Patent Application
20230328728
The present application claims a priority of Chinese patent application No. 202010855582.7 filed on Aug. 20, 2020, which is incorporated herein by reference in its entirety.
The present disclosure relates to the field of communications technologies, and in particular, to a downlink channel transmission method, and a downlink channel transmission device.
In a related XR (Extended Reality) architecture based on grid split rendering, as shown in
For XR, and in particular cloud gaming, there are very high requirements on latency, for example the end-to-end latency requirement for cloud gaming is less than 5 ms, while the throughput thereof can reach hundreds of megabytes. Currently, XR transmission is assumed to be based on 5G standardized eMMB (Enhanced Mobile Broadband) and URLLC (Ultra-reliable and Low Latency Communication) technologies, in particular URLLC technologies.
The standardized transmission scheme based on slot aggregation technology in Rel-15 stage of NR (New Radio) mainly aims at enhancing coverage and providing transmission reliability, so that the technology can be suitable for URLLC scene, HARQ latency is reduced, and low-latency and high-reliability transmission is realized. However, the URLLC optimization mainly adopts a small packet transmission scenario, which brings system overhead that can be almost ignored. However, the XR scene corresponds to 4K and 8K high definition video real-time transmission, the throughput is large, PDSCH transmission adopting semi-static configuration cannot adapt to the change of outdoor scene channels, and large system overhead is brought. On the other hand, the related PDSCH repetition transmission scheme based on the time slot may not ensure that the XR service is correctly transmitted at one time, and HARQ transmission based on the slots aggregation may cause a scenario that the latency performance cannot meet a high requirement on latency, for example, a cloud game.
There is currently no specific implementation of the enhancement to 5G for XR.
The present disclosure is directed to a downlink channel transmission method and device, so as to solve the problems of large system overhead and large latency caused by the transmission of a related XR service.
In order to achieve the above object, a downlink channel transmission method is provided in an embodiment of the present disclosure, applied to a base station and including:
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Optionally, the resource mapping mode includes one of:
Optionally, the resource mapping mode is method II, and the method further includes:
Optionally, the resource mapping mode is method II, and the method further includes:
Optionally, the transmission parameter is pre-agreed, or configured by a base station.
Optionally, the transmission parameter is configured by the base station;
Optionally, the indicating the transmission parameter of the PDSCH to the terminal through the high-layer signaling and/or the physical layer dynamic signaling includes:
Optionally, the method further includes:
Optionally, the indicating the transmission parameter of the PDSCH to the terminal through the physical layer dynamic signaling includes:
Optionally, the indicating explicitly the number of times of repetition transmission of the PDSCH to the terminal through the physical layer dynamic signaling includes:
Optionally, the indicating implicitly the number of times of repetition transmission of the PDSCH to the terminal through the physical layer dynamic signaling includes:
Optionally, the method further includes:
Optionally, the indicating to the terminal whether to skip the PDCCH MO in the first time interval includes:
Optionally, the indicating to the terminal whether to skip the PDCCH MO in the first time interval through the physical layer dynamic signaling includes:
Optionally, the indicating explicitly to the terminal whether to skip the PDCCH MO in the first time interval through the physical layer dynamic signaling includes:
Optionally, the indicating implicitly to the terminal whether to skip the PDCCH MO in the first time interval through the physical layer dynamic signaling includes:
Optionally, subsequent to the indicating to the terminal whether to skip the PDCCH MO in the first time interval, the method further includes:
Optionally, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the first time interval is a PDSCH transmission time.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission and a number of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
In order to achieve the above object, a downlink channel transmission method is further provided in an embodiment of the present disclosure, applied to a terminal and including:
Optionally, the transmission parameter is pre-agreed, or indicated by a base station.
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Optionally, the resource mapping mode includes one of:
Optionally, the transmission parameter is indicated by the base station;
Optionally, the first signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a first field included in downlink control information (DCI), and the first field is configured to indicate the number of times of repetition transmission of the PDSCH;
Optionally, the method further includes:
Optionally, the resource mapping mode is method II, and the method further includes:
Optionally, the method further includes:
Optionally, when the base station indicates to skip the PDCCH MO in the first time interval, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the determining whether to skip the PDCCH MO in the first time interval based on the indication from the base station includes:
Optionally, the second signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a second field included in DCI, and the second field is configured to indicate whether to skip the PDCCH MO in the first time interval;
Optionally, the first time interval is a PDSCH transmission time.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission time and a number of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
In order to achieve the above object, a downlink channel transmission device is provided in an embodiment of the present disclosure, including: a memory, a transceiver, a processor, where a memory is configured to store program instructions, the transceiver is configured to send and receive data under a control of the processor, the processor is configured to read the program instructions in the memory to perform:
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Optionally, the resource mapping mode includes one of:
Optionally, the resource mapping mode is two, and the processor is configured to read the program instructions in the memory to perform:
Optionally, the resource mapping mode is method II, and the processor is configured to read the program instructions in the memory to perform:
Optionally, the transmission parameter is pre-agreed, or configured by a base station.
