RRM measurement in network energy saving mode
By determining the spatial relationship between A-SSBs and OD-SSBs and configuring RRM measurements accordingly, the apparatus addresses inefficiencies in NES modes, improving UE connectivity and network energy efficiency through optimized RRM operations.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- APPLE INC
- Filing Date
- 2024-11-05
- Publication Date
- 2026-05-15
AI Technical Summary
Existing network energy saving (NES) modes in New Radio (NR) networks face challenges in efficiently performing Radio Resource Management (RRM) measurements due to the muting of synchronization signal blocks (SSBs) by base stations, which affects UE connectivity and efficiency.
The apparatus determines the spatial relationship between always on Synchronization Signal Blocks (A-SSBs) and on-demand SSBs (OD-SSBs) transmitted by a secondary cell (SCell) and configures RRM measurements to be performed in either a fast or slow mode based on this relationship, activating OD-SSBs as needed for efficient RRM.
Enables efficient RRM measurements by optimizing the mode of SSB-based RRM operations, enhancing UE connectivity and network energy efficiency in NES scenarios.
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Figure CN2024129967_15052026_PF_FP_ABST
Abstract
Description
RRM Measurement in Network Energy Saving ModeBackground
[0001] 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.
[0002] 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
[0003] Some example embodiments are related to an apparatus having processing circuitry configured to determine whether always on Synchronization Signal Blocks (A-SSBs) and on-demand SSBs (OD-SSBs) transmitted by a secondary cell (SCell) have a same spatial relationship and perform Radio Resource Management (RRM) measurements for the OD-SSBs in a fast mode or a slow mode based on whether the A-SSBs and OD-SSBs have the same spatial relationship.
[0004] Other example embodiments are related to an apparatus having processing circuitry configured to generate, for transmission to a user equipment (UE) , a secondary cell (SCell) Synchronization Signal Block (SSB) configuration comprising always on Synchronization Signal Blocks (A-SSBs) and on-demand SSBs (OD-SSBs) transmitted by a secondary cell (SCell) , wherein the SCell SSB configuration further comprises a Radio Resource Management (RRM) measurement configuration for the OD-SSBs comprising RRM measurements to be performed in a fast mode or a slow mode based on a spatial relationship of the A-SSBs and OD-SSBs, activate the OD-SSBs and generate, for transmission to the UE, an indication that the OD-SSBs are activated to indicate that the UE is to perform the RRM measurements on the OD-SSBs according to the RRM measurement configuration.Brief Description of the Drawings
[0005] Fig. 1 shows an example network arrangement according to various example embodiments.
[0006] Fig. 2 shows an example user equipment (UE) according to various example embodiments.
[0007] Fig. 3 shows an example base station according to various example embodiments.
[0008] Fig. 4 shows an example timeline related to NES Case 2 according to various example embodiments.
[0009] Fig. 5A shows a first timeline of a first scenario where always on SSBs (A-SSBs) and OD-SSBs are transmitted with the same transmission (Tx) beam by the network on the same carrier frequency according to various example embodiments.
[0010] Fig. 5B shows a second timeline of the first scenario where the A-SSBs and OD-SSBs are transmitted with the same Tx beam by the network on different carrier frequencies according to various example embodiments.
[0011] Fig. 6A shows a first timeline of a second scenario where the A-SSBs and OD-SSBs are transmitted with different Tx beams by the network on the same carrier frequency according to various example embodiments.
[0012] Fig. 6B shows a second timeline of the second scenario where the A-SSBs and OD-SSBs are transmitted with different Tx beams by the network on different carrier frequencies according to various example embodiments.
[0013] Fig. 7 shows an example method for performing OD-SSB RRM measurements on a secondary cell (SCell) according to various example embodiments.Detailed Description
[0014] 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 a scenario where a secondary cell (SCell) is operating in network energy saving (NES) mode and is configured to transmit always on SSBs and on-demand SSBs. Specifically, the example embodiments relate to a Radio Resource Management (RRM) measurement configuration of a UE in this scenario.
[0015] 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.
[0016] 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.
[0017] 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, e.g., the NES SCell may transmit on-demand SSBs (OD-SSB) .
