WO2011147268A1 - Procédé et dispositif pour l'émission d'un service de diffusion dans un système d'évolution à long terme - Google Patents

Procédé et dispositif pour l'émission d'un service de diffusion dans un système d'évolution à long terme Download PDF

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Publication number
WO2011147268A1
WO2011147268A1 PCT/CN2011/074129 CN2011074129W WO2011147268A1 WO 2011147268 A1 WO2011147268 A1 WO 2011147268A1 CN 2011074129 W CN2011074129 W CN 2011074129W WO 2011147268 A1 WO2011147268 A1 WO 2011147268A1
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Prior art keywords
mbms service
cell
service
mbms
enb
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PCT/CN2011/074129
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English (en)
Chinese (zh)
Inventor
毛磊
翟恒星
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刘建
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Publication of WO2011147268A1 publication Critical patent/WO2011147268A1/fr

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

Definitions

  • the present invention relates to the field of wireless communications, and more particularly to a method and apparatus for transmitting broadcast services in an LTE (Long Term Evolution) system. Background technique
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • 3.9G improved 3G
  • 3GPP proposes MBMS (Multimedia Broadcast Multicast Service), which is a technology for transmitting data from one data source to multiple targets, and implements the network (including the core network).
  • MBMS Multimedia Broadcast Multicast Service
  • the sharing of resources with the access network improves the utilization of network resources (especially air interface resources).
  • MBMS defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service broadcast and multicast, providing a variety of rich video, audio and multimedia services, which undoubtedly conforms to future mobile
  • the trend of data development provides a better business prospect for the development of 3G.
  • the MBMS system designed in 3GPP release9 uses the Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) to transmit MBMS services.
  • MBSFN transmission mode is to synchronously transmit the same signal (MBMS control signaling and service data) on the same physical resource of multiple intra-frequency cells, so that the UE receiving the MBMS service receives the enhanced signal after multiple cells are superimposed, Improve the signal reception quality of the UE.
  • the MBSFN transmission mode requires synchronization of all cells in the MBMS service transmission area
  • the signal is transmitted, so it is inevitable to design an entity to coordinate resource allocation and control data transmission of multiple eNBs (Evolved NodeB, Base Station/Evolved Base Station).
  • FIG. 1 shows the architecture of the MBMS system designed in 3GPP Release 9.
  • the MCE and E-MBMS gateways are new NEs for MBMS services, and the corresponding interfaces M1/M2/M3 interfaces, other interfaces and Entities are existing entities of LTE.
  • MCE Multi-cell/multicast Coordination Entity
  • MCE is a logical entity. This does not exclude the possibility that the entity belongs to other network elements.
  • the function of the MCE is to allocate radio resources to all cells in the MBSFN area that use the MBSFN scheme for multi-cell MBSFN transmission. In addition to time/frequency radio resources, it also includes determining detailed radio resource configurations, such as modulation and coding schemes. MCE participates in MBMS session control signaling.
  • E-MBMS GW Evolution MBMS Gateway - Evolved-MBMS Gateway
  • the E-MBMS gateway is a logical entity - this does not preclude the possibility that the entity belongs to other network elements.
  • the entity is located between the BM-SC (Broadcast-Multicast Service Centre) and the eNB. Its basic function is to transmit and broadcast MBMS data packets processed by the synchronization protocol to the corresponding eNB.
  • the E-MBMS gateway has a Packet Data Convergence Protocol (PDCP) layer, and sends MBMS user data to the eNB by means of IP multicast.
  • PDCP Packet Data Convergence Protocol
  • the E-MBMS gateway performs MBMS session control signaling (session start/end) to the Evolved Universal Terrestrial Radio Access Network (E-UTRAN).
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • the "M3" interface is the control plane interface: MCE-MME
  • This interface is located between the MME and the MCE.
  • the corresponding defined AP Application Part
  • MB Evolution Packet System
  • This process includes, for example, the start and end of an MBMS session.
  • the "M2" interface is the control plane interface: MCE-eNB
  • the interface is configured to transmit at least wireless configuration data and session control signaling for the eNB of the multi-cell transmission mode.
  • SCTP is used for signaling transmission, that is, application of PTP signaling.
  • the "M 1" interface is the user plane interface: MBMS GW-eNB
  • This interface is a pure user interface.
