TW202429855A - Method of discontinuous reception for multicast and broadcast service and device thereof - Google Patents

Abstract

A method, a user equipment (UE), and a base station (BS) of discontinuous reception (DRX) for multicast and broadcast service (MBS). The method adapted to the BS including: transmitting first control information for a second DRX cycle during a first DRX cycle, wherein the first control information includes a first serial number of a first packet corresponding to the MBS.

Description

Method and device for discontinuous reception of multicast broadcast services

The present invention relates to a wireless communication technology, and in particular to a method, a base station and a user equipment (UE) for discontinuous reception (DRX) of multicast and broadcast service (MBS).

Under the long term evolution (LTE) architecture, a user equipment can receive multicast broadcast services provided by a base station during the DRX cycle for multicast broadcast services. However, the multicast broadcast service packets transmitted by the base station during the DRX cycle are not necessarily the packets required by the user equipment. If the user equipment is configured to continuously perform discontinuous reception during the DRX cycle, unnecessary power consumption of the user equipment will be consumed. If the user equipment is configured to enter a sleep state during the DRX cycle, the user equipment may miss the reception of important data.

The present invention provides a method, a base station and a user equipment for discontinuous reception of a multicast broadcast service, which can reduce the power consumption of the user equipment supporting unicast service and multicast broadcast service and avoid the user equipment from receiving data errors.

A method for discontinuous reception of a multicast broadcast service of the present invention is applicable to a base station, comprising: transmitting first control information for a second discontinuous reception period during a first discontinuous reception period, wherein the first control information comprises a first sequence number corresponding to a first packet of the multicast broadcast service.

In an embodiment of the present invention, the method further comprises: transmitting a second packet corresponding to the multicast broadcast service during a second discontinuous reception period, wherein the second packet comprises a second sequence number, and the second sequence number comprises one of the first sequence number and a previous sequence number of the first sequence number.

In one embodiment of the present invention, the second discontinuous reception period for the multicast broadcast service is between the first discontinuous reception period for the unicast service and the third discontinuous reception period for the unicast service, and the second discontinuous reception period does not overlap with the first discontinuous reception period and the third discontinuous reception period in the time domain.

In one embodiment of the present invention, the method further comprises: transmitting second control information for a third discontinuous reception cycle during the second discontinuous reception cycle, wherein the third discontinuous reception cycle is used for unicast service, wherein the second control information indicates whether the user equipment performs discontinuous reception during the third discontinuous reception cycle.

In an embodiment of the present invention, the method further comprises: providing at least one of a unicast service and a multicast broadcast service to the user equipment during a first discontinuous reception period; and providing the multicast broadcast service to the user equipment during a second discontinuous reception period.

A method for discontinuous reception of a multicast broadcast service of the present invention is applicable to a user equipment, comprising: receiving first control information for a second discontinuous reception period during a first discontinuous reception period, wherein the first control information comprises a first sequence number corresponding to a first packet of the multicast broadcast service.

In an embodiment of the present invention, the method further comprises: receiving a second packet before the second discontinuous receiving cycle, wherein the second packet comprises a second sequence number; and determining whether the first sequence number matches the second sequence number.

In one embodiment of the present invention, the step of determining whether the first sequence number matches the second sequence number includes: in response to the first sequence number including the second sequence number and one of the previous sequence numbers of the second sequence number, determining that the first sequence number matches the second sequence number; and in response to the first sequence number including the subsequent sequence number of the second sequence number, determining that the first sequence number does not match the second sequence number.

In an embodiment of the present invention, the method further comprises: in response to the first sequence number matching the second sequence number, omitting the discontinuous reception of the multicast broadcast service during the second discontinuous reception period.

In one embodiment of the present invention, the method further comprises: in response to the first sequence number not matching the second sequence number, performing discontinuous reception of the multicast broadcast service during a second discontinuous reception period.

In one embodiment of the present invention, the method further comprises: in response to receiving a data packet for a unicast service during the first discontinuous reception period, re-starting an inactivity timer; and performing sleep after the inactivity timer expires.

A base station of the present invention comprises a processor and a transceiver. The processor is coupled to the transceiver, wherein the processor is configured to execute: during a first discontinuous reception period, the transceiver transmits first control information for a second discontinuous reception period, wherein the first control information comprises a first sequence number corresponding to a first packet of a multicast broadcast service.

