WO2021031006A1 - Détection de signaux phasés - Google Patents

Détection de signaux phasés Download PDF

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Publication number
WO2021031006A1
WO2021031006A1 PCT/CN2019/101179 CN2019101179W WO2021031006A1 WO 2021031006 A1 WO2021031006 A1 WO 2021031006A1 CN 2019101179 W CN2019101179 W CN 2019101179W WO 2021031006 A1 WO2021031006 A1 WO 2021031006A1
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WO
WIPO (PCT)
Prior art keywords
search space
signal
frame period
detection
space set
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PCT/CN2019/101179
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English (en)
Inventor
Jianguo Liu
Tao Tao
Karol Schober
Esa Tiirola
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 PCT/CN2019/101179 priority Critical patent/WO2021031006A1/fr
Priority to CN201980099367.4A priority patent/CN114223294A/zh
Publication of WO2021031006A1 publication Critical patent/WO2021031006A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • Example embodiments of the present disclosure generally relate to the field of communications, and in particular, to a device, method, apparatus and computer readable storage medium for phased signal detection in a frame period.
  • New Radio (NR) based access to Unlicensed Spectrum is specified in the third Generation Partnership Project (3GPP) standardization.
  • NR-U frame based equipment
  • FBE frame based equipment
  • the FBE may comprise both a network device such as a base station and a terminal device such as user equipment (UE) .
  • the FBE operation needs to be aligned with the regulatory requirements.
  • ETSI European Telecommunications Standards Institute
  • BRAN Broadband Radio Access Networks
  • CCA Clear Channel Assessment
  • LBT Listen Before Talk
  • RLAN Radio Local Access Network
  • FBE based frame structure is being developed.
  • example embodiments of the present disclosure provide a device, method, apparatus and computer readable storage medium for phased signal detection in a frame period.
  • a first device which comprises at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to perform detection for a first signal from a second device in at least a first search space set within a frame period.
  • the first device is caused to determine whether the first signal is detected in the at least first search space set within the frame period.
  • the first device is further caused to in response to determining that the first signal is detected in the at least first search space set, perform detection for a second signal from the second device in at least a second search space set associated with the first search space set within the frame period.
  • a method in the method, a first device performs detection for a first signal from a second device in at least a first search space set within a frame period. The first device determines whether the first signal is detected in the at least first search space set within the frame period. If it is determined that the first signal is detected in the at least first search space set, the first device performs detection for a second signal from the second device in at least a second search space set associated with the first search space set within the frame period.
  • an apparatus comprising means for performing the method according to the second aspect.
  • a computer readable storage medium comprising program instructions stored thereon. The instructions, when executed by a processor of a device, cause the device to perform the method according to the second aspect.
  • FIG. 1 illustrates a conventional FBE framework
  • FIG. 2 illustrates a conventional FBE-based frame structure (FS)
  • FIG. 3 illustrates an example environment in which example embodiments of the present disclosure can be implemented
  • FIG. 4 illustrates a flowchart of an example method according to some example embodiments of the present disclosure
  • FIG. 5 illustrates an example SS set configuration within a frame period according to some example embodiments of the present disclosure
  • FIG. 6 illustrates an example SS set configuration within two successive frame periods according to some example embodiments of the present disclosure.
  • FIG. 7 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.
  • terminal device or “user equipment” (UE) refers to any terminal device capable of wireless communications with each other or with the base station.
  • the communications may involve transmitting and/or receiving wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over air.
  • the UE may be configured to transmit and/or receive information without direct human interaction. For example, the UE may transmit information to the base station on predetermined schedules, when triggered by an internal or external event, or in response to requests from the network side.
  • Examples of the UE include, but are not limited to, smart phones, wireless-enabled tablet computers, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , wireless customer-premises equipment (CPE) , sensors, metering devices, personal wearables such as watches, and/or vehicles that are capable of communication.
  • LEE laptop-embedded equipment
  • LME laptop-mounted equipment
  • CPE wireless customer-premises equipment
  • sensors metering devices
  • personal wearables such as watches, and/or vehicles that are capable of communication.
  • UE may also correspond to Mobile Termination (MT) part of the integrated access and backhaul (IAB) node (a.k.a. a relay node) .
  • MT Mobile Termination
  • IAB integrated access and backhaul
  • the term “network device” refers to a device via which services can be provided to a terminal device in a communication network.
