CN111385881B

CN111385881B - Base station and resource allocation method based on semi-permanent scheduling

Info

Publication number: CN111385881B
Application number: CN201811614415.2A
Authority: CN
Inventors: 黄任锋
Original assignee: Industrial Technology Research Institute ITRI
Current assignee: Industrial Technology Research Institute ITRI
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2023-06-20
Anticipated expiration: 2038-12-27
Also published as: CN111385881A

Abstract

The invention provides a base station and a resource allocation method based on Semi-permanent scheduling (Semi-Persistent Scheduling, SPS) thereof. The method comprises the following steps: periodically receiving a plurality of uplink data corresponding to a user equipment on radio resources assigned to the user equipment; in response to continuously receiving a predetermined number of specific uplink data from the ue, performing a release SPS operation to stop receiving other uplink data corresponding to the ue on the radio resource, wherein the specific uplink data is composed of pending data and error data or is composed of only error data.

Description

Base station and resource allocation method based on semi-permanent scheduling

Technical Field

The present invention relates to a base station and a resource allocation method thereof, and more particularly, to a base station and a resource allocation method thereof based on Semi-persistent scheduling (Semi-Persistent Scheduling, SPS).

Background

In packet transmission in a mobile network, dynamic scheduling (Dynamic Scheduling) is generally used. Dynamic scheduling may be understood as starting to request radio resources available for transmitting data at the instant of transmission. In general, uplink data transmitted by a User Equipment (UE) is based on a scheduling request (Scheduling Request) to request radio resources.

Unlike the dynamic scheduling mechanism described above, SPS allows enhanced node B (eNB) to semi-statically configure radio resources to periodically allocate radio resources to a particular UE. Because of the characteristics of the SPS that can be continuously and stably scheduled and the need for control packets (e.g., downlink control information (downlink control information, DCI) packets) can be saved, in cellular systems, SPS can be used for transmission of Voice over LTE (VoLTE) or other future communication systems, such as 5G systems, of LTE networks. Since SPS requires only one schedule to achieve the effect of multiple transmissions, the SPS mechanism is important for cellular systems that are to perform VoLTE.

According to the specification in 3GPP TS 36.321, when an SPS mechanism is employed between a UE and an eNB, the eNB periodically allocates resources to the UE. Accordingly, the UE may also periodically transmit data to the eNB via an uplink (uplink). If the UE ends the call without using the allocated resources, the UE transmits a predetermined amount of pending data.

However, in some cases, if the eNB cannot successfully receive the above-mentioned pending data, a situation may occur in which radio resources are wasted.

Disclosure of Invention

The invention provides a resource allocation method based on SPS, which is suitable for a base station and comprises the following steps: periodically receiving a plurality of Uplink (UL) data corresponding to a user equipment on a radio resource assigned to the user equipment; in response to continuously receiving a predetermined number of specific uplink data from the ue, performing a release SPS operation to stop receiving other uplink data corresponding to the ue on the radio resource, wherein the specific uplink data is composed of at least one undefined data and at least one error data, or is composed of only at least one error data.

The invention provides a base station, which comprises a storage circuit, a transceiver and a processor. The memory circuit stores a plurality of modules. The processor is coupled with the transceiver and the storage circuit, and accesses the modules to execute the following steps: controlling the transceiver to periodically receive a plurality of Uplink (UL) data corresponding to a user equipment on a radio resource assigned to the user equipment; in response to continuously receiving a predetermined number of specific uplink data from the ue, performing a release semi-persistent scheduling (semi-persistent scheduling, SPS) operation to stop receiving other uplink data of the corresponding ue on the radio resource, wherein the specific uplink data is composed of at least one pending data and at least one error data or is composed of only at least one error data.

Based on the above, the base station and the SPS-based resource allocation method thereof according to the present invention can enable the base station to release the radio resources allocated to the UE after continuously receiving a predetermined number of specific uplink data (which consists of the non-data and at least one error data). Thus, unnecessary waste of wireless resources due to CRC error can be avoided, and communication efficiency can be improved.

In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic diagram of an SPS mechanism according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an end SPS mechanism according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an ending SPS mechanism according to another embodiment of the present invention.

Fig. 4 is a schematic diagram illustrating resource waste according to an embodiment of the invention.