  • PTM Point-to-Multipoint Point to Multi-point
  • the resources used for carrying the MBMS service are designed with a special subframe (referred to as an MBSFN subframe structure), and a longer CP (a cyclic prefix in the OFDMA symbol) is configured. ), to ensure that the UE can receive signals transmitted over a longer distance.
  • MBSFN subframe structure a special subframe
  • CP a cyclic prefix in the OFDMA symbol
  • the transmission resources of the MBMS service are coordinated and controlled by the MCE. If the transmission area of an MBMS service is only an isolated cell (referred to as a single-cell MBMS service), the MCE is also responsible for allocating resources.
  • the allocated resources are in the form of MBSFN subframes, which may result in inflexible resource allocation. If there are remaining resources in the subframe where the MBMS service is located, it cannot be allocated to the unicast service, resulting in waste of resources.
  • the main purpose of the present invention is to provide a method and a device for transmitting a broadcast service in an LTE system, which are used to solve the problem that when a single cell MBMS service is transmitted, resources are allocated by the MCE, the resource allocation is not flexible enough, and the resource is wasted. problem.
  • a method for transmitting a broadcast service in an LTE system comprising:
  • the multi-cell multicast coordination entity MCE determines whether the transmission range of the multimedia broadcast multicast service MBMS is a single-cell area. For a single-cell MBMS service, the MCE sends the service parameter of the MBMS service to the evolved base station eNB through the session start signaling, and indicates the eNB. The service is a single-cell MBMS service; After receiving the session start signaling, the eNB allocates resources to the MBMS service according to the service parameters of the MBMS service, and sends the data of the MBMS service on the allocated resources.
  • the eNB allocates resources in a normal subframe to carry the single-cell MBMS service; or the eNB allocates resources in a normal subframe to carry the single-cell MBMS service, and the single-cell MBMS The service shares one subframe resource with the normal service; or the eNB allocates resources in the MBSFN subframe for carrying the single-cell MBMS service.
  • the MCE determines whether the MBMS service is a single-cell MBMS service according to the MBMS service area SA parameter value carried in the session start signaling and the corresponding list of the MBMS service area and the cell cell, and the MBMS service area includes only one In the case of the cell, the MBMS service is determined to be a single cell MBMS service.
  • the method for determining, by the MCE, whether the transmission range of the MBMS is a single cell area further includes:
  • the eNB reports to the MCE that the UE receives the MBMS service
  • the MCE determines that the MBMS service area includes multiple cells according to the MBMS service area parameter value carried in the session start signaling and the corresponding list of the MBMS service area and the cell, the MCE receives the UE according to the UE reported by the eNB.
  • the situation of the MBMS service is judged whether there is only one cell that needs to send the MBMS service, or whether a plurality of cells that need to send the MBMS service are neighboring cells, and if there is only one cell that needs to send the MBMS service, or If the multiple cells that send the MBMS service are not neighboring cells, the MBMS service is determined to be a single-cell MBMS service, otherwise the MBMS service is determined to be a multi-cell MBMS service.
  • the MCE determines whether the transmission range of the MBMS is a square of a single cell area.
  • the law is specifically:
  • the present invention further provides a transmission apparatus for a broadcast service in an LTE system, where the apparatus includes:
  • the determining module is located in the MCE, and is used to determine whether the sending range of the MBMS service is a single cell area;
  • a scheduling module located in the MCE, is configured to: when the MBMS service is a single cell service, send a service parameter of the MBMS service to the eNB by using a session start signaling, and indicate that the eNB is a single cell MBMS service; When the MBMS service is a multi-cell service, perform unified resource allocation on the MBMS service;
  • the allocation module is located in the eNB, and is configured to perform resource allocation on the MBMS service according to the service parameter of the MBMS service when the MBMS service is a single cell service.
  • the allocating module allocates resources in a normal subframe to carry the single-cell MBMS service; or the allocation module allocates resources in a normal subframe to carry the single-cell MBMS service, and the single The cell MBMS service shares one subframe resource with the normal service; or the eNB allocates resources in the MBSFN subframe for carrying the single cell MBMS service.
  • the determining module determines, according to the MBMS service area parameter value carried in the session start signaling and the corresponding list of the MBMS service area and the cell that is saved by itself, whether the MBMS service is a single cell MBMS service, and when the MBMS service area is used. When only one cell is included, it is determined that the MBMS service is a single cell MBMS service.
