WO2012068938A1 - 一种使用tvws传输mbms的方法和装置 - Google Patents

一种使用tvws传输mbms的方法和装置 Download PDF

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Publication number
WO2012068938A1
WO2012068938A1 PCT/CN2011/081195 CN2011081195W WO2012068938A1 WO 2012068938 A1 WO2012068938 A1 WO 2012068938A1 CN 2011081195 W CN2011081195 W CN 2011081195W WO 2012068938 A1 WO2012068938 A1 WO 2012068938A1
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Prior art keywords
mbms
tvws
path loss
base station
idle
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PCT/CN2011/081195
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English (en)
French (fr)
Inventor
李岩
李峰
赵楠
刘星
周栋
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中兴通讯股份有限公司
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Publication of WO2012068938A1 publication Critical patent/WO2012068938A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/30Resource management for broadcast services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14Spectrum sharing arrangements between different networks

Definitions

  • the present invention relates to the field of wireless communications, and more particularly to a method and apparatus for transmitting multicast multicast services (MBMS) using television white space (TVWS).
  • MBMS multicast multicast services
  • TVWS television white space
  • LTE Long Term Evolution
  • MBMS Multimedia Broadcast Multicast Service
  • the startup threshold is more demanding, if the network queries 100 eNBs, but if there is insufficient resources of one eNB, the MBMS cannot be transmitted;
  • the eNB cannot flexibly choose to join or quit according to the MBMS service, the unicast service, and the resource. That is, once an eNB joins the MBMS transmission, it can only exit when the MBMS service ends. In the transmission process, even if the eNB has insufficient resources. , will not quit MBMS transmission.
  • the startup threshold is more severe, the opening of the MBMS transmission is difficult, and the user's experience of the MBMS service is reduced.
  • the eNB cannot flexibly join and quit the MBMS transmission, when the unicast service user has more users, the MBMS service resource cannot be released. Therefore, the unicast service of the eNB cannot be carried out, and the experience for the unicast service is degraded.
  • the main object of the present invention is to provide an MBMS transmission using TVWS.
  • the method and the device are used to solve the problem that the MBMS transmission is difficult to be opened due to the strict starting threshold, and the unicast service cannot be carried out due to the inability of the MBMS service to be released.
  • a method for transmitting MBMS using TVWS comprising: calculating, in a base station having the same idle TVWS, a variety of base station combinations on the idle TVWS with respect to transmitting a path loss gain of the MBMS on the licensed spectrum; the calculation can satisfy the MBMS transmission The required path loss gain, and selecting the corresponding base station combination to transmit the MBMS on the idle TVWS.
  • Calculating the path loss gain includes: calculating a maximum path loss of the MBMS sent by the calculated base station to the licensed spectrum in the coverage area, and subtracting the calculated maximum path loss of the MBMS sent by the base station on the TVWS, The path loss gain is obtained.
  • the method further comprises determining a propagation model used between the two of the base stations having the same idle TVWS on the idle TVWS.
  • Transmitting, by the base station, the maximum path loss of the MBMS on the TVWS including: calculating a maximum path loss of the MBMS sent by the base station to the TVWS in the coverage area; and/or calculating the base station according to the propagation model
  • the maximum path loss of the MBMS is transmitted on the TVWS.
  • Calculating the path loss gain that can meet the MBMS transmission requirement specifically: calculating a combined gain of the base station transmitting the MBMS on the licensed spectrum; when the path loss gain is greater than or equal to the combined gain, the path loss gain satisfies the MBMS transmission requirement .
  • the method further includes: calculating, by each base station, a set of the path loss gains; and a set of the path loss gains including N corresponding to the N base stations Road loss gain.
  • the method further includes: generating a reconfiguration policy of the TVWS and the MBMS, and transmitting the signal to the base station having the same idle TVWS.
  • a device for transmitting MBMS using TVWS comprising:
  • a first calculating unit configured to calculate, in a base station having the same idle TVWS, a path loss gain of the various base station combinations on the idle TVWS relative to transmitting the MBMS on the licensed spectrum;
  • a second calculating unit configured to calculate a path loss gain capable of satisfying an MBMS transmission requirement
  • a reconfiguration unit configured to select the base station combination corresponding to the path loss gain satisfying the MBMS transmission requirement to transmit the MBMS on the idle TVWS.
  • the base station combination includes one or more base stations.
  • the first calculating unit is further configured to: send the calculated maximum path loss of the MBMS on the licensed spectrum to the calculated spectrum from the base station to the coverage area, and subtract the calculated maximum path loss of the MBMS sent by the calculated base station on the TVWS. The path loss gain is obtained.
  • the first calculating unit is further configured to determine a propagation model used by the two base stations having the same idle TVWS on the idle TVWS; the base station calculated by the first calculating unit is on the TVWS Transmitting the maximum path loss of the MBMS, including: calculating the maximum path loss of the MBMS transmitted on the TVWS within the coverage of the base station to the self-coverage; and/or transmitting the MBMS on the TVWS between the base stations calculated according to the propagation model The maximum path loss.
  • the second calculating unit is further configured to calculate a combined gain of the MBMS sent by the base station on the licensed spectrum; when the path loss gain is greater than or equal to the combined gain, determine that the path loss gain satisfies the MBMS transmission requirement.
  • the reconfiguration unit is further configured to generate a reconfiguration policy of the TVWS and the MBMS after the base station combination is selected to send the MBMS on the idle TVWS, and send the reconfiguration policy to the base station having the same idle TVWS.
  • the present invention uses the TVWS transmission MBMS scheme to determine that the path loss gain can be satisfied by calculating the path loss gain of the base station on the idle TVWS relative to the transmission of the MBMS on the licensed spectrum.
  • the MBMS transmits the demand, and selects the corresponding base station to transmit the MBMS on the idle TVWS, it solves the problem that the start threshold is relatively harsh; at the same time, the function of transmitting the MBMS on the licensed spectrum by other base stations in the area is turned off, so that the base stations can be opened.
  • Authorized spectrum exhibition other services, such as unicast services solve the problem that unicast services cannot be carried out due to the inability to release resources occupied by MBMS services.
