WO2012062225A2 - 一种异构网络中寻呼资源协调方法及基站、系统 - Google Patents

一种异构网络中寻呼资源协调方法及基站、系统 Download PDF

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Publication number
WO2012062225A2
WO2012062225A2 PCT/CN2012/070179 CN2012070179W WO2012062225A2 WO 2012062225 A2 WO2012062225 A2 WO 2012062225A2 CN 2012070179 W CN2012070179 W CN 2012070179W WO 2012062225 A2 WO2012062225 A2 WO 2012062225A2
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WIPO (PCT)
Prior art keywords
base station
paging
subframe
frame
information
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PCT/CN2012/070179
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English (en)
French (fr)
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WO2012062225A3 (zh
Inventor
白伟
余政
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to RU2013126523/08A priority Critical patent/RU2556444C2/ru
Priority to EP12719918.0A priority patent/EP2632217A2/en
Publication of WO2012062225A2 publication Critical patent/WO2012062225A2/zh
Publication of WO2012062225A3 publication Critical patent/WO2012062225A3/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a paging resource coordination method, a base station, and a system in a heterogeneous network.
  • a macro base station and a low power base station can be simultaneously deployed in the same network cell.
  • This type of network is called a Heterogeneous Network (HN).
  • the low power base station may include, but is not limited to, a micro base station, a pico base station, and a relay station.
  • the low-power base station can be used to cover the hotspot area, indoor, blind spot area or cell edge of the cell, and can improve the average cell throughput, cell edge throughput, and the like.
  • the macro base station and the low power base station are usually configured with the same spectrum resources, which causes mutual interference between the macro base station and the low power base station.
  • the macro base station (interfering base station) generates paging interference for the user equipment (UE) served by the low power base station (target base station); likewise, the low power base station (interfering base station) also applies to the macro base station.
  • the serving UE generates paging interference.
  • a paging resource coordination method and a base station in a heterogeneous network are provided, which can avoid paging interference to a UE in a connected state in a heterogeneous network, and reduce resource waste of the interfering cell.
  • An aspect of the present invention provides a paging resource coordination method in a heterogeneous network, including: a first base station determining a user terminal in a connected state; the first base station calculating a subframe number of a subframe used to send paging information, and the The frame number of the paging frame to which the subframe belongs, the paging information is used to page the user terminal in the connected state; the first base station sends the calculated subframe number and the paging frame to the second base station. And forming the approximate null subframe, or causing the second base station to stop transmitting the information in the subframe corresponding to the subframe number in the paging frame corresponding to the frame number.
  • the base station includes: a determining unit, configured to determine a user terminal in a connected state; and a calculating unit, configured to calculate, for sending, searching The subframe number of the subframe of the call information and the frame number of the paging frame to which the subframe belongs, the paging information is used to page the user terminal determined by the determining unit and in the connected state; and the sending unit is configured to Transmitting, by the second base station, the subframe number calculated by the calculating unit and the frame of the paging frame into an approximate null subframe, or stopping the second base station to stop in the subframe number corresponding to the paging frame corresponding to the frame number Send information in the sub-frame.
  • a further aspect of the present invention provides a coordination system for a paging resource in a heterogeneous network, including the foregoing base station as a first base station, and a second base station, configured to
  • the first base station after determining the user terminal in the connected state, calculates a subframe number of a subframe required for paging the user terminals, and a frame number of the paging frame to which the subframe belongs, and Transmitting the calculated subframe number and the frame number of the paging frame to the second base station, so that the second base station may configure the subframe corresponding to the subframe number in the paging frame corresponding to the frame number to be approximately an empty subframe. Or stopping the paging interference of the user terminal in the connected state in the first base station at the upper station.
  • the foregoing technical solution provided by the embodiment of the present invention can eliminate the paging interference of the second base station to the connected user terminal in the first base station, and prevent the paging information of the user terminal in the connected state in the first base station from being interfered by the second base station. .
  • the technical solution is to coordinate the paging resources of the user terminals in the connected state, and not to coordinate the paging resources of the idle state user terminals that are usually less interfered by the paging, all the connections and idle states are avoided.
  • the user terminals all waste resources caused by paging resource coordination.
  • FIG. 1 is a schematic diagram of a paging interference between a macro base station and a low power base station in the prior art
  • FIG. 2 is a schematic flowchart of a paging resource coordination method in a heterogeneous network according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a scene of paging interference between a macro base station and a pico base station according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a scenario of paging interference between another macro base station and a pico base station according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of another base station according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a paging resource coordination system in a heterogeneous network according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart diagram of a method for eliminating paging interference in a heterogeneous network according to an embodiment of the present invention. Wherein, the method may include the following steps.
  • the first base station determines the UE in the connected state.
  • the first base station may be a macro base station, or may be a low-power base station such as a micro base station, a pico base station, and a relay station, which is not limited in the embodiment of the present invention.
  • the UEs within its coverage are in an idle state or a connected state.
  • the main work of the UE in the idle state is to monitor the broadcast information, the control information, the paging information, and the like sent by the first base station, and the main work of the UE in the connected state is to exchange data information, service information, and the like with the first base station. Therefore, for the first base station, by monitoring the working state of the UE, it can be determined that the UE is currently in an idle state or in a connected state.
  • the first base station calculates a subframe number of the subframe used for sending the paging information, and a frame number of the paging frame to which the subframe belongs, where the paging information is used to page the UE in the connected state.
  • paging is implemented by a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH).
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • P-RNTI Paging-Radio Network Temporary Identifier
  • the call information is transmitted on one or more of the subframes 0, 1, 5, 6 of each radio frame.
  • FDD Frequency Division Duplexing
  • paging information is in each radio frame. Transmission on one or more of the subframes 0, 4, 5, 9.
  • a base station transmits paging information through a subframe and a paging frame to which the subframe belongs, for example: For a Time Division Duplexing (TDD) system, paging information is in each radio frame. For transmission in one or more subframes of subframes 0, 1, 5, 6, for a Frequency Division Duplexing (FDD) system, paging information is in subframes 0, 4, 5 of each radio frame, Transmission on one or more subframes in 9.
  • the paging is implemented by a physical downlink control channel (PDCCH) and a physical downlink sharing channel (PDSCH).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink sharing channel
  • the Paging-Radio Network Temporary Identifier (P-RNTI) is used for the BER on the PDCCH, and the UE monitors the PDCCH using the P-RNTI. In this way, the subsequent UE can use the P-RNTI to descramble the monitored PDCCH, and after reading the PDCCH scheduling correctly, the PDSCH of the PDCCH scheduling indication is obtained, and the related data (including the UE's equivalent identifier UE_ID) is obtained on the PDSCH. And the paging channel (Paging Channel, PCH) is transmitted to the medium access control layer to implement paging of the UE by the base station.
  • P-RNTI Paging-Radio Network Temporary Identifier
  • the first base station may calculate a paging opportunity i_s for transmitting paging information according to the preset paging parameter nB; and then further determine, according to the paging opportunity i_s, for sending the search The subframe number of the subframe in which the message is called.
  • the first base station is configured according to pre-configured paging parameters.
  • the nB calculates the paging opportunity i_S for transmitting the paging information, and determines the specific implementation manner of the subframe number of the subframe used for transmitting the paging information according to the paging opportunity i-S:
  • the first base station calculates a paging opportunity i_s for transmitting paging information according to the following formula (1).
  • I- s floor ( UE — ID IN ) mod N s ( 1 )
  • floor ( * ) indicates rounding, that is, an integer representing the quotient of UE_ID / N; UE_ID indicates the equivalent identifier of the UE in the connected state; N takes T and the paging parameter pre-configured by the first base station
  • the paging parameter nB pre-configured by the first base station may have a value range of ⁇ 4T, 2T, ⁇ , T/2, T/4, T/8, T/16, T/32 ⁇ .
  • the nB may be pre-configured in the target base station by high-level signaling; the value of T may be ⁇ 32, 64, 128, 256 ⁇ , and the unit is a frame.
  • each UE has a specific paging period T s , and the value of T s can be ⁇ 32, 64, 128, 256 ⁇ , and the unit is a frame; at the same time, each base station also covers The range of UE broadcast non-continuous reception (DRX) periods T e , T e may be in the range of ⁇ 32, 64, 128, 256 ⁇ , and the unit is a frame. Therefore, for a certain UE, the actual paging period T can specifically take the minimum value between the broadcast DRX cycle 1 and the specific paging cycle 1 ⁇ .
  • DRX UE broadcast non-continuous reception
  • the broadcast DRX period T e of the first base station is 128 frames
  • the specific paging period T s of the UE in the connected state of the first base station is 64 frames
  • the UE-ID of the UE in the connected state of the first base station may specifically take the international mobile subscriber identity of the UE (International Mobile
  • the first base station acquires the subframe number of the subframe for transmitting the paging information from the stored correspondence between the i-s and the subframe number according to the calculated i-s.
