WO2008113260A1 - Method, system and base station for transmitting mbms by single frequency network - Google Patents

Method, system and base station for transmitting mbms by single frequency network Download PDF

Info

Publication number
WO2008113260A1
WO2008113260A1 PCT/CN2008/000552 CN2008000552W WO2008113260A1 WO 2008113260 A1 WO2008113260 A1 WO 2008113260A1 CN 2008000552 W CN2008000552 W CN 2008000552W WO 2008113260 A1 WO2008113260 A1 WO 2008113260A1
Authority
WO
WIPO (PCT)
Prior art keywords
broadcast
multicast service
base station
signal
allocated
Prior art date
Application number
PCT/CN2008/000552
Other languages
English (en)
French (fr)
Inventor
Yingmin Wang
Yu Ding
Hongyan Xu
Shiyan Ren
Yuemin Cai
Original Assignee
Datang Mobile Communications Equipment Co., Ltd
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 Datang Mobile Communications Equipment Co., Ltd filed Critical Datang Mobile Communications Equipment Co., Ltd
Priority to KR1020097021546A priority Critical patent/KR101139156B1/ko
Priority to EP08715005.8A priority patent/EP2129152B1/en
Priority to US12/532,015 priority patent/US8451765B2/en
Priority to JP2009553890A priority patent/JP2010521900A/ja
Publication of WO2008113260A1 publication Critical patent/WO2008113260A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method, system and base station for transmitting broadcast/multicast services. Background technique
  • MBMS Multimedia Broadcast I Multicast Service
  • MBMS refers to point-to-multipoint service that sends data to multiple users from one data source, and realizes network resource sharing including mobile core network and access network, especially the sharing of air interface resources.
  • CBS Cell Broadcast Service
  • CBS allows low bit rate data to be sent to all users through the cell shared broadcast channel. It is a message-based service, and 3GPP defines MBMS can not only realize plain text low-rate message-like multicast and broadcast, but also realize high-speed multimedia service multicast and broadcast, such as mobile TV.
  • the MBMS spectrum efficiency is low, usually only 0.2 - 0.02 bit / Hz / s; therefore, in the LTE (Long Term Evolution) project, 3GPP started the E-MBMS (Enhanced Multimedia Broadcast / Multicast Service, Enhanced Broadcast/Multicast Service), and introduced SFN (Single Frequency Network) technology in existing industrial terrestrial broadcasting standards (DVB-H, MediaFLO, etc.) .
  • E-MBMS Enhanced Multimedia Broadcast / Multicast Service, Enhanced Broadcast/Multicast Service
  • SFN Single Frequency Network
  • all cells or sectors in the SFN network use the same physical resources (time, frequency, code channel, scrambling code, and midamble) to transmit the exact same MBMS at the same time, even in the cell or At the edge of the sector, the user can also receive useful signals from different cells or sectors.
  • the terminal can perform energy combining directly on the air interface for all the useful signals received. Therefore, the QoS (Quality of Service) of the MBMS in the entire SFN area is improved.
  • FIG. 1 is a topological diagram of a network structure of an SFN. The following is based on the SFN network structure in FIG. 1 (each cell consists of three sectors, three-sector base station co-site). In 3GPP E-MBMS, the implementation of SFN technology:
  • All the sectors in the SFN are uniformly allocated the time resources, frequency resources, scrambling codes, and midambles used by all the sectors in the SFN as shown in Figure 1, all UEs in the SFN (User
  • the UE will also use the time resource, frequency resource, scrambling code and midamble to receive the broadcast/multicast service, that is, for the UE, as long as it is from the sector signal in the SFN Falling into the window of the UE multipath receiver, the UE can directly combine the energy of all the signals falling into the receiving window, thereby greatly improving the receiving performance of the broadcast/multicast service.
  • the following is an example of implementing a multimedia broadcast/multicast service in an SFN in the prior art.
  • the RNC Radio Network Controller
  • the RNC Radio Network Controller
  • the scrambling code used by the broadcast service and the midamble (a code different from the existing scrambling code and the midamble) are signaled to each Node B and UE; the Node B of each cell or sector uses these specifics.
  • the code is used to form a broadcast/multicast service burst and is transmitted on the same time-frequency resource; the UE receives the same burst simultaneously transmitted by multiple cells or sectors at the corresponding resource location, and then uses the specified midamble code for the channel. It is estimated that the specified scrambling code descrambles the data to solve the desired broadcast/multicast data.
  • Step 1 The network side initiates a broadcast/multicast service, and notifies the R C by signaling, and the RNC determines in which cells or sectors the broadcast/multicast service is transmitted.
  • Step 2 The RNC uniformly allocates broadcast/multicast service resources to these cells or sectors. To facilitate macro diversity, the same time-frequency resources (same frequency points, time slots, and code channels) can be allocated, and the broadcast/ Scrambling code and midamble code used by the multicast service.
  • the scrambling code and the midamble code specified here are different scrambling codes and midamble codes used for non-broadcast/multicast services.
  • a set of scrambling codes and midamble codes with good correlation with the existing scrambling code and the midamble code may be set in advance for the broadcast/multicast service, and the scrambling code and the midamble code for the broadcast/multicast service are specifically used to form a broadcast/group.
  • the broadcast service code group table is stored in the RNC, the UE, and the NodeB.
  • Step 3 When the NodeB transmits the broadcast/multicast service, the specified scrambling code, the midamble code, and the corresponding data are used to form a broadcast service burst, and are sent on the resource allocated by the RNC.
  • Step 4 The UE receives the resource on the corresponding resource according to the resource allocation information sent by the RNC, and the UE receives the signal sent by the multiple cells or sectors, and superimposes all the received useful signals directly on the air interface, and according to The specified midamble code performs channel estimation, obtains total channel estimation results of multiple cells or sectors to the UE, and then despreads the data according to the channel estimation result, despreads and despurs using the specified scrambling code, and obtains The required broadcast/multicast service data.
  • the RNC only needs to specify the broadcast/multicast service burst when the resource is allocated : the scrambling code and the midamble code, and notify the NodeB and the UE, and the NodeB and the UE broadcast according to the specified scrambling code and the midamble/
  • the transmission and reception of multicast service data can simply realize the transmission of multimedia broadcast/multicast services, thereby improving the signal quality of the UE receiving broadcast/multicast services and expanding the coverage of broadcast/multicast services.
