the decision-making module.

The command analysis and execution module is also located in the base station controller, and is connected with the decision-making module, the service status reporting module, the handover control module and the power supply control module. In each cycle of business self-adaptive adjustment, the command analysis and execution module first receives the business transfer and allocation solution made by the decision-making module, analyzes it, extracts the relevant parameter standards of the business report and passes it to the business status report module for supply It determines report specifications, submission frequency and other parameters. The business transfer and power management commands are parsed into executable forms of the handover control module and the power control module, and passed to them for execution.

The decision-making module is located in the operation and maintenance center, and it is a software package running on it. Its core algorithm is as mentioned above. In addition, the decision-making module provides a man-machine interface for the operator to use.

The communication module 1 connects the wireless transceiver station and the base station controller, and provides communication interfaces for the modules at both ends. The command analysis and execution module communicates commands with the handover control module and the power supply control module through the communication module 1 . The business status reporting module regularly collects the channel occupancy status of each wireless transceiver station through the communication module 1 .

The communication module 2 is located between the base station controller and the operation and maintenance center, provides an uplink communication interface for the decision-making module and the business status reporting module, and provides a downlink communication interface for the decision-making module and the command analysis and execution module.

Claims (1)

1, a kind of power-economizing method that is applied to the GSM base station is characterized in that the method includes the steps of:

A. hold the setting program parameter by the operator in operation maintenance center, comprise the system start-up mode, start-up time, wireless receiving and dispatching letter platform measuring business volume frequency, the report of base station controller traffic carrying capacity is submitted the time;

B. after the system start-up, base station controller sends the instruction download request to operation maintenance center, and operation maintenance center after confirming assigns operator's the order that is provided with to base station controller;

C. after base station controller is received order, carried out, according to the reporting format of submitting of order indication configuration self, according to the frequency of regulation in the order wireless receiving and dispatching letter platform is carried out traffic measurement on the other hand, and on official hour, the traffic carrying capacity report is uploaded to operation maintenance center on the one hand;

D. on the frequency time point of operation maintenance center's appointment, base station controller is assigned the traffic measurement order to wireless receiving and dispatching letter platform, after wireless receiving and dispatching letter platform receives orders, carried out, own all channel occupancy situations are scanned, and whether each channel occupancy is reached payload report to base station controller, and additional scanning complement mark;

E. after base station controller receives the scanning result data of wireless receiving and dispatching letter platform, according to the specification of prior setting form will on give the measuring business volume report of operation maintenance center, and send the delivery report application to operation maintenance center;

F. after the delivery report application of operation maintenance center's As-received station control, approved and accepted report data, the decision-making module that is positioned at operation maintenance center is analyzed report data, and makes a policy according to the following steps, and operation maintenance center will make a strategic decision to order again and assign to base station controller;

F (1). agreement: each wireless receiving and dispatching letter channel quantity that platform carried is n; Described base station total B wireless receiving and dispatching letter platform, correspondingly, the total channel quantity in this base station is nB; The current channel quantity that is in the business processing status is t; The current wireless receiving and dispatching letter platform quantity that is in opening is b; The definition channel margin is that (0＜a＜n), that is, if the current x of a having channel is in business processing status, then following one-period should be opened the at random access of x+a channel in order to travelling carriage to a; The wireless receiving and dispatching letter platform that following one-period should open is NEXT; NEXT=[(t+a)/n]+1, if NEXT＞B then gets NEXT=B;

F (2). if NEXT＞b, then order is opened new wireless receiving and dispatching letter platform to increase channel quantity;

F (3). if NEXT=b does not then take any action;

F (4). if NEXT＜b, then order is closed unwanted wireless receiving and dispatching letter platform to save electric energy; Wherein closing closed procedure is: the numbering of giving 1～b for the wireless receiving and dispatching of current unlatching letter platform is as weight, and traffic load the maximum is b, and the lighter is 1, as identical person, then gets one at random to compose with bigger weight; 1～(b-NEXT) number wireless receiving and dispatching letter platform will be closed; By numbering from low to high, successively the business on it is transferred to the wireless receiving and dispatching letter platform of reservation and it is closed;

G. after base station controller is received the decision-making order, carried out, at first send open command to the power supply secondary control module that links to each other with wireless receiving and dispatching letter platform by the main power control module, then the source wireless receiving and dispatching letter platform and the purpose wireless receiving and dispatching of the selected business that will shift are believed that platform sends the handoff command between the sub-district, send shutdown command by the main power control module to the power supply secondary control module that links to each other with wireless receiving and dispatching letter platform at last;

H. after the open command that the power supply secondary control module As-received station control that described and wireless receiving and dispatching letter platform links to each other sends by the main power control module, power supply secondary control module is carried out open operation to the wireless receiving and dispatching letter platform that relates in the open command, after described source wireless receiving and dispatching letter platform and purpose wireless receiving and dispatching letter platform are received handoff command between the sub-district, source wireless receiving and dispatching letter platform and purpose wireless receiving and dispatching letter platform are to the handoff operation between the business execution sub-district that relates in the handoff command between the sub-district, after the shutdown command that the power supply secondary control module As-received station control that described and wireless receiving and dispatching letter platform links to each other sends by the main power control module, the wireless receiving and dispatching letter platform execution shutoff operation of power supply secondary control module to relating in the shutdown command;

I. described wireless receiving and dispatching letter platform returns to base station controller with command execution results; One time the traffic carrying capacity self adaptation is regulated loop ends.

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