KR20230066840A - Method and Apparatus for distribution unit to paging in mobile wireless communication system - Google Patents

Abstract

According to an embodiment of the present invention, a method of a dispersion unit comprises the following steps of: receiving a plurality of first paging messages from a centralization unit; and transmitting a second paging message including information of the plurality of first paging messages through a paging channel at a determined paging opportunity.

Description

Method and apparatus for processing a paging message by a distribution unit in a wireless mobile communication system

The present disclosure relates to a method and apparatus for processing a paging message by a distribution unit in a wireless communication system.

In order to meet the growing demand for wireless data traffic after the commercialization of 4G communication systems, 5G communication systems have been developed. In order to achieve a high data rate, the 5G communication system has introduced a very high frequency (mmWave) band (eg, such as the 60 GHz band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems. ), array antenna, analog beam-forming and large scale antenna technologies are used. In the 5G communication system, scalability is increased by dividing the base station into a central unit and a distribution unit. In addition, the 5G communication system aims to support very high data rates and very low transmission delays in order to support various services.

Disclosed embodiments are intended to provide a method and apparatus for processing a paging message by a distribution unit in a wireless communication system.

According to an embodiment of the present disclosure, in a method of a distribution unit, including the steps of receiving a plurality of first paging messages from a concentration unit and information of the plurality of first paging messages through a paging channel at a determined paging opportunity. and sending a second paging message.

The disclosed embodiment provides a method and apparatus for processing a paging message by a distribution unit in a wireless communication system.

1A is a diagram illustrating the structure of a 5G system and an NG-RAN according to an embodiment of the present disclosure.
1B is a diagram illustrating a radio protocol structure in a NR system according to an embodiment of the present disclosure.
1c is a diagram illustrating transitions between RRC states according to an embodiment of the present disclosure.
1D is a diagram illustrating the structure of a GNB according to an embodiment of the present disclosure.
2A is a diagram illustrating operations of a terminal and a base station according to an embodiment of the present disclosure.
3A is a flowchart illustrating an operation of a distribution unit according to an embodiment of the present disclosure.
4A is a block diagram showing the internal structure of a terminal to which the present invention is applied.
4B is a block diagram showing the internal structure of a dispersing unit to which the present invention is applied.

Hereinafter, embodiments of the present invention will be described in detail with accompanying drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

A term used in the following description to identify a connection node, a term referring to network entities, a term referring to messages, a term referring to an interface between network entities, and a term referring to various types of identification information. Etc. are illustrated for convenience of description. Therefore, the present invention is not limited to the terms described below, and other terms indicating objects having equivalent technical meanings may be used.

For convenience of description below, the present invention uses terms and names defined in the 3rd Generation Partnership Project (3GPP) standard, which is the most up-to-date among existing communication standards. However, the present invention is not limited by the above terms and names, and may be equally applied to systems conforming to other standards.

Table 1 lists the abbreviations used in the present invention.

Acronym full name Acronym full name 5GC 5G Core Network RACH Random Access Channel ACK Acknowledgment RAN Radio Access Network AM Acknowledged Mode RA-RNTI Random Access RNTI AMF Access and Mobility Management Function RAT Radio Access Technology ARQ Automatic Repeat Request RB Radio Bearer AS Access Stratum RLC Radio Link Control ASN.1 Abstract Syntax Notation One RNA RAN-based Notification Area BSR Buffer Status Report RNAU RAN-based Notification Area Update BWP Bandwidth Part RNTI Radio Network Temporary Identifier CA Carrier Aggregation RRC Radio Resource Control CAG Closed Access Group RRM Radio Resource Management CG Cell Group RSRP Reference Signal Received Power C-RNTI Cell RNTI RSRQ Reference Signal Received Quality CSI Channel State Information RSSI Received Signal Strength Indicator DCI Downlink Control Information SCell Secondary Cell DRB (user) Data Radio Bearer SCS Subcarrier Spacing DRX Discontinuous Reception SDAP Service Data Adaptation Protocol HARQ Hybrid Automatic Repeat Request SDU Service Data Unit IE Information element SFN System Frame Number LCG Logical Channel Group S-GW Serving Gateway MAC Medium Access Control SI System Information MIB Master Information Block SIB System Information Block NAS Non-Access Stratum SpCell Special Cell NG-RAN NG Radio Access Network SRB Signaling Radio Bearer NR NR Radio Access SRS Sounding Reference Signal PBR Prioritized Bit Rate SSB SS/PBCH block PCell Primary Cell SSS Secondary Synchronization Signal PCI Physical Cell Identifier SUL Supplementary Uplinks PDCCH Physical Downlink Control Channel TM Transparent Mode PDCP Packet Data Convergence Protocol UCI Uplink Control Information PDSCH Physical Downlink Shared Channel UE User Equipment PDUs Protocol Data Unit UM Unacknowledged Mode PHR Power Headroom Report PLMN Public Land Mobile Network PRACH Physical Random Access Channel PRB Physical Resource Block PSS Primary Synchronization Signal PUCCH Physical Uplink Control Channel PUSCH Physical Uplink Shared Channel

