NR sidelink control message design

A network entity for a wireless communication system, the wireless communication comprising one or more user devices (UEs) to be connected to one or more further UEs for a sidelink communication with the one or more further UEs, the sidelink communication comprising a first-stage sidelink control message and a second-stage sidelink control message to be transmitted on sidelink resources,

• wherein the network entity comprises:
• one or more processors, wherein the one or more processors configure the network entity to signal to a receiving UE or a group of receiving UEs the first-stage sidelink control message, wherein information embedded in the first-stage sidelink control message indicates time and frequency resources for the second-stage sidelink control message and a configuration of the second-stage sidelink control message,
• wherein the information embedded in the first-stage sidelink control message includes a periodicity with which the first-stage sidelink control message and/or the second-stage sidelink control message are repeated, wherein the periodicity is signaled or selected by a variable number of bits, wherein the variable number of bits represent an entry into a list of periodicities selected from a set of predefined periodicities, and wherein at least one of the predefined periodicities is a predefined value for the periodicity which signals a single-shot transmission of the first-stage sidelink control message and/or the second-stage sidelink control message without any periodicity.

A wireless communication system comprising:

• a user device (UE) comprising one or more processors,
• wherein the one or more processors configure the UE to establish a sidelink communication with one or more further UEs in the wireless communication system, the sidelink communication comprising a first-stage sidelink control message and a second-stage sidelink control message to be transmitted on sidelink resources,
• wherein the one or more processors further configure the UE to identify the first-stage sidelink control message and the second-stage sidelink control message for the UE;
• and
• to decode the first-stage sidelink control message for the UE to derive control information embedded in the first-stage sidelink control message, wherein the information embedded in the first-stage sidelink control message indicates time and frequency resources for the second-stage sidelink control message and a configuration of the second-stage sidelink control message,
• wherein the information embedded in the first-stage sidelink control message includes a periodicity with which the first-stage sidelink control message and/or the second-stage sidelink control message are repeated, wherein the periodicity is signaled or selected by a variable number of bits, wherein the variable number of bits represent an entry into a list of periodicities selected from a set of predefined periodicities, and wherein at least one of the predefined periodicities is a predefined value for the periodicity which signals a single-shot transmission of the first-stage sidelink control message and/or the second-stage sidelink control message without any periodicity, and/or
• a network entity comprising one or more processors,
• wherein the one or more processors configure the network entity to signal to a receiving UE or a group of receiving UEs a first-stage sidelink control message, wherein information embedded in the first-stage sidelink control message indicates time and frequency resources for the second-stage sidelink control message and a configuration of a second-stage sidelink control message,
• wherein the information embedded in the first-stage sidelink control message includes a periodicity with which the first-stage sidelink control message and/or the second-stage sidelink control message are repeated,
• wherein the periodicity is signaled or selected by a variable number of bits, wherein the variable number of bits represent an entry into a list of periodicities selected from a set of predefined periodicities, and wherein at least one of the predefined periodicities is a predefined value for the periodicity which signals a single-shot transmission of the first-stage sidelink control message and/or the second-stage sidelink control message without any periodicity.

A method for a wireless communication system, the method comprising:

• connecting a user device (UE) to one or more further UEs in the wireless communication system for a sidelink communication with the one or more further UEs, the sidelink communication comprising a first-stage sidelink control message and a second-stage sidelink control message to be transmitted on sidelink resources;
• identifying, by the UE, a first-stage sidelink control message and the second-stage control message for the UE;
• and
• decoding, by the UE, the first-stage sidelink control message for the UE to derive control information embedded the first-stage sidelink control message, wherein the information embedded in the first-stage sidelink control message indicates time and frequency resources for the second-stage sidelink control message and a configuration of the second-stage sidelink control message,
• wherein the information embedded in the first-stage sidelink control message includes a periodicity with which the first-stage sidelink control message and/or the second-stage sidelink control message are repeated, wherein the periodicity is signaled or selected by a variable number of bits, wherein the variable number of bits represent an entry into a list of periodicities selected from a set of predefined periodicities, and wherein at least one of the predefined periodicities is a predefined value for the periodicity which signals a single-shot transmission of the first-stage sidelink control message and/or the second-stage sidelink control message without any periodicity.

A method for operating a wireless communication system, the wireless communication system comprising one or more user devices (UEs) to be connected to one or more further UEs for a sidelink communication with the one or more further UEs, the sidelink communication comprising a first-stage sidelink control message and a second-stage sidelink control message to be transmitted on sidelink resources, the method comprising:

• signaling, by a network entity, to a receiving UE or a group of receiving UEs the first-stage sidelink control message, wherein information embedded in the first-stage sidelink control message indicates time and frequency resources for the second-stage sidelink control message and a configuration of the second-stage sidelink control message,
• wherein the information embedded in the first-stage sidelink control message includes a periodicity with which the first-stage sidelink control message and/or the second-stage sidelink control message are repeated, wherein the periodicity is signaled or selected by a variable number of bits, wherein the variable number of bits represent an entry into a list of periodicities selected from a set of predefined periodicities, and wherein at least one of the predefined periodicities is a predefined value for the periodicity which signals a single-shot transmission of the first-stage sidelink control message and/or the second-stage sidelink control message without any periodicity.

A non-transitory digital storage medium having a computer program stored thereon to perform, when the computer program is run by a computer, a method for operating a wireless communication system, the method comprising:

• connecting a user device (UE) to one or more further UEs in the wireless communication system for a sidelink communication with the one or more further UEs, the sidelink communication comprising a first-stage sidelink control message and a second-stage sidelink control message to be transmitted on sidelink resources;
• identifying, by the UE, the first-stage sidelink control message and the second-stage control message for the UE;
• and
• decoding, by the UE, the first-stage sidelink control message for the UE to derive control information embedded in the first-stage sidelink control message,
• wherein the information embedded in the first-stage sidelink control message indicates time and frequency resources for the second-stage sidelink control message and a configuration of the second-stage sidelink control message,
• wherein the information embedded in the first-stage sidelink control message includes a periodicity with which the first-stage sidelink control message and/or the second-stage sidelink control message are repeated, wherein the periodicity is signaled or selected by a variable number of bits, wherein the variable number of bits represent an entry into a list of periodicities selected from a set of predefined periodicities, and
• wherein at least one of the predefined periodicities is a predefined value for the periodicity which signals a single-shot transmission of the first-stage sidelink control message and/or the second-stage sidelink control message without any periodicity.

A non-transitory digital storage medium having a computer program stored thereon to perform, when the computer program is run by a computer, a method for operating a wireless communication system, the wireless communication comprising one or more user devices (UEs) to be connected to one or more further UEs for a sidelink communication with the one or more further UEs, the sidelink communication comprising a first-stage sidelink control message and a second-stage sidelink control message to be transmitted on sidelink resources, the method comprising:

• signaling, by a network entity, to a receiving UE or a group of receiving UEs the first-stage sidelink control message, wherein information embedded in the first-stage sidelink control message indicates time and frequency resources for the second-stage sidelink control message and a configuration of the second-stage sidelink control message,
• wherein the information embedded in the first-stage sidelink control message includes a periodicity with which the first-stage sidelink control message and/or the second-stage sidelink control message are repeated, wherein the periodicity is signaled or selected by a variable number of bits, wherein the variable number of bits represent an entry into a list of periodicities selected from a set of predefined periodicities, and
• wherein at least one of the predefined periodicities is a predefined value for the periodicity which signals a single-shot transmission of the first-stage sidelink control message and/or the second-stage sidelink control message without any periodicity.