  • the first base station may obtain, from the correspondence between the i_s and the subframe number shown in Table 1 or Table 2, The subframe number of the subframe in which the paging information is transmitted.
  • Table 1 corresponds to the LTE TDD system
  • Table 2 corresponds to the LTE FDD system.
  • Table 1 it can be seen from Table 1 that the subframe used by the first base station to transmit paging information is specifically a subframe. 0 (that is, the subframe number is 0).
  • the first base station may calculate the frame number of the paging frame used to transmit the paging information according to the pre-configured paging parameter nB.
  • each paging frame includes 10 subframes, wherein each paging frame can be transmitted using one of the subframe 0, the subframe 1, the subframe 5, and the subframe 6 Paging information.
  • the first base station calculates the frame number of the paging frame to which the subframe for transmitting the paging information belongs according to the pre-configured paging parameter nB, specifically: the first base station calculates the first base station according to the following formula (2). a frame number SFN of a paging frame to which a subframe for transmitting paging information belongs;
  • the SFN indicates the frame number of the paging frame to which the subframe used by the first base station to transmit the paging information belongs; T indicates the actual paging cycle of the UE in the connected state in the first base station; and the UE_ID indicates the first base station.
  • the equivalent identifier UE_ID is different, so the equivalent identifier UE-ID in formula (3) can be considered as a variable. It can be seen from the above formula (3) that, in order to support paging of all connected UEs in its coverage, the paging frame SFN includes all paging frames in the resource, that is, the first base station calculates The set of paging frames to which the subframe for transmitting paging information belongs is all paging frames.
  • the set of paging frames to which the subframe for transmitting paging information calculated by the first base station belongs is all even frames.
  • the set of paging frames to which the subframe for transmitting paging information calculated by the first base station belongs is a paging frame whose SFN is equal to an integral multiple of all four.
  • the first base station sends the calculated subframe number and the frame number of the paging frame to the second base station, so that the first
  • ABS no blank subframe
  • the impact of the approximate null subframe (ABS) on the paging interference is extremely small, negligible, or the impact on the paging interference is within the allowable range.
  • 3GPP 3rd Generation Partnership Project
  • the second base station after receiving the subframe number sent by the first base station and the frame number of the paging frame, the second base station may be in the paging frame corresponding to the frame number and the subframe number.
  • the subframe is configured to approximate the null subframe to avoid paging interference to the user terminal in the connected state in the first base station.
  • the second base station sends information on the subframe that receives the subframe number sent by the first base station, and avoids paging interference to the user terminal in the connected state in the first base station.
  • the first base station may send the calculated subframe number and the frame number of the paging frame to the second base station through an interface with the second base station, or the first base station may also calculate through other dedicated channels.
  • the subframe number and the frame number of the paging frame are sent to the second base station, which is not limited in the embodiment of the present invention.
  • the interface between the first base station and the second base station includes a wired interface and a wireless interface, which are not limited in the embodiment of the present invention.
  • the first base station may send the calculated subframe number and the frame number of the paging frame to which the subframe belongs to the second base station by using the notification signaling, where the notification signaling adopts a bit mapping manner.
  • the length of the notification information the indication period (in frames) X ( nB / T ) of the notification signaling.
  • the second base station may further send configuration information of the approximate null subframe to the first base station.
  • the second base station may send configuration information of the approximate null subframe to the first base station by using the notification signaling, where the notification signaling may be merged into the notification signaling for protecting the data transmission or the broadcast signal transmission, or Was sent separately.
  • the first base station and the second base station are base stations located in a heterogeneous network, and therefore, the coverage of the first base station and the coverage of the second base station are intersected, and the spectrum resources and the first base station are configured.
  • the spectrum resources configured by the two base stations are completely or partially the same.
  • the first base station may be a macro base station, or may be a low-power base station such as a micro base station, a pico base station, and a relay station, which is not limited in the embodiment of the present invention.
  • the first base station in the foregoing step 201 determines that the user terminal in the connected state is specifically implemented by: the first base station determines that it is in a connected state, and the signal to interference ratio (SIR) A UE that is less than or equal to a preset threshold.
  • SIR signal to interference ratio
  • the preset threshold of the SIR may be preset to -4 dB on the first base station, where the preset threshold of the SIR is -4 dB indicating the maximum interference limit that the first base station can tolerate;
  • the UE with the SIR less than or equal to -4 dB may be further selected from the determined UEs in the connected state, and then the sub-required UE for paging the selected UE is calculated by the foregoing method.
  • the preset threshold value of the SIR may be preset according to the actual scenario in which the first base station is located, and is not limited to -4 dB, for example, may also be -5 dB, -6 dB, etc., in the embodiment of the present invention. Not limited.
  • the second base station when the UE determined by the first base station is in the connected state, and the SIR is less than or equal to the preset threshold, the second base station may be in the connected state in the first base station, and the SIR is less than or equal to the pre-
  • the subframes in the paging frame corresponding to the thresholded UE are configured to be approximately empty subframes, and the subframes in the paging frames corresponding to all the UEs in the connected state in the first base station need not be configured to be approximately null subframes;
  • paging interference of a UE in a connected state and having a SIR less than or equal to a preset threshold may be avoided, and resource waste of the interfering cell is further reduced.
  • the first base station calculates a subframe number of a subframe required for paging the UEs and a frame number of the paging frame to which the subframe belongs, and calculates The outbound subframe number and the frame number of the paging frame are sent to the second base station, so that the second base station can configure the subframe corresponding to the subframe number in the paging frame corresponding to the frame number to be approximately an empty subframe, which can be avoided.
  • the second base station interferes with paging of the user terminal in the connected state in the first base station.
  • the embodiment of the present invention only protects the paging information of the UE in the connected state in the first base station, and does not need to protect the paging information of all the UEs in the first base station; accordingly, the second base station may be in the connected state in the first base station.
  • the subframes in the paging frame corresponding to the UE are configured to be approximately empty subframes, and the subframes in the paging frames corresponding to all the UEs in the first base station need not be configured to be approximately empty subframes; thus, the embodiment of the present invention can avoid Paging interference to UEs in connected state in a heterogeneous network, while reducing resource waste of interfering cells.
  • Embodiment 1
  • FIG. 3 is a paging between a macro base station and a pico base station according to Embodiment 1 Schematic diagram of the interference scene.
  • a macro base station and a pico base station are simultaneously present in the heterogeneous network.
  • the macro base station determines that the user terminal in the connected state is the UE, and the UE is interfered by the paging of the pico base station, that is, the macro base station serves as the first base station, and the pico base station serves as the second base station.
  • the paging opportunity i_s of the macro base station for transmitting paging information is calculated to be 0, and Table 1 is taken as an example to show that the macro base station is used.
  • the subframe in which the paging information is transmitted is a subframe with a subframe number of 0.
  • the macro base station may calculate the subframe 0 for transmitting the paging information through the interface with the pico base station.
  • the subframe number and the frame number of all paging frames to which the subframe 0 belongs are sent to the pico base station.
  • the pico base station After the pico base station receives the subframe number of the subframe 0 sent by the macro base station for transmitting the paging information and the frame number of all the paging frames to which the subframe 0 belongs, the pico base station transmits the subframe number in all the paging frames.
  • a subframe of 0 is configured to approximate an empty subframe. Therefore, paging interference of the pico base station to the UE in the connected state in the macro base station can be avoided.
  • the pico base station may send configuration information of the approximate null subframe to the macro base station.
  • the macro base station may calculate the subframe number of the subframe required for paging the UEs in the connected state and the frame number of the paging frame to which the subframe belongs. Transmitting the calculated subframe number and the frame number of the paging frame to the pico base station, so that the pico base station can configure the subframe corresponding to the subframe number in the paging frame corresponding to the frame number to be an approximately null subframe. Paging interference of the pico base station to the UE in the connected state in the macro base station can be avoided.
  • the embodiment of the present invention only protects the paging information of the UE in the connected state in the macro base station, and does not need to protect the paging information of all the UEs in the macro base station; accordingly, the pico base station may correspond to the UE in the connected state in the macro base station.
  • the subframes in the paging frame are configured to be approximate to the null subframes, and the subframes in the paging frames corresponding to all the UEs in the macro base station need not be configured to be approximately null subframes. Therefore, the embodiment of the present invention can avoid the heterogeneous network.
  • the paging interference of the UE in the connected state reduces the waste of resources of the interfering cell.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 4 is a paging between a macro base station and a pico base station according to Embodiment 2 Schematic diagram of the interference scene.
  • a macro base station and a pico base station are simultaneously present in the heterogeneous network.