  • the broadcast/multicast service is generally transmitted in a hotspot cell or a sector, and the hotspot cell or the sector radius is generally small, the time difference between signals received by the UE from different cells or sectors is not It will be too large, so the physical layer processing requirements for the UE are not too high.
  • the embodiments of the present invention provide a method, a system, and a base station for transmitting a multimedia broadcast/multicast service in a single-frequency network, which are used to solve the problem of transmitting a multimedia broadcast/multicast service in a single-frequency network in a static environment and a low-speed environment. And the edge of adjacent sectors located on the same site is prone to the problem of deep signal fading.
  • a method for transmitting a multimedia broadcast/multicast service over a single frequency network comprising the steps of:
  • the radio network controller sends the broadcast/multicast service data to the base station of the target cell or sector, and allocates the same time-frequency resource, scrambling code, and intermediate code to the cell or sector to transmit the broadcast/group. Broadcasting service data, and transmitting the allocated resource information and code group information to the base station and the terminal of the target cell or sector;
  • the method further includes the following steps:
  • the terminal receives a broadcast/multicast service burst signal from different base stations on the time-frequency resource, and performs channel estimation, despreading, and descrambling processing on the received signal by using the allocated scrambling code and intermediate code to obtain a broadcast. / multicast service data.
  • the step A and the step B further include the following steps:
  • the base station performs spreading and scrambling processing on the broadcast/multicast service data sent by the radio network controller by using the allocated scrambling code, and uses the processed data and the allocated intermediate code to form a broadcast/multicast service. Burst signal.
  • the broadcast/multicast service burst signal is realized by multiplying the broadcast/multicast service burst complex signal in the baseband format or the intermediate frequency format or the radio frequency format by the cos () + y* s in( ⁇ ) complex signal.
  • Random phase rotation processing where ⁇ is the phase rotation factor, which is a random number or pseudo-random number uniformly distributed between 0 and 2 r.
  • the period of change of the random phase is one or several subframes, or one or if Make a time slot.
  • the phase rotation factor sequences used by the plurality of cells or sectors serving the same terminal have no correlation.
  • a system for transmitting multimedia broadcast/multicast services over a single frequency network comprising:
  • a radio network controller configured to send broadcast/multicast service data to a base station of a target cell or a sector, and allocate the same time-frequency resource, 4 sigma, and intermediate code to the cell or sector to transmit the broadcast / multicast service data, the allocated resource information and code group information are sent to the base station and the terminal;
  • the base station is configured to perform random phase rotation processing on the broadcast/multicast service burst signal to be sent, and send the processed signal to the terminal by using the time-frequency resource allocated by the radio network controller.
  • the method further includes:
  • a terminal configured to receive a broadcast/multicast service burst signal from different base stations on the time-frequency resource, perform channel estimation, despreading, and descrambling processing on the received signal by using the allocated scrambling code and intermediate code, Broadcast/multicast service data.
  • a base station comprising:
  • phase processing module configured to perform random phase rotation processing on the broadcast/multicast service burst signal to be sent
  • the signal sending module is configured to send the processed signal to the terminal by using a time-frequency resource allocated by the radio network controller.
  • the method further includes:
  • a burst forming module configured to perform spreading and scrambling processing on the broadcast/multicast service data sent by the radio network controller by using the allocated scrambling code, and using the processed data and the allocated intermediate code to form a broadcast / multicast service burst signal.
  • the base stations of different cells or sectors in the single-frequency network solve the prior art by changing the waveform of the burst signal by performing random phase rotation on the broadcast/multicast service burst signal sent to the terminal.
  • the base stations of different cells or sectors in the single-frequency network solve the prior art by changing the waveform of the burst signal by performing random phase rotation on the broadcast/multicast service burst signal sent to the terminal.
  • FIG. 1 is a topological diagram of a network structure of an SFN in the prior art
  • FIG. 2 is a flow chart of a method for transmitting a multimedia broadcast/multicast service over a single frequency network according to an embodiment of the present invention
  • FIG. 3 is a structural block diagram of a system for transmitting a multimedia broadcast/multicast service in a single frequency network according to an embodiment of the present invention
  • FIG. 4 is a structural block diagram of a base station according to an embodiment of the present invention. detailed description
  • the main technical idea of the embodiments of the present invention is to solve the problem that the waveform of the burst signal is changed by random phase rotation of the broadcast/multicast service burst signal sent to the terminal by the base station of different cells or sectors in the single frequency network to solve the existing
  • the waveform of the burst signal is changed by random phase rotation of the broadcast/multicast service burst signal sent to the terminal by the base station of different cells or sectors in the single frequency network
  • FIG. 2 is a flowchart of a method for transmitting a multimedia broadcast/multicast service in a single frequency network according to an embodiment of the present invention
  • the main implementation process is as follows:
  • Step 20 The network side initiates a broadcast/multicast service, and sends the broadcast/multicast service data to the RNC, where the RC determines the target cell or sector of the broadcast/multicast service data, that is, the broadcast/multicast service data should be In which cells or sectors are transmitted.
  • Step 21 The RNC allocates the same time-frequency resource to the target cell or sector of the broadcast/multicast service.
  • the scrambling code and the intermediate code (midamble), the allocated time-frequency resource information and the code group information are sent to the NodeB and the UE of the target cell or the sector, and the broadcast/multicast service data is sent to the NodeB of the target cell or sector.
