Measurement reduced cell reselection in on-demand SIB1 NES cell
On-demand SIB1 transmissions with optimized measurement criteria address the issue of power consumption due to continuous neighbor cell measurements, enhancing battery life in wireless communication systems.
Patent Information
- Application Number
- PCT/CN2024/107962
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2026-01-29
AI Technical Summary
Continuous neighbor cell measurements in wireless communication systems lead to increased power consumption in user equipment (UE), which is a significant challenge in maximizing battery life.
Implementing on-demand System Information Block Type 1 (SIB1) transmissions, where UE requests specific neighbor cell information only when necessary, using wake-up signals and optimized measurement criteria to reduce unnecessary cell reselection measurements.
This approach reduces power consumption by minimizing unnecessary radio and processing activity, thereby extending battery life in mobile devices.
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Figure CN2024107962_29012026_PF_FP_ABST
Abstract
Description
MEASUREMENT REDUCED CELL RESELECTION IN ON-DEMAND SIB1 NES CELLTECHNICAL FIELD
[0001] This application relates generally to wireless communication systems, including on-demand SIB1 and avoiding unnecessary neighbor cell measurements.BACKGROUND
[0002] Wireless mobile communication technology uses various standards and protocols to transmit data between a base station and a wireless communication device. Wireless communication system standards and protocols can include, for example, 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) (e.g., 4G) , 3GPP New Radio (NR) (e.g., 5G) , and Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard for Wireless Local Area Networks (WLAN) (commonly known to industry groups as ) .
[0003] As contemplated by the 3GPP, different wireless communication systems' standards and protocols can use various radio access networks (RANs) for communicating between a base station of the RAN (which may also sometimes be referred to generally as a RAN node, a network node, or simply a node) and a wireless communication device known as a user equipment (UE) . 3GPP RANs can include, for example, Global System for Mobile communications (GSM) , Enhanced Data Rates for GSM Evolution (EDGE) RAN (GERAN) , Universal Terrestrial Radio Access Network (UTRAN) , Evolved Universal Terrestrial Radio Access Network (E-UTRAN) , and / or Next-Generation Radio Access Network (NG-RAN) .
[0004] Each RAN may use one or more radio access technologies (RATs) to perform communication between the base station and the UE. For example, the GERAN implements GSM and / or EDGE RAT, the UTRAN implements Universal Mobile Telecommunication System (UMTS) RAT or other 3GPP RAT, the E-UTRAN implements LTE RAT (sometimes simply referred to as LTE) , and NG-RAN implements NR RAT (sometimes referred to herein as 5G RAT, 5G NR RAT, or simply NR) . In certain deployments, the E-UTRAN may also implement NR RAT. In certain deployments, NG-RAN may also implement LTE RAT.
[0005] A base station used by a RAN may correspond to that RAN. One example of an E-UTRAN base station is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted as evolved Node B, enhanced Node B, eNodeB, or eNB) . One example of an NG-RAN base station is a next generation Node B (also sometimes referred to as a g Node B or gNB) .
[0006] A RAN provides its communication services with external entities through its connection to a core network (CN) . For example, E-UTRAN may utilize an Evolved Packet Core (EPC) while NG-RAN may utilize a 5G Core Network (5GC) .
[0007] BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0008] To easily identify the discussion of any particular element or act, the most significant digit or digits in a reference number refer to the figure number in which that element is first introduced.
[0009] FIG. 1 illustrates an example network with a primary cell and multiple Neighboring Enhanced Service (NES) cells in accordance with some embodiments.
[0010] FIG. 2 illustrates a case (referred to herein as case 2) where the OD-SIB1 is obtained from the NES cell in accordance with some embodiments.
[0011] FIG. 3 illustrates a case (referred to herein as case 3) where the OD-SIB1 for the NES cell is obtained from Cell A in accordance with some embodiments.
[0012] FIG. 4 illustrates an example network with a primary cell with coverage that overlays multiple NES cells and some NES cells outside of the coverage of the primary cell in accordance with some embodiments.
[0013] FIG. 5 illustrates an example signal flow diagram of a baseline procedure of on-demand SIB1 in accordance with some embodiments.
[0014] FIG. 6 illustrates another example signal flow diagram of a baseline procedure of on-demand SIB1 in accordance with some embodiments.
[0015] FIG. 7 illustrates an example signal flow diagram for cell reselection using OD-SIB1 case 3 using multiple SIBs for the multiple NES cells in accordance with some embodiments.
[0016] FIG. 8 illustrates an example signal flow diagram for cell reselection using OD-SIB1 case 3 using an SIB with multiple containers for the multiple NES cells in accordance with some embodiments.
[0017] FIG. 9A illustrates an example set of SIBs that that may be used by a primary cell to provide multiple NES cells’ SIB1 in accordance with some embodiments.
[0018] FIG. 9B illustrates an example of SIB that includes multiple containers that may be used by a primary cell to provide multiple NES cells’ SIB1 in accordance with some embodiments.
[0019] FIG. 10 illustrates an example RRC Release message in accordance with some embodiments.
[0020] FIG. 11 illustrates a method performed by a UE, according to embodiments herein.
[0021] FIG. 12 illustrates a method performed by a network node, according to embodiments herein.
[0022] FIG. 13 illustrates an example architecture of a wireless communication system, according to embodiments disclosed herein.
[0023] FIG. 14 illustrates a system for performing signaling between a wireless device and a network device, according to embodiments disclosed herein.DETAILED DESCRIPTION
[0024] Various embodiments are described with regard to a user equipment (UE) . However, reference to a UE is merely provided for illustrative purposes. The example embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and / or firmware to exchange information and data with the network. Therefore, the UE as described herein is used to represent any appropriate electronic component.
[0025] On-demand SIB1 transmissions have been introduced in wireless communication systems to enhance energy efficiency, reduce unnecessary broadcasts, and optimize resource utilization. Traditionally, System Information Block Type 1 (SIB1) is broadcasted regularly by the network node and includes information such as public land mobile network (PLMN) identity, cell identity, and scheduling details for other system information blocks. In an on-demand scenario, the broadcast of SIB1 can be transmitted upon request.
[0026] To support on-demand (OD) SIB1 procedures and signaling method (s) may be developed for UEs in idle / inactive mode. For example, a triggering method by uplink wake-up-signal using an existing signal / channel may be defined. Further, a wake-up- signal configuration provisioning to UE may be defined. Information exchange between network nodes at least for the configuration of wake-up signal may also be defined. Some embodiments herein provide procedures and signaling method (s) for on-demand SIB1.
[0027] FIG. 1 illustrates an example network 102 with a primary cell (e.g., Cell A 108) and multiple Neighboring Enhanced Service (NES) cells (e.g., first NES cell 104 and second NES cell 106) in accordance with some embodiments. As shown, the coverage area of Cell A 108 overlays multiple NES cells. Cell A 108 may provide a broad coverage area that includes several smaller cells (NES cells) within its boundaries. The macro-cell (Cell A 108) can offer extensive coverage, while smaller cells (first NES cell 104 and second NES cell 106) can provide enhanced capacity and service quality in high-demand areas or specific locations such as buildings, parks, or busy streets.
[0028] In some embodiments, Cell A 108 may broadcast an SIB1 and the NES cells may use OD-SIB1. Two different scenarios for a UE to obtain the OD-SIB1 are illustrated in FIG. 2 and FIG. 3. Specifically, FIG. 2 illustrates a case (referred to herein as case 2) where the OD-SIB1 is obtained from the NES cell 204 in accordance with some embodiments. As shown, the UE 202 may obtain a walk-up signal (WUS) configuration in the SIB of Cell A 206. The UE 202 may then send an uplink (UL) WUS (RACH (Random Access Channel) ) to the NES cell 204. In response, the NES cell 204 may transmit the OD-SIB1. The UE 202 may receive the OD-SIB1 in the NES cell 204.
