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WO2009021436A1 - Procédé d'envoi d'un paquet de données mbms et dispositif et système l'utilisant - Google Patents

Procédé d'envoi d'un paquet de données mbms et dispositif et système l'utilisant Download PDF

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Publication number
WO2009021436A1
WO2009021436A1 PCT/CN2008/071883 CN2008071883W WO2009021436A1 WO 2009021436 A1 WO2009021436 A1 WO 2009021436A1 CN 2008071883 W CN2008071883 W CN 2008071883W WO 2009021436 A1 WO2009021436 A1 WO 2009021436A1
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WIPO (PCT)
Prior art keywords
data packet
time
rnc
mbms data
air interface
Prior art date
Application number
PCT/CN2008/071883
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English (en)
Chinese (zh)
Inventor
Bo Lin
Jie Ma
Original Assignee
Huawei Technologies Co., Ltd.
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
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009021436A1 publication Critical patent/WO2009021436A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/12—Messaging; Mailboxes; Announcements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

Definitions

  • the present invention relates to a Multimedia Broadcast/Multicast Service (MBMS) technology, and in particular, to a method and an apparatus for transmitting an MBMS data packet.
  • MBMS Multimedia Broadcast/Multicast Service
  • MBMS technology broadcasts or multicasts multimedia data to user equipment (UE, User Equipment) by sharing a transmission link.
  • the MBMS control signaling and the service data are transmitted on the broadcast channel of the air interface, so authorized users in the connected state and the idle state can read the control signaling and the service data, thereby enjoying the MBMS service.
  • the services provided by MBMS technology to users are mainly sound, image and video, so the business data received by users cannot be obviously interrupted and shaken.
  • MBMS technology was introduced in the Universal Mobile Telecommunications System (UMTS) to provide MBMS services using the UMTS network.
  • UMTS Universal Mobile Telecommunications System
  • HSPA+ High Speed Packet Access Plus
  • LTE Long Term Evolution
  • MBMS technology is constantly being optimized.
  • MBMS services are still Need to be supported by each network.
  • the MBMS technology has a soft merge/selective merge mechanism between cells within the range of the Radio Network Controller (RNC).
  • RNC Radio Network Controller
  • the basic process of soft combining is that the user receives data from two cells at the same time, and superimposes the signals to superimpose them, thereby realizing enhanced signals and reducing errors.
  • Soft combining requires that the MBMS data of two cells be sent to the user for a certain period of time, and the precision is controlled at the transmission time interval (TTI, Transmission Time). Interval) level.
  • TTI Transmission Time
  • the RNC is uniformly responsible for MBMS scheduling of cells in the RNC range, and the RNC receives the MBMS data packet from the Serving General Packet Radio Service Support Node (SGSN), and then synchronizes through the node.
  • Mechanisms such as transmission channel synchronization, adjusting relevant parameters of each cell, determining a frame number, and selecting a transmission time point for transmitting the MBMS to each NodeB; the NodeB has only a physical layer, and can only follow the frame number specified by the RNC. The time corresponding to the frame number transmits the data, which finally ensures the synchronization of MBMS data between these cells.
  • the HSPA+ system combines the traditional RNC function with the traditional base station (NodeB) function to construct a new device.
  • This device can be called Evolved HSPA NodeB. ⁇ + (or NodeB+).
  • the inter-cell soft combining in the HSPA+ system that is, between NB+ and between neighboring cells within NB+, has a soft combining mechanism.
  • LTE Long-term evolution base station
  • RAN radio access network
  • SFN merging in an LTE network is characterized in that two eNBs transmit the same MBMS data packet at the same frequency and at the same time.
  • networks (traditional UMTS, HSPA+, and LTE networks) will mix networks and provide services to the UEs.
  • networks such as HSPA+ network and A traditional UMTS network hybrid network, or a traditional UMTS network and an LTE network hybrid networking. So different networks may cover a certain area at the same time, or different networks may have a junction, so that the UE may move or switch/relocate from one network to another.
  • the service interruption time of the UE switching channel cannot exceed 1 second.
  • the service interruption time should be as small as possible, at least the user cannot be obviously perceived.
  • Embodiments of the present invention provide a method for transmitting an MBMS data packet, an RNC, and a CN device, which are implemented in a UTMS network, and can send an MBMS data packet at a specific air interface transmission time.
