WO2019218142A1 - Transmission de rs améliorée pour une rlm dans un spectre sans licence nr - Google Patents

Transmission de rs améliorée pour une rlm dans un spectre sans licence nr Download PDF

Info

Publication number
WO2019218142A1
WO2019218142A1 PCT/CN2018/086847 CN2018086847W WO2019218142A1 WO 2019218142 A1 WO2019218142 A1 WO 2019218142A1 CN 2018086847 W CN2018086847 W CN 2018086847W WO 2019218142 A1 WO2019218142 A1 WO 2019218142A1
Authority
WO
WIPO (PCT)
Prior art keywords
reference signals
time window
successful
current cycle
unlicensed spectrum
Prior art date
Application number
PCT/CN2018/086847
Other languages
English (en)
Inventor
Yan Meng
Tao Tao
Jianguo Liu
Zhe LUO
Zhuo WU
Gang Shen
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to CN201880095664.7A priority Critical patent/CN112425248B/zh
Priority to PCT/CN2018/086847 priority patent/WO2019218142A1/fr
Publication of WO2019218142A1 publication Critical patent/WO2019218142A1/fr

Links

Images

Classifications

    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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]

Definitions

  • This invention relates generally to wireless communications and, more specifically, relates to reference signal usage in the unlicensed spectrum.
  • the UE For the purpose of monitoring downlink radio link quality to indicate out-of-sync/in-sync status indications to higher layers, the UE shall measure the reference signal (RS) and compare it to the thresholds Qout and Qin. See, e.g., 3GPP TS 36.133 V15.2.0 (2018-03) .
  • the physical layer in the UE shall send an out-of-sync (OOS) indication to higher layers.
  • OOS out-of-sync
  • the physical layer in the UE shall send an in-sync (IS) indication to higher layers. Therefore, the RS measurement is a crucial function of radio link monitoring (RLM) at the physical layer.
  • the RS measurement depends on the RS design and transmission.
  • LTE long term evolution
  • the physical layer in the UE shall monitor the downlink quality based on the cell-specific reference signals (CRSs) , which are transmitted at each downlink (DL) sub-frame, and assess the radio link quality per every radio frame.
  • CRSs cell-specific reference signals
  • SSB Synchronization Signal block
  • CSI-RS Channel Status Information Reference Signal
  • the RLM-RS resources are UE-specific RRC configured.
  • the RLM-RS resources can be UE-specific or cell-specific RRC configured. Both of these two RLM-RS are transmitted periodically. So, the UE shall monitor the downtink quality based on the SSB or CSI-RS, and assess the downlink radio link quality per every cycle in an NR system.
  • a device Before transmission on an unlicensed carrier, a device shall apply Listen before Talk (LBT) to ensure the target carrier is clear before accessing the unlicensed carrier. Transmission of RLM-RS may be blocked due to LBT failure, which leads to the inefficiency of RLM measurement.
  • LBT Listen before Talk
  • MF MultiFire
  • DRS discovery RS
  • DTxW DRS transmission window
  • An exemplary embodiment is a method, comprising: determining by a base station whether a listen-before-talk process, performed in a current cycle, is successful for an unlicensed spectrum; and responsive to the determining, performing by the base station one of the following: in response to the listen-before-talk process being successful, transmitting one or more first reference signals over the unlicensed spectrum at a predetermined position in the current cycle; or in response to the listen-before-talk process not being successful, attempting to transmit one or more second reference signals over the unlicensed spectrum within a time window in the current cycle, based on at least one other listen-before-talk process run within the time window of the current cycle.
  • An additional exemplary embodiment includes a computer program, comprising code for performing the method of the previous paragraph, when the computer program is run on a processor.
  • An exemplary apparatus includes one or more processors and one or more memories including computer program code.
  • the one or more memories and the computer program code are configured to, with the one or more processors, cause the apparatus to perform at least the following: determining by a base station whether a listen-before-talk process, performed in a current cycle, is successful for an unlicensed spectrum; and responsive to the determining, performing by the base station one of the following: in response to the listen-before-talk process being successful, transmitting one or more first reference signals over the unlicensed spectrum at a predetermined position in the current cycle; or in response to the listen-before-talk process not being successful, attempting to transmit one or more second reference signals over the unlicensed spectrum within a time window in the current cycle, based on at least one other listen-before-talk process run within the time window of the current cycle.
  • An exemplary computer program product includes a computer-readable storage medium bearing computer program code embodied therein for use with a computer.
  • the computer program code includes: code for determining by a base station whether a listen-before-talk process, performed in a current cycle, is successful for an unlicensed spectrum; and code, responsive to the determining, for performing by the base station one of the following: in response to the listen-before-talk process being successful, transmitting one or more first reference signals over the unlicensed spectrum at a predetermined position in the current cycle; or in response to the listen-before-talk process not being successful, attempting to transmit one or more second reference signals over the unlicensed spectrum within a time window in the current cycle, based on at least one other listen-before-talk process run within the time window of the current cycle.
  • an apparatus comprises: means for determining by a base station whether a listen-before-talk process, performed in a current cycle, is successful for an unlicensed spectrum; and means, responsive to the determining, for performing by the base station one of the following: in response to the listen-before-talk process being successful, transmitting one or more first reference signals over the unlicensed spectrum at a predetermined position in the current cycle; or in response to the listen-before-talk process not being successful, attempting to transmit one or more second reference signals over the unlicensed spectrum within a time window in the current cycle, based on at least one other listen-before-talk process run within the time window of the current cycle.
  • a method comprising: detecting by a user equipment one or more first reference signals in an unlicensed spectrum at a predetermined position in a current cycle; and responsive to the detecting, performing by the user equipment one of the following: in response to the detecting being successful, performing processing using the one or more first reference signals; or in response to the detecting not being successful, blind detecting one or more second reference signals over the unlicensed spectrum within a time window in the current cycle.
