WO2008061437A1 - A method and system for transmitting broadcast services data over a single frequency network and a base station - Google Patents

A method and system for transmitting broadcast services data over a single frequency network and a base station Download PDF

Info

Publication number
WO2008061437A1
WO2008061437A1 PCT/CN2007/003227 CN2007003227W WO2008061437A1 WO 2008061437 A1 WO2008061437 A1 WO 2008061437A1 CN 2007003227 W CN2007003227 W CN 2007003227W WO 2008061437 A1 WO2008061437 A1 WO 2008061437A1
Authority
WO
WIPO (PCT)
Prior art keywords
sector
broadcast service
service data
base station
transmission time
Prior art date
Application number
PCT/CN2007/003227
Other languages
English (en)
French (fr)
Inventor
Yingmin Wang
Yu Ding
Jiajun Yang
Lei Mao
Junyun Yang
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 EP07816833.3A priority Critical patent/EP2101510B1/en
Priority to JP2009536586A priority patent/JP5089703B2/ja
Priority to US12/515,675 priority patent/US8848589B2/en
Publication of WO2008061437A1 publication Critical patent/WO2008061437A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/71—Wireless systems
    • 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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method, system, and base station for transmitting broadcast service data in an intra-frequency network. Background technique
  • MBMS Multimedia Broadcast I Multicast Service
  • 3GPP 3rd Generation Partnership Project
  • MBMS refers to a point-to-multipoint service in which a data source sends data to multiple users, and realizes network resource sharing, including mobile core network and access network resource sharing, especially air interface resources.
  • MBMS can not only realize low-rate message-like multicast and broadcast, but also realize high-speed multimedia service multicast and broadcast, such as mobile TV.
  • E-MBMS Enhanced Multimedia Broadcast I Multicast Service
  • SFN Single Frequency Network
  • SFN transmission technology means that all cells in the SFN network transmit the same MBMS service at the same time and using the same physical resources, such as frequency, code channel, scrambling code and channel estimation code, so that even at the cell edge In the zone, the user terminal can also receive useful signals from different cells, and the user terminal can not only perform energy combining directly on the air interface used for the received useful signal, but also can obtain diversity gain from different paths.
  • Figure 1 shows an SFN network. The topology diagram of the structure, each cell in the network is composed of three sectors and three sectors are co-sites, that is, the base stations of the three sectors are the same. The network structure is taken as an example to illustrate the current E-in 3GPP.
  • the Radio Network Control uniformly allocates the time used by the same broadcast service to all sectors in the SFN network.
  • the user terminal in the cell will also use the time resource, the frequency resource and the scrambling code, and the channel estimation code to receive the broadcast service, that is, for the user terminal, as long as the resource, the frequency resource and the scrambling code, and the channel estimation code.
  • the sector signal from the SFN network falls into the window of the multi-path receiver of the user terminal, and the user terminal can directly combine the energy of all the signals falling into the receiving window, thereby greatly improving the receiving performance of the broadcast service. .
  • the following describes an implementation method of E-MBMS transmission in an existing SFN network based on a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, see FIG. 2, when the core network initiates a broadcast service and transmits the broadcast service in multiple sectors, the RNC uniformly allocates the same broadcast service resource to the base stations of the multiple sectors, where the service resource includes the sending time, the sending frequency, and the use of the broadcast service.
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • the base station of each sector composes the broadcast service data into a broadcast service signal according to the specific code, and
  • the broadcast service signal is sent by using the service resource allocated by the RNC; after receiving the same broadcast service signal sent by multiple cells at the corresponding resource location, the user terminal uses the specified midamble code for channel estimation, and the specified scrambling code to solve the data. If you are disturbed, you can get the desired broadcast service data.
  • the main steps are as follows:
  • Step 1 The core network initiates a broadcast service, and the RNC is notified by signaling, and the RNC determines in which sectors to transmit;
  • Step 2 The RC uniformly allocates the same broadcast service resources to the base stations of the sectors, including the same transmission time, transmission frequency, transmission code channel, and scrambling code and midamble code used by the broadcast service.
  • the code specified here is existing.
  • a set of codes that have good correlation with the existing scrambling code and the midamble code can be found in advance for the broadcast service, and the scrambling code and the midamble code of the broadcast service are specifically used to form a broadcast service code group table, and are saved in the broadcast service.
  • the RNC the user terminal, and the base station, when the RNC allocates resources for a certain broadcast service, the RNC selects one of the codes and notifies the base station and the user equipment of the corresponding code group number, thereby reducing the signaling load.
  • Step 3 When the base station transmits the broadcast service, the related broadcast service data is formed into a broadcast service signal according to the scrambling code and the midamble code allocated by the R C, and the broadcast service signal is sent by using the service resource allocated by the RNC;
  • Step 4 The user equipment receives the resource according to the resource allocation information sent by the RNC.
  • the user equipment receives the signal sent by multiple cells.
  • the user equipment performs channel estimation according to the specified midamble code, obtains total channel conditions of multiple cells to the user equipment, and then despreads the data according to the channel estimation result. After despreading, the specified scrambling code is used for descrambling, and the required broadcast service data is obtained. .
  • the existing E-MBMS transmission method has greatly improved the traditional MBMS transmission technology, but there are still some unresolved defects.
  • For adjacent sectors in the SFN network there is a high probability of rapid fading of the signal in the adjacent edge of the sector.
  • This phenomenon refers to when the same signal is sent at two base stations, if the signal arrives at the user terminal for reception. The time of the machine is the same and the phase is completely reversed. The energy of the received signal will be completely superimposed in the reverse direction, resulting in a large and rapid attenuation of the received signal, and the signal quality is significantly degraded.
  • This phenomenon is more pronounced in the adjacent edges of adjacent sectors in the same cell, since the channel environments of adjacent edge zones of adjacent sectors are very similar.
