On-demand SSB operation for secondary cells
Patent Information
- Application Number
- PCT/CN2024/077206
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-02-14
- Publication Date
- 2025-10-02
AI Technical Summary
User equipment (UE) is unable to determine if a secondary cell is operating as an SSB-less cell or an on-demand SSB cell, leading to uncertainty in network operations and potential failure to perform necessary measurements due to muted synchronization signal blocks (SSBs).
The UE is equipped with processing circuitry to process measurement object configurations, identify on-demand SSB cells, and request SSB transmission, while the network coordinates SSB operations to ensure the UE can perform required measurements.
Enables the UE to accurately determine and request SSB transmission for on-demand SSB cells, ensuring successful network operations and measurements, even in network energy saving modes.
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Figure CN2024077206_02102025_PF_FP_ABST
Abstract
Description
On-Demand SSB Operation for Secondary CellsTECHNICAL FIELD
[0001] The present disclosure generally relates to wireless communication, and in particular, to on-demand SSB operation for secondary cells.BACKGROUND
[0002] Network energy saving (NES) is a mode of operation for New Radio (NR) which reduces signaling and power draw at a base station of the network. NES typically involves a base station muting certain transmissions such as reference signals (RSs) . In one example of a RS, a Synchronization Signal Block (SSB) is an RS transmitted by a base station and used by a user equipment (UE) for time and frequency synchronization with the cell and may also be used for activation of a cell by the UE. Thus, muting of such base station signals may cause the UE to not be able to perform certain operations for the base station.SUMMARY
[0003] Some example embodiments are related to an apparatus having processing circuitry configured to process, based on signals received from a serving cell, a measurement object (MO) configuration to measure one or more neighbor cells for a frequency layer, wherein the MO configuration comprises an indication that the one or more neighbor cells include at least one on-demand synchronization signal block (SSB) cell that is currently not transmitting SSBs, generate, for transmission to the serving cell, a request to turn on SSBs for the at least one on-demand SSB cell, perform measurements for the MO and generate, for transmission to the serving cell, a measurement report corresponding to the MO.
[0004] Other example embodiments are related to an apparatus having processing circuitry configured to process, based on signals received from a serving cell, a configuration related to a target secondary cell (SCell) , evaluate one or more conditions to determine the target SCell is an on-demand synchronization signal block (SSB) SCell that is not currently transmitting SSBs, generate, for transmission to the serving cell, a request to turn on SSBs for the on-demand SSB SCell and perform one or more operations related to the on-demand SSB SCell based on SSBs transmitted by the on-demand SSB SCell.
[0005] Still further example embodiments are related to an apparatus having processing circuitry configured to generate, for transmission to a target user equipment (UE) , a configuration to perform an operation related to an on-demand synchronization signal block (SSB) cell that is not currently transmitting SSBs and generate, for transmission to the on-demand SSB cell, a command to turn on SSB transmission in response to the configuration being transmitted to the target UE.Brief Description of the Drawings
[0006] Fig. 1 shows an example network arrangement according to various example embodiments.
[0007] Fig. 2 shows an example user equipment (UE) according to various example embodiments.
[0008] Fig. 3 shows an example base station according to various example embodiments.
[0009] Fig. 4 shows an example method of network operations related to configuring a UE to perform operations for an on-demand SSB SCell according to various example embodiments.
[0010] Fig. 5 shows an example method of UE operations related to receiving a measurement object (MO) including an on-demand SSB cell according to various example embodiments.
[0011] Fig. 6 shows an example method of UE operations related to receiving a configuration for operations for a target on-demand SSB SCell according to various example embodiments.Detailed Description
[0012] The example embodiments may be further understood with reference to the following description and the related appended drawings, wherein like elements are provided with the same reference numerals. The example embodiments relate to operations performed by the network or a user equipment (UE) related to a secondary cell (SCell) that is configured to operate in NES mode, specifically as an on-demand synchronization signal block (SSB) SCell that may not currently being transmitting SSBs.
[0013] The example embodiments are described with regard to a 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 an accessory device and is configured with the hardware, software, and / or firmware to exchange information and data with accessory devices. Therefore, the UE as described herein is used to represent any electronic component.
[0014] The example embodiments are also described with reference to a 5G New Radio (NR) network. However, the example embodiments may also be implemented in other types of networks, including but not limited to LTE networks, future evolutions of the cellular protocol (e.g., 5G-advanced networks, 6G networks, etc. ) , or any other type of network.
[0015] The example embodiments are described with reference to carrier aggregation (CA) . In CA, a UE may communicate in the downlink (DL) or uplink (UL) with multiple cells of a network to increase throughput. CA includes the UE associating with a Primary Cell (PCell) and one or more Secondary Cells (SCells) . Different band combinations of CA may be served by the PCell and SCell, e.g., the PCell may serve a first component carrier (CC) of a CA band combination (e.g., CC1) to the UE and the SCell may serve a second CC of the CA band combination (e.g., CC2) to the UE.Thus, in CA, both the PCell and the SCell are considered to be serving cells. The example embodiments are described with reference to the network configuring an NES cell as an SCell for a UE.
[0016] As stated above, a network cell operating in NES mode may not transmit SSBs. However, there may two types of NES operations related to muting of SSBs. A first type of NES operation may be referred to as an SSB-less cell. In SSB-less cell operation, the cell is not configured to transmit SSBs and the network will not turn on SSBs for this cell. A second type of NES operation may be referred to as an on-demand SSB cell. In on-demand SSB cell operation, the cell may be currently configured to not transmit SSBs but the network may turn on SSBs for this cell if requested by a UE. Thus, throughout this description, an NES cell may refer to a cell operating as an SSB-less cell or an on-demand SSB cell.
[0017] An issue that arises is that when a UE is configured with an NES cell as an SCell is that the UE may not be aware if the SCell is operating as an SSB-less cell or an on-demand SSB cell. For example, the UE does not understand if the SCell will never transmit SSBs (e.g., SSB-less cell) or that the UE needs to request that the SCell should transmit SSBs (e.g., on-demand SSB cell) .