Fig. 5 is an implicit release diagram in a C-RAN architecture according to an embodiment of the present invention.

Fig. 6 is a block diagram of an eNB according to an embodiment of the present invention.

FIG. 7 is a flow chart of a SPS-based resource allocation method according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of a release SPS mechanism according to an embodiment of the present invention.

FIG. 9 is a schematic diagram of a release SPS mechanism according to another embodiment of the present invention.

[ symbolic description ]

410. 510, 811-818, 918: undefined data

600：eNB

602: memory circuit

604: transceiver with a plurality of transceivers

606: processor and method for controlling the same

810、910：UE

818a, 918a: error data

S710 to S720: step (a)

Detailed Description

Referring to fig. 1, an SPS mechanism is schematically shown according to an embodiment of the invention, wherein a horizontal axis represents time. In this embodiment, the eNB may have a physical layer (L1 for short), a medium access control layer (medium access control layer for short, L2) and a radio link control layer (radio link control layer for short, L3).

As shown in fig. 1, when the eNB wants to communicate with the UE using SPS, the eNB L3 may send a UE reconfiguration (UE re-configuration) signal to the UE to enable SPS UL. After the UE receives this UE reconfiguration signal, the UE may learn that UL data is about to be transmitted to the eNB based on the SPS mechanism.

The eNB L2 may then send an SPS UL activation signal to the UE to formally activate the SPS mechanism. Thereafter, the UE may periodically transmit UL data using the radio resources allocated by the eNB L2. Accordingly, the eNB L2 may control the eNB L1 to periodically listen to UL data transmitted by the UE on radio resources allocated to the UE based on the UL configuration signal. In the present embodiment, the SPS period in which the UE transmits UL data is, for example, 20ms, but the present invention may not be limited thereto. In other embodiments, the SPS period may also be adjusted to other values specified in the specification, such as 160ms, etc. In the present embodiment, taking the LTE system as an example, the SPS UL start signal is a DCI (downlink control information, DCI) packet, but may not be limited thereto, and the SPS UL start signal is determined according to an instruction or a packet for controlling SPS in a different communication system.

In various embodiments, the SPS mechanism may be terminated in the manner described in fig. 2 and 3.

Referring to fig. 2, a schematic diagram of an SPS ending mechanism according to an embodiment of the invention is shown, in which a horizontal axis represents time. In this embodiment, when the eNB wants to terminate the SPS mechanism, the eNB L2 may send an SPS UL release (release) signal to the UE. Accordingly, the UE does not continue to periodically transmit UL data, and the eNB L2 does not control the eNB L1 to periodically listen to UL data transmitted by the UE on the radio resources allocated to the UE based on the UL configuration signal. In the present embodiment, taking the LTE system as an example, the SPS UL release signal is a DCI (downlink control information, DCI) packet, but may not be limited thereto, and the SPS UL release signal is determined according to an instruction or a packet for controlling SPS in a different communication system.

Referring to fig. 3, a schematic diagram of an SPS ending mechanism according to another embodiment of the invention is shown, wherein a horizontal axis represents time. In this embodiment, if the UE wants to end the SPS mechanism, the UE may continuously send a predetermined number (hereinafter referred to as N) of undefined data to the eNB L2, where the undefined data includes, for example, only a header (header) and no payload (payload). Thereafter, the UE may release the SPS. That is, the UE no longer (periodically) transmits UL data to the eNB. Accordingly, after the eNB L2 continuously receives a preset number of pending data, the eNB L2 may also release SPS. In other words, the eNB L2 may no longer control the eNB L1 to periodically listen to UL data transmitted by the UE on the radio resources allocated to the UE based on the UL configuration signal, i.e., not reallocate the radio resources to the UE. In the present embodiment, the above-mentioned preset number is, for example, 8, which may be specified by the eNB L3 in the SPS-enabled UL signal, but the present invention may not be limited thereto.

In the present invention, the mechanism shown in fig. 3 may also be referred to as implicit release (implicit release). However, in the mechanism of implicit release, if some of the pending data is not successfully received by the eNB, the UE and the eNB may not release SPS smoothly, which may cause waste of resources.