[0018] The example embodiments are also described with reference to an SCell being known or unknown to a UE. In the example embodiments, the concept of an SCell being known or unknown are similar to the definition of known or unknown SCells as defined in 3GPP Technical Specification (TS) 38.133 section 8.3.2. For example, an SCell in Frequency Range 1 (FR1) is known if it has been meeting the following conditions, (i) during the period equal to max (5*measCycleSCell, 5*DRX cycles) for FR1 before the reception of the SCell activation command, the UE has sent a valid measurement report for the SCell being activated and the SSB measured remains detectable according to the cell identification conditions specified in clauses 9.2 and 9.3 of TS 38.133 and (ii) the SSB measured during the period equal to max(5*measCycleSCell, 5*DRX cycles) also remains detectable during the SCell activation delay according to the cell identification conditions specified in clauses 9.2 and 9.3 of TS 38.133. Otherwise the SCell in FR1 is unknown. For the first SCell activation in Frequency Range 2 (FR2) bands, the SCell is known if it has been meeting the following conditions, (i) during the period equal to 4s for a UE supporting power class 1 / 5 and 3s for a UE supporting power class 2 / 3 / 4 before the UE receives the last activation command for a Physical Downlink Control Channel (PDCCH) Transmission Control Indicator (TCI) , Physical Downlink Shared Channel (PDSCH) TCI (when applicable) and semi-persistent Channel State Information Reference Signals (CSI-RS) for Channel Quality Indicator (CQI) reporting (when applicable) , the UE has sent a valid Layer 3 Reference Signal Received Power (L3-RSRP) measurement report with an SSB index, and the SCell activation command is received after the L3-RSRP reporting and no later than the time when the UE receives a Medium Access Control Control Element (MAC-CE) command for TCI activation, and (ii) during the period from the L3-RSRP reporting to the valid CQI reporting, the reported SSBs with indexes remain detectable according to the cell identification conditions specified in clauses 9.2 and 9.3 of TS 38.133, and the TCI state is selected based on one of the latest reported SSB indexes. Otherwise, the first SCell in the FR2 band is unknown.
[0019] 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. There may be multiple cases for NES operation. In a first case of NES cell operation, the cell may be currently configured to not transmit SSBs but the network may turn on OD-SSBs for this cell (e.g., NES Case 1) . In a second case of NES cell operation, the cell may be currently configured to transmit SSBs (e.g., always on SSBs (A-SSBs) ) but the network may also turn on OD-SSBs for this cell (e.g., NES Case 2) . The example embodiments relate to NES Case 2, e.g., the NES SCell is transmitting A-SSBs but may also transmit OD-SSBs.
[0020] The example embodiments are described with reference to a UE performing RRM measurements for an SCell. The RRM measurements may be Layer 3 (L3) measurements and SCell activation on the A-SSBs and / or OD-SSBs. However, the RRM measurements are not limited to L3 measurements. The example embodiments also support other types of RRM measurements that may be performed by the UE, e.g., SCell time / frequency synchronization, Layer 1 (L1) measurements and SCell activation, etc.
[0021] Some example embodiments provide operations for a UE to perform RRM measurements on OD-SSBs transmitted by an SCell when the SCell also transmits A-SSBs. Specifically, the operations provide for RRM measurements to be performed in a fast mode or a slow mode depending on the various factors including whether the A-SSBs and OD-SSBs have a same spatial relationship, whether the SCell is a known cell or an unknown cell to the UE, etc. Each of these example embodiments will be described in greater detail below.
[0022] 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.
[0023] 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.
[0024] 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. ) .
[0025] 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 and / or gNB 120B) . In the example of Fig. 1, the gNB 120A or gNB 120B may represent any of a PCell, an activated SCell, an SCell to be activated or a deactivated SCell.
[0026] 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.
[0027] 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.
[0028] 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 performing RRM measurements on OD-SSBs transmitted by an SCell that also transmits A-SSBs. The operations include, but are not limited to, determining whether the A-SSBs and OD-SSBs have a same spatial relationship, determining whether the SCell is a known SCell or an unknown SCell, performing RRM measurements in a fast mode under first predefined conditions and performing RRM measurements in a slow mode under second predefined conditions. Each of these example operations will be described in more detail below.
[0029] 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.
[0030] 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.
[0031] 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, decode, or process signals (e.g., signaling from a base station of a network) for implementing any one of the methods described herein.
[0032] 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.
