WO2011054291A1 - 一种承载多播广播组播业务通知消息无线帧的确定方法及发送端 - Google Patents

一种承载多播广播组播业务通知消息无线帧的确定方法及发送端 Download PDF

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Publication number
WO2011054291A1
WO2011054291A1 PCT/CN2010/078370 CN2010078370W WO2011054291A1 WO 2011054291 A1 WO2011054291 A1 WO 2011054291A1 CN 2010078370 W CN2010078370 W CN 2010078370W WO 2011054291 A1 WO2011054291 A1 WO 2011054291A1
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Prior art keywords
value
subframe
mcch
notification message
radio frame
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PCT/CN2010/078370
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English (en)
French (fr)
Inventor
苟伟
马子江
赵楠
陈东丽
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US13/258,626 priority Critical patent/US8675533B2/en
Priority to EP10827905.0A priority patent/EP2403278B1/en
Publication of WO2011054291A1 publication Critical patent/WO2011054291A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/30Resource management for broadcast services
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a Long Term Evolution (LTE) system, and more particularly to a Multimedia Broadcast Multicast Service (Multimedia Broadcast Multicast Service) in a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) area.
  • LTE Long Term Evolution
  • MBMS Multimedia Broadcast Multicast Service
  • MMSFN Multimedia Broadcast Multicast Service Single Frequency Network
  • the sharing of resources improves the utilization of network resources (especially air interface resources).
  • the MBMS service 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, and provide a variety of rich video, audio and multimedia services, which undoubtedly conforms to future mobile
  • 3G third-generation digital communication
  • the MBMS service is characterized by a large amount of data in the service, a long duration of reception by the terminal, and a constant average data rate.
  • the above characteristics determine the scheduling of the MBMS service.
  • the control signaling configuration is semi-static, that is, the scheduling information of the MBMS service, and the control signaling information is kept "long-term", so that each multicast control channel (Multicast Control) Channel, MCCH)
  • MCCH Multicast Control Channel
  • an MBMS notification message a notification message (an English company called MCCH change notification, or MBMS notification indicator, or MBMS notification information, or MBMS notification, a Chinese company called an MBMS notification message, an MBMS notification message, or an MBMS indication message).
  • the MBMS notification message is used in English, and MBMS notification information is used as an example in English.
  • a small amount of information is used to describe whether the MCCH information to be sent is compared with the MCCH information sent last time. The connected terminal only needs to listen.
  • a small amount of MBMS notification message information is used according to the MBMS notification message terminal to decide whether to receive the upcoming MCCH information.
  • LTE R9 has determined to introduce MBMS notification messages. Which MBMS notification messages should be carried in those radio frames and subframes? It is not clear at present, and it needs to be described and distributed by a method.
  • the present invention is to solve the above technical problem, and provides a method for determining a radio frame carrying a multicast broadcast multicast service notification message, which uses the original parameters of the system to determine a radio frame and a subframe in which the MBMS notification message is located, and does not need to send any signaling.
  • the protocol and the receiving end only need to complete the sending and receiving of the MBMS notification message by means of a protocol, so as to implement the sending of the MBMS notification message.
  • a method for determining a radio frame of a multicast broadcast multicast service notification message includes: configuring a multicast control channel (MCCH) modification period (MCCHMP) and a periodic coefficient at a transmitting end
  • the radio frame corresponding to the SFN value is a radio frame that sends an MBMS notification message;
  • the value of the MCCHMP is the value of the MCCH modification period of the MBSFN area.
  • the value of the MCCHMP is MCCH of multiple MBSFN areas.
  • the value of the MCCH modification period of the MBSFN area with the smallest period is modified;
  • the PeriodCoeff represents the number of times the MBMS notification message is sent within one MCCH modification period.
  • SFN mod (MCCHMP/PeriodCoeff) NotificationOffset
  • the SFN is a system frame number specified by the LTE system, and the value ranges from 0 to 1023.
  • the MCCHMP indicates an MCCH modification period, and the NotificationOffset is an offset.
  • the value of the NotificationOffset is the same as the value of the offset in the MBSFN area when the cell is covered by only one MBSFN area;
  • the PeriodCoeff value is less than or equal to the ratio of the value of the MCCH modification period of the MBSFN area to the value of the MCCH repetition period of the MBSFN area.
  • the value of the PeriodCoeff is less than or equal to the ratio of the value of the MCCH modification period of each MBSFN area covering the cell to the value of the MCCH repetition period of the MBSFN area.
  • the value of the offset corresponding to the MBSFN area in which the MCCH repetition period is the smallest in the plurality of MBSFN areas is the value of the offset corresponding to the MBSFN area in the MBSFN area;
  • the value of the offset of the MBSFN area in which the MCCH modification period is the smallest in the plurality of MBSFN areas is the value of the offset corresponding to the MBSFN area in which the MCCH modification period is the smallest.
  • the method further includes: determining, in the radio frame, a subframe that carries an MBMS notification message, where determining, in the radio frame, a subframe that carries an MBMS notification message includes: using a subframe that carries an MCCH to carry an MBMS notification Message
  • the fixed subframe is used to carry the MBMS notification message by using the protocol; or the bitmap is used to indicate the subframe carrying the MBMS notification message; or, the sending subframe number is used.
  • the step of using the bearer carrying the MCCH to carry the MBMS notification message includes: sending an MBMS notification message in the first subframe that carries the MCCH;
  • the use of the bitmap to indicate that the subframe that carries the MBMS notification message includes: using 6 bits, and the FDD mode corresponding to the indication subframes #1, #2, #3, #6, #7, #8, when the corresponding bit position "1", indicating that the subframe is selected as a subframe carrying the MBMS notification message, and the TDD mode corresponding to the subframes other than the #0, #1, #5, and #6 subframes;
  • the transmit subframe number uses: 3 bits are used to select 6 values to describe 6 subframes. In the FDD mode, "000” indicates subframe #1, "001" indicates subframe #2, and “010” indicates subframe. #3 , "011” indicates subframe #6, “100” indicates subframe #7, "101” indicates subframe #8;
  • the present invention further provides a determining and transmitting end of a radio frame carrying a multicast broadcast multicast service notification message, including a configuration module, and a determining a radio frame module;
  • the configuration module is configured to: configure a multicast control channel (MCCH) modification period (MCCHMP) and a period coefficient ( PeriodCoeff) and a notification message offset (NotificationOffset);
  • MCCH multicast control channel
  • MCCHMP modification period
  • PeriodCoeff period coefficient
  • NotificationOffset notification message offset
  • the radio frame module Determining that the radio frame module is set to: when the system frame number (SFN) and the MCCHMP and PeriodCoeff ratio are modulo equal to the NotificationOffset, the radio frame corresponding to the SFN value is determined as the radio frame that sends the MBMS notification message;
  • SFN system frame number
  • MCCHMP and PeriodCoeff ratio are modulo equal to the NotificationOffset
  • the value of the MCCHMP is the value of the MCCH modification period of the MBSFN area.
  • the value of the MCCHMP is MCCH of multiple MBSFN areas.
  • the value of the MCCH modification period of the MBSFN area with the smallest period is modified; the PeriodCoeff represents the number of times the MBMS notification message is sent within one MCCH modification period.
  • the determining the radio frame module is further configured to: determine, as the radio frame corresponding to the SFN, the radio frame that satisfies the following equation,
  • the SFN is a system frame number specified by the LTE system, and the value ranges from 0 to 1023.
  • the MCCHMP indicates an MCCH modification period, and the PeriodCoeff indicates the number of times the MBMS notification message is sent during an MCCH modification period, and the NotificationOffset is an offset.
  • the value of the NotificationOffset is the same as the value of the offset in the MBSFN area
  • the PeriodCoeff value is less than or equal to the ratio of the value of the MCCH modification period of the MBSFN area to the value of the MCCH repetition period of the MBSFN area.
  • the PeriodCoeff value is less than or equal to the coverage.
  • the value of the offset of the MBSFN area in which the MCCHN is the smallest in the multiple MBSFN areas is the value of the offset corresponding to the MBSFN area in the multiple MBSFN areas.