Referring to fig. 4, a schematic diagram of wasting resources is shown according to an embodiment of the invention, in which the horizontal axis represents time. In this embodiment, it is assumed that the UE has continuously transmitted a predetermined number (i.e., 8) of pending data, but the pending data 410 (i.e., the 8 th pending data) may not be correctly received by the eNB due to poor channel conditions or other similar reasons. Specifically, after the eNB receives the pending data 410, the eNB may first perform an operation such as cyclic redundancy check (cyclic redundancy check, CRC) on the pending data 410 to confirm whether the checksum calculated based on the pending data 410 is correct. However, in a scenario where the channel condition is poor, the eNB may determine that a CRC error (CRC error) occurred because the CRC operation on the pending data 410 cannot be successfully completed. In this case, the eNB may request the UE to transmit the pending data 410 again based on the mechanism of the hybrid automatic repeat request (hybrid automatic repeat request, HARQ).

However, the eNB cannot determine whether the pending data 410 is indeed an pending data before the eNB successfully receives the pending data 410 (e.g., completes a CRC operation on the pending data 410 and successfully parses the content of the pending data 410). At this time, if the pending data 410 cannot be successfully received late due to too bad channel conditions, the enb may need to request the UE to retransmit the pending data based on HARQ over and over again. In this case, radio resources are unnecessarily occupied, and thus waste is caused.

In addition, after the UE continuously transmits a preset number of pending data, it is also possible to directly perform the operation of releasing SPS and not transmit other data. However, if the eNB misjudges the unsuccessfully received pending data 410 as UL data, the eNB L2 still controls the eNB L1 to listen to UL data transmitted by the UE on the radio resources allocated to the UE based on the UL configuration signal. Since the UE has released SPS, the eNB L1 will not receive UL data transmitted by the UE, in the same manner as wasting radio resources.

Further, it is assumed that the UE transmits one UL data after continuously transmitting (N-1) uncertain data, but the UL data is not successfully parsed by the eNB. In this case, if the eNB misjudges the UL data that was not successfully received as the pending data, the eNB will perform the operation of releasing SPS by judging that N pending data are continuously received. That is, the eNB L1 can no longer listen to the transmitted UL data on the radio resources allocated to the UE. As such, the data subsequently transmitted by the UE cannot be successfully transmitted to the eNB.

Further, after the eNB releases SPS, the eNB may also allocate radio resources originally allocated to the UE to other UEs. In this case, 2 UEs may collide (collided) with each other by transmitting using the same radio resource.

In an embodiment, when a radio link failure (Radio Link Failure) occurs between the UE and the eNB, the eNB may also need to initiate a corresponding connection recovery mechanism. However, this recovery mechanism will likely take up to 10000ms at most, and thus will reduce the overall system performance.

Furthermore, similar problems as described above may also occur in the architecture of a centralized radio access network (centralized radio access network, C-RAN). Specifically, in the C-RAN, the eNB L1 and the eNB L2 may be disposed in different machines, respectively, so that there may be a certain delay (latency) in transmission between the eNB L1 and the eNB L2. In this case, when the eNB L2 receives the data retransmitted by the UE according to the HARQ scheme, the eNB L2 first transmits an HARQ Acknowledgement (ACK) signal, regardless of whether the eNB L1 has correctly received the data. However, in the context of implicit release, the above mechanism would likely result in waste of radio resources.

Fig. 5 is an implicit release diagram in the C-RAN architecture according to an embodiment of the present invention, wherein the horizontal axis represents time. In the present embodiment, it is assumed that the UE has continuously transmitted N pieces of pending data and released SPS, but the eNB has a CRC error when parsing the pending data 510 (i.e., nth pending data). As described in the previous embodiment, the eNB L2 may transmit the HARQ ACK first. However, since the eNB does not parse the pending data 510 correctly, it is still possible to again attempt to listen to the data from the UE after the SPS period, as a waste of radio resources. Meanwhile, since the UE does not transmit any data after the SPS period, the eNB will likely decide that a CRC error occurs again. In addition, when the eNB L2 finds that the pending data 510 is not properly parsed, the eNB L2 may also ask the UE to retransmit the pending data 510 through a DCI request.

In view of the above, the present invention provides a base station and a scheduling method thereof, which can solve the above-mentioned problems.

Fig. 6 is a block diagram of an eNB according to an embodiment of the invention. In the present embodiment, the eNB 600 may be widely understood as a general base station, a macro cell base station (macro-cell base station), a micro cell base station (pico-cell base station), a remote radio head (remote radio head, RRH), or the like, but may not be limited thereto.

