WO2016106755A1 - Procédé, dispositif et système de prise en charge de transmission de service de diffusion mbms - Google Patents

Procédé, dispositif et système de prise en charge de transmission de service de diffusion mbms Download PDF

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Publication number
WO2016106755A1
WO2016106755A1 PCT/CN2014/096067 CN2014096067W WO2016106755A1 WO 2016106755 A1 WO2016106755 A1 WO 2016106755A1 CN 2014096067 W CN2014096067 W CN 2014096067W WO 2016106755 A1 WO2016106755 A1 WO 2016106755A1
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Prior art keywords
mbms
identifier
access device
wireless access
cell
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PCT/CN2014/096067
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English (en)
Chinese (zh)
Inventor
李元杰
张屹
王婷
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华为技术有限公司
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.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480084497.8A priority Critical patent/CN107113575B/zh
Priority to PCT/CN2014/096067 priority patent/WO2016106755A1/fr
Priority to CN201580072128.1A priority patent/CN107113781B/zh
Priority to PCT/CN2015/100141 priority patent/WO2016107600A1/fr
Publication of WO2016106755A1 publication Critical patent/WO2016106755A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method, device and system for supporting multimedia broadcast multicast service transmission.
  • a user can enjoy communication services based on an access function provided by a wireless access device and accessing a wireless network.
  • a wireless communication network Taking a mobile communication network as an example, after a user equipment (UE) establishes a connection with a base station (base station, BS for short), the network usually establishes a point-to-point unicast bearer for the user to provide user-level communication. Services such as voice calls, video on demand, file downloads, etc.
  • UE user equipment
  • base station base station
  • BS base station
  • Services such as voice calls, video on demand, file downloads, etc.
  • MBMS multimedia broadcast multicast service
  • FIG. 1 is a schematic diagram of deployment of a mobile communication network in the prior art, including one or more base stations.
  • Each base station manages one or more cells.
  • one base station manages one cell as an example.
  • the base station can The video content of the live sports broadcast is transmitted to a plurality of user equipments (UE 1, UE 2, UE 3) through a plurality of point-to-point unicast bearers.
  • the base station can also transmit the same video content to a plurality of user equipments (UE 1', UE 2', UE 3') through a single-point to multi-point multicast bearer. Due to the occupied network resources of the multicast bearer, it hardly changes as the number of user devices increases. Therefore, the service experience of the user can be effectively guaranteed, and the more the number of user devices, the higher the utilization of network resources.
  • the MBMS transmission includes a single cell transmission mode and a multimedia broadcast multicast service single frequency network (MBSFN) transmission mode.
  • MBSFN transmission refers to using the same radio resource configuration in multiple cells while transmitting the same data content.
  • cell 1, cell 2, and cell 3 can adopt the same radio resource configuration, and the same video content is simultaneously transmitted by the base station 1, the base station 2, and the base station 3.
  • the gain of the MBSFN transmission includes the combined gain of the receiver and the reduced inter-cell interference, thereby further improving the service experience of the user, especially the cell edge user.
  • MBMS is also referred to as evolved MBMS (evolved MBMS, abbreviated as eMBMS), and the present application does not distinguish between the two unless explicitly emphasized.
  • MBSFN area MBSFN synchronization area
  • MA MBSFN area
  • the base station in the MBSFN synchronization area can maintain time synchronization and perform MBSFN transmission. All cells on a single carrier of a base station can belong to only one MBSFN synchronization area.
  • the MBSFN transmission is in units of MA, and the MA is composed of some cells in the MBSFN synchronization area, and all cells belonging to the MA cooperate to complete MBSFN transmission.
  • cell 1, cell 2, and cell 3 in FIG. 1 may constitute one MA.
  • the synchronization area may include one or more MAs, and multiple MAs may overlap each other, and one cell may belong to multiple MAs at the same time.
  • one MBSFN synchronization area includes three MAs (MA 1, MA 2, MA 3).
  • MA 1 includes three cells
  • MA 2 includes seven cells
  • MA 3 includes two cells.
  • MA 1 and MA 2 partially overlap, and MA 2 and MA 3 are adjacent.
  • cell 2 and cell 3 belong to both MA 1 and MA 2.
  • MBMS transmission is usually implemented in the form of a hybrid carrier.
  • the cells participating in the MBMS transmission use the time division multiplexing method to configure the radio resources, and the same carrier can support both the MBMS transmission and the unicast transmission.
  • This type of cell is called an MBMS/Unicast-mixed cell.
  • the user equipment Before receiving the MBMS data, the user equipment needs to synchronize with the cell, and then acquire control information related to the MBMS data.
  • the synchronization signal is transmitted in units of cells, and the synchronization signal carries the cell identity (Cell ID or CI) of the cell. Different cells send different synchronization signals, and different synchronization signals carry different cell identifiers.
  • the user equipment synchronizes by detecting the synchronization channel of the cell, and determines a unique cell identity, thereby receiving broadcast information. That is, the synchronization channel and the broadcast channel are still in units of cells, and the multicast channel carrying MBMS data and control information is in units of MA.
  • MBMS transmission is also considered in the form of a dedicated carrier, and the cell can exclusively use one carrier for MBMS transmission, and the carrier can be called an MBMS dedicated carrier.
  • This type of cell is called an MBMS-dedicated cell.
  • the specific schemes for MBMS dedicated cells in the LTE standard have no results. For example, the synchronization process of the MBMS cell, the transmission process of the MBMS data and related control information, is still blank in the standard.
  • a synchronization scheme for an MBMS dedicated carrier is also discussed.
  • an MBMS dedicated carrier is added in the cell, and the MBMS dedicated carrier and the existing carrier of the cell are set to maintain downlink synchronization.
