Systems, methods, and devices for CSI reporting in a mobility procedure
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-08-13
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Figure CN2025075952_13082026_PF_FP_ABST
Abstract
Description
SYSTEMS, METHODS, AND DEVICES FOR CSI REPORTING IN A MOBILITY PROCEDUREFIELD
[0001] This disclosure relates to wireless communication networks and mobile device capabilities.BACKGROUND
[0002] Wireless communication networks and wireless communication services are becoming increasingly dynamic, complex, and ubiquitous. For example, some wireless communication networks can be developed to implement fifth generation (5G) or new radio (NR) technology, sixth generation (6G) technology, and so on. Such technology can include solutions for reducing latency associated with performing a mobility procedure for a user equipment (UE) . That is, a UE can be configured to switch between cells of a network, such as from a source cell to a target cell (e.g., a candidate cell) , based on performing a mobility procedure (e.g., facilitated by one or more network devices of the network) .BRIEF DESCRIPTION OF THE DRAWINGS
[0003] The present disclosure will be readily understood and enabled by the detailed description and accompanying figures of the drawings. Like reference numerals can designate like features and structural elements. Figures and corresponding descriptions are provided as non-limiting examples of aspects, implementations, etc., of the present disclosure, and references to "an" or “one” aspect, implementation, etc., may not necessarily refer to the same aspect, implementation, etc., and can mean at least one, one or more, etc.
[0004] Fig. 1 is a diagram of an example overview according to one or more implementations described herein.
[0005] Fig. 2 is a diagram of example environment according to one or more implementation described herein.
[0006] Fig. 3 is a diagram of an example process of a traditional mobility procedure according to one or more implementations described herein.
[0007] Fig. 4 is a diagram of an example process for determining and reporting CSI before or during a mobility procedure according to one or more implementations described herein.
[0008] Fig. 5 is a diagram of an example of a Channel State Information (CSI) Reference Signal (RS) (CSI-RS) resource set allocation scheme for candidate cells of a network according to one or more implementations described herein.
[0009] Fig. 6 is a diagram of an example aperiodic CSI report configuration for candidate cells according to one or more implementations described herein.
[0010] Figs. 7A and 7B are diagrams of examples of Medium Access Control (MAC) Control Elements (MAC-CEs) to trigger performing CSI measurement according to one or more implementations described herein.
[0011] Fig. 8 is a diagram of an example of a modified MAC-CE configured to trigger performing CSI measurement according to one or more implementations described herein.
[0012] Fig. 9 is a diagram of an example of a modified MAC-CE configured to trigger performing CSI measurement according to one or more implementations described herein.
[0013] Figs. 10A and 10B are diagrams of examples of Downlink Control Information (DCI) formats configured to trigger performing CSI measurement according to one or more implementations described herein.
[0014] Fig. 11 is a diagram of an example resource element (RE) mapping for transmitting a CSI report according to one or more implementations described herein.
[0015] Fig. 12 is a diagram of an example of components of a device configured to perform CSI measurement before or during a mobility procedure according to one or more implementations described herein.
[0016] Fig. 13 is a diagram of example interfaces of baseband circuitry configured to perform CSI measurement before or during a mobility procedure according to one or more implementations described herein.
[0017] Fig. 14 is a block diagram illustrating components, according to one or more implementations described herein, able to read instructions from a machine-readable or computer-readable medium (e.g., a non-transitory machine-readable storage medium) and perform any one or more of the methodologies directed to performing CSI measurement before or during a mobility procedure, as discussed herein.
[0018] Fig. 15 is a diagram of an example process for CSI reporting in a mobility procedure according to one or more implementations described herein.
[0019] Fig. 16 is a diagram of an example process for CSI reporting in a mobility procedure according to one or more implementations described herein.DETAILED DESCRIPTION
[0020] The following detailed description refers to the accompanying drawings. Like reference numbers in different drawings can identify the same or similar features, elements, operations, etc. Additionally, the present disclosure is not limited to the following description as other implementations can be utilized, and structural or logical changes made, without departing from the scope of the present disclosure.
[0021] Wireless communication networks can include user equipment (UE) capable of communicating with base stations and / or other network devices. UEs and base stations can implement various techniques and communications standards for enabling UEs and base stations to discover one another, establish and maintain connectivity, and exchange information in an ongoing manner. Some applications (e.g., mobile services) can require low latency and high reliability performance. Existing standards are designed to address these requirements but can be improved to enhance mobility robustness performance for these applications.
[0022] Networks can include a quantity of cells which can be associated with coverage areas (e.g., geographical areas) supporting connecting UEs with the network. In some examples, base stations (e.g., Next Generation Node Bs (gNBs) ) can be associated with one or more cells of a network. For example, a network can support a quantity of base stations, where each base station is associated with one or more cells of the network. In some examples, base stations can support communicating with UEs (e.g., to facilitate operations and / or signaling of the network) within coverage areas associated with the one or more cells.
[0023] In some examples, a mobility procedure can be performed for a UE switching between cells of the network. That is, a UE can be connected with a base station via a source cell based on the UE being within a coverage area associated with the source cell. The UE can move into a coverage area associated with a different cell (e.g., a target cell) , which can be associated with the same base station or a different base station of the network. The network (e.g., the base station and / or the different base station) , in collaboration with the UE, can perform a mobility procedure to switch the UE from the source cell to the target cell, otherwise referred to as a handover procedure. The mobility procedure can include signaling and operations, performed by both the UE and the base station, to facilitate establishing a connection with the target cell.
[0024] Some mobility procedures can include Layer 3 signaling (e.g., Radio Resource Control (RRC) messaging) , which can be associated with relatively high signaling overhead and latency for performing cell switching (e.g., due to downlink (DL) synchronization, uplink (UL) synchronization, and / or a Random Access Channel (RACH) procedure) . For example, performing handover of the UE from the source cell to the target cell can result in a relatively high interruption time in which the UE may not transmit or receive user data.
[0025] To reduce signaling overhead and interruption time, improved mobility procedures can use a mix of RRC, Medium Access Control (MAC) , and physical layer (e.g., Layer 1 (L1) ) signaling and messages. For example, an L1-L2 triggered mobility (LTM) procedure can perform some operations (e.g., DL synchronization and / or UL synchronization) without breaking a connection between the UE and the source cell, which can cause the interruption time to be delayed until a later operation of the cell switching in which reception of a cell switch command triggers reconfiguration of the UE.
[0026] Link adaptation can be an important operation for improving spectral efficiency. Link adaptation can include the UE evaluating a connection with a cell to determine link quality parameters associated with the quality or strength of the connection. In some cases, the UE can generate a link quality report (e.g., a Channel State Information (CSI) report) for a cell based on evaluating the connection with the cell and transmit the link quality report to the network (e.g., a base station of the network) . Link quality reporting (e.g., receiving the link quality report at the network) can enable the network to perform link adaptation, such as adjusting the Modulation Coding Scheme (MCS) for Physical Downlink Shared Channel (PDSCH) signaling. Additionally, link quality reporting can enable the network to adjust an aggregation level for Physical Downlink Control Channel (PDCCH) signaling.
[0027] In some examples, implementing the LTM can cause link adaptation to be delayed until after completion of the handover. For example, the UE can estimate link quality with the target cell of the handover, however the UE may not begin estimating link quality with the target cell until after the handover has been executed. In some such examples, the UE may not transmit the link quality report to the network until after the handover has been executed, resulting in a delay before the link quality report is received at the network. Delaying the link quality reporting can delay when the network can perform link adaptation. Thus, reducing a delay for performing link adaptation regarding the mobility procedure can be desirable.
[0028] Objectives of such techniques can include performing one or more operations associated with facilitating link quality reporting before or during the LTM. For example, a UE can be configured to determine CSI on candidate cells of the network before or during the LTM cell switching, based on receiving CSI-Reference Signals (CSI-RSs) . The UE can be configured to begin estimating link quality prior to the completion of the LTM (e.g., during the LTM) . This can enable the UE to transmit the link quality report to the network at a relatively earlier time than the scenario in which the UE does not begin estimating link quality until after the completion of the LTM. In some examples, performing link quality reporting earlier can reduce the delay for when the network can perform link adaptation. In some such examples, implementing the techniques described herein can decrease latency for performing link adaptation regarding the mobility procedure (e.g., the LTM) .
[0029] In accordance with examples as described herein, an improved LTM can include one or more new operations and / or adjusted operations to facilitate link quality reporting before or during completion of the LTM cell switching. For example, a quantity of CSI-RS resource sets associated with one or more candidate cells can be configured. The CSI-RS resource sets can be used to facilitate performing measurements (e.g., link quality measurements of the one or more candidate cells) by the UE, such as Channel State Measurement (CSM) and Interference Measurement (IM) . Additionally, the UE can be configured to perform measurements using the CSI-RS resource sets and generate CSI reports for the one or more candidate cells. For example, the UE can be configured with one or more aperiodic CSI reports for a candidate cell (e.g., each candidate cell) , which can be identified by a CSI report ID or associated with a CSI-RS resource set of the candidate cell.
[0030] Likewise, the UE can be configured to activate performing measurements using the CSI-RS resource sets before or during the LTM cell switching. For example, the UE can be instructed to perform the measurements based on receiving a new message or modified message during the LTM. In response to receiving the instructions, the UE can receive the CSI-RS resource sets and perform measurements using the CSI-RS resource sets. After performing the measurements, the UE can generate and transmit CSI reports based on the configuration of the UE. In some examples, the UE can transmit the CSI reports before, during, or shortly after the completion of the LTM cell switching. In some examples, the UE can leverage existing messages for transmitting the CSI reports.
[0031] The network can use the CSI reports for performing link adaptation of the target cell. For example, the network can use the CSI reports to adjust the MCS for PDSCH signaling or an aggregation level for PDCCH from the target cell, based on the UE being switched to the target cell by the LTM. Implementing the CSI reporting at a relatively earlier time compared to other mobility procedures can reduce latency associated with delays for performing link adaptation regarding the mobility procedure. In some examples, reducing the latency can impact network latency, such that implementing a similarly improved LTM for each UE of the network can be associated with overall latency improvement of the network. This can improve network efficiency, among other advantages.
[0032] Fig. 1 is a diagram of an example overview 100 for according to one or more implementations described herein. As shown, overview 100 includes UE 110 and base stations 120 (e.g., base station 120-1, base station 120-2) . Base stations 120 can include one or more cells 130. For example, base station 120-1 can include cell 130-1, and base station 120-2 can include cell 130-2 and cell 130-3.
[0033] Overview 100 includes an example of performing CSI measurements and reporting at UE 110 before or during a mobility procedure, including cell switching from cell 130-1 to cell 130-2 or cell 130-3. That is, prior to performing the mobility procedure, UE 110 can be connected with base station 120-1, such that cell 130-1 is a source cell of UE 110, and cells 130-2 and 130-3 are candidate cells (e.g., target cells) . In some examples, prior to the mobility procedure, UE 110 can be in a geographical area defined by more than one cell 130, such as cell 130-1 and cell 130-2. In other examples, prior to the mobility procedure, UE 110 can be in a geographical area defined by a single cell 130, such as cell 130-1. In such examples, UE 110 can move at least partially between the geographical area defined by cell 130-1 and a geographical area defined by another cell, such as cell 130-2 and / or cell 130-3, thereby triggering the mobility procedure.
[0034] To perform CSI measuring and reporting associated with the mobility procedure, base station 120-1 and 120-2 can configure one or more CSI-RS resource sets for each candidate cell 130, including cell 130-2 and cell 130-3 (at 1.1) . The CSI-RS resource sets can be periodic CSI-RS (P-CSI-RS) , semi-persistent CSI-RS (SP-CSI-RS) , and / or aperiodic CSI-RS (AP-CSI-RS) resource sets. P-CSI-RS resource sets can be transmitted at a consistent interval or periodicity. SP-CSI-RS resource sets can be transmitted at consistent intervals which can be temporarily suspended. AP-CSI-RS resource sets can be transmitted without a pre-defined schedule and can be sent after a notification to the receiving entity.
[0035] UE 110 can be configured by the network to generate and transmit CSI reports (at 1.2) . For example, UE 110 can be configured with one or more CSI reports for a candidate cell, such as cell 130-2 or cell 130-3. In some implementations, the CSI reports can be identified by respective CSI reports IDs or associated with a CSI-RS (e.g., P-CSI-RS, SP-CSI-RS, AP-CSI-RS) resource set of a candidate cell (e.g., each candidate cell) .
[0036] UE 110 can be instructed to perform CSI measuring and reporting (at 1.3) . For example, UE 110 can be instructed by base station 120-1 to activate measurement on one or more CSI-RS resource sets. For example, the instructions can be transmitted as a new MAC-Control Element (MAC-CE) or as an updated MAC-CE (e.g., updated from an existing MAC-CE transmitted as part of the mobility procedure) . Alternatively, the instructions can be transmitted as a new Downlink Control Information (DCI) format or as an updated DCI format (e.g., updated from an existing DCI format transmitted as part of the mobility procedure) .
[0037] The UE 110 can be configured to perform CSI measuring and reporting based on receiving the instructions to activate measurement (at 1.5) . Likewise, the candidate cells can be configured to transmit the CSI-RS resource sets to UE 110 for measurement (at 1.4) . For example, base station 120-2 can transmit the CSI-RS resource sets associated with cell 130-2 and cell 130-3 to UE 110 to be measured.
[0038] After performing measurements on the CSI-RS resource sets, UE 110 can be configured to transmit CSI reports to one or more target cells of the network (at 1.6) . In some implementations, UE 110 can transmit CSI reports to the network as part of an existing message of the mobility procedure, such as during a RACH procedure included within the mobility procedure. In some implementations, when UE 110 received the instructions to initiate measuring can alter a time at which the CSI reports are transmitted to the network, and which messages of the mobility procedure to leverage for CSI reporting.
[0039] Accordingly, implementing the CSI measuring and reporting before or during the mobility procedure can reduce latency associated with the network performing link adaptation. That is, transmitting the CSI reports earlier can enable the delay for performing link adaptation by the network to be reduced, which can be associated with improved efficiency for the network, among other advantages.
[0040] Fig. 2 illustrates an example environment 200 in which one or more of the techniques described herein can be implemented. Example environment 200 can include UEs 210-1, 210-2, etc. (referred to collectively as “UEs 210” and individually as “UE 210” ) , a radio access network (RAN) 220, a core network (CN) 230, application servers 240, external networks 250. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0041] The systems and devices of example environment 200 can operate in accordance with one or more communication standards, such as 3rd generation (3G) , 4th generation (4G) (e.g., long-term evolution (LTE) ) , and / or 5th generation (5G) (e.g., new radio (NR) ) communication standards of the 3rd generation partnership project (3GPP) . Additionally, or alternatively, one or more of the systems and devices of example environment 200 can operate in accordance with other communication standards and protocols discussed herein, including future versions or generations of 3GPP standards (e.g., sixth generation (6G) standards, seventh generation (7G) standards, etc. ) , institute of electrical and electronics engineers (IEEE) standards, and more.
