Retransmission optimization mechanism

Abstract

Methods, systems, and devices for wireless communication are described. Some wireless communication systems may support retransmission optimization mechanisms. For example, a first network node may receive one or more signals, each of the one or more signals being received as an initial retransmission and as one or more retransmissions according to a first redundancy version (RV) index sequence. The first RV index order may specify a respective RV index for each of the initial transmission and the one or more retransmissions. The first network node may monitor the initial transmission and the one or more retransmissions to determine an error metric associated with each RV index of the first RV index order, and may send a request to send a future signal according to a second RV index order based on the monitoring.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. patent application No. 17 / 836,356, entitled “RETRANSMISSION OPTIMIZATION MECHANISMS,” filed by Lnu et al. on June 9, 2022, which is assigned to the assignee of this application. Technical Field

[0003] The following relates to wireless communications, including retransmission optimization mechanisms. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each of which supports wireless communication for a communication device, which may be referred to as a user equipment (UE). Summary of the invention

[0005] The described techniques relate to improved methods, systems, devices and apparatuses that support retransmission optimization mechanisms. In general, the techniques described herein allow a first network node (such as a user equipment (UE)) to monitor signals (such as downlink signals) transmitted according to a first redundancy version (RV) index order and, based on the monitoring, to send a request to a second network node (such as a network entity) to transmit future signals according to a second RV index order. In other examples, the first network node may be a network entity (such as a base station) and the second network node may be a UE. For example, the first network node may receive one or more signals from the second network node, wherein each of the signals is received as an initial transmission and one or more retransmissions according to a first RV index order. The first RV index order may specify a corresponding RV index for each of the initial transmission and the one or more retransmissions, and in some cases may include self-decodable and non-self-decodable RV indexes. The first network node may monitor the initial transmission and the one or more retransmissions of each signal to determine an error metric associated with each RV index order from the first RV index order. For example, the first network node may determine a first block error rate (BLER) associated with a first RV index of the first RV index order and a second BLER associated with a second RV index of the first RV index order. In some cases, the first network node may compare error metrics associated with each RV index order. For example, the first network node may compare the first BLER associated with the first RV index order and the second BLER associated with the second RV index order. Additionally, the first network node may send a request for the second network node to send future signals according to the second RV index order based on the comparison. For example, the first network node may determine that the first BLER associated with the first RV index is greater than the second BLER associated with the second RV index, and may send the request based on the first BLER being greater than the second BLER. In some cases, the second RV index order may include self-decodable RV indexes.

[0006] A method is described. The method may include: receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for the initial transmission and each of the one or more retransmissions; monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order; and sending a request for the second network node to send future signals according to a second RV index order based on the monitoring.

[0007] An apparatus is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to: receive one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions; monitor the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order; and send a request for the second network node to send future signals according to a second RV index order based on the monitoring.

[0008] Another apparatus is described. The apparatus may include: means for receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for the initial transmission and each of the one or more retransmissions; means for monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order; and means for sending a request for the second network node to send future signals according to a second RV index order based on the monitoring.

[0009] A non-transitory computer-readable medium storing code is described. The code may include instructions executable by a processor to: receive one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for the initial transmission and each of the one or more retransmissions; monitor the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order; and send a request for the second network node to send future signals according to a second RV index order based on the monitoring.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, monitoring the initial transmission and the one or more retransmissions of each of the one or more signals may include operations, features, components, or instructions for performing the following actions: monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine a first error metric associated with a first RV index of the first RV index sequence and a second error metric associated with a second RV index of the first RV index sequence; and comparing the first error metric associated with the first RV index and the second error metric associated with the second RV index, wherein sending the request may be based at least in part on the comparison.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following actions: determining that the first error metric associated with the first RV index may be less than the second error metric associated with the second RV index, wherein sending the request may be based on the determination.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, monitoring the initial transmission and the one or more retransmissions of each of the one or more signals may include operations, features, components, or instructions for performing the following actions: monitoring the initial transmission and the one or more retransmissions of each of the one or more signals during a duration associated with a timer to determine an error metric associated with each RV index of the first RV index order, wherein sending the request may be based on expiration of the timer.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the one or more signals may include operations, features, components, or instructions for performing the following actions: receiving the one or more signals, each of the one or more signals being received as the initial transmission and as the one or more retransmissions according to the first RV index order, wherein the first RV index order includes self-decodable RVs, non-self-decodable RVs, or both.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first RV index order includes an RV index order of 0, 2, 3, and then 1.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the request may include operations, features, components, or instructions for performing the following actions: sending the request for the second network node to send the future signals according to the second RV index order, wherein the second RV index order includes self-decodable RVs.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, monitoring the initial transmission and the one or more retransmissions of each of the one or more signals may include operations, features, components, or instructions for performing the following actions: measuring the BLER of the initial transmission and the one or more retransmissions, wherein the error metric associated with each RV index of the first RV index order may be based on the measurement.

[0017] Some examples of the methods, apparatus, and non-transitory computer readable media described herein may also include operations, features, means, or instructions for receiving the future signals in accordance with the second RV index order.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second RV index order includes an RV index order of 0, 3, 0, then 3.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the request may include operations, features, components, or instructions for performing the following actions: sending the request for the second network node to send the future signals in accordance with the second RV index order via uplink control information or a medium access control-control element.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first network node communicates via a non-terrestrial network or using ultra-low reliability low latency communications.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first RV index order may be based on one or more parameters at the first network node.

[0022] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for receiving a second control message indicating the first RV index order.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing the following actions: failing to decode the initial transmission; and sending a feedback message including an indication that the first network node failed to decode the initial transmission, wherein receiving the one or more retransmissions may be based on the feedback message.

[0024] A method for wireless communication at a second network node is described. The method may include: sending one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for the initial transmission and each of the one or more retransmissions; receiving a request from the second network node to send future signals according to a second RV index order; and sending the future signals according to the second RV index order.

[0025] An apparatus for wireless communication at a second network node is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: transmit one or more signals, each of the one or more signals being transmitted as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for the initial transmission and each of the one or more retransmissions; receive a request from the second network node to transmit future signals according to a second RV index order; and transmit the future signals according to the second RV index order.

[0026] Another apparatus for wireless communication at a second network node is described. The apparatus may include: means for sending one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for the initial transmission and each of the one or more retransmissions; means for receiving a request from the second network node to send future signals according to a second RV index order; and means for sending the future signals according to the second RV index order.

[0027] A non-transitory computer-readable medium storing code for wireless communication at a second network node is described. The code may include instructions executable by a processor to: transmit one or more signals, each of the one or more signals being transmitted as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for the initial transmission and each of the one or more retransmissions; receive a request from the second network node to transmit future signals according to a second RV index order; and transmit the future signals according to the second RV index order.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the one or more signals may include operations, features, components, or instructions for performing the following actions: sending the one or more signals, each of the one or more signals being sent as the initial transmission and as the one or more retransmissions according to the first RV index sequence, wherein the first RV index sequence includes self-decodable RVs, non-self-decodable RVs, or both.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first RV index order includes an RV index order of 0, 2, 3, and then 1.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the request may include operations, features, components, or instructions for performing the following actions: receiving the request for the second network node to send the future signals according to the second RV index order, wherein the second RV index order includes self-decodable RVs.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second RV index order includes an RV index order of 0, 3, 0, then 3.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the request may include operations, features, components, or instructions for performing the following actions: receiving the request for the second network node to send the future signals in accordance with the second RV index order via uplink control information or a medium access control-control element.

[0033] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second network node communicates via a non-terrestrial network or using ultra-low reliability low latency communications.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first RV index order may be based on one or more parameters at the first network node.

[0035] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for sending a second control message indicating the first RV index order.

[0036] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a feedback message including an indication that the first network node failed to decode the initial transmission, wherein sending the one or more retransmissions may be based on the feedback message. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 An example of a wireless communication system supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is illustrated.

[0038] Figure 2 An example of a wireless communication system supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is illustrated.

[0039] Figure 3 An example of a process flow supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is illustrated.

[0040] Figure 4 and Figure 5 A block diagram of a device supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown.

[0041] Figure 6 A block diagram of a communication manager supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown.

[0042] Figure 7 A diagram of a system including a device supporting a retransmission optimization mechanism in accordance with one or more aspects of the present disclosure is shown.

[0043] Figure 8 and Fig. 9 A block diagram of a device supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown.

[0044] Fig.10 A block diagram of a communication manager supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown.

[0045] Fig.11 A diagram is shown of a system including a device supporting a retransmission optimization mechanism in accordance with one or more aspects of the present disclosure.

