WO2010124415A1 - 无线网络中的广播和/或组播的通信方法及其装置 - Google Patents

无线网络中的广播和/或组播的通信方法及其装置 Download PDF

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Publication number
WO2010124415A1
WO2010124415A1 PCT/CN2009/000459 CN2009000459W WO2010124415A1 WO 2010124415 A1 WO2010124415 A1 WO 2010124415A1 CN 2009000459 W CN2009000459 W CN 2009000459W WO 2010124415 A1 WO2010124415 A1 WO 2010124415A1
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WIPO (PCT)
Prior art keywords
subframe
multicast
scheduling period
broadcast
transmission
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PCT/CN2009/000459
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English (en)
French (fr)
Inventor
王河
陈宇
Original Assignee
上海贝尔股份有限公司
阿尔卡特朗讯
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to PCT/CN2009/000459 priority Critical patent/WO2010124415A1/zh
Priority to JP2012507560A priority patent/JP5442106B2/ja
Priority to BRPI0925335-1A priority patent/BRPI0925335B1/pt
Priority to CN200980155806.5A priority patent/CN102301751B/zh
Priority to EP09843827.8A priority patent/EP2426957A4/en
Priority to KR1020117025713A priority patent/KR101343307B1/ko
Priority to US13/266,746 priority patent/US8989204B2/en
Publication of WO2010124415A1 publication Critical patent/WO2010124415A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/30Resource management for broadcast services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12Messaging; Mailboxes; Announcements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446Resources in time domain, e.g. slots or frames
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/12Wireless traffic scheduling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/231Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the layers above the physical layer, e.g. RRC or MAC-CE signalling

Definitions

  • the present invention relates to a wireless communication network, and more particularly to a communication method and apparatus for broadcasting and/or multicasting in a wireless network.
  • Enhanced Multimedia Broadcast Multicast Service eMBMS
  • MBSFN Multimedia Broadcast Multicast Service Single Frequency Network
  • the MBMS services are simultaneously transmitted by using the same time-frequency resources, so that the signals of the MBMS services of the respective cells can be naturally superimposed on each other in the air, and the radio frequency (RF) combining gain is provided to the user equipment, so that the MBMS service data is received and extracted.
  • RF radio frequency
  • Different MBMS services with the same QoS can be statistically multiplexed (SM) and transmitted in the same MCH (multicast channel). These services that can be statistically multiplexed are defined as a "Service Bundle".
  • a single, non-statistically multiplexed service can be thought of as a single business package containing only one service. In the scheduling process, a business package can be regarded as a business.
  • MCE Multicast Coordination Entity
  • MSP multicast channel allocation scheme
  • MCS transmission priority and coding and modulation scheme
  • the number of subframes actually occupied by the service may be smaller than the number of subframes allocated by the MCE and reserved in the MSAP. Therefore, in order to make better use of what is not actually occupied Sub-frames, to improve resource utilization, in contrast to the aforementioned MCE for semi-static subframe allocation, the wireless system also relies on the real-time fluctuation of the data volume of the eMBMS service data, for example, 320 ms as a scheduling period, for each period of time
  • the amount of resources used for data transmission, that is, the number of subframes is dynamically and MAC layer-scheduled.
  • the granularity of scheduling is in units of subframes. This real-time processing can be done by MAC dynamic scheduling in each scheduling cycle.
  • each service in statistical multiplexing is continuously transmitted. Padding is only appended to the last subframe of each MCH in the scheduling period. The remaining subframes that are discovered after scheduling and are not occupied by the actual transmission of the MBMS service can be used for other services such as unicast.
  • Figure 1 shows an example of MBMS dynamic scheduling based on MSAP.
  • the standard specifies that subframes 0, 4, 5, and 9 cannot be defined as MBSFN.
  • MBSFN Multicast broadcast single frequency network
  • the wireless system determines the MBSFN transmission subframe allocation as subframes 1, 2, and 3 of each frame; and, the wireless system determines each scheduling period.
  • the first ten frames can be used to carry MBSFN transmission subframes.
  • the total number of subframes available for MCE for semi-static allocation is 30 in this 320ms scheduling period.
  • the subframe occupied by the MSAP starts from the first frame and sequentially occupies MBSFN subframes in consecutive frames.
  • a statistical multiplexing consists of three services SI, S2 and S3, which form a service package ⁇ SI, S2, S3 ⁇ .
  • the MCE calculates 8 subframes for transmitting the three services, as shown in FIG. 1, namely, the first radio frame and the second radio frame, the first, second, and third. Subframe, the first and second subframes of the third radio frame.
  • the MCE reserves the allocation result in the MSAP and provides it to each base station and mobile terminal.
  • the base station may leave a subframe that is not actually occupied, as shown by the horizontal block in FIG.
  • the base station can allocate the subframe to services such as unicast. Padding is only appended to the last subframe of each MCH in the scheduling period, as shown by the vertical block in Figure 1.
  • MBMS dynamic scheduling has lower real-time requirements than unicast scheduling. Therefore, for the Physical Multicast Channel (PMCH), there is no dedicated downlink control channel such as the Physical Downlink Control Channel (PDCCH) corresponding to the Physical Downlink Shared Channel (PDSCH), so how to set the MBMS for each scheduling period
  • PMCH Physical Multicast Channel
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • the MAC (Media Access Control) layer did not specifically design the eMBMS service. In the 9th edition, it is required to support eMBMS correctly and efficiently, and it is particularly required to support the service multiplexing of the agreement reached in TS36.300. Therefore, the MAC layer can perform some optimizations to control the MBMS dynamic scheduling for each scheduling period. Information is provided to the user device.
  • a method for providing broadcast and/or multicast services to a user equipment in a base station of a wireless communication network includes the following steps: Determining dynamic scheduling control information of each service according to actual transmission of the broadcast and/or multicast service in one scheduling period; 11. providing the dynamic scheduling control information to the packet data unit of the medium access control Said user equipment; iii. transmitting the data of the broadcast and/or multicast service to the user equipment in the scheduling period.
  • a method for receiving broadcast and/or multicast services from a base station in a user equipment of a wireless communication network comprises the following steps: I. In media access control a packet data unit, which receives dynamic scheduling control information for a scheduling period from a broadcast and/or multicast service of the base station, where the dynamic scheduling control information indicates actual transmission of data of the service within the scheduling period. II. receiving, according to the dynamic scheduling control information, data of a broadcast and/or multicast service from the base station in the scheduling period.
  • a base station in a wireless communication network includes: determining means, configured to determine dynamic scheduling control information of each service according to actual transmission of the broadcast and/or multicast service in a scheduling period a first providing means, configured to provide the dynamic scheduling control information to the user equipment in a packet data unit of the medium access control; and sending means for using the data of the broadcast and/or multicast service And sent to the user equipment in the scheduling period.
  • an apparatus for receiving broadcast and/or multicast services from a base station in a user equipment of a wireless communication network comprising: first obtaining means, for using the medium And receiving, in the packet data unit of the access control, dynamic scheduling control information for a scheduling period of the broadcast and/or multicast service from the base station, where the dynamic scheduling control information indicates that the data of the service is in the scheduling period
  • the actual transmission within the receiving device is configured to receive data of the broadcast and/or multicast service from the base station in the scheduling period according to the dynamic scheduling control information.
  • the dynamic scheduling control information includes a sequence number of a subframe in which the service actually ends in the scheduling period is in a multicast subframe in the scheduling period, and the base station is in the form of a control element of the medium access control in each scheduling.
  • the first subframe of the cycle is sent to the user equipment and is preferably retransmitted during scheduling.
  • the base station also indicates a multicast channel allocation scheme of the subframe in which the service is scheduled to start transmission in at least one scheduling period, and the predetermined broadcast and/or multicast single frequency network transmission subframe allocation information is sent to the at least one scheduling period.