Table 2 defines terms frequently used in the present invention.

Terminology Definition allowedCG-List List of configured grants for the corresponding logical channel. This restriction applies only when the UL grant is a configured grant. If present, UL MAC SDUs from this logical channel can only be mapped to the indicated configured grant configuration. If the size of the sequence is zero, then UL MAC SDUs from this logical channel cannot be mapped to any configured grant configurations. If the field is not present, UL MAC SDUs from this logical channel can be mapped to any configured grant configurations. allowedSCS-List List of allowed sub-carrier spacings for the corresponding logical channel. If present, UL MAC SDUs from this logical channel can only be mapped to the indicated numerology. Otherwise, UL MAC SDUs from this logical channel can be mapped to any configured numerology. allowedServingCells List of allowed serving cells for the corresponding logical channel. If present, UL MAC SDUs from this logical channel can only be mapped to the serving cells indicated in this list. Otherwise, UL MAC SDUs from this logical channel can be mapped to any configured serving cell of this cell group. Carrier frequency center frequency of the cell. Cell combination of downlink and optionally uplink resources. The linking between the carrier frequency of the downlink resources and the carrier frequency of the uplink resources is indicated in the system information transmitted on the downlink resources. Cell Group in dual connectivity, a group of serving cells associated with either the MeNB or the SeNB. Cell reselection A process to find a better suitable cell than the current serving cell based on the system information received in the current serving cell Cell selection A process to find a suitable cell either blindly or based on the stored information Dedicated signaling Signaling sent on DCCH logical channel between the network and a single UE. discardTimer Timer to control the discard of a PDCP SDU. Starting when the SDU arrives. Upon expiry, the SDU is discarded. F The Format field in MAC subheader indicates the size of the Length field. Field The individual contents of an information element are referred to as fields. Frequency layer set of cells with the same carrier frequency. Global cell identity An identity to uniquely identify an NR cell. It is consisted of cellIdentity and plmn-Identity of the first PLMN-Identity in plmn-IdentityList in SIB1. gNB node providing NR user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC. Handover procedure that changes the serving cell of a UE in RRC_CONNECTED. Information element A structural element containing single or multiple fields is referred as information element. L The Length field in MAC subheader indicates the length of the corresponding MAC SDU or of the corresponding MAC CE LCID 6 bit logical channel identity in MAC subheader to denote which logical channel traffic or which MAC CE is included in the MAC subPDU MAC-I Message Authentication Code - Integrity. 16 bit or 32 bit bit string calculated by NR Integrity Algorithm based on the security key and various fresh inputs Logical channel a logical path between a RLC entity and a MAC entity. There are multiple logical channel types depending on what type of information is transferred e.g. CCCH (Common Control Channel), DCCH (Dedicate Control Channel), DTCH (Dedicate Traffic Channel), PCCH (Paging Control Channel) LogicalChannelConfig The IE LogicalChannelConfig is used to configure the logical channel parameters. It includes priority, prioritisedBitRate, allowedServingCells, allowedSCS-List, maxPUSCH-Duration, logicalChannelGroup, allowedCG-List etc logicalChannelGroup ID of the logical channel group, as specified in TS 38.321, which the logical channel belongs to MAC CE Control Element generated by a MAC entity. Multiple types of MAC CEs are defined, each of which is indicated by corresponding LCID. A MAC CE and a corresponding MAC sub-header comprises a MAC subPDU Master Cell Group in MR-DC, a group of serving cells associated with the Master Node, comprising of the SpCell (PCell) and optionally one or more SCells. maxPUSCH-Duration Restriction on PUSCH-duration for the corresponding logical channel. If present, UL MAC SDUs from this logical channel can only be transmitted using uplink grants that result in a PUSCH duration shorter than or equal to the duration indicated by this field. Otherwise, UL MAC SDUs from this logical channel can be transmitted using an uplink grant resulting in any PUSCH duration. NR NR radio access PCell SpCell of a master cell group. PDCP entity reestablishment The process triggered upon upper layer request. It includes the initialization of state variables, reset of header compression and manipulating of stored PDCP SDUs and PDCP PDUs. The details can be