WO2022028589A1 - Amélioration de la performance d'un procédé de répétition de pusch dans des systèmes de communication sans fil - Google Patents

Amélioration de la performance d'un procédé de répétition de pusch dans des systèmes de communication sans fil Download PDF

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Publication number
WO2022028589A1
WO2022028589A1 PCT/CN2021/111243 CN2021111243W WO2022028589A1 WO 2022028589 A1 WO2022028589 A1 WO 2022028589A1 CN 2021111243 W CN2021111243 W CN 2021111243W WO 2022028589 A1 WO2022028589 A1 WO 2022028589A1
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WIPO (PCT)
Prior art keywords
transmission
pusch
repetitions
pusch transmission
indication
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PCT/CN2021/111243
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English (en)
Inventor
Trung Kien Le
Umer Salim
Florian KALTENBERGER
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Huizhou Tcl Cloud Internet Corporation Technology Co., Ltd.
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Application filed by Huizhou Tcl Cloud Internet Corporation Technology Co., Ltd. filed Critical Huizhou Tcl Cloud Internet Corporation Technology Co., Ltd.
Priority to CN202180056671.8A priority Critical patent/CN116158159A/zh
Publication of WO2022028589A1 publication Critical patent/WO2022028589A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

  • the invention relates to methodsof enhancing performance of a PUSCH repetition Type B method used for transmission of repetitions in a Physical Uplink Shared Channel (PUSCH) transmission by a User Equipment (UE) to a base station (gNB) of a wireless communications system, in licensed and unlicensed spectrum for Ultra-Reliable and Low-Latency Communications (URLLC) with strict requirements of latency and reliability.
  • PUSCH Physical Uplink Shared Channel
  • UE User Equipment
  • gNB base station
  • URLLC Ultra-Reliable and Low-Latency Communications
  • Wireless communication systems such as the third-generation (3G) of mobile telephone standards and technology are well known.
  • 3G standards and technology have been developed by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • the 3rd generation of wireless communications has generally been developed to support macro-cell mobile phone communications.
  • Communication systems and networks have developed towards a broadband and mobile system.
  • UE User Equipment
  • RAN Radio Access Network
  • CN Core Network
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • 5G or NR new radio
  • NR is proposed to utilise an Orthogonal Frequency Division Multiplexed (OFDM) physical transmission format.
  • OFDM Orthogonal Frequency Division Multiplexed
  • the NR protocols are intended to offer options for operating in unlicensed radio bands, to be known as NR-U.
  • NR-U When operating in an unlicensed radio band the gNB and UE must compete with other devices for physical medium/resource access. For example, Wi-Fi, NR-U, and LAA may utilise the same physical resources.
  • LBT Listen Before Talk
  • a gNB or UE monitors the available resources and only commences a transmission if there is no conflict with another device already utilising the resources.
  • the gNB or UE gains access to the resources for up to the Maximum Channel Occupancy Time (MCOT) provided there is no interruption of transmissions for more than a pre-defined interval (for example 16 ⁇ s) .
  • MCOT Maximum Channel Occupancy Time
  • NR is intended to support Ultra-reliable and low-latency communications (URLLC) and massive Machine-Type Communications (mMTC) are intended to provide low latency and high reliability for small packet sizes (typically 32 bytes) .
  • URLLC Ultra-reliable and low-latency communications
  • mMTC massive Machine-Type Communications
  • a user-plane latency of 1ms has been proposed with a reliability of 99.99999%, and at the physical layer a packet loss rate of 10 -5 or 10 -6 has been proposed.
  • the node After the transmitter of the node has gained access to the channel, the node is only allowed by regulation to transmit for up to a limited duration, the MCOT, and may choose to use a COT which is equal to or only part of the duration of the MCOT for one or more transmissions.
  • the type of traffic served e.g. VoIP, video, best effort, or background
  • four LBT priority classes are defined with different CWS and MCOT.
  • the term reliability is generally defined as the success probability R of transmitting X bits within L seconds, where L is the time it takes to deliver a small data packet from the radio protocol layer 2/3 SDU ingress point to the radio protocol layer 2/3 SDU egress point of the radio interface, at a certain channel quality Q (e.g., coverage-edge) .
  • the latency bound L includestransmission latency, processing latency, retransmission latency (if any) , and queuing/scheduling latency (including scheduling request and grant reception if any) .
  • Spectral efficiency should also be considered when trying to achieve a reliability target.
  • NR defines a general URLLC reliability requirement for one transmission of a packet is 10 -5 for 32 bytes with a user plane latency of 1ms. This URLLC reliability requirement has been updated to 10 -6 for enhanced URLLC. This strict reliability requirement requires very careful design of transmit-receive techniques within a very low latency budget which can range between 0.5 to 1 msec.
  • the UE sends small PUSCH transmissions in several repetitions, which are scheduled by UL resource grant or radio resource control (RRC) in consecutive available transmission slots.
  • RRC radio resource control
  • This method is called PUSCH repetition Type A.
  • the use of such PUSCH repetitions for one transport block (TB) reduces latency and increases reliability of PUSCH transmission, where a UE can be configured to transmit a number of repetitions across consecutive transmission slots without feedback.
  • each slot contains only one TB repetition and the time domain for the repetitions of the TB is the same in each slot.
  • PUSCH repetition Type B A new method, PUSCH repetition Type B, was developed to address issues of time gaps between repetitions in PUSCH repetition Type A method.
