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WO2025209722A1 - Procédures de mobilité pour cellules à sib1 à la demande - Google Patents

Procédures de mobilité pour cellules à sib1 à la demande

Info

Publication number
WO2025209722A1
WO2025209722A1 PCT/EP2025/054859 EP2025054859W WO2025209722A1 WO 2025209722 A1 WO2025209722 A1 WO 2025209722A1 EP 2025054859 W EP2025054859 W EP 2025054859W WO 2025209722 A1 WO2025209722 A1 WO 2025209722A1
Authority
WO
WIPO (PCT)
Prior art keywords
cell
demand
sib1
reselection priority
sib
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/EP2025/054859
Other languages
English (en)
Inventor
Mads LAURIDSEN
Daniela Laselva
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Technologies Oy
Original Assignee
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Publication of WO2025209722A1 publication Critical patent/WO2025209722A1/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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • Minimum SI relates to information relating to master information block (MIB) and system information block 1 (SIB 1).
  • MIB master information block
  • SIB1 system information block 1
  • a method performed by a user equipment, UE, supporting on-demand system information block 1, SIB1, mode operation and being served by a first cell supports switching towards a second cell operating in an on-demand SIB1 mode and comprises receiving from the first cell an indication of an on-demand SIB1 cell reselection priority associated with a frequency band deployed by the second cell, wherein the on-demand SIB1 reselection priority is higher than the reselection priority associated with the frequency band deployed by the first cell, performing measurements with respect to the frequency band deployed by the second cell based on the on-demand SIB 1 reselection priority, and determining to switch towards the second cell based on results of the measurements.
  • the method comprises transmitting an indication of an on-demand SIB1 cell reselection priority associated with a frequency band deployed by the second cell to the UE, wherein the on-demand SIB1 reselection priority is higher than the reselection priority associated with the frequency band deployed by the first cell, wherein the indication triggers, at the UE, measurements with respect to the frequency band deployed by the second cell based on the on-demand SIB1 reselection priority and a determination to switch towards the second cell based on results of the measurements.
  • an apparatus of a first cell in a mobile communication system supporting switching of a user equipment, UE, towards a second cell operating in an on-demand system information block 1, SIB1, mode, wherein the UE is supporting on-demand SIB1 mode operation and being served by the first cell, is provided.
  • the apparatus is configured to transmit an indication of an on-demand SIB1 cell reselection priority associated with a frequency band deployed by the second cell to the UE, wherein the on-demand SIB1 reselection priority is higher than the reselection priority associated with the frequency band deployed by the first cell, wherein the indication triggers, at the UE, measurements with respect to the frequency band deployed by the second cell based on the on-demand SIB1 reselection priority and a determination to switchs towards the second cell based on results of the measurements.
  • the UE is in in radio resource control, RRC, idle or inactive mode and camping on the first cell, wherein switching towards the second cell comprises cell reselection towards the second cell.
  • the UE is in radio resource control, RRC, connected mode while receiving the indication of the on- demand SIB1 cell reselection priority and in RRC idle or inactive mode when performing measurements and determining to switch towards the second cell, wherein switching towards the second cell comprises cell reselection towards the second cell.
  • the on-demand SIB 1 cell reselection priority of the second cell is different from a cell reselection priority of the second cell when not operating in SIB1 on-demand mode.
  • the indication of the on-demand SIB1 cell reselection priority is included in an on-demand SIB1 configuration message for the second cell.
  • the on-demand SIB1 configuration message comprises the on-demand SIB1 cell reselection priority and at least one of a Physical Cell ID, PCI, of the second cell and the frequency band deployed by the second cell.
  • the on-demand SIB1 configuration message further comprises an indication regarding the applicability of the on-demand SIB1 cell reselection priority.
  • the indication regarding the applicability of the on-demand SIB1 cell reselection priority indicates applicability to the PCI of the second cell and/or the frequency band deployed by the second cell.
  • the on-demand SIB1 configuration message comprises a Physical Cell ID, PCI, of the second cell and the frequency band deployed by the second cell, and wherein receiving the on-demand SIB1 configuration message is an implicit instruction to the UE to perform the measurements.
  • the indication of the on-demand SIB1 cell reselection priority is included in a system information block, SIB, message including the on-demand SIB1 cell reselection priority.
  • the SIB message comprises one or more SIB2 and/or SIB4 information elements defining the on-demand SIB1 cell reselection priority.
  • the SIB message further comprises one or more SIB2 and/or SIB4 information elements defining a cell reselection priority for the second cell when not operating in SIB1 on-demand mode.
  • the measurements triggered at the UE are cell reselection measurements concerning at least one of radio power and transmission quality of the second cell.
  • the determination to switch towards the second cell is further based on whether the second cell operates in on-demand SIB1 mode or not
  • FIG. 2 shows a schematic diagram of an example wireless device
  • FIG. 10 depicts a message flow diagram of providing the on-demand SIB1 cell reselection priority explicitly within an on-demand SIB1 configuration message according to the disclosure.
  • FIG. 12 depicts a message flow diagram of providing the on-demand SIB1 cell reselection priority within another SIB message according to the disclosure.
  • references in the specification to "one embodiment,” “an embodiment,” “an example embodiment,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to implement such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • plural means two or more.
  • a “set” of items may include one or more of such items.