  • the user equipment enables the user equipment to determine the transmission start subframe and the transmission end subframe of the service in the scheduling period, and receive the service data sent by the base station in the corresponding subframe.
  • the communication of the dynamic scheduling control information of each scheduling period is performed in the MAC layer, and the base station eNB can notify the user equipment UE, the user equipment UE, of the result of the dynamic scheduling without requiring an additional out-of-band signaling indication.
  • the scheduling result can be correctly obtained, and the required service data is correctly received according to the scheduling result.
  • the dynamic scheduling control information includes a sequence number of the subframe in which the actual transmission of the service is ended in the scheduling period in the multicast subframe in the scheduling period, so that the length of the control information is small.
  • FIG. 1 is a schematic diagram of dynamic scheduling of eMBMS based on MSAP in a scheduling period
  • FIG. 2 is a flow chart of a method for a base station and a user equipment to perform broadcast and/or multicast service communication, in accordance with an embodiment of the present invention
  • FIG. 3 is a diagram showing the structure of eMBMS dynamic scheduling control information interacting in the form of a MAC control element according to an embodiment of the present invention
  • FIG. 4 is a frame structure of a MAC-PDU including an MBMS dynamic scheduling control information MAC control element according to an embodiment of the present invention
  • FIG. 5 is a block diagram of an apparatus for performing broadcast and/or multicast service communication between a base station and a user equipment in accordance with another embodiment of the present invention.
  • the base station eNB in a wireless MBSFN network performs MBMS communication with the user equipment UE under its jurisdiction, and the communication service may be a single service, or may be a foregoing statistics including multiple services. Multiplexing can also be a statistical multiplexing with multiple QoS differences.
  • the various situations are collectively referred to as broadcast and/or multicast service communication.
  • the scheduling period length is still 320 ms. It will be appreciated that the invention is equally applicable in the case of other scheduling period lengths, e.g., 640 ms.
  • the dynamic scheduling of eMBMS based on MSAP in one scheduling period as shown in FIG. 1 is taken as an example.
  • the MCE has already multiplexed the QoS of the ⁇ S1, S2, S3 ⁇ service according to the statistics, and determines a semi-static multicast channel subframe allocation scheme (MSP): the service includes the scheduling period. Within a plurality of scheduling periods within, each of the scheduling periods occupies 8 subframe transmissions.
  • the MSAP indicates the predetermined MBMS service transmission start subframe and the number of occupied subframes.
  • the base station eNB determines the actual transmission of the service in the scheduling period according to the real-time fluctuation of the data volume of the eMBMS service data: the statistical multiplexing of the three services actually occupies 6.5 subframes in the scheduling period, where S1 occupies the first frame of the first frame.
  • S2 occupies the first frame of the third subframe, and the second frame of the first, second and third subframes, such as As shown in the block, there are 3 subframes in total;
  • S3 occupies the 3rd subframe of the second frame and the 1st subframe of the third frame, as shown by the lower right oblique line block, occupying 1 subframe.
  • a subframe in which the base station eNB ends the predetermined transmission in the scheduling period according to the service data that is, the second subframe of the third frame, and the subframe in which the actual transmission in the scheduling period of the service data ends, that is, the third frame Subframe No.
  • subframe No. 2 of the third frame assigns a subframe that is not used for actual transmission, that is, subframe No. 2 of the third frame, to other services, such as unicast.
  • the related art of dynamic scheduling is well known in the art of the prior art, and the present invention will not be described again.
  • the base station of the other base station belongs to a multicast broadcast single frequency network area, the base station uses a unified content synchronization mechanism between the single frequency networks to determine the actual transmission of the service within the scheduling period.
  • step S2 the base station eNB determines the dynamic scheduling control information of the service according to the statistical multiplexing, that is, the actual transmission of the service in the scheduling period.
  • the dynamic scheduling control information is the sequence number of all subframes occupied by the service in all subframes during the scheduling period.
  • the 320ms scheduling period there are 320 subframes.
  • the length of each subframe number should be 9 bits, and the 7 transmission subframes need a total of 63 bits of data, which accounts for a large amount of data.
  • the dynamic scheduling control information is a subframe in which the actual transmission of the service ends in the scheduling period, that is, information related to the first subframe of the third frame.
  • the base station eNB uses the Radio Resource Control (RRC) signaling to start the service at the beginning of the scheduled transmission in at least one scheduling period including the scheduling period.
  • RRC Radio Resource Control
  • the information of the frame, and the broadcast and/or multicast single frequency network transmission subframe allocation information (MBSFN Subframe Allocation) in at least one scheduling period including the scheduling period, are provided to the user equipment UE.
  • the user equipment UE receives the information of the subframe in which the predetermined transmission starts and the transmission subframe allocation information.
  • the information of the subframe in which the predetermined transmission starts in the at least one scheduling period including the scheduling period is the foregoing MSAP scheduled by the MCE; the broadcast and/or multicast single frequency network transmission subframe allocation
  • the information is determined by the MCE, indicating which subframes in each frame are used for the MBMS service.
  • the user equipment UE learns which subframes are used for transmitting the MBMS service; and then, according to the information of the transmission start subframe and the information of the transmission end subframe, the two subframes are determined in the entire scheduling period.
  • the user equipment UE learns that all the MBMS subframes between the transmission start subframe and the transmission end subframe and the two are used for transmitting the service.
  • Subframe In a case where a plurality of MBMS services are to be transmitted in a unified scheduling period, the base station eNB transmits the information of the actual transmission end subframe and the predetermined transmission start subframe of each service to the user equipment UE, and the base station eNB also performs the service of each service. The transmission order is transmitted to the user equipment UE, so that the user equipment UE can determine the actual transmission end subframe and the predetermined transmission start subframe corresponding to each service.
  • the information of the subframe in which the actual transmission ends includes the sequence number of the subframe in which the actually transmitted subframe is in the multicast subframe within the scheduling period. Since there are only 6 subframes in each frame, that is, all subframes except 0, 4, 5, and 9 are multicast subframes, there are 192 multicast subframes in 320 ms.
  • the sequence number of the subframe in which the actual transmission ends in the multicast subframe may be 8 bits, so that the dynamic scheduling control information of each service occupies a small amount of data.
  • the base station eNB provides the dynamic scheduling control information to the user equipment UE in the MAC-PDU, that is, the packet data unit of the medium access control, without additional out-of-band signaling.
  • This embodiment reuses the MAC-PDU format defined in clause 6.2.1 of TS 36.321, which is used for the downlink synchronization channel (DL-SCH) and the uplink synchronization channel (UL-SCH).
  • this embodiment adds a new MAC control element to carry dynamic scheduling control information, which is called "MBMS Dynamic Scheduling Control Information MAC Control Element”.
  • the following table shows the LCIDs (logical channel identifiers) associated with MBMS.
  • the definition is similar to TS 26.321 of Table 6.2.1-1 for DL-SCH and is compatible with DL-SCH.
  • the LCID of the MCCH can be selected from the reserved words in the standard "01011".
  • the LCID of the "MBMS Dynamic Scheduling Control Information MAC Control Element” can also use the reserved word "11011” in the standard. All LCIDs associated with the downlink synchronization channel should be maintained and cannot be used by MBMS. However, the MCH of the MBSM service can share the identifier 00001-01010 of the logical channel of the DL-SCH.
  • the specific "MBMS dynamic scheduling control information MAC control element" may be defined as follows: It is composed of one or more decimal strings, wherein each decimal string represents information of a transmission end subframe of an MBMS service in the current scheduling period, Each decimal character string corresponds to each MBMS service—the order of which is the transmission order of each MBMS service determined by the MCE. It can be seen that the length of the control element is not fixed.
  • Fig. 3 shows the frame format of the MBMS dynamic scheduling control MAC control element, in which the end subframe number (EPI) is used to represent the information of the end subframe of each service.