[0018] Some example embodiments provide operations for a UE to determine if an SCell is an on-demand SCell and for the UE to signal to the network to turn on SSBs for on-demand SCells that are not currently transmitting SSBs. Other example embodiments provide operations for a network to configure a UE to perform operations related to an on-demand SCell and coordinate within the network that the on-demand SCell is transmitting SSBs so that the UE may perform the configured operations. Each of these example embodiments will be described in greater detail below.
[0019] Fig. 1 shows an example network arrangement 100 according to various example embodiments. The example network arrangement 100 includes a UE 110. The UE 110 may be any type of electronic component that is configured to communicate via a network, e.g., mobile phones, tablet computers, desktop computers, smartphones, embedded devices, wearables, Internet of Things (IoT) devices, etc. An actual network arrangement may include any number of UEs being used by any number of users. Thus, the example of one UE 110 is merely provided for illustrative purposes.
[0020] The UE 110 may be configured to communicate with one or more networks. In the example of the network arrangement 100, the network with which the UE 110 may wirelessly communicate is a 5G NR radio access network (RAN) 120. The UE 110 may also communicate with other types of networks (e.g., 5G cloud RAN, a next generation RAN (NG-RAN) , a legacy cellular network, etc. ) and the UE 110 may also communicate with networks over a wired connection. With regard to the example embodiments, the UE 110 may establish a connection with the 5G NR RAN 120. Therefore, the UE 110 may have a 5G NR chipset to communicate with the NR RAN 120.
[0021] The 5G NR RAN 120 may be portions of a cellular network that may be deployed by a network carrier (e.g., Verizon, AT&T, T-Mobile, etc. ) . The RAN 120 may include cells or base stations that are configured to send and receive traffic from UEs that are equipped with the appropriate cellular chip set. In this example, the 5G NR RAN 120 includes the gNB 120A and the gNB 120B. However, reference to a gNB is merely provided for illustrative purposes, any appropriate base station or cell may be deployed (e.g., Node Bs, eNodeBs, HeNBs, eNBs, gNBs, gNodeBs, macrocells, microcells, small cells, femtocells, etc. ) .
[0022] Any association procedure may be performed for the UE 110 to connect to the 5G NR RAN 120. For example, as discussed above, the 5G NR RAN 120 may be associated with a particular network carrier where the UE 110 and / or the user thereof has a contract and credential information (e.g., stored on a S IM card) . Upon detecting the presence of the 5G NR RAN 120, the UE 110 may transmit the corresponding credential information to associate with the 5G NR RAN 120. More specifically, the UE 110 may associate with a specific cell (e.g., gNB 120A) .
[0023] The network arrangement 100 also includes a cellular core network 130, the Internet 140, an IP Multimedia Subsystem (IMS) 150, and a network services backbone 160. The cellular core network 130 manages the traffic that flows between the cellular network and the Internet 140. The IMS 150 may be generally described as an architecture for delivering multimedia services to the UE 110 using the IP protocol. The IMS 150 may communicate with the cellular core network 130 and the Internet 140 to provide the multimedia services to the UE 110. The network services backbone 160 is in communication either directly or indirectly with the Internet 140 and the cellular core network 130. The network services backbone 160 may be generally described as a set of components (e.g., servers, network storage arrangements, etc. ) that implement a suite of services that may be used to extend the functionalities of the UE 110 in communication with the various networks.
[0024] Fig. 2 shows an example UE 110 according to various example embodiments. The UE 110 will be described with regard to the network arrangement 100 of Fig. 1. The UE 110 may represent any electronic device and may include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225, and other components 230. The other components 230 may include, for example, an audio input device, an audio output device, a battery that provides a limited power supply, a data acquisition device, ports to electrically connect the UE 110 to other electronic devices, sensors to detect conditions of the UE 110, etc.
[0025] The processor 205 may be configured to execute a plurality of engines for the UE 110. For example, the engines may include an on-demand SSB engine 235 for performing operations related to on-demand SSB SCells. The operations include, but are not limited to, receiving a configuration from the network indicating that an operation related to an on-demand SSB SCell is to be performed, determining if an SCell is an on-demand SSB SCell and requesting the network to turn on SSBs for the on-demand SSB SCell so the UE may perform the configured operations. Each of these example operations will be described in more detail below.
[0026] The above referenced engine being an application (e.g., a program) executed by the processor 205 is only example. The functionality associated with the engines may also be represented as a separate incorporated component of the UE 110 or may be a modular component coupled to the UE 110, e.g., an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information. The engines may also be embodied as one application or separate applications. In addition, in some UEs, the functionality described for the processor 205 is split among two or more processors such as a baseband processor and an applications processor. The example embodiments may be implemented in any of these or other configurations of a UE.
[0027] The memory arrangement 210 may be a hardware component configured to store data related to operations performed by the UE 110. The display device 215 may be a hardware component configured to show data to a user while the I / O device 220 may be a hardware component that enables the user to enter inputs. The display device 215 and the I / O device 220 may be separate components or integrated together such as a touchscreen.
[0028] The transceiver 225 may be a hardware component configured to establish a connection with the 5G NR-RAN 120, an LTE-RAN (not pictured) , a legacy RAN (not pictured) , a WLAN (not pictured) , etc. Accordingly, the transceiver 225 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . The transceiver 225 includes circuitry configured to transmit and / or receive signals (e.g., control signals, data signals) . Such signals may be encoded with information implementing any one of the methods described herein. The processor 205 may be operably coupled to the transceiver 225 and configured to receive from and / or transmit signals to the transceiver 225. The processor 205 may be configured to encode and / or decode signals (e.g., signaling from a base station of a network) for implementing any one of the methods described herein.
