Energy savings for mobile devices in wireless communication systems

Abstract

Methods, systems, and devices are described for energy conservation in a mobile device operating in a mobile communications technology. An example wireless communication method includes transmitting, by a first network node, a system information block to a wireless device, where the system information block is a first type of system information block, a second type of system information block, or a third type of system information block, wherein the first type of system information block comprises cell-specific parameters for cell selection or cell reselection by the wireless device, and wherein the second type of system information block comprises parameters for connection establishment or service establishment, and wherein the third type of system information block comprises a parameter associated with a change in the system information.

Description

[0001] This application is a divisional application of the invention patent application with international application number PCT / CN2020 / 107981, international application date August 7, 2020, entering the Chinese national stage on November 23, 2022, Chinese national application number 202080101322.9, and invention name “Energy saving of mobile devices in wireless communication systems”. Technical Field

[0002] This document relates generally to wireless communications. Background Art

[0003] Wireless communication technology is driving the world towards an increasingly connected and networked society. The rapid growth of wireless communications and technological advances have led to greater demands for capacity and connectivity. Other aspects such as energy consumption, equipment cost, spectrum efficiency, and latency are also important to meet the needs of various communication scenarios. Compared with existing wireless networks, next-generation systems and wireless communication technologies will support more users and devices and support higher data rates. Summary of the invention

[0004] The present invention relates to methods, systems and devices for energy saving in mobile devices operating in mobile communication technologies (including 5th generation (5G) and new radio (NR) communication systems) when connected to non-terrestrial network nodes.

[0005] In one exemplary aspect, a wireless communication method is disclosed. The method includes transmitting, by a first network node, a system information block to a wireless device, wherein the system information block is a first type of system information block, a second type of system information block, or a third type of system information block, wherein the first type of system information block includes cell-specific parameters for cell selection or cell reselection by the wireless device, wherein the second type of system information block includes parameters for connection establishment or service establishment, and wherein the third type of system information block includes parameters associated with a change in system information.

[0006] In another exemplary aspect, a wireless communication method is disclosed. The method includes receiving, by a wireless device, a first system information block from a first network node, wherein the first system information block is a first type of system information block, a second type of system information block, or a third type of system information block, wherein the first type of system information block includes cell-specific parameters for cell selection or cell reselection by the wireless device, wherein the second type of system information block includes parameters for connection establishment or service establishment, and wherein the third type of system information block includes parameters associated with a change in system information.

[0007] In yet another exemplary aspect, a wireless communication method is disclosed. The method includes monitoring, by a wireless device, a control channel at a maximum of (N-1) control channel monitoring opportunities within a duration corresponding to a round trip time (RTT) between the wireless device and a non-terrestrial network (NTN) node, wherein the RTT includes N control channel monitoring opportunities, wherein the wireless device is configured to receive the control channel at one or more control channel monitoring opportunities of the N control channel monitoring opportunities, and wherein N is a positive integer and N≥2.

[0008] In yet another exemplary aspect, a wireless communication method is disclosed. The method includes receiving, by a wireless device from a network node, a system information block including a preference indication of a serving cell or a neighboring cell, and performing one or more cell measurements for a subsequent cell selection or cell reselection procedure based on the preference indication.

[0009] In yet another exemplary aspect, a wireless communication method is disclosed. The method includes transmitting, by a network node to a wireless device, a system information block including a preference indication of a serving cell or a neighboring cell, wherein the wireless device is configured to perform one or more cell measurements for a subsequent cell selection or cell reselection process based on the preference indication.

[0010] In yet another exemplary aspect, the above method is embodied in the form of processor executable code and stored in a computer readable program medium.

[0011] In yet another exemplary embodiment, a device configured or operable to perform the above method is disclosed.

[0012] The above and other aspects and implementations thereof are described in more detail in the drawings, the description and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Examples of a network node (eg, a base station or gNodeB) and a wireless device (eg, a user equipment (UE)) in wireless communications are shown.

[0014] Figure 2A An example of a system information (SI) acquisition process is shown.

[0015] Figure 2B and Figure 2C Another example of the SI acquisition process is shown.

[0016] Figure 2D Yet another example of the SI acquisition process is shown.

[0017] Figure 3A An example of physical downlink control channel (PDCCH) monitoring with an insufficient number of HARQ processes is shown.

[0018] Figure 3B-Figure 3F An example of PDCCH monitoring with UE power reduction is shown.

[0019] Figure 4A An example of cell selection and reselection is shown.

[0020] Figure 4B Another example of cell selection and reselection is shown.

[0021] Figure 4C Yet another example of cell selection and reselection is shown.

[0022] Figure 5A-5E An example of a wireless communication method is shown.

