CN107734606B

CN107734606B - Method and device for transmitting multicast service

Info

Publication number: CN107734606B
Application number: CN201610956883.2A
Authority: CN
Inventors: 艾建勋; 戴博; 陈宪明; 余媛芳
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-08-12
Filing date: 2016-11-03
Publication date: 2023-09-01
Anticipated expiration: 2036-11-03
Also published as: CN107734606A

Abstract

The invention discloses a method and a device for transmitting multicast service, wherein the method comprises the following steps: the network element of the access network dispatches the transmission of MBMS business data packet carried by the multicast transmission channel SC-MTCH for N times at the wireless interface; n is an integer greater than or equal to 2.

Description

Method and device for transmitting multicast service

Technical Field

The present invention relates to the internet of things, and in particular, to a method and apparatus for transmitting a multicast service.

Background

In the long term evolution (3GPP LTE,3rd Generation Partnership Project Long Term Evolution) system of the third generation partnership project, a Single Cell point-To-Multipoint (SC-PTM, single Cell Point-To-Multipoint) transmission technique is introduced, and the SC-PTM technique is used To implement a downlink multimedia broadcast multicast (MBMS, multimedia Broadcast Multicast Service) service for transmitting point-To-Multipoint in a Single Cell. SC-PTM introduces two logical channels, namely a Single Cell multicast control channel (SC-MCCH, single Cell-Multicast Control Channel) and a Single Cell multicast transport channel (SC-MTCH, SC-MCCH, single Cell-Multicast Traffic Channel). In LTE, both the SC-MCCH and SC-MTCH are carried over the physical downlink shared channel (PDSCH, physical Downlink Shared Channel).

The SC-MCCH channel carries control information related to MBMS service transmission, including service identification, scheduling information, and the like. In LTE, PDSCH carrying SC-MCCH is dynamically scheduled. Specifically, the scheduling information of the SC-MCCH channel is indicated in a system message block 20 (SIB 20), including a modification period, a repetition period, an offset (offset), a first subframe (first subframe), and a section length duration that may be scheduled. These parameters define the interval of the duration that the SC-MCCH may be scheduled, i.e. the eNB schedules the SC-MCCH in a certain subframe in the duration of the duration that the SC-MCCH may be scheduled.

The modification period of the SC-MCCH indicates a boundary where the SC-MCCH message may be modified, the SC-MCCH repetition period is a period in which the SC-MCCH message is scheduled to be sent, and offset refers to the number of offset radio frames of the duration starting radio frame relative to the SC-MCCH repetition period starting radio frame, and the first subframe is the duration from which radio subframe in the starting radio frame starts. The Duration is the number of radio subframes for which the Duration is continuous. The eNB uses the SC-RNTI to scramble DCI in the physical downlink control channel PDCCH.

In LTE, one SC-MTCH carries service data of one MBMS. The scheduling information of the SC-MTCH includes: the period and the start offset, the length of duration time period onduration timer that may be scheduled, and the length of time the UE (User Equipment) waits after successfully receiving a downlink data (drxinactigytimer scptm).

As shown in fig. 1, the eNB may schedule an SC-MTCH channel carrying a certain MBMS service in any radio subframe in the resources specified by the SC-MTCH scheduling information, and after the UE successfully receives one downlink data of the service, start or restart a timer with a drxinactigityimterscpm length, and continue waiting for the above-mentioned drxinactigityimterscpm time length until the time expires or a new downlink data of the service is received. The eNB scrambles downlink control information (DCI, downlink Control Information) of physical downlink control channel (PDCCH, physical Downlink Control Channel) signaling scheduling SC-MTCH using an allocated radio network temporary identity (G-RNTI), and each MBMS service is allocated a dedicated G-RNTI.

In order to enhance the reception of covered UEs in narrowband internet of things (NB-IoT, narrow Band Internet of Thing) and LTE-enhanced machine type communication (eMTC, enhanced Machine Type Communication), the same PDCCH signaling and PDSCH channel data needs to be repeated multiple times, as shown in fig. 2. In PDCCH signaling for scheduling PDSCH, in addition to indicating the time-domain frequency-domain resource and modulation coding format MCS used for PDSCH channel, the number of repeated transmissions of PDSCH (Repetition number) and the starting point of time for scheduling PDSCH transmission, that is, scheduling delay, are indicated, and in the prior art, this scheduling timing refers to the number of radio subframes after the last PDCCH subframe starts scheduling corresponding PDSCH.

How to support SC-PTM in NB-IoT or eMTC has the following problems.

The main purpose of introducing SC-PTM by NB-IoT and eMTC is to provide an efficient point-to-multipoint transmission technology, which is mainly used for massive UE to update the software or firmware thereof, and avoid massive UE from acquiring the service data through a dedicated channel (dedicated channel). Such traffic obviously requires 100% correct and reliable reception of traffic data, otherwise the received part of the traffic data has no practical significance. The current service transmission method cannot guarantee the complete and accurate reception of the data. Therefore, it is needed to provide a technical solution capable of ensuring that the UE can accurately receive the downlink data.

Disclosure of Invention

In order to solve the technical problems, the embodiment of the invention provides a method and a device for transmitting multicast service.

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

a method of transmitting multicast traffic, the method comprising:

the network element of the access network dispatches the transmission of MBMS business data packet carried by the multicast transmission channel SC-MTCH for N times at the wireless interface; n is an integer greater than or equal to 2.

In the embodiment of the invention, the method further comprises the following steps:

and when the access network element schedules the transmission of the MBMS data packet, the repeated scheduling information for scheduling the MBMS data packet is indicated to a receiver.

In the embodiment of the present invention, the repeated scheduling information includes at least one of the following information:

and the sequence number of the current scheduling is the number of the remaining scheduling times of the MBMS data packet, and the number of the MBMS data packet.

and numbering the MBMS data packets, wherein the numbering of the MBMS data packets is circularly used in a numbering range.

and the access network element informs the receiver of the times N of the MBMS data packet scheduling through a system message or a multicast control channel SC-MCCH message.

In the embodiment of the invention, the scheduling includes repeated transmission of a Physical Downlink Control Channel (PDCCH) for M1 times and repeated transmission of a Physical Downlink Shared Channel (PDSCH) for M2 times aiming at the MBMS data packet; m1 and M2 are both less than or equal to N.

In the embodiment of the present invention, the scheduling N times of transmission of the MBMS service data packet at the radio interface includes:

for one MBMS service data packet, the access network element continuously schedules the MBMS service data packet for N times.

In the embodiment of the invention, the repeated scheduling information is indicated by a Physical Downlink Control Channel (PDCCH) signaling for scheduling the MBMS data packet.

A method for transmitting multicast service, the method comprising:

and the User Equipment (UE) receives the SC-MTCH data packet sent by the network element of the access network according to the repeated scheduling information of each MBMS data packet.

In the embodiment of the invention, the method further comprises the following steps: and when the UE successfully receives one MBMS service data packet, the UE does not receive the subsequent repeated scheduling of the MBMS service data packet, and when the UE fails to receive the MBMS service data packet, the UE always receives the subsequent repeated scheduling of the MBMS service data packet until the MBMS service data packet is successfully received or detects the scheduling of a new MBMS service data packet.

A method for transmitting a service, the method comprising:

the access network element configures a multiple transmission period MTP for the transmission channel and schedules one or more specific service data packets at a time in said MTP.

In the embodiment of the present invention, the MTP configured for the transmission channel includes one or more of the following combinations of information: length information of the MTP;

the length information of the MTP and the offset information of the starting position of the MTP; and repeatedly transmitting the frequency information of the specific MBMS data packet at the MTP.

In the embodiment of the present invention, the offset of the starting position of the MTP is calculated by the following formula:

(H-SFN×1024+SFN)mod L＝offset；

Wherein, H-SFN is the system super frame number, SFN is the system frame number, mod is the modulo operation, L is the length of MTP, and offset is the offset of the starting position of MTP.

and when the access network element schedules the specific service data packet in the MTP, scheduling the same specific service data packet in one MTP, and performing one or more times of scheduling.

In the embodiment of the present invention, the scheduling of the specific MBMS service data packet in the one MTP includes:

the specific MBMS data packet is scheduled for multiple times in one MTP; alternatively, the specific MBMS service data packet is scheduled in a plurality of continuous or discontinuous MTPs.

A method for transmitting a service, the method comprising:

the UE receives one or more schedules of service data packets in one or more MTPs for scheduling the service data packets

when multiple schedules of one service data packet are all in the same MTP, and one MTP only schedules the same service data packet once or multiple times, the UE judges that the service data packets scheduled in different MTPs are different service data packets according to the boundary of the MTP.

when the access network element indicates the number of times of scheduling the specific service data packet in one MTP, the number of times of receiving the specific service data packet in one MTP by the UE does not exceed the indicated number of times.

when the transmission channel adopts dynamic scheduling, the UE receives a PDCCH channel in the MTP to detect PDCCH signaling DCI for scheduling the transmission channel; and receiving a PDSCH channel carrying service data indicated by the DCI according to the received PDCCH signaling DCI for scheduling the transmission channel.

when a transmission channel is configured with a scheduling period, the UE receives a PDCCH channel at a designated position in the scheduling period of the transmission channel in the MTP to detect and schedule the transmission channel PDCCH signaling DCI.

A method for transmitting a service, the method comprising:

the access network element indicates the scheduling information of one or more transmissions of the specific service data packet through the dynamic scheduling signaling, so that the UE receives the specific service data packet according to the dynamic scheduling signaling.

In the embodiment of the present invention, the scheduling of the one or more transmissions includes:

One or more transmissions of the same specific service data packet are made in the radio interface.

and the physical channel data carrying the specific service data packet is repeatedly transmitted for a plurality of times on the wireless interface.

In the embodiment of the present invention, the scheduling information indicated in the dynamic scheduling signaling includes one of the following contents:

the method comprises the steps of transmitting initial position information of one or more times, wherein the initial position information is the combination of a system super frame number H-SFN and a system frame number SFN; or the relative time interval size relative to the starting or ending time of the dynamic scheduling signaling; or the time interval between the starting position of the latter transmission and the starting position of the former transmission;

the number of the transmissions and the time interval between each transmission are the starting position or the ending position of the two transmissions.

In the embodiment of the invention, the scheduling information also comprises frequency domain resource information used by each transmission; the frequency domain resource information includes at least one of the following information: the frequency of the carrier wave used by the transmission, the indication of whether to carry out frequency hopping transmission, and the information of the physical resource block PRB used by the transmission.

In the embodiment of the present invention, the scheduling information further includes information of the number of times that physical channel data carrying a specific service data packet is repeatedly transmitted at the radio interface in one or more transmissions.

In the embodiment of the present invention, the start position or the end position is the position of the first or last radio frame or radio subframe used for the transmission.

A method for transmitting a service, the method comprising:

and the UE receives one or more transmissions of the specific service data packet according to the dynamic scheduling signaling sent by the access network element.

and the UE starts to respectively receive one or more transmissions of the specific MBMS data packet at the starting position of the one or more transmissions.

A method of transmitting multicast traffic, the method comprising:

the access network element confirms the feedback condition of the UE on the received service or the service interested in receiving through signaling indication or protocol with the UE, so that the UE sends feedback information to the access network element according to the feedback condition.

In the embodiment of the present invention, the feedback condition includes at least one of the following: and feeding back threshold condition information and feedback limiting condition information.

In the embodiment of the present invention, the feedback threshold condition information includes at least one of the following:

the method comprises the steps of receiving failure rate threshold condition information, UE coverage level threshold condition information, receiving failure quantity threshold condition information and threshold condition information of completely receiving service data;

the feedback constraint information includes at least one of:

feedback time period limiting condition information, feedback probability limiting condition information, feedback time interval limiting condition information and feedback frequency limiting condition.

A method of transmitting multicast traffic, the method comprising:

the access network element indicates the scheduling parameters of the data packet of the UEMBMS through signaling, wherein the scheduling parameters comprise at least one of the following: the repetition factor, coverage class information and the receiving success rate/failure rate threshold used when the MBMS data packet is scheduled.

In the embodiment of the present invention, the coverage level information refers to a coverage level that the repetition factor can ensure a certain reception success rate, or refers to a threshold for reporting the coverage level of the UE by the UE.

In the embodiment of the present invention, the reception success rate/failure rate threshold refers to a success rate or failure rate of a MAC PDU received by the UE, or a success rate or failure rate of an RLC PDU received by the UE, or a success rate or failure rate of a PDCP PDU received by the UE when the UE receives the MBMS service data packet.

and when the access network element does not indicate the coverage grade information, the UE acquires the coverage grade information from the repetition factor and the mapping relation between the repetition factor and the coverage grade indicated by protocol convention or signaling.

In the embodiment of the invention, the access network element indicates the scheduling parameter through the SC-MCCH message, or a system information block SIB, or PDCCH DCI for scheduling the MBMS data packet.

In the embodiment of the present invention, the repetition factor is used to indicate the number of repeated transmissions on the radio interface when the transport block TB carrying the MBMS service packet is transmitted, and/or the number of repeated transmissions of the physical control channel signaling DCI when the transport block is scheduled.

