CN108307321B

CN108307321B - MBMS data transmission method, donor base station, relay node and system

Info

Publication number: CN108307321B
Application number: CN201610790271.0A
Authority: CN
Inventors: 魏立梅; 袁乃华; 范晨
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2021-05-18
Anticipated expiration: 2036-08-31
Also published as: CN108307321A

Abstract

The invention provides an MBMS data transmission method, a donor base station, a relay node and a system. Wherein, the method comprises the following steps: establishing an MBMS control channel on a control plane Un-C of an interface between a donor base station DeNB and a relay node RN; establishing an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the DeNB and the RN; a DeNB receives MBMS data on an MBMS bearer sent by a multimedia broadcast multicast service gateway MBMS GW; broadcasting control information of the MBMS data through an MBMS control channel; and broadcasting the MBMS data on the MBMS bearer through an MBMS service channel. The MBMS data transmission method, the donor base station, the relay node and the system provided by the invention broadcast the control information of the MBMS data in the MBMS control channel; and broadcasting the MBMS data through the MBMS service channel, thereby realizing the transmission of the MBMS data between the DeNB and the RN in the 3GPP protocol architecture.

Description

MBMS data transmission method, donor base station, relay node and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an MBMS data transmission method, a donor base station, a relay node, and a system.

Background

In order to solve the problems of network deployment cost and coverage, standardization organizations have begun to research the introduction of Relay Nodes (RN) into cellular systems, thereby increasing network coverage. In a third Generation Partnership Project (3rd Generation Partnership Project, referred to as 3GPP) protocol architecture, a Mobility Management Node (MME), a Serving-GateWay (S-GW), an evolved Node B (eNB), and a Relay Node (RN) are included.

Specifically, after the RN accesses to a cell controlled by a donor base station (Doner eNB, DeNB for short), the DeNB serves as an S1/X2 proxy of the RN, so that the information of S1/X2 can be forwarded between the RN and a related network element, thereby implementing data transmission between the RN and the related network element.

However, in the existing 3GPP protocol architecture, the DeNB cannot transmit Multimedia Broadcast Multicast Service (MBMS) data to the relay node RN, and therefore, the existing 3GPP protocol architecture cannot realize transmission of MBMS data between the DeNB and the RN.

Disclosure of Invention

The invention provides an MBMS data transmission method, a donor base station, a relay node and a system, which are used for realizing the transmission of MBMS data between a DeNB and an RN in a 3GPP protocol architecture.

The invention provides a MBMS data transmission method, which comprises the following steps:

establishing an MBMS control channel on a control surface Un-C of an interface between the relay node RN and the relay node RN;

establishing MBMS bearing and MBMS service channel on a user plane Un-U of an interface between the RN;

receiving MBMS data sent by a multimedia broadcast multicast service gateway MBMS GW;

broadcasting control information of the MBMS data through the MBMS control channel;

and broadcasting the MBMS data on the MBMS bearer through the MBMS service channel.

In an embodiment of the present invention, before establishing the MBMS control channel on the Un-C between the RN and the RN, the method further includes:

receiving a session start request message sent by a multi-cell multicast coordination entity MCE, wherein the session start request message is used for requesting to send the MBMS data on the MBMS bearer to a donor base station DeNB;

and determining the cell identification ID as the cell controlled by the RN according to the cell identification ID in the session starting request message.

In an embodiment of the present invention, the broadcasting the control information of the MBMS data through the MBMS control channel includes:

determining a wireless resource allocation mode of the MBMS control channel, wherein the wireless resource allocation mode comprises a static mode or a dynamic mode;

allocating wireless resources for the MBMS control channel according to the wireless resource allocation mode;

and broadcasting the control information of the MBMS data through the allocated radio resources.

In an embodiment of the present invention, the radio resource allocation manner is a static manner;

the allocating the radio resource to the MBMS control channel according to the radio resource allocation manner includes:

and allocating time domain resources, frequency domain resources and modulation and coding strategies MCS for the MBMS control channel according to the static mode.

In an embodiment of the present invention, the radio resource allocation manner is a dynamic manner;

and allocating time domain resources to the MBMS control channel according to the dynamic mode.

In an embodiment of the present invention, the broadcasting the MBMS data on the MBMS bearer through the MBMS service channel includes:

determining a wireless resource allocation mode of the MBMS service channel, wherein the wireless resource allocation mode comprises a static mode or a dynamic mode;

allocating wireless resources to the MBMS service channel according to the wireless resource allocation mode;

broadcasting the MBMS data on the MBMS bearer through the allocated radio resources.

the allocating the radio resources to the MBMS service channel according to the radio resource allocation manner includes:

and allocating time domain resources, frequency domain resources and modulation and coding strategies MCS for the MBMS service channel according to the static mode.

and allocating time domain resources to the MBMS service channel according to the dynamic mode.

The invention provides a method for transmitting Media Broadcast Multicast Service (MBMS) data, which comprises the following steps:

establishing an MBMS control channel on a control plane Un-C of an interface between the donor base station DeNB and a donor base station DeNB;

establishing an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the DeNB and the DeNB;

receiving control information of the MBMS data broadcasted by the DeNB through the MBMS control channel;

and receiving the MBMS data on the MBMS bearer broadcast by the DeNB through the MBMS service channel according to the control information.

The invention provides a donor base station DeNB, which is characterized by comprising the following components: the establishing module is used for establishing an MBMS control channel on a control surface Un-C of an interface between the relay node RN and the relay node RN;

the establishing module is also used for establishing an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the RN and the terminal;

the receiving module is used for receiving MBMS data on the MBMS bearer sent by a multimedia broadcast multicast service gateway (MBMS GW);

a sending module, configured to broadcast control information of the MBMS data through the MBMS control channel;

the sending module is further configured to broadcast the MBMS data on the MBMS bearer through the MBMS service channel.

