WO2021170907A1 - Procédé, appareil et programme informatique - Google Patents

Procédé, appareil et programme informatique Download PDF

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Publication number
WO2021170907A1
WO2021170907A1 PCT/FI2021/050112 FI2021050112W WO2021170907A1 WO 2021170907 A1 WO2021170907 A1 WO 2021170907A1 FI 2021050112 W FI2021050112 W FI 2021050112W WO 2021170907 A1 WO2021170907 A1 WO 2021170907A1
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WO
WIPO (PCT)
Prior art keywords
random access
network
access channel
channel procedure
procedure
Prior art date
Application number
PCT/FI2021/050112
Other languages
English (en)
Inventor
Nuno Manuel KIILERICH PRATAS
Faranaz SABOURI-SICHANI
Frank Frederiksen
Thomas Haaning JACOBSEN
Knud Knudsen
Original Assignee
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Publication of WO2021170907A1 publication Critical patent/WO2021170907A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present application relates to a method, apparatus, and computer program.
  • a communication system can be seen as a facility that enables communication sessions between two or more entities such as user terminals, base stations/access points and/or other nodes by providing carriers between the various entities involved in the communications path.
  • a communication system can be provided, for example, by means of a communication network and one or more compatible communication devices.
  • the communication sessions may comprise, for example, communication of data for carrying communications such as voice, electronic mail (email), text message, multimedia and/or content data and so on.
  • Non-limiting examples of services provided comprise two-way or multi way calls, data communication or multimedia services and access to a data network system, such as the Internet.
  • an apparatus comprising means for: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the means for transmitting, for the second random access channel procedure with the second network, the second random access preamble may occur during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the means for transmitting, for the second random access channel procedure with the second network, the second random access preamble may occur during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the means may be for: determining whether a first response message is received from the first network; and in response to determining that the first response message is not received, transmitting the second random access preamble during the time period that the transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the means may be for: in response to the determining that the first response message is not received, terminating the first random access channel procedure if a predetermined amount of re-attempts have occurred.
  • the means may be for in response to determining that the first response message is received, processing the first response message from the first network.
  • the means may be for transmitting a small data transmission to the first network.
  • the means may be for transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the means for transmitting, for the first random access channel procedure with the first network, the first random access preamble may be an initial transmitting of the first random access preamble.
  • the means for transmitting, for the first random access channel procedure with the first network, the first random access preamble may be a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the means for transmitting, for the first random access channel procedure with the first network, the first random access preamble may comprise transmitting a Msg 1 or a Msg A.
  • the means may be for receiving an acknowledgment message from the first network.
  • the means may be for when the acknowledgement message comprises an indication of successful contention resolution, performing one of: terminating the first random access procedure and the second random access channel procedure, and transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of the apparatus.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the means may be for when the acknowledgement message comprises an indication of unsuccessful contention resolution, retransmitting, for the first random access channel procedure, the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the means may be for operating a first subscriber identity module to implement the first random access channel procedure, and a second subscriber identity module to implement the second random access channel procedure.
  • the means may be for operating the first subscriber identity module in a receive mode and may be capable of operating the second subscriber identity module in a receive mode simultaneously.
  • the means for transmitting, for the second random access channel procedure with the second network, the second random access preamble may be while the first random access channel procedure is ongoing.
  • the apparatus may be comprised within a terminal.
  • an apparatus comprising means for: receiving, for a first random access channel procedure with a first network, a first random access preamble; and receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the means for receiving, for the second random access channel procedure with the second network, the second random access preamble may occur during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the means for receiving, for the second random access channel procedure with the second network, the second random access preamble may occur during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the means may be for receiving a small data transmission for the first network.
  • the means may be for receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the means for receiving, for the first random access channel procedure with the first network, the first random access preamble may be an initial reception of the first random access preamble.
  • the means for receiving, for the first random access channel procedure with the first network, the first random access preamble may be a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the means for receiving, for the first random access channel procedure with the first network, the first random access preamble may comprise receiving a Msg 1 or a Msg A.
  • the means may be for transmitting an acknowledgment message from the first network.
  • the means may be for, when the acknowledgement message comprises an indication of successful contention resolution, causing one of: termination of the first random access procedure and the second random access channel procedure, and receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of a terminal.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the means may be for, when the acknowledgement message comprises an indication of unsuccessful contention resolution, receiving, for the first random access channel procedure, a re-transmission of the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the means may be for receiving, for the second random access channel procedure with the second network, the second random access preamble while the first random access channel procedure is ongoing.
  • the apparatus may be comprised within a base station.
  • a system comprising means for: receiving, for a first random access channel procedure with a first network, a first random access preamble at a first apparatus; and receiving, for a second random access channel procedure with a second network, a second random access preamble at a second apparatus, prior to the first apparatus transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to the first apparatus failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the means for receiving, for the second random access channel procedure with the second network, the second random access preamble may occur during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the means for receiving, for the second random access channel procedure with the second network, the second random access preamble may occur during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the means may be for receiving a small data transmission for the first network at the first apparatus.
  • the means may be for receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the means for receiving, for the first random access channel procedure with the first network, the first random access preamble may be an initial reception of the first random access preamble.
  • the means for receiving, for the first random access channel procedure with the first network, the first random access preamble may be a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the means for receiving, for the first random access channel procedure with the first network, the first random access preamble may comprise receiving a Msg 1 or a Msg A.
  • the means may be for transmitting, from the first apparatus, an acknowledgment message from the first network.
  • the means may be for, when the acknowledgement message comprises an indication of successful contention resolution, causing one of: termination of the first random access procedure and the second random access channel procedure, and receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of a terminal.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the means may be for, when the acknowledgement message comprises an indication of unsuccessful contention resolution, receiving, for the first random access channel procedure, a re-transmission of the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the means may be for receiving, for the second random access channel procedure with the second network, the second random access preamble while the first random access channel procedure is ongoing.
  • the first apparatus may be comprised within a base station.
  • the second apparatus may be comprised within a base station.