[0023] Figure 6 is a block diagram representation of a portion of an apparatus that can be used to implement the methods and techniques described herein. DETAILED DESCRIPTION

[0024] Energy saving for wireless devices (e.g., user equipment (UE)) is particularly important for emerging Internet of Things (IoT) applications (e.g., narrowband IoT (NB-IoT) or enhanced machine type communication (eMTC) networks). For IoT networks, frequent system information (SI) reception, physical downlink control channel (PDCCH) monitoring, cell reselection, and tracking area update (TAU) are the main concerns for UE energy saving.

[0025] In the example of an IoT network over a non-terrestrial network (NTN) (e.g., NB-IoT or eMTC transmission via satellite, where the satellite is a NB-IoT eNB, the satellite is an eMTC eNB, the satellite is an RF NB-IoT eNB, or the satellite is an RF of an eMTC eNB), a low earth orbit (LEO) satellite may move rapidly, which may cause the UE to constantly switch coverage from one satellite (e.g., one cell) to another satellite (e.g., another cell) after a predetermined amount of time (e.g., 10 minutes). When the UE moves to a new cell, the UE may be configured to read the SI of the cell. In existing implementations, the UE reads the SI, including basic parameters for the UE to select a cell and / or reside in a cell (e.g., cell access related information, cell selection related parameters, etc.), physical random access channel (PRACH) parameters, and paging control channel (PCCH) parameters once the UE enters a new cell. However, frequent access to the SI may consume a large amount of UE power (e.g., greater than a predetermined amount of power). In fact, it is generally not necessary to access all SI parameters, for example, for mobile terminal initiated connection only (MICO), PCCH parameters are not required.

[0026] On the other hand, for IoT over NTN, the round trip delay (e.g., delay from UE to eNB and delay from eNB to UE) or round trip time (RTT) is very large. Typically, a HARQ process can be used only once within one RTT duration. The maximum number of HARQ processes is usually limited as it is a function of UE capabilities. If the transmission of the maximum number of HARQ processes cannot occupy the entire RTT duration (e.g., Figure 3A As shown), periodic PDCCH monitoring will result in a waste of resources.

[0027] On the other hand of IoT over NTN, the typical cell capacity can only cover open areas with very large coverage areas (e.g., oceans or sparsely populated deserts). In densely populated hotspots, terrestrial networks (TNs) should generally be used. Therefore, in areas where NTN cells and TN cells overlap, the UE must determine how to camp on the appropriate TN cell to save UE power.

[0028] Embodiments of the disclosed technology relate to various aspects of UE power saving, including but not limited to SI reception, PDCCH monitoring, and UE cell selection and reselection.

[0029] Figure 1 An example of a wireless communication system (e.g., an LTE, 5G, or New Radio (NR) cellular network) including a BS 120 and one or more user equipments (UEs) 111, 112, and 113 is shown. In some embodiments, downlink transmissions (141, 142, 143) include system information blocks (SIBs). The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine-to-machine (M2M) device, a terminal, a mobile device, an Internet of Things (IoT) device, etc.

[0030] The section titles and subtitles used herein are intended to facilitate understanding, rather than to limit the scope of the disclosed techniques and embodiments to certain sections. Therefore, the embodiments disclosed in different sections may be used interchangeably. In addition, examples from the 3GPP New Radio (NR) network architecture and 5G protocols are used herein only to facilitate understanding, and the disclosed techniques and embodiments may be practiced in other wireless systems that use communication protocols different from the 3GPP protocols.

[0031] Example Embodiments of System Information Monitoring and Reception

[0032] Figure 2A An example of the SI acquisition process is shown. In some embodiments, the SI and / or SIB are divided into different types based on the characteristics of the parameters. In other embodiments, the reception timing can be configured to be different for different types of SIBs. In some other embodiments, different types of parameters are included in different SIBs and SIs.

[0033] In some embodiments, Figure 2A As shown, SIB1 only includes basic parameters necessary for UE to select and / or camp on a cell (e.g., cell access related information, cell selection related parameters, etc.) and parameters necessary for UE to receive other SI information (e.g., an indication of whether SI remains unchanged when reselecting to a new cell, SI scheduling related parameters, etc.). In one example, service establishment related parameters are not included in SIB1.

[0034] like Figure 2A As further shown, other SI is transmitted using at least the following three types of SIBs:

[0035] -SIB type x: This type of SIB includes cell-specific parameters (e.g., cell reselection related parameters, etc.) used by the UE to camp on a cell (these parameters are usually different for different cells), and includes cell-specific parameters that the UE usually obtains when reselecting a cell. Several parameters included in SIB type x are cell-specific parameters that are not suitable for inclusion in SIB1. Therefore, the UE can be configured to obtain and process this type of SI once the UE selects or reselects and camps on a cell or when the eNB indicates that the SI has changed.