  • an embodiment of the present invention provides a method for transmitting a MBMS data packet of a multimedia broadcast multicast service, including:
  • the radio network controller RNC receives the MBMS data packet, and obtains the air interface sending time of the MBMS data packet;
  • the time at which the MBMS data packet is transmitted is determined, and the MBMS data packet is transmitted at the time.
  • the core network CN device predetermining the length of time that the data packet is sent from the CN device until being sent out from the air interface, and the method includes:
  • the CN device determines to send the MBMS to the radio network controller RNC according to the air interface transmission time of the MBMS data packet and the length of time that the data packet is sent from the CN device to the air interface. Packet time
  • a radio resource controller RNC comprising a receiving module, an obtaining module, a sending time determining module and a sending module,
  • the receiving module is configured to receive a MBMS data packet of a multimedia broadcast multicast service
  • the obtaining module is configured to acquire an air interface sending time of the MBMS data packet
  • the sending time determining module is configured to determine, according to an air interface sending time of the acquiring module, a time for sending the MBMS data packet;
  • the sending module is configured to send the MBMS data packet when the MBMS data packet is sent.
  • a core network CN device including a duration determining module, a sending time determining module, and a sending module,
  • the duration determining module is configured to determine a duration of time when the data packet is sent from the CN device to the air interface;
  • the time determining module is configured to determine, according to the air interface sending time of the multimedia broadcast multicast service MBMS data packet, the time period that the data packet determined by the duration determining module is sent from the CN device to the air interface, and determine the RNC to the radio network controller. The time when the MBMS data packet is sent; the sending module is configured to send the MBMS data packet to the RNC at a time determined by the time determining module.
  • 1 is a flowchart of a method for transmitting an MBMS data packet in a UMTS network according to an embodiment of the present invention
  • 2 is a schematic diagram of a method for a first RNC to obtain an MBMS data packet air interface transmission time according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a method for obtaining an air interface transmission time of an MBMS data packet by a second RNC according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for calculating a frame number by an RNC according to an embodiment of the present invention
  • FIG. 5 is a flow chart of a method for transmitting an MBMS data packet in a UMTS network according to another embodiment of the present invention.
  • FIG. 6 is a flowchart of a method for acquiring information required for merging based on an Iur interface according to an embodiment of the present invention
  • FIG. 7 is a flowchart of a method for acquiring information required for merging based on an Iu interface according to an embodiment of the present invention
  • the technical solution provided by the embodiment of the present invention improves the processing mode of the traditional UMTS, so that the UMTS network adjusts the data packet sending time and related parameters of each interface, implements the UMTS transmission time at a specific air interface, and sends the MBMS data packet, thereby making the MBMS
  • the data packets are transmitted in the UMTS network in the same manner as the air interface transmission time in the HSPA+ or LTE network, and the data content of the MBMS data packets in these networks is synchronized.
  • the RNC calculates and sets the frame number of the MBMS data packet according to the air interface transmission time, so that the UMTS network transmits the MBMS data packet at a specific air interface transmission time.
  • Step 100 The RNC receives the MBMS data packet, and obtains an air interface sending time of the MBMS data packet.
  • the RNC obtains the air interface transmission time of the MBMS data packet in two ways.
  • the first method is: before the step is performed, when the upstream core network (CN, Core Network) device of the RNC sends the MBMS data packet to the RNC,
  • the air interface transmission time information is added to the data packet, including the air interface transmission timestamp or the air interface transmission relative time, such as the packet number that can correspond to the time.
  • the data packet carrying the air interface transmission time information is sent to the RNC.
  • the first example of the present invention is to obtain the air interface sending time of the MBMS data packet.
  • the upstream device of the RNC may be a CN device, and the upstream device sends the MBMS data packet carrying the air interface sending time information.
  • the RNC to the UMTS network, the NB+ of the HSPA+ network, and the eNB of the LTE network.
  • the same data packet of the same MBMS service is basically the same in the transmission time of the two networks.
  • the service is not jittery, or the MBMS data received by the user equipment from the three networks can be combined, and the content synchronization of the MBMS data needs to be implemented, and the CN device sends the MBMS data packet to the RNC, the NB+, and the eNB.
  • the air interface transmission time information is added to the data packet, and after receiving the MBMS data packet, the RNC, the NB+, and the eNB analyze the data packet to obtain the air interface transmission time of the data packet, and send the time at the air interface transmission time.
