CN113099388B

CN113099388B - Method and system for non-independently deployed 5G system to bear MBMS

Info

Publication number: CN113099388B
Application number: CN202010021580.8A
Authority: CN
Inventors: 魏立梅; 袁乃华; 范晨; 朱玉梅; 周志宏; 陈迎
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2022-06-24
Anticipated expiration: 2040-01-09
Also published as: CN113099388A

Abstract

The embodiment of the invention provides a method and a system for bearing an MBMS (multimedia broadcast multicast service) by a non-independently deployed 5G system. When receiving an MBMS session starting request, the MCE determines a cell which needs to broadcast the MBMS and belongs to an eNB and a cell which needs to broadcast the MBMS and belongs to an en-gNB connected with the eNB; the method comprises the steps that the MCE determines a first broadcast mode for broadcasting the MBMS in a cell belonging to the eNB and determines a second broadcast mode for broadcasting the MBMS in a cell of the en-gNB; broadcasting MBMS data in a cell belonging to an eNB based on a first broadcasting mode; and the en-gNB broadcasts the MBMS data in the cell belonging to the en-gNB based on the second broadcast mode. The MBMS is loaded through the 5G NR by adding the function to the related network element in the structure of the MBMS loaded by the LTE system in the 3GPP protocol.

Description

Method and system for non-independently deployed 5G system to bear MBMS

Technical Field

The present invention belongs to the technical field of mobile communication, particularly to a method and a system for a non-independently deployed 5G system to bear Multimedia Broadcast Multicast Service (MBMS).

Background

MBMS is a typical service supported by the LTE system in 3GPP protocol, and the service can be transmitted to a specific user terminal (UE) through a unicast Bearer, and can also be broadcast (UE) in a cell through an MBMS Bearer (MBMS Bearer). Fig. 1 is an architecture diagram of MBMS in LTE system in 3GPP protocol. The PLMN is a home PLMN (H-PLMN) when the UE is in a non-roaming scenario; when the UE is in a roaming scenario, the PLMN is a visited PLMN (V-PLMN). The E-UTRAN consists of a multi-cell Multicast Coordination Entity (MCE) and an evolved base station (eNB).

A conventional MBMS transmission method will be described with reference to fig. 1 as an example.

The MBMS establishment procedure is as follows:

a Group communication system application server (GCS AS) sends an MBMS Bearer activation Request (Activate MBMS Bearer Request) to the BM-SC through an MB2-C interface, where the message carries a session attribute of the MBMS. The session attributes include: TMGI, QOS information, MBMS broadcast area and start time of MBMS, wherein the MBMS broadcast area is defined by an MBMS area ID list and/or a cell ID list. The message triggers BM-SC to initiate a session start request process, in which BM-SC triggers a corresponding network element to allocate resources for MBMS bearer.

Specifically, in the Session Start Request process, the BM-SC sends a Session Start Request (Session Start Request) to the MBMS-GW, where the message carries the Session attribute of the MBMS. MBMS-GW establishes MBMS bearing context for MBMS and distributes transmission network IP multicast address and C-TEID for the service. MBMS-GW sends session start request to corresponding MME, and the message carries session attribute. Newly adding in session attributes: the TNL information. The information includes: the transport network IP multicast address, the C-TEID and the IP address of the multicast source. Before sending this message, the MBMS-GW feeds back a Session Start Response (Session Start Response) to the BM-SC.

After receiving the Response, the BM-SC feeds back an Activate MBMS Bearer Response (Activate MBMS Bearer Response) to the GCS AS. The message carries the information of the IP address, the port number and the like of the BM-SC. The BM-SC is then ready to receive MBME traffic data from the GCS AS over the MB2-U interface.

The GCS AS, after receiving the activate MBMS bearer response, will prepare to send MBMS data to the BM-SC over the MB2-U interface. After receiving the MBMS conversation starting request, the MME establishes an MBMS bearing context for the MBMS according to the conversation attribute in the message, determines each MCE corresponding to the MBMS broadcast area in the conversation attribute, and sends the conversation starting request to each MCE. The message carries the session attributes. The MCE establishes MBMS bearing context for the MBMS according to the session attribute of the MBMS in the message and determines the MBMS sending mode of each service area or cell corresponding to the MBMS broadcast area.

When the MCE determines that the service is broadcasted in an MBMS area or an area formed by a plurality of cells in an MBSFN mode, the MCE allocates radio resources to the MBMS. The MCE sends a session start request to the corresponding eNB. The message carries the MBMS session attributes. The session attributes include: TMGI and TNL information, etc. When the MCE determines to transmit the MBMS in the corresponding cell in an SC-PTM mode, the message also carries SC-PTM information, and the information comprises: QOS information of MBMS and a cell ID list, wherein the cell ID list is a set of cells which transmit MBMS in an SC-PTM mode in the cells belonging to the corresponding eNB. After receiving the session start request, the eNB joins the corresponding IP multicast distribution through the M1 interface according to the TNL information in the session attributes, and prepares to receive the data of the MBMS from the MBMS-GW. And when the message contains SC-PTM information, the eNB allocates wireless resources to the MBMS according to the QOS information of the MBMS in each cell corresponding to the cell ID list. In general, radio resources allocated to an MBMS by an eNB in different cells are not the same.

When the MCE determines that the service is broadcasted in the MBSFN manner in one MBMS area or an area formed by several cells, the MCE also sends MBMS Scheduling information (MBMS Scheduling information) to the corresponding eNB. The message includes MBSFN area configuration information. The eNB can determine the configuration information of the control plane resource and the user plane resource required by the MBMS transmission in the MBSFN mode according to the MBSFN area configuration information. And the eNB broadcasts the MBSFN area control information and the data of the MBMS in the corresponding cell through the corresponding control plane resource and the corresponding user plane resource.

After the MCE receives the session start request sent by the MME, the MCE feeds back a session start response to the MME before or during the processing performed by the MCE and the eNB. And after receiving the response message fed back by the MCE, the MME feeds back a session start response to the MBMS-GW. The MBMS-GW starts IP multicast distribution of MBMS data after receiving the response.

After the above processing procedure, when the time of MBMS transmission is up, the GCS AS sends MBMS data to BM-SC, BM-SC forwards the data to MBMS-GW, and MBMS-GW sends the data to corresponding eNB in IP multicast distribution mode. In the MBSFN mode, the eNB broadcasts the data of the MBMS in a corresponding cell through the radio resources uniformly distributed by the MCE; in the SC-PTM mode, the eNB broadcasts the data of the MBMS in the corresponding cell through the radio resource allocated by the eNB.

With the widespread use of the LTE system, the era of wireless internet has been opened. Wireless internet has developed more diverse demands for wireless networks, including not only higher system throughput, but also lower transmission delay, higher reliability, and a greater number of connected users. To meet these demands, 5G systems have come into force. The evolution of the LTE system to the 5G system in the 3GPP protocol is divided into two phases: non-independently deployed 5G systems and independently deployed 5G systems. According to the evolution process of the core network, the non-independently deployed 5G system is divided into: 5G systems with enhanced EPC and 5G systems with 5 GC. In the scenario of employing enhanced EPC in a non-independently deployed 5G system, the architecture of the 5G system is as shown in fig. 2. In the scene, the connection of the LTE system radio access network E-UTRAN and the 5G system radio access Network (NR) in an EN-DC mode is supported, and the service can be provided for the UE through the E-UTRAN and the 5G NR at the same time.

FIG. 2 is a diagram of a 5G system architecture for non-standalone deployment based on enhanced EPC and EN-DC.

In fig. 2, the MME and the S-GW are network elements included in the EPC, and the EPC includes another network element P-GW that is in-line with the S-GW and out-line with an external data network. The P-GW is not shown in fig. 2 since it has no direct channel with the eNB and the en-gbb. In fig. 2, eNB is connected as E-utran with EPC through S1 interface and en-gbb through X2 interface. The en-gNB as a 5G RAN can be connected with the EPC through an S1-U interface, and the en-gNB is connected with the EPC through an X2-U interface. In fig. 2, when the UE has an EN-DC function, the UE can be provided with a service through the eNB and the EN-gbb at the same time.

However, in the above non-independently deployed 5G system, the en-gbb does not support provision of MBMS to UEs within a cell.

Disclosure of Invention

The embodiment of the invention provides a method and a system for a non-independently deployed 5G system to bear MBMS.

The technical scheme of the embodiment of the invention is as follows:

a method for a non-independently deployed 5G system to carry MBMS, comprising:

when a multi-cell Multicast Coordination Entity (MCE) receives a Multimedia Broadcast Multicast Service (MBMS) from a Mobile Management Entity (MME), namely a session start request, determining a cell which needs to broadcast the MBMS and belongs to an evolved node B (eNB) and a cell which needs to broadcast the MBMS and belongs to an en-gNB connected with the eNB;

the MCE determines a first broadcast mode for broadcasting the MBMS in the cell belonging to the eNB and determines a second broadcast mode for broadcasting the MBMS in the cell of the en-gNB;

the eNB receives first MBMS configuration information corresponding to a first broadcast mode from the MCE, and the en-gNB receives second MBMS configuration information corresponding to a second broadcast mode;

the eNB receives MBMS data from an MBMS-GW based on the first MBMS configuration information, and broadcasts the MBMS data in a cell belonging to the eNB based on the first broadcast mode; and the en-gNB broadcasts the MBMS data in the cell belonging to the en-gNB based on a second broadcast mode.

In one embodiment, the method further comprises: configuring a logical interface M1 and a logical interface M2 on an X2 interface between the eNB and the en-gNB;

wherein the en-gNB receiving second MBMS configuration information corresponding to a second broadcast mode comprises: the eNB receives the second MBMS configuration information through an M2 interface between the eNB and the MCE; the eNB sends the second MBMS configuration information to the en-gNB based on the logical interface M2 on an X2 interface;

wherein the eNB receiving MBMS data from an MBMS-GW based on the first MBMS configuration information comprises: extracting a multicast address in the first MBMS configuration information; receiving the MBMS data from the MBMS-GW through an M1 interface with the MBMS-GW according to the multicast address;

the method further comprises the following steps: the eNB sends the MBMS data to the en-gNB based on the logical interface M1 on an X2 interface.

