WO2020193317A1 - Mécanisme amélioré d'écoute avant transmission pour des signaux de référence de découverte sans licence de nouvelle radio - Google Patents

Mécanisme amélioré d'écoute avant transmission pour des signaux de référence de découverte sans licence de nouvelle radio Download PDF

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Publication number
WO2020193317A1
WO2020193317A1 PCT/EP2020/057476 EP2020057476W WO2020193317A1 WO 2020193317 A1 WO2020193317 A1 WO 2020193317A1 EP 2020057476 W EP2020057476 W EP 2020057476W WO 2020193317 A1 WO2020193317 A1 WO 2020193317A1
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WIPO (PCT)
Prior art keywords
reference signal
discovery reference
configuration
drs
channel access
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PCT/EP2020/057476
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English (en)
Inventor
Timo Erkki Lunttila
Kari Juhani Hooli
Esa Tapani Tiirola
Karol Schober
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Nokia Technologies Oy
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Publication of WO2020193317A1 publication Critical patent/WO2020193317A1/fr

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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
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA

Definitions

  • Some example embodiments may generally relate to mobile or wireless telecommunication systems, such as Long Term Evolution (LTE) or fifth generation (5G) radio access technology or new radio (NR) access technology, or other communications systems.
  • LTE Long Term Evolution
  • 5G fifth generation
  • NR new radio
  • certain embodiments may relate to systems and/or methods for configuration and/or transmission of discovery reference signals (DRS).
  • DRS discovery reference signals
  • Examples of mobile or wireless telecommunication systems may include the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN), Long Term Evolution (LTE) Evolved UTRAN (E-UTRAN), LTE-Advanced (LTE-A), MulteFire, LTE-A Pro, and/or fifth generation (5G) radio access technology or new radio (NR) access technology.
  • UMTS Universal Mobile Telecommunications System
  • UTRAN Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • E-UTRAN Evolved UTRAN
  • LTE-A LTE-Advanced
  • MulteFire LTE-A Pro
  • 5G wireless systems refer to the next generation (NG) of radio systems and network architecture.
  • 5G is mostly built on a new radio (NR), but a 5G (or NG) network can also be built on E-UTRA radio.
  • NR provides bitrates on the order of 10-20 Gbit/s or higher, and can support at least enhanced mobile broadband (eMBB) and ultra-reliable low-latency- communication (URLLC) as well as massive machine type communication (mMTC).
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low-latency- communication
  • mMTC massive machine type communication
  • NR is expected to deliver extreme broadband and ultra-robust, low latency connectivity and massive networking to support the Internet of Things (IoT).
  • IoT Internet of Things
  • M2M machine-to-machine
  • the nodes that can provide radio access functionality to a user equipment may be named gNB when built on NR radio and may be named NG-eNB when built on E-UTRA radio.
  • Fig. 1 illustrates an example depicting SSB bursts in DRS transmission windows, according to one example
  • Fig. 2 illustrates an example of the interaction between first and second DRS configurations, according to an embodiment
  • Fig. 3 illustrates an example depicting operation with multiple transmitted beams in SSB burst, according to an embodiment
  • Fig. 4a illustrates an example flow diagram of a method, according to an embodiment
  • Fig. 4b illustrates an example flow diagram of a method, according to an embodiment
  • Fig. 5a illustrates an example block diagram of an apparatus, according to an embodiment
  • Fig. 5b illustrates an example block diagram of an apparatus, according to another embodiment.
  • Certain embodiments may generally relate to NR unlicensed (NR-U) including, for example, a physical layer design of NR-U.
  • Some embodiments may provide improved (gNB) channel access for transmission of Discovery Reference Signals (DRS) in conditions where listen before talk (LBT) may prevent the DRS transmission from happening on certain occasions.
  • DRS Discovery Reference Signals
  • DRS transmission may be inhibited.
  • certain embodiments are configured to define two types of DRS transmission configurations. As used herein, a first of the two types of DRS transmission configuration may be referred to as a first DRS, and a second of the two types of DRS transmission configuration may be referred to as a second DRS.
  • An embodiment may also define rules or logic for the interaction between the two types of DRS transmission configurations (i.e., between the first DRS and second DRS) such that an optimal DRS density can be obtained, while taking into account gNB’s uncertainty in channel access due to LBT as well as regulatory rules governing the channel access.
  • LTE Licensed Assisted Access DRS make use of the European T elecommunications Standards Institute (ETSI) Broadband Radio Access Networks’ (BRAN) clause for short control signaling, where LBT is not required for signals with a duty cycle less than 5%.
  • ETSI European T elecommunications Standards Institute
  • BRAN Broadband Radio Access Networks
  • DRS are transmitted with Cat 2 LBT with a periodicity of 40 ms or longer.
  • Within each 40 ms DRS cycle there are up to five possible starting locations in consecutive subframes where DRS transmission may be attempted.
  • 3GPP technical report (TR) 38.889 ⁇ 8.2 defines NR channel access (LBT) options, and the contents of 3GPP TR 38.889 ⁇ 8.2 are incorporated herein by reference in its entirety.
  • 3GPP TR 38.889 ⁇ 8.2 provides that the channel access schemes for NR-based access for unlicensed spectrum is classified into four categories.
  • Category 1 refers to the immediate transmission after a short switching gap.
  • Category 2 refers to single-shot LBT without random back off, where the duration of time that the channel is sensed to be idle before the transmitting entity transmits is deterministic.
  • Category 3 refers to LBT with random back-off with a contention window of fixed size.
  • Category 4 refers to LBT with random back-off with a contention window of variable size, where the LBT procedure has the following as one of its components.
  • the transmitting entity draws a random number N within a contention window.
  • the size of contention window is specified by the minimum and maximum value of N.
  • the transmitting entity can vary the size of the contention window when drawing the random number N.