  • the traditional RNC After receiving the MBMS data packet, the traditional RNC first parses the air interface sending time of the data packet, and then performs step 101. In this step, the RNC parses the MBMS data packet carrying the air interface transmission time information, and the process of obtaining the air interface transmission time is a prior art, and details are not described herein again.
  • the CN device can send the MBMS data packet to the RNC, NB+, and eNB through IP multicast mode or unicast mode. Regardless of the way the CN device sends MBMS packets, all RNCs
  • the data acquired by the CN device is the same, that is, the air interface transmission time of all the data packets received by the RNC is the same.
  • the RNC maps the relative time or packet number to an absolute time. For example, when the MBMS service starts, the CN device sends a correspondence between the MBMS packet number and the air interface transmission time to the RNC. For example, the correspondence includes the first packet (packet number 1) and the sending time is 12:00:00 00. , the subsequent data packet transmission interval between each packet is 10ms. That is to say, when the packet number of the data packet is 2, the sending time of the representative is 12:00:00 10, and so on.
  • the correspondence may also include the sending time of the two packets, and the RNC calculates the sending time interval between each data packet according to the sending time of the two packets, thereby further obtaining the time corresponding to the current packet number. Therefore, the RNC only needs to obtain this mapping relationship from the CN device, and then the air interface transmission time can be obtained according to the packet number.
  • the RNC can directly obtain the air interface transmission time according to the time stamp.
  • the second is determined by the RNC according to the Iur interface transmission delay between the RNC and the NB+, the internal processing time of the NB+ packet, the lub interface transmission delay between the RNC and the NodeB, and the internal processing time of the NodeB for the data packet.
  • a suitable air interface sends the time.
  • the MBMS data packets of the NB+ and the NodeB are sent by the traditional RNC. Therefore, the traditional RNC needs to calculate and set.
  • the air interface of each MBMS packet is sent to ensure the synchronization of the content of the MBMS packets sent by the NodeB and the NB+.
  • the RNC may set the air interface transmission time in the MBMS data packet sent to the NB+, and after receiving the MBMS data packet, the NB+ may parse the air interface transmission time of the data packet, where When the time arrives, it can be sent directly on the air interface; for the data packet sent to the NodeB, step 101 is also performed.
  • Step 101 The RNC calculates and sets a frame number for the MBMS data packet according to the obtained air interface transmission time.
  • the RNC calculates and sets a frame number for each packet sent to the NodeB, which will ultimately determine when the NodeB will send the packet from the air interface.
  • the RNC In order to calculate the frame number, the RNC needs to first calculate the offset RFN_BFN_OFFSET between the RNC frame number (RFN) and the NodeB frame number (BFN) or system frame number (SFN). For example, the RNC can calculate the RFN-BFN-OFFSET by means of node synchronization, transmission channel synchronization, and the like. Since the range of values and time units of RFN, BFN and SFN are the same, FFN or SFN can be calculated by RFN and RFN-BFN-OFFSET.
  • the connection frame number (CFN) corresponding to the RFN is fixed.
  • the method for calculating the frame number by the RNC in step 101 includes the following steps:
  • T_ stamp Indicates the air interface transmission time of the MBMS packet, such as the timestamp. For absolute time, in milliseconds. T—now: Indicates when the RNC receives the MBMS packet. For absolute time, in milliseconds.
  • T The time that the RNC should send to the NodeB at the Iub port after receiving the MBMS packet.
  • RFN—Target Indicates the RFN when the RNC sends the MBMS packet.
  • BFN—Target Indicates the BFN when the RNC sends the MBMS packet.
  • CFN—Target Indicates the frame number CFN that the RNC will calculate and set for this MBMS packet.
  • RFN BFN OFFSET The offset of RFN from BFN (equal to the offset between RFN and SFN).
  • Step 400 The RNC determines the difference between the air interface sending time of the data packet and the current time.
  • the RNC calculates the T-difference.
  • Step 401 The RNC determines whether the difference is less than 0, if yes, step 402 is performed; otherwise, step 403 is performed.
  • T_ difference ⁇ When the RNC receives a data packet, if T_ difference ⁇ 0, it indicates that the specified air interface transmission time has passed, which is an abnormal situation. If the air interface transmission time of the data packet is set by the upstream device, and the IP multicast transmission is used between the RNC and the upstream device, it may be IP multicast transmission. There is some abnormality in the quality.
  • Step 402 The RNC returns an error message and ends the process.
  • the RNC reports the error information to the upstream device to notify it to adjust the time scheduling policy or adjust the routing configuration.
