WO2013037311A1 - 用于降低小区间信号干扰的方法、基站及无线通信系统 - Google Patents

用于降低小区间信号干扰的方法、基站及无线通信系统 Download PDF

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Publication number
WO2013037311A1
WO2013037311A1 PCT/CN2012/081417 CN2012081417W WO2013037311A1 WO 2013037311 A1 WO2013037311 A1 WO 2013037311A1 CN 2012081417 W CN2012081417 W CN 2012081417W WO 2013037311 A1 WO2013037311 A1 WO 2013037311A1
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WIPO (PCT)
Prior art keywords
base station
radio resource
coordinated
user equipment
serving base
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PCT/CN2012/081417
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English (en)
French (fr)
Inventor
蔺波
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP12831843.3A priority Critical patent/EP2755434B1/en
Publication of WO2013037311A1 publication Critical patent/WO2013037311A1/zh
Priority to US14/205,809 priority patent/US9237577B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/20Performing reselection for specific purposes for optimising the interference level
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/27Control channels or signalling for resource management between access points

Definitions

  • the present invention relates to communication technologies, and in particular, to a method, a base station, and a wireless communication system for reducing inter-cell signal interference. Background of the invention
  • small base stations In order to further increase the system capacity, more low-power access points or small base stations (hereinafter collectively referred to as small base stations) can be introduced in the macro base station range.
  • An access point such as a remote radio head (RRH).
  • RRH remote radio head
  • the transmit power of the small base station is smaller than the transmit power of the macro base station, and the downlink coverage is much smaller than the downlink coverage of the macro base station.
  • the hybrid networking mode of the macro base station and the small base station can enhance hotspot coverage, indoor blind spot (or weak point) coverage, and macro base station.
  • Cell edge coverage improving cell average throughput, cell edge throughput, cell uplink/downlink spectrum utilization, reducing network cost, and operator's CAPEX (capital expenditure), etc., we call it a heterogeneous network.
  • the small base station may pass through.
  • the UE needs to send Switching. It is found that when the heterogeneous network is switched, the handover failure rate of the UE is high due to interference.
  • the downlink interference of the macro cell to the small cell causes the UE of the small cell to fail to receive the downlink information, or fails, for example, when the UE served by the macro cell moves to the central location of the small cell, because the small cell has downlink interference to the macro cell, The UE that causes the macro cell to receive the downlink information is difficult to fail. For example, because the UE of the small cell has uplink interference to the UE of the macro cell, the macro cell fails to receive the uplink information of the UE and fails.
  • the handovers that need to be made by the UE will be more frequent. Frequent handovers will bring a large amount of signaling and processing load to the network. If the UE is not switched in order to reduce the number of handovers, the UE If the UE is in the small cell, if the UE enters the small cell center, the downlink of the small cell causes strong downlink interference to the UE, causing the UE to drop the call. . Summary of the invention
  • Embodiments of the present invention provide a method, a base station, and a wireless communication system for reducing inter-cell signal interference to reduce signal interference between cells.
  • the embodiment of the present invention provides a method for reducing inter-cell signal interference, including: the serving base station transmitting the user identifier of the served user equipment to the adjacent second base station, and coordinating the radio resource with the second base station, and obtaining the scheduling Determining, by the user identifier, the coordinated radio resource of the user equipment, so that the base station adjacent to the base station of the user equipment that uses the coordinated resource to schedule the user identifier, avoids using the coordinated radio resource;
  • the serving base station uses the coordinated radio resource to schedule a user equipment corresponding to the user identifier.
  • the embodiment of the present invention further provides a method for reducing inter-cell signal interference, including: receiving, by a second base station, a user identifier of a user equipment served by the serving base station sent by a neighboring serving base station, and coordinating radio resources with the serving base station Obtaining a coordinated radio resource of the user equipment corresponding to the user identifier, so that the coordinated radio resource can only be used for the user Identify the scheduling of the corresponding user equipment;
  • the second base station circumvents the use of the coordinated radio resource.
  • the embodiment of the present invention further provides a first base station for reducing inter-cell signal interference, including:
  • a coordination unit configured to send the user identifier of the served user equipment to the adjacent second base station, coordinate the radio resource with the second base station, and obtain the coordinated radio resource of the user equipment corresponding to the user identifier, And causing, by the base station adjacent to the base station of the user equipment that uses the coordinated resource to schedule the user identifier, to avoid using the coordinated radio resource;
  • a scheduling unit configured to schedule, by using the coordinated radio resource, a user equipment corresponding to the user identifier.
  • the embodiment of the present invention further provides a second base station for reducing inter-cell signal interference, including:
  • a coordination unit configured to receive a user identifier of the user equipment that is served by the serving base station, and coordinate the radio resource with the serving base station, to obtain a coordinated radio resource of the user equipment corresponding to the user identifier, So that the coordinated radio resource can only be used for the scheduling of the user equipment corresponding to the user identifier;
  • a resource disabling unit configured to circumvent the use of the coordinated radio resource when the serving base station uses the coordinated radio resource to schedule a user equipment corresponding to the user identifier.
  • the embodiment of the present invention further provides a wireless communication system, including the foregoing first base station for reducing inter-cell signal interference and the second base station for reducing inter-cell signal interference, the first base station and the second base station.
  • the base stations are adjacent.
  • the user base station sends a user identifier to the adjacent second base station, and performs radio resource coordination with the second base station, so that A base station adjacent to a base station of the user equipment corresponding to the user equipment that uses the coordinated resource to schedule the user identifier, avoiding using the coordinated radio resource, so that The coordinated radio resources are not used by neighboring base stations at the same time or at the same time with large power, which effectively reduces signal interference between cells.
  • FIG. 1 is a flowchart of a method for reducing inter-cell signal interference according to an embodiment of the present invention
  • FIG. 2 is a flow chart of another method for reducing inter-cell signal interference according to an embodiment of the present invention
  • FIG. 3 is a flowchart of still another method for reducing signal interference between cells according to an embodiment of the present invention
  • FIG. 4 is a flow chart of still another method for reducing signal interference between cells according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for reducing inter-cell signal interference according to Embodiment 4 of the present invention
  • FIG. 6 is a schematic structural diagram of a first base station for reducing inter-cell signal interference according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a second base station for reducing inter-cell signal interference according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention. Mode for carrying out the invention
  • FIG. 1 is a flowchart of a method for reducing signal interference between cells according to an embodiment of the present invention. As shown in Figure 1, the method includes:
  • Step 11 The serving base station sends the user identifier of the served user equipment to the neighboring second base station, coordinates the radio resource with the second base station, and obtains the coordinated radio resource of the user equipment corresponding to the user identifier. And causing the base station adjacent to the base station of the user equipment corresponding to the user identifier that uses the coordinated resource to schedule the user identifier to circumvent the coordinated radio resource. Avoid using the same time, or reducing power usage, as long as it can be orthogonal from the time domain, frequency domain, code domain or airspace. Or for the same user equipment (UE), the two base stations simultaneously use the coordinated wireless resources for coordinated scheduling.
  • UE user equipment
  • Step 12 The serving base station uses the coordinated radio resource to schedule the user equipment corresponding to the user identifier.
  • the serving base station of the user equipment performs radio resource coordination with the second base station by sending a user identifier to the neighboring second base station, so as to synchronize the user equipment corresponding to the user identifier by using the coordinated resource.
  • the base stations adjacent to the base station circumvent the use of the coordinated radio resources, so that the coordinated radio resources are not simultaneously used by adjacent base stations or used at a large power at the same time, thereby effectively reducing signal interference between cells.
  • the base station may be an eNB, an RNC, or an RRH (a remote radio head).
  • radio resource coordination between the eNBs may be radio resource coordination between the eNB and the RRH.
  • the base station is an eNB.
  • Scheduling the user equipment by using the coordinated radio resource including: scheduling control signaling or data that is sent to the UE; or: scheduling the UE to send uplink signaling or data.
  • Coordinating the radio resources with the second base station may include:
  • the serving base station sends, to the second base station, a coordinated radio resource that schedules the user equipment.
  • the radio resource identifier specifically, the serving base station may obtain the measurement report reported by the user equipment for the second base station cell, and send, to the second base station, information for scheduling the radio resource scheduled to be used by the user equipment, that is, coordination Wireless resources.
  • coordinating the radio resource with the second base station may include:
  • the serving base station sends, to the second base station, service quality information for scheduling a bearer of the user equipment, and scheduling a coordinated radio resource or a radio resource identifier of the user equipment.
  • coordinating the radio resource with the second base station may include:
  • the serving base station receives information of the coordinated radio resource determined by the second base station.
  • coordinating the radio resource with the second base station may include:
  • the serving base station receives one or a combination of the information of the coordinated radio resources determined by the second base station and a coordination result.
  • coordinating the radio resource with the second base station may include:
  • the serving base station receives one or a combination of the information of the coordinated radio resources determined by the second base station and a coordination result.
  • the radio resource identifier may be a radio resource identifier, that is, a correspondence between each radio resource number and corresponding information.
  • the radio resource ID is only used for negotiation.
  • the coordinating parties agree on a radio resource number, the coordinating parties also determine the coordinated radio resources.
  • the coordinating the radio resources with the second base station may further include:
  • the serving base station indicates to the second base station the duration and/or the coordination effective time of occupying the radio resource of the user equipment.
  • coordinating the radio resource with the second base station may further include:
  • the serving base station acquires, according to the message returned by the second base station, a schedulable duration and/or a coordination effective time of the coordinated radio resource.
  • the schedulable duration of the coordinated radio resource may be implicit or explicit, and the implicit use of the coordinated radio resource releases the coordinated radio resource after receiving the release message by the evaded base station;
  • the schedulable duration of the coordinated radio resource is signaled by the base station.
  • the coordinating effective time of the coordinated radio resources may also be implicit or explicit. Implicitly, the serving base station may take effect after receiving the message fed back by the second base station, and the explicit is notified by the second base station by means of signaling.
  • the UE or no longer reduces power usage, coordinates the radio resources to schedule other UEs, i.e., normally uses the coordinated radio resource scheduling UE.
  • the serving base station or the second base station may start a preset timer after the second base station sends or receives a request for coordinating radio resources, that is, the coordination message may not include time information, but the coordination parties have an agreement.
  • the effective time is similar. It can also be that the effective time is not included in the message.
  • the two parties have agreed rules, such as the second base station receiving the message immediately, or the second base station sends the feedback message immediately, or the first base station receives the return. The message takes effect immediately.
  • the process of coordinating radio resources with the second base station further includes: the serving base station transmitting, to the second base station, a cause value for identifying a cause of coordinating radio resources.
  • the method further includes: the serving base station determines not to switch the user equipment corresponding to the user identifier to the second base station.
  • the process may include: according to the moving speed of the user equipment corresponding to the user identifier, or according to the user equipment corresponding to the user identifier, the right information of the cell of the second base station or the second base station non-switchable information, The serving base station determines not to switch the user equipment corresponding to the user identity to the second base station.
  • the moving speed of the user equipment corresponding to the user identifier is obtained according to historical information of the user equipment corresponding to the user identifier.
  • the right information of the cell of the second base station is reported to the serving base station after the user equipment corresponding to the user identifier reads the broadcast message of the second base station.
  • the second base station non-switchable information may specifically be a direct non-switchable indication, or an implicit indication such as a load overload or a high load.
  • the method for reducing inter-cell signal interference may further include: performing an idle state speed assessment, a cell reselection number and a reselection time, or a cell type information or a cell identifier reported by the user equipment, and each The dwell time of the cell is added to the history information of the user equipment.
  • the method further includes:
  • the serving base station sends a handover request message to the second base station, and receives a handover request acknowledgement message of the handover request message returned by the second base station;
  • the method the serving base station sending, by using the coordinated radio resource, a handover command message to a user equipment corresponding to the user identifier.
  • the method further includes: performing a handover preparation operation with the second base station, that is, information sent by the serving base station to the second base station is carried by a handover request message, and the service base station receives The information sent by the second base station is carried by the handover request acknowledgement message.
  • the serving base station sends a target cell identifier and a Radio Resource Control (RRC) context to the second base station by using a handover request message, where the user Historical information of the device, and quality of service information carried by the user equipment.
  • RRC Radio Resource Control
  • the serving base station receives the handover request acknowledgement message returned by the second base station, where the handover request acknowledgement message may carry at least the service quality information of the user equipment and the handover command message sent by the second base station to the user equipment.
  • the handover request acknowledgement message may carry at least the service quality information of the user equipment and the handover command message sent by the second base station to the user equipment.
  • the foregoing handover request message may further carry a pre-handover indication, where the pre-handover indication is used to indicate the second base station, and the handover of the user equipment by the serving base station is completed by a subsequent handover message, or is used to indicate the
  • the second base station waits for a subsequent handover message of the user equipment, or is used to indicate the second base station, and the handover request message is intended to coordinate scheduling. In this way, the second base station does not need to set a timer to decide whether to cancel the handover preparation.
  • the second base station needs to set a timer, and if there is no handover transmission within a predetermined time, the previous handover preparation work is canceled.
  • the method includes: the serving base station sending a handover cancellation message to the second base station, and instructing the second base station to release information about the coordinated radio resource.
  • the method may further include:
  • the serving base station circumvents the use of the coordinated radio resource.
  • a timer may also be started.
  • the method may further include: after receiving, by the serving base station, the information sent by the second base station to the serving base station to release the coordinated radio resource, releasing the Coordinating radio resources; or, the serving base station releases the coordinated radio resources at a preset time. In this way, the base station can continue to schedule other UEs using the released coordinated radio resources.
  • the method for reducing inter-cell signal interference provided by the embodiment of the present invention includes:
  • the second base station receives the user identifier of the user equipment that is served by the serving base station, and coordinates the radio resource with the serving base station, and obtains the coordinated radio resource of the user equipment corresponding to the user identifier.
  • the coordinated radio resource can only be used for scheduling of the user equipment corresponding to the user identifier;
  • the second base station circumvents the use of the coordinated radio resource.
  • the process of coordinating radio resources with the serving base station may include: the second base station receiving, by the serving base station, a coordinated radio resource or a radio resource identifier for scheduling the user equipment;
  • the method may include: the second base station receiving the service quality information of the bearer of the user equipment sent by the serving base station, and scheduling a coordinated radio resource or a radio resource identifier of the user equipment;
  • the method may include: the second base station receiving the quality of service information of the bearer of the user equipment that is sent by the serving base station; and sending, by the second base station, the determined information of the coordinated radio resource to the serving base station;
  • the method may include: the second base station receiving, by the serving base station, a coordinated radio resource or a radio resource identifier of the user equipment, where the second base station sends the determined information of the coordinated radio resource to the serving base station And one or a combination of the results of the coordination;
  • the second base station may receive the coordinated radio resource or the radio resource identifier of the user equipment sent by the serving base station, and the quality of service information of the bearer of the user equipment;
  • the base station transmits one or a combination of the determined information of the coordinated radio resources and the coordination result.