  • an apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform:
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for the second random access channel procedure with the second network, the second random access preamble may occur during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for the second random access channel procedure with the second network, the second random access preamble may occur during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: determining whether a first response message is received from the first network; and in response to determining that the first response message is not received, transmitting the second random access preamble during the time period that the transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: in response to the determining that the first response message is not received, terminating the first random access channel procedure if a predetermined amount of re-attempts have occurred.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: in response to determining that the first response message is received, processing the first response message from the first network.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting a small data transmission to the first network.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for the first random access channel procedure with the first network, the first random access preamble may be an initial transmitting of the first random access preamble.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for the first random access channel procedure with the first network, the first random access preamble may be a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for the first random access channel procedure with the first network, the first random access preamble may comprise transmitting a Msg 1 or a Msg A.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving an acknowledgment message from the first network.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: when the acknowledgement message comprises an indication of successful contention resolution, performing one of: terminating the first random access procedure and the second random access channel procedure, and transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of the apparatus.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: when the acknowledgement message comprises an indication of unsuccessful contention resolution, retransmitting, for the first random access channel procedure, the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: operating a first subscriber identity module to implement the first random access channel procedure, and a second subscriber identity module to implement the second random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: operating the first subscriber identity module in a receive mode and may be capable of operating the second subscriber identity module in a receive mode simultaneously.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for the second random access channel procedure with the second network, the second random access preamble may be while the first random access channel procedure is ongoing.
  • the apparatus may be comprised within a terminal.
  • an apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for a first random access channel procedure with a first network, a first random access preamble; and receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the second random access channel procedure with the second network, the second random access preamble may occur during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the second random access channel procedure with the second network, the second random access preamble may occur during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving a small data transmission for the first network.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the first random access channel procedure with the first network, the first random access preamble may be an initial reception of the first random access preamble.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the first random access channel procedure with the first network, the first random access preamble may be a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the first random access channel procedure with the first network, the first random access preamble may comprise receiving a Msg 1 or a Msg A.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting an acknowledgment message from the first network.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: when the acknowledgement message comprises an indication of successful contention resolution, causing one of: termination of the first random access procedure and the second random access channel procedure, and receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of a terminal.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: when the acknowledgement message comprises an indication of unsuccessful contention resolution, receiving, for the first random access channel procedure, a re-transmission of the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the second random access channel procedure with the second network, the second random access preamble while the first random access channel procedure is ongoing.
  • the apparatus may be comprised within a base station.
  • a system comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the system at least to perform: receiving, for a first random access channel procedure with a first network, a first random access preamble at a first apparatus; and receiving, for a second random access channel procedure with a second network, a second random access preamble at a second apparatus, prior to the first apparatus transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to the first apparatus failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the second random access channel procedure with the second network, the second random access preamble may occur during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the second random access channel procedure with the second network, the second random access preamble may occur during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving a small data transmission for the first network at the first apparatus.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the first random access channel procedure with the first network, the first random access preamble may be an initial reception of the first random access preamble.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the first random access channel procedure with the first network, the first random access preamble may be a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the first random access channel procedure with the first network, the first random access preamble may comprise receiving a Msg 1 or a Msg A.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, from the first apparatus, an acknowledgment message from the first network.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: when the acknowledgement message comprises an indication of successful contention resolution, causing one of: termination of the first random access procedure and the second random access channel procedure, and receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of a terminal.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: when the acknowledgement message comprises an indication of unsuccessful contention resolution, receiving, for the first random access channel procedure, a re-transmission of the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for the second random access channel procedure with the second network, the second random access preamble while the first random access channel procedure is ongoing.
  • the first apparatus may be comprised within a base station.
  • the second apparatus may be comprised within a base station.
  • a method comprising: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the method may comprise transmitting, for the second random access channel procedure with the second network, the second random access preamble during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the method may comprise transmitting, for the second random access channel procedure with the second network, the second random access preamble during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the method may comprise determining whether a first response message is received from the first network; and in response to determining that the first response message is not received, transmitting the second random access preamble during the time period that the transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the method may comprise, in response to the determining that the first response message is not received, terminating the first random access channel procedure if a predetermined amount of re-attempts have occurred.
  • the method may comprise, in response to determining that the first response message is received, processing the first response message from the first network.
  • the method may comprise transmitting a small data transmission to the first network.
  • the method may comprise transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the method may comprise transmitting, for the first random access channel procedure with the first network, the first random access preamble as an initial transmitting of the first random access preamble.
  • the method may comprise transmitting, for the first random access channel procedure with the first network, the first random access preamble as a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the method may comprise transmitting, for the first random access channel procedure with the first network, the first random access preamble comprising a Msg 1 or a Msg A.
  • the method may comprise receiving an acknowledgment message from the first network.
  • the method may comprise, when the acknowledgement message comprises an indication of successful contention resolution, performing one of: terminating the first random access procedure and the second random access channel procedure, and transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of the apparatus.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the method may comprise, when the acknowledgement message comprises an indication of unsuccessful contention resolution, retransmitting, for the first random access channel procedure, the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the method may comprise operating a first subscriber identity module to implement the first random access channel procedure, and a second subscriber identity module to implement the second random access channel procedure.
  • the method may comprise operating the first subscriber identity module in a receive mode and may be capable of operating the second subscriber identity module in a receive mode simultaneously.
  • the method may comprise transmitting, for the second random access channel procedure with the second network, the second random access preamble while the first random access channel procedure is ongoing.
  • the method may be performed by a terminal.
  • a method comprising: receiving, for a first random access channel procedure with a first network, a first random access preamble; and receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the method may comprise receiving, for the second random access channel procedure with the second network, the second random access preamble during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the method may comprise receiving, for the second random access channel procedure with the second network, the second random access preamble during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the method may comprise receiving a small data transmission for the first network.
  • the method may comprise receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the method may comprise receiving, for the first random access channel procedure with the first network, the first random access preamble as an initial reception of the first random access preamble.