  • the user terminals in the connected state of the pico base station are UE1 and UE2, and UE1 and UE2 are interfered by the macro base station, that is, the pico base station is used as the first base station, and the macro base station is used as the second base station.
  • the subframe used by the pico base station to send the paging information to the UE 1 is the subframe 0;
  • the paging opportunity of 2 is 0.
  • the subframe used by the pico base station to send paging information to UE2 is subframe 0.
  • the pico base station After calculating the subframe 0 for transmitting the paging information to the UE1 and the paging frame 12 to which the subframe 0 belongs, the pico base station can calculate the sub-send for transmitting the paging information through the interface with the macro base station.
  • the subframe number of the frame 0 and the frame number of the paging frame 12 to which the subframe 0 belongs are transmitted to the macro base station; likewise, the subframe 0 for transmitting the paging information to the UE2 and the paging frame to which the subframe 0 belongs are calculated.
  • the pico base station can transmit, to the macro base station, the subframe number of the subframe 0 for transmitting the paging information and the frame number of the paging frame 37 to which the subframe 0 belongs by using an interface with the macro base station.
  • the macro base station After receiving the subframe number of the subframe 0 sent by the pico base station for transmitting the paging information and the frame number of the paging frame 12 to which the subframe 0 belongs and the frame number of the paging frame 37, the macro base station will search for the macro base station.
  • the subframe 0 in the call frame 12 and the paging frame 37 is configured to be approximately an empty subframe, so that the macro base station can avoid paging interference to the user terminal in the connected state in the pico base station.
  • the paging information that is, the macro base station is required to configure the subframe to be an approximate null subframe, to avoid paging interference of the macro base station to the UE in the connected state in the pico base station.
  • the pico base station may calculate the subframe number of the subframe required for paging the UEs in the connected state and the frame number of the paging frame to which the subframe belongs. Transmitting the calculated subframe number and the frame number of the paging frame to the macro base station, so that the macro base station can configure the subframe corresponding to the subframe number in the paging frame corresponding to the frame number to be approximately an empty subframe. The paging interference of the macro base station to the UE in the connected state in the pico base station can be avoided.
  • the embodiment of the present invention only protects the paging information of the UE in the connected state in the pico base station, and does not need to protect the paging information of all the UEs in the pico base station; correspondingly, the macro base station may correspond to the UE in the connected state in the pico base station.
  • the subframes in the paging frame are configured to be approximately empty subframes, and the subframes in the paging frames corresponding to all the UEs in the pico base station need not be configured to be approximately empty subframes. Therefore, the embodiment of the present invention can avoid the heterogeneous network.
  • the paging interference of the UE in the connected state reduces the resource waste of the interfering cell.
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present disclosure, where the method is applied to a heterogeneous network, and the steps in the foregoing method embodiments may be implemented.
  • the base station includes: a determining unit 501, a calculating unit 502, and a transmitting unit 503.
  • the determining unit 501 is configured to determine a user terminal that is in a connected state; the calculating unit 502 is configured to calculate a subframe number of a subframe used to send the paging information, and a frame number of the paging frame to which the subframe belongs, where The paging information is used by the UE determined by the paging determining unit 501; the sending unit 503 is configured to configure the subframe number calculated by the calculating unit 502 and the frame number of the paging frame to be approximated as an empty subframe, or to make the second The base station stops transmitting information in the subframe corresponding to the subframe number in the paging frame corresponding to the frame number.
  • the determining unit 501 is further configured to determine a UE that is in a connected state and whose SIR is less than or equal to a preset threshold.
  • the sending unit 503 is specifically configured to send, by using the notification signaling, the subframe number calculated by the calculating unit 502 and the frame number of the paging frame to the second base station, where the notification signaling adopts a bit mapping manner.
  • the length of the notification information the indication period X (nB/T) of the notification signaling.
  • the second base station may further send configuration information of the approximate null subframe to the local base station.
  • the second base station may send the configuration of the approximate null subframe to the local station by using the notification signaling, where the notification signaling may be merged into the communication for protecting the data transmission or the broadcast signal transmission. Sent in the signaling, or sent separately.
  • the base station and the second base station provided by the embodiment of the present invention are base stations located in a heterogeneous network. Therefore, the coverage of the base station provided by the embodiment of the present invention is different from the coverage of the second base station, and is provided by the embodiment of the present invention.
  • the spectrum resources configured by the base station are completely or partially the same as the spectrum resources configured by the second base station.
  • FIG. 6 is a schematic structural diagram of another base station according to an embodiment of the present invention, which is applied to a heterogeneous network.
  • the base station shown in FIG. 6 is obtained by refining the base station shown in FIG. 5.
  • the calculating unit 502 can include:
  • a second subunit 5022 configured to acquire, according to the i-s calculated by the first subunit 5021, a subframe number of a subframe used for transmitting paging information from a correspondence between the saved i_s and the subframe number;
  • the above floor (*) represents a rounding operation
  • the UE_ID represents an equivalent identifier of the user terminal
  • N takes the minimum value between the actual paging cycle T of the user terminal and the preset paging parameter nB
  • N s takes the maximum value between 1 and nB/T
  • mod represents the modulo operation
  • the value range of nB is ⁇ 4T, 2T, ⁇ , T/2, T/4, T/8, T/16, T/32 ⁇ .
  • the determining unit 501 calculates the subframe number of the subframe required for paging the UEs and the frame number of the paging frame to which the subframe belongs. And the transmitting unit 503 configures the subframe number calculated by the calculating unit 502 and the subframe number of the paging frame to be approximated as an empty subframe, or stops the subframe number in the paging frame corresponding to the frame number. By transmitting information in the corresponding subframe, paging interference of the second base station to the UE in the connected state in the base station may be avoided.
  • the embodiment of the present invention can only protect the paging information of the UE in the connected state in the base station, and does not need to protect the paging information of all the UEs in the base station; accordingly, the second base station can correspond to the UE in the connected state in the base station.
  • the subframes in the paging frame are configured to be approximately null subframes, and the subframes in the paging frames corresponding to all the UEs in the base station are not configured to be approximately null subframes; thus, the embodiment of the present invention can avoid heterogeneous networks. Paging interference of UEs in connected state, while reducing resource waves of interfering cells Fee.
  • FIG. 7 is a schematic structural diagram of a paging resource coordination system in a heterogeneous network according to an embodiment of the present invention.
  • the system may include: a first base station 701 and a second base station 702.
  • the foregoing first base station 701 may be a macro base station, or may be a low-power base station such as a micro base station, a pico base station, and a relay station, which is not limited in the embodiment of the present invention
  • the second base station 702 may be a macro base station, a micro base station, or a pico
  • a low-power base station such as a base station and a relay station is not limited in the embodiment of the present invention.
  • the first base station 701 is configured to determine a UE in a connected state, and calculate a subframe number of a subframe for transmitting paging information and a frame number of a paging frame to which the subframe belongs, where the foregoing paging
  • the information is used to page the UE in the connected state in the first base station 701; the first base station 701 sends the calculated subframe number and the frame number of the paging frame to the second base station 702.
  • the second base station 702 is configured to receive the subframe number sent by the first base station 701 and the frame number of the paging frame, and configure the subframe corresponding to the subframe number in the paging frame corresponding to the frame number to be an approximate null subframe. Or stopping transmitting the information in the subframe corresponding to the subframe number in the paging frame corresponding to the frame number.
  • the first base station 701 may send the calculated subframe number and the frame number of the paging frame to the second base station 702 through an interface with the second base station 702, or the first base station 701 may also pass other dedicated
  • the channel sends the calculated subframe number and the frame number of the paging frame to the second base station 702, which is not limited in the embodiment of the present invention.
  • the interface between the first base station 701 and the second base station 702 includes a wired interface and a wireless interface, which are not limited in the embodiment of the present invention.
  • the first base station 701 may send the calculated subframe number and the frame number of the paging frame to which the subframe belongs to the second base station 702 by using notification signaling; where the notification signaling uses bit mapping.
  • the length of the notification information the indication period of the notification signaling (in units of frames) X (nB/T).
  • the second base station 702 may further send configuration information of the approximate null subframe to the first base station 701.
  • the second base station 701 may send the configuration information of the approximate null subframe to the first base station 701 by using the notification signaling; wherein the notification signaling may be merged into the notification signaling for protecting the data transmission or the broadcast signal transmission. , or sent separately.
  • the first base station 701 and the second base station 702 are base stations located in a heterogeneous network, and therefore the coverage of the first base station 701 and the coverage of the second base station 702 are intersected, and the first base station 701 is configured.
  • the spectrum resources are completely or partially identical to the spectrum resources configured by the second base station 702.
  • the UE in the connected state determined by the first base station 701 may specifically be a UE that is in a connected state and whose SIR is less than or equal to a preset threshold.
