WO2012149805A1 - Method and system for improving multicast receiving gain - Google Patents
Method and system for improving multicast receiving gain Download PDFInfo
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- WO2012149805A1 WO2012149805A1 PCT/CN2011/080808 CN2011080808W WO2012149805A1 WO 2012149805 A1 WO2012149805 A1 WO 2012149805A1 CN 2011080808 W CN2011080808 W CN 2011080808W WO 2012149805 A1 WO2012149805 A1 WO 2012149805A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1863—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports
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- the present invention relates to the field of communications technologies, and in particular, to a method and system for improving multicast receiving gain.
- IP There are two ways to communicate with traditional IP: one is point-to-point communication between the source host and the destination host, that is, unicast; the other is point-to-multipoint between the source host and all other hosts in the same network segment. Communication, ie broadcasting. If you want to send information to multiple hosts instead of all hosts, if you use broadcast mode, it will not only send information to unnecessary hosts, but also waste bandwidth or send across network segments. If you use unicast mode, repeat The IP packet not only consumes a lot of bandwidth, but also increases the load on the source host. Therefore, the traditional unicast and broadcast communication methods cannot effectively solve the problem of single-point transmission and multi-point reception.
- Multicast refers to sending a packet to a certain set of nodes (ie, a multicast group) in the form of best-effort transmission in an IP network.
- the basic idea is: The source host (that is, the multicast source) sends only one data.
- the destination address is the multicast group address. All the receivers in the multicast group can receive the same data copy, and only the hosts in the multicast group can receive the data, but other hosts cannot receive the data.
- the multicast technology effectively solves the problem of single-point transmission and multi-point reception, and realizes efficient data transmission from point to multipoint in the IP network, which can save a lot of network bandwidth and reduce network load.
- the significance of multicast is not only here, but more importantly, it can easily provide some new value-added services by using the multicast characteristics of the network, including online live broadcast, network TV, and remote. Education, telemedicine, internet radio, real-time video conferencing, etc. Internet information services.
- the prior art generally uses multicast group separation to improve multicast performance.
- users 1/2/3/4 are the same multicast source, and can be further separated into multicast group 1 (including user 1/2) and multicast group 2 (including user 3/4).
- User multicast data of multicast group 1 is carried on physical resource block 1
- user multicast data of multicast group 2 is carried on physical resource block 2.
- the data carried on the physical resource block 2 is the same as that on the physical resource block 1, the user 1/2 belonging to the multicast group 1 only receives the data carried on the physical resource block 1, and does not use the physical resource block 2 to carry the data. Data to improve reception performance.
- Summary of the invention Embodiments of the present invention provide a method, apparatus, and system that can effectively improve multicast receiving gain. To achieve the above objective, the embodiment of the present invention provides the following technical solutions:
- the embodiment of the invention provides a method for improving multicast receiving gain, which includes:
- the receiving end receives the indication message from the sending end
- the receiving end receives the first physical resource block and the second physical resource block that carry the same data from the same multicast source;
- the receiving end combines the data carried by the first physical resource block and the second physical resource block to improve the multicast receiving gain.
- a system for improving multicast receiving gain which is characterized by comprising:
- a head end configured to distribute upper layer Ethernet data and a convergence terminal, and send an indication message to the terminal
- a coaxial distribution network configured to connect the head end and the terminal
- a terminal configured to receive an indication message from the head end, obtain homogenous multicast group information according to the indication message, and then receive a first physical resource block and a second physical resource block that carry the same data from the same multicast source and The data carried by the first physical resource block and the second physical resource block are combined to improve the multicast receiving gain.
- the receiving end of the embodiment of the present invention can identify and receive the first physical resource block and the second physical resource block that carry the same data from the same multicast source according to the indication message, and utilize the second physical resource block. Redundant data to correct erroneous data generated during transmission can significantly improve multicast reception gain and improve user experience. DRAWINGS
- FIG. 1 is a schematic diagram of a system architecture of the present invention
- EOC Ethernet Over Cable, a technology for transmitting Ethernet data on a coaxial cable
- OFDM Orthogonal Frequency Division Multiple
- point pairs using OFDM technology.
- the multipoint system also includes a WIMAX (Worldwide Interoperability for Microwave Access) system, an LTE (Long Term Evolution) system, and the like in a wireless communication system.