As shown in fig. 6, eNB 600 may include a memory circuit 602, a transceiver 604, and a processor 606. The Memory circuit 602 is, for example, any type of fixed or removable random access Memory (Random Access Memory, RAM), read-Only Memory (ROM), flash Memory (Flash Memory), hard disk or other similar device or combination of these devices, and may be used to record a plurality of program codes or modules.

The transceiver 604 may include components of, but is not limited to, transmitter circuitry, receiver circuitry, analog-to-digital (a/D) converters, digital-to-analog (D/a) converters, low noise amplifiers (low noise amplifier, LNAs), mixers, filters, matching circuits, transmission lines, power Amplifiers (PAs), one or more antenna elements, and local storage media to provide wireless transmission functionality for the eNB 600 of fig. 6.

The receiver circuit may include functional units to perform operations such as low noise amplification, impedance matching, frequency mixing, down-frequency conversion, filtering, amplification, and the like. The transmitter circuit may include functional units to perform operations such as amplification, impedance matching, frequency mixing, up-frequency conversion, filtering, power amplification, and the like. The a/D converter or D/a converter is configured to convert the analog signal format into a digital signal format during upstream signal processing and to convert the digital signal format into an analog signal format during downstream signal processing.

The processor 606 is coupled to the memory circuit 602 and the transceiver 604, and may be a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, a controller, a microcontroller, an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array circuit (Field Programmable Gate Array, FPGA), any other type of integrated circuit, a state machine, an advanced reduced instruction set machine (Advanced RISC Machine, ARM) based processor, and the like.

In an embodiment of the present invention, the processor 606 may load program code or modules recorded in the memory circuit 602 to perform the SPS-based resource allocation method set forth in the present invention, as will be further described below.

Referring to fig. 7, a flowchart of an SPS-based resource allocation method according to an embodiment of the invention is shown. The method of this embodiment may be performed by the eNB 600 of fig. 6, and details of each step of fig. 7 are described below with reference to elements shown in fig. 6.

First, in an embodiment, the processor 606 may schedule radio resources for the UE based on an SPS mechanism. In an embodiment, the processor 606 may send the SPS UL start signal shown in fig. 1-3 to the UE to inform the UE of its allocated radio resources. Accordingly, the UE may periodically transmit uplink data to the eNB 600 using the allocated radio resources. In the present embodiment, taking the LTE system as an example, the SPS UL start signal is a DCI (downlink control information, DCI) packet, but may not be limited thereto, and the SPS UL start signal is determined according to an instruction or a packet for controlling SPS in a different communication system.

In step S710, the processor 606 may control the transceiver 604 to periodically receive a plurality of UL data corresponding to the UE on radio resources assigned to the UE. In one embodiment, the processor 606 may control the transceiver 604 to periodically receive uplink data transmitted by the UE on the radio resources according to UL configuration signals as shown in fig. 1-3. Details of the above-mentioned SPS-based mechanism for scheduling radio resources for the UE, and details of step S710 may refer to the descriptions in the previous embodiments, and are not described herein.

Thereafter, in response to continuously receiving a preset number of specific uplink data from the UE, the processor 606 may perform a release SPS operation to stop receiving other uplink data of the corresponding UE on the radio resource in step S720. In the embodiment of the invention, the predetermined number of specific uplink data may be composed of at least one undefined data and at least one error data, or may be composed of only error data, wherein the error data is, for example, CRC error data, but the invention is not limited thereto.

In one embodiment, the processor 606 may initially set a count value to 0, where such count value may be characterized as the number of specific upstream data that have been received in succession. Then, each time the processor 606 receives an uplink data from the UE, the processor 606 can determine whether the uplink data belongs to the pending data or the erroneous data. If so, the processor 606 may accumulate the count value. On the other hand, if the uplink data does not belong to the pending data or the erroneous data, it means that the uplink data is normal uplink data with a payload. In this case, the processor 606 may reset the count value to 0. When the count value is incremented to a predetermined number, it represents that the processor 606 has continuously received a predetermined number of specific uplink data from the UE. Accordingly, the processor 606 may perform a release SPS operation accordingly to release the radio resources, although the invention may not be limited thereto.

