CN101742427A - Method, device and system for sending, receiving and transmitting service data - Google Patents

Abstract

The embodiment of the invention provides a method, a device and a system for sending, receiving and transmitting business data, belonging to the field of communication. The method for sending the business data comprises the steps of sending the business data in the determined transmission time interval and notifying a terminal of the transmission time interval for sending the follow-up business data in the current scheduling cycle. The method for receiving the business data comprises the steps of receiving the business data and receiving the follow-up business data when knowing the follow-up business data sent by a base station in the current scheduling cycle. The embodiment of the invention further provides the device for sending and receiving the business data and the system for transmitting the business data. In the embodiment of the invention, the base station can determine the transmission time interval for sending the business data in the scheduling cycle, thereby reducing the data transmission time delay and avoiding the data loss. Furthermore, the terminal can timely know information of the transmission time interface for receiving the business data, thereby shortening the monitoring time and saving the energy consumption of the terminal.

Description

Method, device and system for sending, receiving and transmitting service data

technical field

The present invention relates to the communication field, in particular to a method, device and system for sending, receiving and transmitting service data.

Background technique

Multicast Multicast Service (MBMS, Multimedia Broadcast Multicast Service) is one of the important contents of 3GPP service development. MBMS mainly means that the network side sends the same multimedia data to multiple receivers in the network at the same time. Compared with single-user transmission, MBMS greatly saves air interface resources.

In the prior art, there are two transmission modes of MBMS data: one is a multi-cell mode; the other is a single-cell mode. When transmitting MBMS data in single-cell mode, the evolved base station (eNB, evovledNodeB) transmits MBMS data in a semi-static scheduling manner, and schedules MBMS data once in each semi-static scheduling period, that is, the eNB transmits MBMS data through a physical downlink shared channel (PDSCH , Physical DownlinkShare CHannel) to transmit MBMS data, and indicate that the MBMS data comes from a certain MBMS type.

In the course of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

The eNB adopts semi-static scheduling to transmit MBMS data, so the eNB can only use a fixed transmission time interval (TTI, Transmission Time Internal) in the semi-static scheduling cycle to send MBMS data once, which cannot meet the requirements of MBMS data transmission with a faster instantaneous rate. , which will increase the data delay and lead to data loss.

Contents of the invention

Embodiments of the present invention provide methods, devices and systems for sending, receiving and transmitting service data, so as to solve the problem of data loss caused by the eNB adopting the existing semi-persistent scheduling method to transmit MBMS data.

An embodiment of the present invention provides a method for sending service data, including:

Send business data within a certain transmission time interval;

Informing the terminal of the transmission time interval used to send the subsequent data of the service within the current scheduling period.

An embodiment of the present invention provides a method for receiving service data, including:

Receive business data;

When it is known that the base station sends the subsequent data of the service in the current scheduling period, it receives the subsequent data of the service.

An embodiment of the present invention provides a base station, including:

A sending module, configured to send service data within a determined transmission time interval;

A notification module, configured to notify the terminal of a transmission time interval for sending subsequent data of the service within the current scheduling period.

An embodiment of the present invention provides a terminal, including:

a first receiving module, configured to receive service data;

A triggering module, configured to trigger the second receiving module when knowing the transmission time interval for the base station to send the subsequent data of the service in the current scheduling period;

The second receiving module is configured to receive the trigger of the trigger module and receive the subsequent data of the service.

An embodiment of the present invention provides a system for transmitting business data, including:

The base station is configured to send service data within a determined transmission time interval, and notify the terminal of the transmission time interval used to send subsequent data of the service within the current scheduling period;

The terminal is configured to receive service data, and receive the follow-up data of the service when knowing the transmission time interval for the base station to send the follow-up data of the service within the current scheduling period.

