WO2018027817A1

WO2018027817A1 - Multicast data transmission method and device

Info

Publication number: WO2018027817A1
Application number: PCT/CN2016/094707
Authority: WO
Inventors: 周涵; 铁晓磊; 花梦
Original assignee: 华为技术有限公司
Priority date: 2016-08-11
Filing date: 2016-08-11
Publication date: 2018-02-15

Abstract

The present invention provides a method, a device and an apparatus for transmitting multicast data, which enable a plurality of terminal devices to receive multicast data at the same time, thereby reducing the number of retransmissions of multicast data sent by a network side device and improving utilization efficiency of downlink time-frequency resources. The method comprises: receiving, by a first terminal device, first information sent by the network side device at a first moment, the first information being used to determine a second moment, the second moment being a starting moment when the network side device sends the multicast data or downlink configuration information or a starting moment of the time period of sending the multicast data or the downlink configuration information by the network side device, the downlink configuration information being used for transmission of the multicast data, and a time interval between the first time and the second time being greater than or equal to a preset time length; and receiving, by a first terminal device, the multicast data according to the first information.

Description

Method and device for transmitting multicast data

Technical field

The present invention relates to the field of communications, and more particularly to a method and apparatus for transmitting multicast data in the field of communications.

Background technique

A Single Cell Point-to-Multipoint (SC-PTM) is a multicast-based propagation technology introduced on the Release 13 of the Long Team Evolution (LTE).

The multicast in the Narrow Band Internet of Things (NB-IoT) is mainly applied to the software update of the terminal device (for example, the smart water meter in the cell updates the firmware, updates the configuration parameters, etc.), and the terminal is required. The device must be able to completely receive data in the multicast service to perform software update. Once the terminal device receives a part of the data packet, the terminal device needs to wait for the base station to retransmit the data to the terminal device or the multicast group. Therefore, in the NB-IoT, the terminal device needs to receive the multicast service while the multicast service starts being transmitted by the network device, such as the base station.

In the SC-PTM mechanism, for a terminal device in an idle state, the base station first indicates that the terminal device system message changes through paging, and informs the terminal device to receive the multicast service through downlink signaling, and the terminal device reads the information. The system information determines the process of receiving the multicast service. The period of the paging reception and the specific time set by the system for each terminal device are different (the sleep period in the NB-IoT can be as long as 2 to 3 hours), and the terminal device that needs to receive the multicast service is awakened. It is different. Therefore, when the existing SC-PTM technology is applied to the NB-IoT, the SC-PTM mechanism is difficult for the multiple terminal devices that need to receive the multicast service to simultaneously receive the multicast service sent by the base station, and the terminal device may The multicast service cannot be completely received or the multicast service transmission time is completely missed, so that the base station needs to re-multicast or unicast this part of the service, resulting in waste of downlink time-frequency resources.

Summary of the invention

The embodiment of the invention provides a method and a device for transmitting information, which can enable multiple terminal devices to receive multicast data at the same time, thereby reducing the number of retransmissions of multicast data sent by the network side device and improving the use efficiency of downlink time-frequency resources. .

In a first aspect, a method for transmitting multicast data is provided, the method comprising: a first terminal setting Receiving, by the first time, the first information sent by the network side device, where the first information is used to determine the second time, where the second time is the start time of the network side device to send the multicast data or the downlink configuration information, or The second time is a start time of a time period in which the network side device sends the multicast data or the downlink configuration information, where the downlink configuration information is used for transmitting multicast data, between the first time and the second time The time interval is greater than or equal to the preset duration; the first terminal device receives the multicast data according to the first information.

Therefore, in the method for transmitting multicast data in the embodiment of the present invention, the terminal device can determine not only the second moment when the network side device sends the multicast data or the downlink configuration information but also the second time by receiving the first information sent by the network side device. The time interval between the moment and the first moment when the terminal device receives the first information can enable the plurality of terminal devices to enter the state of receiving the group multicast data before the network side device sends the multicast data, so that the plurality of terminal devices can be in the same state. The time completely receives the multicast data, which reduces the possibility of the terminal device missing the multicast data, thereby reducing the number of retransmissions of the multicast data transmitted by the network side device, reducing the transmission power, and improving the use efficiency of the downlink time-frequency resources. .

In conjunction with the first aspect, in a first implementation manner of the first aspect, the first time belongs to a first time period in a plurality of time periods, and the second time time belongs to a second time period in the multiple time periods.

With reference to the first aspect, in a second implementation manner of the first aspect, the first time period and the second time period are separated by N time periods, where the N is an integer greater than or equal to 0.

With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, each of the multiple time periods is a changed channel or M of the single cell multicast control channel SC-MCCH The change period, the M is an integer greater than one.

With reference to the first aspect and the foregoing implementation manner, in a fourth implementation manner of the first aspect, the method further includes: the first terminal, in the time interval, closing the receiving of the multicast data and the first information Features.

Therefore, the first terminal device can be in a dormant state during the time interval in which the multicast data is not received, which can save power consumption of the terminal device and avoid unnecessary energy consumption.

In conjunction with the first aspect and the foregoing implementation manner, in a fifth implementation manner of the first aspect, the first information is used to indicate the second moment.

With reference to the first aspect and the foregoing implementation manner, in a sixth implementation manner of the first aspect, the first information is used to indicate that the first terminal device determines the second time according to the first time and the preset time duration, And receiving, by the first terminal device, the multicast data according to the first information, including: The first terminal device determines the second moment according to the first moment and the preset duration; the first terminal device receives the multicast data according to the second moment.

In conjunction with the first aspect and the foregoing implementation manner, in the seventh implementation manner of the first aspect, the preset duration is a duration specified by the system, or the first information is further used to indicate the preset duration.

With reference to the first aspect and the foregoing implementation manner, in the eighth implementation manner of the first aspect, the first terminal device receives the multicast data according to the second time, that: the first terminal device is in the second And detecting, by the network side device, the second SC-MCCH, where the second SC-MCCH includes a session identifier of the multicast data, where the session identifier is used to uniquely identify the multicast data; the first terminal device is in the first The multicast data is received during the time period in which the second SC-MCCH is located.

With reference to the first aspect and the foregoing implementation manner, in a ninth implementation manner of the first aspect, the first terminal device receives the first information sent by the network side device at the first moment, including: the first terminal device is in the Receiving, by the network device, the first SC-MCCH, where the first SC-MCCH carries the first information, or the first terminal device receiving the broadcast channel BCH sent by the network side device at the first moment The BCH carries the first information; or the first terminal device receives the downlink physical control channel PDCCH sent by the network side device at the first time, and the PDCCH carries the first information.

With reference to the first aspect and the foregoing implementation manner, in a tenth implementation manner of the first aspect, the first information includes a session identifier of the multicast data, the session identifier is used to uniquely identify the multicast data, and Receiving, by the first terminal device, the multicast data according to the first information, the first terminal device determining, according to the session identifier, downlink configuration information corresponding to the multicast data; the first terminal device according to the multicast The downlink configuration information corresponding to the data and the second time are received by the multicast data.

A second aspect provides a method for transmitting multicast data, where the method includes: the network side device sends first information to a plurality of terminal devices, where the first information is used to determine a second moment, where the second moment is the network The start time of the time when the side device sends the multicast data or the downlink configuration information, or the second time is the start time of the time period in which the network side device sends the multicast data or the downlink configuration information, where the downlink configuration information is used for the group For the transmission of the broadcast data, the time interval between the first time and the second time is greater than or equal to the preset time length, where the first time is the time when the plurality of terminal devices receive the first information; From the second moment, the multicast data is sent to the plurality of terminal devices.

Therefore, in the method for transmitting multicast data, the network side device sends the first information to the plurality of terminal devices, so that the terminal device can determine not only the network side device to send the multicast data. Or the second moment of the downlink configuration information, and the time interval between the second moment and the first moment when the terminal device receives the first information enables the multiple terminal devices to enter the receiving group multicast before the network side device sends the multicast data. The state of the data, so that multiple terminal devices can completely receive the multicast data at the same time, thereby reducing the possibility that the terminal device misses the multicast data, thereby reducing the number of retransmissions of the network side device transmitting the multicast data, and reducing the number of times. The transmission power improves the efficiency of using downlink time-frequency resources.

With reference to the second aspect, in a first implementation manner of the second aspect, the first time belongs to a first time period in a plurality of time periods, and the second time time belongs to a second time period in the multiple time periods.