  • the random number N is used in the LBT procedure to determine the duration of time that the channel is sensed to be idle before the transmitting entity transmits on the channel.
  • DRS may include various signals and channels, such as synchronization signal block (SSB), which may further include a primary and a secondary synchronization signal, physical broadcast channel (PBCH), channel state information reference signals (CSI-RS), and remaining minimum system information (RMSI).
  • SSB synchronization signal block
  • PBCH physical broadcast channel
  • CSI-RS channel state information reference signals
  • RMSI remaining minimum system information
  • option 1 is SSBs are at symbols (2, 3, 4, 5) and (8,9, 10,11) in the slot
  • option 2 is SSBs are at symbols (2, 3, 4, 5) and (9, 10,11, 12) in the slot.
  • the pattern applies no matter if SSB short control signaling (SCS) is indicated by higher layer or not, and no matter if remaining minimum system inform tion (RMSI) is transmitted or not.
  • SCS SSB short control signaling
  • RMSI remaining minimum system inform tion
  • a UE may assume synchronization signal (SS)/physical broadcast channel (PBCH) blocks in the same candidate position within the DRS transmission window are quasi-co located (QCL) across DRS transmission windows.
  • SS synchronization signal
  • PBCH physical broadcast channel
  • PBCH demodulation reference signal (DMRS) sequence index is also the same, and a second alternative is the PBCH DMRS sequence index may be different. It is noted that the first candidate position of the DRS transmission window is located at the first half slot of a half frame of the DRS transmission window.
  • DMRS PBCH demodulation reference signal
  • Fig. 1 illustrates an example of one possible implementation of the above agreement.
  • the example of Fig. 1 shows two back-to-back half-frame DRS transmission windows.
  • the subcarrier spacing in this example is 30 kHz, and the corresponding slot duration is 0.5 ms.
  • a gNB Starting from the beginning of each DRS transmission window, a gNB attempts to transmit the SSBs.
  • ‘X’ denotes that channel was occupied in certain SSB candidate positions. In other words,‘X’ denotes that the LBT is not successful, thereby preventing SSB transmission.
  • the SSB candidate position before which the LBT is successful is different for the first (LBT successful before SSB candidate position 4) and the second DRS transmission window (LBT successful before SSB candidate position 4).
  • the SSB for beam # 0 is transmitted first, followed by beam #1, #2, and #3.
  • beam # 3 is transmitted first, followed by beam #0, #1, and #2.
  • transmission of four beams requires lms.
  • DRS SSB transmission is needed to maintain UEs’ synchronization in the cell, as well as to support RLM and RRM measurements.
  • the contended channel access present challenges to that. Under high contention, DRS SSB transmission are blocked due to an occupied channel.
  • Some measures to mitigate the challenge has been adopted in LTE LAA and MulteFire, such as a DRS transmission window of 5 ms, where DRS transmission may be attempted 5 times with an interval of 1 ms, or the use of Category 2 LBT instead of Cat 4 LBT.
  • the use of a DRS transmission window of 5 ms increases the DRS transmission opportunities at the price of increased UE battery consumption, as the UE needs to attempt DRS reception in multiple time instances instead of one.
  • the DRS transmission window is shorter than maximum channel occupancy time, the channel may remain occupied by some other device throughout the DRS transmission window. Meanwhile, with Category 2 LBT, channel can be accessed at a predetermined time instance more likely than with Category 4 LBT.
  • a UE may be configured to monitor for DRSs more frequently than would be necessary without the channel access uncertainty. Again, this comes with the price of increased UE battery consumption.
  • Category 2 LBT the straightforward application of Category 2 LBT for DRS is challenged.
  • the duration of a DRS SSB burst may increase in some cases beyond 1 ms due to, for example, multi-beam operation, where DRS needs to include separate SSB for each beam.
  • Category 2 LBT cannot be used anymore at least for all DRS transmission.
  • Some example embodiments provide solutions facilitating frequent enough DRS transmission, for example, in scenarios where relying only on Category 2 LBT for DRS with duty cycle of 5% or less, or a duration of 1 ms or less, is not sufficient.
  • Category 4 LBT has a worse channel access probability than Category 2 LBT for a predetermined transmission time instance, since the channel needs to be vacant in multiple time instances for Category 4 LBT to be successful; while Category 2 LBT performs only single time measurement. Lurthermore, when channel access leads to a collision, Category 4 LBT may involve a large back-off value, which means that it may not be possible to send DRS for a long time.
  • DRS transmission would be more frequently blocked (than with Category 2 LBT or combination of Category 2 LBT and Category 4 LBT) in harsh channel access contention situations.
  • a UE would need to monitor for DRS and/or opportunistic RS even more frequently, increasing UE battery consumption further.
  • Certain embodiments are able to improve the chances for transmitting DRS more regularly by defining two types of DRS transmission configurations or patterns.
  • the two types of DRS transmission configurations may include a first DRS and a second DRS that are defined according to certain properties, as discussed below.
  • the first DRS configuration may have at least some of the following properties: they may be transmitted after a 25 ps Category 2 single shot LBT, may follow the ETSI rules set for short control signaling (duty cycle, duration, etc.), may have minimized duration of transmission in time, that is at least less than 1 ms, may have limited additional content (RMSI may not be needed), and may be associated with a first subset of beams.
  • the second DRS configuration may have at least some of the following properties: they may be transmitted after Category 4 LBT (e.g., assuming highest traffic priority class); their transmission may have a longer duration in time such as up to 2 ms or more depending on the channel access priority class; the time domain location(s) of second DRS transmission window(s) may be defined relative to first DRS transmission window location(s), and the second DRS may be associated with a second subset of beams.
  • Category 4 LBT e.g., assuming highest traffic priority class
  • their transmission may have a longer duration in time such as up to 2 ms or more depending on the channel access priority class
  • the time domain location(s) of second DRS transmission window(s) may be defined relative to first DRS transmission window location(s)
  • the second DRS may be associated with a second subset of beams.
