Method for transmitting a re-transmission information to a wireless device, preferably an ambient internet of things, a-iot, device of a communication network

Abstract

A method for transmitting, by a radio node (16, 18) of a communication network (10), a re-transmission information to a wireless device (20; 20a, 20b, 20c), preferably an ambient Internet of Things, A-IoT, device (20; 20a, 20b, 20c) of the communication network (10), comprising: - Receiving, by the radio node (16, 18), a paging message from a core network node (14); - Transmitting, by the radio node (16, 18), the received paging message to the wireless device (20; 20a, 20b, 20c); and - Transmitting, by the radio node (16, 18), a re-transmission information to the wireless device (20; 20a, 20b, 20c) based on a detection of a failed transmission of a data unit to be transmitted in response to the transmitted paging message, wherein the re-transmission information indicates at least one data unit to be re-transmitted.

Description

[0001] R. 418041

[0002] - 1 -

[0003] Specification

[0004] Title

[0005] Method for transmitting a re-transmission information to a wireless device, preferably an ambient Internet of Things, A-loT, device of a communication network

[0006] The invention concerns a method for transmitting, by a radio node of a communication network, a re-transmission information to a wireless device, preferably an ambient Internet of Things, A-loT, device of the communication network, and a corresponding method for re-transmitting, by a wireless device, preferably an A-loT device of a communication network, a data unit based on a received re-transmission information. Further, the invention concerns a node of a communication network, a wireless device, preferably an A-loT device, a computer program, a non-transitory computer readable medium, a retransmission message, and a data carrier signal.

[0007] Background

[0008] The state of the art in A-loT devices, as currently studied by 3GPP, encompasses low-complexity, low-energy demanding wireless devices designed for various use cases, such as inventory management, localization, and sensor data exchange within indoor and outdoor environments. These wireless devices are categorized into three main groups, each with different power consumption and transmission characteristics.

[0009] Type 1 devices have a peak power consumption of approximately 1 pW, comprise an energy storage, and have an initial sampling frequency offset (SFO) of up to 10xppm. They do not have amplification in the device for either downlink (DL) or uplink (UL) transmission, and their UL transmission is based on backscattering an externally provided carrier wave. There may also be a type similar to Type 1 , but without an energy storage.R. 418041

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[0011] Type 2a and Type 2b devices have peak power consumption of a few hundred pW, comprise an energy storage, and have an initial SFO of up to 10xppm. Both types have amplification for DL and / or UL transmission, with Type 2a devices generating UL transmissions by backscattering externally provided carrier waves and Type 2b devices generating UL transmissions independently with active radio frequency components.

[0012] The A-loT device may be configured to directly and bidirectionally communicate with a user equipment or a base station. The A-loT device may also be configured to indirectly and bidirectionally communicate with a base station via at least one intermediate node, such as a user equipment (UE), a reader, or a relay.

[0013] The A-loT device may also be configured for receiving DL transmissions directly from a base station, and for sending UL transmissions to the base station via at least one assisting node. The A-loT device may alternatively be configured for receiving DL transmissions from the base station via at least one assisting node, and for sending UL transmissions directly to the base station.

[0014] Disclosure of the invention

[0015] According to a first aspect, there is provided a method for transmitting, by a radio node of a communication network, a re-transmission information to a wireless device, preferably an ambient Internet of Things, A-loT, device of the communication network.

[0016] The method according to the first aspect comprises:

[0017] Receiving, by the radio node, a paging message from a core network node;

[0018] Transmitting, by the radio node, the received paging message to the wireless device; and

[0019] Transmitting, by the radio node, a re-transmission information to the wireless device based on a detection of a failed transmission of a data unit to be transmitted in response to the transmitted paging message, wherein the re-transmission information indicates at least one data unit to be re-transmitted.R. 418041

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[0021] The method according to the first aspect can be understood as a method for wireless communications, specifically of operating the radio node, of the communication network, particularly performed by the radio node.

[0022] According to a second aspect, there is provided a method for re-transmitting, by a wireless device, preferably an ambient Internet of Things, A-loT, device of a communication network, a data unit based on a received re-transmission information.

[0023] The method according to the second aspect comprises:

[0024] Receiving, by the wireless device, a paging message transmitted from the radio node;

[0025] Transmitting, by the wireless device, one or multiple data units to the radio node in response to the received paging message;

[0026] Receiving, by the wireless device, a re-transmission information from the radio node, wherein the re-transmission information indicates at least one data unit to be re-transmitted; and

[0027] Re-transmitting, by the wireless device, the at least one indicated data unit to the radio node based on the received re-transmission information.