[0029] Fig. 3 shows an example base station 300 according to various example embodiments. The base station 300 may represent the gNB 120A, the gNB 120B or any other access node through which the UE 110 may establish a connection and manage network operations.
[0030] The base station 300 may include a processor 305, a memory arrangement 310, an input / output (I / O) device 315, a transceiver 320, and other components 325. The other components 325 may include, for example, an audio input device, an audio output device, a battery, a data acquisition device, ports to electrically connect the base station 300 to other electronic devices and / or power sources, etc.
[0031] The processor 305 may be configured to execute a plurality of engines for the UE 110. For example, the engines may include an on-demand SSB configuration engine 330 for performing operations related to configuring a UE with operations related to an on-demand SSB SCell. The operations include, but are not limited to, determining a configuration comprising operations for a UE to perform related to an on-demand SSB SCell, indicating to the UE that an SCell is an on-demand SSB SCell and coordinating with the on-demand SSB SCell to turn on SSBs so the UE may perform the configured operations. Each of these example operations will be described in more detail below.
[0032] The memory arrangement 310 may be a hardware component configured to store data related to operations performed by the base station 300. The I / O device 315 may be a hardware component or ports that enable a user to interact with the base station 300. The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UE in the network arrangement 100.
[0033] The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UE in the network arrangement 100. The transceiver 320 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . The transceiver 320 includes circuitry configured to transmit and / or receive signals (e.g., control signals, data signals) . Such signals may be encoded with information implementing any one of the methods described herein. The processor 305 may be operably coupled to the transceiver 320 and configured to receive from and / or transmit signals to the transceiver 320. The processor 305 may be configured to encode and / or decode signals (e.g., signaling from a UE) for implementing any one of the methods described herein.
[0034] As described above, the example embodiments provide methods and signaling for a UE to understand whether an NES SCell is an SSB-less SCell or an on-demand SSB cell. The methods and signaling to allow the UE to understand the distinction between different NES SCells may occur at different times during operation. The example embodiments include methods and signaling at these different times. The example embodiments that are described below for the different times or phases of operation may be implemented on their own or in conj unction with one or more of the methods and signaling described for other times or phases.
[0035] A first example phase may be before SCell configuration, when a measurement object (MO) of a frequency layer has on-demand SSB cells for the UE to measure, e.g., the on-demand SSB cells are included or specified in the MO or the MO includes a frequency layer that the on-demand SSB cells are utilizing. At this phase the cell is not an SCell because the network has not configured the cell as an SCell at this point in time but is rather a neighbor cell that may be measured by the UE for possible use as an SCell. However, for the purposes of this description the cell may still be referred to as an SCell during this phase. Some example embodiments are related to the UE and / or network behavior during this phase.
[0036] A second example phase may be after SCell configuration but before SCell activation, e.g., a configured deactivated SCell. If the deactivated SCell measurement is configured for the UE, some example embodiments are related to the UE and / or network behavior during this phase.
[0037] A third example phase may be after receiving an SCell activation command (or during SCell activation) . The UE may not know if the target being-activated SCell is an SSB-less SCell or is an on-demand SSB SCell without SSB transmission. Some example embodiments are related to the UE and / or network behavior during this phase.
[0038] A fourth example phase may be after SCell activation, if serving cell measurement is configured for the UE. Some example embodiments are related to the UE and / or network behavior during this phase. The example methods and signaling during each of these example phases will be described in greater detail below.
[0039] As stated above, some example embodiments are related to a phase before SCell configuration when the SCell is not a serving cell for the UE, and when the MO of a frequency layer (e.g., this target cell is on this frequency layer) is configured for RRM measurement by the UE. This example embodiment relates to a scenario where there is at least one on-demand SSB cell for the UE to measure for the MO on the frequency layer. In these examples, the on-demand SSB cell / SCell means a cell / SCell SSB is currently turned off but SSB transmissions may be turned on, e.g., based on UE request.
[0040] In a first example, when the network configures the MO on this frequency layer for the UE, the network may coordinate SSB transmissions among cells. For example, a current serving cell (e.g., PCell or SCell) may coordinate with other neighbor cells to turn on the SSB transmissions for the UE to measure. Because the network may have knowledge of the neighbor cells that the UE should measure using the MO, the network is in a position to turn on the SSBs of the neighbor cells in the MO if these neighbor cells are on-demand SSB cells. Thus, in this example, the network may configure the cells such that the UE does not need to request on-demand SSB cells to turn on SSBs. The UE may measure those neighbor cells with SSB transmissions.
[0041] Fig. 4 shows an example method 400 of network operations related to configuring a UE to perform operations for an on-demand SSB SCell according to various example embodiments. The method 400 may be applicable to the first example described above.
[0042] In 410, the network may configure the target UE to perform operations related to an on-demand SSB SCell. In the first example described above, these operations may be measurements for an MO including one or more on-demand SSB cells.
[0043] In 420, because the network has configured the UE to perform operations related to an on-demand SSB SCell, the network coordinates the cells of the network to turn on the SSBs of the on-demand SSB cell so the UE can perform the configured operations. In the first example described above, this may include the serving cell that sent the neighbor cell measurement request for the MO to communicate with the on-demand SSB cell in the MO to turn on the SSBs for UE measurements.
[0044] In a second example, when the network configures the MO on this frequency layer for the UE, the network may provide an indication to the UE related to the on-demand SSB cells. In one option, the indication may indicate to the UE that there are on-demand SSB cells in this MO or on this frequency layer. In another option, the indication may include a neighbor cell list on this frequency layer to indicate the specific cells on the frequency layer that are on-demand SSB cells.
[0045] When the UE receives this information from network, before or when the UE triggers measurement on this MO or frequency layer, the UE may request a serving cell to turn-on SSB transmissions for the on-demand SSB neighbor cells, e.g., the serving cell receives the request from the UE and sends a request via a backhaul link to the on-demand SSB cell to turn on the SSBs. The UE measurement on this MO or frequency layer may be triggered by, for example, a current serving cell quality or other conditions, e.g., the current serving cell quality becomes poor, the UE is in a high mobility state, etc.