With reference to the second aspect and the foregoing implementation manner, in a second implementation manner of the second aspect, the first time period and the second time period are separated by N time periods, where the N is greater than or equal to 0 integer. .

With reference to the second aspect and the foregoing implementation manner, in a third implementation manner of the second aspect, each of the multiple time periods is a change period of the single cell multicast control channel SC-MCCH or M The change period, the M is an integer greater than one.

In conjunction with the second aspect and the foregoing implementation manner, in a fourth implementation manner of the second aspect, the first information is used to indicate the second moment.

With reference to the second aspect and the foregoing implementation manner, in a fifth implementation manner of the second aspect, the first information is used to indicate that the multiple terminal devices determine the second time according to the first time and the preset duration.

With reference to the second aspect and the foregoing implementation manner, in the sixth implementation manner of the second aspect, the preset duration is a duration specified by the system, or the first information is further used to indicate the preset duration.

With reference to the second aspect and the foregoing implementation manner, in a seventh implementation manner of the second aspect, the network side device sends the multicast data to the multiple terminal devices from the second moment, including: the network side The device sends a second SC-MCCH to the plurality of terminal devices, where the second SC-MCCH includes a session identifier of the multicast data, where the session identifier is used to uniquely identify the multicast data; the network The side device transmits the multicast data to the plurality of terminal devices during a time period in which the second SC-MCCH is transmitted.

With reference to the second aspect and the foregoing implementation manner, in the eighth implementation manner of the second aspect, the network side device sends the first information to the multiple terminal devices, where the network side device sends the first information to the multiple terminal devices. An SC-MCCH, the first SC-MCCH carries the first information; or, the network The network side device sends a broadcast channel BCH to the plurality of terminal devices, where the BCH carries the first information; or the network side device sends a downlink physical control channel PDCCH to the multiple terminal devices, where the PDCCH carries the first information.

With reference to the second aspect and the foregoing implementation manner, in a ninth implementation manner of the second aspect, the first information includes a session identifier of the multicast data, where the session identifier is used to uniquely identify the multicast data.

In a third aspect, there is provided an apparatus for transmitting multicast data, the apparatus being operative to perform the operations of the first terminal device in the first aspect or any optional implementation of the first aspect. Specifically, the first terminal device may include a module unit for performing the operations of the first terminal device in any of the above-described first aspect or any possible implementation manner of the first aspect.

A fourth aspect provides an apparatus for transmitting multicast data, where the apparatus can perform the operations of the network side device in any of the foregoing optional implementations of the second aspect or the second aspect. Specifically, the network side device may include a module unit for performing operations of the network side device in any of the possible implementation manners of the second aspect or the second aspect described above.

A fifth aspect provides an apparatus for transmitting multicast data, the apparatus comprising: a bus, a processor connected to the bus, a memory connected to the bus, and a transceiver connected to the bus, wherein the memory is used for Storing instructions for executing the memory stored instructions to control the transceiver to receive signals or to transmit signals, and when the processor executes the instructions stored by the memory, the executing causes the processor to perform the first aspect or the first A method in any possible implementation of the aspect.

In a sixth aspect, an apparatus for transmitting multicast data is provided, the apparatus comprising: a bus, a processor connected to the bus, a memory connected to the bus, and a transceiver connected to the bus, wherein the memory is used for Storing instructions for executing the memory stored instructions to control the transceiver to receive signals or to transmit signals, and when the processor executes the instructions stored by the memory, the executing causes the processor to perform the second aspect or the second A method in any possible implementation of the aspect.

According to a seventh aspect, a computer storage medium is provided, where the program code is stored in the program, and the program code is used to indicate that the first terminal device of the first aspect or the first aspect is executed by the first terminal device. operating.

According to an eighth aspect, a computer storage medium is provided, where the program code is stored to indicate that the operation performed by the network side device of the second aspect or the second aspect of the second aspect is performed. .

In combination with the implementation manners of the foregoing aspects, in some implementation manners, the multicast data is the network. The side device needs to send downlink data to the multiple terminal devices at the same time.

In combination with the foregoing implementation manners, in some implementation manners, the downlink configuration information is used to indicate a start time of the network side device to send the multicast data.

According to the method, device and device for transmitting multicast data provided by the present invention, the network side device can send the first information to the terminal device, so that the terminal device can determine not only the second moment when the network side device sends the multicast data or the downlink configuration information, Moreover, the time interval between the second moment and the first moment when the terminal device receives the first information can enable the plurality of terminal devices to enter the receiving state before the network side device sends the multicast data, so that the plurality of terminal devices can be at the same time The complete reception of the multicast data reduces the possibility that the terminal device misses the multicast data, thereby reducing the number of retransmissions of the multicast data transmitted by the network side device, reducing the transmission power, and improving the use efficiency of the downlink time-frequency resources.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below.

1 is a schematic diagram of a communication system to which an embodiment of the present invention is applied.

2 is a schematic diagram of scheduling of respective channels in a single-cell point-to-multipoint SC-PTM technique.

3 is a schematic interaction diagram of a method of transmitting multicast data according to an embodiment of the present invention.

4 is a schematic interaction diagram of a method of transmitting multicast data according to another embodiment of the present invention.

FIG. 5 is a schematic block diagram of an apparatus for transmitting multicast data according to an embodiment of the present invention.

6 is a schematic block diagram of an apparatus for transmitting multicast data according to an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of an apparatus for transmitting multicast data according to an embodiment of the present invention.

FIG. 8 is a schematic structural diagram of an apparatus for transmitting multicast data according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be understood that the technical solution of the present invention can be applied to various communication systems, for example, Global System of Mobile communication (GSM), code division multiple access (English: Code Division Multiple Access, referred to as :CDMA) system, wide With Code Division Multiple Access Wireless (WCDMA), General Packet Radio Service (English: General Packet Radio Service, GPRS for short), Long Term Evolution (LTE: LTE) Wait.

Optionally, the network side device 110 is a base station, and the terminal device 120 is a user equipment.

FIG. 1 shows a communication system 100 to which an embodiment of the present invention is applied. The communication system 100 can include at least one network side device 110. The network side device 110 may be a device that communicates with the terminal device 120, such as a base station or a base station controller or the like. Each network side device 110 can provide communication coverage for a particular geographic area and can communicate with terminal devices (e.g., UEs) located within the coverage area (cell). The network side device 110 may be a base station (Base Transceiver Station, or "BTS") in a GSM system or a Code Division Multiple Access ("CDMA") system, or may be a base station in a WCDMA system (NodeB). , referred to as "NB"), may also be an evolved base station (Evolutional Node B, "eNB" or "eNodeB") in the LTE system, or a Cloud Radio Access Network (CRAN). The wireless controller in the network, or the network side device may be a relay station, an access point, an in-vehicle device, a wearable device, a network side device in a future 5G network, or a public land mobile network (Public Land Mobile Network) Network side devices and the like in PLMN").

In the embodiment of the present invention, the communication system 100 may be a Cellular IoT ("CIoT"). The CIoT system is an important type of machine type communication (Machine Type Communication) based on the existing cellular network infrastructure. For the "MTC" communication system. The main business areas of future IoT communications may include smart meter reading, medical detection and monitoring, logistics detection, industrial inspection and monitoring, automotive networking, smart communities, and wearable device communication. The Internet of Things industry built around MTC communication is considered to be the fourth wave of the information industry after the computer, Internet and mobile communication networks, and is the future development direction of the network. In addition, the CIoT system has large coverage, high connectivity, low cost and low power consumption for networks and end devices.

The communication system 100 also includes a plurality of terminal devices 120 located within the coverage of the network side device 110. The terminal device 120 can be mobile or fixed. The terminal device 120 can refer to an access terminal, a user equipment (User Equipment, abbreviated as "UE"), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile terminal, a user terminal, a terminal, and a wireless device. Communication device, user agent or user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol ("SIP") phone, a wireless local loop. (Wireless Local Loop, referred to as "WLL") station, Personal Digital Assistant ("PDA"), handheld device with wireless communication function, computing device or other processing device connected to wireless modem, vehicle device A wearable device, a terminal device in a future 5G network, or a terminal device in a future public land mobile network (Public Land Mobile Network, referred to as "PLMN").

Optionally, the communication system 100 may include multiple network side devices and may include other numbers of terminal devices within the coverage of each network side device, and the embodiment of the present invention is not limited thereto.