  • EPI end subframe number
  • the EPI maximum is 196, and a binary sequence of one byte length can be characterized.
  • the base station eNB is in the MAC-PDU of the first subframe in the scheduling period,
  • the dynamic scheduling control information is sent to the user equipment UE in the form of a MAC control element.
  • the frame structure of the MAC-PDU is as shown in FIG. 4, and the MAC header includes subheaders corresponding to each MAC-SDU (Service Data Unit) in the MAC payload respectively; in the MAC payload, the MBMS dynamic scheduling control is first performed.
  • the information MAC control element, followed by the MAC-SDIL of each different logical channel, in addition to being transmitted in the first subframe of the scheduling period, in order to ensure correct reception of the user equipment UE, the base station eNB may also be in the actual service during the scheduling period.
  • the MBMS dynamic scheduling control information MAC control element is retransmitted at least once before transmission.
  • step S4 the user equipment UE receives the dynamic scheduling control information of the broadcast service from the base station eNB for the scheduling period in the MAC-PDU, and the dynamic scheduling control information indicates the actual transmission of the data of the service in the scheduling period.
  • the base station eNB repeatedly transmits the dynamic scheduling control information before the actual transmission of the service in the scheduling period
  • the user equipment also repeatedly receives the information.
  • the dynamic scheduling control information is a sequence number of the actual transmission end subframe of the service in the scheduling period in the multicast subframe in the scheduling period.
  • step S1 the user equipment UE receives the information of the subframe in which the predetermined transmission starts and the transmission subframe allocation information. Then, based on the foregoing manner, the user equipment UE can determine the number and location of the transmission subframes of the MBMS service in the scheduling period.
  • step S60 the user equipment UE is based on the transmission subframe allocation information, based on the reception.
  • the MBMS service transmits a start subframe and a transfer end subframe within a scheduling period. Please refer to the description in the base station section for the method of determination.
  • step S5 the base station eNB transmits the data of the MBMS service to the user equipment UE in the corresponding subframe in the scheduling period.
  • step S61 the user equipment UE receives data of the MBMS service from the base station eNB from the determined transmission start subframe to the determined transmission end subframe.
  • the base station eNB and the user equipment UE repeat the above steps. It is worth noting that in the actual network, the subframes from which the transmission subframe allocation information and the service scheduled transmission start are semi-statically allocated by the MCE, and for a long time.
  • the base station eNB can provide the information of the subframe in which the predetermined transmission starts and the transmission subframe allocation information to the user equipment UE in advance, and the user equipment UE pre-stores the information, and does not need to resend the base station eNB every time. That is, the above steps SO and S1 can be omitted.
  • the present invention has been described above in terms of a system method, and the present invention will be described below from the perspective of a device.
  • the base station eNB comprises means 1 for providing broadcast and/or multicast services to user equipment, comprising determining means 11, first providing means 12 and transmitting means 13, and preferably comprising second providing means 10, distribution device and scheduling device.
  • the user equipment UE comprises means 2 for receiving broadcast and/or multicast services from the base station, comprising a first acquisition means 21 and a receiving means 22, and preferably a second acquisition means 20.
  • the scheduling device (not shown) of the base station eNB determines the actual transmission of the service in the scheduling period according to the real-time fluctuation of the data volume of the eMBMS service data, as shown in FIG. 1: The statistical multiplexing of the three services is in the scheduling period.
  • the processing device (not shown) of the base station eNB performs the actual transmission in the scheduling period according to the subframe in which the predetermined transmission in the scheduling period of the service data ends, that is, the subframe 2 in the third frame, and the service data.
  • the end subframe that is, the subframe 1 of the third frame, allocates the subframe that is not used for actual transmission, that is, the subframe 2 of the third frame, to other services, such as unicast.
  • the scheduling apparatus uses a unified content synchronization mechanism between the single frequency networks to determine the actual transmission of the service.
  • the determining device 11 determines the dynamic scheduling control information for the service based on the statistical multiplexing, i.e., the actual transmission of the service during the scheduling period.
  • the dynamic scheduling control information is a subframe in which the actual transmission of the service ends in the scheduling period, that is, information related to the first subframe of the third frame.
  • the first The second providing device 10 transmits, by using Radio Resource Control (RRC) signaling, information of the subframe in which the service starts in at least one scheduling period including the scheduling period, and includes the scheduling The broadcast and/or multicast single frequency network transmission subframe allocation information (MBSFN Subframe Allocation) in at least one scheduling period including the period is provided to the user equipment UE.
  • RRC Radio Resource Control
  • MMSFN Subframe Allocation broadcast and/or multicast single frequency network transmission subframe allocation information
  • the second obtaining means 20 of the user equipment UE receives the information of the subframe in which the predetermined transmission starts and the transmission subframe allocation information.
  • the information of the subframe in which the predetermined transmission starts in the at least one scheduling period including the scheduling period is the foregoing MSAP scheduled by the MCE, and the MSAP indicates the predetermined MBMS service transmission starting subframe, and The number of occupied subframes; broadcast and/or multicast single frequency network transmission subframe allocation information is determined by the MCE, indicating which subframes in each frame are used for MBMS services.
  • the processing device included in the receiving device 22 of the user equipment UE can learn which subframes are used for transmitting the MBMS service; and then the processing device can determine according to the information of the transmission start subframe and the information of the transmission end subframe.
  • the processing device learns all MBMS between the transmission start subframe and the transmission end subframe and the two Subframes are all subframes used to transport the service.
  • the base station eNB transmits the information of the actual transmission end subframe and the predetermined transmission start subframe of each service to the user equipment UE, and the second providing apparatus 10 also The transmission order of each service is sent to the user equipment UE, so that the user equipment UE can determine the actual transmission end subframe and the predetermined transmission start subframe corresponding to each service.
  • the information of the subframe in which the actual transmission ends includes the sequence number of the subframe in which the actually transmitted subframe is in the multicast subframe within the scheduling period. Since there are only 6 subframes in each frame, that is, all subframes except 0, 4, 5, and 9 are multicast subframes, there are 192 multicast subframes in 320 ms.
  • the sequence number of the subframe in which the actual transmission ends in the multicast subframe may be 8 bits, so that the dynamic scheduling control information of each service occupies a small amount of data.
  • the first providing device 12 is in the MAC-PDU, that is, the number of packets of the medium access control. According to the unit, the dynamic scheduling control information is provided to the user equipment UE, and no additional out-of-band signaling is needed.
  • This embodiment reuses the MAC-PDU format defined in clause 6.2.1 of TS36.321, and adds a new MAC control element to carry dynamic scheduling control information, which is called "MBMS dynamic scheduling control information MAC control element".
  • MBMS dynamic scheduling control information MAC control element For the definition of the LCID (logical channel identifier) related to the MBMS, reference may be made to the description in the foregoing method embodiments, and details are not described herein.
  • the "MBMS dynamic scheduling control information MAC control element" is composed of one or more decimal strings, wherein each decimal string represents information of a transmission end subframe of an MBMS service in the scheduling period, each decimal string and each MBMS Industry Figure 3 shows the frame format of the MBMS Dynamic Scheduling Control MAC Control Element, in which the End Subframe Number (EPI) is used to represent the information of the end subframe of each service.
  • EPI End Subframe Number
  • the EPI maximum is 196, and the length of one byte can be characterized.
  • the first providing device 12 sends the dynamic scheduling control information to the user equipment UE in the form of a MAC control element in the MAC-PDU of the first subframe in the scheduling period.
  • the frame structure of the MAC-PDU is as shown in FIG. 4, and the MAC header includes subheaders corresponding to each MAC-SDU (Service Data Unit) in the MAC payload respectively; in the MAC payload, the MBMS dynamic scheduling control is first performed.