  • certain embodiments may also define the rules for interaction between the two DRS configurations such that an optimal DRS density can be obtained, taking into account success of LBT for DRS.
  • the interaction rules between the first and second DRS are configured so that DRS are transmitted as regularly as possible.
  • One embodiment may make use of the first DRS whenever possible within, e.g., regulatory bounds, but since that does not always suffice, there are also rules for how to complement the first DRS with the second DRS.
  • transmission of a second DRS is conditioned on the success of transmitting a first DRS (and potentially also second DRS at other time instances).
  • the first DRS(s) are transmitted always at predetermined time instances, provided that LBT is successful. This may be, for example, once in every DRS transmission window.
  • a DRS transmission window may occur periodically, e.g., once every 20, 40, or 80 ms, etc., and may comprise a number of SSB candidate locations (e.g. 5, 10 or 20 locations) where the first DRS transmission may be attempted.
  • At least some of the DRS transmission window locations for the second DRS may be conditioned on the success of transmission of the first DRS (i.e., depending on whether LBT prior to the first DRS transmission is successful or not). For example, a second DRS is transmitted if no first DRS have been transmitted in a given time window, or a second DRS is transmitted if no first or second DRS have been transmitted in a given time window.
  • one first DRS transmission window location can be associated with one or more second DRS transmission window location(s).
  • transmission of a first DRS may be conditioned on the success of transmission of a second DRS (i.e., depending on whether LBT prior to second DRS transmission is successful or not) on at least some of the preceding second DRS transmission window locations.
  • the first DRS is transmitted if no second DRS have been transmitted in a given time window (e.g., during the past 80 ms first DRS cycle). It is noted that a given time window is different from the DRS transmission window.
  • the first DRS are configured to be transmitted with a periodicity of 8 radio frames, i.e., 80 ms, and the duration of DRS transmission window is set to 10ms.
  • the DRS transmission takes place always if the channel is free prior to the transmission, i.e., LBT succeeds.
  • successful DRS transmissions are denoted with“T”, while“x” indicates a failed LBT.
  • the first DRS are configured to be transmitted with a periodicity of 8
  • the second DRS are configured to be transmitted with a periodicity of 2 radio frames (20 ms) such that each First DRS transmission window location is associated with four second DRS transmission window locations.
  • the transmissions are further conditioned on the success of previous first and previous second DRS transmissions.
  • a second DRS transmission (“T”) takes place only if a first or second DRS transmission has not occurred in the previous DRS transmission window time instance. Otherwise, the second DRS are omitted (“o”).
  • the interaction between the first and the second DRS configuration may work in an opposite manner from that discussed above.
  • the second DRS may be configured to be transmitted with Category 4 in the time instances labeled as“Primary DRS (Cat 2 LBT)” in Fig 2; while the first DRS may be transmitted with Category 2 LBT in the time instances labeled as“Secondary DRS (Cat 4 LBT)” in Fig. 2, e.g., on a per-need basis, depending on the success of LBT for preceding second DRS and first DRS.
  • periodicities can also be configured such that the first DRS (with Category 4) has a higher periodicity compared to the second DRS (with Category 2).
  • the first DRS and second DRS may utilize the same set of beams and a common definition for Q (i.e., number of beams).
  • Q i.e., number of beams
  • the first DRS duration may be restricted to have a duration of 1 ms or less.
  • the gNB may shorten the SSB burst and, as a consequence, SSBs for some beams will not be transmitted.
  • the gNB may shorten the SSB burst and, as a consequence, some beams will not be transmitted depending on where (in which SSB candidate position) the gNB acquires channel within the DRS transmission window.
  • the gNB may select the first DRS transmission time on SSB candidate positions for beams with the longest time interval since the previous SSB transmission (while maintaining 1 ms limit).
  • the consecutive first DRS time instances may vary (around configured periodicity) so that consecutive first DRS time instances contain SSB candidate positions for different beams while QCL assumption is maintained.
  • the structure of Category 2-based first DRS may be a subset of Category 4-based second DRS. It should be noted that all presented periodicities for DRS as well as, e.g., for DRS transmission window are merely examples. Different values may be determined or configured, according to other embodiments.
  • Fig. 3 illustrates another example depicting operation with multiple transmitted beams in SSB burst, according to the first embodiment.
  • the first DRS and the second DRS are configured with different sets of beams.
  • the second DRS provides an additional functionality for multi-beam operation.
  • the system can operate at least with a first DRS and a single beam with more reliable Category 2 LBT, while in times of low congestion of channel, the system can operate using also a second DRS with multiple beams, and also Category 4 LBT.
  • the first DRS have 20ms periodicity (i.e., 40 slots, where the duration of each slot is 0.5 ms), and the second DRS are transmitted with a periodicity 5ms. Therefore, each first DRS transmission window has four associated second DRS transmission windows.
  • the second DRS are always omitted (‘o’) when they collide with a first DRS transmission window, i.e., 1 st associated second DRS transmission window is never used.
  • the gNB manages to transmit a second DRS SSB burst and, therefore, in the 3 rd associated second DRS transmission window (starting from slot #20), the gNB does not attempt to transmit SSB burst.
  • a further indication may be carried, e.g., on PBCH belonging to each DRS transmission.
  • a UE may blindly search for a SSB, and it may find SSB in a first DRS or second DRS. As each SSB detected by the UE is self-contained, both frame timing as well as beam information can be recovered.
  • a UE assumes that periodicity for SSBs is 20ms (for combining), and the UE is informed only later on about actual periodicity. So, on initial access, the UE will just blindly try to search and decode a SSB in SSB burst.
  • Fig. 4a illustrates an example flow diagram of a method for configuring and/or transmitting DRS, according to one embodiment.