In an embodiment of the invention, the system further comprises a confirmation module,

the receiving module is further configured to receive the session initiation request message sent by the MCE, where the message is used to request sending of MBMS data to the DeNB;

and the confirmation module is used for determining the cell identification ID as the cell controlled by the RN according to the cell identification ID in the session starting request message.

In an embodiment of the present invention, the sending module is specifically configured to determine a radio resource allocation manner of the MBMS control channel, where the radio resource allocation manner includes a static manner or a dynamic manner;

the sending module is specifically configured to allocate radio resources to the MBMS control channel according to the radio resource allocation manner;

the sending module is specifically configured to broadcast the control information of the MBMS data through the allocated radio resource.

In an embodiment of the present invention, the sending module is specifically configured to allocate a time domain resource, a frequency domain resource, and a modulation and coding scheme MCS to the MBMS control channel according to the static mode.

In an embodiment of the present invention, the sending module is specifically configured to allocate a time domain resource to the MBMS control channel according to the dynamic manner.

In an embodiment of the present invention, the sending module is specifically configured to determine a radio resource allocation manner of the MBMS service channel, where the radio resource allocation manner includes a static manner or a dynamic manner;

the sending module is specifically configured to allocate radio resources to the MBMS service channel according to the radio resource allocation manner;

the sending module is specifically configured to broadcast the MBMS data on the MBMS bearer through the allocated radio resource.

In an embodiment of the present invention, the sending module is specifically configured to allocate a time domain resource, a frequency domain resource, and a modulation and coding scheme MCS to the MBMS service channel according to the static mode.

In an embodiment of the present invention, the sending module is specifically configured to allocate a time domain resource to the MBMS service channel according to the dynamic manner.

The invention provides a Relay Node (RN), which comprises:

the establishing module is used for establishing an MBMS control channel on a control plane Un-C of an interface between the donor base station DeNB and a donor base station DeNB;

the establishing module is also used for establishing an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the DeNB and the DeNB;

a receiving module, configured to receive, through the MBMS control channel, control information of MBMS data broadcast by the DeNB;

the receiving module is further configured to receive, according to the control information, the MBMS data on the MBMS bearer broadcast by the DeNB through the MBMS service channel.

The invention provides a Multimedia Broadcast Multicast Service (MBMS) data transmission system, which comprises a donor base station DeNB and a relay node RN, wherein the donor base station DeNB is described in any embodiment of the invention, and the relay node RN is described in any embodiment of the invention.

The MBMS data transmission method, the donor base station, the relay node and the system provided by the invention establish an MBMS control channel on a control plane Un-C of an interface between the donor base station DeNB and the relay node RN; establishing an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the DeNB and the RN; the DeNB receives the MBMS data on the MBMS bearer sent by a multimedia broadcast multicast service gateway MBMS GW; broadcasting control information of the MBMS data through an MBMS control channel; and broadcasting the MBMS data through an MBMS service channel. The MBMS data transmission method, the donor base station, the relay node and the system provided by the invention broadcast the control information of the MBMS data in the MBMS control channel; and broadcasting the MBMS data through the MBMS service channel, thereby realizing the transmission of the MBMS data between the DeNB and the RN in the 3GPP protocol architecture.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the structure of the E-UTRAN components and interfaces;

fig. 2 is a flowchart illustrating a MBMS data transmission method according to a first embodiment of the present invention;

FIG. 3 is a schematic diagram of a new structure of a user plane of a Un interface of the MBMS data transmission method of the present invention;

fig. 4 is a schematic diagram of a newly added control plane structure of a Un interface in the MBMS data transmission method of the present invention;

fig. 5 is a flowchart illustrating a second MBMS data transmission method according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a third MBMS data transmission method according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a DeNB according to a first embodiment of the present invention;

fig. 8 is a schematic structural diagram of a DeNB according to a second embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a first embodiment of a RN according to the present invention;

fig. 10 is a schematic structural diagram of an MBMS data transmission system according to an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

FIG. 1 is a schematic diagram of the components and interfaces of an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). As shown in fig. 1, a mobile Management node (MME) and a Multi-Cell/Multicast Coordination Entity (MCE) are connected through an M3 interface, the MCE and a donor base station (donor eNB, DeNB) are connected through an M2 interface, and a multimedia broadcast Multicast service Gateway (MBMS Gateway, MBMS GW) and the DeNB are connected through an M1 interface. The MBMS GW sends the configuration information of the MBMS data to the DeNB through the M3 and M2 interfaces, and sends the MBMS data to the DeNB through the M1 interface, so that the transmission of the MBMS data from the MBMS GW to the DeNB is completed. An interface Un between a donor base station DeNB and a Relay Node RN comprises a control plane Un-C and a user plane Un-U, and the DeNB and the Relay Node (RN for short) communicate through the Un-C and the Un-U. The Un-C is used for transmitting user data, and the Un-C is used for transmitting configuration information of the Un-C. In the current 3GPP protocol, as far as the 3GPP R13 protocol, the interface between DeNB and RN only supports the transmission of non-MBMS data services, and does not support the transmission of MBMS services transmitted by MBMS bearers.

Fig. 2 is a flowchart illustrating a first embodiment of a method for transmitting MBMS data according to the present invention, which can be performed by a donor base station DeNB. As shown in fig. 1, the method for transmitting MBMS data in MBMS service may include:

s201: and establishing an MBMS control channel on a control plane Un-C of an interface between the relay node RN and the relay node.