[0046] In this example, the on-demand SSB cell may only be requested to turn on the SSB transmissions when the UE is ready to perform the measurements for the MO.
[0047] In a third example, the network may configure the UE in a similar manner as the second example, e.g., when the network configures the MO on this frequency layer for the UE, the network will indicate that there are on-demand SSB cells in this MO or on this frequency layer. In contrast to the above second example, in this third example, instead of waiting for the UE to be triggered to perform the measurements of the MO, the UE may directly or immediately, upon receiving the information from the network, request the serving cell to turn on SSB transmissions for the on-demand SSB neighbor cells.
[0048] Fig. 5 shows an example method 500 of UE operations related to receiving a measurement object (MO) including an on-demand SSB cell according to various example embodiments. The method 500 may be applicable to the second and third examples described above.
[0049] In 510, the UE receives the MO configuration from the network. The network may indicate to the UE that the MO configuration includes at least one on-demand SSB cell for measurement.
[0050] In 520, based on the indication that the MO configuration includes at least one on-demand SSB cell for measurement, the UE may send a request to the network to turn on the SSBs for the on-demand SSB cell (s) in the MO. As described above, in the second example this request may be sent by the UE when the UE is triggered to perform the measurements for the MO. In the third example, this request may be sent by the UE immediately upon receiving the MO that includes on-demand SSB cell (s) .
[0051] In 530, the UE performs the measurements for the MO including the on-demand SSB cells because the SSBs are turned on based on the request sent by the UE in 520. In 540, the UE reports the measurement results, e.g., a measurement report for the MO, to the network.
[0052] The above examples described when the SSB transmissions for the on-demand SSB cell may be turned on. These SSB transmissions for the on-demand SSB cells may also be turned off. For example, the SSB transmissions may be cancelled when the UE receives a de-configuration or release command for the MO. In another example, when the SSB transmissions are turned on, a timer may be started and the SSB transmissions may be cancelled when the timer is expired (e.g., 10 seconds, 20 seconds, etc. ) . The length of the timer may be configured by the network or may be predefined in standards (e.g., 3GPP Technical Specifications) . In a further example, the SSB transmissions may be cancelled when the network indicates such an SSB transmission cancellation to the UE for the target MO or target cell, e.g., the UE may receive, from the network, a first indication that the on-demand SSB cell is turning on SSB transmissions and a second indication that the on-demand SSB cell is turning off SSB transmissions.
[0053] As stated above, a second example phase may be after SCell configuration but before SCell activation, e.g., a configured deactivated SCell. There may be scenarios where the network adds an on-demand SSB SCell for the UE that is not based on UE measurements of the SCell, e.g., the network blindly configures the SCell for the UE. The network may then want to trigger the UE to perform measurements on the deactivated but configured on-demand SSB SCell. These example embodiments relates to this scenario or any scenario where there is a deactivated on-demand SSB SCell for the UE.
[0054] In a first example, a UE may determine that the target SCell is an on-demand SSB SCell based on certain conditions being satisfied. A first condition is that the target SCell is configured for the UE without any SSB configuration, e.g., neither SSB configuration (absoluteFrequencySSB) in the target SCell (FrequencyInfoDL) nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration for the target SCell is configured for the UE. A second condition is that a reference serving cell is not indicated by a higher layer parameter, e.g., SSB-less-Referencecell. A third condition is that a Quasi-Collocated (QCL) -typeC, type D, type A or type B source cell is not configured for the UE for the target SCell. If all these conditions are satisfied, the UE may determine that the target SCell is an on-demand SSB SCell.
[0055] If the UE determines the target SCell is an on-demand SCell and after receiving the deactivated SCell measurement configuration, the UE may send a request to the network to transmit SSBs on the target SCell for the measurement.
[0056] In a second example, a UE may also determine that the target SCell is an on-demand SSB SCell based on certain conditions being satisfied. A first condition is that the target SCell is configured for the UE without any SSB configuration, e.g., neither SSB configuration (absoluteFrequencySSB) in the target SCell (FrequencyInfoDL) nor SMTC configuration for the target SCell is configured for the UE. A second condition is that the network indicates the target SCell is an on-demand SSB SCell or the target SCell is a non-collocated SCell, e.g., an SSB-less cell must be a collocated cell. If all these conditions are satisfied, the UE may determine that the target SCell is an on-demand SSB SCell.
[0057] If the UE determines the target SCell is an on-demand SCell and after receiving the deactivated SCell measurement configuration, the UE may send a request to the network to transmit SSBs on the target SCell for the measurement.
[0058] In a third example, a UE may also determine that the target SCell is an on-demand SSB SCell based on certain conditions being satisfied. A first condition is that the target SCell is configured for the UE with SSB, e.g., SSB configuration (absoluteFrequencySSB) is in the target SCell (FrequencyInfoDL) or SMTC configuration is provided for the target SCell. This is the opposite condition of the first and second examples provided above where the UE is configured without SSBs. A second condition is that the network indicates the target SCell is an on-demand SSB SCell. If all these conditions are satisfied, the UE may determine that the target SCell is an on-demand SSB SCell.
[0059] If the UE determines the target SCell is an on-demand SCell and after receiving the deactivated SCell measurement configuration, the UE may send a request to the network to transmit SSBs on the target SCell for the measurement.
[0060] Fig. 6 shows an example method 600 of UE operations related to receiving a configuration for operations for a target on-demand SSB SCell according to various example embodiments. The method 600 may be applicable to the first through third examples described above.
[0061] In 610, the UE may receive a configuration for the target SCell from the network. In the above examples, the configuration may be related to performing measurements on the deactivated but configured on-demand SSB SCell.