  • the process of coordinating the radio resource with the serving base station may further include: receiving, by the second base station, the duration of the radio resource scheduled by the serving base station to schedule the user equipment, and/or Or coordinate the effective time.
  • the process of coordinating the radio resource with the serving base station may further include: receiving, by the second base station, a duration and/or a coordination effective time of scheduling, by the serving base station, the radio resource of the user equipment;
  • the second base station returns a message to the serving base station, so that the serving base station acquires the schedulable duration and/or the coordination effective time of the coordinated radio resource according to the returned message.
  • the process of coordinating radio resources with the serving base station may further include: the second base station receiving a cause value sent by the serving base station to identify a cause of coordinating radio resources.
  • the method may further include: the second base station receiving, by the serving base station, information indicating that the coordinated radio resource is released; or The schedulable duration of the coordinated radio resource automatically releases the coordinated radio resource.
  • the information received by the second base station from the serving base station is carried by the handover request message, and the information sent by the second base station to the serving base station is carried by the handover request acknowledgement message.
  • the handover request message may further carry a pre-handover indication, where the pre-handover indication is used to indicate that the second base station waits for a subsequent handover message of the user equipment.
  • the method may further include: the second base station identifying that the user equipment corresponding to the user identifier accesses the second base station, and uses the coordinated radio resource scheduling After the user equipment corresponding to the user identifier, the user equipment may further include:
  • the second base station sends information indicating that the coordinated radio resource is released to the serving base station, so that the serving base station releases the coordinated radio resource.
  • FIG. 2 is a flow chart of another method for reducing inter-cell signal interference according to an embodiment of the present invention. As shown in Figure 2, the method includes:
  • Step 21 After configuring the radio resource, send, to the second base station, a configuration indicating that the configuration is started.
  • the resource usage indication of the radio resource so that the second base station avoids or reduces the radio resource of the power usage configuration.
  • the first base station is configured with the radio resource by the second base station, or is configured by the operation management and maintenance system to configure the radio resource for the first base station and the second base station.
  • the resource usage indication includes a time of using the configured radio resource, so that the second base station stops using the configured radio resource from the time.
  • Step 22 Schedule the user equipment by using the configured radio resources.
  • step 21 and step 22 may be performed by the first base station, and the first base station may be a macro base station or a small base station.
  • Step 22 may also include:
  • the serving base station is a first base station, which is a macro base station
  • the adjacent second base station is a small base station
  • the serving base station is a first base station, which is a macro base station
  • the adjacent second base station is a small base station
  • the serving base station is a first base station, which is a macro base station
  • the adjacent second base station is a small base station
  • this embodiment is directed to scenario 1, and includes the following steps:
  • Step 31 The first base station learns the moving speed of a certain UE that is moving in the cell to which it belongs. Specifically, the moving speed of the UE can be obtained by using the parameters of the prior art.
  • the prior art is switched, the historical information of the UE is transmitted between the base stations, including the identifier list of the cell that is connected when the previous connection state is continued, and the connection is performed.
  • the connection duration of the cell, the cell size information of the connected cell, etc. the first base station uses the history information of the UE to estimate the speed of the UE according to the cell size information and the connection duration.
  • Step 32 When the UE moves at a high speed, the first base station proceeds to step 33.
  • Step 33 The first base station sends a coordinated scheduling message to the second base station, where the base station coordinates the radio resources of the UE.
  • the first base station determines not to initiate the handover.
  • the initiating coordinated scheduling message may specifically include one or a combination of the following parameters:
  • Parameter 1 scheduling uplink or downlink radio resource information of the UE, that is, coordinating radio resources.
  • the radio resources may specifically be radio resources that are currently used (or scheduled) by the UE, or are expected to be used (or scheduled); and/or
  • Radio resources may be uplink or downlink; and/or
  • the radio resource may specifically be a time domain, a frequency domain, a code domain, a spatial domain, a power resource, or a combination thereof. and / or
  • the radio resource may specifically include: physical resource block (PR B) information and/or subframe information, power information, and approximate blank framing (ABS) mode (attern) information.
  • PR B physical resource block
  • ABS approximate blank framing
  • the PRB information may be an index (index), and the subframe information may be an index or a bitmap mode, indicating that the intra-frame scheduling subframe is a period of time; the power information may be a transmission power value.
  • Duration is the length of time that the coordinated radio resource is used, or how long it needs to be used (scheduled) Between.
  • the cause value may be specifically used to indicate that the coordinated radio resource is used for a high-speed UE, a short-term stay UE, coordinated scheduling, no handover condition, or no handover.
  • the effective time information is specifically used to indicate the coordination effective time, which can be effective immediately or at a specified time.
  • Coordinated scheduling time T5 represents the length of time that the first base station desires to be coordinated for the use of radio resources.
  • Step 34 After processing the coordinated scheduling message, the second base station returns a response coordination scheduling message to the first base station.
  • the response coordination scheduling message specifically includes one or a combination of the following parameters:
  • Parameter 1 Scheduling the uplink or downlink radio resources of the UE
  • the wireless resource may specifically be a wireless resource that is expected to be used (or scheduled); and/or
  • the radio resources may specifically be uplink or downlink; and/or
  • the radio resource may specifically be a time domain, a frequency domain, a code domain, an air domain, a power resource, or a combination thereof. and / or
  • the radio resources may specifically include: PRB information and/or subframe information, power information, and ABS pattern information.
  • the PRB information may be an index (index), and the subframe information may be an index or a bitmap mode, indicating that the intra-frame scheduling subframe is a period of time; the power information may be a transmission power value.
  • the response coordination scheduling message when the response coordination scheduling message includes the foregoing parameter, it indicates that the second base station modifies the radio resource that is transmitted by the first base station by using the coordinated scheduling message, and is used to determine the radio resource that the first base station should use.
  • Duration refers to the length of time that the UE expects to be coordinated with radio resources, or how long it is used (scheduled).
  • Parameter three Coordination results
  • the result of the coordination includes accepting or rejecting or accepting the modified radio resource.
  • the result of the coordination is acceptance or rejection, the above parameters may be saved.
  • the reason value is used to indicate the reason why the result of the coordination is to reject or accept the modified radio resource, but there is no available resource.
  • the cause value may be saved.
  • Coordinated scheduling time T6 represents the length of time that the second base station desires to be coordinated for the use of radio resources. If the second base station accepts coordination, the second base station circumvents the coordinated radio resources using the coordinated radio resources. The second base station may specifically circumvent the coordinated radio resource from the coordinated effective time.
  • step 35 if the first base station and the second base station coordinate the agreed radio resources, that is, the coordinated radio resources, proceed to step 35.
  • Step 35 After receiving the response coordination scheduling message returned by the second base station, the first base station schedules the UE by using the coordinated radio resource.
  • Step 36 The first base station sends a radio resource release message to the second base station, so that the second base station releases the coordinated radio resource.
  • the radio resource release message may specifically include: an effective time information and a cause value.
  • the effective time information may be effective immediately, or a specified time is effective.
  • the cause value indicates the reason for releasing the coordinated scheduling resource.
  • the first base station learns that the UE is in a high-speed state by using the moving speed of the UE, and coordinates the radio resources used by the UE with the second base station, so that the UE passes the coverage of the second base station.
  • the UE does not drop calls due to strong interference from the second base station.
  • the macro base station learns the UE speed, even if the UE approaches the small base station, the UE does not switch to the small base station, but continues to let the UE be served by the macro base station, thereby avoiding unnecessary handover. , improve switching efficiency, and avoid the increase of switching failure rate.
  • the radio resources are coordinated by the macro base station and the small base station, and the UE is avoided.
  • the first base station is a macro base station
  • the second base station is a small base station
  • the first base station is a macro base station
  • the second base station is a small base station
  • the small base station is requested to handover the UE to the small base station, but the small base station is overloaded (such as the backhaul link transmission resource overload or the processing resource overload), rejecting
  • the handover of the UE that is, the macro base station cannot switch the UE that needs to be handed over to the small base station.
  • the difference between this embodiment and the first embodiment is as follows:
  • the information about the UE's rights to the target cell and the target cell being unswitchable it is determined that the handover to the target cell cannot be initiated, or the target cell The handover (or access) of the UE cannot be supported, and then a scheduling coordination request is initiated to the second base station. details as follows:
  • the first base station learns that the target cell cannot support the handover (or access) of the UE. Specifically, it may be determined according to the following information that the handover to the target cell cannot be initiated, or the target cell cannot support the handover (or access) of the UE:
  • the user who does not belong to the target cell, or the user whose UE is not the target closed user group, or the closed user group list of the UE does not match the target closed user group;
  • the target cell is overloaded, such as overloaded transmission resources of the target cell, overload of processing capacity, and the like.
  • the first base station determines that the UE cannot be switched, and then compares the U with the second base station.
  • the radio resources used by E are coordinated so that when the UE traverses the coverage of the second base station, although no handover occurs, the call is not dropped due to strong interference of the second base station.
  • the serving base station is the first base station, which is a macro base station
  • the second base station is a small base station, and those skilled in the art should understand that it can be extended to the opposite direction or between the macro base stations.
  • scenario 4 that is substantially the same as the scene one. After a high-speed mobile UE moves into the target cell coverage, it stays in the target cell. If the scheduling is always coordinated, it is not conducive to resource utilization. Assuming that there is a scenario 5 in which a certain UE may move between two cells, it is possible to switch back and forth between two cells, that is, a scene in which the UE pings between two cells.
  • the present embodiment provides a corresponding method for reducing interference of small-area signals to avoid frequent handover.
  • Step 41 The first base station learns the moving speed of the UE. For details, refer to the description in the first embodiment. Optionally, for scenario five, this step can be saved.
  • Step 42 For the UE moving at high speed, continue the following process. Optionally, for scenario five, this step can be saved.
  • Step 43 The first base station sends a handover preparation request message to the second base station, where the second base station prepares for handover.
  • the handover preparation request message may specifically include not only the parameters carried in the coordination scheduling message in the step 33 in the first embodiment, but also the parameters: the target cell identifier, the RRC Context, the history information of the UE, and the service quality information of the bearer (or service) of the UE.
  • the hysteresis switching time T1 (or the delay switching time, the switching waiting time) may be further included.
  • a pre-handover indication may be further included.
  • the pre-handover indication is used to indicate the second base station: the handover of the user equipment by the serving base station is to be completed by a subsequent handover message, or is used to indicate that the second base station waits for a subsequent handover message of the user equipment, Or for indicating that the handover request message of the second base station is for coordinated scheduling.
  • the service quality information of the bearer (or service) of the UE may specifically include: an identifier of each bearer of the UE and a quality of service (Qos) parameter of each bearer of the UE, such as a Qo s classification identifier (QoS Class Identifier, QCI) ), Allocation and Retention Priority (ARP), maximum bit rate, and guaranteed bit rate.
  • Qos quality of service
  • the hysteresis switching time T1 (or delay switching time, handover waiting time) indicates the time when the second base station waits for the UE to switch access.
  • the timeout is that the UE does not handover or the first base station does not initiate a handover request during the T1 time period, and the second base station releases the coordinated wireless resources reserved for the UE.
  • Step 44 After processing the handover request message, the second base station returns a response handover request message, that is, a handover request acknowledgement message, to the first base station.
  • the handover request acknowledgement message may include not only the parameters in the step 34 of the embodiment, but also the quality of service information of the bearer (or service) of the UE and the handover command message sent to the UE.
  • the QoS information of the bearer (or the service) of the UE may include at least one of the bearer identifier that can be accepted and one of the QoS parameters of each bearer, where the Qos parameter of each bearer may be Q CI, ARP, maximum bit rate, Guarantee bit rate and so on.
  • the second base station If the second base station accepts the handover preparation, the second base station needs to circumvent the use of the coordinated radio resources.
  • the second base station sets the timer according to the hysteresis switching time T1 received in step 43, and the timer expires, the handover preparation process is automatically cancelled. Or the second base station does not set a timer, but waits for the serving base station to initiate a handover execution or handover cancel message according to the foregoing pre-handover indication, and cancels the handover preparation process when the second base station receives the handover fetch message sent by the serving base station.
  • Step 45 After receiving the handover request acknowledgement message returned by the second base station, the first base station schedules the UE by using the coordinated radio resource.
  • Step 46 Perform a switching operation or cancel the switching preparation.
  • performing the handover includes the following steps:
  • the first base station sends a handover execution message (or pre-change) to the second base station. Preparing to complete the message), informing the second base station that the UE is to be handed over to the second base station.
  • the first base station sends a handover command message to the UE, and sends the handover command message carried in the handover request confirmation message in step 44 to the UE.
  • the first base station initiates the above handover operation, and may be based on the time when the UE is coordinated and the measurement report of the UE. After a preset time threshold T2, the UE's measurement report shows that the signal of the second base station is still strong and meets the handover threshold. In particular, the preset time threshold T 2 is less than T1 , that is, the handover is completed before the second base station cancels the handover preparation process.
  • Undoing the switch accurately includes at least one of the following operations:
  • the first base station sends a handover cancel message to the second base station, and cancels the previous handover preparation process.
  • the canceling operation may be specifically based on the measurement report of the UE. After a preset time threshold T3, the measurement report of the UE indicates that the signal of the second base station is already weak, and the downlink interference to the UE is small, and the canceling handover is initiated. Accurate operation.
  • the first base station determines not to switch by determining the UE speed, and then coordinates with the second base station to use the radio resource used by the UE, so that when the UE passes the coverage of the second base station, or the UE continuously
  • the first base station completes the handover preparation process during the coordination process.
  • the first base station only needs to send another handover execution message to the second base station, and enters the handover execution phase, that is, initiates the handover, and the UE is started. Cut into small base stations to provide services.
  • the second base station sends a message to release the coordinated radio resources to improve resource utilization.
  • the handover execution may include:
  • Step 1 The first base station sends a handover command message to the UE, and uses the negotiated radio resource to schedule the UE (including the handover command). After the first base station sends the handover command to the UE, the coordinated radio resource is released. Source.
  • Step 2 The UE accesses the second base station.
  • Step 3 The second base station discovers that the UE is scheduled to use the coordinated radio resource after the UE accesses.
  • switching execution is a traditional process, including:
  • Step 1 The first base station sends a handover command message to the UE.
  • Step 2 The UE accesses the second base station.
  • the interference of U E in the handover process is avoided by coordinating interference during the handover process.
  • the target cell starts to use the coordinated radio resource that is not used before to schedule the UE, and the previous source cell sends the used coordinated radio resource to the UE after the handover command is sent to the UE.