  • FIG. 3 An example is shown in Figure 3: between adjacent sectors in the same cell, such as sector 1 and 0, 1 and 2, 0 and 2, since the two sectors are co-sited, two sectors The channel environments in adjacent edge zones are very similar. The traffic signals sent by two base stations in adjacent sectors are likely to reach the edge zones of two adjacent sectors at the same time. The fading characteristics of the signals are similar, so the two come from The probability of the traffic signals of adjacent sectors appearing in the same direction and opposite direction is very large. When the two signals are reversed, the energy of the two signals arriving at the user terminal will be completely superimposed in the reverse direction, resulting in a large and fast receiving signal. Attenuation, signal quality is significantly reduced, and the simulation results further illustrate this trend. Summary of the invention
  • the present invention provides a method, system and device for transmitting broadcast service data in an intra-frequency network, The phenomenon of rapidly attenuating the received signal appearing in the adjacent edge regions of adjacent sectors in the same cell in the same frequency network in the prior art is eliminated.
  • the present invention provides a method for transmitting broadcast service data in an intra-frequency network, where the same-frequency network includes a radio network controller and one or more base stations, and each cell of the base station includes more than one sector, and the method includes the following steps:
  • the radio network controller sends the broadcast service data and the first transmission time to the base station;
  • the base station sends the broadcast service data to each sector included in the first transmission time after the start of the first transmission time, and the transmission time of sending the broadcast service data to the adjacent sector is different.
  • the method further includes:
  • the sectors are grouped in advance, and adjacent sectors in the same cell are grouped into different groups, and each group of sectors corresponds to a different delay unit.
  • step B includes:
  • the base station calculates, according to the first sending time and a delay unit corresponding to each sector that it includes, a second sending time for sending broadcast service data in each sector, and the second sending time corresponding to each sector is And summing the first transmission time to a delay unit corresponding to the sector, and transmitting the broadcast service data to the sector according to a second transmission time corresponding to each sector.
  • the delay unit is set according to whether the main path of the broadcast service data sent by the base station falls within the multipath receiving window of the user terminal.
  • the delay unit is less than or equal to the size of the multipath receiving window of the user terminal minus the path delay used to transmit the broadcast service data.
  • a system for transmitting broadcast service data in an intra-frequency network comprising:
  • a radio network controller configured to send the broadcast service data and the first transmission time to the base station, where the base station is configured to send the broadcast service data to each sector included in the first transmission time after the start of the first transmission time, and The transmission time of the adjacent sector transmitting the broadcast service data is different.
  • the base station is configured to save a delay unit corresponding to a sector that is included by itself, and a delay unit corresponding to the adjacent sector is different; according to the first sending time and a delay corresponding to each sector included in the base station
  • the unit calculates a second transmission time for transmitting broadcast service data in each sector, corresponding to each sector
  • the second transmission time is a sum of the first transmission time and a delay unit corresponding to the sector, and the broadcast service data is sent to the sector according to a second transmission time corresponding to each sector.
  • the delay unit is less than or equal to the size of the multipath receiving window of the user terminal minus the path delay used to transmit the broadcast service data.
  • a base station is connected to a radio network controller, where the base station includes:
  • a time determining unit configured to determine, according to a first sending time from the radio network controller, a sending time of transmitting broadcast service data to each sector included in the self, and sending the sending time of the broadcast service data to the adjacent sector
  • a sending unit configured to send the broadcast service data to each corresponding sector at the determined sending time.
  • the time determining unit includes:
  • a saving unit configured to save a first transmission time sent by the radio network controller and a delay unit corresponding to each sector included in the radio network controller, and a delay unit corresponding to the adjacent sector is different;
  • a calculating unit configured to calculate, according to the first sending time sent by the radio network controller and a delay unit corresponding to each sector, a second sending time for sending broadcast service data in each sector, each fan
  • the second transmission time corresponding to the area is the sum of the first transmission time and the delay unit corresponding to the sector.
  • the delay unit is less than or equal to the size of the multipath receiving window of the user terminal minus the path delay used to transmit the broadcast service data.
  • the base station transmits broadcast service data to each sector included in the self after the first transmission time allocated by the RNC, and transmits the broadcast service to the adjacent sector of the co-site.
  • the transmission time of the data is different, that is, a method of introducing different delay units by the time when the adjacent sector transmits the broadcast service data in the same cell, thereby avoiding the reception signals appearing in the adjacent edge regions of the adjacent sectors in the same cell.
  • the phenomenon of fast attenuation improves the reception performance of signals at the edge of the sector.
  • DRAWINGS 1 is a structural topology diagram of an SFN network in the prior art
  • FIG. 2 is a schematic diagram of data transmission of a broadcast service of a TD-SCDMA system in the prior art
  • FIG. 3 is a schematic diagram of a neighboring cell in an SFN network in the prior art
  • Figure 4 is a flow chart of the method of the present invention.
  • FIG. 5 is a schematic diagram of a grouping table according to an embodiment of the present invention.
  • Figure 6 is a schematic structural view of a system in the present invention.
  • FIG. 7 is a schematic structural diagram of a base station in the present invention. detailed description
  • the present invention provides a method for transmitting broadcast service data in an intra-frequency network.
  • the method implemented by the method is: when transmitting broadcast service data in a neighboring sector in the same-frequency network, through the transmission elbow uniformly allocated in the RNC Different transmission delays are introduced on the basis to eliminate the phenomenon that the received signal is rapidly attenuated due to the broadcast service signal sent by the adjacent sector in the same cell simultaneously reaching the adjacent edge of the sector.