[0029] FIG. 3 illustrates a case (referred to herein as case 3) where the OD-SIB1 for the NES cell 304 is obtained from Cell A 306 in accordance with some embodiments. As shown, the UE 302 may send the UL WUS (RACH) to Cell A 306. In the illustrated embodiment, he UE 302 may also receive the OD-SIB1 transmission of NES cell 304 from Cell A 306. For example, the NES cell 304 can forward its OD-SIB1 to the Cell A 108, and the Cell A 306 can transmit the OD-SIB1 of the NES cell 304 to the UE 302. While the cases of FIG. 2 and FIG. 3 are shown separately, in some embodiments the cases can coexist.
[0030] FIG. 4 illustrates an example network 402with a primary cell (e.g., Cell A 404) with coverage that overlays multiple NES cells (e.g., first NES cell 406 and second NES cell 408) and some NES cells outside of the coverage of the primary cell (e.g., NCell 410, NCell 412, and NCell 414) in accordance with some embodiments. A UE may perform measurements for one or more NES Cells and primary cells for cell reselection. In some wireless communication systems, there may be processes to limit the number of measurements the UE makes.
[0031] Ensuring that the UE does not constantly measure for cell reselection may reduce power consumption. Continuous measurement for cell reselection causes the UE to frequently activate its radio and processing components, leading to higher power consumption. Since one of the primary goals in mobile device design is to maximize battery life, reducing unnecessary measurements helps conserve battery power.
[0032] In some embodiments, the UE may use priority values and thresholds to determine when to perform measurements and when to skip a measurement. For example, a UE may determine the priority value for the frequency of the serving cell and the priority value of the frequency of the target cell. For a inter-frequency or inter-Radio Access Technology (RAT) frequency with a priority value higher than priority value of current frequency, the UE can perform measurements for the inter-frequency or inter-RAT frequency.
[0033] In some embodiments, for an inter-frequency or inter-RAT frequency with a priority value lower than or equal to priority value of current frequency, the UE may or may not perform measurements based on current conditions. For example, if current serving cell’s Reference Signal Received Power (RSRP) is greater than a threshold (e.g., SnonIntraSearchP) and Reference Signal Received Quality (RSRQ) is greater than a second threshold (e.g., SnonIntraSearchQ) , the UE may skip measurements for this frequency. If RSRP or RSRQ are not greater than the thresholds, the UE can perform measurements for the frequency.
[0034] In some embodiments, cell reselection measurements may be reduced based on the spatial relationship of the primary cell and the NES cells. For example, since Cell A 404 has coverage that overlays multiple NES cells, the UE may avoid frequent measurements towards neighbor cells other than Cell A 404 and NES cells within the coverage of Cell A 404 when it camps in NES cell within the coverage of Cell A 404. For example, when the UE camps in the first NES cell 406, the UE may not measure NCell 410, even if the radio condition of NCell 410 is good.
[0035] The UE may also consider different criteria when deciding whether to perform cell reselection. In some embodiments, the UE may perform cell reselection when the following criteria is met. The UE may determine if a target cell meets radio conditions, and whether the target cell is a suitable cell.
[0036] For example, the cell reselection criteria may be met if the frequency priority of the target cell is greater than the serving frequency, if the target cell’s Serving RX Level (Srxlev) is greater than a threshold (e.g., ThreshX, HighP) during a time interval (e.g., TreselectionRAT) , and more than 1 second has elapsed since the UE camped on the current serving cell. In some embodiments, the cell reselection criteria may also be met if the frequency priority of target cell is less than the serving frequency, and Srxlev of the serving cell is less than a threshold (e.g., ThreshServing) , LowP and Srxlev of the target cell is greater than ThreshX, LowP during a time interval TreselectionRAT. In some embodiments, the cell reselection criteria may also be met if frequency priority of target cell is equal to the serving frequency, or it is intra-frequency, R of target cell is greater than R of the serving cell during a time interval TreselectionRAT, and more than 1 second has elapsed since the UE camped on the current serving cell.
[0037] For a target cell who is best ranked cell in serving or target frequency, the UE may determine if it is a suitable cell. A suitable cell may refer to a cell that does not have access restriction for the UE (e.g., barred, reserved, in forbidden tracking area (TA) list) .
[0038] FIG. 5 and FIG. 6 illustrate two possible procedures for triggering a cell reselection for case 2 OD-SIB1 (e.g., UE obtains WUS config in Cell A, sends UL WUS and OD-SIB1 in NES as shown in FIG. 2) . FIG. 5 illustrates an example signal flow diagram 502 of a baseline procedure of on-demand SIB1 in accordance with some embodiments. In the illustrated embodiment, the OD-SIB1 is obtained before cell reselection. The illustrated example provides a baseline procedure of on-demand SIB1 that starts from Cell A 504. Cell A 504 may be a cell that is periodically transmitting at least its own SIB1. The UE may obtain uplink (UL) WUS configuration of the NES cells (e.g., NES cell 508 and NES cell 510) from Cell A 504.
[0039] For example, in the illustrated embodiment, the Cell A 504 sends an SIB 512 to the UE 506. The SIB 512 may include an UL WUS configuration of the NES cells. The UE 506 may identify that a trigger condition 514 of OD-SIB1 for NES Cell 508 or NES Cell 510 is met. While camped on Cell A 504, the UE 506 may obtain (e.g., OD-SIB1 acquisition 516 or OD-SIB1 acquisition 518) OD-SIB1 from one or both of NES cell 508 and NES cell 510.
[0040] The UE 506 may determine 520 if cell reselection criteria to NES cell 508 is met (i.e., best rank and no access restriction) and tart reselection towards it. The UE 506 may camp 522 in NES cell 508, perform 524 UAC and RACH for initial access, and enter 526 RRC connected mode. The UE 506 and the NES cell 508 may transit data 528 to each other.
[0041] FIG. 6 illustrates another example signal flow diagram 602 of a baseline procedure of on-demand SIB1 in accordance with some embodiments. In the illustrated embodiment, the OD-SIB1 is obtained during cell reselection. The illustrated example provides a baseline procedure of on-demand SIB1 that starts from Cell A 604. Cell A 604 may be a cell that is periodically transmitting at least its own SIB1. The UE 606 may obtain UL WUS configuration of the NES cells (e.g., NES cell 608 and NES cell 610) from Cell A 604.
[0042] For example, in the illustrated embodiment, the Cell A 604 sends an SIB 612 to the UE 606. The SIB 612 may include an UL WUS configuration of the NES cells. The UE 606 may evaluate 614 cell reselection criteria based on measurement on SSB of NES cells and access restriction info in UL WUS configuration. The UE 606 may determine 616 that cell reselection criteria to NES Cell 608 is met (e.g., best rank and no access restriction) , and start reselection towards it. The UE 606 may acquire 618 OD-SIB1 from NES cell 608. The UE 606 may camp 620 in NES cell 608, perform 622 UAC and RACH for initial access, and enter 624 RRC connected mode. The UE 606 and the NES cell 608 may transit data 626 to each other.
[0043] While FIG. 5 and FIG. 6 illustrate two possible procedures for cell reselection procedure of case 2 OD-SIB1, some embodiments herein provide cell reselection procedure of Case 3 OD-SIB1 (e.g., FIG. 3) . Some embodiments herein describe when cell reselection (from Cell A to NES cell) is performed for case 3 OD-SIB1. Some embodiments herein describe how case 2 and case 3 can co-exist. Some embodiments herein describe how to avoid unnecessary neighbor cell measurements in both case 2 and case 3.
[0044] FIG. 7 illustrates an example signal flow diagram 702 for cell reselection using OD-SIB1 case 3 (e.g., UE sends UL WUS and OD-SIB1 is received in Cell A as shown in FIG. 3) using multiple SIBs for the multiple NES cells (e.g., NES cell 708 and NES cell 710) in accordance with some embodiments. In the illustrated embodiment, multiple new SIBs are introduced for Cell A 704 that correspond to the NES cells. Because Cell A 704 can cover multiple NES cells (e.g., NES cell 708 and NES cell 710) , some embodiments may map multiple new SIBs to the multiple NES cells. For instance, due to payload size of one SIB (<=2976bit) , multiple NES cells’ SIB1 may be included in different new SIBs of Cell A 704.