  • the device further includes:
  • the reporting module is located at the eNB, and is configured to report, by the determining module, that the UE receives the MBMS service;
  • the judging module determines, according to the MBMS service area parameter value carried in the session start signaling and the corresponding list of the MBMS service area and the cell that is saved by the UE, that the MBMS service area includes multiple cells, and further reports the UE according to the reporting module.
  • the case of receiving the MBMS service determines whether there is only one cell that needs to send the MBMS service, or whether a plurality of cells that need to send the MBMS service are neighboring cells, and if the cell that needs to send the MBMS service is only If the multiple cells that need to send the MBMS service are not neighboring cells, the MBMS service is determined to be a single cell MBMS service, otherwise the MBMS service is determined to be a multi-cell MBMS service.
  • the determining module determines whether the MBMS service is a single cell MBMS service, according to an indication identifier that is in the session start signaling, indicating whether the MBMS service is a single cell MBMS service.
  • the present invention transmits only the configuration parameters of the MBMS service to the eNB for the single-cell MBMS, and does not perform unified scheduling of resources.
  • the eNB After receiving the session start signaling of the single-cell MBMS service, the eNB allocates resources to the MBMS service, and the eNB can perform service according to the service.
  • the quantity requirement allocates an MBSFN subframe resource, or allocates a resource in a normal subframe to carry an MBMS service, and can share one subframe resource with a common service.
  • the invention improves resource utilization under the single cell MBMS service and improves the flexibility of resource allocation.
  • Figure 1 shows the architecture of the MBMS system designed in 3GPP Release 9.
  • FIG. 2 is a flow chart of a method for transmitting a broadcast service in an LTE system according to Embodiment 1 of the present invention
  • FIG. 3 is a structural diagram of a transmission apparatus for a broadcast service in an LTE system according to the present invention. detailed description
  • the basic idea of the invention is: to use the existing MBMS system architecture to centrally control the core network
  • the function is simplified.
  • the eNB allocates the resources of the single cell MBMS service.
  • the eNB can allocate resources in the normal subframe to carry the MBMS service, and can share one subframe resource with the normal service.
  • Considering factors such as the location change of the user who is willing to receive the MBMS service, in the case of a change in the MBMS service area (from multi-cell transmission to single-cell transmission or from single-cell transmission to multi-cell transmission), at the MCE and the eNB Perform the necessary signaling interactions between them and perform resource scheduling functions between the two.
  • the MCE determines the MBMS service area in the session start signaling (MBMS Service Area, The abbreviated value of the SA parameter and the UE received by the eNB to determine whether a certain MBMS service is a single cell service. For a single cell service, the MCE instructs the eNB to perform resource allocation.
  • 2 is a flowchart of a method for transmitting a broadcast service in an LTE system according to Embodiment 1 of the present invention, and the specific steps are as follows:
  • Step 101 The BM-SC initiates session start signaling for a certain MBMS service according to the existing process, and the session start signaling carries an MBMS Service Area parameter; the session start signaling is sent to the MCE by the MME;
  • Step 102 After receiving the session start signaling, the MCE determines whether the transmission area of the MBMS service is a single cell according to the value of the MBMS Service Area and/or the UE receiving the MBMS service reported by the eNB, if it is a single cell service. Then perform step 104; otherwise, perform step 103;
  • the method for determining whether the MMS service transmission area is a single cell according to the value of the configured MBMS Service Area and/or the UE receiving the MBMS service reported by the eNB is: According to the prior art, the eNB reports the SA information corresponding to the cell (cell) under its jurisdiction, that is, the MCE maintains a corresponding list of cells and SAs below it, for example, SA1 corresponds to cell 2 in eNB1, and cell 4 in eNB2. The cell in the eNBn, etc.; Which cells are under; If the SA of the MBMS service contains only one cell, the MCE can determine that this is a single-cell MBMS service.
  • the eNB may initiate some process to determine whether a UE is willing to receive a certain MBMS service within its coverage, and notify the MCE of the UE receiving the MBMS service by signaling.