  • the method for transmitting broadcast service data in an intra-frequency network provided by the method is applied to an intra-frequency network, where the same-frequency network includes a radio network controller and one or more base stations, and each cell of the base station includes more than one sector. , the sector co-site in the same cell.
  • the specific process for implementing the method is as follows:
  • Step 401 The RNC sends the broadcast service data and the first sending time to the base station.
  • the RNC After the core network initiates a broadcast service, the RNC is notified by signaling, and the RNC determines which sectors in the same-frequency network transmit the broadcast service, uniformly allocates the same service resources for the sectors, and broadcasts the service data and these.
  • the service resource information is sent to all the base stations and user terminals of the sector that transmits the service, and the service resource information includes at least a first sending time, a sending frequency, a code channel and a scrambling code, and a channel estimation code;
  • the scrambling code and the channel estimation code dedicated to the broadcast service may be stored in a service code group table in advance, and the table is stored in the RNC; the user terminal and the base station, and when the RNC allocates resources for the service, Select one of the codes and notify the base station and the user equipment of the corresponding code group number.
  • the sectors in the same frequency network are grouped, and the same ' ⁇ !, the adjacent sectors in the area are divided into different groups, and each group of sectors corresponds to a different delay unit.
  • the delay unit is set according to whether the main path of the broadcast service data sent by the base station falls within the multipath receiving window of the user terminal, where the value of the delay unit is set to be less than or equal to the size of the multipath receiving window of the user terminal. The value of the path delay used to transmit the broadcast service data is subtracted.
  • the step of implementing the step 402 is: the base station calculates, according to the first sending time and a delay unit corresponding to each sector that it includes, a second sending time for sending broadcast service data in each sector, each sector.
  • Corresponding second sending time is a sum of the first sending time and a delay unit corresponding to the sector, and the broadcast service data is sent to the sector according to a second sending time corresponding to each sector;
  • a packet table may be stored in the base station, the packet table includes more than one packet identifier, a sector identifier, and a delay unit, and one packet identifier corresponds to more than one sector identifier and one delay unit, and each packet The delay unit corresponding to the identifier is different.
  • sector identifiers of adjacent sectors in the same cell correspond to different group identifiers.
  • the identifiers 0, 1, and 2 correspond to the packet identifier 1, the packet identifier 2, and the packet identifier 3, respectively.
  • the sectors 3, 4, and 5 are in different packets, and the sectors 6, 7, and 8 are in different groups, sectors. 9, 10, 11 in different groups, and so on.
  • the packet identifier 1, the packet identifier 2, and the packet label i only correspond to delay units of 0 chips, 4 chips, and 8 chips, respectively.
  • the broadcast service data sent by the RNC is formed into a broadcast service data signal by using the scrambling code and the channel estimation code allocated by the RNC in step 401, and the transmission is allocated according to the determined second transmission time and the RNC in step 402.
  • the user terminal receives the broadcast service data signal on the corresponding resource according to the service resource information sent by the RNC.
  • the user terminal When receiving the broadcast service data signal sent by multiple sectors, the user terminal performs channel estimation according to the channel estimation code specified by the RC, obtains total channel conditions of multiple sectors to the user terminal, and then according to the channel estimation result.
  • the data is despread, and after despreading, the specified scrambling code is used for descrambling, and the required broadcast service data is obtained.
  • the simulation results show that the signal transmission performance based on the present invention is significantly superior to the prior art scheme.
  • the present invention also provides a system for transmitting broadcast service data in an intra-frequency network.
  • the system includes a radio network controller 601 and a base station 602, where the radio network controller 601 is configured to broadcast service data and The first sending time is sent to the base station; the base station 602 is configured to send the broadcast service data to each sector included in the first transmission time after the start of the first transmission time, and send the broadcast service data to the adjacent sector.
  • the sending time is different. .
  • the base station 602 is configured to save a delay unit corresponding to a sector that is included by itself, and a delay unit corresponding to the adjacent sector is different; according to the first sending time and a delay unit corresponding to each sector included in the first transmission time Calculating a second transmission time for transmitting broadcast service data in each sector, where a second transmission time corresponding to each sector is a sum of the first transmission time and a delay unit corresponding to the sector, and according to each fan The second transmission time corresponding to the area transmits the broadcast service data to the sector.
  • the delay unit is less than or equal to the size of the multipath receiving window of the user terminal minus the path delay used to transmit the broadcast service data.
  • the present invention further provides a base station, which can be applied to a system for transmitting broadcast service data in an intra-frequency network, and is connected to a radio network controller.
  • the base station includes a time determining unit 701 and a sending unit 702, where a time determining unit 701, configured to determine, according to a first sending time from the radio network controller, a sending time of transmitting broadcast service data to each sector included in the radio network controller, and send the broadcast service data to the adjacent sector.
  • the sending time is different.
  • the sending unit 702 is configured to send the broadcast service data to each corresponding sector at the determined sending time.
  • the time determining unit 701 includes a saving unit 7011 and a calculating unit 7012, where the saving unit 7011, configured to save a first transmission time sent by the radio network controller and a delay unit corresponding to each sector that is included by the radio network controller, where a delay unit corresponding to the adjacent sector is different; and a calculating unit 7012, configured to: Calculating, according to the first sending time sent by the radio network controller and the delay unit corresponding to each sector, a second sending time for transmitting broadcast service data in each sector, and a second corresponding to each sector
  • the transmission time is the sum of the delay units corresponding to the first transmission time and the sector.
  • the delay unit is less than or equal to the size of the multipath receiving window of the user terminal minus the path delay used to transmit the broadcast service data.