[0036] -SIB type y: This type of SIB includes mobile terminal originated (MO) related parameters (e.g., physical random access channel (PRACH) parameters, access barring (AB) parameters, extended access barring (EAB) parameters, unified access control (UAC) parameters, etc.), which are only used when the UE decides to establish a service or establish an RRC connection. Therefore, the UE can only obtain and process this type of SI when it decides to establish a service or establish an RRC connection.

[0037] -SIB type z: This type of SIB includes mobile terminal (MT) related parameters (e.g., paging control channel (PCCH) related parameters, etc.) (the parameters are only used when the UE is paged), service-specific parameters and / or area-specific parameters (e.g., the parameter values ​​within the area are generally the same, and an area range is generally larger than a cell range). Typically, paging parameters may be the same in a large area (e.g., in an eNB area or in a TAC area). Therefore, the UE can only acquire and process this type of SI when necessary, for example, when the SI changes (e.g., parameters change) and the UE needs to update its SI (e.g., not only mobile terminal initiated connection (MICO) and mobile terminal terminated (MT) related parameters are required). In one example, an SI area ID or an SI change indication can be used to indicate whether the SI has changed, for example, an SI area ID for a specific SI / SIB change or an SI change indication indicating a specific SI change implies that the SI or SIB has changed.

[0038] In some embodiments, in the example of an NTN network, a satellite (e.g., a satellite is an eNB, a satellite is a gNB, a satellite is an eNB's RF, a satellite is a gNB's RF, etc.) moves rapidly on a predefined orbit. Here, the UE may be configured to reselect cells in a predetermined order, for example, the UE selects cell 1, then reselects cell 2, then reselects cell 3, and so on.

[0039] Figure 2B and Figure 2C Another example of a system information (SI) acquisition process is shown. In some embodiments, Figure 2B As shown, cell 1 sends SI of cell 1 to UE, and SI of cell 1 includes partial or complete SI of neighboring cell (e.g., cell 2). When UE camps on cell 1, it can decide whether the neighboring cell (e.g., cell 2) is more suitable for camping and whether to initiate a reselection process to the neighboring cell (e.g., cell 2) based on the partial or complete SI of cell 2 received from cell 1. When UE moves from cell 1 to a neighboring cell (e.g., cell 2), it can immediately perform service establishment without acquiring SI of neighboring cells.

[0040] Similarly, cell 2 sends SI of cell 2 to UE, and SI of cell 2 includes partial or complete SI of cell 3. When UE camps on cell 2, it can decide whether cell 3 is more suitable for camping and whether to initiate a reselection process to cell 3 based on partial or complete SI of cell 3 received from cell 2. When UE moves from cell 2 to cell 3, service establishment can be performed immediately without acquiring SI of cell 3.

[0041] In this example, the SI may also include cell selection and / or reselection related information, which may enable the UE to understand all necessary network information and enable it to determine in advance whether a network, cell or neighboring cell is preferred. The cell selection and / or reselection related information includes at least one of the following: serving cell load information, neighboring cell load information, service types supported by the serving cell, service types supported by the neighboring cell, antenna information, radio access technology (RAT) information of the neighboring cell, serving cell type (e.g., TN or NTN cell), neighboring cell type (e.g., TN or NTN cell), neighboring cell location information, neighboring cell measurement and / or selection priority, network holographic topology information or floor plan. This information may improve the user experience during the cell reselection process.

[0042] In some embodiments, the SI valid duration is indicated in the SI. In one example, the SI valid duration is an SI valid timer. In another example, the SI valid duration is an SI valid start timing and / or an SI valid end timing for the UE to determine whether the received SI is valid.

[0043] In order for a cell to transmit the SI of its neighboring cells, the SI of the neighboring cells needs to be exchanged between different NodeBs (e.g., eNBs and / or gNBs). Figure 2C As shown, NodeB1 sends an SI delivery request for a neighboring cell to NodeB 2, which request may be sent via an X2 or Xn common message (e.g., X2 setup request, ENB configuration update, X2AP message transmission, XN setup request, NG-RAN node configuration update, XNAP message transmission, cell activation request, resource status request, or SI delivery request message).

[0044] NodeB 2 delivers the SI of its cell to NodeB 1. The SI may be sent based on a request from NodeB 1, or may be actively sent by NodeB 2 via an X2 or Xn common message (e.g., X2 establishment request, X2 establishment response, ENB configuration update, ENB configuration update confirmation, X2AP message transmission, XN establishment request, XN establishment response, NG-RAN node configuration update, NG-RAN node configuration update confirmation, XNAP message transmission, cell activation request, cell activation response, resource status request, resource status response, or SI delivery message) (e.g., when NodeB 2 is powered on, an X2 connection is (re)established, an Xn connection is (re)established, or the Xn connection may be triggered by an SI change of NodeB 2).

