WO2008028366A1 - Procédé d'estimation d'un transfert utilisé par un terminal de diffusion multimédia mobile - Google Patents

Procédé d'estimation d'un transfert utilisé par un terminal de diffusion multimédia mobile Download PDF

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Publication number
WO2008028366A1
WO2008028366A1 PCT/CN2006/003774 CN2006003774W WO2008028366A1 WO 2008028366 A1 WO2008028366 A1 WO 2008028366A1 CN 2006003774 W CN2006003774 W CN 2006003774W WO 2008028366 A1 WO2008028366 A1 WO 2008028366A1
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Prior art keywords
terminal
threshold
multimedia broadcast
mobile multimedia
packet
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French (fr)
Inventor
Xiaoguang Zhu
Biao Wang
Hua Jiang
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality

Definitions

  • the present invention relates to the field of digital mobile communications, and in particular, to a handover of a mobile multimedia broadcast terminal.
  • Transmitting and receiving that is, the multimedia data information set of each broadcast monthly service in the time domain is continuously modulated on a plurality of OFDM symbols, and the mobile multimedia broadcast receiving terminal also concentrates on receiving the multimedia service during this time period, and in each frame At other times, the receiving terminal is in an off-time state to achieve terminal power saving.
  • the mobile multimedia broadcast network can broadcast different multimedia service content in different regions or at different frequencies, so when the mobile multimedia broadcast user moves to the regional junction or the receiving frequency signal is poor, switching will occur to improve the receiving service quality, and it is necessary to provide a A terminal handover decision method.
  • the mobile multimedia broadcast network adopts the one-way communication mode, that is, from the transmitter system to the mobile receiving system, and the reverse can borrow the mobile communication network to perform functions such as authentication and on-demand, so the mobile multimedia broadcast network system cannot perform handover control on the receiving terminal in real time. , causing the switching operation to be completed by the receiving terminal, that is, one-way communication switching.
  • the receiving terminal needs to prepare in advance for the handover operation, then the receiving terminal can listen to the adjacent sector channel during the service closing time, including the traffic channel or the control channel (system) Logical channel), but monitoring neighboring cells has a great impact on terminal power consumption. Therefore, it is necessary to provide a mobile multimedia broadcast terminal handover decision method.
  • the technical problem to be solved by the present invention is to provide a handover decision method for a mobile multimedia broadcast receiving terminal, which reduces the power consumption of the terminal to a minimum on the premise of improving the quality of the multimedia service received by the terminal.
  • the present invention provides a method for effectively switching a mobile multimedia broadcast receiving terminal, and the specific implementation method and the content thereof are as follows:
  • the terminal is in an active state, and the sampled data packet is calculated by a bit error rate or a frame error rate. If the error rate or the frame error rate is greater than the handover threshold, the data packet is an error packet;
  • step (b) the terminal calculates the error packet rate, determines whether the error packet rate exceeds the error packet ratio threshold, and if so, the terminal starts to listen to the neighbor channel; otherwise, returns to step (a);
  • the terminal compares the signal quality of the sector and the adjacent sectors. If the signal quality of all sectors is less than the minimum threshold required for demodulation, the terminal stops all receiving mobile multimedia broadcast services; if adjacent sectors If the signal quality is greater than the sector in which the terminal is originally located and is greater than the demodulation minimum threshold, the receiving terminal switches to the adjacent sector with the highest signal quality, otherwise it does not switch.
  • the network system side carries a CRC bit in the physical layer data packet, and the terminal determines the error rate or the frame error rate according to the CRC bit.
  • the error rate switching threshold in the step (a) is 6% to 9%.
  • the error packet ratio threshold in the step (b) is 55% to 70%.
  • the terminal monitors the neighboring cell channel according to the neighboring cell list information.
  • the neighbor list information is configured by the mobile multimedia broadcast network side system, and the neighboring area information is sent to the terminal through the air interface of the mobile multimedia broadcast system by the proprietary control channel or its overhead channel, including the number of adjacent sectors, the frequency band. , frequency and sub-network coding information, the terminal monitors adjacent sector channels according to the information.
  • the step (b) if the error packet rate is greater than the error packet ratio threshold, the terminal starts monitoring when the service is closed.
  • the signal quality in the step (c) is derived from the bit energy/interference density E b /N of the signal.
  • the present invention provides a method for handover decision of a mobile multimedia broadcast receiving terminal.
  • the bit error rate or the frame error rate is greater than a set threshold
