WO2012163230A1 - 用于小区重选的方法、基站收发器、基站控制器及系统 - Google Patents

用于小区重选的方法、基站收发器、基站控制器及系统 Download PDF

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Publication number
WO2012163230A1
WO2012163230A1 PCT/CN2012/075770 CN2012075770W WO2012163230A1 WO 2012163230 A1 WO2012163230 A1 WO 2012163230A1 CN 2012075770 W CN2012075770 W CN 2012075770W WO 2012163230 A1 WO2012163230 A1 WO 2012163230A1
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Prior art keywords
value
message
physical quantity
specific physical
base station
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PCT/CN2012/075770
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English (en)
French (fr)
Inventor
赵旸
罗超
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华为技术有限公司
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Publication of WO2012163230A1 publication Critical patent/WO2012163230A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

Definitions

  • the present invention relates to the field of communications and, more particularly, to a method for cell reselection in a communication field, a base transceiver station, a base station controller, and a system therefor.
  • GSM Global System for Mobile communications
  • BCCH Broadcast Control Channel
  • other carrier frequencies of the GSM base station can generally be dynamically changed according to the size of the traffic.
  • the carrier frequency and/or time slot are turned off to achieve energy saving.
  • all time slots of the BCCH carrier frequency must always be in a full power transmission state to ensure the user terminal's measurement of neighboring cells and subsequent mobility management procedures such as reselection and handover, the BCCH carrier frequency becomes GSM base station energy saving. A bottleneck.
  • the transmission power of the BCCH carrier frequency can be reduced in some GSM base station products, this will affect the performance of the network, so that the coverage of the GSM base station is reduced, and the processes of cell selection, reselection, and handover are negatively affected. And because the BCCH carrier frequency is still on, the energy saving effect is limited.
  • the base station controller (BSC) counts the cell. If the traffic in a cell continues to go down during a preset time period, the traffic in the cell is switched to other cells as much as possible, and the BCCH carrier frequency and other service carrier frequencies of the cell are directly closed. Thereby closing the cell.
  • the user terminal in the idle state may perform cell reselection due to the sudden decrease of the BCCH carrier frequency signal strength due to camping on the BCCH carrier frequency, so that multiple user terminals in the idle state are simultaneously the same.
  • the base station of the target cell sends a signaling requesting access, which will cause a signaling storm for the reselected target cell, causing signaling congestion, thereby affecting network performance.
  • the embodiments of the present invention provide a method for a cell reselection, a base station transceiver, a base station controller, and a system thereof, which can avoid signaling storms caused by multiple cell terminals simultaneously performing cell reselection, so that the user terminal reselects to the neighboring cell. It does not cause signaling congestion, which improves network performance.
  • the embodiment of the present invention provides a method for cell reselection, including: receiving, from a base station controller, a message indicating a value of a specific physical quantity, where the specific physical quantity is used to indicate a user terminal in an idle state in a cell. Selecting a target cell, where the value of the specific physical quantity indicated by the message is different at different times; changing the value of the specific physical quantity according to the value of the specific physical quantity indicated in the message, so that the cell is in the cell The user terminal in the idle state selects the neighboring cell in batches according to the value of the specific physical quantity. .
  • an embodiment of the present invention provides a method for cell reselection, including: generating a message indicating a value of a specific physical quantity, where the specific physical quantity is used to indicate that a user terminal in an idle state in a cell selects a target cell.
  • the value of the specific physical quantity indicated by the message is different; at different times, the message is sent to the base transceiver station, so that the base station transceiver according to the specific physical quantity indicated in the message
  • the value changes the value of the specific physical quantity, so that the user terminal in the idle state in the cell selects the neighboring cell in batches according to the value of the specific physical quantity.
  • the embodiment of the present invention provides a base transceiver station, including: a first receiving module, configured to receive, from a base station controller, a message indicating a value of a specific physical quantity, where the specific physical quantity is used to indicate that the cell is idle.
  • the user terminal in the state selects the target cell, where, at different times, the The value of the specific physical quantity indicated by the message received by the receiving module is different; the changing module is configured to change the value of the specific physical quantity according to the value of the specific physical quantity indicated in the message, so that the cell is located in the cell
  • the user terminal in the idle state selects the neighboring cell in batches according to the value of the specific physical quantity.
  • an embodiment of the present invention provides a base station controller, including: a generating module, configured to generate a message indicating a value of a specific physical quantity, where the specific physical quantity is used to indicate that a user terminal in an idle state in the cell selects a target a cell, where, at different times, the value of the specific physical quantity indicated by the message generated by the generating module is different; the first sending module is configured to send the message to the base transceiver station at different times, so that the The base station transceiver changes the value of the specific physical quantity according to the value of the specific physical quantity indicated by the message, so that the user terminal in the idle state in the cell selects the neighboring cell in batches according to the value of the specific physical quantity.
  • an embodiment of the present invention provides a system for cell reselection, including a base station controller and a base transceiver station.
  • the base station controller is configured to generate a message indicating a value of a specific physical quantity, where the specific physical quantity is used to indicate that a user terminal in an idle state in the cell selects a target cell, where the base station controller generates The value of the specific physical quantity indicated by the message is different;
  • the base station controller is further configured to send the message to the base station transceiver;
  • the base station transceiver is configured to receive from the base station controller at different times
  • the base station transceiver is further configured to change a value of the specific physical quantity according to a value of a specific physical quantity indicated in the message, so that a user terminal in an idle state in the cell is according to the specific physical quantity.
  • the values are selected in batches to neighbor cells.
  • the user terminal in the idle state can be selected to the neighboring cell in batches based on the value of the specific physical quantity that is gradually changed. Therefore, a large number of user terminals can be effectively prevented from performing cell reselection at the same time, which effectively prevents the occurrence of signaling storms and signaling congestion, so that network performance does not decrease due to the occurrence of a signaling storm, thereby improving network performance.
  • FIG. 1 is a flow chart of a method for cell reselection in accordance with an embodiment of the present invention.
  • FIG. 2 is a flow chart of another method for cell reselection in accordance with an embodiment of the present invention.
  • FIG. 3 is a flow chart of still another method for cell reselection in accordance with an embodiment of the present invention.
  • FIG. 4 is a flow chart of still another method for cell reselection in accordance with an embodiment of the present invention.
  • FIG. 5 is a structural block diagram of a base transceiver station according to an embodiment of the present invention.
  • FIG. 6 is a block diagram showing the structure of another base transceiver station according to an embodiment of the present invention.
  • FIG. 7 is a structural block diagram of a base station controller according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram of another base station controller according to an embodiment of the present invention.
  • FIG. 9 is a structural block diagram of a system for cell reselection according to an embodiment of the present invention. detailed description
  • Figure 1 is a flow diagram of a method 100 for cell reselection in accordance with an embodiment of the present invention.
  • the method 100 includes: at S110, receiving, by the base station controller, at least two messages indicating a value of a specific physical quantity, where the specific physical quantity is used to indicate that the user terminal in the idle state selects the target cell; The value of the specific physical quantity is changed according to the value of the specific physical quantity indicated by each of the at least two messages, so that the value of the specific physical quantity reaches the value of the specific physical quantity indicated by each message at different times, so that the value is The user terminal in the idle state of the cell selects the neighboring cell in batches according to the value of the specific physical quantity.
  • method 100 can be performed by a Base Transceiver Station (BTS).
  • BTS Base Transceiver Station
  • BSC Base Station Controller
  • the BTS and BSC may be in the same device or in different devices.
  • a BTS is controlled by one BSC, but one BSC can control multiple BTSs.
  • the BTS receives at least two messages from the BSC, each of which indicates a value of a particular physical quantity.
  • the specific physical quantity may be the transmission power of the BCCH carrier frequency, or may be the minimum access level, and may be other specific physical quantities that the user terminal can use to perform cell selection as can be imagined by those skilled in the art.
  • the user terminal in the idle state can determine whether it still resides in the current cell or selects a new cell.
  • the BTS can periodically receive at least two messages from the BSC, and the receiving time interval can be fixed or not, and the total number of received messages is not less than two.
  • At least two messages indicating the value of the transmit power of the BCCH carrier frequency may be periodically received from the base station controller, wherein the values indicated by the at least two messages are gradually decreased.
  • the message periodically received by the BTS from the BSC may indicate the value of the transmit power of the BCCH carrier frequency.
  • the transmitted power of the indicated BCCH carrier frequency is sequentially decreased.
  • the BTS receives a message from the BSC indicating the transmission power of the BCCH carrier frequency every 30 seconds, and the transmission power of the BCCH carrier frequency indicated by these messages gradually decreases in steps of 3 dB.
  • the transmit power of the BCCH carrier frequency can also be gradually reduced in an unsteady step size.
  • the station power control message is used to reduce the transmit power of all time slots of the BCCH carrier frequency of the BTS coverage cell.