To make the concept of step S720 clearer, the following description is further given with reference to fig. 8. Fig. 8 is a schematic diagram of a SPS release mechanism according to an embodiment of the invention, wherein the horizontal axis represents time. In the present embodiment, it is assumed that the preset number is 8 (i.e., N is 8), and the UE 810 continuously transmits 8 pieces of

undefined data

811, 812, …, 818. However, eNB 600 generates a CRC error when parsing the pending data 818. That is, after eNB 600 successfully analyzes 7-stroke undefined data 811 to 817, it is determined that 1-stroke erroneous data 818a has occurred.

At this time, the eNB 600 may determine that a predetermined number of specific uplink data (i.e., 7 pending data 811-817 and 1 error data, of which pending data 813-817 are not shown) have been continuously received, and thus may perform a release SPS operation to stop receiving other uplink data of the corresponding UE 810 on the radio resource allocated to the UE 810. In addition, the eNB 600 may also control the UE 810 to also perform SPS release operation through SPS UL release signal. In the present embodiment, taking the LTE system as an example, the SPS UL release signal is a DCI (downlink control information, DCI) packet, but may not be limited thereto, and the SPS UL release signal is determined according to an instruction or a packet for controlling SPS in a different communication system.

That is, in response to the eNB 600 determining that a predetermined number of specific uplink data have been continuously received, both the eNB 600 and the UE 810 will perform the SPS release operation. Thus, various situations of wasting radio resources mentioned in the previous embodiments can be avoided, and the performance of the whole system can be improved.

It should be understood that the specific uplink data pattern shown in fig. 8 is only used as an example, and is not meant to limit the possible embodiments of the present invention. In other embodiments, the data in which the CRC error occurs may be one or more of the pending data 811-817, and is not limited to the pending data 818. In short, as long as the eNB 600 determines that N consecutive specific uplink data composed of the pending data and the error data have been received, both the eNB 600 and the UE 810 may perform the SPS release operation, so as to achieve the effect of saving uplink resources.

Furthermore, compared to the method of up to 10000ms in fig. 4, the method of the present invention consumes little time, thereby improving the efficiency of the whole system.

Further, in an embodiment, after both eNB 600 and UE 810 perform the SPS release operation, eNB 600 may send SPS UL start signals again to UE 810 to restart SPS mechanisms between eNB 600 and UE 810. Thereafter, the eNB 600 and the UE 810 may communicate again based on the manner shown in fig. 1, and details thereof will not be described herein. In the present embodiment, taking the LTE system as an example, the SPS UL start signal is a DCI (downlink control information, DCI) packet, but may not be limited thereto, and the SPS UL start signal is determined according to an instruction or a packet for controlling SPS in a different communication system.

Furthermore, in an embodiment, the method proposed by the present invention is equally applicable to enbs 600 belonging to a C-RAN.

Fig. 9 is a schematic diagram of a SPS release mechanism according to another embodiment of the invention, wherein the horizontal axis represents time. In the present embodiment, it is assumed that the preset number is 8 (i.e., N is 8), and the undefined data 918 is, for example, the 8 th undefined data transmitted by the UE 910 after continuously transmitting 7 undefined data (not shown). However, as shown in fig. 9, the eNB 600 generates a CRC error when the pending data 918 is analyzed. That is, after the eNB 600 successfully analyzes 7 pieces of undefined data, it is determined that 1 piece of error data 918a has occurred.

As described in the previous embodiments, the L2 of the eNB 600 will transmit the HARQ ACK back to the UE before specifically recognizing that the CRC error occurs. However, since the eNB 600 determines that a preset number of specific uplink data (i.e., 7 pending data and 1 error data) have been continuously received at this time, a release SPS operation may be performed to stop receiving other uplink data of the corresponding UE 910 on the radio resource allocated to the UE 910. In addition, eNB 600 may also control UE 910 to also perform SPS release operations via SPS UL release signals. In the present embodiment, taking the LTE system as an example, the SPS UL release signal is a DCI (downlink control information, DCI) packet, but may not be limited thereto, and the SPS UL release signal is determined according to an instruction or a packet for controlling SPS in a different communication system.

That is, in response to the eNB 600 determining that a predetermined number of specific uplink data has been continuously received, both the eNB 600 and the UE 910 will perform the SPS release operation. Thus, various situations of wasting radio resources mentioned in the previous embodiments can be avoided, and the performance of the whole system can be improved.

