On-demand SSB operation after NES secondary cell activation command
By implementing processing circuitry for managing OD-SSB secondary cell activation and using specific signaling protocols, the challenges of inefficient SSB operations in network energy saving modes are addressed, enhancing power efficiency and resource utilization in wireless communication systems.
Patent Information
- Application Number
- PCT/CN2024/106828
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2026-01-29
AI Technical Summary
Existing wireless communication systems face challenges in managing on-demand SSB operations for secondary cells during network energy saving modes, particularly in determining the timing and signaling for SSB transmission and activation, leading to inefficiencies in power usage and resource allocation.
The implementation of processing circuitry in user equipment (UE) and base stations to manage on-demand synchronization signal block (OD-SSB) secondary cell activation, including determining OD-SSB transmission timing, performing RF adjustments, and using specific signaling protocols like MAC-CE to activate or deactivate OD-SSBs, thereby optimizing SSB operations.
Enhances power efficiency and resource utilization by optimizing SSB operations in network energy saving modes, reducing unnecessary power consumption and resource wastage during SSB transmission.
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Figure CN2024106828_29012026_PF_FP_ABST
Abstract
Description
On-Demand SSB Operation After NES Secondary Cell Activation CommandTECHNICAL FIELD
[0001] The present disclosure generally relates to wireless communication, and in particular, to on-demand SSB operation after NES secondary cell activation command.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.
[0003] In some scenarios, a type of NES operation at a base station may be referred to as an on-demand SSB (OD-SSB) cell. In OD-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.SUMMARY
[0004] Some example embodiments are related to an apparatus having processing circuitry configured to process, based on signaling received from a network, an activation command to activate an on-demand synchronization signal block (OD-SSB) secondary cell (SCell) , determine the OD-SSB SCell is transmitting OD-SSBs and activate the OD-SSB SCell based on one or more OD-SSBs.
[0005] Other example embodiments are related to an apparatus having processing circuitry configured to process, based on signaling received from a network, an activation command to activate an on-demand synchronization signal block (OD-SSB) secondary cell (SCell) , process, based on signaling received from the network, an OD-SSB indication indicating the OD-SSB SCell is transmitting OD-SSBs and activate the OD-SSB SCell based on one or more OD-SSBs.
[0006] Still further example embodiments are related to an apparatus having processing circuitry configured to generate, for transmission to a user equipment (UE) , an activation command to activate an on-demand synchronization signal block (OD-SSB) secondary cell (SCell) and generate, for transmission to the UE, an OD-SSB indication indicating the OD-SSB SCell is transmitting OD-SSBs.Brief Description of the Drawings
[0007] Fig. 1 shows an example network arrangement according to various example embodiments.
[0008] Fig. 2 shows an example user equipment (UE) according to various example embodiments.
[0009] Fig. 3 shows an example base station according to various example embodiments.
[0010] Fig. 4 shows an example timeline related to Secondary Cell (SCell) activation and an on-demand SSB (OD-SSB) indication according to various example embodiments.
[0011] Fig. 5 shows an example fixed size MAC-CE for indicating the activation / deactivation of OD-SSBs for an SCell according to various example embodiments.
[0012] Fig. 6 shows an example variable size MAC-CE for indicating the activation / deactivation of OD-SSBs for an SCell according to various example embodiments.
[0013] Fig. 7 shows an example long format fixed size MAC-CE for indicating the activation / deactivation of OD-SSBs for an SCell according to various example embodiments.
[0014] Fig. 8 shows an example long format variable size MAC-CE for indicating the activation / deactivation of OD-SSBs for an SCell according to various example embodiments.
[0015] Fig. 9 shows an example method for a UE activating an OD-SSB SCell according to various example embodiments.Detailed Description
[0016] 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 configuring a UE with indications for activating and / or deactivating an OD-SSB SCell and operations that the UE performs to activate / deactivate the OD-SSB SCell.
[0017] 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.
[0018] 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.
[0019] 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.
[0020] As stated above, a network cell operating in NES mode may not transmit SSBs. One type of NES operation may be referred to as an on-demand SSB (OD-SSB) cell. In OD-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.
[0021] When a UE requests on-demand SSBs, the UE may expect that an on-demand SSB burst (s) is transmitted from a time instance A that may be determined as follows: Time instance A is a slot boundary of the first SSB time domain position of an actually transmitted on-demand SSB burst which is a time T (e.g., slots or symbols) after the slot or symbol where the UE receives signaling from the base station to indicate on-demand SSB transmission. The SSB time domain positions of on-demand SSB bursts may be configured by the base station.
[0022] This expectation on the part of the UE may raise multiple issues such as the details of the value of T (≥ 0) that may include the possibility of T comprising multiple components, whether the value of T is predefined or indicated / configured by the base station, the details regarding the slot or symbol where the UE receives signaling from the base station, the slot or symbol where the UE transmits a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) corresponding to signaling from the base station to trigger the on-demand SSB, etc.
[0023] Throughout this description, it may be described that a UE may activate an OD-SSB SCell. As described above, this activation may include send a request to the network for the network to turn on the OD-SSB transmission for the SCell. The activation may also include the UE performing synchronization and measurements based on the OD-SSBs transmitted by the SCell.
[0024] Some example embodiments provide operations for a UE to determine when an OD-SSB SCell is to begin transmitting OD-SSBs. Other example embodiments are related to reporting that the UE should perform during OD-SSB SCell activation. Still further example embodiments are related to RF adjustments and interruption windows for performing the RF adjustments during OD-SSB SCell activation. Additional example embodiments are related to the starting and length of an SCell timer (e.g., SCell deactivation timer) for an SCell to be activated. More example embodiments are related to various signaling provided by the network to the UE to indicate information related to the OD-SSB SCell activation / deactivation. Each of these example embodiments will be described in greater detail below.
[0025] 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.
[0026] 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.
[0027] 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. ) .
[0028] 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 SIM 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) . In the example of Fig. 1, the gNB 120A may represent any of a PCell, an activated SCell, an SCell to be activated or a deactivated SCell as will be described in greater detail below.
[0029] 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.
[0030] 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.
[0031] 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 activating / deactivating OD-SSB SCells. The operations include, but are not limited to, determining when an OD-SSB SCell is to begin transmitting OD-SSBs, reporting information to the network during OD-SSB SCell activation, performing RF adjustments during OD-SSB SCell activation and starting an SCell deactivation timer for an SCell to be activated. Each of these example operations will be described in more detail below.
[0032] 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.
[0033] 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.
[0034] 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.
[0035] 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. As described above, the base station 300 may represent any of a PCell, an activated SCell, an SCell to be activated or a deactivated SCell, e.g., the base station 300 may perform any of the operations described for these different cells throughout this description.
[0036] 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.
[0037] 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, sending the UE an OD-SSB SCell activation command, indicating when the OD-SSB SCell to be activated begins transmitting OD-SSBs, and sending the UE an OD-SSB deactivation command. Each of these example operations will be described in more detail below.
[0038] 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.
[0039] 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.