  • the BS POWER CONTROL message may include the following information elements: a message discriminator, a message type, a channel number, a BS Power, and a BS Power Parameters.
  • the Message discriminator may be 0000100, which is used to indicate that the message is a dedicated channel management message.
  • the message type may be 10000, which is used to indicate that the message is used for base station power control.
  • the channel number may be 00001TN1TN2TN3 , where the first 5 bits 00001 indicate that the channel type is a full rate channel and its associated control channel, and the last three bits TN1TN2TN3 represent slot numbers 0 to 7.
  • the BS POWER can be represented by 1 byte, wherein the first 4 bits can be used according to the existing reservation mode, and the last four bits can be any value from 0000 to 1111. It can be expressed by 0001 to reduce 2dB on the basis of the maximum transmission power, 0010 means to reduce 4dB, and 1111 means to decrease by 30dB.
  • the reserved bits are used to represent the fractional part of the power reduction decibel number.
  • the last four bits of BS POWER are 0000
  • the first 4 bits are 0001, which means that O.ldB is lowered based on the maximum transmit power
  • 0010 means 0.2dB lower
  • 0011 means 0.3dB lower
  • BS POWER Parameters are related to implementation. For example, the number of decibels set by the base station of some device manufacturers is doubled. The minimum value of the base station power can also be carried through this field. Of course, in BS The information element may also be absent from the POWER CONTROL message.
  • the BS POWER information element carried in each BS POWER CONTROL message can be gradually increased in the same or different steps, so that the BTS can gradually reduce the transmission power of the BCCH carrier frequency under the control of the BSC.
  • the BSC can send a BS POWER CONTROL message to the BTS every 60 seconds, in which the value of BS POWER gradually increases, and the values of the lower four bits are 0001 and 0010, respectively.
  • the transmission power of the BCCH carrier frequency is gradually reduced.
  • At least two messages indicating the value of the minimum access level may be periodically received from the base station controller, wherein the values indicated by the at least two messages are gradually increased.
  • the message periodically received by the BTS from the BSC may indicate the value of the minimum access level.
  • the indicated minimum access levels are sequentially increased.
  • the BTS receives a message from the BSC indicating the minimum access level value every 30 seconds, and the minimum access level indicated by these messages gradually increases in steps of 3 dB.
  • the minimum access level can also be gradually increased in steps that are not constant.
  • the BSC can periodically send a message to the BTS so that the BTS will
  • the RXLEV_ACCESS_MIN parameter defines the minimum access level of the cell. The larger the parameter, the smaller the minimum access level.
  • the RXLEV_ACCESS_MIN parameter is gradually reduced in the message, the indicated minimum access level is gradually increased. As the minimum access level increases, user terminals residing in the idle state in the current cell are reselected in batches to other cells.
  • the typical coding of the RXLEV_ACCESS_MIN parameter is shown in Table 1.
  • the maximum code 110 corresponds to the lowest minimum access level, and when the RXLEV_ACCESS_MIN is decreased, that is, the code value is decreased, the minimum access level is increased.
  • the BSC can send a message carrying the RXLEV_ACCESS_MIN parameter to the BTS every 60 seconds.
  • the BTS obtains the RXLEV_ACCESS_MIN parameter through the message, thereby based on The RXLEV_ACCESS_MIN parameter is used to change the minimum access level. For example, in the message sent by the BSC to the BTS, the value of the RXLEV_ACCESS_MIN parameter is gradually reduced from 110 to 47, indicating that the minimum access level is gradually increased from level 0 to level 63.
  • the BSC can also send the base station power control message to the BTS and send the message carrying the RXLEV_ACCESS_MIN parameter to the BTS, so that the base station power can be reduced and the minimum access level can be increased.
  • the user terminal camping on the BCCH carrier frequency can find that the current cell is less suitable for camping based on the change of the base station power and the minimum access level, and gradually shifts to other cells.
  • the BTS may change a specific physical quantity based on the indicated specific physical quantity. Since the changed physical quantity has different effects on different user terminals (e.g., user terminals having different distances from the base station), when a part of the user terminals finds that the current cell is no longer suitable for camping, the user terminals reselect to the new cell. If the physical quantity is changed multiple times, the user terminal in the idle state can reselect to the new cell in batches.
  • the user terminal in the BTS coverage cell that is in the idle state can detect different values of the specific physical quantity. Due to the different locations of these user terminals, the received signal strengths, etc., cell reselection can be performed in batches based on the value of a particular physical quantity. For example, a user terminal at a cell edge reselects to another cell at a certain initial physical quantity change, and a user terminal closer to the base station reselects to another cell after a certain physical quantity continues to change for a period of time.
  • the value of the transmission power of the BCCH carrier frequency indicated by the message received by the BTS is gradually decreased, so the BTS is based on at least two messages.
  • the value of the transmit power of the BCCH carrier frequency indicated by the message is reduced, and the value of the transmit power of the BCCH carrier frequency is decreased, so that the value of the transmit power of the BCCH carrier frequency reaches the BCCH carrier frequency indicated by each message at different times.
  • the value of the transmit power is the value of the transmit power of the BCCH carrier frequency indicated by the message received by the BTS is gradually decreased, so the BTS is based on at least two messages.
  • the value of the transmit power of the BCCH carrier frequency indicated by the message is reduced, and the value of the transmit power of the BCCH carrier frequency is decreased, so that the value of the transmit power of the BCCH carrier frequency reaches the BCCH carrier frequency indicated by each message at different times.
  • the value of the transmit power is based on at least two messages.
  • the user terminal in the idle state detects the transmit power of the gradually decreasing BCCH carrier frequency at different times, due to the difference in the location of different user terminals, etc., at a certain time, Some user terminals reselect to other cells based on the value of the transmit power of the current BCCH carrier frequency. At another time, some user terminals reselect to other cells based on the value of the transmit power of the current BCCH carrier frequency, etc. Then, the user terminals in the BTS coverage cell that are in an idle state can be selected to other cells in batches.
  • the BTS when the specific physical quantity is the minimum access level, since the value of the minimum access level indicated by the message received by the BTS is gradually increased, the BTS may be based on at least two cancellations.
  • the value of the minimum access level indicated by each message in the message increases the value of the minimum access level, so that the value of the minimum access level reaches the minimum access power indicated by each message at different times. Flat value.
  • the user terminal in the idle state detects the gradually increasing minimum access level at different times, and at a certain moment, due to the difference in the location of different user terminals, etc.
  • the user terminal reselects to other cells based on the value of the current minimum access level, and at another time, some user terminals reselect to other cells based on the value of the current minimum access level, and so on.
  • User terminals in the BTS coverage cell that are in an idle state can be selected to other cells in batches.
  • the user terminal in the idle state can be selected to the neighboring cell in batches based on the value of the specific physical quantity that is gradually changed. Therefore, a large number of user terminals can be effectively prevented from performing cell reselection at the same time, which effectively prevents the occurrence of signaling storms and signaling congestion, so that network performance does not decrease due to the occurrence of a signaling storm, thereby improving network performance.
  • S210 and S220 in method 200 are substantially the same as S110 and S120 in method 100.
  • a command to turn off the broadcast control channel BCCH carrier frequency is received from the base station controller, and the command is sent by the base station controller when the value of the specific physical quantity reaches a predetermined threshold.
  • the BSC may instruct the BTS to turn off the BCCH carrier frequency when it is determined that the specific physical quantity reaches a predetermined threshold. For example, the transmit power of the BCCH carrier frequency is reduced to a sufficiently low level, or the minimum access level is increased to a sufficiently high level that the number of user terminals residing in the current cell is sufficiently small, and the BSC can control the BTS to turn off the BCCH load. Frequency to help close the cell. In this way, even if there is an untransferred user terminal, there will be no signaling storm caused by the BCCH carrier frequency being turned off.
  • the BCCH carrier frequency is turned off based on the command.
  • the BTS After receiving the command from the BSC, the BTS turns off the BCCH carrier frequency. If the BTS has turned off other carrier frequencies, the cell is turned off when the BCCH carrier frequency is turned off. If the BTS has not turned off other carrier frequencies, you can turn off the other carrier frequencies to turn off the cell to save energy.
  • the BCCH carrier frequency when the specific physical quantity changes to a predetermined threshold, the BCCH carrier frequency is turned off, which facilitates the closing of the cell, so that not only energy saving but also smooth closing of the cell can be achieved. It is avoided that signaling storms and signaling congestion occur when the cell is turned off as in the related art, thereby improving network performance.
  • the method 300 includes: at S310, generating at least two messages indicating a value of a specific physical quantity, where the specific physical quantity is used to indicate that the user terminal in the idle state selects the target cell; in S320, to the base station
  • the transceiver sends at least two messages, so that the base transceiver station changes the value of the specific physical quantity according to the value of the specific physical quantity indicated by each of the at least two messages, so that the value of the specific physical quantity reaches each message at different times respectively.