  • the structure of the first base station 701 is the same as that of FIG. 5 or FIG. 6, which is not described in this embodiment.
  • the first base station 701 calculates the subframe number of the subframe required for paging the UEs and the frame number of the paging frame to which the subframe belongs, and The calculated subframe number and the frame number of the paging frame are sent to the second base station 702, so that the second base station 702 can configure the subframe corresponding to the subframe number in the paging frame corresponding to the frame number to be an approximate null subframe. , or stop paging interference of the second base station 702 to the UE in the connected state in the first base station 701.
  • the embodiment of the present invention only protects paging information of the UE in the connected state in the first base station 701, and does not need to protect paging information of all UEs in the first base station 701; accordingly, the second base station 702 can use the first base station 701.
  • the subframes in the paging frame corresponding to the UE in the connected state are configured to be approximately empty subframes, and the subframes in the paging frames corresponding to all the UEs in the first base station 701 need not be configured to be approximately null subframes;
  • the embodiment of the invention can avoid paging interference to the UE in the connected state in the heterogeneous network, and reduce the waste of resources of the interfering cell.
  • the specific manner of implementing the paging resource coordination in the heterogeneous network by using the base station and the system embodiment provided by the present invention is similar to the foregoing method embodiment of the present invention, and details are not described herein again.
  • the foregoing storage medium includes: a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like can store program codes. Medium.

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Description

一种异构网络中寻呼资源协调方法及基站、 系统 本申请要求于 2010年 1 1月 10 日提交中国专利局、 申请号为
201010538735.1、发明名称为 "一种异构网络中寻呼资源协调方法及基站、 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
本发明涉及通讯技术领域, 尤其涉及一种异构网络中寻呼资源协调方法及 基站、 系统。
背景技术
在长期演进 ( Long term evolution , LTE ) 无线通信系统中, 同一网络小区 内可以同时部署宏基站和低功率基站,这种网络被称为异构网络( Heterogeneous Network, HN ) 。 其中, 低功率基站可以包括但不限于微基站、 微微基站以及 中继站。 低功率基站可以用于覆盖小区的热点区域、 室内、 盲点区域或小区边 缘, 可以提升小区平均吞吐量、 小区边缘吞吐量等。 在异构网络中, 为了尽可 能地提高系统的频谱利用效率, 通常宏基站和低功率基站会配置相同的频谱资 源, 导致了宏基站和低功率基站之间会产生相互干扰。 如图 1所示,宏基站(干 扰基站) 会对低功率基站 (目标基站) 服务的用户终端 ( User equipment, UE ) 产生寻呼干扰; 同样, 低功率基站 (干扰基站) 也会对宏基站 (目标基站) 服 务的 UE产生寻呼干扰。
因此, 消除干扰基站对目标基站服务的 UE产生的寻呼干扰就成为异构网 络中亟待解决的问题。
发明内容
本发明实施例中提供了一种异构网络中寻呼资源协调方法及基站, 可以避 免对异构网络中处于连接态的 UE的寻呼干扰, 降低干扰小区的资源浪费。
本发明一方面提供一种异构网络中寻呼资源协调方法, 包括: 第一基站确 定处于连接态的用户终端; 该第一基站计算用于发送寻呼信息的子帧的子帧号 以及该子帧所属的寻呼帧的帧号, 上述寻呼信息用于寻呼上述处于连接态的用 户终端; 上述第一基站向第二基站发送计算出的上述子帧号以及上述寻呼帧的 成近似空子帧, 或使该第二基站停止在上述帧号对应的寻呼帧中的上述子帧号 对应的子帧中发送信息。 本发明另一方面提供一种基站, 该基站与第二基站都位于异构网络中, 该 基站包括: 确定单元, 用于确定处于连接态的用户终端; 计算单元, 用于计算 用于发送寻呼信息的子帧的子帧号以及该子帧所属的寻呼帧的帧号, 上述寻呼 信息用于寻呼上述确定单元确定出的处于连接态的用户终端; 和发送单元, 用 于向上述第二基站发送上述计算单元计算出的上述子帧号以及上述寻呼帧的帧 成近似空子帧, 或使上述第二基站停止在上述帧号对应的寻呼帧中的上述子帧 号对应的子帧中发送信息。 本发明再一方面还提供一种异构网络中寻呼资源的协调系统包括上述的基 站作为第一基站, 还包括第二基站, 用于接收上述第一基站发送的上述子帧号
子帧中发送信息。
本发明实施例中, 第一基站在确定出处于连接态的用户终端之后, 计算出 寻呼这些用户终端所需的子帧的子帧号以及该子帧所属的寻呼帧的帧号, 并将 计算出的子帧号以及寻呼帧的帧号发送给第二基站, 使得第二基站可以将上述 帧号对应的寻呼帧中的上述子帧号对应的子帧配置成近似空子帧, 或停止在上 站对第一基站中处于连接态的用户终端的寻呼干扰。 本发明实施例提供的上述 技术方案, 能够消除第二基站对第一基站中连接态用户终端的寻呼干扰, 避免 第一基站中处于连接态的用户终端的寻呼信息受第二基站的干扰。 同时, 由于 该技术方案是对处于连接态的用户终端进行寻呼资源协调, 而不对通常受寻呼 干扰较小的空闲态用户终端进行寻呼资源协调, 因此避免了针对连接态和空闲 态所有用户终端都进行寻呼资源协调带来的资源浪费。
附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案, 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的 前提下, 还可以根据这些附图获得其他的附图。
图 1为现有技术中宏基站与低功率基站之间的寻呼干扰的场景示意图; 图 2为本发明实施例中提供的一种异构网络中寻呼资源协调方法的流程示 意图;