  • User equipment is the same as the cell After the step, synchronization with the MBMS dedicated carrier can be achieved.
  • this scheme has more restrictions in actual deployment, and requires the range of the dedicated carrier of the MBMS to be less than or equal to the coverage of the existing cell.
  • the scheme proposes to configure the synchronization channel and the broadcast channel in units of MA.
  • the same synchronization signal is transmitted in the same MA, and the synchronization signal carries the unique identifier of the MA, and different synchronization signals are transmitted between different MAs.
  • the coverage of this larger MA is accomplished by the combination of coverage of these smaller MAs.
  • This larger MA itself does not need to separately configure the synchronization channel or the broadcast channel. If the user equipment needs to access this larger MA, it can be implemented by detecting the broadcast channels and control channels of these smaller MAs.
  • the MA 2 is not composed of a plurality of other MAs, if the scheme is simply used, the synchronization channel is only configured in MA 1 and MA 3, and the coverage of the MA 2 may be vulnerable. In order to avoid this situation, it may be necessary to pre-plan the configuration of the MA, which will also impose certain restrictions in the actual deployment.
  • the embodiment of the present invention provides a method for supporting MBMS transmission, and a device And system to facilitate the actual deployment of MBMS transmission.
  • the embodiment of the present invention can be implemented by the following technical solutions:
  • a radio access device supporting MBMS transmission of a multimedia broadcast multicast service where the radio access device manages a first cell, where the first cell belongs to a first MBMS single frequency network area MA
  • Wireless access devices include:
  • a wireless interface a transmitter coupled to the wireless interface, and a processor coupled to the transmitter; wherein the processor is configured to control the wireless access device:
  • the second cell belongs to the second MA, and the first MA is different from the second MA.
  • the MBMS synchronization identifier is a second MA identifier, and the first cell belongs to the second MA;
  • the second MA includes more cells than the first MA; or, the second cell covers a larger geographic area than the first cell.
  • the MBMS synchronization identifier is a second MA identifier, and the first cell does not belong to the second MA.
  • the wireless access device is a base station, where The base station further includes a first receiver, where the processor is configured to control the wireless access device to obtain an MBMS synchronization identifier, including:
  • the processor is configured to communicate with the first receiver, so that: the base station receives a first configuration message sent by a core network device, where the first configuration message includes the MBMS synchronization flag knowledge.
  • the first configuration message is an MBMS scheduling information message, where
  • the second MA identifier is other than the first MA identifier that is already in the MBMS scheduling information message. , an added identifier for generating an MBMS synchronization signal;
  • the MBMS scheduling information message further includes: indicating, by the wireless access device, according to the The second MA identifies information for generating an MBMS synchronization signal.
  • the wireless access device For an MBMS broadcast device, the MBMS broadcast device is a broadcast device deployed for MBMS transmission, the MBMS broadcast device includes a first memory, and a code for indicating the MBMS synchronization identifier is stored in the first memory;
  • the processor is configured to control the wireless access device to obtain an MBMS synchronization identifier, including:
  • the processor is configured to read a code in the first memory for indicating the MBMS synchronization identifier.
  • the wireless access device include:
  • a second memory in the second memory, storing a code for indicating the pre-configured wireless resource
  • a second receiver configured to receive a second configuration message sent by the core network device, where the second configuration message is used to initialize or update the pre-configured wireless resource
  • the second memory is the same as or different from the first memory; when the wireless access device is a base station, the second receiver is The first receivers are the same or different.
  • the pre-configured radio resource is specified by a communication protocol, and a frame structure of the pre-configured radio resource is different from a frame structure of a radio resource used for unicast transmission.
  • a second aspect provides a core network device that supports MBMS transmission of a multimedia broadcast multicast service, where the core network device is respectively connected to a first wireless access device and a second wireless access device, where the first wireless access The device manages the first cell, and the second radio access device manages the second cell, where the first cell belongs to the first MBMS single frequency network area MA, the second cell belongs to the second MA, and the first MA The second MA is different, and the core network device includes:
  • the processor is configured to communicate with the transmitter and the wired interface to cause the core network device to:
  • the processor is configured to communicate with the transmitter and the wired interface, so that the core network device:
  • the first cell belongs to the second MA, and the number of cells included by the second MA is greater than or equal to the first MA; or, the first cell belongs to the second a MA, and the geographical area covered by the second cell is greater than or equal to the first cell;
  • the second MA is a primary MA
  • the identifier of the primary MA is used as the MBMS synchronization identifier.
  • the MBMS synchronization identifier is a second MA identifier; and, the first cell does not belong to the second MA.
  • the core network device is a multicast coordination entity
  • the first MBMS synchronization identifier is sent by using an MBMS scheduling information message, where the second MA identifier is an existing one of the MBMS scheduling information messages when the first cell does not belong to the second MA.
  • An identifier for generating an MBMS synchronization signal, in addition to an MA identifier, where the first cell belongs to the second MA, the MBMS scheduling information message further includes: The ingress device generates information of the MBMS synchronization signal according to the second MA identifier.
  • the processor is configured to communicate with the transmitter and the wired interface to cause the core network device to: send indication information to the first wireless access device and the second wireless access device, to enable the The first wireless access device and the second wireless access device configure the same wireless resource for the MBMS synchronization signal.
  • a communication system comprising: the wireless access device as provided in any of the first aspect and various possible implementations, and the second aspect and various possible implementations above The core network device provided by either.