found in 5.1.2 of 38.323 PDCP suspend The process triggered upon upper layer request. When triggered, transmitting PDCP entity set TX_NEXT to the initial value and discard all stored PDCP PDUs. The receiving entity stop and reset t-Reordering, deliver all stored PDCP SDUs to the upper layer and set RX_NEXT and RX_DELIV to the initial value PDCP-config The IE PDCP-Config is used to set the configurable PDCP parameters for signaling and data radio bearers. For a data radio bearer, discardTimer, pdcp-SN-Size, header compression parameters, t-Reordering and whether integrity protection is enabled are configured. For a signaling radio bearer, t-Reordering can be configured PLMN ID Check the process that checks whether a PLMN ID is the RPLMN identity or an EPLMN identity of the UE. Primary Cell The MCG cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure. Primary SCG Cell For dual connectivity operation, the SCG cell in which the UE performs random access when performing the Reconfiguration with Sync procedure. priority Logical channel priority, as specified in TS 38.321. an integer between 0 and 7. 0 means the highest priority and 7 means the lowest priority PUCCH SCell a Secondary Cell configured with PUCCH. Radio Bearer Logical path between a PDCP entity and upper layer (i.e. SDAP entity or RRC) RLC bearer RLC and MAC logical channel configuration of a radio bearer in one cell group. RLC bearer configuration The lower layer part of the radio bearer configuration comprising the RLC and logical channel configurations. RX_DELIV This state variable indicates the COUNT value of the first PDCP SDU not delivered to the upper layers, but still waited for. RX_NEXT This state variable indicates the COUNT value of the next PDCP SDU expected to be received. RX_REORD This state variable indicates the COUNT value following the COUNT value associated with the PDCP Data PDU which triggered t-Reordering. Serving Cell For a UE in RRC_CONNECTED not configured with CA/DC there is only one serving cell comprising of the primary cell. For a UE in RRC_CONNECTED configured with CA/ DC the term 'serving cells' is used to denote the set of cells comprising of the Special Cell(s) and all secondary cells. SpCell primary cell of a master or secondary cell group. Special Cell For Dual Connectivity operation the term Special Cell refers to the PCell of the MCG or the PSCell of the SCG, otherwise the term Special Cell refers to the PCell. SRB Signaling Radio Bearers" (SRBs) are defined as Radio Bearers (RBs) that are used only for the transmission of RRC and NAS messages. SRB0 SRB0 is for RRC messages using the CCCH logical channel SRB1 SRB1 is for RRC messages (which may include a piggybacked NAS message) as well as for NAS messages prior to the establishment of SRB2, all using DCCH logical channel; SRB2 SRB2 is for NAS messages and for RRC messages which include logged measurement information, all using DCCH logical channel. SRB2 has a lower priority than SRB1 and may be configured by the network after AS security activation; SRB3 SRB3 is for specific RRC messages when UE is in (NG)EN-DC or NR-DC, all using DCCH logical channel SRB4 SRB4 is for RRC messages which include application layer measurement reporting information, all using DCCH logical channel. Suitable cell A cell on which a UE may camp. Following criteria apply
- The cell is part of either the selected PLMN or the registered PLMN or PLMN of the Equivalent PLMN list
- The cell is not barred
- The cell is part of at least one TA that is not part of the list of "Forbidden Tracking Areas for Roaming" (TS 22.011 [18]), which belongs to a PLMN that fulfills the first bullet above.
- The cell selection criterion S is fulfilled (ie RSRP and RSRQ are better than specific values t-Reordering Timer to control the reordering operation of received PDCP packets. Upon expiry, PDCP packets are processed and delivered to the upper layers. TX_NEXT This state variable indicates the COUNT value of the next PDCP SDU to be transmitted. UE Inactive AS Context UE Inactive AS Context is stored when the connection is suspended and restored when the connection is resumed. It includes information below.
the current KgNB and KRRCint keys, the ROHC state, the stored QoS flow to DRB mapping rules, the C-RNTI used in the source PCell, the cellIdentity and the physical cell identity of the source PCell, the spCellConfigCommon within ReconfigurationWithSync of the NR PSCell (if configured) and all other parameters configured except for:
- parameters within ReconfigurationWithSync of the PCell;
- parameters within ReconfigurationWithSync of the NR PSCell, if configured;
- parameters within MobilityControlInfoSCG of the E-UTRA PSCell, if configured;
-servingCellConfigCommonSIB;

In the present invention, “trigger” or “triggered” and “initiate” or “initiate” may be used in the same meaning.