  • the scrambling code and midamble assigned by R C to the broadcast/multicast service are different from the non-broadcast/multicast service using a scrambling code and a midamble.
  • the RNC can pre-set a set of scrambling codes and midambles for the broadcast/multicast service with good correlation with the existing scrambling code and midamble, which is dedicated to broadcast/multicast.
  • the scrambling code and the midamble of the service form a broadcast/multicast service code group table, which is stored in the RNC, the UE, and the NodeB.
  • the RNC allocates resources for a certain broadcast/multicast service, one of the pair is selected.
  • the scrambling code and the midcode (midambie) and the corresponding code group identification are notified to the NodeB and the UE, so that the signaling load can be reduced.
  • Step 22 The NodeB performs spreading and scrambling processing on the broadcast/multicast service data delivered by the RNC by using the allocated scrambling code, and uses the processed data and the allocated intermediate code (midamble) to form a broadcast/multicast. Business burst signal.
  • Step 23 The NodeB performs a random phase rotation processing on the broadcast/multicast service burst signal to be sent, and sends the processed signal to the terminal by using the time-frequency resource allocated by the RNC.
  • NodeB There are three ways for NodeB to perform random phase rotation processing on the broadcast/multicast service burst signals to be sent. The following are respectively explained:
  • the first way is: multiplying the broadcast/multicast service burst complex signal in the form of a baseband signal by a Cos( )+_/*sin complex signal, where 6> phase rotation factor is uniformly distributed between 0 and 2 ⁇ . Random number or pseudo-random number. For networks using multiple carriers for the same transmitter, each carrier can be added with the same or different phase rotation factor.
  • the second way is: multiplying the broadcast/multicast service burst complex signal in the form of an intermediate frequency signal by a C 0S (S) + household siii ( ) complex signal, wherein the 0 phase rotation factor is uniformly distributed between 0 and 2 ⁇ Random number or pseudo-random number.
  • each carrier can be added with the same or different phase rotation factor.
  • the third way is: multiplying the broadcast/multicast service burst complex signal in the form of radio frequency signal by the cos( ⁇ )+ *sin( ⁇ ) complex signal, wherein the 0 phase rotation factor is uniformly distributed between 0 and 2 ⁇ . Random number or pseudo-random number.
  • each carrier can be added with the same or different phase rotation factor.
  • the period of change of the random phase may be one or several subframes, or may be one or several time slots.
  • the entire sub-frame signal can be phase-rotated, or only the MBMS time slot can be phase-rotated, or only the service time slot can be phase-rotated.
  • phase rotation factor sequences used by several cells or sectors served by the same terminal have no correlation.
  • phase rotation factor sequences introduced by multiple cells or sectors serving the same terminal do not have correlation, it must be ensured that the phase rotation factor sequence of the cell or sector within a certain range is different, or the phase (phase of the sequence) is different.
  • the same phase rotation factor sequence To ensure that the phase rotation factor sequences introduced by multiple cells or sectors serving the same terminal do not have correlation, it must be ensured that the phase rotation factor sequence of the cell or sector within a certain range is different, or the phase (phase of the sequence) is different. The same phase rotation factor sequence.
  • phase rotation factor sequences generated using random seeds seed generation can be combined with time and NodeB identification to ensure that different cells or sectors used at close distances are used at the same time; or for each cell or sector
  • Different phase rotation factor sequences which may be sequences of the same length long enough to be assigned such that different cells or sectors are assigned different sequence offsets, or may be determined different sequences (such as borrowing scrambling codes or intermediate A code (midamble) or some other sequence that has been assigned to a small or sector).
  • Step 24 The UE receives the broadcast/multicast service burst signal from different base stations on the time-frequency resource according to the time-frequency resource allocated by the RNC, and performs channel estimation on the received signal by using the allocated midamble.
  • the embodiment of the present invention can effectively avoid the rapid fading phenomenon of the static environment, the low-speed environment and the adjacent sector edges of the same site, and greatly improve the transmission performance of the broadcast/multicast service in these environments.
  • the embodiment of the present invention further provides a system for transmitting a multimedia broadcast/multicast service in a single frequency network and a base station.
  • FIG. 3 is a structural block diagram of a system for transmitting a multimedia broadcast/multicast service in a single frequency network according to an embodiment of the present invention, which mainly includes an RNC, a NodeB, and a UE, where
  • An RNC configured to send broadcast/multicast service data initiated by the network side to a NodeB of a target cell or a sector, and allocate the same time-frequency resource, scrambling code, and midamble to the cell or sector for transmission.
  • the broadcast/multicast service data is sent to the NodeB and the UE by the allocated resource information and the code group information;
  • a NodeB configured to perform spreading and scrambling processing on the broadcast/multicast service data delivered by the RNC by using the allocated scrambling code, and use the processed data and the allocated intermediate code (midamble) to form a broadcast/multicast a service burst signal, performing random phase rotation processing on the broadcast/multicast service burst signal, and transmitting the processed signal to the UE by using a time-frequency resource allocated by the radio network controller;
  • a UE configured to receive a broadcast/multicast service burst signal from different NodeBs on the time-frequency resource, and perform channel estimation, despreading, and descrambling on the received signal by using the allocated scrambling code and a midamble (midamble) Processing, obtaining broadcast/multicast service data.
  • FIG. 4 is a structural block diagram of a base station according to an embodiment of the present invention, which mainly includes:
  • a burst forming module configured to perform spreading and scrambling processing on the broadcast/multicast service data sent by the radio network controller by using the allocated scrambling code, using the processed data and the allocated midamble (midamble) ) composing a broadcast/multicast service burst signal;
  • phase processing module configured to perform random phase rotation processing on the broadcast/multicast service burst signal to be sent
  • the signal sending module is configured to send the processed signal to the terminal by using a time-frequency resource allocated by the radio network controller.