[0046] Figure 12 to Figure 14 A flow chart illustrating a method of supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0047] Some wireless communication systems (e.g., non-terrestrial networks (NTNs) or ultra-reliable low-latency communication (URLLC) systems) may experience propagation delays. For example, a first network node such as a user equipment (UE) may experience propagation delays due to the distance between the UE and a second network node such as a network entity (e.g., a satellite entity) communicating with the UE. In some cases, based on the UE's failure to decode a downlink transmission from the network entity, the propagation delay between the UE and the network entity may increase. In other words, the UE may fail to decode an initial transmission of a downlink signal and may receive one or more retransmissions of the downlink signal, wherein each of the one or more retransmissions is associated with an additional propagation delay that may negatively impact performance. Similarly, a network entity (such as a base station) may fail to decode an initial transmission of an uplink signal from the UE and may receive one or more retransmissions of the uplink signal, each of which is also associated with an additional propagation delay.

[0048] The techniques described herein may support a retransmission optimization mechanism that may reduce propagation delay. In some cases, a first network node (such as a UE) may receive one or more signals (such as downlink signals) from a second network node (such as a network entity), wherein each signal is received as an initial transmission and one or more retransmissions, and each transmission is associated with a redundancy version (RV) index. In addition, the initial transmission and one or more retransmissions associated with each signal may be sent according to a first RV index order. For example, the UE may receive an initial transmission of a downlink signal with an RV index of 0, and may receive subsequent retransmissions of downlink signals with RV indices of 2, 3, and 1 (in that order). The UE may monitor the initial transmission and one or more retransmissions of each downlink signal (e.g., during a duration associated with a timer) to determine an error metric associated with each RV index from the first RV index order, such as a block error rate (BLER). In some cases, the UE may compare the error metrics associated with each RV index, and may send a request to the network entity based on the comparison to send future downlink signals according to a second (e.g., new) RV index order. The network entity may receive the request and send future downlink signals according to the second RV index order, which may reduce propagation delay.

[0049] In some cases, the first network node may be a network entity and the second network node may be a UE. In such cases, the network entity may receive one or more uplink signals from the UE, wherein each uplink signal is received as an initial transmission and one or more retransmissions, and each transmission is associated with an RV index and is transmitted according to a first RV index order. The network entity may perform a process similar to that previously described, wherein the network entity monitors the initial transmission and one or more retransmissions of each uplink signal to determine an error metric associated with each RV index from the first RV index order. Additionally, the network entity may compare the error metrics associated with each RV index, and may send a request to the UE to send future uplink signals according to a second RV index order based on the comparison. The UE may receive the request and send future uplink signals according to the second RV index order, which may reduce propagation delay.

[0050] Aspects of the present disclosure are first described in the context of a wireless communication system. Aspects of the present disclosure are then described in the context of a process flow. Aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow diagrams related to a retransmission optimization mechanism.

[0051] Figure 1 An example of a wireless communication system 100 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, a new radio (NR) network, or a network operating according to other systems and radio technologies (including future systems and radio technologies not explicitly mentioned herein).

[0052] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may include devices in different forms or with different capabilities. In various examples, the network entity 105 may be referred to as a network node, a network element, a mobility element, a radio access network (RAN) node, or other names such as network equipment. In some examples, the network entity 105 and the UE 115 may communicate wirelessly via one or more communication links 125 (e.g., a radio frequency (RF) access link). For example, the network entity 105 may support a coverage area 110 (e.g., a geographic coverage area), and the UE 115 and the network entity 105 may establish one or more communication links 125 over the coverage area. The coverage area 110 may be an example of a geographic area, and the network entity 105 and the UE 115 may support signal communication over the geographic area according to one or more radio access technologies (RATs).

[0053] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1 . The UEs 115 described herein can communicate with various types of devices, such as Figure 1 Communicate with other UEs 115 or network entities 105) as shown.

[0054] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as nodes. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from a second node.

[0055] In some examples, the network entities 105 may communicate with the core network 130, or with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, the network entities 105 may communicate with each other directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130) via the backhaul communication link 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, the network entities 105 may communicate with each other via the midhaul communication link 162 (e.g., according to the midhaul interface protocol) or the fronthaul communication link 168 (e.g., according to the fronthaul interface protocol) or any combination thereof. The backhaul communication link 120, the midhaul communication link 162, or the fronthaul communication link 168 may be or include one or more wired links (e.g., electrical links, optical fiber links), one or more wireless links (e.g., radio links, wireless optical links), or other examples or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0056] One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a transceiver base station, a radio base station, an NR base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a 5G NB, a next generation eNB (ng-eNB), a Home Node B, a Home Evolved Node B, or other suitable terms). In some examples, the network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0057] In some examples, the network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmit receive point (TRP). One or more components of the network entity 105 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of the decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0058] The functional split between CU 160, DU 165, and RU 175 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, and RU 175. For example, a functional split of a protocol stack may be employed between CU 160 and DU 165 such that CU 160 may support one or more layers of a protocol stack and DU 165 may support one or more different layers of a protocol stack. In some examples, CU 160 may host higher protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functionality and signaling (e.g., radio resource control (RRC), service data adaptation protocol (SDAP), packet data convergence protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between CU 160 and DU 165 or between DU 165 and RU 170 may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by the other of CU 160, DU 165, or RU 170). CU 160 may be further functionally split into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and DU 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interface). In some examples, midhaul communication link 162 or fronthaul communication link 168 may be implemented based on interfaces (eg, channels) between layers of a protocol stack supported by respective network entities 105 communicating over those communication links.

[0059] In some wireless communication systems (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to the core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as host entities or IAB hosts. One or more DUs 165 or one or more RUs 170 may be partially controlled by one or more CUs 160 associated with a host network entity 105 (e.g., a host base station 140). One or more host network entities 105 (e.g., IAB hosts) may communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). The IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a DU 165 of a coupled IAB host. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas of the IAB node 104 (e.g., of the RU 170) for access via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0060] Where the techniques described herein are applied in the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support the retransmission optimization mechanism as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., an IAB node 104, a DU 165, a CU 160, a RU 170, a RIC 175, a SMO 180).

[0061] UE 115 may include or may be referred to as a network node, a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where "device" may also be referred to as other examples such as a unit, a station, a terminal, or a client. UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or may be referred to as other examples such as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, which may be implemented in various objects such as other examples such as electrical appliances or vehicles, meters, etc.

[0062] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as network entities 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, and other examples, such as Figure 1 shown.

[0063] The UE 115 and the network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) on one or more carriers. The term "carrier" may refer to a collection of RF spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of an RF spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between a device and any portion (e.g., entity, sub-entity) of the network entity 105. For example, the terms "send," "receive," or "communicate" when referring to the network entity 105 may refer to any portion of the network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of the RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0064] The signal waveform sent on the carrier may be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM technology, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and the subcarrier spacing may be inversely related. The amount of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), so that the more resource elements a device receives and the higher the order of the modulation scheme, the higher the data rate for the device may be. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers, beams), and the use of multiple spatial resources may increase the data rate or data integrity of communications with UE 115.

[0065] The time interval for the network entity 105 or the UE 115 may be expressed as a multiple of a basic time unit, which may be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. Time intervals of communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0066] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, the time slot may also be divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may include one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0067] A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmit time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0068] Physical channels may be multiplexed on a carrier according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a set of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of the UEs 115 may monitor or search the control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of the control channel candidate may refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with the coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to a plurality of UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0069] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and thus provide communication coverage for mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

[0070] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support URLLC. UE 115 may be designed to support ultra-reliable or low-latency or critical functions. Ultra-reliable communication may include private communication or group communication, and may be supported by one or more services (such as push-to-talk, video, or data). Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety applications or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency are used interchangeably herein.

[0071] In some examples, a UE 115 may be able to communicate directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group that are performing D2D communication may be within a coverage area 110 of a network entity 105 (e.g., a base station 140, a RU 170), which may support aspects of such D2D communication configured or scheduled by the network entity 105. In some examples, one or more UEs 115 in such a group may be outside of the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some examples, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system, in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, the network entity 105 may facilitate scheduling of resources for D2D communication. In some other examples, D2D communications may occur between UEs 115 without involving network entity 105 .

[0072] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity for managing access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity for routing packets or interconnecting to an external network (e.g., a serving gateway (S-GW)), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by a network entity 105 (e.g., a base station 140) associated with the core network 130. User IP packets may be delivered via the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to an IP service 150 for one or more network operators. IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0073] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range is approximately one decimeter to one meter. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves may be sufficient to penetrate structures so that macro cells provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using smaller frequencies and longer wavelengths in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0074] The wireless communication system 100 may utilize both licensed RF spectrum bands and unlicensed RF spectrum bands. For example, the wireless communication system 100 may use licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed RF spectrum band, devices such as the network entity 105 and the UE 115 may employ carrier sensing for conflict detection and avoidance. In some examples, operations in an unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in conjunction with component carriers operating in a licensed band. Operations in an unlicensed spectrum may include other examples such as downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions.

[0075] The network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the network entity 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may have an antenna array having a set of rows and columns of antenna ports that the network entity 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals transmitted via the antenna ports.

[0076] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals conveyed via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals conveyed via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other orientation).