  • the neighboring zone is started to be monitored and passed through E b /N with the neighboring cell.
  • SNR comparison if the energy per bit energy of the neighboring cell and the noise density ratio or signal to noise ratio are larger than the local sector, the terminal switches to the adjacent sector.
  • the method does not need to monitor the neighboring cell in all service closing times, and provides a method for starting the interception judgment, and the neighboring area is monitored after the condition is met, otherwise the normal service processing is performed, thereby improving the quality of receiving the multimedia service and reducing the power consumption of the terminal.
  • FIG. 1 is a schematic diagram of a mobile multimedia broadcast network based on OFDM technology according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of monitoring a multimedia broadcast network terminal according to an embodiment of the present invention
  • FIG. 3 is a physical layer data packet after adding a CRC bit according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a handover decision process of a mobile multimedia broadcast receiving terminal according to an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
  • Figure 1 is a schematic diagram of a mobile multimedia broadcast network based on OFDM technology. The user terminal moves in three network areas A, B and C.
  • the terminal receives a plurality of OFDM symbols in a frame per second, and the data information of each multimedia service is concentrated in consecutive symbols, that is, transmitted in a time division manner, so the terminal can monitor at a time other than receiving the monthly service every frame.
  • the terminal can perform neighboring area monitoring.
  • FIG. 2 shows that the user terminal receives the service c before and after the A network.
  • the terminal determines whether to monitor the adjacent sector channel by determining the bit error rate (BER: Bit Error Rate).
  • the mobile multimedia broadcast system needs to add a description of the associated error rate information, which is implemented by the system transmitting side in the physical layer data packet to increase the p CRC bit (Cyclic Redundancy Check: Cyclic Redundancy Check).
  • the media access layer packet has 142 bytes.
  • the physical layer data packet adds a 2-byte CRC check bit at the end.
  • the error rate is greater than the switching threshold. If it is greater than, the terminal system needs to be in the non-serving time (Off-time).
  • the data packet of the multimedia service randomly extracts a certain number of data packets to calculate the error rate. To this end, it is necessary to increase the calculation of the error packet rate, which is equal to "the number of packets larger than the switching threshold" divided by the "number of randomly extracted packets” , also set the "error packet proportional threshold", if the error packet rate exceeds the proportional threshold, start adjacent sector monitoring, otherwise you do not need to listen to adjacent sectors.
  • the terminal monitors the B and C sectors according to the neighbor list information, which is planned and configured by the mobile multimedia broadcast network system, and transmitted by the transmitter to the terminal through the air interface.
  • the information content includes the number of neighboring cells, the neighboring cell sub-network number, the neighboring cell band, and the frequency.
  • the neighboring cell number indicates the number of neighboring sectors in the area, and the neighboring cell sub-network number is the neighboring cell identifier, which can also be used by the user. Network sector, but different frequencies.
  • the frequency band of the neighboring area is the frequency band in which the spectrum of the neighboring area is located, and the frequency point of the neighboring area is the specific frequency point of the adjacent sector.
  • FIG. 4 is a flowchart of a terminal area handover decision.
  • Step 401 When the terminal is in an active state, that is, receiving a mobile multimedia broadcast service, the sample data packet is subjected to a bit error rate calculation; Step 402: If the data packet is If the error rate exceeds the threshold of 7 %, it is an error packet, and the error packet rate is calculated. The terminal determines whether the error packet rate exceeds the error packet ratio threshold by 60%. If yes, go to step 403; otherwise, continue the error packet. Rate calculation; Step 403: The terminal monitors the neighboring area according to the neighboring area list information, and obtains the neighboring area E b /N. Information: Step 404: The terminal determines the maximum E b /N of the area and the neighboring area.
  • Step 405 The terminal sets the E b /N of the zone with the neighboring zone. If the value of the local area is the largest, the process proceeds to step 401. If the value of the local area is not greater than the neighboring cell value, step 407 is performed. Step 406: The terminal ends the receiving service, that is, the terminal can no longer continue to demodulate the mobile multimedia broadcast data. End. Step 407: The terminal switches to E b /N. The neighboring area with the largest ratio receives the mobile multimedia broadcast service of the neighboring area and ends.
  • the bit error rate switching threshold may be 6% to 9%, and the error packet ratio threshold may be 55% to 70%.
  • the above error rate can also be replaced by a frame error rate, which is implemented in the same manner as the bit error rate.
  • the above E b /N. Information can also be replaced with signal to noise ratio SNR information, or other parameters that reflect signal quality.