  • interference is also avoided.
  • the third embodiment described above can also be applied to another scenario 6. 4
  • scenario 6 in a scenario where a certain UE may move between two cells, it is possible to switch between two cells. Since the signal of the source cell or the target cell has changed during the handover process, the interference increases.
  • the handover fails, for example, before the UE disconnects from the source cell, the radio link fails due to the drop of the source cell signal, or the handover command cannot be received, and the handover fails, or after the UE disconnects from the source cell, for example,
  • the cell signal is stronger than the target cell signal, so that the introduction of interference cannot access the target cell and cause the handover to fail.
  • the above-mentioned coordinated scheduling mode can reduce interference and ensure the success of the handover.
  • the second base station continues to use the coordinated radio resource.
  • the coordinated radio resource There are several ways to do this:
  • Manner 1 The second base station sends a coordination indication to the first base station to inform the first base station that the second base station will continue to use the coordinated radio resources, and the first base station evades the use.
  • Manner 2 After the UE accesses, the second base station continues to use the coordinated radio resources by default. The first base station evades.
  • the first base station performs the coordinated radio resource.
  • the release method can be specifically as follows:
  • Manner 1 After the UE accesses, the second base station sends a release indication to the first base station, indicating that the first base station releases the coordinated radio resource, and the first base station releases the coordinated radio resource after receiving the indication.
  • Manner 2 After the first base station sends a handover command to the UE, the first radio station automatically releases the coordinated radio resource at a preset time.
  • Manner 3 After the first base station sends a handover command to the UE, the coordinated radio resource is released immediately.
  • the first base station coordinates the radio resources used by the UE with the second base station, so that when the UE switches between the first base station and the second base station, the UE is reduced in the source cell by means of coordinated scheduling.
  • the interference when receiving the downlink information/transmitting the uplink information, and reducing the interference of the UE when the target cell is accessed, so that the UE does not drop the call due to interference.
  • the first base station and the second base station perform the coordination process only once, with the UE switching point as the boundary, and automatically switch between the use and the circumvention of the coordinated radio resources, thereby realizing the UE switching process between the source cell and the target cell.
  • the resulting interference control improves the efficiency of resource coordination.
  • This embodiment is directed to the foregoing scenario 6, and provides a method for reducing signal interference between cells to avoid handover failure. Specifically include:
  • the first base station and the second base station perform radio resource coordination on a certain UE, which is the same as step 33 and step 34 in the first embodiment.
  • the first base station After the second base station and the second base station coordinate the radio resources, the first base station starts to use the coordinated radio resources to schedule the UE, and the second base station circumvents the coordinated radio resources.
  • the first base station decides to switch the UE to the second base station, it initiates a handover request to the second base station.
  • Step 4 After receiving the handover request acknowledgement message returned by the second base station, the first base station performs the switching operation or cancels the handover accurately, and the subsequent steps are the same as in the third embodiment.
  • the first base station uses the UE before using the second base station before the UE switches.
  • the radio resource coordinates or coordinates some radio resources for subsequent handover of the UE, so that the UE is reduced in the source cell by coordinated scheduling before the UE handover and when the UE switches between the first base station and the second base station.
  • Downlink information/interference when transmitting uplink information while reducing interference of the UE when the target cell is accessed, so that the UE does not drop calls due to interference.
  • the first base station and the second base station only perform coordination once, and the UE switching time point is used as a limit, and the automatic use of the coordinated use and resource avoidance is performed, so that the UE is switched between the source cell and the target cell.
  • the resulting interference control improves the efficiency of resource coordination.
  • this embodiment is also applicable to scene four and scene five.
  • This embodiment is different from the foregoing embodiment, and avoids interference by means of radio resource configuration, and is applicable to the foregoing scenario 1 to scenario 5.
  • Step 51 Configure a radio resource for the first base station.
  • the radio resource can continue to be used until the second base station receives the use request from the first base station.
  • the configuration process can be configured by the second base station to the first base station by means of signaling.
  • the configuration process may be configured by the Operation, Adminis tration and Management (OMM) system for the first base station and the second base station, respectively.
  • OMM Operation, Adminis tration and Management
  • an indication in the allocation message activation when needed, that is, the receiver needs to send an indication when the allocated radio resource needs to be used, and then activate the use of the allocated radio resource.
  • the radio resource is defined as a radio resource configured by the second base station to the first base station, That is, for the part where the coincidence is configured, the subsequent radio resource configuration cancels the previous radio resource configuration and performs subsequent radio resource configuration.
  • the wireless resources can be ABS configuration information.
  • Step 52 The first base station sends a resource usage indication to the second base station, and informs the second base station that the first base station starts to use the radio resource configured in step 51.
  • the resource usage indication sent by the first base station may include a time T6 of using the configured radio resource.
  • the first base station no longer uses the configured radio resources after ⁇ 6 time.
  • Step 53 After receiving the resource usage indication, the second base station stops using (or reduces power usage) the radio resources configured in step 51.
  • the second base station can use the wireless resource.
  • the second base station after receiving the resource usage indication, notifies the first base station that the radio resource configured in step 51 can be used.
  • Step 54 The first base station schedules the UE by using the radio resource configured in step 51, thereby reducing interference of the second base station to the UE.
  • the first base station sends a resource stop indication to the second base station, and informs the second base station that the first base station can no longer use the radio resource configured in step 51.
  • the second base station reserves radio resources for the first base station, but the reserved resources can still be used by the second base station.
  • the first base station detects that the UE traverses the coverage of the second base station, it sends a message to notify the second base station to activate the reserved radio resources (ie, the second base station can no longer use), and then the first base station uses the radio resources to schedule the traversal.
  • the second base station covers the serving UE of the first base station.
  • the reserved radio resources are activated only when needed, which improves the utilization of radio resources.
  • the foregoing embodiment relates to that the signaling exchange between the first base station and the second base station is a direct signaling interaction or an indirect signaling exchange, and the indirect signaling exchange, for example, is performed by the core network node.
  • the message of step 43, step 44 in the above third embodiment may be Direct signaling interaction or indirect signaling exchange between the first base station and the second base station, and indirect signaling exchange, for example, forwarding information through the core network node.
  • the UE scheduling the UE by using the negotiated radio resource, specifically, scheduling the downlink signaling of the UE (such as a handover command, a random access response;), and/or uplink signaling (such as uplink feedback of a handover command, a radio resource connection establishment request) , and / or uplink and downlink data.
  • the handover request message is used to notify the other party to perform handover preparation
  • the handover request acknowledgement message is used to notify the other party that the handover preparation is completed.
  • the purpose of the user identifier carried in the process of coordinating the radio resources in the foregoing embodiment is to reduce the interference between the two base stations for which coordinated radio resources are used by the user.
  • the radio resource identifier may be further carried in the process of coordinating radio resources to identify a coordinated radio resource.
  • the source base station uses the coordinated radio resource identifier to make the second base station know which radio resource needs to be circumvented as the coordinated radio resource.
  • the real user identifier and the coordinated radio resource identifier may be carried in the subsequent handover message to indicate the association relationship between the user and the coordinated radio resource, so that the second base station can obtain the coordinated radio resource according to the user identifier, and further circumvent the use. Or start using.
  • FIG. 6 is a schematic structural diagram of a first base station for reducing inter-cell signal interference according to an embodiment of the present invention.
  • the first base station includes: a coordination unit 61 and a scheduling unit 62.
  • the coordinating unit 61 is configured to send the user identifier of the served user equipment to the neighboring second base station, coordinate the radio resource with the second base station, and obtain the coordinated radio resource of the user equipment corresponding to the user identifier. And causing, by the base station adjacent to the base station of the user equipment that uses the coordinated resource to schedule the user identifier, to avoid using the coordinated radio resource; Household equipment.
  • the coordinating unit 61 may be specifically configured to send, to the second base station, a coordinated radio resource or a radio resource identifier for scheduling the user equipment;
  • the service base station may be configured to: send the QoS information of the bearer of the user equipment to the second base station, and schedule a coordinated radio resource or a radio resource identifier of the user equipment; or the coordination unit 61 may include:
  • a first sending subunit configured to send the service quality information of the bearer of the user equipment to the second base station by the serving base station;
  • a first receiving subunit configured to receive information about the coordinated radio resource determined by the second base station
  • the coordination unit 61 may include:
  • a second sending subunit configured to send, to the second base station, a coordinated radio resource or a radio resource identifier of the user equipment
  • a second receiving subunit configured to receive one or a combination of the information of the coordinated radio resource determined by the second base station and a coordination result
  • the coordination unit 61 may include:
  • a third sending subunit configured to send, to the second base station, a coordinated radio resource or a radio resource identifier of the user equipment, and service quality information of the bearer of the user equipment;
  • a third receiving subunit configured to receive one or a combination of the information of the coordinated radio resource determined by the second base station and a coordination result.
  • the coordinating unit 61 may be further configured to indicate to the second base station, a duration and/or a coordination effective time of scheduling radio resources of the user equipment;
  • the coordination unit 61 may further include:
  • an indication subunit configured to indicate to the second base station, a duration and/or a coordination effective time of occupying the radio resource of the user equipment;
  • a time acquisition subunit configured to acquire the association according to the message returned by the second base station Adjust the schedulable duration and/or the coordination effective time of the radio resource.
  • the coordinating unit 61 is further configured to send, to the second base station, a cause value for identifying a cause of coordinating radio resources.
  • the first base station may further include: a handover determining unit, configured to: before the coordinating unit and the second base station coordinate radio resources, determine that the user equipment corresponding to the user identifier is not switched to the Second base station.
  • a handover determining unit configured to: before the coordinating unit and the second base station coordinate radio resources, determine that the user equipment corresponding to the user identifier is not switched to the Second base station.
  • the handover determining unit may be specifically configured to: according to the moving speed of the user equipment corresponding to the user identifier, or according to the user equipment corresponding to the user identifier, the right information of the cell of the second base station or the second base station is unavailable. And switching information, determining that the user equipment corresponding to the user identifier is not switched to the second base station.
  • the handover determining unit is specifically configured to obtain, according to historical information of the user equipment corresponding to the user identifier, a moving speed of the user equipment corresponding to the user identifier;
  • the first base station may further include: a resource release indication unit, configured to send, after the scheduling unit uses the coordinated radio resource to schedule the user equipment corresponding to the user identifier, to send to the second base station Instructing to release the information of the coordinated wireless resource.
  • a resource release indication unit configured to send, after the scheduling unit uses the coordinated radio resource to schedule the user equipment corresponding to the user identifier, to send to the second base station Instructing to release the information of the coordinated wireless resource.
  • the first base station provided by the embodiment of the present invention may further include: a handover request unit and a handover confirmation receiving unit.
  • the handover requesting unit is configured to: after the coordinating unit coordinates the radio resource with the second base station, the scheduling unit sends, to the second base station, the user equipment corresponding to the user identifier by using the coordinated radio resource Switching request message;
  • a handover confirmation receiving unit is configured to receive a handover request acknowledgement message of the handover request message returned by the second base station;
  • the scheduling unit is configured to send, by the coordinated radio resource, a handover command message to a user equipment corresponding to the user identifier.
  • the coordinating unit 61 may be specifically configured to coordinate radio resources with the second base station by using a handover request message.
  • the handover request message further carries a pre-handover indication, where the pre-handover indication is used to indicate a subsequent handover message of the second base station to the user equipment.
  • the corresponding user equipment sends the handover command message, or is specifically configured to send a handover cancellation message to the second base station, and instruct the second base station to release the information of the coordinated radio resource.
  • a handover execution unit configured to send the handover command message to the user equipment after the coordination unit and the second base station coordinate radio resources
  • the resource evasion unit is further configured to circumvent the use of the coordinated radio resource.
  • a release indication receiving unit configured to receive, after the resource circumvention unit circumvents the use of the coordinated wireless resource, information that is sent by the second base station to the serving base station to release the coordinated radio resource;
  • a releasing unit configured to release the coordinated wireless resource after the release indication receiving unit receives the information that the second base station sends to the serving base station to release the coordinated radio resource.
  • the first base station provided by the embodiment of the present invention may further include:
  • a releasing unit configured to release the coordinated wireless resource for a preset time.
  • the first base station serving as the serving base station sends the user identifier to the adjacent second base station through the coordinating unit, and performs radio resource coordination with the second base station, so as to correspond to the use of the coordinated resource to schedule the user identifier.
  • the neighboring base stations of the user equipment of the user equipment circumvent the use of the coordinated radio resources, so that the coordinated radio resources are not used by neighboring base stations simultaneously or at the same time, and the signal interference between the cells is effectively reduced.
  • FIG. 7 is a schematic structural diagram of a second base station for reducing inter-cell signal interference according to an embodiment of the present invention.
  • the second base station includes: a coordinating unit 71 and a resource disabling unit 72.
  • the coordinating unit 71 is configured to receive a user of the serving base station service sent by a neighboring serving base station a user identifier of the device, the radio resource is coordinated with the serving base station, and the coordinated radio resource of the user equipment corresponding to the user identifier is obtained, so that the coordinated radio resource can be used only for the user equipment corresponding to the user identifier.
  • the resource disabling unit 72 is configured to circumvent the use of the coordinated radio resource when the serving base station uses the coordinated radio resource to schedule the user equipment corresponding to the user identifier.
  • the coordinating unit 71 may be specifically configured to receive a coordinated radio resource or a radio resource identifier that is sent by the serving base station and that schedules the user equipment;
  • the coordination unit 71 may include:
  • a first receiving subunit configured to receive service quality information of the bearer of the user equipment sent by the serving base station
  • a first sending subunit configured to send the determined information of the coordinated wireless resource to the serving base station
  • the coordination unit 71 may include:
  • a second receiving subunit configured to receive a coordinated radio resource or a radio resource identifier of the user equipment sent by the serving base station
  • a second sending subunit configured to send, to the serving base station, one or a combination of the determined information of the coordinated wireless resource and a coordination result
  • the coordination unit 71 may include:
  • a third receiving subunit configured to receive a coordinated radio resource or a radio resource identifier of the user equipment sent by the serving base station, and a service quality information of the bearer of the user equipment;
  • a third sending subunit configured to The serving base station transmits one or a combination of the determined information of the coordinated radio resources and the coordination result.
  • the coordinating unit 71 is further configured to receive, by the serving base station, a duration and/or a coordination effective time of scheduling the radio resource of the user equipment; Or the coordination unit 71 may further include:
  • a time indication receiving subunit configured to receive a duration and/or a coordination effective time of the radio resource that is scheduled to be used by the serving base station to schedule the user equipment
  • a response subunit configured to return a message to the serving base station, to enable the serving base station to obtain a schedulable duration and/or a coordination effective time of the coordinated radio resource according to the returned message.
