Neighbor cell measurement
L1-CMTC synchronizes CSI-RS measurements across neighboring cells, addressing inefficiencies in existing systems by enabling simultaneous measurement and advanced UE capabilities, thereby enhancing network performance and mobility management.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- APPLE INC
- Filing Date
- 2024-11-07
- Publication Date
- 2026-05-15
AI Technical Summary
Existing wireless communication systems face challenges in efficiently measuring Channel State Information Reference Signals (CSI-RS) from neighboring cells due to varying time differences and numerologies, leading to suboptimal network performance and mobility management.
Implementing Layer 1 CSI-RS Measurement Timing Configuration (L1-CMTC) to synchronize and manage CSI-RS resource measurements, allowing simultaneous measurement of CSI-RS resources within a defined time window based on frequency and time configurations, and supporting advanced UE capabilities for handling diverse numerologies and CP types.
Enhances network performance by optimizing CSI-RS measurements, improving handover decisions, and ensuring robust connectivity, especially in scenarios demanding high throughput and low latency.
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Figure CN2024130508_15052026_PF_FP_ABST
Abstract
Description
NEIGHBOR CELL MEASUREMENTTECHNICAL FIELD
[0001] The disclosure generally relates to wireless communication, and more particularly to neighbor cell measurement.BACKGROUND
[0002] Wireless communication networks provide integrated communication platforms and telecommunication services to wireless user devices. Example telecommunication services include telephony, data (e.g., voice, audio, and / or video data) , messaging, and / or other services. The wireless communication networks have wireless access nodes that exchange wireless signals with the wireless user devices using wireless network protocols, such as protocols described in various telecommunication standards promulgated by the Third Generation Partnership Project (3GPP) . Example wireless communication networks include time-division multiple access (TDMA) networks, frequency-division multiple access (FDMA) networks, orthogonal frequency-division multiple access (OFDMA) networks, Long Term Evolution (LTE) , and Fifth Generation New Radio (5G NR) . The wireless communication networks facilitate mobile broadband service using technologies such as OFDM, multiple input multiple output (MIMO) , advanced channel coding, massive MIMO, beamforming, and / or other features.SUMMARY
[0003] According to one innovative aspect of the present disclosure, a method for wireless communication is disclosed. In one aspect, the method can include receiving a Layer 1 Channel State Information Reference Signal (CSI-RS) measurement timing configuration (L1-CMTC) associated with one or more CSI-RS resources and a particular Bandwidth Part (BWP) ; and measuring the one or more CSI-RS resources from one or more neighboring cells based at least on the L1-CMTC.
[0004] Other aspects include a user equipment (UE) , apparatuses, systems, and computer programs for performing the aforementioned method.
[0005] The innovative method can include other optional features. For example, in some implementations, wherein the receiving comprises receiving the L1-CMTC in a Radio Resource Control (RRC) signaling message from a base station.
[0006] In some implementations, wherein the measuring comprises measuring the one or more CSI-RS resources from the one or more neighboring cells during a time window specified by the L1-CMTC in the particular BWP.
[0007] In some implementations, wherein the L1-CMTC comprises one or more of a frequency configuration of the L1-CMTC, a time configuration of the L1-CMTC, or one or more identifiers (IDs) of the one or more CSI-RS resources.
[0008] In some implementations, wherein the frequency configuration comprises one or more of a center frequency and a bandwidth of the L1-CMTC, a lower boundary of the L1-CMTC in a frequency domain and the bandwidth of the L1-CMTC, or the lower boundary of the L1-CMTC and an upper boundary of the L1-CMTC in the frequency domain.
[0009] In some implementations, wherein the time configuration comprises one or more of a time offset from a first slot in a first System Frame Number (SFN) , a periodicity of the L1-CMTC, or a duration of the L1-CMTC.
[0010] In some implementations, wherein the L1-CMTC further comprises a numerology and a Cyclic Prefix (CP) type of each CSI-RS resource configured in the L1-CMTC.
[0011] In some implementations, wherein a plurality of CSI-RS resources configured in the L1-CMTC comprise the same numerology and the same CP type.
[0012] In some implementations, the method further comprising: determining that one or more received time differences (RTDs) among the plurality of CSI-RS resources are less than or equal to a CP duration of the shortest CSI-RS symbol on the same frequency carrier; and in response to the determination, measuring the plurality of CSI-RS resources simultaneously within the L1-CMTC based on a number of the plurality of CSI-RS resources being no more than a known number.
[0013] In some implementations, the method further comprising: determining that at least one received time difference (RTD) among the plurality of CSI-RS resources is greater than a CP duration of the shortest CSI-RS symbol on the same frequency carrier; and in response to the determination, measuring a subset of the plurality of CSI-RS resources within the L1-CMTC simultaneously using downlink timing of a serving cell, wherein the RTD among the subset of CSI-RS resources is greater than the CP duration of the shortest CSI-RS symbol on the same frequency carrier.
[0014] In some implementations, the method further comprising: determining that a received time difference (RTD) among the plurality of CSI-RS resources is greater than a CP duration; and in response to the determination, measuring a subset of the plurality of CSI-RS resources within the L1-CMTC simultaneously using respective timing of the subset of CSI-RS resources, wherein the RTD among the subset of CSI-RS resources is greater than the CP duration.
[0015] In some implementations, wherein at least one of the one or more CSI-RS resources configured in the L1-CMTC comprises a different numerology or a different CP type.
[0016] In some implementations, the method further comprising: measuring, by a baseline UE, a subset of CSI-RS resources simultaneously within the L1-CMTC, wherein the subset of CSI-RS resources comprises the same numerology and the same CP type.
[0017] In some implementations, the method further comprising: measuring, by an advanced UE comprising multiple Fast Fourier Transform (FFT) engines, all the CSI-RS resources simultaneously within the L1-CMTC.
[0018] In some implementations, wherein a number of the FFT engines is equal to a number of numerologies.
[0019] In some implementations, wherein the L1-CMTC is associated with a plurality of CSI-RS resources, the method further comprising: measuring, by a UE comprising multiple receivers operating on a frequency range 2 (FR2) , a subset of the plurality of CSI-RS resources within the L1-CMTC, wherein the subset of CSI-RS resources are received from different transmit (Tx) beams from a base station.
[0020] In some implementations, wherein a number of the subset of CSI-RS resources is at least two.
[0021] In some implementations, the method further comprising: performing BWP switching to a new BWP different from the particular BWP; and measuring the one or more CSI-RS resources during a time window of a new L1-CMTC corresponding to the new BWP.
[0022] In some implementations, wherein the new L1-CMTC comprises a BWP identifier (ID) identifying the new BWP.
[0023] In some implementations, the method further comprising: receiving a new L1-CMTC associated with the one or more CSI-RS resources and the particular BWP; and measuring the one or more CSI-RS resources during a time window of the L1-CMTC and a new time window of the new L1-CMTC in the particular BWP.
[0024] In some implementations, wherein a center frequency of the L1-CMTC is the same as a center frequency of the new L1-CMTC.
[0025] In some implementations, wherein a center frequency of the L1-CMTC is different from a center frequency of the new L1-CMTC.
[0026] According to another innovative aspect of the present disclosure, one or more processors including circuitry to execute one or more instructions that, when executed, cause the one or more processors to perform operations of the aforementioned method are disclosed.
[0027] According to another innovative aspect of the present disclosure, one or more non-transitory computer-readable media storing instructions that, when executed, cause one or more processors to perform operations of the aforementioned method are disclosed.
[0028] The details of one or more embodiments of these systems and methods are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of these systems and methods will be apparent from the description and drawings, and from the claims.
[0029] BRIEF DESCRIPTION OF THE FIGURES
[0030] FIG. 1 illustrates a wireless network, according to some implementations.
