WO2011017822A1 - e-MBMS系统中业务量修剪方法及实现该方法的BM-SC - Google Patents

e-MBMS系统中业务量修剪方法及实现该方法的BM-SC Download PDF

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Publication number
WO2011017822A1
WO2011017822A1 PCT/CN2009/000919 CN2009000919W WO2011017822A1 WO 2011017822 A1 WO2011017822 A1 WO 2011017822A1 CN 2009000919 W CN2009000919 W CN 2009000919W WO 2011017822 A1 WO2011017822 A1 WO 2011017822A1
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Prior art keywords
service
multiplexing
abbr
data
multiplexed
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PCT/CN2009/000919
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English (en)
French (fr)
Inventor
陈宇
王河
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上海贝尔股份有限公司
阿尔卡特朗讯
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Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to KR1020127006146A priority Critical patent/KR20120043083A/ko
Priority to US13/389,693 priority patent/US20120140693A1/en
Priority to CN2009801587532A priority patent/CN102396256A/zh
Priority to BR112012002895A priority patent/BR112012002895A2/pt
Priority to JP2012524072A priority patent/JP2013502100A/ja
Priority to RU2012108583/07A priority patent/RU2490824C1/ru
Priority to EP09848152A priority patent/EP2466948A1/en
Priority to PCT/CN2009/000919 priority patent/WO2011017822A1/zh
Publication of WO2011017822A1 publication Critical patent/WO2011017822A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1881Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with schedule organisation, e.g. priority, sequence management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18Service support devices; Network management devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/40Connection management for selective distribution or broadcast

Definitions

  • the present invention relates to the field of mobile communications, and in particular to packet scheduling and traffic trimming in an evolved multimedia broadcast multicast service system (e-MBMS) that utilizes aggregate bit rate (ABBR) for statistical multiplexing.
  • e-MBMS evolved multimedia broadcast multicast service system
  • ABBR aggregate bit rate
  • MBMS/e-MBMS refers to a point-to-multipoint service in which a data source sends data to multiple users to share network resources.
  • the MBMS/e-MBMS defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service multicast and broadcast, which undoubtedly conforms to the trend of future mobile data development.
  • e-MBMS For e-MBMS, in order to facilitate broadcast multicast single frequency network (MBSFN) operations, all behaviors of the base station (eNB) should be synchronized.
  • the eNB shall send all packets within a specific synchronization period. If the amount of data in the buffer is more than the allocated resources, packet discarding is inevitable.
  • the problem is where and how packet drops are made during scheduling without affecting synchronous MBSFN operations and how to make the system more robust to exceptions.
  • the present invention proposes a centralized packet scheduling and traffic pruning scheme, thereby eliminating the need to standardize the scheduling algorithm at each eNB.
  • a method for traffic pruning in an evolved multimedia broadcast multicast service (e-MBMS) system is provided, the e-MBMS system multiplexing a service usage set bit rate (ABBR), the method includes: a broadcast multicast service center BM-SC in the e-MBMS system determines a multiplexed ABBR; and a multimedia broadcast multicast service coordination entity MCE in the e-MBMS system allocates resources according to the determined ABBR; BM- The SC determines whether the amount of data to be transmitted in the synchronization period exceeds the resource allocated in the same period; and if the judgment result is exceeded, the BM-SC discards the tail data that cannot be transmitted in the synchronization period in the multiplexing service package.
  • a broadcast multicast service center BM-SC in the e-MBMS system determines a multiplexed ABBR
  • MCE multimedia broadcast multicast service coordination entity
  • the method further comprises: before the determining step, the BM-SC actively discards a part of the data packets in the multiplexing service.
  • the part of the data packet occupies at most 1% of all data packets of the multiplexed service plus a margin.
  • the margin accounts for 0.1% of all data packets of the multiplexing service.
  • the base station eNB in the e-MBMS system further discards the data packet according to a predefined rule.
  • the predefined rules include: discarding data packets of services in the multiplexed service in an order reverse to a transmission order of services in the multiplexed service.
  • a BM-SC in an e-MBMS system adopts ABBR multiplexing for services
  • the BM-SC includes: processing means for determining a multiplexed ABBR; Determining means, determining whether the amount of data to be transmitted in the synchronization period exceeds a resource allocated in the synchronization period according to the determined ABBR; and outputting the stream shaping means configured to discard the multiplexing when the judgment result is exceeded A tail packet that cannot be sent in this synchronization cycle in a service.