Landscapes

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

Description

单频网络传输多媒体广播 /组播业务的方法、 系统及基站 . 技术领域
本发明涉及移动通信领域， 尤其涉及传输广播 /组播业务的方法、 系统及 基站。 背景技术
随着移动通信和 Internet网络的迅速发展，大量移动多媒体业务涌现出来， 其中一些应用业务， 如视频点播、 电视广播、 视频会议、 网上教育、 互动游 戏等等， 需要多个用户同时接收相同的数据。 这些移动多媒体业务和一般数 据业务相比， 具有数据量大、 持续时间长的特点。 为了有效地利用移动网络 资源， 全球标准化组织 3GPP提出 MBMS ( Multimedia Broadcast I Multicast Service, 多媒体广播 /组播业务）。 MBMS 是指由一个数据源向多个用户发送 数据的点到多点业务， 实现了包括移动核心网和接入网的网络资源共享， 尤 其是空口资源的共享。 MBMS 与现有移动网络中的 CBS ( Cell Broadcast Service, 小区广播业务）有所不同， CBS 允许低比特率数据通过小区共享广 播信道向所有用户发送， 是一种基于消息的业务， 而 3GPP定义的 MBMS不 仅能实现纯文本低速率的消息类组播和广播， 而且能实现高速率的多媒体业 务组播和广播， 例如手机电视等业务。
但在原有的 Rd6版本所定义的系统中， MBMS频谱效率较低， 通常只有 0.2 - 0.02bit/Hz/s;因此在 LTE( Long Term Evolution,长期演进）项目中， 3GPP 开始了对 E-MBMS ( Enhanced Multimedia Broadcast / Multicast Service, 增强 型广播 /组播业务） 的研究， 并引入了现有的工业地面广播标准 （DVB-H、 MediaFLO等） 中的 SFN ( Single Frequency Network, 单频网络）技术。 即在 SFN 网络中的所有小区或扇区在相同的时间， 利用完全相同的物理资源 （时 间、 频率、 码道、 扰码和中间码（midamble ) )发送完全相同的 MBMS, 这样 即使在小区或扇区边缘， 用户也可以接收到来自不同小区或扇区的有用信号， 终端可以对接收到的所有有用信号直接在空口进行能量合并。 从而提高了整 个 SFN区域范围的 MBMS的 QoS ( Quality of Service, 服务质量）。
请参阅图 1 ,该图为一种 SFN的网络结构拓朴图，下面基于图 1中的 SFN 网络结构 （每个蜂窝小区由三扇区组成， 三扇区的基站共站址）举例说明目 前在 3GPP的 E-MBMS中， SFN技术的实现方式：
为图 1 所示 SFN中的所有扇区统一分配完全相同的广播 /组播业务所使 用的时间资源、频率资源、扰码和中间码（midamble ), SFN中的所有 UE( User
Equipment, 用户设备）也将使用所述时间资源、 频率资源、 扰码和中间码 ( midamble )来接收该广播 /组播业务，也就是说对 UE来说，只要是来自 SFN 中的扇区信号落入到 UE多径接收机的窗口内， UE就可以对所有落入到接收 窗内的信号直接进行能量合并， 从而大大提高了广播 /组播业务的接收性能。
下面举例说明现有技术中一种在 SFN中传输多媒体广播 /组播业务的实现 过程二
当在多个小区或扇区中传输广播 /组播业务时， RNC ( Radio Network Controller,无线网络控制器）为多个小区或扇区统一分配广播 /组播业务资源， 并指定该广播 /组播业务使用的扰码和中间码（ midamble ) (与现有扰码和中间 码（midamble )不同的码）， 通过信令告知各 Node B和 UE; 各小区或扇区的 Node B使用这些特定码来形成广播 /组播业务突发， 并在相同的时频资源上进 行传输； UE在相应资源位置接收到多个小区或扇区同时传输的相同突发， 之 后采用指定的 midamble码进行信道估计， 以及指定的扰码对数据进行解扰， 就可解出所要的广播 /组播^务数据。
主要步骤如下：
步驟 1、 网络侧发起一个广播 /组播业务， 通过信令通知 R C， RNC判断 该广播 /组播业务在哪些小区或扇区中进行传输。
步骤 2、 RNC为这些小区或扇区统一分配广播 /组播业务资源， 为了方便 实现宏分集， 可以分配相同的时频资源 （相同的频点、 时隙和码道）， 并指定 该广播 /组播业务所使用的扰码和 midamble码。 这里指定的扰码和 midamble码是与非广播 /组播业务采用不同的扰码和 midamble码。
可以预先为广播 /组播业务设置一组与现有扰码和 midamble码相关性较 好的扰码和 midamble码， 专门用于广播 /组播业务的扰码和 midamble码， 形 成一个广播 /组播业务码组表， 保存在 RNC、 UE和 NodeB中， R C在为某个 广播 /组播业务分配资源时 , 选定其中一对码并将相应的码组标识通知 NodeB 和 UE， 这样可以减少信令负荷。
步骤 3、 NodeB传输该广播 /组播业务时， 使用指定的扰码、 midamble码 和相应的数据组成广播业务突发， 在 RNC所分配的资源上进行发送。
步骤 4、 UE根据 RNC发送的资源分配信息， 在相应的资源上进行接收， UE将接收到多个小区或扇区发送下来的信号，对接收到的所有有用信号直接 在空口进行叠加， 并根据指定的 midamble码进行信道估计， 获得多个小区或 扇区到 UE的总的信道估计结果， 之后根据此信道估计结果对数据进行解扩， 解扩后使用指定的扰码进行解扰， 就获得了需要的广播 /组播业务数据。
通过上述步骤可知， RNC只需在分配资源时指定广播 /组播业务突发所使 : 用的扰码和 midamble码， 并通知 NodeB和 UE, NodeB和 UE根据指定的扰 码和 midamble进行广播 /组播业务数据的发送和接收，即可简单的实现多媒体 广播 /组播业务的传输， 从而提高了 UE接收广播 /组播业务的信号质量， 并扩 大了广播 /组播业务的覆盖范围。 另外， 由于广播 /组播业务一般在热点小区或 扇区进行发送， 而热点小区或扇区半径一般都较小， 因此 UE接收到的多路来 自不同小区或扇区的信号之间的时间差不会太大，这样对 UE的物理层处理要 求不是太高。
上述现有技术对传统的 MBMS业务的传输有了极大的改善， 但是仍旧存在 着一些没有解决的缺陷， 对于从多个小区或扇区接收的信号叠加产生的深衰 落现象， 即由于在两个小区或扇区发送相同的信号， 如果信号到达终端接收 机的时间相同并且相位是完全反向的， 接收信号质量会出现非常恶劣的恶化 的现象， 并没有予以解决。 这种现象在静态环境， 低速环境及位于相同站址 上的两个相邻扇区边缘显得尤为突出。 发明内容
本发明实施例提供一种单频网络传输多媒体广播 /组播业务的方法、 系统 及基站， 用以解决现有技术在单频网络中传输多媒体广播 /组播业务时， 在静 态环境， 低速环境及位于同一站址上的相邻扇区边缘容易出现信号深衰落现 象的问题。
本发明实施例技术方案包括：
一种单频网络传输多媒体广播 /组播业务的方法， 包括步骤：
