WO2009062436A1 - Procédé de réglage de synchronisation pour service multidiffusion de radiodiffusion multimédia et station de base améliorée - Google Patents

Procédé de réglage de synchronisation pour service multidiffusion de radiodiffusion multimédia et station de base améliorée Download PDF

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Publication number
WO2009062436A1
WO2009062436A1 PCT/CN2008/072716 CN2008072716W WO2009062436A1 WO 2009062436 A1 WO2009062436 A1 WO 2009062436A1 CN 2008072716 W CN2008072716 W CN 2008072716W WO 2009062436 A1 WO2009062436 A1 WO 2009062436A1
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Prior art keywords
mbms
data packet
initial
enb
tti
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PCT/CN2008/072716
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English (en)
Chinese (zh)
Inventor
Qufang Huang
Junwei Wang
Xiao Zhou
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Huawei Technologies Co., Ltd.
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Publication of WO2009062436A1 publication Critical patent/WO2009062436A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention relates to the field of Multimedia Broadcast Multicast Service (MBMS), and particularly relates to a method for MBMS synchronization adjustment and an enhanced base station (eNB).
  • MBMS Multimedia Broadcast Multicast Service
  • eNB enhanced base station
  • MBMS is one of the important contents of the business development of the 3rd Generation Partnership Project (3GPP). It mainly means that the network side simultaneously transmits the same multimedia data to multiple receivers in the network. Compared to single-user transmission, MBMS greatly saves air interface resources.
  • RAN 3 Radio Access Network 3, the structure of the radio access network
  • LTE Long Term Evolution
  • Figure 1 shows MBMS in LTE. Schematic diagram of the architecture.
  • the MBMS gateway (GW, Gateway) is connected to the eNB through the M1 interface, which is a pure user plane interface.
  • the MBMS GW is connected to the Multi-cell/Multicast Coordination Entity (MCE) through an M3 interface, which is a control plane interface.
  • MCE Multi-cell/Multicast Coordination Entity
  • the MBMS GW notifies the MCE of the MBMS QoS, Quality of Service parameters, service transmission range and other information through the M3 interface.
  • the MCE determines the transmission mode. There are two transmission modes available in LTE: Single cell (single cell -cell) mode and multi-cell mode.
  • the MBMS can adopt a single frequency network (SFN) mode; the MBMS channel MTCH (MBMS Point-to-Multipoint Traffic Channel) maps to a multicast channel ( On the MCH, Multicast Channel, the point-to-multipoint transmission is performed in multiple cells, and each cell transmits the same data packet at the same time.
  • the user equipment UE, User Equipment
  • the MCE coordinates the air interface resources, including the transmission rate and transmission. Transmit time interval (TTI, Transmission Time Interval), etc., and notify the eNB through the M2 interface; for each MBMS, the MCE allocates a part of the TTI for its use, and when the eNB receives an MBMS packet from the MBMS GW, it can only The MCE allocates the MBMS packet for the MBMS.
  • TTI Transmission Time Interval
  • the UE can implement air interface merging because the data transmission time of each eNB in the Single Frequency Network Area (SFA) needs to be unified in the single-frequency network mode. Therefore, when the MBMS GW sends a data packet to the eNB, a time stamp is added to each data packet, or a time stamp is added every several data packets; after the eNB receives the data packet, for the time-stamped data packet, Then map the time represented by the timestamp to a unique ⁇ , where the packet is sent. Since the MBMS GW only stores the QoS information of the MBMS, it is not clear about the air interface resources actually used.
  • SFA Single Frequency Network Area
  • the transmission time of the MBMS data packet can be determined according to the transmission rate of the MBMS, especially the average rate, and the time for the MBMS data packet is set.
  • the eNB then assigns the timestamp to a specific port to send the MBMS data packet.
  • the MCE also determines the TTI for each MBMS data packet to send.
