WO2008151552A1 - Procédé pour réaliser un multiplexage temporel dans un service de diffusion/multidiffusion multimédia (mbms) et son procédé de transmission d'informations - Google Patents

Procédé pour réaliser un multiplexage temporel dans un service de diffusion/multidiffusion multimédia (mbms) et son procédé de transmission d'informations Download PDF

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Publication number
WO2008151552A1
WO2008151552A1 PCT/CN2008/071207 CN2008071207W WO2008151552A1 WO 2008151552 A1 WO2008151552 A1 WO 2008151552A1 CN 2008071207 W CN2008071207 W CN 2008071207W WO 2008151552 A1 WO2008151552 A1 WO 2008151552A1
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Prior art keywords
tdm
mbms service
offset
information
division multiplexing
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PCT/CN2008/071207
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English (en)
French (fr)
Inventor
Jianxun Ai
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Zte Corporation
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Application filed by Zte Corporation filed Critical Zte Corporation
Priority to US12/602,688 priority Critical patent/US8213348B2/en
Priority to KR1020107000346A priority patent/KR101125660B1/ko
Priority to EP08757618.7A priority patent/EP2161946B1/en
Priority to JP2010510639A priority patent/JP5025792B2/ja
Publication of WO2008151552A1 publication Critical patent/WO2008151552A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/30Resource management for broadcast services

Definitions

  • the present invention relates to a third generation mobile communication (3G) system, and more particularly to a method for implementing time division multiplexing of a multimedia broadcast multicast service in a third generation mobile communication (3G) system.
  • Background technique
  • MBMS Multimedia Broadcast Multicast Service
  • 3GPP 3rd Generation Partnership Project
  • MBMS Multimedia Broadcast Multicast Service
  • MBMS defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service broadcast and multicast, providing a variety of rich video, audio and multimedia services, which undoubtedly conforms to future mobile
  • the trend of data development provides better business prospects for the development of 3G.
  • the configuration of the MBMS service radio bearer can use the 7- load type of PTM (point-to-multipoint, also abbreviated PTM or ptm) and PTP (point-to-point, also abbreviated PTP or ptp).
  • PTM point-to-multipoint
  • PTP point-to-point
  • the PTM mode of the MBMS service uses the common logical channel MTCH (MBMS PTM Traffic Channel, MBMS point-to-multipoint traffic channel) to transmit data to all user equipment UEs that are interested in the multicast service or interested in the broadcast service.
  • the UE in the text is generalized. It includes various wireless terminals such as mobile stations (MS) in other wireless communication systems; the MTCH logical channel is mapped to a transport channel FACH (Forward Access Channel), and the physical channel Secondary CCPCH (Secondary Common Control Physical Channel, Secondary public control physical channel, abbreviation SCCPCH) is sent on the wireless interface.
  • the system side RNC Radio Network Controller
  • informs the UE of the configuration information such as the physical channel configured for the MBMS service through the MCCH (MBMS Point-to-Multipoint Control Channel) channel.
  • MCCH MBMS Point-to-Multipoint Control Channel
  • the MBMS related messages sent on the MCCH include: MBMS Access Information, MBMS Common ptm rb Information, MBMS Current Cell ptm rb Information (MBMS current cell point up to Point wireless bearer information), MBMS General Information, MBMS Modified services Information, MBMS Unmodified services Information, etc.
  • a method of sharing physical channel resources by time division multiplexing is defined in a PTM transmission mode.
  • multiple services are mapped to different logical channels MTCH, and different logical channels are mapped to the same or different transport channels FACH.
  • Different transmission channels are mapped to the same or different physical channel SCCPCH.
  • the method defines a set of cells for each service, the set of cells defining the time at which the service occupies the channel.
  • Different services sharing channel resources share channel resources by time division multiplexing.
  • the sharing may be that multiple logical channels are mapped to the same transport channel, or multiple transport channels are mapped to the same physical channel.
  • different services (logical channels) are at different times. Send, only one service is sent at a time. The UE receives different services at different times.
  • the above time division multiplexing method is embodied in the MBSFN TDM Info List cell of the MBMS Current Cell P-t-m rb Information message.
  • the following parameters are defined for each MBMS service of time division multiplexing:
  • this parameter is defined as the repetition period, expressed in ⁇ number of repetition periods. Different services can be configured with different repetition period lengths. This parameter is relatively fixed, that is, configured by the TDM Req parameter of each service. Each service takes up a certain amount of resources in one iteration cycle. Resource allocation is consistent across different repetition periods.
  • TDM Offset this parameter is defined as the starting offset time of an MBMS service occupying channel resources in one repetition period.
  • N is the number of system frames (eg, 10 ms frames) included in one TTI
  • the transmission time interval (Transmission Time Interval) is a transmission time interval of the transmission channel FACH to which the service logical channel MTCH is mapped.
  • the value is an integer multiple of the system frame duration.
  • the CFN is the Connection Frame Number of the system frame.
  • Each 10ms frame transmitted on the FACH channel has a CFN.
  • the value range of the CFN is defined as 0 to 255.
  • (CFN div N) is a divisible expression that means rounding down.
  • the above system frames (frames) may also be referred to as radio frames.
  • the technical problem to be solved by the present invention is to provide a method for implementing time division multiplexing of multimedia broadcast multicast services to solve the problem of how to improve the efficiency and flexibility of resource allocation.
  • the present invention provides a method for implementing time division multiplexing of a multimedia broadcast multicast MBMS service, including:
  • the network side notifies the user equipment of the configuration information of the MBMS service and transmits the channel resource on the channel information that satisfies the configuration information.
  • the configuration information includes time division multiplexing repetition period information, and location information of occupying channel resources and quantity information of occupied channel resources in a time division multiplexing period;
  • the location information of the occupied channel resource refers to the offset information of the transmission time interval of the occupied channel resource in the time division multiplexing period of the MBMS service, where the occupied channel quantity information refers to the MBMS service in the MBMS service.
  • the resource occupancy quantity information is time division multiplexing repetition length information.
  • an MBMS service starts from a transmission time interval corresponding to a start offset time TDM Offset indicating the occupied resource location information, and continuously occupies Number of transmission time intervals of channel resources Indicates, or is, the number of system frames of the channel resources continuously occupied from the system frame corresponding to the TDM Offset.
