CN111713055A - Apparatus and method for sending data packets in a communication network - Google Patents

Abstract

Apparatus and method for transmitting data packets in a communication network. The present invention relates to a transmitter (601) for transmitting data packets to a receiver (631), particularly transmitting data packets according to a Hybrid Automatic Repeat Request (HARQ) scheme or a blind repeat scheme. The transmitter (601) includes a communication interface (603) for transmitting data packets, and a processor (605) for determining a first transmission multiplexing scheme for transmitting data packets in a first transmission, and determining a second transmission multiplexing scheme for transmitting data packets in a second transmission, wherein the block error rate associated with the first transmission multiplexing scheme is higher than the block error rate associated with the second transmission multiplexing scheme, and the first and second transmissions are time-separated.

Description

Apparatus and method for sending data packets in a communication network

technical field

The present invention generally relates to mobile communications. More particularly, the present invention relates to transmitters and receivers and corresponding methods for transmitting data packets in a mobile communication network.

Background technique

Ultra-reliable low latency communication (uRLLC) is one of the key requirements for 5G new radio (NR) technology for vehicle communication, industrial automation, etc., as shown in the table in Figure 1 It is shown that in these applications, the transmission of small data requires a low latency of 1 ms and a fairly high reliability of 99.999%.

Spectrally inefficient low modulation and coding rates are critical to meet the challenging uRLLC reliability requirements, which ultimately require more bandwidth and thus limit the user equipment (UE) per cell uRLLC connection. Meeting uRLLC requirements at high cell load is a challenging task due to the increased queuing delay, where the total delay includes queuing delay, transmit time, processing time at the receiver, and N-1 times HARQ (Hybrid Automatic retransmission request), where N is the total number of transmissions.

Furthermore, as shown in Figure 2, 5G NR should be designed to support multiple services simultaneously and take into account scalable key performance indicators (KPIs) across various verticals.

In the current standardization of 5G NRRAN1, many methods for coexisting enhanced mobile broadband (eMBB) and uRLLC have been studied: In the first method of dynamic resource sharing between uRLLC and eMBB, it is agreed that in the non-overlapping The resources for eMBB and uRLLC are scheduled respectively on the time/frequency resources of . Therefore, the realization of the dynamic resource sharing scheme is very similar to the existing user scheduling method, which mainly relies on the base station scheduler.

In the second semi-static partitioning method of eMBB and uRLLC resources, where resources are partitioned in time or frequency through RRC signaling based on load conditions is also considered.

In a third approach, a preemption based approach is considered in the case shown in Figure 3, in which case when resources are already scheduled for the ongoing downlink eMBB data transmission 301, a uRLLC transmission 303 for minislots. In the preemption method, once a uRLLC data packet arrives, part of the resources allocated for eMBB data will be punctured and reallocated to the UE for uRLLC transmission. A post-indication message about the affected resource is sent to the eMBB UE to avoid soft buffer contamination to HARQ, and subsequent transmissions from the next generation node B (gNB) schedule the affected resource immediately without waiting for feedback.

The main focus of current standardization is how the eMBB UE reads the preemption indication to avoid soft buffer contamination for HARQ transmissions. However, the main disadvantage of the preemption scheme is that the reliability of the eMBB will be affected, and the retransmission timing required to recover from the preemption impact will affect the overall spectral efficiency. After the uRLLC transmission is completed, eMBB transmission can be resumed. In this case, the delay of eMBB transmission will increase.

In the 5G NR standard, various options are proposed for uRLLC transmission, such as a single uRLLC transmission, to achieve strict reliability and latency without attempting HARQ transmission, which requires higher bandwidth. The second approach involves L (L>1) repetition-based uRLLC transmissions without feedback acknowledgement (ACK) or negative acknowledgement (NACK) to achieve the desired block error rate (BLER) target, Among them, subsequent repetitions for the same transport block (TB) can be dynamically changed, such as transmit power or resource allocation. For details about this method, see "Enhancing the Reliability of License-Free Transmission" published by Huawei at the RAN1-AH-1801 conference.

A third approach based on HARQ-based adaptive transmission with multiple channel quality indicator (CQI) reports is based on flexible BLER target configuration. Therefore, for the initial transmission process, a relaxed modulation coding scheme (MCS) with a BLER of 10% is selected, and the data is retransmitted using a stricter BLER target and a strict or lower MCS scheme. More details on the third method can be found in "MCS/CQI Design for uRLLC Transmission" presented by Huawei at the RAN1-AH-1801 conference.

Depending on the application, the reliability required for uRLLC services can be as high as 99.999% within a certain delay range. Due to the low code rate used, in order to meet the above requirements, the resources required to transmit uRLLC data packets are usually higher than those required by eMBB.

A non-orthogonal transmission scheme can be applied to both eMBB and uRLLC intra-UE multiplexing and/or inter-UE multiplexing, according to which the same time/frequency resources are reused. Several non-orthogonal schemes are proposed. These non-orthogonal schemes mainly combine code-based multiplexing and power-based multiplexing on top of the orthogonal scheduling method. Such transmission schemes include, for example, superposition transmission based on multi-user superposition technique (MUST), sparse code multiple access (SCMA), resource spread multiple access (RSMA), and the like. More details on non-orthogonal transmission schemes can be found in Huawei's "Discussion on Grant-Based UL Multiplexing for eMBB and URLLC" presented at the RAN1-NR#2 conference and China Communications Vol.13, Supplement 2016 Found in "5G Non-Orthogonal Multiple Access Analysis" in Issue 2.