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

Description

一种移动多 某体广播终端的切换判决方法 技术领域 本发明涉及数字移动通讯领域，尤其涉及一种移动多媒体广播终端的切换
( handover ) 判决方法。 背景技术 近年来， 数字移动多媒体广播技术和标准发展迅速， 例如欧洲的 DVB-H (数字视频广播手持式接收： Digital Video Broadcast Handheld )、 美国的 MediaFLO (媒体单一前向链路： Media Forward Link Only ) 和中国的 CMMB (中国移动多媒体广播： China Mobile Multimedia Broadcast ) 等， 都采用基于 OFDM (正交频分复用： Orthogonal Frequency Division Multiplexing )调制技术， 为了节约接收终端功耗， 都采用了时分方式发送和接收， 即在时域上每项广播 月艮务的多媒体数据信息集中连续在多个 OFDM符号上调制，移动多媒体广播接 收终端也集中在这一时间段接收该多媒体服务， 而在每帧的其他时间里， 接收 终端处于关闭 （Off- time ) 状态， 以达到终端节能。 移动多媒体广播网络在不同地域或者不同频率可以播发差异性多媒体服 务内容， 所以当移动多媒体广播用户移动到区域交界处时或者接收频率信号较 差时将发生切换， 以提高接收服务质量， 需要提供一种终端切换判决方法。 移动多媒体广播网络都采用单向通讯方式，即从发射机系统到移动接收系 统， 反向可以借用移动通讯网络完成鉴权、 点播等功能， 所以移动多媒体广播 网络系统不能实时对接收终端进行切换控制， 导致切换操作都由接收终端完 成， 即单向通讯切换。 为了提高移动多媒体广播服务质量以达到无缝切换，接收终端对切换操作 需要提前做准备工作， 那么接收终端就可以在服务关闭时间内进行监听相邻扇 区信道， 包括业务信道或者控制信道（系统逻辑信道）， 但是监听相邻小区对 终端功耗影响很大， 所以需要提供一种移动多媒体广播终端切换判决方法， 在 提高终端接收多媒体广播服务质量的前提下， 又要对终端功耗影响降低到最 低。 发明内容 本发明要解决的技术问题是提出一种实现移动多媒体广播接收终端的切 换判决方法， 在提高终端接收多媒体服务质量的前提下， 又使终端功耗降到最 低。 为了达到上述目的，本发明提供一种移动多媒体广播接收终端有效切换判 决方法， 具体实现方法和包含内容如下：
( a )终端处于激活状态， 抽样数据包进行误码率或误帧率计算， 如果误 码率或误帧率大于切换门限， 则该数据包为误码包；
( b )终端计算误码包率， 判断误码包率是否超过误码包比例门限， 如果 是， 则终端开始监听邻区信道； 否则返回步骤（a );
( c )终端比较本扇区和相邻各扇区的信号质量， 如果所有扇区的信号质 量都小于解调所需的最低门限， 则终端停止所有接收移动多媒体广播服务； 如 果相邻扇区的信号质量大于终端原来所处的扇区且大于解调最低门限， 则接收 终端切换到所述信号质量最大的相邻扇区中， 否则不切换。 其中所述步骤（ a )中网络系统侧在物理层数据包中带有 CRC位， 终端根 据来 CRC位来判断误码率或误帧率。 所述步骤（a ) 中误码率切换门限为 6% ~ 9%。 所述步骤 （ b ) 中误码包率 ==大于切换门限的数据包数目 /随机抽取数据包 数目。 所述步骤（ b ) 中误码包比例门限为 55% ~ 70%。 所述步骤（ b ) 中终端根据邻区列表信息监听邻区信道。 所述邻区列表信 息由移动多媒体广播网路侧系统配置， 并由专有控制信道或其开销信道通过移 动多媒体广播系统空中接口将邻区信息发给终端， 包括相邻扇区的数目、频段、 频点和子网编码信息， 终端根据这些信息监听相邻扇区信道。 所述步骤（b ) 中如果误码包率大于误码包比例门限， 终端在服务关闭的 时候启动监听。 所述步骤 （c ) 中信号质量由信号的比特能量 /干扰借密度 Eb/N。或者信噪 比 SNR来判断。 总之， 本发明提供了一种移动多媒体广播接收终端切换判决的方法， 当误 码率或误帧率大于设定门限后， 启动监听邻区， 通过与邻区的 Eb/N。或 SNR比 较， 如果邻区的每比特能量与干扰语密度比值或信噪比大与本扇区， 则终端切 换到相邻扇区。 