  • the flow diagram of Fig. 4a may be performed by a network node serving a cell, such as a base station, node B, eNB, gNB, or any other access node, or one or more servers in a 5GC or cloud configuration, for instance.
  • a network node serving a cell such as a base station, node B, eNB, gNB, or any other access node, or one or more servers in a 5GC or cloud configuration, for instance.
  • the method may include, at 400, defining two types of DRS transmission configurations.
  • a first of the two types of DRS transmission configurations may be a first DRS
  • a second of the two types of DRS transmission configurations may be a second DRS.
  • the method may then include, at 410, signaling to one or more UEs the configuration for the first DRS.
  • the configuration for the first DRS may include the candidate locations where the SSB(s) associated with the first DRS are transmitted depending on success of LBT.
  • the first DRS may be transmitted at predetermined time instances provided that LBT is successful. For example, in an embodiment, the predetermined time instances may be once in every DRS transmission window.
  • a DRS transmission window may occur periodically, such as once every 20, 40, or 80 ms, etc., and may include a number of SSB candidate locations (e.g., 5, 10 or 20 locations) where the first DRS transmission may be attempted.
  • the method may also include, at 420, signaling to the one or more UEs the configuration for the second DRS.
  • the configuration for the second DRS may include the candidate locations where the SSB(s) associated with the second DRS are transmitted depending on the success of LBT.
  • at least some of the DRS transmission window locations for the second DRS may be conditioned on the success of transmission of the first DRS (i.e., depending on whether LBT prior to the first DRS transmission is successful or not).
  • the signaling of the first DRS and/or second DRS may be performed using broadcast or UE-specific signaling.
  • the method of Fig. 4a may further include, at 430, performing channel access (LBT) of a first type according to the configuration and/or defined interaction rules for the interaction between the first DRS and second DRS. If LBT is successful at 432, then the method may include, at 435, transmitting the first DRS according to the configuration and/or defined interaction rules. If LBT is not successful at 432, then the method may include, at 440, performing channel access (LBT) of a second type according to the configuration and/or defined interaction rules. If LBT is successful at 442, then the method may include, at 445, transmitting the second DRS according to the configuration and/or the interaction rules.
  • LBT channel access
  • the interaction rules may include that the second DRS is transmitted if no first DRS have been transmitted in a predefined time window and/or the second DRS is transmitted if no first or second DRS have been transmitted in a predefined time window.
  • transmission of a first DRS may be conditioned on the success of the transmission of a second DRS on at least some of the preceding second DRS transmission window locations.
  • the interaction rules may include that the first DRS is transmitted if no second DRS have been transmitted in a predefined time window. It is noted that a predefined time window is different from the DRS transmission window.
  • the predefined time window may be defined in terms of time with a unit of slots, subframes or radio frames.
  • the predefined time window may be defined in terms of a number of previous DRS transmission windows, such that it includes one or more preceding DRS transmission windows.
  • one first DRS transmission window location may be associated with one or more second DRS transmission window locations.
  • the first DRS and second DRS may utilize the same set of beams and a common definition for Q, the number of beams.
  • the first DRS may be restricted to have a duration of 1 ms or less.
  • the method may optionally include shortening the SSB burst, which results in SSBs for some beams not being transmitted depending on which SSB candidate position the channel is acquired within the DRS transmission window.
  • the method may optionally include selecting the first DRS transmission time on SSB candidate positions for beams with the longest time interval since the previous SSB transmission, while maintaining the duration limit (e.g., 1 ms or less).
  • the method may optionally include varying the consecutive first DRS times (within the DRS transmission window) such that consecutive first DRS times contain SSB candidate positions for different beams while QCL assumption is maintained (that is, SSB candidate positions follow the SSB pattern).
  • channel access (LBT) of a first type may include Category 2 LBT or Category 4 LBT respectively
  • channel access of a second type may include the other of Category 4 LBT or Category 2 LBT respectively, for example as shown in Figs. 2 or 3.
  • Fig. 4b illustrates an example flow diagram of a method for configuring and/or transmitting DRS, according to one example embodiment.
  • the method of Fig. 4b may be performed by a mobile station, mobile device, UE, IoT device, terminal, or the like, for instance.
  • the method of Fig. 4b may include, at 450, receiving, from a network node, the configuration for a first DRS.
  • the configuration for the first DRS may include the DRS transmission window candidate locations where the SSB(s) associated with the first DRS are transmitted by the network node depending on success of LBT.
  • the first DRS may be transmitted by the network node at predetermined time instances provided that LBT performed by the network node is successful. For example, in an embodiment, the predetermined time instances may be once in every DRS transmission window.
  • the method may also include, at 460, receiving, from the network node, the configuration for a second DRS.
  • the configuration for the second DRS may include the DRS transmission window candidate locations where the SSB(s) associated with the second DRS are transmitted by the network node depending on the success of LBT.
  • at least some of the DRS transmission window candidate locations for the second DRS may depend on whether LBT performed by the network node prior to the first DRS transmission is successful.
  • the method may also include, at 470, performing detection of first DRS according to the received configuration.
  • the method may also include, at 480, performing detection of the second DRS according to the received configuration and/or defined interaction rules. For example, if first DRS is detected, then the performing 480 may further include performing detection of the second DRS according to the interaction rules between the first DRS and the second DRS. In an embodiment, if a first DRS is not detected, then the performing 480 may include performing detection of the second DRS according to the second DRS configuration and optionally depending on the prior detection of a second DRS.
  • apparatus 10 may be a node, host, or server in a communications network or serving such a network.
  • apparatus 10 may be a satellite, base station, a Node B, an evolved Node B (eNB), 5G Node B or access point, next generation Node B (NG-NB or gNB), and/or WLAN access point, associated with a radio access network, such as a LTE network, 5G or NR.
  • apparatus 10 may be an eNB in LTE or gNB in 5G.