A method of transmitting multicast traffic, the method comprising:

and comparing the first coverage grade information indicated by the network element of the access network with the second coverage grade information obtained by the UE through measurement when the MBMS is being received or the UE interested in the MBMS is received, and feeding back through a feedback mechanism if the second coverage grade information is greater than or equal to the first coverage grade information.

And when the UE receiving the MBMS determines that the receiving success rate or the failure rate reaches or exceeds the receiving success rate/failure rate threshold indicated by the access network, feeding back the UE through a feedback mechanism.

In the embodiment of the invention, the receiving success rate reaches or exceeds the threshold of the receiving success rate, which means that the actual receiving success rate of the UE is smaller than or equal to the threshold of the receiving success rate indicated by the network element of the access network;

the failure rate of receiving of the UE reaches or exceeds the threshold of failure rate of receiving, which means that the actual failure rate of receiving of the UE is larger than or equal to the failure rate of receiving indicated by the network element of the access network.

In an embodiment of the present invention, the feedback performed by the feedback mechanism includes:

the UE feeds back through a radio resource control protocol message, wherein the feedback content comprises at least one of the following: the feedback MBMS service identification information, the second coverage level information and the actual receiving success rate/failure rate of the UE;

or the UE feeds back the preamble of the random access channel appointed by the MBMS service and/or the appointed feedback time domain resource through the access network element.

A method of transmitting multicast traffic, the method comprising:

the access network element designates or agrees with feedback channel resources of feedback information for downlink scheduling transmission of the MBMS data packet;

And retransmitting the MBMS data packet after receiving feedback information of downlink scheduling transmission of the MBMS data packet on the feedback channel resource.

In the embodiment of the invention, the feedback information is feedback of one-time scheduling transmission of the MBMS data packet.

In the embodiment of the present invention, the feedback channel resources include at least one of the following resources:

the physical random access channel resource, the physical uplink shared channel PUSCH resource, the channel resource in the physical uplink public channel PUCCH, and the time domain resource for transmitting signals in the physical uplink shared channel, the physical uplink public channel and the physical random access channel.

In the embodiment of the present invention, the time domain resource includes at least one of the following resources:

relative to the relative time of the last PDSCH subframe in which the MBMS service data packet is transmitted, or the time domain resources at the N subframe intervals,

relative to the relative time of the last PDCCH subframe in which the MBMS service data packet is transmitted, or the time domain resources at N subframe intervals,

relative time of the first PDSCH subframe of the MBMS service data packet or time domain resources at N subframe intervals.

In the embodiment of the present invention, the retransmitting the MBMS service data packet includes:

The access network element resends the MBMS service data packet when the Mth scheduling is carried out after the MBMS service data packet is scheduled; m is a preset value; or alternatively, the process may be performed,

the access network element only schedules the transmission of the MBMS data packet once in each SC-MTCH scheduling period, and retransmits the MBMS data packet in the P scheduling period after the first scheduling; p is a preset value; or alternatively, the process may be performed,

the access network element schedules the transmission of the MBMS data packet for a plurality of times in each SC-MTCH scheduling period, and retransmits the data packet in the O scheduling period after the first scheduling; or alternatively, the process may be performed,

and the access network element resends the data packet after receiving the failure feedback information of the current scheduling.

when the access network element schedules the MBMS service data packet for the first time, the access network element indicates the MBMS service data packet to be transmitted for the first time, or indicates the number of the MBMS service data packet and is transmitted for the first time by scheduling PDCCH signaling or other signaling of the MBMS service data packet.

When the access network element reschedules the MBMS service data packet, the access network element indicates the MBMS service data packet to be retransmitted or indicates the number of the MBMS service data packet and retransmits the MBMS service data packet through dispatching PDCCH signaling or other signaling of the MBMS service data packet.

A method of transmitting multicast traffic, the method comprising:

the UE sends feedback information to the access network element according to feedback conditions sent by the access network element; the feedback conditions include at least one of: and feeding back threshold condition information and feedback limiting condition information.

and when the UE meets the following conditions, sending feedback information to the access network element:

the access network element sets or agrees with any one of the feedback threshold conditions through a protocol, and the UE meets at least one of the feedback threshold conditions;

the access network element sets or agrees with any one of the feedback limiting conditions, and the UE meets at least one of the feedback limiting conditions;

and the access network element sets feedback limit thresholds A and B, and the UE simultaneously meets the limit conditions A and B or the UE meets the limit conditions A or B.

A method of transmitting multicast traffic, the method comprising:

and the User Equipment (UE) receives control information of an access network element indicating the UE feedback service receiving state through a system information block or an SC-MCCH channel, and feeds back the state of the UE receiving service according to the control information of the feedback service receiving state.

In the embodiment of the invention, the control information of the feedback service receiving state is used for indicating whether the UE feeds back the MBMS service data packet successfully.

In an embodiment of the present invention, the control information includes: the identification information of the service needing to feed back the receiving state, or the control information comprises: the identification information of the service requiring feedback of the receiving state and at least one of the following information: the UE feeds back the used uplink resource information and the feedback probability factor.

In the embodiment of the present invention, the uplink resource information includes:

a preamble in a physical random access channel PRACH, and time domain information for transmitting the preamble, and the number of times of transmitting the preamble; or (b)

Channel resources in a Physical Uplink Common Channel (PUCCH) are designated, and time domain information of signals is sent in the PUCCH; or (b)

Designating time domain and frequency domain resource information in a Physical Uplink Shared Channel (PUSCH); transmitting repetition number information of the PUSCH signaling; or (b)

RRC message.

In an embodiment of the present invention, the time domain information includes at least one of the following information: absolute time, time indicated in the control information of the feedback service reception state, relative time with respect to transmission time of signaling of the control information of the feedback service reception state, and relative time with respect to stop time of the service requiring the feedback reception state.

A method of transmitting multicast traffic, comprising:

and the access network element receives the signaling indicating the information of the target User Equipment (UE) of the MBMS service data packet sent by the core network element, and dispatches and sends the MBMS service data packet on a wireless interface according to the information of the target UE.

In the embodiment of the present invention, the target UE information includes at least one of the following information:

the maximum value of the coverage grades of all target UE in a specific area of the MBMS service data packet;

average value of CEL of all target UE in a specific area of the MBMS service data packet;

the number of target UE corresponding to one or more CEL in a specific area of the MBMS service data packet;

the proportion of the UE corresponding to one or more CELs in a specific area of the MBMS service data packet;

The number of target UE of the MBMS data packet in a specific area;

and the identification information of a specific area with the number of the target UE of the MBMS data packet being larger than a threshold and/or the information of the number of the target UE in the specific area.

In the embodiment of the present invention, the specific area is a cell, a tracking area TA, or an MBMS service area.

A method of transmitting multicast traffic, the method comprising:

the access network element sends a feedback control message, where the feedback control message is used to indicate information of one or more MBMS service data packets in one or more synchronization sequences that are not received by the core network element.

In the embodiment of the invention, the feedback control message carries the identification information of the synchronous sequence; the identification information of the synchronization sequence comprises time stamp information of the synchronization sequence and identification information of the lost MBMS data packet in the synchronization sequence.

In the embodiment of the invention, the access network element feeds back the control message through the control plane message from the access network to the core network element or the newly added synchronous protocol control packet.

A method of transmitting multicast traffic, the method comprising:

The core network element receives a feedback control message sent by the access network element; wherein, the access network element does not receive the information of one or more MBMS service data packets in one or more synchronization sequences; the feedback control message carries the identification information of the synchronization sequence and the identification information of the lost MBMS data packet in the synchronization sequence.

In the embodiment of the invention, the feedback control message is sent through a control plane message from an access network to a core network element or a newly added synchronous protocol control packet.

In the embodiment of the present invention, the identification information of the MBMS service data packet is at least one of the following:

the list and the number of MBMS service data packet identifiers which are not received by the access network element are the serial numbers of the MBMS service data packets in a synchronous sequence;

and the starting MBMS data packet identification and the number of the MBMS data packets which are not continuously received by taking the starting MBMS data packet as a starting point.

and the core network element resends the MBMS data packet which is not received by the access network based on the received feedback control message.

In the embodiment of the invention, when the core network element resends the MBMS service data packet which is not received by the access network, the timestamp information and the packet quantity information of the MBMS service data packet to be sent are respectively set as the timestamp and the packet quantity of the MBMS service data packet to be sent for the first time.

In the embodiment of the invention, when the core network element resends the MBMS service data packet which is not received by the access network, the IP destination address of the MBMS service data packet to be sent is set as the IP address of the access network element or is set as the same IP address as the IP address of the MBMS service data packet which is sent for the first time.

In the embodiment of the invention, when the core network element resends the MBMS service data packet which is not received by the access network, the currently sent MBMS service data packet is marked as the resent MBMS service data packet by the following modes:

newly adding a synchronous protocol data packet format;

a data packet for indicating the currently transmitted MBMS service data packet to be retransmitted is defined in the format of the synchronization protocol data packet.

A method of transmitting multicast traffic, the method comprising:

the core network element indicates the information of the target UE of the MBMS service data packet of the access network element through signaling, so that the access network element dispatches and transmits the MBMS service on a wireless interface according to the information of the target UE of the MBMS service data packet.

In the embodiment of the present invention, the target UE is a UE interested in the MBMS service data packet or a UE receiving the MBMS service data packet.

In the embodiment of the present invention, the information of the target UE includes at least one of the following:

the number of target UE of the MBMS data packet in a specific area;

In the embodiment of the invention, the core network element acquires the information of the target UE of the MBMS data packet by the following modes:

receiving identification information of an MBMS service data packet which is sent by the UE and is interested by the UE through a non-access layer signaling;

and receiving the coverage grade information or the position information sent by the UE.

and when the UE performs an attachment process, or performs a tracking area updating process, or when the MBMS of interest changes, and adds or deletes the MBMS of interest of the UE, the UE sends the identification information of the MBMS data packet of interest of the UE to the core network element.

and the core network element generates a list of identifications of the MBMS data packets of which the UE is interested according to the MBMS identification information of which the UE is interested.

In the embodiment of the present invention, the core network element acquires information of a target UE of the MBMS service data packet, including:

and when the core network element receives the MBMS session starting signaling or the MBMS session updating signaling sent by other core network elements, acquiring the identification information of the target UE of the MBMS service data packet in the MBMS session starting signaling or the MBMS session updating signaling.

A method of transmitting multicast traffic, the method comprising:

the access network element signals information of the plurality of transmission resources for one or more transmissions of the one or more data blocks in a single schedule.

In the embodiment of the present invention, the access network element transmits the one or more data blocks in the transmission resource indicated by the scheduling information.

In the embodiment of the present invention, the information of the plurality of transmission resources includes: the number information of the plurality of transmission resources and the interval information of the plurality of transmission resources.

the number information and the interval information of the plurality of transmission resources are respectively indicated through dynamic scheduling signaling PDCCH DCI or semi-static signaling.

In the embodiment of the present invention, the number information and interval information of the plurality of transmission resources are indicated by dynamic scheduling signaling PDCCH DCI or semi-static signaling, respectively, including:

the access network element indicates the quantity information of the plurality of transmission resources through semi-static signaling, and indicates the interval information of the plurality of transmission resources through dynamic scheduling signaling PDCCH DCI.

the access network element indicates the intervals of the plurality of transmission resources through dynamic signaling, and indicates the quantity information of the plurality of transmission resources through semi-static signaling.

In the embodiment of the present invention, the number information and interval information of the plurality of transmission resources are indicated by dynamic scheduling signaling PDCCH DCI or semi-static signaling, respectively, including: the access network element indicates the quantity information and the interval information of the plurality of transmission resources through dynamic signaling.

the access network element indicates the quantity information and the interval information of the plurality of transmission resources through semi-static signaling.

In the embodiment of the present invention, the information of the plurality of transmission resources further includes: a starting position of a first transmission resource in the plurality of transmission resources, wherein the starting position is a combination of a system super frame number H-SFN and a system frame number SFN, or a relative time interval of a transmission starting time or a transmission ending time relative to the dynamic scheduling signaling;

correspondingly, the starting position is indicated through semi-static signaling or dynamic scheduling signaling.

In the embodiment of the present invention, the scheduling of the primary transmission includes:

and the physical channel data carrying the specific service data packet is repeatedly transmitted once or more times on the wireless interface.

In the embodiment of the invention, the transmission resource refers to a wireless subframe resource used for transmitting the data block for one time;

the interval information of the plurality of transmission resources refers to an interval between two adjacent transmission resources in the plurality of transmission resources, including an interval between a first radio subframe of two adjacent transmission resources, an interval between a last radio subframe of two adjacent transmission resources, or an interval between a last radio subframe of a previous transmission resource and a first radio subframe of a subsequent transmission resource.

An apparatus for transmitting multicast traffic, the apparatus comprising:

a scheduling unit, configured to schedule, at a radio interface, transmission of an MBMS service data packet carried by an SC-MTCH of N times of multicast transmission channels; n is an integer greater than or equal to 2.

In an embodiment of the present invention, the apparatus further includes:

and the indication unit is used for indicating repeated scheduling information for scheduling the MBMS data packet to a receiver when the scheduling unit schedules the transmission of the MBMS data packet.

In an embodiment of the present invention, the apparatus further includes:

and the numbering unit is used for numbering the MBMS data packets so that the numbering of the MBMS data packets is circularly used in a numbering range.