  • the terms “comprising”, “including”, “carrying”, “having”, “containing”, “involving”, and the like are to be understood to be open-ended, i.e., to mean including but not limited to. Only the transitional phrases “consisting of and “consisting essentially of, respectively, are closed or semi-closed transitional phrases with respect to claims.
  • FIG. 1 illustrates an example of a wireless network 100 that may be used for wireless communications.
  • Wireless network 100 includes wireless devices, such as UEs 110 (e.g., 110A-110B), and network nodes, such as radio access nodes 120 (e.g., 120A-120B) (e.g., eNBs, gNBs, etc.), connected to one or more network nodes 130 over an interconnecting network 125.
  • the network 100 may use any suitable deployment scenarios.
  • UEs 110 within coverage area 115 may each be capable of communicating directly with radio access nodes 120 over a wireless or air interface. In some embodiments, UEs 110 may also be capable of communicating with each other via D2D communication.
  • UE 110A may communicate with radio access node 120A over a wireless or air interface. That is, UE 110A may transmit wireless signals to and/or receive wireless signals from radio access node 120A.
  • the wireless signals may contain voice traffic, data traffic, control signals, and/or any other suitable information.
  • UE user equipment
  • UE user equipment
  • Examples of UE are target device, D2D UE, machine type UE or UE capable of machine-to- machine (M2M) communication, personal digital assistant, tablet, mobile terminal, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, ProSe UE, vehicle-to-vehicle (V2V) UE, V2X UE, MTC UE, eMTC UE, FeMTC UE, UE Cat 0, UE Cat Ml, narrow band loT (NB-IoT) UE, UE Cat NB1, etc.
  • Example embodiments of a UE are described in more detail below with respect to FIG. 2.
  • the radio access node 120 may transmit a beamformed signal to the UE 110 in one or more transmit directions (transmission beam, Tx beam).
  • the UE 110 may receive the beamformed signal from the base station 120 in one or more receive directions (reception beam, Rx beam).
  • the UE 110 may also transmit a beamformed signal to the base station 120 in one or more directions and the base station 120 may receive the beamformed signal from the UE 110 in one or more directions.
  • the base station 120 and the UE 110 may determine the best receive and transmit directions, e.g., best in the sense of these directions leading to the highest link quality or fulfilling other quality conditions in the most suitable manner, for each of the base station/UE pairs.
  • the transceiver 210 facilitates transmitting wireless signals to and receiving wireless signals from radio access node 120 (e.g., via transmitter(s) (Tx), receiver(s) (Rx) and antenna(s)).
  • the processor 220 executes instructions to provide some or all of the functionalities described herein as being provided by UE 110, and the memory 230 stores the instructions executed by the processor 220.
  • the processor 220 and the memory 230 form processing circuitry.
  • the processor 220 may include any suitable combination of hardware to execute instructions and manipulate data to perform some or all of the described functions of UE 110 described herein.
  • the processor 220 may include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more application specific integrated circuits (ASICs), one or more field programmable gate arrays (FPGAs) and/or other logic.
  • CPUs central processing units
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • the memory 230 is generally operable to store instructions, such as a computer program, software, an application including one or more of logic, rules, algorithms, code, tables, etc. and/or other instructions capable of being executed by a processor 220.
  • Examples of memory 230 include computer memory (for example, Random Access Memory (RAM) or Read Only Memory (ROM)), mass storage media (for example, a hard disk), removable storage media (for example, a Compact Disk (CD) or a Digital Video Disk (DVD)), and/or or any other volatile or non-volatile, non- transitory computer-readable and/or computer-executable memory devices that store information, data, and/or instructions that may be used by the processor 220 of UE 110.
  • the memory 230 includes computer program code causing the processor 220 to perform processing according to the methods described herein, e.g., the method of FIG. 5.
  • the network interface 240 is communicatively coupled to the processor 220 and may refer to any suitable device operable to receive input for UE 110, send output from UE 110, perform suitable processing of the input or output or both, communicate to other devices, or any combination thereof.
  • the network interface 240 may include appropriate hardware (e.g., port, modem, network interface card, etc.) and software, including protocol conversion and data processing capabilities, to communicate through a network.
  • the wireless device UE 110 may comprise a series of modules configured to implement the functionalities of the wireless device described herein. Moreover, in some embodiments, the UE 110 may also comprise means for the functionalities described herein.
  • modules may be implemented as combination of hardware and software, for instance, the processor, memory, and transceiver(s) of UE 110 shown in FIG. 2. Some embodiments may also include additional modules to support additional and/or optional functionalities.
  • FIG. 3 is a schematic diagram of an example of an apparatus for a radio access node 120 or network node 130.
  • the apparatus may comprise at least one processor 220 and at least memory 230 storing computer program instructions that, when executed by the at least one processor 220, cause the apparatus to carry out the embodiments of the network node 130 or radio access node 120 described herein.
  • the example radio access node 120 or network node 130 may include one or more of a transceiver 310, processor 320, memory 330, and network interface 340.
  • the processor 320 may include any suitable combination of hardware to execute instructions and manipulate data to perform some or all of the described functions of the radio access node 120 or the network node 130, such as those described herein.
  • the processor 320 may include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more application specific integrated circuits (ASICs), one or more field programmable gate arrays (FPGAs) and/or other logic.