  • FIG. 1 is a schematic flow chart of a method for transmitting MBMS using TVWS according to the present invention
  • FIG. 2 is a schematic structural diagram of an apparatus for transmitting MBMS using TVWS according to the present invention. detailed description
  • the method for transmitting MBMS using TVWS of the present invention is as shown in FIG. 1, and includes:
  • Step 101 Calculate a path loss gain of the various base station combinations on the idle TVWS relative to the MBMS transmitted on the licensed spectrum in the base station having the same idle TVWS.
  • the base station combination includes one or more base stations.
  • the invention calculates the path loss gain, and specifically includes:
  • the base station sends the maximum path loss of the MBMS on the idle TVWS, including the following situations: The maximum path loss of the MBMS transmitted by the base station to the idle TVWS within the coverage of the base station; and/or the maximum path loss of the MBMS transmitted on the idle TVWS between the base stations calculated according to the propagation model.
  • N N greater than 1
  • a set of path loss gains can be obtained by calculation for each base station combination; a set of path loss gains includes N paths corresponding to N base stations Loss gain.
  • path loss gain set Multiple sets of path loss gain components can be referred to as a path loss gain set.
  • Step 102 Calculate a path loss gain that satisfies the MBMS transmission requirement, and select a corresponding base station combination to send the MBMS on the idle TVWS.
  • the path loss gain When the path loss gain is greater than or equal to the combined gain, the path loss gain satisfies the MBMS transmission requirement. Further, for a set of path loss gains, when the N path loss gains are respectively greater than or equal to the corresponding N combined gains, It is determined that the set of path loss gains meets the MBMS transmission requirement, and the corresponding base station combination is selected to transmit the MBMS on the idle TVWS.
  • the present invention may also generate a reconfiguration policy of the MBMS and the TVWS according to the selected base station that transmits the MBMS on the idle TVWS and the base station that transmits the MBMS on the licensed spectrum, and notify all the same idle TVWS. Base station.
  • MBMS and TVWS reconfiguration strategies can include:
  • Embodiment 1 Re-open the time when the base station transmits MBMS on the licensed spectrum.
  • TVWS transmits, and eNB1, eNB2, and eNB3 have the same idle TVWS (TVWS1).
  • Step 201 Determine a propagation model used by the eNB1, the eNB2, and the eNB3 on the TVWS1.
  • the implementation of the determination of the propagation model is prior art and will not be described here.
  • Step 202 Under the Hata model, respectively calculate the path loss gains of the various base station combinations on the TVWS 1 relative to the MBMS transmitted on the licensed spectrum (for ease of description, referred to as path loss gain).
  • eNB1 , eNB 2 , eNB 3 there are seven types of base station combinations: ⁇ eNB1 , eNB 2 , eNB 3 , ( eNB1 , eNB 2 ), ( eNB 2 , eNB 3 ), ( eNB1 , eNB 3 ), ( eNB1 , eNB 2 , eNB 3 ) ⁇ .
  • the source base station and the destination base station may be two different base stations, or may be the same base station.
  • the maximum path loss for transmitting MBMS on TVWS1 within the coverage of eNB1 to eNB2 is P12.
  • the maximum path loss for transmitting MBMS on TVWS 1 within the coverage of eNB2 to eNB1 is the maximum path loss of MBMS transmitted on TVWS 1 within the coverage of P21 eNB 1 to eNB3.
  • the maximum path loss for transmitting MBMS on TVWS 1 within the coverage of P13 eNB3 to eNB 1 is P31.
  • the maximum path loss for transmitting MBMS on TVWS1 within the coverage of eNB2 to eNB3 is P23.
  • the maximum path loss of eNB 1 , eNB 2 , and eNB 3 to transmit MBMS on TVWS 1 in their respective coverage areas is PI, P2, and P3, respectively.
  • the base station calculates the maximum path loss of the MBMS transmitted on TVWS1 in its own range, and has no necessary connection with the above-described Hata model).
  • the maximum path loss of the MBMS transmitted on TVWS1 is P1.
  • the maximum path loss of the MBMS sent by the eNB1 to the licensed spectrum in its own range is S1;
  • the maximum path loss of the MBMS sent by the eNB2 to the licensed spectrum in its own range is S2;
  • the maximum path loss of the MBMS sent by the eNB3 to the licensed spectrum within its own range is S3;
  • the base station is combined in the following seven cases: ⁇ eNB1 , eNB 2 , eNB 3 , ( eNB1 , eNB 2 ), ( eNB 2 , eNB 3 ), ( eNB1 , eNB 3 ), ( eNB1 , eNB 2 , eNB 3 ) ⁇ 0 each
  • the path loss gain corresponding to the base station combination is shown in Table 1:
  • each base station combination corresponds to a set of path loss gains (including 3 path loss gains); the above 7 sets of path loss gains are combined into one path loss gain set.
  • the corresponding path loss gain is SI-PL.
  • Step 203 Determine a set of path loss increases that can satisfy the MBMS transmission requirement by the path loss gain concentration. Benefit, specifically:
  • eNB1 one user that is farthest from eNB2 and eNB3 is selected within the coverage of eNB1.
  • eNB1, eNB2, and eNB3 are simultaneously transmitting MBMS on the licensed spectrum, the user receives the power W1 of the MBMS.
  • the combined gain (M) of each of eNB1, eNB2, and eNB3 transmitting MBMS on the licensed spectrum is as shown in Table 2:
  • the combining gain is w1 (the user is the user who is farthest from eNB1 in the coverage of eNB1;).
  • the MBMSo is transmitted using the base station combination corresponding to the set of path loss gains.
  • the eNB1 transmits the MBMS on the TVWS1; at the same time, the function of transmitting the MBMS on the licensed spectrum by the eNB2 and the eNB3 can be turned off.
  • the reconfiguration policy of the MBMS and the TVWS is generated based on the selected base station combination for transmitting the MBMS on the TVWS, and is notified to the base station by the reconfiguration module on the network side.
  • the reconfiguration module on the network side notifies eNB1, eNB2, and eNB3 of the reconfiguration policy of MBMS and TVWS, as follows:
  • the time when the eNB1, eNB2, and eNB3 transmit the MBMS on the licensed spectrum is re-enabled.
