CN110557831B - Transmission method and equipment for control plane information in simulcast SC-PTM system - Google Patents
Transmission method and equipment for control plane information in simulcast SC-PTM system Download PDFInfo
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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Abstract
The application discloses a transmission method and a system for control plane information in a simulcast SC-PTM system, wherein an eNodeB reports simulcast SC-PTM capability information of each cell to an MCE; when the MCE determines to send the MBMS in a simulcast SC-PTM mode, determining the configuration information of a PDSCH for sending the MBMS, and sending the information required by the MBMS receiving to a corresponding eNodeB through a special signaling; the eNodeB broadcasts the control information of the MBMS service to the UE through the SC-MCCH according to the information in the special signaling, and adopts the corresponding MCS to send a PDSCH and a corresponding pilot signal in the corresponding simulcast bandwidth of the corresponding simulcast subframe; the UE monitors SC-MCCH of corresponding cell, obtains control information of MBMS service transmitted in simulcast SC-PTM mode, and receives data of MBMS service according to the control information. By applying the technical scheme disclosed by the application, the related functions in the simulcast SC-PTM mode can be realized among the related network elements.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and a device for transmitting control plane information in a simulcast SC-PTM system.
Background
In a Long Term Evolution (LTE) system, a Multimedia Broadcast Multicast Service (MBMS) Service may be sent in a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) manner: all cells in one MBSFN area send the same MBMS signal through a Physical Multicast Channel (PMCH) in the same MBSFN subframe, so that a user receiving the MBMS can obtain diversity gain. Specifically, the PMCH uses an Extended Cyclic Prefix (ECP), a dedicated pilot, and a Modulation and Coding Scheme (MCS) configured in a semi-static manner, occupies the entire system bandwidth of the MBSFN subframe data field, and transmits the MBSFN subframe data field through the antenna port 4.
However, in general, users receiving the MBMS service only exist in a plurality of cells in the MBSFN area, and air interface resources are wasted when no user sends the MBMS service in the cell. In order To solve the problem that the air interface resources are wasted in the MBSFN mode, a Single Cell Point-To-Multipoint (SC-PTM) mode is introduced into the LTE system To send the MBMS service. This approach has the following advantages:
(1) In a wide area, only the cell where the user receiving the MBMS is located is selected to send the MBMS so as to save air interface resources of other cells without users.
(2) And a Physical Downlink Shared Channel (PDSCH) is adopted to send the MBMS, and the PDSCH can send the MBMS by adopting transmit diversity, thereby obtaining the transmit diversity gain which can not be obtained by PMCH single-antenna port sending.
(3) The normal CP can be configured to estimate the wireless channel using only Cell Reference Signals (CRS) without using dedicated pilots.
(4) The PDSCH transmitting MBMS services may share resources of the data domain with the PDSCH transmitting non-MBMS services in non-MBSFN subframes.
(5) The PDSCH for transmitting the MBMS is dynamically scheduled, scheduling information is transmitted through a PDCCH scrambled by a Group Radio Network Temporary Identity (G-RNTI), and the G-RNTI is used for identifying the MBMS at an air interface.
The SC-PTM mode is adopted to send the MBMS service, although the waste of air interface resources of the MBSFN mode can be avoided, the users can not obtain the diversity gain of the MBSFN mode. The reason is that: when the MBMS service is sent in the SC-PTM mode, the cell automatically determines to send the air interface resource and MCS used by the MBMS service, so that the signals of the same MBMS service sent by different cells are usually different, and a user cannot perform diversity combining on the MBMS service signals from different cells. In addition, the PDSCH transmitting the MBMS service employs dynamic scheduling, which occupies PDCCH resources compared to the MBSFN scheme.
In practical applications, the group service as a typical MBMS service exists in such application scenarios: users of a group service are concentrated in adjacent cells. Such as: in the hot spot area, coverage is performed by several cells. Police patrols are often found in these cells, and group service interaction information is used among the police. In this scenario, the same group service is sent in adjacent cells through an SC-PTM method, air interface resources and MCSs used by different cells are usually different, MBMS service signals sent are usually different, and these signals generally interfere with each other at the same frequency.
In order to solve the problem of co-channel interference caused by transmitting the MBMS service in the SC-PTM mode in the scene, and by taking the advantage of the MBSFN as a reference, the method for transmitting the MBMS service in the simulcast SC-PTM mode is provided. Specifically, for the MBMS service transmitted in the simulcast SC-PTM manner, each cell in the hot spot area of the service transmits the same MBMS service signal through PDSCH using the same time-frequency resource and MCS, so that the user can obtain diversity gain when receiving the group service in the hot spot area. For cells in non-hotspot regions, such as: there are some cells distributed sporadically for users, and each cell still transmits the MBMS service by the conventional SC-PTM method, that is: and the cell determines the time-frequency resource and MCS adopted by the service. In simulcast SC-PTMs, the introduction of simulcast areas indicates the above-mentioned hot spot areas. The simulcast SC-PTM technology has the following characteristics:
a) The simulcast region is composed of a plurality of adjacent cells, and the cells adopt the same time-frequency resource and the same MCS to send the same MBMS service signal through PDSCH in the same subframe, so that users in the cells can obtain diversity gain when receiving the MBMS service, and the same frequency interference is avoided.
