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WO2021109446A1 - Procédé, dispositif, et système de signalisation de radiomessagerie dans des réseaux sans fil - Google Patents

Procédé, dispositif, et système de signalisation de radiomessagerie dans des réseaux sans fil Download PDF

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Publication number
WO2021109446A1
WO2021109446A1 PCT/CN2020/088895 CN2020088895W WO2021109446A1 WO 2021109446 A1 WO2021109446 A1 WO 2021109446A1 CN 2020088895 W CN2020088895 W CN 2020088895W WO 2021109446 A1 WO2021109446 A1 WO 2021109446A1
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WIPO (PCT)
Prior art keywords
type
paging
paging dci
dci
group
Prior art date
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Ceased
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PCT/CN2020/088895
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English (en)
Inventor
Mengzhu CHEN
Xuan MA
Yuzhou HU
Jun Xu
Focai Peng
Qiang Fu
Jian KANG
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2020/088895 priority Critical patent/WO2021109446A1/fr
Priority to CN202080100623.XA priority patent/CN115552997B/zh
Publication of WO2021109446A1 publication Critical patent/WO2021109446A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This disclosure is directed generally to wireless communications, and particularly to a method, device, and system for paging signaling of various types.
  • This disclosure is directed to a method, device, and system for paging signaling of various types in wireless communications.
  • a method performed by a wireless terminal in a wireless network may include determining one or more paging occasions (POs) each for one of one or more types of paging DCI within a predetermined time duration, wherein a paging occasions of at least one of the one or more types of paging DCI is based on at least a truncated identifier of the wireless terminal and a group identifier of the wireless terminal; and monitoring physical downlink control channels (PDCCHs) at the one or more POs in the predetermined time duration.
  • the one or more types of paging DCI includes at least one of a paging DCI of a first type, a second type, or a third type
  • a wireless terminal is further disclosed.
  • the wireless terminal includes a processor and a memory, whereinthe processor is configured to read computer code from the memory to implement the method above.
  • a computer-readable medium is further disclosed.
  • the computer-readable media includes instructions or a computer program which, when executed by a wireless terminal, cause the wireless terminal to carry out the method above.
  • FIG. 1 shows a wireless communication network with an exemplary Over the Air (OTA) interface between a base station and a UE.
  • OTA Over the Air
  • FIG. 2 shows an exemplary paging cycle with paging frames.
  • FIG. 3 shows a detailed structure of a paging frame and paging occasions.
  • FIG. 4 shows an exemplary paging cycle with SSBs (Synchronization Signal/PBCH blocks) and a paging occasion for a first type of paging Downlink Control Information (DCI) .
  • SSBs Synchronization Signal/PBCH blocks
  • DCI Downlink Control Information
  • FIG. 5 shows a paging mechanism using a second type of paging DCI.
  • FIG. 6 shows a paging mechanism using a third type of paging DCI.
  • FIG. 7 shows a paging mechanism using the first and the second types of paging DCI.
  • FIG. 8 shows a paging mechanism using the second and third types of paging DCI.
  • FIG. 9 shows another paging mechanism using the second type of paging DCI.
  • FIG. 10 shows another paging mechanism using the second and third types of paging DCI.
  • FIG. 11 shows another paging mechanism using the first and second types of paging DCI.
  • FIG. 12 shows another paging mechanism using the first, second and third types of paging DCI.
  • FIG. 1 shows a wireless communication network 100 that includes a core network 110 and a radio access network (RAN) 120.
  • the RAN 120 further includes multiple base stations 122 and 124.
  • the base station 122 and user equipment (UE) 130 communicate with one another via Over the Air (OTA) radio communication resources 140.
  • the wireless communication network 100 may be implemented as, as for example, a 2G, 3G, 4G/LTE, or 5G cellular communication network.
  • the base stations 122 and 124 may be implemented as a 2G base station, a 3G nodeB, an LTE eNB, or a 5G New Radio (NR) gNB.
  • the UE 130 may be implemented as mobile or fixed communication devices installed with SIM/USIM modules for accessing the wireless communication network 100.
  • the UE 130 may include but is not limited to mobile phones, laptop computers, tablets, personal digital assistants, wearable devices, distributed remote sensor devices, roadside assistant equipment, and desktop computers.
  • the RAN 120 may be implemented as other types of radio access networks, such as Wi-Fi, Bluetooth, ZigBee, and WiMax networks.
  • the UE 130 may connect with the base station 122 via the OTA interface 140. If there is an active communication session associated with the UE 130 and the base station 122, then the status of the connection between the UE and the base station 122 is active and the UE is in an active mode. On the other hand, if there is no active communication session between the UE 130 and the base station 122, then the UE 130 moves to an RRC idle state or RRC inactive state.
  • the UE 130 limits its usage of the radio resources during the RRC idle state or RRC inactive state and may reduce power consumption by using techniques including but not limited to Discontinuous Reception (DRX) as described in more detail below.
  • DRX Discontinuous Reception
  • FIG. 2 illustrates an exemplary implementation of a DRX cycle including a plurality of radio frames.
  • radio signals are transmitted in radio frames.
  • the radio frames are identified in sequence and each radio frame is numbered with a System Frame Number (SFN) that recycles from, for example, 0 to 1023.
  • SFN System Frame Number
  • a UE may enter into a sleeping mode to reduce battery consumption.
  • the UE periodically monitors a Paging Occasion (PO) .
  • a PO is a set of PDCCH monitoring occasions and can include multiple time slots (e.g. subframe or OFDM symbol) where paging DCI can be sent.
  • One Paging Frame (PF) includes one Radio Frame and may contain one or multiple PO (s) or starting point of a PO. More detailed illustration is given in FIGs. 2 and 3.
  • the purpose of the periodical monitoring on the PO is to check if there is a paging message for the UE as well as to obtain system information update so that the UE may be able to sync up with the network.