Landscapes

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

Description

一种同频网络中发送广播业务数据的方法、 系统及基站 技术领域
本发明涉及无线通信技术领域， 尤其涉及一种同频网络中发送广播业务 数据的方法、 系统及基站。 背景技术
随着移动通信和英特网的迅速发展， 大量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， 多个用户需要同时接收相同的数据。 这些移动多媒体业务和一般数据相比， 有数据量大、 持续时间长等特点。 为了有效地利用移动网络资源， 第三代移 动通信标准化伙伴项目 （ 3rd Generation Partnership Project, 3 GPP )组织提出 了广播和组播业务 ( Multimedia Broadcast I Multicast Service, MBMS )。 MBMS 指一个数据源向多个用户发送数据的点到多点业务， 实现网络资源共享， 包 括移动核心网和接入网资源共享， 尤其是空口资源。 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。
在原有的 3GPP 的第六版本中， MBMS 频谱效率较低， 通常只有 0.2 ~ 0.02bit/Hz/s, 因此 3GPP在长期演进（Long Term Evolution, LTE ) 架构中开 始了对改进的多媒体广播和組播业务 （Enhanced Multimedia Broadcast I Multicast Service, E-MBMS ) 的研究， 在 E-MBMS中引入了现有的工业地面 广播标准中的同频网络 ( Single Frequency Network, SFN )传输技术。
SFN传输技术， 是指 SFN网络中的所有小区在相同的时间、 利用完全相 同的物理资源，如频率、码道、扰码和信道估计码等，发送完全相同的 MBMS 业务， 这样即使在小区边缘地带， 用户终端也可以接收到来自不同小区的有 用信号， 用户终端不仅可以对接收到的所用有用信号直接在空口进行能量合 并， 并且还可以获得来自于不同路径的分集增益。 图 1所示为一种 SFN网络 结构拓朴图， 该网络中每个小区由三扇区组成并且三扇区共站址， 即这三个 扇区的基站站址相同， 下面以该网絡结构为例说明目前在 3GPP的 E-MBMS 中 SFN传输技术的具体实现方案： 当核心网发起一个广播业务时， 无线网络 控制器（ Radio Network Control, RNC )为该 SFN网络中的所有扇区统一分配 完全相同的广播业务所使用的时间资源、 频率资源和扰码、 信道估计码， 小 区中的用户终端也将使用所述时间资源、 频率资源和扰码、 信道估计码来接 收该广播业务， 也就是说对用户终端来说， 只要是来自 SFN网络中的扇区信 号落入到用户终端多径接收机的窗口内， 用户终端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业务的接收性能。
以上述 SFN传输技术中的资源分配和实现方法为基础， 下面说明现有的 基于时分同步码分多址 （TD-SCDMA ) 系统的 SFN网络中 E- MBMS传输的 实现方法， 参见图 2， 当核心网发起一个广播业务并在多个扇区中传输该广播 业务时， RNC为这多个扇区的基站统一分配相同的广播业务资源， 该业务资 源包括发送时间、 发送频率和该广播业务使用的扰码和信道估计（midamble ) 码， 并将该业务资源信息通过信令告知各基站（Node B )和用户终端； 各扇 区的基站根据这些特定码将广播业务数据组成广播业务信号， 并使用 RNC分 配的业务资源发送该广播业务信号； 用户终端在相应资源位置接收到多个小 区同时发送的相同广播业务信号后， 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， 就可获得所要的广播业务数据。 主要步骤 如下：
步骤 1: 核心网发起一个广播业务， 通过信令通知 RNC, RNC确定在哪 些扇区中进行传输；
步驟 2: R C为这些扇区的基站统一分配相同的广播业务资源， 包括相 同的发送时间、发送频率、发送码道和该广播业务使用的扰码和 midamble码； 这里指定的码是与现有非广播业务采用的扰码和 midamble码不同的码。 可以事先为广播业务找到一组与现有扰码和 midamble码相关性较好的码， 专 门用于广播业务的扰码和 midamble码， 形成一个广播业务码组表， 并保存在 RNC、 用户终端和基站中， RNC在为某个广播业务分配资源时， 选定其中一 对码并将相应的码组号码通知基站和用户设备， 这样可以减少信令负荷。
步驟 3: 基站传输该广播业务时， 按照 R C分配的扰码、 midamble码将 相关的广播业务数据组成广播业务信号， 并使用 RNC分配的业务资源发送该 广播业务信号；
步骤 4: 用户设备根据 RNC发送的资源分配信息， 在相应的资源上进行 接收。 用户设备会接收到多个小区发送下来的信号， 此时用户设备根据指定 的 midamble码进行信道估计， 获得多个小区到用户设备的总的信道条件， 然 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业务数据。 .
现有的 E-MBMS传输方法对传统的 MBMS传输技术有极大的改善， 但是 仍旧存在着一些没有解决的缺陷。 对于 SFN网络中的相邻扇区， 在扇区的相 邻边缘地带极有可能出现信号的快速衰落现象， 这种现象指的是当在两个基 站发送相同的信号 , 如果信号到达用户终端接收机的时间相同并且相位是完 全反向的， 接收信号的能量会完全进行反向叠加， 造成接收信号大幅度快速 衰减， 信号质量显著降^ ί氐。 这种现象在同一个小区中相邻扇区的相邻边缘地 带更加明显， 这是由于相邻扇区的相邻边缘地带的信道环境极为相似。 举例 如图 3所示： 在同一个小区中的相邻扇区之间， 例如扇区 1和 0, 1和 2, 0 和 2，由于两个扇区是共站址的，两个扇区相邻边缘地带的信道环境极为相似， 相邻扇区的两个基站发出的业务信号很有可能同时到达两个相邻扇区的边缘 地带， 该信号的衰落特性也比较相似， 因此两个来自相邻扇区的业务信号出 现同向和反向的几率很大， 当这两个信号反向时， 到达用户终端的这两个信 号的能量会完全进行反向叠加， 造成接收信号大幅度快速衰减， 信号质量显 著降低， 仿真结果也进一步说明了这种趋势。 发明内容
本发明提供一种同频网络中发送广播业务数据的方法、 系统及装置， 用 以消除现有技术中在同频网络中同一小区中相邻扇区的相邻边缘地带出现的 接收信号快速衰减的现象。
本发明提供一种同频网络中发送广播业务数据的方法， 所述同频网絡包 括无线网络控制器和一个以上的基站， 每个基站的小区包括一个以上的扇区， 该方法包括以下步驟：
A. 所述无线网络控制器将广播业务数据和第一发送时间发送给基站；
B. 所述基站在所述第一发送时间开始后向自身包含的每个扇区发送所述 广播业务数据， 并且向相邻扇区发送所述广播业务数据的发送时间不同。