  • a communication system supporting MBMS transmission of a multimedia broadcast multicast service, the communication system comprising a first wireless access device and a second wireless access device, the first wireless connection
  • the ingress device manages the first cell
  • the second radio access device manages the second cell, where the first cell belongs to the first MBMS single frequency network area MA, the second cell belongs to the second MA, and the first MA Different from the second MA
  • the first radio access device is configured to: acquire a first MBMS synchronization identifier; generate a first MBMS synchronization signal according to the first MBMS synchronization identifier; and based on the pre-configured first radio resource, a broadcast station Decoding a first MBMS synchronization signal
  • the second radio access device is configured to: acquire a second MBMS synchronization identifier; generate a second MBMS synchronization signal according to the second MBMS synchronization identifier; and broadcast the radio resource according to the pre-configured second radio resource a
  • the first MBMS synchronization identifier and the second MBMS synchronization identifier are the same MBMS synchronization identifier, and the pre-configured first radio resource and the pre-configured second radio resource are the same radio resource.
  • the communications system further includes:
  • a core network device that is connected to the first wireless access device and the second wireless access device, respectively, configured to: send the first MBMS synchronization identifier to the first wireless access device;
  • the second wireless access device sends the second MBMS synchronization identifier.
  • the MBMS synchronization identifier is a second MA identifier, and the first cell does not belong to the first Two MA.
  • the core network device is configured to:
  • the second MA is a primary MA
  • the identifier of the primary MA is used as the MBMS synchronization identifier.
  • the core network device is a multicast coordinated Entity
  • the first MBMS synchronization identifier is sent by using an MBMS scheduling information message
  • the second MA identifier is used to generate an MBMS synchronization signal, except for the first MA identifier that is already in the MBMS scheduling information message.
  • the MBMS scheduling information message further includes: information used to instruct the wireless access device to generate an MBMS synchronization signal according to the second MA identifier.
  • the core network device is used to:
  • a method for supporting Multimedia Broadcast Multicast Service (MBMS) transmission including:
  • the wireless access device acquires an MBMS synchronization identifier, and the wireless access device manages the first cell,
  • the first cell belongs to the first MBMS single frequency network area MA;
  • the wireless access device broadcasts the MBMS synchronization signal based on a pre-configured wireless resource
  • the MBMS synchronization identifier, the pre-configured radio resource is also applicable to the second cell, the second cell belongs to the second MA, and the first MA is different from the second MA.
  • the MBMS synchronization identifier is a second MA identifier, and the first cell belongs to the second MA;
  • the second MA includes more cells than the first MA; or, the second cell covers a larger geographic area than the first cell.
  • the MBMS synchronization identifier is a second MA identifier, and the first cell does not belong to the second MA.
  • the wireless access device is a base station, The wireless access device obtains the MBMS synchronization identifier, including:
  • the base station receives a first configuration message sent by the core network device, where the first configuration message includes the MBMS synchronization identifier.
  • the first configuration message is an MBMS scheduling information message
  • the second MA identifier is other than the first MA identifier that is already in the MBMS scheduling information message. , an added identifier for generating an MBMS synchronization signal;
  • the MBMS scheduling information message further includes: information used to instruct the wireless access device to generate an MBMS synchronization signal according to the second MA identifier.
  • the wireless access device is an MBMS broadcast device
  • the MBMS broadcast device is a broadcast device for deploying an MBMS
  • the MBMS broadcast device stores a code for indicating the MBMS synchronization identifier
  • the MBMS broadcast device reads an internally stored code indicating the MBMS synchronization identity.
  • the method further includes: The MBMS broadcast device reads an internally stored code for indicating the pre-configured wireless resource; and/or receives a second configuration message sent by the core network device, the second configuration message being used to initialize or update the pre- Configured wireless resources.
  • the sixth aspect further provides a method for supporting MBMS transmission of a multimedia broadcast multicast service, where the method is applicable to a core network device, where the core network device is respectively connected to a first wireless access device and a second wireless access device.
  • the first radio access device manages a first cell
  • the second radio access device manages a second cell, where the first cell belongs to a first MBMS single frequency network area MA, and the second cell belongs to a second MA:
  • the first MA is different from the second MA
  • the method includes: sending a first MBMS synchronization identifier to the first wireless access device; and sending a second MBMS synchronization to the second wireless access device
  • the first MBMS synchronization identifier and the second MBMS synchronization identifier are the same MBMS synchronization identifier, and the MBMS synchronization identifier is used to generate an MBMS synchronization signal.
  • the method further includes: the core network device belongs to the second MA in the first cell, and the second MA When the number of the included cells is greater than or equal to the first MA; or, the first cell belongs to the second MA, and the geographical area covered by the second cell is greater than or equal to the first cell Determining that the second MA is the primary MA, and the identifier of the primary MA is used as the MBMS synchronization identifier.
  • the MBMS synchronization identifier is a second MA identifier; and the first cell does not belong to the second MA.
  • the core network device is a multicast coordination entity
  • the first MBMS synchronization identifier is sent by using an MBMS scheduling information message, where the second MA identifier is an existing one of the MBMS scheduling information messages when the first cell does not belong to the second MA.
  • An identifier for generating an MBMS synchronization signal, in addition to an MA identifier, where the first cell belongs to the second MA, the MBMS scheduling information message further includes: The ingress device generates information of the MBMS synchronization signal according to the second MA identifier.
  • the core network device sends indication information to the first wireless access device and the second wireless access device, so that the first wireless access device and the second wireless access device are synchronized by the MBMS
  • the signal is configured with the same radio resources.
  • a user supporting MBMS transmission of a multimedia broadcast multicast service is also provided The device, wherein the user equipment includes:
  • the processor is configured to communicate with the memory and the receiver to cause the user equipment to:
  • Searching for the MBMS synchronization signal based on the MBMS synchronization channel parsing the MBMS synchronization signal to obtain an MBMS synchronization identifier carried by the MBMS synchronization signal, where the MBMS synchronization identifier is an identifier of an MBMS single frequency network area MA .