  • repetitions are carried out in consecutive mini-slots, so one slot might contain more than one repetition of a TB.
  • the repetitions can be segmented into smaller repetitions due to a slot boundary, presence of DL symbols, presence of symbols in an invalid pattern.
  • Use of the PUSCH comprises dynamic grant (DG) and configured grant (CG) of PUSCH resources.
  • DG dynamic grant
  • CG configured grant
  • RRC signalling indicates the full time domain resource allocation including periodicity, offset, start symbol, length of PUSCH transmission and K repetitions over K slots/sub-slots (repK) , without any layer1 signalling as downlink control information (DCI) .
  • DCI downlink control information
  • type 2 CG only periodicity andrepKare given through RRC signalling.
  • the other time domain resource allocation parameters are provided through DCI activation scrambled with CS-RNTI.
  • a channel access procedure exists.
  • a transmitter of a UE is required to execute a listen before talk (LBT) procedure to check availability of a channel before transmission.
  • LBT listen before talk
  • a UE can access a channel according to Type 1 or Type 2 UL channel access defined by UL resource grant.
  • a UE senses energy of a channel over a defer time duration.
  • the length of the defer duration depends on channel access priority class, as shown in Figure 1 : 16 + 9*m p ( ⁇ s) . If energy detection is below a threshold, the channel is considered as idle in the defer duration, otherwise the channel is busy.
  • the UE After sensing an idle channel in the defer duration, the UE senses the channel for additional slots.
  • the number of additional slots (N) is chosen randomly from a uniform distribution between 0 and CWp, the value of which depends on channel priority access class, again as shown in Figure 1. Each time the UE senses the idle channel in an additional slot, it decreases N by 1. When N reaches 0, the UE transmits data.
  • Type 2 UL channel access a UE transmits data immediately after sensing the channel acquired by the gNB is idle within a duration of 16 ⁇ s (Type 2B) or 25 ⁇ s (Type 2A) . If the gap between two UL transmissions is smaller than 16 ⁇ s, the UE does not have to execute the LBT procedure before transmitting the second UL transmission.
  • the time domain resource assignment (TDRA) field in the DCI indicates the resource for the first “nominal”' repetition of the TB.
  • the time domain resources for the remaining repetitions of the TB are derived based at least on the resources for the first TB repetition and UL/DL direction of symbols.
  • the dynamic indication of the number of repetitions for DG is jointly coded with start and length indicator values (SLIV) , which indicate the start symbol and the length of PUSCH transmission, in a TDRA table using DCI formats 0_1 and 0_2, by adding an additional column for the number of repetitions in the TDRA table.
  • the maximum TDRA table size is increased to 64. For CG PUSCH transmission, if the number of repetitions is not included in the TDRA table, it is provided by RRC parameter repK.
  • the number of the PUSCH repetitions represents the “nominal” number of repetitions.
  • the actual number of repetitions might be bigger than the nominal number. If a nominal repetition encounters a slot boundary or the presence of DL symbols in a time division duplex (TDD) configuration, this repetition is fragmented into multiple actual repetitions.
  • TDD time division duplex
  • FIG. 2 shows two scenarios of UL transmission in a TDD configuration.
  • the UE is scheduled by the gNB to transmit four nominal TB repetitions using thePUSCH repetition Type B method (DG or CG transmission) .
  • the time window within which valid symbols are used for transmission is K x L where K is four nominal repetitions and L is the length of a nominal repetition.
  • the UE Before the transmission, the UE must execute a LBT Type 1 procedure to acquire the channel and it is allowed to use this channel for a Channel Occupancy Time (COT) duration.
  • COT Channel Occupancy Time
  • scenario 1 of Figure 2 there are four consecutive UL sub-slots so the UE can transmit the whole four repetitions without an interruption, after successful execution of a LBT Type 1 procedure.
  • the UL transmission is interrupted because of the presence of DL symbols in the middle of the second repetition.
  • the UE cannot transmit UL data in a DL transmission occasion, so the second repetition is fragmented into two actual repetitions.
  • SCS from 15 kHz to 120 kHz and a sub-slot of 2, 4, 7 symbols, the time length of the DL sub-slot is larger than 16 ⁇ s.
  • DL symbols are configured in a semi-static way in advance.
  • the gNB does not have DL data to transmit at those semi-static DL symbols, there will be a gap between two UL bursts.
  • the UE must execute an additional LBT procedure, a LBT Type 2 procedure, to continue to transmit the remaining repetitions in the UE-initiated COT.
  • This COT is initiated by the LBT Type 1 procedure before the first repetition.
  • the additional LBT Type 2 procedure consumes at least 25 ⁇ s.
  • This LBT procedure time can be more than 25 ⁇ s if the channel is busy.
  • the time window K x L is fixed, so an increase of LBT procedure time reduces the time for data transmission.
  • the UE transmits less data in the repetition than is configured, which causes a decrease of reliability.
  • the UL repetitions must be scheduled in the UL transmission resources, segmented by the DL sub-slots, to satisfy the URLLC latency budget of 1 ms, the UL repetition transmission cannot wait for the next available four consecutive UL sub-slots for transmission of all of the repetitions.
  • the presence of DL symbols in the middle of PUSCH repetitions also reduces the number of valid symbols for PUSCH transmission that the UE can use in the time window K x L. This affects the reliability of UL transmission of a TB.
  • Gaps in the transmission of UL TB repetitions is also caused by encountering a slot boundary, even if a nominal repetition is fragmented into two actual repetitions.