Optionally, the wireless communication system 100 may further include other network entities, such as a network controller, a mobility management entity, and the like, and the embodiment of the present invention is not limited thereto.

In order to better understand the technical solution of the present invention, a brief introduction will be made to the SC-PTM technology to which the present invention is applied.

The SC-PTM technology includes two types of logical channels, namely, Single Cell Multicast Control Channel (SC-MCCH) and Single Cell Multicast Traffic Channel (SC-S-). MTCH"). The SC-MTCH is a data service channel for transmitting service data in the multicast, and the SC-MCCH is a control channel for instructing the terminal device to receive the SC-MTCH, including the information required for informing the terminal device to receive the SC-MTCH. Control information.

When transmitting the SC-PTM multicast service, the base station first needs to send a System Information Block (SIB) through a Broadcasting Channel (BCH) to inform the terminal device of the downlink configuration information of the SC-MCCH. In order for the terminal device to receive the SC-MCCH. Among them, the specific instructions of the SIB are as follows:

The modification period ("MP") of the SC-MCCH: indicates how long the SC-MCCH may change, in units of frames;

Repetition period ("RP") of the SC-MCCH: indicates how long the SC-MCCH is repeatedly sent in a change period, in units of frames;

SC-MCCH transmission subframe: indicates which subframes the SC-MCCH may transmit in one frame;

SC-MCCH Transmit Offset: Indicates the offset of the SC-MCCH transmission frame from the start of the cycle within one change period.

The SC-MCCH uses periodic transmission in time, and the terminal device will monitor the PDCCH on a subframe that may carry the SC-MCCH. In addition, in one cycle, the same SC-MCCH will be Multiple transmissions, the transmission interval is configured in RP.

The SC-MCCH includes the SC-MTCH downlink configuration information, which is specifically expressed as an SC-MTCH information table. The information table indicates how many SC-MTCHs (ie, multicast services) are currently configured in the cell, and the downlink configuration information of each SC-MTCH. Each SC-MTCH downlink configuration information includes the following contents:

Session information: Contains the session ID to distinguish the identifier of the multicast service.

The Group-Radio Network Temporary Identity (G-RNTI): The G-RNTI is used for cyclic redundancy check of Downlink Control Information (DCI). The Redundancy Check ("CRC") is partially masked.

SC-MTCH scheduling information: including receiving and sleeping information of the SC-MTCH, etc., indicating when the terminal device should receive the SC-MTCH data;

Neighbor information: The neighbor information is used to indicate whether the neighbor provides a session of interest to the user.

FIG. 2 shows a schematic diagram of scheduling of respective channels in the SC-PTM technology.

Both the SC-MTCH and the SC-MCCH are carried on the Physical Downlink Shared Channel (PDSCH), and the PDSCH is scheduled by the DCI on the Physical Downlink Control Channel ("PDCCH"). . The PDCCH includes two DCIs related to SC-PTM, one is DCI for scheduling SC-MCCH, the other is DCI for scheduling SC-MTCH, and the SC-MCCH carries control information for scheduling SC-MTCH. As described above, the SC-MCCH includes the relevant downlink configuration information of the SC-MTCH, and the control information that is also used for scheduling the SC-MTCH on the PDCCH belongs to the physical layer signaling, and the control information is used to notify the terminal device group. The location of the time-frequency resource of the broadcast data. In each MP, the above data and control information can be repeatedly transmitted. In FIG. 2, the number of occurrences of the same pattern in one MP is the number of repetitions of information sent by the network side device.

It should be understood that in the embodiments described below, the “first” and “second” are only intended to distinguish different objects, for example, in order to distinguish different moments, the scope of protection of the embodiments of the present invention should not be limited.

It should be noted that, in the embodiment of the present invention, the network side device communicates with multiple terminal devices, and the execution actions of the multiple terminal devices are the same. For convenience of description, the present invention only uses the first terminal device as an example for description. The first terminal device is any one of the plurality of terminal devices, and the terminal device #A (ie, an example of the first terminal device) is taken as an example to perform the embodiment of the present invention. Detailed description.

FIG. 3 is a schematic interaction diagram of a method for transmitting multicast data according to an embodiment of the present invention, and the method 200 includes:

S210, the network side device sends the first information to the multiple terminal devices, where the first information is used to determine the second time, where the second time is the start time of the network side device to send the multicast data or the downlink configuration information, or The second time is a start time of a time period in which the network side device sends the multicast data or the downlink configuration information, where the downlink configuration information is used for transmitting multicast data, between the first time and the second time The time interval is greater than or equal to a preset duration, where the first moment is a moment when the plurality of terminal devices receive the first information;

S220: The network side device sends the multicast data to the multiple terminal devices from the second moment.

S230. The first terminal device receives the multicast data according to the first information.

It should be understood that the multicast data is downlink data that the network side device needs to simultaneously send to multiple terminal devices.

It should be further understood that the downlink configuration information is used for the transmission of the multicast data. In addition to the role of the downlink configuration information, the downlink configuration information may be used to indicate that the network side device sends the multicast data. The starting time, and thus, the terminal device #A can determine the starting time of the network side device to send the multicast data based on the downlink configuration information.

It should be understood that the specific content of the downlink configuration information indicated in the above is only an exemplary description, and the present invention is not limited thereto. Other information that can be used for scheduling the multicast data falls within the protection scope of the present invention. For example, the downlink configuration information may also be used to indicate the transmission duration, the transmission frequency band, the transmission period, the modulation and coding mode, and the like of the multicast data. In addition, as an example and not by way of limitation, the content indicated by the downlink configuration information may also be similar to the content indicated by the scheduling information or the control information (for example, the downlink control information DCI) in the prior art. Here, in order to avoid redundancy, the details are omitted. Description.

It should also be understood that although the technical solution of the present invention is proposed for a terminal device in an idle state, the technical solution of the present invention is not limited to a terminal device in an idle state, and is also applicable to a terminal device in a connected state.

Based on the above description, the method for transmitting multicast data in the embodiment of the present invention, the terminal device not only can determine the second time when the network side device sends the multicast data or the downlink configuration information by receiving the first information sent by the network side device, and The second time and the first time when the terminal device receives the first information The time interval between the engravings enables a plurality of terminal devices to enter the receiving state before the network side device sends the multicast data, so that the plurality of terminal devices can completely receive the multicast data at the same time, thereby reducing the terminal device missing multicast. The possibility of data reduces the number of retransmissions of multicast data sent by the network side device, reduces the transmission power, and improves the efficiency of using downlink time-frequency resources.

Specifically, in the embodiment of the present invention, the preset duration is determined based on a sleep time of multiple terminal devices that need to receive multicast data. Specifically, for the terminal device in the connected state, the preset duration may be set shorter, but for the terminal device in the idle state, the period and specific reception of the paging reception configured by the system for each terminal device The timing is different. If the preset duration is set to a short time, some terminal devices with long sleep time cannot wake up in time when the network side device sends multicast data, and miss the time of receiving multicast data. Therefore, it needs to be set properly. The preset duration can ensure that a plurality of terminal devices in an idle state that need to receive multicast data can wake up in time, and the plurality of terminal devices enter the receiving state before the network side device sends the multicast data, thereby simultaneously receiving Multicast data. The preset duration may be greater than or equal to the sleep duration of the terminal device having the longest sleep duration among the plurality of terminal devices that need to receive the multicast data. If the sleep period of the terminal device having the longest sleep duration is long, in order to improve the transmission efficiency, The preset duration may also be less than the longest sleep duration, so that most terminal devices that need to receive multicast data can receive multicast data in a relatively reasonable time.

It should be noted that, as described above, the downlink configuration information is carried in the SC-MCCH, and one type of multicast data corresponds to one type of downlink configuration information, that is, the downlink configuration information and the multicast data are in one-to-one correspondence. Optionally, the first time belongs to a first time period in a plurality of time periods, and the second time belongs to a second time period in the multiple time periods.

Optionally, there is N time intervals between the first time period and the second time period, and the N is an integer greater than or equal to 0. Furthermore, the preset duration may be the N time periods.

Further, each of the plurality of time periods is a change period of the SC-MCCH or M of the change period, and the M is an integer greater than 1. In this way, the existing time period in the NB-IoT system can be used to indicate the time when the first terminal device network side device sends the multicast data, which reduces the complexity of the system.