b) The cell supporting the simulcast SC-PTM mode reports the capability of supporting the simulcast SC-PTM to a multi-cell/multicast coordination network element (MCE: multi-cell/multicast coding Entity) so that the MCE selects a transmission mode of the MBMS service.
c) For an MBMS service, the MCE determines one of an MBSFN transmission mode, an SC-PTM transmission mode and a simulcast SC-PTM transmission mode as the transmission mode of the MBMS service. When the MCE determines that the sending mode of the MBMS is the simulcast SC-PTM mode, the MCE determines the configuration information of the PDSCH sending the Service according to the Quality of Service (QoS) of the Service. The configuration information includes:
1) G-RNTI of the service: the G-RNTI is distributed by the MCE and is used for distinguishing different MBMS services at an air interface.
2) Semi-static configuration information of PDSCH: and sending a simulcast subframe of the PDSCH, the bandwidth occupied by the PDSCH and the MCS adopted by the PDSCH.
3) Other configuration information. Under the simulcast SC-PTM mode, the contents included in other configuration information are different according to the different modes of sending PDSCH of each cell in the simulcast area.
d) The MCE sends the configuration information of the MBMS service to evolved node bs (enodebs: evolved Node B) so that the eNodeB transmits the MBMS service through the PDSCH in each corresponding cell according to the configuration information of the MBMS service.
In the above technical solution for sending the MBMS service in the simulcast SC-PTM manner, a method of mapping PDSCH to Resource Element (RE) when sending the MBMS service by PDSCH in the simulcast SC-PTM manner and a design method of pilot signal for PDSCH channel estimation are specified. Simultaneously, the new function of MCE in a simulcast SC-PTM mode is defined: configuration information of a PDSCH for sending the MBMS is determined according to QoS of the MBMS, and the configuration information of the PDSCH is sent to a corresponding eNodeB. However, in order to implement the sending of the MBMS service in the simulcast SC-PTM manner, it is necessary to determine a transmission method of the control plane information in each network element in the simulcast SC-PTM manner, so that each corresponding network element can execute the relevant configuration according to the corresponding control information, thereby implementing the relevant functions in the simulcast SC-PTM manner, and the above technical solutions do not relate to the content in this respect.
Disclosure of Invention
The application provides a transmission method and equipment of control plane information in a simulcast SC-PTM system, so that each corresponding network element can realize related functions in a simulcast SC-PTM mode.
The application discloses a transmission method of control plane information in a simulcast SC-PTM system, which comprises the following steps:
the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE;
MCE determines the sending mode of MBMS service, when determining to send MBMS service in simulcast SC-PTM mode, determines the configuration information of PDSCH sending MBMS service, and sends the information needed by MBMS service receiving to corresponding eNodeB through dedicated signaling;
eNodeB establishes connection with MBMS GW according to the transmission network layer configuration information in the special signaling, and receives MBMS service data from MBMS GW;
the eNodeB determines the control information of the service on the SC-MCCH according to the PDSCH configuration information in the special signaling, and broadcasts the control information of the MBMS service to the UE through the SC-MCCH;
the eNodeB transmits the PDSCH and a corresponding pilot signal by adopting a corresponding MCS in a corresponding simulcast bandwidth of a corresponding simulcast subframe according to the PDSCH configuration information in the special signaling;
the UE monitors SC-MCCH of corresponding cell, obtains control information of MBMS service transmitted in simulcast SC-PTM mode, and receives corresponding MBMS service according to the information.
Preferably, the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE through the M2setup request message in the process of establishing the M2 interface, or the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE through a dedicated signaling;
the M2setup request message or the dedicated signaling carries: PLMN ID, eNodeB name, MBMS service related configuration information of each cell with simulcast SC-PMT capability.
Preferably, the MBMS service related configuration information of each cell with simulcast SC-PMT capability includes: PLMN ID of a cell, ID of the cell, ID of an MBSFN synchronous area where the cell is located, ID of each MBMS service area where the cell belongs and indication that the cell supports simulcasting SC-PTM;
if agreed in the 3GPP protocol: the CRS of each cell is still transmitted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM, and the MBMS service related configuration information of each cell with the simulcast SC-PTM capability further includes: the number of antenna ports for which the cell transmits CRS and the physical layer cell ID of the cell or the value of the physical layer cell ID modulo 6.
Preferably, the MCE sending the information required for receiving the MBMS service to the corresponding eNodeB through dedicated signaling includes: the MCE sends an MBMS conversation starting request message to a corresponding eNodeB, wherein the MBMS conversation starting request message carries: sending a cell ID list of the MBMS SESSION, an identifier TMGI of the MBMS service, an MBMS SESSION ID, an MBMS service area and TNL information of a transport network layer in a simulcast SC-PTM mode; the TNL information comprises: the IP multicast address, IP source address and GTP DL TEID of the MBMS conversation;
if agreed in the 3GPP protocol: the CRS of each cell is still transmitted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM, and then the MBMS session start request message also carries: and configuration information of CRS mapping patterns in the simulcast region.