In the present invention, terminal and UE may be used in the same meaning. In the present invention, a base station and an NG-RAN node may be used in the same meaning.

1A is a diagram illustrating structures of a 5G system and an NG-RAN according to an embodiment of the present disclosure.

The 5G system consists of NG-RAN (1a-01) and 5GC (1a-02). An NG-RAN node is one of the two below.

1: gNB providing NR user plane and control plane towards UE; or

2: ng-eNB providing E-UTRA user plane and control plane to UE side.

gNBs (1a-05 to 1a-06) and ng-eNBs (1a-03 to 1a-04) are interconnected through an Xn interface. The gNB and ng-eNB are connected to an Access and Mobility Management Function (AMF) (1a-07) and a User Plane Function (UPF) (1a-08) through an NG interface. AMF (1a-07) and UPF (1a-08) can be composed of one physical node or separate physical nodes.

gNBs (1a-05 to 1a-06) and ng-eNBs (1a-03 to 1a-04) host the functions listed below.

Radio bearer control, radio admission control, connection mobility control, dynamic allocation of resources to UEs on the uplink, downlink and sidelink (schedule), IP and Ethernet header compression, uplink data decompression and encryption of user data streams, AMF selection, routing of user plane data to UPF, scheduling and transmission of paging messages, scheduling and transmission of broadcast information (originating from AMF or O&M), when AMF selection is not possible with the information provided;

Measurement and measurement report configuration for mobility and scheduling, session management, QoS flow management and mapping to data radio bearers, RRC_INACTIVE support, radio access network sharing;

Close interaction between NR and E-UTRA, support for network slicing.

AMF (1a-07) hosts functions such as NAS signaling, NAS signaling security, AS security control, S-GW selection, authentication, mobility management and location management.

UPF 1a-08 hosts functions such as packet routing and forwarding, transport-level packet marking on the uplink and downlink, QoS management, and mobility anchoring for mobility.

Figure 1b- is a diagram showing the radio protocol structure of a 5G system.

The user plane protocol stack is SDAP (1b-01 to 1b-02), PDCP (1b-03 to 1b-04), RLC (1b-05 to 1b-06), MAC (1b-07 to 1b-08), PHY (1b-09 to 1b-10). The control clearing protocol stack consists of NAS (1b-11 to 1b-12), RRC (1b-13 to 1b-14), PDCP, RLC, MAC, and PHY.

Each protocol sublayer performs functions related to the operations listed in Table 3.

Sublayer Functions NAS Authentication, mobility management, security control, etc. RRC System information, paging, RRC connection management, security functions, signaling radio bearer and data radio bearer management, mobility management, QoS management, recovery from radio link failure detection and recovery, NAS message transmission, etc. SDAP Mapping between QoS flows and data radio bearers, QoS flow ID (QFI) marking of DL and UL packets. PDCP Data transmission, header compression and decompression, encryption and decryption, integrity protection and integrity verification, redundant transmission, ordering and out-of-order delivery, etc. RLC Higher layer PDU transmission, error correction through ARQ, RLC SDU division and re-division, SDU reassembly, RLC re-establishment, etc. MAC Mapping between logical channels and transport channels, multiplexing/demultiplexing MAC SDUs belonging to one or another logical channel in a transport block (TB) carried in the physical layer, information reporting schedule, priority processing between UEs, priority between single UE logical channels ranking processing, etc. PHY Channel coding, physical layer hybrid-ARQ processing, rate matching, scrambling, modulation, layer mapping, downlink control information, uplink control information, etc.

The UE supports three RRC states. Table 4 lists the characteristics of each condition.