  • the value of the offset of the MBSFN area in which the MCCH modification period is the smallest in the plurality of MBSFN areas is the value of the offset corresponding to the MBSFN area in which the MCCH modification period is the smallest.
  • the foregoing determining the radio frame module further includes a subframe module of one of the following,
  • a first subframe module configured to: determine, in the radio frame, a subframe that carries an MBMS notification message, and use a subframe that carries the MCCH to carry an MBMS notification message;
  • the second subframe module is configured to: use a fixed subframe to carry the MBMS notification message by using a protocol; the third subframe module is configured to: use a bitmap to indicate a subframe that carries the MBMS notification message;
  • the fourth subframe module is set to: Use the transmit subframe number.
  • the location determination of the MBMS notification message is implemented with a minimum signaling overhead; the location determination of the MBMS notification message can be implemented in the cell where the overlapping does not occur, and can also be applied to the cell of the overlapping coverage to implement the MBMS notification message.
  • the location is determined such that the radio frame for transmitting the MBMS notification message is obtained with less MCCH information, so that the terminal receiving and parsing process is more power efficient.
  • Figure 1 is a schematic diagram of overlapping coverage of MBSFN areas
  • FIG. 2 is a schematic diagram of a determining transmitting end of a radio frame carrying an MBMS notification message.
  • the MCCH transmission configuration is performed in the MBSFN area, specifically, the MCCH reuse repetition period and the modification period.
  • the general modification period is greater than the repetition period.
  • the MCCH information is repeatedly sent multiple times in one modification period, and the MCCH is allowed to change, and only the MCCH is modified.
  • the MCCH information is allowed to change when the cycle arrives.
  • the MBMS notification message is introduced, that is, the MBMS notification message is sent in each MCCH modification period, and the receiving end receives the parsing MBMS notification.
  • the message is used to know whether the MCCH information at the timing of the upcoming MCCH modification period is updated.
  • the MBMS notification message informs the receiving end that the MCCH information at the timing of the upcoming MCCH modification period is not updated, the receiving end may not receive, otherwise, the receiving is performed. Analysis.
  • the period coefficient PeriodCoeff in Equation 1 represents the number of times an MBMS notification message is sent within a MCCH modification period. Other parameters are described in the "Invention" section.
  • SFN is the system frame number, which is called System Frame Number.
  • the present invention also provides a method for determining a subframe that carries an MBMS notification message, as described in the "Inventory Content" section.
  • the entire invention is counted in units of radio frames.
  • Each parameter in the equation calculation is in units of radio frames.
  • MCCHRP MCCH Repetition Period
  • MCCHMP MCCH Modification Period
  • the radio frame corresponding to the SFN is the radio frame carrying the MCCH.
  • the repetitionPeriod is 640 ms, and it can also be expressed as 64 radio frames, which is denoted as 64 rf.
  • the radio frame with values of 0, 64, 128, 192, 256... carries the MCCH.
  • the value of SFN is specified in LTE as 0 ⁇ 1023, and the cycle is cyclic.
  • the MCCH modification period is 2560 ms, and can also be expressed as 256 radio frames, which is recorded as 256 rf. That is to say, one MCCH modification period in the MBSFN area includes four MCCH repetition periods, that is, the MCCH modification period appears on the radio frame with SFNs of 0, 256, 512..., which can also be understood as MCCH on these radio frames. It is allowed to be updated. It can be seen that the MCCH modification period only defines how many MCCH repetition periods are separated, allowing the MCCH information to be updated.
  • the above is the configuration of the MCCH in the MBSFN area specified in the current LTE.
  • the following describes the determination of the radio frame carrying the MBMS notification message according to the method provided by the present invention.
  • the value of the parameter PeriodCoeff is first determined.
  • 2 or 4 is proposed.
  • the parameter is configured as 2, and the parameter is sent to the receiving end.
  • the parameter can be fixed to a certain value directly through the protocol, so that the signaling can be omitted to the receiving end, but the flexibility of the parameter value is reduced by fixing the corresponding value by the protocol.
  • the receiving end needs to determine which radio frames and subframes carry the MBMS notification message when receiving the MBMS notification message.
  • the two methods are the same.
  • only the receiving end is taken as an example.
  • the MBMS notification messages on those radio frames are active for that MCCH modification period.
  • the MBMS notification message of other locations and its corresponding MCCH modification period are analogous. The first one is selected in this embodiment.
  • a method of determining a subframe carrying an MBMS notification message in an already determined radio frame is also provided.
  • Manner 1 The MBMS notification message is carried in a Physical Downlink Control Channel (PDCCH) of a subframe carrying the MCCH.
  • PDCCH Physical Downlink Control Channel
  • the MCCH is carried in multiple subframes, it is recommended to carry the MBMS notification message in the first subframe carrying the MCCH.
  • Mode 2 using a radio intra-frame fixed subframe, that is, fixing the subframe position by a protocol. For example, a subframe having a subframe number of #1 is fixedly used.
  • Mode 3 using a bitmap to indicate that the subframe carrying the MBMS notification message is specifically, using 6 bits, and the FDD mode corresponding indication subframes #1, #2, #3, #6, #7, #8 When the corresponding bit position is "1", that is, the subframe is selected as a subframe of the 7-bit MBMS notification message, and the TDD mode corresponds to the subframes other than the #0, #1, #5, and #6 subframes. .
  • Mode 4 the way to notify the subframe number.
  • the MBMS notification message is carried in the PDCCH of the selected subframe.
  • the MCCH repetition period and the MCCH modification period of each MBSFN area are determined as follows:
  • the radio frame corresponding to the SFN is the radio frame carrying the MCCH.
  • the repetitionPeriod is 640 ms, and it can also be expressed as 64 radio frames, which is denoted as 64 rf.
  • the MCCH is carried in a radio frame with SFN values of 0, 64, 128, 192, 256.
  • the value of SFN is specified in LTE as 0 ⁇ 1023, and the cycle is cyclic.
  • the MCCH modification period is 2560 ms, and can also be expressed as 256 radio frames, which is recorded as 256 rf. That is to say, one MCCH modification period in the MBSFN area includes four MCCH repetition periods, that is, the MCCH modification period appears on the radio frame with SFNs of 0, 256, 512..., which can also be understood as MCCH on these radio frames. It is allowed to be updated. It can be seen that the MCCH modification period only defines how many MCCH repetition periods are separated, allowing the MCCH information to be updated.
  • the radio frame corresponding to the SFN is the radio frame carrying the MCCH.
  • the repetitionPeriod is 640 ms, and it can also be expressed as 64 radio frames, which is denoted as 64 rf.
  • the MCCH is carried in the frame.
  • the value of SFN is specified as 0 ⁇ 1023 in LTE, and the cycle is cyclic.
  • the MCCH modification period is 5120 ms, which can also be expressed as 512 radio frames, which is recorded as 512rf. That is to say, an MCCH modification period in the MBSFN area includes eight MCCH repetition periods, that is, the MCCH modification period occurs on radio frames with SFNs of 0, 512, 1024..., which can also be understood as MCCH on these radio frames. It is allowed to be updated. It can be seen that the MCCH modification period only defines how many MCCH repetition periods are separated, allowing the MCCH information to be updated.
  • the cell has only one MBMS notification message for notifying whether multiple MCCHs of multiple MBSFN areas are updated at the timing of their respective modification cycles. .
  • the value of the parameter PeriodCoeff is first determined.
  • 2 or 4 is proposed.
  • the parameter is configured as 2, and the parameter is sent to the receiving end.
  • the parameter can be fixed to a certain value directly through the protocol, so that the signaling can be omitted to the receiving end, but the flexibility of the parameter value is reduced by fixing the corresponding value by the protocol.
  • the receiving end needs to determine which wireless frames and subframes carry the MBMS notification message when receiving the MBMS notification message.
  • the method is the same, here only the receiving end is taken as an example.
  • the receiving end can know that the cell currently belongs to those MBSFN areas in each cell, and knows the value of each MCCH modification period, MCCH repetition period, and MCCH offset (offset) in each MBSFN area.
  • SFN mod (MCCHMP/PeriodCoeff) NotificationOffset.