[0033] 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
Claims
1.An apparatus comprising processing circuitry configured to:determine whether always on Synchronization Signal Blocks (A-SSBs) and on-demand SSBs (OD-SSBs) transmitted by a secondary cell (SCell) have a same spatial relationship; andperform Radio Resource Management (RRM) measurements for the OD-SSBs in a fast mode or a slow mode based on whether the A-SSBs and OD-SSBs have the same spatial relationship.2.The apparatus of claim 1, wherein, when the A-SSBs and OD-SSBs have the same spatial relationship, the processing circuitry is further configured to:determine whether the SCell is a known cell or an unknown cell.3.The apparatus of claim 2, wherein, when the SCell is a known cell, the RRM measurements are performed in the slow mode.4.The apparatus of claim 2, wherein, when the SCell is an unknown cell, the RRM measurements are performed in the fast mode.5.The apparatus of claim 2, wherein the processing circuitry is further configured to:generate, for transmission to a network, an indication of whether the SCell is known or unknown.6.The apparatus of claim 2, wherein the processing circuitry is further configured to:generate, for transmission to a network when the processing circuitry determines the SCell is unknown, an indication of a number of OD-SSBs used to make the SCell known.7.The apparatus of claim 1, wherein, when the A-SSBs and OD-SSBs do not have a same spatial relationship, the RRM measurements are performed in the fast mode.8.The apparatus of claim 7, wherein, when a measurement quality of the OD-SSBs is greater than a measurement quality of the A-SSBs, the processing circuitry is further configured to:generate, for transmission to the network, an indication that the measurement quality of the OD-SSBs is greater than the measurement quality of the A-SSBs including an index of the OD-SSBs.9.The apparatus of claim 7, wherein, when a measurement quality of the OD-SSBs is equal to or less than a measurement quality of the A-SSBs, the processing circuitry is further configured to:generate, for transmission to the network, an indication that the A-SSBs are suitable for SCell activation, wherein the indication includes an index of the A-SSBs.10.The apparatus of claim 7, wherein, when a measurement quality of the OD-SSBs is less than or equal to a measurement quality of the A-SSBs, no feedback associated with the RRM measurements of the OD-SSBs is provided to the network.11.The apparatus of claim 1, wherein the processing circuitry is configured to determine the A-SSBs and OD-SSBs have the same spatial relationship based on a definition in standards or an indication received from a network.12.The apparatus of claim 1, wherein the fast mode comprises a measurement sampling rate based on one of (i) one sample per OD-SSB periodicity, (ii) max (40ms, OD-SSB periodicity) or (iii) an SSB-based measurement timing configuration (SMTC) periodicity.13.The apparatus of claim 1, wherein the slow mode comprises a measurement sampling rate based on one of (i) a measCycleSCell configured by a network for RRM measurement on a deactivated SCell or (ii) a measCycleSCell configured by a network for RRM measurement of A-SSBs on a deactivated SCell.14.The apparatus of claim 1, wherein the slow mode comprises the UE stopping performing RRM measurements on the OD-SSBs.15.The apparatus of claim 1, wherein the slow mode comprises the UE stopping performing RRM measurements on the OD-SSBs until the SCell becomes unknown and then resuming RRM measurements on the OD-SSBs.16.The apparatus of claim 1, wherein, when the processing circuitry performs the RRM measurements in the fast mode, the RRM measurements are performed during a predetermined window.17.The apparatus of claim 16, wherein a length of the predetermined window is based on one of (i) a window defined for an SCell having a network energy saving (NES) configuration comprising transmitting OD-SSBs but not A-SSBs or (ii) a configuration received from a network.18.The apparatus of claim 16, wherein a length of the predetermined window is based on M*OD-SSB periodicity, where M=5 in Frequency Range 1 (FR1) , M=40 for power class (PC) 1 or PC 5 in Frequency Range 2-1 (FR2-1) , M=24 for PC 2, PC 3 or PC 4 in FR2-1, M=60 for PC 1 in Frequency Range 2-2 (FR2-2) or M=36 for PC 2 or PC 3 in FR2-2.19.The apparatus of claim 1, wherein, when the A-SSBs and OD-SSBs have the same spatial relationship, the A-SSBs and OD-SSBs are transmitted on a same carrier frequency or on different carrier frequencies.20.The apparatus of claim 1, wherein, when the A-SSBs and OD-SSBs do not have the same spatial relationship, the A-SSBs and OD-SSBs are transmitted on a same carrier frequency or on different carrier frequencies.