- WIMAX Worldwide Interoperability for Microwave Access
- LTE Long Term Evolution
- the EOC system of the present invention includes: a head end 11, a terminal 13, a coaxial distribution network 12, and the like.
- the head end 11 is generally placed at the optical node location for distributing the upper layer Ethernet data and the aggregation terminal;
- the terminal 13 is generally placed in the user's home as a home terminal to access the user's computer or the set top box;
- the coaxial distribution network 12 is used to connect the head end 11 and the network of the terminal 13, in addition to the coaxial cable, may also include an active amplifier, an EOC jumper, a branch/distributor, and the like.
- the headend 11 is responsible for allocating physical resource blocks to each terminal 13 in the uplink and downlink directions (PRB, Physical
- the resource block informs the terminal 13 of the uplink and downlink physical resource block information through a specific field such as a bitmap MAP message in each downlink frame.
- the terminal 13 receives the extracted data according to the information indicated by the MAP in the physical resource block to which it belongs.
- the terminal 13 transmits data according to the information indicated by the MAP in the physical resource block to which it belongs.
- the physical resource block indicating the allocation is distinguished by the user identifier (such as the user ID, or the connection ID, etc.).
- the multicast ID is used to identify different multicast groups.
- the MAP message allocates a physical resource block based on the multicast ID. Users who join a multicast group extract the multicast data from the physical resource block to which it belongs based on the multicast ID.
- the main steps of an embodiment of the present invention include:
- Step 21 The head end 11 sends an indication message to the terminal 13, which may be a MAP message or other type of message, and notifies the terminal 13 of the multicast ID 1 and the multicast ID 2 (in this embodiment, two homologous multicast groups are taken as an example for description. It is obvious that more than three multi-homed multicast groups can be a homogenous multicast group. If the terminal 13 already has the multicast ID1 in its multicast table, the headend 11 notifies the terminal 13, by message, to add a new homologous multicast ID2.
- Step 22 The terminal 13 receives the MAP message sent by the head end 11, and obtains the same message according to the MAP message.
- Source multicast group information
- Step 23 The terminal 13 acquires the first physical resource block and the second physical resource block of the downlink multicast data bearer of the multicast ID1 and the multicast ID2, and the MCS used by the first physical resource block and the second physical resource block respectively. (modulation coding method);
- Step 24 The terminal 13 merges the acquired multicast data of the first physical resource block and the second physical resource block, which specifically includes:
- the terminal calculates the combining coefficient of the two branches according to the maximum ratio combining criterion according to the channel estimation results hi and h2 of the first physical resource block of the multicast ID1 and the second physical resource block of the multicast ID2.
- the terminal respectively calculates the maximum likelihood ratio results A1 and A2 of each bit in the resource block of the multicast ID1 and the multicast ID2, where Al is the bit maximum likelihood ratio calculated by the received data of the multicast ID1.
- the set, A2 is a set of maximum likelihood ratios calculated for the received data of the multicast ID2.
- the method further includes:
- Step 231 The terminal 13 determines whether the acquired signal to noise ratio of the data carried in the first physical resource block is greater than a preset value, and if yes, the process ends; otherwise, step 24 is performed.
- the storage medium may be a magnetic disk, an optical disk, or the like.
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Abstract
Provided in an embodiment of the present invention is a method for improving multicast receiving gain, comprising: a receiving terminal receiving an indication message from a transmitting terminal; the receiving terminal obtaining the same-source multicast group information according to the indication message; the receiving terminal receiving a first physical resource block and a second physical resource block from the same multicast source carrying the same data; the receiving terminal combines the data carried by the first physical resource block and the second physical resource block to improve the multicast receiving gain.
Description
提升组播接收增益的方法及*** 技术领域 Method and system for improving multicast receiving gain
本发明涉及通信技术领域， 尤其涉及一种提升组播接收增益的方法及系 统。 The present invention relates to the field of communications technologies, and in particular, to a method and system for improving multicast receiving gain.