  • the method may comprise receiving, for the first random access channel procedure with the first network, the first random access preamble as a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the method may comprise receiving, for the first random access channel procedure with the first network, the first random access preamble may comprise a Msg 1 or a Msg A.
  • the method may comprise transmitting an acknowledgment message from the first network.
  • the method may comprise, when the acknowledgement message comprises an indication of successful contention resolution, causing one of: termination of the first random access procedure and the second random access channel procedure, and receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of a terminal.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the method may comprise, when the acknowledgement message comprises an indication of unsuccessful contention resolution, receiving, for the first random access channel procedure, a re-transmission of the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the method may comprise receiving, for the second random access channel procedure with the second network, the second random access preamble while the first random access channel procedure is ongoing.
  • the method may be performed by a base station.
  • a method comprising: receiving, for a first random access channel procedure with a first network, a first random access preamble at a first apparatus; and receiving, for a second random access channel procedure with a second network, a second random access preamble at a second apparatus, prior to the first apparatus transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to the first apparatus failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure
  • the method may comprise receiving, for the second random access channel procedure with the second network, the second random access preamble during the listen period of the first random access channel procedure, wherein the listen period is a time period that transmission to the first network for the first random access channel procedure is not expected while reception from the first network is expected.
  • the method may comprise receiving, for the second random access channel procedure with the second network, the second random access preamble during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the method may comprise receiving a small data transmission for the first network.
  • the method may comprise receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the method may comprise receiving, for the first random access channel procedure with the first network, the first random access preamble as an initial reception of the first random access preamble.
  • the method may comprise receiving, for the first random access channel procedure with the first network, the first random access preamble as a subsequent transmitting of the first random access preamble following an initial transmitting.
  • the method may comprise receiving, for the first random access channel procedure with the first network, the first random access preamble may comprise a Msg 1 or a Msg A.
  • the method may comprise transmitting an acknowledgment message from the first network.
  • the method may comprise, when the acknowledgement message comprises an indication of successful contention resolution, causing one of: termination of the first random access procedure and the second random access channel procedure, and receiving, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of a terminal.
  • the quality of service modes may comprise: a maximum reliability mode, and a low latency mode.
  • the method may comprise, when the acknowledgement message comprises an indication of unsuccessful contention resolution, receiving, for the first random access channel procedure, a re-transmission of the first random access preamble to the first network.
  • the first network and the second network may be operated by different network operators.
  • the first and second random access channel procedures may be one of a: two-step, or four-step random access channel procedure.
  • the method may comprise receiving, for the second random access channel procedure with the second network, the second random access preamble while the first random access channel procedure is ongoing.
  • a computer program comprising computer executable instructions which when run on one or more processors perform: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a computer program comprising computer executable instructions which when run on one or more processors perform: receiving, for a first random access channel procedure with a first network, a first random access preamble; and receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a computer product stored on a medium may cause an apparatus to perform the methods as described herein.
  • An electronic device may comprise apparatus as described herein.
  • AUSF Authentication Server Function
  • AMF Access Management Function
  • DU Distributed Unit eNB: eNodeB gNB: gNodeB loT: Internet of Things
  • NEF Network Exposure Function
  • M2M Machine-to-machine
  • PBCH Physical Broadcast channel
  • PLMN Public Land Mobile Network PRACH Physical Random Access Channel
  • RACH Random Access Channel
  • SIM Subscriber Identity Module
  • UE User Equipment
  • 5GC 5G Core network
  • 5GRAN 5G Radio Access Network
  • Figure 1 shows a schematic representation of a 5G system
  • Figure 2 shows a schematic representation of a control apparatus
  • Figure 3 shows a schematic representation of a terminal
  • Figure 4 shows an example signalling diagram between a user device and a base station
  • FIG. 5a-5c shows various example signalling diagrams for random access procedures
  • Figure 6 shows another example signalling diagram for a random access procedure
  • Figures 7a and 7b schematically shows a network environment with a user device and a plurality of cells
  • Figure 8 shows an example flow diagram showing how a UE selects a small data transmission mode according to multi SIM capabilities of the UE and a quality of service type of the small data transmission;
  • Figure 9 shows an example signalling diagram for a sequential random access procedure
  • Figures 10a and 10b show an example signalling diagrams indicating idle periods and listening periods
  • Figure 11 shows an example signalling diagram with interleaved random access procedures
  • Figure 12 shows an example flow diagram for the selection of random access procedures
  • Figures 13 shows an example flow diagram for a 4-step random access procedure
  • Figure 14 shows an example flow diagram for a 2-step random access procedure
  • Figure 15 shows an example flow diagram of the remaining steps for the 4-step random access procedure
  • Figure 16 shows an example method flow performed by a user equipment
  • Figure 17 shows an example method flow diagram performed by a network entity
  • Figure 18 shows a schematic representation of a non-volatile memory medium storing instructions which when executed by a processor allow a processor to perform one or more of the steps of the method of Figures 16 and 17.
  • mobile communication devices/terminals or user apparatuses, and/or user equipments (UE), and/or machine-type communication devices 102, 104 are provided wireless access via at least one base station or similar wireless transmitting and/or receiving node or point.
  • a communication device is provided with an appropriate signal receiving and transmitting apparatus for enabling communications, for example enabling access to a communication network or communications directly with other devices.
  • the communication device may access a carrier provided by a station or access point, and transmit and/or receive communications on the carrier.
  • FIG. 1 shows a schematic representation of a 5G system (5GS).
  • the 5GS may comprises a terminal, a 5G radio access network (5GRAN), a 5G core network (5GC), one or more application function (AF) and one or more data networks (DIM).
  • 5GRAN 5G radio access network
  • 5GC 5G core network
  • AF application function
  • DIM data networks
  • the 5GRAN may comprise one or more gNodeB (gNB) distributed unit functions connected to one or more gNodeB (gNB) centralized unit functions.
  • gNB gNodeB
  • gNB gNodeB
  • the 5GC may comprise an access management function (AMF), a session management function (SMF), an authentication server function (AUSF), a user data management (UDM), a user plane function (UPF) and/or a network exposure function (NEF).