In an embodiment of the present invention, the apparatus further includes:

and the notification unit is used for notifying the receiver of the times N of the MBMS data packet scheduling through a system message or a multicast control channel SC-MCCH message.

In the embodiment of the present invention, the scheduling unit is further configured to continuously schedule N times of MBMS service data packets for one MBMS service data packet.

A transmission apparatus of multicast traffic, comprising:

the setting unit is used for appointing or agreeing feedback channel resources of feedback information for downlink scheduling transmission of the MBMS data packet;

the receiving unit is used for triggering the retransmission unit after receiving the feedback information of the downlink scheduling transmission of the MBMS data packet on the feedback channel resource;

and the retransmission unit is used for retransmitting the MBMS data packet.

In the embodiment of the present invention, the retransmission unit is further configured to:

retransmitting the MBMS data packet when the Mth scheduling is performed after the MBMS data packet is scheduled; m is a preset value; or alternatively, the process may be performed,

only scheduling transmission of the MBMS data packet once in each SC-MTCH scheduling period, and retransmitting the MBMS data packet in a P scheduling period after the first scheduling; p is a preset value; or alternatively, the process may be performed,

Scheduling transmission of the MBMS data packet for a plurality of times in each SC-MTCH scheduling period, and retransmitting the data packet in an O scheduling period after the first scheduling; or alternatively, the process may be performed,

and after the receiving unit receives the failure feedback information of the current scheduling, retransmitting the data packet.

In an embodiment of the present invention, the apparatus further includes:

the indication unit is used for indicating that the MBMS data packet is transmitted for the first time or indicating the number of the MBMS data packet and the transmission for the first time through the PDCCH signaling or other signaling of the MBMS data packet when the MBMS data packet is scheduled for the first time.

In an embodiment of the present invention, the indicating unit is further configured to:

when the MBMS data packet is rescheduled, the PDCCH signaling or other signaling of the MBMS data packet is scheduled to indicate that the MBMS data packet is retransmitted, or indicate the number of the MBMS data packet and retransmission.

An apparatus for transmitting multicast traffic, the apparatus comprising:

a receiving unit, configured to receive control information indicating, by a network element of a receiving access network, a feedback service receiving state of a transmission device of the multicast service through a system information block or an SC-MCCH channel;

And the sending unit is used for feeding back the state of the UE receiving service according to the control information of the feedback service receiving state.

In the embodiment of the present invention, the control information of the feedback service receiving state is used to instruct the transmission device of the multicast service to feedback whether to successfully receive the MBMS service data packet.

In an embodiment of the present invention, the control information includes: the identification information of the service requiring feedback of the receiving state, or

The control information includes: the identification information of the service requiring feedback of the receiving state and at least one of the following information: and the transmission device of the multicast service feeds back the used uplink resource information and the feedback probability factor.

RRC message.

A traffic transmission apparatus, the apparatus comprising:

a configuration unit, configured to configure a multiple transmission period MTP for a transmission channel;

and the scheduling unit is used for scheduling one or more specific MBMS service data packets at a time in the MTP.

the length information of the MTP, the offset information of the starting position of the MTP and the frequency information of repeatedly transmitting the specific MBMS data packet at the MTP.

A transmission apparatus of multicast traffic, comprising:

and the indication unit is used for indicating the scheduling information of one or more transmissions of the specific MBMS service data packet through the dynamic scheduling signaling, so that the UE receives the specific MBMS service data packet according to the dynamic scheduling signaling.

the same specific MBMS service data packet is transmitted one or more times in the radio interface.

A transmission apparatus of multicast traffic, comprising:

and the determining unit is used for enabling the UE to send feedback information to the access network element according to the feedback condition through signaling indication or agreement with the UE on the feedback condition of the received service or the service interested in receiving.

A transmission apparatus of multicast traffic, comprising:

an indication unit, configured to indicate, through signaling, a scheduling parameter of a ue mbms service data packet, where the scheduling parameter includes at least one of the following: the repetition factor, coverage class information and the receiving success rate/failure rate threshold used when the MBMS data packet is scheduled.

In the embodiment of the present invention, the indication unit indicates the scheduling parameter through SC-MCCH message, or system information block SIB, or PDCCH DCI for scheduling MBMS service data packet.

A traffic transmission apparatus comprising:

and the receiving unit is used for receiving one or more schedules of the service data packets in one or more MTPs for scheduling the service data packets.

In an embodiment of the present invention, the apparatus further includes:

and the judging unit is used for judging that the scheduled service data packets in different MTPs are different service data packets according to the boundary of the MTPs when the multiple schedules of one service data packet are in the same MTP and one MTP only schedules the same service data packet once or multiple times.

An apparatus for transmitting multicast traffic, the apparatus comprising:

And a transmission unit for signaling information indicating a plurality of transmission resources for one or more transmissions of one or more data blocks in one scheduling.

In the embodiment of the present invention, the transmission unit is further configured to transmit one or more times of the one or more data blocks in a transmission resource indicated by the scheduling information.

The technical scheme of the embodiment of the invention realizes repeated scheduling of the service data packet for a plurality of times on the wireless interface, improves the reliability of sending and receiving the service data borne by the SC-MTCH, provides the UE with the opportunity of repeated receiving, avoids the failure of data receiving caused by short-term interference, and enables the UE successfully receiving a certain data packet to skip (not receive) the subsequent repeated scheduling of the data packet by indicating the repeated scheduling information, thereby saving the power consumption of the UE.

Drawings

Fig. 1 is a schematic diagram of a scheduling manner of an SC-MCCH channel in an LTE system;

fig. 2 is a schematic diagram of a scheduling manner of an SC-MTCH channel in LTE;

fig. 3 is a schematic diagram illustrating multiple scheduling of a data packet according to embodiment 1 of the present invention;

fig. 4 is a schematic diagram of retransmission scheme 1 in embodiment 2 of the present invention;

fig. 5 is a schematic diagram of retransmission scheme 2 according to embodiment 2 of the present invention;

fig. 6 is a schematic diagram of retransmission scheme 3 according to embodiment 2 of the present invention;

FIG. 7 is a schematic diagram of a scheduling method according to embodiment 9 of the present invention;

FIG. 8 is a schematic diagram of another scheduling method according to embodiment 9 of the present invention;

FIG. 9 is a schematic diagram of another scheduling method according to embodiment 11 of the present invention;

fig. 10 is a schematic structural diagram of a transmission device for multicast service according to the first embodiment of the present invention;

fig. 11 is a schematic structural diagram of a transmission device for multicast service according to a second embodiment of the present invention;

fig. 12 is a schematic structural diagram of a transmission device for multicast service according to the third embodiment of the present invention.

Detailed Description

For a more complete understanding of the nature and the technical content of the embodiments of the present invention, reference should be made to the following detailed description of embodiments of the invention, taken in conjunction with the accompanying drawings, which are meant to be illustrative only and not limiting of the embodiments of the invention.

The embodiment of the invention discloses a transmission method of multicast service, which is suitable for an access network side and specifically comprises the following steps:

The transmission method of the multicast service in the embodiment of the invention further comprises the following steps:

numbering the MBMS data packets, wherein the numbering of the MBMS data packets is circularly distributed and used in a numbering range.

The embodiment of the invention discloses a transmission method of multicast service, which is suitable for an access network element side, and the method further comprises the following steps:

The embodiment of the invention discloses a transmission method of multicast service, which is suitable for a UE side and specifically comprises the following steps:

The receiver receives the repeated scheduling information of the MBMS data packet and receives the MBMS data packet sent by the sender according to the repeated scheduling information;

after the receiver successfully receives the MBMS data packet, the receiver does not monitor the scheduling of the MBMS data packet; and when the MBMS data packet is not received, continuing to receive the MBMS data packet based on the repeated scheduling information until the MBMS data packet is successfully received or the scheduling of a new MBMS data packet is detected.

In the embodiment of the present invention, the receiving side successfully receives the MBMS service data packet, including:

the number of the MBMS data packet received by the receiver is the same as the number of the MBMS data packet contained in the repeated scheduling information; or alternatively, the process may be performed,

and the receiver successfully receives the MBMS data packet in the dispatching period of the MBMS data packet.

the receiver receives control information which is sent by the sender and indicates the receiving state of the feedback service;

and the receiver feeds back the successful or failed information of the MBMS data packet received by the receiver according to the control information of the feedback service receiving state.

The control information includes: the identification information of the service requiring feedback of the receiving state and at least one of the following information: the UE feeds back the used uplink resource information and the feedback probability factor.

RRC message.

The following further illustrates the essence of the technical solution of the embodiment of the present invention by means of specific examples.

Example 1

As shown in fig. 3, the access network element schedules, on the radio interface, transmission of MBMS service data packets carried by the multicast transmission channel SC-MTCH N times.

When the access network element schedules a data packet, the access network element indicates repeated scheduling information for scheduling the data packet, and the repeated scheduling information comprises: the number of the scheduling is the scheduling number of the data packet, and/or whether the scheduling is the information of the first scheduling of the data, and/or the scheduling number information of the data which is remained, and/or the number information of the data packet.

The repeated scheduling information is indicated by the PDCCH signaling of the PDSCH channel carrying the SC-MTCH, namely, the DCI scrambled by the G-RNTI.

The numbering information of the data packets refers to numbering each data packet, and the numbers are circularly distributed in the value range.

As an implementation manner, the eNB indicates the number N of scheduling of each service data packet by the UE through a system message or an SC-MCCH message.

As an implementation, for one data packet, the access network element schedules N data packets consecutively, i.e. each data packet is scheduled N times consecutively in turn.

The primary scheduling in the embodiment of the present invention includes multiple repeated transmissions of a PDSCH channel and/or a PDCCH channel, for example, M1 repeated transmissions of a PDCCH and M2 repeated transmissions of a PDSCH, which form the primary scheduling in the present invention, that is, as shown in fig. 2, a primary dynamic scheduling and transmission.

And the UE receives the SC-MTCH data packet sent by the eNB according to the repeated scheduling information of each data packet.

If the UE successfully receives a packet, the subsequent scheduling of the packet may be ignored. Otherwise, the UE receives a repeated schedule of the data packet until the data packet is successfully received, or until a schedule of a new data packet is detected.

The method for judging that the UE successfully receives one data packet comprises one of the following steps:

1. when the repeated scheduling information contains the number of the data packet, if the UE successfully receives the number n of one service data packet, the UE considers that the data packet with the number n of the data packet is successfully received.

2. The repeated scheduling information comprises scheduling sequence number information, and the UE is indicated to the repeated scheduling times N of each data packet, or the repeated scheduling information comprises the remaining scheduling times information, if the UE only needs to successfully receive any one of the N times of scheduling of one data packet, the UE considers that the data packet is successfully received, namely, the UE only needs to successfully receive one of the N times of scheduling in the continuous scheduling sequence numbers of 1 to N, or the remaining scheduling times of N to 1.

The following is a specific example to illustrate the implementation procedure of the technical solution of the embodiment of the present invention:

the access network element continuously schedules the service data N times and then schedules the next SC-MTCH packet.

When the access network element schedules the SC-MTCH data packet, the number of the currently scheduled data packet is indicated in PDCCH signaling DCI scrambled by the service G-RNTI, the number is circularly allocated in the value range, for example, the number is 0 to 7, the number of the data packet is allocated from 0 to 7, and then the number is circularly allocated from 0 to 7. The UE identifies the scheduling of different data packets according to the number of the data packet.

As an implementation manner, the access network element indicates, through the SC-MCCH message or the system information block, the number N of times each SC-MTCH service is repeatedly scheduled when the SC-MTCH service is scheduled.

The access network element continuously transmits the PDCCH signaling for M1 times and the PDSCH channel data for M2 times when the SC-MTCH data packet is scheduled each time. This constitutes a complete schedule and transmission of the data.

And the UE judges whether the data packet is successfully received or not according to the number of the scheduled data packet indicated in the received PDCCH signaling DCI. For example, the UE indicates that the data packet is n in the received DCI, and after the UE has successfully received the data packet with the number n-1, the UE may ignore the PDSCH schedule indicated by the DCI until the UE receives the DCI with the number n+1, at which time the UE receives the PDSCH schedule with the number n+1 according to the indication of the DCI.

The technical scheme of the embodiment of the invention realizes repeated scheduling of the service data packet for a plurality of times on the wireless interface so as to improve the reliability of sending and receiving the service data borne by the SC-MTCH, provide the UE with the opportunity of repeated receiving, avoid the failure of data receiving caused by short-term interference, and enable the UE successfully receiving a certain data packet to skip (not receive) the subsequent repeated scheduling of the data packet by indicating the repeated scheduling information, thereby saving the power consumption of the UE.

Example 2

The access network element designates or agrees with feedback channel resources for ACK and/or NACK for downlink scheduling transmission of the SC-MTCH data packet through a protocol.

And the UE sends ACK or NACK feedback on the feedback channel resource according to the receiving state of the downlink scheduling transmission of the SC-MTCH.

And the network side retransmits the downlink transmission data packet according to the received NACK.

The ACK is feedback of the scheduled data packet, i.e. the ACK is received successfully, and the NACK is feedback of the scheduled data packet not received successfully.

The feedback ACK and NACK refer to feedback of one-time scheduling transmission, namely scheduling transmission of one data packet, and signaling assignment or protocol agrees with feedback channel resources.

