Transmitting device, receiving device, transmitting method, receiving method, and integrated circuit

Abstract

To facilitate providing flexible demodulation reference signal configuration during repetition of a data channel.SOLUTION: A transmitting device according to an embodiment of the present disclosure includes a circuit that, during operation, allocates data repetitions and DMRS to time domain resources and obtains a DMRS allocation indicating whether a DMRS is allocated to the time domain resource, in which each of the data repetitions includes a number of consecutive symbols less than a slot, and a transceiver that, during operation, transmits the data and the DMRS to the receiving device within the slot, in which the transceiver performs transmission of the DMRS in the data repetitions on the basis of the DMRS allocation, and symbols between the data repetitions are assigned symbols that are not valid for uplink transmission.SELECTED DRAWING: Figure 14

Description

Technical Field

[0001] The present disclosure relates to transmission and reception, devices, and methods in a communication system such as a 3GPP (3rd Generation Partnership Project) (registered trademark) communication system.

Background Art

[0002] Recently, the 3rd Generation Partnership Project (3GPP) completed the first release (Release 15) of technical specifications for next-generation cellular technology, also known as 5G. At the 71st meeting of the Radio Access Network (RAN) of the 3GPP Technical Specification Group (TSG) (Gothenburg, March 2016), the first study item of 5G, "Study on New Radio Access Technology," in which RAN1, RAN2, RAN3, and RAN4 were involved, was approved as a potential work item for Release 15 to define the first standard specifications for 5G. The purpose of the study item is to develop a "New (New) Radio (NR)" access technology defined during the RAN requirement study that operates in a frequency band up to 100 GHz and supports a wide range of use cases (see, for example, 3GPP TR 38.913 "Study on Scenarios and Requirements for Next Generation Access Technologies," current version 14.3.0 available at www.3gpp.org).

[0003] The International Telecommunication Union's IMT-1010 (International Mobile Telecommunications-2020) specification broadly classifies three main scenarios for next-generation mobile communications: enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable and low-latency communications (URLLC). The recently completed 3GPP Release 15 focused primarily on standardizing the specifications for eMBB and providing initial support for URLLC. For example, eMBB deployment scenarios may include indoor hotspots, densely populated urban areas, suburbs, cities, and high-speed environments. URLLC deployment scenarios may include industrial control systems, mobile healthcare (remote monitoring, diagnosis, and treatment), real-time vehicle control, and wide-area monitoring and control systems for smart grids. mMTC may include scenarios using numerous devices with low-latency data transmission, such as smart wearables and sensor networks.

[0004] In Release 15, the URLLC scope for reliability includes new CQI (Channel Quality Index) and MCS (Modulation and Coding Scheme) table design specifications for target BLER 1E-5, in addition to the already agreed-upon table for target BLER 1E-1. For URLLC, one new RRC parameter is introduced to set a new RNTI (Radio Network Temporary Identifier) ​​for grant-based transmissions. If a new RNTI is not set, the existing RRC parameter "mcs-table" is extended to select from three MCS tables (existing 64QAM MCS table, existing 256QAM MCS table, and new 64QAM MCS table). If mcs-table indicates the new 64QAM MCS table, the existing 64QAM MCS table is used for DCI format 0_0 / 1_0 in CSS (Common Search Space), and the new 64QAM MCS table is used for DCI format 0_0 / 1_0 / 0_1 / 1_1 in USS (User Search Space). Otherwise, the existing behavior is followed. When a new RNTI is configured (via RRC (Radio Resource Control)), DCI CRC's RNTI scrambling is used to select the MCS table. If DCI CRC is scrambled with the new RNTI, the new 64QAM MCS table is used. Otherwise, the existing behavior is followed. The above configurations are separate for DL ​​(downlink) and UL (uplink).

[0005] The reliability scope of URLLC in Release 15 was quite limited. Therefore, RAN#80 approved a new SID for physical layer enhancements for NR URLLC (see RP-181477 "New SID on Physical Layer Enhancements for NR URLLC," Huawei, HiSilicon, Nokia, and Nokia Shanghai Bell). Basic support for URLLC was introduced in Release 15. Further use cases with more stringent requirements have been identified for NR URLLC Rel.16, including factory automation, the transportation industry, and power distribution. [Overview of the project]

[0006] One non-limiting and exemplary embodiment facilitates the provision of flexible demodulation reference signal settings during data channel repetition.

[0007] In a general embodiment, the technology disclosed herein features a transmitting device for transmitting data to a receiving device in a communication system. The transmitting device, in operation, includes a plurality of TTIs, including an initial transmission time interval (TTI) and one or more subsequent TTIs following the initial TTI; further, it includes a circuit for assigning data to the initial TTI and for each of the one or more subsequent TTIs, it includes a DMRS assignment indicating whether the DMRS is assigned to that subsequent TTI so as to be transmitted in addition to the data. Each of the plurality of TTIs contains fewer symbols than a slot, and the data assigned to each of the plurality of TTIs is identical. The transmitting device, in operation, further includes a transceiver that transmits to the receiving device, within a slot, the data assigned to the initial TTI and the DMRS and the data assigned to one or more subsequent TTIs. DMRS transmissions in one or more subsequent TTIs are performed according to the DMRS assignment.

[0008] It should be noted that general or specific embodiments can be implemented as systems, methods, integrated circuits, computer programs, storage media, or any selective combination thereof.

[0009] Further benefits and advantages of the disclosed embodiments will become apparent from this specification and the drawings. These benefits and / or advantages can be obtained individually by the various embodiments and features of this specification and the drawings. However, it is not necessary to provide all of these features in order to obtain one or more of such benefits and / or advantages. [Brief explanation of the drawing]

[0010] [Figure 1] A schematic diagram illustrating an exemplary architecture for a 3GPP NR system. [Figure 2] Exemplary user and control plane architecture block diagrams for LTE eNB, NR gNB, and UE. [Figure 3] A schematic diagram illustrating usage scenarios for large-scale machine-type communication (mMTC) and ultra-high reliability, low latency communication (URLLC). [Figure 4] A diagram illustrating an example of inter-slot repeating for 2-symbol PUSCH (physical uplink shared channel). [Figure 5] An example diagram showing the repetition of the 4-symbol PUSCH within the same slot. [Figure 6] An example diagram of an 8-symbol pusher including one additional DMRS (Demodulation Reference Signal). [Figure 7] A diagram illustrating repetition with frequency hopping. [Figure 8] A diagram illustrating iteration with beam hopping. [Figure 9] A diagram illustrating an example of iteration on measurement resources within a defined grant. [Figure 10] A diagram illustrating an example of a 2-symbol push transmission with 6 repetitions within a single slot. [Figure 11]Block diagram of the transmitting and receiving devices. [Figure 12] Block diagram of the transmitting device circuit. [Figure 13] Flowcharts for sending and receiving data. [Figure 14] A diagram illustrating an example of removing DMRS symbols from a specific repetition within a single slot. [Figure 15] A diagram illustrating an example of DMRS symbol substitution in data symbols within a specific repetition of a single slot. [Figure 16] A diagram illustrating an example of a combination of removing and replacing DMRS symbols within a single slot. [Figure 17] Flowcharts for uplink transmission and uplink reception methods. [Figure 18] A graph illustrating exemplary control signaling for DMRS allocation. [Figure 19] A diagram illustrating an example of repetition with frequency hopping. [Figure 20] A diagram illustrating an example of iteration involving beam hopping. [Figure 21] A diagram illustrating an example of iteration on measurement resources within a defined grant. [Modes for carrying out the invention]

[0011] As presented in the Background section, 3GPP is working on the next release of the 5th generation cellular technology simply referred to as 5G, including the development of new radio (NR) access technology operating at frequencies in the range up to 100 GHz. 3GPP has to identify and develop the technology components required to successfully standardize an NR system that timely meets both the urgent market needs and the more long-term requirements. To achieve this, the evolution of radio interfaces and radio network architectures are considered in the study item "New Radio Access Technology". The results and agreements are collected in the technical report TR 38.804 v14.0.0 which is incorporated herein by reference in its entirety.

[0012] In particular, there are provisional agreements regarding the overall system architecture. The NG-RAN (Next Generation - Radio Access Network) includes gNBs, which provide the NG-Radio Access User Plane, SDAP / PDCP / RLC / MAC / PHY (Service Data Adaptation Protocol / Packet Data Convergence Protocol / Radio Link Control / Media Access Control / Physical), and the Control Plane, the RRC (Radio Resource Control) protocol termination towards the UE. The NG-RAN architecture is shown in Figure 1 based on TS 38.300 v.15.0.0, Section 4, which is incorporated herein by reference. The gNBs are interconnected with each other by the Xn interface. The gNBs are also connected to the NGC (Next Generation Core) by the Next Generation (NG) interface, more specifically, to the AMF (Access and Mobility Management Function) (e.g., a specific core entity executing the AMF) by the NG-C interface and to the UPF (User Plane Function) (e.g., a specific core entity executing the UPF) by the NG-U interface.

[0013] For example, as reflected in 3GPP TR 38.801 v14.0.0, "Study on new radio access technology: Radio access architecture and interfaces", various different deployment scenarios are currently under discussion for support. For example, a non - centralized deployment scenario (section 5.2 of TR 38.801; centralized deployment is shown in section 5.4; this is incorporated herein by reference) is presented there, where a base station supporting 5G NR can be deployed. Figure 2 shows an exemplary non - centralized deployment scenario, additionally showing a user equipment (UE) connected to both a gNB and an LTE eNB and the LTE eNB, based on FIG. 5.2 - 1 of the aforementioned TR 38.801. As mentioned above, the new eNB for NR 5G may be exemplarily referred to as a gNB.