  • the network device may comprise a base station.
  • the term “base station” refers to a network device via which services can be provided to a terminal device in a communication network.
  • the base station may comprise any suitable device via which a terminal device or UE can access the communication network.
  • Examples of the base stations include a relay, an access point (AP) , a transmission point (TRP) , a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a New Radio (NR) NodeB (gNB) , a Remote Radio Module (RRU) , a radio header (RH) , a remote radio head (RRH) , a low power node such as a femto, a pico, and the like.
  • a relay node may correspond to Distributed Unit (DU) part of the IAB node.
  • search space set refers to a set of time-domain resources or locations for a receiver to monitor or detect a signal from a transmitter.
  • the receiver may be implemented by a terminal device or a network device, and the transmitter may also be implemented by a terminal device or a network device.
  • the search space set indicates all possible locations of a Physical Downlink Control Channel (PDCCH) for a terminal device to detect.
  • PDCCH Physical Downlink Control Channel
  • Each search space may be associated with a CORESET (Control resource set) which may define, for example, the resource elements (such as OFDM symbols, sub-carriers) available for the associated search space set.
  • circuitry may refer to one or more or all of the following:
  • combinations of hardware circuits and software such as (as applicable) : (i) a combination of analog and/or digital hardware circuit (s) with software/firmware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular base station, or other computing or base station.
  • first As used herein, the terms “first” , “second” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be referred to as a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms.
  • FIG. 1 shows an example FBE framework 100.
  • FFP 105 two successive FFPs 105-1 and 105-2 (collectively or individually referred to as a FFP 105) are illustrated. It is to be understood that detection may be performed in any suitable number of FFPs.
  • An initiating device can occupy a channel at the beginning of a FFP 105 after a one-shot LBT based CCA 120, and initiates transmission from the beginning of the FFP 105.
  • the initiating device can perform multiple communications in different directions.
  • the initiating device may grant an authorization to one or more associated responding devices such as terminal devices to transmit on the current operating channel within the current FFP 105.
  • the operation through a FBE framework has periodic timing with a periodicity equal to the FFP 105.
  • the FFP 105 may be within a range of 1 to 10 ms, and the FFP 105 can be changed no more than once every 200 ms. Moreover, as shown, it is required that within each FFP 105, a channel occupancy time (COT) 110 acquired by an initiating device is no greater than 95%of the FFP 105. At the tail of each FFP 105, an idle period 115 is left which is no less than at least 5%of the FFP 105 with a minimum of 100 ⁇ s.
  • COT channel occupancy time
  • FIG. 2 shows an example FBE-based FS 200 which can be followed by a NR nodeB (or gNB) operating on a 5 GHz unlicensed band.
  • Example configuration for the FBE-based FS 200 is shown in Table 1.
  • FFP (ms) 4 Sub-carrier spacing (SCS) (kHz) 30 Number of slots per subframe 2 Number of slots per FFP 8 Number of slots in COT (95%) 7.6 Number of full slots in COT 7 Number of available symbols of last slot 8.4 Number of available full symbols of last slot 8 Number of Guard Period (GP) symbols in idle period (5%) 6
  • a FFP 105 is 4ms and includes eight slots 205 of 0.5ms, and each slot 205 includes 14 symbols 210.
  • the COT 110 occupies 7 full slots 205 and 8 full symbols 210 of the last slot 205, and the idle period 115 occupies 6 symbols 210 of the last slot 205.
  • the FBE-based FS can be indicated by the gNB to the UE with parameters such as an offset and periodicity of a FFP, for example, by using high layer signaling such as a system information block (SIB) or Layer 1 (L1) signaling such as dedicated control information (DCI) .
  • SIB system information block
  • L1 Layer 1
  • NR-U For NR-U, it’s agreed to take the FBE operation in the specifications (such as ETSI BRAN specifications) as the baseline. If the gNB acts as an initiating device and UEs act as the responding devices as defined in the ETSI regulation, the gNB can acquire the COT by performing one-shot LBT, and all downlink (DL) and uplink (UL) transmissions can be transmitted inside the COT acquired by the gNB.
  • the specifications such as ETSI BRAN specifications
  • the FBE operation is specified to include the following:
  • the gNB acquires a COT with Category 2 (Cat 2) immediately prior to a FFP.