  • the MBMS synchronization signal has the same structure as the synchronization signal supporting unicast transmission, but has different values;
  • the frame structure of the radio resource occupied by the MBMS synchronization signal is different from the frame structure of the radio resource occupied by the synchronization signal supporting the unicast transmission.
  • a computer readable storage medium is stored, the computer readable storage medium storing computer program code, when executed by a processor or a processing unit, enabling the wireless access device to perform the above.
  • the method provided by the fifth aspect and any one of the possible implementation manners, or the method provided by any one of the sixth aspect and various possible implementation manners may also provide hardware-based The implementation of a module or software module or a combination of hardware and software. For example, replacing the transmitter therein with a transmitting module or a transmitting unit, replacing the receiver with a receiving module or a receiving unit, replacing the processor with a processing module or a processing unit, and replacing the memory with Storage module or storage unit.
  • the technical solution provided by the implementation of the present invention is more convenient in actual deployment than the existing MBSFN transmission, and can realize multi-MA cooperative transmission of the same MBMS synchronization signal, which can improve the coverage of the synchronization signal.
  • the scope also saves transmission resources.
  • the MBMS identifier is the second MA identifier
  • the second MA identifier is not required to be transmitted in the system message for the cell in the second MA, which may further save resource overhead.
  • the pre-configured radio resource is initialized or updated by configuring the message delivery MBMS synchronization identifier, which is more flexible and convenient, but needs to occupy certain network resources.
  • the MBMS synchronization identifier and the radio resource are pre-configured by the protocol, or the built-in memory pre-configures the MBMS synchronization identifier and the radio resource, but a certain network resource can be saved, but if the configuration needs to be changed, it is relatively cumbersome.
  • FIG. 1 is a schematic diagram of deployment of a mobile communication network in the prior art
  • FIG. 2 is a schematic diagram of an MBMS application in the prior art
  • FIG. 3 is a schematic diagram of a network architecture supporting MBMS transmission applicable to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a communication system supporting MBMS transmission according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a wireless access device supporting MBMS transmission according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a core network device supporting MBMS transmission according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of a method for supporting MBMS transmission according to an embodiment of the present invention.
  • the user equipment may be referred to as a terminal, a mobile station (Mobile Station, MS: Mobile Terminal), or the like.
  • the user equipment can communicate with one or more core networks (CNs) via a radio access network (RAN).
  • CNs core networks
  • the user equipment may be a mobile phone (or "cellular" phone), a portable computer, a tablet computer, etc., and may also be an Internet of Things device such as a vehicle communication module or the like.
  • a radio access network is composed of a radio access device, and the radio access device generally refers to a base station, and may also refer to other access network devices for providing radio access services.
  • a base station may be referred to as a Node B (Node B, abbreviated as: NodeB or NB).
  • NodeB abbreviated as: NodeB or NB
  • a base station may be referred to as an evolved Node B (abbreviated as: eNodeB or eNB).
  • the core network is composed of multiple core network devices, which are responsible for the overall control of the user equipment and the establishment of related bearers.
  • a core network device includes: a mobility management entity (MME), a public data network gateway (PDN GW or P-GW), and the like.
  • service gateway serving gateway, referred to as: S-GW).
  • FIG. 3 is a schematic diagram of a network architecture supporting MBMS transmission applicable to an embodiment of the present invention.
  • the network architecture 300 includes user equipment (301, 302), access network equipment (311, 312, 313), and core network equipment (320, 330, 340).
  • user equipment 301, 302
  • access network equipment 311, 312, 313
  • core network equipment 320, 330, 340
  • the foregoing device is listed in FIG. 3 for illustrative purposes only. In actual deployment, it is not limited to the form of FIG. 3, and the types and numbers of the foregoing devices may be adaptively increased or decreased, for example, adding other necessary cores. Internet equipment.
  • the present application will introduce various embodiments of the present invention by taking an LTE system as an example.
  • the core network device 320 is an MME
  • the core network device 330 is a multi-cell/multicast coordination entity (MCE)
  • the core network device 340 is an MBMS gateway (abbreviation: MBMS-GW).
  • MCE multi-cell/multicast coordination entity
  • MBMS-GW MBMS gateway
  • the MCE is a logical entity. In actual deployment, the MCE can exist as a standalone device or be deployed in combination with other devices, for example, integrated into a base station or other core network devices.
  • the functions of the MCE mainly include: receiving and transmitting MBMS session control signalling to the eNB, supporting session management functions (such as session initiation, session stop, etc.), and scheduling eNB management.
  • the radio resources of the cell ensure the consistency of the radio resource configuration of each cell in a single MA.
  • the MBMS-GW supports forwarding MBMS service data to the eNB, and the MBMS-GW can be deployed together with the P-GW.
  • the interface between the MBMS-GW and the eNB is called an M1 interface, and is a user plane interface.
  • the MBMS-GW sends MBMS service data to the eNB by means of IP multicast.
  • the interface between the MCE and the eNB is called the M2 interface, and is the control plane interface.
  • the M2 interface signaling is transmitted based on the stream control transmission protocol (SCTP), and the M2 interface protocol is followed.
  • SCTP stream control transmission protocol
  • the interface between the MCE and the MME is called the M3 interface, which is the control plane interface.
  • the MTP interface signaling is based on the SCTP and follows the M3 interface protocol.
  • the embodiment of the present invention may consider configuring a synchronization channel for the MA2 to ensure coverage of the MA2. For the cells managed by the base station 312, since they belong to MA1 and MA2 at the same time, two sets of synchronization channels need to be separately configured.
  • the two sets of synchronization channels may be sent by the base station 312, but this may cause a certain waste of resources.
  • For the UE at the edge of the MA it may be more interfered by the neighboring MA.
  • the scheme will be more complicated and may not be the best solution.
  • FIG. 4 is a schematic diagram of a communication system supporting MBMS transmission according to an embodiment of the present invention.