  • the information MAC control element, followed by the MAC-SDIL of each different logical channel, in addition to being transmitted in the first subframe of the scheduling period, in order to ensure correct reception of the user equipment UE, the first providing device 12 may also The MBMS dynamic scheduling control information MAC control element is repeatedly transmitted.
  • the first acquiring device 21 of the user equipment UE receives, in the MAC-PDU, dynamic scheduling control information of the broadcast service from the base station eNB for the scheduling period, where the dynamic scheduling control information indicates the actual data of the service within the scheduling period. transmission.
  • the dynamic scheduling control information is a sequence number of the actual transmission end subframe of the service in the scheduling period in the multicast subframe in the scheduling period.
  • the second acquisition means 20 of the user equipment UE receives the start of the scheduled transmission. Frame information and transmission subframe allocation information.
  • the processing device of the receiving device 22 of the user equipment UE determines the transmission start subframe and the transmission end subframe of the MBMS service in the scheduling period based on the transmission subframe allocation information and information. Please refer to the description of the base station section for the method of determination.
  • the transmitting device 13 of the base station eNB transmits the data of the MBMS service to the user equipment UE in the corresponding subframe in the scheduling period.
  • the receiver of the receiving device 22 of the user equipment UE receives the data of the MBMS service from the base station eNB from the transmission start subframe to the transmission end subframe.
  • the devices of the base station eNB and the user equipment UE For each scheduling period, the devices of the base station eNB and the user equipment UE repeatedly operate. It is worth noting that in the actual network, since the subframe in which the transmission subframe allocation information and the service scheduled transmission start are semi-statically allocated by the MCE, and remains unchanged for a long period of time, the second base station eNB
  • the providing device 10 can provide the information of the subframe in which the predetermined transmission starts, and the transmission subframe allocation information to the user equipment UE in advance.
  • the user equipment UE pre-stores the information, and does not need to be re-transmitted every time the base station eNB, that is, the above second providing device 10 and the second obtaining device 20 can be omitted.
  • the embodiments of the present invention have been described above, and it is to be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications and changes within the scope of the appended claims.

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Abstract

本发明公开了一种无线网络中的广播和/或组播的通信方法及其装置。基站根据广播和/或组播业务在一个调度周期内的实际传输,确定各业务的动态调度控制信息,并在媒体接入控制的分组数据单元中,将动态调度控制信息提供给用户设备;用户设备在媒体接入控制的分组数据单元中,接收该动态调度控制信息,并根据该动态调度控制信息,在该调度周期中接收来自基站的广播和/或组播业务的数据。

Description

无线网络中的广播和 /或组播的
通信方法及其装置 技术领域
本发明涉及无线通信网络,尤其涉及无线网络中进行广播和 /或组 播的通信方法及装置 背景技术
如今, 增强型多媒体广播组播服务 ( Enhanced Multimedia Broadcast Multicast Service, 简称 eMBMS )等广播和 /或组播业务在无 线通信网络中的应用越来越广泛。 LTE第 9版中 RP-090350的标准要 求的多媒体组播 /广播单频网 (Multimedia Broadcast Multicast service Single Frequency Network, 简称 MBSFN ) 能够对 MBMS业务提供较好 的支持, 同一 MBSFN区域内的各小区基站都使用相同的时频资源同时 发送 MBMS业务, 使得各个小区的 MBMS业务的信号能够在空中自 然相互叠加, 向用户设备提供无线射频 (RF )合并增益, 便与其接收 与提取 MBMS业务数据。
