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US-12627370-B2 - NTN-entity, user equipment and base station involved in transmission procedure

US12627370B2US 12627370 B2US12627370 B2US 12627370B2US-12627370-B2

Abstract

The present disclosure relates to an NTN entity comprising the following. A receiver of the NTN entity receives a channel status report from a user equipment, UE, the channel status report providing information on a channel between the UE and the NTN entity. A transmitter of the NTN entity forwards the received channel status report to a base station. The receiver receives scheduling information from the base station regarding a downlink or uplink transmission of the data with for the UE. A processor of the NTN entity determines an updated channel status. The processor determines whether to adapt a transmission power for the downlink or uplink transmission according to the received scheduling information, based on the updated channel status. The processor, when having determined to adapt the transmission power, adapts the transmission power for the downlink or uplink transmission.

Inventors

  • Hamidreza Shariatmadari
  • Hidetoshi Suzuki
  • Quan KUANG
  • Hongchao Li

Assignees

  • PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA

Dates

Publication Date
20260512
Application Date
20211104
Priority Date
20201215

Claims (18)

  1. 1 . A non-terrestrial network (NTN) entity, comprising: a receiver, which, in operation, receives a channel status report from a user equipment (UE), the channel status report providing information on a channel between the UE and the NTN entity; a transmitter, which, in operation, forwards the received channel status report to a base station; wherein the receiver, when in operation, receives scheduling information from the base station regarding a downlink or uplink transmission of data for the UE; and a processor, which, in operation, determines an updated channel status; wherein the processor, in operation, determines whether to adapt a transmission power for the downlink or uplink transmission according to the received scheduling information, based on the updated channel status, wherein the processor, when having determined to adapt the transmission power, adapts the transmission power for the downlink or uplink transmission, wherein adapting the transmission power comprises increasing or decreasing the transmission power, wherein the transmission power is increased, in case the updated channel status indicates a deteriorated channel status than the previous channel status, provided to the base station, and wherein the determination whether to adapt the transmission power for the scheduled downlink or uplink transmission is further based on a minimum transmission-related parameter to be fulfilled for the scheduled transmission.
  2. 2 . The NTN entity according to claim 1 , wherein the scheduling information is for a downlink transmission, and the receiver, when in operation, receives downlink data in association with the downlink scheduling information from the base station, wherein the adaption of the transmission power by the processor comprises adapting the transmission power of the downlink transmission of the received downlink data, and wherein the transmitter, when in operation, performs the downlink transmission of the downlink data to the UE according to the downlink scheduling information and based on the adapted transmission power.
  3. 3 . The NTN entity according to claim 2 , wherein the processor, when in operation, performs, based on the updated channel status, an estimation as to whether or not the scheduled downlink transmission of the downlink data to the UE will be successful, in case the determined estimation is that the scheduled downlink transmission will not be successful, the transmitter transmits a negative acknowledgement for the scheduled downlink transmission to the base station, and wherein the transmitter performs the scheduled downlink transmission of the downlink data to the UE.
  4. 4 . The NTN entity according to claim 3 , wherein the processor, when in operation, determines, based on the determined estimation, whether or not to cancel the scheduled downlink transmission of the downlink data to the UE, and in case it is determined to cancel the scheduled downlink transmission, the scheduled downlink transmission is not performed and the transmission of the negative acknowledgment by the transmitter is performed, in case it is determined not to cancel the scheduled downlink transmission, the scheduled downlink transmission of the downlink data to the UE is performed, and wherein the determination of the processor determines to cancel the scheduled downlink transmission of the downlink data to the UE, in case the UE is out of coverage of the NTN entity, and the transmitter, when in operation, forwards the downlink data to another NTN entity, which is a target of a handover of the UE from the NTN entity to that other NTN entity.
  5. 5 . The NTN entity according to claim 2 , wherein the processor, when in operation, determines a priority associated with the downlink data to be forwarded to the UE, and wherein the determination of whether to adapt the transmission power of the scheduled downlink or uplink transmission takes the priority associated with the downlink data into account, wherein information on the priority associated with the downlink data is included with the data or with the downlink scheduling information regarding the downlink transmission of the downlink data.
  6. 6 . The NTN entity according to claim 1 , wherein the scheduling information is for an uplink transmission, and wherein the adaptation of the transmission power by the processor comprises adapting the transmission power for the uplink transmission of uplink data.
  7. 7 . The NTN entity according to claim 6 , wherein the scheduling information received for the uplink transmission comprises a plurality of different uplink scheduling information, the different uplink scheduling information differing at least among each other in a value of transmission power, wherein the adaption of the transmission power by the processor comprises selecting that uplink scheduling information having the most suitable transmission power, based on the updated channel status, and wherein the transmitter, when in operation, transmits the selected uplink scheduling information to the UE.
  8. 8 . The NTN entity according to claim 6 , wherein the scheduling information received for the uplink transmission indicates a value for a transmission power of the scheduled uplink transmission, wherein the adaptation of the transmission power by the processor comprises adapting the value of the transmission power indicated by the uplink scheduling information to a different value, based on the updated channel status, and wherein the transmitter, when in operation, transmits the uplink scheduling information with the different value of the transmission power to the UE.
  9. 9 . The NTN entity according to claim 6 , wherein the processor, when in operation, performs, based on the updated channel status, an estimation as to whether or not the scheduled uplink transmission of the uplink data by the UE will be successful, in case the determined estimation is that the scheduled uplink transmission will not be successful, the transmitter transmits a negative acknowledgement for the scheduled uplink transmission to the base station, and wherein the transmitter transmits the uplink scheduling information to the UE.