  • the UE may go back to sleep and wake up to monitor the PO in the next cycle.
  • This cycle is referred to as a paging cycle, or a DRX cycle.
  • the length of the paging cycle is given by the number of radio frames in each cycle, denoted as T.
  • FIG. 3 illustrate an example paging frame structure 300.
  • a paging frame 310 is a special radio frame that carries paging related information.
  • the paging frame 310 may contains a number of, e.g., 10, subframes 320 indexed from 0 to 9.
  • the PO 322 corresponds to one or more PDCCH monitoring occasions and each PDCCH monitoring occasion may include one or more time slots where a paging DCI may be sent.
  • Multiple UEs may be assigned to monitor a same PO whereas each UE monitors one PO in a DRX cycle.
  • the PF and PO for a particular UE may be determined using various system and UE parameters either preconfigured or configured by higher layer signaling.
  • an SFN number for the PF may be determined by solving:
  • an index for indicating the position of the PO in the PF, as represented by i_s may be determined by, for example:
  • i_s floor (UE_ID/N) mod Ns
  • T DRX cycle of the UE.
  • T is determined by the shortest of the UE-specific DRX value (s) , if configured by RRC and/or upper layers, and a default DRX value broadcast in system information.
  • s UE-specific DRX value
  • RRC_IDLE state if a UE specific DRX is not configured by upper layers, the default value is applied.
  • ⁇ N number of total paging frames in T. N indicates the density of the paging frames in a DRX cycle.
  • ⁇ Ns number of paging occasions for a PF.
  • Ns indicates the density of the POs in a PF.
  • ⁇ PF_offset offset used for PF determination.
  • ⁇ UE_ID 5G-S-TMSI mod 1024. This is a truncated UE ID by keeping the least significant bits in an ID space between 0 to 1023.
  • each of the POs is shared by multiple UEs.
  • the UEs in the network are assigned to different pools of UEs and each UE pool is mapped to a PO, according to the exemplary formula above. For example, assuming that, in a particular system, there are 2 POs in a DRX cycle. These two POs may or may not be in the same PF. It is further assumed that there are 200 UEs being mapped to these two POs. These 200 UEs may fall into 2 pools, namely pool 1 and pool 2, with each pool including for example 100 UEs. The 100 UEs assigned in pool 1, for example, are scheduled to monitor one of the two POs.
  • each of these 100 UEs in pool 1 monitors the corresponding PO for a paging DCI for a paging message indication and determines according to such a paging message indication whether there is a paging message that needs to be further processed.
  • the paging message indication may schedule the Physical Downlink Shared Channel (PDSCH) that carries the paging message.
  • PDSCH Physical Downlink Shared Channel
  • Such indication may not be UE specific and the paging message may target one or more of the UEs.
  • the paging DCI indicates downlink scheduling of a paging message
  • each of the UEs in the pool needs to further decode the paging message according the downlink schedule even though not all of the UEs are paged, since before a successful decoding of the paging message, a UEs would not have known whether it is paged or not.
  • the paging message may only target a few UEs in this pool of UEs.
  • non-targeted UE still have to decode the paging message only to find out that the paging message is directed to other UEs.
  • This is referred to as a false alarm for the non-targeted UE in a paging message.
  • a false alarm thus causes the non-targeted UEs to waste energy to performing the decoding.
  • the paging message only targets 1 UE in the group, then the rest of the 99 unpaged UEs will still decode the paging message and this leads to a high false alarm rate.
  • the more the UEs are assigned to a PO the higher the false alarm rate would be.
  • An overall power waste may be significant in such scenarios.
  • the UE may have to first detect multiple SSBs (Synchronization Signal/PBCH block) to adjust its AGC (Automatic Gain Control) and/or time/frequency synchronization for decoding the paging DCI and paging message correctly.
  • SSBs Synchronization Signal/PBCH block
  • AGC Automatic Gain Control
  • time/frequency synchronization for decoding the paging DCI and paging message correctly.
  • this kind of decoding is referred to as a deep decoding. Deep decoding may be more power intensive. Such deep decoding caused by false alarms is very wasteful in terms of power consumption.
  • FIG. 4 illustrates the above PO detection and deep decoding process. As shown in FIG. 4, a pool of UEs monitor a PO 416 in each of the paging cycles 410.
  • the UE In order for a UE to correctly decode the paging DCI and paging message 416, the UE needs to first detect one or more SSBs 412 and 414 prior to a deep decoding to correctly decode paging DCI and paging message in 416. At the end, however, the PO may or may not carry paging information for the particular UE.
  • the paging DCI may further carry system information update related information other than or in addition to schedule information of paging message. If a UE only needs to obtain the system information update and does not need to decode the paging message, it may do so without the need to detect the multiple SSBs. This process is referred to as a light decoding, which is less power intensive than the deep decoding.
  • the various implementations below are designed to reduce the amount of false alarms induced deep decoding by a UE in RRC idle state or RRC inactive state. In the meanwhile, opportunity for the UE to keep up with the system information update can be maintained.
  • paging mechanisms based on grouping of UEs and multiple types of different paging DCIs may be implemented.
  • different types of paging DCIs may be designed.
  • UEs in the same pool may be further divided into different groups associated with corresponding group IDs.
  • Location of the POs may be determined based at least one of the UE ID, the group IDs and/or the type of paging DCI.
  • the design of the paging DCI types and the grouping of the UEs within a UE pool are implemented to reduce the false-alarm rate and/or reduce the number of deep decoding by the UEs.
  • Each of the UE groups may be configured to detect one or more types of paging DCI.
  • Grouping of the UEs reduces false alarm rate when only a group of UEs within the UE pool rather than the entire pool of UEs are associated with one PO. For example, when the UE pool of 100 UEs described above are divided into four groups of UEs having 25 UEs in each group, false alarm rate for a particular UE would be reduced by a factor of 4.
  • each UE may be associated with a group ID.
