WO2026031047A1 - Procédés de resélection de cellules fonctionnant dans un mode d'économie d'énergie de réseau - Google Patents

Procédés de resélection de cellules fonctionnant dans un mode d'économie d'énergie de réseau

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Publication number
WO2026031047A1
WO2026031047A1 PCT/CN2024/110623 CN2024110623W WO2026031047A1 WO 2026031047 A1 WO2026031047 A1 WO 2026031047A1 CN 2024110623 W CN2024110623 W CN 2024110623W WO 2026031047 A1 WO2026031047 A1 WO 2026031047A1
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WIPO (PCT)
Prior art keywords
cell
sib1
highest ranked
ranking
margin
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PCT/CN2024/110623
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English (en)
Inventor
Yushu Zhang
Ming-Hung Tao
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Google LLC
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Google LLC
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Priority to PCT/CN2024/110623 priority Critical patent/WO2026031047A1/fr
Publication of WO2026031047A1 publication Critical patent/WO2026031047A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off

Definitions

  • the present disclosure relates generally to wireless communication, and more particularly, to reselection of a cell based on system information block type 1 (SIB1) availability and a reference signal received power (RSRP) value of the cell.
  • SIB1 system information block type 1
  • RSRP reference signal received power
  • the Third Generation Partnership Project (3GPP) specifies a radio interface referred to as fifth generation (5G) new radio (NR) (5G NR) .
  • An architecture for a 5G NR wireless communication system includes a 5G core (5GC) network, a 5G radio access network (5G-RAN) , a user equipment (5G UE) , etc.
  • the 5G NR architecture seeks to provide increased data rates, decreased latency, and/or increased capacity compared to prior generation cellular communication systems.
  • Wireless communication systems in general, provide various telecommunication services (e.g., telephony, video, data, messaging, etc. ) based on multiple-access technologies, such as orthogonal frequency division multiple access (OFDMA) technologies, that support communication with multiple UEs. Improvements in mobile broadband continue the progression of such wireless communication technologies.
  • a type of network energy saving (NES) cell deactivates system information block type 1 (SIB1) transmissions to conserve power.
  • SIB1 system information block type 1
  • UE user equipment
  • the UE incurs increased time and overhead costs associated with requesting/receiving a SIB1.
  • Wireless communication systems implement network energy saving (NES) techniques for purposes of environmental sustainability, such as by reducing greenhouse gas emissions, as well as for operational cost savings through reduced power consumption.
  • Fifth generation (5G) networks for example, are often deployed with dense layouts, using an increased number of antennas, larger bandwidths, and more frequency bands. As such, energy consumption has become a prominent part of network operating costs.
  • NES may be administered in time domain, frequency domain, spatial domain, and/or power domain.
  • NES techniques in time and frequency domains aim to reduce power consumption by refraining from activity in one or more symbols, slots, frames, etc., on one or more carriers, and hence allow the network to perform micro/light/deep “sleep” sessions, depending on an interval of time between contiguous active transmission-reception occasions.
  • NES techniques in spatial and power domains aim to reduce the power consumption of transceiver chains and power amplifiers (PAs) , such as by switching off spatial elements to provide reduced transmission power and/or increase the PA efficiency.
  • PAs power amplifiers
  • NES techniques may cause a network entity to deactivate broadcasting of system information block type 1 (SIB1) transmissions for a cell, such as when there is reduced network demand (e.g., during a non-peak period) . That is, the network entity may refrain from transmitting SIB1 until requested by a user equipment (UE) .
  • UE user equipment
  • the UE incurs increased time and overhead costs to reselect/camp on a cell with deactivated SIB1 transmissions.
  • the UE would first have to request a SIB1 from the network entity to determine from the SIB1 whether the UE can access the cell. The UE typically reselects to a best available cell.
  • reselection to a sub-optimal cell but which has active SIB1 transmissions, rather than reselection to a best available cell that has deactivated SIB1 transmissions, provides the benefit of reducing the signaling overhead for requesting and transmitting the SIB1 while saving energy at both network and the UE.
  • aspects of the present disclosure address the above-noted and other deficiencies of cell reselection procedures by providing for cell reselection to a highest ranked cell including deactivated SIB1 transmissions only when sub-optimal quality cells including activated SIB1 transmissions are outside of a cell quality margin of the highest ranked/highest quality cell.
  • aspects of the present disclosure also address the above-noted and other deficiencies of cell reselection procedures by allowing an idle/inactive UE to change a cell reselection when the UE does not receive a SIB1 from a currently reselected cell within a threshold time period after transmitting an uplink wakeup signal (WUS) and/or receiving a random access response (RAR) .
  • WUS uplink wakeup signal
  • RAR random access response
  • the UE receives, from a first network entity of a first cell, a configuration for reselection to a highest ranked cell including deactivated SIB1 transmissions when other non-highest ranked cells including activated SIB1 transmissions are outside of a ranking margin.
  • the ranking margin is a relative reference signal received power (RSRP) value from a first RSRP value of the highest ranked cell.
  • the UE performs, based on the configuration, a procedure for reselection to a second cell.
  • the UE communicates with a second network entity of the second cell based on an outcome of the procedure.
  • Fig. 1A is a block diagram of an example wireless communication system including a user equipment (UE) , base stations, and a core network.
  • UE user equipment
  • Fig. 1B is a block diagram of an example base station including a centralized unit (CU) and a distributed unit (DU) that can operate in the system of Fig. 1A.
  • CU centralized unit
  • DU distributed unit
  • Fig. 2 is a block diagram of an example protocol stack according to which the UE of Fig. 1A communicates with a CU and a DU.
  • Fig. 3 illustrates an example in which an idle/inactive UE performs a cell reselection determination based on both system information block type 1 (SIB1) availability and reference signal received power (RSRP) values of a plurality of cells.
  • SIB1 system information block type 1
  • RSRP reference signal received power
  • Fig. 4 illustrates an example procedure for an idle/inactive UE to request the on-demand SIB1 transmission from a network energy saving (NES) cell that is not currently transmitting SIB1.
  • NES network energy saving
  • Fig. 5A is a signaling diagram of an example UE in the idle/inactive state that reselects to a cell transmitting SIB1 (i.e., non-NES cell) with a cell ranking that is within a configured ranking margin of a highest ranked cell.
  • SIB1 i.e., non-NES cell
  • Fig. 5B is a signaling diagram of an example UE in the idle/inactive state that reselects to a cell transmitting SIB1 (i.e., non-NES cell) and has a greatest number of qualified beams among cells within the configured ranking margin.
  • SIB1 i.e., non-NES cell
  • Fig. 5C is a signaling diagram of an example UE in the idle/inactive state that reselects to a cell not transmitting SIB1 (i.e., NES cell) based on the cell having the highest ranking and no other cell being within the ranking margin.
  • SIB1 i.e., NES cell
  • Fig. 6A is a signaling diagram of an example UE in the idle/inactive state that waits for a SIB1 transmission for a configured maximum time period, after transmitting an uplink (UL) wakeup signal (WUS) to the network.
  • UL uplink
  • WUS wakeup signal
  • Fig. 6B is a signaling diagram of an example UE in the idle/inactive state that waits for the SIB1 transmission for a configured maximum time period corresponding to a UE mobility state, after transmitting an UL WUS to the network.
  • Fig. 7A is a flow diagram of an example method implemented by a UE in the idle/inactive state for determining a cell for cell reselection based on the cell ranking, the SIB1 availability, and the number of qualified beams of the cell.
  • Fig. 7B is a flow diagram of an example method implemented by a UE in the idle/inactive state for determining a cell for cell reselection based on the cell ranking and the SIB1 availability of the cell.
  • Fig. 8A is a flow diagram of an example method implemented by a UE in the idle/inactive state for monitoring the SIB1 transmission for a maximum duration after receiving an acknowledgement for an UL WUS transmission.
  • Fig. 8B is a flow diagram of an example method implemented by a UE in the idle/inactive state for monitoring the SIB1 transmission for a maximum duration corresponding to a UE mobility state, after receiving an acknowledgement for an UL WUS transmission.
  • Fig. 9 is a flow diagram of an example method implemented by a base station for configuring the UE (s) with a cell ranking margin used to prioritize cells transmitting SIB1 over other cells not transmitting SIB1 in the cell reselection procedure, and/or configure the UE (s) with a maximum duration for monitoring the SIB1 transmission after receiving the acknowledgement of the UL WUS transmission.
  • Fig. 10 is a flowchart of an example method of wireless communication at a UE according to an embodiment.
  • Fig. 11 is a flowchart of an example method of wireless communication at a network entity according to an embodiment.
  • Fig. 12 is a diagram illustrating a hardware implementation for an example UE apparatus according to some embodiments.
  • Fig. 13 is a diagram illustrating a hardware implementation for one or more example network entities according to some embodiments.
  • Fig. 1A is a block diagram of an example wireless communication system 100 including a user equipment (UE) 102, base stations 104-106, and a core network 110.
  • the UE 102 and/or a network entity of a radio access network (RAN) 105 can use the techniques of this disclosure for managing data communication and transitioning a UE 102 between states of a protocol for controlling radio resources between the UE 102 and the RAN 105.
  • RAN radio access network
  • the example wireless communication system 100 includes a UE 102, a first base station (BS) 104, a second base station 106, and a core network (CN) 110.
  • the base stations 104 and 106 can operate in a RAN 105 connected to the core network (CN) 110.
  • the CN 110 can be implemented as an evolved packet core (EPC) 111 or a fifth generation (5G) core (5GC) 160, for example.
  • the CN 110 can also be implemented as a sixth generation (6G) core in another example.
  • the base station 104 covers a cell 124, and the base station 106 covers a cell 126.
  • the cell 124 is a new radio (NR) cell.