RRC state Characteristic RRC_IDLE PLMN selection; Broadcast of system information;
Cell re-selection mobility;
Paging for mobile terminated data is initiated by 5GC;
DRX for CN paging configured by NAS. RRC_INACTIVE PLMN selection; Broadcast of system information; Cell re-selection mobility;
Paging is initiated by NG-RAN (RAN paging);
RAN-based notification area (RNA) is managed by NG-RAN;
DRX for RAN paging configured by NG-RAN;
5GC - NG-RAN connection (both C/U-planes) is established for UE;
The UE AS context is stored in NG-RAN and the UE;
NG-RAN knows the RNA which the UE belongs to. RRC_CONNECTED 5GC - NG-RAN connection (both C/U-planes) is established for UE; The UE AS context is stored in NG-RAN and the UE; NG-RAN knows the cell which the UE belongs to;
Transfer of unicast data to/from the UE;
Network controlled mobility including measurements.

Figure 1c is a diagram illustrating RRC state transitions. State transition occurs between RRC_CONNECTED (1c-11) and RRC_INACTIVE (1c-13) by exchanging a resume message and a Release message containing SuspendConfig IE.

State transition occurs between RRC_ CONNECTED (1c-11) and RRC_IDLE (1c-15) through RRC connection establishment and RRC connection release.

State transition occurs from RRC_INACTIVE (1c-13) to RRC_IDLE (1c-15) through RRC connection release.

SuspendConfig IE includes the following information.

<SuspendConfig>

1: 1st UE identifier: UE identifier that can be included in RRCResumeRequest when state transition is made to RRC_CONNECTED. It is 40 bits long.

2: Second terminal identifier: an identifier of a terminal that may be included in RRCResumeRequest when a state transition is made to RRC_CONNECTED. The length is 24 bits.

1d-: ran-Paging Cycle: Paging cycle to be applied in RRC_INACTIVE state.

4: ran-Notification AreaInfo: setting information of ran-Notification Area set to cell list, etc. The UE starts a resume procedure when the ran_Notification Area is changed.

5: t1d-80: Timer associated with periodic resume procedure.

6: NextHopChangingCount (NCC): A counter used to derive a new secret key after performing the resume procedure.

1D is a diagram illustrating the structure of a GNB according to an embodiment of the disclosure.

A gNB (1d-11 to 1d-12) may consist of one gNB-CU (1d-13) and one or more gNB-DUs (1d-14 to 1d-15). The gNB-CU and gNB-DU are connected through the F1 interface. One gNB-DU is connected only to one gNB-CU. The gNB-CU provides RRC, SDAP, and PDCP protocol sublayers, and the gNB-DU provides RLC, MAC, and PHY protocol sublayers.

Existing paging messages contain only the UE ID of the paging UE. If the UE is doing something potentially more important than responding to the paging message, the UE may decide to continue with the current task instead of responding to the paging. It may be useful to include additional information such as paging cause in the paging message so that the terminal can make this decision.

Figure 2a illustrates the operation of the UE and GNB for paging.

The UE may use Discontinuous Reception (DRX) in the RRC_IDLE and RRC_INACTIVE states to reduce power consumption. The UE monitors one paging opportunity (PO, Paging Occasion) per DRX cycle. A PO is a set of PDCCH monitoring opportunities and can consist of multiple time slots (eg subframes or OFDM symbols) in which paging DCI can be transmitted. One paging frame (PF, Paging Frame) is one radio frame and may include one or several PO(s) or the starting point of the PO.

PF and PO for paging are determined by the following formula.

The SFN for PF is determined as follows.

(SFN + PF_offset) mod T = (T div N)*(UE_ID mod N)

The index (i_s) indicating the index of the PO is determined by the following.

i_s = floor(UE_ID/N) mod N

The following parameters are used in the above PF and i_s calculations.

T: DRX cycle of the UE.

N: Total number of paging frames in T, broadcast on SIB1.

Ns: paging count for PF, broadcast on SIB1.

PF_offset: Offset used for PF determination, broadcast in SIB1.