[0014] Also, as described above, in the 3rd Generation Partnership Project New Radio (3GPP NR), three use cases are considered that are expected to support a wide variety of services and applications by IMT - 2020 (see Recommendation ITU - R M.2083: IMT Vision - "Framework and overall objectives of the future development of IMT for 2020 and beyond", September 2015). The specifications for phase 1 of enhanced mobile broadband (eMBB) were finalized by 3GPP in December 2017. In addition to further expanding eMBB support, current and future work will involve standardization for ultra - reliable and low - latency communication (URLLC) and massive machine - type communication. Figure 3 (from Recommendation ITU - R M.2083) shows some examples of the expected usage scenarios of IMT after 2020.

[0015] URLLC use cases have stringent requirements for capabilities such as throughput, latency, and availability, and are envisioned as one of the enablers for future vertical applications such as wireless control of industrial manufacturing or production processes, remote surgery, power distribution automation in smart grids, and transportation safety. The current WID (Work Item Description) RP-172115 agrees to support ultra-high reliability for URLLC by identifying technologies that meet the requirements set out by TR 38.913.

[0016] For NR URLLC in Release 15, key requirements include a target user plane delay of 0.5 ms for UL (uplink) and 0.5 ms for DL ​​(downlink). A typical URLLC requirement for a single packet transmission is a BLER (block error rate) of 1E-5 for a 32-byte packet size at a 1 ms user plane. From a RAN1 perspective, reliability can be improved in several possible ways. The current scope for reliability improvements is covered in RP-172817, which includes defining separate CQI tables for URLLC, a more compact DCI format, and PDCCH iterations. However, as NR develops more stably, the scope may broaden to achieve ultra-high reliability (see also 3GPP TR 38.913 V15.0.0 “Study on Scenarios and Requirements for Next Generation Access Technologies,” incorporated herein by reference, for key requirements for NR URLLC). Therefore, NR URLLC in Release 15 must be able to transmit 32-byte data packets within a user-plane delay of 1 ms with a success rate corresponding to BLER of 1E-5. Specific use cases for NR URLLC in Rel.15 include augmented reality / virtual reality (AR / VR), e-health, e-safety, and mission-critical applications (see also ITU-R M.2083-0).

[0017] Furthermore, the technical enhancements targeted by NR URLLC in Release 15 aim to improve latency and reliability. These latency-improving enhancements include configurable neurology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplinks, slot-level iteration for data channels, and downlink preemption. Preemption means that a transmission for which resources have already been allocated is stopped, and those already allocated resources are used for another transmission that is later requested but has lower latency / higher priority requirements. Thus, transmissions that are already permitted are preempted by later transmissions. Preemption is applicable regardless of the specific service type. For example, a transmission for service type A (URLLC) may be preempted by a transmission for service type B (eMBB, etc.). Technical enhancements for reliability improvements include a dedicated CQI / MCS table for target BLER 1E-5 (see also 3GPP TS 38.211 “NR; Physical channels and modulation”, TS 38.212 “NR; Multiplexing and channel coding”, TS 38.213 “NR; Physical layer procedures for control”, and TS 38.214 “NR; Physical layer procedures for data” (all versions V15.2.0) incorporated herein by reference).

[0018] The use case for mMTC is characterized by a very large number of connected devices that typically transmit relatively small amounts of non-delay sensitive data. These devices are required to be inexpensive and have very long battery life. From a noise reduction (NR) perspective, utilizing a very narrow bandwidth portion is one possible solution to enable low power consumption and long battery life from a user experience (UE) perspective.

[0019] As mentioned above, the scope of reliability in NR is expected to broaden. One key requirement for all cases, particularly for URLLC and mMTC, is high or very high reliability. Several mechanisms can be considered to improve reliability from both a radio and network perspective. There are only a few key areas that can help improve reliability. These areas include compact control channel information, data / control channel repetition, and diversity in the frequency, time, and / or spatial domains. These areas are generally applicable to reliability regardless of the specific communication scenario.

[0020] For NR URLLC Rel.16, further use cases with more stringent requirements have been identified, such as factory automation, the transportation industry, and power distribution (see RP-181477 "New SID on Physical Layer Enhancements for NR URLLC," incorporated herein by reference, Huawei, HiSilicon, Nokia, and Nokia Shanghai Bell). These stringent requirements necessitate higher reliability depending on the use case (up to 10 -6 The requirements include a higher level of availability, a maximum packet size of 256 bytes, time synchronization down to the order of a few microseconds (which may be 1 microsecond or several microseconds depending on the frequency range), and a short delay of the order of 0.5 to 1 ms (in particular, a target user plane delay of 0.5 ms) (see also 3GPP TS 22.261 “Service requirements for next generation new services and markets” V16.4.0 and RP-181477 incorporated herein by reference).

[0021] Furthermore, several technical enhancements to NR URLLC in Rel.16 from the perspective of RAN1 have been identified. These include PDCCH enhancements related to compact DCI, PDCCH (Physical Downlink Control Channel) repetition, and increased PDCCH monitoring. In addition, UCI (Uplink Control Information) enhancements relate to enhanced HARQ (Hybrid Automatic Retransmission Request) and CSI feedback enhancements. PUSCH enhancements and retransmission / repetition enhancements related to minislot level hopping have also been identified. The term "minislot" refers to a Transmission Time Interval (TTI) containing fewer symbols than a slot (a slot containing 14 symbols).

[0022] Generally, TTI defines the timing granularity for scheduling assignments. 1 TTI is the time interval at which a given signal is mapped to the physical layer. Traditionally, the TTI length can vary from 14 symbols (slot-based scheduling) to 2 symbols (non-slot-based scheduling). Downlink and uplink transmissions are specified to be organized into frames (10ms in duration) consisting of 10 subframes (1ms in duration). In slot-based transmissions, subframes are divided into slots. The number of slots is determined by the neurology / subcarrier interval, and the specified value ranges between 10 slots for a 15kHz subcarrier interval and 320 slots for a 240kHz subcarrier interval. The number of OFDM symbols per slot is 14 for a normal cyclic prefix and 12 for an extended cyclic prefix (see sections 4.1 (general frame structure), 4.2 (Numerologies), 4.3.1 (frames and subframes), and 4.3.2 (slots) of 3GPP TS 38.211 V15.0.0 (2017-12), incorporated herein by reference). However, the allocation of time resources for transmissions may also be non-slot-based. In particular, TTI in non-slot-based allocation may correspond to minislots rather than slots; that is, one or more minislots may be allocated to a requested transmission of data / control signaling. In non-slot-based allocation, the minimum length of TTI may conventionally be 2 OFDM symbols.

[0023] Other identified extensions relate to scheduling / HARQ / CSI processing timelines and UL inter-UE Tx prioritization / multiplexing. Further identified extensions focus on improved configured grant behavior, including configured grant (grant-free) transmission of ULs, exemplary methods such as explicit HARQ-ACK, guaranteeing K repetitions and mini-slot repetitions within a slot, and other MIMO (multiple input multiple output) related extensions (see also 3GPP TS 22.261 V16.4.0).

[0024] This disclosure relates to potential Layer 1 enhancements for further improving reliability / latency and for other requirements related to use cases identified in (RP-181477 "New SID on Physical Layer Enhancements for NR URLLC", Huawei, HiSilicon, Nokia, Nokia Shanghai Bell). Specifically, enhancements for PUSCH (Physical Uplink Shared Channel) repeats are discussed. The impact of the proposed ideas in this disclosure is expected to extend to PUSCH repeat enhancements, which are within the main scope of the new SI (Study Items) / WI (Work Items) for NR URLLC in Rel. 16.

[0025] (PUSCH repeated) One of the scopes for potential expansion relates to mini-slot repeats of PUSCH in a slot. Below, we provide motivation for supporting repeats of PUSCH in a slot, which may allow for potential expansions to the repeat mechanism in order to further improve reliability and / or delay to meet the new requirements of NR URLLC.

[0026] To meet the latency requirements for URLLC push transmissions, one-shot transmission (i.e., single-time-in-one (TTI) assignment) is ideal, provided reliability requirements are met. However, the target BLER of 1E-5 is not always achieved with one-shot transmissions. Therefore, a retransmission or repetition mechanism is required. NR Rel. 15 supports both retransmission and repetition to achieve the target BLER when one-shot transmission is insufficient. In HARQ-based retransmission, it is well known that overall reliability is improved by using feedback information to improve subsequent retransmissions depending on the channel state. However, retransmissions suffer additional delays due to the feedback processing timeline. Therefore, repetition is useful for services with high latency tolerance because it transmits subsequent identical data packets without waiting for feedback.

[0027] Push repetition can be defined as "transmitting the same uplink data packet multiple times without waiting for feedback from one or more previous transmissions of the same data packet." The advantage of push repetition is that, because feedback is not required, overall reliability is improved and latency is reduced compared to HARQ. However, it can generally be link-unresponsive and resource-inefficient.

[0028] NR Rel.15 introduces limited support for repetition. Only quasi-static configuration of repetition is permitted. Furthermore, repetition is permitted only between slots (slot-level PUSCH repetition), as shown in Figure 4. That is, repetition is only possible in the slot following the slot of the previous transmission. Depending on the neurology and service type (e.g., URLLC, eMBB), the delay between repetitions may be too long in the case of inter-slot repetition. This type of repetition is primarily useful for PUSCH mapping type A, which allows PUSCH transmissions to start only from the beginning of the slot. Such limited support may not be able to meet the stricter delay requirements in NR Rel.15, namely a maximum delay of 0.5 ms. Therefore, repetition of PUSCH within a slot is considered for NR URLLC in Rel.16.