[0077] UE 115 and network entity 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood of correctly receiving data through a communication link (e.g., communication link 125, D2D communication link 135). HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support simultaneous slot HARQ feedback, wherein the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In some other examples, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0078] The wireless communication system 100 may support a retransmission optimization mechanism that may reduce propagation delay. In some cases, a first network node (such as a UE 115) may receive one or more signals (such as downlink signals) from a second network node (such as a network entity 105) according to a first RV index order, wherein each signal is received as an initial transmission and one or more retransmissions, and each transmission is associated with an RV index from the first RV index order. For example, the UE 115 may receive an initial transmission of a downlink signal with an RV index of 0, and may receive subsequent retransmissions of downlink signals with RV indices of 2, 3, and 1 (in that order). The UE may monitor the initial transmission and one or more retransmissions of each downlink signal to determine an error metric, such as a block error rate (BLER), associated with each RV index from the first RV index order. In some cases, the UE 115 may compare the error metrics associated with each RV index, and may send a request to the network entity 105 to send future downlink signals according to a second RV index order based on the comparison. The network entity 105 may receive the request and send future downlink signals according to the second RV index order, which may reduce propagation delay.

[0079] In other examples, the first network node may be the network entity 105 and the second network node may be the UE 115 .

[0080] Figure 2 An example of a wireless communication system 200 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is illustrated. The wireless communication system 200 may implement aspects of the wireless communication system 100 or be implemented by these aspects. For example, the wireless communication system 200 may include a network entity 105-a and a UE 115-a. The UE 115-a may represent a wireless communication system 105-a as described herein (including references to Figure 1) as an example of a UE 115 as described herein. The network entity 105-a may represent an example of a UE 115 as described herein (including references Figure 1 ) as described above. Additionally, the network entity 105-a may send downlink signals via the communication link 205, and the UE 115-a may send uplink signals via the communication link 210. For example, the UE 115-a may send a request message 235 to the network entity 105-a, which requests the network entity 105-a to send future downlink signals according to the RV index order indicated in the request message 235.

[0081] Some wireless communication systems may support a retransmission mechanism. For example, the network entity 105 may send one or more downlink signals to the UE 115 according to an RV index order (e.g., RV 0, RV 2, RV 3, RV 1), wherein the RV index order indicates that the network entity 105 may send an initial transmission of a downlink signal and an order of one or more retransmissions of the downlink signal based on the RV index associated with each transmission. In other words, the network entity 105 may send an initial transmission of a downlink signal according to a first RV index based on the RV index order, and send each retransmission of the downlink signal according to a corresponding RV index. Each RV index may indicate to the UE 115 the amount of redundancy added to the codeword associated with the transmission when encoding. A transmission associated with a self-decodable RV (e.g., a transmission associated with a self-decodable RV index such as RV 0 and RV 3) may include all system information bits of the associated downlink signal, so that the UE 115 may decode the transmission without using information from other transmissions of the downlink signal (e.g., the UE 115 may decode the transmission independently). Transmissions associated with non-self-decodable RVs (e.g., transmissions associated with non-self-decodable RV indices such as RV 2 and RV 1) may include a subset of system information bits of the associated downlink signal such that the UE 115 may use information stored from a previous transmission of the downlink signal to decode the non-self-decodable transmission (e.g., the UE 115 is unable to independently decode the transmission). In other words, the UE 115 may fail to decode the transmission of the downlink signal with the self-decodable RV index, and may store a subset of packets associated with the transmission of the downlink signal such that the UE 115 may use the subset of packets when attempting to decode future retransmissions of the downlink signal with the non-self-decodable RV index.

[0082] For example, UE 115 may receive an initial transmission (including packets) of a downlink signal having an RV index of 0 (e.g., self-decodable) from network entity 105, and may fail to decode the initial transmission. However, UE 115 may store (e.g., in a buffer) a subset of packets that UE 115 is able to decode. In some cases, network entity 105 may send a first retransmission of a downlink signal having an RV index of 2 (e.g., non-self-decodable) based on the RV index order. UE 115 may attempt to decode the first retransmission using the stored subset of packets. In some cases, UE 115 may fail to decode the first retransmission, and network entity 105 may send a second retransmission of a downlink signal having an RV index of 3 (e.g., self-decodable) based on the RV index order, and UE 115 may attempt to decode the second retransmission (e.g., without using the stored packets from the previous transmission). In some cases, the UE 115 may fail to decode the second retransmission, and the network entity 105 may continue to send retransmissions of the downlink signal according to the RV index order.

[0083] Additionally, some wireless communication systems (e.g., NTN or URLLC systems) may experience propagation delays, which may increase in some cases due to conventional retransmission mechanisms. For example, UE 115 may communicate with network entity 105 such as a satellite entity via an NTN communication system, and experience a propagation delay greater than 100ms (e.g., 238-541ms for geosynchronous equatorial orbit (GEO) satellite entity and 4–25ms for low earth orbit (LEO) satellite entity) due to the proximity of UE 115 to network entity 105. In some cases, UE 115 may fail to receive an initial transmission from network entity 105, and may send a feedback message (e.g., HARQ) indicating a failed transmission to network entity 105, which may increase the propagation delay between UE 115 and network entity 105 (e.g., network entity 105 may wait to receive a feedback message before sending one or more retransmissions of a downlink signal). In some cases, UE 115 may disable the transmission of feedback messages or employ feedback optimization techniques to reduce propagation delays. However, the current techniques may not be effective when the UE 115 fails to decode the initial transmission and / or one or more retransmissions. For example, the network entity 105 may send an initial transmission of a downlink signal, wherein the initial transmission is associated with a self-decodable RV index (e.g., RV 0) and is sent according to the RV index order. The UE 115 may fail to receive or decode the initial transmission, and the network entity 105 may send a first retransmission of the downlink signal according to the RV index order (e.g., on the order of 100 ms later), wherein the first retransmission is associated with a non-self-decodable RV index (e.g., RV 2). In some cases, the UE 115 may fail to decode the first retransmission, and the network entity may send a second retransmission of the downlink signal according to the RV index order (e.g., on the order of 100 ms later), wherein the second transmission is associated with a self-decodable RV index (e.g., RV 3). In such cases, UE 115 may decode the second retransmission with a high probability (e.g., it is likely that UE 115 will be able to decode the second retransmission based on the self-decodable RV index). Therefore, due to the UE 115 being unable to receive or decode the first transmission associated with the non-self-decodable RV and being unable to successfully receive and decode the second retransmission associated with the self-decodable RV index, UE 115 (e.g., operating in a delay-constrained scenario) may experience increased propagation delay (e.g., upon failing to receive or decode the initial transmission of the downlink signal, UE 115 may have to wait for a retransmission of the downlink signal associated with the self-decodable RV, which may be based on the RV index order).

[0084] The techniques described herein may support a retransmission optimization mechanism that may reduce propagation delay and reduce power consumption. In some cases, UE 115-a may receive one or more downlink signals (such as downlink signal 215) from network entity 105-a, wherein downlink signal 215 is received as an initial transmission (such as downlink signal 215-a) and one or more retransmissions (such as downlink signal 215-b, downlink signal 215-c, and downlink signal 215-d). Additionally, UE 115-a may receive downlink signal 215-a, downlink signal 215-b, downlink signal 215-c, and downlink signal 215-d according to RV index order 220-a. In other words, UE 115-a can receive a downlink signal 215-a having an RV index 225-a (e.g., RV 0), a downlink signal 215-b having an RV index 225-b (e.g., RV2), a downlink signal 215-c having an RV index 225-c (e.g., RV 3), and a downlink signal 215-d having an RV index 225-d based on the RV index order 220-a (e.g., RV1).

[0085] In some cases, the UE 115-a may monitor one or more downlink signals including the downlink signal 215 to determine an error metric, such as a BLER, associated with each RV index 225. For example, the UE 115-a may determine a BLER associated with the RV index 225-b and a BLER associated with the RV index 225-c. In some cases, the UE 115-a may monitor the one or more downlink signals to determine the error metric based on a timer. In other words, the UE 115-a may start a timer and monitor the transmission of one or more downlink signals during a duration (e.g., on the order of 100 ms) associated with the timer, and may determine the BLER associated with each RV index 225 during the duration. For example, the UE 115-a may determine the BLER of each transmission of a downlink signal (such as the downlink signal 215-b) associated with the RV index 225-b, and determine an average BLER associated with the RV index 225-b based on the BLER of each transmission (e.g., when the timer expires).

[0086] In some cases, the UE 115-a may compare the BLER associated with each RV index 225 and may send a request message 235 based on the comparison (e.g., via a UCI or a MAC CE) requesting the network entity 105-a to send future downlink signals (such as the downlink signal 230) according to the RV index order 220-b (e.g., using the self-decodable RV index 225). For example, the UE 115-a may determine that the BLER associated with the RV index 225-b is greater than the BLER associated with the RV index 225-c, and may send the request message 235 based on the BLER associated with the RV index 225-b being greater than the BLER associated with the RV index 225-c.