[0031] FIG. 2 illustrates an example information element L1-CMTC used in RRC signaling, according to some implementations.
[0032] FIG. 3 illustrates fields included in the example information element L1-CMTC of FIG. 2, according to some implementations.
[0033] FIG. 4 illustrates example L1-CMTC time windows within an active BWP, according to some implementations.
[0034] FIG. 5 illustrates example L1-CMTCs configured with CSI-RS resources having different numerologies, according to some implementations.
[0035] FIG. 6 illustrates example L1-CMTC patterns associated with respective BWPs, according to some implementations.
[0036] FIG. 7A illustrates an example of multiple L1-CMTCs having the same center frequency within the same active BWP, according to some implementations.
[0037] FIG. 7B illustrates an example of multiple L1-CMTCs within the same active BWP, according to some implementations.
[0038] FIG. 8 illustrates an example configuration of L1 CSI-RS measurement period, according to some implementations.
[0039] FIG. 9 illustrates example process of measuring CSI-RS resources from neighboring cells within a time window of L1-CMTC, according to some implementations.
[0040] FIG. 10 is a block diagram of an example UE, according to some implementations.
[0041] FIG. 11 is a block diagram of an example access node, according to some implementations.
[0042] FIG. 12 is a block diagram of an example apparatus, according to some implementations.
[0043] Like reference symbols in the various drawings indicate like elements.DETAILED DESCRIPTION
[0044] This disclosure describes methods and systems for measuring Channel State Information Reference Signal (CSI-RS) resources from neighboring cells within a time window of Layer 1 (L1) CSI-RS measurement timing configuration (L1-CMTC) . The measurement can be performed by a UE operating on Frequency Range 1 (FR1) or Frequency Range 2 (FR2) . L1-CMTC can include frequency configuration (or frequency location) , time configuration (or time location) , and CSI-RS resource identifiers (IDs) associated with CSI-RS resources to be measured within the time window of L1-CMTC. L1-CMTC can further include a numerology (e.g., subcarrier spacing) and a Cyclic Prefix (CP) type of each CSI-RS resource. CSI-RS resources configured in the L1-CMTC can have the same numerology and the same CP type, and can also have different numerologies and / or different CP types.
[0045] In some implementations, CSI-RS resources configured in the L1-CMTC have the same numerology and the same CP type. If received time differences (RTDs) among CSI-RS resources are within a duration of a CP (referred to as “CP duration” ) of the shortest CSI-RS symbol on the same frequency carrier, the UE can measure all these configured CSI-RS resources simultaneously as long as the total number of configured CSI-RS resources is less than or equal to a known number (e.g., a predefined maximum number) of CSI-RS resources that can be measured within the time window of L1-CMTC. If one or more of the RTDs are greater than the CP duration of the shortest CSI-RS symbol on the same frequency carrier, an advanced UE can support the measurement of CSI-RS resources with RTD > CP duration of the shortest CSI-RS symbol on the same frequency carrier. In this context, an advanced UE refers to a UE (such as a smartphone, tablet, or IoT device) that is equipped with enhanced capabilities or features beyond those of a baseline UE. These capabilities enable the advanced UE to support more complex network features, deliver higher performance, and improve user experience, especially in scenarios that demand high throughput, low latency, or robust connectivity. In contrast, a baseline UE refers to a UE with the minimum set of capabilities required to operate in a network. The baseline capabilities are specified by 3GPP standards and serve as a foundation for UEs across different use cases, from smartphones to Internet of Things (IoT) devices.
[0046] If the UE does not support the new capability, several implementations can be provided to measure CSI-RS resources with RTD > CP duration of the shortest CSI-RS symbol on the same frequency carrier. In some examples, the UE can use the serving cell’s downlink (DL) timing to measure target CSI-RS resources with RTD > CP duration of the shortest CSI-RS symbol on the same frequency carrier. In some examples, the UE can follow target CSI-RS timing for measurement. In some examples, measurement requirements (e.g., measurement period, accuracy, etc. ) do not apply, and the UE can determine how to handle the CSI-RS measurement.
[0047] In some implementations, CSI-RS resources configured in the L1-CMTC have different numerologies and / or different CP types. An advanced UE can support simultaneous measurement on CSI-RS resources having different numerologies and / or CP types.
[0048] In some implementations, an advanced UE with multiple receivers (multi-Rx) capability operating on Frequency Range (FR2) can support simultaneous measurement on multiple CSI-RS resources with different spatial information (e.g., multiple CSI-RS resources transmitted using different Tx beams) .
[0049] In some implementations, L1-CMTC is associated with Bandwidth Part (BWP) . L1-CMTC can further include a BWP ID. Each BWP corresponds to its own L1-CMTC pattern (duration, periodicity, bandwidth, time offset, center frequency, etc. ) . When BWP switching occurs, a UE can perform CSI-RS measurement according to an updated L1-CMTC pattern.
[0050] In some implementations, an advanced UE can support multiple L1-CMTCs within the same BWP. The multiple L1-CMTCs can have the same center frequency or different center frequencies.
[0051] FIG. 1 illustrates a wireless network 100, according to some implementations. The wireless network 100 includes a UE 102 and a base station 104 connected via one or more channels 106A, 106B across an air interface 108. The UE 102 and base station 104 communicate using a system that supports controls for managing the access of the UE 102 to a network via the base station 104.
[0052] In some implementations, the wireless network 100 may be a Non-Standalone (NSA) network that incorporates Long Term Evolution (LTE) and Fifth Generation (5G) New Radio (NR) communication standards as defined by the Third Generation Partnership Project (3GPP) technical specifications. For example, the wireless network 100 may be an E-UTRA (Evolved Universal Terrestrial Radio Access) -NR Dual Connectivity (EN-DC) network, or an NR-EUTRA Dual Connectivity (NE-DC) network. In some other implementations, the wireless network 100 may be a Standalone (SA) network that incorporates only 5G NR. Furthermore, other types of communication standards are possible, including future 3GPP systems (e.g., Sixth Generation (6G) ) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 technology (e.g., IEEE 802.11a; IEEE 802.11b; IEEE 802.11g; IEEE 802.11-2007; IEEE 802.11n; IEEE 802.11-2012; IEEE 802.11ac; or other present or future developed IEEE 802.11 technologies) , IEEE 802.16 protocols (e.g., WMAN, WiMAX, etc. ) , or the like. While aspects may be described herein using terminology commonly associated with 5G NR, aspects of the present disclosure can be applied to other systems, such as 3G, 4G, and / or systems subsequent to 5G (e.g., 6G) .
[0053] In the wireless network 100, the UE 102 and any other UE in the system may be, for example, any of laptop computers, smartphones, tablet computers, machine-type devices such as smart meters or specialized devices for healthcare, intelligent transportation systems, or any other wireless device. In network 100, the base station 104 provides the UE 102 network connectivity to a broader network (not shown) . This UE 102 connectivity is provided via the air interface 108 in a base station service area provided by the base station 104. In some implementations, such a broader network may be a wide area network operated by a cellular network provider, or may be the Internet. Each base station service area associated with the base station 104 is supported by one or more antennas integrated with the base station 104. The service areas can be divided into a number of sectors associated with one or more particular antennas. Such sectors may be physically associated with one or more fixed antennas or may be assigned to a physical area with one or more tunable antennas or antenna settings adjustable in a beamforming process used to direct a signal to a particular sector.
[0054] The UE 102 includes control circuitry 110 coupled with transmit circuitry 112 and receive circuitry 114. The transmit circuitry 112 and receive circuitry 114 may each be coupled with one or more antennas. The control circuitry 110 may include various combinations of application-specific circuitry and baseband circuitry. The transmit circuitry 112 and receive circuitry 114 may be adapted to transmit and receive data, respectively, and may include radio frequency (RF) circuitry and / or front-end module (FEM) circuitry.