[0045] The network (e.g., Cell A 704) may map the new SIBs to the NES cells. Cell A 704 may generate a SIB (SIBx 712) that includes a mapping from NES cell to the new SIB index. For example, SIBx 712 may include a NES cell identifier (e.g., Physical Cell Identifier (PCI) plus frequency or area ID) of each of the NES cells with an index value that indicates a SIB that corresponds to the identifier (e.g., NES cell 1 corresponds SIB30, NES cell 2 corresponds to SIB31) . In some embodiments, the mapping may be one to one (1: 1) . For example, one NES cell SIB1 may correspond one new SIB. In some embodiments, the mapping may be N to one (N: 1) . For example, the SIB1 of N NES cells may be included in one new SIB.
[0046] Regarding UE 706 behavior, the UE 806 may first acquire the SIBx 712 via an OD-SIB procedure or periodical SIB transmission. For example, in some embodiments, the UE may send a request (e.g., an UL WUS) for an OD-SIB that includes SIBx 712, and in response, Cell A 704 may send the UE 706 the OD-SIB that includes SIBx 712. In some embodiments, the SIBx 712 may be included in a periodical SIB transmission broadcast by Cell A 704.
[0047] The UE 706 may evaluate 714 cell reselection criteria based on measurement on SSB of NES cells and access restriction information. The UE 706 may determine 716 that cell reselection criteria to NES Cell 708 is met (e.g., best rank and no access restriction) , and start reselection towards it. The UE 706 may send a request 728 (e.g., UL WUS) to the Cell A 704 for an OD-SIB that includes the SIB1 of NES Cell 708 (e.g., OD-SIB1y 726) . When the UE 706 intends to acquire a NES cell’s SIB1, the UE can, based on the mapping info from SIBx (e.g., NES Cell1 corresponds to SIB30) , acquire the corresponding SIBy 726 via an OD-SIB acquisition procedure from Cell A 704. In some embodiments, when the UE 706 intends to acquire SIB of one specific NES cell, the UE 706 may be expected to already perform neighbor measurement on it and confirm that it meets the cell reselection criteria. Other conditions may also not be excluded. Similar to legacy OD-SIB procedure, after performing measurement, it may be up to UE implementation to decide when to trigger the above two OD-SIB procedures (e.g., on demand SIBx 712 procedure and SIBy 726 procedure) .
[0048] The UE 706 may camp 718 in NES cell 708, perform 720 UAC and RACH for initial access, and enter 722 RRC connected mode. The UE 706 and the NES cell 708 may transit data 724 to each other.
[0049] FIG. 8 illustrates an example signal flow diagram 802 for cell reselection using OD-SIB1 case 3 (e.g., UE sends UL WUS and OD-SIB1 is received in Cell A as shown in FIG. 3) using a SIB with multiple containers for the multiple NES cells (e.g., NES cell 808 and NES cell 810) in accordance with some embodiments. In some embodiments, multiple of the SIB1s of the NES cells overlaid by Cell A may be included in one SIB. For example, the SIBs of the NES cells may be included in one single new SIB of Cell A as multiple containers. To address the payload size issue, the new SIB can be segmented. In some embodiments, the Cell A may use legacy SIB segmentation or a new SIB segmentation approach. For example, in some embodiments different segments of a combined SIB may include different containers for the SIB1s from different NES cells. For instance, segment #0 of the combined SIB may include the association / mapping, segment #1 of the combined SIB may include a container of NES cell#1’s SIB1, segment #2 of the combined SIB may include a container of NES cell#2’s SIB1, etc. A benefit of using multiple containers in a SIB is that the UE can selectively perform the segment reception accordingly.
[0050] The network (e.g., Cell A 804) may map the NES cells SIB1s to different containers of the combined SIB (e.g., SIBx) . For example, the SIBx may include a mapping from a NES cell identifier (either PCI + frequency or area ID) to a corresponding index of container (e.g., NES cell 1 corresponds to container 1, NES cell 2 corresponds to container 2) . In some embodiments, this mapping may be included in SIBx. Multiple containers may be transmitted on-demand in SIBx.
[0051] Regarding UE 806 behavior, the UE 806 may acquire SIBx 812 via legacy OD-SIB procedure to obtain the mapping. For example, in some embodiments, the UE may send a request (e.g., an UL WUS) for an OD-SIB that includes SIBx 812, and in response, Cell A 804 may send the UE 806 the OD-SIB that includes SIBx 812.
[0052] The UE 806 may evaluate 814 cell reselection criteria based on measurement on SSB of NES cells and access restriction information. The UE 806 may determine 816 that cell reselection criteria to NES Cell 808 is met (e.g., best rank and no access restriction) , and start reselection towards it. In some embodiments, when the UE 806 intends to acquire SIB of one specific NES cell, the UE 806 may be expected to already perform neighbor measurement on it and meet the cell reselection criteria. Other condition is not excluded.
[0053] The UE 808 may send a request 828 to the Cell A 804 for an OD-SIB that includes the SIB1 of NES Cell 808 (e.g., OD-SIBx 826 from Cell A with NES cell’s SIB1 in a container) . For example, the UE 806 may acquire an interested NES Cell’s SIB1 via an enhanced Msg 3 OD-SIB to request the corresponding container based on its measurement and the mapping from SIBx. An example enhanced Msg 3 can be:
[0054] The example Msg 3 may include a requested-Container-List element that includes which containers the UE 806 is requesting. The requested container may include the SIB1s for NES Cells that meet cell reselection criteria.
[0055] In some embodiments, when the UE 806 intends to acquire SIB of one specific NES cell, the UE 806 may be expected to already perform neighbor measurement on it and confirm that it meets the cell reselection criteria. Other conditions may also not be excluded. Similar to legacy OD-SIB procedure, after performing measurement, it may be up to UE implementation to decide when to trigger the above two OD-SIB procedures (e.g., on demand OD-SIBx 812 procedure and OD-SIBx 826 procedure) .
[0056] The UE 806 may camp 818 in NES cell 808, perform 820 UAC and RACH for initial access, and enter 822 RRC connected mode. The UE 806 and the NES cell 808 may transit data 824 to each other.
[0057] FIG. 9A illustrates an example set of SIBs 902 that that may be used by a primary cell to provide multiple NES cells’ SIB1 in accordance with some embodiments. For example, the set of SIBs 902 may be used by Cell A 704 in the signal flow diagram 702 of FIG. 7 to provide the UE 706 with OD-SIB1's of the NES cells. As shown, a first SIB (SIB x 904) may include a mapping list. That mapping list may indicate which SIB is associated with which NES cell. For example, in the illustrated embodiment SIB (x+1) 906 incudes SIB1 of NES cell 1 and SIB (x+2) 908 incudes SIB1 of NES cell 2. A UE may selectively request one or more SIB1s from the primary cell based on the mapping list, and the primary cell may send the requested SIBs.
[0058] FIG. 9B illustrates an example of SIB 910 that includes multiple containers that may be used by a primary cell to provide multiple NES cells’ SIB1 in accordance with some embodiments. For example, the SIB 910 may be used by Cell An 804 in the signal flow diagram 802 of FIG. 8 to provide the UE 806 with OD-SIB1’s of the NES cells. As shown, a first segment 912 of the SIB 910 may include a mapping list. That mapping list may indicate which containers are associated with which NES cell. For example, in the illustrated embodiment container 1 914 includes incudes SIB1 of NES cell 1 and container 1 916 incudes SIB1 of NES cell 2. A UE may selectively request one or more containers that include SIB1s based on the mapping list, and the primary cell may send the SIB 910 with the requested containers.