  • the above various time points are determined according to the idle time period of the idle TVWS (TVWS1 in this embodiment), for example, the idle time period of TVWS1 is tl to t2,
  • the time for the eNB2 and the eNB3 to transmit the MBMS on the licensed spectrum may be tl; and the time for the eNB1 to transmit the MBMS on the TVWS1 may be tl;
  • the time when the eNB 1 transmits the MBMS on the TVWS may be t2;
  • the time for the eNB1, eNB2, and eNB3 to transmit the MBMS on the licensed spectrum may be t2.
  • eNB1, eNB2, and eNB3 notify the users of the respective services of the above-mentioned MBMS and TVWS reconfiguration policies.
  • Step 301 Determine a transmission between the two of the eNB1, the eNB2, and the eNB3 on the TVWS1. Broadcast model. It is assumed that the transmission model between eNB1 and eNB2 on TVWS1 is Hata; the transmission model between eNB1 and eNB3 on TVWS1 is Okumura; the transmission model between eNB2 and eNB3 on TVWS1 is the PCS extension of Hata.
  • Step 302 Calculate the path loss gain of various base station combinations on TVWS1 with respect to transmitting MBMS on the licensed spectrum.
  • the path loss of MBMS transmitted on TVWS1 within the coverage of eNB1 to eNB3 is P13; the path loss of MBMS transmitted on TVWS1 within the coverage of eNB3 to eNB1 is P31;
  • the maximum path loss of the MBMS sent by the eNB1 to the licensed spectrum in its own range is S1;
  • the maximum path loss of the MBMS sent by the eNB2 to the licensed spectrum in its own range is S2;
  • the maximum path loss of the MBMS sent by the eNB3 to the licensed spectrum within its own range is S3;
  • Step 303 Determine a set of path loss gains that the path loss gain set can meet the MBMS transmission requirement.
  • the specific implementation is the same as step 203, and details are not described herein again.
  • eNB1 and eNB3 are selected to transmit MBMS
  • the function of transmitting MBMS by eNB2 can also be turned off.
  • the reconfiguration module on the network side notifies the reconfiguration policies of the MBMS and the TVWS to the eNB1, the eNB2, and the eNB3, and the specific contents are as follows:
  • eNB1, eNB2, and eNB3 notify the users of the respective services of the above-mentioned MBMS and TVWS reconfiguration policies.
  • the MBSFN intra-area network composed of eNB1, eNB2, eNB3, eNB4, eNB5, and eNB6 and each user support TVWS transmission.
  • eNB 1 , eNB 2 has the same idle TVWS 1 ;
  • eNB 3 , eNB 4 has the same idle TVWS 2 ;
  • eNB 5 uses idle TVWS 3 ;
  • eNB 6 uses idle TV WS 4 .
  • Step 401 Determine that the propagation model between eNB1 and eNB2 on TVWS1 is Hata; and within the coverage of eNB1 and eNB2, calculate the three base station combinations corresponding to ⁇ eNB1, eNB2, (eNB1, eNB2) ⁇ by using the Hata model calculation. Path loss gain;
  • eNB1 the base station corresponding to a set of path loss gains capable of satisfying the MBMS transmission requirement is combined into eNB1; then, on TVWS1, a new MBSFN is formed, which is composed of eNB1 and eNB2, in which eNB1 transmits MBMS on TVWS1.
  • the reconfiguration module on the network side notifies eNB1 and eNB2 of the reconfiguration policy of MBMS and TVWS.
  • the details are as follows:
  • the time when the eNB1 and the eNB2 transmit the MBMS on the licensed spectrum is re-enabled.
  • eNB1 and eNB2 notify the users of the respective services of the above-mentioned MBMS and TVWS reconfiguration policies.
  • Step 402 determining that the propagation model between eNB3 and eNB4 on TVWS2 is Hata; in the coverage of eNB3 and eNB4, using the Hata model calculation, respectively calculating three base station combinations corresponding to ⁇ eNB3, eNB4, (eNB3, eNB4) ⁇ Path loss gain;
  • eNB3, eNB4 the base station combination corresponding to a set of path loss gains can satisfy the MBMS transmission requirement (eNB3, eNB4); then, on TVWS2, a new MBSFN is formed, which is composed of eNB3, eNB4, in which eNB3, eNB4 transmits MBMS on TVWS2. .
  • the reconfiguration module on the network side notifies eNB3 and eNB4 of the reconfiguration policy of MBMS and TVWS.
  • the details are as follows:
  • the time at which eNB3 and eNB4 transmit MBMS over the licensed spectrum is re-enabled.
  • eNB3 and eNB4 notify the users of the respective services of the above-mentioned MBMS and TVWS reconfiguration policies.
  • Step 403 For eNB5, the propagation model on TVWS3 is Hata; the path loss gain corresponding to eNB5 is calculated, but the MBMS transmission requirement cannot be met, and eNB5 keeps the original MBMS transmission unchanged.
  • Step 404 For eNB6, the propagation model on TVWS4 is Hata; the path loss gain P6 corresponding to eNB6 is calculated, and the MBMS transmission requirement can be satisfied, and then eNB6 transmits MBMS on TVWS4.
  • the reconfiguration module on the network side notifies the eNB6 of the reconfiguration policy of MBMS and TVWS. The details are as follows:
  • the eNB 6 notifies the users of the respective services of the above-mentioned MBMS and TVWS reconfiguration policies.
  • the present invention provides an apparatus for transmitting MBMS using TVWS, as shown in FIG. 2, including:
  • a first calculating unit configured to calculate, in a base station having the same idle TVWS, a path loss gain of the various base station combinations on the idle TVWS relative to transmitting the MBMS on the licensed spectrum;
  • a second calculating unit configured to calculate a path loss gain capable of satisfying an MBMS transmission requirement
  • a reconfiguration unit configured to select the base station combination corresponding to the path loss gain satisfying the MBMS transmission requirement to transmit the MBMS on the idle TVWS.
  • the base station combination includes one or more base stations.
  • the first calculating unit is further configured to: send the calculated maximum path loss of the MBMS on the licensed spectrum to the calculated spectrum from the base station to the coverage area, and subtract the calculated maximum path loss of the MBMS sent by the calculated base station on the TVWS. The path loss gain is obtained.