  • CPUs central processing units
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • the memory 330 is generally operable to store instructions, such as a computer program, software, an application including one or more of logic, rules, algorithms, code, tables, etc. and/or other instructions capable of being executed by a processor 320.
  • Examples of memory 330 include computer memory (for example, Random Access Memory (RAM) or Read Only Memory (ROM)), mass storage media (for example, a hard disk), removable storage media (for example, a Compact Disk (CD) or a Digital Video Disk (DVD)), and/or or any other volatile or non-volatile, non- transitory computer-readable and/or computer-executable memory devices that store information.
  • the memory 330 includes computer program code causing the processor 320 to perform processing according to the methods described herein, e.g., the method of FIG. 6.
  • the network interface 340 is communicatively coupled to the processor 320 and may refer to any suitable device operable to receive input for the radio access node 120 or the network node 130, send output from the radio access node 120 or the network node 130, perform suitable processing of the input or output or both, communicate to other devices, or any combination of the preceding.
  • the network interface 340 may include appropriate hardware (e.g., port, modem, network interface card, etc.) and software, including protocol conversion and data processing capabilities, to communicate through a network.
  • radio access node 120 or the network node 130 may include additional components beyond those shown in FIG. 3 that may be responsible for providing certain aspects of the node’s functionalities, including any of the functionalities described herein and/or any additional functionalities (including any functionality necessary to support the solutions described herein).
  • the various different types of radio access nodes or network nodes may include components having the same physical hardware but configured (e.g., via programming) to support different radio access technologies, or may represent partly or entirely different physical components.
  • Processors, interfaces, and memory similar to those described with respect to FIG. 3 may be included in other nodes (such as UE 110, radio access node 120, etc.).
  • Other nodes may optionally include or not include a wireless interface (such as the transceiver described in FIG. 3).
  • the radio access node 120 or the network node 130 may comprise a series of modules configured to implement the functionalities of the radio access node 120 or the network node 130 described herein. Moreover, in some embodiments, the radio access node 120 or the network node 130 may also comprise means for the functionalities described herein.
  • modules may be implemented as combination of hardware and software, for instance, the processor, memory, and transceiver(s) of the radio access node 120 or the network node 130 shown in FIG. 3. Some embodiments may also include additional modules to support additional and/or optional functionalities.
  • a further enhancement of NES is to also provide SIB1 only on demand. This requires new processes, information elements, messages, etc. to be defined in new standard releases.
  • legacy UE i.e., UEs not supporting the new features of on-demand SIB1 mode operation, will not be able, e.g., to switch to cells operating in on-demand SIB1 mode because they are not able to obtain SIB1 of these cells.
  • UEs supporting on-demand SIB1 mode operation should be able to switch to those cells operating in on-demand SIB1 mode.
  • the on-demand SIB1 transmission may be triggered by the on- demand SIB1 request from a UE, which may be similar to the on-demand SIB request for other SIBs based on physical random access channel (PRACH) in legacy specifications, e.g., as defined in 3GPP TS 38.331 Release 17 or 18.
  • PRACH physical random access channel
  • the configuration of the WUS/on-demand SIB1 request is provided by the network (NW), preferably, by the coverage cell.
  • Case-B Non-co-located anchor and non-anchor cell in different gNBs, e.g., in gNB 120 A and gNB 120B as described with respect to FIG. 1, where the information exchange between the two cells is via a backhaul interface, i.e. an Xn interface.
  • the RUs of anchor and non-anchor cells are physically non-located.
  • Scenario 1 The backhaul signaling of on-demand SIB1 request/WUS configuration may be exchanged between anchor cells 120-2 and non-anchor cells 120-1 (via backhaul for non-co-located case or via internal interface for collocated case).
  • the anchor cell 120-2 may handle the on-demand SIB1 request configuration, herein also denoted as configuration information, to the RRC IDLE/RRC INACTIVE UEs as well as the on-demand SIB1 request reception from the RRC IDLE/RRC INACTIVE UEs.
  • the anchor cell 120- 2 may also handle the delivery of on-demand non-anchor cell SIB1 to the RRC IDLE/RRC INACTIVE UEs based on the exchanged information via backhauling.
  • the non-anchor cell 120-1 could achieve the best network side energy saving performance because of the only network side energy consumption is for information exchange of backhauling. This case does not require UE 110 switching between anchor cell 120-2 and non-anchor cell 120-1 for acquiring the on-demand SIB1.
  • Scenario-2 The anchor cell 120-2 may trigger the non-anchor cell 120-1 to send the on-demand SIB1 by non-anchor cell 120-1 itself.
  • the anchor cell 120-2 may then handle the transmission of on-demand SIB1 request configuration to the RRC IDLE/RRC IN ACTIVE UEs as well as the on-demand SIB1 request reception from the RRC IDLE/RRC INACTIVE UEs. This case requires UE 110 switching between anchor cell 120-2 and non-anchor cell 120-1 for acquiring the on-demand SIB1 since the non-anchor cell's SIB1 is transmitted from the non-anchor cell 120-1 itself.