[0059] In some embodiments, based on UE’s measurement reporting, Cell A may select one NES cell, and include its SIB1 in RRCRelease message. The RRC release message can be enhanced by including PCI + frequency of Cell A selected NES cell, and the UE may reselect to the indicated NES cell. For example, FIG. 10 illustrates an example RRCRelease message 1002 in accordance with some embodiments. As shown, the RRCRelease message 1002 may include the frequency 1004 and the PCI 1006 of a NES cell. For instance, the UE may send a measurement report with measurements of one or more NES cells and Cell A may determine a NES cell for the UE to reselect to. The Cell A may include the NES cell information in the RRCRelease message 1002. The UE may receive the RRCRelease message 1002 and reselect to the NES cell indicated in the RRCRelease message 1002.
[0060] In some embodiments, a new SIB (e.g., SIBx) just provides the information of NES cells (e.g., frequency and PCI) for which the cell-A can provide the SIB1. For example, the UE may indicate a requested NES cell index in a system information (SI) request message, and the network may provide the requested NES cell’s SIB1 in the response to the UE (e.g., in Msg 4) . This procedure could be via Msg3 based SI request procedure.
[0061] In some embodiments, a UE may monitor one or more conditions to determine when to trigger reselection to a NES cell. For instance, for OD-SIB1 case 3, the UE may reselect to a NES cell when one or more of the following conditions are met. A first condition may be that the UE has obtained the NES cell’s SIB1 from Cell A via SIBx or RRCRelease message. A second condition may be that the UE is not barred by the NES cell.
[0062] A third condition may be that radio criteria is met. In some embodiment the radio criteria may include determining that the RSRP of the NES cell is greater than a threshold. The threshold may be a newly introduced threshold. If multiple NES cells satisfy the criteria, it may be up to UE implementation to determine which NES cell to select.
[0063] In some embodiments, the radio criteria may be met if the frequency priority of the target cell is greater than the serving frequency, if the target cell’s Serving RX Level (Srxlev) is greater than a threshold (e.g., ThreshX, HighP) during a time interval (e.g., TreselectionRAT) , and more than 1 second has elapsed since the UE camped on the current serving cell. In some embodiments, the cell reselection criteria may also be met if the frequency priority of target cell is less than the serving frequency, and Srxlev of the serving cell is less than a threshold (e.g., ThreshServing) , LowP and Srxlev of the target cell is greater than ThreshX, LowP during a time interval TreselectionRAT. In some embodiments, the cell reselection criteria may also be met if frequency priority of target cell is equal to the serving frequency, or it is intra-frequency, R of target cell is greater than R of the serving cell during a time interval TreselectionRAT, and more than 1 second has elapsed since the UE camped on the current serving cell. In some embodiments, the selected NES cell is best ranked cell in intra-frequency case or best cell in inter-frequency case. If the selected target cell is not NES cell, or no cell satisfies the criteria, the UE may stay in Cell A and initialize initial access for RRC connection.
[0064] In some embodiments, when determining if radio criteria, for NES cell dedicated reselection the UE may only consider the list of NE S cells indicated by Cell A as candidates of cell reselection. The NES cell list may be provided in Cell A’s SIB and invisible to legacy UEs. The UE may select the best ranked NES cell in intra-frequency or best NES cell in inter-frequency case which satisfies the following criteria. The radio criteria may be met if the frequency priority of the target cell is greater than the serving frequency, if the target cell’s Serving RX Level (Srxlev) is greater than a threshold (e.g., ThreshX, HighP) during a time interval (e.g., TreselectionRAT) , and more than 1 second has elapsed since the UE camped on the current serving cell. In some embodiments, the cell reselection criteria may also be met if the frequency priority of target cell is less than the serving frequency, and Srxlev of the serving cell is less than a threshold (e.g., ThreshServing) , LowP and Srxlev of the target cell is greater than ThreshX, LowP during a time interval TreselectionRAT. In some embodiments, the cell reselection criteria may also be met if frequency priority of target cell is equal to the serving frequency, or it is intra-frequency, R of target cell is greater than R of the serving cell during a time interval TreselectionRAT, and more than 1 second has elapsed since the UE camped on the current serving cell. The threshold can be a dedicated one for NES cell list which is different from legacy threshold for legacy cell list. If no NES cell satisfies the criteria, the UE may stay in Cell A and initialize initial access for RRC connection.
[0065] A fourth condition may be that the uplink traffic has arrived, or it is paged by the network. This condition may be optional, and in some embodiments can be configured by the network in Cell A’s SIB (i.e., whether the UE consider this condition or not) . In some embodiments, in Case 2 OD-SIB1, the above conditions 2-4 may be reused as condition to trigger OD-SIB1 in NES cell.
[0066] In some embodiments, case 2 and case 3 for OD-SIB1 can co-exist. That is, a wireless communication system may support both case 2 and case 3 for OD-SIB1. In some embodiments, an explicit indicator can be introduced in Cell A’s SIB to notify the UE whether to apply case 2 or case 3. In some embodiments, an explicit indicator can be introduced in Cell A’s SIB to notify UE whether to apply use SIBx or RRCRelease for case 3. In some embodiments, an explicit indicator can be introduced in Cell A’s SIB to notify UE whether to apply use SIBx or RRCRelease for case 2.
[0067] In some embodiments, the UE can implicitly derive whether case 2 or case 3 applies. For example, the UE may derive which case from the new SIBx status. For instance, if SIB25 is specified for case 2 and SIB26 is specified for case 3, the UE can implicitly derive it from whether SIB25 or SIB26 are broadcast in Cell A.
[0068] In some embodiments, case 2 and case 3 are specified to use different signaling. For example, in some embodiments, case 2 may be supported via SIBx of Cell A, and case 3 may be supported via RRC release message of Cell A, for intra-CU case.
[0069] Some embodiments may employ procedures to avoid unnecessary measurements. Since Cell A coverage overlays multiple NES cells, the UE may avoid frequent measurements towards neighbor cells other than Cell A and NES cells when it camps in NES cell. In some embodiments, when the UE camps in either Cell A or its indicated NES cells, the UE regards the serving frequency as highest priority. Further a measurement trigger rule may be that the UE is allowed not to perform neighbor cell measurements if priority of the serving cell is greater than priority of the neighbor frequency. Because the serving frequency may be regarded as the highest priority, this may allow the UE to skip some measurement.
[0070] In some embodiments, the wireless network may introduce dedicated threshold SnonIntraSearchP_NES and SnonIntraSearchQ_NES to avoid unnecessary measurements. SnonIntraSearchP_NES may be a threshold used by the UE to decide whether to start measurements of non-intra-frequency NES cells based on RSRP (Reference Signal Received Power) . SnonIntraSearchQ_NES may be a threshold used by the UE to decide whether to start measurements of non-intra-frequency NES cells based on RSRQ (Reference Signal Received Quality) . When the UE camps in either Cell A or its indicated NES cells, the UE may monitor RSRQ and RSRP apply these two new thresholds. For example, if the current serving cell RSRP is greater than SnonIntraSearchP_NES and RSRQ is greater than SnonIntraSearchQ_NES, the UE may be allowed to skip neighbor cell measurement. In some embodiments, these two new thresholds may be looser than legacy ones, so that the UE is more likely to be allowed to skip the neighbor cell measurement.
[0071] In some embodiments, a UE may skip neighbor cell measurements based on radio conditions of a serving NES cell and / or Cell A. For example, when the UE camps in NES cell, the UE may check radio condition of its Cell A. In some embodiments, if current serving NES cell’s RSRP is greater than SnonIntraSearchP and RSRQ is greater than SnonIntraSearchQ, or Cell A’s RSRP is greater than SnonIntraSearchP_NES and RSRQ is greater than SnonIntraSearchQ_NES, the UE is allowed to skip neighbor cell measurement.
[0072] In some embodiments, the UE only checks Cell A’s radio condition. For example, in some embodiments if cell A’s RSRP is greater than SnonIntraSearchP_NES and RSRQ is greater than SnonIntraSearchQ_NES, the UE is allowed to skip neighbor cell measurement. This may mean that UE’s coverage relies on Cell A.
[0073] In some embodiments, when the UE transits to IDLE / INACTIVE state from NES cell or Cell A, the UE may regard the frequency of Cell A as a highest priority. This may allow the UE to skip some neighbor cell measurements.