[0045] In some embodiments, Figure 2DAs shown, the UE can be configured to store the SI of each of the multiple cells it has camped on. Therefore, once the UE reselects to a cell whose SI is stored, it can retrieve the stored SI information, thereby avoiding obtaining and processing SI when reselecting to the new cell. This advantageously saves UE power and improves the user experience during the cell reselection process.

[0046] In some embodiments, the SI valid duration may also be used for the stored SI. In one example, the SI valid duration is an SI valid timer. For another example, the SI valid duration is an SI valid start timing and / or an SI valid end timing for the UE to determine whether the stored SI is valid.

[0047] In some embodiments, the UE can decide whether the SI of a cell is stored based on the cell identity (e.g., the cell identity of the reselected cell is the same as the cell identity of the stored SI) or the UE positioning (e.g., when the UE moves to a certain location, it can retrieve the stored location of the SI).

[0048] Example Embodiment of PDCCH Monitoring

[0049] In some embodiments, the UE supports two HARQ processes:

[0050] - HARQ x DL indicates downlink transmission of HARQ process #x, which may include transmission of PDCCH for uplink (UL) grant, PDCCH for downlink (DL) grant, and Physical Downlink Shared Channel (PDSCH).

[0051] -HARQ y UL indicates uplink transmission of HARQ process #y, which may include transmission of Physical Uplink Shared Channel (PUSCH) and HARQ Acknowledgement (ACK) / Negative ACK (NACK).

[0052] Here, if HARQ x DL indicates downlink transmission of UL HARQ process #x, including transmission of PDCCH for uplink (UL) grant, then HARQ x UL indicates uplink transmission of UL HARQ process #x including PUSCH. If HARQ xDL indicates downlink transmission of DL HARQ process #x, including transmission of PDCCH for downlink (DL) grant and / or transmission of PDSCH, then HARQ x UL indicates uplink transmission of DL HARQ process #x including HARQ acknowledgement (ACK) / negative ACK (NACK).

[0053] Typically, if a UE supports two HARQ processes, the UE simultaneously supports two downlink HARQ processes and two uplink HARQ processes. For illustrative purposes, the drawings and descriptions relate to unidirectional HARQ processes (eg, HARQ processes for DL ​​only, or HARQ processes for UL only).

[0054] Figure 3A An example of monitoring the physical downlink control channel (PDCCH) in the current implementation is shown. Wherein, the dotted line indicates the PDCCH monitoring opportunity corresponding to when the UE should monitor the PDCCH. However, due to the limitation of the number of HARQ processes supported by the UE, the PDCCH cannot be sent. But this will cause the UE to monitor additional PDCCH opportunities without detecting the PDCCH, resulting in a waste of monitoring resources.

[0055] Figure 3B An example of PDCCH monitoring with UE power reduction is shown. As shown, using a larger PDCCH gap results in only two PDDCH opportunities for transmission of the two processes, where the PDCCH gap is the time interval between two adjacent PDCCH monitoring opportunities. Therefore, there are fewer PDCCH opportunities within the RTT duration, and there is minimal or no waste of resources on monitoring.

[0056] In some embodiments, based on the PDCCH used to schedule DL transmission and / or UL transmission, the appropriate number of PDCCH opportunities in one RTT duration can be determined as 2×HARQProcessNumber, and the appropriate PDCCH gap can be determined as the value closest to floor(RTT / (2×HARQProcessNumber)).

[0057] Figure 3C Another example of PDCCH monitoring with UE power reduction is shown. In this example, RTT is provided to the UE. Once the UE detects the maxHARQProcessNumber of the scheduled DL HARQ process and the maxHARQProcessNumber of the scheduled UL HARQ process within one RTT duration, the UE terminates PDCCH monitoring within the RTT duration.

[0058] Figure 3DAnother example of PDCCH monitoring with UE power reduction is shown. In this example, the minimum RTT and / or timerStartOffset parameters are provided to the UE. When the UE transmits Msg1 (preamble) or RRC Msg3, the UE does not monitor the PDCCH for a subsequent duration of the minimum RTT and / or timerStartOffset because only one HARQ process is supported in the random access procedure and the eNB does not schedule the UE until it receives an UL transmission. In one example, the timerStartOffset parameter is a timer provided by the eNB to delay the UE from starting ra-ResponseWindowSize and / or mac-ContentionResolutionTimer.

[0059] Figure 3E Yet another example of PDCCH monitoring with UE power reduction is shown. In this example, a discontinuous reception (DRX) cycle for PDCCH monitoring is provided to the UE. When the UE receives its dedicated PDCCH for UL or DL ​​scheduling, the UE does not monitor the PDCCH for the subsequent duration of the DRX cycle. Note that the RAT does not require support for PDCCH monitoring gaps, such as NR.

