WO2015123935A1 - Procédé d'équilibrage de charges, dispositif et support de stockage informatique - Google Patents

Procédé d'équilibrage de charges, dispositif et support de stockage informatique Download PDF

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Publication number
WO2015123935A1
WO2015123935A1 PCT/CN2014/078836 CN2014078836W WO2015123935A1 WO 2015123935 A1 WO2015123935 A1 WO 2015123935A1 CN 2014078836 W CN2014078836 W CN 2014078836W WO 2015123935 A1 WO2015123935 A1 WO 2015123935A1
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WIPO (PCT)
Prior art keywords
base station
type
cio
user terminal
message
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PCT/CN2014/078836
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English (en)
Chinese (zh)
Inventor
刘俊强
刘柳
王珂
常永宇
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中兴通讯股份有限公司
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Publication of WO2015123935A1 publication Critical patent/WO2015123935A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/086—Load balancing or load distribution among access entities
    • H04W28/0861—Load balancing or load distribution among access entities between base stations
    • H04W28/0864—Load balancing or load distribution among access entities between base stations of different hierarchy levels, e.g. Master Evolved Node B [MeNB] or Secondary Evolved node B [SeNB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to communication technologies, and in particular, to a load balancing method, apparatus, and computer storage medium between base stations in a heterogeneous network. Background technique
  • Heterogeneous network refers to a base station (LNB, Low Power NodeB), and a user equipment (UE, User Equipment) in a macro cellular network formed by an original macro base station (MNB, Macro NodeB) and its service users.
  • LNB Low Power NodeB
  • UE User Equipment
  • the transmit power of each base station is the same, and the user terminal selects the serving base station according to the received downlink pilot power strength, and there is no problem of uplink and downlink imbalance.
  • the LNBs with different transmit powers and MNBs are introduced, and the transmit power of each base station in the downlink direction is no longer the same, while the uplink direction is the power transmitted by the receiving user terminal, so the downlink coverage boundary is further Close to the LNB, and the upstream coverage boundary is in the middle of the MNB and LNB.
  • the user terminal selects the serving base station according to the conventional method at this time, that is, the method of receiving the pilot strength of each base station is compared, even if the user terminal is closer to the LPN, the user terminal may select the macro base station as its serving base station.
  • These user terminals are located between the uplink coverage boundary and the downlink coverage boundary, and this area is called an imbalance area. As shown in FIG. 1, this area is further divided into a part of the area close to the macro base station, and the above-mentioned line coverage boundary and soft handover boundary are bounded.
  • the user terminal in this area is a macro base station user terminal, but the path to the micro base station.
  • the loss is smaller, so in order for the macro base station to receive and demodulate the signals of these user terminals, the transmission of these user terminals
  • the power is large, causing large uplink interference to the base station.
  • a part of the area close to the base station is between the downlink coverage boundary and the soft handover boundary, and the user terminals in the area are served by the macro base station, but the micro base station is also in the activation set of the user terminals, and the micro base station can serve these users.
  • the terminal performs power control to reduce the transmission power of these user terminals to avoid too much uplink interference, but the reduction of the transmission power reduces the reception quality of the signals of these user terminals at the macro station.
  • the reduction in channel reception quality especially the degradation of the uplink control channel reception quality, greatly affects the performance of the system.
  • the load of the macro base station is greater than the load of the micro base station, but in some cases, the load of the micro base station is also greater than the load of the macro base station, for example, the macro base station covers one factory, and another one: base station Cover an auditorium.
  • the macro base station covers one factory, and another one: base station Cover an auditorium.
  • the load of the micro base station covering the auditorium was much higher than the load of the macro base station covering the factory.
  • the path loss of the newly added micro base station users to the micro base station is smaller than that of the macro station, since the micro base station is overloaded, the authorization that each user terminal can allocate is small, and the user terminal can transmit.
  • the power is small, and the signal to interference plus noise ratio (SINR) of the signal received by the micro base station is small.
  • SINR signal to interference plus noise ratio
  • a macro base station is located on a small hill, which is responsible for covering several surrounding villages. Each village has a micro base station. During the day, people out of the village to work in the field, the macro base station has a higher load, and the micro base station has a lower load. On the contrary, in the evening, people return to the village, the load of the macro base station is reduced, and the load of each micro base station is increased. At this time, some base station users should be offloaded to the macro base station.
  • the above examples have all demonstrated that real-time load control is required due to significant changes in user distribution over time.
  • the main load controls in WCDMA systems are: admission control, load balancing control, data scheduling, and congestion control.
  • Admission control refers to the system root when a user establishes a new call or handover in a cell. The user is allowed to enter the system based on the current load situation and predicting the user entering the post load. This protects the normal operation of the system, but it is unfair to those who are new to the call and unable to get service.