[0029] Repeats within the same slot may be supported for PUSCH mapping type B, which allows scheduling of a given transmission (or repeats from any symbol in a slot, as opposed to only the beginning of a slot in PUSCH mapping type A). For example, two repeats may be scheduled adjacent to each other within a slot, as shown in Figure 5. This results in even lower delays between repeats compared to inter-slot repeats. In this figure, a single transmission consists of 1 DMRS symbol and 3 data symbols, followed by the exact same repeat.

[0030] However, it can be shown that the exact same configuration can be achieved even with a single transmission without repetition. Essentially, the initial transmission is longer and an additional DMRS symbol is set. This is supported in NR Rel. 15, where the additional DMRS is assigned to the fifth symbol in the slot, as shown in Figure 6. In the example shown in Figure 6, the single transmission consists of one leading DMRS + one additional DMRS setting and six data symbols, which is substantially the same as in the case of repetition.

[0031] Therefore, supporting repetition within the same slot can be considered to provide the same functionality that can be achieved by a single transmission with a longer TTI (Transmission Time Interval) length. Consequently, better functionality should be implemented to support and specify repeated PUSCH transmissions within a slot, offering greater flexibility and advantages that cannot be achieved by existing support for PUSCH transmissions.

[0032] Therefore, it is desirable to improve mini-slot repetition within a slot in order to achieve further flexibility and advantages that cannot be achieved by a single assignment. Accordingly, the present disclosure proposes that, for PUSCH mapping type B, repetition of PUSCH within the same slot should be supported only if it provides additional functionality that offers further flexibility and advantages compared to the existing support for PUSCH transmission.

[0033] Such repetition within a slot appears to offer similar functionality to a single allocation. However, when combined with other existing physical layer technologies, it may provide greater flexibility along with better advantages. Below, we describe several possible use cases that can only be realized if repetition within a slot is supported.

[0034] For PUSCH mapping type B, if frequency hopping between repetitions is permitted within a slot, further frequency diversity gain can be utilized. This provides flexibility to schedule each repetition over two or more hops depending on the size of the bandwidth portion, as shown in Figure 7. Essentially, more configuration is possible compared to a single transmit within a slot. Inter-frequency hopping can refer to hopping between subcarrier blocks, for example, containing 12 subcarriers (corresponding to the size of the resource block in the frequency domain). However, frequency hopping can also refer to bandwidth portion hopping. According to section 4.4.5 of TS 38.211 V15.0.0 (2017-12), a bandwidth portion (or carrier bandwidth portion) is a set of consecutive physical resource blocks as defined in section 4.4.4.3, selected from a subset of consecutive common resource blocks as defined in section 4.4.4.2, for a given neural network on a given carrier.

[0035] Another advantage of using repetitions within a slot is that, as shown in Figure 8, each repetition can be transmitted on a different beam to achieve further spatial diversity gains that are not possible with a single transmission. Beamforming allows the energy of a given radio transmission to be concentrated in a certain direction, and as a result, the range can be extended to compensate for high propagation losses at high frequencies, for example. For example, if one transmission and three repetitions are allowed within a slot, up to four different beams can be used for each transmission, thus providing further spatial diversity and potentially improved reliability.

[0036] In a configured grant (also known as grant-free) PUSCH, all allocated resources for the PUSCH may or may not belong to the uplink. Only symbols designated as UL can be used. Therefore, the number of symbols designated as UL may not be sufficient or contiguous to enable the transmission of a longer PUSCH. Thus, as shown in Figure 9, shorter PUSCHs can be scheduled more efficiently, and repetitions of that PUSCH within a slot can utilize the non-contiguous symbols available to the uplink.

[0037] With respect to PUSCH mapping type B, it is a finding of this disclosure that in-slot repetition (i.e., the entire sequence of initial transmissions and repetitions performed in a single slot), by utilizing frequency diversity and spatial diversity, respectively, can be combined with other physical layer techniques such as frequency hopping and beam hopping to provide better flexibility and advantages. Furthermore, with respect to PUSCH mapping type B with a set grant, in-slot repetition is recognized as enabling efficient use of measurement resources with a small number of UL symbols.

[0038] In conventional iterations, the same transport block (TB) is transmitted in the initial transmission, and all iterations round with the same DMRS settings. However, this can result in an optimal lower limit in terms of DMRS overhead. For example, as shown in Figure 10, for a 2-symbol push with an initial transmission and 6 iterations, the DMRS overhead is 50%, which is very high. For each iteration round, the mini-slot consists of one data symbol and one DMRS symbol within the TTI, which is very inefficient in terms of resource usage because the DMRS symbol appears very frequently throughout the slot period in which the initial transmission and all iterations are executed.

[0039] Thus, it is acknowledged that conventional repetition can result in very large DMRS overhead in certain scenarios where the length of the push is very short. In other words, each repetition round corresponding to one of the subsequent TTI / mini-slots consists of one data symbol and one DMRS symbol, which is very inefficient in terms of resource usage because the DMRS symbol appears very frequently throughout the slot duration. Therefore, it is desirable to improve the mini-slot repetition within the slot to improve latency and / or reliability compared to the conventional repetition mechanism.

[0040] On the other hand, such high-density DMRS are not necessarily required for high-mobility UEs (i.e., UEs that move at high speeds and therefore require frequent adaptation to rapidly changing channel characteristics).

[0041] In view of the above findings and considerations, this disclosure proposes that in a minislot repetition of data within a slot, it is possible to modify or change the DMRS assignment / DMRS symbol assignment in at least one of the repetitions set by the signaling mechanism. For this purpose, the proposed transmitting device, receiving device, transmitting method, and receiving method are described in the following aspects and embodiments of this disclosure.

[0042] While the above motivations refer to the context of PUSCH repetitions and further refer to NR URLLC as a service type, it should be noted that this disclosure is not limited to any particular service type or communication channel / link. In particular, as shown in the following description, this disclosure is applicable to downlinks as well as uplinks.

[0043] In general, this disclosure provides a transmitting device 1110 for transmitting data to a receiving device 1160 via a channel (e.g., a radio channel) in a communication system (particularly a wireless communication system). The transmitting device 1110 shown in Figure 11 comprises a processing circuit 1130 and a transceiver 1120. During operation, the processing circuit assigns data to a plurality of transmit time intervals (TTIs). Each of the plurality of TTIs contains fewer symbols than slots. Here, the data assigned to each TTI of the plurality of TTIs is identical. In addition to the data, a demodulation reference signal (DMRS) is assigned to the initial TTI of the plurality of TTIs. Furthermore, during operation, the circuit 1130 obtains a DMRS assignment for each subsequent TTI that follows the initial TTI of the plurality of TTIs, indicating whether a DMRS is assigned to that TTI. In this disclosure, a device or device component adapted or configured to perform a given task is referred to as “operating” and performs the given task. According to the operation described, the processing circuit 1130 includes a DMRS assignment acquisition unit 1231 and a DMRS / data assignment unit 1232, as shown in Figure 12. The DMRS assignment acquisition unit 1231 acquires a DMRS assignment during operation. The DMRS / data assignment unit 1232 assigns data to multiple TTIs, assigns DMRS to the initial TTI, and assigns or does not assign DMRS to subsequent TTIs according to the DMRS assignment acquired by the DMRS assignment acquisition unit 1231.

[0044] A DMRS allocation is an allocation scheme or allocation setting that indicates whether a DMRS is allocated to a TTI. In other words, a DMRS allocation indicates whether a DMRS is allocated to a TTI in order to be transmitted in addition to the data. Therefore, if a DMRS allocation for one of the subsequent TTIs indicates that a DMRS should be transmitted in that subsequent TTI, then a DMRS is allocated to that subsequent TTI. However, if a DMRS allocation indicates that a DMRS should not be transmitted in that TTI, then a DMRS is not allocated to that TTI.

[0045] The transceiver 1120 of the transmitting device (i.e., the transmitter and receiver, meaning the hardware and software components of the transmitting and / or receiving device adapted to transmit / receive radio signals and modulate / demodulate data allocated to the time and frequency resources of the radio signals) transmits data allocated to multiple TTIs to the receiving device during operation within a slot. Furthermore, the transceiver 1120 transmits the DMRS allocated to the initial TTI in the initial TTI and performs DMRS transmissions in one or more subsequent TTIs according to the acquired DMRS allocation. That is, on the one hand, in subsequent TTIs where DMRS is allocated, DMRS and data are transmitted. On the other hand, in subsequent TTIs where DMRS is not allocated, DMRS is not transmitted and data is transmitted.

[0046] This disclosure further provides a receiving device 1160 that receives data from a transmitting device 1110 via a channel (e.g., a wireless channel) in a communication system such as a wireless system. The receiving device 1160 comprises a circuit 1180 and a transceiver 1170. During operation, the receiving device's circuit 1180 acquires a DMRS assignment for each subsequent TTI, i.e., each subsequent TTI following an initial TTI. The multiple TTIs, including the initial TTI and the subsequent TTIs, each have fewer symbols than the number of slots. The data assigned to each TTI of the multiple TTIs is identical. As described above, the DMRS assignment for a TTI indicates whether or not DMRS is assigned to that TTI so that it is received in addition to the data. During operation, the receiving device 1160's transceiver 1170 receives from the transmitting device, in slots, the data assigned to the initial TTI and the DMRS and the data assigned to one or more subsequent TTIs. DMRS reception in one or more subsequent TTIs is performed according to the DMRS assignment.