  • Scenario-3 The anchor cell 120-2 only handles the on-demand configuration to the RRC IDLE/RRC INACTIVE UEs, e.g. the information of on-demand SIB1 request configuration may be exchanged via backhauling beforehand for non-collocated case. And the non-anchor cell 120-1 may then handle the on-demand reception from the RRC IDLE/RRC INACTIVE UEs as well as the transmission of on-demand SIB1 by itself. This case requires the non-anchor cell 120-1 to monitor for on-demand SIB1 request /WUS reception, which increases the energy consumption for non-anchor cell 120-1 compared to scenarios 1 and 2. This case requires UE 110 switching between anchor cell 120-2 and non- anchor cell 120-1 for acquiring the on-demand SIB1.
  • Scenario-4 The operation of on-demand SIB1 is independent from the anchor cell 120-2.
  • the non-anchor cell 120-1 may handle the on-demand SIB1 request configuration to the RRC IDLE/RRC INACTIVE UEs as well as the on-demand SIB1 request reception from the RRC IDLE/RRC INACTIVE UEs.
  • the non-anchor cell 120-1 will also handle the delivery of on-demand SIB1 to the RRC IDLE/RRC INACTIVE UEs.
  • This case requires a mechanism to point to UE 110 the on-demand SIB1 request/WUS.
  • This case requires UE 110 switching between anchor cell 120-2 and non-anchor cell 120-1 for acquiring the on- demand SIB1. This case seems not as promising as the other scenarios.
  • the preferred embodiments described in this disclosure consider one of the scenarios 1 to 3, in which the on- demand SIB1 configuration (message) is transmitted via the coverage celE
  • a first message for RRC IDLE/INACTIVE UEs to communicate with NW is sending of UL PRACH signal.
  • RRC IDLE/RRC INACTIVE UEs requesting the on-demand SIB(s) other than SIB1 information
  • PRACH may be used as on-demand SIB 1 request for triggering of on-demand SIB1 transmission for RRC IDLE/RRC INACTIVE UEs.
  • UEs may camp on the coverage cell (or, in some embodiments, alternatively being in RRC connected mode with the coverage cell) and may - continuously or triggered by information transmitted from the coverage cell - also search for another cell to switch to, e.g., to camp on.
  • the UE obtains cell reselection priorities, also denoted as frequency priorities, and performs measurements on the neighboring cells having a higher cell reselection priority than the current serving cell, i.e., higher than the coverage cell.
  • FIG. 4 An example situation of UE mobility is depicted in Fig. 4.
  • a UE 110 camps either on coverage cell 120-A of, e.g., gNB 120A, or on coverage cell 120-C of, e.g. gNB 120B. It may be advantageous for the UE to reselect to capacity cell 120-B. Therefore, two situations are conceivable:
  • the UE 110 is camping in the coverage cell 120-C deploying frequency Fl.
  • the network would prefer the UE 110 to move (reselect) to the capacity cell 120-B deploying frequency F2.
  • the legacy UEs (Release 18 and earlier) will also obtain the configuration and attempt to reselect to cell 120-B.
  • the legacy UEs will fail to do so because cell 120-B (F2) is not broadcasting SIB1 and the legacy UEs are not able to request the SIB1 from cell 120-B.
  • the network may address this by providing frequency priority configurations of cell 120-B to the Release 19 UEs in a dedicated manner.
  • This is a complicated solution, because the signaling is then required to be done per UE 110, i.e., each UE 110 needs to be in RRC CONNECTED state to receive the configuration.
  • the network may not be aware that a Release 19 (or later) UE 110 in RRC IDLE or RRC INACTIVE state has moved from a certain cell to cell 120-A (as long as they are in the same tracking area). Therefore, the UE 110 may be subject to offloading to the capacity cell 120-B but the network will not configure the frequency priority for the UE 110.
  • This disclosure addresses the issue of how to configure cell reselection priorities (or, in other words, frequency priorities for cell reselection) such that, based on those frequency priorities, only Release 19 (and later) UEs 110 are attempting to reselect to a capacity cell, which operates in on-demand SIB1 mode.
  • FIG. 5 presents a flow chart of a method performed by a user equipment 110 for supporting switching (e.g., reselection or handover) towards an on-demand SIB1 cell, e.g., capacity cell 120-B of FIG. 4, according to the disclosure.
  • the UE 110 supports on-demand system information block 1, SIB1, mode operation (e.g., is a Release 19 UE of NR or later), and is served by a first cell, e.g., coverage cell 120-A or coverage cell 120-B of FIG. 4.
  • SIB1 system information block 1
  • the UE may be in radio resource control, RRC, idle (RRC IDLE) or inactive (RRC INACTIVE) mode or also in some embodiments in RRC connected mode (RRC CONNECTED).
  • the UE 100 receives (as shown in box 610) from the first cell 120-A, 120-C an indication of an on-demand SIB1 cell reselection priority associated with a frequency band deployed by the second cell 120-B.
  • the on-demand SIB1 reselection priority is higher than the reselection priority associated with the frequency band deployed by the first cell 120-A, 120-C.
  • the UE 110 may in some examples also receive the on-demand SIB1 reselection priority as described below but may then not perform the next processes as described below, i.e., may not perform measurements as, e.g., defined in 3GPP TS 38.304, Release 17 or 18, clause 5.2.4.2.
  • the UE 110 then, i.e., if the on-demand SIB1 reselection priority of the second cell is higher than the reselection priority of the first cell 120-A, 120-C, performs (as shown in box 620) measurements with respect to the frequency band deployed by the second cell 120-B based on the on-demand SIB1 reselection priority.