  • the first calculating unit is further configured to determine a propagation model used between the two base stations having the same idle TVWS on the idle TVWS;
  • the maximum path loss of the MBMS transmitted by the base station calculated by the first calculating unit on the TVWS includes: calculating the maximum path loss of the MBMS sent by the base station to the TVWS in the coverage area; and/or according to the The maximum path loss of the MBMS transmitted on the TVWS between the base stations calculated by the propagation model.
  • the second calculating unit is further configured to calculate a combined gain of the base station transmitting the MBMS on the licensed spectrum. When the path loss gain is greater than or equal to the combined gain, determining that the path loss gain satisfies an MBMS transmission requirement.
  • the reconfiguration unit is further configured to generate a reconfiguration policy of the TVWS and the MBMS after the base station combination is selected to send the MBMS on the idle TVWS, and send the reconfiguration policy to the base station having the same idle TVWS.

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Abstract

本发明公开了一种使用电视空白频谱(TVWS)传输多播组播业务(MBMS)的方法和装置,方法包括:计算具有相同空闲TVWS的基站中,各种基站组合在所述空闲TVWS上相对于在授权频谱上发送MBMS的路损增益;计算能够满足MBMS发送需求的路损增益,并选择对应的基站组合在所述空闲TVWS上发送MBMS。通过本发明,解决了由于MBMS业务占用资源无法释放导致的单播业务无法开展的问题。

Description

一种使用 TVWS传输 MBMS的方法和装置 技术领域
本发明涉及无线通信领域, 特别是指一种使用电视空白频谱( TVWS ) 传输多播组播业务(MBMS ) 的方法和装置。 背景技术
长期演进( LTE, Long Term Evolution )R9版本的多播组播业务( MBMS, Multimedia Broadcast Multicast Service )传输还处于非常简单的阶段。 网络 侧在 MBMS传输之前, 先会询问各增强型基站( eNB , enhanced Node Base station )是否有资源支持 MBMS传输, 如果各个 eNB都有资源, 则启动该 MBMS传输, 直到该 MBMS业务结束。
上述 MBMS传输机制存在以下不足:
1 )启动门限比较苛刻,假如网络询问 100个 eNB,但是如果有 1个 eNB 的资源不足, 则该 MBMS无法传输;
2 ) eNB无法根据 MBMS业务、 单播业务以及资源, 灵活的选择加入 或退出, 即一旦某个 eNB加入 MBMS传输, 则只能在 MBMS业务结束时 退出, 在传输过程中, 即使该 eNB资源不足, 也不会退出 MBMS传输。
由于启动门限比较苛刻,导致 MBMS传输的开启困难,使用户对 MBMS 业务的感受下降; 另外由于 eNB无法灵活的加入、 退出 MBMS传输, 这样 在单播业务用户较多时, 由于 MBMS业务占用资源无法释放,使得 eNB的 单播业务无法开展, 用于对单播服务感受下降。 发明内容
有鉴于此, 本发明的主要目的在于提供一种使用 TVWS 传输 MBMS 的方法和装置, 以解决由于启动门限比较苛刻, 导致 MBMS传输的开启困 难的问题, 以及由于 MBMS业务占用资源无法释放导致的单播业务无法开 展的问题。
一种使用 TVWS传输 MBMS的方法,该方法包括: 计算具有相同空闲 TVWS的基站中, 各种基站组合在所述空闲 TVWS上相对于在授权频谱上 发送 MBMS的路损增益; 计算能够满足 MBMS发送需求的路损增益, 并 选择对应的基站组合在所述空闲 TVWS上发送 MBMS。
计算所述路损增益, 具体包括: 将计算得到的基站到自身覆盖范围内 在所述授权频谱上发送 MBMS 的最大路损, 减去计算得到的基站在所述 TVWS上发送 MBMS的最大路损, 得到所述路损增益。
计算所述路损增益之前,该方法还包括:确定所述具有相同空闲 TVWS 的基站中两两之间在所述空闲 TVWS上使用的传播模型。
所述基站在所述 TVWS上发送 MBMS的最大路损, 包括: 计算得到的 基站到自身覆盖范围内在所述 TVWS上发送 MBMS的最大路损; 和 /或根 据所述传播模型计算得到的基站之间在所述 TVWS上发送 MBMS的最大路 损。
计算能够满足 MBMS发送需求的路损增益, 具体包括: 计算基站在授 权频谱上发送 MBMS的合并增益; 当所述路损增益大于或等于所述合并增 益时, 所述路损增益满足 MBMS发送需求。