该方法进一步包括：
预先将所述扇区进行分组， 同一小区中的相邻扇区分在不同组中， 每组 扇区对应一个不同的延时单位，
则步骤 B包括：
所述基站根据所述第一发送时间和自身包含的每个扇区对应的延时单位 计算在每个扇区发送广播业务数据的第二发送时间 , 每个扇区对应的第二发 送时间为所述第一发送时间与该扇区对应的延时单位之和， 并按照每个扇区 对应的第二发送时间向该扇区发送所述广播业务数据。
所述延时单位是根据所述基站发送的广播业务数据的主径能否落入用户 终端的多径接收窗内来设置。
所述延时单位小于或等于所述用户终端的多径接收窗的大小减去传输所 述广播业务数据所用的路径时延。
一种同频网络中发送广播业务数据的系统， 该系统包括：
无线网络控制器， 用于将广播业务数据和第一发送时间发送给基站； 基站， 用于在所述笫一发送时间开始后向自身包含的每个扇区发送所述 广播业务数据， 并且向相邻扇区发送所述广播业务数据的发送时间不同。
所述基站， 用于保存自身包括的扇区所对应的延时单位, 相邻扇区所对 应的延时单位不同； 根据所述第一发送时间和自身包含的每个扇区对应的延 时单位计算在每个扇区发送广播业务数据的第二发送时间， 每个扇区对应的 第二发送时间为所述第一发送时间与该扇区对应的延时单位之和， 并按照每 个扇区对应的第二发送时间向该扇区发送所述广播业务数据。
所述延时单位小于或等于用户终端的多径接收窗的大小減去传输广播业 务数据所用的路径时延。
一种基站， 与无线网络控制器相连， 所述基站包括：
时间确定单元， 用于根据来自无线网络控制器的第一发送时间确定向自 身包含的每个扇区发送广播业务数据的发送时间， 并且， 向相邻扇区发送所 述广播业务数据的发送时间不同；
发送单元， 用于在所确定的发送时间， 向对应的每个扇区发送所述广播 业务数据。
所述时间确定单元包括：
保存单元， 用于保存所述无线网络控制器发来的第一发送时间和自身包 含的每个扇区对应的延时单位， 相邻扇区所对应的延时单位不同；
计算单元， 用于根据所述无线网络控制器发来的第一发送时间和所述每 个扇区对应的延时单位计算在每个扇区发送广播业务数据的第二发送时间， 每个扇区对应的第二发送时间为所述第一发送时间与该扇区对应的延时单位 之和。
所述延时单位小于或等于用户终端的多径接收窗的大小减去传输广播业 务数据所用的路径时延。
与现有技术相比， 本发明中基站在 RNC所分配的第一发送时间开始后向 自身包含的每个扇区发送广播业务数据， 并且向共站址的相邻扇区发送所述 广播业务数据的发送时间不同， 也即通过在同一小区中相邻扇区发送广播业 务数据的时间引入不同延时单位的方法， 避免了在同一小区中相邻扇区的相 邻边缘地带出现的接收信号快速衰减的现象， 从而提高了扇区边缘地带信号 的接收性能。 附图说明 图 1为现有技术中一种 SFN网络的结构拓朴图；
图 2为现有技术中 TD-SCDMA系统广播业务数据传输示意图；
图 3为现有技术中一种 SFN网络中相邻小区的示意图；
图 4为本发明的方法流程图；
图 5为本发明中实施例的分组表示意图；
图 6为本发明中的系统结构示意图；
图 7为本发明中的基站结构示意图。 具体实施方式
本发明提供一种同频网络中发送广播业务数据的方法， 这种方法实现的 原理是： 在同频网络中的相邻扇区发送广播业务数据时， 通过在 RNC统一分 配的发送肘间的基础上引入不同的发送时延， 来消除由于同一小区中相邻扇 区发出的广播业务信号同时到达扇区相邻边缘地带造成的接收信号快速衰减 的现象。
本方法提供的一种同频网络中发送广播业务数据的方法， 应用于同频网 络中， 该同频网络包括无线网络控制器和一个以上的基站， 每个基站的小区 包括一个以上的扇区， 同一小区中的扇区共站址。 参见图 4， 实现本方法的具 体流程如下：
步骤 401 : RNC将广播业务数据和第一发送时间发送给基站；
核心网发起一个广播业务后， 通过信令通知 RNC, RNC确定在同频网络 中的哪些扇区传输该广播业务后， 为这些扇区统一分配完全相同的业务资源， 并将广播业务数据和这些业务资源信息发送给所有传输该业务的扇区的基站 和用户终端， 该业务资源信息至少包括第一发送时间、 发送频率、 码道和扰 码、 信道估计码；
这里可以事先将专门用于该广播业务的扰码和信道估计码保存在一个业 务码组表中， 并将该表保存在 RNC；、 用户终端和基站中， RNC在为该业务分 配资源时， 选定其中一对码并将相应的码组号码通知基站和用户设备， 这样 步驟 402:基站在所述第一发送时间开始后向自身包含的每个扇区发送所 述广播业务数据， 并且向相邻扇区发送所述广播业务数据的发送时间不同； 这里， 可以先将同频网络中的扇区进行分组， 同一'■!、区中相邻扇区分在 不同组中， 每组扇区对应一个不同的延时单位。 该延时单位是根据基站发送 广播业务数据的主径能否落入用户终端的多径接收窗内来设置， 这里将延时 单位的值设置为小于或等于用户终端的多径接收窗的大小减去传输广播业务 数据所用的路径时延的值。
那么， 步骤 402 的实现步驟为： 基站根据所述第一发送时间和自身包含 的每个扇区对应的延时单位计算在每个扇区发送广播业务数据的第二发送时 间， 每个扇区对应的第二发送时间为所述第一发送时间与该扇区对应的延时 单位之和， 并按照每个扇区对应的第二发送时间向该扇区发送所述广播业务 数据；
较佳的， 可以在基站中保存一分组表， 该分组表包括一个以上的分组标 识、 扇区标识和延时单位， 一个分组标识对应一个以上的扇区标识和一个延 时单位， 每个分组标识对应的延时单位不同。 为了保证同一小区中的相邻扇 区不分在同一组中， 在该分组表中， 同一个小区中的相邻扇区的扇区标识对 应不同的分组标识。 以图 3所示的 SFN网络为例， 分好组后的分组表如图 5 所示： 图 3 中在同一小区中的相邻扇区 0、 1、 2在不同的分组中， 即扇区标 识 0、 1、 2分别对应分組标识 1、分组标识 2和分组标识 3 , 同样， 扇区 3、 4、 5在不同的分组中， 扇区 6、 7、 8在不同的分组中， 扇区 9、 10、 11在不同的 分組中，等等。 同时，分组标识 1、分组标识 2和分组标 i只 3分别对应 0码片、 4码片、 8码片的延时单位。
基站发送广播业务数据时， 使用步骤 401中 RNC分配的扰码、 信道估计 码将 RNC发来的广播业务数据组成广播业务数据信号， 根据所确定的第二发 送时间和步骤 402中 RNC分配的发送频率向对应的扇区发送广播业务数据信 步骤 403: 用户终端对接收到的广播业务数据信号进行解码， 获得广播业 务数据；
用户终端根据 RNC发送的业务资源信息， 在相应的资源上接收广播业务 数据信号。 用户终端接收到多个扇区发来的广播业务数据信号时， 根据 R C 指定的信道估计码进行信道估计， 获得多个扇区到本用户终端的总的信道条 件， 然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业务数据。 仿真结果表明， 基于本发明的信号传 输性能明显优于现有技术方案。