[0042] As shown, UEs 210 can include smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more wireless communication networks) . Additionally, or alternatively, UEs 210 can include other types of mobile or non-mobile computing devices capable of wireless communications, such as personal data assistants (PDAs) , pagers, laptop computers, desktop computers, wireless handsets, etc. In some implementations, UEs 210 can include Internet of Things (IoT) devices (or IoT UEs) that can implement narrowband (NB) communications and that can comprise, for example, a network access layer designed for low-power IoT applications utilizing short-lived UE connections.
[0043] Additionally, or alternatively, an IoT UE can utilize one or more types of technologies, such as machine-to-machine (M2M) communications or machine-type communications (MTC) (e.g., to exchanging data with an MTC server or other device via a public land mobile network (PLMN) ) , proximity-based service (ProSe) or device-to-device (D2D) communications, sensor networks, IoT networks, and more. Depending on the scenario, an M2M or MTC exchange of data can be a machine-initiated exchange, and an IoT network can include interconnecting IoT UEs (which can include uniquely identifiable embedded computing devices within an Internet infrastructure) with short-lived connections. In some scenarios, IoT UEs can execute background applications (e.g., keep-alive messages, status updates, etc. ) to facilitate the connections of the IoT network.
[0044] UEs 210 can communicate and establish a connection with one or more other UEs 210 via one or more wireless channels 212, each of which can comprise a physical communications interface / layer. The connection can include an M2M connection, MTC connection, D2D connection, SL connection, etc. The connection can involve a PC5 interface. In some implementations, UEs 210 can be configured to discover one another, negotiate wireless resources between one another, and establish connections between one another, without intervention or communications involving RAN node 222 or another type of network node. In some implementations, discovery, authentication, resource negotiation, registration, etc., can involve communications with RAN node 222 or another type of network node.
[0045] Various techniques for communication between and among UEs 210 in furtherance of offloading or computing operations are within the scope of the present disclosure. As described herein, in an example, UE 210 can communicate with RAN node 222 to request SL resources. RAN node 222 can respond to the request by providing UE 210 with a dynamic grant (DG) or configured grant (CG) regarding SL resources. The UE 210 can communicate with RAN node 222 using a licensed frequency band and communicate with the other UE 210 using an unlicensed or licensed frequency band. In another example, UEs 210 can communicate directly without involvement of RAN node 222, such as through resource pools, etc.
[0046] UEs 210 can communicate and establish a connection with RAN 220, which can involve one or more wireless channels 214-1 and 214-2, each of which can comprise a physical communications interface / layer. In some implementations, a UE can be configured with dual connectivity (DC) as a multi-radio access technology (multi-RAT) or multi-radio dual connectivity (MR-DC) , where a multiple receive and transmit (Rx / Tx) capable UE can use resources provided by different network nodes (e.g., 222-1 and 222-2) that can be connected via non-ideal backhaul (e.g., where one network node provides NR access and the other network node provides either E-UTRA for LTE or NR access for 5G) . A network node can be referred to herein as a base station 222. In such a scenario, one network node can operate as a master node (MN) and the other as the secondary node (SN) . The MN and SN can be connected via a network interface, and at least the MN can be connected to the CN 230. In some implementations, a base station (as described herein) can be an example of network node 222. In some scenarios, RAN 220 can coordinate with core network 230 via interfaces 224, 226, and / or 228.
[0047] As shown, UE 210 can also, or alternatively, connect to access point (AP) 216 via connection interface 218, which can include an air interface enabling UE 210 to communicatively couple with AP 216. AP 216 can comprise a wireless local area network (WLAN) , WLAN node, WLAN termination point, etc. The connection 216 can comprise a local wireless connection, such as a connection consistent with any IEEE 702.11 protocol, and AP 216 can comprise a wireless fidelity router or other access point device. While not explicitly depicted in Fig. 2, AP 216 can be connected to another network (e.g., the Internet) without connecting to RAN 220 or CN 230.
[0048] One or more of the techniques described herein include solutions for CSI measuring before or during a mobility procedure. That is, environment 200 can support UE 210 determining CSI using CSI-RS resource sets received from candidate cells of environment 200 prior to the completion of the mobility procedure. For example, candidate cells associated with RAN nodes 222-1 and 222-2 can be configured to transmit CSI-RS resource sets to UE 210, which UE 210 can use to determine CSI and generate CSI reports. UE 210 can perform CSI reporting prior to the completion of cell switching between a source cell of UE 210 and one of the candidate cells. To facilitate determining CSI and CSI reporting, environment 200 can implement new or existing messages between UE 210 and RAN node 222-1 and / or 222-2. Performing CSI measurement before or during the mobility procedure can reduce latency associated with performing link adaptation, which can reduce overall latency experienced by environment 200, among other advantages. These and many other features and examples are described herein.
[0049] RAN 220 can include one or more RAN nodes 222-1 and 222-2 (referred to collectively as RAN nodes 222, and individually as RAN node 222) that enable channels 214-1 and 214-2 to be established between UEs 210 and RAN 220. RAN nodes 222 can include network access points configured to provide radio baseband functions for data and / or voice connectivity between users and the network based on one or more of the communication technologies described herein (e.g., 3G, 4G, 5G, WiFi, etc. ) . As examples therefore, a RAN node can be an E-UTRAN Node B (e.g., an enhanced Node B, eNodeB, eNB, 4G base station, etc. ) , a next generation base station (e.g., a 5G base station, NR base station, next generation eNBs (gNB) , etc. ) . RAN nodes 222 can include a roadside unit (RSU) , a transmission reception point (TRxP or TRP) , and one or more other types of ground stations (e.g., terrestrial access points) . In some scenarios, RAN node 222 can be a dedicated physical device, such as a macrocell base station, and / or a low power (LP) base station for providing femtocells, picocells or the like having smaller coverage areas, smaller user capacity, or higher bandwidth compared to macrocells. A RAN node can generally be referred to herein as base station 222.
[0050] Some or all of RAN nodes 222, or portions thereof, can be implemented as one or more software entities running on server computers as part of a virtual network, which can be referred to as a centralized RAN (CRAN) and / or a virtual baseband unit pool (vBBUP) . In these implementations, the CRAN or vBBUP can implement a RAN function split, such as a packet data convergence protocol (PDCP) split wherein radio resource control (RRC) and PDCP layers can be operated by the CRAN / vBBUP and other Layer 1 (L1) protocol entities can be operated by individual RAN nodes 222; a media access control (MAC) / physical (PHY) layer split wherein RRC, PDCP, radio link control (RLC) , and MAC layers can be operated by the CRAN / vBBUP and the PHY layer can be operated by individual RAN nodes 222; or a “lower PHY” split wherein RRC, PDCP, RLC, MAC layers and upper portions of the PHY layer can be operated by the CRAN / vBBUP and lower portions of the PHY layer can be operated by individual RAN nodes 222. This virtualized framework can allow freed-up processor cores of RAN nodes 222 to perform or execute other virtualized applications.
[0051] In some implementations, an individual RAN node 222 can represent individual gNB-distributed units (DUs) connected to a gNB-control unit (CU) via individual F1 or other interfaces. In such implementations, the gNB-DUs can include one or more remote radio heads or radio frequency (RF) front end modules (RFEMs) , and the gNB-CU can be operated by a server (not shown) located in RAN 220 or by a server pool (e.g., a group of servers configured to share resources) in a similar manner as the CRAN / vBBUP. Additionally, or alternatively, one or more of RAN nodes 222 can be next generation eNBs (i.e., gNBs) that can provide evolved universal terrestrial radio access (E-UTRA) user plane and control plane protocol terminations toward UEs 210, and that can be connected to a 5G core network (5GC) 230 via an NG interface.
[0052] Any of the RAN nodes 222 can terminate an air interface protocol and can be the first point of contact for UEs 210. In some implementations, any of the RAN nodes 222 can fulfill various logical functions for the RAN 220 including, but not limited to, radio network controller (RNC) functions such as radio bearer management, uplink and downlink dynamic radio resource management and data packet scheduling, and mobility management. UEs 210 can be configured to communicate using orthogonal frequency-division multiplexing (OFDM) communication signals with each other or with any of the RAN nodes 222 over a multicarrier communication channel in accordance with various communication techniques, such as, but not limited to, an OFDMA communication technique (e.g., for downlink communications) or a single carrier frequency-division multiple access (SC-FDMA) communication technique (e.g., for uplink and ProSe or sidelink (SL) communications) , although the scope of such implementations may not be limited in this regard. The OFDM signals can comprise a plurality of orthogonal subcarriers.
[0053] The PDSCH can carry user data and higher layer signaling to UEs 210. The physical downlink control channel (PDCCH) can carry information about the transport format and resource allocations related to the PDSCH channel, among other things. The PDCCH can also inform UEs 210 about the transport format, resource allocation, and hybrid automatic repeat request (HARQ) information related to the uplink shared channel. Typically, downlink scheduling (e.g., assigning control and shared channel resource blocks to UE 210 within a cell) can be performed at any of the RAN nodes 222 based on channel quality information feedback from any of UEs 210. The downlink resource assignment information can be sent on the PDCCH used for (e.g., assigned to) each of UEs 210.
[0054] RAN nodes 222 can be configured to communicate with one another via interface 223. In implementations where the system is an LTE system, interface 223 can be an X2 interface. In NR systems, interface 223 can be an Xn interface. The X2 interface can be defined between two or more RAN nodes 222 (e.g., two or more eNBs / gNBs or a combination thereof) that connect to evolved packet core (EPC) or CN 230, or between two eNBs connecting to an EPC. As shown, RAN 220 can be connected (e.g., communicatively coupled) to CN 230. CN 230 can comprise a plurality of network elements 232, which are configured to offer various data and telecommunications services to customers / subscribers (e.g., users of UEs 210) who are connected to the CN 230 via the RAN 220. In some implementations, CN 230 can include an evolved packet core (EPC) , a 5G CN (5GC) , and / or one or more additional or alternative types of CNs.
[0055] As shown, CN 230, application servers 240, and external networks 250 can be connected to one another via interfaces 234, 236, and 238, which can include IP network interfaces. Application servers 240 can include one or more server devices or network elements (e.g., virtual network functions (VNFs) offering applications that use IP bearer resources with CN 230 (e.g., universal mobile telecommunications system packet services (UMTS PS) domain, LTE PS data services, etc. ) . Application servers 240 can also, or alternatively, be configured to support one or more communication services (e.g., voice over IP (VoIP sessions, push-to-talk (PTT) sessions, group communication sessions, social networking services, etc. ) for UEs 210 via the CN 230. Similarly, external networks 250 can include one or more of a variety of networks, including the Internet, thereby providing the mobile communication network and UEs 210 of the network access to a variety of additional services, information, interconnectivity, and other network features.
[0056] Fig. 3 is a diagram of an example process 300 of a traditional mobility procedure according to one or more implementations described herein. As shown, process 300 can be performed by UE 210 and base station 222. Operations described as being performed by UE 210 can be performed, at least in part, by baseband circuitry of UE 210. Base station 222 can be implemented by base station 120 or another type of network entity (e.g., a gNB, a TRP) . In some scenarios, base station 222 can be representative of the network facilitating operations of base station 222. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0057] Some or all of process 300 can be performed by one or more other systems or devices, including one or more of the devices of Fig. 1 or Fig. 2. Additionally, process 300 can include one or more fewer, additional, differently ordered, and / or arranged operations than those shown in Fig. 3. Some or all of the operations of process 300 can be performed independently, successively, simultaneously, etc., of one or more of the other operations of process 300. As such, the techniques described herein are not limited to the number, sequence, arrangement, timing, etc., of the operations or processes depicted in Fig. 3.
[0058] Process 300 illustrates high level operations and / or signaling associated with performing a traditional mobility procedure. For example, the operations and / or signaling shown in process 300 can be implemented in a L1-L2 triggered mobility procedure (LTM) . Process 300 is provided as a reference for a traditional mobility procedure, which can be referred to for describing other operations and / or signaling, such as those of process 400, as described with reference to FIG. 4.
[0059] The traditional mobility procedure can include multiple phases associated with supporting cell switching, where each phase can include one or more operations and / or signaling. For example, process 300 includes LTM preparation, early sync, LTM cell switch execution, and LTM cell switch completion, each of which can be implemented in the corresponding order.
[0060] As shown in process 300, UE 210 can begin the LTM preparation phase in an RRC connected mode (e.g., RRC_Connected) , in which UE 210 is in an active state and operable to communicate signaling with base station 222 (block 305) . While operating in RRC connected mode, UE 210 can transmit a measurement report (e.g., a MeasurementReport message) to base station 222 (e.g., based on base station 222 being associated with a source cell of UE 210) (block 310) . Based on receiving the measurement report, base station 222 can decide to configure LTM and initiate LTM candidate preparation (block 315) . Base station 222 can transmit an RRC reconfiguration message (e.g., RRCReconfiguration message) to UE 210 including the LTM candidate configurations (block 320) . In response to receiving the RRC reconfiguration message, UE 210 can store the LTM candidate configurations and transmit a completion message (e.g., RRCReconfigurationComplete message) to base station 222 (block 325) .
[0061] As shown in process 300, the LTM preparation phase is followed by the early sync phase. In the early sync phase, UE 210 can perform DL synchronization with one or more LTM candidate cells (block 330) . In some examples, UE 210 can activate and deactivate Transmission Configuration Indicator (TCI) states of the one or more LTM candidate cells, as triggered by base station 222. Also in the early sync phase, UE 210 can perform UL synchronization with the one or more LTM candidate cells by using UE-based timing advance (TA) measurement (e.g., if UE 210 is configured to perform TA measurement) , and / or by transmitting a preamble to the one or more LTM candidate cells (e.g., as triggered by base station 222) (block 335) . In some examples, if UE 210 is configured to perform TA measurement, UE 210 can acquire TA values of the one or more LTM candidate cells as requested by the network. This can be performed via Contention Free Random Access (CFRA) triggered by a PDCCH order from base station 222 (e.g., the source cell) . Then, UE 210 can send a preamble towards an indicated LTM candidate cell.