[0047] Corresponding to the transmitting device 1110 and receiving device 1160 described above, a transmitting method and a receiving method shown in Figure 13 are provided, respectively. Both the transmitting method and the receiving method include an acquisition step (S1310, S1360) in which a demodulation reference signal (DMRS) assignment is obtained for each of the one or more subsequent TTIs that follow the initial TTI. The DMRS assignment indicates whether the DMRS is assigned to the subsequent TTI so as to be transmitted in addition to the data. Each of the multiple TTIs, including the initial TTI and one or more subsequent TTIs, contains fewer symbols than the number of slots. The transmitting method further includes an assignment step (S1320) in which the same data is assigned to each of the multiple TTIs, the DMRS is assigned to the initial TTI, and the DMRS is assigned to one or more of the one or more subsequent TTIs if indicated by the DMRS assignment. The transmission method further includes a transmission step (S1330) of sending data assigned to the initial TTI and DMRS and data assigned to one or more subsequent TTIs to a receiving device. Here, DMRS transmission in one or more subsequent TTIs is performed according to the DMRS assignment. The reception method includes a reception step (S1370) of receiving data assigned to the initial TTI and DMRS and data assigned to one or more subsequent TTIs from the transmitting device in a slot. Here, DMRS reception in one or more subsequent TTIs is performed according to the DMRS assignment.

[0048] As described above, data and, optionally, reference signals are each assigned to a transmit time interval (TTI) smaller than a slot. Therefore, this disclosure relates particularly to the non-slot-based assignment described above. As described above, in non-slot-based assignment, the minimum length of a TTI can conventionally be 2 OFDM symbols. Such a 2-symbol TTI is shown in Figure 10. A TTI smaller than a slot is referred to in this disclosure as a mini-slot. However, this does not limit this disclosure to such terminology. In particular, due to the small size of a mini-slot TTI, the entire sequence of repetitions, including the initial transmission in the first two symbols (i.e., 1 DMRS symbol and 1 data symbol) and six repetitions each containing 1 DMRS symbol and 1 data symbol, fits within a slot, and thus the entire sequence of repetitions is performed within a single slot. Furthermore, this disclosure also addresses TTIs to which DMRS are not assigned, i.e., TTIs that do not contain DMRS symbols. Therefore, if the DMRS symbol is removed from a mini-slot that has only one data symbol, the minimum TTI size will be one symbol instead of the previously assumed two symbols.

[0049] Within a TTI / mini-slot to which DMRS is assigned, the DMRS-assigned (DMRS) symbol precedes one or more symbols from which data is transmitted. DMRS is used at the receiver side for channel estimation for coherent demodulation. Generally, a TTI can also contain multiple DMRS symbols for DMRS retransmission, preceding one or more data symbols from which data is transmitted.

[0050] However, in scenarios where the channel characteristics are not expected to change during the duration of one or two minislots to the extent that coherent demodulation is impaired, it may suffice to assign the DMRS symbol to the first TTI preceding one or more subsequent TTIs, but not to one or more subsequent TTIs. That is, in such cases, the DMRS is not transmitted in at least one of the one or more subsequent TTIs / minislots that follow the initial TTI. Not assigning the DMRS to subsequent TTIs in a slot in this way may be done in use cases where the transmitting device is expected to be stationary or moving at a slow speed, such as in factory automation.

[0051] An example of flexible DMRS allocation for data repetition is shown in Figure 14. This figure shows a slot containing 14 symbols. The first 10 symbols in this slot are occupied by a series of initial transmissions and repetitions. The initial transmission in the initial mini-slot corresponds to the first 2 symbols, followed by 6 data repetitions in 6 subsequent TTIs. Additional DMRS are transmitted in the 1st and 4th repetitions; that is, both the 1st and 4th subsequent mini-slots contain DMRS symbols in addition to data symbols. Thus, the DMRS allocations for the 1st and 4th subsequent TTIs indicate that DMRS is transmitted in those TTIs, respectively. On the other hand, according to the respective DMRS allocations for the multiple TTIs corresponding to the 2nd, 3rd, 5th, and 6th repetitions, DMRS is not allocated to any of these TTIs.

[0052] The advantages of the transmitting / receiving devices and transmitting / receiving methods of this disclosure are that the ability to flexibly assign and not assign DMRS to minislots, such as flexible removal and / or replacement of DMRS in one or more data repetitions as described below, enables configurations with further advantages that are not possible with a single assignment (i.e., the same DMRS assignment for each TTI of each repetition) due to the limited existing DMRS configurations.

[0053] As previously stated, a DMRS allocation scheme for a minislot (i.e., a TTI with fewer symbols than the slot) indicates or specifies whether a DMRS is allocated to the minislot, more specifically, to one or more symbols of the minislot (generally including the first symbol in chronological order). Thus, a DMRS allocation is also referred to in this disclosure as a DMRS symbol allocation. Further details regarding possible DMRS symbol allocations are provided below. In particular, when a DMRS symbol allocation for at least one TTI in a slot specifies that a DMRS is not allocated to that TTI, how the data is allocated to each symbol of the TTI in the slot is explained.

[0054] Previously, it has been explained that in a series of DMRS iterations in a mini-slot within a single slot, DMRS may not be assigned to a specific TTI on which the data iteration is performed. In particular, flexible DMRS assignment or modification of DMRS symbol assignment according to some embodiments of this disclosure may mean the following: - One or more DMRS symbols are removed in a given iteration, and only one or more data symbols are transmitted in each TTI corresponding to the given iteration. Flexible removal of one or more DMRS symbols in one or more iterations can make it easier to reduce the delay to achieve the final target BLER compared to conventional iterations (i.e., iterations where DMRS is assigned to each TTI in which the iteration takes place). - In a given iteration, one or more DMRS symbols are replaced with one or more data symbols, and the transport block (TB) corresponding to the transmitted data is transmitted at a reduced coding rate compared to the initial transmission. Flexible replacement of one or more DMRS symbols in one or more iterations can easily increase reliability compared to conventional iterations. - A combination of removal and replacement of one or more DMRS symbols is performed. This can easily provide improvements in both delay and reliability compared to conventional iteration.

[0055] (DMRS removal) According to some embodiments, the DMRS assignment further demonstrates that if a DMRS is not assigned to a TTI, the length of that TTI is reduced by the length of one or more symbols corresponding to the DMRS. This means that in a TTI where a DMRS is not assigned, one or more DMRS symbols are removed.

[0056] Therefore, one possible extension to conventional repetition is to allow flexibility to remove DMRS from specific repetitions depending on channel conditions and reliability requirements. For example, in the case of a 2-symbol push with initial transmission and 6 repetitions, if it is permissible to remove DMRS from specific repetitions, one possibility would look like the aforementioned allocation of data and DMRS to the TTI shown in Figure 14. This flexibility not only allows control over DMRS overhead but also provides further flexibility in DMRS configurations that are not currently supported in NR Rel. 15. Furthermore, enabling such flexibility also reduces overall latency.

[0057] For mini-slots / TTIs without DMRS symbols, repeating rounds without DMRS use the last available DMRS for channel estimation. Specifically, the second and third repeats are without DMRS, and these use the DMRS from the first repeat for demodulation. Similarly, the fifth and sixth repeats are without DMRS, and these use the DMRS from the fourth repeat for demodulation.

[0058] With respect to demodulation performance, particularly in applications with low mobility requirements for transmitting devices such as UEs, the difference compared to repetitions without DMRS should be negligible, because the interval from the previous repetition to the last available DMRS is still somewhat small. Furthermore, the same MCS (Modulation-Coding Scheme), especially the same coding rate, may be used in the initial data transmission and in each repetition round, because the same amount of data symbols, such as one data symbol per transmission, is available in the initial TTI and in each subsequent TTI of one or more subsequent TTIs.

[0059] Such configurations (particularly data / DMRS assignment to symbols within a single slot) are not possible under the currently supported DMRS settings for single assignments. For such configurations, performance may be similar to, or even better than, the current settings for single transmissions.

[0060] Furthermore, compared to conventional iteration, the same reliability can be achieved while reducing latency. For example, as shown in Figure 14, the latency is reduced by 4 symbols.

[0061] Furthermore, resources (particularly time-domain resources) can be saved compared to conventional iterations. In conventional iterations, all 14 symbols in a slot are used for a series of initial transmissions and six iterations, but according to this embodiment, some symbols in a slot (for example, the last four symbols of the slot shown in Figure 14) may not be used for the series of initial transmissions and iterations, but may be used for other transmissions, such as other URLLC traffic in a queue for the same or other UEs.

[0062] Therefore, with respect to PUSCH mapping type B in particular as described above, a further finding of this disclosure is that removing DMRS from a particular iteration round in an in-slot iteration for PUSCH mapping type B reduces DMRS overhead and provides greater flexibility in terms of DMRS configuration. This is not currently possible in NR Rel.15. An additional finding is that removing DMRS from a particular iteration round in an in-slot iteration for PUSCH mapping type B also reduces overall latency and makes resources available to other traffic in the pipeline, such as URLLC / eMBB.

[0063] (Replacement of DMRS) According to some embodiments, the DMRS allocation for a subsequent TTI among one or more subsequent TTIs is further shown to be such that if the DMRS cannot be allocated to this subsequent TTI which is smaller than the slot, the symbol for the DMRS allocation in this subsequent TTI is replaced with the symbol for the data allocation. In other words, in a minislot, the DMRS symbol is replaced with the data symbol.

[0064] Figure 15 shows an exemplary assignment of DMRS and data to symbols in a TTI within a slot, where the DMRS symbol is replaced with a data symbol. This slot contains seven minislots, each containing two symbols. The first (initial) minislot in which the initial PUSCH transmission is performed, and the subsequent TTIs in which data is assigned for the first, third, and fifth iterations, each contain one DMRS symbol and one data symbol. However, the second, fourth, and sixth iterations each have no data symbol. In the TTIs corresponding to these iterations, the DMRS is replaced with a data symbol. Thus, the second, fourth, and sixth subsequent minislots each contain two data symbols instead of one DMRS symbol followed by one data symbol.