[0074] In some embodiments, embodiments may be combined to allow the UE to skip neighbor cell measurements for multiple reasons. For example, the UE may skip neighbor cell measurements because of one or more of the following reasons: the frequency of Cell A is regarded as highest priority, radio conditions,
[0075] SnonIntraSearchP_NES and SnonIntraSearchQ_NES, and the frequency of the serving cell is regarded as highest priority.
[0076] FIG. 11 illustrates a method 1100 performed by a UE, according to embodiments herein. The illustrated method 1100 includes connecting 1102 with a Cell A (e.g., primary cell) , wherein coverage of the Cell A overlays one or more NES cells. The method 1100 further includes measuring 1104 radio conditions for the one or more NES cells and the Cell A. The method 1100 further includes determining 1106 occurrence of trigger conditions for NES cell reselection. The method 1100 further includes receiving 1108 an on-demand System Information Block Type 1 (OD-SIB1) for a first NES cell of the one or more NES cells from the Cell A. The method 1100 further includes reselecting 1110 to the first NES cell using information in the OD-SIB1 from the Cell A.
[0077] In some embodiments, the method 1100 further comprises acquiring a first SIB via an OD-SIB procedure or periodical SIB transmission, wherein the first SIB comprises a mapping that associates the one or more NES cells to SIB indexes, determining the first NES cell is a best ranked cell of one or more intra-frequency NES cells or the first NES cell is a best cell of one or more inter-frequency NES cells, and sending a request message to the Cell A for a second SIB with an index mapped to the first NES cell, wherein the OD-SIB1 for the first NES cell is included in the second SIB.
[0078] In some embodiments, the method 1100 further comprises acquiring an SIB via an OD-SIB procedure to obtain a mapping between container indexes of the SIB and the one or more NES cells to SIB indexes, determining the first NES cell is a best ranked cell of one or more intra-frequency NES cells or the first NES cell is a best cell of one or more inter-frequency NES cells, and sending a request message to Cell A for a container of the SIB with an index mapped to the first NES cell, wherein the OD-SIB1 for the first NES cell is included in the container.
[0079] In some embodiments, the method 1100 further comprises reporting measurements of the radio conditions to the Cell A, and receiving from the Cell A an RRC Release message that includes the OD-SIB1 for the first NES cell, wherein the first NES cell is selected based on the measurements.
[0080] In some embodiments, the method 1100 further comprises acquiring an SIB via an OD-SIB procedure, wherein the SIB indicates that the Cell A can provide an SIB1 for the one or more NES cells, determining the first NES cell is a best ranked cell of one or more intra-frequency NES cells or the first NES cell is a best cell of one or more inter-frequency NES cells, and sending, to the Cell A, a SI request message comprising a request for the OD-SIB1 for the first NES cell, wherein the OD-SIB1 is received in a response to the SI request message.
[0081] In some embodiments, the method 1100 further comprises determining the first NES cell is a best ranked cell of one or more intra-frequency cells or the first NES cell is a best cell of one or more inter-frequency NES cells, acquiring the OD-SIB1 configuration of the first NES cell from Cell A’s SIB, and sending a request message to the first NES cell for the OD-SIB1, wherein the OD-SIB1 is received in a response to the request message.
[0082] In some embodiments, the method 1100 further comprises determining the first NES cell is a best ranked cell of one or more intra-frequency cells or the first cell is a best cell of the one or more inter-frequency cells, acquiring the OD-SIB1 configuration of the first NES cell from Cell A’s SIB, and sending a request message to the first NES cell for its OD-SIB1, wherein the OD-SIB1 is received in a response to the request message.
[0083] In some embodiments, the method 1100 further comprises determining the first NES cell is a best ranked cell of one or more intra-frequency cells or a first cell is a best cell of the one or more inter-frequency cells, acquiring the OD-SIB1 configuration of the first NES cell from Cell A’s SIB, and sending a request message to the first NES cell for its OD-SIB1, wherein the OD-SIB1 is received in a response to the request message.
[0084] In some embodiments of the method 1100, the UE reselects to the first NES cell when the UE is not barred by the first NES cell, and the UE has obtained the OD-SIB1 for the first NES from the Cell A via an SIB or an RRC Release message; a set of radio criteria is met; or uplink traffic has arrived or the UE is paged.
[0085] In some embodiments, the method 1100 further comprises receiving, from the Cell A, an SIB comprising an indication of whether to request the OD-SIB1 from the Cell A (case 3) or the first NES cell (case 2) . In some such embodiments, the SIB further comprises an indication of whether to use an SIB or an RRC Release for case 3 or case 2.
[0086] In some embodiments of the method 1100, implicitly deriving whether case 2 OD-SIB1 or case 3 OD-SIB1 applies based on an SIB status.
[0087] In some embodiments, the method 1100 further comprises determining whether case 2 OD-SIB1 or case 3 OD-SIB1 applies, wherein the case 2 OD-SIB1 and the case 3 OD-SIB1 use different signaling.
[0088] In some embodiments, the method 1100 further comprises regarding a serving frequency as a highest priority, wherein the UE is allowed to skip performing neighbor cell measurements if a priority of serving cell is greater than a priority of neighbor frequency.
[0089] In some embodiments, the method 1100 further comprises receiving a SnonIntraSearchP_NES threshold and SnonIntraSearchQ_NES threshold, wherein if RSRP of a current serving cell is greater than the SnonIntraSearchP_NES threshold and RSRQ of a current serving cell is greater than the SnonIntraSearchQ_NES the UE is allowed to skip performing neighbor cell measurements.
[0090] In some embodiments of the method 1100, the UE is allowed to skip performing neighbor cell measurements based on radio conditions of the Cell A.
[0091] In some embodiments, the method 1100 further comprises regarding a frequency of the Cell A as a highest priority, wherein the UE is allowed to skip performing neighbor cell measurements if a priority of the Cell A is greater than a priority of neighbor frequency.
[0092] FIG. 12 illustrates a method 1200 performed by a network node, according to embodiments herein. The illustrated method 1200 includes connecting 1202, with a UE, wherein coverage of the network node overlays one or more NES cells. The method 1200 further includes receiving 1204 a measurement report for radio conditions between the UE and the one or more NES cells and the network node. The method 1200 further includes sending 1206 an OD-SIB1 for a first NES cell of the one or more NES cells from the network node.
[0093] In some embodiments, the method 1200 further comprises sending, to the UE, a first SIB via an OD-SIB procedure or periodical SIB transmission, wherein the first SIB comprises a mapping that associates the one or more NES cells to SIB indexes, receiving a request message from the UE for a second SIB with an index mapped to the first NES cell, and sending the second SIB to the UE, wherein the OD-SIB1 for the first NES cell is included in the second SIB.
[0094] In some embodiments, the method 1200 further comprises sending, to the UE, an SIB via an OD-SIB procedure to obtain a mapping between container indexes of the SIB and the one or more NES cells to SIB indexes, receiving a request message from the UE for a container of the SIB with an index mapped to the first NES cell, and sending the SIB with the container to the UE, wherein the OD-SIB1 for the first NES cell is included in the container.
[0095] In some embodiments, the method 1200 further comprises receiving a measurement report of the radio conditions from the UE, selecting he first NES cell is selected based on the measurement report, and sending to the UE an RRC Release message that includes the OD-SIB1 for the first NES cell.
[0096] In some embodiments, the method 1200 further comprises sending, to the UE, an SIB via an OD-SIB procedure, wherein the SIB indicates that the network node can provide an SIB1 for the one or more NES cells, receiving, from the UE, a SI request message comprising a request for the OD-SIB1 for the first NES cell, and sending a response to the UE that includes the OD-SIB1.
[0097] In some embodiments, the method 1200 further comprises sending, to the UE, an SIB comprising an indication of whether to request the OD-SIB1 from the Cell A (case 3) or the first NES cell (case 2) . In some such embodiments, the SIB further comprises an indication of whether to use an SIB or an RRC Release for case 3 or case 2.
[0098] In some embodiments, the method 1200 further comprises using different signaling based on whether case 2 OD-SIB1 or case 3 OD-SIB1 applies.