背景技术 Background technique
传统的 IP通信有两种方式： 一种是在源主机与目的主机之间点对点的通 信， 即单播； 另一种是在源主机与同一网段中所有其它主机之间点对多点的通 信， 即广播。 如果要将信息发送给多个主机而非所有主机， 若采用广播方式实 现， 不仅会将信息发送给不需要的主机而浪费带宽， 也不能实现跨网段发送； 若采用单播方式实现， 重复的 IP包不仅会占用大量带宽， 也会增加源主机的 负载。 所以， 传统的单播和广播通信方式不能有效地解决单点发送、 多点接收 的问题。 There are two ways to communicate with traditional IP: one is point-to-point communication between the source host and the destination host, that is, unicast; the other is point-to-multipoint between the source host and all other hosts in the same network segment. Communication, ie broadcasting. If you want to send information to multiple hosts instead of all hosts, if you use broadcast mode, it will not only send information to unnecessary hosts, but also waste bandwidth or send across network segments. If you use unicast mode, repeat The IP packet not only consumes a lot of bandwidth, but also increases the load on the source host. Therefore, the traditional unicast and broadcast communication methods cannot effectively solve the problem of single-point transmission and multi-point reception.
组播是指在 IP网络中将数据包以尽力传送的形式发送到某个确定的节点 集合（即组播组）， 其基本思想是： 源主机（即组播源）只发送一份数据， 其 目的地址为组播组地址； 组播组中的所有接收者都可收到同样的数据拷贝， 并 且只有组播组内的主机可以接收该数据， 而其它主机则不能收到。 Multicast refers to sending a packet to a certain set of nodes (ie, a multicast group) in the form of best-effort transmission in an IP network. The basic idea is: The source host (that is, the multicast source) sends only one data. The destination address is the multicast group address. All the receivers in the multicast group can receive the same data copy, and only the hosts in the multicast group can receive the data, but other hosts cannot receive the data.
组播技术有效地解决了单点发送、 多点接收的问题， 实现了 IP网络中点 到多点的高效数据传送， 能够大量节约网络带宽、 降低网络负载。 作为一种与 单播和广播并列的通信方式， 组播的意义不仅在于此， 更重要的是， 可以利用 网络的组播特性方便地提供一些新的增值业务， 包括在线直播、 网络电视、 远 程教育、 远程医疗、 网络电台、 实时视频会议等互联网的信息服务领域。 The multicast technology effectively solves the problem of single-point transmission and multi-point reception, and realizes efficient data transmission from point to multipoint in the IP network, which can save a lot of network bandwidth and reduce network load. As a way of communication with unicast and broadcast, the significance of multicast is not only here, but more importantly, it can easily provide some new value-added services by using the multicast characteristics of the network, including online live broadcast, network TV, and remote. Education, telemedicine, internet radio, real-time video conferencing, etc. Internet information services.
现有技术通常采用组播组分离来改善组播性能， 例如用户 1/2/3/4为同一 组播源， 可以进一步分离为组播组 1 (包括用户 1/2 )和组播组 2 (包括用户 3/4 )。 组播组 1的用户组播数据承载在物理资源块 1上， 组播组 2的用户组播 数据承载在物理资源块 2上。 虽然物理资源块 2上承载的数据和物理资源块 1 上的相同，但是属于组播组 1的用户 1/2只会接收物理资源块 1上承载的数据， 不会利用物理资源块 2上承载的数据来改善接收性能。 发明内容
本发明实施例提供了一种能有效提升组播接收增益的方法、 装置及***。 为实现上述目的， 本发明实施例提供如下技术方案： The prior art generally uses multicast group separation to improve multicast performance. For example, users 1/2/3/4 are the same multicast source, and can be further separated into multicast group 1 (including user 1/2) and multicast group 2 (including user 3/4). User multicast data of multicast group 1 is carried on physical resource block 1, and user multicast data of multicast group 2 is carried on physical resource block 2. Although the data carried on the physical resource block 2 is the same as that on the physical resource block 1, the user 1/2 belonging to the multicast group 1 only receives the data carried on the physical resource block 1, and does not use the physical resource block 2 to carry the data. Data to improve reception performance. Summary of the invention Embodiments of the present invention provide a method, apparatus, and system that can effectively improve multicast receiving gain. To achieve the above objective, the embodiment of the present invention provides the following technical solutions:
本发明实施例提供了一种提升组播接收增益的方法， 包括： The embodiment of the invention provides a method for improving multicast receiving gain, which includes:
接收端接收来自发送端的指示消息； The receiving end receives the indication message from the sending end;
接收端根据所述指示消息获得同源组播组信息； Receiving, by the receiving end, the homogenous multicast group information according to the indication message;
接收端接收来自同一组播源承载相同数据的第一物理资源块和第二物理 资源块； The receiving end receives the first physical resource block and the second physical resource block that carry the same data from the same multicast source;
接收端将所述第一物理资源块和第二物理资源块所承载的数据进行合并 处理， 以提升组播接收增益。 The receiving end combines the data carried by the first physical resource block and the second physical resource block to improve the multicast receiving gain.