[0055] In various implementations, aspects of the transmit circuitry 112, receive circuitry 114, and control circuitry 110 may be integrated in various ways to implement the operations described herein. The control circuitry 110 may be adapted or configured to perform various operations, such as those described elsewhere in this disclosure related to a UE. For instance, the control circuitry 110 can estimate CSI in response to CSI-RS from the base station 104.
[0056] Additionally, the transmit circuitry 112 may transmit using a plurality of multiplexed uplink physical channels. The plurality of uplink physical channels may be multiplexed, e.g., according to time division multiplexing (TDM) or frequency division multiplexing (FDM) along with carrier aggregation. The transmit circuitry 112 may be configured to receive block data from the control circuitry 110 for transmission across the air interface 108.
[0057] The receive circuitry 114 may receive a plurality of multiplexed downlink physical channels from the air interface 108 and relay the physical channels to the control circuitry 110. The plurality of downlink physical channels may be multiplexed, e.g., according to TDM or FDM along with carrier aggregation. The transmit circuitry 112 and the receive circuitry 114 may transmit and receive, respectively, both control data and content data (e.g., messages, images, video, etc. ) structured within data blocks that are carried by the physical channels.
[0058] FIG. 1 also illustrates the base station 104. In some implementations, the base station 104 may be a 5G radio access network (RAN) , a next-generation RAN, an E-UTRAN, a non-terrestrial cell, or a legacy RAN, such as a UTRAN. As used herein, the term “5G RAN” or the like may refer to the base station 104 that operates in an NR or 5G wireless network 100, and the term “E-UTRAN” or the like may refer to a base station 104 that operates in an LTE or 4G wireless network 100. The UE 102 utilizes connections (or channels) 106A, 106B, each of which includes a physical communications interface or layer.
[0059] The base station 104 circuitry may include control circuitry 116 coupled with transmit circuitry 118 and receive circuitry 120. The transmit circuitry 118 and receive circuitry 120 may each be coupled with one or more antennas that may be used to enable communications via the air interface 108. The transmit circuitry 118 and receive circuitry 120 may be adapted to transmit and receive data, respectively, to any UE connected to the base station 104. The receive circuitry 120 may receive a plurality of uplink physical channels from one or more UEs, including the UE 102.
[0060] In FIG. 1, the one or more channels 106A, 106B are illustrated as an air interface to enable communicative coupling, and can be consistent with cellular communications protocols, such as a UMTS protocol, a 3GPP LTE protocol, an Advanced long term evolution (LTE-A) protocol, a LTE-based access to unlicensed spectrum (LTE-U) , a 5G protocol, a NR protocol, an NR-based access to unlicensed spectrum (NR-U) protocol, and / or any other communications protocol (s) . In implementations, the UE 102 may directly exchange communication data via a ProSe interface. The ProSe interface may alternatively be referred to as a sidelink (SL) interface and may include one or more logical channels, including but not limited to a Physical Sidelink Control Channel (PSCCH) , a Physical Sidelink Discovery Channel (PSDCH) , and a Physical Sidelink Broadcast Channel (PSBCH) .
[0061] L1 CSI-RS Measurement Timing Configuration (L1-CMTC)
[0062] L1-CMTC can be used to measure CSI-RS resources from neighboring cells, evaluate channel quality, and assist with mobility management tasks such as handovers and dual connectivity. CSI-RS measurements allow the network to make informed decisions about cell transitions, ensuring that the UE remains connected to the most optimal cell as it moves.
[0063] In some implementations, L1-CMTC is configured by the network via Radio Resource Control (RRC) signaling. FIG. 2 illustrates an example information element L1-CMTC used in RRC signaling, according to some implementations. FIG. 3 illustrates fields included in the example information element L1-CMTC of FIG. 2, according to some implementations. In some implementations, L1-CMTC can include frequency configuration, time configuration, and one or more CSI-RS resource identifiers (IDs) (e.g., CSI-ResourceConfigId) representing one or more CSI-RS resources configured within the L1-CMTC. In some implementations, L1-CMTC can further include a numerology and a CP type for each CSI-RS resource. The frequency configuration includes (i) a center frequency and a bandwidth of L1-CMTC, (ii) a lower boundary of L1-CMTC in a frequency domain and a bandwidth, or (iii) a lower boundary and an upper boundary of L1-CMTC in a frequency domain. The time configuration includes a time offset, a periodicity, and a duration of L1-CMTC. The time offset (unit: ms) refers to the starting point of the first L1-CMTC window in a time domain from System Frame Number (SFN) #0, slot#0. The periodicity is configured with a predefined value, e.g., 5ms, 10ms, …, 160ms. The duration can be 1ms-5ms.
[0064] FIG. 4 illustrates example L1-CMTC time windows within an active BWP, according to some implementations. An active BWP is a specific portion of the carrier bandwidth where the UE is currently operating. Each BWP has a defined center frequency 401 around which its bandwidth 403 is allocated. The L1-CMTC time window 402 starts at a time point having a time offset 409 from SFN #0, slot#0. CSI-RS #1 and CSI-RS #2 are measured within the L1-CMTC time window 402. CSI-RS #1 is measured within the L1-CMTC time window 404. CSI-RS #1 and CSI-RS #2 are measured within the L1-CMTC time window 406. CSI-RS #3 is outside the L1-CMTC time window, e.g., L1-CMTC time window 402 and L1-CMTC time window 406, and thus cannot be measured. L1-CMTC time window 402, L1-CMTC time window 404, L1-CMTC time window 406, etc., are repeated periodically, with a periodicity 405. Each L1-CMTC time window has the same duration 407.
[0065] In some implementations, a numerology and a CP type of a CSI-RS resource can be specified in a CSI-RS resource configuration. The numerology refers to subcarrier spacing (SCS) , which can vary based on the use case and deployment requirements. For example, subcarrier spacings can include 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, and 960 kHz, etc. A CP is an extension added at the beginning of each OFDM (Orthogonal Frequency-Division Multiplexing) symbol. It acts as a guard interval that allows management of the effects of multipath propagation, where signals reflect off objects and arrive at slightly different times. By adding the CP, the wireless network 100 can handle these delayed signals more effectively, reducing Inter-Symbol Interference (ISI) and improving signal quality. The CP type for CSI-RS can be either a Normal CP or an Extended CP. The Normal CP is used in typical deployments, whereas the Extended CP is beneficial in scenarios with large delay spreads, such as in urban or mountainous areas.
[0066] In some implementations, CSI-RS resources that are configured in the L1-CMTC (CSI-RS resources to be measured within a duration or a time window of the L1-CMTC) have the same numerology and the same CP type. The numerology and the CP type can also be specified in the L1-CMTC configuration.
[0067] In some implementations, CSI-RS resources that are configured in the L1-CMTC have different numerologies and CP types.
[0068] L1 CSI-RS Measurement In FR1 Based On L1-CMTC
[0069] L1 measurement refers to layer 1 measurements on CSI-RS signals performed by the UE. The UE measures Reference Signal Received Power (RSRP) , Reference Signal Received Quality (RSRQ) , and Signal to Interference plus Noise Ratio (SINR) on CSI-RS resources to provide the network with detailed channel state information, which is used to optimize beam selection, handovers, and link adaptation.
[0070] Same Numerology and CP type within L1-CMTC
[0071] In some implementations, a UE is operating on FR1. The numerology and CP type of CSI-RS resources configured in the L1-CMTC are the same. The RTDs among CSI-RS resources are within a CP duration, which indicates that a delay between the arrival times of CSI-RS signals at the receiver of the UE is shorter than a CP duration. The UE can measure these CSI-RS resources simultaneously as long as the total CSI-RS resources configured within an L1-CMTC time window do not exceed a new UE capability (or a new feature) , which indicates the maximum number of CSI-RS resources that can be measured within one L1-CMTC time window. The L1-CMTC time window defines a specific start time and duration for the UE to measure CSI-RS resources. The new UE capability can be defined for each UE, each FR, each frequency band, each band combination (BC) , or each feature set (FS) . “BC” indicates that the new UE capability (e.g., the maximum number of CSI-RS resources) is signaled for each frequency band combination. “FS” indicates that the new UE capability (e.g., the maximum number of CSI-RS resources) is signaled for each frequency band in each frequency band combination.