  • the BM-SC is configured to: firstly discard a portion of the data packets in the multiplexing service by the output data stream forming device, and then determine by the determining device.
  • the part of the data packet occupies at most 1% of all data packets of the multiplexed service plus a margin.
  • the margin accounts for 0.1% of all data packets of the multiplexing service.
  • an e-MBMS system including the above BM-SC is provided.
  • the e-MBMS system further includes a base station eNB, and the eNB is based on a predefined Rules to further drop packets.
  • the predefined rules include: discarding data packets of services in the multiplexing service in an order reverse to a transmission order of services in the multiplexing service.
  • Figure 1 shows a schematic diagram of an e-MBMS system.
  • Figure 2 shows the statistical characteristics of the CBR service.
  • FIG. 3 shows a flow diagram of a traffic pruning method incorporating active packet dropping and passive packet dropping in accordance with an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the structure of a BM-SC according to an embodiment of the present invention. Detailed Description of the Invention ABBR Reuse Introduction
  • e-MBMS deductive multimedia broadcast multicast service
  • ABBR aggregate bit rate
  • multiple e-MBMS services share the same ABBR.
  • Each e-MBMS service potentially utilizes the entire ABBR.
  • the e-MBMS service sharing ABBR constitutes an ABBR group (bundle).
  • Figure 1 shows a schematic diagram of an e-MBMS system.
  • the e-MBMS system 100 shown in FIG. 1 includes one or more encoders 101-1, 10, ..., 101-n, Broadcast Multicast Service Center (BM-SC) 105, Gateway (GW) 110, MBMS Coordination Entity (MCE) 115, and one or more base stations (eNBs) 120.
  • BM-SC Broadcast Multicast Service Center
  • GW Gateway
  • MCE MBMS Coordination Entity
  • eNBs base stations
  • the MCE 115 and the eNB 120 may be in a Radio Access Network (RAN).
  • RAN Radio Access Network
  • the encoders 101-1, 101-2, ..., 101-n receive content from the content provider server, encode it, and provide the encoded content to the BM-SC 105.
  • the BM-SC 105 receives and transmits the encoded e-MBMS content.
  • the BM-SC 105 performs the configuration of statistical multiplexing because the BM-SC 105 can know information about the service combination. For example, in the case of mobile television, the BM-SC 105 can know information about the desired combination of television channels. For example, the BM-SC 105 can know the service area and can know and possibly control the statistical characteristics of the user traffic stream, such as whether the code is a constant bit rate (CBR) or a variable bit rate (VBR), and whether the encoder is MPEG4 or H.264.
  • CBR constant bit rate
  • VBR variable bit rate
  • the BM-SC 105 can be configured to obtain statistical parameters of the service to obtain information about the service combination; and can reuse the service accordingly. Specifically, the BM-SC 105 can set the ABBR for service multiplexing according to the acquired service parameters.
  • the BM-SC 105 can also be configured for rate control coordination between application encoders for streaming traffic so that the encoder can generate VBR traffic, but the aggregate bit rate can be kept constant.
  • the GW 110 establishes an EPS bearer of the service, and transmits related information of the ABBR group to the MCE 115.
  • the MCE 115 allocates resources according to the ABBR information transmitted from the GW 110, and implements multiplexing between different services in the same ABBR group, gp , sharing resources with different businesses. Based on the allocated resources, the eNB 120 ultimately provides the services of interest to the user to the user equipment (UE) (not shown).
  • UE user equipment
  • the services belonging to the same ABBR group share the resources assigned to the group. According to the resource allocation scheme based on the ABBR group, different services are scheduled, g[], for multiplexing. Packet drop
  • a considerable multiplex gain can be achieved by the above multiplexing mechanism.
  • the bit rate of the multiplexing service is still variable.
  • multiplexing is performed within the multicast channel (MCH), while resources are typically allocated to the MCH. Therefore, the multiplexed bit rate may still exceed the allocated bandwidth. Therefore, some numbers need to be discarded in a specific synchronization cycle. According to the package. Therefore, the passive packet discarding function is required.
  • bit rate of the CBR service based on real-time statistics also varies, although this change is much smoother than the VBR service. Therefore, active packet discarding is also required.