[0040] As described above, the example embodiments relate to activating and / or deactivating an OD-SSB SCell. The example embodiments provide various manners for the network (e.g., core network, PCells, SCells, etc. ) and the UE to operate to perform OD-SSB SCell activation and deactivation. The example embodiments are primarily described from the standpoint of operations performed by the network and the UE during OD-SSB SCell activation. However, those skilled in the art will understand that there are corresponding operations performed by the network and the UE for OD-SSB SCell deactivation.
[0041] Fig. 4 shows an example timeline 400 related to Secondary Cell (SCell) activation and an on-demand SSB (OD-SSB) indication according to various example embodiments. The timeline 400 is only an example and will be used to describe various issues and solutions to these issues provided by the example embodiments.
[0042] At a first time, a UE may receive an SCell activation command 405 from the network. This SCell activation command 405 may be, for example, a Medium Access Control Control Element (MAC-CE) but is not limited to this type of signaling. The UE then processes the SCell activation command 405 during time interval 410. In this example, the time interval 410 is defined as 3ms + T_HARQ, where the 3ms is the time to process the MAC-CE and the T_HARQ is the time used by the UE to transmit a HARQ-ACK acknowledgement receipt of the SCell activation command 405.
[0043] During the time interval 415, the SCell will not be transmitting SSBs. As described above, since the SCell is an OD-SSB SCell, the SCell will not transmit SSBs until there has been an OD-SSB indication. In the example of Fig. 4, the OD-SSB indication 420 is illustrated at a second time. After the UE receives the OD-SSB indication, the UE may determine that the SCell is transmitting OD-SSBs as shown in Fig. 4 as OD-SSBs 422-428. However, there may be different signals that may be considered to be the OD-SSB indication by the UE. The example embodiments include various signals that may be used as the OD-SSB indication.
[0044] In a first example related to the OD-SSB indication, the SCell activation command (e.g., the SCell activation command 405) may be used as a default scheme to indicate the OD-SSB transmission. For example, if the UE supports OD-SSB operation and has been configured with an SCell with OD-SSB, and the OD-SSB of this SCell has not been indicated to the UE before the SCell activation command 405, when the UE receives the SCell activation command 405 of this SCell with OD-SSB, the UE may treat this SCell activation command 405 as an OD-SSB indication in addition to it being the activation command, e.g., the UE may determine the OD-SSB on this being-activated SCell will be available after this SCell activation command. Thus, in this example, the UE may not receive a separate or dedicated OD-SSB indication 420 as the SCell activation command 405 operates as the OD-SSB indication and the UE may determine that the SCell is transmitting OD-SSBs 422-428 based on the receipt of the SCell activation command 405.
[0045] In this example, there may be various manners to determine OD-SSB deactivation. In a first option, if the UE supports OD-SSB operation and has an active SCell with available OD-SSB, when the UE receives an SCell deactivation command for this SCell with available OD-SSB, the UE may treat the SCell deactivation command as an OD-SSB muting / disable indication in addition to being a the deactivation command, e.g., the UE determines the OD-SSB on this being-deactivated SCell will be unavailable after this SCell deactivation command.
[0046] In a second option, the UE may use a dedicated OD-SSB muting / disable indication to determine that the OD-SSB on this being-deactivated SCell is unavailable, e.g., the UE does not determine that the OD-SSB will be unavailable based on the SCell deactivation command.
[0047] Returning to the OD-SSB indication, in a second example, the SCell activation command 405 may be used as a scheme to indicate the OD-SSB transmission only if the UE has not received a dedicated OD-SSB indication from network within a time T. For example, if the UE supports OD-SSB operation and has been configured with an SCell with OD-SSB, and the OD-SSB of this SCell has not been indicated to UE before the SCell activation command, when the UE receives the SCell activation command 405 for this SCell with OD-SSB, the UE may wait during a time window T to determine if it has received a dedicated OD-SSB indication 420 from the network. If no OD-SSB indication is received within the time T, the UE may determine the OD-SSB on this being-activated SCell will be available after this SCell activation command + T. The value of T may be configured by the network (MAC-CE signaling, Radio Resource Control (RRC) signaling, etc. ) or predefined in standards, e.g., 3GPP standards.
[0048] In this example, with respect to OD-SSB deactivation, if the UE supports OD-SSB operation and has an active SCell with available OD-SSB, when the UE receives an SCell deactivation command of the SCell with available OD-SSB, the UE may wait during a time window S to see if the UE can receive a dedicated OD-SSB muting / disable indication from the network. If no dedicated OD-SSB muting / disable indication is received within S, the UE may determine the OD-SSB on this being-deactivated SCell will be unavailable after this SCell deactivation command + S. The value of S may be configured by the network (MAC-CE signaling, RRC signaling, etc. ) or predefined in standards, e.g., 3GPP standards.
[0049] Returning to Fig. 4, the UE may perform Out of Range Channel Quality Indication (OOR CQI) reporting to the network shown in Fig. 4 as OOR CQI reporting 432-436. For example, when the UE receives the OD-SSB indication 420 (e.g., in the examples above this may be a dedicated OD-SSB indication or an SCell activation command) , the UE / network may perform various operations related to SCell activation including SCell synchronization, time / frequency (T / F) tracking, beam measurement, transmission configuration indication (TCI) and CQI reference signal (RS) activation, etc. However, these operations are not instantaneous as the UE may have to receive one or more of the OD-SSBs (e.g., OD-SSBs 422-428) and process the OD-SSBs to perform the operations. This OOR CQI reporting is performed during the SCell activation if the UE has available uplink resources to report CQI for the SCell. When the SCell activation has been completed, the UE may perform valid CQI reporting 440, e.g., the UE continues to report OOR CQI until a valid CQI is available.
[0050] Similar to the OOR CQI reporting during SCell activation, the UE may also report a Layer 1 Reference Signal Received Power (L1-RSRP) that is a lowest valid L1 SS-RSRP range until the UE has completed a first L1-RSRP measurement. This is not shown in Fig. 4 but is similar to the OOR CQI reporting in that the UE continues to report the lowest valid L1 SS-RSRP range until a valid L1-RSRP measurement is available.
[0051] However, referring to Fig. 4, during the time interval 415 both the UE and the network will understand that there are no OD-SSBs being transmitted by the SCell and therefore the OOR CQI reporting 432 and the L1-RSRP is meaningless, e.g., the UE is wasting power and other resources to transmit an OOR CQI report or L1-RSRP report when there is no possible OD-SSB to measure. Thus, another issue that arises concerning OD-SSBs is when should the UE begin performing OOR CQI and L1-RSRP reporting.
[0052] In some example embodiments, when the UE supports OD-SSB operation and has been configured with an SCell with OD-SSB, the UE may begin OOR CQI reporting after receiving the SCell activation command 405 + T_HARQ + MAC CE decoding time (410) and after receiving the OD-SSB indication 420 from the network. This OOR CQI reporting may then be maintained until the UE completes the SCell activation. Thus, in this example, the first instance of the OOR CQI reporting 432 shown in Fig. 4 may be skipped because it occurs before the OD-SSB indication 420, thereby saving UE power and UL resources.