In S210, when the network side device sends the first information to the multiple terminal devices, it may be implemented in the following three manners, but it should be understood that the three manners are only examples and are not limited, that is, the present invention is for the network. The specific manner in which the side device transmits the first information to the plurality of terminal devices is not particularly limited.

Optionally, the network side device sends the first information to the multiple terminal devices, including:

The network side device sends a first SC-MCCH to the multiple terminal devices, where the first SC-MCCH carries the first information; or

The network side device sends a broadcast channel BCH to the multiple terminal devices, where the BCH carries the first information; or

The network side device sends a downlink physical control channel PDCCH to the multiple terminal devices, where the PDCCH carries the first information.

Thus, in S210, the terminal device #A can receive the first information in the above three channels, thereby performing reception of the multicast data.

In S220, after the preset time length, that is, from the second time, the network side device starts to send multicast data to multiple terminal devices including the first terminal device. As described above, the network side device may send multicast data to the plurality of terminal device devices at the second time, or may send the multicast data to the plurality of terminal devices at any time within the time period in which the second time is located.

In S230, the terminal device #A receives the multicast data according to the first information received in S210, that is, the terminal device #A determines, according to the first information, a second time at which the multicast data needs to be received, thereby performing the Receive of multicast data.

Optionally, the method further includes: the first terminal device turns off the function of receiving the multicast data and the first information in the time interval. That is, the terminal device #A may be in a dormant state after receiving the first information to determine the transmission time of the multicast data, until the timer in the terminal device #A is before the network side device sends the multicast data. The terminal device #A is woken up from the sleep state, so that the multicast data can be completely received at the second moment when the network side device transmits the multicast data.

In this way, the terminal device #A is in a sleep state during the time interval in which the multicast data is not received, which can save power consumption and avoid unnecessary energy consumption. In the NB-IoT communication system, due to the diversity of terminal device applications and various deployment environments, the terminal devices are generally powered by batteries. If the battery is replaced for a large number of devices, high labor costs and Time cost, therefore, in the NB-IoT communication system, the terminal device is often required to have an extremely low power consumption level. Therefore, the embodiment of the present invention allows the terminal device to be in a sleep state within a time interval in which the required multicast data is not received. To achieve the goal of saving power, it is especially important for terminal equipment and the entire NB-IoT communication system.

It should be understood that the terminal device #A needs to complete one as shown in FIG. 2 before receiving the multicast data. After the series scheduling process, the multicast data can be correctly received. The detailed procedure has been described above. In order to avoid cumbersome, it will not be repeated here.

It should also be understood that the network side device repeatedly transmits multicast data in a time period, and even if the network transmission delay occurs, the terminal device #A cannot currently receive the multicast data completely, and the terminal device #A can also be in the network. The side device completely receives the multicast data when the multicast data is repeatedly sent next time.

In the embodiment of the present invention, the first information is used to determine the second moment, and there may be two cases. The terminal device #A may directly determine the second moment by using an absolute time (ie, case A), and the terminal device #A may The second time (ie, case B) is determined by the relative time. Hereinafter, the embodiments of the present invention will be described in detail in combination with the above three modes and the above two cases.

Situation A

Optionally, the first information is used to indicate a second time, where the second time is a starting time for the network side device to send the multicast data, where the second time is an absolute time, that is, an accurate time, for example, xx The time xx minutes xx seconds xx milliseconds, the terminal device #A can directly determine the second time according to the first information.

The specific process of determining the second moment by the terminal device #A will be described in detail in the following three ways of transmitting the first information to the terminal device #A.

Mode 1

Optionally, the network side device sends the first SC-MCCH to the multiple terminal devices, where the first SC-MCCH carries the first information. By way of example and not limitation, the first information may be a standby session identifier (Standby Session ID), the session ID of each specific multicast data is Session ID X, X corresponds to different multicast data, and the Session ID X corresponds to the Standby session ID. The correspondence may be specified by the protocol. Or configured by the core network or the access network, for example, Standby session ID=(Session ID X+65535) mod N. When the terminal device #A receives the first information as the Standby session ID, it can learn two types. Information: (1) Can receive multicast data after N time periods, and (2) Which multicast data is received. At the same time, the determined time is added to the downlink configuration information of the SC-MTCH corresponding to the Standby session ID, so that the terminal device #A can know that the multicast data can be received at the determined time after N time periods. After receiving the first information, the terminal device #A knows which multicast data it needs to receive at which time, and can sleep before receiving the multicast data until it wakes up before the second time starts. can.

Mode 2

Optionally, the network side device sends a broadcast information BCH to the multiple terminal devices, where the BCH carries the first information, where the first information may be carried in the MIB and the SIB, preferably carried in the SIB, and the time information is Added to the SIB, after receiving the BCH, the terminal device #A confirms the accurate time of receiving the multicast data, and can perform sleep before the second time to save power consumption, wake up before the second moment, and receive The network side device is configured to schedule the downlink control information DCI of the multicast data, and further receive the downlink configuration information in the SC-MCCH according to the DCI, and further receive the multicast data.

Mode 3

Optionally, the network side device sends a downlink physical control channel PDCCH to the multiple terminal devices, where the PDCCH carries the first information, and the remaining bits in the DCI on the PDCCH may be used to indicate the time for transmitting the multicast data, and the same reason, After receiving the PDCCH, the terminal device #A confirms the accurate time of receiving the multicast data, and can perform sleep before the second time to save power consumption, wake up before the second time, and receive the multicast data.

Situation B

When the first information is included or the first information is a preset duration, as shown in FIG. 4, in S340, the terminal device #A needs to determine the second moment according to the first information, and in S350, the terminal device # A receives multicast data according to the second time. S310, S320, and S330 respectively correspond to S210, S220, and S230 in FIG. 3, and the description is not exhaustive.

Optionally, the first information may be used to indicate that the first terminal device determines the second moment according to the first moment and the preset duration, and

Receiving, by the first terminal device, the multicast data according to the first information, including:

Determining, by the first terminal device, the second moment according to the first information;

The second terminal device receives the multicast data according to the second moment.

Specifically, after receiving the first information, the terminal device #A does not know the second time of sending the multicast data, and needs to determine according to the first information, that is, according to the first time and the preset duration. Determining the second time, as described above, the second time may be the start time of the network side device to send the multicast data or the downlink configuration information, or may be the time for the network side device to send the multicast data or the downlink configuration information. The starting moment of the cycle.

For example, taking the preset duration as four time periods as an example, the terminal device #A can determine that the network side device will send multicast data or downlink configuration information in the fifth cycle, if the network side device is in the fifth The second time determined by the terminal device #A is the start time of the network side device to send the multicast data or the downlink configuration information, if the network side device is in the first time. The multicast data or the downlink configuration information is sent in five cycles, but the multicast data or the downlink configuration information is not necessarily sent at the beginning of the fifth period, and the second time determined by the terminal device #A is the fifth time. The starting moment of the cycle. Further, after determining the second time, the terminal device #A can correctly receive the multicast data or the downlink configuration information according to the second time.

Optionally, the preset duration may be a duration specified by the system, or the first information is further used to indicate the preset duration.

Specifically, for the terminal device in the connected state, the preset duration may be the duration specified by the system, that is, the preset duration may be unchanged according to the protocol; and for the terminal device in the idle state, the preset duration is according to the first A message is determined, that is, the first information is further used to indicate the preset duration.

It should be understood that the preset duration may also be that the network side device sends the information to the terminal device #A through other information, which is not limited by the present invention.

In the embodiment of the present invention, by way of example and not limitation, the first information is used to indicate the preset duration, and the preset duration is N time periods, and may also be a frame number, and may have the following indication method:

1. The K-bit is directly used to indicate the preset duration. Specifically, the preset duration is indicated by using a bit correspondence. For example, 2 bits are used, 00 is 2 time periods, 01 is 4 time periods, and 10 is 8 time periods, and so on.

2. It is represented by the system radio frame number or superframe number corresponding to the transmission time of the multicast data or the downlink configuration information.

It should be noted that, because the time of the multiple terminal devices in the idle state from the sleep state to the awake state is different, the network side device repeatedly sends the first information multiple times in the same time period, and sends the first message each time. The preset duration varies according to the time when the network side device sends the first information, but the system sets a maximum value for the preset duration, which ensures A plurality of terminal devices that need to receive multicast data can change from a sleep state to an awake state. For example, the maximum preset duration is eight time periods, and the network side device sends multicast data or downlink configuration information in the ninth time period, and the terminal device #A wakes up to receive the first information in the first time period. For the terminal device #A, the preset duration is seven time periods, and the terminal device #B (another example of the first terminal device) wakes up to receive the first information in the third time period, for the terminal device #B It is said that the preset duration is four time periods, so the preset duration is dynamically changed for a plurality of terminal devices in the sleep state.