  • the BM-SC Since discarding more data is not a good choice, it is assumed here that up to 1% of packets can be dropped during transmission. According to the above discussion, it is necessary to discard the function, and the problem is where to implement the function. Since the traffic is transmitted from the BM-SC and the MBMS function such as the SYNC entity is provided at the BM-SC, the BM-SC is a suitable place to shape the traffic. As you can see from Figure 2, you only need to discard 1% of the packets at most.
  • passive packet dropping is performed in the BM-SC.
  • the BM-SC determines the service multiplexed ABBR and monitors the traffic; the MCE allocates resources according to the required ABBR, and when the traffic exceeds the allocated resources, the BM-SC discards some data packets.
  • active packet dropping is also performed in the BM-SC.
  • the BM-SC actively discards a portion of the data packets in the multiplexed service. This discarding considers, for example, the allocated resources, and also considers the latency requirements for data transmission (eg, packets that are delayed by more than 1 second are discarded). Through simulation, the percentage of discards can be 1%.
  • a margin can be set on a 1% basis, that is, a packet of 1% + ⁇ is discarded. For example, the margin ⁇ can be 0.1%.
  • FIG. 3 shows a flow chart of a traffic pruning method combining passive packet discarding and active packet discarding according to an embodiment of the present invention.
  • ABR average bit rate
  • step 304 the BM-SC shapes (actively discards) the output data stream by discarding the 1% + - fixed amount ⁇ packet. Where ⁇ is, for example, 0.1%.
  • step 305 it is determined whether the amount of data to be transmitted is greater than the resource allocated in the synchronization period. If YES, then in step 306, the tail data packet that cannot be sent in the synchronization period is discarded (passive drop), and then proceeds to step 307, where the data packet is sent; otherwise, the process proceeds directly to the step 307.
  • FIG. 4 is a block diagram showing the structure of a BM-SC according to an embodiment of the present invention.
  • the BM-SC 400 includes: a processing device 405, which can be used to calculate an ABR, and configure an ABBR according to the above (refer to steps 301 to 303 above), and can also be used to perform various components in the BM-SC.
  • a processing device 405 which can be used to calculate an ABR, and configure an ABBR according to the above (refer to steps 301 to 303 above), and can also be used to perform various components in the BM-SC.
  • the buffer 410 is configured to receive and temporarily store the data received from the encoder; and the determining means 415 determines, according to the data stored in the buffer 410, Whether the amount of data transmitted during the synchronization period exceeds the resources allocated by the MCE according to the determined ABBR in the synchronization period; and the output stream shaping means 401 is configured to discard the multiplexing service when the judgment result is exceeded The tail packet sent during this synchronization cycle.
  • the BM-SC 400 can also be configured to: first, a portion of the data packets in the multiplexed service are actively discarded by the output data stream shaping device 401, and then judged by the determining device 415.
  • the traffic is shaped in the upstream node BM-SC of the eNB, so the eNB does not need a complicated distributed discarding function.
  • the packet discarding algorithm in BM-SC is not ideal or MCE wants to save as much resources as possible, sometimes a few packets cannot occur. The situation of sending. Although this is rare, considering the robustness of the system, these anomalies need to be addressed.
  • the eNB For these anomalies, the easiest way is for the eNB to discard packets of a particular service according to predefined rules. For example, such a rule can be: Always discard the last service in the transmission sequence, which has enough data to discard. Because this happens very rarely, it does not affect the QoS of the last service. More generally, in an abnormal situation, the data packets of the service are discarded in the reverse order of the transmission order. In this way, only after all the packets that sacrifice the service (that is, the traffic of the dropped packet) are discarded, will other services be affected.