所述具有相同空闲 TVWS的基站有 N个时, N大于 1 , 该方法还包括: 每种基站组合计算得到一组所述路损增益; 一组所述路损增益包含对应 N 个基站的 N个路损增益。
当所述 N个路损增益分别大于或等于对应的 N个所述合并增益时, 确 定所述一组路损增益满足 MBMS发送需求, 并选择对应的基站组合在所述 空闲 TVWS上发送 MBMS。 选择基站组合在所述空闲 TVWS上发送 MBMS后,该方法还包括: 生 成 TVWS和 MBMS的重配策略,发送给所述具有相同空闲 TVWS的基站。
一种使用 TVWS传输 MBMS的装置, 该装置包括:
第一计算单元, 计算具有相同空闲 TVWS的基站中, 各种基站组合在 所述空闲 TVWS上相对于在授权频谱上发送 MBMS的路损增益;
第二计算单元, 用于计算能够满足 MBMS传输需求的路损增益; 重配单元, 用于选择所述满足 MBMS传输需求的路损增益对应的基站 组合在所述空闲 TVWS上传输 MBMS。
所述基站组合包括一个或多个基站。
所述第一计算单元, 还用于将计算得到的基站到自身覆盖范围内在所 述授权频谱上发送 MBMS的最大路损, 减去计算得到的基站在所述 TVWS 上发送 MBMS的最大路损, 得到所述路损增益。
所述第一计算单元, 还用于确定所述具有相同空闲 TVWS的基站中两 两之间在所述空闲 TVWS上使用的传播模型; 所述第一计算单元计算得到 的基站在所述 TVWS上发送 MBMS的最大路损, 包括: 计算得到的基站到 自身覆盖范围内在所述 TVWS上发送 MBMS的最大路损; 和 /或根据所述 传播模型计算得到的基站之间在所述 TVWS上发送 MBMS的最大路损。
所述第二计算单元, 还用于计算基站在授权频谱上发送 MBMS的合并 增益; 当所述路损增益大于或等于所述合并增益时, 确定所述路损增益满 足 MBMS发送需求。
所述重配单元, 还用于在选择了基站组合在所述空闲 TVWS 上发送 MBMS后, 生成 TVWS和 MBMS的重配策略, 发送给所述具有相同空闲 TVWS的基站。
本发明使用 TVWS传输 MBMS的方案, 通过对基站在空闲 TVWS上 相对于在授权频谱上传输 MBMS的路损增益计算, 确定路损增益能够满足 MBMS传输需求时, 并选择对应的基站在该空闲 TVWS上传输 MBMS,解 决了由于启动门限比较苛刻; 同时, 将该区域内其他基站在授权频谱上传 输 MBMS的功能关闭, 使这些基站可以通过开授权频谱展其他业务, 例如 单播业务等, 解决了由于 MBMS业务占用资源无法释放导致的单播业务无 法开展的问题。 附图说明
图 1为本发明使用 TVWS传输 MBMS的方法流程示意图;
图 2为本发明使用 TVWS传输 MBMS的装置结构示意图。 具体实施方式
下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 本发明使用 TVWS传输 MBMS的方法如图 1所示, 包括:
步驟 101 , 计算具有相同空闲 TVWS的基站中, 各种基站组合在空闲 TVWS上相对于在授权频谱上发送 MBMS的路损增益。
其中, 所述的基站组合包括一个或多个基站。
根据实际的应用场景, 需要确定具有相同空闲 TVWS的多个基站中两 两之间在该空闲 TVWS上使用的传播模型。对于无相同空闲 TVWS的单个 基站, 无需确定所述传播模型。
本发明计算路损增益, 具体包括:
1、 计算基站在该空闲 TVWS上发送 MBMS的最大路损;
2、 计算基站到自身覆盖范围内在授权频谱上发送 MBMS的最大路损; 将后者减去前者, 就得到了该基站在该空闲 TVWS上相对于在授权频 谱上传输 MBMS的路损增益。
其中,基站在该空闲 TVWS上发送 MBMS的最大路损, 包括如下的情 况: 基站到自身覆盖范围内在该空闲 TVWS上发送 MBMS的最大路损;和 /或根据传播模型计算得到的基站之间在该空闲 TVWS上发送 MBMS的最 大路损。
需要指出的是, 具有相同空闲 TVWS的基站有 N ( N大于 1 )个时: 对于每种基站组合通过计算可以得到一组路损增益; 一组路损增益包含对 应 N个基站的 N个路损增益。
可以将多组路损增益组成称为一个路损增益集。
步驟 102, 计算能够满足 MBMS发送需求的路损增益, 并选择对应的 基站组合在该空闲 TVWS上发送 MBMS。
计算能够满足 MBMS发送需求的路损增益, 具体包括:
1、 计算基站在授权频谱上发送 MBMS的合并增益;
2、 当路损增益大于或等于合并增益时, 路损增益满足 MBMS发送需 求, 进一步地, 对于一组路损增益, 当其中 N个路损增益分别大于或等于 对应的 N个合并增益时, 确定该组路损增益满足 MBMS发送需求, 并选择 对应的基站组合在该空闲 TVWS上发送 MBMS。
需要指出的是, 一个路损增益集中可能存在多组满足 MBMS传输需求 的路损增益; 也可能不存在。
在选择发送 MBMS 的基站后, 还可以选择关闭一部分基站传输 MBMSo
进一步地, 本发明还可以根据上述选取的在该空闲 TVWS 上传输 MBMS的基站, 以及关闭在授权频谱上传输 MBMS的基站, 生成 MBMS 及 TVWS的重配策略, 并通知给具有相同空闲 TVWS的所有基站。
MBMS及 TVWS的重配策略可以包括:
关闭基站在授权频谱上传输 MBMS的时间; 和
开启基站在空闲 TVWS上传输 MBMS的时间; 和 关闭基站在空闲 TVWS上传输 MBMS的时间; 禾
重新开启基站在授权频谱上传输 MBMS的时间。 实施例一
假设 eNBl、 eNB2、 eNB3组成的 MBSFN区域内网络及各用户均支持
TVWS传输, 且 eNBl、 eNB2、 eNB3有相同的空闲 TVWS ( TVWS1 )。
步驟 201 , 确定 eNBl、 eNB2、 eNB3两两之间在 TVWS1上使用的传 播模型。 确定传播模型的实现为现有技术, 此处不再赘述。
假设 eNBl、 eNB2、 eNB3两两之间在 TVWS1上使用的传播模型均为 Hata。
步驟 202, 在 Hata模型下, 分别计算各种基站组合在 TVWS 1上相对 于在授权频谱上发送 MBMS的路损增益(为了便于后续描述, 简称为路损 增益)。