  • two repetitions of a TB are scheduled using the PUSCH repetition Type B method. Each repetition has four symbols. After the first repetition, the second repetition is fragmented by the slot boundary between slot 1 and slot 2. There is one symbol of the second repetition in slot 1 and 3 symbols in slot 2. However, repetitionshaving a single symbol are not transmitted. Thus, the UE does not transmit a repetition in the last symbol of slot 1 so this symbol is empty. The UE only starts to transmit the second repetition from the first symbol of slot 2. This creates a gap of one symbol between the two repetitions.
  • the length of a symbol is larger than 16 ⁇ s. Therefore, in unlicensed spectrum, at least, execution of a LBT procedure of 25 ⁇ s is needed before the transmission of the second repetition. This causes LBT overhead and reduces the time interval in which the UE can transmit the second repetition.
  • a method of enhancing performance of a physical uplink shared channel (PUSCH) repetition Type B method used for repetitions in a PUSCH transmission by a user equipment (UE) to a base station gNB of a wireless communications network comprising: scheduling by the gNB resources and number of repetitions in the PUSCH transmission; establishing by the gNB an indication of listen before talk (LBT) process adopted on interruption of the PUSCH transmission; receiving by the UE the scheduled resources and number of repetitions in the PUSCH transmission; receiving by the UE the indication of LBT process adopted on interruption of the PUSCH transmission; executing by the UE a LBT procedure to acquire the PUSCH; proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method; when an interruption of transmission of the repetitions in the PUSCH transmission is encountered, the indication of LBT process adopted on interruption of the PUSCH transmission causing the UE to proceed with transmission of the repetitions in the PUSCH transmission using the PUSCH
  • the method may be used for PUSCH transmissions of ultra-reliable, low-latency communications (URLLC) having high priority.
  • URLLC ultra-reliable, low-latency communications
  • the indication of LBT process may be adopted on interruption of the PUSCH transmission comprises an explicit signal for the indication.
  • the explicit signal for the indication may comprise any of a value of an additional bit in downlink control information (DCI) sent by the gNB to the UE, an additional parameter in radio resource control (RRC) signalling.
  • DCI downlink control information
  • RRC radio resource control
  • the indication of LBT process may be adopted on interruption of the PUSCH transmission comprises an implicit signal for the indication.
  • the implicit signal for the indication may comprise a high value of a priority index for the PUSCH transmission.
  • the method may be used when the interruption of transmission of the repetitions in the PUSCH transmission is caused by the presence of DL symbols during transmission of the repetitions and the indication of LBT process adopted on interruption of the PUSCH transmission caused by the presence of DL symbols comprises an explicit signal comprising any of a value of an additional bit in DCI sent by the gNB to the UE, an additional parameter in RRC signalling.
  • the method may be used when the interruption of transmission of the repetitions in the PUSCH transmission is caused by the presence of invalid symbols during transmission of the repetitions and the indication of LBT process adopted on interruption of the PUSCH transmission caused by the presence of invalid symbols comprises an explicit signal comprising any of a value of an additional bit in DCI sent by the gNB to the UE, an additional parameter in RRC signalling.
  • the method may be used when the interruption of transmission of the repetitions in the PUSCH transmission is caused by a slot boundary producing a one-symbol repetition and the indication of LBT process adopted on interruption of the PUSCH transmission caused by a slot boundary producing a one-symbol repetition comprises an explicit signal comprising any of a value of an additional bit in DCI sent by the gNB to the UE, an additional parameter in RRC signalling.
  • the indication of LBT process may be adopted on interruption of the PUSCH transmission comprises an explicit signal comprising a value of a first additional bit in DCI for interruption caused by any of the presence of DL symbols, the presence of invalid symbols and a value of a second additional bit in DCI for interruption caused by a slot boundary producing a one-symbol repetition.
  • the indication of LBT process may be adopted on interruption of the PUSCH transmission comprises an explicit signal comprising a first additional parameter in RRC signalling for interruption caused by any of the presence of DL symbols, the presence of invalid symbols and a second additional parameter in RRC signalling for interruption caused by a slot boundary producing a one-symbol repetition.
  • a method of enhancing performance of a PUSCH repetition Type B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network comprising: scheduling by the gNB resources and number of repetitions in the PUSCH transmission; establishing by the gNB an indication of transmission process adopted on occurrence of a one-symbol repetition; receiving by the UE the scheduled resources and number of repetitions in the PUSCH transmission; receiving by the UE the indication of transmission process adopted on occurrence of a one-symbol repetition; executing by the UE a LBT procedure to acquire the PUSCH; proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method; on occurrence of a one-symbol repetition, the indication of transmission process adopted on occurrence of a one-symbol repetition causing the UE to proceed with transmission of the one- symbol repetition and further repetitions in the PUSCH transmission using the PUSCH repetition Type
  • the method may be used for PUSCH transmissions of URLLC having high priority.
  • the one-symbol repetition may contain DMRS.
  • the indication of transmission process may be adopted on occurrence of a one-symbol repetition comprises an explicit signal for the indication.
  • the explicit signal for the indication may comprise any of a value of an additional bit in DCI sent by the gNB to the UE, an additional parameter in RRC signalling.
  • the indication transmission process may be adopted on occurrence of a one-symbol repetition comprises an implicit signal for the indication comprising a high value of a priority index for the PUSCH transmission.