Preferably, the determining, by the MCE, the configuration information of the PDSCH transmitting the MBMS service includes: and determining the sending period T, the radio frame offset, the simulcast subframe number set, the simulcast bandwidth and the MCS of the PDSCH.
Preferably, the method further comprises:
the MCE allocates G-RNTI and PDSCH resources to the MBMS session transmitted in a simulcast SC-PTM mode, determines SC-MCCH updating time and transmits the SC-MCCH updating time to the eNodeB.
Preferably, the method further comprises:
and the eNodeB determines the control information of the MBMS session on the SC-MCCH according to the G-RNTI and the PDSCH resource configuration information of the MBMS session, and determines the initial modification period for sending the control information of the MBMS session through the SC-MCCH according to the SC-MCCH updating time.
Preferably, the control information of the MBMS session on the SC-MCCH includes:
simulcast SC-PTM indication: the indication is used for indicating that the MBMS session adopts a simulcast SC-PTM mode;
TMGI, SESSION ID and G-RNTI of MBMS SESSION;
PDSCH configuration information, including: sending period T of PDSCH, radio frame offset, simulcast subframe number set, simulcast bandwidth and MCS;
neighbor cell list: the list provides the frequency point and physical layer cell ID of each neighbor cell;
sending the neighbor cell list of the MBMS session in a simulcast SC-PTM mode;
and configuration information of CRS mapping patterns in the simulcast region.
Preferably, if the following is agreed in the 3GPP protocol: the method comprises the steps that CRSs of all cells are still sent in a simulcast bandwidth where a PDSCH is located in a simulcast SC-PTM, and an eNodeB also needs to avoid REs occupied by the CRSs of all the cells in the simulcast bandwidth when RE mapping of the PDSCH is executed according to configuration information of CRS mapping patterns in the simulcast area in an MBMS session starting request message sent by an MCE;
if agreed in the 3GPP protocol: the dedicated pilot frequency is adopted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM for demodulating the PDSCH, the corresponding dedicated pilot frequency is sent in the simulcast bandwidth where the PDSCH is located, and the RE occupied by the dedicated pilot frequency is required to be avoided when RE mapping of the PDSCH is executed;
if CRS is transmitted by each cell in the simulcast region in the simulcast bandwidth, REs occupied by CRS need to be avoided in the mapping of the dedicated pilot.
The application also discloses a transmission system of control plane information in the simulcast SC-PTM system, which comprises: eNodeB, MCE and UE, wherein:
the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE;
MCE determines the sending mode of MBMS service, when determining to send MBMS service by simulcast SC-PTM mode, determines the configuration information of PDSCH sending MBMS service, and sends the information needed by MBMS service receiving to corresponding eNodeB by special signaling;
eNodeB establishes connection with MBMS GW according to the configuration information of transmission network layer in the special signaling, and receives MBMS service data from MBMS GW;
the eNodeB determines the control information of the service on the SC-MCCH according to the PDSCH configuration information in the special signaling, and broadcasts the control information of the MBMS service to the UE through the SC-MCCH;
the eNodeB adopts a corresponding MCS to send the PDSCH and a corresponding pilot signal in a corresponding simulcast bandwidth of a corresponding simulcast subframe according to the PDSCH configuration information in the special signaling;
the UE monitors SC-MCCH of corresponding cell, obtains control information of MBMS service transmitted in simulcast SC-PTM mode, and receives corresponding MBMS service according to the information.
According to the technical scheme, in the transmission method and the system for the control plane information in the simulcast SC-PTM system, the simulcast SC-PTM capability information of each cell is reported to the MCE through the eNodeB; when the MCE determines to send the MBMS in a simulcast SC-PTM mode, determining the configuration information of a PDSCH for sending the MBMS, and sending the information required by the MBMS receiving to a corresponding eNodeB through a special signaling; then, the eNodeB broadcasts configuration information to the UE through an SC-MCCH according to the information in the special signaling, and adopts a corresponding MCS to send a PDSCH and a corresponding pilot signal in a corresponding bandwidth of a corresponding simulcast subframe; and finally, the UE monitors the SC-MCCH of the corresponding cell to acquire the control information and the service data of the MBMS service transmitted in a simulcast SC-PTM mode. By applying the technical scheme disclosed by the application, the related functions in the simulcast SC-PTM mode can be realized among the related network elements.