  • the MCE can determine whether the MBMS service is a single-cell MBMS service, and the cell that needs to send the MBMS service only needs to consider the corresponding list of the SA and the cell and the UE receiving the MBMS service in the cell under the SA. If the multiple cells that need to send the MBMS service are not neighboring cells, the MCE may determine that, for the cells, the MBMS service is a single-cell MBMS service;
  • Step 103 For the multi-cell MBMS service, the MCE performs unified resource scheduling on the MBMS service according to the existing protocol, and sends the resource scheduling information to the eNB.
  • the eNB sends the data of the MBMS service on the allocated resource according to the configuration of the MCE. , the process ends;
  • Step 104 For a single-cell MBMS service, the MCE does not perform unified resource allocation on the single-cell MBMS service, and only sends the service parameter of the service to the eNB, and indicates that the eNB is a single-cell service, and the service parameter includes: service identifier. Service quality of service (Qos) parameters, such as the rate of service transmission, business duration, and so on.
  • Qos Service quality of service
  • Step 105 After receiving the session start signaling of the single cell MBMS service, the eNB allocates the MBMS service according to the service parameter of the MBMS service, and sends the data of the MBMS service on the allocated resource.
  • the eNB may allocate resources in a normal subframe to carry the single-cell MBMS service, and the single-cell MBMS service may share one subframe resource with a common service; or the eNB allocates resources in an MBSFN subframe. Used to carry the single cell MBMS service.
  • the service area is updated
  • the MBMS service area is changed from a multi-cell to a single cell.
  • Step 201 When a certain MBMS is performing multi-cell transmission according to the prior art, the eNB in the service area initiates determining whether there is a UE within the coverage that is willing to receive the MBMS service. If no UE is willing to receive, the eNB will inform the information. MCE;
  • Step 202 The MCE receives the information about the MBMS service received by the UE reported by each eNB, and combines the corresponding list information of the SA and the Cell to determine whether the current MBMS service becomes a single-cell MBMS service. If the next transmission area of the MBMS service is found only If a cell or a sent cell is not a neighboring cell, step 203 is performed;
  • Step 203 The MCE sends a signaling to notify the eNB that the service will be converted into a single cell service.
  • the MCE simultaneously sends signaling to notify other eNBs that belong to the service area, and suspends the sending of the service;
  • Step 204 After receiving the session start signaling of the single cell MBMS service, the eNB performs resource allocation on the service, and sends the data of the MBMS service on the allocated resource.
  • Step 301 When an MBMS service is implemented according to the implementation The methods described in examples 1 and 2 are performing single cell transmission; the eNB in the service area also needs to periodically initiate some processes to determine the coverage thereof. Whether the UE is willing to receive the MBMS service, if a cell originally suspends the transmission of the MBMS service, and the UE is willing to receive, the eNB will inform the MCE of the information;
  • Step 302 The MCE receives the service reception status information reported by each eNB, and comprehensively considers the corresponding list of the SA and the cell to determine whether the current MBMS service needs to be changed to multi-cell transmission. If the next transmission area of the service is found to be extended by the single cell, In the multi-cell format, step 303 is performed;
  • Step 303 The MCE sends a signaling to notify the eNB in the newly determined service area that the service is to be converted into a multi-cell service, and performs unified resource scheduling on the service.
  • Step 304 After receiving the session update signaling of the multi-cell MBMS service, the eNB sends the data of the MBMS service on the allocated resource according to the configuration of the MCE according to the prior art.
  • Step 401 The BM-SC carries an indication in the existing signaling whether the MBMS service is a single-cell MBMS service indication identifier, and then initiates a session start signaling according to an existing procedure;
  • Step 402 The session start signaling is sent to the MCE by the MME. Similarly, the signaling carries whether the MBMS service is a single cell MBMS service indication identifier.
  • Step 403 After the MCE receives the session start signaling configured with the single-cell MBMS service indication identifier, the MCE does not allocate resources to the MBMS service, but only sends the service parameter of the service to the eNB, and indicates that the eNB is a single-cell MBMS.
  • Step 404 After receiving the session start signaling of the single cell MBMS service, the eNB allocates the resource according to the service parameter of the MBMS service, and sends the data of the MBMS service on the allocated resource.
  • the eNB may allocate resources in a normal subframe for carrying the MBMS service, and One subframe resource may be shared with the normal service; or the eNB allocates resources in the MBSFN subframe to carry the single-cell MBMS service.
  • the present invention also provides a transmission apparatus for a broadcast service in an LTE system.