[0053] This example may be written into the standards, e.g., 3GPP standards) as: After the slot specified in clause 4.3 of TS 38.213 (timing for secondary Cell activation / deactivation) , starting from the slot where OD-SSB indication is received and until the UE has completed the SCell activation, the UE shall report out of range if the UE has available uplink resources to report CQI for the SCell.
[0054] Similarly, for L1-RSRP reporting, the UE may begin to report L1-RSRP as the lowest valid L1 SS-RSRP range after receiving the SCell activation command 405 + T_HARQ + MAC CE decoding time (410) and after receiving the OD-SSB indication 420 from the network. This L1-RSRP reporting with the lowest valid L1 SS-RSRP range will occur until the UE has completed a first L1-RSRP measurement, at which time, the valid L1-RSRP measurements for the SCell may be reported to the network. Thus, in this example, the UE may not perform L1-RSRP reporting during the time interval 415 because it is before the OD-SSB indication 420, thereby saving power and UL resources.
[0055] This example may be written into the standards, e.g., 3GPP standards) as: After the slot specified in clause 4.3 of TS 38.213 (timing for secondary Cell activation / deactivation) , starting from {the slot where OD-SSB indication is received} and until the UE has completed a first L1-RSRP measurement, the UE shall report lowest valid L1 SS-RSRP range if the UE has available uplink resources to report L1-RSRP for the SCell.
[0056] In other example embodiments, the network may indicate or configure the UE to start the OOR CQI reporting or L1-RSRP reporting with the lowest index reporting from SCell activation command 405 + T_HARQ + MAC CE decoding time (410) , or to start the OOR CQI reporting or the L1-RSRP reporting with the lowest index reporting from the OD-SSB indication 420 after receiving the SCell activation command 405 + T_HARQ + MAC CE decoding time (410) . The network indication or configuration may be via RRC signaling, MAC-CE signaling, or Downlink Control Indication (DCI) signaling. The UE may be signaled when to start the OOR CQI reporting or L1-RSRP reporting for the to be activated SCell by, for example, the PCell or another already activated SCell.
[0057] Another issue that may arise during SCell activation using OD-SSBs is radio frequency (RF) adjustment and interruption. For example, the UE may be currently connected to a PCell and may be activating an OD-SSB SCell. As part of this activation, the UE may turn on a second transmission (Tx) and / or reception (Rx) chain to communicate with the SCell. This turning on of the second Tx / Rx chain may cause RF interference that the UE may have to account for in communications by performing RF adjustments. These RF adjustments are performed during an interruption window.
[0058] In some example embodiments, when the UE supports OD-SSB operation and has been configured with a SCell with OD-SSB, after receiving the SCell activation command 405 + T_HARQ + MAC CE decoding time (410) , the UE may start the RF adjustment after receiving the OD-SSB indication 420 from the network and complete the RF adjustment no later than the first available OD-SSB arrival after OD-SSB indication, e.g., OD-SSB 422.
[0059] This RF adjustment may occur during an interruption window that may be specified as follows: The starting point of an interruption window on a special cell (SPCell) or any activated SCell, as specified in clause 8.2 in TS 38.133, shall not occur before slot n+1+T_HARQ / NR_slot_length+T_OD-SSB_indication and not occur after slot n +1+ (T_HARQ +3ms+Tx) / NR_slot_length. In this formulation, the NR slot length may be with respect to the numerology used in the SCell being activated, Tx is the time to the end of the first complete OD-SSB burst indicated by the OD-SSB indication or preconfigured SS / PBCH Block Measurement Timing Configuration (SMTC) and T_OD-SSB_indication is the time uncertainty from n+T_HARQ / NR_slot_length to the time slot when the UE receives the OD-SSB indication.
[0060] In other example embodiments, when the UE supports OD-SSB operation and has been configured with a SCell with OD-SSB, after receiving the SCell activation command + T_HARQ + MAC CE decoding time, the UE may start RF adjustment after receiving the OD-SSB indication + T_HARQ from network and complete the RF adjustment no later than the first available OD-SSB arrival after OD-SSB indication.
[0061] This RF adjustment may occur during an interruption window that may be specified as follows: The starting point of an interruption window on an SPCell or any activated SCell, as specified in clause 8.2 in TS38.133, shall not occur before slot n+1+T_HARQ / NR_slot_length+T_OD-SSB_indication+T_HARQ / NR_slot_length and not occur after slot n +1+ (T_HARQ+3ms+Tx) / NR_slot_length. In this formulation, NR slot length may be with respect to the numerology used in the SCell being activated, Tx is the time to the end of the first complete OD-SSB burst indicated by the OD-SSB indication or preconfigured SMTC and T_OD-SSB_indication is the time uncertainty from n+T_HARQ / NR_slot_length to the time slot when UE receives OD-SSB indication.
[0062] In still further example embodiments, when the UE supports OD-SSB operation and has been configured with a SCell with OD-SSB, the network may indicate or configure the UE to start the RF adjustment from a different time, e.g., use a legacy interruption range or use the range in the above examples. The network indication or configuration may be via RRC signaling, or MAC-CE signaling, or DCI signaling.
[0063] Another issue related to OD-SSB SCell activation is the SCell deactivation timer (e.g., sCellDeactivationTimer) that is configured for the UE. According to legacy SCell activation procedures, when the sCellDeactivationTimer is configured, the UE will assume the SCell is deactivated if this timer is expired even during the SCell activation procedure. However, because the OD-SSB SCell activation is different from legacy SCell activation, the SCell deactivation timer may conflict with the OD-SSB SCell activation.
[0064] The example embodiments provide various options for handling the SCell deactivation timer when the UE supports OD-SSB operation and has been configured with an SCell with OD-SSB. In a first option, after receiving the SCell activation command 405, the UE will start the sCellDeactivationTimer after receiving the OD-SSB indication 420.
[0065] In a second option, the sCellDeactivationTimer may be configured to be longer than the {time uncertainty between SCell activation and OD-SSB indication} + {legacy SCell activation delay based on SSB} + {time uncertainty of valid CQI reporting} . The second option is not mutually exclusive of the first option, e.g., the first option and the second option may be used together but are not required to both be used. For example, the second option may be used to set the length (or duration) of the sCellDeactivationTimer and the first option may be used to determine when to start the timer.
[0066] In a third option, the OD-SSB indication 420 may be sent to the UE before the sCellDeactivationTimer expires. In this option, the OD-SSB indication 420 may be sent to UE on T slots earlier than the sCellDeactivationTimer expiration, e.g. to allow the UE time to complete the SCell activation. The T slots may be the time delay for the UE to complete the SCell activation procedure, including SCell synchronization, Automatic Gain Control (AGC) settling, T / F tracking, beam measurement, TCI and CQI-RS activation. The T slots may also be the “time delay for the UE to complete the SCell activation procedure” + “the time interval between {OD-SSB indication and first OD-SSB transmission} . ”
[0067] As described above, the OD-SSB indication 420 for OD-SSB SCell activation may be signaled to the UE using MAC-CE signaling. However, there is currently no defined MAC-CE to perform this signaling. The following provides various examples of MAC-CE signaling that may be used to activate and / or deactivate an OD-SSB SCell.