[0062] In 620, the UE determines if the target SCell is an on-demand SSB SCell. The first through third examples above provided some example conditions that may be used for the UE to determine if the target SCell is an on-demand SSB SCell. If the target SCell is not an on-demand SSB SCell, the method 600 may end.
[0063] In 630, if the target SCell is an on-demand SSB SCell, the UE may request the network to turn on the SSBs for the on-demand SSB SCell so the UE may perform the configured operation, e.g., perform measurements on the deactivated but configured on-demand SSB SCell.
[0064] In 640, the UE may perform the configured operation on the target on-demand SSB SCell because the SSBs have been turned on based on the request from the UE in 630.
[0065] In a fourth example, when the network configures the target SCell for the UE or when the network configures SCell measurement for the UE after SCell addition, the network may coordinate to turn on the SSB transmissions for the target SCell for the UE to measure. In this example, the network may perform all the actions and the UE does not need to send a request to the network to turn on the on-demand SSBs because the receipt of the SCell measurement configuration indicates to the UE that the SSBs are being transmitted.
[0066] This fourth example may be related to the method 400 of Fig. 4 described above. For example, the operation of 410 may be the SCell measurement for the UE after SCell addition. In 420, the serving cell that provided the SCell measurement for the UE after SCell addition configuration may send a request to the on-demand SSB SCell to turn on the SSBs for UE measurement.
[0067] Similar to the first phase, in the second phase the above examples described when the SSB transmissions for the on-demand SSB cell may be turned on. These SSB transmissions for the on-demand SSB cells may also be turned off. For example, the SSB transmissions may be cancelled when the UE receives a de-configuration or release command for the SCell. In another example, when the SSB transmissions are turned on, a timer may be started and the SSB transmissions may be cancelled when the timer is expired (e.g., 10 seconds, 20 seconds, etc. ) . The length of the timer may be configured by the network or may be predefined in standards (e.g., 3GPP Technical Specifications) . In a further example, the SSB transmissions may be cancelled when the network indicates such an SSB transmission cancellation to the UE for the SCell, e.g., the UE may receive, from the network, a first indication that the on-demand SSB SCell is turning on SSB transmissions and a second indication that the on-demand SSB SCell is turning off SSB transmissions.
[0068] As stated above, a third example phase may be after receiving the SCell configuration (or addition) and receiving the SCell activation command. There may be scenarios where the network adds an on-demand SSB SCell for the UE that is not based on UE measurements of the SCell, e.g., the network blindly configures the SCell for the UE, and then the network has a large burst of data for the UE and blindly attempts to activate the blindly added SCell, e.g., before receiving any measurement results for the SCell. These example embodiments relates to this scenario or any scenario where there the network is activating an on-demand SSB SCell for the UE.
[0069] In a first example, a UE may determine that the target SCell to be activated is an on-demand SSB SCell based on certain conditions being satisfied. A first condition is that the target SCell is configured for the UE without any SSB configuration, e.g., neither SSB configuration (absoluteFrequencySSB) in the target SCell (FrequencyInfoDL) nor SMTC configuration for the target SCell is configured for the UE. A second condition is that a reference serving cell is not indicated by a higher layer parameter, e.g., SSB-less-Referencecell. A third condition is that a Quasi-Collocated (QCL) -typeC, type D, type A or type B source cell is not configured for the UE for the target SCell. If all these conditions are satisfied, the UE may determine that the target SCell to be activated is an on-demand SSB SCell.
[0070] If the UE determines the target SCell to be activated is an on-demand SCell and after receiving the SCell activation command, the UE may send a request to the network to transmit SSBs on the target SCell to be activated for the SCell activation procedure.
[0071] In a second example, a UE may also determine that the target SCell to be activated is an on-demand SSB SCell based on certain conditions being satisfied. A first condition is that the target SCell is configured for the UE without any SSB configuration, e.g., neither SSB configuration (absoluteFrequencySSB) in the target SCell (FrequencyInfoDL) nor SMTC configuration for the target SCell is configured for the UE. A second condition is that the network indicates the target SCell is an on-demand SSB SCell or the target SCell is a non-collocated SCell, e.g., an SSB-less cell must be a collocated cell. If all these conditions are satisfied, the UE may determine that the target SCell to be activated is an on-demand SSB SCell.
[0072] If the UE determines the target SCell to be activated is an on-demand SCell and after receiving the SCell activation command, the UE may send a request to the network to transmit SSBs on the target SCell to be activated for the SCell activation procedure.
[0073] In a third example, a UE may also determine that the target SCell to be activated is an on-demand SSB SCell based on certain conditions being satisfied. A first condition is that the target SCell is configured for the UE with SSB, e.g., SSB configuration (absoluteFrequencySSB) is in the target SCell (FrequencyInfoDL) or SMTC configuration is provided for the target SCell. This is the opposite condition of the first and second examples provided above where the UE is configured without SSBs. A second condition is that the network indicates the target SCell is an on-demand SSB SCell. If all these conditions are satisfied, the UE may determine that the target SCell to be activated is an on-demand SSB SCell.
[0074] If the UE determines the target SCell to be activated is an on-demand SCell and after receiving the SCell activation command, the UE may send a request to the network to transmit SSBs on the target SCell to be activated for the SCell activation procedure.
[0075] The first through third examples of the third phase may be related to the method 600 of Fig. 6 described above. For example, the configuration received in 610 may be the SCell activation for the UE. The remaining operations of 620, 630 and 640 are similar to those described above, except that the operation performed by the UE in 640 is the SCell activation procedure.
[0076] In a fourth example, when the network sends the SCell activation command to UE for a target SCell to be activated, the network may coordinate to turn on the SSB transmissions for the target SCell to be activated for the SCell activation procedure. In this example, the network may perform all the actions and the UE does not need to send a request to the network to turn on the on-demand SSBs because the receipt of the SCell activation command indicates to the UE that the SSBs are being transmitted.