[0062] As shown in process 300, the early sync phase is followed by the LTM cell switch execution phase. In the LTM cell switch phase, UE 210 can perform L1 measurements on the one or more LTM candidate cells and transmit L1 measurement reports to base station 222 (block 340) . Then, base station 222 can decide to execute cell switching to a target cell (block 345) and transmit an LTM cell switch command (e.g., a MAC-CE) to trigger cell switching (block 350) . In some examples, the LTM cell switch command can include a target configuration ID indicating the target cell, beams indicating TCI states (e.g., DL and UL TCI states) , and a TA command for the target cell. Next, UE 210 can switch to the target cell and apply the candidate configuration indicated by the target configuration ID (block 355) . After switching to the target cell, UE 210 can perform a RACH procedure with the target cell (block 360) .
[0063] As shown in process 300, the LTM cell switch execution phase is followed by the LTM cell switch completion phase. In the LTM cell switch completion phase, UE 210 can send a message (e.g., RRCReconfigurationComplete message) to the target cell (block 365) . Process 300 illustrates an example of a mobility procedure which can be leveraged for determining CSI before or during the mobility procedure, as described herein. Determining CSI before or during the mobility procedure as shown in process 300 can reduce latency for performing link adaptation, which can improve latency and efficiency of the network, among other advantages.
[0064] Fig. 4 is a diagram of an example process 400 for determining and reporting CSI before or during a mobility procedure according to one or more implementations described herein. As shown, process 400 can be performed by UE 210 and base station 222. Operations described as being performed by UE 210 can be performed, at least in part, by baseband circuitry of UE 210. Base station 222 can be implemented by base station 120 or another type of network entity (e.g., a gNB, a TRP) . In some scenarios, base station 222 can be representative of the network facilitating operations of base station 222. Base station 222 can be associated with one or more cells 130 and can be representative of one or more other base stations not illustrated in process 400. For example, base station 222 can be associated with a source cell, and representative of other base stations associated with candidate cells. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0065] Some or all of process 400 can be performed by one or more other systems or devices, including one or more of the devices of Fig. 1 or Fig. 2. Additionally, process 400 can include one or more fewer, additional, differently ordered, and / or arranged operations than those shown in Fig. 4. Some or all of the operations of process 400 can be performed independently, successively, simultaneously, etc., of one or more of the other operations of process 400. As such, the techniques described herein are not limited to the number, sequence, arrangement, timing, etc., of the operations or processes depicted in Fig. 4.
[0066] Process 400 illustrates operations and / or signaling associated with determining CSI and reporting CSI measurements relative to a mobility procedure. That is, operations and / or signaling shown in process 400 can be implemented or interchanged with operations and / or signaling of a traditional mobility procedure, such as in the example shown in process 300. For example, operations and signaling described herein can be performed in an order that is relative to the traditional mobility procedure, and can be implemented at times associated with the multiple phases of process 300, including LTM preparation, early sync, LTM cell switch execution, and LTM cell switch completion.
[0067] As shown in process 400, a network (e.g., represented by base station 222) is operable to configure a quantity of CSI-RS resource sets (block 410) . For example, the network can configure a quantity of P-CSI-RS, SP-CSI-RS, and / or AP-CSI-RS resource sets associated with one or more candidate cells. In some examples, the quantity of CSI-RS resource sets can be configured in a field (e.g., LTM-CSI-ResourceConfig IE) for Channel State Management (CSM) and Interference Measurement (IM) . In some examples, the network can configure the quantity of CSI-RS resource sets such that each candidate cell is associated with one or more CSI-RS resource sets. In some examples, each candidate cell can configure its own one or more CSI-RS resource sets, and transmit an indication of the one or more CSI-RS resource sets to the network and / or base station 222 (e.g., based on base station 222 being associated with a source cell of UE 210) . In other examples, base station 222 can configure the one or more CSI-RS resource sets for each candidate cell. In some examples, configuring the CSI-RS resource sets can at least partially occur during LTM candidate preparation (block 315) , as described with reference to process 300.
[0068] In a first implementation, a single CSI-RS resource set can be associated with a single candidate cell. In some such implementations, a Quasi-Colocation (QCL) source of the single CSI-RS resource set (e.g., a P-CSI-RS resource set, an SP-CSI-RS resource set) can be dynamically updated using MAC-CE signaling or using an RRC signal. That is, each CSI-RS resource set can be configured for a respective candidate cell based on dynamically updated signaling.
[0069] In a second implementation, a quantity (e.g., greater than 1) of CSI-RS resource sets can be associated with a single candidate cell. In some such implementations, a QCL source of the quantity of CSI-RS resource sets (e.g., a P-CSI-RS resource set, an SP-CSI-RS resource set) can be configured by RRC signaling. That is, the quantity of CSI-RS resource sets can be configured for a respective candidate cell based on initial signaling. In some implementations, a QCL source of an AP-CSI-RS resource set can be configured by RRC signaling or determined based on a command (e.g., a triggering command) .
[0070] As shown in process 400, UE 210 can be configured for CSI reporting (block 420) . For example, UE 210 can be configured by the network (e.g., base station 222) with one or more aperiodic CSI reports for a respective candidate cell. In some such examples, each aperiodic CSI report can be identified by a CSI report ID. In some implementations, each aperiodic CSI report can be associated with a respective P-CSI-RS, SP-CSI-RS, or AP-CSI-RS resource set associated with a respective candidate cell. That is, UE 210 can be configured to support CSI reporting for one or more CSI-RS resource sets associated with each candidate cell.
[0071] In some examples, to tradeoff UE complexity and throughput performance, the CSI reporting can be configured to support reporting of CSI-RS resource indicator (CRI) , channel quality information (CQI) , precoding matrix indicator (PMI) , and rank indicator (RI) for a Type I codebook. That is, rather than CSI reporting including every reporting parameter, UE 210 can be configured to report on specific parameters to prevent a decrease in throughput performance. In some examples, configuring UE 210 for CSI reporting can at least partially occur during RRC reconfiguration (block 320 or block 325) , as described with reference to Fig. 3.
[0072] As shown in process 400, base station 222 can instruct UE 210 to perform CSI measurements (block 430) . That is, receiving the instructions to perform CSI measurements can activate UE 210 to perform measurements on a CSI-Channel Measurement Resource (CSI-CMR) or CSI-Interference Measurement Resource (CSI-IMR) resource set for a respective candidate cell. In some examples, the instructions can indicate UE 210 to perform measurements for one or more candidate cells. After being instructed to perform CSI measurements, UE 210 can monitor for CSI-RS resource sets from the candidate cells (block 450) . Then, UE 210 can perform CSI measurement using the received CSI-RS resource sets (block 460) .
[0073] In a first example, new signaling can be introduced to instruct UE 210 to perform CSI measurements. That is, a new MAC-CE (e.g., introduced for LTM) can be transmitted to UE 210 to instruct UE 210 to perform CSI measurement on one or more P-CSI-RS or SP-CSI-RS resource sets associated with one or more aperiodic CSI reports for one or more candidate cells. In some examples, the new MAC-CE can be identified by a MAC sub-header with a dedicated extended Logical Channel ID (eLCID) field. The new MAC-CE can be transmitted to UE 210 at a time prior to or partially occurring with DL synchronization (block 330) , as described with reference to process 300.
[0074] In a first implementation (e.g. of the first example) , the new MAC-CE can be configured to trigger determining CSI for a single candidate cell. The MAC-CE can be a fixed size and include a quantity of fields. For example, the MAC-CE can include a field allocated for activating or deactivating measurements on one or more P-CSI-RS or SP-CSI-RS resource sets and / or CSI-IMR resource sets. Likewise, the MAC-CE can include a field allocated for the identity of the candidate cell (e.g., the single candidate cell) . In some instances, the MAC-CE can include an aperiodic CSI report ID indicating UE 210 to start performing measurements on a P-CSI-RS resource set associated with the aperiodic report ID. The UE 210 can use the measurements to compute CSI for the candidate cell. In other instances, the MAC-CE can include a P-CSI-RS or SP-CSI-RS resource set ID indicating one or more P-CSI-RS and / or SP-CSI-RS resource sets for use in computing CSI for the candidate cell. In some such instance, an aperiodic CSI report can be configured to be associated with a P-CSI-RS and / or SP-CSI-RS resource set for the candidate cell.
[0075] In a second implementation (e.g., of the first example) , the new MAC-CE can be configured to trigger determining CSI for multiple candidate cells. In some instances, the MAC-CE can include a field indicating activation or deactivation of CSI measurements using P-CSI-RS and / or SP-CSI-RS resource sets associated with a candidate cell identified by the field. In some such instances, the MAC-CE can include an associated field used for triggering or refraining from triggering the CSI measurements. In other instances, the MAC-CE can include a field allocated for the aperiodic CSI report ID indicating UE 210 to start performing measurements on a P-CSI-RS resource set associated with the aperiodic report ID. Alternatively, the field can be allocated for the P-CSI-RS or SP-CSI-RS resource set ID, indicating one or more P-CSI-RS and / or SP-CSI-RS resource sets for computing CSI. That is, the field can indicate the aperiodic CSI report ID or the P-CSI-RS or SP-CSI-RS resource set ID associated with a candidate cell, along with an ordinal position of the candidate cell among the multiple candidate cells.
[0076] In a second example, existing signaling can be modified to instruct UE 210 to perform CSI measurements. For example, an existing MAC-CE can be modified to trigger UE 210 to perform CSI measurement. In a first implementation (e.g., of the second example) , an existing MAC-CE associated with TCI-state activation or deactivation can be modified to instruct UE 210 to perform CSI measurement on one or more P-CSI-RS or SP-CSI-RS resource sets associated with one or more aperiodic CSI reports for one or more candidate cells. The existing MAC-CE can be used during DL synchronization, such that modifying the MAC-CE to trigger UE 210 to perform CSI measurement can cause UE 210 to begin performing CSI measurement at a time partially occurring with DL synchronization (block 330) , as described with reference to process 300. In some instances, the existing MAC-CE can include a reserved field which can be modified (e.g., reallocated) to indicate the aperiodic CSI report ID or the P-CSI-RS or SP-CSI-RS resource set ID. In some such instances, implementing the existing MAC-CE can enable the network (e.g., base station 222) to instruct UE 210 to perform CSI measurements on a candidate cell when activating a TCI state for the candidate cell.
[0077] In a second implementation (e.g., of the second example) , an existing MAC-CE associated with triggering UE 210 to execute cell switching can be modified to instruct UE 210 to perform CSI measurements. For example, a cell switch command for causing UE 210 to execute cell switching can be transmitted as a MAC-CE, and the MAC-CE can be enhanced to trigger UE 210 to perform CSI measurement on a P-CSI-RS, SP-CSI-RS, or AP-CSI-RS resource set. In some instances, the MAC-CE can be modified such that a reserved field can be modified to indicate the aperiodic CSI report ID or the P-CSI-RS or SP-CSI-RS resource set ID. The existing MAC-CE can be used to initiate cell switching, such that modifying the MAC-CE to trigger UE 210 to perform CSI measurements can cause UE 210 to begin performing CSI measurement at a time partially occurring with executing cell switching (block 355) , as described with reference to process 300. In some instances, the MAC-CE can be modified to include a timing relation for performing CSI measurement relative to the cell switching or receiving the cell switching command (block 350) , as described with reference to process 300.
[0078] In a third example, new DCI signaling can be introduced to instruct UE 210 to perform CSI measurements. That is, a new DCI (e.g., a DCI format) can be transmitted to UE 210 to instruct UE 210 to perform CSI measurement on one or more candidate cells. In a first implementation (e.g., of the third example) , a group common DCI format can be configured to instruct multiple UEs 210 of the network to perform CSI measurement on different candidate cells. For example, the DCI can include a quantity of blocks, each with an index associated with a respective UE 210. In some instances, each block can include two fields, one of which allocated for the candidate cell ID, and another field allocated for the aperiodic CSI report ID or the P-CSI-RS or SP-CSI-RS resource set ID. In other instances, the aperiodic CSI report ID can be indexed across different candidate cells, such that one field can include the candidate cell ID, the aperiodic CSI report ID, or the P-CSI-RS or SP-CSI-RS resource set ID. In this implementation, the DCI can be transmitted to UE 210 at a time prior to, partially occurring with, or shortly after the UL synchronization (block 330) , as described with reference to process 300.
[0079] In a second implementation (e.g., of the third example) , an existing DCI can be modified to instruct UE 210 to perform CSI measurements. For example, an existing DCI otherwise associated with initiating a PDCCH order for a candidate cell can be modified such that a subset of reserved bits can be allocated to indicate the aperiodic CSI report ID or the P-CSI-RS or SP-CSI-RS resource set ID. In some such examples, the existing DCI can be associated with operations of the RACH procedure (block 360) as described with reference to process 300. That is, the DCI can be transmitted to UE 210 at a time partially occurring during the RACH procedure.
[0080] In a third implementation (e.g., of the third example) , an existing DCI can be modified to instruct UE 210 to perform CSI measurements. For example, reserved bits of the existing DCI can be repurposed to indicate a single block number field, which can leverage the aperiodic CSI report ID being indexed across candidate cells. In some such examples, the reserved bits can instead store either the candidate cell ID, the aperiodic CSI report ID, or the P-CSI-RS or SP-CSI-RS resource set ID. In some such examples, the existing DCI may not be associated with DL data scheduling.
[0081] In a fourth implementation (e.g., of the third example) , an existing DCI can be modified to instruct UE 210 to perform CSI measurements. For example, a new field can be added to the DCI, which can be allocated for the single block number field described herein. The existing DCI can be transmitted to UE 210 at a time partially occurring during the RACH procedure (block 360) , as described with reference to process 300.
[0082] As shown in process 400, base station 222 can transmit the cell switch command to UE 210 (block 440) . The cell switch command can indicate UE 210 to execute cell switching from the source cell to a target cell of the candidate cells. In some examples, the MAC-CE associated with the cell switch command is modified to indicate UE 210 to activate CSI measurement, as described herein. Thus, the cell switch command can indicate UE 210 to execute cell switching and begin performing CSI measurement for the candidate cells. In some such examples, the UE 210 can be configured to execute cell switching at least partially concurrently with performing CSI measurement.
[0083] As shown in process 400, one or more CSI-RS resource sets can be transmitted to UE 210 (block 450) . That is, the candidate cells can transmit one or more CSI-RS resource sets periodically, semi-persistently, or aperiodically for UE 210 to receive. UE 210 can be configured to receive the CSI-RS resource sets based on receiving the instructions (e.g., or the modified cell switch command) to perform CSI measurement. That is, if the cell switch command is modified to include instructions to activate CSI measurement, receiving the cell switch command can cause UE 210 to monitor for the CSI-RS resource sets. In some examples, receiving the instructions to perform CSI measurement can trigger UE 210 to monitor for CSI-RS resource sets broadcast to UE 210 (e.g., and other UEs 210) from the candidate cells.