  • AMF access management function
  • SMF session management function
  • AUSF authentication server function
  • UDM user data management
  • UPF user plane function
  • NEF network exposure function
  • mobile communication devices/terminals or user apparatuses, and/or user equipments (UE), and/or machine-type communication devices are provided with wireless access via at least one base station or similar wireless transmitting and/or receiving node or point.
  • the terminal is provided with an appropriate signal receiving and transmitting apparatus for enabling communications, for example enabling access to a communication network or communications directly with other devices.
  • the communication device may access a carrier provided by a station or access point, and transmit and/or receive communications on the carrier.
  • FIG 2 illustrates an example of a control apparatus 200 for controlling a function of the 5GRAN or the 5GC as illustrated on Figure 1.
  • the control apparatus may comprise at least one random access memory (RAM) 211 a, at least on read only memory (ROM) 211 b, at least one processor 212, 213 and an input/output interface 214.
  • the at least one processor 212, 213 may be coupled to the RAM 211a and the ROM 211 b.
  • the at least one processor 212, 213 may be configured to execute an appropriate software code 215.
  • the software code 215 may for example allow to perform one or more steps to perform one or more of the present aspects.
  • the software code 215 may be stored in the ROM 211b.
  • the control apparatus 200 may be interconnected with another control apparatus 200 controlling another function of the 5GRAN or the 5GC.
  • each function of the 5GRAN or the 5GC comprises a control apparatus 200.
  • two or more functions of the 5GRAN or the 5GC may share a control apparatus.
  • FIG 3 illustrates an example of a terminal 300, such as the terminal illustrated on Figure 1.
  • the terminal 300 may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples comprise a user equipment, a mobile station (MS) or mobile device such as a mobile phone or what is known as a ’smart phone’, a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle), a personal data assistant (PDA) or a tablet provided with wireless communication capabilities, a machine-type communications (MTC) device, a Cellular Internet of things (CloT) device or any combinations of these or the like.
  • the terminal 300 may provide, for example, communication of data for carrying communications.
  • the communications may be one or more of voice, electronic mail (email), text message, multimedia, data, machine data and so on.
  • the terminal 300 may receive signals over an air or radio interface 307 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 306.
  • the transceiver apparatus 306 may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • the terminal 300 may be provided with at least one processor 301 , at least one memory ROM 302a, at least one RAM 302b and other possible components 303 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices.
  • the at least one processor 301 is coupled to the RAM 302a and the ROM 211b.
  • the at least one processor 301 may be configured to execute an appropriate software code 308.
  • the software code 308 may for example allow to perform one or more of the present aspects.
  • the software code 308 may be stored in the ROM 302b.
  • the processor, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 304.
  • the device may optionally have a user interface such as key pad 305, touch sensitive screen or pad, combinations thereof or the like.
  • a display, a speaker and a microphone may be provided depending on the type of the device.
  • SDT small data transmissions
  • SDT short and small in this context can be used interchangeably.
  • the SDT may be in uplink.
  • Some examples are in the context of enabling parallel SDTs in an apparatus such as a user device.
  • Some examples show SDT over multiple public land mobile networks (PLMNs) which may be available in multi-Universal Mobile Telecommunications Service (UMTS)-subscriber identify module (USIM) devices with multiple SIM/USIM cards.
  • PLMNs public land mobile networks
  • UMTS multi-Universal Mobile Telecommunications Service
  • USIM subscriber identify module
  • the multiple SIMs may be associated with/registered with different mobile network operators (MNO).
  • MNO mobile network operators
  • the small data transmission may be utilizing a transmission connected to available random access channel (RACH) procedures.
  • RACH random access channel
  • FIG. 4 shows an example signalling diagram of a RACH procedure. This may be for a message flow for an uplink SDT while a user equipment (UE) is in RRCJNACTIVE mode.
  • UE user equipment
  • Small data transmissions in RRCJNACTIVE refers to a feature wherein a UE in RRCJNACTIVE mode can transmit small UL data without performing a full state transition to RRCJDONNECTED.
  • This feature may be service-agnostic, catering for different service requirements.
  • This feature can work with 4-step or 2-step RACH. In the example of Figure 4, 4-step RACH is described.
  • a UE in RRCJNACTIVE sends a physical random access channel (PRACH) preamble to a base station/network (Msg1 ).
  • PRACH physical random access channel
  • the base station/network responds to the UE with a random access response (Msg 2).
  • the UE transmits a small data transmission to the base station (Msg 3).
  • the message may be in an RRCConnectionResumeRequest.
  • the message may be in a medium access control control element (MAC CE).
  • the message may comprises an access stratum (AS) context identifier (e.g. resumelD) to be used for contention resolution.
  • AS access stratum
  • This message may contain information to enable the network to move the UE to RRCJDONNECTED.
  • This message may contain enable the network to let the UE remain in RRCJNACTIVE.
  • the message may provide information to enable the network to apply overload control and prioritisation.
  • the network may move the UE to RRCJDONNECTED via a downlink radio resource control (RRC) Msg 4 (for example, an RRCConnectionResume message or a MAC CE message).
  • RRC radio resource control
  • the network may update the AS context with Msg 4.
  • the UE may send subsequent UL data transmission to the base station/network after receiving Msg 4.
  • An RRCJDONNECTED UE may have an active AS context that is suspended when the network moves the UE to RRCJNACTIVE.
  • the UE may be provided with an AS context identifier (e.g. resumelD).
  • the AS context may be stored in a base station. Using this AS context identifier, the AS context can be located and fetched to a new serving base station when the UE resumes its connection. If small data transmission in RRCJNACTIVE is supported, the same UE AS context identifier and location mechanisms should be used as in the state transition.
  • Types supported may include a 4-step contention-based random access (CBRA), a 2-step CBRA and contention- free random access (CFRA).
  • CBRA contention-based random access
  • CFRA contention- free random access
  • the UE may select the type of random access based on network configuration.
  • a network measurement such as a reference signal receive power threshold, may be used by the UE to select between 2-step CBRA and 4-step CBRA at initiation of the random access procedure.