[0087] The network entity 105-a may receive the request message 235 and send future downlink signals (such as the downlink signal 230) according to the RV index order 220-b. For example, the downlink signal 230-a may be an initial transmission of the downlink signal 230, and the network entity 105-a may send the downlink signal 230-a with an RV index 225-e based on the RV index order 220-b. Additionally, the network entity 105-a may send a downlink signal 230-b with an RV index 225-f (e.g., a first retransmission of the downlink signal 230), a downlink signal 230-c with an RV index 225-g (e.g., a second retransmission of the downlink signal 230), and a downlink signal 230-d with an RV index 225-h (e.g., a third retransmission of the downlink signal 230) based on the RV index order 220-b requested by the UE 115-a. In some cases, RV index 225-e may be the same as RV index 225-g (e.g., RV 0), and RV index 225-f may be the same as RV index 225-h (e.g., RV 3). Additionally, RV index 225-e may be the same as RV index 225-a, and RV index 225-f may be the same as RV index 225-c.

[0088] Although much of the present disclosure is described in the context of downlink signaling between UE 115-a and network entity 105-a, this should not be viewed as limiting the present disclosure. In fact, it is contemplated herein that a first network node (such as UE 115-a) may receive a signal (such as downlink signal 230) from a second network node (such as network entity 105-a). In this regard, uplink signals may be considered with respect to the techniques described herein. In other words, network entity 105 (which may be an example of a first network node) may receive an uplink signal (which may be an example of a signal) from UE 115 (which may be an example of a second network node), and the techniques described herein may be employed to support a retransmission optimization mechanism.

[0089] Figure 3 An example of a process flow 300 for supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is illustrated. The process flow 300 may implement or be implemented by aspects of the wireless communication system 100 and the wireless communication system 200. For example, the process flow 300 may include a network entity 105-b and a UE 115-b. The UE 115-b may represent a wireless communication device as described herein (including references to Figure 1 ) as an example of a UE 115 as described herein. The network entity 105-b may represent an example of a UE 115 as described herein (including references Figure 1 ) is an example of a network entity 105 described in the accompanying drawings. In some cases, UE 115-b may send a request to the network entity 105-b to send future downlink signals according to the requested RV index order.

[0090] In some cases, at 305, a first network node (such as UE 115-b) may receive a control message indicating a first RV index order (e.g., RV 0, RV 2, RV 3, RV 1) from a second network node (such as network entity 105-b), wherein the first RV index order includes self-decodable RVs (e.g., RV indexes), non-self-decodable RVs, or both. Alternatively, the first RV index order may be based on one or more parameters at UE 115-b (e.g., the first RV index order may be pre-configured at UE 115-b). Additionally, UE 115-b may communicate with network entity 105-b via NTN, using URLLC communication, or both.

[0091] At 310, the network entity 105-b may transmit one or more signals (such as downlink signals), each of the one or more downlink signals being transmitted as an initial transmission and as one or more retransmissions according to a first RV index order. The first RV index order may specify (e.g., assign) an RV index for each of the initial transmission and the one or more retransmissions.

[0092] For example, UE 115-b may fail to decode an initial transmission of a downlink signal associated with a first RV index and may send a feedback message to network entity 105-b indicating that the UE failed to decode the initial transmission. Network entity 105-b may receive the feedback message and may send a first retransmission of a downlink signal that may be associated with a second RV index in accordance with the first RV index sequence.

[0093] At 315, UE 115-b may monitor the initial transmission and the one or more retransmissions of each of the one or more downlink signals to determine an error metric associated with each RV index of the first RV index order. In some cases, UE 115-b may monitor the initial transmission and the one or more retransmissions of each of the one or more downlink signals during a duration associated with a timer (e.g., which may be indicated in a control message or may be preconfigured at UE 115-b).

[0094] For example, at 320, UE 115-a may monitor an initial transmission and one or more retransmissions of each of the one or more downlink signals to determine a first error metric associated with a first RV index of a first RV index order and a second error metric associated with a second RV index of the first RV index order. In some cases, UE 115-b may determine the error metric by measuring the BLER of the initial transmission and the one or more retransmissions. Additionally, at 325, UE 115-b may compare the first error metric with the second error metric and may determine that the first error metric is less than the second error metric.

[0095] At 330, a request (e.g., a request message) may be sent based on monitoring (e.g., via UCI or MAC-CE) for the network entity 105-b to send future downlink signals according to a second RV index order (e.g., RV 0, RV 3, RV 0, RV 3). In some cases, the UE 115-b may send the request upon expiration of a timer. Additionally, the second RV index order may include self-decodable RVs (e.g., RV indices).

[0096] At 335, the network entity 105-b may send future downlink signals according to the second RV index order based on the request.

[0097] Figure 4 A block diagram 400 of a device 405 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. The device 405 may be an example of aspects of a first network node (such as a UE 115 or a network entity 105) as described herein. The device 405 may include a receiver 410, a transmitter 415, and a communication manager 420. The device 405 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0098] Receiver 410 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to retransmission optimization mechanisms), user data, control information, or any combination thereof. The information may be communicated to other components of device 405. Receiver 410 may utilize a single antenna or a set of multiple antennas.

[0099] Transmitter 415 may provide means for transmitting signals generated by other components of device 405. For example, transmitter 415 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to retransmission optimization mechanisms), user data, control information, or any combination thereof. In some examples, transmitter 415 may be co-located with receiver 410 in a transceiver module. Transmitter 415 may utilize a single antenna or a set of multiple antennas.

[0100] The communication manager 420, the receiver 410, the transmitter 415, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the retransmission optimization mechanism as described herein. For example, the communication manager 420, the receiver 410, the transmitter 415, or various combinations thereof or components thereof may support methods for performing one or more of the functions described herein.

[0101] In some examples, the communication manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured as or otherwise supports means for performing the functions described in the present disclosure. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0102] Additionally or alternatively, in some examples, the communication manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting means for performing the functionality described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0103] In some examples, communication manager 420 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with receiver 410, transmitter 415, or both. For example, communication manager 420 may receive information from receiver 410, transmit information to transmitter 415, or be integrated in conjunction with receiver 410, transmitter 415, or both to obtain information, output information, or perform various other operations as described herein.

[0104] According to examples as disclosed herein, the communication manager 420 may support wireless communication at a first network node. For example, the communication manager 420 may be configured to or otherwise support a component for receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions. The communication manager 420 may be configured to or otherwise support a component for monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order. The communication manager 420 may be configured to or otherwise support a component for sending a request for the second network node to send future signals according to the second RV index order based on the monitoring.

[0105] By including or configuring the communication manager 420 according to the examples described herein, the device 405 (e.g., a processor controlling the receiver 410, the transmitter 415, the communication manager 420, or a combination thereof or otherwise coupled thereto) can support techniques for retransmission optimization mechanisms that can result in reduced processing, reduced power consumption, and more efficient utilization of communication resources), among other advantages.

[0106] Figure 5 A block diagram 500 of a device 505 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. The device 505 may be an example of aspects of the device 405 or a first network node (such as a UE 115 or a network entity 105) as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communication manager 520. The device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0107] Receiver 510 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to retransmission optimization mechanisms), user data, control information, or any combination thereof. The information may be communicated to other components of device 505. Receiver 510 may utilize a single antenna or a set of multiple antennas.

[0108] The transmitter 515 may provide means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to retransmission optimization mechanisms), user data, control information, or any combination thereof. In some examples, the transmitter 515 may be co-located with the receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a set of multiple antennas.

[0109] Device 505 or its various components may be examples of components for performing various aspects of the retransmission optimization mechanism as described herein. For example, communication manager 520 may include RV index order component 525, monitoring component 530, request component 535, or any combination thereof. Communication manager 520 may be an example of various aspects of communication manager 420 as described herein. In some examples, communication manager 520 or its various components may be configured to use or otherwise cooperate with receiver 510, transmitter 515, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, communication manager 520 may receive information from receiver 510, transmit information to transmitter 515, or be integrated with receiver 510, transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.

[0110] According to examples as disclosed herein, the communication manager 520 may support wireless communication at the first network node. The RV index order component 525 may be configured to or otherwise support a component for receiving one or more signals from the second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions. The monitoring component 530 may be configured to or otherwise support a component for monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order. The request component 535 may be configured to or otherwise support a component for sending a request for the second network node to send future signals according to the second RV index order based on the monitoring.

[0111] Figure 6A block diagram 600 of a communication manager 620 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. The communication manager 620 can be an example of aspects of the communication manager 420, the communication manager 520, or both as described herein. The communication manager 620 or its various components can be examples of components for performing various aspects of the retransmission optimization mechanism as described herein. For example, the communication manager 620 may include an RV index order component 625, a monitoring component 630, a request component 635, an error metric component 640, a decoding component 645, a feedback component 650, or any combination thereof. Each of these components can communicate with each other directly or indirectly (e.g., via one or more buses).

[0112] According to examples as disclosed herein, the communication manager 620 may support wireless communication at the first network node. The RV index order component 625 may be configured to or otherwise support a component for receiving one or more signals from the second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions. The monitoring component 630 may be configured to or otherwise support a component for monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order. The request component 635 may be configured to or otherwise support a component for sending a request for the second network node to send future signals according to the second RV index order based on the monitoring.