  • the embodiments described above are for illustrative purposes only and are not intended to limit the scope of the invention. It will be apparent to those skilled in the art that various modifications and changes in the form and details may be made without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

技术领域
本发明涉及移动通信领域, 并且具体的涉及利用集合比特率 ( ABBR) 进行统计复用的演进多媒体广播组播业务系统 (e-MBMS ) 中的包调度和业务量修剪 (trimming)。 背景技术
现今, 随着移动技术的迅猛发展, 大量多媒体业务涌现出来。 其 中一些应用业务, 多个用户能同时接收相同数据, 如视频点播、 电视 广播、 视频会议、 移动电视等。 为了有效地利用移动网络资源,
WCDMA/GSM 全球标准化组织 3GPP 提出了多媒体广播组播业务 ( MBMS ) /演进多媒体广播组播业务 (e-MBMS )。 MBMS/e-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。 3GPP定义的 MBMS/e-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, 这无疑顺 应了未来移动数据发展的趋势。
对于 e-MBMS而言, 为了方便广播组播单频网络 (MBSFN) 操 作, 基站 (eNB ) 的所有行为都应同步。 eNB应当在特定的同步周期 内, 将所有数据包发出。 如果缓冲器中的数据量多于所分配的资源, 那么不可避免需要进行包丢弃。 问题在于在调度期间在何处、 如何来 进行包丢弃而不会影响到同步 MBSFN操作, 以及如何使得系统对于 例外情况更为健壮。
目前, IPwireless在 R2-093737 中提出了一些分布式算法, 具体 地, 提出了三种方案, 它们均基于分布式架构。 这些方案采用传统的 调度算法, 如比例公平调度算法。 因此, 每一 eNB都必须标准化为相 同的调度算法, 以确保同步操作。 在现有技术中, 并没有任何文献公 开了对无线资源管理 (RRM) 算法进行标准化。 发明内容
I 鉴于以上情况, 本发明提出了一种集中式的包调度和业务量修剪 方案, 从而无需在每个 eNB处对调度算法进行标准化。
根据本发明的一个方面, 提供了一种演进多媒体广播组播业务 (e-MBMS ) 系统中业务量修剪的方法, 该 e-MBMS系统对业务釆用 集合比特率 (ABBR) 复用, 该方法包括: 该 e-MBMS系统中的广播 组播业务中心 BM-SC确定复用的 ABBR; 由该 e-MBMS系统中的多 媒体广播组播业务协调实体 MCE根据所确定的 ABBR来分配资源; BM-SC 判断要在同步周期内发送的数据量是否超过在该同歩周期中 所分配的资源; 以及如果判断结果为超过, 则 BM-SC 丢弃复用业务 中不能在该同步周期中发送的尾部数据包。
优选地, 该方法还包括: 在所述判断步骤之前, BM-SC主动丢弃 复用业务中的一部分数据包。
优选地, 所述一部分数据包占复用业务的所有数据包的最多 1% 加上一个余量。 进一步, 所述余量占复用业务的所有数据包的 0.1%。
优选地, 该 e-MBMS系统中的基站 eNB根据预先定义的规则来 进一步丢弃数据包。 进一步, 所述预先定义的规则包括: 按照与复用 业务中业务的传输顺序相反的顺序,来丢弃复用业务中业务的数据包。
根据本发明的另一方面, 提供了一种 e-MBMS系统中的 BM-SC, 该 e-MBMS系统对业务采用 ABBR复用, 所述 BM-SC包括: 处理装 置, 确定复用的 ABBR; 判断装置, 判断要在同步周期内发送的数据 量是否超过根据所确定的 ABBR在该同步周期中所分配的资源; 以及 输出数据流成形装置, 被配置为在判断结果为超过时, 丢弃复用业务 中不能在该同步周期中发送的尾部数据包。
优选地, 该 BM-SC被配置为: 先由所述输出数据流成形装置主 动丢弃复用业务中的一部分数据包,然后再由所述判断装置进行判断。
优选地, 所述一部分数据包占复用业务的所有数据包的最多 1% 加上一个余量。 进一步, 所述余量占复用业务的所有数据包的 0.1%。