A user equipment of the present invention comprises a processor and a transceiver. The processor is coupled to the transceiver, wherein the processor is configured to execute: receiving first control information for a second discontinuous receiving cycle during a first discontinuous receiving cycle, wherein the first control information comprises a first sequence number corresponding to a first packet of a multicast broadcast service.

Based on the above, the mechanism disclosed in the present invention for waking up the user equipment to perform discontinuous reception can be applied to a communication system supporting two services, namely, multicast broadcast service and unicast service. The present invention can meet the service requirements of the user equipment and can effectively reduce the power consumption of the user equipment.

In order to make the content of the present invention more clearly understood, the following embodiments are specifically cited as examples by which the present invention can be truly implemented. In addition, wherever possible, elements/components/steps with the same reference numerals in the drawings and embodiments represent the same or similar components.

The user equipment of the present invention supports the discontinuous reception mechanism of unicast service and multicast broadcast service at the same time. The base station can provide the user equipment with unicast service and/or multicast broadcast service in the DRX cycle used for unicast service, and can provide the user equipment with multicast broadcast service in the DRX cycle used for multicast broadcast service.

Fig. 1 is a schematic diagram of a DRX cycle according to an embodiment of the present invention. In this embodiment, DRX cycle C1(M) and DRX cycle C3(M) are used for multicast broadcast services, and DRX cycle C2(U) and DRX cycle C4(U) are used for unicast services.

The DRX cycle for the multicast broadcast service may be between two DRX cycles for the unicast service, wherein the DRX cycle for the multicast broadcast service may be adjacent to or not adjacent to any one of the two DRX cycles for the unicast service, and each DRX cycle does not overlap each other in the time domain. Taking the DRX cycle C3(M) for the multicast broadcast service as an example, the DRX cycle C3(M) may be between the DRX cycle C2(U) and the DRX cycle C4(U) for the unicast service. In FIG1 , DRX cycle C3(M) is adjacent to DRX cycle C2(U) and DRX cycle C4(U), but DRX cycle C3(M) may not be adjacent to DRX cycle C2(U) or DRX cycle C4(U). If DRX cycle C3(M) is not adjacent to DRX cycle C2(U), it means that one or more DRX cycles for unicast services are configured between DRX cycle C3(M) and DRX cycle C2(U). If DRX cycle C3(M) is not adjacent to DRX cycle C4(U), it means that one or more DRX cycles for multicast broadcast services are configured between DRX cycle C3(M) and DRX cycle C4(U).

On the other hand, the DRX cycle for unicast service may be between two DRX cycles for multicast broadcast service, wherein the DRX cycle for unicast service may be adjacent to or not adjacent to any one of the two DRX cycles for multicast broadcast service, and each DRX cycle does not overlap each other in the time domain. Taking the DRX cycle C2(U) for unicast service as an example, the DRX cycle C2(U) may be between the DRX cycle C1(M) and the DRX cycle C3(M) for multicast broadcast service. In FIG1 , DRX cycle C2(U) is adjacent to DRX cycle C1(M) and DRX cycle C3(M), but DRX cycle C2(U) may not be adjacent to DRX cycle C1(M) or DRX cycle C3(M). If DRX cycle C2(U) is not adjacent to DRX cycle C1(M), it means that one or more DRX cycles for multicast broadcast services are configured between DRX cycle C1(M) and DRX cycle C2(U). If DRX cycle C2(U) is not adjacent to DRX cycle C3(M), it means that one or more DRX cycles for unicast services are configured between DRX cycle C2(U) and DRX cycle C3(M).

The base station may transmit control information to the user equipment during the DRX cycle for the multicast broadcast service, wherein the control information is, for example, downlink control information (DCI with CRC scrambled by PS-RNTI, DCP) with individual power saving radio network temporary identifier (PS-RNTI). The individual DCP is used to instruct the user equipment to activate or deactivate discontinuous reception (i.e., perform or not perform discontinuous reception) in the next DRX cycle for unicast service after the end of the current DRX cycle (which may be adjacent to or not adjacent to the current DRX cycle). Taking DRX cycle C1(M) as an example, assume that individual DCP 11 instructs the user equipment to start discontinuous reception during the next DRX cycle for unicast service after the end of DRX cycle C1(M). Since DRX cycle C2(U) is the next DRX cycle for unicast service after the end of DRX cycle C1(M), the user equipment can start discontinuous reception during DRX cycle C2(U) (e.g., at the beginning of DRX cycle C2(U)) according to individual DCP 11. Taking DRX cycle C3(M) as an example, assume that individual DCP 11 instructs the user equipment to turn off discontinuous reception during the next DRX cycle for unicast service after the end of DRX cycle C3(M). Since DRX cycle C4(U) is the next DRX cycle for unicast service after the end of DRX cycle C3(M), the user equipment can turn off discontinuous reception during DRX cycle C4(U) according to individual DCP 11.