Optionally, the transmission parameter is configured by the base station;
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the transceiver is configured to perform:
Optionally, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the first time interval is a PDSCH transmission time.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission time and a number of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
In order to achieve the above object, a downlink channel transmission device is further provided in an embodiment of the present disclosure, including:
In order to achieve the above object, a downlink channel transmission device is further provided in an embodiment of the present disclosure, including: a memory, a transceiver, a processor, where the memory is configured to store program instructions, the transceiver is configured to send and receive data under a control of the processor, and the processor is configured to read the program instructions in the memory to perform:
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Optionally, the resource mapping mode includes one of:
Optionally, the transmission parameter is indicated by the base station;
Optionally, the first signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a first field included in downlink control information (DCI), and the first field is configured to indicate the number of times of repetition transmission of the PDSCH;
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the resource mapping mode is method II, and the processor is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, when the base station indicates to skip the PDCCH MO in the first, time interval, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the transceiver is configured to perform:
Optionally, the second signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a second field included in DCI, and the second field is configured to indicate whether to skip the PDCCH MO in the first time interval;
Optionally, the first time interval is a PDSCH transmission time.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission time and a number of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
A downlink channel transmission device is further provided in an embodiment of the present disclosure, including:
A processor-readable storage medium, storing program instructions, where the program instructions are executed by the processor to perform the downlink channel transmission method hereinabove.
The technical solution of the present disclosure at least has the following beneficial effects:
The term “and/or” in the embodiments of the present disclosure describes an association relationship of associated objects, and indicates that three relationships may exist, for example, A and/or B, and may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character “/” generally indicates that the former and latter associated objects are in an “or” relationship.
In the embodiments of the present application, the term “plurality” means two or more, and other terms are similar thereto.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Before the embodiments of the present application are described in detail, the scheduling method is briefly known.
A slot based scheduling mode, i.e., a scheduling mode of 14 OFDM symbols, is supported in the NR. In order to reduce the transmission latency, the NR standard also supports a non-slot based scheduling method, that is, supports micro-slot (mini-slot) scheduling.
Based on the mini-slot scheduling mode, the base station may schedule X (X=2, 4, 7) OFDM symbols. For XR traffic, mini-slot based scheduling will be reused in order to reduce latency. For mini-slot scheduling, the base station configures multiple PDCCH (Physical Downlink Control Channel) MOs (Monitoring Occasions) for the terminal in one slot, and the terminal detects the PDCCH on each PDCCH MO.
In an example of a downlink transmission structure based on a mini-slot, as shown in
In addition, in NR downlink transmission, in order to enlarge coverage and improve reliability, the NR standardizes a slot aggregation technique at Rel-15 stage, that is, one PDCCH can schedule a plurality of continuous slots. The base station configures a number of aggregation slots, PDSCH-aggregation factor=2 or 4 or 8, for the PDSCH by using dedicated RRC signaling, and the base station repeatedly transmits coded bits of one TB (Transport Block) in the PDSCH-aggregation factor slots, where PDSCH transmission resources in each slot are consistent with PDCCH scheduling, that is, the transmission resources in the first slot are repeated. The difference is that the RV (Redundancy Version) of the corresponding PDSCH in each slot may be different.
As shown in
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
It should be noted that, if the base station adopts a slot-based PDSCH scheduling method, the number of times of repetition transmission is the number of PDSCH repetition time slots; when the base station adopts a PDSCH scheduling mode based on min-slot, the repetition transmission times are the PDSCH repetition transmission times.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission and a number L of symbols occupied by each PDSCH transmission.
Optionally, the transmission parameter further include: the start symbol S of the starting time slot of the PDSCH transmission and the number L of the symbols occupied by the PDSCH in one transmission.
It should be noted that, when the base station adopts a PDSCH scheduling method based on min-slot, optionally, L is less than 7, for example, the PDCCH and the PDSCH occupy 2, 4 or 7 OFDM symbols together, that is, exactly one min-slot; the value of L may also be greater than 7 and less than 14, while scenarios where L>14 are not excluded.
Step 202: transmitting first downlink data carried on the PDSCH, according to the transmission parameter.