  • a method of enhancing performance of a PUSCH repetition Type B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network comprising: scheduling by the gNB resources and number of repetitions in the PUSCH transmission; establishing by the gNB an indication of process adopted on occurrence of a one-symbol repetition; receiving by the UE the scheduled resources and number of repetitions in the PUSCH transmission; receiving by the UE the indication of process adopted on occurrence of a one-symbol repetition; executing by the UE a LBT procedure to acquire the PUSCH; proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method; on occurrence of a one-symbol repetition, the indication of process adopted on occurrence of a one-symbol repetition causing the UE to execute an additional LBT procedure in a time interval of the one-symbol repetition.
  • the time interval of the one-symbol repetition and the additional LBT procedure may equal a time interval for one OFDM symbol and the time interval of the additional LBT procedure may be configured to fit within the time interval for the one OFDM symbol.
  • a method of enhancing performance of a PUSCH repetition Type B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network comprising: scheduling by the gNB resources , number of repetitions and DL symbols in the PUSCH transmission; establishing by the gNB an indication of transmission process adopted on interruption of the PUSCH transmission; receiving by the UE the scheduled resources, number of repetitions and DL symbols in the PUSCH transmission; receiving by the UE the indication of transmission process adopted on interruption of the PUSCH transmission; executing by the UE a LBT procedure to acquire the PUSCH (in unlicensed spectrum) ; proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method; when an interruption of transmission of the repetitions in the PUSCH transmission is encountered, the indication of transmission process adopted on interruption of the PUSCH transmission causing the UE to switch at least some of the DL symbols to UL symbols and proceed with transmission of the repetition
  • the indication of transmission process may be adopted on interruption of the PUSCH transmission causes the UE to switch all of the DL symbols to UL symbols when the gNB has no DL data to transmit by means of the DL symbols.
  • the indication of transmission process may be adopted on interruption of the PUSCH transmission causes the UE to switch all of the DL symbols to UL symbols when the gNB has DL data to transmit by means of the DL symbols and UL data of the repetitions has higher priority than the DL data.
  • the indication of transmission process may be adopted on interruption of the PUSCH transmission comprises any of a dynamic SFI signal sent to the UE, a value of an additional bit of a DCI for UL resource grant, a high value of a priority index for the PUSCH transmission.
  • the indication of transmission process may be adopted on interruption of the PUSCH transmission comprises any of a high value of a priority index for the PUSCH transmission, a DCI format 2_0.
  • a method of enhancing performance of a PUSCH repetition Type B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network comprising: scheduling by the gNB resources and number of repetitions in the PUSCH transmission; establishing by the gNB an indication of transmission process adopted on interruption of the PUSCH transmission; receiving by the UE the scheduled resources and number of repetitions in the PUSCH transmission; receiving by the UE the indication of transmission process adopted on interruption of the PUSCH transmission; executing by the UE a LBT procedure to acquire the PUSCH (in unlicensed spectrum) ; proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method; when an interruption of transmission of the repetitions in the PUSCH transmission is encountered, the indication of transmission process adopted on interruption of the PUSCH transmission causing the UE to proceed with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method by means of semi-static flexible
  • a UE configured to perform any of the methods described above.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • Figure 1 shows channel access priority classes for UL.
  • Figure 2 shows two scenarios of UL transmission in a TDD configuration.
  • Figure 3 shows interruption in the transmission of UL repetitions due to a slot boundary.
  • Figure 4 shows a schematic diagram of three base stations forming a cellular network.
  • Figure 5 shows interruption of transmission of repetitions in a PUSCH transmission caused by DL symbols.
  • Figure 6 shows interruption of transmission of repetitions in a PUSCH transmission caused by a slot boundary producing a one-symbol repetition.
  • Figure 7 shows transmissionof a one-symbol repetition.
  • Figure 8 shows witching of DL symbols to UL symbols for use in the transmission of repetitions in a PUSCH transmission.
  • FIG. 4 shows a schematic diagram of three base stations (for example, eNB or gNBs depending on the particular cellular standard and terminology) forming a cellular network.
  • each of the base stations will be deployed by one cellular network operator to provide geographic coverage for UEs in the area.
  • the base stations form a Radio Area Network (RAN) .
  • RAN Radio Area Network
  • Each base station provides wireless coverage for UEs in its area or cell.
  • the base stations are interconnected via the X2 interface and are connected to the core network via the S1 interface.
  • the base stations each comprise hardware and software to implement the RAN’s functionality, including communications with the core network and other base stations, carriage of control and data signals between the core network and UEs, and maintaining wireless communications with UEs associated with each base station.
  • the core network comprises hardware and software to implement the network functionality, such as overall network management and control, and routing of calls and data.
  • a method is provided of enhancing performance of a PUSCH repetitionType B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network, the method comprising scheduling by the gNB resources and number of repetitions in the PUSCH transmission, establishing by the gNB an indication of LBT process adopted on interruption of the PUSCH transmission, receiving by the UE the scheduled resources and number of repetitions in the PUSCH transmission, receiving by the UE the indication of LBT processadopted on interruption of the PUSCH transmission, executingby the UE a LBT procedure to acquire the PUSCH, proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method, when an interruption of transmission of the repetitions in the PUSCH transmission is encountered, the indication of LBT process adopted on interruption of the PUSCH transmission causing the UE to proceed with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B methodwithout execution
  • the method is used for PUSCH transmissionshaving high priority such as URLLC.
  • the indication of LBT process adopted on interruption of the PUSCH transmission comprises an explicit signal for the indication.