  • the eNB maps the ⁇ according to the timestamp of a certain MBMS packet (hereinafter referred to as the initial TTI), and may not be allocated to the MBMS by the MCE; or although the initial TTI has been allocated to the MBMS, it has been The data packet before the MBMS data packet is occupied. In both cases, the initial TTI mapped by the eNB for the data packet cannot be used to send the data packet, and another data packet must be searched for. Since each eNB searches for another ⁇ transmission data packet, the actual transmission ⁇ of each eNB may be different for the same data packet, which may cause each eNB in the SFA to be out of synchronization, thereby causing the UE not to correctly receive the MBMS. Summary of the invention
  • Embodiments of the present invention provide a method for MBMS synchronization adjustment, to implement each The actual transmit TTI obtained by the eNB according to the timestamp of the MBMS data packet is the same, thereby ensuring that the UE can correctly receive the MBMS data packet.
  • the embodiment of the present invention further provides an eNB for MBMS synchronization adjustment, so that each eNB obtains the same TTI according to the timestamp of the MBMS data packet, so as to ensure that the UE can correctly receive the MBMS data packet.
  • a method for MBMS synchronization adjustment of a multimedia multicast multicast service comprising: mapping, by an eNB, a timestamp of an MBMS data packet received from an MBMS GW to an initial TTI, and determining whether the initial buffer is available, the available: initial Is assigned to the MBMS for use and is not occupied by other data packets of the MBMS;
  • the actual TTI for transmitting the MBMS data packet is selected, and the selected MBMS data packet is transmitted by using the selected actual data.
  • An eNB includes:
  • a judging module configured to map a timestamp of the MBMS data packet received from the MBMS GW to an initial port, and determine whether the initial port is available;
  • a selection module configured to: when the judgment result of the determining module is initial ⁇ unavailable, select an actual ⁇ of the MBMS data packet;
  • a sending module configured to send the MBMS data packet in an actual port selected by the selecting module.
  • the method and the eNB for the MBMS synchronization adjustment proposed by the embodiment of the present invention can select an appropriate actual TTI for the MBMS data packet to be sent when the initial TTI mapped by the timestamp of the MBMS data packet is unavailable. And the actual ⁇ of the same MBMS data packet is sent by each eNB, so that the MBMS synchronization adjustment is implemented, and the UE can correctly receive the MBMS data packet.
  • FIG. 1 is a schematic structural diagram of a prior art MBMS in LTE
  • FIG. 2 is a flowchart of a method for MBMS synchronization adjustment according to an embodiment of the present invention
  • 3 is a flowchart of a method for processing an MBMS data packet by an eNB according to an embodiment of the present invention
  • 4 is a schematic diagram of a sequence of transmitting an MBMS data packet in a channel multiplexing manner according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a specific implementation of transmitting an MBMS data packet by using an uplink adjustment method of the present invention by the eNB;
  • FIG. 6 is a schematic diagram of a specific implementation of an eNB transmitting an MBMS data packet by using the synchronization adjustment method of the present invention
  • FIG. 7 is a schematic diagram of a specific implementation of an eNB transmitting an MBMS data packet by using a synchronization adjustment method of the present invention
  • FIG. 8 is a schematic diagram of a specific implementation of transmitting an MBMS data packet by using an uplink adjustment method of the present invention by the eNB;
  • FIG. 9 is a schematic structural diagram of an enhanced base station according to an embodiment of the present invention. detailed description
  • FIG. 2 is a flowchart of a method for MBMS synchronization adjustment according to an embodiment of the present invention, including:
  • Step 201 The eNB maps the timestamp of the MBMS data packet received from the MBMS GW to the initial ⁇ , and determines whether the initial ⁇ is available.
  • the available TTI is: the initial TTI is allocated by the MCE to the MBMS, and is not used.
  • the other data packets occupied by MBMS are occupied;
  • Step 202 When the judgment result is unavailable, the actual ⁇ of the MBMS data packet is selected, and the selected MBMS data packet is sent by using the selected actual ⁇ .