  • Category 1 (Cat 1) can be used by the gNB and associated UEs.
  • Cat 2 should be used by the gNB and the associated UEs.
  • LAA Licensed-Assisted Access
  • LTE-U Long Term Evolution
  • a UE monitors a DL control channel at the slot boundaries (twice a 1ms subframe, for example in the case of 30 kHz subcarrier spacing) to enable the base station to start a COT with the granularity of 0.5ms without using reservation signals.
  • the gNB may use 30kHz sub-carrier spacing (SCS) and up to 7 starting positions within a slot (that is, one starting position each 1/14 ms) according to the 3GPP specifications.
  • SCS sub-carrier spacing
  • the higher SCS or shorter slot duration and more starting positions within a slot can allow the gNB to access an available channel faster and therefore achieve more transmission efficiency by minimizing the transmission of reservation signals.
  • the UE is required to monitor the DL control channel more frequently.
  • the monitoring of the DL control channel is power consuming.
  • a large amount of control channel decoding occurs in subframes or slots where the UE receives no grant or scheduling since the gNB may not even get access to the channel due to LBT failures. It would be desirable to reduce UE complexity (and power consumption) by reducing DL burst or PDCCH monitoring when it is not needed.
  • LBE load based equipment
  • DMRS Demodulation Reference Signal
  • Phase A is outside of gNB’s channel occupancy where the UE may determine the presence of gNB’s DL transmission.
  • Phase B is at the beginning (for example, an initial slot) of gNB’s channel occupancy.
  • Phase C is at the remaining part (for example, other slots than the initial slot) of gNB’s channel occupancy.
  • the 3GPP specifications such as 3GPP TR 38.889 allow dynamical change of the time-domain time instances in which the UE is expected to receive a Physical Downlink Control Channel (PDCCH) , modifications for enabling Discovery Reference Signal (DRS) transmissions without gaps in a time domain, and an indication of a time-domain COT structure.
  • PDCCH Physical Downlink Control Channel
  • DRS Discovery Reference Signal
  • the UE may switch between two PDCCH configurations (for more frequent and less frequent detections) at the first and last slot boundaries of a COT.
  • the UE may determine a specific monitoring configuration to apply as a function of an explicit indication for example by DCI, or an implicit indication based on relations to the start of a detected DL burst or a configured window.
  • the following proposals are being discussed to enable the UE to change the monitoring behavior for a PDCCH or a Group Common PDCCH (GC-PDCCH) where the monitoring behavior may occur based on Control Resource Set (CORESET) and search space parameters:
  • CORESET Control Resource Set
  • ⁇ Indication for example, by a DCI content or DCI Cyclic Redundancy Check (CRC) passing
  • CRC Cyclic Redundancy Check
  • an initiating device for example, the gNB
  • the gNB can only occupy a channel at the beginning of a FFP with one-shot LBT, and the transmission can be initiated at the beginning of the FFP. This means that if the gNB doesn’t acquire a channel at the beginning of a FFP, it will not initiate any transmission including DL burst transmission in the FFP.
  • Example embodiments of the present disclosure provide a phased monitoring scheme based on a novel search space design in a frame period (for example, a FFP) .
  • This scheme defines search-space dependency between different types of search space (SS) sets in a frame period.
  • SS search space
  • the different types of SS sets may be configured with different monitoring granularities or periodicity.
  • One type of SS sets is first monitored in the frame period. If a signal is detected in at least one SS set of this type within the frame period, the signal detection is initiated in a SS set of a further type associated with the at least one SS set within the frame period.
  • the SS sets detected at first will be referred to as independent SS sets, and the SS sets detected secondly will be referred to as dependent SS sets.
  • the UE may first perform blind detection for the start of a COT from the beginning of a frame period (for example, a FFP) in at least one independent SS set. If the start of a COT is detected in one of the independent SS sets, the UE starts monitoring in a dependent SS set associated with the independent SS sets until the end of the COT within the frame period. If the UE detects that the gNB does not acquire a channel at the beginning of the frame period within monitoring occasions of the independent SS, the UE may stop monitoring the DL transmission, which would be beneficial to reduce the monitoring complexity and power consumption at the UE.
  • FIG. 3 shows an example environment 300 in which example embodiments of the present disclosure can be implemented.
  • the environment 300 which may be a part of a communication network, comprises two devices 310 and 320 which are referred to as a first device 310 and a second device 320, respectively, and can communicate with each other or with other devices via each other.