For the case of multiplexing within the UE, when the uRLLC transmission is triggered, the user has an ongoing eMBB transmission, and the user can reuse the eMBB resources for urgent uRLLC transmission. If eMBB resources are reused for uRLLC transmission, part of the resources of eMBB and uRLLC will be simultaneously in time domain and frequency domain by non-orthogonal multiple access (NOMA) technology (a superposition technology) overlap to provide the required spectral efficiency. The reliability of NOMA depends on high signal-to-noise ratio (SNR) channel conditions, the algorithm complexity of the receiver, and the like.

On the other hand, in the case of rich multipath environments, spatial multiplexing can be an option to solve the coexistence problem of eMBB and uRLLC by mapping eMBB and uRLLC services into different MIMO layers. In the coexistence area of eMBB and uRLLC, the eMBB service may be transmitted using the default transmitter scheme (eg, SISO or 2x2MIMO) configured by the base station. As shown in Figure 4, once the uRLLC stray data arrives, an additional MIMO layer is added to spatially multiplex the uRLLC data with the eMBB data.

Spatial multiplexing is particularly suitable for use in situations such as indoor industrial automation, or vehicle-to-vehicle (V2V) communications, where the benefits of spatial multiplexing in rich multipath environments can be realized. The widely spaced antennas on the vehicle allow for very low coherence between these antennas, which is key to reducing interference to the receiver. Applicable scenarios may be downlink communication and sidelink communication. Spatial diversity techniques can also be applied together with spatial multiplexing to enhance the overall signal-to-noise ratio, while the reliability performance of uRLLC services can be further enhanced by closed-loop MIMO precoding techniques with weighting for uRLLC transmissions Feature vector.

Although the non-orthogonal multiplexing transmission scheme and the spatial multiplexing transmission scheme provide the high spectral efficiency required for the coexistence of uRLLC and eMBB, it is still a problem to meet the reliability requirements of uRLLC within a specific delay range. For intra-UE multiplexing, the channel conditions of uRLLC/eMBB remain the same and the limitation of the channel capacity of the same UE also applies, which also remains the same at the initial stage for any other NOMA scheme.

The target of the traditional adaptive HARQ mechanism of LTE is 10% BLER of the initial transmission, and the retransmission needs to correct the errors caused by the channel defects in the link adaptation. As shown in Figure 5, the allocated resource blocks are allowed to change along with the redundancy version (RV). However, radio resources according to the conventional adaptive HARQ mechanism are not effectively utilized. Therefore, in the coexistence of uRLLC and eMBB, efficiently provisioning resources and meeting the reliability requirements of uRLLC services are the main challenges of 5G NR design.

In view of this, there is a need for improved apparatus and methods to allow data packets to be transmitted in a mobile communication network in an efficient and reliable manner.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an improved apparatus and method enabling efficient and/or reliable transmission of data in a mobile communication network.

The foregoing and other objects are achieved by the subject-matter of the independent claims. Other embodiments will be apparent from the dependent claims, the description, and the drawings.

Generally, the present invention relates to transmitters and receivers and corresponding methods of transmitting data packets in a mobile communication network. More specifically, transmitters and receivers according to embodiments may use resource efficient transmission techniques to improve overall spectral efficiency and increase average cell throughput for coexistence of eMBB data and uRLLC data in 5G mobile networks.

In addition, the embodiments of the present disclosure apply both HARQ-free transmission and/or HARQ-based adaptive transmission. HARQ-free transmission is a dynamic transmission multiplexing scheme based on blind repetition. The coexistence effects of uRLLC and eMBB under different schemes and reliability objectives. Therefore, the embodiments of the present invention can achieve high uRLLC reliability in a resource-efficient manner within the HARQ delay range by avoiding over-supply of resources and increasing the system capacity of uRLLC users.

More specifically, according to a first aspect, the present invention relates to a transmitter for transmitting data packets to a receiver, in particular according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme, wherein the transmitter including a communication interface for sending data packets, the processor for determining a first transmission multiplexing scheme for sending data packets in a first transmission, and a processor for determining a first transmission multiplexing scheme for sending data packets in a second transmission a second transmit multiplexing scheme, wherein the multiplexing scheme includes multiplexing of at least two different services, and the block error rate associated with the first transmit multiplexing scheme is higher than the block error rate associated with the second transmit multiplexing scheme, and wherein The first transmission is separated in time from the second transmission. The at least two different services include eMBB transport blocks and uRLLC transport blocks with different reliability targets.

In addition, the multiplexing scheme may be a scheme of multiplexing at least two orthogonal signals or non-orthogonal signals, wherein the non-orthogonal multiplexing includes spatial multiplexing or non-orthogonal multiple access multiplexing (non-orthogonal multiple access multiplexing, NOMAmultiplexing). Other multiplexing schemes include eg eMBB preemption based methods or dynamic scheduling.

Accordingly, an improved transmitter is provided that allows data packets to be sent to a receiver in an efficient and reliable manner.

In another possible implementation of the first aspect, the communication interface is configured to receive a retransmission request after sending the data packet in the first transmission, wherein the request is used to retransmit the data packet; the processor is configured to receive the retransmission after receiving the retransmission request. Upon request, a second multiplexing scheme is determined based on reliability goals.