The uplink feedback resource is a shared uplink feedback resource of the UE receiving the SC-MTCH channel, that is, a plurality of UEs receiving the SC-MTCH use the feedback channel resource and are used for feeding back the ACK or NACK that they receive the primary scheduling transmission.

As an implementation manner, when the access network element schedules the data packets, the access network element signals DCI or other signaling indication through PDCCH, and the number of each data packet.

As an implementation manner, the access network element indicates whether the data packet scheduled by the access network element is first transmitted or retransmitted through the PDCCH signaling DCI.

The feedback channel resources include one or more of the following:

1. physical random access channel resources including a preamble (preamble) specified in a Physical Random Access Channel (PRACH), and time domain resources to transmit the preamble. As an implementation manner, the UE may repeat transmitting the preamble for a number of times through signaling or protocol.

2. Resources in a Physical Uplink Shared Channel (PUSCH) include time domain and frequency domain resources. As an implementation manner, the uplink resource information further includes repetition number information of the PUSCH signaling.

3. Channel resources in a Physical Uplink Common Channel (PUCCH), and time domain resources for transmitting signals on the PUCCH channel.

The time domain resource information in the feedback channel resource refers to one of the following cases:

1. relative time to the last PDSCH subframe of the transmitted SC-MTCH packet, or time domain resources at N subframe intervals.

2. Relative time to the last PDCCH subframe in which the SC-MTCH packet is transmitted, or time domain resources at N subframe intervals.

3. Relative time relative to the first PDSCH subframe in which the SC-MTCH packet is transmitted, or time domain resources at N subframe intervals.

The access network element retransmitting the downlink transmission data packet according to the received feedback means one or more of the following modes:

mode 1:

and retransmitting the data packet when the access network element schedules the N time of scheduling after the data packet, wherein the access network element indicates the number of the data packet in PDCCH signaling DCI or other signaling and/or indicates whether the scheduling is the first transmission or retransmission when the access network element schedules the first transmission and retransmission of the data packet.

And the N is protocol agreement or indicates the UE through signaling.

As shown in fig. 4, the access network first transmits the first transmission of the data packet a, and designates NACK resources for feedback reception of the data packet a. If the access network receives NACK for the first transmission of the data packet A, the access network resends the data packet A in the Nth scheduling after the first transmission scheduling. When retransmitting the data packet a, the access network indicates this scheduling retransmission in the PDCCH signaling DCI, at which point the UE can know that this transmission is a retransmission of the data packet a. If the UE has successfully received the first transmission of data packet A, the UE may ignore this schedule. Otherwise, the UE receives the retransmission schedule of the data packet a.

Mode 2:

the access network element schedules the transmission of the data packet only once in each SC-MTCH scheduling period, and indicates the first transmission when the data packet is scheduled to be transmitted for the first time, and/or indicates the number of the data packet.

And the access network element resends the data packet in the subsequent N scheduling period. When the access network element schedules retransmission of the data packet, the number of the data packet is indicated in the PDCCH signaling DCI or other signaling, or the scheduling is retransmission. The N is protocol convention or indicates UE through signaling.

As an implementation, if the access network element receives NACK feedback for retransmission of the data packet, the secondary data packet is scheduled again in an nth scheduling period after the scheduling period of the retransmission secondary data packet, and the retransmission of the data packet is indicated, and/or the number of the data packet is indicated.

As shown in fig. 5, the access network schedules transmission of data packets only once per SC-MTCH scheduling period. The access network schedules the first transmission of data packet a in the first SC-MTCH period shown and designates NACK resources for feedback received data packet a. If the access network receives NACK for the first transmission of the data packet A, the access network retransmits the data packet A in the N scheduling period after the SC-MTCH scheduling period.

When retransmitting the data packet a, the access network indicates this scheduling retransmission in the PDCCH signaling DCI, at which point the UE can know that this transmission is a retransmission of the data packet a. If the UE has successfully received the first transmission of data packet A, the UE may ignore this schedule. Otherwise, the UE receives the retransmission schedule of the data packet a.

Mode 3:

the access network element schedules transmission of a plurality of data packets in each SC-MTCH scheduling period, and the access network element numbers the data packets scheduled for the first time in each SC-MTCH scheduling period, indicates the numbers in the scheduled PDCCH signaling DCI or other signaling, and indicates the transmission as the first transmission.

And the access network element resends the data packet in the subsequent N scheduling period of the scheduling data packet, and indicates that the scheduling is retransmission in PDCCH signaling DCI for scheduling the retransmission data packet or other signaling.

The N is protocol convention or indicates UE through signaling.

As shown in fig. 6, the access network schedules transmission of data packets multiple times per SC-MTCH scheduling period. The access network schedules the first transmission of packet a in the first SC-MTCH period shown, designates NACK resources for feedback reception of packet a, and numbers 1 for this packet. If the access network receives NACK for the first transmission of the data packet A, the access network retransmits the data packet A in the N scheduling period after the SC-MTCH scheduling period.

When retransmitting the data packet a, the access network indicates this scheduling to retransmit in the PDCCH signaling DCI and indicates the number 1 of the data packet, at which point the UE can know that this transmission is a retransmission of the data packet a. If the UE has successfully received the first transmission of data packet A, the UE may ignore this schedule. Otherwise, the UE receives the retransmission schedule of the data packet a.

Mode 4:

when scheduling an SC-MTCH data packet, an access network indicates that the scheduling is first transmission in PDCCH signaling DCI, scheduling information or other signaling of the data packet, and indicates the number of the data packet.

And when receiving NACK feedback for the scheduling, the access network reschedules the data packet later, and indicates the scheduling to be retransmission in the rescheduled PDCCH signaling DCI, or in scheduling information or other signaling, and indicates the number of the data packet.

If the access network is receiving NACK feedback for rescheduling, the same process as sending the data packet is rescheduled as above.

If the UE successfully receives a data packet with number n, then the later scheduled data packet with number n and marked as retransmitted may be ignored.

The embodiment provides a feedback retransmission mechanism in point-to-multipoint downlink transmission, a mechanism for feeding back NACK and ACK by a plurality of UE and a mechanism for retransmitting data by an access network. By implementing the method, the purposes of saving cell bandwidth resources and improving the reliability of downlink multicast transmission can be achieved.

Example 3

In this embodiment, a method for a UE to feed back a state of its received service to a network is provided.

The access network element indicates the control information of the receiving state of the feedback service through the system information block or the SC-MCCH channel, and the UE feeds back the state of the receiving service according to the control information of the receiving state of the feedback service.

And the control information for feeding back the service receiving state is used for indicating whether the UE feeds back a certain service to be successfully received or not, including successfully receiving the service and/or unsuccessfully receiving the service.

As an implementation manner, the control information for feeding back the service receiving state includes identification information of the service requiring feedback of the receiving state.

As an implementation manner, the control information of the feedback service receiving state further includes uplink resource information used by the UE for feedback.

As an implementation, a feedback probability factor is also included.

The uplink resource for feeding back the receiving state and the corresponding UE feedback method comprise the following steps:

method 1:

the uplink resource information includes a preamble (preamble) in a Physical Random Access Channel (PRACH) and time domain information for transmitting the preamble.

As an implementation manner, the uplink resource further includes information of the number of times that the UE repeatedly sends the preamble.

And the UE sends feedback according to the uplink resource information.

UE feedback mode 2:

the uplink resource information includes channel resources in a designated Physical Uplink Common Channel (PUCCH), and time domain information of a signal transmitted on the PUCCH channel.

And the UE sends a feedback signal on the appointed PUCCH channel according to the information.

UE feedback mode 3:

the uplink resource information includes resources in a designated Physical Uplink Shared Channel (PUSCH). Including time domain, frequency domain resource information.

As an implementation manner, the uplink resource information further includes repetition number information of the PUSCH signaling.

And the UE sends feedback according to the uplink resource information.

UE feedback mode 4:

the UE initiates an RRC connection and indicates the fed back service identity and/or reception status through an RRC message.

If the fed-back time domain information is indicated, the UE initiates feedback in the time domain. If the time domain information indicating the feedback is not available, the UE initiates RRC connection when detecting that the service receiving fails, or initiates RRC connection when detecting that the service session (session) stops, or initiates RRC connection after receiving the control information of the feedback receiving service state.

When the feedback receiving service state control information also indicates a feedback probability factor, the UE decides whether to initiate feedback according to the probability factor. Specifically, the UE selects a random number and decides whether to initiate feedback according to the relation between the random number and the probability factor, for example, when the random number is greater than the probability factor.

In the above UE feedback modes 1, 2, 3 and 4, the time domain information includes one or more of the following:

1. an absolute time

2. And the time indicated in the control information of the feedback service receiving state.

3. The relative time of the transmission time of the signaling of the control information with respect to the feedback traffic reception state, for example, T time units after or when the control information of the feedback traffic reception state is received.

4. And the relative time of the stop time of the service needing to feed back the receiving state.

The time domain information may be indicated by signaling, or agreed by a protocol.

The access network element receives the feedback information of the service receiving state and performs the following processing:

1. and initiating a scheduled transmission of the service on a wireless interface.

2. And sending the feedback information or the summary of the feedback information to a core network element.

As an implementation manner, when the core network element initiates a session of an MBMS service, the core network element indicates, through a MBMS session start message, the start of the session of the access network element, and in this process, the core network further indicates that the access network element needs the UE to feed back a receiving state of the service, where the receiving state includes successful reception and/or unsuccessful reception.

By the technical scheme of the embodiment, the feedback that the access network element and the core network element acquire the receiving state of the UE is realized when the point-to-multipoint downlink transmission is realized. The network can judge whether to reinitiate service transmission according to the feedback information.

Example 4

The access network element sends a feedback control message to instruct the core network element that the access network element does not receive information of one or more MBMS service data packets in one or more synchronization sequences. At this time, the feedback control message carries the identification information of the synchronization sequence, namely the timestamp information of the synchronization sequence, and the identification information of the lost MBMS service data packet in the synchronization sequence.

The feedback control message is implemented in the form of a control plane message from the access network to the core network element or a synchronization protocol control packet (SYNC PDU without payload) is defined.

The identification information of the MBMS data packet is one or more of the following:

1. the access network does not receive the list and the number of the MBMS service data packet identifiers, wherein the identifiers are the sequence numbers of the MBMS service data packets in the synchronous sequence, namely packet number information in the SYNC PDU 1 or 2. If all the MBMS service data packets in the synchronization sequence are carried, only the number information of the MBMS service data packets which are not received or the information related to the MBMS service data packets of the synchronization sequence is not indicated except the identification information of the synchronization sequence. 2. The identification of the initial MBMS data packet and the number of MBMS data packets which are not received continuously by taking the identification as the starting point. For example, MBMS service packet number A1, MBMS service packet number N, indicates N consecutive MBMS service packets with A1 as the starting sequence number.

And the core network element receives the feedback control message and resends the MBMS data packet which is not received by the access network.

When the core network element resends the MBMS service data packet which is not received by the access network element, the time stamp information and the packet number information of the MBMS service data packet are respectively set as the time stamp and the packet number information when the data packet is sent for the first time. I.e. the core network element retransmits the MBMS service data packet as if it were first transmitted.

Optionally, when retransmitting the MBMS service data packet that is not received by the access network element, the core network sets the IP protocol destination address of the core network as the IP address of the access network element, or sets the IP address that is the same as the IP address of the first MBMS service data packet.

Optionally, when the core network element retransmits the MBMS service data packet not received by the access network element, the core network element further marks the retransmitted MBMS service data packet as a retransmitted MBMS service data packet, and the method includes one of the following:

1. a new synchronization protocol packet format is defined, i.e. the type of SYNC PDU dedicated for the core network element to retransmit the MBMS service packet is newly defined.

2. In the format of a sync protocol packet, one bit of information is defined to indicate that the frame packet is a retransmitted packet. Preferably, in the existing SYNC PDU types 1 and 2, one of its idle bits (spark bit) is set to the "resend" indication described above.

The network element of the access network receives the retransmitted MBMS service data packet, and can avoid mistaking the retransmitted MBMS service data packet as a new synchronous sequence according to the retransmission indication or the SYNC PUD type special for retransmitting the MBMS service data packet.

The core network element (BMSC, or MGW) sends MBMS service data packet to the access network element in a synchronous sequence (synchronization sequence) mode. The synchronization sequence refers to a group of MBMS service data packets marked with the same time stamp information, and different time stamp information identifies different synchronization sequences. In a synchronization sequence, MBMS service packets are marked with a packet identity (packet number), which indicates the number of packets that have been transmitted in this synchronization sequence. The MBMS service packet is a SYNC PUD (SYNC PDU type 1 or SYNC PDU type 2) of type 1 or type 2 in the existing synchronization protocol (SYNC protocol).

In addition, in the SYNC protocol, SYNC PDU type 0 and SYNC PDU type 3 are also defined, and these two SYNC PDUs are sent to the access network after each synchronization sequence, and the timestamp information carried by the SYNC PDU type 0 and SYNC PDU type 3 is the same as the synchronization sequence sent before the SYNC PDU type 0 and the packet number carried by the SYNC PDU type 3 is the number of MBMS service data packets in the synchronization sequence sent before the SYNC PDU type, and the total number of packet information carried by the packet number indicates the total number of MBMS service data packets sent in one synchronization period (synchronization period).