UE_ID: 5G-S-TMSI mode 1024

In 2a-11, the GNB-CU (2a-05) transmits the first paging message to the GNB-DU. The first paging message includes paging information for the UE. The first paging message may include the following Information Element (IE). The UE Identity Index value IE is 10-bit information. GNB-DU uses this to calculate paging frames. Paging ID IE is 5G-S-TMSI or primary terminal identifier. If the first paging message is for an idle terminal, 5G-S-TMSI is used. If the first paging message is for an inactive terminal, the first terminal identifier is used. Paging DRX IE indicates the length of the DRX cycle. Paging Cause IE indicates whether paging is for voice. When the Paging Cause IE is included in the first paging message, the first paging message is for voice service. The GNB-CU generates a "first paging message" for the INACTIVE UE when it needs to resume the RRC connection with the UE. The GNB-CU generates a "first paging message" for the IDLE UE when receiving the paging message from the CN. Paging Cause may be included in the “first paging message” for the “RRC_IDLE UE”.

When the first paging message is generated, the GNB-CU transmits the first paging message to the GNB-DU. A plurality of first paging messages may be transmitted as GNB-DUs during a given period.

When the GNB-DU receives the first paging message, it determines a PO (Paging Occasion) for the paging message. The PO or paging opportunity is calculated based on the UE Identity Index value, the UE Identity Index value2, and the paging cycle. The UE Identity Index value corresponds to UE_ID mod N. A UE Identity Index value of 2 corresponds to floor (UE_ID/N).

In 2a-13, the GNB DU generates one second paging message based on the plurality of first paging messages. The second paging message includes paging information for a plurality of terminals. The second paging message includes a first list and a second list. The first list is composed of a plurality of pagingRecord1. The second list is composed of a plurality of pagingRecord2. One pagingRecord1 and one pagingRecord2 are generated based on one first paging message. The number of entries (pagingRecord1) in the first list is equal to the number of entries (pagingRecord2) in the second list. pagingRecord1s in the first list and pagingRecord2s in the second list are listed in the same order.

The GNB-DU includes the 5G-S-TMSI or the first terminal identifier in pagingRecord1 according to the paging ID of the corresponding first paging message.

The GNB-DU includes the first type of pagingRecord2 or the second type of pagingRecord2 in the second list. The first type of pagingRecord2 consists of information indicating that it is pagingRecord2 without any other additional information. The second type of pagingRecord2 consists of one Paging Cause and information indicating pagingRecord2. If the corresponding first paging message does not include Paging Cause, the GNB-DU includes pagingRecord2 of the first type in the second list. If the corresponding first paging message includes Paging Cause, the GNB-DU includes pagingRecord2 of the second type in the second list.

In 2a-15, the GNB-DU transmits the "second paging message" through the paging channel in the determined PO.

In 2a-17, when the UE in RRC_IDLE receives the second paging message, if the ue-Identity included in PagingRecord1 for each PagingRecord1 in the first list matches the UE identifier assigned by the upper layer, whether to initiate the RRC connection establishment process. decide whether If corresponding pagingRecord2 is the second type (ie, pagingRecord2 including Paging Cause), the UE considers paging to be for voice service and initiates an RRC connection establishment procedure. If the corresponding pagingRecord2 is the first type (i.e., pagingRecord2 that does not contain Paging Cause), the UE considers that paging is not a voice service and determines whether to trigger the RRC connection establishment procedure considering the service currently in progress in the other SIM. Decide. The UE identifier assigned by higher layers is 5G-S-TMSI.

Upon receiving the second paging message, the UE of RRC_INACTIVE initiates an RRC connection resumption procedure when the ue-Identity included in PagingRecord1 matches the stored first terminal identifier of the UE.

Upon receiving the second 　paging message　　RRC_INACTIVE UE, if the ue-Identity included in PagingRecord1 matches the UE ID assigned by the upper layer, it moves to RRC_IDLE and determines whether to initiate the RRC connection establishment procedure. If corresponding pagingRecord2 is the second type (ie, pagingRecord2 including Paging Cause), the UE considers paging to be for voice service and initiates an RRC connection establishment procedure. If the corresponding pagingRecord2 is the first type (i.e., pagingRecord2 without Paging Cause), the UE considers that paging is not a voice service and considers the ongoing service for another SIM to determine whether to trigger the RRC connection establishment procedure. do.

In 2a-21, the UE initiates an RRC connection establishment procedure or an RRC connection resumption procedure. In the RRC connection establishment procedure, the terminal transmits an uplink RRC message including the terminal identity assigned by the upper layer. A DU (Distribution Unit) delivers an uplink RRC message to a CU (Central Unit). The CU performs call admission control and decides whether to accept the request. In the RRC connection resumption procedure, the UE transmits an uplink RRC message including the stored secondary terminal identity of the UE. The DU delivers the UL RRC message to the CU. The CU searches the UE context based on the received UE ID and decides whether to accept the request.