  • the load balancing control method of the same carrier frequency is the breathing effect, which means that when the cell base station is overloaded, the transmitting power of the base station can be reduced, the coverage of the base station can be reduced, and some users can be offloaded to the neighboring area.
  • the transmit power of the micro base station is originally small, if it continues to decrease Its transmit power will increase the system's uplink and downlink imbalance. Therefore, the overload of the micro base station in the heterogeneous network is not suitable for the respiratory effect.
  • Data scheduling is to improve the utilization of cell resources.
  • the Packet Scheduling technology is introduced to reduce or increase the throughput of best-effort (BE) services when the rate of uncontrollable traffic in the cell is too large or too small.
  • BE best-effort
  • Data scheduling is a high-level load control and can impair the transmission performance of some BE services.
  • the main processing method of congestion control is to guarantee some high-priority services and suspend some low-priority services. It belongs to the high-level load management. And, we hope to avoid congestion as much as possible.
  • load balancing control is a method that achieves load balancing and does not affect the performance of other services, so that the overall performance of the system is the best.
  • load balancing control and breathing effects cannot solve the overload of the micro base station in the heterogeneous network.
  • the embodiments of the present invention provide a load balancing method, a device, and a computer storage medium between base stations in a heterogeneous network, which can prevent the load control technology in the related technology from affecting service performance or increase uplink and downlink imbalance in a heterogeneous network.
  • the problem can prevent the load control technology in the related technology from affecting service performance or increase uplink and downlink imbalance in a heterogeneous network.
  • a load balancing method is applied to a target base station in a first type of base station and a second type of base station in a heterogeneous network, where a transmit power of the first type of base station is greater than the second The transmitting power of the type of the base station, the at least one of the second type of base stations is located in the coverage of the first type of base station, and the method includes:
  • the target base station When the target base station is overloaded, perform a cell-specific offset (CIO) control operation, where the CI0-related control operation is used to select at least one user terminal currently served by the target base station.
  • CIO cell-specific offset
  • the base station serves as a serving base station, and the base station selected by the user terminal is a base station other than the target base station among the first type base station and the second type base station.
  • the CI0 related control operation includes: reducing a cell individual offset CI0, and serving the user terminal of the second type of base station, and an active set
  • the user terminal including the second type of base station sends a CI0 reduction message, where the CI0 reduction message is used to control the user terminal that receives the CI0 reduction message to determine the reduced CI0 value, and according to the reduced
  • the CI0 value selects the serving base station;
  • the CI0 related control operation includes: sending a CI0 increase request to the second type of base station within the coverage of the target base station, where the CI0 increase request is used And causing the second type of base station that receives the CI0 increase request to increase CI0, and sending a CI0 increase message to the user terminal served by the second type of base station and the user terminal including the second type of base station in the active set.
  • the CI0 increase message is used to control the user terminal that receives the CI0 increase message to determine the increased CI0 value, and to select the serving base station according to the increased CI0 value.
  • the sending the CI0 increase request to the second type of base station in the coverage of the target base station includes:
  • a CI0 increase request is sent by the radio network controller to a second type of base station within the coverage of the target base station.
  • the sending the CIO message to the user terminal that is served by the second type of base station, and the user terminal that includes the second type of base station in the activation set includes:
  • a CIO message is sent to a user terminal serving the second type of base station by a primary common control physical channel, and a user terminal including the second type of base station in an activation set.
  • the sending the CIO message to the user terminal that serves the second type of base station by using the primary common control physical channel, and the user terminal that includes the second type of base station in the activation set includes:
  • the CIO message is sent to the user terminal served by the second type of base station and the user terminal including the second type of base station in the active set by the last 256 chips of the last slot in the primary common control physical channel.
  • the CIO related control operation further includes increasing noise filling (NP, Noise Padding);
  • the CIO related control operation further includes: sending an NP reduction request to the second type of base station within the coverage of the target base station, where the NP reduction request is used for The second type of base station within the coverage of the target base station is reduced by NP.
  • the heterogeneous network is a high speed uplink packet access heterogeneous network.
  • the embodiment of the invention further provides a load balancing device, including:
  • the determining module is configured to determine whether the target base station is overloaded, the target base station is a target base station in the first type of base station and the second type of base station in the heterogeneous network, and the transmit power of the first type of base station is greater than the second Transmit power of the type base station, at least one of the second type of base stations exists in the coverage of the first type of base station;
  • An execution module configured to perform a CIO-related control operation when the target base station is overloaded, where the CIO-related control operation is configured to enable at least one user terminal currently served by the target base station to select one base station as the serving base station, And the base station selected by the user terminal is a base station other than the target base station in the first type of base station and the second type of base station.