图 3为本发明实施例中提供的一种宏基站与微微基站之间的寻呼干扰的场 景示意图;
图 4为本发明实施例中提供的另一种宏基站与微微基站之间的寻呼干扰的 场景示意图;
图 5为本发明实施例中提供的一种基站的结构示意图;
图 6为本发明实施例中提供的另一种基站的结构示意图;
图 7本发明实施例中提供的一种异构网络中寻呼资源协调系统的结构示意 图。
具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进 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。
请参阅图 2 , 图 2为本发明实施例中提供的一种异构网络中寻呼干扰 的消除方法的流程示意图。 其中, 该方法可以包括以下步骤。
201、 第一基站确定处于连接态的 UE。
其中, 第一基站可以是宏基站, 也可以是微基站、 微微基站以及中继站等 低功率基站, 本发明实施例不做限定。
对于第一基站而言, 其覆盖范围内的 UE处于空闲态或连接态。 其中, 处 于空闲态的 UE的主要工作是监测第一基站发送的广播信息、 控制信息以及寻 呼信息等, 而处于连接态的 UE的主要工作是与第一基站之间交互数据信息、 业务信息等。 因此, 对于第一基站来说, 通过监测 UE的工作状态即可以确定 UE当前处于空闲态或处于连接态。
202、第一基站计算用于发送寻呼信息的子帧的子帧号以及该子帧所属的寻 呼帧的帧号, 其中, 上述寻呼信息用于寻呼上述的处于连接态的 UE。
在现有技术中, 寻呼通过物理下行控制信道 ( Physical downlink control channel, PDCCH ) 和物理下行共享信道 ( Physical downlink sharing channel, PDSCH ) 来实现的。 其中, 在 PDCCH 上使用寻呼无线网络临时标识( Paging- Radio network temporary identifier , P-RNTI )进行加扰; 在 PDSCH上承载寻呼 信息, 对于时分双工 ( Time Division Duplexing, TDD ) 系统, 寻呼信息在每个 无线帧的子帧 0, 1 , 5, 6中的一个或多个子帧上传输,对于频分双工 (Frequency Division Duplexing, FDD ) 系统, 寻呼信息在每个无线帧的子帧 0, 4, 5, 9中 的一个或多个子帧上传输。
在 LTE无线通信系统中, 基站通过子帧以及该子帧所属的寻呼帧来发送寻 呼信息, 例如: 对于时分双工 ( Time Division Duplexing, TDD ) 系统, 寻呼信 息在每个无线帧的子帧 0, 1 , 5, 6中的一个或多个子帧上传输, 对于频分双工 ( Frequency Division Duplexing , FDD ) 系统, 寻呼信息在每个无线帧的子帧 0 , 4, 5 , 9中的一个或多个子帧上传输。 寻呼通过物理下行控制信道 ( Physical downlink control channel, PDCCH ) 和物理下行共享信道 ( Physical downlink sharing channel, PDSCH ) 来实现。 在 PDCCH 上使用寻呼无线网络临时标识 ( Paging- Radio network temporary identifier , P-RNTI ) 进行力口扰, UE使用 P-RNTI监测 PDCCH。 这样, 后续 UE可以使用 P-RNTI对监测到的 PDCCH进 行解扰,并在正确解扰 PDCCH之后读取 PDCCH调度指示的 PDSCH,在 PDSCH 上获得相关数据(包括 UE的等效标识 UE— ID )并通过寻呼信道( Paging Channel , PCH )传到媒体接入控制层, 实现基站对 UE的寻呼。 作为一个可选的实施方式, 第一基站可以根据预先配置的寻呼参数 nB计 算出用于发送寻呼信息的寻呼机会 i— s; 然后再根据寻呼机会 i— s进一步确定出 用于发送寻呼信息的子帧的子帧号。 其中, 第一基站根据预先配置的寻呼参数 nB计算出用于发送寻呼信息的寻呼机会 i— S ,并根据寻呼机会 i— S确定出用于发 送寻呼信息的子帧的子帧号的具体实现方式为:
( 1 )第一基站根据以下公式( 1 )计算出用于发送寻呼信息的寻呼机会 i— s。 i— s = floor ( UE— ID I N ) mod Ns ( 1 )
其中, floor ( * )表示取整, 即表示取 UE— ID / N的商的整数; UE— ID表 示处于连接态的 UE的等效标识; N取 T和第一基站预先配置的寻呼参数 nB之 间的最小值, 其中 T表示处于连接态 UE的实际寻呼周期, ^取 1和 nB/T之间 的最大值, mod表示取模运算。 其中, 第一基站预先配置的寻呼参数 nB的取值 范围可以是 { 4T, 2T, Τ, T/2, T/4, T/8, T/16, T/32 }。 在具体实现过程中, 该 nB可 以由高层信令在目标基站中预先配置; T的取值范围可以是 { 32, 64, 128, 256 } , 单位为帧。
在 LTE无线通信系统中, 每一个 UE均有一个特定寻呼周期 Ts , Ts的取值 范围可以是 { 32, 64, 128, 256 } , 单位为帧; 同时每一个基站也会对覆盖范围的 UE广播非连续接收 (Discontinuous Reception , DRX ) 周期 Te, Te的取值范围 可以是 { 32, 64, 128, 256 } , 单位为帧。 因此, 对于某一个 UE来说, 其实际寻呼 周期 T具体可以取广播 DRX周期 1^和特定寻呼周期 1\之间的最小值。
举例来说, 假如第一基站的广播 DRX周期 Te取值为 32帧, 而第一基站中 某一个处于连接态 UE的特定寻呼周期 Ts取值为 64帧, 则该处于连接态的 UE 的实际寻呼周期 T取 64帧和 32帧中的最小值, 即 T= 32帧。 再举例来说, 假 如第一基站的广播 DRX周期 Te取值为 128帧, 而第一基站中某一个处于连接 态的 UE的特定寻呼周期 Ts取值为 64帧, 则该处于连接态的 UE实际寻呼周期 T取 128帧和 64帧中的最小值, 即 T=64帧。 可见, 第一基站中处于连接态的 UE的实际寻呼周期 T<=TC
作为一个可选的实施方式, 第一基站中某一个处于连接态的 UE的等效标 识 UE— ID具体可以取该 UE的国际移动用户识别码 ( International Mobile
Subscriber Identification Number , IMSI ) mod 1024的值。
( 2 ) 第一基站根据计算出的 i— s从保存的 i— s与子帧号的对应关系中获取 用于发送寻呼信息的子帧的子帧号。 本发明实施例中, 第一基站在计算出用于发送寻呼信息的寻呼机会 i— S之 后,可以从表 1或表 2所示的 i— s与子帧号的对应关系中获取用于发送寻呼信息 的子帧的子帧号。 其中, 表 1对应于 LTE TDD系统, 表 2对应于 LTE FDD系 统。
表 1 i—s与子帧号的对应关系
Figure imgf000008_0001
i—s与子帧号的对应关系
Figure imgf000008_0002
举例来说, 当第一基站的寻呼参数 nB取值为 T时, Ns取 1和 nB/T之间的 最大值, 即 Ns取值 1 , 将 Ns=l代入上述公式 ( 1 ) 后可知, 任何数值模 1的结 果均为 0, 即 i— s=0; 以表 1为例, 根据表 1可以看出, 第一基站用于发送寻呼 信息的子帧具体为子帧 0 (即子帧号为 0 ) 。 当第一基站的寻呼参数 nB取值为 2T时, Ns取 1和 nB/T之间的最大值, 即 Ns取值 2, 将 Ns=2代入上述公式( 1 ) 后可知, 任何数值模 2的结果可能是 0, 也可能是 1 , 即 i— s=0或 1 ; 根据表 1 可以看出, 第一基站用于发送寻呼信息的子帧具体为子帧 0 (即子帧号为 0 )或 子帧 5 (即子帧号为 5 ) 。
作为一个可选的实施例, 第一基站可以根据预先配置的寻呼参数 nB计算 出用于发送寻呼信息的寻呼帧的帧号。在 LTE TDD系统中,每一个寻呼帧包含 10个子帧, 其中, 每一个寻呼帧可以使用子帧 0, 子帧 1 , 子帧 5 , 以及子帧 6 中的一个或多个子帧来发送寻呼信息。 其中, 第一基站根据预先配置的寻呼参 数 nB计算出用于发送寻呼信息的子帧所属的寻呼帧的帧号, 具体为: 第一基站 根据以下公式( 2 )计算出第一基站用于发送寻呼信息的子帧所属的寻呼帧的帧 号 SFN;
SFN mod T= ( Τ / Ν ) x ( UE— ID mod N ) ( 2 )