  • the coordinating unit 71 is further configured to receive a cause value sent by the serving base station to identify a cause of the coordinated radio resource.
  • a release receiving unit configured to receive, after the resource disabling unit circumvents the use of the coordinated radio resource, information that is sent by the serving base station to release the coordinated radio resource, and a release unit, configured to release according to the indication The information of the coordinated radio resources is released by the coordinated resources.
  • the second base station provided by the embodiment of the present invention may further include: a releasing unit, configured to automatically release the coordinated radio resource according to the schedulable duration of the coordinated radio resource.
  • the coordinating unit 71 may coordinate radio resources with the serving base station through a handover request message and a handover request acknowledgement message.
  • the handover request message may also carry a pre-handover indication, where the pre-switching indication is used to indicate that the second base station waits for a subsequent handover message of the user equipment.
  • the second base station may further include: an access identifying unit, configured to: after the resource disabling unit circumvents the use of the coordinated radio resource, the second base station identifies the user corresponding to the user identifier The device accesses the second base station;
  • a scheduling unit configured to schedule, by using the coordinated radio resource, a user equipment corresponding to the user identifier.
  • a release indication unit after using the coordinated radio resource to schedule the user equipment corresponding to the user identifier, sending, to the serving base station, information indicating that the coordinated radio resource is released, so that the serving base station releases the coordinated Wireless resources.
  • the second base station receives, by the coordinating unit, the user identifier sent by the first base station that is the serving base station, and performs radio resource coordination with the first base station, so that the user identifier is scheduled to be used with the coordinated resource.
  • the base station adjacent to the base station of the corresponding user equipment avoids using the coordinated radio resource, so that the coordinated radio resource is not used by the adjacent base station at the same time or at the same time, and the signal interference between the cells is effectively reduced. .
  • FIG. 8 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention.
  • the wireless communication system includes a first base station 81 and a second base station 82.
  • the first base station 81 and the second base station 82 When a certain user equipment is located in an overlapping area of the first base station 81 and the second base station 82, the first base station 81 and the second base station 82.
  • the coordination of the radio resources may be performed to ensure that the coordinated radio resources are used only for the scheduling of the user equipment.
  • the first base station 81 may be any one of the foregoing base station embodiments for reducing inter-cell signal interference
  • the second base station 82 may be any one of the foregoing base station embodiments for reducing inter-cell signals.
  • the second base station that interferes, the first base station 81 is adjacent to the second base station 82.
  • the first base station serving as the serving base station performs radio resource coordination with the second base station by transmitting the user identifier to the adjacent second base station, so that the user corresponding to the user identifier is scheduled to be used by using the coordinated resource.
  • the base station adjacent to the base station of the device avoids using the coordinated radio resource, so that the coordinated radio resource is not used by the adjacent base station at the same time or at the same time, and the signal interference between the cells is effectively reduced.

Abstract

本发明涉及一种用于降低小区间信号干扰的方法、基站及无线通信系统,用于降低小区间信号干扰的方法包括:服务基站将所服务的用户设备的用户标识发送给相邻的第二基站,与所述第二基站协调无线资源,得到调度所述用户标识对应的用户设备的被协调无线资源,以使与使用所述被协调资源调度所述用户标识对应的用户设备的基站相邻的基站,规避使用所述被协调无线资源;所述服务基站使用所述被协调无线资源调度所述用户标识对应的用户设备。

Description

用于降低小区间信号干扰的方法、 基站及无线通信系统 本申请要求于 2011 年 9 月 14 日提交中国专利局、 申请号为 201110271809.4、 发明名称为 "用于降低小区间信号干扰的方法、 基站及无 线通信系统" 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
本发明涉及通信技术, 尤其涉及一种用于降低小区间信号干扰的方法、 基站及无线通信系统。 发明背景
随着移动宽带的发展, 终端用户的带宽需求也越来越多, 而现有的以 宏基站为主的组网方式, 将无法满足移动宽带业务所需要的比特速率。
为了进一步提升系统容量, 可以在宏基站范围内引入更多低功率接入 点或者小基站 (下面统一称为小基站)。如长期演进 ( Long Term Evolution, LTE )技术中的家庭基站( Home eNodeB )、 微基站( micro eNodeB )、 微微 基站 (pico eNodeB )、 中继基站 (Relay eNodeB )、 超微微基站 ( femto eNodeB )、 远端射频头 (RRH, Remote Radio Head)等接入点 ( access point )。
小基站的发射功率小于宏基站的发射功率, 下行覆盖范围远小于宏基 站的下行覆盖范围, 宏基站与小基站的混合组网方式可以增强热点区域覆 盖、 室内盲点 (或弱点)覆盖、 宏基站的小区边缘覆盖, 提升小区平均吞 吐量、 小区边缘吞吐量、 小区的上行 /下行频谱利用率、 降低网络成本及运 营商的 CAPEX(capital expenditure)等, 我们称之为异构网络。
当用户设备 ( UE )在小基站和宏基站釆用同频组网方式的异构网络中 移动时, 可能会经过小基站。 当经过小基站和宏基站的边界时, UE需要发 生切换。研究发现, 在异构网络切换的时候,由于干扰原因导致 UE的切换失 败率较高。 比如由于宏小区对小小区的下行干扰,导致小小区的 UE接收下 行信息困难而失败;或者比如被宏小区服务的 UE移动到小小区中心区位置 时, 因为小小区对宏小区的下行干扰, 导致宏小区的 UE接收下行信息困难 而失败; 再比如由于小小区的 UE对宏小区的 UE的上行干扰, 导致宏小区 无法接收 UE的上行信息而失败。
若异构网络中的小基站越多, 则 UE需要发生的切换将更加频繁, 频 繁的切换将给网络带来大量的信令和处理负荷, 如果为了减少切换次数而 不让 UE切换, 那么 UE将因为干扰问题而掉话, 比如被宏小区服务的 UE 穿过小小区时, 如果不切换, 当 UE进入到小小区中心时, 小小区的下行对 UE造成下行强干扰, 而导致 UE掉话。 发明内容
本发明实施例提出一种降低小区间信号干扰的方法、 基站及无线通信 系统, 以降低小区间的信号干扰。
本发明实施例提供了一种降低小区间信号干扰的方法, 包括: 服务基站将所服务的用户设备的用户标识发送给相邻的第二基站, 与 所述第二基站协调无线资源, 得到调度所述用户标识对应的用户设备的被 协调无线资源, 以使与使用所述被协调资源调度所述用户标识对应的用户 设备的基站相邻的基站, 规避使用所述被协调无线资源;
所述服务基站使用所述被协调无线资源调度所述用户标识对应的用户 设备。
本发明实施例还提供了一种降低小区间信号干扰的方法, 包括: 第二基站接收相邻的服务基站发送的所述服务基站服务的用户设备的 用户标识, 与所述服务基站协调无线资源, 得到调度所述用户标识对应的 用户设备的被协调无线资源, 以使所述被协调无线资源仅能用于所述用户 标识对应的用户设备的调度;
在所述服务基站使用所述被协调无线资源调度所述用户标识对应的用 户设备时, 所述第二基站规避使用所述被协调无线资源。
本发明实施例还提供了一种用于降低小区间信号干扰的第一基站, 包 括:
协调单元, 用于将所服务的用户设备的用户标识发送给相邻的第二基 站, 与所述第二基站协调无线资源, 得到调度所述用户标识对应的用户设 备的被协调无线资源, 以使与使用所述被协调资源调度所述用户标识对应 的用户设备的基站相邻的基站, 规避使用所述被协调无线资源;
调度单元, 用于使用所述被协调无线资源调度所述用户标识对应的用 户设备。
本发明实施例还提供了一种用于降低小区间信号干扰的第二基站, 包 括:
协调单元, 用于接收相邻的服务基站发送的所述服务基站服务的用户 设备的用户标识, 与所述服务基站协调无线资源, 得到调度所述用户标识 对应的用户设备的被协调无线资源, 以使所述被协调无线资源仅能用于所 述用户标识对应的用户设备的调度;
资源禁用单元, 用于在所述服务基站使用所述被协调无线资源调度所 述用户标识对应的用户设备时, 规避使用所述被协调无线资源。
本发明实施例还提供了一种无线通信系统, 包括上述用于降低小区间 信号干扰的第一基站及上述用于降低小区间信号干扰的第二基站, 所述第 一基站与所述第二基站相邻。
本发明实施例提供的用于降低小区间信号干扰的方法、 基站及无线通 信系统, 通过用户设备的服务基站向相邻的第二基站发送用户标识, 与第 二基站进行无线资源协调, 以使与使用所述被协调资源调度所述用户标识 对应的用户设备的基站相邻的基站, 规避使用所述被协调无线资源, 使得 被协调无线资源不会被相邻的基站同时使用或同时以较大功率使用, 有效 降低了小区间的信号干扰。 附图简要说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例中所 需要使用的附图作简单地介绍, 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, 对于本领域普通技术人员来讲, 在不付出创造性劳动 性的前提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的一种降低小区间信号干扰的方法的流程图; 图 2为本发明实施例提供的另一种降低小区间信号干扰的方法的流程 图;