In this case, the second transmission is the retransmission requested by the retransmission request.

In another possible implementation of the first aspect, the processor is configured to determine the second multiplexing scheme after a predetermined time interval after the determination of the first transmission multiplexing scheme expires, and/or the communication interface is configured to transmit the multiplexing scheme in the first transmission The data packet is retransmitted in the second transmission after the expiration of the subsequent predetermined time interval.

The predetermined time interval may be a parameter from the autonomous HARQ transmission scheme.

In another possible implementation of the first aspect, the data packet includes a first data packet part and a second data packet part, wherein the first data packet part of the data packet requires higher reliability and higher reliability than the second data packet part / or lower latency.

In another possible implementation of the first aspect, the first data packet part is associated with a data transmission service, in particular a uRLLC service, wherein the data transmission service may also include a requested transport block from the MAC layer, and the processing The transmitter is used to determine a corresponding transmit multiplexing scheme that satisfies the block error rate requirements associated with the data transmit service.

Therefore, an appropriate transmission method can be selected based on the reliability requirements of the data transmission service (especially the uRLLC service) to meet the requirements of uRLLC data transmission.

In another possible implementation of the first aspect, the second data packet part is associated with another data transmission service, in particular an eMBB service for data transmission.

In another possible implementation of the first aspect, the first transmission multiplexing scheme is associated with transmission according to the first transmission scheme, and the second transmission multiplexing scheme is associated with transmission according to the second transmission scheme.

In another possible implementation of the first aspect, the first transmission scheme and the second transmission scheme include at least one of the following schemes: superimposing the first data packet part and the second data packet part, in particular, for example, a non-orthogonal multiple address (NOMA) superposition-based transmission method, and/or spatial multiplexing, coding scheme, modulation, preemption, puncturing, or scheduling, where the second transmission scheme is different from the first transmission scheme.

In another possible implementation of the first aspect, the first transmission multiplexing scheme provides higher spectral efficiency than the second transmission multiplexing scheme.

The transmitter's processor can first utilize a superposition of uRLLC and eMBB for initial transmission (e.g., by using NOMA or spatial multiplexing) to conserve resources, and can then apply robust transmission methods such as orthogonal frequency-division multiplexing (orthogonal frequency-multiplexing) division multiplexing, OFDM) scheme to ensure higher reliability during retransmission. Therefore, flexibility and reliability goals are discussed together along with transmission multiplexing schemes such as NOMA, spatial multiplexing, or orthogonal scheduling methods.

In another possible implementation of the first aspect, the processor is further configured to determine a corresponding transmission multiplexing scheme for retransmitting the data packets based on channel conditions between the transmitter and the receiver.

In another possible implementation of the first aspect, the communication interface is further configured to signal the corresponding transmit multiplexing scheme to the receiver, in particular to signal the corresponding transmit multiplexing scheme in the control information, wherein the corresponding The transmission multiplexing scheme of includes information indicating the corresponding transmission scheme.

In another possible implementation of the first aspect, the communication interface is further configured to transmit data packets to the receiver using a predetermined transmission multiplexing scheme.

In another possible implementation of the first aspect, the communication interface is further configured to send a reconfiguration message to the receiver, wherein the reconfiguration message indicates to send one or more predetermined sets of multiplexing schemes, the sending multiplexing scheme Associated with a redundancy version and/or a transmission number; the one or more predetermined sets are signaled to the receiver in the reconfiguration message, wherein the control information performs dynamic activation of one of the above-mentioned one or more predetermined sets .

In another possible implementation of the first aspect, the communication interface of the transmitter is further configured to send a reconfiguration message to the receiver, wherein the reconfiguration message indicates to change from sending data packets using a predetermined sending multiplexing scheme to using corresponding sending a multiplexing scheme to transmit the data packets; and signaling a corresponding transmit multiplexing scheme to the receiver, in particular by means of control information, wherein the respective transmit multiplexing scheme includes information indicative of the corresponding transmit scheme .

According to a second aspect, the present invention relates to a method of sending data packets to a receiver, in particular according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme. The method includes the steps of: determining a first transmit multiplexer for transmitting data packets in a first transmission; using a first transmit multiplexing scheme to transmit data packets in the first transmission; determining a first transmit multiplexer for transmitting in a second transmission a second transmission multiplexing scheme for data packets, wherein the block error rate associated with the first transmission multiplexing scheme is higher than the block error rate associated with the second transmission multiplexing scheme; and using the second transmission multiplexing scheme to send in a second transmission A data packet in which the first transmission and the second transmission are separated in time.

The above method may be implemented using a transmitter according to the first aspect.

Therefore, an improved method is provided that allows data packets to be sent to receivers in an efficient and reliable manner.

According to a third aspect, the present invention relates to a receiver for receiving data packets from a transmitter, in particular data packets sent according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme. The receiver includes a communication interface and a processor. The communication interface is used to receive data packets according to a first transmit multiplexing scheme in a first transmission and to receive data packets according to a second transmit multiplexing scheme in a second transmission, wherein the first transmission and the second transmission are separated in time . The processor is configured to decode the received data packets according to the first transmission multiplexing scheme, and decode the received data packets according to the second transmission multiplexing scheme, wherein the block error rate associated with the first transmission multiplexing scheme is high The block error rate associated with the second transmission multiplexing scheme.