  • Step 403 The RNC calculates the number of cycles of the RFN and the offset value backward.
  • T_ difference > 40960ms, indicating that the time difference is greater than or equal to one RFN cycle, it is necessary to calculate several RFN cycles.
  • A be the number of cycles of RFN or BFN or SFN (RFN/BFN/SFN) after the RNC receives the packet. That is, the next few RFN/BFN/SFN cycles are indicated; B is the offset value of the RFN backward; D is the offset of time, and its value ranges from 0 to 9 ms, because the unit of time offset is ms.
  • the frame number can only express a granularity of 10ms, so this value is needed to improve the accuracy of the calculation.
  • the TTI can be 2ms in HSDPA, so a packet sequence number needs to be set in the HS-DSCH transport channel data frame.
  • T_ difference When T_ difference > 0, T- difference can be decomposed into the following equation:
  • T_difference A* 40960+ B*10 + D.
  • A, B, and D can be calculated by the following methods:
  • D (T - difference mod 40960) mod 10.
  • the TTI sequence number can be determined according to the value of D.
  • Step 404 Calculate a frame number according to the backward offset value of the RFN.
  • CFN ( SFN - Frame Offset ) mod 256 (The Frame Offset is the time value corresponding to the field "FDD S-CCPCH Frame Offset". When the field is valid, the value can be 1, 2, 4, and the unit is 10ms. When invalid, it is considered to be 0.)
  • the RNC may determine that the CFN frame number set for the MBMS packet is: the sum of the offset between the current RFN and the RFN and BFN, plus the offset value of the RFN backward, and then subtract the frequency division duplex auxiliary common control physics. The channel frame offset value, and finally the remainder of 256, see Equation 1.
  • each forward access channel FACH, Forward Access Chnnel
  • FACH Forward Access Chnnel
  • MBMS data is on the Iub interface
  • each The FACH channel is transmitted separately, and in Equation 1, the RFN_BFN_OFFSET and Frame offset parameters are cell-related. Therefore, when the RNC transmits the MBMS data packet in this manner, the RMS can directly calculate and send the MBMS data by using Equation 1.
  • the frame number of the packet since MBMS data of multiple cells on the same NodeB correspond to multiple FACH channels, and MBMS data is on the Iub interface, each The FACH channel is transmitted separately, and in Equation 1, the RFN_BFN_OFFSET and Frame offset parameters are cell-related. Therefore, when the RNC transmits the MBMS data packet in this manner, the RMS can directly calculate and send the MBMS data by using Equation 1. The frame number of the packet.
  • the MBMS data packet When the MBMS data packet is transmitted in the Iub interface in the Iub interface mode, only one copy of the FACH data sent by the RNC to each cell on each NodeB, and RFN_BFN_OFFSET in Equation 1 is used by each NodeB.
  • the offset of the RNC, the frame offset parameter is related to the cell, and the frame offset of different cells under one NodeB may be different, so the CFN-Target result calculated by using Equation 1 and different Frame offsets of each cell is different. Therefore, one way for the RNC to calculate the frame number is to ignore the Frame offset, that is, the value does not participate in the calculation.
  • the basic content synchronization requirements can still be met.
  • the RNC will first use the Iub before calculating the frame number.
  • the frame offset of the transmission channel that is transmitted in the mode is the same, for example, it can be set to 0. In this way, the time precision of the air interface transmission can be guaranteed, which is basically strictly aligned, and the content synchronization required by soft combining or SFN combining can be further realized.
  • the MBMS data packet is transmitted by the RNC to the NodeB by the IP multicast mode, only one copy of the FACH data sent by the RNC to multiple cells on the multiple NodeBs is carried by the IP multicast.
  • the RFN_BFN_OFFSET of the different NodeBs and the RNC are different, and the data sent by the RNC is only one copy. Therefore, the data packet must be filled with a uniform frame number, and the NodeB performs the deviation according to the RNC.
  • the corresponding adjustment For example, the RNC can set the RFN BFN OFF SET to 0 when calculating the frame number, and obtain the relative frame number of the MBMS packet.
  • the NodeB When the NodeB receives the data packet, the RFN_BFN_OFFSET and the 256 value are added. After receiving the frame number, and then taking the remainder of 256, a new frame number is obtained, and the MBMS data packet is sent according to the new frame number.
  • Frame offset processing is similar to the two processing methods in the case of Iub sharing. According to different synchronization precision requirements, you can choose: Ignore or RNC will set the Frame offset of the transmission channel transmitted by IP multicast mode to be consistent.