  • Figure 5a shows an example signalling diagram for a 4-step CBRA.
  • the UE transmits a random access preamble to the base station.
  • the UE receives a random access response message from the base station.
  • the UE provides a scheduled transmission the base station.
  • the base station provides an indication of contention resolution to the UE.
  • Figure 5b shows an example signalling diagram for a 2-step CBRA.
  • the base station transmits a random access preamble assignment to the UE.
  • the UE transmits a random access preamble to the base station.
  • the base station transmits a random access response message to the UE.
  • Figure 5c shows an example signalling diagram for CFRA.
  • the UE transmits a random access preamble and physical upload shared channel (PUSCH) payload to the base station.
  • PUSCH physical upload shared channel
  • the base station provides an indication of contention resolution to the UE.
  • the UE monitors for a response from the network within a configured window. If contention resolution is successful upon receiving the network response message 523, the UE ends the random access procedure.
  • the UE transmits a scheduled transmission the base station S603.
  • the UE will monitor contention resolution from the base station. If contention resolution is not successful after Msg 3 (re)transmission(s), the UE goes back to S521.
  • the UE may switch to a 4-step CBRA procedure.
  • RACH the MSGA preamble is sent over the PRACH resources, while the Msg A data is sent over the PUSCH resources.
  • RACH Opportunities RO
  • PUSCH Opportunities PO
  • a multi-USIM device has two (Dual) or more (Multiple) simultaneous network subscriptions (such as 3GPP/3GPP2) with multiple corresponding International Mobile Subscriber Identities (IMSI) each associated with a particular USIM belonging to the same or different Mobile Network Operator/Mobile Network Virtual Operator.
  • An MUSIM device connected to one or more networks with independent subscriptions is shown in Figure 7.
  • a UE 703 with two USIMs belong to the same MNO/MVNO 701 , registered with two independent ID’s at the core network.
  • the two USIMs may be using the same cell or two neighbour cells as a serving cell.
  • another UE 705 with two USIMs belong to different MNOs 707, 709 and may be using two neighbouring or co-located cells from each MNO as serving cell.
  • MUSIM devices Two main types of MUSIM devices are normally referred to depending on the supported simultaneous RRC_states on the USIMs.
  • Dual SIM Dual Standby (DSDS) or Multi USIM Multi Standby (MUMS) MUSIM devices which are registered with two or more independent subscriber IDs (USIMs) and can be in RRCJDLE mode on two or more USIMs. However, it can be on RRC_CONNECTED mode with a single USIM at a given time.
  • USIMs independent subscriber IDs
  • MUMS Multi USIM Multi Standby
  • Dual SIM Dual Active or Multi USIM Multi Active MUSIM devices which are registered with two or more independent subscriber IDs (USIMs) and can be in RRCJDLE mode on two or more USIMs. And the device can maintain RRC_CONNECTED mode activities on two or more USIMs.
  • the UE’s behaviour with respect to the simultaneous handling of multiple USIMs may depend on the UE’s HW and SW capabilities as listed below:
  • the UE is capable of receiving traffic from one network and and/or transmitting traffic to one network at a time.
  • DualRx / SingleTx The UE is capable of simultaneously receiving traffic from two networks but is capable of transmitting to one network at a time.
  • DualRx / DualTx The UE is capable of simultaneously receiving traffic from two networks and/or simultaneously transmitting traffic to two networks.
  • the RACH procedure (the procedure over which the SDT is accomplished) is performed atomically and sequentially across the different PLMNs. This implementation can be slow and unreliable.
  • Multi-SIM UE has two SIMs, each belonging to a different PLMN. It should be appreciated that in other examples, a MUSIM UE may have more than two USIMs, belonging to one or more PLMNs.
  • a short data payload arrives from the upper layers of the UE. This leads to decision block 803. If the UE has no SIMs that support SDT then the UE will proceed with a scheduling request (SR) or a pre-configured configured grant (CG) and proceed with SDT procedure in one or several of the available SIMs while the UE is in RRCJnactive mode, as shown in result block 805. If one of the UE’s SIMs associated PLMN supports SDT capabilities then the UE proceeds with the SDT in that PLMN, as shown in result block 807. If the UE has multiple SIM support for SDT then the flow proceeds to decision block 809.
  • SR scheduling request
  • CG pre-configured configured grant
  • the SDT is duplicated across multiple PLMNs, as shown in result block 811. If the quality of service aim for the SDT is lower latency, then the SDT is to be transmitted as soon as possible. Therefore, the UE will start multiple SDT attempts across multiple PLMNs until at least one is successful, as shown in result block 813.
  • FIG. 9 shows example signalling between a UE and a first base station associated with a first PLMN, a so called first RACH procedure 901 .
  • a second RACH procedure 903 is initiated with UE and a second base station associated with a second PLMN.
  • the UE makes two sequential attempts to transmit the PRACH to the first base station.
  • the reason for the failure is a power ramping related failure. In other examples, a different failure may occur.
  • the UE successfully transmits the PRACH to the first base station.
  • the first base station transmits a random access response to the UE.
  • the UE will then transmit an SDT message to the first base station.
  • the UE receives an acknowledgment message from the first base station.
  • the UE is then able to initiate a RACH procedure with the second PLMN.
  • the UE attempts to transmit a PRACH to the second base station which is unsuccessful.
  • the UE then reattempts transmission of the PRACH to the second base station which is successfully received.
  • the second base station transmits a random access response to the UE.
  • the UE will then transmit an SDT message to the second base station.
  • the SDT message was not successfully transmitted to second first base station.
  • the second base station therefore transmits a negative acknowledgement (NACK) to the UE.
  • NACK negative acknowledgement
  • the SDT was unsuccessful due to a preamble collision failure.
  • this failure may have been due to a different reason.
  • the UE then successfully performs a 4-step RACH procedure with the second base station without any failures. There may be a predetermined amount of times that the UE will attempt to transmit the PRACH to the base station and fail before the RACH procedure is terminated.