  • -CFN is the connection frame number of the system frame
  • -N is the length of the transmission time interval of the transport channel carrying the MBMS service, that is, the number of system frames included in one transmission time interval;
  • -TDM Rep is the length information of the repetition period
  • -TDM - Offset is the initial offset time, that is, the location information of the MBMS service occupying resources in a repetition period;
  • -TDM_Length is the number of transmission time intervals of the MBMS service continuously occupied in one repetition period, that is, the quantity information of the channel resources occupied by the MBMS service.
  • the occupied resource location information and the quantity information are represented by a set of time division multiplexing offset bitmaps TDM Offset Bitma, and one bit of the TDM Offset Bitma corresponds to a transmission time interval in a time division multiplexing repetition period, the bit The value indicates whether the MBMS service occupies its corresponding transmission time interval, and the position of the bit in the bit bitmap corresponds to the start offset time TDM Offset of the corresponding transmission time interval in the repetition period.
  • the MBMS service is scheduled to the corresponding system frame according to the following formula. Accordingly, the user equipment also satisfies the following formula. Receiving the MBMS service on a system frame:
  • -CFN is the connection frame number of the system frame
  • -N is the length of the transmission time interval of the transport channel carrying the MBMS service, that is, the number of system frames included in one transmission time interval;
  • -TDM Re is the length information of the repetition period
  • -TDM - Offfset,i represents the offset value of the i-th TTI occupied by the MBMS service in a repetition period, and the value of i is determined by the position of the bit in the TDM Offset Bitma that is set to indicate the value of the occupied state. .
  • the occupied resource location information and the quantity information are represented by a time division multiplexing offset list, where the list includes one or more time division multiplexing offset entries, and the MBMS service is in a time division multiplexing repetition period.
  • the transmission interval corresponding to the value in all the entries in the list.
  • the MBMS service is scheduled to the corresponding system frame according to the following formula. Accordingly, the user equipment also satisfies the following formula. Receiving the MBMS service on a system frame:
  • -CFN is the connection frame number of the system frame
  • -N is the length of the transmission time interval of the transport channel carrying the MBMS service, that is, the number of system frames included in one transmission time interval;
  • -TDM Re is the length information of the repetition period
  • -TDM - Offfset,i represents the value of the i-th entry in the time division multiplexing offset list of the MBMS service.
  • the information about the occupied channel number is, by default, the time when one MBMS service occupies the channel resource in one time division multiplexing period is one transmission time interval.
  • the configuration information is an MBMS current cell point-to-multipoint radio bearer information message through an MBMS point-to-multipoint control channel, or an MBMS common point-to-multipoint radio bearer information cancellation.
  • the MBMS single frequency network time division multiplexing information list cell that is, the MBSFN TDM Info List in the MBMS general information message is sent to the user equipment.
  • the channel resources occupied by the MBMS service with a large transmission rate are greater than or equal to the channel resources occupied by the service with a small rate.
  • the present invention further provides a method for transmitting time division multiplexing information in a multimedia broadcast multicast MBMS service, where the network side adopts a point-to-multipoint bearer mode and transmits MBMS services through time division multiplexing shared channel resources.
  • the configuration information of the MBMS service transmitted to the user equipment includes time division multiplexing repetition period information, location information occupying channel resources in a time division multiplexing period, and quantity information of occupying channel resources in a time division multiplexing period.
  • the radio network controller on the network side notifies the user equipment of the configuration information of the MBMS service through a channel message of the MBMS point-to-multipoint control channel.
  • the user equipment After receiving the configuration information, the user equipment receives the MBMS service on the indicated channel resource.
  • the representation manner of the resource occupation quantity information and the resource occupation location information in the configuration information is one of the following ways:
  • the occupied resource location information is represented by a starting offset time TDM Offset, and the resource occupied quantity information is represented by a time division multiplexing repetition length, that is, a transmission time interval corresponding to an MBMS service from a TDM Offset in a time division multiplexing period Start, the number of transmission time intervals of consecutively occupied channel resources, or the number of system frames of channel resources continuously occupied from the system frame corresponding to the TDM Offset;
  • the occupied resource location information and the quantity information are represented by a set of time division multiplexing offset bitmaps TDM Offset Bitma, and one bit of the TDM Offset Bitma corresponds to a transmission time interval in a time division multiplexing repetition period, and the value of the bit Determining whether the MBMS service occupies its corresponding transmission time interval, and the position of the bit in the bit bitmap corresponds to a start offset time TDM Offset of the transmission time interval in the repetition period.
  • the occupied resource location information and the quantity information are represented by a list of time division multiplexing offsets, the list includes one or more time division multiplexing offset entries, and the MBMS service is divided in one time division In the repetition period, the transmission time interval corresponding to the value in all the entries in the list is occupied.
  • the method according to the present invention improves the resource allocation efficiency and improves the flexibility of resource allocation on the basis of inheriting the existing MBMS TDM time division multiplexing method.
  • FIG. 1 is a flowchart of a method for implementing time division multiplexing of a multimedia broadcast multicast MBMS service according to an embodiment of the present invention. Preferred embodiment of the invention
  • a service in a TDM Rep can only occupy one TTI time starting from its defined TDM Offset, that is, only Those frames that satisfy an offset can be assigned to the service.
  • the service with a large rate obviously needs to occupy more channel resources, and the service with a small rate only needs less channel resources.
  • the two services can only occupy the same number of channel resources, so that resources allocated for a large rate of service may be insufficient, and the rate is small.
  • Business is a waste. If the two services are configured with different time division multiplexing periods, for example, if the TDM Rep is 2 for the service and the TDM Offset is 0, and the TDM Rep is 4 for the service 2 and 1 for the TDM Offset, the service takes up 2 points.
  • the idle resources are not limited due to the limitations of the existing TDM allocation mechanism and method. It is allocated to service 1 or service 2, which causes great waste of channel resources. Based on this, the present invention proposes an improvement to the existing time division multiplexing mechanism to improve the efficiency and effectiveness of time division multiplexing resources.
  • the physical channel resources are shared by time division multiplexing, and the channel resources are efficiently allocated by defining an MBMS service in a TDM Re and occupying the information of the channel resources. .
  • Step 110 When the MBMS service uses the point-to-multipoint bearer mode to share the channel resource transmission service by time division multiplexing, the network side passes the MBMS point.