具有相同 QoS 的不同 MBMS 业务可以进行统计复用 (Statistical Multiplexing, 简称 SM ), 在同一个 MCH (多播信道) 中进行传输。 这 些可以进行统计复用的业务被定义为一个 "业务包" ( Service Bundle )。 单个的、 未经统计复用的业务可以看作是一个仅包含一个业务的业务 包。 在调度过程中, 一个业务包可以视作一个业务。
目前, 网络中的多播协调实体( Multicast Coordination Entity, 简称 MCE )根据每个业务的 QoS, 为其确定一个半静态的多播信道子帧分配 方案 ( MCH Subframe Allocation Pattern, 简称 MSAP ), 该 MSAP在每 一个周期中决定了每个业务的最大占用资源量。 另一方面, MCE也根据 每个业务的 QoS决定其传输优先级和编码与调制方式 (MCS )。
而在实际系统中, 业务实际占用的子帧数量可能小于由 MCE分配 并在 MSAP中预定的子帧数量。 因此, 为了更好地利用未被实际占用的 子帧, 提高资源利用率, 与前述 MCE进行半静态子帧分配相对地, 无 线系统还才艮据 eMBMS业务数据的数据量的实时波动, 以例如 320ms为 一个调度周期, 对每个周期内的数据传输所占用的资源量, 即子帧个数 进行动态地、 MAC 层的调度, 调度的粒度是以子帧为单位。 这一实时 处理可以由 MAC动态调度在每个调度周期中完成。为了支持统计复用, 提高无线资源利用率,统计复用中的各业务连续地传输。填充(Padding ) 仅被附加于调度周期中每个 MCH的最后一个子帧中。经调度后发现的、 不被 MBMS业务实际传输占用的剩余子帧可以用于单播等其它业务。
图 1示出了基于 MSAP进行 MBMS动态调度的一个例子。 其中, 由于每个帧的第 0、 4、 5和 9号子帧需用于传输寻呼消息、 系统信息等 控制信息, 因此标准规定第 0、 4、 5和 9号子帧不能定义为 MBSFN (组 播广播单频网)传输子帧, 所以在本例中, 无线系统将 MBSFN传输子 帧分配确定为每个帧第 1、 2和 3号子帧; 并且, 无线系统确定每个调 度周期的前十个帧可用于承载 MBSFN传输子帧。 在这种场景下, MCE 进行半静态分配可用的子帧总数在这个 320ms调度周期中为 30个。 在 本示例中, MSAP所占用的子帧从第一个帧开始, 依次占用连续的数个 帧中的 MBSFN子帧。
一个统计复用中包括三个业务 SI , S2与 S3, 它们组成了一个业务 包{ SI , S2, S3}。 才艮据三个业务的 QoS和业务量, MCE计算出分配 8 个子帧用于传输这三个业务, 如图 1所示, 即第一无线帧和第二无线帧 的第 1、 2和 3号子帧, 第三个无线帧的第 1和第 2号子帧。 MCE将该 分配结果在 MSAP中预定下来提供给各基站及移动终端。 但是, 由于各 业务的实际数据速率发生波动, 实际上需要传输的三个业务的数据仅占 用 6.5个子帧(其中 S1如左下斜划线块所示, 占用 2.5个子帧; S2如方 格块所示, 占用 3个子帧; S3如右下斜划线块所示, 占用 1个子帧), 如图 1所示。 因此, 基站对这三个业务进行动态调度后, 可以留下一个 未被实际占用子帧, 如图 1中的横线块所示。 基站可将该子帧分配给单 播等业务使用。 填充(Padding )仅被附加于调度周期中每个 MCH的最 后一个子帧中, 如图 1中的竖线块所示。 显然, 由于 MBMS动态调度以较长时间为周期, 所以 eMBMS的调 度不同于单播调度: MBMS 动态调度对实时性的要求相对单播调度较 低。 因而, 对于物理多播信道(PMCH ) 来说, 并没有如物理下行共享 信道(PDSCH ) 所对应的物理下行控制信道(PDCCH ) 这样的专用的 下行控制信道, 所以如何将每个调度周期的 MBMS 动态调度控制信息 发送给用户设备, 即如何向用户设备指示每个调度周期中各个业务的实 际传输, 成为了一个需要解决的技术问题。 发明内容
在 LTE第 8版中, MAC (媒质接入控制)层没有对 eMBMS业务 进行特别设计。 而在第 9版要求能够正确和高效地支持 eMBMS, 特 别要求支持 TS36.300中达成协议的服务复用,因而 MAC层可以对此 进行某些优化, 以将每个调度周期的 MBMS动态调度控制信息提供 给用户设备。
为了较好地满足该技术需求, 根据本发明的一个方面, 提供了一 种在无线通信网络的基站中用于向用户设备提供广播和 /或组播业务 的方法, 其中, 包括如下步骤: i.根据广播和 /或组播业务在一个调度 周期内的实际传输, 确定各业务的动态调度控制信息; 11.在媒质接入 控制的分组数据单元中, 将所述动态调度控制信息提供给所述用户设 备; iii.将所述广播和 /或组播业务的数据在所述调度周期中发送给所 述用户设备。
根据本发明的另一个方面, 提供了一种在无线通信网络的用户设 备中用于接收来自基站的广播和 /或组播业务的方法,其中, 包括如下 步骤: I.在媒质接入控制的分组数据单元中, 接收来自所述基站的、 广播和 /或组播业务的、对于一个调度周期的动态调度控制信息, 所述 动态调度控制信息指示业务的数据在所述调度周期内的实际传输; II. 根据所述动态调度控制信息, 在所述调度周期中接收来自所述基站的 广播和 /或组播业务的数据。
根据本发明的第三个方面, 提供了一种在无线通信网络的基站中 用于向用户设备提供广播和 /或组播业务的装置, 其中, 包括: 确定装 置, 用于根据广播和 /或组播业务在一个调度周期内的实际传输,确定 各业务的动态调度控制信息; 第一提供装置, 用于在媒质接入控制的 分组数据单元中, 将所述动态调度控制信息提供给所述用户设备; 发 送装置,用于将所述广播和 /或组播业务的数据在所述调度周期中发送 给所述用户设备。
根据本发明的第四个方面, 提供了一种在无线通信网络的用户设 备中用于接收来自基站的广播和 /或组播业务的装置, 其中, 包括: 第 一获取装置, 用于在媒质接入控制的分组数据单元中, 接收来自所述 基站的、广播和 /或组播业务的、对于一个调度周期的动态调度控制信 息, 所述动态调度控制信息指示业务的数据在所述调度周期内的实际 传输; 接收装置, 用于根据所述动态调度控制信息, 在所述调度周期 中接收来自所述基站的广播和 /或组播业务的数据。 优选地, 该动态调度控制信息包括业务在该调度周期内实际传输 结束的子帧在该调度周期内的多播子帧中的序号,基站以媒质接入控 制的控制元的形式在每个调度周期的第一个子帧中发送给用户设备, 并优选地在调度期间重发。基站还将指示着业务在至少一个调度周期 内预定传输开始的子帧的多播信道分配方案, 以及在至少一个调度周 期内预定的广播和 /或组播单频网传输子帧分配信息发送给用户设备, 使用户设备能够确定该业务在调度周期内的传输开始子帧和传输结 束子帧, 并在相应子帧内接收基站发送的业务数据。
根据本发明, 在 MAC层中进行各调度周期的动态调度控制信息 的通信, 基站 eNB 能够在不需要额外的带外信令指示的情况下, 将 动态调度的结果通知用户设备 UE, 用户设备 UE能够正确的获得该 调度结果,并根据该调度结果正确地接收所需要的业务数据。优选地, 动态调度控制信息包括业务在该调度周期内实际传输结束的子帧在 该调度周期内的多播子帧中的序号, 使得控制信息的长度较小。 附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描 述, 本发明的其它特征、 目的和优点将会变得更加明显:
图 1是在一个调度周期中基于 MSAP进行 eMBMS动态调度的示 意图;
图 2是根据本发明的一个实施例,基站和用户设备进行广播和 /或组 播业务通信的方法流程图;
图 3 是根据本发明的一个实施例, 以 MAC控制元的形式交互的 eMBMS动态调度控制信息的结构;
图 4是根据本发明的一个实施例, 包含 MBMS动态调度控制信息 MAC控制元的 MAC-PDU的帧结构;
图 5是根据本发明的另一个实施例, 基站和用户设备进行广播和 / 或组播业务通信的装置的框图。
附图中, 相同或者相似的附图标识代表相同或者相似的部件。 具体实施方式
在本发明的具体实施方式中, 以一个无线 MBSFN网络中的基站 eNB与其所辖的用户设备 UE进行 MBMS通信, 所通信的业务可以 是单个业务, 也可以是前述的包括多个业务的一个统计复用, 还可以 是多个 QoS不同的统计复用。 在这里, 将各种情况都统称为广播和 / 或组播业务通信。