  • the UE no longer treats the different stages of the RACH procedure at a PLMN as an atomic unit, and instead can exploit the idle periods to start/continue other RACH procedures at the other available PLMNs.
  • the idle periods depicted in Figures 10a and 10b, are time intervals where the UE is not scheduled to transmit to or receive from the network in relation to the ongoing RACH process. Therefore, these time periods can be exploited by the UE to initiate or continue parallel RACH processes. The result is that several RACH processes can be interleaved with each other. This may be considered as time multiplexing the RACH procedures at the UE.
  • the exploitable time periods are the idle time periods.
  • the listening periods can also be exploitable, as the UE is capable of simultaneous reception on both SIMs.
  • different PLMNs will have different RACH configurations, including differences in the periodicity of their resources. The difference between these periodicities can be exploited to achieve a tighter interleaving between RACH processes across different PLMNs.
  • An identification of example idle periods and listen periods in the 4-step and 2-step RACH procedures is depicted in Figures 10a and 10b.
  • Figure 10a shows example signalling for a 4-step RACH procedure.
  • the UE will transmit during the transmission periods 1000.
  • the UE also has alternating “listen” periods 1001 and “idle” periods 1003.
  • listen period may comprise a predetermined timer.
  • idle period 1003 wherein the UE will not be expected to transmit to, or receive from, the network.
  • the length of these periods may vary.
  • the period lengths shown in Figures 10a and 10b are shown as examples only. In other examples, any suitable period length may be used.
  • a UE will not attempt to transmit to the network.
  • Figure 10b shows example signalling for a 2 step RACH procedure. Alternating “listen” periods 1007 and “idle” periods 1005 for the UE are shown. Similar to Figure 10a, the UE will transmit to the base station/network during transmission periods 1000. The length of these periods shown is an example only. In Figure 10b the PUSCH in “Msg A” failed to be successfully received by the base station. After receiving the contention resolution in “Msg B” the UE waits for the idle period 1005 before a re-transmission of the PRACH and PUSCH is reattempted. Between a Msg B (CR) and a Msg A (PRACH) there will be an idle period. When the Msg A (PRACH) is transmitted to the base station, the transmission is occupied. The period between Msg A (PRACH) and Msg A (PUSCH) will also be another idle period.
  • CR Msg B
  • PRACH Msg A
  • FIG 11 shows an example of interleaved RACH procedure across different PLMNs.
  • the idle periods between RACH re-attempts are used for other RACH procedures.
  • a 4-step RACH procedure is described. It should be appreciated that this mechanism is also applicable to 2-step RACH procedures.
  • the UE is communicating with two base stations (“gNB”) which are respectively operated by a first PLMN and a second PLMN.
  • the UE may transmit to a single base stations, wherein the single base station is operated by both the first and second PLMN.
  • the UE transmits messages to the a gNB of the first PLMN and a gNB of the second PLMN.
  • the UE transmits a PRACH to the first PLMN (PLMN 1 ). This transmission of the PRACH is unsuccessful. The UE will then enter an idle period 1150 for the first RACH procedure. In current mechanisms the UE would wait until the idle period 1150 ended and then reattempt the PRACH transmission for the first RACH procedure, as shown in Figure 9.
  • the UE will instead initiate a second RACH procedure.
  • the UE transmits a PRACH to the second PLMN.
  • the first and second PLMN may be different.
  • the transmission of the PRACH is unsuccessful.
  • the UE will then enter an idle period 1160 for the second RACH procedure.
  • the UE transmits a PRACH to the first PLMN during the idle period 1160 of the second RACH procedure. This transmission of the PRACH is also unsuccessful. The UE then enters an idle period 1170 for the first RACH procedure.
  • the UE transmits a PRACH to the second PLMN during the idle period 1170 of the first RACH procedure.
  • the UE receives a random access response message from the second
  • the UE provides an SDT to the second PLMN.
  • This transmission is unsuccessful due to a preamble collision related failure. In other examples, the failure may be due to another reason. In other examples, the transmission may have reached the second base station successfully.
  • the UE receives a negative acknowledgement message from the second PLMN to indicate that the SDT was unsuccessful.
  • the second RACH procedure then enters an idle period 1180.
  • the UE transmits a PRACH to the first PLMN, during the idle period 1180 of the second RACH procedure.
  • the UE receives a random access response message from the first PLMN.
  • the UE provides an SDT to the first base station.
  • the UE receives an acknowledgement message from the second PLMN to indicate that the SDT was successful.
  • the quality of service type selected is low latency (i.e. “as soon as possible”). Therefore, as the SDT has been successfully transmitted to the first PLMN, the other parallel RACH procedure (i.e. the second RACH procedure) can be terminated/stopped. In a different example, if the quality of service type was “maximum reliability” then the second RACH procedure would not be stopped, and instead would continue until there was successful provision of the SDT to the second PLMN. In some examples, this proposed mechanism as shown in Figure 11 may be applicable to inter-PLMN parallel SDT transmissions, for SIMs in the MUSIM device belonging to different PLMNs.
  • FIG 12 there is a flow diagram for a procedure performed by a MUSIM in a UE.
  • the MUSIM may perform this procedure when establishing the first and any other parallel RACH procedure.
  • a RACH procedure is initiated, as shown in block 1201.
  • the UE selects one of the SIMs/MUSIMs of the UE.
  • Each SIM may be associated with a different PLMN. If the UE have two or more SIMs then some of the two or more SIMs may be associated with the same PLMN.
  • the RACH type is decided.
  • a decision of 4-step RACH is shown in block 1207.
  • a decision of 2-step RACH is shown in block 1209.
  • the type of RACH may be decided due to the network conditions at the time. In other examples, other reasons may contribute to the outcome of the decision.
  • Figure 13 shows an example flow diagram which illustrates how the multi-USIM UE starts parallel 4-step RACH procedures. This may be done in order to perform the SDT according to different quality of service modes as described previously.
  • the UE has determined that the RACH procedure will be a 4-step procedure, the 4-step RACH procedure as described previously.
  • the UE will transmit a random access preamble (‘Msg T) to a base station/network. Throughout this flow, base station and network may be used interchangeably.