[0028] The method according to the second aspect can be understood as a method for wireless communications, specifically of operating the wireless device, preferably the A-loT device, of the communication network, particularly performed by the wireless device.

[0029] According to a third aspect, there is provided a node of a communication network. The node is adapted to execute the method according to the first aspect, or its embodiments. Preferably, the node is a radio node, such as a base station or a user equipment. Here, the node may be configured as a reader for the wireless device, specifically the A-loT device.

[0030] According to a fourth aspect, there is provided a wireless device, preferably an A-loT device, of a communication network. The wireless device is adapted to execute the method according to the second aspect, or its embodiments.R. 418041

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[0032] According to a fifth aspect, there is provided a computer program comprising machine-readable instructions to cause

[0033] the node as defined by the third aspect to execute the method according to the first aspect, and / or its embodiments, and / or

[0034] the wireless device as defined by the fourth aspect to execute the method according to the second aspect, and / or its embodiments.

[0035] According to a sixth aspect, there is provided a non-transitory computer readable medium having stored thereon the computer program as defined by the fifth aspect.

[0036] According to a seventh aspect, there is provided a re-transmission message to be transmitted from a radio node of a communication network to a wireless device, preferably an ambient Internet of Things, A-loT, device, of the communication network.

[0037] The re-transmission message comprises a data field containing at least one of - an identification information indicating one or multiple data unit(s) to be re-transmitted,

[0038] - a counter indicating a number of most recently transmitted, consecutive data units to be re-transmitted,

[0039] - a resource information indicating radio resources allocated to the wireless device for the re-transmission,

[0040] - a random access type information indicating a type of a random access procedure to be performed, by the wireless device, to access a channel for the re-transmission,

[0041] - an access round information indicating an access round for the retransmission,

[0042] - a reception information identifying the successfully received data unit(s), - an identification information of a most recently successfully received data unit,

[0043] - a re-transmission indicator indicating that the re-transmission information is not part of a paging information provided by a core network node. The paging message may be embodied in a data structure comprising the data field(s). The paging message is preferably transmitted on a Paging Control Channel (PCCH) of the communication network.R. 418041

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[0045] According to an eighth aspect, there is provided a data carrier signal carrying the computer program as defined by the fifth aspect, and / or its embodiments, or the message as defined by the seventh aspect, and / or its embodiments.

[0046] The communication network may comprise a wireless network and a core network. The communication network may be configured as a cellular network, preferably according to 3GPP specifications, e.g., according to 3GPP release 18 or beyond. The communication network comprises at least one radio node and at least one wireless device, preferably at least one A-loT device. The radio node may be configured as a reader for ambient loT devices, or a relay or an integrated access and backhaul (IAB) node.

[0047] The wireless device may be configured as a low-energy or low-power device. The wireless device may have a peak power consumption of less than 1 mW, preferably less than 500 pW, specifically less than 100 pW, according to an embodiment, less than 10 pW, e.g., approximately 1 pW.

[0048] The wireless device is preferably configured for energy harvesting, thus exploiting ambient energy sources, e.g., radio waves, thermal radiation, mechanical vibrations etc. as power supply. The wireless device may or may not comprise an energy storage, e.g., a battery.

[0049] Specifically, the wireless device is different from a Reduced Capability (Redcap) device, a narrow band loT (NB-loT) device, a device for enhanced machine-type communication (eMTC), e.g., due to its lower hardware complexity and / or lower costs, and / or smaller form factors. Additionally, a communication between the wireless device and the radio node may not be controlled by a Radio Resource Control (RRC) layer. Particularly, a Hybrid Automated Repeat Request (HARQ) procedure may not be deployed or deployable for the communication between the wireless device and the radio node.

[0050] The wireless device may be arranged on or part of

[0051] an environmental sensor, e.g., deployed in smart buildings, industrial facilities, and urban infrastructure to enable environmental monitoring and control,R. 418041

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[0053] a smart home device to enable remote monitoring and control of home environments for energy efficiency, security, and convenience, a wearable health and / or fitness tracker to enable personal health and fitness tracking, as well as remote patient monitoring in healthcare applications,

[0054] an asset tracking device to enable monitoring the location and status of assets, vehicles, and inventory in logistics, transportation, and supply chain management applications,

[0055] an industrial loT sensor and / or actuator to enable monitoring and controlling machinery, equipment, and processes,

[0056] a smart agriculture device to enable optimizing resource usage and improving crop yields,

[0057] a smart city infrastructure unit to enable smart street lighting, traffic monitoring, waste management, public safety, and environmental monitoring.