After the user equipment activates discontinuous reception during the DRX cycle C2(U), the user equipment may activate an inactivity timer. While the inactivity timer is running, the user equipment may receive data packets for unicast services or data packets for multicast broadcast services from the base station. The user equipment may restart the inactivity timer in response to receiving packets for unicast services. After the inactivity timer expires, the user equipment may perform sleep, i.e., the user equipment may stop receiving data packets from the base station.

Taking DRX cycle C2(U) as an example, assume that the period of the inactive timer is T1. The user equipment may start the inactive timer at time point t1 to receive data packets from the base station. Since the user equipment receives data packets for unicast services at time point t2, the user equipment may restart the inactive timer at time point t2. Then, since the user equipment does not receive data packets for unicast services during the operation of the inactive timer, the inactive timer expires at time point t3. Accordingly, the user equipment will end the discontinuous reception at time point t3.

The base station may transmit control information to the user equipment during the DRX cycle for unicast service, wherein the control information is, for example, a group-common DCP. The group-common DCP is used to instruct the user equipment to activate or deactivate discontinuous reception in the next DRX cycle for multicast broadcast service after the end of the current DRX cycle (which may be adjacent to or not adjacent to the current DRX cycle). Taking DRX cycle C2(U) as an example, it is assumed that the group-common DCP 12 instructs the user equipment to deactivate discontinuous reception during the next DRX cycle for multicast broadcast service after the end of DRX cycle C2(U). Since the DRX cycle C3(M) is the next DRX cycle for the multicast broadcast service after the DRX cycle C2(U) ends, the user equipment may turn off the discontinuous reception during the DRX cycle C3(M), that is, the user equipment may not receive data packets from the base station during the DRX cycle C3(M).

The base station may transmit control information to the user equipment during the DRX cycle for the multicast broadcast service, wherein the control information is, for example, an MBS scheduling assignment. The MBS scheduling assignment is used to indicate the user equipment the resources (e.g., time domain resources or frequency domain resources) for the multicast broadcast service. The user equipment may receive data packets from the base station through the resources. Taking the DRX cycle C3(M) as an example, it is assumed that the MBS scheduling assignment 13 does not indicate any available resources. After receiving the MBS scheduling assignment 13, the user equipment may decide to turn off the discontinuous reception during the DRX cycle C3(M) according to the MBS scheduling assignment 13.

In one embodiment, the group common DCP may include a sequence number of a packet corresponding to the multicast broadcast service. FIG2 shows a schematic diagram of a group common DCP 200 according to an embodiment of the present invention. The fields of the group common DCP 200 include a field 21 for indicating a service identifier (service ID, SID) of the multicast broadcast service and a sequence number for indicating the latest packet of the multicast broadcast service.

FIG3 is a schematic diagram of a discontinuous reception mechanism during a DRX cycle for a multicast broadcast service according to an embodiment of the present invention. The base station may transmit a group common DCP 31 to the user equipment during the DRX cycle C(U) for the unicast service to indicate the sequence number of the latest packet of the multicast broadcast service to the user equipment through the group common DCP 31. For example, if the sequence number of the latest multicast broadcast service packet indicated by the group common DCP 31 is 15, and the sequence number of the latest multicast broadcast service packet currently received by the user equipment is 13, it means that although the base station has provided packets with sequence numbers 14 and 15 for the multicast broadcast service, the user equipment has not yet received these packets.

During the next DRX cycle C(M) for the multicast broadcast service after the DRX cycle C(U) ends, the base station may transmit packets for the multicast broadcast service. Specifically, the base station may transmit an MBS schedule allocation 32 to the user equipment during the DRX cycle C(M). The MBS schedule allocation 32 is used to indicate the downlink resources used for the multicast broadcast service during the DRX cycle C(M). FIG. 4 is a schematic diagram of the MBS schedule allocation 32 according to an embodiment of the present invention. MBS schedule allocation 32 may include a field 41 for indicating a service identifier of a multicast broadcast service, a field 42 for indicating a sequence number of a first data packet provided by a base station during a DRX cycle C(M), a field 43 for indicating a sequence number of a last data packet provided by a base station during a DRX cycle C(M), and a field 44 for indicating time domain/frequency domain resource allocation. Field 44 may include a field 441 and a field 443 for indicating time domain resources, and may include a field 442 and a field 444 for indicating frequency domain resources.