在本实施例中, 调度周期长度仍然为 320ms。 可以理解, 在其它 调度周期长度, 例如 640ms的情况下, 本发明同样适用。
这里仍然以前面描述过的如图 1 所示的在一个调度周期内基于 MSAP进行 eMBMS动态调度为例。 MCE已经才艮据统计复用 {S1,S2,S3} 业务的 QoS, 为其确定一个半静态的多播信道子帧分配方案 (MCH Subframe Allocation Pattern, 简称 MSAP ): 该业务在包括该调度周期在 内的多个调度周期内,分别在每个调度周期中占用 8个子帧传输。 MSAP 指示了预定的 MBMS业务传输开始子帧, 以及占用的子帧个数。 以下首先参照附图 1至图 4, 从系统方法的角度对本发明的具体 实施方式进行详细描述。
基站 eNB根据 eMBMS业务数据的数据量的实时波动,确定业务在 调度周期内的实际传输:三个业务组成的统计复用在调度周期内实际占 用 6.5个子帧, 其中 S1 占用第一帧的第 1、 2和 3号子帧, 如左下斜划 线块所示, 共 2.5个子帧; S2占用第一帧第 3号子帧, 和第二帧的第 1、 2和 3号子帧, 如方格块所示, 共 3个子帧; S3占用第二帧的第 3号子 帧与第三帧的第 1号子帧, 如右下斜划线块所示, 共占用 1个子帧。 基 站 eNB根据业务数据的在调度周期内的预定传输结束的子帧,即第三 帧的第 2号子帧,与业务数据的在调度周期内的实际传输结束的子帧, 即第三帧的第 1 号子帧, 将未用作实际传输的子帧, 即第三帧的第 2 号子帧分配给其他业务, 例如单播使用。 动态调度的相关技术是本领 域的一般技术所熟知的, 本发明再次不做赘述。 在本基站于其他小区 的基站同属于一个组播广播单频率网络区域时, 本基站使用单频网之 间统一的内容同步机制, 确定业务在调度周期内的实际传输。
首先, 在步骤 S2中, 基站 eNB才艮据该统计复用, 即该业务在该 调度周期内的实际传输, 确定该业务的动态调度控制信息。
在一种情况下, 动态调度控制信息是该业务所占用的各子帧在调 度周期内的所有子帧中的序号。 在 320ms的调度周期中, 共有 320个 子帧。 则每个子帧序号的长度应该为 9位, 7个传输子帧共需 63位的 数据量, 所占数据量较大。
在另一种优选地情况下, 动态调度控制信息是该业务在该调度周 期内的实际传输结束的子帧, 即第三帧的第 1号子帧的相关信息。 在 这种情况下, 在步骤 SO 中, 基站 eNB 通过无线资源控制 (Radio Resource Control, 简称 RRC )信令将该业务在包括该调度周期在内的 至少一个调度周期内的、 预定传输开始的子帧的信息, 以及在包括该 调度周期在内的至少一个调度周期内的广播和 /或组播单频网传输子 帧分配信息 ( MBSFN Subframe Allocation )提供给用户设备 UE。 相 应的, 在步骤 SI 中, 用户设备 UE接收到预定传输开始的子帧的信 息和传输子帧分配信息。 其中, 该业务在包括该调度周期在内的至少 一个调度周期内的、 预定传输开始的子帧的信息是前述的、 由 MCE 预定的 MSAP; 广播和 /或组播单频网传输子帧分配信息是由 MCE确 定的, 指示了各个帧中的哪一些子帧是用于 MBMS 业务的。 基于传 输子帧分配消息,用户设备 UE获知哪些子帧是用于传输 MBMS业务; 继而可以根据传输开始子帧的信息和传输结束子帧的信息, 确定这两 个子帧在整个调度周期内的各子帧中的位置; 而后, 在 MBMS传输 是连续的情况下, 用户设备 UE获知在该传输开始子帧和该传输结束 子帧以及两者之间的所有 MBMS子帧都是用于传输该业务的子帧。 在统一调度周期内将要发送多个 MBMS业务的情况下, 基站 eNB将 各个业务分别的实际传输结束子帧, 预定传输开始子帧的信息发送给 用户设备 UE,并且,基站 eNB也将各个业务的传输顺序( Transmission Order )发送给用户设备 UE, 使得用户设备 UE能够确定各个业务所 对应的实际传输结束子帧和预定传输开始子帧。
在一个优选的实施例中, 实际传输结束的子帧的信息包括实际传 输结束的子帧在调度周期内的多播子帧中的序号。 由于每个帧中只有 6个子帧, 即除开 0、 4、 5和 9之外的所有子帧是多播子帧, 在 320ms 内共有 192个多播子帧。 则实际传输结束的子帧在多播子帧中的序号 长度可以为 8位, 这样, 每一个业务的动态调度控制信息所占的数据 量较小。
而后, 在步骤 S3中, 基站 eNB在 MAC-PDU, 即媒质接入控制 的分组数据单元中, 将动态调度控制信息提供给用户设备 UE, 不需 要额外的带外信令。
本实施例重用了 TS36.321第 6.2.1节定义的 MAC-PDU格式, 该 格式用于下行同步信道 (DL-SCH ) 和上行同步信道 (UL-SCH )。 在 该格式中, 本实施例增加了一个新的 MAC控制元以承载动态调度控 制信息, 将其称作 "MBMS动态调度控制信息 MAC控制元"。
下表示出了与 MBMS相关的 LCID (逻辑信道标识), 这些标识 的定义与用于 DL-SCH的 TS36.321表 6.2.1-1类似,与 DL-SCH兼容。
Values of LCID for MBMS related
Figure imgf000010_0001
对于 MBMS , MCCH 的 LCID 可从标准中的保留字中选用 "01011"。 " MBMS动态调度控制信息 MAC控制元 "的 LCID也可以 使用标准中的保留字 " 11011"。 与下行同步信道相关的所有 LCID应 该保持, 不能由 MBMS使用。 但是 MBSM业务的 MCH可以共享 DL-SCH的逻辑信道的标识 00001-01010。
具体的 "MBMS动态调度控制信息 MAC控制元"可以如下定义: 由一个或多个十进制字符串组成, 其中每一个十进制字符串表示一个 MBMS业务的在本调度周期中的传输结束子帧的信息,各十进制字符 串和各 MBMS业务——对应,其顺序也就是 MCE所确定的各 MBMS 业务的传输顺序。 可见, 该控制元的长度不定。 图 3 示出了 MBMS 动态调度控制 MAC控制元的帧格式, 其中使用结束子帧序号 (EPI ) 表示各个业务的结束子帧的信息。 在传输子帧的信息为该子帧在调度 周期内的多播子帧中的序号的优选实施例情况下, EPI最大值为 196, 一个字节长度的二进制序列能够表征。
优选地, 基站 eNB在调度周期中的第一个子帧的 MAC-PDU中, 以 MAC控制元的形式接入将动态调度控制信息发送给用户设备 UE。 该 MAC-PDU 的帧结构如图 4 所示, MAC 头部中包括分别对应与 MAC载荷中的各个 MAC-SDU (服务数据单元) 的子头部; 在 MAC 载荷中, 首先是 MBMS动态调度控制信息 MAC控制元, 随后是各个 不同逻辑信道的 MAC-SDIL 除了在调度周期的第一个子帧中发送以 外, 为了保证用户设备 UE的正确接收, 基站 eNB在该调度周期中还 可以在业务实际传输之前, 至少一次重发 MBMS动态调度控制信息 MAC控制元。
接着, 在步骤 S4中, 用户设备 UE在 MAC-PDU中, 接收来自 基站 eNB 的该广播业务对于本调度周期的动态调度控制信息, 该动 态调度控制信息指示业务的数据在调度周期内的实际传输。 在基站 eNB 在调度周期中在业务实际传输之前重复发送动态调度控制信息 的情况下, 用户设备也重复接收该信息。
优选地, 该动态调度控制信息为该业务在本调度周期内的实际传 输结束子帧在调度周期内的多播子帧中的序号。
此前,在步骤 S1中, 用户设备 UE接收到预定传输开始的子帧的 信息和传输子帧分配信息。 则基于前述的方式, 用户设备 UE可以确 定该 MBMS业务在调度周期中的传输子帧的个数以及位置。
在步骤 S60中, 用户设备 UE根据传输子帧分配信息, 基于接收
MBMS业务在调度周期内的传输开始子帧和传输结束子帧。确定的方 式请参照基站部分的描述。
而后, 在步骤 S5中,基站 eNB将 MBMS业务的数据在调度周期 中的相应子帧里发送给用户设备 UE。
在步骤 S61中, 用户设备 UE从所确定的传输开始子帧起, 至所 确定的传输结束子帧止, 接收来自基站 eNB的 MBMS业务的数据。