[0065] The DMRS allocation scheme for repetitions within a slot allows for the application of principles to improve coding gain by reducing the MCS (i.e., coding rate) in a particular repetition, while maintaining desired demodulation performance by ensuring that the spacing between data symbols and DMRS does not become too long. As can be seen from Figure 15, in a TTI with two symbols, when DMRS symbols are replaced with data symbols, the number of symbols available for transmission doubles. Furthermore, the same data is transmitted in each repetition. Therefore, in the two-symbol example, the coding rate can essentially be reduced to half of the coding rate of the initial data transmission in all repetitions to which the change (i.e., replacement of DMRS symbols with data symbols) is applied. However, since this disclosure is not limited to a TTI with two symbols, the reduced coding rate can also take values ​​other than half of the original coding rate at which data is coded in the initial TTI and subsequent TTIs containing DMRS symbols.

[0066] As illustrated in Figure 15, a configuration in which DMRS symbols are replaced with data symbols can achieve similar or even better performance compared to a single assignment, which is not possible under the current DMRS configuration. Furthermore, reliability can be further improved while maintaining the same latency compared to conventional iterations.

[0067] As described above, DMRS symbols may be removed from or replaced from a particular TTI within a slot. For example, within a single slot or a set of slots, changes to DMRS symbol assignments may be limited to either the removal or replacement of DMRS symbols. That is, within such a slot, if DMRS is not assigned to one or more subsequent TTIs, only removal or only replacement is performed. However, as described in the embodiments below, the removal and replacement of DMRS symbols may be combined for different TTIs within a single slot.

[0068] (Combination of removal and substitution) For example, according to some embodiments, DMRS allocation further indicates that if DMRS is not allocated to a TTI, the length of this TTI is reduced by the length of one symbol corresponding to the DMRS (DMRS symbol removal), or the symbol for DMRS allocation in this TTI is replaced with the symbol for data allocation (DMRS symbol replacement). Thus, in one or more subsequent TTIs in which data is repeatedly transmitted within a slot, it is possible to configure the system so that DMRS symbol removal is applied to one of the subsequent TTIs and DMRS symbol replacement is applied to another of the subsequent TTIs, regardless of the chronological order of these TTIs. That is, a TTI in which DMRS symbols are removed may precede a TTI in which DMRS symbols are replaced in transmission order, or vice versa.

[0069] Figure 16 shows slots in which both the removal and replacement of DMRS symbols are performed in different TTIs within the slot. Specifically, the second and fifth successor minislots, which are performed in the second and fifth iterations, are DMRS symbol-free, and the length of these minislots is reduced accordingly. The third and sixth successor minislots, corresponding to the third and sixth iterations, are also DMRS symbol-free, and in these minislots, the DMRS symbols are replaced with additional data symbols. In the third and sixth iterations, which each contain two data symbols, the coding rate can be reduced by half, as described above. Furthermore, as can be seen from this figure, the last two symbols of a slot in chronological order are not used in the initial transmission and iterations and are therefore available for other traffic in the pipeline.

[0070] Such a mixed use of DMRS symbol removal and DMRS symbol substitution in data symbols facilitates increased reliability and reduces latency compared to conventional iterations. While DMRS symbol removal can provide latency improvements, DMRS symbol substitution with reduced coding rate can facilitate increased reliability; however, combinations of these embodiments offer greater flexibility and allow for trade-offs between different objectives.

[0071] As described above, in some embodiments, when the symbols for DMRS allocation in the TTI are replaced with symbols for data allocation, the data is transmitted in this TTI at a lower code rate (or coding rate) than the code rate at which the data is transmitted in the initial TTI. For example, as shown, the lower code rate may be half the code rate at which the data transmitted in the initial TTI / minislot is coded, but this disclosure is not limited to reducing the coding rate by half. Alternatively, if the initial TTI includes two data symbols and one DMRS symbol, and the subsequent TTI includes three data symbols but no DMRS symbol, the coding rate may be reduced to two-thirds of the coding rate used in the initial transmission. As described above, the aforementioned reduction in the coding rate should be understood as a reduction to the coding rate of the data in the initial TTI, rather than reducing the absolute coding rate of 1 to, for example, half. That is, the aforementioned reduction in the coding rate is independent of the original value of the coding rate.

[0072] (Uplink transmission and repetition) Several examples have been shown of how a series of initial transmissions and repetitions constitute an uplink transmission, such as a PUSCH (Physical Uplink Shared Channel) transmission. Thus, in some embodiments, the transmitting device 1110 (specifically, the operating transceiver 1120 of the transmitting device 1110) transmits data to the receiving device on the uplink, and the transceiver 1120 of the transmitting device 1110 further receives control signaling from the receiving device 1160. In response, the receiving device 1160 transmits control signaling to the transmitting device.

[0073] The control signaling includes an assignment indicator that shows the respective DMRS assignment for each subsequent TTI of a subsequent TTI. The transmitting device circuit 1130 obtains the DMRS assignment for each TTI following the initial TTI by evaluating the control signaling.

[0074] In an embodiment in which a transmitting device 1110 transmits data to a receiving device 1160 over an uplink, the transmitting device may be a terminal or user equipment, and the receiving device 1160 may be a base station called a gNB or gNodeB in an NR (New Radio) communication system, corresponding to an eNodeB (eNB) of an LTE (Long Term Evolution) or LTE-Advanced system. Data transmission over the uplink may support an initial PUSCH transmission and one or more repetitions.

[0075] An uplink transmission method and an uplink reception method in accordance with this disclosure are shown in Figure 17. As shown, the gNB corresponding to the receiving device 1160 acquires the DMRS by a decision step S1760 (embodying step S1360 in Figure 13) which determines the DMRS assignment. Specifically, such a decision on the DMRS assignment is performed based on channel quality estimation. Specifically, the base station can estimate the channel quality based on an uplink sounding reference signal (SRS) transmitted by the UE for the purpose of channel quality estimation. The gNB can receive SRS from one or more UEs and determine the DMRS assignment based on the channel state corresponding to the channel quality estimated based on the received SRS.

[0076] Next, the gNB / base station generates a DMRS allocation indicator and, in step S1765, transmits a control signaling including the DMRS allocation indicator to the (user) terminal. The user terminal receives the control signaling including the DMRS allocation indicator in step S1710 (embodying step S1310 in Figure 13) and thereby obtains a DMRS allocation. The allocation step S1320 and transmission step S1330 of the uplink transmission method and the reception step S1370 of the uplink reception method are performed according to the corresponding general methods shown in Figure 13.

[0077] (Control signaling) Specifically, in some embodiments, the DMRS assignment indicator for each subsequent TTI of one or more subsequent TTIs is a 2-bit assignment indicator. The 2 bits are sufficient to indicate whether a DMRS is assigned to the TTI and to further indicate whether the option of DMRS removal or DMRS replacement is applied. Thus, each iteration may be associated with one of the following 2-bit indications. - "00": No changes to one or more DMRS symbols in a given iteration (i.e., DMRS is assigned to TTI) - "01": One or more DMRS symbols are removed, reducing the TTI length for a given repetition. - "10": One or more DMRS symbols are replaced with one or more data symbols, reducing the coding rate for a given repetition. - "11": Reserved entry

[0078] Following the 2-bit indication described above, the DMRS assignment indicator for 6 iterations consists of 6 2-bit indicators. In the example of the combination of DMRS symbol removal and substitution shown in Figure 16, the resulting 12-bit indicator is "00 01 10 00 01 10". This indicator is also shown in Figure 18.

[0079] Clearly, the association between the 2-bit value and the DMRS assignment is merely illustrative. Alternatively, for example, "10" might represent DMRS symbol removal.

[0080] Alternatively, the DMRS assignment indicator may have more or fewer bits than 2. Specifically, the DMRS assignment indicator for each subsequent TTI transmitted within a slot may be a 1-bit indicator, resulting in a 6-bit field for up to 6 retransmissions of DMRS assignment indication. For example, if it is clear or known from the standard or further control signaling what particular changes are made to the assignment in the TTI (e.g., whether the DMRS symbol is removed or replaced), then a 1-bit indicator corresponding to the TTI is sufficient to indicate whether DMRS is assigned to that TTI. For example, a bit value of "0" may indicate that DMRS is assigned to the TTI and transmitted in that TTI, while a bit value of "1" may indicate that DMRS is not assigned, regardless of whether the DMRS symbol is replaced or removed. Therefore, the resulting 6-bit DMRS allocation indicator for all six iterations will be "011011" in the example (removal) shown in Figure 14, and "010101" in the example (substitution) shown in Figure 15. In this case as well, the values ​​"0" and "1" may be reversed, in which case the value "1" signifies the allocation of DMRS to the TTI.

[0081] For example, DMRS allocation indicators (e.g., the aforementioned 1-bit or 2-bit indicators for each TTI) may be included in higher-level signaling. Therefore, DMRS allocation is signaled quasi-statically, specifically in RRC (Radio Resource Control) signaling.

[0082] In some embodiments, the control signaling further includes a DMRS enable indicator indicating whether the DMRS is not assigned to any of the following TTIs. Thus, the DMRS enable indicator, which may be a 1-bit indicator, can indicate whether a flexible repeating setting (in addition to whether the DMRS is assigned to or not to a following TTI, the type of the case where it is not assigned) is applied. In other words, the DMRS enable indicator is set to disable or enable the flexible DMRS setting. Furthermore, the selection of a particular DMRS enable indicator can indicate the degree of flexibility in DMRS assignment.