  • An additional exemplary embodiment includes a computer program, comprising code for performing the method of the previous paragraph, when the computer program is run on a processor.
  • An exemplary apparatus includes one or more processors and one or more memories including computer program code.
  • the one or more memories and the computer program code are configured to, with the one or more processors, cause the apparatus to perform at least the following: detecting by a user equipment one or more first reference signals in an unlicensed spectrum at a predetermined position in a current cycle; and responsive to the detecting, performing by the user equipment one of the following: in response to the detecting being successful, performing processing using the one or more first reference signals; or in response to the detecting not being successful, blind detecting one or more second reference signals over the unlicensed spectrum within a time window in the current cycle.
  • An exemplary computer program product includes a computer-readable storage medium bearing computer program code embodied therein for use with a computer.
  • the computer program code includes: code for detecting by a user equipment one or more first reference signals in an unlicensed spectrum at a predetermined position in a current cycle; and code, responsive to the detecting, for performing by the user equipment one of the following: in response to the detecting being successful, performing processing using the one or more first reference signals; or in response to the detecting not being successful, blind detecting one or more second reference signals over the unlicensed spectrum within a time window in the current cycle.
  • an apparatus comprises: means for detecting by a user equipment one or more first reference signals in an unlicensed spectrum at a predetermined position in a current cycle; and means, responsive to the detecting, for performing by the user equipment one of the following: in response to the detecting being successful, performing processing using the one or more first reference signals; or in response to the detecting not being successful, blind detecting one or more second reference signals over the unlicensed spectrum within a time window in the current cycle.
  • FIG. 1 is a block diagram of one possible and non-limiting exemplary system in which the exemplary embodiments may be practiced;
  • FIG. 2 illustrates one example for RLM-RS transmissions in NR-U
  • FIG. 3 illustrates one example for proposed RLM-RS transmission in NR-U, in an exemplary embodiment
  • FIG. 4 is a logic flow diagram performed by a gNB for enhanced RS transmission for RLM in NR unlicensed spectrum, in accordance with an exemplary embodiment
  • FIG. 4A is an illustration of sub-windows within a time window and possible parameters associated with these.
  • FIG. 5 is a logic flow diagram performed by a user equipment for enhanced RS transmission for RLM in NR unlicensed spectrum, in accordance with an exemplary embodiment.
  • eNB or eNodeB evolved Node B (e.g., an LTE base station)
  • gNB or gNodeB base station for 5G/NR
  • UE user equipment e.g., a wireless, typically mobile device
  • the exemplary embodiments herein describe techniques for enhanced RS transmission for RLM in the NR unlicensed spectrum. Additional description of these techniques is presented after a system into which the exemplary embodiments may be used is described.
  • FIG. 1 shows a block diagram of one possible and non-limiting exemplary system in which the exemplary embodiments may be practiced.
  • a user equipment (UE) 110 is in wireless communication with a wireless network 100.
  • a UE is a wireless, typically mobile device that can access a wireless network.
  • the UE 110 includes one or more processors 120, one or more memories 125, and one or more transceivers 130 interconnected through one or more buses 127.
  • Each of the one or more transceivers 130 includes a receiver, Rx, 132 and a transmitter, Tx, 133.
  • the one or more buses 127 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, and the like.
  • the one or more transceivers 130 are connected to one or more antennas 128.
  • the one or more memories 125 include computer program code 123.
  • the UE 110 includes a RLM module 140, comprising one of or both parts 140-1 and/or 140-2, which may be implemented in a number of ways.
  • the RLM module 140 may be implemented in hardware as RLM module 140-1, such as being implemented as part of the one or more processors 120.
  • the RLM module 140-1 maybe implemented also as an integrated circuit or through other hardware such as a programmable gate array.
  • the RLM module 140 may be implemented as RLM module 140-2, which is implemented as computer program code 123 and is executed by the one or more processors 120.
  • the one or more memories 125 and the computer program code 123 may be configured to, with the one or more processors 120, cause the user equipment 110 to perform one or more of the operations as described herein.
  • the UE 110 communicates with gNB 170 via a wireless link 111.
  • the gNB 170 is a base station that provides access by wireless devices such as the UE 110 to the wireless network 100.
  • the gNB 170 is a base station for 5G, also called New Radio (NR) .
  • the gNB 170 may also be an eNB (evolved NodeB) base station, for LTE (long term evolution) , or any other suitable base station.
  • the gNB 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N/W I/F (s) ) 161, and one or more transceivers 160 interconnected through one or more buses 157.
  • Each of the one or more transceivers 160 includes a receiver, Rx, 162 and a transmitter, Tx, 163.
  • the one or more transceivers 160 are connected to one or more antennas 158.
  • the one or more memories 155 include computer program code 153.
  • the gNB 170 includes a RLM module 150, comprising one of or both parts 150-1 and/or 150-2, which may be implemented in a number of ways.
  • the RLM module 150 maybe implemented in hardware as RLM module 150-1, such as being implemented as part of the one or more processors 152.
  • the RLM module 150-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array.
  • the RLM module 150 may be implemented as RLM module 150-2, which is implemented as computer program code 153 and is executed by the one or more processors 152.
  • the one or more memories 155 and the computer program code 153 are configured to, with the one or more processors 152, cause the gNB 170 to perform one or more of the operations as described herein.
  • the one or more network interfaces 161 communicate over a network such as via the links 176 and 131.
  • Two or more gNBs 170 communicate using, e.g., link 176.
  • the link 176 may be wired or wireless or both and may implement, e.g., an X2 interface.
  • the one or more buses 157 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like.
  • the one or more transceivers 160 may be implemented as a remote radio head (RRH) 195, with the other elements of the gNB 170 being physically in a different location from the RRH, and the one or more buses 157 could be implemented in part as fiber optic cable to connect the other elements of the gNB 170 to the RRH 195.
  • RRH remote radio head