[0077] This fourth example may be related to the method 400 of Fig. 4 described above. For example, the operation of 410 may be the SCell activation. In 420, the serving cell that provided the SCell activation command to the UE may send a request to the on-demand SSB SCell to turn on the SSBs for the activation procedure of the UE.
[0078] Similar to the first and second phases, in the third phase the above examples described when the SSB transmissions for the on-demand SSB cell to be activated may be turned on. These SSB transmissions for the on-demand SSB cells may also be turned off. For example, the SSB transmissions may be cancelled when the UE receives a deactivation command for the SCell. In another example, when the SSB transmissions are turned on, a timer may be started and the SSB transmissions may be cancelled when the timer is expired. The length of the timer may be configured by the network or may be predefined in standards (e.g., 3GPP Technical Specifications) . In a further example, the SSB transmissions may be cancelled when the network indicates such an SSB transmission cancellation to the UE for the SCell, e.g., the UE may receive, from the network, a first indication that the on-demand SSB SCell is turning on SSB transmissions and a second indication that the on-demand SSB SCell is turning off SSB transmissions.
[0079] As stated above, a fourth example phase may be after the SCell has been activated. During the fourth phase, e.g., when the SCell is activated, the UE will already know the type of the SCell, e.g., on-demand SSB SCell, SSB-less SCell or a normal SCell that is always transmitting SSBs. These example embodiments are related to the scenario where the SCell is activated (e.g., the SCell is a serving cell for the UE) , the UE knows that the SCell is an on-demand SSB SCell and the network configures serving cell measurements for the SCell. There may be various reasons why the on-demand SSB SCell is not currently transmitting SSBs at this point in time. The example embodiments relate to turning on the SSBs for the on-demand SSB SCell in such scenarios.
[0080] In a first example, after the serving cell measurement is configured for the SCell, the UE may send a request to the network to transmit SSBs on the target SCell for the serving cell measurements.
[0081] In a second example, when the network configures the serving cell measurement for the SCell, the network may coordinate to turn on the SSB transmissions for the SCell for the serving cell measurements. In this example, the network may perform all the actions and the UE does not need to send a request to the network to turn on the on-demand SSBs because the receipt of the serving cell measurement for the SCell configuration indicates to the UE that the SSBs are being transmitted.
[0082] Similar to the first through third phases, in the fourth phase the above examples described when the SSB transmissions for the on-demand SSB cell to be activated may be turned on. These SSB transmissions for the on-demand SSB cells may also be turned off. For example, the SSB transmissions may be cancelled when the UE receives a serving cell measurement deactivation / deconfiguration / release command. In another example, when the SSB transmissions are turned on, a timer may be started and the SSB transmissions may be cancelled when the timer is expired. The length of the timer may be configured by the network or may be predefined in standards (e.g., 3GPP Technical Specifications) . In a further example, the SSB transmissions may be cancelled when the network indicates such an SSB transmission cancellation to the UE for the SCell, e.g., the UE may receive, from the network, a first indication that the on-demand SSB SCell is turning on SSB transmissions and a second indication that the on-demand SSB SCell is turning off SSB transmissions.
[0083] In the above examples, a target UE was considered, e.g., the UE that was performing actions with the target SCell such as neighbor cell measurements, SCell activation or SCell measurements. When the target UE requests the network to turn on the SSBs for the on-demand SSB cell, the other UEs in the same coverage area as the target UE may benefit from the knowledge that the on-demand SSB cell is now transmitting SSBs. The following examples described manners for the network to indicate that the SSBs for an on-demand SSB cell have been turned on to the UEs that have not requested the cell turn on the SSBs. These example operations may be performed after the network has turned on the SSB transmissions for the on-demand SSB cell.
[0084] In a first example, the network may broadcast such SSB availability information in the coverage as system information (e.g., System Information Block (SIB) ) or other broadcast information. In one example option, when a serving cell understands that a neighbor on-demand SSB cell has turned on SSBs, the serving cell may broadcast this information to UEs in its coverage area. In another example option, when the on-demand SSB cell has turned on the SSBs, the on-demand SSB cell may broadcast this information to UEs in its coverage area.
[0085] In a second example, the network may provide an indication to radio resource control (RRC) connected UE in the coverage area about the availability of the SSBs from the on-demand SSB cell. This indication may be signaled via RRC messages, Medium Access Control Control Element (MAC-CE) messages, Downlink Control Information (DCI) messages, etc. This indication may be provided on a per UE basis, e.g., by a serving cell to a RRC connected UE.
[0086] In a third example, the network may reconfigure the MO or SCell configuration for other UEs to reflect the SSB availability information, e.g., change the SCell without SSB to SCell with SSB to other UEs in the MO or SCell configuration. This allows the other UEs to know that the on-demand SSB cell is transmitting SSBs.
[0087] Examples
[0088] In a first example, a method comprising processing, based on signals received from a serving cell, a measurement object (MO) configuration to measure one or more neighbor cells for a frequency layer, wherein the MO configuration comprises an indication that the one or more neighbor cells include at least one on-demand synchronization signal block (SSB) cell that is currently not transmitting SSBs, generating, for transmission to the serving cell, a request to turn on SSBs for the at least one on-demand SSB cell, performing measurements for the MO and generating, for transmission to the serving cell, a measurement report corresponding to the MO.
[0089] In a second example, the method of the first example, wherein the MO comprises an explicit indication of the at least one on-demand SSB cell or a frequency layer comprising the at least one on-demand SSB cell.
[0090] In a third example, the method of the first example, wherein the indication comprises a neighbor cell list for the frequency layer to indicate the one or more neighbor cells on the frequency layer that are on-demand SSB cells.
[0091] In a fourth example, the method of the first example, further comprising transmitting the request when measurements for the MO are triggered.
[0092] In a fifth example, the method of the first example, further comprising transmitting the request upon receipt of the indication.