  • apparatus 10 may be comprised of an edge cloud server as a distributed computing system where the server and the radio node may be stand-alone apparatuses communicating with each other via a radio path or via a wired connection, or they may be located in a same entity communicating via a wired connection.
  • apparatus 10 represents a gNB
  • it may be configured in a central unit (CU) and distributed unit (DU) architecture that divides the gNB functionality.
  • the CU may be a logical node that includes gNB functions such as transfer of user data, mobility control, radio access network sharing, positioning, and/or session management, etc.
  • the CU may control the operation of DU(s) over a front-haul interface.
  • the DU may be a logical node that includes a subset of the gNB functions, depending on the functional split option. It should be noted that one of ordinary skill in the art would understand that apparatus 10 may include components or features not shown in Fig. 5a. As illustrated in the example of Fig. 5a, apparatus 10 may include a processor 12 for processing information and executing instructions or operations. Processor 12 may be any type of general or specific purpose processor.
  • processor 12 may include one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as examples. While a single processor 12 is shown in Fig. 5a, multiple processors may be utilized according to other embodiments.
  • apparatus 10 may include two or more processors that may form a multiprocessor system (e.g., in this case processor 12 may represent a multiprocessor) that may support multiprocessing.
  • the multiprocessor system may be tightly coupled or loosely coupled (e.g., to form a computer cluster).
  • Processor 12 may perform functions associated with the operation of apparatus 10, which may include, for example, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 10, including processes related to management of communication resources.
  • Apparatus 10 may further include or be coupled to a memory 14 (internal or external), which may be coupled to processor 12, for storing information and instructions that may be executed by processor 12.
  • Memory 14 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and/or removable memory.
  • memory 14 can be comprised of any combination of random access memory (RAM), read only memory (ROM), static storage such as a magnetic or optical disk, hard disk drive (HDD), or any other type of non-transitory machine or computer readable media.
  • the instructions stored in memory 14 may include program instructions or computer program code that, when executed by processor 12, enable the apparatus 10 to perform tasks as described herein.
  • apparatus 10 may further include or be coupled to (internal or external) a drive or port that is configured to accept and read an external computer readable storage medium, such as an optical disc, USB drive, flash drive, or any other storage medium.
  • an external computer readable storage medium such as an optical disc, USB drive, flash drive, or any other storage medium.
  • the external computer readable storage medium may store a computer program or software for execution by processor 12 and/or apparatus 10.
  • apparatus 10 may also include or be coupled to one or more antennas 15 for transmitting and receiving signals and/or data to and from apparatus 10.
  • Apparatus 10 may further include or be coupled to a transceiver 18 configured to transmit and receive information.
  • the transceiver 18 may include, for example, a plurality of radio interfaces that may be coupled to the antenna(s) 15.
  • the radio interfaces may correspond to a plurality of radio access technologies including one or more of GSM, NB- IoT, LTE, 5G, WLAN, Bluetooth, BT-LE, NFC, radio frequency identifier (RFID), ultrawideband (UWB), MulteFire, and the like.
  • the radio interface may include components, such as filters, converters (for example, digital-to- analog converters and the like), mappers, a Fast Fourier Transform (FFT) module, and the like, to generate symbols for a transmission via one or more downlinks and to receive symbols (for example, via an uplink).
  • components such as filters, converters (for example, digital-to- analog converters and the like), mappers, a Fast Fourier Transform (FFT) module, and the like, to generate symbols for a transmission via one or more downlinks and to receive symbols (for example, via an uplink).
  • FFT Fast Fourier Transform
  • transceiver 18 may be configured to modulate information on to a carrier waveform for transmission by the antenna(s) 15 and demodulate information received via the antenna(s) 15 for further processing by other elements of apparatus 10.
  • transceiver 18 may be capable of transmitting and receiving signals or data directly.
  • apparatus 10 may include an input and/or output device (I/O device).
  • memory 14 may store software modules that provide functionality when executed by processor 12.
  • the modules may include, for example, an operating system that provides operating system functionality for apparatus 10.
  • the memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 10.
  • the components of apparatus 10 may be implemented in hardware, or as any suitable combination of hardware and software.
  • processor 12 and memory 14 may be included in or may form a part of processing circuitry or control circuitry.
  • transceiver 18 may be included in or may form a part of transceiving circuitry.
  • circuitry may refer to hardware-only circuitry implementations (e.g., analog and/or digital circuitry), combinations of hardware circuits and software, combinations of analog and/or digital hardware circuits with software/firmware, any portions of hardware processor(s) with software (including digital signal processors) that work together to case an apparatus (e.g., apparatus 10) to perform various functions, and/or hardware circuit(s) and/or processor(s), or portions thereof, that use software for operation but where the software may not be present when it is not needed for operation.
  • hardware-only circuitry implementations e.g., analog and/or digital circuitry
  • combinations of hardware circuits and software e.g., combinations of analog and/or digital hardware circuits with software/firmware
  • any portions of hardware processor(s) with software including digital signal processors
  • circuitry may also cover an implementation of merely a hardware circuit or processor (or multiple processors), or portion of a hardware circuit or processor, and its accompanying software and/or firmware.
  • the term circuitry may also cover, for example, a baseband integrated circuit in a server, cellular network node or device, or other computing or network device.
  • apparatus 10 may be a network node or RAN node, such as a base station, access point, Node B, eNB, gNB, WLAN access point, or the like. According to certain embodiments, apparatus 10 may be controlled by memory 14 and processor 12 to perform the functions associated with any of the embodiments described herein, such as the flow or signaling diagrams illustrated in Fig. 4a. In some embodiments, apparatus 10 may be configured to perform a procedure for configuring and/or transmitting DRS, for example.
  • apparatus 10 may be controlled by memory 14 and processor 12 to define two types of DRS transmission configuration, a first DRS and a second DRS.