[0084] Process 400, UE 210 can perform CSI measurement (block 460) . That is, UE 210 can perform CSI measurement for the one or more candidate cells based on the CSI-RS resource sets received at UE 210. In some examples, performing CSI measurement can include determining CSI using the CSI-RS resource sets and generating one or more CSI reports including parameters associated with CSI. In some implementations, performing CSI measurement can occur at a time which at least partially overlaps with performing the operations and / or signaling as described with reference to process 300. In some examples, performing CSI measurement can occur out of order from the operations and / or signaling shown in process 400. For example, performing CSI measurement can occur prior to receiving the cell switch command.
[0085] Process 400, UE 210 can perform a RACH procedure with the target cell (block 470) . The RACH procedure can be a Contention-Free RACH (CFRA) procedure, or a Contention-Based RACH (CBRA) procedure. In some examples, performing the RACH procedure can include messaging which is modified to include the instructions to perform CSI measurement. Thus, performing CSI measurement can occur at a time at least partially overlapping with performing the RACH procedure. In some examples, transmitting CSI reporting can occur at a time at least partially overlapping with performing the RACH procedure. For example, CSI reporting can be transmitted via messaging of the RACH procedure which has been modified to indicate the CSI reporting.
[0086] Process 400, UE 210 can perform CSI reporting to the network (block 480) . That is, UE 210 can transmit one or more CSI reports to the network indicating CSI based on performing CSI measurement. In some examples, UE 210 can transmit the one or more CSI reports directly to the target cell (e.g., or target cells) . In a first example, a CFRA procedure or a CBRA procedure (e.g., the RACH procedure at block 470, a different RACH procedure) can be triggered by the cell switch command. The CFRA or the CBRA procedure can include at least a preamble transmission or random access (RA) request (e.g., Msg 1) , an RA response (RAR) (e.g., Msg 2) , and / or a Physical Uplink Shared Channel (PUSCH) (e.g., Msg 3) .
[0087] In a first implementation (e.g., of the first example) , in which UE 210 performs CSI measurement before receiving the cell switching command, the one or more CSI reports can be transmitted by Uplink Control Information (UCI) . For example, the one or more CSI reports can be transmitted using the PUSCH (e.g., Msg 3, during the CFRA procedure or the CBRA procedure) along with the RRC reconfiguration completion message (e.g., RRCReconfigurationComplete message) , as described with reference to process 300 (e.g., at block 325 or block 365) . That is, the PUSCH can be scheduled by a RAR (e.g., Msg2 RAR, associated with the CFRA procedure or the CBRA procedure) together with the RRC reconfiguration completion message.
[0088] In a second implementation (e.g., of the first example) , UE 210 can perform CSI measurement based on receiving the cell switch command (e.g., the cell switch command is modified to trigger performing CSI measurement) . In some instances, a gap (e.g., T2) between the end of a last symbol in time of the one or more CSI-RS resource sets triggered by the cell switch command and a first symbol of the PUSCH (e.g., Msg3 PUSCH, associated with the CFRA or CBRA procedure) can be larger than a computation time (e.g., T`proc, CSI) of UE 210 for determining CSI. In some such instances, the CSI report can be transmitted as part of the PUSCH (e.g., Msg3 PUSCH) based on CSI measuring being triggered by the cell switch command. That is, the CSI report can be transmitted as part of the PUSCH scheduled by the CFRA or CBRA procedure. Alternatively, in some such instances, a field (e.g., a 1-bit field, a CSI request field) can be added into the RAR (e.g., Msg2 RAR) payload indicating whether the CSI report is transmitted as part of the PUSCH. For example, a first value in the field (e.g., value ‘0’ ) can indicate that the CSI report may not be transmitted using the PUSCH, whereas a second value in the field (e.g., value ‘1’ ) can indicate that the CSI report can be transmitted using the PUSCH.
[0089] In other instances, the gap (e.g., T2) between the end of the last symbol of the one or more CSI-RS resource sets triggered by the cell switch command and the first symbol of the PUSCH (e.g., Msg3 PUSCH) can be less than the computation time (e.g., T`proc, CSI) of UE 210 for determining CSI. In some such instances, the CSI report can be transmitted using a PUSCH after the Msg3 PUSCH. For example, the CSI report can be transmitted using a first PUSCH (e.g., a Configured Grant PUSCH (CG-PUSCH) or a Dynamic Grant PUSCH (DG-PUSCH) ) after the Msg3 PUSCH that meets a condition (e.g., T2 ≥ T`proc, CSI) . In some such examples, the CSI report can be transmitted using a Msg5 PUSCH (e.g., RRCReconfigurationComplete message, UL data message) . Alternatively, in some such instances, a field (e.g., a 1-bit field, a CSI request field) can be added into an existing DCI (e.g., DCI format 1_0 and DCI format 1_1) indicating which PUSCH is used to transmit the CSI report. For example, a value in the field can indicate which PUSCH is used. In some such examples, the UE can determine which PUSCH is used to transmit the CSI report based on the value in the field.
[0090] In a second example, the CFRA procedure or the CBRA procedure (e.g., the RACH procedure at block 470) may not be triggered by the cell switch command. In some such examples, the CSI report can be transmitted as part of a first CG-PUSCH or DG-PUSCH along with the RRC reconfiguration completion message (e.g., RRCReconfigurationComplete message) . For example, the CSI report can be transmitted using the first CG-PUSCH or DG-PUSCH after the RRC reconfiguration completion which meets the condition (e.g., T2 ≥ T`proc, CSI) .
[0091] In a first implementation (e.g., of the second example) , the CSI report can be transmitted using a new MAC-CE format identified by a dedicated eLCID. That is, the CSI report can be transmitted using the new MAC-CE to avoid blind detection of the presence of the CSI report on the first PUSCH after the RRC reconfiguration completion.
[0092] In a second implementation (e.g., of the second example) , the CSI report can be transmitted using UCI on a physical layer. That is, the CSI report can be transmitted using UCI on the physical layer to avoid blind detection of the presence of the CSI report on the first PUSCH after the RRC reconfiguration completion. In some instances, a CSI report indicator signal can be introduced to indicate the presence of the CSI report. In some instances, the CSI report indicator signal can be mapped to predefined resource elements (REs) of the first PUSCH. In some such instances, an offset value (e.g., a separate beta offset value) can be provided by UE specific configuration or hard encoded to calculate the REs used for the CSI report indicator signal and the CSI reports.
[0093] As shown in process 400, cell switching can be completed (block 490) . That is, UE 210 can finish executing cell switching from the source cell to the target cell. In some examples, completing the cell switching can include transmitting an RRC reconfiguration completion message from UE 210 to the target cell (block 365) , as described with reference to process 300. In some examples, the CSI reporting can occur at a time that at least partially overlaps with completing the cell switching.
[0094] Implementing process 400 can enable performing CSI measurement and / or CSI reporting prior to or during the completion of the cell switching from a source cell to a target cell. In some examples, performing CSI measurement prior to or during cell switching can enable the network to begin performing link adaptation, thereby decreasing a delay for performing link adaption otherwise caused by performing CSI measurement after the completion of cell switching. Thus, implementing process 400 can reduce latency for the network, which can improve overall latency experienced by network devices or users of the network, among other advantages.
[0095] Fig. 5 illustrates an example CSI-RS resource set allocation scheme 500 for candidate cells of a network according to one or more implementations described herein. CSI-RS resource allocation scheme 500 illustrates a network including network devices such as UE 210, and network entities such as base stations 222 (e.g., base station 222-1, base station 222-2, base station 222-3, base station 222-4) . Base stations 222 can be representative of other network entities including gNBs or TRPs, among other examples. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0096] Base stations 222 can each be associated with one or more cells 130. CSI-RS resource allocation scheme 500 illustrates each base station 222 being associated with a respective cell 130. For example, base station 222-1 can be associated with cell 130-1, base station 222-2 can be associated with cell 130-2, base station 222-3 can be associated with cell 130-3, and base station 222-4 can be associated with cell 130-4. Although each base station 222 is illustrated as being associated with a single cell 130, it should be understood that base stations 222 can each support a different quantity respective quantity of cells 130. Cell 130-1 can be representative of a source cell for UE 210. Cell 130-2, cell 130-3, and cell 130-4 can be representative of candidate cells for UE 210.
[0097] CSI-RS resource allocation scheme 500 supports configuring CSI-RS resource sets for the candidate cells, as described with reference to process 400 (block 410) . That is, a quantity of periodic, semi-persistent, and / or aperiodic CSI-RS (e.g., P-CSI-RS, SP-CSI-RS, AP-CSI-RS) resource sets can be configured for the candidate cells. In some examples, configuring the CSI-RS resource sets for the candidate cells can include performing a configuration operation to configure the CSI-RS resources sets in accordance with CSM and IM operations.
[0098] CSI-RS resource allocation scheme 500 illustrates a first scheme 510 for configuring CSI-RS resource sets for the candidate cells, and a second scheme 520 for configuring CSI-RS resource sets for the candidate cells. In accordance with scheme 510, one CSI-RS resource set (e.g., P-CSI-RS resource set, SP-CSI-RS resource set, or AP-CSI-RS resource set) can be configured for each candidate cell (e.g., a respective CSI-RS resource set for a respective candidate cell) . That is, each candidate cell is associated with a respective CSI-RS resource set. Scheme 510 illustrates cell 130-2 being configured with a CSI-RS resource set (e.g., CSI-RS resource set #0) , and cell 130-3 being configured with a CSI-RS resource set (e.g., CSI-RS resource set #0) . In some examples, a single CSI-RS resource set can be leveraged (e.g., configured) for multiple cells 130 (e.g., CSI-RS resource set #0 for cell 130-2 is the same as CSI-RS resource set for cell 130-3) . In some examples, each CSI-RS resource set can be leveraged for a single cell 130 (e.g., CSI-RS resource set #0 for cell 130-2 is different from CSI resource set #0 for cell 130-3) . In some implementations, each CSI-RS resource set #0 illustrated in scheme 510 can be a P-CSI-RS resource set.
[0099] In some examples, a QCL source of the CSI-RS resource set configured for each candidate cell can be dynamically updated. For example, the QCL source of the CSI-RS resource set (e.g., P-CSI-RS resource set, SP-CSI-RS resource set) can be configured by a MAC-CE or an RRC signal. In accordance with scheme 520, multiple (e.g., greater than 1) CSI-RS resource sets (e.g., P-CSI-RS resource sets, SP-CSI-RS resource sets, and / or AP-CSI-RS resource sets) can be configured for each candidate cell (e.g., multiple CSI-RS resource sets for a single candidate cell) . That is, each candidate cell is associated with multiple respective CSI-RS resource sets. For example, scheme 520 illustrates cell 130-2 being configured with two CSI-RS resource sets (e.g., CSI-RS resource set #0 and CSI-RS resource set #1) . In some examples, the CSI-RS resource sets associated with one candidate cell can be at least partially leveraged for multiple cells 130. In some examples, the CSI-RS resource sets associated with one candidate cell can be uniquely defined for the candidate cell. In some implementations, each CSI-RS resource set (e.g., CSI-RS resource set #0, CSI-RS resource set #1) illustrated in scheme 520 can be a P-CSI-RS resource set.
[0100] In some examples, the QCL source of each CSI-RS resource set configured for a respective candidate cell can be preconfigured. For example, the QCL source of the CSI-RS resource sets (e.g., P-CSI-RS resource sets, SP-CSI-RS resource sets) can be configured by RRC signaling. In some examples, the QCL source of an aperiodic CSI-RS resource set can be configured by RRC signaling or determined based on a command (e.g., a triggering command) .
[0101] CSI-RS resource set allocation scheme 500 can provide examples for configuring candidate cells, which can support performing CSI measurement. Thus, implementing CSI-RS resource set allocation scheme 500 can support performing CSI measurement prior to or during execution of cell switching between the source cell (e.g., cell 130-1) and a target cell (e.g., cell 130-2, cell 130-3, cell 130-4) , which can decrease latency for performing link adaptation.
[0102] Fig. 6 is a diagram of an example aperiodic CSI report configuration 600 for candidate cells according to one or more implementations described herein. Aperiodic CSI report configuration 600 can be implemented by a network for use in configuring a UE to perform CSI reporting for a candidate cell. That is, aperiodic CSI report configuration 600 illustrates an example for how aperiodic CSI reports are related to CSI-RS resource sets for a candidate cell. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0103] A network (e.g., base station 222) can be operable to configure a UE (e.g., UE 210) to perform CSI reporting based on configuring the UE to perform operations associated with generating one or more aperiodic CSI reports for a candidate cell. For example, process 400 describes configuring the UE for CSI reporting (block 420) , in which the network can configure the UE to perform aperiodic CSI reporting. That is, the UE can be configured with one or more aperiodic CSI reports for a candidate cell, where each aperiodic CSI report is identified by a respective CSI report ID. For example, aperiodic CSI report #1 and aperiodic CSI report #2 can each be indicative of respective CSI report IDs for one or more candidate cells.
[0104] Additionally, each aperiodic CSI report can be associated with a respective CSI-RS resource set for a candidate cell. That is, each aperiodic CSI report can correspond to a respective P-CSI-RS resource set, SP-CSI-RS resource set, or AP-CSI-RS resource set. For example, aperiodic CSI report #1 is associated with CSI-RS resource set #1 of the candidate cell, and aperiodic CSI report #2 is associated with CSI-RS resource set #2 of the candidate cell. Thus, configuring the UE with a respective aperiodic CSI report can trigger the UE to perform CSI measurement on the corresponding CSI-RS resource set of the aperiodic CSI report. For example, configuring the UE with aperiodic CSI report #1 can cause the UE to perform CSI reporting based on CSI-RS resource set #1, and configuring the UE with aperiodic CSI report #2 can cause the UE to perform CSI reporting based on CSI-RS resource set #2.
[0105] Configuring the UE to perform CSI reporting can support performing CSI reporting prior to or during cell switching (e.g., from a source cell to the candidate cell) , which can reduce latency for the network performing link adaptation based on the CSI reporting. Thus, implementing aperiodic CSI report configuration 600 as described herein can support operations associated with reducing latency of the network.