Accordingly, an improved receiver is provided that allows data packets to be received from a transmitter, such as a base station, in an efficient and reliable manner.

According to a fourth aspect, the present invention relates to a method of receiving data packets from a transmitter, in particular receiving data packets according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme. The method includes: receiving data packets according to a first transmission multiplexing scheme in a first transmission; decoding the received data packets according to the first transmission multiplexing scheme; receiving data packets according to the second transmission multiplexing scheme in a second transmission, wherein the first transmission and the second transmission are separated in time; and the received data packets are decoded according to the second transmission multiplexing scheme, wherein the block error rate associated with the first transmission multiplexing scheme is higher than that associated with the second transmission multiplexing scheme block error rate.

The above method may be implemented using a receiver (such as a user entity or terminal) according to the third aspect.

Accordingly, an improved method is provided that allows data packets to be received from a transmitter, such as a base station, in an efficient and reliable manner.

According to a fifth aspect, the present invention relates to a computer program product comprising program code which, when run on a computer, performs a method according to the second or fourth aspect.

The present invention can be implemented in hardware and/or software.

Description of drawings

Other embodiments of the present invention will be described with reference to the following figures, in which:

Figure 1 shows a table summarizing the latency and reliability requirements for different uRLLC scenarios defined in the 3GPP TR22.862 specification;

Figure 2 shows a schematic diagram of hybrid service support for vertical industries in a 5G network;

Figure 3 shows a schematic diagram of a 5G NR frame structure;

4 shows a schematic diagram of spatial multiplexing of uRLLC data and eMBB data;

5 shows a schematic diagram of the content of control information according to an adaptive HARQ scheme;

Figure 6 shows a schematic diagram of a cellular communication network according to an embodiment;

7 shows a schematic diagram of adaptive transmission based on flexible reliability requirements according to an embodiment;

FIG. 8 shows a schematic diagram of adaptive transmission based on flexible reliability requirements according to an embodiment;

9 shows a schematic diagram of an adaptive transmission method based on flexible reliability requirements according to an embodiment;

10 shows a schematic diagram of adaptive transmission for coexistence of uRLLC and eMBB according to an embodiment;

11 shows a schematic diagram of an exemplary frame structure for multiplexing uRLLC and eMBB transmissions according to an embodiment;

12 shows a schematic diagram of adaptive transmission for coexistence of uRLLC and eMBB according to an embodiment;

13 is a schematic diagram showing the content of control information according to a flexible adaptive HARQ scheme;

Figure 14 shows a schematic diagram of an exemplary signaling process according to an embodiment;

Figure 15 shows a schematic diagram of an exemplary frame structure for pre-indication according to an embodiment;

FIG. 16 shows a schematic diagram of a transmission method according to an embodiment; and

FIG. 17 shows a schematic diagram of a receiving method according to an embodiment.

In different drawings, the same reference numbers are used for the same or at least functionally equivalent features.

Detailed ways

The following description refers to the accompanying drawings, which form a part of this disclosure, and in which specific aspects of the invention may be shown by way of illustration. It is to be understood that other aspects may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Since the scope of the invention is defined by the appended claims, the following detailed description should not be considered limiting.

For example, it should be understood that what is disclosed in relation to a method described may also apply to a corresponding device or system for performing the method, and vice versa. For example, if particular method steps are described, the corresponding apparatus may include means for performing the described method steps, even if such means are not explicitly described or shown in the figures.

Furthermore, in the following detailed description and claims, embodiments with different functional blocks or processing units are described, and these different functional blocks or processing units are connected to each other or exchange signals with each other. It should be understood that the present invention also covers embodiments comprising additional functional blocks or processing units arranged between the functional blocks or processing units of the embodiments described below.

Finally, it should be understood that the features of the various exemplary aspects described herein may be combined with each other unless expressly stated otherwise.

In order to improve data transmission in the case of coexistence of uRLLC and eMBB, for the multiplexing of uRLLC and eMBB data within the UE, a transmitter such as a base station in this embodiment of the present invention may use an enhanced flexible transmission scheme, and may transmit on a per-transmission basis The individual reliability targets of the uRLLC transmission and/or the dynamic channel conditions between the transmitter and receiver (eg user entities or terminals) when attempting to change the transmission multiplexing of the uRLLC in the coexistence area. In the following embodiments, more details regarding the enhanced transmission scheme will be discussed further with reference to Figures 7 to 9 .

Figure 6 shows a schematic diagram of a cellular communication network 600 comprising a transmitter 601 according to an embodiment and a receiver 631 according to an embodiment, wherein the transmitter 601 is used to transmit data in the cellular communication network 600 The packets, in particular the data packets are transmitted according to a hybrid automatic repeat request (HARQ) scheme or a blind repeat scheme, and the receiver 631 is used to receive the data packets.

In an exemplary embodiment, the transmitter 601 may be implemented in a base station, in particular a next generation Node B in a 5G network, and the receiver 631 may be, for example, a user entity, a mobile phone, a terminal, or a vehicle.

Additionally, the data packet may include a first portion and a second portion, wherein the first portion of the data packet requires higher reliability and/or lower latency than the second portion of the data packet. For example, the first data packet part is related to the uRLLC data transmission service, and the second data packet part is related to the eMBB data transmission service. The data transmission service may include, for example, transport blocks.