根据本发明的再一方面, 提供了一种 e-MBMS 系统, 包括上述 BM-SC。
优选地,该 e-MBMS系统还包括基站 eNB, eNB根据预先定义的 规则来进一步丢弃数据包。 进一步, 所述预先定义的规则包括: 按照 与复用业务中业务的传输顺序相反的顺序, 来丢弃复用业务中业务的 数据包。
根据本发明, 由于在 BM-SC处对包丢弃进行判决, 从而可以避 免对复杂的分布式调度算法进行标准化,因而本发明的实施更为简单, 且无需大幅度变动现有系统结构。 附图说明
下面将参考附图具体描述本发明的优选实施例, 附图中: 图 1示出了一个 e-MBMS系统的示意图。
图 2示出了 CBR业务的统计特性。
图 3示出了根据本发明实施例的结合主动包丢弃和被动包丢弃的 业务量修剪方法的流程图。
图 4示出了根据本发明实施例的 BM-SC的结构框图。 具体实施方式 ABBR复用介绍
在多流传输系统中, 广泛使用统计复用技术。 通过将并行的流进 行复用, 存在可观的复用增益。 增益是由于业务量的统计行为而实现 的, 即, 当其中一个流需要更多带宽时, 将有其他某些流统计地经受 低比特率状态。 统计复用适用于广播系统, 因为利用应用统计特性而 非如物理层反馈之类来实现增益。 复用增益是相当可观的, 例如, 在 DVB-H中, 发现可以实现 30%〜40%的增益。
在演迸多媒体广播组播业务 (e-MBMS ) 系统中, 可以基于集合 比特率 (ABBR) 来进行统计复用。 具体地, 多个 e-MBMS业务共享 相同的 ABBR。 每个 e-MBMS 业务潜在地可利用整个 ABBR。 共享 ABBR的 e-MBMS业务构成 ABBR组 (bundle)。
图 1示出了一个 e-MBMS系统的示意图。
图 1 所示的 e-MBMS系统 100包括一个或多个编码器 101-1、 10 2、 …、 101-n, 广播组播业务中心 (BM-SC ) 105 , 网关 (GW ) 110, MBMS协调实体(MCE) 115, 以及一个或多个基站(eNB ) 120。 其中, MCE 115和 eNB 120可处于无线接入网 (RAN) 中。
编码器 101- 1、 101-2、 …、 101-n从内容供应商服务器接收内容, 并对其进行编码, 并将编码后的内容提供给 BM-SC 105。
BM-SC 105接收并传送编码的 e-MBMS内容。 BM-SC 105进行 统计复用的配置, 因为 BM-SC 105可以知道关于业务组合的信息。例 如, 在移动电视的情况下, BM-SC 105可以知道关于所需电视频道组 合的信息。例如 BM-SC 105可以知道服务区域, 并可以知道且可能控 制用户业务流的统计特性, 例如编码是恒定比特率 (CBR) 还是可变 比特率 (VBR), 编码器是 MPEG4还是 H.264。
例如, BM-SC 105可以配置用于获取业务的统计参数, 从而得到 关于业务组合的信息;并可以据此来对业务进行复用。具体地, BM-SC 105可以根据所获取的业务参数, 为业务复用设置 ABBR。
此外, BM-SC 105还可以配置用于在针对流业务的应用编码器之 间进行速率控制协调, 从而编码器可以生成 VBR 业务流量, 但是集 合比特率可以保持恒定。
GW 110建立业务的 EPS承载, 并将 ABBR组的相关信息传送给 MCE 115 o MCE 115根据从 GW 110传送来的 ABBR信息, 来分配资 源, 实现同一 ABBR组中不同业务之间的复用, gp, 不同业务共享资 源。 根据所分配的资源, eNB 120最终将用户感兴趣的业务提供给用 户设备 (UE) (未示出)。
属于相同 ABBR 组的业务共享分配给该组的资源。 根据基于 ABBR组的资源分配方案来对不同业务进行调度, g[], 进行复用。 包丢弃
通过上述的复用机制, 可以实现相当可观的复用增益。 然而, 复 用业务的比特率仍然是可变的。 同时, 复用是在组播信道 (MCH ) 内 进行的, 而对 MCH通常是固定地分配资源。 因此, 复用比特率仍有 可能超过所分配的带宽。 因而, 需要在特定的同步周期中丢弃一些数 据包。 因此, 需要被动包丢弃功能。
为了在不损害 eNB同步的前提下丢弃数据包,可以存在如下两种 方案: 将分配给 MCH的带宽增加一个安全余量; 或者在溢出或超出 时同步丢弃数据包。 根据仿真发现: 如果允许丢弃 1%的数据包, 则 所需资源将少得多, 而增益仍保持高达 50%。 因此, 关键在于允许丢 弃少量数据。 这对于 VBR和 CBR业务均如此。 图 2示出了 CBR业 务的统计特性, 其中, 丢弃率为 1%, 每 0.5s的周期分配 1.5 X 105bps 的资源。