A、 无线网络控制器将广播 /组播业务数据发送给目标小区或扇区的基站， 并为所述小区或扇区分配相同的时频资源、 扰码和中间码以传输所述广播 /组 播业务数据， 将分配的资源信息及码组信息下发给目标小区或扇区的基站和 终端；
B、 所述基站对待发送的广播 /组播业务突发信号进行随机相位旋转处理， 利用无线网络控制器分配的时频资源将处理后得到的信号发送给终端。
较佳的， 所述步骤 B后还包括步骤：
所述终端在所述时频资源上接收来自不同基站的广播 /组播业务突发信 号， 利用所述分配的扰码和中间码对接收到信号进行信道估计、 解扩和解扰 处理， 得到广播 /组播业务数据。
较佳的， 所述步骤 A与步骤 B之间还包括步骤：
所述基站利用所述分配的扰码对无线网络控制器下发的广播 /組播业务数 据进行扩频和加扰处理， 使用处理后的数据和所述分配的中间码组成广播 /组 播业务突发信号。
较佳的， 通过将基带形式或中频形式或射频形式的广播 /组播业务突发复 信号乘以 cos( ) + y* sin(^)复信号， 实现对广播 /组播业务突发信号的随机相位 旋转处理，其中 ^为相位旋转因子，为 0 ~ 2 r间均匀分布的随机数或伪随机数。
较佳的， 所述随机相位的变化周期为一个或若干个子帧， 或者一个或若 干个时隙。
较佳的， 所述为同一终端服务的若干个小区或扇区釆用的相位旋转因子 序列不具有相关性。
一种单频网络传输多媒体广播 /组播业务的系统， 包括：
无线网络控制器， 用于将广播 /组播业务数据发送给目标小区或扇区的基 站， 并为所述小区或扇区分配相同的时频资源、 4尤码和中间码以传输所述广 播 /组播业务数据， 将分配的资源信息及码组信息下发给基站和终端；
基站， 用于对待发送的广播 /组播业务突发信号进行随机相位旋转处理， 利用无线网络控制器分配的时频资源将处理后得到的信号发送给终端。
较佳的， 还包括：
终端， 用于在所述时频资源上接收来自不同基站的广播 /组播业务突发信 号， 利用所述分配的扰码和中间码对接收到信号进行信道估计、 解扩和解扰 处理， 得到广播 /组播业务数据。
一种基站， 包括：
相位处理模块， 用于对待发送的广播 /组播业务突发信号进行随机相位旋 转处理；
信号发送模块， 用于利用无线网络控制器分配的时频资源将处理后得到 的信号发送给终端。
较佳的， 还包括：
突发形成模块， 用于利用所述分配的扰码对无线网络控制器下发的广播 / 组播业务数据进行扩频和加扰处理， 使用处理后的数据和所述分配的中间码 组成广播 /组播业务突发信号。
本发明有益效果如下：
本发明实施例技术方案中单频网絡中不同小区或扇区的基站通过将发往 终端的广播 /组播业务突发信号进行随机相位旋转以改变突发信号的波形， 从 而解决现有技术中在单频网络中传输多媒体广播 /组播业务时， 在静态环境， 低速环境及位于同一站址上的相邻扇区边缘， 若来自两个基站的信号到达终 端的时间相同且相位相反， 会出现信号深衰落现象的问题， 从而大大提高了 这些环境下广播 /组播业务的传输性能， 同时改善了终端在这些环境下的接收 机性能， 本发明实施例技术方案的实现简单易行， 不需要额外花费任何硬件 成本》 附图说明
图 1为现有技术中一种 SFN的网络结构拓朴图；
图 2 为本发明实施例单频网络传输多媒体广播 /组播业务的方法的流程 图；
图 3为本发明实施例单频网络传输多媒体广播 /组播业务的系统的结构框 图；
图 4为本发明实施例基站的结构框图。 具体实施方式
本发明实施例的主要技术构思是通过由单频网络中不同小区或扇区的基 站将发往终端的广播 /组播业务突发信号进行随机相位旋转改变突发信号的波 形， 以解决现有技术中在单频网络中传输多媒体广播 /组播业务时， 在静态环 境， 低速环境及位于同一站址上的相邻扇区边缘， 若来自两个基站的信号到 达终端的时间相同且相位相反， 则会出现信号深衰落现象的问题。
下面将结合附图对本发明实施例的具体实现过程进行进一步详细的阐 述。
请参阅图 2, 该图为本发明实施例单频网络传输多媒体广播 /组播业务的 方法的流程图， 其主要实现过程为：
步骤 20、 网络侧发起一个广播 /组播业务，将该广播 /组播业务数据发送给 RNC, R C 确定该广播 /组播业务数据的目标小区或扇区， 即该广播 /组播业 务数据应在哪些小区或扇区中进行传输。
步骤 21、 RNC为广播 /组播业务的目标小区或扇区分配相同的时频资源、 扰码和中间码（midamble ), 将分配的时频资源信息及码组信息下发给目标小 区或扇区的 NodeB和 UE， 并将广播 /组播业务 据发送给目标小区或扇区的 NodeB
R C为广播 /组播业务分配的扰码和中间码（ midamble )是与非广播 /组播 业务采用不同的扰码和中间码（midamble )。
为减少信令负荷， RNC可以预先为广播 /组播业务设置一组与现有扰码和 中间码（midamble )相关性较好的扰码和中间码（midamble ), 专门用于广播 /组播业务的扰码和中间码（midamble ), 形成一个广播 /组播业务码组表， 保 存在 RNC、 UE和 NodeB中， RNC在为某个广播 /组播业务分配资源时， 选定 其中一对扰码和中间码（ midambie )并将相应的码组标识通知 NodeB和 UE, 从而可以减少信令负荷。
步骤 22、 NodeB利用所述分配的扰码对 RNC下发的广播 /组播业务数据 进行扩频和加扰处理， 使用处理后的数据和所述分配的中间码（midamble ) 组成广播 /组播业务突发信号。
步骤 23、 NodeB对待发送的广播 /组播业务突发信号进行随机相位旋转处 理， 利用 RNC分配的时频资源将处理后得到的信号发送给终端。
NodeB对待发送的广播 /组播业务突发信号进行随机相位旋转处理的方式 有以下三种， 下面分别予以说明：
第一种方式为： 将基带信号形式的广播 /组播业务突发复信号与 Cos( )+_/*sin 复信号相乘， 其中 6>相位旋转因子， 为 0~2 τ间均匀分布的随机 数或伪随机数， 对于同一发射机使用多个载波的网络， 各载波可以分别加相 同或不同的相位旋转因子。
第二种方式为： 将中频信号形式的广播 /组播业务突发复信号与 C0S(S)+户 siii( )复信号相乘， 其中 0相位旋转因子， 为 0~2 τ间均匀分布的随机 数或伪随机数， 对于同一发射机使用多个载波的网络， 各载波可以分别加相 同或不同的相位旋转因子。 第三种方式为： 将射频信号形式的广播 /组播业务突发复信号与 cos(^)+ *sin(^)复信号相乘， 其中 0相位旋转因子， 为 0~2π间均匀分布的随机 数或伪随机数， 对于同一发射机使用多个载波的网络， 各载波可以分别加相 同或不同的相位旋转因子。
其中， 所述随机相位的变化周期可以为一个或若干个子帧， 也可以为一 个或若干个时隙。 以子帧为单位变化时， 可以对整个子帧信号都进行相位旋 转， 也可以只对 MBMS时隙进行相位旋转， 或只对业务时隙进行相位旋转。
SFN 中不同小区或扇区引入随机相位旋转时， 应保证为同一终端服务的 若干个小区或扇区采用的相位旋转因子序列不具有相关性。
要保证为同一终端服务的多个小区或扇区引入的相位旋转因子序列不具 有相关性， 必须保证一定范围内的小区或扇区的相位旋转因子序列不同， 或 者使用相位（序列的相位）不同的同一相位旋转因子序列。