Drawings
Fig. 1 is a flow chart illustrating a transmission method of control plane information in the simulcast SC-PTM system of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
In order to realize the sending of MBMS service in the simulcast SC-PTM mode, the invention provides a transmission method of control plane information in a simulcast SC-PTM system, which comprises the following steps:
the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE;
MCE determines the sending mode of MBMS service, when determining to send MBMS service by simulcast SC-PTM mode, determines the configuration information of PDSCH sending MBMS service, and sends the information needed by MBMS service receiving to corresponding eNodeB by special signaling;
eNodeB establishes connection with MBMS GW according to the configuration information of transmission network layer in the special signaling, and receives MBMS service data from MBMS GW;
the eNodeB determines the control information of the service on the SC-MCCH according to the PDSCH configuration information in the special signaling, and broadcasts the configuration information of the MBMS service to the UE through the SC-MCCH;
the eNodeB transmits the PDSCH and a corresponding pilot signal by adopting a corresponding MCS in a corresponding bandwidth of a corresponding simulcast subframe according to the PDSCH configuration information in the special signaling;
the UE monitors SC-MCCH of corresponding cell, obtains control information of MBMS service transmitted in simulcast SC-PTM mode, and receives corresponding MBMS service according to the information.
Corresponding to the above method, the present application also discloses a transmission system of control plane information in a simulcast SC-PTM system, which comprises: eNodeB, MCE and UE, wherein:
the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE;
MCE determines the sending mode of MBMS service, when determining to send MBMS service by simulcast SC-PTM mode, determines the configuration information of PDSCH sending MBMS service, and sends the information needed by MBMS service receiving to corresponding eNodeB by special signaling;
eNodeB establishes connection with MBMS GW according to the configuration information of transmission network layer in the special signaling, and receives MBMS service data from MBMS GW;
the eNodeB determines the control information of the service on the SC-MCCH according to the PDSCH configuration information in the special signaling, and broadcasts the control information of the MBMS service to the UE through the SC-MCCH;
the eNodeB transmits the PDSCH and a corresponding pilot signal by adopting a corresponding MCS in a corresponding bandwidth of a corresponding simulcast subframe according to the PDSCH configuration information in the special signaling; data of corresponding MBMS service is loaded on the PDSCH;
the UE monitors SC-MCCH of corresponding cell, obtains control information of MBMS service transmitted in simulcast SC-PTM mode, and receives corresponding MBMS service according to the information.
The technical solution of the present application is further described in detail by a preferred embodiment.
Fig. 1 is a flowchart of a transmission method for control plane information in a simulcast SC-PTM system according to the present application, where control plane processing that needs to be performed by an MCE, an eNodeB, and a UE having simulcast SC-PTM capability includes:
step 101: and in the process of establishing the M2 interface, the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE.
Specifically, the eNodeB sends a dedicated signaling to the MCE, where the signaling carries: PLMN ID, eNodeB name, MBMS service related configuration information of each cell with simulcast SC-PMT capability. Preferably, the dedicated signaling is an M2SETUP REQUEST message (M2 SETUP REQUEST). The eNodeB carries MBMS service related configuration information of each cell with simulcast SC-PTM capability through the signaling.
The MBMS service related configuration information of each cell with the simulcasting SC-PTM capability comprises the following steps: PLMN ID of the cell, ID of MBSFN synchronous area where the cell is located, ID of each MBMS service area where the cell belongs and indication that the cell supports simulcasting SC-PTM. If agreed in the 3GPP protocol: the CRS of each cell is still transmitted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM, and the MBMS service related configuration information of each cell with the simulcast SC-PTM capability further includes: the number of antenna ports for which the cell transmits CRS, and the physical layer cell ID of the cell (or the physical layer cell ID modulo a value of 6). The number of antenna ports on which the cell transmits the CRS and the physical layer cell ID of the cell (or the value of the physical layer cell ID modulo 6) determine the RE position within the simulcast bandwidth to which the CRS is mapped by the cell. The PDSCH needs to avoid REs occupied by CRSs of each cell in the simulcast region in RE mapping.
Step 102: after receiving the dedicated signaling sent by the eNodeB, the MCE stores each IE in the dedicated signaling, and feeds back a response message to the eNodeB, where the response message carries: PLMN ID, MCE ID, and name of MCE. Preferably, if the eNodeB sends the M2setup request message to the MCE in step 101, the response message is: m2SETUP RESPONSE message (M2 SETUP RESPONSE).
Step 103: when the MCE receives an MBMS SESSION START REQUEST message (MBMS SESSION START REQUEST) from the MME, the MCE determines the transmission mode of the MBMS SESSION specified in the message. When the MCE determines to transmit the MBMS session in the simulcast SC-PTM manner, step 104 is performed.
Specifically, there are three transmission modes for one MBMS session: MBSFN mode, SC-PTM mode and simulcast SC-PTM mode. The MCE determines each cell for transmitting the session according to the service area IE of the session in the MBMS session starting request message received from the MME, and selects one transmission mode from three transmission modes according to the MBMS service related configuration information of each cell obtained from each eNodeB. The information carried in the MBMS session start request message sent by the MCE to the eNodeB in different sending modes is different.
A method for determining the MBMS session transmission mode comprises the following steps:
if the MCE finds that the session is transmitted by each cell in one MBSFN area, the MBSFN scheme may be selected.