[0083] Specifically, the DMRS enable indicator may be a one-bit indicator indicating whether flexible DMRS is applied within a slot or within a longer time interval encompassing several slots (for example, the enable indicator may be quasi-statically signaled, as described below). For example, "0" indicates that a flexible repetition allowing DMRS not to be assigned to a particular TTI is not applied, and "1" indicates that a flexible repetition is applied (or vice versa). The one-bit enable indicator may be used in combination with each two-bit indicator for a particular set of TTIs in the set of repetitions described above. For example, if the DMRS enable indicator indicates that flexible DMRS is applied, the two-bit indicator may specify whether DMRS assignment, DMRS removal, or DMRS substitution is applied for a particular TTI within a slot.

[0084] Alternatively, a 1-bit enable indicator may indicate whether DMRS elimination or DMRS substitution is applied (e.g., "0" indicates elimination, and "1" indicates substitution). In this case, whether DMRS is not assigned (specifically, eliminated or substituted depending on the value of the DMRS enable indicator) may be indicated by a 1-bit DMRS assignment indicator for each TTI.

[0085] The enable indicator may be included in the upper-layer signaling. Alternatively, the enable indicator may be included in downlink control information (DCI) (i.e., physical layer control signaling messages transmitted over a PDCCH (physical downlink control channel)), which can be considered as dynamic signaling for transmitting scheduling information (grants) and / or transmission parameters. This disclosure is not limited to any particular DCI format, and the format may correspond to an existing / specified DCI format for NR, or may be agreed upon in the future for a specific type of service such as URLLC. On the one hand, including the enable indicator in the DCI provides greater flexibility because enabling / deactivating DMRS allocation can be performed using grants for a flexible set of data repetitions. On the other hand, signaling the enable indicator in the upper-layer signaling rather than in the DCI avoids introducing further DCI signaling and thus incurring DCI signaling overhead. However, if the DMRS allocation indicator is included in the DCI, advantageously, a 1-bit allocation indicator is used.

[0086] The control signaling and activation indicators described above, including the DMRS assignment indicator for each TTI, constitute a signaling mechanism that can be implemented solely through RRC signaling (quasi-static configurability). Alternatively, the signaling mechanism may be implemented as a combination of both RRC signaling and DCI signaling, as described below.

[0087] If DMRS assignment / activation is performed solely by RRC signaling, two bit fields (referred to herein as “bit field 1” and “bit field 2”) may provide full flexibility to remove or replace DMRS symbols in any iteration round of an iteration (i.e., to flexibly specify the order in which removal, replacement, or assignment may occur within a series of iterations).

[0088] Bitfield 1 may correspond to the aforementioned 1-bit enable indicator indicating whether flexible repeat settings are applied. The exact repeat setting (DMRS assignment) can be set by bitfield 2, which corresponds to the 2-bit assignment indicator provided for each TTI. In bitfield 2, the maximum number of bits is twice the maximum allowed number of repeats. For example, if a maximum of 6 repeats are allowed, a 12-bit field is specified in the RRC to enable flexible repeat settings. Each repeat (i.e., each subsequent TTI) is associated with 2 bits having the indications listed above in the description of the DMRS assignment indicator. Therefore, returning to the example of the DMRS rejection and DMRS substitution combination shown in Figure 16, bitfield 1 has the value "1" (indicating that flexible repeats are applied), and bitfield 2 takes the value "00 01 10 00 01 10" as described above and shown in Figure 18.

[0089] As an alternative to bit field 1, which is a 1-bit field, and bit field 2, which is a field of up to 12 bits, a 1-bit enable indicator indicating whether DMRS substitution or DMRS removal is applied may be combined with the respective 1-bit DMRS allocation indicators for the subsequent TTIs described above. As a further alternative, a 2-bit enable indicator as described above may be combined with the respective 1-bit allocation indicators. In the latter signaling mechanism, bit field 2, which is up to 12 bits, may be reduced by half a bit to a field of up to 6 bits. Thus, resources in RRC signaling are saved.

[0090] Furthermore, according to this disclosure, signaling for one or more DMRS assignments for each TTI corresponding to a repetition may be performed without bitfield 1. Specifically, control signaling associated with a DMRS assignment may include only a DMRS assignment indicator. However, if an enable indicator is included in the RRC control signaling and shows a value of "0" (indicating that flexible repetition is not applied), bitfield 2 does not need to be signaled in the same RRC signaling, and the bit may be reused for indications other than DMRS assignment or may be omitted.

[0091] As an alternative to DMRS allocation / activation control signaling in RRC alone, the signaling mechanism may include both RRC signaling and DCI signaling. Such embodiments may allow for some degree of dynamism in DMRS allocation.

[0092] Specifically, a field called "bitfield 1" may be moved to the DCI. That is, a 1-bit field corresponding to one of the 1-bit enable indicators described above is added to the DCI to dynamically signal whether flexible repeating settings (which are still configurable by the RRC bitfield in this case) are applied (the DCI bitfield value is "1" if flexible repeating settings are applied, and "0" if flexible repeating settings are not applied). When control signaling in RRC and control signaling in DCI are combined, the RRC bitfield in the RRC signaling may be the same as "bitfield 2" described above for RRC-only use. Thus, the repeating setting patterns (i.e., each DMRS assignment of subsequent TTIs) are the same, but their application (i.e., enabling (disabling) the flexible DMRS assignment, "switching" it on or off) is done dynamically via the DCI.

[0093] The single-bit field in the DCI may be a single-bit enable indicator that specifies whether flexible DMRS assignment is enabled or disabled, as described above. In this case, the bit field in the RRC signaling may correspond to a single-bit DMRS assignment indicator (up to 12 bits for up to 6 repetitions) as described above, indicating whether DMRS symbol substitution or DMRS symbol removal is applied. However, the single-bit field in the DCI may also correspond to the indicator described above that indicates whether DMRS removal or DMRS substitution is applied. In this case, the DMRS assignment indicator may have one bit for each subsequent TTI (up to 6 bits for up to 6 repetitions), as described above. As a further alternative, the type of symbol assignment (substitution or deletion) when DMRS is not assigned to a repetition may be predefined, for example, by the standard. In this case, a single-bit enable indicator in the DCI and a single-bit DMRS assignment indicator for each subsequent TTI (e.g., 6 bits for 6 repetitions) would suffice.

[0094] (Further embodiments) Some of the embodiments described above have been described in particular in relation to uplink transmission / repetition. However, as already stated, this disclosure is not limited to the uplink case and may be used in relation to PDSCH repetition. Thus, in some embodiments, the transmitting device, rather than the receiving device, corresponds to the gNB. The transmitting device generates a DMRS assignment indicator and optionally an activation indicator and transmits control signaling including the DMRS assignment indicator to the receiving device (i.e., the (user) terminal). The receiving device receives the DMRS assignment indicator (and optionally the activation indicator), and further receives data in the initial TTI and receives the DMRS in subsequent TTIs according to the DMRS assignment indicated by the received DMRS assignment indicator (and optionally the activation indicator). Here, the activation indicator and the assignment indicator may correspond to any of the indicators described above for the uplink case.

[0095] Furthermore, it should be noted that this disclosure focuses on enabling flexibility in the time domain. The allocation of data and DMRS to carriers or subcarriers, i.e., to resources in the frequency domain of the OFDM system, or to other resources such as spatial resources (beams), is not affected by the DMRS allocation.

[0096] However, the iteration flexibility described herein can also be utilized in frequency hopping, beam hopping, and low measurement resource scenarios, as shown in Figures 19–21. The same phase is used to utilize the DMRS from the last available transmit for channel estimation in the current iteration round. In the case of frequency hopping, channel estimation can be performed from the last available DMRS in the same hop. Similarly, in the case of beam hopping, channel estimation can be performed from the last available DMRS in the same beam.

[0097] Therefore, in some embodiments, as shown in Figure 19, the transceiver transmits, during operation, the data assigned to each subsequent TTI of one or more subsequent TTIs on a different set of subcarriers than the set of subcarriers on which the data was transmitted in the TTI immediately preceding the subsequent TTI. In other words, in two of the multiple TTIs, the data is assigned to and transmitted on different sets of subcarriers. The set of subcarriers may correspond to 12 subcarriers corresponding to the resource block size in the frequency domain, or to the bandwidth portion described above. Thus, frequency hopping may occur before each subsequent TTI to which the DMRS is assigned. However, if frequency hopping occurs from one TTI to the next of the multiple TTIs, the data in the TTI after the frequency hopping step / operation is transmitted on the set of subcarriers on which the DMRS was transmitted in one of the multiple TTIs prior to the TTI after the hopping step. In Figure 19, frequency hopping occurs between the two respective frequency groups / sets.

[0098] Similar to the frequency hopping described above, in some embodiments, as shown in Figure 20, the transceiver transmits the data assigned to each of the one or more subsequent TTIs in operation on a different beam from the one on which data was transmitted in the TTI immediately preceding the subsequent TTI. That is, in two of the TTIs, the data is transmitted on different beams. Similar to frequency hopping, in each TTI, the data is transmitted on the beam on which data was previously transmitted in another TTI. In the beam hopping example shown in Figure 20, beam hopping occurs between two different beams.

[0099] Beam changes or frequency changes from one TTI to the next may be signaled quasi-statically. For example, in addition to DMRS allocation indicators, RRC signaling may also include beam-hopping pattern indicators or frequency-hopping pattern indicators. Furthermore, DCI or RRC may include beam-hopping activators and / or frequency-hopping indicators. Alternatively, when flexible DMRS allocation is enabled, predetermined hopping patterns may be defined in the standard.