  • the value of the specified specific physical quantity is such that the user terminal in the idle state of the cell selects the neighboring cell in batches according to the value of the specific physical quantity.
  • method 300 can be performed by a BSC.
  • the BSC can control the BTS, which performs the operations that the BSC requires to perform. Since the operation of the BSC corresponds to the operation of the BTS, the relevant content of the method 300 can be referred to the related description in the above method 100.
  • the BSC may periodically generate at least two messages, and the time interval for generating the message may be fixed or variable.
  • the value of a particular physical quantity such as the transmit power of the BCCH carrier frequency and the minimum access level, may be indicated, such that a user terminal based on the idle state in which the camped cell is selected may be caused to perform cell reselection.
  • At least two messages indicating the value of the transmission power of the broadcast control channel BCCH carrier frequency are periodically generated, wherein the values indicated by the at least two messages are gradually decreased.
  • the BSC generated message may indicate the transmit power of the BCCH carrier frequency, and its value gradually decreases as the message is transmitted.
  • the BSC can send a message to the BTS every 60s, and the transmitted power of the indicated BCCH carrier frequency is sequentially reduced by 3dB, 6dB, 9dB, and the like.
  • At least two messages indicating the value of the minimum access level are periodically generated, wherein the values indicated by the at least two messages are gradually increased.
  • the BSC generated message may also indicate the minimum access level, and its value gradually increases as the message is sent. For example, the BSC may send a message to the BTS every 60s, and the indicated minimum access level is sequentially increased by 3dB, 6dB, 9dB, etc., or sequentially increased from level 0 of Table 1 to level 63.
  • the BSC sends the generated message to the BTS.
  • the BTS can receive multiple messages, so that the specific physical quantity is changed based on the value indicated by each message, so that the user terminal under the BTS coverage is batch-selected to the neighboring cell based on the changed value of the specific physical quantity. That is, when a specific physical quantity changes to a certain value, a part of the user terminals are reselected to the new cell; when the specific physical quantity is further changed to another value, another part of the user terminal reselects to the new cell.
  • the operation of the user terminal to perform cell reselection is the same as the related art.
  • the user terminal in the idle state may be selected to the neighboring cell in batches based on the changed specific physical quantity. Therefore, a large number of user terminals can be effectively prevented from performing cell reselection at the same time, which effectively prevents the occurrence of signaling storms and signaling congestion, so that network performance does not decrease due to the occurrence of signaling storms, thereby improving network performance.
  • S410 and S420 in method 400 are substantially identical to S310 and S320 in method 300.
  • the BSC can determine whether a specific metric quantity reaches a predetermined threshold. For example, if the specific physical quantity is the transmit power of the BCCH carrier frequency, the predetermined threshold is a lower value, such as a predetermined threshold being 1/16 of the maximum transmit power of the BCCH carrier frequency. As another example, if the particular physical quantity is the minimum access level, the predetermined threshold is a higher value, such as a predetermined threshold being 16 times the usual minimum access level.
  • the BSC can control the BTS to turn off the BCCH carrier frequency to facilitate the cell's shutdown.
  • S430 For related content of S430, reference may be made to S230 and S240 in the above method 200.
  • the BSC may first use the method for cell reselection according to an embodiment of the present invention to reselect the user terminal in the idle state to the neighboring cell in batches to avoid the signaling storm caused by the sudden shutdown of the cell.
  • the BSC can determine whether it is necessary to turn off the cell covered by the BTS based on a specific policy. For example, in the early hours of the morning or when the traffic in the cell is below a certain value, it may be determined that the cell needs to be turned off to achieve energy savings. If it is determined that the cell needs to be shut down, all the services in the cell are switched to the neighboring cell as much as possible, and then the transmit power of the BCCH carrier frequency and/or the minimum access level of the cell are gradually changed to make the idle state. The user terminal performs cell reselection in batches, and finally closes the cell.
  • the BCCH carrier frequency is closed by instructing the BTS, which is beneficial to realizing cell shutdown, so that not only energy saving but also cell smoothing can be implemented.
  • Shutdown avoids signaling storms and signaling congestion when the cell is shut down as in the related art, thereby improving network performance.
  • FIG. 5 is a block diagram showing the structure of a base transceiver station 500 according to an embodiment of the present invention.
  • the base transceiver station 500 can include a first receiving module 510 and a change module 520.
  • the first receiving module 510 is configured to receive, by the base station controller, at least two messages indicating a value of the specific physical quantity, where the specific physical quantity is used to indicate that the user terminal in the idle state of the current cell selects the target cell.
  • the change module 520 is configured to change the value of the specific physical quantity according to the value of the specific physical quantity indicated by each of the at least two messages, so that the value of the specific physical quantity reaches the value of the specific physical quantity indicated by each message at different times, respectively.
  • the user terminal in the idle state of the cell is selected in batches to the neighboring cell according to the value of the specific physical quantity.
  • the foregoing and other operations and/or functions of the first receiving module 510 and the changing module 520 may refer to S110 and S120 in the above method 100. To avoid repetition, details are not described herein again.
  • the base station transceiver provided by the embodiment of the present invention can make the user terminal in the idle state batch-select to the neighboring cell based on the value of the gradually changing specific physical quantity by gradually changing the specific physical quantity. Therefore, a large number of user terminals can be effectively prevented from performing cell reselection at the same time, which effectively prevents the occurrence of signaling storms and signaling congestion, so that network performance does not decrease due to the occurrence of a signaling storm, thereby improving network performance.
  • Figure 6 is a block diagram showing the structure of a base transceiver station 600 in accordance with an embodiment of the present invention.
  • the first receiving module 610 and the changing module 620 of the base transceiver station 600 are substantially identical to the first receiving module 510 and the changing module 520 of the base transceiver station 500.
  • Base station transceiver 600 may also include a second receiving module 630 and a shutdown module 640, in accordance with an embodiment of the present invention.
  • the second receiving module 630 is operative to receive, from the base station controller, a command to turn off the broadcast control channel BCCH carrier frequency, the command being sent by the base station controller when the value of the specific physical quantity reaches a predetermined threshold.
  • the shutdown module 640 can be used to turn off the BCCH carrier frequency based on the command.
  • the first receiving module 610 is configured to periodically receive, from the base station controller, at least two messages indicating a value of the transmit power of the BCCH carrier frequency, where the values indicated by the at least two messages are gradually decreased.
  • the change module 620 can be configured to reduce the value of the transmit power of the BCCH carrier frequency according to the value of the transmit power of the BCCH carrier frequency indicated by each of the at least two messages, so that the transmit power of the BCCH carrier frequency is obtained.
  • the values respectively reach the values of the transmit power of the BCCH carrier frequency indicated by each message at different times.
  • the first receiving module 610 is operable to periodically slave the base station controller Receiving at least two messages indicating the value of the minimum access level, wherein the values indicated by the at least two messages are gradually increased.
  • the change module 620 can be configured to increase the value of the minimum access level according to the value of the minimum access level indicated by each of the at least two messages, so that the value of the minimum access level is different. The time reaches the value of the minimum access level indicated by each message.
  • the above and other operations and/or functions of the first receiving module 610, the changing module 620, the second receiving module 630, and the closing module 640 may refer to S110 and S120 in the above method 100 and S230 and S240 in the method 200, in order to avoid duplication. , will not repeat them here.
  • the base transceiver station provided by the embodiment of the present invention can help the cell to be closed by turning off the BCCH carrier frequency, so that not only can the energy saving but also the smooth shutdown of the cell can be avoided, as in the related art. Signaling storms and signaling congestion occur when the cell is closed, which can improve network performance.
  • FIG. 7 is a block diagram showing the structure of a base station controller 700 according to an embodiment of the present invention.
  • the base station controller 700 can include a generation module 710 and a first transmission module 720.
  • the generating module 710 is configured to generate at least two messages indicating the value of the specific physical quantity, where the specific physical quantity is used to indicate that the user terminal in the idle state selects the target cell.
  • the first sending module 720 is configured to send at least two messages to the base transceiver station, so that the base transceiver station changes the value of the specific physical quantity according to the value of the specific physical quantity indicated by each of the at least two messages, so that the specific physical quantity is obtained. The value reaches the value of the specific physical quantity indicated by each message at different times, so that the user terminal in the idle state of the cell selects the neighboring cell in batches according to the value of the specific physical quantity.
  • the foregoing operations and/or functions of the generating module 710 and the first sending module 720 may refer to S310 and S320 in the foregoing method 300. To avoid repetition, details are not described herein again.
  • the base station controller provided by the embodiment of the present invention can make the BTS gradually change the specific physical quantity by sending a message to the BTS, so that the user terminal in the idle state can be batch-selected to the neighboring cell based on the value of the changed specific physical quantity. Therefore, a large number of user terminals can be effectively prevented from performing cell reselection at the same time, which effectively prevents the occurrence of signaling storms and signaling congestion, so that network performance does not decrease due to the occurrence of signaling storms, thereby improving network performance.