  • the channel message to the multi-point control channel informs the user equipment of the configuration information of the MBMS service, and sends the MBMS service on the channel resource that satisfies the configuration information;
  • the configuration information includes the time division multiplexing repetition period information, and the channel is occupied in a time division multiplexing period. Location information of the resource, and quantity information of the channel resources occupied in a time division multiplexing period;
  • Step 120 After receiving the configuration information, the user equipment receives the MBMS service on the indicated channel resource.
  • step 110 in the 3G system, physical channel resource transmission is shared by time division multiplexing.
  • the RNC on the network side completes the configuration of the configuration information according to the requirements of the MBMS service, and schedules the service according to the configuration information, and carries the CFN information in the FP frame sent to the base station, and the base station according to the CFN Determine the starting system frame number SFN of the transmission. For the case where only the base station does not have an RNC (in the case where the RNC and the base station are combined), there is no FP frame, and the other processing is the same.
  • the RNC may send time division multiplexing configuration information to the UE through the MCCH channel.
  • the present invention does not limit the specific transmitted channel and the transmitted entity, because in other systems such as LTE, such channels and entities (completed by the NodeB) may change, but the basic scheme of the method of the present invention can also Be applicable.
  • the transmission rate is large.
  • the channel resources occupied by the MBMS service are greater than or equal to the channel resources occupied by the service with a small rate.
  • the MBMS services with different transmission rates can be time-multiplexed with channel resources according to other principles.
  • the cells defined in the time division multiplexing configuration information are shown in Table 1.
  • Cell (Time division multiplexing repeat length) Cell (or parameter).
  • the TDM Rep Length cell includes an MBMS service in a TDM Rep, and continuously uses the repetition length information of the channel resource.
  • the repetition length information is the number of TTIs of channel resources continuously occupied by one MBMS service, that is, within one TDM Re, one MBMS service continuously occupies the repetition defined by the TDM Offset TTI to the TDM Rep Length cell.
  • Channel resources of length TTI time are not limited to one MBMS service, and continuously uses the repetition length information of the channel resource.
  • the repetition length information may also be the number of system frames (ie, radio frames) or other equivalent information of channel resources continuously occupied by one MBMS service, and the number of system frames is an integer multiple of N, for example, when N is 4, Then the number of system frames is 4, 8, 12...
  • the TDM Rep Length cell is an option.
  • an MBMS service occupies channel resources for one time.
  • -N is the length of the transmission time interval of the transport channel carrying the MBMS service, in units of 10 ms frames.
  • -TDM Rep is the length information of the repetition period.
  • -TDM - Offset is the starting offset time, that is, the MBMS service is in a repetition period Location information of resources occupied within.
  • -TDM - Length is the number of transmission time intervals of the MBMS service continuously occupied in one repetition period, that is, the quantity information of the channel resources occupied by the MBMS service.
  • the MBMS service with different repetition periods can also reuse the TTI in a repetition period as long as the TTIs of the two assignments do not conflict.
  • the user equipment receives the MBMS service at a CFN time that satisfies the following formula:
  • the channel resources occupied by service A are: all system frames in the first TTI time; the channel resources occupied by service B are: all system frames in the second and third TTI time .
  • a set of TDM Offset cells is added to the time division multiplexing configuration information in the MBSFN TDM Info List cell of the MBMS Current Cell rb Information message according to the MBMS service requirement.
  • the TDM Offset cell is used to indicate the number and location information of a MBMS service occupying channel resources within a TDM Re. That is, within a TDM Rep, an MBMS service occupies channel resources within the time defined by the TDM Offset cell.
  • the TDM offset cell is defined as a set of TDM Offset Bitmap (cell time division offset bitmap) cells, and the cells defined in the configuration information are shown in Table 2.
  • Table 2 MBSFN TDM Info Lis (addition to the underlined table)
  • each bit of the cell represents a TDM Offset value in the repetition period. If the value of the ith bit of the TDM Offset Bitma of an MBMS service is set to 1 (can also be set to 0, the effect is the same) Then, the radio resource control entity sends the MBMS service in all CFNs that satisfy all the TTI times of formula (1) within one TDM Rep. The user equipment also receives the MBMS service within these CFNs.
  • the TDM_Offfset,i represents the offset value of the i-th TTI occupied by the MBMS service in a repetition period, and the value of i is set to 1 by the TDM Offset Bitma (or other value indicating the occupied state) The position of the bit is determined.
  • TDM Offset Bitmap for service A, set its TDM Offset Bitmap to binary value 000000010, that is, the second bit of the cell is set to 1, and the remaining bits are set to 0; for service B, Set its TDM Offset Bitma to a binary value of 000000101, that is, the first and third bits of the cell are set to 1 and the remaining bits are set to zero.
  • the valid bits in these 9 bits, such as 3 bits, are agreed by the user equipment and the network side.
  • the channel resources occupied by service A are: all 10ms frames in the second TTI time; service B The occupied channel resources are: All 10ms frames in the first and third TTI times.
  • the TDM offset cell may also be defined as a list of TDM Offsets, as shown in Table 3, defining a TDM Offset List cell, the cell containing one Or multiple entries TDM_Offset, whose value is an integer, indicating the location of one or more ports in which a resource is occupied in a TDM Re.
  • an MBMS service occupies channel resources in all CFNs of all TTI times that satisfy the following formula in one TDM Re.
  • the network side includes transmitting the MBMS service on the channel resources, and the user equipment also receives the MBMS service on the channel resources.
  • TDM Offset where is the value of the i-th entry in the TDM Offset List time-division offset list of the service.
  • the value range is shown in Table 3.
  • the optimal resource allocation efficiency can be achieved.
  • the TDM Offset cell is a TDM Offset list
  • the service A set its TDM Offset List to include an entry with a value of 2
  • the service B set its TDM Offset List to include two entries, the values of which are respectively 1, 3
  • the channel resources occupied by service A can also be: all 10ms frames in the second TTI time
  • the channel resources occupied by service B are: all 10ms in the first and third TTI time frame.