  • the wireless network 100 may include a network control element (NCE) 190 that may include MME (Mobility Management Entity) /SGW (Serving Gateway) functionality, and which provides connectivity with a further network, such as a telephone network and/or a data communications network (e.g., the Internet) .
  • the gNB 170 is coupled via a link 131 to the NCE 190.
  • the link 131 may be implemented as, e.g., an S1 interface.
  • the NCE 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N/W I/F (s) ) 180, interconnected through one or more buses 185.
  • the one or more memories 171 include computer program code 173.
  • the one or more memories 171 and the computer program code 173 are configured to, with the one or more processors 175, cause the NCE 190 to perform one or more operations.
  • the wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software-based administrative entity, a virtual network.
  • Network virtualization involves platform virtualization, often combined with resource virtualization.
  • Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system. Note that the virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors 152 or 175 and memories 155 and 171, and also such virtualized entities create technical effects.
  • the computer readable memories 125, 155, and 171 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the computer readable memories 125, 155, and 171 may be means for performing storage functions.
  • the processors 120, 152, and 175 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • the processors 120, 152, and 175 may be means for performing functions, such as controlling the UE 110, gNB 170, and other functions as described herein.
  • the various embodiments of the user equipment 110 can include, but are not limited to, cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • the exemplary embodiments concern a NR-U system.
  • NR-U systems and what frequency bands might be involved see, e.g., Qualcomm Incorporated, “Revised SID on NR-based Access to Unlicensed Spectrum” , RP-172021, 3 GPP TSG RAN Meeting #77, Sapporo, Japan, September 11 -14, 2017. This is a 3GPP work item description also entitled “Study on NR-based Access to Unlicensed Spectrum” .
  • the CRS is cell-specific and transmitted at each DL sub-frame. It can help to ensure the UE has access to the radio link quality at least once per radio frame, since multiple transmission samples exist in one radio frame. Therefore, the RLM measurement in MF, which relies on the DRS and CRS, is feasible.
  • the RLM-RS (SSB and CSI-RS) can be transmitted once per cycle at a fixed location. Therefore, the potential measurement samples may be much fewer than in an MF system, especially for long-period RS (e.g., where a relatively long time period passes between RSs) .
  • FIG. 2 illustrates attempted transmission of the RLM-RS over time with a periodicity 240 and each cycle 210-1 through 210-5 has a period corresponding to the periodicity 240. As can be seen in FIG.
  • the gNB 170 sends an RLM-RS transmission 220 in cycle 210-1 (and cycles 210-4 and 210-5) , but once the gNB 170 missed the RS transmission points due to the dropped RLM-RS transmissions 230 (e.g., due to corresponding LBT failures) in cycles 210-2 and 210-3, the gNB 170 must wait until the next cycle (cycle 210-4 in this example) to have the opportunity to transmit.
  • the UE 110 would not know the radio link status for one or several cycles (several cycles 210-2 and 210-3 in this example) in case of a high LBT blocking rate. Of course, the UE also cannot report the indication to higher layers, which could lead to a radio link failure (RLF) declaration in this case.
  • RLF radio link failure
  • the exemplary embodiments herein aim to provide options to provide multiple potential RS transmission opportunities for RLM measurement in NR unlicensed spectrum.
  • An exemplary embodiment proposes one robust RLM-RS transmission scheme based on LBT results to facilitate RLM measurement for reliably monitoring the radio link quality.
  • an exemplary RS expansion transmission scheme may be triggered to send opportunistic RLM-RS in one flexible time window.
  • the detailed design for the proposed RS transmission mainly includes two aspects: (1) an RS expansion scheme and (2) a flexible time window. These are briefly explained below.
  • the RSs not only include the legacy RLM-RS and but may also include temporary RLM-RS (or vice versa) .
  • the legacy RLM-RS can be different from the original blocked periodic RS. For example, it may not involve the retransmission of the original blocked RS. That is, it can be the retransmission of the original blocked RS or other periodic RS. Put differently, it is not limited to the original blocked RS. It can cover more RS instead. For example, if the original blocked RLM-RS is SSB1, the legacy RLM-RS can be SSB1 or SSB2.
  • the temporary RLM-RS may be, e.g., the group common DMRS in PDCCH or UE-specific DMRS in PDCCH or DMRS in PDSCH.
  • the time window may be dynamically triggered when certain conditions are met.
  • the time window allows the gNB 170 (e.g., or eNB) to transmit the opportunistic RS in the time window after one or several consecutive periods of legacy RS transmission have been blocked by LBT.
  • the time window can be flexible and configured as follows:
  • the time window can be multiple continuous slots or multiple non-continuous sub-windows. Each sub-window may include several continuous slots.
  • the position of the time window can be configured by RRC signaling.
  • the starting position may be indicated by one relative offset within the sub-frame location of legacy periodic RLM-RS.
  • the offset is relative a time location of a periodic RLM-RS.
  • the RLM-RS transmission would be blocked by an LBT failure and a corresponding dropped RLM-RS transmission 230, which would impact the performance of RLM measurement.
  • NR-U NR unlicensed spectrum
  • FIG. 3 shows an example for a proposed RLM-RS transmission in NR-U.
  • FIG. 3 shows five cycles 210-n, 210-n+1, 210-n+2, 210-n+3, and 210-n+4, each with a same periodicity 240.
  • the first cycle 210-n has a normal RLM-RS transmission 220.
  • the second cycle 210-n+1 and the third cycle 210-n+2 have LBT failures and corresponding dropped RLM-RS transmissions 230.
  • the fourth cycles 210-n+3 and 210-n+4 have normal RLM-RS transmissions 220.
  • an offset 310 is used between a time location of the dropped RLM-RS transmission 230 and the time location of the (e.g., start of the) activated time window 330, and there is an opportunistic RLM-RS transmission 320-1, 320-2 in each of the time windows 330-1, 330-2, respectively.
  • the position of time windows 330 can be indicated by relative frame number, which has a relationship to a position of a normal periodic RLM-RS signal.
  • the relative frame number can be indicated by one offset 310 from a position of periodic RLM-RS signal (e.g., a dropped RLM-RS transmission 230) .
  • the time window 330 can be expressed in some embodiments by offset 310 and the length of time 380 (also referred to as length 380) by RRC signaling.
  • the starting point of the time window 330-1 between cycle #n+1 (210-n+1) and cycle #n+2 (210-n+2) can be indicated by the offset 310 relative to the position of the periodic RLM-RS signal, that is the dropped RLM-RS transmission 230, at cycle #n+1 (210-n+1) .