In the 3GPP protocol architecture, the DeNB needs to establish an MBMS control channel on the Un-C between the DeNB and the RN before transmitting MBMS data to the RN. So that the DeNB transmits the control information of the MBMS data to the RN through the MBMS control channel.

Optionally, one cell of the DeNB has at most one MBMS control channel. The MBMS Control Channel adopts UM mode Radio Link Control protocol (RLC) entity, maps the MBMS Control Channel to a Downlink Shared Channel (DL-SCH), and further maps the DL-SCH to a Physical Downlink Shared Channel (PDSCH).

S202: and establishing MBMS bearing and MBMS service channel on a user plane Un-U of an interface between the RN. The MBMS bearer corresponds to the MBMS service channels one to one.

Similarly, in the 3GPP protocol architecture, the DeNB establishes an MBMS bearer and an MBMS traffic channel on the Un-U between the DeNB and the RN before transmitting the MBMS data to the RN. And the DeNB receives the MBMS data on the MBMS bearer through the MBMS GW and sends the MBMS data on the bearer to the RN through the MBMS service channel.

Specifically, the MBMS carries data for carrying the MBMS. The DeNB allocates UM mode RLC entities for each MBMS bearer on Un-U and allocates one MBMS service channel for each MBMS bearer. And the DeNB broadcasts the data on the MBMS bearer through the MBMS service channel.

Optionally, the MBMS service channel uses an UM mode RLC entity, and multiple MBMS service channels are mapped to the same DL-SCH in a frequency division or time division multiplexing manner, and the DL-SCH is further mapped to a PDSCH. Wherein, MBMS service channel and MBMS control channel are mapped to different DL-SCH.

S203: and receiving MBMS data on the MBMS bearer sent by a multimedia broadcast multicast service gateway (MBMS GW).

After the MBMS control channel and the MBMS traffic channel are established, the DeNB may receive MBMS data on the MBMS bearer sent by the MBMS GW through the M1 interface.

S204: control information for MBMS data is broadcast over an MBMS control channel.

The DeNB transmits control information of the MBMS data through the MBMS control channel established in S201.

Optionally, the control information of the MBMS data is configuration information of an MBMS service channel, and the configuration information of the MBMS service channel is generated by an RRC entity of the DeNB.

S205: and broadcasting the MBMS data loaded on the MBMS through an MBMS service channel.

And the DeNB sends the MBMS data on the MBMS bearer through the MBMS service channel established in S202.

In the MBMS data transmission method provided in this embodiment, an MBMS control channel is established on a control plane Un-C of an interface between a donor base station DeNB and a relay node RN; establishing an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the DeNB and the RN; a DeNB receives MBMS data on an MBMS bearer sent by a multimedia broadcast multicast service gateway MBMS GW; broadcasting control information of the MBMS data through an MBMS control channel; and broadcasting the MBMS data through an MBMS service channel. In the MBMS data transmission method provided in this embodiment, control information of MBMS data is broadcast on an MBMS control channel; and broadcasting the MBMS data on the MBMS bearer through an MBMS service channel, thereby realizing the transmission of the MBMS data between the DeNB and the RN in a 3GPP protocol architecture.

For example, on the basis of the foregoing embodiments, fig. 3 is a schematic diagram of a new structure of a user plane of a Un interface in the MBMS data transmission method of the present invention. As shown in fig. 3, the DeNB carries MBMS data received from the MBMS GW through an MBMS bearer, allocates an RLC entity of UM mode to the MBMS bearer in the RLC layer, and performs processing such as segmentation and combination on the MBMS data in the RLC layer. And then, mapping RLC PDU (Protocol Data Unit) obtained by the RLC entity processing in UM mode carried by MBMS to MBMS service channel, and further mapping RLC PDU on the MBMS service channel to DL-SCH by the processing of MAC layer. The processing of the MAC layer includes multiplexing of MBMS traffic channels, etc. And finally mapping the TB (Transport Block) on the DL-SCH to the PDSCH for transmission after carrying out L1 channel coding and modulation. One cell may have multiple PDSCHs carrying MBMS traffic channels. Optionally, multiple MBMS traffic channels may multiplex the same DL-SCH and PDSCH in a frequency division multiplexing or time division multiplexing manner, thereby improving resource utilization efficiency.

Fig. 4 is a schematic diagram of a newly added control plane structure of a Un interface in the MBMS data transmission method of the present invention. As shown in fig. 4, the DeNB allocates an RLC entity of UM mode for control information of MBMS data in the RLC layer. Optionally, the Control information of the MBMS data is configuration information of an MBMS service channel, and the configuration information of the MBMS service channel is generated by a Radio Resource Control (RRC) entity of the DeNB. And then, mapping RLC PDU generated by UM mode RLC entity of control information of MBMS data to MBMS control channel, and further mapping RLC PDU on the MBMS control channel to DL-SCH through MAC layer processing. And finally mapping the TB on the DL-SCH to the PDSCH for transmission after carrying out L1-layer channel coding and modulation. Wherein each cell includes at most one MBMS control channel.

Further, in the foregoing embodiments, before S201, the method further includes: and receiving a session start request message sent by the MCE, wherein the message is used for requesting to send the MBMS data on the MBMS bearer to the DeNB. And determining the cell ID as the cell controlled by the RN according to the cell ID in the session request message.

