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KR-20260065834-A - Beam management in mobility

KR20260065834AKR 20260065834 AKR20260065834 AKR 20260065834AKR-20260065834-A

Abstract

A wireless device may receive various control messages from a base station for cell switching. These control messages indicate timing information and can be configured to cause the wireless device to switch from a source cell to a target cell. If timing information is not indicated, the wireless device may measure the timing information and/or skip the random access procedure to the target cell.

Inventors

  • 지리크 알리 자가타이
  • 디난 에스마엘 헤자지
  • 저우 후아

Assignees

  • 콤캐스트 케이블 커뮤니케이션스 엘엘씨

Dates

Publication Date
20260511
Application Date
20240807
Priority Date
20230807

Claims (15)

  1. As a method, A step in which a wireless device receives one or more configuration parameters, including a timing advance parameter configured to enable a timing advance measurement by the wireless device of a Layer 1 or Layer 2 triggered mobility (LTM) candidate cell; Receiving an LTM cell switching command including an indication that valid timing adjustment is not available for the timing advance group of the LTM candidate cell; and A method comprising the step of skipping a random access procedure for LTM cell switching based on one or more configuration parameters, including a timing advance parameter configured to enable the timing advance measurement by the wireless device of the LTM candidate cell.
  2. A method according to claim 1, further comprising the step of switching to the LTM candidate cell, wherein the LTM cell switching command indicates that the wireless device switches from the serving cell to the LTM candidate cell.
  3. A method according to claim 1 or 2, wherein the LTM cell switching command includes a timing advance command value, and the timing advance command value is set to a predefined value, thereby indicating that a valid timing adjustment is not available to the timing advance group of the LTM candidate cell.
  4. A method according to any one of claims 1 to 3, wherein the predefined value is a hexadecimal value corresponding to FFF.
  5. A method according to any one of claims 1 to 4, wherein the step of receiving an LTM cell switching command includes the step of receiving an LTM cell switching command media access control (MAC) control element (CE).
  6. A method according to any one of claims 1 to 5, further comprising the step of performing the LTM cell switching and the step of applying a timing advance value based on one or more measurements by the wireless device.
  7. A method according to any one of claims 1 to 6, wherein the step of skipping the random access procedure for the LTM cell switching is further based on the LTM cell switching command including an indication that value timing adjustment is not available for the timing advance group of the LTM candidate cell.
  8. In any one of claims 1 to 7, the step of skipping the random access procedure is: A step of deciding not to initiate the random access procedure for the above LTM cell switching; or A method comprising the step of deciding not to transmit a random access preamble for the above LTM cell switching.
  9. A method comprising, in any one of claims 1 to 8, further including the step of transmitting a wireless device capability message to a base station indicating support for the timing advance measurement of the LTM candidate cell by the wireless device.
  10. A method comprising, in any one of claims 1 to 9, a step of determining the timing advance of the LTM candidate cell.
  11. In any one of claims 1 to 10, the step of determining the timing advance of the LTM candidate cell is: Timing advance value of the serving cell; and A method based on the difference in received reference signal timing between the serving cell and the LTM candidate cell.
  12. A method according to any one of claims 1 to 11, further comprising the step of the MAC layer of the wireless device indicating to the wireless resource control layer of the wireless device to skip the random access procedure for the LTM cell switching.
  13. As a wireless device, One or more processors; and A wireless device comprising a memory for storing instructions, wherein the instructions, when executed by one or more processors, cause the wireless device to perform the method of any one of claims 1 to 12.
  14. As a system, A wireless device configured to perform the method of any one of claims 1 to 12; and A system comprising a base station configured to transmit one or more of the above configuration parameters.
  15. A computer-readable medium, which stores instructions that, when executed, cause the method of any one of claims 1 through 12 to be performed.