In the embodiment of the present invention, the base station can determine the transmission time interval for sending service data within a scheduling period, so that sending service data is more flexible, thereby reducing data transmission delay and avoiding data loss. In addition, the terminal can know the transmission time interval information of receiving service data in a timely manner, which shortens the terminal monitoring time and thus saves energy consumption of the terminal.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the method flowchart of embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of instruction information in Embodiment 2 of the present invention;

FIG. 3 is a schematic diagram of an instruction message in Embodiment 3 of the present invention;

Fig. 4 is the method flowchart of embodiment 4 of the present invention;

FIG. 5 is a schematic structural diagram of a base station according to Embodiment 7 of the present invention;

FIG. 6 is a schematic diagram of a terminal structure according to Embodiment 8 of the present invention;

FIG. 7 is a schematic diagram of the system structure of Embodiment 9 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Figure 1, Embodiment 1 of the present invention provides a method for sending service data, including:

Step 101: sending service data within a determined transmission time interval;

Step 102: Notifying the terminal of the transmission time interval for sending subsequent data of the service within the current scheduling period.

In the embodiment of the present invention, the base station can determine the transmission time interval for sending service data within a scheduling period, so that sending service data is more flexible, thereby reducing data transmission delay and avoiding data loss.

Taking the MBMS service as an example, the above-mentioned embodiment 1 will be described in detail through embodiments 2 to 3 of the present invention.

This embodiment 2 may include the following steps:

Step 201: the eNB determines the scheduling period; this step is optional.

Specifically, after the eNB determines to use the single-cell mode to transmit a certain MBMS service data, it can determine the scheduling period for the MBMS service data, for example, automatically configure the scheduling period according to the UE's QoS and other information, or manually configure the scheduling period according to actual needs. Further, the eNB may notify the UE of the determined length and starting position of the scheduling period through a multipoint control channel (MCCH, Multipoint Control Channel).

Step 202: The eNB determines TTIs for sending MBMS data in the scheduling period, such as the 2nd TTI and the 6th TTI.

It should be noted that, in this step, the eNB may use one or more TTIs in one scheduling period for transmitting MBMS data, or may not transmit MBMS data in this scheduling period.

Step 203: The eNB sends the MBMS service data in the second TTI, and notifies the terminal that there is a TTI for sending subsequent data of the MBMS service in the current scheduling period.

In this step, the eNB may send indication information in the second TTI, and the indication information indicates that there is a transmission time interval for sending subsequent data of the MBMS service in the current scheduling period. Specifically, the indication information may be carried in the physical downlink control channel message sent to the terminal or in the media access control header of the multicast multicast protocol data unit, for example, the indication information may occupy the extension of the above message or the media access control header bits or extension fields. Taking the nth scheduling period shown in Figure 2 as an example, a scheduling period includes 8 TTIs, Extend1 is the indication information carried in the physical downlink control channel message, then the eNB sends MBMS service data in the second TTI, and The Extend1 sent in the second TTI is set to 1, which is used to indicate that there is still a TTI for sending the subsequent data of the MBMS service in the scheduling period.

Step 204: The eNB sends the subsequent data of the MBMS service in the sixth TTI, and notifies the terminal that there is no TTI for sending the subsequent data of the MBMS service in the current scheduling period.

Specifically, taking the nth scheduling period shown in Figure 2 as an example, the eNB sends the subsequent data of the MBMS service in the sixth TTI, and sets the Extend1 sent in the sixth TTI to 0 to indicate There is no TTI for sending subsequent data of the MBMS service within the scheduling period.

In this embodiment, the indication information Extend1 may only occupy 1 bit, which occupies less resources.

Embodiment 3 of the present invention is similar to Embodiment 2 above, except that the indication information in this embodiment is used to indicate the position of the TTI for sending the subsequent data of the MBMS service after the determined TTI.

Specifically, steps 301-302 in this embodiment are similar to steps 201-202 in embodiment 2. It is assumed that the eNB determines to send the MBMS service in the second and sixth TTIs in the nth scheduling period, without Let me repeat. In steps 303-304 in this embodiment, the eNB sends the MBMS service data in the second TTI, and notifies the terminal that the TTI used to send the subsequent data of the MBMS service is the sixth TTI in the current scheduling period; Subsequent data of the MBMS service is sent in the sixth TTI.