[0099] In some embodiments, the method 1200 further comprises sending a SnonIntraSearchP_NES threshold and SnonIntraSearchQ_NES threshold, wherein if RSRP of a current serving cell is greater than the SnonIntraSearchP_NES threshold and RSRQ of a current serving cell is greater than the SnonIntraSearchQ_NES the UE is allowed to skip performing neighbor cell measurements.
[0100] FIG. 13 illustrates an example architecture of a wireless communication system 1300, according to embodiments disclosed herein. The following description is provided for an example wireless communication system 1300 that operates in conjunction with the LTE system standards and / or 5G or NR system standards as provided by 3GPP technical specifications.
[0101] As shown by FIG. 13, the wireless communication system 1300 includes UE 1302 and UE 1304 (although any number of UEs may be used) . In this example, the UE 1302 and the UE 1304 are illustrated as smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more cellular networks) , but may also comprise any mobile or non-mobile computing device configured for wireless communication.
[0102] The UE 1302 and UE 1304 may be configured to communicatively couple with a RAN 1306. In embodiments, the RAN 1306 may be NG-RAN, E-UTRAN, etc. The UE 1302 and UE 1304 utilize connections (or channels) (shown as connection 1308 and connection 1310, respectively) with the RAN 1306, each of which comprises a physical communications interface. The RAN 1306 can include one or more base stations (such as base station 1312 and base station 1314) that enable the connection 1308 and connection 1310.
[0103] In this example, the connection 1308 and connection 1310 are air interfaces to enable such communicative coupling, and may be consistent with RAT (s) used by the RAN 1306, such as, for example, an LTE and / or NR.
[0104] In some embodiments, the UE 1302 and UE 1304 may also directly exchange communication data via a sidelink interface 1316. The UE 1304 is shown to be configured to access an access point (shown as AP 1318) via connection 1320. By way of example, the connection 1320 can comprise a local wireless connection, such as a connection consistent with any IEEE 802.11 protocol, wherein the AP 1318 may comprise a router. In this example, the AP 1318 may be connected to another network (for example, the Internet) without going through a CN 1324.
[0105] In embodiments, the UE 1302 and UE 1304 can be configured to communicate using orthogonal frequency division multiplexing (OFDM) communication signals with each other or with the base station 1312 and / or the base station 1314 over a multicarrier communication channel in accordance with various communication techniques, such as, but not limited to, an orthogonal frequency division multiple access (OFDMA) communication technique (e.g., for downlink communications) or a single carrier frequency division multiple access (SC-FDMA) communication technique (e.g., for uplink and ProSe or sidelink communications) , although the scope of the embodiments is not limited in this respect. The OFDM signals can comprise a plurality of orthogonal subcarriers.
[0106] In some embodiments, all or parts of the base station 1312 or base station 1314 may be implemented as one or more software entities running on server computers as part of a virtual network. In addition, or in other embodiments, the base station 1312 or base station 1314 may be configured to communicate with one another via interface 1322. In embodiments where the wireless communication system 1300 is an LTE system (e.g., when the CN 1324 is an EPC) , the interface 1322 may be an X2 interfac e. The X2 interface may be defined between two or more base stations (e.g., two or more eNBs and the like) that connect to an EPC, and / or between two eNBs connecting to the EPC. In embodiments where the wireless communication system 1300 is an NR system (e.g., when CN 1324 is a 5GC) , the interface 1322 may be an Xn interface. The Xn interface is defined between two or more base stations (e.g., two or more gNBs and the like) that connect to 5GC, between a base station 1312 (e.g., a gNB) connecting to 5GC and an eNB, and / or between two eNBs connecting to 5GC (e.g., CN 1324) .
[0107] The RAN 1306 is shown to be communicatively coupled to the CN 1324. The CN 1324 may comprise one or more network elements 1326, which are configured to offer various data and telecommunications services to customers / subscribers (e.g., users of UE 1302 and UE 1304) who are connected to the CN 1324 via the RAN 1306. The components of the CN 1324 may be implemented in one physical device or separate physical devices including components to read and execute instructions from a machine-readable or computer-readable medium (e.g., a non-transitory machine-readable storage medium) .
[0108] In embodiments, the CN 1324 may be an EPC, and the RAN 1306 may be connected with the CN 1324 via an S1 interface 1328. In embodiments, the S1 interface 1328 may be split into two parts, an S1 user plane (S1-U) interface, which carries traffic data between the base station 1312 or base station 1314 and a serving gateway (S-GW) , and the S1-MME interface, which is a signaling interface between the base station 1312 or base station 1314 and mobility management entities (MMEs) .
[0109] In embodiments, the CN 1324 may be a 5GC, and the RAN 1306 may be connected with the CN 1324 via an NG interface 1328. In embodiments, the NG interface 1328 may be split into two parts, an NG user plane (NG-U) interface, which carries traffic data between the base station 1312 or base station 1314 and a user plane function (UPF) , and the S1 control plane (NG-C) interface, which is a signaling interface between the base station 1312 or base station 1314 and access and mobility management functions (AMFs) .
[0110] Generally, an application server 1330 may be an element offering applications that use internet protocol (IP) bearer resources with the CN 1324 (e.g., packet switched data services) . The application server 1330 can also be configured to support one or more communication services (e.g., VoIP sessions, group communication sessions, etc. ) for the UE 1302 and UE 1304 via the CN 1324. The application server 1330 may communicate with the CN 1324 through an IP communications interface 1332.
[0111] FIG. 14 illustrates a system 1400 for performing signaling 1434 between a wireless device 1402 and a network device 1418, according to embodiments disclosed herein. The system 1400 may be a portion of a wireless communications system as herein described. The wireless device 1402 may be, for example, a UE of a wireless communication system. The network device 1418 may be, for example, a base station (e.g., an eNB or a gNB) of a wireless communication system.
[0112] The wireless device 1402 may include one or more processor (s) 1404. The processor (s) 1404 may execute instructions such that various operations of the wireless device 1402 are performed, as described herein. The processor (s) 1404 may include one or more baseband processors implemented using, for example, a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
[0113] The wireless device 1402 may include a memory 1406. The memory 1406 may be a non-transitory computer-readable storage medium that stores instructions 1408 (which may include, for example, the instructions being executed by the processor (s) 1404) . The instructions 1408 may also be referred to as program code or a computer program. The memory 1406 may also store data used by, and results computed by, the processor (s) 1404.
[0114] The wireless device 1402 may include one or more transceiver (s) 1410 that may include radio frequency (RF) transmitter circuitry and / or receiver circuitry that use the antenna (s) 1412 of the wireless device 1402 to facilitate signaling (e.g., the signaling 1434) to and / or from the wireless device 1402 with other devices (e.g., the network device 1418) according to corresponding RATs.
[0115] The wireless device 1402 may include one or more antenna (s) 1412 (e.g., one, two, four, or more) . For embodiments with multiple antenna (s) 1412, the wireless device 1402 may leverage the spatial diversity of such multiple antenna (s) 1412 to send and / or receive multiple different data streams on the same time and frequency resources. This behavior may be referred to as, for example, multiple input multiple output (MIMO) behavior (referring to the multiple antennas used at each of a transmitting device and a receiving device that enable this aspect) . MIMO transmissions by the wireless device 1402 may be accomplished according to precoding (or digital beamforming) that is applied at the wireless device 1402 that multiplexes the data streams across the antenna (s) 1412 according to known or assumed channel characteristics such that each data stream is received with an appropriate signal strength relative to other streams and at a desired location in the spatial domain (e.g., the location of a receiver associated with that data stream) . Certain embodiments may use single user MIMO (SU-MIMO) methods (where the data streams are all directed to a single receiver) and / or multi user MIMO (MU-MIMO) methods (where individual data streams may be directed to individual (different) receivers in different locations in the spatial domain) .
[0116] In certain embodiments having multiple antennas, the wireless device 1402 may implement analog beamforming techniques, whereby phases of the signals sent by the antenna (s) 1412 are relatively adjusted such that the (joint) transmission of the antenna (s) 1412 can be directed (this is sometimes referred to as beam steering) .