本发明还提供一种同频网络中发送广播业务数据的系统， 如图 6所示， 该系统包括无线网络控制器 601和基站 602, 其中， 无线网络控制器 601 , 用 于将广播业务数据和第一发送时间发送给基站； 基站 602, 用于在所述笫一发 送时间开始后向自身包含的每个扇区发送所述广播业务数据， 并且向相邻扇 区发送所述广播业务数据的发送时间不同。 .
基站 602, 用于保存自身包括的扇区所对应的延时单位，相邻扇区所对应 的延时单位不同； 根据所述第一发送时间和自身包含的每个扇区对应的延时 单位计算在每个扇区发送广播业务数据的第二发送时间， 每个扇区对应的第 二发送时间为所述第一发送时间与该扇区对应的延时单位之和， 并按照每个 扇区对应的第二发送时间向该扇区发送所述广播业务数据。 所述延时单位小 于或等于用户终端的多径接收窗的大小减去传输广播业务数据所用的路径时 延。
本发明还提供一种基站 , 可以应用于同频网络中发送广播业务数据的系 统中， 与无线网络控制器相连， 如图 7所示， 所述基站包括时间确定单元 701 和发送单元 702, 其中， 时间确定单元 701 , 用于根据来自无线网络控制器的 第一发送时间确定向自身包含的每个扇区发送广播业务数据的发送时间， 并 且， 向相邻扇区发送所述广播业务数据的发送时间不同； 发送单元 702, 用于 在所确定的发送时间， 向对应的每个扇区发送所述广播业务数据。
时间确定单元 701包括保存单元 7011和计算单元 7012, 其中，保存单元 7011 , 用于保存所述无线网络控制器发来的第一发送时间和自身包含的每个 扇区对应的延时单位， 相邻扇区所对应的延时单位不同； 计算单元 7012, 用 于根据所述无线网络控制器发来的第一发送时间和所述每个扇区对应的延时 单位计算在每个扇区发送广播业务数据的第二发送时间， 每个扇区对应的第 二发送时间为所述第一发送时间与该扇区对应的延时单位之和。 所述延时单 位小于或等于用户终端的多径接收窗的大小减去传输广播业务数据所用的路 径时延。 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、 一种同频网络中发送广播业务数据的方法， 所述同频网络包括无线网 络控制器和一个以上的基站， 每个基站的小区包括一个以上的扇区， 其特征 在于， 该方法包括以下步骤：
A. 所述无线网络控制器将广播业务数据和第一发送时间发送给基站；
B. 所述基站在所述第一发送时间开始后向自身包含的每个扇区发送所述 广播业务数据， 并且向相邻扇区发送所述广播业务数据的发送时间不同。
2、 如权利要求 1所述的方法， 其特征在于， 该方法进一步包括： 预先将所述扇区进行分组， 同一小区中的相邻扇区分在不同组中， 每组 扇区对应一个不同的延时单位 ,
则步骤 B包括：
所述基站根据所述第一发送时间和自身包含的每个扇区对应的延时单位 计算在每个扇区发送广播业务数据的第二发送时间， 每个扇区对应的笫二发 送时间为所述第一发送时间与该扇区对应的延时单位之和， 并按照每个扇区 对应的第二发送时间向该扇区发送所述广播业务数据。
3、 如权利要求 2所述的方法， 其特征在于， 所述延时单位是根据所述基 站发送的广播业务数据的主径能否落入用户终端的多径接收窗内来设置。
4、 如权利要求 3所述的方法， 其特征在于， 所述延时单位小于或等于所 述用户终端的多径接收窗的大小减去传输所述广播业务数据所用的路径时 延。
5、一种同频网络中发送广播业务数据的系统， 其特征在于， 该系统包括： 无线网络控制器， 用于将广播业务数据和第一发送时间发送给基站； 基站， 用于在所述第一发送时间开始后向自身包含的每个扇区发送所述 广播业务数据， 并且向相邻扇区发送所述广播业务数据的发送时间不同。
6、 如权利要求 5所述的系统， 其特征在于， 所述基站， 用于保存自身包 括的扇区所对应的延时单位， 相邻扇区所对应的延时单位不同； 根据所述第 一发送时间和自身包含的每个扇区对应的延时单位计算在每个扇区发送广播 业务数据的第二发送时间， 每个扇区对应的第二发送时间为所述第一发送时 间与该扇区对应的延时单位之和， 并按照每个扇区对应的第二发送时间向该 扇区发送所述广播业务数据。
7、 如权利要求 6所述的系统， 其特征在于， 所述延时单位小于或等于用 户终端的多径接收窗的大小减去传输广播业务数据所用的路径时延。
8、 一种基站， 与无线网络控制器相连， 其特征在于， 所述基站包括： 时间确定单元， 用于根据来自无线网络控制器的第一发送时间确定向自 身包含的每个扇区发送广播业务数据的发送时间， 并且， 向相邻扇区发送所 述广播业务数据的发送时间不同；
发送单元， 用于在所确定的发送时间， 向对应的每个扇区发送所述广播 业务数据。
9、 如权利要求 8所述的基站， 其特征在于， 所述时间确定单元包括： 保存单元， 用于保存所述无线网络控制器发来的第一发送时间和自身包 含的每个扇区对应的延时单位， 相邻扇区所对应的延时单位不同；
计算单元， 用于根据所述无线网络控制器发来的第一发送时间和所述每 个扇区对应的延时单位计算在每个扇区发送广播业务数据的第二发送时间， 每个扇区对应的第二发送时间为所述第一发送时间与该扇区对应的延时单位 之和。
10、 如权利要求 9所述的基站， 其特征在于， 所述延时单位小于或等于 用户终端的多径接收窗的大小减去传输广播业务数据所用的路径时延。
PCT/CN2007/003227 2006-11-20 2007-11-15 A method and system for transmitting broadcast services data over a single frequency network and a base station WO2008061437A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07816833.3A EP2101510B1 (en) 2006-11-20 2007-11-15 A method,system and base station for transmitting broadcast services data over a single frequency network
JP2009536586A JP5089703B2 (ja) 2006-11-20 2007-11-15 単一周波数ネットワークにおけるブロードキャストサービスデータの送信方法、送信システム、基地局
US12/515,675 US8848589B2 (en) 2006-11-20 2007-11-15 Method, system and base station for transmitting broadcast service data in a single frequency network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2006101146538A CN101193332B (zh) 2006-11-20 2006-11-20 一种同频网络中发送广播业务数据的方法、系统及基站
CN200610114653.8 2006-11-20