Returning to FIG. 3 , MBS schedule allocation 32 may indicate to the user equipment the resource allocation of packets for the multicast broadcast service during the DRX cycle C(M), wherein the sequence number of the packet may be the sequence number of the packet indicated by the group common DCP 31 (i.e., 15) or the previous sequence number of the sequence number (i.e., the sequence number before 15). For example, MBS schedule allocation 32 indicates to the user equipment the resource locations of the packet with sequence number 13, the packet with sequence number 14, and the packet with sequence number 15.

The user equipment may determine whether the sequence number of the latest multicast broadcast service packet received by the user equipment in the DRX cycle before the DRX cycle C(M) (not limited to the DRX cycle for unicast service/multicast broadcast service) matches the sequence number of the packet indicated by the group common DCP 31. If the sequence number of the latest multicast broadcast service packet of the user equipment matches the sequence number of the packet indicated by the group common DCP 31, the user equipment may omit the discontinuous reception of the multicast broadcast service during the DRX cycle C(M). If the sequence number of the latest multicast broadcast service packet of the user equipment does not match the sequence number of the packet indicated by the group common DCP 31, the user equipment may perform the discontinuous reception of the multicast broadcast service during the DRX cycle C(M). More specifically, the user equipment may receive one or more MBS packets during period C(M), wherein the sequence numbers of the one or more MBS packets are subsequent to the sequence number of the latest MBS packet of the user equipment.

Specifically, if the sequence number of the packet indicated by the group common DCP 31 is equal to or precedes the sequence number of the latest multicast broadcast service packet received by the user equipment, the user equipment can determine that the latest multicast broadcast service packet of the user equipment matches the packet indicated by the group common DCP 31. If the sequence number of the packet indicated by the MBS scheduling allocation 32 is a subsequent sequence number of the sequence number of the latest multicast broadcast service packet received by the user equipment, the user equipment can determine that the latest multicast broadcast service packet of the user equipment does not match the packet indicated by the MBS scheduling allocation 32.

Taking FIG. 3 as an example, assume that the group common DCP 31 indicates that the sequence number of the packet is 13. The user equipment can determine that the sequence number 13 of the packet indicated by the group common DCP 31 is equal to the sequence number 13 of the latest multicast broadcast service packet received by the user equipment (i.e., the two sequence numbers match). Accordingly, the user equipment can omit the discontinuous reception of the multicast broadcast service during the DRX cycle C(M), thereby saving power consumption. Assume that the group common DCP 31 indicates that the sequence number of the packet is 15. The user equipment can determine that the sequence number 15 of the packet indicated by the group common DCP 31 is the subsequent sequence number of the sequence number 13 of the latest multicast broadcast service packet received by the user equipment (i.e., the two sequence numbers do not match). Accordingly, the user equipment may perform discontinuous reception of the multicast broadcast service during the DRX cycle C(M) to receive the packet with sequence number 14 and the packet with sequence number 15 corresponding to the multicast broadcast service.

FIG5 is a schematic diagram of a discontinuous reception mechanism for mixed unicast service and multicast broadcast service according to an embodiment of the present invention. In FIG5 , DRX cycles C1(M), C3(M), C5(M) and C7(M) are used for multicast broadcast service, and DRX cycles C2(U), C4(U), C6(U) and C8(U) are used for unicast service.

During the DRX cycle C1(M), the UE receives an individual DCP 51 from the base station, wherein the individual DCP 51 instructs the UE to activate discontinuous reception in the next DRX cycle for unicast service (ie, DRX cycle C2(U)).

During the DRX cycle C2(U), the user equipment activates discontinuous reception according to the individual DCP 51 to receive the unicast service packet or the multicast broadcast service packet provided by the base station during the inactive timer operation, wherein the sequence number of the multicast broadcast service packet is 10. On the other hand, the user equipment can receive the group common DCP 52 from the base station. The group common DCP 52 includes the sequence number 10 of the packet corresponding to the multicast broadcast service. The user equipment can determine that the sequence number indicated by the group common DCP 52 (i.e., sequence number 10) matches the sequence number of the latest multicast broadcast service packet received by the user equipment (i.e., sequence number 10), and further decides to omit the discontinuous reception of the multicast broadcast service in the DRX cycle C3(M).