According to an embodiment of the present disclosure, the transmission parameter of the PDSCH is determined, where the transmission parameter includes: a number of times N of repetition transmission and a repetition transmission mode, where N is greater than or equal to 1 and is a positive integer, and the PDSCH is transmitted according to the transmission parameter, thereby reducing the system overhead and the transmission latency of XR service.
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Specifically, the resource mapping mode includes one of:
Here, the repeated PDSCH specifically refers to a PDSCH transmission greater than once, that is, corresponds to a case where the number of times of repetition transmission N>1; the PDSCH without the qualifier “repeated” specifically refers to the case where the PDSCH is transmitted only once, i.e., corresponding to the number of times of repetition transmission N=1.
Here, when the resource mapping mode is the method I, the PDSCH or the repeated PDSCH may not overlap with the PDCCH MO in the first time interval, and it may be understood that the PDSCH or the repeated PDSCH does not occupy the PDCCH MO in the first time interval. An example is described below.
In a first example, as shown in
In the
The transmission scheme based on the first mode has the advantages that since the total number of symbols transmitted by the PDSCH is N×L, that is, the total number of symbols of repetition transmission in the signaling notification (nominal), repetition transmission performance is ensured, and meanwhile, since the PDSCH skips OFDM symbols occupied by the PDCCH MOs in the current slot or the following slot during transmission, the terminal can continue to detect the PDCCH at the PDCCH MOs, for example, the terminal supporting XR service and eMBB service thereof or URLLC service thereof can be scheduled on the PDCCH MOs in time.
Optionally, the resource mapping mode is method II, and the method further includes:
Here, when the resource mapping mode is method II, the PDSCH or the repeated PDSCH may partially overlap or completely overlap the PDCCH MO in the first time interval, and the PDSCH or the repeated PDSCH may occupy the PDCCH MO in the first time interval.
In a second example, as shown in
In the
However, when a PDSCH needs to be punctured on PDCCH transmission resources allocated in the PDCCH search space in PDCCH transmission symbols, that is, when a PDSCH is transmitted on PDCCH transmission resources occupied by a PDCCH MO, if a PDSCH transmission resource collides with the PDCCH, the PDSCH is punctured, that is, a corresponding PDSCH is deleted, that is, punctured, on the resource where the PDSCH transmission resource collides with the PDCCH.
If the PDSCH transmission is collided with the PDCCH, after the PDSCH is punctured, the number of PDSCH transmission symbols may be less than N×L; it may also be equal to N×L.
It should be noted that due to the puncturing operation, the number of PDSCH transmission symbols in the present disclosure cannot be guaranteed to be N×L, i.e., the total number of symbols of repetition transmission in the signaling notification (nominal) cannot be guaranteed.
The implementation mode has the advantages that the transmission latency of the PDSCH can be reduced without skipping symbols occupied by the PDCCH MO, and meanwhile, the punching operation is adopted for the PDSCH, so that the PDCCH performance is guaranteed not to be lost, other services can be scheduled while XR is transmitted, and the flexibility of the base station is guaranteed.
As another optional implementation mode, the resource mapping mode is a second mode, and the method in the embodiment of the present disclosure further includes:
Here, when PDSCH transmission and PDCCH transmission collide on symbols occupied by the PDCCH MOs, a frequency division multiplexing is performed on the collided PDSCH and PDCCH, which means that PDCCH symbols are occupied when PDSCH transmission resources are mapped, but PDCCH frequency domain resources are not occupied, that is, PDSCH is frequency division multiplexed with PDCCH on symbols occupied by PDCCH, which does not affect the terminal to detect PDCCH on the corresponding PDCCH MO, and does not lose PDSCH performance.
In a third example, as shown in
In the
The terminal does not monitor the PDCCH on the PDCCH MO colliding with the PDSCH.
Here, the number of PDSCH transmission symbols in this scheme may be equal to or less than N×L. N×L is the total number of symbols of repetition transmission in the signaling notification (nominal).
The implementation method has the advantages that for XR services such as cloud games, the latency requirement is high, only mini-slot scheduling can be adopted but the throughput is high, at the moment, the eMB service does not need to be transmitted in the slot transmitted by the PDSCH, PDCCH resources configured in the original min-slot are reserved at the moment, firstly, unnecessary overhead can be caused, and on the other hand, the terminal needs to continuously monitor the PDCCH based on the mini-slot, so that extra power loss is caused. Finally, the direct use of the PDCCH resource for PDSCH transmission is not only beneficial for system performance improvement, but also beneficial for transmission latency reduction, as compared to the example two.