[0100] In some further embodiments, the multiple TTIs to which data is assigned for transmission in the initial transmission and repetitions are not consecutive. That is, between two of the multiple TTIs, there exists a symbol that is not included in any of the multiple TTIs. In other words, other data and / or control signaling different from the data assigned to each of the multiple TTIs may be assigned to the symbol between two of the multiple TTIs. An example is shown in Figure 21. In Figure 21, there is an initial PUSCH transmission and three data repetitions in a slot, and DMRS is assigned to the TTIs corresponding to the initial transmission and the second repetition. However, between each of these TTIs, there exists a symbol that is not used in the same set of initial transmissions and repetitions. Furthermore, these symbols that exist in between are symbols that are not used for uplink transmissions.

[0101] Furthermore, in most of the examples shown, the initial transmission begins with the DMRS assigned to the first symbol in the slot. However, especially following the PUSCH mapping type B described above, this disclosure is not limited to an initial TTI that includes the first symbol in the slot in chronological order. Alternatively, the initial transmission may begin with a symbol other than the first symbol in the slot.

[0102] This disclosure can be implemented by software, by hardware, or by software working in conjunction with hardware. Each functional block used in the description of each embodiment above can be implemented in part or in whole by an LSI such as an integrated circuit, and each process described in each embodiment can be controlled in part or in whole by the same LSI or combination of LSIs. An LSI can be formed individually as a chip, or a single chip can be formed to include some or all of the functional blocks. An LSI can include data input / output units coupled to itself. Depending on the degree of integration, LSIs may be referred to as ICs, system LSIs, super LSIs, or ultra LSIs. However, the technology for realizing integrated circuits is not limited to LSIs and can be implemented using dedicated circuits, general-purpose processors, or dedicated processors. Furthermore, FPGAs (field-programmable gate arrays) that can be programmed after the manufacture of the LSI, or reconfigurable processors that can reconfigure the connections and settings of circuit cells located inside the LSI can also be used. This disclosure can be implemented as digital or analog processing. If LSIs are replaced by future integrated circuit technologies as a result of advances in semiconductor technology or other derivative technologies, functional blocks can be integrated using those future integrated circuit technologies. Biotechnology can also be applied.

[0103] In one general aspect, the Disclosure provides a transmitting device for transmitting data to a receiving device in a communication system, comprising: a circuit that, during operation, assigns the data to a plurality of TTIs, including an initial transmission time interval (TTI) and one or more subsequent TTIs following the initial TTI; further assigns a demodulation reference signal (DMRS) to the initial TTI; and for each of the one or more subsequent TTIs, obtains a DMRS assignment indicating whether or not the DMRS is assigned to that subsequent TTI so as to be transmitted in addition to the data, wherein each of the plurality of TTIs includes fewer symbols than a slot, and the data assigned to each of the plurality of TTIs is the same; and a transceiver that, during operation, transmits the data assigned to the initial TTI and the DMRS and the data assigned to the one or more subsequent TTIs to the receiving device within the slot, wherein the DMRS transmission in the one or more subsequent TTIs is performed according to the DMRS assignment.

[0104] This provides greater flexibility for iteration and facilitates reduced latency and / or improved reliability.

[0105] For example, DMRS is not transmitted in at least one of the one or more subsequent TTIs.

[0106] In some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by the length of one symbol corresponding to the DMRS.

[0107] This makes it easier to reduce latency.

[0108] In another embodiment, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the symbol for the assignment of the DMRS in the subsequent TTI is replaced with the symbol for the assignment of the data.

[0109] This makes it easier to enhance reliability.

[0110] In a further embodiment, the DMRS assignment further indicates that, if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by the length of one symbol corresponding to the DMRS, or the symbol for the assignment of the DMRS in the subsequent TTI is replaced with the symbol for the assignment of the data.

[0111] This makes it easier to reduce latency and enhance reliability.

[0112] For example, if the symbols for the allocation of the DMRS in the subsequent TTI are replaced with the symbols for the allocation of the data, the data is transmitted in the subsequent TTI at a lower code rate than the code rate at which the data is transmitted in the initial TTI.

[0113] For example, the transmitting device transmits the data to the receiving device on the uplink, and the transceiver, while operating, further receives control signaling from the receiving device, including a DMRS assignment indicator indicating the DMRS assignment for each of the one or more subsequent TTIs, and the circuit, while operating, obtains the DMRS assignment for each of the one or more subsequent TTIs by evaluating the control signaling.

[0114] For example, the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator.

[0115] In some embodiments, the DMRS allocation indicator is included in the upper-layer signaling.

[0116] For example, the control signaling further includes an enable indicator that shows whether the DMRS is not assigned to any of the one or more subsequent TTIs.

[0117] In some exemplary embodiments, the activation indicator is included in the upper-layer signaling.

[0118] This results in avoiding additional physical layer signaling overhead.

[0119] In another exemplary embodiment, the activation indicator is a 1-bit indicator included in the downlink channel information (DCI).

[0120] This enables flexible dynamic switching of DMRS allocations.

[0121] In some embodiments, the transmitting device transmits the data to the receiving device over the downlink, and the transceiver, while operating, further transmits control signaling to the receiving device for each of the one or more subsequent TTIs, including a DMRS assignment indicator indicating the DMRS assignment.

[0122] For example, in two of the multiple TTIs, the data is assigned to a different set of subcarriers and transmitted in each of the different sets of subcarriers.

[0123] For example, in two of the multiple TTIs, the data is transmitted in different beams.

[0124] In some embodiments, a symbol between two of the plurality of TTIs is not included in any of the plurality of TTIs.

[0125] In another general aspect, a receiving device is provided that receives data from a transmitting device in a communication system, comprising a circuit that, during operation, acquires a DMRS assignment indicating whether a demodulation reference signal (DMRS) is assigned to each of one or more subsequent TTIs following an initial transmission time interval (TTI) so as to be received in addition to the data, wherein each of the plurality of TTIs, including the initial TTI and the one or more subsequent TTIs, includes fewer symbols than a slot, and the DMRS is assigned to the initial TTI, and the data assigned to each of the plurality of TTIs is the same, and further comprising a transceiver that, during operation, receives from the transmitting device, within the slot, the data assigned to the initial TTI and the DMRS and the data assigned to the one or more subsequent TTIs, wherein the DMRS reception in the one or more subsequent TTIs is performed according to the DMRS assignment.

[0126] For example, DMRS is not transmitted in at least one of the one or more subsequent TTIs.

[0127] In some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by the length of one symbol corresponding to the DMRS.

[0128] In another embodiment, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the symbol for the assignment of the DMRS in the subsequent TTI is replaced with the symbol for the assignment of the data.

[0129] In a further embodiment, the DMRS assignment further indicates that, if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by the length of one symbol corresponding to the DMRS, or the symbol for the assignment of the DMRS in the subsequent TTI is replaced with the symbol for the assignment of the data.

[0130] For example, if the symbols for the allocation of the DMRS in the subsequent TTI are replaced with the symbols for the allocation of the data, the data is transmitted in the subsequent TTI at a lower code rate than the code rate at which the data is transmitted in the initial TTI.

[0131] For example, the receiving device receives the data from the transmitting device on the uplink and further transmits control signaling to the transmitting device for each of the one or more subsequent TTIs, including a DMRS assignment indicator indicating the DMRS assignment.

[0132] For example, the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator.

[0133] In some embodiments, the DMRS allocation indicator is included in the upper-layer signaling.

[0134] For example, the control signaling further includes an enable indicator that shows whether the DMRS is not assigned to any of the one or more subsequent TTIs.

[0135] In some exemplary embodiments, the activation indicator is included in the upper-layer signaling.

[0136] In another exemplary embodiment, the activation indicator is a 1-bit indicator included in the downlink channel information (DCI).

[0137] In some embodiments, the receiving device receives the data from the transmitting device on the downlink, and the transceiver, while operating, further receives control signaling from the transmitting device, including a DMRS assignment indicator indicating the DMRS assignment for each of the one or more subsequent TTIs, and the circuit, while operating, obtains the DMRS assignment for each of the one or more subsequent TTIs by evaluating the control signaling.

[0138] For example, in two of the multiple TTIs, the data is assigned to a different set of subcarriers and received in each of the different sets of subcarriers.

[0139] For example, in two of the multiple TTIs, the data is received in different beams.

[0140] In some embodiments, a symbol between two of the plurality of TTIs is not included in any of the plurality of TTIs.

[0141] In another general embodiment, the Disclosure provides a transmission method for a transmitting device that transmits data to a receiving device in a communication system, the transmission method comprising: obtaining a DMRS assignment for each of one or more subsequent TTIs following an initial transmission time interval (TTI), indicating whether a demodulation reference signal (DMRS) is assigned to the subsequent TTI so as to be transmitted in addition to the data, wherein each of the TTIs, including the initial TTI and the one or more subsequent TTIs, comprises fewer symbols than a slot; assigning the same data to each of the TTIs in the group of TTIs and assigning a DMRS to the initial TTI; and transmitting the data assigned to the initial TTI and the DMRS and the data assigned to the one or more subsequent TTIs within the slot to the receiving device, wherein the DMRS transmission in the one or more subsequent TTIs is performed in accordance with the DMRS assignment.

[0142] For example, DMRS is not transmitted in at least one of the one or more subsequent TTIs.

[0143] In some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by the length of one symbol corresponding to the DMRS.

[0144] In another embodiment, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the symbol for the assignment of the DMRS in the subsequent TTI is replaced with the symbol for the assignment of the data.