其中, SFN表示第一基站用于发送寻呼信息的子帧所属的寻呼帧的帧号; T表示第一基站中处于连接态的 UE的实际寻呼周期; UE— ID表示第一基站中 处于连接态的 UE的等效标识; N取 T和寻呼参数 nB之间的最小值。
举例来说, 若第一基站的寻呼参数 nB取值为 Τ, N取 T和 nB之间的最小 值, 即 N=T; 将 N=T代入上述公式( 2 )之后, 上述公式( 2 )变化为公式( 3 ):
SFN mod T =UE— ID mod T ( 3 )
其中, 对于不同的 UE来说, 其等效标识 UE— ID是不同的, 因此公式 ( 3 ) 中的等效标识 UE— ID可以认为是一个变量。 从上述公式 ( 3 ) 可以看出, 第一 基站为了支持对其覆盖范围内的所有的处于连接态的 UE的寻呼, 寻呼帧 SFN 包括资源中的所有寻呼帧, 即第一基站计算出的用于发送寻呼信息的子帧所属 的寻呼帧的集合为所有寻呼帧。
再举例来说, 若第一基站的寻呼参数 nB取值为 T/2 , N取 T和 nB之间的 最小值, 即 N= T/2; 将 N= T/2代入上述公式(2 )之后, 上述公式(2 ) 变化为 公式 ( 4 ) :
SFN mod T =2 X UE— ID mod T/2 ( 4 )
从上述公式(4 )可以看出, 第一基站计算出的用于发送寻呼信息的子帧所 属的寻呼帧的集合为所有偶数帧。
再举例来说, 若 nB取值为 Τ/4 , N取 T和 nB之间的最小值, 即 N= T/4; 将 N= T/4代入上述公式 ( 2 ) 之后, 上述公式 ( 2 ) 变化为公式 ( 5 ) :
SFN mod T =4 X UE— ID mod T/4 ( 5 )
从上述公式(5 )可以看出, 第一基站计算出的用于发送寻呼信息的子帧所 属的寻呼帧的集合为 SFN等于所有 4的整数倍的寻呼帧。
203、 第一基站将计算出的子帧号以及寻呼帧的帧号发送至第二基站, 使第
( almost blank subframe , ABS ) , 或使第二基站停止在上述帧号对应的寻呼帧 中的上述子帧号对应的子帧中发送信息。
本发明实施例中, 近似空子帧 ( ABS ) 对寻呼干扰的影响极小, 可以忽略 不计, 或者说对寻呼干扰的影响在允许的范围之内。 有关近似空子帧的详细介 绍可以参阅第三代合作伙伴计划( The 3rd Generation Partnership Project, 3 GPP ) 标准的相关内容, 本发明实施例不作赘述。 本发明实施例中, 对于第二基站而言, 在接收到第一基站发送的子帧号以 及寻呼帧的帧号之后, 可以将与上述帧号和上述子帧号对应的寻呼帧中的子帧 配置成近似空子帧, 避免对第一基站中处于连接态的用户终端的寻呼干扰。
作为一个可选的实施方式, 第二基站在接收到第一基站发送的子帧号以及 的子帧上发送信息, 避免对第一基站中处于连接态的用户终端的寻呼干扰。
举例来说, 第一基站可以通过与第二基站之间的接口将计算出的子帧号以 及寻呼帧的帧号发送至第二基站, 或者第一基站也可以通过其他专用通道将计 算出的子帧号以及寻呼帧的帧号发送至第二基站, 本发明实施例不做限定。 其 中, 第一基站与第二基站之间的接口包括有线接口和无线接口, 本发明实施例 不做限定。
本发明实施例中, 第一基站可以将计算出的子帧号以及该子帧所属的寻呼 帧的帧号通过通知信令发送至第二基站; 其中, 该通知信令采用比特映射方式, 该通知信息的长度 =该通知信令的指示周期 (单位为帧) X ( nB/T ) 。
本发明实施例中, 第二基站还可以进一步将近似空子帧的配置信息发送至 第一基站。 例如, 第二基站可以通过通知信令将近似空子帧的配置信息发送至 第一基站; 其中, 该通知信令可以被合并到用于保护数据传输或广播信号传输 的通知信令里发送, 或被单独发送。
本发明实施例中, 第一基站和第二基站是位于异构网络中的基站, 因此, 第一基站的覆盖范围与第二基站的覆盖范围有交集, 而且第一基站配置的频谱 资源与第二基站配置的频谱资源完全或部分相同。
其中, 第一基站可以是宏基站, 也可以是微基站、 微微基站以及中继站等 低功率基站, 本发明实施例不做限定。
作为一个可选的实施方式, 上述步骤 201中的第一基站确定处于连接态的 用户终端具体可以通过以下方式来实现: 第一基站确定处于连接态、 并且信干 比 ( Signal to Interference Ratio , SIR ) 小于或等于预设阈值的 UE。
举例来说, 可以在第一基站上预先设置 SIR的预设阈值为 -4dB , 其中, SIR 的预设阈值为 -4dB表示第一基站能够容忍的最大干扰极限; 则第一基站在确定 出的处理连接态的 UE之后, 可以进一步从确定出的处于连接态的 UE中选取 SIR小于或等于 -4dB的 UE, 然后再通过上述的方法计算出寻呼所选取的 UE时 所需的子帧的子帧号以及子帧所属的寻呼帧的帧号, 并发送至第二基站, 使第 帧, 从而可以避免对第一基站中处于连接态、 并且 SIR小于或等于预设阈值的 UE的寻呼干扰。
本发明实施例中, 可以根据第一基站所处的实际场景来预设 SIR的预设阈 值的大小, 不局限于 -4dB , 例如, 还可以是 -5dB、 -6dB等等, 本发明实施例不 做限定。
本发明实施例中, 当第一基站确定的 UE是处于连接态、 并且 SIR小于或 等于预设阈值的 UE时, 则第二基站可以将第一基站中处于连接态、 并且 SIR 小于或等于预设阈值的 UE对应的寻呼帧中的子帧配置成近似空子帧, 而无需 将第一基站中所有的处于连接态的 UE对应的寻呼帧中的子帧配置成近似空子 帧; 从而, 本发明实施例可以避免对异构网络中处于连接态、 并且 SIR小于或 等于预设阈值的 UE的寻呼干扰, 进一步降低干扰小区的资源浪费。
本发明实施例中, 第一基站在确定出处于连接态的 UE之后, 计算出寻呼 这些 UE所需的子帧的子帧号以及该子帧所属的寻呼帧的帧号, 并将计算出的 子帧号以及寻呼帧的帧号发送给第二基站, 使得第二基站可以将上述帧号对应 的寻呼帧中的上述子帧号对应的子帧配置成近似空子帧, 可以避免第二基站对 第一基站中处于连接态的用户终端的寻呼干扰。 本发明实施例仅保护第一基站 中处于连接态的 UE的寻呼信息,而无需保护第一基站中所有的 UE的寻呼信息; 相应地, 第二基站可以将第一基站中处于连接态的 UE对应的寻呼帧中的子帧 配置成近似空子帧, 而无需将第一基站中所有的 UE对应的寻呼帧中的子帧配 置成近似空子帧; 从而, 本发明实施例可以避免对异构网络中处于连接态的 UE 的寻呼干扰, 同时降低干扰小区的资源浪费。
为了更好的理解本发明实施例, 下面通过具体的实施例来进行详细说明。 实施例一:
请参阅图 3 , 图 3为本实施例一提供的一种宏基站和微微基站之间的寻呼 干扰的场景示意图。
如图 3所示, 异构网络内同时存在宏基站和微微基站。 其中, 宏基站确定 其覆盖范围中处于连接态的用户终端为 UE ,而且 UE受到微微基站的寻呼干扰, 即宏基站作为第一基站, 微微基站作为第二基站。
假设宏基站预先配置的寻呼参数 nB=T, UE的实际寻呼周期为 T, UE的等 效标识为 UE— ID, 则宏基站获知 N= T ( N取 T和 nB之间的最小值) , 并将 N= T代入上述的公式 (2 ) , 计算出宏基站用于发送寻呼信息的寻呼帧集合为 所有的寻呼帧; 进一步地, 将 Ns=l ( Ns取 1和 nB/T之间的最大值) 、 N=T代 入公式 ( 1 ) 计算出宏基站的用于发送寻呼信息的寻呼机会 i—s为 0, 以表 1为 例可知, 宏基站的用于发送寻呼信息的子帧为子帧号为 0的子帧。
在计算出用于发送寻呼信息的子帧 0以及子帧 0所属的所有寻呼帧之后, 宏基站可以通过与微微基站之间的接口, 将计算出用于发送寻呼信息的子帧 0 的子帧号以及子帧 0所属的所有寻呼帧的帧号发送给微微基站。
微微基站在接收到宏基站发送的用于发送寻呼信息的子帧 0的子帧号以及 子帧 0所属的所有寻呼帧的帧号之后, 微微基站将所有寻呼帧中的子帧号为 0 的子帧配置成近似空子帧。从而可以避免微微基站对宏基站中处于连接态的 UE 的寻呼干扰。 可选地, 该微微基站可以将近似空子帧的配置信息发送至宏基站。
本发明实施例中, 宏基站在确定出处于连接态的 UE之后, 可以计算出寻 呼这些处于连接态的 UE所需的子帧的子帧号以及该子帧所属的寻呼帧的帧号, 并将计算出的子帧号以及寻呼帧的帧号发送给微微基站, 使得微微基站可以将 上述帧号对应的寻呼帧中的上述子帧号对应的子帧配置成近似空子帧, 可以避 免微微基站对宏基站中处于连接态的 UE的寻呼干扰。 本发明实施例仅保护宏 基站中处于连接态的 UE的寻呼信息,而无需保护宏基站中所有的 UE的寻呼信 息; 相应地, 微微基站可以将宏基站中处于连接态的 UE对应的寻呼帧中的子 帧配置成近似空子帧, 而无需将宏基站中所有的 UE对应的寻呼帧中的子帧配 置成近似空子帧; 从而, 本发明实施例可以避免对异构网络中处于连接态的 UE 的寻呼干扰, 同时降低干扰小区的资源浪费。