如图 2所示, 根据实时统计的 CBR业务的比特率也是变化的, 尽管这种变化比 VBR 业务要平滑得多。 因此, 也需要主动包丢弃功 能。
由于丢弃较多数据并非好的选择, 因此在此假设在传输期间最多 可以丢弃 1%的数据包。 根据以上讨论可知, 需要丢弃功能, 问题在 于在何处实现该功能。 由于业务量从 BM-SC传送, 而且在 BM-SC处 具备如 SYNC实体等 MBMS功能, 因此, BM-SC是对业务量进行成 形的合适地点。 从图 2可知, 最多只需要丢弃 1%的数据包。
根据本发明的一个实施例, 在 BM-SC 中进行被动包丢弃。 具体 的, BM-SC确定业务复用的 ABBR, 并监视业务量; MCE根据所需 的 ABBR分配资源, 在业务量超出所分配的资源时, BM-SC将丢弃 一些数据包。
根据本发明的另一实施例, 在 BM-SC 中还进行主动包丢弃。 具 体来说, BM-SC主动丢弃复用业务中的一部分数据包。这种丢弃例如 考虑所分配的资源, 同时还可以考虑数据传输的延时要求 (如延时超 过 1秒的数据包就丢弃)。 通过仿真发现, 丢弃的比例可以为 1%。 另 夕卜, 可在 1%的基础上设置一余量, 即, 丢弃 1%+ε的数据包。 例如, 该余量 ε可以为 0.1%。
进一步, 图 3示出了根据本发明实施例的结合被动包丢弃和主动 包丢弃的业务量修剪方法的流程图。
如图 3所示, 首先, 在步骤 301中, BM-SC计算复用业务的平均 比特率 (ABR)。 然后, 在步骤 302中, BM-SC配置 ABR和编码器, 使得复用组 (bundle ) 输出为 CBR。 在步骤 303 中, BM-SC 配置 ABBR=ABR。通过这三个步骤, BM-SC实现了对复用 ABBR的配置。
然后,在步骤 304中, BM-SC通过丢弃 1%+—定余量 ε的数据包, 来对输出数据流成形 (主动丢弃)。 其中, ε 例如是 0.1%。 然后, 在 步骤 305中,判断待发送的数据量是否大于同步周期中分配到的资源。 如果为 "是", 则在步骤 306中, 丢弃不能在该同步周期中发送的尾部 数据包 (被动丢弃), 然后进行到步骤 307, 在该步骤中发送数据包; 否则, 则直接进行到步骤 307。
因而, 还可以得到一种 BM-SC的设计, 其可以用来实现上述方 法。 图 4示出了根据本发明实施例的 BM-SC的结构框图。
如图 4所示, BM-SC 400包括:处理装置 405,可以用来计算 ABR, 并据此配置 ABBR (可参考上述步骤 301〜303 ), 另外还可以用来对 BM-SC 中各部件进行控制 (图中省略了其与其他部件之间的连接关 系); 缓冲器 410, 用于接收并临时存储从编码器接收到的数据; 判断 装置 415 , 根据缓冲器 410中存储的数据, 判断要在同步周期内发送 的数据量是否超过 MCE根据所确定的 ABBR在该同步周期中所分配 的资源; 以及输出数据流成形装置 401, 被配置为在判断结果为超过 时, 丢弃复用业务中不能在该同步周期中发送的尾部数据包。
进一步, 该 BM-SC 400还可被配置为: 先由输出数据流成形装置 401主动丢弃复用业务中的一部分数据包, 然后再由判断装置 415进 行判断。
这样, 可以避免对公平性、 吞吐量、 优先权等进行考虑的复杂分 布式调度算法进行标准化。 因此, 这种包丢弃对于 RAN 而言是透明 的。 健壮性的进一步改进
在本发明的上述实施例中, 业务量在 eNB的上游节点 BM-SC中 进行成形, 因此 eNB无需复杂的分布式丢弃功能。 但是, 在这种方案 下, 可能存在一些异常情况。 例如, 当从 BM-SC向网关 GW发送数 据时, 一些数据包被延迟到下一同步周期, 因此接下来的同步周期需 要传输过多的数据包。 另外, 例如当 BM-SC和 MCE由不同供应商制 造并因此具有不同算法时, 例如 BM-SC 中的包丢弃算法不理想或者 MCE希望尽可能多地节省资源,有时候会出现少数数据包不能发送的 情况。 尽管这种情况极少出现, 但是考虑到系统的健壮性, 需要对这 些异常情况予以处理。