  • UEs with the same group ID are grouped to monitor one or more POs containing one or more types of paging DCIs.
  • the group ID may be determined by higher layer signaling or system information, or it may be determined by parsing the UE-ID or by parsing the unique 5G-S-TMSIs of the UEs.
  • the UE-ID represents a truncated mobile identifier in the form of, for example, 5G-S-TMSI mod 1024.
  • the various types of DCIs may be designed where each type of DCIs are associated with POs distributed in various manners across multiple DRX cycles and associated with different groups of UEs within the pool of UEs. While three different types of DCIs are shown below, other types of DCIs may be derived based on the disclosed implementations by those having ordinary skill in the art without creative efforts.
  • the first type of paging DCI targets the UEs in one or more group.
  • the first type of paging DCI may be associated with a PO in each DRX cycle.
  • the UEs across different groups may monitor the same PO associated with the first type of paging DCI every DRX cycle.
  • the UEs may only need to detect the system information update carried by the first type of paging DCI.
  • the UE may not need to decode the paging message scheduled by the first type of paging DCI.
  • the UE does not detect multiple SSBs prior to the detection of the first type of paging DCIs by performing light decoding instead of deep decoding.
  • the second type of paging DCI targets the UEs in one of the UE groups.
  • the UE may need to monitor the second type of paging DCI for the paging message and system information update.
  • the second type of DCIs are associated with a PO in each DRX cycle.
  • Each group of UEs monitors one PO every G DRX cycles, where G is a positive integer number.
  • G is the number of UE groups. For example, if 100 UEs are divided into 4 groups, and G can be set to 4.
  • Each UE of a particular group monitors the second type of paging DCI every 4 DRX cycles.
  • FIG. 5 illustrates such a paging mechanism using the second type of paging DCI.
  • the UEs may be divided into 4 groups, namely group #0 to group #3.
  • group #0 monitor the PO 510 for the second type of paging DCI.
  • the UEs in group #1 and group #2 monitor for the second type of paging DCI.
  • the group number rotates in each paging cycle.
  • the UEs in group #3 monitor the PO 512 for the second type of paging DCI.
  • UEs in group #0 monitor the PO 514 for the second type of paging DCI again.
  • each UE may only need to detect paging DCI for the scheduling of paging message every G cycle.
  • Each UE may only need to perform a deep decoding every G DRX cycles rather than every DRX cycle.
  • the paging DCI targets one or more groups of UEs.
  • the UE may need to monitor the third type of paging DCI for the paging message and/or system information update.
  • the PO associated with the third type of DCI are less frequent across multiple DRX cycles.
  • UEs in the one or more target groups may monitor the third type of paging DCI every G DRX cycles, where G is a positive integer number. In some embodiments, G is the number of UE groups. For example, if 100 UEs are divided into 4 groups, and G can be set to 4. Each UE in these 4 groups monitors the third type of DCI every 4 DRX cycles.
  • the third type of paging DCI may target 4 UE groups. As shown in FIG. 6, UEs in all the 4 groups monitor the same PO 610 targeted by the third type of paging DCI during the paging cycle 620 and then wait till the paging cycle 622 to monitor the PO 612 for the third type of paging DCI again.
  • the number of DRX cycles for a UE to monitor a certain type of paging DCI is referred to as a periodicity for this particular type of paging DCI. For example, if the UE monitors the first type of paging DCI every DRX cycle or every G1 DRX cycles, then the periodicity of the first type of paging DCI is 1 or G1 DRX cycles, respectively. If the UE monitors the second type of paging DCI every G2 DRX cycles, then the periodicity of the second type of paging DCI is G2 DRX cycles. Using FIG.
  • the second type of paging DCI targets each of the 4 groups of UEs every 4 DRX cycles, and the periodicity 530 for the second type of paging DCIs is thus 4 DRX cycles.
  • the UE monitors the third type of paging DCI every G3 DRX cycles, then the periodicity of the third type of paging DCI is G3 DRX cycles.
  • G1, G2, and G3 above are all positive integers.
  • G1, G2, or G3 may be the number of UE groups.
  • G1, G2, or G3 may be a power of 2.
  • G1, G2, and G3 may be the same.
  • M is a positive integer
  • G is the number UE groups
  • g is a zero or a positive integer representing an amount of stretch of the DCI monitoring periodicity over the number of groups.
  • the DCI for a particular UE may be associated with a PO every M DRX cycles.
  • a particular group of UEs may be configured to monitor a combination of different types of DCIs. Example combinations are given below. Example manners in which the POs corresponding to each group of UEs and for each type of paging DCIs are determined are also described below.
  • the UEs are configured with the second type of paging DCI.
  • FIG. 5 illustrates an example for the UEs to only detect the second type paging DCI.
  • a UE assigned in group #0 it monitors the PO 510 during paging cycle 520. It then monitors the PO 514 during the paging cycle 524 in the next monitoring period.
  • the number of UE group is 4, and correspondingly, the DCI monitoring periodicity is 4 DRX cycles.
  • Each group of UEs may receive paging DCI and paging message (perform deep decoding) at a corresponding DRX cycle within the monitoring period of 4 DRX cycles, and do not monitor any paging DCIs during other DRX cycles within the monitoring period.
  • the UE power consumption may be reduced.
  • the monitoring periodicity may be stretched to more than 4 cycles.
  • the monitoring periodicity may be stretched to 5 cycles.
  • one of the 5 DRX cycles in each monitoring period may correspond to no PO for any of the UEs in the four UE groups.
  • the UEs are configured with the first and the second type of paging DCI.
  • UE may detect the first type of paging DCI for system information update every DRX cycle, but does not need to further receive the scheduled PDSCH. In this case, UE does not need to detect multiple SSBs before each PO associated with the first type of paging DCI, so a light decoding is used and the power consumption is reduced.