  • apparatus 10 may be controlled by memory 14 and processor 12 to signal to one or more UEs the configuration for the first DRS.
  • the configuration for the first DRS may include the candidate locations where the SSB(s) associated with the first DRS are transmitted depending on the success of LBT.
  • apparatus 10 may be controlled by memory 14 and processor 12 to transmit the first DRS at predetermined time instances provided that LBT is successful. In one embodiment, the predetermined time instances may be once in every DRS transmission window.
  • a DRS transmission window may occur periodically, such as once every 20, 40, or 80 ms, etc., and may include a number of SSB candidate locations (e.g., 5, 10 or 20 locations) where the first DRS transmission may be attempted.
  • apparatus 10 may also be controlled by memory 14 and processor 12 to signal to the one or more UEs the configuration for the second DRS.
  • the configuration for the second DRS may include the candidate locations where the SSB(s) associated with the second DRS are transmitted depending on the success of LBT.
  • at least some of the DRS transmission window locations for the second DRS may be conditioned on the success of transmission of the first DRS or, in other words, depending on whether LBT prior to the first DRS transmission is successful.
  • apparatus 10 may be controlled by memory 14 and processor 12 to signal the first DRS and/or second DRS using broadcast or UE-specific signaling.
  • apparatus 10 may be controlled by memory 14 and processor 12 to perform channel access (LBT) of a first type and to transmit a first DRS according to the configuration and/or defined interaction rules for the interaction between the first DRS and second DRS. If the channel access for the first DRS is successful, then apparatus 10 may be controlled by memory 14 and processor 12 to perform channel access (LBT) of a second type and to transmit the second DRS according to the configuration and/or the interaction rules. If the channel access for first DRS is not successful, then apparatus 10 may be controlled by memory 14 and processor 12 to perform channel access (LBT) of a second type and to transmit the second DRS according to the configuration and/or optionally depending on the prior success of transmission of a second DRS.
  • LBT channel access
  • the interaction rules may include that the second DRS is transmitted if no first DRS have been transmitted in a predefined time window and/or the second DRS is transmitted if no first or second DRS have been transmitted in a predefined time window.
  • transmission of a first DRS may be conditioned on the success of the transmission of a second DRS on at least some of the preceding second DRS transmission window locations.
  • the interaction rules may include that the first DRS is transmitted if no second DRS have been transmitted in a predefined time window.
  • one first DRS transmission window location may be associated with one or more second DRS transmission window locations.
  • the first DRS and the second DRS may utilize the same set of beams and a common definition for Q, the number of beams.
  • Q is greater than 1 and SSBs for beams cannot be transmitted within 1 ms
  • the first DRS may be restricted to have a duration of 1 ms or less.
  • apparatus 10 may optionally be controlled by memory 14 and processor 12 to shorten the SSB burst, which results in SSBs for some beams not being transmitted depending on which SSB candidate position the channel is acquired within the DRS transmission window.
  • apparatus 10 may optionally be controlled by memory 14 and processor 12 to select the first DRS transmission time on SSB candidate positions for beams with the longest time interval since the previous SSB transmission, while maintaining the duration limit (e.g., 1 ms or less).
  • apparatus 10 may optionally be controlled by memory 14 and processor 12 to vary the consecutive first DRS time instances (around configured periodicity) such that consecutive first DRS time instances contain SSB candidate positions for different beams while QCL assumption is maintained.
  • apparatus 20 may be a node or element in a communications network or associated with such a network, such as a UE, mobile equipment (ME), mobile station, mobile device, stationary device, IoT device, or other device.
  • UE may alternatively be referred to as, for example, a mobile station, mobile equipment, mobile unit, mobile device, user device, subscriber station, wireless terminal, tablet, smart phone, IoT device, sensor or NB-IoT device, or the like.
  • apparatus 20 may be implemented in, for instance, a wireless handheld device, a wireless plug-in accessory, or the like.
  • apparatus 20 may include one or more processors, one or more computer-readable storage medium (for example, memory, storage, or the like), one or more radio access components (for example, a modem, a transceiver, or the like), and/or a user interface.
  • apparatus 20 may be configured to operate using one or more radio access technologies, such as GSM, LTE, LTE-A, NR, 5G, WLAN, WiFi, NB-IoT, Bluetooth, NFC, MulteFire, and/or any other radio access technologies. It should be noted that one of ordinary skill in the art would understand that apparatus 20 may include components or features not shown in Fig. 5b.
  • apparatus 20 may include or be coupled to a processor 22 for processing information and executing instructions or operations.
  • processor 22 may be any type of general or specific purpose processor.
  • processor 22 may include one or more of general- purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), and processors based on a multi-core processor architecture, as examples. While a single processor 22 is shown in Fig. 5b, multiple processors may be utilized according to other embodiments.
  • apparatus 20 may include two or more processors that may form a multiprocessor system (e.g., in this case processor 22 may represent a multiprocessor) that may support multiprocessing.
  • processor 22 may represent a multiprocessor
  • the multiprocessor system may be tightly coupled or loosely coupled (e.g., to form a computer cluster).
  • Processor 22 may perform functions associated with the operation of apparatus 20 including, as some examples, precoding of antenna gain/phase parameters, encoding and decoding of individual bits forming a communication message, formatting of information, and overall control of the apparatus 20, including processes related to management of communication resources.
  • Apparatus 20 may further include or be coupled to a memory 24 (internal or external), which may be coupled to processor 22, for storing information and instructions that may be executed by processor 22.
  • Memory 24 may be one or more memories and of any type suitable to the local application environment, and may be implemented using any suitable volatile or nonvolatile data storage technology such as a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, fixed memory, and/or removable memory.
  • memory 24 can be comprised of any combination of random access memory (RAM), read only memory (ROM), static storage such as a magnetic or optical disk, hard disk drive (HDD), or any other type of non-transitory machine or computer readable media.