  • the eNB when the eNB receives the time-stamped MBMS data packet from the MBMS GW and maps the time stamp to the initial time, it determines whether the following two conditions are met: (1) Whether the initial ⁇ has been allocated by the MCE to the MBMS is used; (2) Whether the initial buffer has been occupied by the front packet of the MBMS.
  • the initial TTI has been allocated by the MCE.
  • the initial TTI is not assigned by the MCE to the MBMS.
  • the initial TTI has been
  • the initial TTI is not sent from the initial TTI at the initial TTI, and the previous packet of the next MBMS is occupied.
  • the available TTI is sent as described in the above table, "following the previous packet transmission", which may refer to An available TTI starts to be sent; it can also be “followed” by cascading of the Radio Link Control (RLC) layer.
  • RLC Radio Link Control
  • the cascading of the RLC layer is described as follows: If the packet of the previous packet is small and does not occupy all of the packets, the previous part of the current packet and the previous packet can be cascaded into one media access control (MAC, Medium) Access Control) package, sent in the same TTI. All eNBs in the same SFA should choose the same processing mode. Which one can be selected by the standard or configured by MCE or Operation and Maintenance (O&M).
  • the available TTI closest to the initial TTI after the initial TTI is selected is the actual TTI.
  • the available ⁇ that is closest to the initial TTI after the initial TTI is selected is the actual TTI.
  • the unavailability is that when the initial ⁇ is allocated to the MBMS by the MCE and is occupied by the pre-packet part of the MBMS packet, the part that is not initially occupied is selected to be sent as the actual TTI; or, after the initial TTI is selected, the initial distance is selected.
  • the most recent available TTI is the actual TTI.
  • FIG. 3 is a flowchart of a manner in which an eNB processes an MBMS data packet according to an embodiment of the present invention.
  • Step 301 After receiving the time-stamped MBMS data packet, the eNB maps the initial ⁇ to determine whether the initial ⁇ has arrived. If yes, step 302 is performed; otherwise, step 301 is continued.
  • Step 302 Determine whether there is a data packet that has not been sent before the data packet. If yes, wait for the previous data packet to be sent, and then select an available TTI to send; if not, go to step 303.
  • Step 303 Determine whether the initial ⁇ has been allocated to the MBMS by the MCE, and if yes, send the MBMS data packet on the initial ;; otherwise, wait for the next ⁇ allocated to the MBMS, and send the MBMS data packet.
  • the two judgments of the above steps 302 and 303 can also be exchanged, that is, it is first determined whether the initial TTI has been allocated to the MBMS by the MCE, and then it is judged whether the initial TTI has been occupied by the pre-packet of the MBMS.
  • the execution method after the judgment is as described in Table 1 above, and will not be described again.
  • Two adjacent MBMS packets if the previous packet has no timestamp, the latter packet has a timestamp, and the transmission time calculated by the eNB for the previous packet conflicts with the transmission time specified by the MBMS GW for the latter packet.
  • the above method can be adopted, that is, the transmission time of the latter data packet is postponed, and then sent after the previous data packet is sent.
  • the previous data packet can be discarded, and the next data packet can be sent at the time specified by the MBMS GW; or one data packet can be sent after the time specified by the MBMS GW, and then the previous data packet is sent.
  • This situation includes but is not limited to:
  • One after the other is a piece of emergency information, such as earthquake warnings, fires, etc.
  • the step of selecting the actual TTI for transmitting the MBMS data packet may include:
  • the unavailable is when the initial TTI is allocated to the MBMS by the MCE and is partially or fully occupied by the pre-packet of the MBMS packet, if the pre-packet has no timestamp, and the MBMS packet belongs to emergency information or Priority is higher than the previous packet, Then the initial TTI is selected to be the actual TTI.
  • the packet with no timestamp is sent immediately before the packet. That is, the foregoing method may further include: the eNB receiving the MBMS data packet without time stamp from the MBMS GW, and selecting the available TTI to send the MBMS data packet.
