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EP-4138511-B1 - APPARATUSES AND METHOD FOR UPLINK TRANSMISSION IN A STANDBY STATE

EP4138511B1EP 4138511 B1EP4138511 B1EP 4138511B1EP-4138511-B1

Inventors

  • FUJISHIRO, MASATO

Dates

Publication Date
20260506
Application Date
20190624

Claims (4)

  1. An apparatus (130) for a user equipment (100), the apparatus (130) comprising: a processor and a memory coupled to the processor, wherein the processor is configured to: when the user equipment (100) is in a Radio Resource Control, RRC, connected state, receive from a base station (200), an RRC Release message including information indicating an uplink radio resource used for transmitting uplink data from the user equipment (100) in an RRC inactive state, the RRC Release message including an RNTI, Radio Network Temporary Identifier, in response to receiving the RRC Release message, control the user equipment (100) to transition from the RRC connected state to the RRC inactive state and to hold the RNTI, and transmit the uplink data by using the RNTI and the uplink radio resource indicated by the information included in the RRC Release message when the user equipment (100) is in the RRC inactive state.
  2. A user equipment (100) comprising the apparatus (130) according to claim 1.
  3. A method used for a user equipment (100), comprising: when the user equipment (100) is in a Radio Resource Control, RRC, connected state, receiving from a base station (200), an RRC Release message including information indicating an uplink radio resource used for transmitting uplink data from the user equipment (100) in an RRC inactive state, the RRC Release message including an RNTI, Radio Network Temporary Identifier; in response to receiving the RRC Release message, transitioning from the RRC connected state to the RRC inactive state and holding (S202) the RNTI; and transmitting the uplink data by using the RNTI and the uplink radio resource indicated by the information included in the RRC Release message when the user equipment (100) is in the RRC inactive state.
  4. A base station (200) comprising: a transmitter (210) configured to transmit to a user equipment (100) in a Radio Resource Control, RRC, connected state, an RRC Release message including information indicating an uplink radio resource used for transmitting uplink data from the user equipment (100) in an RRC inactive state, the RRC Release message including an RNTI, Radio Network Temporary Identifier, a controller (230) configured to hold the RNTI, and a receiver (220) configured to receive from the user equipment (100) in the RRC inactive state, the uplink data transmitted by using the RNTI and the uplink radio resource indicated by the information included in the RRC Release message.

Description

TECHNICAL FIELD The present invention relates to an apparatus provided in a user equipment, a user equipment, a method used for a user equipment and a base station. BACKGROUND ART In a mobile communication system conforming to the 3GPP (3rd Generation Partnership Project) standard, a radio terminal performs a random access procedure as a procedure to transition from a standby state called an RRC idle mode to a connected state called an RRC connected mode. After transitioning to the connected state through the random access procedure, the radio terminal transmits and receives user data to/from a base station. As a technique for machine type communication, early data transmission has been introduced, in which user data is transmitted and received during the random access procedure. With the early data transmission, the radio terminal transmits uplink data to the base station using a message3 (Msg3) of the random access procedure and completes the random access procedure without transitioning to a connected state, thus enabling data transmission with low power consumption. In order to further reduce signaling between the base station and the radio terminal, a technique eliminating the need for message1 (Msg1) and message2 (Msg2) in the random access procedure has been proposed (see Non Patent Literature 1). Msg1 is a random access signal (random access preamble) transmitted from the radio terminal to the base station, while Msg2 is a random access response transmitted from the base station to the radio terminal. In that novel technique, the radio terminal would start the random access procedure with the transmission of Msg3. WO 2017/052320 A1 discloses a method for transmitting uplink data in a wireless communication system, the method carried out by a terminal comprising the steps of: establishing synchronization with a base station; receiving, from the base station, control information associated with a contention-based uplink data transmission resource area; notifying the base station of the size of the uplink data to be transmitted; transmitting the uplink data to the base station by means of the contention-based uplink data transmission resource area.ZTE: "Remaining issues for EDT", 3GPP DRAFT; R2-1712982 REMAINING ISSUES FOR EDT, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE; XP051371827 discloses aspects related to remaining issues for EDT."3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 15)", 3GPP DRAFT; DRAFT_36300-F20, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE; XP051472773 discloses aspects related to Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN)."3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (Release 15)", 3GPP DRAFT; RDRAFT 36331-FXO P5 (6.3.6-6.6)_V02, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE; XP051545593 discloses aspects related to Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC).SAMSUNG: "Discussion on NoMA related procedure", 3GPP DRAFT; Rl-1806753, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE; XP051441955 discloses aspects related to NoMA related procedure. Citation List Non Patent Literature Non Patent Literature 1: 3GPP Contribution, "RP-181186", "Scope of Rel-16 LTE-MTC", [online], [searched on June 18, 2018], the Internet <http://www.3gpp.org/ftp/tsg_Ran/tsg_Ran/TSGR_80/Docs/RP-181186.zip> SUMMARY OF INVENTION The invention provides an apparatus provided in a user equipment according to claim 1, a user equipment according to claim 2, a method used for a user equipment according to claim 3, and a base station according to claim 4. BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is a diagram illustrating a configuration of an mobile communications system according to an embodiment.Fig. 2 is a diagram illustrating a configuration of a UE (radio terminal) according to the embodiment.Fig. 3 is a diagram illustrating a configuration of an eNB (base station) according to the embodiment.Fig. 4 is a diagram illustrating a protocol stack of a radio interface according to the embodiment.Fig. 5 is diagram illustrating a configuration of a radio frame according to the embodiment.Fig. 6 is a diagram illustrating a frequency channel handled by an eMTC UE and an NB-IoT UE.Fig. 7 is a diagram illustrating a general random acc