If the MCE finds that the session is sent in a plurality of adjacent cells, and the MCE finds that the session is sent in the plurality of adjacent cells according to MBMS relevant configuration information of each cell reported by each eNodeB: these cells all support simulcast SC-PTM, then the MCE can select the simulcast SC-PTM mode.
If the MCE finds that the session is sent in a plurality of adjacent cells, the MCE finds, according to the MBMS service related configuration information of each cell reported by each eNodeB: the cells do not all support simulcast SC-PTM, and the MCE may select SC-PTM mode.
If the MCE finds that the session is transmitted in several non-adjacent cells, the SC-PTM scheme may be selected.
Step 104: the MCE sends an MBMS SESSION START REQUEST message (MBMS SESSION START REQUEST) to the corresponding eNodeB. The message carries: and transmitting a cell ID list of the MBMS SESSION, the identification 'TMGI' of the MBMS service, the MBMS SESSION ID, the MBMS service area and TNL (transport network layer) information in a simulcast SC-PTM mode. Wherein the TNL information includes: the IP multicast address, IP source address and GTP DL TEID (GTP downlink tunnel endpoint identification) of the MBMS session. If agreed in the 3GPP protocol: the CRS of each cell is still transmitted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM, and the message also needs to carry: and configuration information of CRS mapping patterns in the simulcast region.
In the 3GPP protocol, a mapping pattern from CRS to REs of a cell is defined when the number of antenna ports for transmitting CRS is N and the value of physical layer cell ID modulo 6 is M. Wherein N is 1, 2 and 4, and M is 0, 1, 2, 3, 4 and 5. Therefore, the configuration information of the CRS mapping pattern in the simulcast region includes: in a cell which adopts 1 antenna port to transmit CRS in a simulcast region, all values of a physical layer cell ID module 6 are taken; in a cell which adopts 2 antenna ports to transmit CRS in a simulcast region, all values of a physical layer cell ID module 6 are taken; in a cell which adopts 4 antenna ports to transmit CRS in a simulcast region, all values of ID modulo 6 of a physical layer cell are obtained. The eNodeB can determine REs occupied by CRSs transmitted by each cell in the simulcast bandwidth according to the information, and needs to avoid these REs in the RE mapping of the PDSCH.
Step 105: after receiving the MBMS SESSION START REQUEST message (MBMS SESSION START REQUEST), the eNodeB stores each IE in the message, and adds the IP multicast address of the MBMS SESSION through the M1 interface according to the TNL information IE in the message, so as to receive the data of the SESSION from the MBMS GW. Meanwhile, the eNodeB feeds back an MBMS SESSION START RESPONSE message (MBMS SESSION START RESPONSE) to the MCE.
Step 106: the MCE allocates G-RNTI and PDSCH resources to the MBMS conversation transmitted in a simulcast SC-PTM mode, determines SC-MCCH Update Time (SC-MCCH Update Time), and transmits the G-RNTI, PDSCH resource configuration information and SC-MCCH Update Time (SC-MCCH Update Time) of the conversation to corresponding eNodeBs through a special signaling.
Specifically, to distinguish different MBMS sessions at the Uu interface, the MCE allocates a G-RNTI to the session. The MCE allocates PDSCH resources for the current MBMS session according to MBMS E-RAB QoS parameters IE (MBMS E-RAB QoS parameters) in the MBMS session starting request message from the MME, and determines the configuration information of the PDSCH resources according to the allocated PDSCH resources so that the eNodeB receives the corresponding PDSCH according to the configuration information of the PDSCH resources. Preferably, the PDSCH resource configuration information includes: sending period T of PDSCH, radio frame offset, simulcast subframe number set, simulcast bandwidth and MCS. The simulcast bandwidth is represented by a start RB number and a termination RB number, or by a start RB number and the number of RBs allocated consecutively.
The MCE determines SC-MCCH Update Time (SC-MCCH Update Time) so that the eNodeB determines the starting Time for transmitting the control information of the MBMS session through the SC-MCCH according to the parameter.
Preferably, the dedicated signaling employed by the MCE is: and an MBMS SCHEDULING INFORMATION (MBMS SCHEDULING INFORMATION) message, wherein the MCE sends the G-RNTI, the PDSCH resource configuration INFORMATION and SC-MCCH Update Time (SC-MCCH Update Time) of the MBMS session to the eNodeB through the message.
When MBMS service is transmitted in MBSFN mode or SC-PTM mode, MCE does not need to carry PDSCH resource configuration information in dedicated signaling, therefore, when PDSCH resource configuration information is carried in dedicated signaling (MBMS scheduling information message), eNodeB determines that corresponding MBMS service is transmitted in simulcast SC-PTM mode according to the information.
Step 107: after receiving the dedicated signaling sent by the MCE, the eNodeB saves each IE in the dedicated signaling, and feeds back a response message to the MCE.
Preferably, the response message fed back by the eNodeB is: MBMS scheduling information response message.