  • the activated time window 330 is implicitly and dynamically triggered.
  • the time window 330 is triggered after one periodic RLM-RS was lost in the transmission opportunities, as shown in FIG. 3.
  • the time window 330-1 between cycle #n+1 (210-n+1) and cycle #n+2 (210-n+2) has been activated.
  • the gNB 170 would attempt to transmit the opportunistic RLM-RS transmission 320-1 (and corresponding signal) within the activated time window 330-1.
  • the time window 330-2 between cycle #n+2 (210-n+2) and cycle #n+3 (210-n+3) has been activated.
  • the gNB 170 would attempt to transmit the opportunistic RLM-RS transmission 320-2 (and corresponding signal) within the activated time window 330-2.
  • the opportunistic RLM-RS transmissions 320-1, 320-2 are at different (time) positions within their respective time windows 330-1, 330-2.
  • the opportunistic RLM-RS signal may include two parts: a configured RLM-RS signal 350 and a DMRS signal 360.
  • the configured signal 350 can be the SSB 350-1 or CSI-RS 350-2 in the NR system.
  • the DMRS signal 360 can be the common-group DMRS in the PDCCH 360-1, or the UE-Specific DMRS in PDCCH 360-2, or DMRS in PDSCH 360-3.
  • the gNB 170 In the activated time window 330, if the DMRS signal 360 is transmitted at PDCCH or PDSCH, there is no need to transmit the configured RLM-RS signal 350. Only transmitting the DMRS signal 360 reduces the resource overhead to avoid the additional configured RLM-RS signal 350 transmission, because the gNB 170 just needs to transmit DMRS signals 360. Of course, if no DMRS signal 360 is transmitted within the activated time window 330, the gNB 170 needs to transmit the configured RLM-RS signal 350.
  • the normal RLM-RS transmission 220 will also be referred to as the normal RLM-RS signal 220.
  • the opportunistic RLM-RS transmission 320 will be referred to as the opportunistic RLM-RS signal 320.
  • either normal RLM-RS or opportunistic RLM-RS transmissions would be performed based on LBT results.
  • the gNB 170 would transmit the normal RLM-RS periodically at the predefined position.
  • the time window 330 would be (e.g., instantaneously) triggered and the gNB 170 would send the opportunistic RLM-RS when the gNB 170 grabs the channel in the time window 330.
  • a two-layer detection is used. First, the UE 110 would first detect whether the normal periodic RLM-RS 220 is at the predefined position. Then, if no normal RLM-RS 22 has been detected, the UE 110 starts to blind detect the opportunistic RLM-RS within the time window.
  • FIG. 3 The normal periodic RLM-RS signal at cycle #n (210-n) has been transmitted successfully, and the time window 330 is not triggered. However, the normal periodic RLM-RS signal transmission at cycle #n+1 (210-n+1) has been blocked by LBT.
  • the time window 330-1 between cycle #n+1 (210-n+1) and cycle #n+2 (210-n+2) is triggered to start after one offset 310 from the position of the dropped RLM-RS transmission 230 at cycle #n+1 (210-n+1) .
  • the gNB 170 would attempt to transmit the opportunistic RLM-RS signal 320-1 within the time window 330-1. If the LBT is successful in one of the transmission slots within the window 330-1, the gNB 170 transmits the opportunistic RS signal 320.
  • the time window 330-2 between cycle #n+2 (210-n+2) and cycle #n+3 (210-n+3) is triggered to start after one offset 310 with the position of the dropped RLM-RS transmission 230 at cycle #n+2 (210-n+2) .
  • the gNB 170 would attempt to transmit the opportunistic RLM-RS signal 320-2 within the time window 330-2. If the LBT is successful in one of the transmission slots within the window 330-2, the gNB 170 transmits the opportunistic RS signal 320.
  • the UE 110 first detects the normal periodic RLM-RS at cycle #n (210-n) , cycle #n+1 (210-n+1) , and the like.
  • the UE 110 has not detected the normal periodic RLM-RS 220 at cycle #n+1 (210-n+1) (e.g., the detection fails)
  • the UE 110 would attempt to blind detect the opportunistic RLM-RS 320 within the time window 330-1 between cycle #n+1 and cycle #n+2.
  • the UE 110 when the UE 110 has not detected the normal periodic RLM-RS 220 at cycle #n+2 (210-n+2) (e.g., the detection fails) , the UE 110 would attempt to blind detect the opportunistic RLM-RS 320 within the time window 330-2 between cycle #n+2 and cycle #n+3.
  • FIGS. 4 and 5 described these exemplary operations in additional detail.
  • FIG. 4 is a logic flow diagram performed by a gNB for enhanced RS transmission for RLM in NR unlicensed spectrum, in accordance with an exemplary embodiment.
  • This figure illustrates the operation of an exemplary method or methods, a result of execution of computer program instructions embodied on a computer readable memory, functions performed by logic implemented in hardware, and/or interconnected means for performing functions in accordance with exemplary embodiments.
  • the blocks in FIG. 4 are assumed to be performed by a gNB (or eNB or other network node) , e.g., under control of the RLM module 150 at least in part.
  • the gNB 170 determines one or more of the following: the offset 310, the length of time 380 for time window 330, N, and window parameter (s) .
  • the parameter N is described below, and the window parameter (s) are described in reference to FIG. 4A.
  • the gNB 170 in block 420 sends indications of these determined parameters, meaning one or more the offset 310, the length of time 380, N, and the window parameter (s) to the UE 110. This sending may be performed, e.g., via RRC signaling, although other signaling is possible.
  • the offset 310 and the length of time 380 might be configured via other means, such as being described in a technical specification.
  • the parameters N and the window parameter (s) could also be communicated or defined through other techniques, such as via a technical specification.
  • N While the example of FIG. 3 shows that a time window 330 is triggered after a single LBT failure and corresponding dropped RLM-RS transmission 230, the time window 330 could be triggered after one or several LBT failures and corresponding dropped RLM-RS transmissions 230.
  • the detailed number, N, of failed LBT and corresponding dropped RLM-RS transmissions 230 can be configured by the network in some embodiments. So the parameter N is used in these embodiments to judge whether transmission (FIG. 4) or detection (FIG. 5) of the opportunistic RLM-RS should be performed. That is to say, if the number of dropped RLM-RS transmissions 230 is smaller than N, the time window would not be triggered.
  • the number of dropped RLM-RS transmission 230 is compared with N and the time window would be triggered in response to the number of dropped RLM-RS transmissions 230 being equal to or greater than N.
  • the time window could alternatively be triggered in response to the number of dropped RLM-RS transmission 230 being greater than (but not equal to) N.
  • the number of dropped RLM-RS transmissions 230 is, in the examples of FIGS. 4 and 5, indicated by a counter shown as “n” . In FIG. 4, this counter, n, is set to 0 (zero) in block 423.
  • the RLM-RS may be one or both of Synchronization Signal Blocks (SSBs) and Channel Status Information Reference Signals (CSI-RSs) . Note that the predefined position is illustrated in FIG.