  • Step 405 Set the calculated frame number in the MBMS packet.
  • the frame number set for the MBMS packet can be either CFN or other frame number of the CFN.
  • the frame number may be a CFN relative frame number obtained by setting RFN_BFN_OFFSET to 0, and each NodeB calculates a CFN based on the CFN relative frame number.
  • Step 102 The RNC determines the time for sending the MBMS data packet to the NodeB. After the time is reached, the MBMS data packet is sent to the NodeB.
  • the time when the RNC sends the MBMS data packet to the NodeB is T-RNC_Target. It is determined according to the number of cycles A and RFN_Target of the RFN /BFN/SFN, that is, the MBMS packet is sent to the NodeB on the RFN_Target of the RFN after the A cycle. However, if you want to consider factors such as the transmission jitter of the lub interface, you can appropriately advance a value related to the maximum jitter parameter of the transport layer.
  • the NodeB sends the packet out of the air interface on the frame number in the MBMS packet.
  • the method of the foregoing embodiment of the present invention may not perform the process of calculating the frame number in step 101, but only set the frame number of the data packet according to the prior art scheme, and determine the RNC. After the time of sending the MBMS packet, it is sent to the NodeB.
  • This implementation has a low accuracy in transmitting data packets, but in the case where the accuracy of MBMS data content synchronization is not high, this implementation can also be used to achieve data content synchronization and data merging.
  • the RNC acquires the air interface transmission time of the MBMS data packet, determines the time for sending the MBMS data packet to the NodeB according to the air interface transmission time, and sends the time at the time, so that the UMTS network can send the time in the specific air interface. Send the received MBMS packet out.
  • the CN device first determines the length of time that the data packet is sent from the core network to the air interface, and then determines the time to send the data packet to the RNC according to the air interface transmission time, and sends the data packet to the RNC at the time, and is sent by the RNC.
  • the NodeB After processing according to the method in the prior art, the NodeB sends out, so that the UMTS network sends the data packet at a specific air interface sending time.
  • FIG. 5 is a flowchart of a method for transmitting an MBMS data packet according to another embodiment of the present invention. As shown in Figure 5, the method includes the following steps:
  • Step 500 The CN device predetermines the length of time that the data packet is sent from the CN device until it is sent out from the air interface.
  • the length of time that the data packet is sent from the CN device until it is sent out from the air interface includes two parts, one part is the transmission delay Time_Iu_delay of the CN equipment to the RNC, and the other part is that the RNC receives the data packet until the data packet is from the data packet.
  • the RNC For the RNC in the existing UMTS network, there is no air interface to send time information in the received data packet, and the RNC considers it to be sent immediately. Therefore, the RNC sets the CFN to the packet sent from the Iub according to the condition of each cell, and then sends the data to the NodeB, and the NodeB sends the data on the frame number.
  • the CFN frame number corresponds to an air interface transmission time, so the RNC can know the time when the data packet is sent on the air interface.
  • the RNC can calculate the value of this Time-From- RNC-TO-AIR.
  • Time—From— RNC—TO—AIR can be seen as the Iub transmission delay Time—Iub—Delay force.
  • Time—Iub—Delay can be obtained by the node measurement method of the RNC and NodeB of the prior art, and the Frame Offset is set by the RNC. So using the existing technology, RNC can calculate the value of Time_From- RNC-TO-AIR.
  • the RNC needs to report Time_From- RNC-TO-AIR to the CN device in a message.
  • the RNC reports the packet to the CN device.
  • Time—Iu—delay can be obtained by measurement.
  • the CN device sends a measurement request to the RNC, and carries the CN device to send the time T1.
  • the RNC determines the RNC reception time T2.
  • the measurement response which carries Tl, T2, RNC transmission time T3.
  • the CN device receives the time T4. Then the CN device can calculate Time_Iu_delay by the following formula:
  • Time—Iu— delay ( ( T2-T1 ) + ( T4-T3 ) ) /2.
  • Time—Iu— delay ( T4-T1 ) II.
  • Step 501 The CN device sends a time Time_Send_over_air according to the air interface of the MBMS data packet, and a time period when the data packet is sent from the CN device to the air interface, and the time for sending the MBMS data packet to the RNC is determined, and The time is sent out.
  • the CN device can obtain the air interface transmission time of the MBMS data packet, which may be generated by the CN device itself, or obtained by the CN device from its upstream device.