[0068] Fig. 5 shows an example fixed size MAC-CE 500 for indicating the activation / deactivation of OD-SSBs for an SCell according to various example embodiments. In this example, the MAC-CE 500 may have a fixed size and may be used only to activate and / or deactivate OD-SSBs.
[0069] The format for the MAC-CE 500 may include a new logical channel Identification (LCID) or extended LCID (eLCID) that identifies the logical channel instance of the corresponding MAC SDU or the type of the MAC CE 500. This new LCID and / or eLCID may be defined, for example, in 3GPP TS 38.321.
[0070] As shown in Fig. 5, the fixed size of the MAC-CE 500 may be 1 octet (8 bits) . However, this size is not a requirement as other fixed sizes may be used. The seven bits labeled as Bi, e.g., B1-B7, may correspond to configured SCells. For example, if there is an SCell configured for the MAC entity with SCellIndex i as specified in TS 38.331, this field indicates the activation / deactivation status of the OD SSB transmission in the SCell with SCellIndex i. Thus, if there is an SCell with an index 1, the UE may use the information in the field B1 to determine if the SCell with the index 1 is transmitting OD-SSBs based on the receipt of the MAC-CE 500. If there is no SCell with an index corresponding to the Bi, field, the UE may ignore the information in the field of the MAC-CE 500. In one example, if the Bi field is set to 1, this indicates to the UE that the OD-SSB SCell with SCellIndex i is to be activated. If the Bi field is set to 0, this indicates to the UE that the OD-SSB SCell with SCellIndex i is to be deactivated. The MAC-CE 500 may also include a reserved bit set to 0.
[0071] As stated above, the UE may receive the new MAC-CE 500 for OD-SSB SCell activation / deactivation. However, the UE may also receive the legacy SCell activation / deactivation MAC-CE. When the UE receives both MAC-CEs, the example embodiments provide the UE with options for operations when this occurs.
[0072] In a first option, if the by-default assumption is not configured, the UE keeps independent processing for the new MAC-CE 500 for OD-SSB and the legacy MAC-CE for SCell activation / deactivation. As described above, the by-default assumption is that the SCell activation command (e.g., the SCell activation command 405) may be used as a default scheme to indicate the OD-SSB transmission, e.g., the legacy SCell activation command indicates the OD-SSB transmission for the to be activated SCell. However, the first option relates to the scenario where the by-default scenario is not used, e.g., the dedicated MAC-CE 500 is the OD-SSB indication 420 indicating the activation / deactivation of the OD-SSBs for the SCell. Thus, in this option, the UE may independently process the legacy MAC-CE and the new MAC-CE 500.
[0073] In a second option, for a SCell with OD-SSB, the UE may be configured with the by-default assumption for OD-SSB transmission with SCell activation and / or deactivation using RRC signaling. In this option, the above description for the by-default assumption, e.g., the legacy SCell activation command indicates the OD-SSB transmission for the to be activated SCell may be used. The by-default assumption may be configured separately for SCell activation (e.g., the UE can determine that reception of the SCell activation MAC-CE with SCellIndex i also indicates activation status of the OD-SSB transmission in this SCell) and the SCell deactivation (e.g., the UE can determine that reception of the SCell deactivation MAC-CE with SCellIndex i also indicates deactivation status of OD-SSB transmission in this SCell) .
[0074] Fig. 6 shows an example variable size MAC-CE 600 for indicating the activation / deactivation of OD-SSBs for an SCell according to various example embodiments. In this example, the MAC-CE 600 may have a variable size and may be used to activate and / or deactivate OD-SSBs and to activate / deactivate SCells.
[0075] The format for the MAC-CE 600 may include a new LCID eLCID that identifies the logical channel instance of the corresponding MAC SDU or the type of the MAC CE 600. This new LCID and / or eLCID may be defined, for example, in 3GPP TS 38.321.
[0076] As shown in Fig. 6, the MAC-CE 600 may include a first octet (8 bits) labeled as Bi, e.g., B1-B7, that may correspond to configured SCells. The Bi field of the MAC-CE 600 may be similar to the Bi field of the MAC-CE 500 described above, e.g., if there is an SCell configured for the MAC entity with SCellIndex i as specified in TS 38.331, this field indicates the activation / deactivation status of the OD-SSB transmission in the SCell with SCellIndex i, else the UE ignores the Bi field of the MAC-CE 600.
[0077] The MAC-CE 600 may also include a second octet (8 bits) labeled as Ci, e.g., C1-C7 that may correspond to configured SCells. For the Ci field, if there is an SCell configured for the MAC entity with SCellIndex i as specified in TS 38.331, this field indicates the activation / deactivation status of the SCell with SCellIndex i, else the UE may ignore the Ci field. In one example, when the Ci field is set to 1, this indicates to the UE that the SCell with SCellIndex i is to be activated. When the Ci field is set to 0, this indicates to the UE that the SCell with SCellIndex i is to be deactivated. The MAC-CE 600 has a variable size because the second octet may only be present when an SCell is activated / deactivated and may not be included in this MAC-CE 600 when the SCell activation / deactivation is not signaled. Each of the octets of the MAC-CE 600 may also include a reserved bit set to 0.
[0078] In this example, if the MAC-CE 600 includes the second octet (e.g., the SCell activation / deactivation) , the MAC-CE 600 will also simultaneously include the corresponding indication of the OD-SSB activation / deactivation, e.g., the Bi field and Ci field for the same SCellIndex i will have the same value for activation or deactivation.
[0079] Similar to the previous example of the MAC-CE 500, when the MAC-CE 600 is used, the UE may still receive the legacy MAC-CE for SCell activation / deactivation. In a first option, if the UE supports OD-SSB operation and has been configured with an SCell with OD-SSB, the UE may not expect to receive the legacy SCell activation / deactivation MAC-CE, e.g., the MAC-CE 600 is the only indication the UE may receive with respect to SCell activation / deactivation.
[0080] In a second option, if the UE supports OD-SSB operation and has been configured with an SCell with OD-SSB, and the UE receives a legacy SCell activation / deactivation MAC-CE, the UE may only activate / deactivate the SCell but keeps the status of the OD-SSB transmission for the SCell (e.g., if OD-SSB is not activated before reception of SCell activation MAC-CE, the UE regards it is still not activated after reception of the MAC-CE) .
[0081] In a third option, if the UE supports OD-SSB operation and has been configured with an SCell with OD-SSB, and the UE receives a legacy SCell activation / deactivation MAC-CE, the UE may only activate / deactivate the SCell and deactivate its OD-SSB transmission.
[0082] In a fourth option, if the UE supports OD-SSB operation and has been configured with an SCell with OD-SSB, and the UE receives a legacy SCell activation MAC-CE, the UE may only activate the SCell and deactivate its OD-SSB transmission.