  • the base station 104 is a next generation-evolved Node B (ng-eNB) or evolved Node B (eNB)
  • the cell 124 is an evolved universal terrestrial radio access (E-UTRA) cell.
  • the base station 106 is a gNB
  • the cell 126 is an NR cell
  • the base station 106 is an ng-eNB or eNB
  • the cell 126 is an E-UTRA cell.
  • the cells 124 and 126 can be in the same Radio Access Network Notification Areas (RNA) or different RNAs.
  • the RAN 105 can include any number of base stations, and each of the base stations can cover one, two, three, or any other suitable number of cells.
  • the UE 102 can support at least a 5G NR (or simply, “NR” ) or E-UTRA air interface to communicate with the base stations 104 and 106.
  • Each of the base stations 104, 106 can connect to the CN 110 via an interface (e.g., S1 or next generation (NG) interface) .
  • the base stations 104 and 106 can interconnect via an interface (e.g., X2 or Xn interface) for interconnecting NG RAN nodes.
  • the EPC 111 can include a Serving Gateway (SGW) 112, a Mobility Management Entity (MME) 114, and a Packet Data Network Gateway (PGW) 116.
  • SGW Serving Gateway
  • MME Mobility Management Entity
  • PGW Packet Data Network Gateway
  • the SGW 112 in general is configured to transfer user-plane packets related to audio calls, video calls, Internet traffic, etc.
  • the MME 114 is configured to manage authentication, registration, paging, and other related functions.
  • the PGW 116 provides connectivity from the UE to one or more external packet data networks, e.g., an Internet network and/or an Internet Protocol (IP) Multimedia Subsystem (IMS) network.
  • IP Internet Protocol
  • IMS Internet Multimedia Subsystem
  • the 5GC 160 includes a User Plane Function (UPF) 162 and an Access and Mobility Management Function (AMF) 164, and/or Session Management Function (SMF) 166.
  • UPF User Plane Function
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • the UPF 162 is configured to transfer user-plane packets related to audio calls, video calls, Internet traffic, etc.
  • the AMF 164 is configured to manage authentication, registration, paging, and other related functions
  • the SMF 166 is configured to manage protocol data unit (PDU) sessions.
  • PDU protocol data unit
  • the base station 104 supports a cell 124
  • the base station 106 supports a cell 126.
  • the cells 124 and 126 can partially overlap, so that the UE 102 can select, reselect, or hand over from one of the cells 124 and 126 to the other.
  • the base station 104 and base station 106 can support an X2 or Xn interface.
  • the CN 110 can connect to any suitable number of base stations supporting NR cells and/or EUTRA cells.
  • the UE 102 and/or the RAN 105 may utilize the techniques of this disclosure when the radio connection between the UE 102 and the RAN 105 is suspended, e.g., when the UE 102 operates in an inactive or idle state of the protocol for controlling radio resources between the UE 102 and the RAN 105.
  • the examples below refer to the radio resource control (RRC) _INACTIVE or RRC_IDLE state of the RRC protocol.
  • the base station 104 is equipped with processing hardware 130 that can include one or more general-purpose processors (e.g., central processing units (CPUs) ) and a non-transitory computer-readable memory storing instructions that the one or more general-purpose processors execute. Additionally or alternatively, the processing hardware 130 can include special-purpose processing units.
  • the processing hardware 130 in an example implementation includes a processor 132 to process data that the base station 104 will transmit in the downlink direction, or process data received by the base station 104 in the uplink direction.
  • the processing hardware 130 can also include a transmitter 136 configured to transmit data in the downlink direction.
  • the processing hardware further can include a receiver 134 configured to receive data in the uplink direction.
  • the base station 106 can include generally similar components. In particular, components 140, 142, 144, and 146 of the base station 106 can be similar to the components 130, 132, 134, and 136, respectively.
  • the UE 102 is equipped with processing hardware 150 that can include one or more general-purpose processors such as CPUs and non-transitory computer-readable memory storing machine-readable instructions executable on the one or more general-purpose processors, and/or special-purpose processing units.
  • the processing hardware 150 in an example implementation includes a processor 152 to process data that the UE 102 will transmit in the uplink direction, or process data received by UE 102 in the downlink direction.
  • the processing hardware 150 can also include a transmitter 156 configured to transmit data in the downlink direction.
  • the processing hardware further can include a receiver 154 configured to receive data in the uplink direction.
  • Fig. 1B is a block diagram of an example base station 104/106 including a centralized unit (CU) 172 and a distributed unit (DU) 174 that can operate in the system of Fig. 1A.
  • the example block diagram can be in a distributed or disaggregated implementation of any one or more of the base stations 104, 106.
  • the base station 104, 106 includes a CU 172 and one or more distributed units (DUs) 174.
  • the CU 172 includes processing hardware, such as one or more general-purpose processors (e.g., CPUs) and a computer-readable memory storing machine-readable instructions executable on the general-purpose processor (s) , and/or special-purpose processing units.
  • the CU 172 can include a packet data convergence protocol (PDCP) controller, an RRC controller, and/or an RRC inactive controller.
  • the CU 172 can include a radio link control (RLC) controller configured to manage or control one or more RLC operations or procedures.
  • the CU 172 does not include an RLC controller.
  • Each of the DUs 174 also includes processing hardware that can include one or more general-purpose processors (e.g., CPUs) and computer-readable memory storing machine-readable instructions executable on the one or more general-purpose processors, and/or special-purpose processing units.
  • the processing hardware can include a medium access control (MAC) controller configured to manage or control one or more MAC operations or procedures (e.g., a random access procedure) , and/or an RLC controller configured to manage or control one or more RLC operations or procedures.
  • the process hardware can also include a physical layer controller configured to manage or control one or more physical layer operations or procedures.
  • the RAN 105 supports Integrated Access and Backhaul (IAB) functionality.
  • the DU 174 operates as an IAB-node, and the CU 172 operates as an IAB-donor.
  • the RAN 105 supports Non-Terrestrial Network (NTN) functionality.
  • IAB Integrated Access and Backhaul
  • NTN Non-Terrestrial Network
  • the CU 172 can include a logical node central unit-control plane (CU-CP) 172A that hosts the control plane part of the PDCP protocol of the CU 172.
  • the CU 172 can also include logical node (s) central unit-user plane (CU-UP) 172B that hosts the user plane part of the PDCP protocol and/or Service Data Adaptation Protocol (SDAP) protocol of the CU 172.
  • the CU-CP 172A can transmit control information (e.g., RRC messages, F1 application protocol messages)
  • the CU-UP 172B can transmit the data packets (e.g., SDAP PDUs or Internet Protocol packets) .
  • the CU-CP 172A connects to one or more CU-UP 172B through the E1 interface.
  • the CU-CP 172A selects the appropriate CU-UP 172B for the requested services for the UE 102.
  • a single CU-UP 172B can connect to multiple CU-CP 172A through the E1 interface.
  • the CU-CP 172A can connect to one or more DU 174s through an F1-C interface/W1-C interface.
  • the CU-UP 172B can connect to one or more DU 174 through the F1-U interface/W1-U interface under the control of the same CU-CP 172A.
  • one DU 174 can connect to multiple CU-UP 172B under the control of the same CU-CP 172A.
  • the connectivity between a CU-UP 172B and a DU 174 is established by the CU-CP 172A using Bearer Context Management functions.
  • Fig. 2 is a block diagram of an example protocol stack 200 according to which the UE 102 of Fig. 1A communicates with a DU (e.g., DU 174) and a CU (e.g., CU 172) .
  • the radio protocol stack 200 is functionally split as shown by the radio protocol stack 200 in Fig. 2.
  • the CU 172 at any of the base stations 104 or 106 can hold all the control and upper layer functionalities (e.g., RRC 214, SDAP 212, NR PDCP 210) , while the lower layer operations (e.g., NR RLC 206B, NR MAC 204B, and NR physical (PHY) 202B) are delegated to the DU 174.
  • RRC 214 control and upper layer functionalities
  • SDAP 212 e.g., SDAP 212, NR PDCP 210
  • the lower layer operations e.g., NR RLC 206B, NR MAC 204B,
  • NR PDCP 210 provides signaling radio bearers (SRBs) to RRC 214, and NR PDCP 210 provides data radio bearers (DRBs) to SDAP 212 and SRBs to RRC 214.
  • SRBs signaling radio bearers
  • DRBs data radio bearers
  • Figs. 1A-2 illustrate aspects of wireless communication systems
  • Fig. 3 illustrates an example implementation of a network energy saving (NES) technique within a wireless communication system.
  • NES network energy saving
  • Fig. 3 is a diagram 300 in which an idle/inactive UE 102 performs a cell reselection determination based on both system information block type 1 (SIB1) availability and reference signal received power (RSRP) values of a plurality of cells 124-128.
  • SIB1 system information block type 1
  • RSRP reference signal received power
  • NES may be administered in time domain, frequency domain, spatial domain, and/or power domain.
  • NES techniques include synchronization signal block (SSB) -less secondary cell (SCell) operations for inter-band carrier aggregation (CA) for frequency range 1 (FR1) and co-located cells.
  • the UE 102 measures SSBs transmitted on a primary cell (PCell) or another SCell for time/frequency synchronization, downlink automatic gain control (AGC) , and layer 1/layer 3 (L1/L3) measurements.
  • PCell primary cell
  • AGC downlink automatic gain control
  • L1/L3 layer 1/layer 3
  • NES techniques further relate to SCell activation procedures, such as through an alignment of cell discontinuous transmission (DTX) /discontinuous reception (DRX) and UE DRX in RRC_CONNECTED mode, and through an exchange of inter-node information on the cell DTX/DRX.
  • SCell activation procedures such as through an alignment of cell discontinuous transmission (DTX) /discontinuous reception (DRX) and UE DRX in RRC_CONNECTED mode, and through an exchange of inter-node information on the cell DTX/DRX.