It should be noted that, all three examples above take L<7 as an example, and it can be further described that the base station configures PDSCH repetition transmission parameters, such as a start symbol S and a number of symbols L occupied by one transmission, in the TDRA table by using RRC signaling, and the base station can configure PDSCH repetition transmission times N by using physical layer dynamic signaling or RRC signaling.
The above three examples are all based on the case of min-slot scheduled PDSCH repetition transmission; the basic assumption is that: in order to support the low-latency transmission of the XR service, the base station configures a search space beneficial to mini-slot scheduling by using RRC signaling, that is, multiple PDCCH MOs are configured for the PDCCH search space in one slot, and multiple PDSCH transmission slots can be configured in one configuration period, as shown in
However, the actual scheduling of the base station is flexible, and the base station may adopt mini-slot based scheduling as described in example one, example two, and example three, or may transmit a PDCCH using a certain PDCCH MO in a slot to perform slot based scheduling. No matter the slot-based scheduling or the mini-slot-based scheduling is adopted, the position of the number of the PDCCH MOs corresponding to the search space reconfigured by the base station through the RRC does not change.
For slot-based scheduling, optionally, the method in example three may be adopted, where the base station does not send a PDCCH on the PDCCH MO colliding with the PDSCH; the terminal does not monitor the PDCCH on the PDCCH MO colliding with the PDSCH.
Furthermore, optionally, the base station transmits PDSCH on the resources occupied by the PDCCH MO not for transmitting PDCCH. In one example, as shown in
For slot-based scheduling, similar methods as in example one and example two may also be employed, where symbols occupied in PDSCH transmission do not include symbols occupied by the PDCCH MOs, or symbols occupied in PDSCH transmission include some or all of the symbols occupied by the PDCCH MOs.
It should be noted that the above is the slot-based PDSCH scheduling, and may also include slot-based PDSCH repetition transmission, and the specific method is consistent with the min-slot-based scheduling, which is not described herein again.
Optionally, the transmission parameter is pre-agreed or configured by the base station.
The transmission parameter is configured by a base station; after method step 201 of an embodiment of the present disclosure, the method of an embodiment of the present disclosure further comprises:
Optionally, the high-layer signaling includes: RRC signaling.
Optionally, the physical layer dynamic signaling comprises PDCCH.
Optionally, the indicating, by high-layer signaling and/or physical layer dynamic signaling, the transmission parameter of PDSCH transmission by the terminal includes:
When the repetition transmission type of the PDSCH indicates a first value, for example, PDSCH-repeat-type=A, the base station adopts a slot-based PDSCH scheduling mode, utilizes RRC dedicated signaling to semi-statically configure the number N of repetition time slots of the PDSCH, and the optional base station adopts a Rel-15 slots aggregation method to repeatedly transmit the PDSCH in the N time slots.
At this time, the terminal decodes the corresponding PDSCH according to the number of repeated slots indicated by the physical layer dynamic signaling (e.g., PDCCH).
When the PDSCH repetition transmission type indication is a second value, configuring the number of times of repetition transmission of the PDSCH through a physical layer dynamic signaling; where the PDSCH repetition transmission type indication is configured by the base station through an RRC signaling.
When the PDSCH repetition transmission type indication is a second value, e.g., PDSCH-repetition-type=B, the base station adopts a PDSCH scheduling mode based on min-slot and configures the PDSCH repetition transmission times based on min-slot through the dynamic signaling of a physical layer. And the base station indicates the number of times of repetition transmission of the PDSCH through the dynamic signaling of the physical layer, and sends the PDSCH according to the number of times of repetition transmission of the PDSCH indicated by the DCI.
When the PDSCH repetition transmission type indication is the second value, configuring a mapping type indication of the PDSCH in a nominal repetition time slot through an RRC dedicated signaling;
It should be noted that, when the PDSCH repetition transmission type indication is a second value, for example, PDSCH-repetition-type=B, optionally, the base station may also configure
When the mapping type of the PDSCH in the nominal repetition slot is a third value, for example, PDSCH-repetition-mapping-type=a, the base station configures the number N of PDSCH repetition slots by using a physical layer dynamic signaling (such as PDCCH), where the number of nominal PDSCH repetition transmission slots is equal to the number of actual repetition transmission slots, for example, the transmission resource in the repetition slot is the same as the first slot;
Optionally, the indicating the transmission parameter of the PDSCH to the terminal through the physical layer dynamic signaling includes:
Here, the base station indicates to the terminal through a physical layer dynamic signaling (such as PDCCH) the number N of repetition transmission of the PDSCH, and the base station transmits the corresponding PDSCH in M time slots, where M is less than or equal to N. That is, the number of time slots for PDSCH transmission is less than or equal to the number of times of repetition transmission of PDSCH configured by physical layer dynamic signaling. Namely, the number of the nominal PDSCH repetition transmission slots is less than or equal to the number of the actual repetition transmission slots.