[0083] The above examples of the MAC-CE 500 and MAC-CE 600 may be short format MAC-CEs, e.g., each of the MAC-CE 500 and MAC-CE 600 accommodate indications for up to seven (7) SCells. However, long format MAC-CEs may also be used.
[0084] Fig. 7 shows an example long format fixed size MAC-CE 700 for indicating the activation / deactivation of OD-SSBs for an SCell according to various example embodiments. In this example, the MAC-CE 700 may have a fixed size and may be used only to activate and / or deactivate OD-SSBs similar to the MAC-CE 500. However, as shown in Fig. 7, the long format MAC-CE 700 may accommodate indications for up to 31 SCells.
[0085] Fig. 8 shows an example long format variable size MAC-CE 800 for indicating the activation / deactivation of OD-SSBs for an SCell according to various example embodiments. In this example, the MAC-CE 800 may have a variable size and may be used to activate and / or deactivate OD-SSBs and to activate / deactivate SCells similar to the MAC-CE 600. However, as shown in Fig. 8, the long format MAC-CE 800 may accommodate indications for up to 31 SCells.
[0086] In the example embodiments, when a legacy SCell (de) activation MAC-CE is also used, the network may use the same format for the OD-SSB MAC-CE (e.g., either both have the short format, or both have the long format) .
[0087] Fig. 9 shows an example method 900 for a UE activating an OD-SSB SCell according to various example embodiments. The various operations described for the method 900 may be performed in a different order than presented in Fig. 9 and some of the operations may be performed simultaneously during the SCell activation procedure. Thus, the order of the operations presented in Fig. 9 is only an example. Furthermore, the operations described in Fig. 9 are not an exhaustive list of operations performed by a UE during SCell activation. Other operations may include, but are not limited to, SCell synchronization, T / F tracking, beam measurement, TCI and CQI RS activation, etc. In addition, the operations shown in Fig. 9 are for activating an OD-SSB SCell.
[0088] In 910, the UE receives an SCell activation command from the network to activate an OD-SSB SCell. In the example of Fig. 4, the SCell activation command was shown as SCell activation command 405.
[0089] In 920, the UE receives an OD-SSB indication to indicate that the OD-SSB SCell to be activated will begin transmitting OD-SSBs. As described above, in some examples, the SCell activation command may also act as the OD-SSB indication. In other examples, the OD-SSB indication may be a separate dedicated signaling received from the network. Some example MAC-CEs for providing the OD-SSB indication and / or the SCell activation command were described above.
[0090] In 930, the UE may perform OOR CQI reporting and / or L1-RSRP reporting for the SCell to be activated. As described above, the OOR CQI reporting occurs prior to the UE obtaining valid CQI measurements on the OD-SSBs transmitted by the SCell to be activated. Similarly, the UE reports a lowest index for the L1-RSRP prior to the UE obtaining valid L1-RSRP measurements on the OD-SSBs transmitted by the SCell to be activated. As also described above, because the SSBs are on-demand SSBs, there may be time intervals when the OOR CQI reporting and / or L1-RSRP reporting may not be performed by the UE. The example embodiments described above provided various timelines or triggers for the OOR CQI reporting and / or L1-RSRP reporting to be started to save UE power or UL resources.
[0091] In 940, the UE may perform RF adjustment to account for RF interference when turning on a new Tx / Rx chain for the SCell to be activated. The RF adjustment may be performed during an interruption window and the example embodiments provided examples of when the interruption window may start and the length of the interruption window.
[0092] In 950, the UE may start an SCell deactivation timer for the SCell to be activated. The example embodiments provided various manners of when to start the deactivation timer and lengths or durations of the deactivation timer.
[0093] While the example method 900 described operations related to activating an OD-SSB SCell, those skilled in the art will understand that there are corresponding operations to deactivate an OD-SSB SCell.
[0094] Examples
[0095] In a first example, a method, comprising processing, based on signaling received from a network, an activation command to activate an on-demand synchronization signal block (OD-SSB) secondary cell (SCell) , determining the OD-SSB SCell is transmitting OD-SSBs and activating the OD-SSB SCell based on one or more OD-SSBs.
[0096] In a second example, the method of the first example, wherein the determining the OD-SSB SCell is transmitting OD-SSBs is based on the activation command for the OD-SSB SCell.
[0097] In a third example, the method of the second example, further comprising processing, based on signaling from the network, a deactivation command to deactivate the OD-SSB SCell.
[0098] In a fourth example, the method of the third example, further comprising determining that the OD-SSB SCell is not transmitting OD-SSBs based on the deactivation command for the OD-SSB SCell.
[0099] In a fifth example, the method of the third example, further comprising processing, based on signaling received from the network, an OD-SSB deactivation indication indicating the OD-SSB SCell corresponding to the deactivation command is not transmitting OD-SSBs.
[0100] In a sixth example, the method of the first example, further comprising processing, based on signaling received from the network, an OD-SSB indication, wherein the processing circuitry determines the OD-SSB SCell is transmitting OD-SSBs based on the OD-SSB indication, wherein the OD-SSB SCell begins transmitting OD-SSBs a predetermined time after the OD-SSB indication.
[0101] In a seventh example, the method of the sixth example, wherein the OD-SSB indication is received at a time after the activation command and wherein the method further comprises determining that a channel quality indicator (CQI) measurement for the OD-SSBs transmitted by the OD-SSB SCell is not valid, wherein the CQI measurement is performed after receiving the OD-SSB indication and generating, for transmission to the network, an out of range CQI (OOR CQI) report at a first predetermined time after receiving the OD-SSB indication.
[0102] In an eighth example, the method of the seventh example, further comprising generating, at predetermined time intervals, further OOR CQI reports until a valid CQI measurement for the OD-SSBs transmitted by the OD-SSB SCell is obtained.
[0103] In a ninth example, the method of the sixth example, wherein the OD-SSB indication is received at a time after the activation command and wherein the method further comprises determining that a Layer 1 Reference Signal Received Power (L1-RSRP) measurement for the OD-SSBs transmitted by the OD-SSB SCell is not valid, wherein the L1-RSRP measurement is performed after receiving the OD-SSB indication and generating, for transmission to the network, an L1-RSRP report comprising a lowest valid L1 SS-RSRP range for the OD-SSB SCell at a first predetermined time after receiving the OD-SSB indication.
[0104] In a tenth example, the method of the ninth example, further comprising generating, at predetermined time intervals, further L1-RSRP reports comprising the lowest valid L1 SS-RSRP range for the OD-SSB SCell until a valid L1-RSRP measurement for the OD-SSBs transmitted by the OD-SSB SCell is obtained.
[0105] In an eleventh example, the method of the sixth example, wherein the OD-SSB indication is received at a time after the activation command and wherein the method further comprises processing, based on signaling received from the network, a channel quality indicator (CQI) starting indication indicating a time when an out of range CQI (OOR CQI) report is to be transmitted to the network based on an invalid CQI measurement for the OD-SSBs transmitted by the OD-SSB SCell, wherein the CQI measurement is performed after receiving the OD-SSB indication.