  • the measurements may, e.g., be cell reselection measurements concerning at least one of reference signal received power (RSRP) and reference signal received quality (RSRQ) of the second cell 120-B.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • the UE 110 further determines (as shown in box 630) whether to reselect to towards the second cell 120-B based on results of the measurements. For example, if the signal received power and/or signal received quality of the second cell 120-B are above a threshold (or a threshold for each), the UE 110 may determine to reselect towards the second cell 120-B. Further conditions as described in 3GPP TS 38.304, Release 17 or 18, clause 5.2.4.2, may apply, too.
  • the UE 110 may also take the cell reselection priority (either the on-demand SIB1 cell reselection priority or the usual/legacy cell reselection priority of the second cell 120- B depending on the mode the cell is operating in) into account for the decision to switch to the second cell 120-B.
  • the cell reselection priority either the on-demand SIB1 cell reselection priority or the usual/legacy cell reselection priority of the second cell 120- B depending on the mode the cell is operating in
  • the on-demand SIB1 cell reselection priority of the second cell 120-B may be different from a cell reselection priority of the second cell 120-B when not operating in SIB1 on-demand mode.
  • the "usual" cell reselection priority of the second cell 120-B may, e.g., be defined by the frequency priority of the frequency (e.g., F2) deployed by the second cell 120- B.
  • frequency F2 may have been given a priority of 5, which is provided to the UE 110, e.g., in system information block, SIB, information of the first cell 120-A, 120-C within the information element (IE) CellReselectionPriority - and in some examples also additionally within the IE CellReselectionSubPriority - as defined in 3GPP TS 38.3331, Release 17 or 18.
  • the on-demand SIB1 cell reselection priority with, e.g., a value of 7 may be provided by the first cell 120-A, 120-C to non-legacy UEs 110 in order to force reselection towards the second cell 120-B.
  • the indication of the on-demand SIB1 cell reselection priority may be included in an on-demand SIB1 configuration message for the second cell 120- B.
  • the on-demand SIB1 configuration message may comprise on-demand SIB1 configuration information for transmitting a SIB1 request, for receiving a SIB1 response, and/or for receiving the on-demand SIB1 information from the second cell 120-B.
  • the on-demand SIB1 configuration message may also or additionally comprise other information related to the acquisition of the on-demand SIB1 information from the second cell 120-B.
  • the on-demand SIB1 configuration message may, in some examples, comprise the on-demand SIB1 cell reselection priority, i.e., the indication of the on-demand SIB1 cell reselection priority relates to an explicit value of the priority, and at least one of a Physical Cell ID, PCI, of the second cell 120-B and the frequency band deployed by the second cell 120-B.
  • the on-demand SIB1 configuration message may further comprise an indication regarding the applicability of the on-demand SIB1 cell reselection priority.
  • Such an indication regarding the applicability of the on-demand SIB1 cell reselection priority may indicate applicability to the PCI of the second cell 120-B and/or to the frequency band deployed by the second cell 120-B.
  • the on-demand SIB1 cell reselection priority can be defined for a specific cell or for all on-demand cells that operate in a frequency.
  • the on-demand SIB1 configuration message may comprise a Physical Cell ID, PCI, of the second cell 120-B and the frequency band deployed by the second cell 120-B.
  • the indication of the on-demand SIB1 cell reselection priority relates to an implicit indication of a highest or predefined value for the on- demand SIB1 cell reselection priority by receiving the on-demand SIB1 configuration message. This means, receiving the on-demand SIB1 configuration message may be an implicit instruction to the UE 110 to perform the measurements.
  • the indication of the on-demand SIB1 cell reselection priority may be included in a system information block, SIB, message including the on-demand SIB1 cell reselection priority.
  • the indication is again an explicit value of the priority.
  • the SIB message may comprise one or more SIB2 and/or SIB4 information elements defining the on-demand SIB1 cell reselection priority.
  • the SIB message may also comprise one or more SIB2 and/or SIB4 information elements defining a cell reselection priority for the second cell 120-B when not operating in SIB1 on-demand mode.
  • the UE 110 may be in RRC CONNECTED mode while receiving the indication of the on-demand SIB 1 cell reselection priority and in RRC idle or inactive mode when performing measurements and determining to switch, i.e., reselect towards the second cell.
  • the UE 110 may switch directly from RRC connected mode in the first cell to RRC idle/inactive mode in the second cell (i.e., skipping being in idle/inactive in the first cell).
  • FIG. 6 presents different alternatives of a method performed by a first cell, such as coverage cell 120-A, 120-B of FIG. 4, in a mobile communication system supporting reselection of a user equipment, UE 110, towards a second cell, such as capacity cell 120-B of FIG. 4, operating in an on-demand system information block 1, SIB1, mode, according to the disclosure.
  • the UE 110 is supporting on-demand SIB1 mode operation and camping on the first cell in radio resource control, RRC, idle or inactive mode.
  • the method of FIG: 6 comprises one process, which depicted in box 610 and corresponds to the process of box 510 of FIG. 5 for the UE 100.
  • the first cell 120-A, 120-C transmits (as shown in box 610) an indication of an on-demand SIB1 cell reselection priority associated with a frequency band deployed by the second cell 120-B to the UE 110.
  • the on- demand SIB1 reselection priority is again assumed to be higher than the reselection priority associated with the frequency band deployed by the first cell 120-A, 120-C.