In one embodiment, the method further comprises: an newly added M2 interface is arranged between the en-gNB and the MCE, and an newly added M1 interface is arranged between the en-gNB and the MBMS-GW;

wherein the en-gNB receiving second MBMS configuration information corresponding to a second broadcast mode comprises: the en-gNB receives the second MBMS configuration information through the newly added M2 interface between the en-gNB and the MCE;

the method further comprises the following steps: the en-gNB extracts a multicast address in the second MBMS configuration information; and receiving the MBMS data through a newly added M1 interface between the MBMS-GW according to the multicast address.

In one embodiment, the method further comprises: configuring a logic interface M1 on an X2 interface between the eNB and the en-gNB, and setting a newly added M2 interface between the en-gNB and the MCE;

wherein the en-gNB receiving second MBMS configuration information corresponding to a second broadcast mode comprises: the en-gNB receives the second MBMS configuration information from the MCE through the newly added M2 interface between the en-gNB and the MCE;

wherein the eNB receiving MBMS data from an MBMS-GW based on the first MBMS configuration information comprises: extracting a multicast address in the first MBMS configuration information; receiving the MBMS data through an M1 interface between the MBMS-GW according to the multicast address;

In one embodiment, the method further comprises: configuring a logic interface M2 on an X2 interface between the eNB and the en-gNB, and setting a newly added M1 interface between the en-gNB and the MBMS-GW;

In one embodiment, the second broadcasting scheme includes:

only a multimedia broadcast multicast single frequency network (MBSFN) mode is adopted;

only adopting a single-cell point-to-multipoint SC-PTM mode;

and adopting an MBSFN mode or an SC-PTM mode.

In one embodiment, the SC-PTM scheme includes an SC-PTM scheme of scheme 1 and an SC-PTM scheme of scheme 2, wherein:

in the SC-PTM scheme of scheme 1: in a cell of the en-gNB, the MCE determines a cell ID list for broadcasting the MBMS in an SC-PTM mode;

in the SC-PTM scheme of scheme 2: in a cell of the en-gNB, the MCE determines a cell ID list for broadcasting the MBMS in an SC-PTM mode and distributes an NR parameter for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID to a current MBMS and determines configuration information of a bandwidth part (BWP) broadcasting the MBMS, wherein the configuration information of the BWP includes: the time-frequency position, the subcarrier interval and the CP type of BWP broadcasting MBMS, the search space corresponding to a physical downlink control channel PDCCH dispatching MBMS and the configuration information of a control resource set.

In one embodiment, when the second broadcast mode includes an MBSFN mode, the second MBMS configuration information includes: a cell ID list for broadcasting MBMS in a MBSFN manner in cells belonging to the en-gNB; wireless resource configuration information uniformly allocated for the MBMS; session attributes of MBMS in an MBMS session start request;

when the second broadcast mode includes the SC-PTM mode of mode 1, the second MBMS configuration information includes: broadcasting a cell ID list of MBMS in an SC-PTM manner in a cell belonging to an en-gNB; session attributes of MBMS in an MBMS session start request;

when the second broadcast mode includes the SC-PTM mode of mode 2, the second MBMS configuration information includes: broadcasting a cell ID list of MBMS in an SC-PTM manner in a cell belonging to an en-gNB; session attributes of MBMS in an MBMS session start request; NR parameters allocated for MBMS, the NR parameters comprising: the MCE allocates a unique group ID for the MBMS; and the MCE determines the configuration information of the BWP broadcasting the MBMS.

A system for a non-independently deployed 5G system to carry MBMS, comprising an MCE, an eNB, and an en-gNB connected to the eNB, wherein:

the MCE is used for determining a cell which needs to broadcast the MBMS and belongs to the eNB and a cell which needs to broadcast the MBMS and belongs to the en-gNB when an MBMS session starting request is received from an MME; determining a first broadcast mode for broadcasting the MBMS in the cell belonging to the eNB and determining a second broadcast mode for broadcasting the MBMS in the cell of the en-gNB;

the eNB is used for receiving first MBMS configuration information corresponding to a first broadcast mode from the MCE;

the en-gNB is configured to receive second MBMS configuration information corresponding to a second broadcast mode;

the eNB is further used for receiving MBMS data from an MBMS-GW based on the first MBMS configuration information, and broadcasting the MBMS data in a cell belonging to the eNB based on the first broadcasting mode;

the en-gNB is further configured to broadcast the MBMS data in the cell belonging to the en-gNB based on a second broadcast mode.

In one embodiment, a logical interface M1 and a logical interface M2 are configured on the X2 interface between the eNB and the en-gbb;

the eNB is configured to receive the second MBMS configuration information through an M2 interface with an MCE, and send the second MBMS configuration information to the en-gbb based on the logical interface M2 on an X2 interface; extracting a multicast address in the first MBMS configuration information; receiving the MBMS data from the MBMS-GW through an M1 interface with the MBMS-GW according to the multicast address; transmitting the MBMS data to the en-gNB based on the logical interface M1 on an X2 interface.

In one embodiment, a newly added M2 interface is arranged between the en-gNB and the MCE, and a newly added M1 interface is arranged between the en-gNB and the MBMS-GW;

the en-gNB is used for receiving the second MBMS configuration information through the newly added M2 interface between the MCE and the user equipment; extracting a multicast address in the second MBMS configuration information; and receiving the MBMS data through an added M1 interface between the MBMS-GW and the MBMS-GW according to the multicast address.

In one embodiment, a logical interface M1 is configured on an X2 interface between the eNB and the en-gNB, and a newly added M2 interface is arranged between the en-gNB and the MCE;

the en-gNB is used for receiving the second MBMS configuration information from the MCE through the newly added M2 interface between the en-gNB and the MCE;

the eNB is used for extracting a multicast address in the first MBMS configuration information; receiving the MBMS data through an M1 interface between the MBMS-GW according to the multicast address; transmitting the MBMS data to the en-gNB based on the logical interface M1 on an X2 interface.

In one embodiment, a logical interface M2 is configured on an X2 interface between the eNB and the en-gNB, and a newly added M1 interface is arranged between the en-gNB and the MBMS-GW;

wherein the eNB is configured to receive the second MBMS configuration information through an M2 interface with an MCE; transmitting the second MBMS configuration information to the en-gNB based on the logical interface M2 on an X2 interface;

wherein the en-gNB is configured to extract a multicast address in the second MBMS configuration information; and receiving the MBMS data through a newly added M1 interface between the MBMS-GW according to the multicast address.

In one embodiment, the second broadcasting scheme includes:

only adopting a multimedia broadcast multicast single frequency network MBSFN mode;

only adopting a single-cell point-to-multipoint SC-PTM mode;

and adopting an MBSFN mode or an SC-PTM mode.

in the SC-PTM scheme of scheme 2: in a cell of the en-gNB, the MCE determines a cell ID list for broadcasting the MBMS in an SC-PTM mode and distributes an NR parameter for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID for the current MBMS and determines configuration information of a BWP broadcasting the MBMS, wherein the configuration information of the BWP comprises: the time-frequency position, the subcarrier interval and the CP type of BWP broadcasting MBMS, the search space corresponding to a physical downlink control channel PDCCH dispatching MBMS and the configuration information of a control resource set.

when the second broadcast mode includes the SC-PTM mode of mode 1, the second MBMS configuration information includes: broadcasting a cell ID list of MBMS in a SC-PTM manner in a cell belonging to the en-gNB; session attributes of MBMS in an MBMS session start request;

when the second broadcast mode includes the SC-PTM mode of mode 2, the second MBMS configuration information includes: broadcasting a cell ID list of MBMS in an SC-PTM manner in a cell belonging to an en-gNB; session attributes of MBMS in an MBMS session start request; NR parameters allocated for MBMS, the NR parameters including: the MCE allocates a unique group ID for the MBMS; and the MCE determines the configuration information of the BWP broadcasting the MBMS.

An apparatus for a non-independently deployed 5G system to carry MBMS, comprising a processor and a memory;

the memory has stored therein an application executable by the processor for causing the processor to perform a method of non-independently deployed 5G system bearer MBMS as described in any one of the above.

A computer readable storage medium having stored therein computer readable instructions for performing the method of non-independently deployed 5G system bearer MBMS as recited in any one of the above.

As can be seen from the foregoing technical solutions, in the embodiment of the present invention, when an MCE receives an MBMS session start request from an MME, it determines a cell that needs to broadcast the MBMS and belongs to an eNB and a cell that needs to broadcast the MBMS and belongs to an en-gNB connected to the eNB; the method comprises the steps that the MCE determines a first broadcast mode for broadcasting the MBMS in a cell belonging to the eNB and determines a second broadcast mode for broadcasting the MBMS in a cell of the en-gNB; the eNB receives first MBMS configuration information corresponding to a first broadcast mode from the MCE, and the en-gNB receives second MBMS configuration information corresponding to a second broadcast mode; the eNB receives MBMS data from the MBMS-GW based on the first MBMS configuration information, and broadcasts the MBMS data in a cell belonging to the eNB based on a first broadcast mode; and the en-gNB broadcasts the MBMS data in the cell belonging to the en-gNB based on a second broadcast mode. Therefore, the embodiment of the invention realizes the MBMS bearing through the 5G NR by adding the function to the related network element in the structure of the LTE system bearing the MBMS in the 3GPP protocol.

Moreover, the MBMS bearing framework of the embodiment of the invention has various embodiments and can be flexibly applied.

Drawings

Fig. 1 is an architecture diagram of MBMS in LTE system in 3GPP protocol.

Fig. 3 is a flowchart of a method for a non-independently deployed 5G system to carry MBMS according to the present invention.

Fig. 4 is a system structure diagram of a non-independently deployed 5G system carrying MBMS according to a first embodiment of the present invention.

Fig. 5 is a system structure diagram of a non-independently deployed 5G system carrying MBMS according to a second embodiment of the present invention.

Fig. 6 is a system structure diagram of a non-independently deployed 5G system carrying MBMS according to a third embodiment of the present invention.

Fig. 7 is a system structure diagram of a non-independently deployed 5G system carrying MBMS according to a fourth embodiment of the present invention.

Fig. 8 is a structural diagram of an apparatus for carrying MBMS in a non-independently deployed 5G system according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings.

For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "comprising" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.