[0072] In some implementations, a UE is operating on FR1. The numerology and CP type of CSI-RS resources configured in the L1-CMTC are the same. Not all RTDs among CSI-RS resources are within a CP duration, indicating a delay between the arrival times of CSI-RS signals at the receiver of the UE > CP duration. A baseline UE is not required to measure CSI-RS resources with RTD > CP duration, and thus a new UE capability is introduced to support measurement of CSI-RS resources with RTD > CP duration.
[0073] If the UE does not support the new capability, several implementations can be provided to measure CSI-RS resources with RTD > CP. In some examples, the UE can use the serving cell’s downlink (DL) timing to measure target CSI-RS resources with RTD > CP, which may result in accuracy degradation in CSI-RS measurement. In some examples, the UE can follow target CSI-RS timing for measurement. While CSI-RS measurement accuracy can be guaranteed, the UE may not be able to receive the serving cell’s DL signal. Scheduling restriction applies to CSI-RS symbols and one additional symbol before and after the CSI-RS symbols so that the UE can accurately measure the CSI-RS without interference or scheduling conflicts from other transmissions. In some examples, measurement requirements (e.g., measurement period, accuracy, etc. ) do not apply, and the UE can determine how to handle the CSI-RS measurement.
[0074] Different Numerologies and CP types within L1-CMTC
[0075] In some implementations, the UE is operating on FR1. Not all the numerologies and CP types of CSI-RS resources configured in the L1-CMTC are the same. RTD handling is the same as the RTD handling when the numerology and CP type of all the CSI-RS resources within L1-CMTC are the same.
[0076] In some examples, a baseline UE can only measure CSI-RS resources having the same numerology and the same CP type simultaneously, and it fails to measure CSI-RS resources having different numerologies and / or different CP types.
[0077] In some examples, a new UE capability (or a new feature) is introduced to indicate support for simultaneous measurement of CSI-RS resources from neighbor cells with different numerologies and / or CP types. An advanced UE can include multiple Fast Fourier Transform (FFT) engines, and each FFT engine corresponds to a respective set of CSI-RS resources having the same numerology and / or the same CP type. For example, an advanced UE includes two FFT engines. One FFT engine corresponds to CSI-RS resources having a numerology of 15kHz, while the other FFT engine corresponds to CSI-RS resources having a numerology of 30kHz.
[0078] In some examples, one UE capability is introduced for a different numerology, while another UE capability is introduced for a different CP type. In some examples, one UE capability can be used for both numerology and CP type. The new UE capability can be specified for each UE, each FR, each frequency band, each band combination (BC) , or each feature set (FS) . “BC” indicates that the new UE capability (e.g., numerology and / or CP type) is signaled for each frequency band combination. “FS” indicates that the new UE capability (e.g., numerology and / or CP type) is signaled for each frequency band in each frequency band combination.
[0079] FIG. 5 illustrates example L1-CMTCs configured with CSI-RS resources having different numerologies, according to some implementations. L1-CMTC 502 is configured with two CSI-RS resources having different numerologies. For example, CSI-RS #1 has a subcarrier spacing of 15kHz, while CSI-RS #2 has a subcarrier spacing of 30kHz. CSI-RS #1 periodicity (e.g., 5ms) is 1 / 2 of CSI-RS #2 periodicity (e.g., 10ms) . A baseline UE can only measure CSI-RS resources with the same numerology, and thus the baseline UE can only measure CSI-RS #2, while ignoring CSI-RS #1. L1-CMTC 504 is configured with CSI-RS #1, and thus the baseline UE measures CSI-RS #1 during a time window of L1-CMTC 504. L1-CMTC 506 is configured with CSI-RS #1 and CSI-RS #2. The baseline UE can only measure CSI-RS #2.
[0080] L1 CSI-RS Measurement In FR2 Based On L1-CMTC
[0081] In some implementations, a UE is operating on FR2. The above-mentioned implementations for FR1 also apply to FR2. In some implementations, a baseline UE can only measure CSI-RS resources that are transmitted by the network using the same transmit (Tx) beam. For example, the baseline UE can only measure CSI-RS resources in the same Quasi Co-Located (QCL) chain or CSI-RS resources having the same QCL source (e.g., CSI-RS resources associated with the same Synchronization Signal Block (SSB) ) .
[0082] In some implementations, an advanced UE with multiple receivers (multi-Rx) capability can support simultaneous measurement on multiple CSI-RS resources with different spatial information (e.g., multiple CSI-RS resources transmitted using different Tx beams) . In some examples, legacy UE capability (e.g., simultaneousReceptionDiffTypeD-r16 or mTRP-GroupBasedL1-RSRP-r17 defined in 3GPP TS38.306) can be reused, and a UE can simultaneously measure up to two CSI-RS resources with different spatial information. In some examples, a new UE capability or a new feature is used to indicate support of simultaneous measurement on multiple CSI-RS resources with different spatial information. The new UE capability can be a single-bit capability to indicate support of simultaneous measurement on up to two CSI-RS resources with different spatial information. The new UE capability can also be an integer value (e.g., 8) to indicate the maximum number of CSI-RS resources with different spatial information that can be measured simultaneously.
[0083] Association Between L1-CMTC and BWP
[0084] In some implementations, L1-CMTC is associated with BWP configuration. For example, L1 CSI-RS measurement performed only within active BWP can be supported in Release 19 (or as a baseline) . When BWP switching occurs in the frequency domain, L1-CMTC is also updated accordingly. Each BWP corresponds to its own L1-CMTC pattern. In some examples, L1-CMTC configuration can include a BWP ID. Since there is only one active BWP at a time, a UE performs CSI-RS measurement according to the L1-CMTC that is associated with active BWP. When BWP switching occurs, the UE can perform CSI-RS measurement according to an updated L1-CMTC pattern.
[0085] FIG. 6 illustrates example L1-CMTC patterns associated with respective BWPs, according to some implementations. BWP1 is associated with L1-CMTC #1, BWP2 is associated with L1-CMTC #2, and BWP3 is associated with L1-CMTC #3. Each L1-CMTC (L1-CMTC #1, L1-CMTC #2, and L1-CMTC #3) has a different pattern, e.g., different durations, different periodicities, different center frequencies, different bandwidth, etc. When BWP1 is active, the UE performs CSI-RS measurement according to L1-CMTC #1. When BWP2 is active, the UE performs CSI-RS measurement according to L1-CMTC #2. When BWP3 is active, the UE performs CSI-RS measurement according to L1-CMTC #3.
[0086] Support Multiple L1-CMTCs Within Same BWP
[0087] A new UE capability can be used to indicate support of multiple L1-CMTCs within the same BWP. In some examples, a new UE capability X1 is used to indicate support for multiple L1-CMTCs on the same layer (or the same carrier frequency or the same center frequency) . For example, one single bit is used to indicate that a UE can be configured with two L1-CMTCs on the same layer within the same BWP. For another example, an integer value is used to indicate the number of L1-CMTCs on the same layer within the same BWP.
[0088] FIG. 7A illustrates an example of multiple L1-CMTCs having the same center frequency within the same active BWP, according to some implementations. The UE can perform CSI-RS measurements within time windows of L1-CMTC #1 and L1-CMTC #2. L1-CMTC #1 and L1-CMTC #2 have the same center frequency.