  • the indication triggers, at the UE, measurements with respect to the frequency band deployed by the second cell 120-B based on the on-demand SIB1 reselection priority and triggers a determination to reselect to towards the second cell 120-B based on results of the measurements.
  • the measurements may, e.g., be cell reselection measurements concerning at least one of reference signal received power (RSRP) and reference signal received quality (RSRQ) of the second cell 120-B.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • frequency F2 may have been given a priority of 5, which is provided to the UE 110, e.g., in system information block, SIB, information of the first cell 120-A, 120-C within the information element (IE) CellReselectionPriority - and in some examples also additionally within the IE CellReselectionSubPriority - as defined in 3GPP TS 38.3331, Release 17 or 18.
  • the on-demand SIB1 cell reselection priority with, e.g., a value of 7 may be provided by the first cell 120-A, 120-C to non-legacy UEs 110 in order to force reselection towards the second cell 120-B.
  • the indication of the on-demand SIB1 cell reselection priority may be included in an on-demand SIB1 configuration message for the second cell 120- B, which is shown in box 611.
  • the on-demand SIB1 configuration message may comprise on- demand SIB1 configuration information for transmitting a SIB1 request, for receiving a SIB1 response, and/or for receiving the on-demand SIB1 information from the second cell 120-B.
  • the on-demand SIB1 configuration message may also or additionally comprise other information related to the acquisition of the on-demand SIB1 information from the second cell 120-B.
  • the on-demand SIB1 configuration message may, in some examples, comprise the on-demand SIB1 cell reselection priority, i.e., the indication of the on-demand SIB1 cell reselection priority relates to an explicit value of the priority (as shown in box 612), and at least one of a Physical Cell ID, PCI, of the second cell 120-B and the frequency band deployed by the second cell 120-B.
  • the on-demand SIB1 configuration message may further comprise an indication regarding the applicability of the on-demand SIB1 cell reselection priority.
  • FIGs. 7 to 9 now present illustrations of embodiments for providing an on-demand SIB1 cell reselection priority of a cell operating in on-demand SIB1 mode according to the disclosure.
  • abase station 120 provides a coverage cell 120-A and an on-demand SIB1 capacity cell 120-B.
  • the coverage cell 120-A (also known as anchor cell) transmits the WUS configuration, i.e., the on-demand SIB1 configuration message (or messages), to the UE 110.
  • the WUS configuration may be defined per PCI and may be used by the UE to send an UL- WUS, i.e., an on-demand SIB1 request, to trigger the SIB1 transmission by the second cell 120- B with the given PCI.
  • the WUS configuration includes at least an indication of a frequency priority for the frequency layer or for each of the frequency layers, in which the second cell 120-B and/or other on-demand SIB1 cells operate.
  • These frequency priorities i.e., corresponding to on- demand SIB1 cell reselection priorities, are to be used by the UE 110 to perform cell reselection to an on-demand SIB1 cell (e.g., to the capacity cell 120-B) deploying the corresponding frequency carrier.
  • the frequency priority included in the WUS configuration may be provided for the PCI of the capacity cell 120-B, for which the WUS configuration is defined. Alternatively or additionally, the frequency priority included in the WUS configuration may be provided for the (or one) frequency layer of the second cell 120-B (i.e., the frequency priority may be applicable for any cell deploying the respective frequency layer). A flag could indicate whether the frequency priority is applicable to the PCI(s) and/or frequency layer(s).
  • the WUS configuration includes not only the PCI of the capacity cell 120-B, but also the frequency layer of the PCI, i.e., of the capacity cell 120-B.
  • the UE 110 receives the WUS configuration including the frequency layer information, the UE 110 is triggered to search for the PCI on the frequency layer and perform measurements of the respective capacity cell 120-B.
  • the trigger to measure power/quality (e.g., RSRP/RSRQ) of the second cell 120-B is independent of the frequency priority configuration provided in SIB2/4.
  • the 3GPP TS 38.304, Release 17 or 18, clause 5.2.4.2 may be amended, for Release 19 or later, such that a further condition for a UE being triggered to perform cell search may be added, which reads "If the UE is operating in radio resource control, RRC, idle or inactive mode and receives an on-demand SIB1 configuration information for requesting acquisition of SIB1 information from a cell operating in on-demand SIB1 mode, the UE shall perform measurements of such NR inter-frequency cells of equal or lower priority, or such inter-RAT frequency cells of lower priority according to TS 38.133 [8]" or similar.
  • the UE 110 After the UE 110 received the WUS configuration implicitly indicating the frequency priority (a high/predefined etc. priority) of the capacity cell 120-B (i.e., the on-demand SIB1 cell reselection priority), the UE 110 performs measurements of the capacity cell 120-B (if the frequency priority of the capacity cell 120-B is higher/equal than/to the frequency priority of the serving coverage cell 120-A). If the UE 110 then determines to reselect towards the capacity cell 120-B, the UE 110 transmits a SIB1 request to the second cell 120-B, in order to then receive the SIB1 of the second cell 120-B (which is only transmitted on-demand).
  • the UE 110 performs measurements of the capacity cell 120-B (if the frequency priority of the capacity cell 120-B is higher/equal than/to the frequency priority of the serving coverage cell 120-A). If the UE 110 then determines to reselect towards the capacity cell 120-B, the UE 110 transmits a SIB1 request
  • the base station 120 again provides a coverage cell 120-A and an on- demand SIB1 capacity cell 120-B.