The applicant found that: in a non-standalone deployed 5G system based on enhanced EPC and EN-DC, the EN-gbb does not support provision of MBMS to UEs within a cell. Because the 5G system supports various parameter sets, the bandwidth is far above the LTE system, and in order to provide more MBMS and more effectively utilize the large bandwidth of the 5G system in the early development stage of the 5G system, the embodiment of the invention provides a method and a system for bearing the MBMS by NR in the non-independently deployed 5G system based on enhanced EPC and EN-DC, so that the MBMS is provided by the 5G NR under the non-independently deployed scene based on the enhanced EPC and EN-DC.

In the embodiment of the invention, the MBMS is carried through the 5G NR by adding the function on the related network element.

To broadcast MBMS in a non-independently deployed 5G system through enhanced EPC and en-gNB in a 5G NR cell, fig. 3 is a flowchart of a method for a non-independently deployed 5G system to carry MBMS according to the present invention. As shown in fig. 3, the method includes:

step 301: when the MCE receives an MBMS session starting request from the MME, the cells which need to broadcast the MBMS and belong to the eNB and the cells which need to broadcast the MBMS and belong to the en-gNB connected with the eNB are determined.

Step 302: the MCE determines a first broadcast mode for broadcasting the MBMS in a cell belonging to the eNB and determines a second broadcast mode for broadcasting the MBMS in a cell of the en-gNB.

Here, the first broadcast scheme may be an MBSFN scheme or an SC-PTM scheme. The second broadcasting mode is as follows: (1) only adopting MBSFN mode; (2) only adopting SC-PTM mode; (3) and adopting MBSFN mode or SC-PTM mode.

Step 303: the eNB receives first MBMS configuration information corresponding to a first broadcast mode from the MCE, and the en-gNB receives second MBMS configuration information corresponding to a second broadcast mode.

Step 304: the eNB receives MBMS data from the MBMS-GW based on the first MBMS configuration information, and broadcasts the MBMS data in a cell belonging to the eNB based on a first broadcast mode; and the en-gNB broadcasts the MBMS data in the cell belonging to the en-gNB based on the second broadcast mode.

In one embodiment, logical interface M1 and logical interface M2 are configured on the X2 interface between the eNB and the en-gbb; wherein the receiving, by the en-gbb, the second MBMS configuration information corresponding to the second broadcast mode in step 303 includes: the eNB receives the second MBMS configuration information through an M2 interface between the eNB and the MCE; the eNB sends the second MBMS configuration information to the en-gNB based on the logical interface M2 on an X2 interface; wherein the receiving, by the eNB from the MBMS-GW based on the first MBMS configuration information in step 304, the MBMS data includes: extracting a multicast address in the first MBMS configuration information; receiving the MBMS data from the MBMS-GW through an M1 interface with the MBMS-GW according to the multicast address; the method further comprises the following steps: the eNB sends the MBMS data to the en-gNB based on the logical interface M1 on an X2 interface.

It can be seen that in the above embodiments, the logical interface M1 and the logical interface M2 are configured on the X2 interface between the eNB and the en-gNB, and for the en-gNB, the eNB proxies the functions of the M2 interface and the M1 interface through the X2 interface.

In one embodiment, the method further comprises: setting a newly added M2 interface between the en-gNB and the MCE, and setting a newly added M1 interface between the en-gNB and the MBMS-GW; wherein the receiving, by the en-gbb, the second MBMS configuration information corresponding to the second broadcast mode in step 303 includes: and the en-gNB receives the second MBMS configuration information through the newly added M2 interface between the en-gNB and the MCE. The method further comprises the following steps: the en-gNB extracts the multicast address in the second MBMS configuration information; and receiving the MBMS data through an added M1 interface between the MBMS-GW and the MBMS-GW according to the multicast address.

It can be seen that, in the above embodiment, an additional M2 interface is set between the en-gNB and the MCE, and an additional M1 interface is set between the en-gNB and the MBMS-GW.

In one embodiment, the method further comprises: configuring a logic interface M1 on an X2 interface between the eNB and the en-gNB, and setting a newly added M2 interface between the en-gNB and the MCE; the step 303 of receiving, by the en-gbb, second MBMS configuration information corresponding to the second broadcast mode includes: the en-gNB receives the second MBMS configuration information from the MCE through the newly added M2 interface between the en-gNB and the MCE; the receiving, by the eNB from the MBMS-GW based on the first MBMS configuration information in step 304, MBMS data includes: extracting a multicast address in the first MBMS configuration information; and receiving the MBMS data through an M1 interface between the MBMS-GW according to the multicast address. Furthermore, the eNB also transmits the MBMS data to the en-gbb based on the logical interface M1 on the X2 interface.

It can be seen that, in the above embodiment, the logical interface M1 is configured on the X2 interface between the eNB and the en-gNB, and the new M2 interface is set between the en-gNB and the MCE.

In one embodiment, the method further comprises: configuring a logic interface M2 on an X2 interface between the eNB and the en-gNB, and setting a newly added M1 interface between the en-gNB and the MBMS-GW; the step 303 of receiving, by the en-gbb, second MBMS configuration information corresponding to the second broadcast mode includes: the eNB receives the second MBMS configuration information through an M2 interface between the eNB and the MCE; the eNB sends the second MBMS configuration information to the en-gbb based on the logical interface M2 on an X2 interface. The en-gNB extracts the multicast address in the second MBMS configuration information; and receiving the MBMS data through a newly added M1 interface between the MBMS-GW according to the multicast address.

It can be seen that, in the above embodiment, a logical interface M2 is configured on the X2 interface between the eNB and the en-gNB, and an additional M1 interface is set between the en-gNB and the MBMS-GW.

Preferably, the SC-PTM scheme includes an SC-PTM scheme of scheme 1 and an SC-PTM scheme of scheme 2, wherein: in the SC-PTM scheme of scheme 1: in a cell of the en-gNB, the MCE determines a cell ID list for broadcasting the MBMS in an SC-PTM mode; in the SC-PTM scheme of scheme 2: in a cell of the en-gNB, the MCE determines a cell ID list for broadcasting MBMS in an SC-PTM mode and distributes an NR parameter for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID for the current MBMS and determines configuration information of a BWP broadcasting the MBMS, wherein the configuration information of the BWP comprises: the time-frequency position, the subcarrier interval and the CP type of BWP broadcasting MBMS, the search space corresponding to a physical downlink control channel PDCCH dispatching MBMS and the configuration information of a control resource set. The method comprises the following specific steps:

the MCE determines a group ID (G-RNTI) used by the current MBMS: the unique group ID is used for identifying different MBMS in NR cells, and for each cell which broadcasts the MBMS in an SC-PTM mode in the cell of the en-gNB, the scheduling information of the MBMS is broadcasted to UE through a PDCCH scrambled by the group ID through CRC.

The MCE determines configuration information of a BWP broadcasting a current MBMS, wherein the configuration information of the BWP comprises: the time-frequency position of BWP (Bandwidth Part, Bandwidth segment) broadcasting the current MBMS, the subcarrier spacing, the Cyclic Prefix (CP) type, the search space corresponding to the PDCCH scheduling the MBMS and the configuration information of the control-resource set (core), etc.

In the process that the MCE determines the configuration information of the BWP broadcasting the current MBMS, the MCE determines the BWP configuration information for all the cells uniformly, and the BWP configuration information is suitable for each cell broadcasting the current MBMS in an SC-PTM mode.

Of course, the MCE may also determine the BWP configuration information for each cell. When the MCE determines the BWP configuration information for each cell, the BWP broadcasting the current MBMS in each cell is usually different from each other.

In one embodiment, when the second broadcast mode is an MBSFN mode, the second MBMS configuration information includes: a cell ID list for broadcasting MBMS in a MBSFN manner in cells belonging to the en-gNB; wireless resource configuration information uniformly allocated for the MBMS; MBMS session attributes in an MBMS session start request, etc.

In one embodiment, when the second broadcast mode is the SC-PTM mode of mode 1, the second MBMS configuration information includes: broadcasting a cell ID list of MBMS in an SC-PTM manner in a cell belonging to an en-gNB; MBMS session attributes in an MBMS session start request; and so on.

In one embodiment, when the second broadcast mode is the SC-PTM mode of mode 2, the second MBMS configuration information includes: broadcasting a cell ID list of MBMS in an SC-PTM manner in a cell belonging to an en-gNB; MBMS session attributes in an MBMS session start request; NR parameters allocated for MBMS: the NR parameters include: the MCE distributes a unique group ID for the MBMS; configuration information of BWP broadcasting MBMS determined by MCE, and so on.

The present invention will be described with reference to specific examples.

The first embodiment is as follows:

In fig. 4, logical interface M1 and logical interface M2 are configured on the X2 interface between the eNB and the en-gbb. That is, for the en-gbb, the eNB proxies the functions of the M2 interface and the M1 interface through the X2 interface, which are embodied in:

in an aspect, the eNB receives configuration information of an MBMS of each cell from the MCE through an M2 interface with the MCE, where each cell may include: a cell belonging to the eNB and a cell belonging to the en-gbb. The eNB needs to extract configuration information of the MBMS of each cell belonging to the en-gNB, and transmit the configuration information to the en-gNB through a logical interface M2 on an X2 interface with the en-gNB. During this process, for the en-gbb, the eNB functions as an MCE, and there is a logical interface M2 on the X2 interface, through which the eNB forwards relevant information from the MCE to the en-gbb via the logical interface M2.

On the other hand, the eNB extracts the IP multicast address of the current MBMS from the received MBMS configuration information of each cell, joins IP multicast distribution of the MBMS through an M1 interface with the MBMS-GW based on the IP multicast address, and receives data of the current MBMS from the MBMS-GW. When there is a cell broadcasting the current MBMS service in the cell of the en-gNB, the eNB forwards the data of the current MBMS received from the M1 interface to the en-gNB through the logical interface M1 on the X2 interface. In the process, for the en-gNB, the eNB functions as an MBMS-GW, and there is a logical interface M1 on the X2 interface, through which logical interface M1 the eNB forwards the data of the corresponding MBMS from the MBMS-GW to the en-gNB.

When the MCE receives an MBMS SESSION START request (SESSION START request) from the MME, the MCE determines the cells that need to broadcast the MBMS among the cells it controls, and identifies from these cells the cells belonging to the eNB and the cells belonging to the en-gNB connected to the eNB.