  • the first and second devices 310 and 320 may be implemented by any suitable devices in the communication network.
  • the first device 310 may be implemented by a terminal device and the second device 320 may be implemented by a network device, or vice versa.
  • the first and second devices 310 and 320 may be both implemented by terminal devices or network devices.
  • the terminal device will be taken as an example of the first device 310
  • the network device will be taken as an example of the second device 320.
  • the communication may follow any suitable communication standards or protocols, which are already in existence or to be developed in the future, such as Universal Mobile Telecommunications System (UMTS) , long term evolution (LTE) , LTE-Advanced (LTE-A) , the fifth generation (5G) New Radio (NR) , Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiplexing (OFDM) , time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, and machine type communication (MTC) , enhanced mobile broadband (eMBB) , massive machine type communication (mMTC) , ultra-reliable low latency communication (URLLC) , Carrier Aggregation (CA) , Dual Connection (DC) , and New Radio Unlicense
  • the first and second devices 310 and 320 can operate on the unlicensed spectrum and/or licensed spectrum.
  • the first and second devices 310 and 320 can communicate within a frame period.
  • the frame period may be fixed, such as a FFP 105 as shown in FIGS. 1 and 2.
  • the frame period may also be dynamically configured.
  • At least two types of SS sets are configured for the communication between the first and second devices 310 and 320 within the frame period.
  • the first device 310 first detects a signal from the second device 320 in one or more independent SS sets within the frame period. If the signal is detected in at least one of the independent SS sets, the first device 310 detects a further signal from the second device 320 in one or more dependent SS sets associated with the at least one independent SS sets within the frame period. If no signal is detected, the first device 310 will not initiating the monitoring in any dependent SS set until the next monitoring occasion in the independent SS set and further until the next frame period. In this way, the first device 310 conditionally monitors the dependent SS set (s) based on the output of monitoring in the independent SS set (s) , which would be beneficial to UE monitoring complexity reduction and power saving.
  • FIG. 4 shows a flowchart of an example method 400 according to some example embodiments of the present disclosure.
  • the method 400 can be implemented by the first device 310 as shown in FIG. 3.
  • the method 400 will be described with reference to FIG. 3.
  • the first device 310 performs detection for a signal (referred to as a first signal) from the second device 320 in at least one SS set (referred to as a first SS set) within a frame period.
  • the first SS set may be an independent SS set, or a dependent SS set that will be depended by a further dependent SS set.
  • the frame period may be timing-fixed such as a FFP 105 as shown in FIGS. 1 and 2. Alternatively or in addition, the frame period may be dynamically or semi-statically configured.
  • the UE may be configured also with multiple SS sets associated to different fixed frame periods. For example, one SS set may be associated to a FFP of 8 ms, and another SS set may be associated to a FFP of 2 ms, respectively.
  • the first signal may comprise any suitable signal transmitted on the unlicensed or licensed spectrum (or band) .
  • the first signal may indicate that a channel is occupied by the second device 320 on the unlicensed spectrum, for example.
  • the first signal may indicate a start of a COT acquired by the second device 320.
  • the first signal may comprise unicast or broadcast signaling or be in a form of a sequence.
  • the first signal may comprise a signal sent on a PDCCH or a GC-PDCCH.
  • the first signal may comprise sequence such as a wideband DMRS (WB-DMRS) and a Wi-Fi like preamble to further reduce the power consumption of the first device 310.
  • WB-DMRS wideband DMRS
  • the first signal may also comprise a signal sent on a PDCCH and a GC-PDCCH.
  • the first signal may be combination of the sequence of WB-DMRS and the signal sent on the PDCCH.
  • the detection for the first signal may comprise the blind detection in the at least first SS set within the frame period.
  • the first device 310 may also perform the detection for the first signal in other SS sets within the frame period. It would be also possible that only the first SS set is configured within the frame period. In this case, the first device 310 monitors only the first SS set within the frame period for the first signal from the second device 320.
  • the first SS set and other SS sets may be configured for a frame period configuration (referred to as a first frame period configuration) .
  • Different frame periods may have different frame period configurations. It would be possible that a plurality of successive frame periods have the same frame period configuration. If the first frame period configuration is changed to a different second frame period configuration, the detection in the first SS set may be ceased, and the detection for the first signal may be performed in one or more SS sets associated with the second frame period configuration. In another example, multiple SS sets associated with different frame period configurations are monitored in parallel.