[0145] In a further embodiment, the DMRS assignment further indicates that, if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by the length of one symbol corresponding to the DMRS, or the symbol for the assignment of the DMRS in the subsequent TTI is replaced with the symbol for the assignment of the data.

[0146] For example, if the symbols for the allocation of the DMRS in the subsequent TTI are replaced with the symbols for the allocation of the data, the data is transmitted in the subsequent TTI at a lower code rate than the code rate at which the data is transmitted in the initial TTI.

[0147] For example, the data is transmitted to the receiving device on the uplink, and the transmission method further includes receiving from the receiving device a control signaling for each of the one or more subsequent TTIs, which includes a DMRS assignment indicator indicating the DMRS assignment, in the step of acquiring, the DMRS assignment is acquired for each of the one or more subsequent TTIs by evaluating the control signaling.

[0148] For example, the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator.

[0149] In some embodiments, the DMRS allocation indicator is included in the upper-layer signaling.

[0150] For example, the control signaling further includes an enable indicator that shows whether the DMRS is not assigned to any of the one or more subsequent TTIs.

[0151] In some exemplary embodiments, the activation indicator is included in the upper-layer signaling.

[0152] In another exemplary embodiment, the activation indicator is a 1-bit indicator included in the downlink channel information (DCI).

[0153] In some embodiments, the data is transmitted to the receiving device on the downlink, and the transmission method further includes transmitting to the receiving device, for each of the one or more subsequent TTIs, control signaling including a DMRS assignment indicator indicating the DMRS assignment.

[0154] For example, in two of the multiple TTIs, the data is assigned to a different set of subcarriers and transmitted in each of the different sets of subcarriers.

[0155] For example, in two of the multiple TTIs, the data is transmitted in different beams.

[0156] In some embodiments, a symbol between two of the plurality of TTIs is not included in any of the plurality of TTIs.

[0157] In another general aspect, the Disclosure provides a receiving method for a receiving device that receives data from a transmitting device in a communication system, the receiving method comprising: obtaining a DMRS assignment for each of one or more subsequent TTIs following an initial transmission time interval (TTI), indicating whether a demodulation reference signal (DMRS) is assigned to the subsequent TTI so as to be received in addition to the data, wherein each of the plurality of TTIs, including the initial TTI and the one or more subsequent TTIs, contains fewer symbols than a slot, the DMRS is assigned to the initial TTI, and the data assigned to each of the plurality of TTIs is the same; and receiving from the transmitting device, within the slot, the data assigned to the initial TTI and the DMRS and the data assigned to the one or more subsequent TTIs, wherein the DMRS reception in the one or more subsequent TTIs is performed in accordance with the DMRS assignment.

[0158] For example, DMRS is not transmitted in at least one of the one or more subsequent TTIs.

[0159] In some embodiments, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by the length of one symbol corresponding to the DMRS.

[0160] In another embodiment, the DMRS assignment further indicates that if a DMRS is not assigned to the subsequent TTI, the symbol for the assignment of the DMRS in the subsequent TTI is replaced with the symbol for the assignment of the data.

[0161] In a further embodiment, the DMRS assignment further indicates that, if a DMRS is not assigned to the subsequent TTI, the length of the subsequent TTI is reduced by the length of one symbol corresponding to the DMRS, or the symbol for the assignment of the DMRS in the subsequent TTI is replaced with the symbol for the assignment of the data.

[0162] For example, if the symbols for the allocation of the DMRS in the subsequent TTI are replaced with the symbols for the allocation of the data, the data is transmitted in the subsequent TTI at a lower code rate than the code rate at which the data is transmitted in the initial TTI.

[0163] For example, the data is received from the transmitting device on the uplink, and the receiving method further includes sending a control signaling to the transmitting device for each of the one or more subsequent TTIs, which includes a DMRS assignment indicator indicating the DMRS assignment.

[0164] For example, the DMRS allocation indicator for each subsequent TTI is a 2-bit allocation indicator.

[0165] In some embodiments, the DMRS allocation indicator is included in the upper-layer signaling.

[0166] For example, the control signaling further includes an enable indicator that shows whether the DMRS is not assigned to any of the one or more subsequent TTIs.

[0167] In some exemplary embodiments, the activation indicator is included in the upper-layer signaling.

[0168] In another exemplary embodiment, the activation indicator is a 1-bit indicator included in the downlink channel information (DCI).

[0169] In some embodiments, the data is received from the transmitting device on the downlink, and the receiving method further includes receiving from the transmitting device a control signaling for each of the one or more subsequent TTIs, which includes a DMRS assignment indicator indicating the DMRS assignment, wherein in the step of obtaining, the DMRS assignment for each of the one or more subsequent TTIs is obtained by evaluating the control signaling.

[0170] For example, in two of the multiple TTIs, the data is assigned to a different set of subcarriers and received in each of the different sets of subcarriers.

[0171] For example, in two of the multiple TTIs, the data is received in different beams.

[0172] In some embodiments, a symbol between two of the plurality of TTIs is not included in any of the plurality of TTIs.

[0173] In summary, this disclosure relates to a transmitting device that transmits data to a receiving device in a communication system. The transmitting device, while in operation, includes a plurality of TTIs, including an initial transmission time interval (TTI) and one or more subsequent TTIs following the initial TTI, and further includes a circuit that assigns a demodulation reference signal (DMRS) to the initial TTI and obtains a DMRS assignment for each of the one or more subsequent TTIs, indicating whether the DMRS is assigned to that subsequent TTI so as to be transmitted in addition to the data. Each of the plurality of TTIs contains fewer symbols than a slot, and the data assigned to each of the plurality of TTIs is identical. The transmitting device, while in operation, further includes a transceiver that transmits data within a slot and transmits the DMRS according to the DMRS assignment.

Claims

1. A circuit that, during operation, allocates data repetitions and demodulation reference signals (DMRS) to time-domain resources and obtains a DMRS allocation indicating whether or not a DMRS is allocated to the time-domain resource, wherein each data repetition includes fewer consecutive symbols than the number of slots, A transceiver that, during operation, transmits the data and the DMRS to a receiving device within the slot, and which performs the transmission of the DMRS in repetitions of the data based on the DMRS assignment, Equipped with, Symbols that are not valid for uplink transmission are assigned to the symbols between the repetitions of the aforementioned data. Transmitting device.

2. The transmitting device transmits the data to the receiving device over the uplink. During operation, the transceiver further receives control signals from the receiving device, including a DMRS assignment indicator indicating the DMRS assignment for each repetition of the data. The circuit, during operation, obtains the DMRS assignment for each repeated transmission of the data by evaluating the control signaling. The transmitting device according to claim 1.

3. The aforementioned DMRS allocation indicator is included in the upper layer signaling. The transmitting device according to claim 2.

4. A circuit that, during operation, allocates data repetitions and demodulation reference signals (DMRS) to time-domain resources and obtains a DMRS allocation indicating whether or not the DMRS is allocated to the time-domain resource, wherein each data repetition includes fewer consecutive symbols than the number of slots, A transceiver that, during operation, receives the data and the DMRS from a transmitting device within the slot, and performs the reception of the DMRS in repetitions of the data based on the DMRS assignment, Equipped with, Symbols that are not valid for uplink transmission are assigned to the symbols between the aforementioned time-domain resources. Receiving device.

5. The process involves allocating data repetitions and demodulation reference signals (DMRS) to time-domain resources, wherein each data repetition includes an allocation step of fewer consecutive symbols than a slot, Obtaining a DMRS allocation indicating whether or not the DMRS is allocated to the aforementioned time domain resource, The steps of transmitting the data and the DMRS to a receiving device within the slot, and performing the transmission of the DMRS in repetitions of the data based on the DMRS assignment, Includes, Symbols that are not valid for uplink transmission are assigned to the symbols between the aforementioned time-domain resources. Sending method.

6. The process involves assigning repetitions of initial transmission data and demodulation reference signals (DMRS) to time-domain resources, and obtaining a DMRS assignment indicating whether or not the DMRS is assigned to the time-domain resource, wherein each repetition includes fewer consecutive symbols than a slot, and the process involves obtaining the assignment step. Receiving data and the DMRS from a transmitting device within the slot, and performing the receiving of the DMRS in a repetition of the data based on the DMRS assignment, Includes, Symbols that are not valid for uplink transmission are assigned to the symbols between the aforementioned time-domain resources. Reception method.

7. An integrated circuit that controls the processing of a transmitting device that transmits data to a receiving device in a communication system, wherein the processing is: A process of assigning the repeating data and demodulation reference signals (DMRS) to a time-domain resource and obtaining a DMRS assignment indicating whether or not the DMRS is assigned to the time-domain resource, wherein each repeating data includes a number of consecutive symbols less than the number of slots, and a process of obtaining this assignment. Within the aforementioned slot, a process for transmitting the data and the DMRS to the receiving device, comprising: a process for transmitting the DMRS in a repetition of the data based on the DMRS assignment; Includes, Symbols that are not valid for uplink transmission are assigned to the symbols between the aforementioned time-domain resources. Integrated circuit.

8. An integrated circuit that controls the processing of a receiving device that receives data from a transmitting device in a communication system, wherein the processing is: A process of assigning the repeating data and demodulation reference signals (DMRS) to a time-domain resource and obtaining a DMRS assignment indicating whether or not the DMRS is assigned to the time-domain resource, wherein each repeating data includes a number of consecutive symbols less than the number of slots, and a process of obtaining this assignment. A process of receiving the data and the DMRS from the transmitting device within the slot, the process of receiving the DMRS in a repetition of the data based on the DMRS assignment, Includes, Symbols that are not valid for uplink transmission are assigned to the symbols between the aforementioned time-domain resources. Integrated circuit.

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