实施例二:
请参阅图 4, 图 4为本实施例二提供的一种宏基站和微微基站之间的寻呼 干扰的场景示意图。
如图 4所示, 异构网络内同时存在宏基站和微微基站。 其中, 微微基站中 处于连接态的用户终端为 UE1和 UE2, UE1和 UE2受到宏基站的寻呼干扰, 即微微基站作为第一基站, 宏基站作为第二基站。
假设微微基站预先配置的寻呼参数 nB取值为 2T, UE1和 UE2的实际寻呼 周期 T均为 640ms, UE1和 UE2的等效标识 UE— ID分别为 12和 37 , 则微微基 站获知 N= T ( N取 T和 nB之间的最小值) , 对于 UE1 , 微微基站可以将 N=T 以及 UE— ID=12代入上述的公式( 2 ) , 计算出微微基站的用于发送寻呼信息给 UE1的寻呼帧的帧号为 SFN=12; 进一步地, 将 Ns=2 ( ^取 1和 nB/T之间的 最大值) 、 N=T以及 UE— ID=12代入上述的公式( 1 )计算出微微基站的用于发 送寻呼信息给 UE1的寻呼机会为 0, 以表 1为例可知, 微微基站的用于发送寻 呼信息给 UE 1的子帧为子帧 0; 而对于 UE2 , 4¾啟基站可以将 N=T以及 UE_ID=37代入上述的公式 ( 2 ) , 计算出微微基站的用于发送寻呼信息给 UE2 的寻呼帧为 SFN=37; 进一步地, 将 Ns=2 ( ^取 1和 nB/T之间的最大值) 、 N=T以及 UE— ID=37代入上述的公式( 1 )计算出微微基站的用于发送寻呼信息 给 UE2的寻呼机会为 0,则根据表 1可知,微微基站的用于发送寻呼信息给 UE2 的子帧为子帧 0。
在计算出用于发送寻呼信息给 UE1的子帧 0以及子帧 0所属的寻呼帧 12 之后, 微微基站可以通过与宏基站之间的接口, 将计算出用于发送寻呼信息的 子帧 0的子帧号以及子帧 0所属的寻呼帧 12的帧号发送给宏基站; 同样, 在计 算出用于发送寻呼信息给 UE2的子帧 0以及子帧 0所属的寻呼帧 37之后, 微 微基站可以通过与宏基站之间的接口, 将计算出用于发送寻呼信息的子帧 0的 子帧号以及子帧 0所属的寻呼帧 37的帧号发送给宏基站。
宏基站在接收到微微基站发送的用于发送寻呼信息的子帧 0的子帧号以及 子帧 0所属的寻呼帧 12的帧号和寻呼帧 37的帧号之后,宏基站将寻呼帧 12和 寻呼帧 37中的子帧 0配置成近似空子帧,从而可以避免宏基站对微微基站中处 于连接态的用户终端的寻呼干扰。
本发明实施例中, 微微基站可以采用 64 X 2 = 128个比特, 对应于 640ms 内的所有的子帧 0和子帧 5, 如果比特为 1 , 则表示微微基站将在该子帧上发送 寻呼信息, 即要求宏基站将该子帧配置成近似空子帧, 避免宏基站对微微基站 中处于连接态的 UE的寻呼干扰。
本发明实施例中, 微微基站在确定出处于连接态的 UE之后, 可以计算出 寻呼这些处于连接态的 U E所需的子帧的子帧号以及该子帧所属的寻呼帧的帧 号, 并将计算出的子帧号以及寻呼帧的帧号发送给宏基站, 使得宏基站可以将 上述帧号对应的寻呼帧中的上述子帧号对应的子帧配置成近似空子帧, 可以避 免宏基站对微微基站中处于连接态的 UE的寻呼干扰。 本发明实施例仅保护微 微基站中处于连接态的 UE的寻呼信息,而无需保护微微基站中所有的 UE的寻 呼信息; 相应地, 宏基站可以将微微基站中处于连接态的 UE对应的寻呼帧中 的子帧配置成近似空子帧, 而无需将微微基站中所有的 UE对应的寻呼帧中的 子帧配置成近似空子帧; 从而, 本发明实施例可以避免对异构网络中处于连接 态的 UE的寻呼干扰, 同时降低干扰小区的资源浪费。
请参阅图 5 , 图 5为本发明实施例中提供的一种基站的结构示意图, 应用 于异构网络, 可以实现上述方法实施例中的步骤。 该基站包括: 确定单元 501 , 计算单元 502和发送单元 503。 其中, 确定单元 501用于确定处于连接态的用 户终端; 计算单元 502用于计算用于发送寻呼信息的子帧的子帧号以及该子帧 所属的寻呼帧的帧号, 其中, 上述的寻呼信息用于寻呼确定单元 501确定出的 UE; 发送单元 503用于将计算单元 502计算出的子帧号以及寻呼帧的帧号发 帧配置成近似空子帧, 或使第二基站停止在上述帧号对应的寻呼帧中的上述子 帧号对应的子帧中发送信息。
作为一个可选的实施方式,确定单元 501进一步可以用于确定处于连接态、 并且 SIR小于或等于预设阈值的 UE。
本发明实施例中, 发送单元 503具体可以用于将计算单元 502计算出的子 帧号以及寻呼帧的帧号通过通知信令发送至第二基站; 其中, 该通知信令采用 比特映射方式, 该通知信息的长度 =该通知信令的指示周期 X ( nB/T ) 。
本发明实施例中, 第二基站还可以进一步将近似空子帧的配置信息发送至 本基站。 例如, 第二基站可以通过通知信令将近似空子帧的配置发送至本站; 其中, 其中, 该通知信令可以被合并到用于保护数据传输或广播信号传输的通 知信令里发送, 或被单独发送。
其中, 本发明实施例提供的基站和第二基站是位于异构网络中的基站, 因 此, 本发明实施例提供的基站的覆盖范围与第二基站的覆盖范围有交集, 而且 本发明实施例提供的基站所配置的频谱资源与第二基站配置的频谱资源完全或 部分相同。
请参阅图 6, 图 6本发明实施例提供的另一基站的结构示意图, 应用于异 构网络。 其中, 图 6所示的基站是由图 5所示的基站进行细化得到的。 其中, 计算单元 502可以包括:
第一子单元 5021 , 用于根据公式 i—s = floor ( UE— ID / N ) mod Ns计算用于 发送寻呼信息的寻呼机会 i—S ;
第二子单元 5022, 用于根据第一子单元 5021计算出的 i—s从保存的 i—s与 子帧号的对应关系中获取用于发送寻呼信息的子帧的子帧号; 和
第三子单元 5023 , 用于根据公式 SFN mod T= ( T / N ) χ ( UE_ID mod N ) 计算用于发送寻呼信息的子帧所属的寻呼帧的帧号 SFN。
其中, 上述 floor ( * )表示取整运算, UE— ID表示用户终端的等效标识,
N取用户终端的实际寻呼周期 T和预先设置的寻呼参数 nB之间的最小值, Ns 取 1和 nB/T之间的最大值, mod表示取模运算, nB的取值范围为 { 4T, 2T, Τ, T/2, T/4, T/8, T/16, T/32 }。
本发明实施例中, 确定单元 501在确定出处于连接态的 UE之后, 计算单 元 502计算出寻呼这些 U E所需的子帧的子帧号以及该子帧所属的寻呼帧的帧 号, 并由发送单元 503将计算单元 502计算出的子帧号以及寻呼帧的帧号发送 应的子帧配置成近似空子帧, 或停止在上述帧号对应的寻呼帧中的上述子帧号 对应的子帧中发送信息, 可以避免第二基站对本基站中处于连接态的 UE的寻 呼干扰。 本发明实施例仅保护本基站中处于连接态的 UE的寻呼信息, 而无需 保护本基站中所有的 UE的寻呼信息; 相应地, 第二基站可以将本基站中处于 连接态的 UE对应的寻呼帧中的子帧配置成近似空子帧, 而无需将本基站中所 有的 UE对应的寻呼帧中的子帧配置成近似空子帧; 从而, 本发明实施例可以 避免对异构网络中处于连接态的 UE的寻呼干扰, 同时降低干扰小区的资源浪 费。
请参阅图 7 , 图 7为本发明实施例中提供的一种异构网络中寻呼资源协调 系统的结构示意图。 其中, 该系统可以包括: 第一基站 701和第二基站 702。 上述第一基站 701可以是宏基站, 也可以是微基站、 微微基站以及中继站 等低功率基站, 本发明实施例不做限定; 上述第二基站 702可以是宏基站, 也 可以是微基站、 微微基站以及中继站等低功率基站, 本发明实施例不做限定。
其中, 上述第一基站 701用于确定处于连接态的 UE, 并计算用于发送寻呼 信息的子帧的子帧号以及该子帧所属的寻呼帧的帧号, 其中, 上述的寻呼信息 用于寻呼第一基站 701中处于连接态的 UE;第一基站 701将计算出的子帧号以 及寻呼帧的帧号发送至第二基站 702。上述第二基站 702用于接收第一基站 701 发送的子帧号以及寻呼帧的帧号, 将上述帧号对应的寻呼帧中的上述子帧号对 应的子帧配置成近似空子帧, 或停止在上述帧号对应的寻呼帧中的上述子帧号 对应的子帧中发送信息。
举例来说, 第一基站 701可以通过与第二基站 702之间的接口将计算出的 子帧号以及寻呼帧的帧号发送至第二基站 702, 或者第一基站 701也可以通过 其他专用通道将计算出的子帧号以及寻呼帧的帧号发送至第二基站 702, 本发 明实施例不做限定。 其中, 第一基站 701与第二基站 702之间的接口包括有线 接口和无线接口, 本发明实施例不做限定。
本发明实施例中, 第一基站 701可以将计算出的子帧号以及该子帧所属的 寻呼帧的帧号通过通知信令发送至第二基站 702; 其中, 该通知信令采用比特 映射方式, 该通知信息的长度 =该通知信令的指示周期(单位为帧) X ( nB/T ) 。