3a illustrates the operation of GNB-DU.

In step 3a-11, a plurality of first paging messages are received from a central unit (CU).

In step 3a-13, a second paging message including information of the plurality of first paging messages is transmitted through a paging channel at the determined paging opportunity.

The first paging message includes paging information for one terminal and the second paging message includes paging information for a plurality of terminals.

The first paging message includes a terminal identifier index information element (IE), a paging identifier IE, a paging reason IE, and a paging DRX IE.

The second paging message includes a first list and a second list.

The first list includes a plurality of entries 1 and the second list includes a plurality of entries 2, the number of entries 1 and the number of entries 2 are the same, and the entries 1 and 2 are in the same order. are listed as

One entry 1 includes a first terminal identifier or a third terminal identifier, and one entry 2 is a type 1 entry 2 or a type 2 entry 2 .

The type 1 entry 2 is composed of information indicating entry 2, and the type 2 entry 2 is composed of one paging reason and information indicating entry 2.

One entry 1 and one entry 2 are associated with one first paging message, and if the associated first paging message does not include a paging reason, the type 1 entry 2 is included in the second list, and the associated first paging message is included in the second list. If the paging message includes a paging reason, the type 2 entry 2 is included in the second list.

The paging opportunity is determined by the UE ID index and the paging DRX.

The plurality of entries 1 and the plurality of entries 2 are associated with the same paging opportunity.

If the second paging message includes the first terminal identifier, an uplink RRC message including a second terminal identifier corresponding to the first identifier is received from the terminal, and if the second paging message includes a third terminal identifier If included, an uplink RRC message including the third terminal identifier is received from the terminal.

The first terminal identifier and the second terminal identifier are allocated by the CU, and the third terminal identifier is allocated by the core network.

4A is a block diagram showing the internal structure of a terminal to which the present invention is applied.

Referring to the drawing, the terminal includes a control unit 4a-01, a storage unit 4a-02, a transceiver 4a-03, a main processor 4a-04, and an input/output unit 4a-05.

The controller 4a-01 controls overall operations of the UE related to mobile communication. For example, the controller 4a-01 transmits and receives signals through the transceiver 4a-03. Also, the controller 4a-01 writes and reads data in the storage unit 4a-02. To this end, the controller 4a-01 may include at least one processor. For example, the controller 4a-01 may include a communication processor (CP) that controls communication and an application processor (AP) that controls upper layers such as application programs. The controller 4a-01 controls the storage unit and the transceiver so that the terminal operation of FIG. 2A is performed. The transceiver is also referred to as a transceiver.

The storage unit 4a-02 stores data such as a basic program for operation of the terminal, an application program, and setting information. The storage unit 4a-02 provides stored data according to the request of the control unit 4a-01.

The transver 4a-03 includes an RF processing unit, a baseband processing unit, and an antenna. The RF processing unit performs functions for transmitting and receiving signals through a wireless channel, such as band conversion and amplification of signals. That is, the RF processing unit up-converts the baseband signal provided from the baseband processing unit into an RF band signal, transmits the signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. The RF processing unit may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), and the like. The RF processing unit may perform MIMO, and may receive multiple layers when performing MIMO operation. The baseband processing unit performs a conversion function between a baseband signal and a bit string according to the physical layer standard of the system. For example, during data transmission, the baseband processing unit generates complex symbols by encoding and modulating a transmission bit stream. In addition, when data is received, the baseband processing unit demodulates and decodes the baseband signal provided from the RF processing unit to restore a received bit stream. The transceiver is also referred to as a transceiver.

The main processor 4a-04 controls overall operations except for operations related to mobile communication. The main processor 4a-04 processes the user's input transmitted from the input/output unit 4a-05, stores necessary data in the storage unit 4a-02, and controls the control unit 4a-01 for mobile communication It performs related operations and delivers output information to the input/output unit 4a-05.

The input/output unit 4a-05 is composed of a device that accepts user input, such as a microphone and a screen, and a device that provides information to the user, and performs input and output of user data under the control of the main processor.

Figure 4b is a block diagram showing the configuration of the distribution unit according to the present invention.

As shown in the figure, the distribution unit includes a control unit 4b-01, a storage unit 4b-02, a transceiver 4b-03, and a backhaul interface unit 4b-04.