  • the explicit signal for the indication comprises a value of an additional bit in downlink control information (DCI) sent by the gNB to the UE.
  • DCI downlink control information
  • DG dynamic grant
  • CG configured grant
  • Type 2 of PUSCH resources the additional bit is added to the DCIto activate a CG configuration.
  • the explicit signal for the indication comprises an additional parameter in radio resource control (RRC) signalling.
  • RRC radio resource control
  • the indication of LBT process adopted on interruption of the PUSCH transmission comprises an implicit signal for the indication.
  • the implicit signal for the indication comprises ahigh valueof a priority index for the PUSCH transmission.
  • the high value of the priority index for the PUSCH transmission is indicated by a1 bit priority field in the DCI for the UL resource grant.
  • the high value of the priority index for the PUSCH transmission is indicated by a RRC parameter or an activation DCI.
  • the method is used when the interruption of transmission of the repetitions in the PUSCH transmission is caused by the presence of DL symbols during transmission of the repetitions.
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission caused by the presence of DL symbols comprises a value of an additional bit in downlink control information (DCI) sent by the gNB to the UE.
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission caused by the presence of DL symbols comprises an additional parameter in radio resource control (RRC) signalling.
  • RRC radio resource control
  • DL symbols may be configured in a semi-static way in advance. If the gNB does not have DL data to transmit at those semi-static DL symbols, there will be a transmission interruption or gap between transmission of repetitions before the empty DL symbols and transmission of repetitions after the empty DL symbols. A repetition may be segmented into two repetitions due to the empty semi-static DL symbols. If the transmission gap is bigger than 16 ⁇ s, the UE must execute an additional LBT procedure before continuing transmission of the repetitions. The gap of 16 ⁇ s is a value defined by the current standard. If the value of the gap is changed by the future standards, the method is still applicable.
  • the invention sendsan indication of LBT process adopted on interruption of the PUSCH transmission from the gNB to the UE.
  • the LBT process causes the UE to proceed with transmission of the repetitions after the interruption of their transmission caused by the presence of DL symbols without execution of the additional LBT procedure. This is shown in scenario 2 of Figure 5, when transmission of a repetition is segmented into transmission of two repetitions due to empty semi-static DL symbols, the UE proceeds with transmission of Rep 3 without executionof the LBT procedure.
  • the method is used when the interruption of transmission of the repetitions in the PUSCH transmission is caused by the presence of invalid symbols during transmission of the repetitions.
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission caused by the presence of invalid symbols comprises a value of an additional bit in downlink control information (DCI) sent by the gNB to the UE.
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission caused by the presence of invalid symbols comprises an additional parameter in radio resource control (RRC) signalling.
  • RRC radio resource control
  • the presence of invalid symbols is indicated by an InvalidSymbolPattern parameter.
  • the InvalidSymbolPatternparameter may be a RRC parameter and/or an activation DCI parameter. Configuration and activation of the InvalidSymbolPattern parameter causes interruption of the PUSCH transmission, especially for CG transmission, as the gNB cannot predict arriving data at the UE for the whole active time of the CG configuration and cannot avoid conflict between invalid symbols and UL PUSCH transmission.
  • the principle of the method may be extended to DL transmission in TDD configuration. If a DL transmission with high priority is segmented by UL symbols, the gNB carries out LBT process where it does not do an additional LBT procedure before resuming the DL transmission in case the UL symbols are empty.
  • the method is used when the interruption of transmission of the repetitions in the PUSCH transmission is caused by a slot boundary producing a one-symbol repetition.
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission caused by a slot boundary producing a one-symbol repetition comprises a value of an additional bit in downlink control information (DCI) sent by the gNB to the UE. This can be applied to DG transmission and CG Type 2 transmission.
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission caused by a slot boundary producing a one-symbol repetition comprises an additional parameter in radio resource control (RRC) signalling. This can be applied to DG transmission and CG Type 1 and Type 2 transmission.
  • RRC radio resource control
  • the gNB When the gNB schedules resources and the number of repetitions to the UE, the gNB knows about the generation of one-symbol repetitions by the location of resources of the repetitions with respect to the slot boundaries. The gNB therefore knows about interruption of the transmission of repetitions in the PUSCH transmission and sends an indication of LBT process adopted on interruption of the PUSCH transmission to the UE. This causes the UE to proceed with transmission of the repetitions after the interruption of their transmission caused by a slot boundary producing a one-symbol repetitionwithout execution of the additional LBT procedure. This is illustrated in Figure 6.
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission caused by any of the presence of DL symbols, the presence of invalid symbols, a slot boundary producing a one-symbol repetition comprises a value of an additional bit in downlink control information (DCI) sent by the gNB to the UE.
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission caused by any of the presence of DL symbols, the presence of invalid symbols, a slot boundary producing a one-symbol repetition comprises an additional parameter in radio resource control (RRC) signalling.
  • RRC radio resource control
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission comprises a value of a first additional bit in downlink control information (DCI) for interruption caused by any of the presence of DL symbols, the presence of invalid symbols and a value of a second additional bit in downlink control information (DCI) for interruption caused bya slot boundary producing a one-symbol repetitionsent by the gNB to the UE.
  • DCI downlink control information
  • the explicit signal for the indication of LBT process adopted on interruption of the PUSCH transmission comprises a first additional parameter in radio resource control (RRC) signalling for interruption caused by any of the presence of DL symbols, the presence of invalid symbols and a second additional parameter in radio resource control (RRC) signalling for interruption caused by a slot boundary producing a one-symbol repetition sent by the gNB to the UE.