[0058] The re-transmission information can be understood as a “mini-paging” information or message which is independent from a re-transmission request generated by the core net In contrast, the re-transmission information is preferably generated independently of the core net, specifically by a radio node such as a reader of an A-loT device. In other words, the re-transmission information may be a message to page one or multiple devices for retransmissions) of failed data unit(s) such as one or multiple segments of a segmented data packet, a whole data packet, or a message.

[0059] The re-transmission information may be generated and / or transmitted in case at least one failed data unit is detected. Alternatively, the re-transmission information may be generated and / or transmitted in case the number of failed data units is greater than or equal to a failure threshold. A failure may be detected if a data unit is not received within a defined period, e.g., counted with help of a timer. The timer may be initiated based on the allocation of radio resources for the data transmission from the wireless device to the radio node.

[0060] The proposed solution reduces latency and improves resource efficiency in A-loT networks by enabling the base station or relay to request re-transmission of only failed data segments. This targeted re-transmission approach minimizesR. 418041

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[0062] bandwidth usage, conserves power for A-loT devices, and simplifies error handling procedures.

[0063] According to an embodiment of the first aspect, the re-transmission information is transmitted prior to receiving, by the radio node, a subsequent paging message. Alternatively stated, the re-transmission information is transmitted independently from a potential subsequent paging message. In other words, the re-transmission information is transmitted in an interval between two subsequently transmitted paging messages. By transmitting the re-transmission information before the next paging message, this embodiment reduces latency and improves efficiency by enabling quicker re-transmission of lost data units without waiting for the next scheduled paging round.

[0064] According to an embodiment of the first aspect, the method further comprises:

[0065] Receiving, by the radio node, a subsequent paging message, wherein the re-transmission information is inserted or integrated, by the radio node, into the subsequent paging message.

[0066] That is, the subsequent paging message is supplemented by the re-transmission information. This embodiment improves efficiency by combining the retransmission request with the subsequent paging message, reducing signaling overhead and simplifying the communication process.

[0067] According to an embodiment of the first aspect, the re-transmission information and the subsequent paging message are transmitted in a current or a subsequent access round. The re-transmission information and the subsequent paging message may be transmitted at the beginning of the next access round. Transmitting the re-transmission information and subsequent paging message together, either in the current or next access round, streamlines communication and reduces latency by enabling immediate or near-immediate action on the retransmission request.

[0068] According to an embodiment of the first aspect, the method further comprises:

[0069] Receiving, by the radio node, a subsequent paging message, wherein the re-transmission information is transmitted in a current access round and the subsequent paging message is transmitted in a subsequent access round.R. 418041

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[0071] The subsequent paging message may be transmitted at the beginning of the next access round. Prioritizing the re-transmission information by sending it in the current access round minimizes latency for critical data re-transmission.

[0072] According to an embodiment of the first aspect, the method further comprises:

[0073] Receiving, by the radio node, a configuration information, wherein the configuration information indicates that the transmission of the retransmission information to the wireless device is enabled or disabled. In other words, the configuration information is an enablement information for activating or deactivating the transmission of the re-transmission information.

[0074] The configuration information may be received from a base station, a core network node, or an application / from higher layers. The configuration information may be contained in a downlink control information (DCI), a Radio Resource Control (RRC) signaling for connection (re-)establishment between the base station and the user equipment, a system integration block (SIB), a MAC control element (MAC CE), or an application layer message. Providing a configurable enable / disable mechanism for the re-transmission information allows for flexible A-loT network management and optimization, adapting to varying network conditions and A-loT use case requirements.

[0075] According to an embodiment of the first aspect, the failed transmission is detected by the radio node, or an intermediate radio node connecting the radio node with the core network node. The intermediate radio node may be a base station, a UE, a relay, a IAB node. For instance, the radio node may be a UE configured as a reader for A-loT devices and the intermediate radio node may be a base station. Enabling failure detection by either the radio node or an intermediate node provides flexibility and robustness, allowing for quicker identification of transmission failures and faster initiation of re-transmissions.