In some embodiments, optionally, the first terminal device receives the multicast data according to the second moment, including:

And detecting, by the first terminal, the second SC-MCCH sent by the network side device, where the second SC-MCCH includes a session identifier of the multicast data, where the session identifier is used to uniquely identify the multicast data;

The first terminal device receives the multicast data in a time period in which the second SC-MCCH is located.

It should be noted that the session identifier is the above-mentioned session ID X. The first information in this embodiment may be a standby session ID, or other information, as long as the information can indicate The relationship between the preset duration and the session identifier is sufficient.

When the first information is a Standby session ID, the terminal device #A may receive downlink configuration information at the second time, and may also be the multicast data.

According to the foregoing description of the Standby session ID, when the terminal device #A receives the first information as a Standby session ID, it can obtain two kinds of information: (1) can receive multicast data after N time periods, ( 2) Receive multicast data whose session ID is Session ID X. However, for the terminal device #A, the determination time of the multicast data transmission is not known, and the terminal device #A needs to wake up before the N+1th time period after the current time period, in the (N+1)th time period. Start waiting to receive multicast data.

For example, the second information of receiving the multicast data is described in detail by taking the first information in the SC-MCCH as an example.

The terminal device #A waits to receive the multicast data in the N+1th time period, and receives the SC-MCCH before receiving the multicast data according to the scheduling procedure, so as to correctly receive the multicast data. The terminal device #A detects the SC-MCCH received in the (N+1)th time period, and if the SC-MCCH includes the Session ID X, it indicates that the SC-MCCH includes the multicast data. Downlink configuration information so that the multicast data can be received in the current time period.

That is, the second time is the start time of the downlink configuration information sent by the network side device, or the second time is the start time of the time period in which the network side device sends the downlink configuration information or the multicast data. Further, if the terminal device #A receives the SC-MCCH, that is, the downlink configuration information, at the start time of the (N+1)th time period, the second time is the start time of the network side device to send the downlink configuration information; If the terminal device #A receives the SC-MCCH, that is, the downlink configuration information, at the non-starting time in the (N+1)th time period, the second time is that the network side device sends the downlink configuration information. The start time of the time period of the interest or the multicast data.

In some embodiments, the terminal device #A may receive the first information multiple times, and the terminal device #A detects the second SC-MCCH that does not include the Session ID X after receiving the first information. Sleeping for a preset period of time, and waking up at the end of the preset duration to receive the first information again, and sleep again until after receiving the first information at the last time (ie, the first moment), the preset After receiving the second SC-MCCH including the Session ID X, the downlink configuration information corresponding to the multicast data is received, so that the multicast data is received within a time period in which the second SC-MCCH is received. It should be understood that the preset durations after receiving the first information may be equal or not equal.

As described above, the specific process of determining the second time by the terminal device #A according to the first time and the preset duration is described in detail in the following three manners of transmitting the first information to the terminal device #A.

Mode 1

Optionally, the network side device sends the first SC-MCCH to the multiple terminal devices, where the first SC-MCCH carries the first information.

By way of example and not limitation, the first information may be the standby session ID (Standby session ID), and the role of the Standby session ID is the same as that described above. To avoid cumbersome, it will not be described in detail herein.

After receiving the first SC-MCCH including the Standby session ID, the terminal device #A can obtain two kinds of information: (1) can receive multicast data after N time periods, and (2) receive the session identifier as a session ID. X multicast data. Therefore, the terminal device #A needs to wait for the reception of the multicast data at the N+1th time period.

Similarly, terminal device #A waits to receive the multicast data in the N+1th time period, and there are two cases. The multicast data may be received in the N+1th time period, and may also be used. The downlink configuration information for receiving the multicast data: if the terminal device #A receives the downlink configuration information in the N+1th time period, the second time is the start time of the network side device sending the downlink configuration information, or The second time is the start time of the time period in which the network side device sends the downlink configuration information; if the terminal device #A receives the multicast data in the (N+1)th time period, the second time is the network side. The start time of the time period during which the device sends the multicast data;

The detailed detailed process is the same as the above description and will not be repeated here.

Mode 2

Optionally, the network side device sends a broadcast channel BCH to the multiple terminal devices, where the BCH carries the first information.

The first information may be carried in the MIB and the SIB. Preferably, the first information is carried in the SIB.

As described above, the first information may be used to indicate a preset duration, and the preset duration may be a time period, or may be represented by a frame number, or may be represented by a Standby session ID. Herein, an embodiment of the present invention will be described with a frame number as an example.

According to the scheduling process, when the first information is carried in the BCH, the terminal device #A needs to receive the DCI for scheduling the multicast data on the PDCCH and the SC-MCCH according to the DCI before receiving the multicast data. And SC-MTCH (multicast data).

Therefore, in this case, the second time is a start time of a time period in which the network side device sends the multicast data.

For example, a cell in which a plurality of terminal devices including the terminal device #A starts to transmit a BCH has a radio frame number of 00, a sequence number of 0, and each frame is 10 ms, and the network side device adds and transmits multicast data in the first information. The radio frame number is the sequence number of 15, which means that the network side device needs to send the multicast data after 150 ms, and the terminal device #A needs to wake up at the beginning of the time period where the radio frame number of sequence number 15 is located, and receive the DCI and corresponding The SC-MCCH, in turn, receives the SC-MTCH carrying the multicast data, and the SC-MTCH carrying the multicast data is the radio frame number with sequence number 15. Of course, it can also be represented by a superframe number for transmitting multicast data, which will not be described here.

Mode 3

Optionally, the network side device sends a downlink physical control channel PDCCH to the multiple terminal devices, where the PDCCH carries the first information.

As described above, the first information may be used to indicate a preset duration, and the preset duration may be a time period, or may be represented by a frame number, or may be represented by a Standby session ID. In this embodiment, the remaining bits in the DCI on the PDCCH may be used to indicate the time for transmitting the multicast data. The manner of indicating the preset duration is referred to the foregoing description, and is not cumbersome here.

Therefore, the terminal device #A first determines, according to the first information, the second time to send the multicast data, enters the dormant state before the second time, does not receive the multicast data, and before the second time of transmitting the multicast data Wake up to receive the multicast data according to the scheduling process.

In this case, the second time is the start time of the time period in which the network side device sends the multicast data.

Each type of multicast data corresponds to a type of downlink configuration information. When there is only one downlink configuration information of the multicast data in the SC-MCCH, the terminal device #A can directly receive the multicast data according to the second time. However, the SC-MCCH may also include multiple downlink configuration information corresponding to multiple multicast data. When receiving the SC-MCCH, the terminal device #A does not know which downlink configuration information is needed by itself, and therefore needs to be Determining the downlink configuration information of the multicast data that is required by the multiple downlink configuration information,

Optionally, the first information includes a session identifier of the multicast data, where the session identifier is used to uniquely identify the multicast data, and

Determining, by the first terminal device, downlink configuration information corresponding to the multicast data according to the session identifier;

The first terminal device receives the multicast data according to the downlink configuration information corresponding to the multicast data and the second time.

The network side device may add a session identifier in the first information, so that the terminal device #A can find the downlink configuration information corresponding to the multicast data that it needs in the multiple downlink configuration information, and further, according to the downlink configuration information and the first At the second moment, the multicast data is received.

It should be understood that, in the three manners in which the network side device described above sends the first information, the session identifier and the preset duration may also be carried in different channels. For example, the remaining bits in the DCI may be used to indicate the preset duration, and the session identifier that identifies the multicast data is added to the session identifier of the actual multicast data in the SIB in the SIB in the BCH, and the session identifier may be used. Identifying the mapping relationship between the occupied bits and the multicast data to indicate specific multicast data. For example, there are two types of multicast data configuration information in the SC-MCCH. In the SIB, the session ID is represented by 4 bits. 1, the session ID 2 is represented by 5 bits, that is, the terminal device #A can determine the session identifier corresponding to the multicast data to be received according to the size of the session identifier, so that the plurality of downlink configuration information can be determined to be received by the user. The downlink configuration information corresponding to the multicast data, and further receives the multicast data.