  • the communication system 400 includes a first wireless access device and a second wireless access device.
  • the first radio access device manages the first cell
  • the second radio access device manages the second cell
  • the first cell belongs to the first MBMS single frequency network area MA
  • the second cell belongs to the second MA, the first MA Different from the second MA.
  • the first radio access device is configured to: acquire a first MBMS synchronization identifier; generate a first MBMS synchronization signal according to the first MBMS synchronization identifier; and broadcast the first according to the pre-configured first radio resource.
  • MBMS sync signal is configured to: acquire a first MBMS synchronization identifier; generate a first MBMS synchronization signal according to the first MBMS synchronization identifier; and broadcast the first according to the pre-configured first radio resource.
  • the second radio access device is configured to: acquire a second MBMS synchronization identifier; generate a second MBMS synchronization signal according to the second MBMS synchronization identifier; and broadcast the second MBMS synchronization signal based on the pre-configured second radio resource .
  • first MBMS synchronization identifier and the second MBMS synchronization identifier are the same MBMS synchronization identifier, and the pre-configured first radio resource and the pre-configured second radio resource are the same radio resource.
  • the communication system 400 further includes: a core network device connected to the first wireless access device and the second wireless access device, respectively, configured to: go to the first wireless access device Sending the first MBMS synchronization identifier; and sending the second MBMS synchronization identifier to the second radio access device.
  • a core network device connected to the first wireless access device and the second wireless access device, respectively, configured to: go to the first wireless access device Sending the first MBMS synchronization identifier; and sending the second MBMS synchronization identifier to the second radio access device.
  • the first radio access device and the second radio access device broadcast the same MBMS synchronization signal on the same radio resource.
  • the MBMS synchronization signals transmitted in different cells belonging to different MAs are equivalent to the synchronization signals from the same cell, and can obtain the reception combining gain and the interference generated by different synchronization signals transmitted between different MAs. . Therefore, compared with the existing MBSFN transmission, the technical solution in the embodiment of the present invention is more convenient in actual deployment, and the multi-MA cooperative transmission of the same MBMS synchronization signal can be realized, which can improve the coverage of the synchronization signal and save the same. Transfer resources.
  • FIG. 5 is a schematic diagram of a wireless access device supporting MBMS transmission according to an embodiment of the present invention.
  • the wireless access device 500 can be the first wireless access device or the second wireless access device in the communication system 400 shown in FIG.
  • the wireless access device 500 manages a first cell, and the first cell belongs to a first MA.
  • the wireless access device 500 includes a communication interface 510, a transmitter 520, and a processor 530.
  • the communication interface 510 can include: a wireless interface and a wired interface.
  • the wireless interface may refer to an antenna or a logical or physical interface that connects the antennas.
  • the wireless access device 500 may further include a receiver 540, a memory 550, and the like.
  • Memory 550 can include read only memory and random access memory and provides instructions and data to processor 530.
  • the processor 530 controls the operation of the wireless access device 500.
  • the processor 530 may also be referred to as a central processing unit (CPU).
  • transmitter 520 and receiver 540 can be coupled to communication interface 510.
  • bus system 50 which may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like. However, for clarity of description, various buses are labeled as bus system 50 in the figure.
  • the wireless access device 500 may include:
  • the processor 530 is configured to control the wireless access device 500: acquire an MBMS synchronization identifier; generate an MBMS synchronization signal according to the MBMS synchronization identifier; and broadcast the MBMS synchronization signal based on a pre-configured wireless resource.
  • the MBMS synchronization identifier, the pre-configured radio resource is also applicable to the second cell, the second cell belongs to the second MA, and the first MA is different from the second MA.
  • the second cell may be managed by other wireless access devices than the wireless access device 500.
  • the second cell may also be managed by the wireless access device 500 when compatibility with the current LTE protocol is not considered.
  • the MBMS synchronization identifier may be a synchronization identifier designed separately to support MBMS transmission. There may be more than one MBMS synchronization identifier, and each synchronization identifier uniquely indicates one MBMS synchronization signal.
  • the number of MBMS synchronization signals, the sequence type, the sequence length and the sequence value, and the correspondence between the MBMS synchronization identifier and the MBMS synchronization signal can be agreed by the communication protocol.
  • the wireless access device After receiving the MBMS synchronization identifier, the wireless access device can generate an MBMS synchronization signal according to the MBMS synchronization identifier.
  • the pre-configured radio resources may also be contracted by the communication protocol.
  • the user equipment supporting the communication protocol can search for the broadcast MBMS synchronization signal on the pre-configured radio resource. For example, the user equipment may base time domain correlation with the received signal using the MBMS synchronization signal pre-agreed by the communication protocol based on the sequence correlation detection method. When the peak of the domain correlation exceeds a certain threshold, it can be determined that the MBMS synchronization signal is received, and the downlink timing and the MBMS synchronization identifier are obtained accordingly.
  • the MBMS synchronization identifier is a second MA identifier, and after receiving the MBMS synchronization signal, the user equipment may obtain the second MA identifier.
  • the MA indicated by the second MA identifier is the second MA.
  • different MAs have different identifiers, which are called MBSFN area identity.
  • the MA identifier cannot be provided to the user equipment through the synchronization signal, but is carried in the system information. The user equipment needs to synchronize first, then receive the system message, and then obtain the MA identifier.
  • the MA identifier is used to scramble MBMS service data in different MAs, and the user equipment can perform a descrambling operation based on the MA identifier to obtain MBMS service data. Therefore, when the MBMS synchronization identifier is the second MA identifier, for the cell in the second MA, such as the second cell, the second MA identifier is not required to be transmitted in the system message, which can save resource overhead. For the first cell, the attribution relationship between the first cell and the second MA needs to be considered.
