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BR-112020020057-B1 - USER EQUIPMENT

BR112020020057B1BR 112020020057 B1BR112020020057 B1BR 112020020057B1BR-112020020057-B1

Abstract

TERMINAL, RESPONSE RECEPTION METHOD EXECUTED BY A TERMINAL AND BASE STATION. User equipment that includes a receiving unit that receives control information from a base station, such as a trigger to initiate a random access procedure; a transmitting unit that selects a resource to transmit a random access signal, and transmits the random access signal to the base station using the resource, wherein the receiving unit monitors a response to the random access signal using a resource dedicated to the random access procedure based on the trigger.

Inventors

  • Tomoya OHARA
  • Hiroki Harada

Assignees

  • NTT DOCOMO, INC

Dates

Publication Date
20260317
Application Date
20180405

Claims (5)

  1. 1. Terminal (10) characterized in that it comprises: a receiving unit (120) configured to receive control information that is a trigger to initiate a random access procedure; a control unit (130) configured to select an occasion to transmit a random access preamble; and a transmitting unit (110) configured to transmit the random access preamble using the occasion; wherein the receiving unit (120) is configured to receive a response to the random access preamble using a feature to monitor control information to receive the response to the random access preamble, assuming quasi colocalization unrelated to quasi colocalization that is associated with the feature to monitor the control information.
  2. 2. Terminal (10), according to claim 1, characterized in that the control unit (130) is configured to select a synchronization signal block and select the occasion corresponding to the synchronization signal block, and the receiving unit (120) is configured to assume quasi-colocation with the synchronization signal block when it receives the response.
  3. 3. Terminal (10), according to claim 2, characterized in that the synchronization signal block is associated with a beam.
  4. 4. Response reception method executed by a terminal characterized in that it comprises: receiving (S102, S203, S302) control information that is a trigger to initiate a random access procedure; selecting (S103, S204, S303) an occasion to transmit a random access preamble; transmitting (S104, S205, S304) the random access preamble using the occasion; and receiving (S105, S206, S305) a response to the random access preamble using a feature to monitor control information to receive the response to the random access preamble, assuming quasi-colocation unrelated to the quasi-colocation that is associated with the feature to monitor the control information.
  5. 5. Base station (20) characterized in that it comprises: a transmitting unit (210) configured to transmit control information which is a trigger to initiate a random access procedure; and a receiving unit (220) configured to receive a transmitted random access preamble using an occasion to transmit the randomly access preamble that is selected; wherein the transmitting unit (210) is configured to transmit a response to the random access preamble using a feature to monitor control information to transmit the response to the random access preamble, assuming quasi colocalization unrelated to quasi colocalization which is associated with the feature to monitor the control information.

Description

FIELD OF TECHNIQUE [001] The present invention relates to user equipment for a wireless communication system. BACKGROUND OF THE TECHNIQUE [002] The 3GPP (3rd Generation Partnership Project) is discussing a wireless communication method called NR (New Radio) or 5G in order to achieve further increases in system capacity, further increases in data transmission speed, and further decreases in latency in radio sections (see Non-Patent Document 1, for example). For NR, several radio technologies are discussed to satisfy a certain requirement, namely, a data transfer rate of 10 Gbps or more and a radio section latency of 1 ms or less. [003] It is anticipated that, in NR, a wide frequency range in the range of a low frequency band as low as LTE up to a higher frequency band than LTE. In particular, the application of beamforming with a higher beam gain is discussed in order to compensate for the increase in transmission loss in a higher frequency band. When transmitting a signal using beamforming, a base station or user equipment can determine the direction of a transmitted beam so that it results in better reception quality on a counterparty of the communication.RELATED ART DOCUMENTSNon-Patent DocumentNon-Patent Document 1: 3GPP TS 38.300 v15.0.0 (2017-12) SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION [004] It is anticipated that, in NR, a random access procedure similar to that in LTE will be employed. A problem may exist in which user equipment may fail to receive a random access response in an appropriate manner if the beamforming mentioned above is applied. [005] In view of the problem discussed above, an objective of the present invention is to provide a technique that enables a user device to receive a random access response in an appropriate manner in a wireless communication system in which beamforming is implemented. WAYS TO SOLVE THE PROBLEM [006] According to a disclosed technique, user equipment is provided, which comprises a receiving unit that receives, from a base station, control information such as a trigger to initiate a random access procedure; a transmitting unit that selects a resource to transmit a random access signal, and transmits, to the base station, the random access signal using the resource, wherein the receiving unit monitors a response to the random access signal using a resource dedicated to the random access procedure based on the trigger. EFFECT OF THE INVENTION [007] The disclosed technique enables the user equipment to receive the random access response in an appropriate manner in the wireless communication system in which beamforming is implemented. BRIEF DESCRIPTION OF THE DRAWINGS [008] Figure 1 is a schematic drawing showing a communication system according to a modality; Figure 2 is a schematic drawing showing an example of a random access procedure; Figure 3 is a schematic drawing showing the relationship between beams and RACH; Figure 4 is a schematic drawing showing an example of beam management; Figure 5 is a schematic drawing to explain CORESET; Figure 6 is a schematic drawing to explain the sequence of an exemplary operation 1; Figure 7 is a schematic drawing to explain the sequence of an exemplary operation 2; Figure 8 is a schematic drawing to explain the sequence of an exemplary operation 3; Figure 9 is a schematic drawing to explain exemplary processing associated with the bandwidth part; Figure 10 is a block diagram showing an exemplary functional structure of user equipment 10; Figure 11 is a block diagram showing a structure Figure 12 is a block diagram showing a hardware structure of user equipment 10 and base station 20. (Example functional diagram of base station 20; and Figure 12 is a block diagram showing a hardware structure of user equipment 10 and base station 20.) METHODS FOR CARRYING OUT THE INVENTION [009] The embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments below are illustrative, and the present invention may be applicable to other embodiments not described below. [010] It is assumed that a wireless communication system, according to the modality described below, is basically compatible with NR, which is an example. The wireless communication system, according to the modality, may be compatible, in a total or partial way, with a wireless communication system (LTE, for example). [011] In addition, in the following description, user equipment 10 must monitor Msg2 with a search space as a resource to which a given CORESET has been applied, which is an example. User equipment 10 may monitor Msg2 with a resource other than the search space to which a given CORESET has been applied. [012] In the following description, when Msg2 and SSB have a QCL relationship, PDSCH carrying actual information from Msg2 and SSB may have the QCL relationship, or PDCCH scheduling Msg2 and SSB may have the QCL relationship, or it may be both. (entire system configuration) [013] Figure 1