The controller 4b-01 controls overall operations of the distributing unit. For example, the control unit 4b-01 transmits and receives signals through the transceiver 4b-03 or the backhaul interface unit 4b-04. Also, the controller 4b-01 writes and reads data in the storage unit 4b-02. To this end, the controller 4b-01 may include at least one processor. The controller 4b-01 is a transceiver so that the distribution unit operation shown in Fig. 2a is performed. storage. Controls the backhaul interface.

The storage unit 4b-02 stores data such as a basic program for operation of the main distribution unit, an application program, and setting information. In particular, the storage unit 4b-02 may store information on bearers assigned to the connected terminal, measurement results reported from the connected terminal, and the like. In addition, the storage unit 4b-02 may store information that is a criterion for determining whether to provide or stop multiple connections to the terminal. And, the storage unit 4b-02 provides the stored data according to the request of the control unit 4b-01.

The transceiver 4b-03 includes an RF processing unit, a baseband processing unit, and an antenna. The RF processing unit performs functions for transmitting and receiving signals through a wireless channel, such as band conversion and amplification of signals. That is, the RF processor upconverts the baseband signal provided from the baseband processor into an RF band signal, transmits the signal through an antenna, and downconverts the RF band signal received through the antenna into a baseband signal. The RF processing unit may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. The RF processing unit may perform a downlink MIMO operation by transmitting one or more layers. The baseband processing unit performs a conversion function between a baseband signal and a bit string according to the physical layer standard. For example, during data transmission, the baseband processing unit generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit demodulates and decodes the baseband signal provided from the RF processing unit to restore a received bit stream. The transceiver is also referred to as a transceiver.

The backhaul interface unit 4b-04 provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit 4b-04 converts a bit string transmitted from the distribution unit to another node, for example, a concentrating unit, into a physical signal, and converts a physical signal received from the other node into a bit string. .

Claims (10)

In a wireless communication system, in the DU (Distributed Unit) method,
Receiving a plurality of first paging messages from a central unit (CU); and
Transmitting a second paging message including information of the plurality of first paging messages through a paging channel at the determined paging opportunity;
The first paging message includes paging information for one terminal and the second paging message includes paging information for a plurality of terminals,
The first paging message includes a terminal identifier index information element (IE), a paging identifier IE, a paging reason IE, and a paging DRX IE,
Wherein the second paging message comprises a first list and a second list.
According to claim 1,
the first list includes a plurality of entries 1 and the second list includes a plurality of entries 2;
The number of entries 1 and the number of entries 2 are the same,
Wherein the entry 1 and the entry 2 are listed in the same order.
According to claim 2,
One entry 1 includes a first terminal identifier or a third terminal identifier,
Characterized in that one entry 2 is a type 1 entry 2 or a type 2 entry 2. According to claim 3
The type 1 entry 2 is composed of information indicating entry 2,
The type 2 entry 2 is composed of one paging reason and information indicating entry 2.
According to claim 3,
one entry 1 and one entry 2 are associated with one first paging message;
If the associated first paging message does not include a paging reason, the type 1 entry 2 is included in the second list;
and if the associated first paging message includes a paging reason, type 2 entry 2 is included in the second list.
According to claim 1,
Wherein the paging opportunity is determined by the terminal identifier index and the paging DRX.
According to claim 2,
wherein the plurality of entries1 and the plurality of entries2 are associated with the same paging opportunity.
According to claim 1,
If the second paging message includes the first terminal identifier, receiving an uplink Radio Resource Control (RRC) message including a second terminal identifier corresponding to the first identifier from the terminal,
If the second paging message includes a third terminal identifier, receiving an uplink RRC message including the third terminal identifier from the terminal.
According to claim 8,
Wherein the first terminal identifier and the second terminal identifier are allocated by a CU and the third terminal identifier is allocated by a core network.
In a DU in a wireless communication system,
a transceiver configured to transmit and receive signals; and
It includes a control unit,
The control unit,
Receive a plurality of first paging messages from the CU;
configured to transmit a second paging message including information of the plurality of first paging messages through a paging channel at the determined paging opportunity;
The first paging message includes paging information for one terminal and the second paging message includes paging information for a plurality of terminals,
The first paging message includes a terminal identifier index IE, a paging identifier IE, a paging reason IE, and a paging DRX IE,
DU, characterized in that the second paging message includes a first list and a second list.

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