  • UE may detect the PO associated with the second type of paging DCI every G DRX cycles for paging DCI and paging message (deep decoding) . In such a manner, UE is able to timely keep up with system information update in each DRX cycle using light decoding, while detecting paging DCI for paging message in every G DRX cycles using deep decoding.
  • FIG. 7 illustrates an example using a combination of the first type and the second type of paging DCI.
  • the UEs in group #0 monitor the second type paging DCI 712.
  • the common PO 722 represents the PO associated with the first type of DCI, and is common for more than one group of UEs, and the UEs in more than one group monitor this common PO 722.
  • the UEs in group #1 monitor the second type of paging DCI 714, and UEs in more than one group monitor the common PO 724 associated with the first type of paging DCI.
  • the UEs in group #2 monitor the second type of paging DCI 716, and UEs in more than one group monitor the common PO 726 associated with the first type of paging DCI.
  • the UEs in group #3 monitor the second type of paging DCI 718, and UEs in more than one group monitor the common PO 728 associated with the first type of paging DCI.
  • the monitoring process repeats in the next cycle 748 as shown by 720 and 730 of FIG. 7.
  • the monitoring periodicity may be stretched to more than 4 cycles.
  • the monitoring periodicity may be stretched to 5 cycles.
  • one of the 5 DRX cycles in each monitoring period may correspond to only the common PO (corresponding to the first type of paging DCI) .
  • the UEs are configured with the second and third type of paging DCI.
  • a UE may detect the second and third type of paging DCI every G DRX cycles.
  • FIG. 8 illustrates an example for this implementation.
  • the UEs in group #0 monitor the second type of paging DCI 812.
  • the common PO 822 represents the PO associated with the third type of paging DCI
  • the third type of paging DCI targets one or more UE group so the UEs in the one or more group monitor this common PO 822.
  • the UEs in group #1 monitor the second type of paging DCI 814 and there is no common PO corresponding to the third type of DCI.
  • next paging cycle 844 the UEs in group #2 monitor the second type of paging DCI 816 and there is no common PO corresponding to the third type of paging DCI.
  • the UEs in group #3 monitor the second type of paging DCI 818 and there is no common PO corresponding to the third type of paging DCI.
  • the process above iterates and the next common PO 824 associated with the third type of paging DCI is scheduled at paging cycle 848.
  • each group performs two deep decoding during the monitoring periodicity of 4 DRX cycles.
  • Group #0 UEs perform both deep decodings in the paging cycle 840.
  • Group #1 UEs perform the deep decodings in DRX cycle 840 and 842.
  • Group #2 UEs perform the deep decodings in DRX cycle 840 and 844.
  • Group #3 UEs perform the deep decodings in DRX cycle 840 and 846.
  • the monitoring periodicity may be stretched to more than 4 cycles.
  • the monitoring periodicity may be stretched to 5 cycles.
  • one of the 5 DRX cycles in a monitoring period may correspond to only a common PO corresponding to the third type of DCI.
  • the UEs are configured with the first and second type of paging DCI.
  • the UE may detect the first and second type of paging DCI every G DRX cycles, wherein G may be set to the number of the groups of the UEs with or without a stretch.
  • the first type of paging DCI may only appears every G DRX cycles.
  • the UEs are configured with the first, second, and third type of paging DCI.
  • a UE may detect the second and third type of paging DCI every G DRX cycles, where G is a positive integer number.
  • the UE may additionally detect the first type of paging DCI for system information update every DRX cycle.
  • UE detects the first type of paging DCI it may perform a light decoding without receiving the scheduled PDSCH and detect multiple SSBs before the first type of paging DCI.
  • the UEs are configured with the third type of paging DCI.
  • a UE may detect the third type of paging DCI every G DRX cycles. The power consumption may be reduced since the UE wakes up once in multiple DRX cycles.
  • FIG. 6 illustrates an example using the third type of paging DCI.
  • the UEs in one or more groups monitor the PO 610.
  • no UE in the one or more groups is scheduled to monitor any paging DCI.
  • the UEs in all the one or more groups monitor the PO 612.
  • a UE may be configured to support the various combination of the three types of the paging DCI. From one aspect, the UE may be configured to detect one or more types of paging DCI among a plurality of paging DCI types. Furthermore, the UE may determine the timing of the paging frame and the PO carrying these paging DCIs targeting the UE. The UE also needs to have frequency domain related information to locate and decode the paging DCI.
  • the UE may support all or a combination of the three paging DCIs, or even a partial feature of a certain paging DCI type.
  • the UE capabilities for supporting handling of various types of paging DCI may include but are not limited to:
  • the type of paging DCI may be associated with UE capability or UE category.
  • the UE category may include a UE with reduced capability or new radio light UE.
  • UE reports whether it supports the first or the second or the third type of paging DCI.
  • UE with reduced capability support the first or the second or the third type of paging DCI.
  • UE reports a preferred type of paging DCI via UE assistance information.
  • a preferred configuration or parameter of paging DCI can be conveyed by UE assistance information.
  • the UE can report such UE capability related parameters to the network by using mechanisms such as UE capability messages or UE assistance information messages. For example, the UE may report whether it supports the first or the second or the third type of paging DCI, or the UE may report whether it has reduced capability in supporting the second or the third type of paging DCI, or the UE may report its preferred type of paging DCI to the network. Such capability or preference information may be included in the UE capability signaling or UE assistance information.
  • the UE capability of supporting the second type or third type of paging DCI is differentiated by frequency range.
  • the UE assistance information of the second type or third type of paging DCI is differentiated by frequency range.
  • the frequency range includes frequency range 1 (FR1) and frequency range 2 (FR2) .
  • FR1 frequency range 1
  • FR2 frequency range 2
  • the definition of frequency ranges is provided in Table 1.
  • the UE capability of supporting the second type or third type of paging DCI is differentiated by Time-division Duplex (TDD) or Frequency-division Duplex (FDD) .