  • the execution module comprises: The adjusting unit is configured to: when the target base station is the second type of base station, reduce the cell individual offset CIO;
  • a first sending unit configured to send a CIO reduction message to a user terminal serving the second type of base station, and a user terminal in the activation set including the second type of base station, where the CIO reduction message is used to control receiving
  • the user terminal that describes the CIO reduction message determines the reduced CIO value, and selects the serving base station according to the reduced CIO value;
  • a second sending unit configured to send, to the second type of base station in the coverage of the target base station, a CIO increase request, where the target base station is a first type of base station, where the CIO increase request is used to enable receiving
  • the second type of base station of the CIO increase request increases the CIO, and sends a CIO increase message to the user terminal served by the second type of base station and the user terminal including the second type of base station in the active set, the CIO increase
  • the large message is used to control the user terminal that receives the CIO increase message to determine the increased CIO value, and select the serving base station according to the increased CIO value.
  • the second sending unit is further configured to send, by the radio network controller, a CIO increase request to the second type of base station in the coverage of the target base station.
  • the first sending unit is further configured to send a CIO message to a user terminal serving the second type of base station by using a primary common control physical channel, and a user terminal including the second type of base station in an activation set.
  • the first sending unit is further configured to: the user terminal serving the second type of base station by using the last 256 chips of the last slot in the primary common control physical channel, and the activation set including the first The user terminal of the second type of base station sends a CIO message.
  • the adjusting unit is further configured to increase P when the target base station is a second type of base station;
  • the second sending unit is further configured to: when the target base station is the first type of base station, send an NP reduction request to the second type of base station in the coverage of the target base station, where the NP reduction request is used to make the The second type of base station within the coverage of the target base station reduces the NP.
  • the heterogeneous network is a high speed uplink packet access heterogeneous network.
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the load balancing method described above.
  • the technical solution provided by the embodiment of the present invention is directed to the problem of unbalanced load between base stations in a heterogeneous network, in particular, the problem of load imbalance between base stations caused by distribution changes of user terminals, by adjusting low in heterogeneous networks.
  • the CIO of the power base station implements load balancing between the base stations in the heterogeneous network, and avoids the problem that the load control method in the related technology affects the service performance of the technology or increases the uplink and downlink imbalance in the heterogeneous network.
  • Figure 1 is a schematic diagram of uplink and downlink imbalance in a heterogeneous network
  • FIG. 2 is a flow chart of a method for load balancing between base stations in a heterogeneous network according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of the impact of modifying a CIO value on a heterogeneous network in a heterogeneous network
  • FIG. 4 is a frame structure of a main common control physical channel
  • FIG. 5 is a flowchart of a load balancing device between base stations in a heterogeneous network according to an embodiment of the present invention
  • FIG. 6 is a flowchart of an overload processing procedure for a micro base station in an HSUPA heterogeneous network
  • FIG. 7 is a macro base station in an HSUPA heterogeneous network. Flowchart for performing an overload processing procedure
  • FIG. 8 is a flow chart of a load balancing process for a micro base station and a macro base station in an HSUPA heterogeneous network.
  • the inventors have found in the process of implementing the present invention that among the above various methods provided by the related art, Only load balancing control is the best way to achieve load balancing and improve the overall performance of the system without affecting other service performance.
  • load balancing control and breathing effects cannot solve micro base station overload in heterogeneous networks.
  • the respiratory effect may reduce the transmission power of the micro base station and cause an increase in uplink and downlink imbalance in the heterogeneous network.
  • the embodiments of the present invention describe a method, a device, and a computer storage medium for load balancing between base stations, which can implement load balancing between base stations in a heterogeneous network by adjusting CIOs of low-power base stations in a heterogeneous network.
  • FIG. 2 is a flowchart of a method for load balancing between base stations in a heterogeneous network according to an embodiment of the present disclosure, where the load balancing method is applied to a target base station in the heterogeneous network, where the heterogeneous network includes a first type of base station.
  • the transmit power of the first type of base station is greater than the transmit power of the second type of base station, and at least one of the second type of base stations exists in the coverage of the first type of base station, as shown in FIG. 2
  • the method includes the following steps:
  • Step S200 Determine whether the target base station has an overload.
  • Step S202 When there is an overload, perform a cell-specific bias CIO related control operation.
  • the CIO-related control operation is used to enable at least one user terminal currently served by the target base station to select one base station as a serving base station, and the base station selected by the user terminal is the first type of base station and the second type of base station.
  • CIO means that when the user terminal performs cell selection, the received pilot signal strength of each cell is compared with the corresponding cell individual offset to compare, and when the CIO value of a certain cell increases, the user is increased.