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Description

多媒体广播组播业务时分复用的实现方法及信息传输方法
技术领域
本发明涉及第三代移动通讯(3G )系统, 特别涉及第三代移动通讯(3G ) 系统中, 多媒体广播组播业务时分复用的实现方法。 背景技术
随着 Internet的迅猛发展和大屏幕多功能手机的普及,大量移动数据多媒 体业务涌现出来, 各种高带宽多媒体业务不断出现, 如视频会议、 电视广播、 视频点播、 广告、 网上教育、 互动游戏等, 一方面满足移动用户不断上升的 业务需求, 同时也为移动运营商带来新的业务增长点。 这些移动多媒体业务 要求多个用户能够同时接收相同数据, 与一般的数据相比, 具有数据量大、 持续时间长、 时延敏感等特点。
为了有效地利用移动网络资源, 第三代合作伙伴计划(3rd Generation Partnership Project, 简称 3GPP )提出了多媒体广播和组播业务(Multimedia Broadcast Multicast Service , 简称 MBMS ) , 该业务是一种从一个数据源向 多个目标传送数据的技术, 从而实现网络(包括核心网和接入网) 资源的共 享, 提高网络资源 (尤其是空中接口资源) 的利用率。 3GPP定义的 MBMS 不仅能实现纯文本低速率的消息类组播和广播, 而且还能实现高速多媒体业 务的广播和组播, 提供多种丰富的视频、 音频和多媒体业务, 这无疑顺应了 未来移动数据发展的趋势, 为 3G的发展提供更好的业务前景。
MBMS业务无线承载的配置可以釆用 P-T-M(点到多点,也可以简写 PTM 或 ptm )和 P-T-P (点到点, 也可以简写 PTP或 ptp ) 的7 载类型。
MBMS业务的 PTM方式使用公共逻辑信道 MTCH ( MBMS PTM Traffic Channel, MBMS点对多点业务信道)对所有加入组播业务或对广播业务感兴 趣的用户设备 UE发送数据,文中的 UE是广义的, 包括其它无线通信系统中 的移动台 (MS )等各种无线终端; MTCH逻辑信道映射到传输信道 FACH ( Forward Access Channel,前向接入信道 ) ,通过物理信道 Secondary CCPCH ( Secondary Common Control Physical Channel , 次要公共控制物理信道, 简称 SCCPCH )在无线接口发送。 系统侧 RNC (无线网络控制器)通过 MCCH ( MBMS point-to-multipoint Control Channel, MBMS点到多点控制信道)信 道告知 UE有关 MBMS业务配置的物理信道等配置信息。
MCCH 上发送的 MBMS 相关消息包括: MBMS Access Information ( MBMS接入信息) 、 MBMS Common p-t-m rb Information ( MBMS公共点 到多点无线 7 载信息) 、 MBMS Current Cell p-t-m rb Information ( MBMS当 前小区点到多点无线承载信息)、 MBMS General Information ( MBMS一般信 息 )、 MBMS Modified services Information ( MBMS修改业务信息)、 MBMS Unmodified services Information ( MBMS没有修改业务信息)等等。
在现有的 MBMS协议中, 定义了一种 PTM发送方式下, 通过时分复用 来共享物理信道资源的方法。 在该方法中, 多个业务映射到不同的逻辑信道 MTCH, 不同的逻辑信道映射到相同或者不同的传输信道 FACH。 不同的传 输信道映射到相同或不同的物理信道 SCCPCH。 该方法为每个业务定义了一 组信元, 该组信元定义了该业务占用信道的时间。 共享信道资源的不同业务 通过时分复用共享信道资源。 这里所说的共享, 可以是多个逻辑信道映射到 同一个传输信道, 或者多个传输信道映射到同一个物理信道, 在上述的两种 方式中, 不同的业务(逻辑信道)在不同的时间发送, 同一时刻只有一个业 务发送。 UE在不同的时间接收不同的业务。
上述的时分复用方式体现在 MBMS Current Cell P-t-m rb Information消息 的 MBSFN TDM Info List信元中。 在所述信元中, 为时分复用的每个 MBMS 业务, 定义了如下参数:
TDM Rep, 该参数定义为重复周期, 用重复周期包含的 ΤΉ个数表示。 不同的业务可以配置不同的重复周期长度, 这个参数是相对固定配置的, 也 就是通过每个业务的 TDM Req参数进行配置。每个业务在一个重复周期内占 用一定时间的资源。 在不同的重复周期, 资源分配情况是一致的。
TDM Offset,该参数定义为一个 MBMS业务在一个重复周期中占用信道 资源的起始偏移时间。
一个 MBMS业务占用的信道资源定义如下: (CFN div N) mod TDM— Rep = TDM— Offset
其中, N为一个 TTI中包含的系统帧 (如 10ms帧 ) 的个数, 所述 ΤΉ (传输时间间隔, Transmission Time Interval )是业务逻辑信道 MTCH所映射 到的传输信道 FACH的传输时间间隔, 该值为系统帧时长的整数倍。 CFN是 系统帧的连接帧号 ( Connection Frame Number ) , 在 FACH信道上传输的每 个 10ms帧都有一个 CFN, CFN的取值范围定义为 0到 255。 (CFN div N)是 整除算式, 表示向下取整。 上述系统帧 (frames )也可以称为无线帧。
原有协议在某些情况下会造成资源分配困难。 发明内容
本发明要解决的技术问题是提供一种多媒体广播组播业务时分复用的实 现方法, 以解决如何提高资源分配的效率和灵活性的问题。
为了解决上述问题,本发明提供了一种多媒体广播组播 MBMS业务时分 复用的实现方法, 包括:
在 MBMS 业务釆用点到多点承载方式且通过时分复用来共享信道资源 传输业务时, 网络侧将所述 MBMS业务的配置信息告知用户设备并在满足所 述配置信息的信道资源上发送所述 MBMS业务,该配置信息包括时分复用重 复周期信息, 以及在一个时分复用周期内占用信道资源的位置和占用信道资 源的数量信息;