[0076] According to an embodiment of the first and / or the second aspect, the data unit is part of a data packet which is divided, by the wireless device, into a set of segmented data units, and wherein the re-transmission information indicates that only a subset of the segmented data units is to be re-transmitted. By segmenting data packets and allowing for re-transmission of only the lost segments, thisR. 418041

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[0078] embodiment minimizes re-transmission overhead, saving bandwidth and power, especially beneficial for resource-constrained A-loT devices.

[0079] According to an embodiment of the first and / or the second aspect, the retransmission information contains at least one of

[0080] an identification information indicating the data unit(s) to be retransmitted,

[0081] a counter indicating a number of most recently transmitted, consecutive data units to be re-transmitted,

[0082] a resource information indicating radio resources allocated to the wireless device for the re-transmission,

[0083] a random access type information indicating a type of a random access procedure to be performed, by the wireless device, to access the channel for the re-transmission,

[0084] an access round information indicating an access round for the retransmission,

[0085] a reception information identifying the successfully received data unit(s), an identification information of a most recently successfully received data unit,

[0086] a re-transmission indicator indicating that the re-transmission information is not part of a paging information provided by the core network node. The identification information comprises an ID or any other suitable identifier to indicate the failed data unit or failed set of data units for re-transmission.

[0087] The counter indicates the number of most recently transmitted data units to be re-transmitted (e.g., a value of 5 indicates the last 5 data units).

[0088] The resource information may indicate time and / or frequency radio resources for re-transmitting the data unit(s). This information may comprise a resource index. More resources may be allocated to devices with a higher number of failed transmissions, while fewer resources may be allocated to devices with lower numbers of failed transmissions.

[0089] The random access type information may specify a type of random access procedure the wireless device should employ (e.g., 2-step, 3-step, or other defined procedures). A numerical value or specific identifier could represent eachR. 418041

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[0091] random access type. The wireless device's random channel access type for retransmission of a failed data unit may differ from that used for initial transmission of other data units. For example, the re-transmission can be contention-free and a new transmission can be contention based.

[0092] The access round information specifies when the failed data unit(s) should be retransmitted. This may be indicated using a flag or other mechanism, and can designate a current access round, a next access round, or a specific future access round.

[0093] The reception information may comprise an identifier or a set of identifiers to indicate the successfully received data unit(s).

[0094] The identification information for the last successfully received data unit may comprise an ID or other identifier. This identifies, for example, the last correctly received segment.

[0095] A re-transmission indicator, such as a flag, distinguishes the re-transmission information from core network paging information. Preferably, the re-transmission indicator identifies the message as a mini-paging message.

[0096] Incorporating fields for identifying failed data units, specifying re-transmission resources, channel access and timing and confirming successful reception enables efficient and targeted re-transmission of lost data, minimizing overhead and latency in A-loT networks.

[0097] According to a further aspect of the invention, there is provided a (wireless) communication network comprising at least a (radio) node according to the third aspect, or its embodiments, and at least one wireless device, preferably at least one A-loT device, according to the fourth aspect, or its embodiments.

[0098] According to a further aspect of the invention, there is provided a method of operating the communication network. The method of operating the communication network comprises the steps of the method according to the first aspect, or its embodiments, and the steps of the method according to the second aspect, or its embodiments.R. 418041

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[0100] The non-transitory computer readable medium is preferably configured to store the computer program to be executed by a processor of the first LAN element and / or the second LAN element and / or the communication network. The non-transitory computer readable media may include RAM, ROM, EEPROM, and any other non-volatile storage device.

[0101] Description of the figures

[0102] Exemplary embodiments of the present invention are depicted in the figures, which are not to be construed as limiting the claims, and are explained in greater detail below.

[0103] Fig. 1 schematically illustrates a communication network according to an embodiment of the invention; and

[0104] Fig. 2A,B,C schematically illustrate methods according to embodiments of the invention.

[0105] Fig. 1 schematically illustrates a communication network 10 according to an aspect of the invention. The communication network 10 is configured as a cellular communication network 10, preferably according to 3GPP specifications, e.g., a 5G, or 6G communication network.

[0106] The communication network 10 comprises a core network 12 with at least one core network node 14. Further, the communication network 10 comprises a first radio node 16, e.g., a base station 16, a second radio node 18, e.g., a user equipment 18, and a group 20 of wireless devices 20a, 20b, 20c, configured as ambient Internet of Things, A-loT, devices 20a, 20b, 20c, specifically according to 3GPP specifications.