  • RRC radio resource control
  • execution of an additional LBT procedure is not required, i.e. is skipped, after aninterruption in transmission of repetitionsin the PUSCH transmission, due to any of the DL symbols or invalid symbols or a slot boundary.
  • the LBT-skip indication signal is indicated by the gNB to the UE by using an additional bit in DCI, RRC or an association with the priority index in the DCI. Thisembodiment is most suitable for unlicensed spectrum.
  • a method is provided of enhancing performance of a PUSCH repetition Type B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network, the method comprising scheduling by the gNB resources and number of repetitions in the PUSCH transmission, establishing by the gNB an indication of transmission process adopted on occurrence of a one-symbol repetition, receiving by the UE the scheduled resources and number of repetitions in the PUSCH transmission, receiving by the UE the indication oftransmission process adopted on occurrence of a one-symbol repetition, executing by the UE a LBT procedure to acquire the PUSCH, proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method, on occurrence of a one-symbol repetition, the indication of transmission process adopted on occurrence of a one-symbol repetition causing the UE to proceed with transmission of the one-symbol repetition and further repetitions in
  • the UE transmits the one-symbol repetition so the transmission of repetitions in the PUSCH transmission is continuous. Execution of a LBT procedure after occurrence of a one-symbol repetition is not required. This is shown in Figure 7. Transmission by the UE of the one-symbol repetition keepsthe PUSCH resource and the UE can therefore transmit immediately further repetitions in the PUSCH transmission.
  • the method of the second aspect of the invention is used for PUSCH transmissions having high priority such as URLLC.
  • the one-symbol repetition contains a signal to ensure a continuous transmission among the repetitions.
  • One of the signals that can be used in the one-symbol repetition is DMRS.
  • the transmitted DMRS one-symbol repetition is not taken account in the calculation of an RV sequence of the repetitions.
  • the transmission of DMRS one-symbol repetitions provides the UE with an opportunity to perform channel estimation and improves the performance of high priority UL transmission.
  • the DMRS one-symbol repetition does not contain data, it is not taken into account in the calculation of an RV sequence of the repetitions. In other words, the DMRS one-symbol repetition is transmitted but is not considered as an actual repetition.
  • the indication of transmission process adopted on occurrence of a one-symbol repetition comprises an explicit signal for the indication.
  • the explicit signal for the indication comprises a value of an additional bit in downlink control information (DCI) sent by the gNB to the UE.
  • the explicit signal for the indication comprises an additional parameter in radio resource control (RRC) signalling.
  • RRC radio resource control
  • the indication comprises a value of an additional bit in downlink control information (DCI) for UL resource grant.
  • the value of the additional bit causes the UE to transmit a signal such as DMRS in the one-symbol repetition.
  • the indication comprises an additional parameter in radio resource control (RRC) signalling.
  • the value of the additional parameter causes the UE to transmit a signal such asDMRS in the one-symbol repetition.
  • the indication comprises an additional bit in an activation downlink control information (DCI) .
  • DCI activation downlink control information
  • the indication transmission process adopted on occurrence of a one-symbol repetition comprises an implicit signal for the indication.
  • the implicit signal for the indication comprises a high value of a priority index for the PUSCH transmission.
  • the high value of the priority index for the PUSCH transmission is indicated by a 1 bit priority field in the DCI for the UL resource grant.
  • the high value of the priority index for the PUSCH transmission is indicated by a RRC parameter or an activation DCI.
  • a method is provided of enhancing performance of a PUSCH repetition Type B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network, the method comprising scheduling by the gNB resources and number of repetitions in the PUSCH transmission, establishing by the gNB an indication of process adopted on occurrence of a one-symbol repetition, receiving by the UE the scheduled resources and number of repetitions in the PUSCH transmission, receiving by the UE the indication of process adopted on occurrence of a one-symbol repetition, executing by the UE a LBT procedure to acquire the PUSCH, proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method, on occurrence of a one-symbol repetition, the indication of process adopted on occurrence of a one-symbol repetition causing the UE to execute an additional LBT procedure in a time interval of the one-symbol repetition.
  • the time interval of the one-symbol repetition and the additional LBT procedure equals a time interval for one OFDM symbol.
  • the time between the end of the additional LBT procedure and the beginning of the next repetition transmission is less than 16 ⁇ s.
  • the time interval of the additional LBT procedure is configured to fit within the time interval for the one OFDM symbol.
  • the time interval of theadditional LBT procedure is a function of sub-carrier spacing (SCS) which is pre-configured between the gNB and the UE.
  • SCS sub-carrier spacing
  • a method is provided of enhancing performance of a PUSCH repetition Type B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network, the method comprising scheduling by the gNB resources , number of repetitions and DL symbols in the PUSCH transmission, establishing by the gNB an indication of transmission process adopted on interruption of the PUSCH transmission, receiving by the UE the scheduled resources, number of repetitions and DL symbols in the PUSCH transmission, receiving by the UE the indication of transmission process adopted on interruption of the PUSCH transmission, executing by the UE a LBT procedure to acquire the PUSCH (in unlicensed spectrum) , proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method, when an interruption of transmission of the repetitions in the PUSCH transmission is encountered, the indication of transmission process adopted on interruption of the PUSCH transmission causing the UE to switch at least some of the DL symbols to UL
  • DL symbols can be configured in a semi-static way so that the gNB can transmit DL data (using PDCCH, PDSCH, SSB) .