[0113] In some examples, to support monitoring an initial transmission and one or more retransmissions of each of the one or more signals, the monitoring component 630 may be configured to or otherwise support means for monitoring the initial transmission and one or more retransmissions of each of the one or more signals to determine a first error metric associated with a first RV index of a first RV index order and a second error metric associated with a second RV index of the first RV index order. In some examples, to support monitoring an initial transmission and one or more retransmissions of each of the one or more signals, the error metric component 640 may be configured to or otherwise support means for comparing a first error metric associated with a first RV index with a second error metric associated with a second RV index, wherein a request to send is based on the comparison.

[0114] In some examples, error metric component 640 can be configured or otherwise support means for determining that a first error metric associated with a first RV index is less than a second error metric associated with a second RV index, wherein sending the request is based on the determination.

[0115] In some examples, to support monitoring an initial transmission and one or more retransmissions of each of one or more signals, the monitoring component 630 may be configured to or otherwise support a component for monitoring an initial transmission and one or more retransmissions of each of the one or more signals during a duration associated with a timer to determine an error metric associated with each RV index of a first RV index order, wherein a request to transmit is based on expiration of the timer.

[0116] In some examples, to support receiving the one or more signals, the RV index order component 625 may be configured as or otherwise support components for receiving the one or more signals, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, wherein the first RV index order includes self-decodable RVs, non-self-decodable RVs, or both.

[0117] In some examples, the first RV index order includes an RV index order of 0, 2, 3, and then 1.

[0118] In some examples, to support sending the request, request component 635 can be configured or otherwise support means for sending a request for the second network node to send future signals according to a second RV index order, wherein the second RV index order includes self-decodable RVs.

[0119] In some examples, to support monitoring of an initial transmission and one or more retransmissions of each of one or more signals, the error metric component 640 may be configured as or otherwise support a component for measuring a block error rate of the initial transmission and one or more retransmissions, wherein the error metric associated with each RV index of a first RV index order is based on the measurement.

[0120] In some examples, RV index order component 625 can be configured or otherwise support means for receiving future signals according to a second RV index order.

[0121] In some examples, the second RV index order includes an RV index order of 0, 3, 0, then 3.

[0122] In some examples, to support sending the request, request component 635 may be configured or otherwise support means for sending a request via uplink control information or a medium access control-control element for the second network node to send future signals according to the second RV index order.

[0123] In some examples, the first network node communicates via NTN or using URLLC communications.

[0124] In some examples, the first RV index order is based on one or more parameters at the first network node.

[0125] In some examples, RV index order component 625 can be configured or otherwise support means for receiving a second control message indicating a first RV index order.

[0126] In some examples, decoding component 645 can be configured or otherwise support means for failing to decode an initial transmission. In some examples, feedback component 650 can be configured or otherwise support means for sending a feedback message including an indication that the first network node failed to decode the initial transmission, wherein receiving one or more retransmissions is based on the feedback message.

[0127] Figure 7 A diagram of a system 700 including a device 705 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. The device 705 may be an example of a device 405, a device 505, or a first network node (such as a UE 115 or a network entity 105) as described herein or include components of these devices. The device 705 may communicate (e.g., wirelessly) with one or more network nodes (such as one or more network entities 105, one or more UEs 115), or any combination thereof. The device 705 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 720, an input / output (I / O) controller 710, a transceiver 715, an antenna 725, a memory 730, a code 735, and a processor 740. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 745).

[0128] I / O controller 710 can manage input and output signals for device 705. I / O controller 710 can also manage peripheral devices that are not integrated into device 705. In some cases, I / O controller 710 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 710 can utilize an operating system such as or another known operating system. Additionally or alternatively, I / O controller 710 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 710 may be implemented as part of a processor such as processor 740. In some cases, a user may interact with device 705 via I / O controller 710 or via hardware components controlled by I / O controller 710.

[0129] In some cases, the device 705 may include a single antenna 725. However, in some other cases, the device 705 may have more than one antenna 725, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 715 may communicate bidirectionally via one or more antennas 725, a wired link, or a wireless link as described herein. For example, the transceiver 715 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 715 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 725 for transmission, and for demodulating packets received from one or more antennas 725. The transceiver 715, or the transceiver 715 and the one or more antennas 725 may be examples of transmitters 415, transmitters 515, receivers 410, receivers 510, or any combination thereof or any components thereof as described herein.

[0130] The memory 730 may include random access memory (RAM) and read-only memory (ROM). The memory 730 may store computer-readable, computer-executable code 735 including instructions that, when executed by the processor 740, cause the device 705 to perform various functions described herein. The code 735 may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some cases, the code 735 may not be directly executable by the processor 740, but may (e.g., when compiled and executed) cause the computer to perform the functions described herein. In some cases, the memory 730 may include, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0131] The processor 740 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 740 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 740. The processor 740 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 730) to enable the device 705 to perform various functions (e.g., various functions or tasks that support a retransmission optimization mechanism). For example, the device 705 or a component of the device 705 may include a processor 740 and a memory 730 coupled to or coupled to the processor 740, and the processor 740 and the memory 730 are configured to perform the various functions described herein.

[0132] According to examples as disclosed herein, the communication manager 720 may support wireless communication at a first network node. For example, the communication manager 720 may be configured to or otherwise support a component for receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions. The communication manager 720 may be configured to or otherwise support a component for monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order. The communication manager 720 may be configured to or otherwise support a component for sending a request for the second network node to send future signals according to the second RV index order based on the monitoring.

[0133] By including or configuring the communication manager 720 according to the examples described herein, the device 705 can support techniques for retransmission optimization mechanisms, which can result in improved communication reliability, reduced latency, an improved user experience associated with reduced processing, reduced power consumption, more efficient use of communication resources, improved coordination between devices, longer battery life, and improved use of processing power, among other advantages.

[0134] In some examples, the communication manager 720 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 715, one or more antennas 725, or any combination thereof. Although the communication manager 720 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 720 may be supported or performed by the processor 740, the memory 730, the code 735, or any combination thereof. For example, the code 735 may include instructions that may be executed by the processor 740 to cause the device 705 to perform various aspects of the retransmission optimization mechanism as described herein, or the processor 740 and the memory 730 may be otherwise configured to perform or support such operations.

[0135] Figure 8 A block diagram 800 of a device 805 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. The device 805 may be an example of aspects of a second network node (such as a network entity 105 or a UE 115) as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communication manager 820. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0136] The receiver 810 may provide means for obtaining (e.g., receiving, determining, identifying) information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). The information may be communicated to other components of the device 805. In some examples, the receiver 810 may support obtaining information by receiving signals via one or more antennas. Additionally or alternatively, the receiver 810 may support obtaining information by receiving signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof.

[0137] The transmitter 815 may provide means for outputting (e.g., sending, providing, conveying, transmitting) information generated by other components of the device 805. For example, the transmitter 815 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) (such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units)). In some examples, the transmitter 815 may support outputting information by sending signals via one or more antennas. Additionally or alternatively, the transmitter 815 may support outputting information by sending signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 815 and the receiver 810 may be co-located in a transceiver, which may include a modem or be coupled to a modem.

[0138] The communication manager 820, the receiver 810, the transmitter 815, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the retransmission optimization mechanism as described herein. For example, the communication manager 820, the receiver 810, the transmitter 815, or various combinations thereof or components thereof may support methods for performing one or more of the functions described herein.

[0139] In some examples, the communication manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a DSP, a CPU, an ASIC, an FPGA or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting means for performing the functions described in the present disclosure. In some examples, a processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0140] Additionally or alternatively, in some examples, the communication manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting means for performing the functionality described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0141] In some examples, the communication manager 820 can be configured to perform various operations (e.g., receive, obtain, monitor, output, send) using or otherwise cooperating with the receiver 810, the transmitter 815, or both. For example, the communication manager 820 can receive information from the receiver 810, transmit information to the transmitter 815, or integrate with the receiver 810, the transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.

[0142] The communication manager 820 may support wireless communication at a second network node according to the examples disclosed herein. For example, the communication manager 820 may be configured to or otherwise support means for sending one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions. The communication manager 820 may be configured to or otherwise support means for receiving a request from the second network node to send future signals according to a second RV index order. The communication manager 820 may be configured to or otherwise support means for sending future signals according to the second RV index order.

[0143] By including or configuring the communication manager 820 according to the examples described herein, the device 805 (e.g., a processor controlling the receiver 810, the transmitter 815, the communication manager 820, or a combination thereof or otherwise coupled thereto) can support techniques for retransmission optimization mechanisms that can result in reduced processing, reduced power consumption, and more efficient utilization of communication resources), among other advantages.

[0144] Fig. 9A block diagram 900 of a device 905 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. The device 905 may be an example of aspects of the device 805 or a second network node (such as a network entity 105 or a UE 115) as described herein. The device 905 may include a receiver 910, a transmitter 915, and a communication manager 920. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0145] The receiver 910 may provide means for obtaining (e.g., receiving, determining, identifying) information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack), such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units). The information may be communicated to other components of the device 905. In some examples, the receiver 910 may support obtaining information by receiving signals via one or more antennas. Additionally or alternatively, the receiver 910 may support obtaining information by receiving signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof.