  • the eNB can measure the difference and request the MCE to change the air interface resource allocation of the MBMS under the appropriate conditions, so that the allocation of the air interface resource is performed. More reasonable.
  • the specific measures and requests can be:
  • the eNB requests the MCE to add the air interface resource; after receiving the request, the MCE sends the request to the single frequency network. All eNBs in the area SFA send an instruction to increase the air interface resource used by the MBMS.
  • the above difference may be the difference of a single measurement, or may be the average of multiple measurements or other statistics.
  • the time difference threshold may be specified by a standard, or may be configured by MCE or O&M.
  • the eNB requests the MCE to reduce the air interface resource; after receiving the request, the MCE sends the MME to all eNBs in the SFA.
  • the above measurement period and the vacant threshold can be specified by the standard or configured by MCE or O&M.
  • the eNB may send the request for adjusting the air interface resource to the MCE again after at least a certain period of time.
  • the specific interval can be configured by the MCE or by the standard. That is, after the MCE sends an instruction to the eNB, the method further includes: after the preset time period, continuing to perform the measurement The amount and the step of requesting the MCE to increase or decrease the air interface resource.
  • the MCE can also report to the MBMS GW through the M3 interface.
  • the timestamp determination algorithm can be dynamically modified. That is, after receiving the request, the MCE may further include: the MCE notifying the MBMS GW to dynamically modify the timestamp determining algorithm.
  • the above method does not consider the scenario in which the eNB joins the SFA during the process of sending a data packet. Since the time at which the eNB actually transmits the data packet in the air interface may deviate from the time specified by the MBMS GW, the eNB newly joining the SFA needs to first know the actual transmission time of other eNBs in the SFA, and then start transmitting the MBMS data packet.
  • the foregoing method may further include: when the eNB joins the SFA, acquiring an actual time for the other eNBs in the SFA to send the MBMS data packet, and transmitting the MBMS data packet synchronously with the other eNB.
  • the way to obtain the actual time when other eNBs send MBMS data packets can be:
  • synchronous transmission with other eNBs may also be implemented by receiving a Reset message from the MCE.
  • the MBMS GW sends a Reset message to the eNB for some time-stamped data packets.
  • the message may be sent to the eNB along with the data packet, or may be sent to the eNB by other means to notify the eNB that the timestamp must be at the time.
  • the most recent available TTI sends the packet.
  • the above method may further include: receiving the Reset message sent by the MBMS GW while receiving the MBMS data packet including the time stamp, and selecting the available ⁇ closest to the time stamp to send the MBMS data packet.
  • the eNB may also negotiate with the other eNBs in the SFA to reset the time point and reset the MBMS data packet, and select the available ⁇ closest to the reset time point to send the reset MBMS data packet. For example: After negotiation, the eNB selects the reset time point as 11:10:20, and resets the MBMS data packet to a data packet with a timestamp of 11:10:20. When the time reaches 11:10:20, the time is selected. After the most recent available, send a packet with a timestamp of 11:10:20.
  • the timestamp of resetting the MBMS data packet may also be earlier than the reset time point. For example, if the eNB selects the reset time point as 11:10:20 and resets the MBMS data packet to a time stamp of 11:10:10, then When the time reaches 11:10:20, the latest available TTI after that time is selected, and the data packet with the timestamp of 11:10:10 is sent.
  • Each eNB in the SFA resets the same data packet at the same time, so that the eNB can synchronously transmit the data packet.
  • the above resets are only for the same MBMS packet, that is, the reset of each MBMS packet does not affect the transmission of other data.
  • the MBMS GW in the existing architecture does not know the channel multiplexing relationship of the MBMS, and the time stamps for each MBMS data packet may be the same.
  • the eNB can sequentially transmit data packets of each MBMS according to the priority of the service or the TMGI.
  • the foregoing method may further include: the eNB receiving data packets of different MBMSs from the MBMS GW, and when the initial TTIs of the data packet timestamps are the same, according to the priority of the MBMS or the temporary mobile group identity (TMGI, Temporary Mobile) Group Identifier ) Sorts packets of different MBMS and sequentially sends packets of each MBMS.