[0106] In a twelfth example, the method of the sixth example, wherein the OD-SSB indication is received at a time after the activation command and wherein the method further comprises processing, based on signaling received from the network, a Layer 1 Reference Signal Received Power (L1-RSRP) starting indication indicating a time when an L1-RSRP report comprising a lowest valid L1 SS-RSRP range for the OD-SSB SCell is to be transmitted to the network based on an invalid L1-RSRP measurement for the OD-SSBs transmitted by the OD-SSB SCell, wherein the L1-RSRP measurement is performed after receiving the OD-SSB indication.
[0107] In a thirteenth example, the method of the sixth example, wherein the OD-SSB indication is received at a time after the activation command and wherein the method further comprises performing a radio frequency (RF) adjustment based on receiving the OD-SSB indication, wherein the RF adjustment does not start until a slot n+1+T_HARQ / NR_slot_length+T_OD-SSB_indication and does not finish until after a slot n +1+ (T_HARQ +3ms+Tx) / NR_slot_length, where NR slot length is with respect to a numerology used in the OD-SSB SCell being activated, Tx is a time to an end of a first complete OD-SSB burst indicated by the OD-SSB indication or preconfigured SS / PBCH Block Measurement Timing Configuration (SMTC) and T_OD-SSB_indication is a time uncertainty from n+T_HARQ / NR_slot_length to a time slot when the OD-SSB indication is received.
[0108] In a fourteenth example, the method of the sixth example, wherein the OD-SSB indication is received at a time after the activation command and wherein the method further comprises performing a radio frequency (RF) adjustment based on receiving the OD-SSB indication, wherein the RF adjustment does not start before slot n+1+T_HARQ / NR_slot_length+T_OD-SSB_indication +T_HARQ / NR_slot_length and not finish after slot n +1+ (T_HARQ +3ms+Tx) / NR_slot_length, where NR slot length is with respect to a numerology used in the OD-SSB SCell being activated, Tx is a time to an end of a first complete OD-SSB burst indicated by the OD-SSB indication or preconfigured SS / PBCH Block Measurement Timing Configuration (SMTC) and T_OD-SSB_indication is a time uncertainty from n+T_HARQ / NR_slot_length to a time slot when the OD-SSB indication is received.
[0109] In a fifteenth example, the method of the sixth example, further comprising starting an SCell deactivation timer after receiving the OD-SSB indication.
[0110] In a sixteenth example, the method of the fifteenth example, wherein a duration of the SCell deactivation timer is longer than a time uncertainty between {the OD-SSB SCell activation and the OD-SSB indication} + {alegacy SCell activation delay based on SSB} + {atime uncertainty of valid channel quality indicator (CQI) reporting} .
[0111] In a seventeenth example, the method of the first example, further comprising determining that a dedicated OD-SSB indication was not received within a predetermined period of time from the activation command of the OD-SSB SCell and determining that the OD-SSB SCell is transmitting OD-SSBs at a time starting after the predetermined period of time based on the dedicated OD-SSB indication not being received within the predetermined period of time.
[0112] In an eighteenth example, the method of the seventeenth example, wherein the predetermined period of time is one of configured by the network or hard coded in standards.
[0113] In a nineteenth example, the method of the seventeenth example, further comprising processing, based on signaling from the network, a deactivation command to deactivate the OD-SSB SCell, determining that a dedicated OD-SSB deactivation indication was not received within a second predetermined period of time from the deactivation command and determining that the OD-SSB SCell is not transmitting OD-SSBs at a time starting after the second predetermined period of time based on the dedicated OD-SSB deactivation indication not being received within the second predetermined period of time.
[0114] In a twentieth example, the method of the nineteenth example, wherein the second predetermined period of time is one of configured by the network or hard coded in standards.
[0115] In a twenty first example, the method of the first example, further comprising processing, based on signaling received from the network, a channel quality indicator (CQI) starting indication indicating a time when an out of range CQI (OOR CQI) report is to be transmitted to the network based on an invalid CQI measurement for OD-SSBs transmitted by the OD-SSB SCell, wherein the time is based on a time when the activation command was received, a time for processing the activation command and a time for acknowledging the activation command.
[0116] In a twenty second example, the method of the first example, further comprising processing, based on signaling received from the network, a Layer 1 Reference Signal Received Power (L1-RSRP) starting indication indicating a time when an L1-RSRP report comprising a lowest valid L1 SS-RSRP range for the OD-SSB SCell is to be transmitted to the network based on an invalid L1-RSRP measurement for the OD-SSBs transmitted by the OD-SSB SCell, wherein the time is based on a time when the activation command was received, a time for processing the activation command and a time for acknowledging the activation command.
[0117] In a twenty third example, the method of the first example, further comprising processing, based on signaling from the network, an indication of a time to perform a radio frequency (RF) adjustment operation and performing the RF adjustment operation starting at the time from the indication.
[0118] In a twenty fourth example, the method of the first example, further comprising starting an SCell deactivation timer, wherein a duration of the SCell deactivation timer is longer than a time uncertainty between {the OD-SSB SCell activation and an OD-SSB indication} + {alegacy SCell activation delay based on SSB} + {atime uncertainty of valid channel quality indicator (CQI) reporting} .
[0119] In a twenty fifth example, a processor configured to perform any of the methods of the first through twenty fourth examples.
[0120] In a twenty sixth example, a user equipment (UE) comprising a transceiver configured to communicate with a network and a processor communicatively coupled to the transceiver and configured to perform any of the methods of the first through twenty fourth examples.
[0121] In a twenty seventh example, a method comprising processing, based on signaling received from a network, an activation command to activate an on-demand synchronization signal block (OD-SSB) secondary cell (SCell) , processing, based on signaling received from the network, an OD-SSB indication indicating the OD-SSB SCell is transmitting OD-SSBs and activating the OD-SSB SCell based on one or more OD-SSBs.
[0122] In a twenty eighth example, the method of the twenty seventh example, wherein the OD-SSB indication comprises a medium access control control element (MAC-CE) having one of a fixed size or a variable size.
[0123] In a twenty ninth example, the method of the twenty eighth example, wherein the MAC-CE comprises one or more fields, wherein one of the fields corresponds to an SCell index of the OD-SSB SCell, wherein a value of the one of the fields indicates whether the OD-SSB SCell is transmitting OD-SSBs.
[0124] In a thirtieth example, the method of the twenty eighth example, wherein the MAC-CE comprises a short format comprising seven fields corresponding to seven OD-SSB SCells.
[0125] In a thirty first example, the method of the twenty eighth example, wherein the MAC-CE comprises a long format comprising thirty one fields corresponding to thirty one OD-SSB SCells.
[0126] In a thirty second example, the method of the twenty eighth example, wherein, when the MAC-CE has a fixed size, the MAC-CE only indicates whether OD-SSB SCells are transmitting OD-SSBs.