本方法不需要在所有服务关闭时间内监听邻区， 提供启动监听 判决方法， 满足条件才监听邻区， 否则正常业务处理， 因而既提高了终端接收 多媒体服务质量， 又降低了终端功耗。 附图说明 图 1为本发明实施例一种基于 OFDM技术移动多媒体广播网络示意图； 图 2为本发明实施例多媒体广播网络终端监听示意图； 图 3为本发明实施例增加 CRC位后物理层数据包组成示意图； 图 4为本发明实施例移动多媒体广播接收终端切换判决处理流程图。 具体实施方式 下面结合附图和实施例^"本发明作进一步 i 细的说明。 图 1所示为一种基于 OFDM技术移动多媒体广播网络示意图。 用户终端 在 A, B , C三个网络区域中移动。 终端接收的每秒帧中包含有多个 OFDM符 号，每项多媒体服务的数据信息集中在连续符号中传送， 即以时分的方式传送， 所以在每帧接收月艮务以外的时间终端可以监听邻区， 当移动多媒体广 "用户在 A网络中向八、 B和 C三个相邻网络区域移动时， 终端可以进行邻区监听， 图 2所示为用户终端在 A网络接收服务 c前后， 分别监听 C和 B网络， 获取 B， C扇区的信息的示意图。 终端通过判断误码率 （BER: Bit Error Rate ) 决定是否监听邻扇区信道。 为此移动多媒体广播系统需要增加相关误码率信息描述， 该信息通过由系统发 射侧在物理层数据包中增力 p CRC 位 （循环冗余码校验： Cyclic Redundancy Check ) 来实现。 如图 3所示， 媒体接入层包有 142字节， 在此基础上， 物理 层数据包在尾部增加 2字节 CRC校验位， 根据 CRC- CCITT标准， 发生器多项 式为： g(x)=xl b+x12+ x5+l 在接收终端侧， 根据 CRC判决误码率是否大于切换门限， 如果大于， 终 端系统需要在非^ -务时间 （ Off-time ) 里启动监听相邻扇区的信道。 由于每帧中移动多媒体广播数据量很大，每包数据如果都计算误码率，一 则没必要， 二则对终端系统影响较大导致耗电， 三则速度慢导致非实时， 所以 在每项多媒体服务的数据包中随机抽取一定数量的数据包计算误码率， 为此需 要增加误码包率的计算， 该比率等于 "大于切换门限的数据包数目" 除以 "随 机抽取数据包数目 " , 还要设置 "误码包比例门限"， 如果误码包率超过该比例 门限， 则启动相邻扇区监听， 否则不需要监听相邻扇区。 终端根据邻区列表信息监听 B， C扇区， 该信息由移动多媒体广播网络系 统规划和配置， 并由发射机通过空中接口发送给终端。信息内容包括邻区数目、 邻区子网络序号、 邻区频段和频点， 其中邻区数目表示所在区域的相邻扇区个 数， 邻区子网络序号为邻区标识， 也可以为用户所处的网絡扇区， 但不同频率。 邻区频段为邻区频谱所在频段， 邻区频点为相邻扇区具体频点。 如果网络系统侧不配置邻区列表信息 ,终端则需要在监听时遍历终端接收 频段的所有频点，该方法需要终端很长时间捕捉相邻扇区信道。遍历时间很长， 与所处频段相关， 通常是几帧到几十帧时长才能遍历结束， 对终端功耗影响很 大， 虽然也能达到发明目的， 但是效果不好。 图 4所示为终端区域切换判决流程图， 其主要步骤如下： 步骤 401 : 当终端处于激活状态， 即正在接收移动多媒体广播服务， 抽样 数据包进行误码率计算； 步骤 402: 如果该数据包误码率超过门限 7 %就为误码包， 计算误码包率， 终端判断误码包率是否超过误码包比例门限 60 % , 如果是， 转入步骤 403 ; 否 则， 继续进行误码包率计算； 步骤 403： 终端则根据邻区列表信息监听邻区， 获得邻区 Eb/N。信息； 步骤 404:终端判断本区与邻区最大的 Eb/N。值是否小于最小的解调门限, 例如 0, 如果是， 转入步骤 406; 否则， 亍步- 405； 步骤 405: 终端将本区与邻区的 Eb/N。值进行比较， 如果本区值最大， 则 转入步骤 401 , 如果本区值不大于邻区值， 执行步骤 407; 步骤 406: 终端结束接收服务， 即终端不能再继续解调移动多媒体广播数 据， 结束。 步骤 407： 终端切换到 Eb/N。比值最大的邻区， 接收该邻区的移动多媒体 广播服务， 结束。 上述误码率切换门限可为 6% ~ 9%, 误码包比例门限可为 55% ~ 70%。 上述误码率也可用误帧率代替， 其实现方式与误码率相同。 上述 Eb/N。信息也可以用信噪比 SNR信息代替， 或者别的能够反映信号 质量的参数。