Specifically, after receiving a session initiation request message sent by the MCE, according to a cell identifier ID in the session initiation request message, if the cell identifier ID is a cell controlled by the RN, the DeNB performs admission control on an MBMS service that needs to be sent to the RN by the DeNB at the Un interface according to RN subframe configuration. Wherein, the number of DL subframes in the RN subframe configuration determines the total rate of the traffic that the DeNB can transmit to the RN through the Un interface. And determining whether the current MBMS can be transmitted to the RN through the Un interface or not according to the difference value between the total rate of the services which can be transmitted to the RN by the DeNB through the Un interface and the service rate which can be transmitted to the RN by the DeNB through the Un interface. Alternatively, the remaining total rate may be obtained by subtracting the sum of the traffic rates that have been transmitted to the RN over the Un interface from the total rate. If the residual total rate is greater than the rate of the currently accessed MBMS service, determining that the current MBMS service can be transmitted to the RN through the Un interface in a relay manner; otherwise, the Un interface can not relay and transmit the current MBMS service to the RN. And after successful admission, the DeNB feeds back the message of successful admission to the MCE, sends the session starting request message to the corresponding RN through RRC signaling, establishes M1 connection with the MBMS GW, and receives the MBMS service data indicated in the session starting request message from the MBMS GW.

Further, in the above embodiment, S204 includes: and determining a wireless resource allocation mode of the MBMS control channel, and allocating wireless resources for the MBMS control channel according to the wireless resource allocation mode. The radio resource allocation mode includes a static mode and a dynamic mode. And broadcasts control information of the MBMS data through the allocated radio resource. The control information of the MBMS data may be configuration information of an MBMS traffic channel.

When the DeNB receives the session initiation request message, if the RRC layer finds that the MBMS control channel is not established in the cell, the MBMS control channel is newly established in the control plane of the Un interface of the cell, and the newly established MBMS control channel adopts the RLC entity in the UM mode and configures the MAC layer. The RRC layer determines the radio resource allocation modes of the MBMS control channel, including a static mode and a dynamic mode, and instructs the MAC layer to allocate radio resources for the MBMS control channel according to the determined radio resource allocation modes. And the RRC layer informs the RN of the MBMS control channel radio resource allocation information reported by the MAC layer through RRC signaling and configures the information to L1.

When the DeNB receives the session initiation request message, if the RRC layer finds that the MBMS control channel is established in the cell, the radio resources are reallocated to the MBMS control channel. Specifically, the MAC layer is instructed by the RRC layer to reallocate radio resources for the MBMS control channel. And after the MAC layer reallocates the radio resources for the MBMS control channel, indicating the MBMS control channel radio resource allocation information to the RRC layer. And the RRC layer informs the RN of the MBMS control channel radio resource allocation information reported by the MAC layer through RRC signaling and configures the radio resource allocation information to the L1 layer.

Optionally, after allocating the radio resource for the MBMS Control Channel, the DeNB notifies the RN of all or part of the MBMS Control Channel resource allocation information through an RRC signaling, and sends the remaining resource allocation information to the RN through a Relay-Physical Downlink Control Channel (R-PDCCH) that is dynamically scheduled under the condition that the MBMS Control Channel is allocated with the resource in a dynamic manner.

Alternatively, since the MBMS control channel carries the configuration information of the MBMS service channel, as the number of MBMS service channels increases, the radio resources of the MBMS control channel may be insufficient. Therefore, each time the DeNB receives the session initiation request message, it needs to allocate or reallocate radio resources for the MBMS control channel.

Further, when the radio resource allocation mode of the MBMS control channel is a static mode, the MAC layer allocates or reallocates time domain resources, frequency domain resources, MCS, and the like to the MBMS control channel, and reports the radio resource allocation information of the MBMS control channel to the RRC layer.

When the wireless resource allocation mode of the MBMS control channel is a dynamic mode, the MAC layer allocates or reallocates time domain resources for the MBMS control channel and reports the MBMS control channel wireless resource allocation information to the RRC layer.

The DeNB broadcasts the control information of the MBMS data according to the radio resource allocated to the MBMS control channel, and includes: the RRC layer sends the control information of the MBMS data to an UM mode RLC entity of the RLC layer, RLC PDU is generated through the processing of the RLC entity, the PDU is transmitted to the MAC layer through the MBMS control channel, is mapped to DL-SCH corresponding to the MBMS control channel through the processing of the MAC layer, and is sent to L1 through the DL-SCH. And L1 performs channel coding and modulation on the transport block on the DL-SCH, maps the transport block on a PDSCH corresponding to the MBMS control channel, and broadcasts the transport block to each RN through the PDSCH.

When the radio resource allocation mode of the MBMS control channel is a static mode, the L1 layer performs channel coding and modulation on a transport block on the DL-SCH corresponding to the MBMS control channel according to the MCS in the radio resource allocation information of the MBMS control channel delivered by the RRC layer, and transmits the PDSCH corresponding to the MBMS control channel on the corresponding time domain and frequency domain resources according to the time domain and frequency domain resource allocation information in the configuration information.

When the allocation mode of the radio resource of the MBMS control channel is a dynamic mode, the MAC layer allocates the frequency domain resource and the MCS to the MBMS control channel in a dynamic scheduling mode, and issues the scheduling information to L1. L1 sends the scheduling information to RN through R-PDCCH scrambled by Relay MBMS control Channel-Radio Network temporary Identity (RMCCH-RNTI) in the subframe indicated by the MBMS control Channel time domain resource in the MBMS control Channel Radio resource allocation information configuration, and sends PDSCH corresponding to R-MCCH through the frequency domain resource and MCS indicated by the scheduling information on the R-PDCCH in the same subframe.

Preferably, the RMCCH-RNTI may be allocated a fixed value from the protocol.