对于这些异常情况,最简单的方式是由 eNB根据预先定义的规则 将特定业务的数据包丢弃。 例如, 这种规则可以为: 总是丢弃传输顺 序中最后的业务, 该业务有足够的数据可丢弃。 因为这极少发生, 因 此不会影响最后业务的 QoS。 更一般地来说, 在异常情况下, 按照与 传输顺序相反的顺序来丢弃业务的数据包。这样,只有在牺牲业务(即, 被丢弃数据包的业务) 的所有数据包均被丢弃之后, 才会影响到其他 业务。 以上所描述的实施例仅用于示例的目的, 而非要限制本发明的范 围。 本领域技术人员应当理解, 可以对这些实施例进行形式和细节上 的多种修改和改变, 而不脱离本发明的范围和精神。 本发明的范围由 所附权利要求及其等同物限定。

Claims

权 利 要 求
1 . 一种演进多媒体广播组播业务 e-MBMS系统中业务量修剪 的方法, 该 e-MBMS系统对业务采用集合比特率 ABBR复用, 该方法 包括:
该 e-MBMS 系统中的广播组播业务中心 BM-SC 确定复用的 ABBR;
由该 e-MBMS系统中的多媒体广播组播业务协调实体 MCE根据 所确定的 ABBR来分配资源;
BM-SC 判断要在同步周期内发送的数据量是否超过在该同步周 期中所分配的资源; 以及
如果判断结果为超过, 则 BM-SC丢弃复用业务中不能在该同步 周期中发送的尾部数据包。
2. 根据权利要求 1所述的方法, 还包括:
在所述判断步骤之前, BM-SC主动丢弃复用业务中的一部分数据 包。
3. 根据权利要求 2所述的方法, 其中, 所述一部分数据包占复 用业务的所有数据包的最多 1%加上一个余量。
4. 根据权利要求 3所述的方法, 其中, 所述余量占复用业务的 所有数据包的 0.1%。
5. 根据权利要求 1所述的方法, 其中, 该 e-MBMS系统中的 基站 eNB根据预先定义的规则来进一步丢弃数据包。
6. 根据权利要求 5所述的方法, 其中, 所述预先定义的规则包 括: 按照与复用业务中业务的传输顺序相反的顺序, 来丢弃复用业务 中业务的数据包。
7. 一种演进多媒体广播组播业务 e-MBMS系统中的广播组播 业务中心 BM-SC, 该 e-MBMS系统对业务釆用集合比特率 (ABBR) 复用, 所述 BM-SC包括:
处理装置, 确定复用的 ABBR; 判断装置, 判断要在同步周期内发送的数据量是否超过根据所确 定的 ABBR在该同步周期中所分配的资源; 以及
输出数据流成形装置, 被配置为在判断结果为超过时, 丢弃复用 业务中不能在该同步周期中发送的尾部数据包。
8. 根据权利要求 7所述的 BM-SC,其中,该 BM-SC被配置为: 先由所述输出数据流成形装置主动丢弃复用业务中的一部分数据包, 然后再由所述判断装置进行判断。
9. 根据权利要求 8所述的 BM-SC , 其中, 所述一部分数据包 占复用业务的所有数据包的最多 1%加上一个余量。
10. 根据权利要求 9所述的 BM-SC , 其中, 所述余量占复用业 务的所有数据包的 0.1%。
1 1 . 一种演进多媒体广播组播业务 e-MBMS系统, 包括如权利 要求 6〜10中任一项所述的 BM-SC。
12. 根据权利要求 1所述的 e-MBMS系统, 还包括基站 eNB, eNB根据预先定义的规则来进一步丢弃数据包。
13. 根据权利要求 12所述的方法, 其中, 所述预先定义的规则 包括: 按照与复用业务中业务的传输顺序相反的顺序, 来丢弃复用业 务中业务的数据包。
PCT/CN2009/000919 2009-08-11 2009-08-11 e-MBMS系统中业务量修剪方法及实现该方法的BM-SC WO2011017822A1 (zh)

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US13/389,693 US20120140693A1 (en) 2009-08-11 2009-08-11 Method of trimming traffic in an e-mbms system and bm-sc for implementing the method
CN2009801587532A CN102396256A (zh) 2009-08-11 2009-08-11 e-MBMS系统中业务量修剪方法及实现该方法的BM-SC
BR112012002895A BR112012002895A2 (pt) 2009-08-11 2009-08-11 método de adaptar tráfego em um sistema e-mbms e bm-sc para implementar o método
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