When receiving data of an MBMS service sent by a core network element, an access network element can identify different synchronization sequences through timestamp information in the above SYNC protocol, detect whether there is a loss of a data packet by detecting continuity of a data packet identifier carried by an MBMS service data packet in the same synchronization sequence, detect the number of the lost MBMS service data packet and its identifier in the synchronization sequence, and detect total number of packet in SYNC PDU types 0 and 3, whether there is a loss of a data packet at the tail of the synchronization sequence before sending SYNC PDU types 0 and 3, that is, whether there is a loss of the last one or more MBMS service data packets in the synchronization sequence, and whether the entire synchronization sequence is lost.

By the method of the embodiment, the access network element feeds back the MBMS service data packet which is not received by the access network element through the feedback method provided by the embodiment, and the core network element can retransmit the MBMS service data packet which is not received by the access network element, thereby avoiding the situation that the data of the access network element is incomplete when the access network element transmits the MBMS service because of the loss of the data packet in the transmission process from the core network element to the access network element. Because MBMS is a broadcast multicast service for a plurality of UEs, loss of a data packet at the ground side may cause that all UEs receiving the MBMS service under an access network element cannot completely receive the service, and the integrity of the reception is critical for updating the type of service in software downloading.

Example 5

In this embodiment, the core network element indicates, by signaling, information of a target UE of an MBMS service of the access network element, and the access network element schedules and sends the MBMS service on a radio interface according to the information of the target UE of the MBMS service.

The target UE refers to a UE interested in the MBMS service or a UE receiving the MBMS service, and there are multiple target UEs of one MBMS service.

The target UE information of the MBMS in the indication access network element of the core network element refers to one or more of the following conditions:

1. the MBMS service is a maximum value of coverage levels (CEL) of all target UEs within a specific area.

2. And the average value of CEL of all target UE in a specific area of the MBMS service.

3. The number of target UEs corresponding to one or more CELs in a specific area, i.e. a list of CELs and corresponding numbers of UEs, e.g. (CEL 1, number of UEs 1), (CEL 2, number of UEs 2)

4. The proportion of the UE corresponding to one or more CEL in a specific area, i.e. a list of CEL to corresponding target UE proportion, e.g. (CEL 1, UE proportion 1), (CEL 2, UE proportion 2). . .

5. The number of target UEs of the MBMS service in a specific area.

6. And the core network element indicates the identification of the specific area and/or the number information of the target UE in the specific area of the access network element if the number of the target UE in the specific area is greater than the threshold N. The threshold N is indicated by signaling between the access network element and the core network element one, or the parameter N is configured for the core network element one by an Operation Administration (OAM) server.

The specific Area is of a Cell (Tracking Area), or an MBMS Service Area (Service Area).

The access network element schedules and transmits the MBMS service on a radio interface according to the information of the target UE of the MBMS service, which means that when the access network element schedules and transmits the MBMS service a in the cell in the specific area, the access network element selects a scheduling parameter used for transmitting the MBMS service data according to the information of the target UE indicated by the core network element, where the scheduling parameter includes but is not limited to one or more of the following: repetition factor or repetition number (repetition factor), modulation and Coding Scheme (MCS), transport Block Size (TBS), etc., and the number of times each MBMS service data Transport Block (TB) repeatedly schedules transmissions on the radio interface.

The core network element firstly obtains the information of the target UE of the MBMS by the following method:

mode 1:

the UE indicates the first core network element with the identification information (TMGI) of the MBMS service of interest through non-access layer signaling, where the non-access layer signaling includes, but is not limited to: registration request messages (register requests), attach requests (Attach requests), and tracking area update request messages (Track area update request).

Optionally, the UE also reports its coverage class information (CEL) to the core network element one.

Optionally, the UE further indicates its location information to the first core network element, where the location information includes an identifier of a Cell (Cell) where the UE is located, and/or a Tracking Area identifier, and/or an MBMS service Area (MBMS service Area) identifier.

The UE sends the identification information of the MBMS service of interest to the core network element one in one or more of the following cases: when the UE performs an Attach procedure (Attach), the UE performs a tracking area update procedure (Track Area Update), and when the MBMS service of interest of the UE changes, that is, when the UE adds or deletes the MBMS service of interest.

And the UE reports the interested MBMS service identifier to the core network element once, wherein the form of the UE is a list of the interested MBMS service identifier TMGI.

The core network element stores the information reported by the UE, including CEL information reported by the UE, and/or information of interested MBMS service reported by the UE, and/or position information reported by the UE.

When the core network element receives session start signaling or (MBMS Session Start Request) or session update signaling (MBMS Session Update request) of the MBMS service a, it can know which UEs are interested in the MBMS service a through the identifier a of the MBMS service and the stored identifier information of the MBMS service interested in the UE, so as to know the information of the target UEs of the MBMS service a, including the number information of the target UEs, the position information of the target UEs, and/or the CEL information of the target UEs, and obtain the position distribution of the target UEs, the number and proportion of the target UEs of different CELs in a specific area, the number of UEs in a specific area, the maximum CELs and average CELs in a specific area, and other information according to the information.

Mode 2:

the second core network element indicates the identification information of the target UE of the MBMS service in the MBMS session start signaling (MBMS Session start request) or the MBMS session update signaling (MBMS Session Update Request) sent to the first core network element.

Optionally, the target UE indicates the first core network element, its coverage class information (Coverage Extension Level, CEL) through non-access stratum signaling (NAS signaling).

Optionally, the UE further indicates its location information to the core network element one through non-access stratum signaling (NAS signaling), where the location information includes a Cell (Cell), and/or a Tracking Area (Tracking Area), and/or an MBMS service Area (MBMS service Area).

The non-access network layer signaling (NAS signaling) includes, but is not limited to: registration request messages (register requests), attach requests (Attach requests), and tracking area update request messages (Track area update request).

The identification information of the target UE refers to one or more of the following information: operator identity (operator ID), group identity (group ID), home identity (runner ID), device manufacturer identity (Vendor ID), product type identity (product type) of the UE.

The core network element firstly acquires the identification information of the UE by one of the following modes:

1. the UE indicates the core network element one through the above-mentioned non-access network layer signaling (NAS signaling), in which case the UE stores the identity in a built-in manner.

2. The core network element is obtained from a home registration server of the UE, in which case the UE's identification information is preconfigured.

The first core network element can know which UEs registered in the first core network element are target UEs of the MBMS service and CEL information and/or position information of the target UEs by comparing the identification information of the target UEs of the MBMS service indicated by the second core network element with the identification information of the UEs stored in the first core network element.

In the method provided in this embodiment, if the information of the target UE of the MBMS service changes during the MBMS service (ringing) process, the core network element indicates, by the process MBMS Session Update, the information of the target UE of the MBMS service updated by the access network element.

In this embodiment, the first core network element is a mobility management entity, its functions include mobility management, registration, authentication, and other control plane processes of the UE in the core network, the core network element includes, but is not limited to, a Mobility Management Entity (MME) defined by a 3GPP protocol, the second core network element is a control server of the MBMS service, its functions include initiating a process of starting, stopping, and updating a session of the MBMS service, and the second core network element includes, but is not limited to, a Broadcast Multicast Service Center (BMSC) defined by the 3GPP protocol.

By the method of the embodiment, the access network element can acquire the target UE information of the MBMS service scheduled and transmitted in the cell, so that proper scheduling parameters can be selected according to the target UE information, and the situation that the target UE has too high receiving failure rate or wastes air interface resources due to unreasonable parameter selection caused by missing of the UE information is avoided.

Example 6

In this embodiment, the access network element indicates, by signaling, a scheduling parameter of an MBMS service of the UE, where the MBMS service scheduling parameter includes, but is not limited to: a repetition factor Repetition factor used in scheduling the MBMS service, and/or coverage class information CEL-1, and/or a reception success rate/failure rate threshold.

The repetition factor is used for indicating the repeated transmission times of the wireless interface when a Transmission Block (TB) carrying MBMS service data is transmitted, and/or the repeated transmission times of the physical control channel signaling DCI when the transmission block is scheduled.

The coverage level CEL-1 indicated by the access network refers to a coverage level where the repetition factor can ensure a certain reception success rate, or refers to a threshold where the UE reports the coverage level.

The success rate/failure rate threshold of the received data packet indicated by the access network refers to the success rate or failure rate of the received MAC PDU, or the success rate or failure rate of the received RLC PDU, or the success rate or failure rate of the received PDCP PDU, when a UE receives the MBMS service data.

When the access network does not indicate the coverage level CEL-1, the UE can know the coverage level information CEL-1 from the repetition factor and the mapping relation between the repetition factor indicated by protocol convention or signaling and the coverage level. That is, the coverage level information CEL-1 may be explicitly indicated to the UE by signaling, or may be implicitly indicated to the UE by indicating the repetition factor.

The access network indicates the above-mentioned MBMS service scheduling parameters through SC-MCCH information, or system information block SIB, or PDCCH DCI for scheduling the MBMS service data.

And the UE receiving the MBMS or interested in the MBMS compares the coverage grade information CEL-1 indicated by the access network element with the coverage grade information CEL-2 obtained by measuring the UE, and if the coverage grade CEL-2 is more than or equal to the coverage grade CEL-1, the UE feeds back through a feedback mechanism.

And if the receiving success rate or the failure rate of the UE receiving the MBMS reaches or exceeds the receiving success rate/failure rate threshold indicated by the access network, the UE feeds back through a feedback mechanism. The receiving success rate of the UE reaches or exceeds a receiving success rate threshold, which means that the actual receiving success rate of the UE is smaller than or equal to the receiving success rate threshold indicated by the network element of the access network, and the receiving failure rate of the UE reaches or exceeds the receiving failure rate threshold, which means that the actual receiving failure rate of the UE is larger than or equal to the receiving failure rate indicated by the network element of the access network.

The feedback of the UE through the feedback mechanism means that:

the UE feeds back through a radio resource control protocol message (RRC message), where the feedback content includes, but is not limited to, one or more of the following: the feedback MBMS service identification information, the CEL-2 and the actual receiving success rate/failure rate of the UE;

or the UE feeds back through a Preamble code of a random access channel (PRACH) appointed by the access network for the MBMS service and/or appointed feedback time domain resources, and feeds back through sending the appointed Preamble code at the appointed PRACH.

And the access network updates the scheduling parameters of the MBMS according to the feedback of the UE, indicates the updated scheduling parameters in the signaling sent to the UE, and schedules and sends the data of the MBMS according to the updated scheduling parameters.

The method for the access network to update the scheduling parameters of the MBMS service at the wireless interface and schedule and send the data of the MBMS service according to the updated scheduling parameters comprises the following steps:

when the access network indicates the scheduling parameters through the SC-MCCH information, the access network updates the scheduling parameters of the MBMS in an SC-MCCH modification period, and starts to schedule and send the MBMS data according to the updated scheduling parameters in the SC-MCCH modification period for updating the MBMS scheduling parameters or the next SC-MCCH modification period.

When the access network indicates the scheduling parameters through the system information SIB, the access network updates the scheduling parameters of the MBMS service in a system message modification period, and starts scheduling and sending the MBMS service data according to the updated scheduling parameters in the system message modification period for updating the MBMS scheduling parameters or the next system message update period.

When the access network indicates the scheduling parameters through the PDCCH signaling DCI for scheduling the MBMS service data, the access network can indicate the updated scheduling parameters when any MBMS service data is scheduled and schedule the MBMS service data by using the updated scheduling parameters.

By the method of the embodiment, when the UE finds that the coverage level of the UE is larger than the coverage level or the repetition factor used by the network element of the access network for transmitting the MBMS, the receiving success rate of the UE cannot necessarily be met, in this case, the UE feeds back the coverage level of the UE, and an opportunity of updating the repetition factor used by the network element of the access network is provided, so that the UE can be better met.

Example 7

The access network element agrees with the feedback condition of the UE on the received service or the service interested in receiving through signaling indication or a protocol with the UE, and the UE sends feedback information to the access network element according to the feedback condition.

And the access network element processes according to the feedback information sent by the one or more UE.

The feedback conditions include one or more of the following: and feeding back threshold condition information and feedback limiting condition information.

The feedback threshold condition information includes one or more of the following thresholds:

1. and receiving failure rate threshold condition information, wherein if the receiving failure rate of the UE in receiving the service data is larger than or equal to the receiving failure rate threshold, the UE meets the receiving failure rate threshold condition. The reception failure rate includes one of a MAC PDU, an RLC PDU, or a PDCP PDU reception failure rate.

2. And the UE coverage grade threshold condition information, wherein if the coverage grade of the UE measured by the UE is greater than or equal to the UE coverage grade threshold, the UE meets the UE coverage grade threshold condition.

3. And the receiving failure quantity threshold condition information, if the number of the service data packets which are failed to be received by the UE or the number of the service data packets which are not successfully received by the UE is accumulated to be larger than the receiving failure quantity threshold, the UE meets the feedback receiving failure quantity threshold condition. The service data packet is in the form of one of a MAC PDU, an RLC PDU, or a PDCP PDU. By default, the threshold value of the number of failed reception is set to 1.

4. Threshold condition information of the service data is completely received. If the UE does not successfully receive all the data packets of the service, the UE meets the threshold condition of completely receiving the service data.