  • the gNB may also schedule PUSCH transmission with repetitions that are segmented by semi-static DL symbols. This causes interruption of the transmission of the repetitions in the PUSCH transmission segmentation of the PUSCH repetitions. This occurs even if the gNB has no DL data to transmit using the semi-static DL symbols in the PUSCH transmission.
  • scenario 1 of Figure 8 The DL symbols are scheduled in a semi-static way in advance, so the gNB does not know whether it has DL data to transmit using the semi-static DL symbols.
  • the indication of transmission process adopted on interruption of the PUSCH transmission causes the UE to switch all of the DL symbols to UL symbols when the gNB has no DL data to transmit by means of the DL symbols.
  • the gNB When the gNB schedules the repetitions in the PUSCH transmission, if it recognizes that it does not have DL data to transmit by means of the DL symbols, it causes the UE to switch all of the (empty) semi-static DL symbols to UL symbols. This is shown in scenario 2 of Figure 8, which shows transmission in unlicensed spectrum.
  • the UE can transmit PUSCH repetitions without interruption or segmentation, so that the valid symbols for UL transmission is ensured to be K x L, and 2) there is no execution of an additional LBT procedure due to the interruption.
  • Switching of the empty semi-static DL symbols to UL symbols is also applied to the PUSCH repetitions in licensed spectrum, so that the UE can transmit all repetitions as configured in the time window to guarantee reliability.
  • the indication of transmission process adopted on interruption of the PUSCH transmission causes the UE to switch all of the DL symbols to UL symbolswhen the gNB has DL data to transmit by means of the DL symbols and UL data of the repetitions has higher priority than the DL data.
  • the gNB When the gNB has DL data to transmit by means of the semi-static DL symbols, if the UL data has higher priority than the DL data, the gNB causes the UE to switch the semi-static DL symbols to UL symbols and delays DL data transmission to a next available occasion so that the UE can transmit continuous high priority UL data.
  • Switching of the DL symbols to UL symbols is applied to both DG and CG transmission.
  • the indication of transmission process adopted on interruption of the PUSCH transmission comprises a dynamic SFI signal sent to the UE.
  • the dynamic SFI signal is a DCI format 2_0.
  • the indication of transmission process adopted on interruption of the PUSCH transmission comprises a value of an additional bit of a DCI for UL resource grant.
  • the indication of transmission process adopted on interruption of the PUSCH transmission comprises a high value of a priority index for the PUSCH transmission.
  • the high value of the priority index for the PUSCH transmission is indicated by a 1 bit priority field in the DCI for the UL resource grant.
  • the high value of the priority index for the PUSCH transmission is indicated by a RRC parameter or an activation DCI.
  • the indication of transmission process adopted on interruption of the PUSCH transmission comprises a dynamic SFI signal.
  • the dynamic SFI signal may be a DCI format 2_0.
  • the gNB can periodically send the DCI format 2_0.
  • the period of sending the DCI format 2_0 depends on priority of the CG configurations, the arrival rate of UL data at the UE using the configurations and the arrival rate of DL data at the gNB.
  • This method can be extended to switch semi-static UL symbols to DL symbols.
  • the gNB can then switch semi-static UL symbols to DL symbols for use in DL transmission. This is useful when the gNB has a high arrival rate of URLLC DL data and needs to use the switched symbols to meet URLLC requirements for DL transmission.
  • the gNB sends a dynamic SFI signal to notify the UE to switchthe semi-static UL symbols to DL symbols, so that the UE decodes DL transmission in these symbols instead of transmitting UL data.
  • DL symbols in the middle of URLLC PUSCH repetitions that cause interruption of transmission of repetitions are switched to UL symbols using a dynamic signal (an additional bit in DCI, RRC or an association with priority index in DCI/RRC) from the gNB.
  • a dynamic signal an additional bit in DCI, RRC or an association with priority index in DCI/RRC
  • the interruption of the URLLC PUSCH repetitions is eliminated, so LBT overhead in unlicensed spectrum is also eliminated to reduce latency.
  • the UE can guarantee transmissionof the repetitions as configured in the scheduled time window to achieve reliability requirements.
  • a method is provided of enhancing performance of a PUSCH repetition Type B method used for repetitions in a PUSCH transmission by a UE to a gNB of a wireless communications network, the method comprising scheduling by the gNB resources and number of repetitions in the PUSCH transmission, establishing by the gNB an indication of transmission process adopted on interruption of the PUSCH transmission, receiving by the UE the scheduled resources and number of repetitions in the PUSCH transmission, receiving by the UE the indication of transmission process adopted on interruption of the PUSCH transmission, executing by the UE a LBT procedure to acquire the PUSCH (in unlicensed spectrum) , proceeding by the UE with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B method, when an interruption of transmission of the repetitions in the PUSCH transmission is encountered, the indication of transmission process adopted on interruption of the PUSCH transmission causing the UE to proceed with transmission of the repetitions in the PUSCH transmission using the PUSCH repetition Type B
  • the UE uses semi-static flexible symbols in the scheduled resource as UL symbols to transmit the repetitions without any interruption. In other words, a repetition is not fragmented around the semi-static flexible symbols or dropped because of conflict with the semi-static flexible symbols. Therefore, in unlicensed spectrum, execution of an additional LBT procedure is not required during the transmission of the PUSCH repetitions. Moreover, in both licensed and unlicensed spectrum, the configured number of repetitions is ensured.