  • the first cell does not belong to the second MA.
  • the first cell belongs to the first MA, and the first MA identifier can be obtained.
  • the first cell still needs to generate and transmit an MBMS synchronization signal according to the second MA identifier, where the MBMS synchronization signal carries the second MA identifier.
  • the same MBMS synchronization signal is transmitted between different MAs, for the user equipment, interference generated by transmitting different synchronization signals between different MAs is avoided, especially when the first cell and the second cell (or the first MA) When adjacent to the second MA), the gain is still objective.
  • the first cell may also belong to the second MA, that is, the first cell belongs to both the first MA and the second MA.
  • This scenario has been considered in the embodiment shown in FIG. 3.
  • two sets of synchronization channels need not be configured in the first cell.
  • both the first MA identity and the second MA identity can be used to generate an MBMS synchronization signal.
  • the first cell belongs to the second MA, and the number of cells included in the second MA is greater than or equal to the first MA; or, the first cell belongs to the same a second MA, where the geographical area covered by the second cell is greater than or equal to the first cell; and the second MA identifier is specified to generate an MBMS synchronization message. No. can better improve coverage and save resources. This is different from the idea of the solution mentioned in the background art, and to some extent it can be considered to be the opposite. In that solution, for the MA overlap scenario, it is recommended to use multiple smaller MA coverages to complete the coverage of the larger MA.
  • the wireless access device 500 further includes: a receiver 540; the processor 530 is configured to control the wireless access device 500 to acquire an MBMS synchronization identifier, including: The processor 530 is configured to communicate with the receiver 540, so that: the wireless access device 500 receives a configuration message sent by a core network device, where the configuration message includes the MBMS synchronization identifier.
  • the wireless access device 500 further includes a memory 550, where the code for indicating the MBMS synchronization identifier is stored in the memory 550;
  • the controlling the wireless access device 500 to acquire the MBMS synchronization identifier includes: the processor 530 is configured to read a code in the memory 550 for indicating the MBMS synchronization identifier.
  • the foregoing wireless access device 500 may further include:
  • a memory 560 in which is stored a code for indicating the pre-configured wireless resource;
  • the receiver 570 is configured to receive a second configuration message sent by the core network device, where the second configuration message is used to initialize or update the pre-configured wireless resource.
  • the memory 560 and the memory 550 may be the same or different memories; the receiver 570 and the receiver 540 may be the same or different receivers. For the sake of brevity, the memory 560 and the receiver 570 are not separately shown in FIG.
  • the wireless access device 500 may be a base station or an MBMS broadcast device, and the MBMS broadcast device is a broadcast device deployed for MBMS transmission.
  • the MBMS broadcast device can be understood as a broadcast device dedicated to MBMS transmission, which is deployed separately. It should be understood that dedicated to MBMS transmission is not limited to the MBMS broadcast device being used only for MBMS transmission, and the MBMS broadcast device may obviously have other functions, but supporting MBMS transmission is its main function.
  • the base station is also used to support unicast transmission and supports unicast transmission, which may be more important for the base station.
  • the wireless access device 500 is a base station and an MBMS broadcast device.
  • the wireless access device 500 is an MBMS broadcast device
  • the MBMS broadcast device is a broadcast device that is separately deployed and dedicated to MBMS transmission
  • the memory 550 or 560 can be relatively easily built in the device factory, initial installation, or device debugging.
  • the memory 550 or 560 in the broadcast device transmitted to the MBMS through the external interface copies a code indicating the MBMS synchronization identifier.
  • the pre-configured radio resource is initialized or updated by configuring the message delivery MBMS synchronization identifier, which is more flexible and convenient, but needs to occupy a certain network resource.
  • pre-agreed by protocol, or built-in memory pre-configured MBMS synchronization identifier and radio resources can save certain network resources, but it is relatively cumbersome if the configuration needs to be changed.
  • the MBMS broadcast device is particularly suitable for mobile TV scenarios based on MBMS technology.
  • Existing broadcast TV operators or mobile communication operators use the existing TV spectrum as an MBMS dedicated carrier and separately deploy MBMS broadcast equipment, which is dedicated to MBMS transmission, in order to provide users with high-speed data services such as mobile TV services.
  • These MBMS broadcast devices can be configured or integrated with capability units that support MBMS transmission, preferably with high power radio units and antennas. Therefore, the coverage of an MBMS broadcast device can be much larger than the coverage that one base station can provide in current LTE systems. This way, covering a city
  • the number of MBMS broadcast devices required is much less than the number of base stations used.
  • the MBMS broadcast device can also be mixed with the base station.
  • the MBMS broadcast device is responsible for the primary coverage, and the MBMS broadcast device covers the edge of the area, and then the base station is configured to implement coverage.
  • the base station is configured to implement coverage.
  • base stations can also be configured for coverage and capacity enhancement.
  • the first wireless access device is a base station
  • the second wireless access device is an MBMS broadcast device.
  • the concept of a cell in an existing cellular communication system may change in consideration of the use of an MBMS dedicated carrier scenario.
  • the concept of a cell in the present application can be further extended to be applicable to an MBMS broadcast device.
  • a cell is a basic component of a radio access network, and is a minimum service unit that provides access services for user equipment.
  • Each cell has an identity, which may also be referred to as Cell Identity.
  • the cell identity is broadcast by a access device of the radio access network, such as a base station, within a certain geographic area.
  • the user equipment in the geographic area can uniquely identify the cell based on the cell identity, and access the cell to enjoy wireless communication services.
  • a cell involves two layers of meanings, one is a coverage area of a cell, and is related to a geographical area of a broadcast cell identifier; and the other is a resource combination of a cell, which is related to a frequency resource that provides a wireless communication service.