所述用户设备收到所述配置信息后, 在所指示的信道资源上接收所述
MBMS业务。
其中,所述占用信道资源的位置信息是指所述 MBMS业务在一个时分复 用周期内, 所占用信道资源的传输时间间隔的偏移信息, 所述占用信道数量 信息是指所述 MBMS 业务在一个重复周期内占用的信道资源的传输时间间 隔个数或系统帧个数。
其中, 所述资源占用数量信息为时分复用重复长度信息, 用一个时分复 用周期内, 一个 MBMS业务从表示占用资源位置信息的起始偏移时间 TDM Offset对应的传输时间间隔开始, 连续占用的信道资源的传输时间间隔个数 表示,或者是从 TDM Offset对应的系统帧开始连续占用的信道资源的系统帧 个数表示。
如权利要求 3所述的实现方法, 其特征在于, 网络侧在满足所述配置信 息的信道资源上发送所述 MBMS业务时, 按下述公式将 MBMS业务调度到 相应的系统帧上, 相应地, 所述用户设备也在满足下述公式的系统帧上接收 所述 MBMS业务:
(CFN div N) mod TDM— Rep = TDM— Offset + i, i = 0 to TDM— Length - 1 其中:
-CFN为系统帧的连接帧号;
-N为承载 MBMS业务的传输信道的传输时间间隔的长度, 即一个传输 时间间隔包含的系统帧个数;
-(CFN divN)是整除算式, 表示向下取整;
-TDM Rep 为所述重复周期的长度信息;
-TDM— Offset为所述起始偏移时间,即所述 MBMS业务在一个重复周期 内占用资源的位置信息;
-TDM— Length 为所述 MBMS业务在一个重复周期内连续占用的传输时 间间隔的个数信息, 也即所述 MBMS业务占用信道资源的数量信息。
其中,所述占用资源位置信息和数量信息用一组时分复用偏移位图 TDM Offset Bitma 表示,所述 TDM Offset Bitma 的一个比特对应一个时分复用重 复周期内的一个传输时间间隔,该比特的值表示所述 MBMS业务是否占用其 对应的传输时间间隔, 该比特在所述比特位图中的位置与其对应的传输时间 间隔在重复周期内的起始偏移时间 TDM Offset——对应。
其中, 网络侧在满足所述配置信息的信道资源上发送所述 MBMS 业务 时, 按下述公式将 MBMS业务调度到相应的系统帧上, 相应地, 所述用户设 备也在满足下述公式的系统帧上接收所述 MBMS业务:
(CFN div N) mod TDM Rep = TDM— Offset, i
其中: -CFN为系统帧的连接帧号;
-N为承载 MBMS业务的传输信道的传输时间间隔的长度, 即一个传输 时间间隔包含的系统帧个数;
-(CFN divN)是整除算式, 表示向下取整;
-TDM Re 为重复周期的长度信息;
-TDM— Offfset,i表示一个重复周期内的所述 MBMS业务占用的第 i个 TTI 的偏移值, i的取值由 TDM Offset Bitma 中被置为表示占用状态的值的比特 位的位置决定。
其中, 所述占用资源位置信息和数量信息用一个时分复用偏移的列表表 示, 该列表中包括一个或多个时分复用偏移的表项, 所述 MBMS业务在一个 时分复用重复周期内, 占用该列表中所有表项中的值所对应的传输时间间隔。
其中, 网络侧在满足所述配置信息的信道资源上发送所述 MBMS 业务 时, 按下述公式将 MBMS业务调度到相应的系统帧上, 相应地, 所述用户设 备也在满足下述公式的系统帧上接收所述 MBMS业务:
(CFN div N) mod TDM— Rep: TDM— Offset, i
其中:
-CFN为系统帧的连接帧号;
-N为承载 MBMS业务的传输信道的传输时间间隔的长度, 即一个传输 时间间隔包含的系统帧个数;
-(CFN divN)是整除算式, 表示向下取整;
-TDM Re 为重复周期的长度信息;
-TDM— Offfset,i表示所述 MBMS业务的时分复用偏移列表中的第 i个表 项的值。
其中, 所述占用信道数量信息在缺省情况下, 表示在一个时分复用周期 内, 一个 MBMS业务占用信道资源的时间为一个传输时间间隔。
其中, 所述配置信息是通过 MBMS点到多点控制信道的 MBMS当前小 区点到多点无线承载信息消息, 或者 MBMS公共点到多点无线承载信息消 息, 或者 MBMS—般信息消息中的 MBMS单频网时分复用信息列表信元即 MBSFN TDM Info List发送给所述用户设备的。
其中, 为多个 MBMS业务时分复用信道资源时, 在一个时分复用重复周 期内,传输速率大的 MBMS业务占用的信道资源大于等于速率小的业务占用 的信道资源。
为了解决上述问题,本发明还提供了一种多媒体广播组播 MBMS业务中 时分复用信息的传输方法, 网络侧采用点到多点承载方式并通过时分复用共 享信道资源来传输 MBMS业务时, 发送给用户设备的所述 MBMS业务的配 置信息包括时分复用重复周期信息、 在一个时分复用周期内占用信道资源的 位置信息, 以及在一个时分复用周期内占用信道资源的数量信息。
其中,所述网络侧的无线网络控制器通过 MBMS点到多点控制信道的信 道消息将所述 MBMS业务的配置信息告知用户设备。
其中, 所述用户设备收到所述配置信息后, 在所指示的信道资源上接收 所述 MBMS业务。
其中, 所述配置信息中的资源占用数量信息和资源占用位置信息的表示 方式为以下几种方式中的一种:
所述占用资源位置信息用起始偏移时间 TDM Offset表示,所述资源占用 数量信息用时分复用重复长度表示, 即用一个时分复用周期内, 一个 MBMS 业务从 TDM Offset对应的传输时间间隔开始,连续占用的信道资源的传输时 间间隔个数表示,或者是从 TDM Offset对应的系统帧开始连续占用的信道资 源的系统帧个数表示;
所述占用资源位置信息和数量信息用一组时分复用偏移位图 TDM Offset Bitma 表示 ,所述 TDM Offset Bitma 的一个比特对应一个时分复用重复周期 内的一个传输时间间隔,该比特的值表示所述 MBMS业务是否占用其对应的 传输时间间隔, 该比特在所述比特位图中的位置与其对应的传输时间间隔在 重复周期内的起始偏移时间 TDM Offset——对应;
所述占用资源位置信息和数量信息用一个时分复用偏移的列表表示, 该 列表中包括一个或多个时分复用偏移的表项,所述 MBMS业务在一个时分复 用重复周期内, 占用该列表中所有表项中的值所对应的传输时间间隔。