  • the SS sets for the detection of the first signal may be associated with different services.
  • the first SS set may be associated with one service such as an eMBB service.
  • One or more further SS sets may also be configured for the detection of the first signal.
  • the first device 310 may perform the detection for the first signal in the one or more further SS sets within the frame period while performing the detection in the first SS set.
  • the further SS sets may be associated with one or more different further services such as a URLLC service and other services.
  • Different SS sets associated with different services may have different granularities of monitoring occasions. For example, the service with the higher latency requirement may be associated with the SS set with the smaller granularity to ensure the higher latency requirement.
  • the first device 310 determines whether the first signal is detected in the at least first SS set within the frame period. At block 415, if it is determined that the first signal is detected in the at least first SS set, the first device 310 detects a further signal (referred to as a second signal) from the second device 320 in at least a SS set (referred to as a second SS set) associated with the first SS set within the frame period. There may be a plurality of SS sets (including the second SS set) associated with the first SS set. In this case, the first device 310 performs the detection for the second signal in the plurality of SS sets within the frame period.
  • a further signal referred to as a second signal
  • the second signal may comprise any suitable signal associated with the first signal.
  • the second signal may comprise DCI.
  • the first device 310 may monitor DCI in the second SS set until the end of the COT within the frame period, for unicast or broadcast DCI delivery.
  • detecting the second signal may correspond to monitoring of DCI.
  • the second SS set may be further associated with one or more further SS sets for the detection of the first signal within the frame period. For example, if a plurality of SS sets is configured for the detection of the first signal within the frame period, the second SS set may be associated with all or at least a subset of the first plurality of SS sets.
  • FIG. 5 shows an example SS set configuration 500 within a frame period 505 according to some example embodiments of the present disclosure.
  • the frame period 505 is implemented by a FFP 105 as shown in FIGS. 1 and 2, which includes 8 slots 205, each slot 205 including 14 symbols 210.
  • the first SS set 510 is configured to be associated with the second SS set 515 and a further SS set 520, labeled as SS set #1, SS set #2 and SS set #3, respectively.
  • the first SS set 510 is configured from the beginning of the frame period 505 with half-slot periodicity in the first two slots 205.
  • the first signal is implemented by a signal sent on a PDCCH or GC-PDCCH. Accordingly, in the first SS set 510, PDCCH candidates may be detected with GC-PDCCH Radio Network Temporary Identity (RNTI) or Cell-RNTI (C-RNTI) .
  • RNTI Radio Network Temporary Identity
  • C-RNTI Cell-RNTI
  • the second SS set 515 occupies one symbol 210 with two-slot periodicity over all the slots 205, and the further SS set 520 occupies two symbols 210 with one-slot periodicity over all the slots 205.
  • the second SS set 515 is configured with GC-PDCCH RNTI and the further SS set 520 is configured with C-RNTI for the signal detection.
  • the locations or monitoring occasions of the first and second SS sets and other SS sets may be obtained by the first device in any suitable way.
  • the location of a SS set may be indicated by parameters such as an offset (for example, a starting position in the time domain) , periodicity (for example, a slot periodicity) and time duration (for example, the number of symbols) .
  • These parameters may indicate an absolute position of the SS set in a time domain, for example, by a subframe number, a slot number and a symbol number, or their modulo.
  • these parameters may indicate a relative position of the SS set with respect to a frame period.
  • an offset of the SS set may be indicated with respect to the beginning of the frame period.
  • the SS set may be periodically repeated with a given monitoring pattern within a frame period. Accordingly, the number of repetitions or/and the monitoring pattern of the SS set may be indicated with respect to the frame period.
  • the monitoring locations of the respective SS sets may be pre-configured or dynamically configured in a network.
  • the first device 310 may receive an indication of SS set configuration from the network side via the second device 320, for example.
  • the first device 310 may receive the indication from the second device 320 via higher layer signaling such as Radio Resource Control (RRC) signaling, for example.
  • RRC Radio Resource Control
  • Other signaling may also be used by the second device 320 to indicate the SS set configuration to the first device 310.