图 3 为本发明实施例提供的再一种降低小区间信号干扰的方法的流程 图;
图 4为本发明实施例提供的又一种降低小区间信号干扰的方法的流程 图;
图 5本发明实施例四提供的降低小区间信号干扰的方法的流程图; 图 6为本发明实施例提供的用于降低小区间信号干扰的第一基站的结 构示意图;
图 7 为本发明实施例提供的用于降低小区间信号干扰的第二基站的结 构示意图;
图 8为本发明实施例提供的无线通信系统的结构示意图。 实施本发明的方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进 行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没 有作出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的 范围。
图 1为本发明实施例提供的一种降低小区间信号干扰的方法的流程图。 如图 1所示, 该方法包括:
步骤 11、 服务基站将所服务的用户设备的用户标识发送给相邻的第二 基站, 与所述第二基站协调无线资源, 得到调度所述用户标识对应的用户 设备的被协调无线资源, 以使与使用所述被协调资源调度所述用户标识对 应的用户设备的基站相邻的基站, 规避使用所述被协调无线资源。 规避使 相同的时间使用、 或者降低功率使用, 只要从时域、 频域、 码域或者空域 能正交就行。 或者对同一个用户设备( UE ), 两个基站同时使用被协调的无 线资源进行协调调度。
步骤 12、 所述服务基站使用所述被协调无线资源调度所述用户标识对 应的用户设备。
本实施例中, 用户设备的服务基站通过向相邻的第二基站发送用户标 识, 与第二基站进行无线资源协调, 以使与使用所述被协调资源调度所述 用户标识对应的用户设备的基站相邻的基站, 规避使用所述被协调无线资 源, 使得被协调无线资源不会被相邻的基站同时使用或同时以较大功率使 用, 有效降低了小区间的信号干扰。
其中, 基站可为 eNB、 RNC或 RRH (远端射频头), 在 RRH场景下, 基站之间的无线资源协调可以是 eNB与 RRH之间的无线资源协调,传统上 基站为 eNB。
使用所述被协调无线资源调度所述用户设备, 包括:用于调度给 UE下 发的控制信令或数据; 或者包括: 用于调度 UE发送上行信令或数据。
与所述第二基站协调无线资源可包括:
所述服务基站向所述第二基站发送调度所述用户设备的协调无线资源 或无线资源标识; 具体地, 服务基站可获取所述用户设备上报的对所述第 二基站小区的测量报告, 向所述第二基站发送调度所述用户设备计划使用 的无线资源的信息即协调无线资源。
或者, 与所述第二基站协调无线资源可包括:
所述服务基站向所述第二基站发送调度所述用户设备的承载的服务质 量信息及调度所述用户设备的协调无线资源或无线资源标识。
或者, 与所述第二基站协调无线资源可包括:
所述服务基站向所述第二基站发送所述用户设备的承载的服务质量信 息;
所述服务基站接收所述第二基站确定的所述被协调无线资源的信息。 或者, 与所述第二基站协调无线资源可包括:
所述服务基站向所述第二基站发送所述用户设备的协调无线资源或无 线资源标识;
所述服务基站接收所述第二基站确定的所述被协调无线资源的信息及 协调结果中的一种或组合。
或者, 与所述第二基站协调无线资源可包括:
所述服务基站向所述第二基站发送所述用户设备的协调无线资源或无 线资源标识, 以及所述用户设备的承载的服务质量信息;
所述服务基站接收所述第二基站确定的所述被协调无线资源的信息及 协调结果中的一种或组合。
其中, 无线资源标识可为无线资源编号, 即每个无线资源编号与相应 信息的对应关系, 协调时, 仅通过发送无线资源编号来进行协商。 当协调 双方就某一无线资源编号达成一致, 则协调双方也就确定了被协调无线资 源。
进一步地, 与所述第二基站协调无线资源还可包括: 所述服务基站向所述第二基站指示占用调度所述用户设备的无线资源 的时长和 /或协调生效时间。
或者进一步地, 与所述第二基站协调无线资源还可包括:
所述服务基站向所述第二基站指示占用调度所述用户设备的无线资源 的时长和 /或协调生效时间;
所述服务基站根据所述第二基站返回的消息, 获取所述被协调无线资 源的可调度时长和 /或协调生效时间。 其中, 所述被协调无线资源的可调度 时长可以是隐式或者显式的, 隐式即被协调无线资源的使用在规避使用的 基站收到释放消息后释放被协调无线资源; 显式即所述被协调无线资源的 可调度时长由基站通过信令方式告知。 被协调无线资源的协调生效时间也 可以是隐式或者显式的, 隐式即, 服务基站收到第二基站反馈的消息后即 可生效, 显式即由第二基站通过信令方式告知。
其中, 释放被协调无线资源即不再停止使用被协调无线资源调度其他
UE, 或者不再降低功率使用被协调无线资源调度其他 UE, 即正常使用被 协调无线资源调度 UE。
或者, 还可以是第二基站发出或者收到协调无线资源的请求后, 服务 基站或第二基站启动预设的定时器, 也就是说协调消息里可以不包含时间 信息, 但是协调双方有约定。
生效时间类似, 也可以是不在消息里包含生效时间, 但是双方有约定 的规则, 比如第二基站收到消息后立即生效, 或者第二基站发出反馈消息 后立即生效, 或者第一基站收到返回的消息后立即生效。
进一步地, 与所述第二基站协调无线资源的过程, 还包括: 所述服务 基站向所述第二基站发送用于标识协调无线资源的原因的原因值。
可选地, 与所述第二基站协调无线资源之前, 还包括: 服务基站确定 不将所述用户标识对应的用户设备切换到所述第二基站。
具体地, 确定不将所述用户标识对应的用户设备切换到第二基站的过 程可包括: 根据所述用户标识对应的用户设备的移动速度, 或者根据所述 用户标识对应的用户设备对所述第二基站的小区的权限信息或所述第二基 站不可切换信息, 所述服务基站确定不将所述用户标识对应的用户设备切 换到所述第二基站。
其中, 所述用户标识对应的用户设备的移动速度根据所述用户标识对 应的用户设备的历史信息得到。
第二基站的小区的权限信息是由用户标识对应的用户设备读取所述第 二基站的广播消息后, 上报给所述服务基站的。
第二基站不可切换信息具体可以是直接的不可切换指示、 或者负载过 载、 负载高等隐式指示。
本发明实施例提供的降低小区间信号干扰的方法还可包括: 将所述用 户设备上报的空闲态的速度评估、 小区重选次数及重选时间、 或小区类型 信息或小区标识及在每个小区的停留时间添加到所述用户设备的历史信息 中。
所述服务基站与所述第二基站协调无线资源之后, 还包括:
所述服务基站向所述第二基站发送切换请求消息, 接收所述第二基站 返回的所述切换请求消息的切换请求确认消息;
所述服务基站使用所述被协调无线资源调度所述用户标识对应的用户 设备的过程, 包括: 所述服务基站使用所述被协调无线资源向所述用户标 识对应的用户设备发送切换命令消息。
与所述第二基站协调无线资源时还包括: 与所述第二基站进行切换准 备操作, 即所述服务基站向所述第二基站发送的信息通过切换请求消息携 带, 所述服务基站接收的所述第二基站发送的信息通过切换请求确认消息 携带。
如服务基站通过切换请求消息向所述第二基站发送目标小区标识、 无 线资源控制 (Radio Resource Control, RRC )上下文(context ), 所述用户 设备的历史信息、 所述用户设备的承载的服务质量信息。
服务基站接收所述第二基站返回的切换请求确认消息, 该切换请求确 认消息可携带有所述用户设备的业务质量信息及所述第二基站发送给所述 用户设备的切换命令消息中的至少一种。
上述切换请求消息还可携带有预切换指示, 所述预切换指示用于指示 所述第二基站, 所述服务基站对所述用户设备的切换将通过后续切换消息 完成, 或者用于指示所述第二基站, 等待所述用户设备的后续切换消息, 或者用于指示所述第二基站, 所述切换请求消息目的是协调调度。 这样, 第二基站不需要通过设定定时器来决定是否取消切换准备。 当切换请求消 息中没有上述预切换指示时, 第二基站需要设定定时器, 在规定的时间内 若没有切换发送, 则取消之前的切换准备工作。
所述服务基站使用所述被协调无线资源调度所述用户标识对应的用户 设备的过程, 包括: 所述服务基站使用所述被协调无线资源向所述用户标 识对应的用户设备发送所述切换命令消息;
或者包括: 所述服务基站向所述第二基站发送切换取消消息, 指示所 述第二基站释放所述被协调无线资源的信息。
与所述第二基站协调无线资源之后, 还可包括:
所述服务基站向所述用户设备发送所述切换命令消息;
所述服务基站规避使用所述被协调无线资源。
所述服务基站向所述用户设备发送所述切换命令消息之后, 还可启动 一个定时器。
所述服务基站规避使用所述被协调无线资源之后, 还可包括: 所述服务基站收到第二基站向所述服务基站发送的指示释放所述被协 调无线资源的信息后, 释放所述被协调无线资源; 或者, 所述服务基站在 预设的时间释放所述被协调无线资源。 这样, 基站可以继续使用释放的被 协调无线资源调度其他 UE。 相应地, 在第二基站侧, 本发明实施例提供的降低小区间信号干扰的 方法包括:
第二基站接收相邻的服务基站发送的所述服务基站服务的用户设备的 用户标识, 与所述服务基站协调无线资源, 得到调度所述用户标识对应的 用户设备的被协调无线资源, 以使所述被协调无线资源仅能用于所述用户 标识对应的用户设备的调度;
在所述服务基站使用所述被协调无线资源调度所述用户标识对应的用 户设备时, 所述第二基站规避使用所述被协调无线资源。
其中, 与所述服务基站协调无线资源的过程可包括: 所述第二基站接 收所述服务基站发送的调度所述用户设备的协调无线资源或无线资源标 识;
或者可包括: 所述第二基站接收所述服务基站发送的所述用户设备的 承载的服务质量信息及调度所述用户设备的协调无线资源或无线资源标 识;
或者可包括: 所述第二基站接收所述服务基站发送的所述用户设备的 承载的服务质量信息; 所述第二基站向所述服务基站发送确定的所述被协 调无线资源的信息;
或者可包括: 所述第二基站接收所述服务基站发送的所述用户设备的 协调无线资源或无线资源标识; 所述第二基站向所述服务基站发送确定的 所述被协调无线资源的信息及协调结果中的一种或组合;
或者可包括: 所述第二基站接收所述服务基站发送的所述用户设备的 协调无线资源或无线资源标识, 以及所述用户设备的承载的服务质量信息; 所述第二基站向所述服务基站发送确定的所述被协调无线资源的信息及协 调结果中的一种或组合。
进一步地, 与所述服务基站协调无线资源的过程还可包括: 所述第二 基站接收所述服务基站指示的占用调度所述用户设备的无线资源的时长和 / 或协调生效时间。
或者进一步地, 与所述服务基站协调无线资源的过程还可包括: 所述第二基站接收所述服务基站指示的占用调度所述用户设备的无线 资源的时长和 /或协调生效时间;
所述第二基站向所述服务基站返回消息, 以使所述服务基站根据返回 的消息, 获取所述被协调无线资源的可调度时长和 /或协调生效时间。
进一步地, 与所述服务基站协调无线资源的过程还可包括: 所述第二 基站接收所述服务基站发送的用于标识协调无线资源的原因的原因值。
所述第二基站规避使用所述被协调无线资源之后, 还可包括: 所述第二基站接收所述服务基站发送的指示释放所述被协调无线资源 的信息; 或者, 所述第二基站根据所述被协调无线资源的可调度时长, 自 动释放所述被协调无线资源。
所述第二基站从所述服务基站接收的信息通过切换请求消息携带, 所 述第二基站向所述服务基站发送的信息通过切换请求确认消息携带。
进一步地, 所述切换请求消息还可携带有预切换指示, 所述预切换指 示用于指示所述第二基站等待所述用户设备的后续切换消息。
所述第二基站规避使用所述被协调无线资源之后, 还可包括: 所述第二基站识别出所述用户标识对应的用户设备接入所述第二基站, 使用所述被协调无线资源调度所述用户标识对应的用户设备之后, 还 可包括:
所述第二基站向所述服务基站发送指示释放所述被协调无线资源的信 息, 以使所述服务基站释放所述被协调无线资源。
图 2为本发明实施例提供的另一种降低小区间信号干扰的方法的流程 图。 如图 2所示, 该方法包括:
步骤 21、 配置无线资源后, 向第二基站发送用于表示开始使用配置的 无线资源的资源使用指示, 以使所述第二基站避免或者降低功率使用配置 的无线资源。
如第一基站被所述第二基站配置无线资源, 或者被运营管理和维护系 统同时为第一基站与第二基站配置无线资源。
所述资源使用指示中包含使用所述配置的无线资源的时间, 以使得所 述第二基站从所述时间开始停止使用所述配置的无线资源。
步骤 22、 使用配置的无线资源调度用户设备。
上述步骤 21、 步骤 22可由第一基站执行, 第一基站可为宏基站, 也可 为小基站。
步骤 22之后还可包括:
向所述第二基站发送用于告知第一基站停止使用配置的无线资源的资 源停止使用指示, 以使所述第二基站释放所述配置的无线资源。
下面通过实施例一〜实施例四对上述的降低小区间信号干扰的方法进 行具体说明。
实施例一
本实施例中, 服务基站为第一基站, 是宏基站, 相邻的第二基站是小 基站, 本领域技术人员应理解为可扩展到相反方向或宏基站之间。 假设有 一场景一中, 某一 UE高速移动, 由于从 UE满足测量门限, 到发起测量报 告和执行切换, 整个过程需要一定的时间。 当该 UE移动速度较快时, 切换 完成之前,很可能 UE已经移动到了小基站的中心位置, 小基站信号强度会 陡峭的上升, 导致对这个被宏基站服务的 UE遇到强大的来自小基站的干 扰, 从而引发切换失败。 即使 UE切换成功, 由于移动速度较快, UE也会 快速切换出去, 带来不必要的切换。 因为每个切换过程需要大量的信令开 销, 同时给用户带来切换中断。
如图 3所示, 本实施例针对场景一, 包括如下步骤:
步骤 31、 第一基站获知所属小区内正在移动的某一 UE的移动速度。 具体地,可以利用现有技术的参数通过计算得到 UE的移动速度,现有 技术切换时,基站之间传递该 UE的历史信息, 包括先前持续处于连接状态 时所连接的小区的标识列表, 连接小区的连接持续时间, 连接小区的小区 尺寸信息等, 第一基站利用该 UE的历史信息,根据小区尺寸信息和连接持 续时间, 估计出 UE的速度。 具体可以使用小区尺寸信息估算出小区半径, 然后用小区直径除以连接持续时间,估计出 UE的速度。 比如一个大尺寸的 小区折算成 600米, 如果停留时间是 60秒, 那么 UE的速度是 600米 /60 秒 = 10米 /秒 =36公里 /小时。
步骤 32、 当 UE高速移动时, 第一基站继续执行步骤 33。
步骤 33、 第一基站向第二基站发起协调调度消息, 用于对调度该 UE 的无线资源进行基站之间的协调。 可选地, 第一基站发起协调调度消息之 前, 第一基站确定不发起切换。 在发起的协调调度消息中, 具体可包括如 下参数之一或组合:
参数一: 调度该 UE的上行或下行无线资源信息即协调无线资源 i. 无线资源具体可以是当前使用 (或调度) UE 的、 或期望使用(或调 度)的无线资源; 和 /或
ii.无线资源具体可以是上行或下行的; 和 /或
iii.无线资源具体可以是时域、 频域、 码域、 空域、 功率资源或其组合。 和 /或