与现有技术相比, 采用本发明所述方法, 在继承使用现有 MBMS TDM 时分复用方法的基础上, 改进了资源分配效率, 提高了资源分配的灵活性。 附图概述
图 1为本发明实施例多媒体广播组播 MBMS业务时分复用的实现方法的 流程图。 本发明的较佳实施方式
现有的方法中, 因为没有定义一个 MBMS业务在一个 TDM Re 内连续 占用信道资源的时间长度,一个业务在一个 TDM Rep内, 只能占用从其定义 的 TDM Offset开始的一个 TTI时间, 即只能将满足一个 offset的那些帧分配 给该业务。
如果两个业务速率不同的业务时分复用同一个信道资源, 速率大的业务 显然需要占用更多的信道资源, 速率小的业务只需要较少的信道资源。 但是 使用上述的方式, 如果两个业务配置相同的时分复用重复周期, 则两个业务 只能占用相同数量的信道资源, 这样, 对速率大的业务分配的资源可能不足, 而对速率小的业务则造成了浪费。而如果两个业务配置不同的时分复用周期, 例如, 业务一配置 TDM Rep为 2, TDM Offset配置为 0, 而业务二配置 TDM Rep为 4, TDM Offset配置为 1 , 则业务一占用二分之一的信道资源, 而业务 二占用四分之一的信道资源, 另有四分之一的信道资源空闲没有被占用, 该 空闲的资源因为现有的 TDM分配机制和方法的限制, 没有办法分配给业务 一或者业务二使用, 而造成信道资源的极大浪费。 基于此, 本发明对现有的 时分复用机制提出改进, 以提高时分复用资源的效率和有效性。
在 3G系统中, 当 MBMS业务釆用 PTM发送方式时, 利用时分复用来 共享物理信道资源 , 进一步通过定义一个 MBMS业务在一个 TDM Re 内 , 占用信道资源数量的信息, 实现信道资源的高效分配。
下面结合几个实施例, 对本发明作详细说明。
第一实施例 本实施例 MBMS业务中实现时分复用的方法包括以下步骤: 步骤 110, 在所述 MBMS业务釆用点到多点承载方式, 通过时分复用来 共享信道资源传输业务时, 网络侧通过 MBMS点到多点控制信道的信道消息 告知用户设备 MBMS业务的配置信息,并在满足上述配置信息的信道资源上 发送 MBMS业务; 配置信息包括时分复用重复周期信息、 在一个时分复用周 期内占用信道资源的位置信息, 以及在一个时分复用周期内占用信道资源的 数量信息;
步骤 120,用户设备收到配置信息后,在所指示的信道资源上接收 MBMS 业务。
对于步骤 110, 在 3G 系统中, 通过时分复用来共享物理信道资源发送
MBMS业务的过程中, 网络侧的 RNC根据 MBMS业务需要, 完成对上述配 置信息的配置, 并根据这些配置信息对业务进行调度,在发送给基站的 FP帧 中携带了 CFN信息, 基站根据 CFN来确定发送的起始系统帧号 SFN。 对只 有基站没有 RNC的情况( RNC和基站合一的情况 ) , 没有 FP帧, 其它处理 都是一样的。
RNC可以通过 MCCH信道向 UE发送时分复用配置信息。不过本发明并 不限定具体发送的信道和发送的实体,因为在其它系统如 LTE等演进系统中, 这些信道和实体(由 NodeB完成)都可能会有变化, 但本发明方法的基本方 案同样可以适用。
MBMS业务时分复用信道资源时, 在一个 TDM Rep内, 传输速率大的
MBMS业务占用的信道资源大于等于速率小的业务占用的信道资源, 当然, 在其它实施例中还可以按其他原则,使传输速率不同的 MBMS业务时分复用 信道资源。
时分复用配置信息中定义的信元见表 1 , 在 MBMS Current Cell p-t-m rb Information ( MBMS当前小区点到多点无线承载信息 ) 消息的 MBSFN TDM Info List ( MBMS单频网时分复用信息列表)信元中,增加了 TDM Rep Length
(时分复用重复长度)信元(或称参数) 。
表 1 MBSFN TDM Info Lis (表中加下划线者为新增)
Figure imgf000011_0001
可以看出, 所述 TDM Rep Length信元包含了一个 MBMS业务在一个 TDM Rep内, 连续占用信道资源的重复长度信息。 所述重复长度信息是一个 MBMS业务连续占用的信道资源的 TTI个数, 即在一个 TDM Re 内 , 一个 MBMS业务连续占用了从第 TDM Offset个 TTI开始, 到 TDM Rep Length信 元所定义的重复长度个 TTI时间的信道资源。
所述重复长度信息还可以是一个 MBMS 业务连续占用的信道资源的系 统帧 (即无线帧)个数或其他等同的信息, 系统帧的个数是 N的整数倍, 如 当 N为 4时, 则系统帧个数是 4、 8、 12...
TDM Rep Length信元是一个可选项, 在缺省情况下, 在一个 TDM Rep 内, 一个 MBMS业务占用信道资源的时间为 1个 ΤΉ。
RNC在满足上述配置信息的信道资源上传输所述 MBMS业务时, 按下 面的公式将 MBMS业务调度到相应的系统帧上:
(CFN div N) mod TDM Rep = TDM— Offset + i, i = 0 to TDM— Length - 1 其中:
-N为承载 MBMS业务的传输信道的传输时间间隔的长度,以 10ms帧的 个数为单位。
-TDM Rep 为所述重复周期的长度信息。
-TDM— Offset为所述起始偏移时间,即所述 MBMS业务在一个重复周期 内占用资源的位置信息。
-TDM— Length 为所述 MBMS业务在一个重复周期内连续占用的的传输 时间间隔的个数信息, 也即所述 MBMS业务占用信道资源的数量信息。
重复周期不同的 MBMS业务也可以复用一个重复周期中的 TTI, 只要两 者分配的 TTI没有冲突即可。
关于步骤 120, 相应地, 用户设备在满足下列公式的 CFN时刻接收所述 MBMS业务:
(CFN div N) mod TDM— Rep = TDM— Offset + i, i = 0 to TDM— Length - 1 以下用一个应用示例说明一下。 例如, 当有两个 MBMS业务 A和 B, 通 过时分复用物理信道资源进行传输时, 其中业务 A速率为 M, 业务 B速率为 2倍的 M, 当业务 A和 B占用信道资源的比例为 1: 2时, 可以达到最优的资 源分配效率。 设置 A和 B的 TDM Rep为 3 , 传输信道的 TTI为 40ms, 即 N = 4。 根据本实施例, 其中 TDM Length的值为一个 MBMS业务连续占用的 信道资源的 ΤΉ个数, 对业务 A, 设置其 TDM Offset = 0, TDM Length=l , 对业务 Β ,设置其 TDM Offset = 1 , TDM Length = 2。 在发送时, 在一个 TDM Rep内, 业务 A占用的信道资源为: 第一个 TTI时间内的所有系统帧; 业务 B占用的信道资源为: 第二、 第三个 TTI时间内的所有系统帧。