  • the association between the independent SS sets (such as the first SS set) and dependent SS sets (such as the second SS set) may also be pre-configured or dynamically indicated in the network. Accordingly, the first device 310 may obtain the association from the network side via the second device 320. For example, the first device 310 may receive an indication of the association between the first and second SS sets from the second device 320.
  • a bit information indication may be used to indicate the association. For example, if the second SS set is associated with all of the SS sets configured for the detection of the first signal within the frame period, the association may be indicated by only one bit to indicate the linkage of the second SS set to all the SS sets for the detection of the first signal. Alternatively or in addition, a bitmap may be used to indicate the linkage of the second SS set to all or just a subset of the first plurality of SS sets.
  • the first device 310 may cease the detection of the first signal in the further SS sets until a next frame period.
  • the ceasing may be implemented by default. Alternatively or in addition, the ceasing may be triggered based on explicit signaling. For example, if only data for one service will be transmitted to the first device 310, the first device 310 receives an indication for ceasing the detection for at least the first signal in a SS set associated with a different service, the first device 310 may cease the detection for the first signal in the further SS sets associated with the different services. The indication may indicate the ceasing of the detection of other signals or information that may be sent in parallel with the first signal. The indication of the ceasing may be implemented by explicit signaling, for example a DCI, transmitted in the first SS set associated with the service and/or the second SS set associated with the first SS set.
  • explicit signaling for example a DCI
  • the first device 310 determines at block 410 that the first signal is undetected in the first SS set, the first device 310 will suspend detecting or monitoring in any SS set configured within the frame period until the next frame period. As such, the complexity and power consumption may be reduced at the first device 310.
  • the search-space dependency provides flexibility for monitoring with diversity services or FBE configurations. It is also possible to provide an indication implicitly by determining that the first signal is detected from one out of multiple SS sets while monitoring in parallel multiple SS sets having different frame period configurations.
  • Example monitoring behaviors at the first device 310 will be discussed with reference to FIG. 6 which shows an example SS set configuration 600 according to some example embodiments of the present disclosure according to some example embodiments of the present disclosure.
  • FIG. 6 two successive frame periods 605 and 610 are shown to have the same SS set configuration. Similar to the frame period 505, the frame periods 605 and 610 are implemented by FFPs 105 as shown in FIGS. 1 and 2. The SS set configuration within the two frame periods 605 and 610 is the same as the SS set configuration 500 as shown in FIG. 5, and the details thereof will not be repeated.
  • the first device 310 monitors the first SS set 615 (with the configuration similar to that of the first SS set 510 as shown in FIG. 5) , labeled as SS set #1, to detect the first signal which indicates a start of a COT acquired by the second device 320.
  • the first device 310 does not detect the first signal in the first SS set 615.
  • the first device 310 does not monitor the second SS set 620 (with the configuration similar to that of the second SS set 515 as shown in FIG. 5) and the further SS set 625 (with the configuration similar to that of the further SS set 520 as shown in FIG. 5) , labeled as SS set #2 and SS set #3.
  • the first device 310 misses the first signal in the first monitoring occasion 630, but finds the first signal in the second monitoring occasion 635 in the first SS set 615. Accordingly, the first device 310 determines that the start of the COT is detected, and then the first device 310 starts monitoring the second SS set 620 and the further SS set 625 from the monitoring occasions 640 and 645 until the end of the COT within the later frame period 610. Furthermore, the first device 310 may monitor the DL slots until the end of COT in later frame period 610. The DL slots may be indicated by the second device 320, for example, through Slot Format Indication (SFI) carried in a GC-PDCCH. Moreover, the first device 310 suspends the detection of the first signal until a next frame period (not shown) to reduce complexity and power consumption.
  • SFI Slot Format Indication
  • FIG. 7 is a simplified block diagram of a device 700 that is suitable for implementing example embodiments of the present disclosure.
  • the device 700 can be implemented at or as a part of the first device 310 as shown in FIG. 3.
  • the device 700 includes a processor 710, a memory 720 coupled to the processor 710, a communication module 730 coupled to the processor 710, and a communication interface (not shown) coupled to the communication module 730.
  • the memory 720 stores at least a program 740.
  • the communication module 730 is for bidirectional communications, for example, via multiple antennas.
  • the communication interface may represent any interface that is necessary for communication.
  • the program 740 is assumed to include program instructions that, when executed by the associated processor 710, enable the device 700 to operate in accordance with the example embodiments of the present disclosure, as discussed herein with reference to FIGS. 1-6.