  • the instructions stored in memory 24 may include program instructions or computer program code that, when executed by processor 22, enable the apparatus 20 to perform tasks as described herein.
  • apparatus 20 may further include or be coupled to (internal or external) a drive or port that is configured to accept and read an external computer readable storage medium, such as an optical disc, USB drive, flash drive, or any other storage medium.
  • an external computer readable storage medium such as an optical disc, USB drive, flash drive, or any other storage medium.
  • the external computer readable storage medium may store a computer program or software for execution by processor 22 and/or apparatus 20.
  • apparatus 20 may also include or be coupled to one or more antennas 25 for receiving a downlink signal and for transmitting via an uplink from apparatus 20.
  • Apparatus 20 may further include a transceiver 28 configured to transmit and receive information.
  • the transceiver 28 may also include a radio interface (e.g., a modem) coupled to the antenna 25.
  • the radio interface may correspond to a plurality of radio access technologies including one or more of GSM, LTE, LTE-A, 5G, NR, WLAN, NB-IoT, Bluetooth, BT- LE, NFC, RFID, UWB, and the like.
  • the radio interface may include other components, such as filters, converters (for example, digital-to-analog converters and the like), symbol demappers, signal shaping components, an Inverse Fast Fourier Transform (IFFT) module, and the like, to process symbols, such as OFDMA symbols, carried by a downlink or an uplink.
  • transceiver 28 may be configured to modulate information on to a carrier waveform for transmission by the antenna(s) 25 and demodulate information received via the antenna(s) 25 for further processing by other elements of apparatus 20.
  • transceiver 28 may be capable of transmitting and receiving signals or data directly.
  • apparatus 10 may include an input and/or output device (I/O device).
  • apparatus 20 may further include a user interface, such as a graphical user interface or touchscreen.
  • memory 24 stores software modules that provide functionality when executed by processor 22.
  • the modules may include, for example, an operating system that provides operating system functionality for apparatus 20.
  • the memory may also store one or more functional modules, such as an application or program, to provide additional functionality for apparatus 20.
  • the components of apparatus 20 may be implemented in hardware, or as any suitable combination of hardware and software.
  • apparatus 20 may optionally be configured to communicate with apparatus 10 via a wireless or wired communications link 70 according to any radio access technology, such as NR.
  • processor 22 and memory 24 may be included in or may form a part of processing circuitry or control circuitry.
  • transceiver 28 may be included in or may form a part of transceiving circuitry.
  • apparatus 20 may be a UE, mobile device, mobile station, ME, IoT device and/or NB-IoT device, for example.
  • apparatus 20 may be controlled by memory 24 and processor 22 to perform the functions associated with example embodiments described herein.
  • apparatus 20 may be configured to perform one or more of the processes depicted in any of the flow charts or signaling diagrams described herein, such as the flow diagrams illustrated in Figs. 5a or 5b.
  • apparatus 20 may be configured to perform a procedure for receiving time reference information for multiple clock domains, for instance.
  • apparatus 20 may be controlled by memory 24 and processor 22 to receive, from a network node, the configuration for a first DRS.
  • the configuration for the first DRS may include the candidate locations where the SSB(s) associated with the first DRS are transmitted depending on success of LBT.
  • the first DRS may be transmitted at predetermined time instances provided that LBT is successful. For example, in an embodiment, the predetermined time instances may be once in every DRS transmission window.
  • apparatus 20 may be controlled by memory 24 and processor 22 to receive, from the network node, the configuration for a second DRS.
  • the configuration for the second DRS may include the candidate locations where the SSB(s) associated with the second DRS are transmitted depending on the success of LBT.
  • at least some of the DRS transmission window locations for the second DRS may depend on whether LBT prior to the first DRS transmission is successful.
  • apparatus 20 may be controlled by memory 24 and processor 22 to performing detection of a first DRS according to the received configuration.
  • apparatus 20 may be controlled by memory 24 and processor 22 to perform detection of a second DRS according to the interaction rules between the first DRS and the second DRS.
  • apparatus 20 may be controlled by memory 24 and processor 22 to perform detection of a second DRS according to the second DRS configuration and optionally depending on the prior detection of a second DRS. Therefore, certain example embodiments provide several technical improvements, enhancements, and/or advantages. For instance, example embodiments ensure frequent enough DRS transmission, for example, in cases where LBT Category 2 based DRS transmissions do not suffice. These cases may include, for instance, where there is frequent Category 2 LBT failures for DRS, DRS having a duration larger than 1 ms (e.g., multi-beam operation), or allow duty cycle for Short Control Signaling (with Cat 2 LBT) is reduced below 5%.
  • Category 2 LBT for DRS allows for less frequent monitoring for DRS transmissions than a scheme relying solely on Category 4 LBT.
  • monitoring of second DRS is conditional on failed detection of first DRS.
  • any of the methods, processes, signaling diagrams, algorithms or flow charts described herein may be implemented by software and/or computer program code or portions of code stored in memory or other computer readable or tangible media, and executed by a processor.
  • an apparatus may be included or be associated with at least one software application, module, unit or entity configured as arithmetic operation(s), or as a program or portions of it (including an added or updated software routine), executed by at least one operation processor.
  • Programs also called program products or computer programs, including software routines, applets and macros, may be stored in any apparatus- readable data storage medium and may include program instructions to perform particular tasks.
  • a computer program product may include one or more computer-executable components which, when the program is run, are configured to carry out some example embodiments.
  • the one or more computer-executable components may be at least one software code or portions of code. Modifications and configurations required for implementing functionality of an example embodiment may be performed as routine(s), which may be implemented as added or updated software routine(s). In one example, software routine(s) may be downloaded into the apparatus.