  10. 10 . The NTN entity according to claim 9 , wherein the processor, when in operation, determines, based on the determined estimation, whether or not to cancel the scheduled uplink transmission of the uplink data by the UE, and in case it is determined to cancel the scheduled uplink transmission, the uplink scheduling information is not transmitted to the UE, and in case it is determined not to cancel the scheduled uplink transmission, the uplink scheduling information is transmitted to the UE.
  11. 11 . The NTN entity according to claim 1 , wherein the receiver, when in operation, monitors negative acknowledgments received from the UE regarding previous downlink transmissions from the NTN entity to the UE, wherein the adaptation of the transmission power by the processor takes into account the monitored negative acknowledgments and negative acknowledgements regarding previous uplink transmissions from the UE to the NTN entity, and wherein in case the amount of monitored negative acknowledgements is larger than a negative acknowledgement (NACK) threshold, the adaptation of the transmission power increases the transmission power.
  12. 12 . The NTN entity according to claim 1 , wherein the receiver, when in operation, receives an updated channel status report from the UE, and the determining of the updated channel status by the processor is performed based on the received updated channel status report, and/or wherein the processor estimates the updated channel status from one or more of measurements performed on the channel, feedback for the scheduled downlink transmission, and information on the location of the UE.
  13. 13 . The NTN entity according to claim 12 , wherein the receiver, when in operation, receives a decoded updated channel status report from another NTN entity, having the capability to decode the updated channel status report and having a transmission link to the NTN entity, wherein in case the NTN entity is not capable to decode the updated channel status report, the transmitter, when in operation, forwards the updated channel status report to the other NTN entity, and wherein the transmitter does not forward the updated channel status report to the base station.
  14. 14 . The NTN entity according to claim 12 , wherein the processor, when in operation, determines dedicated uplink radio resources to be assigned to the UE for transmitting the updated channel status report to the NTN entity, wherein the transmitter, when in operation, provides uplink resource information on the determined dedicated uplink radio resources to the UE, wherein the determining of the dedicated uplink radio resources by the processor is performed such that the dedicated uplink radio resources are determined among a pool of uplink radio resources assigned by the base station, and wherein the processor, when in operation, determines dedicated downlink radio resources to be used by the NTN entity to transmit a reference signal to the UE, for use in determining an updated channel status, wherein the determining of the dedicated downlink radio resources by the processor is performed such that the dedicated downlink radio resources are determined among a pool of downlink radio resources assigned by the base station.
  15. 15 . The NTN entity according to claim 12 , wherein the content of the updated channel status report is different from the content of the channel status report, wherein the updated channel status report provides an indication of whether or not the channel status has deteriorated compared to the channel status indicated by the previously-received channel status report, wherein the receiver performs an energy detection for detecting the presence of the updated channel status report, wherein the presence of the updated channel status report indicates a specific condition at the UE, such as a deterioration of the channel status compared to the channel status indicated by the previously-received channel status report or the UE being out of coverage of the NTN entity, and wherein the updated channel status report indicates at least one of a current location of the UE, a current movement direction of the UE, and a speed of the UE.
  16. 16 . A user equipment (UE), comprising: a transmitter, which, in operation, transmits a channel status report to a non-terrestrial network (NTN) entity, the channel status report providing information on a channel between the UE and the NTN entity; a processor, which, in operation, determines an updated channel status of the channel between the UE and the NTN entity; and a receiver, which, in operation, receives, from the NTN entity, uplink scheduling information for an uplink transmission of uplink data from the UE to the NTN entity; wherein the processor, when in operation, determines whether to adapt a transmission power of the uplink transmission of the uplink data, based on the updated channel status, wherein the processor, when having determined to adapt the transmission power, adapts the transmission power, wherein the transmitter, when in operation, performs the uplink transmission of the uplink data to the NTN entity according to the received uplink scheduling information and based on the adapted transmission power, wherein the determination of whether to adapt the transmission power of the scheduled uplink transmission of the uplink data takes into account a priority of the uplink data, and wherein the determining whether to adapt the transmission power for the scheduled uplink transmission is further based on a minimum transmission-related parameter to be fulfilled for the scheduled uplink transmission.
  17. 17 . The UE according to claim 16 , wherein the processor, when in operation, determines, based on the updated channel status, whether or not to cancel the scheduled uplink transmission of the uplink data to the NTN entity, in case it is determined to cancel the scheduled uplink transmission, the scheduled uplink transmission is not performed, and in case it is determined not to cancel the scheduled uplink transmission, the scheduled uplink transmission is performed.
  18. 18 . A base station comprising: a receiver, which, in operation, receives a channel status report from a non-terrestrial network (NTN) entity providing information on a channel between a user equipment (UE) and the NTN entity; a processor, which, in operation, prepares a plurality of different uplink scheduling information for transmission of uplink data by the UE based on the received channel status report, the different uplink scheduling information at least differing among each other in a value of transmission power; a transmitter, which, in operation, transmits the prepared plurality of different uplink scheduling information to the NTN entity, wherein the transmission power of the scheduled uplink transmission of the uplink data is adapted based on a priority of the uplink data, and wherein the transmission power of the scheduled uplink transmission of the uplink data is adapted further based on a minimum transmission-related parameter to be fulfilled for the scheduled uplink transmission.