第二实施例
本实施例方法的步骤与上一实施例是相似的, 这里不再重复, 只是在于 具体实施上有些不同。在本实施例中,在 RNC根据 MBMS业务需要,在 MBMS Current Cell rb Information消息的 MBSFN TDM Info List信元中的时分复用配 置信息中, 增加了一组 TDM Offset信元。
所述 TDM Offset信元用来表示在一个 TDM Re 内,一个 MBMS业务占 用信道资源的数量和位置信息。 即在一个 TDM Rep内, 一个 MBMS业务在 TDM Offset信元定义的时间内占用信道资源。
所述的 TDM offset信元定义为一组 TDM Offset Bitmap (时分复用偏移位 图)信元, 配置信息中定义的信元见表 2。 表 2 MBSFN TDM Info Lis (表 加下划线者为新增)
Figure imgf000013_0001
可以看出, 该信元的每个比特代表重复周期内的一个 TDM Offset值, 如 果一个 MBMS业务的 TDM Offset Bitma 第 i位的值被置为 1(也可以置为 0 , 效果是一样的) , 则无线资源控制实体在一个 TDM Rep内, 满足公式 ( 1 ) 的所有 TTI时间的所有 CFN内发送该 MBMS业务。而用户设备也在这些 CFN 内接收该 MBMS业务。
(CFN div N) mod TDM— Rep = TDM— Offset, i
其中, TDM— Offfset,i表示一个重复周期内的所述 MBMS业务占用的第 i 个 TTI的偏移值, i的取值由 TDM Offset Bitma 中被置为 1 (或表示占用状 态的其他值) 的比特位的位置决定。
仍用一个应用示例说明一下。 例如, 当有两个 MBMS业务 A和 B, 通过 时分复用物理信道资源进行传输时, 其中业务 A速率为 M, 业务 B速率为 2 倍的 M, 当业务 A和 B占用信道资源的比例为 1: 2时, 可以达到最优的资 源分配效率。设置 TDM Rep为 3 ,系统帧为 10ms帧,传输信道的 TTI为 40ms, 即 N = 4。
根据本实施例,如果定义了 TDM Offset Bitmap ,对业务 A,设置其 TDM Offset Bitmap为二进制值 000000010 , 也就是该信元的第二个比特设置为 1 , 其余比特设置为 0 ; 对业务 B , 设置其 TDM Offset Bitma 为二进制值 000000101 , 也就是该信元的第 1 , 第 3个比特设置为 1 , 其余比特设置为 0。 这 9位中的有效位如 3位由用户设备和网络侧约定好。这样,在一个 TDM Rep 内, 业务 A占用的信道资源为: 第二个 TTI时间内的所有 10ms帧; 业务 B 占用的信道资源为: 第一、 第三个 TTI时间内的所有 10ms帧。
在其它实施例中, 所述 TDM offset信元还可以定义为一个 TDM Offset 的列表, 如表 3所示, 定义了 TDM Offset List (时分复用偏移列表)信元, 该信元中包含一个或多个表项 TDM— Offset , 其值为整型, 表示在一个 TDM Re 中占用资源所在的一个或多个 ΤΉ的位置。
表 3 MBSFN TDM Info Lis (表 加下划线者为新增)
Figure imgf000014_0001
则一个 MBMS业务在一个 TDM Re 内满足下述公式的所有 TTI时间的 所有 CFN 内, 占用信道资源。 包括网络侧在这些信道资源上发送该 MBMS 业务, 用户设备也在这些信道资源上接收 MBMS业务。
(CFN divN) mod TDM— Rep= TDM— Offset, i
其中 TDM Offset,i 为该业务的 TDM Offset List时分复用偏移列表中的第 i个表项的值, 取值范围见表 3。
仍以一个应用实例来说明。 例如, 当有两个 MBMS业务 A和 B, 通过时 分复用物理信道资源进行传输时, 其中业务 A速率为 M, 业务 B速率为 2倍 的 M, 当业务 A和 B占用信道资源的比例为 1: 2时, 可以达到最优的资源 分配效率。设置 TDM Rep为 3 , 系统帧为 10ms帧,传输信道的 TTI为 40ms, 即 N = 4。 如果 TDM Offset信元为一个 TDM Offset的列表,对业务 A,设置其 TDM Offset List包括一个表项, 其值为 2, 对业务 B, 设置其 TDM Offset List包括 两个表项, 其值分别为 1 , 3。 这样, 在一个 TDM Rep内, 也可以实现业务 A 占用的信道资源为: 第二个 TTI时间内的所有 10ms帧; 业务 B占用的信道 资源为: 第一、 第三个 TTI时间内的所有 10ms帧。

Claims

权 利 要 求 书
1、 一种多媒体广播组播 MBMS业务时分复用的实现方法, 包括: 在 MBMS 业务釆用点到多点承载方式且通过时分复用来共享信道资源 传输业务时, 网络侧将所述 MBMS业务的配置信息告知用户设备并在满足所 述配置信息的信道资源上发送所述 MBMS业务,该配置信息包括时分复用重 复周期信息, 以及在一个时分复用周期内占用信道资源的位置和占用信道资 源的数量信息;
所述用户设备收到所述配置信息后, 在所指示的信道资源上接收所述 MBMS业务。
2、 如权利要求 1所述的实现方法,其特征在于,所述占用信道资源的位 置信息是指所述 MBMS业务在一个时分复用周期内,所占用信道资源的传输 时间间隔的偏移信息,所述占用信道数量信息是指所述 MBMS业务在一个重 复周期内占用的信道资源的传输时间间隔个数或系统帧个数。
3、 如权利要求 2所述的实现方法,其特征在于,所述资源占用数量信息 为时分复用重复长度信息, 用一个时分复用周期内, 一个 MBMS业务从表示 占用资源位置信息的起始偏移时间 TDM Offset对应的传输时间间隔开始,连 续占用的信道资源的传输时间间隔个数表示,或者是从 TDM Offset对应的系 统帧开始连续占用的信道资源的系统帧个数表示。