  • TDD Time-division Duplex
  • FDD Frequency-division Duplex
  • UE determines the PO, detect PDCCH at the PO, wherein at least one of the three types of paging DCI is conveyed by PDCCH: a first type of paging DCI, a second type of paging DCI, or a third type of paging DCI.
  • Each type of the paging DCI is associated with or determined by one or more predefined features.
  • Each type of the paging DCI is associated with or determined by one or more predefined feature.
  • These predetermined features may include but are not limited to at least one of the following:
  • ⁇ Information field (some information field may be used to carry paging DCI type and /or UE group information) .
  • the predefined feature includes the resource allocation in time domain.
  • the resource allocation in time domain includes at least one of the paging frame, paging occasion, or the first PDCCH monitoring occasion of the paging occasion.
  • at least one of the paging frame, paging occasion, or the first PDCCH monitoring occasion of the paging occasion can be different for different types of paging DCI.
  • UE may determine the time domain resource of the PF and PO. Examples for time domain specification of POs for the various types of DCIs and for different groups of UEs are described below.
  • the network and the UE For the network and the UE to determine the location of a particular PO associated with each type of the paging DCI and for a particular UE, the network as well as the UE need to be able to determine the PF and the PO location in time domain according to a common specification. The following sub-sections describe how these locations are determined in more detail.
  • the paging frame is at least associated with the UE-ID of each UE.
  • the paging may not be related to UE group ID as UEs in one or more groups monitor the first type of paging DCI.
  • an SFN number for the PF is determined by solving:
  • SFN is the System Frame Number
  • PF_offset_1 is the paging frame offset value
  • T_1 is the periodicity of the first type of paging DCI
  • N is the number of paging frames within a periodicity.
  • T_1 represents the DRX cycle.
  • UE_ID is the truncated UE identifier.
  • the paging frame of the second or third type of paging DCI is determined by an offset relative to the paging frame of the first type of paging DCI. In some embodiments, the offsets for the paging frame of the second or third type of paging DCI are different. In some embodiments, the ranges or candidates of offsets for the paging frame of the second or third type of paging DCI are different. In some embodiments, the offset is associated with at least one of subcarrier spacing or frequency range.
  • the paging frame is determined by at least one of the UE-ID, group ID or the number of groups.
  • the paging frame of the second type is at least determined by the UE-ID and group ID.
  • the paging frame of the second type is at least determined by the UE-ID, group ID and the number of groups.
  • an SFN number for the PF may be determined by solving:
  • SFN is the System Frame Number
  • PF_offset_2 is the paging frame offset value
  • T_2 is the periodicity of the second type of paging DCI
  • N is the number of paging frames within a periodicity
  • GRP_ID is the group ID
  • i is integer number
  • M is integer number
  • M is an integer number.
  • the number g in particular, represent the periodicity stretching over the group number G.
  • UE_ID is the truncated UE identifier.
  • the T_2 is (G+g) times of DRX cycle.
  • the second formula for determining the paging frame offset above for the second type of paging DCI differs from the first formula in that the PFs for paging DCI of the second type are squeezed into one or more DRX cycles rather than being spread over each DRX cycle during the monitoring period T_2, as shown by 900 in FIG. 9.
  • FIG. 9 shows a paging mechanism for the second type of paging DCI with a periodicity equal to 4 DRX cycle.
  • Example paging frames spread among all four DRX cycles for the second type of paging DCI as determined by the first formula above are squeezed into one DRX cycle 910 according to the second formula, as shown by the paging frames PF 920, PF 922, PF 924, and PF 926.
  • UEs in these 4 UE groups monitor a corresponding PO in one of the paging frames PF 920, PF 922, PF 924, and PF 926 in the same DRX cycle 910.
  • Alternative to the configuration shown in FIG. 9, by adjusting parameters in the second formula such as N and G, these 4 PFs for the four UE groups may be distributed into two or three DRX cycles.
  • the paging frame is determined by at least one of the UE-ID, group ID, or the number of groups.
  • the paging frame of the third type is at least determined by the UE-ID and number of groups.
  • the paging frame of the third type is at least determined by the UE-ID, group ID and the number of groups.
  • an SFN number for the PF may be determined by solving:
  • SFN is the System Frame Number
  • PF_offset_3 is the paging frame offset value
  • T_3 is the periodicity of the third type of paging DCI
  • N is the number of paging frames within a periodicity
  • g and j are integer numbers
  • GRP_ID_one is an integer number.
  • GRP_ID_one is configured by higher layer signaling.
  • UE_ID is the truncated UE identifier.
  • GRP_ID_one is one of the group ID.
  • T_3 is (G+g) times of the DRX cycle.
  • the various embodiments described above that includes the second type of paging DCIs would have time domain configurations different from embodiment 4 (combination of first type and second type of paging DCI) and embodiment 3 (combination of second type and third type of paging DCI) corresponding to FIGs. 6 -7, and embodiment 5 (combination of first type, second type and third type of paging DCI) .
  • the corresponding configurations with the second type of paging DCIs are shown in FIG. 10 to FIG. 12. For example, as shown in FIG.
  • UE groups 0-3 monitor PO for the third type of paging DCI at 1028, and UEs in each group additionally monitor PO for the second type of paging DCI at 1020, 1022, 1024, and 1026 during one DRX cycle 1010, respectively.
  • UEs in groups 0-3 monitor PO for the first type of paging DCI at 1128 in each DRX cycle, and UEs in each group additionally monitor PO for the second type of paging DCI at 1120, 1122, 1124, and 1126 during one DRX cycle 1110, respectively.
  • FIG. 11 As shown in FIG.
  • UEs in groups 0-3 monitor PO for the first type of paging DCI at 1230 in each DRX cycle, and UEs in each group additionally monitor PO for the second type of paging DCI at 1220, 1122, 1124, and 1126 during one DRX cycle 1210, respectively.