[0107] For indicating A-loT device(s) 20a, 20b, 20c that need to access a random channel and / or to transmit (payload) data, the core network node 14 is adapted, to generate an A-loT paging message regarding at least one of the A-loT devices 20a, 20b, 20c. The core network node 14 is further adapted, to transmit theR. 418041

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[0109] generated paging message to the base station 16. The base station 16 is adapted, to receive the transmitted paging message.

[0110] According to a first embodiment, the base station 16 is adapted to transmit the received paging message to the at least one of the A-loT devices 20a, 20b, 20c. Here, the base station 16 is configured as a reader for the A-loT devices 20a, 20b, 20c.

[0111] According to a second embodiment, the base station 16 is adapted to transmit the received paging message to the user equipment 18. The user equipment 18 is adapted to receive the paging message and transmit it to the at least one of the A-loT devices 20a, 20b, 20c. Here, the user equipment is configured as a reader for the A-loT devices 20a, 20b, 20c.

[0112] The respective A-loT device 20a, 20b, 20c is adapted to receive the paging message. Further, the respective A-loT device 20a, 20b, 20c is adapted to transmit one or multiple data units to the respective radio unit 16, 18 in response to the received paging message. The data units may be part of a data packet, which is segmented or divided into multiple data units for the transmission to the radio node.

[0113] The respective radio unit 16, 18 is adapted to receive the one or multiple data units from the respective A-loT device 20a, 20b, 20c. The base station 16 and / or the user equipment 18 may be adapted, to detect a failed transmission of a data unit to be transmitted from the respective A-loT device 20a, 20b, 20c to the base station 16 and / or to the user equipment 18.

[0114] According to the first embodiment, the failed transmission may be detected by the base station 16. According to the second embodiment, the failed transmission may be detected by the base station 16 or the user equipment 18. An information about the detected failed transmission may be provided from the base station 16 to the user equipment 18, or vice versa.

[0115] The respective radio node 16, 18 is configured to generate and transmit a retransmission information to the respective A-loT device 20a, 20b, 20c based on the detection of or upon detecting the failed transmission of the data. Here, theR. 418041

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[0117] re-transmission information indicates at least one data unit to be re-transmitted. The respective A-loT device 20a, 20b, 20c is adapted to re-transmit the indicated data unit to the respective radio node 16, 18 based on the received retransmission information.

[0118] The re-transmission information may comprise several fields to facilitate efficient re-transmission. These fields may include, but are not limited to:

[0119] Data unit identifier: This field identifies the specific data unit(s) requiring retransmission. It may be an index, a timestamp, or any other suitable identifier. In the case of segmented data packets, this field may identify individual segments or a range of segments.

[0120] Re-transmission counter: This field indicates the number of consecutive data units to be re-transmitted, starting from the most recently transmitted data unit. For example, a value of 3 indicates that the last 3 transmitted data units should be re-transmitted.

[0121] Resource allocation information: This field provides details about the radio resources allocated for the re-transmission. It may include a resource index, time slot allocation, frequency channel assignment, or other relevant parameters. The allocated resources for re-transmission may differ from those used for the initial transmission. For instance, additional resources might be allocated to devices with a history of failed transmissions.

[0122] Access round indicator: This field specifies the timing of the re-transmission, indicating whether the A-loT device should re-transmit in the current access round, the next access round, or a specific future access round. A simple flag mechanism can be employed to convey this information.

[0123] Reception status information: This field acknowledges the successful reception of data units. It may include identifiers of correctly received data units or segments, enabling the A-loT device to avoid unnecessary re-transmissions. It may also identify the last correctly received data unit or segment.R. 418041

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[0125] Re-transmission indicator: A dedicated flag or indicator within the re-transmission information explicitly distinguishes it from regular paging messages originating from the core network. This allows the A-loT device to correctly interpret the message and perform the requested re-transmission.

[0126] The specific combination and format of these fields may vary depending on a use case, a service, and / or an application the data unit(s) are associated with. The goal is to provide sufficient information to the A-loT device to enable efficient and targeted re-transmission while minimizing overhead and latency.

[0127] Fig. 2 schematically illustrates methods according to embodiments of the invention.

[0128] Fig. 2A schematically illustrates a method 100 for transmitting, by a radio node of a communication network, a re-transmission information to a wireless device, preferably an ambient Internet of Things, A-loT, device of the communication network according to the first aspect of the invention. The communication network may be the wireless communication network 10 according to Fig. 1.

