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EP-4742816-A1 - SATELLITE COVERAGE ENHANCEMENTS

EP4742816A1EP 4742816 A1EP4742816 A1EP 4742816A1EP-4742816-A1

Abstract

A wireless device may communicate with a base station in a terrestrial or non-terrestrial network. One or more system information block messages may indicate multiple random access resource sets of a synchronization signal block. Each resource may correspond to a different type of random access procedure, such as a 2-step or 4-step procedure. A transmit power pattern of the synchronization signal block may indicate a random access resource set to be used.

Inventors

  • SIVAVAKEESAR, SIVAPATHALINGHAM
  • PARK, KYUNGMIN
  • CHUN, SUNGDUCK
  • Dinan, Esmael Hejazi
  • DASHTAKI, MOHAMMAD GHADIR KHOSHKHOLGH
  • PRASAD, Gautham
  • KAZMI, MUHAMMAD ALI
  • ZHOU, HUA
  • XU, JIAN
  • RYU, Jinsook

Assignees

  • Comcast Cable Communications, LLC

Dates

Publication Date
20260513
Application Date
20251107

Claims (15)

  1. A method comprising: receiving, by a wireless device, one or more system information block messages indicating: a first group of random access resources, of a synchronization signal block, that are configured for a first type of random access procedure; and a second group of random access resources, of the synchronization signal block, that are configured for a second type of random access procedure; receiving an indication of a transmit power pattern of the synchronization signal block; based on the transmit power pattern of the synchronization signal block indicating to use a second type of random access procedure, selecting at least one random access resource of the first group of random access resources for use in the second type of random access procedure; and transmitting, via the at least one random access resource, a random access preamble for the second type of random access procedure.
  2. The method of claim 1, further comprising: receiving, by the wireless device, a second system information block message indicating a power threshold and a power offset associated with at least one synchronization signal block; and wherein the selecting of at least one random access resource of the first group for use in the second type of random access procedure is based on a comparison of: a reference signal received power of the synchronization signal block; the power offset corresponding to the synchronization signal block; and the power threshold.
  3. The method of claim 1 or claim 2, wherein the receiving the indication of the transmit power pattern of the synchronization signal block further comprises receiving a transmission power configuration of the synchronization signal block in a time domain, and wherein the selecting the at least one random access resource is further based on the transmission power configuration of the synchronization signal block in the time domain.
  4. The method of any one of claims 1 to 3, wherein the first type of random access procedure is a 2-step random access procedure, and wherein the second type of random access procedure is a 4-step random access procedure.
  5. The method of any one of claims 1 to 4, further comprising: receiving, by the wireless device, a further indication from a network node; and wherein the selecting of at least one random access resource for use in the second type of random access procedure is further based on the further indication.
  6. The method of any one of claims 1 to 5, wherein the synchronization signal block is associated with a single geographical area, and wherein the method further comprises receiving the synchronization signal block during an enabled state.
  7. The method of any one of claims 1 to 6, further comprising: based on the indication of the transmit power pattern of the synchronization signal block, controlling at least one timer for radio link monitoring or beam failure detection.
  8. The method of any one of claims 1 to 7, wherein receiving the indication of the transmit power pattern of the synchronization signal block comprises receiving the indication via at least one of: a system information block; a signal via a physical downlink control channel; downlink control information via a physical downlink control channel; a short message via a physical downlink control channel; a signal via a physical downlink shared channel; or a medium access control control element via a physical downlink shared channel.
  9. The method of any one of claims 1 to 8, wherein a first system information block message further indicates, for the synchronization signal block, a time-domain transmit power configuration, and wherein the method further comprises selecting a random access resource from the first group of random access resources or the second group of random access resources based on a transmit power indicated in the time-domain transmit power configuration.
  10. The method of any one of claims 1 to 9, wherein the synchronization signal block is associated with one or more operational states comprising at least one of: an off state; a state associated with at least one of a common message or common control signaling; or an active traffic state.
  11. The method of any one of claims 2 to 10, wherein the power threshold is a first power threshold, and wherein the method further comprises: determining a second power threshold by scaling the first power threshold with a power offset corresponding to the synchronization signal block; and determining whether to use the 2-step random access procedure or the 4-step random access procedure based on a comparison of the second power threshold with a reference signal received power of the synchronization signal block.