For each cell belonging to the eNB, the MCE determines the manner of broadcasting the MBMS in the cell as follows: MBSFN mode or SC-PTM mode. The specific treatment comprises the following steps: (1) when the MCE determines that the corresponding MBMS are broadcasted in the cells belonging to the eNB in an MBSFN mode, the MCE uniformly allocates radio resources for the corresponding MBMS in the cells, and the cells broadcast the corresponding MBMS by adopting the uniformly allocated radio resources. (2) And when the MCE determines that the corresponding MBMS are broadcasted in a SC-PTM mode in a plurality of cells belonging to the eNB, the MCE determines the cell ID lists of the cells.

For cells belonging to an en-gNB connected to the eNB, the MCE determines the manner in which the MBMS are broadcast in these cells. In the embodiment of the present invention, for MBMS broadcast in the cell of the en-gbb, it can be specified explicitly in the 3GPP protocol as: and broadcasting the MBMS only by adopting an MBSFN mode or broadcasting the MBMS only by adopting an SC-PTM mode. Optionally, it may also be explicitly specified in the 3GPP protocol: and broadcasting the MBMS by adopting an MBSFN mode or broadcasting the MBMS by adopting an SC-PTM mode. Wherein: when the 3GPP protocol specifies that the MBMS has only one broadcast mode (MBSFN mode or SC-PTM mode), the MCE directly selects the mode to broadcast each MBMS. When it is explicitly specified in the 3GPP protocol that the MBMS can be broadcasted in the MBSFN manner or in the SC-PTM manner, the MCE determines, among the cells belonging to the en-gbb, the respective cells that broadcast the MBMS in the MBSFN manner, and the respective cells that broadcast the MBMS in the SC-PTM manner.

When the MCE determines that the corresponding MBMS are broadcasted in the cells belonging to the en-gNB in an MBSFN mode, the MCE uniformly allocates radio resources for the corresponding MBMS in the cells, and each cell adopts the uniformly allocated radio resources to broadcast the corresponding MBMS. In general, the cells are geographically adjacent cells, the cells form an MBSFN area, when the UE moves in the area, signals of corresponding MBMS received by the UE from the cells in the area are multipath components of the same signal, and the UE can obtain diversity gain through multipath combining.

When the MCE determines that the corresponding MBMS is broadcast in the SC-PTM manner in several cells belonging to the en-gNB, the MCE may adopt one of the following two processing manners:

the first method is as follows: the MCE determines a cell ID list of a cell broadcasting the MBMS in the SC-PTM manner among the cells of the en-gNB.

The second method comprises the following steps: in the cell of the en-gNB, the MCE determines a cell ID list of a cell broadcasting the MBMS in an SC-PTM mode and uniformly allocates the following NR parameters for the MBMS: (1) unique group ID assigned to the corresponding MBMS: the unique group ID is used to identify different MBMS in NR cells, and at the same time, in each cell broadcasting MBMS in SC-PTM, scheduling information of MBMS is broadcast to UEs through PDCCH scrambled with the group ID by CRC. (2) And determining: configuration information of BWP broadcasting MBMS, wherein the configuration information includes: the time-frequency position, subcarrier interval and CP type of BWP broadcasting MBMS; the search space corresponding to the PDCCH for scheduling the MBMS and the configuration information of the control resource set, and so on.

Also, the MCE may send the following information to the eNB through the M2 interface with the eNB:

(1) a cell ID list of a cell that broadcasts an MBMS in an MBSFN manner among cells belonging to an eNB; configuration information of radio resources uniformly allocated for the corresponding MBMS; and MBMS conversation attribute in MBMS conversation start request;

(2) a cell ID list of a cell broadcasting MBMS in an SC-PTM manner in a cell belonging to the eNB; and session attributes of corresponding MBMS in the MBMS session starting request received by the MCE;

(3) a cell ID list of a cell broadcasting MBMS in an MBSFN manner among cells belonging to the en-gNB; configuration information of radio resources uniformly allocated for the corresponding MBMS; and session attributes of the MBMS in the MBMS session start request;

(4) a cell ID list of a cell broadcasting MBMS in an SC-PTM manner in a cell belonging to the en-gNB; and session attributes of corresponding MBMS in the MBMS session starting request received by the MCE;

(5) and when the MCE adopts the processing specified in the second mode for each cell which broadcasts the corresponding MBMS in the SC-PTM mode in the cell of the en-gNB, the related NR parameters distributed by the MCE for the corresponding MBMS are required to be sent to the eNB through an M2 interface.

Furthermore, after receiving the above information sent by the MCE through the M2 interface, the eNB may perform the following processes:

(1) according to the MBMS conversation attribute in the MBMS conversation starting request, adding corresponding IP multicast distribution through an M1 interface, and receiving MBMS data from the MBMS-GW;

(2) and broadcasting the corresponding MBMS in the corresponding cell in an MBSFN mode or an SC-PTM mode according to the information related to the cell received from the MCE in the cell belonging to the cell: broadcasting MBMS data;

(3) the eNB forwards the following information to the en-gNB over logical interface M2 on the X2 interface: a cell ID list of a cell broadcasting MBMS in a MBSFN manner in a cell belonging to an en-gNB and configuration information of radio resources uniformly allocated for the corresponding MBMS; a cell ID list of a cell broadcasting the MBMS in an SC-PTM mode in a cell belonging to the en-gNB and session attributes of corresponding MBMS in an MBMS session starting request received by the MCE; when the MCE adopts the processing specified in the second mode for each cell broadcasting the corresponding MBMS in the SC-PTM mode in the cell of the en-gNB, it is further required to send the related NR parameter allocated by the MCE for the corresponding MBMS to the eNB through the logical interface M2 interface on the X2 interface;

(4) the eNB forwards the MBMS data received from the M1 interface to the en-gbb via the logical interface M1 on the X2 interface.

The eNB broadcasts the corresponding MBMS in the MBSFN mode or SC-PTM mode in the cell belonging to the eNB as the processing mode supported by the current 3GPP protocol.

The en-gNB broadcasts the MBMS in the MBSFN mode or the SC-PTM mode in the corresponding cell according to the information received from the logical interface M2 on the X2 interface: MBMS data received from logical interface M1 on the X2 interface is broadcast. The specific treatment comprises the following steps:

(1) broadcasting the MBMS in each cell which broadcasts the MBMS in an MBSFN mode according to the radio resources uniformly distributed by the MCE;

(2) in a cell broadcasting the MBMS in an SC-PTM mode, allocating wireless resources for the corresponding MBMS according to the QOS parameters of the session in the session attribute of the corresponding MBMS in the MBMS session starting request, and broadcasting the corresponding MBMS through the allocated wireless resources;

(3) and when the MCE adopts the processing specified in the mode two for each cell which broadcasts the corresponding MBMS in the SC-PTM mode in the cell of the en-gNB, when the wireless resources are allocated for the corresponding MBMS, the wireless resources are required to be allocated to the MBMS based on the NR parameters allocated to the corresponding MBMS by the MCE. Namely: directly adopting the group ID distributed by the MCE as the group ID of the MBMS at an empty port, determining the BWP of the MBMS broadcast in the cell according to the BWP configuration information determined by the MCE, and distributing wireless resources to the MBMS in the corresponding BWP according to the QOS parameters of the session in the session attribute;

(4) and the en-gNB directly receives the MBMS data forwarded by the eNB through a logical interface M1 on an X2 interface.

In the method and the system for providing the MBMS in the NR cell through the en-gNB, the eNB proxies the functions of the M2 and the M1 at an X2 interface connected with the en-gNB, and the en-gNB realizes the MBMS broadcast in the NR according to the M2 interface configuration information forwarded by the eNB and the MBMS data on the M1 interface.

For fig. 4, the following is further illustrated:

(1) when the UE is in a non-roaming scene, the PLMN is an H-PLMN; when the UE is in a roaming scenario, the PLMN is a V-PLMN.

(2) In fig. 4, other types of servers than GCS AS are further introduced in the application domain (application domain). The BM-SC is connected with other types of servers through an xMB interface to provide service data broadcasting function for other types of servers, thereby effectively expanding the application range of eNB and NR serving as MBMS broadcast pipelines. For example, other types of servers may be Vehicle to electronic (V2X) servers.

(3) Meanwhile, xMB interface is introduced between GCS AS and BM-SC, so that GCS AS can access MBMS broadcast service provided by BM-SC through xMB interface. The xMB interface provides more powerful security functions than the MB2 interface. Such as: the xMB interface supports mutual authentication between network elements.

(4) In fig. 4, for the en-gbb, the eNB proxies logical interface M2 and logical interface M1 through X2 interface. In an aspect, an eNB receives configuration information for an MBMS from an MCE through an M2 interface with the MCE. The configuration information includes each cell broadcasting the MBMS, and each corresponding cell is divided into: a cell belonging to the eNB and a cell belonging to the en-gbb. The eNB needs to extract configuration information of MBMS of each cell belonging to the en-gNB and send the information to the en-gNB through an X2 interface with the en-gNB. During this process, for the en-gbb, the eNB functions as an MCE, and there is a logical interface M2 on the X2 interface, through which the eNB forwards relevant information from the MCE to the en-gbb via the logical interface M2. On the other hand, the eNB extracts the IP multicast address of the current MBMS from the received MBMS configuration information of each cell, joins the IP multicast distribution of the current MBMS through the M1 interface with the MBMS-GW according to the IP multicast address, and receives data of the current MBMS from the MBMS-GW. The eNB forwards the MBMS data that needs to be broadcast in the cell belonging to the en-gNB through the X2 interface. In the process, for the en-gNB, the eNB functions as an MBMS-GW, and there is a logical interface M1 on the X2 interface, through which logical interface M1 the eNB forwards the data of the corresponding MBMS from the MBMS-GW to the en-gNB.

In fig. 4, the interfaces and processing procedures between the GCS AS, BM-SC and other types of servers are the existing methods, so the present invention does not describe the processing procedures between these network elements again. In the method and system of the present invention, the new functions and processes required for BM-SC, MBMS-GW, MME, MCE, eNB and en-gNB to implement MBMS broadcast via enhanced EPC and 5G NR will be described in detail.

The method and system of the present invention will be described in detail below with reference to the session establishment procedure of MBMS as an example, wherein the BM-SC, MBMS-GW, MCE, eNB, en-gbb and MBMS-GW require additional functions and processing procedures.