  • MCCHMP takes the smallest MCCH modification period in the MBSFN1 and MBSFN2 areas.
  • the MCCH modification period of the MBSFN1 area is the smallest, and the value is 256rf.
  • the value of the parameter NotificationOffset is used when the cell is overlapped by multiple MBSFNs.
  • SFN mod repetitionPeriod the same value of the offset in the smallest equation of the repetitionPeriod in offset; or, when the cell is overlapped by multiple MBSFNs
  • SFN mod repetitionPeriod offset the same value in offset.
  • the radio frames of 128, 256, 512... carry the MBMS notification message, and the MBMS notification message is sent twice in each MCCH modification period.
  • the current cell is simultaneously covered by MBSFN1 and MBSFN2, and then the MCCHMP parameter in Equation 1 for determining the radio frame carrying the MBMS notification message according to the present invention must be selected to be the smallest, which is the MBSFN1 area in this embodiment, and the value is It is 256rf. Both the sender and the receiver need to comply with the selection of the minimum MCCH modification period for transmission and reception.
  • the receiving end knows, by the method provided by the present invention, that the MBMS notification message is carried on the radio frame, and how is the receiving end received, and for a receiving end that is only interested in the MBMS service in the MBSFN1 area, then the MCCH modification in the MBSFN1 area is performed. Receive the corresponding period MBMS notification message, because the MBMS notification message is sent twice in each MCCH modification period in the MBSFN1 area, the receiving end can receive 2 times, that is, receive it every time; or receive the first MBMS notification message correctly. With the update of the MCCH, the second MBMS notification message is not received.
  • the corresponding MBMS notification message is received in the MCCH modification period of the MBSFN2 area, because the MBMS notification message is actually sent 4 times in each MCCH modification period in the MBSFN2 area, because the MCCH modification period of the MBSFN2 area is twice the modification period of the MBSFN1 area.
  • the receiving end can receive 4 times, that is, receive it every time; or receive the first MBMS notification message to correctly know the MCCH update status, and the next 3 MBMS notification messages are not received.
  • the MBMS notification messages on those radio frames are active for that MCCH modification period.
  • the MBMS notification messages on those radio frames are active for that MCCH modification period.
  • the MBMS notification message of other locations and its corresponding MCCH modification period are analogous.
  • the MBMS notification messages on those radio frames are active for that MCCH modification period.
  • the MBMS notification message of other locations and its corresponding MCCH modification period are analogous.
  • the MBMS notification message and the indicated MCCH modification period corresponding rule may be fixed by a protocol.
  • the proposed MBSFN1 and MBSFN2 respectively have two corresponding rules, for example, fixed to the first type or the second type by a protocol.
  • the first one is fixed, that is, for the MBSFN1 area, according to the embodiment, it is recommended that the MBMS notification message on the radio frame with the SFN of 128 and 256 be the MCCH modification period timing on the radio frame indicating that the SFN is 256.
  • the MCCH information at the location is updated; for the MBSFN2 area, according to the embodiment, it is recommended that the MBMS notification message on the radio frame with the SFN of 256, 512 is the MCCH at the timing of the MCCH modification period on the radio frame indicating that the SFN is 512. Whether the information has been updated
  • a method of determining a subframe carrying an MBMS notification message in an already determined radio frame is also provided.
  • Manner 1 The MBMS notification message is carried in the PDCCH of the subframe carrying the MCCH.
  • the MCCH is carried in multiple subframes, it is recommended to carry the MBMS notification message in the first subframe carrying the MCCH.
  • Mode 2 using the subframe fixed in the wireless frame, that is, the subframe position is fixed by the protocol. For example, a subframe with a subframe number of #1 is fixed.
  • Mode 3 using a bitmap to indicate that the subframe carrying the MBMS notification message is specifically, using 6 bits, and the FDD mode corresponding to the indication subframes #1, #2, #3, #6, #7, #8, when corresponding The bit position "1" indicates that the subframe is selected as the subframe carrying the MBMS notification message, and the TDD mode corresponds to the subframes other than the #0, #1, #5, and #6 subframes.
  • Mode 4 the way to notify the subframe number. When the transmission subframe number is specifically used, 3 bits are used, and 6 values are selected to describe 6 subframes.
  • the MBMS notification message is carried in the selected subframe.
  • the present invention further provides a determining and transmitting end of a radio frame carrying a multicast broadcast multicast service notification message, as shown in FIG. 3, including a configuration module, and determining a radio frame module; a configuration module, configured to configure a multicast control channel (MCCH) modification period (MCCHMP) and a periodic coefficient (PeriodCoeff) and a notification message offset (NotificationOffset);
  • MCCH multicast control channel
  • MCCHMP multicast control channel modification period
  • PeriodCoeff periodic coefficient
  • NotificationOffset notification message offset
  • Determining a radio frame module configured to determine, when the system frame number (SFN) pair MCCHMP and PeriodCoeff ratio is equal to NotificationOffset, the radio frame corresponding to the SFN value is a radio frame that sends an MBMS notification message.
  • SFN system frame number
  • the determining the radio frame module further determines that the radio frame corresponding to the following equation is a radio frame corresponding to the SFN,
  • the SFN is a system frame number specified by the LTE system, and the value ranges from 0 to 1023.
  • the MCCHMP indicates an MCCH modification period, and the PeriodCoeff indicates the number of times the MBMS notification message is sent during an MCCH modification period, and the NotificationOffset is an offset.
  • the MCCHMP value is the MCCH modification period of the MBSFN area, and the value of the NotificationOffset is the same as the offset value of the MBSFN area;
  • the PeriodCoeff value is less than or equal to the ratio of the value of the MCCH modification period of the MBSFN area to the value of the MCCH repetition period of the MBSFN area.
  • the value of the MCCHMP is the value of the MCCH modification period of the minimum MBSFN area of the MCCH modification period in the multiple MBSFN areas when the cell is overlapped by multiple MBSFNs.
  • the PeriodCoeff value is used when the cell is overlapped by multiple MBSFNs.
  • the ratio of the value of the MCCH tampering period of each MBSFN area covering the cell to the value of the MCCH repetition period of the MBSFN area is less than or equal to.
  • the value of the offset corresponding to the MBSFN area in which the MCCH repetition period is the smallest in the plurality of MBSFN areas is the value of the offset corresponding to the MBSFN area in the MBSFN area;
  • the value of the offset of the MBSFN area in which the MCCH modification period is the smallest in the plurality of MBSFN areas is the value of the offset corresponding to the MBSFN area in which the MCCH modification period is the smallest.
  • the foregoing determining the radio frame module further includes a subframe module of one of the following, a first subframe module, configured to determine, in the radio frame, a subframe that carries an MBMS notification message, where: a subframe that carries an MCCH is used to carry an MBMS notification message;
  • a second subframe module configured to use a fixed subframe to carry an MBMS notification message by using a protocol
  • a third subframe module configured to use a bitmap to indicate a subframe that carries the MBMS notification message
  • the fourth subframe module is configured to use the transmit subframe number.
  • the present invention implements location determination of an MBMS notification message with a minimum signaling overhead; can implement location determination of an MBMS notification message in a cell that does not overlap, and can also be applied to a location of an MBMS notification message in an overlapping coverage cell. Therefore, the radio frame for transmitting the MBMS notification message is obtained with less MCCH information, so that the terminal receiving and parsing process is more power-saving.