  • CSI channel state information
  • beam management procedures such as measurement and report procedures
  • signaling to enable more efficient adaptation of spatial elements (e.g., antenna ports, active transceiver chains) and power offset values between a physical downlink shared channel (PDSCH) and a channel sate information-reference signal (CSI-RS) .
  • PDSCH physical downlink shared channel
  • CSI-RS channel sate information-reference signal
  • NES techniques may prevent legacy UEs from camping on NES cells 128c, conditional handover (CHO) procedures from a non-NES source/camped cell 124 to an NES neighbor/target cell 128c, inter-node beam activation restrictions on paging within a limited area, and radio resource management (RRM) /radio frequency (RF) procedures.
  • RRM radio resource management
  • RF radio frequency
  • NES implementations support on-demand SSB SCell operations for UEs in connected mode configured with CA for both intra-band and inter-band CA.
  • SSB triggering techniques from an NES cell 128c include using an uplink wakeup signal (WUS) from the UE 102 to select a signal/channel for the SSB, on/off SSB indications via backhaul, and SCell activation/deactivation signalling.
  • WUS uplink wakeup signal
  • the UE 102 receives on-demand SSB transmissions for at least one of SCell time/frequency synchronization, L1/L3 measurements, and SCell activation, which is supported for both FR1 and frequency range 2 (FR2) in non-shared spectrum.
  • FR2 frequency range 2
  • NES implementations also support on-demand SIB1 transmissions for an idle/inactive UE 102.
  • a network entity of a camped cell 124 may provide a WUS configuration to the UE 102, such that the UE 102 triggers a SIB1 transmission from the NES cell 128c using an uplink WUS.
  • the uplink WUS indicates a signal/channel selection for requesting the SIB1 transmission.
  • Network entities of the cells 124-128 may exchange information related to the WUS configuration.
  • the network entities may implement common signal/channel transmissions through an adaptation in time domain of an SSB (e.g., periodicity) , a physical random access channel (PRACH) , a paging occasion, and/or an adaptation of the PRACH in spatial domain (e.g., non-uniform PRACH resources per SSB) .
  • an SSB e.g., periodicity
  • PRACH physical random access channel
  • a paging occasion e.g., a paging occasion
  • an adaptation of the PRACH in spatial domain e.g., non-uniform PRACH resources per SSB
  • Configuring the UE 102 to request an on-demand SIB1 from a neighbor cell 128 may indicate that SIB1 transmissions of at least one neighbor cell 128 may not be in an always-on state.
  • a network entity of the NES neighbor cell 128c can switch off SIB1 transmissions from the NES neighbor cell 128c for energy saving purposes.
  • the network entity may switch-on the SIB1 transmissions from the neighbor cell 128c for a period of time, such as in response to receiving an uplink WUS from the UE 102 (also referred to as a cell WUS) requesting the on-demand SIB1.
  • the network entity of the camped cell 124 transmits, to the UE 102, the uplink WUS configuration for the UE 102 to transmit the uplink WUS to a network entity of an NES neighbor cell 128c with deactivated SIB1 transmissions.
  • the UE 102 transmits the uplink WUS to the NES neighbor cell 128c after the UE 102 performs a reselection determination to the NES neighbor cell 128c, e.g., based on an intra-frequency or inter-frequency cell re-selection procedure/criteria.
  • the UE may camp on the NES neighbor cell 128c, e.g., based on the RSRP value of the NES neighbor cell 128c.
  • the UE 102 of the diagram 300 measures the RSRP of three cells, including the non-NES camped cell 124, a non-NES neighbor cell 128b with activated SIB1 transmissions, and an NES neighbor cell 128c with deactivated SIB1 transmissions.
  • the non-NES camped cell 124 and the non-NES neighbor cell 128b may be legacy cells with always-on SIB1 transmissions.
  • “non-NES cell” may also refer to a cell that is not currently in an energy saving mode, e.g., because SIB1 transmissions are currently activated for the cell, but the cell still has NES capabilities. That is, non-NES cell refers to whether the cell currently has active SIB1 transmissions.
  • the idle/inactive UE 102 is initially on the camped cell 124 at time T 1 but, based on movement of the UE 102, the RSRP for the camped cell 124 has dropped below an RSRP threshold between T 1 and T 2 .
  • the UE 102 determines to perform the neighbor cell measurement on neighbor cells 128.
  • the UE 102 is within an overlapped region of the non-NES neighbor cell 128b and the NES neighbor cell 128c, where the overlapped region represents both neighbor cells 128 being qualified for cell reselection.
  • the RSRP measured by the UE 102 for the three cells 124, 128b, 128c is different at time T 1 than at time T 2 based on the movement/location of the UE 102 between times T 1 to T 2 .
  • the RSRP of the camped cell 124 is the highest RSRP, followed by the RSRP of the NES neighbor cell 128c, and lastly by the RSRP of the non-NES neighbor cell 128b. Because the RSRP of the camped cell 124 is the highest RSRP at time T 1 , the UE 102 remains camped on the camped cell 124 at time T 1 .
  • the RSRP of the camped cell 124 is the lowest RSRP measured by the UE 102.
  • the RSRP of the NES neighbor cell 128c is the highest RSRP measured by the UE 102 at time T 2 , followed by the RSRP of the non-NES neighbor cell 128b.
  • the RSRP of the NES neighbor cell 128c is the highest RSRP measured by the UE 102 at time T 2
  • reselecting to an NES cell with deactivated SIB1 transmissions introduces overhead and consumes more power at the UE 102 compared to reselecting to a cell with already-activated SIB1 transmissions (e.g., non-NES neighbor cell 128b) . Accordingly, it may not be a best practice for the UE 102 to always reselect to the neighbor cell 128 with the highest RSRP when SIB1 transmissions for the neighbor cell are currently deactivated.
  • the UE 102 may determine to reselect to the non-NES neighbor cell 128b with active SIB1 transmissions when the RSRP of the non-NES neighbor cell 128b is within a threshold RSRP value/range of the NES neighbor cell 128c with the highest RSRP measured by the UE 102.
  • Fig. 3 demonstrates a drawback of certain cell reselection procedures
  • Fig. 4 illustrates how the UE 102 performs such cell reselection procedures.
  • Fig. 4 an illustrates example procedure 400 for an idle/inactive UE 102 to request the on-demand SIB1 transmission from an NES cell 128a that is not currently transmitting SIB1.
  • the UE 102 determines to reselect to the cell 128a as the new serving cell of the UE 102 based on an RSRP measurement of the cell 128a, as described with respect to Fig. 3.
  • the UE 102 determines that the cell 128a has deactivated/switched off 410 SIB1 transmissions from the cell 128a.
  • the UE 102 receives 412, from the cell 128a, a physical broadcast channel (PBCH) indicating that SIB1 is not transmitted on the cell 128a.
  • PBCH physical broadcast channel
  • the indication may be an implicit indication or an explicit indication included in the PBCH transmission from the cell 128a.
  • the cell 128a indicates whether the cell provides SIB1 by configuring a specific value (s) in ssb-SubcarrierOffset (see TS 38.213, clause 13) in the PBCH master information block (MIB) .
  • the cell 128a indicates whether the cell provides SIB1 by using a one-bit indication (e.g., SIB1_status) in the PBCH, such as by replacing a spare bit in the legacy MIB.
  • the cell 128a indicates whether the cell provides SIB1 by configuring a specific value (s) in pdcch-ConfigSIB1 (e.g., by not configuring the search space zero or control resource set zero) .
  • the UE 102 may receive 404, from the cell 128a, an uplink WUS configuration indicating the uplink resources for requesting the on-demand SIB1 from the cell 128a. In other examples, the UE 102 receives the uplink WUS configuration from a different cell (not shown) .
  • the UE 102 transmits 422, to the cell 128a based on the uplink WUS configuration, the uplink WUS requesting the on-demand SIB1 transmission from the cell 128a.
  • a network entity of the cell 128a transmits 424, to the UE 102, a random access response (RAR) message acknowledging the uplink WUS transmission from the UE 102.
  • RAR random access response
  • the UE 102 Based on the acknowledgment of the uplink WUS, the UE 102 enters a waiting time 426 to receive an indication from the network entity of the cell 128a that a SIB1 will be transmitted to the UE 102 for the cell 128a. While the SIB1 indicates whether the cell 128a is accessible to the UE 102, there is no guaranteed time period for the waiting time 426 (e.g., maximum duration) for receiving the SIB1 from the network entity. Hence, the UE 102 may wait for a long time before network entity determines 430 to transmit the SIB1 for the cell 128a. The waiting time 426 for the SIB1 may prolong the cell reselection procedure, prevent the UE 102 from reselecting to another cell, and/or eventually decrease the idle/inactive mode mobility performance.
  • the waiting time 426 for the SIB1 may prolong the cell reselection procedure, prevent the UE 102 from reselecting to another cell, and/or eventually decrease the idle/
  • the UE 102 receives 432, in combination with the waiting time 426, a PBCH indicating that a SIB1 will be transmitted for the cell 128a.
  • the UE 102 determines that the UE 102 will not receive a SIB1 for the cell 128a, and performs another cell reselection determination to a different cell than the cell 128a, perhaps restarting the reselection procedure with the different cell.
  • the UE 102 may determine that the UE 102 will not be receiving the SIB1 for the cell 128a based on an implicit or explicit indication included in the PBCH transmission 432 or based on the UE 102 not receiving the PBCH transmission 432.
  • the UE 102 receives 440 the SIB1 for the cell 128a after receiving 432 the PBCH indication that the SIB1 will be transmitted to the UE 102.