[0106] Figs. 7A and 7B illustrate examples of new MAC-CEs 700 to trigger performing CSI measurement according to one or more implementations described herein. That is, MAC-CEs 700 (e.g., MAC-CE 700-1, MAC-CE 700-2) can each be an example of a new MAC-CE that can be introduced into a network signaling scheme. Transmitting either MAC-CE 700 can trigger a UE (e.g., UE 210) to perform CSI measurement, as described herein. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0107] For example, each MAC-CE 700 can instruct the UE to perform CSI measurement on one or more CSI-RS resource sets associated with one or more aperiodic CSI reports for one or more candidate cells. Each MAC-CE 700 can be associated with a structure defined by fields, which can include values indicating the UE to perform CSI measurement in accordance with respective options corresponding to the values. Each MAC-CE 700 is illustrated relative to axis 710, which can indicate a quantity of bits associated with each field. For example, a field with a length equivalent to one quantity (e.g., hash, block, slot) of axis 710 can include one bit. In some examples, each MAC-CE 700 can be identified by a MAC sub-header with a dedicated eLCID.
[0108] MAC-CE 700-1 can be associated with triggering the UE to perform CSI measurement and CSI reporting relative to a single candidate cell. MAC-CE 700-1 is illustrated with two options (e.g., option 1 and option 2) . Option 1 illustrates MAC-CE 700-1 including a field allocated for the aperiodic CSI report ID, which can indicate the UE to perform CSI measurement on one or more CSI-RS resource sets associated with the aperiodic CSI report ID. Option 2 illustrates MAC-CE 700-1 including a field allocated for the CSI-RS resource set ID (e.g., P-CSI-RS or SP-CSI-RS resource set ID) , which can indicate the UE to perform CSI measurement on one or more CSI-RS resource sets corresponding to the CSI-RS resource set ID. The CSI-RS resource set ID can indicate the UE to perform CSI measurement based on the CSI-RS resource set ID being configured to be associated with a respective aperiodic CSI report ID.
[0109] MAC-CE 700-1 (e.g., both option 1 and option 2) can include a field (e.g., an A / D field) which can be allocated to store a value indicating whether to activate or deactivate CSI measurement on a CSI-RS resource set. MAC-CE 700-1 can also include a field associated with a candidate cell ID, which can be allocated to store one or more values (e.g., 3 bits) associated with the candidate cell for which MAC-CE 700-1 applies. MAC-CE 700-1 can also include one or more reserved fields.
[0110] MAC-CE 700-2 can be associated with triggering the UE to perform CSI measurement and CSI reporting relative to multiple candidate cells. MAC-CE 700-2 can include a quantity of fields each associated with the activation or deactivation of CSI measurement for a candidate cell associated with the respective field. For example, the field designated by Ci (e.g., C1) is associated with activation or deactivation of CSI measurement for a candidate cell identified by i. That is, a value of the field can indicate to activate (e.g., value ‘1’ ) or deactivate (e.g., value ‘0’ ) CSI measurement.
[0111] MAC-CE 700-2 can include a quantity of fields each associated with the aperiodic CSI report ID (e.g., CSI-Reportk) or the CSI-RS resource set ID (e.g., CSI-RSk) . In some examples, each field can indicate the aperiodic CSI report ID or the CSI-RS resource set ID associated with a candidate cell with its ordinal position (e.g., ‘k’ ) among the candidate cells (e.g., with Ci set to 1) .
[0112] MAC-CEs 700 can support triggering performing CSI measurement, and therefore CSI reporting, prior to or during cell switching, which can reduce latency for the network performing link adaptation based on the CSI reporting. Thus, implementing MAC-CEs 700 as described herein can support operations associated with reducing latency of the network.
[0113] Fig. 8 illustrates an example of a modified MAC-CE 800 configured to trigger performing CSI measurement according to one or more implementations described herein. That is, modified MAC-CE 800 can each be an example of a MAC-CE configured for TCI state activation or deactivation, which has been modified to trigger performing CSI measurement. For example, a MAC-CE configured to perform TCI state activation or deactivation can be transmitted during DL synchronization (block 330) , as described with reference to process 300. Therefore, modifying the MAC-CE to include instructions that trigger a UE (e.g., a UE 210) to being performing CSI measurement, can cause reception of the MAC-CE at the UE to facilitate operations associated with TCI state activation or deactivation as well as performing CSI measurement. For example, a network can be operable to instruct the UE to perform CSI measurement on a candidate cell when activating a TCI state for the candidate cell. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0114] Transmitting modified MAC-CE 800 can trigger the UE to perform CSI measurement, as described herein. For example, modified MAC-CE 800 can instruct the UE to perform CSI measurement on one or more CSI-RS resource sets associated with one or more aperiodic CSI reports for one or more candidate cells. Modified MAC-CE 800 can be associated with a structure defined by fields, which can include values indicating the UE to perform CSI measurement in accordance with respective options corresponding to the values. Modified MAC-CE 800 is illustrated relative to axis 810, which can indicate a quantity of bits associated with each field. For example, a field with a length equivalent to one quantity (e.g., hash, block, slot) of axis 810 can include one bit. In some examples, modified MAC-CE 800 can be identified by a MAC sub-header with a dedicated eLCID.
[0115] Modified MAC-CE 800 can include a field allocated for indicating the candidate cell ID. Modified MAC-CE 800 can include a quantity of fields which can be reserved. Modified MAC-CE 800 can reallocate one or more (e.g., two) of the reserved fields to indicate the aperiodic CSI report ID (e.g., CSI-Reportk) or the CSI-RS resource set ID (e.g., CSI-RSk) associated with a candidate cell (e.g., the candidate cell ID) . For example, modified MAC-CE 800 can reallocate the field to include the aperiodic CSI report ID, which can indicate the UE to perform CSI measurement on one or more CSI-RS resource sets associated with the aperiodic CSI report ID. Alternatively, modified MAC-CE 800 can reallocate the field to include the CSI-RS resource set ID (e.g., P-CSI-RS or SP-CSI-RS resource set ID) , which can indicate the UE to perform CSI measurement on one or more CSI-RS resource sets corresponding to the CSI-RS resource set ID. Modified MAC-CE 800 can also include a quantity of other fields, such as fields directed to TCI state IDs.
[0116] Implementing instructions for performing CSI measurement within an existing MAC-CE can enable the network to leverage existing signaling schemes for initiating CSI measurement at the UE. Leveraging existing signaling can reduce overhead or latency otherwise associated with implementing new signaling, among other advantages. Additionally, modified MAC-CE 800 supporting performing CSI measurement, and therefore CSI reporting, prior to or during cell switching can reduce latency for the network performing link adaptation based on the CSI reporting. Therefore, implementing modified MAC-CE 800 as described herein can support operations associated with reducing latency of the network.
[0117] Fig. 9 illustrates an example of a modified MAC-CE 900 configured to trigger performing CSI measurement according to one or more implementations described herein. That is, modified MAC-CE 900 can be an example of a cell switching command MAC-CE, which has been modified to trigger performing CSI measurement. For example, a cell switching command MAC-CE can be configured to trigger performing cell switching from a source cell to a target cell (block 350, block 440) as described with reference to process 300 and process 400. Therefore, modifying the cell switching command MAC-CE to include instructions that trigger a UE (e.g., a UE 210) to being performing CSI measurement, can cause reception of the cell switching command MAC-CE at the UE to initiate operations associated with executing cell switching as well as performing CSI measurement. For example, a network can be operable to instruct the UE to perform CSI measurement on a candidate cell when switching to the candidate cell. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0118] Transmitting modified MAC-CE 900 can trigger the UE to perform CSI measurement, as described herein. For example, modified MAC-CE 900 can instruct the UE to perform CSI measurement on one or more CSI-RS resource sets associated with one or more aperiodic CSI reports for one or more candidate cells. Modified MAC-CE 900 can be associated with a structure defined by fields, which can include values indicating the UE to perform CSI measurement in accordance with respective options corresponding to the values. Modified MAC-CE 900 is illustrated relative to axis 910, which can indicate a quantity of bits associated with each field. For example, a field with a length equivalent to one quantity (e.g., hash, block, slot) of axis 910 can include one bit. In some examples, modified MAC-CE 900 can be identified by a MAC sub-header with a dedicated eLCID.
[0119] Modified MAC-CE 900 can initially include a field reserved for indicating a target configuration ID, which can be reallocated for indicating the candidate cell ID subject to CSI measurement. Modified MAC-CE 900 can also include a quantity of fields which can be initially reserved. However, modified MAC-CE 900 can be configured such that one or more (e.g., two) of the reserved fields are allocated to indicate the aperiodic CSI report ID (e.g., CSI-Reportk) or the CSI-RS resource set ID (e.g., CSI-RSk) associated with a candidate cell (e.g., the candidate cell ID) . For example, modified MAC-CE 900 can reallocate the field to include the aperiodic CSI report ID, which can indicate the UE to perform CSI measurement on one or more CSI-RS resource sets associated with the aperiodic CSI report ID.
[0120] Additionally, or alternatively, modified MAC-CE 900 can initially include one or more fields which can be associated with TCI state IDs. However, modified MAC-CE 900 can be configured such that one of the TCI state IDs are reallocated to indicate a QCL source of the CSI-RS resource set. That is, modified MAC-CE 900 can include a field indicating the QCL source for the triggered CSI-RS resource set associated with the aperiodic CSI report ID. Additionally, or alternatively, modified MAC-CE 900 can include a field associated with a Synchronization Signal Block (SSB) index or Physical Broadcast Channel (PBCH) index, which can be reallocated to indicate the QCL source of the CSI-RS resource set. Modified MAC-CE 900 can also include a quantity of other fields, such as fields directed to TA command, RA preamble, reserved, and so forth.
[0121] In some examples, modified MAC-CE 900 can be associated with a timing relation for performing CSI measurement after receiving modified MAC-CE 900 at the UE. For example, for an SP-CSI-RS resource set, CSI measuring (e.g., activating the SP-CSI-RS resource set) can begin during a first slot that is after slot n + 3ms, where n is a slot in which the UE receives modified MAC-CE 900. For an AP-CSI-RS resource set, a slot offset can be configured via RRC signaling for the respective AP-CSI-RS resource set. The slot offset can define an offset between a slot associated with receiving modified MAC-CE 900, and a slot in which the AP-CSI-RS resource set is transmitted by the candidate cell.
[0122] Implementing instructions for performing CSI measurement within an existing MAC-CE can enable the network to leverage existing signaling schemes for initiating CSI measurement at the UE. Leveraging existing signaling can reduce overhead or latency otherwise associated with implementing new signaling, among other advantages. Additionally, modified MAC-CE 900 can support performing CSI measurement, and therefore CSI reporting, prior to or during cell switching which can reduce latency for the network performing link adaptation based on the CSI reporting. Therefore, implementing modified MAC-CE 900 as described herein can support operations associated with reducing latency of the network.
[0123] Figs. 10A and 10B illustrate examples of DCI formats 1000 configured to trigger performing CSI measurement according to one or more implementations described herein. That is, DCI format 1000-1 can be an example of a new DCI format that can be introduced into a network signaling scheme to trigger CSI measurement at a UE (e.g., a UE 210) . However, DCI format 1000-2 can each be an example of an existing DCI format (e.g., DCI format 1_0) that initiates a PDCCH order associated with a RACH procedure, which has been modified to trigger performing CSI measurement. Alternatively, DCI format 1000-2 can be an example of an existing DCI format (e.g., DCI format 1_1) that is associated with not performing DL data scheduling, which has been modified to trigger performing CSI measurement. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0124] Transmitting either DCI format 1000 to the UE can trigger the UE to perform CSI measurement, as described herein. For example, each DCI format 1000 can instruct the UE to perform CSI measurement on one or more CSI-RS resource sets associated with one or more aperiodic CSI reports for one or more candidate cells. Each DCI format 1000 can be associated with a structure defined by fields or blocks, which can include values indicating the UE to perform CSI measurement in accordance with respective options corresponding to the values.
[0125] DCI format 1000-1 can be a group common DCI format (e.g., 2-X) introduced to instruct multiple UEs to perform CSI reports on different candidate cells. DCI format 1000-1 can include a quantity of blocks (e.g., Block #1, Block #2, Block #N, where N is indicative of a quantity of blocks) . DCI format 1000-1 can also include CRC which is scrambled by XORing bits of a 16-bit Radio Network Temporary Identifier (X-RNTI) . In some examples, RRC signaling can be implemented to indicate an index mapping each UE to a respective block.
[0126] In some implementations, each block can include the candidate cell ID, and the aperiodic CSI report ID (e.g., CSI-Reportk) or the CSI-RS (e.g., P-CSI-RS or SP-CSI-RS) resource set ID (e.g., CSI-RSk) , as described herein. In other implementations, the aperiodic CSI report IDs can be indexed across candidate cells with different candidate cell IDs (e.g., each aperiodic CSI report ID corresponds to a respective candidate cell ID) , such that there are no duplicated aperiodic CSI report IDs indexed for multiple candidate cells. In some such implementations, each block can include the candidate cell ID, the aperiodic CSI report ID, or the CSI-RS resource set ID.
[0127] In a first example, DCI format 1000-2 can include modifications to an existing DCI format (e.g., DCI format 1_0) associated with initiating a PDDCH order for a candidate cell. In some such examples, a Frequency Domain Resource Assignment (FDRA) field of the existing DCI format can be reset to a same value (e.g., ‘1’ ) . Additionally, a subset of reserved bits can be repurposed to indicate the aperiodic CSI report ID (e.g., CSI-Reportk) or the CSI-RS (e.g., P-CSI-RS or SP-CSI-RS) resource set ID (e.g., CSI-RSk) , as described herein. In some examples, the existing DCI format can already include an indication of the candidate cell ID.
[0128] In a second example, DCI format 1000-2 can include modification to an existing DCI format (e.g., DCI format 1_1) , which includes a quantity of reserved bits. A subset of the reserved bits can be repurposed to indicate a single block number field, as described herein. That is, when the aperiodic CSI report IDs are indexed across candidate cells with different candidate cell IDs, each block can include only the candidate cell ID, the aperiodic CSI report ID, or the CSI-RS resource set ID. Thus, the subset of reserved bits can be repurposed to indicate the candidate cell ID, the aperiodic CSI report ID, or the CSI-RS resource set ID.
[0129] In a third example, DCI format 1000-2 can include additions to an existing DCI format (e.g., DCI format 1_1) . For example, the signal block number field as described herein can be added to the existing DCI format. That is, a field for the candidate cell ID, the aperiodic CSI report ID, or the CSI-RS resource set ID can be added to the existing DCI format.
[0130] DCI formats 1000 can support triggering performing CSI measurement, and therefore CSI reporting, prior to or during cell switching, which can reduce latency for the network performing link adaptation based on the CSI reporting. Thus, implementing DCI formats 1000 as described herein can support operations associated with reducing latency of the network. Additionally, implementing instructions for performing CSI measurement within an existing DCI format, as in DCI format 1000-2, can enable the network to leverage existing signaling schemes for initiating CSI measurement at the UE. Leveraging existing signaling can reduce overhead or latency otherwise associated with implementing new signaling, among other advantages.