  • Step 502 The RNC sends the MBMS data packet through the NodeB.
  • This step is the same as the process in which the existing RNC sends the MBMS packet through the NodeB, and will not be described here.
  • the CN device determines the length of time that the data packet is received from the RNC until it is sent from the air interface, and the transmission delay between the CN device and the RNC, and the time of sending the data packet to the RNC can be determined by combining the air interface transmission time of the data packet.
  • the UMTS network transmits the data packet at a specific air interface transmission time.
  • the embodiment of the present invention In order to implement the MBMS data content synchronization between the RNC/NodeB and the NB+ of the HSPA+ network or the eNB of the LTE network, the embodiment of the present invention also needs to implement time synchronization between the RNC/NodeB and the NB+ of the HSPA+ network or the eNB of the LTE network.
  • the method of synchronization can use the prior art, and will not be described here.
  • the transmission provided based on the two embodiments of the present invention described above is described in detail below.
  • the MBMS packet method implements the MBMS data merge process.
  • the NB+/eNB parses the air interface transmission time, and buffers the data packet until the air interface transmission time, and sends the data packet from the air interface. .
  • the received MBMS data packet can be sent out from the air interface at a specific air interface transmission time by using the methods in the two embodiments described above.
  • the content synchronization of the MBMS data packet can be realized.
  • the method further includes: acquiring or exchanging information required for soft combining/selective combining between the RNCs, or between the RNC and the NB+, including frequency, scrambling code, and various scheduling period information.
  • the obtained soft merge/selective merge required information is sent to the user equipment, and the air interface transmission time carried in the MBMS data packet is parsed, and the data packet is cached until the air interface
  • the MBMS data packet is sent out, and the MBMS data packet may be an MBMS data packet that is sent by the RNC to determine the air interface transmission time, or is sent by the CN device of the upstream device of the RNC. Send time MBMS packets.
  • the UMTS network that receives the MBMS data packet also sends the obtained soft merge/selective merge required information to the user equipment, and uses the method of the embodiment of the present invention to send the MBMS data packet at the set air interface transmission time.
  • the user equipment that simultaneously receives the MBMS data packet from the NB+ and the NodeB implements soft combining of the MBMS data packet based on the information required for soft combining/selective combining.
  • the process of implementing the soft combining of the MBMS data packet by the user equipment based on the information required for the soft combining/selective combination is a prior art, and details are not described herein again.
  • FIG. 6 is a flowchart of a method for acquiring information required for merging based on an Iur interface according to an embodiment of the present invention.
  • the RNC/NB+ sends a neighbor cell information request to an adjacent RNC/NB+, and is replied by the neighboring RNC/NB+.
  • the neighbor cell information report thereby obtaining the information required for the merge.
  • FIG. 7 is a flowchart of a method for acquiring information required for merging based on an Iu interface according to an embodiment of the present invention.
  • RNC/NB+ sends a neighbor cell information request to a neighboring RNC/NB+ through a CN, by a neighboring RNC/ NB+ replies to the neighbor cell information report through the CN, thereby obtaining the information required for the merge.
  • the embodiment of the present invention further includes: setting a secondary common control physical channel offset (SCCPCH offset) and/or an SFN and a BFN offset (T_cell) of each cell to be consistent when calculating the frame number.
  • SCCPCH offset secondary common control physical channel offset
  • T_cell BFN offset
  • the radio resources of the two cells including the frequency and the scrambling code, are the same. Therefore, in order to coordinate the frequency and scrambling code of the neighboring cells between the two networks, it is necessary to add a logical coordination device to coordinate the radio resources of the RNC/NB+, such as assigning a scrambling code of a certain service.
  • the coordinating device and the RNC/NB+ need to add related interfaces/processes/messages/IEs for coordinating radio resources with the RNC/NB+, and the coordinating device may be located at the RNC/NB+, CN, etc., or may be an independent entity.
  • the coordinating device is placed in the RNC or NB+, then the related procedure/message/IE needs to be added on the Iur interface or the Iu interface; if the coordinating device is placed in the core network, the related procedure/message/IE needs to be added to the Iu interface; If this coordination device is a separate entity, then you need to add Add an interface to RNC/NB+.
  • FIG. 8 is a flowchart of a method for performing radio resource coordination based on an Iu interface according to an embodiment of the present invention.
  • the RNC/NB+ sends a radio resource protocol request to the coordinating device.