First, after the BM-SC receives the request to activate the MBMS bearer from the server, the BM-SC initiates an MBMS session start procedure. In the process, the BM-SC triggers other network elements to allocate related resources for the MBMS session and establishes a transmission channel for the transmission of the MBMS data. The method comprises the following specific steps:

step (1), BM-SC sends session start request to MBMS-GW. The message carries the session attributes.

The session attributes include: temporary Mobile Group Identity (TMGI), Flow Identifier (Flow Identifier), quality of service (QoS), MBMS service Area (MBMS service Area), cell identity list (list of cell IDs, optional), Session Identifier (Session Identifier), estimated Session duration (estimated Session duration), MBMS control plane node list (list of MBMS control plane nodes (5gc (amf) of MBMS GW, MMEs, SGSNs) for MBMS GW), time to MBMS data transfer (time to MBMS data transfer, time from receiving MBMS Session start request message to MBMS data start transmission), MBMS transfer start (MBMS transfer start, being an absolute time point at which MBMS data start transmission) and (access indicator).

When the MBMS is broadcasted through NR, an access indicator in the session attribute supports the following 1, 2 or 3 new values:

(1)5G NR: MBMS uses only 5G NR transmission;

(2) BOTH E-UTRAN and 5G NR: MBMS adopts E-UTRAN and 5G NR transmission at the same time;

(3) ALL: MBMS employs UTRAN, E-UTRAN and 5G NR transmission simultaneously.

And (2) after the MBMS-GW receives the MBMS session starting request, feeding back an MBMS session starting Response (Session Start Response) to the BM-SC.

Step (3), MBMS-GW executes the following processing:

(3.1) allocating TNL resources for the session, comprising: an IP multicast address and a C-TEID;

and (3.2) establishing an MBMS Bearer context (MBMS Bearer context) for the session specified in the message, extracting the session attribute in the message, filtering nodes in a control plane node list in the session attribute by using an Access Indicator in the session attribute, removing the control plane nodes which do not conform to the RAT indicated by the Access Indicator, and replacing an old control plane node list in the session attribute by using a newly generated control plane node list. Adding TNL resource information allocated for the session in the new session attribute, and storing the new session attribute in the MBMS bearer context;

and (3.3) determining a corresponding MME according to the nodes in the newly generated control plane node list, and sending an MBMS session starting request to the corresponding MME. The message carries the session attributes. The session attributes include at least: TMGI, Flow Identifier, QoS, MBMS service Area, list of cell IDs (optional), Session Identifier, established Session duration, transport network IP Multicast Address (es)), IP Address of Multicast source (es) of the Multicast source, C-TEID.

Step (4), after receiving the MBMS conversation start request, the MME executes the following processing:

(4.1) establishing an MBMS bearing context for the session designated in the message, and saving the session attribute in the message in the context;

(4.2) determining each service area in the MBMS area ID list in the session attribute and/or the MCE corresponding to each cell in the cell ID list, and sending an MBMS session starting request to the corresponding MCE. Specifically, the message carries the session attribute. The session attributes include at least: TMGI, QoS, MBMS service area, list of cell IDs (optional) Session identifier, infected Session duration, transport network IP Multicast Address, IP Address of the Multicast source, C-TEID. The various MCEs described above are maintained in a downstream node list, and the downstream node list is maintained in context.

And (5) after receiving the session starting request, the MCE establishes an MBMS bearing context and saves the session attribute in the message. Feeding back the MBMS session start response to the MME.

And (6) after receiving the MBMS session starting response of at least one MCE, the MME feeds back the MBMS session starting response to the MBMS-GW.

And (7) the MCE, the eNB and the en-gNB perform corresponding processing to allocate the radio resources for the MBMS session.

And (8) performing corresponding processing by the MCE, the eNB and the en-gNB, accessing the IP multicast distribution of the MBMS session by the eNB through an M1 interface, when the MBM service needs to be broadcasted in a cell belonging to the en-gNB, the eNB prepares to forward the received MBMS data to the en-gNB through a logical interface M1 on an X2 interface, and the en-gNB prepares to receive the data of the MBMS session from the ng-eNB through a logical interface M1 on an X2 interface.

Step (9), BM-SC starts transmitting MBMS data

And (10) the MBMS-GW receives the data of the MBM service from the BM-SC and transmits the data of the MBMS to each joined eNB node in an IP multicast distribution mode.

And (11) the eNB broadcasts the received MBMS data in the cell of the eNB, and when the MBMS needs to be broadcast in the cell belonging to the en-gNB, the eNB forwards the MBMS data to the en-gNB, and the en-gNB broadcasts the MBMS data in the cell of the eNB.

In the above steps (7) and (8), the MCE, eNB and en-gNB processing procedures are as follows:

(1) when the MCE receives a SESSION START request (SESSION START request) for an MBMS from the MME, the MCE determines, among cells controlled by itself, the respective cells that need to broadcast the MBMS, and identifies, from among the cells, a cell belonging to a specific eNB and a cell belonging to a specific en-gNB connected to the specific eNB.

(2) For each cell belonging to the eNB, the MCE determines the way in which the MBMS is broadcast in that cell: MBSFN mode or SC-PTM mode. The specific treatment is as follows: when the MCE determines that the corresponding MBMS are broadcasted in the cells belonging to the specific eNB in an MBSFN mode, the MCE uniformly allocates radio resources for the corresponding MBMS in the cells, and each cell adopts the uniformly allocated radio resources to broadcast the corresponding MBMS. When the MCE determines that the corresponding MBMS is broadcast in an SC-PTM manner in several cells belonging to the eNB, the MCE determines a cell ID list of the cells. The processing of this step is the processing already supported by the current 3GPP protocol.

(3) For cells belonging to an en-gNB connected to the eNB, the MCE determines the manner in which the MBMS are broadcast in these cells. The processing in this step is the new function of MCE. In the present invention, for MBMS broadcast in the cell of the en-gNB, it can be specified in the 3GPP protocol: and broadcasting the MBMS only by adopting an MBSFN mode or broadcasting the MBMS only by adopting an SC-PTM mode. It can also be specified explicitly in the 3GPP protocol: and broadcasting the MBMS by adopting an MBSFN mode or broadcasting the MBMS by adopting an SC-PTM mode. When the MBMS has only one broadcasting mode explicitly specified in the 3GPP protocol, the MCE directly selects the mode to broadcast each MBMS. When it is explicitly specified in the 3GPP protocol that the MBMS can be broadcasted in the MBSFN manner or the SC-PTM manner, the MCE determines, among the cells belonging to the specific en-gbb, the respective cells that broadcast the MBMS in the MBSFN manner, and the respective cells that broadcast the MBMS in the SC-PTM manner. When the MCE determines that the corresponding MBMS are broadcasted in the cells belonging to the en-gNB in an MBSFN mode, the MCE uniformly allocates radio resources for the corresponding MBMS in the cells according to QoS information in MBMS session attributes in the session starting request, and each cell adopts the uniformly allocated radio resources to broadcast the corresponding MBMS.

In general, the cells are geographically adjacent cells, and the cells form an MBSFN area, and when the UE moves in the area, the signals of the corresponding MBMS received by the UE from the cells in the area are multipath components of the same signal, and the UE can obtain diversity gain through multipath combining.

When the MCE determines that the corresponding MBMS are broadcast in the SC-PTM mode in a plurality of cells belonging to the en-gNB, the MCE determines a corresponding cell ID list and allocates the necessary NR parameter for the MBM service. The NR parameters may include: assigning a unique group ID to the corresponding MBMS: the group ID is used for identifying different MBMS in NR cells, and in each cell broadcasting the MBMS in an SC-PTM mode, the PDCCH scrambled by the group ID is used for broadcasting the scheduling information of the MBMS to UE through CRC; determining other necessary NR parameters, the corresponding NR parameters may include: the time-frequency position, the subcarrier interval and the CP type of BWP broadcasting MBMS, the search space corresponding to PDCCH scheduling MBMS, the configuration information of control resource set and the like.

(4) The MCE sends the following information to the eNB through the M2 interface with the eNB:

a cell ID list of a cell broadcasting MBMS in an MBSFN mode in a cell belonging to an eNB, configuration information of radio resources uniformly allocated for the corresponding MBMS and session attributes of the MBMS; a cell ID list of a cell broadcasting MBMS in an SC-PTM manner among cells belonging to a specific eNB and session attributes of the MBMS; a cell ID list of a cell broadcasting MBMS in a MBSFN manner in a cell belonging to a specific en-gNB, configuration information of radio resources uniformly allocated for a corresponding MBMS and session attributes of the MBMS; a cell ID list of a cell broadcasting MBMS in an SC-PTM manner among cells belonging to a specific en-gNB and session attributes of the MBMS; and the MCE allocates NR parameters for the MBMS.

(5) After receiving the information sent by the MCE through the M2 interface, the eNB performs the following processes:

and adding corresponding IP multicast distribution through an M1 interface according to TNL configuration information in the session attribute of the MBMS, and receiving data of the MBMS from the MBMS-GW.

Broadcasting MBMS in a MBSFN mode or an SC-PTM mode in a cell belonging to the MBMS: MBMS data is broadcast.

When an SC-PTM mode is needed to broadcast MBMS in a cell, an eNB allocates radio resources for the cell. And then broadcasts the received data of the MBMS through the radio resource.

When MBMS needs to be broadcast in an en-gNB cell, the eNB forwards the following information to the specific en-gNB through logical interface M2 on the X2 interface.

A cell ID list of a cell broadcasting MBMS in a MBSFN manner in a cell belonging to a specific en-gNB, configuration information of radio resources uniformly allocated for a corresponding MBMS and session attributes of the MBMS; a cell ID list of a cell broadcasting MBMS in an SC-PTM manner among cells belonging to a specific en-gNB and session attributes of the MBMS; and the MCE allocates NR parameters for the MBMS.

When an MBMS needs to be broadcast in a specific en-gNB cell, the specific eNB forwards the MBMS data received from the M1 interface to the specific en-gNB through the logical interface M1 on the X2 interface.

The eNB broadcasts the corresponding MBMS in the MBSFN mode or the SC-PTM mode in the cell belonging to itself as a processing mode already supported by the current 3GPP protocol, which is not described herein again.