  • the coverage cell 120-A transmits the WUS configuration, i.e., the on-demand SIB1 configuration message (or messages), to the UE.
  • the WUS configuration may be defined per PCI and may be used by the UE 110 to send an UL-WUS, i.e., an on-demand SIB1 request, to trigger the SIB1 transmission by the second cell 120-B with the given PCI.
  • the WUS configuration does not include information with respect to the frequency priority but only the PCI of the capacity cell 120-B.
  • the SIB2 and/or SIB4 of the coverage cell 120-B includes an additional information element with specific on-demand SIB1 frequency priority or frequency priorities.
  • SIB2 and/or SIB4 may comprise IE CellReselectionPriority - and in some examples also additionally IE CellReselectionSubPriority - as defined in 3GPP TS 38.3331, Release 17 or 18.
  • These IES may define the legacy cell reselection priority for a frequency.
  • SIB2 and/or SIB4 may comprise further IEs that define specific on-demand SIB1 frequency priorities, i.e., for cells operating in on-demand SIB1 mode, e.g., IEs CellReseletionSIBlondemandPriority and/or CellReselectionSIBlondemandSubPriority.
  • the cell reselection priority of the on-demand SIB1 cells may be included in a new IE InterFreqNeighCellList-vl910, similar to the legacy IE InterFreqNeighCellList-vl610 or -vl710 but with a new IE InterFreqNeighCelllnfo, which comprises the on-demand SIB1 frequency priority as parameter/IE, e.g., cellReselectionSIBlondemandPriority or the like.
  • the Release 19 UEs 110 may apply the additional information element IEs (i.e., the on-demand SIB1 specific frequency priority) as soon as WUS configuration is received.
  • the UEs 110 may apply the additional IEs to the PCI(s) included in the WUS configuration only and not to the entire frequency layer, i.e., other cells operating in legacy SIB1 mode on the same frequency.
  • the legacy UEs in contrast, do not understand the additional IEs and will only apply the legacy cell reselection IEs and the respective frequency priorities.
  • the UE 110 may in alternative embodiments be in RRC CONNECTED mode in the coverage cell 120-A, such that the UE 110 can receive the WUS configuration and/or frequency priority information via a dedicated RRC signalling, e.g. as part of an RRC Release message.
  • the UE 110 obtains (arrow 1004) an SSB from the coverage cell 120-A and performs cell measurements.
  • the UE 110 also obtains (arrow 1005) an SSB from the capacity cell 120-B and performs cell measurements as well.
  • the UE may then determine that the capacity cell 120-B is a suitable candidate for cell reselection (box 1006), e.g., because it has a higher/equal priority and the measurement results fulfill threshold(s) defined the in the 3 GPP standards.
  • the UE 110 sends (arrow 1007) an on-demand SIB1 request to the capacity cell 120-B, e.g., a random access preamble indicating that the UE 110 requires the SIB1 of the capacity cell 120-B.
  • the capacity cell 120-B then transmits (arrow 1008) the SIB1 information to the UE, e.g., by turning broadcast of SIB1 on, by sending a dedicated RRC message with the SIB 1 information, or the like.
  • FIG. 11 depicts a message flow diagram of providing the on-demand SIB1 cell reselection priority implicitly within the on-demand SIB1 configuration message according to the disclosure.
  • the UE 110 again camps on the coverage cell 120-A, which has PCI A and operates on frequency Fl.
  • the UE 110 receives (arrow 1001, i.e., similar as in FIG. 10) the SIBs as defined, e.g., for Release 17 and/or 18 of NR from the coverage cell 120-A, which comprise cell reselection priority for different frequency layers.
  • frequency Fl has a higher priority than frequency F2. Since capacity cell 120-B with PCI B operates in frequency F2, a legacy UE only receiving the legacy SIB information will not perform cell search and measurements towards capacity cell 120-B.
  • the UE 110 also receives (arrow 1102, i.e., different from FIG. 10) an on-demand SIB1 configuration message (or messages) from the coverage cell 120-A, which comprises information with respect to the capacity cell 120-B. This is indicated by the PCI B as described with respect to FIG. 10. However, contrary what was explained with respect to FIG: 10, the on- demand SIB1 configuration message does not comprises an on-demand SIB1 cell reselection priority for F2 but only indicates that the capacity cell 120-B with PCI B operating on frequency F2.
  • the UE 110 obtains (arrow 1004) an SSB from the coverage cell 120-A and performs cell measurements.
  • the UE 110 also obtains (arrow 1005) an SSB from the capacity cell 120-B and performs cell measurements as well.
  • the UE may then determine that the capacity cell 120-B is a suitable candidate for cell reselection (box 1006), e.g., because it has a higher/equal priority and the measurement results fulfill threshold(s) defined the in the 3 GPP standards.
  • the UE 110 sends (arrow 1007) an on-demand SIB1 request to the capacity cell 120-B, e.g., a random access preamble indicating that the UE 110 requires the SIB1 of the capacity cell 120-B.
  • the capacity cell 120-B then transmits (arrow 1008) the SIB1 information to the UE, e.g., by turning broadcast of SIB1 on, by sending a dedicated RRC message with the SIB 1 information, or the like.