  • the UE will wait for a random access response message (‘Msg 2’) from the base station. The reception condition is either due to the random access response message arriving or by an associated timer expiring
  • the UE does not receive ‘Msg 2’ within a predetermined period of time then it will be determined whether the number of RACH attempts has reached a threshold.
  • the number of RACH attempts in a single SDT process is limited.
  • the number of RACH attempts may be kept track by the UE
  • the threshold for the number of RACH attempts may be, for example, 3 times. In other examples, the threshold may be higher or lower than 3.
  • the predetermined period may be referred to as a listening period of the UE.
  • Label 1309 shows another entry into the flow block 1307 which will be described later alongside Figure 15.
  • the flow goes to block 1311 of Figure 13. This results in ending the current RACH process.
  • the UE will then transition to any remaining active RACH processes. Whenever there is an idle period, the UE has the option to transition to another already occurring RACH process. The already occurring RACH process may be also paused due to an idle period. If there are no active RACH processes, then the UE will initiate a new RACH/SDT process.
  • the new SDT process can be either a 2- step or a 4-step RACH process.
  • a back-off may also be referred to as an idle period/idle mode.
  • the UE will determine whether there are any additional SIMs to establish parallel RACH procedures.
  • the flow goes to block 1317.
  • the UE will transition to another active process if there is one. If there is no active RACH process then the UE will initiate a new SDT process on the other SIM.
  • the new SDT process may be with a different PLMN compared to the current RACH process.
  • the UE will process the ‘Message 2’.
  • the UE will perform the remaining 4-step RACH process steps.
  • the 4- step RACH procedure may also transition to a 2-step RACH process. This will be described in more detail alongside Figure 15.
  • Figure 14 shows an example flow diagram which illustrates how the multi-USIM UE starts parallel 2-step RACH procedures. This may be done in order to perform the SDT according to different quality of service modes as described previously.
  • the UE has determined that the RACH procedure will be a 2-step procedure, the 2-step RACH procedure as described previously.
  • the UE will transmit a ‘Msg A’ to a base station.
  • the ‘Msg A’ may comprise a PRACH and/or a PUSCH.
  • the UE will wait fora response message (‘Msg B’) from the base station.
  • the UE does not receive ‘Msg B’ within a predetermined period of time then it will be determined whether the number of RACH attempts has reached a threshold.
  • the threshold for the number of RACH attempts may be, for example, 3 times. In other examples, the threshold may be higher or lower than 3.
  • the predetermined period may be referred to as a listening period of the UE.
  • Label 1409 shows another entry into the flow block 1307 which will be described later.
  • the flow goes to block 1411.
  • the UE ends the current RACH process.
  • the UE will then transition to any remaining active RACH processes. If there are no active RACH processes, then the UE may initiate a new RACH process.
  • a back-off may also be referred to as an idle period/idle mode.
  • the UE will determine whether there are any additional SIMs to establish parallel RACH procedures.
  • the flow goes to block 1417.
  • the UE may transition to another active process if there is one. If there are no active RACH processes then the UE may initiate a new SDT process on the other SIM. The new SDT process may be with a different PLMN compared to the current RACH process.
  • the UE will process received ‘Msg B’.
  • the UE will determine if ‘Msg A’ PUSCH was correctly received.
  • the flow goes to block 1427.
  • the UE will end the current RACH process and terminate the remaining active processes if there are any.
  • the flow foes to block 1429.
  • the UE will transition to other active SDT processors. If there are no other SDT processes then the UE may initiate a new SDT process.
  • the UE will determine whether to proceed with the 2-step RACH process or change to a 4-step RACH process.
  • the UE may decide between 2-step and 4-step RACH based on current network conditions. For example, if the UE moves, then the conditions to select between 2-step and 4- step RACH might change. A selection between 2-step and 4-step may be based on a measured RSRP from a current synchronisation signal block. Therefore, if the UE moves then these conditions/RSRP may change.
  • Figure 15 shows an example flow diagram showing the remaining steps of the 4-step RACH process.
  • block 1501 the remaining 4-step RACH process starts. This follows on from block 1323 in Figure 23 and block 1433 in Figure 14.
  • the UE determines if there is enough time until the next ‘Msg 3’ resource being received (i.e. resource for S405 from Figure 4).
  • the UE determines that there is enough time to the next ‘Msg 3’ resource, then the UE will transition to another active SDT process. If there is no active SDT process then the UE may initiate a new SDT process.
  • the UE determines that there is not enough time to the next ‘Message 3’ resource, then the UE will wait for the ‘Msg 3’ resource.
  • the UE may provide an SDT to the base station using the resource.
  • the UE waits for ‘Msg 4’ from the base station (i.e. S407 from Figure 4).
  • the UE receives ‘Msg 4’ from the base station indicating that contention resolution was successful. The UE will then determine which quality of service mode is selected. The quality of service mode may be as discussed previously. In block 1513, when the quality of service mode for the UE is low latency, the UE will end the current RACH process and terminate the remaining active RACH processes if there are any.
  • the UE when the quality of service mode is maximum reliability, the UE will transition to one of the other active RACH processes if there is one. If there is no other active RACH processes then the UE will initiate a new SDT process.
  • the UE will determine whether the UE wants to re-attempt an SDT RACH process using a 2-step process or 4-step process.
  • the example mechanisms may be used in user devices such as user equipments and mobile devices.
  • the example mechanisms may also be effective in loT applications and machine-to-machine (M2M) communication devices.
  • M2M machine-to-machine
  • Figure 16 shows an example method flow performed by a first apparatus.
  • the first apparatus may be comprised within a terminal, or user device.
  • the first apparatus performs transmitting, for a first random access channel procedure with a first network, a first random access preamble.
  • the first apparatus performs transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • Figure 17 shows an example method flow performed by second apparatus.
  • the second apparatus may be comprises within a network entity such as, for example, a base station or other suitable network device.
  • the second apparatus performs receiving, for a first random access channel procedure with a first network, a first random access preamble.