In this embodiment, the indication information Extend2 may be a serial number value that can directly indicate the position of the TTI, and the range that the value can represent is related to the number of TTIs in the scheduling period. For example, if the scheduling period contains 20 TTIs, the indication range of the indication information includes 0-19. For example, 100 indicates that the serial number is 5, that is, the sixth TTI, and for example, 000 indicates that the serial number is 0, that is, the first TTI. Taking the nth scheduling cycle shown in Figure 3 as an example, a scheduling cycle includes 8 TTIs, and the indication information Extend2 carried in the physical downlink control channel message occupies 3 bits, and the eNB will set the Extend2 sent in the second TTI is 101, used to indicate that the TTI for sending the subsequent data of the MBMS service is the sixth TTI of the current scheduling cycle; the eNB will also set the Extend2 sent in the sixth TTI to null or the physical downlink sent in the TTI Control channel messages do not carry indication information.

In this embodiment, the value of Extend2 and the TTI position may form an indication list. For example, in the table, Extend2 is 1, corresponding to the fourth TTI in the current scheduling period; Extend2 is 2, corresponding to the sixth TTI in the current scheduling period. The above instruction list can be stored separately by eNB and UE, or can be stored by other network entities and provide queries for eNB and UE; the above instruction list can include the correspondence between all TTI positions and Extend2 values in a scheduling period, or only Contains the corresponding relationship between the TTI position agreed by the eNB and the UE that may be used to send MBMS service data and the value of Extend2, so as to reduce the bits occupied by the indication information and avoid unnecessary waste of resources.

In this embodiment, the value of Extend2 and the TTI position may also constitute a position interval list. For example, in this table, Extend2 is 1, and the corresponding location interval parameter is 4, indicating that the TTI sequence number difference between the TTI for sending the subsequent data of the service and the current TTI is 4. Assuming that the current TTI is the second TTI, the TTI for sending the subsequent data of the service For the 6th TTI.

Further, the value of Extend2 in this step may also include indicating that there is no TTI for sending subsequent data, for example, if Extend2 is null or an agreed value, it corresponds to the fact that there is no TTI for sending subsequent data in the current scheduling period. TTI of the data.

In this embodiment, the eNB can accurately indicate the TTI position for sending the subsequent data of the MBMS service through the indication information, so as to facilitate the UE to determine when to read the data, thereby saving energy consumption of the terminal.

In the above embodiment of the method for sending service data, the eNB schedules and transmits service data through the indication information, and can send multiple MBMS data within one scheduling period, which solves the problem that the eNB can only transmit within one scheduling period under the single-cell transmission mode in the prior art. The problem of scheduling a service data makes the transmission of the service data more flexible, and then makes the system performance meet the bursty requirement of the transmission of the MBMS service data.

As shown in Figure 4, Embodiment 4 of the present invention provides a method for receiving service data, which may include the following steps:

Step 401: receiving service data;

Step 402: Receive the subsequent data of the service when it is known that the base station sends the subsequent data of the service in the current scheduling period.

In the embodiment of the present invention, the UE can know the TTI information of the received service data in time, which shortens the UE monitoring time and further saves the energy consumption of the terminal.

The above-mentioned embodiment 4 will be described in detail below through embodiments 5 to 6 of the present invention.

Assuming that the eNB sends MBMS service data and indication information in the 2nd TTI and 6th TTI in a certain scheduling period as exemplified in Embodiment 2, Embodiment 5 of the present invention may include the following steps:

Step 501: The UE receives the length and starting position of the scheduling cycle sent by the eNB through a Multipoint Control Channel (MCCH, Multipoint ControlChannel). This step is optional.

Step 502: UE receives MBMS service data in the second TTI in the current scheduling period.

Step 503: The UE learns that the base station sends subsequent data of the MBMS service in the current scheduling period by reading the indication information.

Specifically, the UE may receive the physical downlink control channel message of the second TTI in the current scheduling period or the media access control header of the multicast protocol data unit, and read the indication information Extend1 therein, assuming that the indication information is 1, the UE knows that the base station will send subsequent data of the MBMS service in the current scheduling period.

Step 504: UE reads the subsequent data of the MBMS service.