Description

BACKGROUND Technical Field The present disclosure is directed to methods, devices and articles in communication systems, such as 3GPP communication systems. Description of the Related Art Currently, the 3rd Generation Partnership Project (3GPP) works at the technical specifications for the next generation cellular technology, which is also called fifth generation (5G). One objective is to provide a single technical framework addressing all usage scenarios, requirements and deployment scenarios (see, e.g., section 6 of TR 38.913 version 16.0.0), at least including enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine type communication (mMTC). For example, eMBB deployment scenarios may include indoor hotspot, dense urban, rural, urban macro and high speed; URLLC deployment scenarios may include industrial control systems, mobile health care (remote monitoring, diagnosis and treatment), real time control of vehicles, wide area monitoring and control systems for smart grids; mMTC deployment scenarios may include scenarios with large number of devices with non-time critical data transfers such as smart wearables and sensor networks. The services eMBB and URLLC are similar in that they both demand a very broad bandwidth, however are different in that the URLLC service may preferably require ultra-low latencies. A second objective is to achieve forward compatibility. Backward compatibility to Long Term Evolution (LTE, LTE-A) cellular systems is not required, which facilitates a completely new system design and/or the introduction of novel features. BRIEF SUMMARY One non-limiting and exemplary embodiment facilitates providing procedures for facilitating an NTN entity to participate in the improved transmission procedure. UE to perform. In an embodiment, the techniques disclosed here feature a non-terrestrial network, NTN, entity comprising the following. A receiver of the NTN entity receives a channel status report from a user equipment, UE, the channel status report providing information on a channel between the UE and the NTN entity. A transmitter of the NTN entity forwards the received channel status report to a base station. The receiver receives scheduling information from the base station regarding a downlink or uplink transmission of the data with for the UE. A processor of the NTN entity determines an updated channel status. The processor determines whether to adapt a transmission power for the downlink or uplink transmission according to the received scheduling information, based on the updated channel status. The processor, when having determined to adapt the transmission power, adapts the transmission power for the downlink or uplink transmission. It should be noted that general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof. For instance, an integrated circuit can control a process of a UE or base station. Additional benefits and advantages of the disclosed embodiments and different implementations will be apparent from the specification and figures. The benefits and/or advantages may be individually obtained by the various embodiments and features of the specification and drawings, which need not all be provided in order to obtain one or more of such benefits and/or advantages. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS In the following exemplary embodiments are described in more detail with reference to the attached figures and drawings. FIG. 1 shows an exemplary architecture for a 3GPP NR system; FIG. 2 is a schematic drawing that shows a functional split between NG-RAN and 5GC. FIG. 3 is a sequence diagram for RRC connection setup/reconfiguration procedures. FIG. 4 is a schematic drawing showing usage scenarios of Enhanced mobile broadband (eMBB). Massive Machine Type Communications (mMTC) and Ultra Reliable and Low Latency Communications (URLLC), FIG. 5 is a block diagram showing an exemplary 5G system architecture for a non-roaming scenario, FIG. 6 illustrates an exemplary NG RAN architecture based on a transparent satellite, FIG. 7 illustrates an exemplary NG RAN architecture based on a regenerative satellite. FIG. 8 illustrates an exemplary scenario where several UEs are served by a satellite, FIG. 9 illustrates an exemplary and simplified structure of a UE, gNB, and NTN entity, FIG. 10 illustrates a structure of the NTN entity according to an exemplary implementation of an improved transmission procedure. FIG. 11 is a flow diagram for the NTN entity behavior, according to an exemplary implementation of the improved transmission procedure, FIG. 12 illustrates a structure of the UE according to an exemplary implementation of an improved transmission procedure, FIG. 13 is a flow diagram for the UE behavior, according to an exemplary implementation of the improved transmission procedure. FIG. 14 illustrates a structure o