  • the second apparatus performs receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • Figure 18 shows a schematic representation of non-volatile memory media 1800a (e.g. computer disc (CD) or digital versatile disc (DVD)) and 1800b (e.g. universal serial bus (USB) memory stick) storing instructions and/or parameters 1802 which when executed by a processor allow the processor to perform one or more of the steps of the methods of Figures 16 and 17.
  • CD computer disc
  • DVD digital versatile disc
  • USB universal serial bus
  • some embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although embodiments are not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although embodiments are not limited thereto. While various embodiments may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the examples may be implemented by computer software stored in a memory and executable by at least one data processor of the involved entities or by hardware, or by a combination of software and hardware.
  • any procedures e.g., as in Figures 12 and 13, may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions.
  • the software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.
  • the memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASIC), gate level circuits and processors based on multi core processor architecture, as non-limiting examples.
  • circuitry may be configured to perform one or more of the functions and/or method steps previously described. That circuitry may be provided in the base station and/or in the communications device.
  • circuitry may refer to one or more or all of the following:
  • circuit(s) and or processor(s) such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.
  • software e.g., firmware
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example integrated device.
  • An apparatus comprising means for: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the means is for: transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the means is for: when the acknowledgement message comprises an indication of successful contention resolution, performing one of: terminating the first random access channel procedure and the second random access channel procedure, and transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of the apparatus.
  • An apparatus comprising means for: receiving, for a first random access channel procedure with a first network, a first random access preamble; and receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a system comprising means for: receiving, for a first random access channel procedure with a first network, a first random access preamble at a first apparatus; and receiving, for a second random access channel procedure with a second network, a second random access preamble at a second apparatus, prior to the first apparatus transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to the first apparatus failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a method comprising: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a method comprising: receiving, for a first random access channel procedure with a first network, a first random access preamble; and receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a computer program comprising computer executable instructions which when run on one or more processors perform: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • the transmitting, for the second random access channel procedure with the second network, of the second random access preamble occurs during the idle period of the first random access channel procedure, wherein the idle period is a time period that transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to perform: determining whether a first response message is received from the first network; and in response to determining that the first response message is not received, transmitting the second random access preamble during the time period that the transmission to the first network for the first random access channel procedure is not expected and reception from the first network is not expected.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to perform: transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to perform: when the acknowledgement message comprises an indication of successful contention resolution, performing one of: terminating the first random access channel procedure and the second random access channel procedure, and transmitting, for the second random access channel procedure with the second network, the second random access preamble during one of: the listening period, and idle period of the first random access channel procedure, based on a quality of service mode of the apparatus.
  • An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: receiving, for a first random access channel procedure with a first network, a first random access preamble; and receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a system comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the system at least to perform: receiving, for a first random access channel procedure with a first network, a first random access preamble at a first apparatus; and receiving, for a second random access channel procedure with a second network, a second random access preamble at a second apparatus, prior to the first apparatus transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to the first apparatus failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a method comprising: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a method comprising: receiving, for a first random access channel procedure with a first network, a first random access preamble; and receiving, for a second random access channel procedure with a second network, a second random access preamble, prior to transmitting a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to transmit the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.
  • a computer program comprising computer executable instructions which when run on one or more processors perform: transmitting, for a first random access channel procedure with a first network, a first random access preamble; and transmitting, for a second random access channel procedure with a second network, a second random access preamble, prior to receiving a first random access response message from the first network for the first random access channel procedure in a listen period of the first random access channel procedure, or subsequent to failing to receive the first random access response message from the first network for the first random access channel procedure in an idle period of the first random access channel procedure.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un appareil avec des moyens destinés à : la transmission, pour une première procédure de canal d'accès aléatoire avec un premier réseau, d'un premier préambule d'accès aléatoire, et la transmission, pour une seconde procédure de canal d'accès aléatoire avec un second réseau, d'un second préambule d'accès aléatoire, avant la réception d'un premier message de réponse d'accès aléatoire provenant du premier réseau pour la première procédure de canal d'accès aléatoire dans une période d'écoute de la première procédure de canal d'accès aléatoire, ou après l'échec de la réception du premier message de réponse d'accès aléatoire provenant du premier réseau pour la première procédure de canal d'accès aléatoire dans une période inactive de la première procédure de canal d'accès aléatoire.
PCT/FI2021/050112 2020-02-27 2021-02-17 Procédé, appareil et programme informatique WO2021170907A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180109976A1 (en) * 2016-10-14 2018-04-19 Qualcomm Incorporated Rach procedures using multiple prach transmissions
WO2018075534A1 (fr) * 2016-10-19 2018-04-26 Qualcomm Incorporated Conception de procédure de canal d'accès aléatoire (rach)
WO2018176407A1 (fr) * 2017-03-31 2018-10-04 富士通株式会社 Procédé, dispositif d'accès aléatoire et système de communication

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Publication number Priority date Publication date Assignee Title
US20180109976A1 (en) * 2016-10-14 2018-04-19 Qualcomm Incorporated Rach procedures using multiple prach transmissions
WO2018075534A1 (fr) * 2016-10-19 2018-04-26 Qualcomm Incorporated Conception de procédure de canal d'accès aléatoire (rach)
WO2018176407A1 (fr) * 2017-03-31 2018-10-04 富士通株式会社 Procédé, dispositif d'accès aléatoire et système de communication

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HUAWEI ET AL.: "Enhancement to initial access in NR unlicensed", 3GPP TSG RAN WG1 MEETING #97 RENO R1-1906045., 3 May 2019 (2019-05-03), XP051708087, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_97/Docs/R1-1906045.zip> [retrieved on 20210514] *
VIVO: ". Report of phase 1 Multi-SIM email discussion", 3GPP TSG-RAN WG MEETING #85 NEWPORT BEACH RP-191898, 9 September 2019 (2019-09-09), XP051782444, Retrieved from the Internet <URL:https://www.3gpp.org/ftp/tsg_ran/TSG_RAN/TSGR_85/Docs/RP-191898.zip> [retrieved on 20210511] *

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