  • the counter n is (re) set to zero in block 452. As long as the LBT process is successful for continuous cycles 210 (that is, cycles 210 that are next to and contiguous with each other in time) , the normal RLM-RS transmissions 220 may be continued for multiple cycles 210.
  • the flow proceeds to blocks 445 and 455, if the parameter N is used such as being received (or configured in some other way, such as via a technical specification) . Note that if the parameter N is not used, the flow could proceed from block 440 to block 460 (and also tracking of the counter n would not be performed in blocks 423, 445, 452, and 485) .
  • the term continuous means “in a row” , such that multiple dropped RLM-RS transmissions 230 would be dropped in multiple continuous cycles 210 (that is, multiple cycles 210 in a row in time) .
  • the flow proceeds to block 460.
  • the gNB 170 in block 460 triggers (e.g., activates) , after the offset 310, the time window 330 for the length of time 380.
  • the gNB 170 attempts to transmit (block 470) opportunistic RLM-RS 320 in the time window 330, and will transmit the opportunistic RLM-RS 320 over the unlicensed spectrum if an LBT process is successful.
  • the flow proceeds to block 495, where no transmission of opportunistic RLM-RS is performed in the time window, because all LBT were not successful (that is, none of the LBT were successful) .
  • the flow then proceeds to block 425, where another LBT process is performed for a new, subsequent cycle 210.
  • the flow proceeds back to block 470, where the gNB 170 attempts to transmit the opportunistic RLM-RS 320 in the time window 330.
  • FIG. 4A is an illustration of sub-windows 415 within a time window 330 and also illustrates possible parameters associated with these.
  • the larger time window 330 may include some non-continuous sub-windows 415 (where non-continuous means there is a gap in time between sub-windows) .
  • the number of sub-windows 415 is illustrated by the number 417 of sub-windows 417. It should be noted the three is merely an illustration, and more or fewer sub-windows may be used.
  • the distance (shown as spaces, SP) between the sub-windows 415 can be equally spaced, and the same length (shown as length of a sub-window, L SW ) of sub-windows can be designed.
  • L SW length of a sub-window
  • window parameters could include the length 380 of the large time window 330, the number 417 of sub-windows 415, and the length Lsw of a sub-window.
  • window parameters could include the length 380 of the large time window 330, the length Lsw of each sub-window, and the length (e.g., SP) of a space 418.
  • the number of sub-windows could be calculated based on this information. Other examples are possible.
  • the gNB 170 would perform LBT in the sub-windows 415 sequentially in time, and if an LBT is successful, the gNB 170 would transmit the opportunistic RLM-RS 320 in the sub-window 415. For instance, for each iteration through block 470, the gNB 170 attempts to transmit the opportunistic RLM-RS 320 in one of the sub-windows 415 and sequentially in time. For the UE 110, the UE 110 would detect the opportunistic RLM-RS 320 in the sub-windows 415 sequentially in time.
  • FIG. 5 this figure illustrates the operation of an exemplary method or methods, a result of execution of computer program instructions embodied on a computer readable memory, functions performed by logic implemented in hardware, and/or interconnected means for performing functions in accordance with exemplary embodiments.
  • the blocks in FIG. 5 are assumed to be performed by a user equipment 110, e.g., under control of the RLM module 140 at least in part.
  • the UE 110 receives indications of parameters that are set by the network.
  • the parameters may include one or more of the following: offset 310, length of time 380, N, and window parameter (s) . As also previously described, some or all of these might not be used or might be defined some other way, such as via a technical specification.
  • the number e.g., n
  • the flow proceeds to block 530, where another detection of the normal periodic RLM-RS is performed in a new, subsequent cycle 210. Note that if N is not used, the flow could proceed from block 540 to block 560 and also the blocks 522, 542, 555, and 592 that manipulate the counter would not be used.
  • the blind detection of the opportunistic RLM-RS within the time window fails in block 595.
  • the UE 110 returns to block 530 and detects the normal periodic RLM-RS 220, e.g., in the next cycle 210.
  • the UE 110 performs processing on the reference signals. This processing may be described as follows.
  • RLM after the UE has measured the RSs, the UE 110 will compare the measured value to the thresholds Qout and Qin.
  • OOS out-of-sync
  • IS in-sync
  • the physical layer in the UE shall send an in-sync (IS) indication to higher layers.
  • a timer is started. If not enough consecutive IS indications are received before the timer expiry, a radio link failure (RLF) is declared. The declaration of the RLF causes additional actions to be considered or taken, such as a handover or other actions.
  • a technical effect and advantage of one or more of the example embodiments disclosed herein is the proposed mechanism increases RS measurement samples by transmitting the opportunistic RLM-RS in the configured time window when the normal RLM-RS has been blocked by failed LBT.
  • Another technical effect and advantage of one or more of the example embodiments disclosed herein is one time window for opportunistic RLM-RS transmission is introduced to reduce the UE detection complexity by avoiding blind detection in all the sub-frames between two normal RLM-RS transmission locations.
  • Another technical effect and advantage of one or more of the example embodiments disclosed herein is a proposed RS transmission scheme reuses the existing DMRS within the time window where there is DMRS in PDCCH or PDSCH. It therefore reduces the resource overhead by avoiding the additional RLM-RS transmission in the time window.
  • Example 1 A method, comprising:
  • Example 2 The method of example 1, further comprising:
  • Example 3 The method of example 1, further comprising
  • Example 4 The method of any of examples 1 to 3, wherein the attempting to transmit the one or more second reference signals over the unlicensed spectrum within the time window in the current cycle is performed only in response to a number of dropped first reference signals in multiple (e.g., previous) cycles meeting a threshold, the dropped first reference signals caused by the listen-before-talk process not being successful for the multiple (e.g., previous) cycles.
  • the previous cycles are the (e.g., continuous) cycles previous to the current cycle.
  • Example 5 A method, comprising:
  • Example 6 The method of example 5, further comprising:
  • Example 7 The method of example 5, further comprising
  • Example 8 The method of any of examples 5 to 7, wherein the blind detecting the one or more second reference signals over the unlicensed spectrum within the time window in the current cycle is performed only in response to a number of dropped first reference signals in multiple cycles meeting a threshold, the dropped first reference signals determined by the first reference signals not being detected for the multiple cycles.