  • UEs in Each group further monitor PO at 1228 for the third type of paging DCI in DRX cycle 1210.
  • the paging occasion of the first or the second or the third type of paging DCI within the PF is at least associated with the UE-ID.
  • An index for indicating the position of the PO within the PF, as represented by i_s_1, is determined by:
  • i_s_1 floor (UE_ID/N) mod Ns,
  • Ns is the number of POs targeted by the first or the second or the third type of paging DCI within a PF, and N is the number of paging frames within a periodicity.
  • UE_ID is the truncated UE identifier.
  • the paging occasion of the second or third type of paging DCI is determined by an offset relative to the paging occasion of the first type of paging DCI.
  • the offsets for the paging occasion of the second or third type of paging DCI are different.
  • the ranges or candidates of offsets for the paging occasion of the second or third type of paging DCI are different.
  • the offset is associated with at least one of subcarrier spacing or frequency range.
  • an index for indicating the position of the PO within the PF for the second and third types of paging DCIs may be respectively determined by:
  • i_s_2 floor (UE_ID/N) mod Ns+offset_2, and
  • i_s_3 floor (UE_ID/N) mod Ns+offset_3
  • the paging occasion of the second type of paging DCI is at least determined by the UE-ID and/or group ID.
  • the offset value is determined by the UE-ID and/or group ID.
  • the first PDCCH monitoring occasion of a PO of the first or the second or the third type of paging DCI may be determined by the higher layer signaling.
  • the first PDCCH monitoring occasion of a PO of the second or third type of paging DCI is determined by an offset relative to the first PDCCH monitoring occasion of a PO of the first type of paging DCI.
  • the offsets for the first PDCCH monitoring occasion of a PO of the second or third type of paging DCI are different.
  • the ranges or candidates of offsets for the first PDCCH monitoring occasion of a PO of the second or third type of paging DCI are different.
  • the offset is associated with at least one of subcarrier spacing or frequency range.
  • the first PDCCH monitoring occasion of a PO of the second or the third type of paging DCI is at least determined by the UE-ID and/or group ID.
  • this disclosure discloses several different combinations for the first, second, or third type of paging DCI which are listed below:
  • the resource of third type of paging DCI can be shared with the resource of the first type of paging DCI.
  • the resource allocation in time domain of the second or the third type of paging DCI may be determined by an offset relative to resource allocation in time domain of the first type of paging DCI.
  • the offsets for the resource allocation in time domain of the second or third type of paging DCI are different.
  • the ranges or candidates of offsets for resource allocation in time domain of the second or third type of paging DCI are different.
  • the offset is associated with at least one of subcarrier spacing or frequency range.
  • the second type of paging DCI with different group ID is multiplexed in time domain (TDM) .
  • the first type of paging DCI and the second type of paging DCI are multiplexed in time domain (TDM) .
  • the second type of paging DCI and the third type of paging DCI are multiplexed in time domain (TDM) .
  • the first type of paging DCI and the third type of paging DCI are multiplexed in time domain (TDM) .
  • each type of paging DCIs is associated with at least one of the periodicity, paging frame, paging occasion, or the first PDCCH monitoring occasion of a PO.
  • the periodicity implementations for different types of paging DCI and the determination of the paging frame and PO within a paging frame has been described in detail above.
  • the determination of the first PDCCH monitoring occasion of a PO has also been described in detail above.
  • the time domain resource allocation for various types of paging DCIs may depend on the group ID of the UEs.
  • group ID may depend on the various options of implementation of group ID.
  • this disclosure discloses several different combinations for the first, second, or third type of paging DCI which are listed below:
  • the resource of the third type of paging DCI can be shared with the resource of the first type of paging DCI.
  • the resource allocation in frequency domain of the first type of paging DCI may be determined by higher layer signaling.
  • the resource allocation in frequency domain of the second or the third type of paging DCI may be determined by an offset relative to resource allocation in frequency domain of the first type of paging DCI.
  • the offsets for the resource allocation in frequency domain of the second or third type of paging DCI are different.
  • the ranges or candidates of offsets for resource allocation in frequency domain of the second or third type of paging DCI are different.
  • the offset is associated with at least one of subcarrier spacing or frequency range.
  • the first type of paging DCI and the second type of paging DCI are multiplexed in frequency domain (FDM) .
  • the second type of paging DCI and the third type of paging DCI are multiplexed in frequency domain (FDM) .
  • the first type of paging DCI and the third type of paging DCI are multiplexed in frequency domain (FDM) .
  • the types of paging DCI are determined by or associated with the resource allocation in time domain and frequency domain.
  • the paging DCIs of the various types above carries various information fields.
  • the first type of paging DCI includes the following information field:
  • the second type of paging DCI schedules paging messages for a group of UEs.
  • the second type of paging DCI includes the following information field:
  • the third type of paging DCI is a common paging DCI shared by multiple groups of UEs.
  • the third type of paging DCI schedules paging messages for more than one group of UEs.
  • the third type of paging DCI includes the following information field:
  • the third type of paging DCI includes the first type of paging DCI or the first type of paging DCI includes the third type of paging DCI.
  • the first or the second or the third type of paging DCI includes an information field that indicates an update of a reference signal configuration, wherein the reference signal includes at least one of the channel state information reference signal (CSI-RS) or Tracking reference signal (TRS) .
  • the TRS can be CSI-RS for tracking.
  • the types of the paging DCI are associated with or determined by the interpretations or values or code points of a plurality of information fields.
  • the plurality of information fields includes at least one of the short messages, or predefined information fields.
  • the paging DCI carries information indicating its type among the three types of paging DCI.
  • a paging DCI targeting a particular UE group or groups carries group ID information of the UE group (s) .
  • Such information may be carried by various information fields of the paging DCI as described above in manners detailed below.
  • the paging DCI type indicator may be carried in the short messages.