During the DRX cycle C3(M), the base station may transmit an MBS schedule allocation 53 to the user equipment to indicate to the user equipment the resource locations of the multicast broadcast service packet with sequence number 10 and the unicast service packet. Since the user equipment omits the discontinuous reception during the DRX cycle C3(M), the user equipment will not receive the multicast broadcast service packet (e.g., the multicast broadcast service packet with sequence number 10) provided by the base station during the DRX cycle C3(M). The user equipment may receive an individual DCP 54 from the base station, wherein the individual DCP 54 instructs the user equipment to turn off the discontinuous reception in the next DRX cycle for unicast service (i.e., DRX cycle C4(U)).

During the DRX cycle C4(U), since the user equipment turns off the discontinuous reception of the unicast service, the user equipment will not receive the multicast broadcast service packets (e.g., multicast broadcast service packets with sequence numbers 11 or 12) provided by the base station during the DRX cycle C4(U). However, the user equipment can still receive the unicast service packets provided by the base station. On the other hand, the user equipment can receive the group common DCP 55 from the base station. The group common DCP 55 includes the sequence number 12 of the packet corresponding to the multicast broadcast service. The user equipment may determine that the sequence number indicated by the group common DCP 52 (ie, sequence number 12) does not match the sequence number of the latest multicast broadcast service packet received by the user equipment (ie, sequence number 10), and further decide to perform discontinuous reception of the multicast broadcast service in the DRX cycle C5(M).

During the DRX cycle C5(M), the base station may transmit an MBS schedule allocation 56 to the user equipment to indicate to the user equipment the resource locations of the multicast broadcast service packets and the unicast service packets with sequence numbers 11 and 12. The user equipment may receive the multicast broadcast service packets and the unicast service packets with sequence numbers 11 and 12 from the base station according to the MBS schedule allocation 56. That is, the sequence number of the latest multicast broadcast service packet received by the user equipment may be updated to 12. The user equipment may receive an individual DCP 57 from the base station, wherein the individual DCP 57 instructs the user equipment to activate discontinuous reception in the next DRX cycle for unicast service (i.e., DRX cycle C6(U)).

During the DRX cycle C6(U), the user equipment activates discontinuous reception according to the individual DCP 57 to receive the unicast service packet or the multicast broadcast service packet provided by the base station during the operation of the inactive timer, wherein the multicast broadcast service packet includes the sequence number 13. Since the base station transmits the multicast broadcast service packet with the sequence number 14 after the inactive timer expires, the user equipment cannot receive the multicast broadcast service packet with the sequence number 14. That is, the sequence number of the latest multicast broadcast service packet received by the user equipment can be updated to 13. On the other hand, the user equipment can receive the group common DCP 58 from the base station. The group common DCP 58 includes the sequence number 14 of the packet corresponding to the multicast broadcast service. The user equipment may determine that the sequence number indicated by the group common DCP 58 (ie, sequence number 14) does not match the sequence number of the latest multicast broadcast service packet received by the user equipment (ie, sequence number 13), and further decide to perform discontinuous reception of the multicast broadcast service in the DRX cycle C7(M).

During the DRX cycle C7(M), the base station may transmit MBS scheduling allocation 59 to the user equipment to indicate to the user equipment the resource locations of the MBSS packets with sequence numbers 13 and 14. Since sequence number 13 is not a subsequent sequence number of the sequence number of the latest MBSS packet received by the user equipment (i.e., sequence number 13), the user equipment does not need to receive the MBSS packet with sequence number 13. Since sequence number 14 is a subsequent sequence number of the sequence number of the latest MBSS packet received by the user equipment (i.e., sequence number 13), the user equipment may receive the MBSS packet with sequence number 14 from the base station according to MBS scheduling allocation 59. That is, the sequence number of the latest MBSS packet received by the user equipment may be updated to 14. On the other hand, the UE may receive an individual DCP 60 from the base station, wherein the individual DCP 60 instructs the UE to turn off the DRX in the next DRX cycle for the unicast service (ie, DRX cycle C8(U)).