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Abstract

本发明公开了一种承载多播广播组播业务通知消息无线帧的确定方法,包括:发送端配置多播控制信道(MCCH)修改周期(MCCHMP)和周期系数(PeriodCoeff)及通知消息偏移(NotificationOffset),当系统帧号(SFN)对MCCHMP与PeriodCoeff比值求模等于NotificationOffset时,所述SFN值对应的无线帧为发送多媒体广播组播业务(MBMS)通知消息的无线帧。本发明以较少MCCH信息,获得发送MBMS通知消息的无线帧,使终端接收和解析过程比较省电。

Description

一种承载多播广播组播业务通知消息无线帧的
确定方法及发送端
技术领域
本发明涉及长期演进(Long Term Evolution, LTE ) 系统, 尤其涉及在多 媒体广播组播业务单频网络 ( Multimedia Broadcast multicast service Single Frequency Network, MBSFN ) 区域的承载多媒体广播组播业务( Multimedia Broadcast Multicast Service , MBMS )通知消息的位置方法。
背景技术
随着互联网的迅猛发展和大屏幕多功能手机的普及, 出现了大量移动数 据多媒体业务和各种高带宽多媒体业务, 例如: 视频会议、 电视广播、 视频 点播、 视频广告、 网上教育、 互动游戏等, 不仅满足了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。 这些移动数据多媒体 业务要求多个用户能够同时接收相同数据, 与一般的数据业务相比, 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, 简称为 3GPP )提出了 MBMS业务, 该业务是一种从一个数据源向多个目标传送数据的技术, 实现 了网络(包括核心网和接入网) 资源的共享, 提高了网络资源 (尤其是空中 接口资源) 的利用率。 3GPP定义的 MBMS业务不仅能够实现纯文本低速率 的消息类组播和广播, 还能够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, 为第三代数字通信( 3rd Generation, 3G ) 的发展提供了更好的业务前景。
MBMS业务的特点是业务的数据量大, 终端接收时持续时间长, 平均数 据率恒定。上述特点决定了 MBMS业务的调度,控制信令配置都是半静态的, 即 MBMS业务的调度信息, 控制信令信息都是"长期"保持不变的, 这样每个 多播控制信道(Multicast Control Channel, MCCH )信息的周期系统侧发送一 个没有变化的信息 (始终发送是因为随时都可能有新用户接入) 。 这样对于 一个已经接收了 MCCH信息的终端来说,如果每次都去接收一个没有发生变 化的 MCCH信息, 这样会造成终端费电, 因为 MCCH信息量大, 接收和解 析过程比较耗电。
于是提出了引入 MBMS通知消息, 通知消息 (英文有公司称为 MCCH change notification , 或 MBMS notification Indicator , 或 MBMS notification information,或 MBMS notification,中文有公司称为 MBMS通知消息、 MBMS 通知信息或 MBMS指示信息等 ,本文中文以 MBMS通知消息,英文以 MBMS notification information为例) , 用少量的信息来描述即将发送的 MCCH信息 与上一次发送的 MCCH信息比较是否发生了更新, 已经接入的终端只需要监 听少量的 MBMS通知消息信息, 根据 MBMS通知消息终端再去决定是否接 收即将到来 MCCH信息。 目前 LTE R9已经确定了引入 MBMS通知消息,哪 MBMS通知消息应该被承载于那些无线帧和子帧呢? 目前没有明确, 是需要 通过一种方法来进行描述和分配的。
发明内容
本发明要解决上述的技术问题, 提供一种承载多播广播组播业务通知消 息无线帧的确定方法,利用系统原有参数来确定 MBMS通知消息所在的无线 帧和子帧, 不需要发送任何信令, 只需要通过协议约定即可, 发送端和接收 端通过协议约定的方式,完成 MBMS通知消息的发送和接收,以实现 MBMS 通知消息的发送。
一种承载多播广播组播业务通知消息无线帧的确定方法, 包括: 发送端配置多播控制信道(MCCH )修改周期(MCCHMP )和周期系数
( PeriodCoeff )及通知消息偏移 ( NotificationOffset ) , 当系统帧号 (SFN ) 对 MCCHMP与 PeriodCoeff比值求模等于 NotificationOffset时, 所述 SFN值 对应的无线帧为发送 MBMS通知消息的无线帧;
其中, 当小区只有一个 MBSFN区域覆盖时, 所述 MCCHMP取值为该 MBSFN区域的 MCCH修改周期的取值; 当小区被多个 MBSFN重叠覆盖时, 所述 MCCHMP取值为多个 MBSFN区域中 MCCH修改周期最小的 MBSFN 区域的 MCCH修改周期的取值; 所述 PeriodCoeff表示一个 MCCH修改周期 内发送 MBMS通知消息的次数。 上述 SFN对 MCCHMP与 PeriodCoeff比值求模等于 NotificationOffset的 关系式为: SFN mod ( MCCHMP/PeriodCoeff ) = NotificationOffset
其中, SFN是 LTE系统规定的系统帧号, 取值范围是从 0~1023; 所述 MCCHMP表示 MCCH修改周期, NotificationOffset为偏移。
其中, 当小区只有一个 MBSFN区域覆盖时, 所述 NotificationOffset取值 和该 MBSFN区域中的 offset取值相同;
所述 PeriodCoeff取值小于或等于该 MBSFN区域的 MCCH修改周期的取 值与该 MBSFN区域的 MCCH重复周期的取值的比值。
其中, 当小区被多个 MBSFN重叠覆盖时, PeriodCoeff取值为小于或等 于覆盖该小区的每个 MBSFN区域的 MCCH修改周期的取值与该 MBSFN区 域的 MCCH重复周期取值的比值。
其中, 当小区被多个 MBSFN重叠覆盖时, 所述 NotificationOffset取值选 择所述多个 MBSFN区域中 MCCH重复周期最小的 MBSFN区域所对应 offset 取值;
或者, 当小区被多个 MBSFN重叠覆盖时, 所述 NotificationOffset取值选 择所述多个 MBSFN区域中 MCCH修改周期最小的 MBSFN区域所对应 offset 取值。
所述方法还包括: 在所述的无线帧内确定承载 MBMS通知消息的子帧, 所述在所述的无线帧内确定承载 MBMS 通知消息的子帧包括: 使用承载 MCCH的子帧承载 MBMS通知消息;
或者, 通过协议使用固定子帧承载 MBMS通知消息; 或者, 使用 bitmap 的方式来指示承载 MBMS通知消息的子帧; 或者, 使用发送子帧编号。
其中, 所述使用承载 MCCH的子帧承载 MBMS通知消息的步骤包括: 在承载 MCCH的第一个子帧中发送 MBMS通知消息;
所述使用 bitmap的方式来指示承载 MBMS通知消息的子帧包括:使用 6 比特, FDD模式对应指示子帧 #1、 #2、 #3、 #6、 #7、 #8, 当相应的比特位置 "1", 表示该子帧被选定为承载 MBMS通知消息的子帧, TDD模式对应指示 除 #0、 #1、 #5、 #6子帧以外的子帧; 当使用发送子帧编号包括: 使用 3比特, 选取其中 6种取值描述 6个子 帧, FDD模式下 "000"指示子帧 #1 , "001 "指示子帧 #2, "010"指示子帧 #3 , "011" 指示子帧 #6, "100"指示子帧 #7, "101"指示子帧 #8; 以及
TDD模式下 "000"指示子帧 #2, "001"指示子帧 #3 , "010"指示子帧 #4, "011 "指示子帧 #7, "100"指示子帧 #8, "101"指示子帧 #9。