  • the terminal selects the probability of the cell. When the CIO value of a certain cell is decreased, the probability that the user terminal selects the cell is reduced.
  • the target base station determines whether there is an overload, and when the target base station is overloaded, performs a CIO-related control operation, so that at least one user terminal currently served by the target base station is according to the CIO.
  • the related control operation selects a base station as the serving base station, and the base station selected by the target base station is a base station other than the target base station in the first type of base station and the second type of base station, thereby reducing the current target base station Service
  • the number of user terminals of the service achieves the purpose of offloading the target base station.
  • the CIO related control operations may include: reducing a cell individual offset CIO, and serving the user terminal of the second type of base station, and an active set a user terminal including the second type of base station sends a CIO reduction message, where the CIO reduction message is used to control a user terminal that receives the CIO reduction message to determine a reduced CIO value, and according to the reduced The CIO value is selected as the serving base station;
  • the CIO related control operation may include: sending a CIO increase request to the second type of base station within the coverage of the target base station, the CIO The increase request is for causing the second type of base station that receives the CIO increase request to increase the CIO, and send the user terminal that serves the second type of base station and the user terminal that includes the second type of base station in the active set a CIO increase message, the CIO increase message is used to control a user terminal that receives the CIO increase message
  • the CIO related control operation may be a user terminal that reduces the cell individual offset CIO and serves the target base station, that is, the second type of base station.
  • a user terminal that includes the second type of base station in the activation set sends a CIO reduction message, to control a user terminal that receives the CIO reduction message to determine a reduced CIO value according to the CIO reduction message, and select a month If the CIO of the second type of base station is reduced, the user terminal receiving the message selects the serving base station, especially for the user terminal in the handover area, and should switch the second type of base station to the service.
  • the handover process delay of the user terminal of the base station ie, the user terminal in the activation set including the second type of base station
  • the second type of base station serving user terminal continues to increase
  • User terminal in the user terminal tends to switch the other base station to the user terminal of the serving base station
  • the second type of base station that is, the purpose of offloading the load of the second type of base station is achieved.
  • the CIO related control operation may be to send a CIO to the second type of base station within the coverage of the target base station. Soliciting, so that the second type of base station receiving the CIO increase request increases the CIO, and sends a CIO increase to the user terminal served by the second type of base station and the user terminal including the second type of base station in the active set.
  • the CIO increase message is used to control the user terminal (ie, the user terminal that receives the CIO increase message) to determine the increased CIO value according to the CIO increase message, according to the increased CIO value.
  • Selecting a serving base station, the user terminal served by the second type of base station, and the user terminal including the second type of base station receiving the CIO are received because the CIO of the second type of base station in the coverage of the first type of base station is increased.
  • Increasing the message, especially for the user terminal in the handover area, that is, the user terminal currently served by the first type of base station, tends to switch the second type of base station within the coverage of the first type of base station to the user of the serving base station.
  • the terminal (that is, the current serving base station is the first type of base station and the active set includes the user terminal of the second type of base station) is in the handover area
  • the handover procedure can be made in advance, thus reducing the first type base stations which service a user terminal, i.e. the load to achieve the object of the first type base stations will be unloaded.
  • the signal coverage of the first type of base station A includes a second type of base station Al, a second type of base station A2, and a second type of base station A3.
  • the base station A1 When the base station A1 is overloaded, the CIO value of the base station A1 is reduced, and the CIO value reduction message is sent to the base station A1 serving user terminal and the user terminal including the base station A1 in the activation set.
  • the base station For the base station A1 to serve the user terminal, the base station is used.
  • a user terminal serving as the serving base station after receiving the message that the CIO value of the base station A1 is reduced, selects its serving base station according to the message, so that some user terminals select other base stations as their serving base stations, for the active set.
  • the user terminal including the base station A1 after receiving the message that the CIO value of the base station A1 is reduced, when selecting the serving base station, causes some user terminals to avoid selecting the base station A1 as its serving base station, thereby implementing the base station A1.
  • the base station A When the base station A is overloaded, the base station A sends a CIO increase request to the base station A1, the base station A2, and the base station A3. After receiving the request, the base station A1 increases the CIO value of the base station A1, and serves the base station A1.
  • the user terminal and the user terminal in the activation set including the base station A1 send a message that the CIO is increased.
  • the user terminal that receives the message includes: the user terminal that is served by the base station A of the base station A1 in the activation set, that is, the base station A is currently used. Serving the base station and the active set includes the user terminals of the base station A1.
  • the user terminals After receiving the CIO increase message of the base station A1, the user terminals select their service base stations according to the message, thereby causing the serving base stations of some user terminals to change from the base station A. For the base station A1, the base station A is unloaded. Similarly, after receiving the CIO increase request, the base station A2 and the base station A3 perform similar operations to achieve the purpose of offloading the base station A.