[0127] In a thirty third example, the method of the twenty eighth example, wherein, when the MAC-CE has a variable size, the MAC-CE indicates whether OD-SSB SCells are transmitting OD-SSBs and further indicates whether OD-SSB SCells are to be activated or deactivated.
[0128] In a thirty fourth example, the method of the twenty eighth example, wherein the activation command comprises a MAC-CE.
[0129] In a thirty fifth example, the method of the thirty fourth example, wherein the MAC-CE comprising the activation command and the MAC-CE comprising the OD-SSB indication are processed separately.
[0130] In a thirty sixth example, the method of the thirty fourth example, further comprising processing, based on signaling received from the network, a default configuration indicating that the MAC-CE comprising the activation command also indicates that the OD-SSB SCell is transmitting OD-SSBs.
[0131] In a thirty seventh example, the method of the twenty eighth example, wherein the activation command is received in the MAC-CE and wherein the processing circuitry does not expect to receive a separate MAC-CE with the activation command.
[0132] In a thirty eighth example, the method of the twenty eighth example, further comprising processing a deactivation command for the OD-SSB received in a MAC-CE from the network, deactivating the OD-SSB SCell and maintaining a status of the OD-SSBs being transmitted by the OD-SSB SCell based on the MAC-CE comprising the OD-SSB indication.
[0133] In a thirty ninth example, a processor configured to perform any of the methods of the twenty seventh through thirty eighth examples.
[0134] In a fortieth example, a user equipment (UE) comprising a transceiver configured to communicate with a network and a processor communicatively coupled to the transceiver and configured to perform any of the methods of the twenty seventh through thirty eighth examples.
[0135] In a forty first example, a method comprising generating, for transmission to a user equipment (UE) , an activation command to activate an on-demand synchronization signal block (OD-SSB) secondary cell (SCell) and generating, for transmission to the UE, an OD-SSB indication indicating the OD-SSB SCell is transmitting OD-SSBs.
[0136] In a forty second example, the method of the forty first example, wherein the OD-SSB indication comprises a medium access control control element (MAC-CE) having one of a fixed size or a variable size.
[0137] In a forty third example, the method of the forty second example, wherein the MAC-CE comprises one or more fields, wherein one of the fields corresponds to an SCell index of the OD-SSB SCell, wherein a value of the one of the fields indicates whether the OD-SSB SCell is transmitting OD-SSBs.
[0138] In a forty fourth example, the method of the forty second example, wherein the MAC-CE comprises a short format comprising seven fields corresponding to seven OD-SSB SCells.
[0139] In a forty fifth example, the method of the forty second example, wherein the MAC-CE comprises a long format comprising thirty one fields corresponding to thirty one OD-SSB SCells.
[0140] In a forty sixth example, the method of the forty second example, wherein, when the MAC-CE has a fixed size, the MAC-CE only indicates whether OD-SSB SCells are transmitting OD-SSBs.
[0141] In a forty seventh example, the method of the forty second example, wherein, when the MAC-CE has a variable size, the MAC-CE indicates whether OD-SSB SCells are transmitting OD-SSBs and further indicates whether OD-SSB SCells are to be activated or deactivated.
[0142] In a forty eighth example, the method of the forty first example, wherein the OD-SSB indication is received at a time after the activation command and wherein the method further comprises generating, for transmission to the UE, a channel quality indicator (CQI) starting indication indicating a time when an out of range CQI (OOR CQI) report is to be transmitted to a network based on an invalid CQI measurement for the OD-SSBs transmitted by the OD-SSB SCell, wherein the CQI measurement is performed after receiving the OD-SSB indication.
[0143] In a forty ninth example, the method of the forty first example, wherein the OD-SSB indication is received at a time after the activation command and wherein the method further comprises generating, for transmission to the UE, a Layer 1 Reference Signal Received Power (L1-RSRP) starting indication indicating a time when an L1-RSRP report comprising a lowest valid L1 SS-RSRP range for the OD-SSB SCell is to be transmitted to a network based on an invalid L1-RSRP measurement for the OD-SSBs transmitted by the OD-SSB SCell, wherein the L1-RSRP measurement is performed after receiving the OD-SSB indication.
[0144] In a fiftieth example, the method of the forty first example, further comprising generating, for transmission to the UE, an indication of a time to perform a radio frequency (RF) adjustment operation.
[0145] In a fifty first example, the method of the fiftieth example, wherein the time comprises a time from a slot n+1+T_HARQ / NR_slot_length+T_OD-SSB_indication to a slot n +1+ (T_HARQ +3ms+Tx) / NR_slot_length, where NR slot length is with respect to a numerology used in the OD-SSB SCell being activated, Tx is a time to an end of a first complete OD-SSB burst indicated by the OD-SSB indication or preconfigured SS / PBCH Block Measurement Timing Configuration (SMTC) and T_OD-SSB_indication is a time uncertainty from n+T_HARQ / NR_slot_length to a time slot when the OD-SSB indication is received.
[0146] In a fifty second example, the method of the fiftieth example, wherein the time comprises a time from a slot n+1+T_HARQ / NR_slot_length+T_OD-SSB_indication+T_HARQ / NR_slot_length to a slot n +1+ (T_HARQ+3ms+Tx) / NR_slot_length, where NR slot length is with respect to a numerology used in the OD-SSB SCell being activated, Tx is a time to an end of a first complete OD-SSB burst indicated by the OD-SSB indication or preconfigured SS / PBCH Block Measurement Timing Configuration (SMTC) and T_OD-SSB_indication is a time uncertainty from n+T_HARQ / NR_slot_length to a time slot when the OD-SSB indication is received.
[0147] In a fifty third example, the method of the forty first example, wherein the OD-SSB indication is transmitted to the UE before an SCell deactivation timer of the UE has expired.
[0148] In a fifty fourth example, the method of the fifty third example, wherein the OD-SSB indication is transmitted to the UE a predetermined number of slots before the SCell deactivation timer has expired.
[0149] In a fifty fifth example, the method of the fifty fourth example, wherein the predetermined number of slots is determined based on a time delay for the UE to complete an SCell activation procedure.
[0150] In a fifty sixth example, the method of the fifty fourth example, wherein the predetermined number of slots is determined further based on a time interval between transmitting the OD-SSB indication and transmitting a first OD-SSB.
[0151] In a fifty seventh example, a processor configured to perform any of the methods of the forty first through fifty sixth examples.
[0152] In a fifty eighth example, a base station comprising a transceiver configured to communicate with a user equipment (UE) and a processor communicatively coupled to the transceiver and configured to perform any of the methods of the forty first through fifty sixth examples.
[0153] 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 platform 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.
[0154] 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.
[0155] 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.