[0131] Fig. 11 is a diagram of an example RE mapping 1100 for transmitting a CSI report according to one or more implementations described herein. The RE mapping 1100 can be implemented for transmitting a CSI report from a UE (e.g., UE 210) to a network (e.g., a target cell of the network) , as described with reference to process 400 (block 480) . That is, the CSI report can be transmitted from the UE using a CG-PUSCH or a DG-PUSCH along with an RRC reconfiguration completion message (e.g., RRCReconfigurationComplete message) . For example, the CSI report can be transmitted using a first CG-PUSCH or a first DG-PUSCH after RRC reconfiguration completion, which meets a condition (e.g., associated with a duration between a CSI-RS resource set and a Msg3 PUSCH being greater than UE computation time for determining CSI, T2 ≥ T`proc, CSI) . In some examples, the CSI report can be transmitted using a first CG-PUSCH or a DG-PUSCH based on a cell switching command not triggering a CBRA or a CFRA procedure. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0132] In some examples, the CSI report can be transmitted using UCI on a physical layer. For example, the CSI report can be transmitted using UCI on the physical layer to avoid blind detection of the presence of the CSI report on the first PUSCH after the RRC reconfiguration completion. In some examples, a CSI report indicator signal can be used to indicate the presence of the CSI report, where the CSI report indicator signal is mapped to predefined REs of the PUSCH. In some implementations, an offset value can be provided by UE specific configuration or hard encoding to calculate the REs used for the CSI report indicator signal and the CSI reports. For example, the offset value can be a separate beta offset value (e.g., ) which can be introduce in the formula, as represented herein:
[0133] RE mapping 1100 can include a quantity of REs which can be organized along an axis (e.g., a vertical axis) associated with subcarriers in a resource block and along an axis (e.g., a horizontal axis) associated with Orthogonal Frequency Division Multiplexing (OFDM) symbols in a slot. RE mapping 1100 illustrates REs used for the CSI report indicator signal and REs used for CSI transmission on the PUSCH towards the respective candidate cell. RE mapping 1100 also illustrates REs used for one or more Demodulation Reference Signals (DM-RS) .
[0134] RE mapping 1100 can support CSI reporting prior to or during completion of cell switching, which can be associated with reduced latency for a network. That is, CSI reporting with a delay after completion of cell switching can cause a delay for the network performing link adaptation, which can be associated with relatively high latency for the network. Thus, implementing RE mapping 1100 as described herein can reduce latency otherwise associated with performing CSI reporting relative to cell switching, among other advantages.
[0135] Fig. 12 is a diagram of an example of components of a device configured to perform CSI measurement before or during a mobility procedure according to one or more implementations described herein. In some implementations, device 1200 can include application circuitry 1202, baseband circuitry 1204, RF circuitry 1206, front-end module (FEM) circuitry 1208, one or more antennas 1210, and power management circuitry (PMC) 1212 coupled together at least as shown. In some implementations, device 1200 can include fewer elements (e.g., a RAN node may not utilize application circuitry 1202 and can instead include a processor / controller to process data received from a core network. In some implementations, device 1200 can include additional elements such as, for example, memory / storage, display, camera, sensor (including one or more temperature sensors, such as a single temperature sensor, a plurality of temperature sensors at different locations in device 1200, etc. ) , or input / output (I / O) interface. In other implementations, the components described below can be included in more than one device (e.g., said circuitries can be separately included in more than one device for cloud-RAN (C-RAN) implementations) . The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0136] Application circuitry 1202 can include one or more application processors. For example, application circuitry 1202 can include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor (s) can include any combination of general-purpose processors and dedicated processors (e.g., graphics processors, application processors, etc. ) . The processors can be coupled with or can include memory / storage and can be configured to execute instructions stored in the memory / storage to enable various applications or operating systems to run on device 1200. In some implementations, processors of application circuitry 1202 can process data packets received from a core network.
[0137] Baseband circuitry 1204 can include circuitry such as, but not limited to, one or more single-core or multi-core processors. Baseband circuitry 1204 can include one or more baseband processors or control logic to process baseband signals received from a receive signal path of RF circuitry 1206 and to generate baseband signals for a transmit signal path of RF circuitry 1206. Baseband circuity 1204 can interface with application circuitry 1202 for generation and processing of the baseband signals and for controlling operations of RF circuitry 1206. For example, in some implementations, baseband circuitry 1204 can include a 3G baseband processor 1204A, a 4G baseband processor 1204B, a 5G baseband processor 1204C, or other baseband processor (s) 1204D for other existing generations, generations in development or to be developed in the future (e.g., 5G, 6G, 12G, etc. ) .
[0138] Baseband circuitry 1204 (e.g., one or more of baseband processors 1204A-D) can handle various radio control functions that enable communication with one or more radio networks via RF circuitry 1206. In other implementations, some or all of the functionality of baseband processors 1204A-D can be included in modules stored in memory 1204G and executed via a central processing unit (CPU) 1204E. The radio control functions can include, but are not limited to, signal modulation / demodulation, encoding / decoding, radio frequency shifting, etc. In some implementations, modulation / demodulation circuitry of baseband circuitry 1204 can include Fast-Fourier Transform (FFT) , precoding, or constellation mapping / de-mapping functionality. In some implementations, encoding / decoding circuitry of baseband circuitry 1204 can include convolution, tail-biting convolution, turbo, Viterbi, or low-density parity check (LDPC) encoder / decoder functionality. Implementations of modulation / demodulation and encoder / decoder functionality are not limited to these examples and can include other suitable functionality in other implementations.
[0139] In some implementations, memory 1204G can receive and / or store information and instructions for CSI reporting in a mobility procedure. For example, UE 210 or baseband circuitry 1204 can be configured to determine CSI based on CSI-RS resource sets associated with candidate cells and perform CSI reporting prior to or during the mobility procedure. Performing CSI reporting prior to or during the mobility procedure can decrease a delay associated with a network initiating performing link adaptation, which can improve latency of the network, among other advantages. Many other aspects and examples are also described herein.
[0140] In some implementations, baseband circuitry 1204 can include one or more audio digital signal processor (s) (DSP) 1204F. Audio DSP 1204F can include elements for compression / decompression and echo cancellation and can include other suitable processing elements in other implementations. Components of baseband circuitry 1204 can be suitably combined in a single chip, a single chipset, or disposed on a same circuit board in some implementations. In some implementations, some or all of the constituent components of baseband circuitry 1204 and application circuitry 1202 can be implemented together such as, for example, on a system on a chip (SOC) .
[0141] In some implementations, baseband circuitry 1204 can provide for communication compatible with one or more radio technologies. For example, in some implementations, baseband circuitry 1204 can support communication with a NG-RAN, an evolved universal terrestrial radio access network (EUTRAN) or other wireless metropolitan area networks (WMAN) , a wireless local area network (WLAN) , a wireless personal area network (WPAN) , etc. Implementations in which baseband circuitry 1204 is configured to support radio communications of more than one wireless protocol can be referred to as multi-mode baseband circuitry.
[0142] RF circuitry 1206 can enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various implementations, RF circuitry 1206 can include switches, filters, amplifiers, etc., to facilitate the communication with the wireless network. RF circuitry 1206 can include a receive signal path which can include circuitry to down-convert RF signals received from FEM circuitry 1208 and provide baseband signals to baseband circuitry 1204. RF circuitry 1206 can also include a transmit signal path which can include circuitry to up-convert baseband signals provided by baseband circuitry 1204 and provide RF output signals to FEM circuitry 1208 for transmission.
[0143] In some implementations, the receive signal path of RF circuitry 1206 can include mixer circuitry 1206A, amplifier circuitry 1206B and filter circuitry 1206C. In some implementations, the transmit signal path of RF circuitry 1206 can include filter circuitry 1206C and mixer circuitry 1206A. RF circuitry 1206 can also include synthesizer circuitry 1206D for synthesizing a frequency for use by mixer circuitry 1206A of the receive signal path and the transmit signal path. In some implementations, mixer circuitry 1206A of the receive signal path can be configured to down-convert RF signals received from FEM circuitry 1208 based on the synthesized frequency provided by synthesizer circuitry 1206D. Amplifier circuitry 1206B can be configured to amplify the down-converted signals and filter circuitry 1206C can be a low-pass filter (LPF) or band-pass filter (BPF) configured to remove unwanted signals from the down-converted signals to generate output baseband signals. Output baseband signals can be provided to baseband circuitry 1204 for further processing. In some implementations, the output baseband signals can be zero-frequency baseband signals, although this may not be a requirement. In some implementations, mixer circuitry 1206A of the receive signal path can comprise passive mixers, although the scope of the implementations is not limited in this respect.
[0144] In some implementations, mixer circuitry 1206A of the transmit signal path can be configured to up-convert input baseband signals based on the synthesized frequency provided by synthesizer circuitry 1206D to generate RF output signals for FEM circuitry 1208. The baseband signals can be provided by baseband circuitry 1204 and can be filtered by filter circuitry 1206C. In some implementations, mixer circuitry 1206A of the receive signal path and mixer circuitry 1206A of the transmit signal path can include two or more mixers and can be arranged for quadrature down conversion and up conversion, respectively. In some implementations, mixer circuitry 1206A of the receive signal path and mixer circuitry 1206A of the transmit signal path can include two or more mixers and can be arranged for image rejection. In some implementations, mixer circuitry 1206A of the receive signal path and mixer circuitry 1206A can be arranged for direct down conversion and direct up conversion, respectively. In some implementations, mixer circuitry 1206 of the receive signal path and mixer circuitry 1206A of the transmit signal path can be configured for super-heterodyne operation.
[0145] In some implementations, the output baseband signals, and the input baseband signals can be analog baseband signals, although the scope of the implementations is not limited in this respect. In some alternate implementations, the output baseband signals, and the input baseband signals can be digital baseband signals. In these alternate implementations, RF circuitry 1206 can include analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuitry and baseband circuitry 1204 can include a digital baseband interface to communicate with RF circuitry 1206.
[0146] In some dual-mode implementations, a separate radio integrated circuitry can be provided for processing signals for each spectrum, although the scope of the implementations is not limited in this respect. In some implementations, synthesizer circuitry 1206D can be a fractional-N synthesizer or a fractional N / N+1 synthesizer, although the scope of the implementations is not limited in this respect as other types of frequency synthesizers can be suitable. For example, synthesizer circuitry 1206D can be a delta-sigma synthesizer, a frequency multiplier, or a synthesizer comprising a phase-locked loop with a frequency divider.
[0147] Synthesizer circuitry 1206D can be configured to synthesize an output frequency for use by mixer circuitry 1206A of RF circuitry 1206 based on a frequency input and a divider control input. In some implementations, synthesizer circuitry 1206D can be a fractional N / N+1 synthesizer. In some implementations, frequency input can be provided by a voltage-controlled oscillator (VCO) . Divider control input can be provided by either baseband circuitry 1204 or the applications circuitry 1202 depending on the desired output frequency. In some implementations, a divider control input (e.g., N) can be determined from a look-up table based on a channel indicated by the applications circuitry 1202.
[0148] Synthesizer circuitry 1206D of RF circuitry 1206 can include a divider, a delay-locked loop (DLL) , a multiplexer, and a phase accumulator. In some implementations, the divider can be a dual modulus divider (DMD) , and the phase accumulator can be a digital phase accumulator (DPA) . In some implementations, the DMD can be configured to divide the input signal by either N or N+1 (e.g., based on a carry out) to provide a fractional division ratio. In some example implementations, the DLL can include a set of cascaded, tunable, delay elements, a phase detector, a charge pump and a D-type flip-flop. In these implementations, the delay elements can be configured to break a VCO period up into Nd equal packets of phase, where Nd is the number of delay elements in the delay line. In this way, the DLL provides negative feedback to help ensure that the total delay through the delay line is one VCO cycle.
[0149] In some implementations, synthesizer circuitry 1206D can be configured to generate a carrier frequency as the output frequency, while in other implementations, the output frequency can be a multiple of the carrier frequency (e.g., twice the carrier frequency, four times the carrier frequency) and used in conjunction with quadrature generator and divider circuitry to generate multiple signals at the carrier frequency with multiple different phases with respect to each other. In some implementations, the output frequency can be a LO frequency (fLO) . In some implementations, RF circuitry 1206 can include an in-phase / quadrature (I / Q) / polar converter.
[0150] FEM circuitry 1208 can include a receive signal path which can include circuitry configured to operate on RF signals received from one or more antennas 1210, amplify the received signals and provide the amplified versions of the received signals to RF circuitry 1206 for further processing. FEM circuitry 1208 can also include a transmit signal path which can include circuitry configured to amplify signals for transmission provided by RF circuitry 1206 for transmission by one or more of the one or more antennas 1210. In various implementations, the amplification through the transmit or receive signal paths can be done solely in RF circuitry 1206, solely in FEM circuitry 1208, or in both RF circuitry 1206 and FEM circuitry 1208.
[0151] In some implementations, FEM circuitry 1208 can include a transmit / receive switch to switch between transmit mode and receive mode operation. FEM circuitry 1208 can include a receive signal path and a transmit signal path. The receive signal path of FEM circuitry 1208 can include a low noise amplifier to amplify received RF signals and provide the amplified received RF signals as an output (e.g., to RF circuitry 1206) . The transmit signal path of FEM circuitry 1208 can include a power amplifier to amplify input RF signals (e.g., provided by RF circuitry 1206) , and one or more filters to generate RF signals for subsequent transmission (e.g., by one or more of one or more antennas 1210) .
[0152] In some implementations, PMC 1212 can manage power provided to baseband circuitry 1204. In particular, PMC 1212 can control power-source selection, voltage scaling, battery charging, or direct current (DC) to DC (DC-to-DC) conversion. PMC 1212 can often be included when device 1200 is capable of being powered by a battery, for example, when device 1200 is included in a UE. PMC 1212 can increase the power conversion efficiency while providing desirable implementation size and heat dissipation characteristics.
[0153] While Fig. 12 shows PMC 1212 coupled only with baseband circuitry 1204. However, in other implementations, PMC 1212 can be additionally or alternatively coupled with, and perform similar power management operations for, other components such as, but not limited to, application circuitry 1202, RF circuitry 1206, or FEM circuitry 1208.
[0154] In some implementations, PMC 1212 can control, or otherwise be part of, various power saving mechanisms of device 1200. For example, if device 1200 is in an RRC_Connected state, where device 1200 is still connected to the RAN node as device 1200 expects to receive traffic shortly, then device 1200 can enter a state known as discontinuous reception mode (DRX) after a period of inactivity. During this state, device 1200 can power down for brief intervals of time and thus save power.