  • the UE 110 also receives (arrow 1202) an on-demand SIB1 configuration message (or messages) from the coverage cell 120-A, which comprises information with respect to the capacity cell 120-B but do not affect the priority of the frequency of the capacity cell 120-B but only define other parameters needed to obtain SIB1 from capacity cell 120-B (which may be required later).
  • the UE 110 already knows that frequency F2 has a higher cell reselection priority than Fl for on-demand SIB1 cells (from the SIB2/SIB4) and now also knows that capacity cell 120-B operates in on-demand SIB1 mode. Therefore, a cell search and measurements are triggered at the UE 110 (box 1203) according to the on-demand SIB1 cell reselection priority received in SIB2 and/or SIB4.
  • the UE 110 obtains (arrow 1004) an SSB from the coverage cell 120-A and performs cell measurements.
  • the UE 110 also obtains (arrow 1005) an SSB from the capacity cell 120-B and performs cell measurements as well.
  • the UE may then determine that the capacity cell 120-B is a suitable candidate for cell reselection (box 1006), e.g., because it has a higher/equal priority and the measurement results fulfill threshold(s) defined the in the 3 GPP standards.
  • the UE 110 sends (arrow 1007) an on-demand SIB1 request to the capacity cell 120-B, e.g., a random access preamble indicating that the UE 110 requires the SIB1 of the capacity cell 120-B.
  • the capacity cell 120-B then transmits (arrow 1008) the SIB1 information to the UE, e.g., by turning broadcast of SIB1 on, by sending a dedicated RRC message with the SIB 1 information, or the like.
  • the herein described procedures may be applied per model or per functionality level (identified by an identifier) or across models or functionalities of a given entity, e.g., as a UE feature.
  • the apparatuses described herein may comprise or be coupled to other units or modules etc., such as radio parts or radio heads, used in or for transmission and/or reception.
  • the apparatuses have been described as one entity, different modules and memory may be implemented in one or more physical or logical entities.
  • Similar principles may be applied in relation to other networks and communication systems where enforcing fast connection re-establishment is required. Therefore, although certain embodiments were described above by way of example with reference to certain example architectures for wireless networks, technologies and standards, embodiments may be applied to any other suitable forms of communication systems than those illustrated and described herein.
  • the various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • Some aspects of the subject disclosure may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the subject disclosure is not limited thereto. While various aspects of the subject disclosure may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • Example embodiments of the subject disclosure may be implemented by computer software executable by a data processor of the mobile device, such as in the processor entity, or by hardware, or by a combination of software and hardware.
  • Computer software or program also called program product, including software routines, applets and/or macros, may be stored in any apparatus-readable data storage medium and they comprise program instructions to perform particular tasks.
  • a computer program product may comprise one or more computerexecutable components which, when the program is run, are configured to carry out embodiments.
  • the one or more computer-executable components may be at least one software code or portions of it.
  • any blocks of the logic flow as in the figures may represent program processes, or interconnected logic circuits, blocks and functions, or a combination of program processes and logic circuits, blocks and functions.
  • the software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.
  • the physical media is a non-transitory media.
  • the memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors may be of any type suitable to the local technical environment, and may comprise one or more of general-purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASICs), FPGA, gate level circuits and processors based on multicore processor architecture, as non-limiting examples.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGA gate level circuits and processors based on multicore processor architecture, as non-limiting examples.

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  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne des procédés, des appareils et des systèmes pour un équipement utilisateur (UE) prenant en charge un fonctionnement en mode de bloc d'informations système à la demande 1 (SIB1) et desservi par une première cellule, les procédés, appareils et systèmes prenant en charge la commutation vers une seconde cellule fonctionnant dans un mode de SIB1 à la demande. L'UE reçoit de la première cellule une indication d'une priorité de resélection de cellule à SIB1 à la demande associée à une bande de fréquence déployée par la seconde cellule, la priorité de resélection de SIB1 à la demande étant supérieure à la priorité de resélection associée à la bande de fréquence déployée par la première cellule, effectue des mesures par rapport à la bande de fréquence déployée par la seconde cellule sur la base de la priorité de resélection de SIB1 à la demande, et détermine une commutation vers la seconde cellule sur la base des résultats des mesures. L'invention concerne des procédés, des appareils et des systèmes similaires pour une cellule.
PCT/EP2025/054859 2024-04-04 2025-02-24 Procédures de mobilité pour cellules à sib1 à la demande Pending WO2025209722A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Non-Patent Citations (3)

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Title
HAO LIN ET AL: "Discussion on the enhancement to support on demand SIB1 for idle/inactive mode UE", vol. RAN WG1, no. Athens, GR; 20240226 - 20240301, 19 February 2024 (2024-02-19), XP052568382, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/TSG_RAN/WG1_RL1/TSGR1_116/Docs/R1-2400600.zip R1-2400600.docx> [retrieved on 20240219] *
WEI ZENG ET AL: "On On-demand SIB1 for IDLE/INACTIVE mode UEs", vol. RAN WG1, no. Athens, GR; 20240226 - 20240301, 19 February 2024 (2024-02-19), XP052568792, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/TSG_RAN/WG1_RL1/TSGR1_116/Docs/R1-2401021.zip R1-2401021_NES On-demand SIB1-Apple RAN1#116.docx> [retrieved on 20240219] *
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