  • the macro station shown in the figure is the first type of base station with higher transmit power
  • the micro station is the second type of base station with lower transmit power.
  • the micro station is located within the signal coverage of the macro station.
  • the CIO value of the micro station is OdB
  • the downlink coverage boundary point is located at point A. If the macro station is overloaded at this time, it is necessary to adjust the CIO value of the micro station within the signal coverage of the macro station to increase the micro station.
  • the CIO value for example, increases by 3dB.
  • the downlink coverage boundary point will move to the macro station by 3dB, which is located at point B, thereby increasing the service area of the station, and reducing the service area of the corresponding macro station.
  • the macro station is offloaded to the station, and the uplink interference generated by the edge user terminal of the macro station to the station is weakened. Since, in this process, the transmit power of the macro station or the micro station is not adjusted, the uplink and downlink imbalance in the heterogeneous network is not increased.
  • the sending, by the second type of base station in the coverage of the target base station, the CIO increase request may be implemented by: performing, by the wireless network controller, a second coverage within the coverage of the target base station The type base station sends a CIO increase request.
  • the radio network controller (RNC, Radio Network Controller) sends an increase to all the second type of base stations in the signal coverage of the first type of base station.
  • the request of the CIO that is, the CIO increase request is sent by the RNC to the second type of base station within its signal coverage.
  • the user terminal and the activation set serving the second type of base station include The user terminal of the second type of base station sends a CIO message, which can be implemented by: sending a CIO message to a user terminal serving the second type of base station by using the primary common control physical channel and a user terminal including the second type of base station in the activation set. .
  • the second type of base station needs to send a CIO message to the user terminal, and the user terminal includes not only the second type of base station serving user terminal (that is, the second type of base station is selected as the user terminal of the serving base station), The user terminal including the second type of base station is also activated in the active set. Therefore, the message can be sent to the user terminals through the primary common control physical channel, that is, the CIO message of the second type of base station is carried by the primary common control physical channel.
  • the sending of the CIO message to the user terminal serving the second type of base station by using the primary common control physical channel and the user terminal including the second type of base station in the activation set may be implemented by: The last 256 chips of the last time slot in the physical channel send a CIO message to the user terminal served by the second type of base station and the user terminal including the second type of base station in the active set.
  • FIG. 4 is a frame structure of a main common control physical channel.
  • CIO indicator CIO indicator
  • NP Noise Padding
  • NP is a user terminal of a base station serving user terminal that receives the uplink interference of the receiving antenna of the base station when it is subjected to uplink interference of the other base station serving user terminal.
  • the SINR of the uplink signal is decreased.
  • the base station needs to increase the transmission power of the user terminal, and since the transmission power of the other base station serving the user terminal does not change, the other base station serves the user.
  • the uplink interference of the base station serving user is reduced.
  • NP can be used with CIO.
  • the CIO related control operation may further include: increasing an NP; when the target base station is a first type of base station, the CIO related control operation The method may further include: transmitting an NP reduction request to the second type of base station within the coverage of the target base station, where the NP reduction request is used to reduce the NP of the second type of base station that receives the NP reduction request.
  • the NP of the second type of base station when a certain type of base station increases CIO, the NP of the second type of base station can be reduced at the same time, and when a certain type of base station decreases CIO, the second type can be increased at the same time.
  • the NP of the base station when a certain type of base station increases CIO, the NP of the second type of base station can be reduced at the same time, and when a certain type of base station decreases CIO, the second type can be increased at the same time.
  • the CIO of the overloaded second type of base station may be reduced, so that the user terminal served by the second type of base station selects the serving base station according to the CIO reduction message of the second type of base station,
  • the above object can be achieved by increasing the NP of the second type of base station;
  • the overloaded base station is the first type of base station, the overloaded a CIO of a second type of base station within a coverage of a type of base station, such that the first type of base station serving user terminal selects a serving base station according to a CIO increase message of the corresponding second type of base station, thereby reducing users of the first type of base station service
  • the terminal meanwhile, can reduce the NP of the second type of base station within the coverage of the overloaded first type of base station to achieve the above object.
  • the heterogeneous network is a high speed uplink packet access heterogeneous network.
  • the embodiment of the invention further describes a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the load balancing method described in FIG.