  • the reselection procedure of Fig. 4 assumes the UE 102 reselecting to a highest ranked cell based on a highest measured RSRP
  • the reselection procedures of Figs. 5A-5C permit the UE 102 to reselect to a non-highest ranked cell 128b when the non-highest ranked cell is within a ranking margin of the highest ranked cell, the ranking margin being a relative RSRP value/range from the highest measured RSRP value of the highest ranked cell.
  • Fig. 5A is a signaling diagram 500A of an example UE 102 in the idle/inactive state that reselects to a cell 128b transmitting SIB1 (i.e., non-NES cell) with a cell ranking that is within a configured ranking margin of a highest ranked cell 128c (i.e., NES cell) .
  • SIB1 i.e., non-NES cell
  • NES cell i.e., NES cell
  • the terms “idle” and “inactive” as used herein, such as in reference to the idle/inactive state of the UE 102, may indicate the RRC_IDLE state or the RRC_INACTIVE state.
  • the term “connected” as used herein with reference to the connected state may indicate the RRC_CONNECTED state.
  • a UE 102 that is camped on a first cell 124 and operating 502 in the idle/inactive state receives 504 an uplink WUS configuration indicating uplink resources for requesting an on-demand SIB1 from a neighbor cell 128.
  • the UE 102 may receive 504, the uplink WUS configuration from a first network entity of the first cell 124 (e.g., serving cell) or from a different cell.
  • the UE 102 receives 504 the uplink WUS configuration in system information.
  • the UE 102 receives 504 the uplink WUS configuration via RRC message (e.g., RRCRelease message or RRCConnectionRelease message) while the UE is still in the connected state.
  • RRC message e.g., RRCRelease message or RRCConnectionRelease message
  • the first cell 124 includes active SIB1 transmissions, either because the first cell 124 is a legacy cell with always-on SIB1 transmissions or because the first cell 124 is a cell with NES capabilities that is not currently operating in an energy saving mode because the first cell 124 has activated SIB1 transmissions. Both types of conditions may be referred to herein as non-NES cells (e.g., because neither condition includes cells that are operating in an energy saving mode) .
  • the UE 102 and a first network entity of the first cell 124 are close to a second network entity of a second cell 128b and a third network entity of a third cell 128c.
  • the second cell 128b is a non-NES cell with active SIB1 transmissions
  • the third cell 128c is an NES cell with deactivated SIB1 transmissions.
  • the UE 102 may receive 516, from the first network entity of the first cell 124, a configuration for a cell ranking margin value (i.e., a rangeToBestCell-NES value, denoted as R NES ) that applies to instances where a best/highest ranked cell in a cell reselection determination does not transmit SIB1, such as for network energy saving purposes.
  • the cell ranking margin permits the UE 102 to reselect to a non-highest ranked cell when the non-highest ranked cell includes active SIB1 transmissions and is within the cell ranking margin.
  • the UE 102 receives 516 the ranking margin value R NES via system information, such as in a SIB type 2 (SIB2) .
  • SIB2 SIB type 2
  • the UE 102 receives the ranking margin value R NES via dedicated RRC message (e.g., RRCRelease message or RRConnectionRelease message) while the UE is still in the connected state.
  • the network configures multiple cell ranking margin values, e.g., R NES , where different cell ranking margin values are associated with different NES cells not transmitting SIB1.
  • the UE 102 may reselect to a non-NES cell (i.e., a cell transmitting SIB1) with a ranking that is greater than R n -R NES, n , where R NES, n indicates the configured ranking margin corresponding to the cell n.
  • a non-NES cell i.e., a cell transmitting SIB1
  • R NES, n indicates the configured ranking margin corresponding to the cell n.
  • the UE 102 may determine the R NES based on a default value (e.g., 0) .
  • the UE 102 periodically measures the signal strength/quality of the first cell 124 (i.e., current serving cell) to determine whether the signal strength/quality of the first cell 124 is above a threshold. If the UE 102 detects that the signal strength/quality of the first cell 124 falls below the threshold, the UE 102 performs 518 an inter-frequency and/or intra-frequency measurement on the neighboring cells 128. In some examples, the UE 102 detects that the neighbor cells 128b-128c are operating in the same frequency as the serving cell 124.
  • the UE 102 While performing 518 the measurement (s) on the neighboring cells 128 and/or the serving cell 124, the UE 102 receives 512 a first SSB with a PBCH indicating that the third cell 128c is not transmitting SIB1 and a second SSB with a PBCH indicating that the second cell 128b is transmitting SIB1. That is, the UE 102 determines that the third cell 128c is an NES cell and the second cell 128b is a non-NES cell.
  • an existing field/indication e.g., ssb-SubcarrierOffset
  • a new field/indication e.g., a new bit replacing a spare bit in the PBCH
  • the UE 102 After performing 518 the measurements on the serving cell 124 and the neighboring cells 128, the UE 102 performs 536A, based on the configuration, a procedure for cell reselection.
  • the UE 102 derives/calculates 536A-1, based on measured RSRPs, a cell ranking for each of the serving cell 124 (R s_124 ) and the neighboring cells 128 (R n_128c and R n_128b ) , and obtains a result that R n_128c > R n_128b >R s_124 .
  • the UE configuration is to reselect a cell 128b transmitting SIB1 when an RSRP value of the cell 128b transmitting SIB1 is within a ranking margin of the highest ranked cell 128c (R n_128b > R n_128c -R nes ) , where the highest ranked cell 128c is not transmitting SIB1, and when an RSRP value of the serving cell 124 is outside the ranking margin (R s_124 ⁇ R n_128c -R nes ) .
  • R s_124 ⁇ R n_128c -R nes the ranking margin
  • the UE 102 determines 536A-2 to reselect the second cell 128b as the new serving cell for paging monitoring based on the cell ranking for the second cell 128b (i.e., R n_128b ) being within the cell ranking margin (i.e., R nes ) of the best cell ranking (i.e., R n_128c ) , and the cell ranking for the serving cell 124 (i.e., R s_124 ) not being within the cell ranking margin (i.e., R nes ) of the best cell ranking (i.e., R n_128c ) .
  • the UE 102 may determine to reselect the cell with the highest RSRP value/highest rank among the multiple non-highest ranked cells 128b n .
  • Fig. 5A describes a cell reselection procedure 536A based on a cell ranking
  • Fig. 5B describes a cell reselection procedure 536B based on a number of qualified beams.
  • Fig. 5B is a signaling diagram 500B of an example UE 102 in the idle/inactive state that reselects to a cell 128b transmitting SIB1 (i.e., non-NES cell) and has a greatest number of qualified beams above a threshold among cells 128 within the configured ranking margin.
  • SIB1 i.e., non-NES cell
  • Elements 502, 504, 516, 518, 512, 513, 538b, and 540b have already been described with respect to Fig. 5A.
  • the UE 102 may detect that multiple non-highest ranked cells transmitting SIB1 (i.e., multiple non-NES cells) are within the ranking margin.
  • the UE 102 is configured to perform 536B a procedure to determine which non-NES cell of the multiple non-highest ranked, non-NES cells within the ranking margin to reselect.
  • the UE 102 is configured to reselect a non-NES cell (from the multiple non-highest ranked, non-NES cells within the ranking margin) with the greatest number of qualified beams.
  • a beam is considered a qualified beam if the beam includes an RSRP, a reference signal received quality (RSRQ) , or a signal to interference plus noise ratio (SINR) above a threshold (e.g., absThreshSS-BlocksConsolidation) configured by the network.
  • RSRP reference signal received quality
  • SINR signal to interference plus noise ratio
  • the network configures multiple thresholds, where different thresholds correspond to different beams (e.g., SSBs/CSI-RSs) or different beam groups (e.g., SSB/CSI-RS groups) .
  • the network may also configure the beams (e.g., SSBs/CSI-RSs) within a beam group (e.g., SSB/CSI-RS group) .
  • the cell reselection determination may be based on UE implementation.
  • the UE 102 begins the cell reselection procedure 536B by calculating 536B-1 a cell ranking for each of the serving cell 124 (R s_124 ) and the neighboring cells 128 (R n_128c and R n_128b ) .
  • the UE 102 may calculate 536A-1 the cell ranking for the serving cell (i.e., R s ) and the cell ranking for each neighboring cell (i.e., R n ) , as described above with respect to Fig. 5A.
  • the UE 102 obtains a result that R n_128c > R s_124 > R n_128b .
  • multiple non-NES cells R s_124 and R n_128b
  • the current serving cell 124 is a non-NES cell with a higher rank than the non-NES neighbor cell 128b.
  • the reselection procedure 536B may prioritize a number of qualified beams within each cell over a simple ranking of each cell to determine the cell reselection.
  • the UE 102 determines 536B-2 to reselect the non-NES neighbor cell 128b as the new serving cell, rather than remaining camped on the current serving cell 124, based on the non-NES neighbor cell 128b being within the ranking margin and having more qualified beams than the current non-NES serving cell 124 that is also within the ranking margin.
  • the UE 102 is configured to reselect a non-NES cell from the multiple non-highest ranked, non-NES cells within the ranking margin with the highest ranking among the multiple non-NES cells. That is, the UE 102 does not consider the number of qualified beams among each of the multiple cells, but instead performs the cell reselection determination based on the cell rankings of the multiple non-NES cells within the ranking margin. In examples where multiple non-NES cells are within the cell ranking margin and with the same cell ranking, the cell reselection determination may be based on UE implementation.
  • Figs. 5A-5B describe examples where at least one non-NES cell is within the ranking margin
  • Fig. 5C describes an example where there are no non-NES cells within the ranking margin.
  • Fig. 5C is a signaling diagram 500C of an example UE 102 in the idle/inactive state that reselects to a cell not transmitting SIB1 (i.e., NES cell) based on the cell having the highest ranking and no other available cell being within the ranking margin.
  • SIB1 i.e., NES cell
  • the UE 102 After performing 518 the measurements on the serving cell 124 and the neighboring cells 128, the UE 102 performs 536C, based on the configuration, a procedure for cell reselection.