The case that the number of the nominal PDSCH repetition transmission slots is equal to the number of the actual repetition transmission slots is briefly described below.
As shown in
The case that the number of the nominal PDSCH repetition transmission slots is less than the number of actual repetition transmission slots is briefly described below
As shown in
The base station continuously transmits repeated PDSCH on available symbols other than PDCCH from the ending symbol of the first PDSCH, namely the PDSCH mapping mode in the repeated slots is different from the PDSCH mapping mode in the first slots.
Optionally, the number of PDSCH symbols transmitted continuously by the base station is equal to the number of symbols occupied in the initial slot multiplied by the number of times of repetition transmission N (it can be seen from the figure that N=4), i.e., the PDSCH transmits N×L=4×7=28 symbols in total. Optionally, the number of OFDM symbols occupied between the start symbol and the ending symbol of the PDSCH is equal to N×L excluding the number of symbols occupied by the PDCCH.
Here, it is obvious that compared with
Optionally, the indicating explicitly the number of times of repetition transmission of the PDSCH to the terminal through the physical layer dynamic signaling includes:
Here, in other words, there is an explicit field in the DCI to indicate the number of repetition PDSCH transmission.
In another alternative, the indicating implicitly the number of times of repetition transmission of the PDSCH to the terminal through the physical layer dynamic signaling includes:
Optionally, the number of times of repetition transmission of the PDSCH is carried in a TDRA table, and the base station implicitly indicates the number of times of repetition transmission of the PDSCH by a TDRA field carried in the DCI corresponding to a certain row of the TDRA table.
When the base station schedules the PDSCH, if the TDRA field value in the DCI is m, the base station corresponds to m+1 rows of the preset TDRA table. That is, for example, the value of the TDRA field is m, and the number of repetition PDSCH transmission can be indicated by using the TDRA field corresponding to row m+1 of the TDRA table.
In an example, the TDRA table may be as shown in the following table, where K0 represents an offset of the PDSCH with respect to the time slot in which the PDCCH is located, S represents a corresponding start symbol of the PDSCH in the time slot, and L represents a symbol length allocated for the PDSCH in the time slot.
Optionally, the method of the embodiment of the present disclosure further includes:
This step may specifically include:
Optionally, the high-layer signaling includes: RRC signaling.
Optionally, the physical layer dynamic signaling comprises PDCCH.
Here, it is assumed that the high-layer signaling is SkippingMOorNot. If SkippingMOorNot=true indicates that the terminal intends to skip the PDCCH MO in the first time interval, SkippingMOorNot=false indicates that the terminal does not skip the PDCCH MO in the first time interval. The terminal determines whether to monitor the PDCCH on the corresponding MO in the first time interval according to the indication of the base station
Optionally, the indicating to the terminal whether to skip the PDCCH MO in the first time interval through the physical layer dynamic signaling includes:
indicating explicitly or implicitly to the terminal whether to skip the PDCCH MO in the first time interval through the physical layer dynamic signaling.
Optionally, the indicating explicitly to the terminal whether to skip the PDCCH MO in the first time interval through the physical layer dynamic signaling includes:
Here, there is an explicit field in the DCI to indicate PDCCH monitoring within PDSCH repetition transmission resources.
In another optional aspect, the indicating implicitly to the terminal whether to skip the PDCCH MO in the first time interval through the physical layer dynamic signaling includes:
Here, the base station implicitly indicates whether to skip PDCCH monitoring within PDSCH repetition transmission resources by corresponding the TDRA field in the DCI to a certain row or a certain column of the TDRA table.
For example, the base station may add an indication in the downlink TDRA table by using RRC signaling, such as adding a list I in the downlink TDRA. For example, the indication may be 1 bit 0 or 1, the specific meaning of which is shown in the following table.
The base station can flexibly configure whether the terminal needs to monitor the PDCCH according to the service, and one bit can flexibly indicate any number of PDCCH MOs which the terminal needs to skip.
The row index of the downlink TDRA table can be indicated by the downlink TDRA field in the PDCCH. The advantage of this solution is that the base station can flexibly configure whether the terminal needs to monitor the above PDCCH according to the service, and one bit can flexibly indicate any number of PDCCH MOs that the terminal needs to skip.
Optionally, subsequent to the indicating to the terminal whether to skip the PDCCH MO in the first time interval, the method further includes:
Optionally, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the first time interval is a PDSCH transmission time.