对于使用随机种子产生的相位旋转因子序列， 种子的产生可以与时间和 NodeB 标识相结合， 保证近距离的不同小区或扇区在相同时间使用的种子是 不同的； 或者给各小区或扇区分配不同的相位旋转因子序列， 这个序列可以 是同一个长度足够长的序列， 通过规划使得近距离的小区或扇区分配不同的 序列偏移， 亦可以是确定的不同序列 （如借用扰码或中间码（midamble )等 一些已经分配给小 或扇区的序列）。
步骤 24、 UE按照 RNC分配的时频资源在该时频资源上接收来自不同基 站的广播 /组播业务突发信号， 利用所述分配的中间码（midamble )对接收到 信号进行信道估计，获得多个小区或扇区到 UE的总的信道条件，之后根据此 信道估计结果对数据进行解扩， 解扩后使用指定的扰码进行解扰， 得到广播 / 组播业务数据。
采用本发明实施例中的上述方法能够有效的避免静态环境、 低速环境及 相同站址的相邻扇区边缘出现的信 快速衰落现象， 大大提高了这些环境下 广播 /组播业务的传输性能。 相应于本发明实施例中的上述方法， 本发明实施例进而提出了一种单频 网络传输多媒体广播 /组播业务的系统以及一种基站。
请参阅图 3， 该图为本发明实施例单频网络传输多媒体广播 /组播业务的 系统的结构框图， 其主要包括 RNC、 NodeB和 UE, 其中，
RNC, 用于将网络侧发起的广播 /组播业务数据发送给目标小区或扇区的 NodeB,并为所述小区或扇区分配相同的时频资源、扰码和中间码（midamble ) 以传输所述广播 /组播业务数据， 将分配的资源信息及码组信息下发给 NodeB 和 UE;
NodeB,用于利用所述分配的扰码对 RNC下发的广播 /组播业务数据进行 扩频和加扰处理， 使用处理后的数据和所述分配的中间码（midamble )组成 广播 /组播业务突发信号， 对该广播 /组播业务突发信号进行随机相位旋转处 理， 利用无线网络控制器分配的时频资源将处理后得到的信号发送给 UE;
UE, 用于在所述时频资源上接收来自不同 NodeB 的广播 /组播业务突发 信号， 利用所述分配的扰码和中间码（midamble )对接收到信号进行信道估 计、 解扩和解扰处理， 得到广播 /组播业务数据。
本发明实施例所述系统的具体工作过程请参阅本发明上述方法的描述， 这里不再给予过多赘述。
请参阅图 4， 该图为本发明实施例基站的结构框图， 主要包括：
突发形成模块， 用于利用所述分配的扰码对无线网络控制器下发的广播 / 组播业务数据进行扩频和加扰处理， 使用处理后的数据和所述分配的中间码 ( midamble )组成广播 /组播业务突发信号；
相位处理模块， 用于对待发送的广播 /组播业务突发信号进行随机相位旋 转处理；
信号发送模块， 用于利用无线网络控制器分配的时频资源将处理后得到 的信号发送给终端。
本发明实施例所述基站的具体工作过程请参阅本发明实施例上述方法的 描述， 这里不再给予过多赘述。 发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种单频网络传输多媒体广播 /组播业务的方法， 其特征在于， 包括步 骤：
A、 无线网络控制器将广播 /组播业务数据发送给目标小区或扇区的基站， 并为所述小区或扇区分配相同的时频资源、 扰码和中间码以传输所迷广播 /组 播业务数据， 将分配的资源信息及码组信息下发给目标小区或扇区的基站和 终端；
B、 所述基站对待发送的广播 /组播业务突发信号进行随机相位旋转处理， 利用无线网络控制器分配的时频资源将处理后得到的信号发送给终端。
2、 如权利要求 1所述的方法， 其特征在于， 所述步骤 B后还包括步骤： 所述终端在所述时频资源上接收来自不同基站的广播 /组播业务突发信 号， 利用所述分配的扰码和中间码对接收到信号进行信道估计、 解扩和解扰 处理， 得到广播 /组播业务数据。
3、 如权利要求 1或 2所述的方法， 其特征在于， 所述步骤 A与步骤 B 之间还包括步骤：
所述基站利用所述分配的扰码对无线网络控制器下发的广播 /组播业务数 据进行扩频和加扰处理， 使用处理后的数据和所述分配的中间码组成广播 /组 播业务突发信号。
4、 如权利要求 1所述的方法， 其特征在于， 通过将基带形式或中频形式 或射频形式的广播 /组播业务突发复信号乘以 cos(^) + sin (^复信号， 实现对 广播 /组播业务突发信号的随机相位旋转处理， 其中 0为相位旋转因子'， 为 0 ~ 2 r间均匀分布的随机数或伪随机数。
5、 如权利要求 4所述的方法， 其特征在于， 所述随机相位的变化周期为 一个或若干个子帧， 或者一个或若干个时隙。
6、 如权利要求 4所述的方法， 其特征在于， 所述为同一终端服务的若干 个小区或扇区采用的相位旋转因子序列不具有相关性。
7、 一种单频网络传输多媒体广播 /组播业务的系统， 其特征在于， 包括: . 无线网络控制器， 用于将广播 /组播业务数据发送给目标小区或扇区的基 站， 并为所述小区或扇区分配相同的时频资源、 扰码和中间码以'传输所述广' 播 /组播业务数据， 将分配的资源信息及码组信息下发给基站和终端；
基站， 用于对待发送的广播 /组播业务突发信号进行随机相位旋转处理， 利用无线网络控制器分配的时频资源将处理后得到的信号发送给终端。
8、 如权利要求 7所述的系统， 其特征在于， 还包括：
终端， 用于在所述时频资源上接收来自不同基站的广播 /组播业务突发信 号， 利用所述分配的扰码和中间码对接收到信号进行信道估计、 解扩和解扰 处理， 得到广播 /组播业务数据。
9、 一种基站， 其特征 于， 包括：
相位处理模块， 用于对待发送的广播 /组播业务突发信号进行随机相位旋 转处理；
信号发送模块， 用于利用无线网络控制器分配的时频资源将处理后得到 的信号发送给终端。
10、 如权利要求 9所述的基站， 其特征在于， 还包括：
突发形成模块， 用于利用所述分配的扰码对无线网络控制器下发的广播 / 组播业务数据进行扩频和加扰处理， 使用处理后的数据和所述分配的中间码 组成广播 /组播业务突发信号。
PCT/CN2008/000552 2007-03-20 2008-03-20 Method, system and base station for transmitting mbms by single frequency network WO2008113260A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020097021546A KR101139156B1 (ko) 2007-03-20 2008-03-20 단일 주파수 네트워크에서 브로드캐스트/멀티캐스트 업무를 전송하는 방법, 시스템 및 기지국
EP08715005.8A EP2129152B1 (en) 2007-03-20 2008-03-20 Method, system and base station for transmitting mbms by single frequency network
US12/532,015 US8451765B2 (en) 2007-03-20 2008-03-20 Method, system and base station for transmitting MBMS in single frequency network
JP2009553890A JP2010521900A (ja) 2007-03-20 2008-03-20 単一周波数ネットワークにおけるブロードキャスト／マルチキャストサービスの伝送方法、システム、基地局