Specifically, after knowing the subsequent data of the MBMS service sent by the base station in the current scheduling period, the UE can monitor the TTI after the second TTI until the sixth TTI in the current scheduling period receives the MBMS service data. follow-up data.

Step 505: The UE learns that the base station does not send subsequent data of the MBMS service in the current scheduling period by reading the indication information, and the UE may not monitor subsequent TTIs in the current scheduling period.

Specifically, the UE can read the indication information Extend1 contained in the physical downlink control channel message of the sixth TTI. Assuming that the indication information is 0, the UE knows that there is no subsequent data for sending the MBMS service in the current scheduling period TTI, the UE can stop monitoring until the next scheduling period.

In this embodiment, when the UE knows that there is no TTI for sending the subsequent data of the MBMS service in the current scheduling period, the UE may stop monitoring the subsequent TTIs in the current scheduling period, thereby shortening the UE monitoring time, thereby saving terminal energy. consumption.

Embodiment 6 of the present invention is similar to Embodiment 5, except that the UE receives the subsequent service data according to the learned TTI position of the base station sending the subsequent service data in the current scheduling period. In this embodiment, it is assumed that the eNB transmits MBMS service data and indication information in the second TTI and the sixth TTI in a certain scheduling period as exemplified in Embodiment 3.

Specifically, steps 601-602 of this embodiment are similar to steps 501-502 of Embodiment 5, and will not be repeated here. Steps 603-605 of this embodiment may be specifically as follows:

Step 603: The UE learns the TTI position of the base station sending the subsequent data of the MBMS service in the current scheduling period by reading the indication information.

Specifically, the UE may receive the physical downlink control channel message of the second TTI in the current scheduling period or the media access control header of the multicast protocol data unit, and read the indication information Extend2 therein. The UE can interpret the Extend2 according to the indication mode of the indication information agreed with the eNB. For example, Extend2 directly indicates the serial number value of the TTI position. Assuming that Extend2 is 11, the UE knows that the base station has sent the subsequent data of the MBMS service in the fourth TTI in the current scheduling period. For another example, the UE may obtain the TTI position from an indication list stored by itself or that can be queried according to the value of Extend2. Assume that the content of the instruction list includes that Extend2 is 1, corresponding to the fourth TTI in the current scheduling period; Extend2 is 2, corresponding to the sixth TTI in the current scheduling period. Assuming that the UE receives that the Extend2 is 2, the UE knows through the list that there is subsequent data of the MBMS service in the 6th TTI in the current scheduling period. For another example, the UE may obtain the location interval parameter for calculating the TTI location from the location interval list stored by itself or that can be queried according to the value of Extend2. Assume that the content of the above location interval list includes the value of Extend2 is 1, and the corresponding location interval parameter is 3; the value of Extend2 is 2, and the corresponding location interval parameter is 4; assuming that the Extend2 value received by the UE is 2, the UE knows The TTI for sending subsequent service data in the current scheduling period is the sixth TTI.

Step 604: UE reads the subsequent data of the MBMS service.

Specifically, the UE can choose not to monitor or partially monitor the MBMS service in the 3rd to 5th TTI, and the UE monitors and receives the subsequent data of the MBMS service in the 6th TTI, thereby reducing the time for the UE to monitor and reducing energy consumption. consumption.

Step 605: The UE learns that the base station does not send subsequent data of the MBMS service in the current scheduling period by reading the indication information, and the UE may not monitor subsequent TTIs in the current scheduling period.

Specifically, the physical downlink control channel message received by the UE in the sixth TTI or the media access control header of the multicast multicast protocol data unit does not contain indication information, or the indication information is null, so that it knows that there are no indication information in the current scheduling period There is a TTI for sending subsequent data, and the UE may not monitor the subsequent TTI in the current period.

In this embodiment, the indication list and/or location interval list stored by the UE is the same as the corresponding list stored by the eNB, which may be jointly determined by the eNB and the UE through negotiation or protocol regulations, or provided to the UE by the eNB; the above list may also be Queries are stored and provided to UEs and/or eNBs by other network entities. In addition, if the TTI position determined by the UE according to the above list is outside the current scheduling period, the UE may regard the indication information as invalid and not operate according to the indication information.