  • Example 9 The method of any of examples 1 to 8, wherein the time window is offset from a time location where a first reference signal in the current cycle would have been transmitted if the listen-before-talk process was successful but was dropped due to the listen-before-talk process failing.
  • Example 10 The method of example 9, wherein the time window has a length of time, and wherein the method further comprises communicating indications of the length of time and the offset between the base station and the user equipment.
  • Example 11 The method of example 10, wherein the communicating is performed using radio resource control signaling.
  • Example 12 The method of any of examples 1 to 11, wherein the one or more first reference signals comprise one or both of at least one synchronization signal block and at least one channel status information reference signal.
  • Example 13 The method of any of examples 1 to 12, wherein the one or more second reference signals comprise one or both of a configured radio link monitoring reference signal and a demodulation reference signal.
  • Example 14 The method of example 13, wherein a demodulation reference signal comprises one or more of the following: a common-group demodulation reference signal in a physical downlink control channel; a user equipment-specific demodulation reference signal in the physical downlink control channel; and demodulation reference signal in a physical downlink shared channel.
  • Example 15 The method of example 14, wherein the one or more first reference signals are only the demodulation reference signals and not the configured radio link monitoring reference signals.
  • Example 16 The method of any of examples 13 or 14, wherein a configured radio link monitoring reference signal comprises one or both of at least one synchronization signal block and at least one channel status information reference signal.
  • Example 17 The method of any of examples 1 to 16, wherein the time window comprises multiple non-continuous sub-windows.
  • Example 18 A computer program comprising program code for executing the method according to any of examples 1 to 17.
  • Example 19 The computer program according to example 18, wherein the computer program is a computer program product comprising a computer-readable medium bearing computer program code embodied therein for use with a computer.
  • Example 20 An apparatus, comprising:
  • Example 21 The apparatus of example 20, further comprising:
  • Example 22 The apparatus of example 20, further comprising
  • Example 23 The apparatus of any of examples 20 to 22, wherein the attempting to transmit the one or more second reference signals over the unlicensed spectrum within the time window in the current cycle is performed only in response to a number of dropped first reference signals in multiple cycles meeting a threshold, the dropped first reference signals caused by the listen-before-talk process not being successful for the multiple cycles.
  • Example 24 An apparatus, comprising:
  • Example 25 The apparatus of example 24, further comprising:
  • Example 26 The apparatus of example 24, further comprising
  • Example 27 The apparatus of any of examples 24 to 25, wherein the blind detecting the one or more second reference signals over the unlicensed spectrum within the time window in the current cycle is performed only in response to a number of dropped first reference signals in multiple cycles meeting a threshold, the dropped first reference signals determined by the first reference signals not being detected for the multiple cycles.
  • Example 28 The apparatus of any of examples 20 to 27, wherein the time window is offset from a time location where a first reference signal in the current cycle would have been transmitted if the listen-before-talk process was successful but was dropped due to the listen-before-talk process failing.
  • Example 29 The apparatus of example 28, wherein the time window has a length of time, and wherein the apparatus further comprises means for communicating indications of the length of time and the offset between the base station and the user equipment.
  • Example 30 The apparatus of example 29, wherein the communicating is performed using radio resource control signaling.
  • Example 31 The apparatus of any of examples 20 to 30, wherein the one or more first reference signals comprise one or both of at least one synchronization signal block and at least one channel status information reference signal.
  • Example 32 The apparatus of any of examples 20 to 31, wherein the one or more second reference signals comprise one or both of a configured radio link monitoring reference signal and a demodulation reference signal.
  • Example 33 The apparatus of example 32, wherein a demodulation reference signal comprises one or more of the following: a common-group demodulation reference signal in a physical downlink control channel; a user equipment-specific demodulation reference signal in the physical downlink control channel; and demodulation reference signal in a physical downlink shared channel.
  • Example 34 The apparatus of example 33, wherein the one or more first reference signals are only the demodulation reference signals and not the configured radio link monitoring reference signals.
  • Example 35 The apparatus of any of examples 32 or 34, wherein a configured radio link monitoring reference signal comprises one or both of at least one synchronization signal block and at least one channel status information reference signal.
  • Example 36 The apparatus of any of examples 20 to 35, wherein the time window comprises multiple non-continuous sub-windows.
  • Example 37 A base station comprising any of examples 20 to 23 and examples that depend from these examples.
  • Example 38 A user equipment comprising any of examples 24 to 27 and examples that depend from these examples.
  • Example 39 An apparatus, comprising:
  • the one or more memories and the computer program code configured, with the one or more processors, to cause the apparatus to perform any of the methods of examples 21 to 17.
  • Example 40 An apparatus, comprising:
  • the one or more memories and the computer program code configured, with the one or more processors, to cause the apparatus to implement the apparatus of any of examples 20 to 36.
  • Embodiments herein may be implemented in software (executed by one or more processors) , hardware (e.g., an application specific integrated circuit) , or a combination of software and hardware.
  • the software e.g., application logic, an instruction set
  • a “computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer, with one example of a computer described and depicted, e.g., in FIG. 1.
  • a computer-readable medium may comprise a computer-readable storage medium (e.g., memories 125, 155, 171 or other device) that may be any media or means that can contain, store, and/or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
  • a computer-readable storage medium does not comprise propagating signals.
  • the different functions discussed herein may be performed in a different order and/or concurrently with each other. Furthermore, if desired, one or more of the above-described functions may be optional or may be combined.