Publications (1)

Publication Number Publication Date
WO2008061437A1 true WO2008061437A1 (en) 2008-05-29

Family

ID=39429382

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/003227 WO2008061437A1 (en) 2006-11-20 2007-11-15 A method and system for transmitting broadcast services data over a single frequency network and a base station

Country Status (6)

Country Link
US (1) US8848589B2 (zh)
EP (1) EP2101510B1 (zh)
JP (1) JP5089703B2 (zh)
KR (1) KR20090097149A (zh)
CN (1) CN101193332B (zh)
WO (1) WO2008061437A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2352347A1 (en) * 2008-10-31 2011-08-03 NEC Corporation Mobile communication system, core network node, control station, base station, communication method and program

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE513429T1 (de) * 2007-04-17 2011-07-15 Innovative Sonic Ltd Verfahren und vorrichtung zur erhöhung der empfangseffizienz eines multimedia-multicast- rundfunkdienstes in einem drahtlosen kommunikationssystem
WO2010001928A1 (ja) 2008-07-01 2010-01-07 日本電気株式会社 無線通信システムと方法とプログラム並びに基地局装置とマルチセル／マルチキャスト協調制御装置
KR101333975B1 (ko) 2009-06-15 2013-11-27 후지쯔 가부시끼가이샤 무선 통신 시스템, 기지국 장치, 단말기 장치, 및 무선 통신 시스템에서의 무선 통신 방법
CN102123113B (zh) * 2010-01-11 2013-07-03 鼎桥通信技术有限公司 一种高铁小区中公共信道信号的传输方法
JP6730249B2 (ja) * 2017-12-01 2020-07-29 ソフトバンク株式会社 無線装置及び無線システム
JP7227845B2 (ja) 2019-05-14 2023-02-22 株式会社東芝 蒸気弁駆動装置、蒸気弁装置および蒸気タービンプラント
CN112153404B (zh) * 2020-09-23 2022-09-09 北京达佳互联信息技术有限公司 码率调整方法、检测方法、装置、设备及存储介质