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710064571.1 2007-03-20
CN2007100645711A CN101272522B (zh) 2007-03-20 2007-03-20 单频网络传输多媒体广播/组播业务的方法、系统及基站

Publications (1)

Publication Number Publication Date
WO2008113260A1 true WO2008113260A1 (en) 2008-09-25

Family

ID=39765377

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2008/000552 WO2008113260A1 (en) 2007-03-20 2008-03-20 Method, system and base station for transmitting mbms by single frequency network

Country Status (6)

Country Link
US (1) US8451765B2 (zh)
EP (1) EP2129152B1 (zh)
JP (1) JP2010521900A (zh)
KR (1) KR101139156B1 (zh)
CN (1) CN101272522B (zh)
WO (1) WO2008113260A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113015102A (zh) * 2019-12-18 2021-06-22 北京新岸线移动多媒体技术有限公司 一种实现区域性数据广播的方法及系统

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101272522B (zh) * 2007-03-20 2010-10-27 大唐移动通信设备有限公司 单频网络传输多媒体广播/组播业务的方法、系统及基站
KR20100083271A (ko) * 2009-01-13 2010-07-22 삼성전자주식회사 휴대 방송 서비스 공유 방법 및 장치
CN101835096B (zh) * 2009-03-13 2014-07-16 中兴通讯股份有限公司南京分公司 一种多媒体广播组播业务的承载方法及控制装置
WO2010124417A1 (zh) * 2009-04-28 2010-11-04 上海贝尔股份有限公司 无线通信系统中控制mbms业务接收的方法和装置
US8243637B2 (en) * 2009-05-29 2012-08-14 Alcatel Lucent Method and apparatus for mobile broadcast and multicast using randomized transmit signal phases in a single frequency network
WO2010146617A1 (ja) 2009-06-15 2010-12-23 富士通株式会社 無線通信システム、基地局装置、端末装置、及び無線通信システムにおける無線通信方法
JP4901947B2 (ja) * 2009-12-16 2012-03-21 株式会社エヌ・ティ・ティ・ドコモ 制御装置及び移動通信方法
CN102420678B (zh) * 2010-09-28 2016-03-30 中兴通讯股份有限公司 独立midamble配置信息的通知方法和系统
WO2014062996A2 (en) 2012-10-19 2014-04-24 Parallel Wireless Inc. Wireless broadband network with integrated streaming multimedia services
US9319851B2 (en) 2013-03-22 2016-04-19 Mediatek, Inc. Radio resource efficient transmission for group communication over LTE eMBMS
CN104754584B (zh) * 2013-12-30 2018-02-27 北京神州泰岳软件股份有限公司 无线网络频率分配方法和系统
US9876585B2 (en) * 2015-07-03 2018-01-23 Huawei Technologies Co., Ltd. Method and system for partitioning signal processing chains in a communication network
US10645540B2 (en) * 2018-07-02 2020-05-05 Lenovo (Singapore) Pte Ltd Applying random phase to multicast data