该实施例中,基站组合有 7种: { eNBl , eNB2, eNB3 , ( eNBl , eNB2 ), ( eNB2, eNB3 ), ( eNBl , eNB3 ), ( eNBl , eNB2, eNB3 ) }。
1、在 Hata模型下,计算基站到基站覆盖范围内在 TVWS1上发送 MBMS 的最大路损, 其中, 源基站和目的基站可以是两个不同的基站, 也可以是 同一个基站。
假设在 Hata模型下, 经过计算得到:
eNBl到 eNB2覆盖范围内在 TVWS1上发送 MBMS的最大路损为 P12 eNB2到 eNB 1覆盖范围内在 TVWS 1上发送 MBMS的最大路损为 P21 eNB 1到 eNB3覆盖范围内在 TVWS 1上发送 MBMS的最大路损为 P13 eNB3到 eNB 1覆盖范围内在 TVWS 1上发送 MBMS的最大路损为 P31 eNB2到 eNB3覆盖范围内在 TVWS1上发送 MBMS的最大路损为 P23 eNB3到 eNB2覆盖范围内在 TVWS 1上发送 MBMS的最大路损为 P32 eNB 1 , eNB2 , eNB3到各自覆盖范围内在 TVWS 1上发送 MBMS的最 大路损分别为 PI , P2, P3。 (基站计算到自身范围内在 TVWS1 上发送 MBMS的最大路损时, 与上述的 Hata模型无必然的联系)。
需要指出的是, 当只存在一个基站, 例如 eNBl时, 则在 TVWS1上发 送 MBMS的最大路损即为 Pl。
2、 计算各个基站在授权频谱上发送 MBMS的最大路损。
eNBl到自身范围内在授权频谱上发送 MBMS的最大路损为 S1;
eNB2到自身范围内在授权频谱上发送 MBMS的最大路损为 S2;
eNB3到自身范围内在授权频谱上发送 MBMS的最大路损为 S3;
3、 根据基站组合计算对应的路损增益。
在该实施例中, 基站组合有以下 7 种情况: { eNBl , eNB2, eNB3 , ( eNBl , eNB2 ), ( eNB2, eNB3 ), ( eNBl , eNB3 ), ( eNBl , eNB2, eNB3 ) }0 则每种基站组合对应的路损增益如表 1所示:
Figure imgf000008_0001
表 1
如表 1 所示, 该实施例中, 每种基站组合对应一组路损增益(包含 3 个路损增益); 将上述 7组路损增益组合成为一个路损增益集。
需要指出的是, 当只存在一个基站, 例如 eNBl时, 则对应的路损增益 即为 SI-PL
步驟 203, 确定路损增益集中能够满足 MBMS发送需求的一组路损增 益, 具体为:
1、 计算 eNBl , eNB2, eNB3各自在授权频谱上发送 MBMS的合并增 益( M ), 包括:
以 eNBl为例, 选取 eNBl的覆盖范围内, 距离 eNB2和 eNB3最远的 一个用户, 首先, 计算 eNBl , eNB2, eNB3同时在授权频谱上发送 MBMS 时, 该用户接收 MBMS的功率 W1; 其次, 计算 eNBl在在授权频谱上发 送 MBMS时, 该用户接收 MBMS的功率 wl;
则 Ml=Wl-wl。
对于 eNB2、 eNB3在授权频谱上发送 MBMS的合并增益( M2=W2-w2; M3=W3-w3 ) 的计算同 eNBl , 不再赘述。
eNBl , eNB2, eNB3各自在授权频谱上发送 MBMS的合并增益( M ) 如表 2所示:
Figure imgf000009_0001
表 2
需要指出的是, 当只存在 eNBl 时, 合并增益即为 wl (用户为 eNBl 的覆盖范围内距离 eNBl最远的一个用户;)。
2、 当表 1中某个基站组合对应的一组路损增益分别大于或等于对应的 合并增益时, 确认该组路损增益能够满足 MBMS发送需求。
以表 1中基站组合 eNBl , eNB3为例, 当(S1-P1)+(S1-P31)大于或等于 Ml、 且 (S2-P12)+(S2-P32)大于或等于 M2、 且(S3-P13)+(S3-P3)大于或等于 M3时, 说明该组路损增益满足 MBMS发送需求。
需要指出的是, 可能同时存在多组满足需求的路损增益, 在选择其中 一组时, 可以有多种方式: 例如选择路损增益的值最小的一组路损增益; 也可以选择路损增益的值最大的一组路损增益; 也可以选择对应的基站组 合中基站个数最少的一组路损增益等。 本发明对此不做限定。 根据需要, 确定了能够满足 MBMS发送需求的一组路损增益后, 使用 该组路损增益对应的基站组合来发送 MBMSo
假设选取基站组合为 eNBl ,则 eNBl在 TVWS1上发送 MBMS; 同时, 可以关闭 eNB2、 eNB3在授权频谱上发送 MBMS的功能。
进一步地,基于选择的在 TVWS上传输 MBMS的基站组合生成 MBMS 及 TVWS的重配策略, 并由网络侧的重配模块通知给基站。
在该实施例中 ,网络侧的重配模块将 MBMS及 TVWS的重配策略通知 给 eNBl、 eNB2和 eNB3, 具体内容如下:
关闭 eNB2、 eNB3在授权频谱上传输 MBMS的时间; 和
开启 eNBl在 TVWS1上传输 MBMS的时间; 和
关闭 eNB 1在 TVWS上传输 MBMS的时间; 和
重新开启 eNBl、 eNB2、 eNB3在授权频谱上传输 MBMS的时间。 上述各个时间点根据空闲 TVWS (该实施例为 TVWS1 )的空闲时间段 确定, 例如 TVWS1的空闲时间段为 tl至 t2, 则
关闭 eNB2、 eNB3在授权频谱上传输 MBMS的时间可以为 tl; 和 开启 eNBl在 TVWS1上传输 MBMS的时间可以为 tl; 和
关闭 eNB 1在 TVWS上传输 MBMS的时间可以为 t2; 和
重新开启 eNBl、 eNB2、 eNB3在授权频谱上传输 MBMS的时间可以 为 t2。
然后 , eNBl , eNB2和 eNB3将上述 MBMS及 TVWS的重配策略通知 给各自服务的用户。
方法实施例二
假设 eNBl、 eNB2、 eNB3组成的 MBSFN区域内网络及各用户均支持 TVWS传输, 且 eNBl、 eNB2、 eNB3有相同的空闲 TVWS ( TVWS1 )。