[0089] In some examples, a new UE capability X2 is used to indicate support of multiple L1-CMTCs within the same BWP. For example, one single bit indicates that the UE can be configured with two L1-CMTCs within the same BWP. For another example, an integer value is used to indicate the number of L1-CMTCs within the same BWP.
[0090] FIG. 7B illustrates an example of multiple L1-CMTCs within the same active BWP, according to some implementations. A UE can perform CSI-RS measurements within time windows of L1-CMTC #1 and L1-CMTC #2. As shown in FIG. 7B, L1-CMTC #1 and L1-CMTC #2 have different center frequencies. In some examples, L1-CMTC #1 and L1-CMTC #2 can also have the same center frequency, as shown in FIG. 7A.
[0091] CSI-RS Measurement Period Defined Based On L1-CMTC
[0092] In some implementations, the L1 CSI-RS measurement period can be defined based on L1-CMTC. FIG. 8 illustrates an example configuration of L1 CSI-RS measurement period, according to some implementations. The definitions of the parameters Treport, Nlayer, TDRX, K, and P (P is a scaling factor considering overlapping with a gap. ) are described in 3GPP TS38.133 clause 9.14.
[0093] FIG. 9 illustrates example process 900 of measuring CSI-RS resources from neighboring cells within a time window of L1-CMTC, according to some implementations. The process 900 is described as being performed by a UE, such as UE 102 of FIG. 1, or UE 1000 of FIG. 10 that is described in the following sections. The process 900 can be modified or reconfigured to include additional, fewer, or different steps, which can be performed in the order shown or in a different order.
[0094] At 902, the UE receives an L1-CMTC associated with one or more CSI-RS resources and a particular BWP. The UE receives the L1-CMTC from a base station, and the L1-CMTC is received in a RRC signaling message.
[0095] At 904, the UE measures the one or more CSI-RS resources from one or more neighboring cells based at least on the L1-CMTC. The UE measures the one or more CSI-RS resources from the one or more neighboring cells during a time window of the L1-CMTC in the particular BWP.
[0096] In some implementations, the L1-CMTC can include one or more of a frequency configuration of the L1-CMTC, a time configuration of the L1-CMTC, or one or more IDs of the one or more CSI-RS resources. The frequency configuration can include one or more of a center frequency and a bandwidth of the L1-CMTC, a lower boundary of the L1-CMTC in a frequency domain and the bandwidth of the L1-CMTC, or the lower boundary of the L1-CMTC and an upper boundary of the L1-CMTC in the frequency domain. The time configuration can include one or more of a time offset from a first slot in a first SFN, a periodicity of the L1-CMTC, or a duration of the L1-CMTC. The L1-CMTC can further include a numerology and a CP type of each CSI-RS resource configured in the L1-CMTC.
[0097] In some implementations, CSI-RS resources configured in the L1-CMTC can have the same numerology and the same CP type. In some examples, the UE determines that one or more RTDs among the plurality of CSI-RS resources are less than or equal to a CP duration. In response to the determination, the UE measures the plurality of CSI-RS resources simultaneously within the L1-CMTC based on a number of the plurality of CSI-RS resources being no more than a known number (e.g., the maximum number of CSI-RS resources that can be measured within the L1-CMTC) . In some examples, the UE determines that at least one RTD among the plurality of CSI-RS resources is greater than a CP duration. In response to the determination, the UE measures a subset of the plurality of CSI-RS resources within the L1-CMTC simultaneously, using the downlink timing of a serving cell or using the respective timing of the subset of CSI-RS resources. The RTD among the subset of CSI-RS resources is greater than the CP duration.
[0098] In some implementations, CSI-RS resources configured in the L1-CMTC can have different numerologies or different CP types. The baseline UE can measure a subset of CSI-RS resources simultaneously within the L1-CMTC. The subset of CSI-RS resources has the same numerology and the same CP type. The baseline UE is unable to measure CSI-RS resources having a different numerology and / or a different CP type. The advanced UE can include multiple FFT engines and can measure all the CSI-RS resources (including CSI-RS resources having the same numerology and the same CP type and CSI-RS resources having a different numerology and / or a different CP type) simultaneously within the L1-CMTC. The number of the FFT engines included in the advanced UE is equal to the number of numerologies of CSI-RS resources configured in the L1-CMTC.
[0099] In some implementations, the UE that includes multiple receivers and operates on FR2 can measure a subset of CSI-RS resources within the L1-CMTC. The subset of CSI-RS resources are received from different Tx beams. The subset of CSI-RS resources includes two or more CSI-RS resources.
[0100] In some implementations, a BWP is associated with a different L1-CMTC pattern. Each BWP corresponds to its own L1-CMTC pattern. L1-CMTC can further include a BWP ID. The UE can perform BWP switching to a new BWP that is different from the particular BWP. The UE can measure the one or more CSI-RS resources during a time window of a new L1-CMTC corresponding to the new BWP. The new L1-CMTC includes a BWP ID identifying the new BWP.
[0101] In some implementations, a BWP can correspond to multiple L1-CMTCs. The UE can receive a new L1-CMTC associated with the one or more CSI-RS resources and the particular BWP and measure the one or more CSI-RS resources during a time window of the L1-CMTC and a new time window of the new L1-CMTC in the particular BWP. The center frequency of the L1-CMTC can be the same as the center frequency of the new L1-CMTC. The center frequency of the L1-CMTC can also be different from the center frequency of the new L1-CMTC.
[0102] FIG. 10 illustrates an example UE 1000, according to some implementations. The UE 1000 may be similar to and substantially interchangeable with UE 102 of FIG. 1.
[0103] The UE 1000 may be any mobile or non-mobile computing device, such as, for example, mobile phones, computers, tablets, industrial wireless sensors (for example, microphones, pressure sensors, thermometers, motion sensors, accelerometers, inventory sensors, electric voltage / current meters, etc. ) , video devices (for example, cameras, video cameras, etc. ) , wearable devices (for example, a smartwatch) , relaxed-IoT devices.
[0104] The UE 1000 may include processor circuitry 1002, RF interface circuitry 1004, memory / storage 1006, user interface 1008, sensors 1010, driver circuitry 1012, power management integrated circuit (PMIC) 1014, one or more antenna (s) 1016, and battery 1018. The components of the UE 1000 may be implemented as integrated circuits (ICs) , portions thereof, discrete electronic devices, or other modules, logic, hardware, software, firmware, or a combination thereof. The block diagram of FIG. 10 is intended to show a high-level view of some of the components of the UE 1000. However, some of the components shown may be omitted, additional components may be present, and different arrangements of the components shown may occur in other implementations.
[0105] The components of the UE 1000 may be coupled with various other components over one or more interconnects 1020, which may represent any type of interface, input / output, bus (local, system, or expansion) , transmission line, trace, optical connection, etc., that allows various circuit components (on common or different chips or chipsets) to interact with one another.
[0106] The processor circuitry 1002 may include processor circuitry such as, for example, baseband processor circuitry (BB) 1022A, central processor unit circuitry (CPU) 1022B, and graphics processor unit circuitry (GPU) 1022C. The processor circuitry 1002 may include any type of circuitry, or processor circuitry that executes or otherwise operates computer-executable instructions, such as program code, software modules, or functional processes from memory / storage 1006 to cause the UE 1000 to perform operations as described herein.