本发明还提供了一种承载多播广播组播业务通知消息无线帧的确定发送 端, 包括配置模块、 确定无线帧模块;
配置模块设置为: 配置多播控制信道(MCCH )修改周期 (MCCHMP ) 和周期系数 ( PeriodCoeff)及通知消息偏移 (NotificationOffset ) ;
确定无线帧模块设置为: 当系统帧号(SFN )对 MCCHMP与 PeriodCoeff 比值求模等于 NotificationOffset 时, 所述 SFN值对应的无线帧确定为发送 MBMS通知消息的无线帧;
其中, 当小区只有一个 MBSFN区域覆盖时, 所述 MCCHMP取值为该 MBSFN区域的 MCCH修改周期的取值; 当小区被多个 MBSFN重叠覆盖时, 所述 MCCHMP取值为多个 MBSFN区域中 MCCH修改周期最小的 MBSFN 区域的 MCCH修改周期的取值; 所述 PeriodCoeff表示一个 MCCH修改周期 内发送 MBMS通知消息的次数。
其中, 所述确定无线帧模块还设置为: 为满足如下等式的无线帧确定为 SFN对应的无线帧,
SFN mod ( MCCHMP/PeriodCoeff ) = NotificationOffset
其中, SFN是 LTE系统规定的系统帧号, 取值范围是从 0~1023; 所述 MCCHMP表示 MCCH修改周期, 所述 PeriodCoeff表示一个 MCCH修改周 期内发送 MBMS通知消息的次数, NotificationOffset为偏移。
其中, 当小区只有一个 MBSFN区域覆盖时, 所述 NotificationOffset取值 和该 MBSFN区域中的 offset取值相同; 以及
所述 PeriodCoeff取值小于或等于该 MBSFN区域的 MCCH修改周期的取 值与该 MBSFN区域的 MCCH重复周期的取值的比值。
当小区被多个 MBSFN重叠覆盖时, PeriodCoeff取值为小于或等于覆盖 该小区的每个 MBSFN区域的 MCCH 爹改周期的取值与该 MBSFN 区域的 MCCH重复周期取值的比值。
其中, 当小区被多个 MBSFN重叠覆盖时, 所述 NotificationOffset取值选 择所述多个 MBSFN区域中 MCCH重复周期最小的 MBSFN区域所对应 offset 取值
或者, 当小区被多个 MBSFN重叠覆盖时, 所述 NotificationOffset取值选 择所述多个 MBSFN区域中 MCCH修改周期最小的 MBSFN区域所对应 offset 取值。
其中, 上述确定无线帧模块还包括以下之一的子帧模块,
第一子帧模块,设置为: 所述的无线帧内确定承载 MBMS通知消息的子 帧, 且使用承载 MCCH的子帧承载 MBMS通知消息;
第二子帧模块, 设置为: 通过协议使用固定子帧承载 MBMS通知消息; 第三子帧模块, 设置为: 使用 bitmap的方式来指示承载 MBMS通知消 息的子帧;
第四子帧模块, 设置为: 使用发送子帧编号。
釆用本发明的方法, 以最小的信令开销实现 MBMS通知消息的位置确 定; 可以在不发生重叠覆的小区实现 MBMS通知消息的位置确定, 也可以应 用于重叠覆盖的小区实现 MBMS通知消息的位置确定, 从而以较少 MCCH 信息,获得发送 MBMS通知消息的无线帧,使终端接收和解析过程比较省电。 附图概述
图 1是 MBSFN区域重叠覆盖的示意图;
图 2是承载 MBMS通知消息无线帧的确定发送端示意图。 本发明的较佳实施方式
为了更好的说明本发明, 下面结合实施例进行描述。
在 LTE R9中引入了 MBMS业务,并为每个 MBSFN区域的 MBMS业务 以 MBSFN区域为单位进行 MCCH的发送配置, 具体为 MCCH釆用重复周 期和修改周期, 一般修改周期大于重复周期, 一个修改周期内重复发送多次 MCCH信息, 并且允许 MCCH发生变化, 只有在 MCCH修改周期到来的时 候才允许 MCCH信息发生变化。
另外, LTE中为了减少接收端在每个 MCCH修改周期时机处读取没有更 新的 MCCH信息, 确定引入 MBMS通知消息, 即在每个 MCCH修改周期内 发送 MBMS通知消息, 接收端通过接收解析 MBMS通知消息来获知即将到 来的 MCCH修改周期时机处的 MCCH信息是否发生更新, 当 MBMS通知消 息告知接收端即将到来的 MCCH修改周期时机处的 MCCH信息没有更新时, 接收端可以不予接收, 否则进行接收解析。
本发明主要思想是利用等式 1 :
SFN mod ( MCCHMP/PeriodCoeff ) = NotificationOffset (等式 1 ) 来确定承载 MBMS通知消息的无线帧。等式 1中的周期系数 PeriodCoeff 表示一个 MCCH修改周期内发送 MBMS通知消息的次数, 其他参数说明参 考"发明内容"部分描述。 SFN为系统帧号, 全称为 System Frame Number。
其次, 本发明还提供了确定承载 MBMS通知消息子帧的方法, 详见"发 明内容 "部分描述。 整个发明中以无线帧为单位计数。 等式计算中各个参数均 以无线帧为单位。
实施例 1
描述没有重叠覆盖发生时的应用。
假设某一小区属于某一 MBSFN区域, 该小区只有属于该 MBSFN区域。 那么该 MBSFN区域的 MCCH重复周期 (MCCH Repetition Period, 缩写为 MCCHRP )和 MCCH修改周期( MCCH Modification Period,缩写为 MCCHMP ) 的确定如下:
满足等式: SFN mod repetitionPeriod = offset的 SFN对应的无线帧即为承 载 MCCH的无线帧, 本实施中 4叚设 repetitionPeriod为 640ms , 也可以表示为 64个无线帧, 记为 64rf。 offset取值为 0。 即满足 SFN mod 64rf= 0的 SFN取 值对应的无线帧即为承载 MCCH 的无线帧, 根据设定的参数可以获知 SFN 取值为 0、 64、 128、 192、 256…的无线帧中承载有 MCCH。 这里 SFN的取 值在 LTE中规定为 0~1023 , 周期循环。
进一步本实施里中假设 MCCH修改周期为 2560ms, 也可以表示为 256 个无线帧 ,记为 256rf。那就是说该 MBSFN区域内一个 MCCH修改周期内包 含 4个 MCCH重复周期, 即 MCCH修改周期出现在 SFN为 0、 256、 512... 的无线帧上, 也可以理解为这些无线帧上的 MCCH是允许发生更新的。 可以 看出 MCCH修改周期只是定义隔多少个 MCCH重复周期, 允许 MCCH信息 发生更新。
上述是目前 LTE中规定的, MBSFN区域内 MCCH的配置, 下面描述根 据本发明提供的方法进行承载 MBMS通知消息的无线帧的确定。
根据本发明提供的等式 1 , 首先确定参数 PeriodCoeff的取值, 本发明中 建议 2或者 4, 本实施里中把该参数配置为 2, 并且把该参数发送给接收端。 当然该参数可以直接通过协议固定为某一个数值, 这样可以省去发送信令给 接收端, 但是通过协议固定相应的降低了该参数取值的灵活性。
发送端在发送 MBMS通知消息的时候 , 接收端在接收 MBMS通知消息 的时候, 都是需要确定哪些无线帧和子帧承载 MBMS通知消息的, 两者用的 方法相同, 这里只以接收端为例。
接收端则根据等式 1 , SFN mod ( MCCHMP/PeriodCoeff ) = NotificationOffset确定承载 MBMS通知消息的无线帧。 具体为满足 SFN mod ( 256rf/2 ) = 0, 获知 SFN为 0、 128、 256、 512...的无线帧承载 MBMS通知 消息, 并且每个 MCCH修改周期内发送 2次 MBMS通知消息。