4、 如权利要求 3所述的实现方法,其特征在于, 网络侧在满足所述配置 信息的信道资源上发送所述 MBMS业务时, 按下述公式将 MBMS业务调度 到相应的系统帧上, 相应地, 所述用户设备也在满足下述公式的系统帧上接 收所述 MBMS业务:
(CFN div N) mod TDM— Rep = TDM— Offset + i, i = 0 to TDM— Length - 1 其中:
-CFN为系统帧的连接帧号;
-N为承载 MBMS业务的传输信道的传输时间间隔的长度, 即一个传输 时间间隔包含的系统帧个数;
-(CFN divN)是整除算式, 表示向下取整;
-TDM Rep 为所述重复周期的长度信息;
-TDM— Offset为所述起始偏移时间,即所述 MBMS业务在一个重复周期 内占用资源的位置信息;
-TDM— Length 为所述 MBMS业务在一个重复周期内连续占用的传输时 间间隔的个数信息, 也即所述 MBMS业务占用信道资源的数量信息。
5、 如权利要求 2所述的实现方法,其特征在于,所述占用资源位置信息 和数量信息用一组时分复用偏移位图 TDM Offset Bitma 表示, 所述 TDM Offset Bitma 的一个比特对应一个时分复用重复周期内的一个传输时间间 隔, 该比特的值表示所述 MBMS业务是否占用其对应的传输时间间隔, 该比 特在所述比特位图中的位置与其对应的传输时间间隔在重复周期内的起始偏 移时间 TDM Offset——对应。
6、 如权利要求 5所述的实现方法,其特征在于, 网络侧在满足所述配置 信息的信道资源上发送所述 MBMS业务时, 按下述公式将 MBMS业务调度 到相应的系统帧上, 相应地, 所述用户设备也在满足下述公式的系统帧上接 收所述 MBMS业务:
(CFN div N) mod TDM Rep = TDM— Offset, i
其中:
-CFN为系统帧的连接帧号;
-N为承载 MBMS业务的传输信道的传输时间间隔的长度, 即一个传输 时间间隔包含的系统帧个数;
-(CFN divN)是整除算式, 表示向下取整;
-TDM Re 为重复周期的长度信息;
-TDM—Offfset,i表示一个重复周期内的所述 MBMS业务占用的第 i个 ΤΉ 的偏移值, i的取值由 TDM Offset Bitma 中被置为表示占用状态的值的比特 位的位置决定。
7、 如权利要求 2所述的实现方法,其特征在于,所述占用资源位置信息 和数量信息用一个时分复用偏移的列表表示, 该列表中包括一个或多个时分 复用偏移的表项, 所述 MBMS业务在一个时分复用重复周期内, 占用该列表 中所有表项中的值所对应的传输时间间隔。
8、 如权利要求 7所述的实现方法,其特征在于, 网络侧在满足所述配置 信息的信道资源上发送所述 MBMS业务时, 按下述公式将 MBMS业务调度 到相应的系统帧上, 相应地, 所述用户设备也在满足下述公式的系统帧上接 收所述 MBMS业务:
(CFN divN) mod TDM— Rep= TDM— Offset, i
其中:
-CFN为系统帧的连接帧号;
-N为承载 MBMS业务的传输信道的传输时间间隔的长度, 即一个传输 时间间隔包含的系统帧个数;
-(CFN divN)是整除算式, 表示向下取整;
-TDM Re 为重复周期的长度信息;
-TDM— Offfset,i表示所述 MBMS业务的时分复用偏移列表中的第 i个表 项的值。
9、 如权利要求 2所述的实现方法,其特征在于,所述占用信道数量信息 在缺省情况下, 表示在一个时分复用周期内, 一个 MBMS业务占用信道资源 的时间为一个传输时间间隔。
10、 如权利要求 1至 9中任一权利要求所述的实现方法, 其特征在于, 所述配置信息是通过 MBMS点到多点控制信道的 MBMS当前小区点到多点 无线承载信息消息, 或者 MBMS 公共点到多点无线承载信息消息, 或者 MBMS一般信息消息中的 MBMS单频网时分复用信息列表信元即 MBSFN TDM Info List发送给所述用户设备的。
11、 如权利要求 1至 9中任一权利要求所述的实现方法, 其特征在于, 为多个 MBMS业务时分复用信道资源时, 在一个时分复用重复周期内, 传输 速率大的 MBMS 业务占用的信道资源大于等于速率小的业务占用的信道资 源。
12、 一种多媒体广播组播 MBMS业务中时分复用信息的传输方法,网络 侧釆用点到多点承载方式并通过时分复用共享信道资源来传输 MBMS 业务 时,发送给用户设备的所述 MBMS业务的配置信息包括时分复用重复周期信 息、 在一个时分复用周期内占用信道资源的位置信息, 以及在一个时分复用 周期内占用信道资源的数量信息。
13、 如权利要求 12所述的传输方法,其特征在于, 所述网络侧的无线网 络控制器通过 MBMS点到多点控制信道的信道消息将所述 MBMS业务的配 置信息告知用户设备。
14、 如权利要求 13所述的传输方法,其特征在于, 所述用户设备收到所 述配置信息后, 在所指示的信道资源上接收所述 MBMS业务。
15、 如权利要求 12或 13所述的传输方法, 其特征在于, 所述配置信息 中的资源占用数量信息和资源占用位置信息的表示方式为以下几种方式中的 一种:
所述占用资源位置信息用起始偏移时间 TDM Offset表示,所述资源占用 数量信息用时分复用重复长度表示, 即用一个时分复用周期内, 一个 MBMS 业务从 TDM Offset对应的传输时间间隔开始,连续占用的信道资源的传输时 间间隔个数表示,或者是从 TDM Offset对应的系统帧开始连续占用的信道资 源的系统帧个数表示;
所述占用资源位置信息和数量信息用一组时分复用偏移位图 TDM Offset Bitma 表示 ,所述 TDM Offset Bitma 的一个比特对应一个时分复用重复周期 内的一个传输时间间隔,该比特的值表示所述 MBMS业务是否占用其对应的 传输时间间隔, 该比特在所述比特位图中的位置与其对应的传输时间间隔在 重复周期内的起始偏移时间 TDM Offset——对应;
所述占用资源位置信息和数量信息用一个时分复用偏移的列表表示, 该 列表中包括一个或多个时分复用偏移的表项,所述 MBMS业务在一个时分复 用重复周期内, 占用该列表中所有表项中的值所对应的传输时间间隔。
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