  • the coverage area is related to, but not identical to, the geographic area of the broadcast cell identity, and is usually defined as the geographic area required to achieve a certain service.
  • the resource combination of a cell is related to a carrier but not identical.
  • a carrier is typically defined as a modulated waveform that carries data or control signaling for a wireless communication service.
  • a cell may have multiple carriers, and one carrier may also be shared by multiple cells.
  • the radio access device since the radio access device no longer broadcasts the cell identity, only the MBMS synchronization identity, such as the second MA identity, is broadcast. If the concept of the cell is cancelled for the MBMS dedicated carrier in the future, the cell in the present application can also be understood as indicating the geographical area that can be covered by the MBMS dedicated carrier broadcast signal for the wireless access device.
  • MBSFN transmission specifically for MBMS For services, MBSFN transmission can still be performed in units of MA. Cells in different MAs use different MA identifiers to scramble MBMS service data.
  • multi-MA cooperative transmission can be used to further ensure coverage and reduce resource overhead.
  • the MA identifier is similar to the original cell identifier concept, but the difference is that the MA identifier obtained by the user equipment resolution is not necessarily the MA identifier used to scramble the MBMS service data.
  • the user equipment can also obtain other MA identifiers through additional system messages or MBMS control information.
  • FIG. 6 is a schematic diagram of a core network device supporting MBMS transmission according to an embodiment of the present invention.
  • the core network device 600 may be a core network device of the communication system 400 introduced in the embodiment shown in FIG.
  • the core network device 600 can be respectively connected to the first wireless access device and the second wireless access device, wherein the first wireless access device manages a first cell, and the second wireless access device manages a second cell
  • the first cell belongs to the first MA
  • the second cell belongs to the second MA
  • the first MA is different from the second MA.
  • the core network device 600 can cooperate with the wireless access device in the embodiment shown in FIG. 5 and the optional implementation manners to support MBMS transmission.
  • Related term definitions, implementation manners, and technical effects can be referred to these embodiments. And an introduction to each of the alternative embodiments.
  • the core network device 600 includes a communication interface 610, a transmitter 620, and a processor 630.
  • the communication interface 510 is generally a wired interface, and the number of the interfaces may be one or more for connecting to the wireless access device and other core network devices.
  • core network device 600 may also include a receiver 640, a memory 650, and the like.
  • Memory 650 can include read only memory and random access memory and provides instructions and data to processor 630.
  • the processor 630 controls the operation of the core network device 600, and may also be referred to as a central processing unit (CPU).
  • CPU central processing unit
  • the various components of core network device 600 are coupled together by bus system 50.
  • the core network device 600 includes: a wired interface 610, a transmitter 620, and a processor 630; wherein the processor is configured to communicate with the transmitter and the wired interface, so that The core network device 600:
  • the first MBMS synchronization identifier and the second MBMS synchronization identifier are the same MBMS synchronization identifier, and the MBMS synchronization identifier is used to generate an MBMS synchronization signal.
  • the processor 630 is configured to communicate with the transmitter 620 and the wired interface 610, so that the core network device 600:
  • the first cell belongs to the second MA, and the number of cells included by the second MA is greater than or equal to the first MA; or, the first cell belongs to the second a MA, and the geographical area covered by the second cell is greater than or equal to the first cell;
  • the second MA is a primary MA
  • the identifier of the primary MA is used as the MBMS synchronization identifier.
  • the first MBMS synchronization identifier is sent by using an MBMS scheduling information message
  • the second MA identifier is an identifier that is used to generate an MBMS synchronization signal, except for the first MA identifier that is already in the MBMS scheduling information message. ;
  • the MBMS scheduling information message further includes: information used to instruct the wireless access device to generate an MBMS synchronization signal according to the second MA identifier.
  • the processor 630 is configured to communicate with the transmitter 620 and the wired interface 610, so that the core network device 600:
  • the foregoing embodiments and optional implementations involve signaling interaction between a core network device and a wireless access device, for example, the core network device sends a configuration message to the wireless access device core network device to the wireless access device. Transmitting an MBMS synchronization identifier, such as a second MA identity, or initializing or updating a pre-configured wireless resource for transmitting an MBMS synchronization signal; or, the core network device sends indication information to multiple wireless access devices to enable The wireless access devices configure the same radio resources for the MBMS synchronization signals; both can redesign new messages for bearer, and can be combined into one message or divided into several message bearers.
  • an MBMS synchronization identifier such as a second MA identity, or initializing or updating a pre-configured wireless resource for transmitting an MBMS synchronization signal
  • the core network device sends indication information to multiple wireless access devices to enable
  • the wireless access devices configure the same radio resources for the MBMS synchronization signals; both can redesign new messages for bearer, and can
  • the existing M2 interface such as an MBMS session start request message or MBMS scheduling information.
  • a new field or a modified original field may be added to carry the newly introduced information.
  • the existing MAMS scheduling information message only carries the first MA identifier, and does not carry the second MA identifier. Therefore, for the MBMS scheduling information message, the second MA identifier here is the newly added identifier for generating the MBMS synchronization signal.
  • the existing MAMS scheduling information message carries the first MA identifier and the second MA identifier. Therefore, the wireless access device needs to be additionally instructed to generate an MBMS synchronization signal according to the second MA identifier, for example, after modifying the field name, or directly adding the indication information.
  • FIG. 7 is a schematic diagram of a method for supporting MBMS transmission according to an embodiment of the present invention.
  • the method includes:
  • Step S701 The MCE sends a configuration message 1 to the eNB 1, where the configuration message 1 carries the first MBMS synchronization identifier.
  • Step S703 The MCE sends a configuration message 2 to the eNB 2, where the configuration message 2 carries the second MBMS synchronization identifier.