Further, in the above embodiment, S205 includes: and determining a wireless resource allocation mode of the MBMS service channel, and allocating wireless resources for the MBMS service channel according to the wireless resource allocation mode. The radio resource allocation mode includes a static mode and a dynamic mode. And broadcasting the MBMS data on the MBMS bearer through the allocated radio resource.

When DeNB receives the session start request, RRC layer creates MBMS load and MBMS service channel for MBMS service, the MBMS load adopts RLC entity of UM mode. And configuring an MAC layer for MBMS bearing and an MBMS service channel. The RRC layer determines the radio resource allocation mode of the MBMS service channel, including a static mode and a dynamic mode, and indicates the MAC layer to allocate radio resources for the MBMS service channel according to the radio resource allocation mode. And the RRC layer informs the RN of the radio resource allocation information of the DL-SCH of the MBMA service channel type reported by the MAC layer through an MBMS control channel and configures the radio resource allocation information to L1.

Optionally, after allocating the radio resource for the MBMS service channel, the DeNB sends the resource allocation information of all or part of the MBMS service channel to the RN through the MBMS control channel, and sends the remaining resource allocation information to the RN through the dynamically scheduled R-PDCCH under the condition that the MBMS control channel carries part of the MBMS service channel resource allocation information.

Further, when the RRC layer determines that the radio resource allocation mode of the MBMS service channel is a static mode, the MAC layer maps the MBMS service channel to the DL-SCH adopting the static resource allocation mode. And determining the multiplexing relationship between the MBMS service channel and other MBMS service channels mapped on the DL-SCH, re-allocating time domain resources, frequency domain resources and MCS to the DL-SCH, and re-determining the time domain resources occupied by each MBMS service channel on the DL-SCH. And reporting the wireless resource allocation information of the DL-SCH to an RRC layer. The information includes: time domain resources, frequency domain resources and MCS of the DL-SCH, and time domain resources occupied by each MBMS service channel on the DL-SCH.

When the RRC layer determines that the radio resource allocation mode of the MBMS service channel is a dynamic mode, the MAC layer maps the MBMS service channel to the DL-SCH which adopts the dynamic resource allocation mode. And determining the multiplexing relationship between the MBMS service channel and other MBMS service channels mapped on the DL-SCH, re-allocating time domain resources to the DL-SCH, and re-determining the time domain resources occupied by each MBMS service channel on the DL-SCH. And reporting the wireless resource allocation information of the DL-SCH to an RRC layer. The information includes: time domain resources of the DL-SCH and time domain resources occupied by each MBMS service channel on the DL-SCH.

The method for broadcasting the MBMS data by the DeNB through the radio resources allocated to the MBMS service channel comprises the following steps: and the MAC layer schedules RLC PDU on each MBMS service channel according to the resource allocation mode of DL-SCH of each MBMS service channel type determined by the RRC layer to generate a transmission block on the DL-SCH. And the transmission blocks on the DL-SCH are mapped to the corresponding PDSCH through channel coding and modulation, and are broadcast to each RN through the PDSCH.

When the radio resource allocation mode of the MBMS service channel is a static mode, the RRC layer configures the radio resource allocation information of the DL-SCH of the MBMS service channel to L1, and the MAC layer schedules the RLC PDU of each MBMS service channel according to the radio resource allocation mode of the DL-SCH, generates the MAC PDU and sends the MAC PDU to the DL-SCH. L1 performs channel coding and modulation on the transport block on the DL-SCH according to the MCS in the radio resource allocation information of the DL-SCH, and then transmits the PDSCH on the corresponding time domain and frequency domain resources according to the radio resource allocation information of the DL-SCH.

When the wireless resource allocation mode of the MBMS service channel is a dynamic mode, the MAC layer allocates frequency domain resources and MCS for the DL-SCH of the MBMS service channel in a dynamic scheduling mode, and issues the scheduling information to L1. L1 sends the scheduling information to RN through R-PDCCH scrambled by RMTCH-RNTI in DL-SCH radio resource allocation information of MBMS service channel and a subframe indicated by DL-SCH time domain resource, and sends PDSCH corresponding to R-MTCH through frequency domain resource and MCS indicated by the scheduling information on R-PDCCH in the same subframe.

Preferably, the RMCCH-RNTI may be allocated a fixed value from the protocol.

Preferably, the DL-SCH of different MBMS service channels time-division multiplexes Un interface bandwidth, and the DL-SCH can use the same RMTCH-RNTI and allocate a fixed value to the RMTCH-RNTI on the protocol.

Fig. 5 is a flowchart illustrating a second embodiment of a method for transmitting MBMS data according to the present invention, where the method may be executed by a relay node RN. As shown in fig. 5, the MBMS data transmission method may include:

s501: and establishing an MBMS control channel on a control plane Un-C of an interface between the DeNB and the terminal.

In the 3GPP protocol architecture, before receiving MBMS data transmitted by the DeNB, the RN needs to establish an MBMS control channel on a Un-C between the DeNB and the RN. And enabling the RN to receive the control information of the MBMS data transmitted by the DeNB through the MBMS control channel.

Optionally, the MBMS control channel employs a UM mode RLC entity, mapping the MBMS control channel onto the DL-SCH, and further mapping the DL-SCH onto the PDSCH.

S502: and establishing an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the DeNB and the user plane Un-U. MBMS load and MBMS service channels are in one-to-one correspondence.

Similarly, in the 3GPP protocol architecture, the RN establishes an MBMS bearer and an MBMS traffic channel on a Un-U between the DeNB and the RN before receiving MBMS data transmitted by the DeNB. And enabling the RN to receive the MBMS data on the MBMS bearer through the MBMS service channel.