It can be seen from FIG. 6 that the transmitter 601 includes a communication interface 603 and a processor 605, the communication interface 603 is used for sending data packets, and the processor 605 is used for determining a transmission multiplexing scheme for sending data packets.

Similar to the transmitter 601, the receiver 631 also includes a communication interface 633 for receiving data packets and a processor 635 for decoding the received data packets. Further embodiments of transmitter 601 and receiver 631 will be described below with reference to Figure 7, where several adaptive transmissions based on different reliability objectives are shown.

According to an embodiment, the processor 605 is configured to determine a first transmit multiplexing scheme for sending data packets in the first transmission 701 and the communication interface 603 is configured to receive a retransmission request after sending the data packets in the first transmission 701 .

Upon receiving the retransmission request, the processor 605 is configured to determine a second multiplexing scheme for transmitting data packets in the second transmission 702, wherein the block error rate associated with the first transmitting multiplexing scheme is higher than that of the second transmitting multiplexing scheme The associated block error rate is higher (ie, the reliability requirements are lower).

Optionally, the processor 605 may be further configured to determine the second multiplexing scheme after the expiration of a predetermined time interval after the first transmission multiplexing scheme is determined, and/or the communication interface 603 may be configured to determine the second multiplexing scheme after the first transmission 701. After the time interval expires, the packet is retransmitted in a second transmission with a higher reliability target. The predetermined time interval may be a parameter from the autonomous HARQ transmission scheme.

The processor 605 is configured to determine a corresponding transmission multiplexing scheme that satisfies the block error rate requirement associated with the data transmission service. In another embodiment, the processor 605 may also determine a corresponding transmit multiplexing scheme for retransmitting the data packets based on the channel conditions between the transmitter 601 and the receiver 631 .

After the transmitter 601 transmits the data packets, the communication interface 633 of the receiver 631 is used to receive the data packets, and the processor 635 of the receiver 631 is used to decode the received data packets according to the corresponding transmission multiplexing scheme.

In an embodiment, the first transmit multiplexing scheme is associated with transmissions according to the first transmission scheme and the second transmit multiplexing scheme is associated with transmissions according to the second transmission scheme. In particular, the first transmission scheme may provide higher spectral efficiency than the second transmission scheme.

As can be seen from FIG. 7, the block error rate when the first transmission 701 is performed is higher than that of the second transmission 702 (ie, has lower reliability requirements), therefore, the transmitter 601 can determine for the first transmission 701 to provide high Spectrally efficient transmission scheme. For example, a transmitter 601 according to an embodiment may first utilize the overlap of uRLLC and eMBB for initial transmission 701 (eg NOMA, spatial multiplexing) to save resources, and then use a robust transmission method such as Orthogonal Frequency Division Multiplexing (OFDM) ) scheme to ensure higher reliability during retransmissions.

By way of illustration and not limitation, the first transmission scheme may include at least one of overlapping the first data packet portion with the second data packet portion, particularly overlay-based transmission such as Non-Orthogonal Multiple Access (NOMA) Methods, and/or spatial multiplexing, the second transmission scheme is different from the first transmission scheme and may include, for example, Orthogonal Scheduling (OFDM) for services and/or eMBB resource preemption for uRLLC.

Usually, the base station scheduler selects the correct transmission parameters based on the channel state information feedback, including all or part of the covariance matrix, eigenvalues, rank indicators, channel quality information, and the like. Spatial multiplexing, which relies on multiple antennas or multiple-input multiple-output (MIMO) techniques, is widely used when multipath effects are abundant due to reflections. On the other hand, non-orthogonal transmission schemes provide poor performance due to multipath and require a higher operating signal-to-noise ratio (SNR).

In contrast, embodiments of the present invention may use an enhanced adaptive transmission scheme that takes into account the coexistence of uRLLC and eMBB with flexible reliability targets, and may be selected for each transmission attempt based on the reliability target The best reuse technology. Therefore, embodiments of the present invention can avoid resource over-provisioning by using loose transmit multiplexing in the initial transmission, which can coexist uRLLC service and eMBB service at equally strict and more strict transmit multiplexing, the same strict or Tighter transmit multiplexing provides the reliability required for uRLLC retransmissions to decode within HARQ delays.

Since the combined reliability of eMBB data and uRLLC data is relaxed in the initial transmission, a NOMA scheme that satisfies low reliability requirements can be used. Since orthogonal scheduling can meet high reliability requirements, orthogonal scheduling that provides separate resources for uRLLC data and eMBB data can be considered for retransmission.

The enhanced adaptive transmission scheme can also be used without HARQ, which is a blind repetition-based dynamic transmission multiplexing method in which flexible reliability targets can be introduced.

The embodiments of the present invention have the following advantages in particular: First, the optimal transmission method is selected based on the reliability target, which satisfies the requirements of uRLLC data transmission.

Second, the Loglikelihood Ratio (LLR) quality of the soft buffer can be improved and the IR gain can be maintained compared to the MCS that varies within the HARQ delay range. In the case of uRLLC, since the scheduling interval is short, the channel instantaneously changes slowly, and the modulation and coding scheme (MCS) is adjusted not to conform to the radio conditions.

In addition, overlapping eMBB symbol performance is slightly degraded; a conservative MCS scheme can be used for uRLLC; MCS for uRLLC does not necessarily have to be adjusted for incremental redundancy (IR) gain in retransmission. Last but not least, resource efficiency for uRLLC can be obtained by adjusting the transmission method.