In the embodiment of the present invention, the UE obtains the location for reading MBMS service data according to the indication information, thereby saving energy consumption.

It should be noted that the methods for eNB setting indication information in Embodiment 2 and Embodiment 3 above can be combined, for example, determine the meaning of part of the indication information through the method provided in Embodiment 2, and determine the meaning of a part of the indication information through the method provided in Embodiment 2. As for the meaning of another part of the indication information, the eNB can also use the method of eNB setting the indication information in the above two embodiments at the same time, for example, notify the UE of the preferred way to interpret the indication information through an extension field or a message. Similarly, the methods for the UE to read the indication information in the above-mentioned Embodiment 5 and Embodiment 6 may also be combined or used at the same time, which will not be repeated here. In addition, the method in which the UE determines the TTI position according to the read indication information and then receives the subsequent data of the service can be combined with the method in the prior art that the UE receives MBMS service data at the TTI position agreed with the eNB, and the UE can choose when to read the indication information and receive MBMS service data according to the instruction information, and when to receive MBMS service data directly at the agreed TTI position.

It should be noted that in the embodiment of the present invention, both the eNB determining the scheduling period and the UE receiving information related to the scheduling period are optional steps. Specifically, the eNB may determine the scheduling period and notify the UE when establishing a connection with the UE or starting transmission. Whether the scheduling period changes is not necessarily related to whether and how the eNB transmits service data with the UE in the embodiments of the present invention. In addition, in the embodiment of the present invention, eNB can determine the TTI used for sending MBMS data in a scheduling period before sending service data in a certain scheduling period, and apply the determined result to a certain period of time, for example, within n scheduling periods The MBMS data is sent using the TTI determined above, wherein the smaller the value of n, the better the application of the embodiments of the present invention can meet the burstiness requirement of service data transmission. For example, preferably, when n is 1, the eNB performs the step of determining the TTI for sending MBMS data in each scheduling period before sending service data in each scheduling period, so that the eNB can transmit service data flexibly.

In the foregoing embodiment, the terminal can know the TTI information of received service data in a timely manner, which shortens the monitoring time of the terminal, thereby saving energy consumption of the terminal.

As shown in Figure 5, a base station provided by Embodiment 7 of the present invention includes:

A sending module 701, configured to send service data within a determined transmission time interval;

The notification module 702 is configured to notify the terminal of the transmission time interval for sending subsequent data of the service within the current scheduling period.

Further, the notification module 701 is specifically configured to notify the terminal of the transmission time interval for sending the subsequent data of the service in the current scheduling period by sending indication information; the indication information is used to indicate whether there is a transmission time interval for sending the service in the current scheduling period. The transmission time interval of the subsequent data, and/or, indicating the position of the transmission time interval for sending the subsequent data of the service within the current scheduling cycle, and/or, indicating the transmission time interval of the subsequent data of the service and the determined transmission The ordinal difference of the time interval.

In the embodiment of the present invention, the base station can determine the transmission time interval for sending service data within a scheduling period, so that sending service data is more flexible, thereby reducing data transmission delay and avoiding data loss.

As shown in FIG. 6, a terminal provided by provision 8 of the embodiment of the present invention includes:

A first receiving module 801, configured to receive business data;

The triggering module 802 is configured to trigger the second receiving module 803 when knowing the transmission time interval for the base station to send the subsequent data of the service within the current scheduling period;

The second receiving module 803 is configured to receive the trigger of the trigger module 802 and receive subsequent data of the service.

In the embodiment of the present invention, the terminal can know the TTI information of the received service data in time, which shortens the monitoring time of the terminal, thereby saving energy consumption of the terminal.

As shown in Figure 7, Embodiment 9 of the present invention provides a system for transmitting service data, including:

The base station 901 is configured to send service data within a determined transmission time interval, and notify the terminal 702 of the transmission time interval for sending subsequent data of the service within the current scheduling period;

The terminal 902 is configured to receive service data, and receive the follow-up data of the service when knowing the transmission time interval for the base station 901 to send the follow-up data of the service in the current scheduling period.