[0060] Figure 3F Yet another example of PDCCH monitoring with UE power reduction is shown. In this example, an RTT is provided to the UE. Once the UE detects a predefined number of PDCCHs within one RTT duration, the UE will silence (or not monitor) the predefined PDCCH opportunities. In one example, before detecting a scheduled PDCCH, the UE monitors the PDCCH at each PDCCH opportunity, but once a scheduled PDCCH is detected, it will silence two PDCCH opportunities out of every three PDCCH opportunities. Here, the predefined number of PDCCHs and the predefined PDCCH opportunities can be defined by the specification or signaled by the eNB (e.g., in a system information block).

[0061] In some embodiments, to support Figure 3B-Figure 3F The examples described in support of at least one of the following mechanisms:

[0062] 1. New larger values ​​of npdcch-StartSF-USS and / or mpdcch-StartSF-UESS should be supported (for Figure 3B Example of NB-IoT or eMTC on top of NTN shown)

[0063] 2. The RTT duration is provided to the UE (for Figure 3C Example shown)

[0064] 3. When the UE transmits Msg1 (preamble) or RRC Msg3, the UE does not monitor the PDCCH for the subsequent duration of RTT and / or timerStartOffset (for Figure 3D Example shown)

[0065] 4. The DRX cycle for PDCCH monitoring is provided to the UE (for Figure 3E Example shown)

[0066] 5. For a predefined number of PDCCHs within one RTT duration, the UE shall mute the predefined PDDCH opportunities.

[0067] Example embodiments of cell selection and reselection

[0068] Figure 4A An example of cell selection and reselection with UE power reduction is shown. As shown, the SIB includes an indication that the cell is an NTN cell or that the cell is not a primary preferred cell (e.g., a cell with a low priority that has a large coverage area and is not suitable for multiple UEs to reside in). In one example, an indication can be provided for each carrier, which applies to all cells of the carrier. In another example, an indication can be provided for each cell, which applies to the cell.

[0069] In this example, when the UE camps on an NTN cell (and indicates that the cell is an NTN cell or that the cell is not a primary preferred cell), the UE does not perform neighbor cell measurement relaxation, for example, does not perform idle mode relaxation monitoring, and still performs the neighbor cell measurement relaxation with S IntraSearchP and S IntraSearchQ The measurement is still performed with S nonIntraSearchP and S nonIntraSearchQ Unrelated inter-frequency and / or inter-RAT measurements.

[0070] In addition, when the UE camps on a TN cell (eg, without indication), the UE does not perform NTN neighbor cell measurements (equivalent to the NTN neighbor cells being in the BlackCellList).

[0071] Figure 4B Another example of cell selection and reselection for UE power reduction is shown. As shown, the SIB includes an indication that the cell is an NTN cell or that the cell is not a primary preferred cell (e.g., a cell with a low priority that has a large coverage area and is not suitable for multiple UEs to reside). In addition, the SIB also includes an offset for the NTN cell for cell reselection. In one example, an indication can be provided for each carrier, which applies to all cells of the carrier. In another example, an indication can be provided for a cell, which applies to the cell.

[0072] In this example, when the standard R of the serving cell is used s and the standard R of the adjacent cells n When performing cell sorting, always subtract the offset to calculate R s and R n Then determine the NTN cell measurement value. For example:

[0073] R s =Q meas，s +Q hyst -Qoffset temp +Qoffset SCPTM -Qoffset NTN

[0074] R n =Q meas，n -Q offset -Qoffset temp +Qoffset SCPTM -Qoffset NTN

[0075] Here, Qoffset NTN It is the offset of the NTN cell used for cell reselection, which can be provided by the SIB or pre-defined in the specification.

[0076] In some embodiments, the offset can be split into two parameters: Qoffset for geostationary orbit (GEO) NTN cells and low earth orbit (LEO) NTN cells respectively. NTN-GEO and Qoffset NTN-LEO .

[0077] In some embodiments, the offset may be configured as a single value (e.g., in SIB1, SIB2, SIB3) and used for both the serving cell and the neighboring cell. In other embodiments, the offset may be configured as different values ​​used independently for the serving cell (e.g., in SIB1, SIB2, SIB3) and the neighboring cell (e.g., in SIB4 / SIB5).

[0078] Figure 4C Another example of cell selection and reselection with UE power reduction is shown. In this example, the SIB includes cell reselection priority indications for serving cells, neighboring cells and / or neighboring carriers. For the case where NTN cells are set to have a lower priority and non-NTN cells are set to have a higher priority, the following rules apply:

[0079] - When the UE camps on a lower priority cell, the UE does not perform neighbor cell measurement relaxation and measures all neighbor cells.

[0080] - When the UE camps on a higher priority cell, the UE does not measure lower priority cells.

[0081] In some embodiments, the UE may consider the NTN cell with the lowest priority (which may be interpreted as the lowest priority indication configured for the NTN cell or NTN carrier).