Landscapes

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

Abstract

Selon la présente invention, un émetteur détermine la réussite ou l'échec d'une procédure LBT exécutée dans un cycle actuel pour un spectre sans licence, et : en cas de réussite de la procédure LBT, transmet un ou plusieurs premiers signaux de référence sur le spectre sans licence à une position prédéterminée dans le cycle actuel; ou bien, en cas d'échec de la procédure LBT, tente de transmettre un ou plusieurs seconds signaux de référence sur le spectre sans licence dans une fenêtre temporelle du cycle actuel, sur la base d'un ou plusieurs autres procédures LBT exécutées dans la fenêtre temporelle du cycle actuel. Un récepteur détecte le ou les premiers signaux de référence, et : en réponse à la réussite de la procédure LBT, exécute un traitement au moyen du ou des premiers signaux de référence; ou bien, en réponse à l'échec de la procédure LBT, exécute une détection aveugle du ou des seconds signaux de référence sur le spectre sans licence dans une fenêtre temporelle du cycle actuel.
PCT/CN2018/086847 2018-05-15 2018-05-15 Transmission de rs améliorée pour une rlm dans un spectre sans licence nr WO2019218142A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201880095664.7A CN112425248B (zh) 2018-05-15 2018-05-15 Nr未许可频谱中的rlm的增强型rs传输
PCT/CN2018/086847 WO2019218142A1 (fr) 2018-05-15 2018-05-15 Transmission de rs améliorée pour une rlm dans un spectre sans licence nr

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/086847 WO2019218142A1 (fr) 2018-05-15 2018-05-15 Transmission de rs améliorée pour une rlm dans un spectre sans licence nr

Publications (1)

Publication Number Publication Date
WO2019218142A1 true WO2019218142A1 (fr) 2019-11-21

Family

ID=68539231

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/086847 WO2019218142A1 (fr) 2018-05-15 2018-05-15 Transmission de rs améliorée pour une rlm dans un spectre sans licence nr

Country Status (2)

Country Link
CN (1) CN112425248B (fr)
WO (1) WO2019218142A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111404785A (zh) * 2020-05-13 2020-07-10 袁野 基于云计算的5g移动网络检测系统
CN114258130A (zh) * 2020-09-23 2022-03-29 上海诺基亚贝尔股份有限公司 由探测参考信号触发的定位参考信号传输
WO2022207966A1 (fr) * 2021-04-01 2022-10-06 Nokia Solutions And Networks Oy Test de dispositif

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024031408A1 (fr) * 2022-08-10 2024-02-15 Nokia Shanghai Bell Co., Ltd. Détection efficace de signal de référence de positionnement pour positionnement de liaison latérale dans un spectre sans licence

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105992226A (zh) * 2015-03-20 2016-10-05 宏碁股份有限公司 在未授权频谱中发送参考信号的方法和无线装置
US20160330678A1 (en) * 2015-05-07 2016-11-10 Electronics And Telecommunications Research Institute Method and device for transmitting and receiving discovery reference signal through channel of unlicensed frequency band
WO2017069571A1 (fr) * 2015-10-21 2017-04-27 엘지전자 주식회사 Procédés et dispositifs pour émettre/recevoir un signal de découverte dans un système d'accès sans fil prenant en charge une bande non autorisée
CN106664587A (zh) * 2014-07-31 2017-05-10 株式会社Ntt都科摩 用户终端、无线通信系统以及无线通信方法
CN107113880A (zh) * 2014-11-18 2017-08-29 高通股份有限公司 用于在未授权无线电频谱频带上发送前导的技术