本发明实施例中, 第二基站 702还可以进一步将近似空子帧的配置信息发 送至第一基站 701。 例如, 第二基站 701可以通过通知信令将近似空子帧的配 置信息发送至第一基站 701 ; 其中, 该通知信令可以被合并到用于保护数据传 输或广播信号传输的通知信令里发送, 或被单独发送。 本发明实施例中,第一基站 701和第二基站 702是位于异构网络中的基站, 因此第一基站 701的覆盖范围与第二基站 702的覆盖范围有交集, 而且第一基 站 701配置的频谱资源与第二基站 702配置的频谱资源完全或部分相同。 作为一个可选的实施方式, 第一基站 701确定出的处于连接态的 UE具体 可以是处于连接态、 并且 SIR小于或等于预设阈值的 UE。 本发明实施例中, 第一基站 701的结构与图 5或图 6相同, 本实施例不作 复述。 本发明实施例中, 第一基站 701在确定出处于连接态的 UE之后, 计算出 寻呼这些 UE所需的子帧的子帧号以及该子帧所属的寻呼帧的帧号, 并将计算 出的子帧号以及寻呼帧的帧号发送给第二基站 702, 使得第二基站 702可以将 上述帧号对应的寻呼帧中的上述子帧号对应的子帧配置成近似空子帧, 或停止 二基站 702对第一基站 701中处于连接态的 UE的寻呼干扰。 本发明实施例仅 保护第一基站 701中处于连接态的 UE的寻呼信息, 而无需保护第一基站 701 中所有的 UE的寻呼信息; 相应地, 第二基站 702可以将第一基站 701中处于 连接态的 UE对应的寻呼帧中的子帧配置成近似空子帧,而无需将第一基站 701 中所有的 UE对应的寻呼帧中的子帧配置成近似空子帧; 从而, 本发明实施例 可以避免对异构网络中处于连接态的 UE的寻呼干扰, 同时降低干扰小区的资 源浪费。 此外, 应用本发明提供的基站、 系统实施例实现异构网络中寻呼资源 协调的具体方式与本发明前述方法实施例类似, 此处不再赘述。
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: 只读存储器( Read-Only Memory, ROM ) 、 随机 存取器 (Random Access Memory , RAM ) 、 磁碟或者光盘等各种可以存 储程序代码的介质。
以上对本发明实施例中提供的一种异构网络中寻呼资源协调方法及 施方式进行了阐述, 以上实施例的说明只是用于帮助理解本发明的方法及 其核心思想; 同时, 对于本领域的一般技术人员, 依据本发明的思想, 在 具体实施方式及应用范围上均会有改变之处, 综上所述, 本说明书内容不 应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种异构网络中寻呼资源协调方法, 其特征在于, 包括: 第一基站确定处于连接态的用户终端;
所述第一基站计算用于发送寻呼信息的子帧的子帧号以及所述子帧所属的 寻呼帧的帧号, 所述寻呼信息用于寻呼所述处于连接态的用户终端;
所述第一基站向第二基站发送计算出的所述子帧号以及所述寻呼帧的帧 号, 使所述第二基站将所述帧号对应的寻呼帧中的所述子帧号对应的子帧配置 成近似空子帧, 或使所述第二基站停止在所述帧号对应的寻呼帧中的所述子帧 号对应的子帧中发送信息。
2、 根据权利要求 1所述的方法, 其特征在于, 所述第一基站确定处于连接 态的用户终端包括:
所述第一基站确定处于连接态、 并且信干比小于或等于预设阈值的用户终 端。
3、 根据权利要求 1所述的方法, 其特征在于, 所述第一基站计算用于发送 寻呼信息的子帧的子帧号以及所述子帧所属的寻呼帧的帧号包括:
所述第一基站根据公式 i— s = floor ( UE— ID I N ) mod Ns计算用于发送寻呼 信息的寻呼机会 i— s , 并根据计算出的 i— s从保存的 i—s与子帧号的对应关系中 获取用于发送寻呼信息的子帧的子帧号;
所述第一基站根据公式 SFN mod T= ( Τ / Ν ) χ ( UE— ID mod N ) 计算用 于发送寻呼信息的子帧所属的寻呼帧的帧号 SFN;
其中, 所述 floor ( * )表示取整运算, 所述 UE— ID表示所述用户终端的 等效标识,所述 N取所述用户终端的实际寻呼周期 T和预先设置的寻呼参数 nB 之间的最小值, Ns取 1和 nB/T之间的最大值, mod表示取模运算, 所述 nB的 取值范围为 { 4T, 2T, Τ, T/2, T/4, T/8, T/16, T/32 }。
4、 根据权利要求 1所述的方法, 其特征在于, 所述第一基站向第二基站发 送计算出的所述子帧号以及所述寻呼帧的帧号, 包括:
所述第一基站将计算出的所述子帧号以及所述寻呼帧的帧号通过比特映射 方式的通知信令发送至第二基站; 所述通知信息的长度为所述通知信令的指示 周期与 (nB/T ) 的乘积, 所述 nB为预先设置的寻呼参数, 所述 T为所述用户 终端的实际寻呼周期, 所述 nB的取值范围为 { 4T, 2T, T, T/2, T/4, T/8, T/16, T/32 }。
5、 根据权利要求 1 ~4任意一项所述的方法, 其特征在于, 还包括: 所述第二基站通过通知信令向所述第一基站发送所述近似空子帧的配置信 息; 所述通知信令被合并到用于保护数据传输或广播信号传输的通知信令里发 送, 或被单独发送。
6、 根据权利要求 1~4任意一项所述的方法, 其特征在于, 所述第一基站的 覆盖范围与所述第二基站的覆盖范围有交集, 所述第一基站配置的频谱资源与 所述第二基站配置的频谱资源完全或部分相同。
7、 一种基站, 所述基站与第二基站都位于异构网络中, 其特征在于, 所述基站包括:
确定单元, 用于确定处于连接态的用户终端;
计算单元, 用于计算用于发送寻呼信息的子帧的子帧号以及所述子帧所属 的寻呼帧的帧号, 所述寻呼信息用于寻呼所述确定单元确定出的处于连接态的 用户终端; 和
发送单元, 用于向所述第二基站发送所述计算单元计算出的所述子帧号以 及所述寻呼帧的帧号, 使所述第二基站将所述帧号对应的寻呼帧中的所述子帧 号对应的子帧配置成近似空子帧, 或使所述第二基站停止在所述帧号对应的寻 呼帧中的所述子帧号对应的子帧中发送信息。
8、 根据权利要求 7所述的基站, 其特征在于,
所述确定单元, 进一步用于确定处于连接态、 并且信干比小于或等于预设 阈值的用户终端。
9、 根据权利要求 7所述的基站, 其特征在于, 所述计算单元, 包括: 第一子单元, 用于根据公式 i— s = floor ( UE— ID I N ) mod Ns计算用于发送 寻呼信息的寻呼机会 i— s;
第二子单元, 用于根据所述第一子单元计算出的 i— s从保存的 i— s与子帧号 的对应关系中获取用于发送寻呼信息的子帧的子帧号; 和 第三子单元, 用于根据公式 SFN mod T= ( T / N ) x ( UE_ID mod N ) 计 算用于发送寻呼信息的子帧所属的寻呼帧的帧号 SFN;
其中, 所述 floor ( * )表示取整运算, 所述 UE— ID表示所述用户终端的 等效标识,所述 N取所述用户终端的实际寻呼周期 T和预先设置的寻呼参数 nB 之间的最小值, Ns取 1和 nB/T之间的最大值, mod表示取模运算, 所述 nB的 取值范围为 { 4T, 2T, Τ, T/2, T/4, T/8, T/16, T/32 }。
10、 根据权利要求 7所述的基站, 其特征在于,
所述发送单元, 进一步用于将所述计算单元计算出的所述子帧号以及所述 寻呼帧的帧号通过比特映射方式的通知信令发送至第二基站; 所述通知信息的 长度为所述通知信令的指示周期与 (nB/T ) 的乘积, 所述 nB为预先设置的寻 呼参数,所述 T为所述用户终端的实际寻呼周期,所述 nB的取值范围为 { 4T, 2T, T, T/2, T/4, T/8, T/16, T/32 }。
11、 根据权利要求 7~10任意一项所述的基站, 其特征在于, 所述基站的覆 盖范围与所述第二基站的覆盖范围有交集, 而且所述基站配置的频谱资源与所 述第二基站配置的频谱资源完全或部分相同。
12、 一种异构网络中寻呼资源协调系统, 其特征在于, 包括: 如权利要求 7-11任一所述的基站作为第一基站, 还包括第二基站, 用于接收所述第一基站 发送的所述子帧号以及所述寻呼帧的帧号, 并将所述帧号对应的寻呼帧中的所 述子帧号对应的子帧配置成近似空子帧, 或停止在所述帧号对应的寻呼帧中的 所述子帧号对应的子帧中发送信息。
PCT/CN2012/070179 2010-11-10 2012-01-10 一种异构网络中寻呼资源协调方法及基站、系统 WO2012062225A2 (zh)

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