The feedback constraint information includes one or more of the following:

1. and feeding back time period limiting condition information. I.e. the start time at which the UE starts feedback and/or the length of time the UE is allowed to feedback. If the UE initiates feedback in the feedback time period, the UE meets the feedback time period limiting condition.

2. The feedback probability limits the condition information. The feedback probability information is used for the UE to calculate the probability of feedback. If the UE calculates that the self feedback probability is more than or equal to the feedback probability, the UE meets the feedback probability limiting condition.

3. And feeding back time interval limiting condition information. The feedback time interval limiting condition information is used for indicating the minimum time interval of the adjacent feedback of the UE. If the time interval of the adjacent two feedbacks of the same service by the UE is larger than or equal to the feedback time interval, namely, the time interval of the last feedback of the time interval of the next feedback of the UE is larger than or equal to the feedback time interval limit, the UE meets the feedback time interval limit condition.

4. And (5) limiting conditions of the feedback times. The feedback frequency limiting condition information is used for indicating the frequency of the UE feeding back the same service session. If the total number of feedback times of the UE to the same service session is smaller than the feedback times limit, the UE meets the feedback times limit condition.

The UE performing feedback should satisfy the following conditions:

1. if the access network element sets or agrees with any one of the feedback threshold conditions, the UE needs to meet at least one of the feedback threshold conditions. If the access network element sets the feedback threshold condition A, B, the UE at least meets the feedback threshold condition a or B.

2. If the access network element sets or agrees with any one of the feedback constraints described above, the UE needs to meet at least one or all of the feedback constraints. If the access network element sets the feedback limit threshold A and B, the UE needs to meet the limit conditions A and B at the same time, or the UE needs to meet the limit conditions A or B.

The feedback information includes one or more of the following:

1. coverage class information (CEL) of the UE.

2. The identification information of the data packet which is not successfully received by the UE comprises the following identification information of the service data packet: sequence numbers of RLC PDUs (RLC SN), PDCP sequence numbers (PDCP SN), or sequence numbers of service data packets.

The identification information is a list of identifications of the data packets which are not successfully received, or a bitmap (bitmap) of the data packets which are not successfully received, or a bitmap of the RLC PDU corresponding to the RLC PDU which is not successfully received, namely the identification information of the service data packet which is not received and indicated by using (PDCP SN, RLC PDU bitmap), or a bitmap of the RLC PDU corresponding to the sequence number of the service data packet which is not successfully received, namely the identification information of the service data packet which is not received and indicated by using (sequence number of the service data packet, RLC PDU bitmap).

3. The UE does not successfully receive the indication of the data packets of all the service sessions, the information is implicit or explicit indication, the implicit indication is that the feedback message type sent by the UE implies that the UE does not successfully receive the data packets of all the services, and the explicit indication is that the UE does not successfully receive the data packets of all the services through a cell in one feedback message.

4. The UE receives the number information of failed data packets, wherein the types of the data packets are MAC PDU, RLC PDU or PDCP PDU.

5. And receiving failure rate information of the UE.

The feedback information further includes identification information of the service to which the feedback is directed, and if the service type is an MBMS service, the identification information of the service includes a TMGI, or an index of the MBMS service in an MBMS service list in an SC-MCCH message or an MCCH message.

6. The UE is interested in the received service identification information.

The feedback reporting method comprises the following steps of feeding back through one or more methods or feedback resources:

1. RRC Connection Request message in the RRC message, optionally, defines the cause (cause) of the RRC connection request dedicated to the feedback of this embodiment. The feedback information is carried in the RRC Connection Request message.

2. The RRC message dedicated for the feedback is the RRC message dedicated for carrying the feedback information, and the dedicated RRC message carries the feedback information.

3. MAC CE dedicated to the feedback. In the method, the UE initiates a random access process through the PRACH channel, and after receiving message 2 responded by the access network, the message 3 message sent by the UE is a MAC CE special for bearing the feedback information.

The MAC CE carries the feedback information.

4. Physical channel resources dedicated to feedback. In the method, the access network element allocates physical channel resources dedicated for transmitting feedback information of the MBMS service, including physical random access channel resources, that is, preamble code resources dedicated for the PRACH channel.

The processing by the access network element according to the feedback information sent by the one or more UEs means that:

1. the access network element decides or updates the scheduling parameters of the service. The scheduling parameters include part or all of the following parameters: a repetition factor (Repetition Factor) for scheduling the traffic, a transport block size TBS, a modulation coding scheme MCS, a number of repetitions, etc.

2. The access network element retransmits part or all of the data packets of the service.

The access network element retransmits the data packet of the service at the following time:

access network retransmission opportunity one: the access network starts scheduling transmission at a specific time after receiving UE feedback information carrying identification information of the service data packet which is not received, wherein the specific time is indicated by the access network through signaling. The UE receives or attempts to accept the retransmission data of the service from the specific time.

And the retransmission time of the access network is two: the access network element transmits all the data of the service, or the access network element transmits all the data which needs to be retransmitted in the last transmission. For example, in the first transmission, the service data to be retransmitted is the data packet A, B, and the access network element retransmits the data packets a and B after all the service data packets are transmitted for the first time. And when retransmitting A and B, the UE feeds back that the data packet A is not received, and the access network element continues to schedule and transmit the data packet A after retransmitting A and B.

3. The access network element indicates the statistical information of the service of the core network element through the control plane message, wherein the statistical information of the service is the information that the access network element synthesizes the feedback information of one or more UE. The service statistical information comprises: the number or proportion of UEs that did not successfully receive.

According to the method, the access network element provides a method for feeding back the service of the UE, in the method, the access network optimizes the feedback content and the time of the UE through the feedback threshold condition and the feedback limiting condition, so that the possibility of feeding back a large amount of data when the large-scale UE simultaneously receives the data of one service is avoided, and the feedback efficiency of the UE is improved. Meanwhile, through feedback and processing performed by a subsequent access network, the access network is provided for adjusting service scheduling parameters according to feedback content to improve the efficiency of scheduling and transmitting service data, or retransmitting part or all of the service data at a wireless interface to improve the success rate of service reception, or counting the result of receiving the service data by the UE so as to facilitate the core network to decide whether to retransmit the whole service subsequently.

Example 8

And when the access network element schedules the data packets of the service, the access network element schedules the data packets of the service for M times or schedules the data packets of the service for M times at most in the scheduling period of the SC-MTCH channel of each service. The M indicates the UE through signaling or through protocol convention.

Optionally, when the access network element schedules a data packet, the access network element indicates repeated scheduling information for scheduling the data packet, where the repeated scheduling information includes: the number of the scheduling is the scheduling number of the data packet, and/or whether the scheduling is the information of the first scheduling of the data, and/or the scheduling number information of the data which is remained, and/or the number information of the data packet.

The primary scheduling described in the present method includes multiple repeated transmissions of PDSCH channels and/or PDCCH channels, for example, M1 repeated transmissions of PDCCH and M2 repeated transmissions of PDSCH, which form the primary scheduling described in the present method, that is, as shown in fig. 2, a dynamic scheduling and transmission.

If the UE successfully receives a packet, the subsequent repeated scheduling of the packet may be ignored. Otherwise, the UE receives a repeated schedule of the data packet until the data packet is successfully received, or until a schedule of a new data packet is detected.

Example 9

As shown in fig. 9, the access network element configures a plurality of transmission periods (multiple transmission period, MTP) for the transmission channel and schedules one or more specific data blocks at a time in the MTP. And the receiving end UE receives the configuration information of the multiple transmission periods and receives the specific data block.

The multiple transmission period MTP configured by the access network element for the transmission channel at least includes: length information of the MTP. Optionally, the method further includes offset information of the starting position of the MTP and frequency information of repeatedly scheduling a specific data block at the MTP.

The starting position of the MTP is calculated by the following formula: (H-SFN x 1024+sfn) mod l=offset; wherein: the H-SFN is the system super frame number, the SFN is the system frame number, mod is the modulo operation, L is the length of MTP, and offset is the offset of the starting position of MTP. The starting position of the MTP is H-SFN and SFN which meet the above formula.

And when the access network schedules the specific data block in the MTP, scheduling and scheduling a plurality of times of scheduling of only one specific data block in one MTP. I.e. different data blocks of the same transport channel are not scheduled in the same MTP.

A particular data block is scheduled in only one MTP, i.e. multiple schedules of the particular data block are each scheduled in one MTP. Or, when a specific data block is scheduled on multiple continuous or discontinuous MTPs, the access network element indicates the information of the multiple continuous or discontinuous MTPs of the receiving end UE, where the information includes at least one of the following: the number information of the plurality of continuous or discontinuous MTPs, the position information of the plurality of continuous or discontinuous MTPs, and the interval size information of the plurality of discontinuous MTPs.

Optionally, the number of times N scheduled in each MTP indicates the receiving UE through signaling or through protocol conventions.

The specific data block scheduling of the access network element refers to: the access network element schedules the specific data block in a dynamic scheduling mode, wherein the dynamic scheduling signaling at least comprises PDCCH signaling DCI, and the PDCCH signaling DCI indicates scheduling information of a PDSCH channel carrying the specific data block.

And the access network element scheduling the specific data block in the MTP refers to that the access network element transmits PDCCH signaling DCI for scheduling the specific data block in the MTP.

Optionally, in one scheduling of the specific data block, the access network element repeatedly sends the PDCCH signaling DCI once or more times on the radio interface. That is, the one scheduling includes one or more repeated transmissions of PDCCH signaling, the PDCCH signaling DCI indicating scheduling information of a PDSCH, and the one scheduling transmission of the PDSCH includes one or more repeated transmissions.

The content of the particular data block remains consistent over multiple schedules of the particular data block.

Optionally, the transmission channel is configured with a scheduling period, and the length of the MTP is an integer multiple of the scheduling period of the transmission channel, and boundaries of the MTP are aligned, that is, one MTP includes an integer number of complete transmission channel scheduling periods.

The receiving end UE receiving the specific data block means: the receiving end UE receives one or more schedules of the specific data block in one or more MTPs for scheduling the specific data block.

And the receiving end UE combines the received signals of the multiple times of scheduling of the specific data.

When multiple schedules of one specific data block are all scheduled in the same MTP and one MTP only schedules the same specific data block, the UE judges that the scheduled specific data block in different MTPs is different specific data block according to the boundary of the MTP.

When the access network element further indicates the number of times of scheduling the specific data block in one MTP, the number of times of receiving the specific data block by the receiving end UE in one MTP does not exceed the number of times, that is, when the UE successfully receives the scheduling of the specific data of the number of times, the UE does not attempt to receive the data block of the transmission channel in the MTP any more.

Optionally, when the transmission channel adopts dynamic scheduling, the receiving UE receives a PDCCH in the MTP to detect PDCCH signaling DCI for scheduling the transmission channel. And receiving the indicated PDSCH channel carrying the service data according to the received PDCCH signaling DCI scheduling the transmission channel.

Optionally, when the transmission channel is configured with a scheduling period, the UE designates a position in the scheduling period of the transmission channel in the MTP to receive a PDCCH channel to detect the PDCCH signaling DCI for scheduling the transmission channel.

The data block is a transport data block (transmission block, TB), or a payload data unit (payload data unit, PDU) of a radio link control protocol (RLC), or a Payload Data Unit (PDU) of a medium access control protocol (MAC).

The transmission channel at least comprises: SC-MTCH channel, DTCH channel, DCCH channel, CTCH channel, MTCH channel, MCCH channel.

The access network element at least comprises an enhanced base station eNB defined by a 3GPP protocol.

As a specific embodiment, specific implementation and beneficial effects are described, in SC-PTM, the SC-MTCH channel is scheduled by using a dynamic scheduling mechanism, in order to improve the reliability of UE reception, that is, the reception success rate, multiple scheduling needs to be performed on each transport block TB at the radio interface, some UEs only need to receive a signaling of partial scheduling to decode the TB block, and for these UEs, it is determined which scheduling is used for the same TB block to help to save battery consumption, and after receiving a TB block successfully, the UE can ignore the subsequent scheduling of the TB.

By the method provided in this embodiment, when the access network element eNB schedules the transport blocks TB of the SC-MTCH, the following preferred manner may be adopted, and in the first preferred method in fig. 1, the UE schedules multiple times of one TB block only in one MTP, and after receiving a successful TB block in one MTP, the UE may ignore the scheduling of the TB block in the MTP. In the second preferred method of fig. 2 below, the eNB configures and indicates one time scheduling of scheduling only one TB in one MTP, and indicates the number of MTPs that continuously schedule one TB block. The UE can know which MTP scheduled TB blocks are the same TB by counting the number of MTPs.

It should be noted that, the PDSCH of the transmission channel scheduled by the PDCCH signaling DCI transmitted in the MTP is not necessarily transmitted in the range of the MTP. I.e. the PDSCH may not be within the MTP, but this does not affect the implementation of the method and the effect of the implementation.

Example 10

The access network element indicates the scheduling information of one or more transmissions of a specific data block through dynamic scheduling signaling.

And the receiving end UE receives one or more transmissions of the specific data according to the dynamic scheduling signaling.

One or more transmissions of a particular data block refers to one or more transmissions of the same particular data block over the wireless interface.

Optionally, one transmission includes repeated transmission (Repetition) of physical channel data carrying the particular data block over the radio interface several times.