—种提升组播接收增益的***， 其特征在于， 包括： A system for improving multicast receiving gain, which is characterized by comprising:
头端， 用于分发上层以太网数据和汇聚终端， 并向终端发送指示消息； 同轴分配网， 用于连接头端和终端； a head end, configured to distribute upper layer Ethernet data and a convergence terminal, and send an indication message to the terminal; a coaxial distribution network, configured to connect the head end and the terminal;
终端， 用于接收来自头端的指示消息，根据所述指示消息获得同源组播组 信息，然后接收来自同一组播源承载相同数据的第一物理资源块和第二物理资 源块并将所述第一物理资源块和第二物理资源块所承载的数据进行合并处理， 以提升组播接收增益。 a terminal, configured to receive an indication message from the head end, obtain homogenous multicast group information according to the indication message, and then receive a first physical resource block and a second physical resource block that carry the same data from the same multicast source and The data carried by the first physical resource block and the second physical resource block are combined to improve the multicast receiving gain.
与现有的技术相比，本发明实施例的接收端能够根据指示消息识别并接收 来自同一组播源承载相同数据的第一物理资源块和第二物理资源块，利用第二 物理资源块的冗余数据来修正传输过程中产生的错误数据，可以显著提升组播 接收增益， 改善用户体验。 附图说明 Compared with the prior art, the receiving end of the embodiment of the present invention can identify and receive the first physical resource block and the second physical resource block that carry the same data from the same multicast source according to the indication message, and utilize the second physical resource block. Redundant data to correct erroneous data generated during transmission can significantly improve multicast reception gain and improve user experience. DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施 例中所需要使用的附图作筒单地介绍，显而易见地， 下面描述中的附图仅仅是 本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的 前提下， 还可以根据这些附图获得其他的附图。 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only the present invention. In some embodiments, other drawings may be obtained from those of ordinary skill in the art in light of the inventive work.
图 1 为本发明的***架构示意图； 1 is a schematic diagram of a system architecture of the present invention;
图 2 为本发明的方法的流程图。 具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。基于本发明中的实施例， 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。 2 is a flow chart of the method of the present invention. detailed description The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
EOC ( Ethernet Over Cable, 同轴电缆上传输以太网数据的技术统称）是 一种典型的采用 OFDM ( Orthogonal Frequency Division Multiple )技术的点对 多点***， 除此之外， 采用 OFDM技术的点对多点***还包括无线通信*** 中的 WIMAX ( Worldwide Interoperability for Microwave Access , 全球微波互 联接入 ) ***、 LTE ( Long Term Evolution ) ***等。 EOC (Ethernet Over Cable, a technology for transmitting Ethernet data on a coaxial cable) is a typical point-to-multipoint system using OFDM (Orthogonal Frequency Division Multiple) technology. In addition, point pairs using OFDM technology. The multipoint system also includes a WIMAX (Worldwide Interoperability for Microwave Access) system, an LTE (Long Term Evolution) system, and the like in a wireless communication system.
请参阅图 1 , 本发明的 EOC***包括： 头端 11、 终端 13、 同轴分配网 12 等部分。 头端 11一般放在光节点位置， 用于分发上层以太网数据、 汇聚终端； 终端 13—般放在用户家里充当家庭终端以接入用户电脑或机顶盒； 同轴分配 网 12用于连接头端 11和终端 13的网络， 除了同轴线缆以外， 还可以包括有 源放大器、 EOC跳接器、 分支 /分配器等设备。 Referring to FIG. 1, the EOC system of the present invention includes: a head end 11, a terminal 13, a coaxial distribution network 12, and the like. The head end 11 is generally placed at the optical node location for distributing the upper layer Ethernet data and the aggregation terminal; the terminal 13 is generally placed in the user's home as a home terminal to access the user's computer or the set top box; the coaxial distribution network 12 is used to connect the head end 11 and the network of the terminal 13, in addition to the coaxial cable, may also include an active amplifier, an EOC jumper, a branch/distributor, and the like.