  • the UE 102 begins the cell reselection procedure by calculating 536C-1 a cell ranking for each of the serving cell 124 (R s_124 ) and the neighboring cells 128 (R n_128c and R n_128b ) .
  • the UE 102 may calculate 536C-1 the cell ranking for the serving cell (i.e., R s ) and the cell ranking for each neighboring cell (i.e., R n ) , as described above with respect to Fig. 5A.
  • the UE 102 obtains a result that R n_128c > R s_124 ⁇ R n_128b .
  • the result indicates that the ranking of the non-NES neighbor cell 128b is not greater than the ranking of the current serving cell 124 and, in particular, the non-NES neighbor cell 128b is not within the configured cell ranking margin of the highest ranked cell (R n_128c ) , the highest ranked cell 128c being an NES cell.
  • the UE 102 determines 536C-2 to reselect the highest ranked cell 128c (i.e., an NES cell) as the new serving cell based on the non-NES neighbor cell 128b and the non-NES serving cell 124 (and any other available non-NES cell) being outside the configured ranking margin.
  • the highest ranked cell 128c i.e., an NES cell
  • the UE 102 determines 536C-2 to reselect an NES neighbor cell 128c that is not currently transmitting SIB1, the UE 102 has to request a SIB1 from the NES neighbor cell 128c. See Fig. 4.
  • the UE 102 transmits 522, to a third network entity of a third cell (i.e., NES neighbor cell 128c) , an uplink WUS requesting an on-demand SIB1 transmission.
  • the UE 102 may transmit 522 the uplink WUS to the NES neighbor cell 128c based on the uplink WUS configuration that the UE 102 received 504 from the serving cell 124.
  • the third network entity of the third cell 128c may transmit 524 an RAR message to the UE 102 acknowledging the uplink WUS. Thereafter, the third network entity of the third cell begins broadcasting SIB1.
  • the UE 102 may receive/acquire 540c the on-demand SIB1 from the third cell 128c, where the on-demand SIB1 indicates that the third cell 128c is not a restricted/barred cell for the UE 102.
  • the UE 102 may successfully reselect and downlink-synchronize 538c with the third cell/NES neighbor cell 128c.
  • Figs. 5A-5C describe examples where at least one non-NES cell is available for consideration by the UE 102 in a cell reselection determination 536-2
  • Figs. 6A-6B describes examples where there are no non-NES cells available for consideration by the UE 102 (or at least no available non-NES cells within the configured ranking margin)
  • Figs. 6A-6B might be an extension of, and/or subordinate to, Figs. 5A, 5B, and particularly to Fig. 5C.
  • the UE 102 may perform elements/procedures of Figs. 6A-6B in order to successfully reselect and downlink- synchronize with the selected NES cell.
  • the elements/procedures of Figs. 5 and 6 are performed independent of each other.
  • Fig. 6A is a signaling diagram 600A of an example UE 102 in the idle/inactive state that waits for a SIB1 transmission for a configured maximum time period, after transmitting 522/622 an uplink WUS to the network.
  • Elements 502, 504, 512, and 518 have already been described with respect to Fig. 5A.
  • Elements 522 and 524 have already been described with respect to Fig. 5C.
  • the UE 102 receives 616 additional and/or different configuration information than shown in Figs. 5A-5C.
  • the UE 102 receives 616, from a first network entity of the first cell/serving cell 124, system information including a SIB1_monitoring_window.
  • the configuration (e.g., SIB1_monitoring_window) indicates a maximum time duration for monitoring 634-4 for a SIB1 from a particular cell before the UE 102 bars 636-5 the particular cell from a cell reselection procedure 636.
  • UE 102 receives 616 an indication of the maximum duration for SIB1 monitoring via a system information.
  • the UE 102 receives the indication of the maximum duration for SIB1 monitoring via a dedicated RRC message (e.g., RRCRelease or RRConnectionRelease message) while the UE 102 is still in a connected state.
  • a dedicated RRC message e.g., RRCRelease or RRConnectionRelease message
  • the UE 102 performs 518 measurements on the serving cell 124 and multiple NES neighboring cells 128 not transmitting SIB1, including the third cell 128c and a fourth cell 128d.
  • the UE 102 also receives 612 a third SSB with a PBCH indicating that the fourth cell 128d is not transmitting SIB1.
  • the UE 102 determines 620 to reselect to the third cell 128c based on the measurement results.
  • the determination 620 is based on the determination 536C-2 from Fig. 5C. In other examples, the determination 620 is independent of the determination 536C-2 from Fig. 5C. In either case, the UE 102 subsequently transmits 522, to the third network entity of the third cell 128c, the uplink WUS requesting the on-demand SIB1 transmission.
  • the UE 102 monitors 636A-4 for a SIB1 from the third cell 128c during the configured SIB1_monitoring_window. If the UE 102 does not receive the SIB1 from the third cell 128c during the configured SIB1_monitoring_window, the UE 102 bars 636A-5 the third cell 128c from the cell reselection procedure 636 and determines to reselect a different cell. If the UE 102 does receive the SIB1 from the third cell 128c during the configured SIB1_monitoring_window, the UE 102 stops the timer and examines the content of SIB1 to determine whether the UE 102 is restricted from accessing the third cell 128c.
  • the UE 102 reselects and camps on the third cell 128c as the new serving cell. Otherwise, the UE 102 bars the restricted third cell 128c and the UE 102 reselects to another cell and transmits another uplink WUS to the other cell to restart the cell reselection procedure 636A for the other cell.
  • the SIB1 monitoring window timer for the third cell 128c expires without the UE 102 receiving a SIB1 from the third cell 128c during the configured SIB1_monitoring_window. Accordingly, the UE 102 bars 636A-5 the third cell 128c from the cell reselection procedure 636 and determines to reselect to the fourth cell 128d. The UE 102 similarly transmits 622, to the fourth cell 128d, a second uplink WUS requesting an on-demand SIB1 transmission from the fourth cell 128d.
  • the UE 102 If the UE 102 receives 624, from the fourth cell 128d, a second RAR acknowledging the second uplink WUS, the UE 102 restarts 636AA the cell reselection procedure 636A based on the configuration, but this time with respect to the fourth cell 128d rather than the (now barred) third cell 128c.
  • the UE 102 successfully completes the restarted cell reselection procedure 636AA if the UE 102 receives 640, from the fourth cell 128d, an on-demand SIB1 during the configured SIB1_monitoring_window. In such cases, the UE 102 may reselect and downlink-synchronize 638 with the fourth cell/NES neighbor cell 128d.
  • Fig. 6B is similar to Fig. 6A, except that the SIB1_monitoring_window is multiplied by a mobility factor C mobility based on a mobility state of the UE 102.
  • Fig. 6B is a signaling diagram 600B of an example UE 102 in the idle/inactive state that waits for the SIB1 transmission for a configured maximum time period corresponding to a UE mobility state, after transmitting 522/622 an uplink WUS to the network.
  • Elements 502, 504, 512, and 518 have already been described with respect to Fig. 5A.
  • Elements 522 and 524 have already been described with respect to Fig. 5C.
  • Elements 612, 616, 620, 622, 624, 638, and 640 have already been described with respect to Fig. 6A.
  • Elements 636A and 636AA, which both include elements 636A-3, 636A-4, 636A-5, in Fig. 6A are similar to elements 636B and 636BB, which both include elements 636B-3, 636B-4, 636B-5, in Fig. 6B, except that to implement such elements in Fig. 6B the configured SIB1_monitoring_window is multiplied by a mobility factor C mobility based on a mobility/movement of the UE 102.
  • the mobility factor C mobility is a predetermined value associated with the mobility state of the UE 102.
  • the UE 102 determines the mobility factor C mobility based on a current mobility state/condition of the UE 102.
  • a higher UE mobility corresponds to a smaller mobility factor.
  • the mobility factor may be equal to 0.2 when the UE 102 is in a high-mobility state, the mobility factor may be equal to 0.6 when the UE 102 is in a medium-mobility state, and the mobility factor may be equal to 0.8 when the UE 102 is in a low-mobility state.
  • the mobility factor may also be 1.0 when the UE 102 is in a non-mobile (i.e., stationary) state.
  • a mobility factor of 1.0 would provide a similar outcome to that of the steps performed in Fig. 6A.
  • the value of the mobility factor C mobility corresponding to each mobility state is configured by the network, where the UE 102 may receive such configuration through the system information 616 or via a dedicated RRC message (e.g., RRCRelease or RRCConnectionRelease message) while the UE 102 is still in a connected state.
  • a dedicated RRC message e.g., RRCRelease or RRCConnectionRelease message
  • Figs. 5A-6B illustrate signaling diagrams for cell reselection procedures.
  • Figs. 7A-11 show methods for implementing one or more aspects of Figs. 5A-6B.
  • Figs. 7A-8B and 10 shows an implementation by the UE 102 of the one or more aspects of Figs. 5A-6B.
  • Figs. 9 and 11 shows an implementation by the network of the one or more aspects of Figs. 5A-6B.
  • Fig. 7A is a flow diagram 700A of an example method implemented by a UE in the idle/inactive state for determining a cell for cell reselection based on the cell ranking, the SIB1 availability, and the number of qualified beams of the cell.
  • the UE operates 702 in the RRC_IDLE or RRC_INACTIVE state.
  • the UE may have already registered to the network and may be camping on a cell.
  • the UE may receive 704, in system information or in dedicated RRC signaling while the UE was in an RRC_CONNECTED state, a WUS configuration in the cell that the UE is camping on (i.e., the current serving cell) .
  • the UE also receives 716, in the serving cell, system information including a ranking margin (i.e., R nes ) for prioritizing the non-NES cell (i.e., the cell transmitting SIB1) over the NES cell (i.e., the cell not transmitting SIB1) in the cell reselection process.