[0146] The transmitter 915 may provide means for outputting (e.g., sending, providing, conveying, transmitting) information generated by other components of the device 905. For example, the transmitter 915 may output information associated with various channels (e.g., control channels, data channels, information channels, channels associated with a protocol stack) (such as user data, control information, or any combination thereof (e.g., I / Q samples, symbols, packets, protocol data units, service data units)). In some examples, the transmitter 915 may support outputting information by sending signals via one or more antennas. Additionally or alternatively, the transmitter 915 may support outputting information by sending signals via one or more wired (e.g., electrical, optical fiber) interfaces, wireless interfaces, or any combination thereof. In some examples, the transmitter 915 and the receiver 910 may be co-located in a transceiver, which may include a modem or be coupled to a modem.

[0147] Device 905 or its various components may be examples of components for performing various aspects of the retransmission optimization mechanism as described herein. For example, communication manager 920 may include RV index order component 925, request component 930, or any combination thereof. Communication manager 920 may be an example of various aspects of communication manager 820 as described herein. In some examples, communication manager 920 or its various components may be configured to use or otherwise cooperate with receiver 910, transmitter 915, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, communication manager 920 may receive information from receiver 910, transmit information to transmitter 915, or integrate with receiver 910, transmitter 915, or both to obtain information, output information, or perform various other operations as described herein.

[0148] The communication manager 920 may support wireless communication at a second network node according to examples as disclosed herein. The RV index order component 925 may be configured to or otherwise support means for sending one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for each of the initial transmission and the one or more retransmissions. The request component 930 may be configured to or otherwise support means for receiving a request from the second network node to send future signals according to a second RV index order. The RV index order component 925 may be configured to or otherwise support means for sending future signals according to the second RV index order.

[0149] Fig.10 A block diagram 1000 of a communication manager 1020 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. The communication manager 1020 may be an example of aspects of the communication manager 820, the communication manager 920, or both as described herein. The communication manager 1020 or its various components may be examples of means for performing various aspects of the retransmission optimization mechanism as described herein. For example, the communication manager 1020 may include an RV index order component 1025, a request component 1030, a feedback component 1035, or any combination thereof. Each of these components may communicate with each other directly or indirectly (e.g., via one or more buses), which communication may include communication within a protocol layer of a protocol stack, communication associated with a logical channel of a protocol stack (e.g., between protocol layers of a protocol stack, within a device, component, or virtualized component associated with a second network node (such as a network entity 105), between devices, components, or virtualized components associated with a second network node (such as a network entity 105), or any combination thereof.

[0150] The communication manager 1020 may support wireless communication at a second network node according to examples as disclosed herein. The RV index order component 1025 may be configured to or otherwise support means for sending one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions. The request component 1030 may be configured to or otherwise support means for receiving a request from the second network node to send future signals according to a second RV index order. In some examples, the RV index order component 1025 may be configured to or otherwise support means for sending future signals according to the second RV index order.

[0151] In some examples, to support sending the one or more signals, the RV index order component 1025 may be configured as or otherwise support components for sending the one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, wherein the first RV index order includes self-decodable RVs, non-self-decodable RVs, or both.

[0152] In some examples, the first RV index order includes an RV index order of 0, 2, 3, and then 1.

[0153] In some examples, to support receiving the request, requesting component 1030 can be configured or otherwise support means for receiving a request for a second network node to send future signals according to a second RV index order, wherein the second RV index order includes self-decodable RVs.

[0154] In some examples, the second RV index order includes an RV index order of 0, 3, 0, then 3.

[0155] In some examples, to support receiving the request, request component 1030 may be configured or otherwise support means for receiving a request via uplink control information or a medium access control-control element for the second network node to send future signals according to a second RV index order.

[0156] In some examples, the second network node communicates via the NTN or using URLLC communications.

[0157] In some examples, the first RV index order is based on one or more parameters at the first network node.

[0158] In some examples, RV index order component 1025 can be configured or otherwise support means for sending a second control message indicating the first RV index order.

[0159] In some examples, feedback component 1035 may be configured or otherwise support means for receiving a feedback message including an indication that the first network node failed to decode an initial transmission, wherein sending one or more retransmissions is based on the feedback message.

[0160] Fig.11 A diagram of a system 1100 including a device 1105 supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure is shown. The device 1105 may be an example of a device 805, a device 905, a second network node (such as a network entity 105 or a UE 115) as described herein, or a component including these devices. The device 1105 may communicate with one or more network nodes (such as one or more network entities 105, one or more UEs 115), or any combination thereof, which may include communication through one or more wired interfaces, through one or more wireless interfaces, or any combination thereof. The device 1105 may include components that support output and acquisition of communications, such as a communication manager 1120, a transceiver 1110, an antenna 1115, a memory 1125, a code 1130, and a processor 1135. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 1140).

[0161] The transceiver 1110 may support bidirectional communication via a wired link, a wireless link, or both as described herein. In some examples, the transceiver 1110 may include a wired transceiver and may communicate bidirectionally with another wired transceiver. Additionally or alternatively, in some examples, the transceiver 1110 may include a wireless transceiver and may communicate bidirectionally with another wireless transceiver. In some examples, the device 1105 may include one or more antennas 1115, which may be capable of (e.g., concurrently) sending or receiving wireless transmissions. The transceiver 1110 may also include a modem for modulating a signal, for providing a modulated signal for transmission (e.g., via one or more antennas 1115, via a wired transmitter), for receiving a modulated signal (e.g., from one or more antennas 1115, from a wired receiver), and for demodulating a signal. Where applicable, transceiver 1110 or transceiver 1110 and one or more antennas 1115 or wired interfaces may be examples of transmitter 815, transmitter 915, receiver 810, receiver 910, or any combination thereof or any components thereof as described herein. In some examples, the transceiver may be operable to support communication via one or more communication links (e.g., communication link 125, backhaul communication link 120, midhaul communication link 162, fronthaul communication link 168).

[0162] Memory 1125 may include RAM and ROM. Memory 1125 may store computer-readable, computer-executable code 1130 including instructions that, when executed by processor 1135, cause device 1105 to perform various functions described herein. Code 1130 may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, code 1130 may not be directly executable by processor 1135, but may (e.g., when compiled and executed) cause a computer to perform the functions described herein. In some cases, memory 1125 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0163] The processor 1135 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA, a microcontroller, a programmable logic device, a discrete gate or transistor logic, a discrete hardware component, or any combination thereof). In some cases, the processor 1135 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 1135. The processor 1135 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 1125) to enable the device 1105 to perform various functions (e.g., various functions or tasks that support a retransmission optimization mechanism). For example, the device 1105 or a component of the device 1105 may include a processor 1135 and a memory 1125 coupled to the processor 1135, and the processor 1135 and the memory 1125 are configured to perform various functions described herein. The processor 1135 may be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as an operating system, a virtual machine, or a container instance), which may host functions (e.g., by executing code 1130) to perform the functions of the device 1105.

[0164] In some examples, bus 1140 may support communications of a protocol layer of a protocol stack (e.g., within the protocol layer). In some examples, bus 1140 may support communications associated with a logical channel of a protocol stack (e.g., between protocol layers of the protocol stack), which may include communications performed within a component of device 1105 or between different components of device 1105 that may be co-located or located in different locations (e.g., where device 1105 may refer to a system where one or more of communication manager 1120, transceiver 1110, memory 1125, code 1130, and processor 1135 may be located in one of the different components or divided between the different components).

[0165] In some examples, the communication manager 1120 may manage aspects of communications with the core network 130 (e.g., via one or more wired or wireless backhaul links). For example, the communication manager 1120 may manage the delivery of data communications for client devices, such as one or more network nodes, such as one or more UEs 115. In some examples, the communication manager 1120 may manage communications with other network nodes, such as the network entity 105, and may include a controller or scheduler for controlling communications with network nodes, such as the UE 115, in coordination with other network nodes, such as the network entity 105. In some examples, the communication manager 1120 may support an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between network nodes.

[0166] The communication manager 1120 may support wireless communication at a second network node according to the examples disclosed herein. For example, the communication manager 1120 may be configured to or otherwise support a means for sending one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions. The communication manager 1120 may be configured to or otherwise support a means for receiving a request from the second network node to send future signals according to a second RV index order. The communication manager 1120 may be configured to or otherwise support a means for sending future signals according to the second RV index order.

[0167] By including or configuring the communication manager 1120 according to the examples described herein, the device 1105 can support techniques for retransmission optimization mechanisms, which can result in improved communication reliability, reduced latency, an improved user experience associated with reduced processing, reduced power consumption, more efficient use of communication resources, improved coordination between devices, longer battery life, and improved use of processing power, among other advantages.