头端 11负责给每个终端 13在上下行方向分配物理资源块（ PRB, Physical The headend 11 is responsible for allocating physical resource blocks to each terminal 13 in the uplink and downlink directions (PRB, Physical
Resource Block),在每个下行帧通过特定的字段如位图 MAP消息告知终端 13其 上下行的物理资源块信息。 下行方向， 终端 13根据 MAP指示的信息在自己 所属的物理资源块接收提取数据； 上行方向， 终端 13根据 MAP指示的信息 在自己所属的物理资源块发送数据。 The resource block) informs the terminal 13 of the uplink and downlink physical resource block information through a specific field such as a bitmap MAP message in each downlink frame. In the downlink direction, the terminal 13 receives the extracted data according to the information indicated by the MAP in the physical resource block to which it belongs. In the uplink direction, the terminal 13 transmits data according to the information indicated by the MAP in the physical resource block to which it belongs.
在 MAP消息中通过用户标识（如用户 ID, 或连接 ID等） 来区分指示分 配的物理资源块， 在支持组播的 OFDM***中， 采用组播 ID来标识不同的组 播组。 MAP消息中会根据组播 ID分配物理资源块， 加入某一组播组的用户， 会根据所属组播 ID, 从所属的物理资源块中提取出组播数据。 In the MAP message, the physical resource block indicating the allocation is distinguished by the user identifier (such as the user ID, or the connection ID, etc.). In the OFDM system supporting multicast, the multicast ID is used to identify different multicast groups. The MAP message allocates a physical resource block based on the multicast ID. Users who join a multicast group extract the multicast data from the physical resource block to which it belongs based on the multicast ID.
如图 2所示， 本发明的实施例的主要步骤包括： As shown in FIG. 2, the main steps of an embodiment of the present invention include:
步骤 21: 头端 11向终端 13发送指示消息， 可以是 MAP消息或其它类型 的消息， 通知终端 13组播 ID 1和组播 ID2 (本实施例以两个同源组播组为例 进行说明， 显然也可以是 3个以上的多路同源组播组）为同源的组播组。 如果 终端 13在其组播表中已有组播 ID1 , 则头端 11通过消息通知终端 13,增加一 个新的同源组播 ID2。 Step 21: The head end 11 sends an indication message to the terminal 13, which may be a MAP message or other type of message, and notifies the terminal 13 of the multicast ID 1 and the multicast ID 2 (in this embodiment, two homologous multicast groups are taken as an example for description. It is obvious that more than three multi-homed multicast groups can be a homogenous multicast group. If the terminal 13 already has the multicast ID1 in its multicast table, the headend 11 notifies the terminal 13, by message, to add a new homologous multicast ID2.
步骤 22: 终端 13接收头端 11发送的 MAP消息， 根据 MAP消息获得同
源组播组信息， Step 22: The terminal 13 receives the MAP message sent by the head end 11, and obtains the same message according to the MAP message. Source multicast group information,
步骤 23: 终端 13获取所属组播 ID1和组播 ID2的下行组播数据承载的第 一物理资源块和第二物理资源块，以及该第一物理资源块和第二物理资源块分 别采用的 MCS (调制编码方式)； Step 23: The terminal 13 acquires the first physical resource block and the second physical resource block of the downlink multicast data bearer of the multicast ID1 and the multicast ID2, and the MCS used by the first physical resource block and the second physical resource block respectively. (modulation coding method);
步骤 24: 终端 13对获取的承载在第一物理资源块和第二物理资源块的同 源组播数据进行合并， 具体包括： Step 24: The terminal 13 merges the acquired multicast data of the first physical resource block and the second physical resource block, which specifically includes:
( 1 )终端根据组播 ID1的第一物理资源块和组播 ID2的第二物理资源块 的信道估计结果 hi和 h2, 按照最大比合并准则， 计算出两个支路的合并系数 (1) The terminal calculates the combining coefficient of the two branches according to the maximum ratio combining criterion according to the channel estimation results hi and h2 of the first physical resource block of the multicast ID1 and the second physical resource block of the multicast ID2.