It should be noted that the first time interval mentioned in the embodiments of the present disclosure is a PDSCH or PDSCH repetition transmission time.
It should be noted that, when the terminal is instructed to skip a PDCCH MO in the first time interval and a PDCCH MO where DCI for scheduling the current PDSCH is located in the first time interval, the skipped PDCCH MO does not include the PDCCH MO where DCI for scheduling the PDSCH is located; that is, the PDCCH MO in which the DCI for the scheduled PDSCH is located is excluded, that is, the PDCCH MO is not counted as one of the PDCCH MOs that the terminal needs to skip.
According to the downlink channel transmission method in the embodiment of the present disclosure, the transmission parameter of the PDSCH is determined, where the transmission parameter includes: a number of times N of repetition transmission and a repetition transmission mode, where N is greater than or equal to 1 and is a positive integer, and the PDSCH is transmitted according to the transmission parameter, thereby reducing the system overhead and the transmission latency of XR service.
As shown in
In this step, when the number of times of repetition transmission N=1, it is indicated that the base station performs PDSCH transmission only once.
Optionally, the transmission parameter further includes a start symbol S of a start time slot of the PDSCH transmission and a number N of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
It should be noted that, if the base station adopts a slot-based PDSCH scheduling method, the number of times of repetition transmission is the number of PDSCH repetition time slots; when the base station adopts a PDSCH scheduling mode based on min-slot, the repetition transmission times are the PDSCH repetition transmission times.
According to an embodiment of the present disclosure, the transmission parameter of the PDSCH is obtained, where the transmission parameter includes: a number of times N of repetition transmission and a repetition transmission mode, where N is greater than or equal to 1 and is a positive integer, and the PDSCH is transmitted according to the transmission parameter, thereby reducing the system overhead and the transmission latency of XR service.
Optionally, the transmission parameter is pre-agreed or indicated by the base station.
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Specifically, the resource mapping mode includes one of:
Here, the repeated PDSCH specifically refers to more than one PDSCH transmission, that is, corresponds to a case where the number of times of repetition transmission N>1; the PDSCH without the qualifier “repeated” specifically refers to the case where the PDSCH is transmitted only once, i.e., corresponding to the number of times of repetition transmission N=1.
Optionally, the transmission parameter is indicated by a base station; the method steps 1001 of the embodiment of the present disclosure may specifically include:
Further, the first signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a first field included in downlink control information (DCI), and the first field is configured to indicate the number of times of repetition transmission of the PDSCH;
Optionally, the method of the embodiment of the present disclosure may further include:
Optionally, the resource mapping mode is method II, and the method further includes:
when the PDSCH transmission and a PDCCH transmission collide on the symbols occupied by the PDCCH MO, monitoring the PDCCH on other PDCCH MOs than the symbols occupied by the collided PDCCH MO.
Here, when the PDSCH transmission and a PDCCH transmission collide on the symbols occupied by the PDCCH MO and a frequency division multiplexing is performed on the PDSCH and the PDCCH which are collided, the PDCCH symbols are occupied but PDCCH frequency domain resources are not occupied when PDSCH transmission resource mapping is performed, that is, PDSCH is frequency division multiplexed with PDCCH on PDCCH occupied symbols, which does not affect the detection of PDCCH by the terminal on the corresponding PDCCH MO and does not lose PDSCH performance.
When the PDSCH transmission and a PDCCH transmission collide on the symbols occupied by the PDCCH MO, monitoring the PDCCH on other PDCCH MOs than the symbols occupied by the collided PDCCH MO, that means the terminal does not monitor the PDCCH on the PDCCH MOs in collision with the PDSCH.
Optionally, the method of the embodiment of the present disclosure may further include:
Optionally, when the base station indicates to skip the PDCCH MO in the first time interval, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the determining, by the base station, whether to skip the PDCCH MO in the first time interval includes:
Optionally, the second signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a second field included in DCI, and the second field is configured to indicate whether to skip the PDCCH MO in the first time interval;
Optionally, the first time interval is a PDSCH transmission time.
It should be noted that the first time interval mentioned in the embodiments of the present disclosure is a PDSCH or PDSCH repetition transmission time.
It should be noted that, when the terminal is instructed to skip a PDCCH MO in the first time interval and a PDCCH MO where DCI for scheduling the current PDSCH is located in the first time interval, the skipped PDCCH MO does not include the PDCCH MO where DO for scheduling the PDSCH is located; that is, the PDCCH MO in which the DCI for the scheduled PDSCH is located is excluded, that is, the PDCCH MO is not counted as one of the PDCCH MOs that the terminal needs to skip.