  • TMGI Temporary Mobile Group Identifier
  • Figure 4 is a sequence diagram showing the transmission of MBMS packets in the case of channel multiplexing.
  • the timestamps of packets A1 and B1 are both 11:35:55, the initial data of the two packets is the same.
  • the packet B is sent first in TTI1 (corresponding time is 11:35:55), and then packet Al is sent. If packet B1 is placed in ⁇ 1 and there is still free transmission space, part of packet A1 can be transmitted.
  • Embodiment 1 The specific implementation process of the eNB transmitting the MBMS data packet by using the synchronization adjustment method of the present invention is described in detail below.
  • Embodiment 1
  • FIG. 5 is a schematic diagram of a specific implementation of transmitting an MBMS data packet by using an uplink adjustment method of the present invention by an eNB.
  • the MBMS GW when the MBMS starts, the MBMS GW sends data packets Al, A2, A3, and A4 to the eNB, of which only A1 and A4 are time stamped.
  • the packet length is exactly the same as the RLC split length, and no segmentation is required in the RLC.
  • the air interface transmission time specified by Al and MBMS GW is 11:35:50, and the eNB starts from 11:35:50 to find the TTI allocated by the MCE for the service, and the first available ⁇ found.
  • the corresponding time is 11:35:55. Therefore, the eNB transmits Al at time TTI1.
  • the eNB Since A2 and A3 are not time stamped, the eNB then sends A2 on the available ⁇ 3 and A3 on TTI5.
  • the MBMS GW specifies a transmission time of 11:35:59, and the next available ⁇ 7 corresponds to a time of 11:35:58, so ⁇ 7 is vacant and no data is sent. Wait until the next available ⁇ 9, the corresponding time is exactly equal to the transmission time specified by MBMS GW for A4, so send A4 at ⁇ 9.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 6 is a schematic diagram of a specific implementation of the eNB transmitting the MBMS data packet by using the synchronization adjustment method of the present invention.
  • the difference between this embodiment and the first embodiment is only that the transmission time specified by the MBMS GW for A4 is 11:35:57.
  • the transmission time calculated by the eNB for A4 is ⁇ 5, and the transmission time calculated for A3 is also TTI5. If there is a conflict between the two, A3 is sent in TTI5, and A4 is sent to TTI7.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • FIG. 7 is a schematic diagram of a specific implementation of an eNB transmitting a MBMS data packet by using the synchronization adjustment method of the present invention.
  • the MBMS GW when the MBMS starts, the MBMS GW sends the data packets A1, A2, A3, and A4 to the eNB, and the MBMS GW time stamps the data packet interval, and only Al and A4 are time stamped. Packet length varies, A1 and A4 are longer than RLC segments The degree of A2 is equal to the segment length of the RLC, and the packet length of A3 is smaller than the segment length of the RLC.
  • the air interface transmission time specified by Al and MBMS GW is 11:35:50, and the eNB starts from 11:35:50 to find the TTI allocated by the MCE for the service, and the first available ⁇ found.
  • the corresponding time is 11:35:55. Therefore, the eNB sends the first part of A1 at time TTI1.
  • the second part of A1 is sent in the next available ⁇ 3.
  • the eNB Since A2 has no timestamp, the eNB starts from ⁇ 3, looks for the next available TTI5, and sends A2.
  • A3 also has no timestamp.
  • the eNB starts from ⁇ 5 and looks for the next available TTI7.
  • the absolute time corresponding to ⁇ 7 is 11:35:58, which is later than the transmission time specified by the A4 packet. Therefore, before ⁇ 7 sends the A3 packet and the A4 packet. portion.
  • Embodiment 4 The eNB starts with TTI7 and looks for the next available TTI9, sending the latter part of A4.