In the case of no HARQ transmission (ie, repetition-based transmission), the transmission parameters of the multiplexing scheme (eg, spatial multiplexing or NOMA) of the same transport block in subsequent repetitions can be dynamically adjusted. Similarly, in the case of HARQ based transmission with ACK/NACK messages as feedback, the transmission parameters of the adaptive HARQ scheme for the same transport block can be dynamically adjusted to provide sufficient spectral efficiency and required reliability.

FIG. 8 shows a schematic diagram of adaptive transmission based on flexible reliability targets, wherein the processor 605 of the transmitter 601 can determine a corresponding transmit multiplexing scheme that can meet the reliability requirements of each data transmission, according to an embodiment.

According to the adaptive HARQ transmission scheme, the transmitter 601 may consider the channel conditions and reliability requirements, and then dynamically select the transmission method as shown in FIG. 8 . As an example, in method 1, within the HARQ delay of uRLLC data, different superposition techniques (eg, NOMA) and orthogonal scheduling techniques may be used for initial transmission and retransmission, respectively. In method 2, different spatial multiplexing and puncturing techniques can be used within the HARQ delay range of uRLLC data. Finally, a combination of methods 1 and 2 can be applied in method 3.

FIG. 9 shows a schematic diagram of an adaptive transmission method according to an embodiment, which can meet different reliability requirements in the case of coexistence of uRLLC and eMBB. As shown in Figure 9, orthogonal scheduling can provide the highest reliability (ie, lowest block error rate), while the superposition-based transmission method provides the lowest reliability, but the highest spectral efficiency.

Assuming that the uRLLC service supports mini-slot (eg, 2-OFDM symbol) based transmission and the eMBB service uses 1 ms subframes, an enhanced adaptive HARQ scheme can be used to handle overlapping symbols for eMBB and uRLLC transmissions. For uRLLC and eMBB data transmission, this scheme can perform both non-slot-based transmission and slot-based unified scheduling.

As shown in FIG. 10, in the case of non-slot based transmission, the uRLLC transmission method based on mini-slots (eg, 2-OFDM symbols) can be adjusted within the scheduling period of eMBB transmission. In this case, the adaptive HARQ scheme is applicable to the uRLLC symbols as well as the overlapping symbols of the eMBB region. In the case of a slot-based unified scheduling scheme, adaptive HARQ transmission requires the combined downlink control information (DCI) content of uRLLC data and eMBB data.

Figure 10 shows a schematic diagram of adaptive transmission in the case of non-uniform scheduling of eMBB data and uRLLC data, wherein uRLLC service uses 0.125ms slot based transmission and eMBB transmission is scheduled with 1ms subframe type, according to an embodiment .

According to an embodiment, the transmitter 601 can carefully handle overlapping symbols in the coexistence region, wherein the initial transmission of uRLLC data with relaxed reliability requirements can be performed according to a superposition-based transmission scheme, and subsequent transmissions with high reliability requirements can use robust transmission method (such as orthogonal scheduling) to deal with. Therefore, this embodiment can improve scheduling flexibility and spectral efficiency, meet the reliability requirements of uRLLC data, and slightly reduce the performance of eMBB transmission.

11 shows a schematic diagram of an exemplary frame structure for multiplexing uRLLC transmission and eMBB transmission, wherein uRLLC service uses 0.1ms slot based transmission and eMBB transmission is scheduled with 1ms subframe type, according to an embodiment.

In a further embodiment, Figure 12 shows a schematic diagram of adaptive transmission in the case of non-uniform scheduling of eMBB data and uRLLC data, where the uRLLC service uses minislot-based transmission (eg, 2 or 4 or 7 OFDM symbols), while eMBB transmissions are scheduled with a 1ms subframe type.

As already explained in Fig. 10 before, based on the different reliability requirements of uRLLC transmission, the transmitter can carefully handle overlapping symbols in the coexistence region shown in Fig. 12 according to different transmission schemes.

In an embodiment, the communication interface of the transmitter is also used to signal the corresponding transmit multiplexing scheme to the receiver, especially in the control information, wherein the corresponding transmit multiplexing scheme is signaled. The scheme includes information indicating the corresponding transmission scheme. Thus, the processor 635 of the receiver 631 is allowed to decode the eMBB transmission and the uRLLC transmission accordingly.

As shown in FIG. 13 , the receiver 631 may be provided with information on the change of the corresponding transmission scheme for each retransmission in the control information, wherein the information element indicating the transmission method in the L1 uRLLC DCI signaling may be redundant with the corresponding Version (RV0) for common use. An information field needs to be added in the HARQ L1 DCI signaling to explicitly indicate the desired demultiplexing scheme for uRLLC data and eMBB data that can be applied at the receiving side.

In one embodiment, the communication interface 603 of the transmitter 601 is also used to transmit data packets to the receiver 631 using a predetermined transmit multiplexing scheme. Thereafter, the communication interface 603 sends a radio resource control (RRC) reconfiguration request to the receiver 631, wherein the RRC reconfiguration request indicates a change from sending data packets using a predetermined sending multiplexing scheme to using a corresponding sending multiplexing scheme. Send packets with a scheme. Figure 14 shows an exemplary process according to this embodiment, wherein the process includes the following steps:

First, the communication interface 603 of the transmitter 601 (ie, gNB) is used to send a radio resource control (RRC) reconfiguration request to the receiver 631, wherein the RRC reconfiguration request indicates that the data packet is to be sent from using a predetermined transmission multiplexing scheme Change to use the corresponding transmission multiplexing scheme to transmit data packets (step 1401).