  • FIG. 8 is a block diagram showing the structure of a base station controller 800 according to an embodiment of the present invention.
  • the generating module 810 and the first transmitting module 820 of the base station controller 800 are substantially the same as the generating module 710 and the first transmitting module 720 of the base station controller 700.
  • the base station controller 800 may further include a second sending module 830.
  • the second sending module 830 can be configured to: when the value of the specific physical quantity reaches a predetermined threshold, to the base transceiver station A command to turn off the BCCH carrier frequency is sent to cause the base transceiver station to turn off the BCCH carrier frequency based on the command.
  • the generating module 810 of the base station controller 800 may include one of the first generating unit 812 and the second generating unit 814.
  • the first generating unit 812 is configured to periodically generate at least two messages indicating a value of the transmit power of the broadcast control channel BCCH carrier frequency, where the value indicated by the at least two messages is gradually decreased.
  • the second generating unit 814 is configured to periodically generate at least two messages indicating the value of the minimum access level, wherein the values indicated by the at least two messages are gradually increased.
  • the foregoing and other operations and/or functions of the first generating unit 812, the second generating unit 814, and the second sending module 830 may refer to S310 in the foregoing method 300 and S430 in the method 400. To avoid repetition, details are not described herein again. .
  • the base station controller provided by the embodiment of the present invention can disable the BCCH carrier frequency by instructing the BTS, which is beneficial to realizing the closing of the cell, so that not only energy saving but also smooth closing of the cell can be achieved, and the related technology is avoided. In this way, signaling storms and signaling congestion occur when the cell is turned off, thereby improving network performance.
  • System 900 includes a base station controller 910 and a base transceiver station 920.
  • the base station controller 910 can be configured to generate at least two messages indicating the value of the specific physical quantity, the specific physical quantity is used to indicate that the user terminal in the idle state of the cell selects the target cell, and the base station transceiver 920 sends at least two messages.
  • the base transceiver station 920 is configured to receive the at least two messages from the base station controller 910; change the value of the specific physical quantity according to the value of the specific physical quantity indicated by each of the at least two messages, so that the values of the specific physical quantity are respectively at different times The value of the specific physical quantity indicated by each message is reached, so that the user terminal in the idle state of the cell selects the neighboring cell in batches according to the value of the specific physical quantity.
  • the above and other operations and/or functions of the base station controller 910 may be referred to the related contents in the above methods 300 and 400.
  • the above and other operations and/or functions of the base transceiver station 920 may refer to the related contents in the above methods 100 and 200, In order to avoid repetition, it will not be described here.
  • the base station controller gradually changes the specific physical quantity by controlling the base station transceiver, so that the user terminal in the idle state can be selected to the neighbor according to the value of the gradually changing specific physical quantity.
  • Community Therefore, a large number of user terminals can be effectively prevented from performing cell reselection at the same time, which effectively prevents the occurrence of signaling storms and signaling congestion, so that network performance does not decrease due to the occurrence of signaling storms, thereby improving network performance.
  • RAM random access memory