[0082] Example methods and implementations of the disclosed technology

[0083] Figure 5A An example of a wireless communication method 510 is shown. The method 510 includes, at operation 512, transmitting, by a first network node, a system information block to a wireless device, wherein the system information block is a system information block of a first type, a system information block of a second type, or a system information block of a third type.

[0084] In some embodiments, a first type of system information block includes cell-specific parameters for cell selection or cell reselection by a wireless device, a second type of system information block includes parameters for connection establishment or service establishment, and a third type of system information block includes parameters associated with changes in system information.

[0085] In some embodiments, the method 510 further includes the following operations: transmitting, by the first network node, a request for system information to a second network node that is a neighbor of the first network node, and receiving, from the second network node, system information associated with the second network node.

[0086] In some embodiments, method 510 also includes receiving, by the first network node, system information associated with the second network node from a second network node that is a neighbor of the first network node, wherein the second network node is configured to transmit the system information based on one or more of the following determinations: (a) the second network node is powered on, (b) a connection between the first network node and the second network node is established or re-established, and (c) a change in the system information associated with the second network node.

[0087] In some embodiments, the system information block from the first network node includes system information associated with the second network node.

[0088] Figure 5B An example of a wireless communication method 520 is shown. The method 520 includes receiving, by a wireless device at operation 522, a first system information block from a first network node, wherein the first system information block is a first type of system information block, a second type of system information block, or a third type of system information block.

[0089] In some embodiments, a first type of system information block includes cell-specific parameters for cell selection or cell reselection by a wireless device, a second type of system information block includes parameters for connection establishment or service establishment, and a third type of system information block includes parameters associated with changes in system information.

[0090] In some embodiments, the type of the system information block is obtained based on the usage timing and / or change probability of the first type, the second type and the third type of system information blocks.

[0091] In some embodiments, the system information includes cell selection related information and network information that configures the wireless device to determine whether a network, cell, or neighboring cell is preferred, and wherein the system information also includes at least one of load information, supported service types, antenna information, radio access technology (RAT) information, cell location information, neighboring cell measurement and / or selection priority, network holographic topology information, and layout planning.

[0092] In some embodiments, the method 520 further comprises the operations of receiving a second system information block from a second network node, storing the first system information block and the second system information block, and performing a cell reselection procedure based on the stored system information blocks.

[0093] In some embodiments, the storing is based on at least one of a system information valid timer, a system information valid start timing, and a system information valid end timing.

[0094] In some embodiments, the first network node and the second network node are non-terrestrial network (NTN) nodes, and wherein the system information block is a system information block (SIB).

[0095] In some embodiments, the parameters used for connection establishment or service establishment are mobile terminal initiated (MO) parameters, including physical random access channel (PRACH) parameters, access barring (AB) parameters, extended access barring (EAB) parameters, or unified access control (UAC) parameters.

[0096] In some embodiments, the MO parameters are obtained and / or processed upon determining that the wireless device is establishing a radio resource control (RRC) connection.

[0097] In some embodiments, the parameters in the third type of system information block are configured to trigger mobile terminated (MT) services and include paging control channel (PCCH) parameters.

[0098] Figure 5CAn example of a wireless communication method 530 is shown. The method 530 includes, at operation 532, monitoring, by the wireless device, a control channel at a maximum of (N-1) control channel monitoring opportunities for a duration corresponding to a round trip time (RTT) between the wireless device and a non-terrestrial network (NTN) node.

[0099] In some embodiments, the RTT includes N control channel monitoring opportunities, and the wireless device is configured to receive the control channel at one or more control channel monitoring opportunities among the N control channel monitoring opportunities, where N is a positive integer and N≥2.

[0100] In some embodiments, monitoring is performed by switching from a first mode to a second mode before monitoring, wherein the control channel is monitored in the second mode, and wherein a number of control channel monitoring opportunities in the second mode is less than a number of control channel monitoring opportunities in the first mode.

[0101] In some embodiments, the time interval between two adjacent opportunities is a predetermined value, and the method 530 further includes the following operation: increasing the time interval based on a process number (expressed as HARQProcessNumber) of a hybrid automatic repeat request (HARQ) message received in the RTT.

[0102] In some embodiments, the time interval between two adjacent opportunities is determined as floor(RTT / (2×HARQProcessNumber)).

[0103] In some embodiments, a maximum of (N-1) control channel monitoring opportunities corresponds to a first maxHARQProcessNumber of scheduled hybrid automatic repeat request (HARQ) messages, and the maxHARQProcessNumber is an integer.

[0104] In some embodiments, the duration between an uplink message transmission and a control channel monitoring start opportunity for subsequent downlink message scheduling is equal to the minimum RTT.

[0105] In some embodiments, method 530 also includes an operation of receiving a timing parameter from the NTN node, wherein the duration between a first control channel monitoring opportunity among the (N-1) control channel monitoring opportunities and a second control channel monitoring opportunity among the (N-1) control channel monitoring opportunities is based on the timing parameter.