[0156] 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 signaling received from a network, an activation command to activate an on-demand synchronization signal block (OD-SSB) secondary cell (SCell) ;determine the OD-SSB SCell is transmitting OD-SSBs; andactivate the OD-SSB SCell based on one or more OD-SSBs.2.The apparatus of claim 1, wherein the processing circuitry determines the OD-SSB SCell is transmitting OD-SSBs based on the activation command for the OD-SSB SCell.3.The apparatus of claim 2, wherein the processing circuitry is further configured to:process, based on signaling from the network, a deactivation command to deactivate the OD-SSB SCell.4.The apparatus of claim 3, wherein the processing circuitry is further configured to:determine that the OD-SSB SCell is not transmitting OD-SSBs based on the deactivation command for the OD-SSB SCell.5.The apparatus of claim 3, wherein the processing circuitry is further configured to:process, based on signaling received from the network, an OD-SSB deactivation indication indicating the OD-SSB SCell corresponding to the deactivation command is not transmitting OD-SSBs.6.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the network, an OD-SSB indication, wherein the processing circuitry determines the OD-SSB SCell is transmitting OD-SSBs based on the OD-SSB indication, wherein the OD-SSB SCell begins transmitting OD-SSBs a predetermined time after the OD-SSB indication.7.The apparatus of claim 6, wherein the OD-SSB indication is received at a time after the activation command and wherein the processing circuitry is further configured to:determine that a channel quality indicator (CQI) measurement for the OD-SSBs transmitted by the OD-SSB SCell is not valid, wherein the CQI measurement is performed after receiving the OD-SSB indication; andgenerate, for transmission to the network, an out of range CQI (OOR CQI) report at a first predetermined time after receiving the OD-SSB indication.8.The apparatus of claim 6, wherein the OD-SSB indication is received at a time after the activation command and wherein the processing circuitry is further configured to:determine that a Layer 1 Reference Signal Received Power (L1-RSRP) measurement for the OD-SSBs transmitted by the OD-SSB SCell is not valid, wherein the L1-RSRP measurement is performed after receiving the OD-SSB indication; andgenerate, for transmission to the network, an L1-RSRP report comprising a lowest valid L1 SS-RSRP range for the OD-SSB SCell at a first predetermined time after receiving the OD-SSB indication.9.The apparatus of claim 6, wherein the OD-SSB indication is received at a time after the activation command and wherein the processing circuitry is further configured to:process, based on signaling received from the network, a channel quality indicator (CQI) starting indication indicating a time when an out of range CQI (OOR CQI) report is to be transmitted to the network based on an invalid CQI measurement for the OD-SSBs transmitted by the OD-SSB SCell, wherein the CQI measurement is performed after receiving the OD-SSB indication.10.The apparatus of claim 6, wherein the OD-SSB indication is received at a time after the activation command and wherein the processing circuitry is further configured to:process, based on signaling received from the network, a Layer 1 Reference Signal Received Power (L1-RSRP) starting indication indicating a time when an L1-RSRP report comprising a lowest valid L1 SS-RSRP range for the OD-SSB SCell is to be transmitted to the network based on an invalid L1-RSRP measurement for the OD-SSBs transmitted by the OD-SSB SCell, wherein the L1-RSRP measurement is performed after receiving the OD-SSB indication.11.The apparatus of claim 6, wherein the OD-SSB indication is received at a time after the activation command and wherein the processing circuitry is further configured to:perform a radio frequency (RF) adjustment based on receiving the OD-SSB indication, wherein the RF adjustment does not start until a slot n+1+T_HARQ / NR_slot_length+T_OD-SSB_indication and does not finish until after a slot n +1+ (T_HARQ +3ms+Tx) / NR_slot_length, where NR slot length is with respect to a numerology used in the OD-SSB SCell being activated, Tx is a time to an end of a first complete OD-SSB burst indicated by the OD-SSB indication or preconfigured SS / PBCH Block Measurement Timing Configuration (SMTC) and T_OD-SSB_indication is a time uncertainty from n+T_HARQ / NR_slot_length to a time slot when the OD-SSB indication is received.12.The apparatus of claim 6, wherein the OD-SSB indication is received at a time after the activation command and wherein the processing circuitry is further configured to:perform a radio frequency (RF) adjustment based on receiving the OD-SSB indication, wherein the RF adjustment does not start before slot n+1+T_HARQ / NR_slot_length+T_OD-SSB_indication +T_HARQ / NR_slot_length and not finish after slot n +1+ (T_HARQ +3ms+Tx) / NR_slot_length, where NR slot length is with respect to a numerology used in the OD-SSB SCell being activated, Tx is a time to an end of a first complete OD-SSB burst indicated by the OD-SSB indication or preconfigured SS / PBCH Block Measurement Timing Configuration (SMTC) and T_OD-SSB_indication is a time uncertainty from n+T_HARQ / NR_slot_length to a time slot when the OD-SSB indication is received.13.The apparatus of claim 6, wherein the processing circuitry is further configured to:start an SCell deactivation timer after receiving the OD-SSB indication.14.The apparatus of claim 13, wherein a duration of the SCell deactivation timer is longer than a time uncertainty between {the OD-SSB SCell activation and the OD-SSB indication} + {a legacy SCell activation delay based on SSB} + {a time uncertainty of valid channel quality indicator (CQI) reporting} .15.The apparatus of claim 1, wherein the processing circuitry is further configured to:determine that a dedicated OD-SSB indication was not received within a predetermined period of time from the activation command of the OD-SSB SCell; anddetermine that the OD-SSB SCell is transmitting OD-SSBs at a time starting after the predetermined period of time based on the dedicated OD-SSB indication not being received within the predetermined period of time.16.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the network, a channel quality indicator (CQI) starting indication indicating a time when an out of range CQI (OOR CQI) report is to be transmitted to the network based on an invalid CQI measurement for OD-SSBs transmitted by the OD-SSB SCell, wherein the time is based on a time when the activation command was received, a time for processing the activation command and a time for acknowledging the activation command.17.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the network, a Layer 1 Reference Signal Received Power (L1-RSRP) starting indication indicating a time when an L1-RSRP report comprising a lowest valid L1 SS-RSRP range for the OD-SSB SCell is to be transmitted to the network based on an invalid L1-RSRP measurement for the OD-SSBs transmitted by the OD-SSB SCell, wherein the time is based on a time when the activation command was received, a time to process the activation command and a time to acknowledge the activation command.18.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling from the network, an indication of a time to perform a radio frequency (RF) adjustment operation; andperform the RF adjustment operation starting at the time from the indication.19.The apparatus of claim 1, wherein the processing circuitry id further configured to:start an SCell deactivation timer, wherein a duration of the SCell deactivation timer is longer than a time uncertainty between {the OD-SSB SCell activation and an OD-SSB indication} + {a legacy SCell activation delay based on SSB} + {a time uncertainty of valid channel quality indicator (CQI) reporting} .20.An apparatus comprising processing circuitry configured to:process, based on signaling received from a network, an activation command to activate an on-demand synchronization signal block (OD-SSB) secondary cell (SCell) ;process, based on signaling received from the network, an OD-SSB indication indicating the OD-SSB SCell is transmitting OD-SSBs, wherein the OD-SSB indication comprises a medium access control control element (MAC-CE) having one of a fixed size or a variable size; andactivate the OD-SSB SCell based on one or more OD-SSBs.
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