[0168] In some examples, the communication manager 1120 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with the transceiver 1110, one or more antennas 1115 (e.g., where applicable), or any combination thereof. Although the communication manager 1120 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1120 may be supported or performed by the processor 1135, the memory 1125, the code 1130, the transceiver 1110, or any combination thereof. For example, the code 1130 may include instructions that are executable by the processor 1135 to cause the device 1105 to perform various aspects of the retransmission optimization mechanism as described herein, or the processor 1135 and the memory 1125 may be otherwise configured to perform or support such operations.

[0169] Fig.12 1 is a flowchart illustrating a method 1200 for supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure. The operations of the method 1200 may be implemented by a first network node or a component thereof as described herein. For example, the operations of the method 1200 may be implemented by a first network node or a component thereof as described herein. Figures 1 to 7 The first network node (such as UE 115 or network entity 105) may be used to perform the functions. In some examples, the first network node may execute an instruction set to control a functional element of the first network node to perform the functions. Additionally or alternatively, the first network node may use dedicated hardware to perform various aspects of the functions.

[0170] At 1205, the method may include: receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for each of the initial transmission and the one or more retransmissions. The operations of 1205 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed as described in reference to Figure 6 The RV index order component 625 is executed.

[0171] At 1210, the method may include monitoring an initial transmission and one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order. The operations of 1210 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1210 may be performed as described in reference to Figure 6 The monitoring component 630 is used to perform the above operation.

[0172] At 1215, the method may include: based on the monitoring, sending a request for the second network node to send future signals according to the second RV index order. The operations of 1215 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1215 may be performed as described in reference to Figure 6 The request component 635 is used for execution.

[0173] Fig.13 1 is a flowchart illustrating a method 1300 for supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure. The operations of the method 1300 may be implemented by a first network node or a component thereof as described herein. For example, the operations of the method 1300 may be implemented by a first network node or a component thereof as described herein. Figures 1 to 7 The first network node 115 may perform the functions. In some examples, the first network node may execute an instruction set to control a functional element of the first network node to perform the functions. Additionally or alternatively, the first network node may use dedicated hardware to perform various aspects of the functions.

[0174] At 1305, the method may include: receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a respective RV index for each of the initial transmission and the one or more retransmissions. The operations of 1305 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed as described in reference to Figure 6 The RV index order component 625 is executed.

[0175] At 1310, the method may include monitoring an initial transmission and one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order. The operations of 1310 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1310 may be performed as described in reference to Figure 6 The monitoring component 630 is used to perform the above operation.

[0176] At 1315, the method may include: based on the monitoring, sending a request for the second network node to send future signals according to the second RV index order. The operations of 1315 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1315 may be performed as described in reference to Figure 6 The request component 635 is used for execution.

[0177] At 1320, the method may include receiving the future signal according to the second RV index order. The operations of 1320 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1320 may be performed as described in reference to Figure 6The RV index order component 625 is executed.

[0178] Fig.14 1400 is a flowchart illustrating a method 1400 for supporting a retransmission optimization mechanism according to one or more aspects of the present disclosure. The operations of the method 1400 may be implemented by a second network node or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a second network node or a component thereof as described herein. Figures 1 to 3 and Figures 8 to 11 The second network node may execute the functions described. In some examples, the second network node may execute an instruction set to control a functional element of the second network node to perform the functions. Additionally or alternatively, the second network node may use dedicated hardware to perform various aspects of the functions described.

[0179] At 1405, the method may include: sending one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for each of the initial transmission and the one or more retransmissions. The operations of 1405 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Fig.10 The RV index order component 1025 is executed.

[0180] At 1410, the method may include receiving a request from a second network node to send future signals in accordance with a second RV index order. The operations of 1410 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1410 may be performed as described in reference to Fig.10 The request component 1030 is executed.

[0181] At 1415, the method may include: sending future signals according to the second RV index order. The operations of 1415 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1415 may be performed as described in reference to Fig.10 The RV index order component 1025 is executed.

[0182] The following provides an overview of various aspects of the disclosure:

[0183] Aspect 1: A method for wireless communication at a first network node, the method comprising: receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding redundant version index for the initial transmission and each of the one or more retransmissions; monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each RV index of the first RV index order; and sending a request for the second network node to send future signals according to a second RV index order based at least in part on the monitoring.

[0184] Aspect 2: A method according to Aspect 1, wherein monitoring the initial transmission and the one or more retransmissions of each of the one or more signals includes: monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine a first error metric associated with a first RV index of the first RV index sequence and a second error metric associated with a second RV index of the first RV index sequence; and comparing the first error metric associated with the first RV index and the second error metric associated with the second RV index, wherein sending the request is based at least in part on the comparison.

[0185] Aspect 3: According to the method of aspect 2, the method also includes: determining that the first error metric associated with the first RV index is less than the second error metric associated with the second RV index, wherein sending the request is at least partially based on the determination.

[0186] Aspect 4: A method according to any one of Aspects 1 to 3, wherein monitoring the initial transmission and the one or more retransmissions of each of the one or more signals includes: monitoring the initial transmission and the one or more retransmissions of each of the one or more signals during a duration associated with a timer to determine an error metric associated with each RV index of the first RV index order, wherein sending the request is at least partially based on expiration of the timer.

[0187] Aspect 5: A method according to any one of Aspects 1 to 4, wherein receiving the one or more signals includes: receiving the one or more signals, each of the one or more signals is received as the initial transmission and as the one or more retransmissions according to the first RV index order, wherein the first RV index order includes self-decodable RV, non-self-decodable RV, or both.

[0188] Aspect 6: The method according to aspect 5, wherein the first RV index order includes an RV index order of 0, 2, 3 and then 1.

[0189] Aspect 7: The method according to any one of aspects 1 to 6, wherein sending the request comprises: sending the request for the second network node to send the future signal according to the second RV index order, wherein the second RV index order includes self-decodable RVs.

[0190] Aspect 8: A method according to any one of Aspects 1 to 7, wherein monitoring the initial transmission and the one or more retransmissions of each of the one or more signals further comprises: measuring the BLER of the initial transmission and the one or more retransmissions, wherein the error metric associated with each RV index of the first RV index order is at least partially based on the measurement.

[0191] Aspect 9: According to the method according to any one of aspects 1 to 8, the method further includes: receiving the future signal according to the second RV index order.

[0192] Aspect 10: The method according to aspect 9, wherein the second RV index order comprises an RV index order of 0, 3, 0, and then 3.

[0193] Aspect 11: The method according to any one of Aspects 1 to 10, wherein sending the request comprises: sending the request for the second network node to send the future signal according to the second RV index order via uplink control information or medium access control-control element.

[0194] Aspect 12: The method according to any one of aspects 1 to 11, wherein the first network node communicates via a non-terrestrial network or using ultra-low reliability low latency communication.

[0195] Aspect 13: The method according to any one of aspects 1 to 12, wherein the first RV index order is based at least in part on one or more parameters at the first network node.

[0196] Aspect 14: According to the method of any one of Aspects 1 to 12, the method further includes: receiving a second control message indicating the first RV index order.

[0197] Aspect 15: According to the method described in any one of Aspects 1 to 14, the method also includes: failing to decode the initial transmission; and sending a feedback message including an indication that the first network node failed to decode the initial transmission, wherein receiving the one or more retransmissions is at least partially based on the feedback message.

[0198] Aspect 16: A method for performing wireless communication at a second network node, the method comprising: sending one or more signals, each of the one or more signals being sent as an initial transmission and as one or more retransmissions according to a first RV index order, the first RV index order specifying a corresponding RV index for the initial transmission and each of the one or more retransmissions; receiving a request from the second network node to send a future signal according to a second RV index order; and sending the future signal according to the second RV index order.

[0199] Aspect 17: A method according to Aspect 16, wherein sending the one or more signals includes: sending the one or more signals, each of the one or more signals is sent as the initial transmission and as the one or more retransmissions according to the first RV index order, wherein the first RV index order includes self-decodable RV, non-self-decodable RV, or both.

[0200] Aspect 18: The method according to Aspect 17, wherein the first RV index order comprises an RV index order of 0, 2, 3 and then 1.

[0201] Aspect 19: The method according to any one of aspects 16 to 18, wherein receiving the request comprises: receiving the request for the second network node to send the future signal according to the second RV index order, wherein the second RV index order includes self-decodable RVs.

[0202] Aspect 20: A method according to any one of Aspects 16 to 19, wherein the second RV index order comprises an RV index order of 0, 3, 0, and then 3.

[0203] Aspect 21: A method according to any one of Aspects 16 to 20, wherein receiving the request comprises: receiving the request for the second network node to send the future signal according to the second RV index order via uplink control information or medium access control-control element.

[0204] Aspect 22: The method according to any one of aspects 16 to 21, wherein the second network node communicates via a non-terrestrial network or using ultra-low reliability low latency communication.

[0205] Aspect 23: The method according to any one of aspects 16 to 22, wherein the first RV index order is based at least in part on one or more parameters at the first network node.

[0206] Aspect 24: According to the method of any one of Aspects 16 to 22, the method further comprises: sending a second control message indicating the first RV index order.