Description

Skip of random access procedure for LTM cell switch Cross-reference of related applications This application claims the benefit of U.S. Provisional Patent Application No. 63/531,094 filed on August 7, 2023. The aforementioned application is hereby incorporated herein by reference in its entirety. The wireless device communicates with the base station. The wireless device receives configuration parameters for communicating through the cell. The configuration parameters include timing information. The following 'Description of the Invention' presents a simplified summary of specific features. The 'Description of the Invention' is not a broad overview and is not intended to identify key or important elements. A wireless device may receive multiple control messages from a base station. Among these control messages, one or more parameters allow the wireless device to measure timing information (e.g., timing advance value) for a target cell rather than relying on timing information provided by the base station. The measured timing information can be used to improve the synchronization and/or efficiency of handovers between cells. Control messages, such as cell switching commands, can be used to configure the wireless device to transition from a source cell to a target cell. If the cell switching command does not indicate timing information, the wireless device may independently measure the timing information of the target cell. The wireless device may use the measured timing information instead of performing a random access procedure to obtain timing information, which can provide benefits such as reducing latency and/or increasing the efficiency of transitions between the base station and/or cells. These and other features and advantages will be described in more detail later. Some examples of various embodiments of the present disclosure are described herein with reference to the drawings. Figures 1a and 1b show exemplary communication networks. FIG. 2a illustrates an exemplary user plane. FIG. 2b illustrates an exemplary control plane configuration. Figure 3 illustrates an example of a protocol layer. Figure 4a illustrates an exemplary downlink data flow for a user plane configuration. FIG. 4b illustrates an exemplary format of a MAC subheader in a Media Access Control (MAC) protocol data unit (PDU). Figure 5a illustrates an exemplary mapping for a downlink channel. Figure 5b illustrates an exemplary mapping for an uplink channel. FIG. 6 illustrates exemplary wireless resource control (RRC) states and RRC state transitions. Figure 7 illustrates an exemplary configuration of a frame. FIG. 8 illustrates an exemplary resource configuration of one or more carriers. FIG. 9 illustrates an exemplary configuration of a bandwidth portion (BWP). FIG. 10a illustrates an exemplary carrier assembly configuration based on a component carrier. Figure 10b illustrates an exemplary group of cells. FIG. 11a illustrates an exemplary mapping of one or more synchronization signal/physical broadcast channel (SS/PBCH) blocks. FIG. 11b illustrates an exemplary mapping of one or more channel state information reference signals (CSI-RS). Figure 12a illustrates an example of a downlink beam management procedure. Figure 12b illustrates an example of an uplink beam management procedure. FIG. 13a illustrates an exemplary four-step random access procedure. FIG. 13b illustrates an exemplary two-step random access procedure. FIG. 13c illustrates an exemplary two-step random access procedure. FIG. 14a illustrates an example of a control resource set (CORESET) configuration. FIG. 14b illustrates an example of a control channel element to resource element group (CCE-to-REG) mapping. Figure 15a shows an example of communication between a wireless device and a base station. FIG. 15b shows an exemplary element of a computing device that can be used to implement any of the various devices described herein. FIGS. 16a, FIGS. 16b, FIGS. 16c, and FIGS. 16d show examples of uplink and downlink signal transmission. Figure 17 shows an example of a Layer 1 (L1) or Layer 2 (L2) triggered mobility (LTM) procedure. Figure 18 shows an example of cell switching. Figure 19 shows an example of cell switching. Figure 20 shows an example of cell switching. The attached drawings and descriptions are for illustrative purposes only. It should be understood that the examples shown in the drawings and/or described are non-exclusive, and that the features shown and described may be implemented in other examples. An example of the operation of a wireless communication system is provided. FIG. 1a illustrates an exemplary communication network (100). The communication network (100) may include a mobile communication network. The communication network (100) may include, for example, a public terrestrial mobile network (PLMN) operated/managed/executed by a network operator. The communication network (100) may include one or more of a core network (CN) (102), a radio access netw