  • the example embodiments herein may be implemented by computer software executable by the processor 710 of the device 700, or by hardware, or by a combination of software and hardware.
  • the processor 710 may be configured to implement various example embodiments of the present disclosure.
  • the memory 720 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 720 is shown in the device 700, there may be several physically distinct memory modules in the device 700.
  • the processor 710 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 700 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the processor 710 and the communication module 730 may cooperate to implement the method 400 as described above with reference to FIGS. 1-6. All operations and features as described above with reference to FIGS. 1-6 are likewise applicable to the device 700 and have similar effects. For the purpose of simplification, the details will be omitted.
  • various example embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of example embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the method 400 as described above with reference to FIGS. 1-6.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various example embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable media.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , Digital Versatile Disc (DVD) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • DVD Digital Versatile Disc
  • an optical storage device a magnetic storage device, or any suitable combination of the foregoing.
  • a first device comprises: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the first device to: perform detection for a first signal from a second device in at least a first search space set within a frame period; determine whether the first signal is detected in the at least first search space set within the frame period; and in response to determining that the first signal is detected in the at least first search space set, perform detection for a second signal from the second device in at least a second search space set associated with the first search space set within the frame period.
  • the at least first search space set is configured for a first frame period configuration.
  • the first device is further caused to: in response to receiving an indication of change from the first frame period configuration to a different second frame period configuration, cease the detection for the first signal in the at least first search space set configured for the first frame period configuration and performing detection for the first signal in one or more search space sets configured for the second frame period configuration.
  • the first search space set is associated with a service.
  • the first device is caused to perform the detection for the first signal by: performing the detection for the first signal from the second device in the first search space set associated with the service and one or more further search space sets associated with one or more different further services within the frame period.
  • the first device is further caused to: in response to at least one of: determining that the first signal is detected in at least the first search space set associated with the service, and receiving an indication for ceasing the detection for at least the first signal in a search space set associated with a different service within the frame period, cease the detection for the first signal in the one or more further search space sets associated with the one or more different further services.
  • the at least second search space set is further associated with one or more further search space sets for the detection for the first signal within the frame period.
  • the first device is further caused to: in response to determining that the first signal is detected in the at least first search space set, cease the detection for the first signal in the at least first search space set within the frame period.
  • the first signal indicates at least that a channel is occupied by the second device within the frame period.
  • the first device is caused to perform the detection for the second signal by: performing the detection for the second signal from the second device in the second search space until an end of a channel occupancy time within the frame period.
  • the first device is further caused to: receive, from the second device, an indication of association among one or more search space sets configured for the detection of first signal and one or more search space sets configured for the detection of the second signal.
  • the first device is further caused to: receive, from the second device, an indication of at least one of: an offset of at least one of the first and second search space sets with respect to the beginning of the frame period, periodicity of at least one of the first and second search space sets within the frame period, and time duration of at least one of the first and second search space sets.
  • the frame period comprises a fixed frame period.
  • the first device comprises a terminal device
  • the second device comprises a network device
  • a method implemented at a first device comprises: performing detection for a first signal from a second device in at least a first search space set within a frame period; determining whether the first signal is detected in the at least first search space set within the frame period; and in response to determining that the first signal is detected in the at least first search space set, performing detection for a second signal from the second device in at least a second search space set associated with the first search space set within the frame period.
  • the at least first search space set is configured for a first frame period configuration.
  • the method further comprises: in response to receiving an indication of change from the first frame period configuration to a different second frame period configuration, ceasing the detection for the first signal in the at least first search space set configured for the first frame period configuration and performing detection for the first signal in one or more search space sets configured for the second frame period configuration.
  • the first search space set is associated with a service.
  • the method further comprises: performing the detection for the first signal from the second device in the first search space set associated with the service and one or more further search space sets associated with one or more different further services within the frame period.
  • the method further comprises: in response to at least one of: determining that the first signal is detected in the first search space set associated with the service, and receiving an indication for ceasing the detection for at least the first signal in a search space set associated with a different service within the frame period, ceasing the detection for the first signal in the one or more further search space sets associated with the one or more different further services.
  • the at least second search space set is further associated with one or more further search space sets for the detection for the first signal within the frame period.
  • the method further comprises: in response to determining that the first signal is detected in the at least first search space set, ceasing the detection for the first signal in the at least first search space set within the frame period.