  • the coordinating device After receiving the coordinating device, the coordinating device returns a radio resource protocol indication to the RNC/NB+ to allocate radio resources for the MBMS service.
  • the NB+ receives the MBMS data packet that carries the air interface transmission time.
  • the MBMS data packet may be an MBMS data packet that is sent by the RNC to determine the air interface transmission time, or is sent by the upstream device CN device of the RNC.
  • the MBMS packet of the sending time then, based on the allocated radio resource, the MBMS data packet is sent out at the air interface sending time; the NodeB is also based on the allocated radio resource, and the MBMS is set on the frame number corresponding to the set air interface sending time.
  • the data packets are sent out, so that the MBMS data sent by the two networks can be combined in the air interface, thereby implementing SFN merging.
  • the embodiment of the present invention further provides an RNC, where the RNC specifically includes: a receiving module, an obtaining module, a sending time determining module, and a sending module, where the receiving module is configured to receive an MBMS data packet, and the acquiring module is configured to obtain MBMS data. a sending time of the packet; a sending time determining module, configured to determine, according to the air interface sending time acquired by the acquiring module, a time for sending the MBMS data packet; and a sending module, configured to send the MBMS data packet determined by the sending time determining module At the time, the MBMS packet is sent out.
  • the RNC specifically includes: a receiving module, an obtaining module, a sending time determining module, and a sending module, where the receiving module is configured to receive an MBMS data packet, and the acquiring module is configured to obtain MBMS data.
  • a sending time of the packet a sending time determining module, configured to determine, according to the air interface sending time acquired by the acquiring module, a time for
  • the receiving module and the sending module may be combined into a transceiver module, the transceiver module is configured to receive a multimedia broadcast multicast service MBMS data packet, and send the MBMS data packet at the time determined by the sending time determining module, and send the MBMS data packet Send out
  • the RNC may further include a calculation setting module for calculating and setting a frame number for the MBMS data packet according to the air interface transmission time.
  • a merge information acquisition module may be further included for acquiring or exchanging soft merge required information with an adjacent RNC or NB+.
  • the RNC may further include A coordinating device, configured to allocate radio resources for MBMS services of the UMTS network and the HSPA+ network.
  • the embodiment of the present invention further provides a wireless communication network, where the network includes an RNC, and the RNC is configured to receive an MBMS data packet, and obtain an air interface sending time of the MBMS data packet, according to the Obtaining an air interface transmission time acquired by the module, determining a time for transmitting the MBMS data packet, and transmitting the MBMS data packet.
  • the embodiment of the invention further provides a CN device, including a duration determining module, a sending time determining module and a sending module.
  • the duration determining module is configured to determine a duration of time when the data packet is sent from the CN device to the air interface, and the time determining module is configured to send, according to the air interface sending time of the MBMS data packet, the data packet determined by the module to be sent from the CN device until The time sent from the air interface determines the time when the MBMS data packet is sent to the RNC; the sending module sends the MBMS data packet to the RNC at the time determined by the time determining module.
  • the CN device in the embodiment of the present invention refers to an upstream device of the RNC, and is generally a device in the core network, and may be, for example, an SGSN or a Gateway General Packet Radio Service Support Node (GGSN). .
  • GGSN Gateway General Packet Radio Service Support Node
  • the embodiment of the present invention further provides another wireless communication network, where the network includes a CN, and the CN is used to determine the length of time that the MBMS data packet is sent from the CN device to the air interface, according to the MBMS.
  • the air interface transmission time of the data packet and the time length of the MBMS data packet sent from the CN device to the air interface are determined, and the time for transmitting the MBMS data packet to the RNC is determined.
  • the RNC After receiving the MBMS data packet, the RNC obtains the air interface sending time of the data packet, calculates and sets a frame number for the data packet according to the air interface sending time, and then sends the frame number, so that the NodeB can calculate the time according to the air interface sending time at the RNC.
  • the NodeB can send the data packet according to the frame number calculated by the RNC according to the air interface transmission time, thereby realizing the UMTS in the specific The air interface sends the time and sends the MBMS out.
  • the CN device predetermines the duration of time when the data packet is sent from the CN device to the air interface, and determines, according to the duration and the air interface sending time of the MBMS data packet, that the CN device sends the data to the RNC.
  • the UMTS network can send the data packet according to the air interface transmission time of the MBMS data packet, and the NB+ of the HSPA+ can also be sent in the designated air interface. Time, the MBMS data packet is sent out, so that the MBMS data content synchronization between the UMTS network and the HSPA+ network can be realized.