[0117] The wireless device 1402 may include one or more interface (s) 1414. The interface (s) 1414 may be used to provide input to or output from the wireless device 1402. For example, a wireless device 1402 that is a UE may include interface (s) 1414 such as microphones, speakers, a touchscreen, buttons, and the like in order to allow for input and / or output to the UE by a user of the UE. Other interfaces of such a UE may be made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver (s) 1410 / antenna (s) 1412 already described) that allow for communication between the UE and other devices and may operate according to known protocols (e.g., and the like) .
[0118] The wireless device 1402 may include a cell reselection module 1416. The cell reselection module 1416 may be implemented via hardware, software, or combinations thereof. For example, the cell reselection module 1416 may be implemented as a processor, circuit, and / or instructions 1408 stored in the memory 1406 and executed by the processor (s) 1404. In some examples, the cell reselection module 1416 may be integrated within the processor (s) 1404 and / or the transceiver (s) 1410. For example, the cell reselection module 1416 may be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the processor (s) 1404 or the transceiver (s) 1410.
[0119] The cell reselection module 1416 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-13.
[0120] The network device 1418 may include one or more processor (s) 1420. The processor (s) 1420 may execute instructions such that various operations of the network device 1418 are performed, as described herein. The processor (s) 1420 may include one or more baseband processors implemented using, for example, a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
[0121] The network device 1418 may include a memory 1422. The memory 1422 may be a non-transitory computer-readable storage medium that stores instructions 1424 (which may include, for example, the instructions being executed by the processor (s) 1420) . The instructions 1424 may also be referred to as program code or a computer program. The memory 1422 may also store data used by, and results computed by, the processor (s) 1420.
[0122] The network device 1418 may include one or more transceiver (s) 1426 that may include RF transmitter circuitry and / or receiver circuitry that use the antenna (s) 1428 of the network device 1418 to facilitate signaling (e.g., the signaling 1434) to and / or from the network device 1418 with other devices (e.g., the wireless device 1402) according to corresponding RATs.
[0123] The network device 1418 may include one or more antenna (s) 1428 (e.g., one, two, four, or more) . In embodiments having multiple antenna (s) 1428, the network device 1418 may perform MIMO, digital beamforming, analog beamforming, beam steering, etc., as has been described.
[0124] The network device 1418 may include one or more interface (s) 1430. The interface (s) 1430 may be used to provide input to or output from the network device 1418. For example, a network device 1418 that is a base station may include interface (s) 1430 made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver (s) 1426 / antenna (s) 1428 already described) that enables the base station to communicate with other equipment in a core network, and / or that enables the base station to communicate with external networks, computers, databases, and the like for purposes of operations, administration, and maintenance of the base station or other equipment operably connected thereto.
[0125] The network device 1418 may include an OD-SIB1 module 1432. The OD-SIB1 module 1432 may be implemented via hardware, software, or combinations thereof. For example, the OD-SIB1 module 1432 may be implemented as a processor, circuit, and / or instructions 1424 stored in the memory 1422 and executed by the processor (s) 1420. In some examples, the OD-SIB1 module 1432 may be integrated within the processor (s) 1420 and / or the transceiver (s) 1426. For example, the OD-SIB1 module 1432 may be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the processor (s) 1420 or the transceiver (s) 1426.
[0126] The OD-SIB1 module 1432 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-13.
[0127] Embodiments contemplated herein include an apparatus comprising means to perform one or more elements of the method 1100. This apparatus may be, for example, an apparatus of a UE (such as a wireless device 1402 that is a UE, as described herein) .
[0128] Embodiments contemplated herein include one or more non-transitory computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform one or more elements of the method 1100. This non-transitory computer-readable media may be, for example, a memory of a UE (such as a memory 1406 of a wireless device 1402 that is a UE, as described herein) .
[0129] Embodiments contemplated herein include an apparatus comprising logic, modules, or circuitry to perform one or more elements of the method 1100. This apparatus may be, for example, an apparatus of a UE (such as a wireless device 1402 that is a UE, as described herein) .
[0130] Embodiments contemplated herein include an apparatus comprising: one or more processors and one or more computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of the method 1100. This apparatus may be, for example, an apparatus of a UE (such as a wireless device 1402 that is a UE, as described herein) .
[0131] Embodiments contemplated herein include a signal as described in or related to one or more elements of the method 1100.
[0132] Embodiments contemplated herein include a computer program or computer program product comprising instructions, wherein execution of the program by a processor is to cause the processor to carry out one or more elements of the method 1100. The processor may be a processor of a UE (such as a processor (s) 1404 of a wireless device 1402 that is a UE, as described herein) . These instructions may be, for example, located in the processor and / or on a memory of the UE (such as a memory 1406 of a wireless device 1402 that is a UE, as described herein) .
[0133] Embodiments contemplated herein include an apparatus comprising means to perform one or more elements of the method 1200. This apparatus may be, for example, an apparatus of a base station (such as a network device 1418 that is a base station, as described herein) .
[0134] Embodiments contemplated herein include one or more non-transitory computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform one or more elements of the method 1200. This non-transitory computer-readable media may be, for example, a memory of a base station (such as a memory 1422 of a network device 1418 that is a base station, as described herein) .
[0135] Embodiments contemplated herein include an apparatus comprising logic, modules, or circuitry to perform one or more elements of the method 1200. This apparatus may be, for example, an apparatus of a base station (such as a network device 1418 that is a base station, as described herein) .
[0136] Embodiments contemplated herein include an apparatus comprising: one or more processors and one or more computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of the method 1200. This apparatus may be, for example, an apparatus of a base station (such as a network device 1418 that is a base station, as described herein) .
[0137] Embodiments contemplated herein include a signal as described in or related to one or more elements of the method 1200.
[0138] Embodiments contemplated herein include a computer program or computer program product comprising instructions, wherein execution of the program by a processing element is to cause the processing element to carry out one or more elements of the method 1200. The processor may be a processor of a base station (such as a processor (s) 1420 of a network device 1418 that is a base station, as described herein) . These instructions may be, for example, located in the processor and / or on a memory of the base station (such as a memory 1422 of a network device 1418 that is a base station, as described herein) .
[0139] For one or more embodiments, at least one of the components set forth in one or more of the preceding figures may be configured to perform one or more operations, techniques, processes, and / or methods as set forth herein. For example, a baseband processor as described herein in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein. For another example, circuitry associated with a UE, base station, network element, etc. as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein.
[0140] Any of the above described embodiments may be combined with any other embodiment (or combination of embodiments) , unless explicitly stated otherwise. The foregoing description of one or more implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of embodiments to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various embodiments.
[0141] Embodiments and implementations of the systems and methods described herein may include various operations, which may be embodied in machine-executable instructions to be executed by a computer system. A computer system may include one or more general-purpose or special-purpose computers (or other electronic devices) . The computer system may include hardware components that include specific logic for performing the operations or may include a combination of hardware, software, and / or firmware.
[0142] It should be recognized that the systems described herein include descriptions of specific embodiments. These embodiments can be combined into single systems, partially combined into other systems, split into multiple systems or divided or combined in other ways. In addition, it is contemplated that parameters, attributes, aspects, etc. of one embodiment can be used in another embodiment. The parameters, attributes, aspects, etc. are merely described in one or more embodiments for clarity, and it is recognized that the parameters, attributes, aspects, etc. can be combined with or substituted for parameters, attributes, aspects, etc. of another embodiment unless specifically disclaimed herein.
[0143] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.
[0144] Although the foregoing has been described in some detail for purposes of clarity, it will be apparent that certain changes and modifications may be made without departing from the principles thereof. It should be noted that there are many alternative ways of implementing both the processes and apparatuses described herein. Accordingly, the present embodiments are to be considered illustrative and not restrictive, and the description is not to be limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.