  • a ranking margin i.e., R nes
  • the UE Based on the cell reselection information/configuration that the UE receives in a SIB2, system information block type 3 (SIB3) , and/or system information block type 4 (SIB4) , the UE performs 718 the measurements on the serving cell and neighboring cells, e.g., based on the signal strength/quality of the serving cell being below a configured threshold.
  • the UE calculates/derives 736-1 a cell ranking value for the serving cell (R s ) and a cell ranking value for each neighboring cell (R n ) , based on the measured RSRP of the cells.
  • the UE After the UE calculates 736-1 the cell ranking values, the UE performs 736-2 a cell reselection procedure based on the cell ranking values.
  • the UE determines 737 whether the highest ranked cell is an NES cell not transmitting SIB1, where the highest ranked cell is the cell having the highest rank (i.e., highest R n or R s ) among the cells operating in the highest-priority frequency.
  • the idle/inactive UE camping on the serving cell is able to obtain the measurement results and calculate/derive the cell ranking values (R n or R s ) for 1 serving cell and 5 neighboring cells, as shown in Table 1.
  • cell 3 is the highest ranked cell in Table 1 even though cell 3 does not have the highest cell ranking value (cell 1 has the highest cell ranking value in the example of Table 1) .
  • Table 1 Example Cell Ranking Table
  • the UE determines whether a cell is transmitting SIB1 through an implicit indication or an explicit indication included in the PBCH transmitted from the cell. If the UE determines 737 that the highest ranked cell is not an NES, the UE reselects 736C-2 the highest ranked cell (i.e., a non-NES cell) . Otherwise, the UE determines 737 whether any non-NES cells (i.e., cells transmitting SIB1) with a rank R n that are within the ranking margin of highest ranked cell R n_BEST , which would be an NES cell not currently transmitting SIB1.
  • any non-NES cells i.e., cells transmitting SIB1 with a rank R n that are within the ranking margin of highest ranked cell R n_BEST , which would be an NES cell not currently transmitting SIB1.
  • the UE determines 739 no non-NES cells with a rank R n are within the ranking margin of R n_BEST . If the UE determines 739 no non-NES cells with a rank R n are within the ranking margin of R n_BEST , the UE reselects 736C-2 the highest ranked cell (i.e., NES cell) . Otherwise, if the UE determines 739 that at least one non-NES cell with a rank R n is within the ranking margin of R n_BEST , the UE determines 741 whether there are multiple non-NES cells with a rank R n within the ranking margin of R n_BEST .
  • the UE determines 741 that there is only one non-NES cell with a rank R n that is within the ranking margin of R n_BEST . Otherwise, if the UE determines 741 that there is more than one non-NES cell with a rank R n within the ranking margin of R n_BEST , the UE reselects 736B-2 the non-NES cell having the highest number of beams above a network configured threshold, among the non-NES cells with the rank R n that are within the ranking margin of R n_BEST .
  • Fig. 7A performs 736B-2 a cell reselection based on a highest number of beams above a network configured threshold
  • Fig. 7B performs 736A-2 a cell reselection based on a highest ranking value.
  • Fig. 7B is a flow diagram 700B of an example method implemented by a UE in the idle/inactive state for determining a cell for cell reselection based on the cell ranking and the SIB1 availability of the cell.
  • Elements 702, 704, 716, 718, 736-1, 736-2, 736C-2, 737, 738b, 739, and 741 have already been described with respect to Fig. 7A.
  • the flow diagram 700B in Fig. 7B is similar to the flow diagram 700A in Fig.
  • Figs. 7A-8B show an implementation by the UE 102 of the one or more aspects of Figs. 5A-5C, whereas Figs. 8A-8B show an implementation by the UE 102 of the one or more aspects of Figs. 6A-6B.
  • Fig. 8A is a flow diagram 800A of an example method implemented by a UE in the idle/inactive state for monitoring the SIB1 transmission for a maximum duration after receiving an acknowledgement for an uplink WUS transmission.
  • Elements 702, 704, and 718 have already been described with respect to Fig. 7A.
  • the UE receives 816, in the serving cell, the system information including a monitoring window length/duration/value for monitoring the transmission of the on-demand SIB1. Based on the measurement results of the serving cell and neighbor cells and the cell reselection criteria, the UE determines 820 to reselect a neighboring cell not transmitting SIB1 due to NES (i.e., providing SIB1 on demand) .
  • the UE transmits 822, in the selected neighboring cell, an uplink WUS to request the transmission of on-demand SIB1.
  • the UE receives 824, in the neighboring cell, an RAR message including a random access preamble identifier (RAPID) corresponding to the uplink WUS transmitted 822 by the UE.
  • RAPID random access preamble identifier
  • the UE starts 863A-3 a timer with a length/duration/value equal to the configured monitoring window length.
  • the UE determines 840 whether the UE received the on-demand SIB1 in the neighboring cell before the timer expired. If the UE receives the on-demand SIB1 in the neighboring cell before the timer expires, the UE reselects 838 the neighboring cell and starts a downlink synchronizing with the neighboring cell, if the received SIB1 indicates that the neighboring cell is not restricted for accessing by the UE.
  • Fig. 8B is similar to Fig. 8A, except that the timer period is multiplied by a mobility factor based on a mobility state of the UE.
  • Fig. 8B is a flow diagram 800B of an example method implemented by a UE in the idle/inactive state for monitoring the SIB1 transmission for a maximum duration corresponding to a UE mobility state, after receiving an acknowledgement for an UL WUS transmission.
  • Elements 702, 704, and 718 have already been described with respect to Fig. 7A.
  • Elements 816, 820, 822, 824, 836-5, 838, and 840 have already been described with respect to Fig. 8A.
  • the UE After determining 820 to reselect a neighboring cell that does not transmit SIB1 due to NES, the UE further determines 850 the UE’s mobility state as being one of the following states: ⁇ Normal-mobility, Medium-mobility, High-mobility ⁇ .
  • the UE start 836B-3 a timer with a length/duration/value equal to [monitoring window length *C UE_MOBILITY_STATE ] , where C UE_MOBILITY_STATE may be a predetermined constant value associated with the mobility state of the UE. A higher UE mobility may correspond to a smaller C UE_MOBILITY_STATE .
  • a value of C UE_MOBILITY_STATE corresponding to each UE mobility state is configured by the network, and the UE receives such configuration information through system information or a dedicated RRC message (e.g., RRCRelease or RRCConnectionRelease message) .
  • Figs. 7A-8B describe a method from a UE-side of a wireless communication link
  • Fig. 9 describes a method from a network-side of the wireless communication link.
  • Fig. 9 is a flow diagram 900 of an example method implemented by a base station for configuring the UE (s) with a cell ranking margin used to prioritize cells transmitting SIB1 over other cells not transmitting SIB1 in the cell reselection procedure, and/or configure the UE (s) with a maximum duration for monitoring the SIB1 transmission after receiving the acknowledgement of the UL WUS transmission.
  • the base station transmits 914, to UE (s) , an uplink WUS configuration.
  • the base station broadcasts the uplink WUS configuration via system information or a dedicated RRC message.
  • the base station may also broadcast or transmit 916-1, to one or more UE (s) , a cell ranking margin for prioritizing the non-NES cells (i.e., the cells transmitting SIB1) over the NES cells (i.e., the cells not transmitting SIB1 due to NES) in the cell reselection procedure.
  • the base station may further broadcast or transmit 916-2, to the one or more UE (s) , a monitoring window length for defining the maximum duration for monitoring the transmission of the on-demand SIB1 from the base station.
  • Fig. 10 illustrates a flowchart 1000 of a method of wireless communication at a UE.
  • the method may be performed by the UE 102.
  • the UE 102 receives 1004 an uplink WUS configuration indicating uplink resources for requesting a SIB1 from a second network entity of a second cell.
  • the UE 102 receives 504, from the first cell 124, the uplink WUS configuration.
  • the UE 102 receives 1016, from a first network entity of a first cell, a configuration for reselection to a highest ranked cell including deactivated SIB1 transmissions when other non-highest ranked cells including activated SIB1 transmissions are outside of a ranking margin. For example, referring to Figs. 5A-5C, the UE 102 receives 516, from the first cell 124, the SIB2 including the rangeToBestCell-NES (R nes ) . Referring to Figs. 6A-6B, the UE 102 receives 616, from the first cell 124, system information including the SIB1_monitoring_window.
  • the UE 102 performs 1036, based on the configuration, a procedure for reselection to the second cell. For example, referring to Figs. 5A-5C, the UE 102 performs the procedures 536A-536C based on a cell ranking margin. Referring to Figs. 6A-6B, the UE 102 performs the procedures 636A-636B based on a SIB1_monitoring_window timer.
  • the UE 102 communicates 1022/1038 with a second network entity of the second cell based on an outcome of the procedure. For example, referring to Figs. 5A-5B, the UE 102 communicates with the second cell 128b via 538b-540b based on an outcome of the procedures 536A-536B. Referring to Fig. 5C, the UE 102 communicates with the third cell 128c via 522-538c based on an outcome of the procedure 536C. Referring to Figs. 6A-6B, the UE 102 communicates with the fourth cell 128d via 622-638 based on an outcome of the procedures 636A-636B.
  • the UE 102 reselects 1038b the second cell from the non-highest ranked cells based on the second cell having the second RSRP value within the ranking margin. For example, referring to Figs. 5A-5B, the UE 102 reselects and downlink synchronizes 538b with the second cell 128b.
  • the UE 102 reselects 1038c to the highest ranked cell including the deactivated SIB1 transmissions based on the RSRP values of the non-highest ranked cells being outside of the ranking margin. For example, referring to Fig. 5C, the UE 102 reselects and downlink synchronizes 538c with the second cell 128c.