The scheduling information indicated in the dynamic scheduling signaling comprises one of the following contents:

1. the starting position information of the one or more transmissions is a combination of an H-SFN and an SFN number, or a relative time interval of starting or ending time of the dynamic scheduling signaling, or a time interval of a starting position of the latter transmission relative to a starting position of the former transmission.

2. The number of the transmission and the time interval between each transmission are the starting position or the ending position of the two transmission

Optionally, the scheduling information indicated by the dynamic scheduling signaling further includes frequency domain resource information used by each transmission, including one or more of the following combinations of information: the frequency of the carrier used for the transmission, an indication of whether to perform frequency hopping transmission, and information of a Physical Resource Block (PRB) used for the transmission.

Optionally, the scheduling information indicated by the dynamic scheduling signaling further includes information of the number of times that physical channel data carrying the specific data block is repeatedly sent at the wireless interface in the one or more transmissions.

The start position or the end position is the position of the first or last radio frame or radio subframe used for the transmission.

The receiving UE receiving one or more transmissions of the specific data block according to the dynamic scheduling signaling means that the receiving UE starts to receive the one or more transmissions at a starting position of the one or more transmissions.

The dynamic scheduling signaling at least comprises signaling DCI carried by a PDCCH channel.

As a specific embodiment, a specific implementation and beneficial effect are described, in SC-PTM, the SC-MTCH channel adopts a dynamic scheduling mechanism to schedule transmission, in order to improve the reliability of UE reception, that is, the reception success rate, multiple transmissions are required for each transport block TB on the radio interface, some UEs with good signal coverage need only receive part of the signaling to decode the TB block, and for these UEs, a method for avoiding that they continue to receive the transmission of the TB after successfully receiving one TB block needs to be provided, so as to save their battery consumption.

By the method provided by the embodiment, the resource information of multiple transmissions of one data block is indicated by one dynamic scheduling signaling, so that on one hand, the resource for transmitting the dynamic scheduling signaling is saved, and on the other hand, the UE can clearly know the multiple transmissions of one data block, so that the UE can combine the signals of the multiple transmissions of one data block to improve the receiving reliability of the signals, and after the UE successfully receives the data block, the UE can ignore the subsequent transmission of the data block, thereby saving the battery consumption.

Example 11

In an NB-IoT or eMTC system, in order to enhance coverage, when transmitting service data, PDCCH signaling DCI carrying dynamic scheduling signaling or PDSCH channel carrying data need to be repeatedly transmitted for multiple times, so as to meet the requirement of UE for receiving under deep coverage condition. In the existing scheduling manner, in order to receive one service data block, the UE needs to receive multiple repetitions of the PDCCH (repetition) for scheduling the service data block, i.e., the UE continuously receives the PDCCH channel in multiple radio subframes. This scheduling is not beneficial to power saving for the UE. The embodiment provides an optimized scheduling method, which is used for saving the cost occupied by sending the PDCCH signaling DCI and the power cost of receiving the PDCCH signaling DCI by the receiving end UE under the scene of determining that one or more transmissions of one or more data blocks need to be scheduled.

In the embodiment of the invention, the access network element indicates the information of a plurality of transmission resources by signaling in one scheduling for one or more transmissions of one or more data blocks.

And the access network element transmits one or more transmissions of the one or more data blocks in the transmission resources indicated by the scheduling information. And the UE receives one or more transmissions of the one or more data blocks according to the scheduling information.

The access network indicates information of a plurality of transmission resources through signaling, and the information comprises:

1. number information (number) of the plurality of transmission resources

2. Interval information (interval) of the plurality of transmission resources

The number information and the interval information of the plurality of transmission resources are indicated by dynamic scheduling signaling PDCCH DCI, or semi-static signaling, such as a system message, an RRC message, or a common control message of the transmitted service, respectively.

In specific implementation, the indication method of the number information and the interval information is selected according to the requirements of the transmitted service.

One of the preferred indication methods is that the access network element indicates the number information of the plurality of transmission resources through semi-static signaling, and indicates the interval information of the plurality of transmission resources through dynamic scheduling signaling PDCCH DCI.

And the second preferred indication method is that the access network element indicates the intervals of the plurality of transmission resources through dynamic signaling and indicates the number information of the plurality of transmission resources through semi-static signaling.

The third preferred indication method is that the access network indicates the number information and the interval information of the plurality of transmission resources through dynamic signaling.

The preferred indication method is that the access network element indicates the number information and the interval information of the plurality of transmission resources through semi-static signaling.

Optionally, the scheduling information of the plurality of transmission resources further includes: a starting position of a first transmission resource in the plurality of transmission resources, wherein the starting position is a combination of an H-SFN and an SFN number or a relative time interval relative to a transmission starting time or a transmission ending time of the dynamic scheduling signaling;

the starting position is indicated by semi-static signaling or dynamic scheduling signaling.

In this embodiment, one transmission of a data block includes one or more repeated transmissions (Repetition) of physical channel data carrying the specific data block on the radio interface, that is, the physical channel carrying the data block is repeatedly transmitted in a plurality of radio subframes of the radio interface, for example, in NB-IoT or eMTC, the PDSCH carrying one transport block (transmission block) continuously occupies a plurality of available radio subframes on the radio interface, and the PDSCH carrying the transport block is repeatedly transmitted in the subframes.

In the embodiment of the present invention, the transmission resource refers to a radio subframe resource used for transmitting a data block in one transmission, for example, in NB-IoT and eMTC systems, one transmission resource includes a plurality of continuously available radio subframes, that is, the number of times of repeated data transmission in one transmission. The number of radio subframes included in one transmission resource may be indicated by dynamic scheduling signaling or semi-static signaling.

The interval information of the plurality of transmission resources refers to an interval between two adjacent transmission resources in the plurality of transmission resources, including an interval between a first radio subframe of two adjacent transmission resources, an interval between a last radio subframe of two adjacent transmission resources, or an interval between a last radio subframe of a previous transmission resource and a first radio subframe of a subsequent transmission resource. The interval is expressed in time units of seconds or milliseconds, or as the number of radio subframes, radio frames, radio superframes (H-SFNs).

The number information of the plurality of transmission resources refers to the number of transmission resources included in the plurality of transmission resources.

The plurality of transmission resources are used for one or more transmissions of one or more data blocks including, but not limited to:

1. the plurality of transmission resources are used for multiple transmissions of a data block.

2. The plurality of transmission resources are used for one or more transmissions of a plurality of different data blocks.

Alternatively, the scheduling method provided in this embodiment may be periodically applied to scheduling of service data or common control channels. For example, in the scheduling of the SC-MCCH, the method of the present embodiment is applied in a repetition period of each SC-MCCH, i.e. in each SC-MCCH repetition period, the access network element indicates, by signaling, information of one or more transmission resources used for transmitting one or more fragments (segments) of the SC-MCCH message, and specifically, the access network element sends one or more repetitions of dynamic scheduling signaling in the SC-MCCH repetition period, and indicates, by the dynamic scheduling signaling and the semi-static signaling, information of one or more transmission resources.

Fig. 9 shows a specific implementation method of this embodiment, in which the number of multiple transmission resources scheduled at a time, the interval between transmission resources, the number of radio subframes (the number of repeated transmissions in one transmission of a data block) included in each transmission resource, and the start position of the first transmission resource are indicated in dynamic scheduling signaling or semi-static signaling.

Fig. 10 is a schematic structural diagram of a multicast service transmission device according to a first embodiment of the present invention, where the multicast service transmission device according to the embodiment of the present invention is applicable to an access network element, and as shown in fig. 10, the multicast service transmission device according to the embodiment of the present invention includes:

a scheduling unit 70, configured to schedule, on the radio interface, transmission of MBMS service data packets carried by the N multicast transmission channels SC-MTCH; n is an integer greater than or equal to 2.

On the basis of the transmission device of the multicast service shown in fig. 10, the transmission device of the multicast service according to the embodiment of the present invention further includes:

an indication unit (not shown in fig. 10) for indicating repeated scheduling information for scheduling the MBMS service data packet to a receiver when the scheduling unit schedules transmission of the MBMS service data packet.

and a numbering unit (not shown in fig. 10) for numbering the MBMS service data packets, so that the numbering of the MBMS service data packets is recycled in the numbering range.

A notification unit (not shown in fig. 10) configured to notify the receiver of the number N of times of MBMS service packet scheduling through a system message or a multicast control channel MCCH message.

In the embodiment of the present invention, the scheduling unit is further configured to continuously schedule N times of MBMS service data packets for an MBMS service data packet.

It should be understood by those skilled in the art that the implementation functions of the units in the transmission apparatus of the multicast service shown in fig. 10 can be understood with reference to the foregoing description of the transmission method of the multicast service. The functions of the units in the multicast service transmission apparatus shown in fig. 10 may be implemented by a program running on a processor or by a specific logic circuit.

Fig. 11 is a schematic structural diagram of a multicast service transmission device according to a second embodiment of the present invention, where the multicast service transmission device according to the embodiment of the present invention is applicable to an access network element, and as shown in fig. 11, the multicast service transmission device according to the embodiment of the present invention includes:

A setting unit 80, configured to specify or agree on feedback channel resources for feedback information of downlink scheduling transmission of MBMS service data packets;

a receiving unit 81, configured to trigger a retransmission unit after receiving feedback information of downlink scheduling transmission of the MBMS service data packet on the feedback channel resource;

and a retransmission unit 82, configured to retransmit the MBMS service data packet.

In the embodiment of the present invention, the retransmission unit 82 is further configured to:

after receiving the failure feedback information of the current scheduling, the receiving unit 81 resends the data packet.

On the basis of the transmission device of the multicast service shown in fig. 11, the transmission device of the multicast service according to the embodiment of the present invention further includes:

an indication unit (not shown in fig. 11) configured to indicate that the MBMS service data packet is transmitted for the first time, or indicate the number of the MBMS service data packet and be transmitted for the first time, by scheduling PDCCH signaling or other signaling of the MBMS service data packet when the MBMS service data packet is scheduled for the first time.

It should be understood by those skilled in the art that the implementation functions of the units in the transmission apparatus of the multicast service shown in fig. 11 can be understood with reference to the foregoing description of the transmission method of the multicast service. The functions of the units in the multicast service transmission apparatus shown in fig. 11 may be implemented by a program running on a processor or by a specific logic circuit.

Fig. 12 is a schematic structural diagram of a multicast service transmission device according to a third embodiment of the present invention, where the multicast service transmission device according to the embodiment of the present invention is applicable to user preparation, and as shown in fig. 12, the multicast service transmission device according to the embodiment of the present invention includes:

a receiving unit 90, configured to receive control information indicating, by a receiving access network element, a service receiving state fed back by a transmission device of the multicast service through a system information block or an SC-MCCH channel;

A sending unit 91, configured to feed back the state of the UE receiving service according to the control information of the feedback service receiving state.

RRC message.

It will be appreciated by those skilled in the art that the implementation functions of the units in the transmission apparatus of multicast service shown in fig. 12 can be understood with reference to the foregoing description of the transmission method of multicast service. The functions of the units in the multicast service transmission apparatus shown in fig. 12 may be implemented by a program running on a processor or by a specific logic circuit.

The embodiment of the invention also discloses a service transmission device, which comprises:

The MTP is configured for the transmission channel, which comprises one or more of the following information combinations: length information of the MTP;

The service transmission device according to the embodiment of the present invention can be understood by referring to the related embodiments of the foregoing service transmission method.

The embodiment of the invention also discloses a transmission device of the multicast service, which comprises the following steps:

The scheduling of the one or more transmissions includes:

The service transmission device according to the embodiment of the present invention can be understood by referring to the related embodiments of the foregoing multicast service transmission method.

The feedback conditions include at least one of: and feeding back threshold condition information and feedback limiting condition information.

The indication unit indicates the scheduling parameters through SC-MCCH information, or system information block SIB, or PDCCH DCI for scheduling MBMS service data packets.

The apparatus further comprises:

The embodiment of the invention also discloses a transmission device of the multicast service, which comprises:

In the embodiment of the application, the transmission resource refers to a wireless subframe resource used for transmitting the data block for one time;

In the description of the present application, the form of the MBMS service data packet includes: a medium access control protocol data unit (MAC PDU) carrying MBMS service data, or a protocol data unit (RLC PDU) of a radio link control protocol.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.

The units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware associated with program instructions, where the foregoing program may be stored in a computer readable storage medium, and when executed, the program performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read Only Memory (ROM), a magnetic disk or an optical disk, or the like, which can store program codes.

Alternatively, the above-described integrated units of the present invention may be stored in a computer-readable storage medium if implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a mobile storage device, a Read Only Memory (ROM), a magnetic disk or an optical disk, or the like, which can store program codes.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting multicast service, the method comprising:

the network element of the access network dispatches the transmission of MBMS business data packet carried by the multicast transmission channel SC-MTCH for N times at the wireless interface; n is an integer greater than or equal to 2;

the method further comprises the steps of:

the access network element indicates repeated scheduling information for scheduling the MBMS data packet to a receiver when scheduling the transmission of the MBMS data packet;

the repeated schedule information includes at least one of the following information:

the serial number of the present scheduling, whether the present scheduling is the first scheduling of the MBMS data packet, the remaining scheduling times of the MBMS data packet, the serial number of the MBMS data packet;

the method further comprises the steps of:

the access network element schedules M times of MBMS service data packets or schedules M times of MBMS service data packets at most in the scheduling period of the SC-MTCH of each MBMS service data packet;

the scheduling comprises repeated transmission of a Physical Downlink Control Channel (PDCCH) of M1 times and repeated transmission of a Physical Downlink Shared Channel (PDSCH) of M2 times aiming at the MBMS data packet; m1 and M2 are both less than or equal to N.