[0106] In some embodiments, the timing parameter is based on a timer.

[0107] In some embodiments, the timing parameters are based on discontinuous reception (DRX) cycle parameters.

[0108] In some embodiments, a maximum of (N-1) control channel monitoring opportunities are predetermined prior to monitoring.

[0109] Figure 5D An example of a wireless communication method 540 is shown. The method 540 includes, at operation 542, receiving, by a wireless device from a network node, a system information block including a preference indication of a serving cell or a neighboring cell.

[0110] The method 540 includes, at operation 544, performing one or more cell measurements for a subsequent cell selection or cell reselection process based on the preference indication.

[0111] Figure 5E An example of a wireless communication method 550 is shown. The method 550 includes, at operation 552, transmitting, by a network node to a wireless device, a system information block including a preference indication of a serving cell or a neighboring cell.

[0112] In some embodiments, the wireless device is configured to perform one or more cell measurements for a subsequent cell selection or cell reselection procedure based on the preference indication.

[0113] In some embodiments, the network node is a non-terrestrial network (NTN) node, and wherein the preference indication comprises a priority or a cell type of the terrestrial network node.

[0114] In some embodiments, the cell type is a non-terrestrial network (NTN) cell or a terrestrial network (TN) cell.

[0115] In some embodiments, one or more cell measurements include an offset when the measurements correspond to an NTN node.

[0116] In some embodiments, the offset is a first value when the NTN node is in geostationary orbit and the offset is a second value when the NTN node is in low earth orbit.

[0117] In some embodiments, terrestrial network nodes are prioritized over non-terrestrial network (NTN) nodes.

[0118] In some embodiments, the system information block is a system information block.

[0119] Figure 6605 is a block diagram representation of a portion of an apparatus that can be used to implement the methods (including but not limited to method 500) and techniques described in this document. An apparatus 605, such as a base station or a wireless device (or UE), may include a processor electronic device 610, such as a microprocessor, that implements one or more of the techniques presented in this document. The apparatus 605 may include a transceiver electronic device 615 for sending and / or receiving wireless signals through one or more communication interfaces such as (multiple) antennas 620. The apparatus 605 may include other communication interfaces for transmitting and receiving data. The device 605 may include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some implementations, the processor electronic device 610 may include at least a portion of the transceiver electronic device 615. In some embodiments, at least some of the disclosed techniques, modules, or functions are implemented using the apparatus 605.

[0120] Some of the embodiments described herein are described in the general context of a method or process, which in one embodiment can be implemented by a computer program product embodied in a computer-readable medium, which includes computer-executable instructions, such as program code, executed by a computer in a network environment. Computer-readable media may include removable and non-removable storage devices, including but not limited to read-only memory (ROM), random access memory (RAM), compact disk (CD), digital versatile disk (DVD), etc. Therefore, computer-readable media may include non-transitory storage media. Typically, program modules may include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. Computer or processor executable instructions, related data structures, and program modules represent examples of program codes for executing the steps of the methods disclosed herein. Such specific sequences of executable instructions or related data structures represent examples of corresponding actions for implementing the functions described in such steps or processes.

[0121] Some of the disclosed embodiments may be implemented as a device or module using hardware circuits, software, or a combination thereof. For example, a hardware circuit implementation may include discrete analog and / or digital components, such as integrated as a part of a printed circuit board. Alternatively or additionally, the disclosed components or modules may be implemented as application specific integrated circuits (ASICs) and / or field programmable gate arrays (FPGAs) devices. Some implementations may additionally or alternatively include a digital signal processor (DSP), which is a dedicated microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functions of the present application. Similarly, various components or subcomponents within each module may be implemented with software, hardware, or firmware. The connection between the modules and / or components within the modules may be provided using any of the connection methods and media known in the art, including but not limited to using appropriate protocols.

[0122] Although this document contains many details, these should not be interpreted as limitations on the scope of the claimed invention or the content that may be claimed, but rather as descriptions of specific features of specific embodiments. Certain features described in this document in the context of separate embodiments may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination. In addition, although features may be described above as working in certain combinations and even initially claimed as such, one or more features may be removed from the claimed combination in some cases, and the claimed combination may involve a sub-combination or a variant of a sub-combination. Similarly, although operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring these operations to be performed in the particular order shown or in sequence, or that all of the operations shown are performed to obtain the desired result.

[0123] Only a few implementations and examples are described, and other implementations, enhancements, and variations can be made based on what is described and illustrated in this disclosure.

Claims

1. A wireless communication method, comprising: A system information block is transmitted by a first network node to a wireless device, wherein the system information block is a system information block of a first type, a system information block of a second type, or a system information block of a third type, wherein the system information block of the first type comprises cell-specific parameters for cell selection or cell reselection by the wireless device, wherein the system information block of the second type comprises parameters for connection establishment or service establishment, and wherein the system information block of the third type comprises parameters associated with a change in system information.