  • the embodiment of the present invention further describes a load balancing device 50 between base stations in a heterogeneous network. As shown in FIG. 5, the device 50 includes:
  • the determining module 51 is configured to determine whether the target base station is overloaded, the target base station is a target base station in the first type of base station and the second type of base station in the heterogeneous network, and the transmit power of the first type of base station is greater than the first Transmit power of two types of base stations, coverage of the first type of base station There is at least one of the second type of base stations within the cover;
  • the execution module 52 is configured to perform a CIO-related control operation when the target base station is overloaded, where the CIO-related control operation is used to enable at least one user terminal currently served by the target base station to select one base station as the serving base station, and
  • the base station selected by the user terminal is a base station other than the target base station among the first type of base station and the second type of base station.
  • the execution module includes (not shown in FIG. 5):
  • An adjusting unit configured to: when the target base station is a second type of base station, reduce a cell individual offset CIO;
  • a first sending unit configured to send a CIO reduction message to a user terminal serving the second type of base station, and a user terminal in the activation set including the second type of base station, where the CIO reduction message is used to control receiving
  • the user terminal that describes the CIO reduction message determines the reduced CIO value, and selects the serving base station according to the reduced CIO value;
  • a second sending unit configured to: when the target base station is a first type of base station, send a CIO increase request to a second type of base station in a coverage area of the target base station, where the CIO increase request is used to enable receiving
  • the second type of base station of the CIO increase request increases CIO
  • the increase message is used to control the user terminal receiving the CIO increase message to determine the increased CIO value, and select the serving base station according to the increased CIO value.
  • the second sending unit is further configured to send a CIO increase request to the second type of base station in the coverage of the target base station by using the radio network controller.
  • the first sending unit is further configured to send a CIO message to the user terminal serving the second type of base station by using the primary common control physical channel, and the user terminal including the second type of base station in the activation set.
  • the adjusting unit is further configured to increase an NP when the target base station is a second type of base station;
  • the second sending unit is further configured to: when the target base station is the first type of base station, send an NP reduction request to the second type of base station in the coverage of the target base station, where the NP reduction request is used to make The second type of base station within the coverage of the target base station reduces the NP.
  • the heterogeneous network may be a high speed uplink packet access heterogeneous network.
  • the load balancing device 50 can be disposed in the target base station, and the determining module 51 and the executing module 52 can be implemented by a central processing unit (CPU) in the load balancing device 50, and a digital signal processor (DSP, Digital Signal Processor). ) or Field Programmable Gate Array (FPGA) implementation.
  • CPU central processing unit
  • DSP Digital Signal Processor
  • FPGA Field Programmable Gate Array
  • the embodiment of the present invention also describes a process of performing overload processing on a base station in an HSUPA heterogeneous network.
  • the number of user terminals of a certain base station is continuously increased, which may cause overload of the micro base station
  • FIG. 6 A flow chart for performing an overload processing procedure on a base station in an HSUPA heterogeneous network, as shown in FIG. 6, the processing procedure includes the following steps:
  • step S600 it is determined whether the base station is overloaded. If the base station is overloaded, the process goes to step S602, otherwise, the process goes to step S606.
  • the overload of the base station is divided into an uplink overload or a downlink overload.
  • the downlink overload situation when the micro base station serves the user terminal, the path loss of the user terminal of the micro base station to the edge of the signal coverage is the largest, therefore, The data transmission of the edge user terminal will be congested first.
  • the congestion can be detected by the downlink data buffer located at the base station. Therefore, it can be determined whether the micro base station has a downlink overload according to the downlink congestion status of the edge user terminal.
  • the uplink overload situation When the number of user terminals of the base station increases, since the base noise rise value of the base station is substantially fixed, the transmit power allowed by each user terminal decreases as the number of user terminals increases, and the micro base station allocates each user terminal.
  • the authorization is reduced, and the SINR value of the uplink signal received by the micro base station is reduced, so that the user terminal can only use the lower connection modulation, and the transmission rate becomes lower, which eventually causes congestion of the uplink data buffer of the user terminal, thereby causing uplink.
  • Overload so it can be used according to the edge
  • Step S602 detecting whether the CIO value of the current micro base station satisfies a preset condition, if yes, proceeding to step S604, otherwise proceeding to step S606.
  • the CIO value has a certain value range, when adjusting the CIO value of the base station, care must be taken not to make the CIO value exceed the preset range.
  • the CIO value is greater than or equal to OdB and less than or equal to 6 dB.
  • Step S604 reducing the CIO value of the micro base station and increasing the NP value of the base station.
  • the micro base station Decrease the CIO value of the base station, so that the micro base station sends a CIO value reduction message to the relevant user terminal, and increases the NP value; in this step, the CIO value of the base station can be reduced by ldB, so that the base station serves the user terminal to the base station and
  • the activation set includes a user terminal of the base station to send a message to inform the user terminals that the CIO value of the base station is decreased by ldB, and at the same time, the NP value can be incremented by one at the base station.