Therefore, the method for transmitting multicast data provided by the present invention, on the one hand, the network side device sends the first information to the terminal device, so that the terminal device can determine not only the second moment when the network side device sends the multicast data or the downlink configuration information, Moreover, the time interval between the second moment and the first moment when the terminal device receives the first information can enable the plurality of terminal devices to enter the receiving state before the network side device sends the multicast data, so that the plurality of terminal devices can be at the same time Receive multicast completely The data reduces the possibility that the terminal device misses the multicast data, thereby reducing the number of retransmissions of the multicast data sent by the network side device, and improving the use efficiency of the downlink time-frequency resources;

On the other hand, the terminal device can be in a sleep state before receiving multicast data, which can save power consumption and avoid unnecessary energy consumption.

The method for transmitting multicast data according to an embodiment of the present invention is described in detail above with reference to FIG. 1 to FIG. 4. In the following, an apparatus for transmitting multicast data according to an embodiment of the present invention is described with reference to FIG. 5 to FIG. The technical features described are equally applicable to the following device embodiments.

FIG. 5 shows an apparatus 400 for transmitting multicast data according to an embodiment of the present invention. The apparatus may be a first terminal device, and the apparatus 400 includes:

The first receiving module 410 is configured to receive, by the first terminal device, the first information sent by the network side device, where the first information is used to determine a second time, where the second time is the network side device sends the multicast The start time of the data or the downlink configuration information, or the second time is the start time of the time period in which the network side device sends the multicast data or the downlink configuration information, and the downlink configuration information is used for the transmission of the multicast data. The time interval between the first moment and the second moment is greater than or equal to a preset duration;

The second receiving module 420 is configured to receive, by the first terminal device, the multicast data according to the first information received by the first receiving module 410.

Therefore, the apparatus for transmitting multicast data provided by the present invention receives the first information sent by the network side device, so that the terminal device can determine not only the second moment when the network side device sends the multicast data or the downlink configuration information, but also the second moment. The time interval between the moment and the first moment when the terminal device receives the first information enables the plurality of terminal devices to enter the receiving state before the network side device sends the multicast data, so that the plurality of terminal devices can completely receive the group at the same time. The broadcast data reduces the possibility that the terminal device misses the multicast data, thereby reducing the number of retransmissions of the multicast data transmitted by the network side device and improving the use efficiency of the downlink time-frequency resources.

Optionally, the first time belongs to a first time period in a plurality of time periods, and the second time belongs to a second time period in the multiple time periods.

Optionally, there is N time periods between the first time period and the second time period, and the N is an integer greater than or equal to 0.

Optionally, each of the plurality of time periods is a change period of the single cell multicast control channel SC-MCCH or M of the change period, and the M is an integer greater than 1.

Optionally, the first receiving module 410 is further configured to: close and receive the first time in the time interval. The function of the information; and the second receiving module 420 is further configured to: close the function of receiving the multicast information during the time interval.

In this way, the first terminal device is in a sleep state during the time interval in which the multicast data is not received, which can save power consumption and avoid unnecessary energy consumption.

Optionally, the first information is used to indicate the second moment.

Optionally, the first information is used to indicate that the first terminal device determines the second moment according to the first moment and the preset duration, and

The device also includes:

a determining module 430, configured to determine, by the first terminal device, the second moment according to the first moment and the preset duration;

The second receiving module is specifically configured to:

The first terminal device receives the multicast data according to the second moment.

The preset duration is a duration specified by the system, or the first information is further used to indicate the preset duration.

Optionally, the apparatus further includes a detection module 440:

Detecting, by the first terminal device, the second SC-MCCH sent by the network side device, where the second SC-MCCH includes a session identifier of the multicast data, where the session identifier is used to uniquely identify the group Broadcast data

Optionally, the first receiving module 410 is specifically configured to:

Receiving, by the first terminal device, the first SC-MCCH sent by the network side device, where the first SC-MCCH carries the first information; or

Receiving, by the first terminal device, the broadcast channel BCH sent by the network side device, where the BCH carries the first information; or

The first terminal device receives the downlink physical control channel PDCCH sent by the network side device at the first time, and the PDCCH carries the first information.

The determining module 430 is further configured to:

Determining, by the first terminal device, a downlink configuration information corresponding to the multicast data according to the session identifier Interest;

The second receiving module 420 is further specifically configured to:

The device 400 for transmitting multicast data according to the embodiment of the present invention may correspond to the first terminal device in the method of the embodiment of the present invention, and each unit in the device 400 for transmitting the multicast data is a module and the foregoing other operations and/or The functions are respectively implemented in order to implement the corresponding processes performed by the first terminal device in the

method

200 or 300, and are not cumbersome here for brevity.

Therefore, the apparatus for transmitting multicast data provided by the present invention, on the one hand, receives the first information sent by the network side device, so that the terminal device can determine not only the second time when the network side device sends the multicast data or the downlink configuration information, but also The time interval between the second moment and the first moment when the terminal device receives the first information can enable the multiple terminal devices to enter the receiving state before the network side device sends the multicast data, so that the multiple terminal devices can be completed at the same time. Receiving multicast data, reducing the possibility of the terminal device missing the multicast data, thereby reducing the number of retransmissions of the multicast data sent by the network side device, and improving the use efficiency of the downlink time-frequency resource;

FIG. 6 shows an apparatus 500 for transmitting multicast data according to an embodiment of the present invention. The apparatus 500 includes:

The first sending module 510 is configured to send the first information to the plurality of terminal devices, where the first information is used to determine the second time, where the second time is the network side device that sends the multicast data or the downlink configuration information. The start time, or the second time is a start time of a time period in which the network side device sends the multicast data or the downlink configuration information, where the downlink configuration information is used for transmitting multicast data, the first time and the first time The time interval between the two times is greater than or equal to the preset time length, where the first time is the time when the plurality of terminal devices receive the first information;

The second sending module 520 is configured to send, by the network side device, the multicast data to the multiple terminal devices from the second moment.

Optionally, there is N time periods between the first time period and the second time period, and the N is greater than or equal to 0 integer.

Optionally, each time period of the multiple time periods is a single cell multicast control channel. The change period of the SC-MCCH or the M change cycles, wherein the M is an integer greater than one.

Optionally, the first information is used to indicate the second moment.

Optionally, the first information is used to indicate that the multiple terminal devices determine the second moment according to the first moment and the preset duration.

Optionally, the preset duration is a duration specified by the system, or the first information is further used to indicate the preset duration.

Optionally, the second sending module 520 is configured to: send, by the network side device, the second SC-MCCH to the multiple terminal devices, where the second SC-MCCH includes the multicast data. a session identifier, where the session identifier is used to uniquely identify the multicast data; and the network side device sends the multicast data to the plurality of terminal devices during a time period in which the second SC-MCCH is sent.

Optionally, the first sending module 510 is specifically configured to: send, by the network side device, the first SC-MCCH to the multiple terminal devices, where the first SC-MCCH carries the first information; or, the network side device sends The plurality of terminal devices send a broadcast channel BCH, and the BCH carries the first information; or the network side device sends a downlink physical control channel PDCCH to the multiple terminal devices, where the PDCCH carries the first information.

Optionally, the first information includes a session identifier of the multicast data, where the session identifier is used to uniquely identify the multicast data.

The apparatus 500 for transmitting multicast data according to the embodiment of the present invention may correspond to a network side device in the method of the embodiment of the present invention, and each unit in the apparatus 500 for transmitting multicast data is a module and the foregoing other operations and/or The functions are respectively implemented in order to implement the corresponding processes performed by the network side device in the

method

200 or 300, and are not cumbersome here for brevity.

Therefore, the apparatus for transmitting multicast data provided by the present invention, by transmitting the first information to the terminal device, enables the terminal device to determine not only the second moment when the network side device sends the multicast data or the downlink configuration information, but also the second moment The time interval between the first moments when the terminal device receives the first information enables the multiple terminal devices to enter the receiving state before the network side device sends the multicast data, so that the multiple terminal devices can completely receive the multicast data at the same time. The possibility of the terminal device missing the multicast data is reduced, thereby reducing the number of retransmissions of the multicast data sent by the network side device, and improving the use efficiency of the downlink time-frequency resource.