步驟 301 , 确定 eNBl、 eNB2、 eNB3两两之间在 TVWS1上使用的传 播模型。 假设, eNBl , eNB2之间在 TVWSl上的传输模型为 Hata; eNBl , eNB3之间在 TVWSl上的传输模型为 Okumura; eNB2、 eNB3之间在 TVWSl 上的传输模型为 Hata的 PCS扩展。
步驟 302, 计算各种基站组合在 TVWS1 上相对于在授权频谱上发送 MBMS的路损增益。
1、 假设在 Hata模型下, 经过计算得到: eNB 1到 eNB2覆盖范围内在 TVWS1上发送 MBMS的最大路损为 P12; eNB2到 eNBl覆盖范围内在 TVWS1上发送 MBMS的最大路损为 P21;
假设在 Okumura模型下, 经过计算得到: eNBl到 eNB3覆盖范围内在 TVWS1上发送 MBMS的路损为 P13; eNB3到 eNBl覆盖范围内在 TVWSl 上发送 MBMS的路损为 P31;
假设在 Hata的 PCS扩展模型下, 经过计算得到: eNB2到 eNB3覆盖 范围内在 TVWS1上发送 MBMS的路损为 P23; eNB3到 eNB2覆盖范围内 在 TVWS1上发送 MBMS的路损为 P32;
假设计算得到 eNBl , eNB2, eNB3到各自覆盖范围内在 TVWSl上发 送 MBMS 的最大路损分别为 PI , P2, P3。 (基站计算到自身范围内在 TVWS1上发送 MBMS的最大路损时, 与上述的模型无必然的联系)。
2、 计算各个基站在授权频谱上发送 MBMS的路损。
eNBl到自身范围内在授权频谱上发送 MBMS的最大路损为 S1;
eNB2到自身范围内在授权频谱上发送 MBMS的最大路损为 S2;
eNB3到自身范围内在授权频谱上发送 MBMS的最大路损为 S3;
3、 根据基站组合计算对应的路损增益。 具体实现同步驟 202, 此处不 再赘述。
步驟 303, 确定路损增益集中能够满足 MBMS发送需求的一组路损增 益。 具体实现同步驟 203, 此处不再赘述。
假设选取 eNBl和 eNB3发送 MBMS,则还可以关闭 eNB2传输 MBMS 的功能。
进一步地, 网络侧的重配模块将 MBMS及 TVWS的重配策略通知给 eNBl , eNB2和 eNB3, 具体内容如下:
关闭 eNB2在授权频谱上传输 MBMS的时间; 和
开启 eNBl和 eNB3在 TVWS1上传输 MBMS的时间; 和
关闭 eNBl和 eNB3在 TVWS上传输 MBMS的时间; 和
重新开启 eNBl、 eNB2、 eNB3在授权频谱上传输 MBMS的时间。 然后 , eNBl , eNB2和 eNB3将上述 MBMS及 TVWS的重配策略通知 给各自服务的用户。
实施例三
4叚设 eNBl , eNB2, eNB3, eNB4, eNB5, eNB6组成的 MBSFN区域 内网络及各用户均支持 TVWS传输。 eNB 1 , eNB2有相同的空闲 TVWS 1; eNB3 , eNB4有相同的空闲 TVWS2; eNB5使用空闲 TVWS3; eNB6使用 空闲 TVWS4。
步驟 401 , 确定 eNBl , eNB2之间在 TVWS1上的传播模型为 Hata; 在 eNBl , eNB2覆盖范围内, 利用 Hata模型计算, 分别计算 { eNBl , eNB2, ( eNBl , eNB2 ) }这三种基站组合对应的路损增益;
假设能够满足 MBMS 传输需求的一组路损增益对应的基站组合为 eNBl; 则在 TVWS1上, 新建一个 MBSFN, 由 eNBl , eNB2组成, 在该 区域内由 eNBl在 TVWS1上发送 MBMS。
网络侧的重配模块将 MBMS 及 TVWS 的重配策略通知给 eNBl 和 eNB2, 具体内容如下:
关闭 eNB2在授权频谱上传输 MBMS的时间; 和 开启 eNBl在 TVWS1上传输 MBMS的时间; 和
关闭 eNB 1在 TVWS上传输 MBMS的时间; 和
重新开启 eNBl、 eNB2在授权频谱上传输 MBMS的时间。
然后, eNBl , eNB2将上述 MBMS及 TVWS的重配策略通知给各自服 务的用户。
步驟 402, 确定 eNB3, eNB4之间在 TVWS2上的传播模型为 Hata; 在 eNB3 , eNB4覆盖范围内, 利用 Hata模型计算, 分别计算 { eNB3, eNB4, ( eNB3 , eNB4 ) }这三种基站组合对应的路损增益;
假设能够满足 MBMS 传输需求一组路损增益对应的基站组合为 ( eNB3, eNB4 ); 则在 TVWS2上, 新建一个 MBSFN, 由 eNB3, eNB4 组成, 在该区域内由 eNB3, eNB4在 TVWS2上发送 MBMS。
网络侧的重配模块将 MBMS 及 TVWS 的重配策略通知给 eNB3 和 eNB4, 具体内容如下:
关闭 eNB3和 eNB4在授权频谱上传输 MBMS的时间; 和
开启 eNB3和 eNB4在 TVWS 1上传输 MBMS的时间; 和
关闭 eNB3和 eNB4在 TVWS上传输 MBMS的时间; 和
重新开启 eNB3和 eNB4在授权频谱上传输 MBMS的时间。
然后 , eNB3和 eNB4将上述 MBMS及 TVWS的重配策略通知给各自 服务的用户。
步驟 403 ,对于 eNB5 ,在 TVWS3上的传播模型为 Hata;计算得到 eNB5 对应的路损增益, 但是不能够满足 MBMS传输需求, 则 eNB5保持原有的 MBMS传输不变。
步驟 404,对于 eNB6,在 TVWS4上的传播模型为 Hata;计算得到 eNB6 对应的路损增益 P6, 且能够满足 MBMS传输需求, 则 eNB6在 TVWS4上 传输 MBMS。 网络侧的重配模块将 MBMS及 TVWS的重配策略通知给 eNB6 , 具体 内容如下:
关闭 eNB6在授权频谱上传输 MBMS的时间; 和
开启 eNB6在 TVWS1上传输 MBMS的时间; 和
关闭 eNB6在 TVWS上传输 MBMS的时间; 和
重新开启 eNB6在授权频谱上传输 MBMS的时间。
然后, eNB6将上述 MBMS及 TVWS的重配策略通知给各自服务的用 户。
为了实现上述方法,本发明提供了一种使用 TVWS传输 MBMS的装置, 如图 2所示, 包括:
第一计算单元, 计算具有相同空闲 TVWS的基站中, 各种基站组合在 所述空闲 TVWS上相对于在授权频谱上发送 MBMS的路损增益;