Secondly, the communication interface 603 of the transmitter 601 may signal the corresponding transmit multiplexing scheme to the receiver 631, in particular in the control information, wherein the corresponding transmit multiplexing scheme includes an indication Information of the corresponding transmission scheme (step 1403).

Therefore, the receiving side 631 (ie, the user entity) that knows the redundancy version (RV) can know the transmission scheme adopted by the transmitter 601 to transmit the data, and can select the demultiplexing method accordingly.

In the case of a flexible adaptive HARQ scheme with pre-indication, an information field needs to be added to the pre-indication message to provide the desired transmission method suitable for uRLLC data that needs to be applied at the receiver side. In the 5G NR protocol, the pre-indication can be part of the CORESET design with a group common PDCCH, as shown in Figure 15, where the periodicity is semi-statically configured through Radio Resource Control (RRC). For more details, see "Overview of Remaining Issues with Preemption Indication", Huawei Tdoc.

In the uplink case, when a license-based or license-free eMBB transmission is in progress, license-free uRLLC transmission can be configured by superimposing time or frequency resources to the ongoing eMBB transmission using the NOMA scheme, and then the license-based uRLLC uses for retransmission through different multiplexing transmission methods.

FIG. 16 shows a schematic diagram of a method 1600 of sending data packets to the receiver 631 according to an embodiment, in particular sending data packets according to a hybrid automatic repeat request (HARQ) scheme or a blind repeat scheme.

The sending method 1600 includes the following steps: determining 1601 a first sending multiplexing scheme for sending data packets in the first transmission 701; using the first sending multiplexing scheme to send 1603 the data packets in the first transmission 701; determining 1605 using In the second transmission multiplexing scheme for sending data packets in the second transmission 702, the block error rate associated with the first transmission multiplexing scheme is higher than the block error rate associated with the second transmission multiplexing scheme; using the second transmission multiplexing scheme The scheme sends 1607 packets in a second transmission 702, where the first transmission 701 and the second transmission 702 are separated in time.

Figure 17 shows a schematic diagram of a method 1700 of receiving a data packet from a transmitter 601, in particular according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme, according to an embodiment.

The receiving method 1700 includes the following steps: receiving 1701 a received data packet in a first transmission 701 according to a first transmit multiplexing scheme; decoding 1703 the received data packet according to the first transmit multiplexing scheme; Data packets are received 1705 in a second transmission 702, wherein the first transmission 701 is separated in time from the second transmission 702; and the received data packets are decoded 1707 according to a second transmit multiplexing scheme, wherein the first transmit multiplexing scheme is associated The block error rate is higher than the block error rate associated with the second transmission multiplexing scheme.

Although a particular feature or aspect of the present disclosure may be disclosed in only one of several implementations or examples, such feature or aspect may be combined with one or more other features or aspects in other implementations or examples, As such combinations may be desirable and advantageous for any given or specific application. Furthermore, where the terms "comprising," "having," "having," or other variations are used in the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term "comprising." Likewise, the terms "exemplary," "for example," and "such as" are meant to be examples only, not optimal or optimal. The terms "coupled", "connected" and their derivatives may be used. It should be understood that these terms may be used to indicate that two elements co-operate or interact with each other, whether they are in direct physical or electrical contact, or they are not in direct contact with each other.

Although specific aspects have been illustrated and described herein, those of ordinary skill in the art will appreciate that various alternative and/or equivalent embodiments may be substituted for the specific aspects shown and described without departing from the scope of the invention. This application is intended to cover adaptations or variations of the specific aspects discussed herein.

Although elements in the following claims are recited in a specific order with corresponding labels, these elements are not necessarily intended to be limiting unless the claim otherwise implies a specific order for implementing some or all of these elements. to be implemented in that specific order.

From the above, many alternatives, modifications, and variations will be apparent to those skilled in the art. Of course, those skilled in the art will readily recognize that the present invention has many applications beyond those described herein. Although the invention has been described with reference to one or more specific embodiments, those skilled in the art will recognize that many changes may be made thereto without departing from the scope of the invention. Therefore, it is to be understood that within the scope of the appended claims and their equivalents, the invention may be practiced otherwise than as specifically described herein.

Claims (18)