[0129] The method 100 comprises a step 110 of receiving, by the radio node, a paging message from a core network node.

[0130] The method 100 comprises a step 120 of transmitting, by the radio node, the received paging message to the wireless device.

[0131] The method 100 comprises a step 130 of transmitting, by the radio node, a retransmission information to the wireless device based on a detection of a failed transmission of a data unit to be transmitted in response to the transmitted paging message, wherein the re-transmission information indicates at least one data unit to be re-transmitted.

[0132] Fig. 2B schematically illustrates a method 200 for re-transmitting, by a wireless device, preferably an ambient Internet of Things, A-loT, device of a communication network, a data unit based on a received re-transmission information.R. 418041

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[0134] The method 200 comprises a step 210 of receiving, by the wireless device, a paging message transmitted from the radio node.

[0135] Further, the method 200 comprises a step 220 of transmitting, by the wireless device, one or multiple data units to the radio node in response to the received paging message.

[0136] Moreover, the method 200 comprises a step 230 of receiving, by the wireless device, a re-transmission information from the radio node, wherein the retransmission information indicates at least one data unit to be re-transmitted.

[0137] Besides, the method 200 comprises a step 240 of re-transmitting, by the wireless device, the at least one indicated data unit to the radio node based on the received re-transmission information.

[0138] Fig. 2C schematically illustrates a method 300 of operating a communication system according to a further aspect of the invention. Here, the communication system comprises at least one radio node, preferably a base station or a user equipment configured as a reader, and at least one A-loT device. The communication system may be the communication system 10 according to Fig. 1.

[0139] The method 300 of operating the communication system 10 comprises the methods 100, 200 according to the first and the second aspect.

[0140] The method 300 comprises a step 310 corresponding to step 110 of the method 100 of receiving, by the radio node, a paging message from a core network node.

[0141] The method 300 comprises a step 320 corresponding to step 120 of the method 100 of transmitting, by the radio node, the received paging message to the wireless device.

[0142] The method 300 comprises a step 330 corresponding to step 210 of the method 200 of receiving, by the wireless device, a paging message transmitted from the radio node.R. 418041

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[0144] The method 300 comprises a step 340 corresponding to step 220 of the method 200 of transmitting, by the wireless device, one or multiple data units to the radio node in response to the received paging message.

[0145] The method 300 comprises a step 350 corresponding to step 130 of the method 100 of transmitting, by the radio node, a re-transmission information to the wireless device based on a detection of a failed transmission of a data unit to be transmitted in response to the transmitted paging message, wherein the retransmission information indicates at least one data unit to be re-transmitted.

[0146] The method 300 comprises a step 360 corresponding to step 230 of the method 200 of receiving, by the wireless device, the re-transmission information from the radio node.

[0147] The method 300 comprises a step 370 corresponding to step 240 of the method 200 of re-transmitting, by the wireless device, the at least one indicated data unit to the radio node based on the received re-transmission information.

[0148] The method 300 may be performed by the communication system 10, specifically by the at least one radio node 16 and the at least one A-loT device 20a, 20b, 20c.

Claims

R. 418041- 17 -Claims1. A method (100) for transmitting, by a radio node (16, 18) of a communication network (10), a re-transmission information to a wireless device (20; 20a, 20b, 20c), preferably an ambient Internet of Things, A-loT, device (20; 20a, 20b, 20c) of the communication network (10), comprising:Receiving (110), by the radio node (16, 18), a paging message from a core network node (14);Transmitting (120), by the radio node (16, 18), the received paging message to the wireless device (20; 20a, 20b, 20c); andTransmitting (130), by the radio node (16, 18), a re-transmission information to the wireless device (20; 20a, 20b, 20c) based on a detection of a failed transmission of a data unit to be transmitted in response to the transmitted paging message, wherein the re-transmission information indicates at least one data unit to be re-transmitted.

2. The method (100) according to claim 1 , wherein the re-transmission information is transmitted prior to receiving, by the radio node (16, 18), a subsequent paging message.

3. The method (100) according to one of the preceding claims, further comprising:Receiving, by the radio node (16, 18), a subsequent paging message, wherein the re-transmission information is inserted, by the radio node (16, 18), into the subsequent paging message.