对于每一个调度周期, 基站 eNB和用户设备 UE重复以上步骤。 值得注意的是, 在实际网络中, 由于传输子帧分配信息和业务预定传 输开始的子帧是由 MCE半静态地分配的, 并且在持续相当长时间内 维持不变, 所以基站 eNB可以提前将该预定传输开始的子帧的信息, 以及传输子帧分配信息提供给用户设备 UE, 用户设备 UE将这些信 息预存起来, 不需要基站 eNB每一次都重新发送, 即以上步骤 SO和 S1是可以省略的。 以上从系统方法的角度对本发明进行了描述, 以下将从装置的角 度对本发明进行描述。
如图 5所示, 基站 eNB包括用于向用户设备提供广播和 /或组播 业务的装置 1 , 其中包括确定装置 11 , 第一提供装置 12和发送装置 13, 并优选地包括第二提供装置 10, 分配装置和调度装置。 用户设备 UE包括用于接收来自基站的广播和 /或组播业务的装置 2, 其中包括 第一获取装置 21和接收装置 22, 并优选地包括第二获取装置 20。
基站 eNB的调度装置(图中未示出)根据 eMBMS业务数据的数据 量的实时波动, 确定业务在调度周期内的实际传输, 如图 1所示: 三 个业务组成的统计复用在调度周期内实际占用 6.5个子帧,其中 S1 占用 第一帧的第 1、 2和 3号子帧, 如左下斜划线块所示, 共 2.5个子帧; S2 占用第一帧第 3号子帧, 和第二帧的第 1、 2和 3号子帧, 如方格块所 示, 共 3个子帧; S3占用第二帧的第 3号子帧与第三帧的第 1号子帧, 如右下斜划线块所示, 共占用 1个子帧。 基站 eNB的处理装置 (图中 未示出)根据业务数据的在调度周期内的预定传输结束的子帧, 即第 三帧的第 2号子帧, 与业务数据的在调度周期内的实际传输结束的子 帧, 即第三帧的第 1 号子帧, 将未用作实际传输的子帧, 即第三帧的 第 2号子帧分配给其他业务, 例如单播使用。 在本基站于其他小区的 基站同属于一个组播广播单频率网络区域时, 调度装置使用单频网之 间统一的内容同步机制, 确定业务的实际传输。
确定装置 11 而后根据该统计复用, 即该业务, 在该调度周期内 的实际传输, 确定该业务的动态调度控制信息。
优选地, 动态调度控制信息是该业务在该调度周期内的实际传输 结束的子帧, 即第三帧的第 1号子帧的相关信息。 在这种情况下, 第 二提供装置 10通过无线资源控制(Radio Resource Control,简称 RRC ) 信令将该业务在包括该调度周期在内的至少一个调度周期内的、预定 传输开始的子帧的信息, 以及在包括该调度周期在内的至少一个调度 周期内的广播和 /或组播单频网传输子帧分配信息 ( MBSFN Subframe Allocation )提供给用户设备 UE。 相应的, 用户设备 UE的第二获取 装置 20接收到预定传输开始的子帧的信息和传输子帧分配信息。 其 中, 该业务在包括该调度周期在内的至少一个调度周期内的、 预定传 输开始的子帧的信息是前述的、 由 MCE预定的 MSAP, MSAP指示 了预定的 MBMS业务传输开始子帧, 以及占用的子帧个数; 广播和 / 或组播单频网传输子帧分配信息是由 MCE确定的, 指示了各个帧中 的哪一些子帧是用于 MBMS业务的。 基于传输子帧分配消息, 用户 设备 UE的接收装置 22 包含的处理装置可以获知哪些子帧是用于传 输 MBMS 业务; 继而处理装置可以根据传输开始子帧的信息和传输 结束子帧的信息, 确定这两个子帧在整个调度周期内的子帧中的位 置; 而后, 在 MBMS传输是连续的情况下, 处理装置获知在该传输 开始子帧和该传输结束子帧以及两者之间的所有 MBMS子帧都是用 于传输该业务的子帧。 在统一调度周期内将要发送多个 MBMS 业务 的情况下, 基站 eNB 将各个业务分别的实际传输结束子帧, 预定传 输开始子帧的信息发送给用户设备 UE, 并且, 第二提供装置 10也将 各个业务的传输顺序 (Transmission Order )发送给用户设备 UE, 使 得用户设备 UE能够确定各个业务所对应的实际传输结束子帧和预定 传输开始子帧。
在一个优选的实施例中, 实际传输结束的子帧的信息包括实际传 输结束的子帧在调度周期内的多播子帧中的序号。 由于每个帧中只有 6个子帧, 即除开 0、 4、 5和 9之外的所有子帧是多播子帧, 在 320ms 内共有 192个多播子帧。 则实际传输结束的子帧在多播子帧中的序号 长度可以为 8位, 这样, 每一个业务的动态调度控制信息所占的数据 量较小。
而后, 第一提供装置 12在 MAC-PDU, 即媒质接入控制的分组数 据单元中, 将动态调度控制信息提供给用户设备 UE, 不需要额外的 带外信令。
本实施例重用了 TS36.321第 6.2.1节定义的 MAC-PDU格式, 增 加了一个新的 MAC 控制元以承载动态调度控制信息, 将其称作 "MBMS动态调度控制信息 MAC控制元"。 与 MBMS相关的 LCID (逻辑信道标识)的定义可以参考前述方法实施例中的说明, 在此不 再赘述。
"MBMS动态调度控制信息 MAC控制元" 由一个或多个十进制 字符串组成, 其中每一个十进制字符串表示一个 MBMS 业务的在本 调度周期中的传输结束子帧的信息, 各十进制字符串和各 MBMS 业 图 3示出了 MBMS动态调度控制 MAC控制元的帧格式,其中使用结 束子帧序号 (EPI ) 表示各个业务的结束子帧的信息。 在传输子帧的 信息为该子帧在调度周期内的多播子帧中的序号的优选实施例情况 下, EPI最大值为 196, 一个字节的长度能够表征。
第一提供装置 12在调度周期中的第一个子帧的 MAC-PDU中, 以 MAC控制元的形式接入将动态调度控制信息发送给用户设备 UE。 该 MAC-PDU 的帧结构如图 4 所示, MAC 头部中包括分别对应与 MAC载荷中的各个 MAC-SDU (服务数据单元) 的子头部; 在 MAC 载荷中, 首先是 MBMS动态调度控制信息 MAC控制元, 随后是各个 不同逻辑信道的 MAC-SDIL 除了在调度周期的第一个子帧中发送以 外, 为了保证用户设备 UE的正确接收, 第一提供装置 12在该调度 周期中还可以重复发送 MBMS动态调度控制信息 MAC控制元。
接着, 用户设备 UE的第一获取装置 21在 MAC-PDU中, 接收 来自基站 eNB 的该广播业务对于本调度周期的动态调度控制信息, 该动态调度控制信息指示业务的数据在调度周期内的实际传输。
优选地, 该动态调度控制信息为该业务在本调度周期内的实际传 输结束子帧在调度周期内的多播子帧中的序号。
此前,用户设备 UE的第二获取装置 20接收到预定传输开始的子 帧的信息和传输子帧分配信息。
用户设备 UE的接收装置 22的处理装置根据传输子帧分配信息, 信息, 确定 MBMS 业务在调度周期内的传输开始子帧和传输结束子 帧。 确定的方式请参照基站部分的描述。
而后,基站 eNB的发送装置 13将 MBMS业务的数据在调度周期 中的相应子帧里发送给用户设备 UE。
而后,用户设备 UE的接收装置 22的接收机从传输开始子帧至传 输结束子帧, 接收来自基站 eNB的 MBMS业务的数据。
对于每一个调度周期,基站 eNB和用户设备 UE的各装置重复运 作。 值得注意的是, 在实际网络中, 由于传输子帧分配信息和业务预 定传输开始的子帧是由 MCE半静态地分配的, 并且在持续相当长时 间内维持不变, 所以基站 eNB的第二提供装置 10可以提前将该预定 传输开始的子帧的信息 , 以及传输子帧分配信息提供给用户设备 UE。 用户设备 UE将这些信息预存起来,不需要基站 eNB每一次都重新发 送, 即以上第二提供装置 10和第二获取装置 20是可以省略的。 以上对本发明的具体实施例进行了描述, 需要理解的是, 本发明 并不局限于上述特定的实施方式, 本领域技术人员可以在所附权利要 求的范围内做出各种变型和修改。

Claims

权 利 要 求 书
1. 一种在无线通信网络的基站中用于向用户设备提供广播和 /或 组播业务的方法, 其中, 包括如下步驟:
1. 根据广播和 /或组播业务在一个调度周期内的实际传输, 确定 各业务的动态调度控制信息;
ii. 在媒质接入控制的分组数据单元中,将所述动态调度控制信息 提供给所述用户设备;
iii. 将所述广播和 /或组播业务的数据在所述调度周期中发送给 所述用户设备。
2. 根据权利要求 1所述的方法, 其特征在于, 所述动态调度控制 信息包括该业务的数据在所述调度周期内的实际传输结束的子帧的
Ί§·息