Specifically, the MBMS carries data for carrying the MBMS. A UM mode RLC entity is allocated on the Un-U for each MBMS bearer and an MBMS traffic channel is allocated for each MBMS bearer. And enabling the RN to receive MBMS data on the MBMS bearer broadcast by the DeNB through the MBMS service channel.

S503: and receiving the control information of the MBMS data broadcasted by the DeNB through the MBMS control channel.

The RN receives control information of MBMS data broadcast by the DeNB through the control channel established at S501.

S504: and receiving the MBMS bearer broadcast by the DeNB through the MBMS service channel according to the control information.

The RN receives the MBMS data on the MBMS bearer broadcast by the DeNB through the traffic channel established in S502.

In the MBMS data transmission method provided in this embodiment, an MBMS control channel is established on a control plane Un-C of an interface between an RN and a DeNB; establishing MBMS bearing and MBMS service channel on a user plane Un-U of an interface between the DeNB and the DeNB; and receiving the control information of the MBMS data broadcasted by the DeNB through the MBMS control channel. And receiving MBMS data on the MBMS bearer broadcast by the DeNB through an MBMS service channel according to the control information. In the MBMS data transmission method provided in this embodiment, the RN receives, through an MBMS control channel, control information of MBMS data broadcast by the DeNB; and receiving MBMS data on the MBMS bearer broadcast by the DeNB through an MBMS service channel, thereby realizing the transmission of the MBMS data between the DeNB and the RN in a 3GPP protocol architecture.

For example: the RN monitors the MBMS control channel, and obtains control information of MBMS data corresponding to the MBMS service, such as configuration information of the MBMS service channel, from the MBMS control channel. Therefore, the MBMS service channel is monitored according to the configuration information of the MBMS service channel, and corresponding MBMS data is extracted from the MBMS service channel according to the mapping relation between the MBMS bearer and the MBMS service channel.

Further, in the foregoing embodiment, after the RN receives the session start request message sent by the DeNB, the RRC layer determines whether to establish an MBMS control channel on the control plane Un-C of the Un, and if not, establishes the MBMS control channel on the control plane Un-C of the Un, where the MBMS control channel employs an RLC entity and configures the MAC layer.

When the RN receives the MBMS control channel resource allocation information sent by the DeNB through the RRC signaling, the RRC layer configures the MBMS control channel configuration information to the L1 layer, so that the L1 layer starts to monitor the MBMS control channel according to the configuration information of the MBMS control channel.

When the configuration information of the MBMS control channel includes the time domain resource, the frequency domain resource and the MCS of the MBMS control channel, the L1 receives the RMCCH-RNTI scrambled PDSCH according to the coding modulation mode indicated by the MCS, within the bandwidth indicated by the frequency domain resource in the subframe indicated by the time domain resource according to these information.

When the configuration information of the MBMS control channel only comprises the time domain resources of the MBMS control channel, L1 monitors the R-PDCCH scrambled by the RMCCH-RNTI in the subframe indicated by the time domain resources. And when the R-PDCCH scrambled by the RMCCH-RNTI is detected, receiving the PDSCH scrambled by the RMCCH-RNTI in the same subframe according to the scheduling information of the PDSCH on the R-PDCCH. L1 decodes the RMCCH-RNTI scrambled PDSCH, and submits the decoding result of the transport block on the PDSCH to the MAC layer. The MAC layer demultiplexes the transmission block, and submits the MAC SDU to an RLC entity corresponding to an MBMS control channel R-MCCH, and the RLC entity submits the RLC SDU obtained by processing to the RRC layer. The RRC layer parses the RLC SDU to obtain control information of the MBMS data, which may be DL-SCH configuration information of an MBMS service channel.

After receiving the session initiation request message sent by the DeNB, the RN also records configuration information such as the TMGI of the MBMS service in the session initiation request message. The TMGI (temporary Mobile Group Identity) is the Identity of the MBMS service that the RN needs to receive. The RN may query the configuration information of the MBMS service channel corresponding to the TMGI of the MBMS service in the MBMS service channel type DL-SCH configuration information on the MBMS control channel, and receive the MBMS service according to the configuration information of the MBMS service channel.

When the configuration information of the MBMS service channel includes time domain resources, frequency domain resources and MCS occupied by the MBMS service channel on the DL-SCH, L1 receives the RMCCH-RNTI scrambled PDSCH according to the coding modulation mode indicated by the MCS within the bandwidth indicated by the frequency domain resources in the subframe indicated by the time domain resources according to these information.

And when the configuration information of the MBMS service channel only comprises the time domain resources occupied by the MBMS service channel on the DL-SCH, L1 monitors the R-PDCCH scrambled by the RMCCH-RNTI in the subframe indicated by the time domain resources. And when the R-PDCCH scrambled by the RMCCH-RNTI is detected, receiving the PDSCH scrambled by the RMCCH-RNTI in the same subframe according to the scheduling information of the PDSCH on the R-PDCCH. L1 decodes the RMCCH-RNTI scrambled PDSCH, and submits the decoding result of the transport block on the PDSCH to the MAC layer. The MAC layer demultiplexes the transmission block, and submits the MAC SDU to an RLC entity corresponding to the R-MCCH, and the RLC entity submits the processed RLC SDU to a higher layer.

Based on the above embodiments, the present invention further provides another MBMS data transmission method, see fig. 6. Fig. 6 is a flowchart illustrating a third embodiment of a method for transmitting MBMS data of a multimedia broadcast multicast service according to the present invention, where the method for transmitting MBMS data includes:

s601, the group communication system application server GCS AS sends a TMGI allocation request message to the BMSC.