iv.无线资源具体可以包括: 物理资源块(Physical Resource Block, PR B )信息和 /或子帧 (Subframe )信息、 功率信息及近似空白子帧 (almost b lank subframe, ABS )模式 ( attern )信息
PRB信息具体可以是索引 (index ), 子帧信息具体可以是 index、 位图 模式, 表示一段时间片内调度子帧; 功率信息可以是发射功率值。
参数二: 持续时间
持续时间即所协调无线资源的时间长度, 或者需要使用(调度)多长时 间。
参数三: 原因值
原因值具体可以用来表示协调无线资源用于高速 UE、 短期停留 UE、 协调调度、 不具备切换条件或不切换。
参数四: 生效时间信息
生效时间信息具体用于表示协调生效时间, 可以是立即生效、 或在一 个指定的时间生效。
参数五: 协调调度时间 T5
协调调度时间 T5表示第一基站期望被协调无线资源的使用时间长度。 步骤 34、 第二基站对协调调度消息处理后, 向第一基站返回响应协调 调度消息。 响应协调调度消息具体包括如下参数之一或组合:
参数一: 调度该 UE的上行或下行无线资源
无线资源具体可以是期望被使用(或调度)的无线资源; 和 /或
无线资源具体可以是上行或下行的; 和 /或
无线资源具体可以是时域、 频域、 码域、 空域、 功率资源或其组合。 和 /或
无线资源具体可以包括: PRB 信息和 /或子帧 (Subframe )信息、 功率 信息及 ABS模式( pattern )信息。
PRB信息具体可以是索引 (index ), 子帧信息具体可以是 index、 位图 模式, 表示一段时间片内调度子帧; 功率信息可以是发射功率值。
可选的, 当响应协调调度消息包含上述参数时, 表示第二基站对第一 基站通过协调调度消息传递过来的无线资源进行了修改, 用于确定第一基 站应该使用的无线资源。
参数二: 持续时间
持续时间是指 UE期望被协调无线资源的时间长度, 或者被使用 (调度) 多长时间。 参数三: 协调结果
协调结果包括接受或者拒绝或者接受修改的无线资源, 可选地, 当协 调结果为接受或拒绝时, 上述参数一可省。
参数四: 原因值
原因值用于表示协调结果为拒绝或接受修改的无线资源的原因, 可为 没有可用资源。 可选地, 当协调结果为接受时, 原因值可省。
参数五: 协调调度时间 T6
协调调度时间 T6表示第二基站期望被协调无线资源的使用时间长度。 如果第二基站接受协调, 那么第二基站规避使用协调好的无线资源即 被协调无线资源。 第二基站具体可以从协调好的生效时间开始, 规避使用 被协调无线资源。
经过上述步骤 33、 步骤 34, 如果第一基站与第二基站协调出达成一致 的无线资源即被协调无线资源, 则继续执行步骤 35。
步骤 35、 第一基站收到第二基站返回的响应协调调度消息后, 使用被 协调无线资源调度该 UE。
步骤 36、 第一基站向第二基站发送无线资源释放消息, 以便第二基站 释放上述被协调无线资源。无线资源释放消息具体可包括: 生效时间信息及 原因值。 其中, 生效时间信息具体可以是立即生效、 或一个指定的时间生 效。 原因值表示释放协调调度资源的原因。
本实施例中, 第一基站通过 UE的移动速度获知 UE处于高速状态, 对 于高速移动的 UE, 与第二基站对该 UE使用的无线资源进行协调, 从而当 该 UE穿过第二基站覆盖范围时, 虽然不发生切换, UE也不会因为第二基 站的强干扰而掉话。 换句话说, 对于高速移动的 UE, 宏基站获知 UE速度 后, 即使 UE靠近了小基站, 也不把 UE切换进入小基站, 而是继续让 UE 被宏基站服务, 既避免了不必要的切换, 提高了切换效率, 又避免了切换 失败率的增加。 并且, 通过宏基站与小基站协调无线资源, 避免了由于 UE 不切换导致的当移动到小基站的中心区时受到的小基站强烈的下行干扰问 题,也避免了由于 UE不切换导致的当靠近小基站时 UE的上行给小基站下 其他的 UE带来强烈的上行干扰问题.。
实施例二
本实施例中, 第一基站是宏基站, 第二基站是小基站, 本领域技术人 员应理解为可扩展到相反方向或宏基站之间。 假设有一场景二中, 宏基站 服务的 UE测量到小基站信号较强时, 请求小基站把 UE切换到小基站, 但 是由于小基站过载(如回程链路传输资源过载或者处理资源过载), 拒绝该 UE的切换, 即宏基站无法把需要切换的 UE切换到小基站。 假设另一场景 三中, 当宏基站服务的 UE靠近一个封闭用户组的小区时, 由于 UE没有接 入权限,宏基站无法把需要切换的 UE切换到这个小基站。随着 UE的移动, 尤其当 UE处于小基站的中心位置时,将遭受小基站强烈的下行干扰, 而可 能掉话。 同时, UE本身也会给小基站带来强烈的上行干扰。
针对场景二或者场景三, 本实施例与实施例一的区别在于: 本实施例 是根据 UE对目标小区的权限信息、 目标小区不可切换等信息,确定无法发 起向目标小区的切换、 或者目标小区不能支持该 UE的切换(或接入), 进 而向第二基站发起调度协调请求。 具体如下:
首先第一基站获知目标小区不能支持该 UE的切换(或接入;)。 具体可 以根据如下信息确定无法发起向目标小区的切换、 或者目标小区不能支持 该 UE的切换(或接入) :
该 UE不属于目标小区的用户、 或 UE不是目标封闭用户组的用户、 或 UE的封闭用户组名单与目标封闭用户组不匹配;
或者
目标小区过载, 如目标小区传输资源过载、 处理能力过载等。
其余同实施例一的步骤 33〜步骤 36。
本实施例中, 第一基站通过判断 UE无法切换, 然后与第二基站对该 U E使用的无线资源进行协调, 从而当该 UE穿过第二基站覆盖范围时, 虽然 不发生切换, 但不会因为第二基站的强干扰而掉话。
实施例三
本实施例中, 服务基站为第一基站, 是宏基站, 第二基站是小基站, 本领域技术人员应理解为可扩展到相反方向或宏基站之间。 假设有一与场 景一基本相同的场景四中, 某一高速移动的 UE移动进入了目标小区覆盖 后, 后续停留到了目标小区, 此时如果始终协调调度, 不利于资源利用率 的提升。假设有一场景五中, 某一 UE可能在两个小区之间移动, 那么有可 能在两个小区之间发生来回的切换, 即 UE在两个小区之间乒乓切换的场 景。
本实施例针对上述场景一、 场景四或者场景五, 提供了相应的降低小 区间信号干扰的方法, 以避免频繁切换。
如图 4所示, 具体步骤如下:
步骤 41、 第一基站获知 UE的移动速度。 具体详见上述实施例一中的 说明。 可选地, 对于场景五, 本步骤可省。
步骤 42、 对于高速移动的 UE, 继续以下过程。 可选地, 对于场景五, 本步骤可省。
步骤 43、 第一基站向第二基站发起切换准备请求消息, 用于让第二基 站做切换准备。 切换准备请求消息具体可不仅包括实施例一中步骤 33中协 调调度消息中携带的参数, 还包括参数:目标小区标识、 RRC Context, UE 的历史信息、 UE的承载(或业务) 的服务质量信息, 可选地, 可以进一步 包括迟滞切换时间 T1 (或者延迟切换时间、 切换等待时间)。 可选地, 可进 一步包括预切换指示。 该预切换指示用于指示所述第二基站: 所述服务基 站对所述用户设备的切换将通过后续切换消息完成, 或者用于指示所述第 二基站等待所述用户设备的后续切换消息, 或者用于指示所述第二基站所 述切换请求消息目的是协调调度。 其中, UE的承载(或业务) 的服务质量信息具体可包括: UE每个承 载的标识及 UE每个承载的服务质量(Quality of Service, Qos )参数如 Qo s分类标识 (QoS Class Identifier, QCI )、 分配与抢占优先级(Allocation and Retention Priority, ARP )、 最大比特速率及保证比特速率等。
迟滞切换时间 T1 (或者延迟切换时间、 切换等待时间)表示第二基站 等待 UE切换接入的时间。 这个时间超时即在 T1时间段内 UE未发生切换 接入或第一基站未发起切换请求,第二基站释放为 UE预留的被协调无线资 源。
步骤 44、 第二基站处理切换请求消息后, 向第一基站返回响应切换请 求消息即切换请求确认消息。 切换请求确认消息可不仅包括与实施例一步 骤 34中的参数相同, 还包括 UE的承载 (或业务) 的服务质量信息及发送 给 UE的切换命令消息。
UE的承载(或业务)的服务质量信息具体可包括至少包括可以接纳的 承载标识及每个承载的 Qos参数之一, 其中, 每个承载的 Qos参数可为 Q CI、 ARP, 最大比特速率、 保证比特速率等。
如果第二基站接受切换准备, 那么第二基站需要规避使用被协调无线 资源。
如果第二基站根据步骤 43收到的迟滞切换时间 T1设定定时器, 且定 时器超时, 则自动取消切换准备过程。 或者第二基站不设定定时器, 而是 根据上述预切换指示等待服务基站发起切换执行或切换取消消息, 当第二 基站接收到服务基站发送的切换取消息时才取消切换准备过程。
步骤 45、 第一基站收到第二基站返回的切换请求确认消息后, 使用被 协调无线资源调度该 UE。
步骤 46、 执行切换操作或取消切换准备。
具体地, 执行切换包括以下步骤:
可选地, 第一步, 第一基站向第二基站发送切换执行消息 (或者预换 准备完成消息), 告知第二基站, 将要把 UE切换到第二基站。
第二步, 第一基站向 UE发送切换命令消息, 把步骤 44中切换请求确 认消息携带的切换命令消息下发给 UE。
第一基站发起以上切换操作, 可以基于 UE被协调调度的时间以及 UE 的测量报告。 如经过一个预设的时间门限 T2之后, UE的测量报告显示: 第二基站的信号依然很强, 满足切换门限。 特别的, 这个预设的时间门限 T 2小于 T1 , 即在第二基站取消切换准备过程之前, 完成切换。
取消切换准确包括以下至少一个操作:
操作一. 第一基站向第二基站发送切换取消消息,取消之前的切换准备 过程。这个取消操作具体可以基于 UE的测量报告,如经过一个预设的时间 门限 T3之后, UE的测量报告显示, 第二基站的信号已经很弱, 对 UE的 下行干扰很小, 则发起这个取消切换准确操作。
操作二. 定时器时间到达, 自动取消。 即, 第二基站根据上述步骤 43 收到的迟滞切换时间 T 1而设置的定时器时间到达,切换准备过程自动取消。
本实施例中, 第一基站通过判断 UE速度, 决定不切换, 然后与第二基 站对该 UE使用的无线资源进行协调,从而当该 UE穿过第二基站覆盖范围, 或该 UE不断在第一基站与第二基站之间往返移动时, 不发起切换,通过协 调调度的方式降低干扰,使得 UE也不会因为第二基站的强干扰而掉话。 同 时第一基站在协调过程中, 第二基站完成了切换准备过程。从而, 当这个 U E长时间停留在第二基站时,认为出现了场景四的情况,则第一基站只需要 再发送一个切换执行消息给第二基站, 进入切换执行阶段, 即发起切换, 把 UE切入到小基站提供服务。 当这个 UE很快移动出去了第二基站时, 则 给第二基站发送消息释放被协调无线资源, 提升资源利用率。
执行切换可有两种方式, 具体地, 切换执行具体可包括:
步骤一. 第一基站向 UE发送切换命令消息,用协商的无线资源调度 U E (包括切换命令), 第一基站向 UE发送切换命令后, 释放被协调无线资 源。
步骤二. UE向第二基站接入。
步骤三. 第二基站发现 UE接入后, 使用被协调无线资源调度 UE。 或者, 切换执行为传统过程, 包括:
步骤一. 第一基站向 UE发送切换命令消息
步骤二. UE向第二基站接入。
对于上述这两种切换执行方式,通过在切换过程中协调干扰,规避了 U E在切换过程的干扰。 同时一旦 UE接入了目标小区, 目标小区开始使用之 前不使用的被协调无线资源调度 UE, 而之前的源小区给 UE下发了切换命 令后 ,就停止使用之前使用的被协调无线资源 ,使得 UE在目标小区接入时, 也避免了干扰。
上述实施例三也可应用于另外一场景六。 4叚设场景六中, 某一 UE可 能在两个小区之间移动, 那么有可能在两个小区之间发生切换, 由于切换 过程中源小区或者目标小区的信号已经发生变化, 导致干扰增加, 引起切 换失败,具体比如在 UE与源小区断开连接前, 由于源小区信号下降导致无 线链路失败或者切换命令无法接收而引起切换失败,或者比如在 UE与源小 区断开连接后, 由于源小区信号强于目标小区信号导致引入干扰无法接入 目标小区而引起切换失败。 对于这种场景, 同样在切换过程中, 通过上述 协调调度的方式, 能够降低干扰, 保证切换的成功。
可选的, 当 UE切换到第二基站后, 第二基站对该被协调无线资源继续 使用。 具体有以下几种方式:
方式一: 第二基站向第一基站发送协调指示, 告知第一基站: 第二基 站后续将继续使用被协调的无线资源, 第一基站规避使用。
方式 2: 第二基站在 UE接入后, 默认继续使用被协调的无线资源。 第 一基站进行规避。
可选地, 当 UE切换到第二基站时,第一基站对该被协调无线资源进行 释放的方式具体可以有如下几种方式:
方式一: 第二基站在 UE接入后, 向第一基站发送释放指示, 指示第一 基站释放被协调无线资源, 第一基站收到该指示后释放被协调无线资源。
方式二: 第一基站给 UE下发切换命令后,在预设的时间自动释放被协 调的无线资源。
方式 3:第一基站给 UE下发切换命令后,立即释放被协调的无线资源。 本实施例中,第一基站通过与第二基站对该 UE使用的无线资源进行协 调,从而在该 UE在第一基站与第二基站之间切换时,通过协调调度的方式 降低 UE在源小区接收下行信息 /发送上行信息时的干扰, 同时降低 UE在 目标小区接入时的干扰,使得 UE不会因为干扰而掉话。 同时第一基站与第 二基站只进行一次协调过程, 以 UE切换点为界限,通过对被协调无线资源 的使用和规避自动进行切换,实现了对 UE切换过程中在源小区和目标小区 之间产生的干扰的控制, 提升了资源协调的效率。
实施例四
本实施例针对上述场景六, 还提供了一种降低小区间信号干扰的方法, 以避免切换失败。 具体包括:
第一步、 第一基站和第二基站对某个 UE进行无线资源的协调, 具体与 实施例一的步骤 33、 步骤 34相同。
第二步、第一基站和第二基站协调好无线资源后, 第一基站开始使用被 协调的无线资源对该 UE进行调度,第二基站对该被协调的无线资源进行规 避。
第三步、第一基站决定把 UE切换到第二基站后, 向第二基站发起切换 请求。
第四步、 第一基站收到第二基站返回的切换请求确认消息后, 执行切 换操作或取消切换准确, 后续步骤与实施例三相同
本实施例中, 第一基站通过与第二基站在 UE切换前, 对该 UE使用的 无线资源进行协调或者协调一些供后续切换 UE使用的无线资源 ,从而在该 UE切换前以及在该 UE在第一基站与第二基站之间切换时, 通过协调调度 的方式降低 UE在源小区接收下行信息 /发送上行信息时的干扰, 同时降低 UE在目标小区接入时的干扰, 使得 UE不会因为干扰而掉话。 同时第一基 站与第二基站只进行一次协调, 以 UE切换时间点为界限,通过对被协调无 需资源的使用和规避自动进行变更,实现了对 UE切换过程中在源小区和目 标小区之间产生的干扰的控制, 提升了资源协调的效率。
同时, 本实施例也适用于场景四和场景五。
实施例五
本实施例与上述实施例不同, 通过无线资源配置的方式避免干扰, 适 用于上述场景一〜场景五。
如图 5所示, 具体步骤如下:
步骤 51、 为第一基站配置无线资源。
其中无线资源详见上述步骤 33中的说明。
具体地, 无线资源被第二基站分配之后, 可以继续使用, 直到第二基 站收到来自第一基站的使用请求。 配置过程可由第二基站通过信令方式配 置给第一基站。 或者, 配置过程可由运营管理和维护 (Operation, Adminis tration and Management, 0AM )系统分别对第一基站和第二基站进行无线 资源配置。