(其中 K为常数） ：
(where K is a constant):
( 2 )终端分别计算出组播 IDl和组播 ID2的资源块中的每个比特的最大 似然比结果 Al、 A2, 其中 Al为组播 IDl的接收数据计算出来的比特最大似 然比的集合， A2为组播 ID2的接收数据计算出来的比特最大似然比的集合。 (2) The terminal respectively calculates the maximum likelihood ratio results A1 and A2 of each bit in the resource block of the multicast ID1 and the multicast ID2, where Al is the bit maximum likelihood ratio calculated by the received data of the multicast ID1. The set, A2 is a set of maximum likelihood ratios calculated for the received data of the multicast ID2.
( 3 )最后对两个支路的比特最大似然比分别乘上合并系数后相加， 得到 最终的合并结果 A, 即 A=Al*wl + A2*w2。 (3) Finally, the maximum likelihood ratios of the two branches are multiplied by the combining coefficients and added to obtain the final combined result A, that is, A=Al*wl + A2*w2.
可选的， 在步骤 24之前， 进一步包括： Optionally, before step 24, the method further includes:
步骤 231 : 终端 13判断所获取的承载在第一物理资源块数据的信噪比是否 大于预设值， 如果是则流程结束， 否则执行步骤 24。 Step 231: The terminal 13 determines whether the acquired signal to noise ratio of the data carried in the first physical resource block is greater than a preset value, and if yes, the process ends; otherwise, step 24 is performed.
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程， 是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算 机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。 其中， 所述的存储介质可为磁碟、 光盘等。 A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium, the program When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, or the like.
以上所述， 仅为本发明实施例的具体实施方式， 但本发明实施例的保护范 围并不局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围 内， 可轻易想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本 发明实施例的保护范围应该以权利要求的保护范围为准。
The above is only a specific embodiment of the present invention, but the scope of protection of the embodiments of the present invention is not limited thereto, and any person skilled in the art can easily think of it within the technical scope disclosed by the present invention. Variations or substitutions are intended to be covered by the scope of the invention. Therefore, the scope of protection of the embodiments of the present invention should be determined by the scope of the claims.
Claims
1、 一种提升组播接收增益的方法， 包括： 1. A method for improving multicast receiving gain, comprising:
接收端接收来自发送端的指示消息； The receiving end receives the indication message from the sending end;
接收端根据所述指示消息获得同源组播组信息； Receiving, by the receiving end, the homogenous multicast group information according to the indication message;
接收端接收来自同一组播源承载相同数据的第一物理资源块和第二物理 资源块； The receiving end receives the first physical resource block and the second physical resource block that carry the same data from the same multicast source;
接收端将所述第一物理资源块和第二物理资源块所承载的数据进行合并 处理， 以提升组播接收增益。 The receiving end combines the data carried by the first physical resource block and the second physical resource block to improve the multicast receiving gain.
2、 根据权利要求 1所述的方法， 其特征在于： 所述指示消息为位图消息。 2. The method according to claim 1, wherein: the indication message is a bitmap message.
3、 根据权利要求 1所述的方法， 其特征在于， 在所述接收端将所述第一 物理资源块和第二物理资源块所承载的数据进行合并处理之前， 还包括： The method according to claim 1, wherein before the receiving end combines the data carried by the first physical resource block and the second physical resource block, the method further includes:
判断所获取的承载在第一物理资源块数据的信噪比是否大于预设值，如果 是则流程结束， 否则执行下一步。 It is determined whether the obtained signal-to-noise ratio of the data carried in the first physical resource block is greater than a preset value, and if yes, the process ends, otherwise the next step is performed.