2. The method according to claim 1, further comprising: transmitting, by the first network node, a request for system information to a second network node that is a neighbor of the first network node; as well as The system information associated with the second network node is received from the second network node.

3. The method according to claim 1, further comprising: receiving, by the first network node, system information associated with a second network node from a second network node that is a neighbor of the first network node, The second network node is configured to transmit the system information based on one or more of the following determinations: (a) the second network node is powered on, (b) establishing or re-establishing a connection between the first network node and the second network node, and (c) a change in the system information associated with the second network node.

4. The method of claim 2, wherein the system information block from the first network node includes the system information associated with the second network node.

5. The method of claim 1, wherein the system information includes cell selection related information and network information, wherein the network information configures the wireless device to determine whether a network, a cell, or a neighboring cell is preferred, and wherein the system information also includes at least one of load information, supported service types, antenna information, radio access technology (RAT) information, cell location information, neighboring cell measurement and / or selection priority, network holographic topology information, and layout planning.

6. The method of claim 2, wherein the first network node and the second network node are non-terrestrial network (NTN) nodes, and wherein the system information block is a system information block (SIB).

7. The method of claim 1, wherein the parameters used for connection establishment or service establishment are mobile originated (MO) parameters, including physical random access channel (PRACH) parameters, access barring (AB) parameters, extended access barring (EAB) parameters, or unified access control (UAC) parameters.

8. The method of claim 7, wherein the MO parameters are obtained and / or processed when it is determined that the wireless device is establishing a radio resource control (RRC) connection.

9. The method of claim 1, wherein the parameters in the system information block of the third type are configured to trigger a mobile terminated (MT) service and include a paging control channel (PCCH) parameter.

10. A wireless communication method, comprising: receiving, by a wireless device, a first system information block from a first network node, wherein the first system information block is a system information block of a first type, a system information block of a second type, or a system information block of a third type, wherein the system information block of the first type comprises cell-specific parameters for cell selection or cell reselection by the wireless device, wherein the system information block of the second type comprises parameters for connection establishment or service establishment, and wherein the system information block of the third type comprises parameters associated with a change in system information.

11. The method according to claim 10, wherein the type of the system information block is acquired based on usage timing and / or change probability of the system information blocks of the first type, the second type, and the third type.

12. The method of claim 10, wherein the system information includes cell selection related information and network information, wherein the network information configures the wireless device to determine whether a network, a cell, or a neighboring cell is preferred, and wherein the system information also includes at least one of load information, supported service types, antenna information, radio access technology (RAT) information, cell location information, neighboring cell measurement and / or selection priority, network holographic topology information, and layout planning.

13. The method according to claim 10, further comprising: receiving a second system information block from a second network node; storing the first system information block and the second system information block; as well as Based on the stored system information blocks, a cell reselection procedure is performed.

14. The method according to claim 13, wherein the storing is based on at least one of a system information valid timer, a system information valid start timing, and a system information valid end timing.

15. The method of claim 13, wherein the first network node and the second network node are non-terrestrial network (NTN) nodes, and wherein the system information block is a system information block (SIB).

16. The method of claim 10, wherein the parameters used for connection establishment or service establishment are mobile originated (MO) parameters, including physical random access channel (PRACH) parameters, access barring (AB) parameters, extended access barring (EAB) parameters, or unified access control (UAC) parameters.

17. The method of claim 16, wherein the MO parameters are obtained and / or processed when it is determined that the wireless device is establishing a radio resource control (RRC) connection.

18. The method of claim 1, wherein the parameters in the system information block of the third type are configured to trigger a mobile terminated (MT) service and include a paging control channel (PCCH) parameter.

19. An apparatus for wireless communication, comprising at least one processor and a memory, the memory storing instructions, the instructions being executed by the at least one processor to cause the apparatus to: transmitting a system information block to a wireless device, wherein the system information block is a system information block of a first type, a system information block of a second type, or a system information block of a third type, wherein the system information block of the first type comprises cell-specific parameters for cell selection or cell reselection by the wireless device, wherein the system information block of the second type comprises parameters for connection establishment or service establishment, and wherein the system information block of the third type comprises parameters associated with a change in system information.

20. An apparatus for wireless communication, comprising at least one processor and a memory, the memory storing instructions, the instructions being executed by the at least one processor to cause the apparatus to: receiving a first system information block from a first network node, wherein the first system information block is a system information block of a first type, a system information block of a second type, or a system information block of a third type, wherein the system information block of the first type comprises cell-specific parameters for cell selection or cell reselection by the wireless device, wherein the system information block of the second type comprises parameters for connection establishment or service establishment, and wherein the system information block of the third type comprises parameters associated with a change in system information.

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