  • ROM read only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM or technology Any other form of storage medium known.

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Abstract

本发明实施例提供了用于小区重选的方法、基站收发器、基站控制器及其系统。该方法包括：从基站控制器接收指示特定物理量的取值的消息，所述特定物理量用于指示小区内处于空闲状态的用户终端选择目标小区，其中，在不同时刻，所述消息指示的特定物理量的取值不同；根据所述消息中指示的特定物理量的取值改变所述特定物理量的取值，以使所述小区内处于空闲状态的用户终端根据所述特定物理量的取值分批选择到邻小区。基于上述技术方案，可以有效避免大量用户终端同时进行小区重选，有效防止信令风暴和信令拥塞的出现，使得网络性能不会因为信令风暴的出现而下降，进而可以提高网络性能。

Description

用于小区重选的方法、 基站收发器、 基站控制器及系统 本申请要求于 2011 年 5 月 27 日提交中国专利局、 申请号为 201110140784.4、 发明名称为"用于小区重选的方法、 基站收发器、 基站控制器 及其系统"的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域， 并且更具体地， 涉及通信领域中用于小区重选的方 法、 基站收发器、 基站控制器及其系统。 背景技术
移动通信运营商为了建设一个容量大、 覆盖好、 性能优的网络， 需要部署 成千上万的基站， 而传统基站由于耗电量大， 导致全球各国的主流移动运营商 都成为了该国的耗能大户。 这不仅增加了运营商的运营成本， 而且让他们承担 了节能减排、 保护环境的巨大社会压力。 所以， 节能减排已成为各大运营商的 重点工作之一， 基站节能技术的重要性也显得日益突出。
目前, 在全求移动通信系统 ( Global System for Mobile communications , GSM ) 网络中， 除广播控制信道（Broadcasting Control Channel, BCCH )载频 外， GSM基站的其他载频一般都可以根据业务量的大小动态地进行载频和 /或时 隙的关断， 从而达到节能的目的。 但是， 由于 BCCH载频的所有时隙都必须一 直处于满功率发射状态， 以保证用户终端对邻小区的测量以及后续的重选和切 换等移动性管理流程， 所以 BCCH载频成了 GSM基站节能的一个瓶颈。
为了达到节能的目的， 虽然可以在某些 GSM基站产品中降低 BCCH载频的 发射功率， 但是这样将影响网络的性能， 使得 GSM基站覆盖减小， 小区选择、 重选和切换等流程受到负面影响， 并且由于 BCCH载频仍然打开， 节能效果有 限。
目前还有一种做法是直接关闭某些小区的 BCCH载频和其他载频， 即关闭 该小区。 在这种做法中， 基站控制器（Base Station Controller, BSC )统计小区 中的业务量， 在预设时间段内如果某个小区中的业务量持续走低， 则将该小区 中的业务尽量切换到其他小区， 并直接关闭该小区的 BCCH载频和其他业务载 频， 从而关闭小区。
虽然关闭小区可以节能， 但是处于空闲状态的用户终端由于驻留在 BCCH 载频上， 会因为 BCCH载频信号强度的骤减而进行小区重选， 使得处于空闲状 态的多个用户终端同时向同一目标小区的基站发送请求接入的信令， 这对于重 选的目标小区将造成信令风暴， 引起信令拥塞， 进而影响网络性能。 发明内容
本发明实施例提供了用于小区重选的方法、 基站收发器、 基站控制器及其 系统， 能够避免多个用户终端同时进行小区重选引起的信令风暴， 使得用户终 端重选到邻小区时不会引起信令拥塞， 从而改善网络性能。
一方面， 本发明实施例提供了一种用于小区重选的方法， 包括： 从基站控 制器接收指示特定物理量的取值的消息， 所述特定物理量用于指示小区内处于 空闲状态的用户终端选择目标小区， 其中， 在不同时刻， 所述消息指示的特定 物理量的取值不同； 根据所述消息中指示的特定物理量的取值改变所述特定物 理量的取值， 以使所述小区内处于空闲状态的用户终端根据所述特定物理量的 取值分批选择到邻小区。。
另一方面， 本发明实施例提供了一种用于小区重选的方法， 包括： 生成指 示特定物理量的取值的消息， 所述特定物理量用于指示小区内处于空闲状态的 用户终端选择目标小区， 其中， 在不同时刻， 所述消息指示的特定物理量的取 值不同； 在不同时刻， 向基站收发器发送所述消息， 以使所述基站收发器根据 所述消息中指示的特定物理量的取值改变所述特定物理量的取值， 从而使所述 小区内处于空闲状态的用户终端根据所述特定物理量的取值分批选择到邻小 区。
再一方面， 本发明实施例提供了一种基站收发器， 包括： 第一接收模块， 用于从基站控制器接收指示特定物理量的取值的消息， 所述特定物理量用于指 示小区内处于空闲状态的用户终端选择目标小区， 其中， 在不同时刻， 所述第 一接收模块接收的所述消息指示的特定物理量的取值不同； 改变模块， 用于根 据所述消息中指示的特定物理量的取值改变所述特定物理量的取值， 以使所述 小区内处于空闲状态的用户终端根据所述特定物理量的取值分批选择到邻小 区。
又一方面， 本发明实施例提供了一种基站控制器， 包括： 生成模块， 用于 生成指示特定物理量的取值的消息， 所述特定物理量用于指示小区内处于空闲 状态的用户终端选择目标小区， 其中， 在不同时刻， 所述生成模块生成的所述 消息指示的特定物理量的取值不同； 第一发送模块， 用于在不同时刻， 向基站 收发器发送所述消息， 以使所述基站收发器根据所述消息指示的特定物理量的 取值改变所述特定物理量的取值， 从而使所述小区内处于空闲状态的用户终端 根据所述特定物理量的取值分批选择到邻小区。
又一方面， 本发明实施例提供了一种用于小区重选的系统， 包括基站控制 器和基站收发器。 所述基站控制器， 用于生成指示特定物理量的取值的消息， 所述特定物理量用于指示小区内处于空闲状态的用户终端选择目标小区， 其中， 在不同时刻， 所述基站控制器生成的所述消息指示的特定物理量的取值不同； 所述基站控制器还用于向所述基站收发器发送所述消息； 所述基站收发器， 用 于在不同时刻， 从所述基站控制器接收所述消息； 所述基站收发器还用于根据 所述消息中指示的特定物理量的取值改变所述特定物理量的取值， 以使所述小 区内处于空闲状态的用户终端根据所述特定物理量的取值分批选择到邻小区。
基于上述技术方案， 通过逐渐改变特定物理量， 可以使处于空闲状态的用 户终端基于逐渐改变的特定物理量的取值分批选择到邻小区。 从而， 可以有效 避免大量用户终端同时进行小区重选， 有效防止信令风暴和信令拥塞的出现， 使得网络性能不会因为信令风暴的出现而下降， 进而可以提高网络性能。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例中所需要使 用的附图作筒单地介绍， 显而易见地， 下面描述中的附图仅仅是本发明的一些 实施例， 对于本领域技术人员来讲， 在不付出创造性劳动的前提下， 还可以根 据这些附图获得其他的附图。 图 1是根据本发明实施例的用于小区重选的方法的流程图。
图 2是根据本发明实施例的用于小区重选的另一方法的流程图。
图 3是根据本发明实施例的用于小区重选的再一方法的流程图。
图 4是根据本发明实施例的用于小区重选的又一方法的流程图。
图 5是根据本发明实施例的基站收发器的结构框图。
图 6是根据本发明实施例的另一基站收发器的结构框图。
图 7是根据本发明实施例的基站控制器的结构框图。
图 8是根据本发明实施例的另一基站控制器的结构框图。
图 9是根据本发明实施例的用于小区重选的系统的结构框图。 具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明的一部分实施例， 而不是全部实 施例。 基于本发明中的所述实施例， 本领域技术人员在没有做出创造性劳动的 前提下所获得的所有其他实施例， 都应属于本发明保护的范围。
首先， 图 1是根据本发明实施例的用于小区重选的方法 100的流程图。 如图 1所示， 方法 100包括： 在 S110中， 从基站控制器接收指示特定物理 量的取值的至少两个消息， 特定物理量用于指示本小区处于空闲状态的用户终 端选择目标小区； 在 S120中， 根据至少两个消息中每个消息指示的特定物理量 的取值改变特定物理量的取值， 使得特定物理量的取值在不同时刻分别达到每 个消息指示的特定物理量的取值， 以使本小区处于空闲状态的用户终端根据特 定物理量的取值分批选择到邻小区。
例如， 方法 100可以由基站收发器（ Base Transceiver Station, BTS )执行。 BTS受基站控制器（Base Station Controller, BSC )控制而执行相应操作。 BTS 和 BSC可能位于同一设备中， 也可能位于不同设备中。 一个 BTS受一个 BSC 控制， 但一个 BSC可以控制多个 BTS。
在 S110中， BTS从 BSC接收至少两个消息， 这些消息中的每个消息指示 特定物理量的取值。
特定物理量可以是 BCCH载频的发射功率， 也可以是最小接入电平， 还可 以是本领域技术人员可以想到的用户终端用来进行小区选择的其他特定物理 量。 小区中处于空闲状态的用户终端通过检测特定物理量， 可以确定是仍然驻 留在当前小区还是选择到新的小区。 BTS可以周期性从 BSC接收至少两个消息， 接收时间间隔可以定长也可以 不定长， 接收的消息总个数不少于两个。
根据本发明的一个实施例， 可以周期性从基站控制器接收指示 BCCH载频 的发射功率的取值的至少两个消息， 其中至少两个消息指示的取值逐渐减小。