  • the UE 102 transmits 1022-1, to the highest ranked cell, a first uplink WUS requesting a SIB1 from the highest ranked cell. For example, referring to Figs. 5C-6B, the UE 102 transmits 522, to the third cell 128c, the uplink WUS requesting the on-demand SIB1.
  • the UE 102 receives 1024, from the highest ranked cell, a RAR message to the first uplink WUS. For example, referring to Figs. 5C-6B, the UE 102 receives 524, from the third cell 128c, a random access response message to the uplink WUS.
  • the UE 102 initiates 1036-3, after receiving the RAR message, a timer including a monitoring time value for a SIB1 monitoring time window. For example, referring to Figs. 6A-6B, the UE 102 starts 636-3 the SIB1_monitoring_window timer for the SIB1_monitoring_window 636-4.
  • the UE 102 monitors 1036-4 for the SIB1 from the second network entity during the SIB1 monitoring time window. For example, referring to Figs. 6A-6B, the UE 102 monitors for the SIB1 during the SIB1_monitoring_window 636-4. In Fig. 6, the SIB1_monitoring_window 636B-4 is multiplied by a mobility factor based on a mobility of the UE 102.
  • the UE 102 bars 1036-5 based on an expiration of the timer, the highest ranked cell from the procedure for the reselection to the second cell. For example, referring to Figs. 6A-6B, the UE 102 bars 636-5 the second cell 128c from the procedure 636 for cell reselection.
  • the UE 102 transmits 1022-2, to a network entity of a next highest ranked cell with deactivated SIB1 transmissions, a second uplink WUS requesting the SIB1 from the next highest ranked cell. For example, referring to Figs. 6A-6B, the UE 102 transmits 622 an uplink WUS requesting on-demand SIB1 transmission from the fourth cell 128d.
  • Fig. 10 describes a method from a UE-side of a wireless communication link
  • Fig. 11 describes a method from a network-side of the wireless communication link.
  • Fig. 11 is a flowchart 1100 of a method of wireless communication at a network entity of a first cell 124 (e.g., current serving cell) .
  • the method may be performed by one or more network entities 104 of the first cell 124.
  • the first network entity 104 of the first cell 124 transmits 1104, to a UE, an uplink WUS configuration indicating uplink resources for requesting a SIB1 from a second network entity of a second cell.
  • the first network entity of the first cell 124 transmits 504, to the UE 102, the uplink WUS configuration.
  • the first network entity 104 of the first cell 124 transmits 1116, to the UE, a configuration for reselection to a highest ranked cell including deactivated SIB1 transmissions when other non-highest ranked cells including activated SIB1 transmissions are outside of a ranking margin-the ranking margin is a relative RSRP or ranking value from a first RSRP or ranking value of the highest ranked cell.
  • the first network entity of the first cell 124 transmits 516, to the UE 102, the SIB2 including the rangeToBestCell-NES (R nes ) . Referring to Figs.
  • the first network entity of the first cell 124 transmits 616, to the UE 102, system information including the SIB1_monitoring_window.
  • a UE apparatus 1202 as described in Fig. 12, may perform the method of flowchart 1000.
  • the one or more network entities 104 of the first cell 124, as described in Fig. 13, may perform the method of flowchart 1100.
  • Fig. 12 is a diagram 1200 illustrating an example of a hardware implementation for a UE apparatus 1202.
  • the UE apparatus 1202 may be the UE 102, a component of the UE 102, or may implement UE functionality.
  • the UE apparatus 1202 may include an application processor 1206, which may have on-chip memory 1206’.
  • the application processor 1206 may be coupled to a secure digital (SD) card 1208 and/or a display 1210.
  • the application processor 1206 may also be coupled to a sensor (s) module 1212, a power supply 1214, an additional module of memory 1216, a camera 1218, and/or other related components.
  • SD secure digital
  • the application processor 1206 may also be coupled to a sensor (s) module 1212, a power supply 1214, an additional module of memory 1216, a camera 1218, and/or other related components.
  • the UE apparatus 1202 may further include a wireless baseband processor 1226, which may be referred to as a modem.
  • the wireless baseband processor 1226 may have on-chip memory 1226'.
  • the wireless baseband processor 1226 may also be coupled to the sensor (s) module 1212, the power supply 1214, the additional module of memory 1216, the camera 1218, and/or other related components.
  • the wireless baseband processor 1226 may be additionally coupled to one or more subscriber identity module (SIM) card (s) 1220 and/or one or more transceivers 1230 (e.g., wireless RF transceivers) .
  • SIM subscriber identity module
  • the UE apparatus 1202 may include a Bluetooth module 1232, a WLAN module 1234, an SPS module 1236 (e.g., GNSS module) , and/or a cellular module 1238.
  • the Bluetooth module 1232, the WLAN module 1234, the SPS module 1236, and the cellular module 1238 may each include an on-chip transceiver (TRX) , or in some cases, just a transmitter (TX) or just a receiver (RX) .
  • TRX on-chip transceiver
  • the Bluetooth module 1232, the WLAN module 1234, the SPS module 1236, and the cellular module 1238 may each include dedicated antennas and/or utilize antennas 1240 for communication with one or more other nodes.
  • the UE apparatus 1202 can communicate through the transceiver (s) 1230 via the antennas 1240 with another UE (e.g., sidelink communication) and/or with a network entity 104 (e.g., uplink/downlink communication) , where the network entity 104 may correspond to a base station or a unit of the base station, such as the RU 176, the DU 174, or the CU 172.
  • another UE e.g., sidelink communication
  • a network entity 104 e.g., uplink/downlink communication
  • the network entity 104 may correspond to a base station or a unit of the base station, such as the RU 176, the DU 174, or the CU 172.
  • the wireless baseband processor 1226 and the application processor 1206 may each include a computer-readable medium /memory 1226', 1206', respectively.
  • the additional module of memory 1216 may also be considered a computer-readable medium /memory.
  • Each computer-readable medium /memory 1226', 1206', 1216 may be non-transitory.
  • the wireless baseband processor 1226 and the application processor 1206 may each be responsible for general processing, including execution of software stored on the computer-readable medium /memory 1226', 1206', 1216.
  • the software when executed by the wireless baseband processor 1226 /application processor 1206, causes the wireless baseband processor 1226 /application processor 1206 to perform the various functions described herein.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the wireless baseband processor 1226 /application processor 1206 when executing the software.
  • the wireless baseband processor 1226 /application processor 1206 may be a component of the UE 102.
  • the UE apparatus 1202 may be a processor chip (e.g., modem and/or application) and include just the wireless baseband processor 1226 and/or the application processor 1206. In other examples, the UE apparatus 1202 may be the entire UE 102 and include the additional modules of the apparatus 1202.
  • the cell reselection component 141 is configured to receive, from a first network entity of a first cell, a configuration for reselection to a highest ranked cell including deactivated SIB1 transmissions when other non-highest ranked cells including activated SIB1 transmissions are outside of a ranking margin, the ranking margin being a relative RSRP value from a first RSRP value of the highest ranked cell; perform, based on the configuration, a procedure for reselection to a second cell; and communicate with a second network entity of the second cell based on an outcome of the procedure.
  • the cell reselection component 141 may be within the wireless baseband processor 1226.
  • the cell reselection component 141 may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by the one or more processors, or a combination thereof.
  • Fig. 13 is a diagram 1300 illustrating an example of a hardware implementation for one or more network entities 104/106.
  • the one or more network entities 104/106 may be a base station, a component of a base station, or may implement base station functionality.
  • the one or more network entities 104/106 may include, or may correspond to, at least one of the RU 176, the DU, 174, or the CU 172.
  • the CU 172 may include a CU processor 1346, which may have on-chip memory 1346'.
  • the CU 172 may further include an additional module of memory 1356 and/or a communications interface 1348, both of which may be coupled to the CU processor 1346.
  • the CU 172 can communicate with the DU 174 through a midhaul link 163, such as an F1 interface between the communications interface 1348 of the CU 172 and a communications interface 1328 of the DU 174.
  • the DU 174 may include a DU processor 1326, which may have on-chip memory 1326'. In some aspects, the DU 174 may further include an additional module of memory 1336 and/or the communications interface 1328, both of which may be coupled to the DU processor 1326.
  • the DU 174 can communicate with the RU 176 through a fronthaul link 161 between the communications interface 1328 of the DU 174 and a communications interface 1308 of the RU 176.
  • the RU 176 may include an RU processor 1306, which may have on-chip memory 1306'. In some aspects, the RU 176 may further include an additional module of memory 1316, the communications interface 1308, and one or more transceivers 1330, all of which may be coupled to the RU processor 1306. The RU 176 may further include antennas 1340, which may be coupled to the one or more transceivers 1330, such that the RU 176 can communicate through the one or more transceivers 1330 via the antennas 1340 with the UE 102.
  • the on-chip memory 1306', 1326', 1346' and the additional modules of memory 1316, 1336, 1356 may each be considered a computer-readable medium /memory. Each computer-readable medium /memory may be non-transitory. Each of the processors 1306, 1326, 1346 is responsible for general processing, including execution of software stored on the computer-readable medium /memory. The software, when executed by the corresponding processor (s) 1306, 1326, 1346 causes the processor (s) 1306, 1326, 1346 to perform the various functions described herein.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the processor (s) 1306, 1326, 1346 when executing the software.
  • the configuration component 151 may sit at any of the one or more network entities 104/106, such as at the CU 172; both the CU 172 and the DU 174; each of the CU 172, the DU 174, and the RU 176; the DU 174; both the DU 174 and the RU 176; or the RU 176.