[0107] In some implementations, the baseband processor circuitry 1022A may access a communication protocol stack 1024 in the memory / storage 1006 to communicate over a 3GPP-compatible network. In general, the baseband processor circuitry 1022A may access the communication protocol stack to: perform user plane functions at a physical (PHY) layer, medium access control (MAC) layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, service data adaptation protocol (SDAP) layer, and PDU layer; and perform control plane functions at a PHY layer, MAC layer, RLC layer, PDCP layer, RRC layer, and a non-access stratum layer. In some implementations, the PHY layer operations may additionally / alternatively be performed by the components of the RF interface circuitry 1004. The baseband processor circuitry 1022A may generate or process baseband signals or waveforms that carry information in 3GPP-compatible networks. In some implementations, the waveforms for NR may be based on cyclic prefix orthogonal frequency division multiplexing (OFDM) “CP-OFDM” in the uplink or downlink, and discrete Fourier transform spread OFDM “DFT-S-OFDM” in the uplink.
[0108] The memory / storage 1006 may include one or more non-transitory, computer-readable media that include instructions (for example, communication protocol stack 1024) that may be executed by one or more of the processor circuitry 1002 to cause the UE 1000 to perform various operations described herein. The memory / storage 1006 includes any type of volatile or non-volatile memory that may be distributed throughout the UE 1000. In some implementations, some of the memory / storage 1006 may be located on the processor circuitry 1002 itself (for example, L1 and L2 cache) , while other memory / storage 1006 is external to the processor circuitry 1002 but accessible thereto via a memory interface. The memory / storage 1006 may include any suitable volatile or non-volatile memory such as, but not limited to, dynamic random access memory (DRAM) , static random access memory (SRAM) , erasable programmable read-only memory (EPROM) , electrically erasable programmable read-only memory (EEPROM) , Flash memory, solid-state memory, or any other type of memory device technology.
[0109] The RF interface circuitry 1004 may include transceiver circuitry and a radio frequency front module (RFEM) that allows the UE 1000 to communicate with other devices over a radio access network. The RF interface circuitry 1004 may include various elements arranged in transmit or receive paths. These elements may include, for example, switches, mixers, amplifiers, filters, synthesizer circuitry, control circuitry, etc.
[0110] In the receive path, the RFEM may receive a radiated signal from an air interface via antenna (s) 1016 and proceed to filter and amplify (with a low-noise amplifier) the signal. The signal may be provided to a receiver of the transceiver that downconverts the RF signal into a baseband signal that is provided to the baseband processor of the processor circuitry 1002.
[0111] In the transmit path, the transmitter of the transceiver up-converts the baseband signal received from the baseband processor and provides the RF signal to the RFEM. The RFEM may amplify the RF signal through a power amplifier prior to the signal being radiated across the air interface via the antenna (s) 1016. In various implementations, the RF interface circuitry 1004 may be configured to transmit / receive signals in a manner compatible with NR access technologies.
[0112] The antenna (s) 1016 may include one or more antenna elements to convert electrical signals into radio waves to travel through the air and to convert received radio waves into electrical signals. The antenna elements may be arranged into one or more antenna panels. The antenna (s) 1016 may have antenna panels that are omnidirectional, directional, or a combination thereof to enable beamforming and multiple input, multiple output communications. The antenna (s) 1016 may include microstrip antennas, printed antennas fabricated on the surface of one or more printed circuit boards, patch antennas, phased array antennas, etc. The antenna (s) 1016 may have one or more panels designed for specific frequency bands including bands in FR1 or FR2.
[0113] The user interface 1008 includes various input / output (I / O) devices designed to enable user interaction with the UE 1000. The user interface 1008 includes input device circuitry and output device circuitry. Input device circuitry includes any physical or virtual means for accepting an input including, inter alia, one or more physical or virtual buttons (for example, a reset button) , a physical keyboard, keypad, mouse, touchpad, touchscreen, microphones, scanner, headset, or the like. The output device circuitry includes any physical or virtual means for showing information or otherwise conveying information, such as sensor readings, actuator position (s) , or other like information. Output device circuitry may include any number or combinations of audio or visual displays, including, inter alia, one or more simple visual outputs / indicators (for example, binary status indicators such as light emitting diodes “LEDs” and multi-character visual outputs) , or more complex outputs such as display devices or touchscreens (for example, liquid crystal displays “LCDs, ” LED displays, quantum dot displays, projectors, etc. ) , with the output of characters, graphics, multimedia objects, and the like being generated or produced from the operation of the UE 1000.
[0114] The sensors 1010 may include devices, modules, or subsystems whose purpose is to detect events or changes in their environment and send the information (sensor data) about the detected events to some other device, module, subsystem, etc. Examples of such sensors include, inter alia, inertia measurement units including accelerometers, gyroscopes, or magnetometers; microelectromechanical systems or nanoelectromechanical systems including 3-axis accelerometers, 3-axis gyroscopes, or magnetometers; level sensors; temperature sensors (for example, thermistors) ; pressure sensors; image capture devices (for example, cameras or lensless apertures) ; light detection and ranging sensors; proximity sensors (for example, infrared radiation detector and the like) ; depth sensors; ambient light sensors; ultrasonic transceivers; microphones or other like audio capture devices; etc.
[0115] The driver circuitry 1012 may include software and hardware elements that operate to control particular devices that are embedded in the UE 1000, attached to the UE 1000, or otherwise communicatively coupled with the UE 1000. The driver circuitry 1012 may include individual drivers allowing other components to interact with or control various input / output (I / O) devices that may be present within, or connected to, the UE 1000. For example, driver circuitry 1012 may include a display driver to control and allow access to a display device, a touchscreen driver to control and allow access to a touchscreen interface, sensor drivers to obtain sensor readings of sensors 1010 and control and allow access to sensors 1010, drivers to obtain actuator positions of electro-mechanic components or control and allow access to the electro-mechanic components, a camera driver to control and allow access to an embedded image capture device, audio drivers to control and allow access to one or more audio devices.
[0116] The PMIC 1014 may manage power provided to various components of the UE 1000. In particular, with respect to the processor circuitry 1002, the PMIC 1014 may control power-source selection, voltage scaling, battery charging, or DC-to-DC conversion.
[0117] In some implementations, the PMIC 1014 may control, or otherwise be part of, various power-saving mechanisms of the UE 1000. A battery 1018 may power the UE 1000, although in some examples the UE 1000 may be mounted deployed in a fixed location, and may have a power supply coupled to an electrical grid. The battery 1018 may be a lithium-ion battery, a metal-air battery, such as a zinc-air battery, an aluminum-air battery, a lithium-air battery, and the like. In some implementations, such as in vehicle-based applications, the battery 1018 may be a typical lead-acid automotive battery.
[0118] FIG. 11 illustrates an example access node 1100 (e.g., a base station or gNB) , according to some implementations. The access node 1100 may be similar to and substantially interchangeable with base station 104. The access node 1100 may include processor circuitry 1102, RF interface circuitry 1104, CN interface circuitry 1106, memory / storage circuitry 1108, and one or more antenna (s) 1110.
[0119] The components of the access node 1100 may be coupled with various other components over one or more interconnects 1112. The processor circuitry 1102, RF interface circuitry 1104, memory / storage circuitry 1108 (including communication protocol stack 1114) , antenna (s) 1110, and interconnects 1112 may be similar to like-named elements shown and described with respect to FIG. 10. For example, the processor circuitry 1102 may include processor circuitry such as, for example, baseband processor circuitry (BB) 1116A, central processor unit circuitry (CPU) 1116B, and graphics processor unit circuitry (GPU) 1116C.
[0120] The CN interface circuitry 1106 may provide connectivity to a core network, for example, a 5th Generation Core network (5GC) using a 5GC-compatible network interface protocol such as carrier Ethernet protocols, or some other suitable protocol. Network connectivity may be provided to / from the access node 1100 via a fiber optic or wireless backhaul. The CN interface circuitry 1106 may include one or more dedicated processors or FPGAs to communicate using one or more of the aforementioned protocols. In some implementations, the CN interface circuitry 1106 may include multiple controllers to provide connectivity to other networks using the same or different protocols.