可选地, 该分配消息中有一个指示: 需要时激活, 即表示接收方需要使 用所分配的无线资源时需要发送一个指示, 之后激活分配的无线资源的使 用。
可选地, 进一步, 如果在配置无线资源之前, 第一基站已经为第二基 站配置了该无线资源, 为了避免歧义和冲突, 定义该无线资源作为第二基 站配置给第一基站的无线资源, 即对于配置重合的部分, 后来的无线资源 配置取消先前的无线资源配置, 并执行后来的无线资源配置。 特定的, 这 个无线资源可以是 ABS配置信息。
步骤 52、 第一基站向第二基站发送资源使用指示, 告知第二基站, 第 一基站开始使用步骤 51中配置的无线资源。
可选的, 第一基站发送的资源使用指示中可包含使用配置的无线资源 的时间 T6。 第一基站在 Τ6时间后不再使用配置的无线资源。
步骤 53、 第二基站收到资源使用指示后, 停止使用 (或者降低功率使 用) 步骤 51中配置的无线资源。
可选的, 如果在第二步中收到 Τ6。 则启动 Τ6定时器, Τ6时间内不再 使用该资源 (或者降低功率使用)。 时间 Τ6以后, 第二基站可以使用该无 线资源。
可选的, 第二基站收到资源使用指示后, 通知第一基站可以使用步骤 5 1中配置的无线资源。
步骤 54、 第一基站使用步骤 51中配置的无线资源调度 UE, 从而减少 了第二基站对 UE的干扰。
可选的, 第一基站向第二基站发送资源停止使用指示, 告知第二基站, 第一基站不再可以使用步骤 51中配置的无线资源。
本实施例中, 第二基站为第一基站预留无线资源, 但是这个预留的资 源仍然可以被第二基站使用。当第一基站检测到 UE穿过第二基站覆盖范围 时, 则发送消息通知第二基站激活预留的无线资源 (即第二基站不能再使 用), 然后第一基站使用这些无线资源调度穿过第二基站覆盖范围的第一基 站的服务 UE。 这样, 虽然没有发生切换, 但由于协调了无线资源, 因而 U E不会因受第二基站的强干扰而掉话。并且,只在需要时才激活预留的无线 资源, 提升了无线资源的利用率。
需要说明的是: 上述实施例涉及第一基站和第二基站之间的信令交换 都是直接的信令交互或者间接的信令交换, 间接信令交换比如说经过核心 网节点进行信息的转发。 如上述实施例三中步骤 43、 步骤 44的消息可以是 第一基站和第二基站之间直接的信令交互或者间接的信令交换, 间接信令 交换比如说经过核心网节点进行信息的转发。 并且, 用被协商无线资源调 度 UE, 具体包括调度 UE的下行信令 (比如切换命令、 随机接入响应;)、 和 / 或上行信令 (比如切换命令的上行反馈,无线资源连接建立请求)、 和 /或上下 行数据。 上述实施例中切换请求消息用于通知对方进行切换准备, 切换请 求确认消息用于通知对方切换准备完成。 上述实施例中协调无线资源过程 中携带的用户标识目的是为了两个基站之间对用户使用哪个被协调无线资 源进行协调来降低干扰。 协调无线资源过程中也可进一步携带无线资源标 识用于标识某个协调无线资源。 具体来说, 对于不切换的情况, 源基站使 用协调无线资源标识使第二基站知道是哪一个无线资源作为被协调无线资 源需要规避。 对于切换场景, 可以在后续的切换消息中, 携带真实用户标 识和协调无线资源标识来指示用户和被协调无线资源的关联关系, 以便第 二基站可以根据用户标识得到被协调无线资源, 进一步规避使用或者开始 使用。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机 可读取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序 代码的介质。
图 6为本发明实施例提供的用于降低小区间信号干扰的第一基站的结 构示意图。 如图 6所示, 第一基站包括: 协调单元 61及调度单元 62。
协调单元 61用于将所服务的用户设备的用户标识发送给相邻的第二基 站, 与所述第二基站协调无线资源, 得到调度所述用户标识对应的用户设 备的被协调无线资源, 以使与使用所述被协调资源调度所述用户标识对应 的用户设备的基站相邻的基站, 规避使用所述被协调无线资源; 户设备。
所述协调单元 61可具体用于向所述第二基站发送调度所述用户设备的 协调无线资源或无线资源标识;
或者可具体用于所述服务基站向所述第二基站发送所述用户设备的承 载的服务质量信息及调度所述用户设备的协调无线资源或无线资源标识; 或者所述协调单元 61可包括:
第一发送子单元, 用于所述服务基站向所述第二基站发送所述用户设 备的承载的服务质量信息;
第一接收子单元, 用于接收所述第二基站确定的所述被协调无线资源 的信息;
或者所述协调单元 61可包括:
第二发送子单元, 用于向所述第二基站发送所述用户设备的协调无线 资源或无线资源标识;
第二接收子单元, 用于接收所述第二基站确定的所述被协调无线资源 的信息及协调结果中的一种或组合;
或者所述协调单元 61可包括:
第三发送子单元, 用于向所述第二基站发送所述用户设备的协调无线 资源或无线资源标识, 以及所述用户设备的承载的服务质量信息;
第三接收子单元, 用于接收所述第二基站确定的所述被协调无线资源 的信息及协调结果中的一种或组合。
所述协调单元 61还可用于向所述第二基站指示占用调度所述用户设备 的无线资源的时长和 /或协调生效时间;
或者, 所述协调单元 61还可包括:
指示子单元, 用于向所述第二基站指示占用调度所述用户设备的无线 资源的时长和 /或协调生效时间;
时间获取子单元, 用于根据所述第二基站返回的消息, 获取所述被协 调无线资源的可调度时长和 /或协调生效时间。
所述协调单元 61还可用于向所述第二基站发送用于标识协调无线资源 的原因的原因值。
本发明实施例提供的第一基站还可包括: 切换判定单元, 用于在所述 协调单元与所述第二基站协调无线资源之前, 确定不将所述用户标识对应 的用户设备切换到所述第二基站。
所述切换判定单元可具体用于根据所述用户标识对应的用户设备的移 动速度, 或者根据所述用户标识对应的用户设备对所述第二基站的小区的 权限信息或所述第二基站不可切换信息, 确定不将所述用户标识对应的用 户设备切换到所述第二基站。
所述切换判定单元具体用于根据所述用户标识对应的用户设备的历史 信息得到所述用户标识对应的用户设备的移动速度;
本发明实施例提供的第一基站还可包括: 资源释放指示单元, 用于在 所述调度单元使用所述被协调无线资源调度所述用户标识对应的用户设备 之后, 向所述第二基站发送指示释放所述被协调无线资源的信息。
本发明实施例提供的第一基站还可包括: 切换请求单元及切换确认接 收单元。
切换请求单元用于在所述协调单元与所述第二基站协调无线资源之 后, 所述调度单元使用所述被协调无线资源调度所述用户标识对应的用户 设备之前, 向所述第二基站发送切换请求消息;
切换确认接收单元用于接收所述第二基站返回的所述切换请求消息的 切换请求确认消息;
相应地, 所述调度单元用于所述被协调无线资源向所述用户标识对应 的用户设备发送切换命令消息。
所述协调单元 61可具体用于通过切换请求消息与所述第二基站协调无 线资源。 所述切换请求消息中还携带有预切换指示, 所述预切换指示用于指示 所述第二基站待所述用户设备的后续切换消息。 对应的用户设备发送所述切换命令消息, 或者具体用于向所述第二基站发 送切换取消消息, 指示所述第二基站释放所述被协调无线资源的信息。
本发明实施例提供的第一基站还可包括:
切换执行单元, 用于在所述协调单元与所述第二基站协调无线资源之 后, 向所述用户设备发送所述切换命令消息;
资源规避单元, 还用于规避使用所述被协调无线资源。
本发明实施例提供的第一基站还可包括:
释放指示接收单元, 用于在所述资源规避单元规避使用所述被协调无 线资源之后, 接收所述第二基站向所述服务基站发送的指示释放所述被协 调无线资源的信息;
释放单元, 用于在所述释放指示接收单元收到所述第二基站向所述服 务基站发送的指示释放所述被协调无线资源的信息后, 释放所述被协调无 线资源。
或者, 本发明实施例提供的第一基站还可包括:
释放单元, 用于预设的时间释放所述被协调无线资源。
本实施例中, 作为服务基站的第一基站通过协调单元向相邻的第二基 站发送用户标识, 与第二基站进行无线资源协调, 以使与使用所述被协调 资源调度所述用户标识对应的用户设备的基站相邻的基站, 规避使用所述 被协调无线资源, 使得被协调无线资源不会被相邻的基站同时使用或同时 以较大功率使用, 有效降低了小区间的信号干扰。
图 7 为本发明实施例提供的用于降低小区间信号干扰的第二基站的结 构示意图。 如图 7所示, 第二基站包括: 协调单元 71及资源禁用单元 72。
协调单元 71用于接收相邻的服务基站发送的所述服务基站服务的用户 设备的用户标识, 与所述服务基站协调无线资源, 得到调度所述用户标识 对应的用户设备的被协调无线资源, 以使所述被协调无线资源仅能用于所 述用户标识对应的用户设备的调度;
资源禁用单元 72用于在所述服务基站使用所述被协调无线资源调度所 述用户标识对应的用户设备时, 规避使用所述被协调无线资源。
所述协调单元 71可具体用于接收所述服务基站发送的调度所述用户设 备的协调无线资源或无线资源标识;
或者可具体用于接收所述服务基站发送的所述用户设备的承载的服务 质量信息及调度所述用户设备的协调无线资源或无线资源标识;
或者所述协调单元 71可包括:
第一接收子单元, 用于接收所述服务基站发送的所述用户设备的承载 的服务质量信息;
第一发送子单元, 用于向所述服务基站发送确定的所述被协调无线资 源的信息;
或者所述协调单元 71可包括:
第二接收子单元, 用于接收所述服务基站发送的所述用户设备的协调 无线资源或无线资源标识;
第二发送子单元, 用于向所述服务基站发送确定的所述被协调无线资 源的信息及协调结果中的一种或组合;
或者所述协调单元 71可包括:
第三接收子单元, 用于接收所述服务基站发送的所述用户设备的协调 无线资源或无线资源标识, 以及所述用户设备的承载的服务质量信息; 第三发送子单元, 用于向所述服务基站发送确定的所述被协调无线资 源的信息及协调结果中的一种或组合。
所述协调单元 71还可用于接收所述服务基站指示的占用调度所述用户 设备的无线资源的时长和 /或协调生效时间; 或者所述协调单元 71还可包括:
时间指示接收子单元, 用于接收所述服务基站指示的占用调度所述用 户设备的无线资源的时长和 /或协调生效时间;
响应子单元, 用于向所述服务基站返回消息, 以使所述服务基站根据 返回的消息, 获取所述被协调无线资源的可调度时长和 /或协调生效时间。
所述协调单元 71还可用于接收所述服务基站发送的用于标识协调无线 资源的原因的原因值。
本发明实施例提供的第二基站还可包括:
释放接收单元, 用于在所述资源禁用单元规避使用所述被协调无线资 源之后, 接收所述服务基站发送的指示释放所述被协调无线资源的信息; 释放单元, 用于根据所述指示释放所述被协调无线资源的信息释放被 协调资源。
或者本发明实施例提供的第二基站还可包括: 释放单元, 用于根据所 述被协调无线资源的可调度时长, 自动释放所述被协调无线资源。
所述协调单元 71可通过切换请求消息及切换请求确认消息与所述服务 基站协调无线资源。 所述切换请求消息还可携带有预切换指示, 所述预切 换指示用于指示所述第二基站等待所述用户设备的后续切换消息。
本发明实施例提供的第二基站还可包括: 接入识别单元, 用于在所述 资源禁用单元规避使用所述被协调无线资源之后, 所述第二基站识别出所 述用户标识对应的用户设备接入所述第二基站;
调度单元, 用于使用所述被协调无线资源调度所述用户标识对应的用 户设备。
本发明实施例提供的第二基站还可包括:
释放指示单元, 使用所述被协调无线资源调度所述用户标识对应的用 户设备之后, 向所述服务基站发送指示释放所述被协调无线资源的信息, 以使所述服务基站释放所述被协调无线资源。 本实施例中, 第二基站通过协调单元接收相邻的作为服务基站的第一 基站发送的用户标识, 与第一基站进行无线资源协调, 以使与使用所述被 协调资源调度所述用户标识对应的用户设备的基站相邻的基站, 规避使用 所述被协调无线资源, 使得被协调无线资源不会被相邻的基站同时使用或 同时以较大功率使用, 有效降低了小区间的信号干扰。
图 8为本发明实施例提供的无线通信系统的结构示意图。 如图 8所示, 无线通信系统包括第一基站 81和第二基站 82,当某一用户设备位于第一基 站 81和第二基站 82小区的重叠区域时, 第一基站 81和第二基站 82之间 可进行无线资源的协调, 以保证被协调无线资源仅用于该用户设备的调度, 具体详见上述方法实施例中的说明。 其中第一基站 81可为上述基站实施例 中提供的任一种用于降低小区间信号干扰的第一基站, 第二基站 82可为上 述基站实施例提供的任一种用于降低小区间信号干扰的第二基站, 所述第 一基站 81与所述第二基站 82相邻。
本实施例中, 作为服务基站的第一基站通过向相邻的第二基站发送用 户标识, 与第二基站进行无线资源协调, 以使与使用所述被协调资源调度 所述用户标识对应的用户设备的基站相邻的基站, 规避使用所述被协调无 线资源, 使得被协调无线资源不会被相邻的基站同时使用或同时以较大功 率使用, 有效降低了小区间的信号干扰。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对 其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通 技术人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修 改, 或者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、 一种降低小区间信号干扰的方法, 其特征在于, 包括:
服务基站将所服务的用户设备的用户标识发送给相邻的第二基站, 与 所述第二基站协调无线资源, 得到调度所述用户标识对应的用户设备的被 协调无线资源, 以使与使用所述被协调资源调度所述用户标识对应的用户 设备的基站相邻的基站, 规避使用所述被协调无线资源;
所述服务基站使用所述被协调无线资源调度所述用户标识对应的用户 设备。
2、 根据权利要求 1所述的降低小区间信号干扰的方法, 其特征在于, 与所述第二基站协调无线资源的过程, 包括: 所述服务基站向所述第二基 站发送调度所述用户设备的协调无线资源或无线资源标识;
或者包括: 所述服务基站向所述第二基站发送所述用户设备的承载的 服务质量信息及调度所述用户设备的协调无线资源或无线资源标识;
或者包括: 所述服务基站向所述第二基站发送所述用户设备的承载的 服务质量信息; 所述服务基站接收所述第二基站确定的所述被协调无线资 源的信息;
或者包括: 所述服务基站向所述第二基站发送所述用户设备的协调无 线资源或无线资源标识; 所述服务基站接收所述第二基站确定的所述被协 调无线资源的信息及协调结果中的一种或组合;
或者包括: 所述服务基站向所述第二基站发送所述用户设备的协调无 线资源或无线资源标识, 以及所述用户设备的承载的服务质量信息; 所述 服务基站接收所述第二基站确定的所述被协调无线资源的信息及协调结果 中的一种或组合。
3、 根据权利要求 2所述的降低小区间信号干扰的方法, 其特征在于, 与所述第二基站协调无线资源的过程, 还包括:
所述服务基站向所述第二基站指示占用调度所述用户设备的无线资源 的时长和 /或协调生效时间;
或者还包括:
所述服务基站向所述第二基站指示占用调度所述用户设备的无线资源 的时长和 /或协调生效时间;
所述服务基站根据所述第二基站返回的消息, 获取所述被协调无线资 源的可调度时长和 /或协调生效时间。
4、 根据权利要求 2所述的降低小区间信号干扰的方法, 其特征在于, 与所述第二基站协调无线资源的过程, 还包括: 所述服务基站向所述第二 基站发送用于标识协调无线资源的原因的原因值。