[0207] Aspect 25: The method according to any one of aspects 16 to 24, the method further comprising: receiving a feedback message including an indication that the first network node failed to decode the initial transmission, wherein sending the one or more retransmissions is at least partly based on the feedback message.

[0208] Aspect 26: A device comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the device to perform a method according to any one of Aspects 1 to 15.

[0209] Aspect 27: An apparatus comprising at least one means for performing the method according to any one of aspects 1 to 15.

[0210] Aspect 28: A non-transitory computer-readable medium storing code, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 15.

[0211] Aspect 29: An apparatus for wireless communication at a second network node, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 16 to 25.

[0212] Aspect 30: An apparatus for wireless communication at a second network node, the apparatus comprising at least one means for performing a method according to any one of aspects 16 to 25.

[0213] Aspect 31: A non-transitory computer-readable medium storing code for wireless communication at a second network node, the code comprising instructions executable by a processor to perform a method according to any one of aspects 16 to 25.

[0214] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0215] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0216] The information and signals described herein may be represented using any of a variety of different technologies and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0217] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration).

[0218] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium, or sent via a computer-readable medium. Other examples and specific implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these items. Features that implement the functions may also be physically located at different locations, including being distributed so that the functions are implemented at different physical locations.

[0219] Computer-readable medium includes both non-transient computer storage medium and communication medium, including any medium that facilitates computer program to be transmitted from one place to another.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.In an example and not limiting manner, non-transient computer-readable medium may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device, or can be used to carry or store desired program code components and can be accessed by general or special-purpose computer or general or special-purpose processor in the form of instruction or data structure Any other non-transient medium.Moreover, any connection is appropriately referred to as computer-readable medium.For example, if software is sent from website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0220] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0221] The term "determining" encompasses a variety of actions, and thus, "determining" may include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, database, or other data structure), ascertaining, etc. Additionally, "determining" may include receiving (such as receiving information), accessing (such as accessing data in a memory), and similar actions. Additionally, "determining" may include resolving, obtaining, selecting, choosing, establishing, and other such similar actions.

[0222] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between similar components. If only the first reference label is used in the specification, the description may apply to any of the similar components having the same first reference label regardless of the second reference label, or other subsequent reference labels.

[0223] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "having advantages over other examples." The specific embodiments include specific details to provide an understanding of the described technology. However, these technologies may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0224] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first network node, the method comprising: receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first redundancy version index order, the first redundancy version index order specifying a respective redundancy version index for each of the initial transmission and the one or more retransmissions; monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each redundancy version index of the first redundancy version index order; as well as Based at least in part on the monitoring, a request is sent for the second network node to send future signals in accordance with a second redundancy version index order.

2. The method of claim 1 , wherein monitoring the initial transmission and the one or more retransmissions of each of the one or more signals comprises: monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine a first error metric associated with a first redundancy version index of the first redundancy version index order and a second error metric associated with a second redundancy version index of the first redundancy version index order; as well as The first error metric associated with the first redundancy version index and the second error metric associated with the second redundancy version index are compared, wherein sending the request is based at least in part on the comparison.

3. The method according to claim 2, further comprising: Determining that the first error metric associated with the first redundancy version index is less than the second error metric associated with the second redundancy version index, wherein sending the request is based at least in part on the determination.

4. The method of claim 1 , wherein monitoring the initial transmission and the one or more retransmissions of each of the one or more signals comprises: The initial transmission and the one or more retransmissions of each of the one or more signals are monitored during a duration associated with a timer to determine an error metric associated with each redundancy version index of the first redundancy version index order, wherein sending the request is based at least in part on expiration of the timer.

5. The method of claim 1 , wherein receiving the one or more signals comprises: The one or more signals are received, each of the one or more signals being received as the initial transmission and as the one or more retransmissions according to the first redundancy version index order, wherein the first redundancy version index order includes self-decodable redundancy versions, non-self-decodable redundancy versions, or both. 6 . The method of claim 5 , wherein the first redundancy version index order comprises a redundancy version index order of 0, 2, 3, and then 1. 7 .

7. The method of claim 1 , wherein sending the request comprises: Sending the request for the second network node to send the future signal according to the second redundancy version index order, wherein the second redundancy version index order includes self-decodable redundancy versions.

8. The method of claim 1 , wherein monitoring the initial transmission and the one or more retransmissions of each of the one or more signals further comprises: A block error rate of the initial transmission and the one or more retransmissions is measured, wherein an error metric associated with each redundancy version index of the first redundancy version index sequence is based at least in part on the measurement.

9. The method according to claim 1, further comprising: The future signals are received in sequence according to the second redundancy version index. 10 . The method of claim 9 , wherein the second redundancy version index order comprises a redundancy version index order of 0, 3, 0, and then 3.

11. The method of claim 1 , wherein sending the request comprises: The request for the second network node to send the future signals in accordance with the second redundancy version index order is sent via uplink control information or a medium access control-control element.

12. The method of claim 1, wherein the first network node communicates via a non-terrestrial network or using ultra-low reliability low latency communications.

13. The method of claim 1, wherein the first redundancy version index order is based at least in part on one or more parameters at the first network node.

14. The method according to claim 1, further comprising: A second control message indicating the first redundancy version index order is received.

15. The method according to claim 1, further comprising: Failure to decode said initial transmission; as well as A feedback message is sent including an indication that the first network node failed to decode the initial transmission, wherein receiving the one or more retransmissions is based at least in part on the feedback message.

16. A method for wireless communication at a second network node, the method comprising: transmitting one or more signals, each of the one or more signals being transmitted as an initial transmission and as one or more retransmissions according to a first redundancy version index order, the first redundancy version index order specifying a respective redundancy version index for the initial transmission and each of the one or more retransmissions; receiving a request from the second network node to send future signals in accordance with a second redundancy version index order; and The future signals are sent according to the second redundancy version index order.

17. The method of claim 16, wherein sending the one or more signals comprises: The one or more signals are transmitted, each of the one or more signals being transmitted as the initial transmission and as the one or more retransmissions according to the first redundancy version index order, wherein the first redundancy version index order includes self-decodable redundancy versions, non-self-decodable redundancy versions, or both.

18. The method of claim 17, wherein the first redundancy version index order comprises a redundancy version index order of 0, 2, 3, and then 1.

19. The method of claim 16, wherein receiving the request comprises: The request is received for the second network node to send the future signal according to the second redundancy version index order, wherein the second redundancy version index order includes self-decodable redundancy versions.

20. The method of claim 16, wherein the second redundancy version index order comprises a redundancy version index order of 0, 3, 0, then 3.

21. The method of claim 16, wherein receiving the request comprises: The request for the second network node to send the future signals according to the second redundancy version index order is received via an uplink control message or a medium access control-control element.

22. The method of claim 16, wherein the second network node communicates via a non-terrestrial network or using ultra-low reliability low latency communications.

23. The method of claim 16, wherein the first redundancy version index order is based at least in part on one or more parameters at the first network node.

24. The method according to claim 16, further comprising: Sending a second control message indicating the first redundancy version index order.

25. The method according to claim 16, further comprising: A feedback message is received including an indication that the first network node failed to decode the initial transmission, wherein sending the one or more retransmissions is based at least in part on the feedback message.

26. An apparatus for wireless communication at a first network node, the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receiving one or more signals from a second network node, each of the one or more signals being received as an initial transmission and as one or more retransmissions according to a first redundancy version index order, the first redundancy version index order specifying a respective redundancy version index for each of the initial transmission and the one or more retransmissions; monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine an error metric associated with each redundancy version index of the first redundancy version index order; as well as Based at least in part on the monitoring, a request is sent for the second network node to send future signals in accordance with a second redundancy version index order.

27. The apparatus of claim 26, wherein the instructions for monitoring the initial transmission and the one or more retransmissions of each of the one or more signals are executable by the processor to cause the apparatus to: monitoring the initial transmission and the one or more retransmissions of each of the one or more signals to determine a first error metric associated with a first redundancy version index of the first redundancy version index order and a second error metric associated with a second redundancy version index of the first redundancy version index order; and The first error metric associated with the first redundancy version index and the second error metric associated with the second redundancy version index are compared, wherein sending the request is based at least in part on the comparison.

28. The apparatus of claim 26, wherein the instructions for monitoring the initial transmission and the one or more retransmissions of each of the one or more signals are executable by the processor to cause the apparatus to: The initial transmission and the one or more retransmissions of each of the one or more signals are monitored during a duration associated with a timer to determine an error metric associated with each redundancy version index of the first redundancy version index order, wherein sending the request is based at least in part on expiration of the timer.

29. The apparatus of claim 26, wherein the instructions are further executable by the processor to cause the apparatus to: The future signals are received in sequence according to the second redundancy version index.

30. An apparatus for wireless communication at a second network node, the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmitting one or more signals, each of the one or more signals being transmitted as an initial transmission and as one or more retransmissions according to a first redundancy version index order, the first redundancy version index order specifying a respective redundancy version index for the initial transmission and each of the one or more retransmissions; receiving a request from the second network node to send future signals in accordance with a second redundancy version index order; and The future signals are sent according to the second redundancy version index order.

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