According to the downlink channel transmission method in the embodiment of the present disclosure, the transmission parameter of the PDSCH is obtained, where the transmission parameter includes: a number of times N of repetition transmission and a repetition transmission mode, where N is greater than or equal to 1 and is a positive integer, and the PDSCH is transmitted according to the transmission parameter, thereby reducing the system overhead and the transmission latency of XR service.
As shown in
In
The processor 1110 may be a Central Processing Unit (CPU), an Application Specific integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Optionally, the resource mapping mode includes one of:
Optionally, the resource mapping mode is two, and the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the resource mapping mode is method II, and the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the transmission parameter is pre-agreed, or configured by a base station.
Optionally, the transmission parameter is configured by the base station;
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1110 is configured to read the program instructions in the memory to perform:
Optionally, the processor is configured to read the program instructions in the memory to perform:
Optionally, the transceiver is configured to perform:
Optionally, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the first time interval is a PDSCH transmission time.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission time and a number of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
According to the downlink channel transmission device in the embodiment of the present disclosure, where the transmission parameter includes: a number of times N of repetition transmission and a repetition transmission mode, where N is greater than or equal to 1 and is a positive integer, and the PDSCH is transmitted according to the transmission parameter, thereby reducing the system overhead and the transmission latency of XR service.
It should be noted that the apparatus provided in the embodiment of the present disclosure can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated herein.
As shown in
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Optionally, the resource mapping mode includes one of:
Optionally, the resource mapping mode is method II, and the device further includes:
Optionally, the resource mapping mode is method II, and the device further includes:
Optionally, the transmission parameter is pre-agreed, or configured by a base station.
Optionally, the transmission parameter is configured by the base station;
Optionally, the first indicating module includes:
Optionally, the first indicating module further includes:
Optionally, the first indicating unit is further configured to:
Optionally, the first indicating unit is further configured to:
Optionally, the device further includes:
Optionally, the second indicating module includes:
Optionally, the first indicating sub-module includes:
Optionally, the second indicating sub-module is configured to:
Optionally, the second indicating sub-module is configured to:
Optionally, the device further includes a second transmitting module configured to:
Optionally, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the first time interval is a PDSCH transmission time.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission and a number of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
According to the downlink channel transmission device in the embodiment of the present disclosure, the transmission parameter of the PDSCH is determined, where the transmission parameter includes: a number of times N of repetition transmission and a repetition transmission mode, where N is greater than or equal to 1 and is a positive integer, and the PDSCH is transmitted according to the transmission parameter, thereby reducing the system overhead and the transmission latency of XR service.
It should be noted that, in the embodiment of the present application, the division of the unit is schematic, and is only one logic function division, when the actual implementation is realized, another division mode may be provided. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solutions of the present application, which are essential or contributing to the prior art, or all or part of the technical solutions may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
It should be noted that the apparatus provided in the embodiment of the present disclosure can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated herein.
In some embodiments of the present disclosure, there is also provided a processor-readable storage medium storing program program for causing the processor to perform steps of:
When executed by the processor, the program instructions may implement all the implementation modes applied in the embodiment of the method at the base station side shown in
As shown in
In
The processor 1310 is responsible for managing the bus architecture and general processing, and the memory 1320 may store data used by the processor 1310 in performing operations.
Alternatively, the processor 1310 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device), and the processor 1310 may also have a multi-core architecture.
The processor 1310 is configured to execute any of the methods provided by the embodiments of the present application by calling the program instructions stored in the memory according to the obtained executable instructions. The processor 1310 and the memory 1320 may also be physically disposed separately.
Optionally, the transmission parameter is pre-agreed or indicated by the base station.
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Optionally, the resource mapping mode includes one of:
Optionally, the transmission parameter is indicated by the base station;
Optionally, the first signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a first field included in downlink control information (DCI), and the first field is configured to indicate the number of times of repetition transmission of the PDSCH;
Optionally, the processor 1310 is configured to read the program instructions in the memory to perform:
Optionally, the resource mapping mode is method II, and the processor 1310 is configured to read the program instructions in the memory to perform:
Optionally, the processor 1310 is configured to read the program instructions in the memory to perform:
Optionally, when the base station indicates to skip the PDCCH MO in the first time interval, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the transceiver 1300 is configured to perform:
Optionally, the second signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a second field included in DCI, and the second field is configured to indicate whether to skip the PDCCH MO in the first time interval;
Optionally, the first time interval is a PDSCH-transmission time.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission time and a number of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
According to the downlink channel transmission device in the embodiment of the present disclosure, the transmission parameter of the PDSCH is obtained, where the transmission parameter includes: a number of times N of repetition transmission and a repetition transmission mode, where N is greater than or equal to 1 and is a positive integer, and the PDSCH is transmitted according to the transmission parameter, thereby reducing the system overhead and the transmission latency of XR service.