1. A transmitter (601) for sending data packets to a receiver (631), in particular according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme, to the receiver (631), said The transmitter includes: a communication interface (603) for transmitting the data packets; and processor (605) for - determining a first transmit multiplexing scheme for transmitting the data packets in the first transmission (701), and - determining a second transmit multiplexing scheme for transmitting said data packets in a second transmission (702), Wherein, the estimated block error rate associated with the first transmission multiplexing scheme is higher than the estimated block error rate associated with the second transmission multiplexing scheme, and the first transmission (701) and the second transmission (702) ) are separated in time. 2. The transmitter (601) of claim 1, wherein, the communication interface (603) is configured to receive a retransmission request after sending the data packet in the first transmission (701), the retransmission request requesting retransmission of the data packet; and wherein, The processor (605) is configured to determine the second multiplexing scheme after receiving the retransmission request. 3. The transmitter (601) of any preceding claim, wherein the processor (605) is adapted to determine the said second multiplexing scheme, and/or wherein said communication interface (603) is adapted to re-enable in said second transmission (702) after expiration of a predetermined time interval following said first transmission (701). transmit the data packet. 4. The transmitter (601) of any preceding claim, wherein the data packet comprises a first data packet part and a second data packet part, wherein the first data of the data packet The packet portion requires higher reliability and/or lower latency than the second data packet portion. 5. The transmitter (601) according to claim 4, wherein the first data packet portion is associated with a data transmission service, in particular a uRLLC service, and wherein the processor (605) is adapted to determine The respective transmit multiplexing scheme that satisfies the block error rate requirement associated with the data transmit service. 6. The transmitter (601) according to claim 4 or 5, wherein the second data packet part is associated with a second data transmission service, in particular with eMBB. 7. The transmitter (601) of any preceding claim, wherein the first transmit multiplexing scheme is associated with transmission according to the first transmit scheme and the second transmit multiplexing scheme is associated with Transmission association for the second transmission scheme. 8. The transmitter (601) of claim 7, wherein the first transmission scheme and the second transmission scheme comprise at least one of the following schemes: superimposing the first data packet portion with the second transmission scheme Two packet parts, in particular superposition-based transmission methods such as Non-Orthogonal Multiple Access (NOMA), and/or spatial multiplexing, coding schemes, modulation, preemption, puncturing, or scheduling, and wherein the second transmission The scheme is different from the first transmission scheme. 9. The transmitter (601) of claim 7 or 8, wherein the first transmission scheme provides higher spectral efficiency than the second transmission scheme. 10. The transmitter (601) according to any one of the preceding claims, the processor (605) further adapted to be based on channel conditions between the transmitter (601) and the receiver (631) to determine the corresponding transmit multiplexing scheme for retransmitting the data packet. 11. The transmitter (601) according to any one of the preceding claims, the communication interface (603) being further adapted to (631) signal the receiver the respective transmit multiplexing scheme, in particular in The respective transmit multiplexing scheme is signaled in the control information, wherein the respective transmit multiplexing scheme includes information indicating the respective transmit scheme. 12. The transmitter (601) according to any one of the preceding claims, the communication interface (603) further configured to transmit the data packets to the receiver (631) using a predetermined transmit multiplexing scheme. 13. The transmitter (601 ) of claim 12, the communication interface (603) further for: sending a reconfiguration message to the receiver (631), wherein the reconfiguration message indicates one or more predetermined sets of transmission multiplexing schemes, the transmission multiplexing schemes being associated with a redundancy version and/or a transmission number; as well as The receiver is signaled in the reconfiguration message the one or more predetermined sets, wherein dynamic activation of one of the one or more predetermined sets is performed by the control information. 14. The transmitter (601) according to claim 12 or 13, the communication interface (603) being further used for: sending a reconfiguration message to the receiver (631), wherein the reconfiguration message indicates that the transmission of the data packet is changed from using the predetermined transmission multiplexing scheme to using the corresponding transmission multiplexing scheme; and signaling the receiver (631) the respective transmit multiplexing scheme, in particular signaling the respective transmit multiplexing scheme in control information, wherein the respective transmit multiplexing scheme comprises indicating the respective transmit program information. 15. A method (1600) for sending data packets to a receiver (631), in particular according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme, the method (1600) comprising: determining (1601) a first transmit multiplexing scheme for transmitting the data packet in a first transmission (701); sending (1603) the data packet in the first transmission (701) using the first transmit multiplexing scheme; determining (1605) a second transmit multiplexing scheme for transmitting the data packet in a second transmission (702), wherein the first transmit multiplexing scheme is associated with a higher block error rate than the second transmit multiplexing scheme the block error rate associated with the scheme; and Sending (1607) the data packet in the second transmission (702) using the second transmission multiplexing scheme, wherein the first transmission (701) and the second transmission (702) are in time separation. 16. A receiver (631) for receiving data packets from a transmitter (601), in particular according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme, the receiver ( 631) including: A communication interface (633) for receiving said data packets in a first transmission (701) according to a first transmit multiplexing scheme and receiving said data packets in a second transmission (702) according to a second transmit multiplexing scheme , wherein the first transmission (701) is separated in time from the second transmission (702); and a processor (635) for decoding the received data packets according to the first transmission multiplexing scheme, and decoding the received data packets according to the second transmission multiplexing scheme, wherein the first transmission multiplexing scheme The block error rate associated with a transmission multiplexing scheme is higher than the block error rate associated with the second transmission multiplexing scheme. 17. A method (1700) of receiving data packets from a transmitter (601), in particular according to a hybrid automatic repeat request (HARQ) scheme or a blind repetition scheme, the method (1700) comprising: receiving (1701) the data packet in a first transmission (701) according to a first transmit multiplexing scheme; Decode (1703) the received data packet according to the first transmit multiplexing scheme; receiving (1705) the data packet in a second transmission (702) according to a second transmit multiplexing scheme, wherein the first transmission (701) is separated in time from the second transmission (702); and The received data packets are decoded (1707) according to the second transmission multiplexing scheme, wherein the block error rate associated with the first transmission multiplexing scheme is higher than the block error rate associated with the second transmission multiplexing scheme Rate. 18. A computer program comprising program code which, when run on a computer, performs the method (1600) of claim 15 or the method (1700) of claim 17.

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