本发明中,进一步规定那些无线帧上的 MBMS通知消息是对那个 MCCH 修改周期起作用的。 可以有两种对应规则, 第一种, 建议把 SFN为 128、 256 的无线帧上的 MBMS通知消息是对应指示 SFN为 256的无线帧上的 MCCH 修改周期时机处的 MCCH信息是否发生更新; 或者, 第二种, 把 SFN为 0、 128的无线帧上的 MBMS通知消息对应指示 SFN为 256的无线帧上的( MCCH 修改周期时机处的) MCCH信息是否发生更新。其他位置的 MBMS通知消息 和其对应的 MCCH修改周期依次类推。 本实施例中选择第一种。 本实施里中,再附带给出在已经确定的无线帧中确定承载 MBMS通知消 息的子帧的方法。方式 1 ,在承载 MCCH的子帧的物理下行控制信道(Physical Downlink Control Channel, PDCCH ) 中承载 MBMS通知消息。 当 MCCH被 承载在多个子帧时, 建议把 MBMS通知消息承载于第一个承载 MCCH的子 帧中。 使用本方式, 可以不用给接收端发送信令, 只需要通过协议约定即可。 这样发送端和接收端同时遵守即可。 方式 2, 使用无线帧内固定的子帧, 即 通过协议把子帧位置固定。 例如固定使用子帧号为 #1的子帧。 使用本方式, 可以不用给接收端发送信令, 只需要通过协议约定即可。 这样发送端和接收 端同时遵守即可。 方式 3 , 使用位图 (bitmap ) 的方式来指示承载 MBMS通 知消息的子帧具体为, 使用 6比特, FDD模式对应指示子帧 #1、 #2、 #3、 #6、 #7、 #8, 当相应的比特位置" 1", 即表示该子帧被选定为 7 载 MBMS通知消 息的子帧, TDD模式对应指示除 #0、 #1、 #5、 #6子帧以外的子帧。 方式 4, 通知子帧号的方式。 当使用发送子帧编号具体为, 使用 3 比特, 选取其中 6 种取值描述 6个子帧, FDD模式下 "000"指示子帧 #1 , "001 "指示子帧 #2, "010" 指示子帧 #3 , "011 "指示子帧 #6, "100"指示子帧 #7 , "101"指示子帧 #8; TDD 模式下 "000"指示子帧 #2, "001"指示子帧 #3 , "010"指示子帧 #4, "011"指示子 帧 #7 , "100"指示子帧 #8, "101"指示子帧 #9。
上述 4 种方式确定子帧后, 均把 MBMS 通知消息承载于所选子帧的 PDCCH中。
实施例 2
描述一个小区同时被多个 MBSFN区域重叠覆盖下的应用。本实施里以 2 个 MBSFN区域重叠覆盖为例。 如图 1中的小区八。
假设某一小区同时被 2个 MBSFN区域重叠覆盖, 分别记为 MBSFN1和 MBSFN2。那么每个 MBSFN区域的 MCCH重复周期和 MCCH修改周期的确 定如下:
MBSFN1区域, 满足等式: SFN mod repetitionPeriod = offset的 SFN对应 的无线帧即为承载 MCCH的无线帧,本实施中 4叚设 repetitionPeriod为 640ms , 也可以表示为 64个无线帧, 记为 64rf。 offset取值为 0。 即满足 SFN mod 64rf = 0的 SFN取值对应的无线帧即为承载 MCCH的无线帧, 根据设定的参数可 以获知 SFN取值为 0、 64、 128、 192、 256...的无线帧中承载有 MCCH。 这 里 SFN的取值在 LTE中规定为 0~1023 , 周期循环。
进一步本实施里中假设 MCCH修改周期为 2560ms, 也可以表示为 256 个无线帧 ,记为 256rf。那就是说该 MBSFN区域内一个 MCCH修改周期内包 含 4个 MCCH重复周期, 即 MCCH修改周期出现在 SFN为 0、 256、 512... 的无线帧上, 也可以理解为这些无线帧上的 MCCH是允许发生更新的。 可以 看出 MCCH修改周期只是定义隔多少个 MCCH重复周期, 允许 MCCH信息 发生更新。
MBSFN2区域, 满足等式: SFN mod repetitionPeriod = offset的 SFN对应 的无线帧即为承载 MCCH的无线帧,本实施中假设 repetitionPeriod为 640ms , 也可以表示为 64个无线帧, 记为 64rf。 offset取值为 0。 即满足 SFN mod 64rf = 0的 SFN取值对应的无线帧即为承载 MBMS通知消息的无线帧, 根据设定 的参数可以获知 SFN取值为 0、64、128、192、256...的无线帧中承载有 MCCH。 这里 SFN的取值在 LTE中规定为 0~1023 , 周期循环。
进一步本实施里中假设 MCCH修改周期为 5120ms, 也可以表示为 512 个无线帧,记为 512rf。那就是说该 MBSFN区域内一个 MCCH修改周期内包 含 8个 MCCH重复周期, 即 MCCH修改周期出现在 SFN为 0、 512、 1024... 的无线帧上, 也可以理解为这些无线帧上的 MCCH是允许发生更新的。 可以 看出 MCCH修改周期只是定义隔多少个 MCCH重复周期, 允许 MCCH信息 发生更新。
根据目前 LTE协议的工作假设, 即使多个 MBSFN区域重叠覆盖在某一 小区, 该小区也只有一个 MBMS通知消息, 用于通知多个 MBSFN区域的多 个 MCCH在各自的修改周期时机处是否发生更新。
根据本发明提供的等式 1 , 首先确定参数 PeriodCoeff的取值, 本发明中 建议 2或者 4, 本实施里中把该参数配置为 2, 并且把该参数发送给接收端。 当然该参数可以直接通过协议固定为某一个数值, 这样可以省去发送信令给 接收端, 但是通过协议固定相应的降低了该参数取值的灵活性。
发送端在发送 MBMS通知消息的时候 , 接收端在接收 MBMS通知消息 的时候, 都是需要确定哪些无线帧和子帧承载 MBMS通知消息的, 两者用的 方法相同, 这里只以接收端为例。
接收端在每个小区是可以获知该小区目前属于那些 MBSFN区域覆盖的, 并且知道每个 MBSFN区域中各自 MCCH修改周期、 MCCH重复周期、 MCCH 偏移( offset )的取值。接收端则根据等式 1 , SFN mod ( MCCHMP/PeriodCoeff ) = NotificationOffset确定承载 MBMS通知消息的无线帧。 具体为 MCCHMP 取 MBSFNl和 MBSFN2区域中 MCCH修改周期最小的那个, 本实施里中是 MBSFNl区域的 MCCH修改周期最小, 取值为 256rf; 参数 NotificationOffset 取值, 当小区被多个 MBSFN 重叠覆盖时, NotificationOffset取所述多个 MBSFN 区域中用来描述 MCCH 被调度的无线帧的等式: SFN mod repetitionPeriod = offset中的 repetitionPeriod最小的等式中的 offset相同的值; 或者, 当小区被多个 MBSFN 重叠覆盖时, NotificationOffset取所述多个 MBSFN区域中 MCCH修改周期最小 MBSFN区域中的用来描述 MCCH被调 度的无线帧的等式: SFN mod repetitionPeriod = offset中的 offset相同值。 本 实利中,按照前者取值,由于实施例中 MBSFNl的 MCCH重复周期为 640ms, offset为 0, MBSFN2的 MCCH重复周期均为 640ms, offset为 0, 根据上述 原则当小区被多个 MBSFN重叠覆盖时, NotificationOffset取所述多个 MBSFN 区域中用来描述 MCCH被调度的无线帧的等式: SFN mod repetitionPeriod = offset 中的 repetitionPeriod 最小的等式中的 offset相同的值; 本实施例中 NotificationOffset=0。
PeriodCoeff取值为 2。 那么从 SFN mod ( 256rf/2 ) = 0 , 获知 SFN为 0、
128、 256、 512...的无线帧承载 MBMS通知消息, 并且每个 MCCH修改周期 内发送 2次 MBMS通知消息。 注意此时本小区被 MBSFNl和 MBSFN2同时 覆盖, 那么根据本发明用来确定承载 MBMS通知消息的无线帧的等式 1 中 MCCHMP参数必须选择最小的, 本实施例中即为 MBSFNl 区域的, 取值为 256rf。发送端和接收端都是需要遵守选择最小 MCCH修改周期进行发送和接 收的。
接收端通过本发明提供的方法获知了那些无线帧上承载有 MBMS通知 消息, 那么接收端如何接收呢, 对于一个只对 MBSFNl 区域内的 MBMS业 务感兴趣的接收端, 那么在 MBSFNl 区域的 MCCH修改周期内接收相应的 MBMS通知消息, 因为 MBSFN1区域内每个 MCCH修改周期内发送了 2次 MBMS通知消息, 接收端可以接收 2次, 也就是说每次都进行接收; 或者接 收第一次的 MBMS 通知消息就正确获知了 MCCH 的更新情况, 第二次的 MBMS通知消息就不用接收了。