[0155] If there is no data traffic activity for an extended period of time, then device 1200 can transition off to an RRC_Idle state, where device 1200 disconnects from the network and does not perform operations such as channel quality feedback, handover, etc. Device 1200 can go into a very low power state and device 1200 can perform paging where again device 1200 periodically can wake up to listen to the network and then power down again. Device 1200 may not receive data in this state; in order to receive data, device 1200 can transition back to RRC_Connected state.
[0156] An additional power saving mode can allow a device to be unavailable to the network for periods longer than a paging interval (ranging from seconds to a few hours) . During this time, the device 1200 can be unreachable to the network and can power down completely. Any data sent during this time can incur a large delay and device 1200 can assume the delay is acceptable.
[0157] Processors of application circuitry 1202 and processors of baseband circuitry 1204 can be used to execute elements of one or more instances of a protocol stack. For example, processors of baseband circuitry 1204, alone or in combination, can be used execute Layer 3, Layer 2, or Layer 1 functionality, while processors of baseband circuitry 1204 can utilize data (e.g., packet data) received from these layers and further execute Layer 4 functionality (e.g., transmission communication protocol (TCP) and user datagram protocol (UDP) layers) . As referred to herein, Layer 3 can comprise a radio resource control layer. As referred to herein, Layer 2 can comprise a medium access control layer, a radio link control layer, and a packet data convergence protocol layer, described in further detail below. As referred to herein, Layer 1 can comprise a physical layer of a UE / RAN node.
[0158] Fig. 13 is a diagram of example interfaces 1300 of baseband circuitry configured to perform CSI measurement before or during a mobility procedure according to one or more implementations described herein. One or more components or features of example interfaces 1300 can correspond to one or more components or features described above or elsewhere. Baseband circuitry 1304 can comprise processors 1304A, 1304B, 1304C, 1304D, and 1304E and a memory 1304G utilized by said processors. Each of processors 1304A, 1304B, 1304C, 1304D, and 1304E can include a memory interface, 1306A, 1306B, 1306C, 1306D, and 1306E, respectively, to send / receive data to / from memory 1304G. Baseband circuitry can be a component of a UE and / or another type of device or system capable of transmitting and / or receiving wireless signals. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0159] In some implementations, memory 1304G can receive, store, and / or provide information and instructions for CSI reporting in a mobility procedure. The information and instructions can support instructing UE 210 or baseband circuitry 1204 to initiate measuring CSI prior to or during the mobility procedure. That is, UE 210 or baseband circuitry 1204 can determine CSI and transmit CSI reports to the network, which can decrease a delay associated with the network performing link adaptation. Decreasing the delay can improve overall latency of the network and the associated network devices. These and many other features and examples are described herein.
[0160] Baseband circuitry 1304 can further include one or more interfaces to communicatively couple to other circuitries / devices, such as memory interface 1312 (e.g., an interface to send / receive data to / from memory external to baseband circuitry 1304) , an application circuitry interface 1314 (e.g., an interface to send / receive data to / from the application circuitry as described herein) , an RF circuitry interface 1316, a wireless hardware connectivity interface 1318 (e.g., an interface to send / receive data to / from near field communication components, components (e.g., Low Energy) , components, and other communication components) , and a power management interface 1320 (e.g., an interface to send / receive power or control signals to / from a PMC) .
[0161] Fig. 14 is a block diagram illustrating components, according to some example implementations, able to read instructions from a machine-readable or computer-readable medium (e.g., a non-transitory machine-readable storage medium) and perform any one or more of the methodologies directed to performing CSI measurement before or during a mobility procedure, as discussed herein. Specifically, Fig. 14 shows a diagrammatic representation of hardware resources 1400 including one or more processors 1410 (or processor cores) , one or more memory / storage devices 1420, and one or more communication resources 1430, each of which can be communicatively coupled via a bus 1440. For implementations where node virtualization or network function virtualization is utilized, a hypervisor can be executed to provide an execution environment for one or more network slices / sub-slices to utilize hardware resources 1400. Hardware resources 1400 can interact with hypervisor 1402. For example, hypervisor 1402 can schedule or otherwise manage hardware resource 1400. The techniques described herein can support systems, methods, and devices for CSI reporting in a mobility procedure.
[0162] Processors 1410 (e.g., a central processing unit (CPU) , a reduced instruction set computing (RISC) processor, a complex instruction set computing (CISC) processor, a graphics processing unit (GPU) , a digital signal processor (DSP) such as a baseband processor, an application specific integrated circuit (ASIC) , a radio-frequency integrated circuit (RFIC) , another processor, or any suitable combination thereof) can include, for example, a processor 1412 and a processor 1414.
[0163] Memory / storage devices 1420 can include main memory, disk storage, or any suitable combination thereof. Memory / storage devices 1420 can include, but are not limited to any type of volatile or non-volatile memory such as 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 storage, etc.
[0164] In some implementations, memory / storage devices 1420 receive and / or store information and instructions 1455 for CSI reporting in a mobility procedure. The information and instructions 1455 can support instructing UE 210 or baseband circuitry 1204 to initiate measuring CSI prior to or during the mobility procedure. That is, UE 210 or baseband circuitry 1204 can determine CSI and transmit CSI reports to the network, which can decrease a delay associated with the network performing link adaptation. Decreasing the delay can improve overall latency of the network and the associated network devices. Many other aspects and examples are also described herein.
[0165] Communication resources 1430 can include interconnection or network interface components or other suitable devices to communicate with one or more peripheral devices 1404 or one or more databases 1406 via a network 1408. For example, communication resources 1430 can include wired communication components (e.g., for coupling via a universal serial bus) , cellular communication components, near field communication components, components (e.g., Low Energy) , components, and other communication components.
[0166] Instructions 1450A, 1450B, 1450C, 1450D, and / or 1450E can comprise software, a program, an application, an applet, an app, or other executable code for causing at least any of processors 1410 to perform any one or more of the methodologies discussed herein. Instructions 1450 can reside, completely or partially, within at least one of processors 1410 (e.g., within a cache memory) , memory / storage devices 1420, or any suitable combination thereof. Furthermore, any portion of instructions 1450A-E can be transferred to hardware resources 1400 from any combination of peripheral devices 1404 or databases 1406. Accordingly, memory of processors 1410, memory / storage devices 1420, peripheral devices 1404, and databases 1406 are examples of computer-readable and machine-readable media.
[0167] Fig. 15 is a diagram of an example process 1500 for CSI reporting in a mobility procedure according to one or more implementations described herein. As shown, process 1500 can be implemented by UE 210 and / or baseband circuitry 1204. In some implementations, some or all of process 1500 can be performed by one or more other systems or devices, including one or more of the devices of Fig. 2. Additionally, process 1500 can include one or more fewer, additional, differently ordered and / or arranged operations than those shown in Fig. 15. In some implementations, some or all of the operations of process 1500 can be performed independently, successively, simultaneously, etc., of one or more of the other operations of process 1500. As such, the techniques described herein are not limited to the number, sequence, arrangement, timing, etc., of the operations or processes depicted in Fig. 15.
[0168] As shown, process 1500 can include receiving instructions, from a source cell, to initiate a channel state information (CSI) measurement on one or more CSI-reference signal (CSI-RS) resource sets associated with one or more candidate cells (block 1510) . Process 1500 can include performing, based on the instructions, a CSI measurement on the one or more CSI-RS resource sets to determine CSI associated with the one or more candidate cells (block 1520) . Process 1500 can include performing, based on the instructions and as part of a mobility procedure, cell switching from the source cell to a candidate cell of the one or more candidate cells (block 1530) . Process 1500 can include generating one or more CSI reports based on the CSI measurement performed on the one or more CSI-RS resource sets (block 1540) . Process 1500 can include transmitting, to the candidate cell, the one or more CSI reports (block 1550) . One or more of the examples described herein can also, or alternatively, be part of process 1500.
[0169] Fig. 16 is a diagram of an example process 1600 for CSI reporting in a mobility procedure according to one or more implementations described herein. As shown, process 1600 can be implemented by base station 222, satellite 260, or another type of network access device. In some implementations, some or all of process 1600 can be performed by one or more other systems or devices, including one or more of the devices of Fig. 2. Additionally, process 1600 can include one or more fewer, additional, differently ordered and / or arranged operations than those shown in Fig. 16. In some implementations, some or all of the operations of process 1600 can be performed independently, successively, simultaneously, etc., of one or more of the other operations of process 1600. As such, the techniques described herein are not limited to the number, sequence, arrangement, timing, etc., of the operations or processes depicted in Fig. 16.
[0170] As shown, process 1600 can include transmitting instructions, from a source cell to a user equipment (UE) , to initiate a channel state information (CSI) measurement on one or more CSI-reference signal (CSI-RS) resource sets associated with one or more candidate cells (block 1610) . Process 1600 can include performing, based on the instructions and as part of a mobility procedure, cell switching of the UE from the source cell to a candidate cell of the one or more candidate cells (block 1620) . One or more of the examples described herein can also, or alternatively, be part of process 1600.
[0171] Examples herein can include subject matter such as a method, means for performing acts or blocks of the method, at least one machine-readable medium including executable instructions that, when performed by a machine (e.g., a processor (e.g., processor, etc. ) with memory, an application-specific integrated circuit (ASIC) , a field programmable gate array (FPGA) , or the like) cause the machine to perform acts of the method or of an apparatus or system for concurrent communication using multiple communication technologies according to implementations and examples described.
[0172] In example 1, which can also include one or more of the examples described herein, a user equipment (UE) can include one or more processors configured to perform operations including: receiving instructions, from a source cell, to initiate a channel state information (CSI) measurement on one or more CSI-reference signal (CSI-RS) resource sets associated with one or more candidate cells; performing, based on the instructions, a CSI measurement on the one or more CSI-RS resource sets to determine CSI associated with the one or more candidate cells; performing, based on the instructions and as part of a mobility procedure, cell switching from the source cell to a candidate cell of the one or more candidate cells; generating one or more CSI reports based on the CSI measurement performed on the one or more CSI-RS resource sets; and transmitting, to the candidate cell, the one or more CSI reports.
[0173] In example 2, which can also include one or more of the examples described herein, the one or more processors are further configured to perform operations including: receiving configuration information from the source cell, the configuration information configuring the one or more CSI reports associated with the one or more candidate cells to the UE, where each CSI report is identified by a CSI report ID, and where receiving the instructions is based on receiving the configuration information.
[0174] In example 3, which can also include one or more of the examples described herein, the one or more processors are further configured to perform operations including: receiving a command that is modified based on a mobility procedure cell switch command Medium Access Control (MAC) Control Element (MAC-CE) to trigger performing the cell switching from the source cell to the candidate cell and CSI measurement on the candidate cell, where performing the cell switching is based on receiving the command.
[0175] In example 4, which can also include one or more of the examples described herein, the command includes the instructions to initiate the CSI measurement on the candidate cell indicated in the command, and the instructions are indicated by a new field based on repurposing reserved bits in a mobility procedure cell switch command MAC-CE.
[0176] In example 5, which can also include one or more of the examples described herein, receiving the instructions to initiate the CSI measurement occurs before performing the cell switching from the source cell to the candidate cell.
[0177] In example 6, which can also include one or more of the examples described herein, to receive the instructions to initiate the CSI measurement before performing the cell switching, the one or more processors are further configured to perform operations including: receiving a first Medium Access Control (MAC) Control Element (MAC-CE) from the source cell including the instructions to initiate CSI measurement for the candidate cell before receiving a second MAC-CE triggering performing the cell switching from the source cell to the candidate cell.
[0178] In example 7, which can also include one or more of the examples described herein, the first MAC-CE is identified by a dedicated enhanced Logical Channel identity (eLCID) , and can include: one or more candidate cell ID fields indicating identities of the one or more candidate cells for which the MAC-CE applies; and one or more aperiodic CSI report ID fields or one or more periodic CSI-RS resource set or semi-persistent CSI-RS resource set ID fields, where each field indicates identities of one or more periodic CSI-RS resource sets or semi-persistent CSI-RS resource sets used for CSI computation for the one or more candidate cells including the candidate cell.
[0179] In example 8, which can also include one or more of the examples described herein, the first MAC-CE is associated with the candidate cell of the one or more candidate cells identified by a respective candidate cell ID field of the one or more candidate cell ID fields, and where the instructions to initiate the CSI measurement on one or more CSI-RS resource sets indicated by the one or more aperiodic CSI report ID fields or the one or more periodic CSI-RS resource set or semi-persistent CSI-RS resource set ID fields are associated with the candidate cell of the one or more candidate cells.
[0180] In example 9, which can also include one or more of the examples described herein, the first MAC-CE is associated with multiple candidate cells identified by respective candidate cell ID fields, and where the instructions to initiate the CSI measurement on one or more CSI-RS resource sets indicated by the one or more aperiodic CSI report ID fields or the one or more periodic CSI-RS resource set or semi-persistent CSI-RS resource set ID fields are associated with the multiple candidate cells.
[0181] In example 10, which can also include one or more of the examples described herein, the first MAC-CE can include a modified MAC-CE used before performing the cell switching, the modified MAC-CE can include bits reserved in candidate cell configuration indicator (TCI) states activation or deactivation MAC-CE repurposed to indicate a CSI-RS resource set associated with the candidate cell for performing the CSI measurement.
[0182] In example 11, which can also include one or more of the examples described herein, to receive the instructions to initiate the CSI measurement, the one or more processors are further configured to perform operations including: receiving a downlink control information (DCI) format including the instructions.
[0183] In example 12, which can also include one or more of the examples described herein, the DCI format is received from the source cell to initiate the CSI measurement on the candidate cell before performing the cell switching from the source cell to the candidate cell.
[0184] In example 13, which can also include one or more of the examples described herein, the DCI format can include a modified DCI format used before performing the cell switching from the source cell to the candidate cell, the modified DCI can include a DCI format initiating a physical downlink control channel (PDCCH) order to trigger a random access procedure for the candidate cell.
[0185] In example 14, which can also include one or more of the examples described herein, the instructions can include an indication of the candidate cell, the CSI-RS resources sets for the candidate cell, or the one or more CSI reports for the candidate cell.
[0186] In example 15, which can also include one or more of the examples described herein, the one or more CSI reports are transmitted via a physical uplink shared channel (PUSCH) to the candidate cell indicated in a cell switching command to trigger performing the cell switching from the source cell to the candidate cell.
[0187] In example 16, which can also include one or more of the examples described herein, the one or more CSI reports are transmitted via the PUSCH based on a gap between the one or more CSI-RS resource sets that are used to determine the one or more CSI reports and the PUSCH satisfying a threshold, the threshold corresponding to a processing time of the UE for generating the one or more CSI reports based on the CSI measurement performed on the one or more CSI-RS resource sets associated with the one or more candidate cells.