(6) The en-gNB broadcasts the MBMS in the MBSFN mode or the SC-PTM mode in the corresponding cell according to the information received from the logical interface M2 on the X2 interface: MBMS data received from logical interface M1 on the X2 interface is broadcast. The step is a new function. The specific treatment is as follows:

and broadcasting the MBMS according to the radio resources uniformly distributed by the MCE in each cell broadcasting the MBMS in the MBSFN mode. In the cell broadcasting the MBMS in the SC-PTM mode, distributing wireless resources for the corresponding MBMS according to the QOS information in the session attribute of the MBMS, and broadcasting the corresponding MBMS through the distributed wireless resources. When the MCE allocates the NR parameter to the MBMS, the en-gNB allocates the wireless resource to the MBMS according to the allocated NR parameter and the QOS information in the session attribute of the service. Namely: and directly adopting the group ID allocated by the MCE as the group ID of the MBMS on an air interface, and allocating radio resources to the MBMS according to other necessary NR parameters determined by the MCE. The en-gNB receives the eNB forwarded MBMS data directly through a logical interface M1 on the X2 interface. And broadcasting the data of the service through the allocated wireless resource.

In the method and the system for providing the MBMS in the NR cell through the en-gNB, the eNB proxies the functions of the M2 and the M1 at an X2 interface connected with the en-gNB, and the en-gNB broadcasts the MBMS in the 5G NR according to the signaling of the M2 interface forwarded by the eNB and the MBMS data on the M1 interface.

The second embodiment:

As can be seen from fig. 5, the eNB does not proxy the M2 and M1 functions, the MCE is connected to the en-gbb through the M2 interface, and the MBMS-GW is connected to the en-gbb through the M1 interface. In fig. 5, an interface M2 between the new en-gNB and the MCE and an interface M1 between the new en-gNB and the MBMS-GW are added. Wherein, the establishment process of the M2 interface between the MCE and the en-gNB is the same as the establishment process of the existing M2 interface; the establishment process of the M1 interface between the MBMS-GW and the en-gNB is the same as the establishment process of the existing M1 interface.

For cells belonging to the en-gNB connected to the eNB, the MCE determines the way in which the MBMS are broadcast in these cells. In the embodiment of the present invention, for MBMS broadcast in the cell of the en-gbb, it can be specified explicitly in the 3GPP protocol as: and broadcasting the MBMS only by adopting an MBSFN mode or broadcasting the MBMS only by adopting an SC-PTM mode. Optionally, it may also be explicitly specified in the 3GPP protocol: and broadcasting the MBMS by adopting an MBSFN mode or broadcasting the MBMS by adopting an SC-PTM mode. Wherein: when the 3GPP protocol specifies that the MBMS has only one broadcast mode (MBSFN mode or SC-PTM mode), the MCE directly selects the mode to broadcast each MBMS. When it is explicitly specified in the 3GPP protocol that the MBMS can be broadcasted in the MBSFN manner or in the SC-PTM manner, the MCE determines, among the cells belonging to the en-gbb, the respective cells that broadcast the MBMS in the MBSFN manner, and the respective cells that broadcast the MBMS in the SC-PTM manner.

The second method comprises the following steps: in the cell of the en-gNB, the MCE determines a cell ID list of a cell broadcasting the MBMS in an SC-PTM mode, and uniformly allocates the following NR parameters for the MBMS:

(1) unique group ID assigned to the corresponding MBMS: the unique group ID is used to identify different MBMS in NR cells, and at the same time, in each cell broadcasting MBMS in SC-PTM, scheduling information of MBMS is broadcast to UEs through PDCCH scrambled with the group ID by CRC.

(2) And determining: configuration information of BWP broadcasting MBMS, wherein the configuration information includes: the time-frequency position, subcarrier interval and CP type of BWP of the broadcast MBMS; the search space corresponding to the PDCCH for scheduling the MBMS and the configuration information of the control resource set, and so on.

Furthermore, the MCE, through an M2 interface with the en-gNB, can send the following information to the en-gNB:

(1) the MBMS service center comprises a cell ID list of a cell which broadcasts the MBMS in an MBSFN mode in cells belonging to an en-gNB, configuration information of radio resources which are uniformly distributed for the corresponding MBMS and session attributes of the MBMS in a session starting request of the MBMS.

(2) The method comprises the steps of receiving a session start request of an MBMS by an MCE, broadcasting the MBMS in an SC-PTM mode in a cell belonging to an en-gNB, and receiving a cell ID list of the cell and session attributes of the corresponding MBMS in the session start request of the MBMS received by the MCE.

(3) And when the MCE adopts the processing specified in the mode two for each cell which broadcasts the corresponding MBMS in the SC-PTM mode in the cell of the en-gNB, the relevant NR parameter distributed by the MCE for the corresponding MBMS is required to be sent to the eNB through an M2 interface.

After the en-gNB receives the above information sent by the MCE through the M2 interface, the following processes may be performed:

(1) and according to the session attribute of the MBMS in the MBMS session starting request, adding corresponding IP multicast distribution through an M1 interface, and receiving data of the MBMS from the MBMS-GW.

(2) And broadcasting the corresponding MBMS in the corresponding cell in an MBSFN mode or an SC-PTM mode according to the information related to the cell received from the MCE in the cell belonging to the cell: MBMS data is broadcast. The specific treatment comprises the following steps: broadcasting the MBMS in each cell which broadcasts the MBMS in an MBSFN mode according to radio resources uniformly distributed by MCE; in a cell broadcasting the MBMS in an SC-PTM mode, allocating wireless resources for the corresponding MBMS according to the session attribute of the corresponding MBMS in the session start request of the MBMS, and broadcasting the corresponding MBMS through the allocated wireless resources; when the MCE performs the processing specified in the second mode for each cell in the en-gbb that broadcasts the corresponding MBMS in the SC-PTM mode, when allocating the radio resource for the corresponding MBMS as described above, it is necessary to allocate the radio resource to the MBMS based on the NR parameter allocated by the MCE for the corresponding MBMS. Namely: and directly adopting the group ID distributed by the MCE as the group ID of the MBMS on an air interface, determining the BWP of the MBMS broadcast in the cell according to the BWP configuration information determined by the MCE, and distributing wireless resources to the MBMS in the corresponding BWP.

The en-gNB receives MBMS data from the MBMS-GW directly through the newly added M1 interface with the MBMS-GW.

For fig. 5, the following is further illustrated:

in fig. 5, the processing of the method and system of the present invention is similar to that of fig. 4. The difference lies in that: in the method and system corresponding to fig. 5, the specific processing of steps (7) and (8) is as follows:

(1) when the MCE receives an MBMS SESSION START request (SESSION START request) from the MME, the MME determines the cells that need to broadcast the MBMS among the cells it controls, and identifies from these cells the cells belonging to a particular eNB and the cells belonging to a particular en-gNB.

(2) For each cell belonging to the eNB, the MCE determines the way in which the MBMS is broadcast in that cell: MBSFN mode or SC-PTM mode.

(3) For cells belonging to the en-gNB, the MCE determines the manner in which the MBMS are broadcast in these cells.

(4) The MCE sends the following information to the en-gNB through a newly added M2 interface with the en-gNB: a cell ID list of a cell broadcasting MBMS in a MBSFN manner in a cell belonging to a specific en-gNB, configuration information of radio resources uniformly allocated for a corresponding MBMS and session attributes of the MBMS; a cell ID list of a cell broadcasting MBMS in an SC-PTM manner among cells belonging to a specific en-gNB and session attributes of the MBMS; and the MCE allocates NR parameters for the MBMS.

(5) After the en-gNB receives the information sent by the MCE through the M2 interface, the following processing is executed: adding corresponding IP multicast distribution through a newly added M1 interface according to TNL configuration information in the session attribute of the MBMS, and receiving MBMS data from the MBMS-GW; broadcasting the corresponding MBMS in an MBSFN mode or an SC-PTM mode in the cell belonging to the cell: MBMS data is broadcast.

It can be seen that, in fig. 5, the eNB does not proxy the M1 function nor the M2 function, the corresponding MBMS GW is connected to the en-gNB through the newly added M1 interface, and the corresponding MCE is connected to the en-gNB through the newly added M2 interface.

Example three:

fig. 6 is a system structure diagram of a non-independently deployed 5G system carrying MBMS according to a third embodiment of the present invention. As shown in fig. 6, the eNB agent M1 functions, and the MCE is connected to the en-gNB through the newly added M2 interface, where the process of establishing the M2 interface between the MCE and the en-gNB is the same as the process of establishing the existing M2 interface.

For each cell belonging to the eNB, the MCE determines the manner of broadcasting the MBMS in the cell as follows: MBSFN mode or SC-PTM mode. The specific treatment comprises the following steps: (1) when the MCE determines that the corresponding MBMS are broadcasted in the cells belonging to the eNB in an MBSFN mode, the MCE uniformly allocates radio resources for the corresponding MBMS in the cells, and the cells broadcast the corresponding MBMS by adopting the uniformly allocated radio resources. (2) And when the MCE determines that the corresponding MBMS are broadcasted in a SC-PTM mode in a plurality of cells belonging to the eNB, the MCE determines a cell ID list of the cells.

For cells belonging to an en-gNB connected to the eNB, the MCE determines the manner in which the MBMS are broadcast in these cells. In the embodiment of the present invention, for MBMS broadcast in the cell of the en-gbb, it can be specified explicitly in the 3GPP protocol as: and broadcasting the MBMS only by adopting an MBSFN mode or broadcasting the MBMS only by adopting an SC-PTM mode. Optionally, it may also be explicitly specified in the 3GPP protocol: and broadcasting the MBMS in an MBSFN mode or an SC-PTM mode. Wherein: when the 3GPP protocol specifies that the MBMS has only one broadcast mode (MBSFN mode or SC-PTM mode), the MCE directly selects the mode to broadcast each MBMS. When it is explicitly specified in the 3GPP protocol that the MBMS can be broadcasted in both the MBSFN manner and the SC-PTM manner, the MCE determines, among the cells belonging to the en-gbb, the respective cells that broadcast the MBMS in the MBSFN manner, and the respective cells that broadcast the MBMS in the SC-PTM manner.

When the MCE determines that the corresponding MBMS are broadcasted in the cells belonging to the en-gNB in the MBSFN mode, the MCE uniformly allocates radio resources for the corresponding MBMS in the cells, and each cell adopts the uniformly allocated radio resources to broadcast the corresponding MBMS. In general, the cells are geographically adjacent cells, the cells form an MBSFN area, when the UE moves in the area, signals of corresponding MBMS received by the UE from the cells in the area are multipath components of the same signal, and the UE can obtain diversity gain through multipath combining.