  • step S606 the original CIO value and the NP value are maintained.
  • the embodiment of the present invention also describes a process of performing overload processing on a macro base station in an HSUPA heterogeneous network.
  • the number of user terminals of a macro base station is continuously increased, which may cause overload of the macro base station.
  • the signal coverage of the macro base station includes two micro base stations, which are a base station B1 and a micro base station B2, and
  • FIG. 7 is a flowchart of an overload processing process for the macro base station in the HSUPA heterogeneous network, as shown in FIG. The process includes the following steps:
  • Step S700 Determine whether the macro base station is overloaded. If it is overloaded, proceed to step S702. Otherwise, continue to determine whether the macro base station is overloaded (other operations may not be performed).
  • the overload of the macro base station is divided into an uplink overload or a downlink overload, and the method for determining the uplink overload of the macro base station and the method for determining the downlink overload are similar to the method for determining the overload of the micro base station.
  • Step S702 the macro base station sends a CIO increase request to the micro base station B1 and the micro base station B2 in its coverage area.
  • the macro base station can cover the signal of the macro base station by the radio network controller.
  • the base station in the range sends a request for the CIO to increase the ldB.
  • Step S704 the base station B1 detects whether the CIO value meets the preset condition, and if yes, proceeds to step S708, otherwise proceeds to step S712.
  • Step S706 the base station B2 detects whether the CIO value meets the preset condition, and if yes, proceeds to step S710, otherwise proceeds to step S712.
  • Step S708 increasing the CIO value of the micro base station B1 while reducing the NP value of the base station B1.
  • the macro base station serving user terminal including the micro base station B1 transmits a message to inform the user terminals that the CIO value of the base station B1 is increased by ldB, and at the base station B1, the NP value can be decremented by one.
  • Step S710 increasing the CIO value of the micro base station B2 while reducing the NP value of the micro base station B2.
  • the macro base station serving user terminal including the micro base station B2 transmits a message to inform the user terminals that the CIO value of the base station B2 is increased by ldB, and at the base station B2, the NP value can be decremented by one.
  • step S712 the original CIO value and the NP value are maintained.
  • the embodiment of the present invention further describes a process of performing load on a macro base station and a base station in an HSUPA heterogeneous network.
  • the HSUPA heterogeneous network there is a macro base station, where the signal coverage of the macro base station includes two micro base stations, respectively
  • the micro base station B 1 and the micro base station B2 may overload the other base stations in the heterogeneous network due to overloading of any base station in the heterogeneous network. Therefore, it is necessary to repeatedly perform load balancing of the base station. method.
  • FIG. 8 is a flowchart of a load balancing process for a micro base station and a macro base station in a HSUPA heterogeneous network. As shown in FIG. 8, the process includes the following steps:
  • Step S800 determining whether the micro base station B1 is overloaded, if it is overloaded, proceeding to step S802, Then, the process proceeds to step S806.
  • Step S802 detecting whether the CIO value of the base station Bl satisfies a preset condition, if yes, proceeding to step S804, otherwise proceeding to step S806.
  • Step S804 reducing the CIO value of the base station B1 and increasing the NP value of the base station B1.
  • the CIO value of the base station B1 is reduced, so that the base station B1 sends a CIO value reduction message to the relevant user terminal, and increases the NP value.
  • the CIO value of the base station B1 can be reduced by the IdB, so that the micro base station B1 is micro-
  • the base station B1 serves the user terminal and the user terminal including the micro base station B1 in the activation set to send a message, and informs the user terminals that the CIO value of the base station B1 is decreased by ldB, and at the micro base station B1, the NP value can be increased by 1, thereby The offloading of the micro base station B1 is implemented.
  • the partial base station B1 serves the user terminal to be offloaded to the macro base station to which the base station B1 belongs, so that the number of macro base station service user terminals increases.
  • Step S806 it is judged whether the macro base station is overloaded. If it is overloaded, the process proceeds to step S808, otherwise, the process proceeds to step S800 and step S818.
  • Step S808 the macro base station sends a CIO increase request to the base station B1 and the base station B2 in its coverage.
  • the macro base station may send a CIO request for increasing the IdB by the radio network controller to the base station within the signal coverage area of the macro base station.
  • Step S810 the micro base station B1 detects whether the CIO value meets the preset condition, and if yes, proceeds to step S814, otherwise proceeds to step S800.
  • Step S812 the micro base station B2 detects whether the CIO value meets the preset condition, and if yes, proceeds to step S816, otherwise proceeds to step S818.
  • Step S814 increasing the CIO value of the micro base station B1 while reducing the NP value of the base station B1, and then proceeding to step S800.