  • software or a computer program code or portions of code may be in a source code form, object code form, or in some intermediate form, and it may be stored in some sort of carrier, distribution medium, or computer readable medium, which may be any entity or device capable of carrying the program.
  • carrier may include a record medium, computer memory, read-only memory, photoelectrical and/or electrical carrier signal, telecommunications signal, and/or software distribution package, for example.
  • the computer program may be executed in a single electronic digital computer or it may be distributed amongst a number of computers.
  • the computer readable medium or computer readable storage medium may be a non-transitory medium.
  • the functionality may be performed by hardware or circuitry included in an apparatus (e.g., apparatus 10 or apparatus 20), for example through the use of an application specific integrated circuit (ASIC), a programmable gate array (PGA), a field programmable gate array (FPGA), or any other combination of hardware and software.
  • ASIC application specific integrated circuit
  • PGA programmable gate array
  • FPGA field programmable gate array
  • the functionality may be implemented as a signal, such as a non-tangible means that can be carried by an electromagnetic signal downloaded from the Internet or other network.
  • an apparatus such as a node, device, or a corresponding component, may be configured as circuitry, a computer or a microprocessor, such as single-chip computer element, or as a chipset, which may include at least a memory for providing storage capacity used for arithmetic operation(s) and/or an operation processor for executing the arithmetic operation(s).
  • a first embodiment is directed to a method that may be performed by a network node.
  • the method may include defining two types of DRS transmission configuration including a first DRS and a second DRS.
  • the method may then include signaling to one or more UEs the configuration for the first DRS.
  • the configuration for the first DRS may include the candidate locations where the SSB(s) associated with the first DRS are transmitted depending on success of LBT.
  • the method may also include signaling to the one or more UEs the configuration for the second DRS.
  • the configuration for the second DRS may include the candidate locations where the SSB(s) associated with the second DRS are transmitted depending on the success of LBT.
  • the method may also include performing channel access (LBT) of a first type and transmitting first DRS according to the configuration and/or defined interaction rules for the interaction between the first DRS and second DRS.
  • LBT channel access
  • the first DRS may be transmitted at predetermined time instances provided that LBT is successful.
  • the predetermined time instances may be once in every DRS transmission window.
  • at least some of the DRS transmission window locations for the second DRS may be conditioned on the success of transmission of the first DRS.
  • the signaling of the first DRS and/or the signaling of the second DRS may be performed using broadcast or UE-specific signaling.
  • the performing of the channel access may include performing channel access (LBT) of a second type and transmitting the second DRS according to the configuration and/or the interaction rules.
  • the performing of the channel access may include performing channel access (LBT) of a second type and transmitting the second DRS according to the configuration and/or optionally depending on the prior success of transmission of second DRS.
  • the interaction rules may include that the second DRS is transmitted if no first DRS have been transmitted in a predefined time window and/or the second DRS is transmitted if no first or second DRS have been transmitted in a predefined time window.
  • transmission of the first DRS may be conditioned on the success of the transmission of the second DRS on at least some of the preceding second DRS transmission window locations.
  • the interaction rules may include that the first DRS is transmitted if no second DRS have been transmitted in a predefined time window. It is noted that a predefined time window is different from the DRS transmission window.
  • one first DRS transmission window location may be associated with one or more second DRS transmission window locations.
  • the first DRS and second DRS may utilize the same set of beams and a common definition for Q, the number of beams.
  • the method may optionally include shortening the SSB burst, which results in SSBs for some beams not being transmitted depending on which SSB candidate position the channel is acquired within the DRS transmission window.
  • the method may optionally include selecting the first DRS transmission time on SSB candidate positions for beams with the longest time interval since the previous SSB transmission, while maintaining the duration limit.
  • the method may optionally include varying the consecutive first DRS time instances such that consecutive first DRS time instances contain SSB candidate positions for different beams while QCL assumption is maintained.
  • channel access (LBT) of a first type may include Category 2 LBT or Category 4 LBT
  • channel access of a second type may include the other of Category 2 LBT or Category 4 LBT.
  • a second embodiment is directed to a method that may be performed by a UE.
  • the method may include receiving, from a network node, the configuration for a first DRS.
  • the configuration for the first DRS may include the DRS transmission window candidate locations where the SSB(s) associated with the first DRS are transmitted depending on success of LBT.
  • the method may also include receiving, from the network node, the configuration for a second DRS.
  • the configuration for the second DRS may include the candidate locations where the SSB(s) associated with the second DRS are transmitted depending on the success of LBT.
  • the method may also include performing detection of first DRS according to the received configuration.
  • the performing of the detection may further include performing detection of the second DRS according to the interaction rules between the first DRS and the second DRS.
  • the performing of the detection may further include performing detection of the second DRS according to the second DRS configuration and optionally depending on the prior detection of a second DRS.
  • a third embodiment is directed to an apparatus including at least one processor and at least one memory comprising computer program code.
  • the at least one memory and computer program code may be configured, with the at least one processor, to cause the apparatus at least to perform the method according to the first embodiment or the second embodiment, or any of their variants.
  • a fourth embodiment is directed to an apparatus that may include circuitry configured to perform the method according to the first embodiment or the second embodiment, or any of the variants discussed above.
  • a fifth embodiment is directed to an apparatus that may include means for performing the method according to the first embodiment or the second embodiment, or any of the variants discussed above.
  • a sixth embodiment is directed to a computer readable medium comprising program instructions stored thereon for performing at least the method according to the first embodiment or the second embodiment, or any of the variants discussed above.

Abstract

L'invention concerne des systèmes, des procédés, des appareils et des produits-programmes informatiques pour la configuration et/ou la transmission de signaux de référence de découverte (DRS).
PCT/EP2020/057476 2019-03-28 2020-03-18 Mécanisme amélioré d'écoute avant transmission pour des signaux de référence de découverte sans licence de nouvelle radio WO2020193317A1 (fr)

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