5、 根据权利要求 1-4任一项所述的降低小区间信号干扰的方法, 其特 征在于, 与所述第二基站协调无线资源之前, 还包括: 确定不将所述用户 标识对应的用户设备切换到所述第二基站。
6、 根据权利要求 5所述的降低小区间信号干扰的方法, 其特征在于, 确定不将所述用户标识对应的用户设备切换到第二基站的过程, 包括: 根 据所述用户标识对应的用户设备的移动速度, 或者根据所述用户标识对应 的用户设备对所述第二基站的小区的权限信息或所述第二基站不可切换信 息, 所述服务基站确定不将所述用户标识对应的用户设备切换到所述第二 基站。
7、 根据权利要求 6所述的降低小区间信号干扰的方法, 其特征在于, 所述用户标识对应的用户设备的移动速度根据所述用户标识对应的用户设 备的历史信息得到。
8、 根据权利要求 1-4任一项所述的降低小区间信号干扰的方法, 其特 征在于, 所述服务基站使用所述被协调无线资源调度所述用户标识对应的 用户设备之后还包括:
向所述第二基站发送指示释放所述被协调无线资源的信息。
9、根据权利要求 1-4所述的降低小区间信号干扰的方法,其特征在于, 与所述第二基站协调无线资源之后, 还包括:
所述服务基站向所述第二基站发送切换请求消息, 接收所述第二基站 返回的所述切换请求消息的切换请求确认消息;
所述服务基站使用所述被协调无线资源调度所述用户标识对应的用户 设备的过程, 包括: 所述服务基站使用所述被协调无线资源向所述用户标 识对应的用户设备发送切换命令消息。
10、根据权利要求 1-4任一项所述的降低小区间信号干扰的方法,其特 征在于, 所述服务基站向所述第二基站发送的信息通过切换请求消息携带, 所述服务基站接收的所述第二基站发送的信息通过切换请求确认消息携 带。
11、根据权利要求 10所述的降低小区间信号干扰的方法,其特征在于, 所述切换请求消息还携带有预切换指示, 所述预切换指示用于指示所述第 二基站, 等待所述用户设备的后续切换消息。
12、根据权利要求 10所述的降低小区间信号干扰的方法,其特征在于, 所述服务基站使用所述被协调无线资源调度所述用户标识对应的用户设备 的过程, 包括: 所述服务基站使用所述被协调无线资源向所述用户标识对 应的用户设备发送所述切换命令消息;
或者包括: 所述服务基站向所述第二基站发送切换取消消息, 指示所 述第二基站释放所述被协调无线资源的信息。
13、 根据权利要求 1~4任一项所述的降低小区间信号干扰的方法, 其 特征在于, 与所述第二基站协调无线资源之后, 还包括:
所述服务基站向所述用户设备发送所述切换命令消息;
所述服务基站规避使用所述被协调无线资源。
14、根据权利要求 13所述的降低小区间信号干扰的方法,其特征在于, 所述服务基站规避使用所述被协调无线资源之后, 还包括:
所述服务基站收到所述第二基站向所述服务基站发送的指示释放所述 被协调无线资源的信息后, 释放所述被协调无线资源; 或者, 所述服务基 站在预设的时间释放所述被协调无线资源。
15、 一种降低小区间信号干扰的方法, 其特征在于, 包括:
第二基站接收相邻的服务基站发送的所述服务基站服务的用户设备的 用户标识, 与所述服务基站协调无线资源, 得到调度所述用户标识对应的 用户设备的被协调无线资源, 以使与使用所述被协调资源调度所述用户标 识对应的用户设备的基站相邻的基站, 规避使用所述被协调无线资源; 在所述服务基站使用所述被协调无线资源调度所述用户标识对应的用 户设备时, 所述第二基站规避使用所述被协调无线资源。
16、根据权利要求 15所述的降低小区间信号干扰的方法,其特征在于, 与所述服务基站协调无线资源的过程, 包括: 所述第二基站接收所述服务 基站发送的调度所述用户设备的协调无线资源或无线资源标识;
或者包括: 所述第二基站接收所述服务基站发送的所述用户设备的承 载的服务质量信息及调度所述用户设备的协调无线资源或无线资源标识; 或者包括: 所述第二基站接收所述服务基站发送的所述用户设备的承 载的服务质量信息; 所述第二基站向所述服务基站发送确定的所述被协调 无线资源的信息;
或者包括: 所述第二基站接收所述服务基站发送的所述用户设备的协 调无线资源或无线资源标识; 所述第二基站向所述服务基站发送确定的所 述被协调无线资源的信息及协调结果中的一种或组合;
或者包括: 所述第二基站接收所述服务基站发送的所述用户设备的协 调无线资源或无线资源标识, 以及所述用户设备的承载的服务质量信息; 所述第二基站向所述服务基站发送确定的所述被协调无线资源的信息及协 调结果中的一种或组合。
17、根据权利要求 16所述的降低小区间信号干扰的方法,其特征在于, 与所述服务基站协调无线资源的过程, 还包括: 所述第二基站接收所述服 务基站指示的占用调度所述用户设备的无线资源的时长和 /或协调生效时 间;
或者还包括:
所述第二基站接收所述服务基站指示的占用调度所述用户设备的无线 资源的时长和 /或协调生效时间;
所述第二基站向所述服务基站返回消息, 以使所述服务基站根据返回 的消息, 获取所述被协调无线资源的可调度时长和 /或协调生效时间。
18、根据权利要求 16所述的降低小区间信号干扰的方法,其特征在于, 与所述服务基站协调无线资源的过程, 还包括: 所述第二基站接收所述服 务基站发送的用于标识协调无线资源的原因的原因值。
19、根据权利要求 15-18任一项所述的降低小区间信号干扰的方法,其 特征在于, 所述第二基站规避使用所述被协调无线资源之后, 还包括: 所述第二基站接收所述服务基站发送的指示释放所述被协调无线资源 的信息; 所述第二基站根据所述指示释放所述被协调无线资源的信息释放 被协调资源;
或者, 所述第二基站根据所述被协调无线资源的可调度时长, 自动释 放所述被协调无线资源。
20、根据权利要求 15-18任一项所述的降低小区间信号干扰的方法,其 特征在于, 所述第二基站从所述服务基站接收的信息通过切换请求消息携 带, 所述第二基站向所述服务基站发送的信息通过切换请求确认消息携带。
21、根据权利要求 20所述的降低小区间信号干扰的方法,其特征在于, 所述切换请求消息还携带有预切换指示, 所述预切换指示用于指示所述第 二基站等待所述用户设备的后续切换消息。
22、根据权利要求 20所述的降低小区间信号干扰的方法,其特征在于, 所述第二基站规避使用所述被协调无线资源之后, 还包括:
所述第二基站识别出所述用户标识对应的用户设备接入所述第二基 站, 使用所述被协调无线资源调度所述用户标识对应的用户设备。
23、根据权利要求 22所述的降低小区间信号干扰的方法,其特征在于, 所述第二基站向所述服务基站发送指示释放所述被协调无线资源的信 息, 以使所述服务基站释放所述被协调无线资源。
24、 一种用于降低小区间信号干扰的第一基站, 其特征在于, 包括: 协调单元, 用于将所服务的用户设备的用户标识发送给相邻的第二基 站, 与所述第二基站协调无线资源, 得到调度所述用户标识对应的用户设 备的被协调无线资源, 以使与使用所述被协调资源调度所述用户标识对应 的用户设备的基站相邻的基站, 规避使用所述被协调无线资源;
调度单元, 用于使用所述被协调无线资源调度所述用户标识对应的用 户设备。
25、 根据权利要求 24所述的基站, 其特征在于, 所述协调单元具体用 于向所述第二基站发送调度所述用户设备的协调无线资源或无线资源标 识;
或者具体用于所述服务基站向所述第二基站发送所述用户设备的承载 的服务质量信息及调度所述用户设备的协调无线资源或无线资源标识; 或者所述协调单元包括:
第一发送子单元, 用于所述服务基站向所述第二基站发送所述用户设 备的承载的服务质量信息;
第一接收子单元, 用于接收所述第二基站确定的所述被协调无线资源 的信息;
或者所述协调单元包括:
第二发送子单元, 用于向所述第二基站发送所述用户设备的协调无线 资源或无线资源标识;
第二接收子单元, 用于接收所述第二基站确定的所述被协调无线资源 的信息及协调结果中的一种或组合;
或者所述协调单元包括:
第三发送子单元, 用于向所述第二基站发送所述用户设备的协调无线 资源或无线资源标识, 以及所述用户设备的承载的服务质量信息;
第三接收子单元, 用于接收所述第二基站确定的所述被协调无线资源 的信息及协调结果中的一种或组合。
26、 根据权利要求 25所述的基站, 其特征在于, 所述协调单元还用于 向所述第二基站指示占用调度所述用户设备的无线资源的时长和 /或协调生 效时间;
或者, 所述协调单元还包括:
指示子单元, 用于向所述第二基站指示占用调度所述用户设备的无线 资源的时长和 /或协调生效时间;
时间获取子单元, 用于根据所述第二基站返回的消息, 获取所述被协 调无线资源的可调度时长和 /或协调生效时间。
27、 根据权利要求 25所述的基站, 其特征在于, 所述协调单元还用于 向所述第二基站发送用于标识协调无线资源的原因的原因值。
28、 根据权利要求 24-27任一项所述的基站, 其特征在于, 还包括: 切换判定单元, 用于在所述协调单元与所述第二基站协调无线资源之 前, 确定不将所述用户标识对应的用户设备切换到所述第二基站。
29、 根据权利要求 28所述的基站, 其特征在于, 所述切换判定单元具 体用于根据所述用户标识对应的用户设备的移动速度, 或者根据所述用户 标识对应的用户设备对所述第二基站的小区的权限信息或所述第二基站不 可切换信息, 确定不将所述用户标识对应的用户设备切换到所述第二基站。
30、 根据权利要求 29所述的基站, 其特征在于, 所述切换判定单元具 体用于根据所述用户标识对应的用户设备的历史信息得到所述用户标识对 应的用户设备的移动速度。
31、 根据权利要求 24-27任一项所述的基站, 其特征在于, 还包括: 度所述用户标识对应的用户设备之后, 向所述第二基站发送指示释放所述 被协调无线资源的信息。
32、 根据权利要求 24-27任一项所述的基站, 其特征在于, 还包括: 切换请求单元, 用于在所述协调单元与所述第二基站协调无线资源之 后, 所述调度单元使用所述被协调无线资源调度所述用户标识对应的用户 设备之前, 向所述第二基站发送切换请求消息;
切换确认接收单元, 用于接收所述第二基站返回的所述切换请求消息 的切换请求确认消息;
所述调度单元, 用于所述被协调无线资源向所述用户标识对应的用户 设备发送切换命令消息。
33、根据权利要求 24-27任一项所述的基站, 其特征在于, 所述协调单 元具体用于通过切换请求消息与所述第二基站协调无线资源。
34、 根据权利要求 33所述的基站, 其特征在于, 所述切换请求消息中 还携带有预切换指示, 所述预切换指示用于指示所述第二基站待所述用户 设备的后续切换消息。
35、根据权利要求 24-27任一项所述的基站, 其特征在于, 所述调度单 元具体用于使用所述被协调无线资源向所述用户标识对应的用户设备发送 所述切换命令消息, 或者具体用于向所述第二基站发送切换取消消息, 指 示所述第二基站释放所述被协调无线资源的信息。
36、 根据权利要求 35所述的基站, 其特征在于, 还包括:
切换执行单元, 用于在所述协调单元与所述第二基站协调无线资源之 后, 向所述用户设备发送所述切换命令消息;
资源规避单元, 还用于规避使用所述被协调无线资源。
37、 根据权利要求 36所述的基站, 其特征在于, 还包括: 释放指示接收单元, 用于在所述资源规避单元规避使用所述被协调无 线资源之后, 接收所述第二基站向所述服务基站发送的指示释放所述被协 调无线资源的信息;
释放单元, 用于在所述释放指示接收单元收到所述第二基站向所述服 务基站发送的指示释放所述被协调无线资源的信息后, 释放所述被协调无 线资源;
或者, 所述基站还包括:
释放单元, 用于预设的时间释放所述被协调无线资源。
38—种用于降低小区间信号干扰的第二基站, 其特征在于, 包括: 协调单元, 用于接收相邻的服务基站发送的所述服务基站服务的用户 设备的用户标识, 与所述服务基站协调无线资源, 得到调度所述用户标识 对应的用户设备的被协调无线资源, 以使与使用所述被协调资源调度所述 用户标识对应的用户设备的基站相邻的基站, 规避使用所述被协调无线资 源;
资源禁用单元, 用于在所述服务基站使用所述被协调无线资源调度所 述用户标识对应的用户设备时, 规避使用所述被协调无线资源。
39、 根据权利要求 38所述的基站, 其特征在于, 所述协调单元具体用 于接收所述服务基站发送的调度所述用户设备的协调无线资源或无线资源 标识;
或者具体用于接收所述服务基站发送的所述用户设备的承载的服务质 量信息及调度所述用户设备的协调无线资源或无线资源标识;
或者所述协调单元包括:
第一接收子单元, 用于接收所述服务基站发送的所述用户设备的承载 的服务质量信息;
第一发送子单元, 用于向所述服务基站发送确定的所述被协调无线资 源的信息; 或者所述协调单元包括:
第二接收子单元, 用于接收所述服务基站发送的所述用户设备的协调 无线资源或无线资源标识;
第二发送子单元, 用于向所述服务基站发送确定的所述被协调无线资 源的信息及协调结果中的一种或组合;
或者所述协调单元包括:
第三接收子单元, 用于接收所述服务基站发送的所述用户设备的协调 无线资源或无线资源标识, 以及所述用户设备的承载的服务质量信息; 第三发送子单元, 用于向所述服务基站发送确定的所述被协调无线资 源的信息及协调结果中的一种或组合。
40、 根据权利要求 39所述的基站, 其特征在于, 所述协调单元还用于 接收所述服务基站指示的占用调度所述用户设备的无线资源的时长和 /或协 调生效时间;
或者所述协调单元还包括:
时间指示接收子单元, 用于接收所述服务基站指示的占用调度所述用 户设备的无线资源的时长和 /或协调生效时间;
响应子单元, 用于向所述服务基站返回消息, 以使所述服务基站根据 返回的消息, 获取所述被协调无线资源的可调度时长和 /或协调生效时间。
41、 根据权利要求 39所述的基站, 其特征在于, 所述协调单元还用于 接收所述服务基站发送的用于标识协调无线资源的原因的原因值。
42、 根据权利要求 38-41任一项所述的基站, 其特征在于, 还包括: 释放接收单元, 用于在所述资源禁用单元规避使用所述被协调无线资 源之后, 接收所述服务基站发送的指示释放所述被协调无线资源的信息; 释放单元, 用于根据所述指示释放所述被协调无线资源的信息释放被 协调资源;
或者所述基站还包括: 释放单元, 用于根据所述被协调无线资源的可调度时长, 自动释放所 述被协调无线资源。
43、根据权利要求 38-41任一项所述的基站, 其特征在于, 所述协调单 元通过切换请求消息及切换请求确认消息与所述服务基站协调无线资源。
44、 根据权利要求 43所述的基站, 其特征在于, 所述切换请求消息还 携带有预切换指示, 所述预切换指示用于指示所述第二基站等待所述用户 设备的后续切换消息。
45、 根据权利要求 43所述的基站, 其特征在于, 还包括:
接入识别单元, 用于在所述资源禁用单元规避使用所述被协调无线资 源之后, 所述第二基站识别出所述用户标识对应的用户设备接入所述第二 基站;
调度单元, 用于使用所述被协调无线资源调度所述用户标识对应的用 户设备。
46、 根据权利要求 45所述的基站, 其特征在于, 还包括:
释放指示单元, 使用所述被协调无线资源调度所述用户标识对应的用 户设备之后, 向所述服务基站发送指示释放所述被协调无线资源的信息, 以使所述服务基站释放所述被协调无线资源。
47、 一种无线通信系统, 其特征在于, 包括上述权利要求 24-37任一项 所述的用于降低小区间信号干扰的第一基站及上述权利要求 38-46任一项 所述的用于降低小区间信号干扰的第二基站, 所述第一基站与所述第二基 站相邻。
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