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10034283B2 (en) * 2013-08-23 2018-07-24 Qualcomm Incorporated CSI and ACK reporting enhancements in LTE/LTE-A with unlicensed spectrum
US9949275B2 (en) * 2013-10-01 2018-04-17 Qualcomm Incorporated Physical uplink control management in LTE/LTE-A systems with unlicensed spectrum
US9681325B2 (en) * 2013-12-19 2017-06-13 Qualcomm Incorporated Channel and interference measurement in LTE/LTE-A networks including unlicensed spectrum
US9967802B2 (en) * 2014-06-13 2018-05-08 Qualcomm Incorporated Wireless communications over unlicensed radio frequency spectrum
US10959197B2 (en) * 2014-09-08 2021-03-23 Samsung Electronics Co., Ltd. Cell detection, synchronization and measurement on unlicensed spectrum
US20170238311A1 (en) * 2014-09-26 2017-08-17 Nokia Technologies Oy Synchronous Licensed Assisted Access
US9693323B2 (en) * 2014-10-27 2017-06-27 Qualcomm Incorporated Multi-channel CSI feedback for LTE/LTE-A with unlicensed spectrum
CN105991210B (zh) * 2015-01-28 2019-03-26 中国移动通信集团公司 一种非授权频段上的参考信号发送方法、接收方法及装置
CN107211281A (zh) * 2015-01-29 2017-09-26 株式会社Ntt都科摩 无线基站、用户终端以及无线通信方法
US10129782B2 (en) * 2015-01-30 2018-11-13 Samsung Electronics Co., Ltd. Methods and apparatus for CSI measurement configuration and reporting on unlicensed spectrum
CN106470432A (zh) * 2015-08-14 2017-03-01 中国移动通信集团公司 一种终端在非授权频段上的测量方法、装置、终端及基站
CN108352909B (zh) * 2015-09-25 2023-02-21 瑞典爱立信有限公司 用于执行信道状态测量的方法、用户设备和网络节点
CN107734682B (zh) * 2016-08-12 2023-09-29 中兴通讯股份有限公司 信息传输方法、传输节点及传输系统

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106664587A (zh) * 2014-07-31 2017-05-10 株式会社Ntt都科摩 用户终端、无线通信系统以及无线通信方法
CN107113880A (zh) * 2014-11-18 2017-08-29 高通股份有限公司 用于在未授权无线电频谱频带上发送前导的技术
CN105992226A (zh) * 2015-03-20 2016-10-05 宏碁股份有限公司 在未授权频谱中发送参考信号的方法和无线装置
US20160330678A1 (en) * 2015-05-07 2016-11-10 Electronics And Telecommunications Research Institute Method and device for transmitting and receiving discovery reference signal through channel of unlicensed frequency band
WO2017069571A1 (fr) * 2015-10-21 2017-04-27 엘지전자 주식회사 Procédés et dispositifs pour émettre/recevoir un signal de découverte dans un système d'accès sans fil prenant en charge une bande non autorisée

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111404785A (zh) * 2020-05-13 2020-07-10 袁野 基于云计算的5g移动网络检测系统
CN114258130A (zh) * 2020-09-23 2022-03-29 上海诺基亚贝尔股份有限公司 由探测参考信号触发的定位参考信号传输
WO2022207966A1 (fr) * 2021-04-01 2022-10-06 Nokia Solutions And Networks Oy Test de dispositif

Also Published As

Publication number Publication date
CN112425248B (zh) 2024-05-07
CN112425248A (zh) 2021-02-26

Similar Documents

Publication Publication Date Title
US11962524B2 (en) Beam failure recovery
TWI687061B (zh) 行動通訊中跨鏈路干擾測量方法及設備
WO2019218142A1 (fr) Transmission de rs améliorée pour une rlm dans un spectre sans licence nr
US11457496B2 (en) Beam failure recovery and related timing determination techniques
US11463943B2 (en) Transmission of discovery reference signals on unlicensed carrier in a wireless network
US20200028545A1 (en) Beam-based radio link monitoring
EP3738221A1 (fr) Coreset et association de qcl dans une procédure de récupération de faisceau
CN112119672A (zh) 辅小区波束恢复
WO2019215389A2 (fr) Sélection et utilisation d'un sous-ensemble de ressources de détection de défaillance de faisceau
US10784996B2 (en) HARQ feedback on grant-less UL
US10763985B2 (en) Control channel design and use for narrow band communication
US20180324721A1 (en) Signaling procedure for new radio initial access
WO2019028728A1 (fr) Surveillance de liaison radio améliorée dans un système new radio
CN104904293A (zh) 用于无线电链路监视的方法和装置
WO2022003520A1 (fr) Détermination de la présence d'équipements d'utilisateur ayant une qualité radio faible et ajustement de signaux de référence à utiliser avec ces équipements d'utilisateur
US20220104302A1 (en) Response for trp specific bfrq and beam reset
EP3198944B1 (fr) Écoute avant de parler pour un signal de découverte dans un système d'évolution à long terme (lte) à accès assisté par licence
WO2021028894A1 (fr) Procédé et appareil pour des signaux de référence dans une fenêtre de mesure
WO2020029772A1 (fr) Procédé d'indication et d'acquisition de la position d'un bloc de signaux de synchronisation, station de base, terminal et support
WO2020042034A1 (fr) Schéma de rétroaction d'harq hybride pour une salve autonome sur une nr-u
WO2019229292A1 (fr) Évaluation de liaison radioélectrique de parties de bande passante
US11863325B2 (en) Finite field parity for feedback codebook
US20160316352A1 (en) D2d signal detecting method and device
EP4233338A1 (fr) Correction dynamique de niveau de signal d'ue pour une modification de mesure et/ou une détection de stationnarité

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18919016

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18919016

Country of ref document: EP

Kind code of ref document: A1