Claims
1.A method performed by a user equipment (UE) , the method comprising:connecting with a primary cell, wherein coverage of the primary cell overlays one or more Neighboring Enhanced Service (NES) cells;measuring radio conditions for the one or more NES cells and the primary cell;determining occurrence of trigger conditions for NES cell reselection;receiving an on-demand System Information Block Type 1 (OD-SIB1) for a first NES cell of the one or more NES cells from the primary cell; andreselecting to the first NES cell using information in the OD-SIB1 from the primary cell.2.The method of claim 1, further comprising:acquiring a first SIB via an OD-SIB procedure or periodical SIB transmission, wherein the first SIB comprises a mapping that associates the one or more NES cells to SIB indexes;determining the first NES cell is a best ranked cell of one or more intra-frequency NES cells or the first NES cell is a best cell of one or more inter-frequency NES cells; andsending a request message to the primary cell for a second SIB with an index mapped to the first NES cell, wherein the OD-SIB1 for the first NES cell is included in the second SIB.3.The method of claim 1, further comprising:acquiring an SIB via an OD-SIB procedure to obtain a mapping between container indexes of the SIB and the one or more NES cells to SIB indexes;determining the first NES cell is a best ranked cell of one or more intra-frequency NES cells or the first NES cell is a best cell of one or more inter-frequency NES cells; andsending a request message to the primary cell for a container of the SIB with an index mapped to the first NES cell, wherein the OD-SIB1 for the first NES cell is included in the container.4.The method of claim 1, further comprising:reporting measurements of the radio conditions to the primary cell; andreceiving from the primary cell a Radio Resource Control (RRC) Release message that includes the OD-SIB1 for the first NES cell, wherein the first NES cell is selected based on the measurements.5.The method of claim 1, further comprising:acquiring an SIB via an OD-SIB procedure, wherein the SIB indicates that the primary cell can provide an SIB1 for the one or more NES cells;determining the first NES cell is a best ranked cell of one or more intra-frequency NES cells or the first NES cell is a best cell of one or more inter-frequency NES cells; andsending, to the primary cell, a system information (SI) request message comprising a request for the OD-SIB1 for the first NES cell, wherein the OD-SIB1 is received in a response to the SI request message.6.The method of claim 1, further comprising:determining the first NES cell is a best ranked cell of one or more intra-frequency cells or the first NES cell is a best cell of one or more inter-frequency NES cells;acquiring the OD-SIB1 configuration of the first NES cell from primary cell’s SIB; andsending a request message to the first NES cell for the OD-SIB1, wherein the OD-SIB1 is received in a response to the request message.7.The method of claim 1, further comprising:determining the first NES cell is a best ranked cell of one or more intra-frequency cells or the first cell is a best cell of the one or more inter-frequency cells;acquiring the OD-SIB1 configuration of the first NES cell from primary cell’s SIB; andsending a request message to the first NES cell for its OD-SIB1, wherein the OD-SIB1 is received in a response to the request message.8.The method of claim 1, further comprising:determining the first NES cell is a best ranked cell of one or more intra-frequency cells or a first cell is a best cell of the one or more inter-frequency cells;acquiring the OD-SIB1 configuration of the first NES cell from primary cell’s SIB; andsending a request message to the first NES cell for its OD-SIB1, wherein the OD-SIB1 is received in a response to the request message.9.The method of claim 1, wherein the UE reselects to the first NES cell when the UE is not barred by the first NES cell, and the UE has obtained the OD-SIB1 for the first NES from the primary cell via an SIB or an RRC Release message; a set of radio criteria is met; or uplink traffic has arrived or the UE is paged.10.The method of claim 1, further comprising receiving, from the primary cell, an SIB comprising an indication of whether to request the OD-SIB1 from the primary cell (case 3) or the first NES cell (case 2) .11.The method of claim 10, wherein the SIB further comprises an indication of whether to use an SIB or an RRC Release for case 3 or case 2.12.The method of claim 1, implicitly deriving whether case 2 OD-SIB1 or case 3 OD-SIB1 applies based on an SIB status.13.The method of claim 1, further comprising determining whether case 2 OD-SIB1 or case 3 OD-SIB1 applies, wherein the case 2 OD-SIB1 and the case 3 OD-SIB1 use different signaling.14.The method of claim 1, further comprising regarding a serving frequency as a highest priority, wherein the UE is allowed to skip performing neighbor cell measurements if a priority of serving cell is greater than a priority of neighbor frequency.15.The method of claim 1, further comprising receiving a SnonIntraSearchP_NES threshold and SnonIntraSearchQ_NES threshold, wherein if RSRP of a current serving cell is greater than the SnonIntraSearchP_NES threshold and RSRQ of a current serving cell is greater than the SnonIntraSearchQ_NES the UE is allowed to skip performing neighbor cell measurements.16.The method of claim 1, wherein the UE is allowed to skip performing neighbor cell measurements based on radio conditions of the primary cell.17.The method of claim 1, further comprising regarding a frequency of the primary cell as a highest priority, wherein the UE is allowed to skip performing neighbor cell measurements if a priority of the primary cell is greater than a priority of neighbor frequency.18.A method performed by a network node, the method comprising:connecting with a user equipment (UE) , wherein coverage of the network node overlays one or more Neighboring Enhanced Service (NES) cells;receiving a measurement report for radio conditions between the UE and the one or more NES cells and the network node; andsending an on-demand System Information Block Type 1 (OD-SIB1) for a first NES cell of the one or more NES cells from the network node.19.The method of claim 18, further comprising:sending, to the UE, a first SIB via an OD-SIB procedure or periodical SIB transmission, wherein the first SIB comprises a mapping that associates the one or more NES cells to SIB indexes;receiving a request message from the UE for a second SIB with an index mapped to the first NES cell; andsending the second SIB to the UE, wherein the OD-SIB1 for the first NES cell is included in the second SIB.20.The method of claim 18, further comprising:sending, to the UE, an SIB via an OD-SIB procedure to obtain a mapping between container indexes of the SIB and the one or more NES cells to SIB indexes;receiving a request message from the UE for a container of the SIB with an index mapped to the first NES cell; andsending the SIB with the container to the UE, wherein the OD-SIB1 for the first NES cell is included in the container.21.The method of claim 18, further comprising:receiving a measurement report of the radio conditions from the UE;selecting he first NES cell is selected based on the measurement report; andsending to the UE a Radio Resource Control (RRC) Release message that includes the OD-SIB1 for the first NES cell.22.The method of claim 18, further comprising:sending, to the UE, an SIB via an OD-SIB procedure, wherein the SIB indicates that the network node can provide an SIB1 for the one or more NES cells;receiving, from the UE, a system information (SI) request message comprising a request for the OD-SIB1 for the first NES cell; andsending a response to the UE that includes the OD-SIB1.23.The method of claim 18, further comprising sending, to the UE, an SIB comprising an indication of whether to request the OD-SIB1 from the primary cell (case 3) or the first NES cell (case 2) .24.The method of claim 23, wherein the SIB further comprises an indication of whether to use an SIB or an RRC Release for case 3 or case 2.25.The method of claim 18, further comprising using different signaling based on whether case 2 OD-SIB1 or case 3 OD-SIB1 applies.26.The method of claim 18, further comprising sending a SnonIntraSearchP_NES threshold and SnonIntraSearchQ_NES threshold, wherein if RSRP of a current serving cell is greater than the SnonIntraSearchP_NES threshold and RSRQ of a current serving cell is greater than the SnonIntraSearchQ_NES the UE is allowed to skip performing neighbor cell measurements.27.An apparatus comprising means to perform the method of any of claim 1 to claim 26.28.A computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform the method of any of claim 1 to claim 26.29.A computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform the method of any of claim 1 to claim 26.30.An apparatus comprising logic, modules, or circuitry to perform the method of any of claim 1 to claim 26.31.A system for providing wireless communication comprising means to perform the method of any of claim 1 to claim 26.32.A baseband processor for a user equipment (UE) that is configured to cause the UE to perform one or more elements of the method of any of claims 1-17.33.A baseband processor for a base station that is configured to cause the base station to perform one or more elements of the method of any of claims 18-26.
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