BTS周期性从 BSC接收的消息可以指示 BCCH载频的发射功率的取值。在 按照时间先后顺序接收的消息中， 所指示的 BCCH载频的发射功率依次减小。 例如， BTS每隔 30秒从 BSC接收指示 BCCH载频的发射功率取值的消息， 这 些消息指示的 BCCH载频的发射功率以 3dB的步长逐渐降低。 当然， BCCH载 频的发射功率也可以以不恒定的步长逐渐降低。 站功率控制 ) 消息， 来降低 BTS覆盖小区的 BCCH载频所有时隙的发射功率。
BS POWER CONTROL消息可以包括如下信息元： 消息指示符（ Message discriminator )、 消息类型 ( Message type )、 信道号 ( Channel number )、 BS Power (基站功率 )和 BS Power Parameters (基站功率参数）。
其中， Message discriminator可以是 0000100, 用于表示该消息是专用信道 管理消息。
Message type可以是 10000, 用于表示该消息用于进行基站功率控制。
Channel number可以是 00001TN1TN2TN3 , 其中前 5个比特 00001表示信道类 型是全速率信道及其随路控制信道,后三个比特 TN1TN2TN3表示时隙号 0至 7。
BS POWER可以用 1个字节来表示， 其中前 4个比特可以根据现有的预留 方式而不使用， 后四个比特可以是 0000至 1111中任意值。 可以用 0001表示在 最大发射功率的基础上降低 2dB, 0010表示降低 4dB, ... ... , 1111表示降低 30dB。
当然， 也可以使用预留比特和后四个比特一起来表示 BS POWER。 例如， 使用预留比特来表示功率降低分贝数中的小数部分。 例如， 当 BS POWER的后 四位为 0000时， 前 4个比特为 0001表示在最大发射功率的基础上降低 O.ldB, 0010表示降低 0.2dB, 0011表示降低 0.3dB, 以此类推。 还可以为预留比特设置 不同的含义。 例如， 当预留比特的最后一位为 1时， 功率以后四个比特表示的 分贝数的两倍下降。
BS POWER Parameters与具体实现有关。例如，在某些设备制造商的基站设 示的分贝数缩小一倍。 也可以通过该字段携带基站功率的最小值。 当然， 在 BS POWER CONTROL消息中也可以没有该信息元。
每条 BS POWER CONTROL消息携带的 BS POWER信息元可以以相同或 不同的步长逐渐增大， 这样 BTS在 BSC的控制下可以逐渐减小 BCCH载频的 发射功率。 例如， BSC可以每隔 60秒向 BTS发送一条 BS POWER CONTROL 消息，其中 BS POWER的值逐渐增大，低四位的值依次分别为 0001、0010
1111 , 使得 BCCH载频的发射功率逐渐减小。
根据本发明的一个实施例， 可以周期性从基站控制器接收指示最小接入电 平的取值的至少两个消息， 其中至少两个消息指示的取值逐渐增大。
BTS周期性从 BSC接收的消息可以指示最小接入电平的取值。 在按照时间 先后顺序接收的消息中， 所指示的最小接入电平依次增大。 例如， BTS每隔 30 秒从 BSC接收指示最小接入电平取值的消息， 这些消息指示的最小接入电平以 3dB的步长逐渐增大。 当然， 最小接入电平也可以以不恒定的步长逐渐增大。
举例来说， BSC可以周期性地向 BTS发送消息， 以使 BTS将与
"RXLEV_ACCESS_MIN" 所对应的电平值以相同或不同的步长增大。
RXLEV_ACCESS_MIN参数定义了小区的最小接入电平， 该参数越大， 最小接 入电平越小。 当在消息中逐渐减小 RXLEV_ACCESS_MIN参数时， 指示的最小 接入电平逐渐增大。 随着最小接入电平的增大， 驻留在当前小区中处于空闲状 态的用户终端分批重选到其他小区。
RXLEV_ACCESS_MIN参数的典型编码如表 1所示。 其中最大编码 110对 应最低的最小接入电平， 当 RXLEV_ACCESS_MIN减小即编码值减小时， 最小 接入电平增大。
表 1
Figure imgf000008_0001
BSC可以每隔 60秒向 BTS发送一条携带 RXLEV_ACCESS_MIN参数的消 息。 BTS通过该消息获取 RXLEV_ACCESS_MIN参数， 从而基于 RXLEV_ACCESS_MIN参数来改变最小接入电平。 例如， 在 BSC发送给 BTS 的消息中， RXLEV_ACCESS_MIN参数的值从 110逐渐减小为 47, 即指示最小 接入电平从等级 0逐渐增大到等级 63。
当然， BSC也可以既向 BTS发送基站功率控制消息， 又向 BTS发送携带 RXLEV_ACCESS_MIN参数的消息， 使得可以既减小基站功率又增大最小接入 电平。 这样， 驻留在 BCCH载频上的用户终端可以基于基站功率和最小接入电 平两者的改变， 发现当前小区越来越不适合驻留， 从而逐渐转移到其他小区中。
在 S120中， BTS基于所指示的特定物理量取值， 可以改变特定物理量。 由 于改变后的物理量对不同的用户终端 （例如， 离基站距离不同的用户终端）影 响不同， 使得当一部分用户终端发现当前小区不再适合驻留时， 这些用户终端 重选到新的小区。 如果多次改变物理量， 则处于空闲状态的用户终端可以分批 地重选到新的小区。
这样， 随着特定物理量的改变， 在不同的时刻， BTS覆盖小区中处于空闲 状态的用户终端可以检测到特定物理量的不同取值。 由于这些用户终端所处位 置的不同、 接收到的信号强度不同等， 可以基于特定物理量的取值而分批进行 小区重选。 例如， 小区边缘的用户终端在特定物理量改变的初期重选到其他小 区， 而离基站较近的用户终端则在特定物理量持续改变一段时间后重选到其他 小区。
根据本发明的一个实施例， 当特定物理量是 BCCH载频的发射功率时， 由 于 BTS收到的消息指示的 BCCH载频的发射功率的取值逐渐减小， 所以 BTS 根据至少两个消息中每个消息指示的 BCCH载频的发射功率的取值，减小 BCCH 载频的发射功率的取值， 使得 BCCH载频的发射功率的取值在不同时刻分别达 到每个消息指示的 BCCH载频的发射功率的取值。
这样， 在 BCCH载频的发射功率减小的过程中， 空闲状态的用户终端在不 同时刻检测到逐渐减小的 BCCH载频的发射功率， 由于不同用户终端位置的差 异等， 在某个时刻， 有部分用户终端基于当前 BCCH载频的发射功率的取值重 选到其他小区， 在另一时刻， 又有部分用户终端基于当前 BCCH载频的发射功 率的取值重选到其他小区， 等等， 于是 BTS覆盖小区中处于空闲状态的用户终 端可以分批选择到其他小区。
根据本发明的一个实施例， 当特定物理量是最小接入电平时， 由于 BTS收 到的消息指示的最小接入电平的取值逐渐增大， 所以 BTS可以根据至少两个消 息中每个消息指示的最小接入电平的取值， 增大最小接入电平的取值， 使得最 小接入电平的取值在不同时刻分别达到每个消息指示的最小接入电平的取值。
这样， 在最小接入电平增大的过程中， 空闲状态的用户终端在不同时刻检 测到逐渐增大的最小接入电平， 由于不同用户终端位置的差异等， 在某个时刻， 有部分用户终端基于当前最小接入电平的取值重选到其他小区， 在另一时刻， 又有部分用户终端基于当前最小接入电平的取值重选到其他小区， 等等， 于是
BTS覆盖小区中处于空闲状态的用户终端可以分批选择到其他小区。
根据本发明实施例提供的用于小区重选的方法， 通过逐渐改变特定物理量， 可以使处于空闲状态的用户终端基于逐渐改变的特定物理量的取值分批选择到 邻小区。 从而， 可以有效避免大量用户终端同时进行小区重选， 有效防止信令 风暴和信令拥塞的出现， 使得网络性能不会因为信令风暴的出现而下降， 进而 可以提高网络性能。
图 2是根据本发明实施例的用于小区重选的方法 200的流程图。 方法 200 中的 S210和 S220与方法 100中的 S110和 S120基本相同。
在 S230中，从基站控制器接收关闭广播控制信道 BCCH载频的命令， 该命 令由基站控制器在特定物理量的取值达到预定阈值时发送。
BSC在控制 BTS改变特定物理量的过程中， 当确定特定物理量达到预定阈 值时， 可以命令 BTS关闭 BCCH载频。 例如， BCCH载频的发射功率降到足够 低的水平， 或者最小接入电平增大到足够高的水平， 以致能驻留在当前小区中 的用户终端足够少， BSC可以控制 BTS关闭 BCCH载频以有助于小区的关闭。 这样， 哪怕还有未转移的用户终端， 也不会由于 BCCH载频的关闭而引起信令 风暴。
在 S240中， 基于命令， 关闭 BCCH载频。
BTS收到 BSC发出的命令后， 关闭 BCCH载频。 如果 BTS已经关闭了其 他载频， 则关闭 BCCH载频时小区关闭。 如果 BTS还没有关闭其他载频， 则可 以关闭其他载频从而关闭小区， 以实现节能。
根据本发明实施例提供的用于小区重选的方法， 当特定物理量改变达到预 定阈值时， 通过关闭 BCCH载频， 有利于实现小区的关闭， 使得不仅可以节能， 还可以实现小区的平滑关闭， 避免如相关技术那样在关闭小区时出现信令风暴 和信令拥塞， 从而可以提高网络性能。
接下来， 参考图 3描述根据本发明实施例的用于小区重选的方法 300。 如图 3所示， 方法 300包括： 在 S310中， 生成指示特定物理量的取值的至 少两个消息， 特定物理量用于指示本小区处于空闲状态的用户终端选择目标小 区； 在 S320中， 向基站收发器发送至少两个消息， 以使基站收发器根据至少两 个消息中每个消息指示的特定物理量的取值改变特定物理量的取值， 使得特定 物理量的取值在不同时刻分别达到每个消息指示的特定物理量的取值， 从而使 本小区处于空闲状态的用户终端根据特定物理量的取值分批选择到邻小区。
例如， 方法 300可以由 BSC执行。 BSC可以控制 BTS, BTS执行 BSC要 求其执行的操作。 由于 BSC的操作与 BTS的操作相对应， 因此方法 300的相关 内容可以参考上述方法 100中的相关描述。