  • the modules in the device are all designed to implement the steps of the foregoing method, but the present invention is not limited to the following embodiments. Any device and module that can implement the above method should be included in the scope of the present invention. And in the following description, the same contents as the foregoing methods are omitted here to save space.
  • FIG. 3 is a structural diagram of a transmission apparatus for a broadcast service in an LTE system according to an embodiment of the present invention, where the apparatus includes: a determination module, a scheduling module, an allocation module, and a reporting module.
  • the determining module is located in the MCE, and is used to determine whether the sending range of the MBMS service is a single cell area;
  • a scheduling module located in the MCE, is configured to: when the MBMS service is a single cell service, send a service parameter of the MBMS service to the eNB by using a session start signaling, and indicate that the eNB is a single cell MBMS service; When the MBMS service is a multi-cell service, perform unified resource allocation on the MBMS service;
  • the allocation module is located in the eNB, and is configured to perform resource allocation on the MBMS service according to the service parameter of the MBMS service when the MBMS service is a single cell service.
  • the allocation module allocates resources in the normal subframe to carry the single-cell MBMS service; or the allocation module allocates resources in the normal subframe to carry the single-cell MBMS service, and the single-cell MBMS service and the common The service shares one subframe resource; or the eNB allocates resources in the MBSFN subframe to carry the single-cell MBMS service.
  • the determining module determines whether the MBMS service is a single-cell MBMS service according to the MBMS service area parameter value carried in the session start signaling and the corresponding list of the MBMS service area and the cell that is saved, and the MBMS service area includes only one In the case of a cell, it is determined
  • the MBMS service is a single cell MBMS service.
  • the device further includes an upper module, where the module is located at the eNB, and is configured to report, to the determining module, a situation in which the UE receives the MBMS service, and the determining module is configured to: according to the MBMS service area parameter value carried in the session start signaling And determining, by the corresponding list of the MBMS service area and the cell, that the MBMS service area includes the multi-cell, and further determining, according to the situation that the UE reported by the reporting module receives the MBMS service, the cell that needs to send the MBMS service Whether there is only one, or whether a plurality of cells that need to send the MBMS service are neighboring cells, and if there is only one cell that needs to send the MBMS service, or between multiple cells that need to send the MBMS service, The neighboring cell determines that the MBMS service is a single-cell MBMS service, otherwise it determines that the MBMS service is a multi-cell MBMS service.
  • the determining module determines whether the MBMS service is a single cell MBMS service, according to an indication identifier that is in the session start signaling, indicating whether the MBMS service is a single cell MBMS service.
  • the MCE For the single-cell MBMS, the MCE only sends the configuration parameters of the MBMS service to the eNB, and does not perform unified scheduling of resources.
  • the eNB After receiving the session start signaling of the single-cell MBMS service, the eNB allocates resources to the MBMS service, and the eNB can The MBSFN subframe resources are allocated according to the traffic demand, or the resources in the normal subframe are allocated to carry the MBMS service, and one subframe resource can be shared with the common service.
  • the invention can improve the resource utilization and resource allocation flexibility of the single cell MBMS service.

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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 porte sur un procédé et un dispositif pour l'émission d'un service de diffusion dans un système d'évolution à long terme (LTE), lesquels sont utilisés pour résoudre le défaut technique de perte de ressource, lorsqu'un service de service de diffusion multidiffusion multimédia (MBMS) à cellule unique est émis, la ressource étant allouée par une entité de coordination de multidiffusion/multicellule (MCE) et l'allocation de la ressource n'étant pas flexible. Dans l'invention, pour le service MBMS à cellule unique, la MCE transmet uniquement les paramètres de configuration de service MBMS à un nœud B évolué (eNB), et ne réalise pas une programmation unifiée sur la ressource, après que le eNB reçoit un signal de démarrage de session de service MBMS à cellule unique, l'allocation de la ressource est réalisée sur le service MBMS, l'eNB peut allouer la ressource dans une sous-trame commune pour supporter le service MBMS, et peut également partager une ressource de sous-trame avec le service commun. Cette invention augmente à la fois le taux d'utilisation de ressource et améliore la flexibilité d'allocation de ressource dans le service MBMS à cellule unique.
PCT/CN2011/074129 2010-05-24 2011-05-16 Procédé et dispositif pour l'émission d'un service de diffusion dans un système d'évolution à long terme WO2011147268A1 (fr)

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