[0093] In a sixth example, the method of the first example, further comprising determining the at least one on-demand SSB cell has ceased transmitting SSBs based on one of (i) receipt of a de-configuration or release command for the MO, (ii) expiration of a timer, or (iii) an explicit indication from the serving cell.
[0094] In a seventh example, a processor configured to perform any of the methods of the first through sixth examples.
[0095] In an eighth example, a user equipment (UE) comprising a transceiver configured to communicate with a base station and a processor communicatively coupled to the transceiver and configured to perform any of the methods of the first through sixth examples.
[0096] In a ninth example, a method comprising processing, based on signals received from a serving cell, a configuration related to a target secondary cell (SCell) , evaluating one or more conditions to determine the target SCell is an on-demand synchronization signal block (SSB) SCell that is not currently transmitting SSBs, generating, for transmission to the serving cell, a request to turn on SSBs for the on-demand SSB SCell and performing one or more operations related to the on-demand SSB SCell based on SSBs transmitted by the on-demand SSB SCell.
[0097] In a tenth example, the method of the ninth example, wherein the configuration comprises a measurement configuration for a deactivated target SCell and the one or more operations comprise performing measurements on the SSBs of the deactivated target SCell.
[0098] In an eleventh example, the method of the tenth example, wherein the one or more conditions comprise (i) the target SCell is configured without SSBs nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, (ii) a reference serving cell is not indicated for the target SCell, and (iii) a quasi-collocated (QCL) source cell is not configured for the target SCell.
[0099] In a twelfth example, the method of the tenth example, wherein the one or more conditions comprise (i) the target SCell is configured without SSBs nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, and (ii) an indication from the serving cell that the target SCell is an on-demand SSB SCell or a non-collocated SCell.
[0100] In a thirteenth example, the method of the tenth example, wherein the one or more conditions comprise (i) the target SCell is configured with SSBs or a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, and (ii) an indication from the serving cell that the target SCell is an on-demand SSB SCell.
[0101] In a fourteenth example, the method of the tenth example, further comprising determining the target SSB SCell has ceased transmitting SSBs based on one of (i) receipt of a de-configuration or release command for the target SCell, (ii) expiration of a timer, or (iii) an explicit indication from the serving cell.
[0102] In a fifteenth example, the method of the ninth example, wherein the configuration comprises a target SCell activation command and the one or more operations comprise performing a SCell activation procedure for the target SCell.
[0103] In a sixteenth example, the method of the fifteenth example, wherein the one or more conditions comprise (i) the target SCell is configured without SSBs nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, (ii) a reference serving cell is not indicated for the target SCell, and (iii) a quasi-collocated (QCL) source cell is not configured for the target SCell.
[0104] In a seventeenth example, the method of the fifteenth example, wherein the one or more conditions comprise (i) the target SCell is configured without SSBs nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, and (ii) an indication from the serving cell that the target SCell is an on-demand SSB SCell or a non-collocated SCell.
[0105] In an eighteenth example, the method of the fifteenth example, wherein the one or more conditions comprise (i) the target SCell is configured with SSBs or a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, and (ii) an indication from the serving cell that the target SCell is an on-demand SSB SCell.
[0106] In a nineteenth example, the method of the fifteenth example, further comprising determining the target SSB SCell has ceased transmitting SSBs based on one of (i) receipt of a deactivation command for the target SCell, (ii) expiration of a timer, or (iii) an explicit indication from the serving cell.
[0107] In a twentieth example, the method of the ninth example, wherein the configuration comprises a serving cell measurement configuration for an activated target SCell and the one or more operations comprise performing measurements on the SSBs of the activated target SCell.
[0108] In a twenty first example, the method of the twentieth example, further comprising determining the target SSB SCell has ceased transmitting SSBs based on one of (i) receipt of a deactivation, de-configuration or release command for the serving cell measurement, (ii) expiration of a timer, or (iii) an explicit indication from the serving cell.
[0109] In a twenty second example, a processor configured to perform any of the methods of the ninth through twenty first examples.
[0110] In a twenty third example, a user equipment (UE) comprising a transceiver configured to communicate with a base station and a processor communicatively coupled to the transceiver and configured to perform any of the methods of the ninth through twenty first examples.
[0111] In a twenty fourth example, a method comprising, generating, for transmission to a target user equipment (UE) , a configuration to perform an operation related to an on-demand synchronization signal block (SSB) cell that is not currently transmitting SSBs and generating, for transmission to the on-demand SSB cell, a command to turn on SSB transmission in response to the configuration being transmitted to the target UE.
[0112] In a twenty fifth example, the method of the twenty fourth example, wherein the configuration comprises a measurement object (MO) comprising an explicit indication of the on-demand SSB cell or a frequency layer comprising the on-demand SSB cell, and the operation comprises performing measurements on the SSBs of the on-demand SSB cell.
[0113] In a twenty sixth example, the method of the twenty fourth example, wherein the configuration comprises a measurement configuration for a deactivated target secondary cell (SCell) , wherein the on-demand SSB cell is the deactivated target SCell and the operation comprises performing measurements on the SSBs of the deactivated target SCell.
[0114] In a twenty seventh example, the method of the twenty fourth example, wherein the configuration comprises a target secondary cell (SCell) activation command for a target SCell, wherein the on-demand SSB cell is the target SCell to be activated and the operation comprises performing an SCell activation procedure for the target SCell.
[0115] In a twenty eighth example, the method of the twenty fourth example, wherein the configuration comprises a serving cell measurement configuration for an activated target secondary cell (SCell) , wherein the on-demand SSB cell is the activated target SCell and the operation comprises performing measurements on the SSBs of the activated target SCell.
[0116] In a twenty ninth example, a processor configured to perform any of the methods of the twenty fourth through twenty eighth examples.
[0117] In a thirtieth example, a user equipment (UE) comprising a transceiver configured to communicate with a base station and a processor communicatively coupled to the transceiver and configured to perform any of the methods of the twenty fourth through twenty eighth examples.