[0188] In example 17, which can also include one or more of the examples described herein, the one or more CSI reports are transmitted by uplink control information (UCI) using the PUSCH, where the PUSCH is associated with a random access response and a Radio Resource Control (RRC) reconfiguration completion message.
[0189] In example 18, which can also include one or more of the examples described herein, the one or more CSI reports are transmitted by the UCI using the PUSCH, where the PUSCH is scheduled by a Msg2 Medium Access Control Random Access Response based on the UE performing the CSI measurement prior to performing the cell switching from the source cell to the candidate cell.
[0190] In example 19, which can also include one or more of the examples described herein, the PUSCH is a configured grant (CG) PUSCH or a dynamic grant (DG) PUSCH.
[0191] In example 20, which can also include one or more of the examples described herein, the one or more CSI reports are transmitted via a first earliest CG-PUSCH or the DG-PUSCH based on a gap between the one or more CSI-RS resource sets that are used to determine the one or more CSI reports and a second PUSCH satisfying a threshold, the threshold corresponding to processing time of the UE for generating the one or more CSI reports based on CSI measurement performed on the one or more CSI-RS resource sets associated with the one or more candidate cells.
[0192] In example 21, which can also include one or more of the examples described herein, the one or more CSI reports are transmitted via the CG-PUSCH or the DG-PUSCH including a Radio Resource Control (RRC) reconfiguration completion message.
[0193] In example 22, which can also include one or more of the examples described herein, the one or more CSI reports are transmitted via a Medium Access Control (MAC) Control Element (MAC-CE) .
[0194] In example 23, which can also include one or more of the examples described herein, the one or more CSI reports are transmitted by uplink control information (UCI) on a physical layer.
[0195] In example 24, which can also include one or more of the examples described herein, a base station can include one or more processors configured to perform operations including: transmitting instructions, from a source cell to a user equipment (UE) , to initiate a channel state information (CSI) measurement on one or more CSI-reference signal (CSI-RS) resource sets associated with one or more candidate cells; and performing, based on the instructions and as part of a mobility procedure, cell switching of the UE from the source cell to a candidate cell of the one or more candidate cells.
[0196] In example 25, which can also include one or more of the examples described herein, the one or more processors are further configured to perform operations including: configuring the one or more CSI-RS resource sets associated with the one or more candidate cells.
[0197] In example 26, which can also include one or more of the examples described herein, the one or more processors are further configured to perform operations including: transmitting configuration information from the source cell to the UE, the configuration information configuring the UE to support one or more CSI reports associated with the one or more candidate cells, where transmitting the instructions is based on transmitting the configuration information.
[0198] In example 27, which can also include one or more of the examples described herein, the UE is configured to perform a CSI measurement, based on the instructions, on the one or more CSI-RS resource sets to determine CSI associated with the one or more candidate cells.
[0199] In example 28, which can also include one or more of the examples described herein, the UE is configured to transmit, to the candidate cell, one or more CSI reports associated with CSI determined based on the one or more CSI-RS resource sets.
[0200] In example 29, which can also include one or more of the examples described herein, the one or more processors are further configured to perform operations including: transmitting, to the UE, a command triggering the UE to perform the cell switching from the source cell to the candidate cell, where triggering performing the cell switching is based on transmitting the command.
[0201] In example 30, which can also include one or more of the examples described herein, the command can include the instructions to initiate the CSI measurement, and performing the cell switching is based on transmitting the instructions, where the instructions can include repurposed reserved bits in a mobility procedure cell switching command Medium Access Control (MAC) Control Element (MAC-CE) .
[0202] In example 31, which can also include one or more of the examples described herein, transmitting the instructions to initiate the CSI measurement occurs before performing cell switching from the source cell to the candidate cell.
[0203] In example 32, which can also include one or more of the examples described herein, to transmit the instructions to initiate the CSI measurement, the one or more processors are further configured to perform operations including: transmitting a first Medium Access Control (MAC) Control Element (MAC-CE) from the source cell including the instructions to initiate the CSI measurement for the candidate cell before receiving a second MAC-CE triggering performing the cell switching from the source cell to the candidate cell.
[0204] In example 33, which can also include one or more of the examples described herein, the first MAC-CE is introduced before performing the cell switching from the source cell to the candidate cell.
[0205] In example 34, which can also include one or more of the examples described herein, the first MAC-CE can include a modified MAC-CE used before performing the cell switching, the modified MAC-CE can include bits reserved in candidate cell configuration indicator (TCI) states activation or deactivation MAC-CE repurposed to indicate a CSI-RS resource set associated with the candidate cell for performing the CSI measurement.
[0206] In example 35, which can also include one or more of the examples described herein, the first MAC-CE is associated with the candidate cell of the one or more candidate cells, where the instructions to initiate the CSI measurement on one or more CSI-RS resource sets are associated with the candidate cell of the one or more candidate cells.
[0207] In example 36, which can also include one or more of the examples described herein, the first MAC-CE is associated with multiple candidate cells, where the instructions to initiate the CSI measurement on one or more CSI-RS resource sets are associated with the multiple candidate cells.
[0208] In example 37, which can also include one or more of the examples described herein, to transmit the instructions to initiate the CSI measurement, the one or more processors are further configured to perform operations including: transmitting a downlink control information (DCI) format including the instructions.
[0209] In example 38, which can also include one or more of the examples described herein, the DCI format is transmitted from the source cell to initiate the CSI measurement on the candidate cell before performing the cell switching from the source cell to the candidate cell.
[0210] In example 39, which can also include one or more of the examples described herein, the DCI format can include a modified DCI format used before performing the cell switching from the source cell to the candidate cell, the modified DCI can include a DCI format initiating a physical downlink control channel (PDCCH) order to trigger a random access procedure for the candidate cell.
[0211] In example 40, which can also include one or more of the examples described herein, the instructions can include an indication of the candidate cell, the CSI-RS resources sets for the candidate cell, or one or more CSI reports for the candidate cells.
[0212] In example 41, which can also include one or more of the examples described herein, baseband circuitry configured to perform operations including: obtaining instructions, from a source cell, to initiate a channel state information (CSI) measurement on one or more CSI-reference signal (CSI-RS) resource sets associated with one or more candidate cells; performing, based on the instructions, a CSI measurement on the one or more CSI-RS resource sets to determine CSI associated with the one or more candidate cells; performing, based on the instructions and as part of a mobility procedure, cell switching from the source cell to a candidate cell of the one or more candidate cells; generating one or more CSI reports based on the CSI measurement performed on the one or more CSI-RS resource sets; and transmitting, to the candidate cell, the one or more CSI reports.
[0213] The above description of illustrated examples, implementations, aspects, etc., of the subject disclosure, including what is described in the Abstract, is not intended to be exhaustive or to limit the disclosed aspects to the precise forms disclosed. While specific examples, implementations, aspects, etc., are described herein for illustrative purposes, various modifications are possible that are considered within the scope of such examples, implementations, aspects, etc., as those skilled in the relevant art can recognize.
[0214] In this regard, while the disclosed subject matter has been described in connection with various examples, implementations, aspects, etc., and corresponding Figures, where applicable, it is to be understood that other similar aspects can be used or modifications and additions can be made to the disclosed subject matter for performing the same, similar, alternative, or substitute function of the subject matter without deviating therefrom. Therefore, the disclosed subject matter should not be limited to any single example, implementation, or aspect described herein, but rather should be construed in breadth and scope in accordance with the appended claims below.
[0215] In particular regard to the various functions performed by the above described components or structures (assemblies, devices, circuits, systems, etc. ) , the terms (including a reference to a “means” ) used to describe such components are intended to correspond, unless otherwise indicated, to any component or structure which performs the specified function of the described component (e.g., that is functionally equivalent) , even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations. In addition, while a particular feature can have been disclosed with respect to only one of several implementations, such feature can be combined with one or more other features of the other implementations as can be desired and advantageous for any given application.
[0216] As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or” . That is, unless specified otherwise, or clear from context, “X employs A or B” is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then “X employs A or B” is satisfied under any of the foregoing instances. In addition, the articles “a” and “an” as used in this application and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from context to be directed to a singular form. Furthermore, to the extent that the terms “including” , “includes” , “having” , “has” , “with” , or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term “comprising. ” Additionally, in situations wherein one or more numbered items are discussed (e.g., a “first X” , a “second X” , etc. ) , in general the one or more numbered items can be distinct, or they can be the same, although in some situations the context can indicate that they are distinct or that they are the same.
[0217] 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 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 user equipment (UE) comprising one or more processors configured to perform operations comprising:receiving instructions, from a source cell, to initiate a channel state information (CSI) measurement on one or more CSI-reference signal (CSI-RS) resource sets associated with one or more candidate cells;performing, based on the instructions, a CSI measurement on the one or more CSI-RS resource sets to determine CSI associated with the one or more candidate cells;performing, based on the instructions and as part of a mobility procedure, cell switching from the source cell to a candidate cell of the one or more candidate cells;generating one or more CSI reports based on the CSI measurement performed on the one or more CSI-RS resource sets; andtransmitting, to the candidate cell, the one or more CSI reports.2.The UE of claim 1, wherein the one or more processors are further configured to perform operations comprising:receiving configuration information from the source cell, the configuration information configuring the one or more CSI reports associated with the one or more candidate cells to the UE, wherein each CSI report is identified by a CSI report ID, andwherein receiving the instructions is based on receiving the configuration information.3.The UE of claim 1, wherein the one or more processors are further configured to perform operations comprising:receiving a command that is modified based on a mobility procedure cell switch command Medium Access Control (MAC) Control Element (MAC-CE) to trigger performing the cell switching from the source cell to the candidate cell and CSI measurement on the candidate cell, wherein performing the cell switching is based on receiving the command.4.The UE of claim 3, wherein the command comprises the instructions to initiate the CSI measurement on the candidate cell indicated in the command, and the instructions are indicated by a new field based on repurposing reserved bits in a mobility procedure cell switch command MAC-CE.5.The UE of claim 1, wherein to receive the instructions to initiate the CSI measurement before performing the cell switching, the one or more processors are further configured to perform operations comprising:receiving a first Medium Access Control (MAC) Control Element (MAC-CE) from the source cell comprising the instructions to initiate CSI measurement for the candidate cell before receiving a second MAC-CE triggering performing the cell switching from the source cell to the candidate cell.6.The UE of claim 5, wherein the first MAC-CE is identified by a dedicated enhanced Logical Channel identity (eLCID) , and comprises:one or more candidate cell ID fields indicating identities of the one or more candidate cells for which the MAC-CE applies; andone or more aperiodic CSI report ID fields or one or more periodic CSI-RS resource set or semi-persistent CSI-RS resource set ID fields, wherein each field indicates identities of one or more periodic CSI-RS resource sets or semi-persistent CSI-RS resource sets used for CSI computation for the one or more candidate cells comprising the candidate cell.7.The UE of claim 6, wherein the first MAC-CE is associated with the candidate cell of the one or more candidate cells identified by a respective candidate cell ID field of the one or more candidate cell ID fields, and wherein the instructions to initiate the CSI measurement on one or more CSI-RS resource sets indicated by the one or more aperiodic CSI report ID fields or the one or more periodic CSI-RS resource set or semi-persistent CSI-RS resource set ID fields are associated with the candidate cell of the one or more candidate cells.8.The UE of claim 6, wherein the first MAC-CE is associated with multiple candidate cells identified by respective candidate cell ID fields, and wherein the instructions to initiate the CSI measurement on one or more CSI-RS resource sets indicated by the one or more aperiodic CSI report ID fields or the one or more periodic CSI-RS resource set or semi-persistent CSI-RS resource set ID fields are associated with the multiple candidate cells.9.The UE of claim 5, wherein the first MAC-CE comprises a modified MAC-CE used before performing the cell switching, the modified MAC-CE comprising bits reserved in candidate cell configuration indicator (TCI) states activation or deactivation MAC-CE repurposed to indicate a CSI-RS resource set associated with the candidate cell for performing the CSI measurement.10.The UE of claim 1, wherein to receive the instructions to initiate the CSI measurement, the one or more processors are further configured to perform operations comprising:receiving a downlink control information (DCI) format comprising the instructions.11.The UE of claim 10, wherein the DCI format is received from the source cell to initiate the CSI measurement on the candidate cell before performing the cell switching from the source cell to the candidate cell.12.The UE of claim 10, wherein the DCI format comprises a modified DCI format used before performing the cell switching from the source cell to the candidate cell, the modified DCI comprises a DCI format initiating a physical downlink control channel (PDCCH) order to trigger a random access procedure for the candidate cell.13.The UE of claim 1, wherein the one or more CSI reports are transmitted via a physical uplink shared channel (PUSCH) to the candidate cell indicated in a cell switching command to trigger performing the cell switching from the source cell to the candidate cell.14.The UE of claim 13, wherein the one or more CSI reports are transmitted by uplink control information (UCI) using the PUSCH, and wherein the PUSCH is associated with a random access response and a Radio Resource Control (RRC) reconfiguration completion message.15.The UE of claim 14, wherein the PUSCH is a configured grant (CG) PUSCH or a dynamic grant (DG) PUSCH.16.The UE of claim 1, wherein the one or more CSI reports are transmitted via a Medium Access Control (MAC) Control Element (MAC-CE) .17.The UE of claim 1, wherein the one or more CSI reports are transmitted by uplink control information (UCI) on a physical layer.18.A base station comprising one or more processors configured to perform operations comprising:transmitting instructions, from a source cell to a user equipment (UE) , to initiate a channel state information (CSI) measurement on one or more CSI-reference signal (CSI-RS) resource sets associated with one or more candidate cells; andperforming, based on the instructions and as part of a mobility procedure, cell switching of the UE from the source cell to a candidate cell of the one or more candidate cells.19.The base station of claim 18, wherein the one or more processors are further configured to perform operations comprising:configuring the one or more CSI-RS resource sets associated with the one or more candidate cells.20.Baseband circuitry configured to perform operations comprising:obtaining instructions, from a source cell, to initiate a channel state information (CSI) measurement on one or more CSI-reference signal (CSI-RS) resource sets associated with one or more candidate cells;performing, based on the instructions, a CSI measurement on the one or more CSI-RS resource sets to determine CSI associated with the one or more candidate cells;performing, based on the instructions and as part of a mobility procedure, cell switching from the source cell to a candidate cell of the one or more candidate cells;generating one or more CSI reports based on the CSI measurement performed on the one or more CSI-RS resource sets; andtransmitting, to the candidate cell, the one or more CSI reports.