第二计算单元, 用于计算能够满足 MBMS传输需求的路损增益; 重配单元, 用于选择所述满足 MBMS传输需求的路损增益对应的基站 组合在所述空闲 TVWS上传输 MBMS。
所述基站组合包括一个或多个基站。
所述第一计算单元, 还用于将计算得到的基站到自身覆盖范围内在所 述授权频谱上发送 MBMS的最大路损, 减去计算得到的基站在所述 TVWS 上发送 MBMS的最大路损, 得到所述路损增益。
所述第一计算单元, 还用于确定所述具有相同空闲 TVWS的基站中两 两之间在所述空闲 TVWS上使用的传播模型;
所述第一计算单元计算得到的基站在所述 TVWS上发送 MBMS的最大 路损,包括:计算得到的基站到自身覆盖范围内在所述 TVWS上发送 MBMS 的最大路损; 和 /或根据所述传播模型计算得到的基站之间在所述 TVWS上 发送 MBMS的最大路损。 所述第二计算单元, 还用于计算基站在授权频谱上发送 MBMS的合并 增益; 当所述路损增益大于或等于所述合并增益时, 确定所述路损增益满 足 MBMS发送需求。
所述重配单元, 还用于在选择了基站组合在所述空闲 TVWS 上发送 MBMS后, 生成 TVWS和 MBMS的重配策略, 发送给所述具有相同空闲 TVWS的基站。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种使用 TVWS传输 MBMS的方法, 其特征在于, 该方法包括: 计算具有相同空闲电视空白频谱 TVWS的基站中, 各种基站组合在所 述空闲 TVWS上相对于在授权频谱上发送多播组播业务 MBMS的路损增 -',
计算能够满足 MBMS发送需求的路损增益, 并选择对应的基站组合在 所述空闲 TVWS上发送 MBMS。
2、根据权利要求 1所述使用 TVWS传输 MBMS的方法,其特征在于, 所述基站组合包括一个或多个基站。
3、根据权利要求 2所述使用 TVWS传输 MBMS的方法,其特征在于, 计算所述路损增益, 具体包括:
将计算得到的基站到自身覆盖范围内在所述授权频谱上发送 MBMS的 最大路损, 减去计算得到的基站在所述 TVWS上发送 MBMS的最大路损, 得到所述路损增益。
4、根据权利要求 3所述使用 TVWS传输 MBMS的方法,其特征在于, 计算所述路损增益之前, 该方法还包括: 确定所述具有相同空闲 TVWS的 基站中两两之间在所述空闲 TVWS上使用的传播模型。
5、根据权利要求 4所述使用 TVWS传输 MBMS的方法,其特征在于, 所述基站在所述 TVWS上发送 MBMS的最大路损, 包括:
计算得到的基站到自身覆盖范围内在所述 TVWS上发送 MBMS的最大 路损; 和 /或根据所述传播模型计算得到的基站之间在所述 TVWS 上发送 MBMS的最大路损。
6、根据权利要求 5所述使用 TVWS传输 MBMS的方法,其特征在于, 计算能够满足 MBMS发送需求的路损增益, 具体包括:
计算基站在授权频谱上发送 MBMS的合并增益; 当所述路损增益大于或等于所述合并增益时, 所述路损增益满足
MBMS发送需求。
7、根据权利要求 6所述使用 TVWS传输 MBMS的方法,其特征在于, 所述具有相同空闲 TVWS的基站有 N个时, N大于 1 , 该方法还包括: 每种基站组合计算得到一组所述路损增益; 一组所述路损增益包含对 应 N个基站的 N个路损增益。
8、根据权利要求 7所述使用 TVWS传输 MBMS的方法,其特征在于, 当所述 N个路损增益分别大于或等于对应的 N个所述合并增益时, 确定所 述一组路损增益满足 MBMS发送需求, 并选择对应的基站组合在所述空闲 TVWS上发送 MBMS。
9、根据权利要求 7所述使用 TVWS传输 MBMS的方法,其特征在于, 选择基站组合在所述空闲 TVWS上发送 MBMS后, 该方法还包括: 生成 TVWS和 MBMS的重配策略, 发送给所述具有相同空闲 TVWS的基站。
10、 一种使用 TVWS传输 MBMS的装置, 其特征在于, 该装置包括: 第一计算单元, 计算具有相同空闲 TVWS的基站中, 各种基站组合在 所述空闲 TVWS上相对于在授权频谱上发送 MBMS的路损增益;
第二计算单元, 用于计算能够满足 MBMS传输需求的路损增益; 重配单元, 用于选择所述满足 MBMS传输需求的路损增益对应的基站 组合在所述空闲 TVWS上传输 MBMS。
11、 根据权利要求 10所述使用 TVWS传输 MBMS的装置, 其特征在 于, 所述基站组合包括一个或多个基站。
12、 根据权利要求 11所述使用 TVWS传输 MBMS的装置, 其特征在 于,
所述第一计算单元, 还用于将计算得到的基站到自身覆盖范围内在所 述授权频谱上发送 MBMS的最大路损, 减去计算得到的基站在所述 TVWS 上发送 MBMS的最大路损, 得到所述路损增益。
13、 根据权利要求 12所述使用 TVWS传输 MBMS的装置, 其特征在 于,
所述第一计算单元, 还用于确定所述具有相同空闲 TVWS的基站中两 两之间在所述空闲 TVWS上使用的传播模型;
所述第一计算单元计算得到的基站在所述 TVWS上发送 MBMS的最大 路损,包括:计算得到的基站到自身覆盖范围内在所述 TVWS上发送 MBMS 的最大路损; 和 /或根据所述传播模型计算得到的基站之间在所述 TVWS上 发送 MBMS的最大路损。
14、 根据权利要求 13所述使用 TVWS传输 MBMS的装置, 其特征在 于,
所述第二计算单元, 还用于计算基站在授权频谱上发送 MBMS的合并 增益; 当所述路损增益大于或等于所述合并增益时, 确定所述路损增益满 足 MBMS发送需求。
15、 根据权利要求 14所述使用 TVWS传输 MBMS的装置, 其特征在 于,
所述重配单元, 还用于在选择了基站组合在所述空闲 TVWS 上发送 MBMS后, 生成 TVWS和 MBMS的重配策略, 发送给所述具有相同空闲 TVWS的基站。
PCT/CN2011/081195 2010-11-22 2011-10-24 一种使用tvws传输mbms的方法和装置 WO2012068938A1 (zh)

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