[0121] As used herein, the terms “access node, ” “access point, ” or the like may describe equipment that provides the radio baseband functions for data and / or voice connectivity between a network and one or more users. These access nodes can be referred to as BS, gNBs, RAN nodes, eNBs, NodeBs, RSUs, TRxPs or TRPs, and so forth, and can include ground stations (e.g., terrestrial access points) or satellite stations providing coverage within a geographic area (e.g., a cell) . As used herein, the term “NG RAN node” or the like may refer to an access node 1100 that operates in an NR or 5G system (for example, a gNB) , and the term “E-UTRAN node” or the like may refer to an access node 1100 that operates in an LTE or 4G system (e.g., an eNB) . According to various implementations, the access node 1100 may be implemented as one or more of a dedicated physical device such as a macrocell base station, and / or a low power (LP) base station for providing femtocells, picocells or other like cells having smaller coverage areas, smaller user capacity, or higher bandwidth compared to macrocells.
[0122] In some implementations, all or parts of the access node 1100 may be implemented as one or more software entities running on server computers as part of a virtual network, which may be referred to as a CRAN and / or a virtual baseband unit pool (vBBUP) . In these implementations, the CRAN or vBBUP may implement a RAN function split, such as a PDCP split wherein RRC and PDCP layers are operated by the CRAN / vBBUP and other L2 protocol entities are operated by the access node 1100; a MAC / PHY split wherein RRC, PDCP, RLC, and MAC layers are operated by the CRAN / vBBUP and the PHY layer is operated by the access node 1100; or a “lower PHY” split wherein RRC, PDCP, RLC, MAC layers and upper portions of the PHY layer are operated by the CRAN / vBBUP and lower portions of the PHY layer are operated by the access node 1100.
[0123] In V2X scenarios, the access node 1100 may be or act as RSUs. The term “RoadSide Unit” or “RSU” may refer to any transportation infrastructure entity used for V2X communications. An RSU may be implemented in or by a suitable RAN node or a stationary (or relatively stationary) UE, where an RSU implemented in or by a UE may be referred to as a “UE-type RSU, ” an RSU implemented in or by an eNB may be referred to as an “eNB-type RSU, ” an RSU implemented in or by a gNB may be referred to as a “gNB-type RSU, ” and the like.
[0124] FIG. 12 is a block diagram of an example apparatus 1200, according to some implementations. In some implementations, the apparatus 1200 includes a baseband processor circuitry. For example, the apparatus 1200 may be similar to the baseband processor circuitry (BB) 1022A of FIG. 10 or the baseband processor circuitry (BB) 1116A of FIG. 11 in some cases.
[0125] As shown, the apparatus 1200 includes one or more processors 1216 (processor 1216A, processor 1216B, etc. ) , and memory / storage 1208 storing instructions 1214 that are executed by the one or more processors 1216A and 1216B. Although FIG. 12 illustrates the apparatus 1200 as having multiple processors, in some cases the apparatus 1200 can include a single processor (e.g., one of processor 1216A or processor 1216B) .
[0126] The apparatus 1200 is electrically and communicatively coupled, through RF interface 1212, to RF circuitry 1204 and associated antenna structure 1210. In some implementations, one or more of the processors 1216A and 1216B execute the instructions 1214 to control communications through the RF circuitry 1204 and antenna structure 1210. For example, the one or more processors 1216A and 1216B may execute the instructions 1214 to generate or process baseband signals or waveforms that carry information using wireless channels, and / or manage the radio functions of RF circuitry 1204 and antenna structure 1210, such as signal modulation, encoding, radio frequency shifting, in addition or as an alternative to the user plane or control plane functions as described with respect to the baseband processor circuitry (BB) 1022A of FIG. 10 and the baseband processor circuitry (BB) 1116A of FIG. 11. In doing so, the apparatus 1200 enables communication, e.g., wireless cellular communication, over a 3GPP compatible network.
[0127] Additionally, in some implementations, the apparatus 1200 may include wireless hardware connectivity interface (s) to send / receive data to / from Near Field Communication (NFC) components, components (e.g., Low Energy) , components, and other communication components, and a power management interface (e.g., an interface to send / receive power) . In such implementations, the instructions 1214 may include instructions that, when executed by one or more of the processors 1216A and 1216B, cause these processors to perform Wi-Fi communications on an 802.11 network, and / or perform Bluetooth communications.
[0128] In some implementations, one or more of the processor 1216A and the processor 1216B can be a 3G baseband processor, a 4G baseband processor, a 5G baseband processor, or other suitable baseband processor. In some implementations, one or more of the processors 1216A and 1216B may be configured as an FPGA (Field Programmable Gate Array) , and / or may have dedicated hardware components, which may include an ASIC (Application Specific Integrated Circuit) .
[0129] Examples
[0130] Example 1: A method for wireless communication, the method comprising: receiving a Layer 1 Channel State Information Reference Signal (CSI-RS) measurement timing configuration (L1-CMTC) associated with one or more CSI-RS resources and a particular Bandwidth Part (BWP) ; and measuring the one or more CSI-RS resources from one or more neighboring cells based at least on the L1-CMTC.
[0131] Example 2: The method of Examples 1 or 2, wherein the receiving comprises receiving the L1-CMTC in a Radio Resource Control (RRC) signaling message from a base station.
[0132] Example 3: The method of any one of Examples 1-3, wherein the measuring comprises measuring the one or more CSI-RS resources from the one or more neighboring cells during a time window specified by the L1-CMTC in the particular BWP.
[0133] Example 4: The method of Example 1, wherein the L1-CMTC comprises one or more of a frequency configuration of the L1-CMTC, a time configuration of the L1-CMTC, or one or more identifiers (IDs) of the one or more CSI-RS resources.
[0134] Example 5: The method of Example 4, wherein the frequency configuration comprises one or more of a center frequency and a bandwidth of the L1-CMTC, a lower boundary of the L1-CMTC in a frequency domain and the bandwidth of the L1-CMTC, or the lower boundary of the L1-CMTC and an upper boundary of the L1-CMTC in the frequency domain.
[0135] Example 6: The method of Example 4, wherein the time configuration comprises one or more of a time offset from a first slot in a first System Frame Number (SFN) , a periodicity of the L1-CMTC, or a duration of the L1-CMTC.
[0136] Example 7: The method of Example 4, wherein the L1-CMTC further comprises a numerology and a Cyclic Prefix (CP) type of each CSI-RS resource configured in the L1-CMTC.
[0137] Example 8: The method of Example 7, wherein a plurality of CSI-RS resources configured in the L1-CMTC comprise the same numerology and the same CP type.
[0138] Example 9: The method of Example 8, further comprising: determining that one or more received time differences (RTDs) among the plurality of CSI-RS resources are less than or equal to a CP duration of the shortest CSI-RS symbol on the same frequency carrier; and in response to the determination, measuring the plurality of CSI-RS resources simultaneously within the L1-CMTC based on a number of the plurality of CSI-RS resources being no more than a known number.
[0139] Example 10: The method of Example 8, further comprising: determining that at least one received time difference (RTD) among the plurality of CSI-RS resources is greater than a CP duration of the shortest CSI-RS symbol on the same frequency carrier; and in response to the determination, measuring a subset of the plurality of CSI-RS resources within the L1-CMTC simultaneously using downlink timing of a serving cell, wherein the RTD among the subset of CSI-RS resources is greater than the CP duration of the shortest CSI-RS symbol on the same frequency carrier.
[0140] Example 11: The method of Example 8, further comprising: determining that a received time difference (RTD) among the plurality of CSI-RS resources is greater than a CP duration; and in response to the determination, measuring a subset of the plurality of CSI-RS resources within the L1-CMTC simultaneously using respective timing of the subset of CSI-RS resources, wherein the RTD among the subset of CSI-RS resources is greater than the CP duration.