Claims

权 利 要 求 书
1、 一种移动多媒体广播终端的切换判决方法， 主要包含以下步骤：
( a ) 终端处于激活状态， 抽样数据包进行误码率或误帧率计算， 如果 误码率或误帧率大于切换门限， 则该数据包为误码包；
( b ) 终端计算误码包率， 判断误码包率是否超过误码包比例门限， 如 果是， 则终端开始监听邻区信道； 否则返回步骤 （a ) ；
( c ) 终端比较本扇区和相邻各扇区的信号质量， 如果所有扇区的信号 质量都小于解调所需的最低门限， 则终端停止所有接收移动多媒体广播服务； 如果相邻扇区的信号质量大于终端原来所处的扇区且大于解调最低门限， 则接 收终端切换到所述信号质量最大的相邻扇区中， 否则不切换。
2、 如权利要求 1所述的方法， 其特征在于： 所述步骤（a ) 中网络系统侧在物理层 数据包中带有 CRC位， 终端根据来 CRC位来判断误码率或误帧率。
3、 如权利要求所述的方法 ,其特征在于： 所述步骤（ a )中误码率切换门限为 6% ~ 9%。
4、 如权利要求 1所述的方法， 其特征在于： 所述步骤（b ) 中误码包率 =大于切换 门限的数据包数目 /随机抽取数据包数目。
5、 如权利要求 1 所述的方法， 其特征在于： 所述步骤（b ) 中误码包比例门限为 55% ~ 70%。
6、 如权利要求 1所述的方法， 其特征在于： 所述步骤（b ) 中终端根据邻区列表信 息监听邻区信道。
7、 如权利要求 6所述的方法， 其特征在于： 所述邻区列表信息由移动多媒体广播 网路侧系统配置， 并由专有控制信道或其开销信道通过移动多媒体广播系统空 中接口将邻区信息发给终端， 包括相邻扇区的数目、 频段、 频点和子网编码信 息， 终端根据这些信息监听相邻扇区信道。
8、 如权利要求 1所述的方法， 其特征在于： 所述步骤（b ) 中如果误码包率大于误 码包比例门限， 终端在服务关闭的时候启动监听。 如权利要求 1所述的方法， 其特征在于： 所述步骤（c ) 中信号质量由信号的比 特能量 /干扰谱密度 Eb/N。或者信噪比 SNR来判断。
PCT/CN2006/003774 2006-09-01 2006-12-30 Procédé d'estimation d'un transfert utilisé par un terminal de diffusion multimédia mobile Ceased WO2008028366A1 (fr)

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CN110726809A (zh) * 2019-10-19 2020-01-24 北京工业大学 高可靠性可燃气体状态监测及报警设备设计方法
CN113012504A (zh) * 2021-02-24 2021-06-22 宜春职业技术学院（宜春市技术工人学校） 一种多人舞蹈教学互动投影方法、装置及设备
CN114845197B (zh) * 2022-04-28 2025-08-15 深圳市冠旭电子股份有限公司 真无线耳机监听播放方法和装置、电子设备、存储介质
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