  • the MBMS service remains smooth without letting the user feel the MBMS. Business jitter.
  • the UMTS network When the UMTS network is co-networked with the LTE network, the UMTS network sends the data packet according to the air interface transmission time of the MBMS data packet, and the MBMS data packet of the LTE network is also guaranteed by the eNB. Sending time transmission at the specified air interface, thereby realizing MBMS data content synchronization between the UMTS network and the LET network.
  • the MBMS service remains smooth without letting the user feel the MBMS service. Jitter.
  • the relevant RNC of the UMTS network calculates and sets an appropriate CFN according to the transmission time of the MBMS data packet at the air interface.
  • the frame number enables the NodeB to guarantee the transmission time at the specified air interface.
  • the RNCs operate independently, they can guarantee that the corresponding transmission time is determined for the same packet, and the frame number can be at least 10ms (-frames), so that the internal UMTS network can be implemented.
  • the data content is synchronized.
  • the synchronization precision of the solution provided by the embodiment of the present invention can reach at least the TTI level, so that the requirement of soft combining synchronization precision can be satisfied.
  • SFN synchronization implements chip-level merging, and signals from different cells are combined in the air interface, and the signal synchronization precision is chip.
  • the SCCPCH offset of each cell should also be consistently set, and further T-cell can maintain consistent settings, thereby making the synchronization accuracy of the scheme. It can reach the chip level and meet the accuracy requirements of SFN synchronization.
  • the legacy UMTS R6 version has a soft merge mechanism
  • the legacy UMTS R7 version has an SFN merge mechanism
  • the HSPA+ network has a soft merge mechanism, and may further implement SFN merge
  • the LTE network has an SFN merge mechanism. Therefore, after using the technical solution of the embodiment of the present invention, the user at the interface between the network after the UMTS R6 and the HSPA+ network can obtain the gain from the soft combination of the two networks; the network of the UMTS supporting the SFN and Users who support the SFN's HSPA+ network junction location can derive gain from the SFN combination of the two networks.
  • the quality of the MBMS service signal at the edge of the network may not be very good.
  • the invention can further be implemented in UMTS Between each RNC in the network, or between the UMTS network and the HSPA+ network, content synchronization required at the level required for soft combining, or content synchronization required at the level required for SFN merging, thereby providing a combined synchronization basis for soft combining or SFN merging. Based on this synchronization, soft combining or SFN merging between RNCs can be achieved, which in turn has a beneficial effect on signal enhancement at the network connection.
  • the RNC obtains the air interface sending time of the MBMS data packet, determines the time for sending the MBMS data packet to the NodeB according to the air interface sending time, and sends the time at the time, so that the UMTS network can The received MBMS data packet is sent out at a specific air interface transmission time.
  • the CN device predetermines the duration of time when the data packet is sent from the CN device to the air interface, and determines, according to the duration and the air interface sending time of the MBMS data packet, that the CN device sends the data to the RNC.
  • the air interface transmission time of the MBMS data packet in the UMTS network is consistent with the air interface transmission time of the HSPA+ network/LTE network, and the MBMS data content synchronization is realized.
  • the content of the MBMS service is guaranteed to be continuous and synchronized.

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

Abstract

La présente invention concerne un procédé pour envoyer un paquet de données MBMS (service de diffusion/multidiffusion multimédia), qui comprend les étapes suivantes : le RNC (contrôleur de réseau radio) reçoit le paquet de données MBMS, en obtenant l'heure d'envoi nul du paquet de données MBMS ; on détermine l'heure d'envoi du paquet de données MBMS en fonction de l'heure d'envoi nul et le paquet de données MBMS est envoyé à ce moment-là. L'invention concerne aussi un dispositif de RNC et un réseau central (CN). Grâce à ces solutions, l'UMTS (système de télécommunications mobiles universel) envoie le paquet de données MBMS en fonction de l'heure d'envoi nul et synchronise donc l'UMTS et le réseau HSPA+ (accès plus au paquet haut débit) d'évolution avec le contenu du paquet de données MBMS du réseau LTE (évolution à long terme).
PCT/CN2008/071883 2007-08-10 2008-08-06 Procédé d'envoi d'un paquet de données mbms et dispositif et système l'utilisant WO2009021436A1 (fr)

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CN102843344B (zh) * 2011-06-24 2015-02-04 中怡(苏州)科技有限公司 微型基地台的信号传输方法
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