在 S310中， BSC可以周期性生成至少两个消息， 生成消息的时间间隔可以 是固定的、 也可以是可变的。 在每个消息中， 可以指示诸如 BCCH载频的发射 功率和最小接入电平之类的特定物理量的取值， 从而可以引起基于其选择驻留 小区的空闲状态的用户终端进行小区重选。
根据本发明的一个实施例， 周期性生成指示广播控制信道 BCCH载频的发 射功率的取值的至少两个消息， 其中至少两个消息指示的取值逐渐减小。
为了使用户终端分批重选到其他小区， BSC生成的消息可以指示 BCCH载 频的发射功率， 并且其取值随着消息的发送顺序逐渐减小。 例如， BSC可以每 隔 60s向 BTS发送消息， 指示的 BCCH载频的发射功率依次降低 3dB、 6dB、 9dB等。
根据本发明的一个实施例， 周期性生成指示最小接入电平的取值的至少两 个消息， 其中至少两个消息指示的取值逐渐增大。
为了使用户终端分批重选到其他小区， BSC生成的消息也可以指示最小接 入电平， 并且其取值随着消息的发送顺序逐渐增大。 例如， BSC可以每隔 60s 向 BTS发送消息， 指示的最小接入电平依次增大 3dB、 6dB、 9dB等， 或从表 1 的等级 0依次增大到等级 63。
在 S320中， BSC将生成的消息发送给 BTS。这样， BTS可以收到多个消息， 从而基于每个消息指示的取值来改变特定物理量， 从而使 BTS覆盖下的用户终 端基于特定物理量改变后的取值分批选择到邻小区。 也就是， 当特定物理量改 变到某个值时， 一部分用户终端重选到新的小区； 当特定物理量进一步改变到 另一个值时， 又一部分用户终端重选到新的小区。 用户终端进行小区重选的操 作与相关技术相同。 根据本发明实施例提供的用于小区重选的方法， 通过向 BTS发送消息来使 BTS逐渐改变特定物理量， 可以使处于空闲状态的用户终端基于改变后的特定 物理量分批选择到邻小区。 从而， 可以有效避免大量用户终端同时进行小区重 选， 有效防止信令风暴和信令拥塞的出现， 使得网络性能不会因为信令风暴的 出现而下降， 进而提高网络性能。
图 4是根据本发明实施例的用于小区重选的方法 400的流程图。 方法 400 中的 S410和 S420与方法 300中的 S310和 S320基本相同。
在 S430中， 当特定物理量的取值达到预定阈值时， 向基站收发器发送关闭 BCCH载频的命令， 以使基站收发器基于命令关闭 BCCH载频。
BSC在改变特定物理量的过程中，可以确定特定特理量是否达到预定阈值。 例如， 如果特定物理量是 BCCH载频的发射功率， 则预定阈值是较低的值， 比 如预定阈值是 BCCH载频最大发射功率的 1/16。 再例如， 如果特定物理量是最 小接入电平， 则预定阈值是较高的值， 比如预定阈值是常用的最小接入电平的 16倍。
当特定物理量达到预定阈值时， 可以说明 BCCH载频的发射功率降到了足 够低的水平， 或者最小接入电平增大到了足够高的水平， 以致能驻留在当前小 区中的用户终端足够少。 因此， BSC可以控制 BTS关闭 BCCH载频以有助于小 区的关闭。 S430的相关内容可以参考上述方法 200中的 S230和 S240。
换言之， BSC在关闭小区之前， 可以首先利用根据本发明实施例的用于小 区重选的方法来使空闲状态的用户终端分批重选到邻小区， 以避免突然关闭小 区引起的信令风暴。
BSC可以基于特定策略来确定是否需要关闭 BTS所覆盖的小区。 例如， 在 凌晨时段或者在小区中的业务量低于特定值的情况下， 可以确定需要关闭该小 区以实现节能。 如果确定需要关闭小区， 则可以如相关技术那样， 使小区中所 有的业务被尽量切换到邻小区， 然后逐渐改变 BCCH载频的发射功率和 /或小区 的最小接入电平， 以使空闲状态的用户终端分批进行小区重选， 最后再关闭小 区。
根据本发明实施例提供的用于小区重选的方法， 当特定物理量改变达到预 定阈值时， 通过命令 BTS关闭 BCCH载频， 有利于实现小区的关闭， 使得不仅 可以节能， 还可以实现小区的平滑关闭， 避免如相关技术那样在关闭小区时出 现信令风暴和信令拥塞， 从而可以提高网络性能。 上面描述了根据本发明实施例的用于小区重选的方法，下面结合图 5至图 8 描述根据本发明实施例的相关设备的结构框图。
图 5是根据本发明实施例的基站收发器 500的结构框图。
基站收发器 500可以包括第一接收模块 510和改变模块 520。第一接收模块 510可用于从基站控制器接收指示特定物理量的取值的至少两个消息，特定物理 量用于指示本小区处于空闲状态的用户终端选择目标小区。 改变模块 520可用 于根据至少两个消息中每个消息指示的特定物理量的取值改变特定物理量的取 值， 使得特定物理量的取值在不同时刻分别达到每个消息指示的特定物理量的 取值， 以使本小区处于空闲状态的用户终端根据特定物理量的取值分批选择到 邻小区。
第一接收模块 510和改变模块 520的上述和其他操作和 /或功能可以参考上 述方法 100中的 S110和 S120, 为了避免重复， 在此不再赘述。
本发明实施例提供的基站收发器通过逐渐改变特定物理量， 可以使处于空 闲状态的用户终端基于逐渐变化的特定物理量的取值分批选择到邻小区。 从而， 可以有效避免大量用户终端同时进行小区重选， 有效防止信令风暴和信令拥塞 的出现， 使得网络性能不会因为信令风暴的出现而下降， 进而可以提高网络性 能。
图 6是根据本发明实施例的基站收发器 600的结构框图。 基站收发器 600 的第一接收模块 610和改变模块 620与基站收发器 500的第一接收模块 510和 改变模块 520基本相同。
根据本发明的一个实施例， 基站收发器 600还可以包括第二接收模块 630 和关闭模块 640。第二接收模块 630可用于从基站控制器接收关闭广播控制信道 BCCH载频的命令， 该命令由基站控制器在特定物理量的取值达到预定阈值时 发送。 关闭模块 640可用于基于命令， 关闭 BCCH载频。
根据本发明的一个实施例， 第一接收模块 610可用于周期性从基站控制器 接收指示 BCCH载频的发射功率的取值的至少两个消息， 其中至少两个消息指 示的取值逐渐减小。 此时， 改变模块 620可用于根据至少两个消息中每个消息 指示的 BCCH载频的发射功率的取值， 减小 BCCH载频的发射功率的取值， 使 得 BCCH载频的发射功率的取值在不同时刻分别达到每个消息指示的 BCCH载 频的发射功率的取值。
根据本发明的一个实施例， 第一接收模块 610可用于周期性从基站控制器 接收指示最小接入电平的取值的至少两个消息， 其中至少两个消息指示的取值 逐渐增大。 此时， 改变模块 620可用于根据至少两个消息中每个消息指示的最 小接入电平的取值， 增大最小接入电平的取值， 使得最小接入电平的取值在不 同时刻分别达到每个消息指示的最小接入电平的取值。
第一接收模块 610、 改变模块 620、 第二接收模块 630和关闭模块 640的上 述和其他操作和 /或功能可以参考上述方法 100中的 S110和 S120以及方法 200 中的 S230和 S240, 为了避免重复， 在此不再赘述。
当特定物理量改变达到预定阈值时， 本发明实施例提供的基站收发器通过 关闭 BCCH载频， 有利于实现小区的关闭， 使得不仅可以节能， 还可以实现小 区的平滑关闭， 避免如相关技术那样在关闭小区时出现信令风暴和信令拥塞， 从而可以提高网络性能。
图 7是根据本发明实施例的基站控制器 700的结构框图。
基站控制器 700可以包括生成模块 710和第一发送模块 720。 生成模块 710 可用于生成指示特定物理量的取值的至少两个消息， 特定物理量用于指示本小 区处于空闲状态的用户终端选择目标小区。 第一发送模块 720可用于向基站收 发器发送至少两个消息， 以使基站收发器根据至少两个消息中每个消息指示的 特定物理量的取值改变特定物理量的取值， 使得特定物理量的取值在不同时刻 分别达到每个消息指示的特定物理量的取值， 从而使本小区处于空闲状态的用 户终端根据特定物理量的取值分批选择到邻小区。
生成模块 710和第一发送模块 720的上述和其他操作和 /或功能可以参考上 述方法 300中的 S310和 S320, 为了避免重复， 在此不再赘述。
本发明实施例提供的基站控制器通过向 BTS发送消息来使 BTS逐渐改变特 定物理量， 可以使处于空闲状态的用户终端基于改变后的特定物理量的取值分 批选择到邻小区。 从而， 可以有效避免大量用户终端同时进行小区重选， 有效 防止信令风暴和信令拥塞的出现， 使得网络性能不会因为信令风暴的出现而下 降， 进而提高网络性能。
图 8是根据本发明实施例的基站控制器 800的结构框图。 基站控制器 800 的生成模块 810和第一发送模块 820与基站控制器 700的生成模块 710和第一 发送模块 720基本相同。
根据本发明的一个实施例， 基站控制器 800还可以包括第二发送模块 830。 第二发送模块 830可用于当特定物理量的取值达到预定阈值时， 向基站收发器 发送关闭 BCCH载频的命令， 以使基站收发器基于命令关闭 BCCH载频。 根据本发明的实施例， 基站控制器 800的生成模块 810可以包括第一生成 单元 812和第二生成单元 814之一。 第一生成单元 812可用于周期性生成指示 广播控制信道 BCCH载频的发射功率的取值的至少两个消息， 其中至少两个消 息指示的取值逐渐减小。 第二生成单元 814可用于周期性生成指示最小接入电 平的取值的至少两个消息， 其中至少两个消息指示的取值逐渐增大。
第一生成单元 812、第二生成单元 814和第二发送模块 830的上述和其他操 作和 /或功能可以参考上述方法 300中的 S310以及方法 400中的 S430, 为了避 免重复， 在此不再赘述。
当特定物理量改变达到预定阈值时， 本发明实施例提供的基站控制器通过 命令 BTS关闭 BCCH载频， 有利于实现小区的关闭， 使得不仅可以节能， 还可 以实现小区的平滑关闭， 避免如相关技术那样在关闭小区时出现信令风暴和信 令拥塞， 从而可以提高网络性能。