When the GCS AS prepares to send MBMS data by the MBMS bearer, a TMGI allocation request message is sent to the BMSC, and the TMGI allocation request message is used for requesting the BMSC to allocate the TMGI to the MBMS bearer.

S602, the BMSC returns a TMGI assignment response message to the GCS AS.

Wherein, the TMGI allocation response message includes that the BMSC allocates the TMGI for the MBMS bearer. Specifically, after receiving the TMGI allocation request message sent by the GCS AS, the BMSC allocates the TMGI to the MBMS bearer according to the request message, and carries the TMGI corresponding to the MBMS bearer in the TMGI allocation response message, and returns the TMGI to the GCS AS.

S603, GCS AS sends MBMS load activation request message to BMSC.

Before GCS AS sends MBMS data through MBMS bearer, GCS AS sends MBMS bearer activation request message to BMSC, the MBMS bearer activation request message is used to instruct BMSC to allocate resources for the MBMS bearer.

S604, the BMSC sends a conversation starting request message to the MBMS GW.

After receiving the MBMS bearer activation request message sent by the GCS AS, the BMSC allocates a stream identifier to the MBMS bearer, where the stream identifier and the TMGI of the MBMS bearer are used to mark the MBMS bearer and a broadcast area corresponding to the bearer, and sends a session initiation request message to the MBMS GW.

S605, the MBMS GW returns the conversation starting response message to the BMSC.

After receiving the session start request message, the MBMS GW generates an MBMS bearer context for the MBMS bearer, and returns a session start response message to the BMSC, where the session start response message carries configuration information of the MBMS bearer.

S606, BMSC returns MBMS load activation response message to GCS AS.

After receiving the session start response message sent by the MBMS GW, the BMSC returns an MBMS bearer activation response message to the GCS AS, where the MBMS bearer activation response message is used to indicate that the MBMS bearer is activated.

S607, the MBMS GW sends a session start request message to the mobility management entity MME.

After receiving the session start request message sent by the MBMS GW, the MME generates an MBMS bearer context according to the session start request message, and sends the session start request message to the MCE.

It should be noted that, there is no sequence between step S605 and step S607, step S605 may be executed first, step S607 may also be executed first, and of course, step S605 and step S607 may also be executed simultaneously.

S608, the MME sends a session initiation request message to the multi-cell multicast coordination entity MCE through the M3 interface.

And S609, the MCE sends a session starting request message to the DeNB through the M2 interface.

The MCE may pre-establish an M2 interface with the DeNB, and after the M2 interface is established, the MCE may send a session initiation request message to the DeNB through the M2 interface.

S610, an MBMS control channel is established on Un-C between the DeNB and the RN, and an MBMS service channel is established on Un-U between the DeNB and the RN.

After the establishment is successful, the DeNB sends a session initiation response message to the MCE through the M2 interface.

S611, the MCE sends a session initiation response message to the MME through the M3 interface.

After receiving the session initiation response message, the MCE sends the session initiation response message to the MME through the M3 interface.

S612, MME sends a conversation starting response message to MBMS GW.

And after receiving the session starting response message, the MME sends the session starting response message to the MBMS GW.

S613, the GCS AS transmits the MBMS data to the MBMS GW.

S614, the MBMS GW sends the MBMS data to the DeNB through the M1 interface.

The MBMS GW may pre-establish an M1 interface with the DeNB, and after the M1 interface is established, the MBMS GW may transmit MBMS data to the DeNB through the M1 interface.

S615: the DeNB receives the MBMS data through the M1 interface and broadcasts control information of the MBMS data through an MBMS control channel.

S616: and the DeNB broadcasts the MBMS data through the MBMS service channel.

S617, the RN broadcasts the received MBMS data. The RN receives the control information of the MBMS data through the MBMS control channel, and after receiving the data of the MBMS through the MBMS service channel, the RN can broadcast the data of the MBMS in a cell controlled by the RN.

The implementation principle and the beneficial effects of the MBMS data transmission method according to the embodiment of the present invention are similar to those of any of the above embodiments, and are not described herein again.

Fig. 7 is a schematic structural diagram of a DeNB according to a first embodiment of the present invention, and as shown in fig. 7, the DeNB may include:

an establishing module 701, configured to establish an MBMS control channel on a control plane Un-C of an interface between the relay node RN and the relay node RN;

the establishing module 701 is further configured to establish an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the ue and the RN; MBMS bearing and MBMS service are in one-to-one correspondence;

a receiving module 702, configured to receive MBMS data sent by a multimedia broadcast multicast service gateway MBMS GW; the MBMS data is the MBMS data on the MBMS bearer established before;

a sending module 703, configured to broadcast control information of MBMS data through an MBMS control channel;

a sending module 703 is configured to broadcast MBMS data on an MBMS bearer through an MBMS service channel.

Further, in the foregoing embodiments, the DeNB may further include a confirmation module 801, as shown in fig. 8, where fig. 8 is a schematic structural diagram of a second DeNB embodiment of the present invention. The receiving module 702 is further configured to receive a session initiation request message sent by the MCE, where the message is used to request to send MBMS data to the DeNB;

a confirming module 801, configured to determine, according to the cell identifier ID in the session initiation request message, that the cell identifier ID is a cell controlled by the RN.

Optionally, in the foregoing embodiment, the sending module 703 is specifically configured to determine a radio resource allocation manner of the MBMS control channel, where the radio resource allocation manner includes a static manner or a dynamic manner;

a sending module 703, configured to specifically allocate a radio resource for an MBMS control channel according to a radio resource allocation manner;

the sending module 703 is specifically configured to broadcast the control information of the MBMS data through the allocated radio resource.