It should be noted that the apparatus provided in the embodiment of the present disclosure can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated herein.
As shown in
Optionally, the transmission parameter is pre-agreed, or indicated by a base station.
Optionally, the repetition transmission mode is a resource mapping mode between a PDSCH repetition transmission and a physical downlink control channel monitoring occasion (PDCCH MO).
Optionally, the resource mapping mode includes one of:
Optionally, the transmission parameter is indicated by the base station;
Optionally, the first signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a first field included in downlink control information (DCI), and the first field is configured to indicate the number of times of repetition transmission of the PDSCH;
Optionally, the device further includes:
Optionally, the resource mapping mode is method II, and the device further includes:
Optionally, the device further includes:
Optionally, when the base station indicates to skip the PDCCH MO in the first time interval, the skipped PDCCH MO is an MO corresponding to a search space corresponding to a PDCCH scheduling a current PDSCH.
Optionally, the determining module includes:
Optionally, the second signaling is the physical layer dynamic signaling;
Optionally, the explicit indication of the physical layer dynamic signaling is a second field included in DCI, and the second field is configured to indicate whether to skip the PDCCH MO in the first time interval;
Optionally, the first time interval is a PDSCH transmission time.
Optionally, the transmission parameter further includes a start symbol of a start time slot of the PDSCH transmission time and a number of symbols occupied by each PDSCH transmission.
Optionally, the number of times of repetition transmission is a number of times of PDSCH repetition transmission or a number of PDSCH repetition slots.
According to the downlink channel transmission device in the embodiment of the present disclosure, the transmission parameter of the PDSCH is obtained, where the transmission parameter includes: a number of times N of repetition transmission and a repetition transmission mode, where N is greater than or equal to 1 and is a positive integer, and the PDSCH is transmitted according to the transmission parameter, thereby reducing the system overhead and the transmission latency of XR service.
It should be noted that, in the embodiment of the present application, the division of the unit is schematic, and is only one logic function division, when the actual implementation is realized, another division mode may be provided. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solutions of the present application, which are essential or contributing to the prior art, or all or part of the technical solutions may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
It should be noted that the apparatus provided in the embodiment of the present disclosure can implement all the method steps implemented by the method embodiment, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated herein.
In some embodiments of the present disclosure, a processor-readable storage medium, storing program instructions, where the program instructions are executed by the processor to perform:
When executed by the processor, the program instructions may implement all the implementation modes in the embodiment of the method applied to the terminal side shown in
The technical scheme provided by the embodiment of the application can be suitable for various systems, especially 5G systems. For example, the applicable System may be a Global System for Mobile communication (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (General Packet Radio Service, GPRS) System, a Long Terni Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD) System, a Long Term Evolution (Long Term Evolution, LIE-a) System, a Universal Mobile telecommunications System (Universal Mobile telecommunications System, UMTS), a Universal Internet Access (WiMAX) System, a New wireless Access (WiMAX) System, a New Radio network (NR 5, New NR) System, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5 GS), and the like.
The terminal device referred to in the embodiments of the present application may be a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be referred to as a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile telephone (or “cellular” telephone) and a computer having a mobile terminal device, e.g., a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN), and may exchange language and/or data with the Radio Access Network. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an access point (access point), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), and a user device Fuser device which is not limited in this embodiment.
The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for serving a terminal. A base station may also be called an access point, or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames and Internet Protocol (IP) packets with one another as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communications network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), may be a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), may be an evolved Node B (eNB or e-NodeB) in a Long Term Evolution (LTE) System, may be a 5G Base Station (gNB) in a 5G network architecture (next generation System), may be a Home evolved Node B (Home Node B, HeNB), a relay Node (relay Node), a Home Base Station (femto), a pica Base Station (pico) and the like, and is not limited in the embodiments of the present application. In some network configurations, a network device may include Centralized Unit (CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.
Multiple Input Multiple Output (MIMO) transmission may be performed between the network device and the terminal device by using one or more antennas, where the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-User MIMO (MU-MIMO). According to the form and the number of the root antenna combination, the MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, and can also be diversity transmission, precoding transmission, beamforming transmission, etc.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
It is to be understood that the embodiments described in this disclosure may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the modules, units, sub-modules, sub-units, etc. may be implemented in one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular mode, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202010855582.7 | Aug 2020 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/113757 | 8/20/2021 | WO |