4. The method (100) according to claim 3, wherein the re-transmission information and the subsequent paging message are transmitted in a current or a subsequent access round.

5. The method (100) according to claim 1 or 2, further comprising:Receiving, by the radio node (16, 18), a subsequent paging message, wherein the re-transmission information is transmitted in a current accessR. 418041- 18 -round and the subsequent paging message is transmitted in a subsequent access round.

6. The method (100) according to one of the preceding claims, further comprising:Receiving, by the radio node (16, 18), a configuration information, wherein the configuration information indicates that the transmission of the re-transmission information to the wireless device (20; 20a, 20b, 20c) is enabled or disabled.

7. The method (100) according to one of the preceding claims, wherein the failed transmission is detected by the radio node (16, 18), or an intermediate radio node (16, 18) connecting the radio node (16, 18) with the core network node (14).

8. A method (200) for re-transmitting, by a wireless device (20; 20a, 20b, 20c), preferably an ambient Internet of Things, A-loT, device (20; 20a, 20b, 20c) of a communication network (10), a data unit based on a received retransmission information, comprising:Receiving (210), by the wireless device (20; 20a, 20b, 20c), a paging message transmitted from the radio node (16, 18);Transmitting (220), by the wireless device (20; 20a, 20b, 20c), one or multiple data units to the radio node (16, 18) in response to the received paging message;Receiving (230), by the wireless device (20; 20a, 20b, 20c), a retransmission information from the radio node (16, 18), wherein the retransmission information indicates at least one data unit to be retransmitted; andRe-transmitting (240), by the wireless device (20; 20a, 20b, 20c), the at least one indicated data unit to the radio node (16, 18) based on the received re-transmission information.

9. The method(s) (100, 200) according to one of the preceding claims, wherein the data unit is part of a data packet which is divided, by the wireless device (20; 20a, 20b, 20c), into a set of segmented data units, and wherein the re-R. 418041- 19 -transmission information indicates that only a subset of the segmented data units is to be re-transmitted.

10. The method(s) (100, 200) according to one of the preceding claims, wherein the re-transmission information contains at least one ofan identification information indicating the data unit(s) to be retransmitted,a counter indicating a number of most recently transmitted, consecutive data units to be re-transmitted,a resource information indicating radio resources allocated to the wireless device (20; 20a, 20b, 20c) for the re-transmission,a random access type information indicating a type of a random access procedure to be performed, by the wireless device (20; 20a, 20b, 20c), to access a channel for the re-transmission,an access round information indicating an access round for the retransmission,a reception information identifying the successfully received data unit(s), an identification information of a most recently successfully received data unit,a re-transmission indicator indicating that the re-transmission information is not part of a paging information provided by the core network node (14).

11. A node (16, 18) of a communication network (10) adapted to execute the method (100) according to one of claims 1 to 7, 9, or 10.

12. A wireless device (20; 20a, 20b, 20c), preferably an ambient Internet of Things, A-loT, device (20; 20a, 20b, 20c), of a communication network (10) adapted to execute the method (200) according to one of claims 8 to 10.

13. A computer program comprising machine-readable instructions to cause the node (16, 18) according to claim 11 to execute the method (100) according to one of claims 1 to 7, 9 or 10, and / orthe wireless device (20; 20a, 20b, 20c) according to claim 12 to execute the method (200) according to one of claims 8 to 10.R. 418041- 20 -14. A non-transitory computer readable medium having stored thereon the computer program according to claim 13.

15. A re-transmission message to be transmitted from a radio node (16, 18) of a communication network (10) to a wireless device (20; 20a, 20b, 20c), preferably an ambient Internet of Things, A-loT, device (20; 20a, 20b, 20c), of the communication network (10), wherein the re-transmission message comprises a data field containing at least one ofan identification information indicating one or multiple data unit(s) to be re-transmitted,a counter indicating a number of most recently transmitted, consecutive data units to be re-transmitted,a resource information indicating radio resources allocated to the wireless device for the re-transmission,a random access type information indicating a type of a random access procedure to be performed, by the wireless device (20; 20a, 20b, 20c), to access a channel for the re-transmission,an access round information indicating an access round for the retransmission,a reception information identifying the successfully received data unit(s), an identification information of a most recently successfully received data unit,a re-transmission indicator indicating that the re-transmission information is not part of a paging information provided by a core network node (14).

16. A data carrier signal carrying the computer program of claim 13 or the retransmission message according to claim 15.

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