[0118] Those skilled in the art will understand that the above-described example embodiments may be implemented in any suitable software or hardware configuration or combination thereof. An example hardware plat form for implementing the example embodiments may include, for example, an Intel x86 based platform with compatible operating system, a Windows OS, a Mac platform and MAC OS, a mobile device having an operating system such as iOS, Android, etc. The example embodiments of the above described method may be embodied as a program containing lines of code stored on a non-transitory computer readable storage medium that, when compiled, may be executed on a processor or microprocessor.
[0119] Although this application described various embodiments each having different features in various combinations, those skilled in the art will understand that any of the features of one embodiment may be combined with the features of the other embodiments in any manner not specifically disclaimed or which is not functionally or logically inconsistent with the operation of the device or the stated functions of the disclosed embodiments.
[0120] 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.
[0121] It will be apparent to those skilled in the art that various modifications may be made in the present disclosure, without departing from the spirit or the scope of the disclosure. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalent.
Claims
1.An apparatus comprising processing circuitry configured to:process, based on signals received from a serving cell, a measurement object (MO) configuration to measure one or more neighbor cells for a frequency layer, wherein the MO configuration comprises an indication that the one or more neighbor cells include at least one on-demand synchronization signal block (SSB) cell that is currently not transmitting SSBs;generate, for transmission to the serving cell, a request to turn on SSBs for the at least one on-demand SSB cell;perform measurements for the MO; andgenerate, for transmission to the serving cell, a measurement report corresponding to the MO.2.The apparatus of claim 1, wherein the MO comprises an explicit indication of the at least one on-demand SSB cell or a frequency layer comprising the at least one on-demand SSB cell.3.The apparatus of claim 1, wherein the indication comprises a neighbor cell list for the frequency layer to indicate the one or more neighbor cells on the frequency layer that are on-demand SSB cells.4.The apparatus of claim 1, wherein the processing circuitry configures transceiver circuitry to transmit the request when measurements for the MO are triggered.5.The apparatus of claim 1, wherein the processing circuitry configures transceiver circuitry to transmit the request upon receipt of the indication.6.The apparatus of claim 1, wherein the processing circuitry is further configured to:determine the at least one on-demand SSB cell has ceased transmitting SSBs based on one of (i) receipt of a de-configuration or release command for the MO, (ii) expiration of a timer, or (iii) an explicit indication from the serving cell.7.An apparatus comprising processing circuitry configured to:process, based on signals received from a serving cell, a configuration related to a target secondary cell (SCell) ;evaluate one or more conditions to determine the target SCell is an on-demand synchronization signal block (SSB) SCell that is not currently transmitting SSBs;generate, for transmission to the serving cell, a request to turn on SSBs for the on-demand SSB SCell; andperform one or more operations related to the on-demand SSB SCell based on SSBs transmitted by the on-demand SSB SCell.8.The apparatus of claim 7, wherein the configuration comprises a measurement configuration for a deactivated target SCell and the one or more operations comprise performing measurements on the SSBs of the deactivated target SCell.9.The apparatus of claim 8, wherein the one or more conditions comprise (i) the target SCell is configured without SSBs nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, (ii) a reference serving cell is not indicated for the target SCell, and (iii) a quasi-collocated (QCL) source cell is not configured for the target SCell.10.The apparatus of claim 8, wherein the one or more conditions comprise (i) the target SCell is configured without SSBs nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, and (ii) an indication from the serving cell that the target SCell is an on-demand SSB SCell or a non-collocated SCell.11.The apparatus of claim 8, wherein the one or more conditions comprise (i) the target SCell is configured with SSBs or a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, and (ii) an indication from the serving cell that the target SCell is an on-demand SSB SCell.12.The apparatus of claim 8, wherein the processing circuitry is further configured to:determine the target SSB SCell has ceased transmitting SSBs based on one of (i) receipt of a de-configuration or release command for the target SCell, (ii) expiration of a timer, or (iii) an explicit indication from the serving cell.13.The apparatus of claim 7, wherein the configuration comprises a target SCell activation command and the one or more operations comprise performing a SCell activation procedure for the target SCell.14.The apparatus of claim 13, wherein the one or more conditions comprise (i) the target SCell is configured without SSBs nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, (ii) a reference serving cell is not indicated for the target SCell, and (iii) a quasi-collocated (QCL) source cell is not configured for the target SCell.15.The apparatus of claim 13, wherein the one or more conditions comprise (i) the target SCell is configured without SSBs nor a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, and (ii) an indication from the serving cell that the target SCell is an on-demand SSB SCell or a non-collocated SCell.16.The apparatus of claim 13, wherein the one or more conditions comprise (i) the target SCell is configured with SSBs or a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) Block Measurement Timing Configuration (SMTC) configuration, and (ii) an indication from the serving cell that the target SCell is an on-demand SSB SCell.17.The apparatus of claim 13, wherein the processing circuitry is further configured to:determine the target SSB SCell has ceased transmitting SSBs based on one of (i) receipt of a deactivation command for the target SCell, (ii) expiration of a timer, or (iii) an explicit indication from the serving cell.18.The apparatus of claim 7, wherein the configuration comprises a serving cell measurement configuration for an activated target SCell and the one or more operations comprise performing measurements on the SSBs of the activated target SCell.19.The apparatus of claim 18, wherein the processing circuitry is further configured to:determine the target SSB SCell has ceased transmitting SSBs based on one of (i) receipt of a deactivation, de-configuration or release command for the serving cell measurement, (ii) expiration of a timer, or (iii) an explicit indication from the serving cell.20.An apparatus comprising processing circuitry configured to:generate, for transmission to a target user equipment (UE) , a configuration to perform an operation related to an on-demand synchronization signal block (SSB) cell that is not currently transmitting SSBs; andgenerate, for transmission to the on-demand SSB cell, a command to turn on SSB transmission in response to the configuration being transmitted to the target UE.