2. The method for transmitting multicast traffic according to claim 1, wherein the method further comprises:

3. The method for transmitting multicast traffic according to claim 1, wherein the method further comprises:

4. The method for transmitting the multicast service according to claim 1, wherein said scheduling N times of transmission of the MBMS service data packet at the radio interface includes:

5. The method for transmitting multicast service according to claim 1, wherein the repeated scheduling information is indicated by a physical downlink control channel PDCCH signaling for scheduling the MBMS service data packet.

6. A method for transmitting multicast service, the method comprising:

the User Equipment (UE) receives the SC-MTCH data packet sent by the network element of the access network according to the repeated scheduling information of each MBMS data packet;

the repeated schedule information includes at least one of the following information: the serial number of the present scheduling, whether the present scheduling is the first scheduling of the MBMS data packet, the remaining scheduling times of the MBMS data packet, the serial number of the MBMS data packet; the scheduling comprises repeated transmission of a Physical Downlink Control Channel (PDCCH) of M1 times and repeated transmission of a Physical Downlink Shared Channel (PDSCH) of M2 times aiming at the MBMS data packet; m1 and M2 are both less than or equal to N;

The method further comprises the steps of: when the UE successfully receives one MBMS service data packet, the UE does not receive the subsequent repeated scheduling of the MBMS service data packet any more, and when the UE fails to receive the MBMS service data packet, the UE always receives the subsequent repeated scheduling of the MBMS service data packet until the MBMS service data packet is successfully received or detects the scheduling of a new MBMS service data packet;

wherein, the UE successfully receives the MBMS service data packet, including:

the number of the MBMS data packet received by the UE is the same as the number of the MBMS data packet contained in the repeated scheduling information; or alternatively, the process may be performed,

and the UE successfully receives the MBMS data packet in the scheduling period of the MBMS data packet.

7. A method for transmitting multicast service, the method comprising:

the access network element configures a multiple transmission period MTP for a transmission channel, and schedules one or more specific service data packets at a time in the MTP; one complete scheduling transmission, including PDCCH signaling DCI and PDSCH scheduled by the DCI;

the length information of the MTP and the offset information of the starting position of the MTP; repeatedly transmitting the frequency information of the specific service data packet at the MTP;

The offset of the starting position of the MTP is calculated by the following formula:

(H-SFN×1024+SFN)mod L＝offset；

wherein, H-SFN is the system super frame number, SFN is the system frame number, mod is the modulo operation, L is the length of MTP, and offset is the offset of the starting position of MTP;

scheduling one of the specific service data packets in an MTP includes:

the specific service data packet is scheduled for multiple times in one MTP; alternatively, the specific service data packet is scheduled in a plurality of continuous or discontinuous MTPs;

the method further comprises the steps of:

when the access network element schedules the specific service data packet in the MTP, only one or more times of the same specific service data packet is scheduled in one MTP.

8. A method for transmitting multicast service, the method comprising:

the UE receives one or more schedules of the service data packets in one or more multi-transmission periods MTP of the scheduled service data packets; one complete scheduling transmission, including PDCCH signaling DCI and PDSCH scheduled by the DCI;

the method further comprises the steps of:

when the transmission channel adopts dynamic scheduling, the UE receives a PDCCH channel in the MTP to detect PDCCH signaling DCI for scheduling the transmission channel; receiving a PDSCH channel carrying service data indicated by the DCI according to the received PDCCH signaling DCI for scheduling the transmission channel;

The method further comprises the steps of:

when multiple times of scheduling of one service data packet are all in the same MTP, and one MTP only schedules the same service data packet once or multiple times, the UE judges that the service data packets scheduled in different MTPs are different service data packets according to the boundary of the MTP;

the method further comprises the steps of:

9. The method for transmitting multicast traffic according to claim 8, wherein the method further comprises:

10. A method for transmitting multicast service, the method comprising:

the access network element indicates the scheduling information of multiple transmissions of a specific service data packet through a dynamic scheduling signaling, so that the UE receives the specific service data packet according to the dynamic scheduling signaling;

Starting position information of multiple transmissions, wherein the starting position information is a combination of a system super frame number H-SFN and a system frame number SFN; or the relative time interval size relative to the starting or ending time of the dynamic scheduling signaling; or the time interval between the starting position of the latter transmission and the starting position of the former transmission;

the number of the transmissions and the time interval between each transmission are the starting position or the ending position of the two transmissions;

the scheduling information also comprises the frequency information that the physical channel data carrying the specific service data packet is repeatedly transmitted on the wireless interface in the multiple transmission;

the scheduling of the multiple transmissions includes:

the same specific service data packet is sent for a plurality of times in the wireless interface;

each transmission includes repeated transmission of physical channel data carrying the service data packet over the wireless interface several times.

11. The method of claim 10, wherein the scheduling of the one or more transmissions comprises:

12. The method of claim 10, wherein the scheduling information further comprises frequency domain resource information used for each transmission; the frequency domain resource information includes at least one of the following information: the frequency of the carrier wave used by the transmission, the indication of whether to carry out frequency hopping transmission, and the information of the physical resource block PRB used by the transmission.

13. The method of claim 10, wherein the starting or ending position is a position of a first or last radio frame or radio subframe used for the transmission.

14. A method for transmitting multicast service, the method comprising:

the UE receives multiple transmissions of a specific service data packet according to a dynamic scheduling signaling sent by an access network element;

the dynamic scheduling signaling indicates scheduling information of multiple transmissions of a specific service data packet;

each of the plurality of transmissions includes repeated transmissions of physical channel data carrying the service data packet over the wireless interface a number of times.

15. A method for transmitting multicast service, the method comprising:

the access network element indicates the scheduling parameters of the data packet of the UEMBMS through signaling, wherein the scheduling parameters comprise at least one of the following: the repeated factors, coverage grade information and the receiving success rate/failure rate threshold used when the MBMS data packet is scheduled;

the coverage grade information refers to a coverage grade of which the repetition factor can ensure a certain receiving success rate, or refers to a threshold of reporting the coverage grade of the UE by the UE;

the repetition factor is used for indicating the repeated transmission times of the wireless interface when the transmission block TB carrying the MBMS data packet is transmitted and/or the repeated transmission times of the physical control channel signaling DCI when the transmission block is scheduled;

the method further comprises the steps of:

16. The method of claim 15 wherein the reception success rate/failure rate threshold refers to a success rate or failure rate of MAC PDUs received by the UE, or a success rate or failure rate of RLC PDUs received by the UE, or a success rate or failure rate of PDCP PDUs received by the UE, when the UE receives the MBMS service data packet.

17. The method according to claim 15, wherein the access network element indicates the scheduling parameters via SC-MCCH messages, or system information blocks SIBs, or PDCCH DCIs scheduling MBMS service data packets.

18. A method for transmitting multicast service, the method comprising:

in one-time scheduling, the access network element indicates information of a plurality of transmission resources through signaling and is used for one-time transmission of a plurality of data;

the information of the plurality of transmission resources includes: the number information of the plurality of transmission resources and the interval information of the plurality of transmission resources;

the method further comprises the steps of:

the quantity information and the interval information of the plurality of transmission resources are respectively indicated through dynamic scheduling signaling PDCCH DCI or semi-static signaling;

the transmission resource refers to a wireless subframe resource used for transmitting the data block for one time;

the interval information of the plurality of transmission resources refers to an interval between two adjacent transmission resources in the plurality of transmission resources, including an interval between a first radio subframe of two adjacent transmission resources, an interval between a last radio subframe of two adjacent transmission resources, or an interval between a last radio subframe of a previous transmission resource and a first radio subframe of a subsequent transmission resource;

The scheduling of the one transmission includes:

the physical channel data carrying the specific service data packet is repeatedly transmitted at the wireless interface for a plurality of times.

19. The method of claim 18, wherein the access network element transmits the plurality of data once in a transmission resource indicated by the scheduling information.

20. The method of claim 18, wherein the number information and the interval information of the plurality of transmission resources are indicated by dynamic scheduling signaling, PDCCH, DCI, or semi-static signaling, respectively, comprising:

21. The method of claim 18, wherein the number information and the interval information of the plurality of transmission resources are indicated by dynamic scheduling signaling, PDCCH, DCI, or semi-static signaling, respectively, comprising:

22. The method of claim 18, wherein the number information and the interval information of the plurality of transmission resources are indicated by dynamic scheduling signaling, PDCCH, DCI, or semi-static signaling, respectively, comprising: the access network element indicates the quantity information and the interval information of the plurality of transmission resources through dynamic signaling.

23. The method of claim 18, wherein the number information and the interval information of the plurality of transmission resources are indicated by dynamic scheduling signaling, PDCCH, DCI, or semi-static signaling, respectively, comprising:

24. The method of claim 18, wherein the information of the plurality of transmission resources further comprises: a starting position of a first transmission resource in the plurality of transmission resources, wherein the starting position is a combination of a system super frame number H-SFN and a system frame number SFN, or a relative time interval of a transmission starting time or a transmission ending time relative to the dynamic scheduling signaling;

25. An apparatus for transmitting multicast traffic, the apparatus comprising:

a scheduling unit, configured to schedule, at a radio interface, transmission of an MBMS service data packet carried by an SC-MTCH of N times of multicast transmission channels; n is an integer greater than or equal to 2;

an indication unit, configured to indicate, to a receiver, repeated scheduling information for scheduling the MBMS service data packet when the scheduling unit schedules transmission of the MBMS service data packet;

26. The apparatus of claim 25, wherein the apparatus further comprises:

and the numbering unit is used for numbering the MBMS data packets so as to enable the MBMS data packets to be numbered.

27. The apparatus of claim 25, wherein the apparatus further comprises:

28. The apparatus of claim 25, wherein the scheduling unit is further configured to schedule N MBMS service data packets consecutively for one MBMS service data packet.

29. The apparatus of claim 25, wherein the repeated scheduling information is indicated by a physical downlink control channel, PDCCH, signaling scheduling the MBMS service data packet.

30. An apparatus for transmitting multicast traffic, the apparatus comprising:

a scheduling unit, configured to schedule one or more specific MBMS service data packets at a time in the MTP;

one complete scheduling transmission, including PDCCH signaling DCI and PDSCH scheduled by the DCI;

the length information of the MTP, the offset information of the starting position of the MTP and the frequency information of repeatedly transmitting the specific MBMS data packet at the MTP;

(H-SFN×1024+SFN)mod L＝offset；

scheduling one of the specific service data packets in an MTP includes:

When the scheduling unit schedules the specific service data packet in the MTP, the scheduling unit only schedules one or more times of the same specific service data packet in one MTP.

31. An apparatus for transmitting multicast traffic, the apparatus comprising:

the indication unit is used for indicating the scheduling information of the multiple transmissions of the specific MBMS data packet through the dynamic scheduling signaling, so that the UE receives the specific MBMS data packet according to the dynamic scheduling signaling;

The scheduling of the multiple transmissions includes:

the same specific MBMS data packet is sent for a plurality of times in the wireless interface;

32. An apparatus for transmitting multicast traffic, the apparatus comprising:

an indication unit, configured to indicate, through signaling, a scheduling parameter of a ue mbms service data packet, where the scheduling parameter includes at least one of the following: the repeated factors, coverage grade information and the receiving success rate/failure rate threshold used when the MBMS data packet is scheduled;

and when the indication unit does not indicate the coverage grade information, the UE obtains the coverage grade information from the repetition factor and the mapping relation between the repetition factor indicated by protocol convention or signaling and the coverage grade.

33. The apparatus of claim 32, wherein the indication unit indicates the scheduling parameters via SC-MCCH message, or system information block SIB, or PDCCH DCI scheduling MBMS service data packets.

34. An apparatus for transmitting multicast traffic, the apparatus comprising:

a receiving unit, configured to receive one or more schedules of a service data packet in one or more multiple transmission periods MTP of the scheduled service data packet; one complete scheduling transmission, including PDCCH signaling DCI and PDSCH scheduled by the DCI;

the apparatus further comprises:

the judging unit is used for judging that the scheduled service data packets in different MTPs are different service data packets according to the boundary of the MTPs when the multiple schedules of one service data packet are in the same MTP and one MTP only schedules the same service data packet once or multiple times;

When the access network element indicates the number of times of scheduling the specific service data packet in one MTP, the number of times of receiving the specific service data packet in one MTP by the receiving unit does not exceed the indicated number of times.

35. An apparatus for transmitting multicast traffic, the apparatus comprising:

a transmission unit, configured to indicate information of a plurality of transmission resources by signaling in one scheduling, for one transmission of a plurality of data;

the apparatus further comprises:

The scheduling of the one transmission includes:

36. The apparatus of claim 35, wherein the means for transmitting is further configured to transmit the plurality of data once in a transmission resource indicated by scheduling information.