  • the various embodiments of the invention have the following advantages: reduction of LBT latency, increase in the time that the UE transmits data, increase in the UL transmission reliability, elimination of the gap between repetition transmissions, avoidance of dropping of CG PUSCH repetitions in the case of conflict with semi-static flexible symbols.
  • any of the devices or apparatus that form part of the network may include at least a processor, a storage unit and a communications interface, wherein the processor unit, storage unit, and communications interface are configured to perform the method of any aspect of the present invention. Further options and choices are described below.
  • the signal processing functionality of the embodiments of the invention especially the gNB and the UE may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptop or notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can be used.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • the computing system can also include a main memory, such as random access memory (RAM) or other dynamic memory, for storing information and instructions to be executed by a processor. Such a main memory also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor.
  • the computing system may likewise include a read only memory (ROM) or other static storage device for storing static information and instructions for a processor.
  • ROM read only memory
  • the computing system may also include an information storage system which may include, for example, a media drive and a removable storage interface.
  • the media drive may include a drive or other mechanism to support fixed or removable storage media, such as a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a compact disc (CD) or digital video drive (DVD) read or write drive (R or RW) , or other removable or fixed media drive.
  • Storage media may include, for example, a hard disk, floppy disk, magnetic tape, optical disk, CD or DVD, or other fixed or removable medium that is read by and written to by media drive.
  • the storage media may include a computer-readable storage medium having particular computer software or data stored therein.
  • an information storage system may include other similar components for allowing computer programs or other instructions or data to be loaded into the computing system.
  • Such components may include, for example, a removable storage unit and an interface , such as a program cartridge and cartridge interface, a removable memory (for example, a flash memory or other removable memory module) and memory slot, and other removable storage units and interfaces that allow software and data to be transferred from the removable storage unit to computing system.
  • the computing system can also include a communications interface.
  • a communications interface can be used to allow software and data to be transferred between a computing system and external devices.
  • Examples of communications interfaces can include a modem, a network interface (such as an Ethernet or other NIC card) , a communications port (such as for example, a universal serial bus (USB) port) , a PCMCIA slot and card, etc.
  • Software and data transferred via a communications interface are in the form of signals which can be electronic, electromagnetic, and optical or other signals capable of being received by a communications interface medium.
  • computer program product may be used generally to refer to tangible media such as, for example, a memory, storage device, or storage unit.
  • These and other forms of computer-readable media may store one or more instructions for use by the processor comprising the computer system to cause the processor to perform specified operations.
  • Such instructions generally 45 referred to as ‘computer program code’ (which may be grouped in the form of computer programs or other groupings) , when executed, enable the computing system to perform functions of embodiments of the present invention.
  • the code may directly cause a processor to perform specified operations, be compiled to do so, and/or be combined with other software, hardware, and/or firmware elements (e.g., libraries for performing standard functions) to do so.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • the software may be stored in a computer-readable medium and loaded into computing system using, for example, removable storage drive.
  • a control module (in this example, software instructions or executable computer program code) , when executed by the processor in the computer system, causes a processor to perform the functions of the invention as described herein.
  • inventive concept can be applied to any circuit for performing signal processing functionality within a network element. It is further envisaged that, for example, a semiconductor manufacturer may employ the inventive concept in a design of a stand-alone device, such as a microcontroller of a digital signal processor (DSP) , or application-specific integrated circuit (ASIC) and/or any other sub-system element.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • aspects of the invention may be implemented in any suitable form including hardware, software, firmware or any combination of these.
  • the invention may optionally be implemented, at least partly, as computer software running on one or more data processors and/or digital signal processors or configurable module components such as FPGA devices.
  • an embodiment of the invention may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units.
  • the present invention has been described in connection with some embodiments, it is not intended to be limited to the specific form set forth herein. Rather, the scope of the present invention is limited only by the accompanying claims. Additionally, although a feature may appear to be described in connection with particular embodiments, one skilled in the art would recognise that various features of the described embodiments may be combined in accordance with the invention. In the claims, the term ‘comprising’ does not exclude the presence of other elements or steps.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un procédé d'amélioration de la performance d'un procédé de répétition de canal partagé de liaison montante physique, PUSCH, de type B utilisé pour des répétitions dans une transmission PUSCH par un UE vers une station de base d'un réseau de communication sans fil est divulgué. Le procédé est mis en œuvre par l'UE et le procédé fait appel aux étapes suivantes : la réception de ressources planifiées et d'un nombre de répétitions dans la transmission PUSCH; la réception d'une indication d'un processus adopté lors de la survenue d'une répétition à symbole unique; l'exécution d'une procédure « écouter avant de parler » afin d'acquérir le PUSCH; la réalisation de la transmission des répétitions dans la transmission PUSCH au moyen du procédé de répétition PUSCH de type B; et l'exécution, lors de la survenue d'une répétition à symbole unique et sur la base de l'indication, d'une procédure « écouter avant de parler » supplémentaire dans un intervalle de temps de la répétition à symbole unique.
PCT/CN2021/111243 2020-08-06 2021-08-06 Amélioration de la performance d'un procédé de répétition de pusch dans des systèmes de communication sans fil WO2022028589A1 (fr)

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US11996942B2 (en) * 2020-10-16 2024-05-28 Intel Corporation Repetition schemes for URLLC operating in unlicensed spectrum

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