FIG. 7 shows an apparatus 600 for transmitting multicast data according to an embodiment of the present invention. The apparatus 600 includes:

Bus 610;

a processor 620 connected to the bus 610;

a memory 630 connected to the bus 610;

a transceiver 640 connected to the bus 610;

The memory 630 is configured to store instructions, and the processor 620 is configured to execute instructions stored in the memory 630 to control the transceiver 640 to receive signals or send signals.

The transceiver 640 is configured to receive the first information sent by the network side device at the first time, where the first information is used to determine the second time, where the second time is the network side device sends the multicast data or the downlink The start time of the configuration information, or the second time is the start time of the time period in which the network side device sends the multicast data or the downlink configuration information, and the downlink configuration information is used for the transmission of the multicast data, the first The time interval between the time and the second time is greater than or equal to the preset time length;

The transceiver 640 is further configured to receive the multicast data according to the first information.

Therefore, the device for transmitting multicast data provided by the device receives the first information sent by the network side device, so that the terminal device can determine not only the second time when the network side device sends the multicast data or the downlink configuration information, but also the second time. The time interval between the moment and the first moment when the terminal device receives the first information enables the plurality of terminal devices to enter the receiving state before the network side device sends the multicast data, so that the plurality of terminal devices can completely receive the group at the same time. The broadcast data reduces the possibility that the terminal device misses the multicast data, thereby reducing the number of retransmissions of the multicast data transmitted by the network side device and improving the use efficiency of the downlink time-frequency resources.

Optionally, the transceiver 640 is further configured to: close the function of receiving the multicast data and the first information during the time interval.

Optionally, the first information is used to indicate the second moment.

The processor 620 is configured to:

Determining, by the first terminal device, the second moment according to the first moment and the preset duration;

The transceiver 640 is specifically configured to:

Optionally, the processor 620 is further configured to:

At the second moment, the first terminal device detects a second SC-MCCH sent by the network side device, where the second SC-MCCH includes a session identifier of the multicast data, where the session identifier is used to uniquely identify the multicast data;

The transceiver 640 is also specifically configured to:

Optionally, the transceiver 640 is specifically configured to:

The processor 620 is also specifically configured to:

The transceiver 640 is also specifically configured to:

It should be understood that, in the embodiment of the present invention, the processor 620 may be a central processing unit ("CPU"), and the processor 620 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 630 can include read only memory and random access memory and provides instructions and data to the processor 620. A portion of the memory 630 may also include a non-volatile random access memory. For example, the memory 630 can also store information of the device type.

The bus 610 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus 610 in the figure.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 620 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 630, and the processor 620 reads the information in the memory 630 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

The device 600 for transmitting multicast data according to the embodiment of the present invention may correspond to the first terminal device in the method of the embodiment of the present invention, and each unit in the device 600 for transmitting the multicast data is a module and the foregoing other operations and/or The functions are respectively implemented in order to implement the corresponding processes performed by the first terminal device in the

method

200 or 300, and are not cumbersome here for brevity.

Therefore, the device for transmitting multicast data provided by the present invention, on the one hand, receives the first information sent by the network side device, so that the terminal device can determine not only the second time when the network side device sends the multicast data or the downlink configuration information, but also The time interval between the second moment and the first moment when the terminal device receives the first information can enable the multiple terminal devices to enter the receiving state before the network side device sends the multicast data, so that the multiple terminal devices can be completed at the same time. Receiving multicast data, reducing the possibility of the terminal device missing the multicast data, thereby reducing the number of retransmissions of the multicast data sent by the network side device, and improving the use efficiency of the downlink time-frequency resource;

FIG. 8 shows an apparatus 700 for transmitting multicast data according to an embodiment of the present invention. The apparatus 700 includes:

Bus 710;

a processor 720 connected to the bus 710;

a memory 730 connected to the bus 710;

a transceiver 750 connected to the bus 710;

The memory 730 is configured to store instructions for executing the instructions stored in the memory 730 to control the transceiver 750 to receive signals or transmit signals.

The transceiver 750 is configured to send, by the network side device, the first information to the multiple terminal devices, where the first information is used to determine the second time, and the second time is that the network side device sends the multicast data or the downlink configuration information. The start time, or the second time is the start time of the time period in which the network side device sends the multicast data or the downlink configuration information, and the downlink configuration information is used for the transmission of the multicast data, the first moment and The time interval between the second moments is greater than or equal to a preset duration, where the first moment is a moment when the plurality of terminal devices receive the first information;

The transceiver 750 is further configured to send, by the network side device, the multicast data to the multiple terminal devices from the second moment.

Optionally, the first information is used to indicate the second moment.

Optionally, the transceiver 750 is configured to: send, by the network side device, the second SC-MCCH to the multiple terminal devices, where the second SC-MCCH includes the session identifier of the multicast data. The session identifier is used to uniquely identify the multicast data; the network side device sends the multicast data to the multiple terminal devices during a time period in which the second SC-MCCH is sent.

Optionally, the transceiver 750 is specifically configured to: send, by the network side device, the first SC-MCCH to the multiple terminal devices, where the first SC-MCCH carries the first information; or, the network side device sends the first information to the multiple The terminal device sends a broadcast channel BCH, and the BCH carries the first information; or the network side device sends a downlink physical control channel PDCCH to the multiple terminal devices, where the PDCCH carries the first information.

Optionally, the first information includes a session identifier of the multicast data, where the session identifier is unique Identifies this multicast data.

It should be understood that, in the embodiment of the present invention, the processor 720 may be a central processing unit ("CPU"), and the processor 720 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 730 can include read only memory and random access memory and provides instructions and data to the processor 520. A portion of the memory 730 may also include a non-volatile random access memory. For example, the memory 730 can also store information of the device type.

The bus 710 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus 710 in the figure.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 720 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in memory 730, and processor 720 reads the information in memory 730 and, in conjunction with its hardware, performs the steps of the above method. To avoid repetition, it will not be described in detail here.

The apparatus 700 for transmitting multicast data according to the embodiment of the present invention may correspond to a network side device in the method of the embodiment of the present invention, and each unit in the apparatus 700 for transmitting multicast data is a module and the foregoing other operations and/or The functions are respectively implemented in order to implement the corresponding processes performed by the network side device in the

method

200 or 300, and are not cumbersome here for brevity.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be The implementation process of the embodiments of the present invention constitutes any limitation.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network side device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or a light. A medium such as a disk that can store program code.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A method for transmitting multicast data, comprising:

Receiving, by the first terminal device, the first information that is sent by the network side device, where the first information is used to determine the second time, and the second time is that the network side device sends the multicast data or the downlink configuration The start time of the information, or the second time is a start time of a time period in which the network side device sends the multicast data or the downlink configuration information, and the downlink configuration information is used to transmit multicast data. The time interval between the first time and the second time is greater than or equal to a preset time length;

The first terminal device receives the multicast data according to the first information.
The method according to claim 1, wherein the first time belongs to a first time period in a plurality of time periods, and the second time belongs to a second time period in the plurality of time periods.
The method according to claim 2, wherein the first time period and the second time period are separated by N time periods, and the N is an integer greater than or equal to 0.
The method according to claim 2 or 3, wherein each of the plurality of time periods is a change period of the single cell multicast control channel SC-MCCH or M of the change period, M is an integer greater than one.
The method according to any one of claims 1 to 4, further comprising:

The first terminal turns off the function of receiving the multicast data and the first information in the time interval.
The method according to any one of claims 1 to 5, wherein the first information is used to indicate the second time.
The method according to any one of claims 1 to 5, wherein the first information is used to instruct the first terminal device to determine the second according to the first moment and the preset duration Moments, and

Receiving, by the first terminal device, the multicast data according to the first information, including:

Determining, by the first terminal device, the second moment according to the first moment and the preset duration;

The first terminal device receives the multicast data according to the second moment.
The method according to claim 7, wherein the preset duration is a system gauge The predetermined duration, or the first information is further used to indicate the preset duration.
The method according to claim 7 or 8, wherein the receiving, by the first terminal device, the multicast data according to the second moment comprises:

The first terminal device detects, at the second moment, a second SC-MCCH sent by the network side device, where the second SC-MCCH includes a session identifier of the multicast data, where the session identifier is used for Uniquely identifying the multicast data;

The first terminal device receives the multicast data in a time period in which the second SC-MCCH is located.
The method according to any one of claims 1 to 9, wherein the receiving, by the first terminal device, the first information sent by the network side device at the first moment comprises:

Receiving, by the first terminal device, the first SC-MCCH sent by the network side device, where the first SC-MCCH carries the first information; or

Receiving, by the first terminal device, the broadcast channel BCH sent by the network side device, where the BCH carries the first information; or

Receiving, by the first terminal device, the downlink physical control channel PDCCH that is sent by the network side device, where the PDCCH carries the first information.
The method according to any one of claims 1 to 10, wherein the first information comprises a session identifier of the multicast data, the session identifier is used to uniquely identify the multicast data, and

Receiving, by the first terminal device, the multicast data according to the first information, including:

Determining, by the first terminal device, downlink configuration information corresponding to the multicast data according to the session identifier;

The first terminal device receives the multicast data according to downlink configuration information corresponding to the multicast data and the second time.
A method for transmitting multicast data, comprising:

The network side device sends the first information to the plurality of terminal devices, where the first information is used to determine the second time, and the second time is the start time of the network side device to send the multicast data or the downlink configuration information. Or the second time is a start time of a time period in which the network side device sends the multicast data or the downlink configuration information, and the downlink configuration information is used to transmit multicast data, where the first time is The time interval between the second moments is greater than or equal to a preset duration, where the first moment is a moment when the plurality of terminal devices receive the first information;

The network side device sends the multicast data to the plurality of terminal devices from the second moment.
The method according to claim 12, wherein the first time belongs to a first time period in a plurality of time periods, and the second time belongs to a second time period in the plurality of time periods.
The method according to claim 13, wherein the first time period and the second time period are separated by N time periods, and the N is greater than or equal to 0 integer.
The method according to claim 13 or 14, wherein each of the plurality of time periods is a change period of the single cell multicast control channel SC-MCCH or M of the change period, M is an integer greater than one.
The method according to any one of claims 12 to 15, wherein the first information is used to indicate the second time.
The method according to any one of claims 12 to 15, wherein the first information is used to instruct the plurality of terminal devices to determine the second according to the first moment and the preset duration time.
The method according to claim 17, wherein the preset duration is a duration specified by the system, or the first information is further used to indicate the preset duration.
The method according to claim 17 or 18, wherein the transmitting, by the network side device, the multicast data to the plurality of terminal devices from the second moment comprises:

The network side device sends a second SC-MCCH to the multiple terminal devices from the second moment, where the second SC-MCCH includes a session identifier of the multicast data, and the session identifier is used for Uniquely identifying the multicast data;

The network side device sends the multicast data to the multiple terminal devices during a time period in which the second SC-MCCH is sent.
The method according to any one of claims 12 to 19, wherein the sending, by the network side device, the first information to the plurality of terminal devices comprises:

Transmitting, by the network side device, the first SC-MCCH to the multiple terminal devices, where the first SC-MCCH carries the first information; or

Transmitting, by the network side device, a broadcast channel BCH to the multiple terminal devices, where the BCH carries the first information; or

The network side device sends a downlink physical control channel PDCCH to the multiple terminal devices, The PDCCH carries the first information.
The method according to any one of claims 12 to 20, wherein the first information comprises a session identifier of the multicast data, and the session identifier is used to uniquely identify the multicast data.
An apparatus for transmitting multicast data, comprising:

a first receiving module, configured to receive, by the first terminal device, first information that is sent by the network side device, where the first information is used to determine a second time, and the second time is sent by the network side device The start time of the multicast data or the downlink configuration information, or the second time is the start time of the time period in which the network side device sends the multicast data or the downlink configuration information, and the downlink configuration information For the transmission of the multicast data, the time interval between the first moment and the second moment is greater than or equal to a preset duration;

The second receiving module is configured to receive, by the first terminal device, the multicast data according to the first information received by the first receiving module.
The apparatus according to claim 22, wherein said first time belongs to a first time period in a plurality of time periods, and said second time time belongs to a second time period in said plurality of time periods.
The apparatus according to claim 23, wherein the first time period and the second time period are separated by N time periods, and the N is an integer greater than or equal to 0.
The apparatus according to claim 23 or 24, wherein each of the plurality of time periods is a change period of the single cell multicast control channel SC-MCCH or M of the change period, M is an integer greater than one.
The device according to any one of claims 22 to 25, wherein the first receiving module is further configured to:

Closing the function of receiving the first information during the time interval;

The second receiving module is further configured to:

The function of receiving the multicast data is turned off during the time interval.
The apparatus according to any one of claims 22 to 26, wherein the first information is used to indicate the second time.
The device according to any one of claims 22 to 26, wherein the first information is used to indicate that the first terminal device determines according to the first time and the preset duration The second moment, and

The device also includes:

a determining module, configured to determine, by the first terminal device, the second moment according to the first moment and the preset duration; and

The second receiving module is specifically configured to:

The first terminal device receives the multicast data according to the second moment.
The device according to claim 28, wherein the preset duration is a duration specified by the system, or the first information is further used to indicate the preset duration.
The device according to claim 28 or 29, wherein the device further comprises:

a detecting module, configured to: at the second moment, the first terminal device detects a second SC-MCCH sent by the network side device, where the second SC-MCCH includes a session identifier of the multicast data, where The session identifier is used to uniquely identify the multicast data;

The second receiving module is specifically configured to:

The first terminal device receives the multicast data in a time period in which the second SC-MCCH is located.
The device according to any one of claims 22 to 30, wherein the first receiving module is specifically configured to:

Receiving, by the first terminal device, the first SC-MCCH sent by the network side device, where the first SC-MCCH carries the first information; or

Receiving, by the first terminal device, the broadcast channel BCH sent by the network side device, where the BCH carries the first information; or

Receiving, by the first terminal device, the downlink physical control channel PDCCH that is sent by the network side device, where the PDCCH carries the first information.
The apparatus according to any one of claims 22 to 31, wherein the first information comprises a session identifier of the multicast data, the session identifier is used to uniquely identify the multicast data, and

The determining module is further configured to: determine, by the first terminal device, downlink configuration information corresponding to the multicast data according to the session identifier;

The second receiving module is specifically configured to:

The first terminal device receives the multicast data according to downlink configuration information corresponding to the multicast data and the second time.
An apparatus for transmitting multicast data, comprising:

a first sending module, configured to send, by the network side device, the first information to the multiple terminal devices, where the first information is used to determine the second time, and the second time is that the network side device sends the multicast data or The start time of the downlink configuration information, or the second time is a start time of a time period in which the network side device sends the multicast data or the downlink configuration information, and the downlink configuration information is used for multicast data. The time interval between the first time and the second time is greater than or equal to a preset time length, where the first time is a time when the plurality of terminal devices receive the first information;

And a second sending module, configured to send, by the network side device, the multicast data to the multiple terminal devices from the second moment.
The apparatus according to claim 33, wherein said first time belongs to a first time period in a plurality of time periods, and said second time time belongs to a second time period in said plurality of time periods.
The apparatus according to claim 34, wherein the first time period and the second time period are separated by N time periods, and the N is greater than or equal to 0 integer.
The apparatus according to claim 34 or 35, wherein each of the plurality of time periods is a change period of the single cell multicast control channel SC-MCCH or M of the change period, M is an integer greater than one.
The apparatus according to any one of claims 33 to 36, wherein the first information is used to indicate the second time.
The device according to any one of claims 33 to 36, wherein the first information is used to instruct the plurality of terminal devices to determine the second according to the first moment and the preset duration time.
The device according to claim 38, wherein the preset duration is a duration specified by the system, or the first information is further used to indicate the preset duration.
The device according to claim 38 or 39, wherein the second sending module is specifically configured to:

The network side device sends a second SC-MCCH to the multiple terminal devices from the second moment, where the second SC-MCCH includes a session identifier of the multicast data, and the session identifier is used for Uniquely identifying the multicast data;

The network side device sends the multicast data to the multiple terminal devices during a time period in which the second SC-MCCH is sent.
The device according to any one of claims 33 to 40, wherein the first sending module is specifically configured to:

Transmitting, by the network side device, the first SC-MCCH to the multiple terminal devices, where the first SC-MCCH carries the first information; or

Transmitting, by the network side device, a broadcast channel BCH to the multiple terminal devices, where the BCH carries the first information; or

The network side device sends a downlink physical control channel PDCCH to the multiple terminal devices, where the PDCCH carries the first information.
The apparatus according to any one of claims 33 to 41, wherein the first information comprises a session identifier of the multicast data, and the session identifier is used to uniquely identify the multicast data.