  • the configuration component 151 is configured to transmit, to a UE, an uplink WUS configuration indicating uplink resources for requesting a SIB1 from a second network entity of a second cell; and transmit, to the UE, a configuration for reselection to a highest ranked cell including deactivated SIB1 transmissions when other non-highest ranked cells including activated SIB1 transmissions are outside of a ranking margin, the ranking margin being a relative RSRP value from a first RSRP value of the highest ranked cell.
  • the configuration component 151 may be within one or more processors of the one or more network entities 104/106, such as the RU processor 1306 (e.g., at 151a) and/or the DU processor 1326 (e.g., at 151b) .
  • the configuration component 151a-151b may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors 1306, 1326, 1346 configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by the one or more processors 1306, 1326, 1346, or a combination thereof.
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems-on-chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other similar hardware configured to perform the various functionality described throughout this disclosure.
  • GPUs graphics processing units
  • CPUs central processing units
  • DSPs digital signal processors
  • RISC reduced instruction set computing
  • SoC systems-on-chip
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • One or more processors in the processing system may execute software, which may be referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.
  • Computer-readable media includes computer storage media and can include a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • Storage media may be any available media that can be accessed by a computer.
  • aspects, implementations, and/or use cases described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements.
  • the aspects, implementations, and/or use cases may come about via integrated chip implementations and other non-module-component based devices, such as end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (AI) -enabled devices, machine learning (ML) -enabled devices, etc.
  • the aspects, implementations, and/or use cases may range from chip-level or modular components to non-modular or non-chip-level implementations, and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more techniques described herein.
  • OEM original equipment manufacturer
  • Devices incorporating the aspects and features described herein may also include additional components and features for the implementation and practice of the claimed and described aspects and features.
  • transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes, such as hardware components, antennas, RF-chains, power amplifiers, modulators, buffers, processor (s) , interleavers, adders/summers, etc.
  • Techniques described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc., of varying configurations.
  • “may” refers to a permissible feature that may or may not occur
  • “might” refers to a feature that probably occurs
  • “can” refers to a capability (e.g., capable of) .
  • the phrase “For example” often carries a similar connotation to “may” and, therefore, “may” is sometimes excluded from sentences that include “for example” or other similar phrases.
  • the term “some” refers to one or more.
  • Sets should be interpreted as a set of elements where the elements number one or more.
  • Terms or articles such as “a” , “an” , and/or “the” may refer to one of an item, feature, element, etc., that the term or article precedes, or may refer to more than one of said item, feature, element, etc. that the term or article precedes.
  • the recitation “awidget” does not preclude reference to multiples of said widget, as “multiple widgets” necessarily includes “awidget” .
  • the recitation “awidget” may be interpreted as “at least one widget” or, similarly, interpreted as “one or more widgets” .
  • ordinal terms such as “first” and “second” do not necessarily imply an order in time, sequence, numerical value, etc., but are used to distinguish between different instances of a term or phrase that follows each ordinal term.
  • Example 1 is a method of wireless communication at a UE, including: receiving, from a first network entity of a first cell, a configuration for reselection to a highest ranked cell including deactivated SIB1 transmissions when other non-highest ranked cells including activated SIB1 transmissions are outside of a ranking margin, the ranking margin being a relative RSRP value from a first RSRP value of the highest ranked cell; performing, based on the configuration, a procedure for reselection to a second cell; and communicating with a second network entity of the second cell based on an outcome of the procedure.
  • Example 2 may be combined with Example 1 and includes that the receiving the configuration further includes: receiving a first indication of the ranking margin that is the relative RSRP value permitting reselection to a non-highest ranked cell when a second RSRP value of the non-highest ranked cell is greater than the first RSRP value of the highest ranked cell minus the ranking margin.
  • Example 3 may be combined with Example 2 and includes that the receiving the configuration further includes: receiving a second indication for the reselection to the non-highest ranked cell based on the non-highest ranked cell having a greater number of beams above a threshold quality than the first cell.
  • Example 4 may be combined with any of Examples 2-3 and includes that the second RSRP value is within the ranking margin, further comprising: reselecting the second cell from the non-highest ranked cells based on the second cell having the second RSRP value within the ranking margin.
  • Example 5 may be combined with Example 4 and includes that the reselecting the second cell is based on an RSRP value of the second cell being a highest RSRP value of the non-highest ranking cells.
  • Example 6 may be combined with Example 4 and includes that the reselecting the second cell is based on the second cell having the greater number of beams above the threshold quality than the first cell.
  • Example 7 may be combined with Example 6 and includes that the reselecting the second cell is based on the second cell having a highest number of beams above the threshold quality among the non-highest ranked cells.
  • Example 8 may be combined with any of Examples 1-3 and includes that RSRP values of the non-highest ranked cells are outside of the ranking margin, further including: reselecting the highest ranked cell including the deactivated SIB1 transmissions based on the RSRP values of the non-highest ranked cells being outside of the ranking margin.
  • Example 9 may be combined with Example 8 and includes that the receiving the configuration further includes: receiving a third indication of a monitoring time value for a SIB1 monitoring time window to receive a SIB1.
  • Example 10 may be combined with any of Examples 8-9 and further including transmitting, to the highest ranked cell, a first uplink WUS requesting a SIB1 from the highest ranked cell.
  • Example 11 may be combined with Example 10 and further including receiving, from the highest ranked cell, a RAR message to the first uplink WUS.
  • Example 12 may be combined with any of Examples 10-11 and further including initiating, after the transmitting the first uplink WUS, a timer including the monitoring time value for the SIB1 monitoring time window; and monitoring for the SIB1 from the second network entity during the SIB1 monitoring time window.
  • Example 13 may be combined with Example 12 and includes that an expiration of the timer occurs prior to receiving the SIB1 from the second network entity, further including: barring, based on the expiration of the timer, the highest ranked cell from the procedure for the reselection to the second cell; and transmitting, to a third network entity of a next highest ranked cell with deactivated SIB1 transmissions, a second uplink WUS requesting the SIB1 from the next highest ranked cell.
  • Example 14 may be combined with any of Examples 9-13 and includes that the monitoring time value for the SIB1 monitoring time window is multiplied by a mobility factor, the mobility factor being based on a current mobility state of the UE.
  • Example 15 is a method of wireless communication at a first network entity of a first cell, including: transmitting, to a UE, an uplink WUS configuration indicating uplink resources for requesting a SIB1 from a second network entity of a second cell; and transmitting, to the UE, a configuration for reselection to a highest ranked cell including deactivated SIB1 transmissions when other non-highest ranked cells including activated SIB1 transmissions are outside of a ranking margin, the ranking margin being a relative RSRP value from a first RSRP value of the highest ranked cell.
  • Example 16 may be combined with Example 15 and includes that the transmitting the configuration further includes: transmitting, to the UE, a first indication of the ranking margin that is the relative RSRP value permitting reselection to a non-highest ranking cell when a second RSRP value of the non-highest ranked cell is greater than the first RSRP value of the highest ranked cell minus the ranking margin.
  • Example 17 may be combined with Example 16 and includes that the transmitting the configuration further includes: transmitting, to the UE, a second indication for the reselection to the non-highest ranked cell based on the non-highest ranked cell having a greater number of beams above a threshold quality than the first cell.
  • Example 18 may be combined with any of Examples 15-17 and includes that the transmitting the configuration further includes: transmitting, to the UE, a third indication of a monitoring time value for a SIB1 monitoring time window for receiving a SIB1.
  • Example 19 is an apparatus for wireless communication for implementing a method as in any of Examples 1-18.
  • Example 20 is an apparatus for wireless communication including means for implementing a method as in any of Examples 1-18.
  • Example 21 is a non-transitory computer-readable medium storing computer executable code, the code when executed by a processor causes the processor to implement a method as in any of Examples 1-18.

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

Abstract

La présente divulgation concerne des systèmes, des dispositifs, un appareil et des procédés, y compris des programmes informatiques codés sur des supports de stockage, pour la resélection de cellules fonctionnant dans un mode NES. Un UE (102) reçoit (516), en provenance d'une première entité de réseau d'une première cellule (124), une configuration pour la resélection vers la cellule la mieux classée (128c) comprenant des transmissions SIB1 désactivées lorsque d'autres cellules non les mieux classées (128b) comprenant des transmissions SIB1 activées se trouvent en dehors d'une marge de classement. La marge de classement est une valeur relative (RSRP) à partir d'une première valeur RSRP de la cellule la mieux classée (128c). L'UE (102) effectue (536), sur la base de la configuration, une procédure de resélection vers une seconde cellule (128). L'UE (102) communique (538) avec une seconde entité de réseau de la seconde cellule (128) sur la base d'un résultat de la procédure.
PCT/CN2024/110623 2024-08-08 2024-08-08 Procédés de resélection de cellules fonctionnant dans un mode d'économie d'énergie de réseau Pending WO2026031047A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190394691A1 (en) * 2018-06-21 2019-12-26 FG Innovation Company Limited Method and apparatus for performing cell (re)selection in wireless communication system
WO2024055298A1 (fr) * 2022-09-16 2024-03-21 Apple Inc. Technologies de sélection et de resélection de cellule dans des réseaux d'économie d'énergie de réseau

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US20190394691A1 (en) * 2018-06-21 2019-12-26 FG Innovation Company Limited Method and apparatus for performing cell (re)selection in wireless communication system
WO2024055298A1 (fr) * 2022-09-16 2024-03-21 Apple Inc. Technologies de sélection et de resélection de cellule dans des réseaux d'économie d'énergie de réseau

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SHUKUN WANG ET AL: "Discussion on on-demand SIB1", vol. RAN WG2, no. Fukuoka City, Fukuoka, JP; 20240520 - 20240524, 10 May 2024 (2024-05-10), XP052606613, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/TSG_RAN/WG2_RL2/TSGR2_126/Docs/R2-2404153.zip R2-2404153 Discussion on on-demand SIB1 v2.0.doc> [retrieved on 20240510] *
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