Step 108: and the eNodeB determines the control information of the MBMS session on the SC-MCCH according to the stored G-RNTI and PDSCH resource configuration information of the MBMS session, and determines the initial modification period for transmitting the control information of the MBMS session through the SC-MCCH according to the SC-MCCH updating time.
Specifically, the control information of the MBMS session on the SC-MCCH includes the following:
(1) Simulcast SC-PTM indication: the indication is used to indicate that the MBMS session is transmitted in a simulcast SC-PTM manner.
When the eNodeB receives the PDSCH resource configuration information in the dedicated signaling sent by the MCE in step 107, the eNodeB determines that the corresponding MBMS service is sent in the simulcast SC-PTM manner. Therefore, the eNodeB sends the simulcast SC-PTM indication on the SC-MCCH so as to indicate the MBMS service to the UE to be sent in a simulcast SC-PTM mode.
(2) TMGI, SESSION ID and G-RNTI for the MBMS SESSION.
The eNodeB obtains the TMGI and SESSION ID of the MBMS SESSION from the MBMS SESSION start request message sent by the MCE in step 105.
(3) PDSCH configuration information, preferably, the information includes: the sending period T of the PDSCH, the radio frame offset, the simulcast subframe number set, the simulcast bandwidth and the MCS.
(4) Neighbor cell list: the list provides frequency bins and physical layer cell IDs for each neighbor cell. When a neighboring cell has the same frequency as the current cell, the frequency point of the neighboring cell does not need to be provided.
(5) The neighbor cell list for the MBMS session is sent in a simulcast SC-PTM manner. Preferably, the list may correspond to a character string, and the character string includes a number of bits equal to the number of neighbor cells in the neighbor cell list. Each bit in the character string respectively corresponds to one adjacent cell in the adjacent cell list according to the left-to-right sequence. For any bit in the string, the bit is 1 or 0, and is used to indicate the corresponding neighboring cell to broadcast the MBMS session or not to broadcast the MBMS session in a simulcast SC-PTM manner, respectively.
The eNodeB determines the value of each bit in the character string according to the cell ID list that is obtained from the MBMS session start request message sent by the MCE in step 105 and that sends the MBMS session in the simulcast SC-PTM manner.
(6) And configuration information of CRS mapping patterns in the simulcast region. The configuration information is optional information, and when the following is agreed in the 3GPP protocol: when the CRS of each cell is still transmitted within the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM, the configuration information needs to be included.
Here, the configuration information of the CRS mapping pattern in the simulcast region is the same as the configuration information of the CRS mapping pattern in the simulcast region in the MBMS session start request message transmitted by the MCE in step 104.
Step 109: the eNodeB determines each cell which transmits the corresponding MBMS session in a simulcast SC-PTM mode in the cells controlled by the eNodeB according to the cell ID list which transmits the MBMS session in the simulcast SC-PTM mode in the MBMS session starting request message transmitted by the MCE. For each determined cell, the eNodeB determines the resource of the cell for sending the SC-MCCH and the resource for sending the SC-MCCH modification notification, and broadcasts the scheduling information of the SC-MCCH and the SC-MCCH modification notification through the SIB20, so that the UE can receive the SC-MCCH and the SC-MCCH modification notification.
Step 110: and the eNodeB adopts the determined SC-MCCH resources to send the SC-MCCH for bearing the control information of the MBMS conversation in each determined cell from the determined initial modification period. And meanwhile, in the scene of meeting the requirement of sending the SC-MCCH change notification, the eNodeB sends the corresponding SC-MCCH change notification by adopting the determined resources of the SC-MCCH change notification.
Here, the control information of the MBMS session transmitted on the SC-MCCH in each cell is the same, but the transmission subframe of the SC-MCCH and the information content carried on the SC-MCCH may be different in different cells. Such as: the cell 1 and the cell 2 respectively transmit the same MBMS service in a simulcast SC-PTM mode, the SC-MCCH in the cell 1 only carries control information of 2 MBMS sessions, the SC-MCCH is transmitted in a radio frame with the offset of 0 in each period with the length of 40ms, the SC-MCCH in the cell 2 carries control information of 4 MBMS sessions, and the SC-MCCH is transmitted in a radio frame with the offset of 2 in each period with the length of 40 ms. Typical scenarios for sending the SC-MCCH change notification are: the SC-MCCH is provided with control information of a newly added MBMS session. And in the scene of meeting the requirement of sending the SC-MCCH change notification, the eNodeB sends the SC-MCCH change notification through the determined resources of the SC-MCCH change notification.
Step 111: the eNodeB receives the MBMS session data from the MBMS GW via the M1 interface, determines the subframes for transmitting the MBMS session (these subframes are referred to as simulcast subframes in the present invention) according to the PDSCH configuration information in the dedicated signaling transmitted by the MCE in step 106, and transmits the corresponding PDSCH within the simulcast bandwidth using the MCS in the determined simulcast subframes for transmitting the MBMS session in each cell. The scrambling sequence generator is initialized with the G-RNTI in bit scrambling of PDSCH in simulcast SC-PTM.