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1270548C (zh) * 2002-07-31 2006-08-16 三星电子株式会社 提供多媒体广播/多播业务的方法和移动通信系统
CN1833413A (zh) * 2003-08-08 2006-09-13 三星电子株式会社 用于为多媒体广播/多播服务配置协议的方法和设备
CN1836387A (zh) * 2003-08-22 2006-09-20 三星电子株式会社 用于在支持多媒体广播/组播业务的移动通信系统中接收分组数据的小区重选方法

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE419581B (sv) * 1980-09-12 1981-08-10 Ericsson Telefon Ab L M Anordning i ett radarsystem for korrektion av fas- och amplitudfel, som uppstar i kvadraturdetektorn
JPH10190612A (ja) * 1996-12-26 1998-07-21 Sony Corp 通信方法及び受信装置
JP3349918B2 (ja) * 1997-04-09 2002-11-25 沖電気工業株式会社 通信システム、送信装置及び受信装置
JP2001285244A (ja) * 2000-03-30 2001-10-12 Matsushita Electric Ind Co Ltd Ｏｆｄｍ送信システム
JP4212768B2 (ja) * 2000-07-13 2009-01-21 三菱電機株式会社 無線通信システム
US20030109282A1 (en) * 2001-12-06 2003-06-12 Itzhak Shperling Method and base station for providing phase-shift transmit diversity
US7177658B2 (en) * 2002-05-06 2007-02-13 Qualcomm, Incorporated Multi-media broadcast and multicast service (MBMS) in a wireless communications system
KR20040026153A (ko) * 2002-09-23 2004-03-30 엘지전자 주식회사 무선통신의 공유채널을 통한 멀티캐스트 서비스 제공 방법및 장치
KR20050013451A (ko) * 2003-07-28 2005-02-04 삼성전자주식회사 멀티캐스트 멀티미디어 방송 서비스를 제공하는부호분할다중접속 이동통신시스템에서 소프트 핸드오버결정장치 및 방법
JP2007502070A (ja) 2003-08-08 2007-02-01 サムスン エレクトロニクス カンパニー リミテッド マルチメディアブロードキャスト／マルチキャストサービスのためのプロトコルを構成する方法及び装置
CN1839567B (zh) * 2003-08-21 2010-05-26 株式会社Ntt都科摩 移动通信系统、移动站以及无线控制装置
JP4317221B2 (ja) 2003-08-22 2009-08-19 サムスン エレクトロニクス カンパニー リミテッド マルチメディアブロードキャスト／マルチキャストサービス（ｍｂｍｓ）を提供する移動通信システムにおけるパケットデータを受信するためのセル再選択方法
KR100547787B1 (ko) * 2003-09-26 2006-01-31 삼성전자주식회사 시분할-부호분할다중접속 이동통신시스템에서 기지국수신기가 미드엠블을 이용하여 간섭신호를 제거하는 장치및 방법
WO2008047722A1 (fr) * 2006-10-13 2008-04-24 Sharp Kabushiki Kaisha Système de communication mobile, dipositif de commande, procédé de commande de dispositif de station de base et programme
CN101272522B (zh) * 2007-03-20 2010-10-27 大唐移动通信设备有限公司 单频网络传输多媒体广播/组播业务的方法、系统及基站

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1270548C (zh) * 2002-07-31 2006-08-16 三星电子株式会社 提供多媒体广播/多播业务的方法和移动通信系统
CN1833413A (zh) * 2003-08-08 2006-09-13 三星电子株式会社 用于为多媒体广播/多播服务配置协议的方法和设备
CN1836387A (zh) * 2003-08-22 2006-09-20 三星电子株式会社 用于在支持多媒体广播/组播业务的移动通信系统中接收分组数据的小区重选方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2129152A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113015102A (zh) * 2019-12-18 2021-06-22 北京新岸线移动多媒体技术有限公司 一种实现区域性数据广播的方法及系统

Also Published As

Publication number Publication date
CN101272522A (zh) 2008-09-24
EP2129152A4 (en) 2013-01-02
KR101139156B1 (ko) 2012-04-26
EP2129152A1 (en) 2009-12-02
JP2010521900A (ja) 2010-06-24
US8451765B2 (en) 2013-05-28
KR20090120002A (ko) 2009-11-23
CN101272522B (zh) 2010-10-27
US20100103855A1 (en) 2010-04-29
EP2129152B1 (en) 2015-02-25

Similar Documents

Publication Publication Date Title
WO2008113260A1 (en) Method, system and base station for transmitting mbms by single frequency network
EP2299742B1 (en) Broadcast communication in a cellular communication system
CN101262635B (zh) 一种在多载波小区实现增强mbms业务的方法
KR102226787B1 (ko) Lte 브로드캐스트를 위한 낮은 오버헤드를 갖는 확장된 지속기간 사이클릭 프리픽스
US9692534B2 (en) Cellular communication system, communication units, and method for broadcast and unicast communication
EP2101510B1 (en) A method,system and base station for transmitting broadcast services data over a single frequency network
Urie et al. Evolved multimedia broadcast multicast service in LTE: An assessment of system performance under realistic radio network engineering conditions
EP2087622B1 (en) Cellular communication system, communication unit and method for broadcast communication
CN100574129C (zh) 时分同步码分多址接入系统中发送广播业务的方法、装置及系统
Richter et al. System-level simulation of a multilayer broadcast and broadband system
CN101515856B (zh) 非透明中继站模式下多媒体广播多播业务的发射方法
WO2009009946A1 (fr) Procédé pour réaliser un service de diffusion/multidiffusion multimédia amélioré dans une cellule multiporteuse
CN101516060A (zh) 一种多媒体广播和组播业务的发射和接收方法
WO2009033366A1 (fr) Procédé et appareil de multiplexage de service d'un système de diffusion en multidiffusion
CN101296394A (zh) 无线通讯系统中多载频小区提供mbms业务的方法及设备

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08715005

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 5503/CHENP/2009

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 2009553890

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: 2008715005

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20097021546

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 12532015

Country of ref document: US