[0141] Example 12: The method of Example 4, wherein at least one of the one or more CSI-RS resources configured in the L1-CMTC comprises a different numerology or a different CP type.
[0142] Example 13: The method of Example 12, further comprising: measuring, by a baseline UE, a subset of CSI-RS resources simultaneously within the L1-CMTC, wherein the subset of CSI-RS resources comprises the same numerology and the same CP type.
[0143] Example 14: The method of Example 12, further comprising: measuring, by an advanced UE comprising multiple Fast Fourier Transform (FFT) engines, all the CSI-RS resources simultaneously within the L1-CMTC.
[0144] Example 15: The method of Example 14, wherein a number of the FFT engines is equal to a number of numerologies.
[0145] Example 16: The method of any one of Examples 1-15, wherein the L1-CMTC is associated with a plurality of CSI-RS resources, the method further comprising: measuring, by a UE comprising multiple receivers operating on a frequency range 2 (FR2) , a subset of the plurality of CSI-RS resources within the L1-CMTC, wherein the subset of CSI-RS resources are received from different transmit (Tx) beams from a base station.
[0146] Example 17: The method of Example 16, wherein a number of the subset of CSI-RS resources is at least two.
[0147] Example 18: The method of any one of Examples 1-17, further comprising: performing BWP switching to a new BWP different from the particular BWP; and measuring the one or more CSI-RS resources during a time window of a new L1-CMTC corresponding to the new BWP.
[0148] Example 19: The method of Example 18, wherein the new L1-CMTC comprises a BWP identifier (ID) identifying the new BWP.
[0149] Example 20: The method of any one of Examples 1-19, further comprising: receiving a new L1-CMTC associated with the one or more CSI-RS resources and the particular BWP; and measuring the one or more CSI-RS resources during a time window of the L1-CMTC and a new time window of the new L1-CMTC in the particular BWP.
[0150] Example 21: The method of Example 20, wherein a center frequency of the L1-CMTC is the same as a center frequency of the new L1-CMTC.
[0151] Example 22: The method of Example 20, wherein a center frequency of the L1-CMTC is different from a center frequency of the new L1-CMTC.
[0152] Example 23: An apparatus comprising: one or more processors; and a memory storing instructions that, when executed, are configured to cause the one or more processors to perform operations of any one of method Examples 1-22.
[0153] Example 24: One or more processors comprising circuitry to execute one or more instructions that, when executed, cause the one or more processors to perform operations of any one of method Examples 1-22.
[0154] Example 25: One or more non-transitory computer-readable media storing instructions that, when executed, cause one or more processors to perform operations of any one of method Examples 1-22.
[0155] Various components may be described as performing a task or tasks, for convenience in the description. Such descriptions should be interpreted as including the phrase “configured to. ” Reciting a component that is configured to perform one or more tasks is expressly intended not to invoke 35 USC § 112 (f) interpretation for that component.
[0156] For one or more implementations, at least one of the components set forth in one or more of the preceding figures may be configured to perform one or more operations, techniques, processes, or methods as set forth in the example section below. For example, the baseband circuitry as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth below. For another example, circuitry associated with a UE, base station, network element, etc. as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth below in the example section.
[0157] Any of the above-described examples may be combined with any other example (or combination of examples) , unless explicitly stated otherwise. The foregoing description of one or more implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of implementations to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various implementations.
[0158] Although the implementations above have been described in considerable detail, numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated. It is intended that the following claims be interpreted to embrace all such variations and modifications.
[0159] 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.
Claims
1.A method for wireless communication, the method comprising:receiving a Layer 1 Channel State Information Reference Signal (CSI-RS) measurement timing configuration (L1-CMTC) associated with one or more CSI-RS resources and a particular Bandwidth Part (BWP) ; andmeasuring the one or more CSI-RS resources from one or more neighboring cells based at least on the L1-CMTC.2.The method of claim 1, wherein the receiving comprises receiving the L1-CMTC in a Radio Resource Control (RRC) signaling message from a base station.3.The method of claims 1 or 2, wherein the measuring comprises measuring the one or more CSI-RS resources from the one or more neighboring cells during a time window specified by the L1-CMTC in the particular BWP.4.The method of any one of claims 1-3, wherein the L1-CMTC comprises one or more of a frequency configuration of the L1-CMTC,a time configuration of the L1-CMTC, orone or more identifiers (IDs) of the one or more CSI-RS resources.5.The method of claim 4, wherein the frequency configuration comprises one or more of a center frequency and a bandwidth of the L1-CMTC,a lower boundary of the L1-CMTC in a frequency domain and the bandwidth of the L1-CMTC, orthe lower boundary of the L1-CMTC and an upper boundary of the L1-CMTC in the frequency domain.6.The method of claim 4, wherein the time configuration comprises one or more of a time offset from a first slot in a first System Frame Number (SFN) ,a periodicity of the L1-CMTC, ora duration of the L1-CMTC.7.The method of claim 4, wherein the L1-CMTC further comprises a numerology and a Cyclic Prefix (CP) type of each CSI-RS resource configured in the L1-CMTC.8.The method of claim 7, wherein a plurality of CSI-RS resources configured in the L1-CMTC comprise the same numerology and the same CP type.9.The method of claim 8, further comprising:determining that one or more received time differences (RTDs) among the plurality of CSI-RS resources are less than or equal to a CP duration of the shortest CSI-RS symbol on the same frequency carrier; andin response to the determination, measuring the plurality of CSI-RS resources simultaneously within the L1-CMTC based on a number of the plurality of CSI-RS resources being no more than a known number.10.The method of claim 8, further comprising:determining that at least one received time difference (RTD) among the plurality of CSI-RS resources is greater than a CP duration of the shortest CSI-RS symbol on the same frequency carrier; andin response to the determination, measuring a subset of the plurality of CSI-RS resources within the L1-CMTC simultaneously using downlink timing of a serving cell, wherein the RTD among the subset of CSI-RS resources is greater than the CP duration of the shortest CSI-RS symbol on the same frequency carrier.11.The method of claim 8, further comprising:determining that a received time difference (RTD) among the plurality of CSI-RS resources is greater than a CP duration; andin response to the determination, measuring a subset of the plurality of CSI-RS resources within the L1-CMTC simultaneously using respective timing of the subset of CSI-RS resources, wherein the RTD among the subset of CSI-RS resources is greater than the CP duration.12.The method of claim 4, wherein at least one of the one or more CSI-RS resources configured in the L1-CMTC comprises a different numerology or a different CP type.13.The method of claim 12, further comprising:measuring, by a baseline UE, a subset of CSI-RS resources simultaneously within the L1-CMTC, wherein the subset of CSI-RS resources comprises the same numerology and the same CP type.14.The method of claim 12, further comprising:measuring, by an advanced UE comprising multiple Fast Fourier Transform (FFT) engines, all the CSI-RS resources simultaneously within the L1-CMTC.15.The method of claim 14, wherein a number of the FFT engines is equal to a number of numerologies.16.The method of any one of claims 1-15, wherein the L1-CMTC is associated with a plurality of CSI-RS resources, the method further comprising:measuring, by a UE comprising multiple receivers operating on a frequency range 2 (FR2) , a subset of the plurality of CSI-RS resources within the L1-CMTC, wherein the subset of CSI-RS resources are received from different transmit (Tx) beams from a base station.17.The method of claim 16, wherein a number of the subset of CSI-RS resources is at least two.18.An apparatus comprising:one or more processors; anda memory storing instructions that, when executed, are configured to cause the one or more processors to perform operations of any one of method claims 1-17.19.One or more processors comprising circuitry to execute one or more instructions that, when executed, cause the one or more processors to perform operations of any one of method claims 1-17.20.One or more non-transitory computer-readable media storing instructions that, when executed, cause one or more processors to perform operations of any one of method claims 1-17.