对于一个只对 MBSFN2区域内的 MBMS业务感兴趣的接收端, 那么在
MBSFN2 区域的 MCCH修改周期内接收相应的 MBMS 通知消息, 因为 MBSFN2区域内每个 MCCH修改周期内实际发送了 4次 MBMS通知消息, 因为 MBSFN2区域的 MCCH修改周期是 MBSFN1区域的修改周期的 2倍。 接收端可以接收 4次, 也就是说每次都进行接收; 或者接收第一次的 MBMS 通知消息就正确获知了 MCCH的更新情况, 以后 3次的 MBMS通知消息就 不用接收了。
对于对 MBSFN1 和 MBSFN2 区域均感兴趣的接收端, 则每次发送的 MBMS通知消息都需要接收。
本发明中,进一步规定那些无线帧上的 MBMS通知消息是对那个 MCCH 修改周期起作用的。
对于 MBSFN1区域,依据本实施例,进一步规定那些无线帧上的 MBMS 通知消息是对那个 MCCH修改周期起作用的。可以有两种对应规则,第一种, 建议把 SFN为 128、 256的无线帧上的 MBMS通知消息是对应指示 SFN为 256的无线帧上的 MCCH修改周期时机处的 MCCH信息是否发生更新;或者, 第二种, 把 SFN为 0、 128的无线帧上的 MBMS通知消息对应指示 SFN为 256的无线帧上的 (MCCH修改周期时机处的) MCCH信息是否发生更新。 其他位置的 MBMS通知消息和其对应的 MCCH修改周期依次类推。
对于 MBSFN2区域, 进一步规定那些无线帧上的 MBMS通知消息是对 那个 MCCH修改周期起作用的。 可以有两种对应规则, 第一种, 建议把 SFN 为 256、 512的无线帧上的 MBMS通知消息是对应指示 SFN为 512的无线帧 上的 MCCH修改周期时机处的 MCCH信息是否发生更新; 或者, 第二种, 把 SFN为 0、 256的无线帧上的 MBMS通知消息对应指示 SFN为 512的无线 帧上的(MCCH修改周期时机处的) MCCH信息是否发生更新。 其他位置的 MBMS通知消息和其对应的 MCCH修改周期依次类推。 一般为了简单, 可以通过协议把 MBMS通知消息和被指示的 MCCH修 改周期对应规则固定下来,例如上述建议的 MBSFN1和 MBSFN2分别有两种 对应规则, 例如通过协议固定为第一种或者第二种。 本实施例中固定为第一 种, 即对于 MBSFN1区域, 依据本实施例, 建议把 SFN为 128、 256的无线 帧上的 MBMS通知消息是对应指示 SFN为 256的无线帧上的 MCCH修改周 期时机处的 MCCH信息是否发生更新; 对于 MBSFN2区域, 依据本实施例, 建议把 SFN为 256、 512的无线帧上的 MBMS通知消息是对应指示 SFN为 512的无线帧上的 MCCH修改周期时机处的 MCCH信息是否发生更新
本实施里中,再附带给出在已经确定的无线帧中确定承载 MBMS通知消 息的子帧的方法。 方式 1 , 在承载 MCCH的子帧的 PDCCH中承载 MBMS通 知消息。 当 MCCH被承载在多个子帧时, 建议把 MBMS通知消息承载于第 一个承载 MCCH的子帧中。 使用本方式, 可以不用给接收端发送信令, 只需 要通过协议约定即可。 这样发送端和接收端同时遵守即可。 方式 2, 使用无 线帧内固定的子帧, 即通过协议把子帧位置固定。 例如固定使用子帧号为 #1 的子帧。 使用本方式, 可以不用给接收端发送信令, 只需要通过协议约定即 可。 这样发送端和接收端同时遵守即可。 方式 3 , 使用 bitmap的方式来指示 承载 MBMS通知消息的子帧具体为,使用 6比特, FDD模式对应指示子帧 #1、 #2、 #3、 #6、 #7、 #8 , 当相应的比特位置" 1", 即表示该子帧被选定为承载 MBMS通知消息的子帧, TDD模式对应指示除 #0、 #1、 #5、 #6子帧以外的 子帧。 方式 4, 通知子帧号的方式。 当使用发送子帧编号具体为, 使用 3 比 特, 选取其中 6种取值描述 6个子帧, FDD模式下 "000"指示子帧 #1 , "001" 指示子帧 #2, "010"指示子帧 #3 , "011 "指示子帧 #6, "100"指示子帧 #7 , "101" 指示子帧 #8; TDD模式下 "000"指示子帧 #2, "001"指示子帧 #3 , "010"指示子 帧 #4, "011 "指示子帧 #7 , "100"指示子帧 #8, "101"指示子帧 #9。
上述 4 种方式确定子帧后, 均把 MBMS 通知消息承载于所选子帧的
PDCCH中。
实施例 3
本发明还提供了一种承载多播广播组播业务通知消息无线帧的确定发送 端如图 3所示, 包括配置模块、 确定无线帧模块; 配置模块, 用于配置多播控制信道(MCCH )修改周期(MCCHMP )和 周期系数(PeriodCoeff)及通知消息偏移 ( NotificationOffset ) ;
确定无线帧模块, 用于当系统帧号 (SFN )对 MCCHMP与 PeriodCoeff 比值求模等于 NotificationOffset 时, 所述 SFN值对应的无线帧确定为发送 MBMS通知消息的无线帧。
其中,所述确定无线帧模块,进一步为满足如下等式的无线帧确定为 SFN 对应的无线帧,
SFN mod ( MCCHMP/PeriodCoeff ) = NotificationOffset
其中, SFN是 LTE系统规定的系统帧号, 取值范围是从 0~1023; 所述 MCCHMP表示 MCCH修改周期, 所述 PeriodCoeff表示一个 MCCH修改周 期内发送 MBMS通知消息的次数, NotificationOffset为偏移。
其中, 当小区只有一个 MBSFN区域覆盖时, 所述 MCCHMP取值为该 MBSFN区域的 MCCH修改周期,所述 NotificationOffset取值和该 MBSFN区 域中的 offset取值相同; 进一步的
所述 PeriodCoeff取值小于或等于该 MBSFN区域的 MCCH修改周期的取 值与该 MBSFN区域的 MCCH重复周期的取值的比值。
其中, 当小区被多个 MBSFN重叠覆盖时, 所述 MCCHMP取值为多个 MBSFN区域中 MCCH修改周期最小 MBSFN区域的 MCCH修改周期的取值; 当小区被多个 MBSFN重叠覆盖时, PeriodCoeff取值为小于或等于覆盖 该小区的每个 MBSFN区域的 MCCH 爹改周期的取值与该 MBSFN 区域的 MCCH重复周期取值的比值。
其中, 当小区被多个 MBSFN重叠覆盖时, 所述 NotificationOffset取值选 择所述多个 MBSFN区域中 MCCH重复周期最小的 MBSFN区域所对应 offset 取值;
或者, 当小区被多个 MBSFN重叠覆盖时, 所述 NotificationOffset取值选 择所述多个 MBSFN区域中 MCCH修改周期最小的 MBSFN区域所对应 offset 取值。
其中, 上述确定无线帧模块还包括以下之一的子帧模块, 第一子帧模块, 用于所述的无线帧内确定承载 MBMS通知消息的子帧, 具体为: 使用承载 MCCH的子帧承载 MBMS通知消息;
第二子帧模块, 用于通过协议使用固定子帧承载 MBMS通知消息; 第三子帧模块, 用于使用 bitmap的方式来指示承载 MBMS通知消息的 子帧;
第四子帧模块, 用于使用发送子帧编号。
上述实施例 1、 2、 3中, 发送端在配置 MCCH重复周期、 MCCH修改周 期、 以及 PeriodCoeff的取值时, 最佳情况下应该遵守下面的原则: 当小区被 多个 MBSFN重叠覆盖时, PeriodCoeff取值为小于或等于覆盖该小区的每个 MBSFN区域的 MCCH修改周期的取值与该 MBSFN区域的 MCCH重复周期 取值的比值; 或者当小区仅被一个 MBSFN重叠覆盖时, 所述 PeriodCoeff 取值小于或等于该 MBSFN区域的 MCCH修改周期的取值与该 MBSFN区域 的 MCCH重复周期的取值的比值。