  • step S800 Increasing the CIO value of the base station B, so that the base station B1 sends a CIO increase message to the relevant user terminal, and reduces the NP value, and proceeds to step S800; in this step, the CIO value of the base station B1 can be increased by ldB, thereby causing the base station to B1 includes the base station B1 in the active set
  • the macro base station serves the user terminal to send a message to inform the user terminals that the CIO value of the micro base station B1 is increased by ldB, and at the same time, the NP value can be decremented by one at the micro base station B1.
  • This step may cause the number of serving user terminals of the base station B1 to increase. Therefore, the micro base station B1 is overloaded again, so it is necessary to perform the uninstall process again for the micro base station B1.
  • the CIO value of the base station B2 can be increased by ldB, so that the micro base station B2 is activated.
  • the macro base station serving user terminal including the micro base station B2 transmits a message to inform the user terminals that the CIO value of the base station B2 is increased by ldB, and at the base station B2, the NP value can be decremented by one.
  • Step S818 it is judged whether the base station B2 is overloaded. If it is overloaded, the process goes to step S820, otherwise, the process goes to step S806.
  • step S820 it is detected whether the CIO value of the base station B2 meets the preset condition. If the CIO value satisfies the preset condition, the process goes to step S822, otherwise the process goes to step S806.
  • Step S822 reducing the CIO value of the micro base station B2, so that the micro base station B2 sends a CIO value reduction message to the relevant user terminal, and increases the NP value of the base station B2, and proceeds to step S806.
  • the macro base station, the micro base station B1, and the micro base station B2 in the heterogeneous network are not overloaded.
  • embodiments of the invention may be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware aspects. Moreover, the invention can take the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps that are configured to implement the functions specified in one or more blocks of the flowchart or in a block or blocks of the flowchart.
  • the target base station determines whether there is an overload; when there is an overload, performs a cell-specific bias CIO-related control operation, and the problem that the load between the base stations in the heterogeneous network is unbalanced, especially by the user terminal
  • the problem of unbalanced load between base stations caused by the change, the load balancing between the base stations in the heterogeneous network is realized by adjusting the CIO of the low-power base station in the heterogeneous network, and the load control method in the related art is avoided. Affects service performance or increases the imbalance between uplink and downlink in heterogeneous networks.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Conformément à des modes de réalisation, la présente invention concerne un procédé d'équilibrage de charges, un dispositif et un support de stockage informatique entre des stations de base dans un réseau hétérogène. Le procédé d'équilibrage de charges peut être appliqué à une station de base cible dans un premier type de stations de base et un second type de stations de base dans le réseau hétérogène. La puissance de transmission du premier type de stations de base est plus grande que celle du second type de stations de base et au moins une station de base du second type est située dans la plage de couverture de la station de base du premier type. Le procédé consiste : à déterminer si une surcharge se produit ou non, et si la surcharge se produit, à mettre en œuvre une opération de commande associée à un décalage individuel de cellule (CIO), l'opération de commande associée au CIO étant utilisée pour amener au moins un terminal utilisateur actuellement desservi par la station de base cible à sélectionner une station de base comme station de base de service, la station de base sélectionnée par le terminal utilisateur étant une station de base à l'exception de la station de base cible dans le premier type de stations de base et le second type de stations de base.
PCT/CN2014/078836 2014-02-20 2014-05-29 Procédé d'équilibrage de charges, dispositif et support de stockage informatique WO2015123935A1 (fr)

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CN106658619B (zh) * 2015-11-03 2019-09-20 大唐移动通信设备有限公司 一种小区配置优化的方法、基站及系统
CN107222877A (zh) * 2016-03-21 2017-09-29 中兴通讯股份有限公司 Cio调整方法和装置

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Publication number Priority date Publication date Assignee Title
US20120140656A1 (en) * 2010-12-03 2012-06-07 Wigren Torbjoern Method and Arrangement for Load Management in Heterogeneous Networks with Interference Suppression Capable Receivers
CN102625370A (zh) * 2012-04-20 2012-08-01 重庆邮电大学 基于网络联合效用优化及负载均衡的异构网络垂直切换方法
CN103037455A (zh) * 2012-12-29 2013-04-10 华中科技大学 一种lte网络中mlb和mro的联合优化方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120140656A1 (en) * 2010-12-03 2012-06-07 Wigren Torbjoern Method and Arrangement for Load Management in Heterogeneous Networks with Interference Suppression Capable Receivers
CN102625370A (zh) * 2012-04-20 2012-08-01 重庆邮电大学 基于网络联合效用优化及负载均衡的异构网络垂直切换方法
CN103037455A (zh) * 2012-12-29 2013-04-10 华中科技大学 一种lte网络中mlb和mro的联合优化方法

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