During the DRX cycle C8(U), since the user equipment turns off the discontinuous reception of the unicast service, the user equipment will not receive the multicast broadcast service packet provided by the base station during the DRX cycle C8(U). On the other hand, the user equipment can receive the group common DCP 61 from the base station. The group common DCP 61 includes the sequence number 14 corresponding to the packet of the multicast broadcast service. The user equipment can determine that the sequence number indicated by the group common DCP 61 (i.e., sequence number 14) matches the sequence number of the latest multicast broadcast service packet received by the user equipment (i.e., sequence number 14), and then decide to omit the discontinuous reception of the multicast broadcast service in the next DRX cycle for the multicast broadcast service.

FIG6 is a schematic diagram of a base station 600 according to an embodiment of the present invention. The base station 600 may include a processor 610, a storage medium 620, and a transceiver 630.

The processor 610 is, for example, a central processing unit (CPU), or other programmable general-purpose or special-purpose micro control unit (MCU), microprocessor, digital signal processor (DSP), programmable controller, application specific integrated circuit (ASIC), graphics processing unit (GPU), image signal processor (ISP), image processing unit (IPU), arithmetic logic unit (ALU), complex programmable logic device (CPLD), field programmable gate array (FPGA), or other similar components or combinations of the above components. The processor 610 may be coupled to the storage medium 620 and the transceiver 630 , and access and execute a plurality of modules and various applications stored in the storage medium 620 .

The storage medium 620 is, for example, any type of fixed or removable random access memory (RAM), read-only memory (ROM), flash memory, hard disk drive (HDD), solid state drive (SSD) or similar elements or a combination of the above elements, and is used to store multiple modules or various applications that can be executed by the processor 610.

The transceiver 630 transmits and receives signals in a wireless or wired manner. The transceiver 630 may also perform operations such as low noise amplification, impedance matching, frequency mixing, up or down frequency conversion, filtering, amplification, and the like.

FIG7 is a flow chart of a method for discontinuous reception of a multicast broadcast service according to an embodiment of the present invention, wherein the method may be implemented by the base station shown in FIG6 . In step S701, first control information for a second discontinuous reception period is transmitted during a first discontinuous reception period, wherein the first control information includes a first sequence number corresponding to a first packet of the multicast broadcast service. In step S702, a second packet corresponding to the multicast broadcast service is transmitted during the second discontinuous reception period, wherein the second packet includes a second sequence number, and the second sequence number includes one of the first sequence number and a previous sequence number of the first sequence number.

FIG8 is a schematic diagram of a user equipment 800 according to an embodiment of the present invention. The user equipment 800 may include a processor 810, a storage medium 820, and a transceiver 830.

The processor 810 is, for example, a central processing unit, or other programmable general-purpose or special-purpose microcontroller unit, microprocessor, digital signal processor, programmable controller, special application integrated circuit, graphics processor, image signal processor, image processing unit, arithmetic logic unit, complex programmable logic device, field programmable logic gate array or other similar components or combinations of the above components. The processor 810 can be coupled to the storage medium 820 and the transceiver 830, and access and execute multiple modules and various applications stored in the storage medium 820.

The storage medium 820 is, for example, any type of fixed or removable random access memory, read-only memory, flash memory, hard disk, solid state drive or similar element or a combination of the above elements, and is used to store multiple modules or various applications that can be executed by the processor 810.

The transceiver 830 transmits and receives signals wirelessly or wiredly. The transceiver 830 may also perform operations such as low noise amplification, impedance matching, frequency mixing, up or down frequency conversion, filtering, amplification, and the like.

FIG9 is a flow chart of a method for discontinuous reception of a multicast broadcast service according to an embodiment of the present invention, wherein the method may be implemented by the user equipment 800 shown in FIG8 . In step S901, first control information for a second discontinuous reception period is received during a first discontinuous reception period, wherein the first control information includes a first sequence number corresponding to a first packet of the multicast broadcast service. In step S902, a second packet is received before the second discontinuous reception period, wherein the second packet includes a second sequence number; and it is determined whether the first sequence number matches the second sequence number.

In summary, the base station of the present invention can transmit control information with a number to the user equipment to inform the user equipment of the progress of the current multicast broadcast service. The user equipment can decide to activate or deactivate the discontinuous reception during the discontinuous reception period for the multicast broadcast service according to the control information and the multicast broadcast service packets received by the user equipment. Accordingly, the present invention can reduce the power consumption of the user equipment without missing the multicast broadcast service packets.