The second method comprises the following steps: in the cell of the en-gNB, the MCE determines a cell ID list of a cell broadcasting the MBMS in an SC-PTM mode and uniformly allocates the following NR parameters for the MBMS:

(1) assigning a unique group ID to the corresponding MBMS: the unique group ID is used to identify different MBMS in NR cells, and at the same time, in each cell broadcasting MBMS in SC-PTM, scheduling information of MBMS is broadcast to UEs through PDCCH scrambled with the group ID by CRC.

(1) the MBMS service system includes an eNB, a cell ID list of a cell that broadcasts an MBMS in an MBSFN manner in a cell belonging to the eNB, configuration information of radio resources collectively allocated for the corresponding MBMS, and a session attribute of the MBMS in a session start request of the MBMS.

(2) The method comprises the steps of receiving a cell ID list of a cell broadcasting the MBMS in an SC-PTM mode in a cell belonging to an eNB and session attributes of corresponding MBMS in a session start request of the MBMS received by an MCE.

In addition, the MCE may send the following information to the en-gNB through the newly added M2 interface with the en-gNB:

After receiving the information sent by the MCE through the M2 interface between the eNB and the MCE, the eNB performs the following processing:

(1) and according to the session attribute of the MBMS in the session starting request of the MBMS, adding corresponding IP multicast distribution through an M1 interface, and receiving data of the MBMS from the MBMS-GW.

(2) And broadcasting the corresponding MBMS in the corresponding cell in an MBSFN mode or an SC-PTM mode according to the information related to the cell received from the MCE in the cell belonging to the cell: MBMS data is broadcast.

(3) And the MBMS data received from the MBMS-GW is forwarded to the en-gNB through a logical interface M1 on an X2 interface.

After the en-gNB receives the information sent by the MCE through an M2 interface between the en-gNB and the MCE, the following processing is executed:

(1) receiving MBMS data from the MBMS-GW from the eNB through a logical interface M1 on an X2 interface;

(2) and broadcasting the corresponding MBMS in the corresponding cell in an MBSFN mode or an SC-PTM mode according to the information related to the cell and received from the MCE in the cell belonging to the cell: MBMS data is broadcast.

For fig. 6, the following is further illustrated:

in fig. 6, the processing of the method and system of the present invention is similar to the processing of the method and system of fig. 4. The difference lies in that: in the method and system corresponding to fig. 6, the following processes are added among the MCE, eNB and en-gNB in the above steps (7) and (8):

(1) when the MCE receives an MBMS SESSION START request (SESSION START request) from the MME, the MME determines the cells that need to broadcast the MBMS among the cells it controls, and identifies from these cells the cells belonging to the eNB and the cells belonging to the en-gNB connected to the eNB.

(3) For cells belonging to an en-gNB connected to the eNB, the MCE determines the manner in which the MBMS are broadcast in these cells.

a cell ID list of a cell broadcasting MBMS in an MBSFN manner in a cell belonging to an eNB, configuration information of radio resources uniformly allocated for a corresponding MBMS and session attributes of the MBMS; a cell ID list of a cell broadcasting MBMS in an SC-PTM manner among cells belonging to the eNB and session attributes of MBMS.

The MCE sends the following information to the en-gNB through the M2 interface with the en-gNB:

a cell ID list of a cell broadcasting MBMS in a MBSFN manner in a cell belonging to an en-gNB, configuration information of radio resources uniformly allocated for a corresponding MBMS and session attributes of the MBMS; a cell ID list of a cell broadcasting the MBMS in an SC-PTM manner in a cell belonging to the en-gNB and session attributes of the MBMS; and the MCE allocates NR parameters for the MBMS.

(5) After receiving the information sent by the MCE through the M2 interface, the eNB performs the following processing: adding corresponding IP multicast distribution through an M1 interface according to TNL configuration information in the session attribute of the MBMS, and receiving data of the MBMS from the MBMS-GW; in the cell belonging to itself, according to the information related to itself received from the MCE, broadcasting the corresponding MBMS in the corresponding cell in an MBSFN mode or an SC-PTM mode: broadcasting MBMS data; when an MBMS needs to be broadcast in an en-gNB cell, the eNB forwards MBMS data received from the M1 interface to the en-gNB through the logical interface M1 on the X2 interface.

(6) After the en-gNB receives the information sent by the MCE through the M2 interface, the following processing is executed: receiving MBMS data from the MBMS-GW through a logical interface M1 on an X2 interface from the eNB; in the cell belonging to itself, according to the information related to itself received from the MCE, broadcasting the corresponding MBMS in the corresponding cell in an MBSFN mode or an SC-PTM mode: MBMS data is broadcast.

It can be seen that in the method and system shown in fig. 6, the eNB proxy M1 functions, and the corresponding MCE is connected to the en-gNB through the M2 interface.

Example four:

fig. 7 is a system structure diagram of a non-independently deployed 5G system carrying MBMS according to a fourth embodiment of the present invention. As shown in fig. 7, the eNB proxy M2 functions, and the MBMS-GW connects to the en-gNB through the newly added M1 interface.

For cells belonging to an en-gNB connected to the eNB, the MCE determines the manner in which the MBMS are broadcast in these cells. In the embodiment of the present invention, for MBMS broadcast in the cell of the en-gbb, it can be specified explicitly in the 3GPP protocol as: and broadcasting the MBMS only by adopting an MBSFN mode or only adopting an SC-PTM mode. Optionally, it may also be explicitly specified in the 3GPP protocol: and broadcasting the MBMS by adopting an MBSFN mode or broadcasting the MBMS by adopting an SC-PTM mode. Wherein: when the 3GPP protocol specifies that the MBMS has only one broadcast mode (MBSFN mode or SC-PTM mode), the MCE directly selects the mode to broadcast each MBMS. When it is explicitly specified in the 3GPP protocol that the MBMS can be broadcasted in MBSFN or SC-PTM, the MCE determines, among the cells belonging to the en-gNB, the cells that broadcast the MBMS in MBSFN and the cells that broadcast the MBMS in SC-PTM.

(2) And determining: configuration information of BWP broadcasting MBMS, wherein the configuration information includes: the time-frequency position, subcarrier interval and CP type of BWP broadcasting MBMS; the search space corresponding to the PDCCH for scheduling the MBMS and the configuration information of the control resource set, and so on.

Furthermore, the MCE may send the following information to the eNB through an M2 interface with the eNB:

(1) the MBMS service center includes a cell ID list of a cell broadcasting MBMS in an MBSFN manner in a cell belonging to an eNB, configuration information of radio resources uniformly allocated for the corresponding MBMS, and a session attribute of the MBMS in a session start request of the MBMS.

(3) The MBMS service center comprises a cell ID list of a cell which broadcasts the MBMS in an MBSFN mode in cells belonging to an en-gNB, configuration information of radio resources which are uniformly distributed for the corresponding MBMS and session attributes of the MBMS in a session starting request of the MBMS.

(4) The method comprises the steps of receiving a session start request of an MBMS from an MCE, broadcasting a cell ID list of a cell of the MBMS in an SC-PTM mode in a cell belonging to an en-gNB and receiving session attributes of the corresponding MBMS in the session start request of the MBMS by the MCE.

(5) And when the MCE adopts the processing specified in the mode two for each cell which broadcasts the corresponding MBMS in the SC-PTM mode in the cell of the en-gNB, the relevant NR parameter distributed by the MCE for the corresponding MBMS is required to be sent to the eNB through an M2 interface.

After receiving the above information sent by the MCE through the M2 interface, the eNB may perform the following processing:

(3) The eNB forwards the following information to the en-gNB over logical interface M2 on the X2 interface: a cell ID list of a cell broadcasting MBMS in a MBSFN manner in a cell belonging to an en-gNB and configuration information of radio resources uniformly allocated for the corresponding MBMS; a cell ID list of a cell broadcasting the MBMS in an SC-PTM mode in a cell belonging to the en-gNB and session attributes of corresponding MBMS in an MBMS session starting request received by the MCE; when the MCE performs the processing specified in the second mode for each cell of the en-gNB broadcasting the corresponding MBMS in the SC-PTM mode, the relevant NR parameter allocated by the MCE for the corresponding MBMS needs to be sent to the eNB through the logical interface M2 on the X2 interface.

The en-gNB broadcasts the MBMS in the corresponding cell in the MBSFN mode or the SC-PTM mode according to the information received from the logical interface M2 on the X2 interface. Specifically, the following processing is performed: adding corresponding IP multicast distribution through an M1 interface according to the session attribute of the MBMS in the session start request of the MBMS, and receiving the data of the MBMS from the MBMS-GW; broadcasting the MBMS in each cell which broadcasts the MBMS in an MBSFN mode according to radio resources uniformly distributed by MCE; in a cell broadcasting the MBMS in an SC-PTM mode, allocating wireless resources for the corresponding MBMS according to QOS information in the session attribute of the corresponding MBMS in a session start request of the MBMS, and broadcasting the corresponding MBMS through the allocated wireless resources.

For fig. 7, the following is further illustrated:

in fig. 7, the processing of the method and system of the present invention is similar to that of fig. 4. The difference lies in that: in the method and system corresponding to fig. 7, the following processes are newly added among the MCE, eNB, and en-gNB in the above steps (7) and (8):

(3) For cells belonging to the en-gNB connected to the eNB, the MCE determines the way in which the MBMS are broadcast in these cells.

(4) The MCE sends the following information to the eNB through the M2 interface with the particular eNB:

a cell ID list of a cell broadcasting MBMS in an MBSFN manner in a cell belonging to an eNB, configuration information of radio resources uniformly allocated for a corresponding MBMS and session attributes of the MBMS; a cell ID list of a cell broadcasting the MBMS in an SC-PTM mode in a cell belonging to the eNB and session attributes of the MBMS; a cell ID list of a cell broadcasting MBMS in a MBSFN manner in a cell belonging to an en-gNB, configuration information of radio resources uniformly allocated for a corresponding MBMS and session attributes of the MBMS; a cell ID list of a cell broadcasting the MBMS in an SC-PTM manner in a cell belonging to the en-gNB and session attributes of the MBMS; the MCE allocates an NR parameter for the MBMS.