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1728871A (zh) * 2004-07-29 2006-02-01 北京三星通信技术研究有限公司 控制数据发送的方法
CN1728865A (zh) * 2004-07-27 2006-02-01 中兴通讯股份有限公司 一种时分同步码分多址系统多小区同覆盖的方法
CN1863355A (zh) * 2006-06-26 2006-11-15 北京天碁科技有限公司 Td－scdma终端及其在同频网络下的小区搜索方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3308835B2 (ja) * 1996-12-06 2002-07-29 株式会社日立製作所 無線通信システム
JP2001285244A (ja) * 2000-03-30 2001-10-12 Matsushita Electric Ind Co Ltd Ｏｆｄｍ送信システム
US7197288B1 (en) * 2002-06-24 2007-03-27 Sprint Spectrum L.P. Method and system of spread spectrum modulation
KR100762669B1 (ko) * 2004-03-15 2007-10-01 삼성전자주식회사 멀티미디어 방송/멀티캐스트 서비스 시스템에서 수신신호의 신호이득을 최대화하는 방법 및 시스템
KR20050118031A (ko) 2004-06-12 2005-12-15 삼성전자주식회사 순환지연 다이버시티를 이용하여 방송 채널을 효율적으로전송하는 장치 및 방법
JP2006217051A (ja) * 2005-02-01 2006-08-17 Hitachi Communication Technologies Ltd 無線通信システム及び無線基地局制御装置
US8948817B2 (en) * 2006-10-05 2015-02-03 Nvidia Corporation Cellular communication system, communication unit and method for broadcast communication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1728865A (zh) * 2004-07-27 2006-02-01 中兴通讯股份有限公司 一种时分同步码分多址系统多小区同覆盖的方法
CN1728871A (zh) * 2004-07-29 2006-02-01 北京三星通信技术研究有限公司 控制数据发送的方法
CN1863355A (zh) * 2006-06-26 2006-11-15 北京天碁科技有限公司 Td－scdma终端及其在同频网络下的小区搜索方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2101510A4 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2352347A1 (en) * 2008-10-31 2011-08-03 NEC Corporation Mobile communication system, core network node, control station, base station, communication method and program
EP2603049A1 (en) * 2008-10-31 2013-06-12 NEC Corporation Control station, base station, core network node, mobile communication system and communication method
EP2352347A4 (en) * 2008-10-31 2013-11-13 Nec Corp MOBILE COMMUNICATION SYSTEM, NETWORK HEART NODE, CONTROL STATION, BASE STATION, COMMUNICATION METHOD, AND PROGRAM
US9113440B2 (en) 2008-10-31 2015-08-18 Nec Corporation Mobile communication system, core network node, control station, base station, communication method and program
US9942727B2 (en) 2008-10-31 2018-04-10 Nec Corporation Mobile communication system, core network node, control station, base station, communication method and program
US10477360B2 (en) 2008-10-31 2019-11-12 Nec Corporation Mobile communication system, core network node, control station, base station, communication method and program

Also Published As

Publication number Publication date
JP2010510699A (ja) 2010-04-02
US20100315984A1 (en) 2010-12-16
EP2101510B1 (en) 2014-12-24
KR20090097149A (ko) 2009-09-15
CN101193332A (zh) 2008-06-04
EP2101510A1 (en) 2009-09-16
CN101193332B (zh) 2011-01-26
EP2101510A4 (en) 2012-12-26
JP5089703B2 (ja) 2012-12-05
US8848589B2 (en) 2014-09-30

Similar Documents

Publication Publication Date Title
WO2008061437A1 (en) A method and system for transmitting broadcast services data over a single frequency network and a base station
JP3830920B2 (ja) マルチキャストマルチメディア放送サービスを提供する符号分割多重接続移動通信システムでのソフトハンドオーバ決定装置及び方法
JP5280483B2 (ja) ブロードキャスト通信用のセルラ通信システム及び方法
US8223689B2 (en) Hierarchical service list
CN101272522B (zh) 单频网络传输多媒体广播/组播业务的方法、系统及基站
US9137779B2 (en) Dedicated carrier configuration method and device and multimedia broadcast multicast service transmission method
JP2012506660A (ja) 無線通信システムにおけるブロードキャスティング通信
JP2013537752A (ja) セルラ通信システム、通信ユニット、並びにブロードキャスト及びユニキャスト通信のための方法
Urie et al. Evolved multimedia broadcast multicast service in LTE: An assessment of system performance under realistic radio network engineering conditions
WO2007104231A1 (fr) Procédé, réseau et appareil de transmission de service de diffusion multimédia/multidiffusion
KR20090075685A (ko) 브로드캐스트 통신을 위한 셀룰라 통신 시스템, 통신 유닛 및 방법
EP2001252A1 (en) Wireless network for a multimedia broadcast multicast service
KR20100118515A (ko) Ｍｂｍｓ 서비스 지원을 위한 제어 시스템
WO2010022556A1 (zh) 一种下行信号的分扇区处理方法及基站
WO2009009946A1 (fr) Procédé pour réaliser un service de diffusion/multidiffusion multimédia amélioré dans une cellule multiporteuse
KR100960205B1 (ko) 공간 다이버시티 수신 방법을 이용하여 트렁크브로드캐스트 서비스의 기능을 개선하는 방법
Nakamura et al. Wireless P‐MP transmission with multicode assignment algorithm
Holma et al. Multimedia Broadcast Multicast Service (MBMS)

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: 07816833

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2009536586

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 3218/DELNP/2009

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 1020097010347

Country of ref document: KR

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2007816833

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 12515675

Country of ref document: US