11, 51, 54, 57, 60: Individual DCP 12, 200, 31, 52, 55, 58, 61: Group common DCP 13, 32, 53, 56, 59: MBS scheduling allocation 21, 22, 41, 42, 43, 44, 441, 442, 443, 444: Field 600: Base station 610, 810: Processor 620, 820: Storage medium 630, 830: Transceiver 800: User equipment S701, S702, S901, S902: Steps C1(M), C2(U), C3(M), C4(U), C5(M), C6(U), C7(M), C8(U), C(U), C(M): DRX cycle T1: cycle t1, t2, t3: time point

FIG. 1 is a schematic diagram of a DRX cycle according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a group common DCP according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a discontinuous reception mechanism during a DRX cycle for a multicast broadcast service according to an embodiment of the present invention. FIG. 4 is a schematic diagram of an MBS scheduling allocation according to an embodiment of the present invention. FIG. 5 is a schematic diagram of a discontinuous reception mechanism for a hybrid unicast service and a multicast broadcast service according to an embodiment of the present invention. FIG. 6 is a schematic diagram of a base station according to an embodiment of the present invention. FIG. 7 is a flow chart of a method for discontinuous reception of a multicast broadcast service according to an embodiment of the present invention. FIG. 8 is a schematic diagram of a user equipment according to an embodiment of the present invention. FIG9 is a flow chart of a method for discontinuous reception of multicast broadcast services according to an embodiment of the present invention.

S701, S702: Steps

Claims (13)

A method for discontinuous reception of a multicast broadcast service, applicable to a base station, comprising: Transmitting first control information for a second discontinuous reception period during a first discontinuous reception period, wherein the first control information includes a first sequence number corresponding to a first packet of the multicast broadcast service. The method of claim 1 further comprises: transmitting a second packet corresponding to the multicast broadcast service during the second discontinuous reception period, wherein the second packet comprises a second sequence number, and the second sequence number comprises one of the first sequence number and a previous sequence number of the first sequence number. A method as described in claim 1, wherein the second discontinuous reception period for the multicast broadcast service is between the first discontinuous reception period for the unicast service and the third discontinuous reception period for the unicast service, and the second discontinuous reception period does not overlap with the first discontinuous reception period and the third discontinuous reception period in the time domain. The method as described in claim 1 further comprises: Transmitting second control information for a third discontinuous reception cycle during the second discontinuous reception cycle, wherein the third discontinuous reception cycle is used for unicast service, wherein the second control information indicates whether the user equipment performs discontinuous reception during the third discontinuous reception cycle. The method of claim 1 further comprises: providing at least one of a unicast service and the multicast broadcast service to the user equipment during the first discontinuous reception period; and providing the multicast broadcast service to the user equipment during the second discontinuous reception period. A method for discontinuous reception of a multicast broadcast service, applicable to a user equipment, comprising: Receiving first control information for a second discontinuous reception period during a first discontinuous reception period, wherein the first control information includes a first sequence number corresponding to a first packet of the multicast broadcast service. The method as described in claim 6 further includes: receiving a second packet before the second discontinuous reception cycle, wherein the second packet includes a second sequence number; and determining whether the first sequence number matches the second sequence number. As described in claim 7, the step of determining whether the first sequence number matches the second sequence number comprises: In response to the first sequence number including the second sequence number and one of the previous sequence numbers of the second sequence number, determining that the first sequence number matches the second sequence number; and In response to the first sequence number including the subsequent sequence number of the second sequence number, determining that the first sequence number does not match the second sequence number. The method as described in claim 7 further includes: In response to the first sequence number matching the second sequence number, omitting the discontinuous reception of the multicast broadcast service during the second discontinuous reception period. The method of claim 7 further comprises: In response to the first sequence number not matching the second sequence number, performing discontinuous reception of the multicast broadcast service during the second discontinuous reception period. The method of claim 6 further comprises: In response to receiving a data packet for a unicast service during the first discontinuous reception period, restarting an inactivity timer; and Performing sleep after the inactivity timer expires. A base station comprises: a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to perform: transmitting first control information for a second discontinuous reception cycle through the transceiver during a first discontinuous reception cycle, wherein the first control information includes a first sequence number corresponding to a first packet of a multicast broadcast service. A user equipment comprises: a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to perform: receiving first control information for a second discontinuous reception period during a first discontinuous reception period, wherein the first control information comprises a first sequence number corresponding to a first packet of a multicast broadcast service.

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