  • the first MBMS synchronization identifier and the second MBMS synchronization identifier are the same MBMS synchronization identifier, and the MBMS synchronization identifier is used to generate an MBMS synchronization signal.
  • the MBMS synchronization identifier may be a second MA identifier.
  • both the configuration message 1 and the configuration message 2 may be an MBMS scheduling information message.
  • the eNB may also be replaced with an MBMS broadcast device.
  • At least one of the foregoing steps S701 or S702 may be replaced by: the eNB or the MBMS broadcast device reads the internally stored MBMS synchronization identifier.
  • Step S705 The MCE sends a configuration message 3 to the eNB 1, where the configuration message 3 carries information for instructing the eNB 1 to schedule radio resources for the MBMS synchronization signal.
  • Step S707 The MCE sends a configuration message 4 to the eNB 2, where the configuration message 4 carries information for instructing the eNB 2 to schedule radio resources for the MBMS synchronization signal.
  • the configuration message 3 and the configuration message 4 are used to make the radio resources scheduled by the eNB 1 and the eNB 2 for the MBMS synchronization signal to be the same radio resource. If the radio resources for transmitting the MBMS synchronization signal are pre-configured in the eNB 1 and the eNB 2, for example, have been previously agreed by the communication protocol, step S705 and step S707 may also be omitted. Alternatively, step S705 and step S707 herein may also be used to initialize or update the pre-configured radio resources. It should be noted that the execution order is not limited between the above steps S701, S703, S705, and S705.
  • step Steps S701 and S705 can be combined into one step, that is, configuration message 1 and configuration message 3 are the same message.
  • Steps S703 and S707 can also be combined into one step, that is, configuration message 2 and configuration message 4 are the same message.
  • Step S709 the eNB 1 generates and broadcasts an MBMS synchronization signal according to the MBMS synchronization identifier.
  • Step S709' the eNB 2 generates and broadcasts an MBMS synchronization signal according to the MBMS synchronization identifier.
  • eNB 1 and eNB 2 broadcast the same MBMS synchronization signal on the same radio resource. Therefore, the multi-MA cooperative transmission of the same MBMS synchronization signal can be realized, which can improve the coverage of the synchronization signal, and can also save transmission resources.
  • a general purpose processor may be a microprocessor.
  • the general purpose processor may be any conventional processor, controller, microcontroller, or state machine.
  • the processor can also be implemented by a combination of computing devices, such as a digital signal processor It is implemented with a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.
  • the steps of the method or algorithm described in the embodiments of the present invention may be directly embedded in hardware, a software module executed by a processor, or a combination of the two.
  • the software modules can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art.
  • the storage medium can be coupled to the processor such that the processor can read information from the storage medium and can write information to the storage medium.
  • the storage medium can also be integrated into the processor.
  • the processor and the storage medium may be disposed in an ASIC, and the ASIC may be disposed in the user terminal. Alternatively, the processor and the storage medium may also be disposed in different components in the user terminal.
  • the above-described functions described in the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, these functions may be stored on a computer readable medium or transmitted as one or more instructions or code to a computer readable medium.
  • Computer readable media includes computer storage media and communication media that facilitates the transfer of computer programs from one place to another.
  • the storage medium can be any available media that any general purpose or special computer can access.
  • Such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other device or data structure that can be used for carrying or storing Other media that can be read by a general purpose or special computer, or a general purpose or special processor.
  • any connection can be appropriately defined as a computer readable medium, for example, if the software is from a website site, server or other remote source through a coaxial cable, fiber optic computer, twisted pair, digital subscriber line (DSL) Or wirelessly transmitted in, for example, infrared, wireless, and microwave, is also included in the defined computer readable medium.
  • DSL digital subscriber line
  • the disks and discs include compact disks, laser disks, optical disks, DVDs, floppy disks, and Blu-ray disks. Disks typically replicate data magnetically, while disks typically optically replicate data with a laser. Combinations of the above may also be included in a computer readable medium.

Abstract

L'invention concerne un procédé, un dispositif et un système de prise en charge de transmission de service diffusion MBMS. Le système de communication comprend : un premier dispositif d'accès sans fil et un second dispositif d'accès sans fil, le premier dispositif d'accès sans fil gérant une première cellule, et le second dispositif d'accès sans fil gérant une seconde cellule, la première cellule appartenant à une première zone de réseau à fréquence unique MBMS (MA), et la seconde cellule appartenant à une seconde MA; et le premier dispositif d'accès sans fil et le second dispositif d'accès sans fil acquièrent le même identifiant de synchronisation MBMS, génèrent le même signal de synchronisation MBMS et diffusent le signal de synchronisation MBMS sur la même ressource radio. A l'aide de la solution technique des modes de réalisation de la présente invention, il est plus adapté dans un déploiement réel que de multiples MA transmettent en coopération le même signal de synchronisation MBMS, ce qui permet non seulement d'élargir la plage de couverture du signal de synchronisation, mais également d'économiser de ressources de transmission.
PCT/CN2014/096067 2014-12-31 2014-12-31 Procédé, dispositif et système de prise en charge de transmission de service de diffusion mbms WO2016106755A1 (fr)

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CN201480084497.8A CN107113575B (zh) 2014-12-31 2014-12-31 支持多媒体广播多播业务传输的方法，设备及系统
PCT/CN2014/096067 WO2016106755A1 (fr) 2014-12-31 2014-12-31 Procédé, dispositif et système de prise en charge de transmission de service de diffusion mbms
CN201580072128.1A CN107113781B (zh) 2014-12-31 2015-12-31 支持多媒体广播多播业务传输的方法，设备及系统
PCT/CN2015/100141 WO2016107600A1 (fr) 2014-12-31 2015-12-31 Procédé, dispositif et système prenant en charge une transmission de service de diffusion/multidiffusion multimédia

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