Then, after the L2 of the eNB 600 finds that a CRC error occurs, the eNB 600 may request the UE 910 to retransmit the pending data 918 through the DCI request to complete the transmission with the UE 910.

In summary, the base station and the SPS-based resource allocation method thereof according to the present invention enable the base station to release the radio resources allocated to the UE after continuously receiving a predetermined number of specific uplink data (which consists of the non-data and at least one error data). Thus, unnecessary waste of wireless resources due to CRC error can be avoided, and communication efficiency can be improved. In addition, for the base station belonging to the C-RAN, the method of the invention can also be used for avoiding unnecessary waste of wireless resources due to CRC error and improving communication efficiency

Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, but rather may be modified or altered somewhat by persons skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. A resource allocation method based on semi-permanent scheduling, adapted for a base station, comprising:

periodically receiving a plurality of Uplink (UL) data corresponding to a user equipment on a radio resource assigned to the user equipment;

in response to continuously receiving a predetermined number of specific uplink data from the ue, performing a release semi-persistent scheduling SPS (semi-persistent scheduling) operation to stop receiving other uplink data corresponding to the ue on the radio resource, wherein the specific uplink data is composed of at least one uncertain data and at least one erroneous data;

initially setting a count value to 0;

responsive to receiving first uplink data from the ue, determining whether the first uplink data belongs to the at least one uncertain data or the at least one erroneous data;

responsive to determining that the first upstream data belongs to the at least one uncertain data or the at least one erroneous data, accumulating the count value;

in response to determining that the first upstream data does not belong to the at least one pending data or the at least one erroneous data, the count value is reset to 0.

2. The method of claim 1, wherein each of the error data is cyclic redundancy check error data.

3. The method of claim 1, wherein each of the pending data includes a header and no payload.

4. The method of claim 1, wherein in response to the count value being equal to the predetermined number, determining that the predetermined number of specific uplink data has been received consecutively from the user equipment.

5. The method of claim 1, further comprising:

and controlling the user equipment to execute the SPS release operation so as to control the user equipment to stop transmitting other uplink data on the wireless resource.

6. The method of claim 1, further comprising:

the radio resource is scheduled for the user equipment based on an SPS mechanism.

7. The method of claim 6, wherein prior to the step of scheduling the radio resources for the user equipment based on the SPS mechanism, further comprising:

an SPS UL enable signal is sent to the ue to enable the SPS mechanism between the base station and the ue.

8. The method of claim 7, wherein after performing the step of releasing SPS operations, further comprising:

the SPS UL enable signal is again sent to the ue to restart the SPS mechanism between the base station and the ue.

9. The method of claim 7, wherein the base station belongs to a centralized radio access network.

10. A base station, comprising:

a memory circuit that stores a plurality of modules;

a transceiver; and

a processor coupled to the transceiver and the memory circuit, accessing the modules to perform the following steps:

controlling the transceiver to periodically receive a plurality of Uplink (UL) data corresponding to the user equipment on radio resources assigned to the user equipment;

in response to continuously receiving a predetermined number of specific uplink data from the ue, performing a release semi-persistent scheduling (semi-persistent scheduling, SPS) operation to stop receiving other uplink data corresponding to the ue on the radio resource, wherein the specific uplink data is composed of at least one undefined data and at least one erroneous data;

initially setting a count value to 0;

11. The base station of claim 10 wherein each of the error data is cyclic redundancy check error data.

12. The base station of claim 10, wherein each of the pending data includes a header and no payload.

13. The base station of claim 10, wherein in response to the count value being equal to the predetermined number, the processor is further configured to determine that the predetermined number of particular uplink data has been received consecutively from the user equipment.

14. The base station of claim 10, wherein the processor is further configured to:

15. The base station of claim 10, wherein the processor is further configured to:

16. The base station of claim 15, wherein the processor is further configured to:

the transceiver is controlled to transmit an SPS UL enable signal to the ue to enable the SPS mechanism between the base station and the ue.

17. The base station of claim 16, wherein the processor is further configured to:

the transceiver is controlled to send the SPS UL enable signal to the ue again to restart the SPS mechanism between the base station and the ue.

18. The base station of claim 16, wherein the base station belongs to a centralized radio access network.