  • the type of paging DCI is determined by a plurality of bits in the short messages. For example, the plurality bits include at least one of the 3rd ⁇ 8th bit of the short messages.
  • the plurality of bits when the plurality of bits is set to value V1, it indicates the first type of paging DCI. In some implementations, V1 may be all zeros or all ones. For another example, when the plurality of bits is set to value V2, it indicates the second type of paging DCI. For another example, when the plurality of bits is set to value V2, it indicates the second type of paging DCI. In some implementations, for the second type of paging DCI, a group ID is conveyed. A bitmap may be used to indicate whether certain groups or subgroups are paged or not. For another example, when the plurality of bits is set to value V3, it indicates the third type of paging DCI. In some implementations, a group ID is conveyed by the third type of paging DCI. A bitmap may be used to indicate whether certain groups are paged or not.
  • the paging DCI type indicator may be carried in a code point of the short messages.
  • the code point of the short messages when the code point of the short messages is set to value C1, it indicates the first type of paging DCI.
  • C1 may be all zeros or all ones.
  • the code point of the short messages when the code point of the short messages is set to value C2, it indicates the second type of paging DCI.
  • a group ID or a sub-group ID is indicated by the second type of paging DCI.
  • the indication may be a bitmap.
  • the code point of the short messages when the code point of the short messages is set to value C3, it indicates the third type of paging DCI.
  • a group ID is indicated by the third type of paging DCI.
  • the indication may be a bitmap.
  • the interpretation of a plurality of bits of the short messages is associated with the type of paging DCI.
  • the plurality of bits may be reserved bits for the first type of paging DCI.
  • the plurality of bits are used as a bitmap to indicate whether the groups or subgroups are paged or not for the second type of paging DCI.
  • the plurality of bits are used to indicate whether the groups are paged or not for the third type of paging DCI.
  • the indication may further be a bitmap.
  • the DCI further carries a predefined information field.
  • the predefined information field includes the information field after TB scaling information field.
  • the predefined information field may include the reserved bits or additional information bits.
  • the predefined information is reserved bits in the first type of paging DCI.
  • the predefined information filed is additional information bits in the second or third type of paging DCI.
  • R1 may be all zeros or all ones.
  • when the predefined information field is set to R2, it indicates the second type of paging DCI.
  • the group ID or subgroup ID is conveyed by the second type of paging DCI.
  • the plurality of bits in the predefined information field are used as a bitmap to indicate whether the groups or subgroups are paged or not for the second type of paging DCI.
  • the predefined information field is set to R3, it indicates the third type of paging DCI.
  • the group ID is conveyed by the third type of paging DCI.
  • the indicator may further be a bitmap.
  • the interpretation of a plurality of bits of the predefined information field is associated with the type of paging DCI.
  • the plurality of bits are reserved bits for the first type of paging DCI.
  • the plurality of bits are used to indicate whether the groups or subgroups are paged or not for the second type of paging DCI.
  • the indicator may further be a bitmap.
  • the plurality of bits are used to indicate whether the groups are paged or not for the third type of paging DCI.
  • the indicator may further be a bitmap.
  • the types of paging DCI are determined by or associated with the resource allocation in time domain and the interpretations or values of the information fields. In some embodiments, the types of paging DCI are determined by or associated with the resource allocation in frequency domain and the interpretations or values of the information fields. In some embodiments, the types of paging DCI are determined by or associated with the resource allocation in time and frequency domain and the interpretations or values of the information fields.
  • the Cyclic Redundancy Check (CRC) bits of first type of paging DCI are scrambled by P-RNTI (Paging -Radio Network Temporary Identifier) .
  • P-RNTI Paging -Radio Network Temporary Identifier
  • the CRC bits of second or third type of paging DCI are scrambled by RNTI other than P-RNTI.
  • the value of RNTI used to scramble CRC bits of the first type of paging DCI is FFFE (hexadecimal number) .
  • the value of RNTI used to scramble CRC bits of the second or third type of paging DCI is a value other than FFFE (hexadecimal number) . For example, it may be in the range of FFF0–FFFD (hexadecimal number) .
  • the types of paging DCI are determined by or associated with the resource allocation in time/frequency domain and the RNTI used to scramble the CRC bits of the paging DCI. In some embodiments, the types of paging DCI are determined by or associated with the interpretations/values of the information fields and the RNTI used to scramble the CRC bits of the paging DCI.
  • the type of the paging DCI is determined by or associated with a higher layer signaling or system information.
  • the types of paging DCI are determined by or associated with the resource allocation in time/frequency domain and the higher layer signaling. In some embodiments, the types of paging DCI are determined by or associated with the RNTI and the higher layer signaling.
  • the type of the paging DCI is associated with SCS (Subcarrier spacing) . In an example implementation, the type of paging DCI depends on the subcarrier spacing.
  • the type of paging DCI is associated with search space set or search space set ID.
  • at least one of the first or second or third paging DCI has a dedicated search space set or search space set ID.
  • the second type of paging DCI with different group ID is distinguished by search space set or search space set ID.
  • the type of paging DCI is associated with CORESET (Control Resource Set) or CORESET ID.
  • CORESET Control Resource Set
  • the first or second or third paging DCI has a dedicated CORESET or CORESET ID.
  • the second type of paging DCI with different group ID is distinguished by CORESET or CORESET ID.
  • the types of paging DCI may be associated with the DCI formats.
  • the first type of paging DCI may be DCI format 0-1.
  • the second or third type of paging DCI may be DCI format other than DCI format 0-1.
  • the types of paging DCI are determined by or associated with the resource allocation in time/frequency domain and DCI format.
  • the types of paging DCI are determined by or associated with the RNTI and DCI format.
  • the types of paging DCI are determined by or associated with the RNTI and search space set.
  • the types of paging DCI are determined by or associated with the RNTI and CORESET.
  • the type of paging DCI is associated with the offset relative to the reference signal.