In the embodiment of the present invention, the base station can determine the transmission time interval for sending service data within a scheduling period, so that sending service data is more flexible, thereby reducing data transmission delay and avoiding data loss. At the same time, the terminal can know the TTI information of receiving service data in time, which shortens the terminal monitoring time, thereby saving the energy consumption of the terminal.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium is A computer's floppy disk, hard disk, or CD, etc.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (12)

1. A method for sending service data, characterized in that, comprising: Send business data within a certain transmission time interval; Informing the terminal of the transmission time interval used to send the subsequent data of the service within the current scheduling period. 2. The method for sending service data according to claim 1, characterized in that, the transmission time interval for sending the subsequent data of the service in the current scheduling period is notified to the terminal by sending indication information; The indication information is used to indicate whether there is a transmission time interval for sending the subsequent data of the service in the current scheduling period, and/or indicate the position of the transmission time interval for sending the subsequent data of the service in the current scheduling period , and/or, indicating the sequence number difference between the transmission time interval for sending the subsequent data of the service and the determined transmission time interval. 3. The method for sending service data according to claim 2, wherein if the indication information is used to indicate the position of the transmission time interval for sending the subsequent data of the service within the current scheduling period, and/or, Indicate the difference between the sequence number between the transmission time interval for sending the subsequent data of the service and the determined transmission time interval, and before sending the indication information, it also includes: saving or querying a list; the list includes the correspondence between the indication information and the position of the transmission time interval in the current scheduling period, or the correspondence between the indication information and the difference between the serial number of the transmission time interval. 4. The method for sending service data according to any one of claims 1 to 3, further comprising: When the indication information indicates that there is a transmission time interval for sending subsequent data of the service within the current scheduling period, sending the subsequent data of the service; or, When the indication information indicates the position of the transmission time interval for sending the subsequent data of the service within the current scheduling period, the subsequent data of the service is sent within the transmission time interval of the position. 5. The method for sending service data according to claim 2 or 3, wherein the sending instruction information is specifically: sending a physical downlink control channel message including the indication information; or, sending a multicast multicast protocol data unit including the indication information, where the indication information is located in a media access control header of the multicast multicast protocol data unit. 6. A method for receiving service data, comprising: Receive business data; When it is known that the base station sends the subsequent data of the service in the current scheduling period, it receives the subsequent data of the service. 7. The method for receiving service data according to claim 6, characterized in that the subsequent data of the learned base station sending the service within the current scheduling period is specifically: Acquiring indication information, the indication information indicating that there is a transmission time interval for sending the subsequent data of the service within the current scheduling period, and/or indicating that the transmission time interval for the base station to send the subsequent data of the service is within the current scheduling period and/or, indicating the sequence number difference between the transmission time interval for sending the subsequent data of the service by the base station and the transmission time interval for receiving the service data. 8. The method for receiving service data according to claim 7, wherein the receiving the subsequent data of the service specifically comprises: receiving the service data within a transmission time interval determined according to the position or the sequence number difference Subsequent data of the business described above. 9. The method for receiving service data according to claim 7 or 8, characterized in that, the acquisition instruction information is specifically: Obtain the indication information contained in the physical downlink control channel message or the multicast multicast protocol data unit. 10. A base station, characterized in that, comprising: A sending module, configured to send service data within a determined transmission time interval; A notification module, configured to notify the terminal of a transmission time interval for sending subsequent data of the service within the current scheduling period. 11. A terminal, characterized in that, comprising: a first receiving module, configured to receive service data; A triggering module, configured to trigger the second receiving module when knowing the transmission time interval for the base station to send the subsequent data of the service in the current scheduling period; The second receiving module is configured to receive the trigger of the trigger module and receive the subsequent data of the service. 12. A system for transmitting business data, comprising: The base station is configured to send service data within a determined transmission time interval, and notify the terminal of the transmission time interval used to send subsequent data of the service within the current scheduling period; The terminal is configured to receive service data, and receive the follow-up data of the service when knowing the transmission time interval for the base station to send the follow-up data of the service in the current scheduling period.

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