  • the first signal indicates at least that a channel is occupied by the second device within the frame period.
  • performing the detection for the second signal comprises: performing the detection for the second signal from the second device in the second search space until an end of a channel occupancy time within the frame period.
  • the method further comprises: receiving, from the second device, an indication of association among one or more search space sets configured for the detection of first signal and one or more search space sets configured for the detection of the second signal.
  • the method further comprises: receiving, from the second device, an indication of at least one of: an offset of at least one of the first and second search space sets with respect to the beginning of the frame period, periodicity of at least one of the first and second search space sets within the frame period, and time duration of at least one of the first and second search space sets.
  • the frame period comprises a fixed frame period.
  • the first device comprises a terminal device
  • the second device comprises a network device
  • an apparatus comprises: means for performing detection for a first signal from a second device in at least a first search space set within a frame period; means for determining whether the first signal is detected in the at least first search space set within the frame period; and means for in response to determining that the first signal is detected in the at least first search space set, performing detection for a second signal from the second device in at least a second search space set associated with the first search space set within the frame period.
  • the at least first search space set is configured for a first frame period configuration.
  • the apparatus further comprises: means for in response to receiving an indication of change from the first frame period configuration to a different second frame period configuration, ceasing the detection for the first signal in the at least first search space set configured for the first frame period configuration and performing detection for the first signal in one or more search space sets configured for the second frame period configuration.
  • the first search space set is associated with a service.
  • the apparatus further comprises means for performing the detection for the first signal from the second device in the first search space set associated with the service and one or more further search space sets associated with one or more different further services within the frame period.
  • the apparatus further comprises: means for in response to at least one of: determining that the first signal is detected in the first search space set associated with the service, and receiving an indication for ceasing the detection for at least the first signal in a search space set associated with a different service within the frame period, ceasing the detection for the first signal in the one or more further search space sets associated with the one or more different further services.
  • the at least second search space set is further associated with one or more further search space sets for the detection for the first signal within the frame period.
  • the apparatus further comprises: means for in response to determining that the first signal is detected in the at least first search space set, ceasing the detection for the first signal in the at least first search space set within the frame period.
  • the first signal indicates at least that a channel is occupied by the second device within the frame period.
  • the means for performing the detection for the second signal comprises: means for performing the detection for the second signal from the second device in the second search space until an end of a channel occupancy time within the frame period.
  • the apparatus further comprises: means for receiving, from the second device, an indication of association among one or more search space sets configured for the detection of first signal and one or more search space sets configured for the detection of the second signal.
  • the apparatus further comprises: means for receiving, from the second device, an indication of at least one of: an offset of at least one of the first and second search space sets with respect to the beginning of the frame period, periodicity of at least one of the first and second search space sets within the frame period, and time duration of at least one of the first and second search space sets.
  • the frame period comprises a fixed frame period.
  • the first device comprises a terminal device
  • the second device comprises a network device
  • a computer readable storage medium comprises program instructions stored thereon, the instructions, when executed by a processor of a device, causing the device to perform the method according to some example embodiments of the present disclosure.

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

Abstract

Des modes de réalisation illustratifs selon la présente invention portent sur un dispositif, un procédé, un appareil et un support d'informations lisible par un ordinateur pour la détection de signaux phasés durant une période de trame. Selon des modes de réalisation illustratifs, un premier dispositif procède à une détection d'un premier signal émis par un deuxième dispositif dans au moins un premier ensemble d'espaces de recherche dans une période de trame. Le premier dispositif détermine si le premier signal est détecté dans le ou les premiers ensembles d'espaces de recherche dans la première période de trame. S'il est déterminé que le premier signal est détecté dans le ou les premiers ensembles d'espaces de recherche, le premier dispositif procède à une détection d'un deuxième signal émis par le deuxième dispositif dans au moins un deuxième ensemble d'espaces de recherche associés au premier ensemble d'espaces de recherche dans la période de trame.
PCT/CN2019/101179 2019-08-16 2019-08-16 Détection de signaux phasés WO2021031006A1 (fr)

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PCT/CN2019/101179 WO2021031006A1 (fr) 2019-08-16 2019-08-16 Détection de signaux phasés
CN201980099367.4A CN114223294A (zh) 2019-08-16 2019-08-16 相控信号检测

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