(5.1) adding corresponding IP multicast distribution through an M1 interface according to TNL configuration information in the session attribute, and receiving MBMS data from the MBMS-GW;

(5.2) broadcasting the corresponding MBMS in the corresponding cell in the MBSFN mode or the SC-PTM mode according to the information related to the cell received from the MCE in the cell belonging to the cell: broadcasting MBMS data;

(5.3) forward the following information to the en-gNB through logical interface M2 on the X2 interface:

a cell ID list of a cell broadcasting MBMS in an MBSFN manner among cells belonging to the en-gNB and session attributes of the MBMS; a cell ID list of a cell broadcasting the MBMS in an SC-PTM manner among cells belonging to the en-gNB, and a session attribute of the MBMS; and the MCE allocates NR parameters for the MBMS.

(6) The en-gNB broadcasts the MBMS in the corresponding cell in the MBSFN mode or the SC-PTM mode according to the information received from the logical interface M2 on the X2 interface. The en-gNB performs the following specific processing:

(6.1) adding corresponding IP multicast distribution through an M1 interface according to TNL configuration information in the session attribute of the MBMS, and receiving data of the MBMS from the MBMS-GW;

(6.2) broadcasting the corresponding MBMS in the corresponding cell in the MBSFN mode or the SC-PTM mode according to the information related to the cell and received from the MCE in the cell belonging to the cell: MBMS data is broadcast.

As shown in fig. 8, the apparatus includes: a processor 801 and a memory 802; in which a memory 802 has stored therein an application executable by the processor 801 for causing the processor 801 to perform a method of non-independently deployed 5G system bearers MBMS as described in any of the above.

The memory 802 may be embodied as various storage media such as an Electrically Erasable Programmable Read Only Memory (EEPROM), a Flash memory (Flash memory), and a Programmable Read Only Memory (PROM). The processor 801 may be implemented to include one or more central processors or one or more field programmable gate arrays that integrate one or more central processor cores. In particular, the central processor or central processor core may be implemented as a CPU or MCU or DSP, etc.

It should be noted that not all steps and modules in the above flows and structures are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The division of each module is only for convenience of describing adopted functional division, and in actual implementation, one module may be divided into multiple modules, and the functions of multiple modules may also be implemented by the same module, and these modules may be located in the same device or in different devices.

The hardware modules in the various embodiments may be implemented mechanically or electronically. For example, a hardware module may include a specially designed permanent circuit or logic device (e.g., a special purpose processor such as an FPGA or ASIC) for performing specific operations. A hardware module may also include programmable logic devices or circuits (e.g., including a general-purpose processor or other programmable processor) that are temporarily configured by software to perform certain operations. The implementation of the hardware module in a mechanical manner, or in a dedicated permanent circuit, or in a temporarily configured circuit (e.g., configured by software), may be determined based on cost and time considerations.

The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform a method as described herein. Specifically, a system or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any of the embodiments described above is stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program code stored in the storage medium. Further, part or all of the actual operations may be performed by an operating system or the like operating on the computer by instructions based on the program code. The functions of any of the above-described embodiments may also be implemented by writing the program code read out from the storage medium to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causing a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on the instructions of the program code.

Examples of the storage medium for supplying the program code include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD + RWs), magnetic tapes, nonvolatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer or the cloud by a communication network.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative. For the sake of simplicity, the drawings are only schematic representations of the parts relevant to the invention, and do not represent the actual structure of the product. Moreover, in the interest of brevity and understanding, only one of the components having the same structure or function is illustrated schematically or designated in some of the drawings. In this document, "a" does not mean that the number of the relevant portions of the present invention is limited to "only one", and "a" does not mean that the number of the relevant portions of the present invention "more than one" is excluded. In this document, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for carrying MBMS by a non-independently deployed 5G system is characterized by comprising the following steps:

when a multi-cell multicast coordination entity MCE receives a multimedia broadcast multicast service MBMS session starting request from a mobile management entity MME, determining a cell which needs to broadcast the MBMS and belongs to an evolved node B eNB and a cell which needs to broadcast the MBMS and belongs to an en-gNB connected with the eNB;

the eNB receives MBMS data from an MBMS-GW based on the first MBMS configuration information, and broadcasts the MBMS data in a cell belonging to the eNB based on the first broadcast mode; the en-gNB broadcasts the MBMS data in the cell belonging to the en-gNB based on a second broadcast mode;

the second broadcasting method includes:

only adopting a single-cell point-to-multipoint SC-PTM mode;

and adopting an MBSFN mode or an SC-PTM mode.

2. The method of claim 1, further comprising: configuring a logical interface M1 and a logical interface M2 on an X2 interface between the eNB and the en-gNB;

wherein the eNB receiving MBMS data from an MBMS gateway MBMS-GW based on the first MBMS configuration information comprises: extracting a multicast address in the first MBMS configuration information; receiving the MBMS data from the MBMS-GW through an M1 interface with the MBMS-GW according to the multicast address;

3. The method of claim 1, further comprising: an newly added M2 interface is arranged between the en-gNB and the MCE, and an newly added M1 interface is arranged between the en-gNB and the MBMS-GW;

the method further comprises the following steps: the en-gNB extracts a multicast address in the second MBMS configuration information; and receiving the MBMS data through an added M1 interface between the MBMS-GW and the MBMS-GW according to the multicast address.

4. The method of claim 1, further comprising: configuring a logic interface M1 on an X2 interface between the eNB and the en-gNB, and setting a newly added M2 interface between the en-gNB and the MCE;

5. The method of claim 1, further comprising: configuring a logic interface M2 on an X2 interface between the eNB and the en-gNB, and setting a newly added M1 interface between the en-gNB and the MBMS-GW;

6. The method according to claim 1, wherein the SC-PTM scheme comprises an SC-PTM scheme of mode 1 and an SC-PTM scheme of mode 2, wherein:

in the SC-PTM scheme of scheme 2: in a cell of the en-gNB, the MCE determines a cell ID list for broadcasting the MBMS in an SC-PTM mode and distributes an NR parameter for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID for the current MBMS and determines configuration information of a bandwidth part BWP broadcasting the MBMS, wherein the configuration information of the BWP includes: the time-frequency position, the subcarrier interval and the CP type of BWP broadcasting MBMS, the search space corresponding to a physical downlink control channel PDCCH dispatching MBMS and the configuration information of a control resource set.

7. The method of claim 6,

when the second broadcast mode includes an MBSFN mode, the second MBMS configuration information includes: a cell ID list for broadcasting MBMS in a MBSFN manner in cells belonging to the en-gNB; wireless resource configuration information uniformly allocated for the MBMS; session attributes of MBMS in an MBMS session start request;

8. A system for carrying MBMS in a non-independently deployed 5G system, comprising an MCE, an eNB, and an en-gNB connected to the eNB, wherein:

the en-gNB is further used for broadcasting the MBMS data in the cell belonging to the en-gNB based on a second broadcasting mode;

the second broadcasting method includes:

only adopting a single-cell point-to-multipoint SC-PTM mode;

adopting MBSFN mode or SC-PTM mode.

9. The system of claim 8,

a logical interface M1 and a logical interface M2 are configured on an X2 interface between the eNB and the en-gNB;

10. The system of claim 8,

a newly added M2 interface is arranged between the en-gNB and the MCE, and a newly added M1 interface is arranged between the en-gNB and the MBMS-GW;

the en-gNB is used for receiving the second MBMS configuration information through the newly added M2 interface between the MCE and the user equipment; extracting a multicast address in the second MBMS configuration information; and receiving the MBMS data through a newly added M1 interface between the MBMS-GW according to the multicast address.

11. The system of claim 8,

a logic interface M1 is configured on an X2 interface between the eNB and the en-gNB, and a newly added M2 interface is arranged between the en-gNB and the MCE;

12. The system of claim 8,

a logic interface M2 is configured on an X2 interface between the eNB and the en-gNB, and a newly added M1 interface is arranged between the en-gNB and the MBMS-GW;

wherein the eNB is used for receiving the second MBMS configuration information through an M2 interface between the eNB and an MCE; transmitting the second MBMS configuration information to the en-gNB based on the logical interface M2 on an X2 interface;

wherein the en-gNB is configured to extract a multicast address in the second MBMS configuration information; and receiving the MBMS data through an added M1 interface between the MBMS-GW and the MBMS-GW according to the multicast address.

13. The system of claim 8,

the SC-PTM mode comprises an SC-PTM mode of a mode 1 and an SC-PTM mode of a mode 2, wherein:

in the SC-PTM scheme of scheme 2: in a cell of the en-gNB, the MCE determines a cell ID list for broadcasting MBMS in an SC-PTM mode and distributes an NR parameter for the MBMS; the MCE allocating NR parameters for the MBMS comprises the following steps: the MCE allocates a unique group ID for the current MBMS and determines configuration information of a bandwidth part BWP broadcasting the MBMS, wherein the configuration information of the BWP includes: the time-frequency position, the subcarrier interval and the CP type of the BWP broadcasting the MBMS, the search space corresponding to a physical downlink control channel PDCCH for scheduling the MBMS and the configuration information of a control resource set.

14. The system of claim 13,

when the second broadcast mode includes an MBSFN mode, the second MBMS configuration information includes: a cell ID list for broadcasting MBMS in a MBSFN manner in cells belonging to the en-gNB; radio resource configuration information uniformly allocated for the MBMS; session attributes of MBMS in an MBMS session start request;

when the second broadcast mode includes the SC-PTM mode of mode 2, the second MBMS configuration information includes: broadcasting a cell ID list of MBMS in a SC-PTM manner in a cell belonging to the en-gNB; session attributes of MBMS in an MBMS session start request; NR parameters allocated for MBMS, the NR parameters comprising: the MCE allocates a unique group ID for the MBMS; and the MCE determines the configuration information of the BWP broadcasting the MBMS.

15. An apparatus for a non-independently deployed 5G system to carry MBMS, comprising a processor and a memory;

the memory has stored therein an application executable by the processor for causing the processor to perform the method of non-independently deployed 5G system bearer MBMS according to any one of claims 1 to 7.

16. A computer readable storage medium having stored therein computer readable instructions for performing the method of non-independently deployed 5G system bearer MBMS according to any one of claims 1 to 7.