4、 根据权利要求 1所述的方法， 其特征在于， 所述接收端将所述第一物 理资源块和第二物理资源块所^载的数据进行合并处理具体包括以下步骤： The method according to claim 1, wherein the receiving end combines the data carried by the first physical resource block and the second physical resource block to specifically process the following steps:
( 1 )接收端根据第一物理资源块和第二物理资源块的信道估计结果 hi 和 h2, 按照最大比合并准则， 计算出两个支路的合并系数（其中 K为常数）： 
(1) The receiving end calculates the combining coefficients of the two branches (where K is a constant) according to the maximum ratio combining criterion according to the channel estimation results hi and h2 of the first physical resource block and the second physical resource block:
( 2 )接收端分别计算出第一物理资源块和第二物理资源块中的每个比特 的最大似然比结果 Al、 Α2, 其中 A1为组播 ID1的接收数据计算出来的比特 最大似然比的集合， Α2为组播 ID2的接收数据计算出来的比特最大似然比的 集合； (2) The receiving end respectively calculates the maximum likelihood ratio results A1 and Α2 of each bit in the first physical resource block and the second physical resource block, where A1 is the maximum likelihood of the bit calculated by the received data of the multicast ID1. a set of ratios, Α2 is a set of maximum likelihood ratios calculated for the received data of the multicast ID2;
( 3 )对两个支路的比特最大似然比分别乘上合并系数后相加， 得到最终 的合并结果 Α, 即 A=Al*wl + A2*w2。 (3) The maximum likelihood ratios of the two branches are multiplied by the combining coefficients and added to obtain the final combined result Α, that is, A=Al*wl + A2*w2.
5、 一种提升组播接收增益的***， 其特征在于， 包括： A system for improving multicast receiving gain, comprising:
头端， 用于分发上层以太网数据和汇聚终端， 并向终端发送指示消息； 同轴分配网， 用于连接头端和终端； a head end, configured to distribute upper layer Ethernet data and a convergence terminal, and send an indication message to the terminal; a coaxial distribution network, configured to connect the head end and the terminal;
终端， 用于接收来自头端的指示消息，根据所述指示消息获得同源组播组 信息，然后接收来自同一组播源承载相同数据的第一物理资源块和第二物理资 源块并将所述第一物理资源块和第二物理资源块所承载的数据进行合并处理， 以提升组播接收增益。 a terminal, configured to receive an indication message from the head end, and obtain a homogenous multicast group according to the indication message And then receiving the first physical resource block and the second physical resource block carrying the same data from the same multicast source, and combining the data carried by the first physical resource block and the second physical resource block to improve the group Broadcast reception gain.
6、 根据权利要求 5所述的***， 其特征在于： 所述指示消息为 MAP消 6. The system according to claim 5, wherein: the indication message is MAP elimination.
7、 根据权利要求 5所述的***， 其特征在于， 所述终端进一步用于： 在 将所述第一物理资源块和第二物理资源块所承载的数据进行合并处理之前，判 断所获取的承载在第一物理资源块数据的信噪比是否大于预设值。 The system according to claim 5, wherein the terminal is further configured to: determine, after the data carried by the first physical resource block and the second physical resource block are combined, Whether the signal to noise ratio of the data carried in the first physical resource block is greater than a preset value.
8、 根据权利要求 5所述的***， 其特征在于， 所述同轴分配网除了同轴 线缆以外， 还包括有源放大器、 EOC跳接器、 分支 /分配器等设备。 8. The system according to claim 5, wherein the coaxial distribution network includes an active amplifier, an EOC jumper, a branch/distributor, and the like in addition to the coaxial cable.
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| CN101094433A (en) * | 2006-06-23 | 2007-12-26 | 上海贝尔阿尔卡特股份有限公司 | Method and device for scheduling resource for services of multicast and grouped cast in wireless access network |
| CN101938698A (en) * | 2009-06-29 | 2011-01-05 | 中兴通讯股份有限公司 | Method and device for bearing transmission blocks of multicasting channels |
| CN102098204A (en) * | 2009-12-14 | 2011-06-15 | 中兴通讯股份有限公司 | Method and system for managing multicast resource |
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| KR100762669B1 (en) * | 2004-03-15 | 2007-10-01 | 삼성전자주식회사 | Method and system for soft combining in multimedia broadcast/multicast service system |
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| CN101938698A (en) * | 2009-06-29 | 2011-01-05 | 中兴通讯股份有限公司 | Method and device for bearing transmission blocks of multicasting channels |
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