  • the offsets of the first or second or third type of paging DCI are different.
  • the ranges or candidates of offsets of the first or second or third type of paging DCI are different.
  • the offset is associated with at least one of subcarrier spacing or frequency range.
  • the type of paging DCI is associated with the periodicity relative to the reference signal.
  • the periodicity of the first type of paging DCI may be a multiple of periodicity of the reference signal such as N1 times.
  • the periodicity of the second type of paging DCI may be a multiple of periodicity of the reference signal, such as N2 times.
  • the periodicity of the third type of paging DCI may be a multiple of periodicity of the reference signal, such as N3 times. Wherein N1, N2, and N3 are positive integer numbers.
  • the reference signal is at least one of the SSB, CSI-RS (channel state information reference signal) , TRS (tracking reference signal) .
  • a UE is configured to support at least the second type of paging DCI.
  • the UE is configured to detect the second type of paging DCI every 4 paging cycles (paging cycle is also referred to as DRX cycle) .
  • the periodicity of the second type of paging DCI in this particular implementation is 4 DRX cycles which is shown as periodicity 530.
  • the UE wakes up and detects the PO and further decodes the paging DCI from the PDCCH channel of the PO. Based on the information carried in the DCI, the UE may take further action such as locate and decode the paging message from the PDSCH channel.
  • the second type of paging DCI schedules paging messages for a group of UE. For example, the paging message for group #0 UEs is scheduled at the paging cycle 520, whereas the paging message for group #3 UEs is scheduled at paging cycle 522.
  • the second type of paging DCI includes the following information field:
  • the type of paging DCI is determined by a plurality of bits of the short message.
  • the plurality bits include at least one of the 3rd ⁇ 8th bit of the short message.
  • the type of paging DCI is determined by a code point of the short message.
  • the type of paging DCI is determined by a predefined information field. In some scenarios, the second type of paging DCI conveys the group ID that is paged.
  • the second type of paging DCI with different group ID is multiplexed in time domain (TDM)
  • UE detects the second type of paging DCI every G2 DRX cycle, or the periodicity of the paging occasion of the second paging DCI is G2 DRX cycles.
  • G2 may be the number of groups. For example, as shown in FIG. 5, there are four paging groups and the periodicity is 4 DRX cycles. In some scenarios, G2 may be a power of 2.
  • the paging frame of the second type of paging DCI is at least determined by UE-ID, group ID, and number of groups.
  • a SFN number for the paging frame as represented by PF_offset_2 is determined by solving:
  • SFN is the system frame number
  • PF_offset_2 is the offset value
  • T_2 is the periodicity of the second type of paging DCI
  • N is the number of paging frames within a periodicity
  • G is the number of groups
  • GRP_ID is the group ID.
  • the group ID is determined by higher layer signaling or system information. In some scenarios, the group ID is determined by UE-ID or 5G-S-TMSI.
  • T_2 is G times of the DRX cycle.
  • An index for indicating the position of the PO within the PF, as represented by (i_s_2) , is determined by:
  • i_s_2 floor (UE_ID/N) mod Ns+offset_2,
  • Ns is the number of PO of the first type of paging DCI within a PF
  • offset_2 is the offset value
  • offset_2 is an integer number
  • the resource of the second type of DCI is shared with the resource of the first type of DCI.
  • the resource allocation of the second type of DCI is multiplexed with the resource allocation of the first type of DCI in frequency domain (FDM) or time domain (FDM) .
  • the second or third type of paging DCI is scrambled by RNTI other than P-RNTI.
  • the value of RNTI used to scramble the second type of paging DCI is other than FFFE (hexadecimal number) .
  • the value is in the range of FFF0–FFFD (hexadecimal number) .
  • the UE reports whether it supports the second type of paging DCI or not.
  • UE is configured with reduced capability to support the second type of paging DCI.
  • a preferred configuration or parameter of the second type of paging DCI may be conveyed by UE assistance information.
  • the disclosure above describes a method and system for UEs to monitor paging DCIs.
  • the paging DCIs includes several different types.
  • the UEs are divided into multiple groups. Each group of UEs may monitor paging DCIs of any combination of the several types.
  • the type of the paging DCI is determined by a predefined feature.
  • the paging frames and paging occasions associated with each type of paging DCIs for a particular UE may be determined based on a UE identifier.
  • the schemes described in this disclosure help reduce false alarm rates in paging monitoring, thereby decreasing power consumption of UEs, especially UEs in RRC idle state or RRC inactive state.
  • the various implementations below are designed to reduce the amount of false alarm induced deep decoding by a UE in idle state while maintain ample opportunity for the UE to keep up with the system update information.
  • terms, such as “a, ” “an, ” or “the, ” may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context.
  • the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for the existence of additional factors not necessarily expressly described, again, depending at least in part on context.

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Abstract

La présente divulgation décrit un procédé et un système pour que les UE surveillent des DCI de radiomessagerie. Les DCI de radiomessagerie comprennent plusieurs types différents. Les UE sont divisées en plusieurs groupes. Chaque groupe d'UE peut surveiller les DCI de radiomessagerie d'une quelconque combinaison des plusieurs types. Le type de DCI de radiomessagerie est déterminé par une caractéristique prédéfinie. Les trames de radiomessagerie et les occasions de radiomessagerie associées à chaque type de DCI de radiomessagerie pour un UE particulier peuvent être déterminées sur la base d'un identifiant d'UE. Les schémas décrits dans la présente divulgation aident à réduire les taux de fausses alarmes dans la surveillance de radiomessagerie, ce qui permet de réduire la consommation d'énergie d'UE, en particulier des UE dans un état inerte RRC ou un état inactif RRC.
PCT/CN2020/088895 2020-05-07 2020-05-07 Procédé, dispositif, et système de signalisation de radiomessagerie dans des réseaux sans fil Ceased WO2021109446A1 (fr)

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