The sending module 703 is specifically configured to allocate a time domain resource, a frequency domain resource, and a modulation and coding strategy MCS for the MBMS control channel according to a static mode.

The sending module 703 is specifically configured to allocate a time domain resource to the MBMS control channel according to a dynamic manner.

Further, in the above embodiment, the sending module 703 is specifically configured to determine a radio resource allocation manner of the MBMS service channel, where the radio resource allocation manner includes a static manner or a dynamic manner;

a sending module 703, configured to allocate radio resources to an MBMS service channel according to a radio resource allocation manner;

the sending module 703 is specifically configured to broadcast MBMS data on an MBMS bearer through the allocated radio resource.

The sending module 703 is specifically configured to allocate a time domain resource, a frequency domain resource, and a modulation and coding strategy MCS for an MBMS service channel according to a static mode.

The sending module 703 is specifically configured to allocate a time domain resource to the MBMS service channel according to a dynamic manner.

The DeNB shown in the embodiment of the present invention may execute the technical solution shown in the first embodiment of the method, and its implementation principle and beneficial effect are similar, which are not described herein again.

Fig. 9 is a schematic structural diagram of a RN according to a first embodiment of the present invention, and as shown in fig. 9, the RN may include:

an establishing module 901, configured to establish an MBMS control channel on a control plane Un-C of an interface between a donor base station DeNB and the donor base station DeNB;

the establishing module 901 is further configured to establish an MBMS bearer and an MBMS service channel on a user plane Un-U of an interface between the DeNB and the user plane Un-U; MBMS bearing and MBMS service channels are in one-to-one correspondence;

a receiving module 902, configured to receive control information of MBMS data broadcast by a DeNB through an MBMS control channel;

the receiving module 902 is further configured to receive, according to the control information, MBMS data on an MBMS bearer broadcast by the DeNB through an MBMS service channel.

The relay node RN according to the embodiment of the present invention may implement the technical solution shown in the second method embodiment, and the implementation principle and the beneficial effect are similar, which are not described herein again.

Fig. 10 is a schematic structural diagram of a MBMS data transmission system according to a first embodiment of the present invention, and please refer to fig. 10, where the MBMS data transmission system 10 includes:

the donor base station DeNB1001 in any of the embodiments described above, and the relay node RN1002 in any of the embodiments described above.

The MBMS data transmission system according to the embodiment of the present invention may implement the technical solutions according to any of the above method embodiments, and the implementation principle and the beneficial effects thereof are similar, and are not described herein again.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for transmitting Multimedia Broadcast Multicast Service (MBMS) data is characterized by comprising the following steps:

receiving MBMS data on the MBMS bearer sent by a multimedia broadcast multicast service gateway (MBMS GW);

broadcasting the control information of the MBMS data through the MBMS control channel, wherein the control information of the MBMS data is the configuration information of the MBMS service channel;

2. The method of claim 1, wherein before the MBMS control channel is established on a control plane Un-C of the interface with the relay node RN, the method further comprises:

3. The method of claim 1, wherein the broadcasting control information for the MBMS data over the MBMS control channel comprises:

broadcasting control information of the MBMS data through the allocated radio resources.

4. The method of claim 3, wherein the radio resource allocation is static;

5. The method of claim 3, wherein the radio resource allocation is dynamic;

6. The method of claim 1, wherein the broadcasting the MBMS data on the MBMS bearer over the MBMS traffic channel comprises:

7. The method of claim 6, wherein the radio resource allocation is static;

8. The method of claim 6, wherein the radio resource allocation is dynamic;

9. A method for transmitting Multimedia Broadcast Multicast Service (MBMS) data is characterized by comprising the following steps:

receiving control information of MBMS data broadcasted by the DeNB through the MBMS control channel, wherein the control information of the MBMS data is configuration information of the MBMS service channel;

10. A donor base station, DeNB, comprising:

the establishing module is used for establishing an MBMS control channel on a control surface Un-C of an interface between the relay node RN and the relay node RN;

a sending module, configured to broadcast control information of the MBMS data through the MBMS control channel, where the control information of the MBMS data is configuration information of the MBMS service channel;

11. The DeNB of claim 10, further comprising an acknowledgement module,

the receiving module is further configured to receive a session initiation request message sent by the MCE, where the session initiation request message is used to request that the MBMS data be sent to the DeNB;

12. The DeNB of claim 10,

the sending module is specifically configured to determine a radio resource allocation manner of the MBMS control channel, where the radio resource allocation manner includes a static manner or a dynamic manner;

13. The DeNB of claim 12,

the sending module is specifically configured to allocate a time domain resource, a frequency domain resource, and a modulation and coding strategy MCS to the MBMS control channel according to the static mode.

14. The DeNB of claim 12,

the sending module is specifically configured to allocate a time domain resource to the MBMS control channel according to the dynamic manner.

15. The DeNB of claim 10,

the sending module is specifically configured to determine a radio resource allocation manner of the MBMS service channel, where the radio resource allocation manner includes a static manner or a dynamic manner;

16. The DeNB of claim 15,

and the sending module is specifically configured to allocate a time domain resource, a frequency domain resource, and a modulation and coding strategy MCS to the MBMS service channel according to the static mode.

17. The DeNB of claim 15,

the sending module is specifically configured to allocate a time domain resource to the MBMS service channel according to the dynamic manner.

18. A Relay Node (RN), comprising:

a receiving module, configured to receive, through the MBMS control channel, control information of MBMS data broadcast by the DeNB, where the control information of MBMS data is configuration information of the MBMS service channel;

19. A MBMS data transmission system comprising the donor base station DeNB of any one of claims 10 to 17 and the relay node RN of claim 18.