当然, 以上只是本发明的一种具体的实施方法, 本发明并不仅局限在上 述的具体方法上, 在不背离本发明精神及其实质的情况下, 熟悉本领域的技 术人员可根据本发明做出各种相应的改变和变形, 但这些相应的改变和变形 都应属于本发明所附的权利要求的保护范围。
工业实用性 本发明以最小的信令开销实现 MBMS通知消息的位置确定;可以在不发 生重叠覆的小区实现 MBMS通知消息的位置确定,也可以应用于重叠覆盖的 小区实现 MBMS通知消息的位置确定, 从而以较少 MCCH信息, 获得发送 MBMS通知消息的无线帧, 使终端接收和解析过程比较省电。

Claims

一种承载多播广播组播业务通知消息无线帧的确定方法及发送端
1、 一种承载多播广播组播业务通知消息无线帧的确定方法, 包括: 发送端配置多播控制信道(MCCH )修改周期(MCCHMP )和周期系数 ( PeriodCoeff )及通知消息偏移 (NotificationOffset ) , 当系统帧号 (SFN ) 对 MCCHMP与 PeriodCoeff比值求模等于 NotificationOffset时, 所述 SFN值 对应的无线帧为发送多媒体广播组播业务 (MBMS)通知消息的无线帧;
其中, 当小区只有一个 MBSFN区域覆盖时, 所述 MCCHMP取值为该 MBSFN区域的 MCCH修改周期的取值; 当小区被多个 MBSFN重叠覆盖时, 所述 MCCHMP取值为多个 MBSFN区域中 MCCH修改周期最小的 MBSFN 区域的 MCCH修改周期的取值;
所述 PeriodCoeff表示一个 MCCH修改周期内发送 MBMS通知消息的次 数。
2、 根据权利要求 1 所述的方法, 其中, 所述 SFN对 MCCHMP 与 PeriodCoeff比值求模等于 NotificationOffset的关系式为:
SFN mod ( MCCHMP/PeriodCoeff ) = NotificationOffset
其中, SFN是 LTE系统规定的系统帧号, 取值范围是从 0~1023; 所述 MCCHMP表示 MCCH修改周期, NotificationOffset为偏移。
3、 根据权利要求 1或 2所述的方法, 其中, 当小区只有一个 MBSFN区 域覆盖时,所述 NotificationOffset取值和该 MBSFN区域中的 offset取值相同; 所述 PeriodCoeff取值小于或等于该 MBSFN区域的 MCCH修改周期的取 值与该 MBSFN区域的 MCCH重复周期的取值的比值。
4、 根据权利要求 1或 2中所述的方法, 其中,
当小区被多个 MBSFN重叠覆盖时, PeriodCoeff取值为小于或等于覆盖 该小区的每个 MBSFN区域的 MCCH 爹改周期的取值与该 MBSFN 区域的 MCCH重复周期取值的比值。
5、 根据权利要求 1或 2所述的方法, 其中, 当小区被多个 MBSFN重叠 覆盖时, 所述 NotificationOffset取值选择所述多个 MBSFN区域中 MCCH重 复周期最小的 MBSFN区域所对应 offset取值;
或者, 当小区被多个 MBSFN重叠覆盖时, 所述 NotificationOffset取值选 择所述多个 MBSFN区域中 MCCH修改周期最小的 MBSFN区域所对应 offset 取值。
6、 根据权利要求 3、 4、 5中任一项所述的方法, 所述方法还包括: 在所 述的无线帧内确定承载 MBMS通知消息的子帧,所述在所述的无线帧内确定 承载 MBMS通知消息的子帧包括: 使用承载 MCCH的子帧承载 MBMS通知 消息;
或者, 通过协议使用固定子帧承载 MBMS通知消息;
或者, 使用位图 (bitmap ) 的方式来指示承载 MBMS通知消息的子帧; 或者, 使用发送子帧编号。
7、 根据权利要求 6所述的方法, 其中, 所述使用承载 MCCH的子帧承 载 MBMS通知消息的步骤包括: 在承载 MCCH的第一个子帧中发送 MBMS 通知消息;
所述使用 bitmap的方式来指示承载 MBMS通知消息的子帧包括:使用 6 比特, FDD模式对应指示子帧 #1、 #2、 #3、 #6、 #7、 #8, 当相应的比特位置 "1" , 表示该子帧被选定为承载 MBMS通知消息的子帧, TDD模式对应指 示除 #0、 #1、 #5、 #6子帧以外的子帧;
使用发送子帧编号包括: 使用 3比特, 选取其中 6种取值描述 6个子帧, FDD模式下 "000" 指示子帧 #1 , "001" 指示子帧 #2, "010" 指示子帧 #3 , "011" 指示子帧 #6, "100" 指示子帧 #7, "101" 指示子帧 #8; 以及
TDD模式下 "000" 指示子帧 #2, "001" 指示子帧 #3 , "010" 指示子 帧 #4, "011" 指示子帧 #7, "100" 指示子帧 #8, "101" 指示子帧 #9。
8、一种承载多播广播组播业务通知消息无线帧的确定发送端, 包括配置 模块、 确定无线帧模块;
所述配置模块设置为:配置多播控制信道( MCCH )修改周期( MCCHMP ) 和周期系数 ( PeriodCoeff)及通知消息偏移 (NotificationOffset ) ;
所述确定无线帧模块设置为: 当系统帧号 (SFN ) 对 MCCHMP 与 PeriodCoeff比值求模等于 NotificationOffset时 , 所述 SFN值对应的无线帧确 定为发送多播广播组播业务 (MBMS)通知消息的无线帧;
其中, 当小区只有一个 MBSFN区域覆盖时, 所述 MCCHMP取值为该 MBSFN区域的 MCCH修改周期的取值; 当小区被多个 MBSFN重叠覆盖时, 所述 MCCHMP取值为多个 MBSFN区域中 MCCH修改周期最小的 MBSFN 区域的 MCCH修改周期的取值;
所述 PeriodCoeff表示一个 MCCH修改周期内发送 MBMS通知消息的次 数。
9、 根据权利要求 8 的发送端, 其中, 所述确定无线帧模块还设置为: 为满足下列等式的无线帧确定为 SFN对应的无线帧,
SFN mod ( MCCHMP/PeriodCoeff ) = NotificationOffset
其中, 是 LTE系统规定的系统帧号, 取值范围是从 0~1023; 所述 MCCHMP表示 MCCH修改周期, NotificationOffset为偏移。
10、 根据权利要求 8或 9 的发送端, 其中, 当小区只有一个 MBSFN区 域覆盖时,所述 NotificationOffset取值和该 MBSFN区域中的 offset取值相同; 以及
所述 PeriodCoeff取值小于或等于该 MBSFN区域的 MCCH修改周期的取 值与该 MBSFN区域的 MCCH重复周期的取值的比值。
11、 根据权利要求 8或 9 的发送端, 其中,
当小区被多个 MBSFN重叠覆盖时, PeriodCoeff取值为小于或等于覆盖 该小区的每个 MBSFN区域的 MCCH 爹改周期的取值与该 MBSFN 区域的 MCCH重复周期取值的比值。
12、 根据权利要求 8或 9 的发送端, 其中, 当小区被多个 MBSFN重叠 覆盖时, 所述 NotificationOffset取值选择所述多个 MBSFN区域中 MCCH重 复周期最小的 MBSFN区域所对应 offset取值;
或者, 当小区被多个 MBSFN重叠覆盖时, 所述 NotificationOffset取值选 择所述多个 MBSFN区域中 MCCH修改周期最小的 MBSFN区域所对应 offset 取值。
13、 根据权利要求 10、 11、 12 中任一项所述的发送端, 其中, 所述确 定无线帧模块还包括以下之一的子帧模块,
第一子帧模块,设置为: 所述的无线帧内确定承载 MBMS通知消息的子 帧, 且使用承载 MCCH的子帧承载 MBMS通知消息;
第二子帧模块, 设置为: 通过协议使用固定子帧承载 MBMS通知消息; 第三子帧模块, 设置为: 使用位图 (bitmap ) 的方式来指示承载 MBMS 通知消息的子帧;
第四子帧模块, 设置为: 使用发送子帧编号。
PCT/CN2010/078370 2009-11-06 2010-11-03 一种承载多播广播组播业务通知消息无线帧的确定方法及发送端 WO2011054291A1 (zh)

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