If agreed in the 3GPP protocol: the CRS of each cell is still transmitted within the simulcast bandwidth where PDSCH is located in the simulcast SC-PTM, and the eNodeB also needs to avoid REs occupied by CRS of each cell within the simulcast bandwidth when performing RE mapping of PDSCH according to the configuration information of CRS mapping patterns within the simulcast area in the MBMS session start request message transmitted by MCE.
If agreed in the 3GPP protocol: and if the dedicated pilot frequency is adopted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM for demodulating the PDSCH, sending the corresponding dedicated pilot frequency in the simulcast bandwidth where the PDSCH is located, and avoiding the RE occupied by the dedicated pilot frequency when RE mapping of the PDSCH is executed. If each cell in the simulcast region in the simulcast bandwidth also transmits the CRS, the REs occupied by the CRS need to be avoided in the mapping of the dedicated pilot.
Step 112: and the UE with the simulcast SC-PTM capability receives the SC-MCCH according to the scheduling information of the SC-MCCH on the SIB20 in a resident cell or a cell establishing RRC connection, and receives the corresponding MBMS session according to the control information of the MBMS session on the SC-MCCH. The UE may also receive the SC-MCCH change notification according to the scheduling information of the SC-MCCH change notification on the SIB 20.
Specifically, the UE receives SIB20 of a corresponding cell to obtain scheduling information of SC-MCCH in the cell, receives the corresponding SC-MCCH according to the scheduling information, obtains control information of a corresponding MBMS session from the SC-MCCH, determines each subframe for sending PDSCH according to the period of PDSCH in PDSCH configuration information in the control information, radio frame bias and simulcast subframe set, receives PDSCH in each corresponding subframe, and decodes the PDSCH according to G-RNTI, simulcast bandwidth and MCS in the control information to obtain data of the MBMS session on the PDSCH.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (9)
1. A method for transmitting control plane information in a simulcast SC-PTM system is characterized by comprising the following steps:
the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE;
MCE determines the sending mode of MBMS service, when determining to send MBMS service by simulcast SC-PTM mode, determines the configuration information of PDSCH sending MBMS service, and sends the information needed by MBMS service receiving to corresponding eNodeB by special signaling;
eNodeB establishes connection with MBMS GW according to the transmission network layer configuration information in the special signaling, and receives MBMS service data from MBMS GW;
the eNodeB determines the control information of the service on the SC-MCCH according to the PDSCH configuration information in the special signaling, and broadcasts the control information of the MBMS service to the UE through the SC-MCCH;
the eNodeB transmits the PDSCH and a corresponding pilot signal by adopting a corresponding MCS in a corresponding simulcast bandwidth of a corresponding simulcast subframe according to the PDSCH configuration information in the special signaling;
the UE monitors SC-MCCH of a corresponding cell, acquires control information of the MBMS sent in a simulcast SC-PTM mode, and receives the corresponding MBMS according to the information;
wherein, the MCE sending the information required for receiving the MBMS service to the corresponding eNodeB through dedicated signaling includes: the MCE sends an MBMS conversation starting request message to a corresponding eNodeB, wherein the MBMS conversation starting request message carries: sending a cell ID list of the MBMS SESSION, an identifier TMGI of the MBMS service, an MBMS SESSION ID, an MBMS service area and TNL information of a transport network layer in a simulcast SC-PTM mode; the TNL information includes: the IP multicast address, IP source address and GTP DL TEID of the MBMS conversation;
if agreed in the 3GPP protocol: the CRS of each cell is still transmitted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM, and then the MBMS session start request message also carries: and configuration information of CRS mapping patterns in the simulcast region.
2. The method of claim 1, wherein:
the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE through the M2 establishment request message in the M2 interface establishment process, or reports the simulcast SC-PTM capability information of each cell to the MCE through a special signaling;
the M2setup request message or the dedicated signaling carries: PLMN ID, eNodeB name, MBMS service related configuration information of each cell with simulcast SC-PMT capability.
3. The method of claim 2, wherein:
the MBMS service related configuration information of each cell with the simulcast SC-PMT capability comprises: PLMN ID of the cell, ID of MBSFN synchronization area where the cell is located, ID of each MBMS service area where the cell belongs and indication that the cell supports simulcasting SC-PTM;
if agreed in the 3GPP protocol: the CRS of each cell is still transmitted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM, and the MBMS service related configuration information of each cell with the simulcast SC-PTM capability further includes: the number of antenna ports for which the cell transmits CRS and the physical layer cell ID of the cell or the value of physical layer cell ID modulo 6.
4. The method of claim 1, wherein:
the MCE determines the configuration information of the PDSCH for sending the MBMS service, and the configuration information comprises the following steps: and determining the sending period T, the radio frame offset, the simulcast subframe number set, the simulcast bandwidth and the MCS of the PDSCH.