下面， 结合图 9描述根据本发明实施例的用于小区重选的系统 900的结构 框图。 系统 900包括基站控制器 910和基站收发器 920。
基站控制器 910可用于生成指示特定物理量的取值的至少两个消息， 特定 物理量用于指示本小区处于空闲状态的用户终端选择目标小区； 向基站收发器 920发送至少两个消息。
基站收发器 920可用于从基站控制器 910接收至少两个消息； 根据至少两 个消息中每个消息指示的特定物理量的取值改变特定物理量的取值， 使得特定 物理量的取值在不同时刻分别达到每个消息指示的特定物理量的取值， 以使本 小区处于空闲状态的用户终端根据特定物理量的取值分批选择到邻小区。
基站控制器 910的上述和其他操作和 /或功能可以参考上述方法 300和 400 中的相关内容， 基站收发器 920的上述和其他操作和 /或功能可以参考上述方法 100和 200中的相关内容， 为了避免重复， 在此不再赘述。
根据本发明实施例提供的用于小区重选的系统， 基站控制器通过控制基站 收发器逐渐改变特定物理量， 可以使处于空闲状态的用户终端基于逐渐改变的 特定物理量的取值分批选择到邻小区。 从而， 可以有效避免大量用户终端同时 进行小区重选， 有效防止信令风暴和信令拥塞的出现， 使得网络性能不会因为 信令风暴的出现而下降， 进而提高网络性能。
本领域技术人员可以意识到， 结合本文中所公开的实施例中描述的各方法 步骤和单元， 能够以电子硬件、 计算机软件或者二者的结合来实现， 为了清楚 地说明硬件和软件的可互换性， 在上述说明中已经按照功能一般性地描述了各 实施例的步骤及组成。 这些功能究竟以硬件还是软件方式来执行， 取决于技术 方案的特定应用和设计约束条件。 本领域技术人员可以对每个特定的应用使用 不同方法来实现所描述的功能， 但是这种实现不应认为超出本发明的范围。
结合本文中所公开的实施例描述的方法步骤可以用硬件、 处理器执行的软 件程序、 或者二者的结合来实施。 软件程序可以置于随机存取存储器（RAM )、 内存、 只读存储器（ROM )、 电可编程 ROM、 电可擦除可编程 ROM、 寄存器、 硬盘、 可移动磁盘、 CD-ROM或技术领域内所公知的任意其它形式的存储介质 中。
尽管已示出和描述了本发明的一些实施例， 但本领域技术人员应该理解， 在不脱离本发明的原理和精神的情况下， 可对这些实施例进行各种修改， 这样 的修改应落入本发明的范围内。

Claims

权利要求书
1. 一种用于小区重选的方法， 其特征在于， 包括：
从基站控制器接收指示特定物理量的取值的消息， 所述特定物理量用于指 示小区内处于空闲状态的用户终端选择目标小区， 其中， 在不同时刻， 所述消 息指示的特定物理量的取值不同；
根据所述消息中指示的特定物理量的取值改变所述特定物理量的取值， 以 使所述小区内处于空闲状态的用户终端根据所述特定物理量的取值分批选择到 邻小区。
2. 根据权利要求 1所述的方法， 其特征在于， 还包括：
从所述基站控制器接收关闭广播控制信道 BCCH载频的命令， 所述命令由 所述基站控制器在所述特定物理量的取值达到预定阈值时发送；
基于所述命令， 关闭所述 BCCH载频。
3. 根据权利要求 1所述的方法， 其特征在于， 从所述基站控制器接收指示 特定物理量的取值的消息， 包括：
周期性从所述基站控制器接收指示 BCCH载频的发射功率的取值的消息， 所述消息指示的取值逐渐减小；
所述^ f艮据所述消息中指示的特定物理量的取值改变所述特定物理量的取值 包括：
根据所述消息中指示的 BCCH载频的发射功率的取值， 减小 BCCH载频的 发射功率的取值， 使得所述 BCCH载频的发射功率的取值在不同时刻分别达到 所述消息指示的 BCCH载频的发射功率的取值。
4. 根据权利要求 3所述的方法， 其特征在于，根据权利要求 1所述的方法， 其特征在于， 所述消息指示的取值以相同步长逐渐减小。
5. 根据权利要求 1到 4中任意一项所述的方法， 其特征在于， 从所述基站 控制器接收的所述消息为基站功率控制消息。
6. 根据权利要求 1所述的方法， 其特征在于， 从所述基站控制器接收指示 特定物理量的取值的消息， 包括：
周期性从所述基站控制器接收指示最小接入电平的取值的消息， 所述消息 指示的取值逐渐增大；
所述^ f艮据所述消息中指示的特定物理量的取值改变所述特定物理量的取值 包括： 根据所述消息中指示的最小接入电平的取值， 增大最小接入电平的取值， 使得所述最小接入电平的取值在不同时刻分别达到所述消息指示的最小接入电 平的取值。
7. 根据权利要求 6所述的方法， 其特征在于， 所述消息指示的取值以相同 步长逐渐增大。
8. 一种用于小区重选的方法， 其特征在于， 包括：
生成指示特定物理量的取值的消息， 所述特定物理量用于指示小区内处于 空闲状态的用户终端选择目标小区， 其中， 在不同时刻， 所述消息指示的特定 物理量的取值不同；
在不同时刻， 向基站收发器发送所述消息， 以使所述基站收发器根据所述 消息中指示的特定物理量的取值改变所述特定物理量的取值， 从而使所述小区 内处于空闲状态的用户终端根据所述特定物理量的取值分批选择到邻小区。
9. 根据权利要求 8所述的方法， 其特征在于， 还包括：
当所述特定物理量的取值达到预定阈值时， 向所述基站收发器发送关闭广 播控制信道 BCCH载频的命令， 以使所述基站收发器基于所述命令关闭所述 BCCH载频。
10. 根据权利要求 8或 9所述的方法， 其特征在于， 向所述基站控制器发 送的所述消息为基站功率控制消息。
11. 根据权利要求 8所述的方法， 其特征在于， 所述生成指示特定物理量 的取值的消息包括如下之一：
周期性生成指示 BCCH载频的发射功率的取值的消息， 所述消息指示的取 值逐渐减小；
周期性生成指示最小接入电平的取值的消息， 所述消息指示的取值逐渐增 大。
12. 根据权利要求 11所述的方法， 其特征在于， 当所述消息指示的取值逐 渐减小时， 所述消息指示的取值以相同步长逐渐减小； 当所述消息指示的取值 逐渐增大时， 所述消息指示的取值以相同步长逐渐增大。
13. 一种基站收发器， 其特征在于， 包括：
第一接收模块， 用于从基站控制器接收指示特定物理量的取值的消息， 所 述特定物理量用于指示小区内处于空闲状态的用户终端选择目标小区， 其中， 在不同时刻， 所述第一接收模块接收的所述消息指示的特定物理量的取值不同； 改变模块， 用于根据所述消息中指示的特定物理量的取值改变所述特定物 理量的取值， 以使所述小区内处于空闲状态的用户终端根据所述特定物理量的 取值分批选择到邻小区。
14. 根据权利要求 13所述的基站收发器， 其特征在于， 还包括： 第二接收模块， 用于从所述基站控制器接收关闭广播控制信道 BCCH载频 的命令， 所述命令由所述基站控制器在所述特定物理量的取值达到预定阈值时 发送；
关闭模块， 用于基于所述命令， 关闭所述 BCCH载频。
15. 根据权利要求 13所述的基站收发器， 其特征在于， 所述第一接收模块 用于周期性从所述基站控制器接收指示 BCCH载频的发射功率的取值的消息， 所述消息指示的取值逐渐减小；
所述改变模块用于根据所述消息中指示的 BCCH载频的发射功率的取值， 减小 BCCH载频的发射功率的取值， 使得所述 BCCH载频的发射功率的取值在 不同时刻分别达到所述消息指示的 BCCH载频的发射功率的取值。
16. 根据权利要求 13所述的基站收发器， 其特征在于， 所述第一接收模块 用于周期性从所述基站控制器接收指示最小接入电平的取值的消息， 所述消息 指示的取值逐渐增大；
所述改变模块用于根据所述消息中指示的最小接入电平的取值， 增大最小 接入电平的取值， 使得所述最小接入电平的取值在不同时刻分别达到消息指示 的最小接入电平的取值。
17. 一种基站控制器， 其特征在于， 包括：
生成模块， 用于生成指示特定物理量的取值的消息， 所述特定物理量用于 指示小区内处于空闲状态的用户终端选择目标小区， 其中， 在不同时刻， 所述 生成模块生成的所述消息指示的特定物理量的取值不同；
第一发送模块， 用于在不同时刻， 向基站收发器发送所述消息， 以使所述 基站收发器根据所述消息指示的特定物理量的取值改变所述特定物理量的取 值， 从而使所述小区内处于空闲状态的用户终端根据所述特定物理量的取值分 批选择到邻小区。
18. 根据权利要求 17所述的基站控制器， 其特征在于， 还包括： 第二发送模块， 用于当所述特定物理量的取值达到预定阈值时， 向所述基 站收发器发送关闭广播控制信道 BCCH载频的命令， 以使所述基站收发器基于 所述命令关闭所述 BCCH载频。
19. 根据权利要求 17所述的基站控制器， 其特征在于， 所述生成模块包括 如下之一：
第一生成单元，用于周期性生成指示 BCCH载频的发射功率的取值的消息， 所述消息指示的取值逐渐减小；
第二生成单元， 用于周期性生成指示最小接入电平的取值的消息， 所述消 息指示的取值逐渐增大。
20. 一种用于小区重选的系统， 其特征在于， 包括基站控制器和基站收发 器， 其中：
所述基站控制器， 用于生成指示特定物理量的取值的消息， 所述特定物理 量用于指示小区内处于空闲状态的用户终端选择目标小区， 其中， 在不同时刻， 所述基站控制器生成的所述消息指示的特定物理量的取值不同； 所述基站控制 器还用于向所述基站收发器发送所述消息；
所述基站收发器， 用于在不同时刻， 从所述基站控制器接收所述消息； 所 述基站收发器还用于根据所述消息中指示的特定物理量的取值改变所述特定物 理量的取值， 以使所述小区内处于空闲状态的用户终端根据所述特定物理量的 取值分批选择到邻小区。
PCT/CN2012/075770 2011-05-27 2012-05-19 用于小区重选的方法、基站收发器、基站控制器及系统 WO2012163230A1 (zh)

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