  • Embodiment 4 :
  • FIG. 8 is a schematic diagram of a specific implementation of an eNB transmitting an MBMS data packet by using the synchronization adjustment method of the present invention.
  • the difference between this embodiment and the third embodiment is only that the transmission time specified by the MBMS GW for A4 is 11:35:59.
  • the eNB Since the transmission time specified for A4 is 11:35:59, the eNB only sends the A3 packet at ⁇ 7. Since the A3 packet is relatively small, the padding field can be filled in the vacant part of ⁇ 7, or no data is sent.
  • the next available ⁇ 9 corresponds to a transmission time of 11:35:59, which is the same as the transmission time specified by the MBMS GW, so the A4 packet is sent starting from ⁇ 9.
  • the A4 packet is divided, but the division points are different.
  • An embodiment of the present invention further provides an eNB, as shown in FIG. 9, including:
  • the determining module 91 is configured to map a time stamp of the MBMS data packet received from the MBMS GW to an initial port, and determine whether the initial frame is available;
  • the selecting module 92 is configured to select an actual TTI of the MBMS data packet when the determining result of the determining module 91 is initial and not available;
  • the sending module 93 is configured to send the MBMS data packet in the actual UI selected by the selecting module 92.
  • the selection module 92 can be used to:
  • the ⁇ that is closest to the initial ⁇ after the initial ⁇ is selected as the actual ⁇ ; or, when the unavailability is the initial ⁇ is assigned to the MBMS by the MCE And when all the previous data packets of the MBMS data packet are occupied, the available TTI after the initial ⁇ is closest to the initial TTI is the actual TTI;
  • the part that is not occupied by the initial ⁇ is selected as the actual TTI, or after the initial ⁇ is selected The most recent available ⁇ is the actual TTL
  • the method and the eNB for the MBMS synchronization adjustment proposed by the embodiment of the present invention can select a suitable actual TTI for the MBMS data packet by using a different selection manner when the initial timeout of the timestamp mapping of the MBMS data packet is unavailable. And the actual ⁇ of the same MBMS data packet is sent by each eNB, so that the MBMS synchronization adjustment is implemented, and the UE can correctly receive the MBMS data packet.
  • the embodiment of the present invention may also request the MCE to change the air interface resource allocation of the MBMS, so that the allocation of the air interface resource is further reasonable.
  • the present invention can be implemented by hardware, or can be implemented by means of software plus necessary general hardware platform, and the technical solution of the present invention. It can be embodied in the form of a software product that can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for making a computer device (may It is a personal computer, a server, or a network device, etc.) that performs the methods described in various embodiments of the present invention.
  • a non-volatile storage medium which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.
  • a computer device may It is a personal computer, a server, or a network device, etc.

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Abstract

Cette invention concerne un procédé de réglage de synchronisation pour un service multidiffusion de radiodiffusion multimédia et une station de base améliorée. Le procédé comprend les étapes suivantes: eNB mappe l'horodatage du paquet MBMS reçu depuis GW passerelle MBMS avec un intervalle temporel de transmission de départ TTI puis il évalue si le TTI de départ est utilisable. A l'état utilisable: le TTI de départ est attribué à MBMS afin d'être utilisé et il n'est pas occupé par d'autres paquets de MBMS. Le eNB sélectionne un TTI en cours pour envoyer le paquet MBMS lorsque le résultat de l'évaluation révèle que le TTI de départ n'est pas utilisable et il utilise le TTI en cours sélectionné pour envoyer le paquet MBMS. Le procédé et le eNB décrits dans cette invention permettent de garantir que chaque eNB envoie le même paquet MBMS au même TTI en cours, permettant également la mise en oeuvre d'un réglage de synchronisation pour le MBMS et garantissant une réception correcte du paquet MBMS par l'équipement utilisateur (UE).
PCT/CN2008/072716 2007-10-31 2008-10-16 Procédé de réglage de synchronisation pour service multidiffusion de radiodiffusion multimédia et station de base améliorée WO2009062436A1 (fr)

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