所述方法还包括如下步骤:
a. 将所述各广播和 /或组播业务的、 在至少一个调度周期内的、 预定传输开始的子帧的信息, 以及至少一个调度周期内预定的、 广播 和 /或组播单频网传输子帧分配信息提供给所述用户设备提供给用户 设备。
3. 根据权利要求 2所述的方法, 其特征在于, 所述实际传输结束 的子帧的信息包括实际传输结束的子帧在所述调度周期内的多播子 帧中的序号, 所述预定传输开始的子帧的信息包括多播信道分配方 案。
4. 根据权利要求 1所述的方法, 其特征在于, 该方法还包括如下 步骤:
- 根据所述业务数据的、 在所述调度周期内的预定传输结束的子 帧, 与所述业务数据的、 在所述调度周期内的实际传输结束的子帧,
5. 根据权利要求 1所述的方法, 其特征在于, 所述无线通信网絡 是基于长期演进协议的组播广播单频网传输模式, 所述方法还包括以 下步骤:
- 基于同属于一个组播广播单频率网络区域的各单频率网络之间 统一的内容同步规则, 确定所述各业务在调度周期内的实际传输。
6. 根据权利要求 1至 5中任一项所述的方法, 其特征在于, 所述 步骤 ii包括:
- 在所述调度周期中的第一个子帧中, 以媒质接入控制的控制元 的形式接入将所述动态调度控制信息发送给所述用户设备, 并在所述 调度周期中重发;
对于每个调度周期, 重复所述步骤 i至 iii。
7. 一种在无线通信网络的用户设备中用于接收来自基站的广播 和 /或组播业务的方法, 其中, 包括如下步骤:
I. 在媒质接入控制的分组数据单元中, 接收来自所述基站的、 广 播和 /或组播业务的、对于一调度周期的动态调度控制信息, 所述动态 调度控制信息指示业务的数据在所述调度周期内的实际传输;
II. 根据所述动态调度控制信息, 在所述调度周期中接收来自所 述基站的广播和 /或组播业务的数据。
8. 根据权利要求 7所述的方法, 其特征在于, 所述动态调度控制 信息包括该业务数据在所述调度周期内的实际传输结束的子帧的信 息, 所述方法还包括如下步骤:
- 接收来自所述基站的、 广播和 /或组播业务的、 在至少一个调度 周期内的预定传输开始的子帧的信息, 以及至少一个调度周期内的预 定的广播和 /或组播单频网传输子帧分配信息。
所述步骤 II包括:
III . 确定所述广播和 /或组播业务在所述调度周期内的传输开始 子帧和传输结束子帧;
112. 从所述传输开始子帧至所述传输结束子帧, 接收来自所述基 站的广播和 /或组播业务的数据。
9. 根据权利要求 8所述的方法, 其特征在于, 所述实际传输结束 的子帧的信息包括该子帧在所述调度周期内的多播子帧中的序号, 所 述预定传输开始的子帧的信息包括多播信道子帧分配方案, 所述步驟
III包括:
- 基于所述广播和 /或组播子帧分配信息,根据所述多播信道分配 方案, 和所述传输结束的子帧在所述调度周期内的多播子帧中的序 号,确定所述广播和 /或组播业务在所述调度周期内的传输开始子帧和 传输结束子帧。
10. 根据权利要求 7所述的方法, 其特征在于, 所述无线通信网 络是基于长期演进协议的组播广播单频网传输模式。
11. 根据权利要求 7所述的方法, 其特征在于, 所述步骤 I包括: - 在所述调度周期中的第一个子帧中, 接收媒质接入控制的控制 元的形式的所述动态调度控制信息, 并在所述调度周期中重复接收; 对于每个调度周期, 重复所述步驟 I至 II。
12. 一种在无线通信网络的基站中用于向用户设备提供广播和 / 或组播业务的装置, 其中, 包括:
-确定装置, 用于根据广播和 /或组播业务在一个调度周期内的实 际传输, 确定各业务的动态调度控制信息;
- 第一提供装置, 用于在媒质接入控制的分组数据单元中, 将所 述动态调度控制信息提供给所述用户设备;
- 发送装置,用于将所述广播和 /或组播业务的数据在所述调度周 期中发送给所述用户设备。
13. 根据权利要求 12所述的装置, 其特征在于, 所述动态调度控 制信息包括该业务的数据在所述调度周期内的实际传输结束的子帧 的信息;
该装置还包括:
- 第二提供装置, 用于将所述各广播和 /或组播业务的、 在至少一 个调度周期内的、 预定传输开始的子帧的信息, 以及至少一个调度周 期内预定的、广播和 /或组播单频网传输子帧分配信息提供给所述用户 设备提供给用户设备。
14. 根据权利要求 13所述的装置, 其特征在于, 所述实际传输结 子帧中的序号, 所述预定传输开始的子帧的信息包括多播信道分配方 案。
15. 根据权利要求 12所述的装置, 其特征在于, 该装置还包括: - 分配装置, 用于根据所述业务数据的、 在所述调度周期内的预 定传输结束的子帧, 与所述业务数据的、 在所述调度周期内的实际传 输结束的子帧, 将未用作实际传输的子帧分配给其他业务使用。
16. 根据权利要求 12所述的装置, 其特征在于, 所述无线通信网 络是基于长期演进协议的组播广播单频网传输模式, 该装置还包括:
- 调度装置, 用于基于同属于一个组播广播单频率网络区域的各 单频率网络之间统一的内容同步规则, 确定所述各业务在调度周期内 的实际传输。
17. 根据权利要求 12至 16中任一项所述的装置, 其特征在于, 所述第一提供装置用于:
在所述调度周期中的第一个子帧中, 以媒质接入控制的控制元的 形式接入将所述动态调度控制信息发送给所述用户设备, 并在所述调 度周期中重发;
对于每个调度周期, 各装置重复运作。
18. 一种在无线通信网络的用户设备中用于接收来自基站的广播 和 /或组播业务的装置, 其中, 包括:
- 第一获取装置, 用于在媒质接入控制的分组数据单元中, 接收 来自所述基站的、广播和 /或组播业务的、对于一个调度周期的动态调 度控制信息, 所述动态调度控制信息指示业务的数据在所述调度周期 内的实际传输;
- 接收装置, 用于根据所述动态调度控制信息, 在所述调度周期 中接收来自所述基站的广播和 /或组播业务的数据。
19. 根据权利要求 18所述的装置, 其特征在于, 所述动态调度控 制信息包括该业务数据在所述调度周期内的实际传输结束的子帧的 信息, 该装置还包括: - 第二接收装置, 用于接收来自所述基站的、 广播和 /或组播业务 的、 在至少一个调度周期内的预定传输开始的子帧的信息, 以及在至 少一个调度周期内的预定的广播和 /或组播单频网传输子帧分配信息。
所述接收装置包括:
- 处理装置,用于确定所述广播和 /或组播业务在所述调度周期内 的传输开始子帧和传输结束子帧;
- 接收机, 用于从所述传输开始子帧至所述传输结束子帧, 接收 来自所述基站的广播和 /或组播业务的数据。
20. 根据权利要求 19所述的装置, 其特征在于, 所述实际传输结 束的子帧的信息包括该子帧在所述调度周期内的多播子帧中的序号, 所述预定传输开始的子帧的信息包括多播信道子帧分配方案, 所述处 理装置还用于:
基于所述广播和 /或组播子帧分配信息,根据所述多播信道分配方 案, 和所述传输结束的子帧在所述调度周期内的多播子帧中的序号, 确定所述广播和 /或组播业务在所述调度周期内的传输开始子帧和传 输结束子帧。
21 根据权利要求 18所述的装置, 其特征在于, 所述无线通信网 络是基于长期演进协议的组播广播单频网传输模式。
22. 根据权利要求 18所述的装置, 其特征在于, 所述第一获取装 置用于:
在所述调度周期中的第一个子帧中, 接收媒质接入控制的控制元 的形式的所述动态调度控制信息, 并在所述调度周期中重复接收; 对于每个调度周期, 各装置重复运作。
23. 一种无线通信网絡的基站, 其特征在于, 包括根据权利要求 12至 17中任一项所述的用于向用户设备提供广播和 /或组播业务的装 置。
24. —种无线通信网络的用户终端, 其特征在于, 包括根据权利 要求 18至 22中任一项所述的用于接收来自基站的广播和 /或组播业务 的装置。
PCT/CN2009/000459 2009-04-28 2009-04-28 无线网络中的广播和/或组播的通信方法及其装置 WO2010124415A1 (zh)

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JP2012507560A JP5442106B2 (ja) 2009-04-28 2009-04-28 無線ネットワーク内でのブロードキャストおよび/またはマルチキャストの通信方法およびデバイス
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