5. The method of claim 4, further comprising:
the MCE allocates G-RNTI and PDSCH resources to the MBMS session transmitted in a simulcast SC-PTM mode, determines SC-MCCH updating time and transmits the SC-MCCH updating time to the eNodeB.
6. The method of claim 5, further comprising:
and the eNodeB determines the control information of the MBMS session on the SC-MCCH according to the G-RNTI and PDSCH resource configuration information of the MBMS session, and determines the initial modification period for transmitting the control information of the MBMS session through the SC-MCCH according to the SC-MCCH updating time.
7. The method of claim 6, wherein the control information for the MBMS session on the SC-MCCH comprises:
simulcast SC-PTM indication: the indication is used for indicating that the MBMS conversation adopts a simulcasting SC-PTM mode;
TMGI, SESSION ID and G-RNTI of MBMS SESSION;
PDSCH configuration information, including: a sending period T of the PDSCH, a wireless frame offset, a simulcast subframe number set, a simulcast bandwidth and an MCS;
neighbor cell list: the list provides the frequency point and physical layer cell ID of each neighbor cell;
sending the adjacent cell list of the MBMS conversation in a simulcast SC-PTM mode;
and configuration information of CRS mapping patterns in the simulcast region.
8. The method according to any one of claims 1 to 7, wherein:
if agreed in the 3GPP protocol: the method comprises the steps that CRSs of all cells are still sent in a simulcast bandwidth where a PDSCH is located in a simulcast SC-PTM, and an eNodeB also needs to avoid REs occupied by the CRSs of all the cells in the simulcast bandwidth when RE mapping of the PDSCH is executed according to configuration information of CRS mapping patterns in the simulcast area in an MBMS session starting request message sent by an MCE;
if agreed in the 3GPP protocol: the method comprises the steps that a special pilot frequency is adopted in a simulcast bandwidth where a PDSCH is located in a simulcast SC-PTM for demodulating the PDSCH, then the corresponding special pilot frequency is sent in the simulcast bandwidth where the PDSCH is located, and when RE mapping of the PDSCH is executed, REs occupied by the special pilot frequency need to be avoided;
if CRS is transmitted by each cell in the simulcast region in the simulcast bandwidth, REs occupied by CRS need to be avoided in the mapping of the dedicated pilot.
9. A system for transmitting control plane information in a simulcast SC-PTM system, the system comprising: eNodeB, MCE and UE, wherein:
the eNodeB reports the simulcast SC-PTM capability information of each cell to the MCE;
MCE determines the sending mode of MBMS service, when determining to send MBMS service in simulcast SC-PTM mode, determines the configuration information of PDSCH sending MBMS service, and sends the information needed by MBMS service receiving to corresponding eNodeB through dedicated signaling;
eNodeB establishes connection with MBMS GW according to the transmission network layer configuration information in the special signaling, and receives MBMS service data from MBMS GW;
the eNodeB determines the control information of the service on the SC-MCCH according to the PDSCH configuration information in the special signaling, and broadcasts the control information of the MBMS service to the UE through the SC-MCCH;
the eNodeB transmits the PDSCH and a corresponding pilot signal by adopting a corresponding MCS in a corresponding simulcast bandwidth of a corresponding simulcast subframe according to the PDSCH configuration information in the special signaling;
the UE monitors SC-MCCH of a corresponding cell, acquires control information of the MBMS sent in a simulcast SC-PTM mode, and receives the corresponding MBMS according to the information;
the MCE sending information required for receiving the MBMS service to a corresponding eNodeB through dedicated signaling includes: the MCE sends an MBMS conversation starting request message to a corresponding eNodeB, wherein the MBMS conversation starting request message carries: sending a cell ID list of the MBMS conversation, an identification TMGI of the MBMS service, an MBMS SESSIONID, an MBMS service area and TNL information of a transport network layer in a simulcast SC-PTM mode; the TNL information includes: the IP multicast address, IP source address and GTP DL TEID of the MBMS conversation;
if agreed in the 3GPP protocol: the CRS of each cell is still transmitted in the simulcast bandwidth where the PDSCH is located in the simulcast SC-PTM, and then the MBMS session start request message also carries: and configuration information of CRS mapping patterns in the simulcast region.
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| CN113498023B (en) * | 2020-04-02 | 2022-08-23 | 成都鼎桥通信技术有限公司 | MBMS receiving and sending method, device, equipment and storage medium |
| CN113950147B (en) * | 2020-07-17 | 2023-05-09 | 成都鼎桥通信技术有限公司 | Method and equipment for sending SC-PTM configuration information in NR (radio network controller) cell |
| CN113950148B (en) * | 2020-07-17 | 2023-08-15 | 成都鼎桥通信技术有限公司 | Broadcast method and system of SC-MCCH (broadcast multicast control channel) |
| CN114727230B (en) * | 2021-01-05 | 2023-08-29 | 成都鼎桥通信技术有限公司 | Information transmission method and device |
| CN114765493B (en) * | 2021-01-12 | 2023-11-21 | 上海交通大学 | Method, receiving end, transmitting end and system for realizing service scheduling |
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