  12. The method of any one of claims 1 to 11, further comprising determining, by the wireless device, a timing offset for selection of the random access resource based on at least one of: a transmit power pattern of the synchronization signal block; or a variation in the reference signal received power over time.
  13. A computing device comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the computing device to perform the method of any one of claims 1 to 12.
  14. A system comprising: a wireless device configured to perform the method of any one of claims 1 to 12; and a base station configured to transmit an indication of a transmit power pattern of a synchronization signal block.
  15. A computer-readable medium storing instructions that, when executed, cause performance of the method of any one of claims 1 to 12.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Application No. 63/718,394 filed on November 8, 2024. The above-referenced application is hereby incorporated by reference in its entirety. BACKGROUND A wireless device communicates with a base station. The wireless device receives configuration parameters for communicating with the base station via a cell. SUMMARY The following summary presents a simplified summary of certain features. The summary is not an extensive overview and is not intended to identify key or critical elements. A wireless device may communicate with a base station. A synchronization signal block may be used to configure wireless communications. Variations in a transmit power or power pattern of the synchronization signal block may affect how a device selects between different types of random access resources, such as those used for 2-step and 4-step random access procedures. In both terrestrial and non-terrestrial networks (e.g., satellite systems), a base station may broadcast system information blocks that associate multiple random access resource sets with a given synchronization signal block or transmit power pattern. By aligning the transmit power configuration with these resource sets, the base station can influence device behavior to balance energy use, coverage, and access reliability. This coordination allows wireless devices to determine suitable random access resources and improve overall connection success even as synchronization signal block transmission power is dynamically varied across beams or cells. These and other features and advantages are described in greater detail below. BRIEF DESCRIPTION OF THE DRAWINGS Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings. FIG. 1A and FIG. 1B show example communication networks.FIG. 2A shows an example user plane.FIG. 2B shows an example control plane configuration.FIG. 3 shows example of protocol layers.FIG. 4A shows an example downlink data flow for a user plane configuration.FIG. 4B shows an example format of a Medium Access Control (MAC) subheader in a MAC Protocol Data Unit (PDU).FIG. 5A shows an example mapping for downlink channels.FIG. 5B shows an example mapping for uplink channels.FIG. 6 shows example radio resource control (RRC) states and RRC state transitions.FIG. 7 shows an example configuration of a frame.FIG. 8 shows an example resource configuration of one or more carriers.FIG. 9 shows an example configuration of bandwidth parts (BWPs).FIG. 10A shows example carrier aggregation configurations based on component carriers.FIG. 10B shows example group of cells.FIG. 11A shows an example mapping of one or more synchronization signal/physical broadcast channel (SS/PBCH) blocks.FIG. 11B shows an example mapping of one or more channel state information reference signals (CSI-RSs).FIG. 12A shows examples of downlink beam management procedures.FIG. 12B shows examples of uplink beam management procedures.FIG. 13A shows an example four-step random access procedure.FIG. 13B shows an example two-step random access procedure.FIG. 13C shows an example two-step random access procedure.FIG. 14A shows an example of control resource set (CORESET) configurations.FIG. 14B shows an example of a control channel element to resource element group (CCE-to-REG) mapping.FIG. 15A shows an example of communications between a wireless device and a base station.FIG. 15B shows example elements of a computing device that may be used to implement any of the various devices described hereinFIG. 16A, FIG. 16B, FIG. 16C, and FIG. 16D show examples of uplink and downlink signal transmission.FIG. 17A, FIG. 17B, FIG. 17C, and FIG. 17D shows one or more interface management procedures taking place between any two nodes.FIG. 18A, FIG. 18B, FIG. 18C, and FIG. 18D shows procedure and the purpose of the next generation setup procedure.FIG. 19 shows one or more configuration parameters making up a system information block 1.FIG. 20 shows one or more configuration parameters making up a system information block 19.FIG. 21A and FIG. 21B show a network providing access to one or more wireless devices.FIG. 22 shows an example of a base station operating one or more beams under severe energy constraints.FIG. 23 shows an example of an SSB transmission by a base station in a cell.FIG. 24 shows an example of a base station not dynamically changing a transmission power of one or more synchronization signal blocks to save energy.FIG. 25 shows an example where a base station operates under energy constraints.FIG. 26A and FIG. 26B show SSB transmission power configuration in the time-domain.FIG. 27 shows an example where a base station operates under energy constraints.FIG. 28 shows an example where a